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[linux.git] / net / ipv6 / addrconf.c
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2874c5fd 1// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4
LT		 2/*
3 * IPv6 Address [auto]configuration
4 * Linux INET6 implementation
5 *
6 * Authors:
1ab1457c 7 * Pedro Roque <[email protected]>
1da177e4 8 * Alexey Kuznetsov <[email protected]>
1da177e4
LT		 9 */
10
11/*
12 * Changes:
13 *
14 * Janos Farkas : delete timer on ifdown
15 * <[email protected]>
16 * Andi Kleen : kill double kfree on module
17 * unload.
18 * Maciej W. Rozycki : FDDI support
19 * sekiya@USAGI : Don't send too many RS
20 * packets.
21 * yoshfuji@USAGI : Fixed interval between DAD
22 * packets.
23 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
24 * address validation timer.
25 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
26 * support.
27 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
28 * address on a same interface.
29 * YOSHIFUJI Hideaki @USAGI : ARCnet support
30 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
31 * seq_file.
b1cacb68
YH		 32 * YOSHIFUJI Hideaki @USAGI : improved source address
33 * selection; consider scope,
34 * status etc.
1da177e4
LT		 35 */
36
f3213831
JP		 37#define pr_fmt(fmt) "IPv6: " fmt
38
1da177e4
LT		 39#include <linux/errno.h>
40#include <linux/types.h>
a0bffffc 41#include <linux/kernel.h>
174cd4b1 42#include <linux/sched/signal.h>
1da177e4
LT		 43#include <linux/socket.h>
44#include <linux/sockios.h>
1da177e4 45#include <linux/net.h>
3d1bec99 46#include <linux/inet.h>
1da177e4
LT		 47#include <linux/in6.h>
48#include <linux/netdevice.h>
1823730f 49#include <linux/if_addr.h>
1da177e4
LT		 50#include <linux/if_arp.h>
51#include <linux/if_arcnet.h>
52#include <linux/if_infiniband.h>
53#include <linux/route.h>
54#include <linux/inetdevice.h>
55#include <linux/init.h>
5a0e3ad6 56#include <linux/slab.h>
1da177e4
LT		 57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
4fc268d2 60#include <linux/capability.h>
1da177e4
LT		 61#include <linux/delay.h>
62#include <linux/notifier.h>
543537bd 63#include <linux/string.h>
ddbe5032 64#include <linux/hash.h>
1da177e4 65
457c4cbc 66#include <net/net_namespace.h>
1da177e4
LT		 67#include <net/sock.h>
68#include <net/snmp.h>
69
5241c2d7 70#include <net/6lowpan.h>
cb6bf355 71#include <net/firewire.h>
1da177e4
LT		 72#include <net/ipv6.h>
73#include <net/protocol.h>
74#include <net/ndisc.h>
75#include <net/ip6_route.h>
76#include <net/addrconf.h>
77#include <net/tcp.h>
78#include <net/ip.h>
5d620266 79#include <net/netlink.h>
f24e3d65 80#include <net/pkt_sched.h>
ca254490 81#include <net/l3mdev.h>
1da177e4
LT		 82#include <linux/if_tunnel.h>
83#include <linux/rtnetlink.h>
f3a1bfb1 84#include <linux/netconf.h>
1da177e4 85#include <linux/random.h>
e21e8467 86#include <linux/uaccess.h>
7f7d9a6b 87#include <asm/unaligned.h>
1da177e4
LT		 88
89#include <linux/proc_fs.h>
90#include <linux/seq_file.h>
bc3b2d7f 91#include <linux/export.h>
1da177e4 92
1da177e4 93#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e 94
3d1bec99
HFS		 95#define IPV6_MAX_STRLEN \
96 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
97
18a31e1e
TG		 98static inline u32 cstamp_delta(unsigned long cstamp)
99{
100 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
101}
1da177e4 102
bd11f074
MŻ		 103static inline s32 rfc3315_s14_backoff_init(s32 irt)
104{
105 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
106 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
107 do_div(tmp, 1000000);
108 return (s32)tmp;
109}
110
111static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
112{
113 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
114 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
115 do_div(tmp, 1000000);
116 if ((s32)tmp > mrt) {
117 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
118 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
119 do_div(tmp, 1000000);
120 }
121 return (s32)tmp;
122}
123
1da177e4 124#ifdef CONFIG_SYSCTL
a317a2f1 125static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 126static void addrconf_sysctl_unregister(struct inet6_dev *idev);
127#else
a317a2f1 128static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 129{
a317a2f1 130 return 0;
408c4768
PE		 131}
132
133static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
134{
135}
1da177e4
LT		 136#endif
137
9d6280da
JB		 138static void ipv6_regen_rndid(struct inet6_dev *idev);
139static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 140
1b34be74 141static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
d9bf82c2 142static int ipv6_count_addresses(const struct inet6_dev *idev);
622c81d5
HFS		 143static int ipv6_generate_stable_address(struct in6_addr *addr,
144 u8 dad_count,
145 const struct inet6_dev *idev);
1da177e4 146
27c565ae
ED		 147#define IN6_ADDR_HSIZE_SHIFT 8
148#define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
1da177e4
LT		 149/*
150 * Configured unicast address hash table
151 */
c2e21293 152static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 153static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 154
c15b1cca
HFS		 155static void addrconf_verify(void);
156static void addrconf_verify_rtnl(void);
157static void addrconf_verify_work(struct work_struct *);
1da177e4 158
c15b1cca
HFS		 159static struct workqueue_struct *addrconf_wq;
160static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 161
162static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
163static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
164
93d9b7d7
JP		 165static void addrconf_type_change(struct net_device *dev,
166 unsigned long event);
1da177e4
LT		 167static int addrconf_ifdown(struct net_device *dev, int how);
168
8d1c802b 169static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
21caa662
RK		 170 int plen,
171 const struct net_device *dev,
2b2450ca
DA		 172 u32 flags, u32 noflags,
173 bool no_gw);
21caa662 174
cf22f9a2 175static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 176static void addrconf_dad_work(struct work_struct *w);
c76fe2d9
DA		 177static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
178 bool send_na);
896585d4 179static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
e99e88a9 180static void addrconf_rs_timer(struct timer_list *t);
1da177e4
LT		 181static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
182static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
183
1ab1457c 184static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 185 struct prefix_info *pinfo);
1da177e4 186
888c848e 187static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 188 .forwarding = 0,
189 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
190 .mtu6 = IPV6_MIN_MTU,
191 .accept_ra = 1,
192 .accept_redirects = 1,
193 .autoconf = 1,
194 .force_mld_version = 0,
fc4eba58
HFS		 195 .mldv1_unsolicited_report_interval = 10 * HZ,
196 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 197 .dad_transmits = 1,
198 .rtr_solicits = MAX_RTR_SOLICITATIONS,
199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 200 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 201 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 202 .use_tempaddr = 0,
1da177e4
LT		 203 .temp_valid_lft = TEMP_VALID_LIFETIME,
204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
205 .regen_max_retry = REGEN_MAX_RETRY,
206 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 207 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 208 .accept_ra_defrtr = 1,
d9333196 209 .accept_ra_from_local = 0,
8013d1d7 210 .accept_ra_min_hop_limit= 1,
c4fd30eb 211 .accept_ra_pinfo = 1,
930d6ff2
YH		 212#ifdef CONFIG_IPV6_ROUTER_PREF
213 .accept_ra_rtr_pref = 1,
52e16356 214 .rtr_probe_interval = 60 * HZ,
09c884d4 215#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 216 .accept_ra_rt_info_min_plen = 0,
09c884d4
YH		 217 .accept_ra_rt_info_max_plen = 0,
218#endif
930d6ff2 219#endif
fbea49e1 220 .proxy_ndp = 0,
0bcbc926 221 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 222 .disable_ipv6 = 0,
09400953 223 .accept_dad = 0,
b800c3b9 224 .suppress_frag_ndisc = 1,
c2943f14 225 .accept_ra_mtu = 1,
3d1bec99
HFS		 226 .stable_secret = {
227 .initialized = false,
3985e8a3
EK		 228 },
229 .use_oif_addrs_only = 0,
35103d11 230 .ignore_routes_with_linkdown = 0,
f1705ec1 231 .keep_addr_on_down = 0,
1ababeba 232 .seg6_enabled = 0,
bf355b8d
DL		 233#ifdef CONFIG_IPV6_SEG6_HMAC
234 .seg6_require_hmac = 0,
235#endif
adc176c5 236 .enhanced_dad = 1,
d35a00b8 237 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
df789fe7 238 .disable_policy = 0,
1da177e4
LT		 239};
240
ab32ea5d 241static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 242 .forwarding = 0,
243 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
244 .mtu6 = IPV6_MIN_MTU,
245 .accept_ra = 1,
246 .accept_redirects = 1,
247 .autoconf = 1,
fc4eba58
HFS		 248 .force_mld_version = 0,
249 .mldv1_unsolicited_report_interval = 10 * HZ,
250 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 251 .dad_transmits = 1,
252 .rtr_solicits = MAX_RTR_SOLICITATIONS,
253 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 254 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 255 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 256 .use_tempaddr = 0,
257 .temp_valid_lft = TEMP_VALID_LIFETIME,
258 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
259 .regen_max_retry = REGEN_MAX_RETRY,
260 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 261 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 262 .accept_ra_defrtr = 1,
d9333196 263 .accept_ra_from_local = 0,
8013d1d7 264 .accept_ra_min_hop_limit= 1,
c4fd30eb 265 .accept_ra_pinfo = 1,
930d6ff2
YH		 266#ifdef CONFIG_IPV6_ROUTER_PREF
267 .accept_ra_rtr_pref = 1,
52e16356 268 .rtr_probe_interval = 60 * HZ,
09c884d4 269#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 270 .accept_ra_rt_info_min_plen = 0,
09c884d4
YH		 271 .accept_ra_rt_info_max_plen = 0,
272#endif
930d6ff2 273#endif
fbea49e1 274 .proxy_ndp = 0,
0bcbc926 275 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 276 .disable_ipv6 = 0,
1b34be74 277 .accept_dad = 1,
b800c3b9 278 .suppress_frag_ndisc = 1,
c2943f14 279 .accept_ra_mtu = 1,
3d1bec99
HFS		 280 .stable_secret = {
281 .initialized = false,
282 },
3985e8a3 283 .use_oif_addrs_only = 0,
35103d11 284 .ignore_routes_with_linkdown = 0,
f1705ec1 285 .keep_addr_on_down = 0,
1ababeba 286 .seg6_enabled = 0,
bf355b8d
DL		 287#ifdef CONFIG_IPV6_SEG6_HMAC
288 .seg6_require_hmac = 0,
289#endif
adc176c5 290 .enhanced_dad = 1,
d35a00b8 291 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
df789fe7 292 .disable_policy = 0,
1da177e4
LT		 293};
294
1f372c7b
MM		 295/* Check if link is ready: is it up and is a valid qdisc available */
296static inline bool addrconf_link_ready(const struct net_device *dev)
f24e3d65 297{
1f372c7b 298 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
f24e3d65
MC		 299}
300
b7b1bfce 301static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 302{
b7b1bfce
HFS		 303 if (del_timer(&idev->rs_timer))
304 __in6_dev_put(idev);
305}
306
c15b1cca 307static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 308{
c15b1cca 309 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 310 __in6_ifa_put(ifp);
311}
312
b7b1bfce
HFS		 313static void addrconf_mod_rs_timer(struct inet6_dev *idev,
314 unsigned long when)
315{
316 if (!timer_pending(&idev->rs_timer))
317 in6_dev_hold(idev);
318 mod_timer(&idev->rs_timer, jiffies + when);
319}
1da177e4 320
c15b1cca
HFS		 321static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
322 unsigned long delay)
1da177e4 323{
f8a894b2
XL		 324 in6_ifa_hold(ifp);
325 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
326 in6_ifa_put(ifp);
1da177e4
LT		 327}
328
7f7d9a6b
HX		 329static int snmp6_alloc_dev(struct inet6_dev *idev)
330{
827da44c
JS		 331 int i;
332
698365fa
WC		 333 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
334 if (!idev->stats.ipv6)
7f7d9a6b 335 goto err_ip;
827da44c
JS		 336
337 for_each_possible_cpu(i) {
338 struct ipstats_mib *addrconf_stats;
698365fa 339 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 340 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 341 }
342
343
be281e55
ED		 344 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
345 GFP_KERNEL);
346 if (!idev->stats.icmpv6dev)
7f7d9a6b 347 goto err_icmp;
be281e55
ED		 348 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
349 GFP_KERNEL);
350 if (!idev->stats.icmpv6msgdev)
14878f75 351 goto err_icmpmsg;
7f7d9a6b
HX		 352
353 return 0;
354
14878f75 355err_icmpmsg:
be281e55 356 kfree(idev->stats.icmpv6dev);
7f7d9a6b 357err_icmp:
698365fa 358 free_percpu(idev->stats.ipv6);
7f7d9a6b 359err_ip:
aaf70ec7 360 return -ENOMEM;
7f7d9a6b
HX		 361}
362
8e5e8f30 363static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 364{
365 struct inet6_dev *ndev;
a317a2f1 366 int err = -ENOMEM;
1da177e4
LT		 367
368 ASSERT_RTNL();
369
370 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 371 return ERR_PTR(-EINVAL);
1da177e4 372
1ab1457c 373 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
63159f29 374 if (!ndev)
a317a2f1 375 return ERR_PTR(err);
322f74a4
IO		 376
377 rwlock_init(&ndev->lock);
378 ndev->dev = dev;
502a2ffd 379 INIT_LIST_HEAD(&ndev->addr_list);
e99e88a9 380 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
c346dca1 381 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
9b29c696
HFS		 382
383 if (ndev->cnf.stable_secret.initialized)
d35a00b8 384 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
9b29c696 385
322f74a4 386 ndev->cnf.mtu6 = dev->mtu;
322f74a4 387 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
63159f29 388 if (!ndev->nd_parms) {
322f74a4 389 kfree(ndev);
a317a2f1 390 return ERR_PTR(err);
322f74a4 391 }
0187bdfb
BH		 392 if (ndev->cnf.forwarding)
393 dev_disable_lro(dev);
322f74a4
IO		 394 /* We refer to the device */
395 dev_hold(dev);
1da177e4 396
322f74a4 397 if (snmp6_alloc_dev(ndev) < 0) {
e32ac250
JP		 398 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
399 __func__);
322f74a4 400 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 401 dev_put(dev);
402 kfree(ndev);
a317a2f1 403 return ERR_PTR(err);
322f74a4 404 }
1da177e4 405
322f74a4 406 if (snmp6_register_dev(ndev) < 0) {
e32ac250
JP		 407 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
408 __func__, dev->name);
a317a2f1 409 goto err_release;
322f74a4
IO		 410 }
411
9d6280da 412 /* One reference from device. */
1be92460 413 refcount_set(&ndev->refcnt, 1);
1da177e4 414
1b34be74
YH		 415 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
416 ndev->cnf.accept_dad = -1;
417
07a93626 418#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 419 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 420 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 421 ndev->cnf.rtr_solicits = 0;
422 }
423#endif
424
372e6c8f 425 INIT_LIST_HEAD(&ndev->tempaddr_list);
76506a98 426 ndev->desync_factor = U32_MAX;
322f74a4
IO		 427 if ((dev->flags&IFF_LOOPBACK) ||
428 dev->type == ARPHRD_TUNNEL ||
9625ed72 429 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 430 dev->type == ARPHRD_SIT ||
0be669bb 431 dev->type == ARPHRD_NONE) {
322f74a4 432 ndev->cnf.use_tempaddr = -1;
9d6280da
JB		 433 } else
434 ipv6_regen_rndid(ndev);
5d9efa7e 435
914faa14 436 ndev->token = in6addr_any;
1da177e4 437
1f372c7b 438 if (netif_running(dev) && addrconf_link_ready(dev))
53aadcc9
HX		 439 ndev->if_flags |= IF_READY;
440
322f74a4
IO		 441 ipv6_mc_init_dev(ndev);
442 ndev->tstamp = jiffies;
a317a2f1
WC		 443 err = addrconf_sysctl_register(ndev);
444 if (err) {
445 ipv6_mc_destroy_dev(ndev);
2a189f9e 446 snmp6_unregister_dev(ndev);
a317a2f1
WC		 447 goto err_release;
448 }
30c4cf57 449 /* protected by rtnl_lock */
cf778b00 450 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 451
2c5e8933
HFS		 452 /* Join interface-local all-node multicast group */
453 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
454
d88ae4cc 455 /* Join all-node multicast group */
f3ee4010 456 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 457
d6ddef9e 458 /* Join all-router multicast group if forwarding is set */
8b2aaede 459 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 460 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
461
1da177e4 462 return ndev;
a317a2f1
WC		 463
464err_release:
465 neigh_parms_release(&nd_tbl, ndev->nd_parms);
466 ndev->dead = 1;
467 in6_dev_finish_destroy(ndev);
468 return ERR_PTR(err);
1da177e4
LT		 469}
470
8e5e8f30 471static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 472{
473 struct inet6_dev *idev;
474
475 ASSERT_RTNL();
476
e21e8467
SH		 477 idev = __in6_dev_get(dev);
478 if (!idev) {
479 idev = ipv6_add_dev(dev);
a317a2f1 480 if (IS_ERR(idev))
db0b99f5 481 return idev;
1da177e4 482 }
c5e33bdd 483
1da177e4
LT		 484 if (dev->flags&IFF_UP)
485 ipv6_mc_up(idev);
486 return idev;
487}
488
f3a1bfb1
ND		 489static int inet6_netconf_msgsize_devconf(int type)
490{
491 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
492 + nla_total_size(4); /* NETCONFA_IFINDEX */
136ba622 493 bool all = false;
f3a1bfb1 494
136ba622
ZS		 495 if (type == NETCONFA_ALL)
496 all = true;
497
498 if (all || type == NETCONFA_FORWARDING)
f3a1bfb1 499 size += nla_total_size(4);
b1afce95 500#ifdef CONFIG_IPV6_MROUTE
136ba622 501 if (all || type == NETCONFA_MC_FORWARDING)
d67b8c61 502 size += nla_total_size(4);
b1afce95 503#endif
136ba622 504 if (all || type == NETCONFA_PROXY_NEIGH)
c92d5491 505 size += nla_total_size(4);
f3a1bfb1 506
136ba622 507 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
35103d11
AG		 508 size += nla_total_size(4);
509
f3a1bfb1
ND		 510 return size;
511}
512
513static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
514 struct ipv6_devconf *devconf, u32 portid,
515 u32 seq, int event, unsigned int flags,
516 int type)
517{
518 struct nlmsghdr *nlh;
519 struct netconfmsg *ncm;
136ba622 520 bool all = false;
f3a1bfb1
ND		 521
522 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
523 flags);
63159f29 524 if (!nlh)
f3a1bfb1
ND		 525 return -EMSGSIZE;
526
136ba622
ZS		 527 if (type == NETCONFA_ALL)
528 all = true;
529
f3a1bfb1
ND		 530 ncm = nlmsg_data(nlh);
531 ncm->ncm_family = AF_INET6;
532
533 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
534 goto nla_put_failure;
535
23452170
DA		 536 if (!devconf)
537 goto out;
538
136ba622 539 if ((all || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 540 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
541 goto nla_put_failure;
b1afce95 542#ifdef CONFIG_IPV6_MROUTE
136ba622 543 if ((all || type == NETCONFA_MC_FORWARDING) &&
d67b8c61
ND		 544 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
545 devconf->mc_forwarding) < 0)
546 goto nla_put_failure;
b1afce95 547#endif
136ba622 548 if ((all || type == NETCONFA_PROXY_NEIGH) &&
c92d5491 549 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
550 goto nla_put_failure;
551
136ba622 552 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
35103d11
AG		 553 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
554 devconf->ignore_routes_with_linkdown) < 0)
555 goto nla_put_failure;
556
23452170 557out:
053c095a
JB		 558 nlmsg_end(skb, nlh);
559 return 0;
f3a1bfb1
ND		 560
561nla_put_failure:
562 nlmsg_cancel(skb, nlh);
563 return -EMSGSIZE;
564}
565
85b3daad
DA		 566void inet6_netconf_notify_devconf(struct net *net, int event, int type,
567 int ifindex, struct ipv6_devconf *devconf)
f3a1bfb1
ND		 568{
569 struct sk_buff *skb;
570 int err = -ENOBUFS;
571
927265bc 572 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
63159f29 573 if (!skb)
f3a1bfb1
ND		 574 goto errout;
575
576 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
85b3daad 577 event, 0, type);
f3a1bfb1
ND		 578 if (err < 0) {
579 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
580 WARN_ON(err == -EMSGSIZE);
581 kfree_skb(skb);
582 goto errout;
583 }
927265bc 584 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
f3a1bfb1
ND		 585 return;
586errout:
bd779028 587 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 588}
589
76f8f6cb
ND		 590static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
591 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
592 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 593 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
35103d11 594 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
76f8f6cb
ND		 595};
596
38d51810
JK		 597static int inet6_netconf_valid_get_req(struct sk_buff *skb,
598 const struct nlmsghdr *nlh,
599 struct nlattr **tb,
600 struct netlink_ext_ack *extack)
601{
602 int i, err;
603
604 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
605 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
606 return -EINVAL;
607 }
608
609 if (!netlink_strict_get_check(skb))
8cb08174
JB		 610 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
611 tb, NETCONFA_MAX,
612 devconf_ipv6_policy, extack);
38d51810 613
8cb08174
JB		 614 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
615 tb, NETCONFA_MAX,
616 devconf_ipv6_policy, extack);
38d51810
JK		 617 if (err)
618 return err;
619
620 for (i = 0; i <= NETCONFA_MAX; i++) {
621 if (!tb[i])
622 continue;
623
624 switch (i) {
625 case NETCONFA_IFINDEX:
626 break;
627 default:
628 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
629 return -EINVAL;
630 }
631 }
632
633 return 0;
634}
635
76f8f6cb 636static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
c21ef3e3
DA		 637 struct nlmsghdr *nlh,
638 struct netlink_ext_ack *extack)
76f8f6cb
ND		 639{
640 struct net *net = sock_net(in_skb->sk);
641 struct nlattr *tb[NETCONFA_MAX+1];
4ea2607f
FW		 642 struct inet6_dev *in6_dev = NULL;
643 struct net_device *dev = NULL;
76f8f6cb
ND		 644 struct sk_buff *skb;
645 struct ipv6_devconf *devconf;
76f8f6cb
ND		 646 int ifindex;
647 int err;
648
38d51810 649 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
76f8f6cb 650 if (err < 0)
4ea2607f 651 return err;
76f8f6cb 652
76f8f6cb 653 if (!tb[NETCONFA_IFINDEX])
4ea2607f 654 return -EINVAL;
76f8f6cb 655
4ea2607f 656 err = -EINVAL;
76f8f6cb
ND		 657 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
658 switch (ifindex) {
659 case NETCONFA_IFINDEX_ALL:
660 devconf = net->ipv6.devconf_all;
661 break;
662 case NETCONFA_IFINDEX_DEFAULT:
663 devconf = net->ipv6.devconf_dflt;
664 break;
665 default:
4ea2607f 666 dev = dev_get_by_index(net, ifindex);
63159f29 667 if (!dev)
4ea2607f
FW		 668 return -EINVAL;
669 in6_dev = in6_dev_get(dev);
63159f29 670 if (!in6_dev)
76f8f6cb
ND		 671 goto errout;
672 devconf = &in6_dev->cnf;
673 break;
674 }
675
676 err = -ENOBUFS;
4ea2607f 677 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
63159f29 678 if (!skb)
76f8f6cb
ND		 679 goto errout;
680
681 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
682 NETLINK_CB(in_skb).portid,
683 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
136ba622 684 NETCONFA_ALL);
76f8f6cb
ND		 685 if (err < 0) {
686 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
687 WARN_ON(err == -EMSGSIZE);
688 kfree_skb(skb);
689 goto errout;
690 }
691 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
692errout:
4ea2607f
FW		 693 if (in6_dev)
694 in6_dev_put(in6_dev);
695 if (dev)
696 dev_put(dev);
76f8f6cb
ND		 697 return err;
698}
699
7a674200
ND		 700static int inet6_netconf_dump_devconf(struct sk_buff *skb,
701 struct netlink_callback *cb)
702{
addd383f 703 const struct nlmsghdr *nlh = cb->nlh;
7a674200
ND		 704 struct net *net = sock_net(skb->sk);
705 int h, s_h;
706 int idx, s_idx;
707 struct net_device *dev;
708 struct inet6_dev *idev;
709 struct hlist_head *head;
710
addd383f
DA		 711 if (cb->strict_check) {
712 struct netlink_ext_ack *extack = cb->extack;
713 struct netconfmsg *ncm;
714
715 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
716 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
717 return -EINVAL;
718 }
719
720 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
721 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
722 return -EINVAL;
723 }
724 }
725
7a674200
ND		 726 s_h = cb->args[0];
727 s_idx = idx = cb->args[1];
728
729 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
730 idx = 0;
731 head = &net->dev_index_head[h];
732 rcu_read_lock();
63998ac2
ND		 733 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
734 net->dev_base_seq;
7a674200
ND		 735 hlist_for_each_entry_rcu(dev, head, index_hlist) {
736 if (idx < s_idx)
737 goto cont;
738 idev = __in6_dev_get(dev);
739 if (!idev)
740 goto cont;
741
742 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
743 &idev->cnf,
744 NETLINK_CB(cb->skb).portid,
addd383f 745 nlh->nlmsg_seq,
7a674200
ND		 746 RTM_NEWNETCONF,
747 NLM_F_MULTI,
136ba622 748 NETCONFA_ALL) < 0) {
7a674200
ND		 749 rcu_read_unlock();
750 goto done;
751 }
63998ac2 752 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 753cont:
754 idx++;
755 }
756 rcu_read_unlock();
757 }
758 if (h == NETDEV_HASHENTRIES) {
759 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
760 net->ipv6.devconf_all,
761 NETLINK_CB(cb->skb).portid,
addd383f 762 nlh->nlmsg_seq,
7a674200 763 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 764 NETCONFA_ALL) < 0)
7a674200
ND		 765 goto done;
766 else
767 h++;
768 }
769 if (h == NETDEV_HASHENTRIES + 1) {
770 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
771 net->ipv6.devconf_dflt,
772 NETLINK_CB(cb->skb).portid,
addd383f 773 nlh->nlmsg_seq,
7a674200 774 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 775 NETCONFA_ALL) < 0)
7a674200
ND		 776 goto done;
777 else
778 h++;
779 }
780done:
781 cb->args[0] = h;
782 cb->args[1] = idx;
783
784 return skb->len;
785}
786
1da177e4
LT		 787#ifdef CONFIG_SYSCTL
788static void dev_forward_change(struct inet6_dev *idev)
789{
790 struct net_device *dev;
791 struct inet6_ifaddr *ifa;
1da177e4
LT		 792
793 if (!idev)
794 return;
795 dev = idev->dev;
0187bdfb
BH		 796 if (idev->cnf.forwarding)
797 dev_disable_lro(dev);
1a940835 798 if (dev->flags & IFF_MULTICAST) {
2c5e8933 799 if (idev->cnf.forwarding) {
f3ee4010 800 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 801 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
802 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
803 } else {
f3ee4010 804 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 805 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
806 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
807 }
1da177e4 808 }
502a2ffd 809
810 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 811 if (ifa->flags&IFA_F_TENTATIVE)
812 continue;
1da177e4
LT		 813 if (idev->cnf.forwarding)
814 addrconf_join_anycast(ifa);
815 else
816 addrconf_leave_anycast(ifa);
817 }
85b3daad
DA		 818 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
819 NETCONFA_FORWARDING,
f3a1bfb1 820 dev->ifindex, &idev->cnf);
1da177e4
LT		 821}
822
823
e186932b 824static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 825{
826 struct net_device *dev;
827 struct inet6_dev *idev;
828
4acd4945 829 for_each_netdev(net, dev) {
1da177e4
LT		 830 idev = __in6_dev_get(dev);
831 if (idev) {
e186932b
PE		 832 int changed = (!idev->cnf.forwarding) ^ (!newf);
833 idev->cnf.forwarding = newf;
1da177e4
LT		 834 if (changed)
835 dev_forward_change(idev);
836 }
1da177e4 837 }
1da177e4 838}
c8fecf22 839
013d97e9 840static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 841{
bff16c2f 842 struct net *net;
013d97e9
FR		 843 int old;
844
845 if (!rtnl_trylock())
846 return restart_syscall();
bff16c2f
PE		 847
848 net = (struct net *)table->extra2;
013d97e9
FR		 849 old = *p;
850 *p = newf;
b325fddb 851
013d97e9 852 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1 853 if ((!newf) ^ (!old))
85b3daad
DA		 854 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
855 NETCONFA_FORWARDING,
f3a1bfb1
ND		 856 NETCONFA_IFINDEX_DEFAULT,
857 net->ipv6.devconf_dflt);
013d97e9
FR		 858 rtnl_unlock();
859 return 0;
88af182e 860 }
c8fecf22 861
e186932b 862 if (p == &net->ipv6.devconf_all->forwarding) {
d26c638c
ND		 863 int old_dflt = net->ipv6.devconf_dflt->forwarding;
864
e186932b 865 net->ipv6.devconf_dflt->forwarding = newf;
d26c638c 866 if ((!newf) ^ (!old_dflt))
85b3daad
DA		 867 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
868 NETCONFA_FORWARDING,
d26c638c
ND		 869 NETCONFA_IFINDEX_DEFAULT,
870 net->ipv6.devconf_dflt);
871
e186932b 872 addrconf_forward_change(net, newf);
f3a1bfb1 873 if ((!newf) ^ (!old))
85b3daad
DA		 874 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
875 NETCONFA_FORWARDING,
f3a1bfb1
ND		 876 NETCONFA_IFINDEX_ALL,
877 net->ipv6.devconf_all);
013d97e9 878 } else if ((!newf) ^ (!old))
c8fecf22 879 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 880 rtnl_unlock();
c8fecf22 881
013d97e9 882 if (newf)
7b4da532 883 rt6_purge_dflt_routers(net);
b325fddb 884 return 1;
c8fecf22 885}
35103d11
AG		 886
887static void addrconf_linkdown_change(struct net *net, __s32 newf)
888{
889 struct net_device *dev;
890 struct inet6_dev *idev;
891
892 for_each_netdev(net, dev) {
893 idev = __in6_dev_get(dev);
894 if (idev) {
895 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
896
897 idev->cnf.ignore_routes_with_linkdown = newf;
898 if (changed)
899 inet6_netconf_notify_devconf(dev_net(dev),
85b3daad 900 RTM_NEWNETCONF,
35103d11
AG		 901 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
902 dev->ifindex,
903 &idev->cnf);
904 }
905 }
906}
907
908static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
909{
910 struct net *net;
911 int old;
912
913 if (!rtnl_trylock())
914 return restart_syscall();
915
916 net = (struct net *)table->extra2;
917 old = *p;
918 *p = newf;
919
920 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
921 if ((!newf) ^ (!old))
922 inet6_netconf_notify_devconf(net,
85b3daad 923 RTM_NEWNETCONF,
35103d11
AG		 924 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
925 NETCONFA_IFINDEX_DEFAULT,
926 net->ipv6.devconf_dflt);
927 rtnl_unlock();
928 return 0;
929 }
930
931 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
932 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
933 addrconf_linkdown_change(net, newf);
934 if ((!newf) ^ (!old))
935 inet6_netconf_notify_devconf(net,
85b3daad 936 RTM_NEWNETCONF,
35103d11
AG		 937 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
938 NETCONFA_IFINDEX_ALL,
939 net->ipv6.devconf_all);
940 }
941 rtnl_unlock();
942
943 return 1;
944}
945
1da177e4
LT		 946#endif
947
5c578aed 948/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 949void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
950{
c2e21293 951 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 952
1da177e4 953#ifdef NET_REFCNT_DEBUG
91df42be 954 pr_debug("%s\n", __func__);
1da177e4
LT		 955#endif
956
957 in6_dev_put(ifp->idev);
958
c15b1cca
HFS		 959 if (cancel_delayed_work(&ifp->dad_work))
960 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
961 ifp);
1da177e4 962
e9d3e084 963 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 964 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 965 return;
966 }
1da177e4 967
e5785985 968 kfree_rcu(ifp, rcu);
1da177e4
LT		 969}
970
e55ffac6
BH		 971static void
972ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
973{
502a2ffd 974 struct list_head *p;
8a6ce0c0 975 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 976
977 /*
978 * Each device address list is sorted in order of scope -
979 * global before linklocal.
980 */
502a2ffd 981 list_for_each(p, &idev->addr_list) {
982 struct inet6_ifaddr *ifa
983 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 984 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 985 break;
986 }
987
8ef802aa 988 list_add_tail_rcu(&ifp->if_list, p);
e55ffac6
BH		 989}
990
3f27fb23 991static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
3eb84f49 992{
3f27fb23
ED		 993 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
994
995 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 996}
997
56fc709b 998static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
752a9292 999 struct net_device *dev, unsigned int hash)
56fc709b 1000{
56fc709b
ED		 1001 struct inet6_ifaddr *ifp;
1002
1003 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1004 if (!net_eq(dev_net(ifp->idev->dev), net))
1005 continue;
1006 if (ipv6_addr_equal(&ifp->addr, addr)) {
1007 if (!dev || ifp->idev->dev == dev)
1008 return true;
1009 }
1010 }
1011 return false;
1012}
1013
f3d9832e
DA		 1014static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1015{
3f27fb23 1016 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
f3d9832e
DA		 1017 int err = 0;
1018
1019 spin_lock(&addrconf_hash_lock);
1020
1021 /* Ignore adding duplicate addresses on an interface */
752a9292 1022 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
e32ac250 1023 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
f3d9832e 1024 err = -EEXIST;
752a9292
ED		 1025 } else {
1026 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
f3d9832e
DA		 1027 }
1028
f3d9832e
DA		 1029 spin_unlock(&addrconf_hash_lock);
1030
1031 return err;
1032}
1033
1da177e4
LT		 1034/* On success it returns ifp with increased reference count */
1035
1036static struct inet6_ifaddr *
e6464b8c 1037ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
de95e047 1038 bool can_block, struct netlink_ext_ack *extack)
1da177e4 1039{
f3d9832e 1040 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
e6464b8c 1041 int addr_type = ipv6_addr_type(cfg->pfx);
df789fe7 1042 struct net *net = dev_net(idev->dev);
1da177e4 1043 struct inet6_ifaddr *ifa = NULL;
360a9887 1044 struct fib6_info *f6i = NULL;
1da177e4 1045 int err = 0;
d68b8270
YH		 1046
1047 if (addr_type == IPV6_ADDR_ANY ||
f17f7648
HL		 1048 (addr_type & IPV6_ADDR_MULTICAST &&
1049 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) ||
d68b8270 1050 (!(idev->dev->flags & IFF_LOOPBACK) &&
3ede0bbc 1051 !netif_is_l3_master(idev->dev) &&
d68b8270
YH		 1052 addr_type & IPV6_ADDR_LOOPBACK))
1053 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 1054
1da177e4
LT		 1055 if (idev->dead) {
1056 err = -ENODEV; /*XXX*/
f3d9832e 1057 goto out;
1da177e4
LT		 1058 }
1059
56d417b1 1060 if (idev->cnf.disable_ipv6) {
9bdd8d40 1061 err = -EACCES;
f3d9832e 1062 goto out;
9bdd8d40
BH		 1063 }
1064
ff7883ea
DA		 1065 /* validator notifier needs to be blocking;
1066 * do not call in atomic context
1067 */
1068 if (can_block) {
1069 struct in6_validator_info i6vi = {
e6464b8c 1070 .i6vi_addr = *cfg->pfx,
ff7883ea 1071 .i6vi_dev = idev,
de95e047 1072 .extack = extack,
ff7883ea
DA		 1073 };
1074
1075 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1076 err = notifier_to_errno(err);
1077 if (err < 0)
1078 goto out;
1079 }
1da177e4 1080
f3d9832e 1081 ifa = kzalloc(sizeof(*ifa), gfp_flags);
63159f29 1082 if (!ifa) {
1da177e4
LT		 1083 err = -ENOBUFS;
1084 goto out;
1085 }
1086
e6464b8c 1087 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
360a9887
DA		 1088 if (IS_ERR(f6i)) {
1089 err = PTR_ERR(f6i);
1090 f6i = NULL;
1da177e4
LT		 1091 goto out;
1092 }
1093
df789fe7
DF		 1094 if (net->ipv6.devconf_all->disable_policy ||
1095 idev->cnf.disable_policy)
360a9887 1096 f6i->dst_nopolicy = true;
df789fe7 1097
bba24896
JP		 1098 neigh_parms_data_state_setall(idev->nd_parms);
1099
e6464b8c
DA		 1100 ifa->addr = *cfg->pfx;
1101 if (cfg->peer_pfx)
1102 ifa->peer_addr = *cfg->peer_pfx;
1da177e4
LT		 1103
1104 spin_lock_init(&ifa->lock);
c15b1cca 1105 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 1106 INIT_HLIST_NODE(&ifa->addr_lst);
e6464b8c
DA		 1107 ifa->scope = cfg->scope;
1108 ifa->prefix_len = cfg->plen;
8308f3ff 1109 ifa->rt_priority = cfg->rt_priority;
e6464b8c 1110 ifa->flags = cfg->ifa_flags;
66eb9f86 1111 /* No need to add the TENTATIVE flag for addresses with NODAD */
e6464b8c 1112 if (!(cfg->ifa_flags & IFA_F_NODAD))
66eb9f86 1113 ifa->flags |= IFA_F_TENTATIVE;
e6464b8c
DA		 1114 ifa->valid_lft = cfg->valid_lft;
1115 ifa->prefered_lft = cfg->preferred_lft;
1da177e4 1116 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 1117 ifa->tokenized = false;
1da177e4 1118
360a9887 1119 ifa->rt = f6i;
57f5f544 1120
1da177e4 1121 ifa->idev = idev;
f3d9832e
DA		 1122 in6_dev_hold(idev);
1123
1da177e4 1124 /* For caller */
271201c0 1125 refcount_set(&ifa->refcnt, 1);
1da177e4 1126
f3d9832e 1127 rcu_read_lock_bh();
1da177e4 1128
f3d9832e
DA		 1129 err = ipv6_add_addr_hash(idev->dev, ifa);
1130 if (err < 0) {
1131 rcu_read_unlock_bh();
1132 goto out;
1133 }
1da177e4
LT		 1134
1135 write_lock(&idev->lock);
f3d9832e 1136
1da177e4 1137 /* Add to inet6_dev unicast addr list. */
e55ffac6 1138 ipv6_link_dev_addr(idev, ifa);
1da177e4 1139
1da177e4 1140 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 1141 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 1142 in6_ifa_hold(ifa);
1143 }
1da177e4 1144
1da177e4
LT		 1145 in6_ifa_hold(ifa);
1146 write_unlock(&idev->lock);
f3d9832e 1147
8814c4b5 1148 rcu_read_unlock_bh();
1da177e4 1149
f3d9832e
DA		 1150 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1151out:
1152 if (unlikely(err < 0)) {
360a9887 1153 fib6_info_release(f6i);
93531c67 1154
f3d9832e
DA		 1155 if (ifa) {
1156 if (ifa->idev)
1157 in6_dev_put(ifa->idev);
1158 kfree(ifa);
1159 }
1da177e4
LT		 1160 ifa = ERR_PTR(err);
1161 }
1162
1163 return ifa;
1da177e4
LT		 1164}
1165
5b84efec
TH		 1166enum cleanup_prefix_rt_t {
1167 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1168 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1169 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1170};
1171
1172/*
1173 * Check, whether the prefix for ifp would still need a prefix route
1174 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1175 * constants.
1176 *
1177 * 1) we don't purge prefix if address was not permanent.
1178 * prefix is managed by its own lifetime.
1179 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1180 * 3) if there are no addresses, delete prefix.
1181 * 4) if there are still other permanent address(es),
1182 * corresponding prefix is still permanent.
1183 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1184 * don't purge the prefix, assume user space is managing it.
1185 * 6) otherwise, update prefix lifetime to the
1186 * longest valid lifetime among the corresponding
1187 * addresses on the device.
1188 * Note: subsequent RA will update lifetime.
1189 **/
1190static enum cleanup_prefix_rt_t
1191check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1192{
1193 struct inet6_ifaddr *ifa;
1194 struct inet6_dev *idev = ifp->idev;
1195 unsigned long lifetime;
1196 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1197
1198 *expires = jiffies;
1199
1200 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1201 if (ifa == ifp)
1202 continue;
e75913c9
ZL		 1203 if (ifa->prefix_len != ifp->prefix_len ||
1204 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
5b84efec
TH		 1205 ifp->prefix_len))
1206 continue;
1207 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1208 return CLEANUP_PREFIX_RT_NOP;
1209
1210 action = CLEANUP_PREFIX_RT_EXPIRE;
1211
1212 spin_lock(&ifa->lock);
1213
1214 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1215 /*
1216 * Note: Because this address is
1217 * not permanent, lifetime <
1218 * LONG_MAX / HZ here.
1219 */
1220 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1221 *expires = ifa->tstamp + lifetime * HZ;
1222 spin_unlock(&ifa->lock);
1223 }
1224
1225 return action;
1226}
1227
1228static void
d0098e4c
HL		 1229cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1230 bool del_rt, bool del_peer)
5b84efec 1231{
93c2fb25 1232 struct fib6_info *f6i;
5b84efec 1233
d0098e4c
HL		 1234 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1235 ifp->prefix_len,
2b2450ca 1236 ifp->idev->dev, 0, RTF_DEFAULT, true);
93c2fb25 1237 if (f6i) {
5b84efec 1238 if (del_rt)
93c2fb25 1239 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
5b84efec 1240 else {
93c2fb25
DA		 1241 if (!(f6i->fib6_flags & RTF_EXPIRES))
1242 fib6_set_expires(f6i, expires);
1243 fib6_info_release(f6i);
5b84efec
TH		 1244 }
1245 }
1246}
1247
1248
1da177e4
LT		 1249/* This function wants to get referenced ifp and releases it before return */
1250
1251static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1252{
4c5ff6a6 1253 int state;
5b84efec
TH		 1254 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1255 unsigned long expires;
1da177e4 1256
c15b1cca
HFS		 1257 ASSERT_RTNL();
1258
8e8e676d 1259 spin_lock_bh(&ifp->lock);
4c5ff6a6 1260 state = ifp->state;
e9d3e084 1261 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1262 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1263
1264 if (state == INET6_IFADDR_STATE_DEAD)
1265 goto out;
1da177e4 1266
5c578aed 1267 spin_lock_bh(&addrconf_hash_lock);
1268 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1269 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1270
5b84efec 1271 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1272
1da177e4 1273 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1274 list_del(&ifp->tmp_list);
1275 if (ifp->ifpub) {
1276 in6_ifa_put(ifp->ifpub);
1277 ifp->ifpub = NULL;
1da177e4 1278 }
372e6c8f 1279 __in6_ifa_put(ifp);
1da177e4 1280 }
1da177e4 1281
5b84efec
TH		 1282 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1283 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1284
8ef802aa 1285 list_del_rcu(&ifp->if_list);
5b84efec
TH		 1286 __in6_ifa_put(ifp);
1287
1288 write_unlock_bh(&ifp->idev->lock);
1da177e4 1289
c15b1cca 1290 addrconf_del_dad_work(ifp);
b2238566 1291
1da177e4
LT		 1292 ipv6_ifa_notify(RTM_DELADDR, ifp);
1293
f88c91dd 1294 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1295
5b84efec
TH		 1296 if (action != CLEANUP_PREFIX_RT_NOP) {
1297 cleanup_prefix_route(ifp, expires,
d0098e4c 1298 action == CLEANUP_PREFIX_RT_DEL, false);
1da177e4
LT		 1299 }
1300
c3968a85
DW		 1301 /* clean up prefsrc entries */
1302 rt6_remove_prefsrc(ifp);
4c5ff6a6 1303out:
1da177e4
LT		 1304 in6_ifa_put(ifp);
1305}
1306
fffcefe9
ED		 1307static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp,
1308 struct inet6_ifaddr *ift,
1309 bool block)
1da177e4
LT		 1310{
1311 struct inet6_dev *idev = ifp->idev;
1312 struct in6_addr addr, *tmpaddr;
e6464b8c 1313 unsigned long tmp_tstamp, age;
eac55bf9 1314 unsigned long regen_advance;
e6464b8c 1315 struct ifa6_config cfg;
1da177e4 1316 int ret = 0;
76f793e3 1317 unsigned long now = jiffies;
76506a98 1318 long max_desync_factor;
7aa8e63f 1319 s32 cnf_temp_preferred_lft;
1da177e4 1320
53bd6749 1321 write_lock_bh(&idev->lock);
1da177e4
LT		 1322 if (ift) {
1323 spin_lock_bh(&ift->lock);
1324 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1325 spin_unlock_bh(&ift->lock);
1326 tmpaddr = &addr;
1327 } else {
1328 tmpaddr = NULL;
1329 }
1330retry:
1331 in6_dev_hold(idev);
1332 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1333 write_unlock_bh(&idev->lock);
f3213831 1334 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1335 in6_dev_put(idev);
1336 ret = -1;
1337 goto out;
1338 }
1339 spin_lock_bh(&ifp->lock);
1340 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1341 idev->cnf.use_tempaddr = -1; /*XXX*/
1342 spin_unlock_bh(&ifp->lock);
53bd6749 1343 write_unlock_bh(&idev->lock);
f3213831
JP		 1344 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1345 __func__);
1da177e4
LT		 1346 in6_dev_put(idev);
1347 ret = -1;
1348 goto out;
1349 }
1350 in6_ifa_hold(ifp);
1351 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
9d6280da 1352 ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1353 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1354 age = (now - ifp->tstamp) / HZ;
76506a98
JB		 1355
1356 regen_advance = idev->cnf.regen_max_retry *
1357 idev->cnf.dad_transmits *
1358 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1359
1360 /* recalculate max_desync_factor each time and update
1361 * idev->desync_factor if it's larger
1362 */
7aa8e63f 1363 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
76506a98
JB		 1364 max_desync_factor = min_t(__u32,
1365 idev->cnf.max_desync_factor,
7aa8e63f 1366 cnf_temp_preferred_lft - regen_advance);
76506a98
JB		 1367
1368 if (unlikely(idev->desync_factor > max_desync_factor)) {
1369 if (max_desync_factor > 0) {
1370 get_random_bytes(&idev->desync_factor,
1371 sizeof(idev->desync_factor));
1372 idev->desync_factor %= max_desync_factor;
1373 } else {
1374 idev->desync_factor = 0;
1375 }
1376 }
1377
3f2d67b6 1378 memset(&cfg, 0, sizeof(cfg));
e6464b8c 1379 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
7a876b0e 1380 idev->cnf.temp_valid_lft + age);
e6464b8c
DA		 1381 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1382 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1383
1384 cfg.plen = ifp->prefix_len;
1da177e4
LT		 1385 tmp_tstamp = ifp->tstamp;
1386 spin_unlock_bh(&ifp->lock);
1387
53bd6749 1388 write_unlock_bh(&idev->lock);
95c385b4 1389
eac55bf9
BB		 1390 /* A temporary address is created only if this calculated Preferred
1391 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1392 * an implementation must not create a temporary address with a zero
1393 * Preferred Lifetime.
ecab6701
HK		 1394 * Use age calculation as in addrconf_verify to avoid unnecessary
1395 * temporary addresses being generated.
eac55bf9 1396 */
ecab6701 1397 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
e6464b8c 1398 if (cfg.preferred_lft <= regen_advance + age) {
eac55bf9
BB		 1399 in6_ifa_put(ifp);
1400 in6_dev_put(idev);
1401 ret = -1;
1402 goto out;
1403 }
1404
e6464b8c 1405 cfg.ifa_flags = IFA_F_TEMPORARY;
95c385b4
NH		 1406 /* set in addrconf_prefix_rcv() */
1407 if (ifp->flags & IFA_F_OPTIMISTIC)
e6464b8c 1408 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
95c385b4 1409
e6464b8c
DA		 1410 cfg.pfx = &addr;
1411 cfg.scope = ipv6_addr_scope(cfg.pfx);
95c385b4 1412
e6464b8c 1413 ift = ipv6_add_addr(idev, &cfg, block, NULL);
4b08a8f1 1414 if (IS_ERR(ift)) {
1da177e4
LT		 1415 in6_ifa_put(ifp);
1416 in6_dev_put(idev);
f3213831 1417 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1418 tmpaddr = &addr;
53bd6749 1419 write_lock_bh(&idev->lock);
1da177e4
LT		 1420 goto retry;
1421 }
1422
1423 spin_lock_bh(&ift->lock);
1424 ift->ifpub = ifp;
76f793e3 1425 ift->cstamp = now;
1da177e4
LT		 1426 ift->tstamp = tmp_tstamp;
1427 spin_unlock_bh(&ift->lock);
1428
cf22f9a2 1429 addrconf_dad_start(ift);
1da177e4
LT		 1430 in6_ifa_put(ift);
1431 in6_dev_put(idev);
1432out:
1433 return ret;
1434}
1da177e4
LT		 1435
1436/*
072047e4 1437 * Choose an appropriate source address (RFC3484)
1da177e4 1438 */
a9b05723
YH		 1439enum {
1440 IPV6_SADDR_RULE_INIT = 0,
1441 IPV6_SADDR_RULE_LOCAL,
1442 IPV6_SADDR_RULE_SCOPE,
1443 IPV6_SADDR_RULE_PREFERRED,
1444#ifdef CONFIG_IPV6_MIP6
1445 IPV6_SADDR_RULE_HOA,
1446#endif
1447 IPV6_SADDR_RULE_OIF,
1448 IPV6_SADDR_RULE_LABEL,
a9b05723 1449 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1450 IPV6_SADDR_RULE_ORCHID,
1451 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1452#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1453 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1454#endif
a9b05723
YH		 1455 IPV6_SADDR_RULE_MAX
1456};
1457
072047e4 1458struct ipv6_saddr_score {
a9b05723
YH		 1459 int rule;
1460 int addr_type;
1461 struct inet6_ifaddr *ifa;
1462 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1463 int scopedist;
1464 int matchlen;
072047e4
YH		 1465};
1466
a9b05723 1467struct ipv6_saddr_dst {
9acd9f3a 1468 const struct in6_addr *addr;
a9b05723
YH		 1469 int ifindex;
1470 int scope;
1471 int label;
7cbca67c 1472 unsigned int prefs;
a9b05723 1473};
072047e4 1474
b6f99a21 1475static inline int ipv6_saddr_preferred(int type)
1da177e4 1476{
45bb0060 1477 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1478 return 1;
1479 return 0;
1da177e4
LT		 1480}
1481
35e015e1
MC		 1482static bool ipv6_use_optimistic_addr(struct net *net,
1483 struct inet6_dev *idev)
7fd2561e
EK		 1484{
1485#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 1486 if (!idev)
1487 return false;
1488 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1489 return false;
1490 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1491 return false;
1492
1493 return true;
7fd2561e
EK		 1494#else
1495 return false;
1496#endif
1497}
1498
f1c02cfb
SD		 1499static bool ipv6_allow_optimistic_dad(struct net *net,
1500 struct inet6_dev *idev)
1501{
1502#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1503 if (!idev)
1504 return false;
1505 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1506 return false;
1507
1508 return true;
1509#else
1510 return false;
1511#endif
1512}
1513
3de23255
BT		 1514static int ipv6_get_saddr_eval(struct net *net,
1515 struct ipv6_saddr_score *score,
a9b05723
YH		 1516 struct ipv6_saddr_dst *dst,
1517 int i)
1518{
1519 int ret;
1520
1521 if (i <= score->rule) {
1522 switch (i) {
1523 case IPV6_SADDR_RULE_SCOPE:
1524 ret = score->scopedist;
1525 break;
1526 case IPV6_SADDR_RULE_PREFIX:
1527 ret = score->matchlen;
1528 break;
1529 default:
1530 ret = !!test_bit(i, score->scorebits);
1531 }
1532 goto out;
1533 }
1534
1535 switch (i) {
1536 case IPV6_SADDR_RULE_INIT:
1537 /* Rule 0: remember if hiscore is not ready yet */
1538 ret = !!score->ifa;
1539 break;
1540 case IPV6_SADDR_RULE_LOCAL:
1541 /* Rule 1: Prefer same address */
1542 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1543 break;
1544 case IPV6_SADDR_RULE_SCOPE:
1545 /* Rule 2: Prefer appropriate scope
1546 *
1547 * ret
1548 * ^
1549 * -1 | d 15
1550 * ---+--+-+---> scope
1551 * |
1552 * | d is scope of the destination.
1553 * B-d | \
1554 * | \ <- smaller scope is better if
db9c7c39 1555 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1556 * | ret = B - scope (-1 <= scope >= d <= 15).
1557 * d-C-1 | /
1558 * |/ <- greater is better
1559 * -C / if scope is not enough for destination.
1560 * /| ret = scope - C (-1 <= d < scope <= 15).
1561 *
1562 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1563 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1564 * Assume B = 0 and we get C > 29.
1565 */
1566 ret = __ipv6_addr_src_scope(score->addr_type);
1567 if (ret >= dst->scope)
1568 ret = -ret;
1569 else
1570 ret -= 128; /* 30 is enough */
1571 score->scopedist = ret;
1572 break;
1573 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1574 {
a9b05723 1575 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1576 u8 avoid = IFA_F_DEPRECATED;
1577
35e015e1 1578 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
7fd2561e 1579 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1580 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1581 !(score->ifa->flags & avoid);
a9b05723 1582 break;
7fd2561e 1583 }
a9b05723
YH		 1584#ifdef CONFIG_IPV6_MIP6
1585 case IPV6_SADDR_RULE_HOA:
7cbca67c 1586 {
a9b05723 1587 /* Rule 4: Prefer home address */
7cbca67c
YH		 1588 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1589 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1590 break;
7cbca67c 1591 }
a9b05723
YH		 1592#endif
1593 case IPV6_SADDR_RULE_OIF:
1594 /* Rule 5: Prefer outgoing interface */
1595 ret = (!dst->ifindex ||
1596 dst->ifindex == score->ifa->idev->dev->ifindex);
1597 break;
1598 case IPV6_SADDR_RULE_LABEL:
1599 /* Rule 6: Prefer matching label */
3de23255
BT		 1600 ret = ipv6_addr_label(net,
1601 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1602 score->ifa->idev->dev->ifindex) == dst->label;
1603 break;
a9b05723 1604 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1605 {
a9b05723 1606 /* Rule 7: Prefer public address
25985edc 1607 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1608 */
7cbca67c
YH		 1609 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1610 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1611 score->ifa->idev->cnf.use_tempaddr >= 2;
1612 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1613 break;
7cbca67c 1614 }
a9b05723
YH		 1615 case IPV6_SADDR_RULE_ORCHID:
1616 /* Rule 8-: Prefer ORCHID vs ORCHID or
1617 * non-ORCHID vs non-ORCHID
1618 */
1619 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1620 ipv6_addr_orchid(dst->addr));
1621 break;
1622 case IPV6_SADDR_RULE_PREFIX:
1623 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1624 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1625 if (ret > score->ifa->prefix_len)
1626 ret = score->ifa->prefix_len;
1627 score->matchlen = ret;
a9b05723 1628 break;
7fd2561e
EK		 1629#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1630 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1631 /* Optimistic addresses still have lower precedence than other
1632 * preferred addresses.
1633 */
1634 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1635 break;
1636#endif
a9b05723
YH		 1637 default:
1638 ret = 0;
1639 }
1640
1641 if (ret)
1642 __set_bit(i, score->scorebits);
1643 score->rule = i;
1644out:
1645 return ret;
1646}
1647
c0b8da1e
YH		 1648static int __ipv6_dev_get_saddr(struct net *net,
1649 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1650 struct inet6_dev *idev,
1651 struct ipv6_saddr_score *scores,
1652 int hiscore_idx)
9131f3de 1653{
c0b8da1e 1654 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de 1655
f59c031e 1656 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
9131f3de
YH		 1657 int i;
1658
1659 /*
1660 * - Tentative Address (RFC2462 section 5.4)
1661 * - A tentative address is not considered
1662 * "assigned to an interface" in the traditional
1663 * sense, unless it is also flagged as optimistic.
1664 * - Candidate Source Address (section 4)
1665 * - In any case, anycast addresses, multicast
1666 * addresses, and the unspecified address MUST
1667 * NOT be included in a candidate set.
1668 */
1669 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1670 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1671 continue;
1672
1673 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1674
1675 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1676 score->addr_type & IPV6_ADDR_MULTICAST)) {
1677 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1678 idev->dev->name);
1679 continue;
1680 }
1681
1682 score->rule = -1;
1683 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1684
1685 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1686 int minihiscore, miniscore;
1687
1688 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1689 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1690
1691 if (minihiscore > miniscore) {
1692 if (i == IPV6_SADDR_RULE_SCOPE &&
1693 score->scopedist > 0) {
1694 /*
1695 * special case:
1696 * each remaining entry
1697 * has too small (not enough)
1698 * scope, because ifa entries
1699 * are sorted by their scope
1700 * values.
1701 */
1702 goto out;
1703 }
1704 break;
1705 } else if (minihiscore < miniscore) {
9131f3de 1706 swap(hiscore, score);
c0b8da1e 1707 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1708
1709 /* restore our iterator */
1710 score->ifa = hiscore->ifa;
1711
1712 break;
1713 }
1714 }
1715 }
1716out:
c0b8da1e 1717 return hiscore_idx;
9131f3de
YH		 1718}
1719
afbac601
DA		 1720static int ipv6_get_saddr_master(struct net *net,
1721 const struct net_device *dst_dev,
1722 const struct net_device *master,
1723 struct ipv6_saddr_dst *dst,
1724 struct ipv6_saddr_score *scores,
1725 int hiscore_idx)
1726{
1727 struct inet6_dev *idev;
1728
1729 idev = __in6_dev_get(dst_dev);
1730 if (idev)
1731 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1732 scores, hiscore_idx);
1733
1734 idev = __in6_dev_get(master);
1735 if (idev)
1736 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1737 scores, hiscore_idx);
1738
1739 return hiscore_idx;
1740}
1741
b3f644fc 1742int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1743 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1744 struct in6_addr *saddr)
1da177e4 1745{
c0b8da1e 1746 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1747 struct ipv6_saddr_dst dst;
9131f3de 1748 struct inet6_dev *idev;
072047e4 1749 struct net_device *dev;
a9b05723 1750 int dst_type;
9131f3de 1751 bool use_oif_addr = false;
c0b8da1e 1752 int hiscore_idx = 0;
cc429c8f 1753 int ret = 0;
1da177e4 1754
a9b05723
YH		 1755 dst_type = __ipv6_addr_type(daddr);
1756 dst.addr = daddr;
1757 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1758 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1759 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1760 dst.prefs = prefs;
a9b05723 1761
c0b8da1e
YH		 1762 scores[hiscore_idx].rule = -1;
1763 scores[hiscore_idx].ifa = NULL;
1da177e4 1764
8814c4b5 1765 rcu_read_lock();
1da177e4 1766
9131f3de
YH		 1767 /* Candidate Source Address (section 4)
1768 * - multicast and link-local destination address,
1769 * the set of candidate source address MUST only
1770 * include addresses assigned to interfaces
1771 * belonging to the same link as the outgoing
1772 * interface.
1773 * (- For site-local destination addresses, the
1774 * set of candidate source addresses MUST only
1775 * include addresses assigned to interfaces
1776 * belonging to the same site as the outgoing
1777 * interface.)
3985e8a3
EK		 1778 * - "It is RECOMMENDED that the candidate source addresses
1779 * be the set of unicast addresses assigned to the
1780 * interface that will be used to send to the destination
1781 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1782 */
1783 if (dst_dev) {
3985e8a3 1784 idev = __in6_dev_get(dst_dev);
9131f3de 1785 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1786 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1787 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1788 use_oif_addr = true;
1789 }
1790 }
a9b05723 1791
9131f3de 1792 if (use_oif_addr) {
c0b8da1e 1793 if (idev)
c15df306 1794 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de 1795 } else {
afbac601
DA		 1796 const struct net_device *master;
1797 int master_idx = 0;
1798
1799 /* if dst_dev exists and is enslaved to an L3 device, then
1800 * prefer addresses from dst_dev and then the master over
1801 * any other enslaved devices in the L3 domain.
1802 */
1803 master = l3mdev_master_dev_rcu(dst_dev);
1804 if (master) {
1805 master_idx = master->ifindex;
1806
1807 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1808 master, &dst,
1809 scores, hiscore_idx);
1810
1811 if (scores[hiscore_idx].ifa)
1812 goto out;
1813 }
1814
9131f3de 1815 for_each_netdev_rcu(net, dev) {
afbac601
DA		 1816 /* only consider addresses on devices in the
1817 * same L3 domain
1818 */
1819 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1820 continue;
9131f3de
YH		 1821 idev = __in6_dev_get(dev);
1822 if (!idev)
072047e4 1823 continue;
c15df306 1824 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1825 }
1826 }
afbac601
DA		 1827
1828out:
c0b8da1e 1829 hiscore = &scores[hiscore_idx];
a9b05723 1830 if (!hiscore->ifa)
cc429c8f
ED		 1831 ret = -EADDRNOTAVAIL;
1832 else
1833 *saddr = hiscore->ifa->addr;
1ab1457c 1834
cc429c8f
ED		 1835 rcu_read_unlock();
1836 return ret;
1da177e4 1837}
5e5f3f0f 1838EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1839
8965779d 1840int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1841 u32 banned_flags)
b7b1bfce
HFS		 1842{
1843 struct inet6_ifaddr *ifp;
1844 int err = -EADDRNOTAVAIL;
1845
602582ca
HFS		 1846 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1847 if (ifp->scope > IFA_LINK)
1848 break;
b7b1bfce
HFS		 1849 if (ifp->scope == IFA_LINK &&
1850 !(ifp->flags & banned_flags)) {
1851 *addr = ifp->addr;
1852 err = 0;
1853 break;
1854 }
1855 }
1856 return err;
1857}
1858
95c385b4 1859int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1860 u32 banned_flags)
1da177e4
LT		 1861{
1862 struct inet6_dev *idev;
1863 int err = -EADDRNOTAVAIL;
1864
8814c4b5 1865 rcu_read_lock();
e21e8467
SH		 1866 idev = __in6_dev_get(dev);
1867 if (idev) {
1da177e4 1868 read_lock_bh(&idev->lock);
b7b1bfce 1869 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1870 read_unlock_bh(&idev->lock);
1871 }
8814c4b5 1872 rcu_read_unlock();
1da177e4
LT		 1873 return err;
1874}
1875
d9bf82c2 1876static int ipv6_count_addresses(const struct inet6_dev *idev)
1da177e4 1877{
d9bf82c2 1878 const struct inet6_ifaddr *ifp;
1da177e4 1879 int cnt = 0;
1da177e4 1880
d9bf82c2
ED		 1881 rcu_read_lock();
1882 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1da177e4 1883 cnt++;
d9bf82c2 1884 rcu_read_unlock();
1da177e4
LT		 1885 return cnt;
1886}
1887
b71d1d42 1888int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1889 const struct net_device *dev, int strict)
c58da4c6 1890{
232378e8
DA		 1891 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1892 strict, IFA_F_TENTATIVE);
c58da4c6
EK		 1893}
1894EXPORT_SYMBOL(ipv6_chk_addr);
1895
1893ff20
DA		 1896/* device argument is used to find the L3 domain of interest. If
1897 * skip_dev_check is set, then the ifp device is not checked against
1898 * the passed in dev argument. So the 2 cases for addresses checks are:
1899 * 1. does the address exist in the L3 domain that dev is part of
1900 * (skip_dev_check = true), or
1901 *
1902 * 2. does the address exist on the specific device
1903 * (skip_dev_check = false)
1904 */
c58da4c6 1905int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
232378e8
DA		 1906 const struct net_device *dev, bool skip_dev_check,
1907 int strict, u32 banned_flags)
1da177e4 1908{
3f27fb23 1909 unsigned int hash = inet6_addr_hash(net, addr);
1893ff20 1910 const struct net_device *l3mdev;
eedf042a 1911 struct inet6_ifaddr *ifp;
c58da4c6 1912 u32 ifp_flags;
1da177e4 1913
480318a0 1914 rcu_read_lock();
232378e8 1915
1893ff20 1916 l3mdev = l3mdev_master_dev_rcu(dev);
232378e8
DA		 1917 if (skip_dev_check)
1918 dev = NULL;
1919
b67bfe0d 1920 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1921 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1922 continue;
1893ff20
DA		 1923
1924 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev)
1925 continue;
1926
c58da4c6
EK		 1927 /* Decouple optimistic from tentative for evaluation here.
1928 * Ban optimistic addresses explicitly, when required.
1929 */
1930 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1931 ? (ifp->flags&~IFA_F_TENTATIVE)
1932 : ifp->flags;
1da177e4 1933 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1934 !(ifp_flags&banned_flags) &&
63159f29 1935 (!dev || ifp->idev->dev == dev ||
eedf042a 1936 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
480318a0 1937 rcu_read_unlock();
eedf042a 1938 return 1;
1da177e4
LT		 1939 }
1940 }
5c578aed 1941
480318a0 1942 rcu_read_unlock();
eedf042a 1943 return 0;
1da177e4 1944}
c58da4c6 1945EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1946
1da177e4 1947
7df37ff3
CB		 1948/* Compares an address/prefix_len with addresses on device @dev.
1949 * If one is found it returns true.
1950 */
1951bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1952 const unsigned int prefix_len, struct net_device *dev)
1953{
47e26941
ED		 1954 const struct inet6_ifaddr *ifa;
1955 const struct inet6_dev *idev;
7df37ff3
CB		 1956 bool ret = false;
1957
1958 rcu_read_lock();
1959 idev = __in6_dev_get(dev);
1960 if (idev) {
47e26941 1961 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
7df37ff3
CB		 1962 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1963 if (ret)
1964 break;
1965 }
7df37ff3
CB		 1966 }
1967 rcu_read_unlock();
1968
1969 return ret;
1970}
1971EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1972
b71d1d42 1973int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84 1974{
24ba333b
ED		 1975 const struct inet6_ifaddr *ifa;
1976 const struct inet6_dev *idev;
52eeeb84
YH		 1977 int onlink;
1978
1979 onlink = 0;
1980 rcu_read_lock();
1981 idev = __in6_dev_get(dev);
1982 if (idev) {
24ba333b 1983 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1984 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1985 ifa->prefix_len);
1986 if (onlink)
1987 break;
1988 }
52eeeb84
YH		 1989 }
1990 rcu_read_unlock();
1991 return onlink;
1992}
52eeeb84
YH		 1993EXPORT_SYMBOL(ipv6_chk_prefix);
1994
9acd9f3a 1995struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1996 struct net_device *dev, int strict)
1da177e4 1997{
3f27fb23 1998 unsigned int hash = inet6_addr_hash(net, addr);
b79d1d54 1999 struct inet6_ifaddr *ifp, *result = NULL;
1da177e4 2000
24f226da
ED		 2001 rcu_read_lock();
2002 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 2003 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 2004 continue;
1da177e4 2005 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 2006 if (!dev || ifp->idev->dev == dev ||
1da177e4 2007 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 2008 result = ifp;
1da177e4
LT		 2009 in6_ifa_hold(ifp);
2010 break;
2011 }
2012 }
2013 }
24f226da 2014 rcu_read_unlock();
1da177e4 2015
b79d1d54 2016 return result;
1da177e4
LT		 2017}
2018
1da177e4
LT		 2019/* Gets referenced address, destroys ifaddr */
2020
cc411d0b 2021static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 2022{
3d171f39
LR		 2023 if (dad_failed)
2024 ifp->flags |= IFA_F_DADFAILED;
2025
ec8add2a 2026 if (ifp->flags&IFA_F_TEMPORARY) {
1da177e4
LT		 2027 struct inet6_ifaddr *ifpub;
2028 spin_lock_bh(&ifp->lock);
2029 ifpub = ifp->ifpub;
2030 if (ifpub) {
2031 in6_ifa_hold(ifpub);
2032 spin_unlock_bh(&ifp->lock);
fffcefe9 2033 ipv6_create_tempaddr(ifpub, ifp, true);
1da177e4
LT		 2034 in6_ifa_put(ifpub);
2035 } else {
2036 spin_unlock_bh(&ifp->lock);
2037 }
2038 ipv6_del_addr(ifp);
ec8add2a
SD		 2039 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2040 spin_lock_bh(&ifp->lock);
2041 addrconf_del_dad_work(ifp);
2042 ifp->flags |= IFA_F_TENTATIVE;
f1c02cfb
SD		 2043 if (dad_failed)
2044 ifp->flags &= ~IFA_F_OPTIMISTIC;
ec8add2a
SD		 2045 spin_unlock_bh(&ifp->lock);
2046 if (dad_failed)
2047 ipv6_ifa_notify(0, ifp);
2048 in6_ifa_put(ifp);
c15b1cca 2049 } else {
1da177e4 2050 ipv6_del_addr(ifp);
c15b1cca 2051 }
1da177e4
LT		 2052}
2053
f2344a13
HX		 2054static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2055{
2056 int err = -ENOENT;
2057
8e8e676d 2058 spin_lock_bh(&ifp->lock);
f2344a13
HX		 2059 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2060 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2061 err = 0;
2062 }
8e8e676d 2063 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 2064
2065 return err;
2066}
2067
da13c59b 2068void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
3c21edbd 2069{
1b34be74 2070 struct inet6_dev *idev = ifp->idev;
1855b7c3 2071 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 2072
853dc2e0
UB		 2073 if (addrconf_dad_end(ifp)) {
2074 in6_ifa_put(ifp);
f2344a13 2075 return;
853dc2e0 2076 }
f2344a13 2077
da13c59b
VP		 2078 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2079 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
9bdd8d40 2080
5f40ef77
HFS		 2081 spin_lock_bh(&ifp->lock);
2082
2083 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
5f40ef77
HFS		 2084 struct in6_addr new_addr;
2085 struct inet6_ifaddr *ifp2;
5f40ef77 2086 int retries = ifp->stable_privacy_retry + 1;
e6464b8c
DA		 2087 struct ifa6_config cfg = {
2088 .pfx = &new_addr,
2089 .plen = ifp->prefix_len,
2090 .ifa_flags = ifp->flags,
2091 .valid_lft = ifp->valid_lft,
2092 .preferred_lft = ifp->prefered_lft,
2093 .scope = ifp->scope,
2094 };
5f40ef77 2095
1855b7c3 2096 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 2097 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2098 ifp->idev->dev->name);
2099 goto errdad;
2100 }
2101
2102 new_addr = ifp->addr;
2103 if (ipv6_generate_stable_address(&new_addr, retries,
2104 idev))
2105 goto errdad;
2106
5f40ef77 2107 spin_unlock_bh(&ifp->lock);
1b34be74 2108
5f40ef77
HFS		 2109 if (idev->cnf.max_addresses &&
2110 ipv6_count_addresses(idev) >=
2111 idev->cnf.max_addresses)
2112 goto lock_errdad;
2113
2114 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2115 ifp->idev->dev->name);
2116
e6464b8c 2117 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
5f40ef77
HFS		 2118 if (IS_ERR(ifp2))
2119 goto lock_errdad;
2120
2121 spin_lock_bh(&ifp2->lock);
2122 ifp2->stable_privacy_retry = retries;
2123 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2124 spin_unlock_bh(&ifp2->lock);
2125
1855b7c3 2126 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 2127 in6_ifa_put(ifp2);
2128lock_errdad:
2129 spin_lock_bh(&ifp->lock);
1b34be74
YH		 2130 }
2131
5f40ef77 2132errdad:
c15b1cca
HFS		 2133 /* transition from _POSTDAD to _ERRDAD */
2134 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 2135 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 2136
2137 addrconf_mod_dad_work(ifp, 0);
751eb6b6 2138 in6_ifa_put(ifp);
3c21edbd 2139}
1da177e4 2140
a9ed4a29
SD		 2141/* Join to solicited addr multicast group.
2142 * caller must hold RTNL */
b71d1d42 2143void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 2144{
2145 struct in6_addr maddr;
2146
2147 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2148 return;
2149
2150 addrconf_addr_solict_mult(addr, &maddr);
2151 ipv6_dev_mc_inc(dev, &maddr);
2152}
2153
a9ed4a29 2154/* caller must hold RTNL */
b71d1d42 2155void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 2156{
2157 struct in6_addr maddr;
2158
2159 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2160 return;
2161
2162 addrconf_addr_solict_mult(addr, &maddr);
2163 __ipv6_dev_mc_dec(idev, &maddr);
2164}
2165
a9ed4a29 2166/* caller must hold RTNL */
20380731 2167static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2168{
2169 struct in6_addr addr;
c15b1cca 2170
88ad3149 2171 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 2172 return;
1da177e4
LT		 2173 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2174 if (ipv6_addr_any(&addr))
2175 return;
013b4d90 2176 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 2177}
2178
a9ed4a29 2179/* caller must hold RTNL */
20380731 2180static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2181{
2182 struct in6_addr addr;
c15b1cca 2183
88ad3149 2184 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 2185 return;
1da177e4
LT		 2186 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2187 if (ipv6_addr_any(&addr))
2188 return;
2189 __ipv6_dev_ac_dec(ifp->idev, &addr);
2190}
2191
8a7a4b47 2192static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
06a4c1c5 2193{
8a7a4b47
AA		 2194 switch (dev->addr_len) {
2195 case ETH_ALEN:
9dae2e03
LAD		 2196 memcpy(eui, dev->dev_addr, 3);
2197 eui[3] = 0xFF;
2198 eui[4] = 0xFE;
2199 memcpy(eui + 5, dev->dev_addr + 3, 3);
2200 break;
8a7a4b47
AA		 2201 case EUI64_ADDR_LEN:
2202 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2203 eui[0] ^= 2;
2204 break;
2205 default:
06a4c1c5 2206 return -1;
8a7a4b47
AA		 2207 }
2208
06a4c1c5 2209 return 0;
2210}
2211
cb6bf355
YH		 2212static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2213{
2214 union fwnet_hwaddr *ha;
2215
2216 if (dev->addr_len != FWNET_ALEN)
2217 return -1;
2218
2219 ha = (union fwnet_hwaddr *)dev->dev_addr;
2220
2221 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2222 eui[0] ^= 2;
2223 return 0;
2224}
2225
073a8e0e
YH		 2226static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2227{
2228 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2229 if (dev->addr_len != ARCNET_ALEN)
2230 return -1;
2231 memset(eui, 0, 7);
8e5e8f30 2232 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 2233 return 0;
2234}
2235
2236static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2237{
2238 if (dev->addr_len != INFINIBAND_ALEN)
2239 return -1;
2240 memcpy(eui, dev->dev_addr + 12, 8);
2241 eui[0] |= 2;
2242 return 0;
2243}
2244
c61393ea 2245static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2246{
9af28511
SH		 2247 if (addr == 0)
2248 return -1;
dfd982ba
YH		 2249 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2250 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2251 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2252 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2253 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2254 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2255 eui[1] = 0;
2256 eui[2] = 0x5E;
2257 eui[3] = 0xFE;
2258 memcpy(eui + 4, &addr, 4);
2259 return 0;
2260}
dfd982ba
YH		 2261
2262static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2263{
2264 if (dev->priv_flags & IFF_ISATAP)
2265 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2266 return -1;
2267}
2268
aee80b54 2269static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2270{
2271 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2272}
2273
e837735e
ND		 2274static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2275{
2276 memcpy(eui, dev->perm_addr, 3);
2277 memcpy(eui + 5, dev->perm_addr + 3, 3);
2278 eui[3] = 0xFF;
2279 eui[4] = 0xFE;
2280 eui[0] ^= 2;
2281 return 0;
2282}
2283
1da177e4
LT		 2284static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2285{
2286 switch (dev->type) {
2287 case ARPHRD_ETHER:
2288 case ARPHRD_FDDI:
073a8e0e 2289 return addrconf_ifid_eui48(eui, dev);
1da177e4 2290 case ARPHRD_ARCNET:
073a8e0e 2291 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2292 case ARPHRD_INFINIBAND:
073a8e0e 2293 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2294 case ARPHRD_SIT:
dfd982ba 2295 return addrconf_ifid_sit(eui, dev);
aee80b54 2296 case ARPHRD_IPGRE:
45ce0fd1 2297 case ARPHRD_TUNNEL:
aee80b54 2298 return addrconf_ifid_gre(eui, dev);
e74bccb8 2299 case ARPHRD_6LOWPAN:
8a7a4b47 2300 return addrconf_ifid_6lowpan(eui, dev);
cb6bf355
YH		 2301 case ARPHRD_IEEE1394:
2302 return addrconf_ifid_ieee1394(eui, dev);
e837735e 2303 case ARPHRD_TUNNEL6:
45ce0fd1 2304 case ARPHRD_IP6GRE:
9deb441c 2305 case ARPHRD_RAWIP:
e837735e 2306 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2307 }
2308 return -1;
2309}
2310
2311static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2312{
2313 int err = -1;
2314 struct inet6_ifaddr *ifp;
2315
2316 read_lock_bh(&idev->lock);
602582ca
HFS		 2317 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2318 if (ifp->scope > IFA_LINK)
2319 break;
1da177e4
LT		 2320 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2321 memcpy(eui, ifp->addr.s6_addr+8, 8);
2322 err = 0;
2323 break;
2324 }
2325 }
2326 read_unlock_bh(&idev->lock);
2327 return err;
2328}
2329
1da177e4 2330/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
9d6280da 2331static void ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2332{
1da177e4 2333regen:
955189ef 2334 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2335 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2336
2337 /*
2338 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2339 * check if generated address is not inappropriate
2340 *
2341 * - Reserved subnet anycast (RFC 2526)
2342 * 11111101 11....11 1xxxxxxx
c7dc89c0 2343 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2344 * 00-00-5E-FE-xx-xx-xx-xx
2345 * - value 0
2346 * - XXX: already assigned to an address on the device
2347 */
1ab1457c 2348 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2349 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2350 (idev->rndid[7]&0x80))
2351 goto regen;
2352 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2353 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2354 goto regen;
2355 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2356 goto regen;
2357 }
1da177e4
LT		 2358}
2359
9d6280da 2360static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2361{
1da177e4 2362 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
9d6280da 2363 ipv6_regen_rndid(idev);
1da177e4 2364}
1da177e4
LT		 2365
2366/*
2367 * Add prefix route.
2368 */
2369
2370static void
8308f3ff
DA		 2371addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2372 struct net_device *dev, unsigned long expires,
2373 u32 flags, gfp_t gfp_flags)
1da177e4 2374{
86872cb5 2375 struct fib6_config cfg = {
ca254490 2376 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
8308f3ff 2377 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
86872cb5
TG		 2378 .fc_ifindex = dev->ifindex,
2379 .fc_expires = expires,
2380 .fc_dst_len = plen,
2381 .fc_flags = RTF_UP | flags,
c346dca1 2382 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2383 .fc_protocol = RTPROT_KERNEL,
e8478e80 2384 .fc_type = RTN_UNICAST,
86872cb5 2385 };
1da177e4 2386
4e3fd7a0 2387 cfg.fc_dst = *pfx;
1da177e4
LT		 2388
2389 /* Prevent useless cloning on PtP SIT.
2390 This thing is done here expecting that the whole
2391 class of non-broadcast devices need not cloning.
2392 */
07a93626 2393#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2394 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2395 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2396#endif
1da177e4 2397
acb54e3c 2398 ip6_route_add(&cfg, gfp_flags, NULL);
1da177e4
LT		 2399}
2400
14ef37b6 2401
8d1c802b 2402static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
14ef37b6
AH		 2403 int plen,
2404 const struct net_device *dev,
2b2450ca
DA		 2405 u32 flags, u32 noflags,
2406 bool no_gw)
14ef37b6
AH		 2407{
2408 struct fib6_node *fn;
8d1c802b 2409 struct fib6_info *rt = NULL;
14ef37b6 2410 struct fib6_table *table;
ca254490 2411 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2412
ca254490 2413 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2414 if (!table)
14ef37b6
AH		 2415 return NULL;
2416
66f5d6ce 2417 rcu_read_lock();
38fbeeee 2418 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
14ef37b6
AH		 2419 if (!fn)
2420 goto out;
1f56a01f 2421
66f5d6ce 2422 for_each_fib6_node_rt_rcu(fn) {
f88d8ea6
DA		 2423 /* prefix routes only use builtin fib6_nh */
2424 if (rt->nh)
2425 continue;
2426
1cf844c7 2427 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
14ef37b6 2428 continue;
1cf844c7 2429 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2b2450ca 2430 continue;
93c2fb25 2431 if ((rt->fib6_flags & flags) != flags)
14ef37b6 2432 continue;
93c2fb25 2433 if ((rt->fib6_flags & noflags) != 0)
14ef37b6 2434 continue;
e873e4b9
WW		 2435 if (!fib6_info_hold_safe(rt))
2436 continue;
14ef37b6
AH		 2437 break;
2438 }
2439out:
66f5d6ce 2440 rcu_read_unlock();
14ef37b6
AH		 2441 return rt;
2442}
2443
2444
1da177e4
LT		 2445/* Create "default" multicast route to the interface */
2446
2447static void addrconf_add_mroute(struct net_device *dev)
2448{
86872cb5 2449 struct fib6_config cfg = {
ca254490 2450 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2451 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2452 .fc_ifindex = dev->ifindex,
2453 .fc_dst_len = 8,
2454 .fc_flags = RTF_UP,
e8478e80 2455 .fc_type = RTN_UNICAST,
c346dca1 2456 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2457 };
2458
2459 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2460
e500c6d3 2461 ip6_route_add(&cfg, GFP_KERNEL, NULL);
1da177e4
LT		 2462}
2463
1da177e4
LT		 2464static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2465{
2466 struct inet6_dev *idev;
2467
2468 ASSERT_RTNL();
2469
e21e8467 2470 idev = ipv6_find_idev(dev);
db0b99f5
SD		 2471 if (IS_ERR(idev))
2472 return idev;
64e724f6
BH		 2473
2474 if (idev->cnf.disable_ipv6)
2475 return ERR_PTR(-EACCES);
1da177e4
LT		 2476
2477 /* Add default multicast route */
ba46ee4c 2478 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
4af04aba 2479 addrconf_add_mroute(dev);
1da177e4 2480
1da177e4
LT		 2481 return idev;
2482}
2483
53bd6749
JP		 2484static void manage_tempaddrs(struct inet6_dev *idev,
2485 struct inet6_ifaddr *ifp,
2486 __u32 valid_lft, __u32 prefered_lft,
2487 bool create, unsigned long now)
2488{
2489 u32 flags;
2490 struct inet6_ifaddr *ift;
2491
2492 read_lock_bh(&idev->lock);
2493 /* update all temporary addresses in the list */
2494 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2495 int age, max_valid, max_prefered;
2496
2497 if (ifp != ift->ifpub)
2498 continue;
2499
2500 /* RFC 4941 section 3.3:
2501 * If a received option will extend the lifetime of a public
2502 * address, the lifetimes of temporary addresses should
2503 * be extended, subject to the overall constraint that no
2504 * temporary addresses should ever remain "valid" or "preferred"
2505 * for a time longer than (TEMP_VALID_LIFETIME) or
2506 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2507 */
2508 age = (now - ift->cstamp) / HZ;
2509 max_valid = idev->cnf.temp_valid_lft - age;
2510 if (max_valid < 0)
2511 max_valid = 0;
2512
2513 max_prefered = idev->cnf.temp_prefered_lft -
76506a98 2514 idev->desync_factor - age;
53bd6749
JP		 2515 if (max_prefered < 0)
2516 max_prefered = 0;
2517
2518 if (valid_lft > max_valid)
2519 valid_lft = max_valid;
2520
2521 if (prefered_lft > max_prefered)
2522 prefered_lft = max_prefered;
2523
2524 spin_lock(&ift->lock);
2525 flags = ift->flags;
2526 ift->valid_lft = valid_lft;
2527 ift->prefered_lft = prefered_lft;
2528 ift->tstamp = now;
2529 if (prefered_lft > 0)
2530 ift->flags &= ~IFA_F_DEPRECATED;
2531
2532 spin_unlock(&ift->lock);
2533 if (!(flags&IFA_F_TENTATIVE))
2534 ipv6_ifa_notify(0, ift);
2535 }
2536
2537 if ((create || list_empty(&idev->tempaddr_list)) &&
2538 idev->cnf.use_tempaddr > 0) {
2539 /* When a new public address is created as described
2540 * in [ADDRCONF], also create a new temporary address.
2541 * Also create a temporary address if it's enabled but
2542 * no temporary address currently exists.
2543 */
2544 read_unlock_bh(&idev->lock);
fffcefe9 2545 ipv6_create_tempaddr(ifp, NULL, false);
53bd6749
JP		 2546 } else {
2547 read_unlock_bh(&idev->lock);
2548 }
2549}
2550
cc9da6cc
BM		 2551static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2552{
d35a00b8
FJ		 2553 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2554 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc
BM		 2555}
2556
cc84b3c6
AA		 2557int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2558 const struct prefix_info *pinfo,
2559 struct inet6_dev *in6_dev,
2560 const struct in6_addr *addr, int addr_type,
2561 u32 addr_flags, bool sllao, bool tokenized,
2562 __u32 valid_lft, u32 prefered_lft)
4f672235
AA		 2563{
2564 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2565 int create = 0, update_lft = 0;
2566
2567 if (!ifp && valid_lft) {
2568 int max_addresses = in6_dev->cnf.max_addresses;
e6464b8c
DA		 2569 struct ifa6_config cfg = {
2570 .pfx = addr,
2571 .plen = pinfo->prefix_len,
2572 .ifa_flags = addr_flags,
2573 .valid_lft = valid_lft,
2574 .preferred_lft = prefered_lft,
2575 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2576 };
4f672235
AA		 2577
2578#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 2579 if ((net->ipv6.devconf_all->optimistic_dad ||
2580 in6_dev->cnf.optimistic_dad) &&
4f672235 2581 !net->ipv6.devconf_all->forwarding && sllao)
e6464b8c 2582 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
4f672235
AA		 2583#endif
2584
2585 /* Do not allow to create too much of autoconfigured
2586 * addresses; this would be too easy way to crash kernel.
2587 */
2588 if (!max_addresses ||
2589 ipv6_count_addresses(in6_dev) < max_addresses)
e6464b8c 2590 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
4f672235
AA		 2591
2592 if (IS_ERR_OR_NULL(ifp))
2593 return -1;
2594
4f672235
AA		 2595 create = 1;
2596 spin_lock_bh(&ifp->lock);
2597 ifp->flags |= IFA_F_MANAGETEMPADDR;
2598 ifp->cstamp = jiffies;
2599 ifp->tokenized = tokenized;
2600 spin_unlock_bh(&ifp->lock);
2601 addrconf_dad_start(ifp);
2602 }
2603
2604 if (ifp) {
2605 u32 flags;
2606 unsigned long now;
2607 u32 stored_lft;
2608
2609 /* update lifetime (RFC2462 5.5.3 e) */
2610 spin_lock_bh(&ifp->lock);
2611 now = jiffies;
2612 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2613 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2614 else
2615 stored_lft = 0;
f85f94b8 2616 if (!create && stored_lft) {
4f672235
AA		 2617 const u32 minimum_lft = min_t(u32,
2618 stored_lft, MIN_VALID_LIFETIME);
2619 valid_lft = max(valid_lft, minimum_lft);
2620
2621 /* RFC4862 Section 5.5.3e:
2622 * "Note that the preferred lifetime of the
2623 * corresponding address is always reset to
2624 * the Preferred Lifetime in the received
2625 * Prefix Information option, regardless of
2626 * whether the valid lifetime is also reset or
2627 * ignored."
2628 *
2629 * So we should always update prefered_lft here.
2630 */
2631 update_lft = 1;
2632 }
2633
2634 if (update_lft) {
2635 ifp->valid_lft = valid_lft;
2636 ifp->prefered_lft = prefered_lft;
2637 ifp->tstamp = now;
2638 flags = ifp->flags;
2639 ifp->flags &= ~IFA_F_DEPRECATED;
2640 spin_unlock_bh(&ifp->lock);
2641
2642 if (!(flags&IFA_F_TENTATIVE))
2643 ipv6_ifa_notify(0, ifp);
2644 } else
2645 spin_unlock_bh(&ifp->lock);
2646
2647 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2648 create, now);
2649
2650 in6_ifa_put(ifp);
2651 addrconf_verify();
2652 }
2653
2654 return 0;
2655}
cc84b3c6 2656EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
4f672235 2657
e6bff995 2658void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2659{
2660 struct prefix_info *pinfo;
2661 __u32 valid_lft;
2662 __u32 prefered_lft;
4f672235 2663 int addr_type, err;
64236f3f 2664 u32 addr_flags = 0;
1da177e4 2665 struct inet6_dev *in6_dev;
56d417b1 2666 struct net *net = dev_net(dev);
1da177e4
LT		 2667
2668 pinfo = (struct prefix_info *) opt;
1ab1457c 2669
1da177e4 2670 if (len < sizeof(struct prefix_info)) {
e32ac250 2671 netdev_dbg(dev, "addrconf: prefix option too short\n");
1da177e4
LT		 2672 return;
2673 }
1ab1457c 2674
1da177e4
LT		 2675 /*
2676 * Validation checks ([ADDRCONF], page 19)
2677 */
2678
2679 addr_type = ipv6_addr_type(&pinfo->prefix);
2680
2681 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2682 return;
2683
2684 valid_lft = ntohl(pinfo->valid);
2685 prefered_lft = ntohl(pinfo->prefered);
2686
2687 if (prefered_lft > valid_lft) {
e87cc472 2688 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2689 return;
2690 }
2691
2692 in6_dev = in6_dev_get(dev);
2693
63159f29 2694 if (!in6_dev) {
e87cc472
JP		 2695 net_dbg_ratelimited("addrconf: device %s not configured\n",
2696 dev->name);
1da177e4
LT		 2697 return;
2698 }
2699
2700 /*
2701 * Two things going on here:
2702 * 1) Add routes for on-link prefixes
2703 * 2) Configure prefixes with the auto flag set
2704 */
2705
4bed72e4 2706 if (pinfo->onlink) {
8d1c802b 2707 struct fib6_info *rt;
4bed72e4
YH		 2708 unsigned long rt_expires;
2709
6f704992
YH		 2710 /* Avoid arithmetic overflow. Really, we could
2711 * save rt_expires in seconds, likely valid_lft,
2712 * but it would require division in fib gc, that it
2713 * not good.
2714 */
4bed72e4
YH		 2715 if (HZ > USER_HZ)
2716 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2717 else
2718 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2719
4bed72e4
YH		 2720 if (addrconf_finite_timeout(rt_expires))
2721 rt_expires *= HZ;
1da177e4 2722
14ef37b6
AH		 2723 rt = addrconf_get_prefix_route(&pinfo->prefix,
2724 pinfo->prefix_len,
2725 dev,
2726 RTF_ADDRCONF | RTF_PREFIX_RT,
2b2450ca 2727 RTF_DEFAULT, true);
1da177e4 2728
14ef37b6 2729 if (rt) {
6f704992
YH		 2730 /* Autoconf prefix route */
2731 if (valid_lft == 0) {
afb1d4b5 2732 ip6_del_rt(net, rt);
6f704992 2733 rt = NULL;
4bed72e4 2734 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2735 /* not infinity */
14895687 2736 fib6_set_expires(rt, jiffies + rt_expires);
6f704992 2737 } else {
14895687 2738 fib6_clean_expires(rt);
1da177e4
LT		 2739 }
2740 } else if (valid_lft) {
6f704992 2741 clock_t expires = 0;
4bed72e4
YH		 2742 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2743 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2744 /* not infinity */
2745 flags |= RTF_EXPIRES;
2746 expires = jiffies_to_clock_t(rt_expires);
2747 }
1da177e4 2748 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
8308f3ff
DA		 2749 0, dev, expires, flags,
2750 GFP_ATOMIC);
1da177e4 2751 }
93531c67 2752 fib6_info_release(rt);
1da177e4
LT		 2753 }
2754
2755 /* Try to figure out our local address for this prefix */
2756
2757 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1da177e4 2758 struct in6_addr addr;
f997c55c 2759 bool tokenized = false, dev_addr_generated = false;
1da177e4
LT		 2760
2761 if (pinfo->prefix_len == 64) {
2762 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2763
2764 if (!ipv6_addr_any(&in6_dev->token)) {
2765 read_lock_bh(&in6_dev->lock);
2766 memcpy(addr.s6_addr + 8,
2767 in6_dev->token.s6_addr + 8, 8);
2768 read_unlock_bh(&in6_dev->lock);
617fe29d 2769 tokenized = true;
cc9da6cc 2770 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2771 !ipv6_generate_stable_address(&addr, 0,
2772 in6_dev)) {
64236f3f 2773 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2774 goto ok;
f53adae4
DB		 2775 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2776 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
4f672235 2777 goto put;
f997c55c
AA		 2778 } else {
2779 dev_addr_generated = true;
1da177e4
LT		 2780 }
2781 goto ok;
2782 }
e87cc472
JP		 2783 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2784 pinfo->prefix_len);
4f672235 2785 goto put;
1da177e4
LT		 2786
2787ok:
4f672235
AA		 2788 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2789 &addr, addr_type,
2790 addr_flags, sllao,
2791 tokenized, valid_lft,
2792 prefered_lft);
2793 if (err)
2794 goto put;
f997c55c
AA		 2795
2796 /* Ignore error case here because previous prefix add addr was
2797 * successful which will be notified.
2798 */
2799 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2800 addr_type, addr_flags, sllao,
2801 tokenized, valid_lft,
2802 prefered_lft,
2803 dev_addr_generated);
1da177e4
LT		 2804 }
2805 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
4f672235 2806put:
1da177e4
LT		 2807 in6_dev_put(in6_dev);
2808}
2809
2810/*
2811 * Set destination address.
2812 * Special case for SIT interfaces where we create a new "virtual"
2813 * device.
2814 */
af284937 2815int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2816{
2817 struct in6_ifreq ireq;
2818 struct net_device *dev;
2819 int err = -EINVAL;
2820
2821 rtnl_lock();
2822
2823 err = -EFAULT;
2824 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2825 goto err_exit;
2826
af284937 2827 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2828
2829 err = -ENODEV;
63159f29 2830 if (!dev)
1da177e4
LT		 2831 goto err_exit;
2832
07a93626 2833#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2834 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2835 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2836 struct ifreq ifr;
1da177e4
LT		 2837 struct ip_tunnel_parm p;
2838
2839 err = -EADDRNOTAVAIL;
2840 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2841 goto err_exit;
2842
2843 memset(&p, 0, sizeof(p));
2844 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2845 p.iph.saddr = 0;
2846 p.iph.version = 4;
2847 p.iph.ihl = 5;
2848 p.iph.protocol = IPPROTO_IPV6;
2849 p.iph.ttl = 64;
d20b3109 2850 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2851
5bc3eb7e
SH		 2852 if (ops->ndo_do_ioctl) {
2853 mm_segment_t oldfs = get_fs();
2854
2855 set_fs(KERNEL_DS);
2856 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2857 set_fs(oldfs);
2858 } else
2859 err = -EOPNOTSUPP;
1da177e4
LT		 2860
2861 if (err == 0) {
2862 err = -ENOBUFS;
af284937
DL		 2863 dev = __dev_get_by_name(net, p.name);
2864 if (!dev)
1da177e4 2865 goto err_exit;
00f54e68 2866 err = dev_open(dev, NULL);
1da177e4
LT		 2867 }
2868 }
0be669bb 2869#endif
1da177e4
LT		 2870
2871err_exit:
2872 rtnl_unlock();
2873 return err;
2874}
2875
93a714d6
MC		 2876static int ipv6_mc_config(struct sock *sk, bool join,
2877 const struct in6_addr *addr, int ifindex)
2878{
2879 int ret;
2880
2881 ASSERT_RTNL();
2882
2883 lock_sock(sk);
2884 if (join)
54ff9ef3 2885 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2886 else
54ff9ef3 2887 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2888 release_sock(sk);
2889
2890 return ret;
2891}
2892
1da177e4
LT		 2893/*
2894 * Manual configuration of address on an interface
2895 */
479840ff 2896static int inet6_addr_add(struct net *net, int ifindex,
19b1518c 2897 struct ifa6_config *cfg,
de95e047 2898 struct netlink_ext_ack *extack)
1da177e4
LT		 2899{
2900 struct inet6_ifaddr *ifp;
2901 struct inet6_dev *idev;
2902 struct net_device *dev;
93a714d6
MC		 2903 unsigned long timeout;
2904 clock_t expires;
6f704992 2905 u32 flags;
1da177e4
LT		 2906
2907 ASSERT_RTNL();
1ab1457c 2908
19b1518c 2909 if (cfg->plen > 128)
24ef0da7
TG		 2910 return -EINVAL;
2911
0778769d 2912 /* check the lifetime */
19b1518c 2913 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
0778769d
NT		 2914 return -EINVAL;
2915
19b1518c 2916 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
53bd6749
JP		 2917 return -EINVAL;
2918
af284937
DL		 2919 dev = __dev_get_by_index(net, ifindex);
2920 if (!dev)
1da177e4 2921 return -ENODEV;
1ab1457c 2922
64e724f6
BH		 2923 idev = addrconf_add_dev(dev);
2924 if (IS_ERR(idev))
2925 return PTR_ERR(idev);
1da177e4 2926
19b1518c 2927 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
93a714d6 2928 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
19b1518c 2929 true, cfg->pfx, ifindex);
93a714d6
MC		 2930
2931 if (ret < 0)
2932 return ret;
2933 }
2934
19b1518c 2935 cfg->scope = ipv6_addr_scope(cfg->pfx);
1da177e4 2936
19b1518c 2937 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4bed72e4
YH		 2938 if (addrconf_finite_timeout(timeout)) {
2939 expires = jiffies_to_clock_t(timeout * HZ);
19b1518c 2940 cfg->valid_lft = timeout;
6f704992 2941 flags = RTF_EXPIRES;
4bed72e4
YH		 2942 } else {
2943 expires = 0;
2944 flags = 0;
19b1518c 2945 cfg->ifa_flags |= IFA_F_PERMANENT;
6f704992 2946 }
0778769d 2947
19b1518c 2948 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4bed72e4
YH		 2949 if (addrconf_finite_timeout(timeout)) {
2950 if (timeout == 0)
19b1518c
DA		 2951 cfg->ifa_flags |= IFA_F_DEPRECATED;
2952 cfg->preferred_lft = timeout;
4bed72e4 2953 }
0778769d 2954
19b1518c 2955 ifp = ipv6_add_addr(idev, cfg, true, extack);
1da177e4 2956 if (!IS_ERR(ifp)) {
19b1518c 2957 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
8308f3ff
DA		 2958 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2959 ifp->rt_priority, dev, expires,
2960 flags, GFP_KERNEL);
761aac73
TH		 2961 }
2962
a2d481b3
LB		 2963 /* Send a netlink notification if DAD is enabled and
2964 * optimistic flag is not set
2965 */
2966 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2967 ipv6_ifa_notify(0, ifp);
95c385b4
NH		 2968 /*
2969 * Note that section 3.1 of RFC 4429 indicates
2970 * that the Optimistic flag should not be set for
2971 * manually configured addresses
2972 */
cf22f9a2 2973 addrconf_dad_start(ifp);
19b1518c
DA		 2974 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2975 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2976 cfg->preferred_lft, true, jiffies);
1da177e4 2977 in6_ifa_put(ifp);
c15b1cca 2978 addrconf_verify_rtnl();
1da177e4 2979 return 0;
19b1518c
DA		 2980 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2981 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
2982 cfg->pfx, ifindex);
1da177e4
LT		 2983 }
2984
2985 return PTR_ERR(ifp);
2986}
2987
6046d5b4
HK		 2988static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2989 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2990{
2991 struct inet6_ifaddr *ifp;
2992 struct inet6_dev *idev;
2993 struct net_device *dev;
1ab1457c 2994
24ef0da7
TG		 2995 if (plen > 128)
2996 return -EINVAL;
2997
af284937
DL		 2998 dev = __dev_get_by_index(net, ifindex);
2999 if (!dev)
1da177e4
LT		 3000 return -ENODEV;
3001
e5d08d71 3002 idev = __in6_dev_get(dev);
63159f29 3003 if (!idev)
1da177e4
LT		 3004 return -ENXIO;
3005
3006 read_lock_bh(&idev->lock);
502a2ffd 3007 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 3008 if (ifp->prefix_len == plen &&
3009 ipv6_addr_equal(pfx, &ifp->addr)) {
3010 in6_ifa_hold(ifp);
3011 read_unlock_bh(&idev->lock);
1ab1457c 3012
6046d5b4
HK		 3013 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3014 (ifa_flags & IFA_F_MANAGETEMPADDR))
3015 manage_tempaddrs(idev, ifp, 0, 0, false,
3016 jiffies);
1da177e4 3017 ipv6_del_addr(ifp);
6046d5b4 3018 addrconf_verify_rtnl();
93a714d6
MC		 3019 if (ipv6_addr_is_multicast(pfx)) {
3020 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3021 false, pfx, dev->ifindex);
3022 }
1da177e4
LT		 3023 return 0;
3024 }
3025 }
3026 read_unlock_bh(&idev->lock);
3027 return -EADDRNOTAVAIL;
3028}
3029
3030
af284937 3031int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4 3032{
19b1518c
DA		 3033 struct ifa6_config cfg = {
3034 .ifa_flags = IFA_F_PERMANENT,
3035 .preferred_lft = INFINITY_LIFE_TIME,
3036 .valid_lft = INFINITY_LIFE_TIME,
3037 };
1da177e4
LT		 3038 struct in6_ifreq ireq;
3039 int err;
1ab1457c 3040
af31f412 3041 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 3042 return -EPERM;
1ab1457c 3043
1da177e4
LT		 3044 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3045 return -EFAULT;
3046
19b1518c
DA		 3047 cfg.pfx = &ireq.ifr6_addr;
3048 cfg.plen = ireq.ifr6_prefixlen;
3049
1da177e4 3050 rtnl_lock();
19b1518c 3051 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
1da177e4
LT		 3052 rtnl_unlock();
3053 return err;
3054}
3055
af284937 3056int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 3057{
3058 struct in6_ifreq ireq;
3059 int err;
1ab1457c 3060
af31f412 3061 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 3062 return -EPERM;
3063
3064 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3065 return -EFAULT;
3066
3067 rtnl_lock();
6046d5b4 3068 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 3069 ireq.ifr6_prefixlen);
1da177e4
LT		 3070 rtnl_unlock();
3071 return err;
3072}
3073
b5f348e5
IJ		 3074static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3075 int plen, int scope)
3076{
3077 struct inet6_ifaddr *ifp;
e6464b8c
DA		 3078 struct ifa6_config cfg = {
3079 .pfx = addr,
3080 .plen = plen,
3081 .ifa_flags = IFA_F_PERMANENT,
3082 .valid_lft = INFINITY_LIFE_TIME,
3083 .preferred_lft = INFINITY_LIFE_TIME,
3084 .scope = scope
3085 };
b5f348e5 3086
e6464b8c 3087 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
b5f348e5
IJ		 3088 if (!IS_ERR(ifp)) {
3089 spin_lock_bh(&ifp->lock);
3090 ifp->flags &= ~IFA_F_TENTATIVE;
3091 spin_unlock_bh(&ifp->lock);
764d3be6 3092 rt_genid_bump_ipv6(dev_net(idev->dev));
b5f348e5
IJ		 3093 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3094 in6_ifa_put(ifp);
3095 }
3096}
3097
07a93626 3098#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3099static void sit_add_v4_addrs(struct inet6_dev *idev)
3100{
1da177e4
LT		 3101 struct in6_addr addr;
3102 struct net_device *dev;
c346dca1 3103 struct net *net = dev_net(idev->dev);
929c9cf3 3104 int scope, plen;
f0e2acfa 3105 u32 pflags = 0;
1da177e4
LT		 3106
3107 ASSERT_RTNL();
3108
3109 memset(&addr, 0, sizeof(struct in6_addr));
3110 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3111
3112 if (idev->dev->flags&IFF_POINTOPOINT) {
3113 addr.s6_addr32[0] = htonl(0xfe800000);
3114 scope = IFA_LINK;
929c9cf3 3115 plen = 64;
1da177e4
LT		 3116 } else {
3117 scope = IPV6_ADDR_COMPATv4;
929c9cf3 3118 plen = 96;
f0e2acfa 3119 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 3120 }
3121
3122 if (addr.s6_addr32[3]) {
929c9cf3 3123 add_addr(idev, &addr, plen, scope);
8308f3ff 3124 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
e500c6d3 3125 GFP_KERNEL);
1da177e4
LT		 3126 return;
3127 }
3128
6fda7350 3129 for_each_netdev(net, dev) {
8e5e8f30 3130 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 3131 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 3132 struct in_ifaddr *ifa;
1da177e4
LT		 3133 int flag = scope;
3134
cd5a411d 3135 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1da177e4
LT		 3136 addr.s6_addr32[3] = ifa->ifa_local;
3137
3138 if (ifa->ifa_scope == RT_SCOPE_LINK)
3139 continue;
3140 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3141 if (idev->dev->flags&IFF_POINTOPOINT)
3142 continue;
3143 flag |= IFA_HOST;
3144 }
1da177e4 3145
b5f348e5 3146 add_addr(idev, &addr, plen, flag);
8308f3ff 3147 addrconf_prefix_route(&addr, plen, 0, idev->dev,
e500c6d3 3148 0, pflags, GFP_KERNEL);
1da177e4
LT		 3149 }
3150 }
1ab1457c 3151 }
1da177e4 3152}
0be669bb 3153#endif
1da177e4
LT		 3154
3155static void init_loopback(struct net_device *dev)
3156{
3157 struct inet6_dev *idev;
1da177e4
LT		 3158
3159 /* ::1 */
3160
3161 ASSERT_RTNL();
3162
e5d08d71 3163 idev = ipv6_find_idev(dev);
db0b99f5 3164 if (IS_ERR(idev)) {
91df42be 3165 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3166 return;
3167 }
3168
b5f348e5 3169 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 3170}
3171
2ad3ed59
AA		 3172void addrconf_add_linklocal(struct inet6_dev *idev,
3173 const struct in6_addr *addr, u32 flags)
1da177e4 3174{
e6464b8c
DA		 3175 struct ifa6_config cfg = {
3176 .pfx = addr,
3177 .plen = 64,
3178 .ifa_flags = flags | IFA_F_PERMANENT,
3179 .valid_lft = INFINITY_LIFE_TIME,
3180 .preferred_lft = INFINITY_LIFE_TIME,
3181 .scope = IFA_LINK
3182 };
8e5e8f30 3183 struct inet6_ifaddr *ifp;
95c385b4
NH		 3184
3185#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 3186 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3187 idev->cnf.optimistic_dad) &&
702beb87 3188 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
e6464b8c 3189 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
95c385b4 3190#endif
1da177e4 3191
e6464b8c 3192 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
1da177e4 3193 if (!IS_ERR(ifp)) {
8308f3ff 3194 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
acb54e3c 3195 0, 0, GFP_ATOMIC);
cf22f9a2 3196 addrconf_dad_start(ifp);
1da177e4
LT		 3197 in6_ifa_put(ifp);
3198 }
3199}
2ad3ed59 3200EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
1da177e4 3201
622c81d5
HFS		 3202static bool ipv6_reserved_interfaceid(struct in6_addr address)
3203{
3204 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3205 return true;
3206
3207 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3208 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3209 return true;
3210
3211 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3212 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3213 return true;
3214
3215 return false;
3216}
3217
3218static int ipv6_generate_stable_address(struct in6_addr *address,
3219 u8 dad_count,
3220 const struct inet6_dev *idev)
3221{
622c81d5
HFS		 3222 static DEFINE_SPINLOCK(lock);
3223 static __u32 digest[SHA_DIGEST_WORDS];
3224 static __u32 workspace[SHA_WORKSPACE_WORDS];
3225
3226 static union {
3227 char __data[SHA_MESSAGE_BYTES];
3228 struct {
3229 struct in6_addr secret;
ff40217e 3230 __be32 prefix[2];
622c81d5
HFS		 3231 unsigned char hwaddr[MAX_ADDR_LEN];
3232 u8 dad_count;
3233 } __packed;
3234 } data;
3235
3236 struct in6_addr secret;
3237 struct in6_addr temp;
3238 struct net *net = dev_net(idev->dev);
3239
3240 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3241
3242 if (idev->cnf.stable_secret.initialized)
3243 secret = idev->cnf.stable_secret.secret;
3244 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3245 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3246 else
3247 return -1;
3248
3249retry:
3250 spin_lock_bh(&lock);
3251
3252 sha_init(digest);
3253 memset(&data, 0, sizeof(data));
3254 memset(workspace, 0, sizeof(workspace));
3255 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3256 data.prefix[0] = address->s6_addr32[0];
3257 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3258 data.secret = secret;
3259 data.dad_count = dad_count;
3260
3261 sha_transform(digest, data.__data, workspace);
3262
3263 temp = *address;
ff40217e
HFS		 3264 temp.s6_addr32[2] = (__force __be32)digest[0];
3265 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3266
3267 spin_unlock_bh(&lock);
3268
3269 if (ipv6_reserved_interfaceid(temp)) {
3270 dad_count++;
1855b7c3 3271 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3272 return -1;
3273 goto retry;
3274 }
3275
3276 *address = temp;
3277 return 0;
3278}
3279
cc9da6cc
BM		 3280static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3281{
3282 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3283
3284 if (s->initialized)
3285 return;
3286 s = &idev->cnf.stable_secret;
3287 get_random_bytes(&s->secret, sizeof(s->secret));
3288 s->initialized = true;
3289}
3290
bc91b0f0
JP		 3291static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3292{
622c81d5
HFS		 3293 struct in6_addr addr;
3294
ca254490
DA		 3295 /* no link local addresses on L3 master devices */
3296 if (netif_is_l3_master(idev->dev))
3297 return;
3298
622c81d5 3299 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3300
d35a00b8 3301 switch (idev->cnf.addr_gen_mode) {
cc9da6cc
BM		 3302 case IN6_ADDR_GEN_MODE_RANDOM:
3303 ipv6_gen_mode_random_init(idev);
3304 /* fallthrough */
3305 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3306 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3307 addrconf_add_linklocal(idev, &addr,
3308 IFA_F_STABLE_PRIVACY);
622c81d5 3309 else if (prefix_route)
8308f3ff 3310 addrconf_prefix_route(&addr, 64, 0, idev->dev,
acb54e3c 3311 0, 0, GFP_KERNEL);
cc9da6cc
BM		 3312 break;
3313 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3314 /* addrconf_add_linklocal also adds a prefix_route and we
3315 * only need to care about prefix routes if ipv6_generate_eui64
3316 * couldn't generate one.
3317 */
3318 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3319 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0 3320 else if (prefix_route)
8308f3ff 3321 addrconf_prefix_route(&addr, 64, 0, idev->dev,
27b10608 3322 0, 0, GFP_KERNEL);
cc9da6cc
BM		 3323 break;
3324 case IN6_ADDR_GEN_MODE_NONE:
3325 default:
3326 /* will not add any link local address */
3327 break;
bc91b0f0
JP		 3328 }
3329}
3330
1da177e4
LT		 3331static void addrconf_dev_config(struct net_device *dev)
3332{
8e5e8f30 3333 struct inet6_dev *idev;
1da177e4
LT		 3334
3335 ASSERT_RTNL();
3336
74235a25
HX		 3337 if ((dev->type != ARPHRD_ETHER) &&
3338 (dev->type != ARPHRD_FDDI) &&
74235a25 3339 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3340 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3341 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3342 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc 3343 (dev->type != ARPHRD_6LOWPAN) &&
45ce0fd1
FJ		 3344 (dev->type != ARPHRD_IP6GRE) &&
3345 (dev->type != ARPHRD_IPGRE) &&
3346 (dev->type != ARPHRD_TUNNEL) &&
9deb441c
SAK		 3347 (dev->type != ARPHRD_NONE) &&
3348 (dev->type != ARPHRD_RAWIP)) {
74235a25
HX		 3349 /* Alas, we support only Ethernet autoconfiguration. */
3350 return;
3351 }
3352
1da177e4 3353 idev = addrconf_add_dev(dev);
64e724f6 3354 if (IS_ERR(idev))
1da177e4
LT		 3355 return;
3356
cc9da6cc
BM		 3357 /* this device type has no EUI support */
3358 if (dev->type == ARPHRD_NONE &&
d35a00b8
FJ		 3359 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3360 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc 3361
bc91b0f0 3362 addrconf_addr_gen(idev, false);
1da177e4
LT		 3363}
3364
07a93626 3365#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3366static void addrconf_sit_config(struct net_device *dev)
3367{
3368 struct inet6_dev *idev;
3369
3370 ASSERT_RTNL();
3371
1ab1457c
YH		 3372 /*
3373 * Configure the tunnel with one of our IPv4
3374 * addresses... we should configure all of
1da177e4
LT		 3375 * our v4 addrs in the tunnel
3376 */
3377
e5d08d71 3378 idev = ipv6_find_idev(dev);
db0b99f5 3379 if (IS_ERR(idev)) {
91df42be 3380 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3381 return;
3382 }
3383
c7dc89c0 3384 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3385 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3386 return;
3387 }
3388
1da177e4
LT		 3389 sit_add_v4_addrs(idev);
3390
62b54dd9 3391 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3392 addrconf_add_mroute(dev);
1da177e4 3393}
0be669bb 3394#endif
1da177e4 3395
07a93626 3396#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3397static void addrconf_gre_config(struct net_device *dev)
3398{
3399 struct inet6_dev *idev;
aee80b54 3400
aee80b54 3401 ASSERT_RTNL();
3402
e5d08d71 3403 idev = ipv6_find_idev(dev);
db0b99f5 3404 if (IS_ERR(idev)) {
91df42be 3405 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3406 return;
3407 }
3408
bc91b0f0 3409 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3410 if (dev->flags & IFF_POINTOPOINT)
3411 addrconf_add_mroute(dev);
aee80b54 3412}
3413#endif
3414
afb1d4b5
DA		 3415static int fixup_permanent_addr(struct net *net,
3416 struct inet6_dev *idev,
f1705ec1
DA		 3417 struct inet6_ifaddr *ifp)
3418{
93c2fb25 3419 /* !fib6_node means the host route was removed from the
8048ced9
DA		 3420 * FIB, for example, if 'lo' device is taken down. In that
3421 * case regenerate the host route.
3422 */
93c2fb25 3423 if (!ifp->rt || !ifp->rt->fib6_node) {
360a9887 3424 struct fib6_info *f6i, *prev;
f1705ec1 3425
360a9887
DA		 3426 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3427 GFP_ATOMIC);
3428 if (IS_ERR(f6i))
3429 return PTR_ERR(f6i);
f1705ec1 3430
8048ced9
DA		 3431 /* ifp->rt can be accessed outside of rtnl */
3432 spin_lock(&ifp->lock);
3433 prev = ifp->rt;
360a9887 3434 ifp->rt = f6i;
8048ced9
DA		 3435 spin_unlock(&ifp->lock);
3436
93531c67 3437 fib6_info_release(prev);
f1705ec1
DA		 3438 }
3439
3440 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3441 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
8308f3ff
DA		 3442 ifp->rt_priority, idev->dev, 0, 0,
3443 GFP_ATOMIC);
f1705ec1
DA		 3444 }
3445
6d717134
DA		 3446 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3447 addrconf_dad_start(ifp);
f1705ec1
DA		 3448
3449 return 0;
3450}
3451
afb1d4b5 3452static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
f1705ec1
DA		 3453{
3454 struct inet6_ifaddr *ifp, *tmp;
3455 struct inet6_dev *idev;
3456
3457 idev = __in6_dev_get(dev);
3458 if (!idev)
3459 return;
3460
3461 write_lock_bh(&idev->lock);
3462
3463 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3464 if ((ifp->flags & IFA_F_PERMANENT) &&
afb1d4b5 3465 fixup_permanent_addr(net, idev, ifp) < 0) {
f1705ec1 3466 write_unlock_bh(&idev->lock);
e669b869 3467 in6_ifa_hold(ifp);
f1705ec1
DA		 3468 ipv6_del_addr(ifp);
3469 write_lock_bh(&idev->lock);
3470
3471 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3472 idev->dev->name, &ifp->addr);
3473 }
3474 }
3475
3476 write_unlock_bh(&idev->lock);
3477}
3478
1ab1457c 3479static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3480 void *ptr)
1da177e4 3481{
351638e7 3482 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
896585d4 3483 struct netdev_notifier_change_info *change_info;
4f7f34ea 3484 struct netdev_notifier_changeupper_info *info;
748e2d93 3485 struct inet6_dev *idev = __in6_dev_get(dev);
60abc0be 3486 struct net *net = dev_net(dev);
c5e33bdd 3487 int run_pending = 0;
b217d616 3488 int err;
1da177e4 3489
e21e8467 3490 switch (event) {
45ba9dd2 3491 case NETDEV_REGISTER:
74235a25 3492 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3493 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3494 if (IS_ERR(idev))
3495 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3496 }
3497 break;
bcdd553f 3498
b7b0b1d2
AD		 3499 case NETDEV_CHANGEMTU:
3500 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3501 if (dev->mtu < IPV6_MIN_MTU) {
60abc0be 3502 addrconf_ifdown(dev, dev != net->loopback_dev);
b7b0b1d2
AD		 3503 break;
3504 }
3505
3506 if (idev) {
3507 rt6_mtu_change(dev, dev->mtu);
3508 idev->cnf.mtu6 = dev->mtu;
3509 break;
3510 }
3511
3512 /* allocate new idev */
3513 idev = ipv6_add_dev(dev);
3514 if (IS_ERR(idev))
3515 break;
3516
3517 /* device is still not ready */
3518 if (!(idev->if_flags & IF_READY))
3519 break;
3520
3521 run_pending = 1;
3522
3523 /* fall through */
3524
1da177e4 3525 case NETDEV_UP:
3c21edbd 3526 case NETDEV_CHANGE:
c2edacf8
JV		 3527 if (dev->flags & IFF_SLAVE)
3528 break;
3529
3ce62a84
WC		 3530 if (idev && idev->cnf.disable_ipv6)
3531 break;
3532
3c21edbd 3533 if (event == NETDEV_UP) {
38bd10c4 3534 /* restore routes for permanent addresses */
afb1d4b5 3535 addrconf_permanent_addr(net, dev);
38bd10c4 3536
1f372c7b 3537 if (!addrconf_link_ready(dev)) {
3c21edbd 3538 /* device is not ready yet. */
7c62b8dd
LR		 3539 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3540 dev->name);
3c21edbd
YH		 3541 break;
3542 }
99081049 3543
d31c7b8f
EP		 3544 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3545 idev = ipv6_add_dev(dev);
3546
a317a2f1 3547 if (!IS_ERR_OR_NULL(idev)) {
99081049 3548 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3549 run_pending = 1;
3550 }
b7b0b1d2 3551 } else if (event == NETDEV_CHANGE) {
1f372c7b 3552 if (!addrconf_link_ready(dev)) {
3c21edbd 3553 /* device is still not ready. */
27c6fa73 3554 rt6_sync_down_dev(dev, event);
3c21edbd
YH		 3555 break;
3556 }
3557
896585d4 3558 if (!IS_ERR_OR_NULL(idev)) {
a088d1d7
LL		 3559 if (idev->if_flags & IF_READY) {
3560 /* device is already configured -
3561 * but resend MLD reports, we might
3562 * have roamed and need to update
3563 * multicast snooping switches
3564 */
3565 ipv6_mc_up(idev);
896585d4
HL		 3566 change_info = ptr;
3567 if (change_info->flags_changed & IFF_NOARP)
3568 addrconf_dad_run(idev, true);
27c6fa73 3569 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3c21edbd 3570 break;
a088d1d7 3571 }
3c21edbd
YH		 3572 idev->if_flags |= IF_READY;
3573 }
3574
f3213831
JP		 3575 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3576 dev->name);
3c21edbd 3577
c5e33bdd 3578 run_pending = 1;
3c21edbd
YH		 3579 }
3580
e21e8467 3581 switch (dev->type) {
07a93626 3582#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3583 case ARPHRD_SIT:
3584 addrconf_sit_config(dev);
3585 break;
aee80b54 3586#endif
07a93626 3587#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3588 case ARPHRD_IPGRE:
3589 addrconf_gre_config(dev);
3590 break;
0be669bb 3591#endif
1da177e4
LT		 3592 case ARPHRD_LOOPBACK:
3593 init_loopback(dev);
3594 break;
3595
3596 default:
3597 addrconf_dev_config(dev);
3598 break;
3ff50b79 3599 }
bcdd553f 3600
a317a2f1 3601 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd 3602 if (run_pending)
896585d4 3603 addrconf_dad_run(idev, false);
c5e33bdd 3604
2127d95a
IS		 3605 /* Device has an address by now */
3606 rt6_sync_up(dev, RTNH_F_DEAD);
3607
bcdd553f
SH		 3608 /*
3609 * If the MTU changed during the interface down,
3610 * when the interface up, the changed MTU must be
3611 * reflected in the idev as well as routers.
1da177e4 3612 */
bcdd553f
SH		 3613 if (idev->cnf.mtu6 != dev->mtu &&
3614 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3615 rt6_mtu_change(dev, dev->mtu);
3616 idev->cnf.mtu6 = dev->mtu;
3617 }
3618 idev->tstamp = jiffies;
3619 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3620
3621 /*
3622 * If the changed mtu during down is lower than
3623 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3624 */
3625 if (dev->mtu < IPV6_MIN_MTU)
60abc0be 3626 addrconf_ifdown(dev, dev != net->loopback_dev);
1da177e4
LT		 3627 }
3628 break;
3629
1da177e4
LT		 3630 case NETDEV_DOWN:
3631 case NETDEV_UNREGISTER:
3632 /*
3633 * Remove all addresses from this interface.
3634 */
3635 addrconf_ifdown(dev, event != NETDEV_DOWN);
3636 break;
3c21edbd 3637
1da177e4 3638 case NETDEV_CHANGENAME:
1da177e4 3639 if (idev) {
5632c515 3640 snmp6_unregister_dev(idev);
408c4768 3641 addrconf_sysctl_unregister(idev);
a317a2f1 3642 err = addrconf_sysctl_register(idev);
b217d616
HX		 3643 if (err)
3644 return notifier_from_errno(err);
a317a2f1
WC		 3645 err = snmp6_register_dev(idev);
3646 if (err) {
3647 addrconf_sysctl_unregister(idev);
3648 return notifier_from_errno(err);
3649 }
5632c515 3650 }
1da177e4 3651 break;
bcdd553f 3652
93d9b7d7
JP		 3653 case NETDEV_PRE_TYPE_CHANGE:
3654 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3655 if (idev)
3656 addrconf_type_change(dev, event);
75c78500 3657 break;
4f7f34ea
DA		 3658
3659 case NETDEV_CHANGEUPPER:
3660 info = ptr;
3661
3662 /* flush all routes if dev is linked to or unlinked from
3663 * an L3 master device (e.g., VRF)
3664 */
3665 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3666 addrconf_ifdown(dev, 0);
3ff50b79 3667 }
1da177e4
LT		 3668
3669 return NOTIFY_OK;
3670}
3671
3672/*
3673 * addrconf module should be notified of a device going up
3674 */
3675static struct notifier_block ipv6_dev_notf = {
3676 .notifier_call = addrconf_notify,
242d3a49 3677 .priority = ADDRCONF_NOTIFY_PRIORITY,
1da177e4
LT		 3678};
3679
93d9b7d7 3680static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3681{
3682 struct inet6_dev *idev;
3683 ASSERT_RTNL();
3684
3685 idev = __in6_dev_get(dev);
3686
93d9b7d7 3687 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3688 ipv6_mc_remap(idev);
93d9b7d7 3689 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3690 ipv6_mc_unmap(idev);
3691}
3692
70af921d
DA		 3693static bool addr_is_local(const struct in6_addr *addr)
3694{
3695 return ipv6_addr_type(addr) &
3696 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3697}
3698
1da177e4
LT		 3699static int addrconf_ifdown(struct net_device *dev, int how)
3700{
4c981e28 3701 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN;
c346dca1 3702 struct net *net = dev_net(dev);
502a2ffd 3703 struct inet6_dev *idev;
f1705ec1 3704 struct inet6_ifaddr *ifa, *tmp;
0aef78aa 3705 bool keep_addr = false;
73a8bd74 3706 int state, i;
1da177e4
LT		 3707
3708 ASSERT_RTNL();
3709
4c981e28 3710 rt6_disable_ip(dev, event);
1da177e4
LT		 3711
3712 idev = __in6_dev_get(dev);
63159f29 3713 if (!idev)
1da177e4
LT		 3714 return -ENODEV;
3715
bcdd553f
SH		 3716 /*
3717 * Step 1: remove reference to ipv6 device from parent device.
3718 * Do not dev_put!
1da177e4 3719 */
439e2385 3720 if (how) {
1da177e4 3721 idev->dead = 1;
8814c4b5
YH		 3722
3723 /* protected by rtnl_lock */
a9b3cd7f 3724 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3725
3726 /* Step 1.5: remove snmp6 entry */
3727 snmp6_unregister_dev(idev);
3728
3729 }
3730
f1705ec1
DA		 3731 /* combine the user config with event to determine if permanent
3732 * addresses are to be removed from address hash table
3733 */
0aef78aa
IV		 3734 if (!how && !idev->cnf.disable_ipv6) {
3735 /* aggregate the system setting and interface setting */
3736 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3737
3738 if (!_keep_addr)
3739 _keep_addr = idev->cnf.keep_addr_on_down;
3740
3741 keep_addr = (_keep_addr > 0);
3742 }
f1705ec1 3743
73a8bd74
DM		 3744 /* Step 2: clear hash table */
3745 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3746 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3747
3748 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3749restart:
b67bfe0d 3750 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3751 if (ifa->idev == idev) {
c15b1cca 3752 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3753 /* combined flag + permanent flag decide if
3754 * address is retained on a down event
3755 */
3756 if (!keep_addr ||
70af921d
DA		 3757 !(ifa->flags & IFA_F_PERMANENT) ||
3758 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3759 hlist_del_init_rcu(&ifa->addr_lst);
3760 goto restart;
3761 }
73a8bd74
DM		 3762 }
3763 }
3764 spin_unlock_bh(&addrconf_hash_lock);
3765 }
3766
1da177e4
LT		 3767 write_lock_bh(&idev->lock);
3768
b7b1bfce
HFS		 3769 addrconf_del_rs_timer(idev);
3770
bcdd553f 3771 /* Step 2: clear flags for stateless addrconf */
439e2385 3772 if (!how)
3c21edbd 3773 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3774
bcdd553f 3775 /* Step 3: clear tempaddr list */
372e6c8f 3776 while (!list_empty(&idev->tempaddr_list)) {
3777 ifa = list_first_entry(&idev->tempaddr_list,
3778 struct inet6_ifaddr, tmp_list);
3779 list_del(&ifa->tmp_list);
1da177e4
LT		 3780 write_unlock_bh(&idev->lock);
3781 spin_lock_bh(&ifa->lock);
3782
3783 if (ifa->ifpub) {
3784 in6_ifa_put(ifa->ifpub);
3785 ifa->ifpub = NULL;
3786 }
3787 spin_unlock_bh(&ifa->lock);
3788 in6_ifa_put(ifa);
3789 write_lock_bh(&idev->lock);
3790 }
8f37ada5 3791
f1705ec1 3792 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
8d1c802b 3793 struct fib6_info *rt = NULL;
a2d6cbb0 3794 bool keep;
38bd10c4 3795
f1705ec1 3796 addrconf_del_dad_work(ifa);
84e8b803 3797
a2d6cbb0
RV		 3798 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3799 !addr_is_local(&ifa->addr);
a2d6cbb0 3800
73a8bd74 3801 write_unlock_bh(&idev->lock);
8e8e676d 3802 spin_lock_bh(&ifa->lock);
f1705ec1 3803
a2d6cbb0 3804 if (keep) {
f1705ec1
DA		 3805 /* set state to skip the notifier below */
3806 state = INET6_IFADDR_STATE_DEAD;
6d717134 3807 ifa->state = INET6_IFADDR_STATE_PREDAD;
f1705ec1
DA		 3808 if (!(ifa->flags & IFA_F_NODAD))
3809 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3810
3811 rt = ifa->rt;
3812 ifa->rt = NULL;
f1705ec1
DA		 3813 } else {
3814 state = ifa->state;
3815 ifa->state = INET6_IFADDR_STATE_DEAD;
f1705ec1
DA		 3816 }
3817
8e8e676d 3818 spin_unlock_bh(&ifa->lock);
9d82ca98 3819
38bd10c4 3820 if (rt)
afb1d4b5 3821 ip6_del_rt(net, rt);
38bd10c4 3822
73a8bd74
DM		 3823 if (state != INET6_IFADDR_STATE_DEAD) {
3824 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3825 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
ea06f717
MM		 3826 } else {
3827 if (idev->cnf.forwarding)
3828 addrconf_leave_anycast(ifa);
3829 addrconf_leave_solict(ifa->idev, &ifa->addr);
27bdb2ab 3830 }
8f37ada5 3831
73a8bd74 3832 write_lock_bh(&idev->lock);
8ef802aa
ED		 3833 if (!keep) {
3834 list_del_rcu(&ifa->if_list);
3835 in6_ifa_put(ifa);
3836 }
73a8bd74 3837 }
8f37ada5 3838
1da177e4
LT		 3839 write_unlock_bh(&idev->lock);
3840
381f4dca
SD		 3841 /* Step 5: Discard anycast and multicast list */
3842 if (how) {
3843 ipv6_ac_destroy_dev(idev);
1da177e4 3844 ipv6_mc_destroy_dev(idev);
381f4dca 3845 } else {
1da177e4 3846 ipv6_mc_down(idev);
381f4dca 3847 }
1da177e4 3848
1da177e4 3849 idev->tstamp = jiffies;
1ab1457c 3850
bcdd553f 3851 /* Last: Shot the device (if unregistered) */
439e2385 3852 if (how) {
408c4768 3853 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3854 neigh_parms_release(&nd_tbl, idev->nd_parms);
3855 neigh_ifdown(&nd_tbl, dev);
3856 in6_dev_put(idev);
3857 }
3858 return 0;
3859}
3860
e99e88a9 3861static void addrconf_rs_timer(struct timer_list *t)
1da177e4 3862{
e99e88a9 3863 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
caf92bc4 3864 struct net_device *dev = idev->dev;
b7b1bfce 3865 struct in6_addr lladdr;
1da177e4 3866
b7b1bfce 3867 write_lock(&idev->lock);
5b2a1953 3868 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3869 goto out;
3870
9ba2add3 3871 if (!ipv6_accept_ra(idev))
5b2a1953 3872 goto out;
3873
3874 /* Announcement received after solicitation was sent */
3875 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3876 goto out;
1da177e4 3877
bd11f074 3878 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
caf92bc4
CW		 3879 write_unlock(&idev->lock);
3880 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3881 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3882 &in6addr_linklocal_allrouters);
3883 else
caf92bc4 3884 goto put;
1da177e4 3885
caf92bc4 3886 write_lock(&idev->lock);
bd11f074
MŻ		 3887 idev->rs_interval = rfc3315_s14_backoff_update(
3888 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
b7b1bfce
HFS		 3889 /* The wait after the last probe can be shorter */
3890 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3891 idev->cnf.rtr_solicits) ?
3892 idev->cnf.rtr_solicit_delay :
bd11f074 3893 idev->rs_interval);
1da177e4 3894 } else {
1da177e4
LT		 3895 /*
3896 * Note: we do not support deprecated "all on-link"
3897 * assumption any longer.
3898 */
91df42be 3899 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3900 }
3901
3902out:
b7b1bfce 3903 write_unlock(&idev->lock);
caf92bc4 3904put:
b7b1bfce 3905 in6_dev_put(idev);
1da177e4
LT		 3906}
3907
3908/*
3909 * Duplicate Address Detection
3910 */
3c21edbd
YH		 3911static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3912{
3913 unsigned long rand_num;
3914 struct inet6_dev *idev = ifp->idev;
adc176c5 3915 u64 nonce;
3c21edbd 3916
95c385b4
NH		 3917 if (ifp->flags & IFA_F_OPTIMISTIC)
3918 rand_num = 0;
3919 else
63862b5b 3920 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3921
adc176c5
EN		 3922 nonce = 0;
3923 if (idev->cnf.enhanced_dad ||
3924 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3925 do
3926 get_random_bytes(&nonce, 6);
3927 while (nonce == 0);
3928 }
3929 ifp->dad_nonce = nonce;
b7b1bfce 3930 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3931 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3932}
3933
c15b1cca 3934static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3935{
3936 struct inet6_dev *idev = ifp->idev;
3937 struct net_device *dev = idev->dev;
764d3be6 3938 bool bump_id, notify = false;
afb1d4b5 3939 struct net *net;
1da177e4
LT		 3940
3941 addrconf_join_solict(dev, &ifp->addr);
3942
63862b5b 3943 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3944
3945 read_lock_bh(&idev->lock);
622ccdf1 3946 spin_lock(&ifp->lock);
e9d3e084 3947 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3948 goto out;
1da177e4 3949
afb1d4b5 3950 net = dev_net(dev);
1da177e4 3951 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
afb1d4b5 3952 (net->ipv6.devconf_all->accept_dad < 1 &&
a2d3f3e3 3953 idev->cnf.accept_dad < 1) ||
55ebaef1
NT		 3954 !(ifp->flags&IFA_F_TENTATIVE) ||
3955 ifp->flags & IFA_F_NODAD) {
c76fe2d9
DA		 3956 bool send_na = false;
3957
3958 if (ifp->flags & IFA_F_TENTATIVE &&
3959 !(ifp->flags & IFA_F_OPTIMISTIC))
3960 send_na = true;
764d3be6 3961 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3962 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3963 spin_unlock(&ifp->lock);
1da177e4
LT		 3964 read_unlock_bh(&idev->lock);
3965
c76fe2d9 3966 addrconf_dad_completed(ifp, bump_id, send_na);
1da177e4
LT		 3967 return;
3968 }
3969
6732bade 3970 if (!(idev->if_flags & IF_READY)) {
21809faf 3971 spin_unlock(&ifp->lock);
6732bade 3972 read_unlock_bh(&idev->lock);
3c21edbd 3973 /*
590a9887 3974 * If the device is not ready:
3c21edbd
YH		 3975 * - keep it tentative if it is a permanent address.
3976 * - otherwise, kill it.
3977 */
3978 in6_ifa_hold(ifp);
cc411d0b 3979 addrconf_dad_stop(ifp, 0);
6732bade 3980 return;
3c21edbd 3981 }
95c385b4
NH		 3982
3983 /*
3984 * Optimistic nodes can start receiving
3985 * Frames right away
3986 */
7fd2561e 3987 if (ifp->flags & IFA_F_OPTIMISTIC) {
afb1d4b5
DA		 3988 ip6_ins_rt(net, ifp->rt);
3989 if (ipv6_use_optimistic_addr(net, idev)) {
7fd2561e
EK		 3990 /* Because optimistic nodes can use this address,
3991 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3992 */
16186a82 3993 notify = true;
7fd2561e
EK		 3994 }
3995 }
95c385b4 3996
6732bade 3997 addrconf_dad_kick(ifp);
1da177e4 3998out:
622ccdf1 3999 spin_unlock(&ifp->lock);
1da177e4 4000 read_unlock_bh(&idev->lock);
16186a82
SAK		 4001 if (notify)
4002 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 4003}
4004
c15b1cca 4005static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 4006{
c15b1cca
HFS		 4007 bool begin_dad = false;
4008
8e8e676d 4009 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 4010 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4011 ifp->state = INET6_IFADDR_STATE_PREDAD;
4012 begin_dad = true;
4013 }
8e8e676d 4014 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 4015
4016 if (begin_dad)
4017 addrconf_mod_dad_work(ifp, 0);
4018}
4019
4020static void addrconf_dad_work(struct work_struct *w)
4021{
4022 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4023 struct inet6_ifaddr,
4024 dad_work);
1da177e4 4025 struct inet6_dev *idev = ifp->idev;
764d3be6 4026 bool bump_id, disable_ipv6 = false;
1da177e4
LT		 4027 struct in6_addr mcaddr;
4028
c15b1cca
HFS		 4029 enum {
4030 DAD_PROCESS,
4031 DAD_BEGIN,
4032 DAD_ABORT,
4033 } action = DAD_PROCESS;
4034
4035 rtnl_lock();
4036
8e8e676d 4037 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 4038 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4039 action = DAD_BEGIN;
4040 ifp->state = INET6_IFADDR_STATE_DAD;
4041 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4042 action = DAD_ABORT;
4043 ifp->state = INET6_IFADDR_STATE_POSTDAD;
85b51b12 4044
35e015e1
MC		 4045 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4046 idev->cnf.accept_dad > 1) &&
4047 !idev->cnf.disable_ipv6 &&
85b51b12
MM		 4048 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4049 struct in6_addr addr;
4050
4051 addr.s6_addr32[0] = htonl(0xfe800000);
4052 addr.s6_addr32[1] = 0;
4053
4054 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4055 ipv6_addr_equal(&ifp->addr, &addr)) {
4056 /* DAD failed for link-local based on MAC */
4057 idev->cnf.disable_ipv6 = 1;
4058
4059 pr_info("%s: IPv6 being disabled!\n",
4060 ifp->idev->dev->name);
4061 disable_ipv6 = true;
4062 }
4063 }
c15b1cca 4064 }
8e8e676d 4065 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 4066
4067 if (action == DAD_BEGIN) {
4068 addrconf_dad_begin(ifp);
4069 goto out;
4070 } else if (action == DAD_ABORT) {
751eb6b6 4071 in6_ifa_hold(ifp);
c15b1cca 4072 addrconf_dad_stop(ifp, 1);
85b51b12
MM		 4073 if (disable_ipv6)
4074 addrconf_ifdown(idev->dev, 0);
c15b1cca
HFS		 4075 goto out;
4076 }
4077
b7b1bfce 4078 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 4079 goto out;
4080
c15b1cca 4081 write_lock_bh(&idev->lock);
122e4519 4082 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 4083 write_unlock_bh(&idev->lock);
1da177e4
LT		 4084 goto out;
4085 }
21809faf 4086
4087 spin_lock(&ifp->lock);
622ccdf1
HX		 4088 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4089 spin_unlock(&ifp->lock);
c15b1cca 4090 write_unlock_bh(&idev->lock);
622ccdf1
HX		 4091 goto out;
4092 }
4093
b7b1bfce 4094 if (ifp->dad_probes == 0) {
c76fe2d9
DA		 4095 bool send_na = false;
4096
1da177e4
LT		 4097 /*
4098 * DAD was successful
4099 */
4100
c76fe2d9
DA		 4101 if (ifp->flags & IFA_F_TENTATIVE &&
4102 !(ifp->flags & IFA_F_OPTIMISTIC))
4103 send_na = true;
764d3be6 4104 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 4105 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 4106 spin_unlock(&ifp->lock);
c15b1cca 4107 write_unlock_bh(&idev->lock);
1da177e4 4108
c76fe2d9 4109 addrconf_dad_completed(ifp, bump_id, send_na);
1da177e4
LT		 4110
4111 goto out;
4112 }
4113
b7b1bfce 4114 ifp->dad_probes--;
c15b1cca
HFS		 4115 addrconf_mod_dad_work(ifp,
4116 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 4117 spin_unlock(&ifp->lock);
c15b1cca 4118 write_unlock_bh(&idev->lock);
1da177e4
LT		 4119
4120 /* send a neighbour solicitation for our addr */
1da177e4 4121 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
adc176c5
EN		 4122 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4123 ifp->dad_nonce);
1da177e4
LT		 4124out:
4125 in6_ifa_put(ifp);
c15b1cca 4126 rtnl_unlock();
1da177e4
LT		 4127}
4128
11ffff75
HFS		 4129/* ifp->idev must be at least read locked */
4130static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4131{
4132 struct inet6_ifaddr *ifpiter;
4133 struct inet6_dev *idev = ifp->idev;
4134
602582ca
HFS		 4135 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4136 if (ifpiter->scope > IFA_LINK)
4137 break;
11ffff75
HFS		 4138 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4139 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4140 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4141 IFA_F_PERMANENT)
4142 return false;
4143 }
4144 return true;
4145}
4146
c76fe2d9
DA		 4147static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4148 bool send_na)
1da177e4 4149{
e21e8467 4150 struct net_device *dev = ifp->idev->dev;
b7b1bfce 4151 struct in6_addr lladdr;
b173ee48 4152 bool send_rs, send_mld;
b7b1bfce 4153
c15b1cca 4154 addrconf_del_dad_work(ifp);
1da177e4
LT		 4155
4156 /*
4157 * Configure the address for reception. Now it is valid.
4158 */
4159
4160 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4161
026359bc
TA		 4162 /* If added prefix is link local and we are prepared to process
4163 router advertisements, start sending router solicitations.
1da177e4
LT		 4164 */
4165
1ec047eb 4166 read_lock_bh(&ifp->idev->lock);
11ffff75 4167 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 4168 send_rs = send_mld &&
4169 ipv6_accept_ra(ifp->idev) &&
bd11f074 4170 ifp->idev->cnf.rtr_solicits != 0 &&
b173ee48 4171 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 4172 read_unlock_bh(&ifp->idev->lock);
4173
b173ee48
HFS		 4174 /* While dad is in progress mld report's source address is in6_addrany.
4175 * Resend with proper ll now.
4176 */
4177 if (send_mld)
4178 ipv6_mc_dad_complete(ifp->idev);
4179
c76fe2d9
DA		 4180 /* send unsolicited NA if enabled */
4181 if (send_na &&
4182 (ifp->idev->cnf.ndisc_notify ||
4183 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4184 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4185 /*router=*/ !!ifp->idev->cnf.forwarding,
4186 /*solicited=*/ false, /*override=*/ true,
4187 /*inc_opt=*/ true);
4188 }
4189
1ec047eb 4190 if (send_rs) {
1da177e4
LT		 4191 /*
4192 * If a host as already performed a random delay
4193 * [...] as part of DAD [...] there is no need
4194 * to delay again before sending the first RS
4195 */
1ec047eb 4196 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 4197 return;
1ec047eb 4198 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 4199
b7b1bfce
HFS		 4200 write_lock_bh(&ifp->idev->lock);
4201 spin_lock(&ifp->lock);
bd11f074
MŻ		 4202 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4203 ifp->idev->cnf.rtr_solicit_interval);
b7b1bfce 4204 ifp->idev->rs_probes = 1;
1da177e4 4205 ifp->idev->if_flags |= IF_RS_SENT;
bd11f074 4206 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
b7b1bfce
HFS		 4207 spin_unlock(&ifp->lock);
4208 write_unlock_bh(&ifp->idev->lock);
1da177e4 4209 }
764d3be6
PA		 4210
4211 if (bump_id)
4212 rt_genid_bump_ipv6(dev_net(dev));
a11a7f71
MH		 4213
4214 /* Make sure that a new temporary address will be created
4215 * before this temporary address becomes deprecated.
4216 */
4217 if (ifp->flags & IFA_F_TEMPORARY)
4218 addrconf_verify_rtnl();
1da177e4
LT		 4219}
4220
896585d4 4221static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
e21e8467 4222{
c5e33bdd
YH		 4223 struct inet6_ifaddr *ifp;
4224
4225 read_lock_bh(&idev->lock);
502a2ffd 4226 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 4227 spin_lock(&ifp->lock);
896585d4
HL		 4228 if ((ifp->flags & IFA_F_TENTATIVE &&
4229 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4230 if (restart)
4231 ifp->state = INET6_IFADDR_STATE_PREDAD;
f2344a13 4232 addrconf_dad_kick(ifp);
896585d4 4233 }
21809faf 4234 spin_unlock(&ifp->lock);
c5e33bdd
YH		 4235 }
4236 read_unlock_bh(&idev->lock);
4237}
4238
1da177e4
LT		 4239#ifdef CONFIG_PROC_FS
4240struct if6_iter_state {
3c40090a 4241 struct seq_net_private p;
1da177e4 4242 int bucket;
1d578303 4243 int offset;
1da177e4
LT		 4244};
4245
1d578303 4246static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4 4247{
1da177e4 4248 struct if6_iter_state *state = seq->private;
1218854a 4249 struct net *net = seq_file_net(seq);
a5c1d98f 4250 struct inet6_ifaddr *ifa = NULL;
1d578303 4251 int p = 0;
1da177e4 4252
1d578303
MM		 4253 /* initial bucket if pos is 0 */
4254 if (pos == 0) {
4255 state->bucket = 0;
4256 state->offset = 0;
4257 }
4258
4259 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
a5c1d98f 4260 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
1d578303 4261 addr_lst) {
9f0d3c27
ED		 4262 if (!net_eq(dev_net(ifa->idev->dev), net))
4263 continue;
1d578303
MM		 4264 /* sync with offset */
4265 if (p < state->offset) {
4266 p++;
4267 continue;
4268 }
9f0d3c27 4269 return ifa;
1d578303
MM		 4270 }
4271
4272 /* prepare for next bucket */
4273 state->offset = 0;
4274 p = 0;
1da177e4 4275 }
c2e21293 4276 return NULL;
1da177e4
LT		 4277}
4278
c2e21293 4279static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4280 struct inet6_ifaddr *ifa)
1da177e4
LT		 4281{
4282 struct if6_iter_state *state = seq->private;
1218854a 4283 struct net *net = seq_file_net(seq);
1da177e4 4284
a5c1d98f 4285 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
9f0d3c27
ED		 4286 if (!net_eq(dev_net(ifa->idev->dev), net))
4287 continue;
1d578303 4288 state->offset++;
9f0d3c27 4289 return ifa;
1d578303 4290 }
3c40090a 4291
86f9bd1f 4292 state->offset = 0;
c2e21293 4293 while (++state->bucket < IN6_ADDR_HSIZE) {
a5c1d98f 4294 hlist_for_each_entry_rcu(ifa,
c2e21293 4295 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 4296 if (!net_eq(dev_net(ifa->idev->dev), net))
4297 continue;
9f0d3c27 4298 return ifa;
c2e21293 4299 }
1da177e4 4300 }
3c40090a 4301
c2e21293 4302 return NULL;
1da177e4
LT		 4303}
4304
1da177e4 4305static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
a5c1d98f 4306 __acquires(rcu)
1da177e4 4307{
a5c1d98f 4308 rcu_read_lock();
1d578303 4309 return if6_get_first(seq, *pos);
1da177e4
LT		 4310}
4311
4312static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4313{
4314 struct inet6_ifaddr *ifa;
4315
4316 ifa = if6_get_next(seq, v);
4317 ++*pos;
4318 return ifa;
4319}
4320
4321static void if6_seq_stop(struct seq_file *seq, void *v)
a5c1d98f 4322 __releases(rcu)
1da177e4 4323{
a5c1d98f 4324 rcu_read_unlock();
1da177e4
LT		 4325}
4326
4327static int if6_seq_show(struct seq_file *seq, void *v)
4328{
4329 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4330 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4331 &ifp->addr,
1da177e4
LT		 4332 ifp->idev->dev->ifindex,
4333 ifp->prefix_len,
4334 ifp->scope,
971a351c 4335 (u8) ifp->flags,
1da177e4
LT		 4336 ifp->idev->dev->name);
4337 return 0;
4338}
4339
56b3d975 4340static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4341 .start = if6_seq_start,
4342 .next = if6_seq_next,
4343 .show = if6_seq_show,
4344 .stop = if6_seq_stop,
4345};
4346
2c8c1e72 4347static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4348{
c3506372
CH		 4349 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4350 sizeof(struct if6_iter_state)))
1da177e4
LT		 4351 return -ENOMEM;
4352 return 0;
4353}
4354
2c8c1e72 4355static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4356{
ece31ffd 4357 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4358}
4359
4360static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4361 .init = if6_proc_net_init,
4362 .exit = if6_proc_net_exit,
3c40090a
DL		 4363};
4364
4365int __init if6_proc_init(void)
4366{
4367 return register_pernet_subsys(&if6_proc_net_ops);
4368}
4369
1da177e4
LT		 4370void if6_proc_exit(void)
4371{
3c40090a 4372 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4373}
4374#endif /* CONFIG_PROC_FS */
4375
07a93626 4376#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4377/* Check if address is a home address configured on any interface. */
b71d1d42 4378int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c 4379{
3f27fb23 4380 unsigned int hash = inet6_addr_hash(net, addr);
c2e21293 4381 struct inet6_ifaddr *ifp = NULL;
3f27fb23 4382 int ret = 0;
c2e21293 4383
4e5f47ab
ED		 4384 rcu_read_lock();
4385 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 4386 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 4387 continue;
caad295f 4388 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4389 (ifp->flags & IFA_F_HOMEADDRESS)) {
4390 ret = 1;
4391 break;
4392 }
4393 }
4e5f47ab 4394 rcu_read_unlock();
3b9f9a1c
NT		 4395 return ret;
4396}
4397#endif
4398
1da177e4
LT		 4399/*
4400 * Periodic address status verification
4401 */
4402
c15b1cca 4403static void addrconf_verify_rtnl(void)
1da177e4 4404{
b2db7564 4405 unsigned long now, next, next_sec, next_sched;
1da177e4 4406 struct inet6_ifaddr *ifp;
1da177e4
LT		 4407 int i;
4408
c15b1cca
HFS		 4409 ASSERT_RTNL();
4410
5c578aed 4411 rcu_read_lock_bh();
1da177e4 4412 now = jiffies;
b2db7564 4413 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4414
c15b1cca 4415 cancel_delayed_work(&addr_chk_work);
1da177e4 4416
bcdd553f 4417 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4418restart:
c15b1cca 4419 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 4420 unsigned long age;
1da177e4 4421
fad8da3e
YA		 4422 /* When setting preferred_lft to a value not zero or
4423 * infinity, while valid_lft is infinity
4424 * IFA_F_PERMANENT has a non-infinity life time.
4425 */
4426 if ((ifp->flags & IFA_F_PERMANENT) &&
4427 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4428 continue;
4429
4430 spin_lock(&ifp->lock);
b2db7564
YH		 4431 /* We try to batch several events at once. */
4432 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4433
8f27ebb9
YH		 4434 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4435 age >= ifp->valid_lft) {
1da177e4
LT		 4436 spin_unlock(&ifp->lock);
4437 in6_ifa_hold(ifp);
1da177e4
LT		 4438 ipv6_del_addr(ifp);
4439 goto restart;
8f27ebb9
YH		 4440 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4441 spin_unlock(&ifp->lock);
4442 continue;
1da177e4 4443 } else if (age >= ifp->prefered_lft) {
a1ed0526 4444 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4445 int deprecate = 0;
4446
4447 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4448 deprecate = 1;
4449 ifp->flags |= IFA_F_DEPRECATED;
4450 }
4451
fad8da3e
YA		 4452 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4453 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4454 next = ifp->tstamp + ifp->valid_lft * HZ;
4455
4456 spin_unlock(&ifp->lock);
4457
4458 if (deprecate) {
4459 in6_ifa_hold(ifp);
1da177e4
LT		 4460
4461 ipv6_ifa_notify(0, ifp);
4462 in6_ifa_put(ifp);
4463 goto restart;
4464 }
1da177e4
LT		 4465 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4466 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4467 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4468 ifp->idev->cnf.dad_transmits *
1f9248e5 4469 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 4470
1da177e4
LT		 4471 if (age >= ifp->prefered_lft - regen_advance) {
4472 struct inet6_ifaddr *ifpub = ifp->ifpub;
4473 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4474 next = ifp->tstamp + ifp->prefered_lft * HZ;
4475 if (!ifp->regen_count && ifpub) {
4476 ifp->regen_count++;
4477 in6_ifa_hold(ifp);
4478 in6_ifa_hold(ifpub);
4479 spin_unlock(&ifp->lock);
5c578aed 4480
291d809b
HY		 4481 spin_lock(&ifpub->lock);
4482 ifpub->regen_count = 0;
4483 spin_unlock(&ifpub->lock);
e64e469b 4484 rcu_read_unlock_bh();
fffcefe9 4485 ipv6_create_tempaddr(ifpub, ifp, true);
1da177e4
LT		 4486 in6_ifa_put(ifpub);
4487 in6_ifa_put(ifp);
e64e469b 4488 rcu_read_lock_bh();
1da177e4
LT		 4489 goto restart;
4490 }
4491 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4492 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4493 spin_unlock(&ifp->lock);
1da177e4
LT		 4494 } else {
4495 /* ifp->prefered_lft <= ifp->valid_lft */
4496 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4497 next = ifp->tstamp + ifp->prefered_lft * HZ;
4498 spin_unlock(&ifp->lock);
4499 }
4500 }
1da177e4
LT		 4501 }
4502
b2db7564
YH		 4503 next_sec = round_jiffies_up(next);
4504 next_sched = next;
4505
4506 /* If rounded timeout is accurate enough, accept it. */
4507 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4508 next_sched = next_sec;
4509
4510 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4511 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4512 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4513
e32ac250
JP		 4514 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4515 now, next, next_sec, next_sched);
c15b1cca 4516 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4517 rcu_read_unlock_bh();
1da177e4
LT		 4518}
4519
c15b1cca
HFS		 4520static void addrconf_verify_work(struct work_struct *w)
4521{
4522 rtnl_lock();
4523 addrconf_verify_rtnl();
4524 rtnl_unlock();
4525}
4526
4527static void addrconf_verify(void)
4528{
4529 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4530}
4531
caeaba79
ND		 4532static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4533 struct in6_addr **peer_pfx)
461d8837
TG		 4534{
4535 struct in6_addr *pfx = NULL;
4536
caeaba79
ND		 4537 *peer_pfx = NULL;
4538
461d8837
TG		 4539 if (addr)
4540 pfx = nla_data(addr);
4541
4542 if (local) {
4543 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4544 *peer_pfx = pfx;
4545 pfx = nla_data(local);
461d8837
TG		 4546 }
4547
4548 return pfx;
4549}
4550
ef7c79ed 4551static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4552 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4553 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4554 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4555 [IFA_FLAGS] = { .len = sizeof(u32) },
8308f3ff 4556 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
6ecf4c37 4557 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
461d8837
TG		 4558};
4559
1da177e4 4560static int
c21ef3e3
DA		 4561inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4562 struct netlink_ext_ack *extack)
1da177e4 4563{
3b1e0a65 4564 struct net *net = sock_net(skb->sk);
b933f716
TG		 4565 struct ifaddrmsg *ifm;
4566 struct nlattr *tb[IFA_MAX+1];
caeaba79 4567 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4568 u32 ifa_flags;
b933f716 4569 int err;
1da177e4 4570
8cb08174
JB		 4571 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4572 ifa_ipv6_policy, extack);
b933f716
TG		 4573 if (err < 0)
4574 return err;
4575
4576 ifm = nlmsg_data(nlh);
caeaba79 4577 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4578 if (!pfx)
1da177e4
LT		 4579 return -EINVAL;
4580
6046d5b4
HK		 4581 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4582
4583 /* We ignore other flags so far. */
4584 ifa_flags &= IFA_F_MANAGETEMPADDR;
4585
4586 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4587 ifm->ifa_prefixlen);
1da177e4
LT		 4588}
4589
8308f3ff 4590static int modify_prefix_route(struct inet6_ifaddr *ifp,
61794012
HL		 4591 unsigned long expires, u32 flags,
4592 bool modify_peer)
8308f3ff
DA		 4593{
4594 struct fib6_info *f6i;
e7c7faa9 4595 u32 prio;
8308f3ff 4596
61794012
HL		 4597 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4598 ifp->prefix_len,
2b2450ca 4599 ifp->idev->dev, 0, RTF_DEFAULT, true);
8308f3ff
DA		 4600 if (!f6i)
4601 return -ENOENT;
4602
e7c7faa9
DA		 4603 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4604 if (f6i->fib6_metric != prio) {
4605 /* delete old one */
4606 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
4607
8308f3ff 4608 /* add new one */
61794012
HL		 4609 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4610 ifp->prefix_len,
8308f3ff
DA		 4611 ifp->rt_priority, ifp->idev->dev,
4612 expires, flags, GFP_KERNEL);
8308f3ff
DA		 4613 } else {
4614 if (!expires)
4615 fib6_clean_expires(f6i);
4616 else
4617 fib6_set_expires(f6i, expires);
4618
4619 fib6_info_release(f6i);
4620 }
4621
4622 return 0;
4623}
4624
d169a1f8 4625static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
081bba5b 4626{
6f704992
YH		 4627 u32 flags;
4628 clock_t expires;
4bed72e4 4629 unsigned long timeout;
53bd6749 4630 bool was_managetempaddr;
5b84efec 4631 bool had_prefixroute;
d0098e4c 4632 bool new_peer = false;
46d48046 4633
c15b1cca
HFS		 4634 ASSERT_RTNL();
4635
d169a1f8 4636 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
081bba5b
NT		 4637 return -EINVAL;
4638
d169a1f8 4639 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
53bd6749
JP		 4640 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4641 return -EINVAL;
4642
f1c02cfb 4643 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
d169a1f8 4644 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
f1c02cfb 4645
d169a1f8 4646 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4bed72e4
YH		 4647 if (addrconf_finite_timeout(timeout)) {
4648 expires = jiffies_to_clock_t(timeout * HZ);
d169a1f8 4649 cfg->valid_lft = timeout;
6f704992 4650 flags = RTF_EXPIRES;
4bed72e4
YH		 4651 } else {
4652 expires = 0;
4653 flags = 0;
d169a1f8 4654 cfg->ifa_flags |= IFA_F_PERMANENT;
6f704992 4655 }
081bba5b 4656
d169a1f8 4657 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4bed72e4
YH		 4658 if (addrconf_finite_timeout(timeout)) {
4659 if (timeout == 0)
d169a1f8
DA		 4660 cfg->ifa_flags |= IFA_F_DEPRECATED;
4661 cfg->preferred_lft = timeout;
4bed72e4 4662 }
081bba5b 4663
d0098e4c
HL		 4664 if (cfg->peer_pfx &&
4665 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4666 if (!ipv6_addr_any(&ifp->peer_addr))
4667 cleanup_prefix_route(ifp, expires, true, true);
4668 new_peer = true;
4669 }
4670
081bba5b 4671 spin_lock_bh(&ifp->lock);
53bd6749 4672 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4673 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4674 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4675 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4676 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4677 IFA_F_NOPREFIXROUTE);
d169a1f8 4678 ifp->flags |= cfg->ifa_flags;
081bba5b 4679 ifp->tstamp = jiffies;
d169a1f8
DA		 4680 ifp->valid_lft = cfg->valid_lft;
4681 ifp->prefered_lft = cfg->preferred_lft;
081bba5b 4682
8308f3ff
DA		 4683 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4684 ifp->rt_priority = cfg->rt_priority;
081bba5b 4685
d0098e4c
HL		 4686 if (new_peer)
4687 ifp->peer_addr = *cfg->peer_pfx;
4688
081bba5b
NT		 4689 spin_unlock_bh(&ifp->lock);
4690 if (!(ifp->flags&IFA_F_TENTATIVE))
4691 ipv6_ifa_notify(0, ifp);
081bba5b 4692
d169a1f8 4693 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
8308f3ff
DA		 4694 int rc = -ENOENT;
4695
4696 if (had_prefixroute)
61794012 4697 rc = modify_prefix_route(ifp, expires, flags, false);
8308f3ff
DA		 4698
4699 /* prefix route could have been deleted; if so restore it */
4700 if (rc == -ENOENT) {
4701 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4702 ifp->rt_priority, ifp->idev->dev,
4703 expires, flags, GFP_KERNEL);
4704 }
61794012
HL		 4705
4706 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4707 rc = modify_prefix_route(ifp, expires, flags, true);
4708
4709 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4710 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4711 ifp->rt_priority, ifp->idev->dev,
4712 expires, flags, GFP_KERNEL);
4713 }
5b84efec
TH		 4714 } else if (had_prefixroute) {
4715 enum cleanup_prefix_rt_t action;
4716 unsigned long rt_expires;
4717
4718 write_lock_bh(&ifp->idev->lock);
4719 action = check_cleanup_prefix_route(ifp, &rt_expires);
4720 write_unlock_bh(&ifp->idev->lock);
4721
4722 if (action != CLEANUP_PREFIX_RT_NOP) {
4723 cleanup_prefix_route(ifp, rt_expires,
d0098e4c 4724 action == CLEANUP_PREFIX_RT_DEL, false);
5b84efec 4725 }
761aac73 4726 }
53bd6749
JP		 4727
4728 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
d169a1f8
DA		 4729 if (was_managetempaddr &&
4730 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4731 cfg->valid_lft = 0;
4732 cfg->preferred_lft = 0;
4733 }
4734 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4735 cfg->preferred_lft, !was_managetempaddr,
4736 jiffies);
53bd6749
JP		 4737 }
4738
c15b1cca 4739 addrconf_verify_rtnl();
081bba5b
NT		 4740
4741 return 0;
4742}
4743
1da177e4 4744static int
c21ef3e3
DA		 4745inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4746 struct netlink_ext_ack *extack)
1da177e4 4747{
3b1e0a65 4748 struct net *net = sock_net(skb->sk);
461d8837
TG		 4749 struct ifaddrmsg *ifm;
4750 struct nlattr *tb[IFA_MAX+1];
19b1518c 4751 struct in6_addr *peer_pfx;
7198f8ce
TG		 4752 struct inet6_ifaddr *ifa;
4753 struct net_device *dev;
f1c02cfb 4754 struct inet6_dev *idev;
19b1518c 4755 struct ifa6_config cfg;
461d8837 4756 int err;
1da177e4 4757
8cb08174
JB		 4758 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4759 ifa_ipv6_policy, extack);
461d8837
TG		 4760 if (err < 0)
4761 return err;
4762
19b1518c
DA		 4763 memset(&cfg, 0, sizeof(cfg));
4764
461d8837 4765 ifm = nlmsg_data(nlh);
19b1518c
DA		 4766 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4767 if (!cfg.pfx)
1da177e4
LT		 4768 return -EINVAL;
4769
19b1518c
DA		 4770 cfg.peer_pfx = peer_pfx;
4771 cfg.plen = ifm->ifa_prefixlen;
8308f3ff
DA		 4772 if (tb[IFA_RT_PRIORITY])
4773 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4774
19b1518c
DA		 4775 cfg.valid_lft = INFINITY_LIFE_TIME;
4776 cfg.preferred_lft = INFINITY_LIFE_TIME;
4777
461d8837 4778 if (tb[IFA_CACHEINFO]) {
0778769d 4779 struct ifa_cacheinfo *ci;
461d8837
TG		 4780
4781 ci = nla_data(tb[IFA_CACHEINFO]);
19b1518c
DA		 4782 cfg.valid_lft = ci->ifa_valid;
4783 cfg.preferred_lft = ci->ifa_prefered;
0778769d
NT		 4784 }
4785
af284937 4786 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4787 if (!dev)
7198f8ce
TG		 4788 return -ENODEV;
4789
19b1518c
DA		 4790 if (tb[IFA_FLAGS])
4791 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4792 else
4793 cfg.ifa_flags = ifm->ifa_flags;
479840ff 4794
55ebaef1 4795 /* We ignore other flags so far. */
19b1518c
DA		 4796 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4797 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4798 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
f1c02cfb
SD		 4799
4800 idev = ipv6_find_idev(dev);
db0b99f5
SD		 4801 if (IS_ERR(idev))
4802 return PTR_ERR(idev);
f1c02cfb
SD		 4803
4804 if (!ipv6_allow_optimistic_dad(net, idev))
19b1518c 4805 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
f1c02cfb 4806
19b1518c
DA		 4807 if (cfg.ifa_flags & IFA_F_NODAD &&
4808 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
f1c02cfb
SD		 4809 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4810 return -EINVAL;
4811 }
55ebaef1 4812
19b1518c 4813 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
63159f29 4814 if (!ifa) {
7198f8ce
TG		 4815 /*
4816 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4817 * userspace already relies on not having to provide this.
7198f8ce 4818 */
19b1518c 4819 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
081bba5b
NT		 4820 }
4821
7198f8ce
TG		 4822 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4823 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4824 err = -EEXIST;
4825 else
d169a1f8 4826 err = inet6_addr_modify(ifa, &cfg);
7198f8ce
TG		 4827
4828 in6_ifa_put(ifa);
4829
4830 return err;
1da177e4
LT		 4831}
4832
479840ff 4833static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4834 u8 scope, int ifindex)
4835{
4836 struct ifaddrmsg *ifm;
4837
4838 ifm = nlmsg_data(nlh);
4839 ifm->ifa_family = AF_INET6;
4840 ifm->ifa_prefixlen = prefixlen;
4841 ifm->ifa_flags = flags;
4842 ifm->ifa_scope = scope;
4843 ifm->ifa_index = ifindex;
4844}
4845
85486af0
TG		 4846static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4847 unsigned long tstamp, u32 preferred, u32 valid)
4848{
4849 struct ifa_cacheinfo ci;
4850
18a31e1e
TG		 4851 ci.cstamp = cstamp_delta(cstamp);
4852 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4853 ci.ifa_prefered = preferred;
4854 ci.ifa_valid = valid;
4855
4856 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4857}
4858
101bb229
TG		 4859static inline int rt_scope(int ifa_scope)
4860{
4861 if (ifa_scope & IFA_HOST)
4862 return RT_SCOPE_HOST;
4863 else if (ifa_scope & IFA_LINK)
4864 return RT_SCOPE_LINK;
4865 else if (ifa_scope & IFA_SITE)
4866 return RT_SCOPE_SITE;
4867 else
4868 return RT_SCOPE_UNIVERSE;
4869}
4870
0ab6803b
TG		 4871static inline int inet6_ifaddr_msgsize(void)
4872{
339bf98f 4873 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4874 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4875 + nla_total_size(16) /* IFA_ADDRESS */
479840ff 4876 + nla_total_size(sizeof(struct ifa_cacheinfo))
8308f3ff
DA		 4877 + nla_total_size(4) /* IFA_FLAGS */
4878 + nla_total_size(4) /* IFA_RT_PRIORITY */;
0ab6803b 4879}
c5396a31 4880
6ba1e6e8
DA		 4881enum addr_type_t {
4882 UNICAST_ADDR,
4883 MULTICAST_ADDR,
4884 ANYCAST_ADDR,
4885};
4886
203651b6
CB		 4887struct inet6_fill_args {
4888 u32 portid;
4889 u32 seq;
4890 int event;
4891 unsigned int flags;
4892 int netnsid;
6371a71f 4893 int ifindex;
6ba1e6e8 4894 enum addr_type_t type;
203651b6
CB		 4895};
4896
1da177e4 4897static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
203651b6 4898 struct inet6_fill_args *args)
1da177e4 4899{
1da177e4 4900 struct nlmsghdr *nlh;
85486af0 4901 u32 preferred, valid;
1da177e4 4902
203651b6
CB		 4903 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4904 sizeof(struct ifaddrmsg), args->flags);
63159f29 4905 if (!nlh)
26932566 4906 return -EMSGSIZE;
0ab6803b 4907
101bb229
TG		 4908 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4909 ifa->idev->dev->ifindex);
4910
203651b6
CB		 4911 if (args->netnsid >= 0 &&
4912 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
6ecf4c37
CB		 4913 goto error;
4914
fad8da3e
YA		 4915 if (!((ifa->flags&IFA_F_PERMANENT) &&
4916 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4917 preferred = ifa->prefered_lft;
4918 valid = ifa->valid_lft;
4919 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4920 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4921 if (preferred > tval)
4922 preferred -= tval;
4923 else
4924 preferred = 0;
f56619fc
BH		 4925 if (valid != INFINITY_LIFE_TIME) {
4926 if (valid > tval)
4927 valid -= tval;
4928 else
4929 valid = 0;
4930 }
1da177e4
LT		 4931 }
4932 } else {
85486af0
TG		 4933 preferred = INFINITY_LIFE_TIME;
4934 valid = INFINITY_LIFE_TIME;
4935 }
4936
7996c799 4937 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4938 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4939 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4940 goto error;
4941 } else
930345ea 4942 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4943 goto error;
4944
8308f3ff
DA		 4945 if (ifa->rt_priority &&
4946 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
4947 goto error;
4948
caeaba79
ND		 4949 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4950 goto error;
1da177e4 4951
479840ff
JP		 4952 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4953 goto error;
4954
053c095a
JB		 4955 nlmsg_end(skb, nlh);
4956 return 0;
caeaba79
ND		 4957
4958error:
4959 nlmsg_cancel(skb, nlh);
4960 return -EMSGSIZE;
1da177e4
LT		 4961}
4962
4963static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
203651b6 4964 struct inet6_fill_args *args)
1da177e4 4965{
1da177e4 4966 struct nlmsghdr *nlh;
101bb229
TG		 4967 u8 scope = RT_SCOPE_UNIVERSE;
4968 int ifindex = ifmca->idev->dev->ifindex;
4969
4970 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4971 scope = RT_SCOPE_SITE;
1da177e4 4972
203651b6
CB		 4973 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4974 sizeof(struct ifaddrmsg), args->flags);
63159f29 4975 if (!nlh)
26932566 4976 return -EMSGSIZE;
85486af0 4977
203651b6
CB		 4978 if (args->netnsid >= 0 &&
4979 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
6ecf4c37
CB		 4980 return -EMSGSIZE;
4981
0ab6803b 4982 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4983 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4984 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4985 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4986 nlmsg_cancel(skb, nlh);
4987 return -EMSGSIZE;
4988 }
85486af0 4989
053c095a
JB		 4990 nlmsg_end(skb, nlh);
4991 return 0;
1da177e4
LT		 4992}
4993
4994static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
203651b6 4995 struct inet6_fill_args *args)
1da177e4 4996{
9ee8cbb2
DA		 4997 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
4998 int ifindex = dev ? dev->ifindex : 1;
1da177e4 4999 struct nlmsghdr *nlh;
101bb229 5000 u8 scope = RT_SCOPE_UNIVERSE;
101bb229
TG		 5001
5002 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5003 scope = RT_SCOPE_SITE;
1da177e4 5004
203651b6
CB		 5005 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5006 sizeof(struct ifaddrmsg), args->flags);
63159f29 5007 if (!nlh)
26932566 5008 return -EMSGSIZE;
85486af0 5009
203651b6
CB		 5010 if (args->netnsid >= 0 &&
5011 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
6ecf4c37
CB		 5012 return -EMSGSIZE;
5013
0ab6803b 5014 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 5015 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 5016 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 5017 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5018 nlmsg_cancel(skb, nlh);
5019 return -EMSGSIZE;
5020 }
1da177e4 5021
053c095a
JB		 5022 nlmsg_end(skb, nlh);
5023 return 0;
1da177e4
LT		 5024}
5025
234b27c3
ED		 5026/* called with rcu_read_lock() */
5027static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
fe884c2b 5028 struct netlink_callback *cb, int s_ip_idx,
6ba1e6e8 5029 struct inet6_fill_args *fillargs)
234b27c3 5030{
234b27c3
ED		 5031 struct ifmcaddr6 *ifmca;
5032 struct ifacaddr6 *ifaca;
fe884c2b 5033 int ip_idx = 0;
234b27c3 5034 int err = 1;
234b27c3
ED		 5035
5036 read_lock_bh(&idev->lock);
6ba1e6e8 5037 switch (fillargs->type) {
502a2ffd 5038 case UNICAST_ADDR: {
5039 struct inet6_ifaddr *ifa;
6ba1e6e8 5040 fillargs->event = RTM_NEWADDR;
502a2ffd 5041
234b27c3 5042 /* unicast address incl. temp addr */
502a2ffd 5043 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4ba4c566
DA		 5044 if (ip_idx < s_ip_idx)
5045 goto next;
6ba1e6e8 5046 err = inet6_fill_ifaddr(skb, ifa, fillargs);
053c095a 5047 if (err < 0)
234b27c3 5048 break;
63998ac2 5049 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4ba4c566
DA		 5050next:
5051 ip_idx++;
234b27c3
ED		 5052 }
5053 break;
502a2ffd 5054 }
234b27c3 5055 case MULTICAST_ADDR:
6ba1e6e8 5056 fillargs->event = RTM_GETMULTICAST;
203651b6 5057
234b27c3
ED		 5058 /* multicast address */
5059 for (ifmca = idev->mc_list; ifmca;
5060 ifmca = ifmca->next, ip_idx++) {
5061 if (ip_idx < s_ip_idx)
5062 continue;
6ba1e6e8 5063 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
053c095a 5064 if (err < 0)
234b27c3
ED		 5065 break;
5066 }
5067 break;
5068 case ANYCAST_ADDR:
6ba1e6e8 5069 fillargs->event = RTM_GETANYCAST;
234b27c3
ED		 5070 /* anycast address */
5071 for (ifaca = idev->ac_list; ifaca;
5072 ifaca = ifaca->aca_next, ip_idx++) {
5073 if (ip_idx < s_ip_idx)
5074 continue;
6ba1e6e8 5075 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
053c095a 5076 if (err < 0)
234b27c3
ED		 5077 break;
5078 }
5079 break;
5080 default:
5081 break;
5082 }
5083 read_unlock_bh(&idev->lock);
fe884c2b 5084 cb->args[2] = ip_idx;
234b27c3
ED		 5085 return err;
5086}
5087
ed6eff11
DA		 5088static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5089 struct inet6_fill_args *fillargs,
5090 struct net **tgt_net, struct sock *sk,
6371a71f 5091 struct netlink_callback *cb)
ed6eff11 5092{
6371a71f 5093 struct netlink_ext_ack *extack = cb->extack;
ed6eff11
DA		 5094 struct nlattr *tb[IFA_MAX+1];
5095 struct ifaddrmsg *ifm;
5096 int err, i;
5097
5098 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5099 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5100 return -EINVAL;
5101 }
5102
5103 ifm = nlmsg_data(nlh);
5104 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5105 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5106 return -EINVAL;
5107 }
6371a71f
DA		 5108
5109 fillargs->ifindex = ifm->ifa_index;
5110 if (fillargs->ifindex) {
5111 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5112 fillargs->flags |= NLM_F_DUMP_FILTERED;
ed6eff11
DA		 5113 }
5114
8cb08174
JB		 5115 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5116 ifa_ipv6_policy, extack);
ed6eff11
DA		 5117 if (err < 0)
5118 return err;
5119
5120 for (i = 0; i <= IFA_MAX; ++i) {
5121 if (!tb[i])
5122 continue;
5123
5124 if (i == IFA_TARGET_NETNSID) {
5125 struct net *net;
5126
5127 fillargs->netnsid = nla_get_s32(tb[i]);
5128 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5129 if (IS_ERR(net)) {
bf4cc40e 5130 fillargs->netnsid = -1;
ed6eff11
DA		 5131 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5132 return PTR_ERR(net);
5133 }
5134 *tgt_net = net;
5135 } else {
5136 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5137 return -EINVAL;
5138 }
5139 }
5140
5141 return 0;
5142}
5143
1da177e4
LT		 5144static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5145 enum addr_type_t type)
5146{
ed6eff11 5147 const struct nlmsghdr *nlh = cb->nlh;
6ba1e6e8
DA		 5148 struct inet6_fill_args fillargs = {
5149 .portid = NETLINK_CB(cb->skb).portid,
5150 .seq = cb->nlh->nlmsg_seq,
5151 .flags = NLM_F_MULTI,
5152 .netnsid = -1,
5153 .type = type,
5154 };
234b27c3 5155 struct net *net = sock_net(skb->sk);
6ecf4c37 5156 struct net *tgt_net = net;
fe884c2b 5157 int idx, s_idx, s_ip_idx;
234b27c3 5158 int h, s_h;
1da177e4 5159 struct net_device *dev;
234b27c3
ED		 5160 struct inet6_dev *idev;
5161 struct hlist_head *head;
242afaa6 5162 int err = 0;
1ab1457c 5163
234b27c3
ED		 5164 s_h = cb->args[0];
5165 s_idx = idx = cb->args[1];
fe884c2b 5166 s_ip_idx = cb->args[2];
5d5619b4 5167
ed6eff11 5168 if (cb->strict_check) {
ed6eff11 5169 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
6371a71f 5170 skb->sk, cb);
ed6eff11 5171 if (err < 0)
242afaa6 5172 goto put_tgt_net;
6371a71f 5173
242afaa6 5174 err = 0;
6371a71f
DA		 5175 if (fillargs.ifindex) {
5176 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
242afaa6
DA		 5177 if (!dev) {
5178 err = -ENODEV;
5179 goto put_tgt_net;
5180 }
6371a71f
DA		 5181 idev = __in6_dev_get(dev);
5182 if (idev) {
5183 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5184 &fillargs);
1518039f
JK		 5185 if (err > 0)
5186 err = 0;
6371a71f
DA		 5187 }
5188 goto put_tgt_net;
5189 }
6ecf4c37
CB		 5190 }
5191
234b27c3 5192 rcu_read_lock();
6ecf4c37 5193 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
234b27c3
ED		 5194 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5195 idx = 0;
6ecf4c37 5196 head = &tgt_net->dev_index_head[h];
b67bfe0d 5197 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 5198 if (idx < s_idx)
5199 goto cont;
4b97efdf 5200 if (h > s_h || idx > s_idx)
234b27c3 5201 s_ip_idx = 0;
e21e8467
SH		 5202 idev = __in6_dev_get(dev);
5203 if (!idev)
234b27c3
ED		 5204 goto cont;
5205
fe884c2b 5206 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
6ba1e6e8 5207 &fillargs) < 0)
234b27c3 5208 goto done;
7562f876 5209cont:
234b27c3
ED		 5210 idx++;
5211 }
1da177e4 5212 }
234b27c3
ED		 5213done:
5214 rcu_read_unlock();
5215 cb->args[0] = h;
5216 cb->args[1] = idx;
6371a71f 5217put_tgt_net:
6ba1e6e8 5218 if (fillargs.netnsid >= 0)
6ecf4c37 5219 put_net(tgt_net);
234b27c3 5220
7c1e8a38 5221 return skb->len ? : err;
1da177e4
LT		 5222}
5223
5224static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5225{
5226 enum addr_type_t type = UNICAST_ADDR;
b854272b 5227
1da177e4
LT		 5228 return inet6_dump_addr(skb, cb, type);
5229}
5230
5231static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5232{
5233 enum addr_type_t type = MULTICAST_ADDR;
b854272b 5234
1da177e4
LT		 5235 return inet6_dump_addr(skb, cb, type);
5236}
5237
5238
5239static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5240{
5241 enum addr_type_t type = ANYCAST_ADDR;
b854272b 5242
1da177e4
LT		 5243 return inet6_dump_addr(skb, cb, type);
5244}
5245
4b1373de
JK		 5246static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5247 const struct nlmsghdr *nlh,
5248 struct nlattr **tb,
5249 struct netlink_ext_ack *extack)
5250{
5251 struct ifaddrmsg *ifm;
5252 int i, err;
5253
5254 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5255 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5256 return -EINVAL;
5257 }
5258
2beb6d29
HL		 5259 if (!netlink_strict_get_check(skb))
5260 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5261 ifa_ipv6_policy, extack);
5262
4b1373de
JK		 5263 ifm = nlmsg_data(nlh);
5264 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5265 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5266 return -EINVAL;
5267 }
5268
8cb08174
JB		 5269 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5270 ifa_ipv6_policy, extack);
4b1373de
JK		 5271 if (err)
5272 return err;
5273
5274 for (i = 0; i <= IFA_MAX; i++) {
5275 if (!tb[i])
5276 continue;
5277
5278 switch (i) {
5279 case IFA_TARGET_NETNSID:
5280 case IFA_ADDRESS:
5281 case IFA_LOCAL:
5282 break;
5283 default:
5284 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5285 return -EINVAL;
5286 }
5287 }
5288
5289 return 0;
5290}
5291
c21ef3e3
DA		 5292static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5293 struct netlink_ext_ack *extack)
6c223828 5294{
3b1e0a65 5295 struct net *net = sock_net(in_skb->sk);
203651b6
CB		 5296 struct inet6_fill_args fillargs = {
5297 .portid = NETLINK_CB(in_skb).portid,
5298 .seq = nlh->nlmsg_seq,
5299 .event = RTM_NEWADDR,
5300 .flags = 0,
5301 .netnsid = -1,
5302 };
6ecf4c37 5303 struct net *tgt_net = net;
1b29fc2c
TG		 5304 struct ifaddrmsg *ifm;
5305 struct nlattr *tb[IFA_MAX+1];
caeaba79 5306 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 5307 struct net_device *dev = NULL;
5308 struct inet6_ifaddr *ifa;
5309 struct sk_buff *skb;
6c223828
NT		 5310 int err;
5311
4b1373de 5312 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
1b29fc2c 5313 if (err < 0)
c24675f8 5314 return err;
1b29fc2c 5315
6ecf4c37 5316 if (tb[IFA_TARGET_NETNSID]) {
203651b6 5317 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
6ecf4c37
CB		 5318
5319 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
203651b6 5320 fillargs.netnsid);
6ecf4c37
CB		 5321 if (IS_ERR(tgt_net))
5322 return PTR_ERR(tgt_net);
5323 }
5324
caeaba79 5325 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
c24675f8
FW		 5326 if (!addr)
5327 return -EINVAL;
6c223828 5328
1b29fc2c 5329 ifm = nlmsg_data(nlh);
6c223828 5330 if (ifm->ifa_index)
6ecf4c37 5331 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
6c223828 5332
6ecf4c37 5333 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
e21e8467 5334 if (!ifa) {
1b29fc2c
TG		 5335 err = -EADDRNOTAVAIL;
5336 goto errout;
5337 }
6c223828 5338
e21e8467
SH		 5339 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5340 if (!skb) {
6c223828 5341 err = -ENOBUFS;
1b29fc2c 5342 goto errout_ifa;
6c223828
NT		 5343 }
5344
203651b6 5345 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
26932566
PM		 5346 if (err < 0) {
5347 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5348 WARN_ON(err == -EMSGSIZE);
5349 kfree_skb(skb);
5350 goto errout_ifa;
5351 }
6ecf4c37 5352 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
1b29fc2c 5353errout_ifa:
6c223828 5354 in6_ifa_put(ifa);
1b29fc2c 5355errout:
c24675f8
FW		 5356 if (dev)
5357 dev_put(dev);
203651b6 5358 if (fillargs.netnsid >= 0)
6ecf4c37
CB		 5359 put_net(tgt_net);
5360
6c223828 5361 return err;
6c223828
NT		 5362}
5363
1da177e4
LT		 5364static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5365{
5366 struct sk_buff *skb;
c346dca1 5367 struct net *net = dev_net(ifa->idev->dev);
203651b6
CB		 5368 struct inet6_fill_args fillargs = {
5369 .portid = 0,
5370 .seq = 0,
5371 .event = event,
5372 .flags = 0,
5373 .netnsid = -1,
5374 };
5d620266 5375 int err = -ENOBUFS;
1da177e4 5376
0ab6803b 5377 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 5378 if (!skb)
5d620266
TG		 5379 goto errout;
5380
203651b6 5381 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
26932566
PM		 5382 if (err < 0) {
5383 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5384 WARN_ON(err == -EMSGSIZE);
5385 kfree_skb(skb);
5386 goto errout;
5387 }
1ce85fe4
PNA		 5388 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5389 return;
5d620266
TG		 5390errout:
5391 if (err < 0)
6fda7350 5392 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 5393}
5394
b6f99a21 5395static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 5396 __s32 *array, int bytes)
5397{
04561c1f
TG		 5398 BUG_ON(bytes < (DEVCONF_MAX * 4));
5399
1da177e4
LT		 5400 memset(array, 0, bytes);
5401 array[DEVCONF_FORWARDING] = cnf->forwarding;
5402 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5403 array[DEVCONF_MTU6] = cnf->mtu6;
5404 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5405 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5406 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5407 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5408 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 5409 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5410 jiffies_to_msecs(cnf->rtr_solicit_interval);
bd11f074
MŻ		 5411 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5412 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
93908d19
TG		 5413 array[DEVCONF_RTR_SOLICIT_DELAY] =
5414 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 5415 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 5416 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5417 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5418 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5419 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 5420 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5421 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5422 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5423 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5424 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 5425 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 5426 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 5427 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 5428 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 5429#ifdef CONFIG_IPV6_ROUTER_PREF
5430 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 5431 array[DEVCONF_RTR_PROBE_INTERVAL] =
5432 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 5433#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 5434 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
09c884d4
YH		 5435 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5436#endif
930d6ff2 5437#endif
fbea49e1 5438 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 5439 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 5440#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5441 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 5442 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 5443#endif
7bc570c8
YH		 5444#ifdef CONFIG_IPV6_MROUTE
5445 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5446#endif
778d80be 5447 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 5448 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 5449 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 5450 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 5451 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 5452 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 5453 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 5454 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 5455 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 5456 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 5457 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 5458 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 5459 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1ababeba 5460 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
bf355b8d
DL		 5461#ifdef CONFIG_IPV6_SEG6_HMAC
5462 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5463#endif
adc176c5 5464 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
d35a00b8 5465 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
df789fe7 5466 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
2210d6b2 5467 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
1da177e4
LT		 5468}
5469
b382b191
TG		 5470static inline size_t inet6_ifla6_size(void)
5471{
5472 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5473 + nla_total_size(sizeof(struct ifla_cacheinfo))
5474 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5475 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4 5476 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
bdd72f41
SD		 5477 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5478 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5479 + 0;
b382b191
TG		 5480}
5481
339bf98f
TG		 5482static inline size_t inet6_if_nlmsg_size(void)
5483{
5484 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5485 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5486 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5487 + nla_total_size(4) /* IFLA_MTU */
5488 + nla_total_size(4) /* IFLA_LINK */
0344338b 5489 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 5490 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 5491}
c5396a31 5492
be281e55 5493static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
aca05671 5494 int bytes)
7f7d9a6b
HX		 5495{
5496 int i;
aca05671 5497 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
7f7d9a6b
HX		 5498 BUG_ON(pad < 0);
5499
5500 /* Use put_unaligned() because stats may not be aligned for u64. */
aca05671
JH		 5501 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5502 for (i = 1; i < ICMP6_MIB_MAX; i++)
be281e55 5503 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b 5504
aca05671 5505 memset(&stats[ICMP6_MIB_MAX], 0, pad);
7f7d9a6b
HX		 5506}
5507
698365fa 5508static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 5509 int bytes, size_t syncpoff)
4ce3c183 5510{
a3a77372
R		 5511 int i, c;
5512 u64 buff[IPSTATS_MIB_MAX];
5513 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5514
4ce3c183
ED		 5515 BUG_ON(pad < 0);
5516
a3a77372
R		 5517 memset(buff, 0, sizeof(buff));
5518 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 5519
a3a77372
R		 5520 for_each_possible_cpu(c) {
5521 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5522 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5523 }
5524
5525 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5526 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 5527}
5528
7f7d9a6b
HX		 5529static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5530 int bytes)
5531{
e21e8467 5532 switch (attrtype) {
7f7d9a6b 5533 case IFLA_INET6_STATS:
a3a77372
R		 5534 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5535 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 5536 break;
5537 case IFLA_INET6_ICMP6STATS:
aca05671 5538 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
7f7d9a6b
HX		 5539 break;
5540 }
5541}
5542
d5566fd7
SV		 5543static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5544 u32 ext_filter_mask)
b382b191
TG		 5545{
5546 struct nlattr *nla;
5547 struct ifla_cacheinfo ci;
5548
c78679e8
DM		 5549 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5550 goto nla_put_failure;
b382b191 5551 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 5552 ci.tstamp = cstamp_delta(idev->tstamp);
5553 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 5554 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 5555 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5556 goto nla_put_failure;
b382b191 5557 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 5558 if (!nla)
b382b191
TG		 5559 goto nla_put_failure;
5560 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5561
5562 /* XXX - MC not implemented */
5563
d5566fd7
SV		 5564 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5565 return 0;
5566
b382b191 5567 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 5568 if (!nla)
b382b191
TG		 5569 goto nla_put_failure;
5570 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5571
5572 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 5573 if (!nla)
b382b191
TG		 5574 goto nla_put_failure;
5575 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5576
f53adae4 5577 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 5578 if (!nla)
f53adae4
DB		 5579 goto nla_put_failure;
5580 read_lock_bh(&idev->lock);
5581 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5582 read_unlock_bh(&idev->lock);
5583
0d7982ce
ND		 5584 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5585 goto nla_put_failure;
5586
b382b191
TG		 5587 return 0;
5588
5589nla_put_failure:
5590 return -EMSGSIZE;
5591}
5592
b1974ed0
AR		 5593static size_t inet6_get_link_af_size(const struct net_device *dev,
5594 u32 ext_filter_mask)
b382b191
TG		 5595{
5596 if (!__in6_dev_get(dev))
5597 return 0;
5598
5599 return inet6_ifla6_size();
5600}
5601
d5566fd7
SV		 5602static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5603 u32 ext_filter_mask)
b382b191
TG		 5604{
5605 struct inet6_dev *idev = __in6_dev_get(dev);
5606
5607 if (!idev)
5608 return -ENODATA;
5609
d5566fd7 5610 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5611 return -EMSGSIZE;
5612
5613 return 0;
5614}
5615
f53adae4
DB		 5616static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5617{
f53adae4
DB		 5618 struct inet6_ifaddr *ifp;
5619 struct net_device *dev = idev->dev;
47e27d5e 5620 bool clear_token, update_rs = false;
dc848292 5621 struct in6_addr ll_addr;
f53adae4 5622
c15b1cca
HFS		 5623 ASSERT_RTNL();
5624
63159f29 5625 if (!token)
f53adae4 5626 return -EINVAL;
f53adae4
DB		 5627 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5628 return -EINVAL;
f53adae4
DB		 5629 if (!ipv6_accept_ra(idev))
5630 return -EINVAL;
bd11f074 5631 if (idev->cnf.rtr_solicits == 0)
f53adae4
DB		 5632 return -EINVAL;
5633
5634 write_lock_bh(&idev->lock);
5635
5636 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5637 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5638
5639 write_unlock_bh(&idev->lock);
5640
47e27d5e
DB		 5641 clear_token = ipv6_addr_any(token);
5642 if (clear_token)
5643 goto update_lft;
5644
dc848292
HFS		 5645 if (!idev->dead && (idev->if_flags & IF_READY) &&
5646 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5647 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5648 /* If we're not ready, then normal ifup will take care
5649 * of this. Otherwise, we need to request our rs here.
5650 */
5651 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5652 update_rs = true;
5653 }
f53adae4 5654
47e27d5e 5655update_lft:
f53adae4 5656 write_lock_bh(&idev->lock);
fc403832 5657
77ecaace 5658 if (update_rs) {
fc403832 5659 idev->if_flags |= IF_RS_SENT;
bd11f074
MŻ		 5660 idev->rs_interval = rfc3315_s14_backoff_init(
5661 idev->cnf.rtr_solicit_interval);
77ecaace 5662 idev->rs_probes = 1;
bd11f074 5663 addrconf_mod_rs_timer(idev, idev->rs_interval);
77ecaace 5664 }
f53adae4
DB		 5665
5666 /* Well, that's kinda nasty ... */
5667 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5668 spin_lock(&ifp->lock);
617fe29d 5669 if (ifp->tokenized) {
f53adae4
DB		 5670 ifp->valid_lft = 0;
5671 ifp->prefered_lft = 0;
5672 }
5673 spin_unlock(&ifp->lock);
5674 }
5675
5676 write_unlock_bh(&idev->lock);
b2ed64a9 5677 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 5678 addrconf_verify_rtnl();
f53adae4
DB		 5679 return 0;
5680}
5681
11b1f828
DB		 5682static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5683 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5684 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5685};
5686
d35a00b8
FJ		 5687static int check_addr_gen_mode(int mode)
5688{
5689 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5690 mode != IN6_ADDR_GEN_MODE_NONE &&
5691 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5692 mode != IN6_ADDR_GEN_MODE_RANDOM)
5693 return -EINVAL;
5694 return 1;
5695}
5696
5697static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5698 int mode)
5699{
5700 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5701 !idev->cnf.stable_secret.initialized &&
5702 !net->ipv6.devconf_dflt->stable_secret.initialized)
5703 return -EINVAL;
5704 return 1;
5705}
5706
7dc2bcca
MM		 5707static int inet6_validate_link_af(const struct net_device *dev,
5708 const struct nlattr *nla)
5709{
5710 struct nlattr *tb[IFLA_INET6_MAX + 1];
5711 struct inet6_dev *idev = NULL;
5712 int err;
5713
5714 if (dev) {
5715 idev = __in6_dev_get(dev);
5716 if (!idev)
5717 return -EAFNOSUPPORT;
5718 }
5719
5720 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5721 inet6_af_policy, NULL);
5722 if (err)
5723 return err;
5724
5725 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5726 return -EINVAL;
5727
5728 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5729 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5730
5731 if (check_addr_gen_mode(mode) < 0)
5732 return -EINVAL;
5733 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5734 return -EINVAL;
5735 }
5736
5737 return 0;
5738}
5739
f53adae4
DB		 5740static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5741{
f53adae4
DB		 5742 struct inet6_dev *idev = __in6_dev_get(dev);
5743 struct nlattr *tb[IFLA_INET6_MAX + 1];
7dc2bcca 5744 int err;
f53adae4 5745
db3fa271
ED		 5746 if (!idev)
5747 return -EAFNOSUPPORT;
5748
8cb08174 5749 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
f53adae4
DB		 5750 BUG();
5751
bc91b0f0 5752 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 5753 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 5754 if (err)
5755 return err;
5756 }
5757
5758 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5759 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5760
d35a00b8 5761 idev->cnf.addr_gen_mode = mode;
bc91b0f0 5762 }
f53adae4 5763
7dc2bcca 5764 return 0;
f53adae4
DB		 5765}
5766
1ab1457c 5767static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5768 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5769{
04561c1f 5770 struct net_device *dev = idev->dev;
04561c1f
TG		 5771 struct ifinfomsg *hdr;
5772 struct nlmsghdr *nlh;
5773 void *protoinfo;
04561c1f 5774
15e47304 5775 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5776 if (!nlh)
26932566 5777 return -EMSGSIZE;
04561c1f
TG		 5778
5779 hdr = nlmsg_data(nlh);
5780 hdr->ifi_family = AF_INET6;
5781 hdr->__ifi_pad = 0;
5782 hdr->ifi_type = dev->type;
5783 hdr->ifi_index = dev->ifindex;
5784 hdr->ifi_flags = dev_get_flags(dev);
5785 hdr->ifi_change = 0;
5786
c78679e8
DM		 5787 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5788 (dev->addr_len &&
5789 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5790 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5791 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5792 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5793 nla_put_u8(skb, IFLA_OPERSTATE,
5794 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5795 goto nla_put_failure;
ae0be8de 5796 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
63159f29 5797 if (!protoinfo)
04561c1f 5798 goto nla_put_failure;
1da177e4 5799
d5566fd7 5800 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5801 goto nla_put_failure;
1da177e4 5802
04561c1f 5803 nla_nest_end(skb, protoinfo);
053c095a
JB		 5804 nlmsg_end(skb, nlh);
5805 return 0;
1da177e4 5806
04561c1f 5807nla_put_failure:
26932566
PM		 5808 nlmsg_cancel(skb, nlh);
5809 return -EMSGSIZE;
1da177e4
LT		 5810}
5811
786e0007
DA		 5812static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5813 struct netlink_ext_ack *extack)
5814{
5815 struct ifinfomsg *ifm;
5816
5817 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5818 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5819 return -EINVAL;
5820 }
5821
5822 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5823 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5824 return -EINVAL;
5825 }
5826
5827 ifm = nlmsg_data(nlh);
5828 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5829 ifm->ifi_change || ifm->ifi_index) {
5830 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5831 return -EINVAL;
5832 }
5833
5834 return 0;
5835}
5836
1da177e4
LT		 5837static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5838{
3b1e0a65 5839 struct net *net = sock_net(skb->sk);
84d2697d 5840 int h, s_h;
434a8a58 5841 int idx = 0, s_idx;
1da177e4
LT		 5842 struct net_device *dev;
5843 struct inet6_dev *idev;
84d2697d 5844 struct hlist_head *head;
1da177e4 5845
786e0007
DA		 5846 /* only requests using strict checking can pass data to
5847 * influence the dump
5848 */
5849 if (cb->strict_check) {
5850 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
5851
5852 if (err < 0)
5853 return err;
5854 }
5855
84d2697d
ED		 5856 s_h = cb->args[0];
5857 s_idx = cb->args[1];
5858
5859 rcu_read_lock();
5860 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5861 idx = 0;
5862 head = &net->dev_index_head[h];
b67bfe0d 5863 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5864 if (idx < s_idx)
5865 goto cont;
5866 idev = __in6_dev_get(dev);
5867 if (!idev)
5868 goto cont;
5869 if (inet6_fill_ifinfo(skb, idev,
15e47304 5870 NETLINK_CB(cb->skb).portid,
84d2697d 5871 cb->nlh->nlmsg_seq,
053c095a 5872 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5873 goto out;
7562f876 5874cont:
84d2697d
ED		 5875 idx++;
5876 }
1da177e4 5877 }
84d2697d
ED		 5878out:
5879 rcu_read_unlock();
5880 cb->args[1] = idx;
5881 cb->args[0] = h;
1da177e4
LT		 5882
5883 return skb->len;
5884}
5885
5886void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5887{
5888 struct sk_buff *skb;
c346dca1 5889 struct net *net = dev_net(idev->dev);
8d7a76c9 5890 int err = -ENOBUFS;
1ab1457c 5891
339bf98f 5892 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5893 if (!skb)
8d7a76c9
TG		 5894 goto errout;
5895
5896 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5897 if (err < 0) {
5898 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5899 WARN_ON(err == -EMSGSIZE);
5900 kfree_skb(skb);
5901 goto errout;
5902 }
5f75a104 5903 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5904 return;
8d7a76c9
TG		 5905errout:
5906 if (err < 0)
5f75a104 5907 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5908}
5909
339bf98f
TG		 5910static inline size_t inet6_prefix_nlmsg_size(void)
5911{
5912 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5913 + nla_total_size(sizeof(struct in6_addr))
5914 + nla_total_size(sizeof(struct prefix_cacheinfo));
5915}
c5396a31 5916
1da177e4 5917static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5918 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5919 int event, unsigned int flags)
1da177e4 5920{
6051e2f4
TG		 5921 struct prefixmsg *pmsg;
5922 struct nlmsghdr *nlh;
1da177e4
LT		 5923 struct prefix_cacheinfo ci;
5924
15e47304 5925 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5926 if (!nlh)
26932566 5927 return -EMSGSIZE;
6051e2f4
TG		 5928
5929 pmsg = nlmsg_data(nlh);
1da177e4 5930 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5931 pmsg->prefix_pad1 = 0;
5932 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5933 pmsg->prefix_ifindex = idev->dev->ifindex;
5934 pmsg->prefix_len = pinfo->prefix_len;
5935 pmsg->prefix_type = pinfo->type;
8a47077a 5936 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5937 pmsg->prefix_flags = 0;
5938 if (pinfo->onlink)
5939 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5940 if (pinfo->autoconf)
5941 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5942
c78679e8
DM		 5943 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5944 goto nla_put_failure;
1da177e4
LT		 5945 ci.preferred_time = ntohl(pinfo->prefered);
5946 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5947 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5948 goto nla_put_failure;
053c095a
JB		 5949 nlmsg_end(skb, nlh);
5950 return 0;
1da177e4 5951
6051e2f4 5952nla_put_failure:
26932566
PM		 5953 nlmsg_cancel(skb, nlh);
5954 return -EMSGSIZE;
1da177e4
LT		 5955}
5956
1ab1457c 5957static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5958 struct prefix_info *pinfo)
5959{
5960 struct sk_buff *skb;
c346dca1 5961 struct net *net = dev_net(idev->dev);
8c384bfa 5962 int err = -ENOBUFS;
1da177e4 5963
339bf98f 5964 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5965 if (!skb)
8c384bfa
TG		 5966 goto errout;
5967
5968 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5969 if (err < 0) {
5970 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5971 WARN_ON(err == -EMSGSIZE);
5972 kfree_skb(skb);
5973 goto errout;
5974 }
1ce85fe4
PNA		 5975 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5976 return;
8c384bfa
TG		 5977errout:
5978 if (err < 0)
6fda7350 5979 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5980}
5981
1da177e4
LT		 5982static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5983{
63998ac2
ND		 5984 struct net *net = dev_net(ifp->idev->dev);
5985
c15b1cca
HFS		 5986 if (event)
5987 ASSERT_RTNL();
5988
1da177e4
LT		 5989 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5990
5991 switch (event) {
5992 case RTM_NEWADDR:
95c385b4 5993 /*
2d819d25
DA		 5994 * If the address was optimistic we inserted the route at the
5995 * start of our DAD process, so we don't need to do it again.
5996 * If the device was taken down in the middle of the DAD
5997 * cycle there is a race where we could get here without a
5998 * host route, so nothing to insert. That will be fixed when
5999 * the device is brought up.
95c385b4 6000 */
2d819d25 6001 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
afb1d4b5 6002 ip6_ins_rt(net, ifp->rt);
2d819d25
DA		 6003 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6004 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6005 &ifp->addr, ifp->idev->dev->name);
6006 }
6007
1da177e4
LT		 6008 if (ifp->idev->cnf.forwarding)
6009 addrconf_join_anycast(ifp);
7996c799 6010 if (!ipv6_addr_any(&ifp->peer_addr))
07758eb9
HL		 6011 addrconf_prefix_route(&ifp->peer_addr, 128,
6012 ifp->rt_priority, ifp->idev->dev,
6013 0, 0, GFP_ATOMIC);
1da177e4
LT		 6014 break;
6015 case RTM_DELADDR:
6016 if (ifp->idev->cnf.forwarding)
6017 addrconf_leave_anycast(ifp);
6018 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 6019 if (!ipv6_addr_any(&ifp->peer_addr)) {
8d1c802b 6020 struct fib6_info *rt;
caeaba79 6021
e7478dfc 6022 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
2b2450ca
DA		 6023 ifp->idev->dev, 0, 0,
6024 false);
8e3d5be7 6025 if (rt)
afb1d4b5 6026 ip6_del_rt(net, rt);
caeaba79 6027 }
38bd10c4 6028 if (ifp->rt) {
93531c67
DA		 6029 ip6_del_rt(net, ifp->rt);
6030 ifp->rt = NULL;
38bd10c4 6031 }
705f1c86 6032 rt_genid_bump_ipv6(net);
1da177e4
LT		 6033 break;
6034 }
63998ac2 6035 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 6036}
6037
6038static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6039{
8814c4b5 6040 rcu_read_lock_bh();
1da177e4
LT		 6041 if (likely(ifp->idev->dead == 0))
6042 __ipv6_ifa_notify(event, ifp);
8814c4b5 6043 rcu_read_unlock_bh();
1da177e4
LT		 6044}
6045
6046#ifdef CONFIG_SYSCTL
6047
6048static
fe2c6338 6049int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 6050 void __user *buffer, size_t *lenp, loff_t *ppos)
6051{
6052 int *valp = ctl->data;
6053 int val = *valp;
88af182e 6054 loff_t pos = *ppos;
fe2c6338 6055 struct ctl_table lctl;
1da177e4
LT		 6056 int ret;
6057
013d97e9
FR		 6058 /*
6059 * ctl->data points to idev->cnf.forwarding, we should
6060 * not modify it until we get the rtnl lock.
6061 */
6062 lctl = *ctl;
6063 lctl.data = &val;
6064
6065 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 6066
c8fecf22 6067 if (write)
b325fddb 6068 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 6069 if (ret)
6070 *ppos = pos;
1ab1457c 6071 return ret;
1da177e4
LT		 6072}
6073
77751427
ML		 6074static
6075int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6076 void __user *buffer, size_t *lenp, loff_t *ppos)
6077{
6078 struct inet6_dev *idev = ctl->extra1;
6079 int min_mtu = IPV6_MIN_MTU;
6080 struct ctl_table lctl;
6081
6082 lctl = *ctl;
6083 lctl.extra1 = &min_mtu;
6084 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6085
6086 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6087}
6088
56d417b1
BH		 6089static void dev_disable_change(struct inet6_dev *idev)
6090{
75538c2b
CW		 6091 struct netdev_notifier_info info;
6092
56d417b1
BH		 6093 if (!idev || !idev->dev)
6094 return;
6095
75538c2b 6096 netdev_notifier_info_init(&info, idev->dev);
56d417b1 6097 if (idev->cnf.disable_ipv6)
75538c2b 6098 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 6099 else
75538c2b 6100 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 6101}
6102
6103static void addrconf_disable_change(struct net *net, __s32 newf)
6104{
6105 struct net_device *dev;
6106 struct inet6_dev *idev;
6107
03e4deff 6108 for_each_netdev(net, dev) {
56d417b1
BH		 6109 idev = __in6_dev_get(dev);
6110 if (idev) {
6111 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6112 idev->cnf.disable_ipv6 = newf;
6113 if (changed)
6114 dev_disable_change(idev);
6115 }
56d417b1 6116 }
56d417b1
BH		 6117}
6118
013d97e9 6119static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 6120{
6121 struct net *net;
013d97e9
FR		 6122 int old;
6123
6124 if (!rtnl_trylock())
6125 return restart_syscall();
56d417b1
BH		 6126
6127 net = (struct net *)table->extra2;
013d97e9
FR		 6128 old = *p;
6129 *p = newf;
56d417b1 6130
013d97e9
FR		 6131 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6132 rtnl_unlock();
56d417b1 6133 return 0;
88af182e 6134 }
56d417b1
BH		 6135
6136 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 6137 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6138 addrconf_disable_change(net, newf);
013d97e9 6139 } else if ((!newf) ^ (!old))
56d417b1
BH		 6140 dev_disable_change((struct inet6_dev *)table->extra1);
6141
6142 rtnl_unlock();
6143 return 0;
6144}
6145
6146static
fe2c6338 6147int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 6148 void __user *buffer, size_t *lenp, loff_t *ppos)
6149{
6150 int *valp = ctl->data;
6151 int val = *valp;
88af182e 6152 loff_t pos = *ppos;
fe2c6338 6153 struct ctl_table lctl;
56d417b1
BH		 6154 int ret;
6155
013d97e9
FR		 6156 /*
6157 * ctl->data points to idev->cnf.disable_ipv6, we should
6158 * not modify it until we get the rtnl lock.
6159 */
6160 lctl = *ctl;
6161 lctl.data = &val;
6162
6163 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 6164
6165 if (write)
6166 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 6167 if (ret)
6168 *ppos = pos;
56d417b1
BH		 6169 return ret;
6170}
6171
c92d5491 6172static
6173int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6174 void __user *buffer, size_t *lenp, loff_t *ppos)
6175{
6176 int *valp = ctl->data;
6177 int ret;
6178 int old, new;
6179
6180 old = *valp;
6181 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6182 new = *valp;
6183
6184 if (write && old != new) {
6185 struct net *net = ctl->extra2;
6186
6187 if (!rtnl_trylock())
6188 return restart_syscall();
6189
6190 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
85b3daad
DA		 6191 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6192 NETCONFA_PROXY_NEIGH,
c92d5491 6193 NETCONFA_IFINDEX_DEFAULT,
6194 net->ipv6.devconf_dflt);
6195 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
85b3daad
DA		 6196 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6197 NETCONFA_PROXY_NEIGH,
c92d5491 6198 NETCONFA_IFINDEX_ALL,
6199 net->ipv6.devconf_all);
6200 else {
6201 struct inet6_dev *idev = ctl->extra1;
6202
85b3daad
DA		 6203 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6204 NETCONFA_PROXY_NEIGH,
c92d5491 6205 idev->dev->ifindex,
6206 &idev->cnf);
6207 }
6208 rtnl_unlock();
6209 }
6210
6211 return ret;
6212}
6213
d35a00b8
FJ		 6214static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6215 void __user *buffer, size_t *lenp,
6216 loff_t *ppos)
6217{
6218 int ret = 0;
c6dbf7aa 6219 u32 new_val;
d35a00b8
FJ		 6220 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6221 struct net *net = (struct net *)ctl->extra2;
c6dbf7aa
SD		 6222 struct ctl_table tmp = {
6223 .data = &new_val,
6224 .maxlen = sizeof(new_val),
6225 .mode = ctl->mode,
6226 };
d35a00b8 6227
8c171d6c
FJ		 6228 if (!rtnl_trylock())
6229 return restart_syscall();
6230
c6dbf7aa 6231 new_val = *((u32 *)ctl->data);
d35a00b8 6232
c6dbf7aa
SD		 6233 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6234 if (ret != 0)
6235 goto out;
d35a00b8 6236
c6dbf7aa 6237 if (write) {
8c171d6c
FJ		 6238 if (check_addr_gen_mode(new_val) < 0) {
6239 ret = -EINVAL;
6240 goto out;
6241 }
d35a00b8 6242
c6dbf7aa 6243 if (idev) {
8c171d6c
FJ		 6244 if (check_stable_privacy(idev, net, new_val) < 0) {
6245 ret = -EINVAL;
6246 goto out;
6247 }
d35a00b8
FJ		 6248
6249 if (idev->cnf.addr_gen_mode != new_val) {
6250 idev->cnf.addr_gen_mode = new_val;
d35a00b8 6251 addrconf_dev_config(idev->dev);
d35a00b8 6252 }
f24c5987
SD		 6253 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6254 struct net_device *dev;
6255
6256 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6257 for_each_netdev(net, dev) {
6258 idev = __in6_dev_get(dev);
6259 if (idev &&
6260 idev->cnf.addr_gen_mode != new_val) {
6261 idev->cnf.addr_gen_mode = new_val;
6262 addrconf_dev_config(idev->dev);
6263 }
6264 }
d35a00b8 6265 }
c6dbf7aa
SD		 6266
6267 *((u32 *)ctl->data) = new_val;
d35a00b8
FJ		 6268 }
6269
8c171d6c
FJ		 6270out:
6271 rtnl_unlock();
6272
d35a00b8
FJ		 6273 return ret;
6274}
6275
3d1bec99
HFS		 6276static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6277 void __user *buffer, size_t *lenp,
6278 loff_t *ppos)
6279{
6280 int err;
6281 struct in6_addr addr;
6282 char str[IPV6_MAX_STRLEN];
6283 struct ctl_table lctl = *ctl;
622c81d5 6284 struct net *net = ctl->extra2;
3d1bec99
HFS		 6285 struct ipv6_stable_secret *secret = ctl->data;
6286
622c81d5
HFS		 6287 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6288 return -EIO;
6289
3d1bec99
HFS		 6290 lctl.maxlen = IPV6_MAX_STRLEN;
6291 lctl.data = str;
6292
6293 if (!rtnl_trylock())
6294 return restart_syscall();
6295
6296 if (!write && !secret->initialized) {
6297 err = -EIO;
6298 goto out;
6299 }
6300
5449a5ca
WC		 6301 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6302 if (err >= sizeof(str)) {
6303 err = -EIO;
6304 goto out;
3d1bec99
HFS		 6305 }
6306
6307 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6308 if (err || !write)
6309 goto out;
6310
6311 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6312 err = -EIO;
6313 goto out;
6314 }
6315
6316 secret->initialized = true;
6317 secret->secret = addr;
6318
622c81d5
HFS		 6319 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6320 struct net_device *dev;
6321
6322 for_each_netdev(net, dev) {
6323 struct inet6_dev *idev = __in6_dev_get(dev);
6324
6325 if (idev) {
d35a00b8 6326 idev->cnf.addr_gen_mode =
622c81d5
HFS		 6327 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6328 }
6329 }
6330 } else {
6331 struct inet6_dev *idev = ctl->extra1;
6332
d35a00b8 6333 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
622c81d5
HFS		 6334 }
6335
3d1bec99
HFS		 6336out:
6337 rtnl_unlock();
6338
6339 return err;
6340}
c92d5491 6341
35103d11
AG		 6342static
6343int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6344 int write,
6345 void __user *buffer,
6346 size_t *lenp,
6347 loff_t *ppos)
6348{
6349 int *valp = ctl->data;
6350 int val = *valp;
6351 loff_t pos = *ppos;
6352 struct ctl_table lctl;
6353 int ret;
6354
6355 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6356 * we should not modify it until we get the rtnl lock.
6357 */
6358 lctl = *ctl;
6359 lctl.data = &val;
6360
6361 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6362
6363 if (write)
6364 ret = addrconf_fixup_linkdown(ctl, valp, val);
6365 if (ret)
6366 *ppos = pos;
6367 return ret;
6368}
6369
df789fe7
DF		 6370static
6371void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6372{
6373 if (rt) {
6374 if (action)
6375 rt->dst.flags |= DST_NOPOLICY;
6376 else
6377 rt->dst.flags &= ~DST_NOPOLICY;
6378 }
6379}
6380
6381static
6382void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6383{
6384 struct inet6_ifaddr *ifa;
6385
6386 read_lock_bh(&idev->lock);
6387 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6388 spin_lock(&ifa->lock);
6389 if (ifa->rt) {
f88d8ea6 6390 /* host routes only use builtin fib6_nh */
1cf844c7 6391 struct fib6_nh *nh = ifa->rt->fib6_nh;
df789fe7
DF		 6392 int cpu;
6393
66f5d6ce 6394 rcu_read_lock();
3b6761d1 6395 ifa->rt->dst_nopolicy = val ? true : false;
f40b6ae2 6396 if (nh->rt6i_pcpu) {
df789fe7
DF		 6397 for_each_possible_cpu(cpu) {
6398 struct rt6_info **rtp;
6399
f40b6ae2 6400 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
df789fe7
DF		 6401 addrconf_set_nopolicy(*rtp, val);
6402 }
6403 }
66f5d6ce 6404 rcu_read_unlock();
df789fe7
DF		 6405 }
6406 spin_unlock(&ifa->lock);
6407 }
6408 read_unlock_bh(&idev->lock);
6409}
6410
6411static
6412int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6413{
6414 struct inet6_dev *idev;
6415 struct net *net;
6416
6417 if (!rtnl_trylock())
6418 return restart_syscall();
6419
6420 *valp = val;
6421
6422 net = (struct net *)ctl->extra2;
6423 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6424 rtnl_unlock();
6425 return 0;
6426 }
6427
6428 if (valp == &net->ipv6.devconf_all->disable_policy) {
6429 struct net_device *dev;
6430
6431 for_each_netdev(net, dev) {
6432 idev = __in6_dev_get(dev);
6433 if (idev)
6434 addrconf_disable_policy_idev(idev, val);
6435 }
6436 } else {
6437 idev = (struct inet6_dev *)ctl->extra1;
6438 addrconf_disable_policy_idev(idev, val);
6439 }
6440
6441 rtnl_unlock();
6442 return 0;
6443}
6444
6445static
6446int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6447 void __user *buffer, size_t *lenp,
6448 loff_t *ppos)
6449{
6450 int *valp = ctl->data;
6451 int val = *valp;
6452 loff_t pos = *ppos;
6453 struct ctl_table lctl;
6454 int ret;
6455
6456 lctl = *ctl;
6457 lctl.data = &val;
6458 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6459
6460 if (write && (*valp != val))
6461 ret = addrconf_disable_policy(ctl, valp, val);
6462
6463 if (ret)
6464 *ppos = pos;
6465
6466 return ret;
6467}
6468
cb4a4c69 6469static int minus_one = -1;
cb9e684e
MŻ		 6470static const int two_five_five = 255;
6471
607ea7cd 6472static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 6473 {
6474 .procname = "forwarding",
6475 .data = &ipv6_devconf.forwarding,
6476 .maxlen = sizeof(int),
6477 .mode = 0644,
6478 .proc_handler = addrconf_sysctl_forward,
6479 },
6480 {
6481 .procname = "hop_limit",
6482 .data = &ipv6_devconf.hop_limit,
6483 .maxlen = sizeof(int),
6484 .mode = 0644,
cb9e684e 6485 .proc_handler = proc_dointvec_minmax,
eec4844f 6486 .extra1 = (void *)SYSCTL_ONE,
cb9e684e 6487 .extra2 = (void *)&two_five_five,
5df1f77f
KK		 6488 },
6489 {
6490 .procname = "mtu",
6491 .data = &ipv6_devconf.mtu6,
6492 .maxlen = sizeof(int),
6493 .mode = 0644,
6494 .proc_handler = addrconf_sysctl_mtu,
6495 },
6496 {
6497 .procname = "accept_ra",
6498 .data = &ipv6_devconf.accept_ra,
6499 .maxlen = sizeof(int),
6500 .mode = 0644,
6501 .proc_handler = proc_dointvec,
6502 },
6503 {
6504 .procname = "accept_redirects",
6505 .data = &ipv6_devconf.accept_redirects,
6506 .maxlen = sizeof(int),
6507 .mode = 0644,
6508 .proc_handler = proc_dointvec,
6509 },
6510 {
6511 .procname = "autoconf",
6512 .data = &ipv6_devconf.autoconf,
6513 .maxlen = sizeof(int),
6514 .mode = 0644,
6515 .proc_handler = proc_dointvec,
6516 },
6517 {
6518 .procname = "dad_transmits",
6519 .data = &ipv6_devconf.dad_transmits,
6520 .maxlen = sizeof(int),
6521 .mode = 0644,
6522 .proc_handler = proc_dointvec,
6523 },
6524 {
6525 .procname = "router_solicitations",
6526 .data = &ipv6_devconf.rtr_solicits,
6527 .maxlen = sizeof(int),
6528 .mode = 0644,
cb4a4c69
MŻ		 6529 .proc_handler = proc_dointvec_minmax,
6530 .extra1 = &minus_one,
5df1f77f
KK		 6531 },
6532 {
6533 .procname = "router_solicitation_interval",
6534 .data = &ipv6_devconf.rtr_solicit_interval,
6535 .maxlen = sizeof(int),
6536 .mode = 0644,
6537 .proc_handler = proc_dointvec_jiffies,
6538 },
bd11f074
MŻ		 6539 {
6540 .procname = "router_solicitation_max_interval",
6541 .data = &ipv6_devconf.rtr_solicit_max_interval,
6542 .maxlen = sizeof(int),
6543 .mode = 0644,
6544 .proc_handler = proc_dointvec_jiffies,
6545 },
5df1f77f
KK		 6546 {
6547 .procname = "router_solicitation_delay",
6548 .data = &ipv6_devconf.rtr_solicit_delay,
6549 .maxlen = sizeof(int),
6550 .mode = 0644,
6551 .proc_handler = proc_dointvec_jiffies,
6552 },
6553 {
6554 .procname = "force_mld_version",
6555 .data = &ipv6_devconf.force_mld_version,
6556 .maxlen = sizeof(int),
6557 .mode = 0644,
6558 .proc_handler = proc_dointvec,
6559 },
6560 {
6561 .procname = "mldv1_unsolicited_report_interval",
6562 .data =
6563 &ipv6_devconf.mldv1_unsolicited_report_interval,
6564 .maxlen = sizeof(int),
6565 .mode = 0644,
6566 .proc_handler = proc_dointvec_ms_jiffies,
6567 },
6568 {
6569 .procname = "mldv2_unsolicited_report_interval",
6570 .data =
6571 &ipv6_devconf.mldv2_unsolicited_report_interval,
6572 .maxlen = sizeof(int),
6573 .mode = 0644,
6574 .proc_handler = proc_dointvec_ms_jiffies,
6575 },
6576 {
6577 .procname = "use_tempaddr",
6578 .data = &ipv6_devconf.use_tempaddr,
6579 .maxlen = sizeof(int),
6580 .mode = 0644,
6581 .proc_handler = proc_dointvec,
6582 },
6583 {
6584 .procname = "temp_valid_lft",
6585 .data = &ipv6_devconf.temp_valid_lft,
6586 .maxlen = sizeof(int),
6587 .mode = 0644,
6588 .proc_handler = proc_dointvec,
6589 },
6590 {
6591 .procname = "temp_prefered_lft",
6592 .data = &ipv6_devconf.temp_prefered_lft,
6593 .maxlen = sizeof(int),
6594 .mode = 0644,
6595 .proc_handler = proc_dointvec,
6596 },
6597 {
6598 .procname = "regen_max_retry",
6599 .data = &ipv6_devconf.regen_max_retry,
6600 .maxlen = sizeof(int),
6601 .mode = 0644,
6602 .proc_handler = proc_dointvec,
6603 },
6604 {
6605 .procname = "max_desync_factor",
6606 .data = &ipv6_devconf.max_desync_factor,
6607 .maxlen = sizeof(int),
6608 .mode = 0644,
6609 .proc_handler = proc_dointvec,
6610 },
6611 {
6612 .procname = "max_addresses",
6613 .data = &ipv6_devconf.max_addresses,
6614 .maxlen = sizeof(int),
6615 .mode = 0644,
6616 .proc_handler = proc_dointvec,
6617 },
6618 {
6619 .procname = "accept_ra_defrtr",
6620 .data = &ipv6_devconf.accept_ra_defrtr,
6621 .maxlen = sizeof(int),
6622 .mode = 0644,
6623 .proc_handler = proc_dointvec,
6624 },
6625 {
6626 .procname = "accept_ra_min_hop_limit",
6627 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6628 .maxlen = sizeof(int),
6629 .mode = 0644,
6630 .proc_handler = proc_dointvec,
6631 },
6632 {
6633 .procname = "accept_ra_pinfo",
6634 .data = &ipv6_devconf.accept_ra_pinfo,
6635 .maxlen = sizeof(int),
6636 .mode = 0644,
6637 .proc_handler = proc_dointvec,
6638 },
930d6ff2 6639#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 6640 {
6641 .procname = "accept_ra_rtr_pref",
6642 .data = &ipv6_devconf.accept_ra_rtr_pref,
6643 .maxlen = sizeof(int),
6644 .mode = 0644,
6645 .proc_handler = proc_dointvec,
6646 },
6647 {
6648 .procname = "router_probe_interval",
6649 .data = &ipv6_devconf.rtr_probe_interval,
6650 .maxlen = sizeof(int),
6651 .mode = 0644,
6652 .proc_handler = proc_dointvec_jiffies,
6653 },
fa03ef38 6654#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b
JS		 6655 {
6656 .procname = "accept_ra_rt_info_min_plen",
6657 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6658 .maxlen = sizeof(int),
6659 .mode = 0644,
6660 .proc_handler = proc_dointvec,
6661 },
5df1f77f
KK		 6662 {
6663 .procname = "accept_ra_rt_info_max_plen",
6664 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6665 .maxlen = sizeof(int),
6666 .mode = 0644,
6667 .proc_handler = proc_dointvec,
6668 },
09c884d4 6669#endif
930d6ff2 6670#endif
5df1f77f
KK		 6671 {
6672 .procname = "proxy_ndp",
6673 .data = &ipv6_devconf.proxy_ndp,
6674 .maxlen = sizeof(int),
6675 .mode = 0644,
6676 .proc_handler = addrconf_sysctl_proxy_ndp,
6677 },
6678 {
6679 .procname = "accept_source_route",
6680 .data = &ipv6_devconf.accept_source_route,
6681 .maxlen = sizeof(int),
6682 .mode = 0644,
6683 .proc_handler = proc_dointvec,
6684 },
95c385b4 6685#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 6686 {
6687 .procname = "optimistic_dad",
6688 .data = &ipv6_devconf.optimistic_dad,
6689 .maxlen = sizeof(int),
6690 .mode = 0644,
6691 .proc_handler = proc_dointvec,
6692 },
6693 {
6694 .procname = "use_optimistic",
6695 .data = &ipv6_devconf.use_optimistic,
6696 .maxlen = sizeof(int),
6697 .mode = 0644,
6698 .proc_handler = proc_dointvec,
6699 },
7bc570c8
YH		 6700#endif
6701#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 6702 {
6703 .procname = "mc_forwarding",
6704 .data = &ipv6_devconf.mc_forwarding,
6705 .maxlen = sizeof(int),
6706 .mode = 0444,
6707 .proc_handler = proc_dointvec,
6708 },
95c385b4 6709#endif
5df1f77f
KK		 6710 {
6711 .procname = "disable_ipv6",
6712 .data = &ipv6_devconf.disable_ipv6,
6713 .maxlen = sizeof(int),
6714 .mode = 0644,
6715 .proc_handler = addrconf_sysctl_disable,
6716 },
6717 {
6718 .procname = "accept_dad",
6719 .data = &ipv6_devconf.accept_dad,
6720 .maxlen = sizeof(int),
6721 .mode = 0644,
6722 .proc_handler = proc_dointvec,
6723 },
6724 {
6725 .procname = "force_tllao",
6726 .data = &ipv6_devconf.force_tllao,
6727 .maxlen = sizeof(int),
6728 .mode = 0644,
6729 .proc_handler = proc_dointvec
6730 },
6731 {
6732 .procname = "ndisc_notify",
6733 .data = &ipv6_devconf.ndisc_notify,
6734 .maxlen = sizeof(int),
6735 .mode = 0644,
6736 .proc_handler = proc_dointvec
6737 },
6738 {
6739 .procname = "suppress_frag_ndisc",
6740 .data = &ipv6_devconf.suppress_frag_ndisc,
6741 .maxlen = sizeof(int),
6742 .mode = 0644,
6743 .proc_handler = proc_dointvec
6744 },
6745 {
6746 .procname = "accept_ra_from_local",
6747 .data = &ipv6_devconf.accept_ra_from_local,
6748 .maxlen = sizeof(int),
6749 .mode = 0644,
6750 .proc_handler = proc_dointvec,
6751 },
6752 {
6753 .procname = "accept_ra_mtu",
6754 .data = &ipv6_devconf.accept_ra_mtu,
6755 .maxlen = sizeof(int),
6756 .mode = 0644,
6757 .proc_handler = proc_dointvec,
6758 },
6759 {
6760 .procname = "stable_secret",
6761 .data = &ipv6_devconf.stable_secret,
6762 .maxlen = IPV6_MAX_STRLEN,
6763 .mode = 0600,
6764 .proc_handler = addrconf_sysctl_stable_secret,
6765 },
6766 {
6767 .procname = "use_oif_addrs_only",
6768 .data = &ipv6_devconf.use_oif_addrs_only,
6769 .maxlen = sizeof(int),
6770 .mode = 0644,
6771 .proc_handler = proc_dointvec,
6772 },
6773 {
6774 .procname = "ignore_routes_with_linkdown",
6775 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6776 .maxlen = sizeof(int),
6777 .mode = 0644,
6778 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6779 },
6780 {
6781 .procname = "drop_unicast_in_l2_multicast",
6782 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6783 .maxlen = sizeof(int),
6784 .mode = 0644,
6785 .proc_handler = proc_dointvec,
6786 },
6787 {
6788 .procname = "drop_unsolicited_na",
6789 .data = &ipv6_devconf.drop_unsolicited_na,
6790 .maxlen = sizeof(int),
6791 .mode = 0644,
6792 .proc_handler = proc_dointvec,
6793 },
6794 {
6795 .procname = "keep_addr_on_down",
6796 .data = &ipv6_devconf.keep_addr_on_down,
6797 .maxlen = sizeof(int),
6798 .mode = 0644,
6799 .proc_handler = proc_dointvec,
6800
6801 },
1ababeba
DL		 6802 {
6803 .procname = "seg6_enabled",
6804 .data = &ipv6_devconf.seg6_enabled,
6805 .maxlen = sizeof(int),
6806 .mode = 0644,
6807 .proc_handler = proc_dointvec,
6808 },
bf355b8d
DL		 6809#ifdef CONFIG_IPV6_SEG6_HMAC
6810 {
6811 .procname = "seg6_require_hmac",
6812 .data = &ipv6_devconf.seg6_require_hmac,
6813 .maxlen = sizeof(int),
6814 .mode = 0644,
6815 .proc_handler = proc_dointvec,
6816 },
6817#endif
adc176c5
EN		 6818 {
6819 .procname = "enhanced_dad",
6820 .data = &ipv6_devconf.enhanced_dad,
6821 .maxlen = sizeof(int),
6822 .mode = 0644,
6823 .proc_handler = proc_dointvec,
6824 },
d35a00b8
FJ		 6825 {
6826 .procname = "addr_gen_mode",
6827 .data = &ipv6_devconf.addr_gen_mode,
6828 .maxlen = sizeof(int),
6829 .mode = 0644,
6830 .proc_handler = addrconf_sysctl_addr_gen_mode,
6831 },
df789fe7
DF		 6832 {
6833 .procname = "disable_policy",
6834 .data = &ipv6_devconf.disable_policy,
6835 .maxlen = sizeof(int),
6836 .mode = 0644,
6837 .proc_handler = addrconf_sysctl_disable_policy,
6838 },
2210d6b2
MŻ		 6839 {
6840 .procname = "ndisc_tclass",
6841 .data = &ipv6_devconf.ndisc_tclass,
6842 .maxlen = sizeof(int),
6843 .mode = 0644,
6844 .proc_handler = proc_dointvec_minmax,
eec4844f 6845 .extra1 = (void *)SYSCTL_ZERO,
2210d6b2
MŻ		 6846 .extra2 = (void *)&two_five_five,
6847 },
5df1f77f
KK		 6848 {
6849 /* sentinel */
6850 }
1da177e4
LT		 6851};
6852
bff16c2f 6853static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 6854 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4 6855{
29c994e3 6856 int i, ifindex;
607ea7cd 6857 struct ctl_table *table;
6105e293 6858 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 6859
607ea7cd
KK		 6860 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6861 if (!table)
f68635e6
PE		 6862 goto out;
6863
607ea7cd
KK		 6864 for (i = 0; table[i].data; i++) {
6865 table[i].data += (char *)p - (char *)&ipv6_devconf;
cb9e684e
MŻ		 6866 /* If one of these is already set, then it is not safe to
6867 * overwrite either of them: this makes proc_dointvec_minmax
6868 * usable.
6869 */
6870 if (!table[i].extra1 && !table[i].extra2) {
6871 table[i].extra1 = idev; /* embedded; no ref */
6872 table[i].extra2 = net;
6873 }
1da177e4 6874 }
1da177e4 6875
6105e293 6876 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 6877
607ea7cd
KK		 6878 p->sysctl_header = register_net_sysctl(net, path, table);
6879 if (!p->sysctl_header)
6105e293 6880 goto free;
f68635e6 6881
29c994e3
ND		 6882 if (!strcmp(dev_name, "all"))
6883 ifindex = NETCONFA_IFINDEX_ALL;
6884 else if (!strcmp(dev_name, "default"))
6885 ifindex = NETCONFA_IFINDEX_DEFAULT;
6886 else
6887 ifindex = idev->dev->ifindex;
85b3daad
DA		 6888 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6889 ifindex, p);
95897312 6890 return 0;
1da177e4 6891
f68635e6 6892free:
607ea7cd 6893 kfree(table);
f68635e6 6894out:
95897312 6895 return -ENOBUFS;
1da177e4
LT		 6896}
6897
23452170
DA		 6898static void __addrconf_sysctl_unregister(struct net *net,
6899 struct ipv6_devconf *p, int ifindex)
408c4768 6900{
607ea7cd 6901 struct ctl_table *table;
408c4768 6902
607ea7cd 6903 if (!p->sysctl_header)
408c4768
PE		 6904 return;
6905
607ea7cd
KK		 6906 table = p->sysctl_header->ctl_table_arg;
6907 unregister_net_sysctl_table(p->sysctl_header);
6908 p->sysctl_header = NULL;
6909 kfree(table);
23452170
DA		 6910
6911 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
408c4768
PE		 6912}
6913
a317a2f1 6914static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 6915{
a317a2f1
WC		 6916 int err;
6917
6918 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6919 return -EINVAL;
6920
6921 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6922 &ndisc_ifinfo_sysctl_change);
6923 if (err)
6924 return err;
6925 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6926 idev, &idev->cnf);
6927 if (err)
6928 neigh_sysctl_unregister(idev->nd_parms);
6929
6930 return err;
f52295a9
PE		 6931}
6932
408c4768 6933static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 6934{
23452170
DA		 6935 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6936 idev->dev->ifindex);
408c4768 6937 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 6938}
6939
6940
6941#endif
6942
2c8c1e72 6943static int __net_init addrconf_init_net(struct net *net)
e0da5a48 6944{
a79ca223 6945 int err = -ENOMEM;
e0da5a48
PE		 6946 struct ipv6_devconf *all, *dflt;
6947
a79ca223 6948 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 6949 if (!all)
a79ca223 6950 goto err_alloc_all;
e0da5a48 6951
a79ca223 6952 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 6953 if (!dflt)
a79ca223 6954 goto err_alloc_dflt;
e0da5a48 6955
a154d5d8
AB		 6956 if (IS_ENABLED(CONFIG_SYSCTL) &&
6957 sysctl_devconf_inherit_init_net == 1 && !net_eq(net, &init_net)) {
856c395c
CW		 6958 memcpy(all, init_net.ipv6.devconf_all, sizeof(ipv6_devconf));
6959 memcpy(dflt, init_net.ipv6.devconf_dflt, sizeof(ipv6_devconf_dflt));
6960 }
6961
a79ca223
HZ		 6962 /* these will be inherited by all namespaces */
6963 dflt->autoconf = ipv6_defaults.autoconf;
6964 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 6965
3d1bec99
HFS		 6966 dflt->stable_secret.initialized = false;
6967 all->stable_secret.initialized = false;
6968
e0da5a48
PE		 6969 net->ipv6.devconf_all = all;
6970 net->ipv6.devconf_dflt = dflt;
6971
6972#ifdef CONFIG_SYSCTL
f8572d8f 6973 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 6974 if (err < 0)
6975 goto err_reg_all;
6976
f8572d8f 6977 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 6978 if (err < 0)
6979 goto err_reg_dflt;
6980#endif
6981 return 0;
6982
6983#ifdef CONFIG_SYSCTL
6984err_reg_dflt:
23452170 6985 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
e0da5a48
PE		 6986err_reg_all:
6987 kfree(dflt);
6988#endif
6989err_alloc_dflt:
6990 kfree(all);
6991err_alloc_all:
6992 return err;
6993}
6994
2c8c1e72 6995static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 6996{
6997#ifdef CONFIG_SYSCTL
23452170
DA		 6998 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6999 NETCONFA_IFINDEX_DEFAULT);
7000 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7001 NETCONFA_IFINDEX_ALL);
e0da5a48 7002#endif
73cf0e92 7003 kfree(net->ipv6.devconf_dflt);
7004 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 7005}
7006
7007static struct pernet_operations addrconf_ops = {
7008 .init = addrconf_init_net,
7009 .exit = addrconf_exit_net,
7010};
7011
207895fd 7012static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 7013 .family = AF_INET6,
7014 .fill_link_af = inet6_fill_link_af,
7015 .get_link_af_size = inet6_get_link_af_size,
11b1f828 7016 .validate_link_af = inet6_validate_link_af,
f53adae4 7017 .set_link_af = inet6_set_link_af,
b382b191
TG		 7018};
7019
1da177e4
LT		 7020/*
7021 * Init / cleanup code
7022 */
7023
7024int __init addrconf_init(void)
7025{
a317a2f1 7026 struct inet6_dev *idev;
c2e21293 7027 int i, err;
2a8cc6c8 7028
e21e8467
SH		 7029 err = ipv6_addr_label_init();
7030 if (err < 0) {
f3213831
JP		 7031 pr_crit("%s: cannot initialize default policy table: %d\n",
7032 __func__, err);
2cc6d2bf 7033 goto out;
2a8cc6c8 7034 }
1da177e4 7035
2cc6d2bf
NH		 7036 err = register_pernet_subsys(&addrconf_ops);
7037 if (err < 0)
7038 goto out_addrlabel;
e0da5a48 7039
c15b1cca
HFS		 7040 addrconf_wq = create_workqueue("ipv6_addrconf");
7041 if (!addrconf_wq) {
7042 err = -ENOMEM;
7043 goto out_nowq;
7044 }
7045
1da177e4
LT		 7046 /* The addrconf netdev notifier requires that loopback_dev
7047 * has it's ipv6 private information allocated and setup
7048 * before it can bring up and give link-local addresses
7049 * to other devices which are up.
7050 *
7051 * Unfortunately, loopback_dev is not necessarily the first
7052 * entry in the global dev_base list of net devices. In fact,
7053 * it is likely to be the very last entry on that list.
7054 * So this causes the notifier registry below to try and
7055 * give link-local addresses to all devices besides loopback_dev
7056 * first, then loopback_dev, which cases all the non-loopback_dev
7057 * devices to fail to get a link-local address.
7058 *
7059 * So, as a temporary fix, allocate the ipv6 structure for
7060 * loopback_dev first by hand.
7061 * Longer term, all of the dependencies ipv6 has upon the loopback
7062 * device and it being up should be removed.
7063 */
7064 rtnl_lock();
a317a2f1 7065 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 7066 rtnl_unlock();
a317a2f1
WC		 7067 if (IS_ERR(idev)) {
7068 err = PTR_ERR(idev);
e0da5a48 7069 goto errlo;
a317a2f1 7070 }
1da177e4 7071
2f460933
WC		 7072 ip6_route_init_special_entries();
7073
c2e21293 7074 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7075 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
7076
1da177e4
LT		 7077 register_netdevice_notifier(&ipv6_dev_notf);
7078
c15b1cca 7079 addrconf_verify();
c127ea2c 7080
3678a9d8 7081 rtnl_af_register(&inet6_ops);
b382b191 7082
16feebcf
FW		 7083 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7084 NULL, inet6_dump_ifinfo, 0);
c127ea2c
TG		 7085 if (err < 0)
7086 goto errout;
7087
16feebcf
FW		 7088 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7089 inet6_rtm_newaddr, NULL, 0);
7090 if (err < 0)
7091 goto errout;
7092 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7093 inet6_rtm_deladdr, NULL, 0);
7094 if (err < 0)
7095 goto errout;
7096 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7097 inet6_rtm_getaddr, inet6_dump_ifaddr,
7098 RTNL_FLAG_DOIT_UNLOCKED);
7099 if (err < 0)
7100 goto errout;
7101 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7102 NULL, inet6_dump_ifmcaddr, 0);
7103 if (err < 0)
7104 goto errout;
7105 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7106 NULL, inet6_dump_ifacaddr, 0);
7107 if (err < 0)
7108 goto errout;
7109 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7110 inet6_netconf_get_devconf,
7111 inet6_netconf_dump_devconf,
7112 RTNL_FLAG_DOIT_UNLOCKED);
7113 if (err < 0)
7114 goto errout;
a3fde2ad
FW		 7115 err = ipv6_addr_label_rtnl_register();
7116 if (err < 0)
7117 goto errout;
2a8cc6c8 7118
1da177e4 7119 return 0;
c127ea2c 7120errout:
16feebcf 7121 rtnl_unregister_all(PF_INET6);
b382b191 7122 rtnl_af_unregister(&inet6_ops);
c127ea2c 7123 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 7124errlo:
c15b1cca
HFS		 7125 destroy_workqueue(addrconf_wq);
7126out_nowq:
e0da5a48 7127 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 7128out_addrlabel:
7129 ipv6_addr_label_cleanup();
7130out:
c127ea2c 7131 return err;
1da177e4
LT		 7132}
7133
09f7709f 7134void addrconf_cleanup(void)
1da177e4 7135{
176c39af 7136 struct net_device *dev;
1da177e4
LT		 7137 int i;
7138
7139 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 7140 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 7141 ipv6_addr_label_cleanup();
1da177e4 7142
5c45121d 7143 rtnl_af_unregister(&inet6_ops);
1da177e4 7144
5c45121d 7145 rtnl_lock();
b382b191 7146
176c39af
DL		 7147 /* clean dev list */
7148 for_each_netdev(&init_net, dev) {
7149 if (__in6_dev_get(dev) == NULL)
7150 continue;
7151 addrconf_ifdown(dev, 1);
7152 }
7153 addrconf_ifdown(init_net.loopback_dev, 2);
7154
1da177e4
LT		 7155 /*
7156 * Check hash table.
7157 */
5c578aed 7158 spin_lock_bh(&addrconf_hash_lock);
c2e21293 7159 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7160 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 7161 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 7162 cancel_delayed_work(&addr_chk_work);
1da177e4 7163 rtnl_unlock();
c15b1cca
HFS		 7164
7165 destroy_workqueue(addrconf_wq);
1da177e4 7166}
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