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net: if_arp: add ARPHRD_6LOWPAN type
[linux-block.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
1da177e4
LT		 46#include <linux/socket.h>
47#include <linux/sockios.h>
1da177e4
LT		 48#include <linux/net.h>
49#include <linux/in6.h>
50#include <linux/netdevice.h>
1823730f 51#include <linux/if_addr.h>
1da177e4
LT		 52#include <linux/if_arp.h>
53#include <linux/if_arcnet.h>
54#include <linux/if_infiniband.h>
55#include <linux/route.h>
56#include <linux/inetdevice.h>
57#include <linux/init.h>
5a0e3ad6 58#include <linux/slab.h>
1da177e4
LT		 59#ifdef CONFIG_SYSCTL
60#include <linux/sysctl.h>
61#endif
4fc268d2 62#include <linux/capability.h>
1da177e4
LT		 63#include <linux/delay.h>
64#include <linux/notifier.h>
543537bd 65#include <linux/string.h>
ddbe5032 66#include <linux/hash.h>
1da177e4 67
457c4cbc 68#include <net/net_namespace.h>
1da177e4
LT		 69#include <net/sock.h>
70#include <net/snmp.h>
71
06a4c1c5 72#include <net/af_ieee802154.h>
cb6bf355 73#include <net/firewire.h>
1da177e4
LT		 74#include <net/ipv6.h>
75#include <net/protocol.h>
76#include <net/ndisc.h>
77#include <net/ip6_route.h>
78#include <net/addrconf.h>
79#include <net/tcp.h>
80#include <net/ip.h>
5d620266 81#include <net/netlink.h>
f24e3d65 82#include <net/pkt_sched.h>
1da177e4
LT		 83#include <linux/if_tunnel.h>
84#include <linux/rtnetlink.h>
f3a1bfb1 85#include <linux/netconf.h>
1da177e4 86#include <linux/random.h>
e21e8467 87#include <linux/uaccess.h>
7f7d9a6b 88#include <asm/unaligned.h>
1da177e4
LT		 89
90#include <linux/proc_fs.h>
91#include <linux/seq_file.h>
bc3b2d7f 92#include <linux/export.h>
1da177e4
LT		 93
94/* Set to 3 to get tracing... */
95#define ACONF_DEBUG 2
96
97#if ACONF_DEBUG >= 3
ba3542e1 98#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
1da177e4 99#else
ba3542e1 100#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
1da177e4
LT		 101#endif
102
103#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e
TG		 104
105static inline u32 cstamp_delta(unsigned long cstamp)
106{
107 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
108}
1da177e4
LT		 109
110#ifdef CONFIG_SYSCTL
f52295a9 111static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 112static void addrconf_sysctl_unregister(struct inet6_dev *idev);
113#else
114static inline void addrconf_sysctl_register(struct inet6_dev *idev)
115{
116}
117
118static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
119{
120}
1da177e4
LT		 121#endif
122
eb7e0575
SD		 123static void __ipv6_regen_rndid(struct inet6_dev *idev);
124static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 125static void ipv6_regen_rndid(unsigned long data);
1da177e4 126
1b34be74 127static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 128static int ipv6_count_addresses(struct inet6_dev *idev);
129
130/*
131 * Configured unicast address hash table
132 */
c2e21293 133static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 134static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 135
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
LT		 1026
1027 write_lock(&idev->lock);
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) {
1039 write_unlock(&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);
1049 write_unlock(&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
DM		 1073 idev->cnf.dad_transmits *
1074 idev->nd_parms->retrans_time / HZ;
1da177e4 1075 write_unlock(&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
LT		 1101 tmpaddr = &addr;
1102 write_lock(&idev->lock);
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
AW		 1409int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1410 unsigned char 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
NH		 1426int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1427 unsigned char 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 -
784e2710
BH		 1891 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1892 idev->cnf.max_desync_factor * HZ;
1da177e4 1893 if (time_before(expires, jiffies)) {
f3213831
JP		 1894 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1895 __func__, idev->dev->name);
1da177e4
LT		 1896 goto out;
1897 }
1898
1899 if (!mod_timer(&idev->regen_timer, expires))
1900 in6_dev_hold(idev);
1901
1902out:
1903 write_unlock_bh(&idev->lock);
8814c4b5 1904 rcu_read_unlock_bh();
1da177e4
LT		 1905 in6_dev_put(idev);
1906}
1907
eb7e0575 1908static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 1909{
1da177e4 1910 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 1911 __ipv6_regen_rndid(idev);
1da177e4 1912}
1da177e4
LT		 1913
1914/*
1915 * Add prefix route.
1916 */
1917
1918static void
1919addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1920 unsigned long expires, u32 flags)
1da177e4 1921{
86872cb5
TG		 1922 struct fib6_config cfg = {
1923 .fc_table = RT6_TABLE_PREFIX,
1924 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1925 .fc_ifindex = dev->ifindex,
1926 .fc_expires = expires,
1927 .fc_dst_len = plen,
1928 .fc_flags = RTF_UP | flags,
c346dca1 1929 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1930 .fc_protocol = RTPROT_KERNEL,
86872cb5 1931 };
1da177e4 1932
4e3fd7a0 1933 cfg.fc_dst = *pfx;
1da177e4
LT		 1934
1935 /* Prevent useless cloning on PtP SIT.
1936 This thing is done here expecting that the whole
1937 class of non-broadcast devices need not cloning.
1938 */
07a93626 1939#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 1940 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1941 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1942#endif
1da177e4 1943
86872cb5 1944 ip6_route_add(&cfg);
1da177e4
LT		 1945}
1946
14ef37b6
AH		 1947
1948static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1949 int plen,
1950 const struct net_device *dev,
1951 u32 flags, u32 noflags)
1952{
1953 struct fib6_node *fn;
1954 struct rt6_info *rt = NULL;
1955 struct fib6_table *table;
1956
1957 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1958 if (table == NULL)
1959 return NULL;
1960
5744dd9b 1961 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 1962 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1963 if (!fn)
1964 goto out;
1965 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 1966 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 1967 continue;
1968 if ((rt->rt6i_flags & flags) != flags)
1969 continue;
85da53bf 1970 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 1971 continue;
1972 dst_hold(&rt->dst);
1973 break;
1974 }
1975out:
5744dd9b 1976 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 1977 return rt;
1978}
1979
1980
1da177e4
LT		 1981/* Create "default" multicast route to the interface */
1982
1983static void addrconf_add_mroute(struct net_device *dev)
1984{
86872cb5
TG		 1985 struct fib6_config cfg = {
1986 .fc_table = RT6_TABLE_LOCAL,
1987 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1988 .fc_ifindex = dev->ifindex,
1989 .fc_dst_len = 8,
1990 .fc_flags = RTF_UP,
c346dca1 1991 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1992 };
1993
1994 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1995
1996 ip6_route_add(&cfg);
1da177e4
LT		 1997}
1998
1da177e4
LT		 1999static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2000{
2001 struct inet6_dev *idev;
2002
2003 ASSERT_RTNL();
2004
e21e8467
SH		 2005 idev = ipv6_find_idev(dev);
2006 if (!idev)
64e724f6
BH		 2007 return ERR_PTR(-ENOBUFS);
2008
2009 if (idev->cnf.disable_ipv6)
2010 return ERR_PTR(-EACCES);
1da177e4
LT		 2011
2012 /* Add default multicast route */
4af04aba
LW		 2013 if (!(dev->flags & IFF_LOOPBACK))
2014 addrconf_add_mroute(dev);
1da177e4 2015
1da177e4
LT		 2016 return idev;
2017}
2018
e6bff995 2019void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2020{
2021 struct prefix_info *pinfo;
2022 __u32 valid_lft;
2023 __u32 prefered_lft;
2024 int addr_type;
1da177e4 2025 struct inet6_dev *in6_dev;
56d417b1 2026 struct net *net = dev_net(dev);
1da177e4
LT		 2027
2028 pinfo = (struct prefix_info *) opt;
1ab1457c 2029
1da177e4 2030 if (len < sizeof(struct prefix_info)) {
ba3542e1 2031 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2032 return;
2033 }
1ab1457c 2034
1da177e4
LT		 2035 /*
2036 * Validation checks ([ADDRCONF], page 19)
2037 */
2038
2039 addr_type = ipv6_addr_type(&pinfo->prefix);
2040
2041 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2042 return;
2043
2044 valid_lft = ntohl(pinfo->valid);
2045 prefered_lft = ntohl(pinfo->prefered);
2046
2047 if (prefered_lft > valid_lft) {
e87cc472 2048 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2049 return;
2050 }
2051
2052 in6_dev = in6_dev_get(dev);
2053
2054 if (in6_dev == NULL) {
e87cc472
JP		 2055 net_dbg_ratelimited("addrconf: device %s not configured\n",
2056 dev->name);
1da177e4
LT		 2057 return;
2058 }
2059
2060 /*
2061 * Two things going on here:
2062 * 1) Add routes for on-link prefixes
2063 * 2) Configure prefixes with the auto flag set
2064 */
2065
4bed72e4
YH		 2066 if (pinfo->onlink) {
2067 struct rt6_info *rt;
2068 unsigned long rt_expires;
2069
6f704992
YH		 2070 /* Avoid arithmetic overflow. Really, we could
2071 * save rt_expires in seconds, likely valid_lft,
2072 * but it would require division in fib gc, that it
2073 * not good.
2074 */
4bed72e4
YH		 2075 if (HZ > USER_HZ)
2076 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2077 else
2078 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2079
4bed72e4
YH		 2080 if (addrconf_finite_timeout(rt_expires))
2081 rt_expires *= HZ;
1da177e4 2082
14ef37b6
AH		 2083 rt = addrconf_get_prefix_route(&pinfo->prefix,
2084 pinfo->prefix_len,
2085 dev,
2086 RTF_ADDRCONF | RTF_PREFIX_RT,
2087 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2088
14ef37b6 2089 if (rt) {
6f704992
YH		 2090 /* Autoconf prefix route */
2091 if (valid_lft == 0) {
2092 ip6_del_rt(rt);
2093 rt = NULL;
4bed72e4 2094 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2095 /* not infinity */
1716a961 2096 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2097 } else {
1716a961 2098 rt6_clean_expires(rt);
1da177e4
LT		 2099 }
2100 } else if (valid_lft) {
6f704992 2101 clock_t expires = 0;
4bed72e4
YH		 2102 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2103 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2104 /* not infinity */
2105 flags |= RTF_EXPIRES;
2106 expires = jiffies_to_clock_t(rt_expires);
2107 }
1da177e4 2108 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2109 dev, expires, flags);
1da177e4 2110 }
94e187c0 2111 ip6_rt_put(rt);
1da177e4
LT		 2112 }
2113
2114 /* Try to figure out our local address for this prefix */
2115
2116 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2117 struct inet6_ifaddr *ifp;
1da177e4
LT		 2118 struct in6_addr addr;
2119 int create = 0, update_lft = 0;
617fe29d 2120 bool tokenized = false;
1da177e4
LT		 2121
2122 if (pinfo->prefix_len == 64) {
2123 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2124
2125 if (!ipv6_addr_any(&in6_dev->token)) {
2126 read_lock_bh(&in6_dev->lock);
2127 memcpy(addr.s6_addr + 8,
2128 in6_dev->token.s6_addr + 8, 8);
2129 read_unlock_bh(&in6_dev->lock);
617fe29d 2130 tokenized = true;
f53adae4
DB		 2131 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2132 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1da177e4
LT		 2133 in6_dev_put(in6_dev);
2134 return;
2135 }
2136 goto ok;
2137 }
e87cc472
JP		 2138 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2139 pinfo->prefix_len);
1da177e4
LT		 2140 in6_dev_put(in6_dev);
2141 return;
2142
2143ok:
2144
53b7997f 2145 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 2146
2147 if (ifp == NULL && valid_lft) {
2148 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2149 u32 addr_flags = 0;
2150
2151#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2152 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2153 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 2154 addr_flags = IFA_F_OPTIMISTIC;
2155#endif
1da177e4
LT		 2156
2157 /* Do not allow to create too much of autoconfigured
2158 * addresses; this would be too easy way to crash kernel.
2159 */
2160 if (!max_addresses ||
2161 ipv6_count_addresses(in6_dev) < max_addresses)
3f8f5298
JP		 2162 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2163 pinfo->prefix_len,
95c385b4 2164 addr_type&IPV6_ADDR_SCOPE_MASK,
8a226b2c
JB		 2165 addr_flags, valid_lft,
2166 prefered_lft);
1da177e4 2167
3f0d2ba0 2168 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2169 in6_dev_put(in6_dev);
2170 return;
2171 }
2172
8a226b2c
JB		 2173 update_lft = 0;
2174 create = 1;
1da177e4 2175 ifp->cstamp = jiffies;
617fe29d 2176 ifp->tokenized = tokenized;
cf22f9a2 2177 addrconf_dad_start(ifp);
1da177e4
LT		 2178 }
2179
2180 if (ifp) {
2181 int flags;
2182 unsigned long now;
1da177e4 2183 struct inet6_ifaddr *ift;
1da177e4
LT		 2184 u32 stored_lft;
2185
2186 /* update lifetime (RFC2462 5.5.3 e) */
2187 spin_lock(&ifp->lock);
2188 now = jiffies;
2189 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2190 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2191 else
2192 stored_lft = 0;
8a226b2c 2193 if (!update_lft && !create && stored_lft) {
c9d55d5b
PM		 2194 const u32 minimum_lft = min(
2195 stored_lft, (u32)MIN_VALID_LIFETIME);
2196 valid_lft = max(valid_lft, minimum_lft);
2197
2198 /* RFC4862 Section 5.5.3e:
2199 * "Note that the preferred lifetime of the
2200 * corresponding address is always reset to
2201 * the Preferred Lifetime in the received
2202 * Prefix Information option, regardless of
2203 * whether the valid lifetime is also reset or
2204 * ignored."
2205 *
2206 * So we should always update prefered_lft here.
2207 */
2208 update_lft = 1;
1da177e4
LT		 2209 }
2210
2211 if (update_lft) {
2212 ifp->valid_lft = valid_lft;
2213 ifp->prefered_lft = prefered_lft;
2214 ifp->tstamp = now;
2215 flags = ifp->flags;
2216 ifp->flags &= ~IFA_F_DEPRECATED;
2217 spin_unlock(&ifp->lock);
2218
2219 if (!(flags&IFA_F_TENTATIVE))
2220 ipv6_ifa_notify(0, ifp);
2221 } else
2222 spin_unlock(&ifp->lock);
2223
1da177e4
LT		 2224 read_lock_bh(&in6_dev->lock);
2225 /* update all temporary addresses in the list */
76f793e3
LC		 2226 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2227 tmp_list) {
2228 int age, max_valid, max_prefered;
2229
c6fbfac2
BB		 2230 if (ifp != ift->ifpub)
2231 continue;
2232
76f793e3
LC		 2233 /*
2234 * RFC 4941 section 3.3:
2235 * If a received option will extend the lifetime
2236 * of a public address, the lifetimes of
2237 * temporary addresses should be extended,
2238 * subject to the overall constraint that no
2239 * temporary addresses should ever remain
2240 * "valid" or "preferred" for a time longer than
2241 * (TEMP_VALID_LIFETIME) or
2242 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2243 * respectively.
2244 */
2245 age = (now - ift->cstamp) / HZ;
2246 max_valid = in6_dev->cnf.temp_valid_lft - age;
2247 if (max_valid < 0)
2248 max_valid = 0;
2249
2250 max_prefered = in6_dev->cnf.temp_prefered_lft -
2251 in6_dev->cnf.max_desync_factor -
2252 age;
2253 if (max_prefered < 0)
2254 max_prefered = 0;
2255
2256 if (valid_lft > max_valid)
2257 valid_lft = max_valid;
2258
2259 if (prefered_lft > max_prefered)
2260 prefered_lft = max_prefered;
2261
1da177e4
LT		 2262 spin_lock(&ift->lock);
2263 flags = ift->flags;
76f793e3
LC		 2264 ift->valid_lft = valid_lft;
2265 ift->prefered_lft = prefered_lft;
2266 ift->tstamp = now;
2267 if (prefered_lft > 0)
2268 ift->flags &= ~IFA_F_DEPRECATED;
2269
1da177e4
LT		 2270 spin_unlock(&ift->lock);
2271 if (!(flags&IFA_F_TENTATIVE))
2272 ipv6_ifa_notify(0, ift);
2273 }
2274
aed65501 2275 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
1da177e4 2276 /*
76f793e3
LC		 2277 * When a new public address is created as
2278 * described in [ADDRCONF], also create a new
2279 * temporary address. Also create a temporary
2280 * address if it's enabled but no temporary
2281 * address currently exists.
1da177e4 2282 */
1ab1457c 2283 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 2284 ipv6_create_tempaddr(ifp, NULL);
2285 } else {
2286 read_unlock_bh(&in6_dev->lock);
2287 }
5d9efa7e 2288
1da177e4
LT		 2289 in6_ifa_put(ifp);
2290 addrconf_verify(0);
2291 }
2292 }
2293 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2294 in6_dev_put(in6_dev);
2295}
2296
2297/*
2298 * Set destination address.
2299 * Special case for SIT interfaces where we create a new "virtual"
2300 * device.
2301 */
af284937 2302int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2303{
2304 struct in6_ifreq ireq;
2305 struct net_device *dev;
2306 int err = -EINVAL;
2307
2308 rtnl_lock();
2309
2310 err = -EFAULT;
2311 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2312 goto err_exit;
2313
af284937 2314 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2315
2316 err = -ENODEV;
2317 if (dev == NULL)
2318 goto err_exit;
2319
07a93626 2320#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2321 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2322 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2323 struct ifreq ifr;
1da177e4
LT		 2324 struct ip_tunnel_parm p;
2325
2326 err = -EADDRNOTAVAIL;
2327 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2328 goto err_exit;
2329
2330 memset(&p, 0, sizeof(p));
2331 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2332 p.iph.saddr = 0;
2333 p.iph.version = 4;
2334 p.iph.ihl = 5;
2335 p.iph.protocol = IPPROTO_IPV6;
2336 p.iph.ttl = 64;
d20b3109 2337 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2338
5bc3eb7e
SH		 2339 if (ops->ndo_do_ioctl) {
2340 mm_segment_t oldfs = get_fs();
2341
2342 set_fs(KERNEL_DS);
2343 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2344 set_fs(oldfs);
2345 } else
2346 err = -EOPNOTSUPP;
1da177e4
LT		 2347
2348 if (err == 0) {
2349 err = -ENOBUFS;
af284937
DL		 2350 dev = __dev_get_by_name(net, p.name);
2351 if (!dev)
1da177e4
LT		 2352 goto err_exit;
2353 err = dev_open(dev);
2354 }
2355 }
0be669bb 2356#endif
1da177e4
LT		 2357
2358err_exit:
2359 rtnl_unlock();
2360 return err;
2361}
2362
2363/*
2364 * Manual configuration of address on an interface
2365 */
b71d1d42 2366static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
caeaba79 2367 const struct in6_addr *peer_pfx,
24ef0da7 2368 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2369 __u32 valid_lft)
1da177e4
LT		 2370{
2371 struct inet6_ifaddr *ifp;
2372 struct inet6_dev *idev;
2373 struct net_device *dev;
2374 int scope;
6f704992
YH		 2375 u32 flags;
2376 clock_t expires;
4bed72e4 2377 unsigned long timeout;
1da177e4
LT		 2378
2379 ASSERT_RTNL();
1ab1457c 2380
24ef0da7
TG		 2381 if (plen > 128)
2382 return -EINVAL;
2383
0778769d
NT		 2384 /* check the lifetime */
2385 if (!valid_lft || prefered_lft > valid_lft)
2386 return -EINVAL;
2387
af284937
DL		 2388 dev = __dev_get_by_index(net, ifindex);
2389 if (!dev)
1da177e4 2390 return -ENODEV;
1ab1457c 2391
64e724f6
BH		 2392 idev = addrconf_add_dev(dev);
2393 if (IS_ERR(idev))
2394 return PTR_ERR(idev);
1da177e4
LT		 2395
2396 scope = ipv6_addr_scope(pfx);
2397
4bed72e4
YH		 2398 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2399 if (addrconf_finite_timeout(timeout)) {
2400 expires = jiffies_to_clock_t(timeout * HZ);
2401 valid_lft = timeout;
6f704992 2402 flags = RTF_EXPIRES;
4bed72e4
YH		 2403 } else {
2404 expires = 0;
2405 flags = 0;
2406 ifa_flags |= IFA_F_PERMANENT;
6f704992 2407 }
0778769d 2408
4bed72e4
YH		 2409 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2410 if (addrconf_finite_timeout(timeout)) {
2411 if (timeout == 0)
2412 ifa_flags |= IFA_F_DEPRECATED;
2413 prefered_lft = timeout;
2414 }
0778769d 2415
8a226b2c
JB		 2416 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2417 valid_lft, prefered_lft);
0778769d 2418
1da177e4 2419 if (!IS_ERR(ifp)) {
46d48046 2420 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2421 expires, flags);
95c385b4
NH		 2422 /*
2423 * Note that section 3.1 of RFC 4429 indicates
2424 * that the Optimistic flag should not be set for
2425 * manually configured addresses
2426 */
cf22f9a2 2427 addrconf_dad_start(ifp);
1da177e4 2428 in6_ifa_put(ifp);
0778769d 2429 addrconf_verify(0);
1da177e4
LT		 2430 return 0;
2431 }
2432
2433 return PTR_ERR(ifp);
2434}
2435
b71d1d42 2436static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2437 unsigned int plen)
1da177e4
LT		 2438{
2439 struct inet6_ifaddr *ifp;
2440 struct inet6_dev *idev;
2441 struct net_device *dev;
1ab1457c 2442
24ef0da7
TG		 2443 if (plen > 128)
2444 return -EINVAL;
2445
af284937
DL		 2446 dev = __dev_get_by_index(net, ifindex);
2447 if (!dev)
1da177e4
LT		 2448 return -ENODEV;
2449
7eaa48a4 2450 if ((idev = __in6_dev_get(dev)) == NULL)
1da177e4
LT		 2451 return -ENXIO;
2452
2453 read_lock_bh(&idev->lock);
502a2ffd 2454 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2455 if (ifp->prefix_len == plen &&
2456 ipv6_addr_equal(pfx, &ifp->addr)) {
2457 in6_ifa_hold(ifp);
2458 read_unlock_bh(&idev->lock);
1ab1457c 2459
1da177e4 2460 ipv6_del_addr(ifp);
1da177e4
LT		 2461 return 0;
2462 }
2463 }
2464 read_unlock_bh(&idev->lock);
2465 return -EADDRNOTAVAIL;
2466}
2467
2468
af284937 2469int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2470{
2471 struct in6_ifreq ireq;
2472 int err;
1ab1457c 2473
af31f412 2474 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2475 return -EPERM;
1ab1457c 2476
1da177e4
LT		 2477 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2478 return -EFAULT;
2479
2480 rtnl_lock();
caeaba79 2481 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2482 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2483 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2484 rtnl_unlock();
2485 return err;
2486}
2487
af284937 2488int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2489{
2490 struct in6_ifreq ireq;
2491 int err;
1ab1457c 2492
af31f412 2493 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2494 return -EPERM;
2495
2496 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2497 return -EFAULT;
2498
2499 rtnl_lock();
af284937
DL		 2500 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2501 ireq.ifr6_prefixlen);
1da177e4
LT		 2502 rtnl_unlock();
2503 return err;
2504}
2505
b5f348e5
IJ		 2506static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2507 int plen, int scope)
2508{
2509 struct inet6_ifaddr *ifp;
2510
8a226b2c
JB		 2511 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2512 scope, IFA_F_PERMANENT, 0, 0);
b5f348e5
IJ		 2513 if (!IS_ERR(ifp)) {
2514 spin_lock_bh(&ifp->lock);
2515 ifp->flags &= ~IFA_F_TENTATIVE;
2516 spin_unlock_bh(&ifp->lock);
2517 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2518 in6_ifa_put(ifp);
2519 }
2520}
2521
07a93626 2522#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2523static void sit_add_v4_addrs(struct inet6_dev *idev)
2524{
1da177e4
LT		 2525 struct in6_addr addr;
2526 struct net_device *dev;
c346dca1 2527 struct net *net = dev_net(idev->dev);
929c9cf3 2528 int scope, plen;
f0e2acfa 2529 u32 pflags = 0;
1da177e4
LT		 2530
2531 ASSERT_RTNL();
2532
2533 memset(&addr, 0, sizeof(struct in6_addr));
2534 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2535
2536 if (idev->dev->flags&IFF_POINTOPOINT) {
2537 addr.s6_addr32[0] = htonl(0xfe800000);
2538 scope = IFA_LINK;
929c9cf3 2539 plen = 64;
1da177e4
LT		 2540 } else {
2541 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2542 plen = 96;
f0e2acfa 2543 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2544 }
2545
2546 if (addr.s6_addr32[3]) {
929c9cf3 2547 add_addr(idev, &addr, plen, scope);
f0e2acfa 2548 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2549 return;
2550 }
2551
6fda7350 2552 for_each_netdev(net, dev) {
8e5e8f30 2553 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2554 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2555 struct in_ifaddr *ifa;
1da177e4
LT		 2556
2557 int flag = scope;
2558
2559 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2560
2561 addr.s6_addr32[3] = ifa->ifa_local;
2562
2563 if (ifa->ifa_scope == RT_SCOPE_LINK)
2564 continue;
2565 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2566 if (idev->dev->flags&IFF_POINTOPOINT)
2567 continue;
2568 flag |= IFA_HOST;
2569 }
1da177e4 2570
b5f348e5 2571 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2572 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2573 pflags);
1da177e4
LT		 2574 }
2575 }
1ab1457c 2576 }
1da177e4 2577}
0be669bb 2578#endif
1da177e4
LT		 2579
2580static void init_loopback(struct net_device *dev)
2581{
2582 struct inet6_dev *idev;
25fb6ca4
BK		 2583 struct net_device *sp_dev;
2584 struct inet6_ifaddr *sp_ifa;
2585 struct rt6_info *sp_rt;
1da177e4
LT		 2586
2587 /* ::1 */
2588
2589 ASSERT_RTNL();
2590
7eaa48a4 2591 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2592 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2593 return;
2594 }
2595
b5f348e5 2596 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2597
2598 /* Add routes to other interface's IPv6 addresses */
2599 for_each_netdev(dev_net(dev), sp_dev) {
2600 if (!strcmp(sp_dev->name, dev->name))
2601 continue;
2602
2603 idev = __in6_dev_get(sp_dev);
2604 if (!idev)
2605 continue;
2606
2607 read_lock_bh(&idev->lock);
2608 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2609
2610 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2611 continue;
2612
a881ae1f
G		 2613 if (sp_ifa->rt)
2614 continue;
2615
25fb6ca4
BK		 2616 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
2617
2618 /* Failure cases are ignored */
534c8779
G		 2619 if (!IS_ERR(sp_rt)) {
2620 sp_ifa->rt = sp_rt;
25fb6ca4 2621 ip6_ins_rt(sp_rt);
534c8779 2622 }
25fb6ca4
BK		 2623 }
2624 read_unlock_bh(&idev->lock);
2625 }
1da177e4
LT		 2626}
2627
b71d1d42 2628static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4 2629{
8e5e8f30 2630 struct inet6_ifaddr *ifp;
95c385b4
NH		 2631 u32 addr_flags = IFA_F_PERMANENT;
2632
2633#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2634 if (idev->cnf.optimistic_dad &&
702beb87 2635 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2636 addr_flags |= IFA_F_OPTIMISTIC;
2637#endif
1da177e4 2638
95c385b4 2639
8a226b2c 2640 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 0, 0);
1da177e4 2641 if (!IS_ERR(ifp)) {
46d48046 2642 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2643 addrconf_dad_start(ifp);
1da177e4
LT		 2644 in6_ifa_put(ifp);
2645 }
2646}
2647
2648static void addrconf_dev_config(struct net_device *dev)
2649{
2650 struct in6_addr addr;
8e5e8f30 2651 struct inet6_dev *idev;
1da177e4
LT		 2652
2653 ASSERT_RTNL();
2654
74235a25
HX		 2655 if ((dev->type != ARPHRD_ETHER) &&
2656 (dev->type != ARPHRD_FDDI) &&
74235a25 2657 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 2658 (dev->type != ARPHRD_INFINIBAND) &&
cb6bf355 2659 (dev->type != ARPHRD_IEEE802154) &&
e837735e
ND		 2660 (dev->type != ARPHRD_IEEE1394) &&
2661 (dev->type != ARPHRD_TUNNEL6)) {
74235a25
HX		 2662 /* Alas, we support only Ethernet autoconfiguration. */
2663 return;
2664 }
2665
1da177e4 2666 idev = addrconf_add_dev(dev);
64e724f6 2667 if (IS_ERR(idev))
1da177e4
LT		 2668 return;
2669
2670 memset(&addr, 0, sizeof(struct in6_addr));
2671 addr.s6_addr32[0] = htonl(0xFE800000);
2672
2673 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2674 addrconf_add_linklocal(idev, &addr);
2675}
2676
07a93626 2677#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2678static void addrconf_sit_config(struct net_device *dev)
2679{
2680 struct inet6_dev *idev;
2681
2682 ASSERT_RTNL();
2683
1ab1457c
YH		 2684 /*
2685 * Configure the tunnel with one of our IPv4
2686 * addresses... we should configure all of
1da177e4
LT		 2687 * our v4 addrs in the tunnel
2688 */
2689
7eaa48a4 2690 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2691 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2692 return;
2693 }
2694
c7dc89c0
FT		 2695 if (dev->priv_flags & IFF_ISATAP) {
2696 struct in6_addr addr;
2697
2698 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
c7dc89c0
FT		 2699 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2700 addrconf_add_linklocal(idev, &addr);
2701 return;
2702 }
2703
1da177e4
LT		 2704 sit_add_v4_addrs(idev);
2705
62b54dd9 2706 if (dev->flags&IFF_POINTOPOINT)
1da177e4 2707 addrconf_add_mroute(dev);
1da177e4 2708}
0be669bb 2709#endif
1da177e4 2710
07a93626 2711#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2712static void addrconf_gre_config(struct net_device *dev)
2713{
2714 struct inet6_dev *idev;
2715 struct in6_addr addr;
2716
aee80b54 2717 ASSERT_RTNL();
2718
7eaa48a4 2719 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2720 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 2721 return;
2722 }
2723
2724 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
aee80b54 2725 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2726 addrconf_add_linklocal(idev, &addr);
2727}
2728#endif
2729
1da177e4
LT		 2730static inline int
2731ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2732{
2733 struct in6_addr lladdr;
2734
95c385b4 2735 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2736 addrconf_add_linklocal(idev, &lladdr);
2737 return 0;
2738 }
2739 return -1;
2740}
2741
1ab1457c 2742static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 2743 void *ptr)
1da177e4 2744{
351638e7 2745 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 2746 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2747 int run_pending = 0;
b217d616 2748 int err;
1da177e4 2749
e21e8467 2750 switch (event) {
45ba9dd2 2751 case NETDEV_REGISTER:
74235a25 2752 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2753 idev = ipv6_add_dev(dev);
2754 if (!idev)
b217d616 2755 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2756 }
2757 break;
bcdd553f 2758
1da177e4 2759 case NETDEV_UP:
3c21edbd 2760 case NETDEV_CHANGE:
c2edacf8
JV		 2761 if (dev->flags & IFF_SLAVE)
2762 break;
2763
3c21edbd 2764 if (event == NETDEV_UP) {
f24e3d65 2765 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 2766 /* device is not ready yet. */
f3213831 2767 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 2768 dev->name);
2769 break;
2770 }
99081049 2771
d31c7b8f
EP		 2772 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2773 idev = ipv6_add_dev(dev);
2774
e3ec6cfc 2775 if (idev) {
99081049 2776 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2777 run_pending = 1;
2778 }
3c21edbd 2779 } else {
f24e3d65 2780 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2781 /* device is still not ready. */
2782 break;
2783 }
2784
2785 if (idev) {
bcdd553f 2786 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2787 /* device is already configured. */
2788 break;
3c21edbd
YH		 2789 idev->if_flags |= IF_READY;
2790 }
2791
f3213831
JP		 2792 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2793 dev->name);
3c21edbd 2794
c5e33bdd 2795 run_pending = 1;
3c21edbd
YH		 2796 }
2797
e21e8467 2798 switch (dev->type) {
07a93626 2799#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2800 case ARPHRD_SIT:
2801 addrconf_sit_config(dev);
2802 break;
aee80b54 2803#endif
07a93626 2804#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2805 case ARPHRD_IPGRE:
2806 addrconf_gre_config(dev);
2807 break;
0be669bb 2808#endif
1da177e4
LT		 2809 case ARPHRD_LOOPBACK:
2810 init_loopback(dev);
2811 break;
2812
2813 default:
2814 addrconf_dev_config(dev);
2815 break;
3ff50b79 2816 }
bcdd553f 2817
1da177e4 2818 if (idev) {
c5e33bdd
YH		 2819 if (run_pending)
2820 addrconf_dad_run(idev);
2821
bcdd553f
SH		 2822 /*
2823 * If the MTU changed during the interface down,
2824 * when the interface up, the changed MTU must be
2825 * reflected in the idev as well as routers.
1da177e4 2826 */
bcdd553f
SH		 2827 if (idev->cnf.mtu6 != dev->mtu &&
2828 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2829 rt6_mtu_change(dev, dev->mtu);
2830 idev->cnf.mtu6 = dev->mtu;
2831 }
2832 idev->tstamp = jiffies;
2833 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2834
2835 /*
2836 * If the changed mtu during down is lower than
2837 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2838 */
2839 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2840 addrconf_ifdown(dev, 1);
1da177e4
LT		 2841 }
2842 break;
2843
2844 case NETDEV_CHANGEMTU:
d31c7b8f 2845 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2846 rt6_mtu_change(dev, dev->mtu);
2847 idev->cnf.mtu6 = dev->mtu;
2848 break;
2849 }
2850
d31c7b8f
EP		 2851 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2852 idev = ipv6_add_dev(dev);
2853 if (idev)
2854 break;
2855 }
2856
bcdd553f
SH		 2857 /*
2858 * MTU falled under IPV6_MIN_MTU.
2859 * Stop IPv6 on this interface.
2860 */
1da177e4
LT		 2861
2862 case NETDEV_DOWN:
2863 case NETDEV_UNREGISTER:
2864 /*
2865 * Remove all addresses from this interface.
2866 */
2867 addrconf_ifdown(dev, event != NETDEV_DOWN);
2868 break;
3c21edbd 2869
1da177e4 2870 case NETDEV_CHANGENAME:
1da177e4 2871 if (idev) {
5632c515 2872 snmp6_unregister_dev(idev);
408c4768 2873 addrconf_sysctl_unregister(idev);
f52295a9 2874 addrconf_sysctl_register(idev);
b217d616
HX		 2875 err = snmp6_register_dev(idev);
2876 if (err)
2877 return notifier_from_errno(err);
5632c515 2878 }
1da177e4 2879 break;
bcdd553f 2880
93d9b7d7
JP		 2881 case NETDEV_PRE_TYPE_CHANGE:
2882 case NETDEV_POST_TYPE_CHANGE:
2883 addrconf_type_change(dev, event);
75c78500 2884 break;
3ff50b79 2885 }
1da177e4
LT		 2886
2887 return NOTIFY_OK;
2888}
2889
2890/*
2891 * addrconf module should be notified of a device going up
2892 */
2893static struct notifier_block ipv6_dev_notf = {
2894 .notifier_call = addrconf_notify,
1da177e4
LT		 2895};
2896
93d9b7d7 2897static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2898{
2899 struct inet6_dev *idev;
2900 ASSERT_RTNL();
2901
2902 idev = __in6_dev_get(dev);
2903
93d9b7d7 2904 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2905 ipv6_mc_remap(idev);
93d9b7d7 2906 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2907 ipv6_mc_unmap(idev);
2908}
2909
1da177e4
LT		 2910static int addrconf_ifdown(struct net_device *dev, int how)
2911{
c346dca1 2912 struct net *net = dev_net(dev);
502a2ffd 2913 struct inet6_dev *idev;
2914 struct inet6_ifaddr *ifa;
73a8bd74 2915 int state, i;
1da177e4
LT		 2916
2917 ASSERT_RTNL();
2918
73a8bd74
DM		 2919 rt6_ifdown(net, dev);
2920 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 2921
2922 idev = __in6_dev_get(dev);
2923 if (idev == NULL)
2924 return -ENODEV;
2925
bcdd553f
SH		 2926 /*
2927 * Step 1: remove reference to ipv6 device from parent device.
2928 * Do not dev_put!
1da177e4 2929 */
439e2385 2930 if (how) {
1da177e4 2931 idev->dead = 1;
8814c4b5
YH		 2932
2933 /* protected by rtnl_lock */
a9b3cd7f 2934 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 2935
2936 /* Step 1.5: remove snmp6 entry */
2937 snmp6_unregister_dev(idev);
2938
2939 }
2940
73a8bd74
DM		 2941 /* Step 2: clear hash table */
2942 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2943 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 2944
2945 spin_lock_bh(&addrconf_hash_lock);
2946 restart:
b67bfe0d 2947 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74
DM		 2948 if (ifa->idev == idev) {
2949 hlist_del_init_rcu(&ifa->addr_lst);
b7b1bfce 2950 addrconf_del_dad_timer(ifa);
73a8bd74
DM		 2951 goto restart;
2952 }
2953 }
2954 spin_unlock_bh(&addrconf_hash_lock);
2955 }
2956
1da177e4
LT		 2957 write_lock_bh(&idev->lock);
2958
b7b1bfce
HFS		 2959 addrconf_del_rs_timer(idev);
2960
bcdd553f 2961 /* Step 2: clear flags for stateless addrconf */
439e2385 2962 if (!how)
3c21edbd 2963 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 2964
439e2385 2965 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2966 in6_dev_put(idev);
2967
bcdd553f 2968 /* Step 3: clear tempaddr list */
372e6c8f 2969 while (!list_empty(&idev->tempaddr_list)) {
2970 ifa = list_first_entry(&idev->tempaddr_list,
2971 struct inet6_ifaddr, tmp_list);
2972 list_del(&ifa->tmp_list);
1da177e4
LT		 2973 write_unlock_bh(&idev->lock);
2974 spin_lock_bh(&ifa->lock);
2975
2976 if (ifa->ifpub) {
2977 in6_ifa_put(ifa->ifpub);
2978 ifa->ifpub = NULL;
2979 }
2980 spin_unlock_bh(&ifa->lock);
2981 in6_ifa_put(ifa);
2982 write_lock_bh(&idev->lock);
2983 }
8f37ada5 2984
502a2ffd 2985 while (!list_empty(&idev->addr_list)) {
2986 ifa = list_first_entry(&idev->addr_list,
2987 struct inet6_ifaddr, if_list);
b7b1bfce 2988 addrconf_del_dad_timer(ifa);
84e8b803 2989
73a8bd74 2990 list_del(&ifa->if_list);
84e8b803 2991
73a8bd74 2992 write_unlock_bh(&idev->lock);
84e8b803 2993
73a8bd74
DM		 2994 spin_lock_bh(&ifa->state_lock);
2995 state = ifa->state;
2996 ifa->state = INET6_IFADDR_STATE_DEAD;
2997 spin_unlock_bh(&ifa->state_lock);
9d82ca98 2998
73a8bd74
DM		 2999 if (state != INET6_IFADDR_STATE_DEAD) {
3000 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3001 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 3002 }
73a8bd74 3003 in6_ifa_put(ifa);
8f37ada5 3004
73a8bd74
DM		 3005 write_lock_bh(&idev->lock);
3006 }
8f37ada5 3007
1da177e4
LT		 3008 write_unlock_bh(&idev->lock);
3009
3010 /* Step 5: Discard multicast list */
439e2385 3011 if (how)
1da177e4
LT		 3012 ipv6_mc_destroy_dev(idev);
3013 else
3014 ipv6_mc_down(idev);
3015
1da177e4 3016 idev->tstamp = jiffies;
1ab1457c 3017
bcdd553f 3018 /* Last: Shot the device (if unregistered) */
439e2385 3019 if (how) {
408c4768 3020 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3021 neigh_parms_release(&nd_tbl, idev->nd_parms);
3022 neigh_ifdown(&nd_tbl, dev);
3023 in6_dev_put(idev);
3024 }
3025 return 0;
3026}
3027
3028static void addrconf_rs_timer(unsigned long data)
3029{
b7b1bfce 3030 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3031 struct net_device *dev = idev->dev;
b7b1bfce 3032 struct in6_addr lladdr;
1da177e4 3033
b7b1bfce 3034 write_lock(&idev->lock);
5b2a1953 3035 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3036 goto out;
3037
9ba2add3 3038 if (!ipv6_accept_ra(idev))
5b2a1953 3039 goto out;
3040
3041 /* Announcement received after solicitation was sent */
3042 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3043 goto out;
1da177e4 3044
b7b1bfce 3045 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
caf92bc4
CW		 3046 write_unlock(&idev->lock);
3047 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3048 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3049 &in6addr_linklocal_allrouters);
3050 else
caf92bc4 3051 goto put;
1da177e4 3052
caf92bc4 3053 write_lock(&idev->lock);
b7b1bfce
HFS		 3054 /* The wait after the last probe can be shorter */
3055 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3056 idev->cnf.rtr_solicits) ?
3057 idev->cnf.rtr_solicit_delay :
3058 idev->cnf.rtr_solicit_interval);
1da177e4 3059 } else {
1da177e4
LT		 3060 /*
3061 * Note: we do not support deprecated "all on-link"
3062 * assumption any longer.
3063 */
91df42be 3064 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3065 }
3066
3067out:
b7b1bfce 3068 write_unlock(&idev->lock);
caf92bc4 3069put:
b7b1bfce 3070 in6_dev_put(idev);
1da177e4
LT		 3071}
3072
3073/*
3074 * Duplicate Address Detection
3075 */
3c21edbd
YH		 3076static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3077{
3078 unsigned long rand_num;
3079 struct inet6_dev *idev = ifp->idev;
3080
95c385b4
NH		 3081 if (ifp->flags & IFA_F_OPTIMISTIC)
3082 rand_num = 0;
3083 else
3084 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3085
b7b1bfce
HFS		 3086 ifp->dad_probes = idev->cnf.dad_transmits;
3087 addrconf_mod_dad_timer(ifp, rand_num);
3c21edbd
YH		 3088}
3089
cf22f9a2 3090static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4
LT		 3091{
3092 struct inet6_dev *idev = ifp->idev;
3093 struct net_device *dev = idev->dev;
1da177e4
LT		 3094
3095 addrconf_join_solict(dev, &ifp->addr);
3096
1da177e4 3097 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 3098
3099 read_lock_bh(&idev->lock);
622ccdf1 3100 spin_lock(&ifp->lock);
e9d3e084 3101 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3102 goto out;
1da177e4
LT		 3103
3104 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3105 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3106 !(ifp->flags&IFA_F_TENTATIVE) ||
3107 ifp->flags & IFA_F_NODAD) {
cc411d0b 3108 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3109 spin_unlock(&ifp->lock);
1da177e4
LT		 3110 read_unlock_bh(&idev->lock);
3111
3112 addrconf_dad_completed(ifp);
3113 return;
3114 }
3115
6732bade 3116 if (!(idev->if_flags & IF_READY)) {
21809faf 3117 spin_unlock(&ifp->lock);
6732bade 3118 read_unlock_bh(&idev->lock);
3c21edbd 3119 /*
590a9887 3120 * If the device is not ready:
3c21edbd
YH		 3121 * - keep it tentative if it is a permanent address.
3122 * - otherwise, kill it.
3123 */
3124 in6_ifa_hold(ifp);
cc411d0b 3125 addrconf_dad_stop(ifp, 0);
6732bade 3126 return;
3c21edbd 3127 }
95c385b4
NH		 3128
3129 /*
3130 * Optimistic nodes can start receiving
3131 * Frames right away
3132 */
e21e8467 3133 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 3134 ip6_ins_rt(ifp->rt);
3135
6732bade 3136 addrconf_dad_kick(ifp);
1da177e4 3137out:
622ccdf1 3138 spin_unlock(&ifp->lock);
1da177e4
LT		 3139 read_unlock_bh(&idev->lock);
3140}
3141
3142static void addrconf_dad_timer(unsigned long data)
3143{
3144 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3145 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3146 struct in6_addr mcaddr;
3147
b7b1bfce 3148 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3149 goto out;
3150
b7b1bfce 3151 write_lock(&idev->lock);
122e4519 3152 if (idev->dead || !(idev->if_flags & IF_READY)) {
b7b1bfce 3153 write_unlock(&idev->lock);
1da177e4
LT		 3154 goto out;
3155 }
21809faf 3156
3157 spin_lock(&ifp->lock);
622ccdf1
HX		 3158 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3159 spin_unlock(&ifp->lock);
b7b1bfce 3160 write_unlock(&idev->lock);
622ccdf1
HX		 3161 goto out;
3162 }
3163
b7b1bfce 3164 if (ifp->dad_probes == 0) {
1da177e4
LT		 3165 /*
3166 * DAD was successful
3167 */
3168
cc411d0b 3169 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3170 spin_unlock(&ifp->lock);
b7b1bfce 3171 write_unlock(&idev->lock);
1da177e4
LT		 3172
3173 addrconf_dad_completed(ifp);
3174
3175 goto out;
3176 }
3177
b7b1bfce
HFS		 3178 ifp->dad_probes--;
3179 addrconf_mod_dad_timer(ifp, ifp->idev->nd_parms->retrans_time);
21809faf 3180 spin_unlock(&ifp->lock);
b7b1bfce 3181 write_unlock(&idev->lock);
1da177e4
LT		 3182
3183 /* send a neighbour solicitation for our addr */
1da177e4 3184 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3185 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3186out:
3187 in6_ifa_put(ifp);
3188}
3189
3190static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3191{
e21e8467 3192 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3193 struct in6_addr lladdr;
b173ee48 3194 bool send_rs, send_mld;
b7b1bfce
HFS		 3195
3196 addrconf_del_dad_timer(ifp);
1da177e4
LT		 3197
3198 /*
3199 * Configure the address for reception. Now it is valid.
3200 */
3201
3202 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3203
026359bc
TA		 3204 /* If added prefix is link local and we are prepared to process
3205 router advertisements, start sending router solicitations.
1da177e4
LT		 3206 */
3207
1ec047eb
HFS		 3208 read_lock_bh(&ifp->idev->lock);
3209 spin_lock(&ifp->lock);
b173ee48
HFS		 3210 send_mld = ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL &&
3211 ifp->idev->valid_ll_addr_cnt == 1;
3212 send_rs = send_mld &&
3213 ipv6_accept_ra(ifp->idev) &&
1ec047eb 3214 ifp->idev->cnf.rtr_solicits > 0 &&
b173ee48 3215 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 3216 spin_unlock(&ifp->lock);
3217 read_unlock_bh(&ifp->idev->lock);
3218
b173ee48
HFS		 3219 /* While dad is in progress mld report's source address is in6_addrany.
3220 * Resend with proper ll now.
3221 */
3222 if (send_mld)
3223 ipv6_mc_dad_complete(ifp->idev);
3224
1ec047eb 3225 if (send_rs) {
1da177e4
LT		 3226 /*
3227 * If a host as already performed a random delay
3228 * [...] as part of DAD [...] there is no need
3229 * to delay again before sending the first RS
3230 */
1ec047eb 3231 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 3232 return;
1ec047eb 3233 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 3234
b7b1bfce
HFS		 3235 write_lock_bh(&ifp->idev->lock);
3236 spin_lock(&ifp->lock);
3237 ifp->idev->rs_probes = 1;
1da177e4 3238 ifp->idev->if_flags |= IF_RS_SENT;
b7b1bfce
HFS		 3239 addrconf_mod_rs_timer(ifp->idev,
3240 ifp->idev->cnf.rtr_solicit_interval);
3241 spin_unlock(&ifp->lock);
3242 write_unlock_bh(&ifp->idev->lock);
1da177e4
LT		 3243 }
3244}
3245
e21e8467
SH		 3246static void addrconf_dad_run(struct inet6_dev *idev)
3247{
c5e33bdd
YH		 3248 struct inet6_ifaddr *ifp;
3249
3250 read_lock_bh(&idev->lock);
502a2ffd 3251 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3252 spin_lock(&ifp->lock);
f2344a13
HX		 3253 if (ifp->flags & IFA_F_TENTATIVE &&
3254 ifp->state == INET6_IFADDR_STATE_DAD)
3255 addrconf_dad_kick(ifp);
21809faf 3256 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3257 }
3258 read_unlock_bh(&idev->lock);
3259}
3260
1da177e4
LT		 3261#ifdef CONFIG_PROC_FS
3262struct if6_iter_state {
3c40090a 3263 struct seq_net_private p;
1da177e4 3264 int bucket;
1d578303 3265 int offset;
1da177e4
LT		 3266};
3267
1d578303 3268static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3269{
3270 struct inet6_ifaddr *ifa = NULL;
3271 struct if6_iter_state *state = seq->private;
1218854a 3272 struct net *net = seq_file_net(seq);
1d578303 3273 int p = 0;
1da177e4 3274
1d578303
MM		 3275 /* initial bucket if pos is 0 */
3276 if (pos == 0) {
3277 state->bucket = 0;
3278 state->offset = 0;
3279 }
3280
3281 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3282 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3283 addr_lst) {
9f0d3c27
ED		 3284 if (!net_eq(dev_net(ifa->idev->dev), net))
3285 continue;
1d578303
MM		 3286 /* sync with offset */
3287 if (p < state->offset) {
3288 p++;
3289 continue;
3290 }
3291 state->offset++;
9f0d3c27 3292 return ifa;
1d578303
MM		 3293 }
3294
3295 /* prepare for next bucket */
3296 state->offset = 0;
3297 p = 0;
1da177e4 3298 }
c2e21293 3299 return NULL;
1da177e4
LT		 3300}
3301
c2e21293 3302static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3303 struct inet6_ifaddr *ifa)
1da177e4
LT		 3304{
3305 struct if6_iter_state *state = seq->private;
1218854a 3306 struct net *net = seq_file_net(seq);
1da177e4 3307
b67bfe0d 3308 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3309 if (!net_eq(dev_net(ifa->idev->dev), net))
3310 continue;
1d578303 3311 state->offset++;
9f0d3c27 3312 return ifa;
1d578303 3313 }
3c40090a 3314
c2e21293 3315 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3316 state->offset = 0;
b67bfe0d 3317 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3318 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3319 if (!net_eq(dev_net(ifa->idev->dev), net))
3320 continue;
1d578303 3321 state->offset++;
9f0d3c27 3322 return ifa;
c2e21293 3323 }
1da177e4 3324 }
3c40090a 3325
c2e21293 3326 return NULL;
1da177e4
LT		 3327}
3328
1da177e4 3329static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3330 __acquires(rcu_bh)
1da177e4 3331{
5c578aed 3332 rcu_read_lock_bh();
1d578303 3333 return if6_get_first(seq, *pos);
1da177e4
LT		 3334}
3335
3336static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3337{
3338 struct inet6_ifaddr *ifa;
3339
3340 ifa = if6_get_next(seq, v);
3341 ++*pos;
3342 return ifa;
3343}
3344
3345static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3346 __releases(rcu_bh)
1da177e4 3347{
5c578aed 3348 rcu_read_unlock_bh();
1da177e4
LT		 3349}
3350
3351static int if6_seq_show(struct seq_file *seq, void *v)
3352{
3353 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3354 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3355 &ifp->addr,
1da177e4
LT		 3356 ifp->idev->dev->ifindex,
3357 ifp->prefix_len,
3358 ifp->scope,
3359 ifp->flags,
3360 ifp->idev->dev->name);
3361 return 0;
3362}
3363
56b3d975 3364static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3365 .start = if6_seq_start,
3366 .next = if6_seq_next,
3367 .show = if6_seq_show,
3368 .stop = if6_seq_stop,
3369};
3370
3371static int if6_seq_open(struct inode *inode, struct file *file)
3372{
3c40090a
DL		 3373 return seq_open_net(inode, file, &if6_seq_ops,
3374 sizeof(struct if6_iter_state));
1da177e4
LT		 3375}
3376
9a32144e 3377static const struct file_operations if6_fops = {
1da177e4
LT		 3378 .owner = THIS_MODULE,
3379 .open = if6_seq_open,
3380 .read = seq_read,
3381 .llseek = seq_lseek,
3c40090a 3382 .release = seq_release_net,
1da177e4
LT		 3383};
3384
2c8c1e72 3385static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3386{
d4beaa66 3387 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 3388 return -ENOMEM;
3389 return 0;
3390}
3391
2c8c1e72 3392static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 3393{
ece31ffd 3394 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 3395}
3396
3397static struct pernet_operations if6_proc_net_ops = {
3398 .init = if6_proc_net_init,
3399 .exit = if6_proc_net_exit,
3400};
3401
3402int __init if6_proc_init(void)
3403{
3404 return register_pernet_subsys(&if6_proc_net_ops);
3405}
3406
1da177e4
LT		 3407void if6_proc_exit(void)
3408{
3c40090a 3409 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3410}
3411#endif /* CONFIG_PROC_FS */
3412
07a93626 3413#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3414/* Check if address is a home address configured on any interface. */
b71d1d42 3415int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3416{
3417 int ret = 0;
c2e21293 3418 struct inet6_ifaddr *ifp = NULL;
ddbe5032 3419 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3420
5c578aed 3421 rcu_read_lock_bh();
b67bfe0d 3422 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 3423 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3424 continue;
caad295f 3425 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3426 (ifp->flags & IFA_F_HOMEADDRESS)) {
3427 ret = 1;
3428 break;
3429 }
3430 }
5c578aed 3431 rcu_read_unlock_bh();
3b9f9a1c
NT		 3432 return ret;
3433}
3434#endif
3435
1da177e4
LT		 3436/*
3437 * Periodic address status verification
3438 */
3439
3440static void addrconf_verify(unsigned long foo)
3441{
b2db7564 3442 unsigned long now, next, next_sec, next_sched;
1da177e4 3443 struct inet6_ifaddr *ifp;
1da177e4
LT		 3444 int i;
3445
5c578aed 3446 rcu_read_lock_bh();
3447 spin_lock(&addrconf_verify_lock);
1da177e4 3448 now = jiffies;
b2db7564 3449 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4
LT		 3450
3451 del_timer(&addr_chk_timer);
3452
bcdd553f 3453 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3454restart:
b67bfe0d 3455 hlist_for_each_entry_rcu_bh(ifp,
5c578aed 3456 &inet6_addr_lst[i], addr_lst) {
1da177e4 3457 unsigned long age;
1da177e4
LT		 3458
3459 if (ifp->flags & IFA_F_PERMANENT)
3460 continue;
3461
3462 spin_lock(&ifp->lock);
b2db7564
YH		 3463 /* We try to batch several events at once. */
3464 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3465
8f27ebb9
YH		 3466 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3467 age >= ifp->valid_lft) {
1da177e4
LT		 3468 spin_unlock(&ifp->lock);
3469 in6_ifa_hold(ifp);
1da177e4
LT		 3470 ipv6_del_addr(ifp);
3471 goto restart;
8f27ebb9
YH		 3472 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3473 spin_unlock(&ifp->lock);
3474 continue;
1da177e4 3475 } else if (age >= ifp->prefered_lft) {
a1ed0526 3476 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3477 int deprecate = 0;
3478
3479 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3480 deprecate = 1;
3481 ifp->flags |= IFA_F_DEPRECATED;
3482 }
3483
3484 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3485 next = ifp->tstamp + ifp->valid_lft * HZ;
3486
3487 spin_unlock(&ifp->lock);
3488
3489 if (deprecate) {
3490 in6_ifa_hold(ifp);
1da177e4
LT		 3491
3492 ipv6_ifa_notify(0, ifp);
3493 in6_ifa_put(ifp);
3494 goto restart;
3495 }
1da177e4
LT		 3496 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3497 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3498 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3499 ifp->idev->cnf.dad_transmits *
3500 ifp->idev->nd_parms->retrans_time / HZ;
3501
1da177e4
LT		 3502 if (age >= ifp->prefered_lft - regen_advance) {
3503 struct inet6_ifaddr *ifpub = ifp->ifpub;
3504 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3505 next = ifp->tstamp + ifp->prefered_lft * HZ;
3506 if (!ifp->regen_count && ifpub) {
3507 ifp->regen_count++;
3508 in6_ifa_hold(ifp);
3509 in6_ifa_hold(ifpub);
3510 spin_unlock(&ifp->lock);
5c578aed 3511
291d809b
HY		 3512 spin_lock(&ifpub->lock);
3513 ifpub->regen_count = 0;
3514 spin_unlock(&ifpub->lock);
1da177e4
LT		 3515 ipv6_create_tempaddr(ifpub, ifp);
3516 in6_ifa_put(ifpub);
3517 in6_ifa_put(ifp);
3518 goto restart;
3519 }
3520 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3521 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3522 spin_unlock(&ifp->lock);
1da177e4
LT		 3523 } else {
3524 /* ifp->prefered_lft <= ifp->valid_lft */
3525 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3526 next = ifp->tstamp + ifp->prefered_lft * HZ;
3527 spin_unlock(&ifp->lock);
3528 }
3529 }
1da177e4
LT		 3530 }
3531
b2db7564
YH		 3532 next_sec = round_jiffies_up(next);
3533 next_sched = next;
3534
3535 /* If rounded timeout is accurate enough, accept it. */
3536 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3537 next_sched = next_sec;
3538
3539 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3540 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3541 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3542
ba3542e1 3543 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3544 now, next, next_sec, next_sched);
b2db7564
YH		 3545
3546 addr_chk_timer.expires = next_sched;
1da177e4 3547 add_timer(&addr_chk_timer);
5c578aed 3548 spin_unlock(&addrconf_verify_lock);
3549 rcu_read_unlock_bh();
1da177e4
LT		 3550}
3551
caeaba79
ND		 3552static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3553 struct in6_addr **peer_pfx)
461d8837
TG		 3554{
3555 struct in6_addr *pfx = NULL;
3556
caeaba79
ND		 3557 *peer_pfx = NULL;
3558
461d8837
TG		 3559 if (addr)
3560 pfx = nla_data(addr);
3561
3562 if (local) {
3563 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 3564 *peer_pfx = pfx;
3565 pfx = nla_data(local);
461d8837
TG		 3566 }
3567
3568 return pfx;
3569}
3570
ef7c79ed 3571static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3572 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3573 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3574 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3575};
3576
1da177e4 3577static int
661d2967 3578inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3579{
3b1e0a65 3580 struct net *net = sock_net(skb->sk);
b933f716
TG		 3581 struct ifaddrmsg *ifm;
3582 struct nlattr *tb[IFA_MAX+1];
caeaba79 3583 struct in6_addr *pfx, *peer_pfx;
b933f716 3584 int err;
1da177e4 3585
b933f716
TG		 3586 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3587 if (err < 0)
3588 return err;
3589
3590 ifm = nlmsg_data(nlh);
caeaba79 3591 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3592 if (pfx == NULL)
3593 return -EINVAL;
3594
af284937 3595 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3596}
3597
55ebaef1
NT		 3598static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3599 u32 prefered_lft, u32 valid_lft)
081bba5b 3600{
6f704992
YH		 3601 u32 flags;
3602 clock_t expires;
4bed72e4 3603 unsigned long timeout;
46d48046 3604
081bba5b
NT		 3605 if (!valid_lft || (prefered_lft > valid_lft))
3606 return -EINVAL;
3607
4bed72e4
YH		 3608 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3609 if (addrconf_finite_timeout(timeout)) {
3610 expires = jiffies_to_clock_t(timeout * HZ);
3611 valid_lft = timeout;
6f704992 3612 flags = RTF_EXPIRES;
4bed72e4
YH		 3613 } else {
3614 expires = 0;
3615 flags = 0;
3616 ifa_flags |= IFA_F_PERMANENT;
6f704992 3617 }
081bba5b 3618
4bed72e4
YH		 3619 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3620 if (addrconf_finite_timeout(timeout)) {
3621 if (timeout == 0)
3622 ifa_flags |= IFA_F_DEPRECATED;
3623 prefered_lft = timeout;
3624 }
081bba5b
NT		 3625
3626 spin_lock_bh(&ifp->lock);
3b9f9a1c 3627 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3628 ifp->tstamp = jiffies;
3629 ifp->valid_lft = valid_lft;
3630 ifp->prefered_lft = prefered_lft;
3631
3632 spin_unlock_bh(&ifp->lock);
3633 if (!(ifp->flags&IFA_F_TENTATIVE))
3634 ipv6_ifa_notify(0, ifp);
081bba5b 3635
46d48046 3636 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3637 expires, flags);
081bba5b
NT		 3638 addrconf_verify(0);
3639
3640 return 0;
3641}
3642
1da177e4 3643static int
661d2967 3644inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3645{
3b1e0a65 3646 struct net *net = sock_net(skb->sk);
461d8837
TG		 3647 struct ifaddrmsg *ifm;
3648 struct nlattr *tb[IFA_MAX+1];
caeaba79 3649 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 3650 struct inet6_ifaddr *ifa;
3651 struct net_device *dev;
55ebaef1
NT		 3652 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3653 u8 ifa_flags;
461d8837 3654 int err;
1da177e4 3655
461d8837
TG		 3656 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3657 if (err < 0)
3658 return err;
3659
3660 ifm = nlmsg_data(nlh);
caeaba79 3661 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3662 if (pfx == NULL)
3663 return -EINVAL;
3664
461d8837 3665 if (tb[IFA_CACHEINFO]) {
0778769d 3666 struct ifa_cacheinfo *ci;
461d8837
TG		 3667
3668 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3669 valid_lft = ci->ifa_valid;
461d8837
TG		 3670 preferred_lft = ci->ifa_prefered;
3671 } else {
3672 preferred_lft = INFINITY_LIFE_TIME;
3673 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3674 }
3675
af284937 3676 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3677 if (dev == NULL)
3678 return -ENODEV;
3679
55ebaef1 3680 /* We ignore other flags so far. */
3b9f9a1c 3681 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3682
1cab3da6 3683 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3684 if (ifa == NULL) {
3685 /*
3686 * It would be best to check for !NLM_F_CREATE here but
3687 * userspace alreay relies on not having to provide this.
3688 */
caeaba79 3689 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 3690 ifm->ifa_prefixlen, ifa_flags,
3691 preferred_lft, valid_lft);
081bba5b
NT		 3692 }
3693
7198f8ce
TG		 3694 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3695 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3696 err = -EEXIST;
3697 else
55ebaef1 3698 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3699
3700 in6_ifa_put(ifa);
3701
3702 return err;
1da177e4
LT		 3703}
3704
101bb229
TG		 3705static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3706 u8 scope, int ifindex)
3707{
3708 struct ifaddrmsg *ifm;
3709
3710 ifm = nlmsg_data(nlh);
3711 ifm->ifa_family = AF_INET6;
3712 ifm->ifa_prefixlen = prefixlen;
3713 ifm->ifa_flags = flags;
3714 ifm->ifa_scope = scope;
3715 ifm->ifa_index = ifindex;
3716}
3717
85486af0
TG		 3718static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3719 unsigned long tstamp, u32 preferred, u32 valid)
3720{
3721 struct ifa_cacheinfo ci;
3722
18a31e1e
TG		 3723 ci.cstamp = cstamp_delta(cstamp);
3724 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 3725 ci.ifa_prefered = preferred;
3726 ci.ifa_valid = valid;
3727
3728 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3729}
3730
101bb229
TG		 3731static inline int rt_scope(int ifa_scope)
3732{
3733 if (ifa_scope & IFA_HOST)
3734 return RT_SCOPE_HOST;
3735 else if (ifa_scope & IFA_LINK)
3736 return RT_SCOPE_LINK;
3737 else if (ifa_scope & IFA_SITE)
3738 return RT_SCOPE_SITE;
3739 else
3740 return RT_SCOPE_UNIVERSE;
3741}
3742
0ab6803b
TG		 3743static inline int inet6_ifaddr_msgsize(void)
3744{
339bf98f 3745 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 3746 + nla_total_size(16) /* IFA_LOCAL */
339bf98f
TG		 3747 + nla_total_size(16) /* IFA_ADDRESS */
3748 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3749}
c5396a31 3750
1da177e4 3751static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 3752 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3753{
1da177e4 3754 struct nlmsghdr *nlh;
85486af0 3755 u32 preferred, valid;
1da177e4 3756
15e47304 3757 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3758 if (nlh == NULL)
26932566 3759 return -EMSGSIZE;
0ab6803b 3760
101bb229
TG		 3761 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3762 ifa->idev->dev->ifindex);
3763
1da177e4 3764 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3765 preferred = ifa->prefered_lft;
3766 valid = ifa->valid_lft;
3767 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3768 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3769 if (preferred > tval)
3770 preferred -= tval;
3771 else
3772 preferred = 0;
f56619fc
BH		 3773 if (valid != INFINITY_LIFE_TIME) {
3774 if (valid > tval)
3775 valid -= tval;
3776 else
3777 valid = 0;
3778 }
1da177e4
LT		 3779 }
3780 } else {
85486af0
TG		 3781 preferred = INFINITY_LIFE_TIME;
3782 valid = INFINITY_LIFE_TIME;
3783 }
3784
7996c799 3785 if (!ipv6_addr_any(&ifa->peer_addr)) {
caeaba79
ND		 3786 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3787 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3788 goto error;
3789 } else
3790 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3791 goto error;
3792
3793 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3794 goto error;
1da177e4 3795
0ab6803b 3796 return nlmsg_end(skb, nlh);
caeaba79
ND		 3797
3798error:
3799 nlmsg_cancel(skb, nlh);
3800 return -EMSGSIZE;
1da177e4
LT		 3801}
3802
3803static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 3804 u32 portid, u32 seq, int event, u16 flags)
1da177e4 3805{
1da177e4 3806 struct nlmsghdr *nlh;
101bb229
TG		 3807 u8 scope = RT_SCOPE_UNIVERSE;
3808 int ifindex = ifmca->idev->dev->ifindex;
3809
3810 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3811 scope = RT_SCOPE_SITE;
1da177e4 3812
15e47304 3813 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3814 if (nlh == NULL)
26932566 3815 return -EMSGSIZE;
85486af0 3816
0ab6803b
TG		 3817 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3818 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3819 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3820 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3821 nlmsg_cancel(skb, nlh);
3822 return -EMSGSIZE;
3823 }
85486af0 3824
0ab6803b 3825 return nlmsg_end(skb, nlh);
1da177e4
LT		 3826}
3827
3828static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 3829 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3830{
1da177e4 3831 struct nlmsghdr *nlh;
101bb229
TG		 3832 u8 scope = RT_SCOPE_UNIVERSE;
3833 int ifindex = ifaca->aca_idev->dev->ifindex;
3834
3835 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3836 scope = RT_SCOPE_SITE;
1da177e4 3837
15e47304 3838 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3839 if (nlh == NULL)
26932566 3840 return -EMSGSIZE;
85486af0 3841
0ab6803b
TG		 3842 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3843 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3844 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3845 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3846 nlmsg_cancel(skb, nlh);
3847 return -EMSGSIZE;
3848 }
1da177e4 3849
0ab6803b 3850 return nlmsg_end(skb, nlh);
1da177e4
LT		 3851}
3852
e21e8467 3853enum addr_type_t {
1da177e4
LT		 3854 UNICAST_ADDR,
3855 MULTICAST_ADDR,
3856 ANYCAST_ADDR,
3857};
3858
234b27c3
ED		 3859/* called with rcu_read_lock() */
3860static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3861 struct netlink_callback *cb, enum addr_type_t type,
3862 int s_ip_idx, int *p_ip_idx)
3863{
234b27c3
ED		 3864 struct ifmcaddr6 *ifmca;
3865 struct ifacaddr6 *ifaca;
3866 int err = 1;
3867 int ip_idx = *p_ip_idx;
3868
3869 read_lock_bh(&idev->lock);
3870 switch (type) {
502a2ffd 3871 case UNICAST_ADDR: {
3872 struct inet6_ifaddr *ifa;
3873
234b27c3 3874 /* unicast address incl. temp addr */
502a2ffd 3875 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3876 if (++ip_idx < s_ip_idx)
234b27c3
ED		 3877 continue;
3878 err = inet6_fill_ifaddr(skb, ifa,
15e47304 3879 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3880 cb->nlh->nlmsg_seq,
3881 RTM_NEWADDR,
3882 NLM_F_MULTI);
3883 if (err <= 0)
3884 break;
63998ac2 3885 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 3886 }
3887 break;
502a2ffd 3888 }
234b27c3
ED		 3889 case MULTICAST_ADDR:
3890 /* multicast address */
3891 for (ifmca = idev->mc_list; ifmca;
3892 ifmca = ifmca->next, ip_idx++) {
3893 if (ip_idx < s_ip_idx)
3894 continue;
3895 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 3896 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3897 cb->nlh->nlmsg_seq,
3898 RTM_GETMULTICAST,
3899 NLM_F_MULTI);
3900 if (err <= 0)
3901 break;
3902 }
3903 break;
3904 case ANYCAST_ADDR:
3905 /* anycast address */
3906 for (ifaca = idev->ac_list; ifaca;
3907 ifaca = ifaca->aca_next, ip_idx++) {
3908 if (ip_idx < s_ip_idx)
3909 continue;
3910 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 3911 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3912 cb->nlh->nlmsg_seq,
3913 RTM_GETANYCAST,
3914 NLM_F_MULTI);
3915 if (err <= 0)
3916 break;
3917 }
3918 break;
3919 default:
3920 break;
3921 }
3922 read_unlock_bh(&idev->lock);
3923 *p_ip_idx = ip_idx;
3924 return err;
3925}
3926
1da177e4
LT		 3927static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3928 enum addr_type_t type)
3929{
234b27c3
ED		 3930 struct net *net = sock_net(skb->sk);
3931 int h, s_h;
1da177e4
LT		 3932 int idx, ip_idx;
3933 int s_idx, s_ip_idx;
1da177e4 3934 struct net_device *dev;
234b27c3
ED		 3935 struct inet6_dev *idev;
3936 struct hlist_head *head;
1ab1457c 3937
234b27c3
ED		 3938 s_h = cb->args[0];
3939 s_idx = idx = cb->args[1];
3940 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 3941
234b27c3 3942 rcu_read_lock();
63998ac2 3943 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 3944 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3945 idx = 0;
3946 head = &net->dev_index_head[h];
b67bfe0d 3947 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 3948 if (idx < s_idx)
3949 goto cont;
4b97efdf 3950 if (h > s_h || idx > s_idx)
234b27c3
ED		 3951 s_ip_idx = 0;
3952 ip_idx = 0;
e21e8467
SH		 3953 idev = __in6_dev_get(dev);
3954 if (!idev)
234b27c3
ED		 3955 goto cont;
3956
3957 if (in6_dump_addrs(idev, skb, cb, type,
3958 s_ip_idx, &ip_idx) <= 0)
3959 goto done;
7562f876 3960cont:
234b27c3
ED		 3961 idx++;
3962 }
1da177e4 3963 }
234b27c3
ED		 3964done:
3965 rcu_read_unlock();
3966 cb->args[0] = h;
3967 cb->args[1] = idx;
3968 cb->args[2] = ip_idx;
3969
1da177e4
LT		 3970 return skb->len;
3971}
3972
3973static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3974{
3975 enum addr_type_t type = UNICAST_ADDR;
b854272b 3976
1da177e4
LT		 3977 return inet6_dump_addr(skb, cb, type);
3978}
3979
3980static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3981{
3982 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3983
1da177e4
LT		 3984 return inet6_dump_addr(skb, cb, type);
3985}
3986
3987
3988static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3989{
3990 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3991
1da177e4
LT		 3992 return inet6_dump_addr(skb, cb, type);
3993}
3994
661d2967 3995static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 3996{
3b1e0a65 3997 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3998 struct ifaddrmsg *ifm;
3999 struct nlattr *tb[IFA_MAX+1];
caeaba79 4000 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4001 struct net_device *dev = NULL;
4002 struct inet6_ifaddr *ifa;
4003 struct sk_buff *skb;
6c223828
NT		 4004 int err;
4005
1b29fc2c
TG		 4006 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4007 if (err < 0)
4008 goto errout;
4009
caeaba79 4010 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
1b29fc2c
TG		 4011 if (addr == NULL) {
4012 err = -EINVAL;
4013 goto errout;
6c223828 4014 }
6c223828 4015
1b29fc2c 4016 ifm = nlmsg_data(nlh);
6c223828 4017 if (ifm->ifa_index)
6fda7350 4018 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4019
e21e8467
SH		 4020 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4021 if (!ifa) {
1b29fc2c
TG		 4022 err = -EADDRNOTAVAIL;
4023 goto errout;
4024 }
6c223828 4025
e21e8467
SH		 4026 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4027 if (!skb) {
6c223828 4028 err = -ENOBUFS;
1b29fc2c 4029 goto errout_ifa;
6c223828
NT		 4030 }
4031
15e47304 4032 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4033 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4034 if (err < 0) {
4035 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4036 WARN_ON(err == -EMSGSIZE);
4037 kfree_skb(skb);
4038 goto errout_ifa;
4039 }
15e47304 4040 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4041errout_ifa:
6c223828 4042 in6_ifa_put(ifa);
1b29fc2c 4043errout:
6c223828 4044 return err;
6c223828
NT		 4045}
4046
1da177e4
LT		 4047static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4048{
4049 struct sk_buff *skb;
c346dca1 4050 struct net *net = dev_net(ifa->idev->dev);
5d620266 4051 int err = -ENOBUFS;
1da177e4 4052
0ab6803b 4053 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 4054 if (skb == NULL)
4055 goto errout;
4056
4057 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4058 if (err < 0) {
4059 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4060 WARN_ON(err == -EMSGSIZE);
4061 kfree_skb(skb);
4062 goto errout;
4063 }
1ce85fe4
PNA		 4064 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4065 return;
5d620266
TG		 4066errout:
4067 if (err < 0)
6fda7350 4068 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4069}
4070
b6f99a21 4071static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4072 __s32 *array, int bytes)
4073{
04561c1f
TG		 4074 BUG_ON(bytes < (DEVCONF_MAX * 4));
4075
1da177e4
LT		 4076 memset(array, 0, bytes);
4077 array[DEVCONF_FORWARDING] = cnf->forwarding;
4078 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4079 array[DEVCONF_MTU6] = cnf->mtu6;
4080 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4081 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4082 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4083 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4084 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4085 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4086 jiffies_to_msecs(cnf->rtr_solicit_interval);
4087 array[DEVCONF_RTR_SOLICIT_DELAY] =
4088 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4089 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4090 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4091 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4092 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4093 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4094 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4095 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4096 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4097 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4098 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4099 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4100 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 4101 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4102#ifdef CONFIG_IPV6_ROUTER_PREF
4103 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4104 array[DEVCONF_RTR_PROBE_INTERVAL] =
4105 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4106#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4107 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4108#endif
930d6ff2 4109#endif
fbea49e1 4110 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4111 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4112#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4113 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4114#endif
7bc570c8
YH		 4115#ifdef CONFIG_IPV6_MROUTE
4116 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4117#endif
778d80be 4118 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4119 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4120 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4121 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 4122 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
1da177e4
LT		 4123}
4124
b382b191
TG		 4125static inline size_t inet6_ifla6_size(void)
4126{
4127 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4128 + nla_total_size(sizeof(struct ifla_cacheinfo))
4129 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4130 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4131 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4132 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4133}
4134
339bf98f
TG		 4135static inline size_t inet6_if_nlmsg_size(void)
4136{
4137 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4138 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4139 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4140 + nla_total_size(4) /* IFLA_MTU */
4141 + nla_total_size(4) /* IFLA_LINK */
b382b191 4142 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4143}
c5396a31 4144
be281e55 4145static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4146 int items, int bytes)
7f7d9a6b
HX		 4147{
4148 int i;
4149 int pad = bytes - sizeof(u64) * items;
4150 BUG_ON(pad < 0);
4151
4152 /* Use put_unaligned() because stats may not be aligned for u64. */
4153 put_unaligned(items, &stats[0]);
4154 for (i = 1; i < items; i++)
be281e55 4155 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4156
4157 memset(&stats[items], 0, pad);
4158}
4159
4ce3c183
ED		 4160static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4161 int items, int bytes, size_t syncpoff)
4162{
4163 int i;
4164 int pad = bytes - sizeof(u64) * items;
4165 BUG_ON(pad < 0);
4166
4167 /* Use put_unaligned() because stats may not be aligned for u64. */
4168 put_unaligned(items, &stats[0]);
4169 for (i = 1; i < items; i++)
4170 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4171
4172 memset(&stats[items], 0, pad);
4173}
4174
7f7d9a6b
HX		 4175static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4176 int bytes)
4177{
e21e8467 4178 switch (attrtype) {
7f7d9a6b 4179 case IFLA_INET6_STATS:
4ce3c183
ED		 4180 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4181 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4182 break;
4183 case IFLA_INET6_ICMP6STATS:
be281e55 4184 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4185 break;
4186 }
4187}
4188
b382b191
TG		 4189static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4190{
4191 struct nlattr *nla;
4192 struct ifla_cacheinfo ci;
4193
c78679e8
DM		 4194 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4195 goto nla_put_failure;
b382b191 4196 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4197 ci.tstamp = cstamp_delta(idev->tstamp);
4198 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4199 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
c78679e8
DM		 4200 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4201 goto nla_put_failure;
b382b191
TG		 4202 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4203 if (nla == NULL)
4204 goto nla_put_failure;
4205 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4206
4207 /* XXX - MC not implemented */
4208
4209 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4210 if (nla == NULL)
4211 goto nla_put_failure;
4212 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4213
4214 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4215 if (nla == NULL)
4216 goto nla_put_failure;
4217 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4218
f53adae4
DB		 4219 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4220 if (nla == NULL)
4221 goto nla_put_failure;
4222 read_lock_bh(&idev->lock);
4223 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4224 read_unlock_bh(&idev->lock);
4225
b382b191
TG		 4226 return 0;
4227
4228nla_put_failure:
4229 return -EMSGSIZE;
4230}
4231
4232static size_t inet6_get_link_af_size(const struct net_device *dev)
4233{
4234 if (!__in6_dev_get(dev))
4235 return 0;
4236
4237 return inet6_ifla6_size();
4238}
4239
4240static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4241{
4242 struct inet6_dev *idev = __in6_dev_get(dev);
4243
4244 if (!idev)
4245 return -ENODATA;
4246
4247 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4248 return -EMSGSIZE;
4249
4250 return 0;
4251}
4252
f53adae4
DB		 4253static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4254{
f53adae4
DB		 4255 struct inet6_ifaddr *ifp;
4256 struct net_device *dev = idev->dev;
fc403832 4257 bool update_rs = false;
dc848292 4258 struct in6_addr ll_addr;
f53adae4
DB		 4259
4260 if (token == NULL)
4261 return -EINVAL;
4262 if (ipv6_addr_any(token))
4263 return -EINVAL;
4264 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4265 return -EINVAL;
f53adae4
DB		 4266 if (!ipv6_accept_ra(idev))
4267 return -EINVAL;
4268 if (idev->cnf.rtr_solicits <= 0)
4269 return -EINVAL;
4270
4271 write_lock_bh(&idev->lock);
4272
4273 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4274 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4275
4276 write_unlock_bh(&idev->lock);
4277
dc848292
HFS		 4278 if (!idev->dead && (idev->if_flags & IF_READY) &&
4279 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4280 IFA_F_OPTIMISTIC)) {
fc403832
DB		 4281
4282 /* If we're not ready, then normal ifup will take care
4283 * of this. Otherwise, we need to request our rs here.
4284 */
4285 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4286 update_rs = true;
4287 }
f53adae4
DB		 4288
4289 write_lock_bh(&idev->lock);
fc403832 4290
77ecaace 4291 if (update_rs) {
fc403832 4292 idev->if_flags |= IF_RS_SENT;
77ecaace
HFS		 4293 idev->rs_probes = 1;
4294 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4295 }
f53adae4
DB		 4296
4297 /* Well, that's kinda nasty ... */
4298 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4299 spin_lock(&ifp->lock);
617fe29d 4300 if (ifp->tokenized) {
f53adae4
DB		 4301 ifp->valid_lft = 0;
4302 ifp->prefered_lft = 0;
4303 }
4304 spin_unlock(&ifp->lock);
4305 }
4306
4307 write_unlock_bh(&idev->lock);
2b9651d7 4308 addrconf_verify(0);
f53adae4
DB		 4309 return 0;
4310}
4311
4312static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4313{
4314 int err = -EINVAL;
4315 struct inet6_dev *idev = __in6_dev_get(dev);
4316 struct nlattr *tb[IFLA_INET6_MAX + 1];
4317
4318 if (!idev)
4319 return -EAFNOSUPPORT;
4320
4321 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4322 BUG();
4323
4324 if (tb[IFLA_INET6_TOKEN])
4325 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4326
4327 return err;
4328}
4329
1ab1457c 4330static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4331 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4332{
04561c1f 4333 struct net_device *dev = idev->dev;
04561c1f
TG		 4334 struct ifinfomsg *hdr;
4335 struct nlmsghdr *nlh;
4336 void *protoinfo;
04561c1f 4337
15e47304 4338 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
04561c1f 4339 if (nlh == NULL)
26932566 4340 return -EMSGSIZE;
04561c1f
TG		 4341
4342 hdr = nlmsg_data(nlh);
4343 hdr->ifi_family = AF_INET6;
4344 hdr->__ifi_pad = 0;
4345 hdr->ifi_type = dev->type;
4346 hdr->ifi_index = dev->ifindex;
4347 hdr->ifi_flags = dev_get_flags(dev);
4348 hdr->ifi_change = 0;
4349
c78679e8
DM		 4350 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4351 (dev->addr_len &&
4352 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4353 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4354 (dev->ifindex != dev->iflink &&
4355 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4356 goto nla_put_failure;
04561c1f
TG		 4357 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4358 if (protoinfo == NULL)
4359 goto nla_put_failure;
1da177e4 4360
b382b191 4361 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4362 goto nla_put_failure;
1da177e4 4363
04561c1f
TG		 4364 nla_nest_end(skb, protoinfo);
4365 return nlmsg_end(skb, nlh);
1da177e4 4366
04561c1f 4367nla_put_failure:
26932566
PM		 4368 nlmsg_cancel(skb, nlh);
4369 return -EMSGSIZE;
1da177e4
LT		 4370}
4371
4372static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4373{
3b1e0a65 4374 struct net *net = sock_net(skb->sk);
84d2697d 4375 int h, s_h;
434a8a58 4376 int idx = 0, s_idx;
1da177e4
LT		 4377 struct net_device *dev;
4378 struct inet6_dev *idev;
84d2697d 4379 struct hlist_head *head;
1da177e4 4380
84d2697d
ED		 4381 s_h = cb->args[0];
4382 s_idx = cb->args[1];
4383
4384 rcu_read_lock();
4385 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4386 idx = 0;
4387 head = &net->dev_index_head[h];
b67bfe0d 4388 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 4389 if (idx < s_idx)
4390 goto cont;
4391 idev = __in6_dev_get(dev);
4392 if (!idev)
4393 goto cont;
4394 if (inet6_fill_ifinfo(skb, idev,
15e47304 4395 NETLINK_CB(cb->skb).portid,
84d2697d
ED		 4396 cb->nlh->nlmsg_seq,
4397 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4398 goto out;
7562f876 4399cont:
84d2697d
ED		 4400 idx++;
4401 }
1da177e4 4402 }
84d2697d
ED		 4403out:
4404 rcu_read_unlock();
4405 cb->args[1] = idx;
4406 cb->args[0] = h;
1da177e4
LT		 4407
4408 return skb->len;
4409}
4410
4411void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4412{
4413 struct sk_buff *skb;
c346dca1 4414 struct net *net = dev_net(idev->dev);
8d7a76c9 4415 int err = -ENOBUFS;
1ab1457c 4416
339bf98f 4417 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4418 if (skb == NULL)
4419 goto errout;
4420
4421 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4422 if (err < 0) {
4423 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4424 WARN_ON(err == -EMSGSIZE);
4425 kfree_skb(skb);
4426 goto errout;
4427 }
5f75a104 4428 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4429 return;
8d7a76c9
TG		 4430errout:
4431 if (err < 0)
5f75a104 4432 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4433}
4434
339bf98f
TG		 4435static inline size_t inet6_prefix_nlmsg_size(void)
4436{
4437 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4438 + nla_total_size(sizeof(struct in6_addr))
4439 + nla_total_size(sizeof(struct prefix_cacheinfo));
4440}
c5396a31 4441
1da177e4 4442static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4443 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 4444 int event, unsigned int flags)
1da177e4 4445{
6051e2f4
TG		 4446 struct prefixmsg *pmsg;
4447 struct nlmsghdr *nlh;
1da177e4
LT		 4448 struct prefix_cacheinfo ci;
4449
15e47304 4450 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6051e2f4 4451 if (nlh == NULL)
26932566 4452 return -EMSGSIZE;
6051e2f4
TG		 4453
4454 pmsg = nlmsg_data(nlh);
1da177e4 4455 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4456 pmsg->prefix_pad1 = 0;
4457 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4458 pmsg->prefix_ifindex = idev->dev->ifindex;
4459 pmsg->prefix_len = pinfo->prefix_len;
4460 pmsg->prefix_type = pinfo->type;
8a47077a 4461 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4462 pmsg->prefix_flags = 0;
4463 if (pinfo->onlink)
4464 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4465 if (pinfo->autoconf)
4466 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4467
c78679e8
DM		 4468 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4469 goto nla_put_failure;
1da177e4
LT		 4470 ci.preferred_time = ntohl(pinfo->prefered);
4471 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 4472 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4473 goto nla_put_failure;
6051e2f4 4474 return nlmsg_end(skb, nlh);
1da177e4 4475
6051e2f4 4476nla_put_failure:
26932566
PM		 4477 nlmsg_cancel(skb, nlh);
4478 return -EMSGSIZE;
1da177e4
LT		 4479}
4480
1ab1457c 4481static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4482 struct prefix_info *pinfo)
4483{
4484 struct sk_buff *skb;
c346dca1 4485 struct net *net = dev_net(idev->dev);
8c384bfa 4486 int err = -ENOBUFS;
1da177e4 4487
339bf98f 4488 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4489 if (skb == NULL)
4490 goto errout;
4491
4492 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4493 if (err < 0) {
4494 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4495 WARN_ON(err == -EMSGSIZE);
4496 kfree_skb(skb);
4497 goto errout;
4498 }
1ce85fe4
PNA		 4499 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4500 return;
8c384bfa
TG		 4501errout:
4502 if (err < 0)
6fda7350 4503 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4504}
4505
1ec047eb
HFS		 4506static void update_valid_ll_addr_cnt(struct inet6_ifaddr *ifp, int count)
4507{
4508 write_lock_bh(&ifp->idev->lock);
4509 spin_lock(&ifp->lock);
4510 if (((ifp->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|
4511 IFA_F_DADFAILED)) == IFA_F_PERMANENT) &&
4512 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL))
4513 ifp->idev->valid_ll_addr_cnt += count;
4514 WARN_ON(ifp->idev->valid_ll_addr_cnt < 0);
4515 spin_unlock(&ifp->lock);
4516 write_unlock_bh(&ifp->idev->lock);
4517}
4518
1da177e4
LT		 4519static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4520{
63998ac2
ND		 4521 struct net *net = dev_net(ifp->idev->dev);
4522
1da177e4
LT		 4523 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4524
4525 switch (event) {
4526 case RTM_NEWADDR:
1ec047eb
HFS		 4527 update_valid_ll_addr_cnt(ifp, 1);
4528
95c385b4
NH		 4529 /*
4530 * If the address was optimistic
4531 * we inserted the route at the start of
4532 * our DAD process, so we don't need
4533 * to do it again
4534 */
4535 if (!(ifp->rt->rt6i_node))
4536 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4537 if (ifp->idev->cnf.forwarding)
4538 addrconf_join_anycast(ifp);
7996c799 4539 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 4540 addrconf_prefix_route(&ifp->peer_addr, 128,
4541 ifp->idev->dev, 0, 0);
1da177e4
LT		 4542 break;
4543 case RTM_DELADDR:
1ec047eb
HFS		 4544 update_valid_ll_addr_cnt(ifp, -1);
4545
1da177e4
LT		 4546 if (ifp->idev->cnf.forwarding)
4547 addrconf_leave_anycast(ifp);
4548 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 4549 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79
ND		 4550 struct rt6_info *rt;
4551 struct net_device *dev = ifp->idev->dev;
4552
4553 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4554 dev->ifindex, 1);
4555 if (rt) {
4556 dst_hold(&rt->dst);
4557 if (ip6_del_rt(rt))
4558 dst_free(&rt->dst);
4559 }
4560 }
d8d1f30b 4561 dst_hold(&ifp->rt->dst);
93fa159a 4562
73a8bd74 4563 if (ip6_del_rt(ifp->rt))
d8d1f30b 4564 dst_free(&ifp->rt->dst);
1da177e4
LT		 4565 break;
4566 }
63998ac2 4567 atomic_inc(&net->ipv6.dev_addr_genid);
439677d7 4568 rt_genid_bump_ipv6(net);
1da177e4
LT		 4569}
4570
4571static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4572{
8814c4b5 4573 rcu_read_lock_bh();
1da177e4
LT		 4574 if (likely(ifp->idev->dead == 0))
4575 __ipv6_ifa_notify(event, ifp);
8814c4b5 4576 rcu_read_unlock_bh();
1da177e4
LT		 4577}
4578
4579#ifdef CONFIG_SYSCTL
4580
4581static
fe2c6338 4582int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 4583 void __user *buffer, size_t *lenp, loff_t *ppos)
4584{
4585 int *valp = ctl->data;
4586 int val = *valp;
88af182e 4587 loff_t pos = *ppos;
fe2c6338 4588 struct ctl_table lctl;
1da177e4
LT		 4589 int ret;
4590
013d97e9
FR		 4591 /*
4592 * ctl->data points to idev->cnf.forwarding, we should
4593 * not modify it until we get the rtnl lock.
4594 */
4595 lctl = *ctl;
4596 lctl.data = &val;
4597
4598 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 4599
c8fecf22 4600 if (write)
b325fddb 4601 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4602 if (ret)
4603 *ppos = pos;
1ab1457c 4604 return ret;
1da177e4
LT		 4605}
4606
56d417b1
BH		 4607static void dev_disable_change(struct inet6_dev *idev)
4608{
75538c2b
CW		 4609 struct netdev_notifier_info info;
4610
56d417b1
BH		 4611 if (!idev || !idev->dev)
4612 return;
4613
75538c2b 4614 netdev_notifier_info_init(&info, idev->dev);
56d417b1 4615 if (idev->cnf.disable_ipv6)
75538c2b 4616 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 4617 else
75538c2b 4618 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 4619}
4620
4621static void addrconf_disable_change(struct net *net, __s32 newf)
4622{
4623 struct net_device *dev;
4624 struct inet6_dev *idev;
4625
c6d14c84
ED		 4626 rcu_read_lock();
4627 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4628 idev = __in6_dev_get(dev);
4629 if (idev) {
4630 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4631 idev->cnf.disable_ipv6 = newf;
4632 if (changed)
4633 dev_disable_change(idev);
4634 }
56d417b1 4635 }
c6d14c84 4636 rcu_read_unlock();
56d417b1
BH		 4637}
4638
013d97e9 4639static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 4640{
4641 struct net *net;
013d97e9
FR		 4642 int old;
4643
4644 if (!rtnl_trylock())
4645 return restart_syscall();
56d417b1
BH		 4646
4647 net = (struct net *)table->extra2;
013d97e9
FR		 4648 old = *p;
4649 *p = newf;
56d417b1 4650
013d97e9
FR		 4651 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4652 rtnl_unlock();
56d417b1 4653 return 0;
88af182e 4654 }
56d417b1
BH		 4655
4656 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 4657 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4658 addrconf_disable_change(net, newf);
013d97e9 4659 } else if ((!newf) ^ (!old))
56d417b1
BH		 4660 dev_disable_change((struct inet6_dev *)table->extra1);
4661
4662 rtnl_unlock();
4663 return 0;
4664}
4665
4666static
fe2c6338 4667int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 4668 void __user *buffer, size_t *lenp, loff_t *ppos)
4669{
4670 int *valp = ctl->data;
4671 int val = *valp;
88af182e 4672 loff_t pos = *ppos;
fe2c6338 4673 struct ctl_table lctl;
56d417b1
BH		 4674 int ret;
4675
013d97e9
FR		 4676 /*
4677 * ctl->data points to idev->cnf.disable_ipv6, we should
4678 * not modify it until we get the rtnl lock.
4679 */
4680 lctl = *ctl;
4681 lctl.data = &val;
4682
4683 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 4684
4685 if (write)
4686 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4687 if (ret)
4688 *ppos = pos;
56d417b1
BH		 4689 return ret;
4690}
4691
1da177e4
LT		 4692static struct addrconf_sysctl_table
4693{
4694 struct ctl_table_header *sysctl_header;
fe2c6338 4695 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 4696} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4697 .sysctl_header = NULL,
4698 .addrconf_vars = {
1ab1457c 4699 {
e21e8467
SH		 4700 .procname = "forwarding",
4701 .data = &ipv6_devconf.forwarding,
4702 .maxlen = sizeof(int),
4703 .mode = 0644,
4704 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4705 },
4706 {
e21e8467
SH		 4707 .procname = "hop_limit",
4708 .data = &ipv6_devconf.hop_limit,
4709 .maxlen = sizeof(int),
4710 .mode = 0644,
4711 .proc_handler = proc_dointvec,
1da177e4
LT		 4712 },
4713 {
e21e8467
SH		 4714 .procname = "mtu",
4715 .data = &ipv6_devconf.mtu6,
4716 .maxlen = sizeof(int),
4717 .mode = 0644,
4718 .proc_handler = proc_dointvec,
1da177e4
LT		 4719 },
4720 {
e21e8467
SH		 4721 .procname = "accept_ra",
4722 .data = &ipv6_devconf.accept_ra,
4723 .maxlen = sizeof(int),
4724 .mode = 0644,
4725 .proc_handler = proc_dointvec,
1da177e4
LT		 4726 },
4727 {
e21e8467
SH		 4728 .procname = "accept_redirects",
4729 .data = &ipv6_devconf.accept_redirects,
4730 .maxlen = sizeof(int),
4731 .mode = 0644,
4732 .proc_handler = proc_dointvec,
1da177e4
LT		 4733 },
4734 {
e21e8467
SH		 4735 .procname = "autoconf",
4736 .data = &ipv6_devconf.autoconf,
4737 .maxlen = sizeof(int),
4738 .mode = 0644,
4739 .proc_handler = proc_dointvec,
1da177e4
LT		 4740 },
4741 {
e21e8467
SH		 4742 .procname = "dad_transmits",
4743 .data = &ipv6_devconf.dad_transmits,
4744 .maxlen = sizeof(int),
4745 .mode = 0644,
4746 .proc_handler = proc_dointvec,
1da177e4
LT		 4747 },
4748 {
e21e8467
SH		 4749 .procname = "router_solicitations",
4750 .data = &ipv6_devconf.rtr_solicits,
4751 .maxlen = sizeof(int),
4752 .mode = 0644,
4753 .proc_handler = proc_dointvec,
1da177e4
LT		 4754 },
4755 {
e21e8467
SH		 4756 .procname = "router_solicitation_interval",
4757 .data = &ipv6_devconf.rtr_solicit_interval,
4758 .maxlen = sizeof(int),
4759 .mode = 0644,
4760 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4761 },
4762 {
e21e8467
SH		 4763 .procname = "router_solicitation_delay",
4764 .data = &ipv6_devconf.rtr_solicit_delay,
4765 .maxlen = sizeof(int),
4766 .mode = 0644,
4767 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4768 },
4769 {
e21e8467
SH		 4770 .procname = "force_mld_version",
4771 .data = &ipv6_devconf.force_mld_version,
4772 .maxlen = sizeof(int),
4773 .mode = 0644,
4774 .proc_handler = proc_dointvec,
1da177e4 4775 },
fc4eba58
HFS		 4776 {
4777 .procname = "mldv1_unsolicited_report_interval",
4778 .data =
4779 &ipv6_devconf.mldv1_unsolicited_report_interval,
4780 .maxlen = sizeof(int),
4781 .mode = 0644,
4782 .proc_handler = proc_dointvec_ms_jiffies,
4783 },
4784 {
4785 .procname = "mldv2_unsolicited_report_interval",
4786 .data =
4787 &ipv6_devconf.mldv2_unsolicited_report_interval,
4788 .maxlen = sizeof(int),
4789 .mode = 0644,
4790 .proc_handler = proc_dointvec_ms_jiffies,
4791 },
1da177e4 4792 {
e21e8467
SH		 4793 .procname = "use_tempaddr",
4794 .data = &ipv6_devconf.use_tempaddr,
4795 .maxlen = sizeof(int),
4796 .mode = 0644,
4797 .proc_handler = proc_dointvec,
1da177e4
LT		 4798 },
4799 {
e21e8467
SH		 4800 .procname = "temp_valid_lft",
4801 .data = &ipv6_devconf.temp_valid_lft,
4802 .maxlen = sizeof(int),
4803 .mode = 0644,
4804 .proc_handler = proc_dointvec,
1da177e4
LT		 4805 },
4806 {
e21e8467
SH		 4807 .procname = "temp_prefered_lft",
4808 .data = &ipv6_devconf.temp_prefered_lft,
4809 .maxlen = sizeof(int),
4810 .mode = 0644,
4811 .proc_handler = proc_dointvec,
1da177e4
LT		 4812 },
4813 {
e21e8467
SH		 4814 .procname = "regen_max_retry",
4815 .data = &ipv6_devconf.regen_max_retry,
4816 .maxlen = sizeof(int),
4817 .mode = 0644,
4818 .proc_handler = proc_dointvec,
1da177e4
LT		 4819 },
4820 {
e21e8467
SH		 4821 .procname = "max_desync_factor",
4822 .data = &ipv6_devconf.max_desync_factor,
4823 .maxlen = sizeof(int),
4824 .mode = 0644,
4825 .proc_handler = proc_dointvec,
1da177e4 4826 },
1da177e4 4827 {
e21e8467
SH		 4828 .procname = "max_addresses",
4829 .data = &ipv6_devconf.max_addresses,
4830 .maxlen = sizeof(int),
4831 .mode = 0644,
4832 .proc_handler = proc_dointvec,
1da177e4 4833 },
65f5c7c1 4834 {
e21e8467
SH		 4835 .procname = "accept_ra_defrtr",
4836 .data = &ipv6_devconf.accept_ra_defrtr,
4837 .maxlen = sizeof(int),
4838 .mode = 0644,
4839 .proc_handler = proc_dointvec,
65f5c7c1 4840 },
c4fd30eb 4841 {
e21e8467
SH		 4842 .procname = "accept_ra_pinfo",
4843 .data = &ipv6_devconf.accept_ra_pinfo,
4844 .maxlen = sizeof(int),
4845 .mode = 0644,
4846 .proc_handler = proc_dointvec,
c4fd30eb 4847 },
930d6ff2
YH		 4848#ifdef CONFIG_IPV6_ROUTER_PREF
4849 {
e21e8467
SH		 4850 .procname = "accept_ra_rtr_pref",
4851 .data = &ipv6_devconf.accept_ra_rtr_pref,
4852 .maxlen = sizeof(int),
4853 .mode = 0644,
4854 .proc_handler = proc_dointvec,
930d6ff2 4855 },
52e16356 4856 {
e21e8467
SH		 4857 .procname = "router_probe_interval",
4858 .data = &ipv6_devconf.rtr_probe_interval,
4859 .maxlen = sizeof(int),
4860 .mode = 0644,
4861 .proc_handler = proc_dointvec_jiffies,
52e16356 4862 },
fa03ef38 4863#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4864 {
e21e8467
SH		 4865 .procname = "accept_ra_rt_info_max_plen",
4866 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4867 .maxlen = sizeof(int),
4868 .mode = 0644,
4869 .proc_handler = proc_dointvec,
09c884d4
YH		 4870 },
4871#endif
930d6ff2 4872#endif
fbea49e1 4873 {
e21e8467
SH		 4874 .procname = "proxy_ndp",
4875 .data = &ipv6_devconf.proxy_ndp,
4876 .maxlen = sizeof(int),
4877 .mode = 0644,
4878 .proc_handler = proc_dointvec,
fbea49e1 4879 },
0bcbc926 4880 {
e21e8467
SH		 4881 .procname = "accept_source_route",
4882 .data = &ipv6_devconf.accept_source_route,
4883 .maxlen = sizeof(int),
4884 .mode = 0644,
4885 .proc_handler = proc_dointvec,
0bcbc926 4886 },
95c385b4
NH		 4887#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4888 {
e21e8467
SH		 4889 .procname = "optimistic_dad",
4890 .data = &ipv6_devconf.optimistic_dad,
4891 .maxlen = sizeof(int),
4892 .mode = 0644,
4893 .proc_handler = proc_dointvec,
95c385b4
NH		 4894
4895 },
7bc570c8
YH		 4896#endif
4897#ifdef CONFIG_IPV6_MROUTE
4898 {
e21e8467
SH		 4899 .procname = "mc_forwarding",
4900 .data = &ipv6_devconf.mc_forwarding,
4901 .maxlen = sizeof(int),
4902 .mode = 0444,
4903 .proc_handler = proc_dointvec,
7bc570c8 4904 },
95c385b4 4905#endif
778d80be 4906 {
e21e8467
SH		 4907 .procname = "disable_ipv6",
4908 .data = &ipv6_devconf.disable_ipv6,
4909 .maxlen = sizeof(int),
4910 .mode = 0644,
4911 .proc_handler = addrconf_sysctl_disable,
778d80be 4912 },
1b34be74 4913 {
e21e8467
SH		 4914 .procname = "accept_dad",
4915 .data = &ipv6_devconf.accept_dad,
4916 .maxlen = sizeof(int),
4917 .mode = 0644,
4918 .proc_handler = proc_dointvec,
1b34be74 4919 },
f7734fdf 4920 {
f7734fdf
OP		 4921 .procname = "force_tllao",
4922 .data = &ipv6_devconf.force_tllao,
4923 .maxlen = sizeof(int),
4924 .mode = 0644,
4925 .proc_handler = proc_dointvec
4926 },
5cb04436
HFS		 4927 {
4928 .procname = "ndisc_notify",
4929 .data = &ipv6_devconf.ndisc_notify,
4930 .maxlen = sizeof(int),
4931 .mode = 0644,
4932 .proc_handler = proc_dointvec
4933 },
b800c3b9
HFS		 4934 {
4935 .procname = "suppress_frag_ndisc",
4936 .data = &ipv6_devconf.suppress_frag_ndisc,
4937 .maxlen = sizeof(int),
4938 .mode = 0644,
4939 .proc_handler = proc_dointvec
4940 },
1da177e4 4941 {
f8572d8f 4942 /* sentinel */
1da177e4
LT		 4943 }
4944 },
1da177e4
LT		 4945};
4946
bff16c2f 4947static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4948 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4949{
4950 int i;
1da177e4 4951 struct addrconf_sysctl_table *t;
6105e293 4952 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 4953
af879cc7 4954 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4955 if (t == NULL)
f68635e6
PE		 4956 goto out;
4957
bcdd553f 4958 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 4959 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 4960 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4961 t->addrconf_vars[i].extra2 = net;
1da177e4 4962 }
1da177e4 4963
6105e293 4964 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 4965
6105e293 4966 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
1da177e4 4967 if (t->sysctl_header == NULL)
6105e293 4968 goto free;
f68635e6
PE		 4969
4970 p->sysctl = t;
95897312 4971 return 0;
1da177e4 4972
f68635e6 4973free:
1da177e4 4974 kfree(t);
f68635e6 4975out:
95897312 4976 return -ENOBUFS;
1da177e4
LT		 4977}
4978
408c4768
PE		 4979static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4980{
4981 struct addrconf_sysctl_table *t;
4982
4983 if (p->sysctl == NULL)
4984 return;
4985
4986 t = p->sysctl;
4987 p->sysctl = NULL;
ff538818 4988 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 4989 kfree(t);
4990}
4991
f52295a9
PE		 4992static void addrconf_sysctl_register(struct inet6_dev *idev)
4993{
54716e3b 4994 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 4995 &ndisc_ifinfo_sysctl_change);
c346dca1 4996 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 4997 idev, &idev->cnf);
f52295a9
PE		 4998}
4999
408c4768 5000static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 5001{
408c4768
PE		 5002 __addrconf_sysctl_unregister(&idev->cnf);
5003 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 5004}
5005
5006
5007#endif
5008
2c8c1e72 5009static int __net_init addrconf_init_net(struct net *net)
e0da5a48 5010{
a79ca223 5011 int err = -ENOMEM;
e0da5a48
PE		 5012 struct ipv6_devconf *all, *dflt;
5013
a79ca223
HZ		 5014 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5015 if (all == NULL)
5016 goto err_alloc_all;
e0da5a48 5017
a79ca223
HZ		 5018 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5019 if (dflt == NULL)
5020 goto err_alloc_dflt;
e0da5a48 5021
a79ca223
HZ		 5022 /* these will be inherited by all namespaces */
5023 dflt->autoconf = ipv6_defaults.autoconf;
5024 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 5025
5026 net->ipv6.devconf_all = all;
5027 net->ipv6.devconf_dflt = dflt;
5028
5029#ifdef CONFIG_SYSCTL
f8572d8f 5030 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 5031 if (err < 0)
5032 goto err_reg_all;
5033
f8572d8f 5034 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 5035 if (err < 0)
5036 goto err_reg_dflt;
5037#endif
5038 return 0;
5039
5040#ifdef CONFIG_SYSCTL
5041err_reg_dflt:
5042 __addrconf_sysctl_unregister(all);
5043err_reg_all:
5044 kfree(dflt);
5045#endif
5046err_alloc_dflt:
5047 kfree(all);
5048err_alloc_all:
5049 return err;
5050}
5051
2c8c1e72 5052static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 5053{
5054#ifdef CONFIG_SYSCTL
5055 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5056 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5057#endif
09ad9bc7 5058 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 5059 kfree(net->ipv6.devconf_dflt);
5060 kfree(net->ipv6.devconf_all);
5061 }
5062}
5063
5064static struct pernet_operations addrconf_ops = {
5065 .init = addrconf_init_net,
5066 .exit = addrconf_exit_net,
5067};
5068
b382b191
TG		 5069static struct rtnl_af_ops inet6_ops = {
5070 .family = AF_INET6,
5071 .fill_link_af = inet6_fill_link_af,
5072 .get_link_af_size = inet6_get_link_af_size,
f53adae4 5073 .set_link_af = inet6_set_link_af,
b382b191
TG		 5074};
5075
1da177e4
LT		 5076/*
5077 * Init / cleanup code
5078 */
5079
5080int __init addrconf_init(void)
5081{
c2e21293 5082 int i, err;
2a8cc6c8 5083
e21e8467
SH		 5084 err = ipv6_addr_label_init();
5085 if (err < 0) {
f3213831
JP		 5086 pr_crit("%s: cannot initialize default policy table: %d\n",
5087 __func__, err);
2cc6d2bf 5088 goto out;
2a8cc6c8 5089 }
1da177e4 5090
2cc6d2bf
NH		 5091 err = register_pernet_subsys(&addrconf_ops);
5092 if (err < 0)
5093 goto out_addrlabel;
e0da5a48 5094
1da177e4
LT		 5095 /* The addrconf netdev notifier requires that loopback_dev
5096 * has it's ipv6 private information allocated and setup
5097 * before it can bring up and give link-local addresses
5098 * to other devices which are up.
5099 *
5100 * Unfortunately, loopback_dev is not necessarily the first
5101 * entry in the global dev_base list of net devices. In fact,
5102 * it is likely to be the very last entry on that list.
5103 * So this causes the notifier registry below to try and
5104 * give link-local addresses to all devices besides loopback_dev
5105 * first, then loopback_dev, which cases all the non-loopback_dev
5106 * devices to fail to get a link-local address.
5107 *
5108 * So, as a temporary fix, allocate the ipv6 structure for
5109 * loopback_dev first by hand.
5110 * Longer term, all of the dependencies ipv6 has upon the loopback
5111 * device and it being up should be removed.
5112 */
5113 rtnl_lock();
2774c7ab 5114 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 5115 err = -ENOMEM;
5116 rtnl_unlock();
5117 if (err)
e0da5a48 5118 goto errlo;
1da177e4 5119
c2e21293 5120 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5121 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5122
1da177e4
LT		 5123 register_netdevice_notifier(&ipv6_dev_notf);
5124
1da177e4 5125 addrconf_verify(0);
c127ea2c 5126
b382b191
TG		 5127 err = rtnl_af_register(&inet6_ops);
5128 if (err < 0)
5129 goto errout_af;
5130
c7ac8679
GR		 5131 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5132 NULL);
c127ea2c
TG		 5133 if (err < 0)
5134 goto errout;
5135
5136 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 5137 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5138 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5139 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5140 inet6_dump_ifaddr, NULL);
5141 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5142 inet6_dump_ifmcaddr, NULL);
5143 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5144 inet6_dump_ifacaddr, NULL);
76f8f6cb 5145 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 5146 inet6_netconf_dump_devconf, NULL);
c127ea2c 5147
2a8cc6c8
YH		 5148 ipv6_addr_label_rtnl_register();
5149
1da177e4 5150 return 0;
c127ea2c 5151errout:
b382b191
TG		 5152 rtnl_af_unregister(&inet6_ops);
5153errout_af:
c127ea2c 5154 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 5155errlo:
5156 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 5157out_addrlabel:
5158 ipv6_addr_label_cleanup();
5159out:
c127ea2c 5160 return err;
1da177e4
LT		 5161}
5162
09f7709f 5163void addrconf_cleanup(void)
1da177e4 5164{
176c39af 5165 struct net_device *dev;
1da177e4
LT		 5166 int i;
5167
5168 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5169 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 5170 ipv6_addr_label_cleanup();
1da177e4
LT		 5171
5172 rtnl_lock();
5173
b382b191
TG		 5174 __rtnl_af_unregister(&inet6_ops);
5175
176c39af
DL		 5176 /* clean dev list */
5177 for_each_netdev(&init_net, dev) {
5178 if (__in6_dev_get(dev) == NULL)
5179 continue;
5180 addrconf_ifdown(dev, 1);
5181 }
5182 addrconf_ifdown(init_net.loopback_dev, 2);
5183
1da177e4
LT		 5184 /*
5185 * Check hash table.
5186 */
5c578aed 5187 spin_lock_bh(&addrconf_hash_lock);
c2e21293 5188 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5189 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 5190 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 5191
5192 del_timer(&addr_chk_timer);
1da177e4 5193 rtnl_unlock();
1da177e4 5194}
Linux 6.x block layer and io_uring tree(s)