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net: ipv6: add tokenized interface identifier support
[deliverable/linux.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
1da177e4
LT		 46#include <linux/socket.h>
47#include <linux/sockios.h>
1da177e4
LT		 48#include <linux/net.h>
49#include <linux/in6.h>
50#include <linux/netdevice.h>
1823730f 51#include <linux/if_addr.h>
1da177e4
LT		 52#include <linux/if_arp.h>
53#include <linux/if_arcnet.h>
54#include <linux/if_infiniband.h>
55#include <linux/route.h>
56#include <linux/inetdevice.h>
57#include <linux/init.h>
5a0e3ad6 58#include <linux/slab.h>
1da177e4
LT		 59#ifdef CONFIG_SYSCTL
60#include <linux/sysctl.h>
61#endif
4fc268d2 62#include <linux/capability.h>
1da177e4
LT		 63#include <linux/delay.h>
64#include <linux/notifier.h>
543537bd 65#include <linux/string.h>
ddbe5032 66#include <linux/hash.h>
1da177e4 67
457c4cbc 68#include <net/net_namespace.h>
1da177e4
LT		 69#include <net/sock.h>
70#include <net/snmp.h>
71
06a4c1c5 72#include <net/af_ieee802154.h>
cb6bf355 73#include <net/firewire.h>
1da177e4
LT		 74#include <net/ipv6.h>
75#include <net/protocol.h>
76#include <net/ndisc.h>
77#include <net/ip6_route.h>
78#include <net/addrconf.h>
79#include <net/tcp.h>
80#include <net/ip.h>
5d620266 81#include <net/netlink.h>
f24e3d65 82#include <net/pkt_sched.h>
1da177e4
LT		 83#include <linux/if_tunnel.h>
84#include <linux/rtnetlink.h>
f3a1bfb1 85#include <linux/netconf.h>
1da177e4
LT		 86
87#ifdef CONFIG_IPV6_PRIVACY
88#include <linux/random.h>
1da177e4
LT		 89#endif
90
e21e8467 91#include <linux/uaccess.h>
7f7d9a6b 92#include <asm/unaligned.h>
1da177e4
LT		 93
94#include <linux/proc_fs.h>
95#include <linux/seq_file.h>
bc3b2d7f 96#include <linux/export.h>
1da177e4
LT		 97
98/* Set to 3 to get tracing... */
99#define ACONF_DEBUG 2
100
101#if ACONF_DEBUG >= 3
102#define ADBG(x) printk x
103#else
104#define ADBG(x)
105#endif
106
107#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e
TG		 108
109static inline u32 cstamp_delta(unsigned long cstamp)
110{
111 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
112}
1da177e4
LT		 113
114#ifdef CONFIG_SYSCTL
f52295a9 115static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 116static void addrconf_sysctl_unregister(struct inet6_dev *idev);
117#else
118static inline void addrconf_sysctl_register(struct inet6_dev *idev)
119{
120}
121
122static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
123{
124}
1da177e4
LT		 125#endif
126
127#ifdef CONFIG_IPV6_PRIVACY
eb7e0575
SD		 128static void __ipv6_regen_rndid(struct inet6_dev *idev);
129static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 130static void ipv6_regen_rndid(unsigned long data);
1da177e4
LT		 131#endif
132
1b34be74 133static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 134static int ipv6_count_addresses(struct inet6_dev *idev);
135
136/*
137 * Configured unicast address hash table
138 */
c2e21293 139static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 140static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 141
1da177e4
LT		 142static void addrconf_verify(unsigned long);
143
8d06afab 144static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 145static DEFINE_SPINLOCK(addrconf_verify_lock);
146
147static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
148static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
149
93d9b7d7
JP		 150static void addrconf_type_change(struct net_device *dev,
151 unsigned long event);
1da177e4
LT		 152static int addrconf_ifdown(struct net_device *dev, int how);
153
21caa662
RK		 154static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
155 int plen,
156 const struct net_device *dev,
157 u32 flags, u32 noflags);
158
cf22f9a2 159static void addrconf_dad_start(struct inet6_ifaddr *ifp);
1da177e4
LT		 160static void addrconf_dad_timer(unsigned long data);
161static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 162static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 163static void addrconf_rs_timer(unsigned long data);
164static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
165static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
166
1ab1457c 167static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 168 struct prefix_info *pinfo);
3e81c6da
DM		 169static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
170 struct net_device *dev);
1da177e4 171
e041c683 172static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 173
888c848e 174static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 175 .forwarding = 0,
176 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
177 .mtu6 = IPV6_MIN_MTU,
178 .accept_ra = 1,
179 .accept_redirects = 1,
180 .autoconf = 1,
181 .force_mld_version = 0,
182 .dad_transmits = 1,
183 .rtr_solicits = MAX_RTR_SOLICITATIONS,
184 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
185 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
186#ifdef CONFIG_IPV6_PRIVACY
187 .use_tempaddr = 0,
188 .temp_valid_lft = TEMP_VALID_LIFETIME,
189 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
190 .regen_max_retry = REGEN_MAX_RETRY,
191 .max_desync_factor = MAX_DESYNC_FACTOR,
192#endif
193 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 194 .accept_ra_defrtr = 1,
c4fd30eb 195 .accept_ra_pinfo = 1,
930d6ff2
YH		 196#ifdef CONFIG_IPV6_ROUTER_PREF
197 .accept_ra_rtr_pref = 1,
52e16356 198 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 199#ifdef CONFIG_IPV6_ROUTE_INFO
200 .accept_ra_rt_info_max_plen = 0,
201#endif
930d6ff2 202#endif
fbea49e1 203 .proxy_ndp = 0,
0bcbc926 204 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 205 .disable_ipv6 = 0,
1b34be74 206 .accept_dad = 1,
1da177e4
LT		 207};
208
ab32ea5d 209static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 210 .forwarding = 0,
211 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
212 .mtu6 = IPV6_MIN_MTU,
213 .accept_ra = 1,
214 .accept_redirects = 1,
215 .autoconf = 1,
216 .dad_transmits = 1,
217 .rtr_solicits = MAX_RTR_SOLICITATIONS,
218 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
219 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
220#ifdef CONFIG_IPV6_PRIVACY
221 .use_tempaddr = 0,
222 .temp_valid_lft = TEMP_VALID_LIFETIME,
223 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
224 .regen_max_retry = REGEN_MAX_RETRY,
225 .max_desync_factor = MAX_DESYNC_FACTOR,
226#endif
227 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 228 .accept_ra_defrtr = 1,
c4fd30eb 229 .accept_ra_pinfo = 1,
930d6ff2
YH		 230#ifdef CONFIG_IPV6_ROUTER_PREF
231 .accept_ra_rtr_pref = 1,
52e16356 232 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 233#ifdef CONFIG_IPV6_ROUTE_INFO
234 .accept_ra_rt_info_max_plen = 0,
235#endif
930d6ff2 236#endif
fbea49e1 237 .proxy_ndp = 0,
0bcbc926 238 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 239 .disable_ipv6 = 0,
1b34be74 240 .accept_dad = 1,
1da177e4
LT		 241};
242
243/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 244const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4 245const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
f3ee4010
YH		 246const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
247const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
2c5e8933
HFS		 248const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
249const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
250const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
1da177e4 251
f24e3d65 252/* Check if a valid qdisc is available */
05297949 253static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 254{
05297949 255 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 256}
257
1da177e4
LT		 258static void addrconf_del_timer(struct inet6_ifaddr *ifp)
259{
260 if (del_timer(&ifp->timer))
261 __in6_ifa_put(ifp);
262}
263
e21e8467 264enum addrconf_timer_t {
1da177e4
LT		 265 AC_NONE,
266 AC_DAD,
267 AC_RS,
268};
269
270static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
271 enum addrconf_timer_t what,
272 unsigned long when)
273{
274 if (!del_timer(&ifp->timer))
275 in6_ifa_hold(ifp);
276
277 switch (what) {
278 case AC_DAD:
279 ifp->timer.function = addrconf_dad_timer;
280 break;
281 case AC_RS:
282 ifp->timer.function = addrconf_rs_timer;
283 break;
e21e8467
SH		 284 default:
285 break;
1da177e4
LT		 286 }
287 ifp->timer.expires = jiffies + when;
288 add_timer(&ifp->timer);
289}
290
7f7d9a6b
HX		 291static int snmp6_alloc_dev(struct inet6_dev *idev)
292{
7d720c3e 293 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
1823e4c8
ED		 294 sizeof(struct ipstats_mib),
295 __alignof__(struct ipstats_mib)) < 0)
7f7d9a6b 296 goto err_ip;
be281e55
ED		 297 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
298 GFP_KERNEL);
299 if (!idev->stats.icmpv6dev)
7f7d9a6b 300 goto err_icmp;
be281e55
ED		 301 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
302 GFP_KERNEL);
303 if (!idev->stats.icmpv6msgdev)
14878f75 304 goto err_icmpmsg;
7f7d9a6b
HX		 305
306 return 0;
307
14878f75 308err_icmpmsg:
be281e55 309 kfree(idev->stats.icmpv6dev);
7f7d9a6b 310err_icmp:
7d720c3e 311 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b 312err_ip:
aaf70ec7 313 return -ENOMEM;
7f7d9a6b
HX		 314}
315
16910b98 316static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 317{
be281e55
ED		 318 kfree(idev->stats.icmpv6msgdev);
319 kfree(idev->stats.icmpv6dev);
7d720c3e 320 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b
HX		 321}
322
1da177e4
LT		 323/* Nobody refers to this device, we may destroy it. */
324
325void in6_dev_finish_destroy(struct inet6_dev *idev)
326{
327 struct net_device *dev = idev->dev;
547b792c 328
502a2ffd 329 WARN_ON(!list_empty(&idev->addr_list));
547b792c
IJ		 330 WARN_ON(idev->mc_list != NULL);
331
1da177e4 332#ifdef NET_REFCNT_DEBUG
91df42be 333 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
1da177e4
LT		 334#endif
335 dev_put(dev);
336 if (!idev->dead) {
f3213831 337 pr_warn("Freeing alive inet6 device %p\n", idev);
1da177e4
LT		 338 return;
339 }
340 snmp6_free_dev(idev);
38f57d1a 341 kfree_rcu(idev, rcu);
1da177e4 342}
7159039a
YH		 343EXPORT_SYMBOL(in6_dev_finish_destroy);
344
8e5e8f30 345static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 346{
347 struct inet6_dev *ndev;
348
349 ASSERT_RTNL();
350
351 if (dev->mtu < IPV6_MIN_MTU)
352 return NULL;
353
1ab1457c 354 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 355
1ab1457c
YH		 356 if (ndev == NULL)
357 return NULL;
322f74a4
IO		 358
359 rwlock_init(&ndev->lock);
360 ndev->dev = dev;
502a2ffd 361 INIT_LIST_HEAD(&ndev->addr_list);
362
c346dca1 363 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 364 ndev->cnf.mtu6 = dev->mtu;
365 ndev->cnf.sysctl = NULL;
366 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
367 if (ndev->nd_parms == NULL) {
368 kfree(ndev);
369 return NULL;
370 }
0187bdfb
BH		 371 if (ndev->cnf.forwarding)
372 dev_disable_lro(dev);
322f74a4
IO		 373 /* We refer to the device */
374 dev_hold(dev);
1da177e4 375
322f74a4
IO		 376 if (snmp6_alloc_dev(ndev) < 0) {
377 ADBG((KERN_WARNING
f3213831 378 "%s: cannot allocate memory for statistics; dev=%s.\n",
0dc47877 379 __func__, dev->name));
322f74a4 380 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 381 dev_put(dev);
382 kfree(ndev);
322f74a4
IO		 383 return NULL;
384 }
1da177e4 385
322f74a4
IO		 386 if (snmp6_register_dev(ndev) < 0) {
387 ADBG((KERN_WARNING
f3213831 388 "%s: cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 389 __func__, dev->name));
322f74a4
IO		 390 neigh_parms_release(&nd_tbl, ndev->nd_parms);
391 ndev->dead = 1;
392 in6_dev_finish_destroy(ndev);
393 return NULL;
394 }
395
396 /* One reference from device. We must do this before
397 * we invoke __ipv6_regen_rndid().
398 */
399 in6_dev_hold(ndev);
1da177e4 400
1b34be74
YH		 401 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
402 ndev->cnf.accept_dad = -1;
403
07a93626 404#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 405 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 406 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 407 ndev->cnf.rtr_solicits = 0;
408 }
409#endif
410
1da177e4 411#ifdef CONFIG_IPV6_PRIVACY
372e6c8f 412 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 413 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 414 if ((dev->flags&IFF_LOOPBACK) ||
415 dev->type == ARPHRD_TUNNEL ||
9625ed72 416 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 417 dev->type == ARPHRD_SIT ||
0be669bb 418 dev->type == ARPHRD_NONE) {
322f74a4
IO		 419 ndev->cnf.use_tempaddr = -1;
420 } else {
421 in6_dev_hold(ndev);
422 ipv6_regen_rndid((unsigned long) ndev);
423 }
1da177e4 424#endif
f53adae4 425 memset(ndev->token.s6_addr, 0, sizeof(ndev->token.s6_addr));
1da177e4 426
f24e3d65 427 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 428 ndev->if_flags |= IF_READY;
429
322f74a4
IO		 430 ipv6_mc_init_dev(ndev);
431 ndev->tstamp = jiffies;
f52295a9 432 addrconf_sysctl_register(ndev);
30c4cf57 433 /* protected by rtnl_lock */
cf778b00 434 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 435
2c5e8933
HFS		 436 /* Join interface-local all-node multicast group */
437 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
438
d88ae4cc 439 /* Join all-node multicast group */
f3ee4010 440 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 441
d6ddef9e 442 /* Join all-router multicast group if forwarding is set */
8b2aaede 443 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 444 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
445
1da177e4
LT		 446 return ndev;
447}
448
8e5e8f30 449static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 450{
451 struct inet6_dev *idev;
452
453 ASSERT_RTNL();
454
e21e8467
SH		 455 idev = __in6_dev_get(dev);
456 if (!idev) {
457 idev = ipv6_add_dev(dev);
458 if (!idev)
1da177e4
LT		 459 return NULL;
460 }
c5e33bdd 461
1da177e4
LT		 462 if (dev->flags&IFF_UP)
463 ipv6_mc_up(idev);
464 return idev;
465}
466
f3a1bfb1
ND		 467static int inet6_netconf_msgsize_devconf(int type)
468{
469 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
470 + nla_total_size(4); /* NETCONFA_IFINDEX */
471
76f8f6cb
ND		 472 /* type -1 is used for ALL */
473 if (type == -1 || type == NETCONFA_FORWARDING)
f3a1bfb1 474 size += nla_total_size(4);
b1afce95 475#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 476 if (type == -1 || type == NETCONFA_MC_FORWARDING)
477 size += nla_total_size(4);
b1afce95 478#endif
f3a1bfb1
ND		 479
480 return size;
481}
482
483static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
484 struct ipv6_devconf *devconf, u32 portid,
485 u32 seq, int event, unsigned int flags,
486 int type)
487{
488 struct nlmsghdr *nlh;
489 struct netconfmsg *ncm;
490
491 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
492 flags);
493 if (nlh == NULL)
494 return -EMSGSIZE;
495
496 ncm = nlmsg_data(nlh);
497 ncm->ncm_family = AF_INET6;
498
499 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
500 goto nla_put_failure;
501
76f8f6cb
ND		 502 /* type -1 is used for ALL */
503 if ((type == -1 || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 504 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
505 goto nla_put_failure;
b1afce95 506#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 507 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
508 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
509 devconf->mc_forwarding) < 0)
510 goto nla_put_failure;
b1afce95 511#endif
f3a1bfb1
ND		 512 return nlmsg_end(skb, nlh);
513
514nla_put_failure:
515 nlmsg_cancel(skb, nlh);
516 return -EMSGSIZE;
517}
518
d67b8c61
ND		 519void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
520 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 521{
522 struct sk_buff *skb;
523 int err = -ENOBUFS;
524
525 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
526 if (skb == NULL)
527 goto errout;
528
529 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
530 RTM_NEWNETCONF, 0, type);
531 if (err < 0) {
532 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
533 WARN_ON(err == -EMSGSIZE);
534 kfree_skb(skb);
535 goto errout;
536 }
537 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
538 return;
539errout:
bd779028 540 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 541}
542
76f8f6cb
ND		 543static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
544 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
545 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
546};
547
548static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 549 struct nlmsghdr *nlh)
76f8f6cb
ND		 550{
551 struct net *net = sock_net(in_skb->sk);
552 struct nlattr *tb[NETCONFA_MAX+1];
553 struct netconfmsg *ncm;
554 struct sk_buff *skb;
555 struct ipv6_devconf *devconf;
556 struct inet6_dev *in6_dev;
557 struct net_device *dev;
558 int ifindex;
559 int err;
560
561 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
562 devconf_ipv6_policy);
563 if (err < 0)
564 goto errout;
565
566 err = EINVAL;
567 if (!tb[NETCONFA_IFINDEX])
568 goto errout;
569
570 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
571 switch (ifindex) {
572 case NETCONFA_IFINDEX_ALL:
573 devconf = net->ipv6.devconf_all;
574 break;
575 case NETCONFA_IFINDEX_DEFAULT:
576 devconf = net->ipv6.devconf_dflt;
577 break;
578 default:
579 dev = __dev_get_by_index(net, ifindex);
580 if (dev == NULL)
581 goto errout;
582 in6_dev = __in6_dev_get(dev);
583 if (in6_dev == NULL)
584 goto errout;
585 devconf = &in6_dev->cnf;
586 break;
587 }
588
589 err = -ENOBUFS;
590 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
591 if (skb == NULL)
592 goto errout;
593
594 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
595 NETLINK_CB(in_skb).portid,
596 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
597 -1);
598 if (err < 0) {
599 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
600 WARN_ON(err == -EMSGSIZE);
601 kfree_skb(skb);
602 goto errout;
603 }
604 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
605errout:
606 return err;
607}
608
7a674200
ND		 609static int inet6_netconf_dump_devconf(struct sk_buff *skb,
610 struct netlink_callback *cb)
611{
612 struct net *net = sock_net(skb->sk);
613 int h, s_h;
614 int idx, s_idx;
615 struct net_device *dev;
616 struct inet6_dev *idev;
617 struct hlist_head *head;
618
619 s_h = cb->args[0];
620 s_idx = idx = cb->args[1];
621
622 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
623 idx = 0;
624 head = &net->dev_index_head[h];
625 rcu_read_lock();
63998ac2
ND		 626 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
627 net->dev_base_seq;
7a674200
ND		 628 hlist_for_each_entry_rcu(dev, head, index_hlist) {
629 if (idx < s_idx)
630 goto cont;
631 idev = __in6_dev_get(dev);
632 if (!idev)
633 goto cont;
634
635 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
636 &idev->cnf,
637 NETLINK_CB(cb->skb).portid,
638 cb->nlh->nlmsg_seq,
639 RTM_NEWNETCONF,
640 NLM_F_MULTI,
641 -1) <= 0) {
642 rcu_read_unlock();
643 goto done;
644 }
63998ac2 645 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 646cont:
647 idx++;
648 }
649 rcu_read_unlock();
650 }
651 if (h == NETDEV_HASHENTRIES) {
652 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
653 net->ipv6.devconf_all,
654 NETLINK_CB(cb->skb).portid,
655 cb->nlh->nlmsg_seq,
656 RTM_NEWNETCONF, NLM_F_MULTI,
657 -1) <= 0)
658 goto done;
659 else
660 h++;
661 }
662 if (h == NETDEV_HASHENTRIES + 1) {
663 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
664 net->ipv6.devconf_dflt,
665 NETLINK_CB(cb->skb).portid,
666 cb->nlh->nlmsg_seq,
667 RTM_NEWNETCONF, NLM_F_MULTI,
668 -1) <= 0)
669 goto done;
670 else
671 h++;
672 }
673done:
674 cb->args[0] = h;
675 cb->args[1] = idx;
676
677 return skb->len;
678}
679
1da177e4
LT		 680#ifdef CONFIG_SYSCTL
681static void dev_forward_change(struct inet6_dev *idev)
682{
683 struct net_device *dev;
684 struct inet6_ifaddr *ifa;
1da177e4
LT		 685
686 if (!idev)
687 return;
688 dev = idev->dev;
0187bdfb
BH		 689 if (idev->cnf.forwarding)
690 dev_disable_lro(dev);
1a940835 691 if (dev->flags & IFF_MULTICAST) {
2c5e8933 692 if (idev->cnf.forwarding) {
f3ee4010 693 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 694 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
695 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
696 } else {
f3ee4010 697 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 698 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
699 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
700 }
1da177e4 701 }
502a2ffd 702
703 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 704 if (ifa->flags&IFA_F_TENTATIVE)
705 continue;
1da177e4
LT		 706 if (idev->cnf.forwarding)
707 addrconf_join_anycast(ifa);
708 else
709 addrconf_leave_anycast(ifa);
710 }
f3a1bfb1
ND		 711 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
712 dev->ifindex, &idev->cnf);
1da177e4
LT		 713}
714
715
e186932b 716static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 717{
718 struct net_device *dev;
719 struct inet6_dev *idev;
720
4acd4945 721 for_each_netdev(net, dev) {
1da177e4
LT		 722 idev = __in6_dev_get(dev);
723 if (idev) {
e186932b
PE		 724 int changed = (!idev->cnf.forwarding) ^ (!newf);
725 idev->cnf.forwarding = newf;
1da177e4
LT		 726 if (changed)
727 dev_forward_change(idev);
728 }
1da177e4 729 }
1da177e4 730}
c8fecf22 731
013d97e9 732static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 733{
bff16c2f 734 struct net *net;
013d97e9
FR		 735 int old;
736
737 if (!rtnl_trylock())
738 return restart_syscall();
bff16c2f
PE		 739
740 net = (struct net *)table->extra2;
013d97e9
FR		 741 old = *p;
742 *p = newf;
b325fddb 743
013d97e9 744 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 745 if ((!newf) ^ (!old))
746 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
747 NETCONFA_IFINDEX_DEFAULT,
748 net->ipv6.devconf_dflt);
013d97e9
FR		 749 rtnl_unlock();
750 return 0;
88af182e 751 }
c8fecf22 752
e186932b 753 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 754 net->ipv6.devconf_dflt->forwarding = newf;
755 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 756 if ((!newf) ^ (!old))
757 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
758 NETCONFA_IFINDEX_ALL,
759 net->ipv6.devconf_all);
013d97e9 760 } else if ((!newf) ^ (!old))
c8fecf22 761 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 762 rtnl_unlock();
c8fecf22 763
013d97e9 764 if (newf)
7b4da532 765 rt6_purge_dflt_routers(net);
b325fddb 766 return 1;
c8fecf22 767}
1da177e4
LT		 768#endif
769
5c578aed 770/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 771void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
772{
c2e21293 773 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 774
1da177e4 775#ifdef NET_REFCNT_DEBUG
91df42be 776 pr_debug("%s\n", __func__);
1da177e4
LT		 777#endif
778
779 in6_dev_put(ifp->idev);
780
781 if (del_timer(&ifp->timer))
e21e8467 782 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
1da177e4 783
e9d3e084 784 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 785 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 786 return;
787 }
94e187c0 788 ip6_rt_put(ifp->rt);
1da177e4 789
e5785985 790 kfree_rcu(ifp, rcu);
1da177e4
LT		 791}
792
e55ffac6
BH		 793static void
794ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
795{
502a2ffd 796 struct list_head *p;
8a6ce0c0 797 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 798
799 /*
800 * Each device address list is sorted in order of scope -
801 * global before linklocal.
802 */
502a2ffd 803 list_for_each(p, &idev->addr_list) {
804 struct inet6_ifaddr *ifa
805 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 806 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 807 break;
808 }
809
b54c9b98 810 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 811}
812
ddbe5032 813static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 814{
ddbe5032 815 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 816}
817
1da177e4
LT		 818/* On success it returns ifp with increased reference count */
819
820static struct inet6_ifaddr *
821ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 822 int scope, u32 flags)
1da177e4
LT		 823{
824 struct inet6_ifaddr *ifa = NULL;
825 struct rt6_info *rt;
3a88a81d 826 unsigned int hash;
1da177e4 827 int err = 0;
d68b8270
YH		 828 int addr_type = ipv6_addr_type(addr);
829
830 if (addr_type == IPV6_ADDR_ANY ||
831 addr_type & IPV6_ADDR_MULTICAST ||
832 (!(idev->dev->flags & IFF_LOOPBACK) &&
833 addr_type & IPV6_ADDR_LOOPBACK))
834 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 835
8814c4b5 836 rcu_read_lock_bh();
1da177e4
LT		 837 if (idev->dead) {
838 err = -ENODEV; /*XXX*/
839 goto out2;
840 }
841
56d417b1 842 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 843 err = -EACCES;
844 goto out2;
845 }
846
5c578aed 847 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 848
849 /* Ignore adding duplicate addresses on an interface */
c346dca1 850 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 851 ADBG(("ipv6_add_addr: already assigned\n"));
852 err = -EEXIST;
853 goto out;
854 }
855
322f74a4 856 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 857
858 if (ifa == NULL) {
859 ADBG(("ipv6_add_addr: malloc failed\n"));
860 err = -ENOBUFS;
861 goto out;
862 }
863
8f031519 864 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 865 if (IS_ERR(rt)) {
866 err = PTR_ERR(rt);
867 goto out;
868 }
869
4e3fd7a0 870 ifa->addr = *addr;
1da177e4
LT		 871
872 spin_lock_init(&ifa->lock);
e9d3e084 873 spin_lock_init(&ifa->state_lock);
1da177e4 874 init_timer(&ifa->timer);
c2e21293 875 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 876 ifa->timer.data = (unsigned long) ifa;
877 ifa->scope = scope;
878 ifa->prefix_len = pfxlen;
879 ifa->flags = flags | IFA_F_TENTATIVE;
880 ifa->cstamp = ifa->tstamp = jiffies;
881
57f5f544
KF		 882 ifa->rt = rt;
883
1da177e4
LT		 884 ifa->idev = idev;
885 in6_dev_hold(idev);
886 /* For caller */
887 in6_ifa_hold(ifa);
888
889 /* Add to big hash table */
ddbe5032 890 hash = inet6_addr_hash(addr);
1da177e4 891
5c578aed 892 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 893 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 894
895 write_lock(&idev->lock);
896 /* Add to inet6_dev unicast addr list. */
e55ffac6 897 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 898
899#ifdef CONFIG_IPV6_PRIVACY
900 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 901 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 902 in6_ifa_hold(ifa);
903 }
904#endif
905
1da177e4
LT		 906 in6_ifa_hold(ifa);
907 write_unlock(&idev->lock);
908out2:
8814c4b5 909 rcu_read_unlock_bh();
1da177e4 910
fd92833a 911 if (likely(err == 0))
e041c683 912 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 913 else {
914 kfree(ifa);
915 ifa = ERR_PTR(err);
916 }
917
918 return ifa;
919out:
5c578aed 920 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 921 goto out2;
922}
923
924/* This function wants to get referenced ifp and releases it before return */
925
926static void ipv6_del_addr(struct inet6_ifaddr *ifp)
927{
502a2ffd 928 struct inet6_ifaddr *ifa, *ifn;
1da177e4 929 struct inet6_dev *idev = ifp->idev;
4c5ff6a6 930 int state;
1da177e4
LT		 931 int deleted = 0, onlink = 0;
932 unsigned long expires = jiffies;
933
4c5ff6a6
HX		 934 spin_lock_bh(&ifp->state_lock);
935 state = ifp->state;
e9d3e084 936 ifp->state = INET6_IFADDR_STATE_DEAD;
4c5ff6a6
HX		 937 spin_unlock_bh(&ifp->state_lock);
938
939 if (state == INET6_IFADDR_STATE_DEAD)
940 goto out;
1da177e4 941
5c578aed 942 spin_lock_bh(&addrconf_hash_lock);
943 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 944 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 945
946 write_lock_bh(&idev->lock);
947#ifdef CONFIG_IPV6_PRIVACY
948 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 949 list_del(&ifp->tmp_list);
950 if (ifp->ifpub) {
951 in6_ifa_put(ifp->ifpub);
952 ifp->ifpub = NULL;
1da177e4 953 }
372e6c8f 954 __in6_ifa_put(ifp);
1da177e4
LT		 955 }
956#endif
957
502a2ffd 958 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
1da177e4 959 if (ifa == ifp) {
502a2ffd 960 list_del_init(&ifp->if_list);
1da177e4 961 __in6_ifa_put(ifp);
502a2ffd 962
1da177e4
LT		 963 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
964 break;
965 deleted = 1;
1d142804 966 continue;
1da177e4
LT		 967 } else if (ifp->flags & IFA_F_PERMANENT) {
968 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
969 ifp->prefix_len)) {
970 if (ifa->flags & IFA_F_PERMANENT) {
971 onlink = 1;
972 if (deleted)
973 break;
974 } else {
975 unsigned long lifetime;
976
977 if (!onlink)
978 onlink = -1;
979
980 spin_lock(&ifa->lock);
4bed72e4
YH		 981
982 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
983 /*
984 * Note: Because this address is
985 * not permanent, lifetime <
986 * LONG_MAX / HZ here.
987 */
1da177e4
LT		 988 if (time_before(expires,
989 ifa->tstamp + lifetime * HZ))
990 expires = ifa->tstamp + lifetime * HZ;
991 spin_unlock(&ifa->lock);
992 }
993 }
994 }
995 }
996 write_unlock_bh(&idev->lock);
997
b2238566
AV		 998 addrconf_del_timer(ifp);
999
1da177e4
LT		 1000 ipv6_ifa_notify(RTM_DELADDR, ifp);
1001
e041c683 1002 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4 1003
1da177e4
LT		 1004 /*
1005 * Purge or update corresponding prefix
1006 *
1007 * 1) we don't purge prefix here if address was not permanent.
1008 * prefix is managed by its own lifetime.
1009 * 2) if there're no addresses, delete prefix.
1010 * 3) if there're still other permanent address(es),
1011 * corresponding prefix is still permanent.
1012 * 4) otherwise, update prefix lifetime to the
1013 * longest valid lifetime among the corresponding
1014 * addresses on the device.
1015 * Note: subsequent RA will update lifetime.
1016 *
1017 * --yoshfuji
1018 */
1019 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
1020 struct in6_addr prefix;
1021 struct rt6_info *rt;
64c6d08e 1022
1da177e4 1023 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
1da177e4 1024
21caa662
RK		 1025 rt = addrconf_get_prefix_route(&prefix,
1026 ifp->prefix_len,
1027 ifp->idev->dev,
1028 0, RTF_GATEWAY | RTF_DEFAULT);
1029
1030 if (rt) {
1da177e4 1031 if (onlink == 0) {
e0a1ad73 1032 ip6_del_rt(rt);
1da177e4
LT		 1033 rt = NULL;
1034 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1716a961 1035 rt6_set_expires(rt, expires);
1da177e4
LT		 1036 }
1037 }
94e187c0 1038 ip6_rt_put(rt);
1da177e4
LT		 1039 }
1040
c3968a85
DW		 1041 /* clean up prefsrc entries */
1042 rt6_remove_prefsrc(ifp);
4c5ff6a6 1043out:
1da177e4
LT		 1044 in6_ifa_put(ifp);
1045}
1046
1047#ifdef CONFIG_IPV6_PRIVACY
1048static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1049{
1050 struct inet6_dev *idev = ifp->idev;
1051 struct in6_addr addr, *tmpaddr;
76f793e3 1052 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1053 unsigned long regen_advance;
1da177e4
LT		 1054 int tmp_plen;
1055 int ret = 0;
1056 int max_addresses;
95c385b4 1057 u32 addr_flags;
76f793e3 1058 unsigned long now = jiffies;
1da177e4
LT		 1059
1060 write_lock(&idev->lock);
1061 if (ift) {
1062 spin_lock_bh(&ift->lock);
1063 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1064 spin_unlock_bh(&ift->lock);
1065 tmpaddr = &addr;
1066 } else {
1067 tmpaddr = NULL;
1068 }
1069retry:
1070 in6_dev_hold(idev);
1071 if (idev->cnf.use_tempaddr <= 0) {
1072 write_unlock(&idev->lock);
f3213831 1073 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1074 in6_dev_put(idev);
1075 ret = -1;
1076 goto out;
1077 }
1078 spin_lock_bh(&ifp->lock);
1079 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1080 idev->cnf.use_tempaddr = -1; /*XXX*/
1081 spin_unlock_bh(&ifp->lock);
1082 write_unlock(&idev->lock);
f3213831
JP		 1083 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1084 __func__);
1da177e4
LT		 1085 in6_dev_put(idev);
1086 ret = -1;
1087 goto out;
1088 }
1089 in6_ifa_hold(ifp);
1090 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 1091 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1092 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1093 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 1094 tmp_valid_lft = min_t(__u32,
1095 ifp->valid_lft,
7a876b0e 1096 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 1097 tmp_prefered_lft = min_t(__u32,
1098 ifp->prefered_lft,
7a876b0e 1099 idev->cnf.temp_prefered_lft + age -
784e2710 1100 idev->cnf.max_desync_factor);
1da177e4
LT		 1101 tmp_plen = ifp->prefix_len;
1102 max_addresses = idev->cnf.max_addresses;
1da177e4
LT		 1103 tmp_tstamp = ifp->tstamp;
1104 spin_unlock_bh(&ifp->lock);
1105
eac55bf9
BB		 1106 regen_advance = idev->cnf.regen_max_retry *
1107 idev->cnf.dad_transmits *
1108 idev->nd_parms->retrans_time / HZ;
1da177e4 1109 write_unlock(&idev->lock);
95c385b4 1110
eac55bf9
BB		 1111 /* A temporary address is created only if this calculated Preferred
1112 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1113 * an implementation must not create a temporary address with a zero
1114 * Preferred Lifetime.
1115 */
1116 if (tmp_prefered_lft <= regen_advance) {
1117 in6_ifa_put(ifp);
1118 in6_dev_put(idev);
1119 ret = -1;
1120 goto out;
1121 }
1122
95c385b4
NH		 1123 addr_flags = IFA_F_TEMPORARY;
1124 /* set in addrconf_prefix_rcv() */
1125 if (ifp->flags & IFA_F_OPTIMISTIC)
1126 addr_flags |= IFA_F_OPTIMISTIC;
1127
1da177e4 1128 ift = !max_addresses ||
1ab1457c 1129 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 1130 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 1131 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
1132 addr_flags) : NULL;
3f0d2ba0 1133 if (IS_ERR_OR_NULL(ift)) {
1da177e4
LT		 1134 in6_ifa_put(ifp);
1135 in6_dev_put(idev);
f3213831 1136 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4
LT		 1137 tmpaddr = &addr;
1138 write_lock(&idev->lock);
1139 goto retry;
1140 }
1141
1142 spin_lock_bh(&ift->lock);
1143 ift->ifpub = ifp;
1144 ift->valid_lft = tmp_valid_lft;
1145 ift->prefered_lft = tmp_prefered_lft;
76f793e3 1146 ift->cstamp = now;
1da177e4
LT		 1147 ift->tstamp = tmp_tstamp;
1148 spin_unlock_bh(&ift->lock);
1149
cf22f9a2 1150 addrconf_dad_start(ift);
1da177e4
LT		 1151 in6_ifa_put(ift);
1152 in6_dev_put(idev);
1153out:
1154 return ret;
1155}
1156#endif
1157
1158/*
072047e4 1159 * Choose an appropriate source address (RFC3484)
1da177e4 1160 */
a9b05723
YH		 1161enum {
1162 IPV6_SADDR_RULE_INIT = 0,
1163 IPV6_SADDR_RULE_LOCAL,
1164 IPV6_SADDR_RULE_SCOPE,
1165 IPV6_SADDR_RULE_PREFERRED,
1166#ifdef CONFIG_IPV6_MIP6
1167 IPV6_SADDR_RULE_HOA,
1168#endif
1169 IPV6_SADDR_RULE_OIF,
1170 IPV6_SADDR_RULE_LABEL,
1171#ifdef CONFIG_IPV6_PRIVACY
1172 IPV6_SADDR_RULE_PRIVACY,
1173#endif
1174 IPV6_SADDR_RULE_ORCHID,
1175 IPV6_SADDR_RULE_PREFIX,
1176 IPV6_SADDR_RULE_MAX
1177};
1178
072047e4 1179struct ipv6_saddr_score {
a9b05723
YH		 1180 int rule;
1181 int addr_type;
1182 struct inet6_ifaddr *ifa;
1183 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1184 int scopedist;
1185 int matchlen;
072047e4
YH		 1186};
1187
a9b05723 1188struct ipv6_saddr_dst {
9acd9f3a 1189 const struct in6_addr *addr;
a9b05723
YH		 1190 int ifindex;
1191 int scope;
1192 int label;
7cbca67c 1193 unsigned int prefs;
a9b05723 1194};
072047e4 1195
b6f99a21 1196static inline int ipv6_saddr_preferred(int type)
1da177e4 1197{
45bb0060 1198 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1199 return 1;
1200 return 0;
1da177e4
LT		 1201}
1202
3de23255
BT		 1203static int ipv6_get_saddr_eval(struct net *net,
1204 struct ipv6_saddr_score *score,
a9b05723
YH		 1205 struct ipv6_saddr_dst *dst,
1206 int i)
1207{
1208 int ret;
1209
1210 if (i <= score->rule) {
1211 switch (i) {
1212 case IPV6_SADDR_RULE_SCOPE:
1213 ret = score->scopedist;
1214 break;
1215 case IPV6_SADDR_RULE_PREFIX:
1216 ret = score->matchlen;
1217 break;
1218 default:
1219 ret = !!test_bit(i, score->scorebits);
1220 }
1221 goto out;
1222 }
1223
1224 switch (i) {
1225 case IPV6_SADDR_RULE_INIT:
1226 /* Rule 0: remember if hiscore is not ready yet */
1227 ret = !!score->ifa;
1228 break;
1229 case IPV6_SADDR_RULE_LOCAL:
1230 /* Rule 1: Prefer same address */
1231 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1232 break;
1233 case IPV6_SADDR_RULE_SCOPE:
1234 /* Rule 2: Prefer appropriate scope
1235 *
1236 * ret
1237 * ^
1238 * -1 | d 15
1239 * ---+--+-+---> scope
1240 * |
1241 * | d is scope of the destination.
1242 * B-d | \
1243 * | \ <- smaller scope is better if
1244 * B-15 | \ if scope is enough for destinaion.
1245 * | ret = B - scope (-1 <= scope >= d <= 15).
1246 * d-C-1 | /
1247 * |/ <- greater is better
1248 * -C / if scope is not enough for destination.
1249 * /| ret = scope - C (-1 <= d < scope <= 15).
1250 *
1251 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1252 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1253 * Assume B = 0 and we get C > 29.
1254 */
1255 ret = __ipv6_addr_src_scope(score->addr_type);
1256 if (ret >= dst->scope)
1257 ret = -ret;
1258 else
1259 ret -= 128; /* 30 is enough */
1260 score->scopedist = ret;
1261 break;
1262 case IPV6_SADDR_RULE_PREFERRED:
1263 /* Rule 3: Avoid deprecated and optimistic addresses */
1264 ret = ipv6_saddr_preferred(score->addr_type) ||
1265 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1266 break;
1267#ifdef CONFIG_IPV6_MIP6
1268 case IPV6_SADDR_RULE_HOA:
7cbca67c 1269 {
a9b05723 1270 /* Rule 4: Prefer home address */
7cbca67c
YH		 1271 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1272 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1273 break;
7cbca67c 1274 }
a9b05723
YH		 1275#endif
1276 case IPV6_SADDR_RULE_OIF:
1277 /* Rule 5: Prefer outgoing interface */
1278 ret = (!dst->ifindex ||
1279 dst->ifindex == score->ifa->idev->dev->ifindex);
1280 break;
1281 case IPV6_SADDR_RULE_LABEL:
1282 /* Rule 6: Prefer matching label */
3de23255
BT		 1283 ret = ipv6_addr_label(net,
1284 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1285 score->ifa->idev->dev->ifindex) == dst->label;
1286 break;
1287#ifdef CONFIG_IPV6_PRIVACY
1288 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1289 {
a9b05723 1290 /* Rule 7: Prefer public address
25985edc 1291 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1292 */
7cbca67c
YH		 1293 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1294 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1295 score->ifa->idev->cnf.use_tempaddr >= 2;
1296 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1297 break;
7cbca67c 1298 }
a9b05723
YH		 1299#endif
1300 case IPV6_SADDR_RULE_ORCHID:
1301 /* Rule 8-: Prefer ORCHID vs ORCHID or
1302 * non-ORCHID vs non-ORCHID
1303 */
1304 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1305 ipv6_addr_orchid(dst->addr));
1306 break;
1307 case IPV6_SADDR_RULE_PREFIX:
1308 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1309 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1310 if (ret > score->ifa->prefix_len)
1311 ret = score->ifa->prefix_len;
1312 score->matchlen = ret;
a9b05723
YH		 1313 break;
1314 default:
1315 ret = 0;
1316 }
1317
1318 if (ret)
1319 __set_bit(i, score->scorebits);
1320 score->rule = i;
1321out:
1322 return ret;
1323}
1324
b3f644fc 1325int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1326 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1327 struct in6_addr *saddr)
1da177e4 1328{
a9b05723
YH		 1329 struct ipv6_saddr_score scores[2],
1330 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1331 struct ipv6_saddr_dst dst;
072047e4 1332 struct net_device *dev;
a9b05723 1333 int dst_type;
1da177e4 1334
a9b05723
YH		 1335 dst_type = __ipv6_addr_type(daddr);
1336 dst.addr = daddr;
1337 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1338 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1339 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1340 dst.prefs = prefs;
a9b05723
YH		 1341
1342 hiscore->rule = -1;
1343 hiscore->ifa = NULL;
1da177e4 1344
8814c4b5 1345 rcu_read_lock();
1da177e4 1346
c6d14c84 1347 for_each_netdev_rcu(net, dev) {
072047e4 1348 struct inet6_dev *idev;
072047e4 1349
a9b05723 1350 /* Candidate Source Address (section 4)
072047e4
YH		 1351 * - multicast and link-local destination address,
1352 * the set of candidate source address MUST only
1353 * include addresses assigned to interfaces
1354 * belonging to the same link as the outgoing
1355 * interface.
1356 * (- For site-local destination addresses, the
1357 * set of candidate source addresses MUST only
1358 * include addresses assigned to interfaces
1359 * belonging to the same site as the outgoing
1360 * interface.)
1361 */
a9b05723
YH		 1362 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1363 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1364 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1365 continue;
1da177e4 1366
1da177e4 1367 idev = __in6_dev_get(dev);
072047e4
YH		 1368 if (!idev)
1369 continue;
1370
1371 read_lock_bh(&idev->lock);
502a2ffd 1372 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1373 int i;
072047e4 1374
a9b05723 1375 /*
6b3ae80a
YH		 1376 * - Tentative Address (RFC2462 section 5.4)
1377 * - A tentative address is not considered
1378 * "assigned to an interface" in the traditional
95c385b4 1379 * sense, unless it is also flagged as optimistic.
6b3ae80a 1380 * - Candidate Source Address (section 4)
072047e4
YH		 1381 * - In any case, anycast addresses, multicast
1382 * addresses, and the unspecified address MUST
1383 * NOT be included in a candidate set.
1384 */
a9b05723
YH		 1385 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1386 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1387 continue;
a9b05723
YH		 1388
1389 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1390
1391 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1392 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1393 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1394 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1395 "assigned as unicast address on %s",
1396 dev->name);
1397 continue;
1398 }
1399
a9b05723
YH		 1400 score->rule = -1;
1401 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1402
1403 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1404 int minihiscore, miniscore;
1405
3de23255
BT		 1406 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1407 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1408
1409 if (minihiscore > miniscore) {
1410 if (i == IPV6_SADDR_RULE_SCOPE &&
1411 score->scopedist > 0) {
1412 /*
1413 * special case:
1414 * each remaining entry
1415 * has too small (not enough)
1416 * scope, because ifa entries
1417 * are sorted by their scope
1418 * values.
1419 */
1420 goto try_nextdev;
1421 }
1422 break;
1423 } else if (minihiscore < miniscore) {
a9b05723
YH		 1424 if (hiscore->ifa)
1425 in6_ifa_put(hiscore->ifa);
1426
1427 in6_ifa_hold(score->ifa);
1428
a0bffffc 1429 swap(hiscore, score);
a9b05723
YH		 1430
1431 /* restore our iterator */
1432 score->ifa = hiscore->ifa;
1433
1434 break;
1da177e4 1435 }
072047e4 1436 }
1da177e4 1437 }
a9b05723 1438try_nextdev:
072047e4 1439 read_unlock_bh(&idev->lock);
1da177e4 1440 }
8814c4b5 1441 rcu_read_unlock();
1da177e4 1442
a9b05723 1443 if (!hiscore->ifa)
072047e4 1444 return -EADDRNOTAVAIL;
1ab1457c 1445
4e3fd7a0 1446 *saddr = hiscore->ifa->addr;
a9b05723 1447 in6_ifa_put(hiscore->ifa);
072047e4 1448 return 0;
1da177e4 1449}
5e5f3f0f 1450EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1451
95c385b4
NH		 1452int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1453 unsigned char banned_flags)
1da177e4
LT		 1454{
1455 struct inet6_dev *idev;
1456 int err = -EADDRNOTAVAIL;
1457
8814c4b5 1458 rcu_read_lock();
e21e8467
SH		 1459 idev = __in6_dev_get(dev);
1460 if (idev) {
1da177e4
LT		 1461 struct inet6_ifaddr *ifp;
1462
1463 read_lock_bh(&idev->lock);
502a2ffd 1464 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1465 if (ifp->scope == IFA_LINK &&
1466 !(ifp->flags & banned_flags)) {
4e3fd7a0 1467 *addr = ifp->addr;
1da177e4
LT		 1468 err = 0;
1469 break;
1470 }
1471 }
1472 read_unlock_bh(&idev->lock);
1473 }
8814c4b5 1474 rcu_read_unlock();
1da177e4
LT		 1475 return err;
1476}
1477
1478static int ipv6_count_addresses(struct inet6_dev *idev)
1479{
1480 int cnt = 0;
1481 struct inet6_ifaddr *ifp;
1482
1483 read_lock_bh(&idev->lock);
502a2ffd 1484 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1485 cnt++;
1486 read_unlock_bh(&idev->lock);
1487 return cnt;
1488}
1489
b71d1d42 1490int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
bfeade08 1491 struct net_device *dev, int strict)
1da177e4 1492{
eedf042a 1493 struct inet6_ifaddr *ifp;
ddbe5032 1494 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1495
5c578aed 1496 rcu_read_lock_bh();
b67bfe0d 1497 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1498 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1499 continue;
1da177e4 1500 if (ipv6_addr_equal(&ifp->addr, addr) &&
eedf042a
SH		 1501 !(ifp->flags&IFA_F_TENTATIVE) &&
1502 (dev == NULL || ifp->idev->dev == dev ||
1503 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1504 rcu_read_unlock_bh();
1505 return 1;
1da177e4
LT		 1506 }
1507 }
5c578aed 1508
eedf042a
SH		 1509 rcu_read_unlock_bh();
1510 return 0;
1da177e4 1511}
7159039a
YH		 1512EXPORT_SYMBOL(ipv6_chk_addr);
1513
3e81c6da
DM		 1514static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1515 struct net_device *dev)
1da177e4 1516{
ddbe5032 1517 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1518 struct inet6_ifaddr *ifp;
1da177e4 1519
b67bfe0d 1520 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1521 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1522 continue;
1da177e4
LT		 1523 if (ipv6_addr_equal(&ifp->addr, addr)) {
1524 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1525 return true;
1da177e4
LT		 1526 }
1527 }
3e81c6da 1528 return false;
1da177e4
LT		 1529}
1530
b71d1d42 1531int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1532{
1533 struct inet6_dev *idev;
1534 struct inet6_ifaddr *ifa;
1535 int onlink;
1536
1537 onlink = 0;
1538 rcu_read_lock();
1539 idev = __in6_dev_get(dev);
1540 if (idev) {
1541 read_lock_bh(&idev->lock);
502a2ffd 1542 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1543 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1544 ifa->prefix_len);
1545 if (onlink)
1546 break;
1547 }
1548 read_unlock_bh(&idev->lock);
1549 }
1550 rcu_read_unlock();
1551 return onlink;
1552}
52eeeb84
YH		 1553EXPORT_SYMBOL(ipv6_chk_prefix);
1554
9acd9f3a 1555struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1556 struct net_device *dev, int strict)
1da177e4 1557{
b79d1d54 1558 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1559 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1560
5c578aed 1561 rcu_read_lock_bh();
b67bfe0d 1562 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1563 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1564 continue;
1da177e4
LT		 1565 if (ipv6_addr_equal(&ifp->addr, addr)) {
1566 if (dev == NULL || ifp->idev->dev == dev ||
1567 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1568 result = ifp;
1da177e4
LT		 1569 in6_ifa_hold(ifp);
1570 break;
1571 }
1572 }
1573 }
5c578aed 1574 rcu_read_unlock_bh();
1da177e4 1575
b79d1d54 1576 return result;
1da177e4
LT		 1577}
1578
1da177e4
LT		 1579/* Gets referenced address, destroys ifaddr */
1580
cc411d0b 1581static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1582{
1da177e4
LT		 1583 if (ifp->flags&IFA_F_PERMANENT) {
1584 spin_lock_bh(&ifp->lock);
1585 addrconf_del_timer(ifp);
1586 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1587 if (dad_failed)
1588 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1589 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1590 if (dad_failed)
1591 ipv6_ifa_notify(0, ifp);
1da177e4
LT		 1592 in6_ifa_put(ifp);
1593#ifdef CONFIG_IPV6_PRIVACY
1594 } else if (ifp->flags&IFA_F_TEMPORARY) {
1595 struct inet6_ifaddr *ifpub;
1596 spin_lock_bh(&ifp->lock);
1597 ifpub = ifp->ifpub;
1598 if (ifpub) {
1599 in6_ifa_hold(ifpub);
1600 spin_unlock_bh(&ifp->lock);
1601 ipv6_create_tempaddr(ifpub, ifp);
1602 in6_ifa_put(ifpub);
1603 } else {
1604 spin_unlock_bh(&ifp->lock);
1605 }
1606 ipv6_del_addr(ifp);
1607#endif
1608 } else
1609 ipv6_del_addr(ifp);
1610}
1611
f2344a13
HX		 1612static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1613{
1614 int err = -ENOENT;
1615
1616 spin_lock(&ifp->state_lock);
1617 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1618 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1619 err = 0;
1620 }
1621 spin_unlock(&ifp->state_lock);
1622
1623 return err;
1624}
1625
3c21edbd
YH		 1626void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1627{
1b34be74 1628 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1629
853dc2e0
UB		 1630 if (addrconf_dad_end(ifp)) {
1631 in6_ifa_put(ifp);
f2344a13 1632 return;
853dc2e0 1633 }
f2344a13 1634
e87cc472
JP		 1635 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1636 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1637
1b34be74
YH		 1638 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1639 struct in6_addr addr;
1640
1641 addr.s6_addr32[0] = htonl(0xfe800000);
1642 addr.s6_addr32[1] = 0;
1643
1644 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1645 ipv6_addr_equal(&ifp->addr, &addr)) {
1646 /* DAD failed for link-local based on MAC address */
1647 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1648
f3213831 1649 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1650 ifp->idev->dev->name);
1b34be74
YH		 1651 }
1652 }
1653
cc411d0b 1654 addrconf_dad_stop(ifp, 1);
3c21edbd 1655}
1da177e4
LT		 1656
1657/* Join to solicited addr multicast group. */
1658
b71d1d42 1659void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1660{
1661 struct in6_addr maddr;
1662
1663 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1664 return;
1665
1666 addrconf_addr_solict_mult(addr, &maddr);
1667 ipv6_dev_mc_inc(dev, &maddr);
1668}
1669
b71d1d42 1670void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1671{
1672 struct in6_addr maddr;
1673
1674 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1675 return;
1676
1677 addrconf_addr_solict_mult(addr, &maddr);
1678 __ipv6_dev_mc_dec(idev, &maddr);
1679}
1680
20380731 1681static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1682{
1683 struct in6_addr addr;
2bda8a0c
BM		 1684 if (ifp->prefix_len == 127) /* RFC 6164 */
1685 return;
1da177e4
LT		 1686 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1687 if (ipv6_addr_any(&addr))
1688 return;
1689 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1690}
1691
20380731 1692static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1693{
1694 struct in6_addr addr;
32019e65
YH		 1695 if (ifp->prefix_len == 127) /* RFC 6164 */
1696 return;
1da177e4
LT		 1697 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1698 if (ipv6_addr_any(&addr))
1699 return;
1700 __ipv6_dev_ac_dec(ifp->idev, &addr);
1701}
1702
073a8e0e
YH		 1703static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1704{
1705 if (dev->addr_len != ETH_ALEN)
1706 return -1;
1707 memcpy(eui, dev->dev_addr, 3);
1708 memcpy(eui + 5, dev->dev_addr + 3, 3);
1709
1710 /*
1711 * The zSeries OSA network cards can be shared among various
1712 * OS instances, but the OSA cards have only one MAC address.
1713 * This leads to duplicate address conflicts in conjunction
1714 * with IPv6 if more than one instance uses the same card.
1715 *
1716 * The driver for these cards can deliver a unique 16-bit
1717 * identifier for each instance sharing the same card. It is
1718 * placed instead of 0xFFFE in the interface identifier. The
1719 * "u" bit of the interface identifier is not inverted in this
1720 * case. Hence the resulting interface identifier has local
1721 * scope according to RFC2373.
1722 */
1723 if (dev->dev_id) {
1724 eui[3] = (dev->dev_id >> 8) & 0xFF;
1725 eui[4] = dev->dev_id & 0xFF;
1726 } else {
1727 eui[3] = 0xFF;
1728 eui[4] = 0xFE;
1729 eui[0] ^= 2;
1730 }
1731 return 0;
1732}
1733
06a4c1c5 1734static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1735{
1736 if (dev->addr_len != IEEE802154_ADDR_LEN)
1737 return -1;
1738 memcpy(eui, dev->dev_addr, 8);
5e98a36e 1739 eui[0] ^= 2;
06a4c1c5 1740 return 0;
1741}
1742
cb6bf355
YH		 1743static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1744{
1745 union fwnet_hwaddr *ha;
1746
1747 if (dev->addr_len != FWNET_ALEN)
1748 return -1;
1749
1750 ha = (union fwnet_hwaddr *)dev->dev_addr;
1751
1752 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1753 eui[0] ^= 2;
1754 return 0;
1755}
1756
073a8e0e
YH		 1757static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1758{
1759 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1760 if (dev->addr_len != ARCNET_ALEN)
1761 return -1;
1762 memset(eui, 0, 7);
8e5e8f30 1763 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1764 return 0;
1765}
1766
1767static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1768{
1769 if (dev->addr_len != INFINIBAND_ALEN)
1770 return -1;
1771 memcpy(eui, dev->dev_addr + 12, 8);
1772 eui[0] |= 2;
1773 return 0;
1774}
1775
c61393ea 1776static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1777{
9af28511
SH		 1778 if (addr == 0)
1779 return -1;
dfd982ba
YH		 1780 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1781 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1782 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1783 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1784 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1785 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1786 eui[1] = 0;
1787 eui[2] = 0x5E;
1788 eui[3] = 0xFE;
1789 memcpy(eui + 4, &addr, 4);
1790 return 0;
1791}
dfd982ba
YH		 1792
1793static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1794{
1795 if (dev->priv_flags & IFF_ISATAP)
1796 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1797 return -1;
1798}
1799
aee80b54 1800static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1801{
1802 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1803}
1804
1da177e4
LT		 1805static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1806{
1807 switch (dev->type) {
1808 case ARPHRD_ETHER:
1809 case ARPHRD_FDDI:
073a8e0e 1810 return addrconf_ifid_eui48(eui, dev);
1da177e4 1811 case ARPHRD_ARCNET:
073a8e0e 1812 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1813 case ARPHRD_INFINIBAND:
073a8e0e 1814 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1815 case ARPHRD_SIT:
dfd982ba 1816 return addrconf_ifid_sit(eui, dev);
aee80b54 1817 case ARPHRD_IPGRE:
1818 return addrconf_ifid_gre(eui, dev);
06a4c1c5 1819 case ARPHRD_IEEE802154:
1820 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 1821 case ARPHRD_IEEE1394:
1822 return addrconf_ifid_ieee1394(eui, dev);
1da177e4
LT		 1823 }
1824 return -1;
1825}
1826
1827static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1828{
1829 int err = -1;
1830 struct inet6_ifaddr *ifp;
1831
1832 read_lock_bh(&idev->lock);
502a2ffd 1833 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 1834 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1835 memcpy(eui, ifp->addr.s6_addr+8, 8);
1836 err = 0;
1837 break;
1838 }
1839 }
1840 read_unlock_bh(&idev->lock);
1841 return err;
1842}
1843
1844#ifdef CONFIG_IPV6_PRIVACY
1845/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 1846static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 1847{
1da177e4 1848regen:
955189ef 1849 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1850 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1851
1852 /*
1853 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1854 * check if generated address is not inappropriate
1855 *
1856 * - Reserved subnet anycast (RFC 2526)
1857 * 11111101 11....11 1xxxxxxx
c7dc89c0 1858 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1859 * 00-00-5E-FE-xx-xx-xx-xx
1860 * - value 0
1861 * - XXX: already assigned to an address on the device
1862 */
1ab1457c 1863 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1864 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1865 (idev->rndid[7]&0x80))
1866 goto regen;
1867 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1868 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1869 goto regen;
1870 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1871 goto regen;
1872 }
1da177e4
LT		 1873}
1874
1875static void ipv6_regen_rndid(unsigned long data)
1876{
1877 struct inet6_dev *idev = (struct inet6_dev *) data;
1878 unsigned long expires;
1879
8814c4b5 1880 rcu_read_lock_bh();
1da177e4
LT		 1881 write_lock_bh(&idev->lock);
1882
1883 if (idev->dead)
1884 goto out;
1885
eb7e0575 1886 __ipv6_regen_rndid(idev);
1ab1457c 1887
1da177e4 1888 expires = jiffies +
1ab1457c 1889 idev->cnf.temp_prefered_lft * HZ -
784e2710
BH		 1890 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1891 idev->cnf.max_desync_factor * HZ;
1da177e4 1892 if (time_before(expires, jiffies)) {
f3213831
JP		 1893 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1894 __func__, idev->dev->name);
1da177e4
LT		 1895 goto out;
1896 }
1897
1898 if (!mod_timer(&idev->regen_timer, expires))
1899 in6_dev_hold(idev);
1900
1901out:
1902 write_unlock_bh(&idev->lock);
8814c4b5 1903 rcu_read_unlock_bh();
1da177e4
LT		 1904 in6_dev_put(idev);
1905}
1906
eb7e0575 1907static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 1908{
1da177e4 1909 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 1910 __ipv6_regen_rndid(idev);
1da177e4
LT		 1911}
1912#endif
1913
1914/*
1915 * Add prefix route.
1916 */
1917
1918static void
1919addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1920 unsigned long expires, u32 flags)
1da177e4 1921{
86872cb5
TG		 1922 struct fib6_config cfg = {
1923 .fc_table = RT6_TABLE_PREFIX,
1924 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1925 .fc_ifindex = dev->ifindex,
1926 .fc_expires = expires,
1927 .fc_dst_len = plen,
1928 .fc_flags = RTF_UP | flags,
c346dca1 1929 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1930 .fc_protocol = RTPROT_KERNEL,
86872cb5 1931 };
1da177e4 1932
4e3fd7a0 1933 cfg.fc_dst = *pfx;
1da177e4
LT		 1934
1935 /* Prevent useless cloning on PtP SIT.
1936 This thing is done here expecting that the whole
1937 class of non-broadcast devices need not cloning.
1938 */
07a93626 1939#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 1940 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1941 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1942#endif
1da177e4 1943
86872cb5 1944 ip6_route_add(&cfg);
1da177e4
LT		 1945}
1946
14ef37b6
AH		 1947
1948static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1949 int plen,
1950 const struct net_device *dev,
1951 u32 flags, u32 noflags)
1952{
1953 struct fib6_node *fn;
1954 struct rt6_info *rt = NULL;
1955 struct fib6_table *table;
1956
1957 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1958 if (table == NULL)
1959 return NULL;
1960
5744dd9b 1961 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 1962 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1963 if (!fn)
1964 goto out;
1965 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 1966 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 1967 continue;
1968 if ((rt->rt6i_flags & flags) != flags)
1969 continue;
85da53bf 1970 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 1971 continue;
1972 dst_hold(&rt->dst);
1973 break;
1974 }
1975out:
5744dd9b 1976 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 1977 return rt;
1978}
1979
1980
1da177e4
LT		 1981/* Create "default" multicast route to the interface */
1982
1983static void addrconf_add_mroute(struct net_device *dev)
1984{
86872cb5
TG		 1985 struct fib6_config cfg = {
1986 .fc_table = RT6_TABLE_LOCAL,
1987 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1988 .fc_ifindex = dev->ifindex,
1989 .fc_dst_len = 8,
1990 .fc_flags = RTF_UP,
c346dca1 1991 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1992 };
1993
1994 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1995
1996 ip6_route_add(&cfg);
1da177e4
LT		 1997}
1998
07a93626 1999#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2000static void sit_route_add(struct net_device *dev)
2001{
86872cb5
TG		 2002 struct fib6_config cfg = {
2003 .fc_table = RT6_TABLE_MAIN,
2004 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2005 .fc_ifindex = dev->ifindex,
2006 .fc_dst_len = 96,
2007 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 2008 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 2009 };
1da177e4
LT		 2010
2011 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 2012 ip6_route_add(&cfg);
1da177e4 2013}
0be669bb 2014#endif
1da177e4 2015
1da177e4
LT		 2016static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2017{
2018 struct inet6_dev *idev;
2019
2020 ASSERT_RTNL();
2021
e21e8467
SH		 2022 idev = ipv6_find_idev(dev);
2023 if (!idev)
64e724f6
BH		 2024 return ERR_PTR(-ENOBUFS);
2025
2026 if (idev->cnf.disable_ipv6)
2027 return ERR_PTR(-EACCES);
1da177e4
LT		 2028
2029 /* Add default multicast route */
4af04aba
LW		 2030 if (!(dev->flags & IFF_LOOPBACK))
2031 addrconf_add_mroute(dev);
1da177e4 2032
1da177e4
LT		 2033 return idev;
2034}
2035
e6bff995 2036void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2037{
2038 struct prefix_info *pinfo;
2039 __u32 valid_lft;
2040 __u32 prefered_lft;
2041 int addr_type;
1da177e4 2042 struct inet6_dev *in6_dev;
56d417b1 2043 struct net *net = dev_net(dev);
1da177e4
LT		 2044
2045 pinfo = (struct prefix_info *) opt;
1ab1457c 2046
1da177e4
LT		 2047 if (len < sizeof(struct prefix_info)) {
2048 ADBG(("addrconf: prefix option too short\n"));
2049 return;
2050 }
1ab1457c 2051
1da177e4
LT		 2052 /*
2053 * Validation checks ([ADDRCONF], page 19)
2054 */
2055
2056 addr_type = ipv6_addr_type(&pinfo->prefix);
2057
2058 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2059 return;
2060
2061 valid_lft = ntohl(pinfo->valid);
2062 prefered_lft = ntohl(pinfo->prefered);
2063
2064 if (prefered_lft > valid_lft) {
e87cc472 2065 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2066 return;
2067 }
2068
2069 in6_dev = in6_dev_get(dev);
2070
2071 if (in6_dev == NULL) {
e87cc472
JP		 2072 net_dbg_ratelimited("addrconf: device %s not configured\n",
2073 dev->name);
1da177e4
LT		 2074 return;
2075 }
2076
2077 /*
2078 * Two things going on here:
2079 * 1) Add routes for on-link prefixes
2080 * 2) Configure prefixes with the auto flag set
2081 */
2082
4bed72e4
YH		 2083 if (pinfo->onlink) {
2084 struct rt6_info *rt;
2085 unsigned long rt_expires;
2086
6f704992
YH		 2087 /* Avoid arithmetic overflow. Really, we could
2088 * save rt_expires in seconds, likely valid_lft,
2089 * but it would require division in fib gc, that it
2090 * not good.
2091 */
4bed72e4
YH		 2092 if (HZ > USER_HZ)
2093 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2094 else
2095 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2096
4bed72e4
YH		 2097 if (addrconf_finite_timeout(rt_expires))
2098 rt_expires *= HZ;
1da177e4 2099
14ef37b6
AH		 2100 rt = addrconf_get_prefix_route(&pinfo->prefix,
2101 pinfo->prefix_len,
2102 dev,
2103 RTF_ADDRCONF | RTF_PREFIX_RT,
2104 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2105
14ef37b6 2106 if (rt) {
6f704992
YH		 2107 /* Autoconf prefix route */
2108 if (valid_lft == 0) {
2109 ip6_del_rt(rt);
2110 rt = NULL;
4bed72e4 2111 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2112 /* not infinity */
1716a961 2113 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2114 } else {
1716a961 2115 rt6_clean_expires(rt);
1da177e4
LT		 2116 }
2117 } else if (valid_lft) {
6f704992 2118 clock_t expires = 0;
4bed72e4
YH		 2119 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2120 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2121 /* not infinity */
2122 flags |= RTF_EXPIRES;
2123 expires = jiffies_to_clock_t(rt_expires);
2124 }
1da177e4 2125 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2126 dev, expires, flags);
1da177e4 2127 }
94e187c0 2128 ip6_rt_put(rt);
1da177e4
LT		 2129 }
2130
2131 /* Try to figure out our local address for this prefix */
2132
2133 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2134 struct inet6_ifaddr *ifp;
1da177e4
LT		 2135 struct in6_addr addr;
2136 int create = 0, update_lft = 0;
2137
2138 if (pinfo->prefix_len == 64) {
2139 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2140
2141 if (!ipv6_addr_any(&in6_dev->token)) {
2142 read_lock_bh(&in6_dev->lock);
2143 memcpy(addr.s6_addr + 8,
2144 in6_dev->token.s6_addr + 8, 8);
2145 read_unlock_bh(&in6_dev->lock);
2146 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2147 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1da177e4
LT		 2148 in6_dev_put(in6_dev);
2149 return;
2150 }
2151 goto ok;
2152 }
e87cc472
JP		 2153 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2154 pinfo->prefix_len);
1da177e4
LT		 2155 in6_dev_put(in6_dev);
2156 return;
2157
2158ok:
2159
53b7997f 2160 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 2161
2162 if (ifp == NULL && valid_lft) {
2163 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2164 u32 addr_flags = 0;
2165
2166#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2167 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2168 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 2169 addr_flags = IFA_F_OPTIMISTIC;
2170#endif
1da177e4
LT		 2171
2172 /* Do not allow to create too much of autoconfigured
2173 * addresses; this would be too easy way to crash kernel.
2174 */
2175 if (!max_addresses ||
2176 ipv6_count_addresses(in6_dev) < max_addresses)
2177 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 2178 addr_type&IPV6_ADDR_SCOPE_MASK,
2179 addr_flags);
1da177e4 2180
3f0d2ba0 2181 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2182 in6_dev_put(in6_dev);
2183 return;
2184 }
2185
2186 update_lft = create = 1;
2187 ifp->cstamp = jiffies;
cf22f9a2 2188 addrconf_dad_start(ifp);
1da177e4
LT		 2189 }
2190
2191 if (ifp) {
2192 int flags;
2193 unsigned long now;
2194#ifdef CONFIG_IPV6_PRIVACY
2195 struct inet6_ifaddr *ift;
2196#endif
2197 u32 stored_lft;
2198
2199 /* update lifetime (RFC2462 5.5.3 e) */
2200 spin_lock(&ifp->lock);
2201 now = jiffies;
2202 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2203 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2204 else
2205 stored_lft = 0;
2206 if (!update_lft && stored_lft) {
2207 if (valid_lft > MIN_VALID_LIFETIME ||
2208 valid_lft > stored_lft)
2209 update_lft = 1;
2210 else if (stored_lft <= MIN_VALID_LIFETIME) {
2211 /* valid_lft <= stored_lft is always true */
a1ed0526
BH		 2212 /*
2213 * RFC 4862 Section 5.5.3e:
2214 * "Note that the preferred lifetime of
2215 * the corresponding address is always
2216 * reset to the Preferred Lifetime in
2217 * the received Prefix Information
2218 * option, regardless of whether the
2219 * valid lifetime is also reset or
2220 * ignored."
2221 *
2222 * So if the preferred lifetime in
2223 * this advertisement is different
2224 * than what we have stored, but the
2225 * valid lifetime is invalid, just
2226 * reset prefered_lft.
2227 *
2228 * We must set the valid lifetime
2229 * to the stored lifetime since we'll
2230 * be updating the timestamp below,
2231 * else we'll set it back to the
25985edc 2232 * minimum.
a1ed0526
BH		 2233 */
2234 if (prefered_lft != ifp->prefered_lft) {
2235 valid_lft = stored_lft;
2236 update_lft = 1;
2237 }
1da177e4
LT		 2238 } else {
2239 valid_lft = MIN_VALID_LIFETIME;
2240 if (valid_lft < prefered_lft)
2241 prefered_lft = valid_lft;
2242 update_lft = 1;
2243 }
2244 }
2245
2246 if (update_lft) {
2247 ifp->valid_lft = valid_lft;
2248 ifp->prefered_lft = prefered_lft;
2249 ifp->tstamp = now;
2250 flags = ifp->flags;
2251 ifp->flags &= ~IFA_F_DEPRECATED;
2252 spin_unlock(&ifp->lock);
2253
2254 if (!(flags&IFA_F_TENTATIVE))
2255 ipv6_ifa_notify(0, ifp);
2256 } else
2257 spin_unlock(&ifp->lock);
2258
2259#ifdef CONFIG_IPV6_PRIVACY
2260 read_lock_bh(&in6_dev->lock);
2261 /* update all temporary addresses in the list */
76f793e3
LC		 2262 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2263 tmp_list) {
2264 int age, max_valid, max_prefered;
2265
c6fbfac2
BB		 2266 if (ifp != ift->ifpub)
2267 continue;
2268
76f793e3
LC		 2269 /*
2270 * RFC 4941 section 3.3:
2271 * If a received option will extend the lifetime
2272 * of a public address, the lifetimes of
2273 * temporary addresses should be extended,
2274 * subject to the overall constraint that no
2275 * temporary addresses should ever remain
2276 * "valid" or "preferred" for a time longer than
2277 * (TEMP_VALID_LIFETIME) or
2278 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2279 * respectively.
2280 */
2281 age = (now - ift->cstamp) / HZ;
2282 max_valid = in6_dev->cnf.temp_valid_lft - age;
2283 if (max_valid < 0)
2284 max_valid = 0;
2285
2286 max_prefered = in6_dev->cnf.temp_prefered_lft -
2287 in6_dev->cnf.max_desync_factor -
2288 age;
2289 if (max_prefered < 0)
2290 max_prefered = 0;
2291
2292 if (valid_lft > max_valid)
2293 valid_lft = max_valid;
2294
2295 if (prefered_lft > max_prefered)
2296 prefered_lft = max_prefered;
2297
1da177e4
LT		 2298 spin_lock(&ift->lock);
2299 flags = ift->flags;
76f793e3
LC		 2300 ift->valid_lft = valid_lft;
2301 ift->prefered_lft = prefered_lft;
2302 ift->tstamp = now;
2303 if (prefered_lft > 0)
2304 ift->flags &= ~IFA_F_DEPRECATED;
2305
1da177e4
LT		 2306 spin_unlock(&ift->lock);
2307 if (!(flags&IFA_F_TENTATIVE))
2308 ipv6_ifa_notify(0, ift);
2309 }
2310
aed65501 2311 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
1da177e4 2312 /*
76f793e3
LC		 2313 * When a new public address is created as
2314 * described in [ADDRCONF], also create a new
2315 * temporary address. Also create a temporary
2316 * address if it's enabled but no temporary
2317 * address currently exists.
1da177e4 2318 */
1ab1457c 2319 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 2320 ipv6_create_tempaddr(ifp, NULL);
2321 } else {
2322 read_unlock_bh(&in6_dev->lock);
2323 }
2324#endif
2325 in6_ifa_put(ifp);
2326 addrconf_verify(0);
2327 }
2328 }
2329 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2330 in6_dev_put(in6_dev);
2331}
2332
2333/*
2334 * Set destination address.
2335 * Special case for SIT interfaces where we create a new "virtual"
2336 * device.
2337 */
af284937 2338int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2339{
2340 struct in6_ifreq ireq;
2341 struct net_device *dev;
2342 int err = -EINVAL;
2343
2344 rtnl_lock();
2345
2346 err = -EFAULT;
2347 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2348 goto err_exit;
2349
af284937 2350 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2351
2352 err = -ENODEV;
2353 if (dev == NULL)
2354 goto err_exit;
2355
07a93626 2356#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2357 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2358 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2359 struct ifreq ifr;
1da177e4
LT		 2360 struct ip_tunnel_parm p;
2361
2362 err = -EADDRNOTAVAIL;
2363 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2364 goto err_exit;
2365
2366 memset(&p, 0, sizeof(p));
2367 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2368 p.iph.saddr = 0;
2369 p.iph.version = 4;
2370 p.iph.ihl = 5;
2371 p.iph.protocol = IPPROTO_IPV6;
2372 p.iph.ttl = 64;
d20b3109 2373 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2374
5bc3eb7e
SH		 2375 if (ops->ndo_do_ioctl) {
2376 mm_segment_t oldfs = get_fs();
2377
2378 set_fs(KERNEL_DS);
2379 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2380 set_fs(oldfs);
2381 } else
2382 err = -EOPNOTSUPP;
1da177e4
LT		 2383
2384 if (err == 0) {
2385 err = -ENOBUFS;
af284937
DL		 2386 dev = __dev_get_by_name(net, p.name);
2387 if (!dev)
1da177e4
LT		 2388 goto err_exit;
2389 err = dev_open(dev);
2390 }
2391 }
0be669bb 2392#endif
1da177e4
LT		 2393
2394err_exit:
2395 rtnl_unlock();
2396 return err;
2397}
2398
2399/*
2400 * Manual configuration of address on an interface
2401 */
b71d1d42 2402static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2403 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2404 __u32 valid_lft)
1da177e4
LT		 2405{
2406 struct inet6_ifaddr *ifp;
2407 struct inet6_dev *idev;
2408 struct net_device *dev;
2409 int scope;
6f704992
YH		 2410 u32 flags;
2411 clock_t expires;
4bed72e4 2412 unsigned long timeout;
1da177e4
LT		 2413
2414 ASSERT_RTNL();
1ab1457c 2415
24ef0da7
TG		 2416 if (plen > 128)
2417 return -EINVAL;
2418
0778769d
NT		 2419 /* check the lifetime */
2420 if (!valid_lft || prefered_lft > valid_lft)
2421 return -EINVAL;
2422
af284937
DL		 2423 dev = __dev_get_by_index(net, ifindex);
2424 if (!dev)
1da177e4 2425 return -ENODEV;
1ab1457c 2426
64e724f6
BH		 2427 idev = addrconf_add_dev(dev);
2428 if (IS_ERR(idev))
2429 return PTR_ERR(idev);
1da177e4
LT		 2430
2431 scope = ipv6_addr_scope(pfx);
2432
4bed72e4
YH		 2433 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2434 if (addrconf_finite_timeout(timeout)) {
2435 expires = jiffies_to_clock_t(timeout * HZ);
2436 valid_lft = timeout;
6f704992 2437 flags = RTF_EXPIRES;
4bed72e4
YH		 2438 } else {
2439 expires = 0;
2440 flags = 0;
2441 ifa_flags |= IFA_F_PERMANENT;
6f704992 2442 }
0778769d 2443
4bed72e4
YH		 2444 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2445 if (addrconf_finite_timeout(timeout)) {
2446 if (timeout == 0)
2447 ifa_flags |= IFA_F_DEPRECATED;
2448 prefered_lft = timeout;
2449 }
0778769d
NT		 2450
2451 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2452
1da177e4 2453 if (!IS_ERR(ifp)) {
06aebfb7 2454 spin_lock_bh(&ifp->lock);
0778769d
NT		 2455 ifp->valid_lft = valid_lft;
2456 ifp->prefered_lft = prefered_lft;
2457 ifp->tstamp = jiffies;
06aebfb7 2458 spin_unlock_bh(&ifp->lock);
0778769d 2459
46d48046 2460 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2461 expires, flags);
95c385b4
NH		 2462 /*
2463 * Note that section 3.1 of RFC 4429 indicates
2464 * that the Optimistic flag should not be set for
2465 * manually configured addresses
2466 */
cf22f9a2 2467 addrconf_dad_start(ifp);
1da177e4 2468 in6_ifa_put(ifp);
0778769d 2469 addrconf_verify(0);
1da177e4
LT		 2470 return 0;
2471 }
2472
2473 return PTR_ERR(ifp);
2474}
2475
b71d1d42 2476static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2477 unsigned int plen)
1da177e4
LT		 2478{
2479 struct inet6_ifaddr *ifp;
2480 struct inet6_dev *idev;
2481 struct net_device *dev;
1ab1457c 2482
24ef0da7
TG		 2483 if (plen > 128)
2484 return -EINVAL;
2485
af284937
DL		 2486 dev = __dev_get_by_index(net, ifindex);
2487 if (!dev)
1da177e4
LT		 2488 return -ENODEV;
2489
2490 if ((idev = __in6_dev_get(dev)) == NULL)
2491 return -ENXIO;
2492
2493 read_lock_bh(&idev->lock);
502a2ffd 2494 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2495 if (ifp->prefix_len == plen &&
2496 ipv6_addr_equal(pfx, &ifp->addr)) {
2497 in6_ifa_hold(ifp);
2498 read_unlock_bh(&idev->lock);
1ab1457c 2499
1da177e4
LT		 2500 ipv6_del_addr(ifp);
2501
2502 /* If the last address is deleted administratively,
2503 disable IPv6 on this interface.
2504 */
502a2ffd 2505 if (list_empty(&idev->addr_list))
1da177e4
LT		 2506 addrconf_ifdown(idev->dev, 1);
2507 return 0;
2508 }
2509 }
2510 read_unlock_bh(&idev->lock);
2511 return -EADDRNOTAVAIL;
2512}
2513
2514
af284937 2515int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2516{
2517 struct in6_ifreq ireq;
2518 int err;
1ab1457c 2519
af31f412 2520 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2521 return -EPERM;
1ab1457c 2522
1da177e4
LT		 2523 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2524 return -EFAULT;
2525
2526 rtnl_lock();
af284937
DL		 2527 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2528 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2529 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2530 rtnl_unlock();
2531 return err;
2532}
2533
af284937 2534int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2535{
2536 struct in6_ifreq ireq;
2537 int err;
1ab1457c 2538
af31f412 2539 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2540 return -EPERM;
2541
2542 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2543 return -EFAULT;
2544
2545 rtnl_lock();
af284937
DL		 2546 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2547 ireq.ifr6_prefixlen);
1da177e4
LT		 2548 rtnl_unlock();
2549 return err;
2550}
2551
b5f348e5
IJ		 2552static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2553 int plen, int scope)
2554{
2555 struct inet6_ifaddr *ifp;
2556
2557 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2558 if (!IS_ERR(ifp)) {
2559 spin_lock_bh(&ifp->lock);
2560 ifp->flags &= ~IFA_F_TENTATIVE;
2561 spin_unlock_bh(&ifp->lock);
2562 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2563 in6_ifa_put(ifp);
2564 }
2565}
2566
07a93626 2567#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2568static void sit_add_v4_addrs(struct inet6_dev *idev)
2569{
1da177e4
LT		 2570 struct in6_addr addr;
2571 struct net_device *dev;
c346dca1 2572 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2573 int scope;
2574
2575 ASSERT_RTNL();
2576
2577 memset(&addr, 0, sizeof(struct in6_addr));
2578 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2579
2580 if (idev->dev->flags&IFF_POINTOPOINT) {
2581 addr.s6_addr32[0] = htonl(0xfe800000);
2582 scope = IFA_LINK;
2583 } else {
2584 scope = IPV6_ADDR_COMPATv4;
2585 }
2586
2587 if (addr.s6_addr32[3]) {
b5f348e5 2588 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2589 return;
2590 }
2591
6fda7350 2592 for_each_netdev(net, dev) {
8e5e8f30 2593 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2594 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2595 struct in_ifaddr *ifa;
1da177e4
LT		 2596
2597 int flag = scope;
2598
2599 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2600 int plen;
2601
2602 addr.s6_addr32[3] = ifa->ifa_local;
2603
2604 if (ifa->ifa_scope == RT_SCOPE_LINK)
2605 continue;
2606 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2607 if (idev->dev->flags&IFF_POINTOPOINT)
2608 continue;
2609 flag |= IFA_HOST;
2610 }
2611 if (idev->dev->flags&IFF_POINTOPOINT)
2612 plen = 64;
2613 else
2614 plen = 96;
2615
b5f348e5 2616 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2617 }
2618 }
1ab1457c 2619 }
1da177e4 2620}
0be669bb 2621#endif
1da177e4
LT		 2622
2623static void init_loopback(struct net_device *dev)
2624{
2625 struct inet6_dev *idev;
25fb6ca4
BK		 2626 struct net_device *sp_dev;
2627 struct inet6_ifaddr *sp_ifa;
2628 struct rt6_info *sp_rt;
1da177e4
LT		 2629
2630 /* ::1 */
2631
2632 ASSERT_RTNL();
2633
2634 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2635 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2636 return;
2637 }
2638
b5f348e5 2639 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2640
2641 /* Add routes to other interface's IPv6 addresses */
2642 for_each_netdev(dev_net(dev), sp_dev) {
2643 if (!strcmp(sp_dev->name, dev->name))
2644 continue;
2645
2646 idev = __in6_dev_get(sp_dev);
2647 if (!idev)
2648 continue;
2649
2650 read_lock_bh(&idev->lock);
2651 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2652
2653 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2654 continue;
2655
2656 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
2657
2658 /* Failure cases are ignored */
2659 if (!IS_ERR(sp_rt))
2660 ip6_ins_rt(sp_rt);
2661 }
2662 read_unlock_bh(&idev->lock);
2663 }
1da177e4
LT		 2664}
2665
b71d1d42 2666static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4 2667{
8e5e8f30 2668 struct inet6_ifaddr *ifp;
95c385b4
NH		 2669 u32 addr_flags = IFA_F_PERMANENT;
2670
2671#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2672 if (idev->cnf.optimistic_dad &&
702beb87 2673 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2674 addr_flags |= IFA_F_OPTIMISTIC;
2675#endif
1da177e4 2676
95c385b4
NH		 2677
2678 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2679 if (!IS_ERR(ifp)) {
46d48046 2680 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2681 addrconf_dad_start(ifp);
1da177e4
LT		 2682 in6_ifa_put(ifp);
2683 }
2684}
2685
2686static void addrconf_dev_config(struct net_device *dev)
2687{
2688 struct in6_addr addr;
8e5e8f30 2689 struct inet6_dev *idev;
1da177e4
LT		 2690
2691 ASSERT_RTNL();
2692
74235a25
HX		 2693 if ((dev->type != ARPHRD_ETHER) &&
2694 (dev->type != ARPHRD_FDDI) &&
74235a25 2695 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 2696 (dev->type != ARPHRD_INFINIBAND) &&
cb6bf355
YH		 2697 (dev->type != ARPHRD_IEEE802154) &&
2698 (dev->type != ARPHRD_IEEE1394)) {
74235a25
HX		 2699 /* Alas, we support only Ethernet autoconfiguration. */
2700 return;
2701 }
2702
1da177e4 2703 idev = addrconf_add_dev(dev);
64e724f6 2704 if (IS_ERR(idev))
1da177e4
LT		 2705 return;
2706
2707 memset(&addr, 0, sizeof(struct in6_addr));
2708 addr.s6_addr32[0] = htonl(0xFE800000);
2709
2710 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2711 addrconf_add_linklocal(idev, &addr);
2712}
2713
07a93626 2714#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2715static void addrconf_sit_config(struct net_device *dev)
2716{
2717 struct inet6_dev *idev;
2718
2719 ASSERT_RTNL();
2720
1ab1457c
YH		 2721 /*
2722 * Configure the tunnel with one of our IPv4
2723 * addresses... we should configure all of
1da177e4
LT		 2724 * our v4 addrs in the tunnel
2725 */
2726
2727 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2728 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2729 return;
2730 }
2731
c7dc89c0
FT		 2732 if (dev->priv_flags & IFF_ISATAP) {
2733 struct in6_addr addr;
2734
2735 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2736 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2737 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2738 addrconf_add_linklocal(idev, &addr);
2739 return;
2740 }
2741
1da177e4
LT		 2742 sit_add_v4_addrs(idev);
2743
62b54dd9 2744 if (dev->flags&IFF_POINTOPOINT)
1da177e4 2745 addrconf_add_mroute(dev);
62b54dd9 2746 else
1da177e4
LT		 2747 sit_route_add(dev);
2748}
0be669bb 2749#endif
1da177e4 2750
07a93626 2751#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2752static void addrconf_gre_config(struct net_device *dev)
2753{
2754 struct inet6_dev *idev;
2755 struct in6_addr addr;
2756
f3213831 2757 pr_info("%s(%s)\n", __func__, dev->name);
aee80b54 2758
2759 ASSERT_RTNL();
2760
2761 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2762 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 2763 return;
2764 }
2765
2766 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2767 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2768
2769 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2770 addrconf_add_linklocal(idev, &addr);
2771}
2772#endif
2773
1da177e4
LT		 2774static inline int
2775ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2776{
2777 struct in6_addr lladdr;
2778
95c385b4 2779 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2780 addrconf_add_linklocal(idev, &lladdr);
2781 return 0;
2782 }
2783 return -1;
2784}
2785
2786static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2787{
2788 struct net_device *link_dev;
c346dca1 2789 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2790
2791 /* first try to inherit the link-local address from the link device */
2792 if (idev->dev->iflink &&
6fda7350 2793 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2794 if (!ipv6_inherit_linklocal(idev, link_dev))
2795 return;
2796 }
2797 /* then try to inherit it from any device */
6fda7350 2798 for_each_netdev(net, link_dev) {
1da177e4
LT		 2799 if (!ipv6_inherit_linklocal(idev, link_dev))
2800 return;
2801 }
91df42be 2802 pr_debug("init ip6-ip6: add_linklocal failed\n");
1da177e4
LT		 2803}
2804
2805/*
2806 * Autoconfigure tunnel with a link-local address so routing protocols,
2807 * DHCPv6, MLD etc. can be run over the virtual link
2808 */
2809
2810static void addrconf_ip6_tnl_config(struct net_device *dev)
2811{
2812 struct inet6_dev *idev;
2813
2814 ASSERT_RTNL();
2815
e21e8467 2816 idev = addrconf_add_dev(dev);
64e724f6 2817 if (IS_ERR(idev)) {
91df42be 2818 pr_debug("init ip6-ip6: add_dev failed\n");
1da177e4
LT		 2819 return;
2820 }
2821 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2822}
2823
1ab1457c 2824static int addrconf_notify(struct notifier_block *this, unsigned long event,
8e5e8f30 2825 void *data)
1da177e4
LT		 2826{
2827 struct net_device *dev = (struct net_device *) data;
748e2d93 2828 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2829 int run_pending = 0;
b217d616 2830 int err;
1da177e4 2831
e21e8467 2832 switch (event) {
45ba9dd2 2833 case NETDEV_REGISTER:
74235a25 2834 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2835 idev = ipv6_add_dev(dev);
2836 if (!idev)
b217d616 2837 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2838 }
2839 break;
bcdd553f 2840
1da177e4 2841 case NETDEV_UP:
3c21edbd 2842 case NETDEV_CHANGE:
c2edacf8
JV		 2843 if (dev->flags & IFF_SLAVE)
2844 break;
2845
3c21edbd 2846 if (event == NETDEV_UP) {
f24e3d65 2847 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 2848 /* device is not ready yet. */
f3213831 2849 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 2850 dev->name);
2851 break;
2852 }
99081049 2853
d31c7b8f
EP		 2854 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2855 idev = ipv6_add_dev(dev);
2856
e3ec6cfc 2857 if (idev) {
99081049 2858 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2859 run_pending = 1;
2860 }
3c21edbd 2861 } else {
f24e3d65 2862 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2863 /* device is still not ready. */
2864 break;
2865 }
2866
2867 if (idev) {
bcdd553f 2868 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2869 /* device is already configured. */
2870 break;
3c21edbd
YH		 2871 idev->if_flags |= IF_READY;
2872 }
2873
f3213831
JP		 2874 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2875 dev->name);
3c21edbd 2876
c5e33bdd 2877 run_pending = 1;
3c21edbd
YH		 2878 }
2879
e21e8467 2880 switch (dev->type) {
07a93626 2881#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2882 case ARPHRD_SIT:
2883 addrconf_sit_config(dev);
2884 break;
aee80b54 2885#endif
07a93626 2886#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2887 case ARPHRD_IPGRE:
2888 addrconf_gre_config(dev);
2889 break;
0be669bb 2890#endif
1da177e4
LT		 2891 case ARPHRD_TUNNEL6:
2892 addrconf_ip6_tnl_config(dev);
2893 break;
2894 case ARPHRD_LOOPBACK:
2895 init_loopback(dev);
2896 break;
2897
2898 default:
2899 addrconf_dev_config(dev);
2900 break;
3ff50b79 2901 }
bcdd553f 2902
1da177e4 2903 if (idev) {
c5e33bdd
YH		 2904 if (run_pending)
2905 addrconf_dad_run(idev);
2906
bcdd553f
SH		 2907 /*
2908 * If the MTU changed during the interface down,
2909 * when the interface up, the changed MTU must be
2910 * reflected in the idev as well as routers.
1da177e4 2911 */
bcdd553f
SH		 2912 if (idev->cnf.mtu6 != dev->mtu &&
2913 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2914 rt6_mtu_change(dev, dev->mtu);
2915 idev->cnf.mtu6 = dev->mtu;
2916 }
2917 idev->tstamp = jiffies;
2918 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2919
2920 /*
2921 * If the changed mtu during down is lower than
2922 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2923 */
2924 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2925 addrconf_ifdown(dev, 1);
1da177e4
LT		 2926 }
2927 break;
2928
2929 case NETDEV_CHANGEMTU:
d31c7b8f 2930 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2931 rt6_mtu_change(dev, dev->mtu);
2932 idev->cnf.mtu6 = dev->mtu;
2933 break;
2934 }
2935
d31c7b8f
EP		 2936 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2937 idev = ipv6_add_dev(dev);
2938 if (idev)
2939 break;
2940 }
2941
bcdd553f
SH		 2942 /*
2943 * MTU falled under IPV6_MIN_MTU.
2944 * Stop IPv6 on this interface.
2945 */
1da177e4
LT		 2946
2947 case NETDEV_DOWN:
2948 case NETDEV_UNREGISTER:
2949 /*
2950 * Remove all addresses from this interface.
2951 */
2952 addrconf_ifdown(dev, event != NETDEV_DOWN);
2953 break;
3c21edbd 2954
1da177e4 2955 case NETDEV_CHANGENAME:
1da177e4 2956 if (idev) {
5632c515 2957 snmp6_unregister_dev(idev);
408c4768 2958 addrconf_sysctl_unregister(idev);
f52295a9 2959 addrconf_sysctl_register(idev);
b217d616
HX		 2960 err = snmp6_register_dev(idev);
2961 if (err)
2962 return notifier_from_errno(err);
5632c515 2963 }
1da177e4 2964 break;
bcdd553f 2965
93d9b7d7
JP		 2966 case NETDEV_PRE_TYPE_CHANGE:
2967 case NETDEV_POST_TYPE_CHANGE:
2968 addrconf_type_change(dev, event);
75c78500 2969 break;
3ff50b79 2970 }
1da177e4
LT		 2971
2972 return NOTIFY_OK;
2973}
2974
2975/*
2976 * addrconf module should be notified of a device going up
2977 */
2978static struct notifier_block ipv6_dev_notf = {
2979 .notifier_call = addrconf_notify,
1da177e4
LT		 2980};
2981
93d9b7d7 2982static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2983{
2984 struct inet6_dev *idev;
2985 ASSERT_RTNL();
2986
2987 idev = __in6_dev_get(dev);
2988
93d9b7d7 2989 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2990 ipv6_mc_remap(idev);
93d9b7d7 2991 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2992 ipv6_mc_unmap(idev);
2993}
2994
1da177e4
LT		 2995static int addrconf_ifdown(struct net_device *dev, int how)
2996{
c346dca1 2997 struct net *net = dev_net(dev);
502a2ffd 2998 struct inet6_dev *idev;
2999 struct inet6_ifaddr *ifa;
73a8bd74 3000 int state, i;
1da177e4
LT		 3001
3002 ASSERT_RTNL();
3003
73a8bd74
DM		 3004 rt6_ifdown(net, dev);
3005 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3006
3007 idev = __in6_dev_get(dev);
3008 if (idev == NULL)
3009 return -ENODEV;
3010
bcdd553f
SH		 3011 /*
3012 * Step 1: remove reference to ipv6 device from parent device.
3013 * Do not dev_put!
1da177e4 3014 */
439e2385 3015 if (how) {
1da177e4 3016 idev->dead = 1;
8814c4b5
YH		 3017
3018 /* protected by rtnl_lock */
a9b3cd7f 3019 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3020
3021 /* Step 1.5: remove snmp6 entry */
3022 snmp6_unregister_dev(idev);
3023
3024 }
3025
73a8bd74
DM		 3026 /* Step 2: clear hash table */
3027 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3028 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3029
3030 spin_lock_bh(&addrconf_hash_lock);
3031 restart:
b67bfe0d 3032 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74
DM		 3033 if (ifa->idev == idev) {
3034 hlist_del_init_rcu(&ifa->addr_lst);
3035 addrconf_del_timer(ifa);
3036 goto restart;
3037 }
3038 }
3039 spin_unlock_bh(&addrconf_hash_lock);
3040 }
3041
1da177e4
LT		 3042 write_lock_bh(&idev->lock);
3043
bcdd553f 3044 /* Step 2: clear flags for stateless addrconf */
439e2385 3045 if (!how)
3c21edbd 3046 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3047
1da177e4 3048#ifdef CONFIG_IPV6_PRIVACY
439e2385 3049 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 3050 in6_dev_put(idev);
3051
bcdd553f 3052 /* Step 3: clear tempaddr list */
372e6c8f 3053 while (!list_empty(&idev->tempaddr_list)) {
3054 ifa = list_first_entry(&idev->tempaddr_list,
3055 struct inet6_ifaddr, tmp_list);
3056 list_del(&ifa->tmp_list);
1da177e4
LT		 3057 write_unlock_bh(&idev->lock);
3058 spin_lock_bh(&ifa->lock);
3059
3060 if (ifa->ifpub) {
3061 in6_ifa_put(ifa->ifpub);
3062 ifa->ifpub = NULL;
3063 }
3064 spin_unlock_bh(&ifa->lock);
3065 in6_ifa_put(ifa);
3066 write_lock_bh(&idev->lock);
3067 }
3068#endif
8f37ada5 3069
502a2ffd 3070 while (!list_empty(&idev->addr_list)) {
3071 ifa = list_first_entry(&idev->addr_list,
3072 struct inet6_ifaddr, if_list);
84e8b803 3073 addrconf_del_timer(ifa);
3074
73a8bd74 3075 list_del(&ifa->if_list);
84e8b803 3076
73a8bd74 3077 write_unlock_bh(&idev->lock);
84e8b803 3078
73a8bd74
DM		 3079 spin_lock_bh(&ifa->state_lock);
3080 state = ifa->state;
3081 ifa->state = INET6_IFADDR_STATE_DEAD;
3082 spin_unlock_bh(&ifa->state_lock);
9d82ca98 3083
73a8bd74
DM		 3084 if (state != INET6_IFADDR_STATE_DEAD) {
3085 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3086 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
27bdb2ab 3087 }
73a8bd74 3088 in6_ifa_put(ifa);
8f37ada5 3089
73a8bd74
DM		 3090 write_lock_bh(&idev->lock);
3091 }
8f37ada5 3092
1da177e4
LT		 3093 write_unlock_bh(&idev->lock);
3094
3095 /* Step 5: Discard multicast list */
439e2385 3096 if (how)
1da177e4
LT		 3097 ipv6_mc_destroy_dev(idev);
3098 else
3099 ipv6_mc_down(idev);
3100
1da177e4 3101 idev->tstamp = jiffies;
1ab1457c 3102
bcdd553f 3103 /* Last: Shot the device (if unregistered) */
439e2385 3104 if (how) {
408c4768 3105 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3106 neigh_parms_release(&nd_tbl, idev->nd_parms);
3107 neigh_ifdown(&nd_tbl, dev);
3108 in6_dev_put(idev);
3109 }
3110 return 0;
3111}
3112
3113static void addrconf_rs_timer(unsigned long data)
3114{
3115 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
5b2a1953 3116 struct inet6_dev *idev = ifp->idev;
1da177e4 3117
5b2a1953 3118 read_lock(&idev->lock);
3119 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3120 goto out;
3121
9ba2add3 3122 if (!ipv6_accept_ra(idev))
5b2a1953 3123 goto out;
3124
3125 /* Announcement received after solicitation was sent */
3126 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3127 goto out;
1da177e4
LT		 3128
3129 spin_lock(&ifp->lock);
5b2a1953 3130 if (ifp->probes++ < idev->cnf.rtr_solicits) {
1da177e4
LT		 3131 /* The wait after the last probe can be shorter */
3132 addrconf_mod_timer(ifp, AC_RS,
5b2a1953 3133 (ifp->probes == idev->cnf.rtr_solicits) ?
3134 idev->cnf.rtr_solicit_delay :
3135 idev->cnf.rtr_solicit_interval);
1da177e4
LT		 3136 spin_unlock(&ifp->lock);
3137
5b2a1953 3138 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 3139 } else {
3140 spin_unlock(&ifp->lock);
3141 /*
3142 * Note: we do not support deprecated "all on-link"
3143 * assumption any longer.
3144 */
91df42be 3145 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3146 }
3147
3148out:
5b2a1953 3149 read_unlock(&idev->lock);
1da177e4
LT		 3150 in6_ifa_put(ifp);
3151}
3152
3153/*
3154 * Duplicate Address Detection
3155 */
3c21edbd
YH		 3156static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3157{
3158 unsigned long rand_num;
3159 struct inet6_dev *idev = ifp->idev;
3160
95c385b4
NH		 3161 if (ifp->flags & IFA_F_OPTIMISTIC)
3162 rand_num = 0;
3163 else
3164 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3165
3c21edbd
YH		 3166 ifp->probes = idev->cnf.dad_transmits;
3167 addrconf_mod_timer(ifp, AC_DAD, rand_num);
3168}
3169
cf22f9a2 3170static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4
LT		 3171{
3172 struct inet6_dev *idev = ifp->idev;
3173 struct net_device *dev = idev->dev;
1da177e4
LT		 3174
3175 addrconf_join_solict(dev, &ifp->addr);
3176
1da177e4 3177 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 3178
3179 read_lock_bh(&idev->lock);
622ccdf1 3180 spin_lock(&ifp->lock);
e9d3e084 3181 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3182 goto out;
1da177e4
LT		 3183
3184 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3185 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3186 !(ifp->flags&IFA_F_TENTATIVE) ||
3187 ifp->flags & IFA_F_NODAD) {
cc411d0b 3188 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3189 spin_unlock(&ifp->lock);
1da177e4
LT		 3190 read_unlock_bh(&idev->lock);
3191
3192 addrconf_dad_completed(ifp);
3193 return;
3194 }
3195
6732bade 3196 if (!(idev->if_flags & IF_READY)) {
21809faf 3197 spin_unlock(&ifp->lock);
6732bade 3198 read_unlock_bh(&idev->lock);
3c21edbd 3199 /*
590a9887 3200 * If the device is not ready:
3c21edbd
YH		 3201 * - keep it tentative if it is a permanent address.
3202 * - otherwise, kill it.
3203 */
3204 in6_ifa_hold(ifp);
cc411d0b 3205 addrconf_dad_stop(ifp, 0);
6732bade 3206 return;
3c21edbd 3207 }
95c385b4
NH		 3208
3209 /*
3210 * Optimistic nodes can start receiving
3211 * Frames right away
3212 */
e21e8467 3213 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 3214 ip6_ins_rt(ifp->rt);
3215
6732bade 3216 addrconf_dad_kick(ifp);
1da177e4 3217out:
622ccdf1 3218 spin_unlock(&ifp->lock);
1da177e4
LT		 3219 read_unlock_bh(&idev->lock);
3220}
3221
3222static void addrconf_dad_timer(unsigned long data)
3223{
3224 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3225 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3226 struct in6_addr mcaddr;
3227
f2344a13
HX		 3228 if (!ifp->probes && addrconf_dad_end(ifp))
3229 goto out;
3230
122e4519 3231 read_lock(&idev->lock);
3232 if (idev->dead || !(idev->if_flags & IF_READY)) {
3233 read_unlock(&idev->lock);
1da177e4
LT		 3234 goto out;
3235 }
21809faf 3236
3237 spin_lock(&ifp->lock);
622ccdf1
HX		 3238 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3239 spin_unlock(&ifp->lock);
3240 read_unlock(&idev->lock);
3241 goto out;
3242 }
3243
1da177e4
LT		 3244 if (ifp->probes == 0) {
3245 /*
3246 * DAD was successful
3247 */
3248
cc411d0b 3249 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3250 spin_unlock(&ifp->lock);
122e4519 3251 read_unlock(&idev->lock);
1da177e4
LT		 3252
3253 addrconf_dad_completed(ifp);
3254
3255 goto out;
3256 }
3257
3258 ifp->probes--;
3259 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
21809faf 3260 spin_unlock(&ifp->lock);
122e4519 3261 read_unlock(&idev->lock);
1da177e4
LT		 3262
3263 /* send a neighbour solicitation for our addr */
1da177e4 3264 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3265 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3266out:
3267 in6_ifa_put(ifp);
3268}
3269
3270static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3271{
e21e8467 3272 struct net_device *dev = ifp->idev->dev;
1da177e4
LT		 3273
3274 /*
3275 * Configure the address for reception. Now it is valid.
3276 */
3277
3278 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3279
026359bc
TA		 3280 /* If added prefix is link local and we are prepared to process
3281 router advertisements, start sending router solicitations.
1da177e4
LT		 3282 */
3283
aeaf6e9d 3284 if (ipv6_accept_ra(ifp->idev) &&
1da177e4
LT		 3285 ifp->idev->cnf.rtr_solicits > 0 &&
3286 (dev->flags&IFF_LOOPBACK) == 0 &&
3287 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 3288 /*
3289 * If a host as already performed a random delay
3290 * [...] as part of DAD [...] there is no need
3291 * to delay again before sending the first RS
3292 */
f3ee4010 3293 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 3294
3295 spin_lock_bh(&ifp->lock);
3296 ifp->probes = 1;
3297 ifp->idev->if_flags |= IF_RS_SENT;
3298 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3299 spin_unlock_bh(&ifp->lock);
3300 }
3301}
3302
e21e8467
SH		 3303static void addrconf_dad_run(struct inet6_dev *idev)
3304{
c5e33bdd
YH		 3305 struct inet6_ifaddr *ifp;
3306
3307 read_lock_bh(&idev->lock);
502a2ffd 3308 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3309 spin_lock(&ifp->lock);
f2344a13
HX		 3310 if (ifp->flags & IFA_F_TENTATIVE &&
3311 ifp->state == INET6_IFADDR_STATE_DAD)
3312 addrconf_dad_kick(ifp);
21809faf 3313 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3314 }
3315 read_unlock_bh(&idev->lock);
3316}
3317
1da177e4
LT		 3318#ifdef CONFIG_PROC_FS
3319struct if6_iter_state {
3c40090a 3320 struct seq_net_private p;
1da177e4 3321 int bucket;
1d578303 3322 int offset;
1da177e4
LT		 3323};
3324
1d578303 3325static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3326{
3327 struct inet6_ifaddr *ifa = NULL;
3328 struct if6_iter_state *state = seq->private;
1218854a 3329 struct net *net = seq_file_net(seq);
1d578303 3330 int p = 0;
1da177e4 3331
1d578303
MM		 3332 /* initial bucket if pos is 0 */
3333 if (pos == 0) {
3334 state->bucket = 0;
3335 state->offset = 0;
3336 }
3337
3338 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3339 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3340 addr_lst) {
9f0d3c27
ED		 3341 if (!net_eq(dev_net(ifa->idev->dev), net))
3342 continue;
1d578303
MM		 3343 /* sync with offset */
3344 if (p < state->offset) {
3345 p++;
3346 continue;
3347 }
3348 state->offset++;
9f0d3c27 3349 return ifa;
1d578303
MM		 3350 }
3351
3352 /* prepare for next bucket */
3353 state->offset = 0;
3354 p = 0;
1da177e4 3355 }
c2e21293 3356 return NULL;
1da177e4
LT		 3357}
3358
c2e21293 3359static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3360 struct inet6_ifaddr *ifa)
1da177e4
LT		 3361{
3362 struct if6_iter_state *state = seq->private;
1218854a 3363 struct net *net = seq_file_net(seq);
1da177e4 3364
b67bfe0d 3365 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3366 if (!net_eq(dev_net(ifa->idev->dev), net))
3367 continue;
1d578303 3368 state->offset++;
9f0d3c27 3369 return ifa;
1d578303 3370 }
3c40090a 3371
c2e21293 3372 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3373 state->offset = 0;
b67bfe0d 3374 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3375 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3376 if (!net_eq(dev_net(ifa->idev->dev), net))
3377 continue;
1d578303 3378 state->offset++;
9f0d3c27 3379 return ifa;
c2e21293 3380 }
1da177e4 3381 }
3c40090a 3382
c2e21293 3383 return NULL;
1da177e4
LT		 3384}
3385
1da177e4 3386static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3387 __acquires(rcu_bh)
1da177e4 3388{
5c578aed 3389 rcu_read_lock_bh();
1d578303 3390 return if6_get_first(seq, *pos);
1da177e4
LT		 3391}
3392
3393static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3394{
3395 struct inet6_ifaddr *ifa;
3396
3397 ifa = if6_get_next(seq, v);
3398 ++*pos;
3399 return ifa;
3400}
3401
3402static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3403 __releases(rcu_bh)
1da177e4 3404{
5c578aed 3405 rcu_read_unlock_bh();
1da177e4
LT		 3406}
3407
3408static int if6_seq_show(struct seq_file *seq, void *v)
3409{
3410 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3411 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3412 &ifp->addr,
1da177e4
LT		 3413 ifp->idev->dev->ifindex,
3414 ifp->prefix_len,
3415 ifp->scope,
3416 ifp->flags,
3417 ifp->idev->dev->name);
3418 return 0;
3419}
3420
56b3d975 3421static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3422 .start = if6_seq_start,
3423 .next = if6_seq_next,
3424 .show = if6_seq_show,
3425 .stop = if6_seq_stop,
3426};
3427
3428static int if6_seq_open(struct inode *inode, struct file *file)
3429{
3c40090a
DL		 3430 return seq_open_net(inode, file, &if6_seq_ops,
3431 sizeof(struct if6_iter_state));
1da177e4
LT		 3432}
3433
9a32144e 3434static const struct file_operations if6_fops = {
1da177e4
LT		 3435 .owner = THIS_MODULE,
3436 .open = if6_seq_open,
3437 .read = seq_read,
3438 .llseek = seq_lseek,
3c40090a 3439 .release = seq_release_net,
1da177e4
LT		 3440};
3441
2c8c1e72 3442static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3443{
d4beaa66 3444 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 3445 return -ENOMEM;
3446 return 0;
3447}
3448
2c8c1e72 3449static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 3450{
ece31ffd 3451 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 3452}
3453
3454static struct pernet_operations if6_proc_net_ops = {
3455 .init = if6_proc_net_init,
3456 .exit = if6_proc_net_exit,
3457};
3458
3459int __init if6_proc_init(void)
3460{
3461 return register_pernet_subsys(&if6_proc_net_ops);
3462}
3463
1da177e4
LT		 3464void if6_proc_exit(void)
3465{
3c40090a 3466 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3467}
3468#endif /* CONFIG_PROC_FS */
3469
07a93626 3470#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3471/* Check if address is a home address configured on any interface. */
b71d1d42 3472int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3473{
3474 int ret = 0;
c2e21293 3475 struct inet6_ifaddr *ifp = NULL;
ddbe5032 3476 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3477
5c578aed 3478 rcu_read_lock_bh();
b67bfe0d 3479 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 3480 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3481 continue;
caad295f 3482 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3483 (ifp->flags & IFA_F_HOMEADDRESS)) {
3484 ret = 1;
3485 break;
3486 }
3487 }
5c578aed 3488 rcu_read_unlock_bh();
3b9f9a1c
NT		 3489 return ret;
3490}
3491#endif
3492
1da177e4
LT		 3493/*
3494 * Periodic address status verification
3495 */
3496
3497static void addrconf_verify(unsigned long foo)
3498{
b2db7564 3499 unsigned long now, next, next_sec, next_sched;
1da177e4 3500 struct inet6_ifaddr *ifp;
1da177e4
LT		 3501 int i;
3502
5c578aed 3503 rcu_read_lock_bh();
3504 spin_lock(&addrconf_verify_lock);
1da177e4 3505 now = jiffies;
b2db7564 3506 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4
LT		 3507
3508 del_timer(&addr_chk_timer);
3509
bcdd553f 3510 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3511restart:
b67bfe0d 3512 hlist_for_each_entry_rcu_bh(ifp,
5c578aed 3513 &inet6_addr_lst[i], addr_lst) {
1da177e4 3514 unsigned long age;
1da177e4
LT		 3515
3516 if (ifp->flags & IFA_F_PERMANENT)
3517 continue;
3518
3519 spin_lock(&ifp->lock);
b2db7564
YH		 3520 /* We try to batch several events at once. */
3521 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3522
8f27ebb9
YH		 3523 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3524 age >= ifp->valid_lft) {
1da177e4
LT		 3525 spin_unlock(&ifp->lock);
3526 in6_ifa_hold(ifp);
1da177e4
LT		 3527 ipv6_del_addr(ifp);
3528 goto restart;
8f27ebb9
YH		 3529 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3530 spin_unlock(&ifp->lock);
3531 continue;
1da177e4 3532 } else if (age >= ifp->prefered_lft) {
a1ed0526 3533 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3534 int deprecate = 0;
3535
3536 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3537 deprecate = 1;
3538 ifp->flags |= IFA_F_DEPRECATED;
3539 }
3540
3541 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3542 next = ifp->tstamp + ifp->valid_lft * HZ;
3543
3544 spin_unlock(&ifp->lock);
3545
3546 if (deprecate) {
3547 in6_ifa_hold(ifp);
1da177e4
LT		 3548
3549 ipv6_ifa_notify(0, ifp);
3550 in6_ifa_put(ifp);
3551 goto restart;
3552 }
3553#ifdef CONFIG_IPV6_PRIVACY
3554 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3555 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3556 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3557 ifp->idev->cnf.dad_transmits *
3558 ifp->idev->nd_parms->retrans_time / HZ;
3559
1da177e4
LT		 3560 if (age >= ifp->prefered_lft - regen_advance) {
3561 struct inet6_ifaddr *ifpub = ifp->ifpub;
3562 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3563 next = ifp->tstamp + ifp->prefered_lft * HZ;
3564 if (!ifp->regen_count && ifpub) {
3565 ifp->regen_count++;
3566 in6_ifa_hold(ifp);
3567 in6_ifa_hold(ifpub);
3568 spin_unlock(&ifp->lock);
5c578aed 3569
291d809b
HY		 3570 spin_lock(&ifpub->lock);
3571 ifpub->regen_count = 0;
3572 spin_unlock(&ifpub->lock);
1da177e4
LT		 3573 ipv6_create_tempaddr(ifpub, ifp);
3574 in6_ifa_put(ifpub);
3575 in6_ifa_put(ifp);
3576 goto restart;
3577 }
3578 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3579 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3580 spin_unlock(&ifp->lock);
3581#endif
3582 } else {
3583 /* ifp->prefered_lft <= ifp->valid_lft */
3584 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3585 next = ifp->tstamp + ifp->prefered_lft * HZ;
3586 spin_unlock(&ifp->lock);
3587 }
3588 }
1da177e4
LT		 3589 }
3590
b2db7564
YH		 3591 next_sec = round_jiffies_up(next);
3592 next_sched = next;
3593
3594 /* If rounded timeout is accurate enough, accept it. */
3595 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3596 next_sched = next_sec;
3597
3598 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3599 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3600 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3601
3602 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3603 now, next, next_sec, next_sched));
3604
3605 addr_chk_timer.expires = next_sched;
1da177e4 3606 add_timer(&addr_chk_timer);
5c578aed 3607 spin_unlock(&addrconf_verify_lock);
3608 rcu_read_unlock_bh();
1da177e4
LT		 3609}
3610
461d8837
TG		 3611static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3612{
3613 struct in6_addr *pfx = NULL;
3614
3615 if (addr)
3616 pfx = nla_data(addr);
3617
3618 if (local) {
3619 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3620 pfx = NULL;
3621 else
3622 pfx = nla_data(local);
3623 }
3624
3625 return pfx;
3626}
3627
ef7c79ed 3628static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3629 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3630 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3631 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3632};
3633
1da177e4 3634static int
661d2967 3635inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3636{
3b1e0a65 3637 struct net *net = sock_net(skb->sk);
b933f716
TG		 3638 struct ifaddrmsg *ifm;
3639 struct nlattr *tb[IFA_MAX+1];
1da177e4 3640 struct in6_addr *pfx;
b933f716 3641 int err;
1da177e4 3642
b933f716
TG		 3643 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3644 if (err < 0)
3645 return err;
3646
3647 ifm = nlmsg_data(nlh);
3648 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3649 if (pfx == NULL)
3650 return -EINVAL;
3651
af284937 3652 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3653}
3654
55ebaef1
NT		 3655static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3656 u32 prefered_lft, u32 valid_lft)
081bba5b 3657{
6f704992
YH		 3658 u32 flags;
3659 clock_t expires;
4bed72e4 3660 unsigned long timeout;
46d48046 3661
081bba5b
NT		 3662 if (!valid_lft || (prefered_lft > valid_lft))
3663 return -EINVAL;
3664
4bed72e4
YH		 3665 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3666 if (addrconf_finite_timeout(timeout)) {
3667 expires = jiffies_to_clock_t(timeout * HZ);
3668 valid_lft = timeout;
6f704992 3669 flags = RTF_EXPIRES;
4bed72e4
YH		 3670 } else {
3671 expires = 0;
3672 flags = 0;
3673 ifa_flags |= IFA_F_PERMANENT;
6f704992 3674 }
081bba5b 3675
4bed72e4
YH		 3676 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3677 if (addrconf_finite_timeout(timeout)) {
3678 if (timeout == 0)
3679 ifa_flags |= IFA_F_DEPRECATED;
3680 prefered_lft = timeout;
3681 }
081bba5b
NT		 3682
3683 spin_lock_bh(&ifp->lock);
3b9f9a1c 3684 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3685 ifp->tstamp = jiffies;
3686 ifp->valid_lft = valid_lft;
3687 ifp->prefered_lft = prefered_lft;
3688
3689 spin_unlock_bh(&ifp->lock);
3690 if (!(ifp->flags&IFA_F_TENTATIVE))
3691 ipv6_ifa_notify(0, ifp);
081bba5b 3692
46d48046 3693 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3694 expires, flags);
081bba5b
NT		 3695 addrconf_verify(0);
3696
3697 return 0;
3698}
3699
1da177e4 3700static int
661d2967 3701inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3702{
3b1e0a65 3703 struct net *net = sock_net(skb->sk);
461d8837
TG		 3704 struct ifaddrmsg *ifm;
3705 struct nlattr *tb[IFA_MAX+1];
1da177e4 3706 struct in6_addr *pfx;
7198f8ce
TG		 3707 struct inet6_ifaddr *ifa;
3708 struct net_device *dev;
55ebaef1
NT		 3709 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3710 u8 ifa_flags;
461d8837 3711 int err;
1da177e4 3712
461d8837
TG		 3713 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3714 if (err < 0)
3715 return err;
3716
3717 ifm = nlmsg_data(nlh);
3718 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3719 if (pfx == NULL)
3720 return -EINVAL;
3721
461d8837 3722 if (tb[IFA_CACHEINFO]) {
0778769d 3723 struct ifa_cacheinfo *ci;
461d8837
TG		 3724
3725 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3726 valid_lft = ci->ifa_valid;
461d8837
TG		 3727 preferred_lft = ci->ifa_prefered;
3728 } else {
3729 preferred_lft = INFINITY_LIFE_TIME;
3730 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3731 }
3732
af284937 3733 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3734 if (dev == NULL)
3735 return -ENODEV;
3736
55ebaef1 3737 /* We ignore other flags so far. */
3b9f9a1c 3738 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3739
1cab3da6 3740 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3741 if (ifa == NULL) {
3742 /*
3743 * It would be best to check for !NLM_F_CREATE here but
3744 * userspace alreay relies on not having to provide this.
3745 */
af284937
DL		 3746 return inet6_addr_add(net, ifm->ifa_index, pfx,
3747 ifm->ifa_prefixlen, ifa_flags,
3748 preferred_lft, valid_lft);
081bba5b
NT		 3749 }
3750
7198f8ce
TG		 3751 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3752 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3753 err = -EEXIST;
3754 else
55ebaef1 3755 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3756
3757 in6_ifa_put(ifa);
3758
3759 return err;
1da177e4
LT		 3760}
3761
101bb229
TG		 3762static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3763 u8 scope, int ifindex)
3764{
3765 struct ifaddrmsg *ifm;
3766
3767 ifm = nlmsg_data(nlh);
3768 ifm->ifa_family = AF_INET6;
3769 ifm->ifa_prefixlen = prefixlen;
3770 ifm->ifa_flags = flags;
3771 ifm->ifa_scope = scope;
3772 ifm->ifa_index = ifindex;
3773}
3774
85486af0
TG		 3775static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3776 unsigned long tstamp, u32 preferred, u32 valid)
3777{
3778 struct ifa_cacheinfo ci;
3779
18a31e1e
TG		 3780 ci.cstamp = cstamp_delta(cstamp);
3781 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 3782 ci.ifa_prefered = preferred;
3783 ci.ifa_valid = valid;
3784
3785 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3786}
3787
101bb229
TG		 3788static inline int rt_scope(int ifa_scope)
3789{
3790 if (ifa_scope & IFA_HOST)
3791 return RT_SCOPE_HOST;
3792 else if (ifa_scope & IFA_LINK)
3793 return RT_SCOPE_LINK;
3794 else if (ifa_scope & IFA_SITE)
3795 return RT_SCOPE_SITE;
3796 else
3797 return RT_SCOPE_UNIVERSE;
3798}
3799
0ab6803b
TG		 3800static inline int inet6_ifaddr_msgsize(void)
3801{
339bf98f
TG		 3802 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3803 + nla_total_size(16) /* IFA_ADDRESS */
3804 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3805}
c5396a31 3806
1da177e4 3807static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 3808 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3809{
1da177e4 3810 struct nlmsghdr *nlh;
85486af0 3811 u32 preferred, valid;
1da177e4 3812
15e47304 3813 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3814 if (nlh == NULL)
26932566 3815 return -EMSGSIZE;
0ab6803b 3816
101bb229
TG		 3817 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3818 ifa->idev->dev->ifindex);
3819
1da177e4 3820 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3821 preferred = ifa->prefered_lft;
3822 valid = ifa->valid_lft;
3823 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3824 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3825 if (preferred > tval)
3826 preferred -= tval;
3827 else
3828 preferred = 0;
f56619fc
BH		 3829 if (valid != INFINITY_LIFE_TIME) {
3830 if (valid > tval)
3831 valid -= tval;
3832 else
3833 valid = 0;
3834 }
1da177e4
LT		 3835 }
3836 } else {
85486af0
TG		 3837 preferred = INFINITY_LIFE_TIME;
3838 valid = INFINITY_LIFE_TIME;
3839 }
3840
0ab6803b 3841 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3842 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3843 nlmsg_cancel(skb, nlh);
3844 return -EMSGSIZE;
3845 }
1da177e4 3846
0ab6803b 3847 return nlmsg_end(skb, nlh);
1da177e4
LT		 3848}
3849
3850static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 3851 u32 portid, u32 seq, int event, u16 flags)
1da177e4 3852{
1da177e4 3853 struct nlmsghdr *nlh;
101bb229
TG		 3854 u8 scope = RT_SCOPE_UNIVERSE;
3855 int ifindex = ifmca->idev->dev->ifindex;
3856
3857 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3858 scope = RT_SCOPE_SITE;
1da177e4 3859
15e47304 3860 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3861 if (nlh == NULL)
26932566 3862 return -EMSGSIZE;
85486af0 3863
0ab6803b
TG		 3864 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3865 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3866 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3867 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3868 nlmsg_cancel(skb, nlh);
3869 return -EMSGSIZE;
3870 }
85486af0 3871
0ab6803b 3872 return nlmsg_end(skb, nlh);
1da177e4
LT		 3873}
3874
3875static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 3876 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3877{
1da177e4 3878 struct nlmsghdr *nlh;
101bb229
TG		 3879 u8 scope = RT_SCOPE_UNIVERSE;
3880 int ifindex = ifaca->aca_idev->dev->ifindex;
3881
3882 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3883 scope = RT_SCOPE_SITE;
1da177e4 3884
15e47304 3885 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3886 if (nlh == NULL)
26932566 3887 return -EMSGSIZE;
85486af0 3888
0ab6803b
TG		 3889 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3890 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3891 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3892 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3893 nlmsg_cancel(skb, nlh);
3894 return -EMSGSIZE;
3895 }
1da177e4 3896
0ab6803b 3897 return nlmsg_end(skb, nlh);
1da177e4
LT		 3898}
3899
e21e8467 3900enum addr_type_t {
1da177e4
LT		 3901 UNICAST_ADDR,
3902 MULTICAST_ADDR,
3903 ANYCAST_ADDR,
3904};
3905
234b27c3
ED		 3906/* called with rcu_read_lock() */
3907static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3908 struct netlink_callback *cb, enum addr_type_t type,
3909 int s_ip_idx, int *p_ip_idx)
3910{
234b27c3
ED		 3911 struct ifmcaddr6 *ifmca;
3912 struct ifacaddr6 *ifaca;
3913 int err = 1;
3914 int ip_idx = *p_ip_idx;
3915
3916 read_lock_bh(&idev->lock);
3917 switch (type) {
502a2ffd 3918 case UNICAST_ADDR: {
3919 struct inet6_ifaddr *ifa;
3920
234b27c3 3921 /* unicast address incl. temp addr */
502a2ffd 3922 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3923 if (++ip_idx < s_ip_idx)
234b27c3
ED		 3924 continue;
3925 err = inet6_fill_ifaddr(skb, ifa,
15e47304 3926 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3927 cb->nlh->nlmsg_seq,
3928 RTM_NEWADDR,
3929 NLM_F_MULTI);
3930 if (err <= 0)
3931 break;
63998ac2 3932 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 3933 }
3934 break;
502a2ffd 3935 }
234b27c3
ED		 3936 case MULTICAST_ADDR:
3937 /* multicast address */
3938 for (ifmca = idev->mc_list; ifmca;
3939 ifmca = ifmca->next, ip_idx++) {
3940 if (ip_idx < s_ip_idx)
3941 continue;
3942 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 3943 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3944 cb->nlh->nlmsg_seq,
3945 RTM_GETMULTICAST,
3946 NLM_F_MULTI);
3947 if (err <= 0)
3948 break;
3949 }
3950 break;
3951 case ANYCAST_ADDR:
3952 /* anycast address */
3953 for (ifaca = idev->ac_list; ifaca;
3954 ifaca = ifaca->aca_next, ip_idx++) {
3955 if (ip_idx < s_ip_idx)
3956 continue;
3957 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 3958 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3959 cb->nlh->nlmsg_seq,
3960 RTM_GETANYCAST,
3961 NLM_F_MULTI);
3962 if (err <= 0)
3963 break;
3964 }
3965 break;
3966 default:
3967 break;
3968 }
3969 read_unlock_bh(&idev->lock);
3970 *p_ip_idx = ip_idx;
3971 return err;
3972}
3973
1da177e4
LT		 3974static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3975 enum addr_type_t type)
3976{
234b27c3
ED		 3977 struct net *net = sock_net(skb->sk);
3978 int h, s_h;
1da177e4
LT		 3979 int idx, ip_idx;
3980 int s_idx, s_ip_idx;
1da177e4 3981 struct net_device *dev;
234b27c3
ED		 3982 struct inet6_dev *idev;
3983 struct hlist_head *head;
1ab1457c 3984
234b27c3
ED		 3985 s_h = cb->args[0];
3986 s_idx = idx = cb->args[1];
3987 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 3988
234b27c3 3989 rcu_read_lock();
63998ac2 3990 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 3991 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3992 idx = 0;
3993 head = &net->dev_index_head[h];
b67bfe0d 3994 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 3995 if (idx < s_idx)
3996 goto cont;
4b97efdf 3997 if (h > s_h || idx > s_idx)
234b27c3
ED		 3998 s_ip_idx = 0;
3999 ip_idx = 0;
e21e8467
SH		 4000 idev = __in6_dev_get(dev);
4001 if (!idev)
234b27c3
ED		 4002 goto cont;
4003
4004 if (in6_dump_addrs(idev, skb, cb, type,
4005 s_ip_idx, &ip_idx) <= 0)
4006 goto done;
7562f876 4007cont:
234b27c3
ED		 4008 idx++;
4009 }
1da177e4 4010 }
234b27c3
ED		 4011done:
4012 rcu_read_unlock();
4013 cb->args[0] = h;
4014 cb->args[1] = idx;
4015 cb->args[2] = ip_idx;
4016
1da177e4
LT		 4017 return skb->len;
4018}
4019
4020static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4021{
4022 enum addr_type_t type = UNICAST_ADDR;
b854272b 4023
1da177e4
LT		 4024 return inet6_dump_addr(skb, cb, type);
4025}
4026
4027static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4028{
4029 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4030
1da177e4
LT		 4031 return inet6_dump_addr(skb, cb, type);
4032}
4033
4034
4035static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4036{
4037 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4038
1da177e4
LT		 4039 return inet6_dump_addr(skb, cb, type);
4040}
4041
661d2967 4042static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4043{
3b1e0a65 4044 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4045 struct ifaddrmsg *ifm;
4046 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 4047 struct in6_addr *addr = NULL;
4048 struct net_device *dev = NULL;
4049 struct inet6_ifaddr *ifa;
4050 struct sk_buff *skb;
6c223828
NT		 4051 int err;
4052
1b29fc2c
TG		 4053 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4054 if (err < 0)
4055 goto errout;
4056
4057 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
4058 if (addr == NULL) {
4059 err = -EINVAL;
4060 goto errout;
6c223828 4061 }
6c223828 4062
1b29fc2c 4063 ifm = nlmsg_data(nlh);
6c223828 4064 if (ifm->ifa_index)
6fda7350 4065 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4066
e21e8467
SH		 4067 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4068 if (!ifa) {
1b29fc2c
TG		 4069 err = -EADDRNOTAVAIL;
4070 goto errout;
4071 }
6c223828 4072
e21e8467
SH		 4073 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4074 if (!skb) {
6c223828 4075 err = -ENOBUFS;
1b29fc2c 4076 goto errout_ifa;
6c223828
NT		 4077 }
4078
15e47304 4079 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4080 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4081 if (err < 0) {
4082 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4083 WARN_ON(err == -EMSGSIZE);
4084 kfree_skb(skb);
4085 goto errout_ifa;
4086 }
15e47304 4087 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4088errout_ifa:
6c223828 4089 in6_ifa_put(ifa);
1b29fc2c 4090errout:
6c223828 4091 return err;
6c223828
NT		 4092}
4093
1da177e4
LT		 4094static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4095{
4096 struct sk_buff *skb;
c346dca1 4097 struct net *net = dev_net(ifa->idev->dev);
5d620266 4098 int err = -ENOBUFS;
1da177e4 4099
0ab6803b 4100 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 4101 if (skb == NULL)
4102 goto errout;
4103
4104 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4105 if (err < 0) {
4106 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4107 WARN_ON(err == -EMSGSIZE);
4108 kfree_skb(skb);
4109 goto errout;
4110 }
1ce85fe4
PNA		 4111 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4112 return;
5d620266
TG		 4113errout:
4114 if (err < 0)
6fda7350 4115 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4116}
4117
b6f99a21 4118static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4119 __s32 *array, int bytes)
4120{
04561c1f
TG		 4121 BUG_ON(bytes < (DEVCONF_MAX * 4));
4122
1da177e4
LT		 4123 memset(array, 0, bytes);
4124 array[DEVCONF_FORWARDING] = cnf->forwarding;
4125 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4126 array[DEVCONF_MTU6] = cnf->mtu6;
4127 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4128 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4129 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4130 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4131 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4132 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4133 jiffies_to_msecs(cnf->rtr_solicit_interval);
4134 array[DEVCONF_RTR_SOLICIT_DELAY] =
4135 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4
LT		 4136 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4137#ifdef CONFIG_IPV6_PRIVACY
4138 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4139 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4140 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4141 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4142 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4143#endif
4144 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4145 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 4146 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4147#ifdef CONFIG_IPV6_ROUTER_PREF
4148 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4149 array[DEVCONF_RTR_PROBE_INTERVAL] =
4150 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4151#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4152 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4153#endif
930d6ff2 4154#endif
fbea49e1 4155 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4156 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4157#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4158 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4159#endif
7bc570c8
YH		 4160#ifdef CONFIG_IPV6_MROUTE
4161 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4162#endif
778d80be 4163 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4164 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4165 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4166 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
1da177e4
LT		 4167}
4168
b382b191
TG		 4169static inline size_t inet6_ifla6_size(void)
4170{
4171 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4172 + nla_total_size(sizeof(struct ifla_cacheinfo))
4173 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4174 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4175 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4176 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4177}
4178
339bf98f
TG		 4179static inline size_t inet6_if_nlmsg_size(void)
4180{
4181 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4182 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4183 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4184 + nla_total_size(4) /* IFLA_MTU */
4185 + nla_total_size(4) /* IFLA_LINK */
b382b191 4186 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4187}
c5396a31 4188
be281e55 4189static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4190 int items, int bytes)
7f7d9a6b
HX		 4191{
4192 int i;
4193 int pad = bytes - sizeof(u64) * items;
4194 BUG_ON(pad < 0);
4195
4196 /* Use put_unaligned() because stats may not be aligned for u64. */
4197 put_unaligned(items, &stats[0]);
4198 for (i = 1; i < items; i++)
be281e55 4199 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4200
4201 memset(&stats[items], 0, pad);
4202}
4203
4ce3c183
ED		 4204static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4205 int items, int bytes, size_t syncpoff)
4206{
4207 int i;
4208 int pad = bytes - sizeof(u64) * items;
4209 BUG_ON(pad < 0);
4210
4211 /* Use put_unaligned() because stats may not be aligned for u64. */
4212 put_unaligned(items, &stats[0]);
4213 for (i = 1; i < items; i++)
4214 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4215
4216 memset(&stats[items], 0, pad);
4217}
4218
7f7d9a6b
HX		 4219static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4220 int bytes)
4221{
e21e8467 4222 switch (attrtype) {
7f7d9a6b 4223 case IFLA_INET6_STATS:
4ce3c183
ED		 4224 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4225 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4226 break;
4227 case IFLA_INET6_ICMP6STATS:
be281e55 4228 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4229 break;
4230 }
4231}
4232
b382b191
TG		 4233static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4234{
4235 struct nlattr *nla;
4236 struct ifla_cacheinfo ci;
4237
c78679e8
DM		 4238 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4239 goto nla_put_failure;
b382b191 4240 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4241 ci.tstamp = cstamp_delta(idev->tstamp);
4242 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4243 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
c78679e8
DM		 4244 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4245 goto nla_put_failure;
b382b191
TG		 4246 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4247 if (nla == NULL)
4248 goto nla_put_failure;
4249 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4250
4251 /* XXX - MC not implemented */
4252
4253 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4254 if (nla == NULL)
4255 goto nla_put_failure;
4256 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4257
4258 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4259 if (nla == NULL)
4260 goto nla_put_failure;
4261 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4262
f53adae4
DB		 4263 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4264 if (nla == NULL)
4265 goto nla_put_failure;
4266 read_lock_bh(&idev->lock);
4267 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4268 read_unlock_bh(&idev->lock);
4269
b382b191
TG		 4270 return 0;
4271
4272nla_put_failure:
4273 return -EMSGSIZE;
4274}
4275
4276static size_t inet6_get_link_af_size(const struct net_device *dev)
4277{
4278 if (!__in6_dev_get(dev))
4279 return 0;
4280
4281 return inet6_ifla6_size();
4282}
4283
4284static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4285{
4286 struct inet6_dev *idev = __in6_dev_get(dev);
4287
4288 if (!idev)
4289 return -ENODATA;
4290
4291 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4292 return -EMSGSIZE;
4293
4294 return 0;
4295}
4296
f53adae4
DB		 4297static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4298{
4299 struct in6_addr ll_addr;
4300 struct inet6_ifaddr *ifp;
4301 struct net_device *dev = idev->dev;
4302
4303 if (token == NULL)
4304 return -EINVAL;
4305 if (ipv6_addr_any(token))
4306 return -EINVAL;
4307 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4308 return -EINVAL;
4309 if (idev->dead || !(idev->if_flags & IF_READY))
4310 return -EINVAL;
4311 if (!ipv6_accept_ra(idev))
4312 return -EINVAL;
4313 if (idev->cnf.rtr_solicits <= 0)
4314 return -EINVAL;
4315
4316 write_lock_bh(&idev->lock);
4317
4318 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4319 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4320
4321 write_unlock_bh(&idev->lock);
4322
4323 ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | IFA_F_OPTIMISTIC);
4324 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4325
4326 write_lock_bh(&idev->lock);
4327 idev->if_flags |= IF_RS_SENT;
4328
4329 /* Well, that's kinda nasty ... */
4330 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4331 spin_lock(&ifp->lock);
4332 if (ipv6_addr_src_scope(&ifp->addr) ==
4333 IPV6_ADDR_SCOPE_GLOBAL) {
4334 ifp->valid_lft = 0;
4335 ifp->prefered_lft = 0;
4336 }
4337 spin_unlock(&ifp->lock);
4338 }
4339
4340 write_unlock_bh(&idev->lock);
4341 return 0;
4342}
4343
4344static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4345{
4346 int err = -EINVAL;
4347 struct inet6_dev *idev = __in6_dev_get(dev);
4348 struct nlattr *tb[IFLA_INET6_MAX + 1];
4349
4350 if (!idev)
4351 return -EAFNOSUPPORT;
4352
4353 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4354 BUG();
4355
4356 if (tb[IFLA_INET6_TOKEN])
4357 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4358
4359 return err;
4360}
4361
1ab1457c 4362static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4363 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4364{
04561c1f 4365 struct net_device *dev = idev->dev;
04561c1f
TG		 4366 struct ifinfomsg *hdr;
4367 struct nlmsghdr *nlh;
4368 void *protoinfo;
04561c1f 4369
15e47304 4370 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
04561c1f 4371 if (nlh == NULL)
26932566 4372 return -EMSGSIZE;
04561c1f
TG		 4373
4374 hdr = nlmsg_data(nlh);
4375 hdr->ifi_family = AF_INET6;
4376 hdr->__ifi_pad = 0;
4377 hdr->ifi_type = dev->type;
4378 hdr->ifi_index = dev->ifindex;
4379 hdr->ifi_flags = dev_get_flags(dev);
4380 hdr->ifi_change = 0;
4381
c78679e8
DM		 4382 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4383 (dev->addr_len &&
4384 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4385 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4386 (dev->ifindex != dev->iflink &&
4387 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4388 goto nla_put_failure;
04561c1f
TG		 4389 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4390 if (protoinfo == NULL)
4391 goto nla_put_failure;
1da177e4 4392
b382b191 4393 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4394 goto nla_put_failure;
1da177e4 4395
04561c1f
TG		 4396 nla_nest_end(skb, protoinfo);
4397 return nlmsg_end(skb, nlh);
1da177e4 4398
04561c1f 4399nla_put_failure:
26932566
PM		 4400 nlmsg_cancel(skb, nlh);
4401 return -EMSGSIZE;
1da177e4
LT		 4402}
4403
4404static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4405{
3b1e0a65 4406 struct net *net = sock_net(skb->sk);
84d2697d 4407 int h, s_h;
434a8a58 4408 int idx = 0, s_idx;
1da177e4
LT		 4409 struct net_device *dev;
4410 struct inet6_dev *idev;
84d2697d 4411 struct hlist_head *head;
1da177e4 4412
84d2697d
ED		 4413 s_h = cb->args[0];
4414 s_idx = cb->args[1];
4415
4416 rcu_read_lock();
4417 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4418 idx = 0;
4419 head = &net->dev_index_head[h];
b67bfe0d 4420 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 4421 if (idx < s_idx)
4422 goto cont;
4423 idev = __in6_dev_get(dev);
4424 if (!idev)
4425 goto cont;
4426 if (inet6_fill_ifinfo(skb, idev,
15e47304 4427 NETLINK_CB(cb->skb).portid,
84d2697d
ED		 4428 cb->nlh->nlmsg_seq,
4429 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4430 goto out;
7562f876 4431cont:
84d2697d
ED		 4432 idx++;
4433 }
1da177e4 4434 }
84d2697d
ED		 4435out:
4436 rcu_read_unlock();
4437 cb->args[1] = idx;
4438 cb->args[0] = h;
1da177e4
LT		 4439
4440 return skb->len;
4441}
4442
4443void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4444{
4445 struct sk_buff *skb;
c346dca1 4446 struct net *net = dev_net(idev->dev);
8d7a76c9 4447 int err = -ENOBUFS;
1ab1457c 4448
339bf98f 4449 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4450 if (skb == NULL)
4451 goto errout;
4452
4453 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4454 if (err < 0) {
4455 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4456 WARN_ON(err == -EMSGSIZE);
4457 kfree_skb(skb);
4458 goto errout;
4459 }
5f75a104 4460 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4461 return;
8d7a76c9
TG		 4462errout:
4463 if (err < 0)
5f75a104 4464 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4465}
4466
339bf98f
TG		 4467static inline size_t inet6_prefix_nlmsg_size(void)
4468{
4469 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4470 + nla_total_size(sizeof(struct in6_addr))
4471 + nla_total_size(sizeof(struct prefix_cacheinfo));
4472}
c5396a31 4473
1da177e4 4474static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4475 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 4476 int event, unsigned int flags)
1da177e4 4477{
6051e2f4
TG		 4478 struct prefixmsg *pmsg;
4479 struct nlmsghdr *nlh;
1da177e4
LT		 4480 struct prefix_cacheinfo ci;
4481
15e47304 4482 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6051e2f4 4483 if (nlh == NULL)
26932566 4484 return -EMSGSIZE;
6051e2f4
TG		 4485
4486 pmsg = nlmsg_data(nlh);
1da177e4 4487 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4488 pmsg->prefix_pad1 = 0;
4489 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4490 pmsg->prefix_ifindex = idev->dev->ifindex;
4491 pmsg->prefix_len = pinfo->prefix_len;
4492 pmsg->prefix_type = pinfo->type;
8a47077a 4493 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4494 pmsg->prefix_flags = 0;
4495 if (pinfo->onlink)
4496 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4497 if (pinfo->autoconf)
4498 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4499
c78679e8
DM		 4500 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4501 goto nla_put_failure;
1da177e4
LT		 4502 ci.preferred_time = ntohl(pinfo->prefered);
4503 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 4504 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4505 goto nla_put_failure;
6051e2f4 4506 return nlmsg_end(skb, nlh);
1da177e4 4507
6051e2f4 4508nla_put_failure:
26932566
PM		 4509 nlmsg_cancel(skb, nlh);
4510 return -EMSGSIZE;
1da177e4
LT		 4511}
4512
1ab1457c 4513static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4514 struct prefix_info *pinfo)
4515{
4516 struct sk_buff *skb;
c346dca1 4517 struct net *net = dev_net(idev->dev);
8c384bfa 4518 int err = -ENOBUFS;
1da177e4 4519
339bf98f 4520 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4521 if (skb == NULL)
4522 goto errout;
4523
4524 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4525 if (err < 0) {
4526 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4527 WARN_ON(err == -EMSGSIZE);
4528 kfree_skb(skb);
4529 goto errout;
4530 }
1ce85fe4
PNA		 4531 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4532 return;
8c384bfa
TG		 4533errout:
4534 if (err < 0)
6fda7350 4535 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4536}
4537
1da177e4
LT		 4538static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4539{
63998ac2
ND		 4540 struct net *net = dev_net(ifp->idev->dev);
4541
1da177e4
LT		 4542 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4543
4544 switch (event) {
4545 case RTM_NEWADDR:
95c385b4
NH		 4546 /*
4547 * If the address was optimistic
4548 * we inserted the route at the start of
4549 * our DAD process, so we don't need
4550 * to do it again
4551 */
4552 if (!(ifp->rt->rt6i_node))
4553 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4554 if (ifp->idev->cnf.forwarding)
4555 addrconf_join_anycast(ifp);
4556 break;
4557 case RTM_DELADDR:
4558 if (ifp->idev->cnf.forwarding)
4559 addrconf_leave_anycast(ifp);
4560 addrconf_leave_solict(ifp->idev, &ifp->addr);
d8d1f30b 4561 dst_hold(&ifp->rt->dst);
93fa159a 4562
73a8bd74 4563 if (ip6_del_rt(ifp->rt))
d8d1f30b 4564 dst_free(&ifp->rt->dst);
1da177e4
LT		 4565 break;
4566 }
63998ac2 4567 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 4568}
4569
4570static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4571{
8814c4b5 4572 rcu_read_lock_bh();
1da177e4
LT		 4573 if (likely(ifp->idev->dead == 0))
4574 __ipv6_ifa_notify(event, ifp);
8814c4b5 4575 rcu_read_unlock_bh();
1da177e4
LT		 4576}
4577
4578#ifdef CONFIG_SYSCTL
4579
4580static
8d65af78 4581int addrconf_sysctl_forward(ctl_table *ctl, int write,
1da177e4
LT		 4582 void __user *buffer, size_t *lenp, loff_t *ppos)
4583{
4584 int *valp = ctl->data;
4585 int val = *valp;
88af182e 4586 loff_t pos = *ppos;
013d97e9 4587 ctl_table lctl;
1da177e4
LT		 4588 int ret;
4589
013d97e9
FR		 4590 /*
4591 * ctl->data points to idev->cnf.forwarding, we should
4592 * not modify it until we get the rtnl lock.
4593 */
4594 lctl = *ctl;
4595 lctl.data = &val;
4596
4597 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 4598
c8fecf22 4599 if (write)
b325fddb 4600 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4601 if (ret)
4602 *ppos = pos;
1ab1457c 4603 return ret;
1da177e4
LT		 4604}
4605
56d417b1
BH		 4606static void dev_disable_change(struct inet6_dev *idev)
4607{
4608 if (!idev || !idev->dev)
4609 return;
4610
4611 if (idev->cnf.disable_ipv6)
4612 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4613 else
4614 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4615}
4616
4617static void addrconf_disable_change(struct net *net, __s32 newf)
4618{
4619 struct net_device *dev;
4620 struct inet6_dev *idev;
4621
c6d14c84
ED		 4622 rcu_read_lock();
4623 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4624 idev = __in6_dev_get(dev);
4625 if (idev) {
4626 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4627 idev->cnf.disable_ipv6 = newf;
4628 if (changed)
4629 dev_disable_change(idev);
4630 }
56d417b1 4631 }
c6d14c84 4632 rcu_read_unlock();
56d417b1
BH		 4633}
4634
013d97e9 4635static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 4636{
4637 struct net *net;
013d97e9
FR		 4638 int old;
4639
4640 if (!rtnl_trylock())
4641 return restart_syscall();
56d417b1
BH		 4642
4643 net = (struct net *)table->extra2;
013d97e9
FR		 4644 old = *p;
4645 *p = newf;
56d417b1 4646
013d97e9
FR		 4647 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4648 rtnl_unlock();
56d417b1 4649 return 0;
88af182e 4650 }
56d417b1
BH		 4651
4652 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 4653 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4654 addrconf_disable_change(net, newf);
013d97e9 4655 } else if ((!newf) ^ (!old))
56d417b1
BH		 4656 dev_disable_change((struct inet6_dev *)table->extra1);
4657
4658 rtnl_unlock();
4659 return 0;
4660}
4661
4662static
8d65af78 4663int addrconf_sysctl_disable(ctl_table *ctl, int write,
56d417b1
BH		 4664 void __user *buffer, size_t *lenp, loff_t *ppos)
4665{
4666 int *valp = ctl->data;
4667 int val = *valp;
88af182e 4668 loff_t pos = *ppos;
013d97e9 4669 ctl_table lctl;
56d417b1
BH		 4670 int ret;
4671
013d97e9
FR		 4672 /*
4673 * ctl->data points to idev->cnf.disable_ipv6, we should
4674 * not modify it until we get the rtnl lock.
4675 */
4676 lctl = *ctl;
4677 lctl.data = &val;
4678
4679 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 4680
4681 if (write)
4682 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4683 if (ret)
4684 *ppos = pos;
56d417b1
BH		 4685 return ret;
4686}
4687
1da177e4
LT		 4688static struct addrconf_sysctl_table
4689{
4690 struct ctl_table_header *sysctl_header;
f6a07b29 4691 ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 4692} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4693 .sysctl_header = NULL,
4694 .addrconf_vars = {
1ab1457c 4695 {
e21e8467
SH		 4696 .procname = "forwarding",
4697 .data = &ipv6_devconf.forwarding,
4698 .maxlen = sizeof(int),
4699 .mode = 0644,
4700 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4701 },
4702 {
e21e8467
SH		 4703 .procname = "hop_limit",
4704 .data = &ipv6_devconf.hop_limit,
4705 .maxlen = sizeof(int),
4706 .mode = 0644,
4707 .proc_handler = proc_dointvec,
1da177e4
LT		 4708 },
4709 {
e21e8467
SH		 4710 .procname = "mtu",
4711 .data = &ipv6_devconf.mtu6,
4712 .maxlen = sizeof(int),
4713 .mode = 0644,
4714 .proc_handler = proc_dointvec,
1da177e4
LT		 4715 },
4716 {
e21e8467
SH		 4717 .procname = "accept_ra",
4718 .data = &ipv6_devconf.accept_ra,
4719 .maxlen = sizeof(int),
4720 .mode = 0644,
4721 .proc_handler = proc_dointvec,
1da177e4
LT		 4722 },
4723 {
e21e8467
SH		 4724 .procname = "accept_redirects",
4725 .data = &ipv6_devconf.accept_redirects,
4726 .maxlen = sizeof(int),
4727 .mode = 0644,
4728 .proc_handler = proc_dointvec,
1da177e4
LT		 4729 },
4730 {
e21e8467
SH		 4731 .procname = "autoconf",
4732 .data = &ipv6_devconf.autoconf,
4733 .maxlen = sizeof(int),
4734 .mode = 0644,
4735 .proc_handler = proc_dointvec,
1da177e4
LT		 4736 },
4737 {
e21e8467
SH		 4738 .procname = "dad_transmits",
4739 .data = &ipv6_devconf.dad_transmits,
4740 .maxlen = sizeof(int),
4741 .mode = 0644,
4742 .proc_handler = proc_dointvec,
1da177e4
LT		 4743 },
4744 {
e21e8467
SH		 4745 .procname = "router_solicitations",
4746 .data = &ipv6_devconf.rtr_solicits,
4747 .maxlen = sizeof(int),
4748 .mode = 0644,
4749 .proc_handler = proc_dointvec,
1da177e4
LT		 4750 },
4751 {
e21e8467
SH		 4752 .procname = "router_solicitation_interval",
4753 .data = &ipv6_devconf.rtr_solicit_interval,
4754 .maxlen = sizeof(int),
4755 .mode = 0644,
4756 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4757 },
4758 {
e21e8467
SH		 4759 .procname = "router_solicitation_delay",
4760 .data = &ipv6_devconf.rtr_solicit_delay,
4761 .maxlen = sizeof(int),
4762 .mode = 0644,
4763 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4764 },
4765 {
e21e8467
SH		 4766 .procname = "force_mld_version",
4767 .data = &ipv6_devconf.force_mld_version,
4768 .maxlen = sizeof(int),
4769 .mode = 0644,
4770 .proc_handler = proc_dointvec,
1da177e4
LT		 4771 },
4772#ifdef CONFIG_IPV6_PRIVACY
4773 {
e21e8467
SH		 4774 .procname = "use_tempaddr",
4775 .data = &ipv6_devconf.use_tempaddr,
4776 .maxlen = sizeof(int),
4777 .mode = 0644,
4778 .proc_handler = proc_dointvec,
1da177e4
LT		 4779 },
4780 {
e21e8467
SH		 4781 .procname = "temp_valid_lft",
4782 .data = &ipv6_devconf.temp_valid_lft,
4783 .maxlen = sizeof(int),
4784 .mode = 0644,
4785 .proc_handler = proc_dointvec,
1da177e4
LT		 4786 },
4787 {
e21e8467
SH		 4788 .procname = "temp_prefered_lft",
4789 .data = &ipv6_devconf.temp_prefered_lft,
4790 .maxlen = sizeof(int),
4791 .mode = 0644,
4792 .proc_handler = proc_dointvec,
1da177e4
LT		 4793 },
4794 {
e21e8467
SH		 4795 .procname = "regen_max_retry",
4796 .data = &ipv6_devconf.regen_max_retry,
4797 .maxlen = sizeof(int),
4798 .mode = 0644,
4799 .proc_handler = proc_dointvec,
1da177e4
LT		 4800 },
4801 {
e21e8467
SH		 4802 .procname = "max_desync_factor",
4803 .data = &ipv6_devconf.max_desync_factor,
4804 .maxlen = sizeof(int),
4805 .mode = 0644,
4806 .proc_handler = proc_dointvec,
1da177e4
LT		 4807 },
4808#endif
4809 {
e21e8467
SH		 4810 .procname = "max_addresses",
4811 .data = &ipv6_devconf.max_addresses,
4812 .maxlen = sizeof(int),
4813 .mode = 0644,
4814 .proc_handler = proc_dointvec,
1da177e4 4815 },
65f5c7c1 4816 {
e21e8467
SH		 4817 .procname = "accept_ra_defrtr",
4818 .data = &ipv6_devconf.accept_ra_defrtr,
4819 .maxlen = sizeof(int),
4820 .mode = 0644,
4821 .proc_handler = proc_dointvec,
65f5c7c1 4822 },
c4fd30eb 4823 {
e21e8467
SH		 4824 .procname = "accept_ra_pinfo",
4825 .data = &ipv6_devconf.accept_ra_pinfo,
4826 .maxlen = sizeof(int),
4827 .mode = 0644,
4828 .proc_handler = proc_dointvec,
c4fd30eb 4829 },
930d6ff2
YH		 4830#ifdef CONFIG_IPV6_ROUTER_PREF
4831 {
e21e8467
SH		 4832 .procname = "accept_ra_rtr_pref",
4833 .data = &ipv6_devconf.accept_ra_rtr_pref,
4834 .maxlen = sizeof(int),
4835 .mode = 0644,
4836 .proc_handler = proc_dointvec,
930d6ff2 4837 },
52e16356 4838 {
e21e8467
SH		 4839 .procname = "router_probe_interval",
4840 .data = &ipv6_devconf.rtr_probe_interval,
4841 .maxlen = sizeof(int),
4842 .mode = 0644,
4843 .proc_handler = proc_dointvec_jiffies,
52e16356 4844 },
fa03ef38 4845#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4846 {
e21e8467
SH		 4847 .procname = "accept_ra_rt_info_max_plen",
4848 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4849 .maxlen = sizeof(int),
4850 .mode = 0644,
4851 .proc_handler = proc_dointvec,
09c884d4
YH		 4852 },
4853#endif
930d6ff2 4854#endif
fbea49e1 4855 {
e21e8467
SH		 4856 .procname = "proxy_ndp",
4857 .data = &ipv6_devconf.proxy_ndp,
4858 .maxlen = sizeof(int),
4859 .mode = 0644,
4860 .proc_handler = proc_dointvec,
fbea49e1 4861 },
0bcbc926 4862 {
e21e8467
SH		 4863 .procname = "accept_source_route",
4864 .data = &ipv6_devconf.accept_source_route,
4865 .maxlen = sizeof(int),
4866 .mode = 0644,
4867 .proc_handler = proc_dointvec,
0bcbc926 4868 },
95c385b4
NH		 4869#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4870 {
e21e8467
SH		 4871 .procname = "optimistic_dad",
4872 .data = &ipv6_devconf.optimistic_dad,
4873 .maxlen = sizeof(int),
4874 .mode = 0644,
4875 .proc_handler = proc_dointvec,
95c385b4
NH		 4876
4877 },
7bc570c8
YH		 4878#endif
4879#ifdef CONFIG_IPV6_MROUTE
4880 {
e21e8467
SH		 4881 .procname = "mc_forwarding",
4882 .data = &ipv6_devconf.mc_forwarding,
4883 .maxlen = sizeof(int),
4884 .mode = 0444,
4885 .proc_handler = proc_dointvec,
7bc570c8 4886 },
95c385b4 4887#endif
778d80be 4888 {
e21e8467
SH		 4889 .procname = "disable_ipv6",
4890 .data = &ipv6_devconf.disable_ipv6,
4891 .maxlen = sizeof(int),
4892 .mode = 0644,
4893 .proc_handler = addrconf_sysctl_disable,
778d80be 4894 },
1b34be74 4895 {
e21e8467
SH		 4896 .procname = "accept_dad",
4897 .data = &ipv6_devconf.accept_dad,
4898 .maxlen = sizeof(int),
4899 .mode = 0644,
4900 .proc_handler = proc_dointvec,
1b34be74 4901 },
f7734fdf 4902 {
f7734fdf
OP		 4903 .procname = "force_tllao",
4904 .data = &ipv6_devconf.force_tllao,
4905 .maxlen = sizeof(int),
4906 .mode = 0644,
4907 .proc_handler = proc_dointvec
4908 },
5cb04436
HFS		 4909 {
4910 .procname = "ndisc_notify",
4911 .data = &ipv6_devconf.ndisc_notify,
4912 .maxlen = sizeof(int),
4913 .mode = 0644,
4914 .proc_handler = proc_dointvec
4915 },
1da177e4 4916 {
f8572d8f 4917 /* sentinel */
1da177e4
LT		 4918 }
4919 },
1da177e4
LT		 4920};
4921
bff16c2f 4922static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4923 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4924{
4925 int i;
1da177e4 4926 struct addrconf_sysctl_table *t;
6105e293 4927 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 4928
af879cc7 4929 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4930 if (t == NULL)
f68635e6
PE		 4931 goto out;
4932
bcdd553f 4933 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 4934 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 4935 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4936 t->addrconf_vars[i].extra2 = net;
1da177e4 4937 }
1da177e4 4938
6105e293 4939 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 4940
6105e293 4941 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
1da177e4 4942 if (t->sysctl_header == NULL)
6105e293 4943 goto free;
f68635e6
PE		 4944
4945 p->sysctl = t;
95897312 4946 return 0;
1da177e4 4947
f68635e6 4948free:
1da177e4 4949 kfree(t);
f68635e6 4950out:
95897312 4951 return -ENOBUFS;
1da177e4
LT		 4952}
4953
408c4768
PE		 4954static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4955{
4956 struct addrconf_sysctl_table *t;
4957
4958 if (p->sysctl == NULL)
4959 return;
4960
4961 t = p->sysctl;
4962 p->sysctl = NULL;
ff538818 4963 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 4964 kfree(t);
4965}
4966
f52295a9
PE		 4967static void addrconf_sysctl_register(struct inet6_dev *idev)
4968{
54716e3b 4969 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 4970 &ndisc_ifinfo_sysctl_change);
c346dca1 4971 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 4972 idev, &idev->cnf);
f52295a9
PE		 4973}
4974
408c4768 4975static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4976{
408c4768
PE		 4977 __addrconf_sysctl_unregister(&idev->cnf);
4978 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4979}
4980
4981
4982#endif
4983
2c8c1e72 4984static int __net_init addrconf_init_net(struct net *net)
e0da5a48 4985{
a79ca223 4986 int err = -ENOMEM;
e0da5a48
PE		 4987 struct ipv6_devconf *all, *dflt;
4988
a79ca223
HZ		 4989 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
4990 if (all == NULL)
4991 goto err_alloc_all;
e0da5a48 4992
a79ca223
HZ		 4993 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4994 if (dflt == NULL)
4995 goto err_alloc_dflt;
e0da5a48 4996
a79ca223
HZ		 4997 /* these will be inherited by all namespaces */
4998 dflt->autoconf = ipv6_defaults.autoconf;
4999 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 5000
5001 net->ipv6.devconf_all = all;
5002 net->ipv6.devconf_dflt = dflt;
5003
5004#ifdef CONFIG_SYSCTL
f8572d8f 5005 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 5006 if (err < 0)
5007 goto err_reg_all;
5008
f8572d8f 5009 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 5010 if (err < 0)
5011 goto err_reg_dflt;
5012#endif
5013 return 0;
5014
5015#ifdef CONFIG_SYSCTL
5016err_reg_dflt:
5017 __addrconf_sysctl_unregister(all);
5018err_reg_all:
5019 kfree(dflt);
5020#endif
5021err_alloc_dflt:
5022 kfree(all);
5023err_alloc_all:
5024 return err;
5025}
5026
2c8c1e72 5027static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 5028{
5029#ifdef CONFIG_SYSCTL
5030 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5031 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5032#endif
09ad9bc7 5033 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 5034 kfree(net->ipv6.devconf_dflt);
5035 kfree(net->ipv6.devconf_all);
5036 }
5037}
5038
5039static struct pernet_operations addrconf_ops = {
5040 .init = addrconf_init_net,
5041 .exit = addrconf_exit_net,
5042};
5043
1da177e4
LT		 5044/*
5045 * Device notifier
5046 */
5047
5048int register_inet6addr_notifier(struct notifier_block *nb)
5049{
1ab1457c 5050 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4 5051}
7159039a
YH		 5052EXPORT_SYMBOL(register_inet6addr_notifier);
5053
1da177e4
LT		 5054int unregister_inet6addr_notifier(struct notifier_block *nb)
5055{
e21e8467 5056 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
1da177e4 5057}
7159039a
YH		 5058EXPORT_SYMBOL(unregister_inet6addr_notifier);
5059
b382b191
TG		 5060static struct rtnl_af_ops inet6_ops = {
5061 .family = AF_INET6,
5062 .fill_link_af = inet6_fill_link_af,
5063 .get_link_af_size = inet6_get_link_af_size,
f53adae4 5064 .set_link_af = inet6_set_link_af,
b382b191
TG		 5065};
5066
1da177e4
LT		 5067/*
5068 * Init / cleanup code
5069 */
5070
5071int __init addrconf_init(void)
5072{
c2e21293 5073 int i, err;
2a8cc6c8 5074
e21e8467
SH		 5075 err = ipv6_addr_label_init();
5076 if (err < 0) {
f3213831
JP		 5077 pr_crit("%s: cannot initialize default policy table: %d\n",
5078 __func__, err);
2cc6d2bf 5079 goto out;
2a8cc6c8 5080 }
1da177e4 5081
2cc6d2bf
NH		 5082 err = register_pernet_subsys(&addrconf_ops);
5083 if (err < 0)
5084 goto out_addrlabel;
e0da5a48 5085
1da177e4
LT		 5086 /* The addrconf netdev notifier requires that loopback_dev
5087 * has it's ipv6 private information allocated and setup
5088 * before it can bring up and give link-local addresses
5089 * to other devices which are up.
5090 *
5091 * Unfortunately, loopback_dev is not necessarily the first
5092 * entry in the global dev_base list of net devices. In fact,
5093 * it is likely to be the very last entry on that list.
5094 * So this causes the notifier registry below to try and
5095 * give link-local addresses to all devices besides loopback_dev
5096 * first, then loopback_dev, which cases all the non-loopback_dev
5097 * devices to fail to get a link-local address.
5098 *
5099 * So, as a temporary fix, allocate the ipv6 structure for
5100 * loopback_dev first by hand.
5101 * Longer term, all of the dependencies ipv6 has upon the loopback
5102 * device and it being up should be removed.
5103 */
5104 rtnl_lock();
2774c7ab 5105 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 5106 err = -ENOMEM;
5107 rtnl_unlock();
5108 if (err)
e0da5a48 5109 goto errlo;
1da177e4 5110
c2e21293 5111 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5112 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5113
1da177e4
LT		 5114 register_netdevice_notifier(&ipv6_dev_notf);
5115
1da177e4 5116 addrconf_verify(0);
c127ea2c 5117
b382b191
TG		 5118 err = rtnl_af_register(&inet6_ops);
5119 if (err < 0)
5120 goto errout_af;
5121
c7ac8679
GR		 5122 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5123 NULL);
c127ea2c
TG		 5124 if (err < 0)
5125 goto errout;
5126
5127 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 5128 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5129 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5130 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5131 inet6_dump_ifaddr, NULL);
5132 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5133 inet6_dump_ifmcaddr, NULL);
5134 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5135 inet6_dump_ifacaddr, NULL);
76f8f6cb 5136 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 5137 inet6_netconf_dump_devconf, NULL);
c127ea2c 5138
2a8cc6c8
YH		 5139 ipv6_addr_label_rtnl_register();
5140
1da177e4 5141 return 0;
c127ea2c 5142errout:
b382b191
TG		 5143 rtnl_af_unregister(&inet6_ops);
5144errout_af:
c127ea2c 5145 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 5146errlo:
5147 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 5148out_addrlabel:
5149 ipv6_addr_label_cleanup();
5150out:
c127ea2c 5151 return err;
1da177e4
LT		 5152}
5153
09f7709f 5154void addrconf_cleanup(void)
1da177e4 5155{
176c39af 5156 struct net_device *dev;
1da177e4
LT		 5157 int i;
5158
5159 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5160 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 5161 ipv6_addr_label_cleanup();
1da177e4
LT		 5162
5163 rtnl_lock();
5164
b382b191
TG		 5165 __rtnl_af_unregister(&inet6_ops);
5166
176c39af
DL		 5167 /* clean dev list */
5168 for_each_netdev(&init_net, dev) {
5169 if (__in6_dev_get(dev) == NULL)
5170 continue;
5171 addrconf_ifdown(dev, 1);
5172 }
5173 addrconf_ifdown(init_net.loopback_dev, 2);
5174
1da177e4
LT		 5175 /*
5176 * Check hash table.
5177 */
5c578aed 5178 spin_lock_bh(&addrconf_hash_lock);
c2e21293 5179 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5180 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 5181 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 5182
5183 del_timer(&addr_chk_timer);
1da177e4 5184 rtnl_unlock();
1da177e4 5185}
Linux kernel - Deliverables
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