projects / linux-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
mlx4: allow order-0 memory allocations in RX path
[linux-block.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
1da177e4
LT		 46#include <linux/socket.h>
47#include <linux/sockios.h>
1da177e4
LT		 48#include <linux/net.h>
49#include <linux/in6.h>
50#include <linux/netdevice.h>
1823730f 51#include <linux/if_addr.h>
1da177e4
LT		 52#include <linux/if_arp.h>
53#include <linux/if_arcnet.h>
54#include <linux/if_infiniband.h>
55#include <linux/route.h>
56#include <linux/inetdevice.h>
57#include <linux/init.h>
5a0e3ad6 58#include <linux/slab.h>
1da177e4
LT		 59#ifdef CONFIG_SYSCTL
60#include <linux/sysctl.h>
61#endif
4fc268d2 62#include <linux/capability.h>
1da177e4
LT		 63#include <linux/delay.h>
64#include <linux/notifier.h>
543537bd 65#include <linux/string.h>
ddbe5032 66#include <linux/hash.h>
1da177e4 67
457c4cbc 68#include <net/net_namespace.h>
1da177e4
LT		 69#include <net/sock.h>
70#include <net/snmp.h>
71
06a4c1c5 72#include <net/af_ieee802154.h>
cb6bf355 73#include <net/firewire.h>
1da177e4
LT		 74#include <net/ipv6.h>
75#include <net/protocol.h>
76#include <net/ndisc.h>
77#include <net/ip6_route.h>
78#include <net/addrconf.h>
79#include <net/tcp.h>
80#include <net/ip.h>
5d620266 81#include <net/netlink.h>
f24e3d65 82#include <net/pkt_sched.h>
1da177e4
LT		 83#include <linux/if_tunnel.h>
84#include <linux/rtnetlink.h>
f3a1bfb1 85#include <linux/netconf.h>
1da177e4
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
aee80b54 2763 ASSERT_RTNL();
2764
2765 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2766 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 2767 return;
2768 }
2769
2770 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2771 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2772
2773 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2774 addrconf_add_linklocal(idev, &addr);
2775}
2776#endif
2777
1da177e4
LT		 2778static inline int
2779ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2780{
2781 struct in6_addr lladdr;
2782
95c385b4 2783 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2784 addrconf_add_linklocal(idev, &lladdr);
2785 return 0;
2786 }
2787 return -1;
2788}
2789
2790static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2791{
2792 struct net_device *link_dev;
c346dca1 2793 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2794
2795 /* first try to inherit the link-local address from the link device */
2796 if (idev->dev->iflink &&
6fda7350 2797 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2798 if (!ipv6_inherit_linklocal(idev, link_dev))
2799 return;
2800 }
2801 /* then try to inherit it from any device */
6fda7350 2802 for_each_netdev(net, link_dev) {
1da177e4
LT		 2803 if (!ipv6_inherit_linklocal(idev, link_dev))
2804 return;
2805 }
91df42be 2806 pr_debug("init ip6-ip6: add_linklocal failed\n");
1da177e4
LT		 2807}
2808
2809/*
2810 * Autoconfigure tunnel with a link-local address so routing protocols,
2811 * DHCPv6, MLD etc. can be run over the virtual link
2812 */
2813
2814static void addrconf_ip6_tnl_config(struct net_device *dev)
2815{
2816 struct inet6_dev *idev;
2817
2818 ASSERT_RTNL();
2819
e21e8467 2820 idev = addrconf_add_dev(dev);
64e724f6 2821 if (IS_ERR(idev)) {
91df42be 2822 pr_debug("init ip6-ip6: add_dev failed\n");
1da177e4
LT		 2823 return;
2824 }
2825 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2826}
2827
1ab1457c 2828static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 2829 void *ptr)
1da177e4 2830{
351638e7 2831 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 2832 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2833 int run_pending = 0;
b217d616 2834 int err;
1da177e4 2835
e21e8467 2836 switch (event) {
45ba9dd2 2837 case NETDEV_REGISTER:
74235a25 2838 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2839 idev = ipv6_add_dev(dev);
2840 if (!idev)
b217d616 2841 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2842 }
2843 break;
bcdd553f 2844
1da177e4 2845 case NETDEV_UP:
3c21edbd 2846 case NETDEV_CHANGE:
c2edacf8
JV		 2847 if (dev->flags & IFF_SLAVE)
2848 break;
2849
3c21edbd 2850 if (event == NETDEV_UP) {
f24e3d65 2851 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 2852 /* device is not ready yet. */
f3213831 2853 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 2854 dev->name);
2855 break;
2856 }
99081049 2857
d31c7b8f
EP		 2858 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2859 idev = ipv6_add_dev(dev);
2860
e3ec6cfc 2861 if (idev) {
99081049 2862 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2863 run_pending = 1;
2864 }
3c21edbd 2865 } else {
f24e3d65 2866 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2867 /* device is still not ready. */
2868 break;
2869 }
2870
2871 if (idev) {
bcdd553f 2872 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2873 /* device is already configured. */
2874 break;
3c21edbd
YH		 2875 idev->if_flags |= IF_READY;
2876 }
2877
f3213831
JP		 2878 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2879 dev->name);
3c21edbd 2880
c5e33bdd 2881 run_pending = 1;
3c21edbd
YH		 2882 }
2883
e21e8467 2884 switch (dev->type) {
07a93626 2885#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2886 case ARPHRD_SIT:
2887 addrconf_sit_config(dev);
2888 break;
aee80b54 2889#endif
07a93626 2890#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2891 case ARPHRD_IPGRE:
2892 addrconf_gre_config(dev);
2893 break;
0be669bb 2894#endif
1da177e4
LT		 2895 case ARPHRD_TUNNEL6:
2896 addrconf_ip6_tnl_config(dev);
2897 break;
2898 case ARPHRD_LOOPBACK:
2899 init_loopback(dev);
2900 break;
2901
2902 default:
2903 addrconf_dev_config(dev);
2904 break;
3ff50b79 2905 }
bcdd553f 2906
1da177e4 2907 if (idev) {
c5e33bdd
YH		 2908 if (run_pending)
2909 addrconf_dad_run(idev);
2910
bcdd553f
SH		 2911 /*
2912 * If the MTU changed during the interface down,
2913 * when the interface up, the changed MTU must be
2914 * reflected in the idev as well as routers.
1da177e4 2915 */
bcdd553f
SH		 2916 if (idev->cnf.mtu6 != dev->mtu &&
2917 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2918 rt6_mtu_change(dev, dev->mtu);
2919 idev->cnf.mtu6 = dev->mtu;
2920 }
2921 idev->tstamp = jiffies;
2922 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2923
2924 /*
2925 * If the changed mtu during down is lower than
2926 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2927 */
2928 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2929 addrconf_ifdown(dev, 1);
1da177e4
LT		 2930 }
2931 break;
2932
2933 case NETDEV_CHANGEMTU:
d31c7b8f 2934 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2935 rt6_mtu_change(dev, dev->mtu);
2936 idev->cnf.mtu6 = dev->mtu;
2937 break;
2938 }
2939
d31c7b8f
EP		 2940 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2941 idev = ipv6_add_dev(dev);
2942 if (idev)
2943 break;
2944 }
2945
bcdd553f
SH		 2946 /*
2947 * MTU falled under IPV6_MIN_MTU.
2948 * Stop IPv6 on this interface.
2949 */
1da177e4
LT		 2950
2951 case NETDEV_DOWN:
2952 case NETDEV_UNREGISTER:
2953 /*
2954 * Remove all addresses from this interface.
2955 */
2956 addrconf_ifdown(dev, event != NETDEV_DOWN);
2957 break;
3c21edbd 2958
1da177e4 2959 case NETDEV_CHANGENAME:
1da177e4 2960 if (idev) {
5632c515 2961 snmp6_unregister_dev(idev);
408c4768 2962 addrconf_sysctl_unregister(idev);
f52295a9 2963 addrconf_sysctl_register(idev);
b217d616
HX		 2964 err = snmp6_register_dev(idev);
2965 if (err)
2966 return notifier_from_errno(err);
5632c515 2967 }
1da177e4 2968 break;
bcdd553f 2969
93d9b7d7
JP		 2970 case NETDEV_PRE_TYPE_CHANGE:
2971 case NETDEV_POST_TYPE_CHANGE:
2972 addrconf_type_change(dev, event);
75c78500 2973 break;
3ff50b79 2974 }
1da177e4
LT		 2975
2976 return NOTIFY_OK;
2977}
2978
2979/*
2980 * addrconf module should be notified of a device going up
2981 */
2982static struct notifier_block ipv6_dev_notf = {
2983 .notifier_call = addrconf_notify,
1da177e4
LT		 2984};
2985
93d9b7d7 2986static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2987{
2988 struct inet6_dev *idev;
2989 ASSERT_RTNL();
2990
2991 idev = __in6_dev_get(dev);
2992
93d9b7d7 2993 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2994 ipv6_mc_remap(idev);
93d9b7d7 2995 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2996 ipv6_mc_unmap(idev);
2997}
2998
1da177e4
LT		 2999static int addrconf_ifdown(struct net_device *dev, int how)
3000{
c346dca1 3001 struct net *net = dev_net(dev);
502a2ffd 3002 struct inet6_dev *idev;
3003 struct inet6_ifaddr *ifa;
73a8bd74 3004 int state, i;
1da177e4
LT		 3005
3006 ASSERT_RTNL();
3007
73a8bd74
DM		 3008 rt6_ifdown(net, dev);
3009 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3010
3011 idev = __in6_dev_get(dev);
3012 if (idev == NULL)
3013 return -ENODEV;
3014
bcdd553f
SH		 3015 /*
3016 * Step 1: remove reference to ipv6 device from parent device.
3017 * Do not dev_put!
1da177e4 3018 */
439e2385 3019 if (how) {
1da177e4 3020 idev->dead = 1;
8814c4b5
YH		 3021
3022 /* protected by rtnl_lock */
a9b3cd7f 3023 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3024
3025 /* Step 1.5: remove snmp6 entry */
3026 snmp6_unregister_dev(idev);
3027
3028 }
3029
73a8bd74
DM		 3030 /* Step 2: clear hash table */
3031 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3032 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3033
3034 spin_lock_bh(&addrconf_hash_lock);
3035 restart:
b67bfe0d 3036 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74
DM		 3037 if (ifa->idev == idev) {
3038 hlist_del_init_rcu(&ifa->addr_lst);
3039 addrconf_del_timer(ifa);
3040 goto restart;
3041 }
3042 }
3043 spin_unlock_bh(&addrconf_hash_lock);
3044 }
3045
1da177e4
LT		 3046 write_lock_bh(&idev->lock);
3047
bcdd553f 3048 /* Step 2: clear flags for stateless addrconf */
439e2385 3049 if (!how)
3c21edbd 3050 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3051
1da177e4 3052#ifdef CONFIG_IPV6_PRIVACY
439e2385 3053 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 3054 in6_dev_put(idev);
3055
bcdd553f 3056 /* Step 3: clear tempaddr list */
372e6c8f 3057 while (!list_empty(&idev->tempaddr_list)) {
3058 ifa = list_first_entry(&idev->tempaddr_list,
3059 struct inet6_ifaddr, tmp_list);
3060 list_del(&ifa->tmp_list);
1da177e4
LT		 3061 write_unlock_bh(&idev->lock);
3062 spin_lock_bh(&ifa->lock);
3063
3064 if (ifa->ifpub) {
3065 in6_ifa_put(ifa->ifpub);
3066 ifa->ifpub = NULL;
3067 }
3068 spin_unlock_bh(&ifa->lock);
3069 in6_ifa_put(ifa);
3070 write_lock_bh(&idev->lock);
3071 }
3072#endif
8f37ada5 3073
502a2ffd 3074 while (!list_empty(&idev->addr_list)) {
3075 ifa = list_first_entry(&idev->addr_list,
3076 struct inet6_ifaddr, if_list);
84e8b803 3077 addrconf_del_timer(ifa);
3078
73a8bd74 3079 list_del(&ifa->if_list);
84e8b803 3080
73a8bd74 3081 write_unlock_bh(&idev->lock);
84e8b803 3082
73a8bd74
DM		 3083 spin_lock_bh(&ifa->state_lock);
3084 state = ifa->state;
3085 ifa->state = INET6_IFADDR_STATE_DEAD;
3086 spin_unlock_bh(&ifa->state_lock);
9d82ca98 3087
73a8bd74
DM		 3088 if (state != INET6_IFADDR_STATE_DEAD) {
3089 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3090 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 3091 }
73a8bd74 3092 in6_ifa_put(ifa);
8f37ada5 3093
73a8bd74
DM		 3094 write_lock_bh(&idev->lock);
3095 }
8f37ada5 3096
1da177e4
LT		 3097 write_unlock_bh(&idev->lock);
3098
3099 /* Step 5: Discard multicast list */
439e2385 3100 if (how)
1da177e4
LT		 3101 ipv6_mc_destroy_dev(idev);
3102 else
3103 ipv6_mc_down(idev);
3104
1da177e4 3105 idev->tstamp = jiffies;
1ab1457c 3106
bcdd553f 3107 /* Last: Shot the device (if unregistered) */
439e2385 3108 if (how) {
408c4768 3109 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3110 neigh_parms_release(&nd_tbl, idev->nd_parms);
3111 neigh_ifdown(&nd_tbl, dev);
3112 in6_dev_put(idev);
3113 }
3114 return 0;
3115}
3116
3117static void addrconf_rs_timer(unsigned long data)
3118{
3119 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
5b2a1953 3120 struct inet6_dev *idev = ifp->idev;
1da177e4 3121
5b2a1953 3122 read_lock(&idev->lock);
3123 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3124 goto out;
3125
9ba2add3 3126 if (!ipv6_accept_ra(idev))
5b2a1953 3127 goto out;
3128
3129 /* Announcement received after solicitation was sent */
3130 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3131 goto out;
1da177e4
LT		 3132
3133 spin_lock(&ifp->lock);
5b2a1953 3134 if (ifp->probes++ < idev->cnf.rtr_solicits) {
1da177e4
LT		 3135 /* The wait after the last probe can be shorter */
3136 addrconf_mod_timer(ifp, AC_RS,
5b2a1953 3137 (ifp->probes == idev->cnf.rtr_solicits) ?
3138 idev->cnf.rtr_solicit_delay :
3139 idev->cnf.rtr_solicit_interval);
1da177e4
LT		 3140 spin_unlock(&ifp->lock);
3141
5b2a1953 3142 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 3143 } else {
3144 spin_unlock(&ifp->lock);
3145 /*
3146 * Note: we do not support deprecated "all on-link"
3147 * assumption any longer.
3148 */
91df42be 3149 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3150 }
3151
3152out:
5b2a1953 3153 read_unlock(&idev->lock);
1da177e4
LT		 3154 in6_ifa_put(ifp);
3155}
3156
3157/*
3158 * Duplicate Address Detection
3159 */
3c21edbd
YH		 3160static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3161{
3162 unsigned long rand_num;
3163 struct inet6_dev *idev = ifp->idev;
3164
95c385b4
NH		 3165 if (ifp->flags & IFA_F_OPTIMISTIC)
3166 rand_num = 0;
3167 else
3168 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3169
3c21edbd
YH		 3170 ifp->probes = idev->cnf.dad_transmits;
3171 addrconf_mod_timer(ifp, AC_DAD, rand_num);
3172}
3173
cf22f9a2 3174static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4
LT		 3175{
3176 struct inet6_dev *idev = ifp->idev;
3177 struct net_device *dev = idev->dev;
1da177e4
LT		 3178
3179 addrconf_join_solict(dev, &ifp->addr);
3180
1da177e4 3181 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 3182
3183 read_lock_bh(&idev->lock);
622ccdf1 3184 spin_lock(&ifp->lock);
e9d3e084 3185 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3186 goto out;
1da177e4
LT		 3187
3188 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3189 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3190 !(ifp->flags&IFA_F_TENTATIVE) ||
3191 ifp->flags & IFA_F_NODAD) {
cc411d0b 3192 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3193 spin_unlock(&ifp->lock);
1da177e4
LT		 3194 read_unlock_bh(&idev->lock);
3195
3196 addrconf_dad_completed(ifp);
3197 return;
3198 }
3199
6732bade 3200 if (!(idev->if_flags & IF_READY)) {
21809faf 3201 spin_unlock(&ifp->lock);
6732bade 3202 read_unlock_bh(&idev->lock);
3c21edbd 3203 /*
590a9887 3204 * If the device is not ready:
3c21edbd
YH		 3205 * - keep it tentative if it is a permanent address.
3206 * - otherwise, kill it.
3207 */
3208 in6_ifa_hold(ifp);
cc411d0b 3209 addrconf_dad_stop(ifp, 0);
6732bade 3210 return;
3c21edbd 3211 }
95c385b4
NH		 3212
3213 /*
3214 * Optimistic nodes can start receiving
3215 * Frames right away
3216 */
e21e8467 3217 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 3218 ip6_ins_rt(ifp->rt);
3219
6732bade 3220 addrconf_dad_kick(ifp);
1da177e4 3221out:
622ccdf1 3222 spin_unlock(&ifp->lock);
1da177e4
LT		 3223 read_unlock_bh(&idev->lock);
3224}
3225
3226static void addrconf_dad_timer(unsigned long data)
3227{
3228 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3229 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3230 struct in6_addr mcaddr;
3231
f2344a13
HX		 3232 if (!ifp->probes && addrconf_dad_end(ifp))
3233 goto out;
3234
122e4519 3235 read_lock(&idev->lock);
3236 if (idev->dead || !(idev->if_flags & IF_READY)) {
3237 read_unlock(&idev->lock);
1da177e4
LT		 3238 goto out;
3239 }
21809faf 3240
3241 spin_lock(&ifp->lock);
622ccdf1
HX		 3242 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3243 spin_unlock(&ifp->lock);
3244 read_unlock(&idev->lock);
3245 goto out;
3246 }
3247
1da177e4
LT		 3248 if (ifp->probes == 0) {
3249 /*
3250 * DAD was successful
3251 */
3252
cc411d0b 3253 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3254 spin_unlock(&ifp->lock);
122e4519 3255 read_unlock(&idev->lock);
1da177e4
LT		 3256
3257 addrconf_dad_completed(ifp);
3258
3259 goto out;
3260 }
3261
3262 ifp->probes--;
3263 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
21809faf 3264 spin_unlock(&ifp->lock);
122e4519 3265 read_unlock(&idev->lock);
1da177e4
LT		 3266
3267 /* send a neighbour solicitation for our addr */
1da177e4 3268 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3269 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3270out:
3271 in6_ifa_put(ifp);
3272}
3273
3274static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3275{
e21e8467 3276 struct net_device *dev = ifp->idev->dev;
1da177e4
LT		 3277
3278 /*
3279 * Configure the address for reception. Now it is valid.
3280 */
3281
3282 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3283
026359bc
TA		 3284 /* If added prefix is link local and we are prepared to process
3285 router advertisements, start sending router solicitations.
1da177e4
LT		 3286 */
3287
aeaf6e9d 3288 if (ipv6_accept_ra(ifp->idev) &&
1da177e4
LT		 3289 ifp->idev->cnf.rtr_solicits > 0 &&
3290 (dev->flags&IFF_LOOPBACK) == 0 &&
3291 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 3292 /*
3293 * If a host as already performed a random delay
3294 * [...] as part of DAD [...] there is no need
3295 * to delay again before sending the first RS
3296 */
f3ee4010 3297 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 3298
3299 spin_lock_bh(&ifp->lock);
3300 ifp->probes = 1;
3301 ifp->idev->if_flags |= IF_RS_SENT;
3302 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3303 spin_unlock_bh(&ifp->lock);
3304 }
3305}
3306
e21e8467
SH		 3307static void addrconf_dad_run(struct inet6_dev *idev)
3308{
c5e33bdd
YH		 3309 struct inet6_ifaddr *ifp;
3310
3311 read_lock_bh(&idev->lock);
502a2ffd 3312 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3313 spin_lock(&ifp->lock);
f2344a13
HX		 3314 if (ifp->flags & IFA_F_TENTATIVE &&
3315 ifp->state == INET6_IFADDR_STATE_DAD)
3316 addrconf_dad_kick(ifp);
21809faf 3317 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3318 }
3319 read_unlock_bh(&idev->lock);
3320}
3321
1da177e4
LT		 3322#ifdef CONFIG_PROC_FS
3323struct if6_iter_state {
3c40090a 3324 struct seq_net_private p;
1da177e4 3325 int bucket;
1d578303 3326 int offset;
1da177e4
LT		 3327};
3328
1d578303 3329static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3330{
3331 struct inet6_ifaddr *ifa = NULL;
3332 struct if6_iter_state *state = seq->private;
1218854a 3333 struct net *net = seq_file_net(seq);
1d578303 3334 int p = 0;
1da177e4 3335
1d578303
MM		 3336 /* initial bucket if pos is 0 */
3337 if (pos == 0) {
3338 state->bucket = 0;
3339 state->offset = 0;
3340 }
3341
3342 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3343 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3344 addr_lst) {
9f0d3c27
ED		 3345 if (!net_eq(dev_net(ifa->idev->dev), net))
3346 continue;
1d578303
MM		 3347 /* sync with offset */
3348 if (p < state->offset) {
3349 p++;
3350 continue;
3351 }
3352 state->offset++;
9f0d3c27 3353 return ifa;
1d578303
MM		 3354 }
3355
3356 /* prepare for next bucket */
3357 state->offset = 0;
3358 p = 0;
1da177e4 3359 }
c2e21293 3360 return NULL;
1da177e4
LT		 3361}
3362
c2e21293 3363static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3364 struct inet6_ifaddr *ifa)
1da177e4
LT		 3365{
3366 struct if6_iter_state *state = seq->private;
1218854a 3367 struct net *net = seq_file_net(seq);
1da177e4 3368
b67bfe0d 3369 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3370 if (!net_eq(dev_net(ifa->idev->dev), net))
3371 continue;
1d578303 3372 state->offset++;
9f0d3c27 3373 return ifa;
1d578303 3374 }
3c40090a 3375
c2e21293 3376 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3377 state->offset = 0;
b67bfe0d 3378 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3379 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3380 if (!net_eq(dev_net(ifa->idev->dev), net))
3381 continue;
1d578303 3382 state->offset++;
9f0d3c27 3383 return ifa;
c2e21293 3384 }
1da177e4 3385 }
3c40090a 3386
c2e21293 3387 return NULL;
1da177e4
LT		 3388}
3389
1da177e4 3390static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3391 __acquires(rcu_bh)
1da177e4 3392{
5c578aed 3393 rcu_read_lock_bh();
1d578303 3394 return if6_get_first(seq, *pos);
1da177e4
LT		 3395}
3396
3397static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3398{
3399 struct inet6_ifaddr *ifa;
3400
3401 ifa = if6_get_next(seq, v);
3402 ++*pos;
3403 return ifa;
3404}
3405
3406static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3407 __releases(rcu_bh)
1da177e4 3408{
5c578aed 3409 rcu_read_unlock_bh();
1da177e4
LT		 3410}
3411
3412static int if6_seq_show(struct seq_file *seq, void *v)
3413{
3414 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3415 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3416 &ifp->addr,
1da177e4
LT		 3417 ifp->idev->dev->ifindex,
3418 ifp->prefix_len,
3419 ifp->scope,
3420 ifp->flags,
3421 ifp->idev->dev->name);
3422 return 0;
3423}
3424
56b3d975 3425static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3426 .start = if6_seq_start,
3427 .next = if6_seq_next,
3428 .show = if6_seq_show,
3429 .stop = if6_seq_stop,
3430};
3431
3432static int if6_seq_open(struct inode *inode, struct file *file)
3433{
3c40090a
DL		 3434 return seq_open_net(inode, file, &if6_seq_ops,
3435 sizeof(struct if6_iter_state));
1da177e4
LT		 3436}
3437
9a32144e 3438static const struct file_operations if6_fops = {
1da177e4
LT		 3439 .owner = THIS_MODULE,
3440 .open = if6_seq_open,
3441 .read = seq_read,
3442 .llseek = seq_lseek,
3c40090a 3443 .release = seq_release_net,
1da177e4
LT		 3444};
3445
2c8c1e72 3446static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3447{
d4beaa66 3448 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 3449 return -ENOMEM;
3450 return 0;
3451}
3452
2c8c1e72 3453static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 3454{
ece31ffd 3455 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 3456}
3457
3458static struct pernet_operations if6_proc_net_ops = {
3459 .init = if6_proc_net_init,
3460 .exit = if6_proc_net_exit,
3461};
3462
3463int __init if6_proc_init(void)
3464{
3465 return register_pernet_subsys(&if6_proc_net_ops);
3466}
3467
1da177e4
LT		 3468void if6_proc_exit(void)
3469{
3c40090a 3470 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3471}
3472#endif /* CONFIG_PROC_FS */
3473
07a93626 3474#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3475/* Check if address is a home address configured on any interface. */
b71d1d42 3476int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3477{
3478 int ret = 0;
c2e21293 3479 struct inet6_ifaddr *ifp = NULL;
ddbe5032 3480 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3481
5c578aed 3482 rcu_read_lock_bh();
b67bfe0d 3483 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 3484 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3485 continue;
caad295f 3486 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3487 (ifp->flags & IFA_F_HOMEADDRESS)) {
3488 ret = 1;
3489 break;
3490 }
3491 }
5c578aed 3492 rcu_read_unlock_bh();
3b9f9a1c
NT		 3493 return ret;
3494}
3495#endif
3496
1da177e4
LT		 3497/*
3498 * Periodic address status verification
3499 */
3500
3501static void addrconf_verify(unsigned long foo)
3502{
b2db7564 3503 unsigned long now, next, next_sec, next_sched;
1da177e4 3504 struct inet6_ifaddr *ifp;
1da177e4
LT		 3505 int i;
3506
5c578aed 3507 rcu_read_lock_bh();
3508 spin_lock(&addrconf_verify_lock);
1da177e4 3509 now = jiffies;
b2db7564 3510 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4
LT		 3511
3512 del_timer(&addr_chk_timer);
3513
bcdd553f 3514 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3515restart:
b67bfe0d 3516 hlist_for_each_entry_rcu_bh(ifp,
5c578aed 3517 &inet6_addr_lst[i], addr_lst) {
1da177e4 3518 unsigned long age;
1da177e4
LT		 3519
3520 if (ifp->flags & IFA_F_PERMANENT)
3521 continue;
3522
3523 spin_lock(&ifp->lock);
b2db7564
YH		 3524 /* We try to batch several events at once. */
3525 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3526
8f27ebb9
YH		 3527 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3528 age >= ifp->valid_lft) {
1da177e4
LT		 3529 spin_unlock(&ifp->lock);
3530 in6_ifa_hold(ifp);
1da177e4
LT		 3531 ipv6_del_addr(ifp);
3532 goto restart;
8f27ebb9
YH		 3533 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3534 spin_unlock(&ifp->lock);
3535 continue;
1da177e4 3536 } else if (age >= ifp->prefered_lft) {
a1ed0526 3537 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3538 int deprecate = 0;
3539
3540 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3541 deprecate = 1;
3542 ifp->flags |= IFA_F_DEPRECATED;
3543 }
3544
3545 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3546 next = ifp->tstamp + ifp->valid_lft * HZ;
3547
3548 spin_unlock(&ifp->lock);
3549
3550 if (deprecate) {
3551 in6_ifa_hold(ifp);
1da177e4
LT		 3552
3553 ipv6_ifa_notify(0, ifp);
3554 in6_ifa_put(ifp);
3555 goto restart;
3556 }
3557#ifdef CONFIG_IPV6_PRIVACY
3558 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3559 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3560 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3561 ifp->idev->cnf.dad_transmits *
3562 ifp->idev->nd_parms->retrans_time / HZ;
3563
1da177e4
LT		 3564 if (age >= ifp->prefered_lft - regen_advance) {
3565 struct inet6_ifaddr *ifpub = ifp->ifpub;
3566 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3567 next = ifp->tstamp + ifp->prefered_lft * HZ;
3568 if (!ifp->regen_count && ifpub) {
3569 ifp->regen_count++;
3570 in6_ifa_hold(ifp);
3571 in6_ifa_hold(ifpub);
3572 spin_unlock(&ifp->lock);
5c578aed 3573
291d809b
HY		 3574 spin_lock(&ifpub->lock);
3575 ifpub->regen_count = 0;
3576 spin_unlock(&ifpub->lock);
1da177e4
LT		 3577 ipv6_create_tempaddr(ifpub, ifp);
3578 in6_ifa_put(ifpub);
3579 in6_ifa_put(ifp);
3580 goto restart;
3581 }
3582 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3583 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3584 spin_unlock(&ifp->lock);
3585#endif
3586 } else {
3587 /* ifp->prefered_lft <= ifp->valid_lft */
3588 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3589 next = ifp->tstamp + ifp->prefered_lft * HZ;
3590 spin_unlock(&ifp->lock);
3591 }
3592 }
1da177e4
LT		 3593 }
3594
b2db7564
YH		 3595 next_sec = round_jiffies_up(next);
3596 next_sched = next;
3597
3598 /* If rounded timeout is accurate enough, accept it. */
3599 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3600 next_sched = next_sec;
3601
3602 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3603 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3604 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3605
3606 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3607 now, next, next_sec, next_sched));
3608
3609 addr_chk_timer.expires = next_sched;
1da177e4 3610 add_timer(&addr_chk_timer);
5c578aed 3611 spin_unlock(&addrconf_verify_lock);
3612 rcu_read_unlock_bh();
1da177e4
LT		 3613}
3614
caeaba79
ND		 3615static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3616 struct in6_addr **peer_pfx)
461d8837
TG		 3617{
3618 struct in6_addr *pfx = NULL;
3619
caeaba79
ND		 3620 *peer_pfx = NULL;
3621
461d8837
TG		 3622 if (addr)
3623 pfx = nla_data(addr);
3624
3625 if (local) {
3626 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 3627 *peer_pfx = pfx;
3628 pfx = nla_data(local);
461d8837
TG		 3629 }
3630
3631 return pfx;
3632}
3633
ef7c79ed 3634static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3635 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3636 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3637 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3638};
3639
1da177e4 3640static int
661d2967 3641inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3642{
3b1e0a65 3643 struct net *net = sock_net(skb->sk);
b933f716
TG		 3644 struct ifaddrmsg *ifm;
3645 struct nlattr *tb[IFA_MAX+1];
caeaba79 3646 struct in6_addr *pfx, *peer_pfx;
b933f716 3647 int err;
1da177e4 3648
b933f716
TG		 3649 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3650 if (err < 0)
3651 return err;
3652
3653 ifm = nlmsg_data(nlh);
caeaba79 3654 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3655 if (pfx == NULL)
3656 return -EINVAL;
3657
af284937 3658 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3659}
3660
55ebaef1
NT		 3661static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3662 u32 prefered_lft, u32 valid_lft)
081bba5b 3663{
6f704992
YH		 3664 u32 flags;
3665 clock_t expires;
4bed72e4 3666 unsigned long timeout;
46d48046 3667
081bba5b
NT		 3668 if (!valid_lft || (prefered_lft > valid_lft))
3669 return -EINVAL;
3670
4bed72e4
YH		 3671 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3672 if (addrconf_finite_timeout(timeout)) {
3673 expires = jiffies_to_clock_t(timeout * HZ);
3674 valid_lft = timeout;
6f704992 3675 flags = RTF_EXPIRES;
4bed72e4
YH		 3676 } else {
3677 expires = 0;
3678 flags = 0;
3679 ifa_flags |= IFA_F_PERMANENT;
6f704992 3680 }
081bba5b 3681
4bed72e4
YH		 3682 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3683 if (addrconf_finite_timeout(timeout)) {
3684 if (timeout == 0)
3685 ifa_flags |= IFA_F_DEPRECATED;
3686 prefered_lft = timeout;
3687 }
081bba5b
NT		 3688
3689 spin_lock_bh(&ifp->lock);
3b9f9a1c 3690 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3691 ifp->tstamp = jiffies;
3692 ifp->valid_lft = valid_lft;
3693 ifp->prefered_lft = prefered_lft;
3694
3695 spin_unlock_bh(&ifp->lock);
3696 if (!(ifp->flags&IFA_F_TENTATIVE))
3697 ipv6_ifa_notify(0, ifp);
081bba5b 3698
46d48046 3699 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3700 expires, flags);
081bba5b
NT		 3701 addrconf_verify(0);
3702
3703 return 0;
3704}
3705
1da177e4 3706static int
661d2967 3707inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3708{
3b1e0a65 3709 struct net *net = sock_net(skb->sk);
461d8837
TG		 3710 struct ifaddrmsg *ifm;
3711 struct nlattr *tb[IFA_MAX+1];
caeaba79 3712 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 3713 struct inet6_ifaddr *ifa;
3714 struct net_device *dev;
55ebaef1
NT		 3715 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3716 u8 ifa_flags;
461d8837 3717 int err;
1da177e4 3718
461d8837
TG		 3719 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3720 if (err < 0)
3721 return err;
3722
3723 ifm = nlmsg_data(nlh);
caeaba79 3724 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3725 if (pfx == NULL)
3726 return -EINVAL;
3727
461d8837 3728 if (tb[IFA_CACHEINFO]) {
0778769d 3729 struct ifa_cacheinfo *ci;
461d8837
TG		 3730
3731 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3732 valid_lft = ci->ifa_valid;
461d8837
TG		 3733 preferred_lft = ci->ifa_prefered;
3734 } else {
3735 preferred_lft = INFINITY_LIFE_TIME;
3736 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3737 }
3738
af284937 3739 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3740 if (dev == NULL)
3741 return -ENODEV;
3742
55ebaef1 3743 /* We ignore other flags so far. */
3b9f9a1c 3744 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3745
1cab3da6 3746 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3747 if (ifa == NULL) {
3748 /*
3749 * It would be best to check for !NLM_F_CREATE here but
3750 * userspace alreay relies on not having to provide this.
3751 */
caeaba79 3752 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 3753 ifm->ifa_prefixlen, ifa_flags,
3754 preferred_lft, valid_lft);
081bba5b
NT		 3755 }
3756
7198f8ce
TG		 3757 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3758 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3759 err = -EEXIST;
3760 else
55ebaef1 3761 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3762
3763 in6_ifa_put(ifa);
3764
3765 return err;
1da177e4
LT		 3766}
3767
101bb229
TG		 3768static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3769 u8 scope, int ifindex)
3770{
3771 struct ifaddrmsg *ifm;
3772
3773 ifm = nlmsg_data(nlh);
3774 ifm->ifa_family = AF_INET6;
3775 ifm->ifa_prefixlen = prefixlen;
3776 ifm->ifa_flags = flags;
3777 ifm->ifa_scope = scope;
3778 ifm->ifa_index = ifindex;
3779}
3780
85486af0
TG		 3781static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3782 unsigned long tstamp, u32 preferred, u32 valid)
3783{
3784 struct ifa_cacheinfo ci;
3785
18a31e1e
TG		 3786 ci.cstamp = cstamp_delta(cstamp);
3787 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 3788 ci.ifa_prefered = preferred;
3789 ci.ifa_valid = valid;
3790
3791 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3792}
3793
101bb229
TG		 3794static inline int rt_scope(int ifa_scope)
3795{
3796 if (ifa_scope & IFA_HOST)
3797 return RT_SCOPE_HOST;
3798 else if (ifa_scope & IFA_LINK)
3799 return RT_SCOPE_LINK;
3800 else if (ifa_scope & IFA_SITE)
3801 return RT_SCOPE_SITE;
3802 else
3803 return RT_SCOPE_UNIVERSE;
3804}
3805
0ab6803b
TG		 3806static inline int inet6_ifaddr_msgsize(void)
3807{
339bf98f 3808 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 3809 + nla_total_size(16) /* IFA_LOCAL */
339bf98f
TG		 3810 + nla_total_size(16) /* IFA_ADDRESS */
3811 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3812}
c5396a31 3813
1da177e4 3814static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 3815 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3816{
1da177e4 3817 struct nlmsghdr *nlh;
85486af0 3818 u32 preferred, valid;
1da177e4 3819
15e47304 3820 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3821 if (nlh == NULL)
26932566 3822 return -EMSGSIZE;
0ab6803b 3823
101bb229
TG		 3824 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3825 ifa->idev->dev->ifindex);
3826
1da177e4 3827 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3828 preferred = ifa->prefered_lft;
3829 valid = ifa->valid_lft;
3830 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3831 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3832 if (preferred > tval)
3833 preferred -= tval;
3834 else
3835 preferred = 0;
f56619fc
BH		 3836 if (valid != INFINITY_LIFE_TIME) {
3837 if (valid > tval)
3838 valid -= tval;
3839 else
3840 valid = 0;
3841 }
1da177e4
LT		 3842 }
3843 } else {
85486af0
TG		 3844 preferred = INFINITY_LIFE_TIME;
3845 valid = INFINITY_LIFE_TIME;
3846 }
3847
7996c799 3848 if (!ipv6_addr_any(&ifa->peer_addr)) {
caeaba79
ND		 3849 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3850 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3851 goto error;
3852 } else
3853 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3854 goto error;
3855
3856 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3857 goto error;
1da177e4 3858
0ab6803b 3859 return nlmsg_end(skb, nlh);
caeaba79
ND		 3860
3861error:
3862 nlmsg_cancel(skb, nlh);
3863 return -EMSGSIZE;
1da177e4
LT		 3864}
3865
3866static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 3867 u32 portid, u32 seq, int event, u16 flags)
1da177e4 3868{
1da177e4 3869 struct nlmsghdr *nlh;
101bb229
TG		 3870 u8 scope = RT_SCOPE_UNIVERSE;
3871 int ifindex = ifmca->idev->dev->ifindex;
3872
3873 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3874 scope = RT_SCOPE_SITE;
1da177e4 3875
15e47304 3876 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3877 if (nlh == NULL)
26932566 3878 return -EMSGSIZE;
85486af0 3879
0ab6803b
TG		 3880 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3881 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3882 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3883 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3884 nlmsg_cancel(skb, nlh);
3885 return -EMSGSIZE;
3886 }
85486af0 3887
0ab6803b 3888 return nlmsg_end(skb, nlh);
1da177e4
LT		 3889}
3890
3891static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 3892 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3893{
1da177e4 3894 struct nlmsghdr *nlh;
101bb229
TG		 3895 u8 scope = RT_SCOPE_UNIVERSE;
3896 int ifindex = ifaca->aca_idev->dev->ifindex;
3897
3898 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3899 scope = RT_SCOPE_SITE;
1da177e4 3900
15e47304 3901 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3902 if (nlh == NULL)
26932566 3903 return -EMSGSIZE;
85486af0 3904
0ab6803b
TG		 3905 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3906 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3907 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3908 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3909 nlmsg_cancel(skb, nlh);
3910 return -EMSGSIZE;
3911 }
1da177e4 3912
0ab6803b 3913 return nlmsg_end(skb, nlh);
1da177e4
LT		 3914}
3915
e21e8467 3916enum addr_type_t {
1da177e4
LT		 3917 UNICAST_ADDR,
3918 MULTICAST_ADDR,
3919 ANYCAST_ADDR,
3920};
3921
234b27c3
ED		 3922/* called with rcu_read_lock() */
3923static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3924 struct netlink_callback *cb, enum addr_type_t type,
3925 int s_ip_idx, int *p_ip_idx)
3926{
234b27c3
ED		 3927 struct ifmcaddr6 *ifmca;
3928 struct ifacaddr6 *ifaca;
3929 int err = 1;
3930 int ip_idx = *p_ip_idx;
3931
3932 read_lock_bh(&idev->lock);
3933 switch (type) {
502a2ffd 3934 case UNICAST_ADDR: {
3935 struct inet6_ifaddr *ifa;
3936
234b27c3 3937 /* unicast address incl. temp addr */
502a2ffd 3938 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3939 if (++ip_idx < s_ip_idx)
234b27c3
ED		 3940 continue;
3941 err = inet6_fill_ifaddr(skb, ifa,
15e47304 3942 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3943 cb->nlh->nlmsg_seq,
3944 RTM_NEWADDR,
3945 NLM_F_MULTI);
3946 if (err <= 0)
3947 break;
63998ac2 3948 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 3949 }
3950 break;
502a2ffd 3951 }
234b27c3
ED		 3952 case MULTICAST_ADDR:
3953 /* multicast address */
3954 for (ifmca = idev->mc_list; ifmca;
3955 ifmca = ifmca->next, ip_idx++) {
3956 if (ip_idx < s_ip_idx)
3957 continue;
3958 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 3959 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3960 cb->nlh->nlmsg_seq,
3961 RTM_GETMULTICAST,
3962 NLM_F_MULTI);
3963 if (err <= 0)
3964 break;
3965 }
3966 break;
3967 case ANYCAST_ADDR:
3968 /* anycast address */
3969 for (ifaca = idev->ac_list; ifaca;
3970 ifaca = ifaca->aca_next, ip_idx++) {
3971 if (ip_idx < s_ip_idx)
3972 continue;
3973 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 3974 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3975 cb->nlh->nlmsg_seq,
3976 RTM_GETANYCAST,
3977 NLM_F_MULTI);
3978 if (err <= 0)
3979 break;
3980 }
3981 break;
3982 default:
3983 break;
3984 }
3985 read_unlock_bh(&idev->lock);
3986 *p_ip_idx = ip_idx;
3987 return err;
3988}
3989
1da177e4
LT		 3990static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3991 enum addr_type_t type)
3992{
234b27c3
ED		 3993 struct net *net = sock_net(skb->sk);
3994 int h, s_h;
1da177e4
LT		 3995 int idx, ip_idx;
3996 int s_idx, s_ip_idx;
1da177e4 3997 struct net_device *dev;
234b27c3
ED		 3998 struct inet6_dev *idev;
3999 struct hlist_head *head;
1ab1457c 4000
234b27c3
ED		 4001 s_h = cb->args[0];
4002 s_idx = idx = cb->args[1];
4003 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4004
234b27c3 4005 rcu_read_lock();
63998ac2 4006 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4007 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4008 idx = 0;
4009 head = &net->dev_index_head[h];
b67bfe0d 4010 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4011 if (idx < s_idx)
4012 goto cont;
4b97efdf 4013 if (h > s_h || idx > s_idx)
234b27c3
ED		 4014 s_ip_idx = 0;
4015 ip_idx = 0;
e21e8467
SH		 4016 idev = __in6_dev_get(dev);
4017 if (!idev)
234b27c3
ED		 4018 goto cont;
4019
4020 if (in6_dump_addrs(idev, skb, cb, type,
4021 s_ip_idx, &ip_idx) <= 0)
4022 goto done;
7562f876 4023cont:
234b27c3
ED		 4024 idx++;
4025 }
1da177e4 4026 }
234b27c3
ED		 4027done:
4028 rcu_read_unlock();
4029 cb->args[0] = h;
4030 cb->args[1] = idx;
4031 cb->args[2] = ip_idx;
4032
1da177e4
LT		 4033 return skb->len;
4034}
4035
4036static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4037{
4038 enum addr_type_t type = UNICAST_ADDR;
b854272b 4039
1da177e4
LT		 4040 return inet6_dump_addr(skb, cb, type);
4041}
4042
4043static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4044{
4045 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4046
1da177e4
LT		 4047 return inet6_dump_addr(skb, cb, type);
4048}
4049
4050
4051static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4052{
4053 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4054
1da177e4
LT		 4055 return inet6_dump_addr(skb, cb, type);
4056}
4057
661d2967 4058static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4059{
3b1e0a65 4060 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4061 struct ifaddrmsg *ifm;
4062 struct nlattr *tb[IFA_MAX+1];
caeaba79 4063 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4064 struct net_device *dev = NULL;
4065 struct inet6_ifaddr *ifa;
4066 struct sk_buff *skb;
6c223828
NT		 4067 int err;
4068
1b29fc2c
TG		 4069 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4070 if (err < 0)
4071 goto errout;
4072
caeaba79 4073 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
1b29fc2c
TG		 4074 if (addr == NULL) {
4075 err = -EINVAL;
4076 goto errout;
6c223828 4077 }
6c223828 4078
1b29fc2c 4079 ifm = nlmsg_data(nlh);
6c223828 4080 if (ifm->ifa_index)
6fda7350 4081 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4082
e21e8467
SH		 4083 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4084 if (!ifa) {
1b29fc2c
TG		 4085 err = -EADDRNOTAVAIL;
4086 goto errout;
4087 }
6c223828 4088
e21e8467
SH		 4089 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4090 if (!skb) {
6c223828 4091 err = -ENOBUFS;
1b29fc2c 4092 goto errout_ifa;
6c223828
NT		 4093 }
4094
15e47304 4095 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4096 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4097 if (err < 0) {
4098 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4099 WARN_ON(err == -EMSGSIZE);
4100 kfree_skb(skb);
4101 goto errout_ifa;
4102 }
15e47304 4103 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4104errout_ifa:
6c223828 4105 in6_ifa_put(ifa);
1b29fc2c 4106errout:
6c223828 4107 return err;
6c223828
NT		 4108}
4109
1da177e4
LT		 4110static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4111{
4112 struct sk_buff *skb;
c346dca1 4113 struct net *net = dev_net(ifa->idev->dev);
5d620266 4114 int err = -ENOBUFS;
1da177e4 4115
0ab6803b 4116 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 4117 if (skb == NULL)
4118 goto errout;
4119
4120 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4121 if (err < 0) {
4122 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4123 WARN_ON(err == -EMSGSIZE);
4124 kfree_skb(skb);
4125 goto errout;
4126 }
1ce85fe4
PNA		 4127 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4128 return;
5d620266
TG		 4129errout:
4130 if (err < 0)
6fda7350 4131 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4132}
4133
b6f99a21 4134static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4135 __s32 *array, int bytes)
4136{
04561c1f
TG		 4137 BUG_ON(bytes < (DEVCONF_MAX * 4));
4138
1da177e4
LT		 4139 memset(array, 0, bytes);
4140 array[DEVCONF_FORWARDING] = cnf->forwarding;
4141 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4142 array[DEVCONF_MTU6] = cnf->mtu6;
4143 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4144 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4145 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4146 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4147 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4148 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4149 jiffies_to_msecs(cnf->rtr_solicit_interval);
4150 array[DEVCONF_RTR_SOLICIT_DELAY] =
4151 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4
LT		 4152 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4153#ifdef CONFIG_IPV6_PRIVACY
4154 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4155 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4156 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4157 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4158 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4159#endif
4160 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4161 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 4162 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4163#ifdef CONFIG_IPV6_ROUTER_PREF
4164 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4165 array[DEVCONF_RTR_PROBE_INTERVAL] =
4166 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4167#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4168 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4169#endif
930d6ff2 4170#endif
fbea49e1 4171 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4172 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4173#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4174 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4175#endif
7bc570c8
YH		 4176#ifdef CONFIG_IPV6_MROUTE
4177 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4178#endif
778d80be 4179 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4180 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4181 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4182 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
1da177e4
LT		 4183}
4184
b382b191
TG		 4185static inline size_t inet6_ifla6_size(void)
4186{
4187 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4188 + nla_total_size(sizeof(struct ifla_cacheinfo))
4189 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4190 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4191 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4192 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4193}
4194
339bf98f
TG		 4195static inline size_t inet6_if_nlmsg_size(void)
4196{
4197 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4198 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4199 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4200 + nla_total_size(4) /* IFLA_MTU */
4201 + nla_total_size(4) /* IFLA_LINK */
b382b191 4202 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4203}
c5396a31 4204
be281e55 4205static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4206 int items, int bytes)
7f7d9a6b
HX		 4207{
4208 int i;
4209 int pad = bytes - sizeof(u64) * items;
4210 BUG_ON(pad < 0);
4211
4212 /* Use put_unaligned() because stats may not be aligned for u64. */
4213 put_unaligned(items, &stats[0]);
4214 for (i = 1; i < items; i++)
be281e55 4215 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4216
4217 memset(&stats[items], 0, pad);
4218}
4219
4ce3c183
ED		 4220static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4221 int items, int bytes, size_t syncpoff)
4222{
4223 int i;
4224 int pad = bytes - sizeof(u64) * items;
4225 BUG_ON(pad < 0);
4226
4227 /* Use put_unaligned() because stats may not be aligned for u64. */
4228 put_unaligned(items, &stats[0]);
4229 for (i = 1; i < items; i++)
4230 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4231
4232 memset(&stats[items], 0, pad);
4233}
4234
7f7d9a6b
HX		 4235static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4236 int bytes)
4237{
e21e8467 4238 switch (attrtype) {
7f7d9a6b 4239 case IFLA_INET6_STATS:
4ce3c183
ED		 4240 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4241 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4242 break;
4243 case IFLA_INET6_ICMP6STATS:
be281e55 4244 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4245 break;
4246 }
4247}
4248
b382b191
TG		 4249static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4250{
4251 struct nlattr *nla;
4252 struct ifla_cacheinfo ci;
4253
c78679e8
DM		 4254 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4255 goto nla_put_failure;
b382b191 4256 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4257 ci.tstamp = cstamp_delta(idev->tstamp);
4258 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4259 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
c78679e8
DM		 4260 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4261 goto nla_put_failure;
b382b191
TG		 4262 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4263 if (nla == NULL)
4264 goto nla_put_failure;
4265 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4266
4267 /* XXX - MC not implemented */
4268
4269 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4270 if (nla == NULL)
4271 goto nla_put_failure;
4272 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4273
4274 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4275 if (nla == NULL)
4276 goto nla_put_failure;
4277 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4278
f53adae4
DB		 4279 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4280 if (nla == NULL)
4281 goto nla_put_failure;
4282 read_lock_bh(&idev->lock);
4283 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4284 read_unlock_bh(&idev->lock);
4285
b382b191
TG		 4286 return 0;
4287
4288nla_put_failure:
4289 return -EMSGSIZE;
4290}
4291
4292static size_t inet6_get_link_af_size(const struct net_device *dev)
4293{
4294 if (!__in6_dev_get(dev))
4295 return 0;
4296
4297 return inet6_ifla6_size();
4298}
4299
4300static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4301{
4302 struct inet6_dev *idev = __in6_dev_get(dev);
4303
4304 if (!idev)
4305 return -ENODATA;
4306
4307 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4308 return -EMSGSIZE;
4309
4310 return 0;
4311}
4312
f53adae4
DB		 4313static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4314{
f53adae4
DB		 4315 struct inet6_ifaddr *ifp;
4316 struct net_device *dev = idev->dev;
fc403832 4317 bool update_rs = false;
f53adae4
DB		 4318
4319 if (token == NULL)
4320 return -EINVAL;
4321 if (ipv6_addr_any(token))
4322 return -EINVAL;
4323 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4324 return -EINVAL;
f53adae4
DB		 4325 if (!ipv6_accept_ra(idev))
4326 return -EINVAL;
4327 if (idev->cnf.rtr_solicits <= 0)
4328 return -EINVAL;
4329
4330 write_lock_bh(&idev->lock);
4331
4332 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4333 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4334
4335 write_unlock_bh(&idev->lock);
4336
fc403832
DB		 4337 if (!idev->dead && (idev->if_flags & IF_READY)) {
4338 struct in6_addr ll_addr;
4339
4340 ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4341 IFA_F_OPTIMISTIC);
4342
4343 /* If we're not ready, then normal ifup will take care
4344 * of this. Otherwise, we need to request our rs here.
4345 */
4346 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4347 update_rs = true;
4348 }
f53adae4
DB		 4349
4350 write_lock_bh(&idev->lock);
fc403832
DB		 4351
4352 if (update_rs)
4353 idev->if_flags |= IF_RS_SENT;
f53adae4
DB		 4354
4355 /* Well, that's kinda nasty ... */
4356 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4357 spin_lock(&ifp->lock);
617fe29d 4358 if (ifp->tokenized) {
f53adae4
DB		 4359 ifp->valid_lft = 0;
4360 ifp->prefered_lft = 0;
4361 }
4362 spin_unlock(&ifp->lock);
4363 }
4364
4365 write_unlock_bh(&idev->lock);
4366 return 0;
4367}
4368
4369static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4370{
4371 int err = -EINVAL;
4372 struct inet6_dev *idev = __in6_dev_get(dev);
4373 struct nlattr *tb[IFLA_INET6_MAX + 1];
4374
4375 if (!idev)
4376 return -EAFNOSUPPORT;
4377
4378 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4379 BUG();
4380
4381 if (tb[IFLA_INET6_TOKEN])
4382 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4383
4384 return err;
4385}
4386
1ab1457c 4387static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4388 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4389{
04561c1f 4390 struct net_device *dev = idev->dev;
04561c1f
TG		 4391 struct ifinfomsg *hdr;
4392 struct nlmsghdr *nlh;
4393 void *protoinfo;
04561c1f 4394
15e47304 4395 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
04561c1f 4396 if (nlh == NULL)
26932566 4397 return -EMSGSIZE;
04561c1f
TG		 4398
4399 hdr = nlmsg_data(nlh);
4400 hdr->ifi_family = AF_INET6;
4401 hdr->__ifi_pad = 0;
4402 hdr->ifi_type = dev->type;
4403 hdr->ifi_index = dev->ifindex;
4404 hdr->ifi_flags = dev_get_flags(dev);
4405 hdr->ifi_change = 0;
4406
c78679e8
DM		 4407 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4408 (dev->addr_len &&
4409 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4410 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4411 (dev->ifindex != dev->iflink &&
4412 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4413 goto nla_put_failure;
04561c1f
TG		 4414 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4415 if (protoinfo == NULL)
4416 goto nla_put_failure;
1da177e4 4417
b382b191 4418 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4419 goto nla_put_failure;
1da177e4 4420
04561c1f
TG		 4421 nla_nest_end(skb, protoinfo);
4422 return nlmsg_end(skb, nlh);
1da177e4 4423
04561c1f 4424nla_put_failure:
26932566
PM		 4425 nlmsg_cancel(skb, nlh);
4426 return -EMSGSIZE;
1da177e4
LT		 4427}
4428
4429static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4430{
3b1e0a65 4431 struct net *net = sock_net(skb->sk);
84d2697d 4432 int h, s_h;
434a8a58 4433 int idx = 0, s_idx;
1da177e4
LT		 4434 struct net_device *dev;
4435 struct inet6_dev *idev;
84d2697d 4436 struct hlist_head *head;
1da177e4 4437
84d2697d
ED		 4438 s_h = cb->args[0];
4439 s_idx = cb->args[1];
4440
4441 rcu_read_lock();
4442 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4443 idx = 0;
4444 head = &net->dev_index_head[h];
b67bfe0d 4445 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 4446 if (idx < s_idx)
4447 goto cont;
4448 idev = __in6_dev_get(dev);
4449 if (!idev)
4450 goto cont;
4451 if (inet6_fill_ifinfo(skb, idev,
15e47304 4452 NETLINK_CB(cb->skb).portid,
84d2697d
ED		 4453 cb->nlh->nlmsg_seq,
4454 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4455 goto out;
7562f876 4456cont:
84d2697d
ED		 4457 idx++;
4458 }
1da177e4 4459 }
84d2697d
ED		 4460out:
4461 rcu_read_unlock();
4462 cb->args[1] = idx;
4463 cb->args[0] = h;
1da177e4
LT		 4464
4465 return skb->len;
4466}
4467
4468void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4469{
4470 struct sk_buff *skb;
c346dca1 4471 struct net *net = dev_net(idev->dev);
8d7a76c9 4472 int err = -ENOBUFS;
1ab1457c 4473
339bf98f 4474 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4475 if (skb == NULL)
4476 goto errout;
4477
4478 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4479 if (err < 0) {
4480 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4481 WARN_ON(err == -EMSGSIZE);
4482 kfree_skb(skb);
4483 goto errout;
4484 }
5f75a104 4485 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4486 return;
8d7a76c9
TG		 4487errout:
4488 if (err < 0)
5f75a104 4489 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4490}
4491
339bf98f
TG		 4492static inline size_t inet6_prefix_nlmsg_size(void)
4493{
4494 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4495 + nla_total_size(sizeof(struct in6_addr))
4496 + nla_total_size(sizeof(struct prefix_cacheinfo));
4497}
c5396a31 4498
1da177e4 4499static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4500 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 4501 int event, unsigned int flags)
1da177e4 4502{
6051e2f4
TG		 4503 struct prefixmsg *pmsg;
4504 struct nlmsghdr *nlh;
1da177e4
LT		 4505 struct prefix_cacheinfo ci;
4506
15e47304 4507 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6051e2f4 4508 if (nlh == NULL)
26932566 4509 return -EMSGSIZE;
6051e2f4
TG		 4510
4511 pmsg = nlmsg_data(nlh);
1da177e4 4512 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4513 pmsg->prefix_pad1 = 0;
4514 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4515 pmsg->prefix_ifindex = idev->dev->ifindex;
4516 pmsg->prefix_len = pinfo->prefix_len;
4517 pmsg->prefix_type = pinfo->type;
8a47077a 4518 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4519 pmsg->prefix_flags = 0;
4520 if (pinfo->onlink)
4521 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4522 if (pinfo->autoconf)
4523 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4524
c78679e8
DM		 4525 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4526 goto nla_put_failure;
1da177e4
LT		 4527 ci.preferred_time = ntohl(pinfo->prefered);
4528 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 4529 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4530 goto nla_put_failure;
6051e2f4 4531 return nlmsg_end(skb, nlh);
1da177e4 4532
6051e2f4 4533nla_put_failure:
26932566
PM		 4534 nlmsg_cancel(skb, nlh);
4535 return -EMSGSIZE;
1da177e4
LT		 4536}
4537
1ab1457c 4538static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4539 struct prefix_info *pinfo)
4540{
4541 struct sk_buff *skb;
c346dca1 4542 struct net *net = dev_net(idev->dev);
8c384bfa 4543 int err = -ENOBUFS;
1da177e4 4544
339bf98f 4545 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4546 if (skb == NULL)
4547 goto errout;
4548
4549 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4550 if (err < 0) {
4551 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4552 WARN_ON(err == -EMSGSIZE);
4553 kfree_skb(skb);
4554 goto errout;
4555 }
1ce85fe4
PNA		 4556 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4557 return;
8c384bfa
TG		 4558errout:
4559 if (err < 0)
6fda7350 4560 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4561}
4562
1da177e4
LT		 4563static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4564{
63998ac2
ND		 4565 struct net *net = dev_net(ifp->idev->dev);
4566
1da177e4
LT		 4567 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4568
4569 switch (event) {
4570 case RTM_NEWADDR:
95c385b4
NH		 4571 /*
4572 * If the address was optimistic
4573 * we inserted the route at the start of
4574 * our DAD process, so we don't need
4575 * to do it again
4576 */
4577 if (!(ifp->rt->rt6i_node))
4578 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4579 if (ifp->idev->cnf.forwarding)
4580 addrconf_join_anycast(ifp);
7996c799 4581 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 4582 addrconf_prefix_route(&ifp->peer_addr, 128,
4583 ifp->idev->dev, 0, 0);
1da177e4
LT		 4584 break;
4585 case RTM_DELADDR:
4586 if (ifp->idev->cnf.forwarding)
4587 addrconf_leave_anycast(ifp);
4588 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 4589 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79
ND		 4590 struct rt6_info *rt;
4591 struct net_device *dev = ifp->idev->dev;
4592
4593 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4594 dev->ifindex, 1);
4595 if (rt) {
4596 dst_hold(&rt->dst);
4597 if (ip6_del_rt(rt))
4598 dst_free(&rt->dst);
4599 }
4600 }
d8d1f30b 4601 dst_hold(&ifp->rt->dst);
93fa159a 4602
73a8bd74 4603 if (ip6_del_rt(ifp->rt))
d8d1f30b 4604 dst_free(&ifp->rt->dst);
1da177e4
LT		 4605 break;
4606 }
63998ac2 4607 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 4608}
4609
4610static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4611{
8814c4b5 4612 rcu_read_lock_bh();
1da177e4
LT		 4613 if (likely(ifp->idev->dead == 0))
4614 __ipv6_ifa_notify(event, ifp);
8814c4b5 4615 rcu_read_unlock_bh();
1da177e4
LT		 4616}
4617
4618#ifdef CONFIG_SYSCTL
4619
4620static
fe2c6338 4621int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 4622 void __user *buffer, size_t *lenp, loff_t *ppos)
4623{
4624 int *valp = ctl->data;
4625 int val = *valp;
88af182e 4626 loff_t pos = *ppos;
fe2c6338 4627 struct ctl_table lctl;
1da177e4
LT		 4628 int ret;
4629
013d97e9
FR		 4630 /*
4631 * ctl->data points to idev->cnf.forwarding, we should
4632 * not modify it until we get the rtnl lock.
4633 */
4634 lctl = *ctl;
4635 lctl.data = &val;
4636
4637 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 4638
c8fecf22 4639 if (write)
b325fddb 4640 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4641 if (ret)
4642 *ppos = pos;
1ab1457c 4643 return ret;
1da177e4
LT		 4644}
4645
56d417b1
BH		 4646static void dev_disable_change(struct inet6_dev *idev)
4647{
75538c2b
CW		 4648 struct netdev_notifier_info info;
4649
56d417b1
BH		 4650 if (!idev || !idev->dev)
4651 return;
4652
75538c2b 4653 netdev_notifier_info_init(&info, idev->dev);
56d417b1 4654 if (idev->cnf.disable_ipv6)
75538c2b 4655 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 4656 else
75538c2b 4657 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 4658}
4659
4660static void addrconf_disable_change(struct net *net, __s32 newf)
4661{
4662 struct net_device *dev;
4663 struct inet6_dev *idev;
4664
c6d14c84
ED		 4665 rcu_read_lock();
4666 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4667 idev = __in6_dev_get(dev);
4668 if (idev) {
4669 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4670 idev->cnf.disable_ipv6 = newf;
4671 if (changed)
4672 dev_disable_change(idev);
4673 }
56d417b1 4674 }
c6d14c84 4675 rcu_read_unlock();
56d417b1
BH		 4676}
4677
013d97e9 4678static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 4679{
4680 struct net *net;
013d97e9
FR		 4681 int old;
4682
4683 if (!rtnl_trylock())
4684 return restart_syscall();
56d417b1
BH		 4685
4686 net = (struct net *)table->extra2;
013d97e9
FR		 4687 old = *p;
4688 *p = newf;
56d417b1 4689
013d97e9
FR		 4690 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4691 rtnl_unlock();
56d417b1 4692 return 0;
88af182e 4693 }
56d417b1
BH		 4694
4695 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 4696 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4697 addrconf_disable_change(net, newf);
013d97e9 4698 } else if ((!newf) ^ (!old))
56d417b1
BH		 4699 dev_disable_change((struct inet6_dev *)table->extra1);
4700
4701 rtnl_unlock();
4702 return 0;
4703}
4704
4705static
fe2c6338 4706int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 4707 void __user *buffer, size_t *lenp, loff_t *ppos)
4708{
4709 int *valp = ctl->data;
4710 int val = *valp;
88af182e 4711 loff_t pos = *ppos;
fe2c6338 4712 struct ctl_table lctl;
56d417b1
BH		 4713 int ret;
4714
013d97e9
FR		 4715 /*
4716 * ctl->data points to idev->cnf.disable_ipv6, we should
4717 * not modify it until we get the rtnl lock.
4718 */
4719 lctl = *ctl;
4720 lctl.data = &val;
4721
4722 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 4723
4724 if (write)
4725 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4726 if (ret)
4727 *ppos = pos;
56d417b1
BH		 4728 return ret;
4729}
4730
1da177e4
LT		 4731static struct addrconf_sysctl_table
4732{
4733 struct ctl_table_header *sysctl_header;
fe2c6338 4734 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 4735} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4736 .sysctl_header = NULL,
4737 .addrconf_vars = {
1ab1457c 4738 {
e21e8467
SH		 4739 .procname = "forwarding",
4740 .data = &ipv6_devconf.forwarding,
4741 .maxlen = sizeof(int),
4742 .mode = 0644,
4743 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4744 },
4745 {
e21e8467
SH		 4746 .procname = "hop_limit",
4747 .data = &ipv6_devconf.hop_limit,
4748 .maxlen = sizeof(int),
4749 .mode = 0644,
4750 .proc_handler = proc_dointvec,
1da177e4
LT		 4751 },
4752 {
e21e8467
SH		 4753 .procname = "mtu",
4754 .data = &ipv6_devconf.mtu6,
4755 .maxlen = sizeof(int),
4756 .mode = 0644,
4757 .proc_handler = proc_dointvec,
1da177e4
LT		 4758 },
4759 {
e21e8467
SH		 4760 .procname = "accept_ra",
4761 .data = &ipv6_devconf.accept_ra,
4762 .maxlen = sizeof(int),
4763 .mode = 0644,
4764 .proc_handler = proc_dointvec,
1da177e4
LT		 4765 },
4766 {
e21e8467
SH		 4767 .procname = "accept_redirects",
4768 .data = &ipv6_devconf.accept_redirects,
4769 .maxlen = sizeof(int),
4770 .mode = 0644,
4771 .proc_handler = proc_dointvec,
1da177e4
LT		 4772 },
4773 {
e21e8467
SH		 4774 .procname = "autoconf",
4775 .data = &ipv6_devconf.autoconf,
4776 .maxlen = sizeof(int),
4777 .mode = 0644,
4778 .proc_handler = proc_dointvec,
1da177e4
LT		 4779 },
4780 {
e21e8467
SH		 4781 .procname = "dad_transmits",
4782 .data = &ipv6_devconf.dad_transmits,
4783 .maxlen = sizeof(int),
4784 .mode = 0644,
4785 .proc_handler = proc_dointvec,
1da177e4
LT		 4786 },
4787 {
e21e8467
SH		 4788 .procname = "router_solicitations",
4789 .data = &ipv6_devconf.rtr_solicits,
4790 .maxlen = sizeof(int),
4791 .mode = 0644,
4792 .proc_handler = proc_dointvec,
1da177e4
LT		 4793 },
4794 {
e21e8467
SH		 4795 .procname = "router_solicitation_interval",
4796 .data = &ipv6_devconf.rtr_solicit_interval,
4797 .maxlen = sizeof(int),
4798 .mode = 0644,
4799 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4800 },
4801 {
e21e8467
SH		 4802 .procname = "router_solicitation_delay",
4803 .data = &ipv6_devconf.rtr_solicit_delay,
4804 .maxlen = sizeof(int),
4805 .mode = 0644,
4806 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4807 },
4808 {
e21e8467
SH		 4809 .procname = "force_mld_version",
4810 .data = &ipv6_devconf.force_mld_version,
4811 .maxlen = sizeof(int),
4812 .mode = 0644,
4813 .proc_handler = proc_dointvec,
1da177e4
LT		 4814 },
4815#ifdef CONFIG_IPV6_PRIVACY
4816 {
e21e8467
SH		 4817 .procname = "use_tempaddr",
4818 .data = &ipv6_devconf.use_tempaddr,
4819 .maxlen = sizeof(int),
4820 .mode = 0644,
4821 .proc_handler = proc_dointvec,
1da177e4
LT		 4822 },
4823 {
e21e8467
SH		 4824 .procname = "temp_valid_lft",
4825 .data = &ipv6_devconf.temp_valid_lft,
4826 .maxlen = sizeof(int),
4827 .mode = 0644,
4828 .proc_handler = proc_dointvec,
1da177e4
LT		 4829 },
4830 {
e21e8467
SH		 4831 .procname = "temp_prefered_lft",
4832 .data = &ipv6_devconf.temp_prefered_lft,
4833 .maxlen = sizeof(int),
4834 .mode = 0644,
4835 .proc_handler = proc_dointvec,
1da177e4
LT		 4836 },
4837 {
e21e8467
SH		 4838 .procname = "regen_max_retry",
4839 .data = &ipv6_devconf.regen_max_retry,
4840 .maxlen = sizeof(int),
4841 .mode = 0644,
4842 .proc_handler = proc_dointvec,
1da177e4
LT		 4843 },
4844 {
e21e8467
SH		 4845 .procname = "max_desync_factor",
4846 .data = &ipv6_devconf.max_desync_factor,
4847 .maxlen = sizeof(int),
4848 .mode = 0644,
4849 .proc_handler = proc_dointvec,
1da177e4
LT		 4850 },
4851#endif
4852 {
e21e8467
SH		 4853 .procname = "max_addresses",
4854 .data = &ipv6_devconf.max_addresses,
4855 .maxlen = sizeof(int),
4856 .mode = 0644,
4857 .proc_handler = proc_dointvec,
1da177e4 4858 },
65f5c7c1 4859 {
e21e8467
SH		 4860 .procname = "accept_ra_defrtr",
4861 .data = &ipv6_devconf.accept_ra_defrtr,
4862 .maxlen = sizeof(int),
4863 .mode = 0644,
4864 .proc_handler = proc_dointvec,
65f5c7c1 4865 },
c4fd30eb 4866 {
e21e8467
SH		 4867 .procname = "accept_ra_pinfo",
4868 .data = &ipv6_devconf.accept_ra_pinfo,
4869 .maxlen = sizeof(int),
4870 .mode = 0644,
4871 .proc_handler = proc_dointvec,
c4fd30eb 4872 },
930d6ff2
YH		 4873#ifdef CONFIG_IPV6_ROUTER_PREF
4874 {
e21e8467
SH		 4875 .procname = "accept_ra_rtr_pref",
4876 .data = &ipv6_devconf.accept_ra_rtr_pref,
4877 .maxlen = sizeof(int),
4878 .mode = 0644,
4879 .proc_handler = proc_dointvec,
930d6ff2 4880 },
52e16356 4881 {
e21e8467
SH		 4882 .procname = "router_probe_interval",
4883 .data = &ipv6_devconf.rtr_probe_interval,
4884 .maxlen = sizeof(int),
4885 .mode = 0644,
4886 .proc_handler = proc_dointvec_jiffies,
52e16356 4887 },
fa03ef38 4888#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4889 {
e21e8467
SH		 4890 .procname = "accept_ra_rt_info_max_plen",
4891 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4892 .maxlen = sizeof(int),
4893 .mode = 0644,
4894 .proc_handler = proc_dointvec,
09c884d4
YH		 4895 },
4896#endif
930d6ff2 4897#endif
fbea49e1 4898 {
e21e8467
SH		 4899 .procname = "proxy_ndp",
4900 .data = &ipv6_devconf.proxy_ndp,
4901 .maxlen = sizeof(int),
4902 .mode = 0644,
4903 .proc_handler = proc_dointvec,
fbea49e1 4904 },
0bcbc926 4905 {
e21e8467
SH		 4906 .procname = "accept_source_route",
4907 .data = &ipv6_devconf.accept_source_route,
4908 .maxlen = sizeof(int),
4909 .mode = 0644,
4910 .proc_handler = proc_dointvec,
0bcbc926 4911 },
95c385b4
NH		 4912#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4913 {
e21e8467
SH		 4914 .procname = "optimistic_dad",
4915 .data = &ipv6_devconf.optimistic_dad,
4916 .maxlen = sizeof(int),
4917 .mode = 0644,
4918 .proc_handler = proc_dointvec,
95c385b4
NH		 4919
4920 },
7bc570c8
YH		 4921#endif
4922#ifdef CONFIG_IPV6_MROUTE
4923 {
e21e8467
SH		 4924 .procname = "mc_forwarding",
4925 .data = &ipv6_devconf.mc_forwarding,
4926 .maxlen = sizeof(int),
4927 .mode = 0444,
4928 .proc_handler = proc_dointvec,
7bc570c8 4929 },
95c385b4 4930#endif
778d80be 4931 {
e21e8467
SH		 4932 .procname = "disable_ipv6",
4933 .data = &ipv6_devconf.disable_ipv6,
4934 .maxlen = sizeof(int),
4935 .mode = 0644,
4936 .proc_handler = addrconf_sysctl_disable,
778d80be 4937 },
1b34be74 4938 {
e21e8467
SH		 4939 .procname = "accept_dad",
4940 .data = &ipv6_devconf.accept_dad,
4941 .maxlen = sizeof(int),
4942 .mode = 0644,
4943 .proc_handler = proc_dointvec,
1b34be74 4944 },
f7734fdf 4945 {
f7734fdf
OP		 4946 .procname = "force_tllao",
4947 .data = &ipv6_devconf.force_tllao,
4948 .maxlen = sizeof(int),
4949 .mode = 0644,
4950 .proc_handler = proc_dointvec
4951 },
5cb04436
HFS		 4952 {
4953 .procname = "ndisc_notify",
4954 .data = &ipv6_devconf.ndisc_notify,
4955 .maxlen = sizeof(int),
4956 .mode = 0644,
4957 .proc_handler = proc_dointvec
4958 },
1da177e4 4959 {
f8572d8f 4960 /* sentinel */
1da177e4
LT		 4961 }
4962 },
1da177e4
LT		 4963};
4964
bff16c2f 4965static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4966 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4967{
4968 int i;
1da177e4 4969 struct addrconf_sysctl_table *t;
6105e293 4970 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 4971
af879cc7 4972 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4973 if (t == NULL)
f68635e6
PE		 4974 goto out;
4975
bcdd553f 4976 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 4977 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 4978 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4979 t->addrconf_vars[i].extra2 = net;
1da177e4 4980 }
1da177e4 4981
6105e293 4982 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 4983
6105e293 4984 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
1da177e4 4985 if (t->sysctl_header == NULL)
6105e293 4986 goto free;
f68635e6
PE		 4987
4988 p->sysctl = t;
95897312 4989 return 0;
1da177e4 4990
f68635e6 4991free:
1da177e4 4992 kfree(t);
f68635e6 4993out:
95897312 4994 return -ENOBUFS;
1da177e4
LT		 4995}
4996
408c4768
PE		 4997static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4998{
4999 struct addrconf_sysctl_table *t;
5000
5001 if (p->sysctl == NULL)
5002 return;
5003
5004 t = p->sysctl;
5005 p->sysctl = NULL;
ff538818 5006 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 5007 kfree(t);
5008}
5009
f52295a9
PE		 5010static void addrconf_sysctl_register(struct inet6_dev *idev)
5011{
54716e3b 5012 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 5013 &ndisc_ifinfo_sysctl_change);
c346dca1 5014 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 5015 idev, &idev->cnf);
f52295a9
PE		 5016}
5017
408c4768 5018static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 5019{
408c4768
PE		 5020 __addrconf_sysctl_unregister(&idev->cnf);
5021 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 5022}
5023
5024
5025#endif
5026
2c8c1e72 5027static int __net_init addrconf_init_net(struct net *net)
e0da5a48 5028{
a79ca223 5029 int err = -ENOMEM;
e0da5a48
PE		 5030 struct ipv6_devconf *all, *dflt;
5031
a79ca223
HZ		 5032 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5033 if (all == NULL)
5034 goto err_alloc_all;
e0da5a48 5035
a79ca223
HZ		 5036 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5037 if (dflt == NULL)
5038 goto err_alloc_dflt;
e0da5a48 5039
a79ca223
HZ		 5040 /* these will be inherited by all namespaces */
5041 dflt->autoconf = ipv6_defaults.autoconf;
5042 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 5043
5044 net->ipv6.devconf_all = all;
5045 net->ipv6.devconf_dflt = dflt;
5046
5047#ifdef CONFIG_SYSCTL
f8572d8f 5048 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 5049 if (err < 0)
5050 goto err_reg_all;
5051
f8572d8f 5052 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 5053 if (err < 0)
5054 goto err_reg_dflt;
5055#endif
5056 return 0;
5057
5058#ifdef CONFIG_SYSCTL
5059err_reg_dflt:
5060 __addrconf_sysctl_unregister(all);
5061err_reg_all:
5062 kfree(dflt);
5063#endif
5064err_alloc_dflt:
5065 kfree(all);
5066err_alloc_all:
5067 return err;
5068}
5069
2c8c1e72 5070static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 5071{
5072#ifdef CONFIG_SYSCTL
5073 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5074 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5075#endif
09ad9bc7 5076 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 5077 kfree(net->ipv6.devconf_dflt);
5078 kfree(net->ipv6.devconf_all);
5079 }
5080}
5081
5082static struct pernet_operations addrconf_ops = {
5083 .init = addrconf_init_net,
5084 .exit = addrconf_exit_net,
5085};
5086
b382b191
TG		 5087static struct rtnl_af_ops inet6_ops = {
5088 .family = AF_INET6,
5089 .fill_link_af = inet6_fill_link_af,
5090 .get_link_af_size = inet6_get_link_af_size,
f53adae4 5091 .set_link_af = inet6_set_link_af,
b382b191
TG		 5092};
5093
1da177e4
LT		 5094/*
5095 * Init / cleanup code
5096 */
5097
5098int __init addrconf_init(void)
5099{
c2e21293 5100 int i, err;
2a8cc6c8 5101
e21e8467
SH		 5102 err = ipv6_addr_label_init();
5103 if (err < 0) {
f3213831
JP		 5104 pr_crit("%s: cannot initialize default policy table: %d\n",
5105 __func__, err);
2cc6d2bf 5106 goto out;
2a8cc6c8 5107 }
1da177e4 5108
2cc6d2bf
NH		 5109 err = register_pernet_subsys(&addrconf_ops);
5110 if (err < 0)
5111 goto out_addrlabel;
e0da5a48 5112
1da177e4
LT		 5113 /* The addrconf netdev notifier requires that loopback_dev
5114 * has it's ipv6 private information allocated and setup
5115 * before it can bring up and give link-local addresses
5116 * to other devices which are up.
5117 *
5118 * Unfortunately, loopback_dev is not necessarily the first
5119 * entry in the global dev_base list of net devices. In fact,
5120 * it is likely to be the very last entry on that list.
5121 * So this causes the notifier registry below to try and
5122 * give link-local addresses to all devices besides loopback_dev
5123 * first, then loopback_dev, which cases all the non-loopback_dev
5124 * devices to fail to get a link-local address.
5125 *
5126 * So, as a temporary fix, allocate the ipv6 structure for
5127 * loopback_dev first by hand.
5128 * Longer term, all of the dependencies ipv6 has upon the loopback
5129 * device and it being up should be removed.
5130 */
5131 rtnl_lock();
2774c7ab 5132 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 5133 err = -ENOMEM;
5134 rtnl_unlock();
5135 if (err)
e0da5a48 5136 goto errlo;
1da177e4 5137
c2e21293 5138 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5139 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5140
1da177e4
LT		 5141 register_netdevice_notifier(&ipv6_dev_notf);
5142
1da177e4 5143 addrconf_verify(0);
c127ea2c 5144
b382b191
TG		 5145 err = rtnl_af_register(&inet6_ops);
5146 if (err < 0)
5147 goto errout_af;
5148
c7ac8679
GR		 5149 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5150 NULL);
c127ea2c
TG		 5151 if (err < 0)
5152 goto errout;
5153
5154 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 5155 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5156 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5157 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5158 inet6_dump_ifaddr, NULL);
5159 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5160 inet6_dump_ifmcaddr, NULL);
5161 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5162 inet6_dump_ifacaddr, NULL);
76f8f6cb 5163 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 5164 inet6_netconf_dump_devconf, NULL);
c127ea2c 5165
2a8cc6c8
YH		 5166 ipv6_addr_label_rtnl_register();
5167
1da177e4 5168 return 0;
c127ea2c 5169errout:
b382b191
TG		 5170 rtnl_af_unregister(&inet6_ops);
5171errout_af:
c127ea2c 5172 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 5173errlo:
5174 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 5175out_addrlabel:
5176 ipv6_addr_label_cleanup();
5177out:
c127ea2c 5178 return err;
1da177e4
LT		 5179}
5180
09f7709f 5181void addrconf_cleanup(void)
1da177e4 5182{
176c39af 5183 struct net_device *dev;
1da177e4
LT		 5184 int i;
5185
5186 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5187 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 5188 ipv6_addr_label_cleanup();
1da177e4
LT		 5189
5190 rtnl_lock();
5191
b382b191
TG		 5192 __rtnl_af_unregister(&inet6_ops);
5193
176c39af
DL		 5194 /* clean dev list */
5195 for_each_netdev(&init_net, dev) {
5196 if (__in6_dev_get(dev) == NULL)
5197 continue;
5198 addrconf_ifdown(dev, 1);
5199 }
5200 addrconf_ifdown(init_net.loopback_dev, 2);
5201
1da177e4
LT		 5202 /*
5203 * Check hash table.
5204 */
5c578aed 5205 spin_lock_bh(&addrconf_hash_lock);
c2e21293 5206 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5207 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 5208 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 5209
5210 del_timer(&addr_chk_timer);
1da177e4 5211 rtnl_unlock();
1da177e4 5212}
Linux 6.x block layer and io_uring tree(s)