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macvtap: fix recovery from gup errors
[GitHub/mt8127/android_kernel_alcatel_ttab.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 ?
1da177e4 1129 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 1130 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
1131 addr_flags) : NULL;
3f0d2ba0 1132 if (IS_ERR_OR_NULL(ift)) {
1da177e4
LT		 1133 in6_ifa_put(ifp);
1134 in6_dev_put(idev);
f3213831 1135 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4
LT		 1136 tmpaddr = &addr;
1137 write_lock(&idev->lock);
1138 goto retry;
1139 }
1140
1141 spin_lock_bh(&ift->lock);
1142 ift->ifpub = ifp;
1143 ift->valid_lft = tmp_valid_lft;
1144 ift->prefered_lft = tmp_prefered_lft;
76f793e3 1145 ift->cstamp = now;
1da177e4
LT		 1146 ift->tstamp = tmp_tstamp;
1147 spin_unlock_bh(&ift->lock);
1148
cf22f9a2 1149 addrconf_dad_start(ift);
1da177e4
LT		 1150 in6_ifa_put(ift);
1151 in6_dev_put(idev);
1152out:
1153 return ret;
1154}
1155#endif
1156
1157/*
072047e4 1158 * Choose an appropriate source address (RFC3484)
1da177e4 1159 */
a9b05723
YH		 1160enum {
1161 IPV6_SADDR_RULE_INIT = 0,
1162 IPV6_SADDR_RULE_LOCAL,
1163 IPV6_SADDR_RULE_SCOPE,
1164 IPV6_SADDR_RULE_PREFERRED,
1165#ifdef CONFIG_IPV6_MIP6
1166 IPV6_SADDR_RULE_HOA,
1167#endif
1168 IPV6_SADDR_RULE_OIF,
1169 IPV6_SADDR_RULE_LABEL,
1170#ifdef CONFIG_IPV6_PRIVACY
1171 IPV6_SADDR_RULE_PRIVACY,
1172#endif
1173 IPV6_SADDR_RULE_ORCHID,
1174 IPV6_SADDR_RULE_PREFIX,
1175 IPV6_SADDR_RULE_MAX
1176};
1177
072047e4 1178struct ipv6_saddr_score {
a9b05723
YH		 1179 int rule;
1180 int addr_type;
1181 struct inet6_ifaddr *ifa;
1182 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1183 int scopedist;
1184 int matchlen;
072047e4
YH		 1185};
1186
a9b05723 1187struct ipv6_saddr_dst {
9acd9f3a 1188 const struct in6_addr *addr;
a9b05723
YH		 1189 int ifindex;
1190 int scope;
1191 int label;
7cbca67c 1192 unsigned int prefs;
a9b05723 1193};
072047e4 1194
b6f99a21 1195static inline int ipv6_saddr_preferred(int type)
1da177e4 1196{
45bb0060 1197 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1198 return 1;
1199 return 0;
1da177e4
LT		 1200}
1201
3de23255
BT		 1202static int ipv6_get_saddr_eval(struct net *net,
1203 struct ipv6_saddr_score *score,
a9b05723
YH		 1204 struct ipv6_saddr_dst *dst,
1205 int i)
1206{
1207 int ret;
1208
1209 if (i <= score->rule) {
1210 switch (i) {
1211 case IPV6_SADDR_RULE_SCOPE:
1212 ret = score->scopedist;
1213 break;
1214 case IPV6_SADDR_RULE_PREFIX:
1215 ret = score->matchlen;
1216 break;
1217 default:
1218 ret = !!test_bit(i, score->scorebits);
1219 }
1220 goto out;
1221 }
1222
1223 switch (i) {
1224 case IPV6_SADDR_RULE_INIT:
1225 /* Rule 0: remember if hiscore is not ready yet */
1226 ret = !!score->ifa;
1227 break;
1228 case IPV6_SADDR_RULE_LOCAL:
1229 /* Rule 1: Prefer same address */
1230 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1231 break;
1232 case IPV6_SADDR_RULE_SCOPE:
1233 /* Rule 2: Prefer appropriate scope
1234 *
1235 * ret
1236 * ^
1237 * -1 | d 15
1238 * ---+--+-+---> scope
1239 * |
1240 * | d is scope of the destination.
1241 * B-d | \
1242 * | \ <- smaller scope is better if
1243 * B-15 | \ if scope is enough for destinaion.
1244 * | ret = B - scope (-1 <= scope >= d <= 15).
1245 * d-C-1 | /
1246 * |/ <- greater is better
1247 * -C / if scope is not enough for destination.
1248 * /| ret = scope - C (-1 <= d < scope <= 15).
1249 *
1250 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1251 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1252 * Assume B = 0 and we get C > 29.
1253 */
1254 ret = __ipv6_addr_src_scope(score->addr_type);
1255 if (ret >= dst->scope)
1256 ret = -ret;
1257 else
1258 ret -= 128; /* 30 is enough */
1259 score->scopedist = ret;
1260 break;
1261 case IPV6_SADDR_RULE_PREFERRED:
1262 /* Rule 3: Avoid deprecated and optimistic addresses */
1263 ret = ipv6_saddr_preferred(score->addr_type) ||
1264 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1265 break;
1266#ifdef CONFIG_IPV6_MIP6
1267 case IPV6_SADDR_RULE_HOA:
7cbca67c 1268 {
a9b05723 1269 /* Rule 4: Prefer home address */
7cbca67c
YH		 1270 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1271 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1272 break;
7cbca67c 1273 }
a9b05723
YH		 1274#endif
1275 case IPV6_SADDR_RULE_OIF:
1276 /* Rule 5: Prefer outgoing interface */
1277 ret = (!dst->ifindex ||
1278 dst->ifindex == score->ifa->idev->dev->ifindex);
1279 break;
1280 case IPV6_SADDR_RULE_LABEL:
1281 /* Rule 6: Prefer matching label */
3de23255
BT		 1282 ret = ipv6_addr_label(net,
1283 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1284 score->ifa->idev->dev->ifindex) == dst->label;
1285 break;
1286#ifdef CONFIG_IPV6_PRIVACY
1287 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1288 {
a9b05723 1289 /* Rule 7: Prefer public address
25985edc 1290 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1291 */
7cbca67c
YH		 1292 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1293 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1294 score->ifa->idev->cnf.use_tempaddr >= 2;
1295 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1296 break;
7cbca67c 1297 }
a9b05723
YH		 1298#endif
1299 case IPV6_SADDR_RULE_ORCHID:
1300 /* Rule 8-: Prefer ORCHID vs ORCHID or
1301 * non-ORCHID vs non-ORCHID
1302 */
1303 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1304 ipv6_addr_orchid(dst->addr));
1305 break;
1306 case IPV6_SADDR_RULE_PREFIX:
1307 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1308 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1309 if (ret > score->ifa->prefix_len)
1310 ret = score->ifa->prefix_len;
1311 score->matchlen = ret;
a9b05723
YH		 1312 break;
1313 default:
1314 ret = 0;
1315 }
1316
1317 if (ret)
1318 __set_bit(i, score->scorebits);
1319 score->rule = i;
1320out:
1321 return ret;
1322}
1323
b3f644fc 1324int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1325 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1326 struct in6_addr *saddr)
1da177e4 1327{
a9b05723
YH		 1328 struct ipv6_saddr_score scores[2],
1329 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1330 struct ipv6_saddr_dst dst;
072047e4 1331 struct net_device *dev;
a9b05723 1332 int dst_type;
1da177e4 1333
a9b05723
YH		 1334 dst_type = __ipv6_addr_type(daddr);
1335 dst.addr = daddr;
1336 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1337 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1338 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1339 dst.prefs = prefs;
a9b05723
YH		 1340
1341 hiscore->rule = -1;
1342 hiscore->ifa = NULL;
1da177e4 1343
8814c4b5 1344 rcu_read_lock();
1da177e4 1345
c6d14c84 1346 for_each_netdev_rcu(net, dev) {
072047e4 1347 struct inet6_dev *idev;
072047e4 1348
a9b05723 1349 /* Candidate Source Address (section 4)
072047e4
YH		 1350 * - multicast and link-local destination address,
1351 * the set of candidate source address MUST only
1352 * include addresses assigned to interfaces
1353 * belonging to the same link as the outgoing
1354 * interface.
1355 * (- For site-local destination addresses, the
1356 * set of candidate source addresses MUST only
1357 * include addresses assigned to interfaces
1358 * belonging to the same site as the outgoing
1359 * interface.)
1360 */
a9b05723
YH		 1361 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1362 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1363 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1364 continue;
1da177e4 1365
1da177e4 1366 idev = __in6_dev_get(dev);
072047e4
YH		 1367 if (!idev)
1368 continue;
1369
1370 read_lock_bh(&idev->lock);
502a2ffd 1371 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1372 int i;
072047e4 1373
a9b05723 1374 /*
6b3ae80a
YH		 1375 * - Tentative Address (RFC2462 section 5.4)
1376 * - A tentative address is not considered
1377 * "assigned to an interface" in the traditional
95c385b4 1378 * sense, unless it is also flagged as optimistic.
6b3ae80a 1379 * - Candidate Source Address (section 4)
072047e4
YH		 1380 * - In any case, anycast addresses, multicast
1381 * addresses, and the unspecified address MUST
1382 * NOT be included in a candidate set.
1383 */
a9b05723
YH		 1384 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1385 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1386 continue;
a9b05723
YH		 1387
1388 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1389
1390 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1391 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1392 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1393 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1394 "assigned as unicast address on %s",
1395 dev->name);
1396 continue;
1397 }
1398
a9b05723
YH		 1399 score->rule = -1;
1400 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1401
1402 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1403 int minihiscore, miniscore;
1404
3de23255
BT		 1405 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1406 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1407
1408 if (minihiscore > miniscore) {
1409 if (i == IPV6_SADDR_RULE_SCOPE &&
1410 score->scopedist > 0) {
1411 /*
1412 * special case:
1413 * each remaining entry
1414 * has too small (not enough)
1415 * scope, because ifa entries
1416 * are sorted by their scope
1417 * values.
1418 */
1419 goto try_nextdev;
1420 }
1421 break;
1422 } else if (minihiscore < miniscore) {
a9b05723
YH		 1423 if (hiscore->ifa)
1424 in6_ifa_put(hiscore->ifa);
1425
1426 in6_ifa_hold(score->ifa);
1427
a0bffffc 1428 swap(hiscore, score);
a9b05723
YH		 1429
1430 /* restore our iterator */
1431 score->ifa = hiscore->ifa;
1432
1433 break;
1da177e4 1434 }
072047e4 1435 }
1da177e4 1436 }
a9b05723 1437try_nextdev:
072047e4 1438 read_unlock_bh(&idev->lock);
1da177e4 1439 }
8814c4b5 1440 rcu_read_unlock();
1da177e4 1441
a9b05723 1442 if (!hiscore->ifa)
072047e4 1443 return -EADDRNOTAVAIL;
1ab1457c 1444
4e3fd7a0 1445 *saddr = hiscore->ifa->addr;
a9b05723 1446 in6_ifa_put(hiscore->ifa);
072047e4 1447 return 0;
1da177e4 1448}
5e5f3f0f 1449EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1450
95c385b4
NH		 1451int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1452 unsigned char banned_flags)
1da177e4
LT		 1453{
1454 struct inet6_dev *idev;
1455 int err = -EADDRNOTAVAIL;
1456
8814c4b5 1457 rcu_read_lock();
e21e8467
SH		 1458 idev = __in6_dev_get(dev);
1459 if (idev) {
1da177e4
LT		 1460 struct inet6_ifaddr *ifp;
1461
1462 read_lock_bh(&idev->lock);
502a2ffd 1463 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1464 if (ifp->scope == IFA_LINK &&
1465 !(ifp->flags & banned_flags)) {
4e3fd7a0 1466 *addr = ifp->addr;
1da177e4
LT		 1467 err = 0;
1468 break;
1469 }
1470 }
1471 read_unlock_bh(&idev->lock);
1472 }
8814c4b5 1473 rcu_read_unlock();
1da177e4
LT		 1474 return err;
1475}
1476
1477static int ipv6_count_addresses(struct inet6_dev *idev)
1478{
1479 int cnt = 0;
1480 struct inet6_ifaddr *ifp;
1481
1482 read_lock_bh(&idev->lock);
502a2ffd 1483 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1484 cnt++;
1485 read_unlock_bh(&idev->lock);
1486 return cnt;
1487}
1488
b71d1d42 1489int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1490 const struct net_device *dev, int strict)
1da177e4 1491{
eedf042a 1492 struct inet6_ifaddr *ifp;
ddbe5032 1493 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1494
5c578aed 1495 rcu_read_lock_bh();
b67bfe0d 1496 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1497 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1498 continue;
1da177e4 1499 if (ipv6_addr_equal(&ifp->addr, addr) &&
eedf042a
SH		 1500 !(ifp->flags&IFA_F_TENTATIVE) &&
1501 (dev == NULL || ifp->idev->dev == dev ||
1502 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1503 rcu_read_unlock_bh();
1504 return 1;
1da177e4
LT		 1505 }
1506 }
5c578aed 1507
eedf042a
SH		 1508 rcu_read_unlock_bh();
1509 return 0;
1da177e4 1510}
7159039a
YH		 1511EXPORT_SYMBOL(ipv6_chk_addr);
1512
3e81c6da
DM		 1513static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1514 struct net_device *dev)
1da177e4 1515{
ddbe5032 1516 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1517 struct inet6_ifaddr *ifp;
1da177e4 1518
b67bfe0d 1519 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1520 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1521 continue;
1da177e4
LT		 1522 if (ipv6_addr_equal(&ifp->addr, addr)) {
1523 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1524 return true;
1da177e4
LT		 1525 }
1526 }
3e81c6da 1527 return false;
1da177e4
LT		 1528}
1529
b71d1d42 1530int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1531{
1532 struct inet6_dev *idev;
1533 struct inet6_ifaddr *ifa;
1534 int onlink;
1535
1536 onlink = 0;
1537 rcu_read_lock();
1538 idev = __in6_dev_get(dev);
1539 if (idev) {
1540 read_lock_bh(&idev->lock);
502a2ffd 1541 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1542 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1543 ifa->prefix_len);
1544 if (onlink)
1545 break;
1546 }
1547 read_unlock_bh(&idev->lock);
1548 }
1549 rcu_read_unlock();
1550 return onlink;
1551}
52eeeb84
YH		 1552EXPORT_SYMBOL(ipv6_chk_prefix);
1553
9acd9f3a 1554struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1555 struct net_device *dev, int strict)
1da177e4 1556{
b79d1d54 1557 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1558 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1559
5c578aed 1560 rcu_read_lock_bh();
b67bfe0d 1561 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1562 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1563 continue;
1da177e4
LT		 1564 if (ipv6_addr_equal(&ifp->addr, addr)) {
1565 if (dev == NULL || ifp->idev->dev == dev ||
1566 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1567 result = ifp;
1da177e4
LT		 1568 in6_ifa_hold(ifp);
1569 break;
1570 }
1571 }
1572 }
5c578aed 1573 rcu_read_unlock_bh();
1da177e4 1574
b79d1d54 1575 return result;
1da177e4
LT		 1576}
1577
1da177e4
LT		 1578/* Gets referenced address, destroys ifaddr */
1579
cc411d0b 1580static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1581{
1da177e4
LT		 1582 if (ifp->flags&IFA_F_PERMANENT) {
1583 spin_lock_bh(&ifp->lock);
1584 addrconf_del_timer(ifp);
1585 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1586 if (dad_failed)
1587 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1588 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1589 if (dad_failed)
1590 ipv6_ifa_notify(0, ifp);
1da177e4
LT		 1591 in6_ifa_put(ifp);
1592#ifdef CONFIG_IPV6_PRIVACY
1593 } else if (ifp->flags&IFA_F_TEMPORARY) {
1594 struct inet6_ifaddr *ifpub;
1595 spin_lock_bh(&ifp->lock);
1596 ifpub = ifp->ifpub;
1597 if (ifpub) {
1598 in6_ifa_hold(ifpub);
1599 spin_unlock_bh(&ifp->lock);
1600 ipv6_create_tempaddr(ifpub, ifp);
1601 in6_ifa_put(ifpub);
1602 } else {
1603 spin_unlock_bh(&ifp->lock);
1604 }
1605 ipv6_del_addr(ifp);
1606#endif
1607 } else
1608 ipv6_del_addr(ifp);
1609}
1610
f2344a13
HX		 1611static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1612{
1613 int err = -ENOENT;
1614
1615 spin_lock(&ifp->state_lock);
1616 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1617 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1618 err = 0;
1619 }
1620 spin_unlock(&ifp->state_lock);
1621
1622 return err;
1623}
1624
3c21edbd
YH		 1625void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1626{
1b34be74 1627 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1628
853dc2e0
UB		 1629 if (addrconf_dad_end(ifp)) {
1630 in6_ifa_put(ifp);
f2344a13 1631 return;
853dc2e0 1632 }
f2344a13 1633
e87cc472
JP		 1634 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1635 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1636
1b34be74
YH		 1637 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1638 struct in6_addr addr;
1639
1640 addr.s6_addr32[0] = htonl(0xfe800000);
1641 addr.s6_addr32[1] = 0;
1642
1643 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1644 ipv6_addr_equal(&ifp->addr, &addr)) {
1645 /* DAD failed for link-local based on MAC address */
1646 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1647
f3213831 1648 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1649 ifp->idev->dev->name);
1b34be74
YH		 1650 }
1651 }
1652
cc411d0b 1653 addrconf_dad_stop(ifp, 1);
3c21edbd 1654}
1da177e4
LT		 1655
1656/* Join to solicited addr multicast group. */
1657
b71d1d42 1658void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1659{
1660 struct in6_addr maddr;
1661
1662 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1663 return;
1664
1665 addrconf_addr_solict_mult(addr, &maddr);
1666 ipv6_dev_mc_inc(dev, &maddr);
1667}
1668
b71d1d42 1669void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1670{
1671 struct in6_addr maddr;
1672
1673 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1674 return;
1675
1676 addrconf_addr_solict_mult(addr, &maddr);
1677 __ipv6_dev_mc_dec(idev, &maddr);
1678}
1679
20380731 1680static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1681{
1682 struct in6_addr addr;
2bda8a0c
BM		 1683 if (ifp->prefix_len == 127) /* RFC 6164 */
1684 return;
1da177e4
LT		 1685 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1686 if (ipv6_addr_any(&addr))
1687 return;
1688 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1689}
1690
20380731 1691static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1692{
1693 struct in6_addr addr;
32019e65
YH		 1694 if (ifp->prefix_len == 127) /* RFC 6164 */
1695 return;
1da177e4
LT		 1696 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1697 if (ipv6_addr_any(&addr))
1698 return;
1699 __ipv6_dev_ac_dec(ifp->idev, &addr);
1700}
1701
073a8e0e
YH		 1702static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1703{
1704 if (dev->addr_len != ETH_ALEN)
1705 return -1;
1706 memcpy(eui, dev->dev_addr, 3);
1707 memcpy(eui + 5, dev->dev_addr + 3, 3);
1708
1709 /*
1710 * The zSeries OSA network cards can be shared among various
1711 * OS instances, but the OSA cards have only one MAC address.
1712 * This leads to duplicate address conflicts in conjunction
1713 * with IPv6 if more than one instance uses the same card.
1714 *
1715 * The driver for these cards can deliver a unique 16-bit
1716 * identifier for each instance sharing the same card. It is
1717 * placed instead of 0xFFFE in the interface identifier. The
1718 * "u" bit of the interface identifier is not inverted in this
1719 * case. Hence the resulting interface identifier has local
1720 * scope according to RFC2373.
1721 */
1722 if (dev->dev_id) {
1723 eui[3] = (dev->dev_id >> 8) & 0xFF;
1724 eui[4] = dev->dev_id & 0xFF;
1725 } else {
1726 eui[3] = 0xFF;
1727 eui[4] = 0xFE;
1728 eui[0] ^= 2;
1729 }
1730 return 0;
1731}
1732
06a4c1c5 1733static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1734{
1735 if (dev->addr_len != IEEE802154_ADDR_LEN)
1736 return -1;
1737 memcpy(eui, dev->dev_addr, 8);
5e98a36e 1738 eui[0] ^= 2;
06a4c1c5 1739 return 0;
1740}
1741
cb6bf355
YH		 1742static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1743{
1744 union fwnet_hwaddr *ha;
1745
1746 if (dev->addr_len != FWNET_ALEN)
1747 return -1;
1748
1749 ha = (union fwnet_hwaddr *)dev->dev_addr;
1750
1751 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1752 eui[0] ^= 2;
1753 return 0;
1754}
1755
073a8e0e
YH		 1756static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1757{
1758 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1759 if (dev->addr_len != ARCNET_ALEN)
1760 return -1;
1761 memset(eui, 0, 7);
8e5e8f30 1762 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1763 return 0;
1764}
1765
1766static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1767{
1768 if (dev->addr_len != INFINIBAND_ALEN)
1769 return -1;
1770 memcpy(eui, dev->dev_addr + 12, 8);
1771 eui[0] |= 2;
1772 return 0;
1773}
1774
c61393ea 1775static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1776{
9af28511
SH		 1777 if (addr == 0)
1778 return -1;
dfd982ba
YH		 1779 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1780 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1781 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1782 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1783 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1784 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1785 eui[1] = 0;
1786 eui[2] = 0x5E;
1787 eui[3] = 0xFE;
1788 memcpy(eui + 4, &addr, 4);
1789 return 0;
1790}
dfd982ba
YH		 1791
1792static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1793{
1794 if (dev->priv_flags & IFF_ISATAP)
1795 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1796 return -1;
1797}
1798
aee80b54 1799static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1800{
1801 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1802}
1803
1da177e4
LT		 1804static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1805{
1806 switch (dev->type) {
1807 case ARPHRD_ETHER:
1808 case ARPHRD_FDDI:
073a8e0e 1809 return addrconf_ifid_eui48(eui, dev);
1da177e4 1810 case ARPHRD_ARCNET:
073a8e0e 1811 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1812 case ARPHRD_INFINIBAND:
073a8e0e 1813 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1814 case ARPHRD_SIT:
dfd982ba 1815 return addrconf_ifid_sit(eui, dev);
aee80b54 1816 case ARPHRD_IPGRE:
1817 return addrconf_ifid_gre(eui, dev);
06a4c1c5 1818 case ARPHRD_IEEE802154:
1819 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 1820 case ARPHRD_IEEE1394:
1821 return addrconf_ifid_ieee1394(eui, dev);
1da177e4
LT		 1822 }
1823 return -1;
1824}
1825
1826static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1827{
1828 int err = -1;
1829 struct inet6_ifaddr *ifp;
1830
1831 read_lock_bh(&idev->lock);
502a2ffd 1832 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 1833 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1834 memcpy(eui, ifp->addr.s6_addr+8, 8);
1835 err = 0;
1836 break;
1837 }
1838 }
1839 read_unlock_bh(&idev->lock);
1840 return err;
1841}
1842
1843#ifdef CONFIG_IPV6_PRIVACY
1844/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 1845static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 1846{
1da177e4 1847regen:
955189ef 1848 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1849 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1850
1851 /*
1852 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1853 * check if generated address is not inappropriate
1854 *
1855 * - Reserved subnet anycast (RFC 2526)
1856 * 11111101 11....11 1xxxxxxx
c7dc89c0 1857 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1858 * 00-00-5E-FE-xx-xx-xx-xx
1859 * - value 0
1860 * - XXX: already assigned to an address on the device
1861 */
1ab1457c 1862 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1863 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1864 (idev->rndid[7]&0x80))
1865 goto regen;
1866 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1867 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1868 goto regen;
1869 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1870 goto regen;
1871 }
1da177e4
LT		 1872}
1873
1874static void ipv6_regen_rndid(unsigned long data)
1875{
1876 struct inet6_dev *idev = (struct inet6_dev *) data;
1877 unsigned long expires;
1878
8814c4b5 1879 rcu_read_lock_bh();
1da177e4
LT		 1880 write_lock_bh(&idev->lock);
1881
1882 if (idev->dead)
1883 goto out;
1884
eb7e0575 1885 __ipv6_regen_rndid(idev);
1ab1457c 1886
1da177e4 1887 expires = jiffies +
1ab1457c 1888 idev->cnf.temp_prefered_lft * HZ -
784e2710
BH		 1889 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1890 idev->cnf.max_desync_factor * HZ;
1da177e4 1891 if (time_before(expires, jiffies)) {
f3213831
JP		 1892 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1893 __func__, idev->dev->name);
1da177e4
LT		 1894 goto out;
1895 }
1896
1897 if (!mod_timer(&idev->regen_timer, expires))
1898 in6_dev_hold(idev);
1899
1900out:
1901 write_unlock_bh(&idev->lock);
8814c4b5 1902 rcu_read_unlock_bh();
1da177e4
LT		 1903 in6_dev_put(idev);
1904}
1905
eb7e0575 1906static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 1907{
1da177e4 1908 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 1909 __ipv6_regen_rndid(idev);
1da177e4
LT		 1910}
1911#endif
1912
1913/*
1914 * Add prefix route.
1915 */
1916
1917static void
1918addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1919 unsigned long expires, u32 flags)
1da177e4 1920{
86872cb5
TG		 1921 struct fib6_config cfg = {
1922 .fc_table = RT6_TABLE_PREFIX,
1923 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1924 .fc_ifindex = dev->ifindex,
1925 .fc_expires = expires,
1926 .fc_dst_len = plen,
1927 .fc_flags = RTF_UP | flags,
c346dca1 1928 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1929 .fc_protocol = RTPROT_KERNEL,
86872cb5 1930 };
1da177e4 1931
4e3fd7a0 1932 cfg.fc_dst = *pfx;
1da177e4
LT		 1933
1934 /* Prevent useless cloning on PtP SIT.
1935 This thing is done here expecting that the whole
1936 class of non-broadcast devices need not cloning.
1937 */
07a93626 1938#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 1939 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1940 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1941#endif
1da177e4 1942
86872cb5 1943 ip6_route_add(&cfg);
1da177e4
LT		 1944}
1945
14ef37b6
AH		 1946
1947static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1948 int plen,
1949 const struct net_device *dev,
1950 u32 flags, u32 noflags)
1951{
1952 struct fib6_node *fn;
1953 struct rt6_info *rt = NULL;
1954 struct fib6_table *table;
1955
1956 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1957 if (table == NULL)
1958 return NULL;
1959
5744dd9b 1960 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 1961 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1962 if (!fn)
1963 goto out;
1964 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 1965 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 1966 continue;
1967 if ((rt->rt6i_flags & flags) != flags)
1968 continue;
85da53bf 1969 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 1970 continue;
1971 dst_hold(&rt->dst);
1972 break;
1973 }
1974out:
5744dd9b 1975 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 1976 return rt;
1977}
1978
1979
1da177e4
LT		 1980/* Create "default" multicast route to the interface */
1981
1982static void addrconf_add_mroute(struct net_device *dev)
1983{
86872cb5
TG		 1984 struct fib6_config cfg = {
1985 .fc_table = RT6_TABLE_LOCAL,
1986 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1987 .fc_ifindex = dev->ifindex,
1988 .fc_dst_len = 8,
1989 .fc_flags = RTF_UP,
c346dca1 1990 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1991 };
1992
1993 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1994
1995 ip6_route_add(&cfg);
1da177e4
LT		 1996}
1997
07a93626 1998#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 1999static void sit_route_add(struct net_device *dev)
2000{
86872cb5
TG		 2001 struct fib6_config cfg = {
2002 .fc_table = RT6_TABLE_MAIN,
2003 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2004 .fc_ifindex = dev->ifindex,
2005 .fc_dst_len = 96,
2006 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 2007 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 2008 };
1da177e4
LT		 2009
2010 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 2011 ip6_route_add(&cfg);
1da177e4 2012}
0be669bb 2013#endif
1da177e4 2014
1da177e4
LT		 2015static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2016{
2017 struct inet6_dev *idev;
2018
2019 ASSERT_RTNL();
2020
e21e8467
SH		 2021 idev = ipv6_find_idev(dev);
2022 if (!idev)
64e724f6
BH		 2023 return ERR_PTR(-ENOBUFS);
2024
2025 if (idev->cnf.disable_ipv6)
2026 return ERR_PTR(-EACCES);
1da177e4
LT		 2027
2028 /* Add default multicast route */
4af04aba
LW		 2029 if (!(dev->flags & IFF_LOOPBACK))
2030 addrconf_add_mroute(dev);
1da177e4 2031
1da177e4
LT		 2032 return idev;
2033}
2034
e6bff995 2035void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2036{
2037 struct prefix_info *pinfo;
2038 __u32 valid_lft;
2039 __u32 prefered_lft;
2040 int addr_type;
1da177e4 2041 struct inet6_dev *in6_dev;
56d417b1 2042 struct net *net = dev_net(dev);
1da177e4
LT		 2043
2044 pinfo = (struct prefix_info *) opt;
1ab1457c 2045
1da177e4
LT		 2046 if (len < sizeof(struct prefix_info)) {
2047 ADBG(("addrconf: prefix option too short\n"));
2048 return;
2049 }
1ab1457c 2050
1da177e4
LT		 2051 /*
2052 * Validation checks ([ADDRCONF], page 19)
2053 */
2054
2055 addr_type = ipv6_addr_type(&pinfo->prefix);
2056
2057 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2058 return;
2059
2060 valid_lft = ntohl(pinfo->valid);
2061 prefered_lft = ntohl(pinfo->prefered);
2062
2063 if (prefered_lft > valid_lft) {
e87cc472 2064 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2065 return;
2066 }
2067
2068 in6_dev = in6_dev_get(dev);
2069
2070 if (in6_dev == NULL) {
e87cc472
JP		 2071 net_dbg_ratelimited("addrconf: device %s not configured\n",
2072 dev->name);
1da177e4
LT		 2073 return;
2074 }
2075
2076 /*
2077 * Two things going on here:
2078 * 1) Add routes for on-link prefixes
2079 * 2) Configure prefixes with the auto flag set
2080 */
2081
4bed72e4
YH		 2082 if (pinfo->onlink) {
2083 struct rt6_info *rt;
2084 unsigned long rt_expires;
2085
6f704992
YH		 2086 /* Avoid arithmetic overflow. Really, we could
2087 * save rt_expires in seconds, likely valid_lft,
2088 * but it would require division in fib gc, that it
2089 * not good.
2090 */
4bed72e4
YH		 2091 if (HZ > USER_HZ)
2092 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2093 else
2094 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2095
4bed72e4
YH		 2096 if (addrconf_finite_timeout(rt_expires))
2097 rt_expires *= HZ;
1da177e4 2098
14ef37b6
AH		 2099 rt = addrconf_get_prefix_route(&pinfo->prefix,
2100 pinfo->prefix_len,
2101 dev,
2102 RTF_ADDRCONF | RTF_PREFIX_RT,
2103 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2104
14ef37b6 2105 if (rt) {
6f704992
YH		 2106 /* Autoconf prefix route */
2107 if (valid_lft == 0) {
2108 ip6_del_rt(rt);
2109 rt = NULL;
4bed72e4 2110 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2111 /* not infinity */
1716a961 2112 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2113 } else {
1716a961 2114 rt6_clean_expires(rt);
1da177e4
LT		 2115 }
2116 } else if (valid_lft) {
6f704992 2117 clock_t expires = 0;
4bed72e4
YH		 2118 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2119 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2120 /* not infinity */
2121 flags |= RTF_EXPIRES;
2122 expires = jiffies_to_clock_t(rt_expires);
2123 }
1da177e4 2124 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2125 dev, expires, flags);
1da177e4 2126 }
94e187c0 2127 ip6_rt_put(rt);
1da177e4
LT		 2128 }
2129
2130 /* Try to figure out our local address for this prefix */
2131
2132 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2133 struct inet6_ifaddr *ifp;
1da177e4
LT		 2134 struct in6_addr addr;
2135 int create = 0, update_lft = 0;
617fe29d 2136 bool tokenized = false;
1da177e4
LT		 2137
2138 if (pinfo->prefix_len == 64) {
2139 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2140
2141 if (!ipv6_addr_any(&in6_dev->token)) {
2142 read_lock_bh(&in6_dev->lock);
2143 memcpy(addr.s6_addr + 8,
2144 in6_dev->token.s6_addr + 8, 8);
2145 read_unlock_bh(&in6_dev->lock);
617fe29d 2146 tokenized = true;
f53adae4
DB		 2147 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2148 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1da177e4
LT		 2149 in6_dev_put(in6_dev);
2150 return;
2151 }
2152 goto ok;
2153 }
e87cc472
JP		 2154 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2155 pinfo->prefix_len);
1da177e4
LT		 2156 in6_dev_put(in6_dev);
2157 return;
2158
2159ok:
2160
53b7997f 2161 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 2162
2163 if (ifp == NULL && valid_lft) {
2164 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2165 u32 addr_flags = 0;
2166
2167#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2168 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2169 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 2170 addr_flags = IFA_F_OPTIMISTIC;
2171#endif
1da177e4
LT		 2172
2173 /* Do not allow to create too much of autoconfigured
2174 * addresses; this would be too easy way to crash kernel.
2175 */
2176 if (!max_addresses ||
2177 ipv6_count_addresses(in6_dev) < max_addresses)
2178 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 2179 addr_type&IPV6_ADDR_SCOPE_MASK,
2180 addr_flags);
1da177e4 2181
3f0d2ba0 2182 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2183 in6_dev_put(in6_dev);
2184 return;
2185 }
2186
2187 update_lft = create = 1;
2188 ifp->cstamp = jiffies;
617fe29d 2189 ifp->tokenized = tokenized;
cf22f9a2 2190 addrconf_dad_start(ifp);
1da177e4
LT		 2191 }
2192
2193 if (ifp) {
2194 int flags;
2195 unsigned long now;
2196#ifdef CONFIG_IPV6_PRIVACY
2197 struct inet6_ifaddr *ift;
2198#endif
2199 u32 stored_lft;
2200
2201 /* update lifetime (RFC2462 5.5.3 e) */
2202 spin_lock(&ifp->lock);
2203 now = jiffies;
2204 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2205 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2206 else
2207 stored_lft = 0;
2208 if (!update_lft && stored_lft) {
2209 if (valid_lft > MIN_VALID_LIFETIME ||
2210 valid_lft > stored_lft)
2211 update_lft = 1;
2212 else if (stored_lft <= MIN_VALID_LIFETIME) {
2213 /* valid_lft <= stored_lft is always true */
a1ed0526
BH		 2214 /*
2215 * RFC 4862 Section 5.5.3e:
2216 * "Note that the preferred lifetime of
2217 * the corresponding address is always
2218 * reset to the Preferred Lifetime in
2219 * the received Prefix Information
2220 * option, regardless of whether the
2221 * valid lifetime is also reset or
2222 * ignored."
2223 *
2224 * So if the preferred lifetime in
2225 * this advertisement is different
2226 * than what we have stored, but the
2227 * valid lifetime is invalid, just
2228 * reset prefered_lft.
2229 *
2230 * We must set the valid lifetime
2231 * to the stored lifetime since we'll
2232 * be updating the timestamp below,
2233 * else we'll set it back to the
25985edc 2234 * minimum.
a1ed0526
BH		 2235 */
2236 if (prefered_lft != ifp->prefered_lft) {
2237 valid_lft = stored_lft;
2238 update_lft = 1;
2239 }
1da177e4
LT		 2240 } else {
2241 valid_lft = MIN_VALID_LIFETIME;
2242 if (valid_lft < prefered_lft)
2243 prefered_lft = valid_lft;
2244 update_lft = 1;
2245 }
2246 }
2247
2248 if (update_lft) {
2249 ifp->valid_lft = valid_lft;
2250 ifp->prefered_lft = prefered_lft;
2251 ifp->tstamp = now;
2252 flags = ifp->flags;
2253 ifp->flags &= ~IFA_F_DEPRECATED;
2254 spin_unlock(&ifp->lock);
2255
2256 if (!(flags&IFA_F_TENTATIVE))
2257 ipv6_ifa_notify(0, ifp);
2258 } else
2259 spin_unlock(&ifp->lock);
2260
2261#ifdef CONFIG_IPV6_PRIVACY
2262 read_lock_bh(&in6_dev->lock);
2263 /* update all temporary addresses in the list */
76f793e3
LC		 2264 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2265 tmp_list) {
2266 int age, max_valid, max_prefered;
2267
c6fbfac2
BB		 2268 if (ifp != ift->ifpub)
2269 continue;
2270
76f793e3
LC		 2271 /*
2272 * RFC 4941 section 3.3:
2273 * If a received option will extend the lifetime
2274 * of a public address, the lifetimes of
2275 * temporary addresses should be extended,
2276 * subject to the overall constraint that no
2277 * temporary addresses should ever remain
2278 * "valid" or "preferred" for a time longer than
2279 * (TEMP_VALID_LIFETIME) or
2280 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2281 * respectively.
2282 */
2283 age = (now - ift->cstamp) / HZ;
2284 max_valid = in6_dev->cnf.temp_valid_lft - age;
2285 if (max_valid < 0)
2286 max_valid = 0;
2287
2288 max_prefered = in6_dev->cnf.temp_prefered_lft -
2289 in6_dev->cnf.max_desync_factor -
2290 age;
2291 if (max_prefered < 0)
2292 max_prefered = 0;
2293
2294 if (valid_lft > max_valid)
2295 valid_lft = max_valid;
2296
2297 if (prefered_lft > max_prefered)
2298 prefered_lft = max_prefered;
2299
1da177e4
LT		 2300 spin_lock(&ift->lock);
2301 flags = ift->flags;
76f793e3
LC		 2302 ift->valid_lft = valid_lft;
2303 ift->prefered_lft = prefered_lft;
2304 ift->tstamp = now;
2305 if (prefered_lft > 0)
2306 ift->flags &= ~IFA_F_DEPRECATED;
2307
1da177e4
LT		 2308 spin_unlock(&ift->lock);
2309 if (!(flags&IFA_F_TENTATIVE))
2310 ipv6_ifa_notify(0, ift);
2311 }
2312
aed65501 2313 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
1da177e4 2314 /*
76f793e3
LC		 2315 * When a new public address is created as
2316 * described in [ADDRCONF], also create a new
2317 * temporary address. Also create a temporary
2318 * address if it's enabled but no temporary
2319 * address currently exists.
1da177e4 2320 */
1ab1457c 2321 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 2322 ipv6_create_tempaddr(ifp, NULL);
2323 } else {
2324 read_unlock_bh(&in6_dev->lock);
2325 }
2326#endif
2327 in6_ifa_put(ifp);
2328 addrconf_verify(0);
2329 }
2330 }
2331 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2332 in6_dev_put(in6_dev);
2333}
2334
2335/*
2336 * Set destination address.
2337 * Special case for SIT interfaces where we create a new "virtual"
2338 * device.
2339 */
af284937 2340int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2341{
2342 struct in6_ifreq ireq;
2343 struct net_device *dev;
2344 int err = -EINVAL;
2345
2346 rtnl_lock();
2347
2348 err = -EFAULT;
2349 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2350 goto err_exit;
2351
af284937 2352 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2353
2354 err = -ENODEV;
2355 if (dev == NULL)
2356 goto err_exit;
2357
07a93626 2358#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2359 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2360 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2361 struct ifreq ifr;
1da177e4
LT		 2362 struct ip_tunnel_parm p;
2363
2364 err = -EADDRNOTAVAIL;
2365 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2366 goto err_exit;
2367
2368 memset(&p, 0, sizeof(p));
2369 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2370 p.iph.saddr = 0;
2371 p.iph.version = 4;
2372 p.iph.ihl = 5;
2373 p.iph.protocol = IPPROTO_IPV6;
2374 p.iph.ttl = 64;
d20b3109 2375 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2376
5bc3eb7e
SH		 2377 if (ops->ndo_do_ioctl) {
2378 mm_segment_t oldfs = get_fs();
2379
2380 set_fs(KERNEL_DS);
2381 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2382 set_fs(oldfs);
2383 } else
2384 err = -EOPNOTSUPP;
1da177e4
LT		 2385
2386 if (err == 0) {
2387 err = -ENOBUFS;
af284937
DL		 2388 dev = __dev_get_by_name(net, p.name);
2389 if (!dev)
1da177e4
LT		 2390 goto err_exit;
2391 err = dev_open(dev);
2392 }
2393 }
0be669bb 2394#endif
1da177e4
LT		 2395
2396err_exit:
2397 rtnl_unlock();
2398 return err;
2399}
2400
2401/*
2402 * Manual configuration of address on an interface
2403 */
b71d1d42 2404static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *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;
06aebfb7 2460 spin_unlock_bh(&ifp->lock);
0778769d 2461
46d48046 2462 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2463 expires, flags);
95c385b4
NH		 2464 /*
2465 * Note that section 3.1 of RFC 4429 indicates
2466 * that the Optimistic flag should not be set for
2467 * manually configured addresses
2468 */
cf22f9a2 2469 addrconf_dad_start(ifp);
1da177e4 2470 in6_ifa_put(ifp);
0778769d 2471 addrconf_verify(0);
1da177e4
LT		 2472 return 0;
2473 }
2474
2475 return PTR_ERR(ifp);
2476}
2477
b71d1d42 2478static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2479 unsigned int plen)
1da177e4
LT		 2480{
2481 struct inet6_ifaddr *ifp;
2482 struct inet6_dev *idev;
2483 struct net_device *dev;
1ab1457c 2484
24ef0da7
TG		 2485 if (plen > 128)
2486 return -EINVAL;
2487
af284937
DL		 2488 dev = __dev_get_by_index(net, ifindex);
2489 if (!dev)
1da177e4
LT		 2490 return -ENODEV;
2491
2492 if ((idev = __in6_dev_get(dev)) == NULL)
2493 return -ENXIO;
2494
2495 read_lock_bh(&idev->lock);
502a2ffd 2496 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2497 if (ifp->prefix_len == plen &&
2498 ipv6_addr_equal(pfx, &ifp->addr)) {
2499 in6_ifa_hold(ifp);
2500 read_unlock_bh(&idev->lock);
1ab1457c 2501
1da177e4
LT		 2502 ipv6_del_addr(ifp);
2503
2504 /* If the last address is deleted administratively,
2505 disable IPv6 on this interface.
2506 */
502a2ffd 2507 if (list_empty(&idev->addr_list))
1da177e4
LT		 2508 addrconf_ifdown(idev->dev, 1);
2509 return 0;
2510 }
2511 }
2512 read_unlock_bh(&idev->lock);
2513 return -EADDRNOTAVAIL;
2514}
2515
2516
af284937 2517int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2518{
2519 struct in6_ifreq ireq;
2520 int err;
1ab1457c 2521
af31f412 2522 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2523 return -EPERM;
1ab1457c 2524
1da177e4
LT		 2525 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2526 return -EFAULT;
2527
2528 rtnl_lock();
af284937
DL		 2529 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2530 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2531 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2532 rtnl_unlock();
2533 return err;
2534}
2535
af284937 2536int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2537{
2538 struct in6_ifreq ireq;
2539 int err;
1ab1457c 2540
af31f412 2541 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2542 return -EPERM;
2543
2544 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2545 return -EFAULT;
2546
2547 rtnl_lock();
af284937
DL		 2548 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2549 ireq.ifr6_prefixlen);
1da177e4
LT		 2550 rtnl_unlock();
2551 return err;
2552}
2553
b5f348e5
IJ		 2554static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2555 int plen, int scope)
2556{
2557 struct inet6_ifaddr *ifp;
2558
2559 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2560 if (!IS_ERR(ifp)) {
2561 spin_lock_bh(&ifp->lock);
2562 ifp->flags &= ~IFA_F_TENTATIVE;
2563 spin_unlock_bh(&ifp->lock);
2564 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2565 in6_ifa_put(ifp);
2566 }
2567}
2568
07a93626 2569#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2570static void sit_add_v4_addrs(struct inet6_dev *idev)
2571{
1da177e4
LT		 2572 struct in6_addr addr;
2573 struct net_device *dev;
c346dca1 2574 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2575 int scope;
2576
2577 ASSERT_RTNL();
2578
2579 memset(&addr, 0, sizeof(struct in6_addr));
2580 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2581
2582 if (idev->dev->flags&IFF_POINTOPOINT) {
2583 addr.s6_addr32[0] = htonl(0xfe800000);
2584 scope = IFA_LINK;
2585 } else {
2586 scope = IPV6_ADDR_COMPATv4;
2587 }
2588
2589 if (addr.s6_addr32[3]) {
b5f348e5 2590 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2591 return;
2592 }
2593
6fda7350 2594 for_each_netdev(net, dev) {
8e5e8f30 2595 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2596 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2597 struct in_ifaddr *ifa;
1da177e4
LT		 2598
2599 int flag = scope;
2600
2601 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2602 int plen;
2603
2604 addr.s6_addr32[3] = ifa->ifa_local;
2605
2606 if (ifa->ifa_scope == RT_SCOPE_LINK)
2607 continue;
2608 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2609 if (idev->dev->flags&IFF_POINTOPOINT)
2610 continue;
2611 flag |= IFA_HOST;
2612 }
2613 if (idev->dev->flags&IFF_POINTOPOINT)
2614 plen = 64;
2615 else
2616 plen = 96;
2617
b5f348e5 2618 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2619 }
2620 }
1ab1457c 2621 }
1da177e4 2622}
0be669bb 2623#endif
1da177e4
LT		 2624
2625static void init_loopback(struct net_device *dev)
2626{
2627 struct inet6_dev *idev;
25fb6ca4
BK		 2628 struct net_device *sp_dev;
2629 struct inet6_ifaddr *sp_ifa;
2630 struct rt6_info *sp_rt;
1da177e4
LT		 2631
2632 /* ::1 */
2633
2634 ASSERT_RTNL();
2635
2636 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2637 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2638 return;
2639 }
2640
b5f348e5 2641 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2642
2643 /* Add routes to other interface's IPv6 addresses */
2644 for_each_netdev(dev_net(dev), sp_dev) {
2645 if (!strcmp(sp_dev->name, dev->name))
2646 continue;
2647
2648 idev = __in6_dev_get(sp_dev);
2649 if (!idev)
2650 continue;
2651
2652 read_lock_bh(&idev->lock);
2653 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2654
2655 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2656 continue;
2657
a881ae1f
G		 2658 if (sp_ifa->rt)
2659 continue;
2660
25fb6ca4
BK		 2661 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
2662
2663 /* Failure cases are ignored */
534c8779
G		 2664 if (!IS_ERR(sp_rt)) {
2665 sp_ifa->rt = sp_rt;
25fb6ca4 2666 ip6_ins_rt(sp_rt);
534c8779 2667 }
25fb6ca4
BK		 2668 }
2669 read_unlock_bh(&idev->lock);
2670 }
1da177e4
LT		 2671}
2672
b71d1d42 2673static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4 2674{
8e5e8f30 2675 struct inet6_ifaddr *ifp;
95c385b4
NH		 2676 u32 addr_flags = IFA_F_PERMANENT;
2677
2678#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2679 if (idev->cnf.optimistic_dad &&
702beb87 2680 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2681 addr_flags |= IFA_F_OPTIMISTIC;
2682#endif
1da177e4 2683
95c385b4
NH		 2684
2685 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2686 if (!IS_ERR(ifp)) {
46d48046 2687 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2688 addrconf_dad_start(ifp);
1da177e4
LT		 2689 in6_ifa_put(ifp);
2690 }
2691}
2692
2693static void addrconf_dev_config(struct net_device *dev)
2694{
2695 struct in6_addr addr;
8e5e8f30 2696 struct inet6_dev *idev;
1da177e4
LT		 2697
2698 ASSERT_RTNL();
2699
74235a25
HX		 2700 if ((dev->type != ARPHRD_ETHER) &&
2701 (dev->type != ARPHRD_FDDI) &&
74235a25 2702 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 2703 (dev->type != ARPHRD_INFINIBAND) &&
cb6bf355
YH		 2704 (dev->type != ARPHRD_IEEE802154) &&
2705 (dev->type != ARPHRD_IEEE1394)) {
74235a25
HX		 2706 /* Alas, we support only Ethernet autoconfiguration. */
2707 return;
2708 }
2709
1da177e4 2710 idev = addrconf_add_dev(dev);
64e724f6 2711 if (IS_ERR(idev))
1da177e4
LT		 2712 return;
2713
2714 memset(&addr, 0, sizeof(struct in6_addr));
2715 addr.s6_addr32[0] = htonl(0xFE800000);
2716
2717 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2718 addrconf_add_linklocal(idev, &addr);
2719}
2720
07a93626 2721#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2722static void addrconf_sit_config(struct net_device *dev)
2723{
2724 struct inet6_dev *idev;
2725
2726 ASSERT_RTNL();
2727
1ab1457c
YH		 2728 /*
2729 * Configure the tunnel with one of our IPv4
2730 * addresses... we should configure all of
1da177e4
LT		 2731 * our v4 addrs in the tunnel
2732 */
2733
2734 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2735 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2736 return;
2737 }
2738
c7dc89c0
FT		 2739 if (dev->priv_flags & IFF_ISATAP) {
2740 struct in6_addr addr;
2741
2742 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2743 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2744 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2745 addrconf_add_linklocal(idev, &addr);
2746 return;
2747 }
2748
1da177e4
LT		 2749 sit_add_v4_addrs(idev);
2750
62b54dd9 2751 if (dev->flags&IFF_POINTOPOINT)
1da177e4 2752 addrconf_add_mroute(dev);
62b54dd9 2753 else
1da177e4
LT		 2754 sit_route_add(dev);
2755}
0be669bb 2756#endif
1da177e4 2757
07a93626 2758#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2759static void addrconf_gre_config(struct net_device *dev)
2760{
2761 struct inet6_dev *idev;
2762 struct in6_addr addr;
2763
f3213831 2764 pr_info("%s(%s)\n", __func__, dev->name);
aee80b54 2765
2766 ASSERT_RTNL();
2767
2768 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2769 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 2770 return;
2771 }
2772
2773 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2774 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2775
2776 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2777 addrconf_add_linklocal(idev, &addr);
2778}
2779#endif
2780
1da177e4
LT		 2781static inline int
2782ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2783{
2784 struct in6_addr lladdr;
2785
95c385b4 2786 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2787 addrconf_add_linklocal(idev, &lladdr);
2788 return 0;
2789 }
2790 return -1;
2791}
2792
2793static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2794{
2795 struct net_device *link_dev;
c346dca1 2796 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2797
2798 /* first try to inherit the link-local address from the link device */
2799 if (idev->dev->iflink &&
6fda7350 2800 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2801 if (!ipv6_inherit_linklocal(idev, link_dev))
2802 return;
2803 }
2804 /* then try to inherit it from any device */
6fda7350 2805 for_each_netdev(net, link_dev) {
1da177e4
LT		 2806 if (!ipv6_inherit_linklocal(idev, link_dev))
2807 return;
2808 }
91df42be 2809 pr_debug("init ip6-ip6: add_linklocal failed\n");
1da177e4
LT		 2810}
2811
2812/*
2813 * Autoconfigure tunnel with a link-local address so routing protocols,
2814 * DHCPv6, MLD etc. can be run over the virtual link
2815 */
2816
2817static void addrconf_ip6_tnl_config(struct net_device *dev)
2818{
2819 struct inet6_dev *idev;
2820
2821 ASSERT_RTNL();
2822
e21e8467 2823 idev = addrconf_add_dev(dev);
64e724f6 2824 if (IS_ERR(idev)) {
91df42be 2825 pr_debug("init ip6-ip6: add_dev failed\n");
1da177e4
LT		 2826 return;
2827 }
2828 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2829}
2830
1ab1457c 2831static int addrconf_notify(struct notifier_block *this, unsigned long event,
8e5e8f30 2832 void *data)
1da177e4
LT		 2833{
2834 struct net_device *dev = (struct net_device *) data;
748e2d93 2835 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2836 int run_pending = 0;
b217d616 2837 int err;
1da177e4 2838
e21e8467 2839 switch (event) {
45ba9dd2 2840 case NETDEV_REGISTER:
74235a25 2841 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2842 idev = ipv6_add_dev(dev);
2843 if (!idev)
b217d616 2844 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2845 }
2846 break;
bcdd553f 2847
1da177e4 2848 case NETDEV_UP:
3c21edbd 2849 case NETDEV_CHANGE:
c2edacf8
JV		 2850 if (dev->flags & IFF_SLAVE)
2851 break;
2852
3c21edbd 2853 if (event == NETDEV_UP) {
f24e3d65 2854 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 2855 /* device is not ready yet. */
f3213831 2856 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 2857 dev->name);
2858 break;
2859 }
99081049 2860
d31c7b8f
EP		 2861 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2862 idev = ipv6_add_dev(dev);
2863
e3ec6cfc 2864 if (idev) {
99081049 2865 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2866 run_pending = 1;
2867 }
3c21edbd 2868 } else {
f24e3d65 2869 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2870 /* device is still not ready. */
2871 break;
2872 }
2873
2874 if (idev) {
bcdd553f 2875 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2876 /* device is already configured. */
2877 break;
3c21edbd
YH		 2878 idev->if_flags |= IF_READY;
2879 }
2880
f3213831
JP		 2881 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2882 dev->name);
3c21edbd 2883
c5e33bdd 2884 run_pending = 1;
3c21edbd
YH		 2885 }
2886
e21e8467 2887 switch (dev->type) {
07a93626 2888#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2889 case ARPHRD_SIT:
2890 addrconf_sit_config(dev);
2891 break;
aee80b54 2892#endif
07a93626 2893#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2894 case ARPHRD_IPGRE:
2895 addrconf_gre_config(dev);
2896 break;
0be669bb 2897#endif
1da177e4
LT		 2898 case ARPHRD_TUNNEL6:
2899 addrconf_ip6_tnl_config(dev);
2900 break;
2901 case ARPHRD_LOOPBACK:
2902 init_loopback(dev);
2903 break;
2904
2905 default:
2906 addrconf_dev_config(dev);
2907 break;
3ff50b79 2908 }
bcdd553f 2909
1da177e4 2910 if (idev) {
c5e33bdd
YH		 2911 if (run_pending)
2912 addrconf_dad_run(idev);
2913
bcdd553f
SH		 2914 /*
2915 * If the MTU changed during the interface down,
2916 * when the interface up, the changed MTU must be
2917 * reflected in the idev as well as routers.
1da177e4 2918 */
bcdd553f
SH		 2919 if (idev->cnf.mtu6 != dev->mtu &&
2920 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2921 rt6_mtu_change(dev, dev->mtu);
2922 idev->cnf.mtu6 = dev->mtu;
2923 }
2924 idev->tstamp = jiffies;
2925 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2926
2927 /*
2928 * If the changed mtu during down is lower than
2929 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2930 */
2931 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2932 addrconf_ifdown(dev, 1);
1da177e4
LT		 2933 }
2934 break;
2935
2936 case NETDEV_CHANGEMTU:
d31c7b8f 2937 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2938 rt6_mtu_change(dev, dev->mtu);
2939 idev->cnf.mtu6 = dev->mtu;
2940 break;
2941 }
2942
d31c7b8f
EP		 2943 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2944 idev = ipv6_add_dev(dev);
2945 if (idev)
2946 break;
2947 }
2948
bcdd553f
SH		 2949 /*
2950 * MTU falled under IPV6_MIN_MTU.
2951 * Stop IPv6 on this interface.
2952 */
1da177e4
LT		 2953
2954 case NETDEV_DOWN:
2955 case NETDEV_UNREGISTER:
2956 /*
2957 * Remove all addresses from this interface.
2958 */
2959 addrconf_ifdown(dev, event != NETDEV_DOWN);
2960 break;
3c21edbd 2961
1da177e4 2962 case NETDEV_CHANGENAME:
1da177e4 2963 if (idev) {
5632c515 2964 snmp6_unregister_dev(idev);
408c4768 2965 addrconf_sysctl_unregister(idev);
f52295a9 2966 addrconf_sysctl_register(idev);
b217d616
HX		 2967 err = snmp6_register_dev(idev);
2968 if (err)
2969 return notifier_from_errno(err);
5632c515 2970 }
1da177e4 2971 break;
bcdd553f 2972
93d9b7d7
JP		 2973 case NETDEV_PRE_TYPE_CHANGE:
2974 case NETDEV_POST_TYPE_CHANGE:
2975 addrconf_type_change(dev, event);
75c78500 2976 break;
3ff50b79 2977 }
1da177e4
LT		 2978
2979 return NOTIFY_OK;
2980}
2981
2982/*
2983 * addrconf module should be notified of a device going up
2984 */
2985static struct notifier_block ipv6_dev_notf = {
2986 .notifier_call = addrconf_notify,
1da177e4
LT		 2987};
2988
93d9b7d7 2989static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2990{
2991 struct inet6_dev *idev;
2992 ASSERT_RTNL();
2993
2994 idev = __in6_dev_get(dev);
2995
93d9b7d7 2996 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2997 ipv6_mc_remap(idev);
93d9b7d7 2998 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2999 ipv6_mc_unmap(idev);
3000}
3001
1da177e4
LT		 3002static int addrconf_ifdown(struct net_device *dev, int how)
3003{
c346dca1 3004 struct net *net = dev_net(dev);
502a2ffd 3005 struct inet6_dev *idev;
3006 struct inet6_ifaddr *ifa;
73a8bd74 3007 int state, i;
1da177e4
LT		 3008
3009 ASSERT_RTNL();
3010
73a8bd74
DM		 3011 rt6_ifdown(net, dev);
3012 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3013
3014 idev = __in6_dev_get(dev);
3015 if (idev == NULL)
3016 return -ENODEV;
3017
bcdd553f
SH		 3018 /*
3019 * Step 1: remove reference to ipv6 device from parent device.
3020 * Do not dev_put!
1da177e4 3021 */
439e2385 3022 if (how) {
1da177e4 3023 idev->dead = 1;
8814c4b5
YH		 3024
3025 /* protected by rtnl_lock */
a9b3cd7f 3026 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3027
3028 /* Step 1.5: remove snmp6 entry */
3029 snmp6_unregister_dev(idev);
3030
3031 }
3032
73a8bd74
DM		 3033 /* Step 2: clear hash table */
3034 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3035 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3036
3037 spin_lock_bh(&addrconf_hash_lock);
3038 restart:
b67bfe0d 3039 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74
DM		 3040 if (ifa->idev == idev) {
3041 hlist_del_init_rcu(&ifa->addr_lst);
3042 addrconf_del_timer(ifa);
3043 goto restart;
3044 }
3045 }
3046 spin_unlock_bh(&addrconf_hash_lock);
3047 }
3048
1da177e4
LT		 3049 write_lock_bh(&idev->lock);
3050
bcdd553f 3051 /* Step 2: clear flags for stateless addrconf */
439e2385 3052 if (!how)
3c21edbd 3053 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3054
1da177e4 3055#ifdef CONFIG_IPV6_PRIVACY
439e2385 3056 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 3057 in6_dev_put(idev);
3058
bcdd553f 3059 /* Step 3: clear tempaddr list */
372e6c8f 3060 while (!list_empty(&idev->tempaddr_list)) {
3061 ifa = list_first_entry(&idev->tempaddr_list,
3062 struct inet6_ifaddr, tmp_list);
3063 list_del(&ifa->tmp_list);
1da177e4
LT		 3064 write_unlock_bh(&idev->lock);
3065 spin_lock_bh(&ifa->lock);
3066
3067 if (ifa->ifpub) {
3068 in6_ifa_put(ifa->ifpub);
3069 ifa->ifpub = NULL;
3070 }
3071 spin_unlock_bh(&ifa->lock);
3072 in6_ifa_put(ifa);
3073 write_lock_bh(&idev->lock);
3074 }
3075#endif
8f37ada5 3076
502a2ffd 3077 while (!list_empty(&idev->addr_list)) {
3078 ifa = list_first_entry(&idev->addr_list,
3079 struct inet6_ifaddr, if_list);
84e8b803 3080 addrconf_del_timer(ifa);
3081
73a8bd74 3082 list_del(&ifa->if_list);
84e8b803 3083
73a8bd74 3084 write_unlock_bh(&idev->lock);
84e8b803 3085
73a8bd74
DM		 3086 spin_lock_bh(&ifa->state_lock);
3087 state = ifa->state;
3088 ifa->state = INET6_IFADDR_STATE_DEAD;
3089 spin_unlock_bh(&ifa->state_lock);
9d82ca98 3090
73a8bd74
DM		 3091 if (state != INET6_IFADDR_STATE_DEAD) {
3092 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3093 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 3094 }
73a8bd74 3095 in6_ifa_put(ifa);
8f37ada5 3096
73a8bd74
DM		 3097 write_lock_bh(&idev->lock);
3098 }
8f37ada5 3099
1da177e4
LT		 3100 write_unlock_bh(&idev->lock);
3101
3102 /* Step 5: Discard multicast list */
439e2385 3103 if (how)
1da177e4
LT		 3104 ipv6_mc_destroy_dev(idev);
3105 else
3106 ipv6_mc_down(idev);
3107
1da177e4 3108 idev->tstamp = jiffies;
1ab1457c 3109
bcdd553f 3110 /* Last: Shot the device (if unregistered) */
439e2385 3111 if (how) {
408c4768 3112 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3113 neigh_parms_release(&nd_tbl, idev->nd_parms);
3114 neigh_ifdown(&nd_tbl, dev);
3115 in6_dev_put(idev);
3116 }
3117 return 0;
3118}
3119
3120static void addrconf_rs_timer(unsigned long data)
3121{
3122 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
5b2a1953 3123 struct inet6_dev *idev = ifp->idev;
1da177e4 3124
5b2a1953 3125 read_lock(&idev->lock);
3126 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3127 goto out;
3128
9ba2add3 3129 if (!ipv6_accept_ra(idev))
5b2a1953 3130 goto out;
3131
3132 /* Announcement received after solicitation was sent */
3133 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3134 goto out;
1da177e4
LT		 3135
3136 spin_lock(&ifp->lock);
5b2a1953 3137 if (ifp->probes++ < idev->cnf.rtr_solicits) {
1da177e4
LT		 3138 /* The wait after the last probe can be shorter */
3139 addrconf_mod_timer(ifp, AC_RS,
5b2a1953 3140 (ifp->probes == idev->cnf.rtr_solicits) ?
3141 idev->cnf.rtr_solicit_delay :
3142 idev->cnf.rtr_solicit_interval);
1da177e4
LT		 3143 spin_unlock(&ifp->lock);
3144
5b2a1953 3145 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 3146 } else {
3147 spin_unlock(&ifp->lock);
3148 /*
3149 * Note: we do not support deprecated "all on-link"
3150 * assumption any longer.
3151 */
91df42be 3152 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3153 }
3154
3155out:
5b2a1953 3156 read_unlock(&idev->lock);
1da177e4
LT		 3157 in6_ifa_put(ifp);
3158}
3159
3160/*
3161 * Duplicate Address Detection
3162 */
3c21edbd
YH		 3163static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3164{
3165 unsigned long rand_num;
3166 struct inet6_dev *idev = ifp->idev;
3167
95c385b4
NH		 3168 if (ifp->flags & IFA_F_OPTIMISTIC)
3169 rand_num = 0;
3170 else
3171 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3172
3c21edbd
YH		 3173 ifp->probes = idev->cnf.dad_transmits;
3174 addrconf_mod_timer(ifp, AC_DAD, rand_num);
3175}
3176
cf22f9a2 3177static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4
LT		 3178{
3179 struct inet6_dev *idev = ifp->idev;
3180 struct net_device *dev = idev->dev;
1da177e4
LT		 3181
3182 addrconf_join_solict(dev, &ifp->addr);
3183
1da177e4 3184 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 3185
3186 read_lock_bh(&idev->lock);
622ccdf1 3187 spin_lock(&ifp->lock);
e9d3e084 3188 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3189 goto out;
1da177e4
LT		 3190
3191 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3192 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3193 !(ifp->flags&IFA_F_TENTATIVE) ||
3194 ifp->flags & IFA_F_NODAD) {
cc411d0b 3195 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3196 spin_unlock(&ifp->lock);
1da177e4
LT		 3197 read_unlock_bh(&idev->lock);
3198
3199 addrconf_dad_completed(ifp);
3200 return;
3201 }
3202
6732bade 3203 if (!(idev->if_flags & IF_READY)) {
21809faf 3204 spin_unlock(&ifp->lock);
6732bade 3205 read_unlock_bh(&idev->lock);
3c21edbd 3206 /*
590a9887 3207 * If the device is not ready:
3c21edbd
YH		 3208 * - keep it tentative if it is a permanent address.
3209 * - otherwise, kill it.
3210 */
3211 in6_ifa_hold(ifp);
cc411d0b 3212 addrconf_dad_stop(ifp, 0);
6732bade 3213 return;
3c21edbd 3214 }
95c385b4
NH		 3215
3216 /*
3217 * Optimistic nodes can start receiving
3218 * Frames right away
3219 */
e21e8467 3220 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 3221 ip6_ins_rt(ifp->rt);
3222
6732bade 3223 addrconf_dad_kick(ifp);
1da177e4 3224out:
622ccdf1 3225 spin_unlock(&ifp->lock);
1da177e4
LT		 3226 read_unlock_bh(&idev->lock);
3227}
3228
3229static void addrconf_dad_timer(unsigned long data)
3230{
3231 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3232 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3233 struct in6_addr mcaddr;
3234
f2344a13
HX		 3235 if (!ifp->probes && addrconf_dad_end(ifp))
3236 goto out;
3237
122e4519 3238 read_lock(&idev->lock);
3239 if (idev->dead || !(idev->if_flags & IF_READY)) {
3240 read_unlock(&idev->lock);
1da177e4
LT		 3241 goto out;
3242 }
21809faf 3243
3244 spin_lock(&ifp->lock);
622ccdf1
HX		 3245 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3246 spin_unlock(&ifp->lock);
3247 read_unlock(&idev->lock);
3248 goto out;
3249 }
3250
1da177e4
LT		 3251 if (ifp->probes == 0) {
3252 /*
3253 * DAD was successful
3254 */
3255
cc411d0b 3256 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3257 spin_unlock(&ifp->lock);
122e4519 3258 read_unlock(&idev->lock);
1da177e4
LT		 3259
3260 addrconf_dad_completed(ifp);
3261
3262 goto out;
3263 }
3264
3265 ifp->probes--;
3266 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
21809faf 3267 spin_unlock(&ifp->lock);
122e4519 3268 read_unlock(&idev->lock);
1da177e4
LT		 3269
3270 /* send a neighbour solicitation for our addr */
1da177e4 3271 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3272 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3273out:
3274 in6_ifa_put(ifp);
3275}
3276
3277static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3278{
e21e8467 3279 struct net_device *dev = ifp->idev->dev;
1da177e4
LT		 3280
3281 /*
3282 * Configure the address for reception. Now it is valid.
3283 */
3284
3285 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3286
026359bc
TA		 3287 /* If added prefix is link local and we are prepared to process
3288 router advertisements, start sending router solicitations.
1da177e4
LT		 3289 */
3290
aeaf6e9d 3291 if (ipv6_accept_ra(ifp->idev) &&
1da177e4
LT		 3292 ifp->idev->cnf.rtr_solicits > 0 &&
3293 (dev->flags&IFF_LOOPBACK) == 0 &&
3294 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 3295 /*
3296 * If a host as already performed a random delay
3297 * [...] as part of DAD [...] there is no need
3298 * to delay again before sending the first RS
3299 */
f3ee4010 3300 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 3301
3302 spin_lock_bh(&ifp->lock);
3303 ifp->probes = 1;
3304 ifp->idev->if_flags |= IF_RS_SENT;
3305 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3306 spin_unlock_bh(&ifp->lock);
3307 }
3308}
3309
e21e8467
SH		 3310static void addrconf_dad_run(struct inet6_dev *idev)
3311{
c5e33bdd
YH		 3312 struct inet6_ifaddr *ifp;
3313
3314 read_lock_bh(&idev->lock);
502a2ffd 3315 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3316 spin_lock(&ifp->lock);
f2344a13
HX		 3317 if (ifp->flags & IFA_F_TENTATIVE &&
3318 ifp->state == INET6_IFADDR_STATE_DAD)
3319 addrconf_dad_kick(ifp);
21809faf 3320 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3321 }
3322 read_unlock_bh(&idev->lock);
3323}
3324
1da177e4
LT		 3325#ifdef CONFIG_PROC_FS
3326struct if6_iter_state {
3c40090a 3327 struct seq_net_private p;
1da177e4 3328 int bucket;
1d578303 3329 int offset;
1da177e4
LT		 3330};
3331
1d578303 3332static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3333{
3334 struct inet6_ifaddr *ifa = NULL;
3335 struct if6_iter_state *state = seq->private;
1218854a 3336 struct net *net = seq_file_net(seq);
1d578303 3337 int p = 0;
1da177e4 3338
1d578303
MM		 3339 /* initial bucket if pos is 0 */
3340 if (pos == 0) {
3341 state->bucket = 0;
3342 state->offset = 0;
3343 }
3344
3345 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3346 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3347 addr_lst) {
9f0d3c27
ED		 3348 if (!net_eq(dev_net(ifa->idev->dev), net))
3349 continue;
1d578303
MM		 3350 /* sync with offset */
3351 if (p < state->offset) {
3352 p++;
3353 continue;
3354 }
3355 state->offset++;
9f0d3c27 3356 return ifa;
1d578303
MM		 3357 }
3358
3359 /* prepare for next bucket */
3360 state->offset = 0;
3361 p = 0;
1da177e4 3362 }
c2e21293 3363 return NULL;
1da177e4
LT		 3364}
3365
c2e21293 3366static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3367 struct inet6_ifaddr *ifa)
1da177e4
LT		 3368{
3369 struct if6_iter_state *state = seq->private;
1218854a 3370 struct net *net = seq_file_net(seq);
1da177e4 3371
b67bfe0d 3372 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3373 if (!net_eq(dev_net(ifa->idev->dev), net))
3374 continue;
1d578303 3375 state->offset++;
9f0d3c27 3376 return ifa;
1d578303 3377 }
3c40090a 3378
c2e21293 3379 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3380 state->offset = 0;
b67bfe0d 3381 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3382 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3383 if (!net_eq(dev_net(ifa->idev->dev), net))
3384 continue;
1d578303 3385 state->offset++;
9f0d3c27 3386 return ifa;
c2e21293 3387 }
1da177e4 3388 }
3c40090a 3389
c2e21293 3390 return NULL;
1da177e4
LT		 3391}
3392
1da177e4 3393static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3394 __acquires(rcu_bh)
1da177e4 3395{
5c578aed 3396 rcu_read_lock_bh();
1d578303 3397 return if6_get_first(seq, *pos);
1da177e4
LT		 3398}
3399
3400static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3401{
3402 struct inet6_ifaddr *ifa;
3403
3404 ifa = if6_get_next(seq, v);
3405 ++*pos;
3406 return ifa;
3407}
3408
3409static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3410 __releases(rcu_bh)
1da177e4 3411{
5c578aed 3412 rcu_read_unlock_bh();
1da177e4
LT		 3413}
3414
3415static int if6_seq_show(struct seq_file *seq, void *v)
3416{
3417 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3418 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3419 &ifp->addr,
1da177e4
LT		 3420 ifp->idev->dev->ifindex,
3421 ifp->prefix_len,
3422 ifp->scope,
3423 ifp->flags,
3424 ifp->idev->dev->name);
3425 return 0;
3426}
3427
56b3d975 3428static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3429 .start = if6_seq_start,
3430 .next = if6_seq_next,
3431 .show = if6_seq_show,
3432 .stop = if6_seq_stop,
3433};
3434
3435static int if6_seq_open(struct inode *inode, struct file *file)
3436{
3c40090a
DL		 3437 return seq_open_net(inode, file, &if6_seq_ops,
3438 sizeof(struct if6_iter_state));
1da177e4
LT		 3439}
3440
9a32144e 3441static const struct file_operations if6_fops = {
1da177e4
LT		 3442 .owner = THIS_MODULE,
3443 .open = if6_seq_open,
3444 .read = seq_read,
3445 .llseek = seq_lseek,
3c40090a 3446 .release = seq_release_net,
1da177e4
LT		 3447};
3448
2c8c1e72 3449static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3450{
d4beaa66 3451 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 3452 return -ENOMEM;
3453 return 0;
3454}
3455
2c8c1e72 3456static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 3457{
ece31ffd 3458 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 3459}
3460
3461static struct pernet_operations if6_proc_net_ops = {
3462 .init = if6_proc_net_init,
3463 .exit = if6_proc_net_exit,
3464};
3465
3466int __init if6_proc_init(void)
3467{
3468 return register_pernet_subsys(&if6_proc_net_ops);
3469}
3470
1da177e4
LT		 3471void if6_proc_exit(void)
3472{
3c40090a 3473 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3474}
3475#endif /* CONFIG_PROC_FS */
3476
07a93626 3477#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3478/* Check if address is a home address configured on any interface. */
b71d1d42 3479int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3480{
3481 int ret = 0;
c2e21293 3482 struct inet6_ifaddr *ifp = NULL;
ddbe5032 3483 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3484
5c578aed 3485 rcu_read_lock_bh();
b67bfe0d 3486 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 3487 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3488 continue;
caad295f 3489 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3490 (ifp->flags & IFA_F_HOMEADDRESS)) {
3491 ret = 1;
3492 break;
3493 }
3494 }
5c578aed 3495 rcu_read_unlock_bh();
3b9f9a1c
NT		 3496 return ret;
3497}
3498#endif
3499
1da177e4
LT		 3500/*
3501 * Periodic address status verification
3502 */
3503
3504static void addrconf_verify(unsigned long foo)
3505{
b2db7564 3506 unsigned long now, next, next_sec, next_sched;
1da177e4 3507 struct inet6_ifaddr *ifp;
1da177e4
LT		 3508 int i;
3509
5c578aed 3510 rcu_read_lock_bh();
3511 spin_lock(&addrconf_verify_lock);
1da177e4 3512 now = jiffies;
b2db7564 3513 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4
LT		 3514
3515 del_timer(&addr_chk_timer);
3516
bcdd553f 3517 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3518restart:
b67bfe0d 3519 hlist_for_each_entry_rcu_bh(ifp,
5c578aed 3520 &inet6_addr_lst[i], addr_lst) {
1da177e4 3521 unsigned long age;
1da177e4
LT		 3522
3523 if (ifp->flags & IFA_F_PERMANENT)
3524 continue;
3525
3526 spin_lock(&ifp->lock);
b2db7564
YH		 3527 /* We try to batch several events at once. */
3528 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3529
8f27ebb9
YH		 3530 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3531 age >= ifp->valid_lft) {
1da177e4
LT		 3532 spin_unlock(&ifp->lock);
3533 in6_ifa_hold(ifp);
1da177e4
LT		 3534 ipv6_del_addr(ifp);
3535 goto restart;
8f27ebb9
YH		 3536 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3537 spin_unlock(&ifp->lock);
3538 continue;
1da177e4 3539 } else if (age >= ifp->prefered_lft) {
a1ed0526 3540 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3541 int deprecate = 0;
3542
3543 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3544 deprecate = 1;
3545 ifp->flags |= IFA_F_DEPRECATED;
3546 }
3547
3548 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3549 next = ifp->tstamp + ifp->valid_lft * HZ;
3550
3551 spin_unlock(&ifp->lock);
3552
3553 if (deprecate) {
3554 in6_ifa_hold(ifp);
1da177e4
LT		 3555
3556 ipv6_ifa_notify(0, ifp);
3557 in6_ifa_put(ifp);
3558 goto restart;
3559 }
3560#ifdef CONFIG_IPV6_PRIVACY
3561 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3562 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3563 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3564 ifp->idev->cnf.dad_transmits *
3565 ifp->idev->nd_parms->retrans_time / HZ;
3566
1da177e4
LT		 3567 if (age >= ifp->prefered_lft - regen_advance) {
3568 struct inet6_ifaddr *ifpub = ifp->ifpub;
3569 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3570 next = ifp->tstamp + ifp->prefered_lft * HZ;
3571 if (!ifp->regen_count && ifpub) {
3572 ifp->regen_count++;
3573 in6_ifa_hold(ifp);
3574 in6_ifa_hold(ifpub);
3575 spin_unlock(&ifp->lock);
5c578aed 3576
291d809b
HY		 3577 spin_lock(&ifpub->lock);
3578 ifpub->regen_count = 0;
3579 spin_unlock(&ifpub->lock);
1da177e4
LT		 3580 ipv6_create_tempaddr(ifpub, ifp);
3581 in6_ifa_put(ifpub);
3582 in6_ifa_put(ifp);
3583 goto restart;
3584 }
3585 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3586 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3587 spin_unlock(&ifp->lock);
3588#endif
3589 } else {
3590 /* ifp->prefered_lft <= ifp->valid_lft */
3591 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3592 next = ifp->tstamp + ifp->prefered_lft * HZ;
3593 spin_unlock(&ifp->lock);
3594 }
3595 }
1da177e4
LT		 3596 }
3597
b2db7564
YH		 3598 next_sec = round_jiffies_up(next);
3599 next_sched = next;
3600
3601 /* If rounded timeout is accurate enough, accept it. */
3602 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3603 next_sched = next_sec;
3604
3605 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3606 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3607 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3608
3609 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3610 now, next, next_sec, next_sched));
3611
3612 addr_chk_timer.expires = next_sched;
1da177e4 3613 add_timer(&addr_chk_timer);
5c578aed 3614 spin_unlock(&addrconf_verify_lock);
3615 rcu_read_unlock_bh();
1da177e4
LT		 3616}
3617
461d8837
TG		 3618static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3619{
3620 struct in6_addr *pfx = NULL;
3621
3622 if (addr)
3623 pfx = nla_data(addr);
3624
3625 if (local) {
3626 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3627 pfx = NULL;
3628 else
3629 pfx = nla_data(local);
3630 }
3631
3632 return pfx;
3633}
3634
ef7c79ed 3635static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3636 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3637 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3638 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3639};
3640
1da177e4 3641static int
661d2967 3642inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3643{
3b1e0a65 3644 struct net *net = sock_net(skb->sk);
b933f716
TG		 3645 struct ifaddrmsg *ifm;
3646 struct nlattr *tb[IFA_MAX+1];
1da177e4 3647 struct in6_addr *pfx;
b933f716 3648 int err;
1da177e4 3649
b933f716
TG		 3650 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3651 if (err < 0)
3652 return err;
3653
3654 ifm = nlmsg_data(nlh);
3655 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3656 if (pfx == NULL)
3657 return -EINVAL;
3658
af284937 3659 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3660}
3661
55ebaef1
NT		 3662static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3663 u32 prefered_lft, u32 valid_lft)
081bba5b 3664{
6f704992
YH		 3665 u32 flags;
3666 clock_t expires;
4bed72e4 3667 unsigned long timeout;
46d48046 3668
081bba5b
NT		 3669 if (!valid_lft || (prefered_lft > valid_lft))
3670 return -EINVAL;
3671
4bed72e4
YH		 3672 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3673 if (addrconf_finite_timeout(timeout)) {
3674 expires = jiffies_to_clock_t(timeout * HZ);
3675 valid_lft = timeout;
6f704992 3676 flags = RTF_EXPIRES;
4bed72e4
YH		 3677 } else {
3678 expires = 0;
3679 flags = 0;
3680 ifa_flags |= IFA_F_PERMANENT;
6f704992 3681 }
081bba5b 3682
4bed72e4
YH		 3683 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3684 if (addrconf_finite_timeout(timeout)) {
3685 if (timeout == 0)
3686 ifa_flags |= IFA_F_DEPRECATED;
3687 prefered_lft = timeout;
3688 }
081bba5b
NT		 3689
3690 spin_lock_bh(&ifp->lock);
3b9f9a1c 3691 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3692 ifp->tstamp = jiffies;
3693 ifp->valid_lft = valid_lft;
3694 ifp->prefered_lft = prefered_lft;
3695
3696 spin_unlock_bh(&ifp->lock);
3697 if (!(ifp->flags&IFA_F_TENTATIVE))
3698 ipv6_ifa_notify(0, ifp);
081bba5b 3699
46d48046 3700 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3701 expires, flags);
081bba5b
NT		 3702 addrconf_verify(0);
3703
3704 return 0;
3705}
3706
1da177e4 3707static int
661d2967 3708inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3709{
3b1e0a65 3710 struct net *net = sock_net(skb->sk);
461d8837
TG		 3711 struct ifaddrmsg *ifm;
3712 struct nlattr *tb[IFA_MAX+1];
1da177e4 3713 struct in6_addr *pfx;
7198f8ce
TG		 3714 struct inet6_ifaddr *ifa;
3715 struct net_device *dev;
55ebaef1
NT		 3716 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3717 u8 ifa_flags;
461d8837 3718 int err;
1da177e4 3719
461d8837
TG		 3720 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3721 if (err < 0)
3722 return err;
3723
3724 ifm = nlmsg_data(nlh);
3725 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3726 if (pfx == NULL)
3727 return -EINVAL;
3728
461d8837 3729 if (tb[IFA_CACHEINFO]) {
0778769d 3730 struct ifa_cacheinfo *ci;
461d8837
TG		 3731
3732 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3733 valid_lft = ci->ifa_valid;
461d8837
TG		 3734 preferred_lft = ci->ifa_prefered;
3735 } else {
3736 preferred_lft = INFINITY_LIFE_TIME;
3737 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3738 }
3739
af284937 3740 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3741 if (dev == NULL)
3742 return -ENODEV;
3743
55ebaef1 3744 /* We ignore other flags so far. */
3b9f9a1c 3745 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3746
1cab3da6 3747 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3748 if (ifa == NULL) {
3749 /*
3750 * It would be best to check for !NLM_F_CREATE here but
3751 * userspace alreay relies on not having to provide this.
3752 */
af284937
DL		 3753 return inet6_addr_add(net, ifm->ifa_index, pfx,
3754 ifm->ifa_prefixlen, ifa_flags,
3755 preferred_lft, valid_lft);
081bba5b
NT		 3756 }
3757
7198f8ce
TG		 3758 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3759 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3760 err = -EEXIST;
3761 else
55ebaef1 3762 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3763
3764 in6_ifa_put(ifa);
3765
3766 return err;
1da177e4
LT		 3767}
3768
101bb229
TG		 3769static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3770 u8 scope, int ifindex)
3771{
3772 struct ifaddrmsg *ifm;
3773
3774 ifm = nlmsg_data(nlh);
3775 ifm->ifa_family = AF_INET6;
3776 ifm->ifa_prefixlen = prefixlen;
3777 ifm->ifa_flags = flags;
3778 ifm->ifa_scope = scope;
3779 ifm->ifa_index = ifindex;
3780}
3781
85486af0
TG		 3782static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3783 unsigned long tstamp, u32 preferred, u32 valid)
3784{
3785 struct ifa_cacheinfo ci;
3786
18a31e1e
TG		 3787 ci.cstamp = cstamp_delta(cstamp);
3788 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 3789 ci.ifa_prefered = preferred;
3790 ci.ifa_valid = valid;
3791
3792 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3793}
3794
101bb229
TG		 3795static inline int rt_scope(int ifa_scope)
3796{
3797 if (ifa_scope & IFA_HOST)
3798 return RT_SCOPE_HOST;
3799 else if (ifa_scope & IFA_LINK)
3800 return RT_SCOPE_LINK;
3801 else if (ifa_scope & IFA_SITE)
3802 return RT_SCOPE_SITE;
3803 else
3804 return RT_SCOPE_UNIVERSE;
3805}
3806
0ab6803b
TG		 3807static inline int inet6_ifaddr_msgsize(void)
3808{
339bf98f
TG		 3809 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
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
0ab6803b 3848 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3849 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3850 nlmsg_cancel(skb, nlh);
3851 return -EMSGSIZE;
3852 }
1da177e4 3853
0ab6803b 3854 return nlmsg_end(skb, nlh);
1da177e4
LT		 3855}
3856
3857static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 3858 u32 portid, u32 seq, int event, u16 flags)
1da177e4 3859{
1da177e4 3860 struct nlmsghdr *nlh;
101bb229
TG		 3861 u8 scope = RT_SCOPE_UNIVERSE;
3862 int ifindex = ifmca->idev->dev->ifindex;
3863
3864 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3865 scope = RT_SCOPE_SITE;
1da177e4 3866
15e47304 3867 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3868 if (nlh == NULL)
26932566 3869 return -EMSGSIZE;
85486af0 3870
0ab6803b
TG		 3871 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3872 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3873 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3874 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3875 nlmsg_cancel(skb, nlh);
3876 return -EMSGSIZE;
3877 }
85486af0 3878
0ab6803b 3879 return nlmsg_end(skb, nlh);
1da177e4
LT		 3880}
3881
3882static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 3883 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3884{
1da177e4 3885 struct nlmsghdr *nlh;
101bb229
TG		 3886 u8 scope = RT_SCOPE_UNIVERSE;
3887 int ifindex = ifaca->aca_idev->dev->ifindex;
3888
3889 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3890 scope = RT_SCOPE_SITE;
1da177e4 3891
15e47304 3892 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3893 if (nlh == NULL)
26932566 3894 return -EMSGSIZE;
85486af0 3895
0ab6803b
TG		 3896 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3897 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3898 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3899 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3900 nlmsg_cancel(skb, nlh);
3901 return -EMSGSIZE;
3902 }
1da177e4 3903
0ab6803b 3904 return nlmsg_end(skb, nlh);
1da177e4
LT		 3905}
3906
e21e8467 3907enum addr_type_t {
1da177e4
LT		 3908 UNICAST_ADDR,
3909 MULTICAST_ADDR,
3910 ANYCAST_ADDR,
3911};
3912
234b27c3
ED		 3913/* called with rcu_read_lock() */
3914static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3915 struct netlink_callback *cb, enum addr_type_t type,
3916 int s_ip_idx, int *p_ip_idx)
3917{
234b27c3
ED		 3918 struct ifmcaddr6 *ifmca;
3919 struct ifacaddr6 *ifaca;
3920 int err = 1;
3921 int ip_idx = *p_ip_idx;
3922
3923 read_lock_bh(&idev->lock);
3924 switch (type) {
502a2ffd 3925 case UNICAST_ADDR: {
3926 struct inet6_ifaddr *ifa;
3927
234b27c3 3928 /* unicast address incl. temp addr */
502a2ffd 3929 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3930 if (++ip_idx < s_ip_idx)
234b27c3
ED		 3931 continue;
3932 err = inet6_fill_ifaddr(skb, ifa,
15e47304 3933 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3934 cb->nlh->nlmsg_seq,
3935 RTM_NEWADDR,
3936 NLM_F_MULTI);
3937 if (err <= 0)
3938 break;
63998ac2 3939 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 3940 }
3941 break;
502a2ffd 3942 }
234b27c3
ED		 3943 case MULTICAST_ADDR:
3944 /* multicast address */
3945 for (ifmca = idev->mc_list; ifmca;
3946 ifmca = ifmca->next, ip_idx++) {
3947 if (ip_idx < s_ip_idx)
3948 continue;
3949 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 3950 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3951 cb->nlh->nlmsg_seq,
3952 RTM_GETMULTICAST,
3953 NLM_F_MULTI);
3954 if (err <= 0)
3955 break;
3956 }
3957 break;
3958 case ANYCAST_ADDR:
3959 /* anycast address */
3960 for (ifaca = idev->ac_list; ifaca;
3961 ifaca = ifaca->aca_next, ip_idx++) {
3962 if (ip_idx < s_ip_idx)
3963 continue;
3964 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 3965 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3966 cb->nlh->nlmsg_seq,
3967 RTM_GETANYCAST,
3968 NLM_F_MULTI);
3969 if (err <= 0)
3970 break;
3971 }
3972 break;
3973 default:
3974 break;
3975 }
3976 read_unlock_bh(&idev->lock);
3977 *p_ip_idx = ip_idx;
3978 return err;
3979}
3980
1da177e4
LT		 3981static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3982 enum addr_type_t type)
3983{
234b27c3
ED		 3984 struct net *net = sock_net(skb->sk);
3985 int h, s_h;
1da177e4
LT		 3986 int idx, ip_idx;
3987 int s_idx, s_ip_idx;
1da177e4 3988 struct net_device *dev;
234b27c3
ED		 3989 struct inet6_dev *idev;
3990 struct hlist_head *head;
1ab1457c 3991
234b27c3
ED		 3992 s_h = cb->args[0];
3993 s_idx = idx = cb->args[1];
3994 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 3995
234b27c3 3996 rcu_read_lock();
63998ac2 3997 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 3998 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3999 idx = 0;
4000 head = &net->dev_index_head[h];
b67bfe0d 4001 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4002 if (idx < s_idx)
4003 goto cont;
4b97efdf 4004 if (h > s_h || idx > s_idx)
234b27c3
ED		 4005 s_ip_idx = 0;
4006 ip_idx = 0;
e21e8467
SH		 4007 idev = __in6_dev_get(dev);
4008 if (!idev)
234b27c3
ED		 4009 goto cont;
4010
4011 if (in6_dump_addrs(idev, skb, cb, type,
4012 s_ip_idx, &ip_idx) <= 0)
4013 goto done;
7562f876 4014cont:
234b27c3
ED		 4015 idx++;
4016 }
1da177e4 4017 }
234b27c3
ED		 4018done:
4019 rcu_read_unlock();
4020 cb->args[0] = h;
4021 cb->args[1] = idx;
4022 cb->args[2] = ip_idx;
4023
1da177e4
LT		 4024 return skb->len;
4025}
4026
4027static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4028{
4029 enum addr_type_t type = UNICAST_ADDR;
b854272b 4030
1da177e4
LT		 4031 return inet6_dump_addr(skb, cb, type);
4032}
4033
4034static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4035{
4036 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4037
1da177e4
LT		 4038 return inet6_dump_addr(skb, cb, type);
4039}
4040
4041
4042static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4043{
4044 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4045
1da177e4
LT		 4046 return inet6_dump_addr(skb, cb, type);
4047}
4048
661d2967 4049static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4050{
3b1e0a65 4051 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4052 struct ifaddrmsg *ifm;
4053 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 4054 struct in6_addr *addr = NULL;
4055 struct net_device *dev = NULL;
4056 struct inet6_ifaddr *ifa;
4057 struct sk_buff *skb;
6c223828
NT		 4058 int err;
4059
1b29fc2c
TG		 4060 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4061 if (err < 0)
4062 goto errout;
4063
4064 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
4065 if (addr == NULL) {
4066 err = -EINVAL;
4067 goto errout;
6c223828 4068 }
6c223828 4069
1b29fc2c 4070 ifm = nlmsg_data(nlh);
6c223828 4071 if (ifm->ifa_index)
6fda7350 4072 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4073
e21e8467
SH		 4074 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4075 if (!ifa) {
1b29fc2c
TG		 4076 err = -EADDRNOTAVAIL;
4077 goto errout;
4078 }
6c223828 4079
e21e8467
SH		 4080 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4081 if (!skb) {
6c223828 4082 err = -ENOBUFS;
1b29fc2c 4083 goto errout_ifa;
6c223828
NT		 4084 }
4085
15e47304 4086 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4087 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4088 if (err < 0) {
4089 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4090 WARN_ON(err == -EMSGSIZE);
4091 kfree_skb(skb);
4092 goto errout_ifa;
4093 }
15e47304 4094 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4095errout_ifa:
6c223828 4096 in6_ifa_put(ifa);
1b29fc2c 4097errout:
6c223828 4098 return err;
6c223828
NT		 4099}
4100
1da177e4
LT		 4101static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4102{
4103 struct sk_buff *skb;
c346dca1 4104 struct net *net = dev_net(ifa->idev->dev);
5d620266 4105 int err = -ENOBUFS;
1da177e4 4106
0ab6803b 4107 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 4108 if (skb == NULL)
4109 goto errout;
4110
4111 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4112 if (err < 0) {
4113 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4114 WARN_ON(err == -EMSGSIZE);
4115 kfree_skb(skb);
4116 goto errout;
4117 }
1ce85fe4
PNA		 4118 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4119 return;
5d620266
TG		 4120errout:
4121 if (err < 0)
6fda7350 4122 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4123}
4124
b6f99a21 4125static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4126 __s32 *array, int bytes)
4127{
04561c1f
TG		 4128 BUG_ON(bytes < (DEVCONF_MAX * 4));
4129
1da177e4
LT		 4130 memset(array, 0, bytes);
4131 array[DEVCONF_FORWARDING] = cnf->forwarding;
4132 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4133 array[DEVCONF_MTU6] = cnf->mtu6;
4134 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4135 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4136 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4137 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4138 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4139 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4140 jiffies_to_msecs(cnf->rtr_solicit_interval);
4141 array[DEVCONF_RTR_SOLICIT_DELAY] =
4142 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4
LT		 4143 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4144#ifdef CONFIG_IPV6_PRIVACY
4145 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4146 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4147 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4148 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4149 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4150#endif
4151 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4152 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 4153 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4154#ifdef CONFIG_IPV6_ROUTER_PREF
4155 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4156 array[DEVCONF_RTR_PROBE_INTERVAL] =
4157 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4158#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4159 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4160#endif
930d6ff2 4161#endif
fbea49e1 4162 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4163 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4164#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4165 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4166#endif
7bc570c8
YH		 4167#ifdef CONFIG_IPV6_MROUTE
4168 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4169#endif
778d80be 4170 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4171 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4172 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4173 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
1da177e4
LT		 4174}
4175
b382b191
TG		 4176static inline size_t inet6_ifla6_size(void)
4177{
4178 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4179 + nla_total_size(sizeof(struct ifla_cacheinfo))
4180 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4181 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4182 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4183 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4184}
4185
339bf98f
TG		 4186static inline size_t inet6_if_nlmsg_size(void)
4187{
4188 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4189 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4190 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4191 + nla_total_size(4) /* IFLA_MTU */
4192 + nla_total_size(4) /* IFLA_LINK */
b382b191 4193 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4194}
c5396a31 4195
be281e55 4196static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4197 int items, int bytes)
7f7d9a6b
HX		 4198{
4199 int i;
4200 int pad = bytes - sizeof(u64) * items;
4201 BUG_ON(pad < 0);
4202
4203 /* Use put_unaligned() because stats may not be aligned for u64. */
4204 put_unaligned(items, &stats[0]);
4205 for (i = 1; i < items; i++)
be281e55 4206 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4207
4208 memset(&stats[items], 0, pad);
4209}
4210
4ce3c183
ED		 4211static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4212 int items, int bytes, size_t syncpoff)
4213{
4214 int i;
4215 int pad = bytes - sizeof(u64) * items;
4216 BUG_ON(pad < 0);
4217
4218 /* Use put_unaligned() because stats may not be aligned for u64. */
4219 put_unaligned(items, &stats[0]);
4220 for (i = 1; i < items; i++)
4221 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4222
4223 memset(&stats[items], 0, pad);
4224}
4225
7f7d9a6b
HX		 4226static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4227 int bytes)
4228{
e21e8467 4229 switch (attrtype) {
7f7d9a6b 4230 case IFLA_INET6_STATS:
4ce3c183
ED		 4231 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4232 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4233 break;
4234 case IFLA_INET6_ICMP6STATS:
be281e55 4235 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4236 break;
4237 }
4238}
4239
b382b191
TG		 4240static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4241{
4242 struct nlattr *nla;
4243 struct ifla_cacheinfo ci;
4244
c78679e8
DM		 4245 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4246 goto nla_put_failure;
b382b191 4247 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4248 ci.tstamp = cstamp_delta(idev->tstamp);
4249 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4250 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
c78679e8
DM		 4251 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4252 goto nla_put_failure;
b382b191
TG		 4253 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4254 if (nla == NULL)
4255 goto nla_put_failure;
4256 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4257
4258 /* XXX - MC not implemented */
4259
4260 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4261 if (nla == NULL)
4262 goto nla_put_failure;
4263 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4264
4265 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4266 if (nla == NULL)
4267 goto nla_put_failure;
4268 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4269
f53adae4
DB		 4270 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4271 if (nla == NULL)
4272 goto nla_put_failure;
4273 read_lock_bh(&idev->lock);
4274 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4275 read_unlock_bh(&idev->lock);
4276
b382b191
TG		 4277 return 0;
4278
4279nla_put_failure:
4280 return -EMSGSIZE;
4281}
4282
4283static size_t inet6_get_link_af_size(const struct net_device *dev)
4284{
4285 if (!__in6_dev_get(dev))
4286 return 0;
4287
4288 return inet6_ifla6_size();
4289}
4290
4291static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4292{
4293 struct inet6_dev *idev = __in6_dev_get(dev);
4294
4295 if (!idev)
4296 return -ENODATA;
4297
4298 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4299 return -EMSGSIZE;
4300
4301 return 0;
4302}
4303
f53adae4
DB		 4304static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4305{
f53adae4
DB		 4306 struct inet6_ifaddr *ifp;
4307 struct net_device *dev = idev->dev;
fc403832 4308 bool update_rs = false;
f53adae4
DB		 4309
4310 if (token == NULL)
4311 return -EINVAL;
4312 if (ipv6_addr_any(token))
4313 return -EINVAL;
4314 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4315 return -EINVAL;
f53adae4
DB		 4316 if (!ipv6_accept_ra(idev))
4317 return -EINVAL;
4318 if (idev->cnf.rtr_solicits <= 0)
4319 return -EINVAL;
4320
4321 write_lock_bh(&idev->lock);
4322
4323 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4324 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4325
4326 write_unlock_bh(&idev->lock);
4327
fc403832
DB		 4328 if (!idev->dead && (idev->if_flags & IF_READY)) {
4329 struct in6_addr ll_addr;
4330
4331 ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4332 IFA_F_OPTIMISTIC);
4333
4334 /* If we're not ready, then normal ifup will take care
4335 * of this. Otherwise, we need to request our rs here.
4336 */
4337 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4338 update_rs = true;
4339 }
f53adae4
DB		 4340
4341 write_lock_bh(&idev->lock);
fc403832
DB		 4342
4343 if (update_rs)
4344 idev->if_flags |= IF_RS_SENT;
f53adae4
DB		 4345
4346 /* Well, that's kinda nasty ... */
4347 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4348 spin_lock(&ifp->lock);
617fe29d 4349 if (ifp->tokenized) {
f53adae4
DB		 4350 ifp->valid_lft = 0;
4351 ifp->prefered_lft = 0;
4352 }
4353 spin_unlock(&ifp->lock);
4354 }
4355
4356 write_unlock_bh(&idev->lock);
4357 return 0;
4358}
4359
4360static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4361{
4362 int err = -EINVAL;
4363 struct inet6_dev *idev = __in6_dev_get(dev);
4364 struct nlattr *tb[IFLA_INET6_MAX + 1];
4365
4366 if (!idev)
4367 return -EAFNOSUPPORT;
4368
4369 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4370 BUG();
4371
4372 if (tb[IFLA_INET6_TOKEN])
4373 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4374
4375 return err;
4376}
4377
1ab1457c 4378static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4379 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4380{
04561c1f 4381 struct net_device *dev = idev->dev;
04561c1f
TG		 4382 struct ifinfomsg *hdr;
4383 struct nlmsghdr *nlh;
4384 void *protoinfo;
04561c1f 4385
15e47304 4386 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
04561c1f 4387 if (nlh == NULL)
26932566 4388 return -EMSGSIZE;
04561c1f
TG		 4389
4390 hdr = nlmsg_data(nlh);
4391 hdr->ifi_family = AF_INET6;
4392 hdr->__ifi_pad = 0;
4393 hdr->ifi_type = dev->type;
4394 hdr->ifi_index = dev->ifindex;
4395 hdr->ifi_flags = dev_get_flags(dev);
4396 hdr->ifi_change = 0;
4397
c78679e8
DM		 4398 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4399 (dev->addr_len &&
4400 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4401 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4402 (dev->ifindex != dev->iflink &&
4403 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4404 goto nla_put_failure;
04561c1f
TG		 4405 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4406 if (protoinfo == NULL)
4407 goto nla_put_failure;
1da177e4 4408
b382b191 4409 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4410 goto nla_put_failure;
1da177e4 4411
04561c1f
TG		 4412 nla_nest_end(skb, protoinfo);
4413 return nlmsg_end(skb, nlh);
1da177e4 4414
04561c1f 4415nla_put_failure:
26932566
PM		 4416 nlmsg_cancel(skb, nlh);
4417 return -EMSGSIZE;
1da177e4
LT		 4418}
4419
4420static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4421{
3b1e0a65 4422 struct net *net = sock_net(skb->sk);
84d2697d 4423 int h, s_h;
434a8a58 4424 int idx = 0, s_idx;
1da177e4
LT		 4425 struct net_device *dev;
4426 struct inet6_dev *idev;
84d2697d 4427 struct hlist_head *head;
1da177e4 4428
84d2697d
ED		 4429 s_h = cb->args[0];
4430 s_idx = cb->args[1];
4431
4432 rcu_read_lock();
4433 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4434 idx = 0;
4435 head = &net->dev_index_head[h];
b67bfe0d 4436 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 4437 if (idx < s_idx)
4438 goto cont;
4439 idev = __in6_dev_get(dev);
4440 if (!idev)
4441 goto cont;
4442 if (inet6_fill_ifinfo(skb, idev,
15e47304 4443 NETLINK_CB(cb->skb).portid,
84d2697d
ED		 4444 cb->nlh->nlmsg_seq,
4445 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4446 goto out;
7562f876 4447cont:
84d2697d
ED		 4448 idx++;
4449 }
1da177e4 4450 }
84d2697d
ED		 4451out:
4452 rcu_read_unlock();
4453 cb->args[1] = idx;
4454 cb->args[0] = h;
1da177e4
LT		 4455
4456 return skb->len;
4457}
4458
4459void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4460{
4461 struct sk_buff *skb;
c346dca1 4462 struct net *net = dev_net(idev->dev);
8d7a76c9 4463 int err = -ENOBUFS;
1ab1457c 4464
339bf98f 4465 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4466 if (skb == NULL)
4467 goto errout;
4468
4469 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4470 if (err < 0) {
4471 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4472 WARN_ON(err == -EMSGSIZE);
4473 kfree_skb(skb);
4474 goto errout;
4475 }
5f75a104 4476 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4477 return;
8d7a76c9
TG		 4478errout:
4479 if (err < 0)
5f75a104 4480 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4481}
4482
339bf98f
TG		 4483static inline size_t inet6_prefix_nlmsg_size(void)
4484{
4485 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4486 + nla_total_size(sizeof(struct in6_addr))
4487 + nla_total_size(sizeof(struct prefix_cacheinfo));
4488}
c5396a31 4489
1da177e4 4490static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4491 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 4492 int event, unsigned int flags)
1da177e4 4493{
6051e2f4
TG		 4494 struct prefixmsg *pmsg;
4495 struct nlmsghdr *nlh;
1da177e4
LT		 4496 struct prefix_cacheinfo ci;
4497
15e47304 4498 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6051e2f4 4499 if (nlh == NULL)
26932566 4500 return -EMSGSIZE;
6051e2f4
TG		 4501
4502 pmsg = nlmsg_data(nlh);
1da177e4 4503 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4504 pmsg->prefix_pad1 = 0;
4505 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4506 pmsg->prefix_ifindex = idev->dev->ifindex;
4507 pmsg->prefix_len = pinfo->prefix_len;
4508 pmsg->prefix_type = pinfo->type;
8a47077a 4509 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4510 pmsg->prefix_flags = 0;
4511 if (pinfo->onlink)
4512 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4513 if (pinfo->autoconf)
4514 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4515
c78679e8
DM		 4516 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4517 goto nla_put_failure;
1da177e4
LT		 4518 ci.preferred_time = ntohl(pinfo->prefered);
4519 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 4520 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4521 goto nla_put_failure;
6051e2f4 4522 return nlmsg_end(skb, nlh);
1da177e4 4523
6051e2f4 4524nla_put_failure:
26932566
PM		 4525 nlmsg_cancel(skb, nlh);
4526 return -EMSGSIZE;
1da177e4
LT		 4527}
4528
1ab1457c 4529static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4530 struct prefix_info *pinfo)
4531{
4532 struct sk_buff *skb;
c346dca1 4533 struct net *net = dev_net(idev->dev);
8c384bfa 4534 int err = -ENOBUFS;
1da177e4 4535
339bf98f 4536 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4537 if (skb == NULL)
4538 goto errout;
4539
4540 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4541 if (err < 0) {
4542 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4543 WARN_ON(err == -EMSGSIZE);
4544 kfree_skb(skb);
4545 goto errout;
4546 }
1ce85fe4
PNA		 4547 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4548 return;
8c384bfa
TG		 4549errout:
4550 if (err < 0)
6fda7350 4551 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4552}
4553
1da177e4
LT		 4554static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4555{
63998ac2
ND		 4556 struct net *net = dev_net(ifp->idev->dev);
4557
1da177e4
LT		 4558 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4559
4560 switch (event) {
4561 case RTM_NEWADDR:
95c385b4
NH		 4562 /*
4563 * If the address was optimistic
4564 * we inserted the route at the start of
4565 * our DAD process, so we don't need
4566 * to do it again
4567 */
4568 if (!(ifp->rt->rt6i_node))
4569 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4570 if (ifp->idev->cnf.forwarding)
4571 addrconf_join_anycast(ifp);
4572 break;
4573 case RTM_DELADDR:
4574 if (ifp->idev->cnf.forwarding)
4575 addrconf_leave_anycast(ifp);
4576 addrconf_leave_solict(ifp->idev, &ifp->addr);
d8d1f30b 4577 dst_hold(&ifp->rt->dst);
93fa159a 4578
73a8bd74 4579 if (ip6_del_rt(ifp->rt))
d8d1f30b 4580 dst_free(&ifp->rt->dst);
1da177e4
LT		 4581 break;
4582 }
63998ac2 4583 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 4584}
4585
4586static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4587{
8814c4b5 4588 rcu_read_lock_bh();
1da177e4
LT		 4589 if (likely(ifp->idev->dead == 0))
4590 __ipv6_ifa_notify(event, ifp);
8814c4b5 4591 rcu_read_unlock_bh();
1da177e4
LT		 4592}
4593
4594#ifdef CONFIG_SYSCTL
4595
4596static
8d65af78 4597int addrconf_sysctl_forward(ctl_table *ctl, int write,
1da177e4
LT		 4598 void __user *buffer, size_t *lenp, loff_t *ppos)
4599{
4600 int *valp = ctl->data;
4601 int val = *valp;
88af182e 4602 loff_t pos = *ppos;
013d97e9 4603 ctl_table lctl;
1da177e4
LT		 4604 int ret;
4605
013d97e9
FR		 4606 /*
4607 * ctl->data points to idev->cnf.forwarding, we should
4608 * not modify it until we get the rtnl lock.
4609 */
4610 lctl = *ctl;
4611 lctl.data = &val;
4612
4613 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 4614
c8fecf22 4615 if (write)
b325fddb 4616 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4617 if (ret)
4618 *ppos = pos;
1ab1457c 4619 return ret;
1da177e4
LT		 4620}
4621
56d417b1
BH		 4622static void dev_disable_change(struct inet6_dev *idev)
4623{
4624 if (!idev || !idev->dev)
4625 return;
4626
4627 if (idev->cnf.disable_ipv6)
4628 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4629 else
4630 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4631}
4632
4633static void addrconf_disable_change(struct net *net, __s32 newf)
4634{
4635 struct net_device *dev;
4636 struct inet6_dev *idev;
4637
c6d14c84
ED		 4638 rcu_read_lock();
4639 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4640 idev = __in6_dev_get(dev);
4641 if (idev) {
4642 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4643 idev->cnf.disable_ipv6 = newf;
4644 if (changed)
4645 dev_disable_change(idev);
4646 }
56d417b1 4647 }
c6d14c84 4648 rcu_read_unlock();
56d417b1
BH		 4649}
4650
013d97e9 4651static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 4652{
4653 struct net *net;
013d97e9
FR		 4654 int old;
4655
4656 if (!rtnl_trylock())
4657 return restart_syscall();
56d417b1
BH		 4658
4659 net = (struct net *)table->extra2;
013d97e9
FR		 4660 old = *p;
4661 *p = newf;
56d417b1 4662
013d97e9
FR		 4663 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4664 rtnl_unlock();
56d417b1 4665 return 0;
88af182e 4666 }
56d417b1
BH		 4667
4668 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 4669 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4670 addrconf_disable_change(net, newf);
013d97e9 4671 } else if ((!newf) ^ (!old))
56d417b1
BH		 4672 dev_disable_change((struct inet6_dev *)table->extra1);
4673
4674 rtnl_unlock();
4675 return 0;
4676}
4677
4678static
8d65af78 4679int addrconf_sysctl_disable(ctl_table *ctl, int write,
56d417b1
BH		 4680 void __user *buffer, size_t *lenp, loff_t *ppos)
4681{
4682 int *valp = ctl->data;
4683 int val = *valp;
88af182e 4684 loff_t pos = *ppos;
013d97e9 4685 ctl_table lctl;
56d417b1
BH		 4686 int ret;
4687
013d97e9
FR		 4688 /*
4689 * ctl->data points to idev->cnf.disable_ipv6, we should
4690 * not modify it until we get the rtnl lock.
4691 */
4692 lctl = *ctl;
4693 lctl.data = &val;
4694
4695 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 4696
4697 if (write)
4698 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4699 if (ret)
4700 *ppos = pos;
56d417b1
BH		 4701 return ret;
4702}
4703
1da177e4
LT		 4704static struct addrconf_sysctl_table
4705{
4706 struct ctl_table_header *sysctl_header;
f6a07b29 4707 ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 4708} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4709 .sysctl_header = NULL,
4710 .addrconf_vars = {
1ab1457c 4711 {
e21e8467
SH		 4712 .procname = "forwarding",
4713 .data = &ipv6_devconf.forwarding,
4714 .maxlen = sizeof(int),
4715 .mode = 0644,
4716 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4717 },
4718 {
e21e8467
SH		 4719 .procname = "hop_limit",
4720 .data = &ipv6_devconf.hop_limit,
4721 .maxlen = sizeof(int),
4722 .mode = 0644,
4723 .proc_handler = proc_dointvec,
1da177e4
LT		 4724 },
4725 {
e21e8467
SH		 4726 .procname = "mtu",
4727 .data = &ipv6_devconf.mtu6,
4728 .maxlen = sizeof(int),
4729 .mode = 0644,
4730 .proc_handler = proc_dointvec,
1da177e4
LT		 4731 },
4732 {
e21e8467
SH		 4733 .procname = "accept_ra",
4734 .data = &ipv6_devconf.accept_ra,
4735 .maxlen = sizeof(int),
4736 .mode = 0644,
4737 .proc_handler = proc_dointvec,
1da177e4
LT		 4738 },
4739 {
e21e8467
SH		 4740 .procname = "accept_redirects",
4741 .data = &ipv6_devconf.accept_redirects,
4742 .maxlen = sizeof(int),
4743 .mode = 0644,
4744 .proc_handler = proc_dointvec,
1da177e4
LT		 4745 },
4746 {
e21e8467
SH		 4747 .procname = "autoconf",
4748 .data = &ipv6_devconf.autoconf,
4749 .maxlen = sizeof(int),
4750 .mode = 0644,
4751 .proc_handler = proc_dointvec,
1da177e4
LT		 4752 },
4753 {
e21e8467
SH		 4754 .procname = "dad_transmits",
4755 .data = &ipv6_devconf.dad_transmits,
4756 .maxlen = sizeof(int),
4757 .mode = 0644,
4758 .proc_handler = proc_dointvec,
1da177e4
LT		 4759 },
4760 {
e21e8467
SH		 4761 .procname = "router_solicitations",
4762 .data = &ipv6_devconf.rtr_solicits,
4763 .maxlen = sizeof(int),
4764 .mode = 0644,
4765 .proc_handler = proc_dointvec,
1da177e4
LT		 4766 },
4767 {
e21e8467
SH		 4768 .procname = "router_solicitation_interval",
4769 .data = &ipv6_devconf.rtr_solicit_interval,
4770 .maxlen = sizeof(int),
4771 .mode = 0644,
4772 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4773 },
4774 {
e21e8467
SH		 4775 .procname = "router_solicitation_delay",
4776 .data = &ipv6_devconf.rtr_solicit_delay,
4777 .maxlen = sizeof(int),
4778 .mode = 0644,
4779 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4780 },
4781 {
e21e8467
SH		 4782 .procname = "force_mld_version",
4783 .data = &ipv6_devconf.force_mld_version,
4784 .maxlen = sizeof(int),
4785 .mode = 0644,
4786 .proc_handler = proc_dointvec,
1da177e4
LT		 4787 },
4788#ifdef CONFIG_IPV6_PRIVACY
4789 {
e21e8467
SH		 4790 .procname = "use_tempaddr",
4791 .data = &ipv6_devconf.use_tempaddr,
4792 .maxlen = sizeof(int),
4793 .mode = 0644,
4794 .proc_handler = proc_dointvec,
1da177e4
LT		 4795 },
4796 {
e21e8467
SH		 4797 .procname = "temp_valid_lft",
4798 .data = &ipv6_devconf.temp_valid_lft,
4799 .maxlen = sizeof(int),
4800 .mode = 0644,
4801 .proc_handler = proc_dointvec,
1da177e4
LT		 4802 },
4803 {
e21e8467
SH		 4804 .procname = "temp_prefered_lft",
4805 .data = &ipv6_devconf.temp_prefered_lft,
4806 .maxlen = sizeof(int),
4807 .mode = 0644,
4808 .proc_handler = proc_dointvec,
1da177e4
LT		 4809 },
4810 {
e21e8467
SH		 4811 .procname = "regen_max_retry",
4812 .data = &ipv6_devconf.regen_max_retry,
4813 .maxlen = sizeof(int),
4814 .mode = 0644,
4815 .proc_handler = proc_dointvec,
1da177e4
LT		 4816 },
4817 {
e21e8467
SH		 4818 .procname = "max_desync_factor",
4819 .data = &ipv6_devconf.max_desync_factor,
4820 .maxlen = sizeof(int),
4821 .mode = 0644,
4822 .proc_handler = proc_dointvec,
1da177e4
LT		 4823 },
4824#endif
4825 {
e21e8467
SH		 4826 .procname = "max_addresses",
4827 .data = &ipv6_devconf.max_addresses,
4828 .maxlen = sizeof(int),
4829 .mode = 0644,
4830 .proc_handler = proc_dointvec,
1da177e4 4831 },
65f5c7c1 4832 {
e21e8467
SH		 4833 .procname = "accept_ra_defrtr",
4834 .data = &ipv6_devconf.accept_ra_defrtr,
4835 .maxlen = sizeof(int),
4836 .mode = 0644,
4837 .proc_handler = proc_dointvec,
65f5c7c1 4838 },
c4fd30eb 4839 {
e21e8467
SH		 4840 .procname = "accept_ra_pinfo",
4841 .data = &ipv6_devconf.accept_ra_pinfo,
4842 .maxlen = sizeof(int),
4843 .mode = 0644,
4844 .proc_handler = proc_dointvec,
c4fd30eb 4845 },
930d6ff2
YH		 4846#ifdef CONFIG_IPV6_ROUTER_PREF
4847 {
e21e8467
SH		 4848 .procname = "accept_ra_rtr_pref",
4849 .data = &ipv6_devconf.accept_ra_rtr_pref,
4850 .maxlen = sizeof(int),
4851 .mode = 0644,
4852 .proc_handler = proc_dointvec,
930d6ff2 4853 },
52e16356 4854 {
e21e8467
SH		 4855 .procname = "router_probe_interval",
4856 .data = &ipv6_devconf.rtr_probe_interval,
4857 .maxlen = sizeof(int),
4858 .mode = 0644,
4859 .proc_handler = proc_dointvec_jiffies,
52e16356 4860 },
fa03ef38 4861#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4862 {
e21e8467
SH		 4863 .procname = "accept_ra_rt_info_max_plen",
4864 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4865 .maxlen = sizeof(int),
4866 .mode = 0644,
4867 .proc_handler = proc_dointvec,
09c884d4
YH		 4868 },
4869#endif
930d6ff2 4870#endif
fbea49e1 4871 {
e21e8467
SH		 4872 .procname = "proxy_ndp",
4873 .data = &ipv6_devconf.proxy_ndp,
4874 .maxlen = sizeof(int),
4875 .mode = 0644,
4876 .proc_handler = proc_dointvec,
fbea49e1 4877 },
0bcbc926 4878 {
e21e8467
SH		 4879 .procname = "accept_source_route",
4880 .data = &ipv6_devconf.accept_source_route,
4881 .maxlen = sizeof(int),
4882 .mode = 0644,
4883 .proc_handler = proc_dointvec,
0bcbc926 4884 },
95c385b4
NH		 4885#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4886 {
e21e8467
SH		 4887 .procname = "optimistic_dad",
4888 .data = &ipv6_devconf.optimistic_dad,
4889 .maxlen = sizeof(int),
4890 .mode = 0644,
4891 .proc_handler = proc_dointvec,
95c385b4
NH		 4892
4893 },
7bc570c8
YH		 4894#endif
4895#ifdef CONFIG_IPV6_MROUTE
4896 {
e21e8467
SH		 4897 .procname = "mc_forwarding",
4898 .data = &ipv6_devconf.mc_forwarding,
4899 .maxlen = sizeof(int),
4900 .mode = 0444,
4901 .proc_handler = proc_dointvec,
7bc570c8 4902 },
95c385b4 4903#endif
778d80be 4904 {
e21e8467
SH		 4905 .procname = "disable_ipv6",
4906 .data = &ipv6_devconf.disable_ipv6,
4907 .maxlen = sizeof(int),
4908 .mode = 0644,
4909 .proc_handler = addrconf_sysctl_disable,
778d80be 4910 },
1b34be74 4911 {
e21e8467
SH		 4912 .procname = "accept_dad",
4913 .data = &ipv6_devconf.accept_dad,
4914 .maxlen = sizeof(int),
4915 .mode = 0644,
4916 .proc_handler = proc_dointvec,
1b34be74 4917 },
f7734fdf 4918 {
f7734fdf
OP		 4919 .procname = "force_tllao",
4920 .data = &ipv6_devconf.force_tllao,
4921 .maxlen = sizeof(int),
4922 .mode = 0644,
4923 .proc_handler = proc_dointvec
4924 },
5cb04436
HFS		 4925 {
4926 .procname = "ndisc_notify",
4927 .data = &ipv6_devconf.ndisc_notify,
4928 .maxlen = sizeof(int),
4929 .mode = 0644,
4930 .proc_handler = proc_dointvec
4931 },
1da177e4 4932 {
f8572d8f 4933 /* sentinel */
1da177e4
LT		 4934 }
4935 },
1da177e4
LT		 4936};
4937
bff16c2f 4938static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4939 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4940{
4941 int i;
1da177e4 4942 struct addrconf_sysctl_table *t;
6105e293 4943 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 4944
af879cc7 4945 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4946 if (t == NULL)
f68635e6
PE		 4947 goto out;
4948
bcdd553f 4949 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 4950 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 4951 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4952 t->addrconf_vars[i].extra2 = net;
1da177e4 4953 }
1da177e4 4954
6105e293 4955 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 4956
6105e293 4957 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
1da177e4 4958 if (t->sysctl_header == NULL)
6105e293 4959 goto free;
f68635e6
PE		 4960
4961 p->sysctl = t;
95897312 4962 return 0;
1da177e4 4963
f68635e6 4964free:
1da177e4 4965 kfree(t);
f68635e6 4966out:
95897312 4967 return -ENOBUFS;
1da177e4
LT		 4968}
4969
408c4768
PE		 4970static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4971{
4972 struct addrconf_sysctl_table *t;
4973
4974 if (p->sysctl == NULL)
4975 return;
4976
4977 t = p->sysctl;
4978 p->sysctl = NULL;
ff538818 4979 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 4980 kfree(t);
4981}
4982
f52295a9
PE		 4983static void addrconf_sysctl_register(struct inet6_dev *idev)
4984{
54716e3b 4985 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 4986 &ndisc_ifinfo_sysctl_change);
c346dca1 4987 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 4988 idev, &idev->cnf);
f52295a9
PE		 4989}
4990
408c4768 4991static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4992{
408c4768
PE		 4993 __addrconf_sysctl_unregister(&idev->cnf);
4994 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4995}
4996
4997
4998#endif
4999
2c8c1e72 5000static int __net_init addrconf_init_net(struct net *net)
e0da5a48 5001{
a79ca223 5002 int err = -ENOMEM;
e0da5a48
PE		 5003 struct ipv6_devconf *all, *dflt;
5004
a79ca223
HZ		 5005 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5006 if (all == NULL)
5007 goto err_alloc_all;
e0da5a48 5008
a79ca223
HZ		 5009 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5010 if (dflt == NULL)
5011 goto err_alloc_dflt;
e0da5a48 5012
a79ca223
HZ		 5013 /* these will be inherited by all namespaces */
5014 dflt->autoconf = ipv6_defaults.autoconf;
5015 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 5016
5017 net->ipv6.devconf_all = all;
5018 net->ipv6.devconf_dflt = dflt;
5019
5020#ifdef CONFIG_SYSCTL
f8572d8f 5021 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 5022 if (err < 0)
5023 goto err_reg_all;
5024
f8572d8f 5025 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 5026 if (err < 0)
5027 goto err_reg_dflt;
5028#endif
5029 return 0;
5030
5031#ifdef CONFIG_SYSCTL
5032err_reg_dflt:
5033 __addrconf_sysctl_unregister(all);
5034err_reg_all:
5035 kfree(dflt);
5036#endif
5037err_alloc_dflt:
5038 kfree(all);
5039err_alloc_all:
5040 return err;
5041}
5042
2c8c1e72 5043static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 5044{
5045#ifdef CONFIG_SYSCTL
5046 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5047 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5048#endif
09ad9bc7 5049 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 5050 kfree(net->ipv6.devconf_dflt);
5051 kfree(net->ipv6.devconf_all);
5052 }
5053}
5054
5055static struct pernet_operations addrconf_ops = {
5056 .init = addrconf_init_net,
5057 .exit = addrconf_exit_net,
5058};
5059
b382b191
TG		 5060static struct rtnl_af_ops inet6_ops = {
5061 .family = AF_INET6,
5062 .fill_link_af = inet6_fill_link_af,
5063 .get_link_af_size = inet6_get_link_af_size,
f53adae4 5064 .set_link_af = inet6_set_link_af,
b382b191
TG		 5065};
5066
1da177e4
LT		 5067/*
5068 * Init / cleanup code
5069 */
5070
5071int __init addrconf_init(void)
5072{
c2e21293 5073 int i, err;
2a8cc6c8 5074
e21e8467
SH		 5075 err = ipv6_addr_label_init();
5076 if (err < 0) {
f3213831
JP		 5077 pr_crit("%s: cannot initialize default policy table: %d\n",
5078 __func__, err);
2cc6d2bf 5079 goto out;
2a8cc6c8 5080 }
1da177e4 5081
2cc6d2bf
NH		 5082 err = register_pernet_subsys(&addrconf_ops);
5083 if (err < 0)
5084 goto out_addrlabel;
e0da5a48 5085
1da177e4
LT		 5086 /* The addrconf netdev notifier requires that loopback_dev
5087 * has it's ipv6 private information allocated and setup
5088 * before it can bring up and give link-local addresses
5089 * to other devices which are up.
5090 *
5091 * Unfortunately, loopback_dev is not necessarily the first
5092 * entry in the global dev_base list of net devices. In fact,
5093 * it is likely to be the very last entry on that list.
5094 * So this causes the notifier registry below to try and
5095 * give link-local addresses to all devices besides loopback_dev
5096 * first, then loopback_dev, which cases all the non-loopback_dev
5097 * devices to fail to get a link-local address.
5098 *
5099 * So, as a temporary fix, allocate the ipv6 structure for
5100 * loopback_dev first by hand.
5101 * Longer term, all of the dependencies ipv6 has upon the loopback
5102 * device and it being up should be removed.
5103 */
5104 rtnl_lock();
2774c7ab 5105 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 5106 err = -ENOMEM;
5107 rtnl_unlock();
5108 if (err)
e0da5a48 5109 goto errlo;
1da177e4 5110
c2e21293 5111 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5112 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5113
1da177e4
LT		 5114 register_netdevice_notifier(&ipv6_dev_notf);
5115
1da177e4 5116 addrconf_verify(0);
c127ea2c 5117
b382b191
TG		 5118 err = rtnl_af_register(&inet6_ops);
5119 if (err < 0)
5120 goto errout_af;
5121
c7ac8679
GR		 5122 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5123 NULL);
c127ea2c
TG		 5124 if (err < 0)
5125 goto errout;
5126
5127 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 5128 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5129 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5130 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5131 inet6_dump_ifaddr, NULL);
5132 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5133 inet6_dump_ifmcaddr, NULL);
5134 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5135 inet6_dump_ifacaddr, NULL);
76f8f6cb 5136 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 5137 inet6_netconf_dump_devconf, NULL);
c127ea2c 5138
2a8cc6c8
YH		 5139 ipv6_addr_label_rtnl_register();
5140
1da177e4 5141 return 0;
c127ea2c 5142errout:
b382b191
TG		 5143 rtnl_af_unregister(&inet6_ops);
5144errout_af:
c127ea2c 5145 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 5146errlo:
5147 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 5148out_addrlabel:
5149 ipv6_addr_label_cleanup();
5150out:
c127ea2c 5151 return err;
1da177e4
LT		 5152}
5153
09f7709f 5154void addrconf_cleanup(void)
1da177e4 5155{
176c39af 5156 struct net_device *dev;
1da177e4
LT		 5157 int i;
5158
5159 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5160 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 5161 ipv6_addr_label_cleanup();
1da177e4
LT		 5162
5163 rtnl_lock();
5164
b382b191
TG		 5165 __rtnl_af_unregister(&inet6_ops);
5166
176c39af
DL		 5167 /* clean dev list */
5168 for_each_netdev(&init_net, dev) {
5169 if (__in6_dev_get(dev) == NULL)
5170 continue;
5171 addrconf_ifdown(dev, 1);
5172 }
5173 addrconf_ifdown(init_net.loopback_dev, 2);
5174
1da177e4
LT		 5175 /*
5176 * Check hash table.
5177 */
5c578aed 5178 spin_lock_bh(&addrconf_hash_lock);
c2e21293 5179 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5180 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 5181 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 5182
5183 del_timer(&addr_chk_timer);
1da177e4 5184 rtnl_unlock();
1da177e4 5185}
kernel source for telekom puls (alcatel/mediatek)