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CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
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 * <chexum@bankinf.banki.hu>
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 48#include <linux/net.h>
3d1bec99 49#include <linux/inet.h>
1da177e4
LT		 50#include <linux/in6.h>
51#include <linux/netdevice.h>
1823730f 52#include <linux/if_addr.h>
1da177e4
LT		 53#include <linux/if_arp.h>
54#include <linux/if_arcnet.h>
55#include <linux/if_infiniband.h>
56#include <linux/route.h>
57#include <linux/inetdevice.h>
58#include <linux/init.h>
5a0e3ad6 59#include <linux/slab.h>
1da177e4
LT		 60#ifdef CONFIG_SYSCTL
61#include <linux/sysctl.h>
62#endif
4fc268d2 63#include <linux/capability.h>
1da177e4
LT		 64#include <linux/delay.h>
65#include <linux/notifier.h>
543537bd 66#include <linux/string.h>
ddbe5032 67#include <linux/hash.h>
1da177e4 68
457c4cbc 69#include <net/net_namespace.h>
1da177e4
LT		 70#include <net/sock.h>
71#include <net/snmp.h>
72
06a4c1c5 73#include <net/af_ieee802154.h>
cb6bf355 74#include <net/firewire.h>
1da177e4
LT		 75#include <net/ipv6.h>
76#include <net/protocol.h>
77#include <net/ndisc.h>
78#include <net/ip6_route.h>
79#include <net/addrconf.h>
80#include <net/tcp.h>
81#include <net/ip.h>
5d620266 82#include <net/netlink.h>
f24e3d65 83#include <net/pkt_sched.h>
1da177e4
LT		 84#include <linux/if_tunnel.h>
85#include <linux/rtnetlink.h>
f3a1bfb1 86#include <linux/netconf.h>
1da177e4 87#include <linux/random.h>
e21e8467 88#include <linux/uaccess.h>
7f7d9a6b 89#include <asm/unaligned.h>
1da177e4
LT		 90
91#include <linux/proc_fs.h>
92#include <linux/seq_file.h>
bc3b2d7f 93#include <linux/export.h>
1da177e4
LT		 94
95/* Set to 3 to get tracing... */
96#define ACONF_DEBUG 2
97
98#if ACONF_DEBUG >= 3
ba3542e1 99#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
1da177e4 100#else
ba3542e1 101#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
1da177e4
LT		 102#endif
103
104#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e 105
3d1bec99
HFS		 106#define IPV6_MAX_STRLEN \
107 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
108
18a31e1e
TG		 109static inline u32 cstamp_delta(unsigned long cstamp)
110{
111 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
112}
1da177e4
LT		 113
114#ifdef CONFIG_SYSCTL
a317a2f1 115static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 116static void addrconf_sysctl_unregister(struct inet6_dev *idev);
117#else
a317a2f1 118static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 119{
a317a2f1 120 return 0;
408c4768
PE		 121}
122
123static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
124{
125}
1da177e4
LT		 126#endif
127
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 131
1b34be74 132static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4 133static int ipv6_count_addresses(struct inet6_dev *idev);
622c81d5
HFS		 134static int ipv6_generate_stable_address(struct in6_addr *addr,
135 u8 dad_count,
136 const struct inet6_dev *idev);
1da177e4
LT		 137
138/*
139 * Configured unicast address hash table
140 */
c2e21293 141static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 142static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 143
c15b1cca
HFS		 144static void addrconf_verify(void);
145static void addrconf_verify_rtnl(void);
146static void addrconf_verify_work(struct work_struct *);
1da177e4 147
c15b1cca
HFS		 148static struct workqueue_struct *addrconf_wq;
149static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 150
151static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
152static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
153
93d9b7d7
JP		 154static void addrconf_type_change(struct net_device *dev,
155 unsigned long event);
1da177e4
LT		 156static int addrconf_ifdown(struct net_device *dev, int how);
157
21caa662
RK		 158static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
159 int plen,
160 const struct net_device *dev,
161 u32 flags, u32 noflags);
162
cf22f9a2 163static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 164static void addrconf_dad_work(struct work_struct *w);
1da177e4 165static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 166static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 167static void addrconf_rs_timer(unsigned long data);
168static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
169static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
170
1ab1457c 171static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 172 struct prefix_info *pinfo);
3e81c6da
DM		 173static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
174 struct net_device *dev);
1da177e4 175
888c848e 176static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 177 .forwarding = 0,
178 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
179 .mtu6 = IPV6_MIN_MTU,
180 .accept_ra = 1,
181 .accept_redirects = 1,
182 .autoconf = 1,
183 .force_mld_version = 0,
fc4eba58
HFS		 184 .mldv1_unsolicited_report_interval = 10 * HZ,
185 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 186 .dad_transmits = 1,
187 .rtr_solicits = MAX_RTR_SOLICITATIONS,
188 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
189 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 190 .use_tempaddr = 0,
1da177e4
LT		 191 .temp_valid_lft = TEMP_VALID_LIFETIME,
192 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
193 .regen_max_retry = REGEN_MAX_RETRY,
194 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 195 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 196 .accept_ra_defrtr = 1,
d9333196 197 .accept_ra_from_local = 0,
8013d1d7 198 .accept_ra_min_hop_limit= 1,
c4fd30eb 199 .accept_ra_pinfo = 1,
930d6ff2
YH		 200#ifdef CONFIG_IPV6_ROUTER_PREF
201 .accept_ra_rtr_pref = 1,
52e16356 202 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 203#ifdef CONFIG_IPV6_ROUTE_INFO
204 .accept_ra_rt_info_max_plen = 0,
205#endif
930d6ff2 206#endif
fbea49e1 207 .proxy_ndp = 0,
0bcbc926 208 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 209 .disable_ipv6 = 0,
1b34be74 210 .accept_dad = 1,
b800c3b9 211 .suppress_frag_ndisc = 1,
c2943f14 212 .accept_ra_mtu = 1,
3d1bec99
HFS		 213 .stable_secret = {
214 .initialized = false,
3985e8a3
EK		 215 },
216 .use_oif_addrs_only = 0,
1da177e4
LT		 217};
218
ab32ea5d 219static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 220 .forwarding = 0,
221 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
222 .mtu6 = IPV6_MIN_MTU,
223 .accept_ra = 1,
224 .accept_redirects = 1,
225 .autoconf = 1,
fc4eba58
HFS		 226 .force_mld_version = 0,
227 .mldv1_unsolicited_report_interval = 10 * HZ,
228 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 229 .dad_transmits = 1,
230 .rtr_solicits = MAX_RTR_SOLICITATIONS,
231 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
232 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 233 .use_tempaddr = 0,
234 .temp_valid_lft = TEMP_VALID_LIFETIME,
235 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
236 .regen_max_retry = REGEN_MAX_RETRY,
237 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 238 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 239 .accept_ra_defrtr = 1,
d9333196 240 .accept_ra_from_local = 0,
8013d1d7 241 .accept_ra_min_hop_limit= 1,
c4fd30eb 242 .accept_ra_pinfo = 1,
930d6ff2
YH		 243#ifdef CONFIG_IPV6_ROUTER_PREF
244 .accept_ra_rtr_pref = 1,
52e16356 245 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 246#ifdef CONFIG_IPV6_ROUTE_INFO
247 .accept_ra_rt_info_max_plen = 0,
248#endif
930d6ff2 249#endif
fbea49e1 250 .proxy_ndp = 0,
0bcbc926 251 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 252 .disable_ipv6 = 0,
1b34be74 253 .accept_dad = 1,
b800c3b9 254 .suppress_frag_ndisc = 1,
c2943f14 255 .accept_ra_mtu = 1,
3d1bec99
HFS		 256 .stable_secret = {
257 .initialized = false,
258 },
3985e8a3 259 .use_oif_addrs_only = 0,
1da177e4
LT		 260};
261
f24e3d65 262/* Check if a valid qdisc is available */
05297949 263static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 264{
05297949 265 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 266}
267
b7b1bfce 268static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 269{
b7b1bfce
HFS		 270 if (del_timer(&idev->rs_timer))
271 __in6_dev_put(idev);
272}
273
c15b1cca 274static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 275{
c15b1cca 276 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 277 __in6_ifa_put(ifp);
278}
279
b7b1bfce
HFS		 280static void addrconf_mod_rs_timer(struct inet6_dev *idev,
281 unsigned long when)
282{
283 if (!timer_pending(&idev->rs_timer))
284 in6_dev_hold(idev);
285 mod_timer(&idev->rs_timer, jiffies + when);
286}
1da177e4 287
c15b1cca
HFS		 288static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
289 unsigned long delay)
1da177e4 290{
c15b1cca 291 if (!delayed_work_pending(&ifp->dad_work))
1da177e4 292 in6_ifa_hold(ifp);
c15b1cca 293 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
1da177e4
LT		 294}
295
7f7d9a6b
HX		 296static int snmp6_alloc_dev(struct inet6_dev *idev)
297{
827da44c
JS		 298 int i;
299
698365fa
WC		 300 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
301 if (!idev->stats.ipv6)
7f7d9a6b 302 goto err_ip;
827da44c
JS		 303
304 for_each_possible_cpu(i) {
305 struct ipstats_mib *addrconf_stats;
698365fa 306 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 307 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 308 }
309
310
be281e55
ED		 311 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
312 GFP_KERNEL);
313 if (!idev->stats.icmpv6dev)
7f7d9a6b 314 goto err_icmp;
be281e55
ED		 315 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
316 GFP_KERNEL);
317 if (!idev->stats.icmpv6msgdev)
14878f75 318 goto err_icmpmsg;
7f7d9a6b
HX		 319
320 return 0;
321
14878f75 322err_icmpmsg:
be281e55 323 kfree(idev->stats.icmpv6dev);
7f7d9a6b 324err_icmp:
698365fa 325 free_percpu(idev->stats.ipv6);
7f7d9a6b 326err_ip:
aaf70ec7 327 return -ENOMEM;
7f7d9a6b
HX		 328}
329
8e5e8f30 330static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 331{
332 struct inet6_dev *ndev;
a317a2f1 333 int err = -ENOMEM;
1da177e4
LT		 334
335 ASSERT_RTNL();
336
337 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 338 return ERR_PTR(-EINVAL);
1da177e4 339
1ab1457c 340 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
63159f29 341 if (!ndev)
a317a2f1 342 return ERR_PTR(err);
322f74a4
IO		 343
344 rwlock_init(&ndev->lock);
345 ndev->dev = dev;
502a2ffd 346 INIT_LIST_HEAD(&ndev->addr_list);
b7b1bfce
HFS		 347 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
348 (unsigned long)ndev);
c346dca1 349 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 350 ndev->cnf.mtu6 = dev->mtu;
351 ndev->cnf.sysctl = NULL;
352 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
63159f29 353 if (!ndev->nd_parms) {
322f74a4 354 kfree(ndev);
a317a2f1 355 return ERR_PTR(err);
322f74a4 356 }
0187bdfb
BH		 357 if (ndev->cnf.forwarding)
358 dev_disable_lro(dev);
322f74a4
IO		 359 /* We refer to the device */
360 dev_hold(dev);
1da177e4 361
322f74a4 362 if (snmp6_alloc_dev(ndev) < 0) {
ba3542e1 363 ADBG(KERN_WARNING
f3213831 364 "%s: cannot allocate memory for statistics; dev=%s.\n",
ba3542e1 365 __func__, dev->name);
322f74a4 366 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 367 dev_put(dev);
368 kfree(ndev);
a317a2f1 369 return ERR_PTR(err);
322f74a4 370 }
1da177e4 371
322f74a4 372 if (snmp6_register_dev(ndev) < 0) {
ba3542e1 373 ADBG(KERN_WARNING
f3213831 374 "%s: cannot create /proc/net/dev_snmp6/%s\n",
ba3542e1 375 __func__, dev->name);
a317a2f1 376 goto err_release;
322f74a4
IO		 377 }
378
379 /* One reference from device. We must do this before
380 * we invoke __ipv6_regen_rndid().
381 */
382 in6_dev_hold(ndev);
1da177e4 383
1b34be74
YH		 384 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
385 ndev->cnf.accept_dad = -1;
386
07a93626 387#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 388 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 389 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 390 ndev->cnf.rtr_solicits = 0;
391 }
392#endif
393
372e6c8f 394 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 395 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 396 if ((dev->flags&IFF_LOOPBACK) ||
397 dev->type == ARPHRD_TUNNEL ||
9625ed72 398 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 399 dev->type == ARPHRD_SIT ||
0be669bb 400 dev->type == ARPHRD_NONE) {
322f74a4
IO		 401 ndev->cnf.use_tempaddr = -1;
402 } else {
403 in6_dev_hold(ndev);
404 ipv6_regen_rndid((unsigned long) ndev);
405 }
5d9efa7e 406
914faa14 407 ndev->token = in6addr_any;
1da177e4 408
f24e3d65 409 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 410 ndev->if_flags |= IF_READY;
411
322f74a4
IO		 412 ipv6_mc_init_dev(ndev);
413 ndev->tstamp = jiffies;
a317a2f1
WC		 414 err = addrconf_sysctl_register(ndev);
415 if (err) {
416 ipv6_mc_destroy_dev(ndev);
417 del_timer(&ndev->regen_timer);
418 goto err_release;
419 }
30c4cf57 420 /* protected by rtnl_lock */
cf778b00 421 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 422
2c5e8933
HFS		 423 /* Join interface-local all-node multicast group */
424 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
425
d88ae4cc 426 /* Join all-node multicast group */
f3ee4010 427 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 428
d6ddef9e 429 /* Join all-router multicast group if forwarding is set */
8b2aaede 430 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 431 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
432
1da177e4 433 return ndev;
a317a2f1
WC		 434
435err_release:
436 neigh_parms_release(&nd_tbl, ndev->nd_parms);
437 ndev->dead = 1;
438 in6_dev_finish_destroy(ndev);
439 return ERR_PTR(err);
1da177e4
LT		 440}
441
8e5e8f30 442static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 443{
444 struct inet6_dev *idev;
445
446 ASSERT_RTNL();
447
e21e8467
SH		 448 idev = __in6_dev_get(dev);
449 if (!idev) {
450 idev = ipv6_add_dev(dev);
a317a2f1 451 if (IS_ERR(idev))
1da177e4
LT		 452 return NULL;
453 }
c5e33bdd 454
1da177e4
LT		 455 if (dev->flags&IFF_UP)
456 ipv6_mc_up(idev);
457 return idev;
458}
459
f3a1bfb1
ND		 460static int inet6_netconf_msgsize_devconf(int type)
461{
462 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
463 + nla_total_size(4); /* NETCONFA_IFINDEX */
464
76f8f6cb
ND		 465 /* type -1 is used for ALL */
466 if (type == -1 || type == NETCONFA_FORWARDING)
f3a1bfb1 467 size += nla_total_size(4);
b1afce95 468#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 469 if (type == -1 || type == NETCONFA_MC_FORWARDING)
470 size += nla_total_size(4);
b1afce95 471#endif
c92d5491 472 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
473 size += nla_total_size(4);
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);
63159f29 488 if (!nlh)
f3a1bfb1
ND		 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
c92d5491 507 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
508 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
509 goto nla_put_failure;
510
053c095a
JB		 511 nlmsg_end(skb, nlh);
512 return 0;
f3a1bfb1
ND		 513
514nla_put_failure:
515 nlmsg_cancel(skb, nlh);
516 return -EMSGSIZE;
517}
518
d67b8c61
ND		 519void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
520 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 521{
522 struct sk_buff *skb;
523 int err = -ENOBUFS;
524
525 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
63159f29 526 if (!skb)
f3a1bfb1
ND		 527 goto errout;
528
529 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
530 RTM_NEWNETCONF, 0, type);
531 if (err < 0) {
532 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
533 WARN_ON(err == -EMSGSIZE);
534 kfree_skb(skb);
535 goto errout;
536 }
537 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
538 return;
539errout:
bd779028 540 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 541}
542
76f8f6cb
ND		 543static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
544 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
545 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 546 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
76f8f6cb
ND		 547};
548
549static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 550 struct nlmsghdr *nlh)
76f8f6cb
ND		 551{
552 struct net *net = sock_net(in_skb->sk);
553 struct nlattr *tb[NETCONFA_MAX+1];
554 struct netconfmsg *ncm;
555 struct sk_buff *skb;
556 struct ipv6_devconf *devconf;
557 struct inet6_dev *in6_dev;
558 struct net_device *dev;
559 int ifindex;
560 int err;
561
562 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
563 devconf_ipv6_policy);
564 if (err < 0)
565 goto errout;
566
567 err = EINVAL;
568 if (!tb[NETCONFA_IFINDEX])
569 goto errout;
570
571 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
572 switch (ifindex) {
573 case NETCONFA_IFINDEX_ALL:
574 devconf = net->ipv6.devconf_all;
575 break;
576 case NETCONFA_IFINDEX_DEFAULT:
577 devconf = net->ipv6.devconf_dflt;
578 break;
579 default:
580 dev = __dev_get_by_index(net, ifindex);
63159f29 581 if (!dev)
76f8f6cb
ND		 582 goto errout;
583 in6_dev = __in6_dev_get(dev);
63159f29 584 if (!in6_dev)
76f8f6cb
ND		 585 goto errout;
586 devconf = &in6_dev->cnf;
587 break;
588 }
589
590 err = -ENOBUFS;
591 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
63159f29 592 if (!skb)
76f8f6cb
ND		 593 goto errout;
594
595 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
596 NETLINK_CB(in_skb).portid,
597 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
598 -1);
599 if (err < 0) {
600 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
601 WARN_ON(err == -EMSGSIZE);
602 kfree_skb(skb);
603 goto errout;
604 }
605 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
606errout:
607 return err;
608}
609
7a674200
ND		 610static int inet6_netconf_dump_devconf(struct sk_buff *skb,
611 struct netlink_callback *cb)
612{
613 struct net *net = sock_net(skb->sk);
614 int h, s_h;
615 int idx, s_idx;
616 struct net_device *dev;
617 struct inet6_dev *idev;
618 struct hlist_head *head;
619
620 s_h = cb->args[0];
621 s_idx = idx = cb->args[1];
622
623 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
624 idx = 0;
625 head = &net->dev_index_head[h];
626 rcu_read_lock();
63998ac2
ND		 627 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
628 net->dev_base_seq;
7a674200
ND		 629 hlist_for_each_entry_rcu(dev, head, index_hlist) {
630 if (idx < s_idx)
631 goto cont;
632 idev = __in6_dev_get(dev);
633 if (!idev)
634 goto cont;
635
636 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
637 &idev->cnf,
638 NETLINK_CB(cb->skb).portid,
639 cb->nlh->nlmsg_seq,
640 RTM_NEWNETCONF,
641 NLM_F_MULTI,
053c095a 642 -1) < 0) {
7a674200
ND		 643 rcu_read_unlock();
644 goto done;
645 }
63998ac2 646 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 647cont:
648 idx++;
649 }
650 rcu_read_unlock();
651 }
652 if (h == NETDEV_HASHENTRIES) {
653 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
654 net->ipv6.devconf_all,
655 NETLINK_CB(cb->skb).portid,
656 cb->nlh->nlmsg_seq,
657 RTM_NEWNETCONF, NLM_F_MULTI,
053c095a 658 -1) < 0)
7a674200
ND		 659 goto done;
660 else
661 h++;
662 }
663 if (h == NETDEV_HASHENTRIES + 1) {
664 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
665 net->ipv6.devconf_dflt,
666 NETLINK_CB(cb->skb).portid,
667 cb->nlh->nlmsg_seq,
668 RTM_NEWNETCONF, NLM_F_MULTI,
053c095a 669 -1) < 0)
7a674200
ND		 670 goto done;
671 else
672 h++;
673 }
674done:
675 cb->args[0] = h;
676 cb->args[1] = idx;
677
678 return skb->len;
679}
680
1da177e4
LT		 681#ifdef CONFIG_SYSCTL
682static void dev_forward_change(struct inet6_dev *idev)
683{
684 struct net_device *dev;
685 struct inet6_ifaddr *ifa;
1da177e4
LT		 686
687 if (!idev)
688 return;
689 dev = idev->dev;
0187bdfb
BH		 690 if (idev->cnf.forwarding)
691 dev_disable_lro(dev);
1a940835 692 if (dev->flags & IFF_MULTICAST) {
2c5e8933 693 if (idev->cnf.forwarding) {
f3ee4010 694 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 695 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
696 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
697 } else {
f3ee4010 698 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 699 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
700 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
701 }
1da177e4 702 }
502a2ffd 703
704 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 705 if (ifa->flags&IFA_F_TENTATIVE)
706 continue;
1da177e4
LT		 707 if (idev->cnf.forwarding)
708 addrconf_join_anycast(ifa);
709 else
710 addrconf_leave_anycast(ifa);
711 }
f3a1bfb1
ND		 712 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
713 dev->ifindex, &idev->cnf);
1da177e4
LT		 714}
715
716
e186932b 717static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 718{
719 struct net_device *dev;
720 struct inet6_dev *idev;
721
4acd4945 722 for_each_netdev(net, dev) {
1da177e4
LT		 723 idev = __in6_dev_get(dev);
724 if (idev) {
e186932b
PE		 725 int changed = (!idev->cnf.forwarding) ^ (!newf);
726 idev->cnf.forwarding = newf;
1da177e4
LT		 727 if (changed)
728 dev_forward_change(idev);
729 }
1da177e4 730 }
1da177e4 731}
c8fecf22 732
013d97e9 733static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 734{
bff16c2f 735 struct net *net;
013d97e9
FR		 736 int old;
737
738 if (!rtnl_trylock())
739 return restart_syscall();
bff16c2f
PE		 740
741 net = (struct net *)table->extra2;
013d97e9
FR		 742 old = *p;
743 *p = newf;
b325fddb 744
013d97e9 745 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 746 if ((!newf) ^ (!old))
747 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
748 NETCONFA_IFINDEX_DEFAULT,
749 net->ipv6.devconf_dflt);
013d97e9
FR		 750 rtnl_unlock();
751 return 0;
88af182e 752 }
c8fecf22 753
e186932b 754 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 755 net->ipv6.devconf_dflt->forwarding = newf;
756 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 757 if ((!newf) ^ (!old))
758 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
759 NETCONFA_IFINDEX_ALL,
760 net->ipv6.devconf_all);
013d97e9 761 } else if ((!newf) ^ (!old))
c8fecf22 762 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 763 rtnl_unlock();
c8fecf22 764
013d97e9 765 if (newf)
7b4da532 766 rt6_purge_dflt_routers(net);
b325fddb 767 return 1;
c8fecf22 768}
1da177e4
LT		 769#endif
770
5c578aed 771/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 772void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
773{
c2e21293 774 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 775
1da177e4 776#ifdef NET_REFCNT_DEBUG
91df42be 777 pr_debug("%s\n", __func__);
1da177e4
LT		 778#endif
779
780 in6_dev_put(ifp->idev);
781
c15b1cca
HFS		 782 if (cancel_delayed_work(&ifp->dad_work))
783 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
784 ifp);
1da177e4 785
e9d3e084 786 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 787 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 788 return;
789 }
94e187c0 790 ip6_rt_put(ifp->rt);
1da177e4 791
e5785985 792 kfree_rcu(ifp, rcu);
1da177e4
LT		 793}
794
e55ffac6
BH		 795static void
796ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
797{
502a2ffd 798 struct list_head *p;
8a6ce0c0 799 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 800
801 /*
802 * Each device address list is sorted in order of scope -
803 * global before linklocal.
804 */
502a2ffd 805 list_for_each(p, &idev->addr_list) {
806 struct inet6_ifaddr *ifa
807 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 808 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 809 break;
810 }
811
b54c9b98 812 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 813}
814
ddbe5032 815static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 816{
ddbe5032 817 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 818}
819
1da177e4
LT		 820/* On success it returns ifp with increased reference count */
821
822static struct inet6_ifaddr *
3f8f5298
JP		 823ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
824 const struct in6_addr *peer_addr, int pfxlen,
8a226b2c 825 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
1da177e4
LT		 826{
827 struct inet6_ifaddr *ifa = NULL;
828 struct rt6_info *rt;
3a88a81d 829 unsigned int hash;
1da177e4 830 int err = 0;
d68b8270
YH		 831 int addr_type = ipv6_addr_type(addr);
832
833 if (addr_type == IPV6_ADDR_ANY ||
834 addr_type & IPV6_ADDR_MULTICAST ||
835 (!(idev->dev->flags & IFF_LOOPBACK) &&
836 addr_type & IPV6_ADDR_LOOPBACK))
837 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 838
8814c4b5 839 rcu_read_lock_bh();
1da177e4
LT		 840 if (idev->dead) {
841 err = -ENODEV; /*XXX*/
842 goto out2;
843 }
844
56d417b1 845 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 846 err = -EACCES;
847 goto out2;
848 }
849
5c578aed 850 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 851
852 /* Ignore adding duplicate addresses on an interface */
c346dca1 853 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ba3542e1 854 ADBG("ipv6_add_addr: already assigned\n");
1da177e4
LT		 855 err = -EEXIST;
856 goto out;
857 }
858
322f74a4 859 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4 860
63159f29 861 if (!ifa) {
ba3542e1 862 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 863 err = -ENOBUFS;
864 goto out;
865 }
866
8f031519 867 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 868 if (IS_ERR(rt)) {
869 err = PTR_ERR(rt);
870 goto out;
871 }
872
bba24896
JP		 873 neigh_parms_data_state_setall(idev->nd_parms);
874
4e3fd7a0 875 ifa->addr = *addr;
3f8f5298
JP		 876 if (peer_addr)
877 ifa->peer_addr = *peer_addr;
1da177e4
LT		 878
879 spin_lock_init(&ifa->lock);
c15b1cca 880 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 881 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 882 ifa->scope = scope;
883 ifa->prefix_len = pfxlen;
884 ifa->flags = flags | IFA_F_TENTATIVE;
8a226b2c
JB		 885 ifa->valid_lft = valid_lft;
886 ifa->prefered_lft = prefered_lft;
1da177e4 887 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 888 ifa->tokenized = false;
1da177e4 889
57f5f544
KF		 890 ifa->rt = rt;
891
1da177e4
LT		 892 ifa->idev = idev;
893 in6_dev_hold(idev);
894 /* For caller */
895 in6_ifa_hold(ifa);
896
897 /* Add to big hash table */
ddbe5032 898 hash = inet6_addr_hash(addr);
1da177e4 899
5c578aed 900 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 901 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 902
903 write_lock(&idev->lock);
904 /* Add to inet6_dev unicast addr list. */
e55ffac6 905 ipv6_link_dev_addr(idev, ifa);
1da177e4 906
1da177e4 907 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 908 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 909 in6_ifa_hold(ifa);
910 }
1da177e4 911
1da177e4
LT		 912 in6_ifa_hold(ifa);
913 write_unlock(&idev->lock);
914out2:
8814c4b5 915 rcu_read_unlock_bh();
1da177e4 916
fd92833a 917 if (likely(err == 0))
f88c91dd 918 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 919 else {
920 kfree(ifa);
921 ifa = ERR_PTR(err);
922 }
923
924 return ifa;
925out:
5c578aed 926 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 927 goto out2;
928}
929
5b84efec
TH		 930enum cleanup_prefix_rt_t {
931 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
932 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
933 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
934};
935
936/*
937 * Check, whether the prefix for ifp would still need a prefix route
938 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
939 * constants.
940 *
941 * 1) we don't purge prefix if address was not permanent.
942 * prefix is managed by its own lifetime.
943 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
944 * 3) if there are no addresses, delete prefix.
945 * 4) if there are still other permanent address(es),
946 * corresponding prefix is still permanent.
947 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
948 * don't purge the prefix, assume user space is managing it.
949 * 6) otherwise, update prefix lifetime to the
950 * longest valid lifetime among the corresponding
951 * addresses on the device.
952 * Note: subsequent RA will update lifetime.
953 **/
954static enum cleanup_prefix_rt_t
955check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
956{
957 struct inet6_ifaddr *ifa;
958 struct inet6_dev *idev = ifp->idev;
959 unsigned long lifetime;
960 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
961
962 *expires = jiffies;
963
964 list_for_each_entry(ifa, &idev->addr_list, if_list) {
965 if (ifa == ifp)
966 continue;
967 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
968 ifp->prefix_len))
969 continue;
970 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
971 return CLEANUP_PREFIX_RT_NOP;
972
973 action = CLEANUP_PREFIX_RT_EXPIRE;
974
975 spin_lock(&ifa->lock);
976
977 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
978 /*
979 * Note: Because this address is
980 * not permanent, lifetime <
981 * LONG_MAX / HZ here.
982 */
983 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
984 *expires = ifa->tstamp + lifetime * HZ;
985 spin_unlock(&ifa->lock);
986 }
987
988 return action;
989}
990
991static void
992cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
993{
994 struct rt6_info *rt;
995
996 rt = addrconf_get_prefix_route(&ifp->addr,
997 ifp->prefix_len,
998 ifp->idev->dev,
999 0, RTF_GATEWAY | RTF_DEFAULT);
1000 if (rt) {
1001 if (del_rt)
1002 ip6_del_rt(rt);
1003 else {
1004 if (!(rt->rt6i_flags & RTF_EXPIRES))
1005 rt6_set_expires(rt, expires);
1006 ip6_rt_put(rt);
1007 }
1008 }
1009}
1010
1011
1da177e4
LT		 1012/* This function wants to get referenced ifp and releases it before return */
1013
1014static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1015{
4c5ff6a6 1016 int state;
5b84efec
TH		 1017 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1018 unsigned long expires;
1da177e4 1019
c15b1cca
HFS		 1020 ASSERT_RTNL();
1021
8e8e676d 1022 spin_lock_bh(&ifp->lock);
4c5ff6a6 1023 state = ifp->state;
e9d3e084 1024 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1025 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1026
1027 if (state == INET6_IFADDR_STATE_DEAD)
1028 goto out;
1da177e4 1029
5c578aed 1030 spin_lock_bh(&addrconf_hash_lock);
1031 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1032 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1033
5b84efec 1034 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1035
1da177e4 1036 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1037 list_del(&ifp->tmp_list);
1038 if (ifp->ifpub) {
1039 in6_ifa_put(ifp->ifpub);
1040 ifp->ifpub = NULL;
1da177e4 1041 }
372e6c8f 1042 __in6_ifa_put(ifp);
1da177e4 1043 }
1da177e4 1044
5b84efec
TH		 1045 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1046 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1047
5b84efec
TH		 1048 list_del_init(&ifp->if_list);
1049 __in6_ifa_put(ifp);
1050
1051 write_unlock_bh(&ifp->idev->lock);
1da177e4 1052
c15b1cca 1053 addrconf_del_dad_work(ifp);
b2238566 1054
1da177e4
LT		 1055 ipv6_ifa_notify(RTM_DELADDR, ifp);
1056
f88c91dd 1057 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1058
5b84efec
TH		 1059 if (action != CLEANUP_PREFIX_RT_NOP) {
1060 cleanup_prefix_route(ifp, expires,
1061 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1062 }
1063
c3968a85
DW		 1064 /* clean up prefsrc entries */
1065 rt6_remove_prefsrc(ifp);
4c5ff6a6 1066out:
1da177e4
LT		 1067 in6_ifa_put(ifp);
1068}
1069
1da177e4
LT		 1070static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1071{
1072 struct inet6_dev *idev = ifp->idev;
1073 struct in6_addr addr, *tmpaddr;
76f793e3 1074 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1075 unsigned long regen_advance;
1da177e4
LT		 1076 int tmp_plen;
1077 int ret = 0;
95c385b4 1078 u32 addr_flags;
76f793e3 1079 unsigned long now = jiffies;
1da177e4 1080
53bd6749 1081 write_lock_bh(&idev->lock);
1da177e4
LT		 1082 if (ift) {
1083 spin_lock_bh(&ift->lock);
1084 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1085 spin_unlock_bh(&ift->lock);
1086 tmpaddr = &addr;
1087 } else {
1088 tmpaddr = NULL;
1089 }
1090retry:
1091 in6_dev_hold(idev);
1092 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1093 write_unlock_bh(&idev->lock);
f3213831 1094 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1095 in6_dev_put(idev);
1096 ret = -1;
1097 goto out;
1098 }
1099 spin_lock_bh(&ifp->lock);
1100 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1101 idev->cnf.use_tempaddr = -1; /*XXX*/
1102 spin_unlock_bh(&ifp->lock);
53bd6749 1103 write_unlock_bh(&idev->lock);
f3213831
JP		 1104 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1105 __func__);
1da177e4
LT		 1106 in6_dev_put(idev);
1107 ret = -1;
1108 goto out;
1109 }
1110 in6_ifa_hold(ifp);
1111 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 1112 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1113 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1114 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 1115 tmp_valid_lft = min_t(__u32,
1116 ifp->valid_lft,
7a876b0e 1117 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 1118 tmp_prefered_lft = min_t(__u32,
1119 ifp->prefered_lft,
7a876b0e 1120 idev->cnf.temp_prefered_lft + age -
784e2710 1121 idev->cnf.max_desync_factor);
1da177e4 1122 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1123 tmp_tstamp = ifp->tstamp;
1124 spin_unlock_bh(&ifp->lock);
1125
eac55bf9 1126 regen_advance = idev->cnf.regen_max_retry *
67ba4152
IM		 1127 idev->cnf.dad_transmits *
1128 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
53bd6749 1129 write_unlock_bh(&idev->lock);
95c385b4 1130
eac55bf9
BB		 1131 /* A temporary address is created only if this calculated Preferred
1132 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1133 * an implementation must not create a temporary address with a zero
1134 * Preferred Lifetime.
ecab6701
HK		 1135 * Use age calculation as in addrconf_verify to avoid unnecessary
1136 * temporary addresses being generated.
eac55bf9 1137 */
ecab6701
HK		 1138 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1139 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1140 in6_ifa_put(ifp);
1141 in6_dev_put(idev);
1142 ret = -1;
1143 goto out;
1144 }
1145
95c385b4
NH		 1146 addr_flags = IFA_F_TEMPORARY;
1147 /* set in addrconf_prefix_rcv() */
1148 if (ifp->flags & IFA_F_OPTIMISTIC)
1149 addr_flags |= IFA_F_OPTIMISTIC;
1150
4b08a8f1
HFS		 1151 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1152 ipv6_addr_scope(&addr), addr_flags,
1153 tmp_valid_lft, tmp_prefered_lft);
1154 if (IS_ERR(ift)) {
1da177e4
LT		 1155 in6_ifa_put(ifp);
1156 in6_dev_put(idev);
f3213831 1157 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1158 tmpaddr = &addr;
53bd6749 1159 write_lock_bh(&idev->lock);
1da177e4
LT		 1160 goto retry;
1161 }
1162
1163 spin_lock_bh(&ift->lock);
1164 ift->ifpub = ifp;
76f793e3 1165 ift->cstamp = now;
1da177e4
LT		 1166 ift->tstamp = tmp_tstamp;
1167 spin_unlock_bh(&ift->lock);
1168
cf22f9a2 1169 addrconf_dad_start(ift);
1da177e4
LT		 1170 in6_ifa_put(ift);
1171 in6_dev_put(idev);
1172out:
1173 return ret;
1174}
1da177e4
LT		 1175
1176/*
072047e4 1177 * Choose an appropriate source address (RFC3484)
1da177e4 1178 */
a9b05723
YH		 1179enum {
1180 IPV6_SADDR_RULE_INIT = 0,
1181 IPV6_SADDR_RULE_LOCAL,
1182 IPV6_SADDR_RULE_SCOPE,
1183 IPV6_SADDR_RULE_PREFERRED,
1184#ifdef CONFIG_IPV6_MIP6
1185 IPV6_SADDR_RULE_HOA,
1186#endif
1187 IPV6_SADDR_RULE_OIF,
1188 IPV6_SADDR_RULE_LABEL,
a9b05723 1189 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1190 IPV6_SADDR_RULE_ORCHID,
1191 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1192#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1193 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1194#endif
a9b05723
YH		 1195 IPV6_SADDR_RULE_MAX
1196};
1197
072047e4 1198struct ipv6_saddr_score {
a9b05723
YH		 1199 int rule;
1200 int addr_type;
1201 struct inet6_ifaddr *ifa;
1202 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1203 int scopedist;
1204 int matchlen;
072047e4
YH		 1205};
1206
a9b05723 1207struct ipv6_saddr_dst {
9acd9f3a 1208 const struct in6_addr *addr;
a9b05723
YH		 1209 int ifindex;
1210 int scope;
1211 int label;
7cbca67c 1212 unsigned int prefs;
a9b05723 1213};
072047e4 1214
b6f99a21 1215static inline int ipv6_saddr_preferred(int type)
1da177e4 1216{
45bb0060 1217 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1218 return 1;
1219 return 0;
1da177e4
LT		 1220}
1221
7fd2561e
EK		 1222static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1223{
1224#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1225 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1226#else
1227 return false;
1228#endif
1229}
1230
3de23255
BT		 1231static int ipv6_get_saddr_eval(struct net *net,
1232 struct ipv6_saddr_score *score,
a9b05723
YH		 1233 struct ipv6_saddr_dst *dst,
1234 int i)
1235{
1236 int ret;
1237
1238 if (i <= score->rule) {
1239 switch (i) {
1240 case IPV6_SADDR_RULE_SCOPE:
1241 ret = score->scopedist;
1242 break;
1243 case IPV6_SADDR_RULE_PREFIX:
1244 ret = score->matchlen;
1245 break;
1246 default:
1247 ret = !!test_bit(i, score->scorebits);
1248 }
1249 goto out;
1250 }
1251
1252 switch (i) {
1253 case IPV6_SADDR_RULE_INIT:
1254 /* Rule 0: remember if hiscore is not ready yet */
1255 ret = !!score->ifa;
1256 break;
1257 case IPV6_SADDR_RULE_LOCAL:
1258 /* Rule 1: Prefer same address */
1259 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1260 break;
1261 case IPV6_SADDR_RULE_SCOPE:
1262 /* Rule 2: Prefer appropriate scope
1263 *
1264 * ret
1265 * ^
1266 * -1 | d 15
1267 * ---+--+-+---> scope
1268 * |
1269 * | d is scope of the destination.
1270 * B-d | \
1271 * | \ <- smaller scope is better if
db9c7c39 1272 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1273 * | ret = B - scope (-1 <= scope >= d <= 15).
1274 * d-C-1 | /
1275 * |/ <- greater is better
1276 * -C / if scope is not enough for destination.
1277 * /| ret = scope - C (-1 <= d < scope <= 15).
1278 *
1279 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1280 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1281 * Assume B = 0 and we get C > 29.
1282 */
1283 ret = __ipv6_addr_src_scope(score->addr_type);
1284 if (ret >= dst->scope)
1285 ret = -ret;
1286 else
1287 ret -= 128; /* 30 is enough */
1288 score->scopedist = ret;
1289 break;
1290 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1291 {
a9b05723 1292 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1293 u8 avoid = IFA_F_DEPRECATED;
1294
1295 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1296 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1297 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1298 !(score->ifa->flags & avoid);
a9b05723 1299 break;
7fd2561e 1300 }
a9b05723
YH		 1301#ifdef CONFIG_IPV6_MIP6
1302 case IPV6_SADDR_RULE_HOA:
7cbca67c 1303 {
a9b05723 1304 /* Rule 4: Prefer home address */
7cbca67c
YH		 1305 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1306 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1307 break;
7cbca67c 1308 }
a9b05723
YH		 1309#endif
1310 case IPV6_SADDR_RULE_OIF:
1311 /* Rule 5: Prefer outgoing interface */
1312 ret = (!dst->ifindex ||
1313 dst->ifindex == score->ifa->idev->dev->ifindex);
1314 break;
1315 case IPV6_SADDR_RULE_LABEL:
1316 /* Rule 6: Prefer matching label */
3de23255
BT		 1317 ret = ipv6_addr_label(net,
1318 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1319 score->ifa->idev->dev->ifindex) == dst->label;
1320 break;
a9b05723 1321 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1322 {
a9b05723 1323 /* Rule 7: Prefer public address
25985edc 1324 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1325 */
7cbca67c
YH		 1326 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1327 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1328 score->ifa->idev->cnf.use_tempaddr >= 2;
1329 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1330 break;
7cbca67c 1331 }
a9b05723
YH		 1332 case IPV6_SADDR_RULE_ORCHID:
1333 /* Rule 8-: Prefer ORCHID vs ORCHID or
1334 * non-ORCHID vs non-ORCHID
1335 */
1336 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1337 ipv6_addr_orchid(dst->addr));
1338 break;
1339 case IPV6_SADDR_RULE_PREFIX:
1340 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1341 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1342 if (ret > score->ifa->prefix_len)
1343 ret = score->ifa->prefix_len;
1344 score->matchlen = ret;
a9b05723 1345 break;
7fd2561e
EK		 1346#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1347 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1348 /* Optimistic addresses still have lower precedence than other
1349 * preferred addresses.
1350 */
1351 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1352 break;
1353#endif
a9b05723
YH		 1354 default:
1355 ret = 0;
1356 }
1357
1358 if (ret)
1359 __set_bit(i, score->scorebits);
1360 score->rule = i;
1361out:
1362 return ret;
1363}
1364
c0b8da1e
YH		 1365static int __ipv6_dev_get_saddr(struct net *net,
1366 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1367 struct inet6_dev *idev,
1368 struct ipv6_saddr_score *scores,
1369 int hiscore_idx)
9131f3de 1370{
c0b8da1e 1371 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de
YH		 1372
1373 read_lock_bh(&idev->lock);
1374 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1375 int i;
1376
1377 /*
1378 * - Tentative Address (RFC2462 section 5.4)
1379 * - A tentative address is not considered
1380 * "assigned to an interface" in the traditional
1381 * sense, unless it is also flagged as optimistic.
1382 * - Candidate Source Address (section 4)
1383 * - In any case, anycast addresses, multicast
1384 * addresses, and the unspecified address MUST
1385 * NOT be included in a candidate set.
1386 */
1387 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1388 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1389 continue;
1390
1391 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1392
1393 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1394 score->addr_type & IPV6_ADDR_MULTICAST)) {
1395 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1396 idev->dev->name);
1397 continue;
1398 }
1399
1400 score->rule = -1;
1401 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1402
1403 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1404 int minihiscore, miniscore;
1405
1406 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1407 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1408
1409 if (minihiscore > miniscore) {
1410 if (i == IPV6_SADDR_RULE_SCOPE &&
1411 score->scopedist > 0) {
1412 /*
1413 * special case:
1414 * each remaining entry
1415 * has too small (not enough)
1416 * scope, because ifa entries
1417 * are sorted by their scope
1418 * values.
1419 */
1420 goto out;
1421 }
1422 break;
1423 } else if (minihiscore < miniscore) {
1424 if (hiscore->ifa)
1425 in6_ifa_put(hiscore->ifa);
1426
1427 in6_ifa_hold(score->ifa);
1428
1429 swap(hiscore, score);
c0b8da1e 1430 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1431
1432 /* restore our iterator */
1433 score->ifa = hiscore->ifa;
1434
1435 break;
1436 }
1437 }
1438 }
1439out:
1440 read_unlock_bh(&idev->lock);
c0b8da1e 1441 return hiscore_idx;
9131f3de
YH		 1442}
1443
b3f644fc 1444int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1445 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1446 struct in6_addr *saddr)
1da177e4 1447{
c0b8da1e 1448 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1449 struct ipv6_saddr_dst dst;
9131f3de 1450 struct inet6_dev *idev;
072047e4 1451 struct net_device *dev;
a9b05723 1452 int dst_type;
9131f3de 1453 bool use_oif_addr = false;
c0b8da1e 1454 int hiscore_idx = 0;
1da177e4 1455
a9b05723
YH		 1456 dst_type = __ipv6_addr_type(daddr);
1457 dst.addr = daddr;
1458 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1459 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1460 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1461 dst.prefs = prefs;
a9b05723 1462
c0b8da1e
YH		 1463 scores[hiscore_idx].rule = -1;
1464 scores[hiscore_idx].ifa = NULL;
1da177e4 1465
8814c4b5 1466 rcu_read_lock();
1da177e4 1467
9131f3de
YH		 1468 /* Candidate Source Address (section 4)
1469 * - multicast and link-local destination address,
1470 * the set of candidate source address MUST only
1471 * include addresses assigned to interfaces
1472 * belonging to the same link as the outgoing
1473 * interface.
1474 * (- For site-local destination addresses, the
1475 * set of candidate source addresses MUST only
1476 * include addresses assigned to interfaces
1477 * belonging to the same site as the outgoing
1478 * interface.)
3985e8a3
EK		 1479 * - "It is RECOMMENDED that the candidate source addresses
1480 * be the set of unicast addresses assigned to the
1481 * interface that will be used to send to the destination
1482 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1483 */
1484 if (dst_dev) {
3985e8a3 1485 idev = __in6_dev_get(dst_dev);
9131f3de 1486 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1487 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1488 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1489 use_oif_addr = true;
1490 }
1491 }
a9b05723 1492
9131f3de 1493 if (use_oif_addr) {
c0b8da1e 1494 if (idev)
c15df306 1495 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de
YH		 1496 } else {
1497 for_each_netdev_rcu(net, dev) {
1498 idev = __in6_dev_get(dev);
1499 if (!idev)
072047e4 1500 continue;
c15df306 1501 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1502 }
1503 }
8814c4b5 1504 rcu_read_unlock();
1da177e4 1505
c0b8da1e 1506 hiscore = &scores[hiscore_idx];
a9b05723 1507 if (!hiscore->ifa)
072047e4 1508 return -EADDRNOTAVAIL;
1ab1457c 1509
4e3fd7a0 1510 *saddr = hiscore->ifa->addr;
a9b05723 1511 in6_ifa_put(hiscore->ifa);
072047e4 1512 return 0;
1da177e4 1513}
5e5f3f0f 1514EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1515
8965779d 1516int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1517 u32 banned_flags)
b7b1bfce
HFS		 1518{
1519 struct inet6_ifaddr *ifp;
1520 int err = -EADDRNOTAVAIL;
1521
602582ca
HFS		 1522 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1523 if (ifp->scope > IFA_LINK)
1524 break;
b7b1bfce
HFS		 1525 if (ifp->scope == IFA_LINK &&
1526 !(ifp->flags & banned_flags)) {
1527 *addr = ifp->addr;
1528 err = 0;
1529 break;
1530 }
1531 }
1532 return err;
1533}
1534
95c385b4 1535int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1536 u32 banned_flags)
1da177e4
LT		 1537{
1538 struct inet6_dev *idev;
1539 int err = -EADDRNOTAVAIL;
1540
8814c4b5 1541 rcu_read_lock();
e21e8467
SH		 1542 idev = __in6_dev_get(dev);
1543 if (idev) {
1da177e4 1544 read_lock_bh(&idev->lock);
b7b1bfce 1545 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1546 read_unlock_bh(&idev->lock);
1547 }
8814c4b5 1548 rcu_read_unlock();
1da177e4
LT		 1549 return err;
1550}
1551
1552static int ipv6_count_addresses(struct inet6_dev *idev)
1553{
1554 int cnt = 0;
1555 struct inet6_ifaddr *ifp;
1556
1557 read_lock_bh(&idev->lock);
502a2ffd 1558 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1559 cnt++;
1560 read_unlock_bh(&idev->lock);
1561 return cnt;
1562}
1563
b71d1d42 1564int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1565 const struct net_device *dev, int strict)
c58da4c6
EK		 1566{
1567 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1568}
1569EXPORT_SYMBOL(ipv6_chk_addr);
1570
1571int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1572 const struct net_device *dev, int strict,
1573 u32 banned_flags)
1da177e4 1574{
eedf042a 1575 struct inet6_ifaddr *ifp;
ddbe5032 1576 unsigned int hash = inet6_addr_hash(addr);
c58da4c6 1577 u32 ifp_flags;
1da177e4 1578
5c578aed 1579 rcu_read_lock_bh();
b67bfe0d 1580 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1581 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1582 continue;
c58da4c6
EK		 1583 /* Decouple optimistic from tentative for evaluation here.
1584 * Ban optimistic addresses explicitly, when required.
1585 */
1586 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1587 ? (ifp->flags&~IFA_F_TENTATIVE)
1588 : ifp->flags;
1da177e4 1589 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1590 !(ifp_flags&banned_flags) &&
63159f29 1591 (!dev || ifp->idev->dev == dev ||
eedf042a
SH		 1592 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1593 rcu_read_unlock_bh();
1594 return 1;
1da177e4
LT		 1595 }
1596 }
5c578aed 1597
eedf042a
SH		 1598 rcu_read_unlock_bh();
1599 return 0;
1da177e4 1600}
c58da4c6 1601EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1602
3e81c6da
DM		 1603static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1604 struct net_device *dev)
1da177e4 1605{
ddbe5032 1606 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1607 struct inet6_ifaddr *ifp;
1da177e4 1608
b67bfe0d 1609 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1610 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1611 continue;
1da177e4 1612 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1613 if (!dev || ifp->idev->dev == dev)
3e81c6da 1614 return true;
1da177e4
LT		 1615 }
1616 }
3e81c6da 1617 return false;
1da177e4
LT		 1618}
1619
7df37ff3
CB		 1620/* Compares an address/prefix_len with addresses on device @dev.
1621 * If one is found it returns true.
1622 */
1623bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1624 const unsigned int prefix_len, struct net_device *dev)
1625{
1626 struct inet6_dev *idev;
1627 struct inet6_ifaddr *ifa;
1628 bool ret = false;
1629
1630 rcu_read_lock();
1631 idev = __in6_dev_get(dev);
1632 if (idev) {
1633 read_lock_bh(&idev->lock);
1634 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1635 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1636 if (ret)
1637 break;
1638 }
1639 read_unlock_bh(&idev->lock);
1640 }
1641 rcu_read_unlock();
1642
1643 return ret;
1644}
1645EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1646
b71d1d42 1647int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1648{
1649 struct inet6_dev *idev;
1650 struct inet6_ifaddr *ifa;
1651 int onlink;
1652
1653 onlink = 0;
1654 rcu_read_lock();
1655 idev = __in6_dev_get(dev);
1656 if (idev) {
1657 read_lock_bh(&idev->lock);
502a2ffd 1658 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1659 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1660 ifa->prefix_len);
1661 if (onlink)
1662 break;
1663 }
1664 read_unlock_bh(&idev->lock);
1665 }
1666 rcu_read_unlock();
1667 return onlink;
1668}
52eeeb84
YH		 1669EXPORT_SYMBOL(ipv6_chk_prefix);
1670
9acd9f3a 1671struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1672 struct net_device *dev, int strict)
1da177e4 1673{
b79d1d54 1674 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1675 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1676
5c578aed 1677 rcu_read_lock_bh();
b67bfe0d 1678 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1679 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1680 continue;
1da177e4 1681 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1682 if (!dev || ifp->idev->dev == dev ||
1da177e4 1683 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1684 result = ifp;
1da177e4
LT		 1685 in6_ifa_hold(ifp);
1686 break;
1687 }
1688 }
1689 }
5c578aed 1690 rcu_read_unlock_bh();
1da177e4 1691
b79d1d54 1692 return result;
1da177e4
LT		 1693}
1694
1da177e4
LT		 1695/* Gets referenced address, destroys ifaddr */
1696
cc411d0b 1697static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1698{
1da177e4
LT		 1699 if (ifp->flags&IFA_F_PERMANENT) {
1700 spin_lock_bh(&ifp->lock);
c15b1cca 1701 addrconf_del_dad_work(ifp);
1da177e4 1702 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1703 if (dad_failed)
1704 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1705 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1706 if (dad_failed)
1707 ipv6_ifa_notify(0, ifp);
1da177e4 1708 in6_ifa_put(ifp);
1da177e4
LT		 1709 } else if (ifp->flags&IFA_F_TEMPORARY) {
1710 struct inet6_ifaddr *ifpub;
1711 spin_lock_bh(&ifp->lock);
1712 ifpub = ifp->ifpub;
1713 if (ifpub) {
1714 in6_ifa_hold(ifpub);
1715 spin_unlock_bh(&ifp->lock);
1716 ipv6_create_tempaddr(ifpub, ifp);
1717 in6_ifa_put(ifpub);
1718 } else {
1719 spin_unlock_bh(&ifp->lock);
1720 }
1721 ipv6_del_addr(ifp);
c15b1cca 1722 } else {
1da177e4 1723 ipv6_del_addr(ifp);
c15b1cca 1724 }
1da177e4
LT		 1725}
1726
f2344a13
HX		 1727static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1728{
1729 int err = -ENOENT;
1730
8e8e676d 1731 spin_lock_bh(&ifp->lock);
f2344a13
HX		 1732 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1733 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1734 err = 0;
1735 }
8e8e676d 1736 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 1737
1738 return err;
1739}
1740
3c21edbd
YH		 1741void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1742{
5f40ef77 1743 struct in6_addr addr;
1b34be74 1744 struct inet6_dev *idev = ifp->idev;
1855b7c3 1745 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 1746
853dc2e0
UB		 1747 if (addrconf_dad_end(ifp)) {
1748 in6_ifa_put(ifp);
f2344a13 1749 return;
853dc2e0 1750 }
f2344a13 1751
e87cc472
JP		 1752 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1753 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1754
5f40ef77
HFS		 1755 spin_lock_bh(&ifp->lock);
1756
1757 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1758 int scope = ifp->scope;
1759 u32 flags = ifp->flags;
1760 struct in6_addr new_addr;
1761 struct inet6_ifaddr *ifp2;
1762 u32 valid_lft, preferred_lft;
1763 int pfxlen = ifp->prefix_len;
5f40ef77
HFS		 1764 int retries = ifp->stable_privacy_retry + 1;
1765
1855b7c3 1766 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 1767 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1768 ifp->idev->dev->name);
1769 goto errdad;
1770 }
1771
1772 new_addr = ifp->addr;
1773 if (ipv6_generate_stable_address(&new_addr, retries,
1774 idev))
1775 goto errdad;
1776
1777 valid_lft = ifp->valid_lft;
1778 preferred_lft = ifp->prefered_lft;
1779
1780 spin_unlock_bh(&ifp->lock);
1b34be74 1781
5f40ef77
HFS		 1782 if (idev->cnf.max_addresses &&
1783 ipv6_count_addresses(idev) >=
1784 idev->cnf.max_addresses)
1785 goto lock_errdad;
1786
1787 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1788 ifp->idev->dev->name);
1789
1790 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1791 scope, flags, valid_lft,
1792 preferred_lft);
1793 if (IS_ERR(ifp2))
1794 goto lock_errdad;
1795
1796 spin_lock_bh(&ifp2->lock);
1797 ifp2->stable_privacy_retry = retries;
1798 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1799 spin_unlock_bh(&ifp2->lock);
1800
1855b7c3 1801 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 1802 in6_ifa_put(ifp2);
1803lock_errdad:
1804 spin_lock_bh(&ifp->lock);
1805 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1b34be74
YH		 1806 addr.s6_addr32[0] = htonl(0xfe800000);
1807 addr.s6_addr32[1] = 0;
1808
1809 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1810 ipv6_addr_equal(&ifp->addr, &addr)) {
1811 /* DAD failed for link-local based on MAC address */
1812 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1813
f3213831 1814 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1815 ifp->idev->dev->name);
1b34be74
YH		 1816 }
1817 }
1818
5f40ef77 1819errdad:
c15b1cca
HFS		 1820 /* transition from _POSTDAD to _ERRDAD */
1821 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 1822 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 1823
1824 addrconf_mod_dad_work(ifp, 0);
3c21edbd 1825}
1da177e4 1826
a9ed4a29
SD		 1827/* Join to solicited addr multicast group.
1828 * caller must hold RTNL */
b71d1d42 1829void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1830{
1831 struct in6_addr maddr;
1832
1833 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1834 return;
1835
1836 addrconf_addr_solict_mult(addr, &maddr);
1837 ipv6_dev_mc_inc(dev, &maddr);
1838}
1839
a9ed4a29 1840/* caller must hold RTNL */
b71d1d42 1841void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1842{
1843 struct in6_addr maddr;
1844
1845 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1846 return;
1847
1848 addrconf_addr_solict_mult(addr, &maddr);
1849 __ipv6_dev_mc_dec(idev, &maddr);
1850}
1851
a9ed4a29 1852/* caller must hold RTNL */
20380731 1853static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1854{
1855 struct in6_addr addr;
c15b1cca 1856
88ad3149 1857 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 1858 return;
1da177e4
LT		 1859 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1860 if (ipv6_addr_any(&addr))
1861 return;
013b4d90 1862 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 1863}
1864
a9ed4a29 1865/* caller must hold RTNL */
20380731 1866static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1867{
1868 struct in6_addr addr;
c15b1cca 1869
88ad3149 1870 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 1871 return;
1da177e4
LT		 1872 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1873 if (ipv6_addr_any(&addr))
1874 return;
1875 __ipv6_dev_ac_dec(ifp->idev, &addr);
1876}
1877
073a8e0e
YH		 1878static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1879{
1880 if (dev->addr_len != ETH_ALEN)
1881 return -1;
1882 memcpy(eui, dev->dev_addr, 3);
1883 memcpy(eui + 5, dev->dev_addr + 3, 3);
1884
1885 /*
1886 * The zSeries OSA network cards can be shared among various
1887 * OS instances, but the OSA cards have only one MAC address.
1888 * This leads to duplicate address conflicts in conjunction
1889 * with IPv6 if more than one instance uses the same card.
1890 *
1891 * The driver for these cards can deliver a unique 16-bit
1892 * identifier for each instance sharing the same card. It is
1893 * placed instead of 0xFFFE in the interface identifier. The
1894 * "u" bit of the interface identifier is not inverted in this
1895 * case. Hence the resulting interface identifier has local
1896 * scope according to RFC2373.
1897 */
1898 if (dev->dev_id) {
1899 eui[3] = (dev->dev_id >> 8) & 0xFF;
1900 eui[4] = dev->dev_id & 0xFF;
1901 } else {
1902 eui[3] = 0xFF;
1903 eui[4] = 0xFE;
1904 eui[0] ^= 2;
1905 }
1906 return 0;
1907}
1908
06a4c1c5 1909static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1910{
1911 if (dev->addr_len != IEEE802154_ADDR_LEN)
1912 return -1;
1913 memcpy(eui, dev->dev_addr, 8);
5e98a36e 1914 eui[0] ^= 2;
06a4c1c5 1915 return 0;
1916}
1917
cb6bf355
YH		 1918static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1919{
1920 union fwnet_hwaddr *ha;
1921
1922 if (dev->addr_len != FWNET_ALEN)
1923 return -1;
1924
1925 ha = (union fwnet_hwaddr *)dev->dev_addr;
1926
1927 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1928 eui[0] ^= 2;
1929 return 0;
1930}
1931
073a8e0e
YH		 1932static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1933{
1934 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1935 if (dev->addr_len != ARCNET_ALEN)
1936 return -1;
1937 memset(eui, 0, 7);
8e5e8f30 1938 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1939 return 0;
1940}
1941
1942static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1943{
1944 if (dev->addr_len != INFINIBAND_ALEN)
1945 return -1;
1946 memcpy(eui, dev->dev_addr + 12, 8);
1947 eui[0] |= 2;
1948 return 0;
1949}
1950
c61393ea 1951static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1952{
9af28511
SH		 1953 if (addr == 0)
1954 return -1;
dfd982ba
YH		 1955 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1956 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1957 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1958 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1959 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1960 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1961 eui[1] = 0;
1962 eui[2] = 0x5E;
1963 eui[3] = 0xFE;
1964 memcpy(eui + 4, &addr, 4);
1965 return 0;
1966}
dfd982ba
YH		 1967
1968static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1969{
1970 if (dev->priv_flags & IFF_ISATAP)
1971 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1972 return -1;
1973}
1974
aee80b54 1975static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1976{
1977 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1978}
1979
e837735e
ND		 1980static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1981{
1982 memcpy(eui, dev->perm_addr, 3);
1983 memcpy(eui + 5, dev->perm_addr + 3, 3);
1984 eui[3] = 0xFF;
1985 eui[4] = 0xFE;
1986 eui[0] ^= 2;
1987 return 0;
1988}
1989
1da177e4
LT		 1990static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1991{
1992 switch (dev->type) {
1993 case ARPHRD_ETHER:
1994 case ARPHRD_FDDI:
073a8e0e 1995 return addrconf_ifid_eui48(eui, dev);
1da177e4 1996 case ARPHRD_ARCNET:
073a8e0e 1997 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1998 case ARPHRD_INFINIBAND:
073a8e0e 1999 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2000 case ARPHRD_SIT:
dfd982ba 2001 return addrconf_ifid_sit(eui, dev);
aee80b54 2002 case ARPHRD_IPGRE:
2003 return addrconf_ifid_gre(eui, dev);
e74bccb8 2004 case ARPHRD_6LOWPAN:
06a4c1c5 2005 case ARPHRD_IEEE802154:
2006 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 2007 case ARPHRD_IEEE1394:
2008 return addrconf_ifid_ieee1394(eui, dev);
e837735e
ND		 2009 case ARPHRD_TUNNEL6:
2010 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2011 }
2012 return -1;
2013}
2014
2015static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2016{
2017 int err = -1;
2018 struct inet6_ifaddr *ifp;
2019
2020 read_lock_bh(&idev->lock);
602582ca
HFS		 2021 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2022 if (ifp->scope > IFA_LINK)
2023 break;
1da177e4
LT		 2024 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2025 memcpy(eui, ifp->addr.s6_addr+8, 8);
2026 err = 0;
2027 break;
2028 }
2029 }
2030 read_unlock_bh(&idev->lock);
2031 return err;
2032}
2033
1da177e4 2034/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 2035static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2036{
1da177e4 2037regen:
955189ef 2038 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2039 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2040
2041 /*
2042 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2043 * check if generated address is not inappropriate
2044 *
2045 * - Reserved subnet anycast (RFC 2526)
2046 * 11111101 11....11 1xxxxxxx
c7dc89c0 2047 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2048 * 00-00-5E-FE-xx-xx-xx-xx
2049 * - value 0
2050 * - XXX: already assigned to an address on the device
2051 */
1ab1457c 2052 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2053 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2054 (idev->rndid[7]&0x80))
2055 goto regen;
2056 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2057 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2058 goto regen;
2059 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2060 goto regen;
2061 }
1da177e4
LT		 2062}
2063
2064static void ipv6_regen_rndid(unsigned long data)
2065{
2066 struct inet6_dev *idev = (struct inet6_dev *) data;
2067 unsigned long expires;
2068
8814c4b5 2069 rcu_read_lock_bh();
1da177e4
LT		 2070 write_lock_bh(&idev->lock);
2071
2072 if (idev->dead)
2073 goto out;
2074
eb7e0575 2075 __ipv6_regen_rndid(idev);
1ab1457c 2076
1da177e4 2077 expires = jiffies +
1ab1457c 2078 idev->cnf.temp_prefered_lft * HZ -
1f9248e5
JP		 2079 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2080 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
784e2710 2081 idev->cnf.max_desync_factor * HZ;
1da177e4 2082 if (time_before(expires, jiffies)) {
f3213831
JP		 2083 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2084 __func__, idev->dev->name);
1da177e4
LT		 2085 goto out;
2086 }
2087
2088 if (!mod_timer(&idev->regen_timer, expires))
2089 in6_dev_hold(idev);
2090
2091out:
2092 write_unlock_bh(&idev->lock);
8814c4b5 2093 rcu_read_unlock_bh();
1da177e4
LT		 2094 in6_dev_put(idev);
2095}
2096
eb7e0575 2097static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2098{
1da177e4 2099 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 2100 __ipv6_regen_rndid(idev);
1da177e4 2101}
1da177e4
LT		 2102
2103/*
2104 * Add prefix route.
2105 */
2106
2107static void
2108addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2109 unsigned long expires, u32 flags)
1da177e4 2110{
86872cb5
TG		 2111 struct fib6_config cfg = {
2112 .fc_table = RT6_TABLE_PREFIX,
2113 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2114 .fc_ifindex = dev->ifindex,
2115 .fc_expires = expires,
2116 .fc_dst_len = plen,
2117 .fc_flags = RTF_UP | flags,
c346dca1 2118 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2119 .fc_protocol = RTPROT_KERNEL,
86872cb5 2120 };
1da177e4 2121
4e3fd7a0 2122 cfg.fc_dst = *pfx;
1da177e4
LT		 2123
2124 /* Prevent useless cloning on PtP SIT.
2125 This thing is done here expecting that the whole
2126 class of non-broadcast devices need not cloning.
2127 */
07a93626 2128#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2129 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2130 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2131#endif
1da177e4 2132
86872cb5 2133 ip6_route_add(&cfg);
1da177e4
LT		 2134}
2135
14ef37b6
AH		 2136
2137static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2138 int plen,
2139 const struct net_device *dev,
2140 u32 flags, u32 noflags)
2141{
2142 struct fib6_node *fn;
2143 struct rt6_info *rt = NULL;
2144 struct fib6_table *table;
2145
2146 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
63159f29 2147 if (!table)
14ef37b6
AH		 2148 return NULL;
2149
5744dd9b 2150 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2151 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2152 if (!fn)
2153 goto out;
1f56a01f
MKL		 2154
2155 noflags |= RTF_CACHE;
14ef37b6 2156 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2157 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2158 continue;
2159 if ((rt->rt6i_flags & flags) != flags)
2160 continue;
85da53bf 2161 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2162 continue;
2163 dst_hold(&rt->dst);
2164 break;
2165 }
2166out:
5744dd9b 2167 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2168 return rt;
2169}
2170
2171
1da177e4
LT		 2172/* Create "default" multicast route to the interface */
2173
2174static void addrconf_add_mroute(struct net_device *dev)
2175{
86872cb5
TG		 2176 struct fib6_config cfg = {
2177 .fc_table = RT6_TABLE_LOCAL,
2178 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2179 .fc_ifindex = dev->ifindex,
2180 .fc_dst_len = 8,
2181 .fc_flags = RTF_UP,
c346dca1 2182 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2183 };
2184
2185 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2186
2187 ip6_route_add(&cfg);
1da177e4
LT		 2188}
2189
1da177e4
LT		 2190static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2191{
2192 struct inet6_dev *idev;
2193
2194 ASSERT_RTNL();
2195
e21e8467
SH		 2196 idev = ipv6_find_idev(dev);
2197 if (!idev)
64e724f6
BH		 2198 return ERR_PTR(-ENOBUFS);
2199
2200 if (idev->cnf.disable_ipv6)
2201 return ERR_PTR(-EACCES);
1da177e4
LT		 2202
2203 /* Add default multicast route */
4af04aba
LW		 2204 if (!(dev->flags & IFF_LOOPBACK))
2205 addrconf_add_mroute(dev);
1da177e4 2206
1da177e4
LT		 2207 return idev;
2208}
2209
53bd6749
JP		 2210static void manage_tempaddrs(struct inet6_dev *idev,
2211 struct inet6_ifaddr *ifp,
2212 __u32 valid_lft, __u32 prefered_lft,
2213 bool create, unsigned long now)
2214{
2215 u32 flags;
2216 struct inet6_ifaddr *ift;
2217
2218 read_lock_bh(&idev->lock);
2219 /* update all temporary addresses in the list */
2220 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2221 int age, max_valid, max_prefered;
2222
2223 if (ifp != ift->ifpub)
2224 continue;
2225
2226 /* RFC 4941 section 3.3:
2227 * If a received option will extend the lifetime of a public
2228 * address, the lifetimes of temporary addresses should
2229 * be extended, subject to the overall constraint that no
2230 * temporary addresses should ever remain "valid" or "preferred"
2231 * for a time longer than (TEMP_VALID_LIFETIME) or
2232 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2233 */
2234 age = (now - ift->cstamp) / HZ;
2235 max_valid = idev->cnf.temp_valid_lft - age;
2236 if (max_valid < 0)
2237 max_valid = 0;
2238
2239 max_prefered = idev->cnf.temp_prefered_lft -
2240 idev->cnf.max_desync_factor - age;
2241 if (max_prefered < 0)
2242 max_prefered = 0;
2243
2244 if (valid_lft > max_valid)
2245 valid_lft = max_valid;
2246
2247 if (prefered_lft > max_prefered)
2248 prefered_lft = max_prefered;
2249
2250 spin_lock(&ift->lock);
2251 flags = ift->flags;
2252 ift->valid_lft = valid_lft;
2253 ift->prefered_lft = prefered_lft;
2254 ift->tstamp = now;
2255 if (prefered_lft > 0)
2256 ift->flags &= ~IFA_F_DEPRECATED;
2257
2258 spin_unlock(&ift->lock);
2259 if (!(flags&IFA_F_TENTATIVE))
2260 ipv6_ifa_notify(0, ift);
2261 }
2262
2263 if ((create || list_empty(&idev->tempaddr_list)) &&
2264 idev->cnf.use_tempaddr > 0) {
2265 /* When a new public address is created as described
2266 * in [ADDRCONF], also create a new temporary address.
2267 * Also create a temporary address if it's enabled but
2268 * no temporary address currently exists.
2269 */
2270 read_unlock_bh(&idev->lock);
2271 ipv6_create_tempaddr(ifp, NULL);
2272 } else {
2273 read_unlock_bh(&idev->lock);
2274 }
2275}
2276
e6bff995 2277void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2278{
2279 struct prefix_info *pinfo;
2280 __u32 valid_lft;
2281 __u32 prefered_lft;
2282 int addr_type;
64236f3f 2283 u32 addr_flags = 0;
1da177e4 2284 struct inet6_dev *in6_dev;
56d417b1 2285 struct net *net = dev_net(dev);
1da177e4
LT		 2286
2287 pinfo = (struct prefix_info *) opt;
1ab1457c 2288
1da177e4 2289 if (len < sizeof(struct prefix_info)) {
ba3542e1 2290 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2291 return;
2292 }
1ab1457c 2293
1da177e4
LT		 2294 /*
2295 * Validation checks ([ADDRCONF], page 19)
2296 */
2297
2298 addr_type = ipv6_addr_type(&pinfo->prefix);
2299
2300 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2301 return;
2302
2303 valid_lft = ntohl(pinfo->valid);
2304 prefered_lft = ntohl(pinfo->prefered);
2305
2306 if (prefered_lft > valid_lft) {
e87cc472 2307 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2308 return;
2309 }
2310
2311 in6_dev = in6_dev_get(dev);
2312
63159f29 2313 if (!in6_dev) {
e87cc472
JP		 2314 net_dbg_ratelimited("addrconf: device %s not configured\n",
2315 dev->name);
1da177e4
LT		 2316 return;
2317 }
2318
2319 /*
2320 * Two things going on here:
2321 * 1) Add routes for on-link prefixes
2322 * 2) Configure prefixes with the auto flag set
2323 */
2324
4bed72e4
YH		 2325 if (pinfo->onlink) {
2326 struct rt6_info *rt;
2327 unsigned long rt_expires;
2328
6f704992
YH		 2329 /* Avoid arithmetic overflow. Really, we could
2330 * save rt_expires in seconds, likely valid_lft,
2331 * but it would require division in fib gc, that it
2332 * not good.
2333 */
4bed72e4
YH		 2334 if (HZ > USER_HZ)
2335 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2336 else
2337 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2338
4bed72e4
YH		 2339 if (addrconf_finite_timeout(rt_expires))
2340 rt_expires *= HZ;
1da177e4 2341
14ef37b6
AH		 2342 rt = addrconf_get_prefix_route(&pinfo->prefix,
2343 pinfo->prefix_len,
2344 dev,
2345 RTF_ADDRCONF | RTF_PREFIX_RT,
2346 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2347
14ef37b6 2348 if (rt) {
6f704992
YH		 2349 /* Autoconf prefix route */
2350 if (valid_lft == 0) {
2351 ip6_del_rt(rt);
2352 rt = NULL;
4bed72e4 2353 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2354 /* not infinity */
1716a961 2355 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2356 } else {
1716a961 2357 rt6_clean_expires(rt);
1da177e4
LT		 2358 }
2359 } else if (valid_lft) {
6f704992 2360 clock_t expires = 0;
4bed72e4
YH		 2361 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2362 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2363 /* not infinity */
2364 flags |= RTF_EXPIRES;
2365 expires = jiffies_to_clock_t(rt_expires);
2366 }
1da177e4 2367 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2368 dev, expires, flags);
1da177e4 2369 }
94e187c0 2370 ip6_rt_put(rt);
1da177e4
LT		 2371 }
2372
2373 /* Try to figure out our local address for this prefix */
2374
2375 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2376 struct inet6_ifaddr *ifp;
1da177e4
LT		 2377 struct in6_addr addr;
2378 int create = 0, update_lft = 0;
617fe29d 2379 bool tokenized = false;
1da177e4
LT		 2380
2381 if (pinfo->prefix_len == 64) {
2382 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2383
2384 if (!ipv6_addr_any(&in6_dev->token)) {
2385 read_lock_bh(&in6_dev->lock);
2386 memcpy(addr.s6_addr + 8,
2387 in6_dev->token.s6_addr + 8, 8);
2388 read_unlock_bh(&in6_dev->lock);
617fe29d 2389 tokenized = true;
622c81d5
HFS		 2390 } else if (in6_dev->addr_gen_mode ==
2391 IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
2392 !ipv6_generate_stable_address(&addr, 0,
2393 in6_dev)) {
64236f3f 2394 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2395 goto ok;
f53adae4
DB		 2396 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2397 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1da177e4
LT		 2398 in6_dev_put(in6_dev);
2399 return;
2400 }
2401 goto ok;
2402 }
e87cc472
JP		 2403 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2404 pinfo->prefix_len);
1da177e4
LT		 2405 in6_dev_put(in6_dev);
2406 return;
2407
2408ok:
2409
53b7997f 2410 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4 2411
63159f29 2412 if (!ifp && valid_lft) {
1da177e4 2413 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2414
2415#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2416 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2417 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 2418 addr_flags = IFA_F_OPTIMISTIC;
2419#endif
1da177e4
LT		 2420
2421 /* Do not allow to create too much of autoconfigured
2422 * addresses; this would be too easy way to crash kernel.
2423 */
2424 if (!max_addresses ||
2425 ipv6_count_addresses(in6_dev) < max_addresses)
3f8f5298
JP		 2426 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2427 pinfo->prefix_len,
95c385b4 2428 addr_type&IPV6_ADDR_SCOPE_MASK,
8a226b2c
JB		 2429 addr_flags, valid_lft,
2430 prefered_lft);
1da177e4 2431
3f0d2ba0 2432 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2433 in6_dev_put(in6_dev);
2434 return;
2435 }
2436
8a226b2c
JB		 2437 update_lft = 0;
2438 create = 1;
c15b1cca
HFS		 2439 spin_lock_bh(&ifp->lock);
2440 ifp->flags |= IFA_F_MANAGETEMPADDR;
1da177e4 2441 ifp->cstamp = jiffies;
617fe29d 2442 ifp->tokenized = tokenized;
c15b1cca 2443 spin_unlock_bh(&ifp->lock);
cf22f9a2 2444 addrconf_dad_start(ifp);
1da177e4
LT		 2445 }
2446
2447 if (ifp) {
479840ff 2448 u32 flags;
1da177e4 2449 unsigned long now;
1da177e4
LT		 2450 u32 stored_lft;
2451
2452 /* update lifetime (RFC2462 5.5.3 e) */
8e8e676d 2453 spin_lock_bh(&ifp->lock);
1da177e4
LT		 2454 now = jiffies;
2455 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2456 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2457 else
2458 stored_lft = 0;
8a226b2c 2459 if (!update_lft && !create && stored_lft) {
9451a304
FF		 2460 const u32 minimum_lft = min_t(u32,
2461 stored_lft, MIN_VALID_LIFETIME);
c9d55d5b
PM		 2462 valid_lft = max(valid_lft, minimum_lft);
2463
2464 /* RFC4862 Section 5.5.3e:
2465 * "Note that the preferred lifetime of the
2466 * corresponding address is always reset to
2467 * the Preferred Lifetime in the received
2468 * Prefix Information option, regardless of
2469 * whether the valid lifetime is also reset or
2470 * ignored."
2471 *
2472 * So we should always update prefered_lft here.
2473 */
2474 update_lft = 1;
1da177e4
LT		 2475 }
2476
2477 if (update_lft) {
2478 ifp->valid_lft = valid_lft;
2479 ifp->prefered_lft = prefered_lft;
2480 ifp->tstamp = now;
2481 flags = ifp->flags;
2482 ifp->flags &= ~IFA_F_DEPRECATED;
8e8e676d 2483 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2484
2485 if (!(flags&IFA_F_TENTATIVE))
2486 ipv6_ifa_notify(0, ifp);
2487 } else
8e8e676d 2488 spin_unlock_bh(&ifp->lock);
1da177e4 2489
53bd6749
JP		 2490 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2491 create, now);
5d9efa7e 2492
1da177e4 2493 in6_ifa_put(ifp);
c15b1cca 2494 addrconf_verify();
1da177e4
LT		 2495 }
2496 }
2497 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2498 in6_dev_put(in6_dev);
2499}
2500
2501/*
2502 * Set destination address.
2503 * Special case for SIT interfaces where we create a new "virtual"
2504 * device.
2505 */
af284937 2506int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2507{
2508 struct in6_ifreq ireq;
2509 struct net_device *dev;
2510 int err = -EINVAL;
2511
2512 rtnl_lock();
2513
2514 err = -EFAULT;
2515 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2516 goto err_exit;
2517
af284937 2518 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2519
2520 err = -ENODEV;
63159f29 2521 if (!dev)
1da177e4
LT		 2522 goto err_exit;
2523
07a93626 2524#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2525 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2526 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2527 struct ifreq ifr;
1da177e4
LT		 2528 struct ip_tunnel_parm p;
2529
2530 err = -EADDRNOTAVAIL;
2531 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2532 goto err_exit;
2533
2534 memset(&p, 0, sizeof(p));
2535 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2536 p.iph.saddr = 0;
2537 p.iph.version = 4;
2538 p.iph.ihl = 5;
2539 p.iph.protocol = IPPROTO_IPV6;
2540 p.iph.ttl = 64;
d20b3109 2541 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2542
5bc3eb7e
SH		 2543 if (ops->ndo_do_ioctl) {
2544 mm_segment_t oldfs = get_fs();
2545
2546 set_fs(KERNEL_DS);
2547 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2548 set_fs(oldfs);
2549 } else
2550 err = -EOPNOTSUPP;
1da177e4
LT		 2551
2552 if (err == 0) {
2553 err = -ENOBUFS;
af284937
DL		 2554 dev = __dev_get_by_name(net, p.name);
2555 if (!dev)
1da177e4
LT		 2556 goto err_exit;
2557 err = dev_open(dev);
2558 }
2559 }
0be669bb 2560#endif
1da177e4
LT		 2561
2562err_exit:
2563 rtnl_unlock();
2564 return err;
2565}
2566
93a714d6
MC		 2567static int ipv6_mc_config(struct sock *sk, bool join,
2568 const struct in6_addr *addr, int ifindex)
2569{
2570 int ret;
2571
2572 ASSERT_RTNL();
2573
2574 lock_sock(sk);
2575 if (join)
54ff9ef3 2576 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2577 else
54ff9ef3 2578 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2579 release_sock(sk);
2580
2581 return ret;
2582}
2583
1da177e4
LT		 2584/*
2585 * Manual configuration of address on an interface
2586 */
479840ff
JP		 2587static int inet6_addr_add(struct net *net, int ifindex,
2588 const struct in6_addr *pfx,
caeaba79 2589 const struct in6_addr *peer_pfx,
479840ff
JP		 2590 unsigned int plen, __u32 ifa_flags,
2591 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2592{
2593 struct inet6_ifaddr *ifp;
2594 struct inet6_dev *idev;
2595 struct net_device *dev;
93a714d6
MC		 2596 unsigned long timeout;
2597 clock_t expires;
1da177e4 2598 int scope;
6f704992 2599 u32 flags;
1da177e4
LT		 2600
2601 ASSERT_RTNL();
1ab1457c 2602
24ef0da7
TG		 2603 if (plen > 128)
2604 return -EINVAL;
2605
0778769d
NT		 2606 /* check the lifetime */
2607 if (!valid_lft || prefered_lft > valid_lft)
2608 return -EINVAL;
2609
53bd6749
JP		 2610 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2611 return -EINVAL;
2612
af284937
DL		 2613 dev = __dev_get_by_index(net, ifindex);
2614 if (!dev)
1da177e4 2615 return -ENODEV;
1ab1457c 2616
64e724f6
BH		 2617 idev = addrconf_add_dev(dev);
2618 if (IS_ERR(idev))
2619 return PTR_ERR(idev);
1da177e4 2620
93a714d6
MC		 2621 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2622 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2623 true, pfx, ifindex);
2624
2625 if (ret < 0)
2626 return ret;
2627 }
2628
1da177e4
LT		 2629 scope = ipv6_addr_scope(pfx);
2630
4bed72e4
YH		 2631 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2632 if (addrconf_finite_timeout(timeout)) {
2633 expires = jiffies_to_clock_t(timeout * HZ);
2634 valid_lft = timeout;
6f704992 2635 flags = RTF_EXPIRES;
4bed72e4
YH		 2636 } else {
2637 expires = 0;
2638 flags = 0;
2639 ifa_flags |= IFA_F_PERMANENT;
6f704992 2640 }
0778769d 2641
4bed72e4
YH		 2642 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2643 if (addrconf_finite_timeout(timeout)) {
2644 if (timeout == 0)
2645 ifa_flags |= IFA_F_DEPRECATED;
2646 prefered_lft = timeout;
2647 }
0778769d 2648
8a226b2c
JB		 2649 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2650 valid_lft, prefered_lft);
0778769d 2651
1da177e4 2652 if (!IS_ERR(ifp)) {
761aac73
TH		 2653 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2654 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2655 expires, flags);
2656 }
2657
95c385b4
NH		 2658 /*
2659 * Note that section 3.1 of RFC 4429 indicates
2660 * that the Optimistic flag should not be set for
2661 * manually configured addresses
2662 */
cf22f9a2 2663 addrconf_dad_start(ifp);
53bd6749
JP		 2664 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2665 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2666 true, jiffies);
1da177e4 2667 in6_ifa_put(ifp);
c15b1cca 2668 addrconf_verify_rtnl();
1da177e4 2669 return 0;
93a714d6
MC		 2670 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2671 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2672 false, pfx, ifindex);
1da177e4
LT		 2673 }
2674
2675 return PTR_ERR(ifp);
2676}
2677
6046d5b4
HK		 2678static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2679 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2680{
2681 struct inet6_ifaddr *ifp;
2682 struct inet6_dev *idev;
2683 struct net_device *dev;
1ab1457c 2684
24ef0da7
TG		 2685 if (plen > 128)
2686 return -EINVAL;
2687
af284937
DL		 2688 dev = __dev_get_by_index(net, ifindex);
2689 if (!dev)
1da177e4
LT		 2690 return -ENODEV;
2691
e5d08d71 2692 idev = __in6_dev_get(dev);
63159f29 2693 if (!idev)
1da177e4
LT		 2694 return -ENXIO;
2695
2696 read_lock_bh(&idev->lock);
502a2ffd 2697 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2698 if (ifp->prefix_len == plen &&
2699 ipv6_addr_equal(pfx, &ifp->addr)) {
2700 in6_ifa_hold(ifp);
2701 read_unlock_bh(&idev->lock);
1ab1457c 2702
6046d5b4
HK		 2703 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2704 (ifa_flags & IFA_F_MANAGETEMPADDR))
2705 manage_tempaddrs(idev, ifp, 0, 0, false,
2706 jiffies);
1da177e4 2707 ipv6_del_addr(ifp);
6046d5b4 2708 addrconf_verify_rtnl();
93a714d6
MC		 2709 if (ipv6_addr_is_multicast(pfx)) {
2710 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2711 false, pfx, dev->ifindex);
2712 }
1da177e4
LT		 2713 return 0;
2714 }
2715 }
2716 read_unlock_bh(&idev->lock);
2717 return -EADDRNOTAVAIL;
2718}
2719
2720
af284937 2721int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2722{
2723 struct in6_ifreq ireq;
2724 int err;
1ab1457c 2725
af31f412 2726 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2727 return -EPERM;
1ab1457c 2728
1da177e4
LT		 2729 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2730 return -EFAULT;
2731
2732 rtnl_lock();
caeaba79 2733 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2734 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2735 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2736 rtnl_unlock();
2737 return err;
2738}
2739
af284937 2740int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2741{
2742 struct in6_ifreq ireq;
2743 int err;
1ab1457c 2744
af31f412 2745 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2746 return -EPERM;
2747
2748 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2749 return -EFAULT;
2750
2751 rtnl_lock();
6046d5b4 2752 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2753 ireq.ifr6_prefixlen);
1da177e4
LT		 2754 rtnl_unlock();
2755 return err;
2756}
2757
b5f348e5
IJ		 2758static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2759 int plen, int scope)
2760{
2761 struct inet6_ifaddr *ifp;
2762
8a226b2c 2763 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2764 scope, IFA_F_PERMANENT,
2765 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2766 if (!IS_ERR(ifp)) {
2767 spin_lock_bh(&ifp->lock);
2768 ifp->flags &= ~IFA_F_TENTATIVE;
2769 spin_unlock_bh(&ifp->lock);
2770 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2771 in6_ifa_put(ifp);
2772 }
2773}
2774
07a93626 2775#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2776static void sit_add_v4_addrs(struct inet6_dev *idev)
2777{
1da177e4
LT		 2778 struct in6_addr addr;
2779 struct net_device *dev;
c346dca1 2780 struct net *net = dev_net(idev->dev);
929c9cf3 2781 int scope, plen;
f0e2acfa 2782 u32 pflags = 0;
1da177e4
LT		 2783
2784 ASSERT_RTNL();
2785
2786 memset(&addr, 0, sizeof(struct in6_addr));
2787 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2788
2789 if (idev->dev->flags&IFF_POINTOPOINT) {
2790 addr.s6_addr32[0] = htonl(0xfe800000);
2791 scope = IFA_LINK;
929c9cf3 2792 plen = 64;
1da177e4
LT		 2793 } else {
2794 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2795 plen = 96;
f0e2acfa 2796 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2797 }
2798
2799 if (addr.s6_addr32[3]) {
929c9cf3 2800 add_addr(idev, &addr, plen, scope);
f0e2acfa 2801 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2802 return;
2803 }
2804
6fda7350 2805 for_each_netdev(net, dev) {
8e5e8f30 2806 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2807 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2808 struct in_ifaddr *ifa;
1da177e4
LT		 2809
2810 int flag = scope;
2811
2812 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2813
2814 addr.s6_addr32[3] = ifa->ifa_local;
2815
2816 if (ifa->ifa_scope == RT_SCOPE_LINK)
2817 continue;
2818 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2819 if (idev->dev->flags&IFF_POINTOPOINT)
2820 continue;
2821 flag |= IFA_HOST;
2822 }
1da177e4 2823
b5f348e5 2824 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2825 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2826 pflags);
1da177e4
LT		 2827 }
2828 }
1ab1457c 2829 }
1da177e4 2830}
0be669bb 2831#endif
1da177e4
LT		 2832
2833static void init_loopback(struct net_device *dev)
2834{
2835 struct inet6_dev *idev;
25fb6ca4
BK		 2836 struct net_device *sp_dev;
2837 struct inet6_ifaddr *sp_ifa;
2838 struct rt6_info *sp_rt;
1da177e4
LT		 2839
2840 /* ::1 */
2841
2842 ASSERT_RTNL();
2843
e5d08d71 2844 idev = ipv6_find_idev(dev);
63159f29 2845 if (!idev) {
91df42be 2846 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2847 return;
2848 }
2849
b5f348e5 2850 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2851
2852 /* Add routes to other interface's IPv6 addresses */
2853 for_each_netdev(dev_net(dev), sp_dev) {
2854 if (!strcmp(sp_dev->name, dev->name))
2855 continue;
2856
2857 idev = __in6_dev_get(sp_dev);
2858 if (!idev)
2859 continue;
2860
2861 read_lock_bh(&idev->lock);
2862 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2863
2864 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2865 continue;
2866
33d99113
G		 2867 if (sp_ifa->rt) {
2868 /* This dst has been added to garbage list when
2869 * lo device down, release this obsolete dst and
2870 * reallocate a new router for ifa.
2871 */
2872 if (sp_ifa->rt->dst.obsolete > 0) {
2873 ip6_rt_put(sp_ifa->rt);
2874 sp_ifa->rt = NULL;
2875 } else {
2876 continue;
2877 }
2878 }
a881ae1f 2879
57ec0afe 2880 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 2881
2882 /* Failure cases are ignored */
534c8779
G		 2883 if (!IS_ERR(sp_rt)) {
2884 sp_ifa->rt = sp_rt;
25fb6ca4 2885 ip6_ins_rt(sp_rt);
534c8779 2886 }
25fb6ca4
BK		 2887 }
2888 read_unlock_bh(&idev->lock);
2889 }
1da177e4
LT		 2890}
2891
64236f3f
HFS		 2892static void addrconf_add_linklocal(struct inet6_dev *idev,
2893 const struct in6_addr *addr, u32 flags)
1da177e4 2894{
8e5e8f30 2895 struct inet6_ifaddr *ifp;
64236f3f 2896 u32 addr_flags = flags | IFA_F_PERMANENT;
95c385b4
NH		 2897
2898#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2899 if (idev->cnf.optimistic_dad &&
702beb87 2900 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2901 addr_flags |= IFA_F_OPTIMISTIC;
2902#endif
1da177e4 2903
07edd741
HFS		 2904 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2905 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 2906 if (!IS_ERR(ifp)) {
46d48046 2907 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2908 addrconf_dad_start(ifp);
1da177e4
LT		 2909 in6_ifa_put(ifp);
2910 }
2911}
2912
622c81d5
HFS		 2913static bool ipv6_reserved_interfaceid(struct in6_addr address)
2914{
2915 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2916 return true;
2917
2918 if (address.s6_addr32[2] == htonl(0x02005eff) &&
2919 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2920 return true;
2921
2922 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2923 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2924 return true;
2925
2926 return false;
2927}
2928
2929static int ipv6_generate_stable_address(struct in6_addr *address,
2930 u8 dad_count,
2931 const struct inet6_dev *idev)
2932{
622c81d5
HFS		 2933 static DEFINE_SPINLOCK(lock);
2934 static __u32 digest[SHA_DIGEST_WORDS];
2935 static __u32 workspace[SHA_WORKSPACE_WORDS];
2936
2937 static union {
2938 char __data[SHA_MESSAGE_BYTES];
2939 struct {
2940 struct in6_addr secret;
ff40217e 2941 __be32 prefix[2];
622c81d5
HFS		 2942 unsigned char hwaddr[MAX_ADDR_LEN];
2943 u8 dad_count;
2944 } __packed;
2945 } data;
2946
2947 struct in6_addr secret;
2948 struct in6_addr temp;
2949 struct net *net = dev_net(idev->dev);
2950
2951 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
2952
2953 if (idev->cnf.stable_secret.initialized)
2954 secret = idev->cnf.stable_secret.secret;
2955 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
2956 secret = net->ipv6.devconf_dflt->stable_secret.secret;
2957 else
2958 return -1;
2959
2960retry:
2961 spin_lock_bh(&lock);
2962
2963 sha_init(digest);
2964 memset(&data, 0, sizeof(data));
2965 memset(workspace, 0, sizeof(workspace));
2966 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 2967 data.prefix[0] = address->s6_addr32[0];
2968 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 2969 data.secret = secret;
2970 data.dad_count = dad_count;
2971
2972 sha_transform(digest, data.__data, workspace);
2973
2974 temp = *address;
ff40217e
HFS		 2975 temp.s6_addr32[2] = (__force __be32)digest[0];
2976 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 2977
2978 spin_unlock_bh(&lock);
2979
2980 if (ipv6_reserved_interfaceid(temp)) {
2981 dad_count++;
1855b7c3 2982 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 2983 return -1;
2984 goto retry;
2985 }
2986
2987 *address = temp;
2988 return 0;
2989}
2990
bc91b0f0
JP		 2991static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
2992{
622c81d5
HFS		 2993 struct in6_addr addr;
2994
2995 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 2996
622c81d5
HFS		 2997 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
2998 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 2999 addrconf_add_linklocal(idev, &addr,
3000 IFA_F_STABLE_PRIVACY);
622c81d5
HFS		 3001 else if (prefix_route)
3002 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3003 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
bc91b0f0
JP		 3004 /* addrconf_add_linklocal also adds a prefix_route and we
3005 * only need to care about prefix routes if ipv6_generate_eui64
3006 * couldn't generate one.
3007 */
3008 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3009 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0
JP		 3010 else if (prefix_route)
3011 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3012 }
3013}
3014
1da177e4
LT		 3015static void addrconf_dev_config(struct net_device *dev)
3016{
8e5e8f30 3017 struct inet6_dev *idev;
1da177e4
LT		 3018
3019 ASSERT_RTNL();
3020
74235a25
HX		 3021 if ((dev->type != ARPHRD_ETHER) &&
3022 (dev->type != ARPHRD_FDDI) &&
74235a25 3023 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3024 (dev->type != ARPHRD_INFINIBAND) &&
cb6bf355 3025 (dev->type != ARPHRD_IEEE802154) &&
e837735e 3026 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8
JR		 3027 (dev->type != ARPHRD_TUNNEL6) &&
3028 (dev->type != ARPHRD_6LOWPAN)) {
74235a25
HX		 3029 /* Alas, we support only Ethernet autoconfiguration. */
3030 return;
3031 }
3032
1da177e4 3033 idev = addrconf_add_dev(dev);
64e724f6 3034 if (IS_ERR(idev))
1da177e4
LT		 3035 return;
3036
bc91b0f0 3037 addrconf_addr_gen(idev, false);
1da177e4
LT		 3038}
3039
07a93626 3040#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3041static void addrconf_sit_config(struct net_device *dev)
3042{
3043 struct inet6_dev *idev;
3044
3045 ASSERT_RTNL();
3046
1ab1457c
YH		 3047 /*
3048 * Configure the tunnel with one of our IPv4
3049 * addresses... we should configure all of
1da177e4
LT		 3050 * our v4 addrs in the tunnel
3051 */
3052
e5d08d71 3053 idev = ipv6_find_idev(dev);
63159f29 3054 if (!idev) {
91df42be 3055 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3056 return;
3057 }
3058
c7dc89c0 3059 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3060 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3061 return;
3062 }
3063
1da177e4
LT		 3064 sit_add_v4_addrs(idev);
3065
62b54dd9 3066 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3067 addrconf_add_mroute(dev);
1da177e4 3068}
0be669bb 3069#endif
1da177e4 3070
07a93626 3071#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3072static void addrconf_gre_config(struct net_device *dev)
3073{
3074 struct inet6_dev *idev;
aee80b54 3075
aee80b54 3076 ASSERT_RTNL();
3077
e5d08d71 3078 idev = ipv6_find_idev(dev);
63159f29 3079 if (!idev) {
91df42be 3080 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3081 return;
3082 }
3083
bc91b0f0 3084 addrconf_addr_gen(idev, true);
aee80b54 3085}
3086#endif
3087
1ab1457c 3088static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3089 void *ptr)
1da177e4 3090{
351638e7 3091 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 3092 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 3093 int run_pending = 0;
b217d616 3094 int err;
1da177e4 3095
e21e8467 3096 switch (event) {
45ba9dd2 3097 case NETDEV_REGISTER:
74235a25 3098 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3099 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3100 if (IS_ERR(idev))
3101 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3102 }
3103 break;
bcdd553f 3104
1da177e4 3105 case NETDEV_UP:
3c21edbd 3106 case NETDEV_CHANGE:
c2edacf8
JV		 3107 if (dev->flags & IFF_SLAVE)
3108 break;
3109
3ce62a84
WC		 3110 if (idev && idev->cnf.disable_ipv6)
3111 break;
3112
3c21edbd 3113 if (event == NETDEV_UP) {
f24e3d65 3114 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 3115 /* device is not ready yet. */
f3213831 3116 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3117 dev->name);
3118 break;
3119 }
99081049 3120
d31c7b8f
EP		 3121 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3122 idev = ipv6_add_dev(dev);
3123
a317a2f1 3124 if (!IS_ERR_OR_NULL(idev)) {
99081049 3125 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3126 run_pending = 1;
3127 }
3c21edbd 3128 } else {
f24e3d65 3129 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 3130 /* device is still not ready. */
3131 break;
3132 }
3133
3134 if (idev) {
bcdd553f 3135 if (idev->if_flags & IF_READY)
3c21edbd
YH		 3136 /* device is already configured. */
3137 break;
3c21edbd
YH		 3138 idev->if_flags |= IF_READY;
3139 }
3140
f3213831
JP		 3141 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3142 dev->name);
3c21edbd 3143
c5e33bdd 3144 run_pending = 1;
3c21edbd
YH		 3145 }
3146
e21e8467 3147 switch (dev->type) {
07a93626 3148#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3149 case ARPHRD_SIT:
3150 addrconf_sit_config(dev);
3151 break;
aee80b54 3152#endif
07a93626 3153#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3154 case ARPHRD_IPGRE:
3155 addrconf_gre_config(dev);
3156 break;
0be669bb 3157#endif
1da177e4
LT		 3158 case ARPHRD_LOOPBACK:
3159 init_loopback(dev);
3160 break;
3161
3162 default:
3163 addrconf_dev_config(dev);
3164 break;
3ff50b79 3165 }
bcdd553f 3166
a317a2f1 3167 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3168 if (run_pending)
3169 addrconf_dad_run(idev);
3170
bcdd553f
SH		 3171 /*
3172 * If the MTU changed during the interface down,
3173 * when the interface up, the changed MTU must be
3174 * reflected in the idev as well as routers.
1da177e4 3175 */
bcdd553f
SH		 3176 if (idev->cnf.mtu6 != dev->mtu &&
3177 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3178 rt6_mtu_change(dev, dev->mtu);
3179 idev->cnf.mtu6 = dev->mtu;
3180 }
3181 idev->tstamp = jiffies;
3182 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3183
3184 /*
3185 * If the changed mtu during down is lower than
3186 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3187 */
3188 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 3189 addrconf_ifdown(dev, 1);
1da177e4
LT		 3190 }
3191 break;
3192
3193 case NETDEV_CHANGEMTU:
d31c7b8f 3194 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3195 rt6_mtu_change(dev, dev->mtu);
3196 idev->cnf.mtu6 = dev->mtu;
3197 break;
3198 }
3199
d31c7b8f
EP		 3200 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3201 idev = ipv6_add_dev(dev);
a317a2f1 3202 if (!IS_ERR(idev))
d31c7b8f
EP		 3203 break;
3204 }
3205
bcdd553f 3206 /*
db9c7c39 3207 * if MTU under IPV6_MIN_MTU.
bcdd553f
SH		 3208 * Stop IPv6 on this interface.
3209 */
1da177e4
LT		 3210
3211 case NETDEV_DOWN:
3212 case NETDEV_UNREGISTER:
3213 /*
3214 * Remove all addresses from this interface.
3215 */
3216 addrconf_ifdown(dev, event != NETDEV_DOWN);
3217 break;
3c21edbd 3218
1da177e4 3219 case NETDEV_CHANGENAME:
1da177e4 3220 if (idev) {
5632c515 3221 snmp6_unregister_dev(idev);
408c4768 3222 addrconf_sysctl_unregister(idev);
a317a2f1 3223 err = addrconf_sysctl_register(idev);
b217d616
HX		 3224 if (err)
3225 return notifier_from_errno(err);
a317a2f1
WC		 3226 err = snmp6_register_dev(idev);
3227 if (err) {
3228 addrconf_sysctl_unregister(idev);
3229 return notifier_from_errno(err);
3230 }
5632c515 3231 }
1da177e4 3232 break;
bcdd553f 3233
93d9b7d7
JP		 3234 case NETDEV_PRE_TYPE_CHANGE:
3235 case NETDEV_POST_TYPE_CHANGE:
3236 addrconf_type_change(dev, event);
75c78500 3237 break;
3ff50b79 3238 }
1da177e4
LT		 3239
3240 return NOTIFY_OK;
3241}
3242
3243/*
3244 * addrconf module should be notified of a device going up
3245 */
3246static struct notifier_block ipv6_dev_notf = {
3247 .notifier_call = addrconf_notify,
1da177e4
LT		 3248};
3249
93d9b7d7 3250static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3251{
3252 struct inet6_dev *idev;
3253 ASSERT_RTNL();
3254
3255 idev = __in6_dev_get(dev);
3256
93d9b7d7 3257 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3258 ipv6_mc_remap(idev);
93d9b7d7 3259 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3260 ipv6_mc_unmap(idev);
3261}
3262
1da177e4
LT		 3263static int addrconf_ifdown(struct net_device *dev, int how)
3264{
c346dca1 3265 struct net *net = dev_net(dev);
502a2ffd 3266 struct inet6_dev *idev;
3267 struct inet6_ifaddr *ifa;
73a8bd74 3268 int state, i;
1da177e4
LT		 3269
3270 ASSERT_RTNL();
3271
73a8bd74
DM		 3272 rt6_ifdown(net, dev);
3273 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3274
3275 idev = __in6_dev_get(dev);
63159f29 3276 if (!idev)
1da177e4
LT		 3277 return -ENODEV;
3278
bcdd553f
SH		 3279 /*
3280 * Step 1: remove reference to ipv6 device from parent device.
3281 * Do not dev_put!
1da177e4 3282 */
439e2385 3283 if (how) {
1da177e4 3284 idev->dead = 1;
8814c4b5
YH		 3285
3286 /* protected by rtnl_lock */
a9b3cd7f 3287 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3288
3289 /* Step 1.5: remove snmp6 entry */
3290 snmp6_unregister_dev(idev);
3291
3292 }
3293
73a8bd74
DM		 3294 /* Step 2: clear hash table */
3295 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3296 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3297
3298 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3299restart:
b67bfe0d 3300 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74
DM		 3301 if (ifa->idev == idev) {
3302 hlist_del_init_rcu(&ifa->addr_lst);
c15b1cca 3303 addrconf_del_dad_work(ifa);
73a8bd74
DM		 3304 goto restart;
3305 }
3306 }
3307 spin_unlock_bh(&addrconf_hash_lock);
3308 }
3309
1da177e4
LT		 3310 write_lock_bh(&idev->lock);
3311
b7b1bfce
HFS		 3312 addrconf_del_rs_timer(idev);
3313
bcdd553f 3314 /* Step 2: clear flags for stateless addrconf */
439e2385 3315 if (!how)
3c21edbd 3316 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3317
439e2385 3318 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 3319 in6_dev_put(idev);
3320
bcdd553f 3321 /* Step 3: clear tempaddr list */
372e6c8f 3322 while (!list_empty(&idev->tempaddr_list)) {
3323 ifa = list_first_entry(&idev->tempaddr_list,
3324 struct inet6_ifaddr, tmp_list);
3325 list_del(&ifa->tmp_list);
1da177e4
LT		 3326 write_unlock_bh(&idev->lock);
3327 spin_lock_bh(&ifa->lock);
3328
3329 if (ifa->ifpub) {
3330 in6_ifa_put(ifa->ifpub);
3331 ifa->ifpub = NULL;
3332 }
3333 spin_unlock_bh(&ifa->lock);
3334 in6_ifa_put(ifa);
3335 write_lock_bh(&idev->lock);
3336 }
8f37ada5 3337
502a2ffd 3338 while (!list_empty(&idev->addr_list)) {
3339 ifa = list_first_entry(&idev->addr_list,
3340 struct inet6_ifaddr, if_list);
c15b1cca 3341 addrconf_del_dad_work(ifa);
84e8b803 3342
73a8bd74 3343 list_del(&ifa->if_list);
84e8b803 3344
73a8bd74 3345 write_unlock_bh(&idev->lock);
84e8b803 3346
8e8e676d 3347 spin_lock_bh(&ifa->lock);
73a8bd74
DM		 3348 state = ifa->state;
3349 ifa->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 3350 spin_unlock_bh(&ifa->lock);
9d82ca98 3351
73a8bd74
DM		 3352 if (state != INET6_IFADDR_STATE_DEAD) {
3353 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3354 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 3355 }
73a8bd74 3356 in6_ifa_put(ifa);
8f37ada5 3357
73a8bd74
DM		 3358 write_lock_bh(&idev->lock);
3359 }
8f37ada5 3360
1da177e4
LT		 3361 write_unlock_bh(&idev->lock);
3362
381f4dca
SD		 3363 /* Step 5: Discard anycast and multicast list */
3364 if (how) {
3365 ipv6_ac_destroy_dev(idev);
1da177e4 3366 ipv6_mc_destroy_dev(idev);
381f4dca 3367 } else {
1da177e4 3368 ipv6_mc_down(idev);
381f4dca 3369 }
1da177e4 3370
1da177e4 3371 idev->tstamp = jiffies;
1ab1457c 3372
bcdd553f 3373 /* Last: Shot the device (if unregistered) */
439e2385 3374 if (how) {
408c4768 3375 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3376 neigh_parms_release(&nd_tbl, idev->nd_parms);
3377 neigh_ifdown(&nd_tbl, dev);
3378 in6_dev_put(idev);
3379 }
3380 return 0;
3381}
3382
3383static void addrconf_rs_timer(unsigned long data)
3384{
b7b1bfce 3385 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3386 struct net_device *dev = idev->dev;
b7b1bfce 3387 struct in6_addr lladdr;
1da177e4 3388
b7b1bfce 3389 write_lock(&idev->lock);
5b2a1953 3390 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3391 goto out;
3392
9ba2add3 3393 if (!ipv6_accept_ra(idev))
5b2a1953 3394 goto out;
3395
3396 /* Announcement received after solicitation was sent */
3397 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3398 goto out;
1da177e4 3399
b7b1bfce 3400 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
caf92bc4
CW		 3401 write_unlock(&idev->lock);
3402 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3403 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3404 &in6addr_linklocal_allrouters);
3405 else
caf92bc4 3406 goto put;
1da177e4 3407
caf92bc4 3408 write_lock(&idev->lock);
b7b1bfce
HFS		 3409 /* The wait after the last probe can be shorter */
3410 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3411 idev->cnf.rtr_solicits) ?
3412 idev->cnf.rtr_solicit_delay :
3413 idev->cnf.rtr_solicit_interval);
1da177e4 3414 } else {
1da177e4
LT		 3415 /*
3416 * Note: we do not support deprecated "all on-link"
3417 * assumption any longer.
3418 */
91df42be 3419 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3420 }
3421
3422out:
b7b1bfce 3423 write_unlock(&idev->lock);
caf92bc4 3424put:
b7b1bfce 3425 in6_dev_put(idev);
1da177e4
LT		 3426}
3427
3428/*
3429 * Duplicate Address Detection
3430 */
3c21edbd
YH		 3431static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3432{
3433 unsigned long rand_num;
3434 struct inet6_dev *idev = ifp->idev;
3435
95c385b4
NH		 3436 if (ifp->flags & IFA_F_OPTIMISTIC)
3437 rand_num = 0;
3438 else
63862b5b 3439 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3440
b7b1bfce 3441 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3442 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3443}
3444
c15b1cca 3445static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3446{
3447 struct inet6_dev *idev = ifp->idev;
3448 struct net_device *dev = idev->dev;
1da177e4
LT		 3449
3450 addrconf_join_solict(dev, &ifp->addr);
3451
63862b5b 3452 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3453
3454 read_lock_bh(&idev->lock);
622ccdf1 3455 spin_lock(&ifp->lock);
e9d3e084 3456 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3457 goto out;
1da177e4
LT		 3458
3459 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3460 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3461 !(ifp->flags&IFA_F_TENTATIVE) ||
3462 ifp->flags & IFA_F_NODAD) {
cc411d0b 3463 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3464 spin_unlock(&ifp->lock);
1da177e4
LT		 3465 read_unlock_bh(&idev->lock);
3466
3467 addrconf_dad_completed(ifp);
3468 return;
3469 }
3470
6732bade 3471 if (!(idev->if_flags & IF_READY)) {
21809faf 3472 spin_unlock(&ifp->lock);
6732bade 3473 read_unlock_bh(&idev->lock);
3c21edbd 3474 /*
590a9887 3475 * If the device is not ready:
3c21edbd
YH		 3476 * - keep it tentative if it is a permanent address.
3477 * - otherwise, kill it.
3478 */
3479 in6_ifa_hold(ifp);
cc411d0b 3480 addrconf_dad_stop(ifp, 0);
6732bade 3481 return;
3c21edbd 3482 }
95c385b4
NH		 3483
3484 /*
3485 * Optimistic nodes can start receiving
3486 * Frames right away
3487 */
7fd2561e 3488 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3489 ip6_ins_rt(ifp->rt);
7fd2561e
EK		 3490 if (ipv6_use_optimistic_addr(idev)) {
3491 /* Because optimistic nodes can use this address,
3492 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3493 */
3494 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3495 }
3496 }
95c385b4 3497
6732bade 3498 addrconf_dad_kick(ifp);
1da177e4 3499out:
622ccdf1 3500 spin_unlock(&ifp->lock);
1da177e4
LT		 3501 read_unlock_bh(&idev->lock);
3502}
3503
c15b1cca 3504static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3505{
c15b1cca
HFS		 3506 bool begin_dad = false;
3507
8e8e676d 3508 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3509 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3510 ifp->state = INET6_IFADDR_STATE_PREDAD;
3511 begin_dad = true;
3512 }
8e8e676d 3513 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3514
3515 if (begin_dad)
3516 addrconf_mod_dad_work(ifp, 0);
3517}
3518
3519static void addrconf_dad_work(struct work_struct *w)
3520{
3521 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3522 struct inet6_ifaddr,
3523 dad_work);
1da177e4 3524 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3525 struct in6_addr mcaddr;
3526
c15b1cca
HFS		 3527 enum {
3528 DAD_PROCESS,
3529 DAD_BEGIN,
3530 DAD_ABORT,
3531 } action = DAD_PROCESS;
3532
3533 rtnl_lock();
3534
8e8e676d 3535 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3536 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3537 action = DAD_BEGIN;
3538 ifp->state = INET6_IFADDR_STATE_DAD;
3539 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3540 action = DAD_ABORT;
3541 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3542 }
8e8e676d 3543 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3544
3545 if (action == DAD_BEGIN) {
3546 addrconf_dad_begin(ifp);
3547 goto out;
3548 } else if (action == DAD_ABORT) {
3549 addrconf_dad_stop(ifp, 1);
3550 goto out;
3551 }
3552
b7b1bfce 3553 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3554 goto out;
3555
c15b1cca 3556 write_lock_bh(&idev->lock);
122e4519 3557 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3558 write_unlock_bh(&idev->lock);
1da177e4
LT		 3559 goto out;
3560 }
21809faf 3561
3562 spin_lock(&ifp->lock);
622ccdf1
HX		 3563 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3564 spin_unlock(&ifp->lock);
c15b1cca 3565 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3566 goto out;
3567 }
3568
b7b1bfce 3569 if (ifp->dad_probes == 0) {
1da177e4
LT		 3570 /*
3571 * DAD was successful
3572 */
3573
cc411d0b 3574 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3575 spin_unlock(&ifp->lock);
c15b1cca 3576 write_unlock_bh(&idev->lock);
1da177e4
LT		 3577
3578 addrconf_dad_completed(ifp);
3579
3580 goto out;
3581 }
3582
b7b1bfce 3583 ifp->dad_probes--;
c15b1cca
HFS		 3584 addrconf_mod_dad_work(ifp,
3585 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3586 spin_unlock(&ifp->lock);
c15b1cca 3587 write_unlock_bh(&idev->lock);
1da177e4
LT		 3588
3589 /* send a neighbour solicitation for our addr */
1da177e4 3590 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3591 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3592out:
3593 in6_ifa_put(ifp);
c15b1cca 3594 rtnl_unlock();
1da177e4
LT		 3595}
3596
11ffff75
HFS		 3597/* ifp->idev must be at least read locked */
3598static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3599{
3600 struct inet6_ifaddr *ifpiter;
3601 struct inet6_dev *idev = ifp->idev;
3602
602582ca
HFS		 3603 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3604 if (ifpiter->scope > IFA_LINK)
3605 break;
11ffff75
HFS		 3606 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3607 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3608 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3609 IFA_F_PERMANENT)
3610 return false;
3611 }
3612 return true;
3613}
3614
1da177e4
LT		 3615static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3616{
e21e8467 3617 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3618 struct in6_addr lladdr;
b173ee48 3619 bool send_rs, send_mld;
b7b1bfce 3620
c15b1cca 3621 addrconf_del_dad_work(ifp);
1da177e4
LT		 3622
3623 /*
3624 * Configure the address for reception. Now it is valid.
3625 */
3626
3627 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3628
026359bc
TA		 3629 /* If added prefix is link local and we are prepared to process
3630 router advertisements, start sending router solicitations.
1da177e4
LT		 3631 */
3632
1ec047eb 3633 read_lock_bh(&ifp->idev->lock);
11ffff75 3634 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 3635 send_rs = send_mld &&
3636 ipv6_accept_ra(ifp->idev) &&
1ec047eb 3637 ifp->idev->cnf.rtr_solicits > 0 &&
b173ee48 3638 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 3639 read_unlock_bh(&ifp->idev->lock);
3640
b173ee48
HFS		 3641 /* While dad is in progress mld report's source address is in6_addrany.
3642 * Resend with proper ll now.
3643 */
3644 if (send_mld)
3645 ipv6_mc_dad_complete(ifp->idev);
3646
1ec047eb 3647 if (send_rs) {
1da177e4
LT		 3648 /*
3649 * If a host as already performed a random delay
3650 * [...] as part of DAD [...] there is no need
3651 * to delay again before sending the first RS
3652 */
1ec047eb 3653 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 3654 return;
1ec047eb 3655 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 3656
b7b1bfce
HFS		 3657 write_lock_bh(&ifp->idev->lock);
3658 spin_lock(&ifp->lock);
3659 ifp->idev->rs_probes = 1;
1da177e4 3660 ifp->idev->if_flags |= IF_RS_SENT;
b7b1bfce
HFS		 3661 addrconf_mod_rs_timer(ifp->idev,
3662 ifp->idev->cnf.rtr_solicit_interval);
3663 spin_unlock(&ifp->lock);
3664 write_unlock_bh(&ifp->idev->lock);
1da177e4
LT		 3665 }
3666}
3667
e21e8467
SH		 3668static void addrconf_dad_run(struct inet6_dev *idev)
3669{
c5e33bdd
YH		 3670 struct inet6_ifaddr *ifp;
3671
3672 read_lock_bh(&idev->lock);
502a2ffd 3673 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3674 spin_lock(&ifp->lock);
f2344a13
HX		 3675 if (ifp->flags & IFA_F_TENTATIVE &&
3676 ifp->state == INET6_IFADDR_STATE_DAD)
3677 addrconf_dad_kick(ifp);
21809faf 3678 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3679 }
3680 read_unlock_bh(&idev->lock);
3681}
3682
1da177e4
LT		 3683#ifdef CONFIG_PROC_FS
3684struct if6_iter_state {
3c40090a 3685 struct seq_net_private p;
1da177e4 3686 int bucket;
1d578303 3687 int offset;
1da177e4
LT		 3688};
3689
1d578303 3690static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3691{
3692 struct inet6_ifaddr *ifa = NULL;
3693 struct if6_iter_state *state = seq->private;
1218854a 3694 struct net *net = seq_file_net(seq);
1d578303 3695 int p = 0;
1da177e4 3696
1d578303
MM		 3697 /* initial bucket if pos is 0 */
3698 if (pos == 0) {
3699 state->bucket = 0;
3700 state->offset = 0;
3701 }
3702
3703 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3704 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3705 addr_lst) {
9f0d3c27
ED		 3706 if (!net_eq(dev_net(ifa->idev->dev), net))
3707 continue;
1d578303
MM		 3708 /* sync with offset */
3709 if (p < state->offset) {
3710 p++;
3711 continue;
3712 }
3713 state->offset++;
9f0d3c27 3714 return ifa;
1d578303
MM		 3715 }
3716
3717 /* prepare for next bucket */
3718 state->offset = 0;
3719 p = 0;
1da177e4 3720 }
c2e21293 3721 return NULL;
1da177e4
LT		 3722}
3723
c2e21293 3724static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3725 struct inet6_ifaddr *ifa)
1da177e4
LT		 3726{
3727 struct if6_iter_state *state = seq->private;
1218854a 3728 struct net *net = seq_file_net(seq);
1da177e4 3729
b67bfe0d 3730 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3731 if (!net_eq(dev_net(ifa->idev->dev), net))
3732 continue;
1d578303 3733 state->offset++;
9f0d3c27 3734 return ifa;
1d578303 3735 }
3c40090a 3736
c2e21293 3737 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3738 state->offset = 0;
b67bfe0d 3739 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3740 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3741 if (!net_eq(dev_net(ifa->idev->dev), net))
3742 continue;
1d578303 3743 state->offset++;
9f0d3c27 3744 return ifa;
c2e21293 3745 }
1da177e4 3746 }
3c40090a 3747
c2e21293 3748 return NULL;
1da177e4
LT		 3749}
3750
1da177e4 3751static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3752 __acquires(rcu_bh)
1da177e4 3753{
5c578aed 3754 rcu_read_lock_bh();
1d578303 3755 return if6_get_first(seq, *pos);
1da177e4
LT		 3756}
3757
3758static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3759{
3760 struct inet6_ifaddr *ifa;
3761
3762 ifa = if6_get_next(seq, v);
3763 ++*pos;
3764 return ifa;
3765}
3766
3767static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3768 __releases(rcu_bh)
1da177e4 3769{
5c578aed 3770 rcu_read_unlock_bh();
1da177e4
LT		 3771}
3772
3773static int if6_seq_show(struct seq_file *seq, void *v)
3774{
3775 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 3776 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3777 &ifp->addr,
1da177e4
LT		 3778 ifp->idev->dev->ifindex,
3779 ifp->prefix_len,
3780 ifp->scope,
971a351c 3781 (u8) ifp->flags,
1da177e4
LT		 3782 ifp->idev->dev->name);
3783 return 0;
3784}
3785
56b3d975 3786static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3787 .start = if6_seq_start,
3788 .next = if6_seq_next,
3789 .show = if6_seq_show,
3790 .stop = if6_seq_stop,
3791};
3792
3793static int if6_seq_open(struct inode *inode, struct file *file)
3794{
3c40090a
DL		 3795 return seq_open_net(inode, file, &if6_seq_ops,
3796 sizeof(struct if6_iter_state));
1da177e4
LT		 3797}
3798
9a32144e 3799static const struct file_operations if6_fops = {
1da177e4
LT		 3800 .owner = THIS_MODULE,
3801 .open = if6_seq_open,
3802 .read = seq_read,
3803 .llseek = seq_lseek,
3c40090a 3804 .release = seq_release_net,
1da177e4
LT		 3805};
3806
2c8c1e72 3807static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3808{
d4beaa66 3809 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 3810 return -ENOMEM;
3811 return 0;
3812}
3813
2c8c1e72 3814static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 3815{
ece31ffd 3816 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 3817}
3818
3819static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 3820 .init = if6_proc_net_init,
3821 .exit = if6_proc_net_exit,
3c40090a
DL		 3822};
3823
3824int __init if6_proc_init(void)
3825{
3826 return register_pernet_subsys(&if6_proc_net_ops);
3827}
3828
1da177e4
LT		 3829void if6_proc_exit(void)
3830{
3c40090a 3831 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3832}
3833#endif /* CONFIG_PROC_FS */
3834
07a93626 3835#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3836/* Check if address is a home address configured on any interface. */
b71d1d42 3837int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3838{
3839 int ret = 0;
c2e21293 3840 struct inet6_ifaddr *ifp = NULL;
ddbe5032 3841 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3842
5c578aed 3843 rcu_read_lock_bh();
b67bfe0d 3844 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 3845 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3846 continue;
caad295f 3847 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3848 (ifp->flags & IFA_F_HOMEADDRESS)) {
3849 ret = 1;
3850 break;
3851 }
3852 }
5c578aed 3853 rcu_read_unlock_bh();
3b9f9a1c
NT		 3854 return ret;
3855}
3856#endif
3857
1da177e4
LT		 3858/*
3859 * Periodic address status verification
3860 */
3861
c15b1cca 3862static void addrconf_verify_rtnl(void)
1da177e4 3863{
b2db7564 3864 unsigned long now, next, next_sec, next_sched;
1da177e4 3865 struct inet6_ifaddr *ifp;
1da177e4
LT		 3866 int i;
3867
c15b1cca
HFS		 3868 ASSERT_RTNL();
3869
5c578aed 3870 rcu_read_lock_bh();
1da177e4 3871 now = jiffies;
b2db7564 3872 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 3873
c15b1cca 3874 cancel_delayed_work(&addr_chk_work);
1da177e4 3875
bcdd553f 3876 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3877restart:
c15b1cca 3878 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 3879 unsigned long age;
1da177e4 3880
fad8da3e
YA		 3881 /* When setting preferred_lft to a value not zero or
3882 * infinity, while valid_lft is infinity
3883 * IFA_F_PERMANENT has a non-infinity life time.
3884 */
3885 if ((ifp->flags & IFA_F_PERMANENT) &&
3886 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 3887 continue;
3888
3889 spin_lock(&ifp->lock);
b2db7564
YH		 3890 /* We try to batch several events at once. */
3891 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3892
8f27ebb9
YH		 3893 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3894 age >= ifp->valid_lft) {
1da177e4
LT		 3895 spin_unlock(&ifp->lock);
3896 in6_ifa_hold(ifp);
1da177e4
LT		 3897 ipv6_del_addr(ifp);
3898 goto restart;
8f27ebb9
YH		 3899 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3900 spin_unlock(&ifp->lock);
3901 continue;
1da177e4 3902 } else if (age >= ifp->prefered_lft) {
a1ed0526 3903 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3904 int deprecate = 0;
3905
3906 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3907 deprecate = 1;
3908 ifp->flags |= IFA_F_DEPRECATED;
3909 }
3910
fad8da3e
YA		 3911 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3912 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 3913 next = ifp->tstamp + ifp->valid_lft * HZ;
3914
3915 spin_unlock(&ifp->lock);
3916
3917 if (deprecate) {
3918 in6_ifa_hold(ifp);
1da177e4
LT		 3919
3920 ipv6_ifa_notify(0, ifp);
3921 in6_ifa_put(ifp);
3922 goto restart;
3923 }
1da177e4
LT		 3924 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3925 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3926 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3927 ifp->idev->cnf.dad_transmits *
1f9248e5 3928 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 3929
1da177e4
LT		 3930 if (age >= ifp->prefered_lft - regen_advance) {
3931 struct inet6_ifaddr *ifpub = ifp->ifpub;
3932 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3933 next = ifp->tstamp + ifp->prefered_lft * HZ;
3934 if (!ifp->regen_count && ifpub) {
3935 ifp->regen_count++;
3936 in6_ifa_hold(ifp);
3937 in6_ifa_hold(ifpub);
3938 spin_unlock(&ifp->lock);
5c578aed 3939
291d809b
HY		 3940 spin_lock(&ifpub->lock);
3941 ifpub->regen_count = 0;
3942 spin_unlock(&ifpub->lock);
1da177e4
LT		 3943 ipv6_create_tempaddr(ifpub, ifp);
3944 in6_ifa_put(ifpub);
3945 in6_ifa_put(ifp);
3946 goto restart;
3947 }
3948 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3949 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3950 spin_unlock(&ifp->lock);
1da177e4
LT		 3951 } else {
3952 /* ifp->prefered_lft <= ifp->valid_lft */
3953 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3954 next = ifp->tstamp + ifp->prefered_lft * HZ;
3955 spin_unlock(&ifp->lock);
3956 }
3957 }
1da177e4
LT		 3958 }
3959
b2db7564
YH		 3960 next_sec = round_jiffies_up(next);
3961 next_sched = next;
3962
3963 /* If rounded timeout is accurate enough, accept it. */
3964 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3965 next_sched = next_sec;
3966
3967 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3968 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3969 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3970
ba3542e1 3971 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3972 now, next, next_sec, next_sched);
c15b1cca 3973 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 3974 rcu_read_unlock_bh();
1da177e4
LT		 3975}
3976
c15b1cca
HFS		 3977static void addrconf_verify_work(struct work_struct *w)
3978{
3979 rtnl_lock();
3980 addrconf_verify_rtnl();
3981 rtnl_unlock();
3982}
3983
3984static void addrconf_verify(void)
3985{
3986 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
3987}
3988
caeaba79
ND		 3989static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3990 struct in6_addr **peer_pfx)
461d8837
TG		 3991{
3992 struct in6_addr *pfx = NULL;
3993
caeaba79
ND		 3994 *peer_pfx = NULL;
3995
461d8837
TG		 3996 if (addr)
3997 pfx = nla_data(addr);
3998
3999 if (local) {
4000 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4001 *peer_pfx = pfx;
4002 pfx = nla_data(local);
461d8837
TG		 4003 }
4004
4005 return pfx;
4006}
4007
ef7c79ed 4008static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4009 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4010 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4011 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4012 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 4013};
4014
1da177e4 4015static int
661d2967 4016inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4017{
3b1e0a65 4018 struct net *net = sock_net(skb->sk);
b933f716
TG		 4019 struct ifaddrmsg *ifm;
4020 struct nlattr *tb[IFA_MAX+1];
caeaba79 4021 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4022 u32 ifa_flags;
b933f716 4023 int err;
1da177e4 4024
b933f716
TG		 4025 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4026 if (err < 0)
4027 return err;
4028
4029 ifm = nlmsg_data(nlh);
caeaba79 4030 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4031 if (!pfx)
1da177e4
LT		 4032 return -EINVAL;
4033
6046d5b4
HK		 4034 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4035
4036 /* We ignore other flags so far. */
4037 ifa_flags &= IFA_F_MANAGETEMPADDR;
4038
4039 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4040 ifm->ifa_prefixlen);
1da177e4
LT		 4041}
4042
479840ff 4043static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 4044 u32 prefered_lft, u32 valid_lft)
081bba5b 4045{
6f704992
YH		 4046 u32 flags;
4047 clock_t expires;
4bed72e4 4048 unsigned long timeout;
53bd6749 4049 bool was_managetempaddr;
5b84efec 4050 bool had_prefixroute;
46d48046 4051
c15b1cca
HFS		 4052 ASSERT_RTNL();
4053
081bba5b
NT		 4054 if (!valid_lft || (prefered_lft > valid_lft))
4055 return -EINVAL;
4056
53bd6749
JP		 4057 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4058 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4059 return -EINVAL;
4060
4bed72e4
YH		 4061 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4062 if (addrconf_finite_timeout(timeout)) {
4063 expires = jiffies_to_clock_t(timeout * HZ);
4064 valid_lft = timeout;
6f704992 4065 flags = RTF_EXPIRES;
4bed72e4
YH		 4066 } else {
4067 expires = 0;
4068 flags = 0;
4069 ifa_flags |= IFA_F_PERMANENT;
6f704992 4070 }
081bba5b 4071
4bed72e4
YH		 4072 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4073 if (addrconf_finite_timeout(timeout)) {
4074 if (timeout == 0)
4075 ifa_flags |= IFA_F_DEPRECATED;
4076 prefered_lft = timeout;
4077 }
081bba5b
NT		 4078
4079 spin_lock_bh(&ifp->lock);
53bd6749 4080 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4081 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4082 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4083 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4084 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4085 IFA_F_NOPREFIXROUTE);
53bd6749 4086 ifp->flags |= ifa_flags;
081bba5b
NT		 4087 ifp->tstamp = jiffies;
4088 ifp->valid_lft = valid_lft;
4089 ifp->prefered_lft = prefered_lft;
4090
4091 spin_unlock_bh(&ifp->lock);
4092 if (!(ifp->flags&IFA_F_TENTATIVE))
4093 ipv6_ifa_notify(0, ifp);
081bba5b 4094
761aac73
TH		 4095 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4096 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4097 expires, flags);
5b84efec
TH		 4098 } else if (had_prefixroute) {
4099 enum cleanup_prefix_rt_t action;
4100 unsigned long rt_expires;
4101
4102 write_lock_bh(&ifp->idev->lock);
4103 action = check_cleanup_prefix_route(ifp, &rt_expires);
4104 write_unlock_bh(&ifp->idev->lock);
4105
4106 if (action != CLEANUP_PREFIX_RT_NOP) {
4107 cleanup_prefix_route(ifp, rt_expires,
4108 action == CLEANUP_PREFIX_RT_DEL);
4109 }
761aac73 4110 }
53bd6749
JP		 4111
4112 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4113 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4114 valid_lft = prefered_lft = 0;
4115 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4116 !was_managetempaddr, jiffies);
4117 }
4118
c15b1cca 4119 addrconf_verify_rtnl();
081bba5b
NT		 4120
4121 return 0;
4122}
4123
1da177e4 4124static int
661d2967 4125inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4126{
3b1e0a65 4127 struct net *net = sock_net(skb->sk);
461d8837
TG		 4128 struct ifaddrmsg *ifm;
4129 struct nlattr *tb[IFA_MAX+1];
caeaba79 4130 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 4131 struct inet6_ifaddr *ifa;
4132 struct net_device *dev;
55ebaef1 4133 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 4134 u32 ifa_flags;
461d8837 4135 int err;
1da177e4 4136
461d8837
TG		 4137 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4138 if (err < 0)
4139 return err;
4140
4141 ifm = nlmsg_data(nlh);
caeaba79 4142 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4143 if (!pfx)
1da177e4
LT		 4144 return -EINVAL;
4145
461d8837 4146 if (tb[IFA_CACHEINFO]) {
0778769d 4147 struct ifa_cacheinfo *ci;
461d8837
TG		 4148
4149 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 4150 valid_lft = ci->ifa_valid;
461d8837
TG		 4151 preferred_lft = ci->ifa_prefered;
4152 } else {
4153 preferred_lft = INFINITY_LIFE_TIME;
4154 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 4155 }
4156
af284937 4157 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4158 if (!dev)
7198f8ce
TG		 4159 return -ENODEV;
4160
479840ff
JP		 4161 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4162
55ebaef1 4163 /* We ignore other flags so far. */
761aac73 4164 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
93a714d6 4165 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
55ebaef1 4166
1cab3da6 4167 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
63159f29 4168 if (!ifa) {
7198f8ce
TG		 4169 /*
4170 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4171 * userspace already relies on not having to provide this.
7198f8ce 4172 */
caeaba79 4173 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 4174 ifm->ifa_prefixlen, ifa_flags,
4175 preferred_lft, valid_lft);
081bba5b
NT		 4176 }
4177
7198f8ce
TG		 4178 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4179 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4180 err = -EEXIST;
4181 else
55ebaef1 4182 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 4183
4184 in6_ifa_put(ifa);
4185
4186 return err;
1da177e4
LT		 4187}
4188
479840ff 4189static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4190 u8 scope, int ifindex)
4191{
4192 struct ifaddrmsg *ifm;
4193
4194 ifm = nlmsg_data(nlh);
4195 ifm->ifa_family = AF_INET6;
4196 ifm->ifa_prefixlen = prefixlen;
4197 ifm->ifa_flags = flags;
4198 ifm->ifa_scope = scope;
4199 ifm->ifa_index = ifindex;
4200}
4201
85486af0
TG		 4202static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4203 unsigned long tstamp, u32 preferred, u32 valid)
4204{
4205 struct ifa_cacheinfo ci;
4206
18a31e1e
TG		 4207 ci.cstamp = cstamp_delta(cstamp);
4208 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4209 ci.ifa_prefered = preferred;
4210 ci.ifa_valid = valid;
4211
4212 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4213}
4214
101bb229
TG		 4215static inline int rt_scope(int ifa_scope)
4216{
4217 if (ifa_scope & IFA_HOST)
4218 return RT_SCOPE_HOST;
4219 else if (ifa_scope & IFA_LINK)
4220 return RT_SCOPE_LINK;
4221 else if (ifa_scope & IFA_SITE)
4222 return RT_SCOPE_SITE;
4223 else
4224 return RT_SCOPE_UNIVERSE;
4225}
4226
0ab6803b
TG		 4227static inline int inet6_ifaddr_msgsize(void)
4228{
339bf98f 4229 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4230 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4231 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4232 + nla_total_size(sizeof(struct ifa_cacheinfo))
4233 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4234}
c5396a31 4235
1da177e4 4236static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4237 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4238{
1da177e4 4239 struct nlmsghdr *nlh;
85486af0 4240 u32 preferred, valid;
1da177e4 4241
15e47304 4242 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4243 if (!nlh)
26932566 4244 return -EMSGSIZE;
0ab6803b 4245
101bb229
TG		 4246 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4247 ifa->idev->dev->ifindex);
4248
fad8da3e
YA		 4249 if (!((ifa->flags&IFA_F_PERMANENT) &&
4250 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4251 preferred = ifa->prefered_lft;
4252 valid = ifa->valid_lft;
4253 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4254 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4255 if (preferred > tval)
4256 preferred -= tval;
4257 else
4258 preferred = 0;
f56619fc
BH		 4259 if (valid != INFINITY_LIFE_TIME) {
4260 if (valid > tval)
4261 valid -= tval;
4262 else
4263 valid = 0;
4264 }
1da177e4
LT		 4265 }
4266 } else {
85486af0
TG		 4267 preferred = INFINITY_LIFE_TIME;
4268 valid = INFINITY_LIFE_TIME;
4269 }
4270
7996c799 4271 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4272 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4273 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4274 goto error;
4275 } else
930345ea 4276 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4277 goto error;
4278
4279 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4280 goto error;
1da177e4 4281
479840ff
JP		 4282 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4283 goto error;
4284
053c095a
JB		 4285 nlmsg_end(skb, nlh);
4286 return 0;
caeaba79
ND		 4287
4288error:
4289 nlmsg_cancel(skb, nlh);
4290 return -EMSGSIZE;
1da177e4
LT		 4291}
4292
4293static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4294 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4295{
1da177e4 4296 struct nlmsghdr *nlh;
101bb229
TG		 4297 u8 scope = RT_SCOPE_UNIVERSE;
4298 int ifindex = ifmca->idev->dev->ifindex;
4299
4300 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4301 scope = RT_SCOPE_SITE;
1da177e4 4302
15e47304 4303 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4304 if (!nlh)
26932566 4305 return -EMSGSIZE;
85486af0 4306
0ab6803b 4307 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4308 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4309 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4310 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4311 nlmsg_cancel(skb, nlh);
4312 return -EMSGSIZE;
4313 }
85486af0 4314
053c095a
JB		 4315 nlmsg_end(skb, nlh);
4316 return 0;
1da177e4
LT		 4317}
4318
4319static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4320 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4321{
1da177e4 4322 struct nlmsghdr *nlh;
101bb229
TG		 4323 u8 scope = RT_SCOPE_UNIVERSE;
4324 int ifindex = ifaca->aca_idev->dev->ifindex;
4325
4326 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4327 scope = RT_SCOPE_SITE;
1da177e4 4328
15e47304 4329 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4330 if (!nlh)
26932566 4331 return -EMSGSIZE;
85486af0 4332
0ab6803b 4333 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4334 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4335 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4336 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4337 nlmsg_cancel(skb, nlh);
4338 return -EMSGSIZE;
4339 }
1da177e4 4340
053c095a
JB		 4341 nlmsg_end(skb, nlh);
4342 return 0;
1da177e4
LT		 4343}
4344
e21e8467 4345enum addr_type_t {
1da177e4
LT		 4346 UNICAST_ADDR,
4347 MULTICAST_ADDR,
4348 ANYCAST_ADDR,
4349};
4350
234b27c3
ED		 4351/* called with rcu_read_lock() */
4352static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4353 struct netlink_callback *cb, enum addr_type_t type,
4354 int s_ip_idx, int *p_ip_idx)
4355{
234b27c3
ED		 4356 struct ifmcaddr6 *ifmca;
4357 struct ifacaddr6 *ifaca;
4358 int err = 1;
4359 int ip_idx = *p_ip_idx;
4360
4361 read_lock_bh(&idev->lock);
4362 switch (type) {
502a2ffd 4363 case UNICAST_ADDR: {
4364 struct inet6_ifaddr *ifa;
4365
234b27c3 4366 /* unicast address incl. temp addr */
502a2ffd 4367 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4368 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4369 continue;
4370 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4371 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4372 cb->nlh->nlmsg_seq,
4373 RTM_NEWADDR,
4374 NLM_F_MULTI);
053c095a 4375 if (err < 0)
234b27c3 4376 break;
63998ac2 4377 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4378 }
4379 break;
502a2ffd 4380 }
234b27c3
ED		 4381 case MULTICAST_ADDR:
4382 /* multicast address */
4383 for (ifmca = idev->mc_list; ifmca;
4384 ifmca = ifmca->next, ip_idx++) {
4385 if (ip_idx < s_ip_idx)
4386 continue;
4387 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4388 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4389 cb->nlh->nlmsg_seq,
4390 RTM_GETMULTICAST,
4391 NLM_F_MULTI);
053c095a 4392 if (err < 0)
234b27c3
ED		 4393 break;
4394 }
4395 break;
4396 case ANYCAST_ADDR:
4397 /* anycast address */
4398 for (ifaca = idev->ac_list; ifaca;
4399 ifaca = ifaca->aca_next, ip_idx++) {
4400 if (ip_idx < s_ip_idx)
4401 continue;
4402 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4403 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4404 cb->nlh->nlmsg_seq,
4405 RTM_GETANYCAST,
4406 NLM_F_MULTI);
053c095a 4407 if (err < 0)
234b27c3
ED		 4408 break;
4409 }
4410 break;
4411 default:
4412 break;
4413 }
4414 read_unlock_bh(&idev->lock);
4415 *p_ip_idx = ip_idx;
4416 return err;
4417}
4418
1da177e4
LT		 4419static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4420 enum addr_type_t type)
4421{
234b27c3
ED		 4422 struct net *net = sock_net(skb->sk);
4423 int h, s_h;
1da177e4
LT		 4424 int idx, ip_idx;
4425 int s_idx, s_ip_idx;
1da177e4 4426 struct net_device *dev;
234b27c3
ED		 4427 struct inet6_dev *idev;
4428 struct hlist_head *head;
1ab1457c 4429
234b27c3
ED		 4430 s_h = cb->args[0];
4431 s_idx = idx = cb->args[1];
4432 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4433
234b27c3 4434 rcu_read_lock();
63998ac2 4435 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4436 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4437 idx = 0;
4438 head = &net->dev_index_head[h];
b67bfe0d 4439 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4440 if (idx < s_idx)
4441 goto cont;
4b97efdf 4442 if (h > s_h || idx > s_idx)
234b27c3
ED		 4443 s_ip_idx = 0;
4444 ip_idx = 0;
e21e8467
SH		 4445 idev = __in6_dev_get(dev);
4446 if (!idev)
234b27c3
ED		 4447 goto cont;
4448
4449 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4450 s_ip_idx, &ip_idx) < 0)
234b27c3 4451 goto done;
7562f876 4452cont:
234b27c3
ED		 4453 idx++;
4454 }
1da177e4 4455 }
234b27c3
ED		 4456done:
4457 rcu_read_unlock();
4458 cb->args[0] = h;
4459 cb->args[1] = idx;
4460 cb->args[2] = ip_idx;
4461
1da177e4
LT		 4462 return skb->len;
4463}
4464
4465static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4466{
4467 enum addr_type_t type = UNICAST_ADDR;
b854272b 4468
1da177e4
LT		 4469 return inet6_dump_addr(skb, cb, type);
4470}
4471
4472static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4473{
4474 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4475
1da177e4
LT		 4476 return inet6_dump_addr(skb, cb, type);
4477}
4478
4479
4480static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4481{
4482 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4483
1da177e4
LT		 4484 return inet6_dump_addr(skb, cb, type);
4485}
4486
661d2967 4487static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4488{
3b1e0a65 4489 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4490 struct ifaddrmsg *ifm;
4491 struct nlattr *tb[IFA_MAX+1];
caeaba79 4492 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4493 struct net_device *dev = NULL;
4494 struct inet6_ifaddr *ifa;
4495 struct sk_buff *skb;
6c223828
NT		 4496 int err;
4497
1b29fc2c
TG		 4498 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4499 if (err < 0)
4500 goto errout;
4501
caeaba79 4502 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
63159f29 4503 if (!addr) {
1b29fc2c
TG		 4504 err = -EINVAL;
4505 goto errout;
6c223828 4506 }
6c223828 4507
1b29fc2c 4508 ifm = nlmsg_data(nlh);
6c223828 4509 if (ifm->ifa_index)
6fda7350 4510 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4511
e21e8467
SH		 4512 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4513 if (!ifa) {
1b29fc2c
TG		 4514 err = -EADDRNOTAVAIL;
4515 goto errout;
4516 }
6c223828 4517
e21e8467
SH		 4518 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4519 if (!skb) {
6c223828 4520 err = -ENOBUFS;
1b29fc2c 4521 goto errout_ifa;
6c223828
NT		 4522 }
4523
15e47304 4524 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4525 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4526 if (err < 0) {
4527 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4528 WARN_ON(err == -EMSGSIZE);
4529 kfree_skb(skb);
4530 goto errout_ifa;
4531 }
15e47304 4532 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4533errout_ifa:
6c223828 4534 in6_ifa_put(ifa);
1b29fc2c 4535errout:
6c223828 4536 return err;
6c223828
NT		 4537}
4538
1da177e4
LT		 4539static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4540{
4541 struct sk_buff *skb;
c346dca1 4542 struct net *net = dev_net(ifa->idev->dev);
5d620266 4543 int err = -ENOBUFS;
1da177e4 4544
0ab6803b 4545 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 4546 if (!skb)
5d620266
TG		 4547 goto errout;
4548
4549 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4550 if (err < 0) {
4551 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4552 WARN_ON(err == -EMSGSIZE);
4553 kfree_skb(skb);
4554 goto errout;
4555 }
1ce85fe4
PNA		 4556 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4557 return;
5d620266
TG		 4558errout:
4559 if (err < 0)
6fda7350 4560 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4561}
4562
b6f99a21 4563static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4564 __s32 *array, int bytes)
4565{
04561c1f
TG		 4566 BUG_ON(bytes < (DEVCONF_MAX * 4));
4567
1da177e4
LT		 4568 memset(array, 0, bytes);
4569 array[DEVCONF_FORWARDING] = cnf->forwarding;
4570 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4571 array[DEVCONF_MTU6] = cnf->mtu6;
4572 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4573 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4574 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4575 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4576 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4577 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4578 jiffies_to_msecs(cnf->rtr_solicit_interval);
4579 array[DEVCONF_RTR_SOLICIT_DELAY] =
4580 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4581 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4582 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4583 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4584 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4585 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4586 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4587 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4588 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4589 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4590 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4591 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4592 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 4593 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 4594 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4595#ifdef CONFIG_IPV6_ROUTER_PREF
4596 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4597 array[DEVCONF_RTR_PROBE_INTERVAL] =
4598 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4599#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4600 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4601#endif
930d6ff2 4602#endif
fbea49e1 4603 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4604 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4605#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4606 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 4607 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 4608#endif
7bc570c8
YH		 4609#ifdef CONFIG_IPV6_MROUTE
4610 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4611#endif
778d80be 4612 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4613 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4614 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4615 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 4616 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 4617 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 4618 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
3d1bec99 4619 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 4620 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
1da177e4
LT		 4621}
4622
b382b191
TG		 4623static inline size_t inet6_ifla6_size(void)
4624{
4625 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4626 + nla_total_size(sizeof(struct ifla_cacheinfo))
4627 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4628 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4629 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4630 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4631}
4632
339bf98f
TG		 4633static inline size_t inet6_if_nlmsg_size(void)
4634{
4635 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4636 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4637 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4638 + nla_total_size(4) /* IFLA_MTU */
4639 + nla_total_size(4) /* IFLA_LINK */
b382b191 4640 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4641}
c5396a31 4642
be281e55 4643static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4644 int items, int bytes)
7f7d9a6b
HX		 4645{
4646 int i;
4647 int pad = bytes - sizeof(u64) * items;
4648 BUG_ON(pad < 0);
4649
4650 /* Use put_unaligned() because stats may not be aligned for u64. */
4651 put_unaligned(items, &stats[0]);
4652 for (i = 1; i < items; i++)
be281e55 4653 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4654
4655 memset(&stats[items], 0, pad);
4656}
4657
698365fa 4658static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4ce3c183
ED		 4659 int items, int bytes, size_t syncpoff)
4660{
4661 int i;
4662 int pad = bytes - sizeof(u64) * items;
4663 BUG_ON(pad < 0);
4664
4665 /* Use put_unaligned() because stats may not be aligned for u64. */
4666 put_unaligned(items, &stats[0]);
4667 for (i = 1; i < items; i++)
4668 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4669
4670 memset(&stats[items], 0, pad);
4671}
4672
7f7d9a6b
HX		 4673static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4674 int bytes)
4675{
e21e8467 4676 switch (attrtype) {
7f7d9a6b 4677 case IFLA_INET6_STATS:
698365fa 4678 __snmp6_fill_stats64(stats, idev->stats.ipv6,
4ce3c183 4679 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4680 break;
4681 case IFLA_INET6_ICMP6STATS:
be281e55 4682 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4683 break;
4684 }
4685}
4686
b382b191
TG		 4687static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4688{
4689 struct nlattr *nla;
4690 struct ifla_cacheinfo ci;
4691
c78679e8
DM		 4692 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4693 goto nla_put_failure;
b382b191 4694 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4695 ci.tstamp = cstamp_delta(idev->tstamp);
4696 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 4697 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 4698 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4699 goto nla_put_failure;
b382b191 4700 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 4701 if (!nla)
b382b191
TG		 4702 goto nla_put_failure;
4703 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4704
4705 /* XXX - MC not implemented */
4706
4707 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 4708 if (!nla)
b382b191
TG		 4709 goto nla_put_failure;
4710 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4711
4712 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 4713 if (!nla)
b382b191
TG		 4714 goto nla_put_failure;
4715 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4716
f53adae4 4717 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 4718 if (!nla)
f53adae4 4719 goto nla_put_failure;
bc91b0f0
JP		 4720
4721 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4722 goto nla_put_failure;
4723
f53adae4
DB		 4724 read_lock_bh(&idev->lock);
4725 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4726 read_unlock_bh(&idev->lock);
4727
b382b191
TG		 4728 return 0;
4729
4730nla_put_failure:
4731 return -EMSGSIZE;
4732}
4733
4734static size_t inet6_get_link_af_size(const struct net_device *dev)
4735{
4736 if (!__in6_dev_get(dev))
4737 return 0;
4738
4739 return inet6_ifla6_size();
4740}
4741
4742static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4743{
4744 struct inet6_dev *idev = __in6_dev_get(dev);
4745
4746 if (!idev)
4747 return -ENODATA;
4748
4749 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4750 return -EMSGSIZE;
4751
4752 return 0;
4753}
4754
f53adae4
DB		 4755static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4756{
f53adae4
DB		 4757 struct inet6_ifaddr *ifp;
4758 struct net_device *dev = idev->dev;
fc403832 4759 bool update_rs = false;
dc848292 4760 struct in6_addr ll_addr;
f53adae4 4761
c15b1cca
HFS		 4762 ASSERT_RTNL();
4763
63159f29 4764 if (!token)
f53adae4
DB		 4765 return -EINVAL;
4766 if (ipv6_addr_any(token))
4767 return -EINVAL;
4768 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4769 return -EINVAL;
f53adae4
DB		 4770 if (!ipv6_accept_ra(idev))
4771 return -EINVAL;
4772 if (idev->cnf.rtr_solicits <= 0)
4773 return -EINVAL;
4774
4775 write_lock_bh(&idev->lock);
4776
4777 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4778 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4779
4780 write_unlock_bh(&idev->lock);
4781
dc848292
HFS		 4782 if (!idev->dead && (idev->if_flags & IF_READY) &&
4783 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4784 IFA_F_OPTIMISTIC)) {
fc403832
DB		 4785
4786 /* If we're not ready, then normal ifup will take care
4787 * of this. Otherwise, we need to request our rs here.
4788 */
4789 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4790 update_rs = true;
4791 }
f53adae4
DB		 4792
4793 write_lock_bh(&idev->lock);
fc403832 4794
77ecaace 4795 if (update_rs) {
fc403832 4796 idev->if_flags |= IF_RS_SENT;
77ecaace
HFS		 4797 idev->rs_probes = 1;
4798 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4799 }
f53adae4
DB		 4800
4801 /* Well, that's kinda nasty ... */
4802 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4803 spin_lock(&ifp->lock);
617fe29d 4804 if (ifp->tokenized) {
f53adae4
DB		 4805 ifp->valid_lft = 0;
4806 ifp->prefered_lft = 0;
4807 }
4808 spin_unlock(&ifp->lock);
4809 }
4810
4811 write_unlock_bh(&idev->lock);
b2ed64a9 4812 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 4813 addrconf_verify_rtnl();
f53adae4
DB		 4814 return 0;
4815}
4816
11b1f828
DB		 4817static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4818 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
4819 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
4820};
4821
4822static int inet6_validate_link_af(const struct net_device *dev,
4823 const struct nlattr *nla)
4824{
4825 struct nlattr *tb[IFLA_INET6_MAX + 1];
4826
4827 if (dev && !__in6_dev_get(dev))
4828 return -EAFNOSUPPORT;
4829
4830 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4831}
4832
f53adae4
DB		 4833static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4834{
4835 int err = -EINVAL;
4836 struct inet6_dev *idev = __in6_dev_get(dev);
4837 struct nlattr *tb[IFLA_INET6_MAX + 1];
4838
4839 if (!idev)
4840 return -EAFNOSUPPORT;
4841
4842 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4843 BUG();
4844
bc91b0f0 4845 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 4846 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 4847 if (err)
4848 return err;
4849 }
4850
4851 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4852 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4853
4854 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
622c81d5
HFS		 4855 mode != IN6_ADDR_GEN_MODE_NONE &&
4856 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
4857 return -EINVAL;
4858
4859 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4860 !idev->cnf.stable_secret.initialized &&
4861 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
bc91b0f0 4862 return -EINVAL;
622c81d5 4863
bc91b0f0
JP		 4864 idev->addr_gen_mode = mode;
4865 err = 0;
4866 }
f53adae4
DB		 4867
4868 return err;
4869}
4870
1ab1457c 4871static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4872 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4873{
04561c1f 4874 struct net_device *dev = idev->dev;
04561c1f
TG		 4875 struct ifinfomsg *hdr;
4876 struct nlmsghdr *nlh;
4877 void *protoinfo;
04561c1f 4878
15e47304 4879 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 4880 if (!nlh)
26932566 4881 return -EMSGSIZE;
04561c1f
TG		 4882
4883 hdr = nlmsg_data(nlh);
4884 hdr->ifi_family = AF_INET6;
4885 hdr->__ifi_pad = 0;
4886 hdr->ifi_type = dev->type;
4887 hdr->ifi_index = dev->ifindex;
4888 hdr->ifi_flags = dev_get_flags(dev);
4889 hdr->ifi_change = 0;
4890
c78679e8
DM		 4891 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4892 (dev->addr_len &&
4893 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4894 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a
ND		 4895 (dev->ifindex != dev_get_iflink(dev) &&
4896 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
c78679e8 4897 goto nla_put_failure;
04561c1f 4898 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 4899 if (!protoinfo)
04561c1f 4900 goto nla_put_failure;
1da177e4 4901
b382b191 4902 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4903 goto nla_put_failure;
1da177e4 4904
04561c1f 4905 nla_nest_end(skb, protoinfo);
053c095a
JB		 4906 nlmsg_end(skb, nlh);
4907 return 0;
1da177e4 4908
04561c1f 4909nla_put_failure:
26932566
PM		 4910 nlmsg_cancel(skb, nlh);
4911 return -EMSGSIZE;
1da177e4
LT		 4912}
4913
4914static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4915{
3b1e0a65 4916 struct net *net = sock_net(skb->sk);
84d2697d 4917 int h, s_h;
434a8a58 4918 int idx = 0, s_idx;
1da177e4
LT		 4919 struct net_device *dev;
4920 struct inet6_dev *idev;
84d2697d 4921 struct hlist_head *head;
1da177e4 4922
84d2697d
ED		 4923 s_h = cb->args[0];
4924 s_idx = cb->args[1];
4925
4926 rcu_read_lock();
4927 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4928 idx = 0;
4929 head = &net->dev_index_head[h];
b67bfe0d 4930 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 4931 if (idx < s_idx)
4932 goto cont;
4933 idev = __in6_dev_get(dev);
4934 if (!idev)
4935 goto cont;
4936 if (inet6_fill_ifinfo(skb, idev,
15e47304 4937 NETLINK_CB(cb->skb).portid,
84d2697d 4938 cb->nlh->nlmsg_seq,
053c095a 4939 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 4940 goto out;
7562f876 4941cont:
84d2697d
ED		 4942 idx++;
4943 }
1da177e4 4944 }
84d2697d
ED		 4945out:
4946 rcu_read_unlock();
4947 cb->args[1] = idx;
4948 cb->args[0] = h;
1da177e4
LT		 4949
4950 return skb->len;
4951}
4952
4953void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4954{
4955 struct sk_buff *skb;
c346dca1 4956 struct net *net = dev_net(idev->dev);
8d7a76c9 4957 int err = -ENOBUFS;
1ab1457c 4958
339bf98f 4959 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 4960 if (!skb)
8d7a76c9
TG		 4961 goto errout;
4962
4963 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4964 if (err < 0) {
4965 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4966 WARN_ON(err == -EMSGSIZE);
4967 kfree_skb(skb);
4968 goto errout;
4969 }
5f75a104 4970 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4971 return;
8d7a76c9
TG		 4972errout:
4973 if (err < 0)
5f75a104 4974 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4975}
4976
339bf98f
TG		 4977static inline size_t inet6_prefix_nlmsg_size(void)
4978{
4979 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4980 + nla_total_size(sizeof(struct in6_addr))
4981 + nla_total_size(sizeof(struct prefix_cacheinfo));
4982}
c5396a31 4983
1da177e4 4984static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4985 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 4986 int event, unsigned int flags)
1da177e4 4987{
6051e2f4
TG		 4988 struct prefixmsg *pmsg;
4989 struct nlmsghdr *nlh;
1da177e4
LT		 4990 struct prefix_cacheinfo ci;
4991
15e47304 4992 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 4993 if (!nlh)
26932566 4994 return -EMSGSIZE;
6051e2f4
TG		 4995
4996 pmsg = nlmsg_data(nlh);
1da177e4 4997 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4998 pmsg->prefix_pad1 = 0;
4999 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5000 pmsg->prefix_ifindex = idev->dev->ifindex;
5001 pmsg->prefix_len = pinfo->prefix_len;
5002 pmsg->prefix_type = pinfo->type;
8a47077a 5003 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5004 pmsg->prefix_flags = 0;
5005 if (pinfo->onlink)
5006 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5007 if (pinfo->autoconf)
5008 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5009
c78679e8
DM		 5010 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5011 goto nla_put_failure;
1da177e4
LT		 5012 ci.preferred_time = ntohl(pinfo->prefered);
5013 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5014 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5015 goto nla_put_failure;
053c095a
JB		 5016 nlmsg_end(skb, nlh);
5017 return 0;
1da177e4 5018
6051e2f4 5019nla_put_failure:
26932566
PM		 5020 nlmsg_cancel(skb, nlh);
5021 return -EMSGSIZE;
1da177e4
LT		 5022}
5023
1ab1457c 5024static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5025 struct prefix_info *pinfo)
5026{
5027 struct sk_buff *skb;
c346dca1 5028 struct net *net = dev_net(idev->dev);
8c384bfa 5029 int err = -ENOBUFS;
1da177e4 5030
339bf98f 5031 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5032 if (!skb)
8c384bfa
TG		 5033 goto errout;
5034
5035 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5036 if (err < 0) {
5037 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5038 WARN_ON(err == -EMSGSIZE);
5039 kfree_skb(skb);
5040 goto errout;
5041 }
1ce85fe4
PNA		 5042 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5043 return;
8c384bfa
TG		 5044errout:
5045 if (err < 0)
6fda7350 5046 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5047}
5048
1da177e4
LT		 5049static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5050{
63998ac2
ND		 5051 struct net *net = dev_net(ifp->idev->dev);
5052
c15b1cca
HFS		 5053 if (event)
5054 ASSERT_RTNL();
5055
1da177e4
LT		 5056 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5057
5058 switch (event) {
5059 case RTM_NEWADDR:
95c385b4
NH		 5060 /*
5061 * If the address was optimistic
5062 * we inserted the route at the start of
5063 * our DAD process, so we don't need
5064 * to do it again
5065 */
5066 if (!(ifp->rt->rt6i_node))
5067 ip6_ins_rt(ifp->rt);
1da177e4
LT		 5068 if (ifp->idev->cnf.forwarding)
5069 addrconf_join_anycast(ifp);
7996c799 5070 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 5071 addrconf_prefix_route(&ifp->peer_addr, 128,
5072 ifp->idev->dev, 0, 0);
1da177e4
LT		 5073 break;
5074 case RTM_DELADDR:
5075 if (ifp->idev->cnf.forwarding)
5076 addrconf_leave_anycast(ifp);
5077 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5078 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 5079 struct rt6_info *rt;
caeaba79 5080
e7478dfc
ND		 5081 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5082 ifp->idev->dev, 0, 0);
f24062b0
ND		 5083 if (rt && ip6_del_rt(rt))
5084 dst_free(&rt->dst);
caeaba79 5085 }
d8d1f30b 5086 dst_hold(&ifp->rt->dst);
93fa159a 5087
73a8bd74 5088 if (ip6_del_rt(ifp->rt))
d8d1f30b 5089 dst_free(&ifp->rt->dst);
705f1c86
HFS		 5090
5091 rt_genid_bump_ipv6(net);
1da177e4
LT		 5092 break;
5093 }
63998ac2 5094 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5095}
5096
5097static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5098{
8814c4b5 5099 rcu_read_lock_bh();
1da177e4
LT		 5100 if (likely(ifp->idev->dead == 0))
5101 __ipv6_ifa_notify(event, ifp);
8814c4b5 5102 rcu_read_unlock_bh();
1da177e4
LT		 5103}
5104
5105#ifdef CONFIG_SYSCTL
5106
5107static
fe2c6338 5108int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5109 void __user *buffer, size_t *lenp, loff_t *ppos)
5110{
5111 int *valp = ctl->data;
5112 int val = *valp;
88af182e 5113 loff_t pos = *ppos;
fe2c6338 5114 struct ctl_table lctl;
1da177e4
LT		 5115 int ret;
5116
013d97e9
FR		 5117 /*
5118 * ctl->data points to idev->cnf.forwarding, we should
5119 * not modify it until we get the rtnl lock.
5120 */
5121 lctl = *ctl;
5122 lctl.data = &val;
5123
5124 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5125
c8fecf22 5126 if (write)
b325fddb 5127 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5128 if (ret)
5129 *ppos = pos;
1ab1457c 5130 return ret;
1da177e4
LT		 5131}
5132
77751427
ML		 5133static
5134int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5135 void __user *buffer, size_t *lenp, loff_t *ppos)
5136{
5137 struct inet6_dev *idev = ctl->extra1;
5138 int min_mtu = IPV6_MIN_MTU;
5139 struct ctl_table lctl;
5140
5141 lctl = *ctl;
5142 lctl.extra1 = &min_mtu;
5143 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5144
5145 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5146}
5147
56d417b1
BH		 5148static void dev_disable_change(struct inet6_dev *idev)
5149{
75538c2b
CW		 5150 struct netdev_notifier_info info;
5151
56d417b1
BH		 5152 if (!idev || !idev->dev)
5153 return;
5154
75538c2b 5155 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5156 if (idev->cnf.disable_ipv6)
75538c2b 5157 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5158 else
75538c2b 5159 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5160}
5161
5162static void addrconf_disable_change(struct net *net, __s32 newf)
5163{
5164 struct net_device *dev;
5165 struct inet6_dev *idev;
5166
c6d14c84
ED		 5167 rcu_read_lock();
5168 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 5169 idev = __in6_dev_get(dev);
5170 if (idev) {
5171 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5172 idev->cnf.disable_ipv6 = newf;
5173 if (changed)
5174 dev_disable_change(idev);
5175 }
56d417b1 5176 }
c6d14c84 5177 rcu_read_unlock();
56d417b1
BH		 5178}
5179
013d97e9 5180static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5181{
5182 struct net *net;
013d97e9
FR		 5183 int old;
5184
5185 if (!rtnl_trylock())
5186 return restart_syscall();
56d417b1
BH		 5187
5188 net = (struct net *)table->extra2;
013d97e9
FR		 5189 old = *p;
5190 *p = newf;
56d417b1 5191
013d97e9
FR		 5192 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5193 rtnl_unlock();
56d417b1 5194 return 0;
88af182e 5195 }
56d417b1
BH		 5196
5197 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5198 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5199 addrconf_disable_change(net, newf);
013d97e9 5200 } else if ((!newf) ^ (!old))
56d417b1
BH		 5201 dev_disable_change((struct inet6_dev *)table->extra1);
5202
5203 rtnl_unlock();
5204 return 0;
5205}
5206
5207static
fe2c6338 5208int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5209 void __user *buffer, size_t *lenp, loff_t *ppos)
5210{
5211 int *valp = ctl->data;
5212 int val = *valp;
88af182e 5213 loff_t pos = *ppos;
fe2c6338 5214 struct ctl_table lctl;
56d417b1
BH		 5215 int ret;
5216
013d97e9
FR		 5217 /*
5218 * ctl->data points to idev->cnf.disable_ipv6, we should
5219 * not modify it until we get the rtnl lock.
5220 */
5221 lctl = *ctl;
5222 lctl.data = &val;
5223
5224 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5225
5226 if (write)
5227 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5228 if (ret)
5229 *ppos = pos;
56d417b1
BH		 5230 return ret;
5231}
5232
c92d5491 5233static
5234int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5235 void __user *buffer, size_t *lenp, loff_t *ppos)
5236{
5237 int *valp = ctl->data;
5238 int ret;
5239 int old, new;
5240
5241 old = *valp;
5242 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5243 new = *valp;
5244
5245 if (write && old != new) {
5246 struct net *net = ctl->extra2;
5247
5248 if (!rtnl_trylock())
5249 return restart_syscall();
5250
5251 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5252 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5253 NETCONFA_IFINDEX_DEFAULT,
5254 net->ipv6.devconf_dflt);
5255 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5256 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5257 NETCONFA_IFINDEX_ALL,
5258 net->ipv6.devconf_all);
5259 else {
5260 struct inet6_dev *idev = ctl->extra1;
5261
5262 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5263 idev->dev->ifindex,
5264 &idev->cnf);
5265 }
5266 rtnl_unlock();
5267 }
5268
5269 return ret;
5270}
5271
3d1bec99
HFS		 5272static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5273 void __user *buffer, size_t *lenp,
5274 loff_t *ppos)
5275{
5276 int err;
5277 struct in6_addr addr;
5278 char str[IPV6_MAX_STRLEN];
5279 struct ctl_table lctl = *ctl;
622c81d5 5280 struct net *net = ctl->extra2;
3d1bec99
HFS		 5281 struct ipv6_stable_secret *secret = ctl->data;
5282
622c81d5
HFS		 5283 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5284 return -EIO;
5285
3d1bec99
HFS		 5286 lctl.maxlen = IPV6_MAX_STRLEN;
5287 lctl.data = str;
5288
5289 if (!rtnl_trylock())
5290 return restart_syscall();
5291
5292 if (!write && !secret->initialized) {
5293 err = -EIO;
5294 goto out;
5295 }
5296
5297 if (!write) {
5298 err = snprintf(str, sizeof(str), "%pI6",
5299 &secret->secret);
5300 if (err >= sizeof(str)) {
5301 err = -EIO;
5302 goto out;
5303 }
5304 }
5305
5306 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5307 if (err || !write)
5308 goto out;
5309
5310 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5311 err = -EIO;
5312 goto out;
5313 }
5314
5315 secret->initialized = true;
5316 secret->secret = addr;
5317
622c81d5
HFS		 5318 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5319 struct net_device *dev;
5320
5321 for_each_netdev(net, dev) {
5322 struct inet6_dev *idev = __in6_dev_get(dev);
5323
5324 if (idev) {
5325 idev->addr_gen_mode =
5326 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5327 }
5328 }
5329 } else {
5330 struct inet6_dev *idev = ctl->extra1;
5331
5332 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5333 }
5334
3d1bec99
HFS		 5335out:
5336 rtnl_unlock();
5337
5338 return err;
5339}
c92d5491 5340
1da177e4
LT		 5341static struct addrconf_sysctl_table
5342{
5343 struct ctl_table_header *sysctl_header;
fe2c6338 5344 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 5345} addrconf_sysctl __read_mostly = {
1da177e4
LT		 5346 .sysctl_header = NULL,
5347 .addrconf_vars = {
1ab1457c 5348 {
e21e8467
SH		 5349 .procname = "forwarding",
5350 .data = &ipv6_devconf.forwarding,
5351 .maxlen = sizeof(int),
5352 .mode = 0644,
5353 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 5354 },
5355 {
e21e8467
SH		 5356 .procname = "hop_limit",
5357 .data = &ipv6_devconf.hop_limit,
5358 .maxlen = sizeof(int),
5359 .mode = 0644,
5360 .proc_handler = proc_dointvec,
1da177e4
LT		 5361 },
5362 {
e21e8467
SH		 5363 .procname = "mtu",
5364 .data = &ipv6_devconf.mtu6,
5365 .maxlen = sizeof(int),
5366 .mode = 0644,
77751427 5367 .proc_handler = addrconf_sysctl_mtu,
1da177e4
LT		 5368 },
5369 {
e21e8467
SH		 5370 .procname = "accept_ra",
5371 .data = &ipv6_devconf.accept_ra,
5372 .maxlen = sizeof(int),
5373 .mode = 0644,
5374 .proc_handler = proc_dointvec,
1da177e4
LT		 5375 },
5376 {
e21e8467
SH		 5377 .procname = "accept_redirects",
5378 .data = &ipv6_devconf.accept_redirects,
5379 .maxlen = sizeof(int),
5380 .mode = 0644,
5381 .proc_handler = proc_dointvec,
1da177e4
LT		 5382 },
5383 {
e21e8467
SH		 5384 .procname = "autoconf",
5385 .data = &ipv6_devconf.autoconf,
5386 .maxlen = sizeof(int),
5387 .mode = 0644,
5388 .proc_handler = proc_dointvec,
1da177e4
LT		 5389 },
5390 {
e21e8467
SH		 5391 .procname = "dad_transmits",
5392 .data = &ipv6_devconf.dad_transmits,
5393 .maxlen = sizeof(int),
5394 .mode = 0644,
5395 .proc_handler = proc_dointvec,
1da177e4
LT		 5396 },
5397 {
e21e8467
SH		 5398 .procname = "router_solicitations",
5399 .data = &ipv6_devconf.rtr_solicits,
5400 .maxlen = sizeof(int),
5401 .mode = 0644,
5402 .proc_handler = proc_dointvec,
1da177e4
LT		 5403 },
5404 {
e21e8467
SH		 5405 .procname = "router_solicitation_interval",
5406 .data = &ipv6_devconf.rtr_solicit_interval,
5407 .maxlen = sizeof(int),
5408 .mode = 0644,
5409 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5410 },
5411 {
e21e8467
SH		 5412 .procname = "router_solicitation_delay",
5413 .data = &ipv6_devconf.rtr_solicit_delay,
5414 .maxlen = sizeof(int),
5415 .mode = 0644,
5416 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5417 },
5418 {
e21e8467
SH		 5419 .procname = "force_mld_version",
5420 .data = &ipv6_devconf.force_mld_version,
5421 .maxlen = sizeof(int),
5422 .mode = 0644,
5423 .proc_handler = proc_dointvec,
1da177e4 5424 },
fc4eba58
HFS		 5425 {
5426 .procname = "mldv1_unsolicited_report_interval",
5427 .data =
5428 &ipv6_devconf.mldv1_unsolicited_report_interval,
5429 .maxlen = sizeof(int),
5430 .mode = 0644,
5431 .proc_handler = proc_dointvec_ms_jiffies,
5432 },
5433 {
5434 .procname = "mldv2_unsolicited_report_interval",
5435 .data =
5436 &ipv6_devconf.mldv2_unsolicited_report_interval,
5437 .maxlen = sizeof(int),
5438 .mode = 0644,
5439 .proc_handler = proc_dointvec_ms_jiffies,
5440 },
1da177e4 5441 {
e21e8467
SH		 5442 .procname = "use_tempaddr",
5443 .data = &ipv6_devconf.use_tempaddr,
5444 .maxlen = sizeof(int),
5445 .mode = 0644,
5446 .proc_handler = proc_dointvec,
1da177e4
LT		 5447 },
5448 {
e21e8467
SH		 5449 .procname = "temp_valid_lft",
5450 .data = &ipv6_devconf.temp_valid_lft,
5451 .maxlen = sizeof(int),
5452 .mode = 0644,
5453 .proc_handler = proc_dointvec,
1da177e4
LT		 5454 },
5455 {
e21e8467
SH		 5456 .procname = "temp_prefered_lft",
5457 .data = &ipv6_devconf.temp_prefered_lft,
5458 .maxlen = sizeof(int),
5459 .mode = 0644,
5460 .proc_handler = proc_dointvec,
1da177e4
LT		 5461 },
5462 {
e21e8467
SH		 5463 .procname = "regen_max_retry",
5464 .data = &ipv6_devconf.regen_max_retry,
5465 .maxlen = sizeof(int),
5466 .mode = 0644,
5467 .proc_handler = proc_dointvec,
1da177e4
LT		 5468 },
5469 {
e21e8467
SH		 5470 .procname = "max_desync_factor",
5471 .data = &ipv6_devconf.max_desync_factor,
5472 .maxlen = sizeof(int),
5473 .mode = 0644,
5474 .proc_handler = proc_dointvec,
1da177e4 5475 },
1da177e4 5476 {
e21e8467
SH		 5477 .procname = "max_addresses",
5478 .data = &ipv6_devconf.max_addresses,
5479 .maxlen = sizeof(int),
5480 .mode = 0644,
5481 .proc_handler = proc_dointvec,
1da177e4 5482 },
65f5c7c1 5483 {
e21e8467
SH		 5484 .procname = "accept_ra_defrtr",
5485 .data = &ipv6_devconf.accept_ra_defrtr,
5486 .maxlen = sizeof(int),
5487 .mode = 0644,
5488 .proc_handler = proc_dointvec,
65f5c7c1 5489 },
8013d1d7
HL		 5490 {
5491 .procname = "accept_ra_min_hop_limit",
5492 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5493 .maxlen = sizeof(int),
5494 .mode = 0644,
5495 .proc_handler = proc_dointvec,
5496 },
c4fd30eb 5497 {
e21e8467
SH		 5498 .procname = "accept_ra_pinfo",
5499 .data = &ipv6_devconf.accept_ra_pinfo,
5500 .maxlen = sizeof(int),
5501 .mode = 0644,
5502 .proc_handler = proc_dointvec,
c4fd30eb 5503 },
930d6ff2
YH		 5504#ifdef CONFIG_IPV6_ROUTER_PREF
5505 {
e21e8467
SH		 5506 .procname = "accept_ra_rtr_pref",
5507 .data = &ipv6_devconf.accept_ra_rtr_pref,
5508 .maxlen = sizeof(int),
5509 .mode = 0644,
5510 .proc_handler = proc_dointvec,
930d6ff2 5511 },
52e16356 5512 {
e21e8467
SH		 5513 .procname = "router_probe_interval",
5514 .data = &ipv6_devconf.rtr_probe_interval,
5515 .maxlen = sizeof(int),
5516 .mode = 0644,
5517 .proc_handler = proc_dointvec_jiffies,
52e16356 5518 },
fa03ef38 5519#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 5520 {
e21e8467
SH		 5521 .procname = "accept_ra_rt_info_max_plen",
5522 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5523 .maxlen = sizeof(int),
5524 .mode = 0644,
5525 .proc_handler = proc_dointvec,
09c884d4
YH		 5526 },
5527#endif
930d6ff2 5528#endif
fbea49e1 5529 {
e21e8467
SH		 5530 .procname = "proxy_ndp",
5531 .data = &ipv6_devconf.proxy_ndp,
5532 .maxlen = sizeof(int),
5533 .mode = 0644,
c92d5491 5534 .proc_handler = addrconf_sysctl_proxy_ndp,
fbea49e1 5535 },
0bcbc926 5536 {
e21e8467
SH		 5537 .procname = "accept_source_route",
5538 .data = &ipv6_devconf.accept_source_route,
5539 .maxlen = sizeof(int),
5540 .mode = 0644,
5541 .proc_handler = proc_dointvec,
0bcbc926 5542 },
95c385b4
NH		 5543#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5544 {
e21e8467
SH		 5545 .procname = "optimistic_dad",
5546 .data = &ipv6_devconf.optimistic_dad,
5547 .maxlen = sizeof(int),
5548 .mode = 0644,
5549 .proc_handler = proc_dointvec,
95c385b4
NH		 5550
5551 },
7fd2561e
EK		 5552 {
5553 .procname = "use_optimistic",
5554 .data = &ipv6_devconf.use_optimistic,
5555 .maxlen = sizeof(int),
5556 .mode = 0644,
5557 .proc_handler = proc_dointvec,
5558
5559 },
7bc570c8
YH		 5560#endif
5561#ifdef CONFIG_IPV6_MROUTE
5562 {
e21e8467
SH		 5563 .procname = "mc_forwarding",
5564 .data = &ipv6_devconf.mc_forwarding,
5565 .maxlen = sizeof(int),
5566 .mode = 0444,
5567 .proc_handler = proc_dointvec,
7bc570c8 5568 },
95c385b4 5569#endif
778d80be 5570 {
e21e8467
SH		 5571 .procname = "disable_ipv6",
5572 .data = &ipv6_devconf.disable_ipv6,
5573 .maxlen = sizeof(int),
5574 .mode = 0644,
5575 .proc_handler = addrconf_sysctl_disable,
778d80be 5576 },
1b34be74 5577 {
e21e8467
SH		 5578 .procname = "accept_dad",
5579 .data = &ipv6_devconf.accept_dad,
5580 .maxlen = sizeof(int),
5581 .mode = 0644,
5582 .proc_handler = proc_dointvec,
1b34be74 5583 },
f7734fdf 5584 {
f7734fdf
OP		 5585 .procname = "force_tllao",
5586 .data = &ipv6_devconf.force_tllao,
5587 .maxlen = sizeof(int),
5588 .mode = 0644,
5589 .proc_handler = proc_dointvec
5590 },
5cb04436
HFS		 5591 {
5592 .procname = "ndisc_notify",
5593 .data = &ipv6_devconf.ndisc_notify,
5594 .maxlen = sizeof(int),
5595 .mode = 0644,
5596 .proc_handler = proc_dointvec
5597 },
b800c3b9
HFS		 5598 {
5599 .procname = "suppress_frag_ndisc",
5600 .data = &ipv6_devconf.suppress_frag_ndisc,
5601 .maxlen = sizeof(int),
5602 .mode = 0644,
5603 .proc_handler = proc_dointvec
5604 },
d9333196
BG		 5605 {
5606 .procname = "accept_ra_from_local",
5607 .data = &ipv6_devconf.accept_ra_from_local,
5608 .maxlen = sizeof(int),
5609 .mode = 0644,
5610 .proc_handler = proc_dointvec,
5611 },
c2943f14
HH		 5612 {
5613 .procname = "accept_ra_mtu",
5614 .data = &ipv6_devconf.accept_ra_mtu,
5615 .maxlen = sizeof(int),
5616 .mode = 0644,
5617 .proc_handler = proc_dointvec,
5618 },
3d1bec99
HFS		 5619 {
5620 .procname = "stable_secret",
5621 .data = &ipv6_devconf.stable_secret,
5622 .maxlen = IPV6_MAX_STRLEN,
5623 .mode = 0600,
5624 .proc_handler = addrconf_sysctl_stable_secret,
5625 },
3985e8a3
EK		 5626 {
5627 .procname = "use_oif_addrs_only",
5628 .data = &ipv6_devconf.use_oif_addrs_only,
5629 .maxlen = sizeof(int),
5630 .mode = 0644,
5631 .proc_handler = proc_dointvec,
5632
5633 },
1da177e4 5634 {
f8572d8f 5635 /* sentinel */
1da177e4
LT		 5636 }
5637 },
1da177e4
LT		 5638};
5639
bff16c2f 5640static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 5641 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 5642{
5643 int i;
1da177e4 5644 struct addrconf_sysctl_table *t;
6105e293 5645 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 5646
af879cc7 5647 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
63159f29 5648 if (!t)
f68635e6
PE		 5649 goto out;
5650
bcdd553f 5651 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 5652 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 5653 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 5654 t->addrconf_vars[i].extra2 = net;
1da177e4 5655 }
1da177e4 5656
6105e293 5657 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 5658
6105e293 5659 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
63159f29 5660 if (!t->sysctl_header)
6105e293 5661 goto free;
f68635e6
PE		 5662
5663 p->sysctl = t;
95897312 5664 return 0;
1da177e4 5665
f68635e6 5666free:
1da177e4 5667 kfree(t);
f68635e6 5668out:
95897312 5669 return -ENOBUFS;
1da177e4
LT		 5670}
5671
408c4768
PE		 5672static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5673{
5674 struct addrconf_sysctl_table *t;
5675
63159f29 5676 if (!p->sysctl)
408c4768
PE		 5677 return;
5678
5679 t = p->sysctl;
5680 p->sysctl = NULL;
ff538818 5681 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 5682 kfree(t);
5683}
5684
a317a2f1 5685static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 5686{
a317a2f1
WC		 5687 int err;
5688
5689 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5690 return -EINVAL;
5691
5692 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5693 &ndisc_ifinfo_sysctl_change);
5694 if (err)
5695 return err;
5696 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5697 idev, &idev->cnf);
5698 if (err)
5699 neigh_sysctl_unregister(idev->nd_parms);
5700
5701 return err;
f52295a9
PE		 5702}
5703
408c4768 5704static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 5705{
408c4768
PE		 5706 __addrconf_sysctl_unregister(&idev->cnf);
5707 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 5708}
5709
5710
5711#endif
5712
2c8c1e72 5713static int __net_init addrconf_init_net(struct net *net)
e0da5a48 5714{
a79ca223 5715 int err = -ENOMEM;
e0da5a48
PE		 5716 struct ipv6_devconf *all, *dflt;
5717
a79ca223 5718 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 5719 if (!all)
a79ca223 5720 goto err_alloc_all;
e0da5a48 5721
a79ca223 5722 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 5723 if (!dflt)
a79ca223 5724 goto err_alloc_dflt;
e0da5a48 5725
a79ca223
HZ		 5726 /* these will be inherited by all namespaces */
5727 dflt->autoconf = ipv6_defaults.autoconf;
5728 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 5729
3d1bec99
HFS		 5730 dflt->stable_secret.initialized = false;
5731 all->stable_secret.initialized = false;
5732
e0da5a48
PE		 5733 net->ipv6.devconf_all = all;
5734 net->ipv6.devconf_dflt = dflt;
5735
5736#ifdef CONFIG_SYSCTL
f8572d8f 5737 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 5738 if (err < 0)
5739 goto err_reg_all;
5740
f8572d8f 5741 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 5742 if (err < 0)
5743 goto err_reg_dflt;
5744#endif
5745 return 0;
5746
5747#ifdef CONFIG_SYSCTL
5748err_reg_dflt:
5749 __addrconf_sysctl_unregister(all);
5750err_reg_all:
5751 kfree(dflt);
5752#endif
5753err_alloc_dflt:
5754 kfree(all);
5755err_alloc_all:
5756 return err;
5757}
5758
2c8c1e72 5759static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 5760{
5761#ifdef CONFIG_SYSCTL
5762 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5763 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5764#endif
73cf0e92 5765 kfree(net->ipv6.devconf_dflt);
5766 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 5767}
5768
5769static struct pernet_operations addrconf_ops = {
5770 .init = addrconf_init_net,
5771 .exit = addrconf_exit_net,
5772};
5773
207895fd 5774static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 5775 .family = AF_INET6,
5776 .fill_link_af = inet6_fill_link_af,
5777 .get_link_af_size = inet6_get_link_af_size,
11b1f828 5778 .validate_link_af = inet6_validate_link_af,
f53adae4 5779 .set_link_af = inet6_set_link_af,
b382b191
TG		 5780};
5781
1da177e4
LT		 5782/*
5783 * Init / cleanup code
5784 */
5785
5786int __init addrconf_init(void)
5787{
a317a2f1 5788 struct inet6_dev *idev;
c2e21293 5789 int i, err;
2a8cc6c8 5790
e21e8467
SH		 5791 err = ipv6_addr_label_init();
5792 if (err < 0) {
f3213831
JP		 5793 pr_crit("%s: cannot initialize default policy table: %d\n",
5794 __func__, err);
2cc6d2bf 5795 goto out;
2a8cc6c8 5796 }
1da177e4 5797
2cc6d2bf
NH		 5798 err = register_pernet_subsys(&addrconf_ops);
5799 if (err < 0)
5800 goto out_addrlabel;
e0da5a48 5801
c15b1cca
HFS		 5802 addrconf_wq = create_workqueue("ipv6_addrconf");
5803 if (!addrconf_wq) {
5804 err = -ENOMEM;
5805 goto out_nowq;
5806 }
5807
1da177e4
LT		 5808 /* The addrconf netdev notifier requires that loopback_dev
5809 * has it's ipv6 private information allocated and setup
5810 * before it can bring up and give link-local addresses
5811 * to other devices which are up.
5812 *
5813 * Unfortunately, loopback_dev is not necessarily the first
5814 * entry in the global dev_base list of net devices. In fact,
5815 * it is likely to be the very last entry on that list.
5816 * So this causes the notifier registry below to try and
5817 * give link-local addresses to all devices besides loopback_dev
5818 * first, then loopback_dev, which cases all the non-loopback_dev
5819 * devices to fail to get a link-local address.
5820 *
5821 * So, as a temporary fix, allocate the ipv6 structure for
5822 * loopback_dev first by hand.
5823 * Longer term, all of the dependencies ipv6 has upon the loopback
5824 * device and it being up should be removed.
5825 */
5826 rtnl_lock();
a317a2f1 5827 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 5828 rtnl_unlock();
a317a2f1
WC		 5829 if (IS_ERR(idev)) {
5830 err = PTR_ERR(idev);
e0da5a48 5831 goto errlo;
a317a2f1 5832 }
1da177e4 5833
c2e21293 5834 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5835 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5836
1da177e4
LT		 5837 register_netdevice_notifier(&ipv6_dev_notf);
5838
c15b1cca 5839 addrconf_verify();
c127ea2c 5840
3678a9d8 5841 rtnl_af_register(&inet6_ops);
b382b191 5842
c7ac8679
GR		 5843 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5844 NULL);
c127ea2c
TG		 5845 if (err < 0)
5846 goto errout;
5847
5848 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 5849 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5850 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5851 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5852 inet6_dump_ifaddr, NULL);
5853 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5854 inet6_dump_ifmcaddr, NULL);
5855 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5856 inet6_dump_ifacaddr, NULL);
76f8f6cb 5857 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 5858 inet6_netconf_dump_devconf, NULL);
c127ea2c 5859
2a8cc6c8
YH		 5860 ipv6_addr_label_rtnl_register();
5861
1da177e4 5862 return 0;
c127ea2c 5863errout:
b382b191 5864 rtnl_af_unregister(&inet6_ops);
c127ea2c 5865 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5866errlo:
c15b1cca
HFS		 5867 destroy_workqueue(addrconf_wq);
5868out_nowq:
e0da5a48 5869 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 5870out_addrlabel:
5871 ipv6_addr_label_cleanup();
5872out:
c127ea2c 5873 return err;
1da177e4
LT		 5874}
5875
09f7709f 5876void addrconf_cleanup(void)
1da177e4 5877{
176c39af 5878 struct net_device *dev;
1da177e4
LT		 5879 int i;
5880
5881 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5882 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 5883 ipv6_addr_label_cleanup();
1da177e4
LT		 5884
5885 rtnl_lock();
5886
b382b191
TG		 5887 __rtnl_af_unregister(&inet6_ops);
5888
176c39af
DL		 5889 /* clean dev list */
5890 for_each_netdev(&init_net, dev) {
5891 if (__in6_dev_get(dev) == NULL)
5892 continue;
5893 addrconf_ifdown(dev, 1);
5894 }
5895 addrconf_ifdown(init_net.loopback_dev, 2);
5896
1da177e4
LT		 5897 /*
5898 * Check hash table.
5899 */
5c578aed 5900 spin_lock_bh(&addrconf_hash_lock);
c2e21293 5901 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5902 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 5903 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 5904 cancel_delayed_work(&addr_chk_work);
1da177e4 5905 rtnl_unlock();
c15b1cca
HFS		 5906
5907 destroy_workqueue(addrconf_wq);
1da177e4 5908}
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