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sit: fix 4in4 + IPsec scenario
[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>
1da177e4
LT		 46#include <linux/socket.h>
47#include <linux/sockios.h>
1da177e4
LT		 48#include <linux/net.h>
49#include <linux/in6.h>
50#include <linux/netdevice.h>
1823730f 51#include <linux/if_addr.h>
1da177e4
LT		 52#include <linux/if_arp.h>
53#include <linux/if_arcnet.h>
54#include <linux/if_infiniband.h>
55#include <linux/route.h>
56#include <linux/inetdevice.h>
57#include <linux/init.h>
5a0e3ad6 58#include <linux/slab.h>
1da177e4
LT		 59#ifdef CONFIG_SYSCTL
60#include <linux/sysctl.h>
61#endif
4fc268d2 62#include <linux/capability.h>
1da177e4
LT		 63#include <linux/delay.h>
64#include <linux/notifier.h>
543537bd 65#include <linux/string.h>
ddbe5032 66#include <linux/hash.h>
1da177e4 67
457c4cbc 68#include <net/net_namespace.h>
1da177e4
LT		 69#include <net/sock.h>
70#include <net/snmp.h>
71
06a4c1c5 72#include <net/af_ieee802154.h>
cb6bf355 73#include <net/firewire.h>
1da177e4
LT		 74#include <net/ipv6.h>
75#include <net/protocol.h>
76#include <net/ndisc.h>
77#include <net/ip6_route.h>
78#include <net/addrconf.h>
79#include <net/tcp.h>
80#include <net/ip.h>
5d620266 81#include <net/netlink.h>
f24e3d65 82#include <net/pkt_sched.h>
1da177e4
LT		 83#include <linux/if_tunnel.h>
84#include <linux/rtnetlink.h>
f3a1bfb1 85#include <linux/netconf.h>
1da177e4
LT		 86
87#ifdef CONFIG_IPV6_PRIVACY
88#include <linux/random.h>
1da177e4
LT		 89#endif
90
e21e8467 91#include <linux/uaccess.h>
7f7d9a6b 92#include <asm/unaligned.h>
1da177e4
LT		 93
94#include <linux/proc_fs.h>
95#include <linux/seq_file.h>
bc3b2d7f 96#include <linux/export.h>
1da177e4
LT		 97
98/* Set to 3 to get tracing... */
99#define ACONF_DEBUG 2
100
101#if ACONF_DEBUG >= 3
102#define ADBG(x) printk x
103#else
104#define ADBG(x)
105#endif
106
107#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e
TG		 108
109static inline u32 cstamp_delta(unsigned long cstamp)
110{
111 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
112}
1da177e4
LT		 113
114#ifdef CONFIG_SYSCTL
f52295a9 115static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 116static void addrconf_sysctl_unregister(struct inet6_dev *idev);
117#else
118static inline void addrconf_sysctl_register(struct inet6_dev *idev)
119{
120}
121
122static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
123{
124}
1da177e4
LT		 125#endif
126
127#ifdef CONFIG_IPV6_PRIVACY
eb7e0575
SD		 128static void __ipv6_regen_rndid(struct inet6_dev *idev);
129static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 130static void ipv6_regen_rndid(unsigned long data);
1da177e4
LT		 131#endif
132
1b34be74 133static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 134static int ipv6_count_addresses(struct inet6_dev *idev);
135
136/*
137 * Configured unicast address hash table
138 */
c2e21293 139static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 140static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 141
1da177e4
LT		 142static void addrconf_verify(unsigned long);
143
8d06afab 144static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 145static DEFINE_SPINLOCK(addrconf_verify_lock);
146
147static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
148static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
149
93d9b7d7
JP		 150static void addrconf_type_change(struct net_device *dev,
151 unsigned long event);
1da177e4
LT		 152static int addrconf_ifdown(struct net_device *dev, int how);
153
21caa662
RK		 154static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
155 int plen,
156 const struct net_device *dev,
157 u32 flags, u32 noflags);
158
cf22f9a2 159static void addrconf_dad_start(struct inet6_ifaddr *ifp);
1da177e4
LT		 160static void addrconf_dad_timer(unsigned long data);
161static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 162static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 163static void addrconf_rs_timer(unsigned long data);
164static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
165static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
166
1ab1457c 167static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 168 struct prefix_info *pinfo);
3e81c6da
DM		 169static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
170 struct net_device *dev);
1da177e4 171
888c848e 172static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 173 .forwarding = 0,
174 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
175 .mtu6 = IPV6_MIN_MTU,
176 .accept_ra = 1,
177 .accept_redirects = 1,
178 .autoconf = 1,
179 .force_mld_version = 0,
180 .dad_transmits = 1,
181 .rtr_solicits = MAX_RTR_SOLICITATIONS,
182 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
183 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
184#ifdef CONFIG_IPV6_PRIVACY
185 .use_tempaddr = 0,
186 .temp_valid_lft = TEMP_VALID_LIFETIME,
187 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
188 .regen_max_retry = REGEN_MAX_RETRY,
189 .max_desync_factor = MAX_DESYNC_FACTOR,
190#endif
191 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 192 .accept_ra_defrtr = 1,
c4fd30eb 193 .accept_ra_pinfo = 1,
930d6ff2
YH		 194#ifdef CONFIG_IPV6_ROUTER_PREF
195 .accept_ra_rtr_pref = 1,
52e16356 196 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 197#ifdef CONFIG_IPV6_ROUTE_INFO
198 .accept_ra_rt_info_max_plen = 0,
199#endif
930d6ff2 200#endif
fbea49e1 201 .proxy_ndp = 0,
0bcbc926 202 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 203 .disable_ipv6 = 0,
1b34be74 204 .accept_dad = 1,
1da177e4
LT		 205};
206
ab32ea5d 207static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 208 .forwarding = 0,
209 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
210 .mtu6 = IPV6_MIN_MTU,
211 .accept_ra = 1,
212 .accept_redirects = 1,
213 .autoconf = 1,
214 .dad_transmits = 1,
215 .rtr_solicits = MAX_RTR_SOLICITATIONS,
216 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
217 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
218#ifdef CONFIG_IPV6_PRIVACY
219 .use_tempaddr = 0,
220 .temp_valid_lft = TEMP_VALID_LIFETIME,
221 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
222 .regen_max_retry = REGEN_MAX_RETRY,
223 .max_desync_factor = MAX_DESYNC_FACTOR,
224#endif
225 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 226 .accept_ra_defrtr = 1,
c4fd30eb 227 .accept_ra_pinfo = 1,
930d6ff2
YH		 228#ifdef CONFIG_IPV6_ROUTER_PREF
229 .accept_ra_rtr_pref = 1,
52e16356 230 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 231#ifdef CONFIG_IPV6_ROUTE_INFO
232 .accept_ra_rt_info_max_plen = 0,
233#endif
930d6ff2 234#endif
fbea49e1 235 .proxy_ndp = 0,
0bcbc926 236 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 237 .disable_ipv6 = 0,
1b34be74 238 .accept_dad = 1,
1da177e4
LT		 239};
240
241/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 242const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4 243const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
f3ee4010
YH		 244const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
245const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
2c5e8933
HFS		 246const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
247const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
248const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
1da177e4 249
f24e3d65 250/* Check if a valid qdisc is available */
05297949 251static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 252{
05297949 253 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 254}
255
b7b1bfce 256static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 257{
b7b1bfce
HFS		 258 if (del_timer(&idev->rs_timer))
259 __in6_dev_put(idev);
260}
261
262static void addrconf_del_dad_timer(struct inet6_ifaddr *ifp)
263{
264 if (del_timer(&ifp->dad_timer))
1da177e4
LT		 265 __in6_ifa_put(ifp);
266}
267
b7b1bfce
HFS		 268static void addrconf_mod_rs_timer(struct inet6_dev *idev,
269 unsigned long when)
270{
271 if (!timer_pending(&idev->rs_timer))
272 in6_dev_hold(idev);
273 mod_timer(&idev->rs_timer, jiffies + when);
274}
1da177e4 275
b7b1bfce
HFS		 276static void addrconf_mod_dad_timer(struct inet6_ifaddr *ifp,
277 unsigned long when)
1da177e4 278{
b7b1bfce 279 if (!timer_pending(&ifp->dad_timer))
1da177e4 280 in6_ifa_hold(ifp);
b7b1bfce 281 mod_timer(&ifp->dad_timer, jiffies + when);
1da177e4
LT		 282}
283
7f7d9a6b
HX		 284static int snmp6_alloc_dev(struct inet6_dev *idev)
285{
7d720c3e 286 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
1823e4c8
ED		 287 sizeof(struct ipstats_mib),
288 __alignof__(struct ipstats_mib)) < 0)
7f7d9a6b 289 goto err_ip;
be281e55
ED		 290 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
291 GFP_KERNEL);
292 if (!idev->stats.icmpv6dev)
7f7d9a6b 293 goto err_icmp;
be281e55
ED		 294 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
295 GFP_KERNEL);
296 if (!idev->stats.icmpv6msgdev)
14878f75 297 goto err_icmpmsg;
7f7d9a6b
HX		 298
299 return 0;
300
14878f75 301err_icmpmsg:
be281e55 302 kfree(idev->stats.icmpv6dev);
7f7d9a6b 303err_icmp:
7d720c3e 304 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b 305err_ip:
aaf70ec7 306 return -ENOMEM;
7f7d9a6b
HX		 307}
308
16910b98 309static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 310{
be281e55
ED		 311 kfree(idev->stats.icmpv6msgdev);
312 kfree(idev->stats.icmpv6dev);
7d720c3e 313 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b
HX		 314}
315
1da177e4
LT		 316/* Nobody refers to this device, we may destroy it. */
317
318void in6_dev_finish_destroy(struct inet6_dev *idev)
319{
320 struct net_device *dev = idev->dev;
547b792c 321
502a2ffd 322 WARN_ON(!list_empty(&idev->addr_list));
547b792c 323 WARN_ON(idev->mc_list != NULL);
b7b1bfce 324 WARN_ON(timer_pending(&idev->rs_timer));
547b792c 325
1da177e4 326#ifdef NET_REFCNT_DEBUG
91df42be 327 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
1da177e4
LT		 328#endif
329 dev_put(dev);
330 if (!idev->dead) {
f3213831 331 pr_warn("Freeing alive inet6 device %p\n", idev);
1da177e4
LT		 332 return;
333 }
334 snmp6_free_dev(idev);
38f57d1a 335 kfree_rcu(idev, rcu);
1da177e4 336}
7159039a
YH		 337EXPORT_SYMBOL(in6_dev_finish_destroy);
338
8e5e8f30 339static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 340{
341 struct inet6_dev *ndev;
342
343 ASSERT_RTNL();
344
345 if (dev->mtu < IPV6_MIN_MTU)
346 return NULL;
347
1ab1457c 348 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 349
1ab1457c
YH		 350 if (ndev == NULL)
351 return NULL;
322f74a4
IO		 352
353 rwlock_init(&ndev->lock);
354 ndev->dev = dev;
502a2ffd 355 INIT_LIST_HEAD(&ndev->addr_list);
b7b1bfce
HFS		 356 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
357 (unsigned long)ndev);
c346dca1 358 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 359 ndev->cnf.mtu6 = dev->mtu;
360 ndev->cnf.sysctl = NULL;
361 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
362 if (ndev->nd_parms == NULL) {
363 kfree(ndev);
364 return NULL;
365 }
0187bdfb
BH		 366 if (ndev->cnf.forwarding)
367 dev_disable_lro(dev);
322f74a4
IO		 368 /* We refer to the device */
369 dev_hold(dev);
1da177e4 370
322f74a4
IO		 371 if (snmp6_alloc_dev(ndev) < 0) {
372 ADBG((KERN_WARNING
f3213831 373 "%s: cannot allocate memory for statistics; dev=%s.\n",
0dc47877 374 __func__, dev->name));
322f74a4 375 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 376 dev_put(dev);
377 kfree(ndev);
322f74a4
IO		 378 return NULL;
379 }
1da177e4 380
322f74a4
IO		 381 if (snmp6_register_dev(ndev) < 0) {
382 ADBG((KERN_WARNING
f3213831 383 "%s: cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 384 __func__, dev->name));
322f74a4
IO		 385 neigh_parms_release(&nd_tbl, ndev->nd_parms);
386 ndev->dead = 1;
387 in6_dev_finish_destroy(ndev);
388 return NULL;
389 }
390
391 /* One reference from device. We must do this before
392 * we invoke __ipv6_regen_rndid().
393 */
394 in6_dev_hold(ndev);
1da177e4 395
1b34be74
YH		 396 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
397 ndev->cnf.accept_dad = -1;
398
07a93626 399#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 400 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 401 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 402 ndev->cnf.rtr_solicits = 0;
403 }
404#endif
405
1da177e4 406#ifdef CONFIG_IPV6_PRIVACY
372e6c8f 407 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 408 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 409 if ((dev->flags&IFF_LOOPBACK) ||
410 dev->type == ARPHRD_TUNNEL ||
9625ed72 411 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 412 dev->type == ARPHRD_SIT ||
0be669bb 413 dev->type == ARPHRD_NONE) {
322f74a4
IO		 414 ndev->cnf.use_tempaddr = -1;
415 } else {
416 in6_dev_hold(ndev);
417 ipv6_regen_rndid((unsigned long) ndev);
418 }
1da177e4 419#endif
914faa14 420 ndev->token = in6addr_any;
1da177e4 421
f24e3d65 422 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 423 ndev->if_flags |= IF_READY;
424
322f74a4
IO		 425 ipv6_mc_init_dev(ndev);
426 ndev->tstamp = jiffies;
f52295a9 427 addrconf_sysctl_register(ndev);
30c4cf57 428 /* protected by rtnl_lock */
cf778b00 429 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 430
2c5e8933
HFS		 431 /* Join interface-local all-node multicast group */
432 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
433
d88ae4cc 434 /* Join all-node multicast group */
f3ee4010 435 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 436
d6ddef9e 437 /* Join all-router multicast group if forwarding is set */
8b2aaede 438 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 439 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
440
1da177e4
LT		 441 return ndev;
442}
443
8e5e8f30 444static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 445{
446 struct inet6_dev *idev;
447
448 ASSERT_RTNL();
449
e21e8467
SH		 450 idev = __in6_dev_get(dev);
451 if (!idev) {
452 idev = ipv6_add_dev(dev);
453 if (!idev)
1da177e4
LT		 454 return NULL;
455 }
c5e33bdd 456
1da177e4
LT		 457 if (dev->flags&IFF_UP)
458 ipv6_mc_up(idev);
459 return idev;
460}
461
f3a1bfb1
ND		 462static int inet6_netconf_msgsize_devconf(int type)
463{
464 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
465 + nla_total_size(4); /* NETCONFA_IFINDEX */
466
76f8f6cb
ND		 467 /* type -1 is used for ALL */
468 if (type == -1 || type == NETCONFA_FORWARDING)
f3a1bfb1 469 size += nla_total_size(4);
b1afce95 470#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 471 if (type == -1 || type == NETCONFA_MC_FORWARDING)
472 size += nla_total_size(4);
b1afce95 473#endif
f3a1bfb1
ND		 474
475 return size;
476}
477
478static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
479 struct ipv6_devconf *devconf, u32 portid,
480 u32 seq, int event, unsigned int flags,
481 int type)
482{
483 struct nlmsghdr *nlh;
484 struct netconfmsg *ncm;
485
486 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
487 flags);
488 if (nlh == NULL)
489 return -EMSGSIZE;
490
491 ncm = nlmsg_data(nlh);
492 ncm->ncm_family = AF_INET6;
493
494 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
495 goto nla_put_failure;
496
76f8f6cb
ND		 497 /* type -1 is used for ALL */
498 if ((type == -1 || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 499 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
500 goto nla_put_failure;
b1afce95 501#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 502 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
503 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
504 devconf->mc_forwarding) < 0)
505 goto nla_put_failure;
b1afce95 506#endif
f3a1bfb1
ND		 507 return nlmsg_end(skb, nlh);
508
509nla_put_failure:
510 nlmsg_cancel(skb, nlh);
511 return -EMSGSIZE;
512}
513
d67b8c61
ND		 514void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
515 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 516{
517 struct sk_buff *skb;
518 int err = -ENOBUFS;
519
520 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
521 if (skb == NULL)
522 goto errout;
523
524 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
525 RTM_NEWNETCONF, 0, type);
526 if (err < 0) {
527 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
528 WARN_ON(err == -EMSGSIZE);
529 kfree_skb(skb);
530 goto errout;
531 }
532 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
533 return;
534errout:
bd779028 535 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 536}
537
76f8f6cb
ND		 538static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
539 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
540 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
541};
542
543static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 544 struct nlmsghdr *nlh)
76f8f6cb
ND		 545{
546 struct net *net = sock_net(in_skb->sk);
547 struct nlattr *tb[NETCONFA_MAX+1];
548 struct netconfmsg *ncm;
549 struct sk_buff *skb;
550 struct ipv6_devconf *devconf;
551 struct inet6_dev *in6_dev;
552 struct net_device *dev;
553 int ifindex;
554 int err;
555
556 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
557 devconf_ipv6_policy);
558 if (err < 0)
559 goto errout;
560
561 err = EINVAL;
562 if (!tb[NETCONFA_IFINDEX])
563 goto errout;
564
565 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
566 switch (ifindex) {
567 case NETCONFA_IFINDEX_ALL:
568 devconf = net->ipv6.devconf_all;
569 break;
570 case NETCONFA_IFINDEX_DEFAULT:
571 devconf = net->ipv6.devconf_dflt;
572 break;
573 default:
574 dev = __dev_get_by_index(net, ifindex);
575 if (dev == NULL)
576 goto errout;
577 in6_dev = __in6_dev_get(dev);
578 if (in6_dev == NULL)
579 goto errout;
580 devconf = &in6_dev->cnf;
581 break;
582 }
583
584 err = -ENOBUFS;
585 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
586 if (skb == NULL)
587 goto errout;
588
589 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
590 NETLINK_CB(in_skb).portid,
591 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
592 -1);
593 if (err < 0) {
594 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
595 WARN_ON(err == -EMSGSIZE);
596 kfree_skb(skb);
597 goto errout;
598 }
599 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
600errout:
601 return err;
602}
603
7a674200
ND		 604static int inet6_netconf_dump_devconf(struct sk_buff *skb,
605 struct netlink_callback *cb)
606{
607 struct net *net = sock_net(skb->sk);
608 int h, s_h;
609 int idx, s_idx;
610 struct net_device *dev;
611 struct inet6_dev *idev;
612 struct hlist_head *head;
613
614 s_h = cb->args[0];
615 s_idx = idx = cb->args[1];
616
617 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
618 idx = 0;
619 head = &net->dev_index_head[h];
620 rcu_read_lock();
63998ac2
ND		 621 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
622 net->dev_base_seq;
7a674200
ND		 623 hlist_for_each_entry_rcu(dev, head, index_hlist) {
624 if (idx < s_idx)
625 goto cont;
626 idev = __in6_dev_get(dev);
627 if (!idev)
628 goto cont;
629
630 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
631 &idev->cnf,
632 NETLINK_CB(cb->skb).portid,
633 cb->nlh->nlmsg_seq,
634 RTM_NEWNETCONF,
635 NLM_F_MULTI,
636 -1) <= 0) {
637 rcu_read_unlock();
638 goto done;
639 }
63998ac2 640 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 641cont:
642 idx++;
643 }
644 rcu_read_unlock();
645 }
646 if (h == NETDEV_HASHENTRIES) {
647 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
648 net->ipv6.devconf_all,
649 NETLINK_CB(cb->skb).portid,
650 cb->nlh->nlmsg_seq,
651 RTM_NEWNETCONF, NLM_F_MULTI,
652 -1) <= 0)
653 goto done;
654 else
655 h++;
656 }
657 if (h == NETDEV_HASHENTRIES + 1) {
658 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
659 net->ipv6.devconf_dflt,
660 NETLINK_CB(cb->skb).portid,
661 cb->nlh->nlmsg_seq,
662 RTM_NEWNETCONF, NLM_F_MULTI,
663 -1) <= 0)
664 goto done;
665 else
666 h++;
667 }
668done:
669 cb->args[0] = h;
670 cb->args[1] = idx;
671
672 return skb->len;
673}
674
1da177e4
LT		 675#ifdef CONFIG_SYSCTL
676static void dev_forward_change(struct inet6_dev *idev)
677{
678 struct net_device *dev;
679 struct inet6_ifaddr *ifa;
1da177e4
LT		 680
681 if (!idev)
682 return;
683 dev = idev->dev;
0187bdfb
BH		 684 if (idev->cnf.forwarding)
685 dev_disable_lro(dev);
1a940835 686 if (dev->flags & IFF_MULTICAST) {
2c5e8933 687 if (idev->cnf.forwarding) {
f3ee4010 688 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 689 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
690 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
691 } else {
f3ee4010 692 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 693 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
694 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
695 }
1da177e4 696 }
502a2ffd 697
698 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 699 if (ifa->flags&IFA_F_TENTATIVE)
700 continue;
1da177e4
LT		 701 if (idev->cnf.forwarding)
702 addrconf_join_anycast(ifa);
703 else
704 addrconf_leave_anycast(ifa);
705 }
f3a1bfb1
ND		 706 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
707 dev->ifindex, &idev->cnf);
1da177e4
LT		 708}
709
710
e186932b 711static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 712{
713 struct net_device *dev;
714 struct inet6_dev *idev;
715
4acd4945 716 for_each_netdev(net, dev) {
1da177e4
LT		 717 idev = __in6_dev_get(dev);
718 if (idev) {
e186932b
PE		 719 int changed = (!idev->cnf.forwarding) ^ (!newf);
720 idev->cnf.forwarding = newf;
1da177e4
LT		 721 if (changed)
722 dev_forward_change(idev);
723 }
1da177e4 724 }
1da177e4 725}
c8fecf22 726
013d97e9 727static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 728{
bff16c2f 729 struct net *net;
013d97e9
FR		 730 int old;
731
732 if (!rtnl_trylock())
733 return restart_syscall();
bff16c2f
PE		 734
735 net = (struct net *)table->extra2;
013d97e9
FR		 736 old = *p;
737 *p = newf;
b325fddb 738
013d97e9 739 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 740 if ((!newf) ^ (!old))
741 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
742 NETCONFA_IFINDEX_DEFAULT,
743 net->ipv6.devconf_dflt);
013d97e9
FR		 744 rtnl_unlock();
745 return 0;
88af182e 746 }
c8fecf22 747
e186932b 748 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 749 net->ipv6.devconf_dflt->forwarding = newf;
750 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 751 if ((!newf) ^ (!old))
752 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
753 NETCONFA_IFINDEX_ALL,
754 net->ipv6.devconf_all);
013d97e9 755 } else if ((!newf) ^ (!old))
c8fecf22 756 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 757 rtnl_unlock();
c8fecf22 758
013d97e9 759 if (newf)
7b4da532 760 rt6_purge_dflt_routers(net);
b325fddb 761 return 1;
c8fecf22 762}
1da177e4
LT		 763#endif
764
5c578aed 765/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 766void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
767{
c2e21293 768 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 769
1da177e4 770#ifdef NET_REFCNT_DEBUG
91df42be 771 pr_debug("%s\n", __func__);
1da177e4
LT		 772#endif
773
774 in6_dev_put(ifp->idev);
775
b7b1bfce 776 if (del_timer(&ifp->dad_timer))
e21e8467 777 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
1da177e4 778
e9d3e084 779 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 780 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 781 return;
782 }
94e187c0 783 ip6_rt_put(ifp->rt);
1da177e4 784
e5785985 785 kfree_rcu(ifp, rcu);
1da177e4
LT		 786}
787
e55ffac6
BH		 788static void
789ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
790{
502a2ffd 791 struct list_head *p;
8a6ce0c0 792 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 793
794 /*
795 * Each device address list is sorted in order of scope -
796 * global before linklocal.
797 */
502a2ffd 798 list_for_each(p, &idev->addr_list) {
799 struct inet6_ifaddr *ifa
800 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 801 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 802 break;
803 }
804
b54c9b98 805 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 806}
807
ddbe5032 808static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 809{
ddbe5032 810 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 811}
812
1da177e4
LT		 813/* On success it returns ifp with increased reference count */
814
815static struct inet6_ifaddr *
816ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 817 int scope, u32 flags)
1da177e4
LT		 818{
819 struct inet6_ifaddr *ifa = NULL;
820 struct rt6_info *rt;
3a88a81d 821 unsigned int hash;
1da177e4 822 int err = 0;
d68b8270
YH		 823 int addr_type = ipv6_addr_type(addr);
824
825 if (addr_type == IPV6_ADDR_ANY ||
826 addr_type & IPV6_ADDR_MULTICAST ||
827 (!(idev->dev->flags & IFF_LOOPBACK) &&
828 addr_type & IPV6_ADDR_LOOPBACK))
829 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 830
8814c4b5 831 rcu_read_lock_bh();
1da177e4
LT		 832 if (idev->dead) {
833 err = -ENODEV; /*XXX*/
834 goto out2;
835 }
836
56d417b1 837 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 838 err = -EACCES;
839 goto out2;
840 }
841
5c578aed 842 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 843
844 /* Ignore adding duplicate addresses on an interface */
c346dca1 845 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 846 ADBG(("ipv6_add_addr: already assigned\n"));
847 err = -EEXIST;
848 goto out;
849 }
850
322f74a4 851 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 852
853 if (ifa == NULL) {
854 ADBG(("ipv6_add_addr: malloc failed\n"));
855 err = -ENOBUFS;
856 goto out;
857 }
858
8f031519 859 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 860 if (IS_ERR(rt)) {
861 err = PTR_ERR(rt);
862 goto out;
863 }
864
4e3fd7a0 865 ifa->addr = *addr;
1da177e4
LT		 866
867 spin_lock_init(&ifa->lock);
e9d3e084 868 spin_lock_init(&ifa->state_lock);
b7b1bfce
HFS		 869 setup_timer(&ifa->dad_timer, addrconf_dad_timer,
870 (unsigned long)ifa);
c2e21293 871 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 872 ifa->scope = scope;
873 ifa->prefix_len = pfxlen;
874 ifa->flags = flags | IFA_F_TENTATIVE;
875 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 876 ifa->tokenized = false;
1da177e4 877
57f5f544
KF		 878 ifa->rt = rt;
879
1da177e4
LT		 880 ifa->idev = idev;
881 in6_dev_hold(idev);
882 /* For caller */
883 in6_ifa_hold(ifa);
884
885 /* Add to big hash table */
ddbe5032 886 hash = inet6_addr_hash(addr);
1da177e4 887
5c578aed 888 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 889 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 890
891 write_lock(&idev->lock);
892 /* Add to inet6_dev unicast addr list. */
e55ffac6 893 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 894
895#ifdef CONFIG_IPV6_PRIVACY
896 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 897 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 898 in6_ifa_hold(ifa);
899 }
900#endif
901
1da177e4
LT		 902 in6_ifa_hold(ifa);
903 write_unlock(&idev->lock);
904out2:
8814c4b5 905 rcu_read_unlock_bh();
1da177e4 906
fd92833a 907 if (likely(err == 0))
f88c91dd 908 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 909 else {
910 kfree(ifa);
911 ifa = ERR_PTR(err);
912 }
913
914 return ifa;
915out:
5c578aed 916 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 917 goto out2;
918}
919
920/* This function wants to get referenced ifp and releases it before return */
921
922static void ipv6_del_addr(struct inet6_ifaddr *ifp)
923{
502a2ffd 924 struct inet6_ifaddr *ifa, *ifn;
1da177e4 925 struct inet6_dev *idev = ifp->idev;
4c5ff6a6 926 int state;
1da177e4
LT		 927 int deleted = 0, onlink = 0;
928 unsigned long expires = jiffies;
929
4c5ff6a6
HX		 930 spin_lock_bh(&ifp->state_lock);
931 state = ifp->state;
e9d3e084 932 ifp->state = INET6_IFADDR_STATE_DEAD;
4c5ff6a6
HX		 933 spin_unlock_bh(&ifp->state_lock);
934
935 if (state == INET6_IFADDR_STATE_DEAD)
936 goto out;
1da177e4 937
5c578aed 938 spin_lock_bh(&addrconf_hash_lock);
939 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 940 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 941
942 write_lock_bh(&idev->lock);
943#ifdef CONFIG_IPV6_PRIVACY
944 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 945 list_del(&ifp->tmp_list);
946 if (ifp->ifpub) {
947 in6_ifa_put(ifp->ifpub);
948 ifp->ifpub = NULL;
1da177e4 949 }
372e6c8f 950 __in6_ifa_put(ifp);
1da177e4
LT		 951 }
952#endif
953
502a2ffd 954 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
1da177e4 955 if (ifa == ifp) {
502a2ffd 956 list_del_init(&ifp->if_list);
1da177e4 957 __in6_ifa_put(ifp);
502a2ffd 958
1da177e4
LT		 959 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
960 break;
961 deleted = 1;
1d142804 962 continue;
1da177e4
LT		 963 } else if (ifp->flags & IFA_F_PERMANENT) {
964 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
965 ifp->prefix_len)) {
966 if (ifa->flags & IFA_F_PERMANENT) {
967 onlink = 1;
968 if (deleted)
969 break;
970 } else {
971 unsigned long lifetime;
972
973 if (!onlink)
974 onlink = -1;
975
976 spin_lock(&ifa->lock);
4bed72e4
YH		 977
978 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
979 /*
980 * Note: Because this address is
981 * not permanent, lifetime <
982 * LONG_MAX / HZ here.
983 */
1da177e4
LT		 984 if (time_before(expires,
985 ifa->tstamp + lifetime * HZ))
986 expires = ifa->tstamp + lifetime * HZ;
987 spin_unlock(&ifa->lock);
988 }
989 }
990 }
991 }
992 write_unlock_bh(&idev->lock);
993
b7b1bfce 994 addrconf_del_dad_timer(ifp);
b2238566 995
1da177e4
LT		 996 ipv6_ifa_notify(RTM_DELADDR, ifp);
997
f88c91dd 998 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 999
1da177e4
LT		 1000 /*
1001 * Purge or update corresponding prefix
1002 *
1003 * 1) we don't purge prefix here if address was not permanent.
1004 * prefix is managed by its own lifetime.
1005 * 2) if there're no addresses, delete prefix.
1006 * 3) if there're still other permanent address(es),
1007 * corresponding prefix is still permanent.
1008 * 4) otherwise, update prefix lifetime to the
1009 * longest valid lifetime among the corresponding
1010 * addresses on the device.
1011 * Note: subsequent RA will update lifetime.
1012 *
1013 * --yoshfuji
1014 */
1015 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
1016 struct in6_addr prefix;
1017 struct rt6_info *rt;
64c6d08e 1018
1da177e4 1019 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
1da177e4 1020
21caa662
RK		 1021 rt = addrconf_get_prefix_route(&prefix,
1022 ifp->prefix_len,
1023 ifp->idev->dev,
1024 0, RTF_GATEWAY | RTF_DEFAULT);
1025
1026 if (rt) {
1da177e4 1027 if (onlink == 0) {
e0a1ad73 1028 ip6_del_rt(rt);
1da177e4
LT		 1029 rt = NULL;
1030 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1716a961 1031 rt6_set_expires(rt, expires);
1da177e4
LT		 1032 }
1033 }
94e187c0 1034 ip6_rt_put(rt);
1da177e4
LT		 1035 }
1036
c3968a85
DW		 1037 /* clean up prefsrc entries */
1038 rt6_remove_prefsrc(ifp);
4c5ff6a6 1039out:
1da177e4
LT		 1040 in6_ifa_put(ifp);
1041}
1042
1043#ifdef CONFIG_IPV6_PRIVACY
1044static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1045{
1046 struct inet6_dev *idev = ifp->idev;
1047 struct in6_addr addr, *tmpaddr;
76f793e3 1048 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1049 unsigned long regen_advance;
1da177e4
LT		 1050 int tmp_plen;
1051 int ret = 0;
1052 int max_addresses;
95c385b4 1053 u32 addr_flags;
76f793e3 1054 unsigned long now = jiffies;
1da177e4
LT		 1055
1056 write_lock(&idev->lock);
1057 if (ift) {
1058 spin_lock_bh(&ift->lock);
1059 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1060 spin_unlock_bh(&ift->lock);
1061 tmpaddr = &addr;
1062 } else {
1063 tmpaddr = NULL;
1064 }
1065retry:
1066 in6_dev_hold(idev);
1067 if (idev->cnf.use_tempaddr <= 0) {
1068 write_unlock(&idev->lock);
f3213831 1069 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1070 in6_dev_put(idev);
1071 ret = -1;
1072 goto out;
1073 }
1074 spin_lock_bh(&ifp->lock);
1075 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1076 idev->cnf.use_tempaddr = -1; /*XXX*/
1077 spin_unlock_bh(&ifp->lock);
1078 write_unlock(&idev->lock);
f3213831
JP		 1079 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1080 __func__);
1da177e4
LT		 1081 in6_dev_put(idev);
1082 ret = -1;
1083 goto out;
1084 }
1085 in6_ifa_hold(ifp);
1086 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 1087 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1088 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1089 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 1090 tmp_valid_lft = min_t(__u32,
1091 ifp->valid_lft,
7a876b0e 1092 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 1093 tmp_prefered_lft = min_t(__u32,
1094 ifp->prefered_lft,
7a876b0e 1095 idev->cnf.temp_prefered_lft + age -
784e2710 1096 idev->cnf.max_desync_factor);
1da177e4
LT		 1097 tmp_plen = ifp->prefix_len;
1098 max_addresses = idev->cnf.max_addresses;
1da177e4
LT		 1099 tmp_tstamp = ifp->tstamp;
1100 spin_unlock_bh(&ifp->lock);
1101
eac55bf9
BB		 1102 regen_advance = idev->cnf.regen_max_retry *
1103 idev->cnf.dad_transmits *
1104 idev->nd_parms->retrans_time / HZ;
1da177e4 1105 write_unlock(&idev->lock);
95c385b4 1106
eac55bf9
BB		 1107 /* A temporary address is created only if this calculated Preferred
1108 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1109 * an implementation must not create a temporary address with a zero
1110 * Preferred Lifetime.
1111 */
1112 if (tmp_prefered_lft <= regen_advance) {
1113 in6_ifa_put(ifp);
1114 in6_dev_put(idev);
1115 ret = -1;
1116 goto out;
1117 }
1118
95c385b4
NH		 1119 addr_flags = IFA_F_TEMPORARY;
1120 /* set in addrconf_prefix_rcv() */
1121 if (ifp->flags & IFA_F_OPTIMISTIC)
1122 addr_flags |= IFA_F_OPTIMISTIC;
1123
1da177e4 1124 ift = !max_addresses ||
1ab1457c 1125 ipv6_count_addresses(idev) < max_addresses ?
88924753 1126 ipv6_add_addr(idev, &addr, tmp_plen, ipv6_addr_scope(&addr),
95c385b4 1127 addr_flags) : NULL;
3f0d2ba0 1128 if (IS_ERR_OR_NULL(ift)) {
1da177e4
LT		 1129 in6_ifa_put(ifp);
1130 in6_dev_put(idev);
f3213831 1131 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4
LT		 1132 tmpaddr = &addr;
1133 write_lock(&idev->lock);
1134 goto retry;
1135 }
1136
1137 spin_lock_bh(&ift->lock);
1138 ift->ifpub = ifp;
1139 ift->valid_lft = tmp_valid_lft;
1140 ift->prefered_lft = tmp_prefered_lft;
76f793e3 1141 ift->cstamp = now;
1da177e4
LT		 1142 ift->tstamp = tmp_tstamp;
1143 spin_unlock_bh(&ift->lock);
1144
cf22f9a2 1145 addrconf_dad_start(ift);
1da177e4
LT		 1146 in6_ifa_put(ift);
1147 in6_dev_put(idev);
1148out:
1149 return ret;
1150}
1151#endif
1152
1153/*
072047e4 1154 * Choose an appropriate source address (RFC3484)
1da177e4 1155 */
a9b05723
YH		 1156enum {
1157 IPV6_SADDR_RULE_INIT = 0,
1158 IPV6_SADDR_RULE_LOCAL,
1159 IPV6_SADDR_RULE_SCOPE,
1160 IPV6_SADDR_RULE_PREFERRED,
1161#ifdef CONFIG_IPV6_MIP6
1162 IPV6_SADDR_RULE_HOA,
1163#endif
1164 IPV6_SADDR_RULE_OIF,
1165 IPV6_SADDR_RULE_LABEL,
1166#ifdef CONFIG_IPV6_PRIVACY
1167 IPV6_SADDR_RULE_PRIVACY,
1168#endif
1169 IPV6_SADDR_RULE_ORCHID,
1170 IPV6_SADDR_RULE_PREFIX,
1171 IPV6_SADDR_RULE_MAX
1172};
1173
072047e4 1174struct ipv6_saddr_score {
a9b05723
YH		 1175 int rule;
1176 int addr_type;
1177 struct inet6_ifaddr *ifa;
1178 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1179 int scopedist;
1180 int matchlen;
072047e4
YH		 1181};
1182
a9b05723 1183struct ipv6_saddr_dst {
9acd9f3a 1184 const struct in6_addr *addr;
a9b05723
YH		 1185 int ifindex;
1186 int scope;
1187 int label;
7cbca67c 1188 unsigned int prefs;
a9b05723 1189};
072047e4 1190
b6f99a21 1191static inline int ipv6_saddr_preferred(int type)
1da177e4 1192{
45bb0060 1193 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1194 return 1;
1195 return 0;
1da177e4
LT		 1196}
1197
3de23255
BT		 1198static int ipv6_get_saddr_eval(struct net *net,
1199 struct ipv6_saddr_score *score,
a9b05723
YH		 1200 struct ipv6_saddr_dst *dst,
1201 int i)
1202{
1203 int ret;
1204
1205 if (i <= score->rule) {
1206 switch (i) {
1207 case IPV6_SADDR_RULE_SCOPE:
1208 ret = score->scopedist;
1209 break;
1210 case IPV6_SADDR_RULE_PREFIX:
1211 ret = score->matchlen;
1212 break;
1213 default:
1214 ret = !!test_bit(i, score->scorebits);
1215 }
1216 goto out;
1217 }
1218
1219 switch (i) {
1220 case IPV6_SADDR_RULE_INIT:
1221 /* Rule 0: remember if hiscore is not ready yet */
1222 ret = !!score->ifa;
1223 break;
1224 case IPV6_SADDR_RULE_LOCAL:
1225 /* Rule 1: Prefer same address */
1226 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1227 break;
1228 case IPV6_SADDR_RULE_SCOPE:
1229 /* Rule 2: Prefer appropriate scope
1230 *
1231 * ret
1232 * ^
1233 * -1 | d 15
1234 * ---+--+-+---> scope
1235 * |
1236 * | d is scope of the destination.
1237 * B-d | \
1238 * | \ <- smaller scope is better if
1239 * B-15 | \ if scope is enough for destinaion.
1240 * | ret = B - scope (-1 <= scope >= d <= 15).
1241 * d-C-1 | /
1242 * |/ <- greater is better
1243 * -C / if scope is not enough for destination.
1244 * /| ret = scope - C (-1 <= d < scope <= 15).
1245 *
1246 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1247 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1248 * Assume B = 0 and we get C > 29.
1249 */
1250 ret = __ipv6_addr_src_scope(score->addr_type);
1251 if (ret >= dst->scope)
1252 ret = -ret;
1253 else
1254 ret -= 128; /* 30 is enough */
1255 score->scopedist = ret;
1256 break;
1257 case IPV6_SADDR_RULE_PREFERRED:
1258 /* Rule 3: Avoid deprecated and optimistic addresses */
1259 ret = ipv6_saddr_preferred(score->addr_type) ||
1260 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1261 break;
1262#ifdef CONFIG_IPV6_MIP6
1263 case IPV6_SADDR_RULE_HOA:
7cbca67c 1264 {
a9b05723 1265 /* Rule 4: Prefer home address */
7cbca67c
YH		 1266 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1267 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1268 break;
7cbca67c 1269 }
a9b05723
YH		 1270#endif
1271 case IPV6_SADDR_RULE_OIF:
1272 /* Rule 5: Prefer outgoing interface */
1273 ret = (!dst->ifindex ||
1274 dst->ifindex == score->ifa->idev->dev->ifindex);
1275 break;
1276 case IPV6_SADDR_RULE_LABEL:
1277 /* Rule 6: Prefer matching label */
3de23255
BT		 1278 ret = ipv6_addr_label(net,
1279 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1280 score->ifa->idev->dev->ifindex) == dst->label;
1281 break;
1282#ifdef CONFIG_IPV6_PRIVACY
1283 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1284 {
a9b05723 1285 /* Rule 7: Prefer public address
25985edc 1286 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1287 */
7cbca67c
YH		 1288 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1289 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1290 score->ifa->idev->cnf.use_tempaddr >= 2;
1291 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1292 break;
7cbca67c 1293 }
a9b05723
YH		 1294#endif
1295 case IPV6_SADDR_RULE_ORCHID:
1296 /* Rule 8-: Prefer ORCHID vs ORCHID or
1297 * non-ORCHID vs non-ORCHID
1298 */
1299 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1300 ipv6_addr_orchid(dst->addr));
1301 break;
1302 case IPV6_SADDR_RULE_PREFIX:
1303 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1304 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1305 if (ret > score->ifa->prefix_len)
1306 ret = score->ifa->prefix_len;
1307 score->matchlen = ret;
a9b05723
YH		 1308 break;
1309 default:
1310 ret = 0;
1311 }
1312
1313 if (ret)
1314 __set_bit(i, score->scorebits);
1315 score->rule = i;
1316out:
1317 return ret;
1318}
1319
b3f644fc 1320int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1321 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1322 struct in6_addr *saddr)
1da177e4 1323{
a9b05723
YH		 1324 struct ipv6_saddr_score scores[2],
1325 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1326 struct ipv6_saddr_dst dst;
072047e4 1327 struct net_device *dev;
a9b05723 1328 int dst_type;
1da177e4 1329
a9b05723
YH		 1330 dst_type = __ipv6_addr_type(daddr);
1331 dst.addr = daddr;
1332 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1333 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1334 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1335 dst.prefs = prefs;
a9b05723
YH		 1336
1337 hiscore->rule = -1;
1338 hiscore->ifa = NULL;
1da177e4 1339
8814c4b5 1340 rcu_read_lock();
1da177e4 1341
c6d14c84 1342 for_each_netdev_rcu(net, dev) {
072047e4 1343 struct inet6_dev *idev;
072047e4 1344
a9b05723 1345 /* Candidate Source Address (section 4)
072047e4
YH		 1346 * - multicast and link-local destination address,
1347 * the set of candidate source address MUST only
1348 * include addresses assigned to interfaces
1349 * belonging to the same link as the outgoing
1350 * interface.
1351 * (- For site-local destination addresses, the
1352 * set of candidate source addresses MUST only
1353 * include addresses assigned to interfaces
1354 * belonging to the same site as the outgoing
1355 * interface.)
1356 */
a9b05723
YH		 1357 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1358 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1359 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1360 continue;
1da177e4 1361
1da177e4 1362 idev = __in6_dev_get(dev);
072047e4
YH		 1363 if (!idev)
1364 continue;
1365
1366 read_lock_bh(&idev->lock);
502a2ffd 1367 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1368 int i;
072047e4 1369
a9b05723 1370 /*
6b3ae80a
YH		 1371 * - Tentative Address (RFC2462 section 5.4)
1372 * - A tentative address is not considered
1373 * "assigned to an interface" in the traditional
95c385b4 1374 * sense, unless it is also flagged as optimistic.
6b3ae80a 1375 * - Candidate Source Address (section 4)
072047e4
YH		 1376 * - In any case, anycast addresses, multicast
1377 * addresses, and the unspecified address MUST
1378 * NOT be included in a candidate set.
1379 */
a9b05723
YH		 1380 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1381 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1382 continue;
a9b05723
YH		 1383
1384 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1385
1386 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1387 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1388 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1389 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1390 "assigned as unicast address on %s",
1391 dev->name);
1392 continue;
1393 }
1394
a9b05723
YH		 1395 score->rule = -1;
1396 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1397
1398 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1399 int minihiscore, miniscore;
1400
3de23255
BT		 1401 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1402 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1403
1404 if (minihiscore > miniscore) {
1405 if (i == IPV6_SADDR_RULE_SCOPE &&
1406 score->scopedist > 0) {
1407 /*
1408 * special case:
1409 * each remaining entry
1410 * has too small (not enough)
1411 * scope, because ifa entries
1412 * are sorted by their scope
1413 * values.
1414 */
1415 goto try_nextdev;
1416 }
1417 break;
1418 } else if (minihiscore < miniscore) {
a9b05723
YH		 1419 if (hiscore->ifa)
1420 in6_ifa_put(hiscore->ifa);
1421
1422 in6_ifa_hold(score->ifa);
1423
a0bffffc 1424 swap(hiscore, score);
a9b05723
YH		 1425
1426 /* restore our iterator */
1427 score->ifa = hiscore->ifa;
1428
1429 break;
1da177e4 1430 }
072047e4 1431 }
1da177e4 1432 }
a9b05723 1433try_nextdev:
072047e4 1434 read_unlock_bh(&idev->lock);
1da177e4 1435 }
8814c4b5 1436 rcu_read_unlock();
1da177e4 1437
a9b05723 1438 if (!hiscore->ifa)
072047e4 1439 return -EADDRNOTAVAIL;
1ab1457c 1440
4e3fd7a0 1441 *saddr = hiscore->ifa->addr;
a9b05723 1442 in6_ifa_put(hiscore->ifa);
072047e4 1443 return 0;
1da177e4 1444}
5e5f3f0f 1445EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1446
b7b1bfce
HFS		 1447static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1448 unsigned char banned_flags)
1449{
1450 struct inet6_ifaddr *ifp;
1451 int err = -EADDRNOTAVAIL;
1452
1453 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1454 if (ifp->scope == IFA_LINK &&
1455 !(ifp->flags & banned_flags)) {
1456 *addr = ifp->addr;
1457 err = 0;
1458 break;
1459 }
1460 }
1461 return err;
1462}
1463
95c385b4
NH		 1464int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1465 unsigned char banned_flags)
1da177e4
LT		 1466{
1467 struct inet6_dev *idev;
1468 int err = -EADDRNOTAVAIL;
1469
8814c4b5 1470 rcu_read_lock();
e21e8467
SH		 1471 idev = __in6_dev_get(dev);
1472 if (idev) {
1da177e4 1473 read_lock_bh(&idev->lock);
b7b1bfce 1474 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1475 read_unlock_bh(&idev->lock);
1476 }
8814c4b5 1477 rcu_read_unlock();
1da177e4
LT		 1478 return err;
1479}
1480
1481static int ipv6_count_addresses(struct inet6_dev *idev)
1482{
1483 int cnt = 0;
1484 struct inet6_ifaddr *ifp;
1485
1486 read_lock_bh(&idev->lock);
502a2ffd 1487 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1488 cnt++;
1489 read_unlock_bh(&idev->lock);
1490 return cnt;
1491}
1492
b71d1d42 1493int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1494 const struct net_device *dev, int strict)
1da177e4 1495{
eedf042a 1496 struct inet6_ifaddr *ifp;
ddbe5032 1497 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1498
5c578aed 1499 rcu_read_lock_bh();
b67bfe0d 1500 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1501 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1502 continue;
1da177e4 1503 if (ipv6_addr_equal(&ifp->addr, addr) &&
eedf042a
SH		 1504 !(ifp->flags&IFA_F_TENTATIVE) &&
1505 (dev == NULL || ifp->idev->dev == dev ||
1506 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1507 rcu_read_unlock_bh();
1508 return 1;
1da177e4
LT		 1509 }
1510 }
5c578aed 1511
eedf042a
SH		 1512 rcu_read_unlock_bh();
1513 return 0;
1da177e4 1514}
7159039a
YH		 1515EXPORT_SYMBOL(ipv6_chk_addr);
1516
3e81c6da
DM		 1517static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1518 struct net_device *dev)
1da177e4 1519{
ddbe5032 1520 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1521 struct inet6_ifaddr *ifp;
1da177e4 1522
b67bfe0d 1523 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1524 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1525 continue;
1da177e4
LT		 1526 if (ipv6_addr_equal(&ifp->addr, addr)) {
1527 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1528 return true;
1da177e4
LT		 1529 }
1530 }
3e81c6da 1531 return false;
1da177e4
LT		 1532}
1533
b71d1d42 1534int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1535{
1536 struct inet6_dev *idev;
1537 struct inet6_ifaddr *ifa;
1538 int onlink;
1539
1540 onlink = 0;
1541 rcu_read_lock();
1542 idev = __in6_dev_get(dev);
1543 if (idev) {
1544 read_lock_bh(&idev->lock);
502a2ffd 1545 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1546 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1547 ifa->prefix_len);
1548 if (onlink)
1549 break;
1550 }
1551 read_unlock_bh(&idev->lock);
1552 }
1553 rcu_read_unlock();
1554 return onlink;
1555}
52eeeb84
YH		 1556EXPORT_SYMBOL(ipv6_chk_prefix);
1557
9acd9f3a 1558struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1559 struct net_device *dev, int strict)
1da177e4 1560{
b79d1d54 1561 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1562 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1563
5c578aed 1564 rcu_read_lock_bh();
b67bfe0d 1565 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1566 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1567 continue;
1da177e4
LT		 1568 if (ipv6_addr_equal(&ifp->addr, addr)) {
1569 if (dev == NULL || ifp->idev->dev == dev ||
1570 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1571 result = ifp;
1da177e4
LT		 1572 in6_ifa_hold(ifp);
1573 break;
1574 }
1575 }
1576 }
5c578aed 1577 rcu_read_unlock_bh();
1da177e4 1578
b79d1d54 1579 return result;
1da177e4
LT		 1580}
1581
1da177e4
LT		 1582/* Gets referenced address, destroys ifaddr */
1583
cc411d0b 1584static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1585{
1da177e4
LT		 1586 if (ifp->flags&IFA_F_PERMANENT) {
1587 spin_lock_bh(&ifp->lock);
b7b1bfce 1588 addrconf_del_dad_timer(ifp);
1da177e4 1589 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1590 if (dad_failed)
1591 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1592 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1593 if (dad_failed)
1594 ipv6_ifa_notify(0, ifp);
1da177e4
LT		 1595 in6_ifa_put(ifp);
1596#ifdef CONFIG_IPV6_PRIVACY
1597 } else if (ifp->flags&IFA_F_TEMPORARY) {
1598 struct inet6_ifaddr *ifpub;
1599 spin_lock_bh(&ifp->lock);
1600 ifpub = ifp->ifpub;
1601 if (ifpub) {
1602 in6_ifa_hold(ifpub);
1603 spin_unlock_bh(&ifp->lock);
1604 ipv6_create_tempaddr(ifpub, ifp);
1605 in6_ifa_put(ifpub);
1606 } else {
1607 spin_unlock_bh(&ifp->lock);
1608 }
1609 ipv6_del_addr(ifp);
1610#endif
1611 } else
1612 ipv6_del_addr(ifp);
1613}
1614
f2344a13
HX		 1615static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1616{
1617 int err = -ENOENT;
1618
1619 spin_lock(&ifp->state_lock);
1620 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1621 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1622 err = 0;
1623 }
1624 spin_unlock(&ifp->state_lock);
1625
1626 return err;
1627}
1628
3c21edbd
YH		 1629void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1630{
1b34be74 1631 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1632
853dc2e0
UB		 1633 if (addrconf_dad_end(ifp)) {
1634 in6_ifa_put(ifp);
f2344a13 1635 return;
853dc2e0 1636 }
f2344a13 1637
e87cc472
JP		 1638 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1639 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1640
1b34be74
YH		 1641 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1642 struct in6_addr addr;
1643
1644 addr.s6_addr32[0] = htonl(0xfe800000);
1645 addr.s6_addr32[1] = 0;
1646
1647 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1648 ipv6_addr_equal(&ifp->addr, &addr)) {
1649 /* DAD failed for link-local based on MAC address */
1650 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1651
f3213831 1652 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1653 ifp->idev->dev->name);
1b34be74
YH		 1654 }
1655 }
1656
cc411d0b 1657 addrconf_dad_stop(ifp, 1);
3c21edbd 1658}
1da177e4
LT		 1659
1660/* Join to solicited addr multicast group. */
1661
b71d1d42 1662void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1663{
1664 struct in6_addr maddr;
1665
1666 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1667 return;
1668
1669 addrconf_addr_solict_mult(addr, &maddr);
1670 ipv6_dev_mc_inc(dev, &maddr);
1671}
1672
b71d1d42 1673void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1674{
1675 struct in6_addr maddr;
1676
1677 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1678 return;
1679
1680 addrconf_addr_solict_mult(addr, &maddr);
1681 __ipv6_dev_mc_dec(idev, &maddr);
1682}
1683
20380731 1684static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1685{
1686 struct in6_addr addr;
2bda8a0c
BM		 1687 if (ifp->prefix_len == 127) /* RFC 6164 */
1688 return;
1da177e4
LT		 1689 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1690 if (ipv6_addr_any(&addr))
1691 return;
1692 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1693}
1694
20380731 1695static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1696{
1697 struct in6_addr addr;
32019e65
YH		 1698 if (ifp->prefix_len == 127) /* RFC 6164 */
1699 return;
1da177e4
LT		 1700 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1701 if (ipv6_addr_any(&addr))
1702 return;
1703 __ipv6_dev_ac_dec(ifp->idev, &addr);
1704}
1705
073a8e0e
YH		 1706static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1707{
1708 if (dev->addr_len != ETH_ALEN)
1709 return -1;
1710 memcpy(eui, dev->dev_addr, 3);
1711 memcpy(eui + 5, dev->dev_addr + 3, 3);
1712
1713 /*
1714 * The zSeries OSA network cards can be shared among various
1715 * OS instances, but the OSA cards have only one MAC address.
1716 * This leads to duplicate address conflicts in conjunction
1717 * with IPv6 if more than one instance uses the same card.
1718 *
1719 * The driver for these cards can deliver a unique 16-bit
1720 * identifier for each instance sharing the same card. It is
1721 * placed instead of 0xFFFE in the interface identifier. The
1722 * "u" bit of the interface identifier is not inverted in this
1723 * case. Hence the resulting interface identifier has local
1724 * scope according to RFC2373.
1725 */
1726 if (dev->dev_id) {
1727 eui[3] = (dev->dev_id >> 8) & 0xFF;
1728 eui[4] = dev->dev_id & 0xFF;
1729 } else {
1730 eui[3] = 0xFF;
1731 eui[4] = 0xFE;
1732 eui[0] ^= 2;
1733 }
1734 return 0;
1735}
1736
06a4c1c5 1737static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1738{
1739 if (dev->addr_len != IEEE802154_ADDR_LEN)
1740 return -1;
1741 memcpy(eui, dev->dev_addr, 8);
5e98a36e 1742 eui[0] ^= 2;
06a4c1c5 1743 return 0;
1744}
1745
cb6bf355
YH		 1746static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1747{
1748 union fwnet_hwaddr *ha;
1749
1750 if (dev->addr_len != FWNET_ALEN)
1751 return -1;
1752
1753 ha = (union fwnet_hwaddr *)dev->dev_addr;
1754
1755 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1756 eui[0] ^= 2;
1757 return 0;
1758}
1759
073a8e0e
YH		 1760static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1761{
1762 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1763 if (dev->addr_len != ARCNET_ALEN)
1764 return -1;
1765 memset(eui, 0, 7);
8e5e8f30 1766 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1767 return 0;
1768}
1769
1770static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1771{
1772 if (dev->addr_len != INFINIBAND_ALEN)
1773 return -1;
1774 memcpy(eui, dev->dev_addr + 12, 8);
1775 eui[0] |= 2;
1776 return 0;
1777}
1778
c61393ea 1779static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1780{
9af28511
SH		 1781 if (addr == 0)
1782 return -1;
dfd982ba
YH		 1783 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1784 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1785 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1786 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1787 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1788 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1789 eui[1] = 0;
1790 eui[2] = 0x5E;
1791 eui[3] = 0xFE;
1792 memcpy(eui + 4, &addr, 4);
1793 return 0;
1794}
dfd982ba
YH		 1795
1796static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1797{
1798 if (dev->priv_flags & IFF_ISATAP)
1799 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1800 return -1;
1801}
1802
aee80b54 1803static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1804{
1805 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1806}
1807
1da177e4
LT		 1808static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1809{
1810 switch (dev->type) {
1811 case ARPHRD_ETHER:
1812 case ARPHRD_FDDI:
073a8e0e 1813 return addrconf_ifid_eui48(eui, dev);
1da177e4 1814 case ARPHRD_ARCNET:
073a8e0e 1815 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1816 case ARPHRD_INFINIBAND:
073a8e0e 1817 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1818 case ARPHRD_SIT:
dfd982ba 1819 return addrconf_ifid_sit(eui, dev);
aee80b54 1820 case ARPHRD_IPGRE:
1821 return addrconf_ifid_gre(eui, dev);
06a4c1c5 1822 case ARPHRD_IEEE802154:
1823 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 1824 case ARPHRD_IEEE1394:
1825 return addrconf_ifid_ieee1394(eui, dev);
1da177e4
LT		 1826 }
1827 return -1;
1828}
1829
1830static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1831{
1832 int err = -1;
1833 struct inet6_ifaddr *ifp;
1834
1835 read_lock_bh(&idev->lock);
502a2ffd 1836 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 1837 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1838 memcpy(eui, ifp->addr.s6_addr+8, 8);
1839 err = 0;
1840 break;
1841 }
1842 }
1843 read_unlock_bh(&idev->lock);
1844 return err;
1845}
1846
1847#ifdef CONFIG_IPV6_PRIVACY
1848/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 1849static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 1850{
1da177e4 1851regen:
955189ef 1852 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1853 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1854
1855 /*
1856 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1857 * check if generated address is not inappropriate
1858 *
1859 * - Reserved subnet anycast (RFC 2526)
1860 * 11111101 11....11 1xxxxxxx
c7dc89c0 1861 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1862 * 00-00-5E-FE-xx-xx-xx-xx
1863 * - value 0
1864 * - XXX: already assigned to an address on the device
1865 */
1ab1457c 1866 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1867 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1868 (idev->rndid[7]&0x80))
1869 goto regen;
1870 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1871 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1872 goto regen;
1873 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1874 goto regen;
1875 }
1da177e4
LT		 1876}
1877
1878static void ipv6_regen_rndid(unsigned long data)
1879{
1880 struct inet6_dev *idev = (struct inet6_dev *) data;
1881 unsigned long expires;
1882
8814c4b5 1883 rcu_read_lock_bh();
1da177e4
LT		 1884 write_lock_bh(&idev->lock);
1885
1886 if (idev->dead)
1887 goto out;
1888
eb7e0575 1889 __ipv6_regen_rndid(idev);
1ab1457c 1890
1da177e4 1891 expires = jiffies +
1ab1457c 1892 idev->cnf.temp_prefered_lft * HZ -
784e2710
BH		 1893 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1894 idev->cnf.max_desync_factor * HZ;
1da177e4 1895 if (time_before(expires, jiffies)) {
f3213831
JP		 1896 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1897 __func__, idev->dev->name);
1da177e4
LT		 1898 goto out;
1899 }
1900
1901 if (!mod_timer(&idev->regen_timer, expires))
1902 in6_dev_hold(idev);
1903
1904out:
1905 write_unlock_bh(&idev->lock);
8814c4b5 1906 rcu_read_unlock_bh();
1da177e4
LT		 1907 in6_dev_put(idev);
1908}
1909
eb7e0575 1910static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 1911{
1da177e4 1912 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 1913 __ipv6_regen_rndid(idev);
1da177e4
LT		 1914}
1915#endif
1916
1917/*
1918 * Add prefix route.
1919 */
1920
1921static void
1922addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1923 unsigned long expires, u32 flags)
1da177e4 1924{
86872cb5
TG		 1925 struct fib6_config cfg = {
1926 .fc_table = RT6_TABLE_PREFIX,
1927 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1928 .fc_ifindex = dev->ifindex,
1929 .fc_expires = expires,
1930 .fc_dst_len = plen,
1931 .fc_flags = RTF_UP | flags,
c346dca1 1932 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1933 .fc_protocol = RTPROT_KERNEL,
86872cb5 1934 };
1da177e4 1935
4e3fd7a0 1936 cfg.fc_dst = *pfx;
1da177e4
LT		 1937
1938 /* Prevent useless cloning on PtP SIT.
1939 This thing is done here expecting that the whole
1940 class of non-broadcast devices need not cloning.
1941 */
07a93626 1942#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 1943 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1944 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1945#endif
1da177e4 1946
86872cb5 1947 ip6_route_add(&cfg);
1da177e4
LT		 1948}
1949
14ef37b6
AH		 1950
1951static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1952 int plen,
1953 const struct net_device *dev,
1954 u32 flags, u32 noflags)
1955{
1956 struct fib6_node *fn;
1957 struct rt6_info *rt = NULL;
1958 struct fib6_table *table;
1959
1960 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1961 if (table == NULL)
1962 return NULL;
1963
5744dd9b 1964 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 1965 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1966 if (!fn)
1967 goto out;
1968 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 1969 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 1970 continue;
1971 if ((rt->rt6i_flags & flags) != flags)
1972 continue;
85da53bf 1973 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 1974 continue;
1975 dst_hold(&rt->dst);
1976 break;
1977 }
1978out:
5744dd9b 1979 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 1980 return rt;
1981}
1982
1983
1da177e4
LT		 1984/* Create "default" multicast route to the interface */
1985
1986static void addrconf_add_mroute(struct net_device *dev)
1987{
86872cb5
TG		 1988 struct fib6_config cfg = {
1989 .fc_table = RT6_TABLE_LOCAL,
1990 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1991 .fc_ifindex = dev->ifindex,
1992 .fc_dst_len = 8,
1993 .fc_flags = RTF_UP,
c346dca1 1994 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1995 };
1996
1997 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1998
1999 ip6_route_add(&cfg);
1da177e4
LT		 2000}
2001
07a93626 2002#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2003static void sit_route_add(struct net_device *dev)
2004{
86872cb5
TG		 2005 struct fib6_config cfg = {
2006 .fc_table = RT6_TABLE_MAIN,
2007 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2008 .fc_ifindex = dev->ifindex,
2009 .fc_dst_len = 96,
2010 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 2011 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 2012 };
1da177e4
LT		 2013
2014 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 2015 ip6_route_add(&cfg);
1da177e4 2016}
0be669bb 2017#endif
1da177e4 2018
1da177e4
LT		 2019static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2020{
2021 struct inet6_dev *idev;
2022
2023 ASSERT_RTNL();
2024
e21e8467
SH		 2025 idev = ipv6_find_idev(dev);
2026 if (!idev)
64e724f6
BH		 2027 return ERR_PTR(-ENOBUFS);
2028
2029 if (idev->cnf.disable_ipv6)
2030 return ERR_PTR(-EACCES);
1da177e4
LT		 2031
2032 /* Add default multicast route */
4af04aba
LW		 2033 if (!(dev->flags & IFF_LOOPBACK))
2034 addrconf_add_mroute(dev);
1da177e4 2035
1da177e4
LT		 2036 return idev;
2037}
2038
e6bff995 2039void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2040{
2041 struct prefix_info *pinfo;
2042 __u32 valid_lft;
2043 __u32 prefered_lft;
2044 int addr_type;
1da177e4 2045 struct inet6_dev *in6_dev;
56d417b1 2046 struct net *net = dev_net(dev);
1da177e4
LT		 2047
2048 pinfo = (struct prefix_info *) opt;
1ab1457c 2049
1da177e4
LT		 2050 if (len < sizeof(struct prefix_info)) {
2051 ADBG(("addrconf: prefix option too short\n"));
2052 return;
2053 }
1ab1457c 2054
1da177e4
LT		 2055 /*
2056 * Validation checks ([ADDRCONF], page 19)
2057 */
2058
2059 addr_type = ipv6_addr_type(&pinfo->prefix);
2060
2061 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2062 return;
2063
2064 valid_lft = ntohl(pinfo->valid);
2065 prefered_lft = ntohl(pinfo->prefered);
2066
2067 if (prefered_lft > valid_lft) {
e87cc472 2068 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2069 return;
2070 }
2071
2072 in6_dev = in6_dev_get(dev);
2073
2074 if (in6_dev == NULL) {
e87cc472
JP		 2075 net_dbg_ratelimited("addrconf: device %s not configured\n",
2076 dev->name);
1da177e4
LT		 2077 return;
2078 }
2079
2080 /*
2081 * Two things going on here:
2082 * 1) Add routes for on-link prefixes
2083 * 2) Configure prefixes with the auto flag set
2084 */
2085
4bed72e4
YH		 2086 if (pinfo->onlink) {
2087 struct rt6_info *rt;
2088 unsigned long rt_expires;
2089
6f704992
YH		 2090 /* Avoid arithmetic overflow. Really, we could
2091 * save rt_expires in seconds, likely valid_lft,
2092 * but it would require division in fib gc, that it
2093 * not good.
2094 */
4bed72e4
YH		 2095 if (HZ > USER_HZ)
2096 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2097 else
2098 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2099
4bed72e4
YH		 2100 if (addrconf_finite_timeout(rt_expires))
2101 rt_expires *= HZ;
1da177e4 2102
14ef37b6
AH		 2103 rt = addrconf_get_prefix_route(&pinfo->prefix,
2104 pinfo->prefix_len,
2105 dev,
2106 RTF_ADDRCONF | RTF_PREFIX_RT,
2107 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2108
14ef37b6 2109 if (rt) {
6f704992
YH		 2110 /* Autoconf prefix route */
2111 if (valid_lft == 0) {
2112 ip6_del_rt(rt);
2113 rt = NULL;
4bed72e4 2114 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2115 /* not infinity */
1716a961 2116 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2117 } else {
1716a961 2118 rt6_clean_expires(rt);
1da177e4
LT		 2119 }
2120 } else if (valid_lft) {
6f704992 2121 clock_t expires = 0;
4bed72e4
YH		 2122 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2123 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2124 /* not infinity */
2125 flags |= RTF_EXPIRES;
2126 expires = jiffies_to_clock_t(rt_expires);
2127 }
1da177e4 2128 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2129 dev, expires, flags);
1da177e4 2130 }
94e187c0 2131 ip6_rt_put(rt);
1da177e4
LT		 2132 }
2133
2134 /* Try to figure out our local address for this prefix */
2135
2136 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2137 struct inet6_ifaddr *ifp;
1da177e4
LT		 2138 struct in6_addr addr;
2139 int create = 0, update_lft = 0;
617fe29d 2140 bool tokenized = false;
1da177e4
LT		 2141
2142 if (pinfo->prefix_len == 64) {
2143 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2144
2145 if (!ipv6_addr_any(&in6_dev->token)) {
2146 read_lock_bh(&in6_dev->lock);
2147 memcpy(addr.s6_addr + 8,
2148 in6_dev->token.s6_addr + 8, 8);
2149 read_unlock_bh(&in6_dev->lock);
617fe29d 2150 tokenized = true;
f53adae4
DB		 2151 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2152 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1da177e4
LT		 2153 in6_dev_put(in6_dev);
2154 return;
2155 }
2156 goto ok;
2157 }
e87cc472
JP		 2158 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2159 pinfo->prefix_len);
1da177e4
LT		 2160 in6_dev_put(in6_dev);
2161 return;
2162
2163ok:
2164
53b7997f 2165 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 2166
2167 if (ifp == NULL && valid_lft) {
2168 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2169 u32 addr_flags = 0;
2170
2171#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2172 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2173 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 2174 addr_flags = IFA_F_OPTIMISTIC;
2175#endif
1da177e4
LT		 2176
2177 /* Do not allow to create too much of autoconfigured
2178 * addresses; this would be too easy way to crash kernel.
2179 */
2180 if (!max_addresses ||
2181 ipv6_count_addresses(in6_dev) < max_addresses)
2182 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 2183 addr_type&IPV6_ADDR_SCOPE_MASK,
2184 addr_flags);
1da177e4 2185
3f0d2ba0 2186 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2187 in6_dev_put(in6_dev);
2188 return;
2189 }
2190
2191 update_lft = create = 1;
2192 ifp->cstamp = jiffies;
617fe29d 2193 ifp->tokenized = tokenized;
cf22f9a2 2194 addrconf_dad_start(ifp);
1da177e4
LT		 2195 }
2196
2197 if (ifp) {
2198 int flags;
2199 unsigned long now;
2200#ifdef CONFIG_IPV6_PRIVACY
2201 struct inet6_ifaddr *ift;
2202#endif
2203 u32 stored_lft;
2204
2205 /* update lifetime (RFC2462 5.5.3 e) */
2206 spin_lock(&ifp->lock);
2207 now = jiffies;
2208 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2209 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2210 else
2211 stored_lft = 0;
2212 if (!update_lft && stored_lft) {
2213 if (valid_lft > MIN_VALID_LIFETIME ||
2214 valid_lft > stored_lft)
2215 update_lft = 1;
2216 else if (stored_lft <= MIN_VALID_LIFETIME) {
2217 /* valid_lft <= stored_lft is always true */
a1ed0526
BH		 2218 /*
2219 * RFC 4862 Section 5.5.3e:
2220 * "Note that the preferred lifetime of
2221 * the corresponding address is always
2222 * reset to the Preferred Lifetime in
2223 * the received Prefix Information
2224 * option, regardless of whether the
2225 * valid lifetime is also reset or
2226 * ignored."
2227 *
2228 * So if the preferred lifetime in
2229 * this advertisement is different
2230 * than what we have stored, but the
2231 * valid lifetime is invalid, just
2232 * reset prefered_lft.
2233 *
2234 * We must set the valid lifetime
2235 * to the stored lifetime since we'll
2236 * be updating the timestamp below,
2237 * else we'll set it back to the
25985edc 2238 * minimum.
a1ed0526
BH		 2239 */
2240 if (prefered_lft != ifp->prefered_lft) {
2241 valid_lft = stored_lft;
2242 update_lft = 1;
2243 }
1da177e4
LT		 2244 } else {
2245 valid_lft = MIN_VALID_LIFETIME;
2246 if (valid_lft < prefered_lft)
2247 prefered_lft = valid_lft;
2248 update_lft = 1;
2249 }
2250 }
2251
2252 if (update_lft) {
2253 ifp->valid_lft = valid_lft;
2254 ifp->prefered_lft = prefered_lft;
2255 ifp->tstamp = now;
2256 flags = ifp->flags;
2257 ifp->flags &= ~IFA_F_DEPRECATED;
2258 spin_unlock(&ifp->lock);
2259
2260 if (!(flags&IFA_F_TENTATIVE))
2261 ipv6_ifa_notify(0, ifp);
2262 } else
2263 spin_unlock(&ifp->lock);
2264
2265#ifdef CONFIG_IPV6_PRIVACY
2266 read_lock_bh(&in6_dev->lock);
2267 /* update all temporary addresses in the list */
76f793e3
LC		 2268 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2269 tmp_list) {
2270 int age, max_valid, max_prefered;
2271
c6fbfac2
BB		 2272 if (ifp != ift->ifpub)
2273 continue;
2274
76f793e3
LC		 2275 /*
2276 * RFC 4941 section 3.3:
2277 * If a received option will extend the lifetime
2278 * of a public address, the lifetimes of
2279 * temporary addresses should be extended,
2280 * subject to the overall constraint that no
2281 * temporary addresses should ever remain
2282 * "valid" or "preferred" for a time longer than
2283 * (TEMP_VALID_LIFETIME) or
2284 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2285 * respectively.
2286 */
2287 age = (now - ift->cstamp) / HZ;
2288 max_valid = in6_dev->cnf.temp_valid_lft - age;
2289 if (max_valid < 0)
2290 max_valid = 0;
2291
2292 max_prefered = in6_dev->cnf.temp_prefered_lft -
2293 in6_dev->cnf.max_desync_factor -
2294 age;
2295 if (max_prefered < 0)
2296 max_prefered = 0;
2297
2298 if (valid_lft > max_valid)
2299 valid_lft = max_valid;
2300
2301 if (prefered_lft > max_prefered)
2302 prefered_lft = max_prefered;
2303
1da177e4
LT		 2304 spin_lock(&ift->lock);
2305 flags = ift->flags;
76f793e3
LC		 2306 ift->valid_lft = valid_lft;
2307 ift->prefered_lft = prefered_lft;
2308 ift->tstamp = now;
2309 if (prefered_lft > 0)
2310 ift->flags &= ~IFA_F_DEPRECATED;
2311
1da177e4
LT		 2312 spin_unlock(&ift->lock);
2313 if (!(flags&IFA_F_TENTATIVE))
2314 ipv6_ifa_notify(0, ift);
2315 }
2316
aed65501 2317 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
1da177e4 2318 /*
76f793e3
LC		 2319 * When a new public address is created as
2320 * described in [ADDRCONF], also create a new
2321 * temporary address. Also create a temporary
2322 * address if it's enabled but no temporary
2323 * address currently exists.
1da177e4 2324 */
1ab1457c 2325 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 2326 ipv6_create_tempaddr(ifp, NULL);
2327 } else {
2328 read_unlock_bh(&in6_dev->lock);
2329 }
2330#endif
2331 in6_ifa_put(ifp);
2332 addrconf_verify(0);
2333 }
2334 }
2335 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2336 in6_dev_put(in6_dev);
2337}
2338
2339/*
2340 * Set destination address.
2341 * Special case for SIT interfaces where we create a new "virtual"
2342 * device.
2343 */
af284937 2344int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2345{
2346 struct in6_ifreq ireq;
2347 struct net_device *dev;
2348 int err = -EINVAL;
2349
2350 rtnl_lock();
2351
2352 err = -EFAULT;
2353 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2354 goto err_exit;
2355
af284937 2356 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2357
2358 err = -ENODEV;
2359 if (dev == NULL)
2360 goto err_exit;
2361
07a93626 2362#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2363 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2364 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2365 struct ifreq ifr;
1da177e4
LT		 2366 struct ip_tunnel_parm p;
2367
2368 err = -EADDRNOTAVAIL;
2369 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2370 goto err_exit;
2371
2372 memset(&p, 0, sizeof(p));
2373 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2374 p.iph.saddr = 0;
2375 p.iph.version = 4;
2376 p.iph.ihl = 5;
2377 p.iph.protocol = IPPROTO_IPV6;
2378 p.iph.ttl = 64;
d20b3109 2379 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2380
5bc3eb7e
SH		 2381 if (ops->ndo_do_ioctl) {
2382 mm_segment_t oldfs = get_fs();
2383
2384 set_fs(KERNEL_DS);
2385 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2386 set_fs(oldfs);
2387 } else
2388 err = -EOPNOTSUPP;
1da177e4
LT		 2389
2390 if (err == 0) {
2391 err = -ENOBUFS;
af284937
DL		 2392 dev = __dev_get_by_name(net, p.name);
2393 if (!dev)
1da177e4
LT		 2394 goto err_exit;
2395 err = dev_open(dev);
2396 }
2397 }
0be669bb 2398#endif
1da177e4
LT		 2399
2400err_exit:
2401 rtnl_unlock();
2402 return err;
2403}
2404
2405/*
2406 * Manual configuration of address on an interface
2407 */
b71d1d42 2408static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
caeaba79 2409 const struct in6_addr *peer_pfx,
24ef0da7 2410 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2411 __u32 valid_lft)
1da177e4
LT		 2412{
2413 struct inet6_ifaddr *ifp;
2414 struct inet6_dev *idev;
2415 struct net_device *dev;
2416 int scope;
6f704992
YH		 2417 u32 flags;
2418 clock_t expires;
4bed72e4 2419 unsigned long timeout;
1da177e4
LT		 2420
2421 ASSERT_RTNL();
1ab1457c 2422
24ef0da7
TG		 2423 if (plen > 128)
2424 return -EINVAL;
2425
0778769d
NT		 2426 /* check the lifetime */
2427 if (!valid_lft || prefered_lft > valid_lft)
2428 return -EINVAL;
2429
af284937
DL		 2430 dev = __dev_get_by_index(net, ifindex);
2431 if (!dev)
1da177e4 2432 return -ENODEV;
1ab1457c 2433
64e724f6
BH		 2434 idev = addrconf_add_dev(dev);
2435 if (IS_ERR(idev))
2436 return PTR_ERR(idev);
1da177e4
LT		 2437
2438 scope = ipv6_addr_scope(pfx);
2439
4bed72e4
YH		 2440 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2441 if (addrconf_finite_timeout(timeout)) {
2442 expires = jiffies_to_clock_t(timeout * HZ);
2443 valid_lft = timeout;
6f704992 2444 flags = RTF_EXPIRES;
4bed72e4
YH		 2445 } else {
2446 expires = 0;
2447 flags = 0;
2448 ifa_flags |= IFA_F_PERMANENT;
6f704992 2449 }
0778769d 2450
4bed72e4
YH		 2451 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2452 if (addrconf_finite_timeout(timeout)) {
2453 if (timeout == 0)
2454 ifa_flags |= IFA_F_DEPRECATED;
2455 prefered_lft = timeout;
2456 }
0778769d
NT		 2457
2458 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2459
1da177e4 2460 if (!IS_ERR(ifp)) {
06aebfb7 2461 spin_lock_bh(&ifp->lock);
0778769d
NT		 2462 ifp->valid_lft = valid_lft;
2463 ifp->prefered_lft = prefered_lft;
2464 ifp->tstamp = jiffies;
caeaba79
ND		 2465 if (peer_pfx)
2466 ifp->peer_addr = *peer_pfx;
06aebfb7 2467 spin_unlock_bh(&ifp->lock);
0778769d 2468
46d48046 2469 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2470 expires, flags);
95c385b4
NH		 2471 /*
2472 * Note that section 3.1 of RFC 4429 indicates
2473 * that the Optimistic flag should not be set for
2474 * manually configured addresses
2475 */
cf22f9a2 2476 addrconf_dad_start(ifp);
1da177e4 2477 in6_ifa_put(ifp);
0778769d 2478 addrconf_verify(0);
1da177e4
LT		 2479 return 0;
2480 }
2481
2482 return PTR_ERR(ifp);
2483}
2484
b71d1d42 2485static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2486 unsigned int plen)
1da177e4
LT		 2487{
2488 struct inet6_ifaddr *ifp;
2489 struct inet6_dev *idev;
2490 struct net_device *dev;
1ab1457c 2491
24ef0da7
TG		 2492 if (plen > 128)
2493 return -EINVAL;
2494
af284937
DL		 2495 dev = __dev_get_by_index(net, ifindex);
2496 if (!dev)
1da177e4
LT		 2497 return -ENODEV;
2498
2499 if ((idev = __in6_dev_get(dev)) == NULL)
2500 return -ENXIO;
2501
2502 read_lock_bh(&idev->lock);
502a2ffd 2503 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2504 if (ifp->prefix_len == plen &&
2505 ipv6_addr_equal(pfx, &ifp->addr)) {
2506 in6_ifa_hold(ifp);
2507 read_unlock_bh(&idev->lock);
1ab1457c 2508
1da177e4 2509 ipv6_del_addr(ifp);
1da177e4
LT		 2510 return 0;
2511 }
2512 }
2513 read_unlock_bh(&idev->lock);
2514 return -EADDRNOTAVAIL;
2515}
2516
2517
af284937 2518int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2519{
2520 struct in6_ifreq ireq;
2521 int err;
1ab1457c 2522
af31f412 2523 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2524 return -EPERM;
1ab1457c 2525
1da177e4
LT		 2526 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2527 return -EFAULT;
2528
2529 rtnl_lock();
caeaba79 2530 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2531 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2532 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2533 rtnl_unlock();
2534 return err;
2535}
2536
af284937 2537int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2538{
2539 struct in6_ifreq ireq;
2540 int err;
1ab1457c 2541
af31f412 2542 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2543 return -EPERM;
2544
2545 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2546 return -EFAULT;
2547
2548 rtnl_lock();
af284937
DL		 2549 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2550 ireq.ifr6_prefixlen);
1da177e4
LT		 2551 rtnl_unlock();
2552 return err;
2553}
2554
b5f348e5
IJ		 2555static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2556 int plen, int scope)
2557{
2558 struct inet6_ifaddr *ifp;
2559
2560 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2561 if (!IS_ERR(ifp)) {
2562 spin_lock_bh(&ifp->lock);
2563 ifp->flags &= ~IFA_F_TENTATIVE;
2564 spin_unlock_bh(&ifp->lock);
2565 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2566 in6_ifa_put(ifp);
2567 }
2568}
2569
07a93626 2570#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2571static void sit_add_v4_addrs(struct inet6_dev *idev)
2572{
1da177e4
LT		 2573 struct in6_addr addr;
2574 struct net_device *dev;
c346dca1 2575 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2576 int scope;
2577
2578 ASSERT_RTNL();
2579
2580 memset(&addr, 0, sizeof(struct in6_addr));
2581 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2582
2583 if (idev->dev->flags&IFF_POINTOPOINT) {
2584 addr.s6_addr32[0] = htonl(0xfe800000);
2585 scope = IFA_LINK;
2586 } else {
2587 scope = IPV6_ADDR_COMPATv4;
2588 }
2589
2590 if (addr.s6_addr32[3]) {
b5f348e5 2591 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2592 return;
2593 }
2594
6fda7350 2595 for_each_netdev(net, dev) {
8e5e8f30 2596 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2597 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2598 struct in_ifaddr *ifa;
1da177e4
LT		 2599
2600 int flag = scope;
2601
2602 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2603 int plen;
2604
2605 addr.s6_addr32[3] = ifa->ifa_local;
2606
2607 if (ifa->ifa_scope == RT_SCOPE_LINK)
2608 continue;
2609 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2610 if (idev->dev->flags&IFF_POINTOPOINT)
2611 continue;
2612 flag |= IFA_HOST;
2613 }
2614 if (idev->dev->flags&IFF_POINTOPOINT)
2615 plen = 64;
2616 else
2617 plen = 96;
2618
b5f348e5 2619 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2620 }
2621 }
1ab1457c 2622 }
1da177e4 2623}
0be669bb 2624#endif
1da177e4
LT		 2625
2626static void init_loopback(struct net_device *dev)
2627{
2628 struct inet6_dev *idev;
25fb6ca4
BK		 2629 struct net_device *sp_dev;
2630 struct inet6_ifaddr *sp_ifa;
2631 struct rt6_info *sp_rt;
1da177e4
LT		 2632
2633 /* ::1 */
2634
2635 ASSERT_RTNL();
2636
2637 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2638 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2639 return;
2640 }
2641
b5f348e5 2642 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2643
2644 /* Add routes to other interface's IPv6 addresses */
2645 for_each_netdev(dev_net(dev), sp_dev) {
2646 if (!strcmp(sp_dev->name, dev->name))
2647 continue;
2648
2649 idev = __in6_dev_get(sp_dev);
2650 if (!idev)
2651 continue;
2652
2653 read_lock_bh(&idev->lock);
2654 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2655
2656 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2657 continue;
2658
2659 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
2660
2661 /* Failure cases are ignored */
534c8779
G		 2662 if (!IS_ERR(sp_rt)) {
2663 sp_ifa->rt = sp_rt;
25fb6ca4 2664 ip6_ins_rt(sp_rt);
534c8779 2665 }
25fb6ca4
BK		 2666 }
2667 read_unlock_bh(&idev->lock);
2668 }
1da177e4
LT		 2669}
2670
b71d1d42 2671static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4 2672{
8e5e8f30 2673 struct inet6_ifaddr *ifp;
95c385b4
NH		 2674 u32 addr_flags = IFA_F_PERMANENT;
2675
2676#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2677 if (idev->cnf.optimistic_dad &&
702beb87 2678 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2679 addr_flags |= IFA_F_OPTIMISTIC;
2680#endif
1da177e4 2681
95c385b4
NH		 2682
2683 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2684 if (!IS_ERR(ifp)) {
46d48046 2685 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2686 addrconf_dad_start(ifp);
1da177e4
LT		 2687 in6_ifa_put(ifp);
2688 }
2689}
2690
2691static void addrconf_dev_config(struct net_device *dev)
2692{
2693 struct in6_addr addr;
8e5e8f30 2694 struct inet6_dev *idev;
1da177e4
LT		 2695
2696 ASSERT_RTNL();
2697
74235a25
HX		 2698 if ((dev->type != ARPHRD_ETHER) &&
2699 (dev->type != ARPHRD_FDDI) &&
74235a25 2700 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 2701 (dev->type != ARPHRD_INFINIBAND) &&
cb6bf355
YH		 2702 (dev->type != ARPHRD_IEEE802154) &&
2703 (dev->type != ARPHRD_IEEE1394)) {
74235a25
HX		 2704 /* Alas, we support only Ethernet autoconfiguration. */
2705 return;
2706 }
2707
1da177e4 2708 idev = addrconf_add_dev(dev);
64e724f6 2709 if (IS_ERR(idev))
1da177e4
LT		 2710 return;
2711
2712 memset(&addr, 0, sizeof(struct in6_addr));
2713 addr.s6_addr32[0] = htonl(0xFE800000);
2714
2715 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2716 addrconf_add_linklocal(idev, &addr);
2717}
2718
07a93626 2719#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2720static void addrconf_sit_config(struct net_device *dev)
2721{
2722 struct inet6_dev *idev;
2723
2724 ASSERT_RTNL();
2725
1ab1457c
YH		 2726 /*
2727 * Configure the tunnel with one of our IPv4
2728 * addresses... we should configure all of
1da177e4
LT		 2729 * our v4 addrs in the tunnel
2730 */
2731
2732 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2733 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2734 return;
2735 }
2736
c7dc89c0
FT		 2737 if (dev->priv_flags & IFF_ISATAP) {
2738 struct in6_addr addr;
2739
2740 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2741 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2742 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2743 addrconf_add_linklocal(idev, &addr);
2744 return;
2745 }
2746
1da177e4
LT		 2747 sit_add_v4_addrs(idev);
2748
62b54dd9 2749 if (dev->flags&IFF_POINTOPOINT)
1da177e4 2750 addrconf_add_mroute(dev);
62b54dd9 2751 else
1da177e4
LT		 2752 sit_route_add(dev);
2753}
0be669bb 2754#endif
1da177e4 2755
07a93626 2756#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2757static void addrconf_gre_config(struct net_device *dev)
2758{
2759 struct inet6_dev *idev;
2760 struct in6_addr addr;
2761
aee80b54 2762 ASSERT_RTNL();
2763
2764 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2765 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 2766 return;
2767 }
2768
2769 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2770 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2771
2772 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2773 addrconf_add_linklocal(idev, &addr);
2774}
2775#endif
2776
1da177e4
LT		 2777static inline int
2778ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2779{
2780 struct in6_addr lladdr;
2781
95c385b4 2782 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2783 addrconf_add_linklocal(idev, &lladdr);
2784 return 0;
2785 }
2786 return -1;
2787}
2788
2789static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2790{
2791 struct net_device *link_dev;
c346dca1 2792 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2793
2794 /* first try to inherit the link-local address from the link device */
2795 if (idev->dev->iflink &&
6fda7350 2796 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2797 if (!ipv6_inherit_linklocal(idev, link_dev))
2798 return;
2799 }
2800 /* then try to inherit it from any device */
6fda7350 2801 for_each_netdev(net, link_dev) {
1da177e4
LT		 2802 if (!ipv6_inherit_linklocal(idev, link_dev))
2803 return;
2804 }
91df42be 2805 pr_debug("init ip6-ip6: add_linklocal failed\n");
1da177e4
LT		 2806}
2807
2808/*
2809 * Autoconfigure tunnel with a link-local address so routing protocols,
2810 * DHCPv6, MLD etc. can be run over the virtual link
2811 */
2812
2813static void addrconf_ip6_tnl_config(struct net_device *dev)
2814{
2815 struct inet6_dev *idev;
2816
2817 ASSERT_RTNL();
2818
e21e8467 2819 idev = addrconf_add_dev(dev);
64e724f6 2820 if (IS_ERR(idev)) {
91df42be 2821 pr_debug("init ip6-ip6: add_dev failed\n");
1da177e4
LT		 2822 return;
2823 }
2824 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2825}
2826
1ab1457c 2827static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 2828 void *ptr)
1da177e4 2829{
351638e7 2830 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 2831 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2832 int run_pending = 0;
b217d616 2833 int err;
1da177e4 2834
e21e8467 2835 switch (event) {
45ba9dd2 2836 case NETDEV_REGISTER:
74235a25 2837 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2838 idev = ipv6_add_dev(dev);
2839 if (!idev)
b217d616 2840 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2841 }
2842 break;
bcdd553f 2843
1da177e4 2844 case NETDEV_UP:
3c21edbd 2845 case NETDEV_CHANGE:
c2edacf8
JV		 2846 if (dev->flags & IFF_SLAVE)
2847 break;
2848
3c21edbd 2849 if (event == NETDEV_UP) {
f24e3d65 2850 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 2851 /* device is not ready yet. */
f3213831 2852 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 2853 dev->name);
2854 break;
2855 }
99081049 2856
d31c7b8f
EP		 2857 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2858 idev = ipv6_add_dev(dev);
2859
e3ec6cfc 2860 if (idev) {
99081049 2861 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2862 run_pending = 1;
2863 }
3c21edbd 2864 } else {
f24e3d65 2865 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2866 /* device is still not ready. */
2867 break;
2868 }
2869
2870 if (idev) {
bcdd553f 2871 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2872 /* device is already configured. */
2873 break;
3c21edbd
YH		 2874 idev->if_flags |= IF_READY;
2875 }
2876
f3213831
JP		 2877 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2878 dev->name);
3c21edbd 2879
c5e33bdd 2880 run_pending = 1;
3c21edbd
YH		 2881 }
2882
e21e8467 2883 switch (dev->type) {
07a93626 2884#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2885 case ARPHRD_SIT:
2886 addrconf_sit_config(dev);
2887 break;
aee80b54 2888#endif
07a93626 2889#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2890 case ARPHRD_IPGRE:
2891 addrconf_gre_config(dev);
2892 break;
0be669bb 2893#endif
1da177e4
LT		 2894 case ARPHRD_TUNNEL6:
2895 addrconf_ip6_tnl_config(dev);
2896 break;
2897 case ARPHRD_LOOPBACK:
2898 init_loopback(dev);
2899 break;
2900
2901 default:
2902 addrconf_dev_config(dev);
2903 break;
3ff50b79 2904 }
bcdd553f 2905
1da177e4 2906 if (idev) {
c5e33bdd
YH		 2907 if (run_pending)
2908 addrconf_dad_run(idev);
2909
bcdd553f
SH		 2910 /*
2911 * If the MTU changed during the interface down,
2912 * when the interface up, the changed MTU must be
2913 * reflected in the idev as well as routers.
1da177e4 2914 */
bcdd553f
SH		 2915 if (idev->cnf.mtu6 != dev->mtu &&
2916 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2917 rt6_mtu_change(dev, dev->mtu);
2918 idev->cnf.mtu6 = dev->mtu;
2919 }
2920 idev->tstamp = jiffies;
2921 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2922
2923 /*
2924 * If the changed mtu during down is lower than
2925 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2926 */
2927 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2928 addrconf_ifdown(dev, 1);
1da177e4
LT		 2929 }
2930 break;
2931
2932 case NETDEV_CHANGEMTU:
d31c7b8f 2933 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2934 rt6_mtu_change(dev, dev->mtu);
2935 idev->cnf.mtu6 = dev->mtu;
2936 break;
2937 }
2938
d31c7b8f
EP		 2939 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2940 idev = ipv6_add_dev(dev);
2941 if (idev)
2942 break;
2943 }
2944
bcdd553f
SH		 2945 /*
2946 * MTU falled under IPV6_MIN_MTU.
2947 * Stop IPv6 on this interface.
2948 */
1da177e4
LT		 2949
2950 case NETDEV_DOWN:
2951 case NETDEV_UNREGISTER:
2952 /*
2953 * Remove all addresses from this interface.
2954 */
2955 addrconf_ifdown(dev, event != NETDEV_DOWN);
2956 break;
3c21edbd 2957
1da177e4 2958 case NETDEV_CHANGENAME:
1da177e4 2959 if (idev) {
5632c515 2960 snmp6_unregister_dev(idev);
408c4768 2961 addrconf_sysctl_unregister(idev);
f52295a9 2962 addrconf_sysctl_register(idev);
b217d616
HX		 2963 err = snmp6_register_dev(idev);
2964 if (err)
2965 return notifier_from_errno(err);
5632c515 2966 }
1da177e4 2967 break;
bcdd553f 2968
93d9b7d7
JP		 2969 case NETDEV_PRE_TYPE_CHANGE:
2970 case NETDEV_POST_TYPE_CHANGE:
2971 addrconf_type_change(dev, event);
75c78500 2972 break;
3ff50b79 2973 }
1da177e4
LT		 2974
2975 return NOTIFY_OK;
2976}
2977
2978/*
2979 * addrconf module should be notified of a device going up
2980 */
2981static struct notifier_block ipv6_dev_notf = {
2982 .notifier_call = addrconf_notify,
1da177e4
LT		 2983};
2984
93d9b7d7 2985static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2986{
2987 struct inet6_dev *idev;
2988 ASSERT_RTNL();
2989
2990 idev = __in6_dev_get(dev);
2991
93d9b7d7 2992 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2993 ipv6_mc_remap(idev);
93d9b7d7 2994 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2995 ipv6_mc_unmap(idev);
2996}
2997
1da177e4
LT		 2998static int addrconf_ifdown(struct net_device *dev, int how)
2999{
c346dca1 3000 struct net *net = dev_net(dev);
502a2ffd 3001 struct inet6_dev *idev;
3002 struct inet6_ifaddr *ifa;
73a8bd74 3003 int state, i;
1da177e4
LT		 3004
3005 ASSERT_RTNL();
3006
73a8bd74
DM		 3007 rt6_ifdown(net, dev);
3008 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3009
3010 idev = __in6_dev_get(dev);
3011 if (idev == NULL)
3012 return -ENODEV;
3013
bcdd553f
SH		 3014 /*
3015 * Step 1: remove reference to ipv6 device from parent device.
3016 * Do not dev_put!
1da177e4 3017 */
439e2385 3018 if (how) {
1da177e4 3019 idev->dead = 1;
8814c4b5
YH		 3020
3021 /* protected by rtnl_lock */
a9b3cd7f 3022 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3023
3024 /* Step 1.5: remove snmp6 entry */
3025 snmp6_unregister_dev(idev);
3026
3027 }
3028
73a8bd74
DM		 3029 /* Step 2: clear hash table */
3030 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3031 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3032
3033 spin_lock_bh(&addrconf_hash_lock);
3034 restart:
b67bfe0d 3035 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74
DM		 3036 if (ifa->idev == idev) {
3037 hlist_del_init_rcu(&ifa->addr_lst);
b7b1bfce 3038 addrconf_del_dad_timer(ifa);
73a8bd74
DM		 3039 goto restart;
3040 }
3041 }
3042 spin_unlock_bh(&addrconf_hash_lock);
3043 }
3044
1da177e4
LT		 3045 write_lock_bh(&idev->lock);
3046
b7b1bfce
HFS		 3047 addrconf_del_rs_timer(idev);
3048
bcdd553f 3049 /* Step 2: clear flags for stateless addrconf */
439e2385 3050 if (!how)
3c21edbd 3051 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3052
1da177e4 3053#ifdef CONFIG_IPV6_PRIVACY
439e2385 3054 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 3055 in6_dev_put(idev);
3056
bcdd553f 3057 /* Step 3: clear tempaddr list */
372e6c8f 3058 while (!list_empty(&idev->tempaddr_list)) {
3059 ifa = list_first_entry(&idev->tempaddr_list,
3060 struct inet6_ifaddr, tmp_list);
3061 list_del(&ifa->tmp_list);
1da177e4
LT		 3062 write_unlock_bh(&idev->lock);
3063 spin_lock_bh(&ifa->lock);
3064
3065 if (ifa->ifpub) {
3066 in6_ifa_put(ifa->ifpub);
3067 ifa->ifpub = NULL;
3068 }
3069 spin_unlock_bh(&ifa->lock);
3070 in6_ifa_put(ifa);
3071 write_lock_bh(&idev->lock);
3072 }
3073#endif
8f37ada5 3074
502a2ffd 3075 while (!list_empty(&idev->addr_list)) {
3076 ifa = list_first_entry(&idev->addr_list,
3077 struct inet6_ifaddr, if_list);
b7b1bfce 3078 addrconf_del_dad_timer(ifa);
84e8b803 3079
73a8bd74 3080 list_del(&ifa->if_list);
84e8b803 3081
73a8bd74 3082 write_unlock_bh(&idev->lock);
84e8b803 3083
73a8bd74
DM		 3084 spin_lock_bh(&ifa->state_lock);
3085 state = ifa->state;
3086 ifa->state = INET6_IFADDR_STATE_DEAD;
3087 spin_unlock_bh(&ifa->state_lock);
9d82ca98 3088
73a8bd74
DM		 3089 if (state != INET6_IFADDR_STATE_DEAD) {
3090 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3091 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 3092 }
73a8bd74 3093 in6_ifa_put(ifa);
8f37ada5 3094
73a8bd74
DM		 3095 write_lock_bh(&idev->lock);
3096 }
8f37ada5 3097
1da177e4
LT		 3098 write_unlock_bh(&idev->lock);
3099
3100 /* Step 5: Discard multicast list */
439e2385 3101 if (how)
1da177e4
LT		 3102 ipv6_mc_destroy_dev(idev);
3103 else
3104 ipv6_mc_down(idev);
3105
1da177e4 3106 idev->tstamp = jiffies;
1ab1457c 3107
bcdd553f 3108 /* Last: Shot the device (if unregistered) */
439e2385 3109 if (how) {
408c4768 3110 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3111 neigh_parms_release(&nd_tbl, idev->nd_parms);
3112 neigh_ifdown(&nd_tbl, dev);
3113 in6_dev_put(idev);
3114 }
3115 return 0;
3116}
3117
3118static void addrconf_rs_timer(unsigned long data)
3119{
b7b1bfce
HFS		 3120 struct inet6_dev *idev = (struct inet6_dev *)data;
3121 struct in6_addr lladdr;
1da177e4 3122
b7b1bfce 3123 write_lock(&idev->lock);
5b2a1953 3124 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3125 goto out;
3126
9ba2add3 3127 if (!ipv6_accept_ra(idev))
5b2a1953 3128 goto out;
3129
3130 /* Announcement received after solicitation was sent */
3131 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3132 goto out;
1da177e4 3133
b7b1bfce
HFS		 3134 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3135 if (!__ipv6_get_lladdr(idev, &lladdr, IFA_F_TENTATIVE))
3136 ndisc_send_rs(idev->dev, &lladdr,
3137 &in6addr_linklocal_allrouters);
3138 else
3139 goto out;
1da177e4 3140
b7b1bfce
HFS		 3141 /* The wait after the last probe can be shorter */
3142 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3143 idev->cnf.rtr_solicits) ?
3144 idev->cnf.rtr_solicit_delay :
3145 idev->cnf.rtr_solicit_interval);
1da177e4 3146 } else {
1da177e4
LT		 3147 /*
3148 * Note: we do not support deprecated "all on-link"
3149 * assumption any longer.
3150 */
91df42be 3151 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3152 }
3153
3154out:
b7b1bfce
HFS		 3155 write_unlock(&idev->lock);
3156 in6_dev_put(idev);
1da177e4
LT		 3157}
3158
3159/*
3160 * Duplicate Address Detection
3161 */
3c21edbd
YH		 3162static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3163{
3164 unsigned long rand_num;
3165 struct inet6_dev *idev = ifp->idev;
3166
95c385b4
NH		 3167 if (ifp->flags & IFA_F_OPTIMISTIC)
3168 rand_num = 0;
3169 else
3170 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3171
b7b1bfce
HFS		 3172 ifp->dad_probes = idev->cnf.dad_transmits;
3173 addrconf_mod_dad_timer(ifp, rand_num);
3c21edbd
YH		 3174}
3175
cf22f9a2 3176static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4
LT		 3177{
3178 struct inet6_dev *idev = ifp->idev;
3179 struct net_device *dev = idev->dev;
1da177e4
LT		 3180
3181 addrconf_join_solict(dev, &ifp->addr);
3182
1da177e4 3183 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 3184
3185 read_lock_bh(&idev->lock);
622ccdf1 3186 spin_lock(&ifp->lock);
e9d3e084 3187 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3188 goto out;
1da177e4
LT		 3189
3190 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3191 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3192 !(ifp->flags&IFA_F_TENTATIVE) ||
3193 ifp->flags & IFA_F_NODAD) {
cc411d0b 3194 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3195 spin_unlock(&ifp->lock);
1da177e4
LT		 3196 read_unlock_bh(&idev->lock);
3197
3198 addrconf_dad_completed(ifp);
3199 return;
3200 }
3201
6732bade 3202 if (!(idev->if_flags & IF_READY)) {
21809faf 3203 spin_unlock(&ifp->lock);
6732bade 3204 read_unlock_bh(&idev->lock);
3c21edbd 3205 /*
590a9887 3206 * If the device is not ready:
3c21edbd
YH		 3207 * - keep it tentative if it is a permanent address.
3208 * - otherwise, kill it.
3209 */
3210 in6_ifa_hold(ifp);
cc411d0b 3211 addrconf_dad_stop(ifp, 0);
6732bade 3212 return;
3c21edbd 3213 }
95c385b4
NH		 3214
3215 /*
3216 * Optimistic nodes can start receiving
3217 * Frames right away
3218 */
e21e8467 3219 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 3220 ip6_ins_rt(ifp->rt);
3221
6732bade 3222 addrconf_dad_kick(ifp);
1da177e4 3223out:
622ccdf1 3224 spin_unlock(&ifp->lock);
1da177e4
LT		 3225 read_unlock_bh(&idev->lock);
3226}
3227
3228static void addrconf_dad_timer(unsigned long data)
3229{
3230 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3231 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3232 struct in6_addr mcaddr;
3233
b7b1bfce 3234 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3235 goto out;
3236
b7b1bfce 3237 write_lock(&idev->lock);
122e4519 3238 if (idev->dead || !(idev->if_flags & IF_READY)) {
b7b1bfce 3239 write_unlock(&idev->lock);
1da177e4
LT		 3240 goto out;
3241 }
21809faf 3242
3243 spin_lock(&ifp->lock);
622ccdf1
HX		 3244 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3245 spin_unlock(&ifp->lock);
b7b1bfce 3246 write_unlock(&idev->lock);
622ccdf1
HX		 3247 goto out;
3248 }
3249
b7b1bfce 3250 if (ifp->dad_probes == 0) {
1da177e4
LT		 3251 /*
3252 * DAD was successful
3253 */
3254
cc411d0b 3255 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3256 spin_unlock(&ifp->lock);
b7b1bfce 3257 write_unlock(&idev->lock);
1da177e4
LT		 3258
3259 addrconf_dad_completed(ifp);
3260
3261 goto out;
3262 }
3263
b7b1bfce
HFS		 3264 ifp->dad_probes--;
3265 addrconf_mod_dad_timer(ifp, ifp->idev->nd_parms->retrans_time);
21809faf 3266 spin_unlock(&ifp->lock);
b7b1bfce 3267 write_unlock(&idev->lock);
1da177e4
LT		 3268
3269 /* send a neighbour solicitation for our addr */
1da177e4 3270 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3271 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3272out:
3273 in6_ifa_put(ifp);
3274}
3275
3276static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3277{
e21e8467 3278 struct net_device *dev = ifp->idev->dev;
b7b1bfce
HFS		 3279 struct in6_addr lladdr;
3280
3281 addrconf_del_dad_timer(ifp);
1da177e4
LT		 3282
3283 /*
3284 * Configure the address for reception. Now it is valid.
3285 */
3286
3287 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3288
026359bc
TA		 3289 /* If added prefix is link local and we are prepared to process
3290 router advertisements, start sending router solicitations.
1da177e4
LT		 3291 */
3292
aeaf6e9d 3293 if (ipv6_accept_ra(ifp->idev) &&
1da177e4
LT		 3294 ifp->idev->cnf.rtr_solicits > 0 &&
3295 (dev->flags&IFF_LOOPBACK) == 0 &&
3296 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 3297 /*
3298 * If a host as already performed a random delay
3299 * [...] as part of DAD [...] there is no need
3300 * to delay again before sending the first RS
3301 */
b7b1bfce
HFS		 3302 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3303 ndisc_send_rs(dev, &lladdr,
3304 &in6addr_linklocal_allrouters);
3305 else
3306 return;
1da177e4 3307
b7b1bfce
HFS		 3308 write_lock_bh(&ifp->idev->lock);
3309 spin_lock(&ifp->lock);
3310 ifp->idev->rs_probes = 1;
1da177e4 3311 ifp->idev->if_flags |= IF_RS_SENT;
b7b1bfce
HFS		 3312 addrconf_mod_rs_timer(ifp->idev,
3313 ifp->idev->cnf.rtr_solicit_interval);
3314 spin_unlock(&ifp->lock);
3315 write_unlock_bh(&ifp->idev->lock);
1da177e4
LT		 3316 }
3317}
3318
e21e8467
SH		 3319static void addrconf_dad_run(struct inet6_dev *idev)
3320{
c5e33bdd
YH		 3321 struct inet6_ifaddr *ifp;
3322
3323 read_lock_bh(&idev->lock);
502a2ffd 3324 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3325 spin_lock(&ifp->lock);
f2344a13
HX		 3326 if (ifp->flags & IFA_F_TENTATIVE &&
3327 ifp->state == INET6_IFADDR_STATE_DAD)
3328 addrconf_dad_kick(ifp);
21809faf 3329 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3330 }
3331 read_unlock_bh(&idev->lock);
3332}
3333
1da177e4
LT		 3334#ifdef CONFIG_PROC_FS
3335struct if6_iter_state {
3c40090a 3336 struct seq_net_private p;
1da177e4 3337 int bucket;
1d578303 3338 int offset;
1da177e4
LT		 3339};
3340
1d578303 3341static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3342{
3343 struct inet6_ifaddr *ifa = NULL;
3344 struct if6_iter_state *state = seq->private;
1218854a 3345 struct net *net = seq_file_net(seq);
1d578303 3346 int p = 0;
1da177e4 3347
1d578303
MM		 3348 /* initial bucket if pos is 0 */
3349 if (pos == 0) {
3350 state->bucket = 0;
3351 state->offset = 0;
3352 }
3353
3354 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3355 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3356 addr_lst) {
9f0d3c27
ED		 3357 if (!net_eq(dev_net(ifa->idev->dev), net))
3358 continue;
1d578303
MM		 3359 /* sync with offset */
3360 if (p < state->offset) {
3361 p++;
3362 continue;
3363 }
3364 state->offset++;
9f0d3c27 3365 return ifa;
1d578303
MM		 3366 }
3367
3368 /* prepare for next bucket */
3369 state->offset = 0;
3370 p = 0;
1da177e4 3371 }
c2e21293 3372 return NULL;
1da177e4
LT		 3373}
3374
c2e21293 3375static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3376 struct inet6_ifaddr *ifa)
1da177e4
LT		 3377{
3378 struct if6_iter_state *state = seq->private;
1218854a 3379 struct net *net = seq_file_net(seq);
1da177e4 3380
b67bfe0d 3381 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3382 if (!net_eq(dev_net(ifa->idev->dev), net))
3383 continue;
1d578303 3384 state->offset++;
9f0d3c27 3385 return ifa;
1d578303 3386 }
3c40090a 3387
c2e21293 3388 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3389 state->offset = 0;
b67bfe0d 3390 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3391 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3392 if (!net_eq(dev_net(ifa->idev->dev), net))
3393 continue;
1d578303 3394 state->offset++;
9f0d3c27 3395 return ifa;
c2e21293 3396 }
1da177e4 3397 }
3c40090a 3398
c2e21293 3399 return NULL;
1da177e4
LT		 3400}
3401
1da177e4 3402static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3403 __acquires(rcu_bh)
1da177e4 3404{
5c578aed 3405 rcu_read_lock_bh();
1d578303 3406 return if6_get_first(seq, *pos);
1da177e4
LT		 3407}
3408
3409static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3410{
3411 struct inet6_ifaddr *ifa;
3412
3413 ifa = if6_get_next(seq, v);
3414 ++*pos;
3415 return ifa;
3416}
3417
3418static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3419 __releases(rcu_bh)
1da177e4 3420{
5c578aed 3421 rcu_read_unlock_bh();
1da177e4
LT		 3422}
3423
3424static int if6_seq_show(struct seq_file *seq, void *v)
3425{
3426 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3427 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3428 &ifp->addr,
1da177e4
LT		 3429 ifp->idev->dev->ifindex,
3430 ifp->prefix_len,
3431 ifp->scope,
3432 ifp->flags,
3433 ifp->idev->dev->name);
3434 return 0;
3435}
3436
56b3d975 3437static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3438 .start = if6_seq_start,
3439 .next = if6_seq_next,
3440 .show = if6_seq_show,
3441 .stop = if6_seq_stop,
3442};
3443
3444static int if6_seq_open(struct inode *inode, struct file *file)
3445{
3c40090a
DL		 3446 return seq_open_net(inode, file, &if6_seq_ops,
3447 sizeof(struct if6_iter_state));
1da177e4
LT		 3448}
3449
9a32144e 3450static const struct file_operations if6_fops = {
1da177e4
LT		 3451 .owner = THIS_MODULE,
3452 .open = if6_seq_open,
3453 .read = seq_read,
3454 .llseek = seq_lseek,
3c40090a 3455 .release = seq_release_net,
1da177e4
LT		 3456};
3457
2c8c1e72 3458static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3459{
d4beaa66 3460 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 3461 return -ENOMEM;
3462 return 0;
3463}
3464
2c8c1e72 3465static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 3466{
ece31ffd 3467 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 3468}
3469
3470static struct pernet_operations if6_proc_net_ops = {
3471 .init = if6_proc_net_init,
3472 .exit = if6_proc_net_exit,
3473};
3474
3475int __init if6_proc_init(void)
3476{
3477 return register_pernet_subsys(&if6_proc_net_ops);
3478}
3479
1da177e4
LT		 3480void if6_proc_exit(void)
3481{
3c40090a 3482 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3483}
3484#endif /* CONFIG_PROC_FS */
3485
07a93626 3486#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3487/* Check if address is a home address configured on any interface. */
b71d1d42 3488int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3489{
3490 int ret = 0;
c2e21293 3491 struct inet6_ifaddr *ifp = NULL;
ddbe5032 3492 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3493
5c578aed 3494 rcu_read_lock_bh();
b67bfe0d 3495 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 3496 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3497 continue;
caad295f 3498 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3499 (ifp->flags & IFA_F_HOMEADDRESS)) {
3500 ret = 1;
3501 break;
3502 }
3503 }
5c578aed 3504 rcu_read_unlock_bh();
3b9f9a1c
NT		 3505 return ret;
3506}
3507#endif
3508
1da177e4
LT		 3509/*
3510 * Periodic address status verification
3511 */
3512
3513static void addrconf_verify(unsigned long foo)
3514{
b2db7564 3515 unsigned long now, next, next_sec, next_sched;
1da177e4 3516 struct inet6_ifaddr *ifp;
1da177e4
LT		 3517 int i;
3518
5c578aed 3519 rcu_read_lock_bh();
3520 spin_lock(&addrconf_verify_lock);
1da177e4 3521 now = jiffies;
b2db7564 3522 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4
LT		 3523
3524 del_timer(&addr_chk_timer);
3525
bcdd553f 3526 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3527restart:
b67bfe0d 3528 hlist_for_each_entry_rcu_bh(ifp,
5c578aed 3529 &inet6_addr_lst[i], addr_lst) {
1da177e4 3530 unsigned long age;
1da177e4
LT		 3531
3532 if (ifp->flags & IFA_F_PERMANENT)
3533 continue;
3534
3535 spin_lock(&ifp->lock);
b2db7564
YH		 3536 /* We try to batch several events at once. */
3537 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3538
8f27ebb9
YH		 3539 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3540 age >= ifp->valid_lft) {
1da177e4
LT		 3541 spin_unlock(&ifp->lock);
3542 in6_ifa_hold(ifp);
1da177e4
LT		 3543 ipv6_del_addr(ifp);
3544 goto restart;
8f27ebb9
YH		 3545 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3546 spin_unlock(&ifp->lock);
3547 continue;
1da177e4 3548 } else if (age >= ifp->prefered_lft) {
a1ed0526 3549 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3550 int deprecate = 0;
3551
3552 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3553 deprecate = 1;
3554 ifp->flags |= IFA_F_DEPRECATED;
3555 }
3556
3557 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3558 next = ifp->tstamp + ifp->valid_lft * HZ;
3559
3560 spin_unlock(&ifp->lock);
3561
3562 if (deprecate) {
3563 in6_ifa_hold(ifp);
1da177e4
LT		 3564
3565 ipv6_ifa_notify(0, ifp);
3566 in6_ifa_put(ifp);
3567 goto restart;
3568 }
3569#ifdef CONFIG_IPV6_PRIVACY
3570 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3571 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3572 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3573 ifp->idev->cnf.dad_transmits *
3574 ifp->idev->nd_parms->retrans_time / HZ;
3575
1da177e4
LT		 3576 if (age >= ifp->prefered_lft - regen_advance) {
3577 struct inet6_ifaddr *ifpub = ifp->ifpub;
3578 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3579 next = ifp->tstamp + ifp->prefered_lft * HZ;
3580 if (!ifp->regen_count && ifpub) {
3581 ifp->regen_count++;
3582 in6_ifa_hold(ifp);
3583 in6_ifa_hold(ifpub);
3584 spin_unlock(&ifp->lock);
5c578aed 3585
291d809b
HY		 3586 spin_lock(&ifpub->lock);
3587 ifpub->regen_count = 0;
3588 spin_unlock(&ifpub->lock);
1da177e4
LT		 3589 ipv6_create_tempaddr(ifpub, ifp);
3590 in6_ifa_put(ifpub);
3591 in6_ifa_put(ifp);
3592 goto restart;
3593 }
3594 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3595 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3596 spin_unlock(&ifp->lock);
3597#endif
3598 } else {
3599 /* ifp->prefered_lft <= ifp->valid_lft */
3600 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3601 next = ifp->tstamp + ifp->prefered_lft * HZ;
3602 spin_unlock(&ifp->lock);
3603 }
3604 }
1da177e4
LT		 3605 }
3606
b2db7564
YH		 3607 next_sec = round_jiffies_up(next);
3608 next_sched = next;
3609
3610 /* If rounded timeout is accurate enough, accept it. */
3611 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3612 next_sched = next_sec;
3613
3614 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3615 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3616 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3617
3618 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3619 now, next, next_sec, next_sched));
3620
3621 addr_chk_timer.expires = next_sched;
1da177e4 3622 add_timer(&addr_chk_timer);
5c578aed 3623 spin_unlock(&addrconf_verify_lock);
3624 rcu_read_unlock_bh();
1da177e4
LT		 3625}
3626
caeaba79
ND		 3627static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3628 struct in6_addr **peer_pfx)
461d8837
TG		 3629{
3630 struct in6_addr *pfx = NULL;
3631
caeaba79
ND		 3632 *peer_pfx = NULL;
3633
461d8837
TG		 3634 if (addr)
3635 pfx = nla_data(addr);
3636
3637 if (local) {
3638 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 3639 *peer_pfx = pfx;
3640 pfx = nla_data(local);
461d8837
TG		 3641 }
3642
3643 return pfx;
3644}
3645
ef7c79ed 3646static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3647 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3648 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3649 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3650};
3651
1da177e4 3652static int
661d2967 3653inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3654{
3b1e0a65 3655 struct net *net = sock_net(skb->sk);
b933f716
TG		 3656 struct ifaddrmsg *ifm;
3657 struct nlattr *tb[IFA_MAX+1];
caeaba79 3658 struct in6_addr *pfx, *peer_pfx;
b933f716 3659 int err;
1da177e4 3660
b933f716
TG		 3661 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3662 if (err < 0)
3663 return err;
3664
3665 ifm = nlmsg_data(nlh);
caeaba79 3666 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3667 if (pfx == NULL)
3668 return -EINVAL;
3669
af284937 3670 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3671}
3672
55ebaef1
NT		 3673static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3674 u32 prefered_lft, u32 valid_lft)
081bba5b 3675{
6f704992
YH		 3676 u32 flags;
3677 clock_t expires;
4bed72e4 3678 unsigned long timeout;
46d48046 3679
081bba5b
NT		 3680 if (!valid_lft || (prefered_lft > valid_lft))
3681 return -EINVAL;
3682
4bed72e4
YH		 3683 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3684 if (addrconf_finite_timeout(timeout)) {
3685 expires = jiffies_to_clock_t(timeout * HZ);
3686 valid_lft = timeout;
6f704992 3687 flags = RTF_EXPIRES;
4bed72e4
YH		 3688 } else {
3689 expires = 0;
3690 flags = 0;
3691 ifa_flags |= IFA_F_PERMANENT;
6f704992 3692 }
081bba5b 3693
4bed72e4
YH		 3694 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3695 if (addrconf_finite_timeout(timeout)) {
3696 if (timeout == 0)
3697 ifa_flags |= IFA_F_DEPRECATED;
3698 prefered_lft = timeout;
3699 }
081bba5b
NT		 3700
3701 spin_lock_bh(&ifp->lock);
3b9f9a1c 3702 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3703 ifp->tstamp = jiffies;
3704 ifp->valid_lft = valid_lft;
3705 ifp->prefered_lft = prefered_lft;
3706
3707 spin_unlock_bh(&ifp->lock);
3708 if (!(ifp->flags&IFA_F_TENTATIVE))
3709 ipv6_ifa_notify(0, ifp);
081bba5b 3710
46d48046 3711 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3712 expires, flags);
081bba5b
NT		 3713 addrconf_verify(0);
3714
3715 return 0;
3716}
3717
1da177e4 3718static int
661d2967 3719inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3720{
3b1e0a65 3721 struct net *net = sock_net(skb->sk);
461d8837
TG		 3722 struct ifaddrmsg *ifm;
3723 struct nlattr *tb[IFA_MAX+1];
caeaba79 3724 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 3725 struct inet6_ifaddr *ifa;
3726 struct net_device *dev;
55ebaef1
NT		 3727 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3728 u8 ifa_flags;
461d8837 3729 int err;
1da177e4 3730
461d8837
TG		 3731 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3732 if (err < 0)
3733 return err;
3734
3735 ifm = nlmsg_data(nlh);
caeaba79 3736 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3737 if (pfx == NULL)
3738 return -EINVAL;
3739
461d8837 3740 if (tb[IFA_CACHEINFO]) {
0778769d 3741 struct ifa_cacheinfo *ci;
461d8837
TG		 3742
3743 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3744 valid_lft = ci->ifa_valid;
461d8837
TG		 3745 preferred_lft = ci->ifa_prefered;
3746 } else {
3747 preferred_lft = INFINITY_LIFE_TIME;
3748 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3749 }
3750
af284937 3751 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3752 if (dev == NULL)
3753 return -ENODEV;
3754
55ebaef1 3755 /* We ignore other flags so far. */
3b9f9a1c 3756 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3757
1cab3da6 3758 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3759 if (ifa == NULL) {
3760 /*
3761 * It would be best to check for !NLM_F_CREATE here but
3762 * userspace alreay relies on not having to provide this.
3763 */
caeaba79 3764 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 3765 ifm->ifa_prefixlen, ifa_flags,
3766 preferred_lft, valid_lft);
081bba5b
NT		 3767 }
3768
7198f8ce
TG		 3769 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3770 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3771 err = -EEXIST;
3772 else
55ebaef1 3773 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3774
3775 in6_ifa_put(ifa);
3776
3777 return err;
1da177e4
LT		 3778}
3779
101bb229
TG		 3780static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3781 u8 scope, int ifindex)
3782{
3783 struct ifaddrmsg *ifm;
3784
3785 ifm = nlmsg_data(nlh);
3786 ifm->ifa_family = AF_INET6;
3787 ifm->ifa_prefixlen = prefixlen;
3788 ifm->ifa_flags = flags;
3789 ifm->ifa_scope = scope;
3790 ifm->ifa_index = ifindex;
3791}
3792
85486af0
TG		 3793static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3794 unsigned long tstamp, u32 preferred, u32 valid)
3795{
3796 struct ifa_cacheinfo ci;
3797
18a31e1e
TG		 3798 ci.cstamp = cstamp_delta(cstamp);
3799 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 3800 ci.ifa_prefered = preferred;
3801 ci.ifa_valid = valid;
3802
3803 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3804}
3805
101bb229
TG		 3806static inline int rt_scope(int ifa_scope)
3807{
3808 if (ifa_scope & IFA_HOST)
3809 return RT_SCOPE_HOST;
3810 else if (ifa_scope & IFA_LINK)
3811 return RT_SCOPE_LINK;
3812 else if (ifa_scope & IFA_SITE)
3813 return RT_SCOPE_SITE;
3814 else
3815 return RT_SCOPE_UNIVERSE;
3816}
3817
0ab6803b
TG		 3818static inline int inet6_ifaddr_msgsize(void)
3819{
339bf98f 3820 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 3821 + nla_total_size(16) /* IFA_LOCAL */
339bf98f
TG		 3822 + nla_total_size(16) /* IFA_ADDRESS */
3823 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3824}
c5396a31 3825
1da177e4 3826static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 3827 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3828{
1da177e4 3829 struct nlmsghdr *nlh;
85486af0 3830 u32 preferred, valid;
1da177e4 3831
15e47304 3832 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3833 if (nlh == NULL)
26932566 3834 return -EMSGSIZE;
0ab6803b 3835
101bb229
TG		 3836 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3837 ifa->idev->dev->ifindex);
3838
1da177e4 3839 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3840 preferred = ifa->prefered_lft;
3841 valid = ifa->valid_lft;
3842 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3843 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3844 if (preferred > tval)
3845 preferred -= tval;
3846 else
3847 preferred = 0;
f56619fc
BH		 3848 if (valid != INFINITY_LIFE_TIME) {
3849 if (valid > tval)
3850 valid -= tval;
3851 else
3852 valid = 0;
3853 }
1da177e4
LT		 3854 }
3855 } else {
85486af0
TG		 3856 preferred = INFINITY_LIFE_TIME;
3857 valid = INFINITY_LIFE_TIME;
3858 }
3859
7996c799 3860 if (!ipv6_addr_any(&ifa->peer_addr)) {
caeaba79
ND		 3861 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3862 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3863 goto error;
3864 } else
3865 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3866 goto error;
3867
3868 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3869 goto error;
1da177e4 3870
0ab6803b 3871 return nlmsg_end(skb, nlh);
caeaba79
ND		 3872
3873error:
3874 nlmsg_cancel(skb, nlh);
3875 return -EMSGSIZE;
1da177e4
LT		 3876}
3877
3878static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 3879 u32 portid, u32 seq, int event, u16 flags)
1da177e4 3880{
1da177e4 3881 struct nlmsghdr *nlh;
101bb229
TG		 3882 u8 scope = RT_SCOPE_UNIVERSE;
3883 int ifindex = ifmca->idev->dev->ifindex;
3884
3885 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3886 scope = RT_SCOPE_SITE;
1da177e4 3887
15e47304 3888 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3889 if (nlh == NULL)
26932566 3890 return -EMSGSIZE;
85486af0 3891
0ab6803b
TG		 3892 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3893 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3894 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3895 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3896 nlmsg_cancel(skb, nlh);
3897 return -EMSGSIZE;
3898 }
85486af0 3899
0ab6803b 3900 return nlmsg_end(skb, nlh);
1da177e4
LT		 3901}
3902
3903static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 3904 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3905{
1da177e4 3906 struct nlmsghdr *nlh;
101bb229
TG		 3907 u8 scope = RT_SCOPE_UNIVERSE;
3908 int ifindex = ifaca->aca_idev->dev->ifindex;
3909
3910 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3911 scope = RT_SCOPE_SITE;
1da177e4 3912
15e47304 3913 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3914 if (nlh == NULL)
26932566 3915 return -EMSGSIZE;
85486af0 3916
0ab6803b
TG		 3917 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3918 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3919 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3920 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3921 nlmsg_cancel(skb, nlh);
3922 return -EMSGSIZE;
3923 }
1da177e4 3924
0ab6803b 3925 return nlmsg_end(skb, nlh);
1da177e4
LT		 3926}
3927
e21e8467 3928enum addr_type_t {
1da177e4
LT		 3929 UNICAST_ADDR,
3930 MULTICAST_ADDR,
3931 ANYCAST_ADDR,
3932};
3933
234b27c3
ED		 3934/* called with rcu_read_lock() */
3935static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3936 struct netlink_callback *cb, enum addr_type_t type,
3937 int s_ip_idx, int *p_ip_idx)
3938{
234b27c3
ED		 3939 struct ifmcaddr6 *ifmca;
3940 struct ifacaddr6 *ifaca;
3941 int err = 1;
3942 int ip_idx = *p_ip_idx;
3943
3944 read_lock_bh(&idev->lock);
3945 switch (type) {
502a2ffd 3946 case UNICAST_ADDR: {
3947 struct inet6_ifaddr *ifa;
3948
234b27c3 3949 /* unicast address incl. temp addr */
502a2ffd 3950 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3951 if (++ip_idx < s_ip_idx)
234b27c3
ED		 3952 continue;
3953 err = inet6_fill_ifaddr(skb, ifa,
15e47304 3954 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3955 cb->nlh->nlmsg_seq,
3956 RTM_NEWADDR,
3957 NLM_F_MULTI);
3958 if (err <= 0)
3959 break;
63998ac2 3960 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 3961 }
3962 break;
502a2ffd 3963 }
234b27c3
ED		 3964 case MULTICAST_ADDR:
3965 /* multicast address */
3966 for (ifmca = idev->mc_list; ifmca;
3967 ifmca = ifmca->next, ip_idx++) {
3968 if (ip_idx < s_ip_idx)
3969 continue;
3970 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 3971 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3972 cb->nlh->nlmsg_seq,
3973 RTM_GETMULTICAST,
3974 NLM_F_MULTI);
3975 if (err <= 0)
3976 break;
3977 }
3978 break;
3979 case ANYCAST_ADDR:
3980 /* anycast address */
3981 for (ifaca = idev->ac_list; ifaca;
3982 ifaca = ifaca->aca_next, ip_idx++) {
3983 if (ip_idx < s_ip_idx)
3984 continue;
3985 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 3986 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3987 cb->nlh->nlmsg_seq,
3988 RTM_GETANYCAST,
3989 NLM_F_MULTI);
3990 if (err <= 0)
3991 break;
3992 }
3993 break;
3994 default:
3995 break;
3996 }
3997 read_unlock_bh(&idev->lock);
3998 *p_ip_idx = ip_idx;
3999 return err;
4000}
4001
1da177e4
LT		 4002static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4003 enum addr_type_t type)
4004{
234b27c3
ED		 4005 struct net *net = sock_net(skb->sk);
4006 int h, s_h;
1da177e4
LT		 4007 int idx, ip_idx;
4008 int s_idx, s_ip_idx;
1da177e4 4009 struct net_device *dev;
234b27c3
ED		 4010 struct inet6_dev *idev;
4011 struct hlist_head *head;
1ab1457c 4012
234b27c3
ED		 4013 s_h = cb->args[0];
4014 s_idx = idx = cb->args[1];
4015 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4016
234b27c3 4017 rcu_read_lock();
63998ac2 4018 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4019 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4020 idx = 0;
4021 head = &net->dev_index_head[h];
b67bfe0d 4022 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4023 if (idx < s_idx)
4024 goto cont;
4b97efdf 4025 if (h > s_h || idx > s_idx)
234b27c3
ED		 4026 s_ip_idx = 0;
4027 ip_idx = 0;
e21e8467
SH		 4028 idev = __in6_dev_get(dev);
4029 if (!idev)
234b27c3
ED		 4030 goto cont;
4031
4032 if (in6_dump_addrs(idev, skb, cb, type,
4033 s_ip_idx, &ip_idx) <= 0)
4034 goto done;
7562f876 4035cont:
234b27c3
ED		 4036 idx++;
4037 }
1da177e4 4038 }
234b27c3
ED		 4039done:
4040 rcu_read_unlock();
4041 cb->args[0] = h;
4042 cb->args[1] = idx;
4043 cb->args[2] = ip_idx;
4044
1da177e4
LT		 4045 return skb->len;
4046}
4047
4048static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4049{
4050 enum addr_type_t type = UNICAST_ADDR;
b854272b 4051
1da177e4
LT		 4052 return inet6_dump_addr(skb, cb, type);
4053}
4054
4055static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4056{
4057 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4058
1da177e4
LT		 4059 return inet6_dump_addr(skb, cb, type);
4060}
4061
4062
4063static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4064{
4065 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4066
1da177e4
LT		 4067 return inet6_dump_addr(skb, cb, type);
4068}
4069
661d2967 4070static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4071{
3b1e0a65 4072 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4073 struct ifaddrmsg *ifm;
4074 struct nlattr *tb[IFA_MAX+1];
caeaba79 4075 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4076 struct net_device *dev = NULL;
4077 struct inet6_ifaddr *ifa;
4078 struct sk_buff *skb;
6c223828
NT		 4079 int err;
4080
1b29fc2c
TG		 4081 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4082 if (err < 0)
4083 goto errout;
4084
caeaba79 4085 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
1b29fc2c
TG		 4086 if (addr == NULL) {
4087 err = -EINVAL;
4088 goto errout;
6c223828 4089 }
6c223828 4090
1b29fc2c 4091 ifm = nlmsg_data(nlh);
6c223828 4092 if (ifm->ifa_index)
6fda7350 4093 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4094
e21e8467
SH		 4095 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4096 if (!ifa) {
1b29fc2c
TG		 4097 err = -EADDRNOTAVAIL;
4098 goto errout;
4099 }
6c223828 4100
e21e8467
SH		 4101 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4102 if (!skb) {
6c223828 4103 err = -ENOBUFS;
1b29fc2c 4104 goto errout_ifa;
6c223828
NT		 4105 }
4106
15e47304 4107 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4108 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4109 if (err < 0) {
4110 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4111 WARN_ON(err == -EMSGSIZE);
4112 kfree_skb(skb);
4113 goto errout_ifa;
4114 }
15e47304 4115 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4116errout_ifa:
6c223828 4117 in6_ifa_put(ifa);
1b29fc2c 4118errout:
6c223828 4119 return err;
6c223828
NT		 4120}
4121
1da177e4
LT		 4122static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4123{
4124 struct sk_buff *skb;
c346dca1 4125 struct net *net = dev_net(ifa->idev->dev);
5d620266 4126 int err = -ENOBUFS;
1da177e4 4127
0ab6803b 4128 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 4129 if (skb == NULL)
4130 goto errout;
4131
4132 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4133 if (err < 0) {
4134 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4135 WARN_ON(err == -EMSGSIZE);
4136 kfree_skb(skb);
4137 goto errout;
4138 }
1ce85fe4
PNA		 4139 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4140 return;
5d620266
TG		 4141errout:
4142 if (err < 0)
6fda7350 4143 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4144}
4145
b6f99a21 4146static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4147 __s32 *array, int bytes)
4148{
04561c1f
TG		 4149 BUG_ON(bytes < (DEVCONF_MAX * 4));
4150
1da177e4
LT		 4151 memset(array, 0, bytes);
4152 array[DEVCONF_FORWARDING] = cnf->forwarding;
4153 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4154 array[DEVCONF_MTU6] = cnf->mtu6;
4155 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4156 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4157 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4158 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4159 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4160 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4161 jiffies_to_msecs(cnf->rtr_solicit_interval);
4162 array[DEVCONF_RTR_SOLICIT_DELAY] =
4163 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4
LT		 4164 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4165#ifdef CONFIG_IPV6_PRIVACY
4166 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4167 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4168 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4169 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4170 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4171#endif
4172 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4173 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 4174 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4175#ifdef CONFIG_IPV6_ROUTER_PREF
4176 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4177 array[DEVCONF_RTR_PROBE_INTERVAL] =
4178 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4179#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4180 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4181#endif
930d6ff2 4182#endif
fbea49e1 4183 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4184 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4185#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4186 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4187#endif
7bc570c8
YH		 4188#ifdef CONFIG_IPV6_MROUTE
4189 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4190#endif
778d80be 4191 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4192 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4193 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4194 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
1da177e4
LT		 4195}
4196
b382b191
TG		 4197static inline size_t inet6_ifla6_size(void)
4198{
4199 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4200 + nla_total_size(sizeof(struct ifla_cacheinfo))
4201 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4202 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4203 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4204 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4205}
4206
339bf98f
TG		 4207static inline size_t inet6_if_nlmsg_size(void)
4208{
4209 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4210 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4211 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4212 + nla_total_size(4) /* IFLA_MTU */
4213 + nla_total_size(4) /* IFLA_LINK */
b382b191 4214 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4215}
c5396a31 4216
be281e55 4217static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4218 int items, int bytes)
7f7d9a6b
HX		 4219{
4220 int i;
4221 int pad = bytes - sizeof(u64) * items;
4222 BUG_ON(pad < 0);
4223
4224 /* Use put_unaligned() because stats may not be aligned for u64. */
4225 put_unaligned(items, &stats[0]);
4226 for (i = 1; i < items; i++)
be281e55 4227 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4228
4229 memset(&stats[items], 0, pad);
4230}
4231
4ce3c183
ED		 4232static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4233 int items, int bytes, size_t syncpoff)
4234{
4235 int i;
4236 int pad = bytes - sizeof(u64) * items;
4237 BUG_ON(pad < 0);
4238
4239 /* Use put_unaligned() because stats may not be aligned for u64. */
4240 put_unaligned(items, &stats[0]);
4241 for (i = 1; i < items; i++)
4242 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4243
4244 memset(&stats[items], 0, pad);
4245}
4246
7f7d9a6b
HX		 4247static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4248 int bytes)
4249{
e21e8467 4250 switch (attrtype) {
7f7d9a6b 4251 case IFLA_INET6_STATS:
4ce3c183
ED		 4252 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4253 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4254 break;
4255 case IFLA_INET6_ICMP6STATS:
be281e55 4256 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4257 break;
4258 }
4259}
4260
b382b191
TG		 4261static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4262{
4263 struct nlattr *nla;
4264 struct ifla_cacheinfo ci;
4265
c78679e8
DM		 4266 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4267 goto nla_put_failure;
b382b191 4268 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4269 ci.tstamp = cstamp_delta(idev->tstamp);
4270 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4271 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
c78679e8
DM		 4272 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4273 goto nla_put_failure;
b382b191
TG		 4274 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4275 if (nla == NULL)
4276 goto nla_put_failure;
4277 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4278
4279 /* XXX - MC not implemented */
4280
4281 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4282 if (nla == NULL)
4283 goto nla_put_failure;
4284 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4285
4286 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4287 if (nla == NULL)
4288 goto nla_put_failure;
4289 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4290
f53adae4
DB		 4291 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4292 if (nla == NULL)
4293 goto nla_put_failure;
4294 read_lock_bh(&idev->lock);
4295 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4296 read_unlock_bh(&idev->lock);
4297
b382b191
TG		 4298 return 0;
4299
4300nla_put_failure:
4301 return -EMSGSIZE;
4302}
4303
4304static size_t inet6_get_link_af_size(const struct net_device *dev)
4305{
4306 if (!__in6_dev_get(dev))
4307 return 0;
4308
4309 return inet6_ifla6_size();
4310}
4311
4312static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4313{
4314 struct inet6_dev *idev = __in6_dev_get(dev);
4315
4316 if (!idev)
4317 return -ENODATA;
4318
4319 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4320 return -EMSGSIZE;
4321
4322 return 0;
4323}
4324
f53adae4
DB		 4325static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4326{
f53adae4
DB		 4327 struct inet6_ifaddr *ifp;
4328 struct net_device *dev = idev->dev;
fc403832 4329 bool update_rs = false;
f53adae4
DB		 4330
4331 if (token == NULL)
4332 return -EINVAL;
4333 if (ipv6_addr_any(token))
4334 return -EINVAL;
4335 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4336 return -EINVAL;
f53adae4
DB		 4337 if (!ipv6_accept_ra(idev))
4338 return -EINVAL;
4339 if (idev->cnf.rtr_solicits <= 0)
4340 return -EINVAL;
4341
4342 write_lock_bh(&idev->lock);
4343
4344 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4345 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4346
4347 write_unlock_bh(&idev->lock);
4348
fc403832
DB		 4349 if (!idev->dead && (idev->if_flags & IF_READY)) {
4350 struct in6_addr ll_addr;
4351
4352 ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4353 IFA_F_OPTIMISTIC);
4354
4355 /* If we're not ready, then normal ifup will take care
4356 * of this. Otherwise, we need to request our rs here.
4357 */
4358 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4359 update_rs = true;
4360 }
f53adae4
DB		 4361
4362 write_lock_bh(&idev->lock);
fc403832
DB		 4363
4364 if (update_rs)
4365 idev->if_flags |= IF_RS_SENT;
f53adae4
DB		 4366
4367 /* Well, that's kinda nasty ... */
4368 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4369 spin_lock(&ifp->lock);
617fe29d 4370 if (ifp->tokenized) {
f53adae4
DB		 4371 ifp->valid_lft = 0;
4372 ifp->prefered_lft = 0;
4373 }
4374 spin_unlock(&ifp->lock);
4375 }
4376
4377 write_unlock_bh(&idev->lock);
2b9651d7 4378 addrconf_verify(0);
f53adae4
DB		 4379 return 0;
4380}
4381
4382static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4383{
4384 int err = -EINVAL;
4385 struct inet6_dev *idev = __in6_dev_get(dev);
4386 struct nlattr *tb[IFLA_INET6_MAX + 1];
4387
4388 if (!idev)
4389 return -EAFNOSUPPORT;
4390
4391 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4392 BUG();
4393
4394 if (tb[IFLA_INET6_TOKEN])
4395 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4396
4397 return err;
4398}
4399
1ab1457c 4400static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4401 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4402{
04561c1f 4403 struct net_device *dev = idev->dev;
04561c1f
TG		 4404 struct ifinfomsg *hdr;
4405 struct nlmsghdr *nlh;
4406 void *protoinfo;
04561c1f 4407
15e47304 4408 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
04561c1f 4409 if (nlh == NULL)
26932566 4410 return -EMSGSIZE;
04561c1f
TG		 4411
4412 hdr = nlmsg_data(nlh);
4413 hdr->ifi_family = AF_INET6;
4414 hdr->__ifi_pad = 0;
4415 hdr->ifi_type = dev->type;
4416 hdr->ifi_index = dev->ifindex;
4417 hdr->ifi_flags = dev_get_flags(dev);
4418 hdr->ifi_change = 0;
4419
c78679e8
DM		 4420 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4421 (dev->addr_len &&
4422 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4423 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4424 (dev->ifindex != dev->iflink &&
4425 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4426 goto nla_put_failure;
04561c1f
TG		 4427 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4428 if (protoinfo == NULL)
4429 goto nla_put_failure;
1da177e4 4430
b382b191 4431 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4432 goto nla_put_failure;
1da177e4 4433
04561c1f
TG		 4434 nla_nest_end(skb, protoinfo);
4435 return nlmsg_end(skb, nlh);
1da177e4 4436
04561c1f 4437nla_put_failure:
26932566
PM		 4438 nlmsg_cancel(skb, nlh);
4439 return -EMSGSIZE;
1da177e4
LT		 4440}
4441
4442static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4443{
3b1e0a65 4444 struct net *net = sock_net(skb->sk);
84d2697d 4445 int h, s_h;
434a8a58 4446 int idx = 0, s_idx;
1da177e4
LT		 4447 struct net_device *dev;
4448 struct inet6_dev *idev;
84d2697d 4449 struct hlist_head *head;
1da177e4 4450
84d2697d
ED		 4451 s_h = cb->args[0];
4452 s_idx = cb->args[1];
4453
4454 rcu_read_lock();
4455 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4456 idx = 0;
4457 head = &net->dev_index_head[h];
b67bfe0d 4458 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 4459 if (idx < s_idx)
4460 goto cont;
4461 idev = __in6_dev_get(dev);
4462 if (!idev)
4463 goto cont;
4464 if (inet6_fill_ifinfo(skb, idev,
15e47304 4465 NETLINK_CB(cb->skb).portid,
84d2697d
ED		 4466 cb->nlh->nlmsg_seq,
4467 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4468 goto out;
7562f876 4469cont:
84d2697d
ED		 4470 idx++;
4471 }
1da177e4 4472 }
84d2697d
ED		 4473out:
4474 rcu_read_unlock();
4475 cb->args[1] = idx;
4476 cb->args[0] = h;
1da177e4
LT		 4477
4478 return skb->len;
4479}
4480
4481void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4482{
4483 struct sk_buff *skb;
c346dca1 4484 struct net *net = dev_net(idev->dev);
8d7a76c9 4485 int err = -ENOBUFS;
1ab1457c 4486
339bf98f 4487 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4488 if (skb == NULL)
4489 goto errout;
4490
4491 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4492 if (err < 0) {
4493 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4494 WARN_ON(err == -EMSGSIZE);
4495 kfree_skb(skb);
4496 goto errout;
4497 }
5f75a104 4498 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4499 return;
8d7a76c9
TG		 4500errout:
4501 if (err < 0)
5f75a104 4502 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4503}
4504
339bf98f
TG		 4505static inline size_t inet6_prefix_nlmsg_size(void)
4506{
4507 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4508 + nla_total_size(sizeof(struct in6_addr))
4509 + nla_total_size(sizeof(struct prefix_cacheinfo));
4510}
c5396a31 4511
1da177e4 4512static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4513 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 4514 int event, unsigned int flags)
1da177e4 4515{
6051e2f4
TG		 4516 struct prefixmsg *pmsg;
4517 struct nlmsghdr *nlh;
1da177e4
LT		 4518 struct prefix_cacheinfo ci;
4519
15e47304 4520 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6051e2f4 4521 if (nlh == NULL)
26932566 4522 return -EMSGSIZE;
6051e2f4
TG		 4523
4524 pmsg = nlmsg_data(nlh);
1da177e4 4525 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4526 pmsg->prefix_pad1 = 0;
4527 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4528 pmsg->prefix_ifindex = idev->dev->ifindex;
4529 pmsg->prefix_len = pinfo->prefix_len;
4530 pmsg->prefix_type = pinfo->type;
8a47077a 4531 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4532 pmsg->prefix_flags = 0;
4533 if (pinfo->onlink)
4534 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4535 if (pinfo->autoconf)
4536 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4537
c78679e8
DM		 4538 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4539 goto nla_put_failure;
1da177e4
LT		 4540 ci.preferred_time = ntohl(pinfo->prefered);
4541 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 4542 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4543 goto nla_put_failure;
6051e2f4 4544 return nlmsg_end(skb, nlh);
1da177e4 4545
6051e2f4 4546nla_put_failure:
26932566
PM		 4547 nlmsg_cancel(skb, nlh);
4548 return -EMSGSIZE;
1da177e4
LT		 4549}
4550
1ab1457c 4551static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4552 struct prefix_info *pinfo)
4553{
4554 struct sk_buff *skb;
c346dca1 4555 struct net *net = dev_net(idev->dev);
8c384bfa 4556 int err = -ENOBUFS;
1da177e4 4557
339bf98f 4558 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4559 if (skb == NULL)
4560 goto errout;
4561
4562 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4563 if (err < 0) {
4564 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4565 WARN_ON(err == -EMSGSIZE);
4566 kfree_skb(skb);
4567 goto errout;
4568 }
1ce85fe4
PNA		 4569 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4570 return;
8c384bfa
TG		 4571errout:
4572 if (err < 0)
6fda7350 4573 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4574}
4575
1da177e4
LT		 4576static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4577{
63998ac2
ND		 4578 struct net *net = dev_net(ifp->idev->dev);
4579
1da177e4
LT		 4580 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4581
4582 switch (event) {
4583 case RTM_NEWADDR:
95c385b4
NH		 4584 /*
4585 * If the address was optimistic
4586 * we inserted the route at the start of
4587 * our DAD process, so we don't need
4588 * to do it again
4589 */
4590 if (!(ifp->rt->rt6i_node))
4591 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4592 if (ifp->idev->cnf.forwarding)
4593 addrconf_join_anycast(ifp);
7996c799 4594 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 4595 addrconf_prefix_route(&ifp->peer_addr, 128,
4596 ifp->idev->dev, 0, 0);
1da177e4
LT		 4597 break;
4598 case RTM_DELADDR:
4599 if (ifp->idev->cnf.forwarding)
4600 addrconf_leave_anycast(ifp);
4601 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 4602 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79
ND		 4603 struct rt6_info *rt;
4604 struct net_device *dev = ifp->idev->dev;
4605
4606 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4607 dev->ifindex, 1);
4608 if (rt) {
4609 dst_hold(&rt->dst);
4610 if (ip6_del_rt(rt))
4611 dst_free(&rt->dst);
4612 }
4613 }
d8d1f30b 4614 dst_hold(&ifp->rt->dst);
93fa159a 4615
73a8bd74 4616 if (ip6_del_rt(ifp->rt))
d8d1f30b 4617 dst_free(&ifp->rt->dst);
1da177e4
LT		 4618 break;
4619 }
63998ac2 4620 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 4621}
4622
4623static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4624{
8814c4b5 4625 rcu_read_lock_bh();
1da177e4
LT		 4626 if (likely(ifp->idev->dead == 0))
4627 __ipv6_ifa_notify(event, ifp);
8814c4b5 4628 rcu_read_unlock_bh();
1da177e4
LT		 4629}
4630
4631#ifdef CONFIG_SYSCTL
4632
4633static
fe2c6338 4634int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 4635 void __user *buffer, size_t *lenp, loff_t *ppos)
4636{
4637 int *valp = ctl->data;
4638 int val = *valp;
88af182e 4639 loff_t pos = *ppos;
fe2c6338 4640 struct ctl_table lctl;
1da177e4
LT		 4641 int ret;
4642
013d97e9
FR		 4643 /*
4644 * ctl->data points to idev->cnf.forwarding, we should
4645 * not modify it until we get the rtnl lock.
4646 */
4647 lctl = *ctl;
4648 lctl.data = &val;
4649
4650 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 4651
c8fecf22 4652 if (write)
b325fddb 4653 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4654 if (ret)
4655 *ppos = pos;
1ab1457c 4656 return ret;
1da177e4
LT		 4657}
4658
56d417b1
BH		 4659static void dev_disable_change(struct inet6_dev *idev)
4660{
75538c2b
CW		 4661 struct netdev_notifier_info info;
4662
56d417b1
BH		 4663 if (!idev || !idev->dev)
4664 return;
4665
75538c2b 4666 netdev_notifier_info_init(&info, idev->dev);
56d417b1 4667 if (idev->cnf.disable_ipv6)
75538c2b 4668 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 4669 else
75538c2b 4670 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 4671}
4672
4673static void addrconf_disable_change(struct net *net, __s32 newf)
4674{
4675 struct net_device *dev;
4676 struct inet6_dev *idev;
4677
c6d14c84
ED		 4678 rcu_read_lock();
4679 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4680 idev = __in6_dev_get(dev);
4681 if (idev) {
4682 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4683 idev->cnf.disable_ipv6 = newf;
4684 if (changed)
4685 dev_disable_change(idev);
4686 }
56d417b1 4687 }
c6d14c84 4688 rcu_read_unlock();
56d417b1
BH		 4689}
4690
013d97e9 4691static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 4692{
4693 struct net *net;
013d97e9
FR		 4694 int old;
4695
4696 if (!rtnl_trylock())
4697 return restart_syscall();
56d417b1
BH		 4698
4699 net = (struct net *)table->extra2;
013d97e9
FR		 4700 old = *p;
4701 *p = newf;
56d417b1 4702
013d97e9
FR		 4703 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4704 rtnl_unlock();
56d417b1 4705 return 0;
88af182e 4706 }
56d417b1
BH		 4707
4708 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 4709 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4710 addrconf_disable_change(net, newf);
013d97e9 4711 } else if ((!newf) ^ (!old))
56d417b1
BH		 4712 dev_disable_change((struct inet6_dev *)table->extra1);
4713
4714 rtnl_unlock();
4715 return 0;
4716}
4717
4718static
fe2c6338 4719int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 4720 void __user *buffer, size_t *lenp, loff_t *ppos)
4721{
4722 int *valp = ctl->data;
4723 int val = *valp;
88af182e 4724 loff_t pos = *ppos;
fe2c6338 4725 struct ctl_table lctl;
56d417b1
BH		 4726 int ret;
4727
013d97e9
FR		 4728 /*
4729 * ctl->data points to idev->cnf.disable_ipv6, we should
4730 * not modify it until we get the rtnl lock.
4731 */
4732 lctl = *ctl;
4733 lctl.data = &val;
4734
4735 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 4736
4737 if (write)
4738 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4739 if (ret)
4740 *ppos = pos;
56d417b1
BH		 4741 return ret;
4742}
4743
1da177e4
LT		 4744static struct addrconf_sysctl_table
4745{
4746 struct ctl_table_header *sysctl_header;
fe2c6338 4747 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 4748} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4749 .sysctl_header = NULL,
4750 .addrconf_vars = {
1ab1457c 4751 {
e21e8467
SH		 4752 .procname = "forwarding",
4753 .data = &ipv6_devconf.forwarding,
4754 .maxlen = sizeof(int),
4755 .mode = 0644,
4756 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4757 },
4758 {
e21e8467
SH		 4759 .procname = "hop_limit",
4760 .data = &ipv6_devconf.hop_limit,
4761 .maxlen = sizeof(int),
4762 .mode = 0644,
4763 .proc_handler = proc_dointvec,
1da177e4
LT		 4764 },
4765 {
e21e8467
SH		 4766 .procname = "mtu",
4767 .data = &ipv6_devconf.mtu6,
4768 .maxlen = sizeof(int),
4769 .mode = 0644,
4770 .proc_handler = proc_dointvec,
1da177e4
LT		 4771 },
4772 {
e21e8467
SH		 4773 .procname = "accept_ra",
4774 .data = &ipv6_devconf.accept_ra,
4775 .maxlen = sizeof(int),
4776 .mode = 0644,
4777 .proc_handler = proc_dointvec,
1da177e4
LT		 4778 },
4779 {
e21e8467
SH		 4780 .procname = "accept_redirects",
4781 .data = &ipv6_devconf.accept_redirects,
4782 .maxlen = sizeof(int),
4783 .mode = 0644,
4784 .proc_handler = proc_dointvec,
1da177e4
LT		 4785 },
4786 {
e21e8467
SH		 4787 .procname = "autoconf",
4788 .data = &ipv6_devconf.autoconf,
4789 .maxlen = sizeof(int),
4790 .mode = 0644,
4791 .proc_handler = proc_dointvec,
1da177e4
LT		 4792 },
4793 {
e21e8467
SH		 4794 .procname = "dad_transmits",
4795 .data = &ipv6_devconf.dad_transmits,
4796 .maxlen = sizeof(int),
4797 .mode = 0644,
4798 .proc_handler = proc_dointvec,
1da177e4
LT		 4799 },
4800 {
e21e8467
SH		 4801 .procname = "router_solicitations",
4802 .data = &ipv6_devconf.rtr_solicits,
4803 .maxlen = sizeof(int),
4804 .mode = 0644,
4805 .proc_handler = proc_dointvec,
1da177e4
LT		 4806 },
4807 {
e21e8467
SH		 4808 .procname = "router_solicitation_interval",
4809 .data = &ipv6_devconf.rtr_solicit_interval,
4810 .maxlen = sizeof(int),
4811 .mode = 0644,
4812 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4813 },
4814 {
e21e8467
SH		 4815 .procname = "router_solicitation_delay",
4816 .data = &ipv6_devconf.rtr_solicit_delay,
4817 .maxlen = sizeof(int),
4818 .mode = 0644,
4819 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4820 },
4821 {
e21e8467
SH		 4822 .procname = "force_mld_version",
4823 .data = &ipv6_devconf.force_mld_version,
4824 .maxlen = sizeof(int),
4825 .mode = 0644,
4826 .proc_handler = proc_dointvec,
1da177e4
LT		 4827 },
4828#ifdef CONFIG_IPV6_PRIVACY
4829 {
e21e8467
SH		 4830 .procname = "use_tempaddr",
4831 .data = &ipv6_devconf.use_tempaddr,
4832 .maxlen = sizeof(int),
4833 .mode = 0644,
4834 .proc_handler = proc_dointvec,
1da177e4
LT		 4835 },
4836 {
e21e8467
SH		 4837 .procname = "temp_valid_lft",
4838 .data = &ipv6_devconf.temp_valid_lft,
4839 .maxlen = sizeof(int),
4840 .mode = 0644,
4841 .proc_handler = proc_dointvec,
1da177e4
LT		 4842 },
4843 {
e21e8467
SH		 4844 .procname = "temp_prefered_lft",
4845 .data = &ipv6_devconf.temp_prefered_lft,
4846 .maxlen = sizeof(int),
4847 .mode = 0644,
4848 .proc_handler = proc_dointvec,
1da177e4
LT		 4849 },
4850 {
e21e8467
SH		 4851 .procname = "regen_max_retry",
4852 .data = &ipv6_devconf.regen_max_retry,
4853 .maxlen = sizeof(int),
4854 .mode = 0644,
4855 .proc_handler = proc_dointvec,
1da177e4
LT		 4856 },
4857 {
e21e8467
SH		 4858 .procname = "max_desync_factor",
4859 .data = &ipv6_devconf.max_desync_factor,
4860 .maxlen = sizeof(int),
4861 .mode = 0644,
4862 .proc_handler = proc_dointvec,
1da177e4
LT		 4863 },
4864#endif
4865 {
e21e8467
SH		 4866 .procname = "max_addresses",
4867 .data = &ipv6_devconf.max_addresses,
4868 .maxlen = sizeof(int),
4869 .mode = 0644,
4870 .proc_handler = proc_dointvec,
1da177e4 4871 },
65f5c7c1 4872 {
e21e8467
SH		 4873 .procname = "accept_ra_defrtr",
4874 .data = &ipv6_devconf.accept_ra_defrtr,
4875 .maxlen = sizeof(int),
4876 .mode = 0644,
4877 .proc_handler = proc_dointvec,
65f5c7c1 4878 },
c4fd30eb 4879 {
e21e8467
SH		 4880 .procname = "accept_ra_pinfo",
4881 .data = &ipv6_devconf.accept_ra_pinfo,
4882 .maxlen = sizeof(int),
4883 .mode = 0644,
4884 .proc_handler = proc_dointvec,
c4fd30eb 4885 },
930d6ff2
YH		 4886#ifdef CONFIG_IPV6_ROUTER_PREF
4887 {
e21e8467
SH		 4888 .procname = "accept_ra_rtr_pref",
4889 .data = &ipv6_devconf.accept_ra_rtr_pref,
4890 .maxlen = sizeof(int),
4891 .mode = 0644,
4892 .proc_handler = proc_dointvec,
930d6ff2 4893 },
52e16356 4894 {
e21e8467
SH		 4895 .procname = "router_probe_interval",
4896 .data = &ipv6_devconf.rtr_probe_interval,
4897 .maxlen = sizeof(int),
4898 .mode = 0644,
4899 .proc_handler = proc_dointvec_jiffies,
52e16356 4900 },
fa03ef38 4901#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4902 {
e21e8467
SH		 4903 .procname = "accept_ra_rt_info_max_plen",
4904 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4905 .maxlen = sizeof(int),
4906 .mode = 0644,
4907 .proc_handler = proc_dointvec,
09c884d4
YH		 4908 },
4909#endif
930d6ff2 4910#endif
fbea49e1 4911 {
e21e8467
SH		 4912 .procname = "proxy_ndp",
4913 .data = &ipv6_devconf.proxy_ndp,
4914 .maxlen = sizeof(int),
4915 .mode = 0644,
4916 .proc_handler = proc_dointvec,
fbea49e1 4917 },
0bcbc926 4918 {
e21e8467
SH		 4919 .procname = "accept_source_route",
4920 .data = &ipv6_devconf.accept_source_route,
4921 .maxlen = sizeof(int),
4922 .mode = 0644,
4923 .proc_handler = proc_dointvec,
0bcbc926 4924 },
95c385b4
NH		 4925#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4926 {
e21e8467
SH		 4927 .procname = "optimistic_dad",
4928 .data = &ipv6_devconf.optimistic_dad,
4929 .maxlen = sizeof(int),
4930 .mode = 0644,
4931 .proc_handler = proc_dointvec,
95c385b4
NH		 4932
4933 },
7bc570c8
YH		 4934#endif
4935#ifdef CONFIG_IPV6_MROUTE
4936 {
e21e8467
SH		 4937 .procname = "mc_forwarding",
4938 .data = &ipv6_devconf.mc_forwarding,
4939 .maxlen = sizeof(int),
4940 .mode = 0444,
4941 .proc_handler = proc_dointvec,
7bc570c8 4942 },
95c385b4 4943#endif
778d80be 4944 {
e21e8467
SH		 4945 .procname = "disable_ipv6",
4946 .data = &ipv6_devconf.disable_ipv6,
4947 .maxlen = sizeof(int),
4948 .mode = 0644,
4949 .proc_handler = addrconf_sysctl_disable,
778d80be 4950 },
1b34be74 4951 {
e21e8467
SH		 4952 .procname = "accept_dad",
4953 .data = &ipv6_devconf.accept_dad,
4954 .maxlen = sizeof(int),
4955 .mode = 0644,
4956 .proc_handler = proc_dointvec,
1b34be74 4957 },
f7734fdf 4958 {
f7734fdf
OP		 4959 .procname = "force_tllao",
4960 .data = &ipv6_devconf.force_tllao,
4961 .maxlen = sizeof(int),
4962 .mode = 0644,
4963 .proc_handler = proc_dointvec
4964 },
5cb04436
HFS		 4965 {
4966 .procname = "ndisc_notify",
4967 .data = &ipv6_devconf.ndisc_notify,
4968 .maxlen = sizeof(int),
4969 .mode = 0644,
4970 .proc_handler = proc_dointvec
4971 },
1da177e4 4972 {
f8572d8f 4973 /* sentinel */
1da177e4
LT		 4974 }
4975 },
1da177e4
LT		 4976};
4977
bff16c2f 4978static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4979 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4980{
4981 int i;
1da177e4 4982 struct addrconf_sysctl_table *t;
6105e293 4983 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 4984
af879cc7 4985 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4986 if (t == NULL)
f68635e6
PE		 4987 goto out;
4988
bcdd553f 4989 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 4990 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 4991 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4992 t->addrconf_vars[i].extra2 = net;
1da177e4 4993 }
1da177e4 4994
6105e293 4995 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 4996
6105e293 4997 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
1da177e4 4998 if (t->sysctl_header == NULL)
6105e293 4999 goto free;
f68635e6
PE		 5000
5001 p->sysctl = t;
95897312 5002 return 0;
1da177e4 5003
f68635e6 5004free:
1da177e4 5005 kfree(t);
f68635e6 5006out:
95897312 5007 return -ENOBUFS;
1da177e4
LT		 5008}
5009
408c4768
PE		 5010static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5011{
5012 struct addrconf_sysctl_table *t;
5013
5014 if (p->sysctl == NULL)
5015 return;
5016
5017 t = p->sysctl;
5018 p->sysctl = NULL;
ff538818 5019 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 5020 kfree(t);
5021}
5022
f52295a9
PE		 5023static void addrconf_sysctl_register(struct inet6_dev *idev)
5024{
54716e3b 5025 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 5026 &ndisc_ifinfo_sysctl_change);
c346dca1 5027 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 5028 idev, &idev->cnf);
f52295a9
PE		 5029}
5030
408c4768 5031static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 5032{
408c4768
PE		 5033 __addrconf_sysctl_unregister(&idev->cnf);
5034 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 5035}
5036
5037
5038#endif
5039
2c8c1e72 5040static int __net_init addrconf_init_net(struct net *net)
e0da5a48 5041{
a79ca223 5042 int err = -ENOMEM;
e0da5a48
PE		 5043 struct ipv6_devconf *all, *dflt;
5044
a79ca223
HZ		 5045 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5046 if (all == NULL)
5047 goto err_alloc_all;
e0da5a48 5048
a79ca223
HZ		 5049 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5050 if (dflt == NULL)
5051 goto err_alloc_dflt;
e0da5a48 5052
a79ca223
HZ		 5053 /* these will be inherited by all namespaces */
5054 dflt->autoconf = ipv6_defaults.autoconf;
5055 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 5056
5057 net->ipv6.devconf_all = all;
5058 net->ipv6.devconf_dflt = dflt;
5059
5060#ifdef CONFIG_SYSCTL
f8572d8f 5061 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 5062 if (err < 0)
5063 goto err_reg_all;
5064
f8572d8f 5065 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 5066 if (err < 0)
5067 goto err_reg_dflt;
5068#endif
5069 return 0;
5070
5071#ifdef CONFIG_SYSCTL
5072err_reg_dflt:
5073 __addrconf_sysctl_unregister(all);
5074err_reg_all:
5075 kfree(dflt);
5076#endif
5077err_alloc_dflt:
5078 kfree(all);
5079err_alloc_all:
5080 return err;
5081}
5082
2c8c1e72 5083static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 5084{
5085#ifdef CONFIG_SYSCTL
5086 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5087 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5088#endif
09ad9bc7 5089 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 5090 kfree(net->ipv6.devconf_dflt);
5091 kfree(net->ipv6.devconf_all);
5092 }
5093}
5094
5095static struct pernet_operations addrconf_ops = {
5096 .init = addrconf_init_net,
5097 .exit = addrconf_exit_net,
5098};
5099
b382b191
TG		 5100static struct rtnl_af_ops inet6_ops = {
5101 .family = AF_INET6,
5102 .fill_link_af = inet6_fill_link_af,
5103 .get_link_af_size = inet6_get_link_af_size,
f53adae4 5104 .set_link_af = inet6_set_link_af,
b382b191
TG		 5105};
5106
1da177e4
LT		 5107/*
5108 * Init / cleanup code
5109 */
5110
5111int __init addrconf_init(void)
5112{
c2e21293 5113 int i, err;
2a8cc6c8 5114
e21e8467
SH		 5115 err = ipv6_addr_label_init();
5116 if (err < 0) {
f3213831
JP		 5117 pr_crit("%s: cannot initialize default policy table: %d\n",
5118 __func__, err);
2cc6d2bf 5119 goto out;
2a8cc6c8 5120 }
1da177e4 5121
2cc6d2bf
NH		 5122 err = register_pernet_subsys(&addrconf_ops);
5123 if (err < 0)
5124 goto out_addrlabel;
e0da5a48 5125
1da177e4
LT		 5126 /* The addrconf netdev notifier requires that loopback_dev
5127 * has it's ipv6 private information allocated and setup
5128 * before it can bring up and give link-local addresses
5129 * to other devices which are up.
5130 *
5131 * Unfortunately, loopback_dev is not necessarily the first
5132 * entry in the global dev_base list of net devices. In fact,
5133 * it is likely to be the very last entry on that list.
5134 * So this causes the notifier registry below to try and
5135 * give link-local addresses to all devices besides loopback_dev
5136 * first, then loopback_dev, which cases all the non-loopback_dev
5137 * devices to fail to get a link-local address.
5138 *
5139 * So, as a temporary fix, allocate the ipv6 structure for
5140 * loopback_dev first by hand.
5141 * Longer term, all of the dependencies ipv6 has upon the loopback
5142 * device and it being up should be removed.
5143 */
5144 rtnl_lock();
2774c7ab 5145 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 5146 err = -ENOMEM;
5147 rtnl_unlock();
5148 if (err)
e0da5a48 5149 goto errlo;
1da177e4 5150
c2e21293 5151 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5152 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5153
1da177e4
LT		 5154 register_netdevice_notifier(&ipv6_dev_notf);
5155
1da177e4 5156 addrconf_verify(0);
c127ea2c 5157
b382b191
TG		 5158 err = rtnl_af_register(&inet6_ops);
5159 if (err < 0)
5160 goto errout_af;
5161
c7ac8679
GR		 5162 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5163 NULL);
c127ea2c
TG		 5164 if (err < 0)
5165 goto errout;
5166
5167 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 5168 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5169 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5170 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5171 inet6_dump_ifaddr, NULL);
5172 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5173 inet6_dump_ifmcaddr, NULL);
5174 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5175 inet6_dump_ifacaddr, NULL);
76f8f6cb 5176 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 5177 inet6_netconf_dump_devconf, NULL);
c127ea2c 5178
2a8cc6c8
YH		 5179 ipv6_addr_label_rtnl_register();
5180
1da177e4 5181 return 0;
c127ea2c 5182errout:
b382b191
TG		 5183 rtnl_af_unregister(&inet6_ops);
5184errout_af:
c127ea2c 5185 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 5186errlo:
5187 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 5188out_addrlabel:
5189 ipv6_addr_label_cleanup();
5190out:
c127ea2c 5191 return err;
1da177e4
LT		 5192}
5193
09f7709f 5194void addrconf_cleanup(void)
1da177e4 5195{
176c39af 5196 struct net_device *dev;
1da177e4
LT		 5197 int i;
5198
5199 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5200 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 5201 ipv6_addr_label_cleanup();
1da177e4
LT		 5202
5203 rtnl_lock();
5204
b382b191
TG		 5205 __rtnl_af_unregister(&inet6_ops);
5206
176c39af
DL		 5207 /* clean dev list */
5208 for_each_netdev(&init_net, dev) {
5209 if (__in6_dev_get(dev) == NULL)
5210 continue;
5211 addrconf_ifdown(dev, 1);
5212 }
5213 addrconf_ifdown(init_net.loopback_dev, 2);
5214
1da177e4
LT		 5215 /*
5216 * Check hash table.
5217 */
5c578aed 5218 spin_lock_bh(&addrconf_hash_lock);
c2e21293 5219 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5220 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 5221 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 5222
5223 del_timer(&addr_chk_timer);
1da177e4 5224 rtnl_unlock();
1da177e4 5225}
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