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net: make all team port device link events urgent
[deliverable/linux.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <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
LT		 86
87#ifdef CONFIG_IPV6_PRIVACY
88#include <linux/random.h>
1da177e4
LT		 89#endif
90
e21e8467 91#include <linux/uaccess.h>
7f7d9a6b 92#include <asm/unaligned.h>
1da177e4
LT		 93
94#include <linux/proc_fs.h>
95#include <linux/seq_file.h>
bc3b2d7f 96#include <linux/export.h>
1da177e4
LT		 97
98/* Set to 3 to get tracing... */
99#define ACONF_DEBUG 2
100
101#if ACONF_DEBUG >= 3
102#define ADBG(x) printk x
103#else
104#define ADBG(x)
105#endif
106
107#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e
TG		 108
109static inline u32 cstamp_delta(unsigned long cstamp)
110{
111 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
112}
1da177e4
LT		 113
114#ifdef CONFIG_SYSCTL
f52295a9 115static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 116static void addrconf_sysctl_unregister(struct inet6_dev *idev);
117#else
118static inline void addrconf_sysctl_register(struct inet6_dev *idev)
119{
120}
121
122static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
123{
124}
1da177e4
LT		 125#endif
126
127#ifdef CONFIG_IPV6_PRIVACY
eb7e0575
SD		 128static void __ipv6_regen_rndid(struct inet6_dev *idev);
129static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 130static void ipv6_regen_rndid(unsigned long data);
1da177e4
LT		 131#endif
132
1b34be74 133static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 134static int ipv6_count_addresses(struct inet6_dev *idev);
135
136/*
137 * Configured unicast address hash table
138 */
c2e21293 139static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 140static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 141
1da177e4
LT		 142static void addrconf_verify(unsigned long);
143
8d06afab 144static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 145static DEFINE_SPINLOCK(addrconf_verify_lock);
146
147static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
148static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
149
93d9b7d7
JP		 150static void addrconf_type_change(struct net_device *dev,
151 unsigned long event);
1da177e4
LT		 152static int addrconf_ifdown(struct net_device *dev, int how);
153
21caa662
RK		 154static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
155 int plen,
156 const struct net_device *dev,
157 u32 flags, u32 noflags);
158
cf22f9a2 159static void addrconf_dad_start(struct inet6_ifaddr *ifp);
1da177e4
LT		 160static void addrconf_dad_timer(unsigned long data);
161static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 162static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 163static void addrconf_rs_timer(unsigned long data);
164static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
165static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
166
1ab1457c 167static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 168 struct prefix_info *pinfo);
3e81c6da
DM		 169static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
170 struct net_device *dev);
1da177e4 171
888c848e 172static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 173 .forwarding = 0,
174 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
175 .mtu6 = IPV6_MIN_MTU,
176 .accept_ra = 1,
177 .accept_redirects = 1,
178 .autoconf = 1,
179 .force_mld_version = 0,
180 .dad_transmits = 1,
181 .rtr_solicits = MAX_RTR_SOLICITATIONS,
182 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
183 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
184#ifdef CONFIG_IPV6_PRIVACY
185 .use_tempaddr = 0,
186 .temp_valid_lft = TEMP_VALID_LIFETIME,
187 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
188 .regen_max_retry = REGEN_MAX_RETRY,
189 .max_desync_factor = MAX_DESYNC_FACTOR,
190#endif
191 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 192 .accept_ra_defrtr = 1,
c4fd30eb 193 .accept_ra_pinfo = 1,
930d6ff2
YH		 194#ifdef CONFIG_IPV6_ROUTER_PREF
195 .accept_ra_rtr_pref = 1,
52e16356 196 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 197#ifdef CONFIG_IPV6_ROUTE_INFO
198 .accept_ra_rt_info_max_plen = 0,
199#endif
930d6ff2 200#endif
fbea49e1 201 .proxy_ndp = 0,
0bcbc926 202 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 203 .disable_ipv6 = 0,
1b34be74 204 .accept_dad = 1,
1da177e4
LT		 205};
206
ab32ea5d 207static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 208 .forwarding = 0,
209 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
210 .mtu6 = IPV6_MIN_MTU,
211 .accept_ra = 1,
212 .accept_redirects = 1,
213 .autoconf = 1,
214 .dad_transmits = 1,
215 .rtr_solicits = MAX_RTR_SOLICITATIONS,
216 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
217 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
218#ifdef CONFIG_IPV6_PRIVACY
219 .use_tempaddr = 0,
220 .temp_valid_lft = TEMP_VALID_LIFETIME,
221 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
222 .regen_max_retry = REGEN_MAX_RETRY,
223 .max_desync_factor = MAX_DESYNC_FACTOR,
224#endif
225 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 226 .accept_ra_defrtr = 1,
c4fd30eb 227 .accept_ra_pinfo = 1,
930d6ff2
YH		 228#ifdef CONFIG_IPV6_ROUTER_PREF
229 .accept_ra_rtr_pref = 1,
52e16356 230 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 231#ifdef CONFIG_IPV6_ROUTE_INFO
232 .accept_ra_rt_info_max_plen = 0,
233#endif
930d6ff2 234#endif
fbea49e1 235 .proxy_ndp = 0,
0bcbc926 236 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 237 .disable_ipv6 = 0,
1b34be74 238 .accept_dad = 1,
1da177e4
LT		 239};
240
241/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 242const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4 243const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
f3ee4010
YH		 244const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
245const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
2c5e8933
HFS		 246const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
247const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
248const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
1da177e4 249
f24e3d65 250/* Check if a valid qdisc is available */
05297949 251static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 252{
05297949 253 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 254}
255
1da177e4
LT		 256static void addrconf_del_timer(struct inet6_ifaddr *ifp)
257{
258 if (del_timer(&ifp->timer))
259 __in6_ifa_put(ifp);
260}
261
e21e8467 262enum addrconf_timer_t {
1da177e4
LT		 263 AC_NONE,
264 AC_DAD,
265 AC_RS,
266};
267
268static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
269 enum addrconf_timer_t what,
270 unsigned long when)
271{
272 if (!del_timer(&ifp->timer))
273 in6_ifa_hold(ifp);
274
275 switch (what) {
276 case AC_DAD:
277 ifp->timer.function = addrconf_dad_timer;
278 break;
279 case AC_RS:
280 ifp->timer.function = addrconf_rs_timer;
281 break;
e21e8467
SH		 282 default:
283 break;
1da177e4
LT		 284 }
285 ifp->timer.expires = jiffies + when;
286 add_timer(&ifp->timer);
287}
288
7f7d9a6b
HX		 289static int snmp6_alloc_dev(struct inet6_dev *idev)
290{
7d720c3e 291 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
1823e4c8
ED		 292 sizeof(struct ipstats_mib),
293 __alignof__(struct ipstats_mib)) < 0)
7f7d9a6b 294 goto err_ip;
be281e55
ED		 295 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
296 GFP_KERNEL);
297 if (!idev->stats.icmpv6dev)
7f7d9a6b 298 goto err_icmp;
be281e55
ED		 299 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
300 GFP_KERNEL);
301 if (!idev->stats.icmpv6msgdev)
14878f75 302 goto err_icmpmsg;
7f7d9a6b
HX		 303
304 return 0;
305
14878f75 306err_icmpmsg:
be281e55 307 kfree(idev->stats.icmpv6dev);
7f7d9a6b 308err_icmp:
7d720c3e 309 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b 310err_ip:
aaf70ec7 311 return -ENOMEM;
7f7d9a6b
HX		 312}
313
16910b98 314static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 315{
be281e55
ED		 316 kfree(idev->stats.icmpv6msgdev);
317 kfree(idev->stats.icmpv6dev);
7d720c3e 318 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b
HX		 319}
320
1da177e4
LT		 321/* Nobody refers to this device, we may destroy it. */
322
323void in6_dev_finish_destroy(struct inet6_dev *idev)
324{
325 struct net_device *dev = idev->dev;
547b792c 326
502a2ffd 327 WARN_ON(!list_empty(&idev->addr_list));
547b792c
IJ		 328 WARN_ON(idev->mc_list != NULL);
329
1da177e4 330#ifdef NET_REFCNT_DEBUG
91df42be 331 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
1da177e4
LT		 332#endif
333 dev_put(dev);
334 if (!idev->dead) {
f3213831 335 pr_warn("Freeing alive inet6 device %p\n", idev);
1da177e4
LT		 336 return;
337 }
338 snmp6_free_dev(idev);
38f57d1a 339 kfree_rcu(idev, rcu);
1da177e4 340}
7159039a
YH		 341EXPORT_SYMBOL(in6_dev_finish_destroy);
342
8e5e8f30 343static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 344{
345 struct inet6_dev *ndev;
346
347 ASSERT_RTNL();
348
349 if (dev->mtu < IPV6_MIN_MTU)
350 return NULL;
351
1ab1457c 352 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 353
1ab1457c
YH		 354 if (ndev == NULL)
355 return NULL;
322f74a4
IO		 356
357 rwlock_init(&ndev->lock);
358 ndev->dev = dev;
502a2ffd 359 INIT_LIST_HEAD(&ndev->addr_list);
360
c346dca1 361 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 362 ndev->cnf.mtu6 = dev->mtu;
363 ndev->cnf.sysctl = NULL;
364 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
365 if (ndev->nd_parms == NULL) {
366 kfree(ndev);
367 return NULL;
368 }
0187bdfb
BH		 369 if (ndev->cnf.forwarding)
370 dev_disable_lro(dev);
322f74a4
IO		 371 /* We refer to the device */
372 dev_hold(dev);
1da177e4 373
322f74a4
IO		 374 if (snmp6_alloc_dev(ndev) < 0) {
375 ADBG((KERN_WARNING
f3213831 376 "%s: cannot allocate memory for statistics; dev=%s.\n",
0dc47877 377 __func__, dev->name));
322f74a4 378 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 379 dev_put(dev);
380 kfree(ndev);
322f74a4
IO		 381 return NULL;
382 }
1da177e4 383
322f74a4
IO		 384 if (snmp6_register_dev(ndev) < 0) {
385 ADBG((KERN_WARNING
f3213831 386 "%s: cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 387 __func__, dev->name));
322f74a4
IO		 388 neigh_parms_release(&nd_tbl, ndev->nd_parms);
389 ndev->dead = 1;
390 in6_dev_finish_destroy(ndev);
391 return NULL;
392 }
393
394 /* One reference from device. We must do this before
395 * we invoke __ipv6_regen_rndid().
396 */
397 in6_dev_hold(ndev);
1da177e4 398
1b34be74
YH		 399 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
400 ndev->cnf.accept_dad = -1;
401
07a93626 402#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 403 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 404 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 405 ndev->cnf.rtr_solicits = 0;
406 }
407#endif
408
1da177e4 409#ifdef CONFIG_IPV6_PRIVACY
372e6c8f 410 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 411 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 412 if ((dev->flags&IFF_LOOPBACK) ||
413 dev->type == ARPHRD_TUNNEL ||
9625ed72 414 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 415 dev->type == ARPHRD_SIT ||
0be669bb 416 dev->type == ARPHRD_NONE) {
322f74a4
IO		 417 ndev->cnf.use_tempaddr = -1;
418 } else {
419 in6_dev_hold(ndev);
420 ipv6_regen_rndid((unsigned long) ndev);
421 }
1da177e4 422#endif
914faa14 423 ndev->token = in6addr_any;
1da177e4 424
f24e3d65 425 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 426 ndev->if_flags |= IF_READY;
427
322f74a4
IO		 428 ipv6_mc_init_dev(ndev);
429 ndev->tstamp = jiffies;
f52295a9 430 addrconf_sysctl_register(ndev);
30c4cf57 431 /* protected by rtnl_lock */
cf778b00 432 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 433
2c5e8933
HFS		 434 /* Join interface-local all-node multicast group */
435 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
436
d88ae4cc 437 /* Join all-node multicast group */
f3ee4010 438 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 439
d6ddef9e 440 /* Join all-router multicast group if forwarding is set */
8b2aaede 441 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 442 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
443
1da177e4
LT		 444 return ndev;
445}
446
8e5e8f30 447static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 448{
449 struct inet6_dev *idev;
450
451 ASSERT_RTNL();
452
e21e8467
SH		 453 idev = __in6_dev_get(dev);
454 if (!idev) {
455 idev = ipv6_add_dev(dev);
456 if (!idev)
1da177e4
LT		 457 return NULL;
458 }
c5e33bdd 459
1da177e4
LT		 460 if (dev->flags&IFF_UP)
461 ipv6_mc_up(idev);
462 return idev;
463}
464
f3a1bfb1
ND		 465static int inet6_netconf_msgsize_devconf(int type)
466{
467 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
468 + nla_total_size(4); /* NETCONFA_IFINDEX */
469
76f8f6cb
ND		 470 /* type -1 is used for ALL */
471 if (type == -1 || type == NETCONFA_FORWARDING)
f3a1bfb1 472 size += nla_total_size(4);
b1afce95 473#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 474 if (type == -1 || type == NETCONFA_MC_FORWARDING)
475 size += nla_total_size(4);
b1afce95 476#endif
f3a1bfb1
ND		 477
478 return size;
479}
480
481static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
482 struct ipv6_devconf *devconf, u32 portid,
483 u32 seq, int event, unsigned int flags,
484 int type)
485{
486 struct nlmsghdr *nlh;
487 struct netconfmsg *ncm;
488
489 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
490 flags);
491 if (nlh == NULL)
492 return -EMSGSIZE;
493
494 ncm = nlmsg_data(nlh);
495 ncm->ncm_family = AF_INET6;
496
497 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
498 goto nla_put_failure;
499
76f8f6cb
ND		 500 /* type -1 is used for ALL */
501 if ((type == -1 || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 502 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
503 goto nla_put_failure;
b1afce95 504#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 505 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
506 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
507 devconf->mc_forwarding) < 0)
508 goto nla_put_failure;
b1afce95 509#endif
f3a1bfb1
ND		 510 return nlmsg_end(skb, nlh);
511
512nla_put_failure:
513 nlmsg_cancel(skb, nlh);
514 return -EMSGSIZE;
515}
516
d67b8c61
ND		 517void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
518 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 519{
520 struct sk_buff *skb;
521 int err = -ENOBUFS;
522
523 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
524 if (skb == NULL)
525 goto errout;
526
527 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
528 RTM_NEWNETCONF, 0, type);
529 if (err < 0) {
530 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
531 WARN_ON(err == -EMSGSIZE);
532 kfree_skb(skb);
533 goto errout;
534 }
535 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
536 return;
537errout:
bd779028 538 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 539}
540
76f8f6cb
ND		 541static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
542 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
543 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
544};
545
546static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 547 struct nlmsghdr *nlh)
76f8f6cb
ND		 548{
549 struct net *net = sock_net(in_skb->sk);
550 struct nlattr *tb[NETCONFA_MAX+1];
551 struct netconfmsg *ncm;
552 struct sk_buff *skb;
553 struct ipv6_devconf *devconf;
554 struct inet6_dev *in6_dev;
555 struct net_device *dev;
556 int ifindex;
557 int err;
558
559 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
560 devconf_ipv6_policy);
561 if (err < 0)
562 goto errout;
563
564 err = EINVAL;
565 if (!tb[NETCONFA_IFINDEX])
566 goto errout;
567
568 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
569 switch (ifindex) {
570 case NETCONFA_IFINDEX_ALL:
571 devconf = net->ipv6.devconf_all;
572 break;
573 case NETCONFA_IFINDEX_DEFAULT:
574 devconf = net->ipv6.devconf_dflt;
575 break;
576 default:
577 dev = __dev_get_by_index(net, ifindex);
578 if (dev == NULL)
579 goto errout;
580 in6_dev = __in6_dev_get(dev);
581 if (in6_dev == NULL)
582 goto errout;
583 devconf = &in6_dev->cnf;
584 break;
585 }
586
587 err = -ENOBUFS;
588 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
589 if (skb == NULL)
590 goto errout;
591
592 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
593 NETLINK_CB(in_skb).portid,
594 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
595 -1);
596 if (err < 0) {
597 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
598 WARN_ON(err == -EMSGSIZE);
599 kfree_skb(skb);
600 goto errout;
601 }
602 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
603errout:
604 return err;
605}
606
7a674200
ND		 607static int inet6_netconf_dump_devconf(struct sk_buff *skb,
608 struct netlink_callback *cb)
609{
610 struct net *net = sock_net(skb->sk);
611 int h, s_h;
612 int idx, s_idx;
613 struct net_device *dev;
614 struct inet6_dev *idev;
615 struct hlist_head *head;
616
617 s_h = cb->args[0];
618 s_idx = idx = cb->args[1];
619
620 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
621 idx = 0;
622 head = &net->dev_index_head[h];
623 rcu_read_lock();
63998ac2
ND		 624 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
625 net->dev_base_seq;
7a674200
ND		 626 hlist_for_each_entry_rcu(dev, head, index_hlist) {
627 if (idx < s_idx)
628 goto cont;
629 idev = __in6_dev_get(dev);
630 if (!idev)
631 goto cont;
632
633 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
634 &idev->cnf,
635 NETLINK_CB(cb->skb).portid,
636 cb->nlh->nlmsg_seq,
637 RTM_NEWNETCONF,
638 NLM_F_MULTI,
639 -1) <= 0) {
640 rcu_read_unlock();
641 goto done;
642 }
63998ac2 643 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 644cont:
645 idx++;
646 }
647 rcu_read_unlock();
648 }
649 if (h == NETDEV_HASHENTRIES) {
650 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
651 net->ipv6.devconf_all,
652 NETLINK_CB(cb->skb).portid,
653 cb->nlh->nlmsg_seq,
654 RTM_NEWNETCONF, NLM_F_MULTI,
655 -1) <= 0)
656 goto done;
657 else
658 h++;
659 }
660 if (h == NETDEV_HASHENTRIES + 1) {
661 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
662 net->ipv6.devconf_dflt,
663 NETLINK_CB(cb->skb).portid,
664 cb->nlh->nlmsg_seq,
665 RTM_NEWNETCONF, NLM_F_MULTI,
666 -1) <= 0)
667 goto done;
668 else
669 h++;
670 }
671done:
672 cb->args[0] = h;
673 cb->args[1] = idx;
674
675 return skb->len;
676}
677
1da177e4
LT		 678#ifdef CONFIG_SYSCTL
679static void dev_forward_change(struct inet6_dev *idev)
680{
681 struct net_device *dev;
682 struct inet6_ifaddr *ifa;
1da177e4
LT		 683
684 if (!idev)
685 return;
686 dev = idev->dev;
0187bdfb
BH		 687 if (idev->cnf.forwarding)
688 dev_disable_lro(dev);
1a940835 689 if (dev->flags & IFF_MULTICAST) {
2c5e8933 690 if (idev->cnf.forwarding) {
f3ee4010 691 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 692 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
693 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
694 } else {
f3ee4010 695 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 696 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
697 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
698 }
1da177e4 699 }
502a2ffd 700
701 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 702 if (ifa->flags&IFA_F_TENTATIVE)
703 continue;
1da177e4
LT		 704 if (idev->cnf.forwarding)
705 addrconf_join_anycast(ifa);
706 else
707 addrconf_leave_anycast(ifa);
708 }
f3a1bfb1
ND		 709 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
710 dev->ifindex, &idev->cnf);
1da177e4
LT		 711}
712
713
e186932b 714static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 715{
716 struct net_device *dev;
717 struct inet6_dev *idev;
718
4acd4945 719 for_each_netdev(net, dev) {
1da177e4
LT		 720 idev = __in6_dev_get(dev);
721 if (idev) {
e186932b
PE		 722 int changed = (!idev->cnf.forwarding) ^ (!newf);
723 idev->cnf.forwarding = newf;
1da177e4
LT		 724 if (changed)
725 dev_forward_change(idev);
726 }
1da177e4 727 }
1da177e4 728}
c8fecf22 729
013d97e9 730static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 731{
bff16c2f 732 struct net *net;
013d97e9
FR		 733 int old;
734
735 if (!rtnl_trylock())
736 return restart_syscall();
bff16c2f
PE		 737
738 net = (struct net *)table->extra2;
013d97e9
FR		 739 old = *p;
740 *p = newf;
b325fddb 741
013d97e9 742 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 743 if ((!newf) ^ (!old))
744 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
745 NETCONFA_IFINDEX_DEFAULT,
746 net->ipv6.devconf_dflt);
013d97e9
FR		 747 rtnl_unlock();
748 return 0;
88af182e 749 }
c8fecf22 750
e186932b 751 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 752 net->ipv6.devconf_dflt->forwarding = newf;
753 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 754 if ((!newf) ^ (!old))
755 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
756 NETCONFA_IFINDEX_ALL,
757 net->ipv6.devconf_all);
013d97e9 758 } else if ((!newf) ^ (!old))
c8fecf22 759 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 760 rtnl_unlock();
c8fecf22 761
013d97e9 762 if (newf)
7b4da532 763 rt6_purge_dflt_routers(net);
b325fddb 764 return 1;
c8fecf22 765}
1da177e4
LT		 766#endif
767
5c578aed 768/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 769void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
770{
c2e21293 771 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 772
1da177e4 773#ifdef NET_REFCNT_DEBUG
91df42be 774 pr_debug("%s\n", __func__);
1da177e4
LT		 775#endif
776
777 in6_dev_put(ifp->idev);
778
779 if (del_timer(&ifp->timer))
e21e8467 780 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
1da177e4 781
e9d3e084 782 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 783 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 784 return;
785 }
94e187c0 786 ip6_rt_put(ifp->rt);
1da177e4 787
e5785985 788 kfree_rcu(ifp, rcu);
1da177e4
LT		 789}
790
e55ffac6
BH		 791static void
792ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
793{
502a2ffd 794 struct list_head *p;
8a6ce0c0 795 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 796
797 /*
798 * Each device address list is sorted in order of scope -
799 * global before linklocal.
800 */
502a2ffd 801 list_for_each(p, &idev->addr_list) {
802 struct inet6_ifaddr *ifa
803 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 804 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 805 break;
806 }
807
b54c9b98 808 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 809}
810
ddbe5032 811static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 812{
ddbe5032 813 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 814}
815
1da177e4
LT		 816/* On success it returns ifp with increased reference count */
817
818static struct inet6_ifaddr *
819ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 820 int scope, u32 flags)
1da177e4
LT		 821{
822 struct inet6_ifaddr *ifa = NULL;
823 struct rt6_info *rt;
3a88a81d 824 unsigned int hash;
1da177e4 825 int err = 0;
d68b8270
YH		 826 int addr_type = ipv6_addr_type(addr);
827
828 if (addr_type == IPV6_ADDR_ANY ||
829 addr_type & IPV6_ADDR_MULTICAST ||
830 (!(idev->dev->flags & IFF_LOOPBACK) &&
831 addr_type & IPV6_ADDR_LOOPBACK))
832 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 833
8814c4b5 834 rcu_read_lock_bh();
1da177e4
LT		 835 if (idev->dead) {
836 err = -ENODEV; /*XXX*/
837 goto out2;
838 }
839
56d417b1 840 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 841 err = -EACCES;
842 goto out2;
843 }
844
5c578aed 845 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 846
847 /* Ignore adding duplicate addresses on an interface */
c346dca1 848 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 849 ADBG(("ipv6_add_addr: already assigned\n"));
850 err = -EEXIST;
851 goto out;
852 }
853
322f74a4 854 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 855
856 if (ifa == NULL) {
857 ADBG(("ipv6_add_addr: malloc failed\n"));
858 err = -ENOBUFS;
859 goto out;
860 }
861
8f031519 862 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 863 if (IS_ERR(rt)) {
864 err = PTR_ERR(rt);
865 goto out;
866 }
867
4e3fd7a0 868 ifa->addr = *addr;
1da177e4
LT		 869
870 spin_lock_init(&ifa->lock);
e9d3e084 871 spin_lock_init(&ifa->state_lock);
1da177e4 872 init_timer(&ifa->timer);
c2e21293 873 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 874 ifa->timer.data = (unsigned long) ifa;
875 ifa->scope = scope;
876 ifa->prefix_len = pfxlen;
877 ifa->flags = flags | IFA_F_TENTATIVE;
878 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 879 ifa->tokenized = false;
1da177e4 880
57f5f544
KF		 881 ifa->rt = rt;
882
1da177e4
LT		 883 ifa->idev = idev;
884 in6_dev_hold(idev);
885 /* For caller */
886 in6_ifa_hold(ifa);
887
888 /* Add to big hash table */
ddbe5032 889 hash = inet6_addr_hash(addr);
1da177e4 890
5c578aed 891 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 892 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 893
894 write_lock(&idev->lock);
895 /* Add to inet6_dev unicast addr list. */
e55ffac6 896 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 897
898#ifdef CONFIG_IPV6_PRIVACY
899 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 900 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 901 in6_ifa_hold(ifa);
902 }
903#endif
904
1da177e4
LT		 905 in6_ifa_hold(ifa);
906 write_unlock(&idev->lock);
907out2:
8814c4b5 908 rcu_read_unlock_bh();
1da177e4 909
fd92833a 910 if (likely(err == 0))
f88c91dd 911 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 912 else {
913 kfree(ifa);
914 ifa = ERR_PTR(err);
915 }
916
917 return ifa;
918out:
5c578aed 919 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 920 goto out2;
921}
922
923/* This function wants to get referenced ifp and releases it before return */
924
925static void ipv6_del_addr(struct inet6_ifaddr *ifp)
926{
502a2ffd 927 struct inet6_ifaddr *ifa, *ifn;
1da177e4 928 struct inet6_dev *idev = ifp->idev;
4c5ff6a6 929 int state;
1da177e4
LT		 930 int deleted = 0, onlink = 0;
931 unsigned long expires = jiffies;
932
4c5ff6a6
HX		 933 spin_lock_bh(&ifp->state_lock);
934 state = ifp->state;
e9d3e084 935 ifp->state = INET6_IFADDR_STATE_DEAD;
4c5ff6a6
HX		 936 spin_unlock_bh(&ifp->state_lock);
937
938 if (state == INET6_IFADDR_STATE_DEAD)
939 goto out;
1da177e4 940
5c578aed 941 spin_lock_bh(&addrconf_hash_lock);
942 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 943 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 944
945 write_lock_bh(&idev->lock);
946#ifdef CONFIG_IPV6_PRIVACY
947 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 948 list_del(&ifp->tmp_list);
949 if (ifp->ifpub) {
950 in6_ifa_put(ifp->ifpub);
951 ifp->ifpub = NULL;
1da177e4 952 }
372e6c8f 953 __in6_ifa_put(ifp);
1da177e4
LT		 954 }
955#endif
956
502a2ffd 957 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
1da177e4 958 if (ifa == ifp) {
502a2ffd 959 list_del_init(&ifp->if_list);
1da177e4 960 __in6_ifa_put(ifp);
502a2ffd 961
1da177e4
LT		 962 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
963 break;
964 deleted = 1;
1d142804 965 continue;
1da177e4
LT		 966 } else if (ifp->flags & IFA_F_PERMANENT) {
967 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
968 ifp->prefix_len)) {
969 if (ifa->flags & IFA_F_PERMANENT) {
970 onlink = 1;
971 if (deleted)
972 break;
973 } else {
974 unsigned long lifetime;
975
976 if (!onlink)
977 onlink = -1;
978
979 spin_lock(&ifa->lock);
4bed72e4
YH		 980
981 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
982 /*
983 * Note: Because this address is
984 * not permanent, lifetime <
985 * LONG_MAX / HZ here.
986 */
1da177e4
LT		 987 if (time_before(expires,
988 ifa->tstamp + lifetime * HZ))
989 expires = ifa->tstamp + lifetime * HZ;
990 spin_unlock(&ifa->lock);
991 }
992 }
993 }
994 }
995 write_unlock_bh(&idev->lock);
996
b2238566
AV		 997 addrconf_del_timer(ifp);
998
1da177e4
LT		 999 ipv6_ifa_notify(RTM_DELADDR, ifp);
1000
f88c91dd 1001 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1002
1da177e4
LT		 1003 /*
1004 * Purge or update corresponding prefix
1005 *
1006 * 1) we don't purge prefix here if address was not permanent.
1007 * prefix is managed by its own lifetime.
1008 * 2) if there're no addresses, delete prefix.
1009 * 3) if there're still other permanent address(es),
1010 * corresponding prefix is still permanent.
1011 * 4) otherwise, update prefix lifetime to the
1012 * longest valid lifetime among the corresponding
1013 * addresses on the device.
1014 * Note: subsequent RA will update lifetime.
1015 *
1016 * --yoshfuji
1017 */
1018 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
1019 struct in6_addr prefix;
1020 struct rt6_info *rt;
64c6d08e 1021
1da177e4 1022 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
1da177e4 1023
21caa662
RK		 1024 rt = addrconf_get_prefix_route(&prefix,
1025 ifp->prefix_len,
1026 ifp->idev->dev,
1027 0, RTF_GATEWAY | RTF_DEFAULT);
1028
1029 if (rt) {
1da177e4 1030 if (onlink == 0) {
e0a1ad73 1031 ip6_del_rt(rt);
1da177e4
LT		 1032 rt = NULL;
1033 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1716a961 1034 rt6_set_expires(rt, expires);
1da177e4
LT		 1035 }
1036 }
94e187c0 1037 ip6_rt_put(rt);
1da177e4
LT		 1038 }
1039
c3968a85
DW		 1040 /* clean up prefsrc entries */
1041 rt6_remove_prefsrc(ifp);
4c5ff6a6 1042out:
1da177e4
LT		 1043 in6_ifa_put(ifp);
1044}
1045
1046#ifdef CONFIG_IPV6_PRIVACY
1047static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1048{
1049 struct inet6_dev *idev = ifp->idev;
1050 struct in6_addr addr, *tmpaddr;
76f793e3 1051 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1052 unsigned long regen_advance;
1da177e4
LT		 1053 int tmp_plen;
1054 int ret = 0;
1055 int max_addresses;
95c385b4 1056 u32 addr_flags;
76f793e3 1057 unsigned long now = jiffies;
1da177e4
LT		 1058
1059 write_lock(&idev->lock);
1060 if (ift) {
1061 spin_lock_bh(&ift->lock);
1062 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1063 spin_unlock_bh(&ift->lock);
1064 tmpaddr = &addr;
1065 } else {
1066 tmpaddr = NULL;
1067 }
1068retry:
1069 in6_dev_hold(idev);
1070 if (idev->cnf.use_tempaddr <= 0) {
1071 write_unlock(&idev->lock);
f3213831 1072 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1073 in6_dev_put(idev);
1074 ret = -1;
1075 goto out;
1076 }
1077 spin_lock_bh(&ifp->lock);
1078 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1079 idev->cnf.use_tempaddr = -1; /*XXX*/
1080 spin_unlock_bh(&ifp->lock);
1081 write_unlock(&idev->lock);
f3213831
JP		 1082 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1083 __func__);
1da177e4
LT		 1084 in6_dev_put(idev);
1085 ret = -1;
1086 goto out;
1087 }
1088 in6_ifa_hold(ifp);
1089 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 1090 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1091 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1092 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 1093 tmp_valid_lft = min_t(__u32,
1094 ifp->valid_lft,
7a876b0e 1095 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 1096 tmp_prefered_lft = min_t(__u32,
1097 ifp->prefered_lft,
7a876b0e 1098 idev->cnf.temp_prefered_lft + age -
784e2710 1099 idev->cnf.max_desync_factor);
1da177e4
LT		 1100 tmp_plen = ifp->prefix_len;
1101 max_addresses = idev->cnf.max_addresses;
1da177e4
LT		 1102 tmp_tstamp = ifp->tstamp;
1103 spin_unlock_bh(&ifp->lock);
1104
eac55bf9
BB		 1105 regen_advance = idev->cnf.regen_max_retry *
1106 idev->cnf.dad_transmits *
1107 idev->nd_parms->retrans_time / HZ;
1da177e4 1108 write_unlock(&idev->lock);
95c385b4 1109
eac55bf9
BB		 1110 /* A temporary address is created only if this calculated Preferred
1111 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1112 * an implementation must not create a temporary address with a zero
1113 * Preferred Lifetime.
1114 */
1115 if (tmp_prefered_lft <= regen_advance) {
1116 in6_ifa_put(ifp);
1117 in6_dev_put(idev);
1118 ret = -1;
1119 goto out;
1120 }
1121
95c385b4
NH		 1122 addr_flags = IFA_F_TEMPORARY;
1123 /* set in addrconf_prefix_rcv() */
1124 if (ifp->flags & IFA_F_OPTIMISTIC)
1125 addr_flags |= IFA_F_OPTIMISTIC;
1126
1da177e4 1127 ift = !max_addresses ||
1ab1457c 1128 ipv6_count_addresses(idev) < max_addresses ?
88924753 1129 ipv6_add_addr(idev, &addr, tmp_plen, ipv6_addr_scope(&addr),
95c385b4 1130 addr_flags) : NULL;
3f0d2ba0 1131 if (IS_ERR_OR_NULL(ift)) {
1da177e4
LT		 1132 in6_ifa_put(ifp);
1133 in6_dev_put(idev);
f3213831 1134 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4
LT		 1135 tmpaddr = &addr;
1136 write_lock(&idev->lock);
1137 goto retry;
1138 }
1139
1140 spin_lock_bh(&ift->lock);
1141 ift->ifpub = ifp;
1142 ift->valid_lft = tmp_valid_lft;
1143 ift->prefered_lft = tmp_prefered_lft;
76f793e3 1144 ift->cstamp = now;
1da177e4
LT		 1145 ift->tstamp = tmp_tstamp;
1146 spin_unlock_bh(&ift->lock);
1147
cf22f9a2 1148 addrconf_dad_start(ift);
1da177e4
LT		 1149 in6_ifa_put(ift);
1150 in6_dev_put(idev);
1151out:
1152 return ret;
1153}
1154#endif
1155
1156/*
072047e4 1157 * Choose an appropriate source address (RFC3484)
1da177e4 1158 */
a9b05723
YH		 1159enum {
1160 IPV6_SADDR_RULE_INIT = 0,
1161 IPV6_SADDR_RULE_LOCAL,
1162 IPV6_SADDR_RULE_SCOPE,
1163 IPV6_SADDR_RULE_PREFERRED,
1164#ifdef CONFIG_IPV6_MIP6
1165 IPV6_SADDR_RULE_HOA,
1166#endif
1167 IPV6_SADDR_RULE_OIF,
1168 IPV6_SADDR_RULE_LABEL,
1169#ifdef CONFIG_IPV6_PRIVACY
1170 IPV6_SADDR_RULE_PRIVACY,
1171#endif
1172 IPV6_SADDR_RULE_ORCHID,
1173 IPV6_SADDR_RULE_PREFIX,
1174 IPV6_SADDR_RULE_MAX
1175};
1176
072047e4 1177struct ipv6_saddr_score {
a9b05723
YH		 1178 int rule;
1179 int addr_type;
1180 struct inet6_ifaddr *ifa;
1181 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1182 int scopedist;
1183 int matchlen;
072047e4
YH		 1184};
1185
a9b05723 1186struct ipv6_saddr_dst {
9acd9f3a 1187 const struct in6_addr *addr;
a9b05723
YH		 1188 int ifindex;
1189 int scope;
1190 int label;
7cbca67c 1191 unsigned int prefs;
a9b05723 1192};
072047e4 1193
b6f99a21 1194static inline int ipv6_saddr_preferred(int type)
1da177e4 1195{
45bb0060 1196 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1197 return 1;
1198 return 0;
1da177e4
LT		 1199}
1200
3de23255
BT		 1201static int ipv6_get_saddr_eval(struct net *net,
1202 struct ipv6_saddr_score *score,
a9b05723
YH		 1203 struct ipv6_saddr_dst *dst,
1204 int i)
1205{
1206 int ret;
1207
1208 if (i <= score->rule) {
1209 switch (i) {
1210 case IPV6_SADDR_RULE_SCOPE:
1211 ret = score->scopedist;
1212 break;
1213 case IPV6_SADDR_RULE_PREFIX:
1214 ret = score->matchlen;
1215 break;
1216 default:
1217 ret = !!test_bit(i, score->scorebits);
1218 }
1219 goto out;
1220 }
1221
1222 switch (i) {
1223 case IPV6_SADDR_RULE_INIT:
1224 /* Rule 0: remember if hiscore is not ready yet */
1225 ret = !!score->ifa;
1226 break;
1227 case IPV6_SADDR_RULE_LOCAL:
1228 /* Rule 1: Prefer same address */
1229 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1230 break;
1231 case IPV6_SADDR_RULE_SCOPE:
1232 /* Rule 2: Prefer appropriate scope
1233 *
1234 * ret
1235 * ^
1236 * -1 | d 15
1237 * ---+--+-+---> scope
1238 * |
1239 * | d is scope of the destination.
1240 * B-d | \
1241 * | \ <- smaller scope is better if
1242 * B-15 | \ if scope is enough for destinaion.
1243 * | ret = B - scope (-1 <= scope >= d <= 15).
1244 * d-C-1 | /
1245 * |/ <- greater is better
1246 * -C / if scope is not enough for destination.
1247 * /| ret = scope - C (-1 <= d < scope <= 15).
1248 *
1249 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1250 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1251 * Assume B = 0 and we get C > 29.
1252 */
1253 ret = __ipv6_addr_src_scope(score->addr_type);
1254 if (ret >= dst->scope)
1255 ret = -ret;
1256 else
1257 ret -= 128; /* 30 is enough */
1258 score->scopedist = ret;
1259 break;
1260 case IPV6_SADDR_RULE_PREFERRED:
1261 /* Rule 3: Avoid deprecated and optimistic addresses */
1262 ret = ipv6_saddr_preferred(score->addr_type) ||
1263 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1264 break;
1265#ifdef CONFIG_IPV6_MIP6
1266 case IPV6_SADDR_RULE_HOA:
7cbca67c 1267 {
a9b05723 1268 /* Rule 4: Prefer home address */
7cbca67c
YH		 1269 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1270 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1271 break;
7cbca67c 1272 }
a9b05723
YH		 1273#endif
1274 case IPV6_SADDR_RULE_OIF:
1275 /* Rule 5: Prefer outgoing interface */
1276 ret = (!dst->ifindex ||
1277 dst->ifindex == score->ifa->idev->dev->ifindex);
1278 break;
1279 case IPV6_SADDR_RULE_LABEL:
1280 /* Rule 6: Prefer matching label */
3de23255
BT		 1281 ret = ipv6_addr_label(net,
1282 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1283 score->ifa->idev->dev->ifindex) == dst->label;
1284 break;
1285#ifdef CONFIG_IPV6_PRIVACY
1286 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1287 {
a9b05723 1288 /* Rule 7: Prefer public address
25985edc 1289 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1290 */
7cbca67c
YH		 1291 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1292 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1293 score->ifa->idev->cnf.use_tempaddr >= 2;
1294 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1295 break;
7cbca67c 1296 }
a9b05723
YH		 1297#endif
1298 case IPV6_SADDR_RULE_ORCHID:
1299 /* Rule 8-: Prefer ORCHID vs ORCHID or
1300 * non-ORCHID vs non-ORCHID
1301 */
1302 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1303 ipv6_addr_orchid(dst->addr));
1304 break;
1305 case IPV6_SADDR_RULE_PREFIX:
1306 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1307 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1308 if (ret > score->ifa->prefix_len)
1309 ret = score->ifa->prefix_len;
1310 score->matchlen = ret;
a9b05723
YH		 1311 break;
1312 default:
1313 ret = 0;
1314 }
1315
1316 if (ret)
1317 __set_bit(i, score->scorebits);
1318 score->rule = i;
1319out:
1320 return ret;
1321}
1322
b3f644fc 1323int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1324 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1325 struct in6_addr *saddr)
1da177e4 1326{
a9b05723
YH		 1327 struct ipv6_saddr_score scores[2],
1328 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1329 struct ipv6_saddr_dst dst;
072047e4 1330 struct net_device *dev;
a9b05723 1331 int dst_type;
1da177e4 1332
a9b05723
YH		 1333 dst_type = __ipv6_addr_type(daddr);
1334 dst.addr = daddr;
1335 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1336 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1337 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1338 dst.prefs = prefs;
a9b05723
YH		 1339
1340 hiscore->rule = -1;
1341 hiscore->ifa = NULL;
1da177e4 1342
8814c4b5 1343 rcu_read_lock();
1da177e4 1344
c6d14c84 1345 for_each_netdev_rcu(net, dev) {
072047e4 1346 struct inet6_dev *idev;
072047e4 1347
a9b05723 1348 /* Candidate Source Address (section 4)
072047e4
YH		 1349 * - multicast and link-local destination address,
1350 * the set of candidate source address MUST only
1351 * include addresses assigned to interfaces
1352 * belonging to the same link as the outgoing
1353 * interface.
1354 * (- For site-local destination addresses, the
1355 * set of candidate source addresses MUST only
1356 * include addresses assigned to interfaces
1357 * belonging to the same site as the outgoing
1358 * interface.)
1359 */
a9b05723
YH		 1360 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1361 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1362 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1363 continue;
1da177e4 1364
1da177e4 1365 idev = __in6_dev_get(dev);
072047e4
YH		 1366 if (!idev)
1367 continue;
1368
1369 read_lock_bh(&idev->lock);
502a2ffd 1370 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1371 int i;
072047e4 1372
a9b05723 1373 /*
6b3ae80a
YH		 1374 * - Tentative Address (RFC2462 section 5.4)
1375 * - A tentative address is not considered
1376 * "assigned to an interface" in the traditional
95c385b4 1377 * sense, unless it is also flagged as optimistic.
6b3ae80a 1378 * - Candidate Source Address (section 4)
072047e4
YH		 1379 * - In any case, anycast addresses, multicast
1380 * addresses, and the unspecified address MUST
1381 * NOT be included in a candidate set.
1382 */
a9b05723
YH		 1383 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1384 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1385 continue;
a9b05723
YH		 1386
1387 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1388
1389 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1390 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1391 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1392 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1393 "assigned as unicast address on %s",
1394 dev->name);
1395 continue;
1396 }
1397
a9b05723
YH		 1398 score->rule = -1;
1399 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1400
1401 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1402 int minihiscore, miniscore;
1403
3de23255
BT		 1404 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1405 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1406
1407 if (minihiscore > miniscore) {
1408 if (i == IPV6_SADDR_RULE_SCOPE &&
1409 score->scopedist > 0) {
1410 /*
1411 * special case:
1412 * each remaining entry
1413 * has too small (not enough)
1414 * scope, because ifa entries
1415 * are sorted by their scope
1416 * values.
1417 */
1418 goto try_nextdev;
1419 }
1420 break;
1421 } else if (minihiscore < miniscore) {
a9b05723
YH		 1422 if (hiscore->ifa)
1423 in6_ifa_put(hiscore->ifa);
1424
1425 in6_ifa_hold(score->ifa);
1426
a0bffffc 1427 swap(hiscore, score);
a9b05723
YH		 1428
1429 /* restore our iterator */
1430 score->ifa = hiscore->ifa;
1431
1432 break;
1da177e4 1433 }
072047e4 1434 }
1da177e4 1435 }
a9b05723 1436try_nextdev:
072047e4 1437 read_unlock_bh(&idev->lock);
1da177e4 1438 }
8814c4b5 1439 rcu_read_unlock();
1da177e4 1440
a9b05723 1441 if (!hiscore->ifa)
072047e4 1442 return -EADDRNOTAVAIL;
1ab1457c 1443
4e3fd7a0 1444 *saddr = hiscore->ifa->addr;
a9b05723 1445 in6_ifa_put(hiscore->ifa);
072047e4 1446 return 0;
1da177e4 1447}
5e5f3f0f 1448EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1449
95c385b4
NH		 1450int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1451 unsigned char banned_flags)
1da177e4
LT		 1452{
1453 struct inet6_dev *idev;
1454 int err = -EADDRNOTAVAIL;
1455
8814c4b5 1456 rcu_read_lock();
e21e8467
SH		 1457 idev = __in6_dev_get(dev);
1458 if (idev) {
1da177e4
LT		 1459 struct inet6_ifaddr *ifp;
1460
1461 read_lock_bh(&idev->lock);
502a2ffd 1462 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1463 if (ifp->scope == IFA_LINK &&
1464 !(ifp->flags & banned_flags)) {
4e3fd7a0 1465 *addr = ifp->addr;
1da177e4
LT		 1466 err = 0;
1467 break;
1468 }
1469 }
1470 read_unlock_bh(&idev->lock);
1471 }
8814c4b5 1472 rcu_read_unlock();
1da177e4
LT		 1473 return err;
1474}
1475
1476static int ipv6_count_addresses(struct inet6_dev *idev)
1477{
1478 int cnt = 0;
1479 struct inet6_ifaddr *ifp;
1480
1481 read_lock_bh(&idev->lock);
502a2ffd 1482 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1483 cnt++;
1484 read_unlock_bh(&idev->lock);
1485 return cnt;
1486}
1487
b71d1d42 1488int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1489 const struct net_device *dev, int strict)
1da177e4 1490{
eedf042a 1491 struct inet6_ifaddr *ifp;
ddbe5032 1492 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1493
5c578aed 1494 rcu_read_lock_bh();
b67bfe0d 1495 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1496 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1497 continue;
1da177e4 1498 if (ipv6_addr_equal(&ifp->addr, addr) &&
eedf042a
SH		 1499 !(ifp->flags&IFA_F_TENTATIVE) &&
1500 (dev == NULL || ifp->idev->dev == dev ||
1501 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1502 rcu_read_unlock_bh();
1503 return 1;
1da177e4
LT		 1504 }
1505 }
5c578aed 1506
eedf042a
SH		 1507 rcu_read_unlock_bh();
1508 return 0;
1da177e4 1509}
7159039a
YH		 1510EXPORT_SYMBOL(ipv6_chk_addr);
1511
3e81c6da
DM		 1512static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1513 struct net_device *dev)
1da177e4 1514{
ddbe5032 1515 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1516 struct inet6_ifaddr *ifp;
1da177e4 1517
b67bfe0d 1518 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1519 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1520 continue;
1da177e4
LT		 1521 if (ipv6_addr_equal(&ifp->addr, addr)) {
1522 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1523 return true;
1da177e4
LT		 1524 }
1525 }
3e81c6da 1526 return false;
1da177e4
LT		 1527}
1528
b71d1d42 1529int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1530{
1531 struct inet6_dev *idev;
1532 struct inet6_ifaddr *ifa;
1533 int onlink;
1534
1535 onlink = 0;
1536 rcu_read_lock();
1537 idev = __in6_dev_get(dev);
1538 if (idev) {
1539 read_lock_bh(&idev->lock);
502a2ffd 1540 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1541 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1542 ifa->prefix_len);
1543 if (onlink)
1544 break;
1545 }
1546 read_unlock_bh(&idev->lock);
1547 }
1548 rcu_read_unlock();
1549 return onlink;
1550}
52eeeb84
YH		 1551EXPORT_SYMBOL(ipv6_chk_prefix);
1552
9acd9f3a 1553struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1554 struct net_device *dev, int strict)
1da177e4 1555{
b79d1d54 1556 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1557 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1558
5c578aed 1559 rcu_read_lock_bh();
b67bfe0d 1560 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1561 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1562 continue;
1da177e4
LT		 1563 if (ipv6_addr_equal(&ifp->addr, addr)) {
1564 if (dev == NULL || ifp->idev->dev == dev ||
1565 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1566 result = ifp;
1da177e4
LT		 1567 in6_ifa_hold(ifp);
1568 break;
1569 }
1570 }
1571 }
5c578aed 1572 rcu_read_unlock_bh();
1da177e4 1573
b79d1d54 1574 return result;
1da177e4
LT		 1575}
1576
1da177e4
LT		 1577/* Gets referenced address, destroys ifaddr */
1578
cc411d0b 1579static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1580{
1da177e4
LT		 1581 if (ifp->flags&IFA_F_PERMANENT) {
1582 spin_lock_bh(&ifp->lock);
1583 addrconf_del_timer(ifp);
1584 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1585 if (dad_failed)
1586 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1587 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1588 if (dad_failed)
1589 ipv6_ifa_notify(0, ifp);
1da177e4
LT		 1590 in6_ifa_put(ifp);
1591#ifdef CONFIG_IPV6_PRIVACY
1592 } else if (ifp->flags&IFA_F_TEMPORARY) {
1593 struct inet6_ifaddr *ifpub;
1594 spin_lock_bh(&ifp->lock);
1595 ifpub = ifp->ifpub;
1596 if (ifpub) {
1597 in6_ifa_hold(ifpub);
1598 spin_unlock_bh(&ifp->lock);
1599 ipv6_create_tempaddr(ifpub, ifp);
1600 in6_ifa_put(ifpub);
1601 } else {
1602 spin_unlock_bh(&ifp->lock);
1603 }
1604 ipv6_del_addr(ifp);
1605#endif
1606 } else
1607 ipv6_del_addr(ifp);
1608}
1609
f2344a13
HX		 1610static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1611{
1612 int err = -ENOENT;
1613
1614 spin_lock(&ifp->state_lock);
1615 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1616 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1617 err = 0;
1618 }
1619 spin_unlock(&ifp->state_lock);
1620
1621 return err;
1622}
1623
3c21edbd
YH		 1624void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1625{
1b34be74 1626 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1627
853dc2e0
UB		 1628 if (addrconf_dad_end(ifp)) {
1629 in6_ifa_put(ifp);
f2344a13 1630 return;
853dc2e0 1631 }
f2344a13 1632
e87cc472
JP		 1633 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1634 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1635
1b34be74
YH		 1636 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1637 struct in6_addr addr;
1638
1639 addr.s6_addr32[0] = htonl(0xfe800000);
1640 addr.s6_addr32[1] = 0;
1641
1642 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1643 ipv6_addr_equal(&ifp->addr, &addr)) {
1644 /* DAD failed for link-local based on MAC address */
1645 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1646
f3213831 1647 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1648 ifp->idev->dev->name);
1b34be74
YH		 1649 }
1650 }
1651
cc411d0b 1652 addrconf_dad_stop(ifp, 1);
3c21edbd 1653}
1da177e4
LT		 1654
1655/* Join to solicited addr multicast group. */
1656
b71d1d42 1657void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1658{
1659 struct in6_addr maddr;
1660
1661 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1662 return;
1663
1664 addrconf_addr_solict_mult(addr, &maddr);
1665 ipv6_dev_mc_inc(dev, &maddr);
1666}
1667
b71d1d42 1668void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1669{
1670 struct in6_addr maddr;
1671
1672 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1673 return;
1674
1675 addrconf_addr_solict_mult(addr, &maddr);
1676 __ipv6_dev_mc_dec(idev, &maddr);
1677}
1678
20380731 1679static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1680{
1681 struct in6_addr addr;
2bda8a0c
BM		 1682 if (ifp->prefix_len == 127) /* RFC 6164 */
1683 return;
1da177e4
LT		 1684 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1685 if (ipv6_addr_any(&addr))
1686 return;
1687 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1688}
1689
20380731 1690static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1691{
1692 struct in6_addr addr;
32019e65
YH		 1693 if (ifp->prefix_len == 127) /* RFC 6164 */
1694 return;
1da177e4
LT		 1695 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1696 if (ipv6_addr_any(&addr))
1697 return;
1698 __ipv6_dev_ac_dec(ifp->idev, &addr);
1699}
1700
073a8e0e
YH		 1701static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1702{
1703 if (dev->addr_len != ETH_ALEN)
1704 return -1;
1705 memcpy(eui, dev->dev_addr, 3);
1706 memcpy(eui + 5, dev->dev_addr + 3, 3);
1707
1708 /*
1709 * The zSeries OSA network cards can be shared among various
1710 * OS instances, but the OSA cards have only one MAC address.
1711 * This leads to duplicate address conflicts in conjunction
1712 * with IPv6 if more than one instance uses the same card.
1713 *
1714 * The driver for these cards can deliver a unique 16-bit
1715 * identifier for each instance sharing the same card. It is
1716 * placed instead of 0xFFFE in the interface identifier. The
1717 * "u" bit of the interface identifier is not inverted in this
1718 * case. Hence the resulting interface identifier has local
1719 * scope according to RFC2373.
1720 */
1721 if (dev->dev_id) {
1722 eui[3] = (dev->dev_id >> 8) & 0xFF;
1723 eui[4] = dev->dev_id & 0xFF;
1724 } else {
1725 eui[3] = 0xFF;
1726 eui[4] = 0xFE;
1727 eui[0] ^= 2;
1728 }
1729 return 0;
1730}
1731
06a4c1c5 1732static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1733{
1734 if (dev->addr_len != IEEE802154_ADDR_LEN)
1735 return -1;
1736 memcpy(eui, dev->dev_addr, 8);
5e98a36e 1737 eui[0] ^= 2;
06a4c1c5 1738 return 0;
1739}
1740
cb6bf355
YH		 1741static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1742{
1743 union fwnet_hwaddr *ha;
1744
1745 if (dev->addr_len != FWNET_ALEN)
1746 return -1;
1747
1748 ha = (union fwnet_hwaddr *)dev->dev_addr;
1749
1750 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1751 eui[0] ^= 2;
1752 return 0;
1753}
1754
073a8e0e
YH		 1755static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1756{
1757 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1758 if (dev->addr_len != ARCNET_ALEN)
1759 return -1;
1760 memset(eui, 0, 7);
8e5e8f30 1761 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1762 return 0;
1763}
1764
1765static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1766{
1767 if (dev->addr_len != INFINIBAND_ALEN)
1768 return -1;
1769 memcpy(eui, dev->dev_addr + 12, 8);
1770 eui[0] |= 2;
1771 return 0;
1772}
1773
c61393ea 1774static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1775{
9af28511
SH		 1776 if (addr == 0)
1777 return -1;
dfd982ba
YH		 1778 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1779 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1780 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1781 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1782 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1783 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1784 eui[1] = 0;
1785 eui[2] = 0x5E;
1786 eui[3] = 0xFE;
1787 memcpy(eui + 4, &addr, 4);
1788 return 0;
1789}
dfd982ba
YH		 1790
1791static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1792{
1793 if (dev->priv_flags & IFF_ISATAP)
1794 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1795 return -1;
1796}
1797
aee80b54 1798static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1799{
1800 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1801}
1802
1da177e4
LT		 1803static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1804{
1805 switch (dev->type) {
1806 case ARPHRD_ETHER:
1807 case ARPHRD_FDDI:
073a8e0e 1808 return addrconf_ifid_eui48(eui, dev);
1da177e4 1809 case ARPHRD_ARCNET:
073a8e0e 1810 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1811 case ARPHRD_INFINIBAND:
073a8e0e 1812 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1813 case ARPHRD_SIT:
dfd982ba 1814 return addrconf_ifid_sit(eui, dev);
aee80b54 1815 case ARPHRD_IPGRE:
1816 return addrconf_ifid_gre(eui, dev);
06a4c1c5 1817 case ARPHRD_IEEE802154:
1818 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 1819 case ARPHRD_IEEE1394:
1820 return addrconf_ifid_ieee1394(eui, dev);
1da177e4
LT		 1821 }
1822 return -1;
1823}
1824
1825static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1826{
1827 int err = -1;
1828 struct inet6_ifaddr *ifp;
1829
1830 read_lock_bh(&idev->lock);
502a2ffd 1831 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 1832 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1833 memcpy(eui, ifp->addr.s6_addr+8, 8);
1834 err = 0;
1835 break;
1836 }
1837 }
1838 read_unlock_bh(&idev->lock);
1839 return err;
1840}
1841
1842#ifdef CONFIG_IPV6_PRIVACY
1843/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 1844static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 1845{
1da177e4 1846regen:
955189ef 1847 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1848 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1849
1850 /*
1851 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1852 * check if generated address is not inappropriate
1853 *
1854 * - Reserved subnet anycast (RFC 2526)
1855 * 11111101 11....11 1xxxxxxx
c7dc89c0 1856 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1857 * 00-00-5E-FE-xx-xx-xx-xx
1858 * - value 0
1859 * - XXX: already assigned to an address on the device
1860 */
1ab1457c 1861 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1862 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1863 (idev->rndid[7]&0x80))
1864 goto regen;
1865 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1866 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1867 goto regen;
1868 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1869 goto regen;
1870 }
1da177e4
LT		 1871}
1872
1873static void ipv6_regen_rndid(unsigned long data)
1874{
1875 struct inet6_dev *idev = (struct inet6_dev *) data;
1876 unsigned long expires;
1877
8814c4b5 1878 rcu_read_lock_bh();
1da177e4
LT		 1879 write_lock_bh(&idev->lock);
1880
1881 if (idev->dead)
1882 goto out;
1883
eb7e0575 1884 __ipv6_regen_rndid(idev);
1ab1457c 1885
1da177e4 1886 expires = jiffies +
1ab1457c 1887 idev->cnf.temp_prefered_lft * HZ -
784e2710
BH		 1888 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1889 idev->cnf.max_desync_factor * HZ;
1da177e4 1890 if (time_before(expires, jiffies)) {
f3213831
JP		 1891 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1892 __func__, idev->dev->name);
1da177e4
LT		 1893 goto out;
1894 }
1895
1896 if (!mod_timer(&idev->regen_timer, expires))
1897 in6_dev_hold(idev);
1898
1899out:
1900 write_unlock_bh(&idev->lock);
8814c4b5 1901 rcu_read_unlock_bh();
1da177e4
LT		 1902 in6_dev_put(idev);
1903}
1904
eb7e0575 1905static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 1906{
1da177e4 1907 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 1908 __ipv6_regen_rndid(idev);
1da177e4
LT		 1909}
1910#endif
1911
1912/*
1913 * Add prefix route.
1914 */
1915
1916static void
1917addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1918 unsigned long expires, u32 flags)
1da177e4 1919{
86872cb5
TG		 1920 struct fib6_config cfg = {
1921 .fc_table = RT6_TABLE_PREFIX,
1922 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1923 .fc_ifindex = dev->ifindex,
1924 .fc_expires = expires,
1925 .fc_dst_len = plen,
1926 .fc_flags = RTF_UP | flags,
c346dca1 1927 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1928 .fc_protocol = RTPROT_KERNEL,
86872cb5 1929 };
1da177e4 1930
4e3fd7a0 1931 cfg.fc_dst = *pfx;
1da177e4
LT		 1932
1933 /* Prevent useless cloning on PtP SIT.
1934 This thing is done here expecting that the whole
1935 class of non-broadcast devices need not cloning.
1936 */
07a93626 1937#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 1938 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1939 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1940#endif
1da177e4 1941
86872cb5 1942 ip6_route_add(&cfg);
1da177e4
LT		 1943}
1944
14ef37b6
AH		 1945
1946static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1947 int plen,
1948 const struct net_device *dev,
1949 u32 flags, u32 noflags)
1950{
1951 struct fib6_node *fn;
1952 struct rt6_info *rt = NULL;
1953 struct fib6_table *table;
1954
1955 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1956 if (table == NULL)
1957 return NULL;
1958
5744dd9b 1959 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 1960 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1961 if (!fn)
1962 goto out;
1963 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 1964 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 1965 continue;
1966 if ((rt->rt6i_flags & flags) != flags)
1967 continue;
85da53bf 1968 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 1969 continue;
1970 dst_hold(&rt->dst);
1971 break;
1972 }
1973out:
5744dd9b 1974 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 1975 return rt;
1976}
1977
1978
1da177e4
LT		 1979/* Create "default" multicast route to the interface */
1980
1981static void addrconf_add_mroute(struct net_device *dev)
1982{
86872cb5
TG		 1983 struct fib6_config cfg = {
1984 .fc_table = RT6_TABLE_LOCAL,
1985 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1986 .fc_ifindex = dev->ifindex,
1987 .fc_dst_len = 8,
1988 .fc_flags = RTF_UP,
c346dca1 1989 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1990 };
1991
1992 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1993
1994 ip6_route_add(&cfg);
1da177e4
LT		 1995}
1996
07a93626 1997#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 1998static void sit_route_add(struct net_device *dev)
1999{
86872cb5
TG		 2000 struct fib6_config cfg = {
2001 .fc_table = RT6_TABLE_MAIN,
2002 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2003 .fc_ifindex = dev->ifindex,
2004 .fc_dst_len = 96,
2005 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 2006 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 2007 };
1da177e4
LT		 2008
2009 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 2010 ip6_route_add(&cfg);
1da177e4 2011}
0be669bb 2012#endif
1da177e4 2013
1da177e4
LT		 2014static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2015{
2016 struct inet6_dev *idev;
2017
2018 ASSERT_RTNL();
2019
e21e8467
SH		 2020 idev = ipv6_find_idev(dev);
2021 if (!idev)
64e724f6
BH		 2022 return ERR_PTR(-ENOBUFS);
2023
2024 if (idev->cnf.disable_ipv6)
2025 return ERR_PTR(-EACCES);
1da177e4
LT		 2026
2027 /* Add default multicast route */
4af04aba
LW		 2028 if (!(dev->flags & IFF_LOOPBACK))
2029 addrconf_add_mroute(dev);
1da177e4 2030
1da177e4
LT		 2031 return idev;
2032}
2033
e6bff995 2034void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2035{
2036 struct prefix_info *pinfo;
2037 __u32 valid_lft;
2038 __u32 prefered_lft;
2039 int addr_type;
1da177e4 2040 struct inet6_dev *in6_dev;
56d417b1 2041 struct net *net = dev_net(dev);
1da177e4
LT		 2042
2043 pinfo = (struct prefix_info *) opt;
1ab1457c 2044
1da177e4
LT		 2045 if (len < sizeof(struct prefix_info)) {
2046 ADBG(("addrconf: prefix option too short\n"));
2047 return;
2048 }
1ab1457c 2049
1da177e4
LT		 2050 /*
2051 * Validation checks ([ADDRCONF], page 19)
2052 */
2053
2054 addr_type = ipv6_addr_type(&pinfo->prefix);
2055
2056 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2057 return;
2058
2059 valid_lft = ntohl(pinfo->valid);
2060 prefered_lft = ntohl(pinfo->prefered);
2061
2062 if (prefered_lft > valid_lft) {
e87cc472 2063 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2064 return;
2065 }
2066
2067 in6_dev = in6_dev_get(dev);
2068
2069 if (in6_dev == NULL) {
e87cc472
JP		 2070 net_dbg_ratelimited("addrconf: device %s not configured\n",
2071 dev->name);
1da177e4
LT		 2072 return;
2073 }
2074
2075 /*
2076 * Two things going on here:
2077 * 1) Add routes for on-link prefixes
2078 * 2) Configure prefixes with the auto flag set
2079 */
2080
4bed72e4
YH		 2081 if (pinfo->onlink) {
2082 struct rt6_info *rt;
2083 unsigned long rt_expires;
2084
6f704992
YH		 2085 /* Avoid arithmetic overflow. Really, we could
2086 * save rt_expires in seconds, likely valid_lft,
2087 * but it would require division in fib gc, that it
2088 * not good.
2089 */
4bed72e4
YH		 2090 if (HZ > USER_HZ)
2091 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2092 else
2093 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2094
4bed72e4
YH		 2095 if (addrconf_finite_timeout(rt_expires))
2096 rt_expires *= HZ;
1da177e4 2097
14ef37b6
AH		 2098 rt = addrconf_get_prefix_route(&pinfo->prefix,
2099 pinfo->prefix_len,
2100 dev,
2101 RTF_ADDRCONF | RTF_PREFIX_RT,
2102 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2103
14ef37b6 2104 if (rt) {
6f704992
YH		 2105 /* Autoconf prefix route */
2106 if (valid_lft == 0) {
2107 ip6_del_rt(rt);
2108 rt = NULL;
4bed72e4 2109 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2110 /* not infinity */
1716a961 2111 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2112 } else {
1716a961 2113 rt6_clean_expires(rt);
1da177e4
LT		 2114 }
2115 } else if (valid_lft) {
6f704992 2116 clock_t expires = 0;
4bed72e4
YH		 2117 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2118 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2119 /* not infinity */
2120 flags |= RTF_EXPIRES;
2121 expires = jiffies_to_clock_t(rt_expires);
2122 }
1da177e4 2123 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2124 dev, expires, flags);
1da177e4 2125 }
94e187c0 2126 ip6_rt_put(rt);
1da177e4
LT		 2127 }
2128
2129 /* Try to figure out our local address for this prefix */
2130
2131 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2132 struct inet6_ifaddr *ifp;
1da177e4
LT		 2133 struct in6_addr addr;
2134 int create = 0, update_lft = 0;
617fe29d 2135 bool tokenized = false;
1da177e4
LT		 2136
2137 if (pinfo->prefix_len == 64) {
2138 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2139
2140 if (!ipv6_addr_any(&in6_dev->token)) {
2141 read_lock_bh(&in6_dev->lock);
2142 memcpy(addr.s6_addr + 8,
2143 in6_dev->token.s6_addr + 8, 8);
2144 read_unlock_bh(&in6_dev->lock);
617fe29d 2145 tokenized = true;
f53adae4
DB		 2146 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2147 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1da177e4
LT		 2148 in6_dev_put(in6_dev);
2149 return;
2150 }
2151 goto ok;
2152 }
e87cc472
JP		 2153 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2154 pinfo->prefix_len);
1da177e4
LT		 2155 in6_dev_put(in6_dev);
2156 return;
2157
2158ok:
2159
53b7997f 2160 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 2161
2162 if (ifp == NULL && valid_lft) {
2163 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2164 u32 addr_flags = 0;
2165
2166#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2167 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2168 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 2169 addr_flags = IFA_F_OPTIMISTIC;
2170#endif
1da177e4
LT		 2171
2172 /* Do not allow to create too much of autoconfigured
2173 * addresses; this would be too easy way to crash kernel.
2174 */
2175 if (!max_addresses ||
2176 ipv6_count_addresses(in6_dev) < max_addresses)
2177 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 2178 addr_type&IPV6_ADDR_SCOPE_MASK,
2179 addr_flags);
1da177e4 2180
3f0d2ba0 2181 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2182 in6_dev_put(in6_dev);
2183 return;
2184 }
2185
2186 update_lft = create = 1;
2187 ifp->cstamp = jiffies;
617fe29d 2188 ifp->tokenized = tokenized;
cf22f9a2 2189 addrconf_dad_start(ifp);
1da177e4
LT		 2190 }
2191
2192 if (ifp) {
2193 int flags;
2194 unsigned long now;
2195#ifdef CONFIG_IPV6_PRIVACY
2196 struct inet6_ifaddr *ift;
2197#endif
2198 u32 stored_lft;
2199
2200 /* update lifetime (RFC2462 5.5.3 e) */
2201 spin_lock(&ifp->lock);
2202 now = jiffies;
2203 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2204 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2205 else
2206 stored_lft = 0;
2207 if (!update_lft && stored_lft) {
2208 if (valid_lft > MIN_VALID_LIFETIME ||
2209 valid_lft > stored_lft)
2210 update_lft = 1;
2211 else if (stored_lft <= MIN_VALID_LIFETIME) {
2212 /* valid_lft <= stored_lft is always true */
a1ed0526
BH		 2213 /*
2214 * RFC 4862 Section 5.5.3e:
2215 * "Note that the preferred lifetime of
2216 * the corresponding address is always
2217 * reset to the Preferred Lifetime in
2218 * the received Prefix Information
2219 * option, regardless of whether the
2220 * valid lifetime is also reset or
2221 * ignored."
2222 *
2223 * So if the preferred lifetime in
2224 * this advertisement is different
2225 * than what we have stored, but the
2226 * valid lifetime is invalid, just
2227 * reset prefered_lft.
2228 *
2229 * We must set the valid lifetime
2230 * to the stored lifetime since we'll
2231 * be updating the timestamp below,
2232 * else we'll set it back to the
25985edc 2233 * minimum.
a1ed0526
BH		 2234 */
2235 if (prefered_lft != ifp->prefered_lft) {
2236 valid_lft = stored_lft;
2237 update_lft = 1;
2238 }
1da177e4
LT		 2239 } else {
2240 valid_lft = MIN_VALID_LIFETIME;
2241 if (valid_lft < prefered_lft)
2242 prefered_lft = valid_lft;
2243 update_lft = 1;
2244 }
2245 }
2246
2247 if (update_lft) {
2248 ifp->valid_lft = valid_lft;
2249 ifp->prefered_lft = prefered_lft;
2250 ifp->tstamp = now;
2251 flags = ifp->flags;
2252 ifp->flags &= ~IFA_F_DEPRECATED;
2253 spin_unlock(&ifp->lock);
2254
2255 if (!(flags&IFA_F_TENTATIVE))
2256 ipv6_ifa_notify(0, ifp);
2257 } else
2258 spin_unlock(&ifp->lock);
2259
2260#ifdef CONFIG_IPV6_PRIVACY
2261 read_lock_bh(&in6_dev->lock);
2262 /* update all temporary addresses in the list */
76f793e3
LC		 2263 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2264 tmp_list) {
2265 int age, max_valid, max_prefered;
2266
c6fbfac2
BB		 2267 if (ifp != ift->ifpub)
2268 continue;
2269
76f793e3
LC		 2270 /*
2271 * RFC 4941 section 3.3:
2272 * If a received option will extend the lifetime
2273 * of a public address, the lifetimes of
2274 * temporary addresses should be extended,
2275 * subject to the overall constraint that no
2276 * temporary addresses should ever remain
2277 * "valid" or "preferred" for a time longer than
2278 * (TEMP_VALID_LIFETIME) or
2279 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2280 * respectively.
2281 */
2282 age = (now - ift->cstamp) / HZ;
2283 max_valid = in6_dev->cnf.temp_valid_lft - age;
2284 if (max_valid < 0)
2285 max_valid = 0;
2286
2287 max_prefered = in6_dev->cnf.temp_prefered_lft -
2288 in6_dev->cnf.max_desync_factor -
2289 age;
2290 if (max_prefered < 0)
2291 max_prefered = 0;
2292
2293 if (valid_lft > max_valid)
2294 valid_lft = max_valid;
2295
2296 if (prefered_lft > max_prefered)
2297 prefered_lft = max_prefered;
2298
1da177e4
LT		 2299 spin_lock(&ift->lock);
2300 flags = ift->flags;
76f793e3
LC		 2301 ift->valid_lft = valid_lft;
2302 ift->prefered_lft = prefered_lft;
2303 ift->tstamp = now;
2304 if (prefered_lft > 0)
2305 ift->flags &= ~IFA_F_DEPRECATED;
2306
1da177e4
LT		 2307 spin_unlock(&ift->lock);
2308 if (!(flags&IFA_F_TENTATIVE))
2309 ipv6_ifa_notify(0, ift);
2310 }
2311
aed65501 2312 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
1da177e4 2313 /*
76f793e3
LC		 2314 * When a new public address is created as
2315 * described in [ADDRCONF], also create a new
2316 * temporary address. Also create a temporary
2317 * address if it's enabled but no temporary
2318 * address currently exists.
1da177e4 2319 */
1ab1457c 2320 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 2321 ipv6_create_tempaddr(ifp, NULL);
2322 } else {
2323 read_unlock_bh(&in6_dev->lock);
2324 }
2325#endif
2326 in6_ifa_put(ifp);
2327 addrconf_verify(0);
2328 }
2329 }
2330 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2331 in6_dev_put(in6_dev);
2332}
2333
2334/*
2335 * Set destination address.
2336 * Special case for SIT interfaces where we create a new "virtual"
2337 * device.
2338 */
af284937 2339int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2340{
2341 struct in6_ifreq ireq;
2342 struct net_device *dev;
2343 int err = -EINVAL;
2344
2345 rtnl_lock();
2346
2347 err = -EFAULT;
2348 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2349 goto err_exit;
2350
af284937 2351 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2352
2353 err = -ENODEV;
2354 if (dev == NULL)
2355 goto err_exit;
2356
07a93626 2357#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2358 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2359 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2360 struct ifreq ifr;
1da177e4
LT		 2361 struct ip_tunnel_parm p;
2362
2363 err = -EADDRNOTAVAIL;
2364 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2365 goto err_exit;
2366
2367 memset(&p, 0, sizeof(p));
2368 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2369 p.iph.saddr = 0;
2370 p.iph.version = 4;
2371 p.iph.ihl = 5;
2372 p.iph.protocol = IPPROTO_IPV6;
2373 p.iph.ttl = 64;
d20b3109 2374 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2375
5bc3eb7e
SH		 2376 if (ops->ndo_do_ioctl) {
2377 mm_segment_t oldfs = get_fs();
2378
2379 set_fs(KERNEL_DS);
2380 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2381 set_fs(oldfs);
2382 } else
2383 err = -EOPNOTSUPP;
1da177e4
LT		 2384
2385 if (err == 0) {
2386 err = -ENOBUFS;
af284937
DL		 2387 dev = __dev_get_by_name(net, p.name);
2388 if (!dev)
1da177e4
LT		 2389 goto err_exit;
2390 err = dev_open(dev);
2391 }
2392 }
0be669bb 2393#endif
1da177e4
LT		 2394
2395err_exit:
2396 rtnl_unlock();
2397 return err;
2398}
2399
2400/*
2401 * Manual configuration of address on an interface
2402 */
b71d1d42 2403static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
caeaba79 2404 const struct in6_addr *peer_pfx,
24ef0da7 2405 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2406 __u32 valid_lft)
1da177e4
LT		 2407{
2408 struct inet6_ifaddr *ifp;
2409 struct inet6_dev *idev;
2410 struct net_device *dev;
2411 int scope;
6f704992
YH		 2412 u32 flags;
2413 clock_t expires;
4bed72e4 2414 unsigned long timeout;
1da177e4
LT		 2415
2416 ASSERT_RTNL();
1ab1457c 2417
24ef0da7
TG		 2418 if (plen > 128)
2419 return -EINVAL;
2420
0778769d
NT		 2421 /* check the lifetime */
2422 if (!valid_lft || prefered_lft > valid_lft)
2423 return -EINVAL;
2424
af284937
DL		 2425 dev = __dev_get_by_index(net, ifindex);
2426 if (!dev)
1da177e4 2427 return -ENODEV;
1ab1457c 2428
64e724f6
BH		 2429 idev = addrconf_add_dev(dev);
2430 if (IS_ERR(idev))
2431 return PTR_ERR(idev);
1da177e4
LT		 2432
2433 scope = ipv6_addr_scope(pfx);
2434
4bed72e4
YH		 2435 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2436 if (addrconf_finite_timeout(timeout)) {
2437 expires = jiffies_to_clock_t(timeout * HZ);
2438 valid_lft = timeout;
6f704992 2439 flags = RTF_EXPIRES;
4bed72e4
YH		 2440 } else {
2441 expires = 0;
2442 flags = 0;
2443 ifa_flags |= IFA_F_PERMANENT;
6f704992 2444 }
0778769d 2445
4bed72e4
YH		 2446 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2447 if (addrconf_finite_timeout(timeout)) {
2448 if (timeout == 0)
2449 ifa_flags |= IFA_F_DEPRECATED;
2450 prefered_lft = timeout;
2451 }
0778769d
NT		 2452
2453 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2454
1da177e4 2455 if (!IS_ERR(ifp)) {
06aebfb7 2456 spin_lock_bh(&ifp->lock);
0778769d
NT		 2457 ifp->valid_lft = valid_lft;
2458 ifp->prefered_lft = prefered_lft;
2459 ifp->tstamp = jiffies;
caeaba79
ND		 2460 if (peer_pfx)
2461 ifp->peer_addr = *peer_pfx;
06aebfb7 2462 spin_unlock_bh(&ifp->lock);
0778769d 2463
46d48046 2464 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2465 expires, flags);
95c385b4
NH		 2466 /*
2467 * Note that section 3.1 of RFC 4429 indicates
2468 * that the Optimistic flag should not be set for
2469 * manually configured addresses
2470 */
cf22f9a2 2471 addrconf_dad_start(ifp);
1da177e4 2472 in6_ifa_put(ifp);
0778769d 2473 addrconf_verify(0);
1da177e4
LT		 2474 return 0;
2475 }
2476
2477 return PTR_ERR(ifp);
2478}
2479
b71d1d42 2480static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2481 unsigned int plen)
1da177e4
LT		 2482{
2483 struct inet6_ifaddr *ifp;
2484 struct inet6_dev *idev;
2485 struct net_device *dev;
1ab1457c 2486
24ef0da7
TG		 2487 if (plen > 128)
2488 return -EINVAL;
2489
af284937
DL		 2490 dev = __dev_get_by_index(net, ifindex);
2491 if (!dev)
1da177e4
LT		 2492 return -ENODEV;
2493
2494 if ((idev = __in6_dev_get(dev)) == NULL)
2495 return -ENXIO;
2496
2497 read_lock_bh(&idev->lock);
502a2ffd 2498 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2499 if (ifp->prefix_len == plen &&
2500 ipv6_addr_equal(pfx, &ifp->addr)) {
2501 in6_ifa_hold(ifp);
2502 read_unlock_bh(&idev->lock);
1ab1457c 2503
1da177e4
LT		 2504 ipv6_del_addr(ifp);
2505
2506 /* If the last address is deleted administratively,
2507 disable IPv6 on this interface.
2508 */
502a2ffd 2509 if (list_empty(&idev->addr_list))
1da177e4
LT		 2510 addrconf_ifdown(idev->dev, 1);
2511 return 0;
2512 }
2513 }
2514 read_unlock_bh(&idev->lock);
2515 return -EADDRNOTAVAIL;
2516}
2517
2518
af284937 2519int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2520{
2521 struct in6_ifreq ireq;
2522 int err;
1ab1457c 2523
af31f412 2524 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2525 return -EPERM;
1ab1457c 2526
1da177e4
LT		 2527 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2528 return -EFAULT;
2529
2530 rtnl_lock();
caeaba79 2531 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2532 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2533 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2534 rtnl_unlock();
2535 return err;
2536}
2537
af284937 2538int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2539{
2540 struct in6_ifreq ireq;
2541 int err;
1ab1457c 2542
af31f412 2543 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2544 return -EPERM;
2545
2546 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2547 return -EFAULT;
2548
2549 rtnl_lock();
af284937
DL		 2550 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2551 ireq.ifr6_prefixlen);
1da177e4
LT		 2552 rtnl_unlock();
2553 return err;
2554}
2555
b5f348e5
IJ		 2556static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2557 int plen, int scope)
2558{
2559 struct inet6_ifaddr *ifp;
2560
2561 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2562 if (!IS_ERR(ifp)) {
2563 spin_lock_bh(&ifp->lock);
2564 ifp->flags &= ~IFA_F_TENTATIVE;
2565 spin_unlock_bh(&ifp->lock);
2566 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2567 in6_ifa_put(ifp);
2568 }
2569}
2570
07a93626 2571#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2572static void sit_add_v4_addrs(struct inet6_dev *idev)
2573{
1da177e4
LT		 2574 struct in6_addr addr;
2575 struct net_device *dev;
c346dca1 2576 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2577 int scope;
2578
2579 ASSERT_RTNL();
2580
2581 memset(&addr, 0, sizeof(struct in6_addr));
2582 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2583
2584 if (idev->dev->flags&IFF_POINTOPOINT) {
2585 addr.s6_addr32[0] = htonl(0xfe800000);
2586 scope = IFA_LINK;
2587 } else {
2588 scope = IPV6_ADDR_COMPATv4;
2589 }
2590
2591 if (addr.s6_addr32[3]) {
b5f348e5 2592 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2593 return;
2594 }
2595
6fda7350 2596 for_each_netdev(net, dev) {
8e5e8f30 2597 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2598 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2599 struct in_ifaddr *ifa;
1da177e4
LT		 2600
2601 int flag = scope;
2602
2603 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2604 int plen;
2605
2606 addr.s6_addr32[3] = ifa->ifa_local;
2607
2608 if (ifa->ifa_scope == RT_SCOPE_LINK)
2609 continue;
2610 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2611 if (idev->dev->flags&IFF_POINTOPOINT)
2612 continue;
2613 flag |= IFA_HOST;
2614 }
2615 if (idev->dev->flags&IFF_POINTOPOINT)
2616 plen = 64;
2617 else
2618 plen = 96;
2619
b5f348e5 2620 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2621 }
2622 }
1ab1457c 2623 }
1da177e4 2624}
0be669bb 2625#endif
1da177e4
LT		 2626
2627static void init_loopback(struct net_device *dev)
2628{
2629 struct inet6_dev *idev;
25fb6ca4
BK		 2630 struct net_device *sp_dev;
2631 struct inet6_ifaddr *sp_ifa;
2632 struct rt6_info *sp_rt;
1da177e4
LT		 2633
2634 /* ::1 */
2635
2636 ASSERT_RTNL();
2637
2638 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2639 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2640 return;
2641 }
2642
b5f348e5 2643 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2644
2645 /* Add routes to other interface's IPv6 addresses */
2646 for_each_netdev(dev_net(dev), sp_dev) {
2647 if (!strcmp(sp_dev->name, dev->name))
2648 continue;
2649
2650 idev = __in6_dev_get(sp_dev);
2651 if (!idev)
2652 continue;
2653
2654 read_lock_bh(&idev->lock);
2655 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2656
2657 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2658 continue;
2659
2660 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
2661
2662 /* Failure cases are ignored */
534c8779
G		 2663 if (!IS_ERR(sp_rt)) {
2664 sp_ifa->rt = sp_rt;
25fb6ca4 2665 ip6_ins_rt(sp_rt);
534c8779 2666 }
25fb6ca4
BK		 2667 }
2668 read_unlock_bh(&idev->lock);
2669 }
1da177e4
LT		 2670}
2671
b71d1d42 2672static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4 2673{
8e5e8f30 2674 struct inet6_ifaddr *ifp;
95c385b4
NH		 2675 u32 addr_flags = IFA_F_PERMANENT;
2676
2677#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2678 if (idev->cnf.optimistic_dad &&
702beb87 2679 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2680 addr_flags |= IFA_F_OPTIMISTIC;
2681#endif
1da177e4 2682
95c385b4
NH		 2683
2684 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2685 if (!IS_ERR(ifp)) {
46d48046 2686 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2687 addrconf_dad_start(ifp);
1da177e4
LT		 2688 in6_ifa_put(ifp);
2689 }
2690}
2691
2692static void addrconf_dev_config(struct net_device *dev)
2693{
2694 struct in6_addr addr;
8e5e8f30 2695 struct inet6_dev *idev;
1da177e4
LT		 2696
2697 ASSERT_RTNL();
2698
74235a25
HX		 2699 if ((dev->type != ARPHRD_ETHER) &&
2700 (dev->type != ARPHRD_FDDI) &&
74235a25 2701 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 2702 (dev->type != ARPHRD_INFINIBAND) &&
cb6bf355
YH		 2703 (dev->type != ARPHRD_IEEE802154) &&
2704 (dev->type != ARPHRD_IEEE1394)) {
74235a25
HX		 2705 /* Alas, we support only Ethernet autoconfiguration. */
2706 return;
2707 }
2708
1da177e4 2709 idev = addrconf_add_dev(dev);
64e724f6 2710 if (IS_ERR(idev))
1da177e4
LT		 2711 return;
2712
2713 memset(&addr, 0, sizeof(struct in6_addr));
2714 addr.s6_addr32[0] = htonl(0xFE800000);
2715
2716 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2717 addrconf_add_linklocal(idev, &addr);
2718}
2719
07a93626 2720#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2721static void addrconf_sit_config(struct net_device *dev)
2722{
2723 struct inet6_dev *idev;
2724
2725 ASSERT_RTNL();
2726
1ab1457c
YH		 2727 /*
2728 * Configure the tunnel with one of our IPv4
2729 * addresses... we should configure all of
1da177e4
LT		 2730 * our v4 addrs in the tunnel
2731 */
2732
2733 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2734 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2735 return;
2736 }
2737
c7dc89c0
FT		 2738 if (dev->priv_flags & IFF_ISATAP) {
2739 struct in6_addr addr;
2740
2741 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2742 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2743 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2744 addrconf_add_linklocal(idev, &addr);
2745 return;
2746 }
2747
1da177e4
LT		 2748 sit_add_v4_addrs(idev);
2749
62b54dd9 2750 if (dev->flags&IFF_POINTOPOINT)
1da177e4 2751 addrconf_add_mroute(dev);
62b54dd9 2752 else
1da177e4
LT		 2753 sit_route_add(dev);
2754}
0be669bb 2755#endif
1da177e4 2756
07a93626 2757#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2758static void addrconf_gre_config(struct net_device *dev)
2759{
2760 struct inet6_dev *idev;
2761 struct in6_addr addr;
2762
f3213831 2763 pr_info("%s(%s)\n", __func__, dev->name);
aee80b54 2764
2765 ASSERT_RTNL();
2766
2767 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2768 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 2769 return;
2770 }
2771
2772 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2773 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2774
2775 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2776 addrconf_add_linklocal(idev, &addr);
2777}
2778#endif
2779
1da177e4
LT		 2780static inline int
2781ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2782{
2783 struct in6_addr lladdr;
2784
95c385b4 2785 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2786 addrconf_add_linklocal(idev, &lladdr);
2787 return 0;
2788 }
2789 return -1;
2790}
2791
2792static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2793{
2794 struct net_device *link_dev;
c346dca1 2795 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2796
2797 /* first try to inherit the link-local address from the link device */
2798 if (idev->dev->iflink &&
6fda7350 2799 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2800 if (!ipv6_inherit_linklocal(idev, link_dev))
2801 return;
2802 }
2803 /* then try to inherit it from any device */
6fda7350 2804 for_each_netdev(net, link_dev) {
1da177e4
LT		 2805 if (!ipv6_inherit_linklocal(idev, link_dev))
2806 return;
2807 }
91df42be 2808 pr_debug("init ip6-ip6: add_linklocal failed\n");
1da177e4
LT		 2809}
2810
2811/*
2812 * Autoconfigure tunnel with a link-local address so routing protocols,
2813 * DHCPv6, MLD etc. can be run over the virtual link
2814 */
2815
2816static void addrconf_ip6_tnl_config(struct net_device *dev)
2817{
2818 struct inet6_dev *idev;
2819
2820 ASSERT_RTNL();
2821
e21e8467 2822 idev = addrconf_add_dev(dev);
64e724f6 2823 if (IS_ERR(idev)) {
91df42be 2824 pr_debug("init ip6-ip6: add_dev failed\n");
1da177e4
LT		 2825 return;
2826 }
2827 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2828}
2829
1ab1457c 2830static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 2831 void *ptr)
1da177e4 2832{
351638e7 2833 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 2834 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2835 int run_pending = 0;
b217d616 2836 int err;
1da177e4 2837
e21e8467 2838 switch (event) {
45ba9dd2 2839 case NETDEV_REGISTER:
74235a25 2840 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2841 idev = ipv6_add_dev(dev);
2842 if (!idev)
b217d616 2843 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2844 }
2845 break;
bcdd553f 2846
1da177e4 2847 case NETDEV_UP:
3c21edbd 2848 case NETDEV_CHANGE:
c2edacf8
JV		 2849 if (dev->flags & IFF_SLAVE)
2850 break;
2851
3c21edbd 2852 if (event == NETDEV_UP) {
f24e3d65 2853 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 2854 /* device is not ready yet. */
f3213831 2855 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 2856 dev->name);
2857 break;
2858 }
99081049 2859
d31c7b8f
EP		 2860 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2861 idev = ipv6_add_dev(dev);
2862
e3ec6cfc 2863 if (idev) {
99081049 2864 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2865 run_pending = 1;
2866 }
3c21edbd 2867 } else {
f24e3d65 2868 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2869 /* device is still not ready. */
2870 break;
2871 }
2872
2873 if (idev) {
bcdd553f 2874 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2875 /* device is already configured. */
2876 break;
3c21edbd
YH		 2877 idev->if_flags |= IF_READY;
2878 }
2879
f3213831
JP		 2880 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2881 dev->name);
3c21edbd 2882
c5e33bdd 2883 run_pending = 1;
3c21edbd
YH		 2884 }
2885
e21e8467 2886 switch (dev->type) {
07a93626 2887#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2888 case ARPHRD_SIT:
2889 addrconf_sit_config(dev);
2890 break;
aee80b54 2891#endif
07a93626 2892#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2893 case ARPHRD_IPGRE:
2894 addrconf_gre_config(dev);
2895 break;
0be669bb 2896#endif
1da177e4
LT		 2897 case ARPHRD_TUNNEL6:
2898 addrconf_ip6_tnl_config(dev);
2899 break;
2900 case ARPHRD_LOOPBACK:
2901 init_loopback(dev);
2902 break;
2903
2904 default:
2905 addrconf_dev_config(dev);
2906 break;
3ff50b79 2907 }
bcdd553f 2908
1da177e4 2909 if (idev) {
c5e33bdd
YH		 2910 if (run_pending)
2911 addrconf_dad_run(idev);
2912
bcdd553f
SH		 2913 /*
2914 * If the MTU changed during the interface down,
2915 * when the interface up, the changed MTU must be
2916 * reflected in the idev as well as routers.
1da177e4 2917 */
bcdd553f
SH		 2918 if (idev->cnf.mtu6 != dev->mtu &&
2919 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2920 rt6_mtu_change(dev, dev->mtu);
2921 idev->cnf.mtu6 = dev->mtu;
2922 }
2923 idev->tstamp = jiffies;
2924 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2925
2926 /*
2927 * If the changed mtu during down is lower than
2928 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2929 */
2930 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2931 addrconf_ifdown(dev, 1);
1da177e4
LT		 2932 }
2933 break;
2934
2935 case NETDEV_CHANGEMTU:
d31c7b8f 2936 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2937 rt6_mtu_change(dev, dev->mtu);
2938 idev->cnf.mtu6 = dev->mtu;
2939 break;
2940 }
2941
d31c7b8f
EP		 2942 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2943 idev = ipv6_add_dev(dev);
2944 if (idev)
2945 break;
2946 }
2947
bcdd553f
SH		 2948 /*
2949 * MTU falled under IPV6_MIN_MTU.
2950 * Stop IPv6 on this interface.
2951 */
1da177e4
LT		 2952
2953 case NETDEV_DOWN:
2954 case NETDEV_UNREGISTER:
2955 /*
2956 * Remove all addresses from this interface.
2957 */
2958 addrconf_ifdown(dev, event != NETDEV_DOWN);
2959 break;
3c21edbd 2960
1da177e4 2961 case NETDEV_CHANGENAME:
1da177e4 2962 if (idev) {
5632c515 2963 snmp6_unregister_dev(idev);
408c4768 2964 addrconf_sysctl_unregister(idev);
f52295a9 2965 addrconf_sysctl_register(idev);
b217d616
HX		 2966 err = snmp6_register_dev(idev);
2967 if (err)
2968 return notifier_from_errno(err);
5632c515 2969 }
1da177e4 2970 break;
bcdd553f 2971
93d9b7d7
JP		 2972 case NETDEV_PRE_TYPE_CHANGE:
2973 case NETDEV_POST_TYPE_CHANGE:
2974 addrconf_type_change(dev, event);
75c78500 2975 break;
3ff50b79 2976 }
1da177e4
LT		 2977
2978 return NOTIFY_OK;
2979}
2980
2981/*
2982 * addrconf module should be notified of a device going up
2983 */
2984static struct notifier_block ipv6_dev_notf = {
2985 .notifier_call = addrconf_notify,
1da177e4
LT		 2986};
2987
93d9b7d7 2988static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2989{
2990 struct inet6_dev *idev;
2991 ASSERT_RTNL();
2992
2993 idev = __in6_dev_get(dev);
2994
93d9b7d7 2995 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2996 ipv6_mc_remap(idev);
93d9b7d7 2997 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2998 ipv6_mc_unmap(idev);
2999}
3000
1da177e4
LT		 3001static int addrconf_ifdown(struct net_device *dev, int how)
3002{
c346dca1 3003 struct net *net = dev_net(dev);
502a2ffd 3004 struct inet6_dev *idev;
3005 struct inet6_ifaddr *ifa;
73a8bd74 3006 int state, i;
1da177e4
LT		 3007
3008 ASSERT_RTNL();
3009
73a8bd74
DM		 3010 rt6_ifdown(net, dev);
3011 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3012
3013 idev = __in6_dev_get(dev);
3014 if (idev == NULL)
3015 return -ENODEV;
3016
bcdd553f
SH		 3017 /*
3018 * Step 1: remove reference to ipv6 device from parent device.
3019 * Do not dev_put!
1da177e4 3020 */
439e2385 3021 if (how) {
1da177e4 3022 idev->dead = 1;
8814c4b5
YH		 3023
3024 /* protected by rtnl_lock */
a9b3cd7f 3025 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3026
3027 /* Step 1.5: remove snmp6 entry */
3028 snmp6_unregister_dev(idev);
3029
3030 }
3031
73a8bd74
DM		 3032 /* Step 2: clear hash table */
3033 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3034 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3035
3036 spin_lock_bh(&addrconf_hash_lock);
3037 restart:
b67bfe0d 3038 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74
DM		 3039 if (ifa->idev == idev) {
3040 hlist_del_init_rcu(&ifa->addr_lst);
3041 addrconf_del_timer(ifa);
3042 goto restart;
3043 }
3044 }
3045 spin_unlock_bh(&addrconf_hash_lock);
3046 }
3047
1da177e4
LT		 3048 write_lock_bh(&idev->lock);
3049
bcdd553f 3050 /* Step 2: clear flags for stateless addrconf */
439e2385 3051 if (!how)
3c21edbd 3052 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3053
1da177e4 3054#ifdef CONFIG_IPV6_PRIVACY
439e2385 3055 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 3056 in6_dev_put(idev);
3057
bcdd553f 3058 /* Step 3: clear tempaddr list */
372e6c8f 3059 while (!list_empty(&idev->tempaddr_list)) {
3060 ifa = list_first_entry(&idev->tempaddr_list,
3061 struct inet6_ifaddr, tmp_list);
3062 list_del(&ifa->tmp_list);
1da177e4
LT		 3063 write_unlock_bh(&idev->lock);
3064 spin_lock_bh(&ifa->lock);
3065
3066 if (ifa->ifpub) {
3067 in6_ifa_put(ifa->ifpub);
3068 ifa->ifpub = NULL;
3069 }
3070 spin_unlock_bh(&ifa->lock);
3071 in6_ifa_put(ifa);
3072 write_lock_bh(&idev->lock);
3073 }
3074#endif
8f37ada5 3075
502a2ffd 3076 while (!list_empty(&idev->addr_list)) {
3077 ifa = list_first_entry(&idev->addr_list,
3078 struct inet6_ifaddr, if_list);
84e8b803 3079 addrconf_del_timer(ifa);
3080
73a8bd74 3081 list_del(&ifa->if_list);
84e8b803 3082
73a8bd74 3083 write_unlock_bh(&idev->lock);
84e8b803 3084
73a8bd74
DM		 3085 spin_lock_bh(&ifa->state_lock);
3086 state = ifa->state;
3087 ifa->state = INET6_IFADDR_STATE_DEAD;
3088 spin_unlock_bh(&ifa->state_lock);
9d82ca98 3089
73a8bd74
DM		 3090 if (state != INET6_IFADDR_STATE_DEAD) {
3091 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3092 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 3093 }
73a8bd74 3094 in6_ifa_put(ifa);
8f37ada5 3095
73a8bd74
DM		 3096 write_lock_bh(&idev->lock);
3097 }
8f37ada5 3098
1da177e4
LT		 3099 write_unlock_bh(&idev->lock);
3100
3101 /* Step 5: Discard multicast list */
439e2385 3102 if (how)
1da177e4
LT		 3103 ipv6_mc_destroy_dev(idev);
3104 else
3105 ipv6_mc_down(idev);
3106
1da177e4 3107 idev->tstamp = jiffies;
1ab1457c 3108
bcdd553f 3109 /* Last: Shot the device (if unregistered) */
439e2385 3110 if (how) {
408c4768 3111 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3112 neigh_parms_release(&nd_tbl, idev->nd_parms);
3113 neigh_ifdown(&nd_tbl, dev);
3114 in6_dev_put(idev);
3115 }
3116 return 0;
3117}
3118
3119static void addrconf_rs_timer(unsigned long data)
3120{
3121 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
5b2a1953 3122 struct inet6_dev *idev = ifp->idev;
1da177e4 3123
5b2a1953 3124 read_lock(&idev->lock);
3125 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3126 goto out;
3127
9ba2add3 3128 if (!ipv6_accept_ra(idev))
5b2a1953 3129 goto out;
3130
3131 /* Announcement received after solicitation was sent */
3132 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3133 goto out;
1da177e4
LT		 3134
3135 spin_lock(&ifp->lock);
5b2a1953 3136 if (ifp->probes++ < idev->cnf.rtr_solicits) {
1da177e4
LT		 3137 /* The wait after the last probe can be shorter */
3138 addrconf_mod_timer(ifp, AC_RS,
5b2a1953 3139 (ifp->probes == idev->cnf.rtr_solicits) ?
3140 idev->cnf.rtr_solicit_delay :
3141 idev->cnf.rtr_solicit_interval);
1da177e4
LT		 3142 spin_unlock(&ifp->lock);
3143
5b2a1953 3144 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 3145 } else {
3146 spin_unlock(&ifp->lock);
3147 /*
3148 * Note: we do not support deprecated "all on-link"
3149 * assumption any longer.
3150 */
91df42be 3151 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3152 }
3153
3154out:
5b2a1953 3155 read_unlock(&idev->lock);
1da177e4
LT		 3156 in6_ifa_put(ifp);
3157}
3158
3159/*
3160 * Duplicate Address Detection
3161 */
3c21edbd
YH		 3162static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3163{
3164 unsigned long rand_num;
3165 struct inet6_dev *idev = ifp->idev;
3166
95c385b4
NH		 3167 if (ifp->flags & IFA_F_OPTIMISTIC)
3168 rand_num = 0;
3169 else
3170 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3171
3c21edbd
YH		 3172 ifp->probes = idev->cnf.dad_transmits;
3173 addrconf_mod_timer(ifp, AC_DAD, rand_num);
3174}
3175
cf22f9a2 3176static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4
LT		 3177{
3178 struct inet6_dev *idev = ifp->idev;
3179 struct net_device *dev = idev->dev;
1da177e4
LT		 3180
3181 addrconf_join_solict(dev, &ifp->addr);
3182
1da177e4 3183 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 3184
3185 read_lock_bh(&idev->lock);
622ccdf1 3186 spin_lock(&ifp->lock);
e9d3e084 3187 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3188 goto out;
1da177e4
LT		 3189
3190 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3191 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3192 !(ifp->flags&IFA_F_TENTATIVE) ||
3193 ifp->flags & IFA_F_NODAD) {
cc411d0b 3194 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3195 spin_unlock(&ifp->lock);
1da177e4
LT		 3196 read_unlock_bh(&idev->lock);
3197
3198 addrconf_dad_completed(ifp);
3199 return;
3200 }
3201
6732bade 3202 if (!(idev->if_flags & IF_READY)) {
21809faf 3203 spin_unlock(&ifp->lock);
6732bade 3204 read_unlock_bh(&idev->lock);
3c21edbd 3205 /*
590a9887 3206 * If the device is not ready:
3c21edbd
YH		 3207 * - keep it tentative if it is a permanent address.
3208 * - otherwise, kill it.
3209 */
3210 in6_ifa_hold(ifp);
cc411d0b 3211 addrconf_dad_stop(ifp, 0);
6732bade 3212 return;
3c21edbd 3213 }
95c385b4
NH		 3214
3215 /*
3216 * Optimistic nodes can start receiving
3217 * Frames right away
3218 */
e21e8467 3219 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 3220 ip6_ins_rt(ifp->rt);
3221
6732bade 3222 addrconf_dad_kick(ifp);
1da177e4 3223out:
622ccdf1 3224 spin_unlock(&ifp->lock);
1da177e4
LT		 3225 read_unlock_bh(&idev->lock);
3226}
3227
3228static void addrconf_dad_timer(unsigned long data)
3229{
3230 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3231 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3232 struct in6_addr mcaddr;
3233
f2344a13
HX		 3234 if (!ifp->probes && addrconf_dad_end(ifp))
3235 goto out;
3236
122e4519 3237 read_lock(&idev->lock);
3238 if (idev->dead || !(idev->if_flags & IF_READY)) {
3239 read_unlock(&idev->lock);
1da177e4
LT		 3240 goto out;
3241 }
21809faf 3242
3243 spin_lock(&ifp->lock);
622ccdf1
HX		 3244 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3245 spin_unlock(&ifp->lock);
3246 read_unlock(&idev->lock);
3247 goto out;
3248 }
3249
1da177e4
LT		 3250 if (ifp->probes == 0) {
3251 /*
3252 * DAD was successful
3253 */
3254
cc411d0b 3255 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3256 spin_unlock(&ifp->lock);
122e4519 3257 read_unlock(&idev->lock);
1da177e4
LT		 3258
3259 addrconf_dad_completed(ifp);
3260
3261 goto out;
3262 }
3263
3264 ifp->probes--;
3265 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
21809faf 3266 spin_unlock(&ifp->lock);
122e4519 3267 read_unlock(&idev->lock);
1da177e4
LT		 3268
3269 /* send a neighbour solicitation for our addr */
1da177e4 3270 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3271 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3272out:
3273 in6_ifa_put(ifp);
3274}
3275
3276static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3277{
e21e8467 3278 struct net_device *dev = ifp->idev->dev;
1da177e4
LT		 3279
3280 /*
3281 * Configure the address for reception. Now it is valid.
3282 */
3283
3284 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3285
026359bc
TA		 3286 /* If added prefix is link local and we are prepared to process
3287 router advertisements, start sending router solicitations.
1da177e4
LT		 3288 */
3289
aeaf6e9d 3290 if (ipv6_accept_ra(ifp->idev) &&
1da177e4
LT		 3291 ifp->idev->cnf.rtr_solicits > 0 &&
3292 (dev->flags&IFF_LOOPBACK) == 0 &&
3293 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 3294 /*
3295 * If a host as already performed a random delay
3296 * [...] as part of DAD [...] there is no need
3297 * to delay again before sending the first RS
3298 */
f3ee4010 3299 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 3300
3301 spin_lock_bh(&ifp->lock);
3302 ifp->probes = 1;
3303 ifp->idev->if_flags |= IF_RS_SENT;
3304 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3305 spin_unlock_bh(&ifp->lock);
3306 }
3307}
3308
e21e8467
SH		 3309static void addrconf_dad_run(struct inet6_dev *idev)
3310{
c5e33bdd
YH		 3311 struct inet6_ifaddr *ifp;
3312
3313 read_lock_bh(&idev->lock);
502a2ffd 3314 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3315 spin_lock(&ifp->lock);
f2344a13
HX		 3316 if (ifp->flags & IFA_F_TENTATIVE &&
3317 ifp->state == INET6_IFADDR_STATE_DAD)
3318 addrconf_dad_kick(ifp);
21809faf 3319 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3320 }
3321 read_unlock_bh(&idev->lock);
3322}
3323
1da177e4
LT		 3324#ifdef CONFIG_PROC_FS
3325struct if6_iter_state {
3c40090a 3326 struct seq_net_private p;
1da177e4 3327 int bucket;
1d578303 3328 int offset;
1da177e4
LT		 3329};
3330
1d578303 3331static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3332{
3333 struct inet6_ifaddr *ifa = NULL;
3334 struct if6_iter_state *state = seq->private;
1218854a 3335 struct net *net = seq_file_net(seq);
1d578303 3336 int p = 0;
1da177e4 3337
1d578303
MM		 3338 /* initial bucket if pos is 0 */
3339 if (pos == 0) {
3340 state->bucket = 0;
3341 state->offset = 0;
3342 }
3343
3344 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3345 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3346 addr_lst) {
9f0d3c27
ED		 3347 if (!net_eq(dev_net(ifa->idev->dev), net))
3348 continue;
1d578303
MM		 3349 /* sync with offset */
3350 if (p < state->offset) {
3351 p++;
3352 continue;
3353 }
3354 state->offset++;
9f0d3c27 3355 return ifa;
1d578303
MM		 3356 }
3357
3358 /* prepare for next bucket */
3359 state->offset = 0;
3360 p = 0;
1da177e4 3361 }
c2e21293 3362 return NULL;
1da177e4
LT		 3363}
3364
c2e21293 3365static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3366 struct inet6_ifaddr *ifa)
1da177e4
LT		 3367{
3368 struct if6_iter_state *state = seq->private;
1218854a 3369 struct net *net = seq_file_net(seq);
1da177e4 3370
b67bfe0d 3371 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3372 if (!net_eq(dev_net(ifa->idev->dev), net))
3373 continue;
1d578303 3374 state->offset++;
9f0d3c27 3375 return ifa;
1d578303 3376 }
3c40090a 3377
c2e21293 3378 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3379 state->offset = 0;
b67bfe0d 3380 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3381 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3382 if (!net_eq(dev_net(ifa->idev->dev), net))
3383 continue;
1d578303 3384 state->offset++;
9f0d3c27 3385 return ifa;
c2e21293 3386 }
1da177e4 3387 }
3c40090a 3388
c2e21293 3389 return NULL;
1da177e4
LT		 3390}
3391
1da177e4 3392static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3393 __acquires(rcu_bh)
1da177e4 3394{
5c578aed 3395 rcu_read_lock_bh();
1d578303 3396 return if6_get_first(seq, *pos);
1da177e4
LT		 3397}
3398
3399static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3400{
3401 struct inet6_ifaddr *ifa;
3402
3403 ifa = if6_get_next(seq, v);
3404 ++*pos;
3405 return ifa;
3406}
3407
3408static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3409 __releases(rcu_bh)
1da177e4 3410{
5c578aed 3411 rcu_read_unlock_bh();
1da177e4
LT		 3412}
3413
3414static int if6_seq_show(struct seq_file *seq, void *v)
3415{
3416 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3417 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3418 &ifp->addr,
1da177e4
LT		 3419 ifp->idev->dev->ifindex,
3420 ifp->prefix_len,
3421 ifp->scope,
3422 ifp->flags,
3423 ifp->idev->dev->name);
3424 return 0;
3425}
3426
56b3d975 3427static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3428 .start = if6_seq_start,
3429 .next = if6_seq_next,
3430 .show = if6_seq_show,
3431 .stop = if6_seq_stop,
3432};
3433
3434static int if6_seq_open(struct inode *inode, struct file *file)
3435{
3c40090a
DL		 3436 return seq_open_net(inode, file, &if6_seq_ops,
3437 sizeof(struct if6_iter_state));
1da177e4
LT		 3438}
3439
9a32144e 3440static const struct file_operations if6_fops = {
1da177e4
LT		 3441 .owner = THIS_MODULE,
3442 .open = if6_seq_open,
3443 .read = seq_read,
3444 .llseek = seq_lseek,
3c40090a 3445 .release = seq_release_net,
1da177e4
LT		 3446};
3447
2c8c1e72 3448static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3449{
d4beaa66 3450 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 3451 return -ENOMEM;
3452 return 0;
3453}
3454
2c8c1e72 3455static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 3456{
ece31ffd 3457 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 3458}
3459
3460static struct pernet_operations if6_proc_net_ops = {
3461 .init = if6_proc_net_init,
3462 .exit = if6_proc_net_exit,
3463};
3464
3465int __init if6_proc_init(void)
3466{
3467 return register_pernet_subsys(&if6_proc_net_ops);
3468}
3469
1da177e4
LT		 3470void if6_proc_exit(void)
3471{
3c40090a 3472 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3473}
3474#endif /* CONFIG_PROC_FS */
3475
07a93626 3476#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3477/* Check if address is a home address configured on any interface. */
b71d1d42 3478int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3479{
3480 int ret = 0;
c2e21293 3481 struct inet6_ifaddr *ifp = NULL;
ddbe5032 3482 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3483
5c578aed 3484 rcu_read_lock_bh();
b67bfe0d 3485 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 3486 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3487 continue;
caad295f 3488 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3489 (ifp->flags & IFA_F_HOMEADDRESS)) {
3490 ret = 1;
3491 break;
3492 }
3493 }
5c578aed 3494 rcu_read_unlock_bh();
3b9f9a1c
NT		 3495 return ret;
3496}
3497#endif
3498
1da177e4
LT		 3499/*
3500 * Periodic address status verification
3501 */
3502
3503static void addrconf_verify(unsigned long foo)
3504{
b2db7564 3505 unsigned long now, next, next_sec, next_sched;
1da177e4 3506 struct inet6_ifaddr *ifp;
1da177e4
LT		 3507 int i;
3508
5c578aed 3509 rcu_read_lock_bh();
3510 spin_lock(&addrconf_verify_lock);
1da177e4 3511 now = jiffies;
b2db7564 3512 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4
LT		 3513
3514 del_timer(&addr_chk_timer);
3515
bcdd553f 3516 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3517restart:
b67bfe0d 3518 hlist_for_each_entry_rcu_bh(ifp,
5c578aed 3519 &inet6_addr_lst[i], addr_lst) {
1da177e4 3520 unsigned long age;
1da177e4
LT		 3521
3522 if (ifp->flags & IFA_F_PERMANENT)
3523 continue;
3524
3525 spin_lock(&ifp->lock);
b2db7564
YH		 3526 /* We try to batch several events at once. */
3527 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3528
8f27ebb9
YH		 3529 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3530 age >= ifp->valid_lft) {
1da177e4
LT		 3531 spin_unlock(&ifp->lock);
3532 in6_ifa_hold(ifp);
1da177e4
LT		 3533 ipv6_del_addr(ifp);
3534 goto restart;
8f27ebb9
YH		 3535 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3536 spin_unlock(&ifp->lock);
3537 continue;
1da177e4 3538 } else if (age >= ifp->prefered_lft) {
a1ed0526 3539 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3540 int deprecate = 0;
3541
3542 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3543 deprecate = 1;
3544 ifp->flags |= IFA_F_DEPRECATED;
3545 }
3546
3547 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3548 next = ifp->tstamp + ifp->valid_lft * HZ;
3549
3550 spin_unlock(&ifp->lock);
3551
3552 if (deprecate) {
3553 in6_ifa_hold(ifp);
1da177e4
LT		 3554
3555 ipv6_ifa_notify(0, ifp);
3556 in6_ifa_put(ifp);
3557 goto restart;
3558 }
3559#ifdef CONFIG_IPV6_PRIVACY
3560 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3561 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3562 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3563 ifp->idev->cnf.dad_transmits *
3564 ifp->idev->nd_parms->retrans_time / HZ;
3565
1da177e4
LT		 3566 if (age >= ifp->prefered_lft - regen_advance) {
3567 struct inet6_ifaddr *ifpub = ifp->ifpub;
3568 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3569 next = ifp->tstamp + ifp->prefered_lft * HZ;
3570 if (!ifp->regen_count && ifpub) {
3571 ifp->regen_count++;
3572 in6_ifa_hold(ifp);
3573 in6_ifa_hold(ifpub);
3574 spin_unlock(&ifp->lock);
5c578aed 3575
291d809b
HY		 3576 spin_lock(&ifpub->lock);
3577 ifpub->regen_count = 0;
3578 spin_unlock(&ifpub->lock);
1da177e4
LT		 3579 ipv6_create_tempaddr(ifpub, ifp);
3580 in6_ifa_put(ifpub);
3581 in6_ifa_put(ifp);
3582 goto restart;
3583 }
3584 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3585 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3586 spin_unlock(&ifp->lock);
3587#endif
3588 } else {
3589 /* ifp->prefered_lft <= ifp->valid_lft */
3590 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3591 next = ifp->tstamp + ifp->prefered_lft * HZ;
3592 spin_unlock(&ifp->lock);
3593 }
3594 }
1da177e4
LT		 3595 }
3596
b2db7564
YH		 3597 next_sec = round_jiffies_up(next);
3598 next_sched = next;
3599
3600 /* If rounded timeout is accurate enough, accept it. */
3601 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3602 next_sched = next_sec;
3603
3604 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3605 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3606 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3607
3608 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3609 now, next, next_sec, next_sched));
3610
3611 addr_chk_timer.expires = next_sched;
1da177e4 3612 add_timer(&addr_chk_timer);
5c578aed 3613 spin_unlock(&addrconf_verify_lock);
3614 rcu_read_unlock_bh();
1da177e4
LT		 3615}
3616
caeaba79
ND		 3617static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3618 struct in6_addr **peer_pfx)
461d8837
TG		 3619{
3620 struct in6_addr *pfx = NULL;
3621
caeaba79
ND		 3622 *peer_pfx = NULL;
3623
461d8837
TG		 3624 if (addr)
3625 pfx = nla_data(addr);
3626
3627 if (local) {
3628 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 3629 *peer_pfx = pfx;
3630 pfx = nla_data(local);
461d8837
TG		 3631 }
3632
3633 return pfx;
3634}
3635
ef7c79ed 3636static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3637 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3638 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3639 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3640};
3641
1da177e4 3642static int
661d2967 3643inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3644{
3b1e0a65 3645 struct net *net = sock_net(skb->sk);
b933f716
TG		 3646 struct ifaddrmsg *ifm;
3647 struct nlattr *tb[IFA_MAX+1];
caeaba79 3648 struct in6_addr *pfx, *peer_pfx;
b933f716 3649 int err;
1da177e4 3650
b933f716
TG		 3651 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3652 if (err < 0)
3653 return err;
3654
3655 ifm = nlmsg_data(nlh);
caeaba79 3656 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3657 if (pfx == NULL)
3658 return -EINVAL;
3659
af284937 3660 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3661}
3662
55ebaef1
NT		 3663static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3664 u32 prefered_lft, u32 valid_lft)
081bba5b 3665{
6f704992
YH		 3666 u32 flags;
3667 clock_t expires;
4bed72e4 3668 unsigned long timeout;
46d48046 3669
081bba5b
NT		 3670 if (!valid_lft || (prefered_lft > valid_lft))
3671 return -EINVAL;
3672
4bed72e4
YH		 3673 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3674 if (addrconf_finite_timeout(timeout)) {
3675 expires = jiffies_to_clock_t(timeout * HZ);
3676 valid_lft = timeout;
6f704992 3677 flags = RTF_EXPIRES;
4bed72e4
YH		 3678 } else {
3679 expires = 0;
3680 flags = 0;
3681 ifa_flags |= IFA_F_PERMANENT;
6f704992 3682 }
081bba5b 3683
4bed72e4
YH		 3684 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3685 if (addrconf_finite_timeout(timeout)) {
3686 if (timeout == 0)
3687 ifa_flags |= IFA_F_DEPRECATED;
3688 prefered_lft = timeout;
3689 }
081bba5b
NT		 3690
3691 spin_lock_bh(&ifp->lock);
3b9f9a1c 3692 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3693 ifp->tstamp = jiffies;
3694 ifp->valid_lft = valid_lft;
3695 ifp->prefered_lft = prefered_lft;
3696
3697 spin_unlock_bh(&ifp->lock);
3698 if (!(ifp->flags&IFA_F_TENTATIVE))
3699 ipv6_ifa_notify(0, ifp);
081bba5b 3700
46d48046 3701 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3702 expires, flags);
081bba5b
NT		 3703 addrconf_verify(0);
3704
3705 return 0;
3706}
3707
1da177e4 3708static int
661d2967 3709inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3710{
3b1e0a65 3711 struct net *net = sock_net(skb->sk);
461d8837
TG		 3712 struct ifaddrmsg *ifm;
3713 struct nlattr *tb[IFA_MAX+1];
caeaba79 3714 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 3715 struct inet6_ifaddr *ifa;
3716 struct net_device *dev;
55ebaef1
NT		 3717 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3718 u8 ifa_flags;
461d8837 3719 int err;
1da177e4 3720
461d8837
TG		 3721 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3722 if (err < 0)
3723 return err;
3724
3725 ifm = nlmsg_data(nlh);
caeaba79 3726 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3727 if (pfx == NULL)
3728 return -EINVAL;
3729
461d8837 3730 if (tb[IFA_CACHEINFO]) {
0778769d 3731 struct ifa_cacheinfo *ci;
461d8837
TG		 3732
3733 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3734 valid_lft = ci->ifa_valid;
461d8837
TG		 3735 preferred_lft = ci->ifa_prefered;
3736 } else {
3737 preferred_lft = INFINITY_LIFE_TIME;
3738 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3739 }
3740
af284937 3741 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3742 if (dev == NULL)
3743 return -ENODEV;
3744
55ebaef1 3745 /* We ignore other flags so far. */
3b9f9a1c 3746 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3747
1cab3da6 3748 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3749 if (ifa == NULL) {
3750 /*
3751 * It would be best to check for !NLM_F_CREATE here but
3752 * userspace alreay relies on not having to provide this.
3753 */
caeaba79 3754 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 3755 ifm->ifa_prefixlen, ifa_flags,
3756 preferred_lft, valid_lft);
081bba5b
NT		 3757 }
3758
7198f8ce
TG		 3759 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3760 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3761 err = -EEXIST;
3762 else
55ebaef1 3763 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3764
3765 in6_ifa_put(ifa);
3766
3767 return err;
1da177e4
LT		 3768}
3769
101bb229
TG		 3770static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3771 u8 scope, int ifindex)
3772{
3773 struct ifaddrmsg *ifm;
3774
3775 ifm = nlmsg_data(nlh);
3776 ifm->ifa_family = AF_INET6;
3777 ifm->ifa_prefixlen = prefixlen;
3778 ifm->ifa_flags = flags;
3779 ifm->ifa_scope = scope;
3780 ifm->ifa_index = ifindex;
3781}
3782
85486af0
TG		 3783static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3784 unsigned long tstamp, u32 preferred, u32 valid)
3785{
3786 struct ifa_cacheinfo ci;
3787
18a31e1e
TG		 3788 ci.cstamp = cstamp_delta(cstamp);
3789 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 3790 ci.ifa_prefered = preferred;
3791 ci.ifa_valid = valid;
3792
3793 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3794}
3795
101bb229
TG		 3796static inline int rt_scope(int ifa_scope)
3797{
3798 if (ifa_scope & IFA_HOST)
3799 return RT_SCOPE_HOST;
3800 else if (ifa_scope & IFA_LINK)
3801 return RT_SCOPE_LINK;
3802 else if (ifa_scope & IFA_SITE)
3803 return RT_SCOPE_SITE;
3804 else
3805 return RT_SCOPE_UNIVERSE;
3806}
3807
0ab6803b
TG		 3808static inline int inet6_ifaddr_msgsize(void)
3809{
339bf98f 3810 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 3811 + nla_total_size(16) /* IFA_LOCAL */
339bf98f
TG		 3812 + nla_total_size(16) /* IFA_ADDRESS */
3813 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3814}
c5396a31 3815
1da177e4 3816static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 3817 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3818{
1da177e4 3819 struct nlmsghdr *nlh;
85486af0 3820 u32 preferred, valid;
1da177e4 3821
15e47304 3822 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3823 if (nlh == NULL)
26932566 3824 return -EMSGSIZE;
0ab6803b 3825
101bb229
TG		 3826 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3827 ifa->idev->dev->ifindex);
3828
1da177e4 3829 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3830 preferred = ifa->prefered_lft;
3831 valid = ifa->valid_lft;
3832 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3833 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3834 if (preferred > tval)
3835 preferred -= tval;
3836 else
3837 preferred = 0;
f56619fc
BH		 3838 if (valid != INFINITY_LIFE_TIME) {
3839 if (valid > tval)
3840 valid -= tval;
3841 else
3842 valid = 0;
3843 }
1da177e4
LT		 3844 }
3845 } else {
85486af0
TG		 3846 preferred = INFINITY_LIFE_TIME;
3847 valid = INFINITY_LIFE_TIME;
3848 }
3849
7996c799 3850 if (!ipv6_addr_any(&ifa->peer_addr)) {
caeaba79
ND		 3851 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3852 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3853 goto error;
3854 } else
3855 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3856 goto error;
3857
3858 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3859 goto error;
1da177e4 3860
0ab6803b 3861 return nlmsg_end(skb, nlh);
caeaba79
ND		 3862
3863error:
3864 nlmsg_cancel(skb, nlh);
3865 return -EMSGSIZE;
1da177e4
LT		 3866}
3867
3868static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 3869 u32 portid, u32 seq, int event, u16 flags)
1da177e4 3870{
1da177e4 3871 struct nlmsghdr *nlh;
101bb229
TG		 3872 u8 scope = RT_SCOPE_UNIVERSE;
3873 int ifindex = ifmca->idev->dev->ifindex;
3874
3875 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3876 scope = RT_SCOPE_SITE;
1da177e4 3877
15e47304 3878 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3879 if (nlh == NULL)
26932566 3880 return -EMSGSIZE;
85486af0 3881
0ab6803b
TG		 3882 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3883 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3884 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3885 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3886 nlmsg_cancel(skb, nlh);
3887 return -EMSGSIZE;
3888 }
85486af0 3889
0ab6803b 3890 return nlmsg_end(skb, nlh);
1da177e4
LT		 3891}
3892
3893static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 3894 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3895{
1da177e4 3896 struct nlmsghdr *nlh;
101bb229
TG		 3897 u8 scope = RT_SCOPE_UNIVERSE;
3898 int ifindex = ifaca->aca_idev->dev->ifindex;
3899
3900 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3901 scope = RT_SCOPE_SITE;
1da177e4 3902
15e47304 3903 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3904 if (nlh == NULL)
26932566 3905 return -EMSGSIZE;
85486af0 3906
0ab6803b
TG		 3907 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3908 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3909 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3910 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3911 nlmsg_cancel(skb, nlh);
3912 return -EMSGSIZE;
3913 }
1da177e4 3914
0ab6803b 3915 return nlmsg_end(skb, nlh);
1da177e4
LT		 3916}
3917
e21e8467 3918enum addr_type_t {
1da177e4
LT		 3919 UNICAST_ADDR,
3920 MULTICAST_ADDR,
3921 ANYCAST_ADDR,
3922};
3923
234b27c3
ED		 3924/* called with rcu_read_lock() */
3925static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3926 struct netlink_callback *cb, enum addr_type_t type,
3927 int s_ip_idx, int *p_ip_idx)
3928{
234b27c3
ED		 3929 struct ifmcaddr6 *ifmca;
3930 struct ifacaddr6 *ifaca;
3931 int err = 1;
3932 int ip_idx = *p_ip_idx;
3933
3934 read_lock_bh(&idev->lock);
3935 switch (type) {
502a2ffd 3936 case UNICAST_ADDR: {
3937 struct inet6_ifaddr *ifa;
3938
234b27c3 3939 /* unicast address incl. temp addr */
502a2ffd 3940 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3941 if (++ip_idx < s_ip_idx)
234b27c3
ED		 3942 continue;
3943 err = inet6_fill_ifaddr(skb, ifa,
15e47304 3944 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3945 cb->nlh->nlmsg_seq,
3946 RTM_NEWADDR,
3947 NLM_F_MULTI);
3948 if (err <= 0)
3949 break;
63998ac2 3950 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 3951 }
3952 break;
502a2ffd 3953 }
234b27c3
ED		 3954 case MULTICAST_ADDR:
3955 /* multicast address */
3956 for (ifmca = idev->mc_list; ifmca;
3957 ifmca = ifmca->next, ip_idx++) {
3958 if (ip_idx < s_ip_idx)
3959 continue;
3960 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 3961 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3962 cb->nlh->nlmsg_seq,
3963 RTM_GETMULTICAST,
3964 NLM_F_MULTI);
3965 if (err <= 0)
3966 break;
3967 }
3968 break;
3969 case ANYCAST_ADDR:
3970 /* anycast address */
3971 for (ifaca = idev->ac_list; ifaca;
3972 ifaca = ifaca->aca_next, ip_idx++) {
3973 if (ip_idx < s_ip_idx)
3974 continue;
3975 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 3976 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3977 cb->nlh->nlmsg_seq,
3978 RTM_GETANYCAST,
3979 NLM_F_MULTI);
3980 if (err <= 0)
3981 break;
3982 }
3983 break;
3984 default:
3985 break;
3986 }
3987 read_unlock_bh(&idev->lock);
3988 *p_ip_idx = ip_idx;
3989 return err;
3990}
3991
1da177e4
LT		 3992static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3993 enum addr_type_t type)
3994{
234b27c3
ED		 3995 struct net *net = sock_net(skb->sk);
3996 int h, s_h;
1da177e4
LT		 3997 int idx, ip_idx;
3998 int s_idx, s_ip_idx;
1da177e4 3999 struct net_device *dev;
234b27c3
ED		 4000 struct inet6_dev *idev;
4001 struct hlist_head *head;
1ab1457c 4002
234b27c3
ED		 4003 s_h = cb->args[0];
4004 s_idx = idx = cb->args[1];
4005 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4006
234b27c3 4007 rcu_read_lock();
63998ac2 4008 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4009 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4010 idx = 0;
4011 head = &net->dev_index_head[h];
b67bfe0d 4012 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4013 if (idx < s_idx)
4014 goto cont;
4b97efdf 4015 if (h > s_h || idx > s_idx)
234b27c3
ED		 4016 s_ip_idx = 0;
4017 ip_idx = 0;
e21e8467
SH		 4018 idev = __in6_dev_get(dev);
4019 if (!idev)
234b27c3
ED		 4020 goto cont;
4021
4022 if (in6_dump_addrs(idev, skb, cb, type,
4023 s_ip_idx, &ip_idx) <= 0)
4024 goto done;
7562f876 4025cont:
234b27c3
ED		 4026 idx++;
4027 }
1da177e4 4028 }
234b27c3
ED		 4029done:
4030 rcu_read_unlock();
4031 cb->args[0] = h;
4032 cb->args[1] = idx;
4033 cb->args[2] = ip_idx;
4034
1da177e4
LT		 4035 return skb->len;
4036}
4037
4038static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4039{
4040 enum addr_type_t type = UNICAST_ADDR;
b854272b 4041
1da177e4
LT		 4042 return inet6_dump_addr(skb, cb, type);
4043}
4044
4045static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4046{
4047 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4048
1da177e4
LT		 4049 return inet6_dump_addr(skb, cb, type);
4050}
4051
4052
4053static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4054{
4055 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4056
1da177e4
LT		 4057 return inet6_dump_addr(skb, cb, type);
4058}
4059
661d2967 4060static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4061{
3b1e0a65 4062 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4063 struct ifaddrmsg *ifm;
4064 struct nlattr *tb[IFA_MAX+1];
caeaba79 4065 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4066 struct net_device *dev = NULL;
4067 struct inet6_ifaddr *ifa;
4068 struct sk_buff *skb;
6c223828
NT		 4069 int err;
4070
1b29fc2c
TG		 4071 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4072 if (err < 0)
4073 goto errout;
4074
caeaba79 4075 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
1b29fc2c
TG		 4076 if (addr == NULL) {
4077 err = -EINVAL;
4078 goto errout;
6c223828 4079 }
6c223828 4080
1b29fc2c 4081 ifm = nlmsg_data(nlh);
6c223828 4082 if (ifm->ifa_index)
6fda7350 4083 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4084
e21e8467
SH		 4085 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4086 if (!ifa) {
1b29fc2c
TG		 4087 err = -EADDRNOTAVAIL;
4088 goto errout;
4089 }
6c223828 4090
e21e8467
SH		 4091 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4092 if (!skb) {
6c223828 4093 err = -ENOBUFS;
1b29fc2c 4094 goto errout_ifa;
6c223828
NT		 4095 }
4096
15e47304 4097 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4098 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4099 if (err < 0) {
4100 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4101 WARN_ON(err == -EMSGSIZE);
4102 kfree_skb(skb);
4103 goto errout_ifa;
4104 }
15e47304 4105 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4106errout_ifa:
6c223828 4107 in6_ifa_put(ifa);
1b29fc2c 4108errout:
6c223828 4109 return err;
6c223828
NT		 4110}
4111
1da177e4
LT		 4112static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4113{
4114 struct sk_buff *skb;
c346dca1 4115 struct net *net = dev_net(ifa->idev->dev);
5d620266 4116 int err = -ENOBUFS;
1da177e4 4117
0ab6803b 4118 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 4119 if (skb == NULL)
4120 goto errout;
4121
4122 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4123 if (err < 0) {
4124 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4125 WARN_ON(err == -EMSGSIZE);
4126 kfree_skb(skb);
4127 goto errout;
4128 }
1ce85fe4
PNA		 4129 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4130 return;
5d620266
TG		 4131errout:
4132 if (err < 0)
6fda7350 4133 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4134}
4135
b6f99a21 4136static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4137 __s32 *array, int bytes)
4138{
04561c1f
TG		 4139 BUG_ON(bytes < (DEVCONF_MAX * 4));
4140
1da177e4
LT		 4141 memset(array, 0, bytes);
4142 array[DEVCONF_FORWARDING] = cnf->forwarding;
4143 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4144 array[DEVCONF_MTU6] = cnf->mtu6;
4145 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4146 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4147 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4148 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4149 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4150 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4151 jiffies_to_msecs(cnf->rtr_solicit_interval);
4152 array[DEVCONF_RTR_SOLICIT_DELAY] =
4153 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4
LT		 4154 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4155#ifdef CONFIG_IPV6_PRIVACY
4156 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4157 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4158 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4159 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4160 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4161#endif
4162 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4163 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 4164 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4165#ifdef CONFIG_IPV6_ROUTER_PREF
4166 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4167 array[DEVCONF_RTR_PROBE_INTERVAL] =
4168 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4169#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4170 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4171#endif
930d6ff2 4172#endif
fbea49e1 4173 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4174 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4175#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4176 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4177#endif
7bc570c8
YH		 4178#ifdef CONFIG_IPV6_MROUTE
4179 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4180#endif
778d80be 4181 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4182 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4183 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4184 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
1da177e4
LT		 4185}
4186
b382b191
TG		 4187static inline size_t inet6_ifla6_size(void)
4188{
4189 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4190 + nla_total_size(sizeof(struct ifla_cacheinfo))
4191 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4192 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4193 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4194 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4195}
4196
339bf98f
TG		 4197static inline size_t inet6_if_nlmsg_size(void)
4198{
4199 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4200 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4201 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4202 + nla_total_size(4) /* IFLA_MTU */
4203 + nla_total_size(4) /* IFLA_LINK */
b382b191 4204 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4205}
c5396a31 4206
be281e55 4207static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4208 int items, int bytes)
7f7d9a6b
HX		 4209{
4210 int i;
4211 int pad = bytes - sizeof(u64) * items;
4212 BUG_ON(pad < 0);
4213
4214 /* Use put_unaligned() because stats may not be aligned for u64. */
4215 put_unaligned(items, &stats[0]);
4216 for (i = 1; i < items; i++)
be281e55 4217 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4218
4219 memset(&stats[items], 0, pad);
4220}
4221
4ce3c183
ED		 4222static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4223 int items, int bytes, size_t syncpoff)
4224{
4225 int i;
4226 int pad = bytes - sizeof(u64) * items;
4227 BUG_ON(pad < 0);
4228
4229 /* Use put_unaligned() because stats may not be aligned for u64. */
4230 put_unaligned(items, &stats[0]);
4231 for (i = 1; i < items; i++)
4232 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4233
4234 memset(&stats[items], 0, pad);
4235}
4236
7f7d9a6b
HX		 4237static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4238 int bytes)
4239{
e21e8467 4240 switch (attrtype) {
7f7d9a6b 4241 case IFLA_INET6_STATS:
4ce3c183
ED		 4242 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4243 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4244 break;
4245 case IFLA_INET6_ICMP6STATS:
be281e55 4246 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4247 break;
4248 }
4249}
4250
b382b191
TG		 4251static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4252{
4253 struct nlattr *nla;
4254 struct ifla_cacheinfo ci;
4255
c78679e8
DM		 4256 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4257 goto nla_put_failure;
b382b191 4258 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4259 ci.tstamp = cstamp_delta(idev->tstamp);
4260 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4261 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
c78679e8
DM		 4262 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4263 goto nla_put_failure;
b382b191
TG		 4264 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4265 if (nla == NULL)
4266 goto nla_put_failure;
4267 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4268
4269 /* XXX - MC not implemented */
4270
4271 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4272 if (nla == NULL)
4273 goto nla_put_failure;
4274 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4275
4276 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4277 if (nla == NULL)
4278 goto nla_put_failure;
4279 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4280
f53adae4
DB		 4281 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4282 if (nla == NULL)
4283 goto nla_put_failure;
4284 read_lock_bh(&idev->lock);
4285 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4286 read_unlock_bh(&idev->lock);
4287
b382b191
TG		 4288 return 0;
4289
4290nla_put_failure:
4291 return -EMSGSIZE;
4292}
4293
4294static size_t inet6_get_link_af_size(const struct net_device *dev)
4295{
4296 if (!__in6_dev_get(dev))
4297 return 0;
4298
4299 return inet6_ifla6_size();
4300}
4301
4302static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4303{
4304 struct inet6_dev *idev = __in6_dev_get(dev);
4305
4306 if (!idev)
4307 return -ENODATA;
4308
4309 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4310 return -EMSGSIZE;
4311
4312 return 0;
4313}
4314
f53adae4
DB		 4315static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4316{
f53adae4
DB		 4317 struct inet6_ifaddr *ifp;
4318 struct net_device *dev = idev->dev;
fc403832 4319 bool update_rs = false;
f53adae4
DB		 4320
4321 if (token == NULL)
4322 return -EINVAL;
4323 if (ipv6_addr_any(token))
4324 return -EINVAL;
4325 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4326 return -EINVAL;
f53adae4
DB		 4327 if (!ipv6_accept_ra(idev))
4328 return -EINVAL;
4329 if (idev->cnf.rtr_solicits <= 0)
4330 return -EINVAL;
4331
4332 write_lock_bh(&idev->lock);
4333
4334 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4335 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4336
4337 write_unlock_bh(&idev->lock);
4338
fc403832
DB		 4339 if (!idev->dead && (idev->if_flags & IF_READY)) {
4340 struct in6_addr ll_addr;
4341
4342 ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4343 IFA_F_OPTIMISTIC);
4344
4345 /* If we're not ready, then normal ifup will take care
4346 * of this. Otherwise, we need to request our rs here.
4347 */
4348 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4349 update_rs = true;
4350 }
f53adae4
DB		 4351
4352 write_lock_bh(&idev->lock);
fc403832
DB		 4353
4354 if (update_rs)
4355 idev->if_flags |= IF_RS_SENT;
f53adae4
DB		 4356
4357 /* Well, that's kinda nasty ... */
4358 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4359 spin_lock(&ifp->lock);
617fe29d 4360 if (ifp->tokenized) {
f53adae4
DB		 4361 ifp->valid_lft = 0;
4362 ifp->prefered_lft = 0;
4363 }
4364 spin_unlock(&ifp->lock);
4365 }
4366
4367 write_unlock_bh(&idev->lock);
4368 return 0;
4369}
4370
4371static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4372{
4373 int err = -EINVAL;
4374 struct inet6_dev *idev = __in6_dev_get(dev);
4375 struct nlattr *tb[IFLA_INET6_MAX + 1];
4376
4377 if (!idev)
4378 return -EAFNOSUPPORT;
4379
4380 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4381 BUG();
4382
4383 if (tb[IFLA_INET6_TOKEN])
4384 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4385
4386 return err;
4387}
4388
1ab1457c 4389static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4390 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4391{
04561c1f 4392 struct net_device *dev = idev->dev;
04561c1f
TG		 4393 struct ifinfomsg *hdr;
4394 struct nlmsghdr *nlh;
4395 void *protoinfo;
04561c1f 4396
15e47304 4397 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
04561c1f 4398 if (nlh == NULL)
26932566 4399 return -EMSGSIZE;
04561c1f
TG		 4400
4401 hdr = nlmsg_data(nlh);
4402 hdr->ifi_family = AF_INET6;
4403 hdr->__ifi_pad = 0;
4404 hdr->ifi_type = dev->type;
4405 hdr->ifi_index = dev->ifindex;
4406 hdr->ifi_flags = dev_get_flags(dev);
4407 hdr->ifi_change = 0;
4408
c78679e8
DM		 4409 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4410 (dev->addr_len &&
4411 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4412 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4413 (dev->ifindex != dev->iflink &&
4414 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4415 goto nla_put_failure;
04561c1f
TG		 4416 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4417 if (protoinfo == NULL)
4418 goto nla_put_failure;
1da177e4 4419
b382b191 4420 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4421 goto nla_put_failure;
1da177e4 4422
04561c1f
TG		 4423 nla_nest_end(skb, protoinfo);
4424 return nlmsg_end(skb, nlh);
1da177e4 4425
04561c1f 4426nla_put_failure:
26932566
PM		 4427 nlmsg_cancel(skb, nlh);
4428 return -EMSGSIZE;
1da177e4
LT		 4429}
4430
4431static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4432{
3b1e0a65 4433 struct net *net = sock_net(skb->sk);
84d2697d 4434 int h, s_h;
434a8a58 4435 int idx = 0, s_idx;
1da177e4
LT		 4436 struct net_device *dev;
4437 struct inet6_dev *idev;
84d2697d 4438 struct hlist_head *head;
1da177e4 4439
84d2697d
ED		 4440 s_h = cb->args[0];
4441 s_idx = cb->args[1];
4442
4443 rcu_read_lock();
4444 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4445 idx = 0;
4446 head = &net->dev_index_head[h];
b67bfe0d 4447 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 4448 if (idx < s_idx)
4449 goto cont;
4450 idev = __in6_dev_get(dev);
4451 if (!idev)
4452 goto cont;
4453 if (inet6_fill_ifinfo(skb, idev,
15e47304 4454 NETLINK_CB(cb->skb).portid,
84d2697d
ED		 4455 cb->nlh->nlmsg_seq,
4456 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4457 goto out;
7562f876 4458cont:
84d2697d
ED		 4459 idx++;
4460 }
1da177e4 4461 }
84d2697d
ED		 4462out:
4463 rcu_read_unlock();
4464 cb->args[1] = idx;
4465 cb->args[0] = h;
1da177e4
LT		 4466
4467 return skb->len;
4468}
4469
4470void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4471{
4472 struct sk_buff *skb;
c346dca1 4473 struct net *net = dev_net(idev->dev);
8d7a76c9 4474 int err = -ENOBUFS;
1ab1457c 4475
339bf98f 4476 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4477 if (skb == NULL)
4478 goto errout;
4479
4480 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4481 if (err < 0) {
4482 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4483 WARN_ON(err == -EMSGSIZE);
4484 kfree_skb(skb);
4485 goto errout;
4486 }
5f75a104 4487 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4488 return;
8d7a76c9
TG		 4489errout:
4490 if (err < 0)
5f75a104 4491 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4492}
4493
339bf98f
TG		 4494static inline size_t inet6_prefix_nlmsg_size(void)
4495{
4496 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4497 + nla_total_size(sizeof(struct in6_addr))
4498 + nla_total_size(sizeof(struct prefix_cacheinfo));
4499}
c5396a31 4500
1da177e4 4501static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4502 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 4503 int event, unsigned int flags)
1da177e4 4504{
6051e2f4
TG		 4505 struct prefixmsg *pmsg;
4506 struct nlmsghdr *nlh;
1da177e4
LT		 4507 struct prefix_cacheinfo ci;
4508
15e47304 4509 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6051e2f4 4510 if (nlh == NULL)
26932566 4511 return -EMSGSIZE;
6051e2f4
TG		 4512
4513 pmsg = nlmsg_data(nlh);
1da177e4 4514 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4515 pmsg->prefix_pad1 = 0;
4516 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4517 pmsg->prefix_ifindex = idev->dev->ifindex;
4518 pmsg->prefix_len = pinfo->prefix_len;
4519 pmsg->prefix_type = pinfo->type;
8a47077a 4520 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4521 pmsg->prefix_flags = 0;
4522 if (pinfo->onlink)
4523 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4524 if (pinfo->autoconf)
4525 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4526
c78679e8
DM		 4527 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4528 goto nla_put_failure;
1da177e4
LT		 4529 ci.preferred_time = ntohl(pinfo->prefered);
4530 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 4531 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4532 goto nla_put_failure;
6051e2f4 4533 return nlmsg_end(skb, nlh);
1da177e4 4534
6051e2f4 4535nla_put_failure:
26932566
PM		 4536 nlmsg_cancel(skb, nlh);
4537 return -EMSGSIZE;
1da177e4
LT		 4538}
4539
1ab1457c 4540static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4541 struct prefix_info *pinfo)
4542{
4543 struct sk_buff *skb;
c346dca1 4544 struct net *net = dev_net(idev->dev);
8c384bfa 4545 int err = -ENOBUFS;
1da177e4 4546
339bf98f 4547 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4548 if (skb == NULL)
4549 goto errout;
4550
4551 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4552 if (err < 0) {
4553 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4554 WARN_ON(err == -EMSGSIZE);
4555 kfree_skb(skb);
4556 goto errout;
4557 }
1ce85fe4
PNA		 4558 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4559 return;
8c384bfa
TG		 4560errout:
4561 if (err < 0)
6fda7350 4562 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4563}
4564
1da177e4
LT		 4565static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4566{
63998ac2
ND		 4567 struct net *net = dev_net(ifp->idev->dev);
4568
1da177e4
LT		 4569 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4570
4571 switch (event) {
4572 case RTM_NEWADDR:
95c385b4
NH		 4573 /*
4574 * If the address was optimistic
4575 * we inserted the route at the start of
4576 * our DAD process, so we don't need
4577 * to do it again
4578 */
4579 if (!(ifp->rt->rt6i_node))
4580 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4581 if (ifp->idev->cnf.forwarding)
4582 addrconf_join_anycast(ifp);
7996c799 4583 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 4584 addrconf_prefix_route(&ifp->peer_addr, 128,
4585 ifp->idev->dev, 0, 0);
1da177e4
LT		 4586 break;
4587 case RTM_DELADDR:
4588 if (ifp->idev->cnf.forwarding)
4589 addrconf_leave_anycast(ifp);
4590 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 4591 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79
ND		 4592 struct rt6_info *rt;
4593 struct net_device *dev = ifp->idev->dev;
4594
4595 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4596 dev->ifindex, 1);
4597 if (rt) {
4598 dst_hold(&rt->dst);
4599 if (ip6_del_rt(rt))
4600 dst_free(&rt->dst);
4601 }
4602 }
d8d1f30b 4603 dst_hold(&ifp->rt->dst);
93fa159a 4604
73a8bd74 4605 if (ip6_del_rt(ifp->rt))
d8d1f30b 4606 dst_free(&ifp->rt->dst);
1da177e4
LT		 4607 break;
4608 }
63998ac2 4609 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 4610}
4611
4612static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4613{
8814c4b5 4614 rcu_read_lock_bh();
1da177e4
LT		 4615 if (likely(ifp->idev->dead == 0))
4616 __ipv6_ifa_notify(event, ifp);
8814c4b5 4617 rcu_read_unlock_bh();
1da177e4
LT		 4618}
4619
4620#ifdef CONFIG_SYSCTL
4621
4622static
8d65af78 4623int addrconf_sysctl_forward(ctl_table *ctl, int write,
1da177e4
LT		 4624 void __user *buffer, size_t *lenp, loff_t *ppos)
4625{
4626 int *valp = ctl->data;
4627 int val = *valp;
88af182e 4628 loff_t pos = *ppos;
013d97e9 4629 ctl_table lctl;
1da177e4
LT		 4630 int ret;
4631
013d97e9
FR		 4632 /*
4633 * ctl->data points to idev->cnf.forwarding, we should
4634 * not modify it until we get the rtnl lock.
4635 */
4636 lctl = *ctl;
4637 lctl.data = &val;
4638
4639 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 4640
c8fecf22 4641 if (write)
b325fddb 4642 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4643 if (ret)
4644 *ppos = pos;
1ab1457c 4645 return ret;
1da177e4
LT		 4646}
4647
56d417b1
BH		 4648static void dev_disable_change(struct inet6_dev *idev)
4649{
75538c2b
CW		 4650 struct netdev_notifier_info info;
4651
56d417b1
BH		 4652 if (!idev || !idev->dev)
4653 return;
4654
75538c2b 4655 netdev_notifier_info_init(&info, idev->dev);
56d417b1 4656 if (idev->cnf.disable_ipv6)
75538c2b 4657 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 4658 else
75538c2b 4659 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 4660}
4661
4662static void addrconf_disable_change(struct net *net, __s32 newf)
4663{
4664 struct net_device *dev;
4665 struct inet6_dev *idev;
4666
c6d14c84
ED		 4667 rcu_read_lock();
4668 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4669 idev = __in6_dev_get(dev);
4670 if (idev) {
4671 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4672 idev->cnf.disable_ipv6 = newf;
4673 if (changed)
4674 dev_disable_change(idev);
4675 }
56d417b1 4676 }
c6d14c84 4677 rcu_read_unlock();
56d417b1
BH		 4678}
4679
013d97e9 4680static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 4681{
4682 struct net *net;
013d97e9
FR		 4683 int old;
4684
4685 if (!rtnl_trylock())
4686 return restart_syscall();
56d417b1
BH		 4687
4688 net = (struct net *)table->extra2;
013d97e9
FR		 4689 old = *p;
4690 *p = newf;
56d417b1 4691
013d97e9
FR		 4692 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4693 rtnl_unlock();
56d417b1 4694 return 0;
88af182e 4695 }
56d417b1
BH		 4696
4697 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 4698 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4699 addrconf_disable_change(net, newf);
013d97e9 4700 } else if ((!newf) ^ (!old))
56d417b1
BH		 4701 dev_disable_change((struct inet6_dev *)table->extra1);
4702
4703 rtnl_unlock();
4704 return 0;
4705}
4706
4707static
8d65af78 4708int addrconf_sysctl_disable(ctl_table *ctl, int write,
56d417b1
BH		 4709 void __user *buffer, size_t *lenp, loff_t *ppos)
4710{
4711 int *valp = ctl->data;
4712 int val = *valp;
88af182e 4713 loff_t pos = *ppos;
013d97e9 4714 ctl_table lctl;
56d417b1
BH		 4715 int ret;
4716
013d97e9
FR		 4717 /*
4718 * ctl->data points to idev->cnf.disable_ipv6, we should
4719 * not modify it until we get the rtnl lock.
4720 */
4721 lctl = *ctl;
4722 lctl.data = &val;
4723
4724 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 4725
4726 if (write)
4727 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4728 if (ret)
4729 *ppos = pos;
56d417b1
BH		 4730 return ret;
4731}
4732
1da177e4
LT		 4733static struct addrconf_sysctl_table
4734{
4735 struct ctl_table_header *sysctl_header;
f6a07b29 4736 ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 4737} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4738 .sysctl_header = NULL,
4739 .addrconf_vars = {
1ab1457c 4740 {
e21e8467
SH		 4741 .procname = "forwarding",
4742 .data = &ipv6_devconf.forwarding,
4743 .maxlen = sizeof(int),
4744 .mode = 0644,
4745 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4746 },
4747 {
e21e8467
SH		 4748 .procname = "hop_limit",
4749 .data = &ipv6_devconf.hop_limit,
4750 .maxlen = sizeof(int),
4751 .mode = 0644,
4752 .proc_handler = proc_dointvec,
1da177e4
LT		 4753 },
4754 {
e21e8467
SH		 4755 .procname = "mtu",
4756 .data = &ipv6_devconf.mtu6,
4757 .maxlen = sizeof(int),
4758 .mode = 0644,
4759 .proc_handler = proc_dointvec,
1da177e4
LT		 4760 },
4761 {
e21e8467
SH		 4762 .procname = "accept_ra",
4763 .data = &ipv6_devconf.accept_ra,
4764 .maxlen = sizeof(int),
4765 .mode = 0644,
4766 .proc_handler = proc_dointvec,
1da177e4
LT		 4767 },
4768 {
e21e8467
SH		 4769 .procname = "accept_redirects",
4770 .data = &ipv6_devconf.accept_redirects,
4771 .maxlen = sizeof(int),
4772 .mode = 0644,
4773 .proc_handler = proc_dointvec,
1da177e4
LT		 4774 },
4775 {
e21e8467
SH		 4776 .procname = "autoconf",
4777 .data = &ipv6_devconf.autoconf,
4778 .maxlen = sizeof(int),
4779 .mode = 0644,
4780 .proc_handler = proc_dointvec,
1da177e4
LT		 4781 },
4782 {
e21e8467
SH		 4783 .procname = "dad_transmits",
4784 .data = &ipv6_devconf.dad_transmits,
4785 .maxlen = sizeof(int),
4786 .mode = 0644,
4787 .proc_handler = proc_dointvec,
1da177e4
LT		 4788 },
4789 {
e21e8467
SH		 4790 .procname = "router_solicitations",
4791 .data = &ipv6_devconf.rtr_solicits,
4792 .maxlen = sizeof(int),
4793 .mode = 0644,
4794 .proc_handler = proc_dointvec,
1da177e4
LT		 4795 },
4796 {
e21e8467
SH		 4797 .procname = "router_solicitation_interval",
4798 .data = &ipv6_devconf.rtr_solicit_interval,
4799 .maxlen = sizeof(int),
4800 .mode = 0644,
4801 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4802 },
4803 {
e21e8467
SH		 4804 .procname = "router_solicitation_delay",
4805 .data = &ipv6_devconf.rtr_solicit_delay,
4806 .maxlen = sizeof(int),
4807 .mode = 0644,
4808 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4809 },
4810 {
e21e8467
SH		 4811 .procname = "force_mld_version",
4812 .data = &ipv6_devconf.force_mld_version,
4813 .maxlen = sizeof(int),
4814 .mode = 0644,
4815 .proc_handler = proc_dointvec,
1da177e4
LT		 4816 },
4817#ifdef CONFIG_IPV6_PRIVACY
4818 {
e21e8467
SH		 4819 .procname = "use_tempaddr",
4820 .data = &ipv6_devconf.use_tempaddr,
4821 .maxlen = sizeof(int),
4822 .mode = 0644,
4823 .proc_handler = proc_dointvec,
1da177e4
LT		 4824 },
4825 {
e21e8467
SH		 4826 .procname = "temp_valid_lft",
4827 .data = &ipv6_devconf.temp_valid_lft,
4828 .maxlen = sizeof(int),
4829 .mode = 0644,
4830 .proc_handler = proc_dointvec,
1da177e4
LT		 4831 },
4832 {
e21e8467
SH		 4833 .procname = "temp_prefered_lft",
4834 .data = &ipv6_devconf.temp_prefered_lft,
4835 .maxlen = sizeof(int),
4836 .mode = 0644,
4837 .proc_handler = proc_dointvec,
1da177e4
LT		 4838 },
4839 {
e21e8467
SH		 4840 .procname = "regen_max_retry",
4841 .data = &ipv6_devconf.regen_max_retry,
4842 .maxlen = sizeof(int),
4843 .mode = 0644,
4844 .proc_handler = proc_dointvec,
1da177e4
LT		 4845 },
4846 {
e21e8467
SH		 4847 .procname = "max_desync_factor",
4848 .data = &ipv6_devconf.max_desync_factor,
4849 .maxlen = sizeof(int),
4850 .mode = 0644,
4851 .proc_handler = proc_dointvec,
1da177e4
LT		 4852 },
4853#endif
4854 {
e21e8467
SH		 4855 .procname = "max_addresses",
4856 .data = &ipv6_devconf.max_addresses,
4857 .maxlen = sizeof(int),
4858 .mode = 0644,
4859 .proc_handler = proc_dointvec,
1da177e4 4860 },
65f5c7c1 4861 {
e21e8467
SH		 4862 .procname = "accept_ra_defrtr",
4863 .data = &ipv6_devconf.accept_ra_defrtr,
4864 .maxlen = sizeof(int),
4865 .mode = 0644,
4866 .proc_handler = proc_dointvec,
65f5c7c1 4867 },
c4fd30eb 4868 {
e21e8467
SH		 4869 .procname = "accept_ra_pinfo",
4870 .data = &ipv6_devconf.accept_ra_pinfo,
4871 .maxlen = sizeof(int),
4872 .mode = 0644,
4873 .proc_handler = proc_dointvec,
c4fd30eb 4874 },
930d6ff2
YH		 4875#ifdef CONFIG_IPV6_ROUTER_PREF
4876 {
e21e8467
SH		 4877 .procname = "accept_ra_rtr_pref",
4878 .data = &ipv6_devconf.accept_ra_rtr_pref,
4879 .maxlen = sizeof(int),
4880 .mode = 0644,
4881 .proc_handler = proc_dointvec,
930d6ff2 4882 },
52e16356 4883 {
e21e8467
SH		 4884 .procname = "router_probe_interval",
4885 .data = &ipv6_devconf.rtr_probe_interval,
4886 .maxlen = sizeof(int),
4887 .mode = 0644,
4888 .proc_handler = proc_dointvec_jiffies,
52e16356 4889 },
fa03ef38 4890#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4891 {
e21e8467
SH		 4892 .procname = "accept_ra_rt_info_max_plen",
4893 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4894 .maxlen = sizeof(int),
4895 .mode = 0644,
4896 .proc_handler = proc_dointvec,
09c884d4
YH		 4897 },
4898#endif
930d6ff2 4899#endif
fbea49e1 4900 {
e21e8467
SH		 4901 .procname = "proxy_ndp",
4902 .data = &ipv6_devconf.proxy_ndp,
4903 .maxlen = sizeof(int),
4904 .mode = 0644,
4905 .proc_handler = proc_dointvec,
fbea49e1 4906 },
0bcbc926 4907 {
e21e8467
SH		 4908 .procname = "accept_source_route",
4909 .data = &ipv6_devconf.accept_source_route,
4910 .maxlen = sizeof(int),
4911 .mode = 0644,
4912 .proc_handler = proc_dointvec,
0bcbc926 4913 },
95c385b4
NH		 4914#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4915 {
e21e8467
SH		 4916 .procname = "optimistic_dad",
4917 .data = &ipv6_devconf.optimistic_dad,
4918 .maxlen = sizeof(int),
4919 .mode = 0644,
4920 .proc_handler = proc_dointvec,
95c385b4
NH		 4921
4922 },
7bc570c8
YH		 4923#endif
4924#ifdef CONFIG_IPV6_MROUTE
4925 {
e21e8467
SH		 4926 .procname = "mc_forwarding",
4927 .data = &ipv6_devconf.mc_forwarding,
4928 .maxlen = sizeof(int),
4929 .mode = 0444,
4930 .proc_handler = proc_dointvec,
7bc570c8 4931 },
95c385b4 4932#endif
778d80be 4933 {
e21e8467
SH		 4934 .procname = "disable_ipv6",
4935 .data = &ipv6_devconf.disable_ipv6,
4936 .maxlen = sizeof(int),
4937 .mode = 0644,
4938 .proc_handler = addrconf_sysctl_disable,
778d80be 4939 },
1b34be74 4940 {
e21e8467
SH		 4941 .procname = "accept_dad",
4942 .data = &ipv6_devconf.accept_dad,
4943 .maxlen = sizeof(int),
4944 .mode = 0644,
4945 .proc_handler = proc_dointvec,
1b34be74 4946 },
f7734fdf 4947 {
f7734fdf
OP		 4948 .procname = "force_tllao",
4949 .data = &ipv6_devconf.force_tllao,
4950 .maxlen = sizeof(int),
4951 .mode = 0644,
4952 .proc_handler = proc_dointvec
4953 },
5cb04436
HFS		 4954 {
4955 .procname = "ndisc_notify",
4956 .data = &ipv6_devconf.ndisc_notify,
4957 .maxlen = sizeof(int),
4958 .mode = 0644,
4959 .proc_handler = proc_dointvec
4960 },
1da177e4 4961 {
f8572d8f 4962 /* sentinel */
1da177e4
LT		 4963 }
4964 },
1da177e4
LT		 4965};
4966
bff16c2f 4967static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4968 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4969{
4970 int i;
1da177e4 4971 struct addrconf_sysctl_table *t;
6105e293 4972 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 4973
af879cc7 4974 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4975 if (t == NULL)
f68635e6
PE		 4976 goto out;
4977
bcdd553f 4978 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 4979 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 4980 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4981 t->addrconf_vars[i].extra2 = net;
1da177e4 4982 }
1da177e4 4983
6105e293 4984 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 4985
6105e293 4986 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
1da177e4 4987 if (t->sysctl_header == NULL)
6105e293 4988 goto free;
f68635e6
PE		 4989
4990 p->sysctl = t;
95897312 4991 return 0;
1da177e4 4992
f68635e6 4993free:
1da177e4 4994 kfree(t);
f68635e6 4995out:
95897312 4996 return -ENOBUFS;
1da177e4
LT		 4997}
4998
408c4768
PE		 4999static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5000{
5001 struct addrconf_sysctl_table *t;
5002
5003 if (p->sysctl == NULL)
5004 return;
5005
5006 t = p->sysctl;
5007 p->sysctl = NULL;
ff538818 5008 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 5009 kfree(t);
5010}
5011
f52295a9
PE		 5012static void addrconf_sysctl_register(struct inet6_dev *idev)
5013{
54716e3b 5014 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 5015 &ndisc_ifinfo_sysctl_change);
c346dca1 5016 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 5017 idev, &idev->cnf);
f52295a9
PE		 5018}
5019
408c4768 5020static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 5021{
408c4768
PE		 5022 __addrconf_sysctl_unregister(&idev->cnf);
5023 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 5024}
5025
5026
5027#endif
5028
2c8c1e72 5029static int __net_init addrconf_init_net(struct net *net)
e0da5a48 5030{
a79ca223 5031 int err = -ENOMEM;
e0da5a48
PE		 5032 struct ipv6_devconf *all, *dflt;
5033
a79ca223
HZ		 5034 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5035 if (all == NULL)
5036 goto err_alloc_all;
e0da5a48 5037
a79ca223
HZ		 5038 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5039 if (dflt == NULL)
5040 goto err_alloc_dflt;
e0da5a48 5041
a79ca223
HZ		 5042 /* these will be inherited by all namespaces */
5043 dflt->autoconf = ipv6_defaults.autoconf;
5044 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 5045
5046 net->ipv6.devconf_all = all;
5047 net->ipv6.devconf_dflt = dflt;
5048
5049#ifdef CONFIG_SYSCTL
f8572d8f 5050 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 5051 if (err < 0)
5052 goto err_reg_all;
5053
f8572d8f 5054 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 5055 if (err < 0)
5056 goto err_reg_dflt;
5057#endif
5058 return 0;
5059
5060#ifdef CONFIG_SYSCTL
5061err_reg_dflt:
5062 __addrconf_sysctl_unregister(all);
5063err_reg_all:
5064 kfree(dflt);
5065#endif
5066err_alloc_dflt:
5067 kfree(all);
5068err_alloc_all:
5069 return err;
5070}
5071
2c8c1e72 5072static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 5073{
5074#ifdef CONFIG_SYSCTL
5075 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5076 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5077#endif
09ad9bc7 5078 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 5079 kfree(net->ipv6.devconf_dflt);
5080 kfree(net->ipv6.devconf_all);
5081 }
5082}
5083
5084static struct pernet_operations addrconf_ops = {
5085 .init = addrconf_init_net,
5086 .exit = addrconf_exit_net,
5087};
5088
b382b191
TG		 5089static struct rtnl_af_ops inet6_ops = {
5090 .family = AF_INET6,
5091 .fill_link_af = inet6_fill_link_af,
5092 .get_link_af_size = inet6_get_link_af_size,
f53adae4 5093 .set_link_af = inet6_set_link_af,
b382b191
TG		 5094};
5095
1da177e4
LT		 5096/*
5097 * Init / cleanup code
5098 */
5099
5100int __init addrconf_init(void)
5101{
c2e21293 5102 int i, err;
2a8cc6c8 5103
e21e8467
SH		 5104 err = ipv6_addr_label_init();
5105 if (err < 0) {
f3213831
JP		 5106 pr_crit("%s: cannot initialize default policy table: %d\n",
5107 __func__, err);
2cc6d2bf 5108 goto out;
2a8cc6c8 5109 }
1da177e4 5110
2cc6d2bf
NH		 5111 err = register_pernet_subsys(&addrconf_ops);
5112 if (err < 0)
5113 goto out_addrlabel;
e0da5a48 5114
1da177e4
LT		 5115 /* The addrconf netdev notifier requires that loopback_dev
5116 * has it's ipv6 private information allocated and setup
5117 * before it can bring up and give link-local addresses
5118 * to other devices which are up.
5119 *
5120 * Unfortunately, loopback_dev is not necessarily the first
5121 * entry in the global dev_base list of net devices. In fact,
5122 * it is likely to be the very last entry on that list.
5123 * So this causes the notifier registry below to try and
5124 * give link-local addresses to all devices besides loopback_dev
5125 * first, then loopback_dev, which cases all the non-loopback_dev
5126 * devices to fail to get a link-local address.
5127 *
5128 * So, as a temporary fix, allocate the ipv6 structure for
5129 * loopback_dev first by hand.
5130 * Longer term, all of the dependencies ipv6 has upon the loopback
5131 * device and it being up should be removed.
5132 */
5133 rtnl_lock();
2774c7ab 5134 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 5135 err = -ENOMEM;
5136 rtnl_unlock();
5137 if (err)
e0da5a48 5138 goto errlo;
1da177e4 5139
c2e21293 5140 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5141 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5142
1da177e4
LT		 5143 register_netdevice_notifier(&ipv6_dev_notf);
5144
1da177e4 5145 addrconf_verify(0);
c127ea2c 5146
b382b191
TG		 5147 err = rtnl_af_register(&inet6_ops);
5148 if (err < 0)
5149 goto errout_af;
5150
c7ac8679
GR		 5151 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5152 NULL);
c127ea2c
TG		 5153 if (err < 0)
5154 goto errout;
5155
5156 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 5157 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5158 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5159 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5160 inet6_dump_ifaddr, NULL);
5161 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5162 inet6_dump_ifmcaddr, NULL);
5163 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5164 inet6_dump_ifacaddr, NULL);
76f8f6cb 5165 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 5166 inet6_netconf_dump_devconf, NULL);
c127ea2c 5167
2a8cc6c8
YH		 5168 ipv6_addr_label_rtnl_register();
5169
1da177e4 5170 return 0;
c127ea2c 5171errout:
b382b191
TG		 5172 rtnl_af_unregister(&inet6_ops);
5173errout_af:
c127ea2c 5174 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 5175errlo:
5176 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 5177out_addrlabel:
5178 ipv6_addr_label_cleanup();
5179out:
c127ea2c 5180 return err;
1da177e4
LT		 5181}
5182
09f7709f 5183void addrconf_cleanup(void)
1da177e4 5184{
176c39af 5185 struct net_device *dev;
1da177e4
LT		 5186 int i;
5187
5188 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5189 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 5190 ipv6_addr_label_cleanup();
1da177e4
LT		 5191
5192 rtnl_lock();
5193
b382b191
TG		 5194 __rtnl_af_unregister(&inet6_ops);
5195
176c39af
DL		 5196 /* clean dev list */
5197 for_each_netdev(&init_net, dev) {
5198 if (__in6_dev_get(dev) == NULL)
5199 continue;
5200 addrconf_ifdown(dev, 1);
5201 }
5202 addrconf_ifdown(init_net.loopback_dev, 2);
5203
1da177e4
LT		 5204 /*
5205 * Check hash table.
5206 */
5c578aed 5207 spin_lock_bh(&addrconf_hash_lock);
c2e21293 5208 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5209 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 5210 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 5211
5212 del_timer(&addr_chk_timer);
1da177e4 5213 rtnl_unlock();
1da177e4 5214}
Linux kernel - Deliverables
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