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netconf: rename PROXY_ARP to NEIGH_PROXY
[mirror_ubuntu-bionic-kernel.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 86#include <linux/random.h>
e21e8467 87#include <linux/uaccess.h>
7f7d9a6b 88#include <asm/unaligned.h>
1da177e4
LT		 89
90#include <linux/proc_fs.h>
91#include <linux/seq_file.h>
bc3b2d7f 92#include <linux/export.h>
1da177e4
LT		 93
94/* Set to 3 to get tracing... */
95#define ACONF_DEBUG 2
96
97#if ACONF_DEBUG >= 3
ba3542e1 98#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
1da177e4 99#else
ba3542e1 100#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
1da177e4
LT		 101#endif
102
103#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e
TG		 104
105static inline u32 cstamp_delta(unsigned long cstamp)
106{
107 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
108}
1da177e4
LT		 109
110#ifdef CONFIG_SYSCTL
f52295a9 111static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 112static void addrconf_sysctl_unregister(struct inet6_dev *idev);
113#else
114static inline void addrconf_sysctl_register(struct inet6_dev *idev)
115{
116}
117
118static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
119{
120}
1da177e4
LT		 121#endif
122
eb7e0575
SD		 123static void __ipv6_regen_rndid(struct inet6_dev *idev);
124static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 125static void ipv6_regen_rndid(unsigned long data);
1da177e4 126
1b34be74 127static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 128static int ipv6_count_addresses(struct inet6_dev *idev);
129
130/*
131 * Configured unicast address hash table
132 */
c2e21293 133static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 134static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 135
1da177e4
LT		 136static void addrconf_verify(unsigned long);
137
8d06afab 138static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 139static DEFINE_SPINLOCK(addrconf_verify_lock);
140
141static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
142static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
143
93d9b7d7
JP		 144static void addrconf_type_change(struct net_device *dev,
145 unsigned long event);
1da177e4
LT		 146static int addrconf_ifdown(struct net_device *dev, int how);
147
21caa662
RK		 148static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
149 int plen,
150 const struct net_device *dev,
151 u32 flags, u32 noflags);
152
cf22f9a2 153static void addrconf_dad_start(struct inet6_ifaddr *ifp);
1da177e4
LT		 154static void addrconf_dad_timer(unsigned long data);
155static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 156static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 157static void addrconf_rs_timer(unsigned long data);
158static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
159static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
160
1ab1457c 161static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 162 struct prefix_info *pinfo);
3e81c6da
DM		 163static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
164 struct net_device *dev);
1da177e4 165
888c848e 166static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 167 .forwarding = 0,
168 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
169 .mtu6 = IPV6_MIN_MTU,
170 .accept_ra = 1,
171 .accept_redirects = 1,
172 .autoconf = 1,
173 .force_mld_version = 0,
fc4eba58
HFS		 174 .mldv1_unsolicited_report_interval = 10 * HZ,
175 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 176 .dad_transmits = 1,
177 .rtr_solicits = MAX_RTR_SOLICITATIONS,
178 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
179 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 180 .use_tempaddr = 0,
181 .temp_valid_lft = TEMP_VALID_LIFETIME,
182 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
183 .regen_max_retry = REGEN_MAX_RETRY,
184 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 185 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 186 .accept_ra_defrtr = 1,
c4fd30eb 187 .accept_ra_pinfo = 1,
930d6ff2
YH		 188#ifdef CONFIG_IPV6_ROUTER_PREF
189 .accept_ra_rtr_pref = 1,
52e16356 190 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 191#ifdef CONFIG_IPV6_ROUTE_INFO
192 .accept_ra_rt_info_max_plen = 0,
193#endif
930d6ff2 194#endif
fbea49e1 195 .proxy_ndp = 0,
0bcbc926 196 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 197 .disable_ipv6 = 0,
1b34be74 198 .accept_dad = 1,
b800c3b9 199 .suppress_frag_ndisc = 1,
1da177e4
LT		 200};
201
ab32ea5d 202static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 203 .forwarding = 0,
204 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
205 .mtu6 = IPV6_MIN_MTU,
206 .accept_ra = 1,
207 .accept_redirects = 1,
208 .autoconf = 1,
fc4eba58
HFS		 209 .force_mld_version = 0,
210 .mldv1_unsolicited_report_interval = 10 * HZ,
211 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 212 .dad_transmits = 1,
213 .rtr_solicits = MAX_RTR_SOLICITATIONS,
214 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
215 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 216 .use_tempaddr = 0,
217 .temp_valid_lft = TEMP_VALID_LIFETIME,
218 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
219 .regen_max_retry = REGEN_MAX_RETRY,
220 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 221 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 222 .accept_ra_defrtr = 1,
c4fd30eb 223 .accept_ra_pinfo = 1,
930d6ff2
YH		 224#ifdef CONFIG_IPV6_ROUTER_PREF
225 .accept_ra_rtr_pref = 1,
52e16356 226 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 227#ifdef CONFIG_IPV6_ROUTE_INFO
228 .accept_ra_rt_info_max_plen = 0,
229#endif
930d6ff2 230#endif
fbea49e1 231 .proxy_ndp = 0,
0bcbc926 232 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 233 .disable_ipv6 = 0,
1b34be74 234 .accept_dad = 1,
b800c3b9 235 .suppress_frag_ndisc = 1,
1da177e4
LT		 236};
237
f24e3d65 238/* Check if a valid qdisc is available */
05297949 239static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 240{
05297949 241 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 242}
243
b7b1bfce 244static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 245{
b7b1bfce
HFS		 246 if (del_timer(&idev->rs_timer))
247 __in6_dev_put(idev);
248}
249
250static void addrconf_del_dad_timer(struct inet6_ifaddr *ifp)
251{
252 if (del_timer(&ifp->dad_timer))
1da177e4
LT		 253 __in6_ifa_put(ifp);
254}
255
b7b1bfce
HFS		 256static void addrconf_mod_rs_timer(struct inet6_dev *idev,
257 unsigned long when)
258{
259 if (!timer_pending(&idev->rs_timer))
260 in6_dev_hold(idev);
261 mod_timer(&idev->rs_timer, jiffies + when);
262}
1da177e4 263
b7b1bfce
HFS		 264static void addrconf_mod_dad_timer(struct inet6_ifaddr *ifp,
265 unsigned long when)
1da177e4 266{
b7b1bfce 267 if (!timer_pending(&ifp->dad_timer))
1da177e4 268 in6_ifa_hold(ifp);
b7b1bfce 269 mod_timer(&ifp->dad_timer, jiffies + when);
1da177e4
LT		 270}
271
7f7d9a6b
HX		 272static int snmp6_alloc_dev(struct inet6_dev *idev)
273{
827da44c
JS		 274 int i;
275
7d720c3e 276 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
1823e4c8
ED		 277 sizeof(struct ipstats_mib),
278 __alignof__(struct ipstats_mib)) < 0)
7f7d9a6b 279 goto err_ip;
827da44c
JS		 280
281 for_each_possible_cpu(i) {
282 struct ipstats_mib *addrconf_stats;
283 addrconf_stats = per_cpu_ptr(idev->stats.ipv6[0], i);
284 u64_stats_init(&addrconf_stats->syncp);
285#if SNMP_ARRAY_SZ == 2
286 addrconf_stats = per_cpu_ptr(idev->stats.ipv6[1], i);
287 u64_stats_init(&addrconf_stats->syncp);
288#endif
289 }
290
291
be281e55
ED		 292 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
293 GFP_KERNEL);
294 if (!idev->stats.icmpv6dev)
7f7d9a6b 295 goto err_icmp;
be281e55
ED		 296 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
297 GFP_KERNEL);
298 if (!idev->stats.icmpv6msgdev)
14878f75 299 goto err_icmpmsg;
7f7d9a6b
HX		 300
301 return 0;
302
14878f75 303err_icmpmsg:
be281e55 304 kfree(idev->stats.icmpv6dev);
7f7d9a6b 305err_icmp:
7d720c3e 306 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b 307err_ip:
aaf70ec7 308 return -ENOMEM;
7f7d9a6b
HX		 309}
310
8e5e8f30 311static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 312{
313 struct inet6_dev *ndev;
314
315 ASSERT_RTNL();
316
317 if (dev->mtu < IPV6_MIN_MTU)
318 return NULL;
319
1ab1457c 320 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 321
1ab1457c
YH		 322 if (ndev == NULL)
323 return NULL;
322f74a4
IO		 324
325 rwlock_init(&ndev->lock);
326 ndev->dev = dev;
502a2ffd 327 INIT_LIST_HEAD(&ndev->addr_list);
b7b1bfce
HFS		 328 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
329 (unsigned long)ndev);
c346dca1 330 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 331 ndev->cnf.mtu6 = dev->mtu;
332 ndev->cnf.sysctl = NULL;
333 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
334 if (ndev->nd_parms == NULL) {
335 kfree(ndev);
336 return NULL;
337 }
0187bdfb
BH		 338 if (ndev->cnf.forwarding)
339 dev_disable_lro(dev);
322f74a4
IO		 340 /* We refer to the device */
341 dev_hold(dev);
1da177e4 342
322f74a4 343 if (snmp6_alloc_dev(ndev) < 0) {
ba3542e1 344 ADBG(KERN_WARNING
f3213831 345 "%s: cannot allocate memory for statistics; dev=%s.\n",
ba3542e1 346 __func__, dev->name);
322f74a4 347 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 348 dev_put(dev);
349 kfree(ndev);
322f74a4
IO		 350 return NULL;
351 }
1da177e4 352
322f74a4 353 if (snmp6_register_dev(ndev) < 0) {
ba3542e1 354 ADBG(KERN_WARNING
f3213831 355 "%s: cannot create /proc/net/dev_snmp6/%s\n",
ba3542e1 356 __func__, dev->name);
322f74a4
IO		 357 neigh_parms_release(&nd_tbl, ndev->nd_parms);
358 ndev->dead = 1;
359 in6_dev_finish_destroy(ndev);
360 return NULL;
361 }
362
363 /* One reference from device. We must do this before
364 * we invoke __ipv6_regen_rndid().
365 */
366 in6_dev_hold(ndev);
1da177e4 367
1b34be74
YH		 368 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
369 ndev->cnf.accept_dad = -1;
370
07a93626 371#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 372 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 373 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 374 ndev->cnf.rtr_solicits = 0;
375 }
376#endif
377
372e6c8f 378 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 379 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 380 if ((dev->flags&IFF_LOOPBACK) ||
381 dev->type == ARPHRD_TUNNEL ||
9625ed72 382 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 383 dev->type == ARPHRD_SIT ||
0be669bb 384 dev->type == ARPHRD_NONE) {
322f74a4
IO		 385 ndev->cnf.use_tempaddr = -1;
386 } else {
387 in6_dev_hold(ndev);
388 ipv6_regen_rndid((unsigned long) ndev);
389 }
5d9efa7e 390
914faa14 391 ndev->token = in6addr_any;
1da177e4 392
f24e3d65 393 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 394 ndev->if_flags |= IF_READY;
395
322f74a4
IO		 396 ipv6_mc_init_dev(ndev);
397 ndev->tstamp = jiffies;
f52295a9 398 addrconf_sysctl_register(ndev);
30c4cf57 399 /* protected by rtnl_lock */
cf778b00 400 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 401
2c5e8933
HFS		 402 /* Join interface-local all-node multicast group */
403 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
404
d88ae4cc 405 /* Join all-node multicast group */
f3ee4010 406 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 407
d6ddef9e 408 /* Join all-router multicast group if forwarding is set */
8b2aaede 409 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 410 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
411
1da177e4
LT		 412 return ndev;
413}
414
8e5e8f30 415static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 416{
417 struct inet6_dev *idev;
418
419 ASSERT_RTNL();
420
e21e8467
SH		 421 idev = __in6_dev_get(dev);
422 if (!idev) {
423 idev = ipv6_add_dev(dev);
424 if (!idev)
1da177e4
LT		 425 return NULL;
426 }
c5e33bdd 427
1da177e4
LT		 428 if (dev->flags&IFF_UP)
429 ipv6_mc_up(idev);
430 return idev;
431}
432
f3a1bfb1
ND		 433static int inet6_netconf_msgsize_devconf(int type)
434{
435 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
436 + nla_total_size(4); /* NETCONFA_IFINDEX */
437
76f8f6cb
ND		 438 /* type -1 is used for ALL */
439 if (type == -1 || type == NETCONFA_FORWARDING)
f3a1bfb1 440 size += nla_total_size(4);
b1afce95 441#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 442 if (type == -1 || type == NETCONFA_MC_FORWARDING)
443 size += nla_total_size(4);
b1afce95 444#endif
f3a1bfb1
ND		 445
446 return size;
447}
448
449static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
450 struct ipv6_devconf *devconf, u32 portid,
451 u32 seq, int event, unsigned int flags,
452 int type)
453{
454 struct nlmsghdr *nlh;
455 struct netconfmsg *ncm;
456
457 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
458 flags);
459 if (nlh == NULL)
460 return -EMSGSIZE;
461
462 ncm = nlmsg_data(nlh);
463 ncm->ncm_family = AF_INET6;
464
465 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
466 goto nla_put_failure;
467
76f8f6cb
ND		 468 /* type -1 is used for ALL */
469 if ((type == -1 || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 470 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
471 goto nla_put_failure;
b1afce95 472#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 473 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
474 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
475 devconf->mc_forwarding) < 0)
476 goto nla_put_failure;
b1afce95 477#endif
f3a1bfb1
ND		 478 return nlmsg_end(skb, nlh);
479
480nla_put_failure:
481 nlmsg_cancel(skb, nlh);
482 return -EMSGSIZE;
483}
484
d67b8c61
ND		 485void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
486 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 487{
488 struct sk_buff *skb;
489 int err = -ENOBUFS;
490
491 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
492 if (skb == NULL)
493 goto errout;
494
495 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
496 RTM_NEWNETCONF, 0, type);
497 if (err < 0) {
498 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
499 WARN_ON(err == -EMSGSIZE);
500 kfree_skb(skb);
501 goto errout;
502 }
503 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
504 return;
505errout:
bd779028 506 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 507}
508
76f8f6cb
ND		 509static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
510 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
511 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
512};
513
514static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 515 struct nlmsghdr *nlh)
76f8f6cb
ND		 516{
517 struct net *net = sock_net(in_skb->sk);
518 struct nlattr *tb[NETCONFA_MAX+1];
519 struct netconfmsg *ncm;
520 struct sk_buff *skb;
521 struct ipv6_devconf *devconf;
522 struct inet6_dev *in6_dev;
523 struct net_device *dev;
524 int ifindex;
525 int err;
526
527 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
528 devconf_ipv6_policy);
529 if (err < 0)
530 goto errout;
531
532 err = EINVAL;
533 if (!tb[NETCONFA_IFINDEX])
534 goto errout;
535
536 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
537 switch (ifindex) {
538 case NETCONFA_IFINDEX_ALL:
539 devconf = net->ipv6.devconf_all;
540 break;
541 case NETCONFA_IFINDEX_DEFAULT:
542 devconf = net->ipv6.devconf_dflt;
543 break;
544 default:
545 dev = __dev_get_by_index(net, ifindex);
546 if (dev == NULL)
547 goto errout;
548 in6_dev = __in6_dev_get(dev);
549 if (in6_dev == NULL)
550 goto errout;
551 devconf = &in6_dev->cnf;
552 break;
553 }
554
555 err = -ENOBUFS;
556 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
557 if (skb == NULL)
558 goto errout;
559
560 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
561 NETLINK_CB(in_skb).portid,
562 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
563 -1);
564 if (err < 0) {
565 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
566 WARN_ON(err == -EMSGSIZE);
567 kfree_skb(skb);
568 goto errout;
569 }
570 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
571errout:
572 return err;
573}
574
7a674200
ND		 575static int inet6_netconf_dump_devconf(struct sk_buff *skb,
576 struct netlink_callback *cb)
577{
578 struct net *net = sock_net(skb->sk);
579 int h, s_h;
580 int idx, s_idx;
581 struct net_device *dev;
582 struct inet6_dev *idev;
583 struct hlist_head *head;
584
585 s_h = cb->args[0];
586 s_idx = idx = cb->args[1];
587
588 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
589 idx = 0;
590 head = &net->dev_index_head[h];
591 rcu_read_lock();
63998ac2
ND		 592 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
593 net->dev_base_seq;
7a674200
ND		 594 hlist_for_each_entry_rcu(dev, head, index_hlist) {
595 if (idx < s_idx)
596 goto cont;
597 idev = __in6_dev_get(dev);
598 if (!idev)
599 goto cont;
600
601 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
602 &idev->cnf,
603 NETLINK_CB(cb->skb).portid,
604 cb->nlh->nlmsg_seq,
605 RTM_NEWNETCONF,
606 NLM_F_MULTI,
607 -1) <= 0) {
608 rcu_read_unlock();
609 goto done;
610 }
63998ac2 611 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 612cont:
613 idx++;
614 }
615 rcu_read_unlock();
616 }
617 if (h == NETDEV_HASHENTRIES) {
618 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
619 net->ipv6.devconf_all,
620 NETLINK_CB(cb->skb).portid,
621 cb->nlh->nlmsg_seq,
622 RTM_NEWNETCONF, NLM_F_MULTI,
623 -1) <= 0)
624 goto done;
625 else
626 h++;
627 }
628 if (h == NETDEV_HASHENTRIES + 1) {
629 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
630 net->ipv6.devconf_dflt,
631 NETLINK_CB(cb->skb).portid,
632 cb->nlh->nlmsg_seq,
633 RTM_NEWNETCONF, NLM_F_MULTI,
634 -1) <= 0)
635 goto done;
636 else
637 h++;
638 }
639done:
640 cb->args[0] = h;
641 cb->args[1] = idx;
642
643 return skb->len;
644}
645
1da177e4
LT		 646#ifdef CONFIG_SYSCTL
647static void dev_forward_change(struct inet6_dev *idev)
648{
649 struct net_device *dev;
650 struct inet6_ifaddr *ifa;
1da177e4
LT		 651
652 if (!idev)
653 return;
654 dev = idev->dev;
0187bdfb
BH		 655 if (idev->cnf.forwarding)
656 dev_disable_lro(dev);
1a940835 657 if (dev->flags & IFF_MULTICAST) {
2c5e8933 658 if (idev->cnf.forwarding) {
f3ee4010 659 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 660 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
661 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
662 } else {
f3ee4010 663 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 664 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
665 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
666 }
1da177e4 667 }
502a2ffd 668
669 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 670 if (ifa->flags&IFA_F_TENTATIVE)
671 continue;
1da177e4
LT		 672 if (idev->cnf.forwarding)
673 addrconf_join_anycast(ifa);
674 else
675 addrconf_leave_anycast(ifa);
676 }
f3a1bfb1
ND		 677 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
678 dev->ifindex, &idev->cnf);
1da177e4
LT		 679}
680
681
e186932b 682static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 683{
684 struct net_device *dev;
685 struct inet6_dev *idev;
686
4acd4945 687 for_each_netdev(net, dev) {
1da177e4
LT		 688 idev = __in6_dev_get(dev);
689 if (idev) {
e186932b
PE		 690 int changed = (!idev->cnf.forwarding) ^ (!newf);
691 idev->cnf.forwarding = newf;
1da177e4
LT		 692 if (changed)
693 dev_forward_change(idev);
694 }
1da177e4 695 }
1da177e4 696}
c8fecf22 697
013d97e9 698static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 699{
bff16c2f 700 struct net *net;
013d97e9
FR		 701 int old;
702
703 if (!rtnl_trylock())
704 return restart_syscall();
bff16c2f
PE		 705
706 net = (struct net *)table->extra2;
013d97e9
FR		 707 old = *p;
708 *p = newf;
b325fddb 709
013d97e9 710 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 711 if ((!newf) ^ (!old))
712 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
713 NETCONFA_IFINDEX_DEFAULT,
714 net->ipv6.devconf_dflt);
013d97e9
FR		 715 rtnl_unlock();
716 return 0;
88af182e 717 }
c8fecf22 718
e186932b 719 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 720 net->ipv6.devconf_dflt->forwarding = newf;
721 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 722 if ((!newf) ^ (!old))
723 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
724 NETCONFA_IFINDEX_ALL,
725 net->ipv6.devconf_all);
013d97e9 726 } else if ((!newf) ^ (!old))
c8fecf22 727 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 728 rtnl_unlock();
c8fecf22 729
013d97e9 730 if (newf)
7b4da532 731 rt6_purge_dflt_routers(net);
b325fddb 732 return 1;
c8fecf22 733}
1da177e4
LT		 734#endif
735
5c578aed 736/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 737void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
738{
c2e21293 739 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 740
1da177e4 741#ifdef NET_REFCNT_DEBUG
91df42be 742 pr_debug("%s\n", __func__);
1da177e4
LT		 743#endif
744
745 in6_dev_put(ifp->idev);
746
b7b1bfce 747 if (del_timer(&ifp->dad_timer))
e21e8467 748 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
1da177e4 749
e9d3e084 750 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 751 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 752 return;
753 }
94e187c0 754 ip6_rt_put(ifp->rt);
1da177e4 755
e5785985 756 kfree_rcu(ifp, rcu);
1da177e4
LT		 757}
758
e55ffac6
BH		 759static void
760ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
761{
502a2ffd 762 struct list_head *p;
8a6ce0c0 763 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 764
765 /*
766 * Each device address list is sorted in order of scope -
767 * global before linklocal.
768 */
502a2ffd 769 list_for_each(p, &idev->addr_list) {
770 struct inet6_ifaddr *ifa
771 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 772 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 773 break;
774 }
775
b54c9b98 776 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 777}
778
ddbe5032 779static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 780{
ddbe5032 781 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 782}
783
1da177e4
LT		 784/* On success it returns ifp with increased reference count */
785
786static struct inet6_ifaddr *
3f8f5298
JP		 787ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
788 const struct in6_addr *peer_addr, int pfxlen,
8a226b2c 789 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
1da177e4
LT		 790{
791 struct inet6_ifaddr *ifa = NULL;
792 struct rt6_info *rt;
3a88a81d 793 unsigned int hash;
1da177e4 794 int err = 0;
d68b8270
YH		 795 int addr_type = ipv6_addr_type(addr);
796
797 if (addr_type == IPV6_ADDR_ANY ||
798 addr_type & IPV6_ADDR_MULTICAST ||
799 (!(idev->dev->flags & IFF_LOOPBACK) &&
800 addr_type & IPV6_ADDR_LOOPBACK))
801 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 802
8814c4b5 803 rcu_read_lock_bh();
1da177e4
LT		 804 if (idev->dead) {
805 err = -ENODEV; /*XXX*/
806 goto out2;
807 }
808
56d417b1 809 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 810 err = -EACCES;
811 goto out2;
812 }
813
5c578aed 814 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 815
816 /* Ignore adding duplicate addresses on an interface */
c346dca1 817 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ba3542e1 818 ADBG("ipv6_add_addr: already assigned\n");
1da177e4
LT		 819 err = -EEXIST;
820 goto out;
821 }
822
322f74a4 823 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 824
825 if (ifa == NULL) {
ba3542e1 826 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 827 err = -ENOBUFS;
828 goto out;
829 }
830
8f031519 831 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 832 if (IS_ERR(rt)) {
833 err = PTR_ERR(rt);
834 goto out;
835 }
836
bba24896
JP		 837 neigh_parms_data_state_setall(idev->nd_parms);
838
4e3fd7a0 839 ifa->addr = *addr;
3f8f5298
JP		 840 if (peer_addr)
841 ifa->peer_addr = *peer_addr;
1da177e4
LT		 842
843 spin_lock_init(&ifa->lock);
e9d3e084 844 spin_lock_init(&ifa->state_lock);
b7b1bfce
HFS		 845 setup_timer(&ifa->dad_timer, addrconf_dad_timer,
846 (unsigned long)ifa);
c2e21293 847 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 848 ifa->scope = scope;
849 ifa->prefix_len = pfxlen;
850 ifa->flags = flags | IFA_F_TENTATIVE;
8a226b2c
JB		 851 ifa->valid_lft = valid_lft;
852 ifa->prefered_lft = prefered_lft;
1da177e4 853 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 854 ifa->tokenized = false;
1da177e4 855
57f5f544
KF		 856 ifa->rt = rt;
857
1da177e4
LT		 858 ifa->idev = idev;
859 in6_dev_hold(idev);
860 /* For caller */
861 in6_ifa_hold(ifa);
862
863 /* Add to big hash table */
ddbe5032 864 hash = inet6_addr_hash(addr);
1da177e4 865
5c578aed 866 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 867 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 868
869 write_lock(&idev->lock);
870 /* Add to inet6_dev unicast addr list. */
e55ffac6 871 ipv6_link_dev_addr(idev, ifa);
1da177e4 872
1da177e4 873 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 874 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 875 in6_ifa_hold(ifa);
876 }
1da177e4 877
1da177e4
LT		 878 in6_ifa_hold(ifa);
879 write_unlock(&idev->lock);
880out2:
8814c4b5 881 rcu_read_unlock_bh();
1da177e4 882
fd92833a 883 if (likely(err == 0))
f88c91dd 884 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 885 else {
886 kfree(ifa);
887 ifa = ERR_PTR(err);
888 }
889
890 return ifa;
891out:
5c578aed 892 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 893 goto out2;
894}
895
896/* This function wants to get referenced ifp and releases it before return */
897
898static void ipv6_del_addr(struct inet6_ifaddr *ifp)
899{
502a2ffd 900 struct inet6_ifaddr *ifa, *ifn;
1da177e4 901 struct inet6_dev *idev = ifp->idev;
4c5ff6a6 902 int state;
1da177e4
LT		 903 int deleted = 0, onlink = 0;
904 unsigned long expires = jiffies;
905
4c5ff6a6
HX		 906 spin_lock_bh(&ifp->state_lock);
907 state = ifp->state;
e9d3e084 908 ifp->state = INET6_IFADDR_STATE_DEAD;
4c5ff6a6
HX		 909 spin_unlock_bh(&ifp->state_lock);
910
911 if (state == INET6_IFADDR_STATE_DEAD)
912 goto out;
1da177e4 913
5c578aed 914 spin_lock_bh(&addrconf_hash_lock);
915 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 916 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 917
918 write_lock_bh(&idev->lock);
5d9efa7e 919
1da177e4 920 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 921 list_del(&ifp->tmp_list);
922 if (ifp->ifpub) {
923 in6_ifa_put(ifp->ifpub);
924 ifp->ifpub = NULL;
1da177e4 925 }
372e6c8f 926 __in6_ifa_put(ifp);
1da177e4 927 }
1da177e4 928
502a2ffd 929 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
1da177e4 930 if (ifa == ifp) {
502a2ffd 931 list_del_init(&ifp->if_list);
1da177e4 932 __in6_ifa_put(ifp);
502a2ffd 933
1da177e4
LT		 934 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
935 break;
936 deleted = 1;
1d142804 937 continue;
1da177e4
LT		 938 } else if (ifp->flags & IFA_F_PERMANENT) {
939 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
940 ifp->prefix_len)) {
941 if (ifa->flags & IFA_F_PERMANENT) {
942 onlink = 1;
943 if (deleted)
944 break;
945 } else {
946 unsigned long lifetime;
947
948 if (!onlink)
949 onlink = -1;
950
951 spin_lock(&ifa->lock);
4bed72e4
YH		 952
953 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
954 /*
955 * Note: Because this address is
956 * not permanent, lifetime <
957 * LONG_MAX / HZ here.
958 */
1da177e4
LT		 959 if (time_before(expires,
960 ifa->tstamp + lifetime * HZ))
961 expires = ifa->tstamp + lifetime * HZ;
962 spin_unlock(&ifa->lock);
963 }
964 }
965 }
966 }
967 write_unlock_bh(&idev->lock);
968
b7b1bfce 969 addrconf_del_dad_timer(ifp);
b2238566 970
1da177e4
LT		 971 ipv6_ifa_notify(RTM_DELADDR, ifp);
972
f88c91dd 973 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 974
1da177e4
LT		 975 /*
976 * Purge or update corresponding prefix
977 *
978 * 1) we don't purge prefix here if address was not permanent.
979 * prefix is managed by its own lifetime.
980 * 2) if there're no addresses, delete prefix.
981 * 3) if there're still other permanent address(es),
982 * corresponding prefix is still permanent.
983 * 4) otherwise, update prefix lifetime to the
984 * longest valid lifetime among the corresponding
985 * addresses on the device.
986 * Note: subsequent RA will update lifetime.
987 *
988 * --yoshfuji
989 */
990 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
991 struct in6_addr prefix;
992 struct rt6_info *rt;
64c6d08e 993
1da177e4 994 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
1da177e4 995
21caa662
RK		 996 rt = addrconf_get_prefix_route(&prefix,
997 ifp->prefix_len,
998 ifp->idev->dev,
999 0, RTF_GATEWAY | RTF_DEFAULT);
1000
1001 if (rt) {
1da177e4 1002 if (onlink == 0) {
e0a1ad73 1003 ip6_del_rt(rt);
1da177e4
LT		 1004 rt = NULL;
1005 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1716a961 1006 rt6_set_expires(rt, expires);
1da177e4
LT		 1007 }
1008 }
94e187c0 1009 ip6_rt_put(rt);
1da177e4
LT		 1010 }
1011
c3968a85
DW		 1012 /* clean up prefsrc entries */
1013 rt6_remove_prefsrc(ifp);
4c5ff6a6 1014out:
1da177e4
LT		 1015 in6_ifa_put(ifp);
1016}
1017
1da177e4
LT		 1018static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1019{
1020 struct inet6_dev *idev = ifp->idev;
1021 struct in6_addr addr, *tmpaddr;
76f793e3 1022 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1023 unsigned long regen_advance;
1da177e4
LT		 1024 int tmp_plen;
1025 int ret = 0;
95c385b4 1026 u32 addr_flags;
76f793e3 1027 unsigned long now = jiffies;
1da177e4 1028
53bd6749 1029 write_lock_bh(&idev->lock);
1da177e4
LT		 1030 if (ift) {
1031 spin_lock_bh(&ift->lock);
1032 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1033 spin_unlock_bh(&ift->lock);
1034 tmpaddr = &addr;
1035 } else {
1036 tmpaddr = NULL;
1037 }
1038retry:
1039 in6_dev_hold(idev);
1040 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1041 write_unlock_bh(&idev->lock);
f3213831 1042 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1043 in6_dev_put(idev);
1044 ret = -1;
1045 goto out;
1046 }
1047 spin_lock_bh(&ifp->lock);
1048 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1049 idev->cnf.use_tempaddr = -1; /*XXX*/
1050 spin_unlock_bh(&ifp->lock);
53bd6749 1051 write_unlock_bh(&idev->lock);
f3213831
JP		 1052 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1053 __func__);
1da177e4
LT		 1054 in6_dev_put(idev);
1055 ret = -1;
1056 goto out;
1057 }
1058 in6_ifa_hold(ifp);
1059 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 1060 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1061 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1062 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 1063 tmp_valid_lft = min_t(__u32,
1064 ifp->valid_lft,
7a876b0e 1065 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 1066 tmp_prefered_lft = min_t(__u32,
1067 ifp->prefered_lft,
7a876b0e 1068 idev->cnf.temp_prefered_lft + age -
784e2710 1069 idev->cnf.max_desync_factor);
1da177e4 1070 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1071 tmp_tstamp = ifp->tstamp;
1072 spin_unlock_bh(&ifp->lock);
1073
eac55bf9 1074 regen_advance = idev->cnf.regen_max_retry *
7eaa48a4 1075 idev->cnf.dad_transmits *
1f9248e5 1076 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
53bd6749 1077 write_unlock_bh(&idev->lock);
95c385b4 1078
eac55bf9
BB		 1079 /* A temporary address is created only if this calculated Preferred
1080 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1081 * an implementation must not create a temporary address with a zero
1082 * Preferred Lifetime.
1083 */
1084 if (tmp_prefered_lft <= regen_advance) {
1085 in6_ifa_put(ifp);
1086 in6_dev_put(idev);
1087 ret = -1;
1088 goto out;
1089 }
1090
95c385b4
NH		 1091 addr_flags = IFA_F_TEMPORARY;
1092 /* set in addrconf_prefix_rcv() */
1093 if (ifp->flags & IFA_F_OPTIMISTIC)
1094 addr_flags |= IFA_F_OPTIMISTIC;
1095
4b08a8f1
HFS		 1096 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1097 ipv6_addr_scope(&addr), addr_flags,
1098 tmp_valid_lft, tmp_prefered_lft);
1099 if (IS_ERR(ift)) {
1da177e4
LT		 1100 in6_ifa_put(ifp);
1101 in6_dev_put(idev);
f3213831 1102 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1103 tmpaddr = &addr;
53bd6749 1104 write_lock_bh(&idev->lock);
1da177e4
LT		 1105 goto retry;
1106 }
1107
1108 spin_lock_bh(&ift->lock);
1109 ift->ifpub = ifp;
76f793e3 1110 ift->cstamp = now;
1da177e4
LT		 1111 ift->tstamp = tmp_tstamp;
1112 spin_unlock_bh(&ift->lock);
1113
cf22f9a2 1114 addrconf_dad_start(ift);
1da177e4
LT		 1115 in6_ifa_put(ift);
1116 in6_dev_put(idev);
1117out:
1118 return ret;
1119}
1da177e4
LT		 1120
1121/*
072047e4 1122 * Choose an appropriate source address (RFC3484)
1da177e4 1123 */
a9b05723
YH		 1124enum {
1125 IPV6_SADDR_RULE_INIT = 0,
1126 IPV6_SADDR_RULE_LOCAL,
1127 IPV6_SADDR_RULE_SCOPE,
1128 IPV6_SADDR_RULE_PREFERRED,
1129#ifdef CONFIG_IPV6_MIP6
1130 IPV6_SADDR_RULE_HOA,
1131#endif
1132 IPV6_SADDR_RULE_OIF,
1133 IPV6_SADDR_RULE_LABEL,
a9b05723 1134 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1135 IPV6_SADDR_RULE_ORCHID,
1136 IPV6_SADDR_RULE_PREFIX,
1137 IPV6_SADDR_RULE_MAX
1138};
1139
072047e4 1140struct ipv6_saddr_score {
a9b05723
YH		 1141 int rule;
1142 int addr_type;
1143 struct inet6_ifaddr *ifa;
1144 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1145 int scopedist;
1146 int matchlen;
072047e4
YH		 1147};
1148
a9b05723 1149struct ipv6_saddr_dst {
9acd9f3a 1150 const struct in6_addr *addr;
a9b05723
YH		 1151 int ifindex;
1152 int scope;
1153 int label;
7cbca67c 1154 unsigned int prefs;
a9b05723 1155};
072047e4 1156
b6f99a21 1157static inline int ipv6_saddr_preferred(int type)
1da177e4 1158{
45bb0060 1159 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1160 return 1;
1161 return 0;
1da177e4
LT		 1162}
1163
3de23255
BT		 1164static int ipv6_get_saddr_eval(struct net *net,
1165 struct ipv6_saddr_score *score,
a9b05723
YH		 1166 struct ipv6_saddr_dst *dst,
1167 int i)
1168{
1169 int ret;
1170
1171 if (i <= score->rule) {
1172 switch (i) {
1173 case IPV6_SADDR_RULE_SCOPE:
1174 ret = score->scopedist;
1175 break;
1176 case IPV6_SADDR_RULE_PREFIX:
1177 ret = score->matchlen;
1178 break;
1179 default:
1180 ret = !!test_bit(i, score->scorebits);
1181 }
1182 goto out;
1183 }
1184
1185 switch (i) {
1186 case IPV6_SADDR_RULE_INIT:
1187 /* Rule 0: remember if hiscore is not ready yet */
1188 ret = !!score->ifa;
1189 break;
1190 case IPV6_SADDR_RULE_LOCAL:
1191 /* Rule 1: Prefer same address */
1192 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1193 break;
1194 case IPV6_SADDR_RULE_SCOPE:
1195 /* Rule 2: Prefer appropriate scope
1196 *
1197 * ret
1198 * ^
1199 * -1 | d 15
1200 * ---+--+-+---> scope
1201 * |
1202 * | d is scope of the destination.
1203 * B-d | \
1204 * | \ <- smaller scope is better if
1205 * B-15 | \ if scope is enough for destinaion.
1206 * | ret = B - scope (-1 <= scope >= d <= 15).
1207 * d-C-1 | /
1208 * |/ <- greater is better
1209 * -C / if scope is not enough for destination.
1210 * /| ret = scope - C (-1 <= d < scope <= 15).
1211 *
1212 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1213 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1214 * Assume B = 0 and we get C > 29.
1215 */
1216 ret = __ipv6_addr_src_scope(score->addr_type);
1217 if (ret >= dst->scope)
1218 ret = -ret;
1219 else
1220 ret -= 128; /* 30 is enough */
1221 score->scopedist = ret;
1222 break;
1223 case IPV6_SADDR_RULE_PREFERRED:
1224 /* Rule 3: Avoid deprecated and optimistic addresses */
1225 ret = ipv6_saddr_preferred(score->addr_type) ||
1226 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1227 break;
1228#ifdef CONFIG_IPV6_MIP6
1229 case IPV6_SADDR_RULE_HOA:
7cbca67c 1230 {
a9b05723 1231 /* Rule 4: Prefer home address */
7cbca67c
YH		 1232 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1233 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1234 break;
7cbca67c 1235 }
a9b05723
YH		 1236#endif
1237 case IPV6_SADDR_RULE_OIF:
1238 /* Rule 5: Prefer outgoing interface */
1239 ret = (!dst->ifindex ||
1240 dst->ifindex == score->ifa->idev->dev->ifindex);
1241 break;
1242 case IPV6_SADDR_RULE_LABEL:
1243 /* Rule 6: Prefer matching label */
3de23255
BT		 1244 ret = ipv6_addr_label(net,
1245 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1246 score->ifa->idev->dev->ifindex) == dst->label;
1247 break;
a9b05723 1248 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1249 {
a9b05723 1250 /* Rule 7: Prefer public address
25985edc 1251 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1252 */
7cbca67c
YH		 1253 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1254 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1255 score->ifa->idev->cnf.use_tempaddr >= 2;
1256 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1257 break;
7cbca67c 1258 }
a9b05723
YH		 1259 case IPV6_SADDR_RULE_ORCHID:
1260 /* Rule 8-: Prefer ORCHID vs ORCHID or
1261 * non-ORCHID vs non-ORCHID
1262 */
1263 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1264 ipv6_addr_orchid(dst->addr));
1265 break;
1266 case IPV6_SADDR_RULE_PREFIX:
1267 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1268 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1269 if (ret > score->ifa->prefix_len)
1270 ret = score->ifa->prefix_len;
1271 score->matchlen = ret;
a9b05723
YH		 1272 break;
1273 default:
1274 ret = 0;
1275 }
1276
1277 if (ret)
1278 __set_bit(i, score->scorebits);
1279 score->rule = i;
1280out:
1281 return ret;
1282}
1283
b3f644fc 1284int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1285 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1286 struct in6_addr *saddr)
1da177e4 1287{
a9b05723
YH		 1288 struct ipv6_saddr_score scores[2],
1289 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1290 struct ipv6_saddr_dst dst;
072047e4 1291 struct net_device *dev;
a9b05723 1292 int dst_type;
1da177e4 1293
a9b05723
YH		 1294 dst_type = __ipv6_addr_type(daddr);
1295 dst.addr = daddr;
1296 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1297 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1298 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1299 dst.prefs = prefs;
a9b05723
YH		 1300
1301 hiscore->rule = -1;
1302 hiscore->ifa = NULL;
1da177e4 1303
8814c4b5 1304 rcu_read_lock();
1da177e4 1305
c6d14c84 1306 for_each_netdev_rcu(net, dev) {
072047e4 1307 struct inet6_dev *idev;
072047e4 1308
a9b05723 1309 /* Candidate Source Address (section 4)
072047e4
YH		 1310 * - multicast and link-local destination address,
1311 * the set of candidate source address MUST only
1312 * include addresses assigned to interfaces
1313 * belonging to the same link as the outgoing
1314 * interface.
1315 * (- For site-local destination addresses, the
1316 * set of candidate source addresses MUST only
1317 * include addresses assigned to interfaces
1318 * belonging to the same site as the outgoing
1319 * interface.)
1320 */
a9b05723
YH		 1321 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1322 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1323 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1324 continue;
1da177e4 1325
1da177e4 1326 idev = __in6_dev_get(dev);
072047e4
YH		 1327 if (!idev)
1328 continue;
1329
1330 read_lock_bh(&idev->lock);
502a2ffd 1331 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1332 int i;
072047e4 1333
a9b05723 1334 /*
6b3ae80a
YH		 1335 * - Tentative Address (RFC2462 section 5.4)
1336 * - A tentative address is not considered
1337 * "assigned to an interface" in the traditional
95c385b4 1338 * sense, unless it is also flagged as optimistic.
6b3ae80a 1339 * - Candidate Source Address (section 4)
072047e4
YH		 1340 * - In any case, anycast addresses, multicast
1341 * addresses, and the unspecified address MUST
1342 * NOT be included in a candidate set.
1343 */
a9b05723
YH		 1344 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1345 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1346 continue;
a9b05723
YH		 1347
1348 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1349
1350 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1351 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1352 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1353 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1354 "assigned as unicast address on %s",
1355 dev->name);
1356 continue;
1357 }
1358
a9b05723
YH		 1359 score->rule = -1;
1360 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1361
1362 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1363 int minihiscore, miniscore;
1364
3de23255
BT		 1365 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1366 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1367
1368 if (minihiscore > miniscore) {
1369 if (i == IPV6_SADDR_RULE_SCOPE &&
1370 score->scopedist > 0) {
1371 /*
1372 * special case:
1373 * each remaining entry
1374 * has too small (not enough)
1375 * scope, because ifa entries
1376 * are sorted by their scope
1377 * values.
1378 */
1379 goto try_nextdev;
1380 }
1381 break;
1382 } else if (minihiscore < miniscore) {
a9b05723
YH		 1383 if (hiscore->ifa)
1384 in6_ifa_put(hiscore->ifa);
1385
1386 in6_ifa_hold(score->ifa);
1387
a0bffffc 1388 swap(hiscore, score);
a9b05723
YH		 1389
1390 /* restore our iterator */
1391 score->ifa = hiscore->ifa;
1392
1393 break;
1da177e4 1394 }
072047e4 1395 }
1da177e4 1396 }
a9b05723 1397try_nextdev:
072047e4 1398 read_unlock_bh(&idev->lock);
1da177e4 1399 }
8814c4b5 1400 rcu_read_unlock();
1da177e4 1401
a9b05723 1402 if (!hiscore->ifa)
072047e4 1403 return -EADDRNOTAVAIL;
1ab1457c 1404
4e3fd7a0 1405 *saddr = hiscore->ifa->addr;
a9b05723 1406 in6_ifa_put(hiscore->ifa);
072047e4 1407 return 0;
1da177e4 1408}
5e5f3f0f 1409EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1410
8965779d 1411int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1412 u32 banned_flags)
b7b1bfce
HFS		 1413{
1414 struct inet6_ifaddr *ifp;
1415 int err = -EADDRNOTAVAIL;
1416
1417 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1418 if (ifp->scope == IFA_LINK &&
1419 !(ifp->flags & banned_flags)) {
1420 *addr = ifp->addr;
1421 err = 0;
1422 break;
1423 }
1424 }
1425 return err;
1426}
1427
95c385b4 1428int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1429 u32 banned_flags)
1da177e4
LT		 1430{
1431 struct inet6_dev *idev;
1432 int err = -EADDRNOTAVAIL;
1433
8814c4b5 1434 rcu_read_lock();
e21e8467
SH		 1435 idev = __in6_dev_get(dev);
1436 if (idev) {
1da177e4 1437 read_lock_bh(&idev->lock);
b7b1bfce 1438 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1439 read_unlock_bh(&idev->lock);
1440 }
8814c4b5 1441 rcu_read_unlock();
1da177e4
LT		 1442 return err;
1443}
1444
1445static int ipv6_count_addresses(struct inet6_dev *idev)
1446{
1447 int cnt = 0;
1448 struct inet6_ifaddr *ifp;
1449
1450 read_lock_bh(&idev->lock);
502a2ffd 1451 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1452 cnt++;
1453 read_unlock_bh(&idev->lock);
1454 return cnt;
1455}
1456
b71d1d42 1457int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1458 const struct net_device *dev, int strict)
1da177e4 1459{
eedf042a 1460 struct inet6_ifaddr *ifp;
ddbe5032 1461 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1462
5c578aed 1463 rcu_read_lock_bh();
b67bfe0d 1464 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1465 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1466 continue;
1da177e4 1467 if (ipv6_addr_equal(&ifp->addr, addr) &&
eedf042a
SH		 1468 !(ifp->flags&IFA_F_TENTATIVE) &&
1469 (dev == NULL || ifp->idev->dev == dev ||
1470 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1471 rcu_read_unlock_bh();
1472 return 1;
1da177e4
LT		 1473 }
1474 }
5c578aed 1475
eedf042a
SH		 1476 rcu_read_unlock_bh();
1477 return 0;
1da177e4 1478}
7159039a
YH		 1479EXPORT_SYMBOL(ipv6_chk_addr);
1480
3e81c6da
DM		 1481static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1482 struct net_device *dev)
1da177e4 1483{
ddbe5032 1484 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1485 struct inet6_ifaddr *ifp;
1da177e4 1486
b67bfe0d 1487 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1488 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1489 continue;
1da177e4
LT		 1490 if (ipv6_addr_equal(&ifp->addr, addr)) {
1491 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1492 return true;
1da177e4
LT		 1493 }
1494 }
3e81c6da 1495 return false;
1da177e4
LT		 1496}
1497
7df37ff3
CB		 1498/* Compares an address/prefix_len with addresses on device @dev.
1499 * If one is found it returns true.
1500 */
1501bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1502 const unsigned int prefix_len, struct net_device *dev)
1503{
1504 struct inet6_dev *idev;
1505 struct inet6_ifaddr *ifa;
1506 bool ret = false;
1507
1508 rcu_read_lock();
1509 idev = __in6_dev_get(dev);
1510 if (idev) {
1511 read_lock_bh(&idev->lock);
1512 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1513 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1514 if (ret)
1515 break;
1516 }
1517 read_unlock_bh(&idev->lock);
1518 }
1519 rcu_read_unlock();
1520
1521 return ret;
1522}
1523EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1524
b71d1d42 1525int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1526{
1527 struct inet6_dev *idev;
1528 struct inet6_ifaddr *ifa;
1529 int onlink;
1530
1531 onlink = 0;
1532 rcu_read_lock();
1533 idev = __in6_dev_get(dev);
1534 if (idev) {
1535 read_lock_bh(&idev->lock);
502a2ffd 1536 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1537 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1538 ifa->prefix_len);
1539 if (onlink)
1540 break;
1541 }
1542 read_unlock_bh(&idev->lock);
1543 }
1544 rcu_read_unlock();
1545 return onlink;
1546}
52eeeb84
YH		 1547EXPORT_SYMBOL(ipv6_chk_prefix);
1548
9acd9f3a 1549struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1550 struct net_device *dev, int strict)
1da177e4 1551{
b79d1d54 1552 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1553 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1554
5c578aed 1555 rcu_read_lock_bh();
b67bfe0d 1556 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1557 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1558 continue;
1da177e4
LT		 1559 if (ipv6_addr_equal(&ifp->addr, addr)) {
1560 if (dev == NULL || ifp->idev->dev == dev ||
1561 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1562 result = ifp;
1da177e4
LT		 1563 in6_ifa_hold(ifp);
1564 break;
1565 }
1566 }
1567 }
5c578aed 1568 rcu_read_unlock_bh();
1da177e4 1569
b79d1d54 1570 return result;
1da177e4
LT		 1571}
1572
1da177e4
LT		 1573/* Gets referenced address, destroys ifaddr */
1574
cc411d0b 1575static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1576{
1da177e4
LT		 1577 if (ifp->flags&IFA_F_PERMANENT) {
1578 spin_lock_bh(&ifp->lock);
b7b1bfce 1579 addrconf_del_dad_timer(ifp);
1da177e4 1580 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1581 if (dad_failed)
1582 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1583 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1584 if (dad_failed)
1585 ipv6_ifa_notify(0, ifp);
1da177e4 1586 in6_ifa_put(ifp);
1da177e4
LT		 1587 } else if (ifp->flags&IFA_F_TEMPORARY) {
1588 struct inet6_ifaddr *ifpub;
1589 spin_lock_bh(&ifp->lock);
1590 ifpub = ifp->ifpub;
1591 if (ifpub) {
1592 in6_ifa_hold(ifpub);
1593 spin_unlock_bh(&ifp->lock);
1594 ipv6_create_tempaddr(ifpub, ifp);
1595 in6_ifa_put(ifpub);
1596 } else {
1597 spin_unlock_bh(&ifp->lock);
1598 }
1599 ipv6_del_addr(ifp);
1da177e4
LT		 1600 } else
1601 ipv6_del_addr(ifp);
1602}
1603
f2344a13
HX		 1604static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1605{
1606 int err = -ENOENT;
1607
1608 spin_lock(&ifp->state_lock);
1609 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1610 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1611 err = 0;
1612 }
1613 spin_unlock(&ifp->state_lock);
1614
1615 return err;
1616}
1617
3c21edbd
YH		 1618void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1619{
1b34be74 1620 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1621
853dc2e0
UB		 1622 if (addrconf_dad_end(ifp)) {
1623 in6_ifa_put(ifp);
f2344a13 1624 return;
853dc2e0 1625 }
f2344a13 1626
e87cc472
JP		 1627 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1628 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1629
1b34be74
YH		 1630 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1631 struct in6_addr addr;
1632
1633 addr.s6_addr32[0] = htonl(0xfe800000);
1634 addr.s6_addr32[1] = 0;
1635
1636 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1637 ipv6_addr_equal(&ifp->addr, &addr)) {
1638 /* DAD failed for link-local based on MAC address */
1639 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1640
f3213831 1641 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1642 ifp->idev->dev->name);
1b34be74
YH		 1643 }
1644 }
1645
cc411d0b 1646 addrconf_dad_stop(ifp, 1);
3c21edbd 1647}
1da177e4
LT		 1648
1649/* Join to solicited addr multicast group. */
1650
b71d1d42 1651void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1652{
1653 struct in6_addr maddr;
1654
1655 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1656 return;
1657
1658 addrconf_addr_solict_mult(addr, &maddr);
1659 ipv6_dev_mc_inc(dev, &maddr);
1660}
1661
b71d1d42 1662void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1663{
1664 struct in6_addr maddr;
1665
1666 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1667 return;
1668
1669 addrconf_addr_solict_mult(addr, &maddr);
1670 __ipv6_dev_mc_dec(idev, &maddr);
1671}
1672
20380731 1673static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1674{
1675 struct in6_addr addr;
2bda8a0c
BM		 1676 if (ifp->prefix_len == 127) /* RFC 6164 */
1677 return;
1da177e4
LT		 1678 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1679 if (ipv6_addr_any(&addr))
1680 return;
1681 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1682}
1683
20380731 1684static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1685{
1686 struct in6_addr addr;
32019e65
YH		 1687 if (ifp->prefix_len == 127) /* RFC 6164 */
1688 return;
1da177e4
LT		 1689 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1690 if (ipv6_addr_any(&addr))
1691 return;
1692 __ipv6_dev_ac_dec(ifp->idev, &addr);
1693}
1694
073a8e0e
YH		 1695static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1696{
1697 if (dev->addr_len != ETH_ALEN)
1698 return -1;
1699 memcpy(eui, dev->dev_addr, 3);
1700 memcpy(eui + 5, dev->dev_addr + 3, 3);
1701
1702 /*
1703 * The zSeries OSA network cards can be shared among various
1704 * OS instances, but the OSA cards have only one MAC address.
1705 * This leads to duplicate address conflicts in conjunction
1706 * with IPv6 if more than one instance uses the same card.
1707 *
1708 * The driver for these cards can deliver a unique 16-bit
1709 * identifier for each instance sharing the same card. It is
1710 * placed instead of 0xFFFE in the interface identifier. The
1711 * "u" bit of the interface identifier is not inverted in this
1712 * case. Hence the resulting interface identifier has local
1713 * scope according to RFC2373.
1714 */
1715 if (dev->dev_id) {
1716 eui[3] = (dev->dev_id >> 8) & 0xFF;
1717 eui[4] = dev->dev_id & 0xFF;
1718 } else {
1719 eui[3] = 0xFF;
1720 eui[4] = 0xFE;
1721 eui[0] ^= 2;
1722 }
1723 return 0;
1724}
1725
06a4c1c5 1726static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1727{
1728 if (dev->addr_len != IEEE802154_ADDR_LEN)
1729 return -1;
1730 memcpy(eui, dev->dev_addr, 8);
5e98a36e 1731 eui[0] ^= 2;
06a4c1c5 1732 return 0;
1733}
1734
cb6bf355
YH		 1735static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1736{
1737 union fwnet_hwaddr *ha;
1738
1739 if (dev->addr_len != FWNET_ALEN)
1740 return -1;
1741
1742 ha = (union fwnet_hwaddr *)dev->dev_addr;
1743
1744 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1745 eui[0] ^= 2;
1746 return 0;
1747}
1748
073a8e0e
YH		 1749static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1750{
1751 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1752 if (dev->addr_len != ARCNET_ALEN)
1753 return -1;
1754 memset(eui, 0, 7);
8e5e8f30 1755 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1756 return 0;
1757}
1758
1759static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1760{
1761 if (dev->addr_len != INFINIBAND_ALEN)
1762 return -1;
1763 memcpy(eui, dev->dev_addr + 12, 8);
1764 eui[0] |= 2;
1765 return 0;
1766}
1767
c61393ea 1768static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1769{
9af28511
SH		 1770 if (addr == 0)
1771 return -1;
dfd982ba
YH		 1772 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1773 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1774 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1775 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1776 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1777 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1778 eui[1] = 0;
1779 eui[2] = 0x5E;
1780 eui[3] = 0xFE;
1781 memcpy(eui + 4, &addr, 4);
1782 return 0;
1783}
dfd982ba
YH		 1784
1785static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1786{
1787 if (dev->priv_flags & IFF_ISATAP)
1788 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1789 return -1;
1790}
1791
aee80b54 1792static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1793{
1794 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1795}
1796
e837735e
ND		 1797static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1798{
1799 memcpy(eui, dev->perm_addr, 3);
1800 memcpy(eui + 5, dev->perm_addr + 3, 3);
1801 eui[3] = 0xFF;
1802 eui[4] = 0xFE;
1803 eui[0] ^= 2;
1804 return 0;
1805}
1806
1da177e4
LT		 1807static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1808{
1809 switch (dev->type) {
1810 case ARPHRD_ETHER:
1811 case ARPHRD_FDDI:
073a8e0e 1812 return addrconf_ifid_eui48(eui, dev);
1da177e4 1813 case ARPHRD_ARCNET:
073a8e0e 1814 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1815 case ARPHRD_INFINIBAND:
073a8e0e 1816 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1817 case ARPHRD_SIT:
dfd982ba 1818 return addrconf_ifid_sit(eui, dev);
aee80b54 1819 case ARPHRD_IPGRE:
1820 return addrconf_ifid_gre(eui, dev);
06a4c1c5 1821 case ARPHRD_IEEE802154:
1822 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 1823 case ARPHRD_IEEE1394:
1824 return addrconf_ifid_ieee1394(eui, dev);
e837735e
ND		 1825 case ARPHRD_TUNNEL6:
1826 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 1827 }
1828 return -1;
1829}
1830
1831static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1832{
1833 int err = -1;
1834 struct inet6_ifaddr *ifp;
1835
1836 read_lock_bh(&idev->lock);
502a2ffd 1837 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 1838 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1839 memcpy(eui, ifp->addr.s6_addr+8, 8);
1840 err = 0;
1841 break;
1842 }
1843 }
1844 read_unlock_bh(&idev->lock);
1845 return err;
1846}
1847
1da177e4 1848/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 1849static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 1850{
1da177e4 1851regen:
955189ef 1852 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1853 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1854
1855 /*
1856 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1857 * check if generated address is not inappropriate
1858 *
1859 * - Reserved subnet anycast (RFC 2526)
1860 * 11111101 11....11 1xxxxxxx
c7dc89c0 1861 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1862 * 00-00-5E-FE-xx-xx-xx-xx
1863 * - value 0
1864 * - XXX: already assigned to an address on the device
1865 */
1ab1457c 1866 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1867 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1868 (idev->rndid[7]&0x80))
1869 goto regen;
1870 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1871 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1872 goto regen;
1873 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1874 goto regen;
1875 }
1da177e4
LT		 1876}
1877
1878static void ipv6_regen_rndid(unsigned long data)
1879{
1880 struct inet6_dev *idev = (struct inet6_dev *) data;
1881 unsigned long expires;
1882
8814c4b5 1883 rcu_read_lock_bh();
1da177e4
LT		 1884 write_lock_bh(&idev->lock);
1885
1886 if (idev->dead)
1887 goto out;
1888
eb7e0575 1889 __ipv6_regen_rndid(idev);
1ab1457c 1890
1da177e4 1891 expires = jiffies +
1ab1457c 1892 idev->cnf.temp_prefered_lft * HZ -
1f9248e5
JP		 1893 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
1894 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
784e2710 1895 idev->cnf.max_desync_factor * HZ;
1da177e4 1896 if (time_before(expires, jiffies)) {
f3213831
JP		 1897 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1898 __func__, idev->dev->name);
1da177e4
LT		 1899 goto out;
1900 }
1901
1902 if (!mod_timer(&idev->regen_timer, expires))
1903 in6_dev_hold(idev);
1904
1905out:
1906 write_unlock_bh(&idev->lock);
8814c4b5 1907 rcu_read_unlock_bh();
1da177e4
LT		 1908 in6_dev_put(idev);
1909}
1910
eb7e0575 1911static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 1912{
1da177e4 1913 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 1914 __ipv6_regen_rndid(idev);
1da177e4 1915}
1da177e4
LT		 1916
1917/*
1918 * Add prefix route.
1919 */
1920
1921static void
1922addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1923 unsigned long expires, u32 flags)
1da177e4 1924{
86872cb5
TG		 1925 struct fib6_config cfg = {
1926 .fc_table = RT6_TABLE_PREFIX,
1927 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1928 .fc_ifindex = dev->ifindex,
1929 .fc_expires = expires,
1930 .fc_dst_len = plen,
1931 .fc_flags = RTF_UP | flags,
c346dca1 1932 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1933 .fc_protocol = RTPROT_KERNEL,
86872cb5 1934 };
1da177e4 1935
4e3fd7a0 1936 cfg.fc_dst = *pfx;
1da177e4
LT		 1937
1938 /* Prevent useless cloning on PtP SIT.
1939 This thing is done here expecting that the whole
1940 class of non-broadcast devices need not cloning.
1941 */
07a93626 1942#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 1943 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1944 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1945#endif
1da177e4 1946
86872cb5 1947 ip6_route_add(&cfg);
1da177e4
LT		 1948}
1949
14ef37b6
AH		 1950
1951static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1952 int plen,
1953 const struct net_device *dev,
1954 u32 flags, u32 noflags)
1955{
1956 struct fib6_node *fn;
1957 struct rt6_info *rt = NULL;
1958 struct fib6_table *table;
1959
1960 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1961 if (table == NULL)
1962 return NULL;
1963
5744dd9b 1964 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 1965 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1966 if (!fn)
1967 goto out;
1968 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 1969 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 1970 continue;
1971 if ((rt->rt6i_flags & flags) != flags)
1972 continue;
85da53bf 1973 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 1974 continue;
1975 dst_hold(&rt->dst);
1976 break;
1977 }
1978out:
5744dd9b 1979 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 1980 return rt;
1981}
1982
1983
1da177e4
LT		 1984/* Create "default" multicast route to the interface */
1985
1986static void addrconf_add_mroute(struct net_device *dev)
1987{
86872cb5
TG		 1988 struct fib6_config cfg = {
1989 .fc_table = RT6_TABLE_LOCAL,
1990 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1991 .fc_ifindex = dev->ifindex,
1992 .fc_dst_len = 8,
1993 .fc_flags = RTF_UP,
c346dca1 1994 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1995 };
1996
1997 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1998
1999 ip6_route_add(&cfg);
1da177e4
LT		 2000}
2001
1da177e4
LT		 2002static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2003{
2004 struct inet6_dev *idev;
2005
2006 ASSERT_RTNL();
2007
e21e8467
SH		 2008 idev = ipv6_find_idev(dev);
2009 if (!idev)
64e724f6
BH		 2010 return ERR_PTR(-ENOBUFS);
2011
2012 if (idev->cnf.disable_ipv6)
2013 return ERR_PTR(-EACCES);
1da177e4
LT		 2014
2015 /* Add default multicast route */
4af04aba
LW		 2016 if (!(dev->flags & IFF_LOOPBACK))
2017 addrconf_add_mroute(dev);
1da177e4 2018
1da177e4
LT		 2019 return idev;
2020}
2021
53bd6749
JP		 2022static void manage_tempaddrs(struct inet6_dev *idev,
2023 struct inet6_ifaddr *ifp,
2024 __u32 valid_lft, __u32 prefered_lft,
2025 bool create, unsigned long now)
2026{
2027 u32 flags;
2028 struct inet6_ifaddr *ift;
2029
2030 read_lock_bh(&idev->lock);
2031 /* update all temporary addresses in the list */
2032 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2033 int age, max_valid, max_prefered;
2034
2035 if (ifp != ift->ifpub)
2036 continue;
2037
2038 /* RFC 4941 section 3.3:
2039 * If a received option will extend the lifetime of a public
2040 * address, the lifetimes of temporary addresses should
2041 * be extended, subject to the overall constraint that no
2042 * temporary addresses should ever remain "valid" or "preferred"
2043 * for a time longer than (TEMP_VALID_LIFETIME) or
2044 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2045 */
2046 age = (now - ift->cstamp) / HZ;
2047 max_valid = idev->cnf.temp_valid_lft - age;
2048 if (max_valid < 0)
2049 max_valid = 0;
2050
2051 max_prefered = idev->cnf.temp_prefered_lft -
2052 idev->cnf.max_desync_factor - age;
2053 if (max_prefered < 0)
2054 max_prefered = 0;
2055
2056 if (valid_lft > max_valid)
2057 valid_lft = max_valid;
2058
2059 if (prefered_lft > max_prefered)
2060 prefered_lft = max_prefered;
2061
2062 spin_lock(&ift->lock);
2063 flags = ift->flags;
2064 ift->valid_lft = valid_lft;
2065 ift->prefered_lft = prefered_lft;
2066 ift->tstamp = now;
2067 if (prefered_lft > 0)
2068 ift->flags &= ~IFA_F_DEPRECATED;
2069
2070 spin_unlock(&ift->lock);
2071 if (!(flags&IFA_F_TENTATIVE))
2072 ipv6_ifa_notify(0, ift);
2073 }
2074
2075 if ((create || list_empty(&idev->tempaddr_list)) &&
2076 idev->cnf.use_tempaddr > 0) {
2077 /* When a new public address is created as described
2078 * in [ADDRCONF], also create a new temporary address.
2079 * Also create a temporary address if it's enabled but
2080 * no temporary address currently exists.
2081 */
2082 read_unlock_bh(&idev->lock);
2083 ipv6_create_tempaddr(ifp, NULL);
2084 } else {
2085 read_unlock_bh(&idev->lock);
2086 }
2087}
2088
e6bff995 2089void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2090{
2091 struct prefix_info *pinfo;
2092 __u32 valid_lft;
2093 __u32 prefered_lft;
2094 int addr_type;
1da177e4 2095 struct inet6_dev *in6_dev;
56d417b1 2096 struct net *net = dev_net(dev);
1da177e4
LT		 2097
2098 pinfo = (struct prefix_info *) opt;
1ab1457c 2099
1da177e4 2100 if (len < sizeof(struct prefix_info)) {
ba3542e1 2101 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2102 return;
2103 }
1ab1457c 2104
1da177e4
LT		 2105 /*
2106 * Validation checks ([ADDRCONF], page 19)
2107 */
2108
2109 addr_type = ipv6_addr_type(&pinfo->prefix);
2110
2111 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2112 return;
2113
2114 valid_lft = ntohl(pinfo->valid);
2115 prefered_lft = ntohl(pinfo->prefered);
2116
2117 if (prefered_lft > valid_lft) {
e87cc472 2118 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2119 return;
2120 }
2121
2122 in6_dev = in6_dev_get(dev);
2123
2124 if (in6_dev == NULL) {
e87cc472
JP		 2125 net_dbg_ratelimited("addrconf: device %s not configured\n",
2126 dev->name);
1da177e4
LT		 2127 return;
2128 }
2129
2130 /*
2131 * Two things going on here:
2132 * 1) Add routes for on-link prefixes
2133 * 2) Configure prefixes with the auto flag set
2134 */
2135
4bed72e4
YH		 2136 if (pinfo->onlink) {
2137 struct rt6_info *rt;
2138 unsigned long rt_expires;
2139
6f704992
YH		 2140 /* Avoid arithmetic overflow. Really, we could
2141 * save rt_expires in seconds, likely valid_lft,
2142 * but it would require division in fib gc, that it
2143 * not good.
2144 */
4bed72e4
YH		 2145 if (HZ > USER_HZ)
2146 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2147 else
2148 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2149
4bed72e4
YH		 2150 if (addrconf_finite_timeout(rt_expires))
2151 rt_expires *= HZ;
1da177e4 2152
14ef37b6
AH		 2153 rt = addrconf_get_prefix_route(&pinfo->prefix,
2154 pinfo->prefix_len,
2155 dev,
2156 RTF_ADDRCONF | RTF_PREFIX_RT,
2157 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2158
14ef37b6 2159 if (rt) {
6f704992
YH		 2160 /* Autoconf prefix route */
2161 if (valid_lft == 0) {
2162 ip6_del_rt(rt);
2163 rt = NULL;
4bed72e4 2164 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2165 /* not infinity */
1716a961 2166 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2167 } else {
1716a961 2168 rt6_clean_expires(rt);
1da177e4
LT		 2169 }
2170 } else if (valid_lft) {
6f704992 2171 clock_t expires = 0;
4bed72e4
YH		 2172 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2173 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2174 /* not infinity */
2175 flags |= RTF_EXPIRES;
2176 expires = jiffies_to_clock_t(rt_expires);
2177 }
1da177e4 2178 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2179 dev, expires, flags);
1da177e4 2180 }
94e187c0 2181 ip6_rt_put(rt);
1da177e4
LT		 2182 }
2183
2184 /* Try to figure out our local address for this prefix */
2185
2186 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2187 struct inet6_ifaddr *ifp;
1da177e4
LT		 2188 struct in6_addr addr;
2189 int create = 0, update_lft = 0;
617fe29d 2190 bool tokenized = false;
1da177e4
LT		 2191
2192 if (pinfo->prefix_len == 64) {
2193 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2194
2195 if (!ipv6_addr_any(&in6_dev->token)) {
2196 read_lock_bh(&in6_dev->lock);
2197 memcpy(addr.s6_addr + 8,
2198 in6_dev->token.s6_addr + 8, 8);
2199 read_unlock_bh(&in6_dev->lock);
617fe29d 2200 tokenized = true;
f53adae4
DB		 2201 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2202 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1da177e4
LT		 2203 in6_dev_put(in6_dev);
2204 return;
2205 }
2206 goto ok;
2207 }
e87cc472
JP		 2208 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2209 pinfo->prefix_len);
1da177e4
LT		 2210 in6_dev_put(in6_dev);
2211 return;
2212
2213ok:
2214
53b7997f 2215 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 2216
2217 if (ifp == NULL && valid_lft) {
2218 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2219 u32 addr_flags = 0;
2220
2221#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2222 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2223 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 2224 addr_flags = IFA_F_OPTIMISTIC;
2225#endif
1da177e4
LT		 2226
2227 /* Do not allow to create too much of autoconfigured
2228 * addresses; this would be too easy way to crash kernel.
2229 */
2230 if (!max_addresses ||
2231 ipv6_count_addresses(in6_dev) < max_addresses)
3f8f5298
JP		 2232 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2233 pinfo->prefix_len,
95c385b4 2234 addr_type&IPV6_ADDR_SCOPE_MASK,
8a226b2c
JB		 2235 addr_flags, valid_lft,
2236 prefered_lft);
1da177e4 2237
3f0d2ba0 2238 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2239 in6_dev_put(in6_dev);
2240 return;
2241 }
2242
53bd6749 2243 ifp->flags |= IFA_F_MANAGETEMPADDR;
8a226b2c
JB		 2244 update_lft = 0;
2245 create = 1;
1da177e4 2246 ifp->cstamp = jiffies;
617fe29d 2247 ifp->tokenized = tokenized;
cf22f9a2 2248 addrconf_dad_start(ifp);
1da177e4
LT		 2249 }
2250
2251 if (ifp) {
479840ff 2252 u32 flags;
1da177e4 2253 unsigned long now;
1da177e4
LT		 2254 u32 stored_lft;
2255
2256 /* update lifetime (RFC2462 5.5.3 e) */
2257 spin_lock(&ifp->lock);
2258 now = jiffies;
2259 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2260 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2261 else
2262 stored_lft = 0;
8a226b2c 2263 if (!update_lft && !create && stored_lft) {
c9d55d5b
PM		 2264 const u32 minimum_lft = min(
2265 stored_lft, (u32)MIN_VALID_LIFETIME);
2266 valid_lft = max(valid_lft, minimum_lft);
2267
2268 /* RFC4862 Section 5.5.3e:
2269 * "Note that the preferred lifetime of the
2270 * corresponding address is always reset to
2271 * the Preferred Lifetime in the received
2272 * Prefix Information option, regardless of
2273 * whether the valid lifetime is also reset or
2274 * ignored."
2275 *
2276 * So we should always update prefered_lft here.
2277 */
2278 update_lft = 1;
1da177e4
LT		 2279 }
2280
2281 if (update_lft) {
2282 ifp->valid_lft = valid_lft;
2283 ifp->prefered_lft = prefered_lft;
2284 ifp->tstamp = now;
2285 flags = ifp->flags;
2286 ifp->flags &= ~IFA_F_DEPRECATED;
2287 spin_unlock(&ifp->lock);
2288
2289 if (!(flags&IFA_F_TENTATIVE))
2290 ipv6_ifa_notify(0, ifp);
2291 } else
2292 spin_unlock(&ifp->lock);
2293
53bd6749
JP		 2294 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2295 create, now);
5d9efa7e 2296
1da177e4
LT		 2297 in6_ifa_put(ifp);
2298 addrconf_verify(0);
2299 }
2300 }
2301 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2302 in6_dev_put(in6_dev);
2303}
2304
2305/*
2306 * Set destination address.
2307 * Special case for SIT interfaces where we create a new "virtual"
2308 * device.
2309 */
af284937 2310int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2311{
2312 struct in6_ifreq ireq;
2313 struct net_device *dev;
2314 int err = -EINVAL;
2315
2316 rtnl_lock();
2317
2318 err = -EFAULT;
2319 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2320 goto err_exit;
2321
af284937 2322 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2323
2324 err = -ENODEV;
2325 if (dev == NULL)
2326 goto err_exit;
2327
07a93626 2328#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2329 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2330 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2331 struct ifreq ifr;
1da177e4
LT		 2332 struct ip_tunnel_parm p;
2333
2334 err = -EADDRNOTAVAIL;
2335 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2336 goto err_exit;
2337
2338 memset(&p, 0, sizeof(p));
2339 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2340 p.iph.saddr = 0;
2341 p.iph.version = 4;
2342 p.iph.ihl = 5;
2343 p.iph.protocol = IPPROTO_IPV6;
2344 p.iph.ttl = 64;
d20b3109 2345 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2346
5bc3eb7e
SH		 2347 if (ops->ndo_do_ioctl) {
2348 mm_segment_t oldfs = get_fs();
2349
2350 set_fs(KERNEL_DS);
2351 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2352 set_fs(oldfs);
2353 } else
2354 err = -EOPNOTSUPP;
1da177e4
LT		 2355
2356 if (err == 0) {
2357 err = -ENOBUFS;
af284937
DL		 2358 dev = __dev_get_by_name(net, p.name);
2359 if (!dev)
1da177e4
LT		 2360 goto err_exit;
2361 err = dev_open(dev);
2362 }
2363 }
0be669bb 2364#endif
1da177e4
LT		 2365
2366err_exit:
2367 rtnl_unlock();
2368 return err;
2369}
2370
2371/*
2372 * Manual configuration of address on an interface
2373 */
479840ff
JP		 2374static int inet6_addr_add(struct net *net, int ifindex,
2375 const struct in6_addr *pfx,
caeaba79 2376 const struct in6_addr *peer_pfx,
479840ff
JP		 2377 unsigned int plen, __u32 ifa_flags,
2378 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2379{
2380 struct inet6_ifaddr *ifp;
2381 struct inet6_dev *idev;
2382 struct net_device *dev;
2383 int scope;
6f704992
YH		 2384 u32 flags;
2385 clock_t expires;
4bed72e4 2386 unsigned long timeout;
1da177e4
LT		 2387
2388 ASSERT_RTNL();
1ab1457c 2389
24ef0da7
TG		 2390 if (plen > 128)
2391 return -EINVAL;
2392
0778769d
NT		 2393 /* check the lifetime */
2394 if (!valid_lft || prefered_lft > valid_lft)
2395 return -EINVAL;
2396
53bd6749
JP		 2397 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2398 return -EINVAL;
2399
af284937
DL		 2400 dev = __dev_get_by_index(net, ifindex);
2401 if (!dev)
1da177e4 2402 return -ENODEV;
1ab1457c 2403
64e724f6
BH		 2404 idev = addrconf_add_dev(dev);
2405 if (IS_ERR(idev))
2406 return PTR_ERR(idev);
1da177e4
LT		 2407
2408 scope = ipv6_addr_scope(pfx);
2409
4bed72e4
YH		 2410 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2411 if (addrconf_finite_timeout(timeout)) {
2412 expires = jiffies_to_clock_t(timeout * HZ);
2413 valid_lft = timeout;
6f704992 2414 flags = RTF_EXPIRES;
4bed72e4
YH		 2415 } else {
2416 expires = 0;
2417 flags = 0;
2418 ifa_flags |= IFA_F_PERMANENT;
6f704992 2419 }
0778769d 2420
4bed72e4
YH		 2421 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2422 if (addrconf_finite_timeout(timeout)) {
2423 if (timeout == 0)
2424 ifa_flags |= IFA_F_DEPRECATED;
2425 prefered_lft = timeout;
2426 }
0778769d 2427
8a226b2c
JB		 2428 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2429 valid_lft, prefered_lft);
0778769d 2430
1da177e4 2431 if (!IS_ERR(ifp)) {
46d48046 2432 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2433 expires, flags);
95c385b4
NH		 2434 /*
2435 * Note that section 3.1 of RFC 4429 indicates
2436 * that the Optimistic flag should not be set for
2437 * manually configured addresses
2438 */
cf22f9a2 2439 addrconf_dad_start(ifp);
53bd6749
JP		 2440 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2441 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2442 true, jiffies);
1da177e4 2443 in6_ifa_put(ifp);
0778769d 2444 addrconf_verify(0);
1da177e4
LT		 2445 return 0;
2446 }
2447
2448 return PTR_ERR(ifp);
2449}
2450
b71d1d42 2451static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2452 unsigned int plen)
1da177e4
LT		 2453{
2454 struct inet6_ifaddr *ifp;
2455 struct inet6_dev *idev;
2456 struct net_device *dev;
1ab1457c 2457
24ef0da7
TG		 2458 if (plen > 128)
2459 return -EINVAL;
2460
af284937
DL		 2461 dev = __dev_get_by_index(net, ifindex);
2462 if (!dev)
1da177e4
LT		 2463 return -ENODEV;
2464
7eaa48a4 2465 if ((idev = __in6_dev_get(dev)) == NULL)
1da177e4
LT		 2466 return -ENXIO;
2467
2468 read_lock_bh(&idev->lock);
502a2ffd 2469 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2470 if (ifp->prefix_len == plen &&
2471 ipv6_addr_equal(pfx, &ifp->addr)) {
2472 in6_ifa_hold(ifp);
2473 read_unlock_bh(&idev->lock);
1ab1457c 2474
1da177e4 2475 ipv6_del_addr(ifp);
1da177e4
LT		 2476 return 0;
2477 }
2478 }
2479 read_unlock_bh(&idev->lock);
2480 return -EADDRNOTAVAIL;
2481}
2482
2483
af284937 2484int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2485{
2486 struct in6_ifreq ireq;
2487 int err;
1ab1457c 2488
af31f412 2489 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2490 return -EPERM;
1ab1457c 2491
1da177e4
LT		 2492 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2493 return -EFAULT;
2494
2495 rtnl_lock();
caeaba79 2496 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2497 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2498 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2499 rtnl_unlock();
2500 return err;
2501}
2502
af284937 2503int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2504{
2505 struct in6_ifreq ireq;
2506 int err;
1ab1457c 2507
af31f412 2508 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2509 return -EPERM;
2510
2511 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2512 return -EFAULT;
2513
2514 rtnl_lock();
af284937
DL		 2515 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2516 ireq.ifr6_prefixlen);
1da177e4
LT		 2517 rtnl_unlock();
2518 return err;
2519}
2520
b5f348e5
IJ		 2521static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2522 int plen, int scope)
2523{
2524 struct inet6_ifaddr *ifp;
2525
8a226b2c
JB		 2526 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2527 scope, IFA_F_PERMANENT, 0, 0);
b5f348e5
IJ		 2528 if (!IS_ERR(ifp)) {
2529 spin_lock_bh(&ifp->lock);
2530 ifp->flags &= ~IFA_F_TENTATIVE;
2531 spin_unlock_bh(&ifp->lock);
2532 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2533 in6_ifa_put(ifp);
2534 }
2535}
2536
07a93626 2537#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2538static void sit_add_v4_addrs(struct inet6_dev *idev)
2539{
1da177e4
LT		 2540 struct in6_addr addr;
2541 struct net_device *dev;
c346dca1 2542 struct net *net = dev_net(idev->dev);
929c9cf3 2543 int scope, plen;
f0e2acfa 2544 u32 pflags = 0;
1da177e4
LT		 2545
2546 ASSERT_RTNL();
2547
2548 memset(&addr, 0, sizeof(struct in6_addr));
2549 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2550
2551 if (idev->dev->flags&IFF_POINTOPOINT) {
2552 addr.s6_addr32[0] = htonl(0xfe800000);
2553 scope = IFA_LINK;
929c9cf3 2554 plen = 64;
1da177e4
LT		 2555 } else {
2556 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2557 plen = 96;
f0e2acfa 2558 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2559 }
2560
2561 if (addr.s6_addr32[3]) {
929c9cf3 2562 add_addr(idev, &addr, plen, scope);
f0e2acfa 2563 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2564 return;
2565 }
2566
6fda7350 2567 for_each_netdev(net, dev) {
8e5e8f30 2568 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2569 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2570 struct in_ifaddr *ifa;
1da177e4
LT		 2571
2572 int flag = scope;
2573
2574 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2575
2576 addr.s6_addr32[3] = ifa->ifa_local;
2577
2578 if (ifa->ifa_scope == RT_SCOPE_LINK)
2579 continue;
2580 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2581 if (idev->dev->flags&IFF_POINTOPOINT)
2582 continue;
2583 flag |= IFA_HOST;
2584 }
1da177e4 2585
b5f348e5 2586 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2587 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2588 pflags);
1da177e4
LT		 2589 }
2590 }
1ab1457c 2591 }
1da177e4 2592}
0be669bb 2593#endif
1da177e4
LT		 2594
2595static void init_loopback(struct net_device *dev)
2596{
2597 struct inet6_dev *idev;
25fb6ca4
BK		 2598 struct net_device *sp_dev;
2599 struct inet6_ifaddr *sp_ifa;
2600 struct rt6_info *sp_rt;
1da177e4
LT		 2601
2602 /* ::1 */
2603
2604 ASSERT_RTNL();
2605
7eaa48a4 2606 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2607 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2608 return;
2609 }
2610
b5f348e5 2611 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2612
2613 /* Add routes to other interface's IPv6 addresses */
2614 for_each_netdev(dev_net(dev), sp_dev) {
2615 if (!strcmp(sp_dev->name, dev->name))
2616 continue;
2617
2618 idev = __in6_dev_get(sp_dev);
2619 if (!idev)
2620 continue;
2621
2622 read_lock_bh(&idev->lock);
2623 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2624
2625 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2626 continue;
2627
a881ae1f
G		 2628 if (sp_ifa->rt)
2629 continue;
2630
57ec0afe 2631 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 2632
2633 /* Failure cases are ignored */
534c8779
G		 2634 if (!IS_ERR(sp_rt)) {
2635 sp_ifa->rt = sp_rt;
25fb6ca4 2636 ip6_ins_rt(sp_rt);
534c8779 2637 }
25fb6ca4
BK		 2638 }
2639 read_unlock_bh(&idev->lock);
2640 }
1da177e4
LT		 2641}
2642
b71d1d42 2643static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4 2644{
8e5e8f30 2645 struct inet6_ifaddr *ifp;
95c385b4
NH		 2646 u32 addr_flags = IFA_F_PERMANENT;
2647
2648#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2649 if (idev->cnf.optimistic_dad &&
702beb87 2650 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2651 addr_flags |= IFA_F_OPTIMISTIC;
2652#endif
1da177e4 2653
95c385b4 2654
8a226b2c 2655 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 0, 0);
1da177e4 2656 if (!IS_ERR(ifp)) {
46d48046 2657 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2658 addrconf_dad_start(ifp);
1da177e4
LT		 2659 in6_ifa_put(ifp);
2660 }
2661}
2662
2663static void addrconf_dev_config(struct net_device *dev)
2664{
2665 struct in6_addr addr;
8e5e8f30 2666 struct inet6_dev *idev;
1da177e4
LT		 2667
2668 ASSERT_RTNL();
2669
74235a25
HX		 2670 if ((dev->type != ARPHRD_ETHER) &&
2671 (dev->type != ARPHRD_FDDI) &&
74235a25 2672 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 2673 (dev->type != ARPHRD_INFINIBAND) &&
cb6bf355 2674 (dev->type != ARPHRD_IEEE802154) &&
e837735e
ND		 2675 (dev->type != ARPHRD_IEEE1394) &&
2676 (dev->type != ARPHRD_TUNNEL6)) {
74235a25
HX		 2677 /* Alas, we support only Ethernet autoconfiguration. */
2678 return;
2679 }
2680
1da177e4 2681 idev = addrconf_add_dev(dev);
64e724f6 2682 if (IS_ERR(idev))
1da177e4
LT		 2683 return;
2684
2685 memset(&addr, 0, sizeof(struct in6_addr));
2686 addr.s6_addr32[0] = htonl(0xFE800000);
2687
2688 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2689 addrconf_add_linklocal(idev, &addr);
2690}
2691
07a93626 2692#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2693static void addrconf_sit_config(struct net_device *dev)
2694{
2695 struct inet6_dev *idev;
2696
2697 ASSERT_RTNL();
2698
1ab1457c
YH		 2699 /*
2700 * Configure the tunnel with one of our IPv4
2701 * addresses... we should configure all of
1da177e4
LT		 2702 * our v4 addrs in the tunnel
2703 */
2704
7eaa48a4 2705 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2706 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2707 return;
2708 }
2709
c7dc89c0
FT		 2710 if (dev->priv_flags & IFF_ISATAP) {
2711 struct in6_addr addr;
2712
2713 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
c7dc89c0
FT		 2714 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2715 addrconf_add_linklocal(idev, &addr);
2716 return;
2717 }
2718
1da177e4
LT		 2719 sit_add_v4_addrs(idev);
2720
62b54dd9 2721 if (dev->flags&IFF_POINTOPOINT)
1da177e4 2722 addrconf_add_mroute(dev);
1da177e4 2723}
0be669bb 2724#endif
1da177e4 2725
07a93626 2726#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2727static void addrconf_gre_config(struct net_device *dev)
2728{
2729 struct inet6_dev *idev;
2730 struct in6_addr addr;
2731
aee80b54 2732 ASSERT_RTNL();
2733
7eaa48a4 2734 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2735 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 2736 return;
2737 }
2738
2739 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
aee80b54 2740 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2741 addrconf_add_linklocal(idev, &addr);
2742}
2743#endif
2744
1da177e4
LT		 2745static inline int
2746ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2747{
2748 struct in6_addr lladdr;
2749
95c385b4 2750 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2751 addrconf_add_linklocal(idev, &lladdr);
2752 return 0;
2753 }
2754 return -1;
2755}
2756
1ab1457c 2757static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 2758 void *ptr)
1da177e4 2759{
351638e7 2760 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 2761 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2762 int run_pending = 0;
b217d616 2763 int err;
1da177e4 2764
e21e8467 2765 switch (event) {
45ba9dd2 2766 case NETDEV_REGISTER:
74235a25 2767 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2768 idev = ipv6_add_dev(dev);
2769 if (!idev)
b217d616 2770 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2771 }
2772 break;
bcdd553f 2773
1da177e4 2774 case NETDEV_UP:
3c21edbd 2775 case NETDEV_CHANGE:
c2edacf8
JV		 2776 if (dev->flags & IFF_SLAVE)
2777 break;
2778
3c21edbd 2779 if (event == NETDEV_UP) {
f24e3d65 2780 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 2781 /* device is not ready yet. */
f3213831 2782 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 2783 dev->name);
2784 break;
2785 }
99081049 2786
d31c7b8f
EP		 2787 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2788 idev = ipv6_add_dev(dev);
2789
e3ec6cfc 2790 if (idev) {
99081049 2791 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2792 run_pending = 1;
2793 }
3c21edbd 2794 } else {
f24e3d65 2795 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2796 /* device is still not ready. */
2797 break;
2798 }
2799
2800 if (idev) {
bcdd553f 2801 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2802 /* device is already configured. */
2803 break;
3c21edbd
YH		 2804 idev->if_flags |= IF_READY;
2805 }
2806
f3213831
JP		 2807 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2808 dev->name);
3c21edbd 2809
c5e33bdd 2810 run_pending = 1;
3c21edbd
YH		 2811 }
2812
e21e8467 2813 switch (dev->type) {
07a93626 2814#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2815 case ARPHRD_SIT:
2816 addrconf_sit_config(dev);
2817 break;
aee80b54 2818#endif
07a93626 2819#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2820 case ARPHRD_IPGRE:
2821 addrconf_gre_config(dev);
2822 break;
0be669bb 2823#endif
1da177e4
LT		 2824 case ARPHRD_LOOPBACK:
2825 init_loopback(dev);
2826 break;
2827
2828 default:
2829 addrconf_dev_config(dev);
2830 break;
3ff50b79 2831 }
bcdd553f 2832
1da177e4 2833 if (idev) {
c5e33bdd
YH		 2834 if (run_pending)
2835 addrconf_dad_run(idev);
2836
bcdd553f
SH		 2837 /*
2838 * If the MTU changed during the interface down,
2839 * when the interface up, the changed MTU must be
2840 * reflected in the idev as well as routers.
1da177e4 2841 */
bcdd553f
SH		 2842 if (idev->cnf.mtu6 != dev->mtu &&
2843 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2844 rt6_mtu_change(dev, dev->mtu);
2845 idev->cnf.mtu6 = dev->mtu;
2846 }
2847 idev->tstamp = jiffies;
2848 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2849
2850 /*
2851 * If the changed mtu during down is lower than
2852 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2853 */
2854 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2855 addrconf_ifdown(dev, 1);
1da177e4
LT		 2856 }
2857 break;
2858
2859 case NETDEV_CHANGEMTU:
d31c7b8f 2860 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2861 rt6_mtu_change(dev, dev->mtu);
2862 idev->cnf.mtu6 = dev->mtu;
2863 break;
2864 }
2865
d31c7b8f
EP		 2866 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2867 idev = ipv6_add_dev(dev);
2868 if (idev)
2869 break;
2870 }
2871
bcdd553f
SH		 2872 /*
2873 * MTU falled under IPV6_MIN_MTU.
2874 * Stop IPv6 on this interface.
2875 */
1da177e4
LT		 2876
2877 case NETDEV_DOWN:
2878 case NETDEV_UNREGISTER:
2879 /*
2880 * Remove all addresses from this interface.
2881 */
2882 addrconf_ifdown(dev, event != NETDEV_DOWN);
2883 break;
3c21edbd 2884
1da177e4 2885 case NETDEV_CHANGENAME:
1da177e4 2886 if (idev) {
5632c515 2887 snmp6_unregister_dev(idev);
408c4768 2888 addrconf_sysctl_unregister(idev);
f52295a9 2889 addrconf_sysctl_register(idev);
b217d616
HX		 2890 err = snmp6_register_dev(idev);
2891 if (err)
2892 return notifier_from_errno(err);
5632c515 2893 }
1da177e4 2894 break;
bcdd553f 2895
93d9b7d7
JP		 2896 case NETDEV_PRE_TYPE_CHANGE:
2897 case NETDEV_POST_TYPE_CHANGE:
2898 addrconf_type_change(dev, event);
75c78500 2899 break;
3ff50b79 2900 }
1da177e4
LT		 2901
2902 return NOTIFY_OK;
2903}
2904
2905/*
2906 * addrconf module should be notified of a device going up
2907 */
2908static struct notifier_block ipv6_dev_notf = {
2909 .notifier_call = addrconf_notify,
1da177e4
LT		 2910};
2911
93d9b7d7 2912static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2913{
2914 struct inet6_dev *idev;
2915 ASSERT_RTNL();
2916
2917 idev = __in6_dev_get(dev);
2918
93d9b7d7 2919 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2920 ipv6_mc_remap(idev);
93d9b7d7 2921 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2922 ipv6_mc_unmap(idev);
2923}
2924
1da177e4
LT		 2925static int addrconf_ifdown(struct net_device *dev, int how)
2926{
c346dca1 2927 struct net *net = dev_net(dev);
502a2ffd 2928 struct inet6_dev *idev;
2929 struct inet6_ifaddr *ifa;
73a8bd74 2930 int state, i;
1da177e4
LT		 2931
2932 ASSERT_RTNL();
2933
73a8bd74
DM		 2934 rt6_ifdown(net, dev);
2935 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 2936
2937 idev = __in6_dev_get(dev);
2938 if (idev == NULL)
2939 return -ENODEV;
2940
bcdd553f
SH		 2941 /*
2942 * Step 1: remove reference to ipv6 device from parent device.
2943 * Do not dev_put!
1da177e4 2944 */
439e2385 2945 if (how) {
1da177e4 2946 idev->dead = 1;
8814c4b5
YH		 2947
2948 /* protected by rtnl_lock */
a9b3cd7f 2949 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 2950
2951 /* Step 1.5: remove snmp6 entry */
2952 snmp6_unregister_dev(idev);
2953
2954 }
2955
73a8bd74
DM		 2956 /* Step 2: clear hash table */
2957 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2958 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 2959
2960 spin_lock_bh(&addrconf_hash_lock);
2961 restart:
b67bfe0d 2962 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74
DM		 2963 if (ifa->idev == idev) {
2964 hlist_del_init_rcu(&ifa->addr_lst);
b7b1bfce 2965 addrconf_del_dad_timer(ifa);
73a8bd74
DM		 2966 goto restart;
2967 }
2968 }
2969 spin_unlock_bh(&addrconf_hash_lock);
2970 }
2971
1da177e4
LT		 2972 write_lock_bh(&idev->lock);
2973
b7b1bfce
HFS		 2974 addrconf_del_rs_timer(idev);
2975
bcdd553f 2976 /* Step 2: clear flags for stateless addrconf */
439e2385 2977 if (!how)
3c21edbd 2978 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 2979
439e2385 2980 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2981 in6_dev_put(idev);
2982
bcdd553f 2983 /* Step 3: clear tempaddr list */
372e6c8f 2984 while (!list_empty(&idev->tempaddr_list)) {
2985 ifa = list_first_entry(&idev->tempaddr_list,
2986 struct inet6_ifaddr, tmp_list);
2987 list_del(&ifa->tmp_list);
1da177e4
LT		 2988 write_unlock_bh(&idev->lock);
2989 spin_lock_bh(&ifa->lock);
2990
2991 if (ifa->ifpub) {
2992 in6_ifa_put(ifa->ifpub);
2993 ifa->ifpub = NULL;
2994 }
2995 spin_unlock_bh(&ifa->lock);
2996 in6_ifa_put(ifa);
2997 write_lock_bh(&idev->lock);
2998 }
8f37ada5 2999
502a2ffd 3000 while (!list_empty(&idev->addr_list)) {
3001 ifa = list_first_entry(&idev->addr_list,
3002 struct inet6_ifaddr, if_list);
b7b1bfce 3003 addrconf_del_dad_timer(ifa);
84e8b803 3004
73a8bd74 3005 list_del(&ifa->if_list);
84e8b803 3006
73a8bd74 3007 write_unlock_bh(&idev->lock);
84e8b803 3008
73a8bd74
DM		 3009 spin_lock_bh(&ifa->state_lock);
3010 state = ifa->state;
3011 ifa->state = INET6_IFADDR_STATE_DEAD;
3012 spin_unlock_bh(&ifa->state_lock);
9d82ca98 3013
73a8bd74
DM		 3014 if (state != INET6_IFADDR_STATE_DEAD) {
3015 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3016 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 3017 }
73a8bd74 3018 in6_ifa_put(ifa);
8f37ada5 3019
73a8bd74
DM		 3020 write_lock_bh(&idev->lock);
3021 }
8f37ada5 3022
1da177e4
LT		 3023 write_unlock_bh(&idev->lock);
3024
3025 /* Step 5: Discard multicast list */
439e2385 3026 if (how)
1da177e4
LT		 3027 ipv6_mc_destroy_dev(idev);
3028 else
3029 ipv6_mc_down(idev);
3030
1da177e4 3031 idev->tstamp = jiffies;
1ab1457c 3032
bcdd553f 3033 /* Last: Shot the device (if unregistered) */
439e2385 3034 if (how) {
408c4768 3035 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3036 neigh_parms_release(&nd_tbl, idev->nd_parms);
3037 neigh_ifdown(&nd_tbl, dev);
3038 in6_dev_put(idev);
3039 }
3040 return 0;
3041}
3042
3043static void addrconf_rs_timer(unsigned long data)
3044{
b7b1bfce 3045 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3046 struct net_device *dev = idev->dev;
b7b1bfce 3047 struct in6_addr lladdr;
1da177e4 3048
b7b1bfce 3049 write_lock(&idev->lock);
5b2a1953 3050 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3051 goto out;
3052
9ba2add3 3053 if (!ipv6_accept_ra(idev))
5b2a1953 3054 goto out;
3055
3056 /* Announcement received after solicitation was sent */
3057 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3058 goto out;
1da177e4 3059
b7b1bfce 3060 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
caf92bc4
CW		 3061 write_unlock(&idev->lock);
3062 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3063 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3064 &in6addr_linklocal_allrouters);
3065 else
caf92bc4 3066 goto put;
1da177e4 3067
caf92bc4 3068 write_lock(&idev->lock);
b7b1bfce
HFS		 3069 /* The wait after the last probe can be shorter */
3070 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3071 idev->cnf.rtr_solicits) ?
3072 idev->cnf.rtr_solicit_delay :
3073 idev->cnf.rtr_solicit_interval);
1da177e4 3074 } else {
1da177e4
LT		 3075 /*
3076 * Note: we do not support deprecated "all on-link"
3077 * assumption any longer.
3078 */
91df42be 3079 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3080 }
3081
3082out:
b7b1bfce 3083 write_unlock(&idev->lock);
caf92bc4 3084put:
b7b1bfce 3085 in6_dev_put(idev);
1da177e4
LT		 3086}
3087
3088/*
3089 * Duplicate Address Detection
3090 */
3c21edbd
YH		 3091static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3092{
3093 unsigned long rand_num;
3094 struct inet6_dev *idev = ifp->idev;
3095
95c385b4
NH		 3096 if (ifp->flags & IFA_F_OPTIMISTIC)
3097 rand_num = 0;
3098 else
3099 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3100
b7b1bfce
HFS		 3101 ifp->dad_probes = idev->cnf.dad_transmits;
3102 addrconf_mod_dad_timer(ifp, rand_num);
3c21edbd
YH		 3103}
3104
cf22f9a2 3105static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4
LT		 3106{
3107 struct inet6_dev *idev = ifp->idev;
3108 struct net_device *dev = idev->dev;
1da177e4
LT		 3109
3110 addrconf_join_solict(dev, &ifp->addr);
3111
1da177e4 3112 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 3113
3114 read_lock_bh(&idev->lock);
622ccdf1 3115 spin_lock(&ifp->lock);
e9d3e084 3116 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3117 goto out;
1da177e4
LT		 3118
3119 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3120 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3121 !(ifp->flags&IFA_F_TENTATIVE) ||
3122 ifp->flags & IFA_F_NODAD) {
cc411d0b 3123 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3124 spin_unlock(&ifp->lock);
1da177e4
LT		 3125 read_unlock_bh(&idev->lock);
3126
3127 addrconf_dad_completed(ifp);
3128 return;
3129 }
3130
6732bade 3131 if (!(idev->if_flags & IF_READY)) {
21809faf 3132 spin_unlock(&ifp->lock);
6732bade 3133 read_unlock_bh(&idev->lock);
3c21edbd 3134 /*
590a9887 3135 * If the device is not ready:
3c21edbd
YH		 3136 * - keep it tentative if it is a permanent address.
3137 * - otherwise, kill it.
3138 */
3139 in6_ifa_hold(ifp);
cc411d0b 3140 addrconf_dad_stop(ifp, 0);
6732bade 3141 return;
3c21edbd 3142 }
95c385b4
NH		 3143
3144 /*
3145 * Optimistic nodes can start receiving
3146 * Frames right away
3147 */
e21e8467 3148 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 3149 ip6_ins_rt(ifp->rt);
3150
6732bade 3151 addrconf_dad_kick(ifp);
1da177e4 3152out:
622ccdf1 3153 spin_unlock(&ifp->lock);
1da177e4
LT		 3154 read_unlock_bh(&idev->lock);
3155}
3156
3157static void addrconf_dad_timer(unsigned long data)
3158{
3159 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3160 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3161 struct in6_addr mcaddr;
3162
b7b1bfce 3163 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3164 goto out;
3165
b7b1bfce 3166 write_lock(&idev->lock);
122e4519 3167 if (idev->dead || !(idev->if_flags & IF_READY)) {
b7b1bfce 3168 write_unlock(&idev->lock);
1da177e4
LT		 3169 goto out;
3170 }
21809faf 3171
3172 spin_lock(&ifp->lock);
622ccdf1
HX		 3173 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3174 spin_unlock(&ifp->lock);
b7b1bfce 3175 write_unlock(&idev->lock);
622ccdf1
HX		 3176 goto out;
3177 }
3178
b7b1bfce 3179 if (ifp->dad_probes == 0) {
1da177e4
LT		 3180 /*
3181 * DAD was successful
3182 */
3183
cc411d0b 3184 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3185 spin_unlock(&ifp->lock);
b7b1bfce 3186 write_unlock(&idev->lock);
1da177e4
LT		 3187
3188 addrconf_dad_completed(ifp);
3189
3190 goto out;
3191 }
3192
b7b1bfce 3193 ifp->dad_probes--;
1f9248e5
JP		 3194 addrconf_mod_dad_timer(ifp,
3195 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3196 spin_unlock(&ifp->lock);
b7b1bfce 3197 write_unlock(&idev->lock);
1da177e4
LT		 3198
3199 /* send a neighbour solicitation for our addr */
1da177e4 3200 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3201 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3202out:
3203 in6_ifa_put(ifp);
3204}
3205
3206static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3207{
e21e8467 3208 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3209 struct in6_addr lladdr;
b173ee48 3210 bool send_rs, send_mld;
b7b1bfce
HFS		 3211
3212 addrconf_del_dad_timer(ifp);
1da177e4
LT		 3213
3214 /*
3215 * Configure the address for reception. Now it is valid.
3216 */
3217
3218 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3219
026359bc
TA		 3220 /* If added prefix is link local and we are prepared to process
3221 router advertisements, start sending router solicitations.
1da177e4
LT		 3222 */
3223
1ec047eb
HFS		 3224 read_lock_bh(&ifp->idev->lock);
3225 spin_lock(&ifp->lock);
b173ee48
HFS		 3226 send_mld = ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL &&
3227 ifp->idev->valid_ll_addr_cnt == 1;
3228 send_rs = send_mld &&
3229 ipv6_accept_ra(ifp->idev) &&
1ec047eb 3230 ifp->idev->cnf.rtr_solicits > 0 &&
b173ee48 3231 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 3232 spin_unlock(&ifp->lock);
3233 read_unlock_bh(&ifp->idev->lock);
3234
b173ee48
HFS		 3235 /* While dad is in progress mld report's source address is in6_addrany.
3236 * Resend with proper ll now.
3237 */
3238 if (send_mld)
3239 ipv6_mc_dad_complete(ifp->idev);
3240
1ec047eb 3241 if (send_rs) {
1da177e4
LT		 3242 /*
3243 * If a host as already performed a random delay
3244 * [...] as part of DAD [...] there is no need
3245 * to delay again before sending the first RS
3246 */
1ec047eb 3247 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 3248 return;
1ec047eb 3249 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 3250
b7b1bfce
HFS		 3251 write_lock_bh(&ifp->idev->lock);
3252 spin_lock(&ifp->lock);
3253 ifp->idev->rs_probes = 1;
1da177e4 3254 ifp->idev->if_flags |= IF_RS_SENT;
b7b1bfce
HFS		 3255 addrconf_mod_rs_timer(ifp->idev,
3256 ifp->idev->cnf.rtr_solicit_interval);
3257 spin_unlock(&ifp->lock);
3258 write_unlock_bh(&ifp->idev->lock);
1da177e4
LT		 3259 }
3260}
3261
e21e8467
SH		 3262static void addrconf_dad_run(struct inet6_dev *idev)
3263{
c5e33bdd
YH		 3264 struct inet6_ifaddr *ifp;
3265
3266 read_lock_bh(&idev->lock);
502a2ffd 3267 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3268 spin_lock(&ifp->lock);
f2344a13
HX		 3269 if (ifp->flags & IFA_F_TENTATIVE &&
3270 ifp->state == INET6_IFADDR_STATE_DAD)
3271 addrconf_dad_kick(ifp);
21809faf 3272 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3273 }
3274 read_unlock_bh(&idev->lock);
3275}
3276
1da177e4
LT		 3277#ifdef CONFIG_PROC_FS
3278struct if6_iter_state {
3c40090a 3279 struct seq_net_private p;
1da177e4 3280 int bucket;
1d578303 3281 int offset;
1da177e4
LT		 3282};
3283
1d578303 3284static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3285{
3286 struct inet6_ifaddr *ifa = NULL;
3287 struct if6_iter_state *state = seq->private;
1218854a 3288 struct net *net = seq_file_net(seq);
1d578303 3289 int p = 0;
1da177e4 3290
1d578303
MM		 3291 /* initial bucket if pos is 0 */
3292 if (pos == 0) {
3293 state->bucket = 0;
3294 state->offset = 0;
3295 }
3296
3297 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3298 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3299 addr_lst) {
9f0d3c27
ED		 3300 if (!net_eq(dev_net(ifa->idev->dev), net))
3301 continue;
1d578303
MM		 3302 /* sync with offset */
3303 if (p < state->offset) {
3304 p++;
3305 continue;
3306 }
3307 state->offset++;
9f0d3c27 3308 return ifa;
1d578303
MM		 3309 }
3310
3311 /* prepare for next bucket */
3312 state->offset = 0;
3313 p = 0;
1da177e4 3314 }
c2e21293 3315 return NULL;
1da177e4
LT		 3316}
3317
c2e21293 3318static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3319 struct inet6_ifaddr *ifa)
1da177e4
LT		 3320{
3321 struct if6_iter_state *state = seq->private;
1218854a 3322 struct net *net = seq_file_net(seq);
1da177e4 3323
b67bfe0d 3324 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3325 if (!net_eq(dev_net(ifa->idev->dev), net))
3326 continue;
1d578303 3327 state->offset++;
9f0d3c27 3328 return ifa;
1d578303 3329 }
3c40090a 3330
c2e21293 3331 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3332 state->offset = 0;
b67bfe0d 3333 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3334 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3335 if (!net_eq(dev_net(ifa->idev->dev), net))
3336 continue;
1d578303 3337 state->offset++;
9f0d3c27 3338 return ifa;
c2e21293 3339 }
1da177e4 3340 }
3c40090a 3341
c2e21293 3342 return NULL;
1da177e4
LT		 3343}
3344
1da177e4 3345static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3346 __acquires(rcu_bh)
1da177e4 3347{
5c578aed 3348 rcu_read_lock_bh();
1d578303 3349 return if6_get_first(seq, *pos);
1da177e4
LT		 3350}
3351
3352static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3353{
3354 struct inet6_ifaddr *ifa;
3355
3356 ifa = if6_get_next(seq, v);
3357 ++*pos;
3358 return ifa;
3359}
3360
3361static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3362 __releases(rcu_bh)
1da177e4 3363{
5c578aed 3364 rcu_read_unlock_bh();
1da177e4
LT		 3365}
3366
3367static int if6_seq_show(struct seq_file *seq, void *v)
3368{
3369 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 3370 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3371 &ifp->addr,
1da177e4
LT		 3372 ifp->idev->dev->ifindex,
3373 ifp->prefix_len,
3374 ifp->scope,
971a351c 3375 (u8) ifp->flags,
1da177e4
LT		 3376 ifp->idev->dev->name);
3377 return 0;
3378}
3379
56b3d975 3380static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3381 .start = if6_seq_start,
3382 .next = if6_seq_next,
3383 .show = if6_seq_show,
3384 .stop = if6_seq_stop,
3385};
3386
3387static int if6_seq_open(struct inode *inode, struct file *file)
3388{
3c40090a
DL		 3389 return seq_open_net(inode, file, &if6_seq_ops,
3390 sizeof(struct if6_iter_state));
1da177e4
LT		 3391}
3392
9a32144e 3393static const struct file_operations if6_fops = {
1da177e4
LT		 3394 .owner = THIS_MODULE,
3395 .open = if6_seq_open,
3396 .read = seq_read,
3397 .llseek = seq_lseek,
3c40090a 3398 .release = seq_release_net,
1da177e4
LT		 3399};
3400
2c8c1e72 3401static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3402{
d4beaa66 3403 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 3404 return -ENOMEM;
3405 return 0;
3406}
3407
2c8c1e72 3408static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 3409{
ece31ffd 3410 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 3411}
3412
3413static struct pernet_operations if6_proc_net_ops = {
3414 .init = if6_proc_net_init,
3415 .exit = if6_proc_net_exit,
3416};
3417
3418int __init if6_proc_init(void)
3419{
3420 return register_pernet_subsys(&if6_proc_net_ops);
3421}
3422
1da177e4
LT		 3423void if6_proc_exit(void)
3424{
3c40090a 3425 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3426}
3427#endif /* CONFIG_PROC_FS */
3428
07a93626 3429#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3430/* Check if address is a home address configured on any interface. */
b71d1d42 3431int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3432{
3433 int ret = 0;
c2e21293 3434 struct inet6_ifaddr *ifp = NULL;
ddbe5032 3435 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3436
5c578aed 3437 rcu_read_lock_bh();
b67bfe0d 3438 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 3439 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3440 continue;
caad295f 3441 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3442 (ifp->flags & IFA_F_HOMEADDRESS)) {
3443 ret = 1;
3444 break;
3445 }
3446 }
5c578aed 3447 rcu_read_unlock_bh();
3b9f9a1c
NT		 3448 return ret;
3449}
3450#endif
3451
1da177e4
LT		 3452/*
3453 * Periodic address status verification
3454 */
3455
3456static void addrconf_verify(unsigned long foo)
3457{
b2db7564 3458 unsigned long now, next, next_sec, next_sched;
1da177e4 3459 struct inet6_ifaddr *ifp;
1da177e4
LT		 3460 int i;
3461
5c578aed 3462 rcu_read_lock_bh();
3463 spin_lock(&addrconf_verify_lock);
1da177e4 3464 now = jiffies;
b2db7564 3465 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4
LT		 3466
3467 del_timer(&addr_chk_timer);
3468
bcdd553f 3469 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3470restart:
b67bfe0d 3471 hlist_for_each_entry_rcu_bh(ifp,
5c578aed 3472 &inet6_addr_lst[i], addr_lst) {
1da177e4 3473 unsigned long age;
1da177e4
LT		 3474
3475 if (ifp->flags & IFA_F_PERMANENT)
3476 continue;
3477
3478 spin_lock(&ifp->lock);
b2db7564
YH		 3479 /* We try to batch several events at once. */
3480 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3481
8f27ebb9
YH		 3482 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3483 age >= ifp->valid_lft) {
1da177e4
LT		 3484 spin_unlock(&ifp->lock);
3485 in6_ifa_hold(ifp);
1da177e4
LT		 3486 ipv6_del_addr(ifp);
3487 goto restart;
8f27ebb9
YH		 3488 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3489 spin_unlock(&ifp->lock);
3490 continue;
1da177e4 3491 } else if (age >= ifp->prefered_lft) {
a1ed0526 3492 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3493 int deprecate = 0;
3494
3495 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3496 deprecate = 1;
3497 ifp->flags |= IFA_F_DEPRECATED;
3498 }
3499
3500 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3501 next = ifp->tstamp + ifp->valid_lft * HZ;
3502
3503 spin_unlock(&ifp->lock);
3504
3505 if (deprecate) {
3506 in6_ifa_hold(ifp);
1da177e4
LT		 3507
3508 ipv6_ifa_notify(0, ifp);
3509 in6_ifa_put(ifp);
3510 goto restart;
3511 }
1da177e4
LT		 3512 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3513 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3514 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3515 ifp->idev->cnf.dad_transmits *
1f9248e5 3516 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 3517
1da177e4
LT		 3518 if (age >= ifp->prefered_lft - regen_advance) {
3519 struct inet6_ifaddr *ifpub = ifp->ifpub;
3520 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3521 next = ifp->tstamp + ifp->prefered_lft * HZ;
3522 if (!ifp->regen_count && ifpub) {
3523 ifp->regen_count++;
3524 in6_ifa_hold(ifp);
3525 in6_ifa_hold(ifpub);
3526 spin_unlock(&ifp->lock);
5c578aed 3527
291d809b
HY		 3528 spin_lock(&ifpub->lock);
3529 ifpub->regen_count = 0;
3530 spin_unlock(&ifpub->lock);
1da177e4
LT		 3531 ipv6_create_tempaddr(ifpub, ifp);
3532 in6_ifa_put(ifpub);
3533 in6_ifa_put(ifp);
3534 goto restart;
3535 }
3536 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3537 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3538 spin_unlock(&ifp->lock);
1da177e4
LT		 3539 } else {
3540 /* ifp->prefered_lft <= ifp->valid_lft */
3541 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3542 next = ifp->tstamp + ifp->prefered_lft * HZ;
3543 spin_unlock(&ifp->lock);
3544 }
3545 }
1da177e4
LT		 3546 }
3547
b2db7564
YH		 3548 next_sec = round_jiffies_up(next);
3549 next_sched = next;
3550
3551 /* If rounded timeout is accurate enough, accept it. */
3552 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3553 next_sched = next_sec;
3554
3555 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3556 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3557 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3558
ba3542e1 3559 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3560 now, next, next_sec, next_sched);
b2db7564
YH		 3561
3562 addr_chk_timer.expires = next_sched;
1da177e4 3563 add_timer(&addr_chk_timer);
5c578aed 3564 spin_unlock(&addrconf_verify_lock);
3565 rcu_read_unlock_bh();
1da177e4
LT		 3566}
3567
caeaba79
ND		 3568static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3569 struct in6_addr **peer_pfx)
461d8837
TG		 3570{
3571 struct in6_addr *pfx = NULL;
3572
caeaba79
ND		 3573 *peer_pfx = NULL;
3574
461d8837
TG		 3575 if (addr)
3576 pfx = nla_data(addr);
3577
3578 if (local) {
3579 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 3580 *peer_pfx = pfx;
3581 pfx = nla_data(local);
461d8837
TG		 3582 }
3583
3584 return pfx;
3585}
3586
ef7c79ed 3587static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3588 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3589 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3590 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 3591 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 3592};
3593
1da177e4 3594static int
661d2967 3595inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3596{
3b1e0a65 3597 struct net *net = sock_net(skb->sk);
b933f716
TG		 3598 struct ifaddrmsg *ifm;
3599 struct nlattr *tb[IFA_MAX+1];
caeaba79 3600 struct in6_addr *pfx, *peer_pfx;
b933f716 3601 int err;
1da177e4 3602
b933f716
TG		 3603 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3604 if (err < 0)
3605 return err;
3606
3607 ifm = nlmsg_data(nlh);
caeaba79 3608 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3609 if (pfx == NULL)
3610 return -EINVAL;
3611
af284937 3612 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3613}
3614
479840ff 3615static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 3616 u32 prefered_lft, u32 valid_lft)
081bba5b 3617{
6f704992
YH		 3618 u32 flags;
3619 clock_t expires;
4bed72e4 3620 unsigned long timeout;
53bd6749 3621 bool was_managetempaddr;
46d48046 3622
081bba5b
NT		 3623 if (!valid_lft || (prefered_lft > valid_lft))
3624 return -EINVAL;
3625
53bd6749
JP		 3626 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
3627 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
3628 return -EINVAL;
3629
4bed72e4
YH		 3630 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3631 if (addrconf_finite_timeout(timeout)) {
3632 expires = jiffies_to_clock_t(timeout * HZ);
3633 valid_lft = timeout;
6f704992 3634 flags = RTF_EXPIRES;
4bed72e4
YH		 3635 } else {
3636 expires = 0;
3637 flags = 0;
3638 ifa_flags |= IFA_F_PERMANENT;
6f704992 3639 }
081bba5b 3640
4bed72e4
YH		 3641 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3642 if (addrconf_finite_timeout(timeout)) {
3643 if (timeout == 0)
3644 ifa_flags |= IFA_F_DEPRECATED;
3645 prefered_lft = timeout;
3646 }
081bba5b
NT		 3647
3648 spin_lock_bh(&ifp->lock);
53bd6749
JP		 3649 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
3650 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
3651 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR);
3652 ifp->flags |= ifa_flags;
081bba5b
NT		 3653 ifp->tstamp = jiffies;
3654 ifp->valid_lft = valid_lft;
3655 ifp->prefered_lft = prefered_lft;
3656
3657 spin_unlock_bh(&ifp->lock);
3658 if (!(ifp->flags&IFA_F_TENTATIVE))
3659 ipv6_ifa_notify(0, ifp);
081bba5b 3660
46d48046 3661 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3662 expires, flags);
53bd6749
JP		 3663
3664 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
3665 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
3666 valid_lft = prefered_lft = 0;
3667 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
3668 !was_managetempaddr, jiffies);
3669 }
3670
081bba5b
NT		 3671 addrconf_verify(0);
3672
3673 return 0;
3674}
3675
1da177e4 3676static int
661d2967 3677inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3678{
3b1e0a65 3679 struct net *net = sock_net(skb->sk);
461d8837
TG		 3680 struct ifaddrmsg *ifm;
3681 struct nlattr *tb[IFA_MAX+1];
caeaba79 3682 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 3683 struct inet6_ifaddr *ifa;
3684 struct net_device *dev;
55ebaef1 3685 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 3686 u32 ifa_flags;
461d8837 3687 int err;
1da177e4 3688
461d8837
TG		 3689 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3690 if (err < 0)
3691 return err;
3692
3693 ifm = nlmsg_data(nlh);
caeaba79 3694 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3695 if (pfx == NULL)
3696 return -EINVAL;
3697
461d8837 3698 if (tb[IFA_CACHEINFO]) {
0778769d 3699 struct ifa_cacheinfo *ci;
461d8837
TG		 3700
3701 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3702 valid_lft = ci->ifa_valid;
461d8837
TG		 3703 preferred_lft = ci->ifa_prefered;
3704 } else {
3705 preferred_lft = INFINITY_LIFE_TIME;
3706 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3707 }
3708
af284937 3709 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3710 if (dev == NULL)
3711 return -ENODEV;
3712
479840ff
JP		 3713 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3714
55ebaef1 3715 /* We ignore other flags so far. */
53bd6749 3716 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR;
55ebaef1 3717
1cab3da6 3718 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3719 if (ifa == NULL) {
3720 /*
3721 * It would be best to check for !NLM_F_CREATE here but
3722 * userspace alreay relies on not having to provide this.
3723 */
caeaba79 3724 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 3725 ifm->ifa_prefixlen, ifa_flags,
3726 preferred_lft, valid_lft);
081bba5b
NT		 3727 }
3728
7198f8ce
TG		 3729 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3730 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3731 err = -EEXIST;
3732 else
55ebaef1 3733 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3734
3735 in6_ifa_put(ifa);
3736
3737 return err;
1da177e4
LT		 3738}
3739
479840ff 3740static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 3741 u8 scope, int ifindex)
3742{
3743 struct ifaddrmsg *ifm;
3744
3745 ifm = nlmsg_data(nlh);
3746 ifm->ifa_family = AF_INET6;
3747 ifm->ifa_prefixlen = prefixlen;
3748 ifm->ifa_flags = flags;
3749 ifm->ifa_scope = scope;
3750 ifm->ifa_index = ifindex;
3751}
3752
85486af0
TG		 3753static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3754 unsigned long tstamp, u32 preferred, u32 valid)
3755{
3756 struct ifa_cacheinfo ci;
3757
18a31e1e
TG		 3758 ci.cstamp = cstamp_delta(cstamp);
3759 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 3760 ci.ifa_prefered = preferred;
3761 ci.ifa_valid = valid;
3762
3763 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3764}
3765
101bb229
TG		 3766static inline int rt_scope(int ifa_scope)
3767{
3768 if (ifa_scope & IFA_HOST)
3769 return RT_SCOPE_HOST;
3770 else if (ifa_scope & IFA_LINK)
3771 return RT_SCOPE_LINK;
3772 else if (ifa_scope & IFA_SITE)
3773 return RT_SCOPE_SITE;
3774 else
3775 return RT_SCOPE_UNIVERSE;
3776}
3777
0ab6803b
TG		 3778static inline int inet6_ifaddr_msgsize(void)
3779{
339bf98f 3780 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 3781 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 3782 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 3783 + nla_total_size(sizeof(struct ifa_cacheinfo))
3784 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 3785}
c5396a31 3786
1da177e4 3787static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 3788 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3789{
1da177e4 3790 struct nlmsghdr *nlh;
85486af0 3791 u32 preferred, valid;
1da177e4 3792
15e47304 3793 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3794 if (nlh == NULL)
26932566 3795 return -EMSGSIZE;
0ab6803b 3796
101bb229
TG		 3797 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3798 ifa->idev->dev->ifindex);
3799
1da177e4 3800 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3801 preferred = ifa->prefered_lft;
3802 valid = ifa->valid_lft;
3803 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3804 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3805 if (preferred > tval)
3806 preferred -= tval;
3807 else
3808 preferred = 0;
f56619fc
BH		 3809 if (valid != INFINITY_LIFE_TIME) {
3810 if (valid > tval)
3811 valid -= tval;
3812 else
3813 valid = 0;
3814 }
1da177e4
LT		 3815 }
3816 } else {
85486af0
TG		 3817 preferred = INFINITY_LIFE_TIME;
3818 valid = INFINITY_LIFE_TIME;
3819 }
3820
7996c799 3821 if (!ipv6_addr_any(&ifa->peer_addr)) {
caeaba79
ND		 3822 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3823 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3824 goto error;
3825 } else
3826 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3827 goto error;
3828
3829 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3830 goto error;
1da177e4 3831
479840ff
JP		 3832 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
3833 goto error;
3834
0ab6803b 3835 return nlmsg_end(skb, nlh);
caeaba79
ND		 3836
3837error:
3838 nlmsg_cancel(skb, nlh);
3839 return -EMSGSIZE;
1da177e4
LT		 3840}
3841
3842static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 3843 u32 portid, u32 seq, int event, u16 flags)
1da177e4 3844{
1da177e4 3845 struct nlmsghdr *nlh;
101bb229
TG		 3846 u8 scope = RT_SCOPE_UNIVERSE;
3847 int ifindex = ifmca->idev->dev->ifindex;
3848
3849 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3850 scope = RT_SCOPE_SITE;
1da177e4 3851
15e47304 3852 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3853 if (nlh == NULL)
26932566 3854 return -EMSGSIZE;
85486af0 3855
0ab6803b
TG		 3856 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3857 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3858 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3859 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3860 nlmsg_cancel(skb, nlh);
3861 return -EMSGSIZE;
3862 }
85486af0 3863
0ab6803b 3864 return nlmsg_end(skb, nlh);
1da177e4
LT		 3865}
3866
3867static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 3868 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3869{
1da177e4 3870 struct nlmsghdr *nlh;
101bb229
TG		 3871 u8 scope = RT_SCOPE_UNIVERSE;
3872 int ifindex = ifaca->aca_idev->dev->ifindex;
3873
3874 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3875 scope = RT_SCOPE_SITE;
1da177e4 3876
15e47304 3877 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3878 if (nlh == NULL)
26932566 3879 return -EMSGSIZE;
85486af0 3880
0ab6803b
TG		 3881 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3882 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3883 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3884 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3885 nlmsg_cancel(skb, nlh);
3886 return -EMSGSIZE;
3887 }
1da177e4 3888
0ab6803b 3889 return nlmsg_end(skb, nlh);
1da177e4
LT		 3890}
3891
e21e8467 3892enum addr_type_t {
1da177e4
LT		 3893 UNICAST_ADDR,
3894 MULTICAST_ADDR,
3895 ANYCAST_ADDR,
3896};
3897
234b27c3
ED		 3898/* called with rcu_read_lock() */
3899static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3900 struct netlink_callback *cb, enum addr_type_t type,
3901 int s_ip_idx, int *p_ip_idx)
3902{
234b27c3
ED		 3903 struct ifmcaddr6 *ifmca;
3904 struct ifacaddr6 *ifaca;
3905 int err = 1;
3906 int ip_idx = *p_ip_idx;
3907
3908 read_lock_bh(&idev->lock);
3909 switch (type) {
502a2ffd 3910 case UNICAST_ADDR: {
3911 struct inet6_ifaddr *ifa;
3912
234b27c3 3913 /* unicast address incl. temp addr */
502a2ffd 3914 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3915 if (++ip_idx < s_ip_idx)
234b27c3
ED		 3916 continue;
3917 err = inet6_fill_ifaddr(skb, ifa,
15e47304 3918 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3919 cb->nlh->nlmsg_seq,
3920 RTM_NEWADDR,
3921 NLM_F_MULTI);
3922 if (err <= 0)
3923 break;
63998ac2 3924 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 3925 }
3926 break;
502a2ffd 3927 }
234b27c3
ED		 3928 case MULTICAST_ADDR:
3929 /* multicast address */
3930 for (ifmca = idev->mc_list; ifmca;
3931 ifmca = ifmca->next, ip_idx++) {
3932 if (ip_idx < s_ip_idx)
3933 continue;
3934 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 3935 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3936 cb->nlh->nlmsg_seq,
3937 RTM_GETMULTICAST,
3938 NLM_F_MULTI);
3939 if (err <= 0)
3940 break;
3941 }
3942 break;
3943 case ANYCAST_ADDR:
3944 /* anycast address */
3945 for (ifaca = idev->ac_list; ifaca;
3946 ifaca = ifaca->aca_next, ip_idx++) {
3947 if (ip_idx < s_ip_idx)
3948 continue;
3949 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 3950 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3951 cb->nlh->nlmsg_seq,
3952 RTM_GETANYCAST,
3953 NLM_F_MULTI);
3954 if (err <= 0)
3955 break;
3956 }
3957 break;
3958 default:
3959 break;
3960 }
3961 read_unlock_bh(&idev->lock);
3962 *p_ip_idx = ip_idx;
3963 return err;
3964}
3965
1da177e4
LT		 3966static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3967 enum addr_type_t type)
3968{
234b27c3
ED		 3969 struct net *net = sock_net(skb->sk);
3970 int h, s_h;
1da177e4
LT		 3971 int idx, ip_idx;
3972 int s_idx, s_ip_idx;
1da177e4 3973 struct net_device *dev;
234b27c3
ED		 3974 struct inet6_dev *idev;
3975 struct hlist_head *head;
1ab1457c 3976
234b27c3
ED		 3977 s_h = cb->args[0];
3978 s_idx = idx = cb->args[1];
3979 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 3980
234b27c3 3981 rcu_read_lock();
63998ac2 3982 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 3983 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3984 idx = 0;
3985 head = &net->dev_index_head[h];
b67bfe0d 3986 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 3987 if (idx < s_idx)
3988 goto cont;
4b97efdf 3989 if (h > s_h || idx > s_idx)
234b27c3
ED		 3990 s_ip_idx = 0;
3991 ip_idx = 0;
e21e8467
SH		 3992 idev = __in6_dev_get(dev);
3993 if (!idev)
234b27c3
ED		 3994 goto cont;
3995
3996 if (in6_dump_addrs(idev, skb, cb, type,
3997 s_ip_idx, &ip_idx) <= 0)
3998 goto done;
7562f876 3999cont:
234b27c3
ED		 4000 idx++;
4001 }
1da177e4 4002 }
234b27c3
ED		 4003done:
4004 rcu_read_unlock();
4005 cb->args[0] = h;
4006 cb->args[1] = idx;
4007 cb->args[2] = ip_idx;
4008
1da177e4
LT		 4009 return skb->len;
4010}
4011
4012static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4013{
4014 enum addr_type_t type = UNICAST_ADDR;
b854272b 4015
1da177e4
LT		 4016 return inet6_dump_addr(skb, cb, type);
4017}
4018
4019static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4020{
4021 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4022
1da177e4
LT		 4023 return inet6_dump_addr(skb, cb, type);
4024}
4025
4026
4027static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4028{
4029 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4030
1da177e4
LT		 4031 return inet6_dump_addr(skb, cb, type);
4032}
4033
661d2967 4034static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4035{
3b1e0a65 4036 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4037 struct ifaddrmsg *ifm;
4038 struct nlattr *tb[IFA_MAX+1];
caeaba79 4039 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4040 struct net_device *dev = NULL;
4041 struct inet6_ifaddr *ifa;
4042 struct sk_buff *skb;
6c223828
NT		 4043 int err;
4044
1b29fc2c
TG		 4045 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4046 if (err < 0)
4047 goto errout;
4048
caeaba79 4049 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
1b29fc2c
TG		 4050 if (addr == NULL) {
4051 err = -EINVAL;
4052 goto errout;
6c223828 4053 }
6c223828 4054
1b29fc2c 4055 ifm = nlmsg_data(nlh);
6c223828 4056 if (ifm->ifa_index)
6fda7350 4057 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4058
e21e8467
SH		 4059 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4060 if (!ifa) {
1b29fc2c
TG		 4061 err = -EADDRNOTAVAIL;
4062 goto errout;
4063 }
6c223828 4064
e21e8467
SH		 4065 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4066 if (!skb) {
6c223828 4067 err = -ENOBUFS;
1b29fc2c 4068 goto errout_ifa;
6c223828
NT		 4069 }
4070
15e47304 4071 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4072 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4073 if (err < 0) {
4074 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4075 WARN_ON(err == -EMSGSIZE);
4076 kfree_skb(skb);
4077 goto errout_ifa;
4078 }
15e47304 4079 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4080errout_ifa:
6c223828 4081 in6_ifa_put(ifa);
1b29fc2c 4082errout:
6c223828 4083 return err;
6c223828
NT		 4084}
4085
1da177e4
LT		 4086static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4087{
4088 struct sk_buff *skb;
c346dca1 4089 struct net *net = dev_net(ifa->idev->dev);
5d620266 4090 int err = -ENOBUFS;
1da177e4 4091
0ab6803b 4092 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 4093 if (skb == NULL)
4094 goto errout;
4095
4096 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4097 if (err < 0) {
4098 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4099 WARN_ON(err == -EMSGSIZE);
4100 kfree_skb(skb);
4101 goto errout;
4102 }
1ce85fe4
PNA		 4103 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4104 return;
5d620266
TG		 4105errout:
4106 if (err < 0)
6fda7350 4107 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4108}
4109
b6f99a21 4110static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4111 __s32 *array, int bytes)
4112{
04561c1f
TG		 4113 BUG_ON(bytes < (DEVCONF_MAX * 4));
4114
1da177e4
LT		 4115 memset(array, 0, bytes);
4116 array[DEVCONF_FORWARDING] = cnf->forwarding;
4117 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4118 array[DEVCONF_MTU6] = cnf->mtu6;
4119 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4120 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4121 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4122 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4123 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4124 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4125 jiffies_to_msecs(cnf->rtr_solicit_interval);
4126 array[DEVCONF_RTR_SOLICIT_DELAY] =
4127 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4128 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4129 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4130 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4131 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4132 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4133 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4134 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4135 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4136 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4137 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4138 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4139 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 4140 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4141#ifdef CONFIG_IPV6_ROUTER_PREF
4142 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4143 array[DEVCONF_RTR_PROBE_INTERVAL] =
4144 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4145#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4146 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4147#endif
930d6ff2 4148#endif
fbea49e1 4149 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4150 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4151#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4152 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4153#endif
7bc570c8
YH		 4154#ifdef CONFIG_IPV6_MROUTE
4155 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4156#endif
778d80be 4157 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4158 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4159 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4160 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 4161 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
1da177e4
LT		 4162}
4163
b382b191
TG		 4164static inline size_t inet6_ifla6_size(void)
4165{
4166 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4167 + nla_total_size(sizeof(struct ifla_cacheinfo))
4168 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4169 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4170 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4171 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4172}
4173
339bf98f
TG		 4174static inline size_t inet6_if_nlmsg_size(void)
4175{
4176 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4177 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4178 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4179 + nla_total_size(4) /* IFLA_MTU */
4180 + nla_total_size(4) /* IFLA_LINK */
b382b191 4181 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4182}
c5396a31 4183
be281e55 4184static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4185 int items, int bytes)
7f7d9a6b
HX		 4186{
4187 int i;
4188 int pad = bytes - sizeof(u64) * items;
4189 BUG_ON(pad < 0);
4190
4191 /* Use put_unaligned() because stats may not be aligned for u64. */
4192 put_unaligned(items, &stats[0]);
4193 for (i = 1; i < items; i++)
be281e55 4194 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4195
4196 memset(&stats[items], 0, pad);
4197}
4198
4ce3c183
ED		 4199static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4200 int items, int bytes, size_t syncpoff)
4201{
4202 int i;
4203 int pad = bytes - sizeof(u64) * items;
4204 BUG_ON(pad < 0);
4205
4206 /* Use put_unaligned() because stats may not be aligned for u64. */
4207 put_unaligned(items, &stats[0]);
4208 for (i = 1; i < items; i++)
4209 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4210
4211 memset(&stats[items], 0, pad);
4212}
4213
7f7d9a6b
HX		 4214static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4215 int bytes)
4216{
e21e8467 4217 switch (attrtype) {
7f7d9a6b 4218 case IFLA_INET6_STATS:
4ce3c183
ED		 4219 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4220 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4221 break;
4222 case IFLA_INET6_ICMP6STATS:
be281e55 4223 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4224 break;
4225 }
4226}
4227
b382b191
TG		 4228static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4229{
4230 struct nlattr *nla;
4231 struct ifla_cacheinfo ci;
4232
c78679e8
DM		 4233 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4234 goto nla_put_failure;
b382b191 4235 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4236 ci.tstamp = cstamp_delta(idev->tstamp);
4237 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 4238 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 4239 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4240 goto nla_put_failure;
b382b191
TG		 4241 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4242 if (nla == NULL)
4243 goto nla_put_failure;
4244 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4245
4246 /* XXX - MC not implemented */
4247
4248 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4249 if (nla == NULL)
4250 goto nla_put_failure;
4251 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4252
4253 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4254 if (nla == NULL)
4255 goto nla_put_failure;
4256 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4257
f53adae4
DB		 4258 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4259 if (nla == NULL)
4260 goto nla_put_failure;
4261 read_lock_bh(&idev->lock);
4262 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4263 read_unlock_bh(&idev->lock);
4264
b382b191
TG		 4265 return 0;
4266
4267nla_put_failure:
4268 return -EMSGSIZE;
4269}
4270
4271static size_t inet6_get_link_af_size(const struct net_device *dev)
4272{
4273 if (!__in6_dev_get(dev))
4274 return 0;
4275
4276 return inet6_ifla6_size();
4277}
4278
4279static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4280{
4281 struct inet6_dev *idev = __in6_dev_get(dev);
4282
4283 if (!idev)
4284 return -ENODATA;
4285
4286 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4287 return -EMSGSIZE;
4288
4289 return 0;
4290}
4291
f53adae4
DB		 4292static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4293{
f53adae4
DB		 4294 struct inet6_ifaddr *ifp;
4295 struct net_device *dev = idev->dev;
fc403832 4296 bool update_rs = false;
dc848292 4297 struct in6_addr ll_addr;
f53adae4
DB		 4298
4299 if (token == NULL)
4300 return -EINVAL;
4301 if (ipv6_addr_any(token))
4302 return -EINVAL;
4303 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4304 return -EINVAL;
f53adae4
DB		 4305 if (!ipv6_accept_ra(idev))
4306 return -EINVAL;
4307 if (idev->cnf.rtr_solicits <= 0)
4308 return -EINVAL;
4309
4310 write_lock_bh(&idev->lock);
4311
4312 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4313 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4314
4315 write_unlock_bh(&idev->lock);
4316
dc848292
HFS		 4317 if (!idev->dead && (idev->if_flags & IF_READY) &&
4318 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4319 IFA_F_OPTIMISTIC)) {
fc403832
DB		 4320
4321 /* If we're not ready, then normal ifup will take care
4322 * of this. Otherwise, we need to request our rs here.
4323 */
4324 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4325 update_rs = true;
4326 }
f53adae4
DB		 4327
4328 write_lock_bh(&idev->lock);
fc403832 4329
77ecaace 4330 if (update_rs) {
fc403832 4331 idev->if_flags |= IF_RS_SENT;
77ecaace
HFS		 4332 idev->rs_probes = 1;
4333 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4334 }
f53adae4
DB		 4335
4336 /* Well, that's kinda nasty ... */
4337 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4338 spin_lock(&ifp->lock);
617fe29d 4339 if (ifp->tokenized) {
f53adae4
DB		 4340 ifp->valid_lft = 0;
4341 ifp->prefered_lft = 0;
4342 }
4343 spin_unlock(&ifp->lock);
4344 }
4345
4346 write_unlock_bh(&idev->lock);
2b9651d7 4347 addrconf_verify(0);
f53adae4
DB		 4348 return 0;
4349}
4350
4351static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4352{
4353 int err = -EINVAL;
4354 struct inet6_dev *idev = __in6_dev_get(dev);
4355 struct nlattr *tb[IFLA_INET6_MAX + 1];
4356
4357 if (!idev)
4358 return -EAFNOSUPPORT;
4359
4360 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4361 BUG();
4362
4363 if (tb[IFLA_INET6_TOKEN])
4364 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4365
4366 return err;
4367}
4368
1ab1457c 4369static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4370 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4371{
04561c1f 4372 struct net_device *dev = idev->dev;
04561c1f
TG		 4373 struct ifinfomsg *hdr;
4374 struct nlmsghdr *nlh;
4375 void *protoinfo;
04561c1f 4376
15e47304 4377 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
04561c1f 4378 if (nlh == NULL)
26932566 4379 return -EMSGSIZE;
04561c1f
TG		 4380
4381 hdr = nlmsg_data(nlh);
4382 hdr->ifi_family = AF_INET6;
4383 hdr->__ifi_pad = 0;
4384 hdr->ifi_type = dev->type;
4385 hdr->ifi_index = dev->ifindex;
4386 hdr->ifi_flags = dev_get_flags(dev);
4387 hdr->ifi_change = 0;
4388
c78679e8
DM		 4389 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4390 (dev->addr_len &&
4391 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4392 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4393 (dev->ifindex != dev->iflink &&
4394 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4395 goto nla_put_failure;
04561c1f
TG		 4396 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4397 if (protoinfo == NULL)
4398 goto nla_put_failure;
1da177e4 4399
b382b191 4400 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4401 goto nla_put_failure;
1da177e4 4402
04561c1f
TG		 4403 nla_nest_end(skb, protoinfo);
4404 return nlmsg_end(skb, nlh);
1da177e4 4405
04561c1f 4406nla_put_failure:
26932566
PM		 4407 nlmsg_cancel(skb, nlh);
4408 return -EMSGSIZE;
1da177e4
LT		 4409}
4410
4411static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4412{
3b1e0a65 4413 struct net *net = sock_net(skb->sk);
84d2697d 4414 int h, s_h;
434a8a58 4415 int idx = 0, s_idx;
1da177e4
LT		 4416 struct net_device *dev;
4417 struct inet6_dev *idev;
84d2697d 4418 struct hlist_head *head;
1da177e4 4419
84d2697d
ED		 4420 s_h = cb->args[0];
4421 s_idx = cb->args[1];
4422
4423 rcu_read_lock();
4424 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4425 idx = 0;
4426 head = &net->dev_index_head[h];
b67bfe0d 4427 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 4428 if (idx < s_idx)
4429 goto cont;
4430 idev = __in6_dev_get(dev);
4431 if (!idev)
4432 goto cont;
4433 if (inet6_fill_ifinfo(skb, idev,
15e47304 4434 NETLINK_CB(cb->skb).portid,
84d2697d
ED		 4435 cb->nlh->nlmsg_seq,
4436 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4437 goto out;
7562f876 4438cont:
84d2697d
ED		 4439 idx++;
4440 }
1da177e4 4441 }
84d2697d
ED		 4442out:
4443 rcu_read_unlock();
4444 cb->args[1] = idx;
4445 cb->args[0] = h;
1da177e4
LT		 4446
4447 return skb->len;
4448}
4449
4450void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4451{
4452 struct sk_buff *skb;
c346dca1 4453 struct net *net = dev_net(idev->dev);
8d7a76c9 4454 int err = -ENOBUFS;
1ab1457c 4455
339bf98f 4456 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4457 if (skb == NULL)
4458 goto errout;
4459
4460 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4461 if (err < 0) {
4462 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4463 WARN_ON(err == -EMSGSIZE);
4464 kfree_skb(skb);
4465 goto errout;
4466 }
5f75a104 4467 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4468 return;
8d7a76c9
TG		 4469errout:
4470 if (err < 0)
5f75a104 4471 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4472}
4473
339bf98f
TG		 4474static inline size_t inet6_prefix_nlmsg_size(void)
4475{
4476 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4477 + nla_total_size(sizeof(struct in6_addr))
4478 + nla_total_size(sizeof(struct prefix_cacheinfo));
4479}
c5396a31 4480
1da177e4 4481static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4482 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 4483 int event, unsigned int flags)
1da177e4 4484{
6051e2f4
TG		 4485 struct prefixmsg *pmsg;
4486 struct nlmsghdr *nlh;
1da177e4
LT		 4487 struct prefix_cacheinfo ci;
4488
15e47304 4489 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6051e2f4 4490 if (nlh == NULL)
26932566 4491 return -EMSGSIZE;
6051e2f4
TG		 4492
4493 pmsg = nlmsg_data(nlh);
1da177e4 4494 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4495 pmsg->prefix_pad1 = 0;
4496 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4497 pmsg->prefix_ifindex = idev->dev->ifindex;
4498 pmsg->prefix_len = pinfo->prefix_len;
4499 pmsg->prefix_type = pinfo->type;
8a47077a 4500 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4501 pmsg->prefix_flags = 0;
4502 if (pinfo->onlink)
4503 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4504 if (pinfo->autoconf)
4505 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4506
c78679e8
DM		 4507 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4508 goto nla_put_failure;
1da177e4
LT		 4509 ci.preferred_time = ntohl(pinfo->prefered);
4510 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 4511 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4512 goto nla_put_failure;
6051e2f4 4513 return nlmsg_end(skb, nlh);
1da177e4 4514
6051e2f4 4515nla_put_failure:
26932566
PM		 4516 nlmsg_cancel(skb, nlh);
4517 return -EMSGSIZE;
1da177e4
LT		 4518}
4519
1ab1457c 4520static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4521 struct prefix_info *pinfo)
4522{
4523 struct sk_buff *skb;
c346dca1 4524 struct net *net = dev_net(idev->dev);
8c384bfa 4525 int err = -ENOBUFS;
1da177e4 4526
339bf98f 4527 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4528 if (skb == NULL)
4529 goto errout;
4530
4531 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4532 if (err < 0) {
4533 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4534 WARN_ON(err == -EMSGSIZE);
4535 kfree_skb(skb);
4536 goto errout;
4537 }
1ce85fe4
PNA		 4538 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4539 return;
8c384bfa
TG		 4540errout:
4541 if (err < 0)
6fda7350 4542 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4543}
4544
1ec047eb
HFS		 4545static void update_valid_ll_addr_cnt(struct inet6_ifaddr *ifp, int count)
4546{
4547 write_lock_bh(&ifp->idev->lock);
4548 spin_lock(&ifp->lock);
4549 if (((ifp->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|
4550 IFA_F_DADFAILED)) == IFA_F_PERMANENT) &&
4551 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL))
4552 ifp->idev->valid_ll_addr_cnt += count;
4553 WARN_ON(ifp->idev->valid_ll_addr_cnt < 0);
4554 spin_unlock(&ifp->lock);
4555 write_unlock_bh(&ifp->idev->lock);
4556}
4557
1da177e4
LT		 4558static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4559{
63998ac2
ND		 4560 struct net *net = dev_net(ifp->idev->dev);
4561
1da177e4
LT		 4562 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4563
4564 switch (event) {
4565 case RTM_NEWADDR:
1ec047eb
HFS		 4566 update_valid_ll_addr_cnt(ifp, 1);
4567
95c385b4
NH		 4568 /*
4569 * If the address was optimistic
4570 * we inserted the route at the start of
4571 * our DAD process, so we don't need
4572 * to do it again
4573 */
4574 if (!(ifp->rt->rt6i_node))
4575 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4576 if (ifp->idev->cnf.forwarding)
4577 addrconf_join_anycast(ifp);
7996c799 4578 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 4579 addrconf_prefix_route(&ifp->peer_addr, 128,
4580 ifp->idev->dev, 0, 0);
1da177e4
LT		 4581 break;
4582 case RTM_DELADDR:
1ec047eb
HFS		 4583 update_valid_ll_addr_cnt(ifp, -1);
4584
1da177e4
LT		 4585 if (ifp->idev->cnf.forwarding)
4586 addrconf_leave_anycast(ifp);
4587 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 4588 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79
ND		 4589 struct rt6_info *rt;
4590 struct net_device *dev = ifp->idev->dev;
4591
4592 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4593 dev->ifindex, 1);
4594 if (rt) {
4595 dst_hold(&rt->dst);
4596 if (ip6_del_rt(rt))
4597 dst_free(&rt->dst);
4598 }
4599 }
d8d1f30b 4600 dst_hold(&ifp->rt->dst);
93fa159a 4601
73a8bd74 4602 if (ip6_del_rt(ifp->rt))
d8d1f30b 4603 dst_free(&ifp->rt->dst);
1da177e4
LT		 4604 break;
4605 }
63998ac2 4606 atomic_inc(&net->ipv6.dev_addr_genid);
439677d7 4607 rt_genid_bump_ipv6(net);
1da177e4
LT		 4608}
4609
4610static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4611{
8814c4b5 4612 rcu_read_lock_bh();
1da177e4
LT		 4613 if (likely(ifp->idev->dead == 0))
4614 __ipv6_ifa_notify(event, ifp);
8814c4b5 4615 rcu_read_unlock_bh();
1da177e4
LT		 4616}
4617
4618#ifdef CONFIG_SYSCTL
4619
4620static
fe2c6338 4621int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 4622 void __user *buffer, size_t *lenp, loff_t *ppos)
4623{
4624 int *valp = ctl->data;
4625 int val = *valp;
88af182e 4626 loff_t pos = *ppos;
fe2c6338 4627 struct ctl_table lctl;
1da177e4
LT		 4628 int ret;
4629
013d97e9
FR		 4630 /*
4631 * ctl->data points to idev->cnf.forwarding, we should
4632 * not modify it until we get the rtnl lock.
4633 */
4634 lctl = *ctl;
4635 lctl.data = &val;
4636
4637 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 4638
c8fecf22 4639 if (write)
b325fddb 4640 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4641 if (ret)
4642 *ppos = pos;
1ab1457c 4643 return ret;
1da177e4
LT		 4644}
4645
56d417b1
BH		 4646static void dev_disable_change(struct inet6_dev *idev)
4647{
75538c2b
CW		 4648 struct netdev_notifier_info info;
4649
56d417b1
BH		 4650 if (!idev || !idev->dev)
4651 return;
4652
75538c2b 4653 netdev_notifier_info_init(&info, idev->dev);
56d417b1 4654 if (idev->cnf.disable_ipv6)
75538c2b 4655 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 4656 else
75538c2b 4657 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 4658}
4659
4660static void addrconf_disable_change(struct net *net, __s32 newf)
4661{
4662 struct net_device *dev;
4663 struct inet6_dev *idev;
4664
c6d14c84
ED		 4665 rcu_read_lock();
4666 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4667 idev = __in6_dev_get(dev);
4668 if (idev) {
4669 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4670 idev->cnf.disable_ipv6 = newf;
4671 if (changed)
4672 dev_disable_change(idev);
4673 }
56d417b1 4674 }
c6d14c84 4675 rcu_read_unlock();
56d417b1
BH		 4676}
4677
013d97e9 4678static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 4679{
4680 struct net *net;
013d97e9
FR		 4681 int old;
4682
4683 if (!rtnl_trylock())
4684 return restart_syscall();
56d417b1
BH		 4685
4686 net = (struct net *)table->extra2;
013d97e9
FR		 4687 old = *p;
4688 *p = newf;
56d417b1 4689
013d97e9
FR		 4690 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4691 rtnl_unlock();
56d417b1 4692 return 0;
88af182e 4693 }
56d417b1
BH		 4694
4695 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 4696 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4697 addrconf_disable_change(net, newf);
013d97e9 4698 } else if ((!newf) ^ (!old))
56d417b1
BH		 4699 dev_disable_change((struct inet6_dev *)table->extra1);
4700
4701 rtnl_unlock();
4702 return 0;
4703}
4704
4705static
fe2c6338 4706int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 4707 void __user *buffer, size_t *lenp, loff_t *ppos)
4708{
4709 int *valp = ctl->data;
4710 int val = *valp;
88af182e 4711 loff_t pos = *ppos;
fe2c6338 4712 struct ctl_table lctl;
56d417b1
BH		 4713 int ret;
4714
013d97e9
FR		 4715 /*
4716 * ctl->data points to idev->cnf.disable_ipv6, we should
4717 * not modify it until we get the rtnl lock.
4718 */
4719 lctl = *ctl;
4720 lctl.data = &val;
4721
4722 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 4723
4724 if (write)
4725 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4726 if (ret)
4727 *ppos = pos;
56d417b1
BH		 4728 return ret;
4729}
4730
1da177e4
LT		 4731static struct addrconf_sysctl_table
4732{
4733 struct ctl_table_header *sysctl_header;
fe2c6338 4734 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 4735} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4736 .sysctl_header = NULL,
4737 .addrconf_vars = {
1ab1457c 4738 {
e21e8467
SH		 4739 .procname = "forwarding",
4740 .data = &ipv6_devconf.forwarding,
4741 .maxlen = sizeof(int),
4742 .mode = 0644,
4743 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4744 },
4745 {
e21e8467
SH		 4746 .procname = "hop_limit",
4747 .data = &ipv6_devconf.hop_limit,
4748 .maxlen = sizeof(int),
4749 .mode = 0644,
4750 .proc_handler = proc_dointvec,
1da177e4
LT		 4751 },
4752 {
e21e8467
SH		 4753 .procname = "mtu",
4754 .data = &ipv6_devconf.mtu6,
4755 .maxlen = sizeof(int),
4756 .mode = 0644,
4757 .proc_handler = proc_dointvec,
1da177e4
LT		 4758 },
4759 {
e21e8467
SH		 4760 .procname = "accept_ra",
4761 .data = &ipv6_devconf.accept_ra,
4762 .maxlen = sizeof(int),
4763 .mode = 0644,
4764 .proc_handler = proc_dointvec,
1da177e4
LT		 4765 },
4766 {
e21e8467
SH		 4767 .procname = "accept_redirects",
4768 .data = &ipv6_devconf.accept_redirects,
4769 .maxlen = sizeof(int),
4770 .mode = 0644,
4771 .proc_handler = proc_dointvec,
1da177e4
LT		 4772 },
4773 {
e21e8467
SH		 4774 .procname = "autoconf",
4775 .data = &ipv6_devconf.autoconf,
4776 .maxlen = sizeof(int),
4777 .mode = 0644,
4778 .proc_handler = proc_dointvec,
1da177e4
LT		 4779 },
4780 {
e21e8467
SH		 4781 .procname = "dad_transmits",
4782 .data = &ipv6_devconf.dad_transmits,
4783 .maxlen = sizeof(int),
4784 .mode = 0644,
4785 .proc_handler = proc_dointvec,
1da177e4
LT		 4786 },
4787 {
e21e8467
SH		 4788 .procname = "router_solicitations",
4789 .data = &ipv6_devconf.rtr_solicits,
4790 .maxlen = sizeof(int),
4791 .mode = 0644,
4792 .proc_handler = proc_dointvec,
1da177e4
LT		 4793 },
4794 {
e21e8467
SH		 4795 .procname = "router_solicitation_interval",
4796 .data = &ipv6_devconf.rtr_solicit_interval,
4797 .maxlen = sizeof(int),
4798 .mode = 0644,
4799 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4800 },
4801 {
e21e8467
SH		 4802 .procname = "router_solicitation_delay",
4803 .data = &ipv6_devconf.rtr_solicit_delay,
4804 .maxlen = sizeof(int),
4805 .mode = 0644,
4806 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4807 },
4808 {
e21e8467
SH		 4809 .procname = "force_mld_version",
4810 .data = &ipv6_devconf.force_mld_version,
4811 .maxlen = sizeof(int),
4812 .mode = 0644,
4813 .proc_handler = proc_dointvec,
1da177e4 4814 },
fc4eba58
HFS		 4815 {
4816 .procname = "mldv1_unsolicited_report_interval",
4817 .data =
4818 &ipv6_devconf.mldv1_unsolicited_report_interval,
4819 .maxlen = sizeof(int),
4820 .mode = 0644,
4821 .proc_handler = proc_dointvec_ms_jiffies,
4822 },
4823 {
4824 .procname = "mldv2_unsolicited_report_interval",
4825 .data =
4826 &ipv6_devconf.mldv2_unsolicited_report_interval,
4827 .maxlen = sizeof(int),
4828 .mode = 0644,
4829 .proc_handler = proc_dointvec_ms_jiffies,
4830 },
1da177e4 4831 {
e21e8467
SH		 4832 .procname = "use_tempaddr",
4833 .data = &ipv6_devconf.use_tempaddr,
4834 .maxlen = sizeof(int),
4835 .mode = 0644,
4836 .proc_handler = proc_dointvec,
1da177e4
LT		 4837 },
4838 {
e21e8467
SH		 4839 .procname = "temp_valid_lft",
4840 .data = &ipv6_devconf.temp_valid_lft,
4841 .maxlen = sizeof(int),
4842 .mode = 0644,
4843 .proc_handler = proc_dointvec,
1da177e4
LT		 4844 },
4845 {
e21e8467
SH		 4846 .procname = "temp_prefered_lft",
4847 .data = &ipv6_devconf.temp_prefered_lft,
4848 .maxlen = sizeof(int),
4849 .mode = 0644,
4850 .proc_handler = proc_dointvec,
1da177e4
LT		 4851 },
4852 {
e21e8467
SH		 4853 .procname = "regen_max_retry",
4854 .data = &ipv6_devconf.regen_max_retry,
4855 .maxlen = sizeof(int),
4856 .mode = 0644,
4857 .proc_handler = proc_dointvec,
1da177e4
LT		 4858 },
4859 {
e21e8467
SH		 4860 .procname = "max_desync_factor",
4861 .data = &ipv6_devconf.max_desync_factor,
4862 .maxlen = sizeof(int),
4863 .mode = 0644,
4864 .proc_handler = proc_dointvec,
1da177e4 4865 },
1da177e4 4866 {
e21e8467
SH		 4867 .procname = "max_addresses",
4868 .data = &ipv6_devconf.max_addresses,
4869 .maxlen = sizeof(int),
4870 .mode = 0644,
4871 .proc_handler = proc_dointvec,
1da177e4 4872 },
65f5c7c1 4873 {
e21e8467
SH		 4874 .procname = "accept_ra_defrtr",
4875 .data = &ipv6_devconf.accept_ra_defrtr,
4876 .maxlen = sizeof(int),
4877 .mode = 0644,
4878 .proc_handler = proc_dointvec,
65f5c7c1 4879 },
c4fd30eb 4880 {
e21e8467
SH		 4881 .procname = "accept_ra_pinfo",
4882 .data = &ipv6_devconf.accept_ra_pinfo,
4883 .maxlen = sizeof(int),
4884 .mode = 0644,
4885 .proc_handler = proc_dointvec,
c4fd30eb 4886 },
930d6ff2
YH		 4887#ifdef CONFIG_IPV6_ROUTER_PREF
4888 {
e21e8467
SH		 4889 .procname = "accept_ra_rtr_pref",
4890 .data = &ipv6_devconf.accept_ra_rtr_pref,
4891 .maxlen = sizeof(int),
4892 .mode = 0644,
4893 .proc_handler = proc_dointvec,
930d6ff2 4894 },
52e16356 4895 {
e21e8467
SH		 4896 .procname = "router_probe_interval",
4897 .data = &ipv6_devconf.rtr_probe_interval,
4898 .maxlen = sizeof(int),
4899 .mode = 0644,
4900 .proc_handler = proc_dointvec_jiffies,
52e16356 4901 },
fa03ef38 4902#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4903 {
e21e8467
SH		 4904 .procname = "accept_ra_rt_info_max_plen",
4905 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4906 .maxlen = sizeof(int),
4907 .mode = 0644,
4908 .proc_handler = proc_dointvec,
09c884d4
YH		 4909 },
4910#endif
930d6ff2 4911#endif
fbea49e1 4912 {
e21e8467
SH		 4913 .procname = "proxy_ndp",
4914 .data = &ipv6_devconf.proxy_ndp,
4915 .maxlen = sizeof(int),
4916 .mode = 0644,
4917 .proc_handler = proc_dointvec,
fbea49e1 4918 },
0bcbc926 4919 {
e21e8467
SH		 4920 .procname = "accept_source_route",
4921 .data = &ipv6_devconf.accept_source_route,
4922 .maxlen = sizeof(int),
4923 .mode = 0644,
4924 .proc_handler = proc_dointvec,
0bcbc926 4925 },
95c385b4
NH		 4926#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4927 {
e21e8467
SH		 4928 .procname = "optimistic_dad",
4929 .data = &ipv6_devconf.optimistic_dad,
4930 .maxlen = sizeof(int),
4931 .mode = 0644,
4932 .proc_handler = proc_dointvec,
95c385b4
NH		 4933
4934 },
7bc570c8
YH		 4935#endif
4936#ifdef CONFIG_IPV6_MROUTE
4937 {
e21e8467
SH		 4938 .procname = "mc_forwarding",
4939 .data = &ipv6_devconf.mc_forwarding,
4940 .maxlen = sizeof(int),
4941 .mode = 0444,
4942 .proc_handler = proc_dointvec,
7bc570c8 4943 },
95c385b4 4944#endif
778d80be 4945 {
e21e8467
SH		 4946 .procname = "disable_ipv6",
4947 .data = &ipv6_devconf.disable_ipv6,
4948 .maxlen = sizeof(int),
4949 .mode = 0644,
4950 .proc_handler = addrconf_sysctl_disable,
778d80be 4951 },
1b34be74 4952 {
e21e8467
SH		 4953 .procname = "accept_dad",
4954 .data = &ipv6_devconf.accept_dad,
4955 .maxlen = sizeof(int),
4956 .mode = 0644,
4957 .proc_handler = proc_dointvec,
1b34be74 4958 },
f7734fdf 4959 {
f7734fdf
OP		 4960 .procname = "force_tllao",
4961 .data = &ipv6_devconf.force_tllao,
4962 .maxlen = sizeof(int),
4963 .mode = 0644,
4964 .proc_handler = proc_dointvec
4965 },
5cb04436
HFS		 4966 {
4967 .procname = "ndisc_notify",
4968 .data = &ipv6_devconf.ndisc_notify,
4969 .maxlen = sizeof(int),
4970 .mode = 0644,
4971 .proc_handler = proc_dointvec
4972 },
b800c3b9
HFS		 4973 {
4974 .procname = "suppress_frag_ndisc",
4975 .data = &ipv6_devconf.suppress_frag_ndisc,
4976 .maxlen = sizeof(int),
4977 .mode = 0644,
4978 .proc_handler = proc_dointvec
4979 },
1da177e4 4980 {
f8572d8f 4981 /* sentinel */
1da177e4
LT		 4982 }
4983 },
1da177e4
LT		 4984};
4985
bff16c2f 4986static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4987 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4988{
4989 int i;
1da177e4 4990 struct addrconf_sysctl_table *t;
6105e293 4991 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 4992
af879cc7 4993 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4994 if (t == NULL)
f68635e6
PE		 4995 goto out;
4996
bcdd553f 4997 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 4998 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 4999 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 5000 t->addrconf_vars[i].extra2 = net;
1da177e4 5001 }
1da177e4 5002
6105e293 5003 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 5004
6105e293 5005 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
1da177e4 5006 if (t->sysctl_header == NULL)
6105e293 5007 goto free;
f68635e6
PE		 5008
5009 p->sysctl = t;
95897312 5010 return 0;
1da177e4 5011
f68635e6 5012free:
1da177e4 5013 kfree(t);
f68635e6 5014out:
95897312 5015 return -ENOBUFS;
1da177e4
LT		 5016}
5017
408c4768
PE		 5018static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5019{
5020 struct addrconf_sysctl_table *t;
5021
5022 if (p->sysctl == NULL)
5023 return;
5024
5025 t = p->sysctl;
5026 p->sysctl = NULL;
ff538818 5027 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 5028 kfree(t);
5029}
5030
f52295a9
PE		 5031static void addrconf_sysctl_register(struct inet6_dev *idev)
5032{
73af614a 5033 neigh_sysctl_register(idev->dev, idev->nd_parms,
f8572d8f 5034 &ndisc_ifinfo_sysctl_change);
c346dca1 5035 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 5036 idev, &idev->cnf);
f52295a9
PE		 5037}
5038
408c4768 5039static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 5040{
408c4768
PE		 5041 __addrconf_sysctl_unregister(&idev->cnf);
5042 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 5043}
5044
5045
5046#endif
5047
2c8c1e72 5048static int __net_init addrconf_init_net(struct net *net)
e0da5a48 5049{
a79ca223 5050 int err = -ENOMEM;
e0da5a48
PE		 5051 struct ipv6_devconf *all, *dflt;
5052
a79ca223
HZ		 5053 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5054 if (all == NULL)
5055 goto err_alloc_all;
e0da5a48 5056
a79ca223
HZ		 5057 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5058 if (dflt == NULL)
5059 goto err_alloc_dflt;
e0da5a48 5060
a79ca223
HZ		 5061 /* these will be inherited by all namespaces */
5062 dflt->autoconf = ipv6_defaults.autoconf;
5063 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 5064
5065 net->ipv6.devconf_all = all;
5066 net->ipv6.devconf_dflt = dflt;
5067
5068#ifdef CONFIG_SYSCTL
f8572d8f 5069 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 5070 if (err < 0)
5071 goto err_reg_all;
5072
f8572d8f 5073 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 5074 if (err < 0)
5075 goto err_reg_dflt;
5076#endif
5077 return 0;
5078
5079#ifdef CONFIG_SYSCTL
5080err_reg_dflt:
5081 __addrconf_sysctl_unregister(all);
5082err_reg_all:
5083 kfree(dflt);
5084#endif
5085err_alloc_dflt:
5086 kfree(all);
5087err_alloc_all:
5088 return err;
5089}
5090
2c8c1e72 5091static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 5092{
5093#ifdef CONFIG_SYSCTL
5094 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5095 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5096#endif
09ad9bc7 5097 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 5098 kfree(net->ipv6.devconf_dflt);
5099 kfree(net->ipv6.devconf_all);
5100 }
5101}
5102
5103static struct pernet_operations addrconf_ops = {
5104 .init = addrconf_init_net,
5105 .exit = addrconf_exit_net,
5106};
5107
b382b191
TG		 5108static struct rtnl_af_ops inet6_ops = {
5109 .family = AF_INET6,
5110 .fill_link_af = inet6_fill_link_af,
5111 .get_link_af_size = inet6_get_link_af_size,
f53adae4 5112 .set_link_af = inet6_set_link_af,
b382b191
TG		 5113};
5114
1da177e4
LT		 5115/*
5116 * Init / cleanup code
5117 */
5118
5119int __init addrconf_init(void)
5120{
c2e21293 5121 int i, err;
2a8cc6c8 5122
e21e8467
SH		 5123 err = ipv6_addr_label_init();
5124 if (err < 0) {
f3213831
JP		 5125 pr_crit("%s: cannot initialize default policy table: %d\n",
5126 __func__, err);
2cc6d2bf 5127 goto out;
2a8cc6c8 5128 }
1da177e4 5129
2cc6d2bf
NH		 5130 err = register_pernet_subsys(&addrconf_ops);
5131 if (err < 0)
5132 goto out_addrlabel;
e0da5a48 5133
1da177e4
LT		 5134 /* The addrconf netdev notifier requires that loopback_dev
5135 * has it's ipv6 private information allocated and setup
5136 * before it can bring up and give link-local addresses
5137 * to other devices which are up.
5138 *
5139 * Unfortunately, loopback_dev is not necessarily the first
5140 * entry in the global dev_base list of net devices. In fact,
5141 * it is likely to be the very last entry on that list.
5142 * So this causes the notifier registry below to try and
5143 * give link-local addresses to all devices besides loopback_dev
5144 * first, then loopback_dev, which cases all the non-loopback_dev
5145 * devices to fail to get a link-local address.
5146 *
5147 * So, as a temporary fix, allocate the ipv6 structure for
5148 * loopback_dev first by hand.
5149 * Longer term, all of the dependencies ipv6 has upon the loopback
5150 * device and it being up should be removed.
5151 */
5152 rtnl_lock();
2774c7ab 5153 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 5154 err = -ENOMEM;
5155 rtnl_unlock();
5156 if (err)
e0da5a48 5157 goto errlo;
1da177e4 5158
c2e21293 5159 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5160 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5161
1da177e4
LT		 5162 register_netdevice_notifier(&ipv6_dev_notf);
5163
1da177e4 5164 addrconf_verify(0);
c127ea2c 5165
b382b191
TG		 5166 err = rtnl_af_register(&inet6_ops);
5167 if (err < 0)
5168 goto errout_af;
5169
c7ac8679
GR		 5170 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5171 NULL);
c127ea2c
TG		 5172 if (err < 0)
5173 goto errout;
5174
5175 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 5176 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5177 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5178 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5179 inet6_dump_ifaddr, NULL);
5180 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5181 inet6_dump_ifmcaddr, NULL);
5182 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5183 inet6_dump_ifacaddr, NULL);
76f8f6cb 5184 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 5185 inet6_netconf_dump_devconf, NULL);
c127ea2c 5186
2a8cc6c8
YH		 5187 ipv6_addr_label_rtnl_register();
5188
1da177e4 5189 return 0;
c127ea2c 5190errout:
b382b191
TG		 5191 rtnl_af_unregister(&inet6_ops);
5192errout_af:
c127ea2c 5193 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 5194errlo:
5195 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 5196out_addrlabel:
5197 ipv6_addr_label_cleanup();
5198out:
c127ea2c 5199 return err;
1da177e4
LT		 5200}
5201
09f7709f 5202void addrconf_cleanup(void)
1da177e4 5203{
176c39af 5204 struct net_device *dev;
1da177e4
LT		 5205 int i;
5206
5207 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5208 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 5209 ipv6_addr_label_cleanup();
1da177e4
LT		 5210
5211 rtnl_lock();
5212
b382b191
TG		 5213 __rtnl_af_unregister(&inet6_ops);
5214
176c39af
DL		 5215 /* clean dev list */
5216 for_each_netdev(&init_net, dev) {
5217 if (__in6_dev_get(dev) == NULL)
5218 continue;
5219 addrconf_ifdown(dev, 1);
5220 }
5221 addrconf_ifdown(init_net.loopback_dev, 2);
5222
1da177e4
LT		 5223 /*
5224 * Check hash table.
5225 */
5c578aed 5226 spin_lock_bh(&addrconf_hash_lock);
c2e21293 5227 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5228 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 5229 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 5230
5231 del_timer(&addr_chk_timer);
1da177e4 5232 rtnl_unlock();
1da177e4 5233}
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