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net: clean up snmp stats code
[deliverable/linux.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
1da177e4
LT		 46#include <linux/socket.h>
47#include <linux/sockios.h>
1da177e4
LT		 48#include <linux/net.h>
49#include <linux/in6.h>
50#include <linux/netdevice.h>
1823730f 51#include <linux/if_addr.h>
1da177e4
LT		 52#include <linux/if_arp.h>
53#include <linux/if_arcnet.h>
54#include <linux/if_infiniband.h>
55#include <linux/route.h>
56#include <linux/inetdevice.h>
57#include <linux/init.h>
5a0e3ad6 58#include <linux/slab.h>
1da177e4
LT		 59#ifdef CONFIG_SYSCTL
60#include <linux/sysctl.h>
61#endif
4fc268d2 62#include <linux/capability.h>
1da177e4
LT		 63#include <linux/delay.h>
64#include <linux/notifier.h>
543537bd 65#include <linux/string.h>
ddbe5032 66#include <linux/hash.h>
1da177e4 67
457c4cbc 68#include <net/net_namespace.h>
1da177e4
LT		 69#include <net/sock.h>
70#include <net/snmp.h>
71
06a4c1c5 72#include <net/af_ieee802154.h>
cb6bf355 73#include <net/firewire.h>
1da177e4
LT		 74#include <net/ipv6.h>
75#include <net/protocol.h>
76#include <net/ndisc.h>
77#include <net/ip6_route.h>
78#include <net/addrconf.h>
79#include <net/tcp.h>
80#include <net/ip.h>
5d620266 81#include <net/netlink.h>
f24e3d65 82#include <net/pkt_sched.h>
1da177e4
LT		 83#include <linux/if_tunnel.h>
84#include <linux/rtnetlink.h>
f3a1bfb1 85#include <linux/netconf.h>
1da177e4 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
c15b1cca
HFS		 136static void addrconf_verify(void);
137static void addrconf_verify_rtnl(void);
138static void addrconf_verify_work(struct work_struct *);
1da177e4 139
c15b1cca
HFS		 140static struct workqueue_struct *addrconf_wq;
141static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 142
143static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
144static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
145
93d9b7d7
JP		 146static void addrconf_type_change(struct net_device *dev,
147 unsigned long event);
1da177e4
LT		 148static int addrconf_ifdown(struct net_device *dev, int how);
149
21caa662
RK		 150static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
151 int plen,
152 const struct net_device *dev,
153 u32 flags, u32 noflags);
154
cf22f9a2 155static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 156static void addrconf_dad_work(struct work_struct *w);
1da177e4 157static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 158static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 159static void addrconf_rs_timer(unsigned long data);
160static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
161static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
162
1ab1457c 163static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 164 struct prefix_info *pinfo);
3e81c6da
DM		 165static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
166 struct net_device *dev);
1da177e4 167
888c848e 168static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 169 .forwarding = 0,
170 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
171 .mtu6 = IPV6_MIN_MTU,
172 .accept_ra = 1,
173 .accept_redirects = 1,
174 .autoconf = 1,
175 .force_mld_version = 0,
fc4eba58
HFS		 176 .mldv1_unsolicited_report_interval = 10 * HZ,
177 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 178 .dad_transmits = 1,
179 .rtr_solicits = MAX_RTR_SOLICITATIONS,
180 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
181 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 182 .use_tempaddr = 0,
183 .temp_valid_lft = TEMP_VALID_LIFETIME,
184 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
185 .regen_max_retry = REGEN_MAX_RETRY,
186 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 187 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 188 .accept_ra_defrtr = 1,
c4fd30eb 189 .accept_ra_pinfo = 1,
930d6ff2
YH		 190#ifdef CONFIG_IPV6_ROUTER_PREF
191 .accept_ra_rtr_pref = 1,
52e16356 192 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 193#ifdef CONFIG_IPV6_ROUTE_INFO
194 .accept_ra_rt_info_max_plen = 0,
195#endif
930d6ff2 196#endif
fbea49e1 197 .proxy_ndp = 0,
0bcbc926 198 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 199 .disable_ipv6 = 0,
1b34be74 200 .accept_dad = 1,
b800c3b9 201 .suppress_frag_ndisc = 1,
1da177e4
LT		 202};
203
ab32ea5d 204static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 205 .forwarding = 0,
206 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
207 .mtu6 = IPV6_MIN_MTU,
208 .accept_ra = 1,
209 .accept_redirects = 1,
210 .autoconf = 1,
fc4eba58
HFS		 211 .force_mld_version = 0,
212 .mldv1_unsolicited_report_interval = 10 * HZ,
213 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 214 .dad_transmits = 1,
215 .rtr_solicits = MAX_RTR_SOLICITATIONS,
216 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
217 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 218 .use_tempaddr = 0,
219 .temp_valid_lft = TEMP_VALID_LIFETIME,
220 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
221 .regen_max_retry = REGEN_MAX_RETRY,
222 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 223 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 224 .accept_ra_defrtr = 1,
c4fd30eb 225 .accept_ra_pinfo = 1,
930d6ff2
YH		 226#ifdef CONFIG_IPV6_ROUTER_PREF
227 .accept_ra_rtr_pref = 1,
52e16356 228 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 229#ifdef CONFIG_IPV6_ROUTE_INFO
230 .accept_ra_rt_info_max_plen = 0,
231#endif
930d6ff2 232#endif
fbea49e1 233 .proxy_ndp = 0,
0bcbc926 234 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 235 .disable_ipv6 = 0,
1b34be74 236 .accept_dad = 1,
b800c3b9 237 .suppress_frag_ndisc = 1,
1da177e4
LT		 238};
239
f24e3d65 240/* Check if a valid qdisc is available */
05297949 241static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 242{
05297949 243 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 244}
245
b7b1bfce 246static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 247{
b7b1bfce
HFS		 248 if (del_timer(&idev->rs_timer))
249 __in6_dev_put(idev);
250}
251
c15b1cca 252static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 253{
c15b1cca 254 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 255 __in6_ifa_put(ifp);
256}
257
b7b1bfce
HFS		 258static void addrconf_mod_rs_timer(struct inet6_dev *idev,
259 unsigned long when)
260{
261 if (!timer_pending(&idev->rs_timer))
262 in6_dev_hold(idev);
263 mod_timer(&idev->rs_timer, jiffies + when);
264}
1da177e4 265
c15b1cca
HFS		 266static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
267 unsigned long delay)
1da177e4 268{
c15b1cca 269 if (!delayed_work_pending(&ifp->dad_work))
1da177e4 270 in6_ifa_hold(ifp);
c15b1cca 271 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
1da177e4
LT		 272}
273
7f7d9a6b
HX		 274static int snmp6_alloc_dev(struct inet6_dev *idev)
275{
827da44c
JS		 276 int i;
277
698365fa
WC		 278 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
279 if (!idev->stats.ipv6)
7f7d9a6b 280 goto err_ip;
827da44c
JS		 281
282 for_each_possible_cpu(i) {
283 struct ipstats_mib *addrconf_stats;
698365fa 284 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 285 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 286 }
287
288
be281e55
ED		 289 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
290 GFP_KERNEL);
291 if (!idev->stats.icmpv6dev)
7f7d9a6b 292 goto err_icmp;
be281e55
ED		 293 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
294 GFP_KERNEL);
295 if (!idev->stats.icmpv6msgdev)
14878f75 296 goto err_icmpmsg;
7f7d9a6b
HX		 297
298 return 0;
299
14878f75 300err_icmpmsg:
be281e55 301 kfree(idev->stats.icmpv6dev);
7f7d9a6b 302err_icmp:
698365fa 303 free_percpu(idev->stats.ipv6);
7f7d9a6b 304err_ip:
aaf70ec7 305 return -ENOMEM;
7f7d9a6b
HX		 306}
307
8e5e8f30 308static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 309{
310 struct inet6_dev *ndev;
311
312 ASSERT_RTNL();
313
314 if (dev->mtu < IPV6_MIN_MTU)
315 return NULL;
316
1ab1457c 317 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 318
1ab1457c
YH		 319 if (ndev == NULL)
320 return NULL;
322f74a4
IO		 321
322 rwlock_init(&ndev->lock);
323 ndev->dev = dev;
502a2ffd 324 INIT_LIST_HEAD(&ndev->addr_list);
b7b1bfce
HFS		 325 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
326 (unsigned long)ndev);
c346dca1 327 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 328 ndev->cnf.mtu6 = dev->mtu;
329 ndev->cnf.sysctl = NULL;
330 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
331 if (ndev->nd_parms == NULL) {
332 kfree(ndev);
333 return NULL;
334 }
0187bdfb
BH		 335 if (ndev->cnf.forwarding)
336 dev_disable_lro(dev);
322f74a4
IO		 337 /* We refer to the device */
338 dev_hold(dev);
1da177e4 339
322f74a4 340 if (snmp6_alloc_dev(ndev) < 0) {
ba3542e1 341 ADBG(KERN_WARNING
f3213831 342 "%s: cannot allocate memory for statistics; dev=%s.\n",
ba3542e1 343 __func__, dev->name);
322f74a4 344 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 345 dev_put(dev);
346 kfree(ndev);
322f74a4
IO		 347 return NULL;
348 }
1da177e4 349
322f74a4 350 if (snmp6_register_dev(ndev) < 0) {
ba3542e1 351 ADBG(KERN_WARNING
f3213831 352 "%s: cannot create /proc/net/dev_snmp6/%s\n",
ba3542e1 353 __func__, dev->name);
322f74a4
IO		 354 neigh_parms_release(&nd_tbl, ndev->nd_parms);
355 ndev->dead = 1;
356 in6_dev_finish_destroy(ndev);
357 return NULL;
358 }
359
360 /* One reference from device. We must do this before
361 * we invoke __ipv6_regen_rndid().
362 */
363 in6_dev_hold(ndev);
1da177e4 364
1b34be74
YH		 365 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
366 ndev->cnf.accept_dad = -1;
367
07a93626 368#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 369 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 370 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 371 ndev->cnf.rtr_solicits = 0;
372 }
373#endif
374
372e6c8f 375 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 376 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 377 if ((dev->flags&IFF_LOOPBACK) ||
378 dev->type == ARPHRD_TUNNEL ||
9625ed72 379 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 380 dev->type == ARPHRD_SIT ||
0be669bb 381 dev->type == ARPHRD_NONE) {
322f74a4
IO		 382 ndev->cnf.use_tempaddr = -1;
383 } else {
384 in6_dev_hold(ndev);
385 ipv6_regen_rndid((unsigned long) ndev);
386 }
5d9efa7e 387
914faa14 388 ndev->token = in6addr_any;
1da177e4 389
f24e3d65 390 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 391 ndev->if_flags |= IF_READY;
392
322f74a4
IO		 393 ipv6_mc_init_dev(ndev);
394 ndev->tstamp = jiffies;
f52295a9 395 addrconf_sysctl_register(ndev);
30c4cf57 396 /* protected by rtnl_lock */
cf778b00 397 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 398
2c5e8933
HFS		 399 /* Join interface-local all-node multicast group */
400 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
401
d88ae4cc 402 /* Join all-node multicast group */
f3ee4010 403 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 404
d6ddef9e 405 /* Join all-router multicast group if forwarding is set */
8b2aaede 406 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 407 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
408
1da177e4
LT		 409 return ndev;
410}
411
8e5e8f30 412static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 413{
414 struct inet6_dev *idev;
415
416 ASSERT_RTNL();
417
e21e8467
SH		 418 idev = __in6_dev_get(dev);
419 if (!idev) {
420 idev = ipv6_add_dev(dev);
421 if (!idev)
1da177e4
LT		 422 return NULL;
423 }
c5e33bdd 424
1da177e4
LT		 425 if (dev->flags&IFF_UP)
426 ipv6_mc_up(idev);
427 return idev;
428}
429
f3a1bfb1
ND		 430static int inet6_netconf_msgsize_devconf(int type)
431{
432 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
433 + nla_total_size(4); /* NETCONFA_IFINDEX */
434
76f8f6cb
ND		 435 /* type -1 is used for ALL */
436 if (type == -1 || type == NETCONFA_FORWARDING)
f3a1bfb1 437 size += nla_total_size(4);
b1afce95 438#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 439 if (type == -1 || type == NETCONFA_MC_FORWARDING)
440 size += nla_total_size(4);
b1afce95 441#endif
c92d5491 442 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
443 size += nla_total_size(4);
f3a1bfb1
ND		 444
445 return size;
446}
447
448static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
449 struct ipv6_devconf *devconf, u32 portid,
450 u32 seq, int event, unsigned int flags,
451 int type)
452{
453 struct nlmsghdr *nlh;
454 struct netconfmsg *ncm;
455
456 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
457 flags);
458 if (nlh == NULL)
459 return -EMSGSIZE;
460
461 ncm = nlmsg_data(nlh);
462 ncm->ncm_family = AF_INET6;
463
464 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
465 goto nla_put_failure;
466
76f8f6cb
ND		 467 /* type -1 is used for ALL */
468 if ((type == -1 || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 469 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
470 goto nla_put_failure;
b1afce95 471#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 472 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
473 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
474 devconf->mc_forwarding) < 0)
475 goto nla_put_failure;
b1afce95 476#endif
c92d5491 477 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
478 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
479 goto nla_put_failure;
480
f3a1bfb1
ND		 481 return nlmsg_end(skb, nlh);
482
483nla_put_failure:
484 nlmsg_cancel(skb, nlh);
485 return -EMSGSIZE;
486}
487
d67b8c61
ND		 488void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
489 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 490{
491 struct sk_buff *skb;
492 int err = -ENOBUFS;
493
494 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
495 if (skb == NULL)
496 goto errout;
497
498 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
499 RTM_NEWNETCONF, 0, type);
500 if (err < 0) {
501 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
502 WARN_ON(err == -EMSGSIZE);
503 kfree_skb(skb);
504 goto errout;
505 }
506 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
507 return;
508errout:
bd779028 509 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 510}
511
76f8f6cb
ND		 512static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
513 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
514 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 515 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
76f8f6cb
ND		 516};
517
518static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 519 struct nlmsghdr *nlh)
76f8f6cb
ND		 520{
521 struct net *net = sock_net(in_skb->sk);
522 struct nlattr *tb[NETCONFA_MAX+1];
523 struct netconfmsg *ncm;
524 struct sk_buff *skb;
525 struct ipv6_devconf *devconf;
526 struct inet6_dev *in6_dev;
527 struct net_device *dev;
528 int ifindex;
529 int err;
530
531 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
532 devconf_ipv6_policy);
533 if (err < 0)
534 goto errout;
535
536 err = EINVAL;
537 if (!tb[NETCONFA_IFINDEX])
538 goto errout;
539
540 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
541 switch (ifindex) {
542 case NETCONFA_IFINDEX_ALL:
543 devconf = net->ipv6.devconf_all;
544 break;
545 case NETCONFA_IFINDEX_DEFAULT:
546 devconf = net->ipv6.devconf_dflt;
547 break;
548 default:
549 dev = __dev_get_by_index(net, ifindex);
550 if (dev == NULL)
551 goto errout;
552 in6_dev = __in6_dev_get(dev);
553 if (in6_dev == NULL)
554 goto errout;
555 devconf = &in6_dev->cnf;
556 break;
557 }
558
559 err = -ENOBUFS;
560 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
561 if (skb == NULL)
562 goto errout;
563
564 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
565 NETLINK_CB(in_skb).portid,
566 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
567 -1);
568 if (err < 0) {
569 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
570 WARN_ON(err == -EMSGSIZE);
571 kfree_skb(skb);
572 goto errout;
573 }
574 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
575errout:
576 return err;
577}
578
7a674200
ND		 579static int inet6_netconf_dump_devconf(struct sk_buff *skb,
580 struct netlink_callback *cb)
581{
582 struct net *net = sock_net(skb->sk);
583 int h, s_h;
584 int idx, s_idx;
585 struct net_device *dev;
586 struct inet6_dev *idev;
587 struct hlist_head *head;
588
589 s_h = cb->args[0];
590 s_idx = idx = cb->args[1];
591
592 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
593 idx = 0;
594 head = &net->dev_index_head[h];
595 rcu_read_lock();
63998ac2
ND		 596 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
597 net->dev_base_seq;
7a674200
ND		 598 hlist_for_each_entry_rcu(dev, head, index_hlist) {
599 if (idx < s_idx)
600 goto cont;
601 idev = __in6_dev_get(dev);
602 if (!idev)
603 goto cont;
604
605 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
606 &idev->cnf,
607 NETLINK_CB(cb->skb).portid,
608 cb->nlh->nlmsg_seq,
609 RTM_NEWNETCONF,
610 NLM_F_MULTI,
611 -1) <= 0) {
612 rcu_read_unlock();
613 goto done;
614 }
63998ac2 615 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 616cont:
617 idx++;
618 }
619 rcu_read_unlock();
620 }
621 if (h == NETDEV_HASHENTRIES) {
622 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
623 net->ipv6.devconf_all,
624 NETLINK_CB(cb->skb).portid,
625 cb->nlh->nlmsg_seq,
626 RTM_NEWNETCONF, NLM_F_MULTI,
627 -1) <= 0)
628 goto done;
629 else
630 h++;
631 }
632 if (h == NETDEV_HASHENTRIES + 1) {
633 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
634 net->ipv6.devconf_dflt,
635 NETLINK_CB(cb->skb).portid,
636 cb->nlh->nlmsg_seq,
637 RTM_NEWNETCONF, NLM_F_MULTI,
638 -1) <= 0)
639 goto done;
640 else
641 h++;
642 }
643done:
644 cb->args[0] = h;
645 cb->args[1] = idx;
646
647 return skb->len;
648}
649
1da177e4
LT		 650#ifdef CONFIG_SYSCTL
651static void dev_forward_change(struct inet6_dev *idev)
652{
653 struct net_device *dev;
654 struct inet6_ifaddr *ifa;
1da177e4
LT		 655
656 if (!idev)
657 return;
658 dev = idev->dev;
0187bdfb
BH		 659 if (idev->cnf.forwarding)
660 dev_disable_lro(dev);
1a940835 661 if (dev->flags & IFF_MULTICAST) {
2c5e8933 662 if (idev->cnf.forwarding) {
f3ee4010 663 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 664 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
665 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
666 } else {
f3ee4010 667 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 668 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
669 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
670 }
1da177e4 671 }
502a2ffd 672
673 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 674 if (ifa->flags&IFA_F_TENTATIVE)
675 continue;
1da177e4
LT		 676 if (idev->cnf.forwarding)
677 addrconf_join_anycast(ifa);
678 else
679 addrconf_leave_anycast(ifa);
680 }
f3a1bfb1
ND		 681 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
682 dev->ifindex, &idev->cnf);
1da177e4
LT		 683}
684
685
e186932b 686static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 687{
688 struct net_device *dev;
689 struct inet6_dev *idev;
690
4acd4945 691 for_each_netdev(net, dev) {
1da177e4
LT		 692 idev = __in6_dev_get(dev);
693 if (idev) {
e186932b
PE		 694 int changed = (!idev->cnf.forwarding) ^ (!newf);
695 idev->cnf.forwarding = newf;
1da177e4
LT		 696 if (changed)
697 dev_forward_change(idev);
698 }
1da177e4 699 }
1da177e4 700}
c8fecf22 701
013d97e9 702static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 703{
bff16c2f 704 struct net *net;
013d97e9
FR		 705 int old;
706
707 if (!rtnl_trylock())
708 return restart_syscall();
bff16c2f
PE		 709
710 net = (struct net *)table->extra2;
013d97e9
FR		 711 old = *p;
712 *p = newf;
b325fddb 713
013d97e9 714 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 715 if ((!newf) ^ (!old))
716 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
717 NETCONFA_IFINDEX_DEFAULT,
718 net->ipv6.devconf_dflt);
013d97e9
FR		 719 rtnl_unlock();
720 return 0;
88af182e 721 }
c8fecf22 722
e186932b 723 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 724 net->ipv6.devconf_dflt->forwarding = newf;
725 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 726 if ((!newf) ^ (!old))
727 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
728 NETCONFA_IFINDEX_ALL,
729 net->ipv6.devconf_all);
013d97e9 730 } else if ((!newf) ^ (!old))
c8fecf22 731 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 732 rtnl_unlock();
c8fecf22 733
013d97e9 734 if (newf)
7b4da532 735 rt6_purge_dflt_routers(net);
b325fddb 736 return 1;
c8fecf22 737}
1da177e4
LT		 738#endif
739
5c578aed 740/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 741void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
742{
c2e21293 743 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 744
1da177e4 745#ifdef NET_REFCNT_DEBUG
91df42be 746 pr_debug("%s\n", __func__);
1da177e4
LT		 747#endif
748
749 in6_dev_put(ifp->idev);
750
c15b1cca
HFS		 751 if (cancel_delayed_work(&ifp->dad_work))
752 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
753 ifp);
1da177e4 754
e9d3e084 755 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 756 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 757 return;
758 }
94e187c0 759 ip6_rt_put(ifp->rt);
1da177e4 760
e5785985 761 kfree_rcu(ifp, rcu);
1da177e4
LT		 762}
763
e55ffac6
BH		 764static void
765ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
766{
502a2ffd 767 struct list_head *p;
8a6ce0c0 768 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 769
770 /*
771 * Each device address list is sorted in order of scope -
772 * global before linklocal.
773 */
502a2ffd 774 list_for_each(p, &idev->addr_list) {
775 struct inet6_ifaddr *ifa
776 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 777 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 778 break;
779 }
780
b54c9b98 781 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 782}
783
ddbe5032 784static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 785{
ddbe5032 786 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 787}
788
1da177e4
LT		 789/* On success it returns ifp with increased reference count */
790
791static struct inet6_ifaddr *
3f8f5298
JP		 792ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
793 const struct in6_addr *peer_addr, int pfxlen,
8a226b2c 794 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
1da177e4
LT		 795{
796 struct inet6_ifaddr *ifa = NULL;
797 struct rt6_info *rt;
3a88a81d 798 unsigned int hash;
1da177e4 799 int err = 0;
d68b8270
YH		 800 int addr_type = ipv6_addr_type(addr);
801
802 if (addr_type == IPV6_ADDR_ANY ||
803 addr_type & IPV6_ADDR_MULTICAST ||
804 (!(idev->dev->flags & IFF_LOOPBACK) &&
805 addr_type & IPV6_ADDR_LOOPBACK))
806 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 807
8814c4b5 808 rcu_read_lock_bh();
1da177e4
LT		 809 if (idev->dead) {
810 err = -ENODEV; /*XXX*/
811 goto out2;
812 }
813
56d417b1 814 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 815 err = -EACCES;
816 goto out2;
817 }
818
5c578aed 819 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 820
821 /* Ignore adding duplicate addresses on an interface */
c346dca1 822 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ba3542e1 823 ADBG("ipv6_add_addr: already assigned\n");
1da177e4
LT		 824 err = -EEXIST;
825 goto out;
826 }
827
322f74a4 828 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 829
830 if (ifa == NULL) {
ba3542e1 831 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 832 err = -ENOBUFS;
833 goto out;
834 }
835
8f031519 836 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 837 if (IS_ERR(rt)) {
838 err = PTR_ERR(rt);
839 goto out;
840 }
841
bba24896
JP		 842 neigh_parms_data_state_setall(idev->nd_parms);
843
4e3fd7a0 844 ifa->addr = *addr;
3f8f5298
JP		 845 if (peer_addr)
846 ifa->peer_addr = *peer_addr;
1da177e4
LT		 847
848 spin_lock_init(&ifa->lock);
e9d3e084 849 spin_lock_init(&ifa->state_lock);
c15b1cca 850 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 851 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 852 ifa->scope = scope;
853 ifa->prefix_len = pfxlen;
854 ifa->flags = flags | IFA_F_TENTATIVE;
8a226b2c
JB		 855 ifa->valid_lft = valid_lft;
856 ifa->prefered_lft = prefered_lft;
1da177e4 857 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 858 ifa->tokenized = false;
1da177e4 859
57f5f544
KF		 860 ifa->rt = rt;
861
1da177e4
LT		 862 ifa->idev = idev;
863 in6_dev_hold(idev);
864 /* For caller */
865 in6_ifa_hold(ifa);
866
867 /* Add to big hash table */
ddbe5032 868 hash = inet6_addr_hash(addr);
1da177e4 869
5c578aed 870 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 871 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 872
873 write_lock(&idev->lock);
874 /* Add to inet6_dev unicast addr list. */
e55ffac6 875 ipv6_link_dev_addr(idev, ifa);
1da177e4 876
1da177e4 877 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 878 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 879 in6_ifa_hold(ifa);
880 }
1da177e4 881
1da177e4
LT		 882 in6_ifa_hold(ifa);
883 write_unlock(&idev->lock);
884out2:
8814c4b5 885 rcu_read_unlock_bh();
1da177e4 886
fd92833a 887 if (likely(err == 0))
f88c91dd 888 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 889 else {
890 kfree(ifa);
891 ifa = ERR_PTR(err);
892 }
893
894 return ifa;
895out:
5c578aed 896 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 897 goto out2;
898}
899
5b84efec
TH		 900enum cleanup_prefix_rt_t {
901 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
902 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
903 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
904};
905
906/*
907 * Check, whether the prefix for ifp would still need a prefix route
908 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
909 * constants.
910 *
911 * 1) we don't purge prefix if address was not permanent.
912 * prefix is managed by its own lifetime.
913 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
914 * 3) if there are no addresses, delete prefix.
915 * 4) if there are still other permanent address(es),
916 * corresponding prefix is still permanent.
917 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
918 * don't purge the prefix, assume user space is managing it.
919 * 6) otherwise, update prefix lifetime to the
920 * longest valid lifetime among the corresponding
921 * addresses on the device.
922 * Note: subsequent RA will update lifetime.
923 **/
924static enum cleanup_prefix_rt_t
925check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
926{
927 struct inet6_ifaddr *ifa;
928 struct inet6_dev *idev = ifp->idev;
929 unsigned long lifetime;
930 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
931
932 *expires = jiffies;
933
934 list_for_each_entry(ifa, &idev->addr_list, if_list) {
935 if (ifa == ifp)
936 continue;
937 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
938 ifp->prefix_len))
939 continue;
940 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
941 return CLEANUP_PREFIX_RT_NOP;
942
943 action = CLEANUP_PREFIX_RT_EXPIRE;
944
945 spin_lock(&ifa->lock);
946
947 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
948 /*
949 * Note: Because this address is
950 * not permanent, lifetime <
951 * LONG_MAX / HZ here.
952 */
953 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
954 *expires = ifa->tstamp + lifetime * HZ;
955 spin_unlock(&ifa->lock);
956 }
957
958 return action;
959}
960
961static void
962cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
963{
964 struct rt6_info *rt;
965
966 rt = addrconf_get_prefix_route(&ifp->addr,
967 ifp->prefix_len,
968 ifp->idev->dev,
969 0, RTF_GATEWAY | RTF_DEFAULT);
970 if (rt) {
971 if (del_rt)
972 ip6_del_rt(rt);
973 else {
974 if (!(rt->rt6i_flags & RTF_EXPIRES))
975 rt6_set_expires(rt, expires);
976 ip6_rt_put(rt);
977 }
978 }
979}
980
981
1da177e4
LT		 982/* This function wants to get referenced ifp and releases it before return */
983
984static void ipv6_del_addr(struct inet6_ifaddr *ifp)
985{
4c5ff6a6 986 int state;
5b84efec
TH		 987 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
988 unsigned long expires;
1da177e4 989
c15b1cca
HFS		 990 ASSERT_RTNL();
991
4c5ff6a6
HX		 992 spin_lock_bh(&ifp->state_lock);
993 state = ifp->state;
e9d3e084 994 ifp->state = INET6_IFADDR_STATE_DEAD;
4c5ff6a6
HX		 995 spin_unlock_bh(&ifp->state_lock);
996
997 if (state == INET6_IFADDR_STATE_DEAD)
998 goto out;
1da177e4 999
5c578aed 1000 spin_lock_bh(&addrconf_hash_lock);
1001 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1002 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1003
5b84efec 1004 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1005
1da177e4 1006 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1007 list_del(&ifp->tmp_list);
1008 if (ifp->ifpub) {
1009 in6_ifa_put(ifp->ifpub);
1010 ifp->ifpub = NULL;
1da177e4 1011 }
372e6c8f 1012 __in6_ifa_put(ifp);
1da177e4 1013 }
1da177e4 1014
5b84efec
TH		 1015 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1016 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1017
5b84efec
TH		 1018 list_del_init(&ifp->if_list);
1019 __in6_ifa_put(ifp);
1020
1021 write_unlock_bh(&ifp->idev->lock);
1da177e4 1022
c15b1cca 1023 addrconf_del_dad_work(ifp);
b2238566 1024
1da177e4
LT		 1025 ipv6_ifa_notify(RTM_DELADDR, ifp);
1026
f88c91dd 1027 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1028
5b84efec
TH		 1029 if (action != CLEANUP_PREFIX_RT_NOP) {
1030 cleanup_prefix_route(ifp, expires,
1031 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1032 }
1033
c3968a85
DW		 1034 /* clean up prefsrc entries */
1035 rt6_remove_prefsrc(ifp);
4c5ff6a6 1036out:
1da177e4
LT		 1037 in6_ifa_put(ifp);
1038}
1039
1da177e4
LT		 1040static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1041{
1042 struct inet6_dev *idev = ifp->idev;
1043 struct in6_addr addr, *tmpaddr;
76f793e3 1044 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1045 unsigned long regen_advance;
1da177e4
LT		 1046 int tmp_plen;
1047 int ret = 0;
95c385b4 1048 u32 addr_flags;
76f793e3 1049 unsigned long now = jiffies;
1da177e4 1050
53bd6749 1051 write_lock_bh(&idev->lock);
1da177e4
LT		 1052 if (ift) {
1053 spin_lock_bh(&ift->lock);
1054 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1055 spin_unlock_bh(&ift->lock);
1056 tmpaddr = &addr;
1057 } else {
1058 tmpaddr = NULL;
1059 }
1060retry:
1061 in6_dev_hold(idev);
1062 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1063 write_unlock_bh(&idev->lock);
f3213831 1064 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1065 in6_dev_put(idev);
1066 ret = -1;
1067 goto out;
1068 }
1069 spin_lock_bh(&ifp->lock);
1070 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1071 idev->cnf.use_tempaddr = -1; /*XXX*/
1072 spin_unlock_bh(&ifp->lock);
53bd6749 1073 write_unlock_bh(&idev->lock);
f3213831
JP		 1074 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1075 __func__);
1da177e4
LT		 1076 in6_dev_put(idev);
1077 ret = -1;
1078 goto out;
1079 }
1080 in6_ifa_hold(ifp);
1081 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 1082 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1083 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1084 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 1085 tmp_valid_lft = min_t(__u32,
1086 ifp->valid_lft,
7a876b0e 1087 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 1088 tmp_prefered_lft = min_t(__u32,
1089 ifp->prefered_lft,
7a876b0e 1090 idev->cnf.temp_prefered_lft + age -
784e2710 1091 idev->cnf.max_desync_factor);
1da177e4 1092 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1093 tmp_tstamp = ifp->tstamp;
1094 spin_unlock_bh(&ifp->lock);
1095
eac55bf9 1096 regen_advance = idev->cnf.regen_max_retry *
7eaa48a4 1097 idev->cnf.dad_transmits *
1f9248e5 1098 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
53bd6749 1099 write_unlock_bh(&idev->lock);
95c385b4 1100
eac55bf9
BB		 1101 /* A temporary address is created only if this calculated Preferred
1102 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1103 * an implementation must not create a temporary address with a zero
1104 * Preferred Lifetime.
ecab6701
HK		 1105 * Use age calculation as in addrconf_verify to avoid unnecessary
1106 * temporary addresses being generated.
eac55bf9 1107 */
ecab6701
HK		 1108 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1109 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1110 in6_ifa_put(ifp);
1111 in6_dev_put(idev);
1112 ret = -1;
1113 goto out;
1114 }
1115
95c385b4
NH		 1116 addr_flags = IFA_F_TEMPORARY;
1117 /* set in addrconf_prefix_rcv() */
1118 if (ifp->flags & IFA_F_OPTIMISTIC)
1119 addr_flags |= IFA_F_OPTIMISTIC;
1120
4b08a8f1
HFS		 1121 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1122 ipv6_addr_scope(&addr), addr_flags,
1123 tmp_valid_lft, tmp_prefered_lft);
1124 if (IS_ERR(ift)) {
1da177e4
LT		 1125 in6_ifa_put(ifp);
1126 in6_dev_put(idev);
f3213831 1127 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1128 tmpaddr = &addr;
53bd6749 1129 write_lock_bh(&idev->lock);
1da177e4
LT		 1130 goto retry;
1131 }
1132
1133 spin_lock_bh(&ift->lock);
1134 ift->ifpub = ifp;
76f793e3 1135 ift->cstamp = now;
1da177e4
LT		 1136 ift->tstamp = tmp_tstamp;
1137 spin_unlock_bh(&ift->lock);
1138
cf22f9a2 1139 addrconf_dad_start(ift);
1da177e4
LT		 1140 in6_ifa_put(ift);
1141 in6_dev_put(idev);
1142out:
1143 return ret;
1144}
1da177e4
LT		 1145
1146/*
072047e4 1147 * Choose an appropriate source address (RFC3484)
1da177e4 1148 */
a9b05723
YH		 1149enum {
1150 IPV6_SADDR_RULE_INIT = 0,
1151 IPV6_SADDR_RULE_LOCAL,
1152 IPV6_SADDR_RULE_SCOPE,
1153 IPV6_SADDR_RULE_PREFERRED,
1154#ifdef CONFIG_IPV6_MIP6
1155 IPV6_SADDR_RULE_HOA,
1156#endif
1157 IPV6_SADDR_RULE_OIF,
1158 IPV6_SADDR_RULE_LABEL,
a9b05723 1159 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1160 IPV6_SADDR_RULE_ORCHID,
1161 IPV6_SADDR_RULE_PREFIX,
1162 IPV6_SADDR_RULE_MAX
1163};
1164
072047e4 1165struct ipv6_saddr_score {
a9b05723
YH		 1166 int rule;
1167 int addr_type;
1168 struct inet6_ifaddr *ifa;
1169 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1170 int scopedist;
1171 int matchlen;
072047e4
YH		 1172};
1173
a9b05723 1174struct ipv6_saddr_dst {
9acd9f3a 1175 const struct in6_addr *addr;
a9b05723
YH		 1176 int ifindex;
1177 int scope;
1178 int label;
7cbca67c 1179 unsigned int prefs;
a9b05723 1180};
072047e4 1181
b6f99a21 1182static inline int ipv6_saddr_preferred(int type)
1da177e4 1183{
45bb0060 1184 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1185 return 1;
1186 return 0;
1da177e4
LT		 1187}
1188
3de23255
BT		 1189static int ipv6_get_saddr_eval(struct net *net,
1190 struct ipv6_saddr_score *score,
a9b05723
YH		 1191 struct ipv6_saddr_dst *dst,
1192 int i)
1193{
1194 int ret;
1195
1196 if (i <= score->rule) {
1197 switch (i) {
1198 case IPV6_SADDR_RULE_SCOPE:
1199 ret = score->scopedist;
1200 break;
1201 case IPV6_SADDR_RULE_PREFIX:
1202 ret = score->matchlen;
1203 break;
1204 default:
1205 ret = !!test_bit(i, score->scorebits);
1206 }
1207 goto out;
1208 }
1209
1210 switch (i) {
1211 case IPV6_SADDR_RULE_INIT:
1212 /* Rule 0: remember if hiscore is not ready yet */
1213 ret = !!score->ifa;
1214 break;
1215 case IPV6_SADDR_RULE_LOCAL:
1216 /* Rule 1: Prefer same address */
1217 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1218 break;
1219 case IPV6_SADDR_RULE_SCOPE:
1220 /* Rule 2: Prefer appropriate scope
1221 *
1222 * ret
1223 * ^
1224 * -1 | d 15
1225 * ---+--+-+---> scope
1226 * |
1227 * | d is scope of the destination.
1228 * B-d | \
1229 * | \ <- smaller scope is better if
db9c7c39 1230 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1231 * | ret = B - scope (-1 <= scope >= d <= 15).
1232 * d-C-1 | /
1233 * |/ <- greater is better
1234 * -C / if scope is not enough for destination.
1235 * /| ret = scope - C (-1 <= d < scope <= 15).
1236 *
1237 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1238 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1239 * Assume B = 0 and we get C > 29.
1240 */
1241 ret = __ipv6_addr_src_scope(score->addr_type);
1242 if (ret >= dst->scope)
1243 ret = -ret;
1244 else
1245 ret -= 128; /* 30 is enough */
1246 score->scopedist = ret;
1247 break;
1248 case IPV6_SADDR_RULE_PREFERRED:
1249 /* Rule 3: Avoid deprecated and optimistic addresses */
1250 ret = ipv6_saddr_preferred(score->addr_type) ||
1251 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1252 break;
1253#ifdef CONFIG_IPV6_MIP6
1254 case IPV6_SADDR_RULE_HOA:
7cbca67c 1255 {
a9b05723 1256 /* Rule 4: Prefer home address */
7cbca67c
YH		 1257 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1258 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1259 break;
7cbca67c 1260 }
a9b05723
YH		 1261#endif
1262 case IPV6_SADDR_RULE_OIF:
1263 /* Rule 5: Prefer outgoing interface */
1264 ret = (!dst->ifindex ||
1265 dst->ifindex == score->ifa->idev->dev->ifindex);
1266 break;
1267 case IPV6_SADDR_RULE_LABEL:
1268 /* Rule 6: Prefer matching label */
3de23255
BT		 1269 ret = ipv6_addr_label(net,
1270 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1271 score->ifa->idev->dev->ifindex) == dst->label;
1272 break;
a9b05723 1273 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1274 {
a9b05723 1275 /* Rule 7: Prefer public address
25985edc 1276 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1277 */
7cbca67c
YH		 1278 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1279 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1280 score->ifa->idev->cnf.use_tempaddr >= 2;
1281 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1282 break;
7cbca67c 1283 }
a9b05723
YH		 1284 case IPV6_SADDR_RULE_ORCHID:
1285 /* Rule 8-: Prefer ORCHID vs ORCHID or
1286 * non-ORCHID vs non-ORCHID
1287 */
1288 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1289 ipv6_addr_orchid(dst->addr));
1290 break;
1291 case IPV6_SADDR_RULE_PREFIX:
1292 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1293 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1294 if (ret > score->ifa->prefix_len)
1295 ret = score->ifa->prefix_len;
1296 score->matchlen = ret;
a9b05723
YH		 1297 break;
1298 default:
1299 ret = 0;
1300 }
1301
1302 if (ret)
1303 __set_bit(i, score->scorebits);
1304 score->rule = i;
1305out:
1306 return ret;
1307}
1308
b3f644fc 1309int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1310 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1311 struct in6_addr *saddr)
1da177e4 1312{
a9b05723
YH		 1313 struct ipv6_saddr_score scores[2],
1314 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1315 struct ipv6_saddr_dst dst;
072047e4 1316 struct net_device *dev;
a9b05723 1317 int dst_type;
1da177e4 1318
a9b05723
YH		 1319 dst_type = __ipv6_addr_type(daddr);
1320 dst.addr = daddr;
1321 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1322 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1323 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1324 dst.prefs = prefs;
a9b05723
YH		 1325
1326 hiscore->rule = -1;
1327 hiscore->ifa = NULL;
1da177e4 1328
8814c4b5 1329 rcu_read_lock();
1da177e4 1330
c6d14c84 1331 for_each_netdev_rcu(net, dev) {
072047e4 1332 struct inet6_dev *idev;
072047e4 1333
a9b05723 1334 /* Candidate Source Address (section 4)
072047e4
YH		 1335 * - multicast and link-local destination address,
1336 * the set of candidate source address MUST only
1337 * include addresses assigned to interfaces
1338 * belonging to the same link as the outgoing
1339 * interface.
1340 * (- For site-local destination addresses, the
1341 * set of candidate source addresses MUST only
1342 * include addresses assigned to interfaces
1343 * belonging to the same site as the outgoing
1344 * interface.)
1345 */
a9b05723
YH		 1346 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1347 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1348 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1349 continue;
1da177e4 1350
1da177e4 1351 idev = __in6_dev_get(dev);
072047e4
YH		 1352 if (!idev)
1353 continue;
1354
1355 read_lock_bh(&idev->lock);
502a2ffd 1356 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1357 int i;
072047e4 1358
a9b05723 1359 /*
6b3ae80a
YH		 1360 * - Tentative Address (RFC2462 section 5.4)
1361 * - A tentative address is not considered
1362 * "assigned to an interface" in the traditional
95c385b4 1363 * sense, unless it is also flagged as optimistic.
6b3ae80a 1364 * - Candidate Source Address (section 4)
072047e4
YH		 1365 * - In any case, anycast addresses, multicast
1366 * addresses, and the unspecified address MUST
1367 * NOT be included in a candidate set.
1368 */
a9b05723
YH		 1369 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1370 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1371 continue;
a9b05723
YH		 1372
1373 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1374
1375 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1376 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1377 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1378 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1379 "assigned as unicast address on %s",
1380 dev->name);
1381 continue;
1382 }
1383
a9b05723
YH		 1384 score->rule = -1;
1385 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1386
1387 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1388 int minihiscore, miniscore;
1389
3de23255
BT		 1390 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1391 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1392
1393 if (minihiscore > miniscore) {
1394 if (i == IPV6_SADDR_RULE_SCOPE &&
1395 score->scopedist > 0) {
1396 /*
1397 * special case:
1398 * each remaining entry
1399 * has too small (not enough)
1400 * scope, because ifa entries
1401 * are sorted by their scope
1402 * values.
1403 */
1404 goto try_nextdev;
1405 }
1406 break;
1407 } else if (minihiscore < miniscore) {
a9b05723
YH		 1408 if (hiscore->ifa)
1409 in6_ifa_put(hiscore->ifa);
1410
1411 in6_ifa_hold(score->ifa);
1412
a0bffffc 1413 swap(hiscore, score);
a9b05723
YH		 1414
1415 /* restore our iterator */
1416 score->ifa = hiscore->ifa;
1417
1418 break;
1da177e4 1419 }
072047e4 1420 }
1da177e4 1421 }
a9b05723 1422try_nextdev:
072047e4 1423 read_unlock_bh(&idev->lock);
1da177e4 1424 }
8814c4b5 1425 rcu_read_unlock();
1da177e4 1426
a9b05723 1427 if (!hiscore->ifa)
072047e4 1428 return -EADDRNOTAVAIL;
1ab1457c 1429
4e3fd7a0 1430 *saddr = hiscore->ifa->addr;
a9b05723 1431 in6_ifa_put(hiscore->ifa);
072047e4 1432 return 0;
1da177e4 1433}
5e5f3f0f 1434EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1435
8965779d 1436int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1437 u32 banned_flags)
b7b1bfce
HFS		 1438{
1439 struct inet6_ifaddr *ifp;
1440 int err = -EADDRNOTAVAIL;
1441
602582ca
HFS		 1442 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1443 if (ifp->scope > IFA_LINK)
1444 break;
b7b1bfce
HFS		 1445 if (ifp->scope == IFA_LINK &&
1446 !(ifp->flags & banned_flags)) {
1447 *addr = ifp->addr;
1448 err = 0;
1449 break;
1450 }
1451 }
1452 return err;
1453}
1454
95c385b4 1455int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1456 u32 banned_flags)
1da177e4
LT		 1457{
1458 struct inet6_dev *idev;
1459 int err = -EADDRNOTAVAIL;
1460
8814c4b5 1461 rcu_read_lock();
e21e8467
SH		 1462 idev = __in6_dev_get(dev);
1463 if (idev) {
1da177e4 1464 read_lock_bh(&idev->lock);
b7b1bfce 1465 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1466 read_unlock_bh(&idev->lock);
1467 }
8814c4b5 1468 rcu_read_unlock();
1da177e4
LT		 1469 return err;
1470}
1471
1472static int ipv6_count_addresses(struct inet6_dev *idev)
1473{
1474 int cnt = 0;
1475 struct inet6_ifaddr *ifp;
1476
1477 read_lock_bh(&idev->lock);
502a2ffd 1478 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1479 cnt++;
1480 read_unlock_bh(&idev->lock);
1481 return cnt;
1482}
1483
b71d1d42 1484int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1485 const struct net_device *dev, int strict)
1da177e4 1486{
eedf042a 1487 struct inet6_ifaddr *ifp;
ddbe5032 1488 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1489
5c578aed 1490 rcu_read_lock_bh();
b67bfe0d 1491 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1492 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1493 continue;
1da177e4 1494 if (ipv6_addr_equal(&ifp->addr, addr) &&
eedf042a
SH		 1495 !(ifp->flags&IFA_F_TENTATIVE) &&
1496 (dev == NULL || ifp->idev->dev == dev ||
1497 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1498 rcu_read_unlock_bh();
1499 return 1;
1da177e4
LT		 1500 }
1501 }
5c578aed 1502
eedf042a
SH		 1503 rcu_read_unlock_bh();
1504 return 0;
1da177e4 1505}
7159039a
YH		 1506EXPORT_SYMBOL(ipv6_chk_addr);
1507
3e81c6da
DM		 1508static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1509 struct net_device *dev)
1da177e4 1510{
ddbe5032 1511 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1512 struct inet6_ifaddr *ifp;
1da177e4 1513
b67bfe0d 1514 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1515 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1516 continue;
1da177e4
LT		 1517 if (ipv6_addr_equal(&ifp->addr, addr)) {
1518 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1519 return true;
1da177e4
LT		 1520 }
1521 }
3e81c6da 1522 return false;
1da177e4
LT		 1523}
1524
7df37ff3
CB		 1525/* Compares an address/prefix_len with addresses on device @dev.
1526 * If one is found it returns true.
1527 */
1528bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1529 const unsigned int prefix_len, struct net_device *dev)
1530{
1531 struct inet6_dev *idev;
1532 struct inet6_ifaddr *ifa;
1533 bool ret = false;
1534
1535 rcu_read_lock();
1536 idev = __in6_dev_get(dev);
1537 if (idev) {
1538 read_lock_bh(&idev->lock);
1539 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1540 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1541 if (ret)
1542 break;
1543 }
1544 read_unlock_bh(&idev->lock);
1545 }
1546 rcu_read_unlock();
1547
1548 return ret;
1549}
1550EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1551
b71d1d42 1552int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1553{
1554 struct inet6_dev *idev;
1555 struct inet6_ifaddr *ifa;
1556 int onlink;
1557
1558 onlink = 0;
1559 rcu_read_lock();
1560 idev = __in6_dev_get(dev);
1561 if (idev) {
1562 read_lock_bh(&idev->lock);
502a2ffd 1563 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1564 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1565 ifa->prefix_len);
1566 if (onlink)
1567 break;
1568 }
1569 read_unlock_bh(&idev->lock);
1570 }
1571 rcu_read_unlock();
1572 return onlink;
1573}
52eeeb84
YH		 1574EXPORT_SYMBOL(ipv6_chk_prefix);
1575
9acd9f3a 1576struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1577 struct net_device *dev, int strict)
1da177e4 1578{
b79d1d54 1579 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1580 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1581
5c578aed 1582 rcu_read_lock_bh();
b67bfe0d 1583 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1584 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1585 continue;
1da177e4
LT		 1586 if (ipv6_addr_equal(&ifp->addr, addr)) {
1587 if (dev == NULL || ifp->idev->dev == dev ||
1588 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1589 result = ifp;
1da177e4
LT		 1590 in6_ifa_hold(ifp);
1591 break;
1592 }
1593 }
1594 }
5c578aed 1595 rcu_read_unlock_bh();
1da177e4 1596
b79d1d54 1597 return result;
1da177e4
LT		 1598}
1599
1da177e4
LT		 1600/* Gets referenced address, destroys ifaddr */
1601
cc411d0b 1602static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1603{
1da177e4
LT		 1604 if (ifp->flags&IFA_F_PERMANENT) {
1605 spin_lock_bh(&ifp->lock);
c15b1cca 1606 addrconf_del_dad_work(ifp);
1da177e4 1607 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1608 if (dad_failed)
1609 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1610 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1611 if (dad_failed)
1612 ipv6_ifa_notify(0, ifp);
1da177e4 1613 in6_ifa_put(ifp);
1da177e4
LT		 1614 } else if (ifp->flags&IFA_F_TEMPORARY) {
1615 struct inet6_ifaddr *ifpub;
1616 spin_lock_bh(&ifp->lock);
1617 ifpub = ifp->ifpub;
1618 if (ifpub) {
1619 in6_ifa_hold(ifpub);
1620 spin_unlock_bh(&ifp->lock);
1621 ipv6_create_tempaddr(ifpub, ifp);
1622 in6_ifa_put(ifpub);
1623 } else {
1624 spin_unlock_bh(&ifp->lock);
1625 }
1626 ipv6_del_addr(ifp);
c15b1cca 1627 } else {
1da177e4 1628 ipv6_del_addr(ifp);
c15b1cca 1629 }
1da177e4
LT		 1630}
1631
f2344a13
HX		 1632static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1633{
1634 int err = -ENOENT;
1635
c15b1cca 1636 spin_lock_bh(&ifp->state_lock);
f2344a13
HX		 1637 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1638 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1639 err = 0;
1640 }
c15b1cca 1641 spin_unlock_bh(&ifp->state_lock);
f2344a13
HX		 1642
1643 return err;
1644}
1645
3c21edbd
YH		 1646void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1647{
1b34be74 1648 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1649
853dc2e0
UB		 1650 if (addrconf_dad_end(ifp)) {
1651 in6_ifa_put(ifp);
f2344a13 1652 return;
853dc2e0 1653 }
f2344a13 1654
e87cc472
JP		 1655 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1656 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1657
1b34be74
YH		 1658 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1659 struct in6_addr addr;
1660
1661 addr.s6_addr32[0] = htonl(0xfe800000);
1662 addr.s6_addr32[1] = 0;
1663
1664 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1665 ipv6_addr_equal(&ifp->addr, &addr)) {
1666 /* DAD failed for link-local based on MAC address */
1667 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1668
f3213831 1669 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1670 ifp->idev->dev->name);
1b34be74
YH		 1671 }
1672 }
1673
c15b1cca
HFS		 1674 spin_lock_bh(&ifp->state_lock);
1675 /* transition from _POSTDAD to _ERRDAD */
1676 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1677 spin_unlock_bh(&ifp->state_lock);
1678
1679 addrconf_mod_dad_work(ifp, 0);
3c21edbd 1680}
1da177e4
LT		 1681
1682/* Join to solicited addr multicast group. */
1683
b71d1d42 1684void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1685{
1686 struct in6_addr maddr;
1687
c15b1cca
HFS		 1688 ASSERT_RTNL();
1689
1da177e4
LT		 1690 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1691 return;
1692
1693 addrconf_addr_solict_mult(addr, &maddr);
1694 ipv6_dev_mc_inc(dev, &maddr);
1695}
1696
b71d1d42 1697void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1698{
1699 struct in6_addr maddr;
1700
c15b1cca
HFS		 1701 ASSERT_RTNL();
1702
1da177e4
LT		 1703 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1704 return;
1705
1706 addrconf_addr_solict_mult(addr, &maddr);
1707 __ipv6_dev_mc_dec(idev, &maddr);
1708}
1709
20380731 1710static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1711{
1712 struct in6_addr addr;
c15b1cca
HFS		 1713
1714 ASSERT_RTNL();
1715
88ad3149 1716 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 1717 return;
1da177e4
LT		 1718 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1719 if (ipv6_addr_any(&addr))
1720 return;
1721 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1722}
1723
20380731 1724static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1725{
1726 struct in6_addr addr;
c15b1cca
HFS		 1727
1728 ASSERT_RTNL();
1729
88ad3149 1730 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 1731 return;
1da177e4
LT		 1732 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1733 if (ipv6_addr_any(&addr))
1734 return;
1735 __ipv6_dev_ac_dec(ifp->idev, &addr);
1736}
1737
073a8e0e
YH		 1738static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1739{
1740 if (dev->addr_len != ETH_ALEN)
1741 return -1;
1742 memcpy(eui, dev->dev_addr, 3);
1743 memcpy(eui + 5, dev->dev_addr + 3, 3);
1744
1745 /*
1746 * The zSeries OSA network cards can be shared among various
1747 * OS instances, but the OSA cards have only one MAC address.
1748 * This leads to duplicate address conflicts in conjunction
1749 * with IPv6 if more than one instance uses the same card.
1750 *
1751 * The driver for these cards can deliver a unique 16-bit
1752 * identifier for each instance sharing the same card. It is
1753 * placed instead of 0xFFFE in the interface identifier. The
1754 * "u" bit of the interface identifier is not inverted in this
1755 * case. Hence the resulting interface identifier has local
1756 * scope according to RFC2373.
1757 */
1758 if (dev->dev_id) {
1759 eui[3] = (dev->dev_id >> 8) & 0xFF;
1760 eui[4] = dev->dev_id & 0xFF;
1761 } else {
1762 eui[3] = 0xFF;
1763 eui[4] = 0xFE;
1764 eui[0] ^= 2;
1765 }
1766 return 0;
1767}
1768
06a4c1c5 1769static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1770{
1771 if (dev->addr_len != IEEE802154_ADDR_LEN)
1772 return -1;
1773 memcpy(eui, dev->dev_addr, 8);
5e98a36e 1774 eui[0] ^= 2;
06a4c1c5 1775 return 0;
1776}
1777
cb6bf355
YH		 1778static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1779{
1780 union fwnet_hwaddr *ha;
1781
1782 if (dev->addr_len != FWNET_ALEN)
1783 return -1;
1784
1785 ha = (union fwnet_hwaddr *)dev->dev_addr;
1786
1787 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1788 eui[0] ^= 2;
1789 return 0;
1790}
1791
073a8e0e
YH		 1792static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1793{
1794 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1795 if (dev->addr_len != ARCNET_ALEN)
1796 return -1;
1797 memset(eui, 0, 7);
8e5e8f30 1798 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1799 return 0;
1800}
1801
1802static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1803{
1804 if (dev->addr_len != INFINIBAND_ALEN)
1805 return -1;
1806 memcpy(eui, dev->dev_addr + 12, 8);
1807 eui[0] |= 2;
1808 return 0;
1809}
1810
c61393ea 1811static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1812{
9af28511
SH		 1813 if (addr == 0)
1814 return -1;
dfd982ba
YH		 1815 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1816 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1817 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1818 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1819 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1820 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1821 eui[1] = 0;
1822 eui[2] = 0x5E;
1823 eui[3] = 0xFE;
1824 memcpy(eui + 4, &addr, 4);
1825 return 0;
1826}
dfd982ba
YH		 1827
1828static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1829{
1830 if (dev->priv_flags & IFF_ISATAP)
1831 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1832 return -1;
1833}
1834
aee80b54 1835static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1836{
1837 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1838}
1839
e837735e
ND		 1840static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1841{
1842 memcpy(eui, dev->perm_addr, 3);
1843 memcpy(eui + 5, dev->perm_addr + 3, 3);
1844 eui[3] = 0xFF;
1845 eui[4] = 0xFE;
1846 eui[0] ^= 2;
1847 return 0;
1848}
1849
1da177e4
LT		 1850static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1851{
1852 switch (dev->type) {
1853 case ARPHRD_ETHER:
1854 case ARPHRD_FDDI:
073a8e0e 1855 return addrconf_ifid_eui48(eui, dev);
1da177e4 1856 case ARPHRD_ARCNET:
073a8e0e 1857 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1858 case ARPHRD_INFINIBAND:
073a8e0e 1859 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1860 case ARPHRD_SIT:
dfd982ba 1861 return addrconf_ifid_sit(eui, dev);
aee80b54 1862 case ARPHRD_IPGRE:
1863 return addrconf_ifid_gre(eui, dev);
e74bccb8 1864 case ARPHRD_6LOWPAN:
06a4c1c5 1865 case ARPHRD_IEEE802154:
1866 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 1867 case ARPHRD_IEEE1394:
1868 return addrconf_ifid_ieee1394(eui, dev);
e837735e
ND		 1869 case ARPHRD_TUNNEL6:
1870 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 1871 }
1872 return -1;
1873}
1874
1875static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1876{
1877 int err = -1;
1878 struct inet6_ifaddr *ifp;
1879
1880 read_lock_bh(&idev->lock);
602582ca
HFS		 1881 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1882 if (ifp->scope > IFA_LINK)
1883 break;
1da177e4
LT		 1884 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1885 memcpy(eui, ifp->addr.s6_addr+8, 8);
1886 err = 0;
1887 break;
1888 }
1889 }
1890 read_unlock_bh(&idev->lock);
1891 return err;
1892}
1893
1da177e4 1894/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 1895static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 1896{
1da177e4 1897regen:
955189ef 1898 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1899 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1900
1901 /*
1902 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1903 * check if generated address is not inappropriate
1904 *
1905 * - Reserved subnet anycast (RFC 2526)
1906 * 11111101 11....11 1xxxxxxx
c7dc89c0 1907 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1908 * 00-00-5E-FE-xx-xx-xx-xx
1909 * - value 0
1910 * - XXX: already assigned to an address on the device
1911 */
1ab1457c 1912 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1913 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1914 (idev->rndid[7]&0x80))
1915 goto regen;
1916 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1917 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1918 goto regen;
1919 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1920 goto regen;
1921 }
1da177e4
LT		 1922}
1923
1924static void ipv6_regen_rndid(unsigned long data)
1925{
1926 struct inet6_dev *idev = (struct inet6_dev *) data;
1927 unsigned long expires;
1928
8814c4b5 1929 rcu_read_lock_bh();
1da177e4
LT		 1930 write_lock_bh(&idev->lock);
1931
1932 if (idev->dead)
1933 goto out;
1934
eb7e0575 1935 __ipv6_regen_rndid(idev);
1ab1457c 1936
1da177e4 1937 expires = jiffies +
1ab1457c 1938 idev->cnf.temp_prefered_lft * HZ -
1f9248e5
JP		 1939 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
1940 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
784e2710 1941 idev->cnf.max_desync_factor * HZ;
1da177e4 1942 if (time_before(expires, jiffies)) {
f3213831
JP		 1943 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1944 __func__, idev->dev->name);
1da177e4
LT		 1945 goto out;
1946 }
1947
1948 if (!mod_timer(&idev->regen_timer, expires))
1949 in6_dev_hold(idev);
1950
1951out:
1952 write_unlock_bh(&idev->lock);
8814c4b5 1953 rcu_read_unlock_bh();
1da177e4
LT		 1954 in6_dev_put(idev);
1955}
1956
eb7e0575 1957static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 1958{
1da177e4 1959 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 1960 __ipv6_regen_rndid(idev);
1da177e4 1961}
1da177e4
LT		 1962
1963/*
1964 * Add prefix route.
1965 */
1966
1967static void
1968addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1969 unsigned long expires, u32 flags)
1da177e4 1970{
86872cb5
TG		 1971 struct fib6_config cfg = {
1972 .fc_table = RT6_TABLE_PREFIX,
1973 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1974 .fc_ifindex = dev->ifindex,
1975 .fc_expires = expires,
1976 .fc_dst_len = plen,
1977 .fc_flags = RTF_UP | flags,
c346dca1 1978 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1979 .fc_protocol = RTPROT_KERNEL,
86872cb5 1980 };
1da177e4 1981
4e3fd7a0 1982 cfg.fc_dst = *pfx;
1da177e4
LT		 1983
1984 /* Prevent useless cloning on PtP SIT.
1985 This thing is done here expecting that the whole
1986 class of non-broadcast devices need not cloning.
1987 */
07a93626 1988#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 1989 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1990 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1991#endif
1da177e4 1992
86872cb5 1993 ip6_route_add(&cfg);
1da177e4
LT		 1994}
1995
14ef37b6
AH		 1996
1997static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1998 int plen,
1999 const struct net_device *dev,
2000 u32 flags, u32 noflags)
2001{
2002 struct fib6_node *fn;
2003 struct rt6_info *rt = NULL;
2004 struct fib6_table *table;
2005
2006 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
2007 if (table == NULL)
2008 return NULL;
2009
5744dd9b 2010 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2011 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2012 if (!fn)
2013 goto out;
2014 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2015 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2016 continue;
2017 if ((rt->rt6i_flags & flags) != flags)
2018 continue;
85da53bf 2019 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2020 continue;
2021 dst_hold(&rt->dst);
2022 break;
2023 }
2024out:
5744dd9b 2025 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2026 return rt;
2027}
2028
2029
1da177e4
LT		 2030/* Create "default" multicast route to the interface */
2031
2032static void addrconf_add_mroute(struct net_device *dev)
2033{
86872cb5
TG		 2034 struct fib6_config cfg = {
2035 .fc_table = RT6_TABLE_LOCAL,
2036 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2037 .fc_ifindex = dev->ifindex,
2038 .fc_dst_len = 8,
2039 .fc_flags = RTF_UP,
c346dca1 2040 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2041 };
2042
2043 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2044
2045 ip6_route_add(&cfg);
1da177e4
LT		 2046}
2047
1da177e4
LT		 2048static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2049{
2050 struct inet6_dev *idev;
2051
2052 ASSERT_RTNL();
2053
e21e8467
SH		 2054 idev = ipv6_find_idev(dev);
2055 if (!idev)
64e724f6
BH		 2056 return ERR_PTR(-ENOBUFS);
2057
2058 if (idev->cnf.disable_ipv6)
2059 return ERR_PTR(-EACCES);
1da177e4
LT		 2060
2061 /* Add default multicast route */
4af04aba
LW		 2062 if (!(dev->flags & IFF_LOOPBACK))
2063 addrconf_add_mroute(dev);
1da177e4 2064
1da177e4
LT		 2065 return idev;
2066}
2067
53bd6749
JP		 2068static void manage_tempaddrs(struct inet6_dev *idev,
2069 struct inet6_ifaddr *ifp,
2070 __u32 valid_lft, __u32 prefered_lft,
2071 bool create, unsigned long now)
2072{
2073 u32 flags;
2074 struct inet6_ifaddr *ift;
2075
2076 read_lock_bh(&idev->lock);
2077 /* update all temporary addresses in the list */
2078 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2079 int age, max_valid, max_prefered;
2080
2081 if (ifp != ift->ifpub)
2082 continue;
2083
2084 /* RFC 4941 section 3.3:
2085 * If a received option will extend the lifetime of a public
2086 * address, the lifetimes of temporary addresses should
2087 * be extended, subject to the overall constraint that no
2088 * temporary addresses should ever remain "valid" or "preferred"
2089 * for a time longer than (TEMP_VALID_LIFETIME) or
2090 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2091 */
2092 age = (now - ift->cstamp) / HZ;
2093 max_valid = idev->cnf.temp_valid_lft - age;
2094 if (max_valid < 0)
2095 max_valid = 0;
2096
2097 max_prefered = idev->cnf.temp_prefered_lft -
2098 idev->cnf.max_desync_factor - age;
2099 if (max_prefered < 0)
2100 max_prefered = 0;
2101
2102 if (valid_lft > max_valid)
2103 valid_lft = max_valid;
2104
2105 if (prefered_lft > max_prefered)
2106 prefered_lft = max_prefered;
2107
2108 spin_lock(&ift->lock);
2109 flags = ift->flags;
2110 ift->valid_lft = valid_lft;
2111 ift->prefered_lft = prefered_lft;
2112 ift->tstamp = now;
2113 if (prefered_lft > 0)
2114 ift->flags &= ~IFA_F_DEPRECATED;
2115
2116 spin_unlock(&ift->lock);
2117 if (!(flags&IFA_F_TENTATIVE))
2118 ipv6_ifa_notify(0, ift);
2119 }
2120
2121 if ((create || list_empty(&idev->tempaddr_list)) &&
2122 idev->cnf.use_tempaddr > 0) {
2123 /* When a new public address is created as described
2124 * in [ADDRCONF], also create a new temporary address.
2125 * Also create a temporary address if it's enabled but
2126 * no temporary address currently exists.
2127 */
2128 read_unlock_bh(&idev->lock);
2129 ipv6_create_tempaddr(ifp, NULL);
2130 } else {
2131 read_unlock_bh(&idev->lock);
2132 }
2133}
2134
e6bff995 2135void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2136{
2137 struct prefix_info *pinfo;
2138 __u32 valid_lft;
2139 __u32 prefered_lft;
2140 int addr_type;
1da177e4 2141 struct inet6_dev *in6_dev;
56d417b1 2142 struct net *net = dev_net(dev);
1da177e4
LT		 2143
2144 pinfo = (struct prefix_info *) opt;
1ab1457c 2145
1da177e4 2146 if (len < sizeof(struct prefix_info)) {
ba3542e1 2147 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2148 return;
2149 }
1ab1457c 2150
1da177e4
LT		 2151 /*
2152 * Validation checks ([ADDRCONF], page 19)
2153 */
2154
2155 addr_type = ipv6_addr_type(&pinfo->prefix);
2156
2157 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2158 return;
2159
2160 valid_lft = ntohl(pinfo->valid);
2161 prefered_lft = ntohl(pinfo->prefered);
2162
2163 if (prefered_lft > valid_lft) {
e87cc472 2164 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2165 return;
2166 }
2167
2168 in6_dev = in6_dev_get(dev);
2169
2170 if (in6_dev == NULL) {
e87cc472
JP		 2171 net_dbg_ratelimited("addrconf: device %s not configured\n",
2172 dev->name);
1da177e4
LT		 2173 return;
2174 }
2175
2176 /*
2177 * Two things going on here:
2178 * 1) Add routes for on-link prefixes
2179 * 2) Configure prefixes with the auto flag set
2180 */
2181
4bed72e4
YH		 2182 if (pinfo->onlink) {
2183 struct rt6_info *rt;
2184 unsigned long rt_expires;
2185
6f704992
YH		 2186 /* Avoid arithmetic overflow. Really, we could
2187 * save rt_expires in seconds, likely valid_lft,
2188 * but it would require division in fib gc, that it
2189 * not good.
2190 */
4bed72e4
YH		 2191 if (HZ > USER_HZ)
2192 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2193 else
2194 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2195
4bed72e4
YH		 2196 if (addrconf_finite_timeout(rt_expires))
2197 rt_expires *= HZ;
1da177e4 2198
14ef37b6
AH		 2199 rt = addrconf_get_prefix_route(&pinfo->prefix,
2200 pinfo->prefix_len,
2201 dev,
2202 RTF_ADDRCONF | RTF_PREFIX_RT,
2203 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2204
14ef37b6 2205 if (rt) {
6f704992
YH		 2206 /* Autoconf prefix route */
2207 if (valid_lft == 0) {
2208 ip6_del_rt(rt);
2209 rt = NULL;
4bed72e4 2210 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2211 /* not infinity */
1716a961 2212 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2213 } else {
1716a961 2214 rt6_clean_expires(rt);
1da177e4
LT		 2215 }
2216 } else if (valid_lft) {
6f704992 2217 clock_t expires = 0;
4bed72e4
YH		 2218 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2219 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2220 /* not infinity */
2221 flags |= RTF_EXPIRES;
2222 expires = jiffies_to_clock_t(rt_expires);
2223 }
1da177e4 2224 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2225 dev, expires, flags);
1da177e4 2226 }
94e187c0 2227 ip6_rt_put(rt);
1da177e4
LT		 2228 }
2229
2230 /* Try to figure out our local address for this prefix */
2231
2232 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2233 struct inet6_ifaddr *ifp;
1da177e4
LT		 2234 struct in6_addr addr;
2235 int create = 0, update_lft = 0;
617fe29d 2236 bool tokenized = false;
1da177e4
LT		 2237
2238 if (pinfo->prefix_len == 64) {
2239 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2240
2241 if (!ipv6_addr_any(&in6_dev->token)) {
2242 read_lock_bh(&in6_dev->lock);
2243 memcpy(addr.s6_addr + 8,
2244 in6_dev->token.s6_addr + 8, 8);
2245 read_unlock_bh(&in6_dev->lock);
617fe29d 2246 tokenized = true;
f53adae4
DB		 2247 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2248 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1da177e4
LT		 2249 in6_dev_put(in6_dev);
2250 return;
2251 }
2252 goto ok;
2253 }
e87cc472
JP		 2254 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2255 pinfo->prefix_len);
1da177e4
LT		 2256 in6_dev_put(in6_dev);
2257 return;
2258
2259ok:
2260
53b7997f 2261 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 2262
2263 if (ifp == NULL && valid_lft) {
2264 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2265 u32 addr_flags = 0;
2266
2267#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2268 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2269 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 2270 addr_flags = IFA_F_OPTIMISTIC;
2271#endif
1da177e4
LT		 2272
2273 /* Do not allow to create too much of autoconfigured
2274 * addresses; this would be too easy way to crash kernel.
2275 */
2276 if (!max_addresses ||
2277 ipv6_count_addresses(in6_dev) < max_addresses)
3f8f5298
JP		 2278 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2279 pinfo->prefix_len,
95c385b4 2280 addr_type&IPV6_ADDR_SCOPE_MASK,
8a226b2c
JB		 2281 addr_flags, valid_lft,
2282 prefered_lft);
1da177e4 2283
3f0d2ba0 2284 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2285 in6_dev_put(in6_dev);
2286 return;
2287 }
2288
8a226b2c
JB		 2289 update_lft = 0;
2290 create = 1;
c15b1cca
HFS		 2291 spin_lock_bh(&ifp->lock);
2292 ifp->flags |= IFA_F_MANAGETEMPADDR;
1da177e4 2293 ifp->cstamp = jiffies;
617fe29d 2294 ifp->tokenized = tokenized;
c15b1cca 2295 spin_unlock_bh(&ifp->lock);
cf22f9a2 2296 addrconf_dad_start(ifp);
1da177e4
LT		 2297 }
2298
2299 if (ifp) {
479840ff 2300 u32 flags;
1da177e4 2301 unsigned long now;
1da177e4
LT		 2302 u32 stored_lft;
2303
2304 /* update lifetime (RFC2462 5.5.3 e) */
2305 spin_lock(&ifp->lock);
2306 now = jiffies;
2307 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2308 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2309 else
2310 stored_lft = 0;
8a226b2c 2311 if (!update_lft && !create && stored_lft) {
c9d55d5b
PM		 2312 const u32 minimum_lft = min(
2313 stored_lft, (u32)MIN_VALID_LIFETIME);
2314 valid_lft = max(valid_lft, minimum_lft);
2315
2316 /* RFC4862 Section 5.5.3e:
2317 * "Note that the preferred lifetime of the
2318 * corresponding address is always reset to
2319 * the Preferred Lifetime in the received
2320 * Prefix Information option, regardless of
2321 * whether the valid lifetime is also reset or
2322 * ignored."
2323 *
2324 * So we should always update prefered_lft here.
2325 */
2326 update_lft = 1;
1da177e4
LT		 2327 }
2328
2329 if (update_lft) {
2330 ifp->valid_lft = valid_lft;
2331 ifp->prefered_lft = prefered_lft;
2332 ifp->tstamp = now;
2333 flags = ifp->flags;
2334 ifp->flags &= ~IFA_F_DEPRECATED;
2335 spin_unlock(&ifp->lock);
2336
2337 if (!(flags&IFA_F_TENTATIVE))
2338 ipv6_ifa_notify(0, ifp);
2339 } else
2340 spin_unlock(&ifp->lock);
2341
53bd6749
JP		 2342 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2343 create, now);
5d9efa7e 2344
1da177e4 2345 in6_ifa_put(ifp);
c15b1cca 2346 addrconf_verify();
1da177e4
LT		 2347 }
2348 }
2349 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2350 in6_dev_put(in6_dev);
2351}
2352
2353/*
2354 * Set destination address.
2355 * Special case for SIT interfaces where we create a new "virtual"
2356 * device.
2357 */
af284937 2358int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2359{
2360 struct in6_ifreq ireq;
2361 struct net_device *dev;
2362 int err = -EINVAL;
2363
2364 rtnl_lock();
2365
2366 err = -EFAULT;
2367 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2368 goto err_exit;
2369
af284937 2370 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2371
2372 err = -ENODEV;
2373 if (dev == NULL)
2374 goto err_exit;
2375
07a93626 2376#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2377 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2378 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2379 struct ifreq ifr;
1da177e4
LT		 2380 struct ip_tunnel_parm p;
2381
2382 err = -EADDRNOTAVAIL;
2383 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2384 goto err_exit;
2385
2386 memset(&p, 0, sizeof(p));
2387 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2388 p.iph.saddr = 0;
2389 p.iph.version = 4;
2390 p.iph.ihl = 5;
2391 p.iph.protocol = IPPROTO_IPV6;
2392 p.iph.ttl = 64;
d20b3109 2393 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2394
5bc3eb7e
SH		 2395 if (ops->ndo_do_ioctl) {
2396 mm_segment_t oldfs = get_fs();
2397
2398 set_fs(KERNEL_DS);
2399 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2400 set_fs(oldfs);
2401 } else
2402 err = -EOPNOTSUPP;
1da177e4
LT		 2403
2404 if (err == 0) {
2405 err = -ENOBUFS;
af284937
DL		 2406 dev = __dev_get_by_name(net, p.name);
2407 if (!dev)
1da177e4
LT		 2408 goto err_exit;
2409 err = dev_open(dev);
2410 }
2411 }
0be669bb 2412#endif
1da177e4
LT		 2413
2414err_exit:
2415 rtnl_unlock();
2416 return err;
2417}
2418
2419/*
2420 * Manual configuration of address on an interface
2421 */
479840ff
JP		 2422static int inet6_addr_add(struct net *net, int ifindex,
2423 const struct in6_addr *pfx,
caeaba79 2424 const struct in6_addr *peer_pfx,
479840ff
JP		 2425 unsigned int plen, __u32 ifa_flags,
2426 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2427{
2428 struct inet6_ifaddr *ifp;
2429 struct inet6_dev *idev;
2430 struct net_device *dev;
2431 int scope;
6f704992
YH		 2432 u32 flags;
2433 clock_t expires;
4bed72e4 2434 unsigned long timeout;
1da177e4
LT		 2435
2436 ASSERT_RTNL();
1ab1457c 2437
24ef0da7
TG		 2438 if (plen > 128)
2439 return -EINVAL;
2440
0778769d
NT		 2441 /* check the lifetime */
2442 if (!valid_lft || prefered_lft > valid_lft)
2443 return -EINVAL;
2444
53bd6749
JP		 2445 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2446 return -EINVAL;
2447
af284937
DL		 2448 dev = __dev_get_by_index(net, ifindex);
2449 if (!dev)
1da177e4 2450 return -ENODEV;
1ab1457c 2451
64e724f6
BH		 2452 idev = addrconf_add_dev(dev);
2453 if (IS_ERR(idev))
2454 return PTR_ERR(idev);
1da177e4
LT		 2455
2456 scope = ipv6_addr_scope(pfx);
2457
4bed72e4
YH		 2458 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2459 if (addrconf_finite_timeout(timeout)) {
2460 expires = jiffies_to_clock_t(timeout * HZ);
2461 valid_lft = timeout;
6f704992 2462 flags = RTF_EXPIRES;
4bed72e4
YH		 2463 } else {
2464 expires = 0;
2465 flags = 0;
2466 ifa_flags |= IFA_F_PERMANENT;
6f704992 2467 }
0778769d 2468
4bed72e4
YH		 2469 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2470 if (addrconf_finite_timeout(timeout)) {
2471 if (timeout == 0)
2472 ifa_flags |= IFA_F_DEPRECATED;
2473 prefered_lft = timeout;
2474 }
0778769d 2475
8a226b2c
JB		 2476 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2477 valid_lft, prefered_lft);
0778769d 2478
1da177e4 2479 if (!IS_ERR(ifp)) {
761aac73
TH		 2480 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2481 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2482 expires, flags);
2483 }
2484
95c385b4
NH		 2485 /*
2486 * Note that section 3.1 of RFC 4429 indicates
2487 * that the Optimistic flag should not be set for
2488 * manually configured addresses
2489 */
cf22f9a2 2490 addrconf_dad_start(ifp);
53bd6749
JP		 2491 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2492 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2493 true, jiffies);
1da177e4 2494 in6_ifa_put(ifp);
c15b1cca 2495 addrconf_verify_rtnl();
1da177e4
LT		 2496 return 0;
2497 }
2498
2499 return PTR_ERR(ifp);
2500}
2501
6046d5b4
HK		 2502static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2503 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2504{
2505 struct inet6_ifaddr *ifp;
2506 struct inet6_dev *idev;
2507 struct net_device *dev;
1ab1457c 2508
24ef0da7
TG		 2509 if (plen > 128)
2510 return -EINVAL;
2511
af284937
DL		 2512 dev = __dev_get_by_index(net, ifindex);
2513 if (!dev)
1da177e4
LT		 2514 return -ENODEV;
2515
7eaa48a4 2516 if ((idev = __in6_dev_get(dev)) == NULL)
1da177e4
LT		 2517 return -ENXIO;
2518
2519 read_lock_bh(&idev->lock);
502a2ffd 2520 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2521 if (ifp->prefix_len == plen &&
2522 ipv6_addr_equal(pfx, &ifp->addr)) {
2523 in6_ifa_hold(ifp);
2524 read_unlock_bh(&idev->lock);
1ab1457c 2525
6046d5b4
HK		 2526 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2527 (ifa_flags & IFA_F_MANAGETEMPADDR))
2528 manage_tempaddrs(idev, ifp, 0, 0, false,
2529 jiffies);
1da177e4 2530 ipv6_del_addr(ifp);
6046d5b4 2531 addrconf_verify_rtnl();
1da177e4
LT		 2532 return 0;
2533 }
2534 }
2535 read_unlock_bh(&idev->lock);
2536 return -EADDRNOTAVAIL;
2537}
2538
2539
af284937 2540int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2541{
2542 struct in6_ifreq ireq;
2543 int err;
1ab1457c 2544
af31f412 2545 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2546 return -EPERM;
1ab1457c 2547
1da177e4
LT		 2548 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2549 return -EFAULT;
2550
2551 rtnl_lock();
caeaba79 2552 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2553 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2554 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2555 rtnl_unlock();
2556 return err;
2557}
2558
af284937 2559int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2560{
2561 struct in6_ifreq ireq;
2562 int err;
1ab1457c 2563
af31f412 2564 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2565 return -EPERM;
2566
2567 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2568 return -EFAULT;
2569
2570 rtnl_lock();
6046d5b4 2571 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2572 ireq.ifr6_prefixlen);
1da177e4
LT		 2573 rtnl_unlock();
2574 return err;
2575}
2576
b5f348e5
IJ		 2577static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2578 int plen, int scope)
2579{
2580 struct inet6_ifaddr *ifp;
2581
8a226b2c 2582 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2583 scope, IFA_F_PERMANENT,
2584 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2585 if (!IS_ERR(ifp)) {
2586 spin_lock_bh(&ifp->lock);
2587 ifp->flags &= ~IFA_F_TENTATIVE;
2588 spin_unlock_bh(&ifp->lock);
2589 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2590 in6_ifa_put(ifp);
2591 }
2592}
2593
07a93626 2594#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2595static void sit_add_v4_addrs(struct inet6_dev *idev)
2596{
1da177e4
LT		 2597 struct in6_addr addr;
2598 struct net_device *dev;
c346dca1 2599 struct net *net = dev_net(idev->dev);
929c9cf3 2600 int scope, plen;
f0e2acfa 2601 u32 pflags = 0;
1da177e4
LT		 2602
2603 ASSERT_RTNL();
2604
2605 memset(&addr, 0, sizeof(struct in6_addr));
2606 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2607
2608 if (idev->dev->flags&IFF_POINTOPOINT) {
2609 addr.s6_addr32[0] = htonl(0xfe800000);
2610 scope = IFA_LINK;
929c9cf3 2611 plen = 64;
1da177e4
LT		 2612 } else {
2613 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2614 plen = 96;
f0e2acfa 2615 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2616 }
2617
2618 if (addr.s6_addr32[3]) {
929c9cf3 2619 add_addr(idev, &addr, plen, scope);
f0e2acfa 2620 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2621 return;
2622 }
2623
6fda7350 2624 for_each_netdev(net, dev) {
8e5e8f30 2625 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2626 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2627 struct in_ifaddr *ifa;
1da177e4
LT		 2628
2629 int flag = scope;
2630
2631 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2632
2633 addr.s6_addr32[3] = ifa->ifa_local;
2634
2635 if (ifa->ifa_scope == RT_SCOPE_LINK)
2636 continue;
2637 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2638 if (idev->dev->flags&IFF_POINTOPOINT)
2639 continue;
2640 flag |= IFA_HOST;
2641 }
1da177e4 2642
b5f348e5 2643 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2644 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2645 pflags);
1da177e4
LT		 2646 }
2647 }
1ab1457c 2648 }
1da177e4 2649}
0be669bb 2650#endif
1da177e4
LT		 2651
2652static void init_loopback(struct net_device *dev)
2653{
2654 struct inet6_dev *idev;
25fb6ca4
BK		 2655 struct net_device *sp_dev;
2656 struct inet6_ifaddr *sp_ifa;
2657 struct rt6_info *sp_rt;
1da177e4
LT		 2658
2659 /* ::1 */
2660
2661 ASSERT_RTNL();
2662
7eaa48a4 2663 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2664 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2665 return;
2666 }
2667
b5f348e5 2668 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2669
2670 /* Add routes to other interface's IPv6 addresses */
2671 for_each_netdev(dev_net(dev), sp_dev) {
2672 if (!strcmp(sp_dev->name, dev->name))
2673 continue;
2674
2675 idev = __in6_dev_get(sp_dev);
2676 if (!idev)
2677 continue;
2678
2679 read_lock_bh(&idev->lock);
2680 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2681
2682 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2683 continue;
2684
33d99113
G		 2685 if (sp_ifa->rt) {
2686 /* This dst has been added to garbage list when
2687 * lo device down, release this obsolete dst and
2688 * reallocate a new router for ifa.
2689 */
2690 if (sp_ifa->rt->dst.obsolete > 0) {
2691 ip6_rt_put(sp_ifa->rt);
2692 sp_ifa->rt = NULL;
2693 } else {
2694 continue;
2695 }
2696 }
a881ae1f 2697
57ec0afe 2698 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 2699
2700 /* Failure cases are ignored */
534c8779
G		 2701 if (!IS_ERR(sp_rt)) {
2702 sp_ifa->rt = sp_rt;
25fb6ca4 2703 ip6_ins_rt(sp_rt);
534c8779 2704 }
25fb6ca4
BK		 2705 }
2706 read_unlock_bh(&idev->lock);
2707 }
1da177e4
LT		 2708}
2709
b71d1d42 2710static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4 2711{
8e5e8f30 2712 struct inet6_ifaddr *ifp;
95c385b4
NH		 2713 u32 addr_flags = IFA_F_PERMANENT;
2714
2715#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2716 if (idev->cnf.optimistic_dad &&
702beb87 2717 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2718 addr_flags |= IFA_F_OPTIMISTIC;
2719#endif
1da177e4 2720
95c385b4 2721
07edd741
HFS		 2722 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2723 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 2724 if (!IS_ERR(ifp)) {
46d48046 2725 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2726 addrconf_dad_start(ifp);
1da177e4
LT		 2727 in6_ifa_put(ifp);
2728 }
2729}
2730
2731static void addrconf_dev_config(struct net_device *dev)
2732{
2733 struct in6_addr addr;
8e5e8f30 2734 struct inet6_dev *idev;
1da177e4
LT		 2735
2736 ASSERT_RTNL();
2737
74235a25
HX		 2738 if ((dev->type != ARPHRD_ETHER) &&
2739 (dev->type != ARPHRD_FDDI) &&
74235a25 2740 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 2741 (dev->type != ARPHRD_INFINIBAND) &&
cb6bf355 2742 (dev->type != ARPHRD_IEEE802154) &&
e837735e 2743 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8
JR		 2744 (dev->type != ARPHRD_TUNNEL6) &&
2745 (dev->type != ARPHRD_6LOWPAN)) {
74235a25
HX		 2746 /* Alas, we support only Ethernet autoconfiguration. */
2747 return;
2748 }
2749
1da177e4 2750 idev = addrconf_add_dev(dev);
64e724f6 2751 if (IS_ERR(idev))
1da177e4
LT		 2752 return;
2753
2754 memset(&addr, 0, sizeof(struct in6_addr));
2755 addr.s6_addr32[0] = htonl(0xFE800000);
2756
2757 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2758 addrconf_add_linklocal(idev, &addr);
2759}
2760
07a93626 2761#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2762static void addrconf_sit_config(struct net_device *dev)
2763{
2764 struct inet6_dev *idev;
2765
2766 ASSERT_RTNL();
2767
1ab1457c
YH		 2768 /*
2769 * Configure the tunnel with one of our IPv4
2770 * addresses... we should configure all of
1da177e4
LT		 2771 * our v4 addrs in the tunnel
2772 */
2773
7eaa48a4 2774 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2775 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2776 return;
2777 }
2778
c7dc89c0
FT		 2779 if (dev->priv_flags & IFF_ISATAP) {
2780 struct in6_addr addr;
2781
2782 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
c7dc89c0
FT		 2783 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2784 addrconf_add_linklocal(idev, &addr);
2785 return;
2786 }
2787
1da177e4
LT		 2788 sit_add_v4_addrs(idev);
2789
62b54dd9 2790 if (dev->flags&IFF_POINTOPOINT)
1da177e4 2791 addrconf_add_mroute(dev);
1da177e4 2792}
0be669bb 2793#endif
1da177e4 2794
07a93626 2795#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2796static void addrconf_gre_config(struct net_device *dev)
2797{
2798 struct inet6_dev *idev;
2799 struct in6_addr addr;
2800
aee80b54 2801 ASSERT_RTNL();
2802
7eaa48a4 2803 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2804 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 2805 return;
2806 }
2807
2808 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
aee80b54 2809 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2810 addrconf_add_linklocal(idev, &addr);
08b44656
ND		 2811 else
2812 addrconf_prefix_route(&addr, 64, dev, 0, 0);
aee80b54 2813}
2814#endif
2815
1ab1457c 2816static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 2817 void *ptr)
1da177e4 2818{
351638e7 2819 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 2820 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2821 int run_pending = 0;
b217d616 2822 int err;
1da177e4 2823
e21e8467 2824 switch (event) {
45ba9dd2 2825 case NETDEV_REGISTER:
74235a25 2826 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2827 idev = ipv6_add_dev(dev);
2828 if (!idev)
b217d616 2829 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2830 }
2831 break;
bcdd553f 2832
1da177e4 2833 case NETDEV_UP:
3c21edbd 2834 case NETDEV_CHANGE:
c2edacf8
JV		 2835 if (dev->flags & IFF_SLAVE)
2836 break;
2837
3c21edbd 2838 if (event == NETDEV_UP) {
f24e3d65 2839 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 2840 /* device is not ready yet. */
f3213831 2841 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 2842 dev->name);
2843 break;
2844 }
99081049 2845
d31c7b8f
EP		 2846 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2847 idev = ipv6_add_dev(dev);
2848
e3ec6cfc 2849 if (idev) {
99081049 2850 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2851 run_pending = 1;
2852 }
3c21edbd 2853 } else {
f24e3d65 2854 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2855 /* device is still not ready. */
2856 break;
2857 }
2858
2859 if (idev) {
bcdd553f 2860 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2861 /* device is already configured. */
2862 break;
3c21edbd
YH		 2863 idev->if_flags |= IF_READY;
2864 }
2865
f3213831
JP		 2866 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2867 dev->name);
3c21edbd 2868
c5e33bdd 2869 run_pending = 1;
3c21edbd
YH		 2870 }
2871
e21e8467 2872 switch (dev->type) {
07a93626 2873#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2874 case ARPHRD_SIT:
2875 addrconf_sit_config(dev);
2876 break;
aee80b54 2877#endif
07a93626 2878#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2879 case ARPHRD_IPGRE:
2880 addrconf_gre_config(dev);
2881 break;
0be669bb 2882#endif
1da177e4
LT		 2883 case ARPHRD_LOOPBACK:
2884 init_loopback(dev);
2885 break;
2886
2887 default:
2888 addrconf_dev_config(dev);
2889 break;
3ff50b79 2890 }
bcdd553f 2891
1da177e4 2892 if (idev) {
c5e33bdd
YH		 2893 if (run_pending)
2894 addrconf_dad_run(idev);
2895
bcdd553f
SH		 2896 /*
2897 * If the MTU changed during the interface down,
2898 * when the interface up, the changed MTU must be
2899 * reflected in the idev as well as routers.
1da177e4 2900 */
bcdd553f
SH		 2901 if (idev->cnf.mtu6 != dev->mtu &&
2902 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2903 rt6_mtu_change(dev, dev->mtu);
2904 idev->cnf.mtu6 = dev->mtu;
2905 }
2906 idev->tstamp = jiffies;
2907 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2908
2909 /*
2910 * If the changed mtu during down is lower than
2911 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2912 */
2913 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2914 addrconf_ifdown(dev, 1);
1da177e4
LT		 2915 }
2916 break;
2917
2918 case NETDEV_CHANGEMTU:
d31c7b8f 2919 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2920 rt6_mtu_change(dev, dev->mtu);
2921 idev->cnf.mtu6 = dev->mtu;
2922 break;
2923 }
2924
d31c7b8f
EP		 2925 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2926 idev = ipv6_add_dev(dev);
2927 if (idev)
2928 break;
2929 }
2930
bcdd553f 2931 /*
db9c7c39 2932 * if MTU under IPV6_MIN_MTU.
bcdd553f
SH		 2933 * Stop IPv6 on this interface.
2934 */
1da177e4
LT		 2935
2936 case NETDEV_DOWN:
2937 case NETDEV_UNREGISTER:
2938 /*
2939 * Remove all addresses from this interface.
2940 */
2941 addrconf_ifdown(dev, event != NETDEV_DOWN);
2942 break;
3c21edbd 2943
1da177e4 2944 case NETDEV_CHANGENAME:
1da177e4 2945 if (idev) {
5632c515 2946 snmp6_unregister_dev(idev);
408c4768 2947 addrconf_sysctl_unregister(idev);
f52295a9 2948 addrconf_sysctl_register(idev);
b217d616
HX		 2949 err = snmp6_register_dev(idev);
2950 if (err)
2951 return notifier_from_errno(err);
5632c515 2952 }
1da177e4 2953 break;
bcdd553f 2954
93d9b7d7
JP		 2955 case NETDEV_PRE_TYPE_CHANGE:
2956 case NETDEV_POST_TYPE_CHANGE:
2957 addrconf_type_change(dev, event);
75c78500 2958 break;
3ff50b79 2959 }
1da177e4
LT		 2960
2961 return NOTIFY_OK;
2962}
2963
2964/*
2965 * addrconf module should be notified of a device going up
2966 */
2967static struct notifier_block ipv6_dev_notf = {
2968 .notifier_call = addrconf_notify,
1da177e4
LT		 2969};
2970
93d9b7d7 2971static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2972{
2973 struct inet6_dev *idev;
2974 ASSERT_RTNL();
2975
2976 idev = __in6_dev_get(dev);
2977
93d9b7d7 2978 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2979 ipv6_mc_remap(idev);
93d9b7d7 2980 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2981 ipv6_mc_unmap(idev);
2982}
2983
1da177e4
LT		 2984static int addrconf_ifdown(struct net_device *dev, int how)
2985{
c346dca1 2986 struct net *net = dev_net(dev);
502a2ffd 2987 struct inet6_dev *idev;
2988 struct inet6_ifaddr *ifa;
73a8bd74 2989 int state, i;
1da177e4
LT		 2990
2991 ASSERT_RTNL();
2992
73a8bd74
DM		 2993 rt6_ifdown(net, dev);
2994 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 2995
2996 idev = __in6_dev_get(dev);
2997 if (idev == NULL)
2998 return -ENODEV;
2999
bcdd553f
SH		 3000 /*
3001 * Step 1: remove reference to ipv6 device from parent device.
3002 * Do not dev_put!
1da177e4 3003 */
439e2385 3004 if (how) {
1da177e4 3005 idev->dead = 1;
8814c4b5
YH		 3006
3007 /* protected by rtnl_lock */
a9b3cd7f 3008 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3009
3010 /* Step 1.5: remove snmp6 entry */
3011 snmp6_unregister_dev(idev);
3012
3013 }
3014
73a8bd74
DM		 3015 /* Step 2: clear hash table */
3016 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3017 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3018
3019 spin_lock_bh(&addrconf_hash_lock);
3020 restart:
b67bfe0d 3021 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74
DM		 3022 if (ifa->idev == idev) {
3023 hlist_del_init_rcu(&ifa->addr_lst);
c15b1cca 3024 addrconf_del_dad_work(ifa);
73a8bd74
DM		 3025 goto restart;
3026 }
3027 }
3028 spin_unlock_bh(&addrconf_hash_lock);
3029 }
3030
1da177e4
LT		 3031 write_lock_bh(&idev->lock);
3032
b7b1bfce
HFS		 3033 addrconf_del_rs_timer(idev);
3034
bcdd553f 3035 /* Step 2: clear flags for stateless addrconf */
439e2385 3036 if (!how)
3c21edbd 3037 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3038
439e2385 3039 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 3040 in6_dev_put(idev);
3041
bcdd553f 3042 /* Step 3: clear tempaddr list */
372e6c8f 3043 while (!list_empty(&idev->tempaddr_list)) {
3044 ifa = list_first_entry(&idev->tempaddr_list,
3045 struct inet6_ifaddr, tmp_list);
3046 list_del(&ifa->tmp_list);
1da177e4
LT		 3047 write_unlock_bh(&idev->lock);
3048 spin_lock_bh(&ifa->lock);
3049
3050 if (ifa->ifpub) {
3051 in6_ifa_put(ifa->ifpub);
3052 ifa->ifpub = NULL;
3053 }
3054 spin_unlock_bh(&ifa->lock);
3055 in6_ifa_put(ifa);
3056 write_lock_bh(&idev->lock);
3057 }
8f37ada5 3058
502a2ffd 3059 while (!list_empty(&idev->addr_list)) {
3060 ifa = list_first_entry(&idev->addr_list,
3061 struct inet6_ifaddr, if_list);
c15b1cca 3062 addrconf_del_dad_work(ifa);
84e8b803 3063
73a8bd74 3064 list_del(&ifa->if_list);
84e8b803 3065
73a8bd74 3066 write_unlock_bh(&idev->lock);
84e8b803 3067
73a8bd74
DM		 3068 spin_lock_bh(&ifa->state_lock);
3069 state = ifa->state;
3070 ifa->state = INET6_IFADDR_STATE_DEAD;
3071 spin_unlock_bh(&ifa->state_lock);
9d82ca98 3072
73a8bd74
DM		 3073 if (state != INET6_IFADDR_STATE_DEAD) {
3074 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3075 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 3076 }
73a8bd74 3077 in6_ifa_put(ifa);
8f37ada5 3078
73a8bd74
DM		 3079 write_lock_bh(&idev->lock);
3080 }
8f37ada5 3081
1da177e4
LT		 3082 write_unlock_bh(&idev->lock);
3083
3084 /* Step 5: Discard multicast list */
439e2385 3085 if (how)
1da177e4
LT		 3086 ipv6_mc_destroy_dev(idev);
3087 else
3088 ipv6_mc_down(idev);
3089
1da177e4 3090 idev->tstamp = jiffies;
1ab1457c 3091
bcdd553f 3092 /* Last: Shot the device (if unregistered) */
439e2385 3093 if (how) {
408c4768 3094 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3095 neigh_parms_release(&nd_tbl, idev->nd_parms);
3096 neigh_ifdown(&nd_tbl, dev);
3097 in6_dev_put(idev);
3098 }
3099 return 0;
3100}
3101
3102static void addrconf_rs_timer(unsigned long data)
3103{
b7b1bfce 3104 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3105 struct net_device *dev = idev->dev;
b7b1bfce 3106 struct in6_addr lladdr;
1da177e4 3107
b7b1bfce 3108 write_lock(&idev->lock);
5b2a1953 3109 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3110 goto out;
3111
9ba2add3 3112 if (!ipv6_accept_ra(idev))
5b2a1953 3113 goto out;
3114
3115 /* Announcement received after solicitation was sent */
3116 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3117 goto out;
1da177e4 3118
b7b1bfce 3119 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
caf92bc4
CW		 3120 write_unlock(&idev->lock);
3121 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3122 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3123 &in6addr_linklocal_allrouters);
3124 else
caf92bc4 3125 goto put;
1da177e4 3126
caf92bc4 3127 write_lock(&idev->lock);
b7b1bfce
HFS		 3128 /* The wait after the last probe can be shorter */
3129 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3130 idev->cnf.rtr_solicits) ?
3131 idev->cnf.rtr_solicit_delay :
3132 idev->cnf.rtr_solicit_interval);
1da177e4 3133 } else {
1da177e4
LT		 3134 /*
3135 * Note: we do not support deprecated "all on-link"
3136 * assumption any longer.
3137 */
91df42be 3138 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3139 }
3140
3141out:
b7b1bfce 3142 write_unlock(&idev->lock);
caf92bc4 3143put:
b7b1bfce 3144 in6_dev_put(idev);
1da177e4
LT		 3145}
3146
3147/*
3148 * Duplicate Address Detection
3149 */
3c21edbd
YH		 3150static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3151{
3152 unsigned long rand_num;
3153 struct inet6_dev *idev = ifp->idev;
3154
95c385b4
NH		 3155 if (ifp->flags & IFA_F_OPTIMISTIC)
3156 rand_num = 0;
3157 else
63862b5b 3158 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3159
b7b1bfce 3160 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3161 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3162}
3163
c15b1cca 3164static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3165{
3166 struct inet6_dev *idev = ifp->idev;
3167 struct net_device *dev = idev->dev;
1da177e4
LT		 3168
3169 addrconf_join_solict(dev, &ifp->addr);
3170
63862b5b 3171 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3172
3173 read_lock_bh(&idev->lock);
622ccdf1 3174 spin_lock(&ifp->lock);
e9d3e084 3175 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3176 goto out;
1da177e4
LT		 3177
3178 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3179 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3180 !(ifp->flags&IFA_F_TENTATIVE) ||
3181 ifp->flags & IFA_F_NODAD) {
cc411d0b 3182 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3183 spin_unlock(&ifp->lock);
1da177e4
LT		 3184 read_unlock_bh(&idev->lock);
3185
3186 addrconf_dad_completed(ifp);
3187 return;
3188 }
3189
6732bade 3190 if (!(idev->if_flags & IF_READY)) {
21809faf 3191 spin_unlock(&ifp->lock);
6732bade 3192 read_unlock_bh(&idev->lock);
3c21edbd 3193 /*
590a9887 3194 * If the device is not ready:
3c21edbd
YH		 3195 * - keep it tentative if it is a permanent address.
3196 * - otherwise, kill it.
3197 */
3198 in6_ifa_hold(ifp);
cc411d0b 3199 addrconf_dad_stop(ifp, 0);
6732bade 3200 return;
3c21edbd 3201 }
95c385b4
NH		 3202
3203 /*
3204 * Optimistic nodes can start receiving
3205 * Frames right away
3206 */
e21e8467 3207 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 3208 ip6_ins_rt(ifp->rt);
3209
6732bade 3210 addrconf_dad_kick(ifp);
1da177e4 3211out:
622ccdf1 3212 spin_unlock(&ifp->lock);
1da177e4
LT		 3213 read_unlock_bh(&idev->lock);
3214}
3215
c15b1cca 3216static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3217{
c15b1cca
HFS		 3218 bool begin_dad = false;
3219
3220 spin_lock_bh(&ifp->state_lock);
3221 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3222 ifp->state = INET6_IFADDR_STATE_PREDAD;
3223 begin_dad = true;
3224 }
3225 spin_unlock_bh(&ifp->state_lock);
3226
3227 if (begin_dad)
3228 addrconf_mod_dad_work(ifp, 0);
3229}
3230
3231static void addrconf_dad_work(struct work_struct *w)
3232{
3233 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3234 struct inet6_ifaddr,
3235 dad_work);
1da177e4 3236 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3237 struct in6_addr mcaddr;
3238
c15b1cca
HFS		 3239 enum {
3240 DAD_PROCESS,
3241 DAD_BEGIN,
3242 DAD_ABORT,
3243 } action = DAD_PROCESS;
3244
3245 rtnl_lock();
3246
3247 spin_lock_bh(&ifp->state_lock);
3248 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3249 action = DAD_BEGIN;
3250 ifp->state = INET6_IFADDR_STATE_DAD;
3251 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3252 action = DAD_ABORT;
3253 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3254 }
3255 spin_unlock_bh(&ifp->state_lock);
3256
3257 if (action == DAD_BEGIN) {
3258 addrconf_dad_begin(ifp);
3259 goto out;
3260 } else if (action == DAD_ABORT) {
3261 addrconf_dad_stop(ifp, 1);
3262 goto out;
3263 }
3264
b7b1bfce 3265 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3266 goto out;
3267
c15b1cca 3268 write_lock_bh(&idev->lock);
122e4519 3269 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3270 write_unlock_bh(&idev->lock);
1da177e4
LT		 3271 goto out;
3272 }
21809faf 3273
3274 spin_lock(&ifp->lock);
622ccdf1
HX		 3275 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3276 spin_unlock(&ifp->lock);
c15b1cca 3277 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3278 goto out;
3279 }
3280
b7b1bfce 3281 if (ifp->dad_probes == 0) {
1da177e4
LT		 3282 /*
3283 * DAD was successful
3284 */
3285
cc411d0b 3286 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3287 spin_unlock(&ifp->lock);
c15b1cca 3288 write_unlock_bh(&idev->lock);
1da177e4
LT		 3289
3290 addrconf_dad_completed(ifp);
3291
3292 goto out;
3293 }
3294
b7b1bfce 3295 ifp->dad_probes--;
c15b1cca
HFS		 3296 addrconf_mod_dad_work(ifp,
3297 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3298 spin_unlock(&ifp->lock);
c15b1cca 3299 write_unlock_bh(&idev->lock);
1da177e4
LT		 3300
3301 /* send a neighbour solicitation for our addr */
1da177e4 3302 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3303 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3304out:
3305 in6_ifa_put(ifp);
c15b1cca 3306 rtnl_unlock();
1da177e4
LT		 3307}
3308
11ffff75
HFS		 3309/* ifp->idev must be at least read locked */
3310static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3311{
3312 struct inet6_ifaddr *ifpiter;
3313 struct inet6_dev *idev = ifp->idev;
3314
602582ca
HFS		 3315 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3316 if (ifpiter->scope > IFA_LINK)
3317 break;
11ffff75
HFS		 3318 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3319 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3320 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3321 IFA_F_PERMANENT)
3322 return false;
3323 }
3324 return true;
3325}
3326
1da177e4
LT		 3327static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3328{
e21e8467 3329 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3330 struct in6_addr lladdr;
b173ee48 3331 bool send_rs, send_mld;
b7b1bfce 3332
c15b1cca 3333 addrconf_del_dad_work(ifp);
1da177e4
LT		 3334
3335 /*
3336 * Configure the address for reception. Now it is valid.
3337 */
3338
3339 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3340
026359bc
TA		 3341 /* If added prefix is link local and we are prepared to process
3342 router advertisements, start sending router solicitations.
1da177e4
LT		 3343 */
3344
1ec047eb 3345 read_lock_bh(&ifp->idev->lock);
11ffff75 3346 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 3347 send_rs = send_mld &&
3348 ipv6_accept_ra(ifp->idev) &&
1ec047eb 3349 ifp->idev->cnf.rtr_solicits > 0 &&
b173ee48 3350 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 3351 read_unlock_bh(&ifp->idev->lock);
3352
b173ee48
HFS		 3353 /* While dad is in progress mld report's source address is in6_addrany.
3354 * Resend with proper ll now.
3355 */
3356 if (send_mld)
3357 ipv6_mc_dad_complete(ifp->idev);
3358
1ec047eb 3359 if (send_rs) {
1da177e4
LT		 3360 /*
3361 * If a host as already performed a random delay
3362 * [...] as part of DAD [...] there is no need
3363 * to delay again before sending the first RS
3364 */
1ec047eb 3365 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 3366 return;
1ec047eb 3367 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 3368
b7b1bfce
HFS		 3369 write_lock_bh(&ifp->idev->lock);
3370 spin_lock(&ifp->lock);
3371 ifp->idev->rs_probes = 1;
1da177e4 3372 ifp->idev->if_flags |= IF_RS_SENT;
b7b1bfce
HFS		 3373 addrconf_mod_rs_timer(ifp->idev,
3374 ifp->idev->cnf.rtr_solicit_interval);
3375 spin_unlock(&ifp->lock);
3376 write_unlock_bh(&ifp->idev->lock);
1da177e4
LT		 3377 }
3378}
3379
e21e8467
SH		 3380static void addrconf_dad_run(struct inet6_dev *idev)
3381{
c5e33bdd
YH		 3382 struct inet6_ifaddr *ifp;
3383
3384 read_lock_bh(&idev->lock);
502a2ffd 3385 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3386 spin_lock(&ifp->lock);
f2344a13
HX		 3387 if (ifp->flags & IFA_F_TENTATIVE &&
3388 ifp->state == INET6_IFADDR_STATE_DAD)
3389 addrconf_dad_kick(ifp);
21809faf 3390 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3391 }
3392 read_unlock_bh(&idev->lock);
3393}
3394
1da177e4
LT		 3395#ifdef CONFIG_PROC_FS
3396struct if6_iter_state {
3c40090a 3397 struct seq_net_private p;
1da177e4 3398 int bucket;
1d578303 3399 int offset;
1da177e4
LT		 3400};
3401
1d578303 3402static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3403{
3404 struct inet6_ifaddr *ifa = NULL;
3405 struct if6_iter_state *state = seq->private;
1218854a 3406 struct net *net = seq_file_net(seq);
1d578303 3407 int p = 0;
1da177e4 3408
1d578303
MM		 3409 /* initial bucket if pos is 0 */
3410 if (pos == 0) {
3411 state->bucket = 0;
3412 state->offset = 0;
3413 }
3414
3415 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3416 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3417 addr_lst) {
9f0d3c27
ED		 3418 if (!net_eq(dev_net(ifa->idev->dev), net))
3419 continue;
1d578303
MM		 3420 /* sync with offset */
3421 if (p < state->offset) {
3422 p++;
3423 continue;
3424 }
3425 state->offset++;
9f0d3c27 3426 return ifa;
1d578303
MM		 3427 }
3428
3429 /* prepare for next bucket */
3430 state->offset = 0;
3431 p = 0;
1da177e4 3432 }
c2e21293 3433 return NULL;
1da177e4
LT		 3434}
3435
c2e21293 3436static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3437 struct inet6_ifaddr *ifa)
1da177e4
LT		 3438{
3439 struct if6_iter_state *state = seq->private;
1218854a 3440 struct net *net = seq_file_net(seq);
1da177e4 3441
b67bfe0d 3442 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3443 if (!net_eq(dev_net(ifa->idev->dev), net))
3444 continue;
1d578303 3445 state->offset++;
9f0d3c27 3446 return ifa;
1d578303 3447 }
3c40090a 3448
c2e21293 3449 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3450 state->offset = 0;
b67bfe0d 3451 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3452 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3453 if (!net_eq(dev_net(ifa->idev->dev), net))
3454 continue;
1d578303 3455 state->offset++;
9f0d3c27 3456 return ifa;
c2e21293 3457 }
1da177e4 3458 }
3c40090a 3459
c2e21293 3460 return NULL;
1da177e4
LT		 3461}
3462
1da177e4 3463static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3464 __acquires(rcu_bh)
1da177e4 3465{
5c578aed 3466 rcu_read_lock_bh();
1d578303 3467 return if6_get_first(seq, *pos);
1da177e4
LT		 3468}
3469
3470static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3471{
3472 struct inet6_ifaddr *ifa;
3473
3474 ifa = if6_get_next(seq, v);
3475 ++*pos;
3476 return ifa;
3477}
3478
3479static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3480 __releases(rcu_bh)
1da177e4 3481{
5c578aed 3482 rcu_read_unlock_bh();
1da177e4
LT		 3483}
3484
3485static int if6_seq_show(struct seq_file *seq, void *v)
3486{
3487 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 3488 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3489 &ifp->addr,
1da177e4
LT		 3490 ifp->idev->dev->ifindex,
3491 ifp->prefix_len,
3492 ifp->scope,
971a351c 3493 (u8) ifp->flags,
1da177e4
LT		 3494 ifp->idev->dev->name);
3495 return 0;
3496}
3497
56b3d975 3498static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3499 .start = if6_seq_start,
3500 .next = if6_seq_next,
3501 .show = if6_seq_show,
3502 .stop = if6_seq_stop,
3503};
3504
3505static int if6_seq_open(struct inode *inode, struct file *file)
3506{
3c40090a
DL		 3507 return seq_open_net(inode, file, &if6_seq_ops,
3508 sizeof(struct if6_iter_state));
1da177e4
LT		 3509}
3510
9a32144e 3511static const struct file_operations if6_fops = {
1da177e4
LT		 3512 .owner = THIS_MODULE,
3513 .open = if6_seq_open,
3514 .read = seq_read,
3515 .llseek = seq_lseek,
3c40090a 3516 .release = seq_release_net,
1da177e4
LT		 3517};
3518
2c8c1e72 3519static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3520{
d4beaa66 3521 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 3522 return -ENOMEM;
3523 return 0;
3524}
3525
2c8c1e72 3526static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 3527{
ece31ffd 3528 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 3529}
3530
3531static struct pernet_operations if6_proc_net_ops = {
3532 .init = if6_proc_net_init,
3533 .exit = if6_proc_net_exit,
3534};
3535
3536int __init if6_proc_init(void)
3537{
3538 return register_pernet_subsys(&if6_proc_net_ops);
3539}
3540
1da177e4
LT		 3541void if6_proc_exit(void)
3542{
3c40090a 3543 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3544}
3545#endif /* CONFIG_PROC_FS */
3546
07a93626 3547#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3548/* Check if address is a home address configured on any interface. */
b71d1d42 3549int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3550{
3551 int ret = 0;
c2e21293 3552 struct inet6_ifaddr *ifp = NULL;
ddbe5032 3553 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3554
5c578aed 3555 rcu_read_lock_bh();
b67bfe0d 3556 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 3557 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3558 continue;
caad295f 3559 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3560 (ifp->flags & IFA_F_HOMEADDRESS)) {
3561 ret = 1;
3562 break;
3563 }
3564 }
5c578aed 3565 rcu_read_unlock_bh();
3b9f9a1c
NT		 3566 return ret;
3567}
3568#endif
3569
1da177e4
LT		 3570/*
3571 * Periodic address status verification
3572 */
3573
c15b1cca 3574static void addrconf_verify_rtnl(void)
1da177e4 3575{
b2db7564 3576 unsigned long now, next, next_sec, next_sched;
1da177e4 3577 struct inet6_ifaddr *ifp;
1da177e4
LT		 3578 int i;
3579
c15b1cca
HFS		 3580 ASSERT_RTNL();
3581
5c578aed 3582 rcu_read_lock_bh();
1da177e4 3583 now = jiffies;
b2db7564 3584 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 3585
c15b1cca 3586 cancel_delayed_work(&addr_chk_work);
1da177e4 3587
bcdd553f 3588 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3589restart:
c15b1cca 3590 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 3591 unsigned long age;
1da177e4 3592
fad8da3e
YA		 3593 /* When setting preferred_lft to a value not zero or
3594 * infinity, while valid_lft is infinity
3595 * IFA_F_PERMANENT has a non-infinity life time.
3596 */
3597 if ((ifp->flags & IFA_F_PERMANENT) &&
3598 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 3599 continue;
3600
3601 spin_lock(&ifp->lock);
b2db7564
YH		 3602 /* We try to batch several events at once. */
3603 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3604
8f27ebb9
YH		 3605 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3606 age >= ifp->valid_lft) {
1da177e4
LT		 3607 spin_unlock(&ifp->lock);
3608 in6_ifa_hold(ifp);
1da177e4
LT		 3609 ipv6_del_addr(ifp);
3610 goto restart;
8f27ebb9
YH		 3611 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3612 spin_unlock(&ifp->lock);
3613 continue;
1da177e4 3614 } else if (age >= ifp->prefered_lft) {
a1ed0526 3615 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3616 int deprecate = 0;
3617
3618 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3619 deprecate = 1;
3620 ifp->flags |= IFA_F_DEPRECATED;
3621 }
3622
fad8da3e
YA		 3623 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3624 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 3625 next = ifp->tstamp + ifp->valid_lft * HZ;
3626
3627 spin_unlock(&ifp->lock);
3628
3629 if (deprecate) {
3630 in6_ifa_hold(ifp);
1da177e4
LT		 3631
3632 ipv6_ifa_notify(0, ifp);
3633 in6_ifa_put(ifp);
3634 goto restart;
3635 }
1da177e4
LT		 3636 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3637 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3638 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3639 ifp->idev->cnf.dad_transmits *
1f9248e5 3640 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 3641
1da177e4
LT		 3642 if (age >= ifp->prefered_lft - regen_advance) {
3643 struct inet6_ifaddr *ifpub = ifp->ifpub;
3644 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3645 next = ifp->tstamp + ifp->prefered_lft * HZ;
3646 if (!ifp->regen_count && ifpub) {
3647 ifp->regen_count++;
3648 in6_ifa_hold(ifp);
3649 in6_ifa_hold(ifpub);
3650 spin_unlock(&ifp->lock);
5c578aed 3651
291d809b
HY		 3652 spin_lock(&ifpub->lock);
3653 ifpub->regen_count = 0;
3654 spin_unlock(&ifpub->lock);
1da177e4
LT		 3655 ipv6_create_tempaddr(ifpub, ifp);
3656 in6_ifa_put(ifpub);
3657 in6_ifa_put(ifp);
3658 goto restart;
3659 }
3660 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3661 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3662 spin_unlock(&ifp->lock);
1da177e4
LT		 3663 } else {
3664 /* ifp->prefered_lft <= ifp->valid_lft */
3665 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3666 next = ifp->tstamp + ifp->prefered_lft * HZ;
3667 spin_unlock(&ifp->lock);
3668 }
3669 }
1da177e4
LT		 3670 }
3671
b2db7564
YH		 3672 next_sec = round_jiffies_up(next);
3673 next_sched = next;
3674
3675 /* If rounded timeout is accurate enough, accept it. */
3676 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3677 next_sched = next_sec;
3678
3679 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3680 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3681 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3682
ba3542e1 3683 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3684 now, next, next_sec, next_sched);
c15b1cca 3685 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 3686 rcu_read_unlock_bh();
1da177e4
LT		 3687}
3688
c15b1cca
HFS		 3689static void addrconf_verify_work(struct work_struct *w)
3690{
3691 rtnl_lock();
3692 addrconf_verify_rtnl();
3693 rtnl_unlock();
3694}
3695
3696static void addrconf_verify(void)
3697{
3698 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
3699}
3700
caeaba79
ND		 3701static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3702 struct in6_addr **peer_pfx)
461d8837
TG		 3703{
3704 struct in6_addr *pfx = NULL;
3705
caeaba79
ND		 3706 *peer_pfx = NULL;
3707
461d8837
TG		 3708 if (addr)
3709 pfx = nla_data(addr);
3710
3711 if (local) {
3712 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 3713 *peer_pfx = pfx;
3714 pfx = nla_data(local);
461d8837
TG		 3715 }
3716
3717 return pfx;
3718}
3719
ef7c79ed 3720static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3721 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3722 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3723 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 3724 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 3725};
3726
1da177e4 3727static int
661d2967 3728inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3729{
3b1e0a65 3730 struct net *net = sock_net(skb->sk);
b933f716
TG		 3731 struct ifaddrmsg *ifm;
3732 struct nlattr *tb[IFA_MAX+1];
caeaba79 3733 struct in6_addr *pfx, *peer_pfx;
6046d5b4 3734 u32 ifa_flags;
b933f716 3735 int err;
1da177e4 3736
b933f716
TG		 3737 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3738 if (err < 0)
3739 return err;
3740
3741 ifm = nlmsg_data(nlh);
caeaba79 3742 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3743 if (pfx == NULL)
3744 return -EINVAL;
3745
6046d5b4
HK		 3746 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3747
3748 /* We ignore other flags so far. */
3749 ifa_flags &= IFA_F_MANAGETEMPADDR;
3750
3751 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
3752 ifm->ifa_prefixlen);
1da177e4
LT		 3753}
3754
479840ff 3755static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 3756 u32 prefered_lft, u32 valid_lft)
081bba5b 3757{
6f704992
YH		 3758 u32 flags;
3759 clock_t expires;
4bed72e4 3760 unsigned long timeout;
53bd6749 3761 bool was_managetempaddr;
5b84efec 3762 bool had_prefixroute;
46d48046 3763
c15b1cca
HFS		 3764 ASSERT_RTNL();
3765
081bba5b
NT		 3766 if (!valid_lft || (prefered_lft > valid_lft))
3767 return -EINVAL;
3768
53bd6749
JP		 3769 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
3770 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
3771 return -EINVAL;
3772
4bed72e4
YH		 3773 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3774 if (addrconf_finite_timeout(timeout)) {
3775 expires = jiffies_to_clock_t(timeout * HZ);
3776 valid_lft = timeout;
6f704992 3777 flags = RTF_EXPIRES;
4bed72e4
YH		 3778 } else {
3779 expires = 0;
3780 flags = 0;
3781 ifa_flags |= IFA_F_PERMANENT;
6f704992 3782 }
081bba5b 3783
4bed72e4
YH		 3784 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3785 if (addrconf_finite_timeout(timeout)) {
3786 if (timeout == 0)
3787 ifa_flags |= IFA_F_DEPRECATED;
3788 prefered_lft = timeout;
3789 }
081bba5b
NT		 3790
3791 spin_lock_bh(&ifp->lock);
53bd6749 3792 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 3793 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
3794 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 3795 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 3796 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3797 IFA_F_NOPREFIXROUTE);
53bd6749 3798 ifp->flags |= ifa_flags;
081bba5b
NT		 3799 ifp->tstamp = jiffies;
3800 ifp->valid_lft = valid_lft;
3801 ifp->prefered_lft = prefered_lft;
3802
3803 spin_unlock_bh(&ifp->lock);
3804 if (!(ifp->flags&IFA_F_TENTATIVE))
3805 ipv6_ifa_notify(0, ifp);
081bba5b 3806
761aac73
TH		 3807 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
3808 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3809 expires, flags);
5b84efec
TH		 3810 } else if (had_prefixroute) {
3811 enum cleanup_prefix_rt_t action;
3812 unsigned long rt_expires;
3813
3814 write_lock_bh(&ifp->idev->lock);
3815 action = check_cleanup_prefix_route(ifp, &rt_expires);
3816 write_unlock_bh(&ifp->idev->lock);
3817
3818 if (action != CLEANUP_PREFIX_RT_NOP) {
3819 cleanup_prefix_route(ifp, rt_expires,
3820 action == CLEANUP_PREFIX_RT_DEL);
3821 }
761aac73 3822 }
53bd6749
JP		 3823
3824 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
3825 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
3826 valid_lft = prefered_lft = 0;
3827 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
3828 !was_managetempaddr, jiffies);
3829 }
3830
c15b1cca 3831 addrconf_verify_rtnl();
081bba5b
NT		 3832
3833 return 0;
3834}
3835
1da177e4 3836static int
661d2967 3837inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3838{
3b1e0a65 3839 struct net *net = sock_net(skb->sk);
461d8837
TG		 3840 struct ifaddrmsg *ifm;
3841 struct nlattr *tb[IFA_MAX+1];
caeaba79 3842 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 3843 struct inet6_ifaddr *ifa;
3844 struct net_device *dev;
55ebaef1 3845 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 3846 u32 ifa_flags;
461d8837 3847 int err;
1da177e4 3848
461d8837
TG		 3849 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3850 if (err < 0)
3851 return err;
3852
3853 ifm = nlmsg_data(nlh);
caeaba79 3854 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3855 if (pfx == NULL)
3856 return -EINVAL;
3857
461d8837 3858 if (tb[IFA_CACHEINFO]) {
0778769d 3859 struct ifa_cacheinfo *ci;
461d8837
TG		 3860
3861 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3862 valid_lft = ci->ifa_valid;
461d8837
TG		 3863 preferred_lft = ci->ifa_prefered;
3864 } else {
3865 preferred_lft = INFINITY_LIFE_TIME;
3866 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3867 }
3868
af284937 3869 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3870 if (dev == NULL)
3871 return -ENODEV;
3872
479840ff
JP		 3873 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3874
55ebaef1 3875 /* We ignore other flags so far. */
761aac73
TH		 3876 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3877 IFA_F_NOPREFIXROUTE;
55ebaef1 3878
1cab3da6 3879 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3880 if (ifa == NULL) {
3881 /*
3882 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 3883 * userspace already relies on not having to provide this.
7198f8ce 3884 */
caeaba79 3885 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 3886 ifm->ifa_prefixlen, ifa_flags,
3887 preferred_lft, valid_lft);
081bba5b
NT		 3888 }
3889
7198f8ce
TG		 3890 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3891 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3892 err = -EEXIST;
3893 else
55ebaef1 3894 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3895
3896 in6_ifa_put(ifa);
3897
3898 return err;
1da177e4
LT		 3899}
3900
479840ff 3901static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 3902 u8 scope, int ifindex)
3903{
3904 struct ifaddrmsg *ifm;
3905
3906 ifm = nlmsg_data(nlh);
3907 ifm->ifa_family = AF_INET6;
3908 ifm->ifa_prefixlen = prefixlen;
3909 ifm->ifa_flags = flags;
3910 ifm->ifa_scope = scope;
3911 ifm->ifa_index = ifindex;
3912}
3913
85486af0
TG		 3914static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3915 unsigned long tstamp, u32 preferred, u32 valid)
3916{
3917 struct ifa_cacheinfo ci;
3918
18a31e1e
TG		 3919 ci.cstamp = cstamp_delta(cstamp);
3920 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 3921 ci.ifa_prefered = preferred;
3922 ci.ifa_valid = valid;
3923
3924 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3925}
3926
101bb229
TG		 3927static inline int rt_scope(int ifa_scope)
3928{
3929 if (ifa_scope & IFA_HOST)
3930 return RT_SCOPE_HOST;
3931 else if (ifa_scope & IFA_LINK)
3932 return RT_SCOPE_LINK;
3933 else if (ifa_scope & IFA_SITE)
3934 return RT_SCOPE_SITE;
3935 else
3936 return RT_SCOPE_UNIVERSE;
3937}
3938
0ab6803b
TG		 3939static inline int inet6_ifaddr_msgsize(void)
3940{
339bf98f 3941 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 3942 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 3943 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 3944 + nla_total_size(sizeof(struct ifa_cacheinfo))
3945 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 3946}
c5396a31 3947
1da177e4 3948static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 3949 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3950{
1da177e4 3951 struct nlmsghdr *nlh;
85486af0 3952 u32 preferred, valid;
1da177e4 3953
15e47304 3954 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3955 if (nlh == NULL)
26932566 3956 return -EMSGSIZE;
0ab6803b 3957
101bb229
TG		 3958 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3959 ifa->idev->dev->ifindex);
3960
fad8da3e
YA		 3961 if (!((ifa->flags&IFA_F_PERMANENT) &&
3962 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 3963 preferred = ifa->prefered_lft;
3964 valid = ifa->valid_lft;
3965 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3966 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3967 if (preferred > tval)
3968 preferred -= tval;
3969 else
3970 preferred = 0;
f56619fc
BH		 3971 if (valid != INFINITY_LIFE_TIME) {
3972 if (valid > tval)
3973 valid -= tval;
3974 else
3975 valid = 0;
3976 }
1da177e4
LT		 3977 }
3978 } else {
85486af0
TG		 3979 preferred = INFINITY_LIFE_TIME;
3980 valid = INFINITY_LIFE_TIME;
3981 }
3982
7996c799 3983 if (!ipv6_addr_any(&ifa->peer_addr)) {
caeaba79
ND		 3984 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3985 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3986 goto error;
3987 } else
3988 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3989 goto error;
3990
3991 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3992 goto error;
1da177e4 3993
479840ff
JP		 3994 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
3995 goto error;
3996
0ab6803b 3997 return nlmsg_end(skb, nlh);
caeaba79
ND		 3998
3999error:
4000 nlmsg_cancel(skb, nlh);
4001 return -EMSGSIZE;
1da177e4
LT		 4002}
4003
4004static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4005 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4006{
1da177e4 4007 struct nlmsghdr *nlh;
101bb229
TG		 4008 u8 scope = RT_SCOPE_UNIVERSE;
4009 int ifindex = ifmca->idev->dev->ifindex;
4010
4011 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4012 scope = RT_SCOPE_SITE;
1da177e4 4013
15e47304 4014 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 4015 if (nlh == NULL)
26932566 4016 return -EMSGSIZE;
85486af0 4017
0ab6803b
TG		 4018 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4019 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
4020 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4021 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4022 nlmsg_cancel(skb, nlh);
4023 return -EMSGSIZE;
4024 }
85486af0 4025
0ab6803b 4026 return nlmsg_end(skb, nlh);
1da177e4
LT		 4027}
4028
4029static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4030 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4031{
1da177e4 4032 struct nlmsghdr *nlh;
101bb229
TG		 4033 u8 scope = RT_SCOPE_UNIVERSE;
4034 int ifindex = ifaca->aca_idev->dev->ifindex;
4035
4036 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4037 scope = RT_SCOPE_SITE;
1da177e4 4038
15e47304 4039 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 4040 if (nlh == NULL)
26932566 4041 return -EMSGSIZE;
85486af0 4042
0ab6803b
TG		 4043 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4044 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
4045 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4046 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4047 nlmsg_cancel(skb, nlh);
4048 return -EMSGSIZE;
4049 }
1da177e4 4050
0ab6803b 4051 return nlmsg_end(skb, nlh);
1da177e4
LT		 4052}
4053
e21e8467 4054enum addr_type_t {
1da177e4
LT		 4055 UNICAST_ADDR,
4056 MULTICAST_ADDR,
4057 ANYCAST_ADDR,
4058};
4059
234b27c3
ED		 4060/* called with rcu_read_lock() */
4061static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4062 struct netlink_callback *cb, enum addr_type_t type,
4063 int s_ip_idx, int *p_ip_idx)
4064{
234b27c3
ED		 4065 struct ifmcaddr6 *ifmca;
4066 struct ifacaddr6 *ifaca;
4067 int err = 1;
4068 int ip_idx = *p_ip_idx;
4069
4070 read_lock_bh(&idev->lock);
4071 switch (type) {
502a2ffd 4072 case UNICAST_ADDR: {
4073 struct inet6_ifaddr *ifa;
4074
234b27c3 4075 /* unicast address incl. temp addr */
502a2ffd 4076 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4077 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4078 continue;
4079 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4080 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4081 cb->nlh->nlmsg_seq,
4082 RTM_NEWADDR,
4083 NLM_F_MULTI);
4084 if (err <= 0)
4085 break;
63998ac2 4086 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4087 }
4088 break;
502a2ffd 4089 }
234b27c3
ED		 4090 case MULTICAST_ADDR:
4091 /* multicast address */
4092 for (ifmca = idev->mc_list; ifmca;
4093 ifmca = ifmca->next, ip_idx++) {
4094 if (ip_idx < s_ip_idx)
4095 continue;
4096 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4097 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4098 cb->nlh->nlmsg_seq,
4099 RTM_GETMULTICAST,
4100 NLM_F_MULTI);
4101 if (err <= 0)
4102 break;
4103 }
4104 break;
4105 case ANYCAST_ADDR:
4106 /* anycast address */
4107 for (ifaca = idev->ac_list; ifaca;
4108 ifaca = ifaca->aca_next, ip_idx++) {
4109 if (ip_idx < s_ip_idx)
4110 continue;
4111 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4112 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4113 cb->nlh->nlmsg_seq,
4114 RTM_GETANYCAST,
4115 NLM_F_MULTI);
4116 if (err <= 0)
4117 break;
4118 }
4119 break;
4120 default:
4121 break;
4122 }
4123 read_unlock_bh(&idev->lock);
4124 *p_ip_idx = ip_idx;
4125 return err;
4126}
4127
1da177e4
LT		 4128static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4129 enum addr_type_t type)
4130{
234b27c3
ED		 4131 struct net *net = sock_net(skb->sk);
4132 int h, s_h;
1da177e4
LT		 4133 int idx, ip_idx;
4134 int s_idx, s_ip_idx;
1da177e4 4135 struct net_device *dev;
234b27c3
ED		 4136 struct inet6_dev *idev;
4137 struct hlist_head *head;
1ab1457c 4138
234b27c3
ED		 4139 s_h = cb->args[0];
4140 s_idx = idx = cb->args[1];
4141 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4142
234b27c3 4143 rcu_read_lock();
63998ac2 4144 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4145 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4146 idx = 0;
4147 head = &net->dev_index_head[h];
b67bfe0d 4148 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4149 if (idx < s_idx)
4150 goto cont;
4b97efdf 4151 if (h > s_h || idx > s_idx)
234b27c3
ED		 4152 s_ip_idx = 0;
4153 ip_idx = 0;
e21e8467
SH		 4154 idev = __in6_dev_get(dev);
4155 if (!idev)
234b27c3
ED		 4156 goto cont;
4157
4158 if (in6_dump_addrs(idev, skb, cb, type,
4159 s_ip_idx, &ip_idx) <= 0)
4160 goto done;
7562f876 4161cont:
234b27c3
ED		 4162 idx++;
4163 }
1da177e4 4164 }
234b27c3
ED		 4165done:
4166 rcu_read_unlock();
4167 cb->args[0] = h;
4168 cb->args[1] = idx;
4169 cb->args[2] = ip_idx;
4170
1da177e4
LT		 4171 return skb->len;
4172}
4173
4174static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4175{
4176 enum addr_type_t type = UNICAST_ADDR;
b854272b 4177
1da177e4
LT		 4178 return inet6_dump_addr(skb, cb, type);
4179}
4180
4181static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4182{
4183 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4184
1da177e4
LT		 4185 return inet6_dump_addr(skb, cb, type);
4186}
4187
4188
4189static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4190{
4191 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4192
1da177e4
LT		 4193 return inet6_dump_addr(skb, cb, type);
4194}
4195
661d2967 4196static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4197{
3b1e0a65 4198 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4199 struct ifaddrmsg *ifm;
4200 struct nlattr *tb[IFA_MAX+1];
caeaba79 4201 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4202 struct net_device *dev = NULL;
4203 struct inet6_ifaddr *ifa;
4204 struct sk_buff *skb;
6c223828
NT		 4205 int err;
4206
1b29fc2c
TG		 4207 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4208 if (err < 0)
4209 goto errout;
4210
caeaba79 4211 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
1b29fc2c
TG		 4212 if (addr == NULL) {
4213 err = -EINVAL;
4214 goto errout;
6c223828 4215 }
6c223828 4216
1b29fc2c 4217 ifm = nlmsg_data(nlh);
6c223828 4218 if (ifm->ifa_index)
6fda7350 4219 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4220
e21e8467
SH		 4221 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4222 if (!ifa) {
1b29fc2c
TG		 4223 err = -EADDRNOTAVAIL;
4224 goto errout;
4225 }
6c223828 4226
e21e8467
SH		 4227 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4228 if (!skb) {
6c223828 4229 err = -ENOBUFS;
1b29fc2c 4230 goto errout_ifa;
6c223828
NT		 4231 }
4232
15e47304 4233 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4234 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4235 if (err < 0) {
4236 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4237 WARN_ON(err == -EMSGSIZE);
4238 kfree_skb(skb);
4239 goto errout_ifa;
4240 }
15e47304 4241 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4242errout_ifa:
6c223828 4243 in6_ifa_put(ifa);
1b29fc2c 4244errout:
6c223828 4245 return err;
6c223828
NT		 4246}
4247
1da177e4
LT		 4248static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4249{
4250 struct sk_buff *skb;
c346dca1 4251 struct net *net = dev_net(ifa->idev->dev);
5d620266 4252 int err = -ENOBUFS;
1da177e4 4253
0ab6803b 4254 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 4255 if (skb == NULL)
4256 goto errout;
4257
4258 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4259 if (err < 0) {
4260 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4261 WARN_ON(err == -EMSGSIZE);
4262 kfree_skb(skb);
4263 goto errout;
4264 }
1ce85fe4
PNA		 4265 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4266 return;
5d620266
TG		 4267errout:
4268 if (err < 0)
6fda7350 4269 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4270}
4271
b6f99a21 4272static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4273 __s32 *array, int bytes)
4274{
04561c1f
TG		 4275 BUG_ON(bytes < (DEVCONF_MAX * 4));
4276
1da177e4
LT		 4277 memset(array, 0, bytes);
4278 array[DEVCONF_FORWARDING] = cnf->forwarding;
4279 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4280 array[DEVCONF_MTU6] = cnf->mtu6;
4281 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4282 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4283 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4284 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4285 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4286 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4287 jiffies_to_msecs(cnf->rtr_solicit_interval);
4288 array[DEVCONF_RTR_SOLICIT_DELAY] =
4289 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4290 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4291 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4292 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4293 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4294 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4295 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4296 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4297 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4298 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4299 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4300 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4301 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 4302 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4303#ifdef CONFIG_IPV6_ROUTER_PREF
4304 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4305 array[DEVCONF_RTR_PROBE_INTERVAL] =
4306 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4307#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4308 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4309#endif
930d6ff2 4310#endif
fbea49e1 4311 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4312 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4313#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4314 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4315#endif
7bc570c8
YH		 4316#ifdef CONFIG_IPV6_MROUTE
4317 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4318#endif
778d80be 4319 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4320 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4321 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4322 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 4323 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
1da177e4
LT		 4324}
4325
b382b191
TG		 4326static inline size_t inet6_ifla6_size(void)
4327{
4328 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4329 + nla_total_size(sizeof(struct ifla_cacheinfo))
4330 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4331 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4332 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4333 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4334}
4335
339bf98f
TG		 4336static inline size_t inet6_if_nlmsg_size(void)
4337{
4338 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4339 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4340 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4341 + nla_total_size(4) /* IFLA_MTU */
4342 + nla_total_size(4) /* IFLA_LINK */
b382b191 4343 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4344}
c5396a31 4345
be281e55 4346static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4347 int items, int bytes)
7f7d9a6b
HX		 4348{
4349 int i;
4350 int pad = bytes - sizeof(u64) * items;
4351 BUG_ON(pad < 0);
4352
4353 /* Use put_unaligned() because stats may not be aligned for u64. */
4354 put_unaligned(items, &stats[0]);
4355 for (i = 1; i < items; i++)
be281e55 4356 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4357
4358 memset(&stats[items], 0, pad);
4359}
4360
698365fa 4361static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4ce3c183
ED		 4362 int items, int bytes, size_t syncpoff)
4363{
4364 int i;
4365 int pad = bytes - sizeof(u64) * items;
4366 BUG_ON(pad < 0);
4367
4368 /* Use put_unaligned() because stats may not be aligned for u64. */
4369 put_unaligned(items, &stats[0]);
4370 for (i = 1; i < items; i++)
4371 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4372
4373 memset(&stats[items], 0, pad);
4374}
4375
7f7d9a6b
HX		 4376static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4377 int bytes)
4378{
e21e8467 4379 switch (attrtype) {
7f7d9a6b 4380 case IFLA_INET6_STATS:
698365fa 4381 __snmp6_fill_stats64(stats, idev->stats.ipv6,
4ce3c183 4382 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4383 break;
4384 case IFLA_INET6_ICMP6STATS:
be281e55 4385 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4386 break;
4387 }
4388}
4389
b382b191
TG		 4390static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4391{
4392 struct nlattr *nla;
4393 struct ifla_cacheinfo ci;
4394
c78679e8
DM		 4395 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4396 goto nla_put_failure;
b382b191 4397 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4398 ci.tstamp = cstamp_delta(idev->tstamp);
4399 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 4400 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 4401 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4402 goto nla_put_failure;
b382b191
TG		 4403 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4404 if (nla == NULL)
4405 goto nla_put_failure;
4406 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4407
4408 /* XXX - MC not implemented */
4409
4410 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4411 if (nla == NULL)
4412 goto nla_put_failure;
4413 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4414
4415 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4416 if (nla == NULL)
4417 goto nla_put_failure;
4418 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4419
f53adae4
DB		 4420 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4421 if (nla == NULL)
4422 goto nla_put_failure;
4423 read_lock_bh(&idev->lock);
4424 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4425 read_unlock_bh(&idev->lock);
4426
b382b191
TG		 4427 return 0;
4428
4429nla_put_failure:
4430 return -EMSGSIZE;
4431}
4432
4433static size_t inet6_get_link_af_size(const struct net_device *dev)
4434{
4435 if (!__in6_dev_get(dev))
4436 return 0;
4437
4438 return inet6_ifla6_size();
4439}
4440
4441static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4442{
4443 struct inet6_dev *idev = __in6_dev_get(dev);
4444
4445 if (!idev)
4446 return -ENODATA;
4447
4448 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4449 return -EMSGSIZE;
4450
4451 return 0;
4452}
4453
f53adae4
DB		 4454static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4455{
f53adae4
DB		 4456 struct inet6_ifaddr *ifp;
4457 struct net_device *dev = idev->dev;
fc403832 4458 bool update_rs = false;
dc848292 4459 struct in6_addr ll_addr;
f53adae4 4460
c15b1cca
HFS		 4461 ASSERT_RTNL();
4462
f53adae4
DB		 4463 if (token == NULL)
4464 return -EINVAL;
4465 if (ipv6_addr_any(token))
4466 return -EINVAL;
4467 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4468 return -EINVAL;
f53adae4
DB		 4469 if (!ipv6_accept_ra(idev))
4470 return -EINVAL;
4471 if (idev->cnf.rtr_solicits <= 0)
4472 return -EINVAL;
4473
4474 write_lock_bh(&idev->lock);
4475
4476 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4477 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4478
4479 write_unlock_bh(&idev->lock);
4480
dc848292
HFS		 4481 if (!idev->dead && (idev->if_flags & IF_READY) &&
4482 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4483 IFA_F_OPTIMISTIC)) {
fc403832
DB		 4484
4485 /* If we're not ready, then normal ifup will take care
4486 * of this. Otherwise, we need to request our rs here.
4487 */
4488 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4489 update_rs = true;
4490 }
f53adae4
DB		 4491
4492 write_lock_bh(&idev->lock);
fc403832 4493
77ecaace 4494 if (update_rs) {
fc403832 4495 idev->if_flags |= IF_RS_SENT;
77ecaace
HFS		 4496 idev->rs_probes = 1;
4497 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4498 }
f53adae4
DB		 4499
4500 /* Well, that's kinda nasty ... */
4501 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4502 spin_lock(&ifp->lock);
617fe29d 4503 if (ifp->tokenized) {
f53adae4
DB		 4504 ifp->valid_lft = 0;
4505 ifp->prefered_lft = 0;
4506 }
4507 spin_unlock(&ifp->lock);
4508 }
4509
4510 write_unlock_bh(&idev->lock);
c15b1cca 4511 addrconf_verify_rtnl();
f53adae4
DB		 4512 return 0;
4513}
4514
4515static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4516{
4517 int err = -EINVAL;
4518 struct inet6_dev *idev = __in6_dev_get(dev);
4519 struct nlattr *tb[IFLA_INET6_MAX + 1];
4520
4521 if (!idev)
4522 return -EAFNOSUPPORT;
4523
4524 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4525 BUG();
4526
4527 if (tb[IFLA_INET6_TOKEN])
4528 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4529
4530 return err;
4531}
4532
1ab1457c 4533static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4534 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4535{
04561c1f 4536 struct net_device *dev = idev->dev;
04561c1f
TG		 4537 struct ifinfomsg *hdr;
4538 struct nlmsghdr *nlh;
4539 void *protoinfo;
04561c1f 4540
15e47304 4541 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
04561c1f 4542 if (nlh == NULL)
26932566 4543 return -EMSGSIZE;
04561c1f
TG		 4544
4545 hdr = nlmsg_data(nlh);
4546 hdr->ifi_family = AF_INET6;
4547 hdr->__ifi_pad = 0;
4548 hdr->ifi_type = dev->type;
4549 hdr->ifi_index = dev->ifindex;
4550 hdr->ifi_flags = dev_get_flags(dev);
4551 hdr->ifi_change = 0;
4552
c78679e8
DM		 4553 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4554 (dev->addr_len &&
4555 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4556 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4557 (dev->ifindex != dev->iflink &&
4558 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4559 goto nla_put_failure;
04561c1f
TG		 4560 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4561 if (protoinfo == NULL)
4562 goto nla_put_failure;
1da177e4 4563
b382b191 4564 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4565 goto nla_put_failure;
1da177e4 4566
04561c1f
TG		 4567 nla_nest_end(skb, protoinfo);
4568 return nlmsg_end(skb, nlh);
1da177e4 4569
04561c1f 4570nla_put_failure:
26932566
PM		 4571 nlmsg_cancel(skb, nlh);
4572 return -EMSGSIZE;
1da177e4
LT		 4573}
4574
4575static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4576{
3b1e0a65 4577 struct net *net = sock_net(skb->sk);
84d2697d 4578 int h, s_h;
434a8a58 4579 int idx = 0, s_idx;
1da177e4
LT		 4580 struct net_device *dev;
4581 struct inet6_dev *idev;
84d2697d 4582 struct hlist_head *head;
1da177e4 4583
84d2697d
ED		 4584 s_h = cb->args[0];
4585 s_idx = cb->args[1];
4586
4587 rcu_read_lock();
4588 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4589 idx = 0;
4590 head = &net->dev_index_head[h];
b67bfe0d 4591 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 4592 if (idx < s_idx)
4593 goto cont;
4594 idev = __in6_dev_get(dev);
4595 if (!idev)
4596 goto cont;
4597 if (inet6_fill_ifinfo(skb, idev,
15e47304 4598 NETLINK_CB(cb->skb).portid,
84d2697d
ED		 4599 cb->nlh->nlmsg_seq,
4600 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4601 goto out;
7562f876 4602cont:
84d2697d
ED		 4603 idx++;
4604 }
1da177e4 4605 }
84d2697d
ED		 4606out:
4607 rcu_read_unlock();
4608 cb->args[1] = idx;
4609 cb->args[0] = h;
1da177e4
LT		 4610
4611 return skb->len;
4612}
4613
4614void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4615{
4616 struct sk_buff *skb;
c346dca1 4617 struct net *net = dev_net(idev->dev);
8d7a76c9 4618 int err = -ENOBUFS;
1ab1457c 4619
339bf98f 4620 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4621 if (skb == NULL)
4622 goto errout;
4623
4624 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4625 if (err < 0) {
4626 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4627 WARN_ON(err == -EMSGSIZE);
4628 kfree_skb(skb);
4629 goto errout;
4630 }
5f75a104 4631 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4632 return;
8d7a76c9
TG		 4633errout:
4634 if (err < 0)
5f75a104 4635 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4636}
4637
339bf98f
TG		 4638static inline size_t inet6_prefix_nlmsg_size(void)
4639{
4640 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4641 + nla_total_size(sizeof(struct in6_addr))
4642 + nla_total_size(sizeof(struct prefix_cacheinfo));
4643}
c5396a31 4644
1da177e4 4645static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4646 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 4647 int event, unsigned int flags)
1da177e4 4648{
6051e2f4
TG		 4649 struct prefixmsg *pmsg;
4650 struct nlmsghdr *nlh;
1da177e4
LT		 4651 struct prefix_cacheinfo ci;
4652
15e47304 4653 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6051e2f4 4654 if (nlh == NULL)
26932566 4655 return -EMSGSIZE;
6051e2f4
TG		 4656
4657 pmsg = nlmsg_data(nlh);
1da177e4 4658 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4659 pmsg->prefix_pad1 = 0;
4660 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4661 pmsg->prefix_ifindex = idev->dev->ifindex;
4662 pmsg->prefix_len = pinfo->prefix_len;
4663 pmsg->prefix_type = pinfo->type;
8a47077a 4664 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4665 pmsg->prefix_flags = 0;
4666 if (pinfo->onlink)
4667 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4668 if (pinfo->autoconf)
4669 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4670
c78679e8
DM		 4671 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4672 goto nla_put_failure;
1da177e4
LT		 4673 ci.preferred_time = ntohl(pinfo->prefered);
4674 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 4675 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4676 goto nla_put_failure;
6051e2f4 4677 return nlmsg_end(skb, nlh);
1da177e4 4678
6051e2f4 4679nla_put_failure:
26932566
PM		 4680 nlmsg_cancel(skb, nlh);
4681 return -EMSGSIZE;
1da177e4
LT		 4682}
4683
1ab1457c 4684static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4685 struct prefix_info *pinfo)
4686{
4687 struct sk_buff *skb;
c346dca1 4688 struct net *net = dev_net(idev->dev);
8c384bfa 4689 int err = -ENOBUFS;
1da177e4 4690
339bf98f 4691 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4692 if (skb == NULL)
4693 goto errout;
4694
4695 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4696 if (err < 0) {
4697 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4698 WARN_ON(err == -EMSGSIZE);
4699 kfree_skb(skb);
4700 goto errout;
4701 }
1ce85fe4
PNA		 4702 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4703 return;
8c384bfa
TG		 4704errout:
4705 if (err < 0)
6fda7350 4706 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4707}
4708
1da177e4
LT		 4709static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4710{
63998ac2
ND		 4711 struct net *net = dev_net(ifp->idev->dev);
4712
c15b1cca
HFS		 4713 if (event)
4714 ASSERT_RTNL();
4715
1da177e4
LT		 4716 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4717
4718 switch (event) {
4719 case RTM_NEWADDR:
95c385b4
NH		 4720 /*
4721 * If the address was optimistic
4722 * we inserted the route at the start of
4723 * our DAD process, so we don't need
4724 * to do it again
4725 */
4726 if (!(ifp->rt->rt6i_node))
4727 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4728 if (ifp->idev->cnf.forwarding)
4729 addrconf_join_anycast(ifp);
7996c799 4730 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 4731 addrconf_prefix_route(&ifp->peer_addr, 128,
4732 ifp->idev->dev, 0, 0);
1da177e4
LT		 4733 break;
4734 case RTM_DELADDR:
4735 if (ifp->idev->cnf.forwarding)
4736 addrconf_leave_anycast(ifp);
4737 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 4738 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79
ND		 4739 struct rt6_info *rt;
4740 struct net_device *dev = ifp->idev->dev;
4741
4742 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4743 dev->ifindex, 1);
4744 if (rt) {
4745 dst_hold(&rt->dst);
4746 if (ip6_del_rt(rt))
4747 dst_free(&rt->dst);
4748 }
4749 }
d8d1f30b 4750 dst_hold(&ifp->rt->dst);
93fa159a 4751
73a8bd74 4752 if (ip6_del_rt(ifp->rt))
d8d1f30b 4753 dst_free(&ifp->rt->dst);
1da177e4
LT		 4754 break;
4755 }
63998ac2 4756 atomic_inc(&net->ipv6.dev_addr_genid);
439677d7 4757 rt_genid_bump_ipv6(net);
1da177e4
LT		 4758}
4759
4760static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4761{
8814c4b5 4762 rcu_read_lock_bh();
1da177e4
LT		 4763 if (likely(ifp->idev->dead == 0))
4764 __ipv6_ifa_notify(event, ifp);
8814c4b5 4765 rcu_read_unlock_bh();
1da177e4
LT		 4766}
4767
4768#ifdef CONFIG_SYSCTL
4769
4770static
fe2c6338 4771int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 4772 void __user *buffer, size_t *lenp, loff_t *ppos)
4773{
4774 int *valp = ctl->data;
4775 int val = *valp;
88af182e 4776 loff_t pos = *ppos;
fe2c6338 4777 struct ctl_table lctl;
1da177e4
LT		 4778 int ret;
4779
013d97e9
FR		 4780 /*
4781 * ctl->data points to idev->cnf.forwarding, we should
4782 * not modify it until we get the rtnl lock.
4783 */
4784 lctl = *ctl;
4785 lctl.data = &val;
4786
4787 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 4788
c8fecf22 4789 if (write)
b325fddb 4790 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4791 if (ret)
4792 *ppos = pos;
1ab1457c 4793 return ret;
1da177e4
LT		 4794}
4795
56d417b1
BH		 4796static void dev_disable_change(struct inet6_dev *idev)
4797{
75538c2b
CW		 4798 struct netdev_notifier_info info;
4799
56d417b1
BH		 4800 if (!idev || !idev->dev)
4801 return;
4802
75538c2b 4803 netdev_notifier_info_init(&info, idev->dev);
56d417b1 4804 if (idev->cnf.disable_ipv6)
75538c2b 4805 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 4806 else
75538c2b 4807 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 4808}
4809
4810static void addrconf_disable_change(struct net *net, __s32 newf)
4811{
4812 struct net_device *dev;
4813 struct inet6_dev *idev;
4814
c6d14c84
ED		 4815 rcu_read_lock();
4816 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4817 idev = __in6_dev_get(dev);
4818 if (idev) {
4819 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4820 idev->cnf.disable_ipv6 = newf;
4821 if (changed)
4822 dev_disable_change(idev);
4823 }
56d417b1 4824 }
c6d14c84 4825 rcu_read_unlock();
56d417b1
BH		 4826}
4827
013d97e9 4828static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 4829{
4830 struct net *net;
013d97e9
FR		 4831 int old;
4832
4833 if (!rtnl_trylock())
4834 return restart_syscall();
56d417b1
BH		 4835
4836 net = (struct net *)table->extra2;
013d97e9
FR		 4837 old = *p;
4838 *p = newf;
56d417b1 4839
013d97e9
FR		 4840 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4841 rtnl_unlock();
56d417b1 4842 return 0;
88af182e 4843 }
56d417b1
BH		 4844
4845 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 4846 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4847 addrconf_disable_change(net, newf);
013d97e9 4848 } else if ((!newf) ^ (!old))
56d417b1
BH		 4849 dev_disable_change((struct inet6_dev *)table->extra1);
4850
4851 rtnl_unlock();
4852 return 0;
4853}
4854
4855static
fe2c6338 4856int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 4857 void __user *buffer, size_t *lenp, loff_t *ppos)
4858{
4859 int *valp = ctl->data;
4860 int val = *valp;
88af182e 4861 loff_t pos = *ppos;
fe2c6338 4862 struct ctl_table lctl;
56d417b1
BH		 4863 int ret;
4864
013d97e9
FR		 4865 /*
4866 * ctl->data points to idev->cnf.disable_ipv6, we should
4867 * not modify it until we get the rtnl lock.
4868 */
4869 lctl = *ctl;
4870 lctl.data = &val;
4871
4872 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 4873
4874 if (write)
4875 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4876 if (ret)
4877 *ppos = pos;
56d417b1
BH		 4878 return ret;
4879}
4880
c92d5491 4881static
4882int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
4883 void __user *buffer, size_t *lenp, loff_t *ppos)
4884{
4885 int *valp = ctl->data;
4886 int ret;
4887 int old, new;
4888
4889 old = *valp;
4890 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4891 new = *valp;
4892
4893 if (write && old != new) {
4894 struct net *net = ctl->extra2;
4895
4896 if (!rtnl_trylock())
4897 return restart_syscall();
4898
4899 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
4900 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4901 NETCONFA_IFINDEX_DEFAULT,
4902 net->ipv6.devconf_dflt);
4903 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
4904 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4905 NETCONFA_IFINDEX_ALL,
4906 net->ipv6.devconf_all);
4907 else {
4908 struct inet6_dev *idev = ctl->extra1;
4909
4910 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4911 idev->dev->ifindex,
4912 &idev->cnf);
4913 }
4914 rtnl_unlock();
4915 }
4916
4917 return ret;
4918}
4919
4920
1da177e4
LT		 4921static struct addrconf_sysctl_table
4922{
4923 struct ctl_table_header *sysctl_header;
fe2c6338 4924 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 4925} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4926 .sysctl_header = NULL,
4927 .addrconf_vars = {
1ab1457c 4928 {
e21e8467
SH		 4929 .procname = "forwarding",
4930 .data = &ipv6_devconf.forwarding,
4931 .maxlen = sizeof(int),
4932 .mode = 0644,
4933 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4934 },
4935 {
e21e8467
SH		 4936 .procname = "hop_limit",
4937 .data = &ipv6_devconf.hop_limit,
4938 .maxlen = sizeof(int),
4939 .mode = 0644,
4940 .proc_handler = proc_dointvec,
1da177e4
LT		 4941 },
4942 {
e21e8467
SH		 4943 .procname = "mtu",
4944 .data = &ipv6_devconf.mtu6,
4945 .maxlen = sizeof(int),
4946 .mode = 0644,
4947 .proc_handler = proc_dointvec,
1da177e4
LT		 4948 },
4949 {
e21e8467
SH		 4950 .procname = "accept_ra",
4951 .data = &ipv6_devconf.accept_ra,
4952 .maxlen = sizeof(int),
4953 .mode = 0644,
4954 .proc_handler = proc_dointvec,
1da177e4
LT		 4955 },
4956 {
e21e8467
SH		 4957 .procname = "accept_redirects",
4958 .data = &ipv6_devconf.accept_redirects,
4959 .maxlen = sizeof(int),
4960 .mode = 0644,
4961 .proc_handler = proc_dointvec,
1da177e4
LT		 4962 },
4963 {
e21e8467
SH		 4964 .procname = "autoconf",
4965 .data = &ipv6_devconf.autoconf,
4966 .maxlen = sizeof(int),
4967 .mode = 0644,
4968 .proc_handler = proc_dointvec,
1da177e4
LT		 4969 },
4970 {
e21e8467
SH		 4971 .procname = "dad_transmits",
4972 .data = &ipv6_devconf.dad_transmits,
4973 .maxlen = sizeof(int),
4974 .mode = 0644,
4975 .proc_handler = proc_dointvec,
1da177e4
LT		 4976 },
4977 {
e21e8467
SH		 4978 .procname = "router_solicitations",
4979 .data = &ipv6_devconf.rtr_solicits,
4980 .maxlen = sizeof(int),
4981 .mode = 0644,
4982 .proc_handler = proc_dointvec,
1da177e4
LT		 4983 },
4984 {
e21e8467
SH		 4985 .procname = "router_solicitation_interval",
4986 .data = &ipv6_devconf.rtr_solicit_interval,
4987 .maxlen = sizeof(int),
4988 .mode = 0644,
4989 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4990 },
4991 {
e21e8467
SH		 4992 .procname = "router_solicitation_delay",
4993 .data = &ipv6_devconf.rtr_solicit_delay,
4994 .maxlen = sizeof(int),
4995 .mode = 0644,
4996 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4997 },
4998 {
e21e8467
SH		 4999 .procname = "force_mld_version",
5000 .data = &ipv6_devconf.force_mld_version,
5001 .maxlen = sizeof(int),
5002 .mode = 0644,
5003 .proc_handler = proc_dointvec,
1da177e4 5004 },
fc4eba58
HFS		 5005 {
5006 .procname = "mldv1_unsolicited_report_interval",
5007 .data =
5008 &ipv6_devconf.mldv1_unsolicited_report_interval,
5009 .maxlen = sizeof(int),
5010 .mode = 0644,
5011 .proc_handler = proc_dointvec_ms_jiffies,
5012 },
5013 {
5014 .procname = "mldv2_unsolicited_report_interval",
5015 .data =
5016 &ipv6_devconf.mldv2_unsolicited_report_interval,
5017 .maxlen = sizeof(int),
5018 .mode = 0644,
5019 .proc_handler = proc_dointvec_ms_jiffies,
5020 },
1da177e4 5021 {
e21e8467
SH		 5022 .procname = "use_tempaddr",
5023 .data = &ipv6_devconf.use_tempaddr,
5024 .maxlen = sizeof(int),
5025 .mode = 0644,
5026 .proc_handler = proc_dointvec,
1da177e4
LT		 5027 },
5028 {
e21e8467
SH		 5029 .procname = "temp_valid_lft",
5030 .data = &ipv6_devconf.temp_valid_lft,
5031 .maxlen = sizeof(int),
5032 .mode = 0644,
5033 .proc_handler = proc_dointvec,
1da177e4
LT		 5034 },
5035 {
e21e8467
SH		 5036 .procname = "temp_prefered_lft",
5037 .data = &ipv6_devconf.temp_prefered_lft,
5038 .maxlen = sizeof(int),
5039 .mode = 0644,
5040 .proc_handler = proc_dointvec,
1da177e4
LT		 5041 },
5042 {
e21e8467
SH		 5043 .procname = "regen_max_retry",
5044 .data = &ipv6_devconf.regen_max_retry,
5045 .maxlen = sizeof(int),
5046 .mode = 0644,
5047 .proc_handler = proc_dointvec,
1da177e4
LT		 5048 },
5049 {
e21e8467
SH		 5050 .procname = "max_desync_factor",
5051 .data = &ipv6_devconf.max_desync_factor,
5052 .maxlen = sizeof(int),
5053 .mode = 0644,
5054 .proc_handler = proc_dointvec,
1da177e4 5055 },
1da177e4 5056 {
e21e8467
SH		 5057 .procname = "max_addresses",
5058 .data = &ipv6_devconf.max_addresses,
5059 .maxlen = sizeof(int),
5060 .mode = 0644,
5061 .proc_handler = proc_dointvec,
1da177e4 5062 },
65f5c7c1 5063 {
e21e8467
SH		 5064 .procname = "accept_ra_defrtr",
5065 .data = &ipv6_devconf.accept_ra_defrtr,
5066 .maxlen = sizeof(int),
5067 .mode = 0644,
5068 .proc_handler = proc_dointvec,
65f5c7c1 5069 },
c4fd30eb 5070 {
e21e8467
SH		 5071 .procname = "accept_ra_pinfo",
5072 .data = &ipv6_devconf.accept_ra_pinfo,
5073 .maxlen = sizeof(int),
5074 .mode = 0644,
5075 .proc_handler = proc_dointvec,
c4fd30eb 5076 },
930d6ff2
YH		 5077#ifdef CONFIG_IPV6_ROUTER_PREF
5078 {
e21e8467
SH		 5079 .procname = "accept_ra_rtr_pref",
5080 .data = &ipv6_devconf.accept_ra_rtr_pref,
5081 .maxlen = sizeof(int),
5082 .mode = 0644,
5083 .proc_handler = proc_dointvec,
930d6ff2 5084 },
52e16356 5085 {
e21e8467
SH		 5086 .procname = "router_probe_interval",
5087 .data = &ipv6_devconf.rtr_probe_interval,
5088 .maxlen = sizeof(int),
5089 .mode = 0644,
5090 .proc_handler = proc_dointvec_jiffies,
52e16356 5091 },
fa03ef38 5092#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 5093 {
e21e8467
SH		 5094 .procname = "accept_ra_rt_info_max_plen",
5095 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5096 .maxlen = sizeof(int),
5097 .mode = 0644,
5098 .proc_handler = proc_dointvec,
09c884d4
YH		 5099 },
5100#endif
930d6ff2 5101#endif
fbea49e1 5102 {
e21e8467
SH		 5103 .procname = "proxy_ndp",
5104 .data = &ipv6_devconf.proxy_ndp,
5105 .maxlen = sizeof(int),
5106 .mode = 0644,
c92d5491 5107 .proc_handler = addrconf_sysctl_proxy_ndp,
fbea49e1 5108 },
0bcbc926 5109 {
e21e8467
SH		 5110 .procname = "accept_source_route",
5111 .data = &ipv6_devconf.accept_source_route,
5112 .maxlen = sizeof(int),
5113 .mode = 0644,
5114 .proc_handler = proc_dointvec,
0bcbc926 5115 },
95c385b4
NH		 5116#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5117 {
e21e8467
SH		 5118 .procname = "optimistic_dad",
5119 .data = &ipv6_devconf.optimistic_dad,
5120 .maxlen = sizeof(int),
5121 .mode = 0644,
5122 .proc_handler = proc_dointvec,
95c385b4
NH		 5123
5124 },
7bc570c8
YH		 5125#endif
5126#ifdef CONFIG_IPV6_MROUTE
5127 {
e21e8467
SH		 5128 .procname = "mc_forwarding",
5129 .data = &ipv6_devconf.mc_forwarding,
5130 .maxlen = sizeof(int),
5131 .mode = 0444,
5132 .proc_handler = proc_dointvec,
7bc570c8 5133 },
95c385b4 5134#endif
778d80be 5135 {
e21e8467
SH		 5136 .procname = "disable_ipv6",
5137 .data = &ipv6_devconf.disable_ipv6,
5138 .maxlen = sizeof(int),
5139 .mode = 0644,
5140 .proc_handler = addrconf_sysctl_disable,
778d80be 5141 },
1b34be74 5142 {
e21e8467
SH		 5143 .procname = "accept_dad",
5144 .data = &ipv6_devconf.accept_dad,
5145 .maxlen = sizeof(int),
5146 .mode = 0644,
5147 .proc_handler = proc_dointvec,
1b34be74 5148 },
f7734fdf 5149 {
f7734fdf
OP		 5150 .procname = "force_tllao",
5151 .data = &ipv6_devconf.force_tllao,
5152 .maxlen = sizeof(int),
5153 .mode = 0644,
5154 .proc_handler = proc_dointvec
5155 },
5cb04436
HFS		 5156 {
5157 .procname = "ndisc_notify",
5158 .data = &ipv6_devconf.ndisc_notify,
5159 .maxlen = sizeof(int),
5160 .mode = 0644,
5161 .proc_handler = proc_dointvec
5162 },
b800c3b9
HFS		 5163 {
5164 .procname = "suppress_frag_ndisc",
5165 .data = &ipv6_devconf.suppress_frag_ndisc,
5166 .maxlen = sizeof(int),
5167 .mode = 0644,
5168 .proc_handler = proc_dointvec
5169 },
1da177e4 5170 {
f8572d8f 5171 /* sentinel */
1da177e4
LT		 5172 }
5173 },
1da177e4
LT		 5174};
5175
bff16c2f 5176static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 5177 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 5178{
5179 int i;
1da177e4 5180 struct addrconf_sysctl_table *t;
6105e293 5181 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 5182
af879cc7 5183 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 5184 if (t == NULL)
f68635e6
PE		 5185 goto out;
5186
bcdd553f 5187 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 5188 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 5189 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 5190 t->addrconf_vars[i].extra2 = net;
1da177e4 5191 }
1da177e4 5192
6105e293 5193 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 5194
6105e293 5195 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
1da177e4 5196 if (t->sysctl_header == NULL)
6105e293 5197 goto free;
f68635e6
PE		 5198
5199 p->sysctl = t;
95897312 5200 return 0;
1da177e4 5201
f68635e6 5202free:
1da177e4 5203 kfree(t);
f68635e6 5204out:
95897312 5205 return -ENOBUFS;
1da177e4
LT		 5206}
5207
408c4768
PE		 5208static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5209{
5210 struct addrconf_sysctl_table *t;
5211
5212 if (p->sysctl == NULL)
5213 return;
5214
5215 t = p->sysctl;
5216 p->sysctl = NULL;
ff538818 5217 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 5218 kfree(t);
5219}
5220
f52295a9
PE		 5221static void addrconf_sysctl_register(struct inet6_dev *idev)
5222{
73af614a 5223 neigh_sysctl_register(idev->dev, idev->nd_parms,
f8572d8f 5224 &ndisc_ifinfo_sysctl_change);
c346dca1 5225 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 5226 idev, &idev->cnf);
f52295a9
PE		 5227}
5228
408c4768 5229static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 5230{
408c4768
PE		 5231 __addrconf_sysctl_unregister(&idev->cnf);
5232 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 5233}
5234
5235
5236#endif
5237
2c8c1e72 5238static int __net_init addrconf_init_net(struct net *net)
e0da5a48 5239{
a79ca223 5240 int err = -ENOMEM;
e0da5a48
PE		 5241 struct ipv6_devconf *all, *dflt;
5242
a79ca223
HZ		 5243 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5244 if (all == NULL)
5245 goto err_alloc_all;
e0da5a48 5246
a79ca223
HZ		 5247 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5248 if (dflt == NULL)
5249 goto err_alloc_dflt;
e0da5a48 5250
a79ca223
HZ		 5251 /* these will be inherited by all namespaces */
5252 dflt->autoconf = ipv6_defaults.autoconf;
5253 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 5254
5255 net->ipv6.devconf_all = all;
5256 net->ipv6.devconf_dflt = dflt;
5257
5258#ifdef CONFIG_SYSCTL
f8572d8f 5259 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 5260 if (err < 0)
5261 goto err_reg_all;
5262
f8572d8f 5263 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 5264 if (err < 0)
5265 goto err_reg_dflt;
5266#endif
5267 return 0;
5268
5269#ifdef CONFIG_SYSCTL
5270err_reg_dflt:
5271 __addrconf_sysctl_unregister(all);
5272err_reg_all:
5273 kfree(dflt);
5274#endif
5275err_alloc_dflt:
5276 kfree(all);
5277err_alloc_all:
5278 return err;
5279}
5280
2c8c1e72 5281static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 5282{
5283#ifdef CONFIG_SYSCTL
5284 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5285 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5286#endif
09ad9bc7 5287 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 5288 kfree(net->ipv6.devconf_dflt);
5289 kfree(net->ipv6.devconf_all);
5290 }
5291}
5292
5293static struct pernet_operations addrconf_ops = {
5294 .init = addrconf_init_net,
5295 .exit = addrconf_exit_net,
5296};
5297
b382b191
TG		 5298static struct rtnl_af_ops inet6_ops = {
5299 .family = AF_INET6,
5300 .fill_link_af = inet6_fill_link_af,
5301 .get_link_af_size = inet6_get_link_af_size,
f53adae4 5302 .set_link_af = inet6_set_link_af,
b382b191
TG		 5303};
5304
1da177e4
LT		 5305/*
5306 * Init / cleanup code
5307 */
5308
5309int __init addrconf_init(void)
5310{
c2e21293 5311 int i, err;
2a8cc6c8 5312
e21e8467
SH		 5313 err = ipv6_addr_label_init();
5314 if (err < 0) {
f3213831
JP		 5315 pr_crit("%s: cannot initialize default policy table: %d\n",
5316 __func__, err);
2cc6d2bf 5317 goto out;
2a8cc6c8 5318 }
1da177e4 5319
2cc6d2bf
NH		 5320 err = register_pernet_subsys(&addrconf_ops);
5321 if (err < 0)
5322 goto out_addrlabel;
e0da5a48 5323
c15b1cca
HFS		 5324 addrconf_wq = create_workqueue("ipv6_addrconf");
5325 if (!addrconf_wq) {
5326 err = -ENOMEM;
5327 goto out_nowq;
5328 }
5329
1da177e4
LT		 5330 /* The addrconf netdev notifier requires that loopback_dev
5331 * has it's ipv6 private information allocated and setup
5332 * before it can bring up and give link-local addresses
5333 * to other devices which are up.
5334 *
5335 * Unfortunately, loopback_dev is not necessarily the first
5336 * entry in the global dev_base list of net devices. In fact,
5337 * it is likely to be the very last entry on that list.
5338 * So this causes the notifier registry below to try and
5339 * give link-local addresses to all devices besides loopback_dev
5340 * first, then loopback_dev, which cases all the non-loopback_dev
5341 * devices to fail to get a link-local address.
5342 *
5343 * So, as a temporary fix, allocate the ipv6 structure for
5344 * loopback_dev first by hand.
5345 * Longer term, all of the dependencies ipv6 has upon the loopback
5346 * device and it being up should be removed.
5347 */
5348 rtnl_lock();
2774c7ab 5349 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 5350 err = -ENOMEM;
5351 rtnl_unlock();
5352 if (err)
e0da5a48 5353 goto errlo;
1da177e4 5354
c2e21293 5355 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5356 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5357
1da177e4
LT		 5358 register_netdevice_notifier(&ipv6_dev_notf);
5359
c15b1cca 5360 addrconf_verify();
c127ea2c 5361
3678a9d8 5362 rtnl_af_register(&inet6_ops);
b382b191 5363
c7ac8679
GR		 5364 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5365 NULL);
c127ea2c
TG		 5366 if (err < 0)
5367 goto errout;
5368
5369 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 5370 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5371 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5372 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5373 inet6_dump_ifaddr, NULL);
5374 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5375 inet6_dump_ifmcaddr, NULL);
5376 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5377 inet6_dump_ifacaddr, NULL);
76f8f6cb 5378 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 5379 inet6_netconf_dump_devconf, NULL);
c127ea2c 5380
2a8cc6c8
YH		 5381 ipv6_addr_label_rtnl_register();
5382
1da177e4 5383 return 0;
c127ea2c 5384errout:
b382b191 5385 rtnl_af_unregister(&inet6_ops);
c127ea2c 5386 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5387errlo:
c15b1cca
HFS		 5388 destroy_workqueue(addrconf_wq);
5389out_nowq:
e0da5a48 5390 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 5391out_addrlabel:
5392 ipv6_addr_label_cleanup();
5393out:
c127ea2c 5394 return err;
1da177e4
LT		 5395}
5396
09f7709f 5397void addrconf_cleanup(void)
1da177e4 5398{
176c39af 5399 struct net_device *dev;
1da177e4
LT		 5400 int i;
5401
5402 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5403 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 5404 ipv6_addr_label_cleanup();
1da177e4
LT		 5405
5406 rtnl_lock();
5407
b382b191
TG		 5408 __rtnl_af_unregister(&inet6_ops);
5409
176c39af
DL		 5410 /* clean dev list */
5411 for_each_netdev(&init_net, dev) {
5412 if (__in6_dev_get(dev) == NULL)
5413 continue;
5414 addrconf_ifdown(dev, 1);
5415 }
5416 addrconf_ifdown(init_net.loopback_dev, 2);
5417
1da177e4
LT		 5418 /*
5419 * Check hash table.
5420 */
5c578aed 5421 spin_lock_bh(&addrconf_hash_lock);
c2e21293 5422 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5423 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 5424 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 5425 cancel_delayed_work(&addr_chk_work);
1da177e4 5426 rtnl_unlock();
c15b1cca
HFS		 5427
5428 destroy_workqueue(addrconf_wq);
1da177e4 5429}
Linux kernel - Deliverables
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