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Merge tag 'ktest-v3.9' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux...
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
1da177e4
LT		 46#include <linux/socket.h>
47#include <linux/sockios.h>
1da177e4
LT		 48#include <linux/net.h>
49#include <linux/in6.h>
50#include <linux/netdevice.h>
1823730f 51#include <linux/if_addr.h>
1da177e4
LT		 52#include <linux/if_arp.h>
53#include <linux/if_arcnet.h>
54#include <linux/if_infiniband.h>
55#include <linux/route.h>
56#include <linux/inetdevice.h>
57#include <linux/init.h>
5a0e3ad6 58#include <linux/slab.h>
1da177e4
LT		 59#ifdef CONFIG_SYSCTL
60#include <linux/sysctl.h>
61#endif
4fc268d2 62#include <linux/capability.h>
1da177e4
LT		 63#include <linux/delay.h>
64#include <linux/notifier.h>
543537bd 65#include <linux/string.h>
ddbe5032 66#include <linux/hash.h>
1da177e4 67
457c4cbc 68#include <net/net_namespace.h>
1da177e4
LT		 69#include <net/sock.h>
70#include <net/snmp.h>
71
06a4c1c5 72#include <net/af_ieee802154.h>
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
e041c683 171static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 172
888c848e 173static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 174 .forwarding = 0,
175 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
176 .mtu6 = IPV6_MIN_MTU,
177 .accept_ra = 1,
178 .accept_redirects = 1,
179 .autoconf = 1,
180 .force_mld_version = 0,
181 .dad_transmits = 1,
182 .rtr_solicits = MAX_RTR_SOLICITATIONS,
183 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
184 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
185#ifdef CONFIG_IPV6_PRIVACY
186 .use_tempaddr = 0,
187 .temp_valid_lft = TEMP_VALID_LIFETIME,
188 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
189 .regen_max_retry = REGEN_MAX_RETRY,
190 .max_desync_factor = MAX_DESYNC_FACTOR,
191#endif
192 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 193 .accept_ra_defrtr = 1,
c4fd30eb 194 .accept_ra_pinfo = 1,
930d6ff2
YH		 195#ifdef CONFIG_IPV6_ROUTER_PREF
196 .accept_ra_rtr_pref = 1,
52e16356 197 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 198#ifdef CONFIG_IPV6_ROUTE_INFO
199 .accept_ra_rt_info_max_plen = 0,
200#endif
930d6ff2 201#endif
fbea49e1 202 .proxy_ndp = 0,
0bcbc926 203 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 204 .disable_ipv6 = 0,
1b34be74 205 .accept_dad = 1,
1da177e4
LT		 206};
207
ab32ea5d 208static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 209 .forwarding = 0,
210 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
211 .mtu6 = IPV6_MIN_MTU,
212 .accept_ra = 1,
213 .accept_redirects = 1,
214 .autoconf = 1,
215 .dad_transmits = 1,
216 .rtr_solicits = MAX_RTR_SOLICITATIONS,
217 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
218 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
219#ifdef CONFIG_IPV6_PRIVACY
220 .use_tempaddr = 0,
221 .temp_valid_lft = TEMP_VALID_LIFETIME,
222 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
223 .regen_max_retry = REGEN_MAX_RETRY,
224 .max_desync_factor = MAX_DESYNC_FACTOR,
225#endif
226 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 227 .accept_ra_defrtr = 1,
c4fd30eb 228 .accept_ra_pinfo = 1,
930d6ff2
YH		 229#ifdef CONFIG_IPV6_ROUTER_PREF
230 .accept_ra_rtr_pref = 1,
52e16356 231 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 232#ifdef CONFIG_IPV6_ROUTE_INFO
233 .accept_ra_rt_info_max_plen = 0,
234#endif
930d6ff2 235#endif
fbea49e1 236 .proxy_ndp = 0,
0bcbc926 237 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 238 .disable_ipv6 = 0,
1b34be74 239 .accept_dad = 1,
1da177e4
LT		 240};
241
242/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 243const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4 244const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
f3ee4010
YH		 245const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
246const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
2c5e8933
HFS		 247const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
248const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
249const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
1da177e4 250
f24e3d65 251/* Check if a valid qdisc is available */
05297949 252static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 253{
05297949 254 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 255}
256
1da177e4
LT		 257static void addrconf_del_timer(struct inet6_ifaddr *ifp)
258{
259 if (del_timer(&ifp->timer))
260 __in6_ifa_put(ifp);
261}
262
e21e8467 263enum addrconf_timer_t {
1da177e4
LT		 264 AC_NONE,
265 AC_DAD,
266 AC_RS,
267};
268
269static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
270 enum addrconf_timer_t what,
271 unsigned long when)
272{
273 if (!del_timer(&ifp->timer))
274 in6_ifa_hold(ifp);
275
276 switch (what) {
277 case AC_DAD:
278 ifp->timer.function = addrconf_dad_timer;
279 break;
280 case AC_RS:
281 ifp->timer.function = addrconf_rs_timer;
282 break;
e21e8467
SH		 283 default:
284 break;
1da177e4
LT		 285 }
286 ifp->timer.expires = jiffies + when;
287 add_timer(&ifp->timer);
288}
289
7f7d9a6b
HX		 290static int snmp6_alloc_dev(struct inet6_dev *idev)
291{
7d720c3e 292 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
1823e4c8
ED		 293 sizeof(struct ipstats_mib),
294 __alignof__(struct ipstats_mib)) < 0)
7f7d9a6b 295 goto err_ip;
be281e55
ED		 296 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
297 GFP_KERNEL);
298 if (!idev->stats.icmpv6dev)
7f7d9a6b 299 goto err_icmp;
be281e55
ED		 300 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
301 GFP_KERNEL);
302 if (!idev->stats.icmpv6msgdev)
14878f75 303 goto err_icmpmsg;
7f7d9a6b
HX		 304
305 return 0;
306
14878f75 307err_icmpmsg:
be281e55 308 kfree(idev->stats.icmpv6dev);
7f7d9a6b 309err_icmp:
7d720c3e 310 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b 311err_ip:
aaf70ec7 312 return -ENOMEM;
7f7d9a6b
HX		 313}
314
16910b98 315static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 316{
be281e55
ED		 317 kfree(idev->stats.icmpv6msgdev);
318 kfree(idev->stats.icmpv6dev);
7d720c3e 319 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b
HX		 320}
321
1da177e4
LT		 322/* Nobody refers to this device, we may destroy it. */
323
324void in6_dev_finish_destroy(struct inet6_dev *idev)
325{
326 struct net_device *dev = idev->dev;
547b792c 327
502a2ffd 328 WARN_ON(!list_empty(&idev->addr_list));
547b792c
IJ		 329 WARN_ON(idev->mc_list != NULL);
330
1da177e4 331#ifdef NET_REFCNT_DEBUG
91df42be 332 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
1da177e4
LT		 333#endif
334 dev_put(dev);
335 if (!idev->dead) {
f3213831 336 pr_warn("Freeing alive inet6 device %p\n", idev);
1da177e4
LT		 337 return;
338 }
339 snmp6_free_dev(idev);
38f57d1a 340 kfree_rcu(idev, rcu);
1da177e4 341}
7159039a
YH		 342EXPORT_SYMBOL(in6_dev_finish_destroy);
343
8e5e8f30 344static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 345{
346 struct inet6_dev *ndev;
347
348 ASSERT_RTNL();
349
350 if (dev->mtu < IPV6_MIN_MTU)
351 return NULL;
352
1ab1457c 353 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 354
1ab1457c
YH		 355 if (ndev == NULL)
356 return NULL;
322f74a4
IO		 357
358 rwlock_init(&ndev->lock);
359 ndev->dev = dev;
502a2ffd 360 INIT_LIST_HEAD(&ndev->addr_list);
361
c346dca1 362 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 363 ndev->cnf.mtu6 = dev->mtu;
364 ndev->cnf.sysctl = NULL;
365 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
366 if (ndev->nd_parms == NULL) {
367 kfree(ndev);
368 return NULL;
369 }
0187bdfb
BH		 370 if (ndev->cnf.forwarding)
371 dev_disable_lro(dev);
322f74a4
IO		 372 /* We refer to the device */
373 dev_hold(dev);
1da177e4 374
322f74a4
IO		 375 if (snmp6_alloc_dev(ndev) < 0) {
376 ADBG((KERN_WARNING
f3213831 377 "%s: cannot allocate memory for statistics; dev=%s.\n",
0dc47877 378 __func__, dev->name));
322f74a4 379 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 380 dev_put(dev);
381 kfree(ndev);
322f74a4
IO		 382 return NULL;
383 }
1da177e4 384
322f74a4
IO		 385 if (snmp6_register_dev(ndev) < 0) {
386 ADBG((KERN_WARNING
f3213831 387 "%s: cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 388 __func__, dev->name));
322f74a4
IO		 389 neigh_parms_release(&nd_tbl, ndev->nd_parms);
390 ndev->dead = 1;
391 in6_dev_finish_destroy(ndev);
392 return NULL;
393 }
394
395 /* One reference from device. We must do this before
396 * we invoke __ipv6_regen_rndid().
397 */
398 in6_dev_hold(ndev);
1da177e4 399
1b34be74
YH		 400 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
401 ndev->cnf.accept_dad = -1;
402
07a93626 403#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 404 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 405 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 406 ndev->cnf.rtr_solicits = 0;
407 }
408#endif
409
1da177e4 410#ifdef CONFIG_IPV6_PRIVACY
372e6c8f 411 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 412 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 413 if ((dev->flags&IFF_LOOPBACK) ||
414 dev->type == ARPHRD_TUNNEL ||
9625ed72 415 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 416 dev->type == ARPHRD_SIT ||
0be669bb 417 dev->type == ARPHRD_NONE) {
322f74a4
IO		 418 ndev->cnf.use_tempaddr = -1;
419 } else {
420 in6_dev_hold(ndev);
421 ipv6_regen_rndid((unsigned long) ndev);
422 }
1da177e4
LT		 423#endif
424
f24e3d65 425 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 426 ndev->if_flags |= IF_READY;
427
322f74a4
IO		 428 ipv6_mc_init_dev(ndev);
429 ndev->tstamp = jiffies;
f52295a9 430 addrconf_sysctl_register(ndev);
30c4cf57 431 /* protected by rtnl_lock */
cf778b00 432 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 433
2c5e8933
HFS		 434 /* Join interface-local all-node multicast group */
435 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
436
d88ae4cc 437 /* Join all-node multicast group */
f3ee4010 438 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 439
d6ddef9e 440 /* Join all-router multicast group if forwarding is set */
8b2aaede 441 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 442 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
443
1da177e4
LT		 444 return ndev;
445}
446
8e5e8f30 447static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 448{
449 struct inet6_dev *idev;
450
451 ASSERT_RTNL();
452
e21e8467
SH		 453 idev = __in6_dev_get(dev);
454 if (!idev) {
455 idev = ipv6_add_dev(dev);
456 if (!idev)
1da177e4
LT		 457 return NULL;
458 }
c5e33bdd 459
1da177e4
LT		 460 if (dev->flags&IFF_UP)
461 ipv6_mc_up(idev);
462 return idev;
463}
464
f3a1bfb1
ND		 465static int inet6_netconf_msgsize_devconf(int type)
466{
467 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
468 + nla_total_size(4); /* NETCONFA_IFINDEX */
469
76f8f6cb
ND		 470 /* type -1 is used for ALL */
471 if (type == -1 || type == NETCONFA_FORWARDING)
f3a1bfb1 472 size += nla_total_size(4);
b1afce95 473#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 474 if (type == -1 || type == NETCONFA_MC_FORWARDING)
475 size += nla_total_size(4);
b1afce95 476#endif
f3a1bfb1
ND		 477
478 return size;
479}
480
481static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
482 struct ipv6_devconf *devconf, u32 portid,
483 u32 seq, int event, unsigned int flags,
484 int type)
485{
486 struct nlmsghdr *nlh;
487 struct netconfmsg *ncm;
488
489 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
490 flags);
491 if (nlh == NULL)
492 return -EMSGSIZE;
493
494 ncm = nlmsg_data(nlh);
495 ncm->ncm_family = AF_INET6;
496
497 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
498 goto nla_put_failure;
499
76f8f6cb
ND		 500 /* type -1 is used for ALL */
501 if ((type == -1 || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 502 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
503 goto nla_put_failure;
b1afce95 504#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 505 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
506 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
507 devconf->mc_forwarding) < 0)
508 goto nla_put_failure;
b1afce95 509#endif
f3a1bfb1
ND		 510 return nlmsg_end(skb, nlh);
511
512nla_put_failure:
513 nlmsg_cancel(skb, nlh);
514 return -EMSGSIZE;
515}
516
d67b8c61
ND		 517void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
518 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 519{
520 struct sk_buff *skb;
521 int err = -ENOBUFS;
522
523 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
524 if (skb == NULL)
525 goto errout;
526
527 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
528 RTM_NEWNETCONF, 0, type);
529 if (err < 0) {
530 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
531 WARN_ON(err == -EMSGSIZE);
532 kfree_skb(skb);
533 goto errout;
534 }
535 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
536 return;
537errout:
bd779028 538 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 539}
540
76f8f6cb
ND		 541static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
542 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
543 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
544};
545
546static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
547 struct nlmsghdr *nlh,
548 void *arg)
549{
550 struct net *net = sock_net(in_skb->sk);
551 struct nlattr *tb[NETCONFA_MAX+1];
552 struct netconfmsg *ncm;
553 struct sk_buff *skb;
554 struct ipv6_devconf *devconf;
555 struct inet6_dev *in6_dev;
556 struct net_device *dev;
557 int ifindex;
558 int err;
559
560 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
561 devconf_ipv6_policy);
562 if (err < 0)
563 goto errout;
564
565 err = EINVAL;
566 if (!tb[NETCONFA_IFINDEX])
567 goto errout;
568
569 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
570 switch (ifindex) {
571 case NETCONFA_IFINDEX_ALL:
572 devconf = net->ipv6.devconf_all;
573 break;
574 case NETCONFA_IFINDEX_DEFAULT:
575 devconf = net->ipv6.devconf_dflt;
576 break;
577 default:
578 dev = __dev_get_by_index(net, ifindex);
579 if (dev == NULL)
580 goto errout;
581 in6_dev = __in6_dev_get(dev);
582 if (in6_dev == NULL)
583 goto errout;
584 devconf = &in6_dev->cnf;
585 break;
586 }
587
588 err = -ENOBUFS;
589 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
590 if (skb == NULL)
591 goto errout;
592
593 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
594 NETLINK_CB(in_skb).portid,
595 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
596 -1);
597 if (err < 0) {
598 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
599 WARN_ON(err == -EMSGSIZE);
600 kfree_skb(skb);
601 goto errout;
602 }
603 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
604errout:
605 return err;
606}
607
1da177e4
LT		 608#ifdef CONFIG_SYSCTL
609static void dev_forward_change(struct inet6_dev *idev)
610{
611 struct net_device *dev;
612 struct inet6_ifaddr *ifa;
1da177e4
LT		 613
614 if (!idev)
615 return;
616 dev = idev->dev;
0187bdfb
BH		 617 if (idev->cnf.forwarding)
618 dev_disable_lro(dev);
1a940835 619 if (dev->flags & IFF_MULTICAST) {
2c5e8933 620 if (idev->cnf.forwarding) {
f3ee4010 621 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 622 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
623 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
624 } else {
f3ee4010 625 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 626 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
627 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
628 }
1da177e4 629 }
502a2ffd 630
631 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 632 if (ifa->flags&IFA_F_TENTATIVE)
633 continue;
1da177e4
LT		 634 if (idev->cnf.forwarding)
635 addrconf_join_anycast(ifa);
636 else
637 addrconf_leave_anycast(ifa);
638 }
f3a1bfb1
ND		 639 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
640 dev->ifindex, &idev->cnf);
1da177e4
LT		 641}
642
643
e186932b 644static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 645{
646 struct net_device *dev;
647 struct inet6_dev *idev;
648
4acd4945 649 for_each_netdev(net, dev) {
1da177e4
LT		 650 idev = __in6_dev_get(dev);
651 if (idev) {
e186932b
PE		 652 int changed = (!idev->cnf.forwarding) ^ (!newf);
653 idev->cnf.forwarding = newf;
1da177e4
LT		 654 if (changed)
655 dev_forward_change(idev);
656 }
1da177e4 657 }
1da177e4 658}
c8fecf22 659
013d97e9 660static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 661{
bff16c2f 662 struct net *net;
013d97e9
FR		 663 int old;
664
665 if (!rtnl_trylock())
666 return restart_syscall();
bff16c2f
PE		 667
668 net = (struct net *)table->extra2;
013d97e9
FR		 669 old = *p;
670 *p = newf;
b325fddb 671
013d97e9 672 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 673 if ((!newf) ^ (!old))
674 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
675 NETCONFA_IFINDEX_DEFAULT,
676 net->ipv6.devconf_dflt);
013d97e9
FR		 677 rtnl_unlock();
678 return 0;
88af182e 679 }
c8fecf22 680
e186932b 681 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 682 net->ipv6.devconf_dflt->forwarding = newf;
683 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 684 if ((!newf) ^ (!old))
685 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
686 NETCONFA_IFINDEX_ALL,
687 net->ipv6.devconf_all);
013d97e9 688 } else if ((!newf) ^ (!old))
c8fecf22 689 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 690 rtnl_unlock();
c8fecf22 691
013d97e9 692 if (newf)
7b4da532 693 rt6_purge_dflt_routers(net);
b325fddb 694 return 1;
c8fecf22 695}
1da177e4
LT		 696#endif
697
5c578aed 698/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 699void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
700{
c2e21293 701 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 702
1da177e4 703#ifdef NET_REFCNT_DEBUG
91df42be 704 pr_debug("%s\n", __func__);
1da177e4
LT		 705#endif
706
707 in6_dev_put(ifp->idev);
708
709 if (del_timer(&ifp->timer))
e21e8467 710 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
1da177e4 711
e9d3e084 712 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 713 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 714 return;
715 }
94e187c0 716 ip6_rt_put(ifp->rt);
1da177e4 717
e5785985 718 kfree_rcu(ifp, rcu);
1da177e4
LT		 719}
720
e55ffac6
BH		 721static void
722ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
723{
502a2ffd 724 struct list_head *p;
8a6ce0c0 725 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 726
727 /*
728 * Each device address list is sorted in order of scope -
729 * global before linklocal.
730 */
502a2ffd 731 list_for_each(p, &idev->addr_list) {
732 struct inet6_ifaddr *ifa
733 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 734 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 735 break;
736 }
737
b54c9b98 738 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 739}
740
ddbe5032 741static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 742{
ddbe5032 743 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 744}
745
1da177e4
LT		 746/* On success it returns ifp with increased reference count */
747
748static struct inet6_ifaddr *
749ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 750 int scope, u32 flags)
1da177e4
LT		 751{
752 struct inet6_ifaddr *ifa = NULL;
753 struct rt6_info *rt;
3a88a81d 754 unsigned int hash;
1da177e4 755 int err = 0;
d68b8270
YH		 756 int addr_type = ipv6_addr_type(addr);
757
758 if (addr_type == IPV6_ADDR_ANY ||
759 addr_type & IPV6_ADDR_MULTICAST ||
760 (!(idev->dev->flags & IFF_LOOPBACK) &&
761 addr_type & IPV6_ADDR_LOOPBACK))
762 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 763
8814c4b5 764 rcu_read_lock_bh();
1da177e4
LT		 765 if (idev->dead) {
766 err = -ENODEV; /*XXX*/
767 goto out2;
768 }
769
56d417b1 770 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 771 err = -EACCES;
772 goto out2;
773 }
774
5c578aed 775 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 776
777 /* Ignore adding duplicate addresses on an interface */
c346dca1 778 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 779 ADBG(("ipv6_add_addr: already assigned\n"));
780 err = -EEXIST;
781 goto out;
782 }
783
322f74a4 784 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 785
786 if (ifa == NULL) {
787 ADBG(("ipv6_add_addr: malloc failed\n"));
788 err = -ENOBUFS;
789 goto out;
790 }
791
8f031519 792 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 793 if (IS_ERR(rt)) {
794 err = PTR_ERR(rt);
795 goto out;
796 }
797
4e3fd7a0 798 ifa->addr = *addr;
1da177e4
LT		 799
800 spin_lock_init(&ifa->lock);
e9d3e084 801 spin_lock_init(&ifa->state_lock);
1da177e4 802 init_timer(&ifa->timer);
c2e21293 803 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 804 ifa->timer.data = (unsigned long) ifa;
805 ifa->scope = scope;
806 ifa->prefix_len = pfxlen;
807 ifa->flags = flags | IFA_F_TENTATIVE;
808 ifa->cstamp = ifa->tstamp = jiffies;
809
57f5f544
KF		 810 ifa->rt = rt;
811
1da177e4
LT		 812 ifa->idev = idev;
813 in6_dev_hold(idev);
814 /* For caller */
815 in6_ifa_hold(ifa);
816
817 /* Add to big hash table */
ddbe5032 818 hash = inet6_addr_hash(addr);
1da177e4 819
5c578aed 820 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 821 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 822
823 write_lock(&idev->lock);
824 /* Add to inet6_dev unicast addr list. */
e55ffac6 825 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 826
827#ifdef CONFIG_IPV6_PRIVACY
828 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 829 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 830 in6_ifa_hold(ifa);
831 }
832#endif
833
1da177e4
LT		 834 in6_ifa_hold(ifa);
835 write_unlock(&idev->lock);
836out2:
8814c4b5 837 rcu_read_unlock_bh();
1da177e4 838
fd92833a 839 if (likely(err == 0))
e041c683 840 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 841 else {
842 kfree(ifa);
843 ifa = ERR_PTR(err);
844 }
845
846 return ifa;
847out:
5c578aed 848 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 849 goto out2;
850}
851
852/* This function wants to get referenced ifp and releases it before return */
853
854static void ipv6_del_addr(struct inet6_ifaddr *ifp)
855{
502a2ffd 856 struct inet6_ifaddr *ifa, *ifn;
1da177e4 857 struct inet6_dev *idev = ifp->idev;
4c5ff6a6 858 int state;
1da177e4
LT		 859 int deleted = 0, onlink = 0;
860 unsigned long expires = jiffies;
861
4c5ff6a6
HX		 862 spin_lock_bh(&ifp->state_lock);
863 state = ifp->state;
e9d3e084 864 ifp->state = INET6_IFADDR_STATE_DEAD;
4c5ff6a6
HX		 865 spin_unlock_bh(&ifp->state_lock);
866
867 if (state == INET6_IFADDR_STATE_DEAD)
868 goto out;
1da177e4 869
5c578aed 870 spin_lock_bh(&addrconf_hash_lock);
871 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 872 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 873
874 write_lock_bh(&idev->lock);
875#ifdef CONFIG_IPV6_PRIVACY
876 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 877 list_del(&ifp->tmp_list);
878 if (ifp->ifpub) {
879 in6_ifa_put(ifp->ifpub);
880 ifp->ifpub = NULL;
1da177e4 881 }
372e6c8f 882 __in6_ifa_put(ifp);
1da177e4
LT		 883 }
884#endif
885
502a2ffd 886 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
1da177e4 887 if (ifa == ifp) {
502a2ffd 888 list_del_init(&ifp->if_list);
1da177e4 889 __in6_ifa_put(ifp);
502a2ffd 890
1da177e4
LT		 891 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
892 break;
893 deleted = 1;
1d142804 894 continue;
1da177e4
LT		 895 } else if (ifp->flags & IFA_F_PERMANENT) {
896 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
897 ifp->prefix_len)) {
898 if (ifa->flags & IFA_F_PERMANENT) {
899 onlink = 1;
900 if (deleted)
901 break;
902 } else {
903 unsigned long lifetime;
904
905 if (!onlink)
906 onlink = -1;
907
908 spin_lock(&ifa->lock);
4bed72e4
YH		 909
910 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
911 /*
912 * Note: Because this address is
913 * not permanent, lifetime <
914 * LONG_MAX / HZ here.
915 */
1da177e4
LT		 916 if (time_before(expires,
917 ifa->tstamp + lifetime * HZ))
918 expires = ifa->tstamp + lifetime * HZ;
919 spin_unlock(&ifa->lock);
920 }
921 }
922 }
923 }
924 write_unlock_bh(&idev->lock);
925
b2238566
AV		 926 addrconf_del_timer(ifp);
927
1da177e4
LT		 928 ipv6_ifa_notify(RTM_DELADDR, ifp);
929
e041c683 930 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4 931
1da177e4
LT		 932 /*
933 * Purge or update corresponding prefix
934 *
935 * 1) we don't purge prefix here if address was not permanent.
936 * prefix is managed by its own lifetime.
937 * 2) if there're no addresses, delete prefix.
938 * 3) if there're still other permanent address(es),
939 * corresponding prefix is still permanent.
940 * 4) otherwise, update prefix lifetime to the
941 * longest valid lifetime among the corresponding
942 * addresses on the device.
943 * Note: subsequent RA will update lifetime.
944 *
945 * --yoshfuji
946 */
947 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
948 struct in6_addr prefix;
949 struct rt6_info *rt;
64c6d08e 950
1da177e4 951 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
1da177e4 952
21caa662
RK		 953 rt = addrconf_get_prefix_route(&prefix,
954 ifp->prefix_len,
955 ifp->idev->dev,
956 0, RTF_GATEWAY | RTF_DEFAULT);
957
958 if (rt) {
1da177e4 959 if (onlink == 0) {
e0a1ad73 960 ip6_del_rt(rt);
1da177e4
LT		 961 rt = NULL;
962 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1716a961 963 rt6_set_expires(rt, expires);
1da177e4
LT		 964 }
965 }
94e187c0 966 ip6_rt_put(rt);
1da177e4
LT		 967 }
968
c3968a85
DW		 969 /* clean up prefsrc entries */
970 rt6_remove_prefsrc(ifp);
4c5ff6a6 971out:
1da177e4
LT		 972 in6_ifa_put(ifp);
973}
974
975#ifdef CONFIG_IPV6_PRIVACY
976static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
977{
978 struct inet6_dev *idev = ifp->idev;
979 struct in6_addr addr, *tmpaddr;
76f793e3 980 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 981 unsigned long regen_advance;
1da177e4
LT		 982 int tmp_plen;
983 int ret = 0;
984 int max_addresses;
95c385b4 985 u32 addr_flags;
76f793e3 986 unsigned long now = jiffies;
1da177e4
LT		 987
988 write_lock(&idev->lock);
989 if (ift) {
990 spin_lock_bh(&ift->lock);
991 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
992 spin_unlock_bh(&ift->lock);
993 tmpaddr = &addr;
994 } else {
995 tmpaddr = NULL;
996 }
997retry:
998 in6_dev_hold(idev);
999 if (idev->cnf.use_tempaddr <= 0) {
1000 write_unlock(&idev->lock);
f3213831 1001 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1002 in6_dev_put(idev);
1003 ret = -1;
1004 goto out;
1005 }
1006 spin_lock_bh(&ifp->lock);
1007 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1008 idev->cnf.use_tempaddr = -1; /*XXX*/
1009 spin_unlock_bh(&ifp->lock);
1010 write_unlock(&idev->lock);
f3213831
JP		 1011 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1012 __func__);
1da177e4
LT		 1013 in6_dev_put(idev);
1014 ret = -1;
1015 goto out;
1016 }
1017 in6_ifa_hold(ifp);
1018 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 1019 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1020 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1021 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 1022 tmp_valid_lft = min_t(__u32,
1023 ifp->valid_lft,
7a876b0e 1024 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 1025 tmp_prefered_lft = min_t(__u32,
1026 ifp->prefered_lft,
7a876b0e 1027 idev->cnf.temp_prefered_lft + age -
784e2710 1028 idev->cnf.max_desync_factor);
1da177e4
LT		 1029 tmp_plen = ifp->prefix_len;
1030 max_addresses = idev->cnf.max_addresses;
1da177e4
LT		 1031 tmp_tstamp = ifp->tstamp;
1032 spin_unlock_bh(&ifp->lock);
1033
eac55bf9
BB		 1034 regen_advance = idev->cnf.regen_max_retry *
1035 idev->cnf.dad_transmits *
1036 idev->nd_parms->retrans_time / HZ;
1da177e4 1037 write_unlock(&idev->lock);
95c385b4 1038
eac55bf9
BB		 1039 /* A temporary address is created only if this calculated Preferred
1040 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1041 * an implementation must not create a temporary address with a zero
1042 * Preferred Lifetime.
1043 */
1044 if (tmp_prefered_lft <= regen_advance) {
1045 in6_ifa_put(ifp);
1046 in6_dev_put(idev);
1047 ret = -1;
1048 goto out;
1049 }
1050
95c385b4
NH		 1051 addr_flags = IFA_F_TEMPORARY;
1052 /* set in addrconf_prefix_rcv() */
1053 if (ifp->flags & IFA_F_OPTIMISTIC)
1054 addr_flags |= IFA_F_OPTIMISTIC;
1055
1da177e4 1056 ift = !max_addresses ||
1ab1457c 1057 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 1058 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 1059 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
1060 addr_flags) : NULL;
3f0d2ba0 1061 if (IS_ERR_OR_NULL(ift)) {
1da177e4
LT		 1062 in6_ifa_put(ifp);
1063 in6_dev_put(idev);
f3213831 1064 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4
LT		 1065 tmpaddr = &addr;
1066 write_lock(&idev->lock);
1067 goto retry;
1068 }
1069
1070 spin_lock_bh(&ift->lock);
1071 ift->ifpub = ifp;
1072 ift->valid_lft = tmp_valid_lft;
1073 ift->prefered_lft = tmp_prefered_lft;
76f793e3 1074 ift->cstamp = now;
1da177e4
LT		 1075 ift->tstamp = tmp_tstamp;
1076 spin_unlock_bh(&ift->lock);
1077
cf22f9a2 1078 addrconf_dad_start(ift);
1da177e4
LT		 1079 in6_ifa_put(ift);
1080 in6_dev_put(idev);
1081out:
1082 return ret;
1083}
1084#endif
1085
1086/*
072047e4 1087 * Choose an appropriate source address (RFC3484)
1da177e4 1088 */
a9b05723
YH		 1089enum {
1090 IPV6_SADDR_RULE_INIT = 0,
1091 IPV6_SADDR_RULE_LOCAL,
1092 IPV6_SADDR_RULE_SCOPE,
1093 IPV6_SADDR_RULE_PREFERRED,
1094#ifdef CONFIG_IPV6_MIP6
1095 IPV6_SADDR_RULE_HOA,
1096#endif
1097 IPV6_SADDR_RULE_OIF,
1098 IPV6_SADDR_RULE_LABEL,
1099#ifdef CONFIG_IPV6_PRIVACY
1100 IPV6_SADDR_RULE_PRIVACY,
1101#endif
1102 IPV6_SADDR_RULE_ORCHID,
1103 IPV6_SADDR_RULE_PREFIX,
1104 IPV6_SADDR_RULE_MAX
1105};
1106
072047e4 1107struct ipv6_saddr_score {
a9b05723
YH		 1108 int rule;
1109 int addr_type;
1110 struct inet6_ifaddr *ifa;
1111 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1112 int scopedist;
1113 int matchlen;
072047e4
YH		 1114};
1115
a9b05723 1116struct ipv6_saddr_dst {
9acd9f3a 1117 const struct in6_addr *addr;
a9b05723
YH		 1118 int ifindex;
1119 int scope;
1120 int label;
7cbca67c 1121 unsigned int prefs;
a9b05723 1122};
072047e4 1123
b6f99a21 1124static inline int ipv6_saddr_preferred(int type)
1da177e4 1125{
45bb0060 1126 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1127 return 1;
1128 return 0;
1da177e4
LT		 1129}
1130
3de23255
BT		 1131static int ipv6_get_saddr_eval(struct net *net,
1132 struct ipv6_saddr_score *score,
a9b05723
YH		 1133 struct ipv6_saddr_dst *dst,
1134 int i)
1135{
1136 int ret;
1137
1138 if (i <= score->rule) {
1139 switch (i) {
1140 case IPV6_SADDR_RULE_SCOPE:
1141 ret = score->scopedist;
1142 break;
1143 case IPV6_SADDR_RULE_PREFIX:
1144 ret = score->matchlen;
1145 break;
1146 default:
1147 ret = !!test_bit(i, score->scorebits);
1148 }
1149 goto out;
1150 }
1151
1152 switch (i) {
1153 case IPV6_SADDR_RULE_INIT:
1154 /* Rule 0: remember if hiscore is not ready yet */
1155 ret = !!score->ifa;
1156 break;
1157 case IPV6_SADDR_RULE_LOCAL:
1158 /* Rule 1: Prefer same address */
1159 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1160 break;
1161 case IPV6_SADDR_RULE_SCOPE:
1162 /* Rule 2: Prefer appropriate scope
1163 *
1164 * ret
1165 * ^
1166 * -1 | d 15
1167 * ---+--+-+---> scope
1168 * |
1169 * | d is scope of the destination.
1170 * B-d | \
1171 * | \ <- smaller scope is better if
1172 * B-15 | \ if scope is enough for destinaion.
1173 * | ret = B - scope (-1 <= scope >= d <= 15).
1174 * d-C-1 | /
1175 * |/ <- greater is better
1176 * -C / if scope is not enough for destination.
1177 * /| ret = scope - C (-1 <= d < scope <= 15).
1178 *
1179 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1180 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1181 * Assume B = 0 and we get C > 29.
1182 */
1183 ret = __ipv6_addr_src_scope(score->addr_type);
1184 if (ret >= dst->scope)
1185 ret = -ret;
1186 else
1187 ret -= 128; /* 30 is enough */
1188 score->scopedist = ret;
1189 break;
1190 case IPV6_SADDR_RULE_PREFERRED:
1191 /* Rule 3: Avoid deprecated and optimistic addresses */
1192 ret = ipv6_saddr_preferred(score->addr_type) ||
1193 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1194 break;
1195#ifdef CONFIG_IPV6_MIP6
1196 case IPV6_SADDR_RULE_HOA:
7cbca67c 1197 {
a9b05723 1198 /* Rule 4: Prefer home address */
7cbca67c
YH		 1199 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1200 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1201 break;
7cbca67c 1202 }
a9b05723
YH		 1203#endif
1204 case IPV6_SADDR_RULE_OIF:
1205 /* Rule 5: Prefer outgoing interface */
1206 ret = (!dst->ifindex ||
1207 dst->ifindex == score->ifa->idev->dev->ifindex);
1208 break;
1209 case IPV6_SADDR_RULE_LABEL:
1210 /* Rule 6: Prefer matching label */
3de23255
BT		 1211 ret = ipv6_addr_label(net,
1212 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1213 score->ifa->idev->dev->ifindex) == dst->label;
1214 break;
1215#ifdef CONFIG_IPV6_PRIVACY
1216 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1217 {
a9b05723 1218 /* Rule 7: Prefer public address
25985edc 1219 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1220 */
7cbca67c
YH		 1221 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1222 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1223 score->ifa->idev->cnf.use_tempaddr >= 2;
1224 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1225 break;
7cbca67c 1226 }
a9b05723
YH		 1227#endif
1228 case IPV6_SADDR_RULE_ORCHID:
1229 /* Rule 8-: Prefer ORCHID vs ORCHID or
1230 * non-ORCHID vs non-ORCHID
1231 */
1232 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1233 ipv6_addr_orchid(dst->addr));
1234 break;
1235 case IPV6_SADDR_RULE_PREFIX:
1236 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1237 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1238 if (ret > score->ifa->prefix_len)
1239 ret = score->ifa->prefix_len;
1240 score->matchlen = ret;
a9b05723
YH		 1241 break;
1242 default:
1243 ret = 0;
1244 }
1245
1246 if (ret)
1247 __set_bit(i, score->scorebits);
1248 score->rule = i;
1249out:
1250 return ret;
1251}
1252
b3f644fc 1253int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1254 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1255 struct in6_addr *saddr)
1da177e4 1256{
a9b05723
YH		 1257 struct ipv6_saddr_score scores[2],
1258 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1259 struct ipv6_saddr_dst dst;
072047e4 1260 struct net_device *dev;
a9b05723 1261 int dst_type;
1da177e4 1262
a9b05723
YH		 1263 dst_type = __ipv6_addr_type(daddr);
1264 dst.addr = daddr;
1265 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1266 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1267 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1268 dst.prefs = prefs;
a9b05723
YH		 1269
1270 hiscore->rule = -1;
1271 hiscore->ifa = NULL;
1da177e4 1272
8814c4b5 1273 rcu_read_lock();
1da177e4 1274
c6d14c84 1275 for_each_netdev_rcu(net, dev) {
072047e4 1276 struct inet6_dev *idev;
072047e4 1277
a9b05723 1278 /* Candidate Source Address (section 4)
072047e4
YH		 1279 * - multicast and link-local destination address,
1280 * the set of candidate source address MUST only
1281 * include addresses assigned to interfaces
1282 * belonging to the same link as the outgoing
1283 * interface.
1284 * (- For site-local destination addresses, the
1285 * set of candidate source addresses MUST only
1286 * include addresses assigned to interfaces
1287 * belonging to the same site as the outgoing
1288 * interface.)
1289 */
a9b05723
YH		 1290 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1291 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1292 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1293 continue;
1da177e4 1294
1da177e4 1295 idev = __in6_dev_get(dev);
072047e4
YH		 1296 if (!idev)
1297 continue;
1298
1299 read_lock_bh(&idev->lock);
502a2ffd 1300 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1301 int i;
072047e4 1302
a9b05723 1303 /*
6b3ae80a
YH		 1304 * - Tentative Address (RFC2462 section 5.4)
1305 * - A tentative address is not considered
1306 * "assigned to an interface" in the traditional
95c385b4 1307 * sense, unless it is also flagged as optimistic.
6b3ae80a 1308 * - Candidate Source Address (section 4)
072047e4
YH		 1309 * - In any case, anycast addresses, multicast
1310 * addresses, and the unspecified address MUST
1311 * NOT be included in a candidate set.
1312 */
a9b05723
YH		 1313 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1314 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1315 continue;
a9b05723
YH		 1316
1317 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1318
1319 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1320 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1321 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1322 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1323 "assigned as unicast address on %s",
1324 dev->name);
1325 continue;
1326 }
1327
a9b05723
YH		 1328 score->rule = -1;
1329 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1330
1331 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1332 int minihiscore, miniscore;
1333
3de23255
BT		 1334 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1335 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1336
1337 if (minihiscore > miniscore) {
1338 if (i == IPV6_SADDR_RULE_SCOPE &&
1339 score->scopedist > 0) {
1340 /*
1341 * special case:
1342 * each remaining entry
1343 * has too small (not enough)
1344 * scope, because ifa entries
1345 * are sorted by their scope
1346 * values.
1347 */
1348 goto try_nextdev;
1349 }
1350 break;
1351 } else if (minihiscore < miniscore) {
a9b05723
YH		 1352 if (hiscore->ifa)
1353 in6_ifa_put(hiscore->ifa);
1354
1355 in6_ifa_hold(score->ifa);
1356
a0bffffc 1357 swap(hiscore, score);
a9b05723
YH		 1358
1359 /* restore our iterator */
1360 score->ifa = hiscore->ifa;
1361
1362 break;
1da177e4 1363 }
072047e4 1364 }
1da177e4 1365 }
a9b05723 1366try_nextdev:
072047e4 1367 read_unlock_bh(&idev->lock);
1da177e4 1368 }
8814c4b5 1369 rcu_read_unlock();
1da177e4 1370
a9b05723 1371 if (!hiscore->ifa)
072047e4 1372 return -EADDRNOTAVAIL;
1ab1457c 1373
4e3fd7a0 1374 *saddr = hiscore->ifa->addr;
a9b05723 1375 in6_ifa_put(hiscore->ifa);
072047e4 1376 return 0;
1da177e4 1377}
5e5f3f0f 1378EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1379
95c385b4
NH		 1380int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1381 unsigned char banned_flags)
1da177e4
LT		 1382{
1383 struct inet6_dev *idev;
1384 int err = -EADDRNOTAVAIL;
1385
8814c4b5 1386 rcu_read_lock();
e21e8467
SH		 1387 idev = __in6_dev_get(dev);
1388 if (idev) {
1da177e4
LT		 1389 struct inet6_ifaddr *ifp;
1390
1391 read_lock_bh(&idev->lock);
502a2ffd 1392 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1393 if (ifp->scope == IFA_LINK &&
1394 !(ifp->flags & banned_flags)) {
4e3fd7a0 1395 *addr = ifp->addr;
1da177e4
LT		 1396 err = 0;
1397 break;
1398 }
1399 }
1400 read_unlock_bh(&idev->lock);
1401 }
8814c4b5 1402 rcu_read_unlock();
1da177e4
LT		 1403 return err;
1404}
1405
1406static int ipv6_count_addresses(struct inet6_dev *idev)
1407{
1408 int cnt = 0;
1409 struct inet6_ifaddr *ifp;
1410
1411 read_lock_bh(&idev->lock);
502a2ffd 1412 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1413 cnt++;
1414 read_unlock_bh(&idev->lock);
1415 return cnt;
1416}
1417
b71d1d42 1418int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
bfeade08 1419 struct net_device *dev, int strict)
1da177e4 1420{
eedf042a 1421 struct inet6_ifaddr *ifp;
c2e21293 1422 struct hlist_node *node;
ddbe5032 1423 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1424
5c578aed 1425 rcu_read_lock_bh();
1426 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1427 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1428 continue;
1da177e4 1429 if (ipv6_addr_equal(&ifp->addr, addr) &&
eedf042a
SH		 1430 !(ifp->flags&IFA_F_TENTATIVE) &&
1431 (dev == NULL || ifp->idev->dev == dev ||
1432 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1433 rcu_read_unlock_bh();
1434 return 1;
1da177e4
LT		 1435 }
1436 }
5c578aed 1437
eedf042a
SH		 1438 rcu_read_unlock_bh();
1439 return 0;
1da177e4 1440}
7159039a
YH		 1441EXPORT_SYMBOL(ipv6_chk_addr);
1442
3e81c6da
DM		 1443static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1444 struct net_device *dev)
1da177e4 1445{
ddbe5032 1446 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1447 struct inet6_ifaddr *ifp;
1448 struct hlist_node *node;
1da177e4 1449
c2e21293 1450 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1451 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1452 continue;
1da177e4
LT		 1453 if (ipv6_addr_equal(&ifp->addr, addr)) {
1454 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1455 return true;
1da177e4
LT		 1456 }
1457 }
3e81c6da 1458 return false;
1da177e4
LT		 1459}
1460
b71d1d42 1461int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1462{
1463 struct inet6_dev *idev;
1464 struct inet6_ifaddr *ifa;
1465 int onlink;
1466
1467 onlink = 0;
1468 rcu_read_lock();
1469 idev = __in6_dev_get(dev);
1470 if (idev) {
1471 read_lock_bh(&idev->lock);
502a2ffd 1472 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1473 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1474 ifa->prefix_len);
1475 if (onlink)
1476 break;
1477 }
1478 read_unlock_bh(&idev->lock);
1479 }
1480 rcu_read_unlock();
1481 return onlink;
1482}
52eeeb84
YH		 1483EXPORT_SYMBOL(ipv6_chk_prefix);
1484
9acd9f3a 1485struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1486 struct net_device *dev, int strict)
1da177e4 1487{
b79d1d54 1488 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1489 unsigned int hash = inet6_addr_hash(addr);
b79d1d54 1490 struct hlist_node *node;
1da177e4 1491
5c578aed 1492 rcu_read_lock_bh();
4f70ecca 1493 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1494 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1495 continue;
1da177e4
LT		 1496 if (ipv6_addr_equal(&ifp->addr, addr)) {
1497 if (dev == NULL || ifp->idev->dev == dev ||
1498 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1499 result = ifp;
1da177e4
LT		 1500 in6_ifa_hold(ifp);
1501 break;
1502 }
1503 }
1504 }
5c578aed 1505 rcu_read_unlock_bh();
1da177e4 1506
b79d1d54 1507 return result;
1da177e4
LT		 1508}
1509
1da177e4
LT		 1510/* Gets referenced address, destroys ifaddr */
1511
cc411d0b 1512static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1513{
1da177e4
LT		 1514 if (ifp->flags&IFA_F_PERMANENT) {
1515 spin_lock_bh(&ifp->lock);
1516 addrconf_del_timer(ifp);
1517 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1518 if (dad_failed)
1519 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1520 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1521 if (dad_failed)
1522 ipv6_ifa_notify(0, ifp);
1da177e4
LT		 1523 in6_ifa_put(ifp);
1524#ifdef CONFIG_IPV6_PRIVACY
1525 } else if (ifp->flags&IFA_F_TEMPORARY) {
1526 struct inet6_ifaddr *ifpub;
1527 spin_lock_bh(&ifp->lock);
1528 ifpub = ifp->ifpub;
1529 if (ifpub) {
1530 in6_ifa_hold(ifpub);
1531 spin_unlock_bh(&ifp->lock);
1532 ipv6_create_tempaddr(ifpub, ifp);
1533 in6_ifa_put(ifpub);
1534 } else {
1535 spin_unlock_bh(&ifp->lock);
1536 }
1537 ipv6_del_addr(ifp);
1538#endif
1539 } else
1540 ipv6_del_addr(ifp);
1541}
1542
f2344a13
HX		 1543static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1544{
1545 int err = -ENOENT;
1546
1547 spin_lock(&ifp->state_lock);
1548 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1549 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1550 err = 0;
1551 }
1552 spin_unlock(&ifp->state_lock);
1553
1554 return err;
1555}
1556
3c21edbd
YH		 1557void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1558{
1b34be74 1559 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1560
853dc2e0
UB		 1561 if (addrconf_dad_end(ifp)) {
1562 in6_ifa_put(ifp);
f2344a13 1563 return;
853dc2e0 1564 }
f2344a13 1565
e87cc472
JP		 1566 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1567 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1568
1b34be74
YH		 1569 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1570 struct in6_addr addr;
1571
1572 addr.s6_addr32[0] = htonl(0xfe800000);
1573 addr.s6_addr32[1] = 0;
1574
1575 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1576 ipv6_addr_equal(&ifp->addr, &addr)) {
1577 /* DAD failed for link-local based on MAC address */
1578 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1579
f3213831 1580 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1581 ifp->idev->dev->name);
1b34be74
YH		 1582 }
1583 }
1584
cc411d0b 1585 addrconf_dad_stop(ifp, 1);
3c21edbd 1586}
1da177e4
LT		 1587
1588/* Join to solicited addr multicast group. */
1589
b71d1d42 1590void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1591{
1592 struct in6_addr maddr;
1593
1594 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1595 return;
1596
1597 addrconf_addr_solict_mult(addr, &maddr);
1598 ipv6_dev_mc_inc(dev, &maddr);
1599}
1600
b71d1d42 1601void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1602{
1603 struct in6_addr maddr;
1604
1605 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1606 return;
1607
1608 addrconf_addr_solict_mult(addr, &maddr);
1609 __ipv6_dev_mc_dec(idev, &maddr);
1610}
1611
20380731 1612static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1613{
1614 struct in6_addr addr;
2bda8a0c
BM		 1615 if (ifp->prefix_len == 127) /* RFC 6164 */
1616 return;
1da177e4
LT		 1617 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1618 if (ipv6_addr_any(&addr))
1619 return;
1620 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1621}
1622
20380731 1623static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1624{
1625 struct in6_addr addr;
32019e65
YH		 1626 if (ifp->prefix_len == 127) /* RFC 6164 */
1627 return;
1da177e4
LT		 1628 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1629 if (ipv6_addr_any(&addr))
1630 return;
1631 __ipv6_dev_ac_dec(ifp->idev, &addr);
1632}
1633
073a8e0e
YH		 1634static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1635{
1636 if (dev->addr_len != ETH_ALEN)
1637 return -1;
1638 memcpy(eui, dev->dev_addr, 3);
1639 memcpy(eui + 5, dev->dev_addr + 3, 3);
1640
1641 /*
1642 * The zSeries OSA network cards can be shared among various
1643 * OS instances, but the OSA cards have only one MAC address.
1644 * This leads to duplicate address conflicts in conjunction
1645 * with IPv6 if more than one instance uses the same card.
1646 *
1647 * The driver for these cards can deliver a unique 16-bit
1648 * identifier for each instance sharing the same card. It is
1649 * placed instead of 0xFFFE in the interface identifier. The
1650 * "u" bit of the interface identifier is not inverted in this
1651 * case. Hence the resulting interface identifier has local
1652 * scope according to RFC2373.
1653 */
1654 if (dev->dev_id) {
1655 eui[3] = (dev->dev_id >> 8) & 0xFF;
1656 eui[4] = dev->dev_id & 0xFF;
1657 } else {
1658 eui[3] = 0xFF;
1659 eui[4] = 0xFE;
1660 eui[0] ^= 2;
1661 }
1662 return 0;
1663}
1664
06a4c1c5 1665static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1666{
1667 if (dev->addr_len != IEEE802154_ADDR_LEN)
1668 return -1;
1669 memcpy(eui, dev->dev_addr, 8);
5e98a36e 1670 eui[0] ^= 2;
06a4c1c5 1671 return 0;
1672}
1673
073a8e0e
YH		 1674static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1675{
1676 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1677 if (dev->addr_len != ARCNET_ALEN)
1678 return -1;
1679 memset(eui, 0, 7);
8e5e8f30 1680 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1681 return 0;
1682}
1683
1684static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1685{
1686 if (dev->addr_len != INFINIBAND_ALEN)
1687 return -1;
1688 memcpy(eui, dev->dev_addr + 12, 8);
1689 eui[0] |= 2;
1690 return 0;
1691}
1692
c61393ea 1693static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1694{
9af28511
SH		 1695 if (addr == 0)
1696 return -1;
dfd982ba
YH		 1697 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1698 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1699 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1700 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1701 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1702 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1703 eui[1] = 0;
1704 eui[2] = 0x5E;
1705 eui[3] = 0xFE;
1706 memcpy(eui + 4, &addr, 4);
1707 return 0;
1708}
dfd982ba
YH		 1709
1710static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1711{
1712 if (dev->priv_flags & IFF_ISATAP)
1713 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1714 return -1;
1715}
1716
aee80b54 1717static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1718{
1719 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1720}
1721
1da177e4
LT		 1722static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1723{
1724 switch (dev->type) {
1725 case ARPHRD_ETHER:
1726 case ARPHRD_FDDI:
073a8e0e 1727 return addrconf_ifid_eui48(eui, dev);
1da177e4 1728 case ARPHRD_ARCNET:
073a8e0e 1729 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1730 case ARPHRD_INFINIBAND:
073a8e0e 1731 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1732 case ARPHRD_SIT:
dfd982ba 1733 return addrconf_ifid_sit(eui, dev);
aee80b54 1734 case ARPHRD_IPGRE:
1735 return addrconf_ifid_gre(eui, dev);
06a4c1c5 1736 case ARPHRD_IEEE802154:
1737 return addrconf_ifid_eui64(eui, dev);
1da177e4
LT		 1738 }
1739 return -1;
1740}
1741
1742static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1743{
1744 int err = -1;
1745 struct inet6_ifaddr *ifp;
1746
1747 read_lock_bh(&idev->lock);
502a2ffd 1748 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 1749 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1750 memcpy(eui, ifp->addr.s6_addr+8, 8);
1751 err = 0;
1752 break;
1753 }
1754 }
1755 read_unlock_bh(&idev->lock);
1756 return err;
1757}
1758
1759#ifdef CONFIG_IPV6_PRIVACY
1760/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 1761static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 1762{
1da177e4 1763regen:
955189ef 1764 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1765 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1766
1767 /*
1768 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1769 * check if generated address is not inappropriate
1770 *
1771 * - Reserved subnet anycast (RFC 2526)
1772 * 11111101 11....11 1xxxxxxx
c7dc89c0 1773 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1774 * 00-00-5E-FE-xx-xx-xx-xx
1775 * - value 0
1776 * - XXX: already assigned to an address on the device
1777 */
1ab1457c 1778 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1779 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1780 (idev->rndid[7]&0x80))
1781 goto regen;
1782 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1783 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1784 goto regen;
1785 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1786 goto regen;
1787 }
1da177e4
LT		 1788}
1789
1790static void ipv6_regen_rndid(unsigned long data)
1791{
1792 struct inet6_dev *idev = (struct inet6_dev *) data;
1793 unsigned long expires;
1794
8814c4b5 1795 rcu_read_lock_bh();
1da177e4
LT		 1796 write_lock_bh(&idev->lock);
1797
1798 if (idev->dead)
1799 goto out;
1800
eb7e0575 1801 __ipv6_regen_rndid(idev);
1ab1457c 1802
1da177e4 1803 expires = jiffies +
1ab1457c 1804 idev->cnf.temp_prefered_lft * HZ -
784e2710
BH		 1805 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1806 idev->cnf.max_desync_factor * HZ;
1da177e4 1807 if (time_before(expires, jiffies)) {
f3213831
JP		 1808 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1809 __func__, idev->dev->name);
1da177e4
LT		 1810 goto out;
1811 }
1812
1813 if (!mod_timer(&idev->regen_timer, expires))
1814 in6_dev_hold(idev);
1815
1816out:
1817 write_unlock_bh(&idev->lock);
8814c4b5 1818 rcu_read_unlock_bh();
1da177e4
LT		 1819 in6_dev_put(idev);
1820}
1821
eb7e0575 1822static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 1823{
1da177e4 1824 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 1825 __ipv6_regen_rndid(idev);
1da177e4
LT		 1826}
1827#endif
1828
1829/*
1830 * Add prefix route.
1831 */
1832
1833static void
1834addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1835 unsigned long expires, u32 flags)
1da177e4 1836{
86872cb5
TG		 1837 struct fib6_config cfg = {
1838 .fc_table = RT6_TABLE_PREFIX,
1839 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1840 .fc_ifindex = dev->ifindex,
1841 .fc_expires = expires,
1842 .fc_dst_len = plen,
1843 .fc_flags = RTF_UP | flags,
c346dca1 1844 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1845 .fc_protocol = RTPROT_KERNEL,
86872cb5 1846 };
1da177e4 1847
4e3fd7a0 1848 cfg.fc_dst = *pfx;
1da177e4
LT		 1849
1850 /* Prevent useless cloning on PtP SIT.
1851 This thing is done here expecting that the whole
1852 class of non-broadcast devices need not cloning.
1853 */
07a93626 1854#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 1855 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1856 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1857#endif
1da177e4 1858
86872cb5 1859 ip6_route_add(&cfg);
1da177e4
LT		 1860}
1861
14ef37b6
AH		 1862
1863static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1864 int plen,
1865 const struct net_device *dev,
1866 u32 flags, u32 noflags)
1867{
1868 struct fib6_node *fn;
1869 struct rt6_info *rt = NULL;
1870 struct fib6_table *table;
1871
1872 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1873 if (table == NULL)
1874 return NULL;
1875
5744dd9b 1876 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 1877 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1878 if (!fn)
1879 goto out;
1880 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 1881 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 1882 continue;
1883 if ((rt->rt6i_flags & flags) != flags)
1884 continue;
85da53bf 1885 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 1886 continue;
1887 dst_hold(&rt->dst);
1888 break;
1889 }
1890out:
5744dd9b 1891 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 1892 return rt;
1893}
1894
1895
1da177e4
LT		 1896/* Create "default" multicast route to the interface */
1897
1898static void addrconf_add_mroute(struct net_device *dev)
1899{
86872cb5
TG		 1900 struct fib6_config cfg = {
1901 .fc_table = RT6_TABLE_LOCAL,
1902 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1903 .fc_ifindex = dev->ifindex,
1904 .fc_dst_len = 8,
1905 .fc_flags = RTF_UP,
c346dca1 1906 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1907 };
1908
1909 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1910
1911 ip6_route_add(&cfg);
1da177e4
LT		 1912}
1913
07a93626 1914#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 1915static void sit_route_add(struct net_device *dev)
1916{
86872cb5
TG		 1917 struct fib6_config cfg = {
1918 .fc_table = RT6_TABLE_MAIN,
1919 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1920 .fc_ifindex = dev->ifindex,
1921 .fc_dst_len = 96,
1922 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1923 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1924 };
1da177e4
LT		 1925
1926 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1927 ip6_route_add(&cfg);
1da177e4 1928}
0be669bb 1929#endif
1da177e4 1930
1da177e4
LT		 1931static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1932{
1933 struct inet6_dev *idev;
1934
1935 ASSERT_RTNL();
1936
e21e8467
SH		 1937 idev = ipv6_find_idev(dev);
1938 if (!idev)
64e724f6
BH		 1939 return ERR_PTR(-ENOBUFS);
1940
1941 if (idev->cnf.disable_ipv6)
1942 return ERR_PTR(-EACCES);
1da177e4
LT		 1943
1944 /* Add default multicast route */
4af04aba
LW		 1945 if (!(dev->flags & IFF_LOOPBACK))
1946 addrconf_add_mroute(dev);
1da177e4 1947
1da177e4
LT		 1948 return idev;
1949}
1950
e6bff995 1951void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 1952{
1953 struct prefix_info *pinfo;
1954 __u32 valid_lft;
1955 __u32 prefered_lft;
1956 int addr_type;
1da177e4 1957 struct inet6_dev *in6_dev;
56d417b1 1958 struct net *net = dev_net(dev);
1da177e4
LT		 1959
1960 pinfo = (struct prefix_info *) opt;
1ab1457c 1961
1da177e4
LT		 1962 if (len < sizeof(struct prefix_info)) {
1963 ADBG(("addrconf: prefix option too short\n"));
1964 return;
1965 }
1ab1457c 1966
1da177e4
LT		 1967 /*
1968 * Validation checks ([ADDRCONF], page 19)
1969 */
1970
1971 addr_type = ipv6_addr_type(&pinfo->prefix);
1972
1973 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1974 return;
1975
1976 valid_lft = ntohl(pinfo->valid);
1977 prefered_lft = ntohl(pinfo->prefered);
1978
1979 if (prefered_lft > valid_lft) {
e87cc472 1980 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 1981 return;
1982 }
1983
1984 in6_dev = in6_dev_get(dev);
1985
1986 if (in6_dev == NULL) {
e87cc472
JP		 1987 net_dbg_ratelimited("addrconf: device %s not configured\n",
1988 dev->name);
1da177e4
LT		 1989 return;
1990 }
1991
1992 /*
1993 * Two things going on here:
1994 * 1) Add routes for on-link prefixes
1995 * 2) Configure prefixes with the auto flag set
1996 */
1997
4bed72e4
YH		 1998 if (pinfo->onlink) {
1999 struct rt6_info *rt;
2000 unsigned long rt_expires;
2001
6f704992
YH		 2002 /* Avoid arithmetic overflow. Really, we could
2003 * save rt_expires in seconds, likely valid_lft,
2004 * but it would require division in fib gc, that it
2005 * not good.
2006 */
4bed72e4
YH		 2007 if (HZ > USER_HZ)
2008 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2009 else
2010 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2011
4bed72e4
YH		 2012 if (addrconf_finite_timeout(rt_expires))
2013 rt_expires *= HZ;
1da177e4 2014
14ef37b6
AH		 2015 rt = addrconf_get_prefix_route(&pinfo->prefix,
2016 pinfo->prefix_len,
2017 dev,
2018 RTF_ADDRCONF | RTF_PREFIX_RT,
2019 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2020
14ef37b6 2021 if (rt) {
6f704992
YH		 2022 /* Autoconf prefix route */
2023 if (valid_lft == 0) {
2024 ip6_del_rt(rt);
2025 rt = NULL;
4bed72e4 2026 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2027 /* not infinity */
1716a961 2028 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2029 } else {
1716a961 2030 rt6_clean_expires(rt);
1da177e4
LT		 2031 }
2032 } else if (valid_lft) {
6f704992 2033 clock_t expires = 0;
4bed72e4
YH		 2034 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2035 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2036 /* not infinity */
2037 flags |= RTF_EXPIRES;
2038 expires = jiffies_to_clock_t(rt_expires);
2039 }
1da177e4 2040 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2041 dev, expires, flags);
1da177e4 2042 }
94e187c0 2043 ip6_rt_put(rt);
1da177e4
LT		 2044 }
2045
2046 /* Try to figure out our local address for this prefix */
2047
2048 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2049 struct inet6_ifaddr *ifp;
1da177e4
LT		 2050 struct in6_addr addr;
2051 int create = 0, update_lft = 0;
2052
2053 if (pinfo->prefix_len == 64) {
2054 memcpy(&addr, &pinfo->prefix, 8);
2055 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2056 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2057 in6_dev_put(in6_dev);
2058 return;
2059 }
2060 goto ok;
2061 }
e87cc472
JP		 2062 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2063 pinfo->prefix_len);
1da177e4
LT		 2064 in6_dev_put(in6_dev);
2065 return;
2066
2067ok:
2068
53b7997f 2069 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 2070
2071 if (ifp == NULL && valid_lft) {
2072 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2073 u32 addr_flags = 0;
2074
2075#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2076 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2077 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 2078 addr_flags = IFA_F_OPTIMISTIC;
2079#endif
1da177e4
LT		 2080
2081 /* Do not allow to create too much of autoconfigured
2082 * addresses; this would be too easy way to crash kernel.
2083 */
2084 if (!max_addresses ||
2085 ipv6_count_addresses(in6_dev) < max_addresses)
2086 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 2087 addr_type&IPV6_ADDR_SCOPE_MASK,
2088 addr_flags);
1da177e4 2089
3f0d2ba0 2090 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2091 in6_dev_put(in6_dev);
2092 return;
2093 }
2094
2095 update_lft = create = 1;
2096 ifp->cstamp = jiffies;
cf22f9a2 2097 addrconf_dad_start(ifp);
1da177e4
LT		 2098 }
2099
2100 if (ifp) {
2101 int flags;
2102 unsigned long now;
2103#ifdef CONFIG_IPV6_PRIVACY
2104 struct inet6_ifaddr *ift;
2105#endif
2106 u32 stored_lft;
2107
2108 /* update lifetime (RFC2462 5.5.3 e) */
2109 spin_lock(&ifp->lock);
2110 now = jiffies;
2111 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2112 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2113 else
2114 stored_lft = 0;
2115 if (!update_lft && stored_lft) {
2116 if (valid_lft > MIN_VALID_LIFETIME ||
2117 valid_lft > stored_lft)
2118 update_lft = 1;
2119 else if (stored_lft <= MIN_VALID_LIFETIME) {
2120 /* valid_lft <= stored_lft is always true */
a1ed0526
BH		 2121 /*
2122 * RFC 4862 Section 5.5.3e:
2123 * "Note that the preferred lifetime of
2124 * the corresponding address is always
2125 * reset to the Preferred Lifetime in
2126 * the received Prefix Information
2127 * option, regardless of whether the
2128 * valid lifetime is also reset or
2129 * ignored."
2130 *
2131 * So if the preferred lifetime in
2132 * this advertisement is different
2133 * than what we have stored, but the
2134 * valid lifetime is invalid, just
2135 * reset prefered_lft.
2136 *
2137 * We must set the valid lifetime
2138 * to the stored lifetime since we'll
2139 * be updating the timestamp below,
2140 * else we'll set it back to the
25985edc 2141 * minimum.
a1ed0526
BH		 2142 */
2143 if (prefered_lft != ifp->prefered_lft) {
2144 valid_lft = stored_lft;
2145 update_lft = 1;
2146 }
1da177e4
LT		 2147 } else {
2148 valid_lft = MIN_VALID_LIFETIME;
2149 if (valid_lft < prefered_lft)
2150 prefered_lft = valid_lft;
2151 update_lft = 1;
2152 }
2153 }
2154
2155 if (update_lft) {
2156 ifp->valid_lft = valid_lft;
2157 ifp->prefered_lft = prefered_lft;
2158 ifp->tstamp = now;
2159 flags = ifp->flags;
2160 ifp->flags &= ~IFA_F_DEPRECATED;
2161 spin_unlock(&ifp->lock);
2162
2163 if (!(flags&IFA_F_TENTATIVE))
2164 ipv6_ifa_notify(0, ifp);
2165 } else
2166 spin_unlock(&ifp->lock);
2167
2168#ifdef CONFIG_IPV6_PRIVACY
2169 read_lock_bh(&in6_dev->lock);
2170 /* update all temporary addresses in the list */
76f793e3
LC		 2171 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2172 tmp_list) {
2173 int age, max_valid, max_prefered;
2174
c6fbfac2
BB		 2175 if (ifp != ift->ifpub)
2176 continue;
2177
76f793e3
LC		 2178 /*
2179 * RFC 4941 section 3.3:
2180 * If a received option will extend the lifetime
2181 * of a public address, the lifetimes of
2182 * temporary addresses should be extended,
2183 * subject to the overall constraint that no
2184 * temporary addresses should ever remain
2185 * "valid" or "preferred" for a time longer than
2186 * (TEMP_VALID_LIFETIME) or
2187 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2188 * respectively.
2189 */
2190 age = (now - ift->cstamp) / HZ;
2191 max_valid = in6_dev->cnf.temp_valid_lft - age;
2192 if (max_valid < 0)
2193 max_valid = 0;
2194
2195 max_prefered = in6_dev->cnf.temp_prefered_lft -
2196 in6_dev->cnf.max_desync_factor -
2197 age;
2198 if (max_prefered < 0)
2199 max_prefered = 0;
2200
2201 if (valid_lft > max_valid)
2202 valid_lft = max_valid;
2203
2204 if (prefered_lft > max_prefered)
2205 prefered_lft = max_prefered;
2206
1da177e4
LT		 2207 spin_lock(&ift->lock);
2208 flags = ift->flags;
76f793e3
LC		 2209 ift->valid_lft = valid_lft;
2210 ift->prefered_lft = prefered_lft;
2211 ift->tstamp = now;
2212 if (prefered_lft > 0)
2213 ift->flags &= ~IFA_F_DEPRECATED;
2214
1da177e4
LT		 2215 spin_unlock(&ift->lock);
2216 if (!(flags&IFA_F_TENTATIVE))
2217 ipv6_ifa_notify(0, ift);
2218 }
2219
aed65501 2220 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
1da177e4 2221 /*
76f793e3
LC		 2222 * When a new public address is created as
2223 * described in [ADDRCONF], also create a new
2224 * temporary address. Also create a temporary
2225 * address if it's enabled but no temporary
2226 * address currently exists.
1da177e4 2227 */
1ab1457c 2228 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 2229 ipv6_create_tempaddr(ifp, NULL);
2230 } else {
2231 read_unlock_bh(&in6_dev->lock);
2232 }
2233#endif
2234 in6_ifa_put(ifp);
2235 addrconf_verify(0);
2236 }
2237 }
2238 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2239 in6_dev_put(in6_dev);
2240}
2241
2242/*
2243 * Set destination address.
2244 * Special case for SIT interfaces where we create a new "virtual"
2245 * device.
2246 */
af284937 2247int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2248{
2249 struct in6_ifreq ireq;
2250 struct net_device *dev;
2251 int err = -EINVAL;
2252
2253 rtnl_lock();
2254
2255 err = -EFAULT;
2256 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2257 goto err_exit;
2258
af284937 2259 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2260
2261 err = -ENODEV;
2262 if (dev == NULL)
2263 goto err_exit;
2264
07a93626 2265#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2266 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2267 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2268 struct ifreq ifr;
1da177e4
LT		 2269 struct ip_tunnel_parm p;
2270
2271 err = -EADDRNOTAVAIL;
2272 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2273 goto err_exit;
2274
2275 memset(&p, 0, sizeof(p));
2276 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2277 p.iph.saddr = 0;
2278 p.iph.version = 4;
2279 p.iph.ihl = 5;
2280 p.iph.protocol = IPPROTO_IPV6;
2281 p.iph.ttl = 64;
d20b3109 2282 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2283
5bc3eb7e
SH		 2284 if (ops->ndo_do_ioctl) {
2285 mm_segment_t oldfs = get_fs();
2286
2287 set_fs(KERNEL_DS);
2288 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2289 set_fs(oldfs);
2290 } else
2291 err = -EOPNOTSUPP;
1da177e4
LT		 2292
2293 if (err == 0) {
2294 err = -ENOBUFS;
af284937
DL		 2295 dev = __dev_get_by_name(net, p.name);
2296 if (!dev)
1da177e4
LT		 2297 goto err_exit;
2298 err = dev_open(dev);
2299 }
2300 }
0be669bb 2301#endif
1da177e4
LT		 2302
2303err_exit:
2304 rtnl_unlock();
2305 return err;
2306}
2307
2308/*
2309 * Manual configuration of address on an interface
2310 */
b71d1d42 2311static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2312 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2313 __u32 valid_lft)
1da177e4
LT		 2314{
2315 struct inet6_ifaddr *ifp;
2316 struct inet6_dev *idev;
2317 struct net_device *dev;
2318 int scope;
6f704992
YH		 2319 u32 flags;
2320 clock_t expires;
4bed72e4 2321 unsigned long timeout;
1da177e4
LT		 2322
2323 ASSERT_RTNL();
1ab1457c 2324
24ef0da7
TG		 2325 if (plen > 128)
2326 return -EINVAL;
2327
0778769d
NT		 2328 /* check the lifetime */
2329 if (!valid_lft || prefered_lft > valid_lft)
2330 return -EINVAL;
2331
af284937
DL		 2332 dev = __dev_get_by_index(net, ifindex);
2333 if (!dev)
1da177e4 2334 return -ENODEV;
1ab1457c 2335
64e724f6
BH		 2336 idev = addrconf_add_dev(dev);
2337 if (IS_ERR(idev))
2338 return PTR_ERR(idev);
1da177e4
LT		 2339
2340 scope = ipv6_addr_scope(pfx);
2341
4bed72e4
YH		 2342 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2343 if (addrconf_finite_timeout(timeout)) {
2344 expires = jiffies_to_clock_t(timeout * HZ);
2345 valid_lft = timeout;
6f704992 2346 flags = RTF_EXPIRES;
4bed72e4
YH		 2347 } else {
2348 expires = 0;
2349 flags = 0;
2350 ifa_flags |= IFA_F_PERMANENT;
6f704992 2351 }
0778769d 2352
4bed72e4
YH		 2353 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2354 if (addrconf_finite_timeout(timeout)) {
2355 if (timeout == 0)
2356 ifa_flags |= IFA_F_DEPRECATED;
2357 prefered_lft = timeout;
2358 }
0778769d
NT		 2359
2360 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2361
1da177e4 2362 if (!IS_ERR(ifp)) {
06aebfb7 2363 spin_lock_bh(&ifp->lock);
0778769d
NT		 2364 ifp->valid_lft = valid_lft;
2365 ifp->prefered_lft = prefered_lft;
2366 ifp->tstamp = jiffies;
06aebfb7 2367 spin_unlock_bh(&ifp->lock);
0778769d 2368
46d48046 2369 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2370 expires, flags);
95c385b4
NH		 2371 /*
2372 * Note that section 3.1 of RFC 4429 indicates
2373 * that the Optimistic flag should not be set for
2374 * manually configured addresses
2375 */
cf22f9a2 2376 addrconf_dad_start(ifp);
1da177e4 2377 in6_ifa_put(ifp);
0778769d 2378 addrconf_verify(0);
1da177e4
LT		 2379 return 0;
2380 }
2381
2382 return PTR_ERR(ifp);
2383}
2384
b71d1d42 2385static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2386 unsigned int plen)
1da177e4
LT		 2387{
2388 struct inet6_ifaddr *ifp;
2389 struct inet6_dev *idev;
2390 struct net_device *dev;
1ab1457c 2391
24ef0da7
TG		 2392 if (plen > 128)
2393 return -EINVAL;
2394
af284937
DL		 2395 dev = __dev_get_by_index(net, ifindex);
2396 if (!dev)
1da177e4
LT		 2397 return -ENODEV;
2398
2399 if ((idev = __in6_dev_get(dev)) == NULL)
2400 return -ENXIO;
2401
2402 read_lock_bh(&idev->lock);
502a2ffd 2403 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2404 if (ifp->prefix_len == plen &&
2405 ipv6_addr_equal(pfx, &ifp->addr)) {
2406 in6_ifa_hold(ifp);
2407 read_unlock_bh(&idev->lock);
1ab1457c 2408
1da177e4
LT		 2409 ipv6_del_addr(ifp);
2410
2411 /* If the last address is deleted administratively,
2412 disable IPv6 on this interface.
2413 */
502a2ffd 2414 if (list_empty(&idev->addr_list))
1da177e4
LT		 2415 addrconf_ifdown(idev->dev, 1);
2416 return 0;
2417 }
2418 }
2419 read_unlock_bh(&idev->lock);
2420 return -EADDRNOTAVAIL;
2421}
2422
2423
af284937 2424int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2425{
2426 struct in6_ifreq ireq;
2427 int err;
1ab1457c 2428
af31f412 2429 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2430 return -EPERM;
1ab1457c 2431
1da177e4
LT		 2432 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2433 return -EFAULT;
2434
2435 rtnl_lock();
af284937
DL		 2436 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2437 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2438 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2439 rtnl_unlock();
2440 return err;
2441}
2442
af284937 2443int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2444{
2445 struct in6_ifreq ireq;
2446 int err;
1ab1457c 2447
af31f412 2448 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2449 return -EPERM;
2450
2451 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2452 return -EFAULT;
2453
2454 rtnl_lock();
af284937
DL		 2455 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2456 ireq.ifr6_prefixlen);
1da177e4
LT		 2457 rtnl_unlock();
2458 return err;
2459}
2460
b5f348e5
IJ		 2461static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2462 int plen, int scope)
2463{
2464 struct inet6_ifaddr *ifp;
2465
2466 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2467 if (!IS_ERR(ifp)) {
2468 spin_lock_bh(&ifp->lock);
2469 ifp->flags &= ~IFA_F_TENTATIVE;
2470 spin_unlock_bh(&ifp->lock);
2471 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2472 in6_ifa_put(ifp);
2473 }
2474}
2475
07a93626 2476#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2477static void sit_add_v4_addrs(struct inet6_dev *idev)
2478{
1da177e4
LT		 2479 struct in6_addr addr;
2480 struct net_device *dev;
c346dca1 2481 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2482 int scope;
2483
2484 ASSERT_RTNL();
2485
2486 memset(&addr, 0, sizeof(struct in6_addr));
2487 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2488
2489 if (idev->dev->flags&IFF_POINTOPOINT) {
2490 addr.s6_addr32[0] = htonl(0xfe800000);
2491 scope = IFA_LINK;
2492 } else {
2493 scope = IPV6_ADDR_COMPATv4;
2494 }
2495
2496 if (addr.s6_addr32[3]) {
b5f348e5 2497 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2498 return;
2499 }
2500
6fda7350 2501 for_each_netdev(net, dev) {
8e5e8f30 2502 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2503 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2504 struct in_ifaddr *ifa;
1da177e4
LT		 2505
2506 int flag = scope;
2507
2508 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2509 int plen;
2510
2511 addr.s6_addr32[3] = ifa->ifa_local;
2512
2513 if (ifa->ifa_scope == RT_SCOPE_LINK)
2514 continue;
2515 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2516 if (idev->dev->flags&IFF_POINTOPOINT)
2517 continue;
2518 flag |= IFA_HOST;
2519 }
2520 if (idev->dev->flags&IFF_POINTOPOINT)
2521 plen = 64;
2522 else
2523 plen = 96;
2524
b5f348e5 2525 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2526 }
2527 }
1ab1457c 2528 }
1da177e4 2529}
0be669bb 2530#endif
1da177e4
LT		 2531
2532static void init_loopback(struct net_device *dev)
2533{
2534 struct inet6_dev *idev;
1da177e4
LT		 2535
2536 /* ::1 */
2537
2538 ASSERT_RTNL();
2539
2540 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2541 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2542 return;
2543 }
2544
b5f348e5 2545 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 2546}
2547
b71d1d42 2548static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4 2549{
8e5e8f30 2550 struct inet6_ifaddr *ifp;
95c385b4
NH		 2551 u32 addr_flags = IFA_F_PERMANENT;
2552
2553#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2554 if (idev->cnf.optimistic_dad &&
702beb87 2555 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2556 addr_flags |= IFA_F_OPTIMISTIC;
2557#endif
1da177e4 2558
95c385b4
NH		 2559
2560 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2561 if (!IS_ERR(ifp)) {
46d48046 2562 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2563 addrconf_dad_start(ifp);
1da177e4
LT		 2564 in6_ifa_put(ifp);
2565 }
2566}
2567
2568static void addrconf_dev_config(struct net_device *dev)
2569{
2570 struct in6_addr addr;
8e5e8f30 2571 struct inet6_dev *idev;
1da177e4
LT		 2572
2573 ASSERT_RTNL();
2574
74235a25
HX		 2575 if ((dev->type != ARPHRD_ETHER) &&
2576 (dev->type != ARPHRD_FDDI) &&
74235a25 2577 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 2578 (dev->type != ARPHRD_INFINIBAND) &&
2579 (dev->type != ARPHRD_IEEE802154)) {
74235a25
HX		 2580 /* Alas, we support only Ethernet autoconfiguration. */
2581 return;
2582 }
2583
1da177e4 2584 idev = addrconf_add_dev(dev);
64e724f6 2585 if (IS_ERR(idev))
1da177e4
LT		 2586 return;
2587
2588 memset(&addr, 0, sizeof(struct in6_addr));
2589 addr.s6_addr32[0] = htonl(0xFE800000);
2590
2591 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2592 addrconf_add_linklocal(idev, &addr);
2593}
2594
07a93626 2595#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2596static void addrconf_sit_config(struct net_device *dev)
2597{
2598 struct inet6_dev *idev;
2599
2600 ASSERT_RTNL();
2601
1ab1457c
YH		 2602 /*
2603 * Configure the tunnel with one of our IPv4
2604 * addresses... we should configure all of
1da177e4
LT		 2605 * our v4 addrs in the tunnel
2606 */
2607
2608 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2609 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2610 return;
2611 }
2612
c7dc89c0
FT		 2613 if (dev->priv_flags & IFF_ISATAP) {
2614 struct in6_addr addr;
2615
2616 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2617 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2618 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2619 addrconf_add_linklocal(idev, &addr);
2620 return;
2621 }
2622
1da177e4
LT		 2623 sit_add_v4_addrs(idev);
2624
62b54dd9 2625 if (dev->flags&IFF_POINTOPOINT)
1da177e4 2626 addrconf_add_mroute(dev);
62b54dd9 2627 else
1da177e4
LT		 2628 sit_route_add(dev);
2629}
0be669bb 2630#endif
1da177e4 2631
07a93626 2632#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2633static void addrconf_gre_config(struct net_device *dev)
2634{
2635 struct inet6_dev *idev;
2636 struct in6_addr addr;
2637
f3213831 2638 pr_info("%s(%s)\n", __func__, dev->name);
aee80b54 2639
2640 ASSERT_RTNL();
2641
2642 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2643 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 2644 return;
2645 }
2646
2647 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2648 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2649
2650 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2651 addrconf_add_linklocal(idev, &addr);
2652}
2653#endif
2654
1da177e4
LT		 2655static inline int
2656ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2657{
2658 struct in6_addr lladdr;
2659
95c385b4 2660 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2661 addrconf_add_linklocal(idev, &lladdr);
2662 return 0;
2663 }
2664 return -1;
2665}
2666
2667static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2668{
2669 struct net_device *link_dev;
c346dca1 2670 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2671
2672 /* first try to inherit the link-local address from the link device */
2673 if (idev->dev->iflink &&
6fda7350 2674 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2675 if (!ipv6_inherit_linklocal(idev, link_dev))
2676 return;
2677 }
2678 /* then try to inherit it from any device */
6fda7350 2679 for_each_netdev(net, link_dev) {
1da177e4
LT		 2680 if (!ipv6_inherit_linklocal(idev, link_dev))
2681 return;
2682 }
91df42be 2683 pr_debug("init ip6-ip6: add_linklocal failed\n");
1da177e4
LT		 2684}
2685
2686/*
2687 * Autoconfigure tunnel with a link-local address so routing protocols,
2688 * DHCPv6, MLD etc. can be run over the virtual link
2689 */
2690
2691static void addrconf_ip6_tnl_config(struct net_device *dev)
2692{
2693 struct inet6_dev *idev;
2694
2695 ASSERT_RTNL();
2696
e21e8467 2697 idev = addrconf_add_dev(dev);
64e724f6 2698 if (IS_ERR(idev)) {
91df42be 2699 pr_debug("init ip6-ip6: add_dev failed\n");
1da177e4
LT		 2700 return;
2701 }
2702 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2703}
2704
1ab1457c 2705static int addrconf_notify(struct notifier_block *this, unsigned long event,
8e5e8f30 2706 void *data)
1da177e4
LT		 2707{
2708 struct net_device *dev = (struct net_device *) data;
748e2d93 2709 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2710 int run_pending = 0;
b217d616 2711 int err;
1da177e4 2712
e21e8467 2713 switch (event) {
45ba9dd2 2714 case NETDEV_REGISTER:
74235a25 2715 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2716 idev = ipv6_add_dev(dev);
2717 if (!idev)
b217d616 2718 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2719 }
2720 break;
bcdd553f 2721
1da177e4 2722 case NETDEV_UP:
3c21edbd 2723 case NETDEV_CHANGE:
c2edacf8
JV		 2724 if (dev->flags & IFF_SLAVE)
2725 break;
2726
3c21edbd 2727 if (event == NETDEV_UP) {
f24e3d65 2728 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 2729 /* device is not ready yet. */
f3213831 2730 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 2731 dev->name);
2732 break;
2733 }
99081049 2734
d31c7b8f
EP		 2735 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2736 idev = ipv6_add_dev(dev);
2737
e3ec6cfc 2738 if (idev) {
99081049 2739 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2740 run_pending = 1;
2741 }
3c21edbd 2742 } else {
f24e3d65 2743 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2744 /* device is still not ready. */
2745 break;
2746 }
2747
2748 if (idev) {
bcdd553f 2749 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2750 /* device is already configured. */
2751 break;
3c21edbd
YH		 2752 idev->if_flags |= IF_READY;
2753 }
2754
f3213831
JP		 2755 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2756 dev->name);
3c21edbd 2757
c5e33bdd 2758 run_pending = 1;
3c21edbd
YH		 2759 }
2760
e21e8467 2761 switch (dev->type) {
07a93626 2762#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2763 case ARPHRD_SIT:
2764 addrconf_sit_config(dev);
2765 break;
aee80b54 2766#endif
07a93626 2767#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2768 case ARPHRD_IPGRE:
2769 addrconf_gre_config(dev);
2770 break;
0be669bb 2771#endif
1da177e4
LT		 2772 case ARPHRD_TUNNEL6:
2773 addrconf_ip6_tnl_config(dev);
2774 break;
2775 case ARPHRD_LOOPBACK:
2776 init_loopback(dev);
2777 break;
2778
2779 default:
2780 addrconf_dev_config(dev);
2781 break;
3ff50b79 2782 }
bcdd553f 2783
1da177e4 2784 if (idev) {
c5e33bdd
YH		 2785 if (run_pending)
2786 addrconf_dad_run(idev);
2787
bcdd553f
SH		 2788 /*
2789 * If the MTU changed during the interface down,
2790 * when the interface up, the changed MTU must be
2791 * reflected in the idev as well as routers.
1da177e4 2792 */
bcdd553f
SH		 2793 if (idev->cnf.mtu6 != dev->mtu &&
2794 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2795 rt6_mtu_change(dev, dev->mtu);
2796 idev->cnf.mtu6 = dev->mtu;
2797 }
2798 idev->tstamp = jiffies;
2799 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2800
2801 /*
2802 * If the changed mtu during down is lower than
2803 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2804 */
2805 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2806 addrconf_ifdown(dev, 1);
1da177e4
LT		 2807 }
2808 break;
2809
2810 case NETDEV_CHANGEMTU:
d31c7b8f 2811 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2812 rt6_mtu_change(dev, dev->mtu);
2813 idev->cnf.mtu6 = dev->mtu;
2814 break;
2815 }
2816
d31c7b8f
EP		 2817 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2818 idev = ipv6_add_dev(dev);
2819 if (idev)
2820 break;
2821 }
2822
bcdd553f
SH		 2823 /*
2824 * MTU falled under IPV6_MIN_MTU.
2825 * Stop IPv6 on this interface.
2826 */
1da177e4
LT		 2827
2828 case NETDEV_DOWN:
2829 case NETDEV_UNREGISTER:
2830 /*
2831 * Remove all addresses from this interface.
2832 */
2833 addrconf_ifdown(dev, event != NETDEV_DOWN);
2834 break;
3c21edbd 2835
1da177e4 2836 case NETDEV_CHANGENAME:
1da177e4 2837 if (idev) {
5632c515 2838 snmp6_unregister_dev(idev);
408c4768 2839 addrconf_sysctl_unregister(idev);
f52295a9 2840 addrconf_sysctl_register(idev);
b217d616
HX		 2841 err = snmp6_register_dev(idev);
2842 if (err)
2843 return notifier_from_errno(err);
5632c515 2844 }
1da177e4 2845 break;
bcdd553f 2846
93d9b7d7
JP		 2847 case NETDEV_PRE_TYPE_CHANGE:
2848 case NETDEV_POST_TYPE_CHANGE:
2849 addrconf_type_change(dev, event);
75c78500 2850 break;
3ff50b79 2851 }
1da177e4
LT		 2852
2853 return NOTIFY_OK;
2854}
2855
2856/*
2857 * addrconf module should be notified of a device going up
2858 */
2859static struct notifier_block ipv6_dev_notf = {
2860 .notifier_call = addrconf_notify,
1da177e4
LT		 2861};
2862
93d9b7d7 2863static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2864{
2865 struct inet6_dev *idev;
2866 ASSERT_RTNL();
2867
2868 idev = __in6_dev_get(dev);
2869
93d9b7d7 2870 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2871 ipv6_mc_remap(idev);
93d9b7d7 2872 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2873 ipv6_mc_unmap(idev);
2874}
2875
1da177e4
LT		 2876static int addrconf_ifdown(struct net_device *dev, int how)
2877{
c346dca1 2878 struct net *net = dev_net(dev);
502a2ffd 2879 struct inet6_dev *idev;
2880 struct inet6_ifaddr *ifa;
73a8bd74 2881 int state, i;
1da177e4
LT		 2882
2883 ASSERT_RTNL();
2884
73a8bd74
DM		 2885 rt6_ifdown(net, dev);
2886 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 2887
2888 idev = __in6_dev_get(dev);
2889 if (idev == NULL)
2890 return -ENODEV;
2891
bcdd553f
SH		 2892 /*
2893 * Step 1: remove reference to ipv6 device from parent device.
2894 * Do not dev_put!
1da177e4 2895 */
439e2385 2896 if (how) {
1da177e4 2897 idev->dead = 1;
8814c4b5
YH		 2898
2899 /* protected by rtnl_lock */
a9b3cd7f 2900 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 2901
2902 /* Step 1.5: remove snmp6 entry */
2903 snmp6_unregister_dev(idev);
2904
2905 }
2906
73a8bd74
DM		 2907 /* Step 2: clear hash table */
2908 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2909 struct hlist_head *h = &inet6_addr_lst[i];
2910 struct hlist_node *n;
2911
2912 spin_lock_bh(&addrconf_hash_lock);
2913 restart:
2914 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2915 if (ifa->idev == idev) {
2916 hlist_del_init_rcu(&ifa->addr_lst);
2917 addrconf_del_timer(ifa);
2918 goto restart;
2919 }
2920 }
2921 spin_unlock_bh(&addrconf_hash_lock);
2922 }
2923
1da177e4
LT		 2924 write_lock_bh(&idev->lock);
2925
bcdd553f 2926 /* Step 2: clear flags for stateless addrconf */
439e2385 2927 if (!how)
3c21edbd 2928 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 2929
1da177e4 2930#ifdef CONFIG_IPV6_PRIVACY
439e2385 2931 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2932 in6_dev_put(idev);
2933
bcdd553f 2934 /* Step 3: clear tempaddr list */
372e6c8f 2935 while (!list_empty(&idev->tempaddr_list)) {
2936 ifa = list_first_entry(&idev->tempaddr_list,
2937 struct inet6_ifaddr, tmp_list);
2938 list_del(&ifa->tmp_list);
1da177e4
LT		 2939 write_unlock_bh(&idev->lock);
2940 spin_lock_bh(&ifa->lock);
2941
2942 if (ifa->ifpub) {
2943 in6_ifa_put(ifa->ifpub);
2944 ifa->ifpub = NULL;
2945 }
2946 spin_unlock_bh(&ifa->lock);
2947 in6_ifa_put(ifa);
2948 write_lock_bh(&idev->lock);
2949 }
2950#endif
8f37ada5 2951
502a2ffd 2952 while (!list_empty(&idev->addr_list)) {
2953 ifa = list_first_entry(&idev->addr_list,
2954 struct inet6_ifaddr, if_list);
84e8b803 2955 addrconf_del_timer(ifa);
2956
73a8bd74 2957 list_del(&ifa->if_list);
84e8b803 2958
73a8bd74 2959 write_unlock_bh(&idev->lock);
84e8b803 2960
73a8bd74
DM		 2961 spin_lock_bh(&ifa->state_lock);
2962 state = ifa->state;
2963 ifa->state = INET6_IFADDR_STATE_DEAD;
2964 spin_unlock_bh(&ifa->state_lock);
9d82ca98 2965
73a8bd74
DM		 2966 if (state != INET6_IFADDR_STATE_DEAD) {
2967 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2968 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
27bdb2ab 2969 }
73a8bd74 2970 in6_ifa_put(ifa);
8f37ada5 2971
73a8bd74
DM		 2972 write_lock_bh(&idev->lock);
2973 }
8f37ada5 2974
1da177e4
LT		 2975 write_unlock_bh(&idev->lock);
2976
2977 /* Step 5: Discard multicast list */
439e2385 2978 if (how)
1da177e4
LT		 2979 ipv6_mc_destroy_dev(idev);
2980 else
2981 ipv6_mc_down(idev);
2982
1da177e4 2983 idev->tstamp = jiffies;
1ab1457c 2984
bcdd553f 2985 /* Last: Shot the device (if unregistered) */
439e2385 2986 if (how) {
408c4768 2987 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2988 neigh_parms_release(&nd_tbl, idev->nd_parms);
2989 neigh_ifdown(&nd_tbl, dev);
2990 in6_dev_put(idev);
2991 }
2992 return 0;
2993}
2994
2995static void addrconf_rs_timer(unsigned long data)
2996{
2997 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
5b2a1953 2998 struct inet6_dev *idev = ifp->idev;
1da177e4 2999
5b2a1953 3000 read_lock(&idev->lock);
3001 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3002 goto out;
3003
9ba2add3 3004 if (!ipv6_accept_ra(idev))
5b2a1953 3005 goto out;
3006
3007 /* Announcement received after solicitation was sent */
3008 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3009 goto out;
1da177e4
LT		 3010
3011 spin_lock(&ifp->lock);
5b2a1953 3012 if (ifp->probes++ < idev->cnf.rtr_solicits) {
1da177e4
LT		 3013 /* The wait after the last probe can be shorter */
3014 addrconf_mod_timer(ifp, AC_RS,
5b2a1953 3015 (ifp->probes == idev->cnf.rtr_solicits) ?
3016 idev->cnf.rtr_solicit_delay :
3017 idev->cnf.rtr_solicit_interval);
1da177e4
LT		 3018 spin_unlock(&ifp->lock);
3019
5b2a1953 3020 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 3021 } else {
3022 spin_unlock(&ifp->lock);
3023 /*
3024 * Note: we do not support deprecated "all on-link"
3025 * assumption any longer.
3026 */
91df42be 3027 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3028 }
3029
3030out:
5b2a1953 3031 read_unlock(&idev->lock);
1da177e4
LT		 3032 in6_ifa_put(ifp);
3033}
3034
3035/*
3036 * Duplicate Address Detection
3037 */
3c21edbd
YH		 3038static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3039{
3040 unsigned long rand_num;
3041 struct inet6_dev *idev = ifp->idev;
3042
95c385b4
NH		 3043 if (ifp->flags & IFA_F_OPTIMISTIC)
3044 rand_num = 0;
3045 else
3046 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3047
3c21edbd
YH		 3048 ifp->probes = idev->cnf.dad_transmits;
3049 addrconf_mod_timer(ifp, AC_DAD, rand_num);
3050}
3051
cf22f9a2 3052static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4
LT		 3053{
3054 struct inet6_dev *idev = ifp->idev;
3055 struct net_device *dev = idev->dev;
1da177e4
LT		 3056
3057 addrconf_join_solict(dev, &ifp->addr);
3058
1da177e4 3059 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 3060
3061 read_lock_bh(&idev->lock);
622ccdf1 3062 spin_lock(&ifp->lock);
e9d3e084 3063 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3064 goto out;
1da177e4
LT		 3065
3066 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3067 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3068 !(ifp->flags&IFA_F_TENTATIVE) ||
3069 ifp->flags & IFA_F_NODAD) {
cc411d0b 3070 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3071 spin_unlock(&ifp->lock);
1da177e4
LT		 3072 read_unlock_bh(&idev->lock);
3073
3074 addrconf_dad_completed(ifp);
3075 return;
3076 }
3077
6732bade 3078 if (!(idev->if_flags & IF_READY)) {
21809faf 3079 spin_unlock(&ifp->lock);
6732bade 3080 read_unlock_bh(&idev->lock);
3c21edbd 3081 /*
590a9887 3082 * If the device is not ready:
3c21edbd
YH		 3083 * - keep it tentative if it is a permanent address.
3084 * - otherwise, kill it.
3085 */
3086 in6_ifa_hold(ifp);
cc411d0b 3087 addrconf_dad_stop(ifp, 0);
6732bade 3088 return;
3c21edbd 3089 }
95c385b4
NH		 3090
3091 /*
3092 * Optimistic nodes can start receiving
3093 * Frames right away
3094 */
e21e8467 3095 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 3096 ip6_ins_rt(ifp->rt);
3097
6732bade 3098 addrconf_dad_kick(ifp);
1da177e4 3099out:
622ccdf1 3100 spin_unlock(&ifp->lock);
1da177e4
LT		 3101 read_unlock_bh(&idev->lock);
3102}
3103
3104static void addrconf_dad_timer(unsigned long data)
3105{
3106 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3107 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3108 struct in6_addr mcaddr;
3109
f2344a13
HX		 3110 if (!ifp->probes && addrconf_dad_end(ifp))
3111 goto out;
3112
122e4519 3113 read_lock(&idev->lock);
3114 if (idev->dead || !(idev->if_flags & IF_READY)) {
3115 read_unlock(&idev->lock);
1da177e4
LT		 3116 goto out;
3117 }
21809faf 3118
3119 spin_lock(&ifp->lock);
622ccdf1
HX		 3120 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3121 spin_unlock(&ifp->lock);
3122 read_unlock(&idev->lock);
3123 goto out;
3124 }
3125
1da177e4
LT		 3126 if (ifp->probes == 0) {
3127 /*
3128 * DAD was successful
3129 */
3130
cc411d0b 3131 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3132 spin_unlock(&ifp->lock);
122e4519 3133 read_unlock(&idev->lock);
1da177e4
LT		 3134
3135 addrconf_dad_completed(ifp);
3136
3137 goto out;
3138 }
3139
3140 ifp->probes--;
3141 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
21809faf 3142 spin_unlock(&ifp->lock);
122e4519 3143 read_unlock(&idev->lock);
1da177e4
LT		 3144
3145 /* send a neighbour solicitation for our addr */
1da177e4 3146 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3147 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3148out:
3149 in6_ifa_put(ifp);
3150}
3151
3152static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3153{
e21e8467 3154 struct net_device *dev = ifp->idev->dev;
1da177e4
LT		 3155
3156 /*
3157 * Configure the address for reception. Now it is valid.
3158 */
3159
3160 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3161
026359bc
TA		 3162 /* If added prefix is link local and we are prepared to process
3163 router advertisements, start sending router solicitations.
1da177e4
LT		 3164 */
3165
aeaf6e9d 3166 if (ipv6_accept_ra(ifp->idev) &&
1da177e4
LT		 3167 ifp->idev->cnf.rtr_solicits > 0 &&
3168 (dev->flags&IFF_LOOPBACK) == 0 &&
3169 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 3170 /*
3171 * If a host as already performed a random delay
3172 * [...] as part of DAD [...] there is no need
3173 * to delay again before sending the first RS
3174 */
f3ee4010 3175 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 3176
3177 spin_lock_bh(&ifp->lock);
3178 ifp->probes = 1;
3179 ifp->idev->if_flags |= IF_RS_SENT;
3180 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3181 spin_unlock_bh(&ifp->lock);
3182 }
3183}
3184
e21e8467
SH		 3185static void addrconf_dad_run(struct inet6_dev *idev)
3186{
c5e33bdd
YH		 3187 struct inet6_ifaddr *ifp;
3188
3189 read_lock_bh(&idev->lock);
502a2ffd 3190 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3191 spin_lock(&ifp->lock);
f2344a13
HX		 3192 if (ifp->flags & IFA_F_TENTATIVE &&
3193 ifp->state == INET6_IFADDR_STATE_DAD)
3194 addrconf_dad_kick(ifp);
21809faf 3195 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3196 }
3197 read_unlock_bh(&idev->lock);
3198}
3199
1da177e4
LT		 3200#ifdef CONFIG_PROC_FS
3201struct if6_iter_state {
3c40090a 3202 struct seq_net_private p;
1da177e4 3203 int bucket;
1d578303 3204 int offset;
1da177e4
LT		 3205};
3206
1d578303 3207static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3208{
3209 struct inet6_ifaddr *ifa = NULL;
3210 struct if6_iter_state *state = seq->private;
1218854a 3211 struct net *net = seq_file_net(seq);
1d578303 3212 int p = 0;
1da177e4 3213
1d578303
MM		 3214 /* initial bucket if pos is 0 */
3215 if (pos == 0) {
3216 state->bucket = 0;
3217 state->offset = 0;
3218 }
3219
3220 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
c2e21293 3221 struct hlist_node *n;
4f70ecca 3222 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
1d578303 3223 addr_lst) {
9f0d3c27
ED		 3224 if (!net_eq(dev_net(ifa->idev->dev), net))
3225 continue;
1d578303
MM		 3226 /* sync with offset */
3227 if (p < state->offset) {
3228 p++;
3229 continue;
3230 }
3231 state->offset++;
9f0d3c27 3232 return ifa;
1d578303
MM		 3233 }
3234
3235 /* prepare for next bucket */
3236 state->offset = 0;
3237 p = 0;
1da177e4 3238 }
c2e21293 3239 return NULL;
1da177e4
LT		 3240}
3241
c2e21293 3242static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3243 struct inet6_ifaddr *ifa)
1da177e4
LT		 3244{
3245 struct if6_iter_state *state = seq->private;
1218854a 3246 struct net *net = seq_file_net(seq);
c2e21293 3247 struct hlist_node *n = &ifa->addr_lst;
1da177e4 3248
1d578303 3249 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) {
9f0d3c27
ED		 3250 if (!net_eq(dev_net(ifa->idev->dev), net))
3251 continue;
1d578303 3252 state->offset++;
9f0d3c27 3253 return ifa;
1d578303 3254 }
3c40090a 3255
c2e21293 3256 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3257 state->offset = 0;
4f70ecca 3258 hlist_for_each_entry_rcu_bh(ifa, n,
c2e21293 3259 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3260 if (!net_eq(dev_net(ifa->idev->dev), net))
3261 continue;
1d578303 3262 state->offset++;
9f0d3c27 3263 return ifa;
c2e21293 3264 }
1da177e4 3265 }
3c40090a 3266
c2e21293 3267 return NULL;
1da177e4
LT		 3268}
3269
1da177e4 3270static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3271 __acquires(rcu_bh)
1da177e4 3272{
5c578aed 3273 rcu_read_lock_bh();
1d578303 3274 return if6_get_first(seq, *pos);
1da177e4
LT		 3275}
3276
3277static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3278{
3279 struct inet6_ifaddr *ifa;
3280
3281 ifa = if6_get_next(seq, v);
3282 ++*pos;
3283 return ifa;
3284}
3285
3286static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3287 __releases(rcu_bh)
1da177e4 3288{
5c578aed 3289 rcu_read_unlock_bh();
1da177e4
LT		 3290}
3291
3292static int if6_seq_show(struct seq_file *seq, void *v)
3293{
3294 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3295 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3296 &ifp->addr,
1da177e4
LT		 3297 ifp->idev->dev->ifindex,
3298 ifp->prefix_len,
3299 ifp->scope,
3300 ifp->flags,
3301 ifp->idev->dev->name);
3302 return 0;
3303}
3304
56b3d975 3305static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3306 .start = if6_seq_start,
3307 .next = if6_seq_next,
3308 .show = if6_seq_show,
3309 .stop = if6_seq_stop,
3310};
3311
3312static int if6_seq_open(struct inode *inode, struct file *file)
3313{
3c40090a
DL		 3314 return seq_open_net(inode, file, &if6_seq_ops,
3315 sizeof(struct if6_iter_state));
1da177e4
LT		 3316}
3317
9a32144e 3318static const struct file_operations if6_fops = {
1da177e4
LT		 3319 .owner = THIS_MODULE,
3320 .open = if6_seq_open,
3321 .read = seq_read,
3322 .llseek = seq_lseek,
3c40090a 3323 .release = seq_release_net,
1da177e4
LT		 3324};
3325
2c8c1e72 3326static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3327{
d4beaa66 3328 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 3329 return -ENOMEM;
3330 return 0;
3331}
3332
2c8c1e72 3333static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 3334{
ece31ffd 3335 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 3336}
3337
3338static struct pernet_operations if6_proc_net_ops = {
3339 .init = if6_proc_net_init,
3340 .exit = if6_proc_net_exit,
3341};
3342
3343int __init if6_proc_init(void)
3344{
3345 return register_pernet_subsys(&if6_proc_net_ops);
3346}
3347
1da177e4
LT		 3348void if6_proc_exit(void)
3349{
3c40090a 3350 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3351}
3352#endif /* CONFIG_PROC_FS */
3353
07a93626 3354#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3355/* Check if address is a home address configured on any interface. */
b71d1d42 3356int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3357{
3358 int ret = 0;
c2e21293 3359 struct inet6_ifaddr *ifp = NULL;
3360 struct hlist_node *n;
ddbe5032 3361 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3362
5c578aed 3363 rcu_read_lock_bh();
4f70ecca 3364 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
878628fb 3365 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3366 continue;
caad295f 3367 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3368 (ifp->flags & IFA_F_HOMEADDRESS)) {
3369 ret = 1;
3370 break;
3371 }
3372 }
5c578aed 3373 rcu_read_unlock_bh();
3b9f9a1c
NT		 3374 return ret;
3375}
3376#endif
3377
1da177e4
LT		 3378/*
3379 * Periodic address status verification
3380 */
3381
3382static void addrconf_verify(unsigned long foo)
3383{
b2db7564 3384 unsigned long now, next, next_sec, next_sched;
1da177e4 3385 struct inet6_ifaddr *ifp;
c2e21293 3386 struct hlist_node *node;
1da177e4
LT		 3387 int i;
3388
5c578aed 3389 rcu_read_lock_bh();
3390 spin_lock(&addrconf_verify_lock);
1da177e4 3391 now = jiffies;
b2db7564 3392 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4
LT		 3393
3394 del_timer(&addr_chk_timer);
3395
bcdd553f 3396 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3397restart:
4f70ecca 3398 hlist_for_each_entry_rcu_bh(ifp, node,
5c578aed 3399 &inet6_addr_lst[i], addr_lst) {
1da177e4 3400 unsigned long age;
1da177e4
LT		 3401
3402 if (ifp->flags & IFA_F_PERMANENT)
3403 continue;
3404
3405 spin_lock(&ifp->lock);
b2db7564
YH		 3406 /* We try to batch several events at once. */
3407 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3408
8f27ebb9
YH		 3409 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3410 age >= ifp->valid_lft) {
1da177e4
LT		 3411 spin_unlock(&ifp->lock);
3412 in6_ifa_hold(ifp);
1da177e4
LT		 3413 ipv6_del_addr(ifp);
3414 goto restart;
8f27ebb9
YH		 3415 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3416 spin_unlock(&ifp->lock);
3417 continue;
1da177e4 3418 } else if (age >= ifp->prefered_lft) {
a1ed0526 3419 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3420 int deprecate = 0;
3421
3422 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3423 deprecate = 1;
3424 ifp->flags |= IFA_F_DEPRECATED;
3425 }
3426
3427 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3428 next = ifp->tstamp + ifp->valid_lft * HZ;
3429
3430 spin_unlock(&ifp->lock);
3431
3432 if (deprecate) {
3433 in6_ifa_hold(ifp);
1da177e4
LT		 3434
3435 ipv6_ifa_notify(0, ifp);
3436 in6_ifa_put(ifp);
3437 goto restart;
3438 }
3439#ifdef CONFIG_IPV6_PRIVACY
3440 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3441 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3442 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3443 ifp->idev->cnf.dad_transmits *
3444 ifp->idev->nd_parms->retrans_time / HZ;
3445
1da177e4
LT		 3446 if (age >= ifp->prefered_lft - regen_advance) {
3447 struct inet6_ifaddr *ifpub = ifp->ifpub;
3448 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3449 next = ifp->tstamp + ifp->prefered_lft * HZ;
3450 if (!ifp->regen_count && ifpub) {
3451 ifp->regen_count++;
3452 in6_ifa_hold(ifp);
3453 in6_ifa_hold(ifpub);
3454 spin_unlock(&ifp->lock);
5c578aed 3455
291d809b
HY		 3456 spin_lock(&ifpub->lock);
3457 ifpub->regen_count = 0;
3458 spin_unlock(&ifpub->lock);
1da177e4
LT		 3459 ipv6_create_tempaddr(ifpub, ifp);
3460 in6_ifa_put(ifpub);
3461 in6_ifa_put(ifp);
3462 goto restart;
3463 }
3464 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3465 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3466 spin_unlock(&ifp->lock);
3467#endif
3468 } else {
3469 /* ifp->prefered_lft <= ifp->valid_lft */
3470 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3471 next = ifp->tstamp + ifp->prefered_lft * HZ;
3472 spin_unlock(&ifp->lock);
3473 }
3474 }
1da177e4
LT		 3475 }
3476
b2db7564
YH		 3477 next_sec = round_jiffies_up(next);
3478 next_sched = next;
3479
3480 /* If rounded timeout is accurate enough, accept it. */
3481 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3482 next_sched = next_sec;
3483
3484 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3485 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3486 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3487
3488 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3489 now, next, next_sec, next_sched));
3490
3491 addr_chk_timer.expires = next_sched;
1da177e4 3492 add_timer(&addr_chk_timer);
5c578aed 3493 spin_unlock(&addrconf_verify_lock);
3494 rcu_read_unlock_bh();
1da177e4
LT		 3495}
3496
461d8837
TG		 3497static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3498{
3499 struct in6_addr *pfx = NULL;
3500
3501 if (addr)
3502 pfx = nla_data(addr);
3503
3504 if (local) {
3505 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3506 pfx = NULL;
3507 else
3508 pfx = nla_data(local);
3509 }
3510
3511 return pfx;
3512}
3513
ef7c79ed 3514static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3515 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3516 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3517 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3518};
3519
1da177e4
LT		 3520static int
3521inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3522{
3b1e0a65 3523 struct net *net = sock_net(skb->sk);
b933f716
TG		 3524 struct ifaddrmsg *ifm;
3525 struct nlattr *tb[IFA_MAX+1];
1da177e4 3526 struct in6_addr *pfx;
b933f716 3527 int err;
1da177e4 3528
b933f716
TG		 3529 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3530 if (err < 0)
3531 return err;
3532
3533 ifm = nlmsg_data(nlh);
3534 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3535 if (pfx == NULL)
3536 return -EINVAL;
3537
af284937 3538 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3539}
3540
55ebaef1
NT		 3541static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3542 u32 prefered_lft, u32 valid_lft)
081bba5b 3543{
6f704992
YH		 3544 u32 flags;
3545 clock_t expires;
4bed72e4 3546 unsigned long timeout;
46d48046 3547
081bba5b
NT		 3548 if (!valid_lft || (prefered_lft > valid_lft))
3549 return -EINVAL;
3550
4bed72e4
YH		 3551 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3552 if (addrconf_finite_timeout(timeout)) {
3553 expires = jiffies_to_clock_t(timeout * HZ);
3554 valid_lft = timeout;
6f704992 3555 flags = RTF_EXPIRES;
4bed72e4
YH		 3556 } else {
3557 expires = 0;
3558 flags = 0;
3559 ifa_flags |= IFA_F_PERMANENT;
6f704992 3560 }
081bba5b 3561
4bed72e4
YH		 3562 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3563 if (addrconf_finite_timeout(timeout)) {
3564 if (timeout == 0)
3565 ifa_flags |= IFA_F_DEPRECATED;
3566 prefered_lft = timeout;
3567 }
081bba5b
NT		 3568
3569 spin_lock_bh(&ifp->lock);
3b9f9a1c 3570 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3571 ifp->tstamp = jiffies;
3572 ifp->valid_lft = valid_lft;
3573 ifp->prefered_lft = prefered_lft;
3574
3575 spin_unlock_bh(&ifp->lock);
3576 if (!(ifp->flags&IFA_F_TENTATIVE))
3577 ipv6_ifa_notify(0, ifp);
081bba5b 3578
46d48046 3579 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3580 expires, flags);
081bba5b
NT		 3581 addrconf_verify(0);
3582
3583 return 0;
3584}
3585
1da177e4
LT		 3586static int
3587inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3588{
3b1e0a65 3589 struct net *net = sock_net(skb->sk);
461d8837
TG		 3590 struct ifaddrmsg *ifm;
3591 struct nlattr *tb[IFA_MAX+1];
1da177e4 3592 struct in6_addr *pfx;
7198f8ce
TG		 3593 struct inet6_ifaddr *ifa;
3594 struct net_device *dev;
55ebaef1
NT		 3595 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3596 u8 ifa_flags;
461d8837 3597 int err;
1da177e4 3598
461d8837
TG		 3599 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3600 if (err < 0)
3601 return err;
3602
3603 ifm = nlmsg_data(nlh);
3604 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3605 if (pfx == NULL)
3606 return -EINVAL;
3607
461d8837 3608 if (tb[IFA_CACHEINFO]) {
0778769d 3609 struct ifa_cacheinfo *ci;
461d8837
TG		 3610
3611 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3612 valid_lft = ci->ifa_valid;
461d8837
TG		 3613 preferred_lft = ci->ifa_prefered;
3614 } else {
3615 preferred_lft = INFINITY_LIFE_TIME;
3616 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3617 }
3618
af284937 3619 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3620 if (dev == NULL)
3621 return -ENODEV;
3622
55ebaef1 3623 /* We ignore other flags so far. */
3b9f9a1c 3624 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3625
1cab3da6 3626 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3627 if (ifa == NULL) {
3628 /*
3629 * It would be best to check for !NLM_F_CREATE here but
3630 * userspace alreay relies on not having to provide this.
3631 */
af284937
DL		 3632 return inet6_addr_add(net, ifm->ifa_index, pfx,
3633 ifm->ifa_prefixlen, ifa_flags,
3634 preferred_lft, valid_lft);
081bba5b
NT		 3635 }
3636
7198f8ce
TG		 3637 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3638 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3639 err = -EEXIST;
3640 else
55ebaef1 3641 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3642
3643 in6_ifa_put(ifa);
3644
3645 return err;
1da177e4
LT		 3646}
3647
101bb229
TG		 3648static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3649 u8 scope, int ifindex)
3650{
3651 struct ifaddrmsg *ifm;
3652
3653 ifm = nlmsg_data(nlh);
3654 ifm->ifa_family = AF_INET6;
3655 ifm->ifa_prefixlen = prefixlen;
3656 ifm->ifa_flags = flags;
3657 ifm->ifa_scope = scope;
3658 ifm->ifa_index = ifindex;
3659}
3660
85486af0
TG		 3661static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3662 unsigned long tstamp, u32 preferred, u32 valid)
3663{
3664 struct ifa_cacheinfo ci;
3665
18a31e1e
TG		 3666 ci.cstamp = cstamp_delta(cstamp);
3667 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 3668 ci.ifa_prefered = preferred;
3669 ci.ifa_valid = valid;
3670
3671 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3672}
3673
101bb229
TG		 3674static inline int rt_scope(int ifa_scope)
3675{
3676 if (ifa_scope & IFA_HOST)
3677 return RT_SCOPE_HOST;
3678 else if (ifa_scope & IFA_LINK)
3679 return RT_SCOPE_LINK;
3680 else if (ifa_scope & IFA_SITE)
3681 return RT_SCOPE_SITE;
3682 else
3683 return RT_SCOPE_UNIVERSE;
3684}
3685
0ab6803b
TG		 3686static inline int inet6_ifaddr_msgsize(void)
3687{
339bf98f
TG		 3688 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3689 + nla_total_size(16) /* IFA_ADDRESS */
3690 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3691}
c5396a31 3692
1da177e4 3693static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 3694 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3695{
1da177e4 3696 struct nlmsghdr *nlh;
85486af0 3697 u32 preferred, valid;
1da177e4 3698
15e47304 3699 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3700 if (nlh == NULL)
26932566 3701 return -EMSGSIZE;
0ab6803b 3702
101bb229
TG		 3703 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3704 ifa->idev->dev->ifindex);
3705
1da177e4 3706 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3707 preferred = ifa->prefered_lft;
3708 valid = ifa->valid_lft;
3709 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3710 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3711 if (preferred > tval)
3712 preferred -= tval;
3713 else
3714 preferred = 0;
f56619fc
BH		 3715 if (valid != INFINITY_LIFE_TIME) {
3716 if (valid > tval)
3717 valid -= tval;
3718 else
3719 valid = 0;
3720 }
1da177e4
LT		 3721 }
3722 } else {
85486af0
TG		 3723 preferred = INFINITY_LIFE_TIME;
3724 valid = INFINITY_LIFE_TIME;
3725 }
3726
0ab6803b 3727 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3728 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3729 nlmsg_cancel(skb, nlh);
3730 return -EMSGSIZE;
3731 }
1da177e4 3732
0ab6803b 3733 return nlmsg_end(skb, nlh);
1da177e4
LT		 3734}
3735
3736static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 3737 u32 portid, u32 seq, int event, u16 flags)
1da177e4 3738{
1da177e4 3739 struct nlmsghdr *nlh;
101bb229
TG		 3740 u8 scope = RT_SCOPE_UNIVERSE;
3741 int ifindex = ifmca->idev->dev->ifindex;
3742
3743 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3744 scope = RT_SCOPE_SITE;
1da177e4 3745
15e47304 3746 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3747 if (nlh == NULL)
26932566 3748 return -EMSGSIZE;
85486af0 3749
0ab6803b
TG		 3750 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3751 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3752 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3753 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3754 nlmsg_cancel(skb, nlh);
3755 return -EMSGSIZE;
3756 }
85486af0 3757
0ab6803b 3758 return nlmsg_end(skb, nlh);
1da177e4
LT		 3759}
3760
3761static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 3762 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3763{
1da177e4 3764 struct nlmsghdr *nlh;
101bb229
TG		 3765 u8 scope = RT_SCOPE_UNIVERSE;
3766 int ifindex = ifaca->aca_idev->dev->ifindex;
3767
3768 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3769 scope = RT_SCOPE_SITE;
1da177e4 3770
15e47304 3771 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3772 if (nlh == NULL)
26932566 3773 return -EMSGSIZE;
85486af0 3774
0ab6803b
TG		 3775 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3776 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3777 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3778 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3779 nlmsg_cancel(skb, nlh);
3780 return -EMSGSIZE;
3781 }
1da177e4 3782
0ab6803b 3783 return nlmsg_end(skb, nlh);
1da177e4
LT		 3784}
3785
e21e8467 3786enum addr_type_t {
1da177e4
LT		 3787 UNICAST_ADDR,
3788 MULTICAST_ADDR,
3789 ANYCAST_ADDR,
3790};
3791
234b27c3
ED		 3792/* called with rcu_read_lock() */
3793static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3794 struct netlink_callback *cb, enum addr_type_t type,
3795 int s_ip_idx, int *p_ip_idx)
3796{
234b27c3
ED		 3797 struct ifmcaddr6 *ifmca;
3798 struct ifacaddr6 *ifaca;
3799 int err = 1;
3800 int ip_idx = *p_ip_idx;
3801
3802 read_lock_bh(&idev->lock);
3803 switch (type) {
502a2ffd 3804 case UNICAST_ADDR: {
3805 struct inet6_ifaddr *ifa;
3806
234b27c3 3807 /* unicast address incl. temp addr */
502a2ffd 3808 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3809 if (++ip_idx < s_ip_idx)
234b27c3
ED		 3810 continue;
3811 err = inet6_fill_ifaddr(skb, ifa,
15e47304 3812 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3813 cb->nlh->nlmsg_seq,
3814 RTM_NEWADDR,
3815 NLM_F_MULTI);
3816 if (err <= 0)
3817 break;
3818 }
3819 break;
502a2ffd 3820 }
234b27c3
ED		 3821 case MULTICAST_ADDR:
3822 /* multicast address */
3823 for (ifmca = idev->mc_list; ifmca;
3824 ifmca = ifmca->next, ip_idx++) {
3825 if (ip_idx < s_ip_idx)
3826 continue;
3827 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 3828 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3829 cb->nlh->nlmsg_seq,
3830 RTM_GETMULTICAST,
3831 NLM_F_MULTI);
3832 if (err <= 0)
3833 break;
3834 }
3835 break;
3836 case ANYCAST_ADDR:
3837 /* anycast address */
3838 for (ifaca = idev->ac_list; ifaca;
3839 ifaca = ifaca->aca_next, ip_idx++) {
3840 if (ip_idx < s_ip_idx)
3841 continue;
3842 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 3843 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3844 cb->nlh->nlmsg_seq,
3845 RTM_GETANYCAST,
3846 NLM_F_MULTI);
3847 if (err <= 0)
3848 break;
3849 }
3850 break;
3851 default:
3852 break;
3853 }
3854 read_unlock_bh(&idev->lock);
3855 *p_ip_idx = ip_idx;
3856 return err;
3857}
3858
1da177e4
LT		 3859static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3860 enum addr_type_t type)
3861{
234b27c3
ED		 3862 struct net *net = sock_net(skb->sk);
3863 int h, s_h;
1da177e4
LT		 3864 int idx, ip_idx;
3865 int s_idx, s_ip_idx;
1da177e4 3866 struct net_device *dev;
234b27c3
ED		 3867 struct inet6_dev *idev;
3868 struct hlist_head *head;
3869 struct hlist_node *node;
1ab1457c 3870
234b27c3
ED		 3871 s_h = cb->args[0];
3872 s_idx = idx = cb->args[1];
3873 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 3874
234b27c3
ED		 3875 rcu_read_lock();
3876 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3877 idx = 0;
3878 head = &net->dev_index_head[h];
3879 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3880 if (idx < s_idx)
3881 goto cont;
4b97efdf 3882 if (h > s_h || idx > s_idx)
234b27c3
ED		 3883 s_ip_idx = 0;
3884 ip_idx = 0;
e21e8467
SH		 3885 idev = __in6_dev_get(dev);
3886 if (!idev)
234b27c3
ED		 3887 goto cont;
3888
3889 if (in6_dump_addrs(idev, skb, cb, type,
3890 s_ip_idx, &ip_idx) <= 0)
3891 goto done;
7562f876 3892cont:
234b27c3
ED		 3893 idx++;
3894 }
1da177e4 3895 }
234b27c3
ED		 3896done:
3897 rcu_read_unlock();
3898 cb->args[0] = h;
3899 cb->args[1] = idx;
3900 cb->args[2] = ip_idx;
3901
1da177e4
LT		 3902 return skb->len;
3903}
3904
3905static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3906{
3907 enum addr_type_t type = UNICAST_ADDR;
b854272b 3908
1da177e4
LT		 3909 return inet6_dump_addr(skb, cb, type);
3910}
3911
3912static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3913{
3914 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3915
1da177e4
LT		 3916 return inet6_dump_addr(skb, cb, type);
3917}
3918
3919
3920static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3921{
3922 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3923
1da177e4
LT		 3924 return inet6_dump_addr(skb, cb, type);
3925}
3926
8e5e8f30 3927static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
1b29fc2c 3928 void *arg)
6c223828 3929{
3b1e0a65 3930 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3931 struct ifaddrmsg *ifm;
3932 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3933 struct in6_addr *addr = NULL;
3934 struct net_device *dev = NULL;
3935 struct inet6_ifaddr *ifa;
3936 struct sk_buff *skb;
6c223828
NT		 3937 int err;
3938
1b29fc2c
TG		 3939 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3940 if (err < 0)
3941 goto errout;
3942
3943 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3944 if (addr == NULL) {
3945 err = -EINVAL;
3946 goto errout;
6c223828 3947 }
6c223828 3948
1b29fc2c 3949 ifm = nlmsg_data(nlh);
6c223828 3950 if (ifm->ifa_index)
6fda7350 3951 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3952
e21e8467
SH		 3953 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3954 if (!ifa) {
1b29fc2c
TG		 3955 err = -EADDRNOTAVAIL;
3956 goto errout;
3957 }
6c223828 3958
e21e8467
SH		 3959 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3960 if (!skb) {
6c223828 3961 err = -ENOBUFS;
1b29fc2c 3962 goto errout_ifa;
6c223828
NT		 3963 }
3964
15e47304 3965 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 3966 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3967 if (err < 0) {
3968 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3969 WARN_ON(err == -EMSGSIZE);
3970 kfree_skb(skb);
3971 goto errout_ifa;
3972 }
15e47304 3973 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 3974errout_ifa:
6c223828 3975 in6_ifa_put(ifa);
1b29fc2c 3976errout:
6c223828 3977 return err;
6c223828
NT		 3978}
3979
1da177e4
LT		 3980static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3981{
3982 struct sk_buff *skb;
c346dca1 3983 struct net *net = dev_net(ifa->idev->dev);
5d620266 3984 int err = -ENOBUFS;
1da177e4 3985
0ab6803b 3986 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3987 if (skb == NULL)
3988 goto errout;
3989
3990 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3991 if (err < 0) {
3992 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3993 WARN_ON(err == -EMSGSIZE);
3994 kfree_skb(skb);
3995 goto errout;
3996 }
1ce85fe4
PNA		 3997 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3998 return;
5d620266
TG		 3999errout:
4000 if (err < 0)
6fda7350 4001 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4002}
4003
b6f99a21 4004static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4005 __s32 *array, int bytes)
4006{
04561c1f
TG		 4007 BUG_ON(bytes < (DEVCONF_MAX * 4));
4008
1da177e4
LT		 4009 memset(array, 0, bytes);
4010 array[DEVCONF_FORWARDING] = cnf->forwarding;
4011 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4012 array[DEVCONF_MTU6] = cnf->mtu6;
4013 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4014 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4015 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4016 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4017 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4018 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4019 jiffies_to_msecs(cnf->rtr_solicit_interval);
4020 array[DEVCONF_RTR_SOLICIT_DELAY] =
4021 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4
LT		 4022 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4023#ifdef CONFIG_IPV6_PRIVACY
4024 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4025 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4026 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4027 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4028 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4029#endif
4030 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4031 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 4032 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4033#ifdef CONFIG_IPV6_ROUTER_PREF
4034 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4035 array[DEVCONF_RTR_PROBE_INTERVAL] =
4036 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4037#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4038 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4039#endif
930d6ff2 4040#endif
fbea49e1 4041 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4042 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4043#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4044 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4045#endif
7bc570c8
YH		 4046#ifdef CONFIG_IPV6_MROUTE
4047 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4048#endif
778d80be 4049 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4050 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4051 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4052 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
1da177e4
LT		 4053}
4054
b382b191
TG		 4055static inline size_t inet6_ifla6_size(void)
4056{
4057 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4058 + nla_total_size(sizeof(struct ifla_cacheinfo))
4059 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4060 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4061 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
4062}
4063
339bf98f
TG		 4064static inline size_t inet6_if_nlmsg_size(void)
4065{
4066 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4067 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4068 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4069 + nla_total_size(4) /* IFLA_MTU */
4070 + nla_total_size(4) /* IFLA_LINK */
b382b191 4071 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4072}
c5396a31 4073
be281e55 4074static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4075 int items, int bytes)
7f7d9a6b
HX		 4076{
4077 int i;
4078 int pad = bytes - sizeof(u64) * items;
4079 BUG_ON(pad < 0);
4080
4081 /* Use put_unaligned() because stats may not be aligned for u64. */
4082 put_unaligned(items, &stats[0]);
4083 for (i = 1; i < items; i++)
be281e55 4084 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4085
4086 memset(&stats[items], 0, pad);
4087}
4088
4ce3c183
ED		 4089static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4090 int items, int bytes, size_t syncpoff)
4091{
4092 int i;
4093 int pad = bytes - sizeof(u64) * items;
4094 BUG_ON(pad < 0);
4095
4096 /* Use put_unaligned() because stats may not be aligned for u64. */
4097 put_unaligned(items, &stats[0]);
4098 for (i = 1; i < items; i++)
4099 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4100
4101 memset(&stats[items], 0, pad);
4102}
4103
7f7d9a6b
HX		 4104static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4105 int bytes)
4106{
e21e8467 4107 switch (attrtype) {
7f7d9a6b 4108 case IFLA_INET6_STATS:
4ce3c183
ED		 4109 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4110 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4111 break;
4112 case IFLA_INET6_ICMP6STATS:
be281e55 4113 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4114 break;
4115 }
4116}
4117
b382b191
TG		 4118static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4119{
4120 struct nlattr *nla;
4121 struct ifla_cacheinfo ci;
4122
c78679e8
DM		 4123 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4124 goto nla_put_failure;
b382b191 4125 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4126 ci.tstamp = cstamp_delta(idev->tstamp);
4127 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4128 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
c78679e8
DM		 4129 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4130 goto nla_put_failure;
b382b191
TG		 4131 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4132 if (nla == NULL)
4133 goto nla_put_failure;
4134 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4135
4136 /* XXX - MC not implemented */
4137
4138 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4139 if (nla == NULL)
4140 goto nla_put_failure;
4141 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4142
4143 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4144 if (nla == NULL)
4145 goto nla_put_failure;
4146 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4147
4148 return 0;
4149
4150nla_put_failure:
4151 return -EMSGSIZE;
4152}
4153
4154static size_t inet6_get_link_af_size(const struct net_device *dev)
4155{
4156 if (!__in6_dev_get(dev))
4157 return 0;
4158
4159 return inet6_ifla6_size();
4160}
4161
4162static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4163{
4164 struct inet6_dev *idev = __in6_dev_get(dev);
4165
4166 if (!idev)
4167 return -ENODATA;
4168
4169 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4170 return -EMSGSIZE;
4171
4172 return 0;
4173}
4174
1ab1457c 4175static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4176 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4177{
04561c1f 4178 struct net_device *dev = idev->dev;
04561c1f
TG		 4179 struct ifinfomsg *hdr;
4180 struct nlmsghdr *nlh;
4181 void *protoinfo;
04561c1f 4182
15e47304 4183 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
04561c1f 4184 if (nlh == NULL)
26932566 4185 return -EMSGSIZE;
04561c1f
TG		 4186
4187 hdr = nlmsg_data(nlh);
4188 hdr->ifi_family = AF_INET6;
4189 hdr->__ifi_pad = 0;
4190 hdr->ifi_type = dev->type;
4191 hdr->ifi_index = dev->ifindex;
4192 hdr->ifi_flags = dev_get_flags(dev);
4193 hdr->ifi_change = 0;
4194
c78679e8
DM		 4195 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4196 (dev->addr_len &&
4197 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4198 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4199 (dev->ifindex != dev->iflink &&
4200 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4201 goto nla_put_failure;
04561c1f
TG		 4202 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4203 if (protoinfo == NULL)
4204 goto nla_put_failure;
1da177e4 4205
b382b191 4206 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4207 goto nla_put_failure;
1da177e4 4208
04561c1f
TG		 4209 nla_nest_end(skb, protoinfo);
4210 return nlmsg_end(skb, nlh);
1da177e4 4211
04561c1f 4212nla_put_failure:
26932566
PM		 4213 nlmsg_cancel(skb, nlh);
4214 return -EMSGSIZE;
1da177e4
LT		 4215}
4216
4217static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4218{
3b1e0a65 4219 struct net *net = sock_net(skb->sk);
84d2697d 4220 int h, s_h;
434a8a58 4221 int idx = 0, s_idx;
1da177e4
LT		 4222 struct net_device *dev;
4223 struct inet6_dev *idev;
84d2697d
ED		 4224 struct hlist_head *head;
4225 struct hlist_node *node;
1da177e4 4226
84d2697d
ED		 4227 s_h = cb->args[0];
4228 s_idx = cb->args[1];
4229
4230 rcu_read_lock();
4231 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4232 idx = 0;
4233 head = &net->dev_index_head[h];
4234 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4235 if (idx < s_idx)
4236 goto cont;
4237 idev = __in6_dev_get(dev);
4238 if (!idev)
4239 goto cont;
4240 if (inet6_fill_ifinfo(skb, idev,
15e47304 4241 NETLINK_CB(cb->skb).portid,
84d2697d
ED		 4242 cb->nlh->nlmsg_seq,
4243 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4244 goto out;
7562f876 4245cont:
84d2697d
ED		 4246 idx++;
4247 }
1da177e4 4248 }
84d2697d
ED		 4249out:
4250 rcu_read_unlock();
4251 cb->args[1] = idx;
4252 cb->args[0] = h;
1da177e4
LT		 4253
4254 return skb->len;
4255}
4256
4257void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4258{
4259 struct sk_buff *skb;
c346dca1 4260 struct net *net = dev_net(idev->dev);
8d7a76c9 4261 int err = -ENOBUFS;
1ab1457c 4262
339bf98f 4263 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4264 if (skb == NULL)
4265 goto errout;
4266
4267 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4268 if (err < 0) {
4269 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4270 WARN_ON(err == -EMSGSIZE);
4271 kfree_skb(skb);
4272 goto errout;
4273 }
5f75a104 4274 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4275 return;
8d7a76c9
TG		 4276errout:
4277 if (err < 0)
5f75a104 4278 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4279}
4280
339bf98f
TG		 4281static inline size_t inet6_prefix_nlmsg_size(void)
4282{
4283 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4284 + nla_total_size(sizeof(struct in6_addr))
4285 + nla_total_size(sizeof(struct prefix_cacheinfo));
4286}
c5396a31 4287
1da177e4 4288static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4289 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 4290 int event, unsigned int flags)
1da177e4 4291{
6051e2f4
TG		 4292 struct prefixmsg *pmsg;
4293 struct nlmsghdr *nlh;
1da177e4
LT		 4294 struct prefix_cacheinfo ci;
4295
15e47304 4296 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6051e2f4 4297 if (nlh == NULL)
26932566 4298 return -EMSGSIZE;
6051e2f4
TG		 4299
4300 pmsg = nlmsg_data(nlh);
1da177e4 4301 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4302 pmsg->prefix_pad1 = 0;
4303 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4304 pmsg->prefix_ifindex = idev->dev->ifindex;
4305 pmsg->prefix_len = pinfo->prefix_len;
4306 pmsg->prefix_type = pinfo->type;
8a47077a 4307 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4308 pmsg->prefix_flags = 0;
4309 if (pinfo->onlink)
4310 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4311 if (pinfo->autoconf)
4312 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4313
c78679e8
DM		 4314 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4315 goto nla_put_failure;
1da177e4
LT		 4316 ci.preferred_time = ntohl(pinfo->prefered);
4317 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 4318 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4319 goto nla_put_failure;
6051e2f4 4320 return nlmsg_end(skb, nlh);
1da177e4 4321
6051e2f4 4322nla_put_failure:
26932566
PM		 4323 nlmsg_cancel(skb, nlh);
4324 return -EMSGSIZE;
1da177e4
LT		 4325}
4326
1ab1457c 4327static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4328 struct prefix_info *pinfo)
4329{
4330 struct sk_buff *skb;
c346dca1 4331 struct net *net = dev_net(idev->dev);
8c384bfa 4332 int err = -ENOBUFS;
1da177e4 4333
339bf98f 4334 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4335 if (skb == NULL)
4336 goto errout;
4337
4338 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4339 if (err < 0) {
4340 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4341 WARN_ON(err == -EMSGSIZE);
4342 kfree_skb(skb);
4343 goto errout;
4344 }
1ce85fe4
PNA		 4345 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4346 return;
8c384bfa
TG		 4347errout:
4348 if (err < 0)
6fda7350 4349 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4350}
4351
1da177e4
LT		 4352static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4353{
4354 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4355
4356 switch (event) {
4357 case RTM_NEWADDR:
95c385b4
NH		 4358 /*
4359 * If the address was optimistic
4360 * we inserted the route at the start of
4361 * our DAD process, so we don't need
4362 * to do it again
4363 */
4364 if (!(ifp->rt->rt6i_node))
4365 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4366 if (ifp->idev->cnf.forwarding)
4367 addrconf_join_anycast(ifp);
4368 break;
4369 case RTM_DELADDR:
4370 if (ifp->idev->cnf.forwarding)
4371 addrconf_leave_anycast(ifp);
4372 addrconf_leave_solict(ifp->idev, &ifp->addr);
d8d1f30b 4373 dst_hold(&ifp->rt->dst);
93fa159a 4374
73a8bd74 4375 if (ip6_del_rt(ifp->rt))
d8d1f30b 4376 dst_free(&ifp->rt->dst);
1da177e4
LT		 4377 break;
4378 }
4379}
4380
4381static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4382{
8814c4b5 4383 rcu_read_lock_bh();
1da177e4
LT		 4384 if (likely(ifp->idev->dead == 0))
4385 __ipv6_ifa_notify(event, ifp);
8814c4b5 4386 rcu_read_unlock_bh();
1da177e4
LT		 4387}
4388
4389#ifdef CONFIG_SYSCTL
4390
4391static
8d65af78 4392int addrconf_sysctl_forward(ctl_table *ctl, int write,
1da177e4
LT		 4393 void __user *buffer, size_t *lenp, loff_t *ppos)
4394{
4395 int *valp = ctl->data;
4396 int val = *valp;
88af182e 4397 loff_t pos = *ppos;
013d97e9 4398 ctl_table lctl;
1da177e4
LT		 4399 int ret;
4400
013d97e9
FR		 4401 /*
4402 * ctl->data points to idev->cnf.forwarding, we should
4403 * not modify it until we get the rtnl lock.
4404 */
4405 lctl = *ctl;
4406 lctl.data = &val;
4407
4408 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 4409
c8fecf22 4410 if (write)
b325fddb 4411 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4412 if (ret)
4413 *ppos = pos;
1ab1457c 4414 return ret;
1da177e4
LT		 4415}
4416
56d417b1
BH		 4417static void dev_disable_change(struct inet6_dev *idev)
4418{
4419 if (!idev || !idev->dev)
4420 return;
4421
4422 if (idev->cnf.disable_ipv6)
4423 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4424 else
4425 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4426}
4427
4428static void addrconf_disable_change(struct net *net, __s32 newf)
4429{
4430 struct net_device *dev;
4431 struct inet6_dev *idev;
4432
c6d14c84
ED		 4433 rcu_read_lock();
4434 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4435 idev = __in6_dev_get(dev);
4436 if (idev) {
4437 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4438 idev->cnf.disable_ipv6 = newf;
4439 if (changed)
4440 dev_disable_change(idev);
4441 }
56d417b1 4442 }
c6d14c84 4443 rcu_read_unlock();
56d417b1
BH		 4444}
4445
013d97e9 4446static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 4447{
4448 struct net *net;
013d97e9
FR		 4449 int old;
4450
4451 if (!rtnl_trylock())
4452 return restart_syscall();
56d417b1
BH		 4453
4454 net = (struct net *)table->extra2;
013d97e9
FR		 4455 old = *p;
4456 *p = newf;
56d417b1 4457
013d97e9
FR		 4458 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4459 rtnl_unlock();
56d417b1 4460 return 0;
88af182e 4461 }
56d417b1
BH		 4462
4463 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 4464 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4465 addrconf_disable_change(net, newf);
013d97e9 4466 } else if ((!newf) ^ (!old))
56d417b1
BH		 4467 dev_disable_change((struct inet6_dev *)table->extra1);
4468
4469 rtnl_unlock();
4470 return 0;
4471}
4472
4473static
8d65af78 4474int addrconf_sysctl_disable(ctl_table *ctl, int write,
56d417b1
BH		 4475 void __user *buffer, size_t *lenp, loff_t *ppos)
4476{
4477 int *valp = ctl->data;
4478 int val = *valp;
88af182e 4479 loff_t pos = *ppos;
013d97e9 4480 ctl_table lctl;
56d417b1
BH		 4481 int ret;
4482
013d97e9
FR		 4483 /*
4484 * ctl->data points to idev->cnf.disable_ipv6, we should
4485 * not modify it until we get the rtnl lock.
4486 */
4487 lctl = *ctl;
4488 lctl.data = &val;
4489
4490 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 4491
4492 if (write)
4493 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4494 if (ret)
4495 *ppos = pos;
56d417b1
BH		 4496 return ret;
4497}
4498
1da177e4
LT		 4499static struct addrconf_sysctl_table
4500{
4501 struct ctl_table_header *sysctl_header;
f6a07b29 4502 ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 4503} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4504 .sysctl_header = NULL,
4505 .addrconf_vars = {
1ab1457c 4506 {
e21e8467
SH		 4507 .procname = "forwarding",
4508 .data = &ipv6_devconf.forwarding,
4509 .maxlen = sizeof(int),
4510 .mode = 0644,
4511 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4512 },
4513 {
e21e8467
SH		 4514 .procname = "hop_limit",
4515 .data = &ipv6_devconf.hop_limit,
4516 .maxlen = sizeof(int),
4517 .mode = 0644,
4518 .proc_handler = proc_dointvec,
1da177e4
LT		 4519 },
4520 {
e21e8467
SH		 4521 .procname = "mtu",
4522 .data = &ipv6_devconf.mtu6,
4523 .maxlen = sizeof(int),
4524 .mode = 0644,
4525 .proc_handler = proc_dointvec,
1da177e4
LT		 4526 },
4527 {
e21e8467
SH		 4528 .procname = "accept_ra",
4529 .data = &ipv6_devconf.accept_ra,
4530 .maxlen = sizeof(int),
4531 .mode = 0644,
4532 .proc_handler = proc_dointvec,
1da177e4
LT		 4533 },
4534 {
e21e8467
SH		 4535 .procname = "accept_redirects",
4536 .data = &ipv6_devconf.accept_redirects,
4537 .maxlen = sizeof(int),
4538 .mode = 0644,
4539 .proc_handler = proc_dointvec,
1da177e4
LT		 4540 },
4541 {
e21e8467
SH		 4542 .procname = "autoconf",
4543 .data = &ipv6_devconf.autoconf,
4544 .maxlen = sizeof(int),
4545 .mode = 0644,
4546 .proc_handler = proc_dointvec,
1da177e4
LT		 4547 },
4548 {
e21e8467
SH		 4549 .procname = "dad_transmits",
4550 .data = &ipv6_devconf.dad_transmits,
4551 .maxlen = sizeof(int),
4552 .mode = 0644,
4553 .proc_handler = proc_dointvec,
1da177e4
LT		 4554 },
4555 {
e21e8467
SH		 4556 .procname = "router_solicitations",
4557 .data = &ipv6_devconf.rtr_solicits,
4558 .maxlen = sizeof(int),
4559 .mode = 0644,
4560 .proc_handler = proc_dointvec,
1da177e4
LT		 4561 },
4562 {
e21e8467
SH		 4563 .procname = "router_solicitation_interval",
4564 .data = &ipv6_devconf.rtr_solicit_interval,
4565 .maxlen = sizeof(int),
4566 .mode = 0644,
4567 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4568 },
4569 {
e21e8467
SH		 4570 .procname = "router_solicitation_delay",
4571 .data = &ipv6_devconf.rtr_solicit_delay,
4572 .maxlen = sizeof(int),
4573 .mode = 0644,
4574 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4575 },
4576 {
e21e8467
SH		 4577 .procname = "force_mld_version",
4578 .data = &ipv6_devconf.force_mld_version,
4579 .maxlen = sizeof(int),
4580 .mode = 0644,
4581 .proc_handler = proc_dointvec,
1da177e4
LT		 4582 },
4583#ifdef CONFIG_IPV6_PRIVACY
4584 {
e21e8467
SH		 4585 .procname = "use_tempaddr",
4586 .data = &ipv6_devconf.use_tempaddr,
4587 .maxlen = sizeof(int),
4588 .mode = 0644,
4589 .proc_handler = proc_dointvec,
1da177e4
LT		 4590 },
4591 {
e21e8467
SH		 4592 .procname = "temp_valid_lft",
4593 .data = &ipv6_devconf.temp_valid_lft,
4594 .maxlen = sizeof(int),
4595 .mode = 0644,
4596 .proc_handler = proc_dointvec,
1da177e4
LT		 4597 },
4598 {
e21e8467
SH		 4599 .procname = "temp_prefered_lft",
4600 .data = &ipv6_devconf.temp_prefered_lft,
4601 .maxlen = sizeof(int),
4602 .mode = 0644,
4603 .proc_handler = proc_dointvec,
1da177e4
LT		 4604 },
4605 {
e21e8467
SH		 4606 .procname = "regen_max_retry",
4607 .data = &ipv6_devconf.regen_max_retry,
4608 .maxlen = sizeof(int),
4609 .mode = 0644,
4610 .proc_handler = proc_dointvec,
1da177e4
LT		 4611 },
4612 {
e21e8467
SH		 4613 .procname = "max_desync_factor",
4614 .data = &ipv6_devconf.max_desync_factor,
4615 .maxlen = sizeof(int),
4616 .mode = 0644,
4617 .proc_handler = proc_dointvec,
1da177e4
LT		 4618 },
4619#endif
4620 {
e21e8467
SH		 4621 .procname = "max_addresses",
4622 .data = &ipv6_devconf.max_addresses,
4623 .maxlen = sizeof(int),
4624 .mode = 0644,
4625 .proc_handler = proc_dointvec,
1da177e4 4626 },
65f5c7c1 4627 {
e21e8467
SH		 4628 .procname = "accept_ra_defrtr",
4629 .data = &ipv6_devconf.accept_ra_defrtr,
4630 .maxlen = sizeof(int),
4631 .mode = 0644,
4632 .proc_handler = proc_dointvec,
65f5c7c1 4633 },
c4fd30eb 4634 {
e21e8467
SH		 4635 .procname = "accept_ra_pinfo",
4636 .data = &ipv6_devconf.accept_ra_pinfo,
4637 .maxlen = sizeof(int),
4638 .mode = 0644,
4639 .proc_handler = proc_dointvec,
c4fd30eb 4640 },
930d6ff2
YH		 4641#ifdef CONFIG_IPV6_ROUTER_PREF
4642 {
e21e8467
SH		 4643 .procname = "accept_ra_rtr_pref",
4644 .data = &ipv6_devconf.accept_ra_rtr_pref,
4645 .maxlen = sizeof(int),
4646 .mode = 0644,
4647 .proc_handler = proc_dointvec,
930d6ff2 4648 },
52e16356 4649 {
e21e8467
SH		 4650 .procname = "router_probe_interval",
4651 .data = &ipv6_devconf.rtr_probe_interval,
4652 .maxlen = sizeof(int),
4653 .mode = 0644,
4654 .proc_handler = proc_dointvec_jiffies,
52e16356 4655 },
fa03ef38 4656#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4657 {
e21e8467
SH		 4658 .procname = "accept_ra_rt_info_max_plen",
4659 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4660 .maxlen = sizeof(int),
4661 .mode = 0644,
4662 .proc_handler = proc_dointvec,
09c884d4
YH		 4663 },
4664#endif
930d6ff2 4665#endif
fbea49e1 4666 {
e21e8467
SH		 4667 .procname = "proxy_ndp",
4668 .data = &ipv6_devconf.proxy_ndp,
4669 .maxlen = sizeof(int),
4670 .mode = 0644,
4671 .proc_handler = proc_dointvec,
fbea49e1 4672 },
0bcbc926 4673 {
e21e8467
SH		 4674 .procname = "accept_source_route",
4675 .data = &ipv6_devconf.accept_source_route,
4676 .maxlen = sizeof(int),
4677 .mode = 0644,
4678 .proc_handler = proc_dointvec,
0bcbc926 4679 },
95c385b4
NH		 4680#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4681 {
e21e8467
SH		 4682 .procname = "optimistic_dad",
4683 .data = &ipv6_devconf.optimistic_dad,
4684 .maxlen = sizeof(int),
4685 .mode = 0644,
4686 .proc_handler = proc_dointvec,
95c385b4
NH		 4687
4688 },
7bc570c8
YH		 4689#endif
4690#ifdef CONFIG_IPV6_MROUTE
4691 {
e21e8467
SH		 4692 .procname = "mc_forwarding",
4693 .data = &ipv6_devconf.mc_forwarding,
4694 .maxlen = sizeof(int),
4695 .mode = 0444,
4696 .proc_handler = proc_dointvec,
7bc570c8 4697 },
95c385b4 4698#endif
778d80be 4699 {
e21e8467
SH		 4700 .procname = "disable_ipv6",
4701 .data = &ipv6_devconf.disable_ipv6,
4702 .maxlen = sizeof(int),
4703 .mode = 0644,
4704 .proc_handler = addrconf_sysctl_disable,
778d80be 4705 },
1b34be74 4706 {
e21e8467
SH		 4707 .procname = "accept_dad",
4708 .data = &ipv6_devconf.accept_dad,
4709 .maxlen = sizeof(int),
4710 .mode = 0644,
4711 .proc_handler = proc_dointvec,
1b34be74 4712 },
f7734fdf 4713 {
f7734fdf
OP		 4714 .procname = "force_tllao",
4715 .data = &ipv6_devconf.force_tllao,
4716 .maxlen = sizeof(int),
4717 .mode = 0644,
4718 .proc_handler = proc_dointvec
4719 },
5cb04436
HFS		 4720 {
4721 .procname = "ndisc_notify",
4722 .data = &ipv6_devconf.ndisc_notify,
4723 .maxlen = sizeof(int),
4724 .mode = 0644,
4725 .proc_handler = proc_dointvec
4726 },
1da177e4 4727 {
f8572d8f 4728 /* sentinel */
1da177e4
LT		 4729 }
4730 },
1da177e4
LT		 4731};
4732
bff16c2f 4733static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4734 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4735{
4736 int i;
1da177e4 4737 struct addrconf_sysctl_table *t;
6105e293 4738 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 4739
af879cc7 4740 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4741 if (t == NULL)
f68635e6
PE		 4742 goto out;
4743
bcdd553f 4744 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 4745 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 4746 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4747 t->addrconf_vars[i].extra2 = net;
1da177e4 4748 }
1da177e4 4749
6105e293 4750 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 4751
6105e293 4752 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
1da177e4 4753 if (t->sysctl_header == NULL)
6105e293 4754 goto free;
f68635e6
PE		 4755
4756 p->sysctl = t;
95897312 4757 return 0;
1da177e4 4758
f68635e6 4759free:
1da177e4 4760 kfree(t);
f68635e6 4761out:
95897312 4762 return -ENOBUFS;
1da177e4
LT		 4763}
4764
408c4768
PE		 4765static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4766{
4767 struct addrconf_sysctl_table *t;
4768
4769 if (p->sysctl == NULL)
4770 return;
4771
4772 t = p->sysctl;
4773 p->sysctl = NULL;
ff538818 4774 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 4775 kfree(t);
4776}
4777
f52295a9
PE		 4778static void addrconf_sysctl_register(struct inet6_dev *idev)
4779{
54716e3b 4780 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 4781 &ndisc_ifinfo_sysctl_change);
c346dca1 4782 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 4783 idev, &idev->cnf);
f52295a9
PE		 4784}
4785
408c4768 4786static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4787{
408c4768
PE		 4788 __addrconf_sysctl_unregister(&idev->cnf);
4789 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4790}
4791
4792
4793#endif
4794
2c8c1e72 4795static int __net_init addrconf_init_net(struct net *net)
e0da5a48
PE		 4796{
4797 int err;
4798 struct ipv6_devconf *all, *dflt;
4799
4800 err = -ENOMEM;
4801 all = &ipv6_devconf;
4802 dflt = &ipv6_devconf_dflt;
4803
09ad9bc7 4804 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4805 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4806 if (all == NULL)
4807 goto err_alloc_all;
4808
4809 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4810 if (dflt == NULL)
4811 goto err_alloc_dflt;
56d417b1
BH		 4812 } else {
4813 /* these will be inherited by all namespaces */
4814 dflt->autoconf = ipv6_defaults.autoconf;
4815 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 4816 }
4817
4818 net->ipv6.devconf_all = all;
4819 net->ipv6.devconf_dflt = dflt;
4820
4821#ifdef CONFIG_SYSCTL
f8572d8f 4822 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 4823 if (err < 0)
4824 goto err_reg_all;
4825
f8572d8f 4826 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 4827 if (err < 0)
4828 goto err_reg_dflt;
4829#endif
4830 return 0;
4831
4832#ifdef CONFIG_SYSCTL
4833err_reg_dflt:
4834 __addrconf_sysctl_unregister(all);
4835err_reg_all:
4836 kfree(dflt);
4837#endif
4838err_alloc_dflt:
4839 kfree(all);
4840err_alloc_all:
4841 return err;
4842}
4843
2c8c1e72 4844static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 4845{
4846#ifdef CONFIG_SYSCTL
4847 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4848 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4849#endif
09ad9bc7 4850 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4851 kfree(net->ipv6.devconf_dflt);
4852 kfree(net->ipv6.devconf_all);
4853 }
4854}
4855
4856static struct pernet_operations addrconf_ops = {
4857 .init = addrconf_init_net,
4858 .exit = addrconf_exit_net,
4859};
4860
1da177e4
LT		 4861/*
4862 * Device notifier
4863 */
4864
4865int register_inet6addr_notifier(struct notifier_block *nb)
4866{
1ab1457c 4867 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4 4868}
7159039a
YH		 4869EXPORT_SYMBOL(register_inet6addr_notifier);
4870
1da177e4
LT		 4871int unregister_inet6addr_notifier(struct notifier_block *nb)
4872{
e21e8467 4873 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
1da177e4 4874}
7159039a
YH		 4875EXPORT_SYMBOL(unregister_inet6addr_notifier);
4876
b382b191
TG		 4877static struct rtnl_af_ops inet6_ops = {
4878 .family = AF_INET6,
4879 .fill_link_af = inet6_fill_link_af,
4880 .get_link_af_size = inet6_get_link_af_size,
b382b191
TG		 4881};
4882
1da177e4
LT		 4883/*
4884 * Init / cleanup code
4885 */
4886
4887int __init addrconf_init(void)
4888{
c2e21293 4889 int i, err;
2a8cc6c8 4890
e21e8467
SH		 4891 err = ipv6_addr_label_init();
4892 if (err < 0) {
f3213831
JP		 4893 pr_crit("%s: cannot initialize default policy table: %d\n",
4894 __func__, err);
2cc6d2bf 4895 goto out;
2a8cc6c8 4896 }
1da177e4 4897
2cc6d2bf
NH		 4898 err = register_pernet_subsys(&addrconf_ops);
4899 if (err < 0)
4900 goto out_addrlabel;
e0da5a48 4901
1da177e4
LT		 4902 /* The addrconf netdev notifier requires that loopback_dev
4903 * has it's ipv6 private information allocated and setup
4904 * before it can bring up and give link-local addresses
4905 * to other devices which are up.
4906 *
4907 * Unfortunately, loopback_dev is not necessarily the first
4908 * entry in the global dev_base list of net devices. In fact,
4909 * it is likely to be the very last entry on that list.
4910 * So this causes the notifier registry below to try and
4911 * give link-local addresses to all devices besides loopback_dev
4912 * first, then loopback_dev, which cases all the non-loopback_dev
4913 * devices to fail to get a link-local address.
4914 *
4915 * So, as a temporary fix, allocate the ipv6 structure for
4916 * loopback_dev first by hand.
4917 * Longer term, all of the dependencies ipv6 has upon the loopback
4918 * device and it being up should be removed.
4919 */
4920 rtnl_lock();
2774c7ab 4921 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4922 err = -ENOMEM;
4923 rtnl_unlock();
4924 if (err)
e0da5a48 4925 goto errlo;
1da177e4 4926
c2e21293 4927 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4928 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4929
1da177e4
LT		 4930 register_netdevice_notifier(&ipv6_dev_notf);
4931
1da177e4 4932 addrconf_verify(0);
c127ea2c 4933
b382b191
TG		 4934 err = rtnl_af_register(&inet6_ops);
4935 if (err < 0)
4936 goto errout_af;
4937
c7ac8679
GR		 4938 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4939 NULL);
c127ea2c
TG		 4940 if (err < 0)
4941 goto errout;
4942
4943 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 4944 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4945 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4946 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4947 inet6_dump_ifaddr, NULL);
4948 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4949 inet6_dump_ifmcaddr, NULL);
4950 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4951 inet6_dump_ifacaddr, NULL);
76f8f6cb
ND		 4952 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
4953 NULL, NULL);
c127ea2c 4954
2a8cc6c8
YH		 4955 ipv6_addr_label_rtnl_register();
4956
1da177e4 4957 return 0;
c127ea2c 4958errout:
b382b191
TG		 4959 rtnl_af_unregister(&inet6_ops);
4960errout_af:
c127ea2c 4961 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4962errlo:
4963 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 4964out_addrlabel:
4965 ipv6_addr_label_cleanup();
4966out:
c127ea2c 4967 return err;
1da177e4
LT		 4968}
4969
09f7709f 4970void addrconf_cleanup(void)
1da177e4 4971{
176c39af 4972 struct net_device *dev;
1da177e4
LT		 4973 int i;
4974
4975 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 4976 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 4977 ipv6_addr_label_cleanup();
1da177e4
LT		 4978
4979 rtnl_lock();
4980
b382b191
TG		 4981 __rtnl_af_unregister(&inet6_ops);
4982
176c39af
DL		 4983 /* clean dev list */
4984 for_each_netdev(&init_net, dev) {
4985 if (__in6_dev_get(dev) == NULL)
4986 continue;
4987 addrconf_ifdown(dev, 1);
4988 }
4989 addrconf_ifdown(init_net.loopback_dev, 2);
4990
1da177e4
LT		 4991 /*
4992 * Check hash table.
4993 */
5c578aed 4994 spin_lock_bh(&addrconf_hash_lock);
c2e21293 4995 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4996 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 4997 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 4998
4999 del_timer(&addr_chk_timer);
1da177e4 5000 rtnl_unlock();
1da177e4 5001}
kernel source for telekom puls (alcatel/mediatek)