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neigh: wrap proc dointvec functions
[mirror_ubuntu-bionic-kernel.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
1da177e4
LT		 136static void addrconf_verify(unsigned long);
137
8d06afab 138static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 139static DEFINE_SPINLOCK(addrconf_verify_lock);
140
141static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
142static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
143
93d9b7d7
JP		 144static void addrconf_type_change(struct net_device *dev,
145 unsigned long event);
1da177e4
LT		 146static int addrconf_ifdown(struct net_device *dev, int how);
147
21caa662
RK		 148static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
149 int plen,
150 const struct net_device *dev,
151 u32 flags, u32 noflags);
152
cf22f9a2 153static void addrconf_dad_start(struct inet6_ifaddr *ifp);
1da177e4
LT		 154static void addrconf_dad_timer(unsigned long data);
155static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 156static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 157static void addrconf_rs_timer(unsigned long data);
158static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
159static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
160
1ab1457c 161static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 162 struct prefix_info *pinfo);
3e81c6da
DM		 163static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
164 struct net_device *dev);
1da177e4 165
888c848e 166static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 167 .forwarding = 0,
168 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
169 .mtu6 = IPV6_MIN_MTU,
170 .accept_ra = 1,
171 .accept_redirects = 1,
172 .autoconf = 1,
173 .force_mld_version = 0,
fc4eba58
HFS		 174 .mldv1_unsolicited_report_interval = 10 * HZ,
175 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 176 .dad_transmits = 1,
177 .rtr_solicits = MAX_RTR_SOLICITATIONS,
178 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
179 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 180 .use_tempaddr = 0,
181 .temp_valid_lft = TEMP_VALID_LIFETIME,
182 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
183 .regen_max_retry = REGEN_MAX_RETRY,
184 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 185 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 186 .accept_ra_defrtr = 1,
c4fd30eb 187 .accept_ra_pinfo = 1,
930d6ff2
YH		 188#ifdef CONFIG_IPV6_ROUTER_PREF
189 .accept_ra_rtr_pref = 1,
52e16356 190 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 191#ifdef CONFIG_IPV6_ROUTE_INFO
192 .accept_ra_rt_info_max_plen = 0,
193#endif
930d6ff2 194#endif
fbea49e1 195 .proxy_ndp = 0,
0bcbc926 196 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 197 .disable_ipv6 = 0,
1b34be74 198 .accept_dad = 1,
b800c3b9 199 .suppress_frag_ndisc = 1,
1da177e4
LT		 200};
201
ab32ea5d 202static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 203 .forwarding = 0,
204 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
205 .mtu6 = IPV6_MIN_MTU,
206 .accept_ra = 1,
207 .accept_redirects = 1,
208 .autoconf = 1,
fc4eba58
HFS		 209 .force_mld_version = 0,
210 .mldv1_unsolicited_report_interval = 10 * HZ,
211 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 212 .dad_transmits = 1,
213 .rtr_solicits = MAX_RTR_SOLICITATIONS,
214 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
215 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 216 .use_tempaddr = 0,
217 .temp_valid_lft = TEMP_VALID_LIFETIME,
218 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
219 .regen_max_retry = REGEN_MAX_RETRY,
220 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 221 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 222 .accept_ra_defrtr = 1,
c4fd30eb 223 .accept_ra_pinfo = 1,
930d6ff2
YH		 224#ifdef CONFIG_IPV6_ROUTER_PREF
225 .accept_ra_rtr_pref = 1,
52e16356 226 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 227#ifdef CONFIG_IPV6_ROUTE_INFO
228 .accept_ra_rt_info_max_plen = 0,
229#endif
930d6ff2 230#endif
fbea49e1 231 .proxy_ndp = 0,
0bcbc926 232 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 233 .disable_ipv6 = 0,
1b34be74 234 .accept_dad = 1,
b800c3b9 235 .suppress_frag_ndisc = 1,
1da177e4
LT		 236};
237
f24e3d65 238/* Check if a valid qdisc is available */
05297949 239static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 240{
05297949 241 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 242}
243
b7b1bfce 244static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 245{
b7b1bfce
HFS		 246 if (del_timer(&idev->rs_timer))
247 __in6_dev_put(idev);
248}
249
250static void addrconf_del_dad_timer(struct inet6_ifaddr *ifp)
251{
252 if (del_timer(&ifp->dad_timer))
1da177e4
LT		 253 __in6_ifa_put(ifp);
254}
255
b7b1bfce
HFS		 256static void addrconf_mod_rs_timer(struct inet6_dev *idev,
257 unsigned long when)
258{
259 if (!timer_pending(&idev->rs_timer))
260 in6_dev_hold(idev);
261 mod_timer(&idev->rs_timer, jiffies + when);
262}
1da177e4 263
b7b1bfce
HFS		 264static void addrconf_mod_dad_timer(struct inet6_ifaddr *ifp,
265 unsigned long when)
1da177e4 266{
b7b1bfce 267 if (!timer_pending(&ifp->dad_timer))
1da177e4 268 in6_ifa_hold(ifp);
b7b1bfce 269 mod_timer(&ifp->dad_timer, jiffies + when);
1da177e4
LT		 270}
271
7f7d9a6b
HX		 272static int snmp6_alloc_dev(struct inet6_dev *idev)
273{
827da44c
JS		 274 int i;
275
7d720c3e 276 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
1823e4c8
ED		 277 sizeof(struct ipstats_mib),
278 __alignof__(struct ipstats_mib)) < 0)
7f7d9a6b 279 goto err_ip;
827da44c
JS		 280
281 for_each_possible_cpu(i) {
282 struct ipstats_mib *addrconf_stats;
283 addrconf_stats = per_cpu_ptr(idev->stats.ipv6[0], i);
284 u64_stats_init(&addrconf_stats->syncp);
285#if SNMP_ARRAY_SZ == 2
286 addrconf_stats = per_cpu_ptr(idev->stats.ipv6[1], i);
287 u64_stats_init(&addrconf_stats->syncp);
288#endif
289 }
290
291
be281e55
ED		 292 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
293 GFP_KERNEL);
294 if (!idev->stats.icmpv6dev)
7f7d9a6b 295 goto err_icmp;
be281e55
ED		 296 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
297 GFP_KERNEL);
298 if (!idev->stats.icmpv6msgdev)
14878f75 299 goto err_icmpmsg;
7f7d9a6b
HX		 300
301 return 0;
302
14878f75 303err_icmpmsg:
be281e55 304 kfree(idev->stats.icmpv6dev);
7f7d9a6b 305err_icmp:
7d720c3e 306 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b 307err_ip:
aaf70ec7 308 return -ENOMEM;
7f7d9a6b
HX		 309}
310
8e5e8f30 311static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 312{
313 struct inet6_dev *ndev;
314
315 ASSERT_RTNL();
316
317 if (dev->mtu < IPV6_MIN_MTU)
318 return NULL;
319
1ab1457c 320 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 321
1ab1457c
YH		 322 if (ndev == NULL)
323 return NULL;
322f74a4
IO		 324
325 rwlock_init(&ndev->lock);
326 ndev->dev = dev;
502a2ffd 327 INIT_LIST_HEAD(&ndev->addr_list);
b7b1bfce
HFS		 328 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
329 (unsigned long)ndev);
c346dca1 330 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 331 ndev->cnf.mtu6 = dev->mtu;
332 ndev->cnf.sysctl = NULL;
333 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
334 if (ndev->nd_parms == NULL) {
335 kfree(ndev);
336 return NULL;
337 }
0187bdfb
BH		 338 if (ndev->cnf.forwarding)
339 dev_disable_lro(dev);
322f74a4
IO		 340 /* We refer to the device */
341 dev_hold(dev);
1da177e4 342
322f74a4 343 if (snmp6_alloc_dev(ndev) < 0) {
ba3542e1 344 ADBG(KERN_WARNING
f3213831 345 "%s: cannot allocate memory for statistics; dev=%s.\n",
ba3542e1 346 __func__, dev->name);
322f74a4 347 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 348 dev_put(dev);
349 kfree(ndev);
322f74a4
IO		 350 return NULL;
351 }
1da177e4 352
322f74a4 353 if (snmp6_register_dev(ndev) < 0) {
ba3542e1 354 ADBG(KERN_WARNING
f3213831 355 "%s: cannot create /proc/net/dev_snmp6/%s\n",
ba3542e1 356 __func__, dev->name);
322f74a4
IO		 357 neigh_parms_release(&nd_tbl, ndev->nd_parms);
358 ndev->dead = 1;
359 in6_dev_finish_destroy(ndev);
360 return NULL;
361 }
362
363 /* One reference from device. We must do this before
364 * we invoke __ipv6_regen_rndid().
365 */
366 in6_dev_hold(ndev);
1da177e4 367
1b34be74
YH		 368 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
369 ndev->cnf.accept_dad = -1;
370
07a93626 371#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 372 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 373 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 374 ndev->cnf.rtr_solicits = 0;
375 }
376#endif
377
372e6c8f 378 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 379 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 380 if ((dev->flags&IFF_LOOPBACK) ||
381 dev->type == ARPHRD_TUNNEL ||
9625ed72 382 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 383 dev->type == ARPHRD_SIT ||
0be669bb 384 dev->type == ARPHRD_NONE) {
322f74a4
IO		 385 ndev->cnf.use_tempaddr = -1;
386 } else {
387 in6_dev_hold(ndev);
388 ipv6_regen_rndid((unsigned long) ndev);
389 }
5d9efa7e 390
914faa14 391 ndev->token = in6addr_any;
1da177e4 392
f24e3d65 393 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 394 ndev->if_flags |= IF_READY;
395
322f74a4
IO		 396 ipv6_mc_init_dev(ndev);
397 ndev->tstamp = jiffies;
f52295a9 398 addrconf_sysctl_register(ndev);
30c4cf57 399 /* protected by rtnl_lock */
cf778b00 400 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 401
2c5e8933
HFS		 402 /* Join interface-local all-node multicast group */
403 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
404
d88ae4cc 405 /* Join all-node multicast group */
f3ee4010 406 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 407
d6ddef9e 408 /* Join all-router multicast group if forwarding is set */
8b2aaede 409 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 410 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
411
1da177e4
LT		 412 return ndev;
413}
414
8e5e8f30 415static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 416{
417 struct inet6_dev *idev;
418
419 ASSERT_RTNL();
420
e21e8467
SH		 421 idev = __in6_dev_get(dev);
422 if (!idev) {
423 idev = ipv6_add_dev(dev);
424 if (!idev)
1da177e4
LT		 425 return NULL;
426 }
c5e33bdd 427
1da177e4
LT		 428 if (dev->flags&IFF_UP)
429 ipv6_mc_up(idev);
430 return idev;
431}
432
f3a1bfb1
ND		 433static int inet6_netconf_msgsize_devconf(int type)
434{
435 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
436 + nla_total_size(4); /* NETCONFA_IFINDEX */
437
76f8f6cb
ND		 438 /* type -1 is used for ALL */
439 if (type == -1 || type == NETCONFA_FORWARDING)
f3a1bfb1 440 size += nla_total_size(4);
b1afce95 441#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 442 if (type == -1 || type == NETCONFA_MC_FORWARDING)
443 size += nla_total_size(4);
b1afce95 444#endif
f3a1bfb1
ND		 445
446 return size;
447}
448
449static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
450 struct ipv6_devconf *devconf, u32 portid,
451 u32 seq, int event, unsigned int flags,
452 int type)
453{
454 struct nlmsghdr *nlh;
455 struct netconfmsg *ncm;
456
457 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
458 flags);
459 if (nlh == NULL)
460 return -EMSGSIZE;
461
462 ncm = nlmsg_data(nlh);
463 ncm->ncm_family = AF_INET6;
464
465 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
466 goto nla_put_failure;
467
76f8f6cb
ND		 468 /* type -1 is used for ALL */
469 if ((type == -1 || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 470 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
471 goto nla_put_failure;
b1afce95 472#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 473 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
474 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
475 devconf->mc_forwarding) < 0)
476 goto nla_put_failure;
b1afce95 477#endif
f3a1bfb1
ND		 478 return nlmsg_end(skb, nlh);
479
480nla_put_failure:
481 nlmsg_cancel(skb, nlh);
482 return -EMSGSIZE;
483}
484
d67b8c61
ND		 485void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
486 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 487{
488 struct sk_buff *skb;
489 int err = -ENOBUFS;
490
491 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
492 if (skb == NULL)
493 goto errout;
494
495 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
496 RTM_NEWNETCONF, 0, type);
497 if (err < 0) {
498 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
499 WARN_ON(err == -EMSGSIZE);
500 kfree_skb(skb);
501 goto errout;
502 }
503 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
504 return;
505errout:
bd779028 506 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 507}
508
76f8f6cb
ND		 509static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
510 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
511 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
512};
513
514static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 515 struct nlmsghdr *nlh)
76f8f6cb
ND		 516{
517 struct net *net = sock_net(in_skb->sk);
518 struct nlattr *tb[NETCONFA_MAX+1];
519 struct netconfmsg *ncm;
520 struct sk_buff *skb;
521 struct ipv6_devconf *devconf;
522 struct inet6_dev *in6_dev;
523 struct net_device *dev;
524 int ifindex;
525 int err;
526
527 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
528 devconf_ipv6_policy);
529 if (err < 0)
530 goto errout;
531
532 err = EINVAL;
533 if (!tb[NETCONFA_IFINDEX])
534 goto errout;
535
536 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
537 switch (ifindex) {
538 case NETCONFA_IFINDEX_ALL:
539 devconf = net->ipv6.devconf_all;
540 break;
541 case NETCONFA_IFINDEX_DEFAULT:
542 devconf = net->ipv6.devconf_dflt;
543 break;
544 default:
545 dev = __dev_get_by_index(net, ifindex);
546 if (dev == NULL)
547 goto errout;
548 in6_dev = __in6_dev_get(dev);
549 if (in6_dev == NULL)
550 goto errout;
551 devconf = &in6_dev->cnf;
552 break;
553 }
554
555 err = -ENOBUFS;
556 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
557 if (skb == NULL)
558 goto errout;
559
560 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
561 NETLINK_CB(in_skb).portid,
562 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
563 -1);
564 if (err < 0) {
565 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
566 WARN_ON(err == -EMSGSIZE);
567 kfree_skb(skb);
568 goto errout;
569 }
570 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
571errout:
572 return err;
573}
574
7a674200
ND		 575static int inet6_netconf_dump_devconf(struct sk_buff *skb,
576 struct netlink_callback *cb)
577{
578 struct net *net = sock_net(skb->sk);
579 int h, s_h;
580 int idx, s_idx;
581 struct net_device *dev;
582 struct inet6_dev *idev;
583 struct hlist_head *head;
584
585 s_h = cb->args[0];
586 s_idx = idx = cb->args[1];
587
588 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
589 idx = 0;
590 head = &net->dev_index_head[h];
591 rcu_read_lock();
63998ac2
ND		 592 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
593 net->dev_base_seq;
7a674200
ND		 594 hlist_for_each_entry_rcu(dev, head, index_hlist) {
595 if (idx < s_idx)
596 goto cont;
597 idev = __in6_dev_get(dev);
598 if (!idev)
599 goto cont;
600
601 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
602 &idev->cnf,
603 NETLINK_CB(cb->skb).portid,
604 cb->nlh->nlmsg_seq,
605 RTM_NEWNETCONF,
606 NLM_F_MULTI,
607 -1) <= 0) {
608 rcu_read_unlock();
609 goto done;
610 }
63998ac2 611 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 612cont:
613 idx++;
614 }
615 rcu_read_unlock();
616 }
617 if (h == NETDEV_HASHENTRIES) {
618 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
619 net->ipv6.devconf_all,
620 NETLINK_CB(cb->skb).portid,
621 cb->nlh->nlmsg_seq,
622 RTM_NEWNETCONF, NLM_F_MULTI,
623 -1) <= 0)
624 goto done;
625 else
626 h++;
627 }
628 if (h == NETDEV_HASHENTRIES + 1) {
629 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
630 net->ipv6.devconf_dflt,
631 NETLINK_CB(cb->skb).portid,
632 cb->nlh->nlmsg_seq,
633 RTM_NEWNETCONF, NLM_F_MULTI,
634 -1) <= 0)
635 goto done;
636 else
637 h++;
638 }
639done:
640 cb->args[0] = h;
641 cb->args[1] = idx;
642
643 return skb->len;
644}
645
1da177e4
LT		 646#ifdef CONFIG_SYSCTL
647static void dev_forward_change(struct inet6_dev *idev)
648{
649 struct net_device *dev;
650 struct inet6_ifaddr *ifa;
1da177e4
LT		 651
652 if (!idev)
653 return;
654 dev = idev->dev;
0187bdfb
BH		 655 if (idev->cnf.forwarding)
656 dev_disable_lro(dev);
1a940835 657 if (dev->flags & IFF_MULTICAST) {
2c5e8933 658 if (idev->cnf.forwarding) {
f3ee4010 659 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 660 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
661 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
662 } else {
f3ee4010 663 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 664 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
665 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
666 }
1da177e4 667 }
502a2ffd 668
669 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 670 if (ifa->flags&IFA_F_TENTATIVE)
671 continue;
1da177e4
LT		 672 if (idev->cnf.forwarding)
673 addrconf_join_anycast(ifa);
674 else
675 addrconf_leave_anycast(ifa);
676 }
f3a1bfb1
ND		 677 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
678 dev->ifindex, &idev->cnf);
1da177e4
LT		 679}
680
681
e186932b 682static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 683{
684 struct net_device *dev;
685 struct inet6_dev *idev;
686
4acd4945 687 for_each_netdev(net, dev) {
1da177e4
LT		 688 idev = __in6_dev_get(dev);
689 if (idev) {
e186932b
PE		 690 int changed = (!idev->cnf.forwarding) ^ (!newf);
691 idev->cnf.forwarding = newf;
1da177e4
LT		 692 if (changed)
693 dev_forward_change(idev);
694 }
1da177e4 695 }
1da177e4 696}
c8fecf22 697
013d97e9 698static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 699{
bff16c2f 700 struct net *net;
013d97e9
FR		 701 int old;
702
703 if (!rtnl_trylock())
704 return restart_syscall();
bff16c2f
PE		 705
706 net = (struct net *)table->extra2;
013d97e9
FR		 707 old = *p;
708 *p = newf;
b325fddb 709
013d97e9 710 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 711 if ((!newf) ^ (!old))
712 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
713 NETCONFA_IFINDEX_DEFAULT,
714 net->ipv6.devconf_dflt);
013d97e9
FR		 715 rtnl_unlock();
716 return 0;
88af182e 717 }
c8fecf22 718
e186932b 719 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 720 net->ipv6.devconf_dflt->forwarding = newf;
721 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 722 if ((!newf) ^ (!old))
723 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
724 NETCONFA_IFINDEX_ALL,
725 net->ipv6.devconf_all);
013d97e9 726 } else if ((!newf) ^ (!old))
c8fecf22 727 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 728 rtnl_unlock();
c8fecf22 729
013d97e9 730 if (newf)
7b4da532 731 rt6_purge_dflt_routers(net);
b325fddb 732 return 1;
c8fecf22 733}
1da177e4
LT		 734#endif
735
5c578aed 736/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 737void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
738{
c2e21293 739 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 740
1da177e4 741#ifdef NET_REFCNT_DEBUG
91df42be 742 pr_debug("%s\n", __func__);
1da177e4
LT		 743#endif
744
745 in6_dev_put(ifp->idev);
746
b7b1bfce 747 if (del_timer(&ifp->dad_timer))
e21e8467 748 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
1da177e4 749
e9d3e084 750 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 751 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 752 return;
753 }
94e187c0 754 ip6_rt_put(ifp->rt);
1da177e4 755
e5785985 756 kfree_rcu(ifp, rcu);
1da177e4
LT		 757}
758
e55ffac6
BH		 759static void
760ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
761{
502a2ffd 762 struct list_head *p;
8a6ce0c0 763 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 764
765 /*
766 * Each device address list is sorted in order of scope -
767 * global before linklocal.
768 */
502a2ffd 769 list_for_each(p, &idev->addr_list) {
770 struct inet6_ifaddr *ifa
771 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 772 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 773 break;
774 }
775
b54c9b98 776 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 777}
778
ddbe5032 779static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 780{
ddbe5032 781 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 782}
783
1da177e4
LT		 784/* On success it returns ifp with increased reference count */
785
786static struct inet6_ifaddr *
3f8f5298
JP		 787ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
788 const struct in6_addr *peer_addr, int pfxlen,
8a226b2c 789 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
1da177e4
LT		 790{
791 struct inet6_ifaddr *ifa = NULL;
792 struct rt6_info *rt;
3a88a81d 793 unsigned int hash;
1da177e4 794 int err = 0;
d68b8270
YH		 795 int addr_type = ipv6_addr_type(addr);
796
797 if (addr_type == IPV6_ADDR_ANY ||
798 addr_type & IPV6_ADDR_MULTICAST ||
799 (!(idev->dev->flags & IFF_LOOPBACK) &&
800 addr_type & IPV6_ADDR_LOOPBACK))
801 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 802
8814c4b5 803 rcu_read_lock_bh();
1da177e4
LT		 804 if (idev->dead) {
805 err = -ENODEV; /*XXX*/
806 goto out2;
807 }
808
56d417b1 809 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 810 err = -EACCES;
811 goto out2;
812 }
813
5c578aed 814 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 815
816 /* Ignore adding duplicate addresses on an interface */
c346dca1 817 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ba3542e1 818 ADBG("ipv6_add_addr: already assigned\n");
1da177e4
LT		 819 err = -EEXIST;
820 goto out;
821 }
822
322f74a4 823 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 824
825 if (ifa == NULL) {
ba3542e1 826 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 827 err = -ENOBUFS;
828 goto out;
829 }
830
8f031519 831 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 832 if (IS_ERR(rt)) {
833 err = PTR_ERR(rt);
834 goto out;
835 }
836
4e3fd7a0 837 ifa->addr = *addr;
3f8f5298
JP		 838 if (peer_addr)
839 ifa->peer_addr = *peer_addr;
1da177e4
LT		 840
841 spin_lock_init(&ifa->lock);
e9d3e084 842 spin_lock_init(&ifa->state_lock);
b7b1bfce
HFS		 843 setup_timer(&ifa->dad_timer, addrconf_dad_timer,
844 (unsigned long)ifa);
c2e21293 845 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 846 ifa->scope = scope;
847 ifa->prefix_len = pfxlen;
848 ifa->flags = flags | IFA_F_TENTATIVE;
8a226b2c
JB		 849 ifa->valid_lft = valid_lft;
850 ifa->prefered_lft = prefered_lft;
1da177e4 851 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 852 ifa->tokenized = false;
1da177e4 853
57f5f544
KF		 854 ifa->rt = rt;
855
1da177e4
LT		 856 ifa->idev = idev;
857 in6_dev_hold(idev);
858 /* For caller */
859 in6_ifa_hold(ifa);
860
861 /* Add to big hash table */
ddbe5032 862 hash = inet6_addr_hash(addr);
1da177e4 863
5c578aed 864 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 865 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 866
867 write_lock(&idev->lock);
868 /* Add to inet6_dev unicast addr list. */
e55ffac6 869 ipv6_link_dev_addr(idev, ifa);
1da177e4 870
1da177e4 871 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 872 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 873 in6_ifa_hold(ifa);
874 }
1da177e4 875
1da177e4
LT		 876 in6_ifa_hold(ifa);
877 write_unlock(&idev->lock);
878out2:
8814c4b5 879 rcu_read_unlock_bh();
1da177e4 880
fd92833a 881 if (likely(err == 0))
f88c91dd 882 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 883 else {
884 kfree(ifa);
885 ifa = ERR_PTR(err);
886 }
887
888 return ifa;
889out:
5c578aed 890 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 891 goto out2;
892}
893
894/* This function wants to get referenced ifp and releases it before return */
895
896static void ipv6_del_addr(struct inet6_ifaddr *ifp)
897{
502a2ffd 898 struct inet6_ifaddr *ifa, *ifn;
1da177e4 899 struct inet6_dev *idev = ifp->idev;
4c5ff6a6 900 int state;
1da177e4
LT		 901 int deleted = 0, onlink = 0;
902 unsigned long expires = jiffies;
903
4c5ff6a6
HX		 904 spin_lock_bh(&ifp->state_lock);
905 state = ifp->state;
e9d3e084 906 ifp->state = INET6_IFADDR_STATE_DEAD;
4c5ff6a6
HX		 907 spin_unlock_bh(&ifp->state_lock);
908
909 if (state == INET6_IFADDR_STATE_DEAD)
910 goto out;
1da177e4 911
5c578aed 912 spin_lock_bh(&addrconf_hash_lock);
913 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 914 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 915
916 write_lock_bh(&idev->lock);
5d9efa7e 917
1da177e4 918 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 919 list_del(&ifp->tmp_list);
920 if (ifp->ifpub) {
921 in6_ifa_put(ifp->ifpub);
922 ifp->ifpub = NULL;
1da177e4 923 }
372e6c8f 924 __in6_ifa_put(ifp);
1da177e4 925 }
1da177e4 926
502a2ffd 927 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
1da177e4 928 if (ifa == ifp) {
502a2ffd 929 list_del_init(&ifp->if_list);
1da177e4 930 __in6_ifa_put(ifp);
502a2ffd 931
1da177e4
LT		 932 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
933 break;
934 deleted = 1;
1d142804 935 continue;
1da177e4
LT		 936 } else if (ifp->flags & IFA_F_PERMANENT) {
937 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
938 ifp->prefix_len)) {
939 if (ifa->flags & IFA_F_PERMANENT) {
940 onlink = 1;
941 if (deleted)
942 break;
943 } else {
944 unsigned long lifetime;
945
946 if (!onlink)
947 onlink = -1;
948
949 spin_lock(&ifa->lock);
4bed72e4
YH		 950
951 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
952 /*
953 * Note: Because this address is
954 * not permanent, lifetime <
955 * LONG_MAX / HZ here.
956 */
1da177e4
LT		 957 if (time_before(expires,
958 ifa->tstamp + lifetime * HZ))
959 expires = ifa->tstamp + lifetime * HZ;
960 spin_unlock(&ifa->lock);
961 }
962 }
963 }
964 }
965 write_unlock_bh(&idev->lock);
966
b7b1bfce 967 addrconf_del_dad_timer(ifp);
b2238566 968
1da177e4
LT		 969 ipv6_ifa_notify(RTM_DELADDR, ifp);
970
f88c91dd 971 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 972
1da177e4
LT		 973 /*
974 * Purge or update corresponding prefix
975 *
976 * 1) we don't purge prefix here if address was not permanent.
977 * prefix is managed by its own lifetime.
978 * 2) if there're no addresses, delete prefix.
979 * 3) if there're still other permanent address(es),
980 * corresponding prefix is still permanent.
981 * 4) otherwise, update prefix lifetime to the
982 * longest valid lifetime among the corresponding
983 * addresses on the device.
984 * Note: subsequent RA will update lifetime.
985 *
986 * --yoshfuji
987 */
988 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
989 struct in6_addr prefix;
990 struct rt6_info *rt;
64c6d08e 991
1da177e4 992 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
1da177e4 993
21caa662
RK		 994 rt = addrconf_get_prefix_route(&prefix,
995 ifp->prefix_len,
996 ifp->idev->dev,
997 0, RTF_GATEWAY | RTF_DEFAULT);
998
999 if (rt) {
1da177e4 1000 if (onlink == 0) {
e0a1ad73 1001 ip6_del_rt(rt);
1da177e4
LT		 1002 rt = NULL;
1003 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1716a961 1004 rt6_set_expires(rt, expires);
1da177e4
LT		 1005 }
1006 }
94e187c0 1007 ip6_rt_put(rt);
1da177e4
LT		 1008 }
1009
c3968a85
DW		 1010 /* clean up prefsrc entries */
1011 rt6_remove_prefsrc(ifp);
4c5ff6a6 1012out:
1da177e4
LT		 1013 in6_ifa_put(ifp);
1014}
1015
1da177e4
LT		 1016static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1017{
1018 struct inet6_dev *idev = ifp->idev;
1019 struct in6_addr addr, *tmpaddr;
76f793e3 1020 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1021 unsigned long regen_advance;
1da177e4
LT		 1022 int tmp_plen;
1023 int ret = 0;
95c385b4 1024 u32 addr_flags;
76f793e3 1025 unsigned long now = jiffies;
1da177e4 1026
53bd6749 1027 write_lock_bh(&idev->lock);
1da177e4
LT		 1028 if (ift) {
1029 spin_lock_bh(&ift->lock);
1030 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1031 spin_unlock_bh(&ift->lock);
1032 tmpaddr = &addr;
1033 } else {
1034 tmpaddr = NULL;
1035 }
1036retry:
1037 in6_dev_hold(idev);
1038 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1039 write_unlock_bh(&idev->lock);
f3213831 1040 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1041 in6_dev_put(idev);
1042 ret = -1;
1043 goto out;
1044 }
1045 spin_lock_bh(&ifp->lock);
1046 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1047 idev->cnf.use_tempaddr = -1; /*XXX*/
1048 spin_unlock_bh(&ifp->lock);
53bd6749 1049 write_unlock_bh(&idev->lock);
f3213831
JP		 1050 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1051 __func__);
1da177e4
LT		 1052 in6_dev_put(idev);
1053 ret = -1;
1054 goto out;
1055 }
1056 in6_ifa_hold(ifp);
1057 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 1058 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1059 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1060 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 1061 tmp_valid_lft = min_t(__u32,
1062 ifp->valid_lft,
7a876b0e 1063 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 1064 tmp_prefered_lft = min_t(__u32,
1065 ifp->prefered_lft,
7a876b0e 1066 idev->cnf.temp_prefered_lft + age -
784e2710 1067 idev->cnf.max_desync_factor);
1da177e4 1068 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1069 tmp_tstamp = ifp->tstamp;
1070 spin_unlock_bh(&ifp->lock);
1071
eac55bf9 1072 regen_advance = idev->cnf.regen_max_retry *
7eaa48a4 1073 idev->cnf.dad_transmits *
1f9248e5 1074 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
53bd6749 1075 write_unlock_bh(&idev->lock);
95c385b4 1076
eac55bf9
BB		 1077 /* A temporary address is created only if this calculated Preferred
1078 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1079 * an implementation must not create a temporary address with a zero
1080 * Preferred Lifetime.
1081 */
1082 if (tmp_prefered_lft <= regen_advance) {
1083 in6_ifa_put(ifp);
1084 in6_dev_put(idev);
1085 ret = -1;
1086 goto out;
1087 }
1088
95c385b4
NH		 1089 addr_flags = IFA_F_TEMPORARY;
1090 /* set in addrconf_prefix_rcv() */
1091 if (ifp->flags & IFA_F_OPTIMISTIC)
1092 addr_flags |= IFA_F_OPTIMISTIC;
1093
4b08a8f1
HFS		 1094 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1095 ipv6_addr_scope(&addr), addr_flags,
1096 tmp_valid_lft, tmp_prefered_lft);
1097 if (IS_ERR(ift)) {
1da177e4
LT		 1098 in6_ifa_put(ifp);
1099 in6_dev_put(idev);
f3213831 1100 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1101 tmpaddr = &addr;
53bd6749 1102 write_lock_bh(&idev->lock);
1da177e4
LT		 1103 goto retry;
1104 }
1105
1106 spin_lock_bh(&ift->lock);
1107 ift->ifpub = ifp;
76f793e3 1108 ift->cstamp = now;
1da177e4
LT		 1109 ift->tstamp = tmp_tstamp;
1110 spin_unlock_bh(&ift->lock);
1111
cf22f9a2 1112 addrconf_dad_start(ift);
1da177e4
LT		 1113 in6_ifa_put(ift);
1114 in6_dev_put(idev);
1115out:
1116 return ret;
1117}
1da177e4
LT		 1118
1119/*
072047e4 1120 * Choose an appropriate source address (RFC3484)
1da177e4 1121 */
a9b05723
YH		 1122enum {
1123 IPV6_SADDR_RULE_INIT = 0,
1124 IPV6_SADDR_RULE_LOCAL,
1125 IPV6_SADDR_RULE_SCOPE,
1126 IPV6_SADDR_RULE_PREFERRED,
1127#ifdef CONFIG_IPV6_MIP6
1128 IPV6_SADDR_RULE_HOA,
1129#endif
1130 IPV6_SADDR_RULE_OIF,
1131 IPV6_SADDR_RULE_LABEL,
a9b05723 1132 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1133 IPV6_SADDR_RULE_ORCHID,
1134 IPV6_SADDR_RULE_PREFIX,
1135 IPV6_SADDR_RULE_MAX
1136};
1137
072047e4 1138struct ipv6_saddr_score {
a9b05723
YH		 1139 int rule;
1140 int addr_type;
1141 struct inet6_ifaddr *ifa;
1142 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1143 int scopedist;
1144 int matchlen;
072047e4
YH		 1145};
1146
a9b05723 1147struct ipv6_saddr_dst {
9acd9f3a 1148 const struct in6_addr *addr;
a9b05723
YH		 1149 int ifindex;
1150 int scope;
1151 int label;
7cbca67c 1152 unsigned int prefs;
a9b05723 1153};
072047e4 1154
b6f99a21 1155static inline int ipv6_saddr_preferred(int type)
1da177e4 1156{
45bb0060 1157 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1158 return 1;
1159 return 0;
1da177e4
LT		 1160}
1161
3de23255
BT		 1162static int ipv6_get_saddr_eval(struct net *net,
1163 struct ipv6_saddr_score *score,
a9b05723
YH		 1164 struct ipv6_saddr_dst *dst,
1165 int i)
1166{
1167 int ret;
1168
1169 if (i <= score->rule) {
1170 switch (i) {
1171 case IPV6_SADDR_RULE_SCOPE:
1172 ret = score->scopedist;
1173 break;
1174 case IPV6_SADDR_RULE_PREFIX:
1175 ret = score->matchlen;
1176 break;
1177 default:
1178 ret = !!test_bit(i, score->scorebits);
1179 }
1180 goto out;
1181 }
1182
1183 switch (i) {
1184 case IPV6_SADDR_RULE_INIT:
1185 /* Rule 0: remember if hiscore is not ready yet */
1186 ret = !!score->ifa;
1187 break;
1188 case IPV6_SADDR_RULE_LOCAL:
1189 /* Rule 1: Prefer same address */
1190 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1191 break;
1192 case IPV6_SADDR_RULE_SCOPE:
1193 /* Rule 2: Prefer appropriate scope
1194 *
1195 * ret
1196 * ^
1197 * -1 | d 15
1198 * ---+--+-+---> scope
1199 * |
1200 * | d is scope of the destination.
1201 * B-d | \
1202 * | \ <- smaller scope is better if
1203 * B-15 | \ if scope is enough for destinaion.
1204 * | ret = B - scope (-1 <= scope >= d <= 15).
1205 * d-C-1 | /
1206 * |/ <- greater is better
1207 * -C / if scope is not enough for destination.
1208 * /| ret = scope - C (-1 <= d < scope <= 15).
1209 *
1210 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1211 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1212 * Assume B = 0 and we get C > 29.
1213 */
1214 ret = __ipv6_addr_src_scope(score->addr_type);
1215 if (ret >= dst->scope)
1216 ret = -ret;
1217 else
1218 ret -= 128; /* 30 is enough */
1219 score->scopedist = ret;
1220 break;
1221 case IPV6_SADDR_RULE_PREFERRED:
1222 /* Rule 3: Avoid deprecated and optimistic addresses */
1223 ret = ipv6_saddr_preferred(score->addr_type) ||
1224 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1225 break;
1226#ifdef CONFIG_IPV6_MIP6
1227 case IPV6_SADDR_RULE_HOA:
7cbca67c 1228 {
a9b05723 1229 /* Rule 4: Prefer home address */
7cbca67c
YH		 1230 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1231 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1232 break;
7cbca67c 1233 }
a9b05723
YH		 1234#endif
1235 case IPV6_SADDR_RULE_OIF:
1236 /* Rule 5: Prefer outgoing interface */
1237 ret = (!dst->ifindex ||
1238 dst->ifindex == score->ifa->idev->dev->ifindex);
1239 break;
1240 case IPV6_SADDR_RULE_LABEL:
1241 /* Rule 6: Prefer matching label */
3de23255
BT		 1242 ret = ipv6_addr_label(net,
1243 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1244 score->ifa->idev->dev->ifindex) == dst->label;
1245 break;
a9b05723 1246 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1247 {
a9b05723 1248 /* Rule 7: Prefer public address
25985edc 1249 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1250 */
7cbca67c
YH		 1251 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1252 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1253 score->ifa->idev->cnf.use_tempaddr >= 2;
1254 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1255 break;
7cbca67c 1256 }
a9b05723
YH		 1257 case IPV6_SADDR_RULE_ORCHID:
1258 /* Rule 8-: Prefer ORCHID vs ORCHID or
1259 * non-ORCHID vs non-ORCHID
1260 */
1261 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1262 ipv6_addr_orchid(dst->addr));
1263 break;
1264 case IPV6_SADDR_RULE_PREFIX:
1265 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1266 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1267 if (ret > score->ifa->prefix_len)
1268 ret = score->ifa->prefix_len;
1269 score->matchlen = ret;
a9b05723
YH		 1270 break;
1271 default:
1272 ret = 0;
1273 }
1274
1275 if (ret)
1276 __set_bit(i, score->scorebits);
1277 score->rule = i;
1278out:
1279 return ret;
1280}
1281
b3f644fc 1282int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1283 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1284 struct in6_addr *saddr)
1da177e4 1285{
a9b05723
YH		 1286 struct ipv6_saddr_score scores[2],
1287 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1288 struct ipv6_saddr_dst dst;
072047e4 1289 struct net_device *dev;
a9b05723 1290 int dst_type;
1da177e4 1291
a9b05723
YH		 1292 dst_type = __ipv6_addr_type(daddr);
1293 dst.addr = daddr;
1294 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1295 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1296 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1297 dst.prefs = prefs;
a9b05723
YH		 1298
1299 hiscore->rule = -1;
1300 hiscore->ifa = NULL;
1da177e4 1301
8814c4b5 1302 rcu_read_lock();
1da177e4 1303
c6d14c84 1304 for_each_netdev_rcu(net, dev) {
072047e4 1305 struct inet6_dev *idev;
072047e4 1306
a9b05723 1307 /* Candidate Source Address (section 4)
072047e4
YH		 1308 * - multicast and link-local destination address,
1309 * the set of candidate source address MUST only
1310 * include addresses assigned to interfaces
1311 * belonging to the same link as the outgoing
1312 * interface.
1313 * (- For site-local destination addresses, the
1314 * set of candidate source addresses MUST only
1315 * include addresses assigned to interfaces
1316 * belonging to the same site as the outgoing
1317 * interface.)
1318 */
a9b05723
YH		 1319 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1320 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1321 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1322 continue;
1da177e4 1323
1da177e4 1324 idev = __in6_dev_get(dev);
072047e4
YH		 1325 if (!idev)
1326 continue;
1327
1328 read_lock_bh(&idev->lock);
502a2ffd 1329 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1330 int i;
072047e4 1331
a9b05723 1332 /*
6b3ae80a
YH		 1333 * - Tentative Address (RFC2462 section 5.4)
1334 * - A tentative address is not considered
1335 * "assigned to an interface" in the traditional
95c385b4 1336 * sense, unless it is also flagged as optimistic.
6b3ae80a 1337 * - Candidate Source Address (section 4)
072047e4
YH		 1338 * - In any case, anycast addresses, multicast
1339 * addresses, and the unspecified address MUST
1340 * NOT be included in a candidate set.
1341 */
a9b05723
YH		 1342 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1343 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1344 continue;
a9b05723
YH		 1345
1346 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1347
1348 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1349 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1350 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1351 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1352 "assigned as unicast address on %s",
1353 dev->name);
1354 continue;
1355 }
1356
a9b05723
YH		 1357 score->rule = -1;
1358 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1359
1360 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1361 int minihiscore, miniscore;
1362
3de23255
BT		 1363 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1364 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1365
1366 if (minihiscore > miniscore) {
1367 if (i == IPV6_SADDR_RULE_SCOPE &&
1368 score->scopedist > 0) {
1369 /*
1370 * special case:
1371 * each remaining entry
1372 * has too small (not enough)
1373 * scope, because ifa entries
1374 * are sorted by their scope
1375 * values.
1376 */
1377 goto try_nextdev;
1378 }
1379 break;
1380 } else if (minihiscore < miniscore) {
a9b05723
YH		 1381 if (hiscore->ifa)
1382 in6_ifa_put(hiscore->ifa);
1383
1384 in6_ifa_hold(score->ifa);
1385
a0bffffc 1386 swap(hiscore, score);
a9b05723
YH		 1387
1388 /* restore our iterator */
1389 score->ifa = hiscore->ifa;
1390
1391 break;
1da177e4 1392 }
072047e4 1393 }
1da177e4 1394 }
a9b05723 1395try_nextdev:
072047e4 1396 read_unlock_bh(&idev->lock);
1da177e4 1397 }
8814c4b5 1398 rcu_read_unlock();
1da177e4 1399
a9b05723 1400 if (!hiscore->ifa)
072047e4 1401 return -EADDRNOTAVAIL;
1ab1457c 1402
4e3fd7a0 1403 *saddr = hiscore->ifa->addr;
a9b05723 1404 in6_ifa_put(hiscore->ifa);
072047e4 1405 return 0;
1da177e4 1406}
5e5f3f0f 1407EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1408
8965779d 1409int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1410 u32 banned_flags)
b7b1bfce
HFS		 1411{
1412 struct inet6_ifaddr *ifp;
1413 int err = -EADDRNOTAVAIL;
1414
1415 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1416 if (ifp->scope == IFA_LINK &&
1417 !(ifp->flags & banned_flags)) {
1418 *addr = ifp->addr;
1419 err = 0;
1420 break;
1421 }
1422 }
1423 return err;
1424}
1425
95c385b4 1426int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1427 u32 banned_flags)
1da177e4
LT		 1428{
1429 struct inet6_dev *idev;
1430 int err = -EADDRNOTAVAIL;
1431
8814c4b5 1432 rcu_read_lock();
e21e8467
SH		 1433 idev = __in6_dev_get(dev);
1434 if (idev) {
1da177e4 1435 read_lock_bh(&idev->lock);
b7b1bfce 1436 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1437 read_unlock_bh(&idev->lock);
1438 }
8814c4b5 1439 rcu_read_unlock();
1da177e4
LT		 1440 return err;
1441}
1442
1443static int ipv6_count_addresses(struct inet6_dev *idev)
1444{
1445 int cnt = 0;
1446 struct inet6_ifaddr *ifp;
1447
1448 read_lock_bh(&idev->lock);
502a2ffd 1449 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1450 cnt++;
1451 read_unlock_bh(&idev->lock);
1452 return cnt;
1453}
1454
b71d1d42 1455int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1456 const struct net_device *dev, int strict)
1da177e4 1457{
eedf042a 1458 struct inet6_ifaddr *ifp;
ddbe5032 1459 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1460
5c578aed 1461 rcu_read_lock_bh();
b67bfe0d 1462 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1463 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1464 continue;
1da177e4 1465 if (ipv6_addr_equal(&ifp->addr, addr) &&
eedf042a
SH		 1466 !(ifp->flags&IFA_F_TENTATIVE) &&
1467 (dev == NULL || ifp->idev->dev == dev ||
1468 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1469 rcu_read_unlock_bh();
1470 return 1;
1da177e4
LT		 1471 }
1472 }
5c578aed 1473
eedf042a
SH		 1474 rcu_read_unlock_bh();
1475 return 0;
1da177e4 1476}
7159039a
YH		 1477EXPORT_SYMBOL(ipv6_chk_addr);
1478
3e81c6da
DM		 1479static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1480 struct net_device *dev)
1da177e4 1481{
ddbe5032 1482 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1483 struct inet6_ifaddr *ifp;
1da177e4 1484
b67bfe0d 1485 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1486 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1487 continue;
1da177e4
LT		 1488 if (ipv6_addr_equal(&ifp->addr, addr)) {
1489 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1490 return true;
1da177e4
LT		 1491 }
1492 }
3e81c6da 1493 return false;
1da177e4
LT		 1494}
1495
7df37ff3
CB		 1496/* Compares an address/prefix_len with addresses on device @dev.
1497 * If one is found it returns true.
1498 */
1499bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1500 const unsigned int prefix_len, struct net_device *dev)
1501{
1502 struct inet6_dev *idev;
1503 struct inet6_ifaddr *ifa;
1504 bool ret = false;
1505
1506 rcu_read_lock();
1507 idev = __in6_dev_get(dev);
1508 if (idev) {
1509 read_lock_bh(&idev->lock);
1510 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1511 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1512 if (ret)
1513 break;
1514 }
1515 read_unlock_bh(&idev->lock);
1516 }
1517 rcu_read_unlock();
1518
1519 return ret;
1520}
1521EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1522
b71d1d42 1523int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1524{
1525 struct inet6_dev *idev;
1526 struct inet6_ifaddr *ifa;
1527 int onlink;
1528
1529 onlink = 0;
1530 rcu_read_lock();
1531 idev = __in6_dev_get(dev);
1532 if (idev) {
1533 read_lock_bh(&idev->lock);
502a2ffd 1534 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1535 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1536 ifa->prefix_len);
1537 if (onlink)
1538 break;
1539 }
1540 read_unlock_bh(&idev->lock);
1541 }
1542 rcu_read_unlock();
1543 return onlink;
1544}
52eeeb84
YH		 1545EXPORT_SYMBOL(ipv6_chk_prefix);
1546
9acd9f3a 1547struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1548 struct net_device *dev, int strict)
1da177e4 1549{
b79d1d54 1550 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1551 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1552
5c578aed 1553 rcu_read_lock_bh();
b67bfe0d 1554 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1555 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1556 continue;
1da177e4
LT		 1557 if (ipv6_addr_equal(&ifp->addr, addr)) {
1558 if (dev == NULL || ifp->idev->dev == dev ||
1559 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1560 result = ifp;
1da177e4
LT		 1561 in6_ifa_hold(ifp);
1562 break;
1563 }
1564 }
1565 }
5c578aed 1566 rcu_read_unlock_bh();
1da177e4 1567
b79d1d54 1568 return result;
1da177e4
LT		 1569}
1570
1da177e4
LT		 1571/* Gets referenced address, destroys ifaddr */
1572
cc411d0b 1573static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1574{
1da177e4
LT		 1575 if (ifp->flags&IFA_F_PERMANENT) {
1576 spin_lock_bh(&ifp->lock);
b7b1bfce 1577 addrconf_del_dad_timer(ifp);
1da177e4 1578 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1579 if (dad_failed)
1580 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1581 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1582 if (dad_failed)
1583 ipv6_ifa_notify(0, ifp);
1da177e4 1584 in6_ifa_put(ifp);
1da177e4
LT		 1585 } else if (ifp->flags&IFA_F_TEMPORARY) {
1586 struct inet6_ifaddr *ifpub;
1587 spin_lock_bh(&ifp->lock);
1588 ifpub = ifp->ifpub;
1589 if (ifpub) {
1590 in6_ifa_hold(ifpub);
1591 spin_unlock_bh(&ifp->lock);
1592 ipv6_create_tempaddr(ifpub, ifp);
1593 in6_ifa_put(ifpub);
1594 } else {
1595 spin_unlock_bh(&ifp->lock);
1596 }
1597 ipv6_del_addr(ifp);
1da177e4
LT		 1598 } else
1599 ipv6_del_addr(ifp);
1600}
1601
f2344a13
HX		 1602static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1603{
1604 int err = -ENOENT;
1605
1606 spin_lock(&ifp->state_lock);
1607 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1608 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1609 err = 0;
1610 }
1611 spin_unlock(&ifp->state_lock);
1612
1613 return err;
1614}
1615
3c21edbd
YH		 1616void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1617{
1b34be74 1618 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1619
853dc2e0
UB		 1620 if (addrconf_dad_end(ifp)) {
1621 in6_ifa_put(ifp);
f2344a13 1622 return;
853dc2e0 1623 }
f2344a13 1624
e87cc472
JP		 1625 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1626 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1627
1b34be74
YH		 1628 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1629 struct in6_addr addr;
1630
1631 addr.s6_addr32[0] = htonl(0xfe800000);
1632 addr.s6_addr32[1] = 0;
1633
1634 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1635 ipv6_addr_equal(&ifp->addr, &addr)) {
1636 /* DAD failed for link-local based on MAC address */
1637 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1638
f3213831 1639 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1640 ifp->idev->dev->name);
1b34be74
YH		 1641 }
1642 }
1643
cc411d0b 1644 addrconf_dad_stop(ifp, 1);
3c21edbd 1645}
1da177e4
LT		 1646
1647/* Join to solicited addr multicast group. */
1648
b71d1d42 1649void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1650{
1651 struct in6_addr maddr;
1652
1653 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1654 return;
1655
1656 addrconf_addr_solict_mult(addr, &maddr);
1657 ipv6_dev_mc_inc(dev, &maddr);
1658}
1659
b71d1d42 1660void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1661{
1662 struct in6_addr maddr;
1663
1664 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1665 return;
1666
1667 addrconf_addr_solict_mult(addr, &maddr);
1668 __ipv6_dev_mc_dec(idev, &maddr);
1669}
1670
20380731 1671static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1672{
1673 struct in6_addr addr;
2bda8a0c
BM		 1674 if (ifp->prefix_len == 127) /* RFC 6164 */
1675 return;
1da177e4
LT		 1676 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1677 if (ipv6_addr_any(&addr))
1678 return;
1679 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1680}
1681
20380731 1682static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1683{
1684 struct in6_addr addr;
32019e65
YH		 1685 if (ifp->prefix_len == 127) /* RFC 6164 */
1686 return;
1da177e4
LT		 1687 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1688 if (ipv6_addr_any(&addr))
1689 return;
1690 __ipv6_dev_ac_dec(ifp->idev, &addr);
1691}
1692
073a8e0e
YH		 1693static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1694{
1695 if (dev->addr_len != ETH_ALEN)
1696 return -1;
1697 memcpy(eui, dev->dev_addr, 3);
1698 memcpy(eui + 5, dev->dev_addr + 3, 3);
1699
1700 /*
1701 * The zSeries OSA network cards can be shared among various
1702 * OS instances, but the OSA cards have only one MAC address.
1703 * This leads to duplicate address conflicts in conjunction
1704 * with IPv6 if more than one instance uses the same card.
1705 *
1706 * The driver for these cards can deliver a unique 16-bit
1707 * identifier for each instance sharing the same card. It is
1708 * placed instead of 0xFFFE in the interface identifier. The
1709 * "u" bit of the interface identifier is not inverted in this
1710 * case. Hence the resulting interface identifier has local
1711 * scope according to RFC2373.
1712 */
1713 if (dev->dev_id) {
1714 eui[3] = (dev->dev_id >> 8) & 0xFF;
1715 eui[4] = dev->dev_id & 0xFF;
1716 } else {
1717 eui[3] = 0xFF;
1718 eui[4] = 0xFE;
1719 eui[0] ^= 2;
1720 }
1721 return 0;
1722}
1723
06a4c1c5 1724static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1725{
1726 if (dev->addr_len != IEEE802154_ADDR_LEN)
1727 return -1;
1728 memcpy(eui, dev->dev_addr, 8);
5e98a36e 1729 eui[0] ^= 2;
06a4c1c5 1730 return 0;
1731}
1732
cb6bf355
YH		 1733static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1734{
1735 union fwnet_hwaddr *ha;
1736
1737 if (dev->addr_len != FWNET_ALEN)
1738 return -1;
1739
1740 ha = (union fwnet_hwaddr *)dev->dev_addr;
1741
1742 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1743 eui[0] ^= 2;
1744 return 0;
1745}
1746
073a8e0e
YH		 1747static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1748{
1749 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1750 if (dev->addr_len != ARCNET_ALEN)
1751 return -1;
1752 memset(eui, 0, 7);
8e5e8f30 1753 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1754 return 0;
1755}
1756
1757static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1758{
1759 if (dev->addr_len != INFINIBAND_ALEN)
1760 return -1;
1761 memcpy(eui, dev->dev_addr + 12, 8);
1762 eui[0] |= 2;
1763 return 0;
1764}
1765
c61393ea 1766static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1767{
9af28511
SH		 1768 if (addr == 0)
1769 return -1;
dfd982ba
YH		 1770 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1771 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1772 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1773 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1774 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1775 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1776 eui[1] = 0;
1777 eui[2] = 0x5E;
1778 eui[3] = 0xFE;
1779 memcpy(eui + 4, &addr, 4);
1780 return 0;
1781}
dfd982ba
YH		 1782
1783static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1784{
1785 if (dev->priv_flags & IFF_ISATAP)
1786 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1787 return -1;
1788}
1789
aee80b54 1790static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1791{
1792 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1793}
1794
e837735e
ND		 1795static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1796{
1797 memcpy(eui, dev->perm_addr, 3);
1798 memcpy(eui + 5, dev->perm_addr + 3, 3);
1799 eui[3] = 0xFF;
1800 eui[4] = 0xFE;
1801 eui[0] ^= 2;
1802 return 0;
1803}
1804
1da177e4
LT		 1805static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1806{
1807 switch (dev->type) {
1808 case ARPHRD_ETHER:
1809 case ARPHRD_FDDI:
073a8e0e 1810 return addrconf_ifid_eui48(eui, dev);
1da177e4 1811 case ARPHRD_ARCNET:
073a8e0e 1812 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1813 case ARPHRD_INFINIBAND:
073a8e0e 1814 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1815 case ARPHRD_SIT:
dfd982ba 1816 return addrconf_ifid_sit(eui, dev);
aee80b54 1817 case ARPHRD_IPGRE:
1818 return addrconf_ifid_gre(eui, dev);
06a4c1c5 1819 case ARPHRD_IEEE802154:
1820 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 1821 case ARPHRD_IEEE1394:
1822 return addrconf_ifid_ieee1394(eui, dev);
e837735e
ND		 1823 case ARPHRD_TUNNEL6:
1824 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 1825 }
1826 return -1;
1827}
1828
1829static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1830{
1831 int err = -1;
1832 struct inet6_ifaddr *ifp;
1833
1834 read_lock_bh(&idev->lock);
502a2ffd 1835 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 1836 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1837 memcpy(eui, ifp->addr.s6_addr+8, 8);
1838 err = 0;
1839 break;
1840 }
1841 }
1842 read_unlock_bh(&idev->lock);
1843 return err;
1844}
1845
1da177e4 1846/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 1847static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 1848{
1da177e4 1849regen:
955189ef 1850 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1851 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1852
1853 /*
1854 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1855 * check if generated address is not inappropriate
1856 *
1857 * - Reserved subnet anycast (RFC 2526)
1858 * 11111101 11....11 1xxxxxxx
c7dc89c0 1859 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1860 * 00-00-5E-FE-xx-xx-xx-xx
1861 * - value 0
1862 * - XXX: already assigned to an address on the device
1863 */
1ab1457c 1864 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1865 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1866 (idev->rndid[7]&0x80))
1867 goto regen;
1868 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1869 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1870 goto regen;
1871 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1872 goto regen;
1873 }
1da177e4
LT		 1874}
1875
1876static void ipv6_regen_rndid(unsigned long data)
1877{
1878 struct inet6_dev *idev = (struct inet6_dev *) data;
1879 unsigned long expires;
1880
8814c4b5 1881 rcu_read_lock_bh();
1da177e4
LT		 1882 write_lock_bh(&idev->lock);
1883
1884 if (idev->dead)
1885 goto out;
1886
eb7e0575 1887 __ipv6_regen_rndid(idev);
1ab1457c 1888
1da177e4 1889 expires = jiffies +
1ab1457c 1890 idev->cnf.temp_prefered_lft * HZ -
1f9248e5
JP		 1891 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
1892 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
784e2710 1893 idev->cnf.max_desync_factor * HZ;
1da177e4 1894 if (time_before(expires, jiffies)) {
f3213831
JP		 1895 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1896 __func__, idev->dev->name);
1da177e4
LT		 1897 goto out;
1898 }
1899
1900 if (!mod_timer(&idev->regen_timer, expires))
1901 in6_dev_hold(idev);
1902
1903out:
1904 write_unlock_bh(&idev->lock);
8814c4b5 1905 rcu_read_unlock_bh();
1da177e4
LT		 1906 in6_dev_put(idev);
1907}
1908
eb7e0575 1909static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 1910{
1da177e4 1911 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 1912 __ipv6_regen_rndid(idev);
1da177e4 1913}
1da177e4
LT		 1914
1915/*
1916 * Add prefix route.
1917 */
1918
1919static void
1920addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1921 unsigned long expires, u32 flags)
1da177e4 1922{
86872cb5
TG		 1923 struct fib6_config cfg = {
1924 .fc_table = RT6_TABLE_PREFIX,
1925 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1926 .fc_ifindex = dev->ifindex,
1927 .fc_expires = expires,
1928 .fc_dst_len = plen,
1929 .fc_flags = RTF_UP | flags,
c346dca1 1930 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1931 .fc_protocol = RTPROT_KERNEL,
86872cb5 1932 };
1da177e4 1933
4e3fd7a0 1934 cfg.fc_dst = *pfx;
1da177e4
LT		 1935
1936 /* Prevent useless cloning on PtP SIT.
1937 This thing is done here expecting that the whole
1938 class of non-broadcast devices need not cloning.
1939 */
07a93626 1940#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 1941 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1942 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1943#endif
1da177e4 1944
86872cb5 1945 ip6_route_add(&cfg);
1da177e4
LT		 1946}
1947
14ef37b6
AH		 1948
1949static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1950 int plen,
1951 const struct net_device *dev,
1952 u32 flags, u32 noflags)
1953{
1954 struct fib6_node *fn;
1955 struct rt6_info *rt = NULL;
1956 struct fib6_table *table;
1957
1958 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1959 if (table == NULL)
1960 return NULL;
1961
5744dd9b 1962 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 1963 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1964 if (!fn)
1965 goto out;
1966 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 1967 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 1968 continue;
1969 if ((rt->rt6i_flags & flags) != flags)
1970 continue;
85da53bf 1971 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 1972 continue;
1973 dst_hold(&rt->dst);
1974 break;
1975 }
1976out:
5744dd9b 1977 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 1978 return rt;
1979}
1980
1981
1da177e4
LT		 1982/* Create "default" multicast route to the interface */
1983
1984static void addrconf_add_mroute(struct net_device *dev)
1985{
86872cb5
TG		 1986 struct fib6_config cfg = {
1987 .fc_table = RT6_TABLE_LOCAL,
1988 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1989 .fc_ifindex = dev->ifindex,
1990 .fc_dst_len = 8,
1991 .fc_flags = RTF_UP,
c346dca1 1992 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1993 };
1994
1995 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1996
1997 ip6_route_add(&cfg);
1da177e4
LT		 1998}
1999
1da177e4
LT		 2000static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2001{
2002 struct inet6_dev *idev;
2003
2004 ASSERT_RTNL();
2005
e21e8467
SH		 2006 idev = ipv6_find_idev(dev);
2007 if (!idev)
64e724f6
BH		 2008 return ERR_PTR(-ENOBUFS);
2009
2010 if (idev->cnf.disable_ipv6)
2011 return ERR_PTR(-EACCES);
1da177e4
LT		 2012
2013 /* Add default multicast route */
4af04aba
LW		 2014 if (!(dev->flags & IFF_LOOPBACK))
2015 addrconf_add_mroute(dev);
1da177e4 2016
1da177e4
LT		 2017 return idev;
2018}
2019
53bd6749
JP		 2020static void manage_tempaddrs(struct inet6_dev *idev,
2021 struct inet6_ifaddr *ifp,
2022 __u32 valid_lft, __u32 prefered_lft,
2023 bool create, unsigned long now)
2024{
2025 u32 flags;
2026 struct inet6_ifaddr *ift;
2027
2028 read_lock_bh(&idev->lock);
2029 /* update all temporary addresses in the list */
2030 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2031 int age, max_valid, max_prefered;
2032
2033 if (ifp != ift->ifpub)
2034 continue;
2035
2036 /* RFC 4941 section 3.3:
2037 * If a received option will extend the lifetime of a public
2038 * address, the lifetimes of temporary addresses should
2039 * be extended, subject to the overall constraint that no
2040 * temporary addresses should ever remain "valid" or "preferred"
2041 * for a time longer than (TEMP_VALID_LIFETIME) or
2042 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2043 */
2044 age = (now - ift->cstamp) / HZ;
2045 max_valid = idev->cnf.temp_valid_lft - age;
2046 if (max_valid < 0)
2047 max_valid = 0;
2048
2049 max_prefered = idev->cnf.temp_prefered_lft -
2050 idev->cnf.max_desync_factor - age;
2051 if (max_prefered < 0)
2052 max_prefered = 0;
2053
2054 if (valid_lft > max_valid)
2055 valid_lft = max_valid;
2056
2057 if (prefered_lft > max_prefered)
2058 prefered_lft = max_prefered;
2059
2060 spin_lock(&ift->lock);
2061 flags = ift->flags;
2062 ift->valid_lft = valid_lft;
2063 ift->prefered_lft = prefered_lft;
2064 ift->tstamp = now;
2065 if (prefered_lft > 0)
2066 ift->flags &= ~IFA_F_DEPRECATED;
2067
2068 spin_unlock(&ift->lock);
2069 if (!(flags&IFA_F_TENTATIVE))
2070 ipv6_ifa_notify(0, ift);
2071 }
2072
2073 if ((create || list_empty(&idev->tempaddr_list)) &&
2074 idev->cnf.use_tempaddr > 0) {
2075 /* When a new public address is created as described
2076 * in [ADDRCONF], also create a new temporary address.
2077 * Also create a temporary address if it's enabled but
2078 * no temporary address currently exists.
2079 */
2080 read_unlock_bh(&idev->lock);
2081 ipv6_create_tempaddr(ifp, NULL);
2082 } else {
2083 read_unlock_bh(&idev->lock);
2084 }
2085}
2086
e6bff995 2087void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2088{
2089 struct prefix_info *pinfo;
2090 __u32 valid_lft;
2091 __u32 prefered_lft;
2092 int addr_type;
1da177e4 2093 struct inet6_dev *in6_dev;
56d417b1 2094 struct net *net = dev_net(dev);
1da177e4
LT		 2095
2096 pinfo = (struct prefix_info *) opt;
1ab1457c 2097
1da177e4 2098 if (len < sizeof(struct prefix_info)) {
ba3542e1 2099 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2100 return;
2101 }
1ab1457c 2102
1da177e4
LT		 2103 /*
2104 * Validation checks ([ADDRCONF], page 19)
2105 */
2106
2107 addr_type = ipv6_addr_type(&pinfo->prefix);
2108
2109 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2110 return;
2111
2112 valid_lft = ntohl(pinfo->valid);
2113 prefered_lft = ntohl(pinfo->prefered);
2114
2115 if (prefered_lft > valid_lft) {
e87cc472 2116 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2117 return;
2118 }
2119
2120 in6_dev = in6_dev_get(dev);
2121
2122 if (in6_dev == NULL) {
e87cc472
JP		 2123 net_dbg_ratelimited("addrconf: device %s not configured\n",
2124 dev->name);
1da177e4
LT		 2125 return;
2126 }
2127
2128 /*
2129 * Two things going on here:
2130 * 1) Add routes for on-link prefixes
2131 * 2) Configure prefixes with the auto flag set
2132 */
2133
4bed72e4
YH		 2134 if (pinfo->onlink) {
2135 struct rt6_info *rt;
2136 unsigned long rt_expires;
2137
6f704992
YH		 2138 /* Avoid arithmetic overflow. Really, we could
2139 * save rt_expires in seconds, likely valid_lft,
2140 * but it would require division in fib gc, that it
2141 * not good.
2142 */
4bed72e4
YH		 2143 if (HZ > USER_HZ)
2144 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2145 else
2146 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2147
4bed72e4
YH		 2148 if (addrconf_finite_timeout(rt_expires))
2149 rt_expires *= HZ;
1da177e4 2150
14ef37b6
AH		 2151 rt = addrconf_get_prefix_route(&pinfo->prefix,
2152 pinfo->prefix_len,
2153 dev,
2154 RTF_ADDRCONF | RTF_PREFIX_RT,
2155 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2156
14ef37b6 2157 if (rt) {
6f704992
YH		 2158 /* Autoconf prefix route */
2159 if (valid_lft == 0) {
2160 ip6_del_rt(rt);
2161 rt = NULL;
4bed72e4 2162 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2163 /* not infinity */
1716a961 2164 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2165 } else {
1716a961 2166 rt6_clean_expires(rt);
1da177e4
LT		 2167 }
2168 } else if (valid_lft) {
6f704992 2169 clock_t expires = 0;
4bed72e4
YH		 2170 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2171 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2172 /* not infinity */
2173 flags |= RTF_EXPIRES;
2174 expires = jiffies_to_clock_t(rt_expires);
2175 }
1da177e4 2176 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2177 dev, expires, flags);
1da177e4 2178 }
94e187c0 2179 ip6_rt_put(rt);
1da177e4
LT		 2180 }
2181
2182 /* Try to figure out our local address for this prefix */
2183
2184 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2185 struct inet6_ifaddr *ifp;
1da177e4
LT		 2186 struct in6_addr addr;
2187 int create = 0, update_lft = 0;
617fe29d 2188 bool tokenized = false;
1da177e4
LT		 2189
2190 if (pinfo->prefix_len == 64) {
2191 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2192
2193 if (!ipv6_addr_any(&in6_dev->token)) {
2194 read_lock_bh(&in6_dev->lock);
2195 memcpy(addr.s6_addr + 8,
2196 in6_dev->token.s6_addr + 8, 8);
2197 read_unlock_bh(&in6_dev->lock);
617fe29d 2198 tokenized = true;
f53adae4
DB		 2199 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2200 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1da177e4
LT		 2201 in6_dev_put(in6_dev);
2202 return;
2203 }
2204 goto ok;
2205 }
e87cc472
JP		 2206 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2207 pinfo->prefix_len);
1da177e4
LT		 2208 in6_dev_put(in6_dev);
2209 return;
2210
2211ok:
2212
53b7997f 2213 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 2214
2215 if (ifp == NULL && valid_lft) {
2216 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2217 u32 addr_flags = 0;
2218
2219#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2220 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2221 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 2222 addr_flags = IFA_F_OPTIMISTIC;
2223#endif
1da177e4
LT		 2224
2225 /* Do not allow to create too much of autoconfigured
2226 * addresses; this would be too easy way to crash kernel.
2227 */
2228 if (!max_addresses ||
2229 ipv6_count_addresses(in6_dev) < max_addresses)
3f8f5298
JP		 2230 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2231 pinfo->prefix_len,
95c385b4 2232 addr_type&IPV6_ADDR_SCOPE_MASK,
8a226b2c
JB		 2233 addr_flags, valid_lft,
2234 prefered_lft);
1da177e4 2235
3f0d2ba0 2236 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2237 in6_dev_put(in6_dev);
2238 return;
2239 }
2240
53bd6749 2241 ifp->flags |= IFA_F_MANAGETEMPADDR;
8a226b2c
JB		 2242 update_lft = 0;
2243 create = 1;
1da177e4 2244 ifp->cstamp = jiffies;
617fe29d 2245 ifp->tokenized = tokenized;
cf22f9a2 2246 addrconf_dad_start(ifp);
1da177e4
LT		 2247 }
2248
2249 if (ifp) {
479840ff 2250 u32 flags;
1da177e4 2251 unsigned long now;
1da177e4
LT		 2252 u32 stored_lft;
2253
2254 /* update lifetime (RFC2462 5.5.3 e) */
2255 spin_lock(&ifp->lock);
2256 now = jiffies;
2257 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2258 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2259 else
2260 stored_lft = 0;
8a226b2c 2261 if (!update_lft && !create && stored_lft) {
c9d55d5b
PM		 2262 const u32 minimum_lft = min(
2263 stored_lft, (u32)MIN_VALID_LIFETIME);
2264 valid_lft = max(valid_lft, minimum_lft);
2265
2266 /* RFC4862 Section 5.5.3e:
2267 * "Note that the preferred lifetime of the
2268 * corresponding address is always reset to
2269 * the Preferred Lifetime in the received
2270 * Prefix Information option, regardless of
2271 * whether the valid lifetime is also reset or
2272 * ignored."
2273 *
2274 * So we should always update prefered_lft here.
2275 */
2276 update_lft = 1;
1da177e4
LT		 2277 }
2278
2279 if (update_lft) {
2280 ifp->valid_lft = valid_lft;
2281 ifp->prefered_lft = prefered_lft;
2282 ifp->tstamp = now;
2283 flags = ifp->flags;
2284 ifp->flags &= ~IFA_F_DEPRECATED;
2285 spin_unlock(&ifp->lock);
2286
2287 if (!(flags&IFA_F_TENTATIVE))
2288 ipv6_ifa_notify(0, ifp);
2289 } else
2290 spin_unlock(&ifp->lock);
2291
53bd6749
JP		 2292 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2293 create, now);
5d9efa7e 2294
1da177e4
LT		 2295 in6_ifa_put(ifp);
2296 addrconf_verify(0);
2297 }
2298 }
2299 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2300 in6_dev_put(in6_dev);
2301}
2302
2303/*
2304 * Set destination address.
2305 * Special case for SIT interfaces where we create a new "virtual"
2306 * device.
2307 */
af284937 2308int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2309{
2310 struct in6_ifreq ireq;
2311 struct net_device *dev;
2312 int err = -EINVAL;
2313
2314 rtnl_lock();
2315
2316 err = -EFAULT;
2317 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2318 goto err_exit;
2319
af284937 2320 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2321
2322 err = -ENODEV;
2323 if (dev == NULL)
2324 goto err_exit;
2325
07a93626 2326#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2327 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2328 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2329 struct ifreq ifr;
1da177e4
LT		 2330 struct ip_tunnel_parm p;
2331
2332 err = -EADDRNOTAVAIL;
2333 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2334 goto err_exit;
2335
2336 memset(&p, 0, sizeof(p));
2337 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2338 p.iph.saddr = 0;
2339 p.iph.version = 4;
2340 p.iph.ihl = 5;
2341 p.iph.protocol = IPPROTO_IPV6;
2342 p.iph.ttl = 64;
d20b3109 2343 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2344
5bc3eb7e
SH		 2345 if (ops->ndo_do_ioctl) {
2346 mm_segment_t oldfs = get_fs();
2347
2348 set_fs(KERNEL_DS);
2349 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2350 set_fs(oldfs);
2351 } else
2352 err = -EOPNOTSUPP;
1da177e4
LT		 2353
2354 if (err == 0) {
2355 err = -ENOBUFS;
af284937
DL		 2356 dev = __dev_get_by_name(net, p.name);
2357 if (!dev)
1da177e4
LT		 2358 goto err_exit;
2359 err = dev_open(dev);
2360 }
2361 }
0be669bb 2362#endif
1da177e4
LT		 2363
2364err_exit:
2365 rtnl_unlock();
2366 return err;
2367}
2368
2369/*
2370 * Manual configuration of address on an interface
2371 */
479840ff
JP		 2372static int inet6_addr_add(struct net *net, int ifindex,
2373 const struct in6_addr *pfx,
caeaba79 2374 const struct in6_addr *peer_pfx,
479840ff
JP		 2375 unsigned int plen, __u32 ifa_flags,
2376 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2377{
2378 struct inet6_ifaddr *ifp;
2379 struct inet6_dev *idev;
2380 struct net_device *dev;
2381 int scope;
6f704992
YH		 2382 u32 flags;
2383 clock_t expires;
4bed72e4 2384 unsigned long timeout;
1da177e4
LT		 2385
2386 ASSERT_RTNL();
1ab1457c 2387
24ef0da7
TG		 2388 if (plen > 128)
2389 return -EINVAL;
2390
0778769d
NT		 2391 /* check the lifetime */
2392 if (!valid_lft || prefered_lft > valid_lft)
2393 return -EINVAL;
2394
53bd6749
JP		 2395 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2396 return -EINVAL;
2397
af284937
DL		 2398 dev = __dev_get_by_index(net, ifindex);
2399 if (!dev)
1da177e4 2400 return -ENODEV;
1ab1457c 2401
64e724f6
BH		 2402 idev = addrconf_add_dev(dev);
2403 if (IS_ERR(idev))
2404 return PTR_ERR(idev);
1da177e4
LT		 2405
2406 scope = ipv6_addr_scope(pfx);
2407
4bed72e4
YH		 2408 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2409 if (addrconf_finite_timeout(timeout)) {
2410 expires = jiffies_to_clock_t(timeout * HZ);
2411 valid_lft = timeout;
6f704992 2412 flags = RTF_EXPIRES;
4bed72e4
YH		 2413 } else {
2414 expires = 0;
2415 flags = 0;
2416 ifa_flags |= IFA_F_PERMANENT;
6f704992 2417 }
0778769d 2418
4bed72e4
YH		 2419 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2420 if (addrconf_finite_timeout(timeout)) {
2421 if (timeout == 0)
2422 ifa_flags |= IFA_F_DEPRECATED;
2423 prefered_lft = timeout;
2424 }
0778769d 2425
8a226b2c
JB		 2426 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2427 valid_lft, prefered_lft);
0778769d 2428
1da177e4 2429 if (!IS_ERR(ifp)) {
46d48046 2430 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2431 expires, flags);
95c385b4
NH		 2432 /*
2433 * Note that section 3.1 of RFC 4429 indicates
2434 * that the Optimistic flag should not be set for
2435 * manually configured addresses
2436 */
cf22f9a2 2437 addrconf_dad_start(ifp);
53bd6749
JP		 2438 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2439 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2440 true, jiffies);
1da177e4 2441 in6_ifa_put(ifp);
0778769d 2442 addrconf_verify(0);
1da177e4
LT		 2443 return 0;
2444 }
2445
2446 return PTR_ERR(ifp);
2447}
2448
b71d1d42 2449static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2450 unsigned int plen)
1da177e4
LT		 2451{
2452 struct inet6_ifaddr *ifp;
2453 struct inet6_dev *idev;
2454 struct net_device *dev;
1ab1457c 2455
24ef0da7
TG		 2456 if (plen > 128)
2457 return -EINVAL;
2458
af284937
DL		 2459 dev = __dev_get_by_index(net, ifindex);
2460 if (!dev)
1da177e4
LT		 2461 return -ENODEV;
2462
7eaa48a4 2463 if ((idev = __in6_dev_get(dev)) == NULL)
1da177e4
LT		 2464 return -ENXIO;
2465
2466 read_lock_bh(&idev->lock);
502a2ffd 2467 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2468 if (ifp->prefix_len == plen &&
2469 ipv6_addr_equal(pfx, &ifp->addr)) {
2470 in6_ifa_hold(ifp);
2471 read_unlock_bh(&idev->lock);
1ab1457c 2472
1da177e4 2473 ipv6_del_addr(ifp);
1da177e4
LT		 2474 return 0;
2475 }
2476 }
2477 read_unlock_bh(&idev->lock);
2478 return -EADDRNOTAVAIL;
2479}
2480
2481
af284937 2482int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2483{
2484 struct in6_ifreq ireq;
2485 int err;
1ab1457c 2486
af31f412 2487 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2488 return -EPERM;
1ab1457c 2489
1da177e4
LT		 2490 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2491 return -EFAULT;
2492
2493 rtnl_lock();
caeaba79 2494 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2495 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2496 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2497 rtnl_unlock();
2498 return err;
2499}
2500
af284937 2501int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2502{
2503 struct in6_ifreq ireq;
2504 int err;
1ab1457c 2505
af31f412 2506 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2507 return -EPERM;
2508
2509 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2510 return -EFAULT;
2511
2512 rtnl_lock();
af284937
DL		 2513 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2514 ireq.ifr6_prefixlen);
1da177e4
LT		 2515 rtnl_unlock();
2516 return err;
2517}
2518
b5f348e5
IJ		 2519static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2520 int plen, int scope)
2521{
2522 struct inet6_ifaddr *ifp;
2523
8a226b2c
JB		 2524 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2525 scope, IFA_F_PERMANENT, 0, 0);
b5f348e5
IJ		 2526 if (!IS_ERR(ifp)) {
2527 spin_lock_bh(&ifp->lock);
2528 ifp->flags &= ~IFA_F_TENTATIVE;
2529 spin_unlock_bh(&ifp->lock);
2530 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2531 in6_ifa_put(ifp);
2532 }
2533}
2534
07a93626 2535#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2536static void sit_add_v4_addrs(struct inet6_dev *idev)
2537{
1da177e4
LT		 2538 struct in6_addr addr;
2539 struct net_device *dev;
c346dca1 2540 struct net *net = dev_net(idev->dev);
929c9cf3 2541 int scope, plen;
f0e2acfa 2542 u32 pflags = 0;
1da177e4
LT		 2543
2544 ASSERT_RTNL();
2545
2546 memset(&addr, 0, sizeof(struct in6_addr));
2547 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2548
2549 if (idev->dev->flags&IFF_POINTOPOINT) {
2550 addr.s6_addr32[0] = htonl(0xfe800000);
2551 scope = IFA_LINK;
929c9cf3 2552 plen = 64;
1da177e4
LT		 2553 } else {
2554 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2555 plen = 96;
f0e2acfa 2556 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2557 }
2558
2559 if (addr.s6_addr32[3]) {
929c9cf3 2560 add_addr(idev, &addr, plen, scope);
f0e2acfa 2561 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2562 return;
2563 }
2564
6fda7350 2565 for_each_netdev(net, dev) {
8e5e8f30 2566 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2567 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2568 struct in_ifaddr *ifa;
1da177e4
LT		 2569
2570 int flag = scope;
2571
2572 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2573
2574 addr.s6_addr32[3] = ifa->ifa_local;
2575
2576 if (ifa->ifa_scope == RT_SCOPE_LINK)
2577 continue;
2578 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2579 if (idev->dev->flags&IFF_POINTOPOINT)
2580 continue;
2581 flag |= IFA_HOST;
2582 }
1da177e4 2583
b5f348e5 2584 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2585 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2586 pflags);
1da177e4
LT		 2587 }
2588 }
1ab1457c 2589 }
1da177e4 2590}
0be669bb 2591#endif
1da177e4
LT		 2592
2593static void init_loopback(struct net_device *dev)
2594{
2595 struct inet6_dev *idev;
25fb6ca4
BK		 2596 struct net_device *sp_dev;
2597 struct inet6_ifaddr *sp_ifa;
2598 struct rt6_info *sp_rt;
1da177e4
LT		 2599
2600 /* ::1 */
2601
2602 ASSERT_RTNL();
2603
7eaa48a4 2604 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2605 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2606 return;
2607 }
2608
b5f348e5 2609 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2610
2611 /* Add routes to other interface's IPv6 addresses */
2612 for_each_netdev(dev_net(dev), sp_dev) {
2613 if (!strcmp(sp_dev->name, dev->name))
2614 continue;
2615
2616 idev = __in6_dev_get(sp_dev);
2617 if (!idev)
2618 continue;
2619
2620 read_lock_bh(&idev->lock);
2621 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2622
2623 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2624 continue;
2625
a881ae1f
G		 2626 if (sp_ifa->rt)
2627 continue;
2628
57ec0afe 2629 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 2630
2631 /* Failure cases are ignored */
534c8779
G		 2632 if (!IS_ERR(sp_rt)) {
2633 sp_ifa->rt = sp_rt;
25fb6ca4 2634 ip6_ins_rt(sp_rt);
534c8779 2635 }
25fb6ca4
BK		 2636 }
2637 read_unlock_bh(&idev->lock);
2638 }
1da177e4
LT		 2639}
2640
b71d1d42 2641static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4 2642{
8e5e8f30 2643 struct inet6_ifaddr *ifp;
95c385b4
NH		 2644 u32 addr_flags = IFA_F_PERMANENT;
2645
2646#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2647 if (idev->cnf.optimistic_dad &&
702beb87 2648 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2649 addr_flags |= IFA_F_OPTIMISTIC;
2650#endif
1da177e4 2651
95c385b4 2652
8a226b2c 2653 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 0, 0);
1da177e4 2654 if (!IS_ERR(ifp)) {
46d48046 2655 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2656 addrconf_dad_start(ifp);
1da177e4
LT		 2657 in6_ifa_put(ifp);
2658 }
2659}
2660
2661static void addrconf_dev_config(struct net_device *dev)
2662{
2663 struct in6_addr addr;
8e5e8f30 2664 struct inet6_dev *idev;
1da177e4
LT		 2665
2666 ASSERT_RTNL();
2667
74235a25
HX		 2668 if ((dev->type != ARPHRD_ETHER) &&
2669 (dev->type != ARPHRD_FDDI) &&
74235a25 2670 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 2671 (dev->type != ARPHRD_INFINIBAND) &&
cb6bf355 2672 (dev->type != ARPHRD_IEEE802154) &&
e837735e
ND		 2673 (dev->type != ARPHRD_IEEE1394) &&
2674 (dev->type != ARPHRD_TUNNEL6)) {
74235a25
HX		 2675 /* Alas, we support only Ethernet autoconfiguration. */
2676 return;
2677 }
2678
1da177e4 2679 idev = addrconf_add_dev(dev);
64e724f6 2680 if (IS_ERR(idev))
1da177e4
LT		 2681 return;
2682
2683 memset(&addr, 0, sizeof(struct in6_addr));
2684 addr.s6_addr32[0] = htonl(0xFE800000);
2685
2686 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2687 addrconf_add_linklocal(idev, &addr);
2688}
2689
07a93626 2690#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2691static void addrconf_sit_config(struct net_device *dev)
2692{
2693 struct inet6_dev *idev;
2694
2695 ASSERT_RTNL();
2696
1ab1457c
YH		 2697 /*
2698 * Configure the tunnel with one of our IPv4
2699 * addresses... we should configure all of
1da177e4
LT		 2700 * our v4 addrs in the tunnel
2701 */
2702
7eaa48a4 2703 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2704 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2705 return;
2706 }
2707
c7dc89c0
FT		 2708 if (dev->priv_flags & IFF_ISATAP) {
2709 struct in6_addr addr;
2710
2711 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
c7dc89c0
FT		 2712 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2713 addrconf_add_linklocal(idev, &addr);
2714 return;
2715 }
2716
1da177e4
LT		 2717 sit_add_v4_addrs(idev);
2718
62b54dd9 2719 if (dev->flags&IFF_POINTOPOINT)
1da177e4 2720 addrconf_add_mroute(dev);
1da177e4 2721}
0be669bb 2722#endif
1da177e4 2723
07a93626 2724#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2725static void addrconf_gre_config(struct net_device *dev)
2726{
2727 struct inet6_dev *idev;
2728 struct in6_addr addr;
2729
aee80b54 2730 ASSERT_RTNL();
2731
7eaa48a4 2732 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2733 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 2734 return;
2735 }
2736
2737 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
aee80b54 2738 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2739 addrconf_add_linklocal(idev, &addr);
2740}
2741#endif
2742
1da177e4
LT		 2743static inline int
2744ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2745{
2746 struct in6_addr lladdr;
2747
95c385b4 2748 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2749 addrconf_add_linklocal(idev, &lladdr);
2750 return 0;
2751 }
2752 return -1;
2753}
2754
1ab1457c 2755static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 2756 void *ptr)
1da177e4 2757{
351638e7 2758 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 2759 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2760 int run_pending = 0;
b217d616 2761 int err;
1da177e4 2762
e21e8467 2763 switch (event) {
45ba9dd2 2764 case NETDEV_REGISTER:
74235a25 2765 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2766 idev = ipv6_add_dev(dev);
2767 if (!idev)
b217d616 2768 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2769 }
2770 break;
bcdd553f 2771
1da177e4 2772 case NETDEV_UP:
3c21edbd 2773 case NETDEV_CHANGE:
c2edacf8
JV		 2774 if (dev->flags & IFF_SLAVE)
2775 break;
2776
3c21edbd 2777 if (event == NETDEV_UP) {
f24e3d65 2778 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 2779 /* device is not ready yet. */
f3213831 2780 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 2781 dev->name);
2782 break;
2783 }
99081049 2784
d31c7b8f
EP		 2785 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2786 idev = ipv6_add_dev(dev);
2787
e3ec6cfc 2788 if (idev) {
99081049 2789 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2790 run_pending = 1;
2791 }
3c21edbd 2792 } else {
f24e3d65 2793 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2794 /* device is still not ready. */
2795 break;
2796 }
2797
2798 if (idev) {
bcdd553f 2799 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2800 /* device is already configured. */
2801 break;
3c21edbd
YH		 2802 idev->if_flags |= IF_READY;
2803 }
2804
f3213831
JP		 2805 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2806 dev->name);
3c21edbd 2807
c5e33bdd 2808 run_pending = 1;
3c21edbd
YH		 2809 }
2810
e21e8467 2811 switch (dev->type) {
07a93626 2812#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2813 case ARPHRD_SIT:
2814 addrconf_sit_config(dev);
2815 break;
aee80b54 2816#endif
07a93626 2817#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2818 case ARPHRD_IPGRE:
2819 addrconf_gre_config(dev);
2820 break;
0be669bb 2821#endif
1da177e4
LT		 2822 case ARPHRD_LOOPBACK:
2823 init_loopback(dev);
2824 break;
2825
2826 default:
2827 addrconf_dev_config(dev);
2828 break;
3ff50b79 2829 }
bcdd553f 2830
1da177e4 2831 if (idev) {
c5e33bdd
YH		 2832 if (run_pending)
2833 addrconf_dad_run(idev);
2834
bcdd553f
SH		 2835 /*
2836 * If the MTU changed during the interface down,
2837 * when the interface up, the changed MTU must be
2838 * reflected in the idev as well as routers.
1da177e4 2839 */
bcdd553f
SH		 2840 if (idev->cnf.mtu6 != dev->mtu &&
2841 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2842 rt6_mtu_change(dev, dev->mtu);
2843 idev->cnf.mtu6 = dev->mtu;
2844 }
2845 idev->tstamp = jiffies;
2846 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2847
2848 /*
2849 * If the changed mtu during down is lower than
2850 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2851 */
2852 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2853 addrconf_ifdown(dev, 1);
1da177e4
LT		 2854 }
2855 break;
2856
2857 case NETDEV_CHANGEMTU:
d31c7b8f 2858 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2859 rt6_mtu_change(dev, dev->mtu);
2860 idev->cnf.mtu6 = dev->mtu;
2861 break;
2862 }
2863
d31c7b8f
EP		 2864 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2865 idev = ipv6_add_dev(dev);
2866 if (idev)
2867 break;
2868 }
2869
bcdd553f
SH		 2870 /*
2871 * MTU falled under IPV6_MIN_MTU.
2872 * Stop IPv6 on this interface.
2873 */
1da177e4
LT		 2874
2875 case NETDEV_DOWN:
2876 case NETDEV_UNREGISTER:
2877 /*
2878 * Remove all addresses from this interface.
2879 */
2880 addrconf_ifdown(dev, event != NETDEV_DOWN);
2881 break;
3c21edbd 2882
1da177e4 2883 case NETDEV_CHANGENAME:
1da177e4 2884 if (idev) {
5632c515 2885 snmp6_unregister_dev(idev);
408c4768 2886 addrconf_sysctl_unregister(idev);
f52295a9 2887 addrconf_sysctl_register(idev);
b217d616
HX		 2888 err = snmp6_register_dev(idev);
2889 if (err)
2890 return notifier_from_errno(err);
5632c515 2891 }
1da177e4 2892 break;
bcdd553f 2893
93d9b7d7
JP		 2894 case NETDEV_PRE_TYPE_CHANGE:
2895 case NETDEV_POST_TYPE_CHANGE:
2896 addrconf_type_change(dev, event);
75c78500 2897 break;
3ff50b79 2898 }
1da177e4
LT		 2899
2900 return NOTIFY_OK;
2901}
2902
2903/*
2904 * addrconf module should be notified of a device going up
2905 */
2906static struct notifier_block ipv6_dev_notf = {
2907 .notifier_call = addrconf_notify,
1da177e4
LT		 2908};
2909
93d9b7d7 2910static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2911{
2912 struct inet6_dev *idev;
2913 ASSERT_RTNL();
2914
2915 idev = __in6_dev_get(dev);
2916
93d9b7d7 2917 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2918 ipv6_mc_remap(idev);
93d9b7d7 2919 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2920 ipv6_mc_unmap(idev);
2921}
2922
1da177e4
LT		 2923static int addrconf_ifdown(struct net_device *dev, int how)
2924{
c346dca1 2925 struct net *net = dev_net(dev);
502a2ffd 2926 struct inet6_dev *idev;
2927 struct inet6_ifaddr *ifa;
73a8bd74 2928 int state, i;
1da177e4
LT		 2929
2930 ASSERT_RTNL();
2931
73a8bd74
DM		 2932 rt6_ifdown(net, dev);
2933 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 2934
2935 idev = __in6_dev_get(dev);
2936 if (idev == NULL)
2937 return -ENODEV;
2938
bcdd553f
SH		 2939 /*
2940 * Step 1: remove reference to ipv6 device from parent device.
2941 * Do not dev_put!
1da177e4 2942 */
439e2385 2943 if (how) {
1da177e4 2944 idev->dead = 1;
8814c4b5
YH		 2945
2946 /* protected by rtnl_lock */
a9b3cd7f 2947 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 2948
2949 /* Step 1.5: remove snmp6 entry */
2950 snmp6_unregister_dev(idev);
2951
2952 }
2953
73a8bd74
DM		 2954 /* Step 2: clear hash table */
2955 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2956 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 2957
2958 spin_lock_bh(&addrconf_hash_lock);
2959 restart:
b67bfe0d 2960 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74
DM		 2961 if (ifa->idev == idev) {
2962 hlist_del_init_rcu(&ifa->addr_lst);
b7b1bfce 2963 addrconf_del_dad_timer(ifa);
73a8bd74
DM		 2964 goto restart;
2965 }
2966 }
2967 spin_unlock_bh(&addrconf_hash_lock);
2968 }
2969
1da177e4
LT		 2970 write_lock_bh(&idev->lock);
2971
b7b1bfce
HFS		 2972 addrconf_del_rs_timer(idev);
2973
bcdd553f 2974 /* Step 2: clear flags for stateless addrconf */
439e2385 2975 if (!how)
3c21edbd 2976 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 2977
439e2385 2978 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2979 in6_dev_put(idev);
2980
bcdd553f 2981 /* Step 3: clear tempaddr list */
372e6c8f 2982 while (!list_empty(&idev->tempaddr_list)) {
2983 ifa = list_first_entry(&idev->tempaddr_list,
2984 struct inet6_ifaddr, tmp_list);
2985 list_del(&ifa->tmp_list);
1da177e4
LT		 2986 write_unlock_bh(&idev->lock);
2987 spin_lock_bh(&ifa->lock);
2988
2989 if (ifa->ifpub) {
2990 in6_ifa_put(ifa->ifpub);
2991 ifa->ifpub = NULL;
2992 }
2993 spin_unlock_bh(&ifa->lock);
2994 in6_ifa_put(ifa);
2995 write_lock_bh(&idev->lock);
2996 }
8f37ada5 2997
502a2ffd 2998 while (!list_empty(&idev->addr_list)) {
2999 ifa = list_first_entry(&idev->addr_list,
3000 struct inet6_ifaddr, if_list);
b7b1bfce 3001 addrconf_del_dad_timer(ifa);
84e8b803 3002
73a8bd74 3003 list_del(&ifa->if_list);
84e8b803 3004
73a8bd74 3005 write_unlock_bh(&idev->lock);
84e8b803 3006
73a8bd74
DM		 3007 spin_lock_bh(&ifa->state_lock);
3008 state = ifa->state;
3009 ifa->state = INET6_IFADDR_STATE_DEAD;
3010 spin_unlock_bh(&ifa->state_lock);
9d82ca98 3011
73a8bd74
DM		 3012 if (state != INET6_IFADDR_STATE_DEAD) {
3013 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3014 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 3015 }
73a8bd74 3016 in6_ifa_put(ifa);
8f37ada5 3017
73a8bd74
DM		 3018 write_lock_bh(&idev->lock);
3019 }
8f37ada5 3020
1da177e4
LT		 3021 write_unlock_bh(&idev->lock);
3022
3023 /* Step 5: Discard multicast list */
439e2385 3024 if (how)
1da177e4
LT		 3025 ipv6_mc_destroy_dev(idev);
3026 else
3027 ipv6_mc_down(idev);
3028
1da177e4 3029 idev->tstamp = jiffies;
1ab1457c 3030
bcdd553f 3031 /* Last: Shot the device (if unregistered) */
439e2385 3032 if (how) {
408c4768 3033 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3034 neigh_parms_release(&nd_tbl, idev->nd_parms);
3035 neigh_ifdown(&nd_tbl, dev);
3036 in6_dev_put(idev);
3037 }
3038 return 0;
3039}
3040
3041static void addrconf_rs_timer(unsigned long data)
3042{
b7b1bfce 3043 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3044 struct net_device *dev = idev->dev;
b7b1bfce 3045 struct in6_addr lladdr;
1da177e4 3046
b7b1bfce 3047 write_lock(&idev->lock);
5b2a1953 3048 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3049 goto out;
3050
9ba2add3 3051 if (!ipv6_accept_ra(idev))
5b2a1953 3052 goto out;
3053
3054 /* Announcement received after solicitation was sent */
3055 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3056 goto out;
1da177e4 3057
b7b1bfce 3058 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
caf92bc4
CW		 3059 write_unlock(&idev->lock);
3060 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3061 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3062 &in6addr_linklocal_allrouters);
3063 else
caf92bc4 3064 goto put;
1da177e4 3065
caf92bc4 3066 write_lock(&idev->lock);
b7b1bfce
HFS		 3067 /* The wait after the last probe can be shorter */
3068 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3069 idev->cnf.rtr_solicits) ?
3070 idev->cnf.rtr_solicit_delay :
3071 idev->cnf.rtr_solicit_interval);
1da177e4 3072 } else {
1da177e4
LT		 3073 /*
3074 * Note: we do not support deprecated "all on-link"
3075 * assumption any longer.
3076 */
91df42be 3077 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3078 }
3079
3080out:
b7b1bfce 3081 write_unlock(&idev->lock);
caf92bc4 3082put:
b7b1bfce 3083 in6_dev_put(idev);
1da177e4
LT		 3084}
3085
3086/*
3087 * Duplicate Address Detection
3088 */
3c21edbd
YH		 3089static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3090{
3091 unsigned long rand_num;
3092 struct inet6_dev *idev = ifp->idev;
3093
95c385b4
NH		 3094 if (ifp->flags & IFA_F_OPTIMISTIC)
3095 rand_num = 0;
3096 else
3097 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3098
b7b1bfce
HFS		 3099 ifp->dad_probes = idev->cnf.dad_transmits;
3100 addrconf_mod_dad_timer(ifp, rand_num);
3c21edbd
YH		 3101}
3102
cf22f9a2 3103static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4
LT		 3104{
3105 struct inet6_dev *idev = ifp->idev;
3106 struct net_device *dev = idev->dev;
1da177e4
LT		 3107
3108 addrconf_join_solict(dev, &ifp->addr);
3109
1da177e4 3110 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 3111
3112 read_lock_bh(&idev->lock);
622ccdf1 3113 spin_lock(&ifp->lock);
e9d3e084 3114 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3115 goto out;
1da177e4
LT		 3116
3117 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3118 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3119 !(ifp->flags&IFA_F_TENTATIVE) ||
3120 ifp->flags & IFA_F_NODAD) {
cc411d0b 3121 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3122 spin_unlock(&ifp->lock);
1da177e4
LT		 3123 read_unlock_bh(&idev->lock);
3124
3125 addrconf_dad_completed(ifp);
3126 return;
3127 }
3128
6732bade 3129 if (!(idev->if_flags & IF_READY)) {
21809faf 3130 spin_unlock(&ifp->lock);
6732bade 3131 read_unlock_bh(&idev->lock);
3c21edbd 3132 /*
590a9887 3133 * If the device is not ready:
3c21edbd
YH		 3134 * - keep it tentative if it is a permanent address.
3135 * - otherwise, kill it.
3136 */
3137 in6_ifa_hold(ifp);
cc411d0b 3138 addrconf_dad_stop(ifp, 0);
6732bade 3139 return;
3c21edbd 3140 }
95c385b4
NH		 3141
3142 /*
3143 * Optimistic nodes can start receiving
3144 * Frames right away
3145 */
e21e8467 3146 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 3147 ip6_ins_rt(ifp->rt);
3148
6732bade 3149 addrconf_dad_kick(ifp);
1da177e4 3150out:
622ccdf1 3151 spin_unlock(&ifp->lock);
1da177e4
LT		 3152 read_unlock_bh(&idev->lock);
3153}
3154
3155static void addrconf_dad_timer(unsigned long data)
3156{
3157 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3158 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3159 struct in6_addr mcaddr;
3160
b7b1bfce 3161 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3162 goto out;
3163
b7b1bfce 3164 write_lock(&idev->lock);
122e4519 3165 if (idev->dead || !(idev->if_flags & IF_READY)) {
b7b1bfce 3166 write_unlock(&idev->lock);
1da177e4
LT		 3167 goto out;
3168 }
21809faf 3169
3170 spin_lock(&ifp->lock);
622ccdf1
HX		 3171 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3172 spin_unlock(&ifp->lock);
b7b1bfce 3173 write_unlock(&idev->lock);
622ccdf1
HX		 3174 goto out;
3175 }
3176
b7b1bfce 3177 if (ifp->dad_probes == 0) {
1da177e4
LT		 3178 /*
3179 * DAD was successful
3180 */
3181
cc411d0b 3182 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3183 spin_unlock(&ifp->lock);
b7b1bfce 3184 write_unlock(&idev->lock);
1da177e4
LT		 3185
3186 addrconf_dad_completed(ifp);
3187
3188 goto out;
3189 }
3190
b7b1bfce 3191 ifp->dad_probes--;
1f9248e5
JP		 3192 addrconf_mod_dad_timer(ifp,
3193 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3194 spin_unlock(&ifp->lock);
b7b1bfce 3195 write_unlock(&idev->lock);
1da177e4
LT		 3196
3197 /* send a neighbour solicitation for our addr */
1da177e4 3198 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3199 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3200out:
3201 in6_ifa_put(ifp);
3202}
3203
3204static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3205{
e21e8467 3206 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3207 struct in6_addr lladdr;
b173ee48 3208 bool send_rs, send_mld;
b7b1bfce
HFS		 3209
3210 addrconf_del_dad_timer(ifp);
1da177e4
LT		 3211
3212 /*
3213 * Configure the address for reception. Now it is valid.
3214 */
3215
3216 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3217
026359bc
TA		 3218 /* If added prefix is link local and we are prepared to process
3219 router advertisements, start sending router solicitations.
1da177e4
LT		 3220 */
3221
1ec047eb
HFS		 3222 read_lock_bh(&ifp->idev->lock);
3223 spin_lock(&ifp->lock);
b173ee48
HFS		 3224 send_mld = ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL &&
3225 ifp->idev->valid_ll_addr_cnt == 1;
3226 send_rs = send_mld &&
3227 ipv6_accept_ra(ifp->idev) &&
1ec047eb 3228 ifp->idev->cnf.rtr_solicits > 0 &&
b173ee48 3229 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 3230 spin_unlock(&ifp->lock);
3231 read_unlock_bh(&ifp->idev->lock);
3232
b173ee48
HFS		 3233 /* While dad is in progress mld report's source address is in6_addrany.
3234 * Resend with proper ll now.
3235 */
3236 if (send_mld)
3237 ipv6_mc_dad_complete(ifp->idev);
3238
1ec047eb 3239 if (send_rs) {
1da177e4
LT		 3240 /*
3241 * If a host as already performed a random delay
3242 * [...] as part of DAD [...] there is no need
3243 * to delay again before sending the first RS
3244 */
1ec047eb 3245 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 3246 return;
1ec047eb 3247 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 3248
b7b1bfce
HFS		 3249 write_lock_bh(&ifp->idev->lock);
3250 spin_lock(&ifp->lock);
3251 ifp->idev->rs_probes = 1;
1da177e4 3252 ifp->idev->if_flags |= IF_RS_SENT;
b7b1bfce
HFS		 3253 addrconf_mod_rs_timer(ifp->idev,
3254 ifp->idev->cnf.rtr_solicit_interval);
3255 spin_unlock(&ifp->lock);
3256 write_unlock_bh(&ifp->idev->lock);
1da177e4
LT		 3257 }
3258}
3259
e21e8467
SH		 3260static void addrconf_dad_run(struct inet6_dev *idev)
3261{
c5e33bdd
YH		 3262 struct inet6_ifaddr *ifp;
3263
3264 read_lock_bh(&idev->lock);
502a2ffd 3265 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3266 spin_lock(&ifp->lock);
f2344a13
HX		 3267 if (ifp->flags & IFA_F_TENTATIVE &&
3268 ifp->state == INET6_IFADDR_STATE_DAD)
3269 addrconf_dad_kick(ifp);
21809faf 3270 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3271 }
3272 read_unlock_bh(&idev->lock);
3273}
3274
1da177e4
LT		 3275#ifdef CONFIG_PROC_FS
3276struct if6_iter_state {
3c40090a 3277 struct seq_net_private p;
1da177e4 3278 int bucket;
1d578303 3279 int offset;
1da177e4
LT		 3280};
3281
1d578303 3282static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3283{
3284 struct inet6_ifaddr *ifa = NULL;
3285 struct if6_iter_state *state = seq->private;
1218854a 3286 struct net *net = seq_file_net(seq);
1d578303 3287 int p = 0;
1da177e4 3288
1d578303
MM		 3289 /* initial bucket if pos is 0 */
3290 if (pos == 0) {
3291 state->bucket = 0;
3292 state->offset = 0;
3293 }
3294
3295 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3296 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3297 addr_lst) {
9f0d3c27
ED		 3298 if (!net_eq(dev_net(ifa->idev->dev), net))
3299 continue;
1d578303
MM		 3300 /* sync with offset */
3301 if (p < state->offset) {
3302 p++;
3303 continue;
3304 }
3305 state->offset++;
9f0d3c27 3306 return ifa;
1d578303
MM		 3307 }
3308
3309 /* prepare for next bucket */
3310 state->offset = 0;
3311 p = 0;
1da177e4 3312 }
c2e21293 3313 return NULL;
1da177e4
LT		 3314}
3315
c2e21293 3316static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3317 struct inet6_ifaddr *ifa)
1da177e4
LT		 3318{
3319 struct if6_iter_state *state = seq->private;
1218854a 3320 struct net *net = seq_file_net(seq);
1da177e4 3321
b67bfe0d 3322 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3323 if (!net_eq(dev_net(ifa->idev->dev), net))
3324 continue;
1d578303 3325 state->offset++;
9f0d3c27 3326 return ifa;
1d578303 3327 }
3c40090a 3328
c2e21293 3329 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3330 state->offset = 0;
b67bfe0d 3331 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3332 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3333 if (!net_eq(dev_net(ifa->idev->dev), net))
3334 continue;
1d578303 3335 state->offset++;
9f0d3c27 3336 return ifa;
c2e21293 3337 }
1da177e4 3338 }
3c40090a 3339
c2e21293 3340 return NULL;
1da177e4
LT		 3341}
3342
1da177e4 3343static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3344 __acquires(rcu_bh)
1da177e4 3345{
5c578aed 3346 rcu_read_lock_bh();
1d578303 3347 return if6_get_first(seq, *pos);
1da177e4
LT		 3348}
3349
3350static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3351{
3352 struct inet6_ifaddr *ifa;
3353
3354 ifa = if6_get_next(seq, v);
3355 ++*pos;
3356 return ifa;
3357}
3358
3359static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3360 __releases(rcu_bh)
1da177e4 3361{
5c578aed 3362 rcu_read_unlock_bh();
1da177e4
LT		 3363}
3364
3365static int if6_seq_show(struct seq_file *seq, void *v)
3366{
3367 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
479840ff 3368 seq_printf(seq, "%pi6 %02x %02x %02x %03x %8s\n",
b071195d 3369 &ifp->addr,
1da177e4
LT		 3370 ifp->idev->dev->ifindex,
3371 ifp->prefix_len,
3372 ifp->scope,
3373 ifp->flags,
3374 ifp->idev->dev->name);
3375 return 0;
3376}
3377
56b3d975 3378static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3379 .start = if6_seq_start,
3380 .next = if6_seq_next,
3381 .show = if6_seq_show,
3382 .stop = if6_seq_stop,
3383};
3384
3385static int if6_seq_open(struct inode *inode, struct file *file)
3386{
3c40090a
DL		 3387 return seq_open_net(inode, file, &if6_seq_ops,
3388 sizeof(struct if6_iter_state));
1da177e4
LT		 3389}
3390
9a32144e 3391static const struct file_operations if6_fops = {
1da177e4
LT		 3392 .owner = THIS_MODULE,
3393 .open = if6_seq_open,
3394 .read = seq_read,
3395 .llseek = seq_lseek,
3c40090a 3396 .release = seq_release_net,
1da177e4
LT		 3397};
3398
2c8c1e72 3399static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3400{
d4beaa66 3401 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 3402 return -ENOMEM;
3403 return 0;
3404}
3405
2c8c1e72 3406static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 3407{
ece31ffd 3408 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 3409}
3410
3411static struct pernet_operations if6_proc_net_ops = {
3412 .init = if6_proc_net_init,
3413 .exit = if6_proc_net_exit,
3414};
3415
3416int __init if6_proc_init(void)
3417{
3418 return register_pernet_subsys(&if6_proc_net_ops);
3419}
3420
1da177e4
LT		 3421void if6_proc_exit(void)
3422{
3c40090a 3423 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3424}
3425#endif /* CONFIG_PROC_FS */
3426
07a93626 3427#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3428/* Check if address is a home address configured on any interface. */
b71d1d42 3429int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3430{
3431 int ret = 0;
c2e21293 3432 struct inet6_ifaddr *ifp = NULL;
ddbe5032 3433 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3434
5c578aed 3435 rcu_read_lock_bh();
b67bfe0d 3436 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 3437 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3438 continue;
caad295f 3439 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3440 (ifp->flags & IFA_F_HOMEADDRESS)) {
3441 ret = 1;
3442 break;
3443 }
3444 }
5c578aed 3445 rcu_read_unlock_bh();
3b9f9a1c
NT		 3446 return ret;
3447}
3448#endif
3449
1da177e4
LT		 3450/*
3451 * Periodic address status verification
3452 */
3453
3454static void addrconf_verify(unsigned long foo)
3455{
b2db7564 3456 unsigned long now, next, next_sec, next_sched;
1da177e4 3457 struct inet6_ifaddr *ifp;
1da177e4
LT		 3458 int i;
3459
5c578aed 3460 rcu_read_lock_bh();
3461 spin_lock(&addrconf_verify_lock);
1da177e4 3462 now = jiffies;
b2db7564 3463 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4
LT		 3464
3465 del_timer(&addr_chk_timer);
3466
bcdd553f 3467 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3468restart:
b67bfe0d 3469 hlist_for_each_entry_rcu_bh(ifp,
5c578aed 3470 &inet6_addr_lst[i], addr_lst) {
1da177e4 3471 unsigned long age;
1da177e4
LT		 3472
3473 if (ifp->flags & IFA_F_PERMANENT)
3474 continue;
3475
3476 spin_lock(&ifp->lock);
b2db7564
YH		 3477 /* We try to batch several events at once. */
3478 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3479
8f27ebb9
YH		 3480 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3481 age >= ifp->valid_lft) {
1da177e4
LT		 3482 spin_unlock(&ifp->lock);
3483 in6_ifa_hold(ifp);
1da177e4
LT		 3484 ipv6_del_addr(ifp);
3485 goto restart;
8f27ebb9
YH		 3486 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3487 spin_unlock(&ifp->lock);
3488 continue;
1da177e4 3489 } else if (age >= ifp->prefered_lft) {
a1ed0526 3490 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3491 int deprecate = 0;
3492
3493 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3494 deprecate = 1;
3495 ifp->flags |= IFA_F_DEPRECATED;
3496 }
3497
3498 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3499 next = ifp->tstamp + ifp->valid_lft * HZ;
3500
3501 spin_unlock(&ifp->lock);
3502
3503 if (deprecate) {
3504 in6_ifa_hold(ifp);
1da177e4
LT		 3505
3506 ipv6_ifa_notify(0, ifp);
3507 in6_ifa_put(ifp);
3508 goto restart;
3509 }
1da177e4
LT		 3510 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3511 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3512 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3513 ifp->idev->cnf.dad_transmits *
1f9248e5 3514 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 3515
1da177e4
LT		 3516 if (age >= ifp->prefered_lft - regen_advance) {
3517 struct inet6_ifaddr *ifpub = ifp->ifpub;
3518 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3519 next = ifp->tstamp + ifp->prefered_lft * HZ;
3520 if (!ifp->regen_count && ifpub) {
3521 ifp->regen_count++;
3522 in6_ifa_hold(ifp);
3523 in6_ifa_hold(ifpub);
3524 spin_unlock(&ifp->lock);
5c578aed 3525
291d809b
HY		 3526 spin_lock(&ifpub->lock);
3527 ifpub->regen_count = 0;
3528 spin_unlock(&ifpub->lock);
1da177e4
LT		 3529 ipv6_create_tempaddr(ifpub, ifp);
3530 in6_ifa_put(ifpub);
3531 in6_ifa_put(ifp);
3532 goto restart;
3533 }
3534 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3535 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3536 spin_unlock(&ifp->lock);
1da177e4
LT		 3537 } else {
3538 /* ifp->prefered_lft <= ifp->valid_lft */
3539 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3540 next = ifp->tstamp + ifp->prefered_lft * HZ;
3541 spin_unlock(&ifp->lock);
3542 }
3543 }
1da177e4
LT		 3544 }
3545
b2db7564
YH		 3546 next_sec = round_jiffies_up(next);
3547 next_sched = next;
3548
3549 /* If rounded timeout is accurate enough, accept it. */
3550 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3551 next_sched = next_sec;
3552
3553 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3554 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3555 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3556
ba3542e1 3557 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3558 now, next, next_sec, next_sched);
b2db7564
YH		 3559
3560 addr_chk_timer.expires = next_sched;
1da177e4 3561 add_timer(&addr_chk_timer);
5c578aed 3562 spin_unlock(&addrconf_verify_lock);
3563 rcu_read_unlock_bh();
1da177e4
LT		 3564}
3565
caeaba79
ND		 3566static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3567 struct in6_addr **peer_pfx)
461d8837
TG		 3568{
3569 struct in6_addr *pfx = NULL;
3570
caeaba79
ND		 3571 *peer_pfx = NULL;
3572
461d8837
TG		 3573 if (addr)
3574 pfx = nla_data(addr);
3575
3576 if (local) {
3577 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 3578 *peer_pfx = pfx;
3579 pfx = nla_data(local);
461d8837
TG		 3580 }
3581
3582 return pfx;
3583}
3584
ef7c79ed 3585static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3586 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3587 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3588 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 3589 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 3590};
3591
1da177e4 3592static int
661d2967 3593inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3594{
3b1e0a65 3595 struct net *net = sock_net(skb->sk);
b933f716
TG		 3596 struct ifaddrmsg *ifm;
3597 struct nlattr *tb[IFA_MAX+1];
caeaba79 3598 struct in6_addr *pfx, *peer_pfx;
b933f716 3599 int err;
1da177e4 3600
b933f716
TG		 3601 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3602 if (err < 0)
3603 return err;
3604
3605 ifm = nlmsg_data(nlh);
caeaba79 3606 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3607 if (pfx == NULL)
3608 return -EINVAL;
3609
af284937 3610 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3611}
3612
479840ff 3613static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 3614 u32 prefered_lft, u32 valid_lft)
081bba5b 3615{
6f704992
YH		 3616 u32 flags;
3617 clock_t expires;
4bed72e4 3618 unsigned long timeout;
53bd6749 3619 bool was_managetempaddr;
46d48046 3620
081bba5b
NT		 3621 if (!valid_lft || (prefered_lft > valid_lft))
3622 return -EINVAL;
3623
53bd6749
JP		 3624 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
3625 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
3626 return -EINVAL;
3627
4bed72e4
YH		 3628 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3629 if (addrconf_finite_timeout(timeout)) {
3630 expires = jiffies_to_clock_t(timeout * HZ);
3631 valid_lft = timeout;
6f704992 3632 flags = RTF_EXPIRES;
4bed72e4
YH		 3633 } else {
3634 expires = 0;
3635 flags = 0;
3636 ifa_flags |= IFA_F_PERMANENT;
6f704992 3637 }
081bba5b 3638
4bed72e4
YH		 3639 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3640 if (addrconf_finite_timeout(timeout)) {
3641 if (timeout == 0)
3642 ifa_flags |= IFA_F_DEPRECATED;
3643 prefered_lft = timeout;
3644 }
081bba5b
NT		 3645
3646 spin_lock_bh(&ifp->lock);
53bd6749
JP		 3647 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
3648 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
3649 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR);
3650 ifp->flags |= ifa_flags;
081bba5b
NT		 3651 ifp->tstamp = jiffies;
3652 ifp->valid_lft = valid_lft;
3653 ifp->prefered_lft = prefered_lft;
3654
3655 spin_unlock_bh(&ifp->lock);
3656 if (!(ifp->flags&IFA_F_TENTATIVE))
3657 ipv6_ifa_notify(0, ifp);
081bba5b 3658
46d48046 3659 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3660 expires, flags);
53bd6749
JP		 3661
3662 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
3663 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
3664 valid_lft = prefered_lft = 0;
3665 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
3666 !was_managetempaddr, jiffies);
3667 }
3668
081bba5b
NT		 3669 addrconf_verify(0);
3670
3671 return 0;
3672}
3673
1da177e4 3674static int
661d2967 3675inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3676{
3b1e0a65 3677 struct net *net = sock_net(skb->sk);
461d8837
TG		 3678 struct ifaddrmsg *ifm;
3679 struct nlattr *tb[IFA_MAX+1];
caeaba79 3680 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 3681 struct inet6_ifaddr *ifa;
3682 struct net_device *dev;
55ebaef1 3683 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 3684 u32 ifa_flags;
461d8837 3685 int err;
1da177e4 3686
461d8837
TG		 3687 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3688 if (err < 0)
3689 return err;
3690
3691 ifm = nlmsg_data(nlh);
caeaba79 3692 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3693 if (pfx == NULL)
3694 return -EINVAL;
3695
461d8837 3696 if (tb[IFA_CACHEINFO]) {
0778769d 3697 struct ifa_cacheinfo *ci;
461d8837
TG		 3698
3699 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3700 valid_lft = ci->ifa_valid;
461d8837
TG		 3701 preferred_lft = ci->ifa_prefered;
3702 } else {
3703 preferred_lft = INFINITY_LIFE_TIME;
3704 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3705 }
3706
af284937 3707 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3708 if (dev == NULL)
3709 return -ENODEV;
3710
479840ff
JP		 3711 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3712
55ebaef1 3713 /* We ignore other flags so far. */
53bd6749 3714 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR;
55ebaef1 3715
1cab3da6 3716 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3717 if (ifa == NULL) {
3718 /*
3719 * It would be best to check for !NLM_F_CREATE here but
3720 * userspace alreay relies on not having to provide this.
3721 */
caeaba79 3722 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 3723 ifm->ifa_prefixlen, ifa_flags,
3724 preferred_lft, valid_lft);
081bba5b
NT		 3725 }
3726
7198f8ce
TG		 3727 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3728 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3729 err = -EEXIST;
3730 else
55ebaef1 3731 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3732
3733 in6_ifa_put(ifa);
3734
3735 return err;
1da177e4
LT		 3736}
3737
479840ff 3738static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 3739 u8 scope, int ifindex)
3740{
3741 struct ifaddrmsg *ifm;
3742
3743 ifm = nlmsg_data(nlh);
3744 ifm->ifa_family = AF_INET6;
3745 ifm->ifa_prefixlen = prefixlen;
3746 ifm->ifa_flags = flags;
3747 ifm->ifa_scope = scope;
3748 ifm->ifa_index = ifindex;
3749}
3750
85486af0
TG		 3751static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3752 unsigned long tstamp, u32 preferred, u32 valid)
3753{
3754 struct ifa_cacheinfo ci;
3755
18a31e1e
TG		 3756 ci.cstamp = cstamp_delta(cstamp);
3757 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 3758 ci.ifa_prefered = preferred;
3759 ci.ifa_valid = valid;
3760
3761 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3762}
3763
101bb229
TG		 3764static inline int rt_scope(int ifa_scope)
3765{
3766 if (ifa_scope & IFA_HOST)
3767 return RT_SCOPE_HOST;
3768 else if (ifa_scope & IFA_LINK)
3769 return RT_SCOPE_LINK;
3770 else if (ifa_scope & IFA_SITE)
3771 return RT_SCOPE_SITE;
3772 else
3773 return RT_SCOPE_UNIVERSE;
3774}
3775
0ab6803b
TG		 3776static inline int inet6_ifaddr_msgsize(void)
3777{
339bf98f 3778 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 3779 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 3780 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 3781 + nla_total_size(sizeof(struct ifa_cacheinfo))
3782 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 3783}
c5396a31 3784
1da177e4 3785static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 3786 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3787{
1da177e4 3788 struct nlmsghdr *nlh;
85486af0 3789 u32 preferred, valid;
1da177e4 3790
15e47304 3791 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3792 if (nlh == NULL)
26932566 3793 return -EMSGSIZE;
0ab6803b 3794
101bb229
TG		 3795 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3796 ifa->idev->dev->ifindex);
3797
1da177e4 3798 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3799 preferred = ifa->prefered_lft;
3800 valid = ifa->valid_lft;
3801 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3802 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3803 if (preferred > tval)
3804 preferred -= tval;
3805 else
3806 preferred = 0;
f56619fc
BH		 3807 if (valid != INFINITY_LIFE_TIME) {
3808 if (valid > tval)
3809 valid -= tval;
3810 else
3811 valid = 0;
3812 }
1da177e4
LT		 3813 }
3814 } else {
85486af0
TG		 3815 preferred = INFINITY_LIFE_TIME;
3816 valid = INFINITY_LIFE_TIME;
3817 }
3818
7996c799 3819 if (!ipv6_addr_any(&ifa->peer_addr)) {
caeaba79
ND		 3820 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3821 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3822 goto error;
3823 } else
3824 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3825 goto error;
3826
3827 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3828 goto error;
1da177e4 3829
479840ff
JP		 3830 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
3831 goto error;
3832
0ab6803b 3833 return nlmsg_end(skb, nlh);
caeaba79
ND		 3834
3835error:
3836 nlmsg_cancel(skb, nlh);
3837 return -EMSGSIZE;
1da177e4
LT		 3838}
3839
3840static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 3841 u32 portid, u32 seq, int event, u16 flags)
1da177e4 3842{
1da177e4 3843 struct nlmsghdr *nlh;
101bb229
TG		 3844 u8 scope = RT_SCOPE_UNIVERSE;
3845 int ifindex = ifmca->idev->dev->ifindex;
3846
3847 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3848 scope = RT_SCOPE_SITE;
1da177e4 3849
15e47304 3850 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3851 if (nlh == NULL)
26932566 3852 return -EMSGSIZE;
85486af0 3853
0ab6803b
TG		 3854 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3855 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3856 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3857 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3858 nlmsg_cancel(skb, nlh);
3859 return -EMSGSIZE;
3860 }
85486af0 3861
0ab6803b 3862 return nlmsg_end(skb, nlh);
1da177e4
LT		 3863}
3864
3865static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 3866 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3867{
1da177e4 3868 struct nlmsghdr *nlh;
101bb229
TG		 3869 u8 scope = RT_SCOPE_UNIVERSE;
3870 int ifindex = ifaca->aca_idev->dev->ifindex;
3871
3872 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3873 scope = RT_SCOPE_SITE;
1da177e4 3874
15e47304 3875 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3876 if (nlh == NULL)
26932566 3877 return -EMSGSIZE;
85486af0 3878
0ab6803b
TG		 3879 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3880 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3881 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3882 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3883 nlmsg_cancel(skb, nlh);
3884 return -EMSGSIZE;
3885 }
1da177e4 3886
0ab6803b 3887 return nlmsg_end(skb, nlh);
1da177e4
LT		 3888}
3889
e21e8467 3890enum addr_type_t {
1da177e4
LT		 3891 UNICAST_ADDR,
3892 MULTICAST_ADDR,
3893 ANYCAST_ADDR,
3894};
3895
234b27c3
ED		 3896/* called with rcu_read_lock() */
3897static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3898 struct netlink_callback *cb, enum addr_type_t type,
3899 int s_ip_idx, int *p_ip_idx)
3900{
234b27c3
ED		 3901 struct ifmcaddr6 *ifmca;
3902 struct ifacaddr6 *ifaca;
3903 int err = 1;
3904 int ip_idx = *p_ip_idx;
3905
3906 read_lock_bh(&idev->lock);
3907 switch (type) {
502a2ffd 3908 case UNICAST_ADDR: {
3909 struct inet6_ifaddr *ifa;
3910
234b27c3 3911 /* unicast address incl. temp addr */
502a2ffd 3912 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3913 if (++ip_idx < s_ip_idx)
234b27c3
ED		 3914 continue;
3915 err = inet6_fill_ifaddr(skb, ifa,
15e47304 3916 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3917 cb->nlh->nlmsg_seq,
3918 RTM_NEWADDR,
3919 NLM_F_MULTI);
3920 if (err <= 0)
3921 break;
63998ac2 3922 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 3923 }
3924 break;
502a2ffd 3925 }
234b27c3
ED		 3926 case MULTICAST_ADDR:
3927 /* multicast address */
3928 for (ifmca = idev->mc_list; ifmca;
3929 ifmca = ifmca->next, ip_idx++) {
3930 if (ip_idx < s_ip_idx)
3931 continue;
3932 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 3933 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3934 cb->nlh->nlmsg_seq,
3935 RTM_GETMULTICAST,
3936 NLM_F_MULTI);
3937 if (err <= 0)
3938 break;
3939 }
3940 break;
3941 case ANYCAST_ADDR:
3942 /* anycast address */
3943 for (ifaca = idev->ac_list; ifaca;
3944 ifaca = ifaca->aca_next, ip_idx++) {
3945 if (ip_idx < s_ip_idx)
3946 continue;
3947 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 3948 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3949 cb->nlh->nlmsg_seq,
3950 RTM_GETANYCAST,
3951 NLM_F_MULTI);
3952 if (err <= 0)
3953 break;
3954 }
3955 break;
3956 default:
3957 break;
3958 }
3959 read_unlock_bh(&idev->lock);
3960 *p_ip_idx = ip_idx;
3961 return err;
3962}
3963
1da177e4
LT		 3964static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3965 enum addr_type_t type)
3966{
234b27c3
ED		 3967 struct net *net = sock_net(skb->sk);
3968 int h, s_h;
1da177e4
LT		 3969 int idx, ip_idx;
3970 int s_idx, s_ip_idx;
1da177e4 3971 struct net_device *dev;
234b27c3
ED		 3972 struct inet6_dev *idev;
3973 struct hlist_head *head;
1ab1457c 3974
234b27c3
ED		 3975 s_h = cb->args[0];
3976 s_idx = idx = cb->args[1];
3977 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 3978
234b27c3 3979 rcu_read_lock();
63998ac2 3980 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 3981 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3982 idx = 0;
3983 head = &net->dev_index_head[h];
b67bfe0d 3984 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 3985 if (idx < s_idx)
3986 goto cont;
4b97efdf 3987 if (h > s_h || idx > s_idx)
234b27c3
ED		 3988 s_ip_idx = 0;
3989 ip_idx = 0;
e21e8467
SH		 3990 idev = __in6_dev_get(dev);
3991 if (!idev)
234b27c3
ED		 3992 goto cont;
3993
3994 if (in6_dump_addrs(idev, skb, cb, type,
3995 s_ip_idx, &ip_idx) <= 0)
3996 goto done;
7562f876 3997cont:
234b27c3
ED		 3998 idx++;
3999 }
1da177e4 4000 }
234b27c3
ED		 4001done:
4002 rcu_read_unlock();
4003 cb->args[0] = h;
4004 cb->args[1] = idx;
4005 cb->args[2] = ip_idx;
4006
1da177e4
LT		 4007 return skb->len;
4008}
4009
4010static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4011{
4012 enum addr_type_t type = UNICAST_ADDR;
b854272b 4013
1da177e4
LT		 4014 return inet6_dump_addr(skb, cb, type);
4015}
4016
4017static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4018{
4019 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4020
1da177e4
LT		 4021 return inet6_dump_addr(skb, cb, type);
4022}
4023
4024
4025static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4026{
4027 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4028
1da177e4
LT		 4029 return inet6_dump_addr(skb, cb, type);
4030}
4031
661d2967 4032static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4033{
3b1e0a65 4034 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4035 struct ifaddrmsg *ifm;
4036 struct nlattr *tb[IFA_MAX+1];
caeaba79 4037 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4038 struct net_device *dev = NULL;
4039 struct inet6_ifaddr *ifa;
4040 struct sk_buff *skb;
6c223828
NT		 4041 int err;
4042
1b29fc2c
TG		 4043 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4044 if (err < 0)
4045 goto errout;
4046
caeaba79 4047 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
1b29fc2c
TG		 4048 if (addr == NULL) {
4049 err = -EINVAL;
4050 goto errout;
6c223828 4051 }
6c223828 4052
1b29fc2c 4053 ifm = nlmsg_data(nlh);
6c223828 4054 if (ifm->ifa_index)
6fda7350 4055 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4056
e21e8467
SH		 4057 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4058 if (!ifa) {
1b29fc2c
TG		 4059 err = -EADDRNOTAVAIL;
4060 goto errout;
4061 }
6c223828 4062
e21e8467
SH		 4063 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4064 if (!skb) {
6c223828 4065 err = -ENOBUFS;
1b29fc2c 4066 goto errout_ifa;
6c223828
NT		 4067 }
4068
15e47304 4069 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4070 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4071 if (err < 0) {
4072 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4073 WARN_ON(err == -EMSGSIZE);
4074 kfree_skb(skb);
4075 goto errout_ifa;
4076 }
15e47304 4077 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4078errout_ifa:
6c223828 4079 in6_ifa_put(ifa);
1b29fc2c 4080errout:
6c223828 4081 return err;
6c223828
NT		 4082}
4083
1da177e4
LT		 4084static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4085{
4086 struct sk_buff *skb;
c346dca1 4087 struct net *net = dev_net(ifa->idev->dev);
5d620266 4088 int err = -ENOBUFS;
1da177e4 4089
0ab6803b 4090 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 4091 if (skb == NULL)
4092 goto errout;
4093
4094 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4095 if (err < 0) {
4096 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4097 WARN_ON(err == -EMSGSIZE);
4098 kfree_skb(skb);
4099 goto errout;
4100 }
1ce85fe4
PNA		 4101 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4102 return;
5d620266
TG		 4103errout:
4104 if (err < 0)
6fda7350 4105 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4106}
4107
b6f99a21 4108static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4109 __s32 *array, int bytes)
4110{
04561c1f
TG		 4111 BUG_ON(bytes < (DEVCONF_MAX * 4));
4112
1da177e4
LT		 4113 memset(array, 0, bytes);
4114 array[DEVCONF_FORWARDING] = cnf->forwarding;
4115 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4116 array[DEVCONF_MTU6] = cnf->mtu6;
4117 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4118 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4119 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4120 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4121 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4122 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4123 jiffies_to_msecs(cnf->rtr_solicit_interval);
4124 array[DEVCONF_RTR_SOLICIT_DELAY] =
4125 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4126 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4127 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4128 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4129 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4130 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4131 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4132 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4133 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4134 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4135 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4136 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4137 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 4138 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4139#ifdef CONFIG_IPV6_ROUTER_PREF
4140 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4141 array[DEVCONF_RTR_PROBE_INTERVAL] =
4142 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4143#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4144 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4145#endif
930d6ff2 4146#endif
fbea49e1 4147 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4148 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4149#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4150 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4151#endif
7bc570c8
YH		 4152#ifdef CONFIG_IPV6_MROUTE
4153 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4154#endif
778d80be 4155 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4156 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4157 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4158 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 4159 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
1da177e4
LT		 4160}
4161
b382b191
TG		 4162static inline size_t inet6_ifla6_size(void)
4163{
4164 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4165 + nla_total_size(sizeof(struct ifla_cacheinfo))
4166 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4167 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4168 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4169 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4170}
4171
339bf98f
TG		 4172static inline size_t inet6_if_nlmsg_size(void)
4173{
4174 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4175 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4176 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4177 + nla_total_size(4) /* IFLA_MTU */
4178 + nla_total_size(4) /* IFLA_LINK */
b382b191 4179 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4180}
c5396a31 4181
be281e55 4182static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4183 int items, int bytes)
7f7d9a6b
HX		 4184{
4185 int i;
4186 int pad = bytes - sizeof(u64) * items;
4187 BUG_ON(pad < 0);
4188
4189 /* Use put_unaligned() because stats may not be aligned for u64. */
4190 put_unaligned(items, &stats[0]);
4191 for (i = 1; i < items; i++)
be281e55 4192 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4193
4194 memset(&stats[items], 0, pad);
4195}
4196
4ce3c183
ED		 4197static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4198 int items, int bytes, size_t syncpoff)
4199{
4200 int i;
4201 int pad = bytes - sizeof(u64) * items;
4202 BUG_ON(pad < 0);
4203
4204 /* Use put_unaligned() because stats may not be aligned for u64. */
4205 put_unaligned(items, &stats[0]);
4206 for (i = 1; i < items; i++)
4207 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4208
4209 memset(&stats[items], 0, pad);
4210}
4211
7f7d9a6b
HX		 4212static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4213 int bytes)
4214{
e21e8467 4215 switch (attrtype) {
7f7d9a6b 4216 case IFLA_INET6_STATS:
4ce3c183
ED		 4217 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4218 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4219 break;
4220 case IFLA_INET6_ICMP6STATS:
be281e55 4221 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4222 break;
4223 }
4224}
4225
b382b191
TG		 4226static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4227{
4228 struct nlattr *nla;
4229 struct ifla_cacheinfo ci;
4230
c78679e8
DM		 4231 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4232 goto nla_put_failure;
b382b191 4233 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4234 ci.tstamp = cstamp_delta(idev->tstamp);
4235 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 4236 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 4237 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4238 goto nla_put_failure;
b382b191
TG		 4239 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4240 if (nla == NULL)
4241 goto nla_put_failure;
4242 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4243
4244 /* XXX - MC not implemented */
4245
4246 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4247 if (nla == NULL)
4248 goto nla_put_failure;
4249 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4250
4251 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4252 if (nla == NULL)
4253 goto nla_put_failure;
4254 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4255
f53adae4
DB		 4256 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4257 if (nla == NULL)
4258 goto nla_put_failure;
4259 read_lock_bh(&idev->lock);
4260 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4261 read_unlock_bh(&idev->lock);
4262
b382b191
TG		 4263 return 0;
4264
4265nla_put_failure:
4266 return -EMSGSIZE;
4267}
4268
4269static size_t inet6_get_link_af_size(const struct net_device *dev)
4270{
4271 if (!__in6_dev_get(dev))
4272 return 0;
4273
4274 return inet6_ifla6_size();
4275}
4276
4277static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4278{
4279 struct inet6_dev *idev = __in6_dev_get(dev);
4280
4281 if (!idev)
4282 return -ENODATA;
4283
4284 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4285 return -EMSGSIZE;
4286
4287 return 0;
4288}
4289
f53adae4
DB		 4290static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4291{
f53adae4
DB		 4292 struct inet6_ifaddr *ifp;
4293 struct net_device *dev = idev->dev;
fc403832 4294 bool update_rs = false;
dc848292 4295 struct in6_addr ll_addr;
f53adae4
DB		 4296
4297 if (token == NULL)
4298 return -EINVAL;
4299 if (ipv6_addr_any(token))
4300 return -EINVAL;
4301 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4302 return -EINVAL;
f53adae4
DB		 4303 if (!ipv6_accept_ra(idev))
4304 return -EINVAL;
4305 if (idev->cnf.rtr_solicits <= 0)
4306 return -EINVAL;
4307
4308 write_lock_bh(&idev->lock);
4309
4310 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4311 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4312
4313 write_unlock_bh(&idev->lock);
4314
dc848292
HFS		 4315 if (!idev->dead && (idev->if_flags & IF_READY) &&
4316 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4317 IFA_F_OPTIMISTIC)) {
fc403832
DB		 4318
4319 /* If we're not ready, then normal ifup will take care
4320 * of this. Otherwise, we need to request our rs here.
4321 */
4322 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4323 update_rs = true;
4324 }
f53adae4
DB		 4325
4326 write_lock_bh(&idev->lock);
fc403832 4327
77ecaace 4328 if (update_rs) {
fc403832 4329 idev->if_flags |= IF_RS_SENT;
77ecaace
HFS		 4330 idev->rs_probes = 1;
4331 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4332 }
f53adae4
DB		 4333
4334 /* Well, that's kinda nasty ... */
4335 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4336 spin_lock(&ifp->lock);
617fe29d 4337 if (ifp->tokenized) {
f53adae4
DB		 4338 ifp->valid_lft = 0;
4339 ifp->prefered_lft = 0;
4340 }
4341 spin_unlock(&ifp->lock);
4342 }
4343
4344 write_unlock_bh(&idev->lock);
2b9651d7 4345 addrconf_verify(0);
f53adae4
DB		 4346 return 0;
4347}
4348
4349static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4350{
4351 int err = -EINVAL;
4352 struct inet6_dev *idev = __in6_dev_get(dev);
4353 struct nlattr *tb[IFLA_INET6_MAX + 1];
4354
4355 if (!idev)
4356 return -EAFNOSUPPORT;
4357
4358 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4359 BUG();
4360
4361 if (tb[IFLA_INET6_TOKEN])
4362 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4363
4364 return err;
4365}
4366
1ab1457c 4367static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4368 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4369{
04561c1f 4370 struct net_device *dev = idev->dev;
04561c1f
TG		 4371 struct ifinfomsg *hdr;
4372 struct nlmsghdr *nlh;
4373 void *protoinfo;
04561c1f 4374
15e47304 4375 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
04561c1f 4376 if (nlh == NULL)
26932566 4377 return -EMSGSIZE;
04561c1f
TG		 4378
4379 hdr = nlmsg_data(nlh);
4380 hdr->ifi_family = AF_INET6;
4381 hdr->__ifi_pad = 0;
4382 hdr->ifi_type = dev->type;
4383 hdr->ifi_index = dev->ifindex;
4384 hdr->ifi_flags = dev_get_flags(dev);
4385 hdr->ifi_change = 0;
4386
c78679e8
DM		 4387 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4388 (dev->addr_len &&
4389 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4390 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4391 (dev->ifindex != dev->iflink &&
4392 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4393 goto nla_put_failure;
04561c1f
TG		 4394 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4395 if (protoinfo == NULL)
4396 goto nla_put_failure;
1da177e4 4397
b382b191 4398 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4399 goto nla_put_failure;
1da177e4 4400
04561c1f
TG		 4401 nla_nest_end(skb, protoinfo);
4402 return nlmsg_end(skb, nlh);
1da177e4 4403
04561c1f 4404nla_put_failure:
26932566
PM		 4405 nlmsg_cancel(skb, nlh);
4406 return -EMSGSIZE;
1da177e4
LT		 4407}
4408
4409static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4410{
3b1e0a65 4411 struct net *net = sock_net(skb->sk);
84d2697d 4412 int h, s_h;
434a8a58 4413 int idx = 0, s_idx;
1da177e4
LT		 4414 struct net_device *dev;
4415 struct inet6_dev *idev;
84d2697d 4416 struct hlist_head *head;
1da177e4 4417
84d2697d
ED		 4418 s_h = cb->args[0];
4419 s_idx = cb->args[1];
4420
4421 rcu_read_lock();
4422 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4423 idx = 0;
4424 head = &net->dev_index_head[h];
b67bfe0d 4425 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 4426 if (idx < s_idx)
4427 goto cont;
4428 idev = __in6_dev_get(dev);
4429 if (!idev)
4430 goto cont;
4431 if (inet6_fill_ifinfo(skb, idev,
15e47304 4432 NETLINK_CB(cb->skb).portid,
84d2697d
ED		 4433 cb->nlh->nlmsg_seq,
4434 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4435 goto out;
7562f876 4436cont:
84d2697d
ED		 4437 idx++;
4438 }
1da177e4 4439 }
84d2697d
ED		 4440out:
4441 rcu_read_unlock();
4442 cb->args[1] = idx;
4443 cb->args[0] = h;
1da177e4
LT		 4444
4445 return skb->len;
4446}
4447
4448void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4449{
4450 struct sk_buff *skb;
c346dca1 4451 struct net *net = dev_net(idev->dev);
8d7a76c9 4452 int err = -ENOBUFS;
1ab1457c 4453
339bf98f 4454 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4455 if (skb == NULL)
4456 goto errout;
4457
4458 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4459 if (err < 0) {
4460 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4461 WARN_ON(err == -EMSGSIZE);
4462 kfree_skb(skb);
4463 goto errout;
4464 }
5f75a104 4465 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4466 return;
8d7a76c9
TG		 4467errout:
4468 if (err < 0)
5f75a104 4469 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4470}
4471
339bf98f
TG		 4472static inline size_t inet6_prefix_nlmsg_size(void)
4473{
4474 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4475 + nla_total_size(sizeof(struct in6_addr))
4476 + nla_total_size(sizeof(struct prefix_cacheinfo));
4477}
c5396a31 4478
1da177e4 4479static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4480 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 4481 int event, unsigned int flags)
1da177e4 4482{
6051e2f4
TG		 4483 struct prefixmsg *pmsg;
4484 struct nlmsghdr *nlh;
1da177e4
LT		 4485 struct prefix_cacheinfo ci;
4486
15e47304 4487 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6051e2f4 4488 if (nlh == NULL)
26932566 4489 return -EMSGSIZE;
6051e2f4
TG		 4490
4491 pmsg = nlmsg_data(nlh);
1da177e4 4492 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4493 pmsg->prefix_pad1 = 0;
4494 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4495 pmsg->prefix_ifindex = idev->dev->ifindex;
4496 pmsg->prefix_len = pinfo->prefix_len;
4497 pmsg->prefix_type = pinfo->type;
8a47077a 4498 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4499 pmsg->prefix_flags = 0;
4500 if (pinfo->onlink)
4501 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4502 if (pinfo->autoconf)
4503 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4504
c78679e8
DM		 4505 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4506 goto nla_put_failure;
1da177e4
LT		 4507 ci.preferred_time = ntohl(pinfo->prefered);
4508 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 4509 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4510 goto nla_put_failure;
6051e2f4 4511 return nlmsg_end(skb, nlh);
1da177e4 4512
6051e2f4 4513nla_put_failure:
26932566
PM		 4514 nlmsg_cancel(skb, nlh);
4515 return -EMSGSIZE;
1da177e4
LT		 4516}
4517
1ab1457c 4518static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4519 struct prefix_info *pinfo)
4520{
4521 struct sk_buff *skb;
c346dca1 4522 struct net *net = dev_net(idev->dev);
8c384bfa 4523 int err = -ENOBUFS;
1da177e4 4524
339bf98f 4525 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4526 if (skb == NULL)
4527 goto errout;
4528
4529 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4530 if (err < 0) {
4531 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4532 WARN_ON(err == -EMSGSIZE);
4533 kfree_skb(skb);
4534 goto errout;
4535 }
1ce85fe4
PNA		 4536 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4537 return;
8c384bfa
TG		 4538errout:
4539 if (err < 0)
6fda7350 4540 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4541}
4542
1ec047eb
HFS		 4543static void update_valid_ll_addr_cnt(struct inet6_ifaddr *ifp, int count)
4544{
4545 write_lock_bh(&ifp->idev->lock);
4546 spin_lock(&ifp->lock);
4547 if (((ifp->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|
4548 IFA_F_DADFAILED)) == IFA_F_PERMANENT) &&
4549 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL))
4550 ifp->idev->valid_ll_addr_cnt += count;
4551 WARN_ON(ifp->idev->valid_ll_addr_cnt < 0);
4552 spin_unlock(&ifp->lock);
4553 write_unlock_bh(&ifp->idev->lock);
4554}
4555
1da177e4
LT		 4556static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4557{
63998ac2
ND		 4558 struct net *net = dev_net(ifp->idev->dev);
4559
1da177e4
LT		 4560 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4561
4562 switch (event) {
4563 case RTM_NEWADDR:
1ec047eb
HFS		 4564 update_valid_ll_addr_cnt(ifp, 1);
4565
95c385b4
NH		 4566 /*
4567 * If the address was optimistic
4568 * we inserted the route at the start of
4569 * our DAD process, so we don't need
4570 * to do it again
4571 */
4572 if (!(ifp->rt->rt6i_node))
4573 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4574 if (ifp->idev->cnf.forwarding)
4575 addrconf_join_anycast(ifp);
7996c799 4576 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 4577 addrconf_prefix_route(&ifp->peer_addr, 128,
4578 ifp->idev->dev, 0, 0);
1da177e4
LT		 4579 break;
4580 case RTM_DELADDR:
1ec047eb
HFS		 4581 update_valid_ll_addr_cnt(ifp, -1);
4582
1da177e4
LT		 4583 if (ifp->idev->cnf.forwarding)
4584 addrconf_leave_anycast(ifp);
4585 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 4586 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79
ND		 4587 struct rt6_info *rt;
4588 struct net_device *dev = ifp->idev->dev;
4589
4590 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4591 dev->ifindex, 1);
4592 if (rt) {
4593 dst_hold(&rt->dst);
4594 if (ip6_del_rt(rt))
4595 dst_free(&rt->dst);
4596 }
4597 }
d8d1f30b 4598 dst_hold(&ifp->rt->dst);
93fa159a 4599
73a8bd74 4600 if (ip6_del_rt(ifp->rt))
d8d1f30b 4601 dst_free(&ifp->rt->dst);
1da177e4
LT		 4602 break;
4603 }
63998ac2 4604 atomic_inc(&net->ipv6.dev_addr_genid);
439677d7 4605 rt_genid_bump_ipv6(net);
1da177e4
LT		 4606}
4607
4608static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4609{
8814c4b5 4610 rcu_read_lock_bh();
1da177e4
LT		 4611 if (likely(ifp->idev->dead == 0))
4612 __ipv6_ifa_notify(event, ifp);
8814c4b5 4613 rcu_read_unlock_bh();
1da177e4
LT		 4614}
4615
4616#ifdef CONFIG_SYSCTL
4617
4618static
fe2c6338 4619int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 4620 void __user *buffer, size_t *lenp, loff_t *ppos)
4621{
4622 int *valp = ctl->data;
4623 int val = *valp;
88af182e 4624 loff_t pos = *ppos;
fe2c6338 4625 struct ctl_table lctl;
1da177e4
LT		 4626 int ret;
4627
013d97e9
FR		 4628 /*
4629 * ctl->data points to idev->cnf.forwarding, we should
4630 * not modify it until we get the rtnl lock.
4631 */
4632 lctl = *ctl;
4633 lctl.data = &val;
4634
4635 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 4636
c8fecf22 4637 if (write)
b325fddb 4638 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4639 if (ret)
4640 *ppos = pos;
1ab1457c 4641 return ret;
1da177e4
LT		 4642}
4643
56d417b1
BH		 4644static void dev_disable_change(struct inet6_dev *idev)
4645{
75538c2b
CW		 4646 struct netdev_notifier_info info;
4647
56d417b1
BH		 4648 if (!idev || !idev->dev)
4649 return;
4650
75538c2b 4651 netdev_notifier_info_init(&info, idev->dev);
56d417b1 4652 if (idev->cnf.disable_ipv6)
75538c2b 4653 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 4654 else
75538c2b 4655 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 4656}
4657
4658static void addrconf_disable_change(struct net *net, __s32 newf)
4659{
4660 struct net_device *dev;
4661 struct inet6_dev *idev;
4662
c6d14c84
ED		 4663 rcu_read_lock();
4664 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4665 idev = __in6_dev_get(dev);
4666 if (idev) {
4667 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4668 idev->cnf.disable_ipv6 = newf;
4669 if (changed)
4670 dev_disable_change(idev);
4671 }
56d417b1 4672 }
c6d14c84 4673 rcu_read_unlock();
56d417b1
BH		 4674}
4675
013d97e9 4676static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 4677{
4678 struct net *net;
013d97e9
FR		 4679 int old;
4680
4681 if (!rtnl_trylock())
4682 return restart_syscall();
56d417b1
BH		 4683
4684 net = (struct net *)table->extra2;
013d97e9
FR		 4685 old = *p;
4686 *p = newf;
56d417b1 4687
013d97e9
FR		 4688 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4689 rtnl_unlock();
56d417b1 4690 return 0;
88af182e 4691 }
56d417b1
BH		 4692
4693 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 4694 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4695 addrconf_disable_change(net, newf);
013d97e9 4696 } else if ((!newf) ^ (!old))
56d417b1
BH		 4697 dev_disable_change((struct inet6_dev *)table->extra1);
4698
4699 rtnl_unlock();
4700 return 0;
4701}
4702
4703static
fe2c6338 4704int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 4705 void __user *buffer, size_t *lenp, loff_t *ppos)
4706{
4707 int *valp = ctl->data;
4708 int val = *valp;
88af182e 4709 loff_t pos = *ppos;
fe2c6338 4710 struct ctl_table lctl;
56d417b1
BH		 4711 int ret;
4712
013d97e9
FR		 4713 /*
4714 * ctl->data points to idev->cnf.disable_ipv6, we should
4715 * not modify it until we get the rtnl lock.
4716 */
4717 lctl = *ctl;
4718 lctl.data = &val;
4719
4720 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 4721
4722 if (write)
4723 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4724 if (ret)
4725 *ppos = pos;
56d417b1
BH		 4726 return ret;
4727}
4728
1da177e4
LT		 4729static struct addrconf_sysctl_table
4730{
4731 struct ctl_table_header *sysctl_header;
fe2c6338 4732 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 4733} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4734 .sysctl_header = NULL,
4735 .addrconf_vars = {
1ab1457c 4736 {
e21e8467
SH		 4737 .procname = "forwarding",
4738 .data = &ipv6_devconf.forwarding,
4739 .maxlen = sizeof(int),
4740 .mode = 0644,
4741 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4742 },
4743 {
e21e8467
SH		 4744 .procname = "hop_limit",
4745 .data = &ipv6_devconf.hop_limit,
4746 .maxlen = sizeof(int),
4747 .mode = 0644,
4748 .proc_handler = proc_dointvec,
1da177e4
LT		 4749 },
4750 {
e21e8467
SH		 4751 .procname = "mtu",
4752 .data = &ipv6_devconf.mtu6,
4753 .maxlen = sizeof(int),
4754 .mode = 0644,
4755 .proc_handler = proc_dointvec,
1da177e4
LT		 4756 },
4757 {
e21e8467
SH		 4758 .procname = "accept_ra",
4759 .data = &ipv6_devconf.accept_ra,
4760 .maxlen = sizeof(int),
4761 .mode = 0644,
4762 .proc_handler = proc_dointvec,
1da177e4
LT		 4763 },
4764 {
e21e8467
SH		 4765 .procname = "accept_redirects",
4766 .data = &ipv6_devconf.accept_redirects,
4767 .maxlen = sizeof(int),
4768 .mode = 0644,
4769 .proc_handler = proc_dointvec,
1da177e4
LT		 4770 },
4771 {
e21e8467
SH		 4772 .procname = "autoconf",
4773 .data = &ipv6_devconf.autoconf,
4774 .maxlen = sizeof(int),
4775 .mode = 0644,
4776 .proc_handler = proc_dointvec,
1da177e4
LT		 4777 },
4778 {
e21e8467
SH		 4779 .procname = "dad_transmits",
4780 .data = &ipv6_devconf.dad_transmits,
4781 .maxlen = sizeof(int),
4782 .mode = 0644,
4783 .proc_handler = proc_dointvec,
1da177e4
LT		 4784 },
4785 {
e21e8467
SH		 4786 .procname = "router_solicitations",
4787 .data = &ipv6_devconf.rtr_solicits,
4788 .maxlen = sizeof(int),
4789 .mode = 0644,
4790 .proc_handler = proc_dointvec,
1da177e4
LT		 4791 },
4792 {
e21e8467
SH		 4793 .procname = "router_solicitation_interval",
4794 .data = &ipv6_devconf.rtr_solicit_interval,
4795 .maxlen = sizeof(int),
4796 .mode = 0644,
4797 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4798 },
4799 {
e21e8467
SH		 4800 .procname = "router_solicitation_delay",
4801 .data = &ipv6_devconf.rtr_solicit_delay,
4802 .maxlen = sizeof(int),
4803 .mode = 0644,
4804 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4805 },
4806 {
e21e8467
SH		 4807 .procname = "force_mld_version",
4808 .data = &ipv6_devconf.force_mld_version,
4809 .maxlen = sizeof(int),
4810 .mode = 0644,
4811 .proc_handler = proc_dointvec,
1da177e4 4812 },
fc4eba58
HFS		 4813 {
4814 .procname = "mldv1_unsolicited_report_interval",
4815 .data =
4816 &ipv6_devconf.mldv1_unsolicited_report_interval,
4817 .maxlen = sizeof(int),
4818 .mode = 0644,
4819 .proc_handler = proc_dointvec_ms_jiffies,
4820 },
4821 {
4822 .procname = "mldv2_unsolicited_report_interval",
4823 .data =
4824 &ipv6_devconf.mldv2_unsolicited_report_interval,
4825 .maxlen = sizeof(int),
4826 .mode = 0644,
4827 .proc_handler = proc_dointvec_ms_jiffies,
4828 },
1da177e4 4829 {
e21e8467
SH		 4830 .procname = "use_tempaddr",
4831 .data = &ipv6_devconf.use_tempaddr,
4832 .maxlen = sizeof(int),
4833 .mode = 0644,
4834 .proc_handler = proc_dointvec,
1da177e4
LT		 4835 },
4836 {
e21e8467
SH		 4837 .procname = "temp_valid_lft",
4838 .data = &ipv6_devconf.temp_valid_lft,
4839 .maxlen = sizeof(int),
4840 .mode = 0644,
4841 .proc_handler = proc_dointvec,
1da177e4
LT		 4842 },
4843 {
e21e8467
SH		 4844 .procname = "temp_prefered_lft",
4845 .data = &ipv6_devconf.temp_prefered_lft,
4846 .maxlen = sizeof(int),
4847 .mode = 0644,
4848 .proc_handler = proc_dointvec,
1da177e4
LT		 4849 },
4850 {
e21e8467
SH		 4851 .procname = "regen_max_retry",
4852 .data = &ipv6_devconf.regen_max_retry,
4853 .maxlen = sizeof(int),
4854 .mode = 0644,
4855 .proc_handler = proc_dointvec,
1da177e4
LT		 4856 },
4857 {
e21e8467
SH		 4858 .procname = "max_desync_factor",
4859 .data = &ipv6_devconf.max_desync_factor,
4860 .maxlen = sizeof(int),
4861 .mode = 0644,
4862 .proc_handler = proc_dointvec,
1da177e4 4863 },
1da177e4 4864 {
e21e8467
SH		 4865 .procname = "max_addresses",
4866 .data = &ipv6_devconf.max_addresses,
4867 .maxlen = sizeof(int),
4868 .mode = 0644,
4869 .proc_handler = proc_dointvec,
1da177e4 4870 },
65f5c7c1 4871 {
e21e8467
SH		 4872 .procname = "accept_ra_defrtr",
4873 .data = &ipv6_devconf.accept_ra_defrtr,
4874 .maxlen = sizeof(int),
4875 .mode = 0644,
4876 .proc_handler = proc_dointvec,
65f5c7c1 4877 },
c4fd30eb 4878 {
e21e8467
SH		 4879 .procname = "accept_ra_pinfo",
4880 .data = &ipv6_devconf.accept_ra_pinfo,
4881 .maxlen = sizeof(int),
4882 .mode = 0644,
4883 .proc_handler = proc_dointvec,
c4fd30eb 4884 },
930d6ff2
YH		 4885#ifdef CONFIG_IPV6_ROUTER_PREF
4886 {
e21e8467
SH		 4887 .procname = "accept_ra_rtr_pref",
4888 .data = &ipv6_devconf.accept_ra_rtr_pref,
4889 .maxlen = sizeof(int),
4890 .mode = 0644,
4891 .proc_handler = proc_dointvec,
930d6ff2 4892 },
52e16356 4893 {
e21e8467
SH		 4894 .procname = "router_probe_interval",
4895 .data = &ipv6_devconf.rtr_probe_interval,
4896 .maxlen = sizeof(int),
4897 .mode = 0644,
4898 .proc_handler = proc_dointvec_jiffies,
52e16356 4899 },
fa03ef38 4900#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4901 {
e21e8467
SH		 4902 .procname = "accept_ra_rt_info_max_plen",
4903 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4904 .maxlen = sizeof(int),
4905 .mode = 0644,
4906 .proc_handler = proc_dointvec,
09c884d4
YH		 4907 },
4908#endif
930d6ff2 4909#endif
fbea49e1 4910 {
e21e8467
SH		 4911 .procname = "proxy_ndp",
4912 .data = &ipv6_devconf.proxy_ndp,
4913 .maxlen = sizeof(int),
4914 .mode = 0644,
4915 .proc_handler = proc_dointvec,
fbea49e1 4916 },
0bcbc926 4917 {
e21e8467
SH		 4918 .procname = "accept_source_route",
4919 .data = &ipv6_devconf.accept_source_route,
4920 .maxlen = sizeof(int),
4921 .mode = 0644,
4922 .proc_handler = proc_dointvec,
0bcbc926 4923 },
95c385b4
NH		 4924#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4925 {
e21e8467
SH		 4926 .procname = "optimistic_dad",
4927 .data = &ipv6_devconf.optimistic_dad,
4928 .maxlen = sizeof(int),
4929 .mode = 0644,
4930 .proc_handler = proc_dointvec,
95c385b4
NH		 4931
4932 },
7bc570c8
YH		 4933#endif
4934#ifdef CONFIG_IPV6_MROUTE
4935 {
e21e8467
SH		 4936 .procname = "mc_forwarding",
4937 .data = &ipv6_devconf.mc_forwarding,
4938 .maxlen = sizeof(int),
4939 .mode = 0444,
4940 .proc_handler = proc_dointvec,
7bc570c8 4941 },
95c385b4 4942#endif
778d80be 4943 {
e21e8467
SH		 4944 .procname = "disable_ipv6",
4945 .data = &ipv6_devconf.disable_ipv6,
4946 .maxlen = sizeof(int),
4947 .mode = 0644,
4948 .proc_handler = addrconf_sysctl_disable,
778d80be 4949 },
1b34be74 4950 {
e21e8467
SH		 4951 .procname = "accept_dad",
4952 .data = &ipv6_devconf.accept_dad,
4953 .maxlen = sizeof(int),
4954 .mode = 0644,
4955 .proc_handler = proc_dointvec,
1b34be74 4956 },
f7734fdf 4957 {
f7734fdf
OP		 4958 .procname = "force_tllao",
4959 .data = &ipv6_devconf.force_tllao,
4960 .maxlen = sizeof(int),
4961 .mode = 0644,
4962 .proc_handler = proc_dointvec
4963 },
5cb04436
HFS		 4964 {
4965 .procname = "ndisc_notify",
4966 .data = &ipv6_devconf.ndisc_notify,
4967 .maxlen = sizeof(int),
4968 .mode = 0644,
4969 .proc_handler = proc_dointvec
4970 },
b800c3b9
HFS		 4971 {
4972 .procname = "suppress_frag_ndisc",
4973 .data = &ipv6_devconf.suppress_frag_ndisc,
4974 .maxlen = sizeof(int),
4975 .mode = 0644,
4976 .proc_handler = proc_dointvec
4977 },
1da177e4 4978 {
f8572d8f 4979 /* sentinel */
1da177e4
LT		 4980 }
4981 },
1da177e4
LT		 4982};
4983
bff16c2f 4984static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4985 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4986{
4987 int i;
1da177e4 4988 struct addrconf_sysctl_table *t;
6105e293 4989 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 4990
af879cc7 4991 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4992 if (t == NULL)
f68635e6
PE		 4993 goto out;
4994
bcdd553f 4995 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 4996 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 4997 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4998 t->addrconf_vars[i].extra2 = net;
1da177e4 4999 }
1da177e4 5000
6105e293 5001 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 5002
6105e293 5003 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
1da177e4 5004 if (t->sysctl_header == NULL)
6105e293 5005 goto free;
f68635e6
PE		 5006
5007 p->sysctl = t;
95897312 5008 return 0;
1da177e4 5009
f68635e6 5010free:
1da177e4 5011 kfree(t);
f68635e6 5012out:
95897312 5013 return -ENOBUFS;
1da177e4
LT		 5014}
5015
408c4768
PE		 5016static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5017{
5018 struct addrconf_sysctl_table *t;
5019
5020 if (p->sysctl == NULL)
5021 return;
5022
5023 t = p->sysctl;
5024 p->sysctl = NULL;
ff538818 5025 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 5026 kfree(t);
5027}
5028
f52295a9
PE		 5029static void addrconf_sysctl_register(struct inet6_dev *idev)
5030{
54716e3b 5031 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 5032 &ndisc_ifinfo_sysctl_change);
c346dca1 5033 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 5034 idev, &idev->cnf);
f52295a9
PE		 5035}
5036
408c4768 5037static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 5038{
408c4768
PE		 5039 __addrconf_sysctl_unregister(&idev->cnf);
5040 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 5041}
5042
5043
5044#endif
5045
2c8c1e72 5046static int __net_init addrconf_init_net(struct net *net)
e0da5a48 5047{
a79ca223 5048 int err = -ENOMEM;
e0da5a48
PE		 5049 struct ipv6_devconf *all, *dflt;
5050
a79ca223
HZ		 5051 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5052 if (all == NULL)
5053 goto err_alloc_all;
e0da5a48 5054
a79ca223
HZ		 5055 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5056 if (dflt == NULL)
5057 goto err_alloc_dflt;
e0da5a48 5058
a79ca223
HZ		 5059 /* these will be inherited by all namespaces */
5060 dflt->autoconf = ipv6_defaults.autoconf;
5061 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 5062
5063 net->ipv6.devconf_all = all;
5064 net->ipv6.devconf_dflt = dflt;
5065
5066#ifdef CONFIG_SYSCTL
f8572d8f 5067 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 5068 if (err < 0)
5069 goto err_reg_all;
5070
f8572d8f 5071 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 5072 if (err < 0)
5073 goto err_reg_dflt;
5074#endif
5075 return 0;
5076
5077#ifdef CONFIG_SYSCTL
5078err_reg_dflt:
5079 __addrconf_sysctl_unregister(all);
5080err_reg_all:
5081 kfree(dflt);
5082#endif
5083err_alloc_dflt:
5084 kfree(all);
5085err_alloc_all:
5086 return err;
5087}
5088
2c8c1e72 5089static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 5090{
5091#ifdef CONFIG_SYSCTL
5092 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5093 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5094#endif
09ad9bc7 5095 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 5096 kfree(net->ipv6.devconf_dflt);
5097 kfree(net->ipv6.devconf_all);
5098 }
5099}
5100
5101static struct pernet_operations addrconf_ops = {
5102 .init = addrconf_init_net,
5103 .exit = addrconf_exit_net,
5104};
5105
b382b191
TG		 5106static struct rtnl_af_ops inet6_ops = {
5107 .family = AF_INET6,
5108 .fill_link_af = inet6_fill_link_af,
5109 .get_link_af_size = inet6_get_link_af_size,
f53adae4 5110 .set_link_af = inet6_set_link_af,
b382b191
TG		 5111};
5112
1da177e4
LT		 5113/*
5114 * Init / cleanup code
5115 */
5116
5117int __init addrconf_init(void)
5118{
c2e21293 5119 int i, err;
2a8cc6c8 5120
e21e8467
SH		 5121 err = ipv6_addr_label_init();
5122 if (err < 0) {
f3213831
JP		 5123 pr_crit("%s: cannot initialize default policy table: %d\n",
5124 __func__, err);
2cc6d2bf 5125 goto out;
2a8cc6c8 5126 }
1da177e4 5127
2cc6d2bf
NH		 5128 err = register_pernet_subsys(&addrconf_ops);
5129 if (err < 0)
5130 goto out_addrlabel;
e0da5a48 5131
1da177e4
LT		 5132 /* The addrconf netdev notifier requires that loopback_dev
5133 * has it's ipv6 private information allocated and setup
5134 * before it can bring up and give link-local addresses
5135 * to other devices which are up.
5136 *
5137 * Unfortunately, loopback_dev is not necessarily the first
5138 * entry in the global dev_base list of net devices. In fact,
5139 * it is likely to be the very last entry on that list.
5140 * So this causes the notifier registry below to try and
5141 * give link-local addresses to all devices besides loopback_dev
5142 * first, then loopback_dev, which cases all the non-loopback_dev
5143 * devices to fail to get a link-local address.
5144 *
5145 * So, as a temporary fix, allocate the ipv6 structure for
5146 * loopback_dev first by hand.
5147 * Longer term, all of the dependencies ipv6 has upon the loopback
5148 * device and it being up should be removed.
5149 */
5150 rtnl_lock();
2774c7ab 5151 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 5152 err = -ENOMEM;
5153 rtnl_unlock();
5154 if (err)
e0da5a48 5155 goto errlo;
1da177e4 5156
c2e21293 5157 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5158 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5159
1da177e4
LT		 5160 register_netdevice_notifier(&ipv6_dev_notf);
5161
1da177e4 5162 addrconf_verify(0);
c127ea2c 5163
b382b191
TG		 5164 err = rtnl_af_register(&inet6_ops);
5165 if (err < 0)
5166 goto errout_af;
5167
c7ac8679
GR		 5168 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5169 NULL);
c127ea2c
TG		 5170 if (err < 0)
5171 goto errout;
5172
5173 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 5174 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5175 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5176 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5177 inet6_dump_ifaddr, NULL);
5178 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5179 inet6_dump_ifmcaddr, NULL);
5180 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5181 inet6_dump_ifacaddr, NULL);
76f8f6cb 5182 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 5183 inet6_netconf_dump_devconf, NULL);
c127ea2c 5184
2a8cc6c8
YH		 5185 ipv6_addr_label_rtnl_register();
5186
1da177e4 5187 return 0;
c127ea2c 5188errout:
b382b191
TG		 5189 rtnl_af_unregister(&inet6_ops);
5190errout_af:
c127ea2c 5191 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 5192errlo:
5193 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 5194out_addrlabel:
5195 ipv6_addr_label_cleanup();
5196out:
c127ea2c 5197 return err;
1da177e4
LT		 5198}
5199
09f7709f 5200void addrconf_cleanup(void)
1da177e4 5201{
176c39af 5202 struct net_device *dev;
1da177e4
LT		 5203 int i;
5204
5205 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5206 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 5207 ipv6_addr_label_cleanup();
1da177e4
LT		 5208
5209 rtnl_lock();
5210
b382b191
TG		 5211 __rtnl_af_unregister(&inet6_ops);
5212
176c39af
DL		 5213 /* clean dev list */
5214 for_each_netdev(&init_net, dev) {
5215 if (__in6_dev_get(dev) == NULL)
5216 continue;
5217 addrconf_ifdown(dev, 1);
5218 }
5219 addrconf_ifdown(init_net.loopback_dev, 2);
5220
1da177e4
LT		 5221 /*
5222 * Check hash table.
5223 */
5c578aed 5224 spin_lock_bh(&addrconf_hash_lock);
c2e21293 5225 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5226 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 5227 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 5228
5229 del_timer(&addr_chk_timer);
1da177e4 5230 rtnl_unlock();
1da177e4 5231}
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