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Merge branch 'acpi-lpss'
[deliverable/linux.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
1da177e4
LT		 46#include <linux/socket.h>
47#include <linux/sockios.h>
1da177e4
LT		 48#include <linux/net.h>
49#include <linux/in6.h>
50#include <linux/netdevice.h>
1823730f 51#include <linux/if_addr.h>
1da177e4
LT		 52#include <linux/if_arp.h>
53#include <linux/if_arcnet.h>
54#include <linux/if_infiniband.h>
55#include <linux/route.h>
56#include <linux/inetdevice.h>
57#include <linux/init.h>
5a0e3ad6 58#include <linux/slab.h>
1da177e4
LT		 59#ifdef CONFIG_SYSCTL
60#include <linux/sysctl.h>
61#endif
4fc268d2 62#include <linux/capability.h>
1da177e4
LT		 63#include <linux/delay.h>
64#include <linux/notifier.h>
543537bd 65#include <linux/string.h>
ddbe5032 66#include <linux/hash.h>
1da177e4 67
457c4cbc 68#include <net/net_namespace.h>
1da177e4
LT		 69#include <net/sock.h>
70#include <net/snmp.h>
71
06a4c1c5 72#include <net/af_ieee802154.h>
1da177e4
LT		 73#include <net/ipv6.h>
74#include <net/protocol.h>
75#include <net/ndisc.h>
76#include <net/ip6_route.h>
77#include <net/addrconf.h>
78#include <net/tcp.h>
79#include <net/ip.h>
5d620266 80#include <net/netlink.h>
f24e3d65 81#include <net/pkt_sched.h>
1da177e4
LT		 82#include <linux/if_tunnel.h>
83#include <linux/rtnetlink.h>
f3a1bfb1 84#include <linux/netconf.h>
1da177e4
LT		 85
86#ifdef CONFIG_IPV6_PRIVACY
87#include <linux/random.h>
1da177e4
LT		 88#endif
89
e21e8467 90#include <linux/uaccess.h>
7f7d9a6b 91#include <asm/unaligned.h>
1da177e4
LT		 92
93#include <linux/proc_fs.h>
94#include <linux/seq_file.h>
bc3b2d7f 95#include <linux/export.h>
1da177e4
LT		 96
97/* Set to 3 to get tracing... */
98#define ACONF_DEBUG 2
99
100#if ACONF_DEBUG >= 3
101#define ADBG(x) printk x
102#else
103#define ADBG(x)
104#endif
105
106#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e
TG		 107
108static inline u32 cstamp_delta(unsigned long cstamp)
109{
110 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
111}
1da177e4
LT		 112
113#ifdef CONFIG_SYSCTL
f52295a9 114static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 115static void addrconf_sysctl_unregister(struct inet6_dev *idev);
116#else
117static inline void addrconf_sysctl_register(struct inet6_dev *idev)
118{
119}
120
121static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
122{
123}
1da177e4
LT		 124#endif
125
126#ifdef CONFIG_IPV6_PRIVACY
eb7e0575
SD		 127static void __ipv6_regen_rndid(struct inet6_dev *idev);
128static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 129static void ipv6_regen_rndid(unsigned long data);
1da177e4
LT		 130#endif
131
1b34be74 132static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 133static int ipv6_count_addresses(struct inet6_dev *idev);
134
135/*
136 * Configured unicast address hash table
137 */
c2e21293 138static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 139static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 140
1da177e4
LT		 141static void addrconf_verify(unsigned long);
142
8d06afab 143static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 144static DEFINE_SPINLOCK(addrconf_verify_lock);
145
146static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
147static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
148
93d9b7d7
JP		 149static void addrconf_type_change(struct net_device *dev,
150 unsigned long event);
1da177e4
LT		 151static int addrconf_ifdown(struct net_device *dev, int how);
152
21caa662
RK		 153static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
154 int plen,
155 const struct net_device *dev,
156 u32 flags, u32 noflags);
157
cf22f9a2 158static void addrconf_dad_start(struct inet6_ifaddr *ifp);
1da177e4
LT		 159static void addrconf_dad_timer(unsigned long data);
160static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 161static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 162static void addrconf_rs_timer(unsigned long data);
163static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
164static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
165
1ab1457c 166static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 167 struct prefix_info *pinfo);
3e81c6da
DM		 168static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
169 struct net_device *dev);
1da177e4 170
888c848e 171static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 172 .forwarding = 0,
173 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
174 .mtu6 = IPV6_MIN_MTU,
175 .accept_ra = 1,
176 .accept_redirects = 1,
177 .autoconf = 1,
178 .force_mld_version = 0,
179 .dad_transmits = 1,
180 .rtr_solicits = MAX_RTR_SOLICITATIONS,
181 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
182 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
183#ifdef CONFIG_IPV6_PRIVACY
184 .use_tempaddr = 0,
185 .temp_valid_lft = TEMP_VALID_LIFETIME,
186 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
187 .regen_max_retry = REGEN_MAX_RETRY,
188 .max_desync_factor = MAX_DESYNC_FACTOR,
189#endif
190 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 191 .accept_ra_defrtr = 1,
c4fd30eb 192 .accept_ra_pinfo = 1,
930d6ff2
YH		 193#ifdef CONFIG_IPV6_ROUTER_PREF
194 .accept_ra_rtr_pref = 1,
52e16356 195 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 196#ifdef CONFIG_IPV6_ROUTE_INFO
197 .accept_ra_rt_info_max_plen = 0,
198#endif
930d6ff2 199#endif
fbea49e1 200 .proxy_ndp = 0,
0bcbc926 201 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 202 .disable_ipv6 = 0,
1b34be74 203 .accept_dad = 1,
1da177e4
LT		 204};
205
ab32ea5d 206static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 207 .forwarding = 0,
208 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
209 .mtu6 = IPV6_MIN_MTU,
210 .accept_ra = 1,
211 .accept_redirects = 1,
212 .autoconf = 1,
213 .dad_transmits = 1,
214 .rtr_solicits = MAX_RTR_SOLICITATIONS,
215 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
216 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
217#ifdef CONFIG_IPV6_PRIVACY
218 .use_tempaddr = 0,
219 .temp_valid_lft = TEMP_VALID_LIFETIME,
220 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
221 .regen_max_retry = REGEN_MAX_RETRY,
222 .max_desync_factor = MAX_DESYNC_FACTOR,
223#endif
224 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 225 .accept_ra_defrtr = 1,
c4fd30eb 226 .accept_ra_pinfo = 1,
930d6ff2
YH		 227#ifdef CONFIG_IPV6_ROUTER_PREF
228 .accept_ra_rtr_pref = 1,
52e16356 229 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 230#ifdef CONFIG_IPV6_ROUTE_INFO
231 .accept_ra_rt_info_max_plen = 0,
232#endif
930d6ff2 233#endif
fbea49e1 234 .proxy_ndp = 0,
0bcbc926 235 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 236 .disable_ipv6 = 0,
1b34be74 237 .accept_dad = 1,
1da177e4
LT		 238};
239
240/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 241const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4 242const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
f3ee4010
YH		 243const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
244const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
2c5e8933
HFS		 245const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
246const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
247const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
1da177e4 248
f24e3d65 249/* Check if a valid qdisc is available */
05297949 250static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 251{
05297949 252 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 253}
254
1da177e4
LT		 255static void addrconf_del_timer(struct inet6_ifaddr *ifp)
256{
257 if (del_timer(&ifp->timer))
258 __in6_ifa_put(ifp);
259}
260
e21e8467 261enum addrconf_timer_t {
1da177e4
LT		 262 AC_NONE,
263 AC_DAD,
264 AC_RS,
265};
266
267static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
268 enum addrconf_timer_t what,
269 unsigned long when)
270{
271 if (!del_timer(&ifp->timer))
272 in6_ifa_hold(ifp);
273
274 switch (what) {
275 case AC_DAD:
276 ifp->timer.function = addrconf_dad_timer;
277 break;
278 case AC_RS:
279 ifp->timer.function = addrconf_rs_timer;
280 break;
e21e8467
SH		 281 default:
282 break;
1da177e4
LT		 283 }
284 ifp->timer.expires = jiffies + when;
285 add_timer(&ifp->timer);
286}
287
7f7d9a6b
HX		 288static int snmp6_alloc_dev(struct inet6_dev *idev)
289{
7d720c3e 290 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
1823e4c8
ED		 291 sizeof(struct ipstats_mib),
292 __alignof__(struct ipstats_mib)) < 0)
7f7d9a6b 293 goto err_ip;
be281e55
ED		 294 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
295 GFP_KERNEL);
296 if (!idev->stats.icmpv6dev)
7f7d9a6b 297 goto err_icmp;
be281e55
ED		 298 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
299 GFP_KERNEL);
300 if (!idev->stats.icmpv6msgdev)
14878f75 301 goto err_icmpmsg;
7f7d9a6b
HX		 302
303 return 0;
304
14878f75 305err_icmpmsg:
be281e55 306 kfree(idev->stats.icmpv6dev);
7f7d9a6b 307err_icmp:
7d720c3e 308 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b 309err_ip:
aaf70ec7 310 return -ENOMEM;
7f7d9a6b
HX		 311}
312
16910b98 313static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 314{
be281e55
ED		 315 kfree(idev->stats.icmpv6msgdev);
316 kfree(idev->stats.icmpv6dev);
7d720c3e 317 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b
HX		 318}
319
1da177e4
LT		 320/* Nobody refers to this device, we may destroy it. */
321
322void in6_dev_finish_destroy(struct inet6_dev *idev)
323{
324 struct net_device *dev = idev->dev;
547b792c 325
502a2ffd 326 WARN_ON(!list_empty(&idev->addr_list));
547b792c
IJ		 327 WARN_ON(idev->mc_list != NULL);
328
1da177e4 329#ifdef NET_REFCNT_DEBUG
91df42be 330 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
1da177e4
LT		 331#endif
332 dev_put(dev);
333 if (!idev->dead) {
f3213831 334 pr_warn("Freeing alive inet6 device %p\n", idev);
1da177e4
LT		 335 return;
336 }
337 snmp6_free_dev(idev);
38f57d1a 338 kfree_rcu(idev, rcu);
1da177e4 339}
7159039a
YH		 340EXPORT_SYMBOL(in6_dev_finish_destroy);
341
8e5e8f30 342static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 343{
344 struct inet6_dev *ndev;
345
346 ASSERT_RTNL();
347
348 if (dev->mtu < IPV6_MIN_MTU)
349 return NULL;
350
1ab1457c 351 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 352
1ab1457c
YH		 353 if (ndev == NULL)
354 return NULL;
322f74a4
IO		 355
356 rwlock_init(&ndev->lock);
357 ndev->dev = dev;
502a2ffd 358 INIT_LIST_HEAD(&ndev->addr_list);
359
c346dca1 360 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 361 ndev->cnf.mtu6 = dev->mtu;
362 ndev->cnf.sysctl = NULL;
363 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
364 if (ndev->nd_parms == NULL) {
365 kfree(ndev);
366 return NULL;
367 }
0187bdfb
BH		 368 if (ndev->cnf.forwarding)
369 dev_disable_lro(dev);
322f74a4
IO		 370 /* We refer to the device */
371 dev_hold(dev);
1da177e4 372
322f74a4
IO		 373 if (snmp6_alloc_dev(ndev) < 0) {
374 ADBG((KERN_WARNING
f3213831 375 "%s: cannot allocate memory for statistics; dev=%s.\n",
0dc47877 376 __func__, dev->name));
322f74a4 377 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 378 dev_put(dev);
379 kfree(ndev);
322f74a4
IO		 380 return NULL;
381 }
1da177e4 382
322f74a4
IO		 383 if (snmp6_register_dev(ndev) < 0) {
384 ADBG((KERN_WARNING
f3213831 385 "%s: cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 386 __func__, dev->name));
322f74a4
IO		 387 neigh_parms_release(&nd_tbl, ndev->nd_parms);
388 ndev->dead = 1;
389 in6_dev_finish_destroy(ndev);
390 return NULL;
391 }
392
393 /* One reference from device. We must do this before
394 * we invoke __ipv6_regen_rndid().
395 */
396 in6_dev_hold(ndev);
1da177e4 397
1b34be74
YH		 398 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
399 ndev->cnf.accept_dad = -1;
400
07a93626 401#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 402 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 403 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 404 ndev->cnf.rtr_solicits = 0;
405 }
406#endif
407
1da177e4 408#ifdef CONFIG_IPV6_PRIVACY
372e6c8f 409 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 410 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 411 if ((dev->flags&IFF_LOOPBACK) ||
412 dev->type == ARPHRD_TUNNEL ||
9625ed72 413 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 414 dev->type == ARPHRD_SIT ||
0be669bb 415 dev->type == ARPHRD_NONE) {
322f74a4
IO		 416 ndev->cnf.use_tempaddr = -1;
417 } else {
418 in6_dev_hold(ndev);
419 ipv6_regen_rndid((unsigned long) ndev);
420 }
1da177e4
LT		 421#endif
422
f24e3d65 423 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 424 ndev->if_flags |= IF_READY;
425
322f74a4
IO		 426 ipv6_mc_init_dev(ndev);
427 ndev->tstamp = jiffies;
f52295a9 428 addrconf_sysctl_register(ndev);
30c4cf57 429 /* protected by rtnl_lock */
cf778b00 430 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 431
2c5e8933
HFS		 432 /* Join interface-local all-node multicast group */
433 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
434
d88ae4cc 435 /* Join all-node multicast group */
f3ee4010 436 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 437
d6ddef9e 438 /* Join all-router multicast group if forwarding is set */
8b2aaede 439 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 440 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
441
1da177e4
LT		 442 return ndev;
443}
444
8e5e8f30 445static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 446{
447 struct inet6_dev *idev;
448
449 ASSERT_RTNL();
450
e21e8467
SH		 451 idev = __in6_dev_get(dev);
452 if (!idev) {
453 idev = ipv6_add_dev(dev);
454 if (!idev)
1da177e4
LT		 455 return NULL;
456 }
c5e33bdd 457
1da177e4
LT		 458 if (dev->flags&IFF_UP)
459 ipv6_mc_up(idev);
460 return idev;
461}
462
f3a1bfb1
ND		 463static int inet6_netconf_msgsize_devconf(int type)
464{
465 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
466 + nla_total_size(4); /* NETCONFA_IFINDEX */
467
76f8f6cb
ND		 468 /* type -1 is used for ALL */
469 if (type == -1 || type == NETCONFA_FORWARDING)
f3a1bfb1 470 size += nla_total_size(4);
b1afce95 471#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 472 if (type == -1 || type == NETCONFA_MC_FORWARDING)
473 size += nla_total_size(4);
b1afce95 474#endif
f3a1bfb1
ND		 475
476 return size;
477}
478
479static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
480 struct ipv6_devconf *devconf, u32 portid,
481 u32 seq, int event, unsigned int flags,
482 int type)
483{
484 struct nlmsghdr *nlh;
485 struct netconfmsg *ncm;
486
487 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
488 flags);
489 if (nlh == NULL)
490 return -EMSGSIZE;
491
492 ncm = nlmsg_data(nlh);
493 ncm->ncm_family = AF_INET6;
494
495 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
496 goto nla_put_failure;
497
76f8f6cb
ND		 498 /* type -1 is used for ALL */
499 if ((type == -1 || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 500 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
501 goto nla_put_failure;
b1afce95 502#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 503 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
504 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
505 devconf->mc_forwarding) < 0)
506 goto nla_put_failure;
b1afce95 507#endif
f3a1bfb1
ND		 508 return nlmsg_end(skb, nlh);
509
510nla_put_failure:
511 nlmsg_cancel(skb, nlh);
512 return -EMSGSIZE;
513}
514
d67b8c61
ND		 515void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
516 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 517{
518 struct sk_buff *skb;
519 int err = -ENOBUFS;
520
521 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
522 if (skb == NULL)
523 goto errout;
524
525 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
526 RTM_NEWNETCONF, 0, type);
527 if (err < 0) {
528 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
529 WARN_ON(err == -EMSGSIZE);
530 kfree_skb(skb);
531 goto errout;
532 }
533 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
534 return;
535errout:
bd779028 536 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 537}
538
76f8f6cb
ND		 539static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
540 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
541 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
542};
543
544static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
545 struct nlmsghdr *nlh,
546 void *arg)
547{
548 struct net *net = sock_net(in_skb->sk);
549 struct nlattr *tb[NETCONFA_MAX+1];
550 struct netconfmsg *ncm;
551 struct sk_buff *skb;
552 struct ipv6_devconf *devconf;
553 struct inet6_dev *in6_dev;
554 struct net_device *dev;
555 int ifindex;
556 int err;
557
558 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
559 devconf_ipv6_policy);
560 if (err < 0)
561 goto errout;
562
563 err = EINVAL;
564 if (!tb[NETCONFA_IFINDEX])
565 goto errout;
566
567 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
568 switch (ifindex) {
569 case NETCONFA_IFINDEX_ALL:
570 devconf = net->ipv6.devconf_all;
571 break;
572 case NETCONFA_IFINDEX_DEFAULT:
573 devconf = net->ipv6.devconf_dflt;
574 break;
575 default:
576 dev = __dev_get_by_index(net, ifindex);
577 if (dev == NULL)
578 goto errout;
579 in6_dev = __in6_dev_get(dev);
580 if (in6_dev == NULL)
581 goto errout;
582 devconf = &in6_dev->cnf;
583 break;
584 }
585
586 err = -ENOBUFS;
587 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
588 if (skb == NULL)
589 goto errout;
590
591 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
592 NETLINK_CB(in_skb).portid,
593 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
594 -1);
595 if (err < 0) {
596 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
597 WARN_ON(err == -EMSGSIZE);
598 kfree_skb(skb);
599 goto errout;
600 }
601 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
602errout:
603 return err;
604}
605
1da177e4
LT		 606#ifdef CONFIG_SYSCTL
607static void dev_forward_change(struct inet6_dev *idev)
608{
609 struct net_device *dev;
610 struct inet6_ifaddr *ifa;
1da177e4
LT		 611
612 if (!idev)
613 return;
614 dev = idev->dev;
0187bdfb
BH		 615 if (idev->cnf.forwarding)
616 dev_disable_lro(dev);
1a940835 617 if (dev->flags & IFF_MULTICAST) {
2c5e8933 618 if (idev->cnf.forwarding) {
f3ee4010 619 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 620 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
621 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
622 } else {
f3ee4010 623 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 624 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
625 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
626 }
1da177e4 627 }
502a2ffd 628
629 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 630 if (ifa->flags&IFA_F_TENTATIVE)
631 continue;
1da177e4
LT		 632 if (idev->cnf.forwarding)
633 addrconf_join_anycast(ifa);
634 else
635 addrconf_leave_anycast(ifa);
636 }
f3a1bfb1
ND		 637 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
638 dev->ifindex, &idev->cnf);
1da177e4
LT		 639}
640
641
e186932b 642static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 643{
644 struct net_device *dev;
645 struct inet6_dev *idev;
646
4acd4945 647 for_each_netdev(net, dev) {
1da177e4
LT		 648 idev = __in6_dev_get(dev);
649 if (idev) {
e186932b
PE		 650 int changed = (!idev->cnf.forwarding) ^ (!newf);
651 idev->cnf.forwarding = newf;
1da177e4
LT		 652 if (changed)
653 dev_forward_change(idev);
654 }
1da177e4 655 }
1da177e4 656}
c8fecf22 657
013d97e9 658static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 659{
bff16c2f 660 struct net *net;
013d97e9
FR		 661 int old;
662
663 if (!rtnl_trylock())
664 return restart_syscall();
bff16c2f
PE		 665
666 net = (struct net *)table->extra2;
013d97e9
FR		 667 old = *p;
668 *p = newf;
b325fddb 669
013d97e9 670 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 671 if ((!newf) ^ (!old))
672 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
673 NETCONFA_IFINDEX_DEFAULT,
674 net->ipv6.devconf_dflt);
013d97e9
FR		 675 rtnl_unlock();
676 return 0;
88af182e 677 }
c8fecf22 678
e186932b 679 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 680 net->ipv6.devconf_dflt->forwarding = newf;
681 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 682 if ((!newf) ^ (!old))
683 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
684 NETCONFA_IFINDEX_ALL,
685 net->ipv6.devconf_all);
013d97e9 686 } else if ((!newf) ^ (!old))
c8fecf22 687 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 688 rtnl_unlock();
c8fecf22 689
013d97e9 690 if (newf)
7b4da532 691 rt6_purge_dflt_routers(net);
b325fddb 692 return 1;
c8fecf22 693}
1da177e4
LT		 694#endif
695
5c578aed 696/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 697void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
698{
c2e21293 699 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 700
1da177e4 701#ifdef NET_REFCNT_DEBUG
91df42be 702 pr_debug("%s\n", __func__);
1da177e4
LT		 703#endif
704
705 in6_dev_put(ifp->idev);
706
707 if (del_timer(&ifp->timer))
e21e8467 708 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
1da177e4 709
e9d3e084 710 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 711 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 712 return;
713 }
94e187c0 714 ip6_rt_put(ifp->rt);
1da177e4 715
e5785985 716 kfree_rcu(ifp, rcu);
1da177e4
LT		 717}
718
e55ffac6
BH		 719static void
720ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
721{
502a2ffd 722 struct list_head *p;
8a6ce0c0 723 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 724
725 /*
726 * Each device address list is sorted in order of scope -
727 * global before linklocal.
728 */
502a2ffd 729 list_for_each(p, &idev->addr_list) {
730 struct inet6_ifaddr *ifa
731 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 732 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 733 break;
734 }
735
b54c9b98 736 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 737}
738
ddbe5032 739static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 740{
ddbe5032 741 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 742}
743
1da177e4
LT		 744/* On success it returns ifp with increased reference count */
745
746static struct inet6_ifaddr *
747ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 748 int scope, u32 flags)
1da177e4
LT		 749{
750 struct inet6_ifaddr *ifa = NULL;
751 struct rt6_info *rt;
3a88a81d 752 unsigned int hash;
1da177e4 753 int err = 0;
d68b8270
YH		 754 int addr_type = ipv6_addr_type(addr);
755
756 if (addr_type == IPV6_ADDR_ANY ||
757 addr_type & IPV6_ADDR_MULTICAST ||
758 (!(idev->dev->flags & IFF_LOOPBACK) &&
759 addr_type & IPV6_ADDR_LOOPBACK))
760 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 761
8814c4b5 762 rcu_read_lock_bh();
1da177e4
LT		 763 if (idev->dead) {
764 err = -ENODEV; /*XXX*/
765 goto out2;
766 }
767
56d417b1 768 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 769 err = -EACCES;
770 goto out2;
771 }
772
5c578aed 773 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 774
775 /* Ignore adding duplicate addresses on an interface */
c346dca1 776 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 777 ADBG(("ipv6_add_addr: already assigned\n"));
778 err = -EEXIST;
779 goto out;
780 }
781
322f74a4 782 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 783
784 if (ifa == NULL) {
785 ADBG(("ipv6_add_addr: malloc failed\n"));
786 err = -ENOBUFS;
787 goto out;
788 }
789
8f031519 790 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 791 if (IS_ERR(rt)) {
792 err = PTR_ERR(rt);
793 goto out;
794 }
795
4e3fd7a0 796 ifa->addr = *addr;
1da177e4
LT		 797
798 spin_lock_init(&ifa->lock);
e9d3e084 799 spin_lock_init(&ifa->state_lock);
1da177e4 800 init_timer(&ifa->timer);
c2e21293 801 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 802 ifa->timer.data = (unsigned long) ifa;
803 ifa->scope = scope;
804 ifa->prefix_len = pfxlen;
805 ifa->flags = flags | IFA_F_TENTATIVE;
806 ifa->cstamp = ifa->tstamp = jiffies;
807
57f5f544
KF		 808 ifa->rt = rt;
809
1da177e4
LT		 810 ifa->idev = idev;
811 in6_dev_hold(idev);
812 /* For caller */
813 in6_ifa_hold(ifa);
814
815 /* Add to big hash table */
ddbe5032 816 hash = inet6_addr_hash(addr);
1da177e4 817
5c578aed 818 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 819 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 820
821 write_lock(&idev->lock);
822 /* Add to inet6_dev unicast addr list. */
e55ffac6 823 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 824
825#ifdef CONFIG_IPV6_PRIVACY
826 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 827 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 828 in6_ifa_hold(ifa);
829 }
830#endif
831
1da177e4
LT		 832 in6_ifa_hold(ifa);
833 write_unlock(&idev->lock);
834out2:
8814c4b5 835 rcu_read_unlock_bh();
1da177e4 836
fd92833a 837 if (likely(err == 0))
f88c91dd 838 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 839 else {
840 kfree(ifa);
841 ifa = ERR_PTR(err);
842 }
843
844 return ifa;
845out:
5c578aed 846 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 847 goto out2;
848}
849
850/* This function wants to get referenced ifp and releases it before return */
851
852static void ipv6_del_addr(struct inet6_ifaddr *ifp)
853{
502a2ffd 854 struct inet6_ifaddr *ifa, *ifn;
1da177e4 855 struct inet6_dev *idev = ifp->idev;
4c5ff6a6 856 int state;
1da177e4
LT		 857 int deleted = 0, onlink = 0;
858 unsigned long expires = jiffies;
859
4c5ff6a6
HX		 860 spin_lock_bh(&ifp->state_lock);
861 state = ifp->state;
e9d3e084 862 ifp->state = INET6_IFADDR_STATE_DEAD;
4c5ff6a6
HX		 863 spin_unlock_bh(&ifp->state_lock);
864
865 if (state == INET6_IFADDR_STATE_DEAD)
866 goto out;
1da177e4 867
5c578aed 868 spin_lock_bh(&addrconf_hash_lock);
869 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 870 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 871
872 write_lock_bh(&idev->lock);
873#ifdef CONFIG_IPV6_PRIVACY
874 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 875 list_del(&ifp->tmp_list);
876 if (ifp->ifpub) {
877 in6_ifa_put(ifp->ifpub);
878 ifp->ifpub = NULL;
1da177e4 879 }
372e6c8f 880 __in6_ifa_put(ifp);
1da177e4
LT		 881 }
882#endif
883
502a2ffd 884 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
1da177e4 885 if (ifa == ifp) {
502a2ffd 886 list_del_init(&ifp->if_list);
1da177e4 887 __in6_ifa_put(ifp);
502a2ffd 888
1da177e4
LT		 889 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
890 break;
891 deleted = 1;
1d142804 892 continue;
1da177e4
LT		 893 } else if (ifp->flags & IFA_F_PERMANENT) {
894 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
895 ifp->prefix_len)) {
896 if (ifa->flags & IFA_F_PERMANENT) {
897 onlink = 1;
898 if (deleted)
899 break;
900 } else {
901 unsigned long lifetime;
902
903 if (!onlink)
904 onlink = -1;
905
906 spin_lock(&ifa->lock);
4bed72e4
YH		 907
908 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
909 /*
910 * Note: Because this address is
911 * not permanent, lifetime <
912 * LONG_MAX / HZ here.
913 */
1da177e4
LT		 914 if (time_before(expires,
915 ifa->tstamp + lifetime * HZ))
916 expires = ifa->tstamp + lifetime * HZ;
917 spin_unlock(&ifa->lock);
918 }
919 }
920 }
921 }
922 write_unlock_bh(&idev->lock);
923
b2238566
AV		 924 addrconf_del_timer(ifp);
925
1da177e4
LT		 926 ipv6_ifa_notify(RTM_DELADDR, ifp);
927
f88c91dd 928 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 929
1da177e4
LT		 930 /*
931 * Purge or update corresponding prefix
932 *
933 * 1) we don't purge prefix here if address was not permanent.
934 * prefix is managed by its own lifetime.
935 * 2) if there're no addresses, delete prefix.
936 * 3) if there're still other permanent address(es),
937 * corresponding prefix is still permanent.
938 * 4) otherwise, update prefix lifetime to the
939 * longest valid lifetime among the corresponding
940 * addresses on the device.
941 * Note: subsequent RA will update lifetime.
942 *
943 * --yoshfuji
944 */
945 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
946 struct in6_addr prefix;
947 struct rt6_info *rt;
64c6d08e 948
1da177e4 949 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
1da177e4 950
21caa662
RK		 951 rt = addrconf_get_prefix_route(&prefix,
952 ifp->prefix_len,
953 ifp->idev->dev,
954 0, RTF_GATEWAY | RTF_DEFAULT);
955
956 if (rt) {
1da177e4 957 if (onlink == 0) {
e0a1ad73 958 ip6_del_rt(rt);
1da177e4
LT		 959 rt = NULL;
960 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1716a961 961 rt6_set_expires(rt, expires);
1da177e4
LT		 962 }
963 }
94e187c0 964 ip6_rt_put(rt);
1da177e4
LT		 965 }
966
c3968a85
DW		 967 /* clean up prefsrc entries */
968 rt6_remove_prefsrc(ifp);
4c5ff6a6 969out:
1da177e4
LT		 970 in6_ifa_put(ifp);
971}
972
973#ifdef CONFIG_IPV6_PRIVACY
974static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
975{
976 struct inet6_dev *idev = ifp->idev;
977 struct in6_addr addr, *tmpaddr;
76f793e3 978 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 979 unsigned long regen_advance;
1da177e4
LT		 980 int tmp_plen;
981 int ret = 0;
982 int max_addresses;
95c385b4 983 u32 addr_flags;
76f793e3 984 unsigned long now = jiffies;
1da177e4
LT		 985
986 write_lock(&idev->lock);
987 if (ift) {
988 spin_lock_bh(&ift->lock);
989 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
990 spin_unlock_bh(&ift->lock);
991 tmpaddr = &addr;
992 } else {
993 tmpaddr = NULL;
994 }
995retry:
996 in6_dev_hold(idev);
997 if (idev->cnf.use_tempaddr <= 0) {
998 write_unlock(&idev->lock);
f3213831 999 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1000 in6_dev_put(idev);
1001 ret = -1;
1002 goto out;
1003 }
1004 spin_lock_bh(&ifp->lock);
1005 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1006 idev->cnf.use_tempaddr = -1; /*XXX*/
1007 spin_unlock_bh(&ifp->lock);
1008 write_unlock(&idev->lock);
f3213831
JP		 1009 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1010 __func__);
1da177e4
LT		 1011 in6_dev_put(idev);
1012 ret = -1;
1013 goto out;
1014 }
1015 in6_ifa_hold(ifp);
1016 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 1017 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1018 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1019 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 1020 tmp_valid_lft = min_t(__u32,
1021 ifp->valid_lft,
7a876b0e 1022 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 1023 tmp_prefered_lft = min_t(__u32,
1024 ifp->prefered_lft,
7a876b0e 1025 idev->cnf.temp_prefered_lft + age -
784e2710 1026 idev->cnf.max_desync_factor);
1da177e4
LT		 1027 tmp_plen = ifp->prefix_len;
1028 max_addresses = idev->cnf.max_addresses;
1da177e4
LT		 1029 tmp_tstamp = ifp->tstamp;
1030 spin_unlock_bh(&ifp->lock);
1031
eac55bf9
BB		 1032 regen_advance = idev->cnf.regen_max_retry *
1033 idev->cnf.dad_transmits *
1034 idev->nd_parms->retrans_time / HZ;
1da177e4 1035 write_unlock(&idev->lock);
95c385b4 1036
eac55bf9
BB		 1037 /* A temporary address is created only if this calculated Preferred
1038 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1039 * an implementation must not create a temporary address with a zero
1040 * Preferred Lifetime.
1041 */
1042 if (tmp_prefered_lft <= regen_advance) {
1043 in6_ifa_put(ifp);
1044 in6_dev_put(idev);
1045 ret = -1;
1046 goto out;
1047 }
1048
95c385b4
NH		 1049 addr_flags = IFA_F_TEMPORARY;
1050 /* set in addrconf_prefix_rcv() */
1051 if (ifp->flags & IFA_F_OPTIMISTIC)
1052 addr_flags |= IFA_F_OPTIMISTIC;
1053
1da177e4 1054 ift = !max_addresses ||
1ab1457c 1055 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 1056 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 1057 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
1058 addr_flags) : NULL;
3f0d2ba0 1059 if (IS_ERR_OR_NULL(ift)) {
1da177e4
LT		 1060 in6_ifa_put(ifp);
1061 in6_dev_put(idev);
f3213831 1062 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4
LT		 1063 tmpaddr = &addr;
1064 write_lock(&idev->lock);
1065 goto retry;
1066 }
1067
1068 spin_lock_bh(&ift->lock);
1069 ift->ifpub = ifp;
1070 ift->valid_lft = tmp_valid_lft;
1071 ift->prefered_lft = tmp_prefered_lft;
76f793e3 1072 ift->cstamp = now;
1da177e4
LT		 1073 ift->tstamp = tmp_tstamp;
1074 spin_unlock_bh(&ift->lock);
1075
cf22f9a2 1076 addrconf_dad_start(ift);
1da177e4
LT		 1077 in6_ifa_put(ift);
1078 in6_dev_put(idev);
1079out:
1080 return ret;
1081}
1082#endif
1083
1084/*
072047e4 1085 * Choose an appropriate source address (RFC3484)
1da177e4 1086 */
a9b05723
YH		 1087enum {
1088 IPV6_SADDR_RULE_INIT = 0,
1089 IPV6_SADDR_RULE_LOCAL,
1090 IPV6_SADDR_RULE_SCOPE,
1091 IPV6_SADDR_RULE_PREFERRED,
1092#ifdef CONFIG_IPV6_MIP6
1093 IPV6_SADDR_RULE_HOA,
1094#endif
1095 IPV6_SADDR_RULE_OIF,
1096 IPV6_SADDR_RULE_LABEL,
1097#ifdef CONFIG_IPV6_PRIVACY
1098 IPV6_SADDR_RULE_PRIVACY,
1099#endif
1100 IPV6_SADDR_RULE_ORCHID,
1101 IPV6_SADDR_RULE_PREFIX,
1102 IPV6_SADDR_RULE_MAX
1103};
1104
072047e4 1105struct ipv6_saddr_score {
a9b05723
YH		 1106 int rule;
1107 int addr_type;
1108 struct inet6_ifaddr *ifa;
1109 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1110 int scopedist;
1111 int matchlen;
072047e4
YH		 1112};
1113
a9b05723 1114struct ipv6_saddr_dst {
9acd9f3a 1115 const struct in6_addr *addr;
a9b05723
YH		 1116 int ifindex;
1117 int scope;
1118 int label;
7cbca67c 1119 unsigned int prefs;
a9b05723 1120};
072047e4 1121
b6f99a21 1122static inline int ipv6_saddr_preferred(int type)
1da177e4 1123{
45bb0060 1124 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1125 return 1;
1126 return 0;
1da177e4
LT		 1127}
1128
3de23255
BT		 1129static int ipv6_get_saddr_eval(struct net *net,
1130 struct ipv6_saddr_score *score,
a9b05723
YH		 1131 struct ipv6_saddr_dst *dst,
1132 int i)
1133{
1134 int ret;
1135
1136 if (i <= score->rule) {
1137 switch (i) {
1138 case IPV6_SADDR_RULE_SCOPE:
1139 ret = score->scopedist;
1140 break;
1141 case IPV6_SADDR_RULE_PREFIX:
1142 ret = score->matchlen;
1143 break;
1144 default:
1145 ret = !!test_bit(i, score->scorebits);
1146 }
1147 goto out;
1148 }
1149
1150 switch (i) {
1151 case IPV6_SADDR_RULE_INIT:
1152 /* Rule 0: remember if hiscore is not ready yet */
1153 ret = !!score->ifa;
1154 break;
1155 case IPV6_SADDR_RULE_LOCAL:
1156 /* Rule 1: Prefer same address */
1157 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1158 break;
1159 case IPV6_SADDR_RULE_SCOPE:
1160 /* Rule 2: Prefer appropriate scope
1161 *
1162 * ret
1163 * ^
1164 * -1 | d 15
1165 * ---+--+-+---> scope
1166 * |
1167 * | d is scope of the destination.
1168 * B-d | \
1169 * | \ <- smaller scope is better if
1170 * B-15 | \ if scope is enough for destinaion.
1171 * | ret = B - scope (-1 <= scope >= d <= 15).
1172 * d-C-1 | /
1173 * |/ <- greater is better
1174 * -C / if scope is not enough for destination.
1175 * /| ret = scope - C (-1 <= d < scope <= 15).
1176 *
1177 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1178 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1179 * Assume B = 0 and we get C > 29.
1180 */
1181 ret = __ipv6_addr_src_scope(score->addr_type);
1182 if (ret >= dst->scope)
1183 ret = -ret;
1184 else
1185 ret -= 128; /* 30 is enough */
1186 score->scopedist = ret;
1187 break;
1188 case IPV6_SADDR_RULE_PREFERRED:
1189 /* Rule 3: Avoid deprecated and optimistic addresses */
1190 ret = ipv6_saddr_preferred(score->addr_type) ||
1191 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1192 break;
1193#ifdef CONFIG_IPV6_MIP6
1194 case IPV6_SADDR_RULE_HOA:
7cbca67c 1195 {
a9b05723 1196 /* Rule 4: Prefer home address */
7cbca67c
YH		 1197 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1198 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1199 break;
7cbca67c 1200 }
a9b05723
YH		 1201#endif
1202 case IPV6_SADDR_RULE_OIF:
1203 /* Rule 5: Prefer outgoing interface */
1204 ret = (!dst->ifindex ||
1205 dst->ifindex == score->ifa->idev->dev->ifindex);
1206 break;
1207 case IPV6_SADDR_RULE_LABEL:
1208 /* Rule 6: Prefer matching label */
3de23255
BT		 1209 ret = ipv6_addr_label(net,
1210 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1211 score->ifa->idev->dev->ifindex) == dst->label;
1212 break;
1213#ifdef CONFIG_IPV6_PRIVACY
1214 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1215 {
a9b05723 1216 /* Rule 7: Prefer public address
25985edc 1217 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1218 */
7cbca67c
YH		 1219 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1220 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1221 score->ifa->idev->cnf.use_tempaddr >= 2;
1222 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1223 break;
7cbca67c 1224 }
a9b05723
YH		 1225#endif
1226 case IPV6_SADDR_RULE_ORCHID:
1227 /* Rule 8-: Prefer ORCHID vs ORCHID or
1228 * non-ORCHID vs non-ORCHID
1229 */
1230 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1231 ipv6_addr_orchid(dst->addr));
1232 break;
1233 case IPV6_SADDR_RULE_PREFIX:
1234 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1235 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1236 if (ret > score->ifa->prefix_len)
1237 ret = score->ifa->prefix_len;
1238 score->matchlen = ret;
a9b05723
YH		 1239 break;
1240 default:
1241 ret = 0;
1242 }
1243
1244 if (ret)
1245 __set_bit(i, score->scorebits);
1246 score->rule = i;
1247out:
1248 return ret;
1249}
1250
b3f644fc 1251int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1252 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1253 struct in6_addr *saddr)
1da177e4 1254{
a9b05723
YH		 1255 struct ipv6_saddr_score scores[2],
1256 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1257 struct ipv6_saddr_dst dst;
072047e4 1258 struct net_device *dev;
a9b05723 1259 int dst_type;
1da177e4 1260
a9b05723
YH		 1261 dst_type = __ipv6_addr_type(daddr);
1262 dst.addr = daddr;
1263 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1264 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1265 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1266 dst.prefs = prefs;
a9b05723
YH		 1267
1268 hiscore->rule = -1;
1269 hiscore->ifa = NULL;
1da177e4 1270
8814c4b5 1271 rcu_read_lock();
1da177e4 1272
c6d14c84 1273 for_each_netdev_rcu(net, dev) {
072047e4 1274 struct inet6_dev *idev;
072047e4 1275
a9b05723 1276 /* Candidate Source Address (section 4)
072047e4
YH		 1277 * - multicast and link-local destination address,
1278 * the set of candidate source address MUST only
1279 * include addresses assigned to interfaces
1280 * belonging to the same link as the outgoing
1281 * interface.
1282 * (- For site-local destination addresses, the
1283 * set of candidate source addresses MUST only
1284 * include addresses assigned to interfaces
1285 * belonging to the same site as the outgoing
1286 * interface.)
1287 */
a9b05723
YH		 1288 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1289 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1290 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1291 continue;
1da177e4 1292
1da177e4 1293 idev = __in6_dev_get(dev);
072047e4
YH		 1294 if (!idev)
1295 continue;
1296
1297 read_lock_bh(&idev->lock);
502a2ffd 1298 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1299 int i;
072047e4 1300
a9b05723 1301 /*
6b3ae80a
YH		 1302 * - Tentative Address (RFC2462 section 5.4)
1303 * - A tentative address is not considered
1304 * "assigned to an interface" in the traditional
95c385b4 1305 * sense, unless it is also flagged as optimistic.
6b3ae80a 1306 * - Candidate Source Address (section 4)
072047e4
YH		 1307 * - In any case, anycast addresses, multicast
1308 * addresses, and the unspecified address MUST
1309 * NOT be included in a candidate set.
1310 */
a9b05723
YH		 1311 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1312 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1313 continue;
a9b05723
YH		 1314
1315 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1316
1317 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1318 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1319 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1320 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1321 "assigned as unicast address on %s",
1322 dev->name);
1323 continue;
1324 }
1325
a9b05723
YH		 1326 score->rule = -1;
1327 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1328
1329 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1330 int minihiscore, miniscore;
1331
3de23255
BT		 1332 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1333 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1334
1335 if (minihiscore > miniscore) {
1336 if (i == IPV6_SADDR_RULE_SCOPE &&
1337 score->scopedist > 0) {
1338 /*
1339 * special case:
1340 * each remaining entry
1341 * has too small (not enough)
1342 * scope, because ifa entries
1343 * are sorted by their scope
1344 * values.
1345 */
1346 goto try_nextdev;
1347 }
1348 break;
1349 } else if (minihiscore < miniscore) {
a9b05723
YH		 1350 if (hiscore->ifa)
1351 in6_ifa_put(hiscore->ifa);
1352
1353 in6_ifa_hold(score->ifa);
1354
a0bffffc 1355 swap(hiscore, score);
a9b05723
YH		 1356
1357 /* restore our iterator */
1358 score->ifa = hiscore->ifa;
1359
1360 break;
1da177e4 1361 }
072047e4 1362 }
1da177e4 1363 }
a9b05723 1364try_nextdev:
072047e4 1365 read_unlock_bh(&idev->lock);
1da177e4 1366 }
8814c4b5 1367 rcu_read_unlock();
1da177e4 1368
a9b05723 1369 if (!hiscore->ifa)
072047e4 1370 return -EADDRNOTAVAIL;
1ab1457c 1371
4e3fd7a0 1372 *saddr = hiscore->ifa->addr;
a9b05723 1373 in6_ifa_put(hiscore->ifa);
072047e4 1374 return 0;
1da177e4 1375}
5e5f3f0f 1376EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1377
95c385b4
NH		 1378int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1379 unsigned char banned_flags)
1da177e4
LT		 1380{
1381 struct inet6_dev *idev;
1382 int err = -EADDRNOTAVAIL;
1383
8814c4b5 1384 rcu_read_lock();
e21e8467
SH		 1385 idev = __in6_dev_get(dev);
1386 if (idev) {
1da177e4
LT		 1387 struct inet6_ifaddr *ifp;
1388
1389 read_lock_bh(&idev->lock);
502a2ffd 1390 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1391 if (ifp->scope == IFA_LINK &&
1392 !(ifp->flags & banned_flags)) {
4e3fd7a0 1393 *addr = ifp->addr;
1da177e4
LT		 1394 err = 0;
1395 break;
1396 }
1397 }
1398 read_unlock_bh(&idev->lock);
1399 }
8814c4b5 1400 rcu_read_unlock();
1da177e4
LT		 1401 return err;
1402}
1403
1404static int ipv6_count_addresses(struct inet6_dev *idev)
1405{
1406 int cnt = 0;
1407 struct inet6_ifaddr *ifp;
1408
1409 read_lock_bh(&idev->lock);
502a2ffd 1410 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1411 cnt++;
1412 read_unlock_bh(&idev->lock);
1413 return cnt;
1414}
1415
b71d1d42 1416int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
bfeade08 1417 struct net_device *dev, int strict)
1da177e4 1418{
eedf042a 1419 struct inet6_ifaddr *ifp;
ddbe5032 1420 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1421
5c578aed 1422 rcu_read_lock_bh();
b67bfe0d 1423 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1424 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1425 continue;
1da177e4 1426 if (ipv6_addr_equal(&ifp->addr, addr) &&
eedf042a
SH		 1427 !(ifp->flags&IFA_F_TENTATIVE) &&
1428 (dev == NULL || ifp->idev->dev == dev ||
1429 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1430 rcu_read_unlock_bh();
1431 return 1;
1da177e4
LT		 1432 }
1433 }
5c578aed 1434
eedf042a
SH		 1435 rcu_read_unlock_bh();
1436 return 0;
1da177e4 1437}
7159039a
YH		 1438EXPORT_SYMBOL(ipv6_chk_addr);
1439
3e81c6da
DM		 1440static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1441 struct net_device *dev)
1da177e4 1442{
ddbe5032 1443 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1444 struct inet6_ifaddr *ifp;
1da177e4 1445
b67bfe0d 1446 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1447 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1448 continue;
1da177e4
LT		 1449 if (ipv6_addr_equal(&ifp->addr, addr)) {
1450 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1451 return true;
1da177e4
LT		 1452 }
1453 }
3e81c6da 1454 return false;
1da177e4
LT		 1455}
1456
b71d1d42 1457int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1458{
1459 struct inet6_dev *idev;
1460 struct inet6_ifaddr *ifa;
1461 int onlink;
1462
1463 onlink = 0;
1464 rcu_read_lock();
1465 idev = __in6_dev_get(dev);
1466 if (idev) {
1467 read_lock_bh(&idev->lock);
502a2ffd 1468 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1469 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1470 ifa->prefix_len);
1471 if (onlink)
1472 break;
1473 }
1474 read_unlock_bh(&idev->lock);
1475 }
1476 rcu_read_unlock();
1477 return onlink;
1478}
52eeeb84
YH		 1479EXPORT_SYMBOL(ipv6_chk_prefix);
1480
9acd9f3a 1481struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1482 struct net_device *dev, int strict)
1da177e4 1483{
b79d1d54 1484 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1485 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1486
5c578aed 1487 rcu_read_lock_bh();
b67bfe0d 1488 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1489 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1490 continue;
1da177e4
LT		 1491 if (ipv6_addr_equal(&ifp->addr, addr)) {
1492 if (dev == NULL || ifp->idev->dev == dev ||
1493 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1494 result = ifp;
1da177e4
LT		 1495 in6_ifa_hold(ifp);
1496 break;
1497 }
1498 }
1499 }
5c578aed 1500 rcu_read_unlock_bh();
1da177e4 1501
b79d1d54 1502 return result;
1da177e4
LT		 1503}
1504
1da177e4
LT		 1505/* Gets referenced address, destroys ifaddr */
1506
cc411d0b 1507static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1508{
1da177e4
LT		 1509 if (ifp->flags&IFA_F_PERMANENT) {
1510 spin_lock_bh(&ifp->lock);
1511 addrconf_del_timer(ifp);
1512 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1513 if (dad_failed)
1514 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1515 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1516 if (dad_failed)
1517 ipv6_ifa_notify(0, ifp);
1da177e4
LT		 1518 in6_ifa_put(ifp);
1519#ifdef CONFIG_IPV6_PRIVACY
1520 } else if (ifp->flags&IFA_F_TEMPORARY) {
1521 struct inet6_ifaddr *ifpub;
1522 spin_lock_bh(&ifp->lock);
1523 ifpub = ifp->ifpub;
1524 if (ifpub) {
1525 in6_ifa_hold(ifpub);
1526 spin_unlock_bh(&ifp->lock);
1527 ipv6_create_tempaddr(ifpub, ifp);
1528 in6_ifa_put(ifpub);
1529 } else {
1530 spin_unlock_bh(&ifp->lock);
1531 }
1532 ipv6_del_addr(ifp);
1533#endif
1534 } else
1535 ipv6_del_addr(ifp);
1536}
1537
f2344a13
HX		 1538static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1539{
1540 int err = -ENOENT;
1541
1542 spin_lock(&ifp->state_lock);
1543 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1544 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1545 err = 0;
1546 }
1547 spin_unlock(&ifp->state_lock);
1548
1549 return err;
1550}
1551
3c21edbd
YH		 1552void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1553{
1b34be74 1554 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1555
853dc2e0
UB		 1556 if (addrconf_dad_end(ifp)) {
1557 in6_ifa_put(ifp);
f2344a13 1558 return;
853dc2e0 1559 }
f2344a13 1560
e87cc472
JP		 1561 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1562 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1563
1b34be74
YH		 1564 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1565 struct in6_addr addr;
1566
1567 addr.s6_addr32[0] = htonl(0xfe800000);
1568 addr.s6_addr32[1] = 0;
1569
1570 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1571 ipv6_addr_equal(&ifp->addr, &addr)) {
1572 /* DAD failed for link-local based on MAC address */
1573 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1574
f3213831 1575 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1576 ifp->idev->dev->name);
1b34be74
YH		 1577 }
1578 }
1579
cc411d0b 1580 addrconf_dad_stop(ifp, 1);
3c21edbd 1581}
1da177e4
LT		 1582
1583/* Join to solicited addr multicast group. */
1584
b71d1d42 1585void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1586{
1587 struct in6_addr maddr;
1588
1589 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1590 return;
1591
1592 addrconf_addr_solict_mult(addr, &maddr);
1593 ipv6_dev_mc_inc(dev, &maddr);
1594}
1595
b71d1d42 1596void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1597{
1598 struct in6_addr maddr;
1599
1600 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1601 return;
1602
1603 addrconf_addr_solict_mult(addr, &maddr);
1604 __ipv6_dev_mc_dec(idev, &maddr);
1605}
1606
20380731 1607static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1608{
1609 struct in6_addr addr;
2bda8a0c
BM		 1610 if (ifp->prefix_len == 127) /* RFC 6164 */
1611 return;
1da177e4
LT		 1612 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1613 if (ipv6_addr_any(&addr))
1614 return;
1615 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1616}
1617
20380731 1618static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1619{
1620 struct in6_addr addr;
32019e65
YH		 1621 if (ifp->prefix_len == 127) /* RFC 6164 */
1622 return;
1da177e4
LT		 1623 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1624 if (ipv6_addr_any(&addr))
1625 return;
1626 __ipv6_dev_ac_dec(ifp->idev, &addr);
1627}
1628
073a8e0e
YH		 1629static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1630{
1631 if (dev->addr_len != ETH_ALEN)
1632 return -1;
1633 memcpy(eui, dev->dev_addr, 3);
1634 memcpy(eui + 5, dev->dev_addr + 3, 3);
1635
1636 /*
1637 * The zSeries OSA network cards can be shared among various
1638 * OS instances, but the OSA cards have only one MAC address.
1639 * This leads to duplicate address conflicts in conjunction
1640 * with IPv6 if more than one instance uses the same card.
1641 *
1642 * The driver for these cards can deliver a unique 16-bit
1643 * identifier for each instance sharing the same card. It is
1644 * placed instead of 0xFFFE in the interface identifier. The
1645 * "u" bit of the interface identifier is not inverted in this
1646 * case. Hence the resulting interface identifier has local
1647 * scope according to RFC2373.
1648 */
1649 if (dev->dev_id) {
1650 eui[3] = (dev->dev_id >> 8) & 0xFF;
1651 eui[4] = dev->dev_id & 0xFF;
1652 } else {
1653 eui[3] = 0xFF;
1654 eui[4] = 0xFE;
1655 eui[0] ^= 2;
1656 }
1657 return 0;
1658}
1659
06a4c1c5 1660static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1661{
1662 if (dev->addr_len != IEEE802154_ADDR_LEN)
1663 return -1;
1664 memcpy(eui, dev->dev_addr, 8);
5e98a36e 1665 eui[0] ^= 2;
06a4c1c5 1666 return 0;
1667}
1668
073a8e0e
YH		 1669static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1670{
1671 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1672 if (dev->addr_len != ARCNET_ALEN)
1673 return -1;
1674 memset(eui, 0, 7);
8e5e8f30 1675 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1676 return 0;
1677}
1678
1679static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1680{
1681 if (dev->addr_len != INFINIBAND_ALEN)
1682 return -1;
1683 memcpy(eui, dev->dev_addr + 12, 8);
1684 eui[0] |= 2;
1685 return 0;
1686}
1687
c61393ea 1688static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1689{
9af28511
SH		 1690 if (addr == 0)
1691 return -1;
dfd982ba
YH		 1692 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1693 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1694 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1695 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1696 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1697 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1698 eui[1] = 0;
1699 eui[2] = 0x5E;
1700 eui[3] = 0xFE;
1701 memcpy(eui + 4, &addr, 4);
1702 return 0;
1703}
dfd982ba
YH		 1704
1705static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1706{
1707 if (dev->priv_flags & IFF_ISATAP)
1708 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1709 return -1;
1710}
1711
aee80b54 1712static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1713{
1714 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1715}
1716
1da177e4
LT		 1717static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1718{
1719 switch (dev->type) {
1720 case ARPHRD_ETHER:
1721 case ARPHRD_FDDI:
073a8e0e 1722 return addrconf_ifid_eui48(eui, dev);
1da177e4 1723 case ARPHRD_ARCNET:
073a8e0e 1724 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1725 case ARPHRD_INFINIBAND:
073a8e0e 1726 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1727 case ARPHRD_SIT:
dfd982ba 1728 return addrconf_ifid_sit(eui, dev);
aee80b54 1729 case ARPHRD_IPGRE:
1730 return addrconf_ifid_gre(eui, dev);
06a4c1c5 1731 case ARPHRD_IEEE802154:
1732 return addrconf_ifid_eui64(eui, dev);
1da177e4
LT		 1733 }
1734 return -1;
1735}
1736
1737static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1738{
1739 int err = -1;
1740 struct inet6_ifaddr *ifp;
1741
1742 read_lock_bh(&idev->lock);
502a2ffd 1743 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 1744 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1745 memcpy(eui, ifp->addr.s6_addr+8, 8);
1746 err = 0;
1747 break;
1748 }
1749 }
1750 read_unlock_bh(&idev->lock);
1751 return err;
1752}
1753
1754#ifdef CONFIG_IPV6_PRIVACY
1755/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 1756static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 1757{
1da177e4 1758regen:
955189ef 1759 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1760 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1761
1762 /*
1763 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1764 * check if generated address is not inappropriate
1765 *
1766 * - Reserved subnet anycast (RFC 2526)
1767 * 11111101 11....11 1xxxxxxx
c7dc89c0 1768 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1769 * 00-00-5E-FE-xx-xx-xx-xx
1770 * - value 0
1771 * - XXX: already assigned to an address on the device
1772 */
1ab1457c 1773 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1774 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1775 (idev->rndid[7]&0x80))
1776 goto regen;
1777 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1778 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1779 goto regen;
1780 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1781 goto regen;
1782 }
1da177e4
LT		 1783}
1784
1785static void ipv6_regen_rndid(unsigned long data)
1786{
1787 struct inet6_dev *idev = (struct inet6_dev *) data;
1788 unsigned long expires;
1789
8814c4b5 1790 rcu_read_lock_bh();
1da177e4
LT		 1791 write_lock_bh(&idev->lock);
1792
1793 if (idev->dead)
1794 goto out;
1795
eb7e0575 1796 __ipv6_regen_rndid(idev);
1ab1457c 1797
1da177e4 1798 expires = jiffies +
1ab1457c 1799 idev->cnf.temp_prefered_lft * HZ -
784e2710
BH		 1800 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1801 idev->cnf.max_desync_factor * HZ;
1da177e4 1802 if (time_before(expires, jiffies)) {
f3213831
JP		 1803 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1804 __func__, idev->dev->name);
1da177e4
LT		 1805 goto out;
1806 }
1807
1808 if (!mod_timer(&idev->regen_timer, expires))
1809 in6_dev_hold(idev);
1810
1811out:
1812 write_unlock_bh(&idev->lock);
8814c4b5 1813 rcu_read_unlock_bh();
1da177e4
LT		 1814 in6_dev_put(idev);
1815}
1816
eb7e0575 1817static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 1818{
1da177e4 1819 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 1820 __ipv6_regen_rndid(idev);
1da177e4
LT		 1821}
1822#endif
1823
1824/*
1825 * Add prefix route.
1826 */
1827
1828static void
1829addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1830 unsigned long expires, u32 flags)
1da177e4 1831{
86872cb5
TG		 1832 struct fib6_config cfg = {
1833 .fc_table = RT6_TABLE_PREFIX,
1834 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1835 .fc_ifindex = dev->ifindex,
1836 .fc_expires = expires,
1837 .fc_dst_len = plen,
1838 .fc_flags = RTF_UP | flags,
c346dca1 1839 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1840 .fc_protocol = RTPROT_KERNEL,
86872cb5 1841 };
1da177e4 1842
4e3fd7a0 1843 cfg.fc_dst = *pfx;
1da177e4
LT		 1844
1845 /* Prevent useless cloning on PtP SIT.
1846 This thing is done here expecting that the whole
1847 class of non-broadcast devices need not cloning.
1848 */
07a93626 1849#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 1850 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1851 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1852#endif
1da177e4 1853
86872cb5 1854 ip6_route_add(&cfg);
1da177e4
LT		 1855}
1856
14ef37b6
AH		 1857
1858static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1859 int plen,
1860 const struct net_device *dev,
1861 u32 flags, u32 noflags)
1862{
1863 struct fib6_node *fn;
1864 struct rt6_info *rt = NULL;
1865 struct fib6_table *table;
1866
1867 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1868 if (table == NULL)
1869 return NULL;
1870
5744dd9b 1871 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 1872 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1873 if (!fn)
1874 goto out;
1875 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 1876 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 1877 continue;
1878 if ((rt->rt6i_flags & flags) != flags)
1879 continue;
85da53bf 1880 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 1881 continue;
1882 dst_hold(&rt->dst);
1883 break;
1884 }
1885out:
5744dd9b 1886 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 1887 return rt;
1888}
1889
1890
1da177e4
LT		 1891/* Create "default" multicast route to the interface */
1892
1893static void addrconf_add_mroute(struct net_device *dev)
1894{
86872cb5
TG		 1895 struct fib6_config cfg = {
1896 .fc_table = RT6_TABLE_LOCAL,
1897 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1898 .fc_ifindex = dev->ifindex,
1899 .fc_dst_len = 8,
1900 .fc_flags = RTF_UP,
c346dca1 1901 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1902 };
1903
1904 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1905
1906 ip6_route_add(&cfg);
1da177e4
LT		 1907}
1908
07a93626 1909#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 1910static void sit_route_add(struct net_device *dev)
1911{
86872cb5
TG		 1912 struct fib6_config cfg = {
1913 .fc_table = RT6_TABLE_MAIN,
1914 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1915 .fc_ifindex = dev->ifindex,
1916 .fc_dst_len = 96,
1917 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1918 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1919 };
1da177e4
LT		 1920
1921 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1922 ip6_route_add(&cfg);
1da177e4 1923}
0be669bb 1924#endif
1da177e4 1925
1da177e4
LT		 1926static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1927{
1928 struct inet6_dev *idev;
1929
1930 ASSERT_RTNL();
1931
e21e8467
SH		 1932 idev = ipv6_find_idev(dev);
1933 if (!idev)
64e724f6
BH		 1934 return ERR_PTR(-ENOBUFS);
1935
1936 if (idev->cnf.disable_ipv6)
1937 return ERR_PTR(-EACCES);
1da177e4
LT		 1938
1939 /* Add default multicast route */
4af04aba
LW		 1940 if (!(dev->flags & IFF_LOOPBACK))
1941 addrconf_add_mroute(dev);
1da177e4 1942
1da177e4
LT		 1943 return idev;
1944}
1945
e6bff995 1946void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 1947{
1948 struct prefix_info *pinfo;
1949 __u32 valid_lft;
1950 __u32 prefered_lft;
1951 int addr_type;
1da177e4 1952 struct inet6_dev *in6_dev;
56d417b1 1953 struct net *net = dev_net(dev);
1da177e4
LT		 1954
1955 pinfo = (struct prefix_info *) opt;
1ab1457c 1956
1da177e4
LT		 1957 if (len < sizeof(struct prefix_info)) {
1958 ADBG(("addrconf: prefix option too short\n"));
1959 return;
1960 }
1ab1457c 1961
1da177e4
LT		 1962 /*
1963 * Validation checks ([ADDRCONF], page 19)
1964 */
1965
1966 addr_type = ipv6_addr_type(&pinfo->prefix);
1967
1968 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1969 return;
1970
1971 valid_lft = ntohl(pinfo->valid);
1972 prefered_lft = ntohl(pinfo->prefered);
1973
1974 if (prefered_lft > valid_lft) {
e87cc472 1975 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 1976 return;
1977 }
1978
1979 in6_dev = in6_dev_get(dev);
1980
1981 if (in6_dev == NULL) {
e87cc472
JP		 1982 net_dbg_ratelimited("addrconf: device %s not configured\n",
1983 dev->name);
1da177e4
LT		 1984 return;
1985 }
1986
1987 /*
1988 * Two things going on here:
1989 * 1) Add routes for on-link prefixes
1990 * 2) Configure prefixes with the auto flag set
1991 */
1992
4bed72e4
YH		 1993 if (pinfo->onlink) {
1994 struct rt6_info *rt;
1995 unsigned long rt_expires;
1996
6f704992
YH		 1997 /* Avoid arithmetic overflow. Really, we could
1998 * save rt_expires in seconds, likely valid_lft,
1999 * but it would require division in fib gc, that it
2000 * not good.
2001 */
4bed72e4
YH		 2002 if (HZ > USER_HZ)
2003 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2004 else
2005 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2006
4bed72e4
YH		 2007 if (addrconf_finite_timeout(rt_expires))
2008 rt_expires *= HZ;
1da177e4 2009
14ef37b6
AH		 2010 rt = addrconf_get_prefix_route(&pinfo->prefix,
2011 pinfo->prefix_len,
2012 dev,
2013 RTF_ADDRCONF | RTF_PREFIX_RT,
2014 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2015
14ef37b6 2016 if (rt) {
6f704992
YH		 2017 /* Autoconf prefix route */
2018 if (valid_lft == 0) {
2019 ip6_del_rt(rt);
2020 rt = NULL;
4bed72e4 2021 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2022 /* not infinity */
1716a961 2023 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2024 } else {
1716a961 2025 rt6_clean_expires(rt);
1da177e4
LT		 2026 }
2027 } else if (valid_lft) {
6f704992 2028 clock_t expires = 0;
4bed72e4
YH		 2029 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2030 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2031 /* not infinity */
2032 flags |= RTF_EXPIRES;
2033 expires = jiffies_to_clock_t(rt_expires);
2034 }
1da177e4 2035 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2036 dev, expires, flags);
1da177e4 2037 }
94e187c0 2038 ip6_rt_put(rt);
1da177e4
LT		 2039 }
2040
2041 /* Try to figure out our local address for this prefix */
2042
2043 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2044 struct inet6_ifaddr *ifp;
1da177e4
LT		 2045 struct in6_addr addr;
2046 int create = 0, update_lft = 0;
2047
2048 if (pinfo->prefix_len == 64) {
2049 memcpy(&addr, &pinfo->prefix, 8);
2050 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2051 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2052 in6_dev_put(in6_dev);
2053 return;
2054 }
2055 goto ok;
2056 }
e87cc472
JP		 2057 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2058 pinfo->prefix_len);
1da177e4
LT		 2059 in6_dev_put(in6_dev);
2060 return;
2061
2062ok:
2063
53b7997f 2064 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 2065
2066 if (ifp == NULL && valid_lft) {
2067 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2068 u32 addr_flags = 0;
2069
2070#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2071 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2072 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 2073 addr_flags = IFA_F_OPTIMISTIC;
2074#endif
1da177e4
LT		 2075
2076 /* Do not allow to create too much of autoconfigured
2077 * addresses; this would be too easy way to crash kernel.
2078 */
2079 if (!max_addresses ||
2080 ipv6_count_addresses(in6_dev) < max_addresses)
2081 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 2082 addr_type&IPV6_ADDR_SCOPE_MASK,
2083 addr_flags);
1da177e4 2084
3f0d2ba0 2085 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2086 in6_dev_put(in6_dev);
2087 return;
2088 }
2089
2090 update_lft = create = 1;
2091 ifp->cstamp = jiffies;
cf22f9a2 2092 addrconf_dad_start(ifp);
1da177e4
LT		 2093 }
2094
2095 if (ifp) {
2096 int flags;
2097 unsigned long now;
2098#ifdef CONFIG_IPV6_PRIVACY
2099 struct inet6_ifaddr *ift;
2100#endif
2101 u32 stored_lft;
2102
2103 /* update lifetime (RFC2462 5.5.3 e) */
2104 spin_lock(&ifp->lock);
2105 now = jiffies;
2106 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2107 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2108 else
2109 stored_lft = 0;
2110 if (!update_lft && stored_lft) {
2111 if (valid_lft > MIN_VALID_LIFETIME ||
2112 valid_lft > stored_lft)
2113 update_lft = 1;
2114 else if (stored_lft <= MIN_VALID_LIFETIME) {
2115 /* valid_lft <= stored_lft is always true */
a1ed0526
BH		 2116 /*
2117 * RFC 4862 Section 5.5.3e:
2118 * "Note that the preferred lifetime of
2119 * the corresponding address is always
2120 * reset to the Preferred Lifetime in
2121 * the received Prefix Information
2122 * option, regardless of whether the
2123 * valid lifetime is also reset or
2124 * ignored."
2125 *
2126 * So if the preferred lifetime in
2127 * this advertisement is different
2128 * than what we have stored, but the
2129 * valid lifetime is invalid, just
2130 * reset prefered_lft.
2131 *
2132 * We must set the valid lifetime
2133 * to the stored lifetime since we'll
2134 * be updating the timestamp below,
2135 * else we'll set it back to the
25985edc 2136 * minimum.
a1ed0526
BH		 2137 */
2138 if (prefered_lft != ifp->prefered_lft) {
2139 valid_lft = stored_lft;
2140 update_lft = 1;
2141 }
1da177e4
LT		 2142 } else {
2143 valid_lft = MIN_VALID_LIFETIME;
2144 if (valid_lft < prefered_lft)
2145 prefered_lft = valid_lft;
2146 update_lft = 1;
2147 }
2148 }
2149
2150 if (update_lft) {
2151 ifp->valid_lft = valid_lft;
2152 ifp->prefered_lft = prefered_lft;
2153 ifp->tstamp = now;
2154 flags = ifp->flags;
2155 ifp->flags &= ~IFA_F_DEPRECATED;
2156 spin_unlock(&ifp->lock);
2157
2158 if (!(flags&IFA_F_TENTATIVE))
2159 ipv6_ifa_notify(0, ifp);
2160 } else
2161 spin_unlock(&ifp->lock);
2162
2163#ifdef CONFIG_IPV6_PRIVACY
2164 read_lock_bh(&in6_dev->lock);
2165 /* update all temporary addresses in the list */
76f793e3
LC		 2166 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2167 tmp_list) {
2168 int age, max_valid, max_prefered;
2169
c6fbfac2
BB		 2170 if (ifp != ift->ifpub)
2171 continue;
2172
76f793e3
LC		 2173 /*
2174 * RFC 4941 section 3.3:
2175 * If a received option will extend the lifetime
2176 * of a public address, the lifetimes of
2177 * temporary addresses should be extended,
2178 * subject to the overall constraint that no
2179 * temporary addresses should ever remain
2180 * "valid" or "preferred" for a time longer than
2181 * (TEMP_VALID_LIFETIME) or
2182 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2183 * respectively.
2184 */
2185 age = (now - ift->cstamp) / HZ;
2186 max_valid = in6_dev->cnf.temp_valid_lft - age;
2187 if (max_valid < 0)
2188 max_valid = 0;
2189
2190 max_prefered = in6_dev->cnf.temp_prefered_lft -
2191 in6_dev->cnf.max_desync_factor -
2192 age;
2193 if (max_prefered < 0)
2194 max_prefered = 0;
2195
2196 if (valid_lft > max_valid)
2197 valid_lft = max_valid;
2198
2199 if (prefered_lft > max_prefered)
2200 prefered_lft = max_prefered;
2201
1da177e4
LT		 2202 spin_lock(&ift->lock);
2203 flags = ift->flags;
76f793e3
LC		 2204 ift->valid_lft = valid_lft;
2205 ift->prefered_lft = prefered_lft;
2206 ift->tstamp = now;
2207 if (prefered_lft > 0)
2208 ift->flags &= ~IFA_F_DEPRECATED;
2209
1da177e4
LT		 2210 spin_unlock(&ift->lock);
2211 if (!(flags&IFA_F_TENTATIVE))
2212 ipv6_ifa_notify(0, ift);
2213 }
2214
aed65501 2215 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
1da177e4 2216 /*
76f793e3
LC		 2217 * When a new public address is created as
2218 * described in [ADDRCONF], also create a new
2219 * temporary address. Also create a temporary
2220 * address if it's enabled but no temporary
2221 * address currently exists.
1da177e4 2222 */
1ab1457c 2223 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 2224 ipv6_create_tempaddr(ifp, NULL);
2225 } else {
2226 read_unlock_bh(&in6_dev->lock);
2227 }
2228#endif
2229 in6_ifa_put(ifp);
2230 addrconf_verify(0);
2231 }
2232 }
2233 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2234 in6_dev_put(in6_dev);
2235}
2236
2237/*
2238 * Set destination address.
2239 * Special case for SIT interfaces where we create a new "virtual"
2240 * device.
2241 */
af284937 2242int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2243{
2244 struct in6_ifreq ireq;
2245 struct net_device *dev;
2246 int err = -EINVAL;
2247
2248 rtnl_lock();
2249
2250 err = -EFAULT;
2251 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2252 goto err_exit;
2253
af284937 2254 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2255
2256 err = -ENODEV;
2257 if (dev == NULL)
2258 goto err_exit;
2259
07a93626 2260#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2261 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2262 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2263 struct ifreq ifr;
1da177e4
LT		 2264 struct ip_tunnel_parm p;
2265
2266 err = -EADDRNOTAVAIL;
2267 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2268 goto err_exit;
2269
2270 memset(&p, 0, sizeof(p));
2271 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2272 p.iph.saddr = 0;
2273 p.iph.version = 4;
2274 p.iph.ihl = 5;
2275 p.iph.protocol = IPPROTO_IPV6;
2276 p.iph.ttl = 64;
d20b3109 2277 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2278
5bc3eb7e
SH		 2279 if (ops->ndo_do_ioctl) {
2280 mm_segment_t oldfs = get_fs();
2281
2282 set_fs(KERNEL_DS);
2283 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2284 set_fs(oldfs);
2285 } else
2286 err = -EOPNOTSUPP;
1da177e4
LT		 2287
2288 if (err == 0) {
2289 err = -ENOBUFS;
af284937
DL		 2290 dev = __dev_get_by_name(net, p.name);
2291 if (!dev)
1da177e4
LT		 2292 goto err_exit;
2293 err = dev_open(dev);
2294 }
2295 }
0be669bb 2296#endif
1da177e4
LT		 2297
2298err_exit:
2299 rtnl_unlock();
2300 return err;
2301}
2302
2303/*
2304 * Manual configuration of address on an interface
2305 */
b71d1d42 2306static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2307 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2308 __u32 valid_lft)
1da177e4
LT		 2309{
2310 struct inet6_ifaddr *ifp;
2311 struct inet6_dev *idev;
2312 struct net_device *dev;
2313 int scope;
6f704992
YH		 2314 u32 flags;
2315 clock_t expires;
4bed72e4 2316 unsigned long timeout;
1da177e4
LT		 2317
2318 ASSERT_RTNL();
1ab1457c 2319
24ef0da7
TG		 2320 if (plen > 128)
2321 return -EINVAL;
2322
0778769d
NT		 2323 /* check the lifetime */
2324 if (!valid_lft || prefered_lft > valid_lft)
2325 return -EINVAL;
2326
af284937
DL		 2327 dev = __dev_get_by_index(net, ifindex);
2328 if (!dev)
1da177e4 2329 return -ENODEV;
1ab1457c 2330
64e724f6
BH		 2331 idev = addrconf_add_dev(dev);
2332 if (IS_ERR(idev))
2333 return PTR_ERR(idev);
1da177e4
LT		 2334
2335 scope = ipv6_addr_scope(pfx);
2336
4bed72e4
YH		 2337 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2338 if (addrconf_finite_timeout(timeout)) {
2339 expires = jiffies_to_clock_t(timeout * HZ);
2340 valid_lft = timeout;
6f704992 2341 flags = RTF_EXPIRES;
4bed72e4
YH		 2342 } else {
2343 expires = 0;
2344 flags = 0;
2345 ifa_flags |= IFA_F_PERMANENT;
6f704992 2346 }
0778769d 2347
4bed72e4
YH		 2348 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2349 if (addrconf_finite_timeout(timeout)) {
2350 if (timeout == 0)
2351 ifa_flags |= IFA_F_DEPRECATED;
2352 prefered_lft = timeout;
2353 }
0778769d
NT		 2354
2355 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2356
1da177e4 2357 if (!IS_ERR(ifp)) {
06aebfb7 2358 spin_lock_bh(&ifp->lock);
0778769d
NT		 2359 ifp->valid_lft = valid_lft;
2360 ifp->prefered_lft = prefered_lft;
2361 ifp->tstamp = jiffies;
06aebfb7 2362 spin_unlock_bh(&ifp->lock);
0778769d 2363
46d48046 2364 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2365 expires, flags);
95c385b4
NH		 2366 /*
2367 * Note that section 3.1 of RFC 4429 indicates
2368 * that the Optimistic flag should not be set for
2369 * manually configured addresses
2370 */
cf22f9a2 2371 addrconf_dad_start(ifp);
1da177e4 2372 in6_ifa_put(ifp);
0778769d 2373 addrconf_verify(0);
1da177e4
LT		 2374 return 0;
2375 }
2376
2377 return PTR_ERR(ifp);
2378}
2379
b71d1d42 2380static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2381 unsigned int plen)
1da177e4
LT		 2382{
2383 struct inet6_ifaddr *ifp;
2384 struct inet6_dev *idev;
2385 struct net_device *dev;
1ab1457c 2386
24ef0da7
TG		 2387 if (plen > 128)
2388 return -EINVAL;
2389
af284937
DL		 2390 dev = __dev_get_by_index(net, ifindex);
2391 if (!dev)
1da177e4
LT		 2392 return -ENODEV;
2393
2394 if ((idev = __in6_dev_get(dev)) == NULL)
2395 return -ENXIO;
2396
2397 read_lock_bh(&idev->lock);
502a2ffd 2398 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2399 if (ifp->prefix_len == plen &&
2400 ipv6_addr_equal(pfx, &ifp->addr)) {
2401 in6_ifa_hold(ifp);
2402 read_unlock_bh(&idev->lock);
1ab1457c 2403
1da177e4
LT		 2404 ipv6_del_addr(ifp);
2405
2406 /* If the last address is deleted administratively,
2407 disable IPv6 on this interface.
2408 */
502a2ffd 2409 if (list_empty(&idev->addr_list))
1da177e4
LT		 2410 addrconf_ifdown(idev->dev, 1);
2411 return 0;
2412 }
2413 }
2414 read_unlock_bh(&idev->lock);
2415 return -EADDRNOTAVAIL;
2416}
2417
2418
af284937 2419int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2420{
2421 struct in6_ifreq ireq;
2422 int err;
1ab1457c 2423
af31f412 2424 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2425 return -EPERM;
1ab1457c 2426
1da177e4
LT		 2427 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2428 return -EFAULT;
2429
2430 rtnl_lock();
af284937
DL		 2431 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2432 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2433 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2434 rtnl_unlock();
2435 return err;
2436}
2437
af284937 2438int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2439{
2440 struct in6_ifreq ireq;
2441 int err;
1ab1457c 2442
af31f412 2443 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2444 return -EPERM;
2445
2446 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2447 return -EFAULT;
2448
2449 rtnl_lock();
af284937
DL		 2450 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2451 ireq.ifr6_prefixlen);
1da177e4
LT		 2452 rtnl_unlock();
2453 return err;
2454}
2455
b5f348e5
IJ		 2456static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2457 int plen, int scope)
2458{
2459 struct inet6_ifaddr *ifp;
2460
2461 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2462 if (!IS_ERR(ifp)) {
2463 spin_lock_bh(&ifp->lock);
2464 ifp->flags &= ~IFA_F_TENTATIVE;
2465 spin_unlock_bh(&ifp->lock);
2466 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2467 in6_ifa_put(ifp);
2468 }
2469}
2470
07a93626 2471#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2472static void sit_add_v4_addrs(struct inet6_dev *idev)
2473{
1da177e4
LT		 2474 struct in6_addr addr;
2475 struct net_device *dev;
c346dca1 2476 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2477 int scope;
2478
2479 ASSERT_RTNL();
2480
2481 memset(&addr, 0, sizeof(struct in6_addr));
2482 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2483
2484 if (idev->dev->flags&IFF_POINTOPOINT) {
2485 addr.s6_addr32[0] = htonl(0xfe800000);
2486 scope = IFA_LINK;
2487 } else {
2488 scope = IPV6_ADDR_COMPATv4;
2489 }
2490
2491 if (addr.s6_addr32[3]) {
b5f348e5 2492 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2493 return;
2494 }
2495
6fda7350 2496 for_each_netdev(net, dev) {
8e5e8f30 2497 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2498 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2499 struct in_ifaddr *ifa;
1da177e4
LT		 2500
2501 int flag = scope;
2502
2503 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2504 int plen;
2505
2506 addr.s6_addr32[3] = ifa->ifa_local;
2507
2508 if (ifa->ifa_scope == RT_SCOPE_LINK)
2509 continue;
2510 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2511 if (idev->dev->flags&IFF_POINTOPOINT)
2512 continue;
2513 flag |= IFA_HOST;
2514 }
2515 if (idev->dev->flags&IFF_POINTOPOINT)
2516 plen = 64;
2517 else
2518 plen = 96;
2519
b5f348e5 2520 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2521 }
2522 }
1ab1457c 2523 }
1da177e4 2524}
0be669bb 2525#endif
1da177e4
LT		 2526
2527static void init_loopback(struct net_device *dev)
2528{
2529 struct inet6_dev *idev;
25fb6ca4
BK		 2530 struct net_device *sp_dev;
2531 struct inet6_ifaddr *sp_ifa;
2532 struct rt6_info *sp_rt;
1da177e4
LT		 2533
2534 /* ::1 */
2535
2536 ASSERT_RTNL();
2537
2538 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2539 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2540 return;
2541 }
2542
b5f348e5 2543 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2544
2545 /* Add routes to other interface's IPv6 addresses */
2546 for_each_netdev(dev_net(dev), sp_dev) {
2547 if (!strcmp(sp_dev->name, dev->name))
2548 continue;
2549
2550 idev = __in6_dev_get(sp_dev);
2551 if (!idev)
2552 continue;
2553
2554 read_lock_bh(&idev->lock);
2555 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2556
2557 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2558 continue;
2559
2560 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
2561
2562 /* Failure cases are ignored */
2563 if (!IS_ERR(sp_rt))
2564 ip6_ins_rt(sp_rt);
2565 }
2566 read_unlock_bh(&idev->lock);
2567 }
1da177e4
LT		 2568}
2569
b71d1d42 2570static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4 2571{
8e5e8f30 2572 struct inet6_ifaddr *ifp;
95c385b4
NH		 2573 u32 addr_flags = IFA_F_PERMANENT;
2574
2575#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2576 if (idev->cnf.optimistic_dad &&
702beb87 2577 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2578 addr_flags |= IFA_F_OPTIMISTIC;
2579#endif
1da177e4 2580
95c385b4
NH		 2581
2582 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2583 if (!IS_ERR(ifp)) {
46d48046 2584 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2585 addrconf_dad_start(ifp);
1da177e4
LT		 2586 in6_ifa_put(ifp);
2587 }
2588}
2589
2590static void addrconf_dev_config(struct net_device *dev)
2591{
2592 struct in6_addr addr;
8e5e8f30 2593 struct inet6_dev *idev;
1da177e4
LT		 2594
2595 ASSERT_RTNL();
2596
74235a25
HX		 2597 if ((dev->type != ARPHRD_ETHER) &&
2598 (dev->type != ARPHRD_FDDI) &&
74235a25 2599 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 2600 (dev->type != ARPHRD_INFINIBAND) &&
2601 (dev->type != ARPHRD_IEEE802154)) {
74235a25
HX		 2602 /* Alas, we support only Ethernet autoconfiguration. */
2603 return;
2604 }
2605
1da177e4 2606 idev = addrconf_add_dev(dev);
64e724f6 2607 if (IS_ERR(idev))
1da177e4
LT		 2608 return;
2609
2610 memset(&addr, 0, sizeof(struct in6_addr));
2611 addr.s6_addr32[0] = htonl(0xFE800000);
2612
2613 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2614 addrconf_add_linklocal(idev, &addr);
2615}
2616
07a93626 2617#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2618static void addrconf_sit_config(struct net_device *dev)
2619{
2620 struct inet6_dev *idev;
2621
2622 ASSERT_RTNL();
2623
1ab1457c
YH		 2624 /*
2625 * Configure the tunnel with one of our IPv4
2626 * addresses... we should configure all of
1da177e4
LT		 2627 * our v4 addrs in the tunnel
2628 */
2629
2630 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2631 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2632 return;
2633 }
2634
c7dc89c0
FT		 2635 if (dev->priv_flags & IFF_ISATAP) {
2636 struct in6_addr addr;
2637
2638 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2639 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2640 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2641 addrconf_add_linklocal(idev, &addr);
2642 return;
2643 }
2644
1da177e4
LT		 2645 sit_add_v4_addrs(idev);
2646
62b54dd9 2647 if (dev->flags&IFF_POINTOPOINT)
1da177e4 2648 addrconf_add_mroute(dev);
62b54dd9 2649 else
1da177e4
LT		 2650 sit_route_add(dev);
2651}
0be669bb 2652#endif
1da177e4 2653
07a93626 2654#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2655static void addrconf_gre_config(struct net_device *dev)
2656{
2657 struct inet6_dev *idev;
2658 struct in6_addr addr;
2659
f3213831 2660 pr_info("%s(%s)\n", __func__, dev->name);
aee80b54 2661
2662 ASSERT_RTNL();
2663
2664 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2665 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 2666 return;
2667 }
2668
2669 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2670 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2671
2672 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2673 addrconf_add_linklocal(idev, &addr);
2674}
2675#endif
2676
1da177e4
LT		 2677static inline int
2678ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2679{
2680 struct in6_addr lladdr;
2681
95c385b4 2682 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2683 addrconf_add_linklocal(idev, &lladdr);
2684 return 0;
2685 }
2686 return -1;
2687}
2688
2689static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2690{
2691 struct net_device *link_dev;
c346dca1 2692 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2693
2694 /* first try to inherit the link-local address from the link device */
2695 if (idev->dev->iflink &&
6fda7350 2696 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2697 if (!ipv6_inherit_linklocal(idev, link_dev))
2698 return;
2699 }
2700 /* then try to inherit it from any device */
6fda7350 2701 for_each_netdev(net, link_dev) {
1da177e4
LT		 2702 if (!ipv6_inherit_linklocal(idev, link_dev))
2703 return;
2704 }
91df42be 2705 pr_debug("init ip6-ip6: add_linklocal failed\n");
1da177e4
LT		 2706}
2707
2708/*
2709 * Autoconfigure tunnel with a link-local address so routing protocols,
2710 * DHCPv6, MLD etc. can be run over the virtual link
2711 */
2712
2713static void addrconf_ip6_tnl_config(struct net_device *dev)
2714{
2715 struct inet6_dev *idev;
2716
2717 ASSERT_RTNL();
2718
e21e8467 2719 idev = addrconf_add_dev(dev);
64e724f6 2720 if (IS_ERR(idev)) {
91df42be 2721 pr_debug("init ip6-ip6: add_dev failed\n");
1da177e4
LT		 2722 return;
2723 }
2724 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2725}
2726
1ab1457c 2727static int addrconf_notify(struct notifier_block *this, unsigned long event,
8e5e8f30 2728 void *data)
1da177e4
LT		 2729{
2730 struct net_device *dev = (struct net_device *) data;
748e2d93 2731 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2732 int run_pending = 0;
b217d616 2733 int err;
1da177e4 2734
e21e8467 2735 switch (event) {
45ba9dd2 2736 case NETDEV_REGISTER:
74235a25 2737 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2738 idev = ipv6_add_dev(dev);
2739 if (!idev)
b217d616 2740 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2741 }
2742 break;
bcdd553f 2743
1da177e4 2744 case NETDEV_UP:
3c21edbd 2745 case NETDEV_CHANGE:
c2edacf8
JV		 2746 if (dev->flags & IFF_SLAVE)
2747 break;
2748
3c21edbd 2749 if (event == NETDEV_UP) {
f24e3d65 2750 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 2751 /* device is not ready yet. */
f3213831 2752 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 2753 dev->name);
2754 break;
2755 }
99081049 2756
d31c7b8f
EP		 2757 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2758 idev = ipv6_add_dev(dev);
2759
e3ec6cfc 2760 if (idev) {
99081049 2761 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2762 run_pending = 1;
2763 }
3c21edbd 2764 } else {
f24e3d65 2765 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2766 /* device is still not ready. */
2767 break;
2768 }
2769
2770 if (idev) {
bcdd553f 2771 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2772 /* device is already configured. */
2773 break;
3c21edbd
YH		 2774 idev->if_flags |= IF_READY;
2775 }
2776
f3213831
JP		 2777 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2778 dev->name);
3c21edbd 2779
c5e33bdd 2780 run_pending = 1;
3c21edbd
YH		 2781 }
2782
e21e8467 2783 switch (dev->type) {
07a93626 2784#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2785 case ARPHRD_SIT:
2786 addrconf_sit_config(dev);
2787 break;
aee80b54 2788#endif
07a93626 2789#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2790 case ARPHRD_IPGRE:
2791 addrconf_gre_config(dev);
2792 break;
0be669bb 2793#endif
1da177e4
LT		 2794 case ARPHRD_TUNNEL6:
2795 addrconf_ip6_tnl_config(dev);
2796 break;
2797 case ARPHRD_LOOPBACK:
2798 init_loopback(dev);
2799 break;
2800
2801 default:
2802 addrconf_dev_config(dev);
2803 break;
3ff50b79 2804 }
bcdd553f 2805
1da177e4 2806 if (idev) {
c5e33bdd
YH		 2807 if (run_pending)
2808 addrconf_dad_run(idev);
2809
bcdd553f
SH		 2810 /*
2811 * If the MTU changed during the interface down,
2812 * when the interface up, the changed MTU must be
2813 * reflected in the idev as well as routers.
1da177e4 2814 */
bcdd553f
SH		 2815 if (idev->cnf.mtu6 != dev->mtu &&
2816 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2817 rt6_mtu_change(dev, dev->mtu);
2818 idev->cnf.mtu6 = dev->mtu;
2819 }
2820 idev->tstamp = jiffies;
2821 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2822
2823 /*
2824 * If the changed mtu during down is lower than
2825 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2826 */
2827 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2828 addrconf_ifdown(dev, 1);
1da177e4
LT		 2829 }
2830 break;
2831
2832 case NETDEV_CHANGEMTU:
d31c7b8f 2833 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2834 rt6_mtu_change(dev, dev->mtu);
2835 idev->cnf.mtu6 = dev->mtu;
2836 break;
2837 }
2838
d31c7b8f
EP		 2839 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2840 idev = ipv6_add_dev(dev);
2841 if (idev)
2842 break;
2843 }
2844
bcdd553f
SH		 2845 /*
2846 * MTU falled under IPV6_MIN_MTU.
2847 * Stop IPv6 on this interface.
2848 */
1da177e4
LT		 2849
2850 case NETDEV_DOWN:
2851 case NETDEV_UNREGISTER:
2852 /*
2853 * Remove all addresses from this interface.
2854 */
2855 addrconf_ifdown(dev, event != NETDEV_DOWN);
2856 break;
3c21edbd 2857
1da177e4 2858 case NETDEV_CHANGENAME:
1da177e4 2859 if (idev) {
5632c515 2860 snmp6_unregister_dev(idev);
408c4768 2861 addrconf_sysctl_unregister(idev);
f52295a9 2862 addrconf_sysctl_register(idev);
b217d616
HX		 2863 err = snmp6_register_dev(idev);
2864 if (err)
2865 return notifier_from_errno(err);
5632c515 2866 }
1da177e4 2867 break;
bcdd553f 2868
93d9b7d7
JP		 2869 case NETDEV_PRE_TYPE_CHANGE:
2870 case NETDEV_POST_TYPE_CHANGE:
2871 addrconf_type_change(dev, event);
75c78500 2872 break;
3ff50b79 2873 }
1da177e4
LT		 2874
2875 return NOTIFY_OK;
2876}
2877
2878/*
2879 * addrconf module should be notified of a device going up
2880 */
2881static struct notifier_block ipv6_dev_notf = {
2882 .notifier_call = addrconf_notify,
1da177e4
LT		 2883};
2884
93d9b7d7 2885static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2886{
2887 struct inet6_dev *idev;
2888 ASSERT_RTNL();
2889
2890 idev = __in6_dev_get(dev);
2891
93d9b7d7 2892 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2893 ipv6_mc_remap(idev);
93d9b7d7 2894 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2895 ipv6_mc_unmap(idev);
2896}
2897
1da177e4
LT		 2898static int addrconf_ifdown(struct net_device *dev, int how)
2899{
c346dca1 2900 struct net *net = dev_net(dev);
502a2ffd 2901 struct inet6_dev *idev;
2902 struct inet6_ifaddr *ifa;
73a8bd74 2903 int state, i;
1da177e4
LT		 2904
2905 ASSERT_RTNL();
2906
73a8bd74
DM		 2907 rt6_ifdown(net, dev);
2908 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 2909
2910 idev = __in6_dev_get(dev);
2911 if (idev == NULL)
2912 return -ENODEV;
2913
bcdd553f
SH		 2914 /*
2915 * Step 1: remove reference to ipv6 device from parent device.
2916 * Do not dev_put!
1da177e4 2917 */
439e2385 2918 if (how) {
1da177e4 2919 idev->dead = 1;
8814c4b5
YH		 2920
2921 /* protected by rtnl_lock */
a9b3cd7f 2922 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 2923
2924 /* Step 1.5: remove snmp6 entry */
2925 snmp6_unregister_dev(idev);
2926
2927 }
2928
73a8bd74
DM		 2929 /* Step 2: clear hash table */
2930 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2931 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 2932
2933 spin_lock_bh(&addrconf_hash_lock);
2934 restart:
b67bfe0d 2935 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74
DM		 2936 if (ifa->idev == idev) {
2937 hlist_del_init_rcu(&ifa->addr_lst);
2938 addrconf_del_timer(ifa);
2939 goto restart;
2940 }
2941 }
2942 spin_unlock_bh(&addrconf_hash_lock);
2943 }
2944
1da177e4
LT		 2945 write_lock_bh(&idev->lock);
2946
bcdd553f 2947 /* Step 2: clear flags for stateless addrconf */
439e2385 2948 if (!how)
3c21edbd 2949 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 2950
1da177e4 2951#ifdef CONFIG_IPV6_PRIVACY
439e2385 2952 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2953 in6_dev_put(idev);
2954
bcdd553f 2955 /* Step 3: clear tempaddr list */
372e6c8f 2956 while (!list_empty(&idev->tempaddr_list)) {
2957 ifa = list_first_entry(&idev->tempaddr_list,
2958 struct inet6_ifaddr, tmp_list);
2959 list_del(&ifa->tmp_list);
1da177e4
LT		 2960 write_unlock_bh(&idev->lock);
2961 spin_lock_bh(&ifa->lock);
2962
2963 if (ifa->ifpub) {
2964 in6_ifa_put(ifa->ifpub);
2965 ifa->ifpub = NULL;
2966 }
2967 spin_unlock_bh(&ifa->lock);
2968 in6_ifa_put(ifa);
2969 write_lock_bh(&idev->lock);
2970 }
2971#endif
8f37ada5 2972
502a2ffd 2973 while (!list_empty(&idev->addr_list)) {
2974 ifa = list_first_entry(&idev->addr_list,
2975 struct inet6_ifaddr, if_list);
84e8b803 2976 addrconf_del_timer(ifa);
2977
73a8bd74 2978 list_del(&ifa->if_list);
84e8b803 2979
73a8bd74 2980 write_unlock_bh(&idev->lock);
84e8b803 2981
73a8bd74
DM		 2982 spin_lock_bh(&ifa->state_lock);
2983 state = ifa->state;
2984 ifa->state = INET6_IFADDR_STATE_DEAD;
2985 spin_unlock_bh(&ifa->state_lock);
9d82ca98 2986
73a8bd74
DM		 2987 if (state != INET6_IFADDR_STATE_DEAD) {
2988 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 2989 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 2990 }
73a8bd74 2991 in6_ifa_put(ifa);
8f37ada5 2992
73a8bd74
DM		 2993 write_lock_bh(&idev->lock);
2994 }
8f37ada5 2995
1da177e4
LT		 2996 write_unlock_bh(&idev->lock);
2997
2998 /* Step 5: Discard multicast list */
439e2385 2999 if (how)
1da177e4
LT		 3000 ipv6_mc_destroy_dev(idev);
3001 else
3002 ipv6_mc_down(idev);
3003
1da177e4 3004 idev->tstamp = jiffies;
1ab1457c 3005
bcdd553f 3006 /* Last: Shot the device (if unregistered) */
439e2385 3007 if (how) {
408c4768 3008 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3009 neigh_parms_release(&nd_tbl, idev->nd_parms);
3010 neigh_ifdown(&nd_tbl, dev);
3011 in6_dev_put(idev);
3012 }
3013 return 0;
3014}
3015
3016static void addrconf_rs_timer(unsigned long data)
3017{
3018 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
5b2a1953 3019 struct inet6_dev *idev = ifp->idev;
1da177e4 3020
5b2a1953 3021 read_lock(&idev->lock);
3022 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3023 goto out;
3024
9ba2add3 3025 if (!ipv6_accept_ra(idev))
5b2a1953 3026 goto out;
3027
3028 /* Announcement received after solicitation was sent */
3029 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3030 goto out;
1da177e4
LT		 3031
3032 spin_lock(&ifp->lock);
5b2a1953 3033 if (ifp->probes++ < idev->cnf.rtr_solicits) {
1da177e4
LT		 3034 /* The wait after the last probe can be shorter */
3035 addrconf_mod_timer(ifp, AC_RS,
5b2a1953 3036 (ifp->probes == idev->cnf.rtr_solicits) ?
3037 idev->cnf.rtr_solicit_delay :
3038 idev->cnf.rtr_solicit_interval);
1da177e4
LT		 3039 spin_unlock(&ifp->lock);
3040
5b2a1953 3041 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 3042 } else {
3043 spin_unlock(&ifp->lock);
3044 /*
3045 * Note: we do not support deprecated "all on-link"
3046 * assumption any longer.
3047 */
91df42be 3048 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3049 }
3050
3051out:
5b2a1953 3052 read_unlock(&idev->lock);
1da177e4
LT		 3053 in6_ifa_put(ifp);
3054}
3055
3056/*
3057 * Duplicate Address Detection
3058 */
3c21edbd
YH		 3059static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3060{
3061 unsigned long rand_num;
3062 struct inet6_dev *idev = ifp->idev;
3063
95c385b4
NH		 3064 if (ifp->flags & IFA_F_OPTIMISTIC)
3065 rand_num = 0;
3066 else
3067 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3068
3c21edbd
YH		 3069 ifp->probes = idev->cnf.dad_transmits;
3070 addrconf_mod_timer(ifp, AC_DAD, rand_num);
3071}
3072
cf22f9a2 3073static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4
LT		 3074{
3075 struct inet6_dev *idev = ifp->idev;
3076 struct net_device *dev = idev->dev;
1da177e4
LT		 3077
3078 addrconf_join_solict(dev, &ifp->addr);
3079
1da177e4 3080 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 3081
3082 read_lock_bh(&idev->lock);
622ccdf1 3083 spin_lock(&ifp->lock);
e9d3e084 3084 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3085 goto out;
1da177e4
LT		 3086
3087 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3088 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3089 !(ifp->flags&IFA_F_TENTATIVE) ||
3090 ifp->flags & IFA_F_NODAD) {
cc411d0b 3091 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3092 spin_unlock(&ifp->lock);
1da177e4
LT		 3093 read_unlock_bh(&idev->lock);
3094
3095 addrconf_dad_completed(ifp);
3096 return;
3097 }
3098
6732bade 3099 if (!(idev->if_flags & IF_READY)) {
21809faf 3100 spin_unlock(&ifp->lock);
6732bade 3101 read_unlock_bh(&idev->lock);
3c21edbd 3102 /*
590a9887 3103 * If the device is not ready:
3c21edbd
YH		 3104 * - keep it tentative if it is a permanent address.
3105 * - otherwise, kill it.
3106 */
3107 in6_ifa_hold(ifp);
cc411d0b 3108 addrconf_dad_stop(ifp, 0);
6732bade 3109 return;
3c21edbd 3110 }
95c385b4
NH		 3111
3112 /*
3113 * Optimistic nodes can start receiving
3114 * Frames right away
3115 */
e21e8467 3116 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 3117 ip6_ins_rt(ifp->rt);
3118
6732bade 3119 addrconf_dad_kick(ifp);
1da177e4 3120out:
622ccdf1 3121 spin_unlock(&ifp->lock);
1da177e4
LT		 3122 read_unlock_bh(&idev->lock);
3123}
3124
3125static void addrconf_dad_timer(unsigned long data)
3126{
3127 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3128 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3129 struct in6_addr mcaddr;
3130
f2344a13
HX		 3131 if (!ifp->probes && addrconf_dad_end(ifp))
3132 goto out;
3133
122e4519 3134 read_lock(&idev->lock);
3135 if (idev->dead || !(idev->if_flags & IF_READY)) {
3136 read_unlock(&idev->lock);
1da177e4
LT		 3137 goto out;
3138 }
21809faf 3139
3140 spin_lock(&ifp->lock);
622ccdf1
HX		 3141 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3142 spin_unlock(&ifp->lock);
3143 read_unlock(&idev->lock);
3144 goto out;
3145 }
3146
1da177e4
LT		 3147 if (ifp->probes == 0) {
3148 /*
3149 * DAD was successful
3150 */
3151
cc411d0b 3152 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3153 spin_unlock(&ifp->lock);
122e4519 3154 read_unlock(&idev->lock);
1da177e4
LT		 3155
3156 addrconf_dad_completed(ifp);
3157
3158 goto out;
3159 }
3160
3161 ifp->probes--;
3162 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
21809faf 3163 spin_unlock(&ifp->lock);
122e4519 3164 read_unlock(&idev->lock);
1da177e4
LT		 3165
3166 /* send a neighbour solicitation for our addr */
1da177e4 3167 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3168 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3169out:
3170 in6_ifa_put(ifp);
3171}
3172
3173static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3174{
e21e8467 3175 struct net_device *dev = ifp->idev->dev;
1da177e4
LT		 3176
3177 /*
3178 * Configure the address for reception. Now it is valid.
3179 */
3180
3181 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3182
026359bc
TA		 3183 /* If added prefix is link local and we are prepared to process
3184 router advertisements, start sending router solicitations.
1da177e4
LT		 3185 */
3186
aeaf6e9d 3187 if (ipv6_accept_ra(ifp->idev) &&
1da177e4
LT		 3188 ifp->idev->cnf.rtr_solicits > 0 &&
3189 (dev->flags&IFF_LOOPBACK) == 0 &&
3190 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 3191 /*
3192 * If a host as already performed a random delay
3193 * [...] as part of DAD [...] there is no need
3194 * to delay again before sending the first RS
3195 */
f3ee4010 3196 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 3197
3198 spin_lock_bh(&ifp->lock);
3199 ifp->probes = 1;
3200 ifp->idev->if_flags |= IF_RS_SENT;
3201 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3202 spin_unlock_bh(&ifp->lock);
3203 }
3204}
3205
e21e8467
SH		 3206static void addrconf_dad_run(struct inet6_dev *idev)
3207{
c5e33bdd
YH		 3208 struct inet6_ifaddr *ifp;
3209
3210 read_lock_bh(&idev->lock);
502a2ffd 3211 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3212 spin_lock(&ifp->lock);
f2344a13
HX		 3213 if (ifp->flags & IFA_F_TENTATIVE &&
3214 ifp->state == INET6_IFADDR_STATE_DAD)
3215 addrconf_dad_kick(ifp);
21809faf 3216 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3217 }
3218 read_unlock_bh(&idev->lock);
3219}
3220
1da177e4
LT		 3221#ifdef CONFIG_PROC_FS
3222struct if6_iter_state {
3c40090a 3223 struct seq_net_private p;
1da177e4 3224 int bucket;
1d578303 3225 int offset;
1da177e4
LT		 3226};
3227
1d578303 3228static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3229{
3230 struct inet6_ifaddr *ifa = NULL;
3231 struct if6_iter_state *state = seq->private;
1218854a 3232 struct net *net = seq_file_net(seq);
1d578303 3233 int p = 0;
1da177e4 3234
1d578303
MM		 3235 /* initial bucket if pos is 0 */
3236 if (pos == 0) {
3237 state->bucket = 0;
3238 state->offset = 0;
3239 }
3240
3241 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3242 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3243 addr_lst) {
9f0d3c27
ED		 3244 if (!net_eq(dev_net(ifa->idev->dev), net))
3245 continue;
1d578303
MM		 3246 /* sync with offset */
3247 if (p < state->offset) {
3248 p++;
3249 continue;
3250 }
3251 state->offset++;
9f0d3c27 3252 return ifa;
1d578303
MM		 3253 }
3254
3255 /* prepare for next bucket */
3256 state->offset = 0;
3257 p = 0;
1da177e4 3258 }
c2e21293 3259 return NULL;
1da177e4
LT		 3260}
3261
c2e21293 3262static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3263 struct inet6_ifaddr *ifa)
1da177e4
LT		 3264{
3265 struct if6_iter_state *state = seq->private;
1218854a 3266 struct net *net = seq_file_net(seq);
1da177e4 3267
b67bfe0d 3268 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3269 if (!net_eq(dev_net(ifa->idev->dev), net))
3270 continue;
1d578303 3271 state->offset++;
9f0d3c27 3272 return ifa;
1d578303 3273 }
3c40090a 3274
c2e21293 3275 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3276 state->offset = 0;
b67bfe0d 3277 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3278 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3279 if (!net_eq(dev_net(ifa->idev->dev), net))
3280 continue;
1d578303 3281 state->offset++;
9f0d3c27 3282 return ifa;
c2e21293 3283 }
1da177e4 3284 }
3c40090a 3285
c2e21293 3286 return NULL;
1da177e4
LT		 3287}
3288
1da177e4 3289static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3290 __acquires(rcu_bh)
1da177e4 3291{
5c578aed 3292 rcu_read_lock_bh();
1d578303 3293 return if6_get_first(seq, *pos);
1da177e4
LT		 3294}
3295
3296static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3297{
3298 struct inet6_ifaddr *ifa;
3299
3300 ifa = if6_get_next(seq, v);
3301 ++*pos;
3302 return ifa;
3303}
3304
3305static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3306 __releases(rcu_bh)
1da177e4 3307{
5c578aed 3308 rcu_read_unlock_bh();
1da177e4
LT		 3309}
3310
3311static int if6_seq_show(struct seq_file *seq, void *v)
3312{
3313 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3314 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3315 &ifp->addr,
1da177e4
LT		 3316 ifp->idev->dev->ifindex,
3317 ifp->prefix_len,
3318 ifp->scope,
3319 ifp->flags,
3320 ifp->idev->dev->name);
3321 return 0;
3322}
3323
56b3d975 3324static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3325 .start = if6_seq_start,
3326 .next = if6_seq_next,
3327 .show = if6_seq_show,
3328 .stop = if6_seq_stop,
3329};
3330
3331static int if6_seq_open(struct inode *inode, struct file *file)
3332{
3c40090a
DL		 3333 return seq_open_net(inode, file, &if6_seq_ops,
3334 sizeof(struct if6_iter_state));
1da177e4
LT		 3335}
3336
9a32144e 3337static const struct file_operations if6_fops = {
1da177e4
LT		 3338 .owner = THIS_MODULE,
3339 .open = if6_seq_open,
3340 .read = seq_read,
3341 .llseek = seq_lseek,
3c40090a 3342 .release = seq_release_net,
1da177e4
LT		 3343};
3344
2c8c1e72 3345static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3346{
d4beaa66 3347 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 3348 return -ENOMEM;
3349 return 0;
3350}
3351
2c8c1e72 3352static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 3353{
ece31ffd 3354 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 3355}
3356
3357static struct pernet_operations if6_proc_net_ops = {
3358 .init = if6_proc_net_init,
3359 .exit = if6_proc_net_exit,
3360};
3361
3362int __init if6_proc_init(void)
3363{
3364 return register_pernet_subsys(&if6_proc_net_ops);
3365}
3366
1da177e4
LT		 3367void if6_proc_exit(void)
3368{
3c40090a 3369 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3370}
3371#endif /* CONFIG_PROC_FS */
3372
07a93626 3373#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3374/* Check if address is a home address configured on any interface. */
b71d1d42 3375int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3376{
3377 int ret = 0;
c2e21293 3378 struct inet6_ifaddr *ifp = NULL;
ddbe5032 3379 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3380
5c578aed 3381 rcu_read_lock_bh();
b67bfe0d 3382 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 3383 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3384 continue;
caad295f 3385 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3386 (ifp->flags & IFA_F_HOMEADDRESS)) {
3387 ret = 1;
3388 break;
3389 }
3390 }
5c578aed 3391 rcu_read_unlock_bh();
3b9f9a1c
NT		 3392 return ret;
3393}
3394#endif
3395
1da177e4
LT		 3396/*
3397 * Periodic address status verification
3398 */
3399
3400static void addrconf_verify(unsigned long foo)
3401{
b2db7564 3402 unsigned long now, next, next_sec, next_sched;
1da177e4 3403 struct inet6_ifaddr *ifp;
1da177e4
LT		 3404 int i;
3405
5c578aed 3406 rcu_read_lock_bh();
3407 spin_lock(&addrconf_verify_lock);
1da177e4 3408 now = jiffies;
b2db7564 3409 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4
LT		 3410
3411 del_timer(&addr_chk_timer);
3412
bcdd553f 3413 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3414restart:
b67bfe0d 3415 hlist_for_each_entry_rcu_bh(ifp,
5c578aed 3416 &inet6_addr_lst[i], addr_lst) {
1da177e4 3417 unsigned long age;
1da177e4
LT		 3418
3419 if (ifp->flags & IFA_F_PERMANENT)
3420 continue;
3421
3422 spin_lock(&ifp->lock);
b2db7564
YH		 3423 /* We try to batch several events at once. */
3424 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3425
8f27ebb9
YH		 3426 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3427 age >= ifp->valid_lft) {
1da177e4
LT		 3428 spin_unlock(&ifp->lock);
3429 in6_ifa_hold(ifp);
1da177e4
LT		 3430 ipv6_del_addr(ifp);
3431 goto restart;
8f27ebb9
YH		 3432 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3433 spin_unlock(&ifp->lock);
3434 continue;
1da177e4 3435 } else if (age >= ifp->prefered_lft) {
a1ed0526 3436 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3437 int deprecate = 0;
3438
3439 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3440 deprecate = 1;
3441 ifp->flags |= IFA_F_DEPRECATED;
3442 }
3443
3444 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3445 next = ifp->tstamp + ifp->valid_lft * HZ;
3446
3447 spin_unlock(&ifp->lock);
3448
3449 if (deprecate) {
3450 in6_ifa_hold(ifp);
1da177e4
LT		 3451
3452 ipv6_ifa_notify(0, ifp);
3453 in6_ifa_put(ifp);
3454 goto restart;
3455 }
3456#ifdef CONFIG_IPV6_PRIVACY
3457 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3458 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3459 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3460 ifp->idev->cnf.dad_transmits *
3461 ifp->idev->nd_parms->retrans_time / HZ;
3462
1da177e4
LT		 3463 if (age >= ifp->prefered_lft - regen_advance) {
3464 struct inet6_ifaddr *ifpub = ifp->ifpub;
3465 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3466 next = ifp->tstamp + ifp->prefered_lft * HZ;
3467 if (!ifp->regen_count && ifpub) {
3468 ifp->regen_count++;
3469 in6_ifa_hold(ifp);
3470 in6_ifa_hold(ifpub);
3471 spin_unlock(&ifp->lock);
5c578aed 3472
291d809b
HY		 3473 spin_lock(&ifpub->lock);
3474 ifpub->regen_count = 0;
3475 spin_unlock(&ifpub->lock);
1da177e4
LT		 3476 ipv6_create_tempaddr(ifpub, ifp);
3477 in6_ifa_put(ifpub);
3478 in6_ifa_put(ifp);
3479 goto restart;
3480 }
3481 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3482 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3483 spin_unlock(&ifp->lock);
3484#endif
3485 } else {
3486 /* ifp->prefered_lft <= ifp->valid_lft */
3487 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3488 next = ifp->tstamp + ifp->prefered_lft * HZ;
3489 spin_unlock(&ifp->lock);
3490 }
3491 }
1da177e4
LT		 3492 }
3493
b2db7564
YH		 3494 next_sec = round_jiffies_up(next);
3495 next_sched = next;
3496
3497 /* If rounded timeout is accurate enough, accept it. */
3498 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3499 next_sched = next_sec;
3500
3501 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3502 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3503 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3504
3505 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3506 now, next, next_sec, next_sched));
3507
3508 addr_chk_timer.expires = next_sched;
1da177e4 3509 add_timer(&addr_chk_timer);
5c578aed 3510 spin_unlock(&addrconf_verify_lock);
3511 rcu_read_unlock_bh();
1da177e4
LT		 3512}
3513
461d8837
TG		 3514static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3515{
3516 struct in6_addr *pfx = NULL;
3517
3518 if (addr)
3519 pfx = nla_data(addr);
3520
3521 if (local) {
3522 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3523 pfx = NULL;
3524 else
3525 pfx = nla_data(local);
3526 }
3527
3528 return pfx;
3529}
3530
ef7c79ed 3531static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3532 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3533 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3534 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3535};
3536
1da177e4
LT		 3537static int
3538inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3539{
3b1e0a65 3540 struct net *net = sock_net(skb->sk);
b933f716
TG		 3541 struct ifaddrmsg *ifm;
3542 struct nlattr *tb[IFA_MAX+1];
1da177e4 3543 struct in6_addr *pfx;
b933f716 3544 int err;
1da177e4 3545
b933f716
TG		 3546 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3547 if (err < 0)
3548 return err;
3549
3550 ifm = nlmsg_data(nlh);
3551 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3552 if (pfx == NULL)
3553 return -EINVAL;
3554
af284937 3555 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3556}
3557
55ebaef1
NT		 3558static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3559 u32 prefered_lft, u32 valid_lft)
081bba5b 3560{
6f704992
YH		 3561 u32 flags;
3562 clock_t expires;
4bed72e4 3563 unsigned long timeout;
46d48046 3564
081bba5b
NT		 3565 if (!valid_lft || (prefered_lft > valid_lft))
3566 return -EINVAL;
3567
4bed72e4
YH		 3568 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3569 if (addrconf_finite_timeout(timeout)) {
3570 expires = jiffies_to_clock_t(timeout * HZ);
3571 valid_lft = timeout;
6f704992 3572 flags = RTF_EXPIRES;
4bed72e4
YH		 3573 } else {
3574 expires = 0;
3575 flags = 0;
3576 ifa_flags |= IFA_F_PERMANENT;
6f704992 3577 }
081bba5b 3578
4bed72e4
YH		 3579 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3580 if (addrconf_finite_timeout(timeout)) {
3581 if (timeout == 0)
3582 ifa_flags |= IFA_F_DEPRECATED;
3583 prefered_lft = timeout;
3584 }
081bba5b
NT		 3585
3586 spin_lock_bh(&ifp->lock);
3b9f9a1c 3587 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3588 ifp->tstamp = jiffies;
3589 ifp->valid_lft = valid_lft;
3590 ifp->prefered_lft = prefered_lft;
3591
3592 spin_unlock_bh(&ifp->lock);
3593 if (!(ifp->flags&IFA_F_TENTATIVE))
3594 ipv6_ifa_notify(0, ifp);
081bba5b 3595
46d48046 3596 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3597 expires, flags);
081bba5b
NT		 3598 addrconf_verify(0);
3599
3600 return 0;
3601}
3602
1da177e4
LT		 3603static int
3604inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3605{
3b1e0a65 3606 struct net *net = sock_net(skb->sk);
461d8837
TG		 3607 struct ifaddrmsg *ifm;
3608 struct nlattr *tb[IFA_MAX+1];
1da177e4 3609 struct in6_addr *pfx;
7198f8ce
TG		 3610 struct inet6_ifaddr *ifa;
3611 struct net_device *dev;
55ebaef1
NT		 3612 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3613 u8 ifa_flags;
461d8837 3614 int err;
1da177e4 3615
461d8837
TG		 3616 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3617 if (err < 0)
3618 return err;
3619
3620 ifm = nlmsg_data(nlh);
3621 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3622 if (pfx == NULL)
3623 return -EINVAL;
3624
461d8837 3625 if (tb[IFA_CACHEINFO]) {
0778769d 3626 struct ifa_cacheinfo *ci;
461d8837
TG		 3627
3628 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3629 valid_lft = ci->ifa_valid;
461d8837
TG		 3630 preferred_lft = ci->ifa_prefered;
3631 } else {
3632 preferred_lft = INFINITY_LIFE_TIME;
3633 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3634 }
3635
af284937 3636 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3637 if (dev == NULL)
3638 return -ENODEV;
3639
55ebaef1 3640 /* We ignore other flags so far. */
3b9f9a1c 3641 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3642
1cab3da6 3643 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3644 if (ifa == NULL) {
3645 /*
3646 * It would be best to check for !NLM_F_CREATE here but
3647 * userspace alreay relies on not having to provide this.
3648 */
af284937
DL		 3649 return inet6_addr_add(net, ifm->ifa_index, pfx,
3650 ifm->ifa_prefixlen, ifa_flags,
3651 preferred_lft, valid_lft);
081bba5b
NT		 3652 }
3653
7198f8ce
TG		 3654 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3655 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3656 err = -EEXIST;
3657 else
55ebaef1 3658 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3659
3660 in6_ifa_put(ifa);
3661
3662 return err;
1da177e4
LT		 3663}
3664
101bb229
TG		 3665static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3666 u8 scope, int ifindex)
3667{
3668 struct ifaddrmsg *ifm;
3669
3670 ifm = nlmsg_data(nlh);
3671 ifm->ifa_family = AF_INET6;
3672 ifm->ifa_prefixlen = prefixlen;
3673 ifm->ifa_flags = flags;
3674 ifm->ifa_scope = scope;
3675 ifm->ifa_index = ifindex;
3676}
3677
85486af0
TG		 3678static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3679 unsigned long tstamp, u32 preferred, u32 valid)
3680{
3681 struct ifa_cacheinfo ci;
3682
18a31e1e
TG		 3683 ci.cstamp = cstamp_delta(cstamp);
3684 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 3685 ci.ifa_prefered = preferred;
3686 ci.ifa_valid = valid;
3687
3688 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3689}
3690
101bb229
TG		 3691static inline int rt_scope(int ifa_scope)
3692{
3693 if (ifa_scope & IFA_HOST)
3694 return RT_SCOPE_HOST;
3695 else if (ifa_scope & IFA_LINK)
3696 return RT_SCOPE_LINK;
3697 else if (ifa_scope & IFA_SITE)
3698 return RT_SCOPE_SITE;
3699 else
3700 return RT_SCOPE_UNIVERSE;
3701}
3702
0ab6803b
TG		 3703static inline int inet6_ifaddr_msgsize(void)
3704{
339bf98f
TG		 3705 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3706 + nla_total_size(16) /* IFA_ADDRESS */
3707 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3708}
c5396a31 3709
1da177e4 3710static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 3711 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3712{
1da177e4 3713 struct nlmsghdr *nlh;
85486af0 3714 u32 preferred, valid;
1da177e4 3715
15e47304 3716 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3717 if (nlh == NULL)
26932566 3718 return -EMSGSIZE;
0ab6803b 3719
101bb229
TG		 3720 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3721 ifa->idev->dev->ifindex);
3722
1da177e4 3723 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3724 preferred = ifa->prefered_lft;
3725 valid = ifa->valid_lft;
3726 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3727 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3728 if (preferred > tval)
3729 preferred -= tval;
3730 else
3731 preferred = 0;
f56619fc
BH		 3732 if (valid != INFINITY_LIFE_TIME) {
3733 if (valid > tval)
3734 valid -= tval;
3735 else
3736 valid = 0;
3737 }
1da177e4
LT		 3738 }
3739 } else {
85486af0
TG		 3740 preferred = INFINITY_LIFE_TIME;
3741 valid = INFINITY_LIFE_TIME;
3742 }
3743
0ab6803b 3744 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3745 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3746 nlmsg_cancel(skb, nlh);
3747 return -EMSGSIZE;
3748 }
1da177e4 3749
0ab6803b 3750 return nlmsg_end(skb, nlh);
1da177e4
LT		 3751}
3752
3753static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 3754 u32 portid, u32 seq, int event, u16 flags)
1da177e4 3755{
1da177e4 3756 struct nlmsghdr *nlh;
101bb229
TG		 3757 u8 scope = RT_SCOPE_UNIVERSE;
3758 int ifindex = ifmca->idev->dev->ifindex;
3759
3760 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3761 scope = RT_SCOPE_SITE;
1da177e4 3762
15e47304 3763 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3764 if (nlh == NULL)
26932566 3765 return -EMSGSIZE;
85486af0 3766
0ab6803b
TG		 3767 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3768 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3769 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3770 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3771 nlmsg_cancel(skb, nlh);
3772 return -EMSGSIZE;
3773 }
85486af0 3774
0ab6803b 3775 return nlmsg_end(skb, nlh);
1da177e4
LT		 3776}
3777
3778static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 3779 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3780{
1da177e4 3781 struct nlmsghdr *nlh;
101bb229
TG		 3782 u8 scope = RT_SCOPE_UNIVERSE;
3783 int ifindex = ifaca->aca_idev->dev->ifindex;
3784
3785 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3786 scope = RT_SCOPE_SITE;
1da177e4 3787
15e47304 3788 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3789 if (nlh == NULL)
26932566 3790 return -EMSGSIZE;
85486af0 3791
0ab6803b
TG		 3792 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3793 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3794 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3795 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3796 nlmsg_cancel(skb, nlh);
3797 return -EMSGSIZE;
3798 }
1da177e4 3799
0ab6803b 3800 return nlmsg_end(skb, nlh);
1da177e4
LT		 3801}
3802
e21e8467 3803enum addr_type_t {
1da177e4
LT		 3804 UNICAST_ADDR,
3805 MULTICAST_ADDR,
3806 ANYCAST_ADDR,
3807};
3808
234b27c3
ED		 3809/* called with rcu_read_lock() */
3810static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3811 struct netlink_callback *cb, enum addr_type_t type,
3812 int s_ip_idx, int *p_ip_idx)
3813{
234b27c3
ED		 3814 struct ifmcaddr6 *ifmca;
3815 struct ifacaddr6 *ifaca;
3816 int err = 1;
3817 int ip_idx = *p_ip_idx;
3818
3819 read_lock_bh(&idev->lock);
3820 switch (type) {
502a2ffd 3821 case UNICAST_ADDR: {
3822 struct inet6_ifaddr *ifa;
3823
234b27c3 3824 /* unicast address incl. temp addr */
502a2ffd 3825 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3826 if (++ip_idx < s_ip_idx)
234b27c3
ED		 3827 continue;
3828 err = inet6_fill_ifaddr(skb, ifa,
15e47304 3829 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3830 cb->nlh->nlmsg_seq,
3831 RTM_NEWADDR,
3832 NLM_F_MULTI);
3833 if (err <= 0)
3834 break;
3835 }
3836 break;
502a2ffd 3837 }
234b27c3
ED		 3838 case MULTICAST_ADDR:
3839 /* multicast address */
3840 for (ifmca = idev->mc_list; ifmca;
3841 ifmca = ifmca->next, ip_idx++) {
3842 if (ip_idx < s_ip_idx)
3843 continue;
3844 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 3845 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3846 cb->nlh->nlmsg_seq,
3847 RTM_GETMULTICAST,
3848 NLM_F_MULTI);
3849 if (err <= 0)
3850 break;
3851 }
3852 break;
3853 case ANYCAST_ADDR:
3854 /* anycast address */
3855 for (ifaca = idev->ac_list; ifaca;
3856 ifaca = ifaca->aca_next, ip_idx++) {
3857 if (ip_idx < s_ip_idx)
3858 continue;
3859 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 3860 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3861 cb->nlh->nlmsg_seq,
3862 RTM_GETANYCAST,
3863 NLM_F_MULTI);
3864 if (err <= 0)
3865 break;
3866 }
3867 break;
3868 default:
3869 break;
3870 }
3871 read_unlock_bh(&idev->lock);
3872 *p_ip_idx = ip_idx;
3873 return err;
3874}
3875
1da177e4
LT		 3876static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3877 enum addr_type_t type)
3878{
234b27c3
ED		 3879 struct net *net = sock_net(skb->sk);
3880 int h, s_h;
1da177e4
LT		 3881 int idx, ip_idx;
3882 int s_idx, s_ip_idx;
1da177e4 3883 struct net_device *dev;
234b27c3
ED		 3884 struct inet6_dev *idev;
3885 struct hlist_head *head;
1ab1457c 3886
234b27c3
ED		 3887 s_h = cb->args[0];
3888 s_idx = idx = cb->args[1];
3889 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 3890
234b27c3
ED		 3891 rcu_read_lock();
3892 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3893 idx = 0;
3894 head = &net->dev_index_head[h];
b67bfe0d 3895 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 3896 if (idx < s_idx)
3897 goto cont;
4b97efdf 3898 if (h > s_h || idx > s_idx)
234b27c3
ED		 3899 s_ip_idx = 0;
3900 ip_idx = 0;
e21e8467
SH		 3901 idev = __in6_dev_get(dev);
3902 if (!idev)
234b27c3
ED		 3903 goto cont;
3904
3905 if (in6_dump_addrs(idev, skb, cb, type,
3906 s_ip_idx, &ip_idx) <= 0)
3907 goto done;
7562f876 3908cont:
234b27c3
ED		 3909 idx++;
3910 }
1da177e4 3911 }
234b27c3
ED		 3912done:
3913 rcu_read_unlock();
3914 cb->args[0] = h;
3915 cb->args[1] = idx;
3916 cb->args[2] = ip_idx;
3917
1da177e4
LT		 3918 return skb->len;
3919}
3920
3921static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3922{
3923 enum addr_type_t type = UNICAST_ADDR;
b854272b 3924
1da177e4
LT		 3925 return inet6_dump_addr(skb, cb, type);
3926}
3927
3928static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3929{
3930 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3931
1da177e4
LT		 3932 return inet6_dump_addr(skb, cb, type);
3933}
3934
3935
3936static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3937{
3938 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3939
1da177e4
LT		 3940 return inet6_dump_addr(skb, cb, type);
3941}
3942
8e5e8f30 3943static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
1b29fc2c 3944 void *arg)
6c223828 3945{
3b1e0a65 3946 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3947 struct ifaddrmsg *ifm;
3948 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3949 struct in6_addr *addr = NULL;
3950 struct net_device *dev = NULL;
3951 struct inet6_ifaddr *ifa;
3952 struct sk_buff *skb;
6c223828
NT		 3953 int err;
3954
1b29fc2c
TG		 3955 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3956 if (err < 0)
3957 goto errout;
3958
3959 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3960 if (addr == NULL) {
3961 err = -EINVAL;
3962 goto errout;
6c223828 3963 }
6c223828 3964
1b29fc2c 3965 ifm = nlmsg_data(nlh);
6c223828 3966 if (ifm->ifa_index)
6fda7350 3967 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3968
e21e8467
SH		 3969 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3970 if (!ifa) {
1b29fc2c
TG		 3971 err = -EADDRNOTAVAIL;
3972 goto errout;
3973 }
6c223828 3974
e21e8467
SH		 3975 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3976 if (!skb) {
6c223828 3977 err = -ENOBUFS;
1b29fc2c 3978 goto errout_ifa;
6c223828
NT		 3979 }
3980
15e47304 3981 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 3982 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3983 if (err < 0) {
3984 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3985 WARN_ON(err == -EMSGSIZE);
3986 kfree_skb(skb);
3987 goto errout_ifa;
3988 }
15e47304 3989 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 3990errout_ifa:
6c223828 3991 in6_ifa_put(ifa);
1b29fc2c 3992errout:
6c223828 3993 return err;
6c223828
NT		 3994}
3995
1da177e4
LT		 3996static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3997{
3998 struct sk_buff *skb;
c346dca1 3999 struct net *net = dev_net(ifa->idev->dev);
5d620266 4000 int err = -ENOBUFS;
1da177e4 4001
0ab6803b 4002 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 4003 if (skb == NULL)
4004 goto errout;
4005
4006 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4007 if (err < 0) {
4008 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4009 WARN_ON(err == -EMSGSIZE);
4010 kfree_skb(skb);
4011 goto errout;
4012 }
1ce85fe4
PNA		 4013 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4014 return;
5d620266
TG		 4015errout:
4016 if (err < 0)
6fda7350 4017 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4018}
4019
b6f99a21 4020static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4021 __s32 *array, int bytes)
4022{
04561c1f
TG		 4023 BUG_ON(bytes < (DEVCONF_MAX * 4));
4024
1da177e4
LT		 4025 memset(array, 0, bytes);
4026 array[DEVCONF_FORWARDING] = cnf->forwarding;
4027 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4028 array[DEVCONF_MTU6] = cnf->mtu6;
4029 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4030 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4031 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4032 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4033 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4034 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4035 jiffies_to_msecs(cnf->rtr_solicit_interval);
4036 array[DEVCONF_RTR_SOLICIT_DELAY] =
4037 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4
LT		 4038 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4039#ifdef CONFIG_IPV6_PRIVACY
4040 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4041 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4042 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4043 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4044 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4045#endif
4046 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4047 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 4048 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4049#ifdef CONFIG_IPV6_ROUTER_PREF
4050 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4051 array[DEVCONF_RTR_PROBE_INTERVAL] =
4052 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4053#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4054 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4055#endif
930d6ff2 4056#endif
fbea49e1 4057 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4058 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4059#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4060 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4061#endif
7bc570c8
YH		 4062#ifdef CONFIG_IPV6_MROUTE
4063 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4064#endif
778d80be 4065 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4066 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4067 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4068 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
1da177e4
LT		 4069}
4070
b382b191
TG		 4071static inline size_t inet6_ifla6_size(void)
4072{
4073 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4074 + nla_total_size(sizeof(struct ifla_cacheinfo))
4075 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4076 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4077 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
4078}
4079
339bf98f
TG		 4080static inline size_t inet6_if_nlmsg_size(void)
4081{
4082 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4083 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4084 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4085 + nla_total_size(4) /* IFLA_MTU */
4086 + nla_total_size(4) /* IFLA_LINK */
b382b191 4087 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4088}
c5396a31 4089
be281e55 4090static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4091 int items, int bytes)
7f7d9a6b
HX		 4092{
4093 int i;
4094 int pad = bytes - sizeof(u64) * items;
4095 BUG_ON(pad < 0);
4096
4097 /* Use put_unaligned() because stats may not be aligned for u64. */
4098 put_unaligned(items, &stats[0]);
4099 for (i = 1; i < items; i++)
be281e55 4100 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4101
4102 memset(&stats[items], 0, pad);
4103}
4104
4ce3c183
ED		 4105static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4106 int items, int bytes, size_t syncpoff)
4107{
4108 int i;
4109 int pad = bytes - sizeof(u64) * items;
4110 BUG_ON(pad < 0);
4111
4112 /* Use put_unaligned() because stats may not be aligned for u64. */
4113 put_unaligned(items, &stats[0]);
4114 for (i = 1; i < items; i++)
4115 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4116
4117 memset(&stats[items], 0, pad);
4118}
4119
7f7d9a6b
HX		 4120static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4121 int bytes)
4122{
e21e8467 4123 switch (attrtype) {
7f7d9a6b 4124 case IFLA_INET6_STATS:
4ce3c183
ED		 4125 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4126 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4127 break;
4128 case IFLA_INET6_ICMP6STATS:
be281e55 4129 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4130 break;
4131 }
4132}
4133
b382b191
TG		 4134static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4135{
4136 struct nlattr *nla;
4137 struct ifla_cacheinfo ci;
4138
c78679e8
DM		 4139 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4140 goto nla_put_failure;
b382b191 4141 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4142 ci.tstamp = cstamp_delta(idev->tstamp);
4143 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4144 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
c78679e8
DM		 4145 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4146 goto nla_put_failure;
b382b191
TG		 4147 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4148 if (nla == NULL)
4149 goto nla_put_failure;
4150 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4151
4152 /* XXX - MC not implemented */
4153
4154 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4155 if (nla == NULL)
4156 goto nla_put_failure;
4157 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4158
4159 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4160 if (nla == NULL)
4161 goto nla_put_failure;
4162 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4163
4164 return 0;
4165
4166nla_put_failure:
4167 return -EMSGSIZE;
4168}
4169
4170static size_t inet6_get_link_af_size(const struct net_device *dev)
4171{
4172 if (!__in6_dev_get(dev))
4173 return 0;
4174
4175 return inet6_ifla6_size();
4176}
4177
4178static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4179{
4180 struct inet6_dev *idev = __in6_dev_get(dev);
4181
4182 if (!idev)
4183 return -ENODATA;
4184
4185 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4186 return -EMSGSIZE;
4187
4188 return 0;
4189}
4190
1ab1457c 4191static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4192 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4193{
04561c1f 4194 struct net_device *dev = idev->dev;
04561c1f
TG		 4195 struct ifinfomsg *hdr;
4196 struct nlmsghdr *nlh;
4197 void *protoinfo;
04561c1f 4198
15e47304 4199 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
04561c1f 4200 if (nlh == NULL)
26932566 4201 return -EMSGSIZE;
04561c1f
TG		 4202
4203 hdr = nlmsg_data(nlh);
4204 hdr->ifi_family = AF_INET6;
4205 hdr->__ifi_pad = 0;
4206 hdr->ifi_type = dev->type;
4207 hdr->ifi_index = dev->ifindex;
4208 hdr->ifi_flags = dev_get_flags(dev);
4209 hdr->ifi_change = 0;
4210
c78679e8
DM		 4211 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4212 (dev->addr_len &&
4213 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4214 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4215 (dev->ifindex != dev->iflink &&
4216 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4217 goto nla_put_failure;
04561c1f
TG		 4218 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4219 if (protoinfo == NULL)
4220 goto nla_put_failure;
1da177e4 4221
b382b191 4222 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4223 goto nla_put_failure;
1da177e4 4224
04561c1f
TG		 4225 nla_nest_end(skb, protoinfo);
4226 return nlmsg_end(skb, nlh);
1da177e4 4227
04561c1f 4228nla_put_failure:
26932566
PM		 4229 nlmsg_cancel(skb, nlh);
4230 return -EMSGSIZE;
1da177e4
LT		 4231}
4232
4233static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4234{
3b1e0a65 4235 struct net *net = sock_net(skb->sk);
84d2697d 4236 int h, s_h;
434a8a58 4237 int idx = 0, s_idx;
1da177e4
LT		 4238 struct net_device *dev;
4239 struct inet6_dev *idev;
84d2697d 4240 struct hlist_head *head;
1da177e4 4241
84d2697d
ED		 4242 s_h = cb->args[0];
4243 s_idx = cb->args[1];
4244
4245 rcu_read_lock();
4246 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4247 idx = 0;
4248 head = &net->dev_index_head[h];
b67bfe0d 4249 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 4250 if (idx < s_idx)
4251 goto cont;
4252 idev = __in6_dev_get(dev);
4253 if (!idev)
4254 goto cont;
4255 if (inet6_fill_ifinfo(skb, idev,
15e47304 4256 NETLINK_CB(cb->skb).portid,
84d2697d
ED		 4257 cb->nlh->nlmsg_seq,
4258 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4259 goto out;
7562f876 4260cont:
84d2697d
ED		 4261 idx++;
4262 }
1da177e4 4263 }
84d2697d
ED		 4264out:
4265 rcu_read_unlock();
4266 cb->args[1] = idx;
4267 cb->args[0] = h;
1da177e4
LT		 4268
4269 return skb->len;
4270}
4271
4272void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4273{
4274 struct sk_buff *skb;
c346dca1 4275 struct net *net = dev_net(idev->dev);
8d7a76c9 4276 int err = -ENOBUFS;
1ab1457c 4277
339bf98f 4278 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4279 if (skb == NULL)
4280 goto errout;
4281
4282 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4283 if (err < 0) {
4284 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4285 WARN_ON(err == -EMSGSIZE);
4286 kfree_skb(skb);
4287 goto errout;
4288 }
5f75a104 4289 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4290 return;
8d7a76c9
TG		 4291errout:
4292 if (err < 0)
5f75a104 4293 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4294}
4295
339bf98f
TG		 4296static inline size_t inet6_prefix_nlmsg_size(void)
4297{
4298 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4299 + nla_total_size(sizeof(struct in6_addr))
4300 + nla_total_size(sizeof(struct prefix_cacheinfo));
4301}
c5396a31 4302
1da177e4 4303static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4304 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 4305 int event, unsigned int flags)
1da177e4 4306{
6051e2f4
TG		 4307 struct prefixmsg *pmsg;
4308 struct nlmsghdr *nlh;
1da177e4
LT		 4309 struct prefix_cacheinfo ci;
4310
15e47304 4311 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6051e2f4 4312 if (nlh == NULL)
26932566 4313 return -EMSGSIZE;
6051e2f4
TG		 4314
4315 pmsg = nlmsg_data(nlh);
1da177e4 4316 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4317 pmsg->prefix_pad1 = 0;
4318 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4319 pmsg->prefix_ifindex = idev->dev->ifindex;
4320 pmsg->prefix_len = pinfo->prefix_len;
4321 pmsg->prefix_type = pinfo->type;
8a47077a 4322 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4323 pmsg->prefix_flags = 0;
4324 if (pinfo->onlink)
4325 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4326 if (pinfo->autoconf)
4327 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4328
c78679e8
DM		 4329 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4330 goto nla_put_failure;
1da177e4
LT		 4331 ci.preferred_time = ntohl(pinfo->prefered);
4332 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 4333 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4334 goto nla_put_failure;
6051e2f4 4335 return nlmsg_end(skb, nlh);
1da177e4 4336
6051e2f4 4337nla_put_failure:
26932566
PM		 4338 nlmsg_cancel(skb, nlh);
4339 return -EMSGSIZE;
1da177e4
LT		 4340}
4341
1ab1457c 4342static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4343 struct prefix_info *pinfo)
4344{
4345 struct sk_buff *skb;
c346dca1 4346 struct net *net = dev_net(idev->dev);
8c384bfa 4347 int err = -ENOBUFS;
1da177e4 4348
339bf98f 4349 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4350 if (skb == NULL)
4351 goto errout;
4352
4353 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4354 if (err < 0) {
4355 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4356 WARN_ON(err == -EMSGSIZE);
4357 kfree_skb(skb);
4358 goto errout;
4359 }
1ce85fe4
PNA		 4360 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4361 return;
8c384bfa
TG		 4362errout:
4363 if (err < 0)
6fda7350 4364 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4365}
4366
1da177e4
LT		 4367static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4368{
4369 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4370
4371 switch (event) {
4372 case RTM_NEWADDR:
95c385b4
NH		 4373 /*
4374 * If the address was optimistic
4375 * we inserted the route at the start of
4376 * our DAD process, so we don't need
4377 * to do it again
4378 */
4379 if (!(ifp->rt->rt6i_node))
4380 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4381 if (ifp->idev->cnf.forwarding)
4382 addrconf_join_anycast(ifp);
4383 break;
4384 case RTM_DELADDR:
4385 if (ifp->idev->cnf.forwarding)
4386 addrconf_leave_anycast(ifp);
4387 addrconf_leave_solict(ifp->idev, &ifp->addr);
d8d1f30b 4388 dst_hold(&ifp->rt->dst);
93fa159a 4389
73a8bd74 4390 if (ip6_del_rt(ifp->rt))
d8d1f30b 4391 dst_free(&ifp->rt->dst);
1da177e4
LT		 4392 break;
4393 }
4394}
4395
4396static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4397{
8814c4b5 4398 rcu_read_lock_bh();
1da177e4
LT		 4399 if (likely(ifp->idev->dead == 0))
4400 __ipv6_ifa_notify(event, ifp);
8814c4b5 4401 rcu_read_unlock_bh();
1da177e4
LT		 4402}
4403
4404#ifdef CONFIG_SYSCTL
4405
4406static
8d65af78 4407int addrconf_sysctl_forward(ctl_table *ctl, int write,
1da177e4
LT		 4408 void __user *buffer, size_t *lenp, loff_t *ppos)
4409{
4410 int *valp = ctl->data;
4411 int val = *valp;
88af182e 4412 loff_t pos = *ppos;
013d97e9 4413 ctl_table lctl;
1da177e4
LT		 4414 int ret;
4415
013d97e9
FR		 4416 /*
4417 * ctl->data points to idev->cnf.forwarding, we should
4418 * not modify it until we get the rtnl lock.
4419 */
4420 lctl = *ctl;
4421 lctl.data = &val;
4422
4423 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 4424
c8fecf22 4425 if (write)
b325fddb 4426 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4427 if (ret)
4428 *ppos = pos;
1ab1457c 4429 return ret;
1da177e4
LT		 4430}
4431
56d417b1
BH		 4432static void dev_disable_change(struct inet6_dev *idev)
4433{
4434 if (!idev || !idev->dev)
4435 return;
4436
4437 if (idev->cnf.disable_ipv6)
4438 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4439 else
4440 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4441}
4442
4443static void addrconf_disable_change(struct net *net, __s32 newf)
4444{
4445 struct net_device *dev;
4446 struct inet6_dev *idev;
4447
c6d14c84
ED		 4448 rcu_read_lock();
4449 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4450 idev = __in6_dev_get(dev);
4451 if (idev) {
4452 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4453 idev->cnf.disable_ipv6 = newf;
4454 if (changed)
4455 dev_disable_change(idev);
4456 }
56d417b1 4457 }
c6d14c84 4458 rcu_read_unlock();
56d417b1
BH		 4459}
4460
013d97e9 4461static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 4462{
4463 struct net *net;
013d97e9
FR		 4464 int old;
4465
4466 if (!rtnl_trylock())
4467 return restart_syscall();
56d417b1
BH		 4468
4469 net = (struct net *)table->extra2;
013d97e9
FR		 4470 old = *p;
4471 *p = newf;
56d417b1 4472
013d97e9
FR		 4473 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4474 rtnl_unlock();
56d417b1 4475 return 0;
88af182e 4476 }
56d417b1
BH		 4477
4478 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 4479 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4480 addrconf_disable_change(net, newf);
013d97e9 4481 } else if ((!newf) ^ (!old))
56d417b1
BH		 4482 dev_disable_change((struct inet6_dev *)table->extra1);
4483
4484 rtnl_unlock();
4485 return 0;
4486}
4487
4488static
8d65af78 4489int addrconf_sysctl_disable(ctl_table *ctl, int write,
56d417b1
BH		 4490 void __user *buffer, size_t *lenp, loff_t *ppos)
4491{
4492 int *valp = ctl->data;
4493 int val = *valp;
88af182e 4494 loff_t pos = *ppos;
013d97e9 4495 ctl_table lctl;
56d417b1
BH		 4496 int ret;
4497
013d97e9
FR		 4498 /*
4499 * ctl->data points to idev->cnf.disable_ipv6, we should
4500 * not modify it until we get the rtnl lock.
4501 */
4502 lctl = *ctl;
4503 lctl.data = &val;
4504
4505 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 4506
4507 if (write)
4508 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4509 if (ret)
4510 *ppos = pos;
56d417b1
BH		 4511 return ret;
4512}
4513
1da177e4
LT		 4514static struct addrconf_sysctl_table
4515{
4516 struct ctl_table_header *sysctl_header;
f6a07b29 4517 ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 4518} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4519 .sysctl_header = NULL,
4520 .addrconf_vars = {
1ab1457c 4521 {
e21e8467
SH		 4522 .procname = "forwarding",
4523 .data = &ipv6_devconf.forwarding,
4524 .maxlen = sizeof(int),
4525 .mode = 0644,
4526 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4527 },
4528 {
e21e8467
SH		 4529 .procname = "hop_limit",
4530 .data = &ipv6_devconf.hop_limit,
4531 .maxlen = sizeof(int),
4532 .mode = 0644,
4533 .proc_handler = proc_dointvec,
1da177e4
LT		 4534 },
4535 {
e21e8467
SH		 4536 .procname = "mtu",
4537 .data = &ipv6_devconf.mtu6,
4538 .maxlen = sizeof(int),
4539 .mode = 0644,
4540 .proc_handler = proc_dointvec,
1da177e4
LT		 4541 },
4542 {
e21e8467
SH		 4543 .procname = "accept_ra",
4544 .data = &ipv6_devconf.accept_ra,
4545 .maxlen = sizeof(int),
4546 .mode = 0644,
4547 .proc_handler = proc_dointvec,
1da177e4
LT		 4548 },
4549 {
e21e8467
SH		 4550 .procname = "accept_redirects",
4551 .data = &ipv6_devconf.accept_redirects,
4552 .maxlen = sizeof(int),
4553 .mode = 0644,
4554 .proc_handler = proc_dointvec,
1da177e4
LT		 4555 },
4556 {
e21e8467
SH		 4557 .procname = "autoconf",
4558 .data = &ipv6_devconf.autoconf,
4559 .maxlen = sizeof(int),
4560 .mode = 0644,
4561 .proc_handler = proc_dointvec,
1da177e4
LT		 4562 },
4563 {
e21e8467
SH		 4564 .procname = "dad_transmits",
4565 .data = &ipv6_devconf.dad_transmits,
4566 .maxlen = sizeof(int),
4567 .mode = 0644,
4568 .proc_handler = proc_dointvec,
1da177e4
LT		 4569 },
4570 {
e21e8467
SH		 4571 .procname = "router_solicitations",
4572 .data = &ipv6_devconf.rtr_solicits,
4573 .maxlen = sizeof(int),
4574 .mode = 0644,
4575 .proc_handler = proc_dointvec,
1da177e4
LT		 4576 },
4577 {
e21e8467
SH		 4578 .procname = "router_solicitation_interval",
4579 .data = &ipv6_devconf.rtr_solicit_interval,
4580 .maxlen = sizeof(int),
4581 .mode = 0644,
4582 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4583 },
4584 {
e21e8467
SH		 4585 .procname = "router_solicitation_delay",
4586 .data = &ipv6_devconf.rtr_solicit_delay,
4587 .maxlen = sizeof(int),
4588 .mode = 0644,
4589 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4590 },
4591 {
e21e8467
SH		 4592 .procname = "force_mld_version",
4593 .data = &ipv6_devconf.force_mld_version,
4594 .maxlen = sizeof(int),
4595 .mode = 0644,
4596 .proc_handler = proc_dointvec,
1da177e4
LT		 4597 },
4598#ifdef CONFIG_IPV6_PRIVACY
4599 {
e21e8467
SH		 4600 .procname = "use_tempaddr",
4601 .data = &ipv6_devconf.use_tempaddr,
4602 .maxlen = sizeof(int),
4603 .mode = 0644,
4604 .proc_handler = proc_dointvec,
1da177e4
LT		 4605 },
4606 {
e21e8467
SH		 4607 .procname = "temp_valid_lft",
4608 .data = &ipv6_devconf.temp_valid_lft,
4609 .maxlen = sizeof(int),
4610 .mode = 0644,
4611 .proc_handler = proc_dointvec,
1da177e4
LT		 4612 },
4613 {
e21e8467
SH		 4614 .procname = "temp_prefered_lft",
4615 .data = &ipv6_devconf.temp_prefered_lft,
4616 .maxlen = sizeof(int),
4617 .mode = 0644,
4618 .proc_handler = proc_dointvec,
1da177e4
LT		 4619 },
4620 {
e21e8467
SH		 4621 .procname = "regen_max_retry",
4622 .data = &ipv6_devconf.regen_max_retry,
4623 .maxlen = sizeof(int),
4624 .mode = 0644,
4625 .proc_handler = proc_dointvec,
1da177e4
LT		 4626 },
4627 {
e21e8467
SH		 4628 .procname = "max_desync_factor",
4629 .data = &ipv6_devconf.max_desync_factor,
4630 .maxlen = sizeof(int),
4631 .mode = 0644,
4632 .proc_handler = proc_dointvec,
1da177e4
LT		 4633 },
4634#endif
4635 {
e21e8467
SH		 4636 .procname = "max_addresses",
4637 .data = &ipv6_devconf.max_addresses,
4638 .maxlen = sizeof(int),
4639 .mode = 0644,
4640 .proc_handler = proc_dointvec,
1da177e4 4641 },
65f5c7c1 4642 {
e21e8467
SH		 4643 .procname = "accept_ra_defrtr",
4644 .data = &ipv6_devconf.accept_ra_defrtr,
4645 .maxlen = sizeof(int),
4646 .mode = 0644,
4647 .proc_handler = proc_dointvec,
65f5c7c1 4648 },
c4fd30eb 4649 {
e21e8467
SH		 4650 .procname = "accept_ra_pinfo",
4651 .data = &ipv6_devconf.accept_ra_pinfo,
4652 .maxlen = sizeof(int),
4653 .mode = 0644,
4654 .proc_handler = proc_dointvec,
c4fd30eb 4655 },
930d6ff2
YH		 4656#ifdef CONFIG_IPV6_ROUTER_PREF
4657 {
e21e8467
SH		 4658 .procname = "accept_ra_rtr_pref",
4659 .data = &ipv6_devconf.accept_ra_rtr_pref,
4660 .maxlen = sizeof(int),
4661 .mode = 0644,
4662 .proc_handler = proc_dointvec,
930d6ff2 4663 },
52e16356 4664 {
e21e8467
SH		 4665 .procname = "router_probe_interval",
4666 .data = &ipv6_devconf.rtr_probe_interval,
4667 .maxlen = sizeof(int),
4668 .mode = 0644,
4669 .proc_handler = proc_dointvec_jiffies,
52e16356 4670 },
fa03ef38 4671#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4672 {
e21e8467
SH		 4673 .procname = "accept_ra_rt_info_max_plen",
4674 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4675 .maxlen = sizeof(int),
4676 .mode = 0644,
4677 .proc_handler = proc_dointvec,
09c884d4
YH		 4678 },
4679#endif
930d6ff2 4680#endif
fbea49e1 4681 {
e21e8467
SH		 4682 .procname = "proxy_ndp",
4683 .data = &ipv6_devconf.proxy_ndp,
4684 .maxlen = sizeof(int),
4685 .mode = 0644,
4686 .proc_handler = proc_dointvec,
fbea49e1 4687 },
0bcbc926 4688 {
e21e8467
SH		 4689 .procname = "accept_source_route",
4690 .data = &ipv6_devconf.accept_source_route,
4691 .maxlen = sizeof(int),
4692 .mode = 0644,
4693 .proc_handler = proc_dointvec,
0bcbc926 4694 },
95c385b4
NH		 4695#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4696 {
e21e8467
SH		 4697 .procname = "optimistic_dad",
4698 .data = &ipv6_devconf.optimistic_dad,
4699 .maxlen = sizeof(int),
4700 .mode = 0644,
4701 .proc_handler = proc_dointvec,
95c385b4
NH		 4702
4703 },
7bc570c8
YH		 4704#endif
4705#ifdef CONFIG_IPV6_MROUTE
4706 {
e21e8467
SH		 4707 .procname = "mc_forwarding",
4708 .data = &ipv6_devconf.mc_forwarding,
4709 .maxlen = sizeof(int),
4710 .mode = 0444,
4711 .proc_handler = proc_dointvec,
7bc570c8 4712 },
95c385b4 4713#endif
778d80be 4714 {
e21e8467
SH		 4715 .procname = "disable_ipv6",
4716 .data = &ipv6_devconf.disable_ipv6,
4717 .maxlen = sizeof(int),
4718 .mode = 0644,
4719 .proc_handler = addrconf_sysctl_disable,
778d80be 4720 },
1b34be74 4721 {
e21e8467
SH		 4722 .procname = "accept_dad",
4723 .data = &ipv6_devconf.accept_dad,
4724 .maxlen = sizeof(int),
4725 .mode = 0644,
4726 .proc_handler = proc_dointvec,
1b34be74 4727 },
f7734fdf 4728 {
f7734fdf
OP		 4729 .procname = "force_tllao",
4730 .data = &ipv6_devconf.force_tllao,
4731 .maxlen = sizeof(int),
4732 .mode = 0644,
4733 .proc_handler = proc_dointvec
4734 },
5cb04436
HFS		 4735 {
4736 .procname = "ndisc_notify",
4737 .data = &ipv6_devconf.ndisc_notify,
4738 .maxlen = sizeof(int),
4739 .mode = 0644,
4740 .proc_handler = proc_dointvec
4741 },
1da177e4 4742 {
f8572d8f 4743 /* sentinel */
1da177e4
LT		 4744 }
4745 },
1da177e4
LT		 4746};
4747
bff16c2f 4748static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4749 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4750{
4751 int i;
1da177e4 4752 struct addrconf_sysctl_table *t;
6105e293 4753 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 4754
af879cc7 4755 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4756 if (t == NULL)
f68635e6
PE		 4757 goto out;
4758
bcdd553f 4759 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 4760 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 4761 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4762 t->addrconf_vars[i].extra2 = net;
1da177e4 4763 }
1da177e4 4764
6105e293 4765 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 4766
6105e293 4767 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
1da177e4 4768 if (t->sysctl_header == NULL)
6105e293 4769 goto free;
f68635e6
PE		 4770
4771 p->sysctl = t;
95897312 4772 return 0;
1da177e4 4773
f68635e6 4774free:
1da177e4 4775 kfree(t);
f68635e6 4776out:
95897312 4777 return -ENOBUFS;
1da177e4
LT		 4778}
4779
408c4768
PE		 4780static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4781{
4782 struct addrconf_sysctl_table *t;
4783
4784 if (p->sysctl == NULL)
4785 return;
4786
4787 t = p->sysctl;
4788 p->sysctl = NULL;
ff538818 4789 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 4790 kfree(t);
4791}
4792
f52295a9
PE		 4793static void addrconf_sysctl_register(struct inet6_dev *idev)
4794{
54716e3b 4795 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 4796 &ndisc_ifinfo_sysctl_change);
c346dca1 4797 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 4798 idev, &idev->cnf);
f52295a9
PE		 4799}
4800
408c4768 4801static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4802{
408c4768
PE		 4803 __addrconf_sysctl_unregister(&idev->cnf);
4804 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4805}
4806
4807
4808#endif
4809
2c8c1e72 4810static int __net_init addrconf_init_net(struct net *net)
e0da5a48 4811{
a79ca223 4812 int err = -ENOMEM;
e0da5a48
PE		 4813 struct ipv6_devconf *all, *dflt;
4814
a79ca223
HZ		 4815 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
4816 if (all == NULL)
4817 goto err_alloc_all;
e0da5a48 4818
a79ca223
HZ		 4819 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4820 if (dflt == NULL)
4821 goto err_alloc_dflt;
e0da5a48 4822
a79ca223
HZ		 4823 /* these will be inherited by all namespaces */
4824 dflt->autoconf = ipv6_defaults.autoconf;
4825 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 4826
4827 net->ipv6.devconf_all = all;
4828 net->ipv6.devconf_dflt = dflt;
4829
4830#ifdef CONFIG_SYSCTL
f8572d8f 4831 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 4832 if (err < 0)
4833 goto err_reg_all;
4834
f8572d8f 4835 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 4836 if (err < 0)
4837 goto err_reg_dflt;
4838#endif
4839 return 0;
4840
4841#ifdef CONFIG_SYSCTL
4842err_reg_dflt:
4843 __addrconf_sysctl_unregister(all);
4844err_reg_all:
4845 kfree(dflt);
4846#endif
4847err_alloc_dflt:
4848 kfree(all);
4849err_alloc_all:
4850 return err;
4851}
4852
2c8c1e72 4853static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 4854{
4855#ifdef CONFIG_SYSCTL
4856 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4857 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4858#endif
09ad9bc7 4859 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4860 kfree(net->ipv6.devconf_dflt);
4861 kfree(net->ipv6.devconf_all);
4862 }
4863}
4864
4865static struct pernet_operations addrconf_ops = {
4866 .init = addrconf_init_net,
4867 .exit = addrconf_exit_net,
4868};
4869
b382b191
TG		 4870static struct rtnl_af_ops inet6_ops = {
4871 .family = AF_INET6,
4872 .fill_link_af = inet6_fill_link_af,
4873 .get_link_af_size = inet6_get_link_af_size,
b382b191
TG		 4874};
4875
1da177e4
LT		 4876/*
4877 * Init / cleanup code
4878 */
4879
4880int __init addrconf_init(void)
4881{
c2e21293 4882 int i, err;
2a8cc6c8 4883
e21e8467
SH		 4884 err = ipv6_addr_label_init();
4885 if (err < 0) {
f3213831
JP		 4886 pr_crit("%s: cannot initialize default policy table: %d\n",
4887 __func__, err);
2cc6d2bf 4888 goto out;
2a8cc6c8 4889 }
1da177e4 4890
2cc6d2bf
NH		 4891 err = register_pernet_subsys(&addrconf_ops);
4892 if (err < 0)
4893 goto out_addrlabel;
e0da5a48 4894
1da177e4
LT		 4895 /* The addrconf netdev notifier requires that loopback_dev
4896 * has it's ipv6 private information allocated and setup
4897 * before it can bring up and give link-local addresses
4898 * to other devices which are up.
4899 *
4900 * Unfortunately, loopback_dev is not necessarily the first
4901 * entry in the global dev_base list of net devices. In fact,
4902 * it is likely to be the very last entry on that list.
4903 * So this causes the notifier registry below to try and
4904 * give link-local addresses to all devices besides loopback_dev
4905 * first, then loopback_dev, which cases all the non-loopback_dev
4906 * devices to fail to get a link-local address.
4907 *
4908 * So, as a temporary fix, allocate the ipv6 structure for
4909 * loopback_dev first by hand.
4910 * Longer term, all of the dependencies ipv6 has upon the loopback
4911 * device and it being up should be removed.
4912 */
4913 rtnl_lock();
2774c7ab 4914 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4915 err = -ENOMEM;
4916 rtnl_unlock();
4917 if (err)
e0da5a48 4918 goto errlo;
1da177e4 4919
c2e21293 4920 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4921 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4922
1da177e4
LT		 4923 register_netdevice_notifier(&ipv6_dev_notf);
4924
1da177e4 4925 addrconf_verify(0);
c127ea2c 4926
b382b191
TG		 4927 err = rtnl_af_register(&inet6_ops);
4928 if (err < 0)
4929 goto errout_af;
4930
c7ac8679
GR		 4931 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4932 NULL);
c127ea2c
TG		 4933 if (err < 0)
4934 goto errout;
4935
4936 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 4937 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4938 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4939 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4940 inet6_dump_ifaddr, NULL);
4941 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4942 inet6_dump_ifmcaddr, NULL);
4943 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4944 inet6_dump_ifacaddr, NULL);
76f8f6cb
ND		 4945 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
4946 NULL, NULL);
c127ea2c 4947
2a8cc6c8
YH		 4948 ipv6_addr_label_rtnl_register();
4949
1da177e4 4950 return 0;
c127ea2c 4951errout:
b382b191
TG		 4952 rtnl_af_unregister(&inet6_ops);
4953errout_af:
c127ea2c 4954 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4955errlo:
4956 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 4957out_addrlabel:
4958 ipv6_addr_label_cleanup();
4959out:
c127ea2c 4960 return err;
1da177e4
LT		 4961}
4962
09f7709f 4963void addrconf_cleanup(void)
1da177e4 4964{
176c39af 4965 struct net_device *dev;
1da177e4
LT		 4966 int i;
4967
4968 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 4969 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 4970 ipv6_addr_label_cleanup();
1da177e4
LT		 4971
4972 rtnl_lock();
4973
b382b191
TG		 4974 __rtnl_af_unregister(&inet6_ops);
4975
176c39af
DL		 4976 /* clean dev list */
4977 for_each_netdev(&init_net, dev) {
4978 if (__in6_dev_get(dev) == NULL)
4979 continue;
4980 addrconf_ifdown(dev, 1);
4981 }
4982 addrconf_ifdown(init_net.loopback_dev, 2);
4983
1da177e4
LT		 4984 /*
4985 * Check hash table.
4986 */
5c578aed 4987 spin_lock_bh(&addrconf_hash_lock);
c2e21293 4988 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4989 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 4990 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 4991
4992 del_timer(&addr_chk_timer);
1da177e4 4993 rtnl_unlock();
1da177e4 4994}
Linux kernel - Deliverables
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