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Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <[email protected]>
1da177e4
LT		 7 * Alexey Kuznetsov <[email protected]>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <[email protected]>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
174cd4b1 46#include <linux/sched/signal.h>
1da177e4
LT		 47#include <linux/socket.h>
48#include <linux/sockios.h>
1da177e4 49#include <linux/net.h>
3d1bec99 50#include <linux/inet.h>
1da177e4
LT		 51#include <linux/in6.h>
52#include <linux/netdevice.h>
1823730f 53#include <linux/if_addr.h>
1da177e4
LT		 54#include <linux/if_arp.h>
55#include <linux/if_arcnet.h>
56#include <linux/if_infiniband.h>
57#include <linux/route.h>
58#include <linux/inetdevice.h>
59#include <linux/init.h>
5a0e3ad6 60#include <linux/slab.h>
1da177e4
LT		 61#ifdef CONFIG_SYSCTL
62#include <linux/sysctl.h>
63#endif
4fc268d2 64#include <linux/capability.h>
1da177e4
LT		 65#include <linux/delay.h>
66#include <linux/notifier.h>
543537bd 67#include <linux/string.h>
ddbe5032 68#include <linux/hash.h>
1da177e4 69
457c4cbc 70#include <net/net_namespace.h>
1da177e4
LT		 71#include <net/sock.h>
72#include <net/snmp.h>
73
5241c2d7 74#include <net/6lowpan.h>
cb6bf355 75#include <net/firewire.h>
1da177e4
LT		 76#include <net/ipv6.h>
77#include <net/protocol.h>
78#include <net/ndisc.h>
79#include <net/ip6_route.h>
80#include <net/addrconf.h>
81#include <net/tcp.h>
82#include <net/ip.h>
5d620266 83#include <net/netlink.h>
f24e3d65 84#include <net/pkt_sched.h>
ca254490 85#include <net/l3mdev.h>
1da177e4
LT		 86#include <linux/if_tunnel.h>
87#include <linux/rtnetlink.h>
f3a1bfb1 88#include <linux/netconf.h>
1da177e4 89#include <linux/random.h>
e21e8467 90#include <linux/uaccess.h>
7f7d9a6b 91#include <asm/unaligned.h>
1da177e4
LT		 92
93#include <linux/proc_fs.h>
94#include <linux/seq_file.h>
bc3b2d7f 95#include <linux/export.h>
1da177e4 96
1da177e4 97#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e 98
3d1bec99
HFS		 99#define IPV6_MAX_STRLEN \
100 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
101
18a31e1e
TG		 102static inline u32 cstamp_delta(unsigned long cstamp)
103{
104 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
105}
1da177e4 106
bd11f074
MŻ		 107static inline s32 rfc3315_s14_backoff_init(s32 irt)
108{
109 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
110 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
111 do_div(tmp, 1000000);
112 return (s32)tmp;
113}
114
115static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
116{
117 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
118 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
119 do_div(tmp, 1000000);
120 if ((s32)tmp > mrt) {
121 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
122 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
123 do_div(tmp, 1000000);
124 }
125 return (s32)tmp;
126}
127
1da177e4 128#ifdef CONFIG_SYSCTL
a317a2f1 129static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 130static void addrconf_sysctl_unregister(struct inet6_dev *idev);
131#else
a317a2f1 132static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 133{
a317a2f1 134 return 0;
408c4768
PE		 135}
136
137static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
138{
139}
1da177e4
LT		 140#endif
141
9d6280da
JB		 142static void ipv6_regen_rndid(struct inet6_dev *idev);
143static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 144
1b34be74 145static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
d9bf82c2 146static int ipv6_count_addresses(const struct inet6_dev *idev);
622c81d5
HFS		 147static int ipv6_generate_stable_address(struct in6_addr *addr,
148 u8 dad_count,
149 const struct inet6_dev *idev);
1da177e4 150
27c565ae
ED		 151#define IN6_ADDR_HSIZE_SHIFT 8
152#define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
1da177e4
LT		 153/*
154 * Configured unicast address hash table
155 */
c2e21293 156static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 157static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 158
c15b1cca
HFS		 159static void addrconf_verify(void);
160static void addrconf_verify_rtnl(void);
161static void addrconf_verify_work(struct work_struct *);
1da177e4 162
c15b1cca
HFS		 163static struct workqueue_struct *addrconf_wq;
164static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 165
166static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
167static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
168
93d9b7d7
JP		 169static void addrconf_type_change(struct net_device *dev,
170 unsigned long event);
1da177e4
LT		 171static int addrconf_ifdown(struct net_device *dev, int how);
172
8d1c802b 173static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
21caa662
RK		 174 int plen,
175 const struct net_device *dev,
176 u32 flags, u32 noflags);
177
cf22f9a2 178static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 179static void addrconf_dad_work(struct work_struct *w);
c76fe2d9
DA		 180static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
181 bool send_na);
896585d4 182static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
e99e88a9 183static void addrconf_rs_timer(struct timer_list *t);
1da177e4
LT		 184static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
185static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
186
1ab1457c 187static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 188 struct prefix_info *pinfo);
1da177e4 189
888c848e 190static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 191 .forwarding = 0,
192 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
193 .mtu6 = IPV6_MIN_MTU,
194 .accept_ra = 1,
195 .accept_redirects = 1,
196 .autoconf = 1,
197 .force_mld_version = 0,
fc4eba58
HFS		 198 .mldv1_unsolicited_report_interval = 10 * HZ,
199 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 200 .dad_transmits = 1,
201 .rtr_solicits = MAX_RTR_SOLICITATIONS,
202 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 203 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 204 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 205 .use_tempaddr = 0,
1da177e4
LT		 206 .temp_valid_lft = TEMP_VALID_LIFETIME,
207 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
208 .regen_max_retry = REGEN_MAX_RETRY,
209 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 210 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 211 .accept_ra_defrtr = 1,
d9333196 212 .accept_ra_from_local = 0,
8013d1d7 213 .accept_ra_min_hop_limit= 1,
c4fd30eb 214 .accept_ra_pinfo = 1,
930d6ff2
YH		 215#ifdef CONFIG_IPV6_ROUTER_PREF
216 .accept_ra_rtr_pref = 1,
52e16356 217 .rtr_probe_interval = 60 * HZ,
09c884d4 218#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 219 .accept_ra_rt_info_min_plen = 0,
09c884d4
YH		 220 .accept_ra_rt_info_max_plen = 0,
221#endif
930d6ff2 222#endif
fbea49e1 223 .proxy_ndp = 0,
0bcbc926 224 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 225 .disable_ipv6 = 0,
09400953 226 .accept_dad = 0,
b800c3b9 227 .suppress_frag_ndisc = 1,
c2943f14 228 .accept_ra_mtu = 1,
3d1bec99
HFS		 229 .stable_secret = {
230 .initialized = false,
3985e8a3
EK		 231 },
232 .use_oif_addrs_only = 0,
35103d11 233 .ignore_routes_with_linkdown = 0,
f1705ec1 234 .keep_addr_on_down = 0,
1ababeba 235 .seg6_enabled = 0,
bf355b8d
DL		 236#ifdef CONFIG_IPV6_SEG6_HMAC
237 .seg6_require_hmac = 0,
238#endif
adc176c5 239 .enhanced_dad = 1,
d35a00b8 240 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
df789fe7 241 .disable_policy = 0,
1da177e4
LT		 242};
243
ab32ea5d 244static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 245 .forwarding = 0,
246 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
247 .mtu6 = IPV6_MIN_MTU,
248 .accept_ra = 1,
249 .accept_redirects = 1,
250 .autoconf = 1,
fc4eba58
HFS		 251 .force_mld_version = 0,
252 .mldv1_unsolicited_report_interval = 10 * HZ,
253 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 254 .dad_transmits = 1,
255 .rtr_solicits = MAX_RTR_SOLICITATIONS,
256 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 257 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 258 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 259 .use_tempaddr = 0,
260 .temp_valid_lft = TEMP_VALID_LIFETIME,
261 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
262 .regen_max_retry = REGEN_MAX_RETRY,
263 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 264 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 265 .accept_ra_defrtr = 1,
d9333196 266 .accept_ra_from_local = 0,
8013d1d7 267 .accept_ra_min_hop_limit= 1,
c4fd30eb 268 .accept_ra_pinfo = 1,
930d6ff2
YH		 269#ifdef CONFIG_IPV6_ROUTER_PREF
270 .accept_ra_rtr_pref = 1,
52e16356 271 .rtr_probe_interval = 60 * HZ,
09c884d4 272#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 273 .accept_ra_rt_info_min_plen = 0,
09c884d4
YH		 274 .accept_ra_rt_info_max_plen = 0,
275#endif
930d6ff2 276#endif
fbea49e1 277 .proxy_ndp = 0,
0bcbc926 278 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 279 .disable_ipv6 = 0,
1b34be74 280 .accept_dad = 1,
b800c3b9 281 .suppress_frag_ndisc = 1,
c2943f14 282 .accept_ra_mtu = 1,
3d1bec99
HFS		 283 .stable_secret = {
284 .initialized = false,
285 },
3985e8a3 286 .use_oif_addrs_only = 0,
35103d11 287 .ignore_routes_with_linkdown = 0,
f1705ec1 288 .keep_addr_on_down = 0,
1ababeba 289 .seg6_enabled = 0,
bf355b8d
DL		 290#ifdef CONFIG_IPV6_SEG6_HMAC
291 .seg6_require_hmac = 0,
292#endif
adc176c5 293 .enhanced_dad = 1,
d35a00b8 294 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
df789fe7 295 .disable_policy = 0,
1da177e4
LT		 296};
297
1f372c7b
MM		 298/* Check if link is ready: is it up and is a valid qdisc available */
299static inline bool addrconf_link_ready(const struct net_device *dev)
f24e3d65 300{
1f372c7b 301 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
f24e3d65
MC		 302}
303
b7b1bfce 304static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 305{
b7b1bfce
HFS		 306 if (del_timer(&idev->rs_timer))
307 __in6_dev_put(idev);
308}
309
c15b1cca 310static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 311{
c15b1cca 312 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 313 __in6_ifa_put(ifp);
314}
315
b7b1bfce
HFS		 316static void addrconf_mod_rs_timer(struct inet6_dev *idev,
317 unsigned long when)
318{
319 if (!timer_pending(&idev->rs_timer))
320 in6_dev_hold(idev);
321 mod_timer(&idev->rs_timer, jiffies + when);
322}
1da177e4 323
c15b1cca
HFS		 324static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
325 unsigned long delay)
1da177e4 326{
f8a894b2
XL		 327 in6_ifa_hold(ifp);
328 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
329 in6_ifa_put(ifp);
1da177e4
LT		 330}
331
7f7d9a6b
HX		 332static int snmp6_alloc_dev(struct inet6_dev *idev)
333{
827da44c
JS		 334 int i;
335
698365fa
WC		 336 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
337 if (!idev->stats.ipv6)
7f7d9a6b 338 goto err_ip;
827da44c
JS		 339
340 for_each_possible_cpu(i) {
341 struct ipstats_mib *addrconf_stats;
698365fa 342 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 343 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 344 }
345
346
be281e55
ED		 347 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
348 GFP_KERNEL);
349 if (!idev->stats.icmpv6dev)
7f7d9a6b 350 goto err_icmp;
be281e55
ED		 351 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
352 GFP_KERNEL);
353 if (!idev->stats.icmpv6msgdev)
14878f75 354 goto err_icmpmsg;
7f7d9a6b
HX		 355
356 return 0;
357
14878f75 358err_icmpmsg:
be281e55 359 kfree(idev->stats.icmpv6dev);
7f7d9a6b 360err_icmp:
698365fa 361 free_percpu(idev->stats.ipv6);
7f7d9a6b 362err_ip:
aaf70ec7 363 return -ENOMEM;
7f7d9a6b
HX		 364}
365
8e5e8f30 366static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 367{
368 struct inet6_dev *ndev;
a317a2f1 369 int err = -ENOMEM;
1da177e4
LT		 370
371 ASSERT_RTNL();
372
373 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 374 return ERR_PTR(-EINVAL);
1da177e4 375
1ab1457c 376 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
63159f29 377 if (!ndev)
a317a2f1 378 return ERR_PTR(err);
322f74a4
IO		 379
380 rwlock_init(&ndev->lock);
381 ndev->dev = dev;
502a2ffd 382 INIT_LIST_HEAD(&ndev->addr_list);
e99e88a9 383 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
c346dca1 384 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
9b29c696
HFS		 385
386 if (ndev->cnf.stable_secret.initialized)
d35a00b8 387 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
9b29c696 388
322f74a4 389 ndev->cnf.mtu6 = dev->mtu;
322f74a4 390 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
63159f29 391 if (!ndev->nd_parms) {
322f74a4 392 kfree(ndev);
a317a2f1 393 return ERR_PTR(err);
322f74a4 394 }
0187bdfb
BH		 395 if (ndev->cnf.forwarding)
396 dev_disable_lro(dev);
322f74a4
IO		 397 /* We refer to the device */
398 dev_hold(dev);
1da177e4 399
322f74a4 400 if (snmp6_alloc_dev(ndev) < 0) {
e32ac250
JP		 401 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
402 __func__);
322f74a4 403 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 404 dev_put(dev);
405 kfree(ndev);
a317a2f1 406 return ERR_PTR(err);
322f74a4 407 }
1da177e4 408
322f74a4 409 if (snmp6_register_dev(ndev) < 0) {
e32ac250
JP		 410 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
411 __func__, dev->name);
a317a2f1 412 goto err_release;
322f74a4
IO		 413 }
414
9d6280da 415 /* One reference from device. */
1be92460 416 refcount_set(&ndev->refcnt, 1);
1da177e4 417
1b34be74
YH		 418 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
419 ndev->cnf.accept_dad = -1;
420
07a93626 421#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 422 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 423 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 424 ndev->cnf.rtr_solicits = 0;
425 }
426#endif
427
372e6c8f 428 INIT_LIST_HEAD(&ndev->tempaddr_list);
76506a98 429 ndev->desync_factor = U32_MAX;
322f74a4
IO		 430 if ((dev->flags&IFF_LOOPBACK) ||
431 dev->type == ARPHRD_TUNNEL ||
9625ed72 432 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 433 dev->type == ARPHRD_SIT ||
0be669bb 434 dev->type == ARPHRD_NONE) {
322f74a4 435 ndev->cnf.use_tempaddr = -1;
9d6280da
JB		 436 } else
437 ipv6_regen_rndid(ndev);
5d9efa7e 438
914faa14 439 ndev->token = in6addr_any;
1da177e4 440
1f372c7b 441 if (netif_running(dev) && addrconf_link_ready(dev))
53aadcc9
HX		 442 ndev->if_flags |= IF_READY;
443
322f74a4
IO		 444 ipv6_mc_init_dev(ndev);
445 ndev->tstamp = jiffies;
a317a2f1
WC		 446 err = addrconf_sysctl_register(ndev);
447 if (err) {
448 ipv6_mc_destroy_dev(ndev);
2a189f9e 449 snmp6_unregister_dev(ndev);
a317a2f1
WC		 450 goto err_release;
451 }
30c4cf57 452 /* protected by rtnl_lock */
cf778b00 453 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 454
2c5e8933
HFS		 455 /* Join interface-local all-node multicast group */
456 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
457
d88ae4cc 458 /* Join all-node multicast group */
f3ee4010 459 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 460
d6ddef9e 461 /* Join all-router multicast group if forwarding is set */
8b2aaede 462 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 463 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
464
1da177e4 465 return ndev;
a317a2f1
WC		 466
467err_release:
468 neigh_parms_release(&nd_tbl, ndev->nd_parms);
469 ndev->dead = 1;
470 in6_dev_finish_destroy(ndev);
471 return ERR_PTR(err);
1da177e4
LT		 472}
473
8e5e8f30 474static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 475{
476 struct inet6_dev *idev;
477
478 ASSERT_RTNL();
479
e21e8467
SH		 480 idev = __in6_dev_get(dev);
481 if (!idev) {
482 idev = ipv6_add_dev(dev);
a317a2f1 483 if (IS_ERR(idev))
1da177e4
LT		 484 return NULL;
485 }
c5e33bdd 486
1da177e4
LT		 487 if (dev->flags&IFF_UP)
488 ipv6_mc_up(idev);
489 return idev;
490}
491
f3a1bfb1
ND		 492static int inet6_netconf_msgsize_devconf(int type)
493{
494 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
495 + nla_total_size(4); /* NETCONFA_IFINDEX */
136ba622 496 bool all = false;
f3a1bfb1 497
136ba622
ZS		 498 if (type == NETCONFA_ALL)
499 all = true;
500
501 if (all || type == NETCONFA_FORWARDING)
f3a1bfb1 502 size += nla_total_size(4);
b1afce95 503#ifdef CONFIG_IPV6_MROUTE
136ba622 504 if (all || type == NETCONFA_MC_FORWARDING)
d67b8c61 505 size += nla_total_size(4);
b1afce95 506#endif
136ba622 507 if (all || type == NETCONFA_PROXY_NEIGH)
c92d5491 508 size += nla_total_size(4);
f3a1bfb1 509
136ba622 510 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
35103d11
AG		 511 size += nla_total_size(4);
512
f3a1bfb1
ND		 513 return size;
514}
515
516static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
517 struct ipv6_devconf *devconf, u32 portid,
518 u32 seq, int event, unsigned int flags,
519 int type)
520{
521 struct nlmsghdr *nlh;
522 struct netconfmsg *ncm;
136ba622 523 bool all = false;
f3a1bfb1
ND		 524
525 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
526 flags);
63159f29 527 if (!nlh)
f3a1bfb1
ND		 528 return -EMSGSIZE;
529
136ba622
ZS		 530 if (type == NETCONFA_ALL)
531 all = true;
532
f3a1bfb1
ND		 533 ncm = nlmsg_data(nlh);
534 ncm->ncm_family = AF_INET6;
535
536 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
537 goto nla_put_failure;
538
23452170
DA		 539 if (!devconf)
540 goto out;
541
136ba622 542 if ((all || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 543 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
544 goto nla_put_failure;
b1afce95 545#ifdef CONFIG_IPV6_MROUTE
136ba622 546 if ((all || type == NETCONFA_MC_FORWARDING) &&
d67b8c61
ND		 547 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
548 devconf->mc_forwarding) < 0)
549 goto nla_put_failure;
b1afce95 550#endif
136ba622 551 if ((all || type == NETCONFA_PROXY_NEIGH) &&
c92d5491 552 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
553 goto nla_put_failure;
554
136ba622 555 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
35103d11
AG		 556 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
557 devconf->ignore_routes_with_linkdown) < 0)
558 goto nla_put_failure;
559
23452170 560out:
053c095a
JB		 561 nlmsg_end(skb, nlh);
562 return 0;
f3a1bfb1
ND		 563
564nla_put_failure:
565 nlmsg_cancel(skb, nlh);
566 return -EMSGSIZE;
567}
568
85b3daad
DA		 569void inet6_netconf_notify_devconf(struct net *net, int event, int type,
570 int ifindex, struct ipv6_devconf *devconf)
f3a1bfb1
ND		 571{
572 struct sk_buff *skb;
573 int err = -ENOBUFS;
574
927265bc 575 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
63159f29 576 if (!skb)
f3a1bfb1
ND		 577 goto errout;
578
579 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
85b3daad 580 event, 0, type);
f3a1bfb1
ND		 581 if (err < 0) {
582 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
583 WARN_ON(err == -EMSGSIZE);
584 kfree_skb(skb);
585 goto errout;
586 }
927265bc 587 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
f3a1bfb1
ND		 588 return;
589errout:
bd779028 590 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 591}
592
76f8f6cb
ND		 593static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
594 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
595 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 596 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
35103d11 597 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
76f8f6cb
ND		 598};
599
600static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
c21ef3e3
DA		 601 struct nlmsghdr *nlh,
602 struct netlink_ext_ack *extack)
76f8f6cb
ND		 603{
604 struct net *net = sock_net(in_skb->sk);
605 struct nlattr *tb[NETCONFA_MAX+1];
4ea2607f
FW		 606 struct inet6_dev *in6_dev = NULL;
607 struct net_device *dev = NULL;
76f8f6cb
ND		 608 struct netconfmsg *ncm;
609 struct sk_buff *skb;
610 struct ipv6_devconf *devconf;
76f8f6cb
ND		 611 int ifindex;
612 int err;
613
614 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
c21ef3e3 615 devconf_ipv6_policy, extack);
76f8f6cb 616 if (err < 0)
4ea2607f 617 return err;
76f8f6cb 618
76f8f6cb 619 if (!tb[NETCONFA_IFINDEX])
4ea2607f 620 return -EINVAL;
76f8f6cb 621
4ea2607f 622 err = -EINVAL;
76f8f6cb
ND		 623 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
624 switch (ifindex) {
625 case NETCONFA_IFINDEX_ALL:
626 devconf = net->ipv6.devconf_all;
627 break;
628 case NETCONFA_IFINDEX_DEFAULT:
629 devconf = net->ipv6.devconf_dflt;
630 break;
631 default:
4ea2607f 632 dev = dev_get_by_index(net, ifindex);
63159f29 633 if (!dev)
4ea2607f
FW		 634 return -EINVAL;
635 in6_dev = in6_dev_get(dev);
63159f29 636 if (!in6_dev)
76f8f6cb
ND		 637 goto errout;
638 devconf = &in6_dev->cnf;
639 break;
640 }
641
642 err = -ENOBUFS;
4ea2607f 643 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
63159f29 644 if (!skb)
76f8f6cb
ND		 645 goto errout;
646
647 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
648 NETLINK_CB(in_skb).portid,
649 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
136ba622 650 NETCONFA_ALL);
76f8f6cb
ND		 651 if (err < 0) {
652 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
653 WARN_ON(err == -EMSGSIZE);
654 kfree_skb(skb);
655 goto errout;
656 }
657 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
658errout:
4ea2607f
FW		 659 if (in6_dev)
660 in6_dev_put(in6_dev);
661 if (dev)
662 dev_put(dev);
76f8f6cb
ND		 663 return err;
664}
665
7a674200
ND		 666static int inet6_netconf_dump_devconf(struct sk_buff *skb,
667 struct netlink_callback *cb)
668{
addd383f 669 const struct nlmsghdr *nlh = cb->nlh;
7a674200
ND		 670 struct net *net = sock_net(skb->sk);
671 int h, s_h;
672 int idx, s_idx;
673 struct net_device *dev;
674 struct inet6_dev *idev;
675 struct hlist_head *head;
676
addd383f
DA		 677 if (cb->strict_check) {
678 struct netlink_ext_ack *extack = cb->extack;
679 struct netconfmsg *ncm;
680
681 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
682 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
683 return -EINVAL;
684 }
685
686 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
687 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
688 return -EINVAL;
689 }
690 }
691
7a674200
ND		 692 s_h = cb->args[0];
693 s_idx = idx = cb->args[1];
694
695 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
696 idx = 0;
697 head = &net->dev_index_head[h];
698 rcu_read_lock();
63998ac2
ND		 699 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
700 net->dev_base_seq;
7a674200
ND		 701 hlist_for_each_entry_rcu(dev, head, index_hlist) {
702 if (idx < s_idx)
703 goto cont;
704 idev = __in6_dev_get(dev);
705 if (!idev)
706 goto cont;
707
708 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
709 &idev->cnf,
710 NETLINK_CB(cb->skb).portid,
addd383f 711 nlh->nlmsg_seq,
7a674200
ND		 712 RTM_NEWNETCONF,
713 NLM_F_MULTI,
136ba622 714 NETCONFA_ALL) < 0) {
7a674200
ND		 715 rcu_read_unlock();
716 goto done;
717 }
63998ac2 718 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 719cont:
720 idx++;
721 }
722 rcu_read_unlock();
723 }
724 if (h == NETDEV_HASHENTRIES) {
725 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
726 net->ipv6.devconf_all,
727 NETLINK_CB(cb->skb).portid,
addd383f 728 nlh->nlmsg_seq,
7a674200 729 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 730 NETCONFA_ALL) < 0)
7a674200
ND		 731 goto done;
732 else
733 h++;
734 }
735 if (h == NETDEV_HASHENTRIES + 1) {
736 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
737 net->ipv6.devconf_dflt,
738 NETLINK_CB(cb->skb).portid,
addd383f 739 nlh->nlmsg_seq,
7a674200 740 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 741 NETCONFA_ALL) < 0)
7a674200
ND		 742 goto done;
743 else
744 h++;
745 }
746done:
747 cb->args[0] = h;
748 cb->args[1] = idx;
749
750 return skb->len;
751}
752
1da177e4
LT		 753#ifdef CONFIG_SYSCTL
754static void dev_forward_change(struct inet6_dev *idev)
755{
756 struct net_device *dev;
757 struct inet6_ifaddr *ifa;
1da177e4
LT		 758
759 if (!idev)
760 return;
761 dev = idev->dev;
0187bdfb
BH		 762 if (idev->cnf.forwarding)
763 dev_disable_lro(dev);
1a940835 764 if (dev->flags & IFF_MULTICAST) {
2c5e8933 765 if (idev->cnf.forwarding) {
f3ee4010 766 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 767 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
768 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
769 } else {
f3ee4010 770 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 771 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
772 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
773 }
1da177e4 774 }
502a2ffd 775
776 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 777 if (ifa->flags&IFA_F_TENTATIVE)
778 continue;
1da177e4
LT		 779 if (idev->cnf.forwarding)
780 addrconf_join_anycast(ifa);
781 else
782 addrconf_leave_anycast(ifa);
783 }
85b3daad
DA		 784 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
785 NETCONFA_FORWARDING,
f3a1bfb1 786 dev->ifindex, &idev->cnf);
1da177e4
LT		 787}
788
789
e186932b 790static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 791{
792 struct net_device *dev;
793 struct inet6_dev *idev;
794
4acd4945 795 for_each_netdev(net, dev) {
1da177e4
LT		 796 idev = __in6_dev_get(dev);
797 if (idev) {
e186932b
PE		 798 int changed = (!idev->cnf.forwarding) ^ (!newf);
799 idev->cnf.forwarding = newf;
1da177e4
LT		 800 if (changed)
801 dev_forward_change(idev);
802 }
1da177e4 803 }
1da177e4 804}
c8fecf22 805
013d97e9 806static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 807{
bff16c2f 808 struct net *net;
013d97e9
FR		 809 int old;
810
811 if (!rtnl_trylock())
812 return restart_syscall();
bff16c2f
PE		 813
814 net = (struct net *)table->extra2;
013d97e9
FR		 815 old = *p;
816 *p = newf;
b325fddb 817
013d97e9 818 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1 819 if ((!newf) ^ (!old))
85b3daad
DA		 820 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
821 NETCONFA_FORWARDING,
f3a1bfb1
ND		 822 NETCONFA_IFINDEX_DEFAULT,
823 net->ipv6.devconf_dflt);
013d97e9
FR		 824 rtnl_unlock();
825 return 0;
88af182e 826 }
c8fecf22 827
e186932b 828 if (p == &net->ipv6.devconf_all->forwarding) {
d26c638c
ND		 829 int old_dflt = net->ipv6.devconf_dflt->forwarding;
830
e186932b 831 net->ipv6.devconf_dflt->forwarding = newf;
d26c638c 832 if ((!newf) ^ (!old_dflt))
85b3daad
DA		 833 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
834 NETCONFA_FORWARDING,
d26c638c
ND		 835 NETCONFA_IFINDEX_DEFAULT,
836 net->ipv6.devconf_dflt);
837
e186932b 838 addrconf_forward_change(net, newf);
f3a1bfb1 839 if ((!newf) ^ (!old))
85b3daad
DA		 840 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
841 NETCONFA_FORWARDING,
f3a1bfb1
ND		 842 NETCONFA_IFINDEX_ALL,
843 net->ipv6.devconf_all);
013d97e9 844 } else if ((!newf) ^ (!old))
c8fecf22 845 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 846 rtnl_unlock();
c8fecf22 847
013d97e9 848 if (newf)
7b4da532 849 rt6_purge_dflt_routers(net);
b325fddb 850 return 1;
c8fecf22 851}
35103d11
AG		 852
853static void addrconf_linkdown_change(struct net *net, __s32 newf)
854{
855 struct net_device *dev;
856 struct inet6_dev *idev;
857
858 for_each_netdev(net, dev) {
859 idev = __in6_dev_get(dev);
860 if (idev) {
861 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
862
863 idev->cnf.ignore_routes_with_linkdown = newf;
864 if (changed)
865 inet6_netconf_notify_devconf(dev_net(dev),
85b3daad 866 RTM_NEWNETCONF,
35103d11
AG		 867 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
868 dev->ifindex,
869 &idev->cnf);
870 }
871 }
872}
873
874static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
875{
876 struct net *net;
877 int old;
878
879 if (!rtnl_trylock())
880 return restart_syscall();
881
882 net = (struct net *)table->extra2;
883 old = *p;
884 *p = newf;
885
886 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
887 if ((!newf) ^ (!old))
888 inet6_netconf_notify_devconf(net,
85b3daad 889 RTM_NEWNETCONF,
35103d11
AG		 890 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
891 NETCONFA_IFINDEX_DEFAULT,
892 net->ipv6.devconf_dflt);
893 rtnl_unlock();
894 return 0;
895 }
896
897 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
898 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
899 addrconf_linkdown_change(net, newf);
900 if ((!newf) ^ (!old))
901 inet6_netconf_notify_devconf(net,
85b3daad 902 RTM_NEWNETCONF,
35103d11
AG		 903 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
904 NETCONFA_IFINDEX_ALL,
905 net->ipv6.devconf_all);
906 }
907 rtnl_unlock();
908
909 return 1;
910}
911
1da177e4
LT		 912#endif
913
5c578aed 914/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 915void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
916{
c2e21293 917 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 918
1da177e4 919#ifdef NET_REFCNT_DEBUG
91df42be 920 pr_debug("%s\n", __func__);
1da177e4
LT		 921#endif
922
923 in6_dev_put(ifp->idev);
924
c15b1cca
HFS		 925 if (cancel_delayed_work(&ifp->dad_work))
926 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
927 ifp);
1da177e4 928
e9d3e084 929 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 930 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 931 return;
932 }
1da177e4 933
e5785985 934 kfree_rcu(ifp, rcu);
1da177e4
LT		 935}
936
e55ffac6
BH		 937static void
938ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
939{
502a2ffd 940 struct list_head *p;
8a6ce0c0 941 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 942
943 /*
944 * Each device address list is sorted in order of scope -
945 * global before linklocal.
946 */
502a2ffd 947 list_for_each(p, &idev->addr_list) {
948 struct inet6_ifaddr *ifa
949 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 950 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 951 break;
952 }
953
8ef802aa 954 list_add_tail_rcu(&ifp->if_list, p);
e55ffac6
BH		 955}
956
3f27fb23 957static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
3eb84f49 958{
3f27fb23
ED		 959 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
960
961 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 962}
963
56fc709b 964static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
752a9292 965 struct net_device *dev, unsigned int hash)
56fc709b 966{
56fc709b
ED		 967 struct inet6_ifaddr *ifp;
968
969 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
970 if (!net_eq(dev_net(ifp->idev->dev), net))
971 continue;
972 if (ipv6_addr_equal(&ifp->addr, addr)) {
973 if (!dev || ifp->idev->dev == dev)
974 return true;
975 }
976 }
977 return false;
978}
979
f3d9832e
DA		 980static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
981{
3f27fb23 982 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
f3d9832e
DA		 983 int err = 0;
984
985 spin_lock(&addrconf_hash_lock);
986
987 /* Ignore adding duplicate addresses on an interface */
752a9292 988 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
e32ac250 989 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
f3d9832e 990 err = -EEXIST;
752a9292
ED		 991 } else {
992 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
f3d9832e
DA		 993 }
994
f3d9832e
DA		 995 spin_unlock(&addrconf_hash_lock);
996
997 return err;
998}
999
1da177e4
LT		 1000/* On success it returns ifp with increased reference count */
1001
1002static struct inet6_ifaddr *
e6464b8c 1003ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
de95e047 1004 bool can_block, struct netlink_ext_ack *extack)
1da177e4 1005{
f3d9832e 1006 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
e6464b8c 1007 int addr_type = ipv6_addr_type(cfg->pfx);
df789fe7 1008 struct net *net = dev_net(idev->dev);
1da177e4 1009 struct inet6_ifaddr *ifa = NULL;
360a9887 1010 struct fib6_info *f6i = NULL;
1da177e4 1011 int err = 0;
d68b8270
YH		 1012
1013 if (addr_type == IPV6_ADDR_ANY ||
1014 addr_type & IPV6_ADDR_MULTICAST ||
1015 (!(idev->dev->flags & IFF_LOOPBACK) &&
3ede0bbc 1016 !netif_is_l3_master(idev->dev) &&
d68b8270
YH		 1017 addr_type & IPV6_ADDR_LOOPBACK))
1018 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 1019
1da177e4
LT		 1020 if (idev->dead) {
1021 err = -ENODEV; /*XXX*/
f3d9832e 1022 goto out;
1da177e4
LT		 1023 }
1024
56d417b1 1025 if (idev->cnf.disable_ipv6) {
9bdd8d40 1026 err = -EACCES;
f3d9832e 1027 goto out;
9bdd8d40
BH		 1028 }
1029
ff7883ea
DA		 1030 /* validator notifier needs to be blocking;
1031 * do not call in atomic context
1032 */
1033 if (can_block) {
1034 struct in6_validator_info i6vi = {
e6464b8c 1035 .i6vi_addr = *cfg->pfx,
ff7883ea 1036 .i6vi_dev = idev,
de95e047 1037 .extack = extack,
ff7883ea
DA		 1038 };
1039
1040 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1041 err = notifier_to_errno(err);
1042 if (err < 0)
1043 goto out;
1044 }
1da177e4 1045
f3d9832e 1046 ifa = kzalloc(sizeof(*ifa), gfp_flags);
63159f29 1047 if (!ifa) {
1da177e4
LT		 1048 err = -ENOBUFS;
1049 goto out;
1050 }
1051
e6464b8c 1052 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
360a9887
DA		 1053 if (IS_ERR(f6i)) {
1054 err = PTR_ERR(f6i);
1055 f6i = NULL;
1da177e4
LT		 1056 goto out;
1057 }
1058
df789fe7
DF		 1059 if (net->ipv6.devconf_all->disable_policy ||
1060 idev->cnf.disable_policy)
360a9887 1061 f6i->dst_nopolicy = true;
df789fe7 1062
bba24896
JP		 1063 neigh_parms_data_state_setall(idev->nd_parms);
1064
e6464b8c
DA		 1065 ifa->addr = *cfg->pfx;
1066 if (cfg->peer_pfx)
1067 ifa->peer_addr = *cfg->peer_pfx;
1da177e4
LT		 1068
1069 spin_lock_init(&ifa->lock);
c15b1cca 1070 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 1071 INIT_HLIST_NODE(&ifa->addr_lst);
e6464b8c
DA		 1072 ifa->scope = cfg->scope;
1073 ifa->prefix_len = cfg->plen;
8308f3ff 1074 ifa->rt_priority = cfg->rt_priority;
e6464b8c 1075 ifa->flags = cfg->ifa_flags;
66eb9f86 1076 /* No need to add the TENTATIVE flag for addresses with NODAD */
e6464b8c 1077 if (!(cfg->ifa_flags & IFA_F_NODAD))
66eb9f86 1078 ifa->flags |= IFA_F_TENTATIVE;
e6464b8c
DA		 1079 ifa->valid_lft = cfg->valid_lft;
1080 ifa->prefered_lft = cfg->preferred_lft;
1da177e4 1081 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 1082 ifa->tokenized = false;
1da177e4 1083
360a9887 1084 ifa->rt = f6i;
57f5f544 1085
1da177e4 1086 ifa->idev = idev;
f3d9832e
DA		 1087 in6_dev_hold(idev);
1088
1da177e4 1089 /* For caller */
271201c0 1090 refcount_set(&ifa->refcnt, 1);
1da177e4 1091
f3d9832e 1092 rcu_read_lock_bh();
1da177e4 1093
f3d9832e
DA		 1094 err = ipv6_add_addr_hash(idev->dev, ifa);
1095 if (err < 0) {
1096 rcu_read_unlock_bh();
1097 goto out;
1098 }
1da177e4
LT		 1099
1100 write_lock(&idev->lock);
f3d9832e 1101
1da177e4 1102 /* Add to inet6_dev unicast addr list. */
e55ffac6 1103 ipv6_link_dev_addr(idev, ifa);
1da177e4 1104
1da177e4 1105 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 1106 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 1107 in6_ifa_hold(ifa);
1108 }
1da177e4 1109
1da177e4
LT		 1110 in6_ifa_hold(ifa);
1111 write_unlock(&idev->lock);
f3d9832e 1112
8814c4b5 1113 rcu_read_unlock_bh();
1da177e4 1114
f3d9832e
DA		 1115 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1116out:
1117 if (unlikely(err < 0)) {
360a9887 1118 fib6_info_release(f6i);
93531c67 1119
f3d9832e
DA		 1120 if (ifa) {
1121 if (ifa->idev)
1122 in6_dev_put(ifa->idev);
1123 kfree(ifa);
1124 }
1da177e4
LT		 1125 ifa = ERR_PTR(err);
1126 }
1127
1128 return ifa;
1da177e4
LT		 1129}
1130
5b84efec
TH		 1131enum cleanup_prefix_rt_t {
1132 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1133 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1134 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1135};
1136
1137/*
1138 * Check, whether the prefix for ifp would still need a prefix route
1139 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1140 * constants.
1141 *
1142 * 1) we don't purge prefix if address was not permanent.
1143 * prefix is managed by its own lifetime.
1144 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1145 * 3) if there are no addresses, delete prefix.
1146 * 4) if there are still other permanent address(es),
1147 * corresponding prefix is still permanent.
1148 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1149 * don't purge the prefix, assume user space is managing it.
1150 * 6) otherwise, update prefix lifetime to the
1151 * longest valid lifetime among the corresponding
1152 * addresses on the device.
1153 * Note: subsequent RA will update lifetime.
1154 **/
1155static enum cleanup_prefix_rt_t
1156check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1157{
1158 struct inet6_ifaddr *ifa;
1159 struct inet6_dev *idev = ifp->idev;
1160 unsigned long lifetime;
1161 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1162
1163 *expires = jiffies;
1164
1165 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1166 if (ifa == ifp)
1167 continue;
1168 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1169 ifp->prefix_len))
1170 continue;
1171 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1172 return CLEANUP_PREFIX_RT_NOP;
1173
1174 action = CLEANUP_PREFIX_RT_EXPIRE;
1175
1176 spin_lock(&ifa->lock);
1177
1178 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1179 /*
1180 * Note: Because this address is
1181 * not permanent, lifetime <
1182 * LONG_MAX / HZ here.
1183 */
1184 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1185 *expires = ifa->tstamp + lifetime * HZ;
1186 spin_unlock(&ifa->lock);
1187 }
1188
1189 return action;
1190}
1191
1192static void
1193cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1194{
93c2fb25 1195 struct fib6_info *f6i;
5b84efec 1196
93c2fb25 1197 f6i = addrconf_get_prefix_route(&ifp->addr,
5b84efec
TH		 1198 ifp->prefix_len,
1199 ifp->idev->dev,
1200 0, RTF_GATEWAY | RTF_DEFAULT);
93c2fb25 1201 if (f6i) {
5b84efec 1202 if (del_rt)
93c2fb25 1203 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
5b84efec 1204 else {
93c2fb25
DA		 1205 if (!(f6i->fib6_flags & RTF_EXPIRES))
1206 fib6_set_expires(f6i, expires);
1207 fib6_info_release(f6i);
5b84efec
TH		 1208 }
1209 }
1210}
1211
1212
1da177e4
LT		 1213/* This function wants to get referenced ifp and releases it before return */
1214
1215static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1216{
4c5ff6a6 1217 int state;
5b84efec
TH		 1218 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1219 unsigned long expires;
1da177e4 1220
c15b1cca
HFS		 1221 ASSERT_RTNL();
1222
8e8e676d 1223 spin_lock_bh(&ifp->lock);
4c5ff6a6 1224 state = ifp->state;
e9d3e084 1225 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1226 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1227
1228 if (state == INET6_IFADDR_STATE_DEAD)
1229 goto out;
1da177e4 1230
5c578aed 1231 spin_lock_bh(&addrconf_hash_lock);
1232 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1233 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1234
5b84efec 1235 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1236
1da177e4 1237 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1238 list_del(&ifp->tmp_list);
1239 if (ifp->ifpub) {
1240 in6_ifa_put(ifp->ifpub);
1241 ifp->ifpub = NULL;
1da177e4 1242 }
372e6c8f 1243 __in6_ifa_put(ifp);
1da177e4 1244 }
1da177e4 1245
5b84efec
TH		 1246 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1247 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1248
8ef802aa 1249 list_del_rcu(&ifp->if_list);
5b84efec
TH		 1250 __in6_ifa_put(ifp);
1251
1252 write_unlock_bh(&ifp->idev->lock);
1da177e4 1253
c15b1cca 1254 addrconf_del_dad_work(ifp);
b2238566 1255
1da177e4
LT		 1256 ipv6_ifa_notify(RTM_DELADDR, ifp);
1257
f88c91dd 1258 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1259
5b84efec
TH		 1260 if (action != CLEANUP_PREFIX_RT_NOP) {
1261 cleanup_prefix_route(ifp, expires,
1262 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1263 }
1264
c3968a85
DW		 1265 /* clean up prefsrc entries */
1266 rt6_remove_prefsrc(ifp);
4c5ff6a6 1267out:
1da177e4
LT		 1268 in6_ifa_put(ifp);
1269}
1270
fffcefe9
ED		 1271static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp,
1272 struct inet6_ifaddr *ift,
1273 bool block)
1da177e4
LT		 1274{
1275 struct inet6_dev *idev = ifp->idev;
1276 struct in6_addr addr, *tmpaddr;
e6464b8c 1277 unsigned long tmp_tstamp, age;
eac55bf9 1278 unsigned long regen_advance;
e6464b8c 1279 struct ifa6_config cfg;
1da177e4 1280 int ret = 0;
76f793e3 1281 unsigned long now = jiffies;
76506a98 1282 long max_desync_factor;
7aa8e63f 1283 s32 cnf_temp_preferred_lft;
1da177e4 1284
53bd6749 1285 write_lock_bh(&idev->lock);
1da177e4
LT		 1286 if (ift) {
1287 spin_lock_bh(&ift->lock);
1288 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1289 spin_unlock_bh(&ift->lock);
1290 tmpaddr = &addr;
1291 } else {
1292 tmpaddr = NULL;
1293 }
1294retry:
1295 in6_dev_hold(idev);
1296 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1297 write_unlock_bh(&idev->lock);
f3213831 1298 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1299 in6_dev_put(idev);
1300 ret = -1;
1301 goto out;
1302 }
1303 spin_lock_bh(&ifp->lock);
1304 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1305 idev->cnf.use_tempaddr = -1; /*XXX*/
1306 spin_unlock_bh(&ifp->lock);
53bd6749 1307 write_unlock_bh(&idev->lock);
f3213831
JP		 1308 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1309 __func__);
1da177e4
LT		 1310 in6_dev_put(idev);
1311 ret = -1;
1312 goto out;
1313 }
1314 in6_ifa_hold(ifp);
1315 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
9d6280da 1316 ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1317 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1318 age = (now - ifp->tstamp) / HZ;
76506a98
JB		 1319
1320 regen_advance = idev->cnf.regen_max_retry *
1321 idev->cnf.dad_transmits *
1322 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1323
1324 /* recalculate max_desync_factor each time and update
1325 * idev->desync_factor if it's larger
1326 */
7aa8e63f 1327 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
76506a98
JB		 1328 max_desync_factor = min_t(__u32,
1329 idev->cnf.max_desync_factor,
7aa8e63f 1330 cnf_temp_preferred_lft - regen_advance);
76506a98
JB		 1331
1332 if (unlikely(idev->desync_factor > max_desync_factor)) {
1333 if (max_desync_factor > 0) {
1334 get_random_bytes(&idev->desync_factor,
1335 sizeof(idev->desync_factor));
1336 idev->desync_factor %= max_desync_factor;
1337 } else {
1338 idev->desync_factor = 0;
1339 }
1340 }
1341
3f2d67b6 1342 memset(&cfg, 0, sizeof(cfg));
e6464b8c 1343 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
7a876b0e 1344 idev->cnf.temp_valid_lft + age);
e6464b8c
DA		 1345 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1346 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1347
1348 cfg.plen = ifp->prefix_len;
1da177e4
LT		 1349 tmp_tstamp = ifp->tstamp;
1350 spin_unlock_bh(&ifp->lock);
1351
53bd6749 1352 write_unlock_bh(&idev->lock);
95c385b4 1353
eac55bf9
BB		 1354 /* A temporary address is created only if this calculated Preferred
1355 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1356 * an implementation must not create a temporary address with a zero
1357 * Preferred Lifetime.
ecab6701
HK		 1358 * Use age calculation as in addrconf_verify to avoid unnecessary
1359 * temporary addresses being generated.
eac55bf9 1360 */
ecab6701 1361 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
e6464b8c 1362 if (cfg.preferred_lft <= regen_advance + age) {
eac55bf9
BB		 1363 in6_ifa_put(ifp);
1364 in6_dev_put(idev);
1365 ret = -1;
1366 goto out;
1367 }
1368
e6464b8c 1369 cfg.ifa_flags = IFA_F_TEMPORARY;
95c385b4
NH		 1370 /* set in addrconf_prefix_rcv() */
1371 if (ifp->flags & IFA_F_OPTIMISTIC)
e6464b8c 1372 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
95c385b4 1373
e6464b8c
DA		 1374 cfg.pfx = &addr;
1375 cfg.scope = ipv6_addr_scope(cfg.pfx);
95c385b4 1376
e6464b8c 1377 ift = ipv6_add_addr(idev, &cfg, block, NULL);
4b08a8f1 1378 if (IS_ERR(ift)) {
1da177e4
LT		 1379 in6_ifa_put(ifp);
1380 in6_dev_put(idev);
f3213831 1381 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1382 tmpaddr = &addr;
53bd6749 1383 write_lock_bh(&idev->lock);
1da177e4
LT		 1384 goto retry;
1385 }
1386
1387 spin_lock_bh(&ift->lock);
1388 ift->ifpub = ifp;
76f793e3 1389 ift->cstamp = now;
1da177e4
LT		 1390 ift->tstamp = tmp_tstamp;
1391 spin_unlock_bh(&ift->lock);
1392
cf22f9a2 1393 addrconf_dad_start(ift);
1da177e4
LT		 1394 in6_ifa_put(ift);
1395 in6_dev_put(idev);
1396out:
1397 return ret;
1398}
1da177e4
LT		 1399
1400/*
072047e4 1401 * Choose an appropriate source address (RFC3484)
1da177e4 1402 */
a9b05723
YH		 1403enum {
1404 IPV6_SADDR_RULE_INIT = 0,
1405 IPV6_SADDR_RULE_LOCAL,
1406 IPV6_SADDR_RULE_SCOPE,
1407 IPV6_SADDR_RULE_PREFERRED,
1408#ifdef CONFIG_IPV6_MIP6
1409 IPV6_SADDR_RULE_HOA,
1410#endif
1411 IPV6_SADDR_RULE_OIF,
1412 IPV6_SADDR_RULE_LABEL,
a9b05723 1413 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1414 IPV6_SADDR_RULE_ORCHID,
1415 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1416#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1417 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1418#endif
a9b05723
YH		 1419 IPV6_SADDR_RULE_MAX
1420};
1421
072047e4 1422struct ipv6_saddr_score {
a9b05723
YH		 1423 int rule;
1424 int addr_type;
1425 struct inet6_ifaddr *ifa;
1426 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1427 int scopedist;
1428 int matchlen;
072047e4
YH		 1429};
1430
a9b05723 1431struct ipv6_saddr_dst {
9acd9f3a 1432 const struct in6_addr *addr;
a9b05723
YH		 1433 int ifindex;
1434 int scope;
1435 int label;
7cbca67c 1436 unsigned int prefs;
a9b05723 1437};
072047e4 1438
b6f99a21 1439static inline int ipv6_saddr_preferred(int type)
1da177e4 1440{
45bb0060 1441 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1442 return 1;
1443 return 0;
1da177e4
LT		 1444}
1445
35e015e1
MC		 1446static bool ipv6_use_optimistic_addr(struct net *net,
1447 struct inet6_dev *idev)
7fd2561e
EK		 1448{
1449#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 1450 if (!idev)
1451 return false;
1452 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1453 return false;
1454 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1455 return false;
1456
1457 return true;
7fd2561e
EK		 1458#else
1459 return false;
1460#endif
1461}
1462
f1c02cfb
SD		 1463static bool ipv6_allow_optimistic_dad(struct net *net,
1464 struct inet6_dev *idev)
1465{
1466#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1467 if (!idev)
1468 return false;
1469 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1470 return false;
1471
1472 return true;
1473#else
1474 return false;
1475#endif
1476}
1477
3de23255
BT		 1478static int ipv6_get_saddr_eval(struct net *net,
1479 struct ipv6_saddr_score *score,
a9b05723
YH		 1480 struct ipv6_saddr_dst *dst,
1481 int i)
1482{
1483 int ret;
1484
1485 if (i <= score->rule) {
1486 switch (i) {
1487 case IPV6_SADDR_RULE_SCOPE:
1488 ret = score->scopedist;
1489 break;
1490 case IPV6_SADDR_RULE_PREFIX:
1491 ret = score->matchlen;
1492 break;
1493 default:
1494 ret = !!test_bit(i, score->scorebits);
1495 }
1496 goto out;
1497 }
1498
1499 switch (i) {
1500 case IPV6_SADDR_RULE_INIT:
1501 /* Rule 0: remember if hiscore is not ready yet */
1502 ret = !!score->ifa;
1503 break;
1504 case IPV6_SADDR_RULE_LOCAL:
1505 /* Rule 1: Prefer same address */
1506 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1507 break;
1508 case IPV6_SADDR_RULE_SCOPE:
1509 /* Rule 2: Prefer appropriate scope
1510 *
1511 * ret
1512 * ^
1513 * -1 | d 15
1514 * ---+--+-+---> scope
1515 * |
1516 * | d is scope of the destination.
1517 * B-d | \
1518 * | \ <- smaller scope is better if
db9c7c39 1519 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1520 * | ret = B - scope (-1 <= scope >= d <= 15).
1521 * d-C-1 | /
1522 * |/ <- greater is better
1523 * -C / if scope is not enough for destination.
1524 * /| ret = scope - C (-1 <= d < scope <= 15).
1525 *
1526 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1527 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1528 * Assume B = 0 and we get C > 29.
1529 */
1530 ret = __ipv6_addr_src_scope(score->addr_type);
1531 if (ret >= dst->scope)
1532 ret = -ret;
1533 else
1534 ret -= 128; /* 30 is enough */
1535 score->scopedist = ret;
1536 break;
1537 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1538 {
a9b05723 1539 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1540 u8 avoid = IFA_F_DEPRECATED;
1541
35e015e1 1542 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
7fd2561e 1543 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1544 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1545 !(score->ifa->flags & avoid);
a9b05723 1546 break;
7fd2561e 1547 }
a9b05723
YH		 1548#ifdef CONFIG_IPV6_MIP6
1549 case IPV6_SADDR_RULE_HOA:
7cbca67c 1550 {
a9b05723 1551 /* Rule 4: Prefer home address */
7cbca67c
YH		 1552 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1553 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1554 break;
7cbca67c 1555 }
a9b05723
YH		 1556#endif
1557 case IPV6_SADDR_RULE_OIF:
1558 /* Rule 5: Prefer outgoing interface */
1559 ret = (!dst->ifindex ||
1560 dst->ifindex == score->ifa->idev->dev->ifindex);
1561 break;
1562 case IPV6_SADDR_RULE_LABEL:
1563 /* Rule 6: Prefer matching label */
3de23255
BT		 1564 ret = ipv6_addr_label(net,
1565 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1566 score->ifa->idev->dev->ifindex) == dst->label;
1567 break;
a9b05723 1568 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1569 {
a9b05723 1570 /* Rule 7: Prefer public address
25985edc 1571 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1572 */
7cbca67c
YH		 1573 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1574 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1575 score->ifa->idev->cnf.use_tempaddr >= 2;
1576 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1577 break;
7cbca67c 1578 }
a9b05723
YH		 1579 case IPV6_SADDR_RULE_ORCHID:
1580 /* Rule 8-: Prefer ORCHID vs ORCHID or
1581 * non-ORCHID vs non-ORCHID
1582 */
1583 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1584 ipv6_addr_orchid(dst->addr));
1585 break;
1586 case IPV6_SADDR_RULE_PREFIX:
1587 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1588 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1589 if (ret > score->ifa->prefix_len)
1590 ret = score->ifa->prefix_len;
1591 score->matchlen = ret;
a9b05723 1592 break;
7fd2561e
EK		 1593#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1594 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1595 /* Optimistic addresses still have lower precedence than other
1596 * preferred addresses.
1597 */
1598 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1599 break;
1600#endif
a9b05723
YH		 1601 default:
1602 ret = 0;
1603 }
1604
1605 if (ret)
1606 __set_bit(i, score->scorebits);
1607 score->rule = i;
1608out:
1609 return ret;
1610}
1611
c0b8da1e
YH		 1612static int __ipv6_dev_get_saddr(struct net *net,
1613 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1614 struct inet6_dev *idev,
1615 struct ipv6_saddr_score *scores,
1616 int hiscore_idx)
9131f3de 1617{
c0b8da1e 1618 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de 1619
f59c031e 1620 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
9131f3de
YH		 1621 int i;
1622
1623 /*
1624 * - Tentative Address (RFC2462 section 5.4)
1625 * - A tentative address is not considered
1626 * "assigned to an interface" in the traditional
1627 * sense, unless it is also flagged as optimistic.
1628 * - Candidate Source Address (section 4)
1629 * - In any case, anycast addresses, multicast
1630 * addresses, and the unspecified address MUST
1631 * NOT be included in a candidate set.
1632 */
1633 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1634 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1635 continue;
1636
1637 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1638
1639 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1640 score->addr_type & IPV6_ADDR_MULTICAST)) {
1641 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1642 idev->dev->name);
1643 continue;
1644 }
1645
1646 score->rule = -1;
1647 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1648
1649 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1650 int minihiscore, miniscore;
1651
1652 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1653 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1654
1655 if (minihiscore > miniscore) {
1656 if (i == IPV6_SADDR_RULE_SCOPE &&
1657 score->scopedist > 0) {
1658 /*
1659 * special case:
1660 * each remaining entry
1661 * has too small (not enough)
1662 * scope, because ifa entries
1663 * are sorted by their scope
1664 * values.
1665 */
1666 goto out;
1667 }
1668 break;
1669 } else if (minihiscore < miniscore) {
9131f3de 1670 swap(hiscore, score);
c0b8da1e 1671 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1672
1673 /* restore our iterator */
1674 score->ifa = hiscore->ifa;
1675
1676 break;
1677 }
1678 }
1679 }
1680out:
c0b8da1e 1681 return hiscore_idx;
9131f3de
YH		 1682}
1683
afbac601
DA		 1684static int ipv6_get_saddr_master(struct net *net,
1685 const struct net_device *dst_dev,
1686 const struct net_device *master,
1687 struct ipv6_saddr_dst *dst,
1688 struct ipv6_saddr_score *scores,
1689 int hiscore_idx)
1690{
1691 struct inet6_dev *idev;
1692
1693 idev = __in6_dev_get(dst_dev);
1694 if (idev)
1695 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1696 scores, hiscore_idx);
1697
1698 idev = __in6_dev_get(master);
1699 if (idev)
1700 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1701 scores, hiscore_idx);
1702
1703 return hiscore_idx;
1704}
1705
b3f644fc 1706int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1707 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1708 struct in6_addr *saddr)
1da177e4 1709{
c0b8da1e 1710 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1711 struct ipv6_saddr_dst dst;
9131f3de 1712 struct inet6_dev *idev;
072047e4 1713 struct net_device *dev;
a9b05723 1714 int dst_type;
9131f3de 1715 bool use_oif_addr = false;
c0b8da1e 1716 int hiscore_idx = 0;
cc429c8f 1717 int ret = 0;
1da177e4 1718
a9b05723
YH		 1719 dst_type = __ipv6_addr_type(daddr);
1720 dst.addr = daddr;
1721 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1722 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1723 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1724 dst.prefs = prefs;
a9b05723 1725
c0b8da1e
YH		 1726 scores[hiscore_idx].rule = -1;
1727 scores[hiscore_idx].ifa = NULL;
1da177e4 1728
8814c4b5 1729 rcu_read_lock();
1da177e4 1730
9131f3de
YH		 1731 /* Candidate Source Address (section 4)
1732 * - multicast and link-local destination address,
1733 * the set of candidate source address MUST only
1734 * include addresses assigned to interfaces
1735 * belonging to the same link as the outgoing
1736 * interface.
1737 * (- For site-local destination addresses, the
1738 * set of candidate source addresses MUST only
1739 * include addresses assigned to interfaces
1740 * belonging to the same site as the outgoing
1741 * interface.)
3985e8a3
EK		 1742 * - "It is RECOMMENDED that the candidate source addresses
1743 * be the set of unicast addresses assigned to the
1744 * interface that will be used to send to the destination
1745 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1746 */
1747 if (dst_dev) {
3985e8a3 1748 idev = __in6_dev_get(dst_dev);
9131f3de 1749 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1750 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1751 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1752 use_oif_addr = true;
1753 }
1754 }
a9b05723 1755
9131f3de 1756 if (use_oif_addr) {
c0b8da1e 1757 if (idev)
c15df306 1758 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de 1759 } else {
afbac601
DA		 1760 const struct net_device *master;
1761 int master_idx = 0;
1762
1763 /* if dst_dev exists and is enslaved to an L3 device, then
1764 * prefer addresses from dst_dev and then the master over
1765 * any other enslaved devices in the L3 domain.
1766 */
1767 master = l3mdev_master_dev_rcu(dst_dev);
1768 if (master) {
1769 master_idx = master->ifindex;
1770
1771 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1772 master, &dst,
1773 scores, hiscore_idx);
1774
1775 if (scores[hiscore_idx].ifa)
1776 goto out;
1777 }
1778
9131f3de 1779 for_each_netdev_rcu(net, dev) {
afbac601
DA		 1780 /* only consider addresses on devices in the
1781 * same L3 domain
1782 */
1783 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1784 continue;
9131f3de
YH		 1785 idev = __in6_dev_get(dev);
1786 if (!idev)
072047e4 1787 continue;
c15df306 1788 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1789 }
1790 }
afbac601
DA		 1791
1792out:
c0b8da1e 1793 hiscore = &scores[hiscore_idx];
a9b05723 1794 if (!hiscore->ifa)
cc429c8f
ED		 1795 ret = -EADDRNOTAVAIL;
1796 else
1797 *saddr = hiscore->ifa->addr;
1ab1457c 1798
cc429c8f
ED		 1799 rcu_read_unlock();
1800 return ret;
1da177e4 1801}
5e5f3f0f 1802EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1803
8965779d 1804int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1805 u32 banned_flags)
b7b1bfce
HFS		 1806{
1807 struct inet6_ifaddr *ifp;
1808 int err = -EADDRNOTAVAIL;
1809
602582ca
HFS		 1810 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1811 if (ifp->scope > IFA_LINK)
1812 break;
b7b1bfce
HFS		 1813 if (ifp->scope == IFA_LINK &&
1814 !(ifp->flags & banned_flags)) {
1815 *addr = ifp->addr;
1816 err = 0;
1817 break;
1818 }
1819 }
1820 return err;
1821}
1822
95c385b4 1823int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1824 u32 banned_flags)
1da177e4
LT		 1825{
1826 struct inet6_dev *idev;
1827 int err = -EADDRNOTAVAIL;
1828
8814c4b5 1829 rcu_read_lock();
e21e8467
SH		 1830 idev = __in6_dev_get(dev);
1831 if (idev) {
1da177e4 1832 read_lock_bh(&idev->lock);
b7b1bfce 1833 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1834 read_unlock_bh(&idev->lock);
1835 }
8814c4b5 1836 rcu_read_unlock();
1da177e4
LT		 1837 return err;
1838}
1839
d9bf82c2 1840static int ipv6_count_addresses(const struct inet6_dev *idev)
1da177e4 1841{
d9bf82c2 1842 const struct inet6_ifaddr *ifp;
1da177e4 1843 int cnt = 0;
1da177e4 1844
d9bf82c2
ED		 1845 rcu_read_lock();
1846 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1da177e4 1847 cnt++;
d9bf82c2 1848 rcu_read_unlock();
1da177e4
LT		 1849 return cnt;
1850}
1851
b71d1d42 1852int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1853 const struct net_device *dev, int strict)
c58da4c6 1854{
232378e8
DA		 1855 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1856 strict, IFA_F_TENTATIVE);
c58da4c6
EK		 1857}
1858EXPORT_SYMBOL(ipv6_chk_addr);
1859
1893ff20
DA		 1860/* device argument is used to find the L3 domain of interest. If
1861 * skip_dev_check is set, then the ifp device is not checked against
1862 * the passed in dev argument. So the 2 cases for addresses checks are:
1863 * 1. does the address exist in the L3 domain that dev is part of
1864 * (skip_dev_check = true), or
1865 *
1866 * 2. does the address exist on the specific device
1867 * (skip_dev_check = false)
1868 */
c58da4c6 1869int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
232378e8
DA		 1870 const struct net_device *dev, bool skip_dev_check,
1871 int strict, u32 banned_flags)
1da177e4 1872{
3f27fb23 1873 unsigned int hash = inet6_addr_hash(net, addr);
1893ff20 1874 const struct net_device *l3mdev;
eedf042a 1875 struct inet6_ifaddr *ifp;
c58da4c6 1876 u32 ifp_flags;
1da177e4 1877
480318a0 1878 rcu_read_lock();
232378e8 1879
1893ff20 1880 l3mdev = l3mdev_master_dev_rcu(dev);
232378e8
DA		 1881 if (skip_dev_check)
1882 dev = NULL;
1883
b67bfe0d 1884 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1885 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1886 continue;
1893ff20
DA		 1887
1888 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev)
1889 continue;
1890
c58da4c6
EK		 1891 /* Decouple optimistic from tentative for evaluation here.
1892 * Ban optimistic addresses explicitly, when required.
1893 */
1894 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1895 ? (ifp->flags&~IFA_F_TENTATIVE)
1896 : ifp->flags;
1da177e4 1897 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1898 !(ifp_flags&banned_flags) &&
63159f29 1899 (!dev || ifp->idev->dev == dev ||
eedf042a 1900 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
480318a0 1901 rcu_read_unlock();
eedf042a 1902 return 1;
1da177e4
LT		 1903 }
1904 }
5c578aed 1905
480318a0 1906 rcu_read_unlock();
eedf042a 1907 return 0;
1da177e4 1908}
c58da4c6 1909EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1910
1da177e4 1911
7df37ff3
CB		 1912/* Compares an address/prefix_len with addresses on device @dev.
1913 * If one is found it returns true.
1914 */
1915bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1916 const unsigned int prefix_len, struct net_device *dev)
1917{
47e26941
ED		 1918 const struct inet6_ifaddr *ifa;
1919 const struct inet6_dev *idev;
7df37ff3
CB		 1920 bool ret = false;
1921
1922 rcu_read_lock();
1923 idev = __in6_dev_get(dev);
1924 if (idev) {
47e26941 1925 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
7df37ff3
CB		 1926 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1927 if (ret)
1928 break;
1929 }
7df37ff3
CB		 1930 }
1931 rcu_read_unlock();
1932
1933 return ret;
1934}
1935EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1936
b71d1d42 1937int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84 1938{
24ba333b
ED		 1939 const struct inet6_ifaddr *ifa;
1940 const struct inet6_dev *idev;
52eeeb84
YH		 1941 int onlink;
1942
1943 onlink = 0;
1944 rcu_read_lock();
1945 idev = __in6_dev_get(dev);
1946 if (idev) {
24ba333b 1947 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1948 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1949 ifa->prefix_len);
1950 if (onlink)
1951 break;
1952 }
52eeeb84
YH		 1953 }
1954 rcu_read_unlock();
1955 return onlink;
1956}
52eeeb84
YH		 1957EXPORT_SYMBOL(ipv6_chk_prefix);
1958
9acd9f3a 1959struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1960 struct net_device *dev, int strict)
1da177e4 1961{
3f27fb23 1962 unsigned int hash = inet6_addr_hash(net, addr);
b79d1d54 1963 struct inet6_ifaddr *ifp, *result = NULL;
1da177e4 1964
24f226da
ED		 1965 rcu_read_lock();
1966 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1967 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1968 continue;
1da177e4 1969 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1970 if (!dev || ifp->idev->dev == dev ||
1da177e4 1971 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1972 result = ifp;
1da177e4
LT		 1973 in6_ifa_hold(ifp);
1974 break;
1975 }
1976 }
1977 }
24f226da 1978 rcu_read_unlock();
1da177e4 1979
b79d1d54 1980 return result;
1da177e4
LT		 1981}
1982
1da177e4
LT		 1983/* Gets referenced address, destroys ifaddr */
1984
cc411d0b 1985static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1986{
3d171f39
LR		 1987 if (dad_failed)
1988 ifp->flags |= IFA_F_DADFAILED;
1989
ec8add2a 1990 if (ifp->flags&IFA_F_TEMPORARY) {
1da177e4
LT		 1991 struct inet6_ifaddr *ifpub;
1992 spin_lock_bh(&ifp->lock);
1993 ifpub = ifp->ifpub;
1994 if (ifpub) {
1995 in6_ifa_hold(ifpub);
1996 spin_unlock_bh(&ifp->lock);
fffcefe9 1997 ipv6_create_tempaddr(ifpub, ifp, true);
1da177e4
LT		 1998 in6_ifa_put(ifpub);
1999 } else {
2000 spin_unlock_bh(&ifp->lock);
2001 }
2002 ipv6_del_addr(ifp);
ec8add2a
SD		 2003 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2004 spin_lock_bh(&ifp->lock);
2005 addrconf_del_dad_work(ifp);
2006 ifp->flags |= IFA_F_TENTATIVE;
f1c02cfb
SD		 2007 if (dad_failed)
2008 ifp->flags &= ~IFA_F_OPTIMISTIC;
ec8add2a
SD		 2009 spin_unlock_bh(&ifp->lock);
2010 if (dad_failed)
2011 ipv6_ifa_notify(0, ifp);
2012 in6_ifa_put(ifp);
c15b1cca 2013 } else {
1da177e4 2014 ipv6_del_addr(ifp);
c15b1cca 2015 }
1da177e4
LT		 2016}
2017
f2344a13
HX		 2018static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2019{
2020 int err = -ENOENT;
2021
8e8e676d 2022 spin_lock_bh(&ifp->lock);
f2344a13
HX		 2023 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2024 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2025 err = 0;
2026 }
8e8e676d 2027 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 2028
2029 return err;
2030}
2031
da13c59b 2032void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
3c21edbd 2033{
1b34be74 2034 struct inet6_dev *idev = ifp->idev;
1855b7c3 2035 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 2036
853dc2e0
UB		 2037 if (addrconf_dad_end(ifp)) {
2038 in6_ifa_put(ifp);
f2344a13 2039 return;
853dc2e0 2040 }
f2344a13 2041
da13c59b
VP		 2042 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2043 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
9bdd8d40 2044
5f40ef77
HFS		 2045 spin_lock_bh(&ifp->lock);
2046
2047 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
5f40ef77
HFS		 2048 struct in6_addr new_addr;
2049 struct inet6_ifaddr *ifp2;
5f40ef77 2050 int retries = ifp->stable_privacy_retry + 1;
e6464b8c
DA		 2051 struct ifa6_config cfg = {
2052 .pfx = &new_addr,
2053 .plen = ifp->prefix_len,
2054 .ifa_flags = ifp->flags,
2055 .valid_lft = ifp->valid_lft,
2056 .preferred_lft = ifp->prefered_lft,
2057 .scope = ifp->scope,
2058 };
5f40ef77 2059
1855b7c3 2060 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 2061 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2062 ifp->idev->dev->name);
2063 goto errdad;
2064 }
2065
2066 new_addr = ifp->addr;
2067 if (ipv6_generate_stable_address(&new_addr, retries,
2068 idev))
2069 goto errdad;
2070
5f40ef77 2071 spin_unlock_bh(&ifp->lock);
1b34be74 2072
5f40ef77
HFS		 2073 if (idev->cnf.max_addresses &&
2074 ipv6_count_addresses(idev) >=
2075 idev->cnf.max_addresses)
2076 goto lock_errdad;
2077
2078 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2079 ifp->idev->dev->name);
2080
e6464b8c 2081 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
5f40ef77
HFS		 2082 if (IS_ERR(ifp2))
2083 goto lock_errdad;
2084
2085 spin_lock_bh(&ifp2->lock);
2086 ifp2->stable_privacy_retry = retries;
2087 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2088 spin_unlock_bh(&ifp2->lock);
2089
1855b7c3 2090 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 2091 in6_ifa_put(ifp2);
2092lock_errdad:
2093 spin_lock_bh(&ifp->lock);
1b34be74
YH		 2094 }
2095
5f40ef77 2096errdad:
c15b1cca
HFS		 2097 /* transition from _POSTDAD to _ERRDAD */
2098 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 2099 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 2100
2101 addrconf_mod_dad_work(ifp, 0);
751eb6b6 2102 in6_ifa_put(ifp);
3c21edbd 2103}
1da177e4 2104
a9ed4a29
SD		 2105/* Join to solicited addr multicast group.
2106 * caller must hold RTNL */
b71d1d42 2107void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 2108{
2109 struct in6_addr maddr;
2110
2111 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2112 return;
2113
2114 addrconf_addr_solict_mult(addr, &maddr);
2115 ipv6_dev_mc_inc(dev, &maddr);
2116}
2117
a9ed4a29 2118/* caller must hold RTNL */
b71d1d42 2119void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 2120{
2121 struct in6_addr maddr;
2122
2123 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2124 return;
2125
2126 addrconf_addr_solict_mult(addr, &maddr);
2127 __ipv6_dev_mc_dec(idev, &maddr);
2128}
2129
a9ed4a29 2130/* caller must hold RTNL */
20380731 2131static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2132{
2133 struct in6_addr addr;
c15b1cca 2134
88ad3149 2135 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 2136 return;
1da177e4
LT		 2137 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2138 if (ipv6_addr_any(&addr))
2139 return;
013b4d90 2140 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 2141}
2142
a9ed4a29 2143/* caller must hold RTNL */
20380731 2144static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2145{
2146 struct in6_addr addr;
c15b1cca 2147
88ad3149 2148 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 2149 return;
1da177e4
LT		 2150 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2151 if (ipv6_addr_any(&addr))
2152 return;
2153 __ipv6_dev_ac_dec(ifp->idev, &addr);
2154}
2155
8a7a4b47 2156static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
06a4c1c5 2157{
8a7a4b47
AA		 2158 switch (dev->addr_len) {
2159 case ETH_ALEN:
9dae2e03
LAD		 2160 memcpy(eui, dev->dev_addr, 3);
2161 eui[3] = 0xFF;
2162 eui[4] = 0xFE;
2163 memcpy(eui + 5, dev->dev_addr + 3, 3);
2164 break;
8a7a4b47
AA		 2165 case EUI64_ADDR_LEN:
2166 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2167 eui[0] ^= 2;
2168 break;
2169 default:
06a4c1c5 2170 return -1;
8a7a4b47
AA		 2171 }
2172
06a4c1c5 2173 return 0;
2174}
2175
cb6bf355
YH		 2176static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2177{
2178 union fwnet_hwaddr *ha;
2179
2180 if (dev->addr_len != FWNET_ALEN)
2181 return -1;
2182
2183 ha = (union fwnet_hwaddr *)dev->dev_addr;
2184
2185 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2186 eui[0] ^= 2;
2187 return 0;
2188}
2189
073a8e0e
YH		 2190static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2191{
2192 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2193 if (dev->addr_len != ARCNET_ALEN)
2194 return -1;
2195 memset(eui, 0, 7);
8e5e8f30 2196 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 2197 return 0;
2198}
2199
2200static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2201{
2202 if (dev->addr_len != INFINIBAND_ALEN)
2203 return -1;
2204 memcpy(eui, dev->dev_addr + 12, 8);
2205 eui[0] |= 2;
2206 return 0;
2207}
2208
c61393ea 2209static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2210{
9af28511
SH		 2211 if (addr == 0)
2212 return -1;
dfd982ba
YH		 2213 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2214 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2215 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2216 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2217 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2218 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2219 eui[1] = 0;
2220 eui[2] = 0x5E;
2221 eui[3] = 0xFE;
2222 memcpy(eui + 4, &addr, 4);
2223 return 0;
2224}
dfd982ba
YH		 2225
2226static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2227{
2228 if (dev->priv_flags & IFF_ISATAP)
2229 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2230 return -1;
2231}
2232
aee80b54 2233static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2234{
2235 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2236}
2237
e837735e
ND		 2238static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2239{
2240 memcpy(eui, dev->perm_addr, 3);
2241 memcpy(eui + 5, dev->perm_addr + 3, 3);
2242 eui[3] = 0xFF;
2243 eui[4] = 0xFE;
2244 eui[0] ^= 2;
2245 return 0;
2246}
2247
1da177e4
LT		 2248static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2249{
2250 switch (dev->type) {
2251 case ARPHRD_ETHER:
2252 case ARPHRD_FDDI:
073a8e0e 2253 return addrconf_ifid_eui48(eui, dev);
1da177e4 2254 case ARPHRD_ARCNET:
073a8e0e 2255 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2256 case ARPHRD_INFINIBAND:
073a8e0e 2257 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2258 case ARPHRD_SIT:
dfd982ba 2259 return addrconf_ifid_sit(eui, dev);
aee80b54 2260 case ARPHRD_IPGRE:
45ce0fd1 2261 case ARPHRD_TUNNEL:
aee80b54 2262 return addrconf_ifid_gre(eui, dev);
e74bccb8 2263 case ARPHRD_6LOWPAN:
8a7a4b47 2264 return addrconf_ifid_6lowpan(eui, dev);
cb6bf355
YH		 2265 case ARPHRD_IEEE1394:
2266 return addrconf_ifid_ieee1394(eui, dev);
e837735e 2267 case ARPHRD_TUNNEL6:
45ce0fd1 2268 case ARPHRD_IP6GRE:
9deb441c 2269 case ARPHRD_RAWIP:
e837735e 2270 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2271 }
2272 return -1;
2273}
2274
2275static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2276{
2277 int err = -1;
2278 struct inet6_ifaddr *ifp;
2279
2280 read_lock_bh(&idev->lock);
602582ca
HFS		 2281 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2282 if (ifp->scope > IFA_LINK)
2283 break;
1da177e4
LT		 2284 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2285 memcpy(eui, ifp->addr.s6_addr+8, 8);
2286 err = 0;
2287 break;
2288 }
2289 }
2290 read_unlock_bh(&idev->lock);
2291 return err;
2292}
2293
1da177e4 2294/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
9d6280da 2295static void ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2296{
1da177e4 2297regen:
955189ef 2298 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2299 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2300
2301 /*
2302 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2303 * check if generated address is not inappropriate
2304 *
2305 * - Reserved subnet anycast (RFC 2526)
2306 * 11111101 11....11 1xxxxxxx
c7dc89c0 2307 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2308 * 00-00-5E-FE-xx-xx-xx-xx
2309 * - value 0
2310 * - XXX: already assigned to an address on the device
2311 */
1ab1457c 2312 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2313 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2314 (idev->rndid[7]&0x80))
2315 goto regen;
2316 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2317 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2318 goto regen;
2319 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2320 goto regen;
2321 }
1da177e4
LT		 2322}
2323
9d6280da 2324static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2325{
1da177e4 2326 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
9d6280da 2327 ipv6_regen_rndid(idev);
1da177e4 2328}
1da177e4
LT		 2329
2330/*
2331 * Add prefix route.
2332 */
2333
2334static void
8308f3ff
DA		 2335addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2336 struct net_device *dev, unsigned long expires,
2337 u32 flags, gfp_t gfp_flags)
1da177e4 2338{
86872cb5 2339 struct fib6_config cfg = {
ca254490 2340 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
8308f3ff 2341 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
86872cb5
TG		 2342 .fc_ifindex = dev->ifindex,
2343 .fc_expires = expires,
2344 .fc_dst_len = plen,
2345 .fc_flags = RTF_UP | flags,
c346dca1 2346 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2347 .fc_protocol = RTPROT_KERNEL,
e8478e80 2348 .fc_type = RTN_UNICAST,
86872cb5 2349 };
1da177e4 2350
4e3fd7a0 2351 cfg.fc_dst = *pfx;
1da177e4
LT		 2352
2353 /* Prevent useless cloning on PtP SIT.
2354 This thing is done here expecting that the whole
2355 class of non-broadcast devices need not cloning.
2356 */
07a93626 2357#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2358 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2359 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2360#endif
1da177e4 2361
acb54e3c 2362 ip6_route_add(&cfg, gfp_flags, NULL);
1da177e4
LT		 2363}
2364
14ef37b6 2365
8d1c802b 2366static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
14ef37b6
AH		 2367 int plen,
2368 const struct net_device *dev,
2369 u32 flags, u32 noflags)
2370{
2371 struct fib6_node *fn;
8d1c802b 2372 struct fib6_info *rt = NULL;
14ef37b6 2373 struct fib6_table *table;
ca254490 2374 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2375
ca254490 2376 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2377 if (!table)
14ef37b6
AH		 2378 return NULL;
2379
66f5d6ce 2380 rcu_read_lock();
38fbeeee 2381 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
14ef37b6
AH		 2382 if (!fn)
2383 goto out;
1f56a01f 2384
66f5d6ce 2385 for_each_fib6_node_rt_rcu(fn) {
5e670d84 2386 if (rt->fib6_nh.nh_dev->ifindex != dev->ifindex)
14ef37b6 2387 continue;
93c2fb25 2388 if ((rt->fib6_flags & flags) != flags)
14ef37b6 2389 continue;
93c2fb25 2390 if ((rt->fib6_flags & noflags) != 0)
14ef37b6 2391 continue;
e873e4b9
WW		 2392 if (!fib6_info_hold_safe(rt))
2393 continue;
14ef37b6
AH		 2394 break;
2395 }
2396out:
66f5d6ce 2397 rcu_read_unlock();
14ef37b6
AH		 2398 return rt;
2399}
2400
2401
1da177e4
LT		 2402/* Create "default" multicast route to the interface */
2403
2404static void addrconf_add_mroute(struct net_device *dev)
2405{
86872cb5 2406 struct fib6_config cfg = {
ca254490 2407 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2408 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2409 .fc_ifindex = dev->ifindex,
2410 .fc_dst_len = 8,
2411 .fc_flags = RTF_UP,
e8478e80 2412 .fc_type = RTN_UNICAST,
c346dca1 2413 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2414 };
2415
2416 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2417
e500c6d3 2418 ip6_route_add(&cfg, GFP_KERNEL, NULL);
1da177e4
LT		 2419}
2420
1da177e4
LT		 2421static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2422{
2423 struct inet6_dev *idev;
2424
2425 ASSERT_RTNL();
2426
e21e8467
SH		 2427 idev = ipv6_find_idev(dev);
2428 if (!idev)
64e724f6
BH		 2429 return ERR_PTR(-ENOBUFS);
2430
2431 if (idev->cnf.disable_ipv6)
2432 return ERR_PTR(-EACCES);
1da177e4
LT		 2433
2434 /* Add default multicast route */
ba46ee4c 2435 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
4af04aba 2436 addrconf_add_mroute(dev);
1da177e4 2437
1da177e4
LT		 2438 return idev;
2439}
2440
53bd6749
JP		 2441static void manage_tempaddrs(struct inet6_dev *idev,
2442 struct inet6_ifaddr *ifp,
2443 __u32 valid_lft, __u32 prefered_lft,
2444 bool create, unsigned long now)
2445{
2446 u32 flags;
2447 struct inet6_ifaddr *ift;
2448
2449 read_lock_bh(&idev->lock);
2450 /* update all temporary addresses in the list */
2451 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2452 int age, max_valid, max_prefered;
2453
2454 if (ifp != ift->ifpub)
2455 continue;
2456
2457 /* RFC 4941 section 3.3:
2458 * If a received option will extend the lifetime of a public
2459 * address, the lifetimes of temporary addresses should
2460 * be extended, subject to the overall constraint that no
2461 * temporary addresses should ever remain "valid" or "preferred"
2462 * for a time longer than (TEMP_VALID_LIFETIME) or
2463 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2464 */
2465 age = (now - ift->cstamp) / HZ;
2466 max_valid = idev->cnf.temp_valid_lft - age;
2467 if (max_valid < 0)
2468 max_valid = 0;
2469
2470 max_prefered = idev->cnf.temp_prefered_lft -
76506a98 2471 idev->desync_factor - age;
53bd6749
JP		 2472 if (max_prefered < 0)
2473 max_prefered = 0;
2474
2475 if (valid_lft > max_valid)
2476 valid_lft = max_valid;
2477
2478 if (prefered_lft > max_prefered)
2479 prefered_lft = max_prefered;
2480
2481 spin_lock(&ift->lock);
2482 flags = ift->flags;
2483 ift->valid_lft = valid_lft;
2484 ift->prefered_lft = prefered_lft;
2485 ift->tstamp = now;
2486 if (prefered_lft > 0)
2487 ift->flags &= ~IFA_F_DEPRECATED;
2488
2489 spin_unlock(&ift->lock);
2490 if (!(flags&IFA_F_TENTATIVE))
2491 ipv6_ifa_notify(0, ift);
2492 }
2493
2494 if ((create || list_empty(&idev->tempaddr_list)) &&
2495 idev->cnf.use_tempaddr > 0) {
2496 /* When a new public address is created as described
2497 * in [ADDRCONF], also create a new temporary address.
2498 * Also create a temporary address if it's enabled but
2499 * no temporary address currently exists.
2500 */
2501 read_unlock_bh(&idev->lock);
fffcefe9 2502 ipv6_create_tempaddr(ifp, NULL, false);
53bd6749
JP		 2503 } else {
2504 read_unlock_bh(&idev->lock);
2505 }
2506}
2507
cc9da6cc
BM		 2508static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2509{
d35a00b8
FJ		 2510 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2511 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc
BM		 2512}
2513
cc84b3c6
AA		 2514int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2515 const struct prefix_info *pinfo,
2516 struct inet6_dev *in6_dev,
2517 const struct in6_addr *addr, int addr_type,
2518 u32 addr_flags, bool sllao, bool tokenized,
2519 __u32 valid_lft, u32 prefered_lft)
4f672235
AA		 2520{
2521 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2522 int create = 0, update_lft = 0;
2523
2524 if (!ifp && valid_lft) {
2525 int max_addresses = in6_dev->cnf.max_addresses;
e6464b8c
DA		 2526 struct ifa6_config cfg = {
2527 .pfx = addr,
2528 .plen = pinfo->prefix_len,
2529 .ifa_flags = addr_flags,
2530 .valid_lft = valid_lft,
2531 .preferred_lft = prefered_lft,
2532 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2533 };
4f672235
AA		 2534
2535#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 2536 if ((net->ipv6.devconf_all->optimistic_dad ||
2537 in6_dev->cnf.optimistic_dad) &&
4f672235 2538 !net->ipv6.devconf_all->forwarding && sllao)
e6464b8c 2539 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
4f672235
AA		 2540#endif
2541
2542 /* Do not allow to create too much of autoconfigured
2543 * addresses; this would be too easy way to crash kernel.
2544 */
2545 if (!max_addresses ||
2546 ipv6_count_addresses(in6_dev) < max_addresses)
e6464b8c 2547 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
4f672235
AA		 2548
2549 if (IS_ERR_OR_NULL(ifp))
2550 return -1;
2551
4f672235
AA		 2552 create = 1;
2553 spin_lock_bh(&ifp->lock);
2554 ifp->flags |= IFA_F_MANAGETEMPADDR;
2555 ifp->cstamp = jiffies;
2556 ifp->tokenized = tokenized;
2557 spin_unlock_bh(&ifp->lock);
2558 addrconf_dad_start(ifp);
2559 }
2560
2561 if (ifp) {
2562 u32 flags;
2563 unsigned long now;
2564 u32 stored_lft;
2565
2566 /* update lifetime (RFC2462 5.5.3 e) */
2567 spin_lock_bh(&ifp->lock);
2568 now = jiffies;
2569 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2570 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2571 else
2572 stored_lft = 0;
f85f94b8 2573 if (!create && stored_lft) {
4f672235
AA		 2574 const u32 minimum_lft = min_t(u32,
2575 stored_lft, MIN_VALID_LIFETIME);
2576 valid_lft = max(valid_lft, minimum_lft);
2577
2578 /* RFC4862 Section 5.5.3e:
2579 * "Note that the preferred lifetime of the
2580 * corresponding address is always reset to
2581 * the Preferred Lifetime in the received
2582 * Prefix Information option, regardless of
2583 * whether the valid lifetime is also reset or
2584 * ignored."
2585 *
2586 * So we should always update prefered_lft here.
2587 */
2588 update_lft = 1;
2589 }
2590
2591 if (update_lft) {
2592 ifp->valid_lft = valid_lft;
2593 ifp->prefered_lft = prefered_lft;
2594 ifp->tstamp = now;
2595 flags = ifp->flags;
2596 ifp->flags &= ~IFA_F_DEPRECATED;
2597 spin_unlock_bh(&ifp->lock);
2598
2599 if (!(flags&IFA_F_TENTATIVE))
2600 ipv6_ifa_notify(0, ifp);
2601 } else
2602 spin_unlock_bh(&ifp->lock);
2603
2604 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2605 create, now);
2606
2607 in6_ifa_put(ifp);
2608 addrconf_verify();
2609 }
2610
2611 return 0;
2612}
cc84b3c6 2613EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
4f672235 2614
e6bff995 2615void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2616{
2617 struct prefix_info *pinfo;
2618 __u32 valid_lft;
2619 __u32 prefered_lft;
4f672235 2620 int addr_type, err;
64236f3f 2621 u32 addr_flags = 0;
1da177e4 2622 struct inet6_dev *in6_dev;
56d417b1 2623 struct net *net = dev_net(dev);
1da177e4
LT		 2624
2625 pinfo = (struct prefix_info *) opt;
1ab1457c 2626
1da177e4 2627 if (len < sizeof(struct prefix_info)) {
e32ac250 2628 netdev_dbg(dev, "addrconf: prefix option too short\n");
1da177e4
LT		 2629 return;
2630 }
1ab1457c 2631
1da177e4
LT		 2632 /*
2633 * Validation checks ([ADDRCONF], page 19)
2634 */
2635
2636 addr_type = ipv6_addr_type(&pinfo->prefix);
2637
2638 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2639 return;
2640
2641 valid_lft = ntohl(pinfo->valid);
2642 prefered_lft = ntohl(pinfo->prefered);
2643
2644 if (prefered_lft > valid_lft) {
e87cc472 2645 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2646 return;
2647 }
2648
2649 in6_dev = in6_dev_get(dev);
2650
63159f29 2651 if (!in6_dev) {
e87cc472
JP		 2652 net_dbg_ratelimited("addrconf: device %s not configured\n",
2653 dev->name);
1da177e4
LT		 2654 return;
2655 }
2656
2657 /*
2658 * Two things going on here:
2659 * 1) Add routes for on-link prefixes
2660 * 2) Configure prefixes with the auto flag set
2661 */
2662
4bed72e4 2663 if (pinfo->onlink) {
8d1c802b 2664 struct fib6_info *rt;
4bed72e4
YH		 2665 unsigned long rt_expires;
2666
6f704992
YH		 2667 /* Avoid arithmetic overflow. Really, we could
2668 * save rt_expires in seconds, likely valid_lft,
2669 * but it would require division in fib gc, that it
2670 * not good.
2671 */
4bed72e4
YH		 2672 if (HZ > USER_HZ)
2673 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2674 else
2675 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2676
4bed72e4
YH		 2677 if (addrconf_finite_timeout(rt_expires))
2678 rt_expires *= HZ;
1da177e4 2679
14ef37b6
AH		 2680 rt = addrconf_get_prefix_route(&pinfo->prefix,
2681 pinfo->prefix_len,
2682 dev,
2683 RTF_ADDRCONF | RTF_PREFIX_RT,
2684 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2685
14ef37b6 2686 if (rt) {
6f704992
YH		 2687 /* Autoconf prefix route */
2688 if (valid_lft == 0) {
afb1d4b5 2689 ip6_del_rt(net, rt);
6f704992 2690 rt = NULL;
4bed72e4 2691 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2692 /* not infinity */
14895687 2693 fib6_set_expires(rt, jiffies + rt_expires);
6f704992 2694 } else {
14895687 2695 fib6_clean_expires(rt);
1da177e4
LT		 2696 }
2697 } else if (valid_lft) {
6f704992 2698 clock_t expires = 0;
4bed72e4
YH		 2699 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2700 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2701 /* not infinity */
2702 flags |= RTF_EXPIRES;
2703 expires = jiffies_to_clock_t(rt_expires);
2704 }
1da177e4 2705 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
8308f3ff
DA		 2706 0, dev, expires, flags,
2707 GFP_ATOMIC);
1da177e4 2708 }
93531c67 2709 fib6_info_release(rt);
1da177e4
LT		 2710 }
2711
2712 /* Try to figure out our local address for this prefix */
2713
2714 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1da177e4 2715 struct in6_addr addr;
f997c55c 2716 bool tokenized = false, dev_addr_generated = false;
1da177e4
LT		 2717
2718 if (pinfo->prefix_len == 64) {
2719 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2720
2721 if (!ipv6_addr_any(&in6_dev->token)) {
2722 read_lock_bh(&in6_dev->lock);
2723 memcpy(addr.s6_addr + 8,
2724 in6_dev->token.s6_addr + 8, 8);
2725 read_unlock_bh(&in6_dev->lock);
617fe29d 2726 tokenized = true;
cc9da6cc 2727 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2728 !ipv6_generate_stable_address(&addr, 0,
2729 in6_dev)) {
64236f3f 2730 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2731 goto ok;
f53adae4
DB		 2732 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2733 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
4f672235 2734 goto put;
f997c55c
AA		 2735 } else {
2736 dev_addr_generated = true;
1da177e4
LT		 2737 }
2738 goto ok;
2739 }
e87cc472
JP		 2740 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2741 pinfo->prefix_len);
4f672235 2742 goto put;
1da177e4
LT		 2743
2744ok:
4f672235
AA		 2745 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2746 &addr, addr_type,
2747 addr_flags, sllao,
2748 tokenized, valid_lft,
2749 prefered_lft);
2750 if (err)
2751 goto put;
f997c55c
AA		 2752
2753 /* Ignore error case here because previous prefix add addr was
2754 * successful which will be notified.
2755 */
2756 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2757 addr_type, addr_flags, sllao,
2758 tokenized, valid_lft,
2759 prefered_lft,
2760 dev_addr_generated);
1da177e4
LT		 2761 }
2762 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
4f672235 2763put:
1da177e4
LT		 2764 in6_dev_put(in6_dev);
2765}
2766
2767/*
2768 * Set destination address.
2769 * Special case for SIT interfaces where we create a new "virtual"
2770 * device.
2771 */
af284937 2772int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2773{
2774 struct in6_ifreq ireq;
2775 struct net_device *dev;
2776 int err = -EINVAL;
2777
2778 rtnl_lock();
2779
2780 err = -EFAULT;
2781 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2782 goto err_exit;
2783
af284937 2784 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2785
2786 err = -ENODEV;
63159f29 2787 if (!dev)
1da177e4
LT		 2788 goto err_exit;
2789
07a93626 2790#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2791 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2792 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2793 struct ifreq ifr;
1da177e4
LT		 2794 struct ip_tunnel_parm p;
2795
2796 err = -EADDRNOTAVAIL;
2797 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2798 goto err_exit;
2799
2800 memset(&p, 0, sizeof(p));
2801 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2802 p.iph.saddr = 0;
2803 p.iph.version = 4;
2804 p.iph.ihl = 5;
2805 p.iph.protocol = IPPROTO_IPV6;
2806 p.iph.ttl = 64;
d20b3109 2807 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2808
5bc3eb7e
SH		 2809 if (ops->ndo_do_ioctl) {
2810 mm_segment_t oldfs = get_fs();
2811
2812 set_fs(KERNEL_DS);
2813 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2814 set_fs(oldfs);
2815 } else
2816 err = -EOPNOTSUPP;
1da177e4
LT		 2817
2818 if (err == 0) {
2819 err = -ENOBUFS;
af284937
DL		 2820 dev = __dev_get_by_name(net, p.name);
2821 if (!dev)
1da177e4
LT		 2822 goto err_exit;
2823 err = dev_open(dev);
2824 }
2825 }
0be669bb 2826#endif
1da177e4
LT		 2827
2828err_exit:
2829 rtnl_unlock();
2830 return err;
2831}
2832
93a714d6
MC		 2833static int ipv6_mc_config(struct sock *sk, bool join,
2834 const struct in6_addr *addr, int ifindex)
2835{
2836 int ret;
2837
2838 ASSERT_RTNL();
2839
2840 lock_sock(sk);
2841 if (join)
54ff9ef3 2842 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2843 else
54ff9ef3 2844 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2845 release_sock(sk);
2846
2847 return ret;
2848}
2849
1da177e4
LT		 2850/*
2851 * Manual configuration of address on an interface
2852 */
479840ff 2853static int inet6_addr_add(struct net *net, int ifindex,
19b1518c 2854 struct ifa6_config *cfg,
de95e047 2855 struct netlink_ext_ack *extack)
1da177e4
LT		 2856{
2857 struct inet6_ifaddr *ifp;
2858 struct inet6_dev *idev;
2859 struct net_device *dev;
93a714d6
MC		 2860 unsigned long timeout;
2861 clock_t expires;
6f704992 2862 u32 flags;
1da177e4
LT		 2863
2864 ASSERT_RTNL();
1ab1457c 2865
19b1518c 2866 if (cfg->plen > 128)
24ef0da7
TG		 2867 return -EINVAL;
2868
0778769d 2869 /* check the lifetime */
19b1518c 2870 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
0778769d
NT		 2871 return -EINVAL;
2872
19b1518c 2873 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
53bd6749
JP		 2874 return -EINVAL;
2875
af284937
DL		 2876 dev = __dev_get_by_index(net, ifindex);
2877 if (!dev)
1da177e4 2878 return -ENODEV;
1ab1457c 2879
64e724f6
BH		 2880 idev = addrconf_add_dev(dev);
2881 if (IS_ERR(idev))
2882 return PTR_ERR(idev);
1da177e4 2883
19b1518c 2884 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
93a714d6 2885 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
19b1518c 2886 true, cfg->pfx, ifindex);
93a714d6
MC		 2887
2888 if (ret < 0)
2889 return ret;
2890 }
2891
19b1518c 2892 cfg->scope = ipv6_addr_scope(cfg->pfx);
1da177e4 2893
19b1518c 2894 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4bed72e4
YH		 2895 if (addrconf_finite_timeout(timeout)) {
2896 expires = jiffies_to_clock_t(timeout * HZ);
19b1518c 2897 cfg->valid_lft = timeout;
6f704992 2898 flags = RTF_EXPIRES;
4bed72e4
YH		 2899 } else {
2900 expires = 0;
2901 flags = 0;
19b1518c 2902 cfg->ifa_flags |= IFA_F_PERMANENT;
6f704992 2903 }
0778769d 2904
19b1518c 2905 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4bed72e4
YH		 2906 if (addrconf_finite_timeout(timeout)) {
2907 if (timeout == 0)
19b1518c
DA		 2908 cfg->ifa_flags |= IFA_F_DEPRECATED;
2909 cfg->preferred_lft = timeout;
4bed72e4 2910 }
0778769d 2911
19b1518c 2912 ifp = ipv6_add_addr(idev, cfg, true, extack);
1da177e4 2913 if (!IS_ERR(ifp)) {
19b1518c 2914 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
8308f3ff
DA		 2915 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2916 ifp->rt_priority, dev, expires,
2917 flags, GFP_KERNEL);
761aac73
TH		 2918 }
2919
a2d481b3
LB		 2920 /* Send a netlink notification if DAD is enabled and
2921 * optimistic flag is not set
2922 */
2923 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2924 ipv6_ifa_notify(0, ifp);
95c385b4
NH		 2925 /*
2926 * Note that section 3.1 of RFC 4429 indicates
2927 * that the Optimistic flag should not be set for
2928 * manually configured addresses
2929 */
cf22f9a2 2930 addrconf_dad_start(ifp);
19b1518c
DA		 2931 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2932 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2933 cfg->preferred_lft, true, jiffies);
1da177e4 2934 in6_ifa_put(ifp);
c15b1cca 2935 addrconf_verify_rtnl();
1da177e4 2936 return 0;
19b1518c
DA		 2937 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2938 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
2939 cfg->pfx, ifindex);
1da177e4
LT		 2940 }
2941
2942 return PTR_ERR(ifp);
2943}
2944
6046d5b4
HK		 2945static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2946 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2947{
2948 struct inet6_ifaddr *ifp;
2949 struct inet6_dev *idev;
2950 struct net_device *dev;
1ab1457c 2951
24ef0da7
TG		 2952 if (plen > 128)
2953 return -EINVAL;
2954
af284937
DL		 2955 dev = __dev_get_by_index(net, ifindex);
2956 if (!dev)
1da177e4
LT		 2957 return -ENODEV;
2958
e5d08d71 2959 idev = __in6_dev_get(dev);
63159f29 2960 if (!idev)
1da177e4
LT		 2961 return -ENXIO;
2962
2963 read_lock_bh(&idev->lock);
502a2ffd 2964 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2965 if (ifp->prefix_len == plen &&
2966 ipv6_addr_equal(pfx, &ifp->addr)) {
2967 in6_ifa_hold(ifp);
2968 read_unlock_bh(&idev->lock);
1ab1457c 2969
6046d5b4
HK		 2970 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2971 (ifa_flags & IFA_F_MANAGETEMPADDR))
2972 manage_tempaddrs(idev, ifp, 0, 0, false,
2973 jiffies);
1da177e4 2974 ipv6_del_addr(ifp);
6046d5b4 2975 addrconf_verify_rtnl();
93a714d6
MC		 2976 if (ipv6_addr_is_multicast(pfx)) {
2977 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2978 false, pfx, dev->ifindex);
2979 }
1da177e4
LT		 2980 return 0;
2981 }
2982 }
2983 read_unlock_bh(&idev->lock);
2984 return -EADDRNOTAVAIL;
2985}
2986
2987
af284937 2988int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4 2989{
19b1518c
DA		 2990 struct ifa6_config cfg = {
2991 .ifa_flags = IFA_F_PERMANENT,
2992 .preferred_lft = INFINITY_LIFE_TIME,
2993 .valid_lft = INFINITY_LIFE_TIME,
2994 };
1da177e4
LT		 2995 struct in6_ifreq ireq;
2996 int err;
1ab1457c 2997
af31f412 2998 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2999 return -EPERM;
1ab1457c 3000
1da177e4
LT		 3001 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3002 return -EFAULT;
3003
19b1518c
DA		 3004 cfg.pfx = &ireq.ifr6_addr;
3005 cfg.plen = ireq.ifr6_prefixlen;
3006
1da177e4 3007 rtnl_lock();
19b1518c 3008 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
1da177e4
LT		 3009 rtnl_unlock();
3010 return err;
3011}
3012
af284937 3013int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 3014{
3015 struct in6_ifreq ireq;
3016 int err;
1ab1457c 3017
af31f412 3018 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 3019 return -EPERM;
3020
3021 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3022 return -EFAULT;
3023
3024 rtnl_lock();
6046d5b4 3025 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 3026 ireq.ifr6_prefixlen);
1da177e4
LT		 3027 rtnl_unlock();
3028 return err;
3029}
3030
b5f348e5
IJ		 3031static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3032 int plen, int scope)
3033{
3034 struct inet6_ifaddr *ifp;
e6464b8c
DA		 3035 struct ifa6_config cfg = {
3036 .pfx = addr,
3037 .plen = plen,
3038 .ifa_flags = IFA_F_PERMANENT,
3039 .valid_lft = INFINITY_LIFE_TIME,
3040 .preferred_lft = INFINITY_LIFE_TIME,
3041 .scope = scope
3042 };
b5f348e5 3043
e6464b8c 3044 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
b5f348e5
IJ		 3045 if (!IS_ERR(ifp)) {
3046 spin_lock_bh(&ifp->lock);
3047 ifp->flags &= ~IFA_F_TENTATIVE;
3048 spin_unlock_bh(&ifp->lock);
764d3be6 3049 rt_genid_bump_ipv6(dev_net(idev->dev));
b5f348e5
IJ		 3050 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3051 in6_ifa_put(ifp);
3052 }
3053}
3054
07a93626 3055#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3056static void sit_add_v4_addrs(struct inet6_dev *idev)
3057{
1da177e4
LT		 3058 struct in6_addr addr;
3059 struct net_device *dev;
c346dca1 3060 struct net *net = dev_net(idev->dev);
929c9cf3 3061 int scope, plen;
f0e2acfa 3062 u32 pflags = 0;
1da177e4
LT		 3063
3064 ASSERT_RTNL();
3065
3066 memset(&addr, 0, sizeof(struct in6_addr));
3067 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3068
3069 if (idev->dev->flags&IFF_POINTOPOINT) {
3070 addr.s6_addr32[0] = htonl(0xfe800000);
3071 scope = IFA_LINK;
929c9cf3 3072 plen = 64;
1da177e4
LT		 3073 } else {
3074 scope = IPV6_ADDR_COMPATv4;
929c9cf3 3075 plen = 96;
f0e2acfa 3076 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 3077 }
3078
3079 if (addr.s6_addr32[3]) {
929c9cf3 3080 add_addr(idev, &addr, plen, scope);
8308f3ff 3081 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
e500c6d3 3082 GFP_KERNEL);
1da177e4
LT		 3083 return;
3084 }
3085
6fda7350 3086 for_each_netdev(net, dev) {
8e5e8f30 3087 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 3088 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 3089 struct in_ifaddr *ifa;
1da177e4
LT		 3090
3091 int flag = scope;
3092
3093 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 3094
3095 addr.s6_addr32[3] = ifa->ifa_local;
3096
3097 if (ifa->ifa_scope == RT_SCOPE_LINK)
3098 continue;
3099 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3100 if (idev->dev->flags&IFF_POINTOPOINT)
3101 continue;
3102 flag |= IFA_HOST;
3103 }
1da177e4 3104
b5f348e5 3105 add_addr(idev, &addr, plen, flag);
8308f3ff 3106 addrconf_prefix_route(&addr, plen, 0, idev->dev,
e500c6d3 3107 0, pflags, GFP_KERNEL);
1da177e4
LT		 3108 }
3109 }
1ab1457c 3110 }
1da177e4 3111}
0be669bb 3112#endif
1da177e4
LT		 3113
3114static void init_loopback(struct net_device *dev)
3115{
3116 struct inet6_dev *idev;
1da177e4
LT		 3117
3118 /* ::1 */
3119
3120 ASSERT_RTNL();
3121
e5d08d71 3122 idev = ipv6_find_idev(dev);
63159f29 3123 if (!idev) {
91df42be 3124 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3125 return;
3126 }
3127
b5f348e5 3128 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 3129}
3130
2ad3ed59
AA		 3131void addrconf_add_linklocal(struct inet6_dev *idev,
3132 const struct in6_addr *addr, u32 flags)
1da177e4 3133{
e6464b8c
DA		 3134 struct ifa6_config cfg = {
3135 .pfx = addr,
3136 .plen = 64,
3137 .ifa_flags = flags | IFA_F_PERMANENT,
3138 .valid_lft = INFINITY_LIFE_TIME,
3139 .preferred_lft = INFINITY_LIFE_TIME,
3140 .scope = IFA_LINK
3141 };
8e5e8f30 3142 struct inet6_ifaddr *ifp;
95c385b4
NH		 3143
3144#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 3145 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3146 idev->cnf.optimistic_dad) &&
702beb87 3147 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
e6464b8c 3148 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
95c385b4 3149#endif
1da177e4 3150
e6464b8c 3151 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
1da177e4 3152 if (!IS_ERR(ifp)) {
8308f3ff 3153 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
acb54e3c 3154 0, 0, GFP_ATOMIC);
cf22f9a2 3155 addrconf_dad_start(ifp);
1da177e4
LT		 3156 in6_ifa_put(ifp);
3157 }
3158}
2ad3ed59 3159EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
1da177e4 3160
622c81d5
HFS		 3161static bool ipv6_reserved_interfaceid(struct in6_addr address)
3162{
3163 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3164 return true;
3165
3166 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3167 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3168 return true;
3169
3170 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3171 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3172 return true;
3173
3174 return false;
3175}
3176
3177static int ipv6_generate_stable_address(struct in6_addr *address,
3178 u8 dad_count,
3179 const struct inet6_dev *idev)
3180{
622c81d5
HFS		 3181 static DEFINE_SPINLOCK(lock);
3182 static __u32 digest[SHA_DIGEST_WORDS];
3183 static __u32 workspace[SHA_WORKSPACE_WORDS];
3184
3185 static union {
3186 char __data[SHA_MESSAGE_BYTES];
3187 struct {
3188 struct in6_addr secret;
ff40217e 3189 __be32 prefix[2];
622c81d5
HFS		 3190 unsigned char hwaddr[MAX_ADDR_LEN];
3191 u8 dad_count;
3192 } __packed;
3193 } data;
3194
3195 struct in6_addr secret;
3196 struct in6_addr temp;
3197 struct net *net = dev_net(idev->dev);
3198
3199 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3200
3201 if (idev->cnf.stable_secret.initialized)
3202 secret = idev->cnf.stable_secret.secret;
3203 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3204 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3205 else
3206 return -1;
3207
3208retry:
3209 spin_lock_bh(&lock);
3210
3211 sha_init(digest);
3212 memset(&data, 0, sizeof(data));
3213 memset(workspace, 0, sizeof(workspace));
3214 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3215 data.prefix[0] = address->s6_addr32[0];
3216 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3217 data.secret = secret;
3218 data.dad_count = dad_count;
3219
3220 sha_transform(digest, data.__data, workspace);
3221
3222 temp = *address;
ff40217e
HFS		 3223 temp.s6_addr32[2] = (__force __be32)digest[0];
3224 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3225
3226 spin_unlock_bh(&lock);
3227
3228 if (ipv6_reserved_interfaceid(temp)) {
3229 dad_count++;
1855b7c3 3230 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3231 return -1;
3232 goto retry;
3233 }
3234
3235 *address = temp;
3236 return 0;
3237}
3238
cc9da6cc
BM		 3239static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3240{
3241 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3242
3243 if (s->initialized)
3244 return;
3245 s = &idev->cnf.stable_secret;
3246 get_random_bytes(&s->secret, sizeof(s->secret));
3247 s->initialized = true;
3248}
3249
bc91b0f0
JP		 3250static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3251{
622c81d5
HFS		 3252 struct in6_addr addr;
3253
ca254490
DA		 3254 /* no link local addresses on L3 master devices */
3255 if (netif_is_l3_master(idev->dev))
3256 return;
3257
622c81d5 3258 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3259
d35a00b8 3260 switch (idev->cnf.addr_gen_mode) {
cc9da6cc
BM		 3261 case IN6_ADDR_GEN_MODE_RANDOM:
3262 ipv6_gen_mode_random_init(idev);
3263 /* fallthrough */
3264 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3265 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3266 addrconf_add_linklocal(idev, &addr,
3267 IFA_F_STABLE_PRIVACY);
622c81d5 3268 else if (prefix_route)
8308f3ff 3269 addrconf_prefix_route(&addr, 64, 0, idev->dev,
acb54e3c 3270 0, 0, GFP_KERNEL);
cc9da6cc
BM		 3271 break;
3272 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3273 /* addrconf_add_linklocal also adds a prefix_route and we
3274 * only need to care about prefix routes if ipv6_generate_eui64
3275 * couldn't generate one.
3276 */
3277 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3278 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0 3279 else if (prefix_route)
8308f3ff 3280 addrconf_prefix_route(&addr, 64, 0, idev->dev,
27b10608 3281 0, 0, GFP_KERNEL);
cc9da6cc
BM		 3282 break;
3283 case IN6_ADDR_GEN_MODE_NONE:
3284 default:
3285 /* will not add any link local address */
3286 break;
bc91b0f0
JP		 3287 }
3288}
3289
1da177e4
LT		 3290static void addrconf_dev_config(struct net_device *dev)
3291{
8e5e8f30 3292 struct inet6_dev *idev;
1da177e4
LT		 3293
3294 ASSERT_RTNL();
3295
74235a25
HX		 3296 if ((dev->type != ARPHRD_ETHER) &&
3297 (dev->type != ARPHRD_FDDI) &&
74235a25 3298 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3299 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3300 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3301 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc 3302 (dev->type != ARPHRD_6LOWPAN) &&
45ce0fd1
FJ		 3303 (dev->type != ARPHRD_IP6GRE) &&
3304 (dev->type != ARPHRD_IPGRE) &&
3305 (dev->type != ARPHRD_TUNNEL) &&
9deb441c
SAK		 3306 (dev->type != ARPHRD_NONE) &&
3307 (dev->type != ARPHRD_RAWIP)) {
74235a25
HX		 3308 /* Alas, we support only Ethernet autoconfiguration. */
3309 return;
3310 }
3311
1da177e4 3312 idev = addrconf_add_dev(dev);
64e724f6 3313 if (IS_ERR(idev))
1da177e4
LT		 3314 return;
3315
cc9da6cc
BM		 3316 /* this device type has no EUI support */
3317 if (dev->type == ARPHRD_NONE &&
d35a00b8
FJ		 3318 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3319 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc 3320
bc91b0f0 3321 addrconf_addr_gen(idev, false);
1da177e4
LT		 3322}
3323
07a93626 3324#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3325static void addrconf_sit_config(struct net_device *dev)
3326{
3327 struct inet6_dev *idev;
3328
3329 ASSERT_RTNL();
3330
1ab1457c
YH		 3331 /*
3332 * Configure the tunnel with one of our IPv4
3333 * addresses... we should configure all of
1da177e4
LT		 3334 * our v4 addrs in the tunnel
3335 */
3336
e5d08d71 3337 idev = ipv6_find_idev(dev);
63159f29 3338 if (!idev) {
91df42be 3339 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3340 return;
3341 }
3342
c7dc89c0 3343 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3344 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3345 return;
3346 }
3347
1da177e4
LT		 3348 sit_add_v4_addrs(idev);
3349
62b54dd9 3350 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3351 addrconf_add_mroute(dev);
1da177e4 3352}
0be669bb 3353#endif
1da177e4 3354
07a93626 3355#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3356static void addrconf_gre_config(struct net_device *dev)
3357{
3358 struct inet6_dev *idev;
aee80b54 3359
aee80b54 3360 ASSERT_RTNL();
3361
e5d08d71 3362 idev = ipv6_find_idev(dev);
63159f29 3363 if (!idev) {
91df42be 3364 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3365 return;
3366 }
3367
bc91b0f0 3368 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3369 if (dev->flags & IFF_POINTOPOINT)
3370 addrconf_add_mroute(dev);
aee80b54 3371}
3372#endif
3373
afb1d4b5
DA		 3374static int fixup_permanent_addr(struct net *net,
3375 struct inet6_dev *idev,
f1705ec1
DA		 3376 struct inet6_ifaddr *ifp)
3377{
93c2fb25 3378 /* !fib6_node means the host route was removed from the
8048ced9
DA		 3379 * FIB, for example, if 'lo' device is taken down. In that
3380 * case regenerate the host route.
3381 */
93c2fb25 3382 if (!ifp->rt || !ifp->rt->fib6_node) {
360a9887 3383 struct fib6_info *f6i, *prev;
f1705ec1 3384
360a9887
DA		 3385 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3386 GFP_ATOMIC);
3387 if (IS_ERR(f6i))
3388 return PTR_ERR(f6i);
f1705ec1 3389
8048ced9
DA		 3390 /* ifp->rt can be accessed outside of rtnl */
3391 spin_lock(&ifp->lock);
3392 prev = ifp->rt;
360a9887 3393 ifp->rt = f6i;
8048ced9
DA		 3394 spin_unlock(&ifp->lock);
3395
93531c67 3396 fib6_info_release(prev);
f1705ec1
DA		 3397 }
3398
3399 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3400 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
8308f3ff
DA		 3401 ifp->rt_priority, idev->dev, 0, 0,
3402 GFP_ATOMIC);
f1705ec1
DA		 3403 }
3404
6d717134
DA		 3405 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3406 addrconf_dad_start(ifp);
f1705ec1
DA		 3407
3408 return 0;
3409}
3410
afb1d4b5 3411static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
f1705ec1
DA		 3412{
3413 struct inet6_ifaddr *ifp, *tmp;
3414 struct inet6_dev *idev;
3415
3416 idev = __in6_dev_get(dev);
3417 if (!idev)
3418 return;
3419
3420 write_lock_bh(&idev->lock);
3421
3422 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3423 if ((ifp->flags & IFA_F_PERMANENT) &&
afb1d4b5 3424 fixup_permanent_addr(net, idev, ifp) < 0) {
f1705ec1 3425 write_unlock_bh(&idev->lock);
e669b869 3426 in6_ifa_hold(ifp);
f1705ec1
DA		 3427 ipv6_del_addr(ifp);
3428 write_lock_bh(&idev->lock);
3429
3430 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3431 idev->dev->name, &ifp->addr);
3432 }
3433 }
3434
3435 write_unlock_bh(&idev->lock);
3436}
3437
1ab1457c 3438static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3439 void *ptr)
1da177e4 3440{
351638e7 3441 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
896585d4 3442 struct netdev_notifier_change_info *change_info;
4f7f34ea 3443 struct netdev_notifier_changeupper_info *info;
748e2d93 3444 struct inet6_dev *idev = __in6_dev_get(dev);
60abc0be 3445 struct net *net = dev_net(dev);
c5e33bdd 3446 int run_pending = 0;
b217d616 3447 int err;
1da177e4 3448
e21e8467 3449 switch (event) {
45ba9dd2 3450 case NETDEV_REGISTER:
74235a25 3451 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3452 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3453 if (IS_ERR(idev))
3454 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3455 }
3456 break;
bcdd553f 3457
b7b0b1d2
AD		 3458 case NETDEV_CHANGEMTU:
3459 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3460 if (dev->mtu < IPV6_MIN_MTU) {
60abc0be 3461 addrconf_ifdown(dev, dev != net->loopback_dev);
b7b0b1d2
AD		 3462 break;
3463 }
3464
3465 if (idev) {
3466 rt6_mtu_change(dev, dev->mtu);
3467 idev->cnf.mtu6 = dev->mtu;
3468 break;
3469 }
3470
3471 /* allocate new idev */
3472 idev = ipv6_add_dev(dev);
3473 if (IS_ERR(idev))
3474 break;
3475
3476 /* device is still not ready */
3477 if (!(idev->if_flags & IF_READY))
3478 break;
3479
3480 run_pending = 1;
3481
3482 /* fall through */
3483
1da177e4 3484 case NETDEV_UP:
3c21edbd 3485 case NETDEV_CHANGE:
c2edacf8
JV		 3486 if (dev->flags & IFF_SLAVE)
3487 break;
3488
3ce62a84
WC		 3489 if (idev && idev->cnf.disable_ipv6)
3490 break;
3491
3c21edbd 3492 if (event == NETDEV_UP) {
38bd10c4 3493 /* restore routes for permanent addresses */
afb1d4b5 3494 addrconf_permanent_addr(net, dev);
38bd10c4 3495
1f372c7b 3496 if (!addrconf_link_ready(dev)) {
3c21edbd 3497 /* device is not ready yet. */
f3213831 3498 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3499 dev->name);
3500 break;
3501 }
99081049 3502
d31c7b8f
EP		 3503 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3504 idev = ipv6_add_dev(dev);
3505
a317a2f1 3506 if (!IS_ERR_OR_NULL(idev)) {
99081049 3507 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3508 run_pending = 1;
3509 }
b7b0b1d2 3510 } else if (event == NETDEV_CHANGE) {
1f372c7b 3511 if (!addrconf_link_ready(dev)) {
3c21edbd 3512 /* device is still not ready. */
27c6fa73 3513 rt6_sync_down_dev(dev, event);
3c21edbd
YH		 3514 break;
3515 }
3516
896585d4 3517 if (!IS_ERR_OR_NULL(idev)) {
a088d1d7
LL		 3518 if (idev->if_flags & IF_READY) {
3519 /* device is already configured -
3520 * but resend MLD reports, we might
3521 * have roamed and need to update
3522 * multicast snooping switches
3523 */
3524 ipv6_mc_up(idev);
896585d4
HL		 3525 change_info = ptr;
3526 if (change_info->flags_changed & IFF_NOARP)
3527 addrconf_dad_run(idev, true);
27c6fa73 3528 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3c21edbd 3529 break;
a088d1d7 3530 }
3c21edbd
YH		 3531 idev->if_flags |= IF_READY;
3532 }
3533
f3213831
JP		 3534 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3535 dev->name);
3c21edbd 3536
c5e33bdd 3537 run_pending = 1;
3c21edbd
YH		 3538 }
3539
e21e8467 3540 switch (dev->type) {
07a93626 3541#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3542 case ARPHRD_SIT:
3543 addrconf_sit_config(dev);
3544 break;
aee80b54 3545#endif
07a93626 3546#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3547 case ARPHRD_IPGRE:
3548 addrconf_gre_config(dev);
3549 break;
0be669bb 3550#endif
1da177e4
LT		 3551 case ARPHRD_LOOPBACK:
3552 init_loopback(dev);
3553 break;
3554
3555 default:
3556 addrconf_dev_config(dev);
3557 break;
3ff50b79 3558 }
bcdd553f 3559
a317a2f1 3560 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd 3561 if (run_pending)
896585d4 3562 addrconf_dad_run(idev, false);
c5e33bdd 3563
2127d95a
IS		 3564 /* Device has an address by now */
3565 rt6_sync_up(dev, RTNH_F_DEAD);
3566
bcdd553f
SH		 3567 /*
3568 * If the MTU changed during the interface down,
3569 * when the interface up, the changed MTU must be
3570 * reflected in the idev as well as routers.
1da177e4 3571 */
bcdd553f
SH		 3572 if (idev->cnf.mtu6 != dev->mtu &&
3573 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3574 rt6_mtu_change(dev, dev->mtu);
3575 idev->cnf.mtu6 = dev->mtu;
3576 }
3577 idev->tstamp = jiffies;
3578 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3579
3580 /*
3581 * If the changed mtu during down is lower than
3582 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3583 */
3584 if (dev->mtu < IPV6_MIN_MTU)
60abc0be 3585 addrconf_ifdown(dev, dev != net->loopback_dev);
1da177e4
LT		 3586 }
3587 break;
3588
1da177e4
LT		 3589 case NETDEV_DOWN:
3590 case NETDEV_UNREGISTER:
3591 /*
3592 * Remove all addresses from this interface.
3593 */
3594 addrconf_ifdown(dev, event != NETDEV_DOWN);
3595 break;
3c21edbd 3596
1da177e4 3597 case NETDEV_CHANGENAME:
1da177e4 3598 if (idev) {
5632c515 3599 snmp6_unregister_dev(idev);
408c4768 3600 addrconf_sysctl_unregister(idev);
a317a2f1 3601 err = addrconf_sysctl_register(idev);
b217d616
HX		 3602 if (err)
3603 return notifier_from_errno(err);
a317a2f1
WC		 3604 err = snmp6_register_dev(idev);
3605 if (err) {
3606 addrconf_sysctl_unregister(idev);
3607 return notifier_from_errno(err);
3608 }
5632c515 3609 }
1da177e4 3610 break;
bcdd553f 3611
93d9b7d7
JP		 3612 case NETDEV_PRE_TYPE_CHANGE:
3613 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3614 if (idev)
3615 addrconf_type_change(dev, event);
75c78500 3616 break;
4f7f34ea
DA		 3617
3618 case NETDEV_CHANGEUPPER:
3619 info = ptr;
3620
3621 /* flush all routes if dev is linked to or unlinked from
3622 * an L3 master device (e.g., VRF)
3623 */
3624 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3625 addrconf_ifdown(dev, 0);
3ff50b79 3626 }
1da177e4
LT		 3627
3628 return NOTIFY_OK;
3629}
3630
3631/*
3632 * addrconf module should be notified of a device going up
3633 */
3634static struct notifier_block ipv6_dev_notf = {
3635 .notifier_call = addrconf_notify,
242d3a49 3636 .priority = ADDRCONF_NOTIFY_PRIORITY,
1da177e4
LT		 3637};
3638
93d9b7d7 3639static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3640{
3641 struct inet6_dev *idev;
3642 ASSERT_RTNL();
3643
3644 idev = __in6_dev_get(dev);
3645
93d9b7d7 3646 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3647 ipv6_mc_remap(idev);
93d9b7d7 3648 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3649 ipv6_mc_unmap(idev);
3650}
3651
70af921d
DA		 3652static bool addr_is_local(const struct in6_addr *addr)
3653{
3654 return ipv6_addr_type(addr) &
3655 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3656}
3657
1da177e4
LT		 3658static int addrconf_ifdown(struct net_device *dev, int how)
3659{
4c981e28 3660 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN;
c346dca1 3661 struct net *net = dev_net(dev);
502a2ffd 3662 struct inet6_dev *idev;
f1705ec1 3663 struct inet6_ifaddr *ifa, *tmp;
0aef78aa 3664 bool keep_addr = false;
73a8bd74 3665 int state, i;
1da177e4
LT		 3666
3667 ASSERT_RTNL();
3668
4c981e28 3669 rt6_disable_ip(dev, event);
1da177e4
LT		 3670
3671 idev = __in6_dev_get(dev);
63159f29 3672 if (!idev)
1da177e4
LT		 3673 return -ENODEV;
3674
bcdd553f
SH		 3675 /*
3676 * Step 1: remove reference to ipv6 device from parent device.
3677 * Do not dev_put!
1da177e4 3678 */
439e2385 3679 if (how) {
1da177e4 3680 idev->dead = 1;
8814c4b5
YH		 3681
3682 /* protected by rtnl_lock */
a9b3cd7f 3683 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3684
3685 /* Step 1.5: remove snmp6 entry */
3686 snmp6_unregister_dev(idev);
3687
3688 }
3689
f1705ec1
DA		 3690 /* combine the user config with event to determine if permanent
3691 * addresses are to be removed from address hash table
3692 */
0aef78aa
IV		 3693 if (!how && !idev->cnf.disable_ipv6) {
3694 /* aggregate the system setting and interface setting */
3695 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3696
3697 if (!_keep_addr)
3698 _keep_addr = idev->cnf.keep_addr_on_down;
3699
3700 keep_addr = (_keep_addr > 0);
3701 }
f1705ec1 3702
73a8bd74
DM		 3703 /* Step 2: clear hash table */
3704 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3705 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3706
3707 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3708restart:
b67bfe0d 3709 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3710 if (ifa->idev == idev) {
c15b1cca 3711 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3712 /* combined flag + permanent flag decide if
3713 * address is retained on a down event
3714 */
3715 if (!keep_addr ||
70af921d
DA		 3716 !(ifa->flags & IFA_F_PERMANENT) ||
3717 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3718 hlist_del_init_rcu(&ifa->addr_lst);
3719 goto restart;
3720 }
73a8bd74
DM		 3721 }
3722 }
3723 spin_unlock_bh(&addrconf_hash_lock);
3724 }
3725
1da177e4
LT		 3726 write_lock_bh(&idev->lock);
3727
b7b1bfce
HFS		 3728 addrconf_del_rs_timer(idev);
3729
bcdd553f 3730 /* Step 2: clear flags for stateless addrconf */
439e2385 3731 if (!how)
3c21edbd 3732 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3733
bcdd553f 3734 /* Step 3: clear tempaddr list */
372e6c8f 3735 while (!list_empty(&idev->tempaddr_list)) {
3736 ifa = list_first_entry(&idev->tempaddr_list,
3737 struct inet6_ifaddr, tmp_list);
3738 list_del(&ifa->tmp_list);
1da177e4
LT		 3739 write_unlock_bh(&idev->lock);
3740 spin_lock_bh(&ifa->lock);
3741
3742 if (ifa->ifpub) {
3743 in6_ifa_put(ifa->ifpub);
3744 ifa->ifpub = NULL;
3745 }
3746 spin_unlock_bh(&ifa->lock);
3747 in6_ifa_put(ifa);
3748 write_lock_bh(&idev->lock);
3749 }
8f37ada5 3750
f1705ec1 3751 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
8d1c802b 3752 struct fib6_info *rt = NULL;
a2d6cbb0 3753 bool keep;
38bd10c4 3754
f1705ec1 3755 addrconf_del_dad_work(ifa);
84e8b803 3756
a2d6cbb0
RV		 3757 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3758 !addr_is_local(&ifa->addr);
a2d6cbb0 3759
73a8bd74 3760 write_unlock_bh(&idev->lock);
8e8e676d 3761 spin_lock_bh(&ifa->lock);
f1705ec1 3762
a2d6cbb0 3763 if (keep) {
f1705ec1
DA		 3764 /* set state to skip the notifier below */
3765 state = INET6_IFADDR_STATE_DEAD;
6d717134 3766 ifa->state = INET6_IFADDR_STATE_PREDAD;
f1705ec1
DA		 3767 if (!(ifa->flags & IFA_F_NODAD))
3768 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3769
3770 rt = ifa->rt;
3771 ifa->rt = NULL;
f1705ec1
DA		 3772 } else {
3773 state = ifa->state;
3774 ifa->state = INET6_IFADDR_STATE_DEAD;
f1705ec1
DA		 3775 }
3776
8e8e676d 3777 spin_unlock_bh(&ifa->lock);
9d82ca98 3778
38bd10c4 3779 if (rt)
afb1d4b5 3780 ip6_del_rt(net, rt);
38bd10c4 3781
73a8bd74
DM		 3782 if (state != INET6_IFADDR_STATE_DEAD) {
3783 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3784 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
ea06f717
MM		 3785 } else {
3786 if (idev->cnf.forwarding)
3787 addrconf_leave_anycast(ifa);
3788 addrconf_leave_solict(ifa->idev, &ifa->addr);
27bdb2ab 3789 }
8f37ada5 3790
73a8bd74 3791 write_lock_bh(&idev->lock);
8ef802aa
ED		 3792 if (!keep) {
3793 list_del_rcu(&ifa->if_list);
3794 in6_ifa_put(ifa);
3795 }
73a8bd74 3796 }
8f37ada5 3797
1da177e4
LT		 3798 write_unlock_bh(&idev->lock);
3799
381f4dca
SD		 3800 /* Step 5: Discard anycast and multicast list */
3801 if (how) {
3802 ipv6_ac_destroy_dev(idev);
1da177e4 3803 ipv6_mc_destroy_dev(idev);
381f4dca 3804 } else {
1da177e4 3805 ipv6_mc_down(idev);
381f4dca 3806 }
1da177e4 3807
1da177e4 3808 idev->tstamp = jiffies;
1ab1457c 3809
bcdd553f 3810 /* Last: Shot the device (if unregistered) */
439e2385 3811 if (how) {
408c4768 3812 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3813 neigh_parms_release(&nd_tbl, idev->nd_parms);
3814 neigh_ifdown(&nd_tbl, dev);
3815 in6_dev_put(idev);
3816 }
3817 return 0;
3818}
3819
e99e88a9 3820static void addrconf_rs_timer(struct timer_list *t)
1da177e4 3821{
e99e88a9 3822 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
caf92bc4 3823 struct net_device *dev = idev->dev;
b7b1bfce 3824 struct in6_addr lladdr;
1da177e4 3825
b7b1bfce 3826 write_lock(&idev->lock);
5b2a1953 3827 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3828 goto out;
3829
9ba2add3 3830 if (!ipv6_accept_ra(idev))
5b2a1953 3831 goto out;
3832
3833 /* Announcement received after solicitation was sent */
3834 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3835 goto out;
1da177e4 3836
bd11f074 3837 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
caf92bc4
CW		 3838 write_unlock(&idev->lock);
3839 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3840 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3841 &in6addr_linklocal_allrouters);
3842 else
caf92bc4 3843 goto put;
1da177e4 3844
caf92bc4 3845 write_lock(&idev->lock);
bd11f074
MŻ		 3846 idev->rs_interval = rfc3315_s14_backoff_update(
3847 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
b7b1bfce
HFS		 3848 /* The wait after the last probe can be shorter */
3849 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3850 idev->cnf.rtr_solicits) ?
3851 idev->cnf.rtr_solicit_delay :
bd11f074 3852 idev->rs_interval);
1da177e4 3853 } else {
1da177e4
LT		 3854 /*
3855 * Note: we do not support deprecated "all on-link"
3856 * assumption any longer.
3857 */
91df42be 3858 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3859 }
3860
3861out:
b7b1bfce 3862 write_unlock(&idev->lock);
caf92bc4 3863put:
b7b1bfce 3864 in6_dev_put(idev);
1da177e4
LT		 3865}
3866
3867/*
3868 * Duplicate Address Detection
3869 */
3c21edbd
YH		 3870static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3871{
3872 unsigned long rand_num;
3873 struct inet6_dev *idev = ifp->idev;
adc176c5 3874 u64 nonce;
3c21edbd 3875
95c385b4
NH		 3876 if (ifp->flags & IFA_F_OPTIMISTIC)
3877 rand_num = 0;
3878 else
63862b5b 3879 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3880
adc176c5
EN		 3881 nonce = 0;
3882 if (idev->cnf.enhanced_dad ||
3883 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3884 do
3885 get_random_bytes(&nonce, 6);
3886 while (nonce == 0);
3887 }
3888 ifp->dad_nonce = nonce;
b7b1bfce 3889 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3890 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3891}
3892
c15b1cca 3893static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3894{
3895 struct inet6_dev *idev = ifp->idev;
3896 struct net_device *dev = idev->dev;
764d3be6 3897 bool bump_id, notify = false;
afb1d4b5 3898 struct net *net;
1da177e4
LT		 3899
3900 addrconf_join_solict(dev, &ifp->addr);
3901
63862b5b 3902 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3903
3904 read_lock_bh(&idev->lock);
622ccdf1 3905 spin_lock(&ifp->lock);
e9d3e084 3906 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3907 goto out;
1da177e4 3908
afb1d4b5 3909 net = dev_net(dev);
1da177e4 3910 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
afb1d4b5 3911 (net->ipv6.devconf_all->accept_dad < 1 &&
a2d3f3e3 3912 idev->cnf.accept_dad < 1) ||
55ebaef1
NT		 3913 !(ifp->flags&IFA_F_TENTATIVE) ||
3914 ifp->flags & IFA_F_NODAD) {
c76fe2d9
DA		 3915 bool send_na = false;
3916
3917 if (ifp->flags & IFA_F_TENTATIVE &&
3918 !(ifp->flags & IFA_F_OPTIMISTIC))
3919 send_na = true;
764d3be6 3920 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3921 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3922 spin_unlock(&ifp->lock);
1da177e4
LT		 3923 read_unlock_bh(&idev->lock);
3924
c76fe2d9 3925 addrconf_dad_completed(ifp, bump_id, send_na);
1da177e4
LT		 3926 return;
3927 }
3928
6732bade 3929 if (!(idev->if_flags & IF_READY)) {
21809faf 3930 spin_unlock(&ifp->lock);
6732bade 3931 read_unlock_bh(&idev->lock);
3c21edbd 3932 /*
590a9887 3933 * If the device is not ready:
3c21edbd
YH		 3934 * - keep it tentative if it is a permanent address.
3935 * - otherwise, kill it.
3936 */
3937 in6_ifa_hold(ifp);
cc411d0b 3938 addrconf_dad_stop(ifp, 0);
6732bade 3939 return;
3c21edbd 3940 }
95c385b4
NH		 3941
3942 /*
3943 * Optimistic nodes can start receiving
3944 * Frames right away
3945 */
7fd2561e 3946 if (ifp->flags & IFA_F_OPTIMISTIC) {
afb1d4b5
DA		 3947 ip6_ins_rt(net, ifp->rt);
3948 if (ipv6_use_optimistic_addr(net, idev)) {
7fd2561e
EK		 3949 /* Because optimistic nodes can use this address,
3950 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3951 */
16186a82 3952 notify = true;
7fd2561e
EK		 3953 }
3954 }
95c385b4 3955
6732bade 3956 addrconf_dad_kick(ifp);
1da177e4 3957out:
622ccdf1 3958 spin_unlock(&ifp->lock);
1da177e4 3959 read_unlock_bh(&idev->lock);
16186a82
SAK		 3960 if (notify)
3961 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 3962}
3963
c15b1cca 3964static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3965{
c15b1cca
HFS		 3966 bool begin_dad = false;
3967
8e8e676d 3968 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3969 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3970 ifp->state = INET6_IFADDR_STATE_PREDAD;
3971 begin_dad = true;
3972 }
8e8e676d 3973 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3974
3975 if (begin_dad)
3976 addrconf_mod_dad_work(ifp, 0);
3977}
3978
3979static void addrconf_dad_work(struct work_struct *w)
3980{
3981 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3982 struct inet6_ifaddr,
3983 dad_work);
1da177e4 3984 struct inet6_dev *idev = ifp->idev;
764d3be6 3985 bool bump_id, disable_ipv6 = false;
1da177e4
LT		 3986 struct in6_addr mcaddr;
3987
c15b1cca
HFS		 3988 enum {
3989 DAD_PROCESS,
3990 DAD_BEGIN,
3991 DAD_ABORT,
3992 } action = DAD_PROCESS;
3993
3994 rtnl_lock();
3995
8e8e676d 3996 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3997 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3998 action = DAD_BEGIN;
3999 ifp->state = INET6_IFADDR_STATE_DAD;
4000 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4001 action = DAD_ABORT;
4002 ifp->state = INET6_IFADDR_STATE_POSTDAD;
85b51b12 4003
35e015e1
MC		 4004 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4005 idev->cnf.accept_dad > 1) &&
4006 !idev->cnf.disable_ipv6 &&
85b51b12
MM		 4007 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4008 struct in6_addr addr;
4009
4010 addr.s6_addr32[0] = htonl(0xfe800000);
4011 addr.s6_addr32[1] = 0;
4012
4013 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4014 ipv6_addr_equal(&ifp->addr, &addr)) {
4015 /* DAD failed for link-local based on MAC */
4016 idev->cnf.disable_ipv6 = 1;
4017
4018 pr_info("%s: IPv6 being disabled!\n",
4019 ifp->idev->dev->name);
4020 disable_ipv6 = true;
4021 }
4022 }
c15b1cca 4023 }
8e8e676d 4024 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 4025
4026 if (action == DAD_BEGIN) {
4027 addrconf_dad_begin(ifp);
4028 goto out;
4029 } else if (action == DAD_ABORT) {
751eb6b6 4030 in6_ifa_hold(ifp);
c15b1cca 4031 addrconf_dad_stop(ifp, 1);
85b51b12
MM		 4032 if (disable_ipv6)
4033 addrconf_ifdown(idev->dev, 0);
c15b1cca
HFS		 4034 goto out;
4035 }
4036
b7b1bfce 4037 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 4038 goto out;
4039
c15b1cca 4040 write_lock_bh(&idev->lock);
122e4519 4041 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 4042 write_unlock_bh(&idev->lock);
1da177e4
LT		 4043 goto out;
4044 }
21809faf 4045
4046 spin_lock(&ifp->lock);
622ccdf1
HX		 4047 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4048 spin_unlock(&ifp->lock);
c15b1cca 4049 write_unlock_bh(&idev->lock);
622ccdf1
HX		 4050 goto out;
4051 }
4052
b7b1bfce 4053 if (ifp->dad_probes == 0) {
c76fe2d9
DA		 4054 bool send_na = false;
4055
1da177e4
LT		 4056 /*
4057 * DAD was successful
4058 */
4059
c76fe2d9
DA		 4060 if (ifp->flags & IFA_F_TENTATIVE &&
4061 !(ifp->flags & IFA_F_OPTIMISTIC))
4062 send_na = true;
764d3be6 4063 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 4064 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 4065 spin_unlock(&ifp->lock);
c15b1cca 4066 write_unlock_bh(&idev->lock);
1da177e4 4067
c76fe2d9 4068 addrconf_dad_completed(ifp, bump_id, send_na);
1da177e4
LT		 4069
4070 goto out;
4071 }
4072
b7b1bfce 4073 ifp->dad_probes--;
c15b1cca
HFS		 4074 addrconf_mod_dad_work(ifp,
4075 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 4076 spin_unlock(&ifp->lock);
c15b1cca 4077 write_unlock_bh(&idev->lock);
1da177e4
LT		 4078
4079 /* send a neighbour solicitation for our addr */
1da177e4 4080 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
adc176c5
EN		 4081 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4082 ifp->dad_nonce);
1da177e4
LT		 4083out:
4084 in6_ifa_put(ifp);
c15b1cca 4085 rtnl_unlock();
1da177e4
LT		 4086}
4087
11ffff75
HFS		 4088/* ifp->idev must be at least read locked */
4089static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4090{
4091 struct inet6_ifaddr *ifpiter;
4092 struct inet6_dev *idev = ifp->idev;
4093
602582ca
HFS		 4094 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4095 if (ifpiter->scope > IFA_LINK)
4096 break;
11ffff75
HFS		 4097 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4098 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4099 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4100 IFA_F_PERMANENT)
4101 return false;
4102 }
4103 return true;
4104}
4105
c76fe2d9
DA		 4106static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4107 bool send_na)
1da177e4 4108{
e21e8467 4109 struct net_device *dev = ifp->idev->dev;
b7b1bfce 4110 struct in6_addr lladdr;
b173ee48 4111 bool send_rs, send_mld;
b7b1bfce 4112
c15b1cca 4113 addrconf_del_dad_work(ifp);
1da177e4
LT		 4114
4115 /*
4116 * Configure the address for reception. Now it is valid.
4117 */
4118
4119 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4120
026359bc
TA		 4121 /* If added prefix is link local and we are prepared to process
4122 router advertisements, start sending router solicitations.
1da177e4
LT		 4123 */
4124
1ec047eb 4125 read_lock_bh(&ifp->idev->lock);
11ffff75 4126 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 4127 send_rs = send_mld &&
4128 ipv6_accept_ra(ifp->idev) &&
bd11f074 4129 ifp->idev->cnf.rtr_solicits != 0 &&
b173ee48 4130 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 4131 read_unlock_bh(&ifp->idev->lock);
4132
b173ee48
HFS		 4133 /* While dad is in progress mld report's source address is in6_addrany.
4134 * Resend with proper ll now.
4135 */
4136 if (send_mld)
4137 ipv6_mc_dad_complete(ifp->idev);
4138
c76fe2d9
DA		 4139 /* send unsolicited NA if enabled */
4140 if (send_na &&
4141 (ifp->idev->cnf.ndisc_notify ||
4142 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4143 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4144 /*router=*/ !!ifp->idev->cnf.forwarding,
4145 /*solicited=*/ false, /*override=*/ true,
4146 /*inc_opt=*/ true);
4147 }
4148
1ec047eb 4149 if (send_rs) {
1da177e4
LT		 4150 /*
4151 * If a host as already performed a random delay
4152 * [...] as part of DAD [...] there is no need
4153 * to delay again before sending the first RS
4154 */
1ec047eb 4155 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 4156 return;
1ec047eb 4157 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 4158
b7b1bfce
HFS		 4159 write_lock_bh(&ifp->idev->lock);
4160 spin_lock(&ifp->lock);
bd11f074
MŻ		 4161 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4162 ifp->idev->cnf.rtr_solicit_interval);
b7b1bfce 4163 ifp->idev->rs_probes = 1;
1da177e4 4164 ifp->idev->if_flags |= IF_RS_SENT;
bd11f074 4165 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
b7b1bfce
HFS		 4166 spin_unlock(&ifp->lock);
4167 write_unlock_bh(&ifp->idev->lock);
1da177e4 4168 }
764d3be6
PA		 4169
4170 if (bump_id)
4171 rt_genid_bump_ipv6(dev_net(dev));
a11a7f71
MH		 4172
4173 /* Make sure that a new temporary address will be created
4174 * before this temporary address becomes deprecated.
4175 */
4176 if (ifp->flags & IFA_F_TEMPORARY)
4177 addrconf_verify_rtnl();
1da177e4
LT		 4178}
4179
896585d4 4180static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
e21e8467 4181{
c5e33bdd
YH		 4182 struct inet6_ifaddr *ifp;
4183
4184 read_lock_bh(&idev->lock);
502a2ffd 4185 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 4186 spin_lock(&ifp->lock);
896585d4
HL		 4187 if ((ifp->flags & IFA_F_TENTATIVE &&
4188 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4189 if (restart)
4190 ifp->state = INET6_IFADDR_STATE_PREDAD;
f2344a13 4191 addrconf_dad_kick(ifp);
896585d4 4192 }
21809faf 4193 spin_unlock(&ifp->lock);
c5e33bdd
YH		 4194 }
4195 read_unlock_bh(&idev->lock);
4196}
4197
1da177e4
LT		 4198#ifdef CONFIG_PROC_FS
4199struct if6_iter_state {
3c40090a 4200 struct seq_net_private p;
1da177e4 4201 int bucket;
1d578303 4202 int offset;
1da177e4
LT		 4203};
4204
1d578303 4205static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4 4206{
1da177e4 4207 struct if6_iter_state *state = seq->private;
1218854a 4208 struct net *net = seq_file_net(seq);
a5c1d98f 4209 struct inet6_ifaddr *ifa = NULL;
1d578303 4210 int p = 0;
1da177e4 4211
1d578303
MM		 4212 /* initial bucket if pos is 0 */
4213 if (pos == 0) {
4214 state->bucket = 0;
4215 state->offset = 0;
4216 }
4217
4218 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
a5c1d98f 4219 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
1d578303 4220 addr_lst) {
9f0d3c27
ED		 4221 if (!net_eq(dev_net(ifa->idev->dev), net))
4222 continue;
1d578303
MM		 4223 /* sync with offset */
4224 if (p < state->offset) {
4225 p++;
4226 continue;
4227 }
9f0d3c27 4228 return ifa;
1d578303
MM		 4229 }
4230
4231 /* prepare for next bucket */
4232 state->offset = 0;
4233 p = 0;
1da177e4 4234 }
c2e21293 4235 return NULL;
1da177e4
LT		 4236}
4237
c2e21293 4238static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4239 struct inet6_ifaddr *ifa)
1da177e4
LT		 4240{
4241 struct if6_iter_state *state = seq->private;
1218854a 4242 struct net *net = seq_file_net(seq);
1da177e4 4243
a5c1d98f 4244 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
9f0d3c27
ED		 4245 if (!net_eq(dev_net(ifa->idev->dev), net))
4246 continue;
1d578303 4247 state->offset++;
9f0d3c27 4248 return ifa;
1d578303 4249 }
3c40090a 4250
86f9bd1f 4251 state->offset = 0;
c2e21293 4252 while (++state->bucket < IN6_ADDR_HSIZE) {
a5c1d98f 4253 hlist_for_each_entry_rcu(ifa,
c2e21293 4254 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 4255 if (!net_eq(dev_net(ifa->idev->dev), net))
4256 continue;
9f0d3c27 4257 return ifa;
c2e21293 4258 }
1da177e4 4259 }
3c40090a 4260
c2e21293 4261 return NULL;
1da177e4
LT		 4262}
4263
1da177e4 4264static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
a5c1d98f 4265 __acquires(rcu)
1da177e4 4266{
a5c1d98f 4267 rcu_read_lock();
1d578303 4268 return if6_get_first(seq, *pos);
1da177e4
LT		 4269}
4270
4271static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4272{
4273 struct inet6_ifaddr *ifa;
4274
4275 ifa = if6_get_next(seq, v);
4276 ++*pos;
4277 return ifa;
4278}
4279
4280static void if6_seq_stop(struct seq_file *seq, void *v)
a5c1d98f 4281 __releases(rcu)
1da177e4 4282{
a5c1d98f 4283 rcu_read_unlock();
1da177e4
LT		 4284}
4285
4286static int if6_seq_show(struct seq_file *seq, void *v)
4287{
4288 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4289 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4290 &ifp->addr,
1da177e4
LT		 4291 ifp->idev->dev->ifindex,
4292 ifp->prefix_len,
4293 ifp->scope,
971a351c 4294 (u8) ifp->flags,
1da177e4
LT		 4295 ifp->idev->dev->name);
4296 return 0;
4297}
4298
56b3d975 4299static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4300 .start = if6_seq_start,
4301 .next = if6_seq_next,
4302 .show = if6_seq_show,
4303 .stop = if6_seq_stop,
4304};
4305
2c8c1e72 4306static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4307{
c3506372
CH		 4308 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4309 sizeof(struct if6_iter_state)))
1da177e4
LT		 4310 return -ENOMEM;
4311 return 0;
4312}
4313
2c8c1e72 4314static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4315{
ece31ffd 4316 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4317}
4318
4319static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4320 .init = if6_proc_net_init,
4321 .exit = if6_proc_net_exit,
3c40090a
DL		 4322};
4323
4324int __init if6_proc_init(void)
4325{
4326 return register_pernet_subsys(&if6_proc_net_ops);
4327}
4328
1da177e4
LT		 4329void if6_proc_exit(void)
4330{
3c40090a 4331 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4332}
4333#endif /* CONFIG_PROC_FS */
4334
07a93626 4335#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4336/* Check if address is a home address configured on any interface. */
b71d1d42 4337int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c 4338{
3f27fb23 4339 unsigned int hash = inet6_addr_hash(net, addr);
c2e21293 4340 struct inet6_ifaddr *ifp = NULL;
3f27fb23 4341 int ret = 0;
c2e21293 4342
4e5f47ab
ED		 4343 rcu_read_lock();
4344 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 4345 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 4346 continue;
caad295f 4347 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4348 (ifp->flags & IFA_F_HOMEADDRESS)) {
4349 ret = 1;
4350 break;
4351 }
4352 }
4e5f47ab 4353 rcu_read_unlock();
3b9f9a1c
NT		 4354 return ret;
4355}
4356#endif
4357
1da177e4
LT		 4358/*
4359 * Periodic address status verification
4360 */
4361
c15b1cca 4362static void addrconf_verify_rtnl(void)
1da177e4 4363{
b2db7564 4364 unsigned long now, next, next_sec, next_sched;
1da177e4 4365 struct inet6_ifaddr *ifp;
1da177e4
LT		 4366 int i;
4367
c15b1cca
HFS		 4368 ASSERT_RTNL();
4369
5c578aed 4370 rcu_read_lock_bh();
1da177e4 4371 now = jiffies;
b2db7564 4372 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4373
c15b1cca 4374 cancel_delayed_work(&addr_chk_work);
1da177e4 4375
bcdd553f 4376 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4377restart:
c15b1cca 4378 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 4379 unsigned long age;
1da177e4 4380
fad8da3e
YA		 4381 /* When setting preferred_lft to a value not zero or
4382 * infinity, while valid_lft is infinity
4383 * IFA_F_PERMANENT has a non-infinity life time.
4384 */
4385 if ((ifp->flags & IFA_F_PERMANENT) &&
4386 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4387 continue;
4388
4389 spin_lock(&ifp->lock);
b2db7564
YH		 4390 /* We try to batch several events at once. */
4391 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4392
8f27ebb9
YH		 4393 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4394 age >= ifp->valid_lft) {
1da177e4
LT		 4395 spin_unlock(&ifp->lock);
4396 in6_ifa_hold(ifp);
1da177e4
LT		 4397 ipv6_del_addr(ifp);
4398 goto restart;
8f27ebb9
YH		 4399 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4400 spin_unlock(&ifp->lock);
4401 continue;
1da177e4 4402 } else if (age >= ifp->prefered_lft) {
a1ed0526 4403 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4404 int deprecate = 0;
4405
4406 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4407 deprecate = 1;
4408 ifp->flags |= IFA_F_DEPRECATED;
4409 }
4410
fad8da3e
YA		 4411 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4412 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4413 next = ifp->tstamp + ifp->valid_lft * HZ;
4414
4415 spin_unlock(&ifp->lock);
4416
4417 if (deprecate) {
4418 in6_ifa_hold(ifp);
1da177e4
LT		 4419
4420 ipv6_ifa_notify(0, ifp);
4421 in6_ifa_put(ifp);
4422 goto restart;
4423 }
1da177e4
LT		 4424 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4425 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4426 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4427 ifp->idev->cnf.dad_transmits *
1f9248e5 4428 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 4429
1da177e4
LT		 4430 if (age >= ifp->prefered_lft - regen_advance) {
4431 struct inet6_ifaddr *ifpub = ifp->ifpub;
4432 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4433 next = ifp->tstamp + ifp->prefered_lft * HZ;
4434 if (!ifp->regen_count && ifpub) {
4435 ifp->regen_count++;
4436 in6_ifa_hold(ifp);
4437 in6_ifa_hold(ifpub);
4438 spin_unlock(&ifp->lock);
5c578aed 4439
291d809b
HY		 4440 spin_lock(&ifpub->lock);
4441 ifpub->regen_count = 0;
4442 spin_unlock(&ifpub->lock);
e64e469b 4443 rcu_read_unlock_bh();
fffcefe9 4444 ipv6_create_tempaddr(ifpub, ifp, true);
1da177e4
LT		 4445 in6_ifa_put(ifpub);
4446 in6_ifa_put(ifp);
e64e469b 4447 rcu_read_lock_bh();
1da177e4
LT		 4448 goto restart;
4449 }
4450 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4451 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4452 spin_unlock(&ifp->lock);
1da177e4
LT		 4453 } else {
4454 /* ifp->prefered_lft <= ifp->valid_lft */
4455 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4456 next = ifp->tstamp + ifp->prefered_lft * HZ;
4457 spin_unlock(&ifp->lock);
4458 }
4459 }
1da177e4
LT		 4460 }
4461
b2db7564
YH		 4462 next_sec = round_jiffies_up(next);
4463 next_sched = next;
4464
4465 /* If rounded timeout is accurate enough, accept it. */
4466 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4467 next_sched = next_sec;
4468
4469 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4470 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4471 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4472
e32ac250
JP		 4473 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4474 now, next, next_sec, next_sched);
c15b1cca 4475 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4476 rcu_read_unlock_bh();
1da177e4
LT		 4477}
4478
c15b1cca
HFS		 4479static void addrconf_verify_work(struct work_struct *w)
4480{
4481 rtnl_lock();
4482 addrconf_verify_rtnl();
4483 rtnl_unlock();
4484}
4485
4486static void addrconf_verify(void)
4487{
4488 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4489}
4490
caeaba79
ND		 4491static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4492 struct in6_addr **peer_pfx)
461d8837
TG		 4493{
4494 struct in6_addr *pfx = NULL;
4495
caeaba79
ND		 4496 *peer_pfx = NULL;
4497
461d8837
TG		 4498 if (addr)
4499 pfx = nla_data(addr);
4500
4501 if (local) {
4502 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4503 *peer_pfx = pfx;
4504 pfx = nla_data(local);
461d8837
TG		 4505 }
4506
4507 return pfx;
4508}
4509
ef7c79ed 4510static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4511 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4512 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4513 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4514 [IFA_FLAGS] = { .len = sizeof(u32) },
8308f3ff 4515 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
6ecf4c37 4516 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
461d8837
TG		 4517};
4518
1da177e4 4519static int
c21ef3e3
DA		 4520inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4521 struct netlink_ext_ack *extack)
1da177e4 4522{
3b1e0a65 4523 struct net *net = sock_net(skb->sk);
b933f716
TG		 4524 struct ifaddrmsg *ifm;
4525 struct nlattr *tb[IFA_MAX+1];
caeaba79 4526 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4527 u32 ifa_flags;
b933f716 4528 int err;
1da177e4 4529
fceb6435 4530 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4531 extack);
b933f716
TG		 4532 if (err < 0)
4533 return err;
4534
4535 ifm = nlmsg_data(nlh);
caeaba79 4536 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4537 if (!pfx)
1da177e4
LT		 4538 return -EINVAL;
4539
6046d5b4
HK		 4540 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4541
4542 /* We ignore other flags so far. */
4543 ifa_flags &= IFA_F_MANAGETEMPADDR;
4544
4545 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4546 ifm->ifa_prefixlen);
1da177e4
LT		 4547}
4548
8308f3ff
DA		 4549static int modify_prefix_route(struct inet6_ifaddr *ifp,
4550 unsigned long expires, u32 flags)
4551{
4552 struct fib6_info *f6i;
e7c7faa9 4553 u32 prio;
8308f3ff
DA		 4554
4555 f6i = addrconf_get_prefix_route(&ifp->addr,
4556 ifp->prefix_len,
4557 ifp->idev->dev,
4558 0, RTF_GATEWAY | RTF_DEFAULT);
4559 if (!f6i)
4560 return -ENOENT;
4561
e7c7faa9
DA		 4562 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4563 if (f6i->fib6_metric != prio) {
4564 /* delete old one */
4565 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
4566
8308f3ff
DA		 4567 /* add new one */
4568 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4569 ifp->rt_priority, ifp->idev->dev,
4570 expires, flags, GFP_KERNEL);
8308f3ff
DA		 4571 } else {
4572 if (!expires)
4573 fib6_clean_expires(f6i);
4574 else
4575 fib6_set_expires(f6i, expires);
4576
4577 fib6_info_release(f6i);
4578 }
4579
4580 return 0;
4581}
4582
d169a1f8 4583static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
081bba5b 4584{
6f704992
YH		 4585 u32 flags;
4586 clock_t expires;
4bed72e4 4587 unsigned long timeout;
53bd6749 4588 bool was_managetempaddr;
5b84efec 4589 bool had_prefixroute;
46d48046 4590
c15b1cca
HFS		 4591 ASSERT_RTNL();
4592
d169a1f8 4593 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
081bba5b
NT		 4594 return -EINVAL;
4595
d169a1f8 4596 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
53bd6749
JP		 4597 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4598 return -EINVAL;
4599
f1c02cfb 4600 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
d169a1f8 4601 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
f1c02cfb 4602
d169a1f8 4603 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4bed72e4
YH		 4604 if (addrconf_finite_timeout(timeout)) {
4605 expires = jiffies_to_clock_t(timeout * HZ);
d169a1f8 4606 cfg->valid_lft = timeout;
6f704992 4607 flags = RTF_EXPIRES;
4bed72e4
YH		 4608 } else {
4609 expires = 0;
4610 flags = 0;
d169a1f8 4611 cfg->ifa_flags |= IFA_F_PERMANENT;
6f704992 4612 }
081bba5b 4613
d169a1f8 4614 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4bed72e4
YH		 4615 if (addrconf_finite_timeout(timeout)) {
4616 if (timeout == 0)
d169a1f8
DA		 4617 cfg->ifa_flags |= IFA_F_DEPRECATED;
4618 cfg->preferred_lft = timeout;
4bed72e4 4619 }
081bba5b
NT		 4620
4621 spin_lock_bh(&ifp->lock);
53bd6749 4622 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4623 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4624 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4625 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4626 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4627 IFA_F_NOPREFIXROUTE);
d169a1f8 4628 ifp->flags |= cfg->ifa_flags;
081bba5b 4629 ifp->tstamp = jiffies;
d169a1f8
DA		 4630 ifp->valid_lft = cfg->valid_lft;
4631 ifp->prefered_lft = cfg->preferred_lft;
081bba5b 4632
8308f3ff
DA		 4633 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4634 ifp->rt_priority = cfg->rt_priority;
081bba5b
NT		 4635
4636 spin_unlock_bh(&ifp->lock);
4637 if (!(ifp->flags&IFA_F_TENTATIVE))
4638 ipv6_ifa_notify(0, ifp);
081bba5b 4639
d169a1f8 4640 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
8308f3ff
DA		 4641 int rc = -ENOENT;
4642
4643 if (had_prefixroute)
4644 rc = modify_prefix_route(ifp, expires, flags);
4645
4646 /* prefix route could have been deleted; if so restore it */
4647 if (rc == -ENOENT) {
4648 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4649 ifp->rt_priority, ifp->idev->dev,
4650 expires, flags, GFP_KERNEL);
4651 }
5b84efec
TH		 4652 } else if (had_prefixroute) {
4653 enum cleanup_prefix_rt_t action;
4654 unsigned long rt_expires;
4655
4656 write_lock_bh(&ifp->idev->lock);
4657 action = check_cleanup_prefix_route(ifp, &rt_expires);
4658 write_unlock_bh(&ifp->idev->lock);
4659
4660 if (action != CLEANUP_PREFIX_RT_NOP) {
4661 cleanup_prefix_route(ifp, rt_expires,
4662 action == CLEANUP_PREFIX_RT_DEL);
4663 }
761aac73 4664 }
53bd6749
JP		 4665
4666 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
d169a1f8
DA		 4667 if (was_managetempaddr &&
4668 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4669 cfg->valid_lft = 0;
4670 cfg->preferred_lft = 0;
4671 }
4672 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4673 cfg->preferred_lft, !was_managetempaddr,
4674 jiffies);
53bd6749
JP		 4675 }
4676
c15b1cca 4677 addrconf_verify_rtnl();
081bba5b
NT		 4678
4679 return 0;
4680}
4681
1da177e4 4682static int
c21ef3e3
DA		 4683inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4684 struct netlink_ext_ack *extack)
1da177e4 4685{
3b1e0a65 4686 struct net *net = sock_net(skb->sk);
461d8837
TG		 4687 struct ifaddrmsg *ifm;
4688 struct nlattr *tb[IFA_MAX+1];
19b1518c 4689 struct in6_addr *peer_pfx;
7198f8ce
TG		 4690 struct inet6_ifaddr *ifa;
4691 struct net_device *dev;
f1c02cfb 4692 struct inet6_dev *idev;
19b1518c 4693 struct ifa6_config cfg;
461d8837 4694 int err;
1da177e4 4695
fceb6435 4696 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4697 extack);
461d8837
TG		 4698 if (err < 0)
4699 return err;
4700
19b1518c
DA		 4701 memset(&cfg, 0, sizeof(cfg));
4702
461d8837 4703 ifm = nlmsg_data(nlh);
19b1518c
DA		 4704 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4705 if (!cfg.pfx)
1da177e4
LT		 4706 return -EINVAL;
4707
19b1518c
DA		 4708 cfg.peer_pfx = peer_pfx;
4709 cfg.plen = ifm->ifa_prefixlen;
8308f3ff
DA		 4710 if (tb[IFA_RT_PRIORITY])
4711 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4712
19b1518c
DA		 4713 cfg.valid_lft = INFINITY_LIFE_TIME;
4714 cfg.preferred_lft = INFINITY_LIFE_TIME;
4715
461d8837 4716 if (tb[IFA_CACHEINFO]) {
0778769d 4717 struct ifa_cacheinfo *ci;
461d8837
TG		 4718
4719 ci = nla_data(tb[IFA_CACHEINFO]);
19b1518c
DA		 4720 cfg.valid_lft = ci->ifa_valid;
4721 cfg.preferred_lft = ci->ifa_prefered;
0778769d
NT		 4722 }
4723
af284937 4724 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4725 if (!dev)
7198f8ce
TG		 4726 return -ENODEV;
4727
19b1518c
DA		 4728 if (tb[IFA_FLAGS])
4729 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4730 else
4731 cfg.ifa_flags = ifm->ifa_flags;
479840ff 4732
55ebaef1 4733 /* We ignore other flags so far. */
19b1518c
DA		 4734 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4735 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4736 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
f1c02cfb
SD		 4737
4738 idev = ipv6_find_idev(dev);
4739 if (IS_ERR(idev))
4740 return PTR_ERR(idev);
4741
4742 if (!ipv6_allow_optimistic_dad(net, idev))
19b1518c 4743 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
f1c02cfb 4744
19b1518c
DA		 4745 if (cfg.ifa_flags & IFA_F_NODAD &&
4746 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
f1c02cfb
SD		 4747 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4748 return -EINVAL;
4749 }
55ebaef1 4750
19b1518c 4751 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
63159f29 4752 if (!ifa) {
7198f8ce
TG		 4753 /*
4754 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4755 * userspace already relies on not having to provide this.
7198f8ce 4756 */
19b1518c 4757 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
081bba5b
NT		 4758 }
4759
7198f8ce
TG		 4760 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4761 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4762 err = -EEXIST;
4763 else
d169a1f8 4764 err = inet6_addr_modify(ifa, &cfg);
7198f8ce
TG		 4765
4766 in6_ifa_put(ifa);
4767
4768 return err;
1da177e4
LT		 4769}
4770
479840ff 4771static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4772 u8 scope, int ifindex)
4773{
4774 struct ifaddrmsg *ifm;
4775
4776 ifm = nlmsg_data(nlh);
4777 ifm->ifa_family = AF_INET6;
4778 ifm->ifa_prefixlen = prefixlen;
4779 ifm->ifa_flags = flags;
4780 ifm->ifa_scope = scope;
4781 ifm->ifa_index = ifindex;
4782}
4783
85486af0
TG		 4784static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4785 unsigned long tstamp, u32 preferred, u32 valid)
4786{
4787 struct ifa_cacheinfo ci;
4788
18a31e1e
TG		 4789 ci.cstamp = cstamp_delta(cstamp);
4790 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4791 ci.ifa_prefered = preferred;
4792 ci.ifa_valid = valid;
4793
4794 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4795}
4796
101bb229
TG		 4797static inline int rt_scope(int ifa_scope)
4798{
4799 if (ifa_scope & IFA_HOST)
4800 return RT_SCOPE_HOST;
4801 else if (ifa_scope & IFA_LINK)
4802 return RT_SCOPE_LINK;
4803 else if (ifa_scope & IFA_SITE)
4804 return RT_SCOPE_SITE;
4805 else
4806 return RT_SCOPE_UNIVERSE;
4807}
4808
0ab6803b
TG		 4809static inline int inet6_ifaddr_msgsize(void)
4810{
339bf98f 4811 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4812 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4813 + nla_total_size(16) /* IFA_ADDRESS */
479840ff 4814 + nla_total_size(sizeof(struct ifa_cacheinfo))
8308f3ff
DA		 4815 + nla_total_size(4) /* IFA_FLAGS */
4816 + nla_total_size(4) /* IFA_RT_PRIORITY */;
0ab6803b 4817}
c5396a31 4818
6ba1e6e8
DA		 4819enum addr_type_t {
4820 UNICAST_ADDR,
4821 MULTICAST_ADDR,
4822 ANYCAST_ADDR,
4823};
4824
203651b6
CB		 4825struct inet6_fill_args {
4826 u32 portid;
4827 u32 seq;
4828 int event;
4829 unsigned int flags;
4830 int netnsid;
6371a71f 4831 int ifindex;
6ba1e6e8 4832 enum addr_type_t type;
203651b6
CB		 4833};
4834
1da177e4 4835static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
203651b6 4836 struct inet6_fill_args *args)
1da177e4 4837{
1da177e4 4838 struct nlmsghdr *nlh;
85486af0 4839 u32 preferred, valid;
1da177e4 4840
203651b6
CB		 4841 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4842 sizeof(struct ifaddrmsg), args->flags);
63159f29 4843 if (!nlh)
26932566 4844 return -EMSGSIZE;
0ab6803b 4845
101bb229
TG		 4846 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4847 ifa->idev->dev->ifindex);
4848
203651b6
CB		 4849 if (args->netnsid >= 0 &&
4850 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
6ecf4c37
CB		 4851 goto error;
4852
fad8da3e
YA		 4853 if (!((ifa->flags&IFA_F_PERMANENT) &&
4854 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4855 preferred = ifa->prefered_lft;
4856 valid = ifa->valid_lft;
4857 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4858 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4859 if (preferred > tval)
4860 preferred -= tval;
4861 else
4862 preferred = 0;
f56619fc
BH		 4863 if (valid != INFINITY_LIFE_TIME) {
4864 if (valid > tval)
4865 valid -= tval;
4866 else
4867 valid = 0;
4868 }
1da177e4
LT		 4869 }
4870 } else {
85486af0
TG		 4871 preferred = INFINITY_LIFE_TIME;
4872 valid = INFINITY_LIFE_TIME;
4873 }
4874
7996c799 4875 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4876 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4877 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4878 goto error;
4879 } else
930345ea 4880 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4881 goto error;
4882
8308f3ff
DA		 4883 if (ifa->rt_priority &&
4884 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
4885 goto error;
4886
caeaba79
ND		 4887 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4888 goto error;
1da177e4 4889
479840ff
JP		 4890 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4891 goto error;
4892
053c095a
JB		 4893 nlmsg_end(skb, nlh);
4894 return 0;
caeaba79
ND		 4895
4896error:
4897 nlmsg_cancel(skb, nlh);
4898 return -EMSGSIZE;
1da177e4
LT		 4899}
4900
4901static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
203651b6 4902 struct inet6_fill_args *args)
1da177e4 4903{
1da177e4 4904 struct nlmsghdr *nlh;
101bb229
TG		 4905 u8 scope = RT_SCOPE_UNIVERSE;
4906 int ifindex = ifmca->idev->dev->ifindex;
4907
4908 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4909 scope = RT_SCOPE_SITE;
1da177e4 4910
203651b6
CB		 4911 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4912 sizeof(struct ifaddrmsg), args->flags);
63159f29 4913 if (!nlh)
26932566 4914 return -EMSGSIZE;
85486af0 4915
203651b6
CB		 4916 if (args->netnsid >= 0 &&
4917 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
6ecf4c37
CB		 4918 return -EMSGSIZE;
4919
0ab6803b 4920 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4921 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4922 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4923 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4924 nlmsg_cancel(skb, nlh);
4925 return -EMSGSIZE;
4926 }
85486af0 4927
053c095a
JB		 4928 nlmsg_end(skb, nlh);
4929 return 0;
1da177e4
LT		 4930}
4931
4932static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
203651b6 4933 struct inet6_fill_args *args)
1da177e4 4934{
9ee8cbb2
DA		 4935 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
4936 int ifindex = dev ? dev->ifindex : 1;
1da177e4 4937 struct nlmsghdr *nlh;
101bb229 4938 u8 scope = RT_SCOPE_UNIVERSE;
101bb229
TG		 4939
4940 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4941 scope = RT_SCOPE_SITE;
1da177e4 4942
203651b6
CB		 4943 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4944 sizeof(struct ifaddrmsg), args->flags);
63159f29 4945 if (!nlh)
26932566 4946 return -EMSGSIZE;
85486af0 4947
203651b6
CB		 4948 if (args->netnsid >= 0 &&
4949 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
6ecf4c37
CB		 4950 return -EMSGSIZE;
4951
0ab6803b 4952 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4953 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4954 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4955 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4956 nlmsg_cancel(skb, nlh);
4957 return -EMSGSIZE;
4958 }
1da177e4 4959
053c095a
JB		 4960 nlmsg_end(skb, nlh);
4961 return 0;
1da177e4
LT		 4962}
4963
234b27c3
ED		 4964/* called with rcu_read_lock() */
4965static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
fe884c2b 4966 struct netlink_callback *cb, int s_ip_idx,
6ba1e6e8 4967 struct inet6_fill_args *fillargs)
234b27c3 4968{
234b27c3
ED		 4969 struct ifmcaddr6 *ifmca;
4970 struct ifacaddr6 *ifaca;
fe884c2b 4971 int ip_idx = 0;
234b27c3 4972 int err = 1;
234b27c3
ED		 4973
4974 read_lock_bh(&idev->lock);
6ba1e6e8 4975 switch (fillargs->type) {
502a2ffd 4976 case UNICAST_ADDR: {
4977 struct inet6_ifaddr *ifa;
6ba1e6e8 4978 fillargs->event = RTM_NEWADDR;
502a2ffd 4979
234b27c3 4980 /* unicast address incl. temp addr */
502a2ffd 4981 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4ba4c566
DA		 4982 if (ip_idx < s_ip_idx)
4983 goto next;
6ba1e6e8 4984 err = inet6_fill_ifaddr(skb, ifa, fillargs);
053c095a 4985 if (err < 0)
234b27c3 4986 break;
63998ac2 4987 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4ba4c566
DA		 4988next:
4989 ip_idx++;
234b27c3
ED		 4990 }
4991 break;
502a2ffd 4992 }
234b27c3 4993 case MULTICAST_ADDR:
6ba1e6e8 4994 fillargs->event = RTM_GETMULTICAST;
203651b6 4995
234b27c3
ED		 4996 /* multicast address */
4997 for (ifmca = idev->mc_list; ifmca;
4998 ifmca = ifmca->next, ip_idx++) {
4999 if (ip_idx < s_ip_idx)
5000 continue;
6ba1e6e8 5001 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
053c095a 5002 if (err < 0)
234b27c3
ED		 5003 break;
5004 }
5005 break;
5006 case ANYCAST_ADDR:
6ba1e6e8 5007 fillargs->event = RTM_GETANYCAST;
234b27c3
ED		 5008 /* anycast address */
5009 for (ifaca = idev->ac_list; ifaca;
5010 ifaca = ifaca->aca_next, ip_idx++) {
5011 if (ip_idx < s_ip_idx)
5012 continue;
6ba1e6e8 5013 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
053c095a 5014 if (err < 0)
234b27c3
ED		 5015 break;
5016 }
5017 break;
5018 default:
5019 break;
5020 }
5021 read_unlock_bh(&idev->lock);
fe884c2b 5022 cb->args[2] = ip_idx;
234b27c3
ED		 5023 return err;
5024}
5025
ed6eff11
DA		 5026static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5027 struct inet6_fill_args *fillargs,
5028 struct net **tgt_net, struct sock *sk,
6371a71f 5029 struct netlink_callback *cb)
ed6eff11 5030{
6371a71f 5031 struct netlink_ext_ack *extack = cb->extack;
ed6eff11
DA		 5032 struct nlattr *tb[IFA_MAX+1];
5033 struct ifaddrmsg *ifm;
5034 int err, i;
5035
5036 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5037 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5038 return -EINVAL;
5039 }
5040
5041 ifm = nlmsg_data(nlh);
5042 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5043 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5044 return -EINVAL;
5045 }
6371a71f
DA		 5046
5047 fillargs->ifindex = ifm->ifa_index;
5048 if (fillargs->ifindex) {
5049 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5050 fillargs->flags |= NLM_F_DUMP_FILTERED;
ed6eff11
DA		 5051 }
5052
5053 err = nlmsg_parse_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5054 ifa_ipv6_policy, extack);
5055 if (err < 0)
5056 return err;
5057
5058 for (i = 0; i <= IFA_MAX; ++i) {
5059 if (!tb[i])
5060 continue;
5061
5062 if (i == IFA_TARGET_NETNSID) {
5063 struct net *net;
5064
5065 fillargs->netnsid = nla_get_s32(tb[i]);
5066 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5067 if (IS_ERR(net)) {
bf4cc40e 5068 fillargs->netnsid = -1;
ed6eff11
DA		 5069 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5070 return PTR_ERR(net);
5071 }
5072 *tgt_net = net;
5073 } else {
5074 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5075 return -EINVAL;
5076 }
5077 }
5078
5079 return 0;
5080}
5081
1da177e4
LT		 5082static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5083 enum addr_type_t type)
5084{
ed6eff11 5085 const struct nlmsghdr *nlh = cb->nlh;
6ba1e6e8
DA		 5086 struct inet6_fill_args fillargs = {
5087 .portid = NETLINK_CB(cb->skb).portid,
5088 .seq = cb->nlh->nlmsg_seq,
5089 .flags = NLM_F_MULTI,
5090 .netnsid = -1,
5091 .type = type,
5092 };
234b27c3 5093 struct net *net = sock_net(skb->sk);
6ecf4c37 5094 struct net *tgt_net = net;
fe884c2b 5095 int idx, s_idx, s_ip_idx;
234b27c3 5096 int h, s_h;
1da177e4 5097 struct net_device *dev;
234b27c3
ED		 5098 struct inet6_dev *idev;
5099 struct hlist_head *head;
242afaa6 5100 int err = 0;
1ab1457c 5101
234b27c3
ED		 5102 s_h = cb->args[0];
5103 s_idx = idx = cb->args[1];
fe884c2b 5104 s_ip_idx = cb->args[2];
5d5619b4 5105
ed6eff11 5106 if (cb->strict_check) {
ed6eff11 5107 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
6371a71f 5108 skb->sk, cb);
ed6eff11 5109 if (err < 0)
242afaa6 5110 goto put_tgt_net;
6371a71f 5111
242afaa6 5112 err = 0;
6371a71f
DA		 5113 if (fillargs.ifindex) {
5114 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
242afaa6
DA		 5115 if (!dev) {
5116 err = -ENODEV;
5117 goto put_tgt_net;
5118 }
6371a71f
DA		 5119 idev = __in6_dev_get(dev);
5120 if (idev) {
5121 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5122 &fillargs);
5123 }
5124 goto put_tgt_net;
5125 }
6ecf4c37
CB		 5126 }
5127
234b27c3 5128 rcu_read_lock();
6ecf4c37 5129 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
234b27c3
ED		 5130 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5131 idx = 0;
6ecf4c37 5132 head = &tgt_net->dev_index_head[h];
b67bfe0d 5133 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 5134 if (idx < s_idx)
5135 goto cont;
4b97efdf 5136 if (h > s_h || idx > s_idx)
234b27c3 5137 s_ip_idx = 0;
e21e8467
SH		 5138 idev = __in6_dev_get(dev);
5139 if (!idev)
234b27c3
ED		 5140 goto cont;
5141
fe884c2b 5142 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
6ba1e6e8 5143 &fillargs) < 0)
234b27c3 5144 goto done;
7562f876 5145cont:
234b27c3
ED		 5146 idx++;
5147 }
1da177e4 5148 }
234b27c3
ED		 5149done:
5150 rcu_read_unlock();
5151 cb->args[0] = h;
5152 cb->args[1] = idx;
6371a71f 5153put_tgt_net:
6ba1e6e8 5154 if (fillargs.netnsid >= 0)
6ecf4c37 5155 put_net(tgt_net);
234b27c3 5156
242afaa6 5157 return err < 0 ? err : skb->len;
1da177e4
LT		 5158}
5159
5160static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5161{
5162 enum addr_type_t type = UNICAST_ADDR;
b854272b 5163
1da177e4
LT		 5164 return inet6_dump_addr(skb, cb, type);
5165}
5166
5167static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5168{
5169 enum addr_type_t type = MULTICAST_ADDR;
b854272b 5170
1da177e4
LT		 5171 return inet6_dump_addr(skb, cb, type);
5172}
5173
5174
5175static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5176{
5177 enum addr_type_t type = ANYCAST_ADDR;
b854272b 5178
1da177e4
LT		 5179 return inet6_dump_addr(skb, cb, type);
5180}
5181
c21ef3e3
DA		 5182static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5183 struct netlink_ext_ack *extack)
6c223828 5184{
3b1e0a65 5185 struct net *net = sock_net(in_skb->sk);
203651b6
CB		 5186 struct inet6_fill_args fillargs = {
5187 .portid = NETLINK_CB(in_skb).portid,
5188 .seq = nlh->nlmsg_seq,
5189 .event = RTM_NEWADDR,
5190 .flags = 0,
5191 .netnsid = -1,
5192 };
6ecf4c37 5193 struct net *tgt_net = net;
1b29fc2c
TG		 5194 struct ifaddrmsg *ifm;
5195 struct nlattr *tb[IFA_MAX+1];
caeaba79 5196 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 5197 struct net_device *dev = NULL;
5198 struct inet6_ifaddr *ifa;
5199 struct sk_buff *skb;
6c223828
NT		 5200 int err;
5201
fceb6435 5202 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 5203 extack);
1b29fc2c 5204 if (err < 0)
c24675f8 5205 return err;
1b29fc2c 5206
6ecf4c37 5207 if (tb[IFA_TARGET_NETNSID]) {
203651b6 5208 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
6ecf4c37
CB		 5209
5210 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
203651b6 5211 fillargs.netnsid);
6ecf4c37
CB		 5212 if (IS_ERR(tgt_net))
5213 return PTR_ERR(tgt_net);
5214 }
5215
caeaba79 5216 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
c24675f8
FW		 5217 if (!addr)
5218 return -EINVAL;
6c223828 5219
1b29fc2c 5220 ifm = nlmsg_data(nlh);
6c223828 5221 if (ifm->ifa_index)
6ecf4c37 5222 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
6c223828 5223
6ecf4c37 5224 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
e21e8467 5225 if (!ifa) {
1b29fc2c
TG		 5226 err = -EADDRNOTAVAIL;
5227 goto errout;
5228 }
6c223828 5229
e21e8467
SH		 5230 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5231 if (!skb) {
6c223828 5232 err = -ENOBUFS;
1b29fc2c 5233 goto errout_ifa;
6c223828
NT		 5234 }
5235
203651b6 5236 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
26932566
PM		 5237 if (err < 0) {
5238 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5239 WARN_ON(err == -EMSGSIZE);
5240 kfree_skb(skb);
5241 goto errout_ifa;
5242 }
6ecf4c37 5243 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
1b29fc2c 5244errout_ifa:
6c223828 5245 in6_ifa_put(ifa);
1b29fc2c 5246errout:
c24675f8
FW		 5247 if (dev)
5248 dev_put(dev);
203651b6 5249 if (fillargs.netnsid >= 0)
6ecf4c37
CB		 5250 put_net(tgt_net);
5251
6c223828 5252 return err;
6c223828
NT		 5253}
5254
1da177e4
LT		 5255static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5256{
5257 struct sk_buff *skb;
c346dca1 5258 struct net *net = dev_net(ifa->idev->dev);
203651b6
CB		 5259 struct inet6_fill_args fillargs = {
5260 .portid = 0,
5261 .seq = 0,
5262 .event = event,
5263 .flags = 0,
5264 .netnsid = -1,
5265 };
5d620266 5266 int err = -ENOBUFS;
1da177e4 5267
0ab6803b 5268 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 5269 if (!skb)
5d620266
TG		 5270 goto errout;
5271
203651b6 5272 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
26932566
PM		 5273 if (err < 0) {
5274 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5275 WARN_ON(err == -EMSGSIZE);
5276 kfree_skb(skb);
5277 goto errout;
5278 }
1ce85fe4
PNA		 5279 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5280 return;
5d620266
TG		 5281errout:
5282 if (err < 0)
6fda7350 5283 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 5284}
5285
b6f99a21 5286static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 5287 __s32 *array, int bytes)
5288{
04561c1f
TG		 5289 BUG_ON(bytes < (DEVCONF_MAX * 4));
5290
1da177e4
LT		 5291 memset(array, 0, bytes);
5292 array[DEVCONF_FORWARDING] = cnf->forwarding;
5293 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5294 array[DEVCONF_MTU6] = cnf->mtu6;
5295 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5296 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5297 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5298 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5299 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 5300 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5301 jiffies_to_msecs(cnf->rtr_solicit_interval);
bd11f074
MŻ		 5302 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5303 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
93908d19
TG		 5304 array[DEVCONF_RTR_SOLICIT_DELAY] =
5305 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 5306 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 5307 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5308 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5309 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5310 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 5311 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5312 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5313 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5314 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5315 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 5316 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 5317 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 5318 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 5319 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 5320#ifdef CONFIG_IPV6_ROUTER_PREF
5321 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 5322 array[DEVCONF_RTR_PROBE_INTERVAL] =
5323 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 5324#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 5325 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
09c884d4
YH		 5326 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5327#endif
930d6ff2 5328#endif
fbea49e1 5329 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 5330 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 5331#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5332 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 5333 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 5334#endif
7bc570c8
YH		 5335#ifdef CONFIG_IPV6_MROUTE
5336 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5337#endif
778d80be 5338 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 5339 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 5340 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 5341 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 5342 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 5343 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 5344 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 5345 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 5346 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 5347 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 5348 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 5349 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 5350 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1ababeba 5351 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
bf355b8d
DL		 5352#ifdef CONFIG_IPV6_SEG6_HMAC
5353 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5354#endif
adc176c5 5355 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
d35a00b8 5356 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
df789fe7 5357 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
2210d6b2 5358 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
1da177e4
LT		 5359}
5360
b382b191
TG		 5361static inline size_t inet6_ifla6_size(void)
5362{
5363 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5364 + nla_total_size(sizeof(struct ifla_cacheinfo))
5365 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5366 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4 5367 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
bdd72f41
SD		 5368 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5369 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5370 + 0;
b382b191
TG		 5371}
5372
339bf98f
TG		 5373static inline size_t inet6_if_nlmsg_size(void)
5374{
5375 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5376 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5377 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5378 + nla_total_size(4) /* IFLA_MTU */
5379 + nla_total_size(4) /* IFLA_LINK */
0344338b 5380 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 5381 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 5382}
c5396a31 5383
be281e55 5384static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
aca05671 5385 int bytes)
7f7d9a6b
HX		 5386{
5387 int i;
aca05671 5388 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
7f7d9a6b
HX		 5389 BUG_ON(pad < 0);
5390
5391 /* Use put_unaligned() because stats may not be aligned for u64. */
aca05671
JH		 5392 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5393 for (i = 1; i < ICMP6_MIB_MAX; i++)
be281e55 5394 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b 5395
aca05671 5396 memset(&stats[ICMP6_MIB_MAX], 0, pad);
7f7d9a6b
HX		 5397}
5398
698365fa 5399static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 5400 int bytes, size_t syncpoff)
4ce3c183 5401{
a3a77372
R		 5402 int i, c;
5403 u64 buff[IPSTATS_MIB_MAX];
5404 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5405
4ce3c183
ED		 5406 BUG_ON(pad < 0);
5407
a3a77372
R		 5408 memset(buff, 0, sizeof(buff));
5409 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 5410
a3a77372
R		 5411 for_each_possible_cpu(c) {
5412 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5413 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5414 }
5415
5416 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5417 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 5418}
5419
7f7d9a6b
HX		 5420static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5421 int bytes)
5422{
e21e8467 5423 switch (attrtype) {
7f7d9a6b 5424 case IFLA_INET6_STATS:
a3a77372
R		 5425 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5426 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 5427 break;
5428 case IFLA_INET6_ICMP6STATS:
aca05671 5429 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
7f7d9a6b
HX		 5430 break;
5431 }
5432}
5433
d5566fd7
SV		 5434static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5435 u32 ext_filter_mask)
b382b191
TG		 5436{
5437 struct nlattr *nla;
5438 struct ifla_cacheinfo ci;
5439
c78679e8
DM		 5440 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5441 goto nla_put_failure;
b382b191 5442 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 5443 ci.tstamp = cstamp_delta(idev->tstamp);
5444 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 5445 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 5446 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5447 goto nla_put_failure;
b382b191 5448 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 5449 if (!nla)
b382b191
TG		 5450 goto nla_put_failure;
5451 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5452
5453 /* XXX - MC not implemented */
5454
d5566fd7
SV		 5455 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5456 return 0;
5457
b382b191 5458 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 5459 if (!nla)
b382b191
TG		 5460 goto nla_put_failure;
5461 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5462
5463 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 5464 if (!nla)
b382b191
TG		 5465 goto nla_put_failure;
5466 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5467
f53adae4 5468 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 5469 if (!nla)
f53adae4 5470 goto nla_put_failure;
bc91b0f0 5471
d35a00b8 5472 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
bc91b0f0
JP		 5473 goto nla_put_failure;
5474
f53adae4
DB		 5475 read_lock_bh(&idev->lock);
5476 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5477 read_unlock_bh(&idev->lock);
5478
b382b191
TG		 5479 return 0;
5480
5481nla_put_failure:
5482 return -EMSGSIZE;
5483}
5484
b1974ed0
AR		 5485static size_t inet6_get_link_af_size(const struct net_device *dev,
5486 u32 ext_filter_mask)
b382b191
TG		 5487{
5488 if (!__in6_dev_get(dev))
5489 return 0;
5490
5491 return inet6_ifla6_size();
5492}
5493
d5566fd7
SV		 5494static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5495 u32 ext_filter_mask)
b382b191
TG		 5496{
5497 struct inet6_dev *idev = __in6_dev_get(dev);
5498
5499 if (!idev)
5500 return -ENODATA;
5501
d5566fd7 5502 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5503 return -EMSGSIZE;
5504
5505 return 0;
5506}
5507
f53adae4
DB		 5508static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5509{
f53adae4
DB		 5510 struct inet6_ifaddr *ifp;
5511 struct net_device *dev = idev->dev;
47e27d5e 5512 bool clear_token, update_rs = false;
dc848292 5513 struct in6_addr ll_addr;
f53adae4 5514
c15b1cca
HFS		 5515 ASSERT_RTNL();
5516
63159f29 5517 if (!token)
f53adae4 5518 return -EINVAL;
f53adae4
DB		 5519 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5520 return -EINVAL;
f53adae4
DB		 5521 if (!ipv6_accept_ra(idev))
5522 return -EINVAL;
bd11f074 5523 if (idev->cnf.rtr_solicits == 0)
f53adae4
DB		 5524 return -EINVAL;
5525
5526 write_lock_bh(&idev->lock);
5527
5528 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5529 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5530
5531 write_unlock_bh(&idev->lock);
5532
47e27d5e
DB		 5533 clear_token = ipv6_addr_any(token);
5534 if (clear_token)
5535 goto update_lft;
5536
dc848292
HFS		 5537 if (!idev->dead && (idev->if_flags & IF_READY) &&
5538 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5539 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5540 /* If we're not ready, then normal ifup will take care
5541 * of this. Otherwise, we need to request our rs here.
5542 */
5543 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5544 update_rs = true;
5545 }
f53adae4 5546
47e27d5e 5547update_lft:
f53adae4 5548 write_lock_bh(&idev->lock);
fc403832 5549
77ecaace 5550 if (update_rs) {
fc403832 5551 idev->if_flags |= IF_RS_SENT;
bd11f074
MŻ		 5552 idev->rs_interval = rfc3315_s14_backoff_init(
5553 idev->cnf.rtr_solicit_interval);
77ecaace 5554 idev->rs_probes = 1;
bd11f074 5555 addrconf_mod_rs_timer(idev, idev->rs_interval);
77ecaace 5556 }
f53adae4
DB		 5557
5558 /* Well, that's kinda nasty ... */
5559 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5560 spin_lock(&ifp->lock);
617fe29d 5561 if (ifp->tokenized) {
f53adae4
DB		 5562 ifp->valid_lft = 0;
5563 ifp->prefered_lft = 0;
5564 }
5565 spin_unlock(&ifp->lock);
5566 }
5567
5568 write_unlock_bh(&idev->lock);
b2ed64a9 5569 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 5570 addrconf_verify_rtnl();
f53adae4
DB		 5571 return 0;
5572}
5573
11b1f828
DB		 5574static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5575 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5576 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5577};
5578
5579static int inet6_validate_link_af(const struct net_device *dev,
5580 const struct nlattr *nla)
5581{
5582 struct nlattr *tb[IFLA_INET6_MAX + 1];
5583
5584 if (dev && !__in6_dev_get(dev))
5585 return -EAFNOSUPPORT;
5586
fceb6435
JB		 5587 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5588 NULL);
11b1f828
DB		 5589}
5590
d35a00b8
FJ		 5591static int check_addr_gen_mode(int mode)
5592{
5593 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5594 mode != IN6_ADDR_GEN_MODE_NONE &&
5595 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5596 mode != IN6_ADDR_GEN_MODE_RANDOM)
5597 return -EINVAL;
5598 return 1;
5599}
5600
5601static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5602 int mode)
5603{
5604 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5605 !idev->cnf.stable_secret.initialized &&
5606 !net->ipv6.devconf_dflt->stable_secret.initialized)
5607 return -EINVAL;
5608 return 1;
5609}
5610
f53adae4
DB		 5611static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5612{
5613 int err = -EINVAL;
5614 struct inet6_dev *idev = __in6_dev_get(dev);
5615 struct nlattr *tb[IFLA_INET6_MAX + 1];
5616
5617 if (!idev)
5618 return -EAFNOSUPPORT;
5619
fceb6435 5620 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
f53adae4
DB		 5621 BUG();
5622
bc91b0f0 5623 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 5624 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 5625 if (err)
5626 return err;
5627 }
5628
5629 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5630 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5631
d35a00b8
FJ		 5632 if (check_addr_gen_mode(mode) < 0 ||
5633 check_stable_privacy(idev, dev_net(dev), mode) < 0)
bc91b0f0 5634 return -EINVAL;
622c81d5 5635
d35a00b8 5636 idev->cnf.addr_gen_mode = mode;
bc91b0f0
JP		 5637 err = 0;
5638 }
f53adae4
DB		 5639
5640 return err;
5641}
5642
1ab1457c 5643static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5644 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5645{
04561c1f 5646 struct net_device *dev = idev->dev;
04561c1f
TG		 5647 struct ifinfomsg *hdr;
5648 struct nlmsghdr *nlh;
5649 void *protoinfo;
04561c1f 5650
15e47304 5651 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5652 if (!nlh)
26932566 5653 return -EMSGSIZE;
04561c1f
TG		 5654
5655 hdr = nlmsg_data(nlh);
5656 hdr->ifi_family = AF_INET6;
5657 hdr->__ifi_pad = 0;
5658 hdr->ifi_type = dev->type;
5659 hdr->ifi_index = dev->ifindex;
5660 hdr->ifi_flags = dev_get_flags(dev);
5661 hdr->ifi_change = 0;
5662
c78679e8
DM		 5663 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5664 (dev->addr_len &&
5665 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5666 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5667 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5668 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5669 nla_put_u8(skb, IFLA_OPERSTATE,
5670 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5671 goto nla_put_failure;
04561c1f 5672 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 5673 if (!protoinfo)
04561c1f 5674 goto nla_put_failure;
1da177e4 5675
d5566fd7 5676 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5677 goto nla_put_failure;
1da177e4 5678
04561c1f 5679 nla_nest_end(skb, protoinfo);
053c095a
JB		 5680 nlmsg_end(skb, nlh);
5681 return 0;
1da177e4 5682
04561c1f 5683nla_put_failure:
26932566
PM		 5684 nlmsg_cancel(skb, nlh);
5685 return -EMSGSIZE;
1da177e4
LT		 5686}
5687
786e0007
DA		 5688static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5689 struct netlink_ext_ack *extack)
5690{
5691 struct ifinfomsg *ifm;
5692
5693 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5694 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5695 return -EINVAL;
5696 }
5697
5698 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5699 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5700 return -EINVAL;
5701 }
5702
5703 ifm = nlmsg_data(nlh);
5704 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5705 ifm->ifi_change || ifm->ifi_index) {
5706 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5707 return -EINVAL;
5708 }
5709
5710 return 0;
5711}
5712
1da177e4
LT		 5713static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5714{
3b1e0a65 5715 struct net *net = sock_net(skb->sk);
84d2697d 5716 int h, s_h;
434a8a58 5717 int idx = 0, s_idx;
1da177e4
LT		 5718 struct net_device *dev;
5719 struct inet6_dev *idev;
84d2697d 5720 struct hlist_head *head;
1da177e4 5721
786e0007
DA		 5722 /* only requests using strict checking can pass data to
5723 * influence the dump
5724 */
5725 if (cb->strict_check) {
5726 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
5727
5728 if (err < 0)
5729 return err;
5730 }
5731
84d2697d
ED		 5732 s_h = cb->args[0];
5733 s_idx = cb->args[1];
5734
5735 rcu_read_lock();
5736 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5737 idx = 0;
5738 head = &net->dev_index_head[h];
b67bfe0d 5739 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5740 if (idx < s_idx)
5741 goto cont;
5742 idev = __in6_dev_get(dev);
5743 if (!idev)
5744 goto cont;
5745 if (inet6_fill_ifinfo(skb, idev,
15e47304 5746 NETLINK_CB(cb->skb).portid,
84d2697d 5747 cb->nlh->nlmsg_seq,
053c095a 5748 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5749 goto out;
7562f876 5750cont:
84d2697d
ED		 5751 idx++;
5752 }
1da177e4 5753 }
84d2697d
ED		 5754out:
5755 rcu_read_unlock();
5756 cb->args[1] = idx;
5757 cb->args[0] = h;
1da177e4
LT		 5758
5759 return skb->len;
5760}
5761
5762void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5763{
5764 struct sk_buff *skb;
c346dca1 5765 struct net *net = dev_net(idev->dev);
8d7a76c9 5766 int err = -ENOBUFS;
1ab1457c 5767
339bf98f 5768 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5769 if (!skb)
8d7a76c9
TG		 5770 goto errout;
5771
5772 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5773 if (err < 0) {
5774 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5775 WARN_ON(err == -EMSGSIZE);
5776 kfree_skb(skb);
5777 goto errout;
5778 }
5f75a104 5779 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5780 return;
8d7a76c9
TG		 5781errout:
5782 if (err < 0)
5f75a104 5783 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5784}
5785
339bf98f
TG		 5786static inline size_t inet6_prefix_nlmsg_size(void)
5787{
5788 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5789 + nla_total_size(sizeof(struct in6_addr))
5790 + nla_total_size(sizeof(struct prefix_cacheinfo));
5791}
c5396a31 5792
1da177e4 5793static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5794 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5795 int event, unsigned int flags)
1da177e4 5796{
6051e2f4
TG		 5797 struct prefixmsg *pmsg;
5798 struct nlmsghdr *nlh;
1da177e4
LT		 5799 struct prefix_cacheinfo ci;
5800
15e47304 5801 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5802 if (!nlh)
26932566 5803 return -EMSGSIZE;
6051e2f4
TG		 5804
5805 pmsg = nlmsg_data(nlh);
1da177e4 5806 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5807 pmsg->prefix_pad1 = 0;
5808 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5809 pmsg->prefix_ifindex = idev->dev->ifindex;
5810 pmsg->prefix_len = pinfo->prefix_len;
5811 pmsg->prefix_type = pinfo->type;
8a47077a 5812 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5813 pmsg->prefix_flags = 0;
5814 if (pinfo->onlink)
5815 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5816 if (pinfo->autoconf)
5817 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5818
c78679e8
DM		 5819 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5820 goto nla_put_failure;
1da177e4
LT		 5821 ci.preferred_time = ntohl(pinfo->prefered);
5822 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5823 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5824 goto nla_put_failure;
053c095a
JB		 5825 nlmsg_end(skb, nlh);
5826 return 0;
1da177e4 5827
6051e2f4 5828nla_put_failure:
26932566
PM		 5829 nlmsg_cancel(skb, nlh);
5830 return -EMSGSIZE;
1da177e4
LT		 5831}
5832
1ab1457c 5833static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5834 struct prefix_info *pinfo)
5835{
5836 struct sk_buff *skb;
c346dca1 5837 struct net *net = dev_net(idev->dev);
8c384bfa 5838 int err = -ENOBUFS;
1da177e4 5839
339bf98f 5840 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5841 if (!skb)
8c384bfa
TG		 5842 goto errout;
5843
5844 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5845 if (err < 0) {
5846 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5847 WARN_ON(err == -EMSGSIZE);
5848 kfree_skb(skb);
5849 goto errout;
5850 }
1ce85fe4
PNA		 5851 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5852 return;
8c384bfa
TG		 5853errout:
5854 if (err < 0)
6fda7350 5855 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5856}
5857
1da177e4
LT		 5858static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5859{
63998ac2
ND		 5860 struct net *net = dev_net(ifp->idev->dev);
5861
c15b1cca
HFS		 5862 if (event)
5863 ASSERT_RTNL();
5864
1da177e4
LT		 5865 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5866
5867 switch (event) {
5868 case RTM_NEWADDR:
95c385b4
NH		 5869 /*
5870 * If the address was optimistic
5871 * we inserted the route at the start of
5872 * our DAD process, so we don't need
5873 * to do it again
5874 */
93c2fb25 5875 if (!rcu_access_pointer(ifp->rt->fib6_node))
afb1d4b5 5876 ip6_ins_rt(net, ifp->rt);
1da177e4
LT		 5877 if (ifp->idev->cnf.forwarding)
5878 addrconf_join_anycast(ifp);
7996c799 5879 if (!ipv6_addr_any(&ifp->peer_addr))
8308f3ff 5880 addrconf_prefix_route(&ifp->peer_addr, 128, 0,
acb54e3c 5881 ifp->idev->dev, 0, 0,
27b10608 5882 GFP_ATOMIC);
1da177e4
LT		 5883 break;
5884 case RTM_DELADDR:
5885 if (ifp->idev->cnf.forwarding)
5886 addrconf_leave_anycast(ifp);
5887 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5888 if (!ipv6_addr_any(&ifp->peer_addr)) {
8d1c802b 5889 struct fib6_info *rt;
caeaba79 5890
e7478dfc
ND		 5891 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5892 ifp->idev->dev, 0, 0);
8e3d5be7 5893 if (rt)
afb1d4b5 5894 ip6_del_rt(net, rt);
caeaba79 5895 }
38bd10c4 5896 if (ifp->rt) {
93531c67
DA		 5897 ip6_del_rt(net, ifp->rt);
5898 ifp->rt = NULL;
38bd10c4 5899 }
705f1c86 5900 rt_genid_bump_ipv6(net);
1da177e4
LT		 5901 break;
5902 }
63998ac2 5903 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5904}
5905
5906static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5907{
8814c4b5 5908 rcu_read_lock_bh();
1da177e4
LT		 5909 if (likely(ifp->idev->dead == 0))
5910 __ipv6_ifa_notify(event, ifp);
8814c4b5 5911 rcu_read_unlock_bh();
1da177e4
LT		 5912}
5913
5914#ifdef CONFIG_SYSCTL
5915
5916static
fe2c6338 5917int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5918 void __user *buffer, size_t *lenp, loff_t *ppos)
5919{
5920 int *valp = ctl->data;
5921 int val = *valp;
88af182e 5922 loff_t pos = *ppos;
fe2c6338 5923 struct ctl_table lctl;
1da177e4
LT		 5924 int ret;
5925
013d97e9
FR		 5926 /*
5927 * ctl->data points to idev->cnf.forwarding, we should
5928 * not modify it until we get the rtnl lock.
5929 */
5930 lctl = *ctl;
5931 lctl.data = &val;
5932
5933 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5934
c8fecf22 5935 if (write)
b325fddb 5936 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5937 if (ret)
5938 *ppos = pos;
1ab1457c 5939 return ret;
1da177e4
LT		 5940}
5941
77751427
ML		 5942static
5943int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5944 void __user *buffer, size_t *lenp, loff_t *ppos)
5945{
5946 struct inet6_dev *idev = ctl->extra1;
5947 int min_mtu = IPV6_MIN_MTU;
5948 struct ctl_table lctl;
5949
5950 lctl = *ctl;
5951 lctl.extra1 = &min_mtu;
5952 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5953
5954 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5955}
5956
56d417b1
BH		 5957static void dev_disable_change(struct inet6_dev *idev)
5958{
75538c2b
CW		 5959 struct netdev_notifier_info info;
5960
56d417b1
BH		 5961 if (!idev || !idev->dev)
5962 return;
5963
75538c2b 5964 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5965 if (idev->cnf.disable_ipv6)
75538c2b 5966 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5967 else
75538c2b 5968 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5969}
5970
5971static void addrconf_disable_change(struct net *net, __s32 newf)
5972{
5973 struct net_device *dev;
5974 struct inet6_dev *idev;
5975
03e4deff 5976 for_each_netdev(net, dev) {
56d417b1
BH		 5977 idev = __in6_dev_get(dev);
5978 if (idev) {
5979 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5980 idev->cnf.disable_ipv6 = newf;
5981 if (changed)
5982 dev_disable_change(idev);
5983 }
56d417b1 5984 }
56d417b1
BH		 5985}
5986
013d97e9 5987static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5988{
5989 struct net *net;
013d97e9
FR		 5990 int old;
5991
5992 if (!rtnl_trylock())
5993 return restart_syscall();
56d417b1
BH		 5994
5995 net = (struct net *)table->extra2;
013d97e9
FR		 5996 old = *p;
5997 *p = newf;
56d417b1 5998
013d97e9
FR		 5999 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6000 rtnl_unlock();
56d417b1 6001 return 0;
88af182e 6002 }
56d417b1
BH		 6003
6004 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 6005 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6006 addrconf_disable_change(net, newf);
013d97e9 6007 } else if ((!newf) ^ (!old))
56d417b1
BH		 6008 dev_disable_change((struct inet6_dev *)table->extra1);
6009
6010 rtnl_unlock();
6011 return 0;
6012}
6013
6014static
fe2c6338 6015int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 6016 void __user *buffer, size_t *lenp, loff_t *ppos)
6017{
6018 int *valp = ctl->data;
6019 int val = *valp;
88af182e 6020 loff_t pos = *ppos;
fe2c6338 6021 struct ctl_table lctl;
56d417b1
BH		 6022 int ret;
6023
013d97e9
FR		 6024 /*
6025 * ctl->data points to idev->cnf.disable_ipv6, we should
6026 * not modify it until we get the rtnl lock.
6027 */
6028 lctl = *ctl;
6029 lctl.data = &val;
6030
6031 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 6032
6033 if (write)
6034 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 6035 if (ret)
6036 *ppos = pos;
56d417b1
BH		 6037 return ret;
6038}
6039
c92d5491 6040static
6041int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6042 void __user *buffer, size_t *lenp, loff_t *ppos)
6043{
6044 int *valp = ctl->data;
6045 int ret;
6046 int old, new;
6047
6048 old = *valp;
6049 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6050 new = *valp;
6051
6052 if (write && old != new) {
6053 struct net *net = ctl->extra2;
6054
6055 if (!rtnl_trylock())
6056 return restart_syscall();
6057
6058 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
85b3daad
DA		 6059 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6060 NETCONFA_PROXY_NEIGH,
c92d5491 6061 NETCONFA_IFINDEX_DEFAULT,
6062 net->ipv6.devconf_dflt);
6063 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
85b3daad
DA		 6064 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6065 NETCONFA_PROXY_NEIGH,
c92d5491 6066 NETCONFA_IFINDEX_ALL,
6067 net->ipv6.devconf_all);
6068 else {
6069 struct inet6_dev *idev = ctl->extra1;
6070
85b3daad
DA		 6071 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6072 NETCONFA_PROXY_NEIGH,
c92d5491 6073 idev->dev->ifindex,
6074 &idev->cnf);
6075 }
6076 rtnl_unlock();
6077 }
6078
6079 return ret;
6080}
6081
d35a00b8
FJ		 6082static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6083 void __user *buffer, size_t *lenp,
6084 loff_t *ppos)
6085{
6086 int ret = 0;
c6dbf7aa 6087 u32 new_val;
d35a00b8
FJ		 6088 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6089 struct net *net = (struct net *)ctl->extra2;
c6dbf7aa
SD		 6090 struct ctl_table tmp = {
6091 .data = &new_val,
6092 .maxlen = sizeof(new_val),
6093 .mode = ctl->mode,
6094 };
d35a00b8 6095
8c171d6c
FJ		 6096 if (!rtnl_trylock())
6097 return restart_syscall();
6098
c6dbf7aa 6099 new_val = *((u32 *)ctl->data);
d35a00b8 6100
c6dbf7aa
SD		 6101 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6102 if (ret != 0)
6103 goto out;
d35a00b8 6104
c6dbf7aa 6105 if (write) {
8c171d6c
FJ		 6106 if (check_addr_gen_mode(new_val) < 0) {
6107 ret = -EINVAL;
6108 goto out;
6109 }
d35a00b8 6110
c6dbf7aa 6111 if (idev) {
8c171d6c
FJ		 6112 if (check_stable_privacy(idev, net, new_val) < 0) {
6113 ret = -EINVAL;
6114 goto out;
6115 }
d35a00b8
FJ		 6116
6117 if (idev->cnf.addr_gen_mode != new_val) {
6118 idev->cnf.addr_gen_mode = new_val;
d35a00b8 6119 addrconf_dev_config(idev->dev);
d35a00b8 6120 }
f24c5987
SD		 6121 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6122 struct net_device *dev;
6123
6124 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6125 for_each_netdev(net, dev) {
6126 idev = __in6_dev_get(dev);
6127 if (idev &&
6128 idev->cnf.addr_gen_mode != new_val) {
6129 idev->cnf.addr_gen_mode = new_val;
6130 addrconf_dev_config(idev->dev);
6131 }
6132 }
d35a00b8 6133 }
c6dbf7aa
SD		 6134
6135 *((u32 *)ctl->data) = new_val;
d35a00b8
FJ		 6136 }
6137
8c171d6c
FJ		 6138out:
6139 rtnl_unlock();
6140
d35a00b8
FJ		 6141 return ret;
6142}
6143
3d1bec99
HFS		 6144static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6145 void __user *buffer, size_t *lenp,
6146 loff_t *ppos)
6147{
6148 int err;
6149 struct in6_addr addr;
6150 char str[IPV6_MAX_STRLEN];
6151 struct ctl_table lctl = *ctl;
622c81d5 6152 struct net *net = ctl->extra2;
3d1bec99
HFS		 6153 struct ipv6_stable_secret *secret = ctl->data;
6154
622c81d5
HFS		 6155 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6156 return -EIO;
6157
3d1bec99
HFS		 6158 lctl.maxlen = IPV6_MAX_STRLEN;
6159 lctl.data = str;
6160
6161 if (!rtnl_trylock())
6162 return restart_syscall();
6163
6164 if (!write && !secret->initialized) {
6165 err = -EIO;
6166 goto out;
6167 }
6168
5449a5ca
WC		 6169 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6170 if (err >= sizeof(str)) {
6171 err = -EIO;
6172 goto out;
3d1bec99
HFS		 6173 }
6174
6175 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6176 if (err || !write)
6177 goto out;
6178
6179 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6180 err = -EIO;
6181 goto out;
6182 }
6183
6184 secret->initialized = true;
6185 secret->secret = addr;
6186
622c81d5
HFS		 6187 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6188 struct net_device *dev;
6189
6190 for_each_netdev(net, dev) {
6191 struct inet6_dev *idev = __in6_dev_get(dev);
6192
6193 if (idev) {
d35a00b8 6194 idev->cnf.addr_gen_mode =
622c81d5
HFS		 6195 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6196 }
6197 }
6198 } else {
6199 struct inet6_dev *idev = ctl->extra1;
6200
d35a00b8 6201 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
622c81d5
HFS		 6202 }
6203
3d1bec99
HFS		 6204out:
6205 rtnl_unlock();
6206
6207 return err;
6208}
c92d5491 6209
35103d11
AG		 6210static
6211int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6212 int write,
6213 void __user *buffer,
6214 size_t *lenp,
6215 loff_t *ppos)
6216{
6217 int *valp = ctl->data;
6218 int val = *valp;
6219 loff_t pos = *ppos;
6220 struct ctl_table lctl;
6221 int ret;
6222
6223 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6224 * we should not modify it until we get the rtnl lock.
6225 */
6226 lctl = *ctl;
6227 lctl.data = &val;
6228
6229 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6230
6231 if (write)
6232 ret = addrconf_fixup_linkdown(ctl, valp, val);
6233 if (ret)
6234 *ppos = pos;
6235 return ret;
6236}
6237
df789fe7
DF		 6238static
6239void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6240{
6241 if (rt) {
6242 if (action)
6243 rt->dst.flags |= DST_NOPOLICY;
6244 else
6245 rt->dst.flags &= ~DST_NOPOLICY;
6246 }
6247}
6248
6249static
6250void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6251{
6252 struct inet6_ifaddr *ifa;
6253
6254 read_lock_bh(&idev->lock);
6255 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6256 spin_lock(&ifa->lock);
6257 if (ifa->rt) {
8d1c802b 6258 struct fib6_info *rt = ifa->rt;
df789fe7
DF		 6259 int cpu;
6260
66f5d6ce 6261 rcu_read_lock();
3b6761d1 6262 ifa->rt->dst_nopolicy = val ? true : false;
df789fe7
DF		 6263 if (rt->rt6i_pcpu) {
6264 for_each_possible_cpu(cpu) {
6265 struct rt6_info **rtp;
6266
6267 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
6268 addrconf_set_nopolicy(*rtp, val);
6269 }
6270 }
66f5d6ce 6271 rcu_read_unlock();
df789fe7
DF		 6272 }
6273 spin_unlock(&ifa->lock);
6274 }
6275 read_unlock_bh(&idev->lock);
6276}
6277
6278static
6279int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6280{
6281 struct inet6_dev *idev;
6282 struct net *net;
6283
6284 if (!rtnl_trylock())
6285 return restart_syscall();
6286
6287 *valp = val;
6288
6289 net = (struct net *)ctl->extra2;
6290 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6291 rtnl_unlock();
6292 return 0;
6293 }
6294
6295 if (valp == &net->ipv6.devconf_all->disable_policy) {
6296 struct net_device *dev;
6297
6298 for_each_netdev(net, dev) {
6299 idev = __in6_dev_get(dev);
6300 if (idev)
6301 addrconf_disable_policy_idev(idev, val);
6302 }
6303 } else {
6304 idev = (struct inet6_dev *)ctl->extra1;
6305 addrconf_disable_policy_idev(idev, val);
6306 }
6307
6308 rtnl_unlock();
6309 return 0;
6310}
6311
6312static
6313int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6314 void __user *buffer, size_t *lenp,
6315 loff_t *ppos)
6316{
6317 int *valp = ctl->data;
6318 int val = *valp;
6319 loff_t pos = *ppos;
6320 struct ctl_table lctl;
6321 int ret;
6322
6323 lctl = *ctl;
6324 lctl.data = &val;
6325 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6326
6327 if (write && (*valp != val))
6328 ret = addrconf_disable_policy(ctl, valp, val);
6329
6330 if (ret)
6331 *ppos = pos;
6332
6333 return ret;
6334}
6335
cb4a4c69 6336static int minus_one = -1;
2210d6b2 6337static const int zero = 0;
cb9e684e
MŻ		 6338static const int one = 1;
6339static const int two_five_five = 255;
6340
607ea7cd 6341static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 6342 {
6343 .procname = "forwarding",
6344 .data = &ipv6_devconf.forwarding,
6345 .maxlen = sizeof(int),
6346 .mode = 0644,
6347 .proc_handler = addrconf_sysctl_forward,
6348 },
6349 {
6350 .procname = "hop_limit",
6351 .data = &ipv6_devconf.hop_limit,
6352 .maxlen = sizeof(int),
6353 .mode = 0644,
cb9e684e
MŻ		 6354 .proc_handler = proc_dointvec_minmax,
6355 .extra1 = (void *)&one,
6356 .extra2 = (void *)&two_five_five,
5df1f77f
KK		 6357 },
6358 {
6359 .procname = "mtu",
6360 .data = &ipv6_devconf.mtu6,
6361 .maxlen = sizeof(int),
6362 .mode = 0644,
6363 .proc_handler = addrconf_sysctl_mtu,
6364 },
6365 {
6366 .procname = "accept_ra",
6367 .data = &ipv6_devconf.accept_ra,
6368 .maxlen = sizeof(int),
6369 .mode = 0644,
6370 .proc_handler = proc_dointvec,
6371 },
6372 {
6373 .procname = "accept_redirects",
6374 .data = &ipv6_devconf.accept_redirects,
6375 .maxlen = sizeof(int),
6376 .mode = 0644,
6377 .proc_handler = proc_dointvec,
6378 },
6379 {
6380 .procname = "autoconf",
6381 .data = &ipv6_devconf.autoconf,
6382 .maxlen = sizeof(int),
6383 .mode = 0644,
6384 .proc_handler = proc_dointvec,
6385 },
6386 {
6387 .procname = "dad_transmits",
6388 .data = &ipv6_devconf.dad_transmits,
6389 .maxlen = sizeof(int),
6390 .mode = 0644,
6391 .proc_handler = proc_dointvec,
6392 },
6393 {
6394 .procname = "router_solicitations",
6395 .data = &ipv6_devconf.rtr_solicits,
6396 .maxlen = sizeof(int),
6397 .mode = 0644,
cb4a4c69
MŻ		 6398 .proc_handler = proc_dointvec_minmax,
6399 .extra1 = &minus_one,
5df1f77f
KK		 6400 },
6401 {
6402 .procname = "router_solicitation_interval",
6403 .data = &ipv6_devconf.rtr_solicit_interval,
6404 .maxlen = sizeof(int),
6405 .mode = 0644,
6406 .proc_handler = proc_dointvec_jiffies,
6407 },
bd11f074
MŻ		 6408 {
6409 .procname = "router_solicitation_max_interval",
6410 .data = &ipv6_devconf.rtr_solicit_max_interval,
6411 .maxlen = sizeof(int),
6412 .mode = 0644,
6413 .proc_handler = proc_dointvec_jiffies,
6414 },
5df1f77f
KK		 6415 {
6416 .procname = "router_solicitation_delay",
6417 .data = &ipv6_devconf.rtr_solicit_delay,
6418 .maxlen = sizeof(int),
6419 .mode = 0644,
6420 .proc_handler = proc_dointvec_jiffies,
6421 },
6422 {
6423 .procname = "force_mld_version",
6424 .data = &ipv6_devconf.force_mld_version,
6425 .maxlen = sizeof(int),
6426 .mode = 0644,
6427 .proc_handler = proc_dointvec,
6428 },
6429 {
6430 .procname = "mldv1_unsolicited_report_interval",
6431 .data =
6432 &ipv6_devconf.mldv1_unsolicited_report_interval,
6433 .maxlen = sizeof(int),
6434 .mode = 0644,
6435 .proc_handler = proc_dointvec_ms_jiffies,
6436 },
6437 {
6438 .procname = "mldv2_unsolicited_report_interval",
6439 .data =
6440 &ipv6_devconf.mldv2_unsolicited_report_interval,
6441 .maxlen = sizeof(int),
6442 .mode = 0644,
6443 .proc_handler = proc_dointvec_ms_jiffies,
6444 },
6445 {
6446 .procname = "use_tempaddr",
6447 .data = &ipv6_devconf.use_tempaddr,
6448 .maxlen = sizeof(int),
6449 .mode = 0644,
6450 .proc_handler = proc_dointvec,
6451 },
6452 {
6453 .procname = "temp_valid_lft",
6454 .data = &ipv6_devconf.temp_valid_lft,
6455 .maxlen = sizeof(int),
6456 .mode = 0644,
6457 .proc_handler = proc_dointvec,
6458 },
6459 {
6460 .procname = "temp_prefered_lft",
6461 .data = &ipv6_devconf.temp_prefered_lft,
6462 .maxlen = sizeof(int),
6463 .mode = 0644,
6464 .proc_handler = proc_dointvec,
6465 },
6466 {
6467 .procname = "regen_max_retry",
6468 .data = &ipv6_devconf.regen_max_retry,
6469 .maxlen = sizeof(int),
6470 .mode = 0644,
6471 .proc_handler = proc_dointvec,
6472 },
6473 {
6474 .procname = "max_desync_factor",
6475 .data = &ipv6_devconf.max_desync_factor,
6476 .maxlen = sizeof(int),
6477 .mode = 0644,
6478 .proc_handler = proc_dointvec,
6479 },
6480 {
6481 .procname = "max_addresses",
6482 .data = &ipv6_devconf.max_addresses,
6483 .maxlen = sizeof(int),
6484 .mode = 0644,
6485 .proc_handler = proc_dointvec,
6486 },
6487 {
6488 .procname = "accept_ra_defrtr",
6489 .data = &ipv6_devconf.accept_ra_defrtr,
6490 .maxlen = sizeof(int),
6491 .mode = 0644,
6492 .proc_handler = proc_dointvec,
6493 },
6494 {
6495 .procname = "accept_ra_min_hop_limit",
6496 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6497 .maxlen = sizeof(int),
6498 .mode = 0644,
6499 .proc_handler = proc_dointvec,
6500 },
6501 {
6502 .procname = "accept_ra_pinfo",
6503 .data = &ipv6_devconf.accept_ra_pinfo,
6504 .maxlen = sizeof(int),
6505 .mode = 0644,
6506 .proc_handler = proc_dointvec,
6507 },
930d6ff2 6508#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 6509 {
6510 .procname = "accept_ra_rtr_pref",
6511 .data = &ipv6_devconf.accept_ra_rtr_pref,
6512 .maxlen = sizeof(int),
6513 .mode = 0644,
6514 .proc_handler = proc_dointvec,
6515 },
6516 {
6517 .procname = "router_probe_interval",
6518 .data = &ipv6_devconf.rtr_probe_interval,
6519 .maxlen = sizeof(int),
6520 .mode = 0644,
6521 .proc_handler = proc_dointvec_jiffies,
6522 },
fa03ef38 6523#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b
JS		 6524 {
6525 .procname = "accept_ra_rt_info_min_plen",
6526 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6527 .maxlen = sizeof(int),
6528 .mode = 0644,
6529 .proc_handler = proc_dointvec,
6530 },
5df1f77f
KK		 6531 {
6532 .procname = "accept_ra_rt_info_max_plen",
6533 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6534 .maxlen = sizeof(int),
6535 .mode = 0644,
6536 .proc_handler = proc_dointvec,
6537 },
09c884d4 6538#endif
930d6ff2 6539#endif
5df1f77f
KK		 6540 {
6541 .procname = "proxy_ndp",
6542 .data = &ipv6_devconf.proxy_ndp,
6543 .maxlen = sizeof(int),
6544 .mode = 0644,
6545 .proc_handler = addrconf_sysctl_proxy_ndp,
6546 },
6547 {
6548 .procname = "accept_source_route",
6549 .data = &ipv6_devconf.accept_source_route,
6550 .maxlen = sizeof(int),
6551 .mode = 0644,
6552 .proc_handler = proc_dointvec,
6553 },
95c385b4 6554#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 6555 {
6556 .procname = "optimistic_dad",
6557 .data = &ipv6_devconf.optimistic_dad,
6558 .maxlen = sizeof(int),
6559 .mode = 0644,
6560 .proc_handler = proc_dointvec,
6561 },
6562 {
6563 .procname = "use_optimistic",
6564 .data = &ipv6_devconf.use_optimistic,
6565 .maxlen = sizeof(int),
6566 .mode = 0644,
6567 .proc_handler = proc_dointvec,
6568 },
7bc570c8
YH		 6569#endif
6570#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 6571 {
6572 .procname = "mc_forwarding",
6573 .data = &ipv6_devconf.mc_forwarding,
6574 .maxlen = sizeof(int),
6575 .mode = 0444,
6576 .proc_handler = proc_dointvec,
6577 },
95c385b4 6578#endif
5df1f77f
KK		 6579 {
6580 .procname = "disable_ipv6",
6581 .data = &ipv6_devconf.disable_ipv6,
6582 .maxlen = sizeof(int),
6583 .mode = 0644,
6584 .proc_handler = addrconf_sysctl_disable,
6585 },
6586 {
6587 .procname = "accept_dad",
6588 .data = &ipv6_devconf.accept_dad,
6589 .maxlen = sizeof(int),
6590 .mode = 0644,
6591 .proc_handler = proc_dointvec,
6592 },
6593 {
6594 .procname = "force_tllao",
6595 .data = &ipv6_devconf.force_tllao,
6596 .maxlen = sizeof(int),
6597 .mode = 0644,
6598 .proc_handler = proc_dointvec
6599 },
6600 {
6601 .procname = "ndisc_notify",
6602 .data = &ipv6_devconf.ndisc_notify,
6603 .maxlen = sizeof(int),
6604 .mode = 0644,
6605 .proc_handler = proc_dointvec
6606 },
6607 {
6608 .procname = "suppress_frag_ndisc",
6609 .data = &ipv6_devconf.suppress_frag_ndisc,
6610 .maxlen = sizeof(int),
6611 .mode = 0644,
6612 .proc_handler = proc_dointvec
6613 },
6614 {
6615 .procname = "accept_ra_from_local",
6616 .data = &ipv6_devconf.accept_ra_from_local,
6617 .maxlen = sizeof(int),
6618 .mode = 0644,
6619 .proc_handler = proc_dointvec,
6620 },
6621 {
6622 .procname = "accept_ra_mtu",
6623 .data = &ipv6_devconf.accept_ra_mtu,
6624 .maxlen = sizeof(int),
6625 .mode = 0644,
6626 .proc_handler = proc_dointvec,
6627 },
6628 {
6629 .procname = "stable_secret",
6630 .data = &ipv6_devconf.stable_secret,
6631 .maxlen = IPV6_MAX_STRLEN,
6632 .mode = 0600,
6633 .proc_handler = addrconf_sysctl_stable_secret,
6634 },
6635 {
6636 .procname = "use_oif_addrs_only",
6637 .data = &ipv6_devconf.use_oif_addrs_only,
6638 .maxlen = sizeof(int),
6639 .mode = 0644,
6640 .proc_handler = proc_dointvec,
6641 },
6642 {
6643 .procname = "ignore_routes_with_linkdown",
6644 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6645 .maxlen = sizeof(int),
6646 .mode = 0644,
6647 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6648 },
6649 {
6650 .procname = "drop_unicast_in_l2_multicast",
6651 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6652 .maxlen = sizeof(int),
6653 .mode = 0644,
6654 .proc_handler = proc_dointvec,
6655 },
6656 {
6657 .procname = "drop_unsolicited_na",
6658 .data = &ipv6_devconf.drop_unsolicited_na,
6659 .maxlen = sizeof(int),
6660 .mode = 0644,
6661 .proc_handler = proc_dointvec,
6662 },
6663 {
6664 .procname = "keep_addr_on_down",
6665 .data = &ipv6_devconf.keep_addr_on_down,
6666 .maxlen = sizeof(int),
6667 .mode = 0644,
6668 .proc_handler = proc_dointvec,
6669
6670 },
1ababeba
DL		 6671 {
6672 .procname = "seg6_enabled",
6673 .data = &ipv6_devconf.seg6_enabled,
6674 .maxlen = sizeof(int),
6675 .mode = 0644,
6676 .proc_handler = proc_dointvec,
6677 },
bf355b8d
DL		 6678#ifdef CONFIG_IPV6_SEG6_HMAC
6679 {
6680 .procname = "seg6_require_hmac",
6681 .data = &ipv6_devconf.seg6_require_hmac,
6682 .maxlen = sizeof(int),
6683 .mode = 0644,
6684 .proc_handler = proc_dointvec,
6685 },
6686#endif
adc176c5
EN		 6687 {
6688 .procname = "enhanced_dad",
6689 .data = &ipv6_devconf.enhanced_dad,
6690 .maxlen = sizeof(int),
6691 .mode = 0644,
6692 .proc_handler = proc_dointvec,
6693 },
d35a00b8
FJ		 6694 {
6695 .procname = "addr_gen_mode",
6696 .data = &ipv6_devconf.addr_gen_mode,
6697 .maxlen = sizeof(int),
6698 .mode = 0644,
6699 .proc_handler = addrconf_sysctl_addr_gen_mode,
6700 },
df789fe7
DF		 6701 {
6702 .procname = "disable_policy",
6703 .data = &ipv6_devconf.disable_policy,
6704 .maxlen = sizeof(int),
6705 .mode = 0644,
6706 .proc_handler = addrconf_sysctl_disable_policy,
6707 },
2210d6b2
MŻ		 6708 {
6709 .procname = "ndisc_tclass",
6710 .data = &ipv6_devconf.ndisc_tclass,
6711 .maxlen = sizeof(int),
6712 .mode = 0644,
6713 .proc_handler = proc_dointvec_minmax,
6714 .extra1 = (void *)&zero,
6715 .extra2 = (void *)&two_five_five,
6716 },
5df1f77f
KK		 6717 {
6718 /* sentinel */
6719 }
1da177e4
LT		 6720};
6721
bff16c2f 6722static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 6723 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4 6724{
29c994e3 6725 int i, ifindex;
607ea7cd 6726 struct ctl_table *table;
6105e293 6727 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 6728
607ea7cd
KK		 6729 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6730 if (!table)
f68635e6
PE		 6731 goto out;
6732
607ea7cd
KK		 6733 for (i = 0; table[i].data; i++) {
6734 table[i].data += (char *)p - (char *)&ipv6_devconf;
cb9e684e
MŻ		 6735 /* If one of these is already set, then it is not safe to
6736 * overwrite either of them: this makes proc_dointvec_minmax
6737 * usable.
6738 */
6739 if (!table[i].extra1 && !table[i].extra2) {
6740 table[i].extra1 = idev; /* embedded; no ref */
6741 table[i].extra2 = net;
6742 }
1da177e4 6743 }
1da177e4 6744
6105e293 6745 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 6746
607ea7cd
KK		 6747 p->sysctl_header = register_net_sysctl(net, path, table);
6748 if (!p->sysctl_header)
6105e293 6749 goto free;
f68635e6 6750
29c994e3
ND		 6751 if (!strcmp(dev_name, "all"))
6752 ifindex = NETCONFA_IFINDEX_ALL;
6753 else if (!strcmp(dev_name, "default"))
6754 ifindex = NETCONFA_IFINDEX_DEFAULT;
6755 else
6756 ifindex = idev->dev->ifindex;
85b3daad
DA		 6757 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6758 ifindex, p);
95897312 6759 return 0;
1da177e4 6760
f68635e6 6761free:
607ea7cd 6762 kfree(table);
f68635e6 6763out:
95897312 6764 return -ENOBUFS;
1da177e4
LT		 6765}
6766
23452170
DA		 6767static void __addrconf_sysctl_unregister(struct net *net,
6768 struct ipv6_devconf *p, int ifindex)
408c4768 6769{
607ea7cd 6770 struct ctl_table *table;
408c4768 6771
607ea7cd 6772 if (!p->sysctl_header)
408c4768
PE		 6773 return;
6774
607ea7cd
KK		 6775 table = p->sysctl_header->ctl_table_arg;
6776 unregister_net_sysctl_table(p->sysctl_header);
6777 p->sysctl_header = NULL;
6778 kfree(table);
23452170
DA		 6779
6780 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
408c4768
PE		 6781}
6782
a317a2f1 6783static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 6784{
a317a2f1
WC		 6785 int err;
6786
6787 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6788 return -EINVAL;
6789
6790 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6791 &ndisc_ifinfo_sysctl_change);
6792 if (err)
6793 return err;
6794 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6795 idev, &idev->cnf);
6796 if (err)
6797 neigh_sysctl_unregister(idev->nd_parms);
6798
6799 return err;
f52295a9
PE		 6800}
6801
408c4768 6802static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 6803{
23452170
DA		 6804 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6805 idev->dev->ifindex);
408c4768 6806 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 6807}
6808
6809
6810#endif
6811
2c8c1e72 6812static int __net_init addrconf_init_net(struct net *net)
e0da5a48 6813{
a79ca223 6814 int err = -ENOMEM;
e0da5a48
PE		 6815 struct ipv6_devconf *all, *dflt;
6816
a79ca223 6817 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 6818 if (!all)
a79ca223 6819 goto err_alloc_all;
e0da5a48 6820
a79ca223 6821 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 6822 if (!dflt)
a79ca223 6823 goto err_alloc_dflt;
e0da5a48 6824
a79ca223
HZ		 6825 /* these will be inherited by all namespaces */
6826 dflt->autoconf = ipv6_defaults.autoconf;
6827 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 6828
3d1bec99
HFS		 6829 dflt->stable_secret.initialized = false;
6830 all->stable_secret.initialized = false;
6831
e0da5a48
PE		 6832 net->ipv6.devconf_all = all;
6833 net->ipv6.devconf_dflt = dflt;
6834
6835#ifdef CONFIG_SYSCTL
f8572d8f 6836 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 6837 if (err < 0)
6838 goto err_reg_all;
6839
f8572d8f 6840 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 6841 if (err < 0)
6842 goto err_reg_dflt;
6843#endif
6844 return 0;
6845
6846#ifdef CONFIG_SYSCTL
6847err_reg_dflt:
23452170 6848 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
e0da5a48
PE		 6849err_reg_all:
6850 kfree(dflt);
6851#endif
6852err_alloc_dflt:
6853 kfree(all);
6854err_alloc_all:
6855 return err;
6856}
6857
2c8c1e72 6858static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 6859{
6860#ifdef CONFIG_SYSCTL
23452170
DA		 6861 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6862 NETCONFA_IFINDEX_DEFAULT);
6863 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6864 NETCONFA_IFINDEX_ALL);
e0da5a48 6865#endif
73cf0e92 6866 kfree(net->ipv6.devconf_dflt);
6867 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 6868}
6869
6870static struct pernet_operations addrconf_ops = {
6871 .init = addrconf_init_net,
6872 .exit = addrconf_exit_net,
6873};
6874
207895fd 6875static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 6876 .family = AF_INET6,
6877 .fill_link_af = inet6_fill_link_af,
6878 .get_link_af_size = inet6_get_link_af_size,
11b1f828 6879 .validate_link_af = inet6_validate_link_af,
f53adae4 6880 .set_link_af = inet6_set_link_af,
b382b191
TG		 6881};
6882
1da177e4
LT		 6883/*
6884 * Init / cleanup code
6885 */
6886
6887int __init addrconf_init(void)
6888{
a317a2f1 6889 struct inet6_dev *idev;
c2e21293 6890 int i, err;
2a8cc6c8 6891
e21e8467
SH		 6892 err = ipv6_addr_label_init();
6893 if (err < 0) {
f3213831
JP		 6894 pr_crit("%s: cannot initialize default policy table: %d\n",
6895 __func__, err);
2cc6d2bf 6896 goto out;
2a8cc6c8 6897 }
1da177e4 6898
2cc6d2bf
NH		 6899 err = register_pernet_subsys(&addrconf_ops);
6900 if (err < 0)
6901 goto out_addrlabel;
e0da5a48 6902
c15b1cca
HFS		 6903 addrconf_wq = create_workqueue("ipv6_addrconf");
6904 if (!addrconf_wq) {
6905 err = -ENOMEM;
6906 goto out_nowq;
6907 }
6908
1da177e4
LT		 6909 /* The addrconf netdev notifier requires that loopback_dev
6910 * has it's ipv6 private information allocated and setup
6911 * before it can bring up and give link-local addresses
6912 * to other devices which are up.
6913 *
6914 * Unfortunately, loopback_dev is not necessarily the first
6915 * entry in the global dev_base list of net devices. In fact,
6916 * it is likely to be the very last entry on that list.
6917 * So this causes the notifier registry below to try and
6918 * give link-local addresses to all devices besides loopback_dev
6919 * first, then loopback_dev, which cases all the non-loopback_dev
6920 * devices to fail to get a link-local address.
6921 *
6922 * So, as a temporary fix, allocate the ipv6 structure for
6923 * loopback_dev first by hand.
6924 * Longer term, all of the dependencies ipv6 has upon the loopback
6925 * device and it being up should be removed.
6926 */
6927 rtnl_lock();
a317a2f1 6928 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 6929 rtnl_unlock();
a317a2f1
WC		 6930 if (IS_ERR(idev)) {
6931 err = PTR_ERR(idev);
e0da5a48 6932 goto errlo;
a317a2f1 6933 }
1da177e4 6934
2f460933
WC		 6935 ip6_route_init_special_entries();
6936
c2e21293 6937 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6938 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6939
1da177e4
LT		 6940 register_netdevice_notifier(&ipv6_dev_notf);
6941
c15b1cca 6942 addrconf_verify();
c127ea2c 6943
3678a9d8 6944 rtnl_af_register(&inet6_ops);
b382b191 6945
16feebcf
FW		 6946 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
6947 NULL, inet6_dump_ifinfo, 0);
c127ea2c
TG		 6948 if (err < 0)
6949 goto errout;
6950
16feebcf
FW		 6951 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
6952 inet6_rtm_newaddr, NULL, 0);
6953 if (err < 0)
6954 goto errout;
6955 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
6956 inet6_rtm_deladdr, NULL, 0);
6957 if (err < 0)
6958 goto errout;
6959 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
6960 inet6_rtm_getaddr, inet6_dump_ifaddr,
6961 RTNL_FLAG_DOIT_UNLOCKED);
6962 if (err < 0)
6963 goto errout;
6964 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
6965 NULL, inet6_dump_ifmcaddr, 0);
6966 if (err < 0)
6967 goto errout;
6968 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
6969 NULL, inet6_dump_ifacaddr, 0);
6970 if (err < 0)
6971 goto errout;
6972 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
6973 inet6_netconf_get_devconf,
6974 inet6_netconf_dump_devconf,
6975 RTNL_FLAG_DOIT_UNLOCKED);
6976 if (err < 0)
6977 goto errout;
a3fde2ad
FW		 6978 err = ipv6_addr_label_rtnl_register();
6979 if (err < 0)
6980 goto errout;
2a8cc6c8 6981
1da177e4 6982 return 0;
c127ea2c 6983errout:
16feebcf 6984 rtnl_unregister_all(PF_INET6);
b382b191 6985 rtnl_af_unregister(&inet6_ops);
c127ea2c 6986 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6987errlo:
c15b1cca
HFS		 6988 destroy_workqueue(addrconf_wq);
6989out_nowq:
e0da5a48 6990 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 6991out_addrlabel:
6992 ipv6_addr_label_cleanup();
6993out:
c127ea2c 6994 return err;
1da177e4
LT		 6995}
6996
09f7709f 6997void addrconf_cleanup(void)
1da177e4 6998{
176c39af 6999 struct net_device *dev;
1da177e4
LT		 7000 int i;
7001
7002 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 7003 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 7004 ipv6_addr_label_cleanup();
1da177e4 7005
5c45121d 7006 rtnl_af_unregister(&inet6_ops);
1da177e4 7007
5c45121d 7008 rtnl_lock();
b382b191 7009
176c39af
DL		 7010 /* clean dev list */
7011 for_each_netdev(&init_net, dev) {
7012 if (__in6_dev_get(dev) == NULL)
7013 continue;
7014 addrconf_ifdown(dev, 1);
7015 }
7016 addrconf_ifdown(init_net.loopback_dev, 2);
7017
1da177e4
LT		 7018 /*
7019 * Check hash table.
7020 */
5c578aed 7021 spin_lock_bh(&addrconf_hash_lock);
c2e21293 7022 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7023 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 7024 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 7025 cancel_delayed_work(&addr_chk_work);
1da177e4 7026 rtnl_unlock();
c15b1cca
HFS		 7027
7028 destroy_workqueue(addrconf_wq);
1da177e4 7029}
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