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Merge branch 'linus' into timers/core
[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
888c848e 172static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 173 .forwarding = 0,
174 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
175 .mtu6 = IPV6_MIN_MTU,
176 .accept_ra = 1,
177 .accept_redirects = 1,
178 .autoconf = 1,
179 .force_mld_version = 0,
180 .dad_transmits = 1,
181 .rtr_solicits = MAX_RTR_SOLICITATIONS,
182 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
183 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
184#ifdef CONFIG_IPV6_PRIVACY
185 .use_tempaddr = 0,
186 .temp_valid_lft = TEMP_VALID_LIFETIME,
187 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
188 .regen_max_retry = REGEN_MAX_RETRY,
189 .max_desync_factor = MAX_DESYNC_FACTOR,
190#endif
191 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 192 .accept_ra_defrtr = 1,
c4fd30eb 193 .accept_ra_pinfo = 1,
930d6ff2
YH		 194#ifdef CONFIG_IPV6_ROUTER_PREF
195 .accept_ra_rtr_pref = 1,
52e16356 196 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 197#ifdef CONFIG_IPV6_ROUTE_INFO
198 .accept_ra_rt_info_max_plen = 0,
199#endif
930d6ff2 200#endif
fbea49e1 201 .proxy_ndp = 0,
0bcbc926 202 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 203 .disable_ipv6 = 0,
1b34be74 204 .accept_dad = 1,
1da177e4
LT		 205};
206
ab32ea5d 207static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 208 .forwarding = 0,
209 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
210 .mtu6 = IPV6_MIN_MTU,
211 .accept_ra = 1,
212 .accept_redirects = 1,
213 .autoconf = 1,
214 .dad_transmits = 1,
215 .rtr_solicits = MAX_RTR_SOLICITATIONS,
216 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
217 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
218#ifdef CONFIG_IPV6_PRIVACY
219 .use_tempaddr = 0,
220 .temp_valid_lft = TEMP_VALID_LIFETIME,
221 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
222 .regen_max_retry = REGEN_MAX_RETRY,
223 .max_desync_factor = MAX_DESYNC_FACTOR,
224#endif
225 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 226 .accept_ra_defrtr = 1,
c4fd30eb 227 .accept_ra_pinfo = 1,
930d6ff2
YH		 228#ifdef CONFIG_IPV6_ROUTER_PREF
229 .accept_ra_rtr_pref = 1,
52e16356 230 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 231#ifdef CONFIG_IPV6_ROUTE_INFO
232 .accept_ra_rt_info_max_plen = 0,
233#endif
930d6ff2 234#endif
fbea49e1 235 .proxy_ndp = 0,
0bcbc926 236 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 237 .disable_ipv6 = 0,
1b34be74 238 .accept_dad = 1,
1da177e4
LT		 239};
240
241/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 242const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4 243const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
f3ee4010
YH		 244const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
245const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
2c5e8933
HFS		 246const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
247const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
248const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
1da177e4 249
f24e3d65 250/* Check if a valid qdisc is available */
05297949 251static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 252{
05297949 253 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 254}
255
b7b1bfce 256static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 257{
b7b1bfce
HFS		 258 if (del_timer(&idev->rs_timer))
259 __in6_dev_put(idev);
260}
261
262static void addrconf_del_dad_timer(struct inet6_ifaddr *ifp)
263{
264 if (del_timer(&ifp->dad_timer))
1da177e4
LT		 265 __in6_ifa_put(ifp);
266}
267
b7b1bfce
HFS		 268static void addrconf_mod_rs_timer(struct inet6_dev *idev,
269 unsigned long when)
270{
271 if (!timer_pending(&idev->rs_timer))
272 in6_dev_hold(idev);
273 mod_timer(&idev->rs_timer, jiffies + when);
274}
1da177e4 275
b7b1bfce
HFS		 276static void addrconf_mod_dad_timer(struct inet6_ifaddr *ifp,
277 unsigned long when)
1da177e4 278{
b7b1bfce 279 if (!timer_pending(&ifp->dad_timer))
1da177e4 280 in6_ifa_hold(ifp);
b7b1bfce 281 mod_timer(&ifp->dad_timer, jiffies + when);
1da177e4
LT		 282}
283
7f7d9a6b
HX		 284static int snmp6_alloc_dev(struct inet6_dev *idev)
285{
7d720c3e 286 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
1823e4c8
ED		 287 sizeof(struct ipstats_mib),
288 __alignof__(struct ipstats_mib)) < 0)
7f7d9a6b 289 goto err_ip;
be281e55
ED		 290 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
291 GFP_KERNEL);
292 if (!idev->stats.icmpv6dev)
7f7d9a6b 293 goto err_icmp;
be281e55
ED		 294 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
295 GFP_KERNEL);
296 if (!idev->stats.icmpv6msgdev)
14878f75 297 goto err_icmpmsg;
7f7d9a6b
HX		 298
299 return 0;
300
14878f75 301err_icmpmsg:
be281e55 302 kfree(idev->stats.icmpv6dev);
7f7d9a6b 303err_icmp:
7d720c3e 304 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b 305err_ip:
aaf70ec7 306 return -ENOMEM;
7f7d9a6b
HX		 307}
308
16910b98 309static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 310{
be281e55
ED		 311 kfree(idev->stats.icmpv6msgdev);
312 kfree(idev->stats.icmpv6dev);
7d720c3e 313 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b
HX		 314}
315
1da177e4
LT		 316/* Nobody refers to this device, we may destroy it. */
317
318void in6_dev_finish_destroy(struct inet6_dev *idev)
319{
320 struct net_device *dev = idev->dev;
547b792c 321
502a2ffd 322 WARN_ON(!list_empty(&idev->addr_list));
547b792c 323 WARN_ON(idev->mc_list != NULL);
b7b1bfce 324 WARN_ON(timer_pending(&idev->rs_timer));
547b792c 325
1da177e4 326#ifdef NET_REFCNT_DEBUG
91df42be 327 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
1da177e4
LT		 328#endif
329 dev_put(dev);
330 if (!idev->dead) {
f3213831 331 pr_warn("Freeing alive inet6 device %p\n", idev);
1da177e4
LT		 332 return;
333 }
334 snmp6_free_dev(idev);
38f57d1a 335 kfree_rcu(idev, rcu);
1da177e4 336}
7159039a
YH		 337EXPORT_SYMBOL(in6_dev_finish_destroy);
338
8e5e8f30 339static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 340{
341 struct inet6_dev *ndev;
342
343 ASSERT_RTNL();
344
345 if (dev->mtu < IPV6_MIN_MTU)
346 return NULL;
347
1ab1457c 348 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 349
1ab1457c
YH		 350 if (ndev == NULL)
351 return NULL;
322f74a4
IO		 352
353 rwlock_init(&ndev->lock);
354 ndev->dev = dev;
502a2ffd 355 INIT_LIST_HEAD(&ndev->addr_list);
b7b1bfce
HFS		 356 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
357 (unsigned long)ndev);
c346dca1 358 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 359 ndev->cnf.mtu6 = dev->mtu;
360 ndev->cnf.sysctl = NULL;
361 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
362 if (ndev->nd_parms == NULL) {
363 kfree(ndev);
364 return NULL;
365 }
0187bdfb
BH		 366 if (ndev->cnf.forwarding)
367 dev_disable_lro(dev);
322f74a4
IO		 368 /* We refer to the device */
369 dev_hold(dev);
1da177e4 370
322f74a4
IO		 371 if (snmp6_alloc_dev(ndev) < 0) {
372 ADBG((KERN_WARNING
f3213831 373 "%s: cannot allocate memory for statistics; dev=%s.\n",
0dc47877 374 __func__, dev->name));
322f74a4 375 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 376 dev_put(dev);
377 kfree(ndev);
322f74a4
IO		 378 return NULL;
379 }
1da177e4 380
322f74a4
IO		 381 if (snmp6_register_dev(ndev) < 0) {
382 ADBG((KERN_WARNING
f3213831 383 "%s: cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 384 __func__, dev->name));
322f74a4
IO		 385 neigh_parms_release(&nd_tbl, ndev->nd_parms);
386 ndev->dead = 1;
387 in6_dev_finish_destroy(ndev);
388 return NULL;
389 }
390
391 /* One reference from device. We must do this before
392 * we invoke __ipv6_regen_rndid().
393 */
394 in6_dev_hold(ndev);
1da177e4 395
1b34be74
YH		 396 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
397 ndev->cnf.accept_dad = -1;
398
07a93626 399#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 400 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 401 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 402 ndev->cnf.rtr_solicits = 0;
403 }
404#endif
405
1da177e4 406#ifdef CONFIG_IPV6_PRIVACY
372e6c8f 407 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 408 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 409 if ((dev->flags&IFF_LOOPBACK) ||
410 dev->type == ARPHRD_TUNNEL ||
9625ed72 411 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 412 dev->type == ARPHRD_SIT ||
0be669bb 413 dev->type == ARPHRD_NONE) {
322f74a4
IO		 414 ndev->cnf.use_tempaddr = -1;
415 } else {
416 in6_dev_hold(ndev);
417 ipv6_regen_rndid((unsigned long) ndev);
418 }
1da177e4 419#endif
914faa14 420 ndev->token = in6addr_any;
1da177e4 421
f24e3d65 422 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 423 ndev->if_flags |= IF_READY;
424
322f74a4
IO		 425 ipv6_mc_init_dev(ndev);
426 ndev->tstamp = jiffies;
f52295a9 427 addrconf_sysctl_register(ndev);
30c4cf57 428 /* protected by rtnl_lock */
cf778b00 429 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 430
2c5e8933
HFS		 431 /* Join interface-local all-node multicast group */
432 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
433
d88ae4cc 434 /* Join all-node multicast group */
f3ee4010 435 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 436
d6ddef9e 437 /* Join all-router multicast group if forwarding is set */
8b2aaede 438 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 439 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
440
1da177e4
LT		 441 return ndev;
442}
443
8e5e8f30 444static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 445{
446 struct inet6_dev *idev;
447
448 ASSERT_RTNL();
449
e21e8467
SH		 450 idev = __in6_dev_get(dev);
451 if (!idev) {
452 idev = ipv6_add_dev(dev);
453 if (!idev)
1da177e4
LT		 454 return NULL;
455 }
c5e33bdd 456
1da177e4
LT		 457 if (dev->flags&IFF_UP)
458 ipv6_mc_up(idev);
459 return idev;
460}
461
f3a1bfb1
ND		 462static int inet6_netconf_msgsize_devconf(int type)
463{
464 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
465 + nla_total_size(4); /* NETCONFA_IFINDEX */
466
76f8f6cb
ND		 467 /* type -1 is used for ALL */
468 if (type == -1 || type == NETCONFA_FORWARDING)
f3a1bfb1 469 size += nla_total_size(4);
b1afce95 470#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 471 if (type == -1 || type == NETCONFA_MC_FORWARDING)
472 size += nla_total_size(4);
b1afce95 473#endif
f3a1bfb1
ND		 474
475 return size;
476}
477
478static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
479 struct ipv6_devconf *devconf, u32 portid,
480 u32 seq, int event, unsigned int flags,
481 int type)
482{
483 struct nlmsghdr *nlh;
484 struct netconfmsg *ncm;
485
486 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
487 flags);
488 if (nlh == NULL)
489 return -EMSGSIZE;
490
491 ncm = nlmsg_data(nlh);
492 ncm->ncm_family = AF_INET6;
493
494 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
495 goto nla_put_failure;
496
76f8f6cb
ND		 497 /* type -1 is used for ALL */
498 if ((type == -1 || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 499 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
500 goto nla_put_failure;
b1afce95 501#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 502 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
503 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
504 devconf->mc_forwarding) < 0)
505 goto nla_put_failure;
b1afce95 506#endif
f3a1bfb1
ND		 507 return nlmsg_end(skb, nlh);
508
509nla_put_failure:
510 nlmsg_cancel(skb, nlh);
511 return -EMSGSIZE;
512}
513
d67b8c61
ND		 514void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
515 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 516{
517 struct sk_buff *skb;
518 int err = -ENOBUFS;
519
520 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
521 if (skb == NULL)
522 goto errout;
523
524 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
525 RTM_NEWNETCONF, 0, type);
526 if (err < 0) {
527 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
528 WARN_ON(err == -EMSGSIZE);
529 kfree_skb(skb);
530 goto errout;
531 }
532 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
533 return;
534errout:
bd779028 535 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 536}
537
76f8f6cb
ND		 538static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
539 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
540 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
541};
542
543static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 544 struct nlmsghdr *nlh)
76f8f6cb
ND		 545{
546 struct net *net = sock_net(in_skb->sk);
547 struct nlattr *tb[NETCONFA_MAX+1];
548 struct netconfmsg *ncm;
549 struct sk_buff *skb;
550 struct ipv6_devconf *devconf;
551 struct inet6_dev *in6_dev;
552 struct net_device *dev;
553 int ifindex;
554 int err;
555
556 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
557 devconf_ipv6_policy);
558 if (err < 0)
559 goto errout;
560
561 err = EINVAL;
562 if (!tb[NETCONFA_IFINDEX])
563 goto errout;
564
565 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
566 switch (ifindex) {
567 case NETCONFA_IFINDEX_ALL:
568 devconf = net->ipv6.devconf_all;
569 break;
570 case NETCONFA_IFINDEX_DEFAULT:
571 devconf = net->ipv6.devconf_dflt;
572 break;
573 default:
574 dev = __dev_get_by_index(net, ifindex);
575 if (dev == NULL)
576 goto errout;
577 in6_dev = __in6_dev_get(dev);
578 if (in6_dev == NULL)
579 goto errout;
580 devconf = &in6_dev->cnf;
581 break;
582 }
583
584 err = -ENOBUFS;
585 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
586 if (skb == NULL)
587 goto errout;
588
589 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
590 NETLINK_CB(in_skb).portid,
591 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
592 -1);
593 if (err < 0) {
594 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
595 WARN_ON(err == -EMSGSIZE);
596 kfree_skb(skb);
597 goto errout;
598 }
599 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
600errout:
601 return err;
602}
603
7a674200
ND		 604static int inet6_netconf_dump_devconf(struct sk_buff *skb,
605 struct netlink_callback *cb)
606{
607 struct net *net = sock_net(skb->sk);
608 int h, s_h;
609 int idx, s_idx;
610 struct net_device *dev;
611 struct inet6_dev *idev;
612 struct hlist_head *head;
613
614 s_h = cb->args[0];
615 s_idx = idx = cb->args[1];
616
617 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
618 idx = 0;
619 head = &net->dev_index_head[h];
620 rcu_read_lock();
63998ac2
ND		 621 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
622 net->dev_base_seq;
7a674200
ND		 623 hlist_for_each_entry_rcu(dev, head, index_hlist) {
624 if (idx < s_idx)
625 goto cont;
626 idev = __in6_dev_get(dev);
627 if (!idev)
628 goto cont;
629
630 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
631 &idev->cnf,
632 NETLINK_CB(cb->skb).portid,
633 cb->nlh->nlmsg_seq,
634 RTM_NEWNETCONF,
635 NLM_F_MULTI,
636 -1) <= 0) {
637 rcu_read_unlock();
638 goto done;
639 }
63998ac2 640 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 641cont:
642 idx++;
643 }
644 rcu_read_unlock();
645 }
646 if (h == NETDEV_HASHENTRIES) {
647 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
648 net->ipv6.devconf_all,
649 NETLINK_CB(cb->skb).portid,
650 cb->nlh->nlmsg_seq,
651 RTM_NEWNETCONF, NLM_F_MULTI,
652 -1) <= 0)
653 goto done;
654 else
655 h++;
656 }
657 if (h == NETDEV_HASHENTRIES + 1) {
658 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
659 net->ipv6.devconf_dflt,
660 NETLINK_CB(cb->skb).portid,
661 cb->nlh->nlmsg_seq,
662 RTM_NEWNETCONF, NLM_F_MULTI,
663 -1) <= 0)
664 goto done;
665 else
666 h++;
667 }
668done:
669 cb->args[0] = h;
670 cb->args[1] = idx;
671
672 return skb->len;
673}
674
1da177e4
LT		 675#ifdef CONFIG_SYSCTL
676static void dev_forward_change(struct inet6_dev *idev)
677{
678 struct net_device *dev;
679 struct inet6_ifaddr *ifa;
1da177e4
LT		 680
681 if (!idev)
682 return;
683 dev = idev->dev;
0187bdfb
BH		 684 if (idev->cnf.forwarding)
685 dev_disable_lro(dev);
1a940835 686 if (dev->flags & IFF_MULTICAST) {
2c5e8933 687 if (idev->cnf.forwarding) {
f3ee4010 688 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 689 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
690 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
691 } else {
f3ee4010 692 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 693 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
694 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
695 }
1da177e4 696 }
502a2ffd 697
698 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 699 if (ifa->flags&IFA_F_TENTATIVE)
700 continue;
1da177e4
LT		 701 if (idev->cnf.forwarding)
702 addrconf_join_anycast(ifa);
703 else
704 addrconf_leave_anycast(ifa);
705 }
f3a1bfb1
ND		 706 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
707 dev->ifindex, &idev->cnf);
1da177e4
LT		 708}
709
710
e186932b 711static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 712{
713 struct net_device *dev;
714 struct inet6_dev *idev;
715
4acd4945 716 for_each_netdev(net, dev) {
1da177e4
LT		 717 idev = __in6_dev_get(dev);
718 if (idev) {
e186932b
PE		 719 int changed = (!idev->cnf.forwarding) ^ (!newf);
720 idev->cnf.forwarding = newf;
1da177e4
LT		 721 if (changed)
722 dev_forward_change(idev);
723 }
1da177e4 724 }
1da177e4 725}
c8fecf22 726
013d97e9 727static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 728{
bff16c2f 729 struct net *net;
013d97e9
FR		 730 int old;
731
732 if (!rtnl_trylock())
733 return restart_syscall();
bff16c2f
PE		 734
735 net = (struct net *)table->extra2;
013d97e9
FR		 736 old = *p;
737 *p = newf;
b325fddb 738
013d97e9 739 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 740 if ((!newf) ^ (!old))
741 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
742 NETCONFA_IFINDEX_DEFAULT,
743 net->ipv6.devconf_dflt);
013d97e9
FR		 744 rtnl_unlock();
745 return 0;
88af182e 746 }
c8fecf22 747
e186932b 748 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 749 net->ipv6.devconf_dflt->forwarding = newf;
750 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 751 if ((!newf) ^ (!old))
752 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
753 NETCONFA_IFINDEX_ALL,
754 net->ipv6.devconf_all);
013d97e9 755 } else if ((!newf) ^ (!old))
c8fecf22 756 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 757 rtnl_unlock();
c8fecf22 758
013d97e9 759 if (newf)
7b4da532 760 rt6_purge_dflt_routers(net);
b325fddb 761 return 1;
c8fecf22 762}
1da177e4
LT		 763#endif
764
5c578aed 765/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 766void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
767{
c2e21293 768 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 769
1da177e4 770#ifdef NET_REFCNT_DEBUG
91df42be 771 pr_debug("%s\n", __func__);
1da177e4
LT		 772#endif
773
774 in6_dev_put(ifp->idev);
775
b7b1bfce 776 if (del_timer(&ifp->dad_timer))
e21e8467 777 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
1da177e4 778
e9d3e084 779 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 780 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 781 return;
782 }
94e187c0 783 ip6_rt_put(ifp->rt);
1da177e4 784
e5785985 785 kfree_rcu(ifp, rcu);
1da177e4
LT		 786}
787
e55ffac6
BH		 788static void
789ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
790{
502a2ffd 791 struct list_head *p;
8a6ce0c0 792 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 793
794 /*
795 * Each device address list is sorted in order of scope -
796 * global before linklocal.
797 */
502a2ffd 798 list_for_each(p, &idev->addr_list) {
799 struct inet6_ifaddr *ifa
800 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 801 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 802 break;
803 }
804
b54c9b98 805 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 806}
807
ddbe5032 808static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 809{
ddbe5032 810 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 811}
812
1da177e4
LT		 813/* On success it returns ifp with increased reference count */
814
815static struct inet6_ifaddr *
3f8f5298
JP		 816ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
817 const struct in6_addr *peer_addr, int pfxlen,
8a226b2c 818 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
1da177e4
LT		 819{
820 struct inet6_ifaddr *ifa = NULL;
821 struct rt6_info *rt;
3a88a81d 822 unsigned int hash;
1da177e4 823 int err = 0;
d68b8270
YH		 824 int addr_type = ipv6_addr_type(addr);
825
826 if (addr_type == IPV6_ADDR_ANY ||
827 addr_type & IPV6_ADDR_MULTICAST ||
828 (!(idev->dev->flags & IFF_LOOPBACK) &&
829 addr_type & IPV6_ADDR_LOOPBACK))
830 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 831
8814c4b5 832 rcu_read_lock_bh();
1da177e4
LT		 833 if (idev->dead) {
834 err = -ENODEV; /*XXX*/
835 goto out2;
836 }
837
56d417b1 838 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 839 err = -EACCES;
840 goto out2;
841 }
842
5c578aed 843 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 844
845 /* Ignore adding duplicate addresses on an interface */
c346dca1 846 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 847 ADBG(("ipv6_add_addr: already assigned\n"));
848 err = -EEXIST;
849 goto out;
850 }
851
322f74a4 852 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 853
854 if (ifa == NULL) {
855 ADBG(("ipv6_add_addr: malloc failed\n"));
856 err = -ENOBUFS;
857 goto out;
858 }
859
8f031519 860 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 861 if (IS_ERR(rt)) {
862 err = PTR_ERR(rt);
863 goto out;
864 }
865
4e3fd7a0 866 ifa->addr = *addr;
3f8f5298
JP		 867 if (peer_addr)
868 ifa->peer_addr = *peer_addr;
1da177e4
LT		 869
870 spin_lock_init(&ifa->lock);
e9d3e084 871 spin_lock_init(&ifa->state_lock);
b7b1bfce
HFS		 872 setup_timer(&ifa->dad_timer, addrconf_dad_timer,
873 (unsigned long)ifa);
c2e21293 874 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 875 ifa->scope = scope;
876 ifa->prefix_len = pfxlen;
877 ifa->flags = flags | IFA_F_TENTATIVE;
8a226b2c
JB		 878 ifa->valid_lft = valid_lft;
879 ifa->prefered_lft = prefered_lft;
1da177e4 880 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 881 ifa->tokenized = false;
1da177e4 882
57f5f544
KF		 883 ifa->rt = rt;
884
1da177e4
LT		 885 ifa->idev = idev;
886 in6_dev_hold(idev);
887 /* For caller */
888 in6_ifa_hold(ifa);
889
890 /* Add to big hash table */
ddbe5032 891 hash = inet6_addr_hash(addr);
1da177e4 892
5c578aed 893 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 894 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 895
896 write_lock(&idev->lock);
897 /* Add to inet6_dev unicast addr list. */
e55ffac6 898 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 899
900#ifdef CONFIG_IPV6_PRIVACY
901 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 902 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 903 in6_ifa_hold(ifa);
904 }
905#endif
906
1da177e4
LT		 907 in6_ifa_hold(ifa);
908 write_unlock(&idev->lock);
909out2:
8814c4b5 910 rcu_read_unlock_bh();
1da177e4 911
fd92833a 912 if (likely(err == 0))
f88c91dd 913 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 914 else {
915 kfree(ifa);
916 ifa = ERR_PTR(err);
917 }
918
919 return ifa;
920out:
5c578aed 921 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 922 goto out2;
923}
924
925/* This function wants to get referenced ifp and releases it before return */
926
927static void ipv6_del_addr(struct inet6_ifaddr *ifp)
928{
502a2ffd 929 struct inet6_ifaddr *ifa, *ifn;
1da177e4 930 struct inet6_dev *idev = ifp->idev;
4c5ff6a6 931 int state;
1da177e4
LT		 932 int deleted = 0, onlink = 0;
933 unsigned long expires = jiffies;
934
4c5ff6a6
HX		 935 spin_lock_bh(&ifp->state_lock);
936 state = ifp->state;
e9d3e084 937 ifp->state = INET6_IFADDR_STATE_DEAD;
4c5ff6a6
HX		 938 spin_unlock_bh(&ifp->state_lock);
939
940 if (state == INET6_IFADDR_STATE_DEAD)
941 goto out;
1da177e4 942
5c578aed 943 spin_lock_bh(&addrconf_hash_lock);
944 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 945 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 946
947 write_lock_bh(&idev->lock);
948#ifdef CONFIG_IPV6_PRIVACY
949 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 950 list_del(&ifp->tmp_list);
951 if (ifp->ifpub) {
952 in6_ifa_put(ifp->ifpub);
953 ifp->ifpub = NULL;
1da177e4 954 }
372e6c8f 955 __in6_ifa_put(ifp);
1da177e4
LT		 956 }
957#endif
958
502a2ffd 959 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
1da177e4 960 if (ifa == ifp) {
502a2ffd 961 list_del_init(&ifp->if_list);
1da177e4 962 __in6_ifa_put(ifp);
502a2ffd 963
1da177e4
LT		 964 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
965 break;
966 deleted = 1;
1d142804 967 continue;
1da177e4
LT		 968 } else if (ifp->flags & IFA_F_PERMANENT) {
969 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
970 ifp->prefix_len)) {
971 if (ifa->flags & IFA_F_PERMANENT) {
972 onlink = 1;
973 if (deleted)
974 break;
975 } else {
976 unsigned long lifetime;
977
978 if (!onlink)
979 onlink = -1;
980
981 spin_lock(&ifa->lock);
4bed72e4
YH		 982
983 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
984 /*
985 * Note: Because this address is
986 * not permanent, lifetime <
987 * LONG_MAX / HZ here.
988 */
1da177e4
LT		 989 if (time_before(expires,
990 ifa->tstamp + lifetime * HZ))
991 expires = ifa->tstamp + lifetime * HZ;
992 spin_unlock(&ifa->lock);
993 }
994 }
995 }
996 }
997 write_unlock_bh(&idev->lock);
998
b7b1bfce 999 addrconf_del_dad_timer(ifp);
b2238566 1000
1da177e4
LT		 1001 ipv6_ifa_notify(RTM_DELADDR, ifp);
1002
f88c91dd 1003 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1004
1da177e4
LT		 1005 /*
1006 * Purge or update corresponding prefix
1007 *
1008 * 1) we don't purge prefix here if address was not permanent.
1009 * prefix is managed by its own lifetime.
1010 * 2) if there're no addresses, delete prefix.
1011 * 3) if there're still other permanent address(es),
1012 * corresponding prefix is still permanent.
1013 * 4) otherwise, update prefix lifetime to the
1014 * longest valid lifetime among the corresponding
1015 * addresses on the device.
1016 * Note: subsequent RA will update lifetime.
1017 *
1018 * --yoshfuji
1019 */
1020 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
1021 struct in6_addr prefix;
1022 struct rt6_info *rt;
64c6d08e 1023
1da177e4 1024 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
1da177e4 1025
21caa662
RK		 1026 rt = addrconf_get_prefix_route(&prefix,
1027 ifp->prefix_len,
1028 ifp->idev->dev,
1029 0, RTF_GATEWAY | RTF_DEFAULT);
1030
1031 if (rt) {
1da177e4 1032 if (onlink == 0) {
e0a1ad73 1033 ip6_del_rt(rt);
1da177e4
LT		 1034 rt = NULL;
1035 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1716a961 1036 rt6_set_expires(rt, expires);
1da177e4
LT		 1037 }
1038 }
94e187c0 1039 ip6_rt_put(rt);
1da177e4
LT		 1040 }
1041
c3968a85
DW		 1042 /* clean up prefsrc entries */
1043 rt6_remove_prefsrc(ifp);
4c5ff6a6 1044out:
1da177e4
LT		 1045 in6_ifa_put(ifp);
1046}
1047
1048#ifdef CONFIG_IPV6_PRIVACY
1049static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1050{
1051 struct inet6_dev *idev = ifp->idev;
1052 struct in6_addr addr, *tmpaddr;
76f793e3 1053 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1054 unsigned long regen_advance;
1da177e4
LT		 1055 int tmp_plen;
1056 int ret = 0;
1057 int max_addresses;
95c385b4 1058 u32 addr_flags;
76f793e3 1059 unsigned long now = jiffies;
1da177e4
LT		 1060
1061 write_lock(&idev->lock);
1062 if (ift) {
1063 spin_lock_bh(&ift->lock);
1064 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1065 spin_unlock_bh(&ift->lock);
1066 tmpaddr = &addr;
1067 } else {
1068 tmpaddr = NULL;
1069 }
1070retry:
1071 in6_dev_hold(idev);
1072 if (idev->cnf.use_tempaddr <= 0) {
1073 write_unlock(&idev->lock);
f3213831 1074 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1075 in6_dev_put(idev);
1076 ret = -1;
1077 goto out;
1078 }
1079 spin_lock_bh(&ifp->lock);
1080 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1081 idev->cnf.use_tempaddr = -1; /*XXX*/
1082 spin_unlock_bh(&ifp->lock);
1083 write_unlock(&idev->lock);
f3213831
JP		 1084 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1085 __func__);
1da177e4
LT		 1086 in6_dev_put(idev);
1087 ret = -1;
1088 goto out;
1089 }
1090 in6_ifa_hold(ifp);
1091 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 1092 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1093 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1094 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 1095 tmp_valid_lft = min_t(__u32,
1096 ifp->valid_lft,
7a876b0e 1097 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 1098 tmp_prefered_lft = min_t(__u32,
1099 ifp->prefered_lft,
7a876b0e 1100 idev->cnf.temp_prefered_lft + age -
784e2710 1101 idev->cnf.max_desync_factor);
1da177e4
LT		 1102 tmp_plen = ifp->prefix_len;
1103 max_addresses = idev->cnf.max_addresses;
1da177e4
LT		 1104 tmp_tstamp = ifp->tstamp;
1105 spin_unlock_bh(&ifp->lock);
1106
eac55bf9
BB		 1107 regen_advance = idev->cnf.regen_max_retry *
1108 idev->cnf.dad_transmits *
1109 idev->nd_parms->retrans_time / HZ;
1da177e4 1110 write_unlock(&idev->lock);
95c385b4 1111
eac55bf9
BB		 1112 /* A temporary address is created only if this calculated Preferred
1113 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1114 * an implementation must not create a temporary address with a zero
1115 * Preferred Lifetime.
1116 */
1117 if (tmp_prefered_lft <= regen_advance) {
1118 in6_ifa_put(ifp);
1119 in6_dev_put(idev);
1120 ret = -1;
1121 goto out;
1122 }
1123
95c385b4
NH		 1124 addr_flags = IFA_F_TEMPORARY;
1125 /* set in addrconf_prefix_rcv() */
1126 if (ifp->flags & IFA_F_OPTIMISTIC)
1127 addr_flags |= IFA_F_OPTIMISTIC;
1128
1da177e4 1129 ift = !max_addresses ||
1ab1457c 1130 ipv6_count_addresses(idev) < max_addresses ?
3f8f5298 1131 ipv6_add_addr(idev, &addr, NULL, tmp_plen,
8a226b2c
JB		 1132 ipv6_addr_scope(&addr), addr_flags,
1133 tmp_valid_lft, tmp_prefered_lft) : NULL;
3f0d2ba0 1134 if (IS_ERR_OR_NULL(ift)) {
1da177e4
LT		 1135 in6_ifa_put(ifp);
1136 in6_dev_put(idev);
f3213831 1137 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4
LT		 1138 tmpaddr = &addr;
1139 write_lock(&idev->lock);
1140 goto retry;
1141 }
1142
1143 spin_lock_bh(&ift->lock);
1144 ift->ifpub = ifp;
76f793e3 1145 ift->cstamp = now;
1da177e4
LT		 1146 ift->tstamp = tmp_tstamp;
1147 spin_unlock_bh(&ift->lock);
1148
cf22f9a2 1149 addrconf_dad_start(ift);
1da177e4
LT		 1150 in6_ifa_put(ift);
1151 in6_dev_put(idev);
1152out:
1153 return ret;
1154}
1155#endif
1156
1157/*
072047e4 1158 * Choose an appropriate source address (RFC3484)
1da177e4 1159 */
a9b05723
YH		 1160enum {
1161 IPV6_SADDR_RULE_INIT = 0,
1162 IPV6_SADDR_RULE_LOCAL,
1163 IPV6_SADDR_RULE_SCOPE,
1164 IPV6_SADDR_RULE_PREFERRED,
1165#ifdef CONFIG_IPV6_MIP6
1166 IPV6_SADDR_RULE_HOA,
1167#endif
1168 IPV6_SADDR_RULE_OIF,
1169 IPV6_SADDR_RULE_LABEL,
1170#ifdef CONFIG_IPV6_PRIVACY
1171 IPV6_SADDR_RULE_PRIVACY,
1172#endif
1173 IPV6_SADDR_RULE_ORCHID,
1174 IPV6_SADDR_RULE_PREFIX,
1175 IPV6_SADDR_RULE_MAX
1176};
1177
072047e4 1178struct ipv6_saddr_score {
a9b05723
YH		 1179 int rule;
1180 int addr_type;
1181 struct inet6_ifaddr *ifa;
1182 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1183 int scopedist;
1184 int matchlen;
072047e4
YH		 1185};
1186
a9b05723 1187struct ipv6_saddr_dst {
9acd9f3a 1188 const struct in6_addr *addr;
a9b05723
YH		 1189 int ifindex;
1190 int scope;
1191 int label;
7cbca67c 1192 unsigned int prefs;
a9b05723 1193};
072047e4 1194
b6f99a21 1195static inline int ipv6_saddr_preferred(int type)
1da177e4 1196{
45bb0060 1197 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1198 return 1;
1199 return 0;
1da177e4
LT		 1200}
1201
3de23255
BT		 1202static int ipv6_get_saddr_eval(struct net *net,
1203 struct ipv6_saddr_score *score,
a9b05723
YH		 1204 struct ipv6_saddr_dst *dst,
1205 int i)
1206{
1207 int ret;
1208
1209 if (i <= score->rule) {
1210 switch (i) {
1211 case IPV6_SADDR_RULE_SCOPE:
1212 ret = score->scopedist;
1213 break;
1214 case IPV6_SADDR_RULE_PREFIX:
1215 ret = score->matchlen;
1216 break;
1217 default:
1218 ret = !!test_bit(i, score->scorebits);
1219 }
1220 goto out;
1221 }
1222
1223 switch (i) {
1224 case IPV6_SADDR_RULE_INIT:
1225 /* Rule 0: remember if hiscore is not ready yet */
1226 ret = !!score->ifa;
1227 break;
1228 case IPV6_SADDR_RULE_LOCAL:
1229 /* Rule 1: Prefer same address */
1230 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1231 break;
1232 case IPV6_SADDR_RULE_SCOPE:
1233 /* Rule 2: Prefer appropriate scope
1234 *
1235 * ret
1236 * ^
1237 * -1 | d 15
1238 * ---+--+-+---> scope
1239 * |
1240 * | d is scope of the destination.
1241 * B-d | \
1242 * | \ <- smaller scope is better if
1243 * B-15 | \ if scope is enough for destinaion.
1244 * | ret = B - scope (-1 <= scope >= d <= 15).
1245 * d-C-1 | /
1246 * |/ <- greater is better
1247 * -C / if scope is not enough for destination.
1248 * /| ret = scope - C (-1 <= d < scope <= 15).
1249 *
1250 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1251 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1252 * Assume B = 0 and we get C > 29.
1253 */
1254 ret = __ipv6_addr_src_scope(score->addr_type);
1255 if (ret >= dst->scope)
1256 ret = -ret;
1257 else
1258 ret -= 128; /* 30 is enough */
1259 score->scopedist = ret;
1260 break;
1261 case IPV6_SADDR_RULE_PREFERRED:
1262 /* Rule 3: Avoid deprecated and optimistic addresses */
1263 ret = ipv6_saddr_preferred(score->addr_type) ||
1264 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1265 break;
1266#ifdef CONFIG_IPV6_MIP6
1267 case IPV6_SADDR_RULE_HOA:
7cbca67c 1268 {
a9b05723 1269 /* Rule 4: Prefer home address */
7cbca67c
YH		 1270 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1271 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1272 break;
7cbca67c 1273 }
a9b05723
YH		 1274#endif
1275 case IPV6_SADDR_RULE_OIF:
1276 /* Rule 5: Prefer outgoing interface */
1277 ret = (!dst->ifindex ||
1278 dst->ifindex == score->ifa->idev->dev->ifindex);
1279 break;
1280 case IPV6_SADDR_RULE_LABEL:
1281 /* Rule 6: Prefer matching label */
3de23255
BT		 1282 ret = ipv6_addr_label(net,
1283 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1284 score->ifa->idev->dev->ifindex) == dst->label;
1285 break;
1286#ifdef CONFIG_IPV6_PRIVACY
1287 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1288 {
a9b05723 1289 /* Rule 7: Prefer public address
25985edc 1290 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1291 */
7cbca67c
YH		 1292 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1293 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1294 score->ifa->idev->cnf.use_tempaddr >= 2;
1295 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1296 break;
7cbca67c 1297 }
a9b05723
YH		 1298#endif
1299 case IPV6_SADDR_RULE_ORCHID:
1300 /* Rule 8-: Prefer ORCHID vs ORCHID or
1301 * non-ORCHID vs non-ORCHID
1302 */
1303 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1304 ipv6_addr_orchid(dst->addr));
1305 break;
1306 case IPV6_SADDR_RULE_PREFIX:
1307 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1308 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1309 if (ret > score->ifa->prefix_len)
1310 ret = score->ifa->prefix_len;
1311 score->matchlen = ret;
a9b05723
YH		 1312 break;
1313 default:
1314 ret = 0;
1315 }
1316
1317 if (ret)
1318 __set_bit(i, score->scorebits);
1319 score->rule = i;
1320out:
1321 return ret;
1322}
1323
b3f644fc 1324int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1325 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1326 struct in6_addr *saddr)
1da177e4 1327{
a9b05723
YH		 1328 struct ipv6_saddr_score scores[2],
1329 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1330 struct ipv6_saddr_dst dst;
072047e4 1331 struct net_device *dev;
a9b05723 1332 int dst_type;
1da177e4 1333
a9b05723
YH		 1334 dst_type = __ipv6_addr_type(daddr);
1335 dst.addr = daddr;
1336 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1337 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1338 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1339 dst.prefs = prefs;
a9b05723
YH		 1340
1341 hiscore->rule = -1;
1342 hiscore->ifa = NULL;
1da177e4 1343
8814c4b5 1344 rcu_read_lock();
1da177e4 1345
c6d14c84 1346 for_each_netdev_rcu(net, dev) {
072047e4 1347 struct inet6_dev *idev;
072047e4 1348
a9b05723 1349 /* Candidate Source Address (section 4)
072047e4
YH		 1350 * - multicast and link-local destination address,
1351 * the set of candidate source address MUST only
1352 * include addresses assigned to interfaces
1353 * belonging to the same link as the outgoing
1354 * interface.
1355 * (- For site-local destination addresses, the
1356 * set of candidate source addresses MUST only
1357 * include addresses assigned to interfaces
1358 * belonging to the same site as the outgoing
1359 * interface.)
1360 */
a9b05723
YH		 1361 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1362 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1363 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1364 continue;
1da177e4 1365
1da177e4 1366 idev = __in6_dev_get(dev);
072047e4
YH		 1367 if (!idev)
1368 continue;
1369
1370 read_lock_bh(&idev->lock);
502a2ffd 1371 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1372 int i;
072047e4 1373
a9b05723 1374 /*
6b3ae80a
YH		 1375 * - Tentative Address (RFC2462 section 5.4)
1376 * - A tentative address is not considered
1377 * "assigned to an interface" in the traditional
95c385b4 1378 * sense, unless it is also flagged as optimistic.
6b3ae80a 1379 * - Candidate Source Address (section 4)
072047e4
YH		 1380 * - In any case, anycast addresses, multicast
1381 * addresses, and the unspecified address MUST
1382 * NOT be included in a candidate set.
1383 */
a9b05723
YH		 1384 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1385 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1386 continue;
a9b05723
YH		 1387
1388 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1389
1390 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1391 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1392 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1393 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1394 "assigned as unicast address on %s",
1395 dev->name);
1396 continue;
1397 }
1398
a9b05723
YH		 1399 score->rule = -1;
1400 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1401
1402 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1403 int minihiscore, miniscore;
1404
3de23255
BT		 1405 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1406 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1407
1408 if (minihiscore > miniscore) {
1409 if (i == IPV6_SADDR_RULE_SCOPE &&
1410 score->scopedist > 0) {
1411 /*
1412 * special case:
1413 * each remaining entry
1414 * has too small (not enough)
1415 * scope, because ifa entries
1416 * are sorted by their scope
1417 * values.
1418 */
1419 goto try_nextdev;
1420 }
1421 break;
1422 } else if (minihiscore < miniscore) {
a9b05723
YH		 1423 if (hiscore->ifa)
1424 in6_ifa_put(hiscore->ifa);
1425
1426 in6_ifa_hold(score->ifa);
1427
a0bffffc 1428 swap(hiscore, score);
a9b05723
YH		 1429
1430 /* restore our iterator */
1431 score->ifa = hiscore->ifa;
1432
1433 break;
1da177e4 1434 }
072047e4 1435 }
1da177e4 1436 }
a9b05723 1437try_nextdev:
072047e4 1438 read_unlock_bh(&idev->lock);
1da177e4 1439 }
8814c4b5 1440 rcu_read_unlock();
1da177e4 1441
a9b05723 1442 if (!hiscore->ifa)
072047e4 1443 return -EADDRNOTAVAIL;
1ab1457c 1444
4e3fd7a0 1445 *saddr = hiscore->ifa->addr;
a9b05723 1446 in6_ifa_put(hiscore->ifa);
072047e4 1447 return 0;
1da177e4 1448}
5e5f3f0f 1449EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1450
8965779d
AW		 1451int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1452 unsigned char banned_flags)
b7b1bfce
HFS		 1453{
1454 struct inet6_ifaddr *ifp;
1455 int err = -EADDRNOTAVAIL;
1456
1457 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1458 if (ifp->scope == IFA_LINK &&
1459 !(ifp->flags & banned_flags)) {
1460 *addr = ifp->addr;
1461 err = 0;
1462 break;
1463 }
1464 }
1465 return err;
1466}
1467
95c385b4
NH		 1468int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1469 unsigned char banned_flags)
1da177e4
LT		 1470{
1471 struct inet6_dev *idev;
1472 int err = -EADDRNOTAVAIL;
1473
8814c4b5 1474 rcu_read_lock();
e21e8467
SH		 1475 idev = __in6_dev_get(dev);
1476 if (idev) {
1da177e4 1477 read_lock_bh(&idev->lock);
b7b1bfce 1478 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1479 read_unlock_bh(&idev->lock);
1480 }
8814c4b5 1481 rcu_read_unlock();
1da177e4
LT		 1482 return err;
1483}
1484
1485static int ipv6_count_addresses(struct inet6_dev *idev)
1486{
1487 int cnt = 0;
1488 struct inet6_ifaddr *ifp;
1489
1490 read_lock_bh(&idev->lock);
502a2ffd 1491 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1492 cnt++;
1493 read_unlock_bh(&idev->lock);
1494 return cnt;
1495}
1496
b71d1d42 1497int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1498 const struct net_device *dev, int strict)
1da177e4 1499{
eedf042a 1500 struct inet6_ifaddr *ifp;
ddbe5032 1501 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1502
5c578aed 1503 rcu_read_lock_bh();
b67bfe0d 1504 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1505 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1506 continue;
1da177e4 1507 if (ipv6_addr_equal(&ifp->addr, addr) &&
eedf042a
SH		 1508 !(ifp->flags&IFA_F_TENTATIVE) &&
1509 (dev == NULL || ifp->idev->dev == dev ||
1510 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1511 rcu_read_unlock_bh();
1512 return 1;
1da177e4
LT		 1513 }
1514 }
5c578aed 1515
eedf042a
SH		 1516 rcu_read_unlock_bh();
1517 return 0;
1da177e4 1518}
7159039a
YH		 1519EXPORT_SYMBOL(ipv6_chk_addr);
1520
3e81c6da
DM		 1521static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1522 struct net_device *dev)
1da177e4 1523{
ddbe5032 1524 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1525 struct inet6_ifaddr *ifp;
1da177e4 1526
b67bfe0d 1527 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1528 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1529 continue;
1da177e4
LT		 1530 if (ipv6_addr_equal(&ifp->addr, addr)) {
1531 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1532 return true;
1da177e4
LT		 1533 }
1534 }
3e81c6da 1535 return false;
1da177e4
LT		 1536}
1537
b71d1d42 1538int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1539{
1540 struct inet6_dev *idev;
1541 struct inet6_ifaddr *ifa;
1542 int onlink;
1543
1544 onlink = 0;
1545 rcu_read_lock();
1546 idev = __in6_dev_get(dev);
1547 if (idev) {
1548 read_lock_bh(&idev->lock);
502a2ffd 1549 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1550 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1551 ifa->prefix_len);
1552 if (onlink)
1553 break;
1554 }
1555 read_unlock_bh(&idev->lock);
1556 }
1557 rcu_read_unlock();
1558 return onlink;
1559}
52eeeb84
YH		 1560EXPORT_SYMBOL(ipv6_chk_prefix);
1561
9acd9f3a 1562struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1563 struct net_device *dev, int strict)
1da177e4 1564{
b79d1d54 1565 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1566 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1567
5c578aed 1568 rcu_read_lock_bh();
b67bfe0d 1569 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1570 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1571 continue;
1da177e4
LT		 1572 if (ipv6_addr_equal(&ifp->addr, addr)) {
1573 if (dev == NULL || ifp->idev->dev == dev ||
1574 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1575 result = ifp;
1da177e4
LT		 1576 in6_ifa_hold(ifp);
1577 break;
1578 }
1579 }
1580 }
5c578aed 1581 rcu_read_unlock_bh();
1da177e4 1582
b79d1d54 1583 return result;
1da177e4
LT		 1584}
1585
1da177e4
LT		 1586/* Gets referenced address, destroys ifaddr */
1587
cc411d0b 1588static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1589{
1da177e4
LT		 1590 if (ifp->flags&IFA_F_PERMANENT) {
1591 spin_lock_bh(&ifp->lock);
b7b1bfce 1592 addrconf_del_dad_timer(ifp);
1da177e4 1593 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1594 if (dad_failed)
1595 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1596 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1597 if (dad_failed)
1598 ipv6_ifa_notify(0, ifp);
1da177e4
LT		 1599 in6_ifa_put(ifp);
1600#ifdef CONFIG_IPV6_PRIVACY
1601 } else if (ifp->flags&IFA_F_TEMPORARY) {
1602 struct inet6_ifaddr *ifpub;
1603 spin_lock_bh(&ifp->lock);
1604 ifpub = ifp->ifpub;
1605 if (ifpub) {
1606 in6_ifa_hold(ifpub);
1607 spin_unlock_bh(&ifp->lock);
1608 ipv6_create_tempaddr(ifpub, ifp);
1609 in6_ifa_put(ifpub);
1610 } else {
1611 spin_unlock_bh(&ifp->lock);
1612 }
1613 ipv6_del_addr(ifp);
1614#endif
1615 } else
1616 ipv6_del_addr(ifp);
1617}
1618
f2344a13
HX		 1619static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1620{
1621 int err = -ENOENT;
1622
1623 spin_lock(&ifp->state_lock);
1624 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1625 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1626 err = 0;
1627 }
1628 spin_unlock(&ifp->state_lock);
1629
1630 return err;
1631}
1632
3c21edbd
YH		 1633void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1634{
1b34be74 1635 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1636
853dc2e0
UB		 1637 if (addrconf_dad_end(ifp)) {
1638 in6_ifa_put(ifp);
f2344a13 1639 return;
853dc2e0 1640 }
f2344a13 1641
e87cc472
JP		 1642 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1643 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1644
1b34be74
YH		 1645 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1646 struct in6_addr addr;
1647
1648 addr.s6_addr32[0] = htonl(0xfe800000);
1649 addr.s6_addr32[1] = 0;
1650
1651 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1652 ipv6_addr_equal(&ifp->addr, &addr)) {
1653 /* DAD failed for link-local based on MAC address */
1654 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1655
f3213831 1656 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1657 ifp->idev->dev->name);
1b34be74
YH		 1658 }
1659 }
1660
cc411d0b 1661 addrconf_dad_stop(ifp, 1);
3c21edbd 1662}
1da177e4
LT		 1663
1664/* Join to solicited addr multicast group. */
1665
b71d1d42 1666void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1667{
1668 struct in6_addr maddr;
1669
1670 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1671 return;
1672
1673 addrconf_addr_solict_mult(addr, &maddr);
1674 ipv6_dev_mc_inc(dev, &maddr);
1675}
1676
b71d1d42 1677void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1678{
1679 struct in6_addr maddr;
1680
1681 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1682 return;
1683
1684 addrconf_addr_solict_mult(addr, &maddr);
1685 __ipv6_dev_mc_dec(idev, &maddr);
1686}
1687
20380731 1688static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1689{
1690 struct in6_addr addr;
2bda8a0c
BM		 1691 if (ifp->prefix_len == 127) /* RFC 6164 */
1692 return;
1da177e4
LT		 1693 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1694 if (ipv6_addr_any(&addr))
1695 return;
1696 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1697}
1698
20380731 1699static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1700{
1701 struct in6_addr addr;
32019e65
YH		 1702 if (ifp->prefix_len == 127) /* RFC 6164 */
1703 return;
1da177e4
LT		 1704 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1705 if (ipv6_addr_any(&addr))
1706 return;
1707 __ipv6_dev_ac_dec(ifp->idev, &addr);
1708}
1709
073a8e0e
YH		 1710static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1711{
1712 if (dev->addr_len != ETH_ALEN)
1713 return -1;
1714 memcpy(eui, dev->dev_addr, 3);
1715 memcpy(eui + 5, dev->dev_addr + 3, 3);
1716
1717 /*
1718 * The zSeries OSA network cards can be shared among various
1719 * OS instances, but the OSA cards have only one MAC address.
1720 * This leads to duplicate address conflicts in conjunction
1721 * with IPv6 if more than one instance uses the same card.
1722 *
1723 * The driver for these cards can deliver a unique 16-bit
1724 * identifier for each instance sharing the same card. It is
1725 * placed instead of 0xFFFE in the interface identifier. The
1726 * "u" bit of the interface identifier is not inverted in this
1727 * case. Hence the resulting interface identifier has local
1728 * scope according to RFC2373.
1729 */
1730 if (dev->dev_id) {
1731 eui[3] = (dev->dev_id >> 8) & 0xFF;
1732 eui[4] = dev->dev_id & 0xFF;
1733 } else {
1734 eui[3] = 0xFF;
1735 eui[4] = 0xFE;
1736 eui[0] ^= 2;
1737 }
1738 return 0;
1739}
1740
06a4c1c5 1741static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1742{
1743 if (dev->addr_len != IEEE802154_ADDR_LEN)
1744 return -1;
1745 memcpy(eui, dev->dev_addr, 8);
5e98a36e 1746 eui[0] ^= 2;
06a4c1c5 1747 return 0;
1748}
1749
cb6bf355
YH		 1750static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1751{
1752 union fwnet_hwaddr *ha;
1753
1754 if (dev->addr_len != FWNET_ALEN)
1755 return -1;
1756
1757 ha = (union fwnet_hwaddr *)dev->dev_addr;
1758
1759 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1760 eui[0] ^= 2;
1761 return 0;
1762}
1763
073a8e0e
YH		 1764static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1765{
1766 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1767 if (dev->addr_len != ARCNET_ALEN)
1768 return -1;
1769 memset(eui, 0, 7);
8e5e8f30 1770 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1771 return 0;
1772}
1773
1774static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1775{
1776 if (dev->addr_len != INFINIBAND_ALEN)
1777 return -1;
1778 memcpy(eui, dev->dev_addr + 12, 8);
1779 eui[0] |= 2;
1780 return 0;
1781}
1782
c61393ea 1783static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1784{
9af28511
SH		 1785 if (addr == 0)
1786 return -1;
dfd982ba
YH		 1787 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1788 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1789 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1790 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1791 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1792 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1793 eui[1] = 0;
1794 eui[2] = 0x5E;
1795 eui[3] = 0xFE;
1796 memcpy(eui + 4, &addr, 4);
1797 return 0;
1798}
dfd982ba
YH		 1799
1800static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1801{
1802 if (dev->priv_flags & IFF_ISATAP)
1803 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1804 return -1;
1805}
1806
aee80b54 1807static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1808{
1809 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1810}
1811
1da177e4
LT		 1812static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1813{
1814 switch (dev->type) {
1815 case ARPHRD_ETHER:
1816 case ARPHRD_FDDI:
073a8e0e 1817 return addrconf_ifid_eui48(eui, dev);
1da177e4 1818 case ARPHRD_ARCNET:
073a8e0e 1819 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1820 case ARPHRD_INFINIBAND:
073a8e0e 1821 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1822 case ARPHRD_SIT:
dfd982ba 1823 return addrconf_ifid_sit(eui, dev);
aee80b54 1824 case ARPHRD_IPGRE:
1825 return addrconf_ifid_gre(eui, dev);
06a4c1c5 1826 case ARPHRD_IEEE802154:
1827 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 1828 case ARPHRD_IEEE1394:
1829 return addrconf_ifid_ieee1394(eui, dev);
1da177e4
LT		 1830 }
1831 return -1;
1832}
1833
1834static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1835{
1836 int err = -1;
1837 struct inet6_ifaddr *ifp;
1838
1839 read_lock_bh(&idev->lock);
502a2ffd 1840 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 1841 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1842 memcpy(eui, ifp->addr.s6_addr+8, 8);
1843 err = 0;
1844 break;
1845 }
1846 }
1847 read_unlock_bh(&idev->lock);
1848 return err;
1849}
1850
1851#ifdef CONFIG_IPV6_PRIVACY
1852/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 1853static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 1854{
1da177e4 1855regen:
955189ef 1856 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1857 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1858
1859 /*
1860 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1861 * check if generated address is not inappropriate
1862 *
1863 * - Reserved subnet anycast (RFC 2526)
1864 * 11111101 11....11 1xxxxxxx
c7dc89c0 1865 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1866 * 00-00-5E-FE-xx-xx-xx-xx
1867 * - value 0
1868 * - XXX: already assigned to an address on the device
1869 */
1ab1457c 1870 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1871 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1872 (idev->rndid[7]&0x80))
1873 goto regen;
1874 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1875 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1876 goto regen;
1877 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1878 goto regen;
1879 }
1da177e4
LT		 1880}
1881
1882static void ipv6_regen_rndid(unsigned long data)
1883{
1884 struct inet6_dev *idev = (struct inet6_dev *) data;
1885 unsigned long expires;
1886
8814c4b5 1887 rcu_read_lock_bh();
1da177e4
LT		 1888 write_lock_bh(&idev->lock);
1889
1890 if (idev->dead)
1891 goto out;
1892
eb7e0575 1893 __ipv6_regen_rndid(idev);
1ab1457c 1894
1da177e4 1895 expires = jiffies +
1ab1457c 1896 idev->cnf.temp_prefered_lft * HZ -
784e2710
BH		 1897 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1898 idev->cnf.max_desync_factor * HZ;
1da177e4 1899 if (time_before(expires, jiffies)) {
f3213831
JP		 1900 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1901 __func__, idev->dev->name);
1da177e4
LT		 1902 goto out;
1903 }
1904
1905 if (!mod_timer(&idev->regen_timer, expires))
1906 in6_dev_hold(idev);
1907
1908out:
1909 write_unlock_bh(&idev->lock);
8814c4b5 1910 rcu_read_unlock_bh();
1da177e4
LT		 1911 in6_dev_put(idev);
1912}
1913
eb7e0575 1914static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 1915{
1da177e4 1916 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 1917 __ipv6_regen_rndid(idev);
1da177e4
LT		 1918}
1919#endif
1920
1921/*
1922 * Add prefix route.
1923 */
1924
1925static void
1926addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1927 unsigned long expires, u32 flags)
1da177e4 1928{
86872cb5
TG		 1929 struct fib6_config cfg = {
1930 .fc_table = RT6_TABLE_PREFIX,
1931 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1932 .fc_ifindex = dev->ifindex,
1933 .fc_expires = expires,
1934 .fc_dst_len = plen,
1935 .fc_flags = RTF_UP | flags,
c346dca1 1936 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1937 .fc_protocol = RTPROT_KERNEL,
86872cb5 1938 };
1da177e4 1939
4e3fd7a0 1940 cfg.fc_dst = *pfx;
1da177e4
LT		 1941
1942 /* Prevent useless cloning on PtP SIT.
1943 This thing is done here expecting that the whole
1944 class of non-broadcast devices need not cloning.
1945 */
07a93626 1946#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 1947 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1948 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1949#endif
1da177e4 1950
86872cb5 1951 ip6_route_add(&cfg);
1da177e4
LT		 1952}
1953
14ef37b6
AH		 1954
1955static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1956 int plen,
1957 const struct net_device *dev,
1958 u32 flags, u32 noflags)
1959{
1960 struct fib6_node *fn;
1961 struct rt6_info *rt = NULL;
1962 struct fib6_table *table;
1963
1964 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1965 if (table == NULL)
1966 return NULL;
1967
5744dd9b 1968 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 1969 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1970 if (!fn)
1971 goto out;
1972 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 1973 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 1974 continue;
1975 if ((rt->rt6i_flags & flags) != flags)
1976 continue;
85da53bf 1977 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 1978 continue;
1979 dst_hold(&rt->dst);
1980 break;
1981 }
1982out:
5744dd9b 1983 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 1984 return rt;
1985}
1986
1987
1da177e4
LT		 1988/* Create "default" multicast route to the interface */
1989
1990static void addrconf_add_mroute(struct net_device *dev)
1991{
86872cb5
TG		 1992 struct fib6_config cfg = {
1993 .fc_table = RT6_TABLE_LOCAL,
1994 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1995 .fc_ifindex = dev->ifindex,
1996 .fc_dst_len = 8,
1997 .fc_flags = RTF_UP,
c346dca1 1998 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1999 };
2000
2001 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2002
2003 ip6_route_add(&cfg);
1da177e4
LT		 2004}
2005
07a93626 2006#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2007static void sit_route_add(struct net_device *dev)
2008{
86872cb5
TG		 2009 struct fib6_config cfg = {
2010 .fc_table = RT6_TABLE_MAIN,
2011 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2012 .fc_ifindex = dev->ifindex,
2013 .fc_dst_len = 96,
2014 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 2015 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 2016 };
1da177e4
LT		 2017
2018 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 2019 ip6_route_add(&cfg);
1da177e4 2020}
0be669bb 2021#endif
1da177e4 2022
1da177e4
LT		 2023static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2024{
2025 struct inet6_dev *idev;
2026
2027 ASSERT_RTNL();
2028
e21e8467
SH		 2029 idev = ipv6_find_idev(dev);
2030 if (!idev)
64e724f6
BH		 2031 return ERR_PTR(-ENOBUFS);
2032
2033 if (idev->cnf.disable_ipv6)
2034 return ERR_PTR(-EACCES);
1da177e4
LT		 2035
2036 /* Add default multicast route */
4af04aba
LW		 2037 if (!(dev->flags & IFF_LOOPBACK))
2038 addrconf_add_mroute(dev);
1da177e4 2039
1da177e4
LT		 2040 return idev;
2041}
2042
e6bff995 2043void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2044{
2045 struct prefix_info *pinfo;
2046 __u32 valid_lft;
2047 __u32 prefered_lft;
2048 int addr_type;
1da177e4 2049 struct inet6_dev *in6_dev;
56d417b1 2050 struct net *net = dev_net(dev);
1da177e4
LT		 2051
2052 pinfo = (struct prefix_info *) opt;
1ab1457c 2053
1da177e4
LT		 2054 if (len < sizeof(struct prefix_info)) {
2055 ADBG(("addrconf: prefix option too short\n"));
2056 return;
2057 }
1ab1457c 2058
1da177e4
LT		 2059 /*
2060 * Validation checks ([ADDRCONF], page 19)
2061 */
2062
2063 addr_type = ipv6_addr_type(&pinfo->prefix);
2064
2065 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2066 return;
2067
2068 valid_lft = ntohl(pinfo->valid);
2069 prefered_lft = ntohl(pinfo->prefered);
2070
2071 if (prefered_lft > valid_lft) {
e87cc472 2072 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2073 return;
2074 }
2075
2076 in6_dev = in6_dev_get(dev);
2077
2078 if (in6_dev == NULL) {
e87cc472
JP		 2079 net_dbg_ratelimited("addrconf: device %s not configured\n",
2080 dev->name);
1da177e4
LT		 2081 return;
2082 }
2083
2084 /*
2085 * Two things going on here:
2086 * 1) Add routes for on-link prefixes
2087 * 2) Configure prefixes with the auto flag set
2088 */
2089
4bed72e4
YH		 2090 if (pinfo->onlink) {
2091 struct rt6_info *rt;
2092 unsigned long rt_expires;
2093
6f704992
YH		 2094 /* Avoid arithmetic overflow. Really, we could
2095 * save rt_expires in seconds, likely valid_lft,
2096 * but it would require division in fib gc, that it
2097 * not good.
2098 */
4bed72e4
YH		 2099 if (HZ > USER_HZ)
2100 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2101 else
2102 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2103
4bed72e4
YH		 2104 if (addrconf_finite_timeout(rt_expires))
2105 rt_expires *= HZ;
1da177e4 2106
14ef37b6
AH		 2107 rt = addrconf_get_prefix_route(&pinfo->prefix,
2108 pinfo->prefix_len,
2109 dev,
2110 RTF_ADDRCONF | RTF_PREFIX_RT,
2111 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2112
14ef37b6 2113 if (rt) {
6f704992
YH		 2114 /* Autoconf prefix route */
2115 if (valid_lft == 0) {
2116 ip6_del_rt(rt);
2117 rt = NULL;
4bed72e4 2118 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2119 /* not infinity */
1716a961 2120 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2121 } else {
1716a961 2122 rt6_clean_expires(rt);
1da177e4
LT		 2123 }
2124 } else if (valid_lft) {
6f704992 2125 clock_t expires = 0;
4bed72e4
YH		 2126 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2127 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2128 /* not infinity */
2129 flags |= RTF_EXPIRES;
2130 expires = jiffies_to_clock_t(rt_expires);
2131 }
1da177e4 2132 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2133 dev, expires, flags);
1da177e4 2134 }
94e187c0 2135 ip6_rt_put(rt);
1da177e4
LT		 2136 }
2137
2138 /* Try to figure out our local address for this prefix */
2139
2140 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2141 struct inet6_ifaddr *ifp;
1da177e4
LT		 2142 struct in6_addr addr;
2143 int create = 0, update_lft = 0;
617fe29d 2144 bool tokenized = false;
1da177e4
LT		 2145
2146 if (pinfo->prefix_len == 64) {
2147 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2148
2149 if (!ipv6_addr_any(&in6_dev->token)) {
2150 read_lock_bh(&in6_dev->lock);
2151 memcpy(addr.s6_addr + 8,
2152 in6_dev->token.s6_addr + 8, 8);
2153 read_unlock_bh(&in6_dev->lock);
617fe29d 2154 tokenized = true;
f53adae4
DB		 2155 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2156 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1da177e4
LT		 2157 in6_dev_put(in6_dev);
2158 return;
2159 }
2160 goto ok;
2161 }
e87cc472
JP		 2162 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2163 pinfo->prefix_len);
1da177e4
LT		 2164 in6_dev_put(in6_dev);
2165 return;
2166
2167ok:
2168
53b7997f 2169 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 2170
2171 if (ifp == NULL && valid_lft) {
2172 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2173 u32 addr_flags = 0;
2174
2175#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2176 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2177 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 2178 addr_flags = IFA_F_OPTIMISTIC;
2179#endif
1da177e4
LT		 2180
2181 /* Do not allow to create too much of autoconfigured
2182 * addresses; this would be too easy way to crash kernel.
2183 */
2184 if (!max_addresses ||
2185 ipv6_count_addresses(in6_dev) < max_addresses)
3f8f5298
JP		 2186 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2187 pinfo->prefix_len,
95c385b4 2188 addr_type&IPV6_ADDR_SCOPE_MASK,
8a226b2c
JB		 2189 addr_flags, valid_lft,
2190 prefered_lft);
1da177e4 2191
3f0d2ba0 2192 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2193 in6_dev_put(in6_dev);
2194 return;
2195 }
2196
8a226b2c
JB		 2197 update_lft = 0;
2198 create = 1;
1da177e4 2199 ifp->cstamp = jiffies;
617fe29d 2200 ifp->tokenized = tokenized;
cf22f9a2 2201 addrconf_dad_start(ifp);
1da177e4
LT		 2202 }
2203
2204 if (ifp) {
2205 int flags;
2206 unsigned long now;
2207#ifdef CONFIG_IPV6_PRIVACY
2208 struct inet6_ifaddr *ift;
2209#endif
2210 u32 stored_lft;
2211
2212 /* update lifetime (RFC2462 5.5.3 e) */
2213 spin_lock(&ifp->lock);
2214 now = jiffies;
2215 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2216 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2217 else
2218 stored_lft = 0;
8a226b2c 2219 if (!update_lft && !create && stored_lft) {
1da177e4
LT		 2220 if (valid_lft > MIN_VALID_LIFETIME ||
2221 valid_lft > stored_lft)
2222 update_lft = 1;
2223 else if (stored_lft <= MIN_VALID_LIFETIME) {
2224 /* valid_lft <= stored_lft is always true */
a1ed0526
BH		 2225 /*
2226 * RFC 4862 Section 5.5.3e:
2227 * "Note that the preferred lifetime of
2228 * the corresponding address is always
2229 * reset to the Preferred Lifetime in
2230 * the received Prefix Information
2231 * option, regardless of whether the
2232 * valid lifetime is also reset or
2233 * ignored."
2234 *
2235 * So if the preferred lifetime in
2236 * this advertisement is different
2237 * than what we have stored, but the
2238 * valid lifetime is invalid, just
2239 * reset prefered_lft.
2240 *
2241 * We must set the valid lifetime
2242 * to the stored lifetime since we'll
2243 * be updating the timestamp below,
2244 * else we'll set it back to the
25985edc 2245 * minimum.
a1ed0526
BH		 2246 */
2247 if (prefered_lft != ifp->prefered_lft) {
2248 valid_lft = stored_lft;
2249 update_lft = 1;
2250 }
1da177e4
LT		 2251 } else {
2252 valid_lft = MIN_VALID_LIFETIME;
2253 if (valid_lft < prefered_lft)
2254 prefered_lft = valid_lft;
2255 update_lft = 1;
2256 }
2257 }
2258
2259 if (update_lft) {
2260 ifp->valid_lft = valid_lft;
2261 ifp->prefered_lft = prefered_lft;
2262 ifp->tstamp = now;
2263 flags = ifp->flags;
2264 ifp->flags &= ~IFA_F_DEPRECATED;
2265 spin_unlock(&ifp->lock);
2266
2267 if (!(flags&IFA_F_TENTATIVE))
2268 ipv6_ifa_notify(0, ifp);
2269 } else
2270 spin_unlock(&ifp->lock);
2271
2272#ifdef CONFIG_IPV6_PRIVACY
2273 read_lock_bh(&in6_dev->lock);
2274 /* update all temporary addresses in the list */
76f793e3
LC		 2275 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2276 tmp_list) {
2277 int age, max_valid, max_prefered;
2278
c6fbfac2
BB		 2279 if (ifp != ift->ifpub)
2280 continue;
2281
76f793e3
LC		 2282 /*
2283 * RFC 4941 section 3.3:
2284 * If a received option will extend the lifetime
2285 * of a public address, the lifetimes of
2286 * temporary addresses should be extended,
2287 * subject to the overall constraint that no
2288 * temporary addresses should ever remain
2289 * "valid" or "preferred" for a time longer than
2290 * (TEMP_VALID_LIFETIME) or
2291 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2292 * respectively.
2293 */
2294 age = (now - ift->cstamp) / HZ;
2295 max_valid = in6_dev->cnf.temp_valid_lft - age;
2296 if (max_valid < 0)
2297 max_valid = 0;
2298
2299 max_prefered = in6_dev->cnf.temp_prefered_lft -
2300 in6_dev->cnf.max_desync_factor -
2301 age;
2302 if (max_prefered < 0)
2303 max_prefered = 0;
2304
2305 if (valid_lft > max_valid)
2306 valid_lft = max_valid;
2307
2308 if (prefered_lft > max_prefered)
2309 prefered_lft = max_prefered;
2310
1da177e4
LT		 2311 spin_lock(&ift->lock);
2312 flags = ift->flags;
76f793e3
LC		 2313 ift->valid_lft = valid_lft;
2314 ift->prefered_lft = prefered_lft;
2315 ift->tstamp = now;
2316 if (prefered_lft > 0)
2317 ift->flags &= ~IFA_F_DEPRECATED;
2318
1da177e4
LT		 2319 spin_unlock(&ift->lock);
2320 if (!(flags&IFA_F_TENTATIVE))
2321 ipv6_ifa_notify(0, ift);
2322 }
2323
aed65501 2324 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
1da177e4 2325 /*
76f793e3
LC		 2326 * When a new public address is created as
2327 * described in [ADDRCONF], also create a new
2328 * temporary address. Also create a temporary
2329 * address if it's enabled but no temporary
2330 * address currently exists.
1da177e4 2331 */
1ab1457c 2332 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 2333 ipv6_create_tempaddr(ifp, NULL);
2334 } else {
2335 read_unlock_bh(&in6_dev->lock);
2336 }
2337#endif
2338 in6_ifa_put(ifp);
2339 addrconf_verify(0);
2340 }
2341 }
2342 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2343 in6_dev_put(in6_dev);
2344}
2345
2346/*
2347 * Set destination address.
2348 * Special case for SIT interfaces where we create a new "virtual"
2349 * device.
2350 */
af284937 2351int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2352{
2353 struct in6_ifreq ireq;
2354 struct net_device *dev;
2355 int err = -EINVAL;
2356
2357 rtnl_lock();
2358
2359 err = -EFAULT;
2360 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2361 goto err_exit;
2362
af284937 2363 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2364
2365 err = -ENODEV;
2366 if (dev == NULL)
2367 goto err_exit;
2368
07a93626 2369#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2370 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2371 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2372 struct ifreq ifr;
1da177e4
LT		 2373 struct ip_tunnel_parm p;
2374
2375 err = -EADDRNOTAVAIL;
2376 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2377 goto err_exit;
2378
2379 memset(&p, 0, sizeof(p));
2380 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2381 p.iph.saddr = 0;
2382 p.iph.version = 4;
2383 p.iph.ihl = 5;
2384 p.iph.protocol = IPPROTO_IPV6;
2385 p.iph.ttl = 64;
d20b3109 2386 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2387
5bc3eb7e
SH		 2388 if (ops->ndo_do_ioctl) {
2389 mm_segment_t oldfs = get_fs();
2390
2391 set_fs(KERNEL_DS);
2392 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2393 set_fs(oldfs);
2394 } else
2395 err = -EOPNOTSUPP;
1da177e4
LT		 2396
2397 if (err == 0) {
2398 err = -ENOBUFS;
af284937
DL		 2399 dev = __dev_get_by_name(net, p.name);
2400 if (!dev)
1da177e4
LT		 2401 goto err_exit;
2402 err = dev_open(dev);
2403 }
2404 }
0be669bb 2405#endif
1da177e4
LT		 2406
2407err_exit:
2408 rtnl_unlock();
2409 return err;
2410}
2411
2412/*
2413 * Manual configuration of address on an interface
2414 */
b71d1d42 2415static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
caeaba79 2416 const struct in6_addr *peer_pfx,
24ef0da7 2417 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2418 __u32 valid_lft)
1da177e4
LT		 2419{
2420 struct inet6_ifaddr *ifp;
2421 struct inet6_dev *idev;
2422 struct net_device *dev;
2423 int scope;
6f704992
YH		 2424 u32 flags;
2425 clock_t expires;
4bed72e4 2426 unsigned long timeout;
1da177e4
LT		 2427
2428 ASSERT_RTNL();
1ab1457c 2429
24ef0da7
TG		 2430 if (plen > 128)
2431 return -EINVAL;
2432
0778769d
NT		 2433 /* check the lifetime */
2434 if (!valid_lft || prefered_lft > valid_lft)
2435 return -EINVAL;
2436
af284937
DL		 2437 dev = __dev_get_by_index(net, ifindex);
2438 if (!dev)
1da177e4 2439 return -ENODEV;
1ab1457c 2440
64e724f6
BH		 2441 idev = addrconf_add_dev(dev);
2442 if (IS_ERR(idev))
2443 return PTR_ERR(idev);
1da177e4
LT		 2444
2445 scope = ipv6_addr_scope(pfx);
2446
4bed72e4
YH		 2447 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2448 if (addrconf_finite_timeout(timeout)) {
2449 expires = jiffies_to_clock_t(timeout * HZ);
2450 valid_lft = timeout;
6f704992 2451 flags = RTF_EXPIRES;
4bed72e4
YH		 2452 } else {
2453 expires = 0;
2454 flags = 0;
2455 ifa_flags |= IFA_F_PERMANENT;
6f704992 2456 }
0778769d 2457
4bed72e4
YH		 2458 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2459 if (addrconf_finite_timeout(timeout)) {
2460 if (timeout == 0)
2461 ifa_flags |= IFA_F_DEPRECATED;
2462 prefered_lft = timeout;
2463 }
0778769d 2464
8a226b2c
JB		 2465 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2466 valid_lft, prefered_lft);
0778769d 2467
1da177e4 2468 if (!IS_ERR(ifp)) {
46d48046 2469 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2470 expires, flags);
95c385b4
NH		 2471 /*
2472 * Note that section 3.1 of RFC 4429 indicates
2473 * that the Optimistic flag should not be set for
2474 * manually configured addresses
2475 */
cf22f9a2 2476 addrconf_dad_start(ifp);
1da177e4 2477 in6_ifa_put(ifp);
0778769d 2478 addrconf_verify(0);
1da177e4
LT		 2479 return 0;
2480 }
2481
2482 return PTR_ERR(ifp);
2483}
2484
b71d1d42 2485static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2486 unsigned int plen)
1da177e4
LT		 2487{
2488 struct inet6_ifaddr *ifp;
2489 struct inet6_dev *idev;
2490 struct net_device *dev;
1ab1457c 2491
24ef0da7
TG		 2492 if (plen > 128)
2493 return -EINVAL;
2494
af284937
DL		 2495 dev = __dev_get_by_index(net, ifindex);
2496 if (!dev)
1da177e4
LT		 2497 return -ENODEV;
2498
2499 if ((idev = __in6_dev_get(dev)) == NULL)
2500 return -ENXIO;
2501
2502 read_lock_bh(&idev->lock);
502a2ffd 2503 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2504 if (ifp->prefix_len == plen &&
2505 ipv6_addr_equal(pfx, &ifp->addr)) {
2506 in6_ifa_hold(ifp);
2507 read_unlock_bh(&idev->lock);
1ab1457c 2508
1da177e4 2509 ipv6_del_addr(ifp);
1da177e4
LT		 2510 return 0;
2511 }
2512 }
2513 read_unlock_bh(&idev->lock);
2514 return -EADDRNOTAVAIL;
2515}
2516
2517
af284937 2518int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2519{
2520 struct in6_ifreq ireq;
2521 int err;
1ab1457c 2522
af31f412 2523 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2524 return -EPERM;
1ab1457c 2525
1da177e4
LT		 2526 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2527 return -EFAULT;
2528
2529 rtnl_lock();
caeaba79 2530 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2531 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2532 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2533 rtnl_unlock();
2534 return err;
2535}
2536
af284937 2537int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2538{
2539 struct in6_ifreq ireq;
2540 int err;
1ab1457c 2541
af31f412 2542 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2543 return -EPERM;
2544
2545 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2546 return -EFAULT;
2547
2548 rtnl_lock();
af284937
DL		 2549 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2550 ireq.ifr6_prefixlen);
1da177e4
LT		 2551 rtnl_unlock();
2552 return err;
2553}
2554
b5f348e5
IJ		 2555static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2556 int plen, int scope)
2557{
2558 struct inet6_ifaddr *ifp;
2559
8a226b2c
JB		 2560 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2561 scope, IFA_F_PERMANENT, 0, 0);
b5f348e5
IJ		 2562 if (!IS_ERR(ifp)) {
2563 spin_lock_bh(&ifp->lock);
2564 ifp->flags &= ~IFA_F_TENTATIVE;
2565 spin_unlock_bh(&ifp->lock);
2566 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2567 in6_ifa_put(ifp);
2568 }
2569}
2570
07a93626 2571#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2572static void sit_add_v4_addrs(struct inet6_dev *idev)
2573{
1da177e4
LT		 2574 struct in6_addr addr;
2575 struct net_device *dev;
c346dca1 2576 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2577 int scope;
2578
2579 ASSERT_RTNL();
2580
2581 memset(&addr, 0, sizeof(struct in6_addr));
2582 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2583
2584 if (idev->dev->flags&IFF_POINTOPOINT) {
2585 addr.s6_addr32[0] = htonl(0xfe800000);
2586 scope = IFA_LINK;
2587 } else {
2588 scope = IPV6_ADDR_COMPATv4;
2589 }
2590
2591 if (addr.s6_addr32[3]) {
b5f348e5 2592 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2593 return;
2594 }
2595
6fda7350 2596 for_each_netdev(net, dev) {
8e5e8f30 2597 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2598 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2599 struct in_ifaddr *ifa;
1da177e4
LT		 2600
2601 int flag = scope;
2602
2603 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2604 int plen;
2605
2606 addr.s6_addr32[3] = ifa->ifa_local;
2607
2608 if (ifa->ifa_scope == RT_SCOPE_LINK)
2609 continue;
2610 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2611 if (idev->dev->flags&IFF_POINTOPOINT)
2612 continue;
2613 flag |= IFA_HOST;
2614 }
2615 if (idev->dev->flags&IFF_POINTOPOINT)
2616 plen = 64;
2617 else
2618 plen = 96;
2619
b5f348e5 2620 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2621 }
2622 }
1ab1457c 2623 }
1da177e4 2624}
0be669bb 2625#endif
1da177e4
LT		 2626
2627static void init_loopback(struct net_device *dev)
2628{
2629 struct inet6_dev *idev;
25fb6ca4
BK		 2630 struct net_device *sp_dev;
2631 struct inet6_ifaddr *sp_ifa;
2632 struct rt6_info *sp_rt;
1da177e4
LT		 2633
2634 /* ::1 */
2635
2636 ASSERT_RTNL();
2637
2638 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2639 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2640 return;
2641 }
2642
b5f348e5 2643 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2644
2645 /* Add routes to other interface's IPv6 addresses */
2646 for_each_netdev(dev_net(dev), sp_dev) {
2647 if (!strcmp(sp_dev->name, dev->name))
2648 continue;
2649
2650 idev = __in6_dev_get(sp_dev);
2651 if (!idev)
2652 continue;
2653
2654 read_lock_bh(&idev->lock);
2655 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2656
2657 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2658 continue;
2659
a881ae1f
G		 2660 if (sp_ifa->rt)
2661 continue;
2662
25fb6ca4
BK		 2663 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
2664
2665 /* Failure cases are ignored */
534c8779
G		 2666 if (!IS_ERR(sp_rt)) {
2667 sp_ifa->rt = sp_rt;
25fb6ca4 2668 ip6_ins_rt(sp_rt);
534c8779 2669 }
25fb6ca4
BK		 2670 }
2671 read_unlock_bh(&idev->lock);
2672 }
1da177e4
LT		 2673}
2674
b71d1d42 2675static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4 2676{
8e5e8f30 2677 struct inet6_ifaddr *ifp;
95c385b4
NH		 2678 u32 addr_flags = IFA_F_PERMANENT;
2679
2680#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2681 if (idev->cnf.optimistic_dad &&
702beb87 2682 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2683 addr_flags |= IFA_F_OPTIMISTIC;
2684#endif
1da177e4 2685
95c385b4 2686
8a226b2c 2687 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 0, 0);
1da177e4 2688 if (!IS_ERR(ifp)) {
46d48046 2689 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2690 addrconf_dad_start(ifp);
1da177e4
LT		 2691 in6_ifa_put(ifp);
2692 }
2693}
2694
2695static void addrconf_dev_config(struct net_device *dev)
2696{
2697 struct in6_addr addr;
8e5e8f30 2698 struct inet6_dev *idev;
1da177e4
LT		 2699
2700 ASSERT_RTNL();
2701
74235a25
HX		 2702 if ((dev->type != ARPHRD_ETHER) &&
2703 (dev->type != ARPHRD_FDDI) &&
74235a25 2704 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 2705 (dev->type != ARPHRD_INFINIBAND) &&
cb6bf355
YH		 2706 (dev->type != ARPHRD_IEEE802154) &&
2707 (dev->type != ARPHRD_IEEE1394)) {
74235a25
HX		 2708 /* Alas, we support only Ethernet autoconfiguration. */
2709 return;
2710 }
2711
1da177e4 2712 idev = addrconf_add_dev(dev);
64e724f6 2713 if (IS_ERR(idev))
1da177e4
LT		 2714 return;
2715
2716 memset(&addr, 0, sizeof(struct in6_addr));
2717 addr.s6_addr32[0] = htonl(0xFE800000);
2718
2719 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2720 addrconf_add_linklocal(idev, &addr);
2721}
2722
07a93626 2723#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2724static void addrconf_sit_config(struct net_device *dev)
2725{
2726 struct inet6_dev *idev;
2727
2728 ASSERT_RTNL();
2729
1ab1457c
YH		 2730 /*
2731 * Configure the tunnel with one of our IPv4
2732 * addresses... we should configure all of
1da177e4
LT		 2733 * our v4 addrs in the tunnel
2734 */
2735
2736 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2737 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2738 return;
2739 }
2740
c7dc89c0
FT		 2741 if (dev->priv_flags & IFF_ISATAP) {
2742 struct in6_addr addr;
2743
2744 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2745 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2746 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2747 addrconf_add_linklocal(idev, &addr);
2748 return;
2749 }
2750
1da177e4
LT		 2751 sit_add_v4_addrs(idev);
2752
62b54dd9 2753 if (dev->flags&IFF_POINTOPOINT)
1da177e4 2754 addrconf_add_mroute(dev);
62b54dd9 2755 else
1da177e4
LT		 2756 sit_route_add(dev);
2757}
0be669bb 2758#endif
1da177e4 2759
07a93626 2760#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2761static void addrconf_gre_config(struct net_device *dev)
2762{
2763 struct inet6_dev *idev;
2764 struct in6_addr addr;
2765
aee80b54 2766 ASSERT_RTNL();
2767
2768 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2769 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 2770 return;
2771 }
2772
2773 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2774 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2775
2776 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2777 addrconf_add_linklocal(idev, &addr);
2778}
2779#endif
2780
1da177e4
LT		 2781static inline int
2782ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2783{
2784 struct in6_addr lladdr;
2785
95c385b4 2786 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2787 addrconf_add_linklocal(idev, &lladdr);
2788 return 0;
2789 }
2790 return -1;
2791}
2792
2793static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2794{
2795 struct net_device *link_dev;
c346dca1 2796 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2797
2798 /* first try to inherit the link-local address from the link device */
2799 if (idev->dev->iflink &&
6fda7350 2800 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2801 if (!ipv6_inherit_linklocal(idev, link_dev))
2802 return;
2803 }
2804 /* then try to inherit it from any device */
6fda7350 2805 for_each_netdev(net, link_dev) {
1da177e4
LT		 2806 if (!ipv6_inherit_linklocal(idev, link_dev))
2807 return;
2808 }
91df42be 2809 pr_debug("init ip6-ip6: add_linklocal failed\n");
1da177e4
LT		 2810}
2811
2812/*
2813 * Autoconfigure tunnel with a link-local address so routing protocols,
2814 * DHCPv6, MLD etc. can be run over the virtual link
2815 */
2816
2817static void addrconf_ip6_tnl_config(struct net_device *dev)
2818{
2819 struct inet6_dev *idev;
2820
2821 ASSERT_RTNL();
2822
e21e8467 2823 idev = addrconf_add_dev(dev);
64e724f6 2824 if (IS_ERR(idev)) {
91df42be 2825 pr_debug("init ip6-ip6: add_dev failed\n");
1da177e4
LT		 2826 return;
2827 }
2828 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2829}
2830
1ab1457c 2831static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 2832 void *ptr)
1da177e4 2833{
351638e7 2834 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 2835 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2836 int run_pending = 0;
b217d616 2837 int err;
1da177e4 2838
e21e8467 2839 switch (event) {
45ba9dd2 2840 case NETDEV_REGISTER:
74235a25 2841 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2842 idev = ipv6_add_dev(dev);
2843 if (!idev)
b217d616 2844 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2845 }
2846 break;
bcdd553f 2847
1da177e4 2848 case NETDEV_UP:
3c21edbd 2849 case NETDEV_CHANGE:
c2edacf8
JV		 2850 if (dev->flags & IFF_SLAVE)
2851 break;
2852
3c21edbd 2853 if (event == NETDEV_UP) {
f24e3d65 2854 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 2855 /* device is not ready yet. */
f3213831 2856 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 2857 dev->name);
2858 break;
2859 }
99081049 2860
d31c7b8f
EP		 2861 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2862 idev = ipv6_add_dev(dev);
2863
e3ec6cfc 2864 if (idev) {
99081049 2865 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2866 run_pending = 1;
2867 }
3c21edbd 2868 } else {
f24e3d65 2869 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2870 /* device is still not ready. */
2871 break;
2872 }
2873
2874 if (idev) {
bcdd553f 2875 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2876 /* device is already configured. */
2877 break;
3c21edbd
YH		 2878 idev->if_flags |= IF_READY;
2879 }
2880
f3213831
JP		 2881 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2882 dev->name);
3c21edbd 2883
c5e33bdd 2884 run_pending = 1;
3c21edbd
YH		 2885 }
2886
e21e8467 2887 switch (dev->type) {
07a93626 2888#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2889 case ARPHRD_SIT:
2890 addrconf_sit_config(dev);
2891 break;
aee80b54 2892#endif
07a93626 2893#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2894 case ARPHRD_IPGRE:
2895 addrconf_gre_config(dev);
2896 break;
0be669bb 2897#endif
1da177e4
LT		 2898 case ARPHRD_TUNNEL6:
2899 addrconf_ip6_tnl_config(dev);
2900 break;
2901 case ARPHRD_LOOPBACK:
2902 init_loopback(dev);
2903 break;
2904
2905 default:
2906 addrconf_dev_config(dev);
2907 break;
3ff50b79 2908 }
bcdd553f 2909
1da177e4 2910 if (idev) {
c5e33bdd
YH		 2911 if (run_pending)
2912 addrconf_dad_run(idev);
2913
bcdd553f
SH		 2914 /*
2915 * If the MTU changed during the interface down,
2916 * when the interface up, the changed MTU must be
2917 * reflected in the idev as well as routers.
1da177e4 2918 */
bcdd553f
SH		 2919 if (idev->cnf.mtu6 != dev->mtu &&
2920 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2921 rt6_mtu_change(dev, dev->mtu);
2922 idev->cnf.mtu6 = dev->mtu;
2923 }
2924 idev->tstamp = jiffies;
2925 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2926
2927 /*
2928 * If the changed mtu during down is lower than
2929 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2930 */
2931 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2932 addrconf_ifdown(dev, 1);
1da177e4
LT		 2933 }
2934 break;
2935
2936 case NETDEV_CHANGEMTU:
d31c7b8f 2937 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2938 rt6_mtu_change(dev, dev->mtu);
2939 idev->cnf.mtu6 = dev->mtu;
2940 break;
2941 }
2942
d31c7b8f
EP		 2943 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2944 idev = ipv6_add_dev(dev);
2945 if (idev)
2946 break;
2947 }
2948
bcdd553f
SH		 2949 /*
2950 * MTU falled under IPV6_MIN_MTU.
2951 * Stop IPv6 on this interface.
2952 */
1da177e4
LT		 2953
2954 case NETDEV_DOWN:
2955 case NETDEV_UNREGISTER:
2956 /*
2957 * Remove all addresses from this interface.
2958 */
2959 addrconf_ifdown(dev, event != NETDEV_DOWN);
2960 break;
3c21edbd 2961
1da177e4 2962 case NETDEV_CHANGENAME:
1da177e4 2963 if (idev) {
5632c515 2964 snmp6_unregister_dev(idev);
408c4768 2965 addrconf_sysctl_unregister(idev);
f52295a9 2966 addrconf_sysctl_register(idev);
b217d616
HX		 2967 err = snmp6_register_dev(idev);
2968 if (err)
2969 return notifier_from_errno(err);
5632c515 2970 }
1da177e4 2971 break;
bcdd553f 2972
93d9b7d7
JP		 2973 case NETDEV_PRE_TYPE_CHANGE:
2974 case NETDEV_POST_TYPE_CHANGE:
2975 addrconf_type_change(dev, event);
75c78500 2976 break;
3ff50b79 2977 }
1da177e4
LT		 2978
2979 return NOTIFY_OK;
2980}
2981
2982/*
2983 * addrconf module should be notified of a device going up
2984 */
2985static struct notifier_block ipv6_dev_notf = {
2986 .notifier_call = addrconf_notify,
1da177e4
LT		 2987};
2988
93d9b7d7 2989static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2990{
2991 struct inet6_dev *idev;
2992 ASSERT_RTNL();
2993
2994 idev = __in6_dev_get(dev);
2995
93d9b7d7 2996 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2997 ipv6_mc_remap(idev);
93d9b7d7 2998 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2999 ipv6_mc_unmap(idev);
3000}
3001
1da177e4
LT		 3002static int addrconf_ifdown(struct net_device *dev, int how)
3003{
c346dca1 3004 struct net *net = dev_net(dev);
502a2ffd 3005 struct inet6_dev *idev;
3006 struct inet6_ifaddr *ifa;
73a8bd74 3007 int state, i;
1da177e4
LT		 3008
3009 ASSERT_RTNL();
3010
73a8bd74
DM		 3011 rt6_ifdown(net, dev);
3012 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3013
3014 idev = __in6_dev_get(dev);
3015 if (idev == NULL)
3016 return -ENODEV;
3017
bcdd553f
SH		 3018 /*
3019 * Step 1: remove reference to ipv6 device from parent device.
3020 * Do not dev_put!
1da177e4 3021 */
439e2385 3022 if (how) {
1da177e4 3023 idev->dead = 1;
8814c4b5
YH		 3024
3025 /* protected by rtnl_lock */
a9b3cd7f 3026 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3027
3028 /* Step 1.5: remove snmp6 entry */
3029 snmp6_unregister_dev(idev);
3030
3031 }
3032
73a8bd74
DM		 3033 /* Step 2: clear hash table */
3034 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3035 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3036
3037 spin_lock_bh(&addrconf_hash_lock);
3038 restart:
b67bfe0d 3039 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74
DM		 3040 if (ifa->idev == idev) {
3041 hlist_del_init_rcu(&ifa->addr_lst);
b7b1bfce 3042 addrconf_del_dad_timer(ifa);
73a8bd74
DM		 3043 goto restart;
3044 }
3045 }
3046 spin_unlock_bh(&addrconf_hash_lock);
3047 }
3048
1da177e4
LT		 3049 write_lock_bh(&idev->lock);
3050
b7b1bfce
HFS		 3051 addrconf_del_rs_timer(idev);
3052
bcdd553f 3053 /* Step 2: clear flags for stateless addrconf */
439e2385 3054 if (!how)
3c21edbd 3055 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3056
1da177e4 3057#ifdef CONFIG_IPV6_PRIVACY
439e2385 3058 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 3059 in6_dev_put(idev);
3060
bcdd553f 3061 /* Step 3: clear tempaddr list */
372e6c8f 3062 while (!list_empty(&idev->tempaddr_list)) {
3063 ifa = list_first_entry(&idev->tempaddr_list,
3064 struct inet6_ifaddr, tmp_list);
3065 list_del(&ifa->tmp_list);
1da177e4
LT		 3066 write_unlock_bh(&idev->lock);
3067 spin_lock_bh(&ifa->lock);
3068
3069 if (ifa->ifpub) {
3070 in6_ifa_put(ifa->ifpub);
3071 ifa->ifpub = NULL;
3072 }
3073 spin_unlock_bh(&ifa->lock);
3074 in6_ifa_put(ifa);
3075 write_lock_bh(&idev->lock);
3076 }
3077#endif
8f37ada5 3078
502a2ffd 3079 while (!list_empty(&idev->addr_list)) {
3080 ifa = list_first_entry(&idev->addr_list,
3081 struct inet6_ifaddr, if_list);
b7b1bfce 3082 addrconf_del_dad_timer(ifa);
84e8b803 3083
73a8bd74 3084 list_del(&ifa->if_list);
84e8b803 3085
73a8bd74 3086 write_unlock_bh(&idev->lock);
84e8b803 3087
73a8bd74
DM		 3088 spin_lock_bh(&ifa->state_lock);
3089 state = ifa->state;
3090 ifa->state = INET6_IFADDR_STATE_DEAD;
3091 spin_unlock_bh(&ifa->state_lock);
9d82ca98 3092
73a8bd74
DM		 3093 if (state != INET6_IFADDR_STATE_DEAD) {
3094 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3095 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 3096 }
73a8bd74 3097 in6_ifa_put(ifa);
8f37ada5 3098
73a8bd74
DM		 3099 write_lock_bh(&idev->lock);
3100 }
8f37ada5 3101
1da177e4
LT		 3102 write_unlock_bh(&idev->lock);
3103
3104 /* Step 5: Discard multicast list */
439e2385 3105 if (how)
1da177e4
LT		 3106 ipv6_mc_destroy_dev(idev);
3107 else
3108 ipv6_mc_down(idev);
3109
1da177e4 3110 idev->tstamp = jiffies;
1ab1457c 3111
bcdd553f 3112 /* Last: Shot the device (if unregistered) */
439e2385 3113 if (how) {
408c4768 3114 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3115 neigh_parms_release(&nd_tbl, idev->nd_parms);
3116 neigh_ifdown(&nd_tbl, dev);
3117 in6_dev_put(idev);
3118 }
3119 return 0;
3120}
3121
3122static void addrconf_rs_timer(unsigned long data)
3123{
b7b1bfce
HFS		 3124 struct inet6_dev *idev = (struct inet6_dev *)data;
3125 struct in6_addr lladdr;
1da177e4 3126
b7b1bfce 3127 write_lock(&idev->lock);
5b2a1953 3128 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3129 goto out;
3130
9ba2add3 3131 if (!ipv6_accept_ra(idev))
5b2a1953 3132 goto out;
3133
3134 /* Announcement received after solicitation was sent */
3135 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3136 goto out;
1da177e4 3137
b7b1bfce
HFS		 3138 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3139 if (!__ipv6_get_lladdr(idev, &lladdr, IFA_F_TENTATIVE))
3140 ndisc_send_rs(idev->dev, &lladdr,
3141 &in6addr_linklocal_allrouters);
3142 else
3143 goto out;
1da177e4 3144
b7b1bfce
HFS		 3145 /* The wait after the last probe can be shorter */
3146 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3147 idev->cnf.rtr_solicits) ?
3148 idev->cnf.rtr_solicit_delay :
3149 idev->cnf.rtr_solicit_interval);
1da177e4 3150 } else {
1da177e4
LT		 3151 /*
3152 * Note: we do not support deprecated "all on-link"
3153 * assumption any longer.
3154 */
91df42be 3155 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3156 }
3157
3158out:
b7b1bfce
HFS		 3159 write_unlock(&idev->lock);
3160 in6_dev_put(idev);
1da177e4
LT		 3161}
3162
3163/*
3164 * Duplicate Address Detection
3165 */
3c21edbd
YH		 3166static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3167{
3168 unsigned long rand_num;
3169 struct inet6_dev *idev = ifp->idev;
3170
95c385b4
NH		 3171 if (ifp->flags & IFA_F_OPTIMISTIC)
3172 rand_num = 0;
3173 else
3174 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3175
b7b1bfce
HFS		 3176 ifp->dad_probes = idev->cnf.dad_transmits;
3177 addrconf_mod_dad_timer(ifp, rand_num);
3c21edbd
YH		 3178}
3179
cf22f9a2 3180static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4
LT		 3181{
3182 struct inet6_dev *idev = ifp->idev;
3183 struct net_device *dev = idev->dev;
1da177e4
LT		 3184
3185 addrconf_join_solict(dev, &ifp->addr);
3186
1da177e4 3187 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 3188
3189 read_lock_bh(&idev->lock);
622ccdf1 3190 spin_lock(&ifp->lock);
e9d3e084 3191 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3192 goto out;
1da177e4
LT		 3193
3194 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3195 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3196 !(ifp->flags&IFA_F_TENTATIVE) ||
3197 ifp->flags & IFA_F_NODAD) {
cc411d0b 3198 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3199 spin_unlock(&ifp->lock);
1da177e4
LT		 3200 read_unlock_bh(&idev->lock);
3201
3202 addrconf_dad_completed(ifp);
3203 return;
3204 }
3205
6732bade 3206 if (!(idev->if_flags & IF_READY)) {
21809faf 3207 spin_unlock(&ifp->lock);
6732bade 3208 read_unlock_bh(&idev->lock);
3c21edbd 3209 /*
590a9887 3210 * If the device is not ready:
3c21edbd
YH		 3211 * - keep it tentative if it is a permanent address.
3212 * - otherwise, kill it.
3213 */
3214 in6_ifa_hold(ifp);
cc411d0b 3215 addrconf_dad_stop(ifp, 0);
6732bade 3216 return;
3c21edbd 3217 }
95c385b4
NH		 3218
3219 /*
3220 * Optimistic nodes can start receiving
3221 * Frames right away
3222 */
e21e8467 3223 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 3224 ip6_ins_rt(ifp->rt);
3225
6732bade 3226 addrconf_dad_kick(ifp);
1da177e4 3227out:
622ccdf1 3228 spin_unlock(&ifp->lock);
1da177e4
LT		 3229 read_unlock_bh(&idev->lock);
3230}
3231
3232static void addrconf_dad_timer(unsigned long data)
3233{
3234 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3235 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3236 struct in6_addr mcaddr;
3237
b7b1bfce 3238 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3239 goto out;
3240
b7b1bfce 3241 write_lock(&idev->lock);
122e4519 3242 if (idev->dead || !(idev->if_flags & IF_READY)) {
b7b1bfce 3243 write_unlock(&idev->lock);
1da177e4
LT		 3244 goto out;
3245 }
21809faf 3246
3247 spin_lock(&ifp->lock);
622ccdf1
HX		 3248 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3249 spin_unlock(&ifp->lock);
b7b1bfce 3250 write_unlock(&idev->lock);
622ccdf1
HX		 3251 goto out;
3252 }
3253
b7b1bfce 3254 if (ifp->dad_probes == 0) {
1da177e4
LT		 3255 /*
3256 * DAD was successful
3257 */
3258
cc411d0b 3259 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3260 spin_unlock(&ifp->lock);
b7b1bfce 3261 write_unlock(&idev->lock);
1da177e4
LT		 3262
3263 addrconf_dad_completed(ifp);
3264
3265 goto out;
3266 }
3267
b7b1bfce
HFS		 3268 ifp->dad_probes--;
3269 addrconf_mod_dad_timer(ifp, ifp->idev->nd_parms->retrans_time);
21809faf 3270 spin_unlock(&ifp->lock);
b7b1bfce 3271 write_unlock(&idev->lock);
1da177e4
LT		 3272
3273 /* send a neighbour solicitation for our addr */
1da177e4 3274 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3275 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3276out:
3277 in6_ifa_put(ifp);
3278}
3279
3280static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3281{
e21e8467 3282 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3283 struct in6_addr lladdr;
b173ee48 3284 bool send_rs, send_mld;
b7b1bfce
HFS		 3285
3286 addrconf_del_dad_timer(ifp);
1da177e4
LT		 3287
3288 /*
3289 * Configure the address for reception. Now it is valid.
3290 */
3291
3292 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3293
026359bc
TA		 3294 /* If added prefix is link local and we are prepared to process
3295 router advertisements, start sending router solicitations.
1da177e4
LT		 3296 */
3297
1ec047eb
HFS		 3298 read_lock_bh(&ifp->idev->lock);
3299 spin_lock(&ifp->lock);
b173ee48
HFS		 3300 send_mld = ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL &&
3301 ifp->idev->valid_ll_addr_cnt == 1;
3302 send_rs = send_mld &&
3303 ipv6_accept_ra(ifp->idev) &&
1ec047eb 3304 ifp->idev->cnf.rtr_solicits > 0 &&
b173ee48 3305 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 3306 spin_unlock(&ifp->lock);
3307 read_unlock_bh(&ifp->idev->lock);
3308
b173ee48
HFS		 3309 /* While dad is in progress mld report's source address is in6_addrany.
3310 * Resend with proper ll now.
3311 */
3312 if (send_mld)
3313 ipv6_mc_dad_complete(ifp->idev);
3314
1ec047eb 3315 if (send_rs) {
1da177e4
LT		 3316 /*
3317 * If a host as already performed a random delay
3318 * [...] as part of DAD [...] there is no need
3319 * to delay again before sending the first RS
3320 */
1ec047eb 3321 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 3322 return;
1ec047eb 3323 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 3324
b7b1bfce
HFS		 3325 write_lock_bh(&ifp->idev->lock);
3326 spin_lock(&ifp->lock);
3327 ifp->idev->rs_probes = 1;
1da177e4 3328 ifp->idev->if_flags |= IF_RS_SENT;
b7b1bfce
HFS		 3329 addrconf_mod_rs_timer(ifp->idev,
3330 ifp->idev->cnf.rtr_solicit_interval);
3331 spin_unlock(&ifp->lock);
3332 write_unlock_bh(&ifp->idev->lock);
1da177e4
LT		 3333 }
3334}
3335
e21e8467
SH		 3336static void addrconf_dad_run(struct inet6_dev *idev)
3337{
c5e33bdd
YH		 3338 struct inet6_ifaddr *ifp;
3339
3340 read_lock_bh(&idev->lock);
502a2ffd 3341 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3342 spin_lock(&ifp->lock);
f2344a13
HX		 3343 if (ifp->flags & IFA_F_TENTATIVE &&
3344 ifp->state == INET6_IFADDR_STATE_DAD)
3345 addrconf_dad_kick(ifp);
21809faf 3346 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3347 }
3348 read_unlock_bh(&idev->lock);
3349}
3350
1da177e4
LT		 3351#ifdef CONFIG_PROC_FS
3352struct if6_iter_state {
3c40090a 3353 struct seq_net_private p;
1da177e4 3354 int bucket;
1d578303 3355 int offset;
1da177e4
LT		 3356};
3357
1d578303 3358static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3359{
3360 struct inet6_ifaddr *ifa = NULL;
3361 struct if6_iter_state *state = seq->private;
1218854a 3362 struct net *net = seq_file_net(seq);
1d578303 3363 int p = 0;
1da177e4 3364
1d578303
MM		 3365 /* initial bucket if pos is 0 */
3366 if (pos == 0) {
3367 state->bucket = 0;
3368 state->offset = 0;
3369 }
3370
3371 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3372 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3373 addr_lst) {
9f0d3c27
ED		 3374 if (!net_eq(dev_net(ifa->idev->dev), net))
3375 continue;
1d578303
MM		 3376 /* sync with offset */
3377 if (p < state->offset) {
3378 p++;
3379 continue;
3380 }
3381 state->offset++;
9f0d3c27 3382 return ifa;
1d578303
MM		 3383 }
3384
3385 /* prepare for next bucket */
3386 state->offset = 0;
3387 p = 0;
1da177e4 3388 }
c2e21293 3389 return NULL;
1da177e4
LT		 3390}
3391
c2e21293 3392static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3393 struct inet6_ifaddr *ifa)
1da177e4
LT		 3394{
3395 struct if6_iter_state *state = seq->private;
1218854a 3396 struct net *net = seq_file_net(seq);
1da177e4 3397
b67bfe0d 3398 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3399 if (!net_eq(dev_net(ifa->idev->dev), net))
3400 continue;
1d578303 3401 state->offset++;
9f0d3c27 3402 return ifa;
1d578303 3403 }
3c40090a 3404
c2e21293 3405 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3406 state->offset = 0;
b67bfe0d 3407 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3408 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3409 if (!net_eq(dev_net(ifa->idev->dev), net))
3410 continue;
1d578303 3411 state->offset++;
9f0d3c27 3412 return ifa;
c2e21293 3413 }
1da177e4 3414 }
3c40090a 3415
c2e21293 3416 return NULL;
1da177e4
LT		 3417}
3418
1da177e4 3419static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3420 __acquires(rcu_bh)
1da177e4 3421{
5c578aed 3422 rcu_read_lock_bh();
1d578303 3423 return if6_get_first(seq, *pos);
1da177e4
LT		 3424}
3425
3426static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3427{
3428 struct inet6_ifaddr *ifa;
3429
3430 ifa = if6_get_next(seq, v);
3431 ++*pos;
3432 return ifa;
3433}
3434
3435static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3436 __releases(rcu_bh)
1da177e4 3437{
5c578aed 3438 rcu_read_unlock_bh();
1da177e4
LT		 3439}
3440
3441static int if6_seq_show(struct seq_file *seq, void *v)
3442{
3443 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3444 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3445 &ifp->addr,
1da177e4
LT		 3446 ifp->idev->dev->ifindex,
3447 ifp->prefix_len,
3448 ifp->scope,
3449 ifp->flags,
3450 ifp->idev->dev->name);
3451 return 0;
3452}
3453
56b3d975 3454static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3455 .start = if6_seq_start,
3456 .next = if6_seq_next,
3457 .show = if6_seq_show,
3458 .stop = if6_seq_stop,
3459};
3460
3461static int if6_seq_open(struct inode *inode, struct file *file)
3462{
3c40090a
DL		 3463 return seq_open_net(inode, file, &if6_seq_ops,
3464 sizeof(struct if6_iter_state));
1da177e4
LT		 3465}
3466
9a32144e 3467static const struct file_operations if6_fops = {
1da177e4
LT		 3468 .owner = THIS_MODULE,
3469 .open = if6_seq_open,
3470 .read = seq_read,
3471 .llseek = seq_lseek,
3c40090a 3472 .release = seq_release_net,
1da177e4
LT		 3473};
3474
2c8c1e72 3475static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3476{
d4beaa66 3477 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 3478 return -ENOMEM;
3479 return 0;
3480}
3481
2c8c1e72 3482static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 3483{
ece31ffd 3484 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 3485}
3486
3487static struct pernet_operations if6_proc_net_ops = {
3488 .init = if6_proc_net_init,
3489 .exit = if6_proc_net_exit,
3490};
3491
3492int __init if6_proc_init(void)
3493{
3494 return register_pernet_subsys(&if6_proc_net_ops);
3495}
3496
1da177e4
LT		 3497void if6_proc_exit(void)
3498{
3c40090a 3499 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3500}
3501#endif /* CONFIG_PROC_FS */
3502
07a93626 3503#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3504/* Check if address is a home address configured on any interface. */
b71d1d42 3505int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3506{
3507 int ret = 0;
c2e21293 3508 struct inet6_ifaddr *ifp = NULL;
ddbe5032 3509 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3510
5c578aed 3511 rcu_read_lock_bh();
b67bfe0d 3512 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 3513 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3514 continue;
caad295f 3515 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3516 (ifp->flags & IFA_F_HOMEADDRESS)) {
3517 ret = 1;
3518 break;
3519 }
3520 }
5c578aed 3521 rcu_read_unlock_bh();
3b9f9a1c
NT		 3522 return ret;
3523}
3524#endif
3525
1da177e4
LT		 3526/*
3527 * Periodic address status verification
3528 */
3529
3530static void addrconf_verify(unsigned long foo)
3531{
b2db7564 3532 unsigned long now, next, next_sec, next_sched;
1da177e4 3533 struct inet6_ifaddr *ifp;
1da177e4
LT		 3534 int i;
3535
5c578aed 3536 rcu_read_lock_bh();
3537 spin_lock(&addrconf_verify_lock);
1da177e4 3538 now = jiffies;
b2db7564 3539 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4
LT		 3540
3541 del_timer(&addr_chk_timer);
3542
bcdd553f 3543 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3544restart:
b67bfe0d 3545 hlist_for_each_entry_rcu_bh(ifp,
5c578aed 3546 &inet6_addr_lst[i], addr_lst) {
1da177e4 3547 unsigned long age;
1da177e4
LT		 3548
3549 if (ifp->flags & IFA_F_PERMANENT)
3550 continue;
3551
3552 spin_lock(&ifp->lock);
b2db7564
YH		 3553 /* We try to batch several events at once. */
3554 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3555
8f27ebb9
YH		 3556 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3557 age >= ifp->valid_lft) {
1da177e4
LT		 3558 spin_unlock(&ifp->lock);
3559 in6_ifa_hold(ifp);
1da177e4
LT		 3560 ipv6_del_addr(ifp);
3561 goto restart;
8f27ebb9
YH		 3562 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3563 spin_unlock(&ifp->lock);
3564 continue;
1da177e4 3565 } else if (age >= ifp->prefered_lft) {
a1ed0526 3566 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3567 int deprecate = 0;
3568
3569 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3570 deprecate = 1;
3571 ifp->flags |= IFA_F_DEPRECATED;
3572 }
3573
3574 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3575 next = ifp->tstamp + ifp->valid_lft * HZ;
3576
3577 spin_unlock(&ifp->lock);
3578
3579 if (deprecate) {
3580 in6_ifa_hold(ifp);
1da177e4
LT		 3581
3582 ipv6_ifa_notify(0, ifp);
3583 in6_ifa_put(ifp);
3584 goto restart;
3585 }
3586#ifdef CONFIG_IPV6_PRIVACY
3587 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3588 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3589 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3590 ifp->idev->cnf.dad_transmits *
3591 ifp->idev->nd_parms->retrans_time / HZ;
3592
1da177e4
LT		 3593 if (age >= ifp->prefered_lft - regen_advance) {
3594 struct inet6_ifaddr *ifpub = ifp->ifpub;
3595 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3596 next = ifp->tstamp + ifp->prefered_lft * HZ;
3597 if (!ifp->regen_count && ifpub) {
3598 ifp->regen_count++;
3599 in6_ifa_hold(ifp);
3600 in6_ifa_hold(ifpub);
3601 spin_unlock(&ifp->lock);
5c578aed 3602
291d809b
HY		 3603 spin_lock(&ifpub->lock);
3604 ifpub->regen_count = 0;
3605 spin_unlock(&ifpub->lock);
1da177e4
LT		 3606 ipv6_create_tempaddr(ifpub, ifp);
3607 in6_ifa_put(ifpub);
3608 in6_ifa_put(ifp);
3609 goto restart;
3610 }
3611 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3612 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3613 spin_unlock(&ifp->lock);
3614#endif
3615 } else {
3616 /* ifp->prefered_lft <= ifp->valid_lft */
3617 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3618 next = ifp->tstamp + ifp->prefered_lft * HZ;
3619 spin_unlock(&ifp->lock);
3620 }
3621 }
1da177e4
LT		 3622 }
3623
b2db7564
YH		 3624 next_sec = round_jiffies_up(next);
3625 next_sched = next;
3626
3627 /* If rounded timeout is accurate enough, accept it. */
3628 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3629 next_sched = next_sec;
3630
3631 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3632 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3633 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3634
3635 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3636 now, next, next_sec, next_sched));
3637
3638 addr_chk_timer.expires = next_sched;
1da177e4 3639 add_timer(&addr_chk_timer);
5c578aed 3640 spin_unlock(&addrconf_verify_lock);
3641 rcu_read_unlock_bh();
1da177e4
LT		 3642}
3643
caeaba79
ND		 3644static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3645 struct in6_addr **peer_pfx)
461d8837
TG		 3646{
3647 struct in6_addr *pfx = NULL;
3648
caeaba79
ND		 3649 *peer_pfx = NULL;
3650
461d8837
TG		 3651 if (addr)
3652 pfx = nla_data(addr);
3653
3654 if (local) {
3655 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 3656 *peer_pfx = pfx;
3657 pfx = nla_data(local);
461d8837
TG		 3658 }
3659
3660 return pfx;
3661}
3662
ef7c79ed 3663static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3664 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3665 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3666 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3667};
3668
1da177e4 3669static int
661d2967 3670inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3671{
3b1e0a65 3672 struct net *net = sock_net(skb->sk);
b933f716
TG		 3673 struct ifaddrmsg *ifm;
3674 struct nlattr *tb[IFA_MAX+1];
caeaba79 3675 struct in6_addr *pfx, *peer_pfx;
b933f716 3676 int err;
1da177e4 3677
b933f716
TG		 3678 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3679 if (err < 0)
3680 return err;
3681
3682 ifm = nlmsg_data(nlh);
caeaba79 3683 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3684 if (pfx == NULL)
3685 return -EINVAL;
3686
af284937 3687 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3688}
3689
55ebaef1
NT		 3690static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3691 u32 prefered_lft, u32 valid_lft)
081bba5b 3692{
6f704992
YH		 3693 u32 flags;
3694 clock_t expires;
4bed72e4 3695 unsigned long timeout;
46d48046 3696
081bba5b
NT		 3697 if (!valid_lft || (prefered_lft > valid_lft))
3698 return -EINVAL;
3699
4bed72e4
YH		 3700 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3701 if (addrconf_finite_timeout(timeout)) {
3702 expires = jiffies_to_clock_t(timeout * HZ);
3703 valid_lft = timeout;
6f704992 3704 flags = RTF_EXPIRES;
4bed72e4
YH		 3705 } else {
3706 expires = 0;
3707 flags = 0;
3708 ifa_flags |= IFA_F_PERMANENT;
6f704992 3709 }
081bba5b 3710
4bed72e4
YH		 3711 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3712 if (addrconf_finite_timeout(timeout)) {
3713 if (timeout == 0)
3714 ifa_flags |= IFA_F_DEPRECATED;
3715 prefered_lft = timeout;
3716 }
081bba5b
NT		 3717
3718 spin_lock_bh(&ifp->lock);
3b9f9a1c 3719 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3720 ifp->tstamp = jiffies;
3721 ifp->valid_lft = valid_lft;
3722 ifp->prefered_lft = prefered_lft;
3723
3724 spin_unlock_bh(&ifp->lock);
3725 if (!(ifp->flags&IFA_F_TENTATIVE))
3726 ipv6_ifa_notify(0, ifp);
081bba5b 3727
46d48046 3728 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3729 expires, flags);
081bba5b
NT		 3730 addrconf_verify(0);
3731
3732 return 0;
3733}
3734
1da177e4 3735static int
661d2967 3736inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3737{
3b1e0a65 3738 struct net *net = sock_net(skb->sk);
461d8837
TG		 3739 struct ifaddrmsg *ifm;
3740 struct nlattr *tb[IFA_MAX+1];
caeaba79 3741 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 3742 struct inet6_ifaddr *ifa;
3743 struct net_device *dev;
55ebaef1
NT		 3744 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3745 u8 ifa_flags;
461d8837 3746 int err;
1da177e4 3747
461d8837
TG		 3748 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3749 if (err < 0)
3750 return err;
3751
3752 ifm = nlmsg_data(nlh);
caeaba79 3753 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3754 if (pfx == NULL)
3755 return -EINVAL;
3756
461d8837 3757 if (tb[IFA_CACHEINFO]) {
0778769d 3758 struct ifa_cacheinfo *ci;
461d8837
TG		 3759
3760 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3761 valid_lft = ci->ifa_valid;
461d8837
TG		 3762 preferred_lft = ci->ifa_prefered;
3763 } else {
3764 preferred_lft = INFINITY_LIFE_TIME;
3765 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3766 }
3767
af284937 3768 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3769 if (dev == NULL)
3770 return -ENODEV;
3771
55ebaef1 3772 /* We ignore other flags so far. */
3b9f9a1c 3773 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3774
1cab3da6 3775 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3776 if (ifa == NULL) {
3777 /*
3778 * It would be best to check for !NLM_F_CREATE here but
3779 * userspace alreay relies on not having to provide this.
3780 */
caeaba79 3781 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 3782 ifm->ifa_prefixlen, ifa_flags,
3783 preferred_lft, valid_lft);
081bba5b
NT		 3784 }
3785
7198f8ce
TG		 3786 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3787 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3788 err = -EEXIST;
3789 else
55ebaef1 3790 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3791
3792 in6_ifa_put(ifa);
3793
3794 return err;
1da177e4
LT		 3795}
3796
101bb229
TG		 3797static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3798 u8 scope, int ifindex)
3799{
3800 struct ifaddrmsg *ifm;
3801
3802 ifm = nlmsg_data(nlh);
3803 ifm->ifa_family = AF_INET6;
3804 ifm->ifa_prefixlen = prefixlen;
3805 ifm->ifa_flags = flags;
3806 ifm->ifa_scope = scope;
3807 ifm->ifa_index = ifindex;
3808}
3809
85486af0
TG		 3810static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3811 unsigned long tstamp, u32 preferred, u32 valid)
3812{
3813 struct ifa_cacheinfo ci;
3814
18a31e1e
TG		 3815 ci.cstamp = cstamp_delta(cstamp);
3816 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 3817 ci.ifa_prefered = preferred;
3818 ci.ifa_valid = valid;
3819
3820 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3821}
3822
101bb229
TG		 3823static inline int rt_scope(int ifa_scope)
3824{
3825 if (ifa_scope & IFA_HOST)
3826 return RT_SCOPE_HOST;
3827 else if (ifa_scope & IFA_LINK)
3828 return RT_SCOPE_LINK;
3829 else if (ifa_scope & IFA_SITE)
3830 return RT_SCOPE_SITE;
3831 else
3832 return RT_SCOPE_UNIVERSE;
3833}
3834
0ab6803b
TG		 3835static inline int inet6_ifaddr_msgsize(void)
3836{
339bf98f 3837 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 3838 + nla_total_size(16) /* IFA_LOCAL */
339bf98f
TG		 3839 + nla_total_size(16) /* IFA_ADDRESS */
3840 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3841}
c5396a31 3842
1da177e4 3843static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 3844 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3845{
1da177e4 3846 struct nlmsghdr *nlh;
85486af0 3847 u32 preferred, valid;
1da177e4 3848
15e47304 3849 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3850 if (nlh == NULL)
26932566 3851 return -EMSGSIZE;
0ab6803b 3852
101bb229
TG		 3853 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3854 ifa->idev->dev->ifindex);
3855
1da177e4 3856 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3857 preferred = ifa->prefered_lft;
3858 valid = ifa->valid_lft;
3859 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3860 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3861 if (preferred > tval)
3862 preferred -= tval;
3863 else
3864 preferred = 0;
f56619fc
BH		 3865 if (valid != INFINITY_LIFE_TIME) {
3866 if (valid > tval)
3867 valid -= tval;
3868 else
3869 valid = 0;
3870 }
1da177e4
LT		 3871 }
3872 } else {
85486af0
TG		 3873 preferred = INFINITY_LIFE_TIME;
3874 valid = INFINITY_LIFE_TIME;
3875 }
3876
7996c799 3877 if (!ipv6_addr_any(&ifa->peer_addr)) {
caeaba79
ND		 3878 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3879 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3880 goto error;
3881 } else
3882 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3883 goto error;
3884
3885 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3886 goto error;
1da177e4 3887
0ab6803b 3888 return nlmsg_end(skb, nlh);
caeaba79
ND		 3889
3890error:
3891 nlmsg_cancel(skb, nlh);
3892 return -EMSGSIZE;
1da177e4
LT		 3893}
3894
3895static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 3896 u32 portid, u32 seq, int event, u16 flags)
1da177e4 3897{
1da177e4 3898 struct nlmsghdr *nlh;
101bb229
TG		 3899 u8 scope = RT_SCOPE_UNIVERSE;
3900 int ifindex = ifmca->idev->dev->ifindex;
3901
3902 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3903 scope = RT_SCOPE_SITE;
1da177e4 3904
15e47304 3905 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3906 if (nlh == NULL)
26932566 3907 return -EMSGSIZE;
85486af0 3908
0ab6803b
TG		 3909 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3910 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3911 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3912 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3913 nlmsg_cancel(skb, nlh);
3914 return -EMSGSIZE;
3915 }
85486af0 3916
0ab6803b 3917 return nlmsg_end(skb, nlh);
1da177e4
LT		 3918}
3919
3920static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 3921 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3922{
1da177e4 3923 struct nlmsghdr *nlh;
101bb229
TG		 3924 u8 scope = RT_SCOPE_UNIVERSE;
3925 int ifindex = ifaca->aca_idev->dev->ifindex;
3926
3927 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3928 scope = RT_SCOPE_SITE;
1da177e4 3929
15e47304 3930 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3931 if (nlh == NULL)
26932566 3932 return -EMSGSIZE;
85486af0 3933
0ab6803b
TG		 3934 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3935 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3936 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3937 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3938 nlmsg_cancel(skb, nlh);
3939 return -EMSGSIZE;
3940 }
1da177e4 3941
0ab6803b 3942 return nlmsg_end(skb, nlh);
1da177e4
LT		 3943}
3944
e21e8467 3945enum addr_type_t {
1da177e4
LT		 3946 UNICAST_ADDR,
3947 MULTICAST_ADDR,
3948 ANYCAST_ADDR,
3949};
3950
234b27c3
ED		 3951/* called with rcu_read_lock() */
3952static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3953 struct netlink_callback *cb, enum addr_type_t type,
3954 int s_ip_idx, int *p_ip_idx)
3955{
234b27c3
ED		 3956 struct ifmcaddr6 *ifmca;
3957 struct ifacaddr6 *ifaca;
3958 int err = 1;
3959 int ip_idx = *p_ip_idx;
3960
3961 read_lock_bh(&idev->lock);
3962 switch (type) {
502a2ffd 3963 case UNICAST_ADDR: {
3964 struct inet6_ifaddr *ifa;
3965
234b27c3 3966 /* unicast address incl. temp addr */
502a2ffd 3967 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3968 if (++ip_idx < s_ip_idx)
234b27c3
ED		 3969 continue;
3970 err = inet6_fill_ifaddr(skb, ifa,
15e47304 3971 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3972 cb->nlh->nlmsg_seq,
3973 RTM_NEWADDR,
3974 NLM_F_MULTI);
3975 if (err <= 0)
3976 break;
63998ac2 3977 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 3978 }
3979 break;
502a2ffd 3980 }
234b27c3
ED		 3981 case MULTICAST_ADDR:
3982 /* multicast address */
3983 for (ifmca = idev->mc_list; ifmca;
3984 ifmca = ifmca->next, ip_idx++) {
3985 if (ip_idx < s_ip_idx)
3986 continue;
3987 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 3988 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3989 cb->nlh->nlmsg_seq,
3990 RTM_GETMULTICAST,
3991 NLM_F_MULTI);
3992 if (err <= 0)
3993 break;
3994 }
3995 break;
3996 case ANYCAST_ADDR:
3997 /* anycast address */
3998 for (ifaca = idev->ac_list; ifaca;
3999 ifaca = ifaca->aca_next, ip_idx++) {
4000 if (ip_idx < s_ip_idx)
4001 continue;
4002 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4003 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4004 cb->nlh->nlmsg_seq,
4005 RTM_GETANYCAST,
4006 NLM_F_MULTI);
4007 if (err <= 0)
4008 break;
4009 }
4010 break;
4011 default:
4012 break;
4013 }
4014 read_unlock_bh(&idev->lock);
4015 *p_ip_idx = ip_idx;
4016 return err;
4017}
4018
1da177e4
LT		 4019static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4020 enum addr_type_t type)
4021{
234b27c3
ED		 4022 struct net *net = sock_net(skb->sk);
4023 int h, s_h;
1da177e4
LT		 4024 int idx, ip_idx;
4025 int s_idx, s_ip_idx;
1da177e4 4026 struct net_device *dev;
234b27c3
ED		 4027 struct inet6_dev *idev;
4028 struct hlist_head *head;
1ab1457c 4029
234b27c3
ED		 4030 s_h = cb->args[0];
4031 s_idx = idx = cb->args[1];
4032 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4033
234b27c3 4034 rcu_read_lock();
63998ac2 4035 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4036 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4037 idx = 0;
4038 head = &net->dev_index_head[h];
b67bfe0d 4039 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4040 if (idx < s_idx)
4041 goto cont;
4b97efdf 4042 if (h > s_h || idx > s_idx)
234b27c3
ED		 4043 s_ip_idx = 0;
4044 ip_idx = 0;
e21e8467
SH		 4045 idev = __in6_dev_get(dev);
4046 if (!idev)
234b27c3
ED		 4047 goto cont;
4048
4049 if (in6_dump_addrs(idev, skb, cb, type,
4050 s_ip_idx, &ip_idx) <= 0)
4051 goto done;
7562f876 4052cont:
234b27c3
ED		 4053 idx++;
4054 }
1da177e4 4055 }
234b27c3
ED		 4056done:
4057 rcu_read_unlock();
4058 cb->args[0] = h;
4059 cb->args[1] = idx;
4060 cb->args[2] = ip_idx;
4061
1da177e4
LT		 4062 return skb->len;
4063}
4064
4065static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4066{
4067 enum addr_type_t type = UNICAST_ADDR;
b854272b 4068
1da177e4
LT		 4069 return inet6_dump_addr(skb, cb, type);
4070}
4071
4072static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4073{
4074 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4075
1da177e4
LT		 4076 return inet6_dump_addr(skb, cb, type);
4077}
4078
4079
4080static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4081{
4082 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4083
1da177e4
LT		 4084 return inet6_dump_addr(skb, cb, type);
4085}
4086
661d2967 4087static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4088{
3b1e0a65 4089 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4090 struct ifaddrmsg *ifm;
4091 struct nlattr *tb[IFA_MAX+1];
caeaba79 4092 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4093 struct net_device *dev = NULL;
4094 struct inet6_ifaddr *ifa;
4095 struct sk_buff *skb;
6c223828
NT		 4096 int err;
4097
1b29fc2c
TG		 4098 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4099 if (err < 0)
4100 goto errout;
4101
caeaba79 4102 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
1b29fc2c
TG		 4103 if (addr == NULL) {
4104 err = -EINVAL;
4105 goto errout;
6c223828 4106 }
6c223828 4107
1b29fc2c 4108 ifm = nlmsg_data(nlh);
6c223828 4109 if (ifm->ifa_index)
6fda7350 4110 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4111
e21e8467
SH		 4112 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4113 if (!ifa) {
1b29fc2c
TG		 4114 err = -EADDRNOTAVAIL;
4115 goto errout;
4116 }
6c223828 4117
e21e8467
SH		 4118 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4119 if (!skb) {
6c223828 4120 err = -ENOBUFS;
1b29fc2c 4121 goto errout_ifa;
6c223828
NT		 4122 }
4123
15e47304 4124 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4125 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4126 if (err < 0) {
4127 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4128 WARN_ON(err == -EMSGSIZE);
4129 kfree_skb(skb);
4130 goto errout_ifa;
4131 }
15e47304 4132 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4133errout_ifa:
6c223828 4134 in6_ifa_put(ifa);
1b29fc2c 4135errout:
6c223828 4136 return err;
6c223828
NT		 4137}
4138
1da177e4
LT		 4139static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4140{
4141 struct sk_buff *skb;
c346dca1 4142 struct net *net = dev_net(ifa->idev->dev);
5d620266 4143 int err = -ENOBUFS;
1da177e4 4144
0ab6803b 4145 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 4146 if (skb == NULL)
4147 goto errout;
4148
4149 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4150 if (err < 0) {
4151 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4152 WARN_ON(err == -EMSGSIZE);
4153 kfree_skb(skb);
4154 goto errout;
4155 }
1ce85fe4
PNA		 4156 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4157 return;
5d620266
TG		 4158errout:
4159 if (err < 0)
6fda7350 4160 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4161}
4162
b6f99a21 4163static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4164 __s32 *array, int bytes)
4165{
04561c1f
TG		 4166 BUG_ON(bytes < (DEVCONF_MAX * 4));
4167
1da177e4
LT		 4168 memset(array, 0, bytes);
4169 array[DEVCONF_FORWARDING] = cnf->forwarding;
4170 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4171 array[DEVCONF_MTU6] = cnf->mtu6;
4172 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4173 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4174 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4175 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4176 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4177 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4178 jiffies_to_msecs(cnf->rtr_solicit_interval);
4179 array[DEVCONF_RTR_SOLICIT_DELAY] =
4180 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4
LT		 4181 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4182#ifdef CONFIG_IPV6_PRIVACY
4183 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4184 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4185 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4186 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4187 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4188#endif
4189 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4190 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 4191 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4192#ifdef CONFIG_IPV6_ROUTER_PREF
4193 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4194 array[DEVCONF_RTR_PROBE_INTERVAL] =
4195 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4196#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4197 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4198#endif
930d6ff2 4199#endif
fbea49e1 4200 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4201 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4202#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4203 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4204#endif
7bc570c8
YH		 4205#ifdef CONFIG_IPV6_MROUTE
4206 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4207#endif
778d80be 4208 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4209 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4210 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4211 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
1da177e4
LT		 4212}
4213
b382b191
TG		 4214static inline size_t inet6_ifla6_size(void)
4215{
4216 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4217 + nla_total_size(sizeof(struct ifla_cacheinfo))
4218 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4219 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4220 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4221 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4222}
4223
339bf98f
TG		 4224static inline size_t inet6_if_nlmsg_size(void)
4225{
4226 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4227 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4228 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4229 + nla_total_size(4) /* IFLA_MTU */
4230 + nla_total_size(4) /* IFLA_LINK */
b382b191 4231 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4232}
c5396a31 4233
be281e55 4234static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4235 int items, int bytes)
7f7d9a6b
HX		 4236{
4237 int i;
4238 int pad = bytes - sizeof(u64) * items;
4239 BUG_ON(pad < 0);
4240
4241 /* Use put_unaligned() because stats may not be aligned for u64. */
4242 put_unaligned(items, &stats[0]);
4243 for (i = 1; i < items; i++)
be281e55 4244 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4245
4246 memset(&stats[items], 0, pad);
4247}
4248
4ce3c183
ED		 4249static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4250 int items, int bytes, size_t syncpoff)
4251{
4252 int i;
4253 int pad = bytes - sizeof(u64) * items;
4254 BUG_ON(pad < 0);
4255
4256 /* Use put_unaligned() because stats may not be aligned for u64. */
4257 put_unaligned(items, &stats[0]);
4258 for (i = 1; i < items; i++)
4259 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4260
4261 memset(&stats[items], 0, pad);
4262}
4263
7f7d9a6b
HX		 4264static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4265 int bytes)
4266{
e21e8467 4267 switch (attrtype) {
7f7d9a6b 4268 case IFLA_INET6_STATS:
4ce3c183
ED		 4269 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4270 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4271 break;
4272 case IFLA_INET6_ICMP6STATS:
be281e55 4273 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4274 break;
4275 }
4276}
4277
b382b191
TG		 4278static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4279{
4280 struct nlattr *nla;
4281 struct ifla_cacheinfo ci;
4282
c78679e8
DM		 4283 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4284 goto nla_put_failure;
b382b191 4285 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4286 ci.tstamp = cstamp_delta(idev->tstamp);
4287 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4288 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
c78679e8
DM		 4289 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4290 goto nla_put_failure;
b382b191
TG		 4291 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4292 if (nla == NULL)
4293 goto nla_put_failure;
4294 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4295
4296 /* XXX - MC not implemented */
4297
4298 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4299 if (nla == NULL)
4300 goto nla_put_failure;
4301 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4302
4303 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4304 if (nla == NULL)
4305 goto nla_put_failure;
4306 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4307
f53adae4
DB		 4308 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4309 if (nla == NULL)
4310 goto nla_put_failure;
4311 read_lock_bh(&idev->lock);
4312 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4313 read_unlock_bh(&idev->lock);
4314
b382b191
TG		 4315 return 0;
4316
4317nla_put_failure:
4318 return -EMSGSIZE;
4319}
4320
4321static size_t inet6_get_link_af_size(const struct net_device *dev)
4322{
4323 if (!__in6_dev_get(dev))
4324 return 0;
4325
4326 return inet6_ifla6_size();
4327}
4328
4329static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4330{
4331 struct inet6_dev *idev = __in6_dev_get(dev);
4332
4333 if (!idev)
4334 return -ENODATA;
4335
4336 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4337 return -EMSGSIZE;
4338
4339 return 0;
4340}
4341
f53adae4
DB		 4342static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4343{
f53adae4
DB		 4344 struct inet6_ifaddr *ifp;
4345 struct net_device *dev = idev->dev;
fc403832 4346 bool update_rs = false;
dc848292 4347 struct in6_addr ll_addr;
f53adae4
DB		 4348
4349 if (token == NULL)
4350 return -EINVAL;
4351 if (ipv6_addr_any(token))
4352 return -EINVAL;
4353 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4354 return -EINVAL;
f53adae4
DB		 4355 if (!ipv6_accept_ra(idev))
4356 return -EINVAL;
4357 if (idev->cnf.rtr_solicits <= 0)
4358 return -EINVAL;
4359
4360 write_lock_bh(&idev->lock);
4361
4362 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4363 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4364
4365 write_unlock_bh(&idev->lock);
4366
dc848292
HFS		 4367 if (!idev->dead && (idev->if_flags & IF_READY) &&
4368 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4369 IFA_F_OPTIMISTIC)) {
fc403832
DB		 4370
4371 /* If we're not ready, then normal ifup will take care
4372 * of this. Otherwise, we need to request our rs here.
4373 */
4374 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4375 update_rs = true;
4376 }
f53adae4
DB		 4377
4378 write_lock_bh(&idev->lock);
fc403832 4379
77ecaace 4380 if (update_rs) {
fc403832 4381 idev->if_flags |= IF_RS_SENT;
77ecaace
HFS		 4382 idev->rs_probes = 1;
4383 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4384 }
f53adae4
DB		 4385
4386 /* Well, that's kinda nasty ... */
4387 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4388 spin_lock(&ifp->lock);
617fe29d 4389 if (ifp->tokenized) {
f53adae4
DB		 4390 ifp->valid_lft = 0;
4391 ifp->prefered_lft = 0;
4392 }
4393 spin_unlock(&ifp->lock);
4394 }
4395
4396 write_unlock_bh(&idev->lock);
2b9651d7 4397 addrconf_verify(0);
f53adae4
DB		 4398 return 0;
4399}
4400
4401static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4402{
4403 int err = -EINVAL;
4404 struct inet6_dev *idev = __in6_dev_get(dev);
4405 struct nlattr *tb[IFLA_INET6_MAX + 1];
4406
4407 if (!idev)
4408 return -EAFNOSUPPORT;
4409
4410 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4411 BUG();
4412
4413 if (tb[IFLA_INET6_TOKEN])
4414 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4415
4416 return err;
4417}
4418
1ab1457c 4419static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4420 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4421{
04561c1f 4422 struct net_device *dev = idev->dev;
04561c1f
TG		 4423 struct ifinfomsg *hdr;
4424 struct nlmsghdr *nlh;
4425 void *protoinfo;
04561c1f 4426
15e47304 4427 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
04561c1f 4428 if (nlh == NULL)
26932566 4429 return -EMSGSIZE;
04561c1f
TG		 4430
4431 hdr = nlmsg_data(nlh);
4432 hdr->ifi_family = AF_INET6;
4433 hdr->__ifi_pad = 0;
4434 hdr->ifi_type = dev->type;
4435 hdr->ifi_index = dev->ifindex;
4436 hdr->ifi_flags = dev_get_flags(dev);
4437 hdr->ifi_change = 0;
4438
c78679e8
DM		 4439 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4440 (dev->addr_len &&
4441 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4442 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4443 (dev->ifindex != dev->iflink &&
4444 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4445 goto nla_put_failure;
04561c1f
TG		 4446 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4447 if (protoinfo == NULL)
4448 goto nla_put_failure;
1da177e4 4449
b382b191 4450 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4451 goto nla_put_failure;
1da177e4 4452
04561c1f
TG		 4453 nla_nest_end(skb, protoinfo);
4454 return nlmsg_end(skb, nlh);
1da177e4 4455
04561c1f 4456nla_put_failure:
26932566
PM		 4457 nlmsg_cancel(skb, nlh);
4458 return -EMSGSIZE;
1da177e4
LT		 4459}
4460
4461static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4462{
3b1e0a65 4463 struct net *net = sock_net(skb->sk);
84d2697d 4464 int h, s_h;
434a8a58 4465 int idx = 0, s_idx;
1da177e4
LT		 4466 struct net_device *dev;
4467 struct inet6_dev *idev;
84d2697d 4468 struct hlist_head *head;
1da177e4 4469
84d2697d
ED		 4470 s_h = cb->args[0];
4471 s_idx = cb->args[1];
4472
4473 rcu_read_lock();
4474 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4475 idx = 0;
4476 head = &net->dev_index_head[h];
b67bfe0d 4477 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 4478 if (idx < s_idx)
4479 goto cont;
4480 idev = __in6_dev_get(dev);
4481 if (!idev)
4482 goto cont;
4483 if (inet6_fill_ifinfo(skb, idev,
15e47304 4484 NETLINK_CB(cb->skb).portid,
84d2697d
ED		 4485 cb->nlh->nlmsg_seq,
4486 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4487 goto out;
7562f876 4488cont:
84d2697d
ED		 4489 idx++;
4490 }
1da177e4 4491 }
84d2697d
ED		 4492out:
4493 rcu_read_unlock();
4494 cb->args[1] = idx;
4495 cb->args[0] = h;
1da177e4
LT		 4496
4497 return skb->len;
4498}
4499
4500void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4501{
4502 struct sk_buff *skb;
c346dca1 4503 struct net *net = dev_net(idev->dev);
8d7a76c9 4504 int err = -ENOBUFS;
1ab1457c 4505
339bf98f 4506 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4507 if (skb == NULL)
4508 goto errout;
4509
4510 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4511 if (err < 0) {
4512 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4513 WARN_ON(err == -EMSGSIZE);
4514 kfree_skb(skb);
4515 goto errout;
4516 }
5f75a104 4517 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4518 return;
8d7a76c9
TG		 4519errout:
4520 if (err < 0)
5f75a104 4521 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4522}
4523
339bf98f
TG		 4524static inline size_t inet6_prefix_nlmsg_size(void)
4525{
4526 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4527 + nla_total_size(sizeof(struct in6_addr))
4528 + nla_total_size(sizeof(struct prefix_cacheinfo));
4529}
c5396a31 4530
1da177e4 4531static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4532 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 4533 int event, unsigned int flags)
1da177e4 4534{
6051e2f4
TG		 4535 struct prefixmsg *pmsg;
4536 struct nlmsghdr *nlh;
1da177e4
LT		 4537 struct prefix_cacheinfo ci;
4538
15e47304 4539 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6051e2f4 4540 if (nlh == NULL)
26932566 4541 return -EMSGSIZE;
6051e2f4
TG		 4542
4543 pmsg = nlmsg_data(nlh);
1da177e4 4544 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4545 pmsg->prefix_pad1 = 0;
4546 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4547 pmsg->prefix_ifindex = idev->dev->ifindex;
4548 pmsg->prefix_len = pinfo->prefix_len;
4549 pmsg->prefix_type = pinfo->type;
8a47077a 4550 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4551 pmsg->prefix_flags = 0;
4552 if (pinfo->onlink)
4553 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4554 if (pinfo->autoconf)
4555 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4556
c78679e8
DM		 4557 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4558 goto nla_put_failure;
1da177e4
LT		 4559 ci.preferred_time = ntohl(pinfo->prefered);
4560 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 4561 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4562 goto nla_put_failure;
6051e2f4 4563 return nlmsg_end(skb, nlh);
1da177e4 4564
6051e2f4 4565nla_put_failure:
26932566
PM		 4566 nlmsg_cancel(skb, nlh);
4567 return -EMSGSIZE;
1da177e4
LT		 4568}
4569
1ab1457c 4570static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4571 struct prefix_info *pinfo)
4572{
4573 struct sk_buff *skb;
c346dca1 4574 struct net *net = dev_net(idev->dev);
8c384bfa 4575 int err = -ENOBUFS;
1da177e4 4576
339bf98f 4577 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4578 if (skb == NULL)
4579 goto errout;
4580
4581 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4582 if (err < 0) {
4583 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4584 WARN_ON(err == -EMSGSIZE);
4585 kfree_skb(skb);
4586 goto errout;
4587 }
1ce85fe4
PNA		 4588 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4589 return;
8c384bfa
TG		 4590errout:
4591 if (err < 0)
6fda7350 4592 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4593}
4594
1ec047eb
HFS		 4595static void update_valid_ll_addr_cnt(struct inet6_ifaddr *ifp, int count)
4596{
4597 write_lock_bh(&ifp->idev->lock);
4598 spin_lock(&ifp->lock);
4599 if (((ifp->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|
4600 IFA_F_DADFAILED)) == IFA_F_PERMANENT) &&
4601 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL))
4602 ifp->idev->valid_ll_addr_cnt += count;
4603 WARN_ON(ifp->idev->valid_ll_addr_cnt < 0);
4604 spin_unlock(&ifp->lock);
4605 write_unlock_bh(&ifp->idev->lock);
4606}
4607
1da177e4
LT		 4608static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4609{
63998ac2
ND		 4610 struct net *net = dev_net(ifp->idev->dev);
4611
1da177e4
LT		 4612 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4613
4614 switch (event) {
4615 case RTM_NEWADDR:
1ec047eb
HFS		 4616 update_valid_ll_addr_cnt(ifp, 1);
4617
95c385b4
NH		 4618 /*
4619 * If the address was optimistic
4620 * we inserted the route at the start of
4621 * our DAD process, so we don't need
4622 * to do it again
4623 */
4624 if (!(ifp->rt->rt6i_node))
4625 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4626 if (ifp->idev->cnf.forwarding)
4627 addrconf_join_anycast(ifp);
7996c799 4628 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 4629 addrconf_prefix_route(&ifp->peer_addr, 128,
4630 ifp->idev->dev, 0, 0);
1da177e4
LT		 4631 break;
4632 case RTM_DELADDR:
1ec047eb
HFS		 4633 update_valid_ll_addr_cnt(ifp, -1);
4634
1da177e4
LT		 4635 if (ifp->idev->cnf.forwarding)
4636 addrconf_leave_anycast(ifp);
4637 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 4638 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79
ND		 4639 struct rt6_info *rt;
4640 struct net_device *dev = ifp->idev->dev;
4641
4642 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4643 dev->ifindex, 1);
4644 if (rt) {
4645 dst_hold(&rt->dst);
4646 if (ip6_del_rt(rt))
4647 dst_free(&rt->dst);
4648 }
4649 }
d8d1f30b 4650 dst_hold(&ifp->rt->dst);
93fa159a 4651
73a8bd74 4652 if (ip6_del_rt(ifp->rt))
d8d1f30b 4653 dst_free(&ifp->rt->dst);
1da177e4
LT		 4654 break;
4655 }
63998ac2 4656 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 4657}
4658
4659static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4660{
8814c4b5 4661 rcu_read_lock_bh();
1da177e4
LT		 4662 if (likely(ifp->idev->dead == 0))
4663 __ipv6_ifa_notify(event, ifp);
8814c4b5 4664 rcu_read_unlock_bh();
1da177e4
LT		 4665}
4666
4667#ifdef CONFIG_SYSCTL
4668
4669static
fe2c6338 4670int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 4671 void __user *buffer, size_t *lenp, loff_t *ppos)
4672{
4673 int *valp = ctl->data;
4674 int val = *valp;
88af182e 4675 loff_t pos = *ppos;
fe2c6338 4676 struct ctl_table lctl;
1da177e4
LT		 4677 int ret;
4678
013d97e9
FR		 4679 /*
4680 * ctl->data points to idev->cnf.forwarding, we should
4681 * not modify it until we get the rtnl lock.
4682 */
4683 lctl = *ctl;
4684 lctl.data = &val;
4685
4686 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 4687
c8fecf22 4688 if (write)
b325fddb 4689 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4690 if (ret)
4691 *ppos = pos;
1ab1457c 4692 return ret;
1da177e4
LT		 4693}
4694
56d417b1
BH		 4695static void dev_disable_change(struct inet6_dev *idev)
4696{
75538c2b
CW		 4697 struct netdev_notifier_info info;
4698
56d417b1
BH		 4699 if (!idev || !idev->dev)
4700 return;
4701
75538c2b 4702 netdev_notifier_info_init(&info, idev->dev);
56d417b1 4703 if (idev->cnf.disable_ipv6)
75538c2b 4704 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 4705 else
75538c2b 4706 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 4707}
4708
4709static void addrconf_disable_change(struct net *net, __s32 newf)
4710{
4711 struct net_device *dev;
4712 struct inet6_dev *idev;
4713
c6d14c84
ED		 4714 rcu_read_lock();
4715 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4716 idev = __in6_dev_get(dev);
4717 if (idev) {
4718 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4719 idev->cnf.disable_ipv6 = newf;
4720 if (changed)
4721 dev_disable_change(idev);
4722 }
56d417b1 4723 }
c6d14c84 4724 rcu_read_unlock();
56d417b1
BH		 4725}
4726
013d97e9 4727static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 4728{
4729 struct net *net;
013d97e9
FR		 4730 int old;
4731
4732 if (!rtnl_trylock())
4733 return restart_syscall();
56d417b1
BH		 4734
4735 net = (struct net *)table->extra2;
013d97e9
FR		 4736 old = *p;
4737 *p = newf;
56d417b1 4738
013d97e9
FR		 4739 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4740 rtnl_unlock();
56d417b1 4741 return 0;
88af182e 4742 }
56d417b1
BH		 4743
4744 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 4745 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4746 addrconf_disable_change(net, newf);
013d97e9 4747 } else if ((!newf) ^ (!old))
56d417b1
BH		 4748 dev_disable_change((struct inet6_dev *)table->extra1);
4749
4750 rtnl_unlock();
4751 return 0;
4752}
4753
4754static
fe2c6338 4755int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 4756 void __user *buffer, size_t *lenp, loff_t *ppos)
4757{
4758 int *valp = ctl->data;
4759 int val = *valp;
88af182e 4760 loff_t pos = *ppos;
fe2c6338 4761 struct ctl_table lctl;
56d417b1
BH		 4762 int ret;
4763
013d97e9
FR		 4764 /*
4765 * ctl->data points to idev->cnf.disable_ipv6, we should
4766 * not modify it until we get the rtnl lock.
4767 */
4768 lctl = *ctl;
4769 lctl.data = &val;
4770
4771 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 4772
4773 if (write)
4774 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4775 if (ret)
4776 *ppos = pos;
56d417b1
BH		 4777 return ret;
4778}
4779
1da177e4
LT		 4780static struct addrconf_sysctl_table
4781{
4782 struct ctl_table_header *sysctl_header;
fe2c6338 4783 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 4784} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4785 .sysctl_header = NULL,
4786 .addrconf_vars = {
1ab1457c 4787 {
e21e8467
SH		 4788 .procname = "forwarding",
4789 .data = &ipv6_devconf.forwarding,
4790 .maxlen = sizeof(int),
4791 .mode = 0644,
4792 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4793 },
4794 {
e21e8467
SH		 4795 .procname = "hop_limit",
4796 .data = &ipv6_devconf.hop_limit,
4797 .maxlen = sizeof(int),
4798 .mode = 0644,
4799 .proc_handler = proc_dointvec,
1da177e4
LT		 4800 },
4801 {
e21e8467
SH		 4802 .procname = "mtu",
4803 .data = &ipv6_devconf.mtu6,
4804 .maxlen = sizeof(int),
4805 .mode = 0644,
4806 .proc_handler = proc_dointvec,
1da177e4
LT		 4807 },
4808 {
e21e8467
SH		 4809 .procname = "accept_ra",
4810 .data = &ipv6_devconf.accept_ra,
4811 .maxlen = sizeof(int),
4812 .mode = 0644,
4813 .proc_handler = proc_dointvec,
1da177e4
LT		 4814 },
4815 {
e21e8467
SH		 4816 .procname = "accept_redirects",
4817 .data = &ipv6_devconf.accept_redirects,
4818 .maxlen = sizeof(int),
4819 .mode = 0644,
4820 .proc_handler = proc_dointvec,
1da177e4
LT		 4821 },
4822 {
e21e8467
SH		 4823 .procname = "autoconf",
4824 .data = &ipv6_devconf.autoconf,
4825 .maxlen = sizeof(int),
4826 .mode = 0644,
4827 .proc_handler = proc_dointvec,
1da177e4
LT		 4828 },
4829 {
e21e8467
SH		 4830 .procname = "dad_transmits",
4831 .data = &ipv6_devconf.dad_transmits,
4832 .maxlen = sizeof(int),
4833 .mode = 0644,
4834 .proc_handler = proc_dointvec,
1da177e4
LT		 4835 },
4836 {
e21e8467
SH		 4837 .procname = "router_solicitations",
4838 .data = &ipv6_devconf.rtr_solicits,
4839 .maxlen = sizeof(int),
4840 .mode = 0644,
4841 .proc_handler = proc_dointvec,
1da177e4
LT		 4842 },
4843 {
e21e8467
SH		 4844 .procname = "router_solicitation_interval",
4845 .data = &ipv6_devconf.rtr_solicit_interval,
4846 .maxlen = sizeof(int),
4847 .mode = 0644,
4848 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4849 },
4850 {
e21e8467
SH		 4851 .procname = "router_solicitation_delay",
4852 .data = &ipv6_devconf.rtr_solicit_delay,
4853 .maxlen = sizeof(int),
4854 .mode = 0644,
4855 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4856 },
4857 {
e21e8467
SH		 4858 .procname = "force_mld_version",
4859 .data = &ipv6_devconf.force_mld_version,
4860 .maxlen = sizeof(int),
4861 .mode = 0644,
4862 .proc_handler = proc_dointvec,
1da177e4
LT		 4863 },
4864#ifdef CONFIG_IPV6_PRIVACY
4865 {
e21e8467
SH		 4866 .procname = "use_tempaddr",
4867 .data = &ipv6_devconf.use_tempaddr,
4868 .maxlen = sizeof(int),
4869 .mode = 0644,
4870 .proc_handler = proc_dointvec,
1da177e4
LT		 4871 },
4872 {
e21e8467
SH		 4873 .procname = "temp_valid_lft",
4874 .data = &ipv6_devconf.temp_valid_lft,
4875 .maxlen = sizeof(int),
4876 .mode = 0644,
4877 .proc_handler = proc_dointvec,
1da177e4
LT		 4878 },
4879 {
e21e8467
SH		 4880 .procname = "temp_prefered_lft",
4881 .data = &ipv6_devconf.temp_prefered_lft,
4882 .maxlen = sizeof(int),
4883 .mode = 0644,
4884 .proc_handler = proc_dointvec,
1da177e4
LT		 4885 },
4886 {
e21e8467
SH		 4887 .procname = "regen_max_retry",
4888 .data = &ipv6_devconf.regen_max_retry,
4889 .maxlen = sizeof(int),
4890 .mode = 0644,
4891 .proc_handler = proc_dointvec,
1da177e4
LT		 4892 },
4893 {
e21e8467
SH		 4894 .procname = "max_desync_factor",
4895 .data = &ipv6_devconf.max_desync_factor,
4896 .maxlen = sizeof(int),
4897 .mode = 0644,
4898 .proc_handler = proc_dointvec,
1da177e4
LT		 4899 },
4900#endif
4901 {
e21e8467
SH		 4902 .procname = "max_addresses",
4903 .data = &ipv6_devconf.max_addresses,
4904 .maxlen = sizeof(int),
4905 .mode = 0644,
4906 .proc_handler = proc_dointvec,
1da177e4 4907 },
65f5c7c1 4908 {
e21e8467
SH		 4909 .procname = "accept_ra_defrtr",
4910 .data = &ipv6_devconf.accept_ra_defrtr,
4911 .maxlen = sizeof(int),
4912 .mode = 0644,
4913 .proc_handler = proc_dointvec,
65f5c7c1 4914 },
c4fd30eb 4915 {
e21e8467
SH		 4916 .procname = "accept_ra_pinfo",
4917 .data = &ipv6_devconf.accept_ra_pinfo,
4918 .maxlen = sizeof(int),
4919 .mode = 0644,
4920 .proc_handler = proc_dointvec,
c4fd30eb 4921 },
930d6ff2
YH		 4922#ifdef CONFIG_IPV6_ROUTER_PREF
4923 {
e21e8467
SH		 4924 .procname = "accept_ra_rtr_pref",
4925 .data = &ipv6_devconf.accept_ra_rtr_pref,
4926 .maxlen = sizeof(int),
4927 .mode = 0644,
4928 .proc_handler = proc_dointvec,
930d6ff2 4929 },
52e16356 4930 {
e21e8467
SH		 4931 .procname = "router_probe_interval",
4932 .data = &ipv6_devconf.rtr_probe_interval,
4933 .maxlen = sizeof(int),
4934 .mode = 0644,
4935 .proc_handler = proc_dointvec_jiffies,
52e16356 4936 },
fa03ef38 4937#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4938 {
e21e8467
SH		 4939 .procname = "accept_ra_rt_info_max_plen",
4940 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4941 .maxlen = sizeof(int),
4942 .mode = 0644,
4943 .proc_handler = proc_dointvec,
09c884d4
YH		 4944 },
4945#endif
930d6ff2 4946#endif
fbea49e1 4947 {
e21e8467
SH		 4948 .procname = "proxy_ndp",
4949 .data = &ipv6_devconf.proxy_ndp,
4950 .maxlen = sizeof(int),
4951 .mode = 0644,
4952 .proc_handler = proc_dointvec,
fbea49e1 4953 },
0bcbc926 4954 {
e21e8467
SH		 4955 .procname = "accept_source_route",
4956 .data = &ipv6_devconf.accept_source_route,
4957 .maxlen = sizeof(int),
4958 .mode = 0644,
4959 .proc_handler = proc_dointvec,
0bcbc926 4960 },
95c385b4
NH		 4961#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4962 {
e21e8467
SH		 4963 .procname = "optimistic_dad",
4964 .data = &ipv6_devconf.optimistic_dad,
4965 .maxlen = sizeof(int),
4966 .mode = 0644,
4967 .proc_handler = proc_dointvec,
95c385b4
NH		 4968
4969 },
7bc570c8
YH		 4970#endif
4971#ifdef CONFIG_IPV6_MROUTE
4972 {
e21e8467
SH		 4973 .procname = "mc_forwarding",
4974 .data = &ipv6_devconf.mc_forwarding,
4975 .maxlen = sizeof(int),
4976 .mode = 0444,
4977 .proc_handler = proc_dointvec,
7bc570c8 4978 },
95c385b4 4979#endif
778d80be 4980 {
e21e8467
SH		 4981 .procname = "disable_ipv6",
4982 .data = &ipv6_devconf.disable_ipv6,
4983 .maxlen = sizeof(int),
4984 .mode = 0644,
4985 .proc_handler = addrconf_sysctl_disable,
778d80be 4986 },
1b34be74 4987 {
e21e8467
SH		 4988 .procname = "accept_dad",
4989 .data = &ipv6_devconf.accept_dad,
4990 .maxlen = sizeof(int),
4991 .mode = 0644,
4992 .proc_handler = proc_dointvec,
1b34be74 4993 },
f7734fdf 4994 {
f7734fdf
OP		 4995 .procname = "force_tllao",
4996 .data = &ipv6_devconf.force_tllao,
4997 .maxlen = sizeof(int),
4998 .mode = 0644,
4999 .proc_handler = proc_dointvec
5000 },
5cb04436
HFS		 5001 {
5002 .procname = "ndisc_notify",
5003 .data = &ipv6_devconf.ndisc_notify,
5004 .maxlen = sizeof(int),
5005 .mode = 0644,
5006 .proc_handler = proc_dointvec
5007 },
1da177e4 5008 {
f8572d8f 5009 /* sentinel */
1da177e4
LT		 5010 }
5011 },
1da177e4
LT		 5012};
5013
bff16c2f 5014static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 5015 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 5016{
5017 int i;
1da177e4 5018 struct addrconf_sysctl_table *t;
6105e293 5019 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 5020
af879cc7 5021 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 5022 if (t == NULL)
f68635e6
PE		 5023 goto out;
5024
bcdd553f 5025 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 5026 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 5027 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 5028 t->addrconf_vars[i].extra2 = net;
1da177e4 5029 }
1da177e4 5030
6105e293 5031 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 5032
6105e293 5033 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
1da177e4 5034 if (t->sysctl_header == NULL)
6105e293 5035 goto free;
f68635e6
PE		 5036
5037 p->sysctl = t;
95897312 5038 return 0;
1da177e4 5039
f68635e6 5040free:
1da177e4 5041 kfree(t);
f68635e6 5042out:
95897312 5043 return -ENOBUFS;
1da177e4
LT		 5044}
5045
408c4768
PE		 5046static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5047{
5048 struct addrconf_sysctl_table *t;
5049
5050 if (p->sysctl == NULL)
5051 return;
5052
5053 t = p->sysctl;
5054 p->sysctl = NULL;
ff538818 5055 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 5056 kfree(t);
5057}
5058
f52295a9
PE		 5059static void addrconf_sysctl_register(struct inet6_dev *idev)
5060{
54716e3b 5061 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 5062 &ndisc_ifinfo_sysctl_change);
c346dca1 5063 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 5064 idev, &idev->cnf);
f52295a9
PE		 5065}
5066
408c4768 5067static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 5068{
408c4768
PE		 5069 __addrconf_sysctl_unregister(&idev->cnf);
5070 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 5071}
5072
5073
5074#endif
5075
2c8c1e72 5076static int __net_init addrconf_init_net(struct net *net)
e0da5a48 5077{
a79ca223 5078 int err = -ENOMEM;
e0da5a48
PE		 5079 struct ipv6_devconf *all, *dflt;
5080
a79ca223
HZ		 5081 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5082 if (all == NULL)
5083 goto err_alloc_all;
e0da5a48 5084
a79ca223
HZ		 5085 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5086 if (dflt == NULL)
5087 goto err_alloc_dflt;
e0da5a48 5088
a79ca223
HZ		 5089 /* these will be inherited by all namespaces */
5090 dflt->autoconf = ipv6_defaults.autoconf;
5091 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 5092
5093 net->ipv6.devconf_all = all;
5094 net->ipv6.devconf_dflt = dflt;
5095
5096#ifdef CONFIG_SYSCTL
f8572d8f 5097 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 5098 if (err < 0)
5099 goto err_reg_all;
5100
f8572d8f 5101 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 5102 if (err < 0)
5103 goto err_reg_dflt;
5104#endif
5105 return 0;
5106
5107#ifdef CONFIG_SYSCTL
5108err_reg_dflt:
5109 __addrconf_sysctl_unregister(all);
5110err_reg_all:
5111 kfree(dflt);
5112#endif
5113err_alloc_dflt:
5114 kfree(all);
5115err_alloc_all:
5116 return err;
5117}
5118
2c8c1e72 5119static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 5120{
5121#ifdef CONFIG_SYSCTL
5122 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5123 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5124#endif
09ad9bc7 5125 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 5126 kfree(net->ipv6.devconf_dflt);
5127 kfree(net->ipv6.devconf_all);
5128 }
5129}
5130
5131static struct pernet_operations addrconf_ops = {
5132 .init = addrconf_init_net,
5133 .exit = addrconf_exit_net,
5134};
5135
b382b191
TG		 5136static struct rtnl_af_ops inet6_ops = {
5137 .family = AF_INET6,
5138 .fill_link_af = inet6_fill_link_af,
5139 .get_link_af_size = inet6_get_link_af_size,
f53adae4 5140 .set_link_af = inet6_set_link_af,
b382b191
TG		 5141};
5142
1da177e4
LT		 5143/*
5144 * Init / cleanup code
5145 */
5146
5147int __init addrconf_init(void)
5148{
c2e21293 5149 int i, err;
2a8cc6c8 5150
e21e8467
SH		 5151 err = ipv6_addr_label_init();
5152 if (err < 0) {
f3213831
JP		 5153 pr_crit("%s: cannot initialize default policy table: %d\n",
5154 __func__, err);
2cc6d2bf 5155 goto out;
2a8cc6c8 5156 }
1da177e4 5157
2cc6d2bf
NH		 5158 err = register_pernet_subsys(&addrconf_ops);
5159 if (err < 0)
5160 goto out_addrlabel;
e0da5a48 5161
1da177e4
LT		 5162 /* The addrconf netdev notifier requires that loopback_dev
5163 * has it's ipv6 private information allocated and setup
5164 * before it can bring up and give link-local addresses
5165 * to other devices which are up.
5166 *
5167 * Unfortunately, loopback_dev is not necessarily the first
5168 * entry in the global dev_base list of net devices. In fact,
5169 * it is likely to be the very last entry on that list.
5170 * So this causes the notifier registry below to try and
5171 * give link-local addresses to all devices besides loopback_dev
5172 * first, then loopback_dev, which cases all the non-loopback_dev
5173 * devices to fail to get a link-local address.
5174 *
5175 * So, as a temporary fix, allocate the ipv6 structure for
5176 * loopback_dev first by hand.
5177 * Longer term, all of the dependencies ipv6 has upon the loopback
5178 * device and it being up should be removed.
5179 */
5180 rtnl_lock();
2774c7ab 5181 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 5182 err = -ENOMEM;
5183 rtnl_unlock();
5184 if (err)
e0da5a48 5185 goto errlo;
1da177e4 5186
c2e21293 5187 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5188 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5189
1da177e4
LT		 5190 register_netdevice_notifier(&ipv6_dev_notf);
5191
1da177e4 5192 addrconf_verify(0);
c127ea2c 5193
b382b191
TG		 5194 err = rtnl_af_register(&inet6_ops);
5195 if (err < 0)
5196 goto errout_af;
5197
c7ac8679
GR		 5198 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5199 NULL);
c127ea2c
TG		 5200 if (err < 0)
5201 goto errout;
5202
5203 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 5204 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5205 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5206 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5207 inet6_dump_ifaddr, NULL);
5208 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5209 inet6_dump_ifmcaddr, NULL);
5210 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5211 inet6_dump_ifacaddr, NULL);
76f8f6cb 5212 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 5213 inet6_netconf_dump_devconf, NULL);
c127ea2c 5214
2a8cc6c8
YH		 5215 ipv6_addr_label_rtnl_register();
5216
1da177e4 5217 return 0;
c127ea2c 5218errout:
b382b191
TG		 5219 rtnl_af_unregister(&inet6_ops);
5220errout_af:
c127ea2c 5221 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 5222errlo:
5223 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 5224out_addrlabel:
5225 ipv6_addr_label_cleanup();
5226out:
c127ea2c 5227 return err;
1da177e4
LT		 5228}
5229
09f7709f 5230void addrconf_cleanup(void)
1da177e4 5231{
176c39af 5232 struct net_device *dev;
1da177e4
LT		 5233 int i;
5234
5235 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5236 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 5237 ipv6_addr_label_cleanup();
1da177e4
LT		 5238
5239 rtnl_lock();
5240
b382b191
TG		 5241 __rtnl_af_unregister(&inet6_ops);
5242
176c39af
DL		 5243 /* clean dev list */
5244 for_each_netdev(&init_net, dev) {
5245 if (__in6_dev_get(dev) == NULL)
5246 continue;
5247 addrconf_ifdown(dev, 1);
5248 }
5249 addrconf_ifdown(init_net.loopback_dev, 2);
5250
1da177e4
LT		 5251 /*
5252 * Check hash table.
5253 */
5c578aed 5254 spin_lock_bh(&addrconf_hash_lock);
c2e21293 5255 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5256 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 5257 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 5258
5259 del_timer(&addr_chk_timer);
1da177e4 5260 rtnl_unlock();
1da177e4 5261}
Linux kernel - Deliverables
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