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isdn: hisax: remove some dead code
[linux-2.6-block.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <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
LT		 48#include <linux/net.h>
49#include <linux/in6.h>
50#include <linux/netdevice.h>
1823730f 51#include <linux/if_addr.h>
1da177e4
LT		 52#include <linux/if_arp.h>
53#include <linux/if_arcnet.h>
54#include <linux/if_infiniband.h>
55#include <linux/route.h>
56#include <linux/inetdevice.h>
57#include <linux/init.h>
5a0e3ad6 58#include <linux/slab.h>
1da177e4
LT		 59#ifdef CONFIG_SYSCTL
60#include <linux/sysctl.h>
61#endif
4fc268d2 62#include <linux/capability.h>
1da177e4
LT		 63#include <linux/delay.h>
64#include <linux/notifier.h>
543537bd 65#include <linux/string.h>
ddbe5032 66#include <linux/hash.h>
1da177e4 67
457c4cbc 68#include <net/net_namespace.h>
1da177e4
LT		 69#include <net/sock.h>
70#include <net/snmp.h>
71
06a4c1c5 72#include <net/af_ieee802154.h>
cb6bf355 73#include <net/firewire.h>
1da177e4
LT		 74#include <net/ipv6.h>
75#include <net/protocol.h>
76#include <net/ndisc.h>
77#include <net/ip6_route.h>
78#include <net/addrconf.h>
79#include <net/tcp.h>
80#include <net/ip.h>
5d620266 81#include <net/netlink.h>
f24e3d65 82#include <net/pkt_sched.h>
1da177e4
LT		 83#include <linux/if_tunnel.h>
84#include <linux/rtnetlink.h>
f3a1bfb1 85#include <linux/netconf.h>
1da177e4 86#include <linux/random.h>
e21e8467 87#include <linux/uaccess.h>
7f7d9a6b 88#include <asm/unaligned.h>
1da177e4
LT		 89
90#include <linux/proc_fs.h>
91#include <linux/seq_file.h>
bc3b2d7f 92#include <linux/export.h>
1da177e4
LT		 93
94/* Set to 3 to get tracing... */
95#define ACONF_DEBUG 2
96
97#if ACONF_DEBUG >= 3
ba3542e1 98#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
1da177e4 99#else
ba3542e1 100#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
1da177e4
LT		 101#endif
102
103#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e
TG		 104
105static inline u32 cstamp_delta(unsigned long cstamp)
106{
107 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
108}
1da177e4
LT		 109
110#ifdef CONFIG_SYSCTL
f52295a9 111static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 112static void addrconf_sysctl_unregister(struct inet6_dev *idev);
113#else
114static inline void addrconf_sysctl_register(struct inet6_dev *idev)
115{
116}
117
118static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
119{
120}
1da177e4
LT		 121#endif
122
eb7e0575
SD		 123static void __ipv6_regen_rndid(struct inet6_dev *idev);
124static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 125static void ipv6_regen_rndid(unsigned long data);
1da177e4 126
1b34be74 127static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 128static int ipv6_count_addresses(struct inet6_dev *idev);
129
130/*
131 * Configured unicast address hash table
132 */
c2e21293 133static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 134static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 135
c15b1cca
HFS		 136static void addrconf_verify(void);
137static void addrconf_verify_rtnl(void);
138static void addrconf_verify_work(struct work_struct *);
1da177e4 139
c15b1cca
HFS		 140static struct workqueue_struct *addrconf_wq;
141static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 142
143static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
144static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
145
93d9b7d7
JP		 146static void addrconf_type_change(struct net_device *dev,
147 unsigned long event);
1da177e4
LT		 148static int addrconf_ifdown(struct net_device *dev, int how);
149
21caa662
RK		 150static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
151 int plen,
152 const struct net_device *dev,
153 u32 flags, u32 noflags);
154
cf22f9a2 155static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 156static void addrconf_dad_work(struct work_struct *w);
1da177e4 157static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 158static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 159static void addrconf_rs_timer(unsigned long data);
160static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
161static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
162
1ab1457c 163static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 164 struct prefix_info *pinfo);
3e81c6da
DM		 165static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
166 struct net_device *dev);
1da177e4 167
888c848e 168static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 169 .forwarding = 0,
170 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
171 .mtu6 = IPV6_MIN_MTU,
172 .accept_ra = 1,
173 .accept_redirects = 1,
174 .autoconf = 1,
175 .force_mld_version = 0,
fc4eba58
HFS		 176 .mldv1_unsolicited_report_interval = 10 * HZ,
177 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 178 .dad_transmits = 1,
179 .rtr_solicits = MAX_RTR_SOLICITATIONS,
180 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
181 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 182 .use_tempaddr = 0,
183 .temp_valid_lft = TEMP_VALID_LIFETIME,
184 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
185 .regen_max_retry = REGEN_MAX_RETRY,
186 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 187 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 188 .accept_ra_defrtr = 1,
c4fd30eb 189 .accept_ra_pinfo = 1,
930d6ff2
YH		 190#ifdef CONFIG_IPV6_ROUTER_PREF
191 .accept_ra_rtr_pref = 1,
52e16356 192 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 193#ifdef CONFIG_IPV6_ROUTE_INFO
194 .accept_ra_rt_info_max_plen = 0,
195#endif
930d6ff2 196#endif
fbea49e1 197 .proxy_ndp = 0,
0bcbc926 198 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 199 .disable_ipv6 = 0,
1b34be74 200 .accept_dad = 1,
b800c3b9 201 .suppress_frag_ndisc = 1,
1da177e4
LT		 202};
203
ab32ea5d 204static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 205 .forwarding = 0,
206 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
207 .mtu6 = IPV6_MIN_MTU,
208 .accept_ra = 1,
209 .accept_redirects = 1,
210 .autoconf = 1,
fc4eba58
HFS		 211 .force_mld_version = 0,
212 .mldv1_unsolicited_report_interval = 10 * HZ,
213 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 214 .dad_transmits = 1,
215 .rtr_solicits = MAX_RTR_SOLICITATIONS,
216 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
217 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 218 .use_tempaddr = 0,
219 .temp_valid_lft = TEMP_VALID_LIFETIME,
220 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
221 .regen_max_retry = REGEN_MAX_RETRY,
222 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 223 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 224 .accept_ra_defrtr = 1,
c4fd30eb 225 .accept_ra_pinfo = 1,
930d6ff2
YH		 226#ifdef CONFIG_IPV6_ROUTER_PREF
227 .accept_ra_rtr_pref = 1,
52e16356 228 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 229#ifdef CONFIG_IPV6_ROUTE_INFO
230 .accept_ra_rt_info_max_plen = 0,
231#endif
930d6ff2 232#endif
fbea49e1 233 .proxy_ndp = 0,
0bcbc926 234 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 235 .disable_ipv6 = 0,
1b34be74 236 .accept_dad = 1,
b800c3b9 237 .suppress_frag_ndisc = 1,
1da177e4
LT		 238};
239
f24e3d65 240/* Check if a valid qdisc is available */
05297949 241static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 242{
05297949 243 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 244}
245
b7b1bfce 246static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 247{
b7b1bfce
HFS		 248 if (del_timer(&idev->rs_timer))
249 __in6_dev_put(idev);
250}
251
c15b1cca 252static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 253{
c15b1cca 254 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 255 __in6_ifa_put(ifp);
256}
257
b7b1bfce
HFS		 258static void addrconf_mod_rs_timer(struct inet6_dev *idev,
259 unsigned long when)
260{
261 if (!timer_pending(&idev->rs_timer))
262 in6_dev_hold(idev);
263 mod_timer(&idev->rs_timer, jiffies + when);
264}
1da177e4 265
c15b1cca
HFS		 266static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
267 unsigned long delay)
1da177e4 268{
c15b1cca 269 if (!delayed_work_pending(&ifp->dad_work))
1da177e4 270 in6_ifa_hold(ifp);
c15b1cca 271 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
1da177e4
LT		 272}
273
7f7d9a6b
HX		 274static int snmp6_alloc_dev(struct inet6_dev *idev)
275{
827da44c
JS		 276 int i;
277
7d720c3e 278 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
1823e4c8
ED		 279 sizeof(struct ipstats_mib),
280 __alignof__(struct ipstats_mib)) < 0)
7f7d9a6b 281 goto err_ip;
827da44c
JS		 282
283 for_each_possible_cpu(i) {
284 struct ipstats_mib *addrconf_stats;
285 addrconf_stats = per_cpu_ptr(idev->stats.ipv6[0], i);
286 u64_stats_init(&addrconf_stats->syncp);
287#if SNMP_ARRAY_SZ == 2
288 addrconf_stats = per_cpu_ptr(idev->stats.ipv6[1], i);
289 u64_stats_init(&addrconf_stats->syncp);
290#endif
291 }
292
293
be281e55
ED		 294 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
295 GFP_KERNEL);
296 if (!idev->stats.icmpv6dev)
7f7d9a6b 297 goto err_icmp;
be281e55
ED		 298 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
299 GFP_KERNEL);
300 if (!idev->stats.icmpv6msgdev)
14878f75 301 goto err_icmpmsg;
7f7d9a6b
HX		 302
303 return 0;
304
14878f75 305err_icmpmsg:
be281e55 306 kfree(idev->stats.icmpv6dev);
7f7d9a6b 307err_icmp:
7d720c3e 308 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b 309err_ip:
aaf70ec7 310 return -ENOMEM;
7f7d9a6b
HX		 311}
312
8e5e8f30 313static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 314{
315 struct inet6_dev *ndev;
316
317 ASSERT_RTNL();
318
319 if (dev->mtu < IPV6_MIN_MTU)
320 return NULL;
321
1ab1457c 322 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 323
1ab1457c
YH		 324 if (ndev == NULL)
325 return NULL;
322f74a4
IO		 326
327 rwlock_init(&ndev->lock);
328 ndev->dev = dev;
502a2ffd 329 INIT_LIST_HEAD(&ndev->addr_list);
b7b1bfce
HFS		 330 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
331 (unsigned long)ndev);
c346dca1 332 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 333 ndev->cnf.mtu6 = dev->mtu;
334 ndev->cnf.sysctl = NULL;
335 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
336 if (ndev->nd_parms == NULL) {
337 kfree(ndev);
338 return NULL;
339 }
0187bdfb
BH		 340 if (ndev->cnf.forwarding)
341 dev_disable_lro(dev);
322f74a4
IO		 342 /* We refer to the device */
343 dev_hold(dev);
1da177e4 344
322f74a4 345 if (snmp6_alloc_dev(ndev) < 0) {
ba3542e1 346 ADBG(KERN_WARNING
f3213831 347 "%s: cannot allocate memory for statistics; dev=%s.\n",
ba3542e1 348 __func__, dev->name);
322f74a4 349 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 350 dev_put(dev);
351 kfree(ndev);
322f74a4
IO		 352 return NULL;
353 }
1da177e4 354
322f74a4 355 if (snmp6_register_dev(ndev) < 0) {
ba3542e1 356 ADBG(KERN_WARNING
f3213831 357 "%s: cannot create /proc/net/dev_snmp6/%s\n",
ba3542e1 358 __func__, dev->name);
322f74a4
IO		 359 neigh_parms_release(&nd_tbl, ndev->nd_parms);
360 ndev->dead = 1;
361 in6_dev_finish_destroy(ndev);
362 return NULL;
363 }
364
365 /* One reference from device. We must do this before
366 * we invoke __ipv6_regen_rndid().
367 */
368 in6_dev_hold(ndev);
1da177e4 369
1b34be74
YH		 370 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
371 ndev->cnf.accept_dad = -1;
372
07a93626 373#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 374 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 375 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 376 ndev->cnf.rtr_solicits = 0;
377 }
378#endif
379
372e6c8f 380 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 381 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 382 if ((dev->flags&IFF_LOOPBACK) ||
383 dev->type == ARPHRD_TUNNEL ||
9625ed72 384 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 385 dev->type == ARPHRD_SIT ||
0be669bb 386 dev->type == ARPHRD_NONE) {
322f74a4
IO		 387 ndev->cnf.use_tempaddr = -1;
388 } else {
389 in6_dev_hold(ndev);
390 ipv6_regen_rndid((unsigned long) ndev);
391 }
5d9efa7e 392
914faa14 393 ndev->token = in6addr_any;
1da177e4 394
f24e3d65 395 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 396 ndev->if_flags |= IF_READY;
397
322f74a4
IO		 398 ipv6_mc_init_dev(ndev);
399 ndev->tstamp = jiffies;
f52295a9 400 addrconf_sysctl_register(ndev);
30c4cf57 401 /* protected by rtnl_lock */
cf778b00 402 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 403
2c5e8933
HFS		 404 /* Join interface-local all-node multicast group */
405 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
406
d88ae4cc 407 /* Join all-node multicast group */
f3ee4010 408 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 409
d6ddef9e 410 /* Join all-router multicast group if forwarding is set */
8b2aaede 411 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 412 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
413
1da177e4
LT		 414 return ndev;
415}
416
8e5e8f30 417static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 418{
419 struct inet6_dev *idev;
420
421 ASSERT_RTNL();
422
e21e8467
SH		 423 idev = __in6_dev_get(dev);
424 if (!idev) {
425 idev = ipv6_add_dev(dev);
426 if (!idev)
1da177e4
LT		 427 return NULL;
428 }
c5e33bdd 429
1da177e4
LT		 430 if (dev->flags&IFF_UP)
431 ipv6_mc_up(idev);
432 return idev;
433}
434
f3a1bfb1
ND		 435static int inet6_netconf_msgsize_devconf(int type)
436{
437 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
438 + nla_total_size(4); /* NETCONFA_IFINDEX */
439
76f8f6cb
ND		 440 /* type -1 is used for ALL */
441 if (type == -1 || type == NETCONFA_FORWARDING)
f3a1bfb1 442 size += nla_total_size(4);
b1afce95 443#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 444 if (type == -1 || type == NETCONFA_MC_FORWARDING)
445 size += nla_total_size(4);
b1afce95 446#endif
c92d5491 447 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
448 size += nla_total_size(4);
f3a1bfb1
ND		 449
450 return size;
451}
452
453static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
454 struct ipv6_devconf *devconf, u32 portid,
455 u32 seq, int event, unsigned int flags,
456 int type)
457{
458 struct nlmsghdr *nlh;
459 struct netconfmsg *ncm;
460
461 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
462 flags);
463 if (nlh == NULL)
464 return -EMSGSIZE;
465
466 ncm = nlmsg_data(nlh);
467 ncm->ncm_family = AF_INET6;
468
469 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
470 goto nla_put_failure;
471
76f8f6cb
ND		 472 /* type -1 is used for ALL */
473 if ((type == -1 || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 474 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
475 goto nla_put_failure;
b1afce95 476#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 477 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
478 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
479 devconf->mc_forwarding) < 0)
480 goto nla_put_failure;
b1afce95 481#endif
c92d5491 482 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
483 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
484 goto nla_put_failure;
485
f3a1bfb1
ND		 486 return nlmsg_end(skb, nlh);
487
488nla_put_failure:
489 nlmsg_cancel(skb, nlh);
490 return -EMSGSIZE;
491}
492
d67b8c61
ND		 493void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
494 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 495{
496 struct sk_buff *skb;
497 int err = -ENOBUFS;
498
499 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
500 if (skb == NULL)
501 goto errout;
502
503 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
504 RTM_NEWNETCONF, 0, type);
505 if (err < 0) {
506 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
507 WARN_ON(err == -EMSGSIZE);
508 kfree_skb(skb);
509 goto errout;
510 }
511 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
512 return;
513errout:
bd779028 514 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 515}
516
76f8f6cb
ND		 517static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
518 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
519 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 520 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
76f8f6cb
ND		 521};
522
523static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 524 struct nlmsghdr *nlh)
76f8f6cb
ND		 525{
526 struct net *net = sock_net(in_skb->sk);
527 struct nlattr *tb[NETCONFA_MAX+1];
528 struct netconfmsg *ncm;
529 struct sk_buff *skb;
530 struct ipv6_devconf *devconf;
531 struct inet6_dev *in6_dev;
532 struct net_device *dev;
533 int ifindex;
534 int err;
535
536 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
537 devconf_ipv6_policy);
538 if (err < 0)
539 goto errout;
540
541 err = EINVAL;
542 if (!tb[NETCONFA_IFINDEX])
543 goto errout;
544
545 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
546 switch (ifindex) {
547 case NETCONFA_IFINDEX_ALL:
548 devconf = net->ipv6.devconf_all;
549 break;
550 case NETCONFA_IFINDEX_DEFAULT:
551 devconf = net->ipv6.devconf_dflt;
552 break;
553 default:
554 dev = __dev_get_by_index(net, ifindex);
555 if (dev == NULL)
556 goto errout;
557 in6_dev = __in6_dev_get(dev);
558 if (in6_dev == NULL)
559 goto errout;
560 devconf = &in6_dev->cnf;
561 break;
562 }
563
564 err = -ENOBUFS;
565 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
566 if (skb == NULL)
567 goto errout;
568
569 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
570 NETLINK_CB(in_skb).portid,
571 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
572 -1);
573 if (err < 0) {
574 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
575 WARN_ON(err == -EMSGSIZE);
576 kfree_skb(skb);
577 goto errout;
578 }
579 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
580errout:
581 return err;
582}
583
7a674200
ND		 584static int inet6_netconf_dump_devconf(struct sk_buff *skb,
585 struct netlink_callback *cb)
586{
587 struct net *net = sock_net(skb->sk);
588 int h, s_h;
589 int idx, s_idx;
590 struct net_device *dev;
591 struct inet6_dev *idev;
592 struct hlist_head *head;
593
594 s_h = cb->args[0];
595 s_idx = idx = cb->args[1];
596
597 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
598 idx = 0;
599 head = &net->dev_index_head[h];
600 rcu_read_lock();
63998ac2
ND		 601 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
602 net->dev_base_seq;
7a674200
ND		 603 hlist_for_each_entry_rcu(dev, head, index_hlist) {
604 if (idx < s_idx)
605 goto cont;
606 idev = __in6_dev_get(dev);
607 if (!idev)
608 goto cont;
609
610 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
611 &idev->cnf,
612 NETLINK_CB(cb->skb).portid,
613 cb->nlh->nlmsg_seq,
614 RTM_NEWNETCONF,
615 NLM_F_MULTI,
616 -1) <= 0) {
617 rcu_read_unlock();
618 goto done;
619 }
63998ac2 620 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 621cont:
622 idx++;
623 }
624 rcu_read_unlock();
625 }
626 if (h == NETDEV_HASHENTRIES) {
627 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
628 net->ipv6.devconf_all,
629 NETLINK_CB(cb->skb).portid,
630 cb->nlh->nlmsg_seq,
631 RTM_NEWNETCONF, NLM_F_MULTI,
632 -1) <= 0)
633 goto done;
634 else
635 h++;
636 }
637 if (h == NETDEV_HASHENTRIES + 1) {
638 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
639 net->ipv6.devconf_dflt,
640 NETLINK_CB(cb->skb).portid,
641 cb->nlh->nlmsg_seq,
642 RTM_NEWNETCONF, NLM_F_MULTI,
643 -1) <= 0)
644 goto done;
645 else
646 h++;
647 }
648done:
649 cb->args[0] = h;
650 cb->args[1] = idx;
651
652 return skb->len;
653}
654
1da177e4
LT		 655#ifdef CONFIG_SYSCTL
656static void dev_forward_change(struct inet6_dev *idev)
657{
658 struct net_device *dev;
659 struct inet6_ifaddr *ifa;
1da177e4
LT		 660
661 if (!idev)
662 return;
663 dev = idev->dev;
0187bdfb
BH		 664 if (idev->cnf.forwarding)
665 dev_disable_lro(dev);
1a940835 666 if (dev->flags & IFF_MULTICAST) {
2c5e8933 667 if (idev->cnf.forwarding) {
f3ee4010 668 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 669 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
670 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
671 } else {
f3ee4010 672 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 673 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
674 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
675 }
1da177e4 676 }
502a2ffd 677
678 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 679 if (ifa->flags&IFA_F_TENTATIVE)
680 continue;
1da177e4
LT		 681 if (idev->cnf.forwarding)
682 addrconf_join_anycast(ifa);
683 else
684 addrconf_leave_anycast(ifa);
685 }
f3a1bfb1
ND		 686 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
687 dev->ifindex, &idev->cnf);
1da177e4
LT		 688}
689
690
e186932b 691static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 692{
693 struct net_device *dev;
694 struct inet6_dev *idev;
695
4acd4945 696 for_each_netdev(net, dev) {
1da177e4
LT		 697 idev = __in6_dev_get(dev);
698 if (idev) {
e186932b
PE		 699 int changed = (!idev->cnf.forwarding) ^ (!newf);
700 idev->cnf.forwarding = newf;
1da177e4
LT		 701 if (changed)
702 dev_forward_change(idev);
703 }
1da177e4 704 }
1da177e4 705}
c8fecf22 706
013d97e9 707static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 708{
bff16c2f 709 struct net *net;
013d97e9
FR		 710 int old;
711
712 if (!rtnl_trylock())
713 return restart_syscall();
bff16c2f
PE		 714
715 net = (struct net *)table->extra2;
013d97e9
FR		 716 old = *p;
717 *p = newf;
b325fddb 718
013d97e9 719 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 720 if ((!newf) ^ (!old))
721 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
722 NETCONFA_IFINDEX_DEFAULT,
723 net->ipv6.devconf_dflt);
013d97e9
FR		 724 rtnl_unlock();
725 return 0;
88af182e 726 }
c8fecf22 727
e186932b 728 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 729 net->ipv6.devconf_dflt->forwarding = newf;
730 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 731 if ((!newf) ^ (!old))
732 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
733 NETCONFA_IFINDEX_ALL,
734 net->ipv6.devconf_all);
013d97e9 735 } else if ((!newf) ^ (!old))
c8fecf22 736 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 737 rtnl_unlock();
c8fecf22 738
013d97e9 739 if (newf)
7b4da532 740 rt6_purge_dflt_routers(net);
b325fddb 741 return 1;
c8fecf22 742}
1da177e4
LT		 743#endif
744
5c578aed 745/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 746void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
747{
c2e21293 748 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 749
1da177e4 750#ifdef NET_REFCNT_DEBUG
91df42be 751 pr_debug("%s\n", __func__);
1da177e4
LT		 752#endif
753
754 in6_dev_put(ifp->idev);
755
c15b1cca
HFS		 756 if (cancel_delayed_work(&ifp->dad_work))
757 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
758 ifp);
1da177e4 759
e9d3e084 760 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 761 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 762 return;
763 }
94e187c0 764 ip6_rt_put(ifp->rt);
1da177e4 765
e5785985 766 kfree_rcu(ifp, rcu);
1da177e4
LT		 767}
768
e55ffac6
BH		 769static void
770ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
771{
502a2ffd 772 struct list_head *p;
8a6ce0c0 773 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 774
775 /*
776 * Each device address list is sorted in order of scope -
777 * global before linklocal.
778 */
502a2ffd 779 list_for_each(p, &idev->addr_list) {
780 struct inet6_ifaddr *ifa
781 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 782 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 783 break;
784 }
785
b54c9b98 786 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 787}
788
ddbe5032 789static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 790{
ddbe5032 791 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 792}
793
1da177e4
LT		 794/* On success it returns ifp with increased reference count */
795
796static struct inet6_ifaddr *
3f8f5298
JP		 797ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
798 const struct in6_addr *peer_addr, int pfxlen,
8a226b2c 799 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
1da177e4
LT		 800{
801 struct inet6_ifaddr *ifa = NULL;
802 struct rt6_info *rt;
3a88a81d 803 unsigned int hash;
1da177e4 804 int err = 0;
d68b8270
YH		 805 int addr_type = ipv6_addr_type(addr);
806
807 if (addr_type == IPV6_ADDR_ANY ||
808 addr_type & IPV6_ADDR_MULTICAST ||
809 (!(idev->dev->flags & IFF_LOOPBACK) &&
810 addr_type & IPV6_ADDR_LOOPBACK))
811 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 812
8814c4b5 813 rcu_read_lock_bh();
1da177e4
LT		 814 if (idev->dead) {
815 err = -ENODEV; /*XXX*/
816 goto out2;
817 }
818
56d417b1 819 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 820 err = -EACCES;
821 goto out2;
822 }
823
5c578aed 824 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 825
826 /* Ignore adding duplicate addresses on an interface */
c346dca1 827 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ba3542e1 828 ADBG("ipv6_add_addr: already assigned\n");
1da177e4
LT		 829 err = -EEXIST;
830 goto out;
831 }
832
322f74a4 833 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 834
835 if (ifa == NULL) {
ba3542e1 836 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 837 err = -ENOBUFS;
838 goto out;
839 }
840
8f031519 841 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 842 if (IS_ERR(rt)) {
843 err = PTR_ERR(rt);
844 goto out;
845 }
846
bba24896
JP		 847 neigh_parms_data_state_setall(idev->nd_parms);
848
4e3fd7a0 849 ifa->addr = *addr;
3f8f5298
JP		 850 if (peer_addr)
851 ifa->peer_addr = *peer_addr;
1da177e4
LT		 852
853 spin_lock_init(&ifa->lock);
e9d3e084 854 spin_lock_init(&ifa->state_lock);
c15b1cca 855 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 856 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 857 ifa->scope = scope;
858 ifa->prefix_len = pfxlen;
859 ifa->flags = flags | IFA_F_TENTATIVE;
8a226b2c
JB		 860 ifa->valid_lft = valid_lft;
861 ifa->prefered_lft = prefered_lft;
1da177e4 862 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 863 ifa->tokenized = false;
1da177e4 864
57f5f544
KF		 865 ifa->rt = rt;
866
1da177e4
LT		 867 ifa->idev = idev;
868 in6_dev_hold(idev);
869 /* For caller */
870 in6_ifa_hold(ifa);
871
872 /* Add to big hash table */
ddbe5032 873 hash = inet6_addr_hash(addr);
1da177e4 874
5c578aed 875 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 876 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 877
878 write_lock(&idev->lock);
879 /* Add to inet6_dev unicast addr list. */
e55ffac6 880 ipv6_link_dev_addr(idev, ifa);
1da177e4 881
1da177e4 882 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 883 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 884 in6_ifa_hold(ifa);
885 }
1da177e4 886
1da177e4
LT		 887 in6_ifa_hold(ifa);
888 write_unlock(&idev->lock);
889out2:
8814c4b5 890 rcu_read_unlock_bh();
1da177e4 891
fd92833a 892 if (likely(err == 0))
f88c91dd 893 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 894 else {
895 kfree(ifa);
896 ifa = ERR_PTR(err);
897 }
898
899 return ifa;
900out:
5c578aed 901 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 902 goto out2;
903}
904
5b84efec
TH		 905enum cleanup_prefix_rt_t {
906 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
907 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
908 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
909};
910
911/*
912 * Check, whether the prefix for ifp would still need a prefix route
913 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
914 * constants.
915 *
916 * 1) we don't purge prefix if address was not permanent.
917 * prefix is managed by its own lifetime.
918 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
919 * 3) if there are no addresses, delete prefix.
920 * 4) if there are still other permanent address(es),
921 * corresponding prefix is still permanent.
922 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
923 * don't purge the prefix, assume user space is managing it.
924 * 6) otherwise, update prefix lifetime to the
925 * longest valid lifetime among the corresponding
926 * addresses on the device.
927 * Note: subsequent RA will update lifetime.
928 **/
929static enum cleanup_prefix_rt_t
930check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
931{
932 struct inet6_ifaddr *ifa;
933 struct inet6_dev *idev = ifp->idev;
934 unsigned long lifetime;
935 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
936
937 *expires = jiffies;
938
939 list_for_each_entry(ifa, &idev->addr_list, if_list) {
940 if (ifa == ifp)
941 continue;
942 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
943 ifp->prefix_len))
944 continue;
945 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
946 return CLEANUP_PREFIX_RT_NOP;
947
948 action = CLEANUP_PREFIX_RT_EXPIRE;
949
950 spin_lock(&ifa->lock);
951
952 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
953 /*
954 * Note: Because this address is
955 * not permanent, lifetime <
956 * LONG_MAX / HZ here.
957 */
958 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
959 *expires = ifa->tstamp + lifetime * HZ;
960 spin_unlock(&ifa->lock);
961 }
962
963 return action;
964}
965
966static void
967cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
968{
969 struct rt6_info *rt;
970
971 rt = addrconf_get_prefix_route(&ifp->addr,
972 ifp->prefix_len,
973 ifp->idev->dev,
974 0, RTF_GATEWAY | RTF_DEFAULT);
975 if (rt) {
976 if (del_rt)
977 ip6_del_rt(rt);
978 else {
979 if (!(rt->rt6i_flags & RTF_EXPIRES))
980 rt6_set_expires(rt, expires);
981 ip6_rt_put(rt);
982 }
983 }
984}
985
986
1da177e4
LT		 987/* This function wants to get referenced ifp and releases it before return */
988
989static void ipv6_del_addr(struct inet6_ifaddr *ifp)
990{
4c5ff6a6 991 int state;
5b84efec
TH		 992 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
993 unsigned long expires;
1da177e4 994
c15b1cca
HFS		 995 ASSERT_RTNL();
996
4c5ff6a6
HX		 997 spin_lock_bh(&ifp->state_lock);
998 state = ifp->state;
e9d3e084 999 ifp->state = INET6_IFADDR_STATE_DEAD;
4c5ff6a6
HX		 1000 spin_unlock_bh(&ifp->state_lock);
1001
1002 if (state == INET6_IFADDR_STATE_DEAD)
1003 goto out;
1da177e4 1004
5c578aed 1005 spin_lock_bh(&addrconf_hash_lock);
1006 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1007 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1008
5b84efec 1009 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1010
1da177e4 1011 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1012 list_del(&ifp->tmp_list);
1013 if (ifp->ifpub) {
1014 in6_ifa_put(ifp->ifpub);
1015 ifp->ifpub = NULL;
1da177e4 1016 }
372e6c8f 1017 __in6_ifa_put(ifp);
1da177e4 1018 }
1da177e4 1019
5b84efec
TH		 1020 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1021 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1022
5b84efec
TH		 1023 list_del_init(&ifp->if_list);
1024 __in6_ifa_put(ifp);
1025
1026 write_unlock_bh(&ifp->idev->lock);
1da177e4 1027
c15b1cca 1028 addrconf_del_dad_work(ifp);
b2238566 1029
1da177e4
LT		 1030 ipv6_ifa_notify(RTM_DELADDR, ifp);
1031
f88c91dd 1032 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1033
5b84efec
TH		 1034 if (action != CLEANUP_PREFIX_RT_NOP) {
1035 cleanup_prefix_route(ifp, expires,
1036 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1037 }
1038
c3968a85
DW		 1039 /* clean up prefsrc entries */
1040 rt6_remove_prefsrc(ifp);
4c5ff6a6 1041out:
1da177e4
LT		 1042 in6_ifa_put(ifp);
1043}
1044
1da177e4
LT		 1045static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1046{
1047 struct inet6_dev *idev = ifp->idev;
1048 struct in6_addr addr, *tmpaddr;
76f793e3 1049 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1050 unsigned long regen_advance;
1da177e4
LT		 1051 int tmp_plen;
1052 int ret = 0;
95c385b4 1053 u32 addr_flags;
76f793e3 1054 unsigned long now = jiffies;
1da177e4 1055
53bd6749 1056 write_lock_bh(&idev->lock);
1da177e4
LT		 1057 if (ift) {
1058 spin_lock_bh(&ift->lock);
1059 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1060 spin_unlock_bh(&ift->lock);
1061 tmpaddr = &addr;
1062 } else {
1063 tmpaddr = NULL;
1064 }
1065retry:
1066 in6_dev_hold(idev);
1067 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1068 write_unlock_bh(&idev->lock);
f3213831 1069 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1070 in6_dev_put(idev);
1071 ret = -1;
1072 goto out;
1073 }
1074 spin_lock_bh(&ifp->lock);
1075 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1076 idev->cnf.use_tempaddr = -1; /*XXX*/
1077 spin_unlock_bh(&ifp->lock);
53bd6749 1078 write_unlock_bh(&idev->lock);
f3213831
JP		 1079 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1080 __func__);
1da177e4
LT		 1081 in6_dev_put(idev);
1082 ret = -1;
1083 goto out;
1084 }
1085 in6_ifa_hold(ifp);
1086 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 1087 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1088 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1089 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 1090 tmp_valid_lft = min_t(__u32,
1091 ifp->valid_lft,
7a876b0e 1092 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 1093 tmp_prefered_lft = min_t(__u32,
1094 ifp->prefered_lft,
7a876b0e 1095 idev->cnf.temp_prefered_lft + age -
784e2710 1096 idev->cnf.max_desync_factor);
1da177e4 1097 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1098 tmp_tstamp = ifp->tstamp;
1099 spin_unlock_bh(&ifp->lock);
1100
eac55bf9 1101 regen_advance = idev->cnf.regen_max_retry *
7eaa48a4 1102 idev->cnf.dad_transmits *
1f9248e5 1103 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
53bd6749 1104 write_unlock_bh(&idev->lock);
95c385b4 1105
eac55bf9
BB		 1106 /* A temporary address is created only if this calculated Preferred
1107 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1108 * an implementation must not create a temporary address with a zero
1109 * Preferred Lifetime.
ecab6701
HK		 1110 * Use age calculation as in addrconf_verify to avoid unnecessary
1111 * temporary addresses being generated.
eac55bf9 1112 */
ecab6701
HK		 1113 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1114 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1115 in6_ifa_put(ifp);
1116 in6_dev_put(idev);
1117 ret = -1;
1118 goto out;
1119 }
1120
95c385b4
NH		 1121 addr_flags = IFA_F_TEMPORARY;
1122 /* set in addrconf_prefix_rcv() */
1123 if (ifp->flags & IFA_F_OPTIMISTIC)
1124 addr_flags |= IFA_F_OPTIMISTIC;
1125
4b08a8f1
HFS		 1126 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1127 ipv6_addr_scope(&addr), addr_flags,
1128 tmp_valid_lft, tmp_prefered_lft);
1129 if (IS_ERR(ift)) {
1da177e4
LT		 1130 in6_ifa_put(ifp);
1131 in6_dev_put(idev);
f3213831 1132 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1133 tmpaddr = &addr;
53bd6749 1134 write_lock_bh(&idev->lock);
1da177e4
LT		 1135 goto retry;
1136 }
1137
1138 spin_lock_bh(&ift->lock);
1139 ift->ifpub = ifp;
76f793e3 1140 ift->cstamp = now;
1da177e4
LT		 1141 ift->tstamp = tmp_tstamp;
1142 spin_unlock_bh(&ift->lock);
1143
cf22f9a2 1144 addrconf_dad_start(ift);
1da177e4
LT		 1145 in6_ifa_put(ift);
1146 in6_dev_put(idev);
1147out:
1148 return ret;
1149}
1da177e4
LT		 1150
1151/*
072047e4 1152 * Choose an appropriate source address (RFC3484)
1da177e4 1153 */
a9b05723
YH		 1154enum {
1155 IPV6_SADDR_RULE_INIT = 0,
1156 IPV6_SADDR_RULE_LOCAL,
1157 IPV6_SADDR_RULE_SCOPE,
1158 IPV6_SADDR_RULE_PREFERRED,
1159#ifdef CONFIG_IPV6_MIP6
1160 IPV6_SADDR_RULE_HOA,
1161#endif
1162 IPV6_SADDR_RULE_OIF,
1163 IPV6_SADDR_RULE_LABEL,
a9b05723 1164 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1165 IPV6_SADDR_RULE_ORCHID,
1166 IPV6_SADDR_RULE_PREFIX,
1167 IPV6_SADDR_RULE_MAX
1168};
1169
072047e4 1170struct ipv6_saddr_score {
a9b05723
YH		 1171 int rule;
1172 int addr_type;
1173 struct inet6_ifaddr *ifa;
1174 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1175 int scopedist;
1176 int matchlen;
072047e4
YH		 1177};
1178
a9b05723 1179struct ipv6_saddr_dst {
9acd9f3a 1180 const struct in6_addr *addr;
a9b05723
YH		 1181 int ifindex;
1182 int scope;
1183 int label;
7cbca67c 1184 unsigned int prefs;
a9b05723 1185};
072047e4 1186
b6f99a21 1187static inline int ipv6_saddr_preferred(int type)
1da177e4 1188{
45bb0060 1189 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1190 return 1;
1191 return 0;
1da177e4
LT		 1192}
1193
3de23255
BT		 1194static int ipv6_get_saddr_eval(struct net *net,
1195 struct ipv6_saddr_score *score,
a9b05723
YH		 1196 struct ipv6_saddr_dst *dst,
1197 int i)
1198{
1199 int ret;
1200
1201 if (i <= score->rule) {
1202 switch (i) {
1203 case IPV6_SADDR_RULE_SCOPE:
1204 ret = score->scopedist;
1205 break;
1206 case IPV6_SADDR_RULE_PREFIX:
1207 ret = score->matchlen;
1208 break;
1209 default:
1210 ret = !!test_bit(i, score->scorebits);
1211 }
1212 goto out;
1213 }
1214
1215 switch (i) {
1216 case IPV6_SADDR_RULE_INIT:
1217 /* Rule 0: remember if hiscore is not ready yet */
1218 ret = !!score->ifa;
1219 break;
1220 case IPV6_SADDR_RULE_LOCAL:
1221 /* Rule 1: Prefer same address */
1222 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1223 break;
1224 case IPV6_SADDR_RULE_SCOPE:
1225 /* Rule 2: Prefer appropriate scope
1226 *
1227 * ret
1228 * ^
1229 * -1 | d 15
1230 * ---+--+-+---> scope
1231 * |
1232 * | d is scope of the destination.
1233 * B-d | \
1234 * | \ <- smaller scope is better if
db9c7c39 1235 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1236 * | ret = B - scope (-1 <= scope >= d <= 15).
1237 * d-C-1 | /
1238 * |/ <- greater is better
1239 * -C / if scope is not enough for destination.
1240 * /| ret = scope - C (-1 <= d < scope <= 15).
1241 *
1242 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1243 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1244 * Assume B = 0 and we get C > 29.
1245 */
1246 ret = __ipv6_addr_src_scope(score->addr_type);
1247 if (ret >= dst->scope)
1248 ret = -ret;
1249 else
1250 ret -= 128; /* 30 is enough */
1251 score->scopedist = ret;
1252 break;
1253 case IPV6_SADDR_RULE_PREFERRED:
1254 /* Rule 3: Avoid deprecated and optimistic addresses */
1255 ret = ipv6_saddr_preferred(score->addr_type) ||
1256 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1257 break;
1258#ifdef CONFIG_IPV6_MIP6
1259 case IPV6_SADDR_RULE_HOA:
7cbca67c 1260 {
a9b05723 1261 /* Rule 4: Prefer home address */
7cbca67c
YH		 1262 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1263 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1264 break;
7cbca67c 1265 }
a9b05723
YH		 1266#endif
1267 case IPV6_SADDR_RULE_OIF:
1268 /* Rule 5: Prefer outgoing interface */
1269 ret = (!dst->ifindex ||
1270 dst->ifindex == score->ifa->idev->dev->ifindex);
1271 break;
1272 case IPV6_SADDR_RULE_LABEL:
1273 /* Rule 6: Prefer matching label */
3de23255
BT		 1274 ret = ipv6_addr_label(net,
1275 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1276 score->ifa->idev->dev->ifindex) == dst->label;
1277 break;
a9b05723 1278 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1279 {
a9b05723 1280 /* Rule 7: Prefer public address
25985edc 1281 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1282 */
7cbca67c
YH		 1283 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1284 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1285 score->ifa->idev->cnf.use_tempaddr >= 2;
1286 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1287 break;
7cbca67c 1288 }
a9b05723
YH		 1289 case IPV6_SADDR_RULE_ORCHID:
1290 /* Rule 8-: Prefer ORCHID vs ORCHID or
1291 * non-ORCHID vs non-ORCHID
1292 */
1293 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1294 ipv6_addr_orchid(dst->addr));
1295 break;
1296 case IPV6_SADDR_RULE_PREFIX:
1297 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1298 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1299 if (ret > score->ifa->prefix_len)
1300 ret = score->ifa->prefix_len;
1301 score->matchlen = ret;
a9b05723
YH		 1302 break;
1303 default:
1304 ret = 0;
1305 }
1306
1307 if (ret)
1308 __set_bit(i, score->scorebits);
1309 score->rule = i;
1310out:
1311 return ret;
1312}
1313
b3f644fc 1314int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1315 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1316 struct in6_addr *saddr)
1da177e4 1317{
a9b05723
YH		 1318 struct ipv6_saddr_score scores[2],
1319 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1320 struct ipv6_saddr_dst dst;
072047e4 1321 struct net_device *dev;
a9b05723 1322 int dst_type;
1da177e4 1323
a9b05723
YH		 1324 dst_type = __ipv6_addr_type(daddr);
1325 dst.addr = daddr;
1326 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1327 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1328 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1329 dst.prefs = prefs;
a9b05723
YH		 1330
1331 hiscore->rule = -1;
1332 hiscore->ifa = NULL;
1da177e4 1333
8814c4b5 1334 rcu_read_lock();
1da177e4 1335
c6d14c84 1336 for_each_netdev_rcu(net, dev) {
072047e4 1337 struct inet6_dev *idev;
072047e4 1338
a9b05723 1339 /* Candidate Source Address (section 4)
072047e4
YH		 1340 * - multicast and link-local destination address,
1341 * the set of candidate source address MUST only
1342 * include addresses assigned to interfaces
1343 * belonging to the same link as the outgoing
1344 * interface.
1345 * (- For site-local destination addresses, the
1346 * set of candidate source addresses MUST only
1347 * include addresses assigned to interfaces
1348 * belonging to the same site as the outgoing
1349 * interface.)
1350 */
a9b05723
YH		 1351 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1352 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1353 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1354 continue;
1da177e4 1355
1da177e4 1356 idev = __in6_dev_get(dev);
072047e4
YH		 1357 if (!idev)
1358 continue;
1359
1360 read_lock_bh(&idev->lock);
502a2ffd 1361 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1362 int i;
072047e4 1363
a9b05723 1364 /*
6b3ae80a
YH		 1365 * - Tentative Address (RFC2462 section 5.4)
1366 * - A tentative address is not considered
1367 * "assigned to an interface" in the traditional
95c385b4 1368 * sense, unless it is also flagged as optimistic.
6b3ae80a 1369 * - Candidate Source Address (section 4)
072047e4
YH		 1370 * - In any case, anycast addresses, multicast
1371 * addresses, and the unspecified address MUST
1372 * NOT be included in a candidate set.
1373 */
a9b05723
YH		 1374 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1375 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1376 continue;
a9b05723
YH		 1377
1378 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1379
1380 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1381 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1382 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1383 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1384 "assigned as unicast address on %s",
1385 dev->name);
1386 continue;
1387 }
1388
a9b05723
YH		 1389 score->rule = -1;
1390 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1391
1392 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1393 int minihiscore, miniscore;
1394
3de23255
BT		 1395 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1396 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1397
1398 if (minihiscore > miniscore) {
1399 if (i == IPV6_SADDR_RULE_SCOPE &&
1400 score->scopedist > 0) {
1401 /*
1402 * special case:
1403 * each remaining entry
1404 * has too small (not enough)
1405 * scope, because ifa entries
1406 * are sorted by their scope
1407 * values.
1408 */
1409 goto try_nextdev;
1410 }
1411 break;
1412 } else if (minihiscore < miniscore) {
a9b05723
YH		 1413 if (hiscore->ifa)
1414 in6_ifa_put(hiscore->ifa);
1415
1416 in6_ifa_hold(score->ifa);
1417
a0bffffc 1418 swap(hiscore, score);
a9b05723
YH		 1419
1420 /* restore our iterator */
1421 score->ifa = hiscore->ifa;
1422
1423 break;
1da177e4 1424 }
072047e4 1425 }
1da177e4 1426 }
a9b05723 1427try_nextdev:
072047e4 1428 read_unlock_bh(&idev->lock);
1da177e4 1429 }
8814c4b5 1430 rcu_read_unlock();
1da177e4 1431
a9b05723 1432 if (!hiscore->ifa)
072047e4 1433 return -EADDRNOTAVAIL;
1ab1457c 1434
4e3fd7a0 1435 *saddr = hiscore->ifa->addr;
a9b05723 1436 in6_ifa_put(hiscore->ifa);
072047e4 1437 return 0;
1da177e4 1438}
5e5f3f0f 1439EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1440
8965779d 1441int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1442 u32 banned_flags)
b7b1bfce
HFS		 1443{
1444 struct inet6_ifaddr *ifp;
1445 int err = -EADDRNOTAVAIL;
1446
602582ca
HFS		 1447 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1448 if (ifp->scope > IFA_LINK)
1449 break;
b7b1bfce
HFS		 1450 if (ifp->scope == IFA_LINK &&
1451 !(ifp->flags & banned_flags)) {
1452 *addr = ifp->addr;
1453 err = 0;
1454 break;
1455 }
1456 }
1457 return err;
1458}
1459
95c385b4 1460int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1461 u32 banned_flags)
1da177e4
LT		 1462{
1463 struct inet6_dev *idev;
1464 int err = -EADDRNOTAVAIL;
1465
8814c4b5 1466 rcu_read_lock();
e21e8467
SH		 1467 idev = __in6_dev_get(dev);
1468 if (idev) {
1da177e4 1469 read_lock_bh(&idev->lock);
b7b1bfce 1470 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1471 read_unlock_bh(&idev->lock);
1472 }
8814c4b5 1473 rcu_read_unlock();
1da177e4
LT		 1474 return err;
1475}
1476
1477static int ipv6_count_addresses(struct inet6_dev *idev)
1478{
1479 int cnt = 0;
1480 struct inet6_ifaddr *ifp;
1481
1482 read_lock_bh(&idev->lock);
502a2ffd 1483 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1484 cnt++;
1485 read_unlock_bh(&idev->lock);
1486 return cnt;
1487}
1488
b71d1d42 1489int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1490 const struct net_device *dev, int strict)
1da177e4 1491{
eedf042a 1492 struct inet6_ifaddr *ifp;
ddbe5032 1493 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1494
5c578aed 1495 rcu_read_lock_bh();
b67bfe0d 1496 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1497 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1498 continue;
1da177e4 1499 if (ipv6_addr_equal(&ifp->addr, addr) &&
eedf042a
SH		 1500 !(ifp->flags&IFA_F_TENTATIVE) &&
1501 (dev == NULL || ifp->idev->dev == dev ||
1502 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1503 rcu_read_unlock_bh();
1504 return 1;
1da177e4
LT		 1505 }
1506 }
5c578aed 1507
eedf042a
SH		 1508 rcu_read_unlock_bh();
1509 return 0;
1da177e4 1510}
7159039a
YH		 1511EXPORT_SYMBOL(ipv6_chk_addr);
1512
3e81c6da
DM		 1513static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1514 struct net_device *dev)
1da177e4 1515{
ddbe5032 1516 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1517 struct inet6_ifaddr *ifp;
1da177e4 1518
b67bfe0d 1519 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1520 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1521 continue;
1da177e4
LT		 1522 if (ipv6_addr_equal(&ifp->addr, addr)) {
1523 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1524 return true;
1da177e4
LT		 1525 }
1526 }
3e81c6da 1527 return false;
1da177e4
LT		 1528}
1529
7df37ff3
CB		 1530/* Compares an address/prefix_len with addresses on device @dev.
1531 * If one is found it returns true.
1532 */
1533bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1534 const unsigned int prefix_len, struct net_device *dev)
1535{
1536 struct inet6_dev *idev;
1537 struct inet6_ifaddr *ifa;
1538 bool ret = false;
1539
1540 rcu_read_lock();
1541 idev = __in6_dev_get(dev);
1542 if (idev) {
1543 read_lock_bh(&idev->lock);
1544 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1545 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1546 if (ret)
1547 break;
1548 }
1549 read_unlock_bh(&idev->lock);
1550 }
1551 rcu_read_unlock();
1552
1553 return ret;
1554}
1555EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1556
b71d1d42 1557int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1558{
1559 struct inet6_dev *idev;
1560 struct inet6_ifaddr *ifa;
1561 int onlink;
1562
1563 onlink = 0;
1564 rcu_read_lock();
1565 idev = __in6_dev_get(dev);
1566 if (idev) {
1567 read_lock_bh(&idev->lock);
502a2ffd 1568 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1569 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1570 ifa->prefix_len);
1571 if (onlink)
1572 break;
1573 }
1574 read_unlock_bh(&idev->lock);
1575 }
1576 rcu_read_unlock();
1577 return onlink;
1578}
52eeeb84
YH		 1579EXPORT_SYMBOL(ipv6_chk_prefix);
1580
9acd9f3a 1581struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1582 struct net_device *dev, int strict)
1da177e4 1583{
b79d1d54 1584 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1585 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1586
5c578aed 1587 rcu_read_lock_bh();
b67bfe0d 1588 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1589 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1590 continue;
1da177e4
LT		 1591 if (ipv6_addr_equal(&ifp->addr, addr)) {
1592 if (dev == NULL || ifp->idev->dev == dev ||
1593 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1594 result = ifp;
1da177e4
LT		 1595 in6_ifa_hold(ifp);
1596 break;
1597 }
1598 }
1599 }
5c578aed 1600 rcu_read_unlock_bh();
1da177e4 1601
b79d1d54 1602 return result;
1da177e4
LT		 1603}
1604
1da177e4
LT		 1605/* Gets referenced address, destroys ifaddr */
1606
cc411d0b 1607static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1608{
1da177e4
LT		 1609 if (ifp->flags&IFA_F_PERMANENT) {
1610 spin_lock_bh(&ifp->lock);
c15b1cca 1611 addrconf_del_dad_work(ifp);
1da177e4 1612 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1613 if (dad_failed)
1614 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1615 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1616 if (dad_failed)
1617 ipv6_ifa_notify(0, ifp);
1da177e4 1618 in6_ifa_put(ifp);
1da177e4
LT		 1619 } else if (ifp->flags&IFA_F_TEMPORARY) {
1620 struct inet6_ifaddr *ifpub;
1621 spin_lock_bh(&ifp->lock);
1622 ifpub = ifp->ifpub;
1623 if (ifpub) {
1624 in6_ifa_hold(ifpub);
1625 spin_unlock_bh(&ifp->lock);
1626 ipv6_create_tempaddr(ifpub, ifp);
1627 in6_ifa_put(ifpub);
1628 } else {
1629 spin_unlock_bh(&ifp->lock);
1630 }
1631 ipv6_del_addr(ifp);
c15b1cca 1632 } else {
1da177e4 1633 ipv6_del_addr(ifp);
c15b1cca 1634 }
1da177e4
LT		 1635}
1636
f2344a13
HX		 1637static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1638{
1639 int err = -ENOENT;
1640
c15b1cca 1641 spin_lock_bh(&ifp->state_lock);
f2344a13
HX		 1642 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1643 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1644 err = 0;
1645 }
c15b1cca 1646 spin_unlock_bh(&ifp->state_lock);
f2344a13
HX		 1647
1648 return err;
1649}
1650
3c21edbd
YH		 1651void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1652{
1b34be74 1653 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1654
853dc2e0
UB		 1655 if (addrconf_dad_end(ifp)) {
1656 in6_ifa_put(ifp);
f2344a13 1657 return;
853dc2e0 1658 }
f2344a13 1659
e87cc472
JP		 1660 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1661 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1662
1b34be74
YH		 1663 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1664 struct in6_addr addr;
1665
1666 addr.s6_addr32[0] = htonl(0xfe800000);
1667 addr.s6_addr32[1] = 0;
1668
1669 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1670 ipv6_addr_equal(&ifp->addr, &addr)) {
1671 /* DAD failed for link-local based on MAC address */
1672 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1673
f3213831 1674 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1675 ifp->idev->dev->name);
1b34be74
YH		 1676 }
1677 }
1678
c15b1cca
HFS		 1679 spin_lock_bh(&ifp->state_lock);
1680 /* transition from _POSTDAD to _ERRDAD */
1681 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1682 spin_unlock_bh(&ifp->state_lock);
1683
1684 addrconf_mod_dad_work(ifp, 0);
3c21edbd 1685}
1da177e4
LT		 1686
1687/* Join to solicited addr multicast group. */
1688
b71d1d42 1689void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1690{
1691 struct in6_addr maddr;
1692
c15b1cca
HFS		 1693 ASSERT_RTNL();
1694
1da177e4
LT		 1695 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1696 return;
1697
1698 addrconf_addr_solict_mult(addr, &maddr);
1699 ipv6_dev_mc_inc(dev, &maddr);
1700}
1701
b71d1d42 1702void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1703{
1704 struct in6_addr maddr;
1705
c15b1cca
HFS		 1706 ASSERT_RTNL();
1707
1da177e4
LT		 1708 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1709 return;
1710
1711 addrconf_addr_solict_mult(addr, &maddr);
1712 __ipv6_dev_mc_dec(idev, &maddr);
1713}
1714
20380731 1715static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1716{
1717 struct in6_addr addr;
c15b1cca
HFS		 1718
1719 ASSERT_RTNL();
1720
88ad3149 1721 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 1722 return;
1da177e4
LT		 1723 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1724 if (ipv6_addr_any(&addr))
1725 return;
1726 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1727}
1728
20380731 1729static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1730{
1731 struct in6_addr addr;
c15b1cca
HFS		 1732
1733 ASSERT_RTNL();
1734
88ad3149 1735 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 1736 return;
1da177e4
LT		 1737 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1738 if (ipv6_addr_any(&addr))
1739 return;
1740 __ipv6_dev_ac_dec(ifp->idev, &addr);
1741}
1742
073a8e0e
YH		 1743static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1744{
1745 if (dev->addr_len != ETH_ALEN)
1746 return -1;
1747 memcpy(eui, dev->dev_addr, 3);
1748 memcpy(eui + 5, dev->dev_addr + 3, 3);
1749
1750 /*
1751 * The zSeries OSA network cards can be shared among various
1752 * OS instances, but the OSA cards have only one MAC address.
1753 * This leads to duplicate address conflicts in conjunction
1754 * with IPv6 if more than one instance uses the same card.
1755 *
1756 * The driver for these cards can deliver a unique 16-bit
1757 * identifier for each instance sharing the same card. It is
1758 * placed instead of 0xFFFE in the interface identifier. The
1759 * "u" bit of the interface identifier is not inverted in this
1760 * case. Hence the resulting interface identifier has local
1761 * scope according to RFC2373.
1762 */
1763 if (dev->dev_id) {
1764 eui[3] = (dev->dev_id >> 8) & 0xFF;
1765 eui[4] = dev->dev_id & 0xFF;
1766 } else {
1767 eui[3] = 0xFF;
1768 eui[4] = 0xFE;
1769 eui[0] ^= 2;
1770 }
1771 return 0;
1772}
1773
06a4c1c5 1774static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1775{
1776 if (dev->addr_len != IEEE802154_ADDR_LEN)
1777 return -1;
1778 memcpy(eui, dev->dev_addr, 8);
5e98a36e 1779 eui[0] ^= 2;
06a4c1c5 1780 return 0;
1781}
1782
cb6bf355
YH		 1783static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1784{
1785 union fwnet_hwaddr *ha;
1786
1787 if (dev->addr_len != FWNET_ALEN)
1788 return -1;
1789
1790 ha = (union fwnet_hwaddr *)dev->dev_addr;
1791
1792 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1793 eui[0] ^= 2;
1794 return 0;
1795}
1796
073a8e0e
YH		 1797static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1798{
1799 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1800 if (dev->addr_len != ARCNET_ALEN)
1801 return -1;
1802 memset(eui, 0, 7);
8e5e8f30 1803 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1804 return 0;
1805}
1806
1807static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1808{
1809 if (dev->addr_len != INFINIBAND_ALEN)
1810 return -1;
1811 memcpy(eui, dev->dev_addr + 12, 8);
1812 eui[0] |= 2;
1813 return 0;
1814}
1815
c61393ea 1816static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1817{
9af28511
SH		 1818 if (addr == 0)
1819 return -1;
dfd982ba
YH		 1820 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1821 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1822 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1823 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1824 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1825 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1826 eui[1] = 0;
1827 eui[2] = 0x5E;
1828 eui[3] = 0xFE;
1829 memcpy(eui + 4, &addr, 4);
1830 return 0;
1831}
dfd982ba
YH		 1832
1833static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1834{
1835 if (dev->priv_flags & IFF_ISATAP)
1836 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1837 return -1;
1838}
1839
aee80b54 1840static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1841{
1842 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1843}
1844
e837735e
ND		 1845static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1846{
1847 memcpy(eui, dev->perm_addr, 3);
1848 memcpy(eui + 5, dev->perm_addr + 3, 3);
1849 eui[3] = 0xFF;
1850 eui[4] = 0xFE;
1851 eui[0] ^= 2;
1852 return 0;
1853}
1854
1da177e4
LT		 1855static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1856{
1857 switch (dev->type) {
1858 case ARPHRD_ETHER:
1859 case ARPHRD_FDDI:
073a8e0e 1860 return addrconf_ifid_eui48(eui, dev);
1da177e4 1861 case ARPHRD_ARCNET:
073a8e0e 1862 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1863 case ARPHRD_INFINIBAND:
073a8e0e 1864 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1865 case ARPHRD_SIT:
dfd982ba 1866 return addrconf_ifid_sit(eui, dev);
aee80b54 1867 case ARPHRD_IPGRE:
1868 return addrconf_ifid_gre(eui, dev);
e74bccb8 1869 case ARPHRD_6LOWPAN:
06a4c1c5 1870 case ARPHRD_IEEE802154:
1871 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 1872 case ARPHRD_IEEE1394:
1873 return addrconf_ifid_ieee1394(eui, dev);
e837735e
ND		 1874 case ARPHRD_TUNNEL6:
1875 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 1876 }
1877 return -1;
1878}
1879
1880static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1881{
1882 int err = -1;
1883 struct inet6_ifaddr *ifp;
1884
1885 read_lock_bh(&idev->lock);
602582ca
HFS		 1886 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1887 if (ifp->scope > IFA_LINK)
1888 break;
1da177e4
LT		 1889 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1890 memcpy(eui, ifp->addr.s6_addr+8, 8);
1891 err = 0;
1892 break;
1893 }
1894 }
1895 read_unlock_bh(&idev->lock);
1896 return err;
1897}
1898
1da177e4 1899/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 1900static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 1901{
1da177e4 1902regen:
955189ef 1903 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1904 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1905
1906 /*
1907 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1908 * check if generated address is not inappropriate
1909 *
1910 * - Reserved subnet anycast (RFC 2526)
1911 * 11111101 11....11 1xxxxxxx
c7dc89c0 1912 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1913 * 00-00-5E-FE-xx-xx-xx-xx
1914 * - value 0
1915 * - XXX: already assigned to an address on the device
1916 */
1ab1457c 1917 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1918 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1919 (idev->rndid[7]&0x80))
1920 goto regen;
1921 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1922 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1923 goto regen;
1924 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1925 goto regen;
1926 }
1da177e4
LT		 1927}
1928
1929static void ipv6_regen_rndid(unsigned long data)
1930{
1931 struct inet6_dev *idev = (struct inet6_dev *) data;
1932 unsigned long expires;
1933
8814c4b5 1934 rcu_read_lock_bh();
1da177e4
LT		 1935 write_lock_bh(&idev->lock);
1936
1937 if (idev->dead)
1938 goto out;
1939
eb7e0575 1940 __ipv6_regen_rndid(idev);
1ab1457c 1941
1da177e4 1942 expires = jiffies +
1ab1457c 1943 idev->cnf.temp_prefered_lft * HZ -
1f9248e5
JP		 1944 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
1945 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
784e2710 1946 idev->cnf.max_desync_factor * HZ;
1da177e4 1947 if (time_before(expires, jiffies)) {
f3213831
JP		 1948 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1949 __func__, idev->dev->name);
1da177e4
LT		 1950 goto out;
1951 }
1952
1953 if (!mod_timer(&idev->regen_timer, expires))
1954 in6_dev_hold(idev);
1955
1956out:
1957 write_unlock_bh(&idev->lock);
8814c4b5 1958 rcu_read_unlock_bh();
1da177e4
LT		 1959 in6_dev_put(idev);
1960}
1961
eb7e0575 1962static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 1963{
1da177e4 1964 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 1965 __ipv6_regen_rndid(idev);
1da177e4 1966}
1da177e4
LT		 1967
1968/*
1969 * Add prefix route.
1970 */
1971
1972static void
1973addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1974 unsigned long expires, u32 flags)
1da177e4 1975{
86872cb5
TG		 1976 struct fib6_config cfg = {
1977 .fc_table = RT6_TABLE_PREFIX,
1978 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1979 .fc_ifindex = dev->ifindex,
1980 .fc_expires = expires,
1981 .fc_dst_len = plen,
1982 .fc_flags = RTF_UP | flags,
c346dca1 1983 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1984 .fc_protocol = RTPROT_KERNEL,
86872cb5 1985 };
1da177e4 1986
4e3fd7a0 1987 cfg.fc_dst = *pfx;
1da177e4
LT		 1988
1989 /* Prevent useless cloning on PtP SIT.
1990 This thing is done here expecting that the whole
1991 class of non-broadcast devices need not cloning.
1992 */
07a93626 1993#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 1994 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1995 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1996#endif
1da177e4 1997
86872cb5 1998 ip6_route_add(&cfg);
1da177e4
LT		 1999}
2000
14ef37b6
AH		 2001
2002static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2003 int plen,
2004 const struct net_device *dev,
2005 u32 flags, u32 noflags)
2006{
2007 struct fib6_node *fn;
2008 struct rt6_info *rt = NULL;
2009 struct fib6_table *table;
2010
2011 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
2012 if (table == NULL)
2013 return NULL;
2014
5744dd9b 2015 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2016 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2017 if (!fn)
2018 goto out;
2019 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2020 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2021 continue;
2022 if ((rt->rt6i_flags & flags) != flags)
2023 continue;
85da53bf 2024 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2025 continue;
2026 dst_hold(&rt->dst);
2027 break;
2028 }
2029out:
5744dd9b 2030 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2031 return rt;
2032}
2033
2034
1da177e4
LT		 2035/* Create "default" multicast route to the interface */
2036
2037static void addrconf_add_mroute(struct net_device *dev)
2038{
86872cb5
TG		 2039 struct fib6_config cfg = {
2040 .fc_table = RT6_TABLE_LOCAL,
2041 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2042 .fc_ifindex = dev->ifindex,
2043 .fc_dst_len = 8,
2044 .fc_flags = RTF_UP,
c346dca1 2045 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2046 };
2047
2048 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2049
2050 ip6_route_add(&cfg);
1da177e4
LT		 2051}
2052
1da177e4
LT		 2053static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2054{
2055 struct inet6_dev *idev;
2056
2057 ASSERT_RTNL();
2058
e21e8467
SH		 2059 idev = ipv6_find_idev(dev);
2060 if (!idev)
64e724f6
BH		 2061 return ERR_PTR(-ENOBUFS);
2062
2063 if (idev->cnf.disable_ipv6)
2064 return ERR_PTR(-EACCES);
1da177e4
LT		 2065
2066 /* Add default multicast route */
4af04aba
LW		 2067 if (!(dev->flags & IFF_LOOPBACK))
2068 addrconf_add_mroute(dev);
1da177e4 2069
1da177e4
LT		 2070 return idev;
2071}
2072
53bd6749
JP		 2073static void manage_tempaddrs(struct inet6_dev *idev,
2074 struct inet6_ifaddr *ifp,
2075 __u32 valid_lft, __u32 prefered_lft,
2076 bool create, unsigned long now)
2077{
2078 u32 flags;
2079 struct inet6_ifaddr *ift;
2080
2081 read_lock_bh(&idev->lock);
2082 /* update all temporary addresses in the list */
2083 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2084 int age, max_valid, max_prefered;
2085
2086 if (ifp != ift->ifpub)
2087 continue;
2088
2089 /* RFC 4941 section 3.3:
2090 * If a received option will extend the lifetime of a public
2091 * address, the lifetimes of temporary addresses should
2092 * be extended, subject to the overall constraint that no
2093 * temporary addresses should ever remain "valid" or "preferred"
2094 * for a time longer than (TEMP_VALID_LIFETIME) or
2095 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2096 */
2097 age = (now - ift->cstamp) / HZ;
2098 max_valid = idev->cnf.temp_valid_lft - age;
2099 if (max_valid < 0)
2100 max_valid = 0;
2101
2102 max_prefered = idev->cnf.temp_prefered_lft -
2103 idev->cnf.max_desync_factor - age;
2104 if (max_prefered < 0)
2105 max_prefered = 0;
2106
2107 if (valid_lft > max_valid)
2108 valid_lft = max_valid;
2109
2110 if (prefered_lft > max_prefered)
2111 prefered_lft = max_prefered;
2112
2113 spin_lock(&ift->lock);
2114 flags = ift->flags;
2115 ift->valid_lft = valid_lft;
2116 ift->prefered_lft = prefered_lft;
2117 ift->tstamp = now;
2118 if (prefered_lft > 0)
2119 ift->flags &= ~IFA_F_DEPRECATED;
2120
2121 spin_unlock(&ift->lock);
2122 if (!(flags&IFA_F_TENTATIVE))
2123 ipv6_ifa_notify(0, ift);
2124 }
2125
2126 if ((create || list_empty(&idev->tempaddr_list)) &&
2127 idev->cnf.use_tempaddr > 0) {
2128 /* When a new public address is created as described
2129 * in [ADDRCONF], also create a new temporary address.
2130 * Also create a temporary address if it's enabled but
2131 * no temporary address currently exists.
2132 */
2133 read_unlock_bh(&idev->lock);
2134 ipv6_create_tempaddr(ifp, NULL);
2135 } else {
2136 read_unlock_bh(&idev->lock);
2137 }
2138}
2139
e6bff995 2140void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2141{
2142 struct prefix_info *pinfo;
2143 __u32 valid_lft;
2144 __u32 prefered_lft;
2145 int addr_type;
1da177e4 2146 struct inet6_dev *in6_dev;
56d417b1 2147 struct net *net = dev_net(dev);
1da177e4
LT		 2148
2149 pinfo = (struct prefix_info *) opt;
1ab1457c 2150
1da177e4 2151 if (len < sizeof(struct prefix_info)) {
ba3542e1 2152 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2153 return;
2154 }
1ab1457c 2155
1da177e4
LT		 2156 /*
2157 * Validation checks ([ADDRCONF], page 19)
2158 */
2159
2160 addr_type = ipv6_addr_type(&pinfo->prefix);
2161
2162 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2163 return;
2164
2165 valid_lft = ntohl(pinfo->valid);
2166 prefered_lft = ntohl(pinfo->prefered);
2167
2168 if (prefered_lft > valid_lft) {
e87cc472 2169 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2170 return;
2171 }
2172
2173 in6_dev = in6_dev_get(dev);
2174
2175 if (in6_dev == NULL) {
e87cc472
JP		 2176 net_dbg_ratelimited("addrconf: device %s not configured\n",
2177 dev->name);
1da177e4
LT		 2178 return;
2179 }
2180
2181 /*
2182 * Two things going on here:
2183 * 1) Add routes for on-link prefixes
2184 * 2) Configure prefixes with the auto flag set
2185 */
2186
4bed72e4
YH		 2187 if (pinfo->onlink) {
2188 struct rt6_info *rt;
2189 unsigned long rt_expires;
2190
6f704992
YH		 2191 /* Avoid arithmetic overflow. Really, we could
2192 * save rt_expires in seconds, likely valid_lft,
2193 * but it would require division in fib gc, that it
2194 * not good.
2195 */
4bed72e4
YH		 2196 if (HZ > USER_HZ)
2197 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2198 else
2199 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2200
4bed72e4
YH		 2201 if (addrconf_finite_timeout(rt_expires))
2202 rt_expires *= HZ;
1da177e4 2203
14ef37b6
AH		 2204 rt = addrconf_get_prefix_route(&pinfo->prefix,
2205 pinfo->prefix_len,
2206 dev,
2207 RTF_ADDRCONF | RTF_PREFIX_RT,
2208 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2209
14ef37b6 2210 if (rt) {
6f704992
YH		 2211 /* Autoconf prefix route */
2212 if (valid_lft == 0) {
2213 ip6_del_rt(rt);
2214 rt = NULL;
4bed72e4 2215 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2216 /* not infinity */
1716a961 2217 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2218 } else {
1716a961 2219 rt6_clean_expires(rt);
1da177e4
LT		 2220 }
2221 } else if (valid_lft) {
6f704992 2222 clock_t expires = 0;
4bed72e4
YH		 2223 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2224 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2225 /* not infinity */
2226 flags |= RTF_EXPIRES;
2227 expires = jiffies_to_clock_t(rt_expires);
2228 }
1da177e4 2229 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2230 dev, expires, flags);
1da177e4 2231 }
94e187c0 2232 ip6_rt_put(rt);
1da177e4
LT		 2233 }
2234
2235 /* Try to figure out our local address for this prefix */
2236
2237 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2238 struct inet6_ifaddr *ifp;
1da177e4
LT		 2239 struct in6_addr addr;
2240 int create = 0, update_lft = 0;
617fe29d 2241 bool tokenized = false;
1da177e4
LT		 2242
2243 if (pinfo->prefix_len == 64) {
2244 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2245
2246 if (!ipv6_addr_any(&in6_dev->token)) {
2247 read_lock_bh(&in6_dev->lock);
2248 memcpy(addr.s6_addr + 8,
2249 in6_dev->token.s6_addr + 8, 8);
2250 read_unlock_bh(&in6_dev->lock);
617fe29d 2251 tokenized = true;
f53adae4
DB		 2252 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2253 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1da177e4
LT		 2254 in6_dev_put(in6_dev);
2255 return;
2256 }
2257 goto ok;
2258 }
e87cc472
JP		 2259 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2260 pinfo->prefix_len);
1da177e4
LT		 2261 in6_dev_put(in6_dev);
2262 return;
2263
2264ok:
2265
53b7997f 2266 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 2267
2268 if (ifp == NULL && valid_lft) {
2269 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2270 u32 addr_flags = 0;
2271
2272#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2273 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2274 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 2275 addr_flags = IFA_F_OPTIMISTIC;
2276#endif
1da177e4
LT		 2277
2278 /* Do not allow to create too much of autoconfigured
2279 * addresses; this would be too easy way to crash kernel.
2280 */
2281 if (!max_addresses ||
2282 ipv6_count_addresses(in6_dev) < max_addresses)
3f8f5298
JP		 2283 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2284 pinfo->prefix_len,
95c385b4 2285 addr_type&IPV6_ADDR_SCOPE_MASK,
8a226b2c
JB		 2286 addr_flags, valid_lft,
2287 prefered_lft);
1da177e4 2288
3f0d2ba0 2289 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2290 in6_dev_put(in6_dev);
2291 return;
2292 }
2293
8a226b2c
JB		 2294 update_lft = 0;
2295 create = 1;
c15b1cca
HFS		 2296 spin_lock_bh(&ifp->lock);
2297 ifp->flags |= IFA_F_MANAGETEMPADDR;
1da177e4 2298 ifp->cstamp = jiffies;
617fe29d 2299 ifp->tokenized = tokenized;
c15b1cca 2300 spin_unlock_bh(&ifp->lock);
cf22f9a2 2301 addrconf_dad_start(ifp);
1da177e4
LT		 2302 }
2303
2304 if (ifp) {
479840ff 2305 u32 flags;
1da177e4 2306 unsigned long now;
1da177e4
LT		 2307 u32 stored_lft;
2308
2309 /* update lifetime (RFC2462 5.5.3 e) */
2310 spin_lock(&ifp->lock);
2311 now = jiffies;
2312 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2313 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2314 else
2315 stored_lft = 0;
8a226b2c 2316 if (!update_lft && !create && stored_lft) {
c9d55d5b
PM		 2317 const u32 minimum_lft = min(
2318 stored_lft, (u32)MIN_VALID_LIFETIME);
2319 valid_lft = max(valid_lft, minimum_lft);
2320
2321 /* RFC4862 Section 5.5.3e:
2322 * "Note that the preferred lifetime of the
2323 * corresponding address is always reset to
2324 * the Preferred Lifetime in the received
2325 * Prefix Information option, regardless of
2326 * whether the valid lifetime is also reset or
2327 * ignored."
2328 *
2329 * So we should always update prefered_lft here.
2330 */
2331 update_lft = 1;
1da177e4
LT		 2332 }
2333
2334 if (update_lft) {
2335 ifp->valid_lft = valid_lft;
2336 ifp->prefered_lft = prefered_lft;
2337 ifp->tstamp = now;
2338 flags = ifp->flags;
2339 ifp->flags &= ~IFA_F_DEPRECATED;
2340 spin_unlock(&ifp->lock);
2341
2342 if (!(flags&IFA_F_TENTATIVE))
2343 ipv6_ifa_notify(0, ifp);
2344 } else
2345 spin_unlock(&ifp->lock);
2346
53bd6749
JP		 2347 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2348 create, now);
5d9efa7e 2349
1da177e4 2350 in6_ifa_put(ifp);
c15b1cca 2351 addrconf_verify();
1da177e4
LT		 2352 }
2353 }
2354 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2355 in6_dev_put(in6_dev);
2356}
2357
2358/*
2359 * Set destination address.
2360 * Special case for SIT interfaces where we create a new "virtual"
2361 * device.
2362 */
af284937 2363int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2364{
2365 struct in6_ifreq ireq;
2366 struct net_device *dev;
2367 int err = -EINVAL;
2368
2369 rtnl_lock();
2370
2371 err = -EFAULT;
2372 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2373 goto err_exit;
2374
af284937 2375 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2376
2377 err = -ENODEV;
2378 if (dev == NULL)
2379 goto err_exit;
2380
07a93626 2381#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2382 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2383 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2384 struct ifreq ifr;
1da177e4
LT		 2385 struct ip_tunnel_parm p;
2386
2387 err = -EADDRNOTAVAIL;
2388 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2389 goto err_exit;
2390
2391 memset(&p, 0, sizeof(p));
2392 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2393 p.iph.saddr = 0;
2394 p.iph.version = 4;
2395 p.iph.ihl = 5;
2396 p.iph.protocol = IPPROTO_IPV6;
2397 p.iph.ttl = 64;
d20b3109 2398 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2399
5bc3eb7e
SH		 2400 if (ops->ndo_do_ioctl) {
2401 mm_segment_t oldfs = get_fs();
2402
2403 set_fs(KERNEL_DS);
2404 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2405 set_fs(oldfs);
2406 } else
2407 err = -EOPNOTSUPP;
1da177e4
LT		 2408
2409 if (err == 0) {
2410 err = -ENOBUFS;
af284937
DL		 2411 dev = __dev_get_by_name(net, p.name);
2412 if (!dev)
1da177e4
LT		 2413 goto err_exit;
2414 err = dev_open(dev);
2415 }
2416 }
0be669bb 2417#endif
1da177e4
LT		 2418
2419err_exit:
2420 rtnl_unlock();
2421 return err;
2422}
2423
2424/*
2425 * Manual configuration of address on an interface
2426 */
479840ff
JP		 2427static int inet6_addr_add(struct net *net, int ifindex,
2428 const struct in6_addr *pfx,
caeaba79 2429 const struct in6_addr *peer_pfx,
479840ff
JP		 2430 unsigned int plen, __u32 ifa_flags,
2431 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2432{
2433 struct inet6_ifaddr *ifp;
2434 struct inet6_dev *idev;
2435 struct net_device *dev;
2436 int scope;
6f704992
YH		 2437 u32 flags;
2438 clock_t expires;
4bed72e4 2439 unsigned long timeout;
1da177e4
LT		 2440
2441 ASSERT_RTNL();
1ab1457c 2442
24ef0da7
TG		 2443 if (plen > 128)
2444 return -EINVAL;
2445
0778769d
NT		 2446 /* check the lifetime */
2447 if (!valid_lft || prefered_lft > valid_lft)
2448 return -EINVAL;
2449
53bd6749
JP		 2450 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2451 return -EINVAL;
2452
af284937
DL		 2453 dev = __dev_get_by_index(net, ifindex);
2454 if (!dev)
1da177e4 2455 return -ENODEV;
1ab1457c 2456
64e724f6
BH		 2457 idev = addrconf_add_dev(dev);
2458 if (IS_ERR(idev))
2459 return PTR_ERR(idev);
1da177e4
LT		 2460
2461 scope = ipv6_addr_scope(pfx);
2462
4bed72e4
YH		 2463 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2464 if (addrconf_finite_timeout(timeout)) {
2465 expires = jiffies_to_clock_t(timeout * HZ);
2466 valid_lft = timeout;
6f704992 2467 flags = RTF_EXPIRES;
4bed72e4
YH		 2468 } else {
2469 expires = 0;
2470 flags = 0;
2471 ifa_flags |= IFA_F_PERMANENT;
6f704992 2472 }
0778769d 2473
4bed72e4
YH		 2474 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2475 if (addrconf_finite_timeout(timeout)) {
2476 if (timeout == 0)
2477 ifa_flags |= IFA_F_DEPRECATED;
2478 prefered_lft = timeout;
2479 }
0778769d 2480
8a226b2c
JB		 2481 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2482 valid_lft, prefered_lft);
0778769d 2483
1da177e4 2484 if (!IS_ERR(ifp)) {
761aac73
TH		 2485 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2486 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2487 expires, flags);
2488 }
2489
95c385b4
NH		 2490 /*
2491 * Note that section 3.1 of RFC 4429 indicates
2492 * that the Optimistic flag should not be set for
2493 * manually configured addresses
2494 */
cf22f9a2 2495 addrconf_dad_start(ifp);
53bd6749
JP		 2496 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2497 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2498 true, jiffies);
1da177e4 2499 in6_ifa_put(ifp);
c15b1cca 2500 addrconf_verify_rtnl();
1da177e4
LT		 2501 return 0;
2502 }
2503
2504 return PTR_ERR(ifp);
2505}
2506
6046d5b4
HK		 2507static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2508 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2509{
2510 struct inet6_ifaddr *ifp;
2511 struct inet6_dev *idev;
2512 struct net_device *dev;
1ab1457c 2513
24ef0da7
TG		 2514 if (plen > 128)
2515 return -EINVAL;
2516
af284937
DL		 2517 dev = __dev_get_by_index(net, ifindex);
2518 if (!dev)
1da177e4
LT		 2519 return -ENODEV;
2520
7eaa48a4 2521 if ((idev = __in6_dev_get(dev)) == NULL)
1da177e4
LT		 2522 return -ENXIO;
2523
2524 read_lock_bh(&idev->lock);
502a2ffd 2525 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2526 if (ifp->prefix_len == plen &&
2527 ipv6_addr_equal(pfx, &ifp->addr)) {
2528 in6_ifa_hold(ifp);
2529 read_unlock_bh(&idev->lock);
1ab1457c 2530
6046d5b4
HK		 2531 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2532 (ifa_flags & IFA_F_MANAGETEMPADDR))
2533 manage_tempaddrs(idev, ifp, 0, 0, false,
2534 jiffies);
1da177e4 2535 ipv6_del_addr(ifp);
6046d5b4 2536 addrconf_verify_rtnl();
1da177e4
LT		 2537 return 0;
2538 }
2539 }
2540 read_unlock_bh(&idev->lock);
2541 return -EADDRNOTAVAIL;
2542}
2543
2544
af284937 2545int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2546{
2547 struct in6_ifreq ireq;
2548 int err;
1ab1457c 2549
af31f412 2550 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2551 return -EPERM;
1ab1457c 2552
1da177e4
LT		 2553 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2554 return -EFAULT;
2555
2556 rtnl_lock();
caeaba79 2557 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2558 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2559 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2560 rtnl_unlock();
2561 return err;
2562}
2563
af284937 2564int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2565{
2566 struct in6_ifreq ireq;
2567 int err;
1ab1457c 2568
af31f412 2569 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2570 return -EPERM;
2571
2572 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2573 return -EFAULT;
2574
2575 rtnl_lock();
6046d5b4 2576 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2577 ireq.ifr6_prefixlen);
1da177e4
LT		 2578 rtnl_unlock();
2579 return err;
2580}
2581
b5f348e5
IJ		 2582static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2583 int plen, int scope)
2584{
2585 struct inet6_ifaddr *ifp;
2586
8a226b2c 2587 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2588 scope, IFA_F_PERMANENT,
2589 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2590 if (!IS_ERR(ifp)) {
2591 spin_lock_bh(&ifp->lock);
2592 ifp->flags &= ~IFA_F_TENTATIVE;
2593 spin_unlock_bh(&ifp->lock);
2594 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2595 in6_ifa_put(ifp);
2596 }
2597}
2598
07a93626 2599#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2600static void sit_add_v4_addrs(struct inet6_dev *idev)
2601{
1da177e4
LT		 2602 struct in6_addr addr;
2603 struct net_device *dev;
c346dca1 2604 struct net *net = dev_net(idev->dev);
929c9cf3 2605 int scope, plen;
f0e2acfa 2606 u32 pflags = 0;
1da177e4
LT		 2607
2608 ASSERT_RTNL();
2609
2610 memset(&addr, 0, sizeof(struct in6_addr));
2611 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2612
2613 if (idev->dev->flags&IFF_POINTOPOINT) {
2614 addr.s6_addr32[0] = htonl(0xfe800000);
2615 scope = IFA_LINK;
929c9cf3 2616 plen = 64;
1da177e4
LT		 2617 } else {
2618 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2619 plen = 96;
f0e2acfa 2620 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2621 }
2622
2623 if (addr.s6_addr32[3]) {
929c9cf3 2624 add_addr(idev, &addr, plen, scope);
f0e2acfa 2625 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2626 return;
2627 }
2628
6fda7350 2629 for_each_netdev(net, dev) {
8e5e8f30 2630 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2631 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2632 struct in_ifaddr *ifa;
1da177e4
LT		 2633
2634 int flag = scope;
2635
2636 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2637
2638 addr.s6_addr32[3] = ifa->ifa_local;
2639
2640 if (ifa->ifa_scope == RT_SCOPE_LINK)
2641 continue;
2642 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2643 if (idev->dev->flags&IFF_POINTOPOINT)
2644 continue;
2645 flag |= IFA_HOST;
2646 }
1da177e4 2647
b5f348e5 2648 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2649 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2650 pflags);
1da177e4
LT		 2651 }
2652 }
1ab1457c 2653 }
1da177e4 2654}
0be669bb 2655#endif
1da177e4
LT		 2656
2657static void init_loopback(struct net_device *dev)
2658{
2659 struct inet6_dev *idev;
25fb6ca4
BK		 2660 struct net_device *sp_dev;
2661 struct inet6_ifaddr *sp_ifa;
2662 struct rt6_info *sp_rt;
1da177e4
LT		 2663
2664 /* ::1 */
2665
2666 ASSERT_RTNL();
2667
7eaa48a4 2668 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2669 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2670 return;
2671 }
2672
b5f348e5 2673 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2674
2675 /* Add routes to other interface's IPv6 addresses */
2676 for_each_netdev(dev_net(dev), sp_dev) {
2677 if (!strcmp(sp_dev->name, dev->name))
2678 continue;
2679
2680 idev = __in6_dev_get(sp_dev);
2681 if (!idev)
2682 continue;
2683
2684 read_lock_bh(&idev->lock);
2685 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2686
2687 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2688 continue;
2689
33d99113
G		 2690 if (sp_ifa->rt) {
2691 /* This dst has been added to garbage list when
2692 * lo device down, release this obsolete dst and
2693 * reallocate a new router for ifa.
2694 */
2695 if (sp_ifa->rt->dst.obsolete > 0) {
2696 ip6_rt_put(sp_ifa->rt);
2697 sp_ifa->rt = NULL;
2698 } else {
2699 continue;
2700 }
2701 }
a881ae1f 2702
57ec0afe 2703 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 2704
2705 /* Failure cases are ignored */
534c8779
G		 2706 if (!IS_ERR(sp_rt)) {
2707 sp_ifa->rt = sp_rt;
25fb6ca4 2708 ip6_ins_rt(sp_rt);
534c8779 2709 }
25fb6ca4
BK		 2710 }
2711 read_unlock_bh(&idev->lock);
2712 }
1da177e4
LT		 2713}
2714
b71d1d42 2715static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4 2716{
8e5e8f30 2717 struct inet6_ifaddr *ifp;
95c385b4
NH		 2718 u32 addr_flags = IFA_F_PERMANENT;
2719
2720#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2721 if (idev->cnf.optimistic_dad &&
702beb87 2722 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2723 addr_flags |= IFA_F_OPTIMISTIC;
2724#endif
1da177e4 2725
95c385b4 2726
07edd741
HFS		 2727 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2728 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 2729 if (!IS_ERR(ifp)) {
46d48046 2730 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2731 addrconf_dad_start(ifp);
1da177e4
LT		 2732 in6_ifa_put(ifp);
2733 }
2734}
2735
2736static void addrconf_dev_config(struct net_device *dev)
2737{
2738 struct in6_addr addr;
8e5e8f30 2739 struct inet6_dev *idev;
1da177e4
LT		 2740
2741 ASSERT_RTNL();
2742
74235a25
HX		 2743 if ((dev->type != ARPHRD_ETHER) &&
2744 (dev->type != ARPHRD_FDDI) &&
74235a25 2745 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 2746 (dev->type != ARPHRD_INFINIBAND) &&
cb6bf355 2747 (dev->type != ARPHRD_IEEE802154) &&
e837735e 2748 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8
JR		 2749 (dev->type != ARPHRD_TUNNEL6) &&
2750 (dev->type != ARPHRD_6LOWPAN)) {
74235a25
HX		 2751 /* Alas, we support only Ethernet autoconfiguration. */
2752 return;
2753 }
2754
1da177e4 2755 idev = addrconf_add_dev(dev);
64e724f6 2756 if (IS_ERR(idev))
1da177e4
LT		 2757 return;
2758
2759 memset(&addr, 0, sizeof(struct in6_addr));
2760 addr.s6_addr32[0] = htonl(0xFE800000);
2761
2762 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2763 addrconf_add_linklocal(idev, &addr);
2764}
2765
07a93626 2766#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2767static void addrconf_sit_config(struct net_device *dev)
2768{
2769 struct inet6_dev *idev;
2770
2771 ASSERT_RTNL();
2772
1ab1457c
YH		 2773 /*
2774 * Configure the tunnel with one of our IPv4
2775 * addresses... we should configure all of
1da177e4
LT		 2776 * our v4 addrs in the tunnel
2777 */
2778
7eaa48a4 2779 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2780 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2781 return;
2782 }
2783
c7dc89c0
FT		 2784 if (dev->priv_flags & IFF_ISATAP) {
2785 struct in6_addr addr;
2786
2787 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
c7dc89c0
FT		 2788 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2789 addrconf_add_linklocal(idev, &addr);
2790 return;
2791 }
2792
1da177e4
LT		 2793 sit_add_v4_addrs(idev);
2794
62b54dd9 2795 if (dev->flags&IFF_POINTOPOINT)
1da177e4 2796 addrconf_add_mroute(dev);
1da177e4 2797}
0be669bb 2798#endif
1da177e4 2799
07a93626 2800#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2801static void addrconf_gre_config(struct net_device *dev)
2802{
2803 struct inet6_dev *idev;
2804 struct in6_addr addr;
2805
aee80b54 2806 ASSERT_RTNL();
2807
7eaa48a4 2808 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2809 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 2810 return;
2811 }
2812
2813 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
aee80b54 2814 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2815 addrconf_add_linklocal(idev, &addr);
08b44656
ND		 2816 else
2817 addrconf_prefix_route(&addr, 64, dev, 0, 0);
aee80b54 2818}
2819#endif
2820
1ab1457c 2821static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 2822 void *ptr)
1da177e4 2823{
351638e7 2824 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 2825 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2826 int run_pending = 0;
b217d616 2827 int err;
1da177e4 2828
e21e8467 2829 switch (event) {
45ba9dd2 2830 case NETDEV_REGISTER:
74235a25 2831 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2832 idev = ipv6_add_dev(dev);
2833 if (!idev)
b217d616 2834 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2835 }
2836 break;
bcdd553f 2837
1da177e4 2838 case NETDEV_UP:
3c21edbd 2839 case NETDEV_CHANGE:
c2edacf8
JV		 2840 if (dev->flags & IFF_SLAVE)
2841 break;
2842
3c21edbd 2843 if (event == NETDEV_UP) {
f24e3d65 2844 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 2845 /* device is not ready yet. */
f3213831 2846 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 2847 dev->name);
2848 break;
2849 }
99081049 2850
d31c7b8f
EP		 2851 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2852 idev = ipv6_add_dev(dev);
2853
e3ec6cfc 2854 if (idev) {
99081049 2855 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2856 run_pending = 1;
2857 }
3c21edbd 2858 } else {
f24e3d65 2859 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2860 /* device is still not ready. */
2861 break;
2862 }
2863
2864 if (idev) {
bcdd553f 2865 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2866 /* device is already configured. */
2867 break;
3c21edbd
YH		 2868 idev->if_flags |= IF_READY;
2869 }
2870
f3213831
JP		 2871 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2872 dev->name);
3c21edbd 2873
c5e33bdd 2874 run_pending = 1;
3c21edbd
YH		 2875 }
2876
e21e8467 2877 switch (dev->type) {
07a93626 2878#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2879 case ARPHRD_SIT:
2880 addrconf_sit_config(dev);
2881 break;
aee80b54 2882#endif
07a93626 2883#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2884 case ARPHRD_IPGRE:
2885 addrconf_gre_config(dev);
2886 break;
0be669bb 2887#endif
1da177e4
LT		 2888 case ARPHRD_LOOPBACK:
2889 init_loopback(dev);
2890 break;
2891
2892 default:
2893 addrconf_dev_config(dev);
2894 break;
3ff50b79 2895 }
bcdd553f 2896
1da177e4 2897 if (idev) {
c5e33bdd
YH		 2898 if (run_pending)
2899 addrconf_dad_run(idev);
2900
bcdd553f
SH		 2901 /*
2902 * If the MTU changed during the interface down,
2903 * when the interface up, the changed MTU must be
2904 * reflected in the idev as well as routers.
1da177e4 2905 */
bcdd553f
SH		 2906 if (idev->cnf.mtu6 != dev->mtu &&
2907 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2908 rt6_mtu_change(dev, dev->mtu);
2909 idev->cnf.mtu6 = dev->mtu;
2910 }
2911 idev->tstamp = jiffies;
2912 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2913
2914 /*
2915 * If the changed mtu during down is lower than
2916 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2917 */
2918 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2919 addrconf_ifdown(dev, 1);
1da177e4
LT		 2920 }
2921 break;
2922
2923 case NETDEV_CHANGEMTU:
d31c7b8f 2924 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2925 rt6_mtu_change(dev, dev->mtu);
2926 idev->cnf.mtu6 = dev->mtu;
2927 break;
2928 }
2929
d31c7b8f
EP		 2930 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2931 idev = ipv6_add_dev(dev);
2932 if (idev)
2933 break;
2934 }
2935
bcdd553f 2936 /*
db9c7c39 2937 * if MTU under IPV6_MIN_MTU.
bcdd553f
SH		 2938 * Stop IPv6 on this interface.
2939 */
1da177e4
LT		 2940
2941 case NETDEV_DOWN:
2942 case NETDEV_UNREGISTER:
2943 /*
2944 * Remove all addresses from this interface.
2945 */
2946 addrconf_ifdown(dev, event != NETDEV_DOWN);
2947 break;
3c21edbd 2948
1da177e4 2949 case NETDEV_CHANGENAME:
1da177e4 2950 if (idev) {
5632c515 2951 snmp6_unregister_dev(idev);
408c4768 2952 addrconf_sysctl_unregister(idev);
f52295a9 2953 addrconf_sysctl_register(idev);
b217d616
HX		 2954 err = snmp6_register_dev(idev);
2955 if (err)
2956 return notifier_from_errno(err);
5632c515 2957 }
1da177e4 2958 break;
bcdd553f 2959
93d9b7d7
JP		 2960 case NETDEV_PRE_TYPE_CHANGE:
2961 case NETDEV_POST_TYPE_CHANGE:
2962 addrconf_type_change(dev, event);
75c78500 2963 break;
3ff50b79 2964 }
1da177e4
LT		 2965
2966 return NOTIFY_OK;
2967}
2968
2969/*
2970 * addrconf module should be notified of a device going up
2971 */
2972static struct notifier_block ipv6_dev_notf = {
2973 .notifier_call = addrconf_notify,
1da177e4
LT		 2974};
2975
93d9b7d7 2976static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2977{
2978 struct inet6_dev *idev;
2979 ASSERT_RTNL();
2980
2981 idev = __in6_dev_get(dev);
2982
93d9b7d7 2983 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2984 ipv6_mc_remap(idev);
93d9b7d7 2985 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2986 ipv6_mc_unmap(idev);
2987}
2988
1da177e4
LT		 2989static int addrconf_ifdown(struct net_device *dev, int how)
2990{
c346dca1 2991 struct net *net = dev_net(dev);
502a2ffd 2992 struct inet6_dev *idev;
2993 struct inet6_ifaddr *ifa;
73a8bd74 2994 int state, i;
1da177e4
LT		 2995
2996 ASSERT_RTNL();
2997
73a8bd74
DM		 2998 rt6_ifdown(net, dev);
2999 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3000
3001 idev = __in6_dev_get(dev);
3002 if (idev == NULL)
3003 return -ENODEV;
3004
bcdd553f
SH		 3005 /*
3006 * Step 1: remove reference to ipv6 device from parent device.
3007 * Do not dev_put!
1da177e4 3008 */
439e2385 3009 if (how) {
1da177e4 3010 idev->dead = 1;
8814c4b5
YH		 3011
3012 /* protected by rtnl_lock */
a9b3cd7f 3013 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3014
3015 /* Step 1.5: remove snmp6 entry */
3016 snmp6_unregister_dev(idev);
3017
3018 }
3019
73a8bd74
DM		 3020 /* Step 2: clear hash table */
3021 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3022 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3023
3024 spin_lock_bh(&addrconf_hash_lock);
3025 restart:
b67bfe0d 3026 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74
DM		 3027 if (ifa->idev == idev) {
3028 hlist_del_init_rcu(&ifa->addr_lst);
c15b1cca 3029 addrconf_del_dad_work(ifa);
73a8bd74
DM		 3030 goto restart;
3031 }
3032 }
3033 spin_unlock_bh(&addrconf_hash_lock);
3034 }
3035
1da177e4
LT		 3036 write_lock_bh(&idev->lock);
3037
b7b1bfce
HFS		 3038 addrconf_del_rs_timer(idev);
3039
bcdd553f 3040 /* Step 2: clear flags for stateless addrconf */
439e2385 3041 if (!how)
3c21edbd 3042 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3043
439e2385 3044 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 3045 in6_dev_put(idev);
3046
bcdd553f 3047 /* Step 3: clear tempaddr list */
372e6c8f 3048 while (!list_empty(&idev->tempaddr_list)) {
3049 ifa = list_first_entry(&idev->tempaddr_list,
3050 struct inet6_ifaddr, tmp_list);
3051 list_del(&ifa->tmp_list);
1da177e4
LT		 3052 write_unlock_bh(&idev->lock);
3053 spin_lock_bh(&ifa->lock);
3054
3055 if (ifa->ifpub) {
3056 in6_ifa_put(ifa->ifpub);
3057 ifa->ifpub = NULL;
3058 }
3059 spin_unlock_bh(&ifa->lock);
3060 in6_ifa_put(ifa);
3061 write_lock_bh(&idev->lock);
3062 }
8f37ada5 3063
502a2ffd 3064 while (!list_empty(&idev->addr_list)) {
3065 ifa = list_first_entry(&idev->addr_list,
3066 struct inet6_ifaddr, if_list);
c15b1cca 3067 addrconf_del_dad_work(ifa);
84e8b803 3068
73a8bd74 3069 list_del(&ifa->if_list);
84e8b803 3070
73a8bd74 3071 write_unlock_bh(&idev->lock);
84e8b803 3072
73a8bd74
DM		 3073 spin_lock_bh(&ifa->state_lock);
3074 state = ifa->state;
3075 ifa->state = INET6_IFADDR_STATE_DEAD;
3076 spin_unlock_bh(&ifa->state_lock);
9d82ca98 3077
73a8bd74
DM		 3078 if (state != INET6_IFADDR_STATE_DEAD) {
3079 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3080 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 3081 }
73a8bd74 3082 in6_ifa_put(ifa);
8f37ada5 3083
73a8bd74
DM		 3084 write_lock_bh(&idev->lock);
3085 }
8f37ada5 3086
1da177e4
LT		 3087 write_unlock_bh(&idev->lock);
3088
3089 /* Step 5: Discard multicast list */
439e2385 3090 if (how)
1da177e4
LT		 3091 ipv6_mc_destroy_dev(idev);
3092 else
3093 ipv6_mc_down(idev);
3094
1da177e4 3095 idev->tstamp = jiffies;
1ab1457c 3096
bcdd553f 3097 /* Last: Shot the device (if unregistered) */
439e2385 3098 if (how) {
408c4768 3099 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3100 neigh_parms_release(&nd_tbl, idev->nd_parms);
3101 neigh_ifdown(&nd_tbl, dev);
3102 in6_dev_put(idev);
3103 }
3104 return 0;
3105}
3106
3107static void addrconf_rs_timer(unsigned long data)
3108{
b7b1bfce 3109 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3110 struct net_device *dev = idev->dev;
b7b1bfce 3111 struct in6_addr lladdr;
1da177e4 3112
b7b1bfce 3113 write_lock(&idev->lock);
5b2a1953 3114 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3115 goto out;
3116
9ba2add3 3117 if (!ipv6_accept_ra(idev))
5b2a1953 3118 goto out;
3119
3120 /* Announcement received after solicitation was sent */
3121 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3122 goto out;
1da177e4 3123
b7b1bfce 3124 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
caf92bc4
CW		 3125 write_unlock(&idev->lock);
3126 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3127 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3128 &in6addr_linklocal_allrouters);
3129 else
caf92bc4 3130 goto put;
1da177e4 3131
caf92bc4 3132 write_lock(&idev->lock);
b7b1bfce
HFS		 3133 /* The wait after the last probe can be shorter */
3134 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3135 idev->cnf.rtr_solicits) ?
3136 idev->cnf.rtr_solicit_delay :
3137 idev->cnf.rtr_solicit_interval);
1da177e4 3138 } else {
1da177e4
LT		 3139 /*
3140 * Note: we do not support deprecated "all on-link"
3141 * assumption any longer.
3142 */
91df42be 3143 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3144 }
3145
3146out:
b7b1bfce 3147 write_unlock(&idev->lock);
caf92bc4 3148put:
b7b1bfce 3149 in6_dev_put(idev);
1da177e4
LT		 3150}
3151
3152/*
3153 * Duplicate Address Detection
3154 */
3c21edbd
YH		 3155static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3156{
3157 unsigned long rand_num;
3158 struct inet6_dev *idev = ifp->idev;
3159
95c385b4
NH		 3160 if (ifp->flags & IFA_F_OPTIMISTIC)
3161 rand_num = 0;
3162 else
63862b5b 3163 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3164
b7b1bfce 3165 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3166 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3167}
3168
c15b1cca 3169static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3170{
3171 struct inet6_dev *idev = ifp->idev;
3172 struct net_device *dev = idev->dev;
1da177e4
LT		 3173
3174 addrconf_join_solict(dev, &ifp->addr);
3175
63862b5b 3176 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3177
3178 read_lock_bh(&idev->lock);
622ccdf1 3179 spin_lock(&ifp->lock);
e9d3e084 3180 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3181 goto out;
1da177e4
LT		 3182
3183 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3184 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3185 !(ifp->flags&IFA_F_TENTATIVE) ||
3186 ifp->flags & IFA_F_NODAD) {
cc411d0b 3187 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3188 spin_unlock(&ifp->lock);
1da177e4
LT		 3189 read_unlock_bh(&idev->lock);
3190
3191 addrconf_dad_completed(ifp);
3192 return;
3193 }
3194
6732bade 3195 if (!(idev->if_flags & IF_READY)) {
21809faf 3196 spin_unlock(&ifp->lock);
6732bade 3197 read_unlock_bh(&idev->lock);
3c21edbd 3198 /*
590a9887 3199 * If the device is not ready:
3c21edbd
YH		 3200 * - keep it tentative if it is a permanent address.
3201 * - otherwise, kill it.
3202 */
3203 in6_ifa_hold(ifp);
cc411d0b 3204 addrconf_dad_stop(ifp, 0);
6732bade 3205 return;
3c21edbd 3206 }
95c385b4
NH		 3207
3208 /*
3209 * Optimistic nodes can start receiving
3210 * Frames right away
3211 */
e21e8467 3212 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 3213 ip6_ins_rt(ifp->rt);
3214
6732bade 3215 addrconf_dad_kick(ifp);
1da177e4 3216out:
622ccdf1 3217 spin_unlock(&ifp->lock);
1da177e4
LT		 3218 read_unlock_bh(&idev->lock);
3219}
3220
c15b1cca 3221static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3222{
c15b1cca
HFS		 3223 bool begin_dad = false;
3224
3225 spin_lock_bh(&ifp->state_lock);
3226 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3227 ifp->state = INET6_IFADDR_STATE_PREDAD;
3228 begin_dad = true;
3229 }
3230 spin_unlock_bh(&ifp->state_lock);
3231
3232 if (begin_dad)
3233 addrconf_mod_dad_work(ifp, 0);
3234}
3235
3236static void addrconf_dad_work(struct work_struct *w)
3237{
3238 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3239 struct inet6_ifaddr,
3240 dad_work);
1da177e4 3241 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3242 struct in6_addr mcaddr;
3243
c15b1cca
HFS		 3244 enum {
3245 DAD_PROCESS,
3246 DAD_BEGIN,
3247 DAD_ABORT,
3248 } action = DAD_PROCESS;
3249
3250 rtnl_lock();
3251
3252 spin_lock_bh(&ifp->state_lock);
3253 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3254 action = DAD_BEGIN;
3255 ifp->state = INET6_IFADDR_STATE_DAD;
3256 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3257 action = DAD_ABORT;
3258 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3259 }
3260 spin_unlock_bh(&ifp->state_lock);
3261
3262 if (action == DAD_BEGIN) {
3263 addrconf_dad_begin(ifp);
3264 goto out;
3265 } else if (action == DAD_ABORT) {
3266 addrconf_dad_stop(ifp, 1);
3267 goto out;
3268 }
3269
b7b1bfce 3270 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3271 goto out;
3272
c15b1cca 3273 write_lock_bh(&idev->lock);
122e4519 3274 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3275 write_unlock_bh(&idev->lock);
1da177e4
LT		 3276 goto out;
3277 }
21809faf 3278
3279 spin_lock(&ifp->lock);
622ccdf1
HX		 3280 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3281 spin_unlock(&ifp->lock);
c15b1cca 3282 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3283 goto out;
3284 }
3285
b7b1bfce 3286 if (ifp->dad_probes == 0) {
1da177e4
LT		 3287 /*
3288 * DAD was successful
3289 */
3290
cc411d0b 3291 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3292 spin_unlock(&ifp->lock);
c15b1cca 3293 write_unlock_bh(&idev->lock);
1da177e4
LT		 3294
3295 addrconf_dad_completed(ifp);
3296
3297 goto out;
3298 }
3299
b7b1bfce 3300 ifp->dad_probes--;
c15b1cca
HFS		 3301 addrconf_mod_dad_work(ifp,
3302 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3303 spin_unlock(&ifp->lock);
c15b1cca 3304 write_unlock_bh(&idev->lock);
1da177e4
LT		 3305
3306 /* send a neighbour solicitation for our addr */
1da177e4 3307 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3308 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3309out:
3310 in6_ifa_put(ifp);
c15b1cca 3311 rtnl_unlock();
1da177e4
LT		 3312}
3313
11ffff75
HFS		 3314/* ifp->idev must be at least read locked */
3315static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3316{
3317 struct inet6_ifaddr *ifpiter;
3318 struct inet6_dev *idev = ifp->idev;
3319
602582ca
HFS		 3320 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3321 if (ifpiter->scope > IFA_LINK)
3322 break;
11ffff75
HFS		 3323 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3324 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3325 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3326 IFA_F_PERMANENT)
3327 return false;
3328 }
3329 return true;
3330}
3331
1da177e4
LT		 3332static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3333{
e21e8467 3334 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3335 struct in6_addr lladdr;
b173ee48 3336 bool send_rs, send_mld;
b7b1bfce 3337
c15b1cca 3338 addrconf_del_dad_work(ifp);
1da177e4
LT		 3339
3340 /*
3341 * Configure the address for reception. Now it is valid.
3342 */
3343
3344 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3345
026359bc
TA		 3346 /* If added prefix is link local and we are prepared to process
3347 router advertisements, start sending router solicitations.
1da177e4
LT		 3348 */
3349
1ec047eb 3350 read_lock_bh(&ifp->idev->lock);
11ffff75 3351 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 3352 send_rs = send_mld &&
3353 ipv6_accept_ra(ifp->idev) &&
1ec047eb 3354 ifp->idev->cnf.rtr_solicits > 0 &&
b173ee48 3355 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 3356 read_unlock_bh(&ifp->idev->lock);
3357
b173ee48
HFS		 3358 /* While dad is in progress mld report's source address is in6_addrany.
3359 * Resend with proper ll now.
3360 */
3361 if (send_mld)
3362 ipv6_mc_dad_complete(ifp->idev);
3363
1ec047eb 3364 if (send_rs) {
1da177e4
LT		 3365 /*
3366 * If a host as already performed a random delay
3367 * [...] as part of DAD [...] there is no need
3368 * to delay again before sending the first RS
3369 */
1ec047eb 3370 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 3371 return;
1ec047eb 3372 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 3373
b7b1bfce
HFS		 3374 write_lock_bh(&ifp->idev->lock);
3375 spin_lock(&ifp->lock);
3376 ifp->idev->rs_probes = 1;
1da177e4 3377 ifp->idev->if_flags |= IF_RS_SENT;
b7b1bfce
HFS		 3378 addrconf_mod_rs_timer(ifp->idev,
3379 ifp->idev->cnf.rtr_solicit_interval);
3380 spin_unlock(&ifp->lock);
3381 write_unlock_bh(&ifp->idev->lock);
1da177e4
LT		 3382 }
3383}
3384
e21e8467
SH		 3385static void addrconf_dad_run(struct inet6_dev *idev)
3386{
c5e33bdd
YH		 3387 struct inet6_ifaddr *ifp;
3388
3389 read_lock_bh(&idev->lock);
502a2ffd 3390 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3391 spin_lock(&ifp->lock);
f2344a13
HX		 3392 if (ifp->flags & IFA_F_TENTATIVE &&
3393 ifp->state == INET6_IFADDR_STATE_DAD)
3394 addrconf_dad_kick(ifp);
21809faf 3395 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3396 }
3397 read_unlock_bh(&idev->lock);
3398}
3399
1da177e4
LT		 3400#ifdef CONFIG_PROC_FS
3401struct if6_iter_state {
3c40090a 3402 struct seq_net_private p;
1da177e4 3403 int bucket;
1d578303 3404 int offset;
1da177e4
LT		 3405};
3406
1d578303 3407static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3408{
3409 struct inet6_ifaddr *ifa = NULL;
3410 struct if6_iter_state *state = seq->private;
1218854a 3411 struct net *net = seq_file_net(seq);
1d578303 3412 int p = 0;
1da177e4 3413
1d578303
MM		 3414 /* initial bucket if pos is 0 */
3415 if (pos == 0) {
3416 state->bucket = 0;
3417 state->offset = 0;
3418 }
3419
3420 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3421 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3422 addr_lst) {
9f0d3c27
ED		 3423 if (!net_eq(dev_net(ifa->idev->dev), net))
3424 continue;
1d578303
MM		 3425 /* sync with offset */
3426 if (p < state->offset) {
3427 p++;
3428 continue;
3429 }
3430 state->offset++;
9f0d3c27 3431 return ifa;
1d578303
MM		 3432 }
3433
3434 /* prepare for next bucket */
3435 state->offset = 0;
3436 p = 0;
1da177e4 3437 }
c2e21293 3438 return NULL;
1da177e4
LT		 3439}
3440
c2e21293 3441static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3442 struct inet6_ifaddr *ifa)
1da177e4
LT		 3443{
3444 struct if6_iter_state *state = seq->private;
1218854a 3445 struct net *net = seq_file_net(seq);
1da177e4 3446
b67bfe0d 3447 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3448 if (!net_eq(dev_net(ifa->idev->dev), net))
3449 continue;
1d578303 3450 state->offset++;
9f0d3c27 3451 return ifa;
1d578303 3452 }
3c40090a 3453
c2e21293 3454 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3455 state->offset = 0;
b67bfe0d 3456 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3457 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3458 if (!net_eq(dev_net(ifa->idev->dev), net))
3459 continue;
1d578303 3460 state->offset++;
9f0d3c27 3461 return ifa;
c2e21293 3462 }
1da177e4 3463 }
3c40090a 3464
c2e21293 3465 return NULL;
1da177e4
LT		 3466}
3467
1da177e4 3468static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3469 __acquires(rcu_bh)
1da177e4 3470{
5c578aed 3471 rcu_read_lock_bh();
1d578303 3472 return if6_get_first(seq, *pos);
1da177e4
LT		 3473}
3474
3475static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3476{
3477 struct inet6_ifaddr *ifa;
3478
3479 ifa = if6_get_next(seq, v);
3480 ++*pos;
3481 return ifa;
3482}
3483
3484static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3485 __releases(rcu_bh)
1da177e4 3486{
5c578aed 3487 rcu_read_unlock_bh();
1da177e4
LT		 3488}
3489
3490static int if6_seq_show(struct seq_file *seq, void *v)
3491{
3492 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 3493 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3494 &ifp->addr,
1da177e4
LT		 3495 ifp->idev->dev->ifindex,
3496 ifp->prefix_len,
3497 ifp->scope,
971a351c 3498 (u8) ifp->flags,
1da177e4
LT		 3499 ifp->idev->dev->name);
3500 return 0;
3501}
3502
56b3d975 3503static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3504 .start = if6_seq_start,
3505 .next = if6_seq_next,
3506 .show = if6_seq_show,
3507 .stop = if6_seq_stop,
3508};
3509
3510static int if6_seq_open(struct inode *inode, struct file *file)
3511{
3c40090a
DL		 3512 return seq_open_net(inode, file, &if6_seq_ops,
3513 sizeof(struct if6_iter_state));
1da177e4
LT		 3514}
3515
9a32144e 3516static const struct file_operations if6_fops = {
1da177e4
LT		 3517 .owner = THIS_MODULE,
3518 .open = if6_seq_open,
3519 .read = seq_read,
3520 .llseek = seq_lseek,
3c40090a 3521 .release = seq_release_net,
1da177e4
LT		 3522};
3523
2c8c1e72 3524static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3525{
d4beaa66 3526 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 3527 return -ENOMEM;
3528 return 0;
3529}
3530
2c8c1e72 3531static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 3532{
ece31ffd 3533 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 3534}
3535
3536static struct pernet_operations if6_proc_net_ops = {
3537 .init = if6_proc_net_init,
3538 .exit = if6_proc_net_exit,
3539};
3540
3541int __init if6_proc_init(void)
3542{
3543 return register_pernet_subsys(&if6_proc_net_ops);
3544}
3545
1da177e4
LT		 3546void if6_proc_exit(void)
3547{
3c40090a 3548 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3549}
3550#endif /* CONFIG_PROC_FS */
3551
07a93626 3552#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3553/* Check if address is a home address configured on any interface. */
b71d1d42 3554int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3555{
3556 int ret = 0;
c2e21293 3557 struct inet6_ifaddr *ifp = NULL;
ddbe5032 3558 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3559
5c578aed 3560 rcu_read_lock_bh();
b67bfe0d 3561 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 3562 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3563 continue;
caad295f 3564 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3565 (ifp->flags & IFA_F_HOMEADDRESS)) {
3566 ret = 1;
3567 break;
3568 }
3569 }
5c578aed 3570 rcu_read_unlock_bh();
3b9f9a1c
NT		 3571 return ret;
3572}
3573#endif
3574
1da177e4
LT		 3575/*
3576 * Periodic address status verification
3577 */
3578
c15b1cca 3579static void addrconf_verify_rtnl(void)
1da177e4 3580{
b2db7564 3581 unsigned long now, next, next_sec, next_sched;
1da177e4 3582 struct inet6_ifaddr *ifp;
1da177e4
LT		 3583 int i;
3584
c15b1cca
HFS		 3585 ASSERT_RTNL();
3586
5c578aed 3587 rcu_read_lock_bh();
1da177e4 3588 now = jiffies;
b2db7564 3589 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 3590
c15b1cca 3591 cancel_delayed_work(&addr_chk_work);
1da177e4 3592
bcdd553f 3593 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3594restart:
c15b1cca 3595 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 3596 unsigned long age;
1da177e4 3597
fad8da3e
YA		 3598 /* When setting preferred_lft to a value not zero or
3599 * infinity, while valid_lft is infinity
3600 * IFA_F_PERMANENT has a non-infinity life time.
3601 */
3602 if ((ifp->flags & IFA_F_PERMANENT) &&
3603 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 3604 continue;
3605
3606 spin_lock(&ifp->lock);
b2db7564
YH		 3607 /* We try to batch several events at once. */
3608 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3609
8f27ebb9
YH		 3610 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3611 age >= ifp->valid_lft) {
1da177e4
LT		 3612 spin_unlock(&ifp->lock);
3613 in6_ifa_hold(ifp);
1da177e4
LT		 3614 ipv6_del_addr(ifp);
3615 goto restart;
8f27ebb9
YH		 3616 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3617 spin_unlock(&ifp->lock);
3618 continue;
1da177e4 3619 } else if (age >= ifp->prefered_lft) {
a1ed0526 3620 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3621 int deprecate = 0;
3622
3623 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3624 deprecate = 1;
3625 ifp->flags |= IFA_F_DEPRECATED;
3626 }
3627
fad8da3e
YA		 3628 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3629 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 3630 next = ifp->tstamp + ifp->valid_lft * HZ;
3631
3632 spin_unlock(&ifp->lock);
3633
3634 if (deprecate) {
3635 in6_ifa_hold(ifp);
1da177e4
LT		 3636
3637 ipv6_ifa_notify(0, ifp);
3638 in6_ifa_put(ifp);
3639 goto restart;
3640 }
1da177e4
LT		 3641 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3642 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3643 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3644 ifp->idev->cnf.dad_transmits *
1f9248e5 3645 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 3646
1da177e4
LT		 3647 if (age >= ifp->prefered_lft - regen_advance) {
3648 struct inet6_ifaddr *ifpub = ifp->ifpub;
3649 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3650 next = ifp->tstamp + ifp->prefered_lft * HZ;
3651 if (!ifp->regen_count && ifpub) {
3652 ifp->regen_count++;
3653 in6_ifa_hold(ifp);
3654 in6_ifa_hold(ifpub);
3655 spin_unlock(&ifp->lock);
5c578aed 3656
291d809b
HY		 3657 spin_lock(&ifpub->lock);
3658 ifpub->regen_count = 0;
3659 spin_unlock(&ifpub->lock);
1da177e4
LT		 3660 ipv6_create_tempaddr(ifpub, ifp);
3661 in6_ifa_put(ifpub);
3662 in6_ifa_put(ifp);
3663 goto restart;
3664 }
3665 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3666 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3667 spin_unlock(&ifp->lock);
1da177e4
LT		 3668 } else {
3669 /* ifp->prefered_lft <= ifp->valid_lft */
3670 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3671 next = ifp->tstamp + ifp->prefered_lft * HZ;
3672 spin_unlock(&ifp->lock);
3673 }
3674 }
1da177e4
LT		 3675 }
3676
b2db7564
YH		 3677 next_sec = round_jiffies_up(next);
3678 next_sched = next;
3679
3680 /* If rounded timeout is accurate enough, accept it. */
3681 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3682 next_sched = next_sec;
3683
3684 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3685 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3686 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3687
ba3542e1 3688 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3689 now, next, next_sec, next_sched);
c15b1cca 3690 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 3691 rcu_read_unlock_bh();
1da177e4
LT		 3692}
3693
c15b1cca
HFS		 3694static void addrconf_verify_work(struct work_struct *w)
3695{
3696 rtnl_lock();
3697 addrconf_verify_rtnl();
3698 rtnl_unlock();
3699}
3700
3701static void addrconf_verify(void)
3702{
3703 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
3704}
3705
caeaba79
ND		 3706static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3707 struct in6_addr **peer_pfx)
461d8837
TG		 3708{
3709 struct in6_addr *pfx = NULL;
3710
caeaba79
ND		 3711 *peer_pfx = NULL;
3712
461d8837
TG		 3713 if (addr)
3714 pfx = nla_data(addr);
3715
3716 if (local) {
3717 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 3718 *peer_pfx = pfx;
3719 pfx = nla_data(local);
461d8837
TG		 3720 }
3721
3722 return pfx;
3723}
3724
ef7c79ed 3725static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3726 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3727 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3728 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 3729 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 3730};
3731
1da177e4 3732static int
661d2967 3733inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3734{
3b1e0a65 3735 struct net *net = sock_net(skb->sk);
b933f716
TG		 3736 struct ifaddrmsg *ifm;
3737 struct nlattr *tb[IFA_MAX+1];
caeaba79 3738 struct in6_addr *pfx, *peer_pfx;
6046d5b4 3739 u32 ifa_flags;
b933f716 3740 int err;
1da177e4 3741
b933f716
TG		 3742 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3743 if (err < 0)
3744 return err;
3745
3746 ifm = nlmsg_data(nlh);
caeaba79 3747 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3748 if (pfx == NULL)
3749 return -EINVAL;
3750
6046d5b4
HK		 3751 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3752
3753 /* We ignore other flags so far. */
3754 ifa_flags &= IFA_F_MANAGETEMPADDR;
3755
3756 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
3757 ifm->ifa_prefixlen);
1da177e4
LT		 3758}
3759
479840ff 3760static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 3761 u32 prefered_lft, u32 valid_lft)
081bba5b 3762{
6f704992
YH		 3763 u32 flags;
3764 clock_t expires;
4bed72e4 3765 unsigned long timeout;
53bd6749 3766 bool was_managetempaddr;
5b84efec 3767 bool had_prefixroute;
46d48046 3768
c15b1cca
HFS		 3769 ASSERT_RTNL();
3770
081bba5b
NT		 3771 if (!valid_lft || (prefered_lft > valid_lft))
3772 return -EINVAL;
3773
53bd6749
JP		 3774 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
3775 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
3776 return -EINVAL;
3777
4bed72e4
YH		 3778 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3779 if (addrconf_finite_timeout(timeout)) {
3780 expires = jiffies_to_clock_t(timeout * HZ);
3781 valid_lft = timeout;
6f704992 3782 flags = RTF_EXPIRES;
4bed72e4
YH		 3783 } else {
3784 expires = 0;
3785 flags = 0;
3786 ifa_flags |= IFA_F_PERMANENT;
6f704992 3787 }
081bba5b 3788
4bed72e4
YH		 3789 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3790 if (addrconf_finite_timeout(timeout)) {
3791 if (timeout == 0)
3792 ifa_flags |= IFA_F_DEPRECATED;
3793 prefered_lft = timeout;
3794 }
081bba5b
NT		 3795
3796 spin_lock_bh(&ifp->lock);
53bd6749 3797 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 3798 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
3799 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 3800 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 3801 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3802 IFA_F_NOPREFIXROUTE);
53bd6749 3803 ifp->flags |= ifa_flags;
081bba5b
NT		 3804 ifp->tstamp = jiffies;
3805 ifp->valid_lft = valid_lft;
3806 ifp->prefered_lft = prefered_lft;
3807
3808 spin_unlock_bh(&ifp->lock);
3809 if (!(ifp->flags&IFA_F_TENTATIVE))
3810 ipv6_ifa_notify(0, ifp);
081bba5b 3811
761aac73
TH		 3812 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
3813 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3814 expires, flags);
5b84efec
TH		 3815 } else if (had_prefixroute) {
3816 enum cleanup_prefix_rt_t action;
3817 unsigned long rt_expires;
3818
3819 write_lock_bh(&ifp->idev->lock);
3820 action = check_cleanup_prefix_route(ifp, &rt_expires);
3821 write_unlock_bh(&ifp->idev->lock);
3822
3823 if (action != CLEANUP_PREFIX_RT_NOP) {
3824 cleanup_prefix_route(ifp, rt_expires,
3825 action == CLEANUP_PREFIX_RT_DEL);
3826 }
761aac73 3827 }
53bd6749
JP		 3828
3829 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
3830 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
3831 valid_lft = prefered_lft = 0;
3832 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
3833 !was_managetempaddr, jiffies);
3834 }
3835
c15b1cca 3836 addrconf_verify_rtnl();
081bba5b
NT		 3837
3838 return 0;
3839}
3840
1da177e4 3841static int
661d2967 3842inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3843{
3b1e0a65 3844 struct net *net = sock_net(skb->sk);
461d8837
TG		 3845 struct ifaddrmsg *ifm;
3846 struct nlattr *tb[IFA_MAX+1];
caeaba79 3847 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 3848 struct inet6_ifaddr *ifa;
3849 struct net_device *dev;
55ebaef1 3850 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 3851 u32 ifa_flags;
461d8837 3852 int err;
1da177e4 3853
461d8837
TG		 3854 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3855 if (err < 0)
3856 return err;
3857
3858 ifm = nlmsg_data(nlh);
caeaba79 3859 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3860 if (pfx == NULL)
3861 return -EINVAL;
3862
461d8837 3863 if (tb[IFA_CACHEINFO]) {
0778769d 3864 struct ifa_cacheinfo *ci;
461d8837
TG		 3865
3866 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3867 valid_lft = ci->ifa_valid;
461d8837
TG		 3868 preferred_lft = ci->ifa_prefered;
3869 } else {
3870 preferred_lft = INFINITY_LIFE_TIME;
3871 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3872 }
3873
af284937 3874 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3875 if (dev == NULL)
3876 return -ENODEV;
3877
479840ff
JP		 3878 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3879
55ebaef1 3880 /* We ignore other flags so far. */
761aac73
TH		 3881 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3882 IFA_F_NOPREFIXROUTE;
55ebaef1 3883
1cab3da6 3884 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3885 if (ifa == NULL) {
3886 /*
3887 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 3888 * userspace already relies on not having to provide this.
7198f8ce 3889 */
caeaba79 3890 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 3891 ifm->ifa_prefixlen, ifa_flags,
3892 preferred_lft, valid_lft);
081bba5b
NT		 3893 }
3894
7198f8ce
TG		 3895 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3896 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3897 err = -EEXIST;
3898 else
55ebaef1 3899 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3900
3901 in6_ifa_put(ifa);
3902
3903 return err;
1da177e4
LT		 3904}
3905
479840ff 3906static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 3907 u8 scope, int ifindex)
3908{
3909 struct ifaddrmsg *ifm;
3910
3911 ifm = nlmsg_data(nlh);
3912 ifm->ifa_family = AF_INET6;
3913 ifm->ifa_prefixlen = prefixlen;
3914 ifm->ifa_flags = flags;
3915 ifm->ifa_scope = scope;
3916 ifm->ifa_index = ifindex;
3917}
3918
85486af0
TG		 3919static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3920 unsigned long tstamp, u32 preferred, u32 valid)
3921{
3922 struct ifa_cacheinfo ci;
3923
18a31e1e
TG		 3924 ci.cstamp = cstamp_delta(cstamp);
3925 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 3926 ci.ifa_prefered = preferred;
3927 ci.ifa_valid = valid;
3928
3929 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3930}
3931
101bb229
TG		 3932static inline int rt_scope(int ifa_scope)
3933{
3934 if (ifa_scope & IFA_HOST)
3935 return RT_SCOPE_HOST;
3936 else if (ifa_scope & IFA_LINK)
3937 return RT_SCOPE_LINK;
3938 else if (ifa_scope & IFA_SITE)
3939 return RT_SCOPE_SITE;
3940 else
3941 return RT_SCOPE_UNIVERSE;
3942}
3943
0ab6803b
TG		 3944static inline int inet6_ifaddr_msgsize(void)
3945{
339bf98f 3946 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 3947 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 3948 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 3949 + nla_total_size(sizeof(struct ifa_cacheinfo))
3950 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 3951}
c5396a31 3952
1da177e4 3953static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 3954 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3955{
1da177e4 3956 struct nlmsghdr *nlh;
85486af0 3957 u32 preferred, valid;
1da177e4 3958
15e47304 3959 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3960 if (nlh == NULL)
26932566 3961 return -EMSGSIZE;
0ab6803b 3962
101bb229
TG		 3963 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3964 ifa->idev->dev->ifindex);
3965
fad8da3e
YA		 3966 if (!((ifa->flags&IFA_F_PERMANENT) &&
3967 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 3968 preferred = ifa->prefered_lft;
3969 valid = ifa->valid_lft;
3970 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3971 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3972 if (preferred > tval)
3973 preferred -= tval;
3974 else
3975 preferred = 0;
f56619fc
BH		 3976 if (valid != INFINITY_LIFE_TIME) {
3977 if (valid > tval)
3978 valid -= tval;
3979 else
3980 valid = 0;
3981 }
1da177e4
LT		 3982 }
3983 } else {
85486af0
TG		 3984 preferred = INFINITY_LIFE_TIME;
3985 valid = INFINITY_LIFE_TIME;
3986 }
3987
7996c799 3988 if (!ipv6_addr_any(&ifa->peer_addr)) {
caeaba79
ND		 3989 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3990 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3991 goto error;
3992 } else
3993 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3994 goto error;
3995
3996 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3997 goto error;
1da177e4 3998
479840ff
JP		 3999 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4000 goto error;
4001
0ab6803b 4002 return nlmsg_end(skb, nlh);
caeaba79
ND		 4003
4004error:
4005 nlmsg_cancel(skb, nlh);
4006 return -EMSGSIZE;
1da177e4
LT		 4007}
4008
4009static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4010 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4011{
1da177e4 4012 struct nlmsghdr *nlh;
101bb229
TG		 4013 u8 scope = RT_SCOPE_UNIVERSE;
4014 int ifindex = ifmca->idev->dev->ifindex;
4015
4016 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4017 scope = RT_SCOPE_SITE;
1da177e4 4018
15e47304 4019 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 4020 if (nlh == NULL)
26932566 4021 return -EMSGSIZE;
85486af0 4022
0ab6803b
TG		 4023 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4024 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
4025 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4026 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4027 nlmsg_cancel(skb, nlh);
4028 return -EMSGSIZE;
4029 }
85486af0 4030
0ab6803b 4031 return nlmsg_end(skb, nlh);
1da177e4
LT		 4032}
4033
4034static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4035 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4036{
1da177e4 4037 struct nlmsghdr *nlh;
101bb229
TG		 4038 u8 scope = RT_SCOPE_UNIVERSE;
4039 int ifindex = ifaca->aca_idev->dev->ifindex;
4040
4041 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4042 scope = RT_SCOPE_SITE;
1da177e4 4043
15e47304 4044 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 4045 if (nlh == NULL)
26932566 4046 return -EMSGSIZE;
85486af0 4047
0ab6803b
TG		 4048 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4049 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
4050 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4051 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4052 nlmsg_cancel(skb, nlh);
4053 return -EMSGSIZE;
4054 }
1da177e4 4055
0ab6803b 4056 return nlmsg_end(skb, nlh);
1da177e4
LT		 4057}
4058
e21e8467 4059enum addr_type_t {
1da177e4
LT		 4060 UNICAST_ADDR,
4061 MULTICAST_ADDR,
4062 ANYCAST_ADDR,
4063};
4064
234b27c3
ED		 4065/* called with rcu_read_lock() */
4066static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4067 struct netlink_callback *cb, enum addr_type_t type,
4068 int s_ip_idx, int *p_ip_idx)
4069{
234b27c3
ED		 4070 struct ifmcaddr6 *ifmca;
4071 struct ifacaddr6 *ifaca;
4072 int err = 1;
4073 int ip_idx = *p_ip_idx;
4074
4075 read_lock_bh(&idev->lock);
4076 switch (type) {
502a2ffd 4077 case UNICAST_ADDR: {
4078 struct inet6_ifaddr *ifa;
4079
234b27c3 4080 /* unicast address incl. temp addr */
502a2ffd 4081 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4082 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4083 continue;
4084 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4085 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4086 cb->nlh->nlmsg_seq,
4087 RTM_NEWADDR,
4088 NLM_F_MULTI);
4089 if (err <= 0)
4090 break;
63998ac2 4091 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4092 }
4093 break;
502a2ffd 4094 }
234b27c3
ED		 4095 case MULTICAST_ADDR:
4096 /* multicast address */
4097 for (ifmca = idev->mc_list; ifmca;
4098 ifmca = ifmca->next, ip_idx++) {
4099 if (ip_idx < s_ip_idx)
4100 continue;
4101 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4102 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4103 cb->nlh->nlmsg_seq,
4104 RTM_GETMULTICAST,
4105 NLM_F_MULTI);
4106 if (err <= 0)
4107 break;
4108 }
4109 break;
4110 case ANYCAST_ADDR:
4111 /* anycast address */
4112 for (ifaca = idev->ac_list; ifaca;
4113 ifaca = ifaca->aca_next, ip_idx++) {
4114 if (ip_idx < s_ip_idx)
4115 continue;
4116 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4117 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4118 cb->nlh->nlmsg_seq,
4119 RTM_GETANYCAST,
4120 NLM_F_MULTI);
4121 if (err <= 0)
4122 break;
4123 }
4124 break;
4125 default:
4126 break;
4127 }
4128 read_unlock_bh(&idev->lock);
4129 *p_ip_idx = ip_idx;
4130 return err;
4131}
4132
1da177e4
LT		 4133static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4134 enum addr_type_t type)
4135{
234b27c3
ED		 4136 struct net *net = sock_net(skb->sk);
4137 int h, s_h;
1da177e4
LT		 4138 int idx, ip_idx;
4139 int s_idx, s_ip_idx;
1da177e4 4140 struct net_device *dev;
234b27c3
ED		 4141 struct inet6_dev *idev;
4142 struct hlist_head *head;
1ab1457c 4143
234b27c3
ED		 4144 s_h = cb->args[0];
4145 s_idx = idx = cb->args[1];
4146 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4147
234b27c3 4148 rcu_read_lock();
63998ac2 4149 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4150 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4151 idx = 0;
4152 head = &net->dev_index_head[h];
b67bfe0d 4153 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4154 if (idx < s_idx)
4155 goto cont;
4b97efdf 4156 if (h > s_h || idx > s_idx)
234b27c3
ED		 4157 s_ip_idx = 0;
4158 ip_idx = 0;
e21e8467
SH		 4159 idev = __in6_dev_get(dev);
4160 if (!idev)
234b27c3
ED		 4161 goto cont;
4162
4163 if (in6_dump_addrs(idev, skb, cb, type,
4164 s_ip_idx, &ip_idx) <= 0)
4165 goto done;
7562f876 4166cont:
234b27c3
ED		 4167 idx++;
4168 }
1da177e4 4169 }
234b27c3
ED		 4170done:
4171 rcu_read_unlock();
4172 cb->args[0] = h;
4173 cb->args[1] = idx;
4174 cb->args[2] = ip_idx;
4175
1da177e4
LT		 4176 return skb->len;
4177}
4178
4179static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4180{
4181 enum addr_type_t type = UNICAST_ADDR;
b854272b 4182
1da177e4
LT		 4183 return inet6_dump_addr(skb, cb, type);
4184}
4185
4186static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4187{
4188 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4189
1da177e4
LT		 4190 return inet6_dump_addr(skb, cb, type);
4191}
4192
4193
4194static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4195{
4196 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4197
1da177e4
LT		 4198 return inet6_dump_addr(skb, cb, type);
4199}
4200
661d2967 4201static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4202{
3b1e0a65 4203 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4204 struct ifaddrmsg *ifm;
4205 struct nlattr *tb[IFA_MAX+1];
caeaba79 4206 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4207 struct net_device *dev = NULL;
4208 struct inet6_ifaddr *ifa;
4209 struct sk_buff *skb;
6c223828
NT		 4210 int err;
4211
1b29fc2c
TG		 4212 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4213 if (err < 0)
4214 goto errout;
4215
caeaba79 4216 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
1b29fc2c
TG		 4217 if (addr == NULL) {
4218 err = -EINVAL;
4219 goto errout;
6c223828 4220 }
6c223828 4221
1b29fc2c 4222 ifm = nlmsg_data(nlh);
6c223828 4223 if (ifm->ifa_index)
6fda7350 4224 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4225
e21e8467
SH		 4226 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4227 if (!ifa) {
1b29fc2c
TG		 4228 err = -EADDRNOTAVAIL;
4229 goto errout;
4230 }
6c223828 4231
e21e8467
SH		 4232 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4233 if (!skb) {
6c223828 4234 err = -ENOBUFS;
1b29fc2c 4235 goto errout_ifa;
6c223828
NT		 4236 }
4237
15e47304 4238 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4239 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4240 if (err < 0) {
4241 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4242 WARN_ON(err == -EMSGSIZE);
4243 kfree_skb(skb);
4244 goto errout_ifa;
4245 }
15e47304 4246 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4247errout_ifa:
6c223828 4248 in6_ifa_put(ifa);
1b29fc2c 4249errout:
6c223828 4250 return err;
6c223828
NT		 4251}
4252
1da177e4
LT		 4253static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4254{
4255 struct sk_buff *skb;
c346dca1 4256 struct net *net = dev_net(ifa->idev->dev);
5d620266 4257 int err = -ENOBUFS;
1da177e4 4258
0ab6803b 4259 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 4260 if (skb == NULL)
4261 goto errout;
4262
4263 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4264 if (err < 0) {
4265 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4266 WARN_ON(err == -EMSGSIZE);
4267 kfree_skb(skb);
4268 goto errout;
4269 }
1ce85fe4
PNA		 4270 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4271 return;
5d620266
TG		 4272errout:
4273 if (err < 0)
6fda7350 4274 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4275}
4276
b6f99a21 4277static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4278 __s32 *array, int bytes)
4279{
04561c1f
TG		 4280 BUG_ON(bytes < (DEVCONF_MAX * 4));
4281
1da177e4
LT		 4282 memset(array, 0, bytes);
4283 array[DEVCONF_FORWARDING] = cnf->forwarding;
4284 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4285 array[DEVCONF_MTU6] = cnf->mtu6;
4286 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4287 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4288 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4289 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4290 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4291 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4292 jiffies_to_msecs(cnf->rtr_solicit_interval);
4293 array[DEVCONF_RTR_SOLICIT_DELAY] =
4294 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4295 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4296 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4297 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4298 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4299 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4300 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4301 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4302 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4303 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4304 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4305 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4306 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 4307 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4308#ifdef CONFIG_IPV6_ROUTER_PREF
4309 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4310 array[DEVCONF_RTR_PROBE_INTERVAL] =
4311 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4312#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4313 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4314#endif
930d6ff2 4315#endif
fbea49e1 4316 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4317 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4318#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4319 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4320#endif
7bc570c8
YH		 4321#ifdef CONFIG_IPV6_MROUTE
4322 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4323#endif
778d80be 4324 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4325 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4326 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4327 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 4328 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
1da177e4
LT		 4329}
4330
b382b191
TG		 4331static inline size_t inet6_ifla6_size(void)
4332{
4333 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4334 + nla_total_size(sizeof(struct ifla_cacheinfo))
4335 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4336 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4337 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4338 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4339}
4340
339bf98f
TG		 4341static inline size_t inet6_if_nlmsg_size(void)
4342{
4343 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4344 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4345 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4346 + nla_total_size(4) /* IFLA_MTU */
4347 + nla_total_size(4) /* IFLA_LINK */
b382b191 4348 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4349}
c5396a31 4350
be281e55 4351static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4352 int items, int bytes)
7f7d9a6b
HX		 4353{
4354 int i;
4355 int pad = bytes - sizeof(u64) * items;
4356 BUG_ON(pad < 0);
4357
4358 /* Use put_unaligned() because stats may not be aligned for u64. */
4359 put_unaligned(items, &stats[0]);
4360 for (i = 1; i < items; i++)
be281e55 4361 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4362
4363 memset(&stats[items], 0, pad);
4364}
4365
4ce3c183
ED		 4366static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4367 int items, int bytes, size_t syncpoff)
4368{
4369 int i;
4370 int pad = bytes - sizeof(u64) * items;
4371 BUG_ON(pad < 0);
4372
4373 /* Use put_unaligned() because stats may not be aligned for u64. */
4374 put_unaligned(items, &stats[0]);
4375 for (i = 1; i < items; i++)
4376 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4377
4378 memset(&stats[items], 0, pad);
4379}
4380
7f7d9a6b
HX		 4381static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4382 int bytes)
4383{
e21e8467 4384 switch (attrtype) {
7f7d9a6b 4385 case IFLA_INET6_STATS:
4ce3c183
ED		 4386 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4387 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4388 break;
4389 case IFLA_INET6_ICMP6STATS:
be281e55 4390 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4391 break;
4392 }
4393}
4394
b382b191
TG		 4395static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4396{
4397 struct nlattr *nla;
4398 struct ifla_cacheinfo ci;
4399
c78679e8
DM		 4400 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4401 goto nla_put_failure;
b382b191 4402 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4403 ci.tstamp = cstamp_delta(idev->tstamp);
4404 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 4405 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 4406 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4407 goto nla_put_failure;
b382b191
TG		 4408 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4409 if (nla == NULL)
4410 goto nla_put_failure;
4411 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4412
4413 /* XXX - MC not implemented */
4414
4415 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4416 if (nla == NULL)
4417 goto nla_put_failure;
4418 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4419
4420 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4421 if (nla == NULL)
4422 goto nla_put_failure;
4423 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4424
f53adae4
DB		 4425 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4426 if (nla == NULL)
4427 goto nla_put_failure;
4428 read_lock_bh(&idev->lock);
4429 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4430 read_unlock_bh(&idev->lock);
4431
b382b191
TG		 4432 return 0;
4433
4434nla_put_failure:
4435 return -EMSGSIZE;
4436}
4437
4438static size_t inet6_get_link_af_size(const struct net_device *dev)
4439{
4440 if (!__in6_dev_get(dev))
4441 return 0;
4442
4443 return inet6_ifla6_size();
4444}
4445
4446static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4447{
4448 struct inet6_dev *idev = __in6_dev_get(dev);
4449
4450 if (!idev)
4451 return -ENODATA;
4452
4453 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4454 return -EMSGSIZE;
4455
4456 return 0;
4457}
4458
f53adae4
DB		 4459static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4460{
f53adae4
DB		 4461 struct inet6_ifaddr *ifp;
4462 struct net_device *dev = idev->dev;
fc403832 4463 bool update_rs = false;
dc848292 4464 struct in6_addr ll_addr;
f53adae4 4465
c15b1cca
HFS		 4466 ASSERT_RTNL();
4467
f53adae4
DB		 4468 if (token == NULL)
4469 return -EINVAL;
4470 if (ipv6_addr_any(token))
4471 return -EINVAL;
4472 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4473 return -EINVAL;
f53adae4
DB		 4474 if (!ipv6_accept_ra(idev))
4475 return -EINVAL;
4476 if (idev->cnf.rtr_solicits <= 0)
4477 return -EINVAL;
4478
4479 write_lock_bh(&idev->lock);
4480
4481 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4482 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4483
4484 write_unlock_bh(&idev->lock);
4485
dc848292
HFS		 4486 if (!idev->dead && (idev->if_flags & IF_READY) &&
4487 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4488 IFA_F_OPTIMISTIC)) {
fc403832
DB		 4489
4490 /* If we're not ready, then normal ifup will take care
4491 * of this. Otherwise, we need to request our rs here.
4492 */
4493 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4494 update_rs = true;
4495 }
f53adae4
DB		 4496
4497 write_lock_bh(&idev->lock);
fc403832 4498
77ecaace 4499 if (update_rs) {
fc403832 4500 idev->if_flags |= IF_RS_SENT;
77ecaace
HFS		 4501 idev->rs_probes = 1;
4502 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4503 }
f53adae4
DB		 4504
4505 /* Well, that's kinda nasty ... */
4506 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4507 spin_lock(&ifp->lock);
617fe29d 4508 if (ifp->tokenized) {
f53adae4
DB		 4509 ifp->valid_lft = 0;
4510 ifp->prefered_lft = 0;
4511 }
4512 spin_unlock(&ifp->lock);
4513 }
4514
4515 write_unlock_bh(&idev->lock);
c15b1cca 4516 addrconf_verify_rtnl();
f53adae4
DB		 4517 return 0;
4518}
4519
4520static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4521{
4522 int err = -EINVAL;
4523 struct inet6_dev *idev = __in6_dev_get(dev);
4524 struct nlattr *tb[IFLA_INET6_MAX + 1];
4525
4526 if (!idev)
4527 return -EAFNOSUPPORT;
4528
4529 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4530 BUG();
4531
4532 if (tb[IFLA_INET6_TOKEN])
4533 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4534
4535 return err;
4536}
4537
1ab1457c 4538static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4539 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4540{
04561c1f 4541 struct net_device *dev = idev->dev;
04561c1f
TG		 4542 struct ifinfomsg *hdr;
4543 struct nlmsghdr *nlh;
4544 void *protoinfo;
04561c1f 4545
15e47304 4546 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
04561c1f 4547 if (nlh == NULL)
26932566 4548 return -EMSGSIZE;
04561c1f
TG		 4549
4550 hdr = nlmsg_data(nlh);
4551 hdr->ifi_family = AF_INET6;
4552 hdr->__ifi_pad = 0;
4553 hdr->ifi_type = dev->type;
4554 hdr->ifi_index = dev->ifindex;
4555 hdr->ifi_flags = dev_get_flags(dev);
4556 hdr->ifi_change = 0;
4557
c78679e8
DM		 4558 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4559 (dev->addr_len &&
4560 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4561 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4562 (dev->ifindex != dev->iflink &&
4563 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4564 goto nla_put_failure;
04561c1f
TG		 4565 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4566 if (protoinfo == NULL)
4567 goto nla_put_failure;
1da177e4 4568
b382b191 4569 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4570 goto nla_put_failure;
1da177e4 4571
04561c1f
TG		 4572 nla_nest_end(skb, protoinfo);
4573 return nlmsg_end(skb, nlh);
1da177e4 4574
04561c1f 4575nla_put_failure:
26932566
PM		 4576 nlmsg_cancel(skb, nlh);
4577 return -EMSGSIZE;
1da177e4
LT		 4578}
4579
4580static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4581{
3b1e0a65 4582 struct net *net = sock_net(skb->sk);
84d2697d 4583 int h, s_h;
434a8a58 4584 int idx = 0, s_idx;
1da177e4
LT		 4585 struct net_device *dev;
4586 struct inet6_dev *idev;
84d2697d 4587 struct hlist_head *head;
1da177e4 4588
84d2697d
ED		 4589 s_h = cb->args[0];
4590 s_idx = cb->args[1];
4591
4592 rcu_read_lock();
4593 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4594 idx = 0;
4595 head = &net->dev_index_head[h];
b67bfe0d 4596 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 4597 if (idx < s_idx)
4598 goto cont;
4599 idev = __in6_dev_get(dev);
4600 if (!idev)
4601 goto cont;
4602 if (inet6_fill_ifinfo(skb, idev,
15e47304 4603 NETLINK_CB(cb->skb).portid,
84d2697d
ED		 4604 cb->nlh->nlmsg_seq,
4605 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4606 goto out;
7562f876 4607cont:
84d2697d
ED		 4608 idx++;
4609 }
1da177e4 4610 }
84d2697d
ED		 4611out:
4612 rcu_read_unlock();
4613 cb->args[1] = idx;
4614 cb->args[0] = h;
1da177e4
LT		 4615
4616 return skb->len;
4617}
4618
4619void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4620{
4621 struct sk_buff *skb;
c346dca1 4622 struct net *net = dev_net(idev->dev);
8d7a76c9 4623 int err = -ENOBUFS;
1ab1457c 4624
339bf98f 4625 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4626 if (skb == NULL)
4627 goto errout;
4628
4629 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4630 if (err < 0) {
4631 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4632 WARN_ON(err == -EMSGSIZE);
4633 kfree_skb(skb);
4634 goto errout;
4635 }
5f75a104 4636 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4637 return;
8d7a76c9
TG		 4638errout:
4639 if (err < 0)
5f75a104 4640 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4641}
4642
339bf98f
TG		 4643static inline size_t inet6_prefix_nlmsg_size(void)
4644{
4645 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4646 + nla_total_size(sizeof(struct in6_addr))
4647 + nla_total_size(sizeof(struct prefix_cacheinfo));
4648}
c5396a31 4649
1da177e4 4650static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4651 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 4652 int event, unsigned int flags)
1da177e4 4653{
6051e2f4
TG		 4654 struct prefixmsg *pmsg;
4655 struct nlmsghdr *nlh;
1da177e4
LT		 4656 struct prefix_cacheinfo ci;
4657
15e47304 4658 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6051e2f4 4659 if (nlh == NULL)
26932566 4660 return -EMSGSIZE;
6051e2f4
TG		 4661
4662 pmsg = nlmsg_data(nlh);
1da177e4 4663 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4664 pmsg->prefix_pad1 = 0;
4665 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4666 pmsg->prefix_ifindex = idev->dev->ifindex;
4667 pmsg->prefix_len = pinfo->prefix_len;
4668 pmsg->prefix_type = pinfo->type;
8a47077a 4669 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4670 pmsg->prefix_flags = 0;
4671 if (pinfo->onlink)
4672 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4673 if (pinfo->autoconf)
4674 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4675
c78679e8
DM		 4676 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4677 goto nla_put_failure;
1da177e4
LT		 4678 ci.preferred_time = ntohl(pinfo->prefered);
4679 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 4680 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4681 goto nla_put_failure;
6051e2f4 4682 return nlmsg_end(skb, nlh);
1da177e4 4683
6051e2f4 4684nla_put_failure:
26932566
PM		 4685 nlmsg_cancel(skb, nlh);
4686 return -EMSGSIZE;
1da177e4
LT		 4687}
4688
1ab1457c 4689static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4690 struct prefix_info *pinfo)
4691{
4692 struct sk_buff *skb;
c346dca1 4693 struct net *net = dev_net(idev->dev);
8c384bfa 4694 int err = -ENOBUFS;
1da177e4 4695
339bf98f 4696 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4697 if (skb == NULL)
4698 goto errout;
4699
4700 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4701 if (err < 0) {
4702 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4703 WARN_ON(err == -EMSGSIZE);
4704 kfree_skb(skb);
4705 goto errout;
4706 }
1ce85fe4
PNA		 4707 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4708 return;
8c384bfa
TG		 4709errout:
4710 if (err < 0)
6fda7350 4711 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4712}
4713
1da177e4
LT		 4714static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4715{
63998ac2
ND		 4716 struct net *net = dev_net(ifp->idev->dev);
4717
c15b1cca
HFS		 4718 if (event)
4719 ASSERT_RTNL();
4720
1da177e4
LT		 4721 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4722
4723 switch (event) {
4724 case RTM_NEWADDR:
95c385b4
NH		 4725 /*
4726 * If the address was optimistic
4727 * we inserted the route at the start of
4728 * our DAD process, so we don't need
4729 * to do it again
4730 */
4731 if (!(ifp->rt->rt6i_node))
4732 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4733 if (ifp->idev->cnf.forwarding)
4734 addrconf_join_anycast(ifp);
7996c799 4735 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 4736 addrconf_prefix_route(&ifp->peer_addr, 128,
4737 ifp->idev->dev, 0, 0);
1da177e4
LT		 4738 break;
4739 case RTM_DELADDR:
4740 if (ifp->idev->cnf.forwarding)
4741 addrconf_leave_anycast(ifp);
4742 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 4743 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79
ND		 4744 struct rt6_info *rt;
4745 struct net_device *dev = ifp->idev->dev;
4746
4747 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4748 dev->ifindex, 1);
4749 if (rt) {
4750 dst_hold(&rt->dst);
4751 if (ip6_del_rt(rt))
4752 dst_free(&rt->dst);
4753 }
4754 }
d8d1f30b 4755 dst_hold(&ifp->rt->dst);
93fa159a 4756
73a8bd74 4757 if (ip6_del_rt(ifp->rt))
d8d1f30b 4758 dst_free(&ifp->rt->dst);
1da177e4
LT		 4759 break;
4760 }
63998ac2 4761 atomic_inc(&net->ipv6.dev_addr_genid);
439677d7 4762 rt_genid_bump_ipv6(net);
1da177e4
LT		 4763}
4764
4765static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4766{
8814c4b5 4767 rcu_read_lock_bh();
1da177e4
LT		 4768 if (likely(ifp->idev->dead == 0))
4769 __ipv6_ifa_notify(event, ifp);
8814c4b5 4770 rcu_read_unlock_bh();
1da177e4
LT		 4771}
4772
4773#ifdef CONFIG_SYSCTL
4774
4775static
fe2c6338 4776int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 4777 void __user *buffer, size_t *lenp, loff_t *ppos)
4778{
4779 int *valp = ctl->data;
4780 int val = *valp;
88af182e 4781 loff_t pos = *ppos;
fe2c6338 4782 struct ctl_table lctl;
1da177e4
LT		 4783 int ret;
4784
013d97e9
FR		 4785 /*
4786 * ctl->data points to idev->cnf.forwarding, we should
4787 * not modify it until we get the rtnl lock.
4788 */
4789 lctl = *ctl;
4790 lctl.data = &val;
4791
4792 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 4793
c8fecf22 4794 if (write)
b325fddb 4795 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4796 if (ret)
4797 *ppos = pos;
1ab1457c 4798 return ret;
1da177e4
LT		 4799}
4800
56d417b1
BH		 4801static void dev_disable_change(struct inet6_dev *idev)
4802{
75538c2b
CW		 4803 struct netdev_notifier_info info;
4804
56d417b1
BH		 4805 if (!idev || !idev->dev)
4806 return;
4807
75538c2b 4808 netdev_notifier_info_init(&info, idev->dev);
56d417b1 4809 if (idev->cnf.disable_ipv6)
75538c2b 4810 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 4811 else
75538c2b 4812 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 4813}
4814
4815static void addrconf_disable_change(struct net *net, __s32 newf)
4816{
4817 struct net_device *dev;
4818 struct inet6_dev *idev;
4819
c6d14c84
ED		 4820 rcu_read_lock();
4821 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4822 idev = __in6_dev_get(dev);
4823 if (idev) {
4824 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4825 idev->cnf.disable_ipv6 = newf;
4826 if (changed)
4827 dev_disable_change(idev);
4828 }
56d417b1 4829 }
c6d14c84 4830 rcu_read_unlock();
56d417b1
BH		 4831}
4832
013d97e9 4833static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 4834{
4835 struct net *net;
013d97e9
FR		 4836 int old;
4837
4838 if (!rtnl_trylock())
4839 return restart_syscall();
56d417b1
BH		 4840
4841 net = (struct net *)table->extra2;
013d97e9
FR		 4842 old = *p;
4843 *p = newf;
56d417b1 4844
013d97e9
FR		 4845 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4846 rtnl_unlock();
56d417b1 4847 return 0;
88af182e 4848 }
56d417b1
BH		 4849
4850 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 4851 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4852 addrconf_disable_change(net, newf);
013d97e9 4853 } else if ((!newf) ^ (!old))
56d417b1
BH		 4854 dev_disable_change((struct inet6_dev *)table->extra1);
4855
4856 rtnl_unlock();
4857 return 0;
4858}
4859
4860static
fe2c6338 4861int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 4862 void __user *buffer, size_t *lenp, loff_t *ppos)
4863{
4864 int *valp = ctl->data;
4865 int val = *valp;
88af182e 4866 loff_t pos = *ppos;
fe2c6338 4867 struct ctl_table lctl;
56d417b1
BH		 4868 int ret;
4869
013d97e9
FR		 4870 /*
4871 * ctl->data points to idev->cnf.disable_ipv6, we should
4872 * not modify it until we get the rtnl lock.
4873 */
4874 lctl = *ctl;
4875 lctl.data = &val;
4876
4877 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 4878
4879 if (write)
4880 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4881 if (ret)
4882 *ppos = pos;
56d417b1
BH		 4883 return ret;
4884}
4885
c92d5491 4886static
4887int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
4888 void __user *buffer, size_t *lenp, loff_t *ppos)
4889{
4890 int *valp = ctl->data;
4891 int ret;
4892 int old, new;
4893
4894 old = *valp;
4895 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4896 new = *valp;
4897
4898 if (write && old != new) {
4899 struct net *net = ctl->extra2;
4900
4901 if (!rtnl_trylock())
4902 return restart_syscall();
4903
4904 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
4905 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4906 NETCONFA_IFINDEX_DEFAULT,
4907 net->ipv6.devconf_dflt);
4908 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
4909 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4910 NETCONFA_IFINDEX_ALL,
4911 net->ipv6.devconf_all);
4912 else {
4913 struct inet6_dev *idev = ctl->extra1;
4914
4915 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4916 idev->dev->ifindex,
4917 &idev->cnf);
4918 }
4919 rtnl_unlock();
4920 }
4921
4922 return ret;
4923}
4924
4925
1da177e4
LT		 4926static struct addrconf_sysctl_table
4927{
4928 struct ctl_table_header *sysctl_header;
fe2c6338 4929 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 4930} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4931 .sysctl_header = NULL,
4932 .addrconf_vars = {
1ab1457c 4933 {
e21e8467
SH		 4934 .procname = "forwarding",
4935 .data = &ipv6_devconf.forwarding,
4936 .maxlen = sizeof(int),
4937 .mode = 0644,
4938 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4939 },
4940 {
e21e8467
SH		 4941 .procname = "hop_limit",
4942 .data = &ipv6_devconf.hop_limit,
4943 .maxlen = sizeof(int),
4944 .mode = 0644,
4945 .proc_handler = proc_dointvec,
1da177e4
LT		 4946 },
4947 {
e21e8467
SH		 4948 .procname = "mtu",
4949 .data = &ipv6_devconf.mtu6,
4950 .maxlen = sizeof(int),
4951 .mode = 0644,
4952 .proc_handler = proc_dointvec,
1da177e4
LT		 4953 },
4954 {
e21e8467
SH		 4955 .procname = "accept_ra",
4956 .data = &ipv6_devconf.accept_ra,
4957 .maxlen = sizeof(int),
4958 .mode = 0644,
4959 .proc_handler = proc_dointvec,
1da177e4
LT		 4960 },
4961 {
e21e8467
SH		 4962 .procname = "accept_redirects",
4963 .data = &ipv6_devconf.accept_redirects,
4964 .maxlen = sizeof(int),
4965 .mode = 0644,
4966 .proc_handler = proc_dointvec,
1da177e4
LT		 4967 },
4968 {
e21e8467
SH		 4969 .procname = "autoconf",
4970 .data = &ipv6_devconf.autoconf,
4971 .maxlen = sizeof(int),
4972 .mode = 0644,
4973 .proc_handler = proc_dointvec,
1da177e4
LT		 4974 },
4975 {
e21e8467
SH		 4976 .procname = "dad_transmits",
4977 .data = &ipv6_devconf.dad_transmits,
4978 .maxlen = sizeof(int),
4979 .mode = 0644,
4980 .proc_handler = proc_dointvec,
1da177e4
LT		 4981 },
4982 {
e21e8467
SH		 4983 .procname = "router_solicitations",
4984 .data = &ipv6_devconf.rtr_solicits,
4985 .maxlen = sizeof(int),
4986 .mode = 0644,
4987 .proc_handler = proc_dointvec,
1da177e4
LT		 4988 },
4989 {
e21e8467
SH		 4990 .procname = "router_solicitation_interval",
4991 .data = &ipv6_devconf.rtr_solicit_interval,
4992 .maxlen = sizeof(int),
4993 .mode = 0644,
4994 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4995 },
4996 {
e21e8467
SH		 4997 .procname = "router_solicitation_delay",
4998 .data = &ipv6_devconf.rtr_solicit_delay,
4999 .maxlen = sizeof(int),
5000 .mode = 0644,
5001 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5002 },
5003 {
e21e8467
SH		 5004 .procname = "force_mld_version",
5005 .data = &ipv6_devconf.force_mld_version,
5006 .maxlen = sizeof(int),
5007 .mode = 0644,
5008 .proc_handler = proc_dointvec,
1da177e4 5009 },
fc4eba58
HFS		 5010 {
5011 .procname = "mldv1_unsolicited_report_interval",
5012 .data =
5013 &ipv6_devconf.mldv1_unsolicited_report_interval,
5014 .maxlen = sizeof(int),
5015 .mode = 0644,
5016 .proc_handler = proc_dointvec_ms_jiffies,
5017 },
5018 {
5019 .procname = "mldv2_unsolicited_report_interval",
5020 .data =
5021 &ipv6_devconf.mldv2_unsolicited_report_interval,
5022 .maxlen = sizeof(int),
5023 .mode = 0644,
5024 .proc_handler = proc_dointvec_ms_jiffies,
5025 },
1da177e4 5026 {
e21e8467
SH		 5027 .procname = "use_tempaddr",
5028 .data = &ipv6_devconf.use_tempaddr,
5029 .maxlen = sizeof(int),
5030 .mode = 0644,
5031 .proc_handler = proc_dointvec,
1da177e4
LT		 5032 },
5033 {
e21e8467
SH		 5034 .procname = "temp_valid_lft",
5035 .data = &ipv6_devconf.temp_valid_lft,
5036 .maxlen = sizeof(int),
5037 .mode = 0644,
5038 .proc_handler = proc_dointvec,
1da177e4
LT		 5039 },
5040 {
e21e8467
SH		 5041 .procname = "temp_prefered_lft",
5042 .data = &ipv6_devconf.temp_prefered_lft,
5043 .maxlen = sizeof(int),
5044 .mode = 0644,
5045 .proc_handler = proc_dointvec,
1da177e4
LT		 5046 },
5047 {
e21e8467
SH		 5048 .procname = "regen_max_retry",
5049 .data = &ipv6_devconf.regen_max_retry,
5050 .maxlen = sizeof(int),
5051 .mode = 0644,
5052 .proc_handler = proc_dointvec,
1da177e4
LT		 5053 },
5054 {
e21e8467
SH		 5055 .procname = "max_desync_factor",
5056 .data = &ipv6_devconf.max_desync_factor,
5057 .maxlen = sizeof(int),
5058 .mode = 0644,
5059 .proc_handler = proc_dointvec,
1da177e4 5060 },
1da177e4 5061 {
e21e8467
SH		 5062 .procname = "max_addresses",
5063 .data = &ipv6_devconf.max_addresses,
5064 .maxlen = sizeof(int),
5065 .mode = 0644,
5066 .proc_handler = proc_dointvec,
1da177e4 5067 },
65f5c7c1 5068 {
e21e8467
SH		 5069 .procname = "accept_ra_defrtr",
5070 .data = &ipv6_devconf.accept_ra_defrtr,
5071 .maxlen = sizeof(int),
5072 .mode = 0644,
5073 .proc_handler = proc_dointvec,
65f5c7c1 5074 },
c4fd30eb 5075 {
e21e8467
SH		 5076 .procname = "accept_ra_pinfo",
5077 .data = &ipv6_devconf.accept_ra_pinfo,
5078 .maxlen = sizeof(int),
5079 .mode = 0644,
5080 .proc_handler = proc_dointvec,
c4fd30eb 5081 },
930d6ff2
YH		 5082#ifdef CONFIG_IPV6_ROUTER_PREF
5083 {
e21e8467
SH		 5084 .procname = "accept_ra_rtr_pref",
5085 .data = &ipv6_devconf.accept_ra_rtr_pref,
5086 .maxlen = sizeof(int),
5087 .mode = 0644,
5088 .proc_handler = proc_dointvec,
930d6ff2 5089 },
52e16356 5090 {
e21e8467
SH		 5091 .procname = "router_probe_interval",
5092 .data = &ipv6_devconf.rtr_probe_interval,
5093 .maxlen = sizeof(int),
5094 .mode = 0644,
5095 .proc_handler = proc_dointvec_jiffies,
52e16356 5096 },
fa03ef38 5097#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 5098 {
e21e8467
SH		 5099 .procname = "accept_ra_rt_info_max_plen",
5100 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5101 .maxlen = sizeof(int),
5102 .mode = 0644,
5103 .proc_handler = proc_dointvec,
09c884d4
YH		 5104 },
5105#endif
930d6ff2 5106#endif
fbea49e1 5107 {
e21e8467
SH		 5108 .procname = "proxy_ndp",
5109 .data = &ipv6_devconf.proxy_ndp,
5110 .maxlen = sizeof(int),
5111 .mode = 0644,
c92d5491 5112 .proc_handler = addrconf_sysctl_proxy_ndp,
fbea49e1 5113 },
0bcbc926 5114 {
e21e8467
SH		 5115 .procname = "accept_source_route",
5116 .data = &ipv6_devconf.accept_source_route,
5117 .maxlen = sizeof(int),
5118 .mode = 0644,
5119 .proc_handler = proc_dointvec,
0bcbc926 5120 },
95c385b4
NH		 5121#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5122 {
e21e8467
SH		 5123 .procname = "optimistic_dad",
5124 .data = &ipv6_devconf.optimistic_dad,
5125 .maxlen = sizeof(int),
5126 .mode = 0644,
5127 .proc_handler = proc_dointvec,
95c385b4
NH		 5128
5129 },
7bc570c8
YH		 5130#endif
5131#ifdef CONFIG_IPV6_MROUTE
5132 {
e21e8467
SH		 5133 .procname = "mc_forwarding",
5134 .data = &ipv6_devconf.mc_forwarding,
5135 .maxlen = sizeof(int),
5136 .mode = 0444,
5137 .proc_handler = proc_dointvec,
7bc570c8 5138 },
95c385b4 5139#endif
778d80be 5140 {
e21e8467
SH		 5141 .procname = "disable_ipv6",
5142 .data = &ipv6_devconf.disable_ipv6,
5143 .maxlen = sizeof(int),
5144 .mode = 0644,
5145 .proc_handler = addrconf_sysctl_disable,
778d80be 5146 },
1b34be74 5147 {
e21e8467
SH		 5148 .procname = "accept_dad",
5149 .data = &ipv6_devconf.accept_dad,
5150 .maxlen = sizeof(int),
5151 .mode = 0644,
5152 .proc_handler = proc_dointvec,
1b34be74 5153 },
f7734fdf 5154 {
f7734fdf
OP		 5155 .procname = "force_tllao",
5156 .data = &ipv6_devconf.force_tllao,
5157 .maxlen = sizeof(int),
5158 .mode = 0644,
5159 .proc_handler = proc_dointvec
5160 },
5cb04436
HFS		 5161 {
5162 .procname = "ndisc_notify",
5163 .data = &ipv6_devconf.ndisc_notify,
5164 .maxlen = sizeof(int),
5165 .mode = 0644,
5166 .proc_handler = proc_dointvec
5167 },
b800c3b9
HFS		 5168 {
5169 .procname = "suppress_frag_ndisc",
5170 .data = &ipv6_devconf.suppress_frag_ndisc,
5171 .maxlen = sizeof(int),
5172 .mode = 0644,
5173 .proc_handler = proc_dointvec
5174 },
1da177e4 5175 {
f8572d8f 5176 /* sentinel */
1da177e4
LT		 5177 }
5178 },
1da177e4
LT		 5179};
5180
bff16c2f 5181static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 5182 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 5183{
5184 int i;
1da177e4 5185 struct addrconf_sysctl_table *t;
6105e293 5186 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 5187
af879cc7 5188 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 5189 if (t == NULL)
f68635e6
PE		 5190 goto out;
5191
bcdd553f 5192 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 5193 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 5194 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 5195 t->addrconf_vars[i].extra2 = net;
1da177e4 5196 }
1da177e4 5197
6105e293 5198 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 5199
6105e293 5200 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
1da177e4 5201 if (t->sysctl_header == NULL)
6105e293 5202 goto free;
f68635e6
PE		 5203
5204 p->sysctl = t;
95897312 5205 return 0;
1da177e4 5206
f68635e6 5207free:
1da177e4 5208 kfree(t);
f68635e6 5209out:
95897312 5210 return -ENOBUFS;
1da177e4
LT		 5211}
5212
408c4768
PE		 5213static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5214{
5215 struct addrconf_sysctl_table *t;
5216
5217 if (p->sysctl == NULL)
5218 return;
5219
5220 t = p->sysctl;
5221 p->sysctl = NULL;
ff538818 5222 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 5223 kfree(t);
5224}
5225
f52295a9
PE		 5226static void addrconf_sysctl_register(struct inet6_dev *idev)
5227{
73af614a 5228 neigh_sysctl_register(idev->dev, idev->nd_parms,
f8572d8f 5229 &ndisc_ifinfo_sysctl_change);
c346dca1 5230 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 5231 idev, &idev->cnf);
f52295a9
PE		 5232}
5233
408c4768 5234static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 5235{
408c4768
PE		 5236 __addrconf_sysctl_unregister(&idev->cnf);
5237 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 5238}
5239
5240
5241#endif
5242
2c8c1e72 5243static int __net_init addrconf_init_net(struct net *net)
e0da5a48 5244{
a79ca223 5245 int err = -ENOMEM;
e0da5a48
PE		 5246 struct ipv6_devconf *all, *dflt;
5247
a79ca223
HZ		 5248 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5249 if (all == NULL)
5250 goto err_alloc_all;
e0da5a48 5251
a79ca223
HZ		 5252 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5253 if (dflt == NULL)
5254 goto err_alloc_dflt;
e0da5a48 5255
a79ca223
HZ		 5256 /* these will be inherited by all namespaces */
5257 dflt->autoconf = ipv6_defaults.autoconf;
5258 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 5259
5260 net->ipv6.devconf_all = all;
5261 net->ipv6.devconf_dflt = dflt;
5262
5263#ifdef CONFIG_SYSCTL
f8572d8f 5264 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 5265 if (err < 0)
5266 goto err_reg_all;
5267
f8572d8f 5268 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 5269 if (err < 0)
5270 goto err_reg_dflt;
5271#endif
5272 return 0;
5273
5274#ifdef CONFIG_SYSCTL
5275err_reg_dflt:
5276 __addrconf_sysctl_unregister(all);
5277err_reg_all:
5278 kfree(dflt);
5279#endif
5280err_alloc_dflt:
5281 kfree(all);
5282err_alloc_all:
5283 return err;
5284}
5285
2c8c1e72 5286static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 5287{
5288#ifdef CONFIG_SYSCTL
5289 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5290 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5291#endif
09ad9bc7 5292 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 5293 kfree(net->ipv6.devconf_dflt);
5294 kfree(net->ipv6.devconf_all);
5295 }
5296}
5297
5298static struct pernet_operations addrconf_ops = {
5299 .init = addrconf_init_net,
5300 .exit = addrconf_exit_net,
5301};
5302
b382b191
TG		 5303static struct rtnl_af_ops inet6_ops = {
5304 .family = AF_INET6,
5305 .fill_link_af = inet6_fill_link_af,
5306 .get_link_af_size = inet6_get_link_af_size,
f53adae4 5307 .set_link_af = inet6_set_link_af,
b382b191
TG		 5308};
5309
1da177e4
LT		 5310/*
5311 * Init / cleanup code
5312 */
5313
5314int __init addrconf_init(void)
5315{
c2e21293 5316 int i, err;
2a8cc6c8 5317
e21e8467
SH		 5318 err = ipv6_addr_label_init();
5319 if (err < 0) {
f3213831
JP		 5320 pr_crit("%s: cannot initialize default policy table: %d\n",
5321 __func__, err);
2cc6d2bf 5322 goto out;
2a8cc6c8 5323 }
1da177e4 5324
2cc6d2bf
NH		 5325 err = register_pernet_subsys(&addrconf_ops);
5326 if (err < 0)
5327 goto out_addrlabel;
e0da5a48 5328
c15b1cca
HFS		 5329 addrconf_wq = create_workqueue("ipv6_addrconf");
5330 if (!addrconf_wq) {
5331 err = -ENOMEM;
5332 goto out_nowq;
5333 }
5334
1da177e4
LT		 5335 /* The addrconf netdev notifier requires that loopback_dev
5336 * has it's ipv6 private information allocated and setup
5337 * before it can bring up and give link-local addresses
5338 * to other devices which are up.
5339 *
5340 * Unfortunately, loopback_dev is not necessarily the first
5341 * entry in the global dev_base list of net devices. In fact,
5342 * it is likely to be the very last entry on that list.
5343 * So this causes the notifier registry below to try and
5344 * give link-local addresses to all devices besides loopback_dev
5345 * first, then loopback_dev, which cases all the non-loopback_dev
5346 * devices to fail to get a link-local address.
5347 *
5348 * So, as a temporary fix, allocate the ipv6 structure for
5349 * loopback_dev first by hand.
5350 * Longer term, all of the dependencies ipv6 has upon the loopback
5351 * device and it being up should be removed.
5352 */
5353 rtnl_lock();
2774c7ab 5354 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 5355 err = -ENOMEM;
5356 rtnl_unlock();
5357 if (err)
e0da5a48 5358 goto errlo;
1da177e4 5359
c2e21293 5360 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5361 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5362
1da177e4
LT		 5363 register_netdevice_notifier(&ipv6_dev_notf);
5364
c15b1cca 5365 addrconf_verify();
c127ea2c 5366
3678a9d8 5367 rtnl_af_register(&inet6_ops);
b382b191 5368
c7ac8679
GR		 5369 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5370 NULL);
c127ea2c
TG		 5371 if (err < 0)
5372 goto errout;
5373
5374 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 5375 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5376 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5377 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5378 inet6_dump_ifaddr, NULL);
5379 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5380 inet6_dump_ifmcaddr, NULL);
5381 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5382 inet6_dump_ifacaddr, NULL);
76f8f6cb 5383 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 5384 inet6_netconf_dump_devconf, NULL);
c127ea2c 5385
2a8cc6c8
YH		 5386 ipv6_addr_label_rtnl_register();
5387
1da177e4 5388 return 0;
c127ea2c 5389errout:
b382b191 5390 rtnl_af_unregister(&inet6_ops);
c127ea2c 5391 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5392errlo:
c15b1cca
HFS		 5393 destroy_workqueue(addrconf_wq);
5394out_nowq:
e0da5a48 5395 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 5396out_addrlabel:
5397 ipv6_addr_label_cleanup();
5398out:
c127ea2c 5399 return err;
1da177e4
LT		 5400}
5401
09f7709f 5402void addrconf_cleanup(void)
1da177e4 5403{
176c39af 5404 struct net_device *dev;
1da177e4
LT		 5405 int i;
5406
5407 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5408 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 5409 ipv6_addr_label_cleanup();
1da177e4
LT		 5410
5411 rtnl_lock();
5412
b382b191
TG		 5413 __rtnl_af_unregister(&inet6_ops);
5414
176c39af
DL		 5415 /* clean dev list */
5416 for_each_netdev(&init_net, dev) {
5417 if (__in6_dev_get(dev) == NULL)
5418 continue;
5419 addrconf_ifdown(dev, 1);
5420 }
5421 addrconf_ifdown(init_net.loopback_dev, 2);
5422
1da177e4
LT		 5423 /*
5424 * Check hash table.
5425 */
5c578aed 5426 spin_lock_bh(&addrconf_hash_lock);
c2e21293 5427 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5428 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 5429 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 5430 cancel_delayed_work(&addr_chk_work);
1da177e4 5431 rtnl_unlock();
c15b1cca
HFS		 5432
5433 destroy_workqueue(addrconf_wq);
1da177e4 5434}
Linux 6.x block layer and io_uring tree(s)