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ipv4: fail early when creating netdev named all or default
[mirror_ubuntu-jammy-kernel.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
1da177e4
LT		 46#include <linux/socket.h>
47#include <linux/sockios.h>
1da177e4
LT		 48#include <linux/net.h>
49#include <linux/in6.h>
50#include <linux/netdevice.h>
1823730f 51#include <linux/if_addr.h>
1da177e4
LT		 52#include <linux/if_arp.h>
53#include <linux/if_arcnet.h>
54#include <linux/if_infiniband.h>
55#include <linux/route.h>
56#include <linux/inetdevice.h>
57#include <linux/init.h>
5a0e3ad6 58#include <linux/slab.h>
1da177e4
LT		 59#ifdef CONFIG_SYSCTL
60#include <linux/sysctl.h>
61#endif
4fc268d2 62#include <linux/capability.h>
1da177e4
LT		 63#include <linux/delay.h>
64#include <linux/notifier.h>
543537bd 65#include <linux/string.h>
ddbe5032 66#include <linux/hash.h>
1da177e4 67
457c4cbc 68#include <net/net_namespace.h>
1da177e4
LT		 69#include <net/sock.h>
70#include <net/snmp.h>
71
06a4c1c5 72#include <net/af_ieee802154.h>
cb6bf355 73#include <net/firewire.h>
1da177e4
LT		 74#include <net/ipv6.h>
75#include <net/protocol.h>
76#include <net/ndisc.h>
77#include <net/ip6_route.h>
78#include <net/addrconf.h>
79#include <net/tcp.h>
80#include <net/ip.h>
5d620266 81#include <net/netlink.h>
f24e3d65 82#include <net/pkt_sched.h>
1da177e4
LT		 83#include <linux/if_tunnel.h>
84#include <linux/rtnetlink.h>
f3a1bfb1 85#include <linux/netconf.h>
1da177e4 86#include <linux/random.h>
e21e8467 87#include <linux/uaccess.h>
7f7d9a6b 88#include <asm/unaligned.h>
1da177e4
LT		 89
90#include <linux/proc_fs.h>
91#include <linux/seq_file.h>
bc3b2d7f 92#include <linux/export.h>
1da177e4
LT		 93
94/* Set to 3 to get tracing... */
95#define ACONF_DEBUG 2
96
97#if ACONF_DEBUG >= 3
ba3542e1 98#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
1da177e4 99#else
ba3542e1 100#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
1da177e4
LT		 101#endif
102
103#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e
TG		 104
105static inline u32 cstamp_delta(unsigned long cstamp)
106{
107 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
108}
1da177e4
LT		 109
110#ifdef CONFIG_SYSCTL
f52295a9 111static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 112static void addrconf_sysctl_unregister(struct inet6_dev *idev);
113#else
114static inline void addrconf_sysctl_register(struct inet6_dev *idev)
115{
116}
117
118static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
119{
120}
1da177e4
LT		 121#endif
122
eb7e0575
SD		 123static void __ipv6_regen_rndid(struct inet6_dev *idev);
124static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 125static void ipv6_regen_rndid(unsigned long data);
1da177e4 126
1b34be74 127static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 128static int ipv6_count_addresses(struct inet6_dev *idev);
129
130/*
131 * Configured unicast address hash table
132 */
c2e21293 133static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 134static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 135
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,
d9333196 189 .accept_ra_from_local = 0,
c4fd30eb 190 .accept_ra_pinfo = 1,
930d6ff2
YH		 191#ifdef CONFIG_IPV6_ROUTER_PREF
192 .accept_ra_rtr_pref = 1,
52e16356 193 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 194#ifdef CONFIG_IPV6_ROUTE_INFO
195 .accept_ra_rt_info_max_plen = 0,
196#endif
930d6ff2 197#endif
fbea49e1 198 .proxy_ndp = 0,
0bcbc926 199 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 200 .disable_ipv6 = 0,
1b34be74 201 .accept_dad = 1,
b800c3b9 202 .suppress_frag_ndisc = 1,
1da177e4
LT		 203};
204
ab32ea5d 205static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 206 .forwarding = 0,
207 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
208 .mtu6 = IPV6_MIN_MTU,
209 .accept_ra = 1,
210 .accept_redirects = 1,
211 .autoconf = 1,
fc4eba58
HFS		 212 .force_mld_version = 0,
213 .mldv1_unsolicited_report_interval = 10 * HZ,
214 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 215 .dad_transmits = 1,
216 .rtr_solicits = MAX_RTR_SOLICITATIONS,
217 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
218 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 219 .use_tempaddr = 0,
220 .temp_valid_lft = TEMP_VALID_LIFETIME,
221 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
222 .regen_max_retry = REGEN_MAX_RETRY,
223 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 224 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 225 .accept_ra_defrtr = 1,
d9333196 226 .accept_ra_from_local = 0,
c4fd30eb 227 .accept_ra_pinfo = 1,
930d6ff2
YH		 228#ifdef CONFIG_IPV6_ROUTER_PREF
229 .accept_ra_rtr_pref = 1,
52e16356 230 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 231#ifdef CONFIG_IPV6_ROUTE_INFO
232 .accept_ra_rt_info_max_plen = 0,
233#endif
930d6ff2 234#endif
fbea49e1 235 .proxy_ndp = 0,
0bcbc926 236 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 237 .disable_ipv6 = 0,
1b34be74 238 .accept_dad = 1,
b800c3b9 239 .suppress_frag_ndisc = 1,
1da177e4
LT		 240};
241
f24e3d65 242/* Check if a valid qdisc is available */
05297949 243static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 244{
05297949 245 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 246}
247
b7b1bfce 248static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 249{
b7b1bfce
HFS		 250 if (del_timer(&idev->rs_timer))
251 __in6_dev_put(idev);
252}
253
c15b1cca 254static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 255{
c15b1cca 256 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 257 __in6_ifa_put(ifp);
258}
259
b7b1bfce
HFS		 260static void addrconf_mod_rs_timer(struct inet6_dev *idev,
261 unsigned long when)
262{
263 if (!timer_pending(&idev->rs_timer))
264 in6_dev_hold(idev);
265 mod_timer(&idev->rs_timer, jiffies + when);
266}
1da177e4 267
c15b1cca
HFS		 268static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
269 unsigned long delay)
1da177e4 270{
c15b1cca 271 if (!delayed_work_pending(&ifp->dad_work))
1da177e4 272 in6_ifa_hold(ifp);
c15b1cca 273 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
1da177e4
LT		 274}
275
7f7d9a6b
HX		 276static int snmp6_alloc_dev(struct inet6_dev *idev)
277{
827da44c
JS		 278 int i;
279
698365fa
WC		 280 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
281 if (!idev->stats.ipv6)
7f7d9a6b 282 goto err_ip;
827da44c
JS		 283
284 for_each_possible_cpu(i) {
285 struct ipstats_mib *addrconf_stats;
698365fa 286 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 287 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 288 }
289
290
be281e55
ED		 291 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
292 GFP_KERNEL);
293 if (!idev->stats.icmpv6dev)
7f7d9a6b 294 goto err_icmp;
be281e55
ED		 295 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
296 GFP_KERNEL);
297 if (!idev->stats.icmpv6msgdev)
14878f75 298 goto err_icmpmsg;
7f7d9a6b
HX		 299
300 return 0;
301
14878f75 302err_icmpmsg:
be281e55 303 kfree(idev->stats.icmpv6dev);
7f7d9a6b 304err_icmp:
698365fa 305 free_percpu(idev->stats.ipv6);
7f7d9a6b 306err_ip:
aaf70ec7 307 return -ENOMEM;
7f7d9a6b
HX		 308}
309
8e5e8f30 310static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 311{
312 struct inet6_dev *ndev;
313
314 ASSERT_RTNL();
315
316 if (dev->mtu < IPV6_MIN_MTU)
317 return NULL;
318
1ab1457c 319 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 320
1ab1457c
YH		 321 if (ndev == NULL)
322 return NULL;
322f74a4
IO		 323
324 rwlock_init(&ndev->lock);
325 ndev->dev = dev;
502a2ffd 326 INIT_LIST_HEAD(&ndev->addr_list);
b7b1bfce
HFS		 327 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
328 (unsigned long)ndev);
c346dca1 329 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 330 ndev->cnf.mtu6 = dev->mtu;
331 ndev->cnf.sysctl = NULL;
332 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
333 if (ndev->nd_parms == NULL) {
334 kfree(ndev);
335 return NULL;
336 }
0187bdfb
BH		 337 if (ndev->cnf.forwarding)
338 dev_disable_lro(dev);
322f74a4
IO		 339 /* We refer to the device */
340 dev_hold(dev);
1da177e4 341
322f74a4 342 if (snmp6_alloc_dev(ndev) < 0) {
ba3542e1 343 ADBG(KERN_WARNING
f3213831 344 "%s: cannot allocate memory for statistics; dev=%s.\n",
ba3542e1 345 __func__, dev->name);
322f74a4 346 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 347 dev_put(dev);
348 kfree(ndev);
322f74a4
IO		 349 return NULL;
350 }
1da177e4 351
322f74a4 352 if (snmp6_register_dev(ndev) < 0) {
ba3542e1 353 ADBG(KERN_WARNING
f3213831 354 "%s: cannot create /proc/net/dev_snmp6/%s\n",
ba3542e1 355 __func__, dev->name);
322f74a4
IO		 356 neigh_parms_release(&nd_tbl, ndev->nd_parms);
357 ndev->dead = 1;
358 in6_dev_finish_destroy(ndev);
359 return NULL;
360 }
361
362 /* One reference from device. We must do this before
363 * we invoke __ipv6_regen_rndid().
364 */
365 in6_dev_hold(ndev);
1da177e4 366
1b34be74
YH		 367 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
368 ndev->cnf.accept_dad = -1;
369
07a93626 370#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 371 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 372 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 373 ndev->cnf.rtr_solicits = 0;
374 }
375#endif
376
372e6c8f 377 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 378 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 379 if ((dev->flags&IFF_LOOPBACK) ||
380 dev->type == ARPHRD_TUNNEL ||
9625ed72 381 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 382 dev->type == ARPHRD_SIT ||
0be669bb 383 dev->type == ARPHRD_NONE) {
322f74a4
IO		 384 ndev->cnf.use_tempaddr = -1;
385 } else {
386 in6_dev_hold(ndev);
387 ipv6_regen_rndid((unsigned long) ndev);
388 }
5d9efa7e 389
914faa14 390 ndev->token = in6addr_any;
1da177e4 391
f24e3d65 392 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 393 ndev->if_flags |= IF_READY;
394
322f74a4
IO		 395 ipv6_mc_init_dev(ndev);
396 ndev->tstamp = jiffies;
f52295a9 397 addrconf_sysctl_register(ndev);
30c4cf57 398 /* protected by rtnl_lock */
cf778b00 399 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 400
2c5e8933
HFS		 401 /* Join interface-local all-node multicast group */
402 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
403
d88ae4cc 404 /* Join all-node multicast group */
f3ee4010 405 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 406
d6ddef9e 407 /* Join all-router multicast group if forwarding is set */
8b2aaede 408 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 409 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
410
1da177e4
LT		 411 return ndev;
412}
413
8e5e8f30 414static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 415{
416 struct inet6_dev *idev;
417
418 ASSERT_RTNL();
419
e21e8467
SH		 420 idev = __in6_dev_get(dev);
421 if (!idev) {
422 idev = ipv6_add_dev(dev);
423 if (!idev)
1da177e4
LT		 424 return NULL;
425 }
c5e33bdd 426
1da177e4
LT		 427 if (dev->flags&IFF_UP)
428 ipv6_mc_up(idev);
429 return idev;
430}
431
f3a1bfb1
ND		 432static int inet6_netconf_msgsize_devconf(int type)
433{
434 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
435 + nla_total_size(4); /* NETCONFA_IFINDEX */
436
76f8f6cb
ND		 437 /* type -1 is used for ALL */
438 if (type == -1 || type == NETCONFA_FORWARDING)
f3a1bfb1 439 size += nla_total_size(4);
b1afce95 440#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 441 if (type == -1 || type == NETCONFA_MC_FORWARDING)
442 size += nla_total_size(4);
b1afce95 443#endif
c92d5491 444 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
445 size += nla_total_size(4);
f3a1bfb1
ND		 446
447 return size;
448}
449
450static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
451 struct ipv6_devconf *devconf, u32 portid,
452 u32 seq, int event, unsigned int flags,
453 int type)
454{
455 struct nlmsghdr *nlh;
456 struct netconfmsg *ncm;
457
458 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
459 flags);
460 if (nlh == NULL)
461 return -EMSGSIZE;
462
463 ncm = nlmsg_data(nlh);
464 ncm->ncm_family = AF_INET6;
465
466 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
467 goto nla_put_failure;
468
76f8f6cb
ND		 469 /* type -1 is used for ALL */
470 if ((type == -1 || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 471 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
472 goto nla_put_failure;
b1afce95 473#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 474 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
475 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
476 devconf->mc_forwarding) < 0)
477 goto nla_put_failure;
b1afce95 478#endif
c92d5491 479 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
480 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
481 goto nla_put_failure;
482
f3a1bfb1
ND		 483 return nlmsg_end(skb, nlh);
484
485nla_put_failure:
486 nlmsg_cancel(skb, nlh);
487 return -EMSGSIZE;
488}
489
d67b8c61
ND		 490void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
491 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 492{
493 struct sk_buff *skb;
494 int err = -ENOBUFS;
495
496 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
497 if (skb == NULL)
498 goto errout;
499
500 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
501 RTM_NEWNETCONF, 0, type);
502 if (err < 0) {
503 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
504 WARN_ON(err == -EMSGSIZE);
505 kfree_skb(skb);
506 goto errout;
507 }
508 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
509 return;
510errout:
bd779028 511 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 512}
513
76f8f6cb
ND		 514static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
515 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
516 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 517 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
76f8f6cb
ND		 518};
519
520static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 521 struct nlmsghdr *nlh)
76f8f6cb
ND		 522{
523 struct net *net = sock_net(in_skb->sk);
524 struct nlattr *tb[NETCONFA_MAX+1];
525 struct netconfmsg *ncm;
526 struct sk_buff *skb;
527 struct ipv6_devconf *devconf;
528 struct inet6_dev *in6_dev;
529 struct net_device *dev;
530 int ifindex;
531 int err;
532
533 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
534 devconf_ipv6_policy);
535 if (err < 0)
536 goto errout;
537
538 err = EINVAL;
539 if (!tb[NETCONFA_IFINDEX])
540 goto errout;
541
542 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
543 switch (ifindex) {
544 case NETCONFA_IFINDEX_ALL:
545 devconf = net->ipv6.devconf_all;
546 break;
547 case NETCONFA_IFINDEX_DEFAULT:
548 devconf = net->ipv6.devconf_dflt;
549 break;
550 default:
551 dev = __dev_get_by_index(net, ifindex);
552 if (dev == NULL)
553 goto errout;
554 in6_dev = __in6_dev_get(dev);
555 if (in6_dev == NULL)
556 goto errout;
557 devconf = &in6_dev->cnf;
558 break;
559 }
560
561 err = -ENOBUFS;
562 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
563 if (skb == NULL)
564 goto errout;
565
566 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
567 NETLINK_CB(in_skb).portid,
568 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
569 -1);
570 if (err < 0) {
571 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
572 WARN_ON(err == -EMSGSIZE);
573 kfree_skb(skb);
574 goto errout;
575 }
576 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
577errout:
578 return err;
579}
580
7a674200
ND		 581static int inet6_netconf_dump_devconf(struct sk_buff *skb,
582 struct netlink_callback *cb)
583{
584 struct net *net = sock_net(skb->sk);
585 int h, s_h;
586 int idx, s_idx;
587 struct net_device *dev;
588 struct inet6_dev *idev;
589 struct hlist_head *head;
590
591 s_h = cb->args[0];
592 s_idx = idx = cb->args[1];
593
594 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
595 idx = 0;
596 head = &net->dev_index_head[h];
597 rcu_read_lock();
63998ac2
ND		 598 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
599 net->dev_base_seq;
7a674200
ND		 600 hlist_for_each_entry_rcu(dev, head, index_hlist) {
601 if (idx < s_idx)
602 goto cont;
603 idev = __in6_dev_get(dev);
604 if (!idev)
605 goto cont;
606
607 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
608 &idev->cnf,
609 NETLINK_CB(cb->skb).portid,
610 cb->nlh->nlmsg_seq,
611 RTM_NEWNETCONF,
612 NLM_F_MULTI,
613 -1) <= 0) {
614 rcu_read_unlock();
615 goto done;
616 }
63998ac2 617 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 618cont:
619 idx++;
620 }
621 rcu_read_unlock();
622 }
623 if (h == NETDEV_HASHENTRIES) {
624 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
625 net->ipv6.devconf_all,
626 NETLINK_CB(cb->skb).portid,
627 cb->nlh->nlmsg_seq,
628 RTM_NEWNETCONF, NLM_F_MULTI,
629 -1) <= 0)
630 goto done;
631 else
632 h++;
633 }
634 if (h == NETDEV_HASHENTRIES + 1) {
635 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
636 net->ipv6.devconf_dflt,
637 NETLINK_CB(cb->skb).portid,
638 cb->nlh->nlmsg_seq,
639 RTM_NEWNETCONF, NLM_F_MULTI,
640 -1) <= 0)
641 goto done;
642 else
643 h++;
644 }
645done:
646 cb->args[0] = h;
647 cb->args[1] = idx;
648
649 return skb->len;
650}
651
1da177e4
LT		 652#ifdef CONFIG_SYSCTL
653static void dev_forward_change(struct inet6_dev *idev)
654{
655 struct net_device *dev;
656 struct inet6_ifaddr *ifa;
1da177e4
LT		 657
658 if (!idev)
659 return;
660 dev = idev->dev;
0187bdfb
BH		 661 if (idev->cnf.forwarding)
662 dev_disable_lro(dev);
1a940835 663 if (dev->flags & IFF_MULTICAST) {
2c5e8933 664 if (idev->cnf.forwarding) {
f3ee4010 665 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 666 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
667 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
668 } else {
f3ee4010 669 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 670 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
671 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
672 }
1da177e4 673 }
502a2ffd 674
675 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 676 if (ifa->flags&IFA_F_TENTATIVE)
677 continue;
1da177e4
LT		 678 if (idev->cnf.forwarding)
679 addrconf_join_anycast(ifa);
680 else
681 addrconf_leave_anycast(ifa);
682 }
f3a1bfb1
ND		 683 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
684 dev->ifindex, &idev->cnf);
1da177e4
LT		 685}
686
687
e186932b 688static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 689{
690 struct net_device *dev;
691 struct inet6_dev *idev;
692
4acd4945 693 for_each_netdev(net, dev) {
1da177e4
LT		 694 idev = __in6_dev_get(dev);
695 if (idev) {
e186932b
PE		 696 int changed = (!idev->cnf.forwarding) ^ (!newf);
697 idev->cnf.forwarding = newf;
1da177e4
LT		 698 if (changed)
699 dev_forward_change(idev);
700 }
1da177e4 701 }
1da177e4 702}
c8fecf22 703
013d97e9 704static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 705{
bff16c2f 706 struct net *net;
013d97e9
FR		 707 int old;
708
709 if (!rtnl_trylock())
710 return restart_syscall();
bff16c2f
PE		 711
712 net = (struct net *)table->extra2;
013d97e9
FR		 713 old = *p;
714 *p = newf;
b325fddb 715
013d97e9 716 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 717 if ((!newf) ^ (!old))
718 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
719 NETCONFA_IFINDEX_DEFAULT,
720 net->ipv6.devconf_dflt);
013d97e9
FR		 721 rtnl_unlock();
722 return 0;
88af182e 723 }
c8fecf22 724
e186932b 725 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 726 net->ipv6.devconf_dflt->forwarding = newf;
727 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 728 if ((!newf) ^ (!old))
729 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
730 NETCONFA_IFINDEX_ALL,
731 net->ipv6.devconf_all);
013d97e9 732 } else if ((!newf) ^ (!old))
c8fecf22 733 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 734 rtnl_unlock();
c8fecf22 735
013d97e9 736 if (newf)
7b4da532 737 rt6_purge_dflt_routers(net);
b325fddb 738 return 1;
c8fecf22 739}
1da177e4
LT		 740#endif
741
5c578aed 742/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 743void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
744{
c2e21293 745 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 746
1da177e4 747#ifdef NET_REFCNT_DEBUG
91df42be 748 pr_debug("%s\n", __func__);
1da177e4
LT		 749#endif
750
751 in6_dev_put(ifp->idev);
752
c15b1cca
HFS		 753 if (cancel_delayed_work(&ifp->dad_work))
754 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
755 ifp);
1da177e4 756
e9d3e084 757 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 758 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 759 return;
760 }
94e187c0 761 ip6_rt_put(ifp->rt);
1da177e4 762
e5785985 763 kfree_rcu(ifp, rcu);
1da177e4
LT		 764}
765
e55ffac6
BH		 766static void
767ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
768{
502a2ffd 769 struct list_head *p;
8a6ce0c0 770 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 771
772 /*
773 * Each device address list is sorted in order of scope -
774 * global before linklocal.
775 */
502a2ffd 776 list_for_each(p, &idev->addr_list) {
777 struct inet6_ifaddr *ifa
778 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 779 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 780 break;
781 }
782
b54c9b98 783 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 784}
785
ddbe5032 786static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 787{
ddbe5032 788 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 789}
790
1da177e4
LT		 791/* On success it returns ifp with increased reference count */
792
793static struct inet6_ifaddr *
3f8f5298
JP		 794ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
795 const struct in6_addr *peer_addr, int pfxlen,
8a226b2c 796 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
1da177e4
LT		 797{
798 struct inet6_ifaddr *ifa = NULL;
799 struct rt6_info *rt;
3a88a81d 800 unsigned int hash;
1da177e4 801 int err = 0;
d68b8270
YH		 802 int addr_type = ipv6_addr_type(addr);
803
804 if (addr_type == IPV6_ADDR_ANY ||
805 addr_type & IPV6_ADDR_MULTICAST ||
806 (!(idev->dev->flags & IFF_LOOPBACK) &&
807 addr_type & IPV6_ADDR_LOOPBACK))
808 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 809
8814c4b5 810 rcu_read_lock_bh();
1da177e4
LT		 811 if (idev->dead) {
812 err = -ENODEV; /*XXX*/
813 goto out2;
814 }
815
56d417b1 816 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 817 err = -EACCES;
818 goto out2;
819 }
820
5c578aed 821 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 822
823 /* Ignore adding duplicate addresses on an interface */
c346dca1 824 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ba3542e1 825 ADBG("ipv6_add_addr: already assigned\n");
1da177e4
LT		 826 err = -EEXIST;
827 goto out;
828 }
829
322f74a4 830 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 831
832 if (ifa == NULL) {
ba3542e1 833 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 834 err = -ENOBUFS;
835 goto out;
836 }
837
8f031519 838 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 839 if (IS_ERR(rt)) {
840 err = PTR_ERR(rt);
841 goto out;
842 }
843
bba24896
JP		 844 neigh_parms_data_state_setall(idev->nd_parms);
845
4e3fd7a0 846 ifa->addr = *addr;
3f8f5298
JP		 847 if (peer_addr)
848 ifa->peer_addr = *peer_addr;
1da177e4
LT		 849
850 spin_lock_init(&ifa->lock);
e9d3e084 851 spin_lock_init(&ifa->state_lock);
c15b1cca 852 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 853 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 854 ifa->scope = scope;
855 ifa->prefix_len = pfxlen;
856 ifa->flags = flags | IFA_F_TENTATIVE;
8a226b2c
JB		 857 ifa->valid_lft = valid_lft;
858 ifa->prefered_lft = prefered_lft;
1da177e4 859 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 860 ifa->tokenized = false;
1da177e4 861
57f5f544
KF		 862 ifa->rt = rt;
863
1da177e4
LT		 864 ifa->idev = idev;
865 in6_dev_hold(idev);
866 /* For caller */
867 in6_ifa_hold(ifa);
868
869 /* Add to big hash table */
ddbe5032 870 hash = inet6_addr_hash(addr);
1da177e4 871
5c578aed 872 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 873 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 874
875 write_lock(&idev->lock);
876 /* Add to inet6_dev unicast addr list. */
e55ffac6 877 ipv6_link_dev_addr(idev, ifa);
1da177e4 878
1da177e4 879 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 880 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 881 in6_ifa_hold(ifa);
882 }
1da177e4 883
1da177e4
LT		 884 in6_ifa_hold(ifa);
885 write_unlock(&idev->lock);
886out2:
8814c4b5 887 rcu_read_unlock_bh();
1da177e4 888
fd92833a 889 if (likely(err == 0))
f88c91dd 890 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 891 else {
892 kfree(ifa);
893 ifa = ERR_PTR(err);
894 }
895
896 return ifa;
897out:
5c578aed 898 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 899 goto out2;
900}
901
5b84efec
TH		 902enum cleanup_prefix_rt_t {
903 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
904 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
905 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
906};
907
908/*
909 * Check, whether the prefix for ifp would still need a prefix route
910 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
911 * constants.
912 *
913 * 1) we don't purge prefix if address was not permanent.
914 * prefix is managed by its own lifetime.
915 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
916 * 3) if there are no addresses, delete prefix.
917 * 4) if there are still other permanent address(es),
918 * corresponding prefix is still permanent.
919 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
920 * don't purge the prefix, assume user space is managing it.
921 * 6) otherwise, update prefix lifetime to the
922 * longest valid lifetime among the corresponding
923 * addresses on the device.
924 * Note: subsequent RA will update lifetime.
925 **/
926static enum cleanup_prefix_rt_t
927check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
928{
929 struct inet6_ifaddr *ifa;
930 struct inet6_dev *idev = ifp->idev;
931 unsigned long lifetime;
932 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
933
934 *expires = jiffies;
935
936 list_for_each_entry(ifa, &idev->addr_list, if_list) {
937 if (ifa == ifp)
938 continue;
939 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
940 ifp->prefix_len))
941 continue;
942 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
943 return CLEANUP_PREFIX_RT_NOP;
944
945 action = CLEANUP_PREFIX_RT_EXPIRE;
946
947 spin_lock(&ifa->lock);
948
949 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
950 /*
951 * Note: Because this address is
952 * not permanent, lifetime <
953 * LONG_MAX / HZ here.
954 */
955 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
956 *expires = ifa->tstamp + lifetime * HZ;
957 spin_unlock(&ifa->lock);
958 }
959
960 return action;
961}
962
963static void
964cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
965{
966 struct rt6_info *rt;
967
968 rt = addrconf_get_prefix_route(&ifp->addr,
969 ifp->prefix_len,
970 ifp->idev->dev,
971 0, RTF_GATEWAY | RTF_DEFAULT);
972 if (rt) {
973 if (del_rt)
974 ip6_del_rt(rt);
975 else {
976 if (!(rt->rt6i_flags & RTF_EXPIRES))
977 rt6_set_expires(rt, expires);
978 ip6_rt_put(rt);
979 }
980 }
981}
982
983
1da177e4
LT		 984/* This function wants to get referenced ifp and releases it before return */
985
986static void ipv6_del_addr(struct inet6_ifaddr *ifp)
987{
4c5ff6a6 988 int state;
5b84efec
TH		 989 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
990 unsigned long expires;
1da177e4 991
c15b1cca
HFS		 992 ASSERT_RTNL();
993
4c5ff6a6
HX		 994 spin_lock_bh(&ifp->state_lock);
995 state = ifp->state;
e9d3e084 996 ifp->state = INET6_IFADDR_STATE_DEAD;
4c5ff6a6
HX		 997 spin_unlock_bh(&ifp->state_lock);
998
999 if (state == INET6_IFADDR_STATE_DEAD)
1000 goto out;
1da177e4 1001
5c578aed 1002 spin_lock_bh(&addrconf_hash_lock);
1003 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1004 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1005
5b84efec 1006 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1007
1da177e4 1008 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1009 list_del(&ifp->tmp_list);
1010 if (ifp->ifpub) {
1011 in6_ifa_put(ifp->ifpub);
1012 ifp->ifpub = NULL;
1da177e4 1013 }
372e6c8f 1014 __in6_ifa_put(ifp);
1da177e4 1015 }
1da177e4 1016
5b84efec
TH		 1017 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1018 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1019
5b84efec
TH		 1020 list_del_init(&ifp->if_list);
1021 __in6_ifa_put(ifp);
1022
1023 write_unlock_bh(&ifp->idev->lock);
1da177e4 1024
c15b1cca 1025 addrconf_del_dad_work(ifp);
b2238566 1026
1da177e4
LT		 1027 ipv6_ifa_notify(RTM_DELADDR, ifp);
1028
f88c91dd 1029 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1030
5b84efec
TH		 1031 if (action != CLEANUP_PREFIX_RT_NOP) {
1032 cleanup_prefix_route(ifp, expires,
1033 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1034 }
1035
c3968a85
DW		 1036 /* clean up prefsrc entries */
1037 rt6_remove_prefsrc(ifp);
4c5ff6a6 1038out:
1da177e4
LT		 1039 in6_ifa_put(ifp);
1040}
1041
1da177e4
LT		 1042static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1043{
1044 struct inet6_dev *idev = ifp->idev;
1045 struct in6_addr addr, *tmpaddr;
76f793e3 1046 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1047 unsigned long regen_advance;
1da177e4
LT		 1048 int tmp_plen;
1049 int ret = 0;
95c385b4 1050 u32 addr_flags;
76f793e3 1051 unsigned long now = jiffies;
1da177e4 1052
53bd6749 1053 write_lock_bh(&idev->lock);
1da177e4
LT		 1054 if (ift) {
1055 spin_lock_bh(&ift->lock);
1056 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1057 spin_unlock_bh(&ift->lock);
1058 tmpaddr = &addr;
1059 } else {
1060 tmpaddr = NULL;
1061 }
1062retry:
1063 in6_dev_hold(idev);
1064 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1065 write_unlock_bh(&idev->lock);
f3213831 1066 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1067 in6_dev_put(idev);
1068 ret = -1;
1069 goto out;
1070 }
1071 spin_lock_bh(&ifp->lock);
1072 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1073 idev->cnf.use_tempaddr = -1; /*XXX*/
1074 spin_unlock_bh(&ifp->lock);
53bd6749 1075 write_unlock_bh(&idev->lock);
f3213831
JP		 1076 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1077 __func__);
1da177e4
LT		 1078 in6_dev_put(idev);
1079 ret = -1;
1080 goto out;
1081 }
1082 in6_ifa_hold(ifp);
1083 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 1084 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1085 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1086 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 1087 tmp_valid_lft = min_t(__u32,
1088 ifp->valid_lft,
7a876b0e 1089 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 1090 tmp_prefered_lft = min_t(__u32,
1091 ifp->prefered_lft,
7a876b0e 1092 idev->cnf.temp_prefered_lft + age -
784e2710 1093 idev->cnf.max_desync_factor);
1da177e4 1094 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1095 tmp_tstamp = ifp->tstamp;
1096 spin_unlock_bh(&ifp->lock);
1097
eac55bf9 1098 regen_advance = idev->cnf.regen_max_retry *
7eaa48a4 1099 idev->cnf.dad_transmits *
1f9248e5 1100 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
53bd6749 1101 write_unlock_bh(&idev->lock);
95c385b4 1102
eac55bf9
BB		 1103 /* A temporary address is created only if this calculated Preferred
1104 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1105 * an implementation must not create a temporary address with a zero
1106 * Preferred Lifetime.
ecab6701
HK		 1107 * Use age calculation as in addrconf_verify to avoid unnecessary
1108 * temporary addresses being generated.
eac55bf9 1109 */
ecab6701
HK		 1110 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1111 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1112 in6_ifa_put(ifp);
1113 in6_dev_put(idev);
1114 ret = -1;
1115 goto out;
1116 }
1117
95c385b4
NH		 1118 addr_flags = IFA_F_TEMPORARY;
1119 /* set in addrconf_prefix_rcv() */
1120 if (ifp->flags & IFA_F_OPTIMISTIC)
1121 addr_flags |= IFA_F_OPTIMISTIC;
1122
4b08a8f1
HFS		 1123 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1124 ipv6_addr_scope(&addr), addr_flags,
1125 tmp_valid_lft, tmp_prefered_lft);
1126 if (IS_ERR(ift)) {
1da177e4
LT		 1127 in6_ifa_put(ifp);
1128 in6_dev_put(idev);
f3213831 1129 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1130 tmpaddr = &addr;
53bd6749 1131 write_lock_bh(&idev->lock);
1da177e4
LT		 1132 goto retry;
1133 }
1134
1135 spin_lock_bh(&ift->lock);
1136 ift->ifpub = ifp;
76f793e3 1137 ift->cstamp = now;
1da177e4
LT		 1138 ift->tstamp = tmp_tstamp;
1139 spin_unlock_bh(&ift->lock);
1140
cf22f9a2 1141 addrconf_dad_start(ift);
1da177e4
LT		 1142 in6_ifa_put(ift);
1143 in6_dev_put(idev);
1144out:
1145 return ret;
1146}
1da177e4
LT		 1147
1148/*
072047e4 1149 * Choose an appropriate source address (RFC3484)
1da177e4 1150 */
a9b05723
YH		 1151enum {
1152 IPV6_SADDR_RULE_INIT = 0,
1153 IPV6_SADDR_RULE_LOCAL,
1154 IPV6_SADDR_RULE_SCOPE,
1155 IPV6_SADDR_RULE_PREFERRED,
1156#ifdef CONFIG_IPV6_MIP6
1157 IPV6_SADDR_RULE_HOA,
1158#endif
1159 IPV6_SADDR_RULE_OIF,
1160 IPV6_SADDR_RULE_LABEL,
a9b05723 1161 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1162 IPV6_SADDR_RULE_ORCHID,
1163 IPV6_SADDR_RULE_PREFIX,
1164 IPV6_SADDR_RULE_MAX
1165};
1166
072047e4 1167struct ipv6_saddr_score {
a9b05723
YH		 1168 int rule;
1169 int addr_type;
1170 struct inet6_ifaddr *ifa;
1171 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1172 int scopedist;
1173 int matchlen;
072047e4
YH		 1174};
1175
a9b05723 1176struct ipv6_saddr_dst {
9acd9f3a 1177 const struct in6_addr *addr;
a9b05723
YH		 1178 int ifindex;
1179 int scope;
1180 int label;
7cbca67c 1181 unsigned int prefs;
a9b05723 1182};
072047e4 1183
b6f99a21 1184static inline int ipv6_saddr_preferred(int type)
1da177e4 1185{
45bb0060 1186 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1187 return 1;
1188 return 0;
1da177e4
LT		 1189}
1190
3de23255
BT		 1191static int ipv6_get_saddr_eval(struct net *net,
1192 struct ipv6_saddr_score *score,
a9b05723
YH		 1193 struct ipv6_saddr_dst *dst,
1194 int i)
1195{
1196 int ret;
1197
1198 if (i <= score->rule) {
1199 switch (i) {
1200 case IPV6_SADDR_RULE_SCOPE:
1201 ret = score->scopedist;
1202 break;
1203 case IPV6_SADDR_RULE_PREFIX:
1204 ret = score->matchlen;
1205 break;
1206 default:
1207 ret = !!test_bit(i, score->scorebits);
1208 }
1209 goto out;
1210 }
1211
1212 switch (i) {
1213 case IPV6_SADDR_RULE_INIT:
1214 /* Rule 0: remember if hiscore is not ready yet */
1215 ret = !!score->ifa;
1216 break;
1217 case IPV6_SADDR_RULE_LOCAL:
1218 /* Rule 1: Prefer same address */
1219 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1220 break;
1221 case IPV6_SADDR_RULE_SCOPE:
1222 /* Rule 2: Prefer appropriate scope
1223 *
1224 * ret
1225 * ^
1226 * -1 | d 15
1227 * ---+--+-+---> scope
1228 * |
1229 * | d is scope of the destination.
1230 * B-d | \
1231 * | \ <- smaller scope is better if
db9c7c39 1232 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1233 * | ret = B - scope (-1 <= scope >= d <= 15).
1234 * d-C-1 | /
1235 * |/ <- greater is better
1236 * -C / if scope is not enough for destination.
1237 * /| ret = scope - C (-1 <= d < scope <= 15).
1238 *
1239 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1240 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1241 * Assume B = 0 and we get C > 29.
1242 */
1243 ret = __ipv6_addr_src_scope(score->addr_type);
1244 if (ret >= dst->scope)
1245 ret = -ret;
1246 else
1247 ret -= 128; /* 30 is enough */
1248 score->scopedist = ret;
1249 break;
1250 case IPV6_SADDR_RULE_PREFERRED:
1251 /* Rule 3: Avoid deprecated and optimistic addresses */
1252 ret = ipv6_saddr_preferred(score->addr_type) ||
1253 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1254 break;
1255#ifdef CONFIG_IPV6_MIP6
1256 case IPV6_SADDR_RULE_HOA:
7cbca67c 1257 {
a9b05723 1258 /* Rule 4: Prefer home address */
7cbca67c
YH		 1259 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1260 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1261 break;
7cbca67c 1262 }
a9b05723
YH		 1263#endif
1264 case IPV6_SADDR_RULE_OIF:
1265 /* Rule 5: Prefer outgoing interface */
1266 ret = (!dst->ifindex ||
1267 dst->ifindex == score->ifa->idev->dev->ifindex);
1268 break;
1269 case IPV6_SADDR_RULE_LABEL:
1270 /* Rule 6: Prefer matching label */
3de23255
BT		 1271 ret = ipv6_addr_label(net,
1272 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1273 score->ifa->idev->dev->ifindex) == dst->label;
1274 break;
a9b05723 1275 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1276 {
a9b05723 1277 /* Rule 7: Prefer public address
25985edc 1278 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1279 */
7cbca67c
YH		 1280 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1281 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1282 score->ifa->idev->cnf.use_tempaddr >= 2;
1283 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1284 break;
7cbca67c 1285 }
a9b05723
YH		 1286 case IPV6_SADDR_RULE_ORCHID:
1287 /* Rule 8-: Prefer ORCHID vs ORCHID or
1288 * non-ORCHID vs non-ORCHID
1289 */
1290 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1291 ipv6_addr_orchid(dst->addr));
1292 break;
1293 case IPV6_SADDR_RULE_PREFIX:
1294 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1295 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1296 if (ret > score->ifa->prefix_len)
1297 ret = score->ifa->prefix_len;
1298 score->matchlen = ret;
a9b05723
YH		 1299 break;
1300 default:
1301 ret = 0;
1302 }
1303
1304 if (ret)
1305 __set_bit(i, score->scorebits);
1306 score->rule = i;
1307out:
1308 return ret;
1309}
1310
b3f644fc 1311int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1312 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1313 struct in6_addr *saddr)
1da177e4 1314{
a9b05723
YH		 1315 struct ipv6_saddr_score scores[2],
1316 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1317 struct ipv6_saddr_dst dst;
072047e4 1318 struct net_device *dev;
a9b05723 1319 int dst_type;
1da177e4 1320
a9b05723
YH		 1321 dst_type = __ipv6_addr_type(daddr);
1322 dst.addr = daddr;
1323 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1324 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1325 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1326 dst.prefs = prefs;
a9b05723
YH		 1327
1328 hiscore->rule = -1;
1329 hiscore->ifa = NULL;
1da177e4 1330
8814c4b5 1331 rcu_read_lock();
1da177e4 1332
c6d14c84 1333 for_each_netdev_rcu(net, dev) {
072047e4 1334 struct inet6_dev *idev;
072047e4 1335
a9b05723 1336 /* Candidate Source Address (section 4)
072047e4
YH		 1337 * - multicast and link-local destination address,
1338 * the set of candidate source address MUST only
1339 * include addresses assigned to interfaces
1340 * belonging to the same link as the outgoing
1341 * interface.
1342 * (- For site-local destination addresses, the
1343 * set of candidate source addresses MUST only
1344 * include addresses assigned to interfaces
1345 * belonging to the same site as the outgoing
1346 * interface.)
1347 */
a9b05723
YH		 1348 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1349 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1350 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1351 continue;
1da177e4 1352
1da177e4 1353 idev = __in6_dev_get(dev);
072047e4
YH		 1354 if (!idev)
1355 continue;
1356
1357 read_lock_bh(&idev->lock);
502a2ffd 1358 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1359 int i;
072047e4 1360
a9b05723 1361 /*
6b3ae80a
YH		 1362 * - Tentative Address (RFC2462 section 5.4)
1363 * - A tentative address is not considered
1364 * "assigned to an interface" in the traditional
95c385b4 1365 * sense, unless it is also flagged as optimistic.
6b3ae80a 1366 * - Candidate Source Address (section 4)
072047e4
YH		 1367 * - In any case, anycast addresses, multicast
1368 * addresses, and the unspecified address MUST
1369 * NOT be included in a candidate set.
1370 */
a9b05723
YH		 1371 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1372 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1373 continue;
a9b05723
YH		 1374
1375 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1376
1377 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1378 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1379 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1380 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1381 "assigned as unicast address on %s",
1382 dev->name);
1383 continue;
1384 }
1385
a9b05723
YH		 1386 score->rule = -1;
1387 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1388
1389 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1390 int minihiscore, miniscore;
1391
3de23255
BT		 1392 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1393 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1394
1395 if (minihiscore > miniscore) {
1396 if (i == IPV6_SADDR_RULE_SCOPE &&
1397 score->scopedist > 0) {
1398 /*
1399 * special case:
1400 * each remaining entry
1401 * has too small (not enough)
1402 * scope, because ifa entries
1403 * are sorted by their scope
1404 * values.
1405 */
1406 goto try_nextdev;
1407 }
1408 break;
1409 } else if (minihiscore < miniscore) {
a9b05723
YH		 1410 if (hiscore->ifa)
1411 in6_ifa_put(hiscore->ifa);
1412
1413 in6_ifa_hold(score->ifa);
1414
a0bffffc 1415 swap(hiscore, score);
a9b05723
YH		 1416
1417 /* restore our iterator */
1418 score->ifa = hiscore->ifa;
1419
1420 break;
1da177e4 1421 }
072047e4 1422 }
1da177e4 1423 }
a9b05723 1424try_nextdev:
072047e4 1425 read_unlock_bh(&idev->lock);
1da177e4 1426 }
8814c4b5 1427 rcu_read_unlock();
1da177e4 1428
a9b05723 1429 if (!hiscore->ifa)
072047e4 1430 return -EADDRNOTAVAIL;
1ab1457c 1431
4e3fd7a0 1432 *saddr = hiscore->ifa->addr;
a9b05723 1433 in6_ifa_put(hiscore->ifa);
072047e4 1434 return 0;
1da177e4 1435}
5e5f3f0f 1436EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1437
8965779d 1438int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1439 u32 banned_flags)
b7b1bfce
HFS		 1440{
1441 struct inet6_ifaddr *ifp;
1442 int err = -EADDRNOTAVAIL;
1443
602582ca
HFS		 1444 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1445 if (ifp->scope > IFA_LINK)
1446 break;
b7b1bfce
HFS		 1447 if (ifp->scope == IFA_LINK &&
1448 !(ifp->flags & banned_flags)) {
1449 *addr = ifp->addr;
1450 err = 0;
1451 break;
1452 }
1453 }
1454 return err;
1455}
1456
95c385b4 1457int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1458 u32 banned_flags)
1da177e4
LT		 1459{
1460 struct inet6_dev *idev;
1461 int err = -EADDRNOTAVAIL;
1462
8814c4b5 1463 rcu_read_lock();
e21e8467
SH		 1464 idev = __in6_dev_get(dev);
1465 if (idev) {
1da177e4 1466 read_lock_bh(&idev->lock);
b7b1bfce 1467 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1468 read_unlock_bh(&idev->lock);
1469 }
8814c4b5 1470 rcu_read_unlock();
1da177e4
LT		 1471 return err;
1472}
1473
1474static int ipv6_count_addresses(struct inet6_dev *idev)
1475{
1476 int cnt = 0;
1477 struct inet6_ifaddr *ifp;
1478
1479 read_lock_bh(&idev->lock);
502a2ffd 1480 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1481 cnt++;
1482 read_unlock_bh(&idev->lock);
1483 return cnt;
1484}
1485
b71d1d42 1486int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1487 const struct net_device *dev, int strict)
1da177e4 1488{
eedf042a 1489 struct inet6_ifaddr *ifp;
ddbe5032 1490 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1491
5c578aed 1492 rcu_read_lock_bh();
b67bfe0d 1493 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1494 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1495 continue;
1da177e4 1496 if (ipv6_addr_equal(&ifp->addr, addr) &&
eedf042a
SH		 1497 !(ifp->flags&IFA_F_TENTATIVE) &&
1498 (dev == NULL || ifp->idev->dev == dev ||
1499 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1500 rcu_read_unlock_bh();
1501 return 1;
1da177e4
LT		 1502 }
1503 }
5c578aed 1504
eedf042a
SH		 1505 rcu_read_unlock_bh();
1506 return 0;
1da177e4 1507}
7159039a
YH		 1508EXPORT_SYMBOL(ipv6_chk_addr);
1509
3e81c6da
DM		 1510static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1511 struct net_device *dev)
1da177e4 1512{
ddbe5032 1513 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1514 struct inet6_ifaddr *ifp;
1da177e4 1515
b67bfe0d 1516 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1517 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1518 continue;
1da177e4
LT		 1519 if (ipv6_addr_equal(&ifp->addr, addr)) {
1520 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1521 return true;
1da177e4
LT		 1522 }
1523 }
3e81c6da 1524 return false;
1da177e4
LT		 1525}
1526
7df37ff3
CB		 1527/* Compares an address/prefix_len with addresses on device @dev.
1528 * If one is found it returns true.
1529 */
1530bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1531 const unsigned int prefix_len, struct net_device *dev)
1532{
1533 struct inet6_dev *idev;
1534 struct inet6_ifaddr *ifa;
1535 bool ret = false;
1536
1537 rcu_read_lock();
1538 idev = __in6_dev_get(dev);
1539 if (idev) {
1540 read_lock_bh(&idev->lock);
1541 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1542 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1543 if (ret)
1544 break;
1545 }
1546 read_unlock_bh(&idev->lock);
1547 }
1548 rcu_read_unlock();
1549
1550 return ret;
1551}
1552EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1553
b71d1d42 1554int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1555{
1556 struct inet6_dev *idev;
1557 struct inet6_ifaddr *ifa;
1558 int onlink;
1559
1560 onlink = 0;
1561 rcu_read_lock();
1562 idev = __in6_dev_get(dev);
1563 if (idev) {
1564 read_lock_bh(&idev->lock);
502a2ffd 1565 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1566 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1567 ifa->prefix_len);
1568 if (onlink)
1569 break;
1570 }
1571 read_unlock_bh(&idev->lock);
1572 }
1573 rcu_read_unlock();
1574 return onlink;
1575}
52eeeb84
YH		 1576EXPORT_SYMBOL(ipv6_chk_prefix);
1577
9acd9f3a 1578struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1579 struct net_device *dev, int strict)
1da177e4 1580{
b79d1d54 1581 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1582 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1583
5c578aed 1584 rcu_read_lock_bh();
b67bfe0d 1585 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1586 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1587 continue;
1da177e4
LT		 1588 if (ipv6_addr_equal(&ifp->addr, addr)) {
1589 if (dev == NULL || ifp->idev->dev == dev ||
1590 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1591 result = ifp;
1da177e4
LT		 1592 in6_ifa_hold(ifp);
1593 break;
1594 }
1595 }
1596 }
5c578aed 1597 rcu_read_unlock_bh();
1da177e4 1598
b79d1d54 1599 return result;
1da177e4
LT		 1600}
1601
1da177e4
LT		 1602/* Gets referenced address, destroys ifaddr */
1603
cc411d0b 1604static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1605{
1da177e4
LT		 1606 if (ifp->flags&IFA_F_PERMANENT) {
1607 spin_lock_bh(&ifp->lock);
c15b1cca 1608 addrconf_del_dad_work(ifp);
1da177e4 1609 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1610 if (dad_failed)
1611 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1612 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1613 if (dad_failed)
1614 ipv6_ifa_notify(0, ifp);
1da177e4 1615 in6_ifa_put(ifp);
1da177e4
LT		 1616 } else if (ifp->flags&IFA_F_TEMPORARY) {
1617 struct inet6_ifaddr *ifpub;
1618 spin_lock_bh(&ifp->lock);
1619 ifpub = ifp->ifpub;
1620 if (ifpub) {
1621 in6_ifa_hold(ifpub);
1622 spin_unlock_bh(&ifp->lock);
1623 ipv6_create_tempaddr(ifpub, ifp);
1624 in6_ifa_put(ifpub);
1625 } else {
1626 spin_unlock_bh(&ifp->lock);
1627 }
1628 ipv6_del_addr(ifp);
c15b1cca 1629 } else {
1da177e4 1630 ipv6_del_addr(ifp);
c15b1cca 1631 }
1da177e4
LT		 1632}
1633
f2344a13
HX		 1634static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1635{
1636 int err = -ENOENT;
1637
c15b1cca 1638 spin_lock_bh(&ifp->state_lock);
f2344a13
HX		 1639 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1640 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1641 err = 0;
1642 }
c15b1cca 1643 spin_unlock_bh(&ifp->state_lock);
f2344a13
HX		 1644
1645 return err;
1646}
1647
3c21edbd
YH		 1648void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1649{
1b34be74 1650 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1651
853dc2e0
UB		 1652 if (addrconf_dad_end(ifp)) {
1653 in6_ifa_put(ifp);
f2344a13 1654 return;
853dc2e0 1655 }
f2344a13 1656
e87cc472
JP		 1657 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1658 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1659
1b34be74
YH		 1660 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1661 struct in6_addr addr;
1662
1663 addr.s6_addr32[0] = htonl(0xfe800000);
1664 addr.s6_addr32[1] = 0;
1665
1666 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1667 ipv6_addr_equal(&ifp->addr, &addr)) {
1668 /* DAD failed for link-local based on MAC address */
1669 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1670
f3213831 1671 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1672 ifp->idev->dev->name);
1b34be74
YH		 1673 }
1674 }
1675
c15b1cca
HFS		 1676 spin_lock_bh(&ifp->state_lock);
1677 /* transition from _POSTDAD to _ERRDAD */
1678 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1679 spin_unlock_bh(&ifp->state_lock);
1680
1681 addrconf_mod_dad_work(ifp, 0);
3c21edbd 1682}
1da177e4
LT		 1683
1684/* Join to solicited addr multicast group. */
1685
b71d1d42 1686void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1687{
1688 struct in6_addr maddr;
1689
c15b1cca
HFS		 1690 ASSERT_RTNL();
1691
1da177e4
LT		 1692 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1693 return;
1694
1695 addrconf_addr_solict_mult(addr, &maddr);
1696 ipv6_dev_mc_inc(dev, &maddr);
1697}
1698
b71d1d42 1699void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1700{
1701 struct in6_addr maddr;
1702
c15b1cca
HFS		 1703 ASSERT_RTNL();
1704
1da177e4
LT		 1705 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1706 return;
1707
1708 addrconf_addr_solict_mult(addr, &maddr);
1709 __ipv6_dev_mc_dec(idev, &maddr);
1710}
1711
20380731 1712static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1713{
1714 struct in6_addr addr;
c15b1cca
HFS		 1715
1716 ASSERT_RTNL();
1717
88ad3149 1718 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 1719 return;
1da177e4
LT		 1720 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1721 if (ipv6_addr_any(&addr))
1722 return;
1723 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1724}
1725
20380731 1726static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1727{
1728 struct in6_addr addr;
c15b1cca
HFS		 1729
1730 ASSERT_RTNL();
1731
88ad3149 1732 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 1733 return;
1da177e4
LT		 1734 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1735 if (ipv6_addr_any(&addr))
1736 return;
1737 __ipv6_dev_ac_dec(ifp->idev, &addr);
1738}
1739
073a8e0e
YH		 1740static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1741{
1742 if (dev->addr_len != ETH_ALEN)
1743 return -1;
1744 memcpy(eui, dev->dev_addr, 3);
1745 memcpy(eui + 5, dev->dev_addr + 3, 3);
1746
1747 /*
1748 * The zSeries OSA network cards can be shared among various
1749 * OS instances, but the OSA cards have only one MAC address.
1750 * This leads to duplicate address conflicts in conjunction
1751 * with IPv6 if more than one instance uses the same card.
1752 *
1753 * The driver for these cards can deliver a unique 16-bit
1754 * identifier for each instance sharing the same card. It is
1755 * placed instead of 0xFFFE in the interface identifier. The
1756 * "u" bit of the interface identifier is not inverted in this
1757 * case. Hence the resulting interface identifier has local
1758 * scope according to RFC2373.
1759 */
1760 if (dev->dev_id) {
1761 eui[3] = (dev->dev_id >> 8) & 0xFF;
1762 eui[4] = dev->dev_id & 0xFF;
1763 } else {
1764 eui[3] = 0xFF;
1765 eui[4] = 0xFE;
1766 eui[0] ^= 2;
1767 }
1768 return 0;
1769}
1770
06a4c1c5 1771static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1772{
1773 if (dev->addr_len != IEEE802154_ADDR_LEN)
1774 return -1;
1775 memcpy(eui, dev->dev_addr, 8);
5e98a36e 1776 eui[0] ^= 2;
06a4c1c5 1777 return 0;
1778}
1779
cb6bf355
YH		 1780static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1781{
1782 union fwnet_hwaddr *ha;
1783
1784 if (dev->addr_len != FWNET_ALEN)
1785 return -1;
1786
1787 ha = (union fwnet_hwaddr *)dev->dev_addr;
1788
1789 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1790 eui[0] ^= 2;
1791 return 0;
1792}
1793
073a8e0e
YH		 1794static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1795{
1796 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1797 if (dev->addr_len != ARCNET_ALEN)
1798 return -1;
1799 memset(eui, 0, 7);
8e5e8f30 1800 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1801 return 0;
1802}
1803
1804static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1805{
1806 if (dev->addr_len != INFINIBAND_ALEN)
1807 return -1;
1808 memcpy(eui, dev->dev_addr + 12, 8);
1809 eui[0] |= 2;
1810 return 0;
1811}
1812
c61393ea 1813static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1814{
9af28511
SH		 1815 if (addr == 0)
1816 return -1;
dfd982ba
YH		 1817 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1818 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1819 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1820 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1821 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1822 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1823 eui[1] = 0;
1824 eui[2] = 0x5E;
1825 eui[3] = 0xFE;
1826 memcpy(eui + 4, &addr, 4);
1827 return 0;
1828}
dfd982ba
YH		 1829
1830static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1831{
1832 if (dev->priv_flags & IFF_ISATAP)
1833 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1834 return -1;
1835}
1836
aee80b54 1837static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1838{
1839 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1840}
1841
e837735e
ND		 1842static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1843{
1844 memcpy(eui, dev->perm_addr, 3);
1845 memcpy(eui + 5, dev->perm_addr + 3, 3);
1846 eui[3] = 0xFF;
1847 eui[4] = 0xFE;
1848 eui[0] ^= 2;
1849 return 0;
1850}
1851
1da177e4
LT		 1852static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1853{
1854 switch (dev->type) {
1855 case ARPHRD_ETHER:
1856 case ARPHRD_FDDI:
073a8e0e 1857 return addrconf_ifid_eui48(eui, dev);
1da177e4 1858 case ARPHRD_ARCNET:
073a8e0e 1859 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1860 case ARPHRD_INFINIBAND:
073a8e0e 1861 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1862 case ARPHRD_SIT:
dfd982ba 1863 return addrconf_ifid_sit(eui, dev);
aee80b54 1864 case ARPHRD_IPGRE:
1865 return addrconf_ifid_gre(eui, dev);
e74bccb8 1866 case ARPHRD_6LOWPAN:
06a4c1c5 1867 case ARPHRD_IEEE802154:
1868 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 1869 case ARPHRD_IEEE1394:
1870 return addrconf_ifid_ieee1394(eui, dev);
e837735e
ND		 1871 case ARPHRD_TUNNEL6:
1872 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 1873 }
1874 return -1;
1875}
1876
1877static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1878{
1879 int err = -1;
1880 struct inet6_ifaddr *ifp;
1881
1882 read_lock_bh(&idev->lock);
602582ca
HFS		 1883 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1884 if (ifp->scope > IFA_LINK)
1885 break;
1da177e4
LT		 1886 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1887 memcpy(eui, ifp->addr.s6_addr+8, 8);
1888 err = 0;
1889 break;
1890 }
1891 }
1892 read_unlock_bh(&idev->lock);
1893 return err;
1894}
1895
1da177e4 1896/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 1897static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 1898{
1da177e4 1899regen:
955189ef 1900 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1901 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1902
1903 /*
1904 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1905 * check if generated address is not inappropriate
1906 *
1907 * - Reserved subnet anycast (RFC 2526)
1908 * 11111101 11....11 1xxxxxxx
c7dc89c0 1909 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1910 * 00-00-5E-FE-xx-xx-xx-xx
1911 * - value 0
1912 * - XXX: already assigned to an address on the device
1913 */
1ab1457c 1914 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1915 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1916 (idev->rndid[7]&0x80))
1917 goto regen;
1918 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1919 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1920 goto regen;
1921 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1922 goto regen;
1923 }
1da177e4
LT		 1924}
1925
1926static void ipv6_regen_rndid(unsigned long data)
1927{
1928 struct inet6_dev *idev = (struct inet6_dev *) data;
1929 unsigned long expires;
1930
8814c4b5 1931 rcu_read_lock_bh();
1da177e4
LT		 1932 write_lock_bh(&idev->lock);
1933
1934 if (idev->dead)
1935 goto out;
1936
eb7e0575 1937 __ipv6_regen_rndid(idev);
1ab1457c 1938
1da177e4 1939 expires = jiffies +
1ab1457c 1940 idev->cnf.temp_prefered_lft * HZ -
1f9248e5
JP		 1941 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
1942 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
784e2710 1943 idev->cnf.max_desync_factor * HZ;
1da177e4 1944 if (time_before(expires, jiffies)) {
f3213831
JP		 1945 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1946 __func__, idev->dev->name);
1da177e4
LT		 1947 goto out;
1948 }
1949
1950 if (!mod_timer(&idev->regen_timer, expires))
1951 in6_dev_hold(idev);
1952
1953out:
1954 write_unlock_bh(&idev->lock);
8814c4b5 1955 rcu_read_unlock_bh();
1da177e4
LT		 1956 in6_dev_put(idev);
1957}
1958
eb7e0575 1959static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 1960{
1da177e4 1961 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 1962 __ipv6_regen_rndid(idev);
1da177e4 1963}
1da177e4
LT		 1964
1965/*
1966 * Add prefix route.
1967 */
1968
1969static void
1970addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1971 unsigned long expires, u32 flags)
1da177e4 1972{
86872cb5
TG		 1973 struct fib6_config cfg = {
1974 .fc_table = RT6_TABLE_PREFIX,
1975 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1976 .fc_ifindex = dev->ifindex,
1977 .fc_expires = expires,
1978 .fc_dst_len = plen,
1979 .fc_flags = RTF_UP | flags,
c346dca1 1980 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1981 .fc_protocol = RTPROT_KERNEL,
86872cb5 1982 };
1da177e4 1983
4e3fd7a0 1984 cfg.fc_dst = *pfx;
1da177e4
LT		 1985
1986 /* Prevent useless cloning on PtP SIT.
1987 This thing is done here expecting that the whole
1988 class of non-broadcast devices need not cloning.
1989 */
07a93626 1990#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 1991 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1992 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1993#endif
1da177e4 1994
86872cb5 1995 ip6_route_add(&cfg);
1da177e4
LT		 1996}
1997
14ef37b6
AH		 1998
1999static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2000 int plen,
2001 const struct net_device *dev,
2002 u32 flags, u32 noflags)
2003{
2004 struct fib6_node *fn;
2005 struct rt6_info *rt = NULL;
2006 struct fib6_table *table;
2007
2008 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
2009 if (table == NULL)
2010 return NULL;
2011
5744dd9b 2012 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2013 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2014 if (!fn)
2015 goto out;
2016 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2017 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2018 continue;
2019 if ((rt->rt6i_flags & flags) != flags)
2020 continue;
85da53bf 2021 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2022 continue;
2023 dst_hold(&rt->dst);
2024 break;
2025 }
2026out:
5744dd9b 2027 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2028 return rt;
2029}
2030
2031
1da177e4
LT		 2032/* Create "default" multicast route to the interface */
2033
2034static void addrconf_add_mroute(struct net_device *dev)
2035{
86872cb5
TG		 2036 struct fib6_config cfg = {
2037 .fc_table = RT6_TABLE_LOCAL,
2038 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2039 .fc_ifindex = dev->ifindex,
2040 .fc_dst_len = 8,
2041 .fc_flags = RTF_UP,
c346dca1 2042 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2043 };
2044
2045 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2046
2047 ip6_route_add(&cfg);
1da177e4
LT		 2048}
2049
1da177e4
LT		 2050static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2051{
2052 struct inet6_dev *idev;
2053
2054 ASSERT_RTNL();
2055
e21e8467
SH		 2056 idev = ipv6_find_idev(dev);
2057 if (!idev)
64e724f6
BH		 2058 return ERR_PTR(-ENOBUFS);
2059
2060 if (idev->cnf.disable_ipv6)
2061 return ERR_PTR(-EACCES);
1da177e4
LT		 2062
2063 /* Add default multicast route */
4af04aba
LW		 2064 if (!(dev->flags & IFF_LOOPBACK))
2065 addrconf_add_mroute(dev);
1da177e4 2066
1da177e4
LT		 2067 return idev;
2068}
2069
53bd6749
JP		 2070static void manage_tempaddrs(struct inet6_dev *idev,
2071 struct inet6_ifaddr *ifp,
2072 __u32 valid_lft, __u32 prefered_lft,
2073 bool create, unsigned long now)
2074{
2075 u32 flags;
2076 struct inet6_ifaddr *ift;
2077
2078 read_lock_bh(&idev->lock);
2079 /* update all temporary addresses in the list */
2080 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2081 int age, max_valid, max_prefered;
2082
2083 if (ifp != ift->ifpub)
2084 continue;
2085
2086 /* RFC 4941 section 3.3:
2087 * If a received option will extend the lifetime of a public
2088 * address, the lifetimes of temporary addresses should
2089 * be extended, subject to the overall constraint that no
2090 * temporary addresses should ever remain "valid" or "preferred"
2091 * for a time longer than (TEMP_VALID_LIFETIME) or
2092 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2093 */
2094 age = (now - ift->cstamp) / HZ;
2095 max_valid = idev->cnf.temp_valid_lft - age;
2096 if (max_valid < 0)
2097 max_valid = 0;
2098
2099 max_prefered = idev->cnf.temp_prefered_lft -
2100 idev->cnf.max_desync_factor - age;
2101 if (max_prefered < 0)
2102 max_prefered = 0;
2103
2104 if (valid_lft > max_valid)
2105 valid_lft = max_valid;
2106
2107 if (prefered_lft > max_prefered)
2108 prefered_lft = max_prefered;
2109
2110 spin_lock(&ift->lock);
2111 flags = ift->flags;
2112 ift->valid_lft = valid_lft;
2113 ift->prefered_lft = prefered_lft;
2114 ift->tstamp = now;
2115 if (prefered_lft > 0)
2116 ift->flags &= ~IFA_F_DEPRECATED;
2117
2118 spin_unlock(&ift->lock);
2119 if (!(flags&IFA_F_TENTATIVE))
2120 ipv6_ifa_notify(0, ift);
2121 }
2122
2123 if ((create || list_empty(&idev->tempaddr_list)) &&
2124 idev->cnf.use_tempaddr > 0) {
2125 /* When a new public address is created as described
2126 * in [ADDRCONF], also create a new temporary address.
2127 * Also create a temporary address if it's enabled but
2128 * no temporary address currently exists.
2129 */
2130 read_unlock_bh(&idev->lock);
2131 ipv6_create_tempaddr(ifp, NULL);
2132 } else {
2133 read_unlock_bh(&idev->lock);
2134 }
2135}
2136
e6bff995 2137void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2138{
2139 struct prefix_info *pinfo;
2140 __u32 valid_lft;
2141 __u32 prefered_lft;
2142 int addr_type;
1da177e4 2143 struct inet6_dev *in6_dev;
56d417b1 2144 struct net *net = dev_net(dev);
1da177e4
LT		 2145
2146 pinfo = (struct prefix_info *) opt;
1ab1457c 2147
1da177e4 2148 if (len < sizeof(struct prefix_info)) {
ba3542e1 2149 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2150 return;
2151 }
1ab1457c 2152
1da177e4
LT		 2153 /*
2154 * Validation checks ([ADDRCONF], page 19)
2155 */
2156
2157 addr_type = ipv6_addr_type(&pinfo->prefix);
2158
2159 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2160 return;
2161
2162 valid_lft = ntohl(pinfo->valid);
2163 prefered_lft = ntohl(pinfo->prefered);
2164
2165 if (prefered_lft > valid_lft) {
e87cc472 2166 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2167 return;
2168 }
2169
2170 in6_dev = in6_dev_get(dev);
2171
2172 if (in6_dev == NULL) {
e87cc472
JP		 2173 net_dbg_ratelimited("addrconf: device %s not configured\n",
2174 dev->name);
1da177e4
LT		 2175 return;
2176 }
2177
2178 /*
2179 * Two things going on here:
2180 * 1) Add routes for on-link prefixes
2181 * 2) Configure prefixes with the auto flag set
2182 */
2183
4bed72e4
YH		 2184 if (pinfo->onlink) {
2185 struct rt6_info *rt;
2186 unsigned long rt_expires;
2187
6f704992
YH		 2188 /* Avoid arithmetic overflow. Really, we could
2189 * save rt_expires in seconds, likely valid_lft,
2190 * but it would require division in fib gc, that it
2191 * not good.
2192 */
4bed72e4
YH		 2193 if (HZ > USER_HZ)
2194 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2195 else
2196 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2197
4bed72e4
YH		 2198 if (addrconf_finite_timeout(rt_expires))
2199 rt_expires *= HZ;
1da177e4 2200
14ef37b6
AH		 2201 rt = addrconf_get_prefix_route(&pinfo->prefix,
2202 pinfo->prefix_len,
2203 dev,
2204 RTF_ADDRCONF | RTF_PREFIX_RT,
2205 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2206
14ef37b6 2207 if (rt) {
6f704992
YH		 2208 /* Autoconf prefix route */
2209 if (valid_lft == 0) {
2210 ip6_del_rt(rt);
2211 rt = NULL;
4bed72e4 2212 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2213 /* not infinity */
1716a961 2214 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2215 } else {
1716a961 2216 rt6_clean_expires(rt);
1da177e4
LT		 2217 }
2218 } else if (valid_lft) {
6f704992 2219 clock_t expires = 0;
4bed72e4
YH		 2220 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2221 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2222 /* not infinity */
2223 flags |= RTF_EXPIRES;
2224 expires = jiffies_to_clock_t(rt_expires);
2225 }
1da177e4 2226 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2227 dev, expires, flags);
1da177e4 2228 }
94e187c0 2229 ip6_rt_put(rt);
1da177e4
LT		 2230 }
2231
2232 /* Try to figure out our local address for this prefix */
2233
2234 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2235 struct inet6_ifaddr *ifp;
1da177e4
LT		 2236 struct in6_addr addr;
2237 int create = 0, update_lft = 0;
617fe29d 2238 bool tokenized = false;
1da177e4
LT		 2239
2240 if (pinfo->prefix_len == 64) {
2241 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2242
2243 if (!ipv6_addr_any(&in6_dev->token)) {
2244 read_lock_bh(&in6_dev->lock);
2245 memcpy(addr.s6_addr + 8,
2246 in6_dev->token.s6_addr + 8, 8);
2247 read_unlock_bh(&in6_dev->lock);
617fe29d 2248 tokenized = true;
f53adae4
DB		 2249 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2250 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1da177e4
LT		 2251 in6_dev_put(in6_dev);
2252 return;
2253 }
2254 goto ok;
2255 }
e87cc472
JP		 2256 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2257 pinfo->prefix_len);
1da177e4
LT		 2258 in6_dev_put(in6_dev);
2259 return;
2260
2261ok:
2262
53b7997f 2263 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 2264
2265 if (ifp == NULL && valid_lft) {
2266 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2267 u32 addr_flags = 0;
2268
2269#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2270 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2271 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 2272 addr_flags = IFA_F_OPTIMISTIC;
2273#endif
1da177e4
LT		 2274
2275 /* Do not allow to create too much of autoconfigured
2276 * addresses; this would be too easy way to crash kernel.
2277 */
2278 if (!max_addresses ||
2279 ipv6_count_addresses(in6_dev) < max_addresses)
3f8f5298
JP		 2280 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2281 pinfo->prefix_len,
95c385b4 2282 addr_type&IPV6_ADDR_SCOPE_MASK,
8a226b2c
JB		 2283 addr_flags, valid_lft,
2284 prefered_lft);
1da177e4 2285
3f0d2ba0 2286 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2287 in6_dev_put(in6_dev);
2288 return;
2289 }
2290
8a226b2c
JB		 2291 update_lft = 0;
2292 create = 1;
c15b1cca
HFS		 2293 spin_lock_bh(&ifp->lock);
2294 ifp->flags |= IFA_F_MANAGETEMPADDR;
1da177e4 2295 ifp->cstamp = jiffies;
617fe29d 2296 ifp->tokenized = tokenized;
c15b1cca 2297 spin_unlock_bh(&ifp->lock);
cf22f9a2 2298 addrconf_dad_start(ifp);
1da177e4
LT		 2299 }
2300
2301 if (ifp) {
479840ff 2302 u32 flags;
1da177e4 2303 unsigned long now;
1da177e4
LT		 2304 u32 stored_lft;
2305
2306 /* update lifetime (RFC2462 5.5.3 e) */
2307 spin_lock(&ifp->lock);
2308 now = jiffies;
2309 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2310 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2311 else
2312 stored_lft = 0;
8a226b2c 2313 if (!update_lft && !create && stored_lft) {
c9d55d5b
PM		 2314 const u32 minimum_lft = min(
2315 stored_lft, (u32)MIN_VALID_LIFETIME);
2316 valid_lft = max(valid_lft, minimum_lft);
2317
2318 /* RFC4862 Section 5.5.3e:
2319 * "Note that the preferred lifetime of the
2320 * corresponding address is always reset to
2321 * the Preferred Lifetime in the received
2322 * Prefix Information option, regardless of
2323 * whether the valid lifetime is also reset or
2324 * ignored."
2325 *
2326 * So we should always update prefered_lft here.
2327 */
2328 update_lft = 1;
1da177e4
LT		 2329 }
2330
2331 if (update_lft) {
2332 ifp->valid_lft = valid_lft;
2333 ifp->prefered_lft = prefered_lft;
2334 ifp->tstamp = now;
2335 flags = ifp->flags;
2336 ifp->flags &= ~IFA_F_DEPRECATED;
2337 spin_unlock(&ifp->lock);
2338
2339 if (!(flags&IFA_F_TENTATIVE))
2340 ipv6_ifa_notify(0, ifp);
2341 } else
2342 spin_unlock(&ifp->lock);
2343
53bd6749
JP		 2344 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2345 create, now);
5d9efa7e 2346
1da177e4 2347 in6_ifa_put(ifp);
c15b1cca 2348 addrconf_verify();
1da177e4
LT		 2349 }
2350 }
2351 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2352 in6_dev_put(in6_dev);
2353}
2354
2355/*
2356 * Set destination address.
2357 * Special case for SIT interfaces where we create a new "virtual"
2358 * device.
2359 */
af284937 2360int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2361{
2362 struct in6_ifreq ireq;
2363 struct net_device *dev;
2364 int err = -EINVAL;
2365
2366 rtnl_lock();
2367
2368 err = -EFAULT;
2369 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2370 goto err_exit;
2371
af284937 2372 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2373
2374 err = -ENODEV;
2375 if (dev == NULL)
2376 goto err_exit;
2377
07a93626 2378#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2379 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2380 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2381 struct ifreq ifr;
1da177e4
LT		 2382 struct ip_tunnel_parm p;
2383
2384 err = -EADDRNOTAVAIL;
2385 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2386 goto err_exit;
2387
2388 memset(&p, 0, sizeof(p));
2389 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2390 p.iph.saddr = 0;
2391 p.iph.version = 4;
2392 p.iph.ihl = 5;
2393 p.iph.protocol = IPPROTO_IPV6;
2394 p.iph.ttl = 64;
d20b3109 2395 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2396
5bc3eb7e
SH		 2397 if (ops->ndo_do_ioctl) {
2398 mm_segment_t oldfs = get_fs();
2399
2400 set_fs(KERNEL_DS);
2401 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2402 set_fs(oldfs);
2403 } else
2404 err = -EOPNOTSUPP;
1da177e4
LT		 2405
2406 if (err == 0) {
2407 err = -ENOBUFS;
af284937
DL		 2408 dev = __dev_get_by_name(net, p.name);
2409 if (!dev)
1da177e4
LT		 2410 goto err_exit;
2411 err = dev_open(dev);
2412 }
2413 }
0be669bb 2414#endif
1da177e4
LT		 2415
2416err_exit:
2417 rtnl_unlock();
2418 return err;
2419}
2420
2421/*
2422 * Manual configuration of address on an interface
2423 */
479840ff
JP		 2424static int inet6_addr_add(struct net *net, int ifindex,
2425 const struct in6_addr *pfx,
caeaba79 2426 const struct in6_addr *peer_pfx,
479840ff
JP		 2427 unsigned int plen, __u32 ifa_flags,
2428 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2429{
2430 struct inet6_ifaddr *ifp;
2431 struct inet6_dev *idev;
2432 struct net_device *dev;
2433 int scope;
6f704992
YH		 2434 u32 flags;
2435 clock_t expires;
4bed72e4 2436 unsigned long timeout;
1da177e4
LT		 2437
2438 ASSERT_RTNL();
1ab1457c 2439
24ef0da7
TG		 2440 if (plen > 128)
2441 return -EINVAL;
2442
0778769d
NT		 2443 /* check the lifetime */
2444 if (!valid_lft || prefered_lft > valid_lft)
2445 return -EINVAL;
2446
53bd6749
JP		 2447 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2448 return -EINVAL;
2449
af284937
DL		 2450 dev = __dev_get_by_index(net, ifindex);
2451 if (!dev)
1da177e4 2452 return -ENODEV;
1ab1457c 2453
64e724f6
BH		 2454 idev = addrconf_add_dev(dev);
2455 if (IS_ERR(idev))
2456 return PTR_ERR(idev);
1da177e4
LT		 2457
2458 scope = ipv6_addr_scope(pfx);
2459
4bed72e4
YH		 2460 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2461 if (addrconf_finite_timeout(timeout)) {
2462 expires = jiffies_to_clock_t(timeout * HZ);
2463 valid_lft = timeout;
6f704992 2464 flags = RTF_EXPIRES;
4bed72e4
YH		 2465 } else {
2466 expires = 0;
2467 flags = 0;
2468 ifa_flags |= IFA_F_PERMANENT;
6f704992 2469 }
0778769d 2470
4bed72e4
YH		 2471 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2472 if (addrconf_finite_timeout(timeout)) {
2473 if (timeout == 0)
2474 ifa_flags |= IFA_F_DEPRECATED;
2475 prefered_lft = timeout;
2476 }
0778769d 2477
8a226b2c
JB		 2478 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2479 valid_lft, prefered_lft);
0778769d 2480
1da177e4 2481 if (!IS_ERR(ifp)) {
761aac73
TH		 2482 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2483 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2484 expires, flags);
2485 }
2486
95c385b4
NH		 2487 /*
2488 * Note that section 3.1 of RFC 4429 indicates
2489 * that the Optimistic flag should not be set for
2490 * manually configured addresses
2491 */
cf22f9a2 2492 addrconf_dad_start(ifp);
53bd6749
JP		 2493 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2494 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2495 true, jiffies);
1da177e4 2496 in6_ifa_put(ifp);
c15b1cca 2497 addrconf_verify_rtnl();
1da177e4
LT		 2498 return 0;
2499 }
2500
2501 return PTR_ERR(ifp);
2502}
2503
6046d5b4
HK		 2504static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2505 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2506{
2507 struct inet6_ifaddr *ifp;
2508 struct inet6_dev *idev;
2509 struct net_device *dev;
1ab1457c 2510
24ef0da7
TG		 2511 if (plen > 128)
2512 return -EINVAL;
2513
af284937
DL		 2514 dev = __dev_get_by_index(net, ifindex);
2515 if (!dev)
1da177e4
LT		 2516 return -ENODEV;
2517
7eaa48a4 2518 if ((idev = __in6_dev_get(dev)) == NULL)
1da177e4
LT		 2519 return -ENXIO;
2520
2521 read_lock_bh(&idev->lock);
502a2ffd 2522 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2523 if (ifp->prefix_len == plen &&
2524 ipv6_addr_equal(pfx, &ifp->addr)) {
2525 in6_ifa_hold(ifp);
2526 read_unlock_bh(&idev->lock);
1ab1457c 2527
6046d5b4
HK		 2528 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2529 (ifa_flags & IFA_F_MANAGETEMPADDR))
2530 manage_tempaddrs(idev, ifp, 0, 0, false,
2531 jiffies);
1da177e4 2532 ipv6_del_addr(ifp);
6046d5b4 2533 addrconf_verify_rtnl();
1da177e4
LT		 2534 return 0;
2535 }
2536 }
2537 read_unlock_bh(&idev->lock);
2538 return -EADDRNOTAVAIL;
2539}
2540
2541
af284937 2542int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2543{
2544 struct in6_ifreq ireq;
2545 int err;
1ab1457c 2546
af31f412 2547 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2548 return -EPERM;
1ab1457c 2549
1da177e4
LT		 2550 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2551 return -EFAULT;
2552
2553 rtnl_lock();
caeaba79 2554 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2555 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2556 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2557 rtnl_unlock();
2558 return err;
2559}
2560
af284937 2561int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2562{
2563 struct in6_ifreq ireq;
2564 int err;
1ab1457c 2565
af31f412 2566 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2567 return -EPERM;
2568
2569 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2570 return -EFAULT;
2571
2572 rtnl_lock();
6046d5b4 2573 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2574 ireq.ifr6_prefixlen);
1da177e4
LT		 2575 rtnl_unlock();
2576 return err;
2577}
2578
b5f348e5
IJ		 2579static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2580 int plen, int scope)
2581{
2582 struct inet6_ifaddr *ifp;
2583
8a226b2c 2584 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2585 scope, IFA_F_PERMANENT,
2586 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2587 if (!IS_ERR(ifp)) {
2588 spin_lock_bh(&ifp->lock);
2589 ifp->flags &= ~IFA_F_TENTATIVE;
2590 spin_unlock_bh(&ifp->lock);
2591 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2592 in6_ifa_put(ifp);
2593 }
2594}
2595
07a93626 2596#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2597static void sit_add_v4_addrs(struct inet6_dev *idev)
2598{
1da177e4
LT		 2599 struct in6_addr addr;
2600 struct net_device *dev;
c346dca1 2601 struct net *net = dev_net(idev->dev);
929c9cf3 2602 int scope, plen;
f0e2acfa 2603 u32 pflags = 0;
1da177e4
LT		 2604
2605 ASSERT_RTNL();
2606
2607 memset(&addr, 0, sizeof(struct in6_addr));
2608 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2609
2610 if (idev->dev->flags&IFF_POINTOPOINT) {
2611 addr.s6_addr32[0] = htonl(0xfe800000);
2612 scope = IFA_LINK;
929c9cf3 2613 plen = 64;
1da177e4
LT		 2614 } else {
2615 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2616 plen = 96;
f0e2acfa 2617 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2618 }
2619
2620 if (addr.s6_addr32[3]) {
929c9cf3 2621 add_addr(idev, &addr, plen, scope);
f0e2acfa 2622 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2623 return;
2624 }
2625
6fda7350 2626 for_each_netdev(net, dev) {
8e5e8f30 2627 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2628 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2629 struct in_ifaddr *ifa;
1da177e4
LT		 2630
2631 int flag = scope;
2632
2633 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2634
2635 addr.s6_addr32[3] = ifa->ifa_local;
2636
2637 if (ifa->ifa_scope == RT_SCOPE_LINK)
2638 continue;
2639 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2640 if (idev->dev->flags&IFF_POINTOPOINT)
2641 continue;
2642 flag |= IFA_HOST;
2643 }
1da177e4 2644
b5f348e5 2645 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2646 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2647 pflags);
1da177e4
LT		 2648 }
2649 }
1ab1457c 2650 }
1da177e4 2651}
0be669bb 2652#endif
1da177e4
LT		 2653
2654static void init_loopback(struct net_device *dev)
2655{
2656 struct inet6_dev *idev;
25fb6ca4
BK		 2657 struct net_device *sp_dev;
2658 struct inet6_ifaddr *sp_ifa;
2659 struct rt6_info *sp_rt;
1da177e4
LT		 2660
2661 /* ::1 */
2662
2663 ASSERT_RTNL();
2664
7eaa48a4 2665 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2666 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2667 return;
2668 }
2669
b5f348e5 2670 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2671
2672 /* Add routes to other interface's IPv6 addresses */
2673 for_each_netdev(dev_net(dev), sp_dev) {
2674 if (!strcmp(sp_dev->name, dev->name))
2675 continue;
2676
2677 idev = __in6_dev_get(sp_dev);
2678 if (!idev)
2679 continue;
2680
2681 read_lock_bh(&idev->lock);
2682 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2683
2684 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2685 continue;
2686
33d99113
G		 2687 if (sp_ifa->rt) {
2688 /* This dst has been added to garbage list when
2689 * lo device down, release this obsolete dst and
2690 * reallocate a new router for ifa.
2691 */
2692 if (sp_ifa->rt->dst.obsolete > 0) {
2693 ip6_rt_put(sp_ifa->rt);
2694 sp_ifa->rt = NULL;
2695 } else {
2696 continue;
2697 }
2698 }
a881ae1f 2699
57ec0afe 2700 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 2701
2702 /* Failure cases are ignored */
534c8779
G		 2703 if (!IS_ERR(sp_rt)) {
2704 sp_ifa->rt = sp_rt;
25fb6ca4 2705 ip6_ins_rt(sp_rt);
534c8779 2706 }
25fb6ca4
BK		 2707 }
2708 read_unlock_bh(&idev->lock);
2709 }
1da177e4
LT		 2710}
2711
b71d1d42 2712static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4 2713{
8e5e8f30 2714 struct inet6_ifaddr *ifp;
95c385b4
NH		 2715 u32 addr_flags = IFA_F_PERMANENT;
2716
2717#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2718 if (idev->cnf.optimistic_dad &&
702beb87 2719 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2720 addr_flags |= IFA_F_OPTIMISTIC;
2721#endif
1da177e4 2722
95c385b4 2723
07edd741
HFS		 2724 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2725 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 2726 if (!IS_ERR(ifp)) {
46d48046 2727 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2728 addrconf_dad_start(ifp);
1da177e4
LT		 2729 in6_ifa_put(ifp);
2730 }
2731}
2732
bc91b0f0
JP		 2733static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
2734{
2735 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
2736 struct in6_addr addr;
2737
2738 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2739 /* addrconf_add_linklocal also adds a prefix_route and we
2740 * only need to care about prefix routes if ipv6_generate_eui64
2741 * couldn't generate one.
2742 */
2743 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
2744 addrconf_add_linklocal(idev, &addr);
2745 else if (prefix_route)
2746 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
2747 }
2748}
2749
1da177e4
LT		 2750static void addrconf_dev_config(struct net_device *dev)
2751{
8e5e8f30 2752 struct inet6_dev *idev;
1da177e4
LT		 2753
2754 ASSERT_RTNL();
2755
74235a25
HX		 2756 if ((dev->type != ARPHRD_ETHER) &&
2757 (dev->type != ARPHRD_FDDI) &&
74235a25 2758 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 2759 (dev->type != ARPHRD_INFINIBAND) &&
cb6bf355 2760 (dev->type != ARPHRD_IEEE802154) &&
e837735e 2761 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8
JR		 2762 (dev->type != ARPHRD_TUNNEL6) &&
2763 (dev->type != ARPHRD_6LOWPAN)) {
74235a25
HX		 2764 /* Alas, we support only Ethernet autoconfiguration. */
2765 return;
2766 }
2767
1da177e4 2768 idev = addrconf_add_dev(dev);
64e724f6 2769 if (IS_ERR(idev))
1da177e4
LT		 2770 return;
2771
bc91b0f0 2772 addrconf_addr_gen(idev, false);
1da177e4
LT		 2773}
2774
07a93626 2775#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2776static void addrconf_sit_config(struct net_device *dev)
2777{
2778 struct inet6_dev *idev;
2779
2780 ASSERT_RTNL();
2781
1ab1457c
YH		 2782 /*
2783 * Configure the tunnel with one of our IPv4
2784 * addresses... we should configure all of
1da177e4
LT		 2785 * our v4 addrs in the tunnel
2786 */
2787
7eaa48a4 2788 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2789 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2790 return;
2791 }
2792
c7dc89c0 2793 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 2794 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 2795 return;
2796 }
2797
1da177e4
LT		 2798 sit_add_v4_addrs(idev);
2799
62b54dd9 2800 if (dev->flags&IFF_POINTOPOINT)
1da177e4 2801 addrconf_add_mroute(dev);
1da177e4 2802}
0be669bb 2803#endif
1da177e4 2804
07a93626 2805#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2806static void addrconf_gre_config(struct net_device *dev)
2807{
2808 struct inet6_dev *idev;
aee80b54 2809
aee80b54 2810 ASSERT_RTNL();
2811
7eaa48a4 2812 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2813 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 2814 return;
2815 }
2816
bc91b0f0 2817 addrconf_addr_gen(idev, true);
aee80b54 2818}
2819#endif
2820
1ab1457c 2821static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 2822 void *ptr)
1da177e4 2823{
351638e7 2824 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 2825 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2826 int run_pending = 0;
b217d616 2827 int err;
1da177e4 2828
e21e8467 2829 switch (event) {
45ba9dd2 2830 case NETDEV_REGISTER:
74235a25 2831 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2832 idev = ipv6_add_dev(dev);
2833 if (!idev)
b217d616 2834 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2835 }
2836 break;
bcdd553f 2837
1da177e4 2838 case NETDEV_UP:
3c21edbd 2839 case NETDEV_CHANGE:
c2edacf8
JV		 2840 if (dev->flags & IFF_SLAVE)
2841 break;
2842
3c21edbd 2843 if (event == NETDEV_UP) {
f24e3d65 2844 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 2845 /* device is not ready yet. */
f3213831 2846 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 2847 dev->name);
2848 break;
2849 }
99081049 2850
d31c7b8f
EP		 2851 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2852 idev = ipv6_add_dev(dev);
2853
e3ec6cfc 2854 if (idev) {
99081049 2855 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2856 run_pending = 1;
2857 }
3c21edbd 2858 } else {
f24e3d65 2859 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2860 /* device is still not ready. */
2861 break;
2862 }
2863
2864 if (idev) {
bcdd553f 2865 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2866 /* device is already configured. */
2867 break;
3c21edbd
YH		 2868 idev->if_flags |= IF_READY;
2869 }
2870
f3213831
JP		 2871 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2872 dev->name);
3c21edbd 2873
c5e33bdd 2874 run_pending = 1;
3c21edbd
YH		 2875 }
2876
e21e8467 2877 switch (dev->type) {
07a93626 2878#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2879 case ARPHRD_SIT:
2880 addrconf_sit_config(dev);
2881 break;
aee80b54 2882#endif
07a93626 2883#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 2884 case ARPHRD_IPGRE:
2885 addrconf_gre_config(dev);
2886 break;
0be669bb 2887#endif
1da177e4
LT		 2888 case ARPHRD_LOOPBACK:
2889 init_loopback(dev);
2890 break;
2891
2892 default:
2893 addrconf_dev_config(dev);
2894 break;
3ff50b79 2895 }
bcdd553f 2896
1da177e4 2897 if (idev) {
c5e33bdd
YH		 2898 if (run_pending)
2899 addrconf_dad_run(idev);
2900
bcdd553f
SH		 2901 /*
2902 * If the MTU changed during the interface down,
2903 * when the interface up, the changed MTU must be
2904 * reflected in the idev as well as routers.
1da177e4 2905 */
bcdd553f
SH		 2906 if (idev->cnf.mtu6 != dev->mtu &&
2907 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2908 rt6_mtu_change(dev, dev->mtu);
2909 idev->cnf.mtu6 = dev->mtu;
2910 }
2911 idev->tstamp = jiffies;
2912 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2913
2914 /*
2915 * If the changed mtu during down is lower than
2916 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2917 */
2918 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2919 addrconf_ifdown(dev, 1);
1da177e4
LT		 2920 }
2921 break;
2922
2923 case NETDEV_CHANGEMTU:
d31c7b8f 2924 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2925 rt6_mtu_change(dev, dev->mtu);
2926 idev->cnf.mtu6 = dev->mtu;
2927 break;
2928 }
2929
d31c7b8f
EP		 2930 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2931 idev = ipv6_add_dev(dev);
2932 if (idev)
2933 break;
2934 }
2935
bcdd553f 2936 /*
db9c7c39 2937 * if MTU under IPV6_MIN_MTU.
bcdd553f
SH		 2938 * Stop IPv6 on this interface.
2939 */
1da177e4
LT		 2940
2941 case NETDEV_DOWN:
2942 case NETDEV_UNREGISTER:
2943 /*
2944 * Remove all addresses from this interface.
2945 */
2946 addrconf_ifdown(dev, event != NETDEV_DOWN);
2947 break;
3c21edbd 2948
1da177e4 2949 case NETDEV_CHANGENAME:
1da177e4 2950 if (idev) {
5632c515 2951 snmp6_unregister_dev(idev);
408c4768 2952 addrconf_sysctl_unregister(idev);
f52295a9 2953 addrconf_sysctl_register(idev);
b217d616
HX		 2954 err = snmp6_register_dev(idev);
2955 if (err)
2956 return notifier_from_errno(err);
5632c515 2957 }
1da177e4 2958 break;
bcdd553f 2959
93d9b7d7
JP		 2960 case NETDEV_PRE_TYPE_CHANGE:
2961 case NETDEV_POST_TYPE_CHANGE:
2962 addrconf_type_change(dev, event);
75c78500 2963 break;
3ff50b79 2964 }
1da177e4
LT		 2965
2966 return NOTIFY_OK;
2967}
2968
2969/*
2970 * addrconf module should be notified of a device going up
2971 */
2972static struct notifier_block ipv6_dev_notf = {
2973 .notifier_call = addrconf_notify,
1da177e4
LT		 2974};
2975
93d9b7d7 2976static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2977{
2978 struct inet6_dev *idev;
2979 ASSERT_RTNL();
2980
2981 idev = __in6_dev_get(dev);
2982
93d9b7d7 2983 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2984 ipv6_mc_remap(idev);
93d9b7d7 2985 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2986 ipv6_mc_unmap(idev);
2987}
2988
1da177e4
LT		 2989static int addrconf_ifdown(struct net_device *dev, int how)
2990{
c346dca1 2991 struct net *net = dev_net(dev);
502a2ffd 2992 struct inet6_dev *idev;
2993 struct inet6_ifaddr *ifa;
73a8bd74 2994 int state, i;
1da177e4
LT		 2995
2996 ASSERT_RTNL();
2997
73a8bd74
DM		 2998 rt6_ifdown(net, dev);
2999 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3000
3001 idev = __in6_dev_get(dev);
3002 if (idev == NULL)
3003 return -ENODEV;
3004
bcdd553f
SH		 3005 /*
3006 * Step 1: remove reference to ipv6 device from parent device.
3007 * Do not dev_put!
1da177e4 3008 */
439e2385 3009 if (how) {
1da177e4 3010 idev->dead = 1;
8814c4b5
YH		 3011
3012 /* protected by rtnl_lock */
a9b3cd7f 3013 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3014
3015 /* Step 1.5: remove snmp6 entry */
3016 snmp6_unregister_dev(idev);
3017
3018 }
3019
73a8bd74
DM		 3020 /* Step 2: clear hash table */
3021 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3022 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3023
3024 spin_lock_bh(&addrconf_hash_lock);
3025 restart:
b67bfe0d 3026 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74
DM		 3027 if (ifa->idev == idev) {
3028 hlist_del_init_rcu(&ifa->addr_lst);
c15b1cca 3029 addrconf_del_dad_work(ifa);
73a8bd74
DM		 3030 goto restart;
3031 }
3032 }
3033 spin_unlock_bh(&addrconf_hash_lock);
3034 }
3035
1da177e4
LT		 3036 write_lock_bh(&idev->lock);
3037
b7b1bfce
HFS		 3038 addrconf_del_rs_timer(idev);
3039
bcdd553f 3040 /* Step 2: clear flags for stateless addrconf */
439e2385 3041 if (!how)
3c21edbd 3042 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3043
439e2385 3044 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 3045 in6_dev_put(idev);
3046
bcdd553f 3047 /* Step 3: clear tempaddr list */
372e6c8f 3048 while (!list_empty(&idev->tempaddr_list)) {
3049 ifa = list_first_entry(&idev->tempaddr_list,
3050 struct inet6_ifaddr, tmp_list);
3051 list_del(&ifa->tmp_list);
1da177e4
LT		 3052 write_unlock_bh(&idev->lock);
3053 spin_lock_bh(&ifa->lock);
3054
3055 if (ifa->ifpub) {
3056 in6_ifa_put(ifa->ifpub);
3057 ifa->ifpub = NULL;
3058 }
3059 spin_unlock_bh(&ifa->lock);
3060 in6_ifa_put(ifa);
3061 write_lock_bh(&idev->lock);
3062 }
8f37ada5 3063
502a2ffd 3064 while (!list_empty(&idev->addr_list)) {
3065 ifa = list_first_entry(&idev->addr_list,
3066 struct inet6_ifaddr, if_list);
c15b1cca 3067 addrconf_del_dad_work(ifa);
84e8b803 3068
73a8bd74 3069 list_del(&ifa->if_list);
84e8b803 3070
73a8bd74 3071 write_unlock_bh(&idev->lock);
84e8b803 3072
73a8bd74
DM		 3073 spin_lock_bh(&ifa->state_lock);
3074 state = ifa->state;
3075 ifa->state = INET6_IFADDR_STATE_DEAD;
3076 spin_unlock_bh(&ifa->state_lock);
9d82ca98 3077
73a8bd74
DM		 3078 if (state != INET6_IFADDR_STATE_DEAD) {
3079 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3080 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 3081 }
73a8bd74 3082 in6_ifa_put(ifa);
8f37ada5 3083
73a8bd74
DM		 3084 write_lock_bh(&idev->lock);
3085 }
8f37ada5 3086
1da177e4
LT		 3087 write_unlock_bh(&idev->lock);
3088
3089 /* Step 5: Discard multicast list */
439e2385 3090 if (how)
1da177e4
LT		 3091 ipv6_mc_destroy_dev(idev);
3092 else
3093 ipv6_mc_down(idev);
3094
1da177e4 3095 idev->tstamp = jiffies;
1ab1457c 3096
bcdd553f 3097 /* Last: Shot the device (if unregistered) */
439e2385 3098 if (how) {
408c4768 3099 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3100 neigh_parms_release(&nd_tbl, idev->nd_parms);
3101 neigh_ifdown(&nd_tbl, dev);
3102 in6_dev_put(idev);
3103 }
3104 return 0;
3105}
3106
3107static void addrconf_rs_timer(unsigned long data)
3108{
b7b1bfce 3109 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3110 struct net_device *dev = idev->dev;
b7b1bfce 3111 struct in6_addr lladdr;
1da177e4 3112
b7b1bfce 3113 write_lock(&idev->lock);
5b2a1953 3114 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3115 goto out;
3116
9ba2add3 3117 if (!ipv6_accept_ra(idev))
5b2a1953 3118 goto out;
3119
3120 /* Announcement received after solicitation was sent */
3121 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3122 goto out;
1da177e4 3123
b7b1bfce 3124 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
caf92bc4
CW		 3125 write_unlock(&idev->lock);
3126 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3127 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3128 &in6addr_linklocal_allrouters);
3129 else
caf92bc4 3130 goto put;
1da177e4 3131
caf92bc4 3132 write_lock(&idev->lock);
b7b1bfce
HFS		 3133 /* The wait after the last probe can be shorter */
3134 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3135 idev->cnf.rtr_solicits) ?
3136 idev->cnf.rtr_solicit_delay :
3137 idev->cnf.rtr_solicit_interval);
1da177e4 3138 } else {
1da177e4
LT		 3139 /*
3140 * Note: we do not support deprecated "all on-link"
3141 * assumption any longer.
3142 */
91df42be 3143 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3144 }
3145
3146out:
b7b1bfce 3147 write_unlock(&idev->lock);
caf92bc4 3148put:
b7b1bfce 3149 in6_dev_put(idev);
1da177e4
LT		 3150}
3151
3152/*
3153 * Duplicate Address Detection
3154 */
3c21edbd
YH		 3155static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3156{
3157 unsigned long rand_num;
3158 struct inet6_dev *idev = ifp->idev;
3159
95c385b4
NH		 3160 if (ifp->flags & IFA_F_OPTIMISTIC)
3161 rand_num = 0;
3162 else
63862b5b 3163 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3164
b7b1bfce 3165 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3166 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3167}
3168
c15b1cca 3169static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3170{
3171 struct inet6_dev *idev = ifp->idev;
3172 struct net_device *dev = idev->dev;
1da177e4
LT		 3173
3174 addrconf_join_solict(dev, &ifp->addr);
3175
63862b5b 3176 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3177
3178 read_lock_bh(&idev->lock);
622ccdf1 3179 spin_lock(&ifp->lock);
e9d3e084 3180 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3181 goto out;
1da177e4
LT		 3182
3183 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3184 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3185 !(ifp->flags&IFA_F_TENTATIVE) ||
3186 ifp->flags & IFA_F_NODAD) {
cc411d0b 3187 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3188 spin_unlock(&ifp->lock);
1da177e4
LT		 3189 read_unlock_bh(&idev->lock);
3190
3191 addrconf_dad_completed(ifp);
3192 return;
3193 }
3194
6732bade 3195 if (!(idev->if_flags & IF_READY)) {
21809faf 3196 spin_unlock(&ifp->lock);
6732bade 3197 read_unlock_bh(&idev->lock);
3c21edbd 3198 /*
590a9887 3199 * If the device is not ready:
3c21edbd
YH		 3200 * - keep it tentative if it is a permanent address.
3201 * - otherwise, kill it.
3202 */
3203 in6_ifa_hold(ifp);
cc411d0b 3204 addrconf_dad_stop(ifp, 0);
6732bade 3205 return;
3c21edbd 3206 }
95c385b4
NH		 3207
3208 /*
3209 * Optimistic nodes can start receiving
3210 * Frames right away
3211 */
e21e8467 3212 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 3213 ip6_ins_rt(ifp->rt);
3214
6732bade 3215 addrconf_dad_kick(ifp);
1da177e4 3216out:
622ccdf1 3217 spin_unlock(&ifp->lock);
1da177e4
LT		 3218 read_unlock_bh(&idev->lock);
3219}
3220
c15b1cca 3221static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3222{
c15b1cca
HFS		 3223 bool begin_dad = false;
3224
3225 spin_lock_bh(&ifp->state_lock);
3226 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3227 ifp->state = INET6_IFADDR_STATE_PREDAD;
3228 begin_dad = true;
3229 }
3230 spin_unlock_bh(&ifp->state_lock);
3231
3232 if (begin_dad)
3233 addrconf_mod_dad_work(ifp, 0);
3234}
3235
3236static void addrconf_dad_work(struct work_struct *w)
3237{
3238 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3239 struct inet6_ifaddr,
3240 dad_work);
1da177e4 3241 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3242 struct in6_addr mcaddr;
3243
c15b1cca
HFS		 3244 enum {
3245 DAD_PROCESS,
3246 DAD_BEGIN,
3247 DAD_ABORT,
3248 } action = DAD_PROCESS;
3249
3250 rtnl_lock();
3251
3252 spin_lock_bh(&ifp->state_lock);
3253 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3254 action = DAD_BEGIN;
3255 ifp->state = INET6_IFADDR_STATE_DAD;
3256 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3257 action = DAD_ABORT;
3258 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3259 }
3260 spin_unlock_bh(&ifp->state_lock);
3261
3262 if (action == DAD_BEGIN) {
3263 addrconf_dad_begin(ifp);
3264 goto out;
3265 } else if (action == DAD_ABORT) {
3266 addrconf_dad_stop(ifp, 1);
3267 goto out;
3268 }
3269
b7b1bfce 3270 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3271 goto out;
3272
c15b1cca 3273 write_lock_bh(&idev->lock);
122e4519 3274 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3275 write_unlock_bh(&idev->lock);
1da177e4
LT		 3276 goto out;
3277 }
21809faf 3278
3279 spin_lock(&ifp->lock);
622ccdf1
HX		 3280 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3281 spin_unlock(&ifp->lock);
c15b1cca 3282 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3283 goto out;
3284 }
3285
b7b1bfce 3286 if (ifp->dad_probes == 0) {
1da177e4
LT		 3287 /*
3288 * DAD was successful
3289 */
3290
cc411d0b 3291 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3292 spin_unlock(&ifp->lock);
c15b1cca 3293 write_unlock_bh(&idev->lock);
1da177e4
LT		 3294
3295 addrconf_dad_completed(ifp);
3296
3297 goto out;
3298 }
3299
b7b1bfce 3300 ifp->dad_probes--;
c15b1cca
HFS		 3301 addrconf_mod_dad_work(ifp,
3302 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3303 spin_unlock(&ifp->lock);
c15b1cca 3304 write_unlock_bh(&idev->lock);
1da177e4
LT		 3305
3306 /* send a neighbour solicitation for our addr */
1da177e4 3307 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3308 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3309out:
3310 in6_ifa_put(ifp);
c15b1cca 3311 rtnl_unlock();
1da177e4
LT		 3312}
3313
11ffff75
HFS		 3314/* ifp->idev must be at least read locked */
3315static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3316{
3317 struct inet6_ifaddr *ifpiter;
3318 struct inet6_dev *idev = ifp->idev;
3319
602582ca
HFS		 3320 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3321 if (ifpiter->scope > IFA_LINK)
3322 break;
11ffff75
HFS		 3323 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3324 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3325 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3326 IFA_F_PERMANENT)
3327 return false;
3328 }
3329 return true;
3330}
3331
1da177e4
LT		 3332static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3333{
e21e8467 3334 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3335 struct in6_addr lladdr;
b173ee48 3336 bool send_rs, send_mld;
b7b1bfce 3337
c15b1cca 3338 addrconf_del_dad_work(ifp);
1da177e4
LT		 3339
3340 /*
3341 * Configure the address for reception. Now it is valid.
3342 */
3343
3344 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3345
026359bc
TA		 3346 /* If added prefix is link local and we are prepared to process
3347 router advertisements, start sending router solicitations.
1da177e4
LT		 3348 */
3349
1ec047eb 3350 read_lock_bh(&ifp->idev->lock);
11ffff75 3351 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 3352 send_rs = send_mld &&
3353 ipv6_accept_ra(ifp->idev) &&
1ec047eb 3354 ifp->idev->cnf.rtr_solicits > 0 &&
b173ee48 3355 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 3356 read_unlock_bh(&ifp->idev->lock);
3357
b173ee48
HFS		 3358 /* While dad is in progress mld report's source address is in6_addrany.
3359 * Resend with proper ll now.
3360 */
3361 if (send_mld)
3362 ipv6_mc_dad_complete(ifp->idev);
3363
1ec047eb 3364 if (send_rs) {
1da177e4
LT		 3365 /*
3366 * If a host as already performed a random delay
3367 * [...] as part of DAD [...] there is no need
3368 * to delay again before sending the first RS
3369 */
1ec047eb 3370 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 3371 return;
1ec047eb 3372 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 3373
b7b1bfce
HFS		 3374 write_lock_bh(&ifp->idev->lock);
3375 spin_lock(&ifp->lock);
3376 ifp->idev->rs_probes = 1;
1da177e4 3377 ifp->idev->if_flags |= IF_RS_SENT;
b7b1bfce
HFS		 3378 addrconf_mod_rs_timer(ifp->idev,
3379 ifp->idev->cnf.rtr_solicit_interval);
3380 spin_unlock(&ifp->lock);
3381 write_unlock_bh(&ifp->idev->lock);
1da177e4
LT		 3382 }
3383}
3384
e21e8467
SH		 3385static void addrconf_dad_run(struct inet6_dev *idev)
3386{
c5e33bdd
YH		 3387 struct inet6_ifaddr *ifp;
3388
3389 read_lock_bh(&idev->lock);
502a2ffd 3390 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3391 spin_lock(&ifp->lock);
f2344a13
HX		 3392 if (ifp->flags & IFA_F_TENTATIVE &&
3393 ifp->state == INET6_IFADDR_STATE_DAD)
3394 addrconf_dad_kick(ifp);
21809faf 3395 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3396 }
3397 read_unlock_bh(&idev->lock);
3398}
3399
1da177e4
LT		 3400#ifdef CONFIG_PROC_FS
3401struct if6_iter_state {
3c40090a 3402 struct seq_net_private p;
1da177e4 3403 int bucket;
1d578303 3404 int offset;
1da177e4
LT		 3405};
3406
1d578303 3407static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3408{
3409 struct inet6_ifaddr *ifa = NULL;
3410 struct if6_iter_state *state = seq->private;
1218854a 3411 struct net *net = seq_file_net(seq);
1d578303 3412 int p = 0;
1da177e4 3413
1d578303
MM		 3414 /* initial bucket if pos is 0 */
3415 if (pos == 0) {
3416 state->bucket = 0;
3417 state->offset = 0;
3418 }
3419
3420 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3421 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3422 addr_lst) {
9f0d3c27
ED		 3423 if (!net_eq(dev_net(ifa->idev->dev), net))
3424 continue;
1d578303
MM		 3425 /* sync with offset */
3426 if (p < state->offset) {
3427 p++;
3428 continue;
3429 }
3430 state->offset++;
9f0d3c27 3431 return ifa;
1d578303
MM		 3432 }
3433
3434 /* prepare for next bucket */
3435 state->offset = 0;
3436 p = 0;
1da177e4 3437 }
c2e21293 3438 return NULL;
1da177e4
LT		 3439}
3440
c2e21293 3441static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3442 struct inet6_ifaddr *ifa)
1da177e4
LT		 3443{
3444 struct if6_iter_state *state = seq->private;
1218854a 3445 struct net *net = seq_file_net(seq);
1da177e4 3446
b67bfe0d 3447 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3448 if (!net_eq(dev_net(ifa->idev->dev), net))
3449 continue;
1d578303 3450 state->offset++;
9f0d3c27 3451 return ifa;
1d578303 3452 }
3c40090a 3453
c2e21293 3454 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3455 state->offset = 0;
b67bfe0d 3456 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3457 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3458 if (!net_eq(dev_net(ifa->idev->dev), net))
3459 continue;
1d578303 3460 state->offset++;
9f0d3c27 3461 return ifa;
c2e21293 3462 }
1da177e4 3463 }
3c40090a 3464
c2e21293 3465 return NULL;
1da177e4
LT		 3466}
3467
1da177e4 3468static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3469 __acquires(rcu_bh)
1da177e4 3470{
5c578aed 3471 rcu_read_lock_bh();
1d578303 3472 return if6_get_first(seq, *pos);
1da177e4
LT		 3473}
3474
3475static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3476{
3477 struct inet6_ifaddr *ifa;
3478
3479 ifa = if6_get_next(seq, v);
3480 ++*pos;
3481 return ifa;
3482}
3483
3484static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3485 __releases(rcu_bh)
1da177e4 3486{
5c578aed 3487 rcu_read_unlock_bh();
1da177e4
LT		 3488}
3489
3490static int if6_seq_show(struct seq_file *seq, void *v)
3491{
3492 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 3493 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3494 &ifp->addr,
1da177e4
LT		 3495 ifp->idev->dev->ifindex,
3496 ifp->prefix_len,
3497 ifp->scope,
971a351c 3498 (u8) ifp->flags,
1da177e4
LT		 3499 ifp->idev->dev->name);
3500 return 0;
3501}
3502
56b3d975 3503static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3504 .start = if6_seq_start,
3505 .next = if6_seq_next,
3506 .show = if6_seq_show,
3507 .stop = if6_seq_stop,
3508};
3509
3510static int if6_seq_open(struct inode *inode, struct file *file)
3511{
3c40090a
DL		 3512 return seq_open_net(inode, file, &if6_seq_ops,
3513 sizeof(struct if6_iter_state));
1da177e4
LT		 3514}
3515
9a32144e 3516static const struct file_operations if6_fops = {
1da177e4
LT		 3517 .owner = THIS_MODULE,
3518 .open = if6_seq_open,
3519 .read = seq_read,
3520 .llseek = seq_lseek,
3c40090a 3521 .release = seq_release_net,
1da177e4
LT		 3522};
3523
2c8c1e72 3524static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3525{
d4beaa66 3526 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 3527 return -ENOMEM;
3528 return 0;
3529}
3530
2c8c1e72 3531static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 3532{
ece31ffd 3533 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 3534}
3535
3536static struct pernet_operations if6_proc_net_ops = {
3537 .init = if6_proc_net_init,
3538 .exit = if6_proc_net_exit,
3539};
3540
3541int __init if6_proc_init(void)
3542{
3543 return register_pernet_subsys(&if6_proc_net_ops);
3544}
3545
1da177e4
LT		 3546void if6_proc_exit(void)
3547{
3c40090a 3548 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3549}
3550#endif /* CONFIG_PROC_FS */
3551
07a93626 3552#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3553/* Check if address is a home address configured on any interface. */
b71d1d42 3554int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3555{
3556 int ret = 0;
c2e21293 3557 struct inet6_ifaddr *ifp = NULL;
ddbe5032 3558 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3559
5c578aed 3560 rcu_read_lock_bh();
b67bfe0d 3561 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 3562 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3563 continue;
caad295f 3564 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3565 (ifp->flags & IFA_F_HOMEADDRESS)) {
3566 ret = 1;
3567 break;
3568 }
3569 }
5c578aed 3570 rcu_read_unlock_bh();
3b9f9a1c
NT		 3571 return ret;
3572}
3573#endif
3574
1da177e4
LT		 3575/*
3576 * Periodic address status verification
3577 */
3578
c15b1cca 3579static void addrconf_verify_rtnl(void)
1da177e4 3580{
b2db7564 3581 unsigned long now, next, next_sec, next_sched;
1da177e4 3582 struct inet6_ifaddr *ifp;
1da177e4
LT		 3583 int i;
3584
c15b1cca
HFS		 3585 ASSERT_RTNL();
3586
5c578aed 3587 rcu_read_lock_bh();
1da177e4 3588 now = jiffies;
b2db7564 3589 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 3590
c15b1cca 3591 cancel_delayed_work(&addr_chk_work);
1da177e4 3592
bcdd553f 3593 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3594restart:
c15b1cca 3595 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 3596 unsigned long age;
1da177e4 3597
fad8da3e
YA		 3598 /* When setting preferred_lft to a value not zero or
3599 * infinity, while valid_lft is infinity
3600 * IFA_F_PERMANENT has a non-infinity life time.
3601 */
3602 if ((ifp->flags & IFA_F_PERMANENT) &&
3603 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 3604 continue;
3605
3606 spin_lock(&ifp->lock);
b2db7564
YH		 3607 /* We try to batch several events at once. */
3608 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3609
8f27ebb9
YH		 3610 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3611 age >= ifp->valid_lft) {
1da177e4
LT		 3612 spin_unlock(&ifp->lock);
3613 in6_ifa_hold(ifp);
1da177e4
LT		 3614 ipv6_del_addr(ifp);
3615 goto restart;
8f27ebb9
YH		 3616 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3617 spin_unlock(&ifp->lock);
3618 continue;
1da177e4 3619 } else if (age >= ifp->prefered_lft) {
a1ed0526 3620 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3621 int deprecate = 0;
3622
3623 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3624 deprecate = 1;
3625 ifp->flags |= IFA_F_DEPRECATED;
3626 }
3627
fad8da3e
YA		 3628 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3629 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 3630 next = ifp->tstamp + ifp->valid_lft * HZ;
3631
3632 spin_unlock(&ifp->lock);
3633
3634 if (deprecate) {
3635 in6_ifa_hold(ifp);
1da177e4
LT		 3636
3637 ipv6_ifa_notify(0, ifp);
3638 in6_ifa_put(ifp);
3639 goto restart;
3640 }
1da177e4
LT		 3641 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3642 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3643 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3644 ifp->idev->cnf.dad_transmits *
1f9248e5 3645 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 3646
1da177e4
LT		 3647 if (age >= ifp->prefered_lft - regen_advance) {
3648 struct inet6_ifaddr *ifpub = ifp->ifpub;
3649 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3650 next = ifp->tstamp + ifp->prefered_lft * HZ;
3651 if (!ifp->regen_count && ifpub) {
3652 ifp->regen_count++;
3653 in6_ifa_hold(ifp);
3654 in6_ifa_hold(ifpub);
3655 spin_unlock(&ifp->lock);
5c578aed 3656
291d809b
HY		 3657 spin_lock(&ifpub->lock);
3658 ifpub->regen_count = 0;
3659 spin_unlock(&ifpub->lock);
1da177e4
LT		 3660 ipv6_create_tempaddr(ifpub, ifp);
3661 in6_ifa_put(ifpub);
3662 in6_ifa_put(ifp);
3663 goto restart;
3664 }
3665 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3666 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3667 spin_unlock(&ifp->lock);
1da177e4
LT		 3668 } else {
3669 /* ifp->prefered_lft <= ifp->valid_lft */
3670 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3671 next = ifp->tstamp + ifp->prefered_lft * HZ;
3672 spin_unlock(&ifp->lock);
3673 }
3674 }
1da177e4
LT		 3675 }
3676
b2db7564
YH		 3677 next_sec = round_jiffies_up(next);
3678 next_sched = next;
3679
3680 /* If rounded timeout is accurate enough, accept it. */
3681 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3682 next_sched = next_sec;
3683
3684 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3685 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3686 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3687
ba3542e1 3688 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3689 now, next, next_sec, next_sched);
c15b1cca 3690 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 3691 rcu_read_unlock_bh();
1da177e4
LT		 3692}
3693
c15b1cca
HFS		 3694static void addrconf_verify_work(struct work_struct *w)
3695{
3696 rtnl_lock();
3697 addrconf_verify_rtnl();
3698 rtnl_unlock();
3699}
3700
3701static void addrconf_verify(void)
3702{
3703 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
3704}
3705
caeaba79
ND		 3706static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3707 struct in6_addr **peer_pfx)
461d8837
TG		 3708{
3709 struct in6_addr *pfx = NULL;
3710
caeaba79
ND		 3711 *peer_pfx = NULL;
3712
461d8837
TG		 3713 if (addr)
3714 pfx = nla_data(addr);
3715
3716 if (local) {
3717 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 3718 *peer_pfx = pfx;
3719 pfx = nla_data(local);
461d8837
TG		 3720 }
3721
3722 return pfx;
3723}
3724
ef7c79ed 3725static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3726 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3727 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3728 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 3729 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 3730};
3731
1da177e4 3732static int
661d2967 3733inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3734{
3b1e0a65 3735 struct net *net = sock_net(skb->sk);
b933f716
TG		 3736 struct ifaddrmsg *ifm;
3737 struct nlattr *tb[IFA_MAX+1];
caeaba79 3738 struct in6_addr *pfx, *peer_pfx;
6046d5b4 3739 u32 ifa_flags;
b933f716 3740 int err;
1da177e4 3741
b933f716
TG		 3742 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3743 if (err < 0)
3744 return err;
3745
3746 ifm = nlmsg_data(nlh);
caeaba79 3747 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3748 if (pfx == NULL)
3749 return -EINVAL;
3750
6046d5b4
HK		 3751 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3752
3753 /* We ignore other flags so far. */
3754 ifa_flags &= IFA_F_MANAGETEMPADDR;
3755
3756 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
3757 ifm->ifa_prefixlen);
1da177e4
LT		 3758}
3759
479840ff 3760static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 3761 u32 prefered_lft, u32 valid_lft)
081bba5b 3762{
6f704992
YH		 3763 u32 flags;
3764 clock_t expires;
4bed72e4 3765 unsigned long timeout;
53bd6749 3766 bool was_managetempaddr;
5b84efec 3767 bool had_prefixroute;
46d48046 3768
c15b1cca
HFS		 3769 ASSERT_RTNL();
3770
081bba5b
NT		 3771 if (!valid_lft || (prefered_lft > valid_lft))
3772 return -EINVAL;
3773
53bd6749
JP		 3774 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
3775 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
3776 return -EINVAL;
3777
4bed72e4
YH		 3778 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3779 if (addrconf_finite_timeout(timeout)) {
3780 expires = jiffies_to_clock_t(timeout * HZ);
3781 valid_lft = timeout;
6f704992 3782 flags = RTF_EXPIRES;
4bed72e4
YH		 3783 } else {
3784 expires = 0;
3785 flags = 0;
3786 ifa_flags |= IFA_F_PERMANENT;
6f704992 3787 }
081bba5b 3788
4bed72e4
YH		 3789 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3790 if (addrconf_finite_timeout(timeout)) {
3791 if (timeout == 0)
3792 ifa_flags |= IFA_F_DEPRECATED;
3793 prefered_lft = timeout;
3794 }
081bba5b
NT		 3795
3796 spin_lock_bh(&ifp->lock);
53bd6749 3797 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 3798 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
3799 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 3800 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 3801 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3802 IFA_F_NOPREFIXROUTE);
53bd6749 3803 ifp->flags |= ifa_flags;
081bba5b
NT		 3804 ifp->tstamp = jiffies;
3805 ifp->valid_lft = valid_lft;
3806 ifp->prefered_lft = prefered_lft;
3807
3808 spin_unlock_bh(&ifp->lock);
3809 if (!(ifp->flags&IFA_F_TENTATIVE))
3810 ipv6_ifa_notify(0, ifp);
081bba5b 3811
761aac73
TH		 3812 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
3813 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3814 expires, flags);
5b84efec
TH		 3815 } else if (had_prefixroute) {
3816 enum cleanup_prefix_rt_t action;
3817 unsigned long rt_expires;
3818
3819 write_lock_bh(&ifp->idev->lock);
3820 action = check_cleanup_prefix_route(ifp, &rt_expires);
3821 write_unlock_bh(&ifp->idev->lock);
3822
3823 if (action != CLEANUP_PREFIX_RT_NOP) {
3824 cleanup_prefix_route(ifp, rt_expires,
3825 action == CLEANUP_PREFIX_RT_DEL);
3826 }
761aac73 3827 }
53bd6749
JP		 3828
3829 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
3830 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
3831 valid_lft = prefered_lft = 0;
3832 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
3833 !was_managetempaddr, jiffies);
3834 }
3835
c15b1cca 3836 addrconf_verify_rtnl();
081bba5b
NT		 3837
3838 return 0;
3839}
3840
1da177e4 3841static int
661d2967 3842inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3843{
3b1e0a65 3844 struct net *net = sock_net(skb->sk);
461d8837
TG		 3845 struct ifaddrmsg *ifm;
3846 struct nlattr *tb[IFA_MAX+1];
caeaba79 3847 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 3848 struct inet6_ifaddr *ifa;
3849 struct net_device *dev;
55ebaef1 3850 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 3851 u32 ifa_flags;
461d8837 3852 int err;
1da177e4 3853
461d8837
TG		 3854 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3855 if (err < 0)
3856 return err;
3857
3858 ifm = nlmsg_data(nlh);
caeaba79 3859 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 3860 if (pfx == NULL)
3861 return -EINVAL;
3862
461d8837 3863 if (tb[IFA_CACHEINFO]) {
0778769d 3864 struct ifa_cacheinfo *ci;
461d8837
TG		 3865
3866 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3867 valid_lft = ci->ifa_valid;
461d8837
TG		 3868 preferred_lft = ci->ifa_prefered;
3869 } else {
3870 preferred_lft = INFINITY_LIFE_TIME;
3871 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3872 }
3873
af284937 3874 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3875 if (dev == NULL)
3876 return -ENODEV;
3877
479840ff
JP		 3878 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3879
55ebaef1 3880 /* We ignore other flags so far. */
761aac73
TH		 3881 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3882 IFA_F_NOPREFIXROUTE;
55ebaef1 3883
1cab3da6 3884 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3885 if (ifa == NULL) {
3886 /*
3887 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 3888 * userspace already relies on not having to provide this.
7198f8ce 3889 */
caeaba79 3890 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 3891 ifm->ifa_prefixlen, ifa_flags,
3892 preferred_lft, valid_lft);
081bba5b
NT		 3893 }
3894
7198f8ce
TG		 3895 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3896 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3897 err = -EEXIST;
3898 else
55ebaef1 3899 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3900
3901 in6_ifa_put(ifa);
3902
3903 return err;
1da177e4
LT		 3904}
3905
479840ff 3906static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 3907 u8 scope, int ifindex)
3908{
3909 struct ifaddrmsg *ifm;
3910
3911 ifm = nlmsg_data(nlh);
3912 ifm->ifa_family = AF_INET6;
3913 ifm->ifa_prefixlen = prefixlen;
3914 ifm->ifa_flags = flags;
3915 ifm->ifa_scope = scope;
3916 ifm->ifa_index = ifindex;
3917}
3918
85486af0
TG		 3919static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3920 unsigned long tstamp, u32 preferred, u32 valid)
3921{
3922 struct ifa_cacheinfo ci;
3923
18a31e1e
TG		 3924 ci.cstamp = cstamp_delta(cstamp);
3925 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 3926 ci.ifa_prefered = preferred;
3927 ci.ifa_valid = valid;
3928
3929 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3930}
3931
101bb229
TG		 3932static inline int rt_scope(int ifa_scope)
3933{
3934 if (ifa_scope & IFA_HOST)
3935 return RT_SCOPE_HOST;
3936 else if (ifa_scope & IFA_LINK)
3937 return RT_SCOPE_LINK;
3938 else if (ifa_scope & IFA_SITE)
3939 return RT_SCOPE_SITE;
3940 else
3941 return RT_SCOPE_UNIVERSE;
3942}
3943
0ab6803b
TG		 3944static inline int inet6_ifaddr_msgsize(void)
3945{
339bf98f 3946 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 3947 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 3948 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 3949 + nla_total_size(sizeof(struct ifa_cacheinfo))
3950 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 3951}
c5396a31 3952
1da177e4 3953static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 3954 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3955{
1da177e4 3956 struct nlmsghdr *nlh;
85486af0 3957 u32 preferred, valid;
1da177e4 3958
15e47304 3959 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3960 if (nlh == NULL)
26932566 3961 return -EMSGSIZE;
0ab6803b 3962
101bb229
TG		 3963 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3964 ifa->idev->dev->ifindex);
3965
fad8da3e
YA		 3966 if (!((ifa->flags&IFA_F_PERMANENT) &&
3967 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 3968 preferred = ifa->prefered_lft;
3969 valid = ifa->valid_lft;
3970 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3971 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3972 if (preferred > tval)
3973 preferred -= tval;
3974 else
3975 preferred = 0;
f56619fc
BH		 3976 if (valid != INFINITY_LIFE_TIME) {
3977 if (valid > tval)
3978 valid -= tval;
3979 else
3980 valid = 0;
3981 }
1da177e4
LT		 3982 }
3983 } else {
85486af0
TG		 3984 preferred = INFINITY_LIFE_TIME;
3985 valid = INFINITY_LIFE_TIME;
3986 }
3987
7996c799 3988 if (!ipv6_addr_any(&ifa->peer_addr)) {
caeaba79
ND		 3989 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3990 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3991 goto error;
3992 } else
3993 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3994 goto error;
3995
3996 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3997 goto error;
1da177e4 3998
479840ff
JP		 3999 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4000 goto error;
4001
0ab6803b 4002 return nlmsg_end(skb, nlh);
caeaba79
ND		 4003
4004error:
4005 nlmsg_cancel(skb, nlh);
4006 return -EMSGSIZE;
1da177e4
LT		 4007}
4008
4009static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4010 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4011{
1da177e4 4012 struct nlmsghdr *nlh;
101bb229
TG		 4013 u8 scope = RT_SCOPE_UNIVERSE;
4014 int ifindex = ifmca->idev->dev->ifindex;
4015
4016 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4017 scope = RT_SCOPE_SITE;
1da177e4 4018
15e47304 4019 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 4020 if (nlh == NULL)
26932566 4021 return -EMSGSIZE;
85486af0 4022
0ab6803b
TG		 4023 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4024 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
4025 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4026 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4027 nlmsg_cancel(skb, nlh);
4028 return -EMSGSIZE;
4029 }
85486af0 4030
0ab6803b 4031 return nlmsg_end(skb, nlh);
1da177e4
LT		 4032}
4033
4034static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4035 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4036{
1da177e4 4037 struct nlmsghdr *nlh;
101bb229
TG		 4038 u8 scope = RT_SCOPE_UNIVERSE;
4039 int ifindex = ifaca->aca_idev->dev->ifindex;
4040
4041 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4042 scope = RT_SCOPE_SITE;
1da177e4 4043
15e47304 4044 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 4045 if (nlh == NULL)
26932566 4046 return -EMSGSIZE;
85486af0 4047
0ab6803b
TG		 4048 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4049 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
4050 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4051 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4052 nlmsg_cancel(skb, nlh);
4053 return -EMSGSIZE;
4054 }
1da177e4 4055
0ab6803b 4056 return nlmsg_end(skb, nlh);
1da177e4
LT		 4057}
4058
e21e8467 4059enum addr_type_t {
1da177e4
LT		 4060 UNICAST_ADDR,
4061 MULTICAST_ADDR,
4062 ANYCAST_ADDR,
4063};
4064
234b27c3
ED		 4065/* called with rcu_read_lock() */
4066static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4067 struct netlink_callback *cb, enum addr_type_t type,
4068 int s_ip_idx, int *p_ip_idx)
4069{
234b27c3
ED		 4070 struct ifmcaddr6 *ifmca;
4071 struct ifacaddr6 *ifaca;
4072 int err = 1;
4073 int ip_idx = *p_ip_idx;
4074
4075 read_lock_bh(&idev->lock);
4076 switch (type) {
502a2ffd 4077 case UNICAST_ADDR: {
4078 struct inet6_ifaddr *ifa;
4079
234b27c3 4080 /* unicast address incl. temp addr */
502a2ffd 4081 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4082 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4083 continue;
4084 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4085 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4086 cb->nlh->nlmsg_seq,
4087 RTM_NEWADDR,
4088 NLM_F_MULTI);
4089 if (err <= 0)
4090 break;
63998ac2 4091 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4092 }
4093 break;
502a2ffd 4094 }
234b27c3
ED		 4095 case MULTICAST_ADDR:
4096 /* multicast address */
4097 for (ifmca = idev->mc_list; ifmca;
4098 ifmca = ifmca->next, ip_idx++) {
4099 if (ip_idx < s_ip_idx)
4100 continue;
4101 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4102 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4103 cb->nlh->nlmsg_seq,
4104 RTM_GETMULTICAST,
4105 NLM_F_MULTI);
4106 if (err <= 0)
4107 break;
4108 }
4109 break;
4110 case ANYCAST_ADDR:
4111 /* anycast address */
4112 for (ifaca = idev->ac_list; ifaca;
4113 ifaca = ifaca->aca_next, ip_idx++) {
4114 if (ip_idx < s_ip_idx)
4115 continue;
4116 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4117 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4118 cb->nlh->nlmsg_seq,
4119 RTM_GETANYCAST,
4120 NLM_F_MULTI);
4121 if (err <= 0)
4122 break;
4123 }
4124 break;
4125 default:
4126 break;
4127 }
4128 read_unlock_bh(&idev->lock);
4129 *p_ip_idx = ip_idx;
4130 return err;
4131}
4132
1da177e4
LT		 4133static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4134 enum addr_type_t type)
4135{
234b27c3
ED		 4136 struct net *net = sock_net(skb->sk);
4137 int h, s_h;
1da177e4
LT		 4138 int idx, ip_idx;
4139 int s_idx, s_ip_idx;
1da177e4 4140 struct net_device *dev;
234b27c3
ED		 4141 struct inet6_dev *idev;
4142 struct hlist_head *head;
1ab1457c 4143
234b27c3
ED		 4144 s_h = cb->args[0];
4145 s_idx = idx = cb->args[1];
4146 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4147
234b27c3 4148 rcu_read_lock();
63998ac2 4149 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4150 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4151 idx = 0;
4152 head = &net->dev_index_head[h];
b67bfe0d 4153 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4154 if (idx < s_idx)
4155 goto cont;
4b97efdf 4156 if (h > s_h || idx > s_idx)
234b27c3
ED		 4157 s_ip_idx = 0;
4158 ip_idx = 0;
e21e8467
SH		 4159 idev = __in6_dev_get(dev);
4160 if (!idev)
234b27c3
ED		 4161 goto cont;
4162
4163 if (in6_dump_addrs(idev, skb, cb, type,
4164 s_ip_idx, &ip_idx) <= 0)
4165 goto done;
7562f876 4166cont:
234b27c3
ED		 4167 idx++;
4168 }
1da177e4 4169 }
234b27c3
ED		 4170done:
4171 rcu_read_unlock();
4172 cb->args[0] = h;
4173 cb->args[1] = idx;
4174 cb->args[2] = ip_idx;
4175
1da177e4
LT		 4176 return skb->len;
4177}
4178
4179static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4180{
4181 enum addr_type_t type = UNICAST_ADDR;
b854272b 4182
1da177e4
LT		 4183 return inet6_dump_addr(skb, cb, type);
4184}
4185
4186static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4187{
4188 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4189
1da177e4
LT		 4190 return inet6_dump_addr(skb, cb, type);
4191}
4192
4193
4194static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4195{
4196 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4197
1da177e4
LT		 4198 return inet6_dump_addr(skb, cb, type);
4199}
4200
661d2967 4201static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4202{
3b1e0a65 4203 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4204 struct ifaddrmsg *ifm;
4205 struct nlattr *tb[IFA_MAX+1];
caeaba79 4206 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4207 struct net_device *dev = NULL;
4208 struct inet6_ifaddr *ifa;
4209 struct sk_buff *skb;
6c223828
NT		 4210 int err;
4211
1b29fc2c
TG		 4212 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4213 if (err < 0)
4214 goto errout;
4215
caeaba79 4216 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
1b29fc2c
TG		 4217 if (addr == NULL) {
4218 err = -EINVAL;
4219 goto errout;
6c223828 4220 }
6c223828 4221
1b29fc2c 4222 ifm = nlmsg_data(nlh);
6c223828 4223 if (ifm->ifa_index)
6fda7350 4224 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4225
e21e8467
SH		 4226 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4227 if (!ifa) {
1b29fc2c
TG		 4228 err = -EADDRNOTAVAIL;
4229 goto errout;
4230 }
6c223828 4231
e21e8467
SH		 4232 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4233 if (!skb) {
6c223828 4234 err = -ENOBUFS;
1b29fc2c 4235 goto errout_ifa;
6c223828
NT		 4236 }
4237
15e47304 4238 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4239 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4240 if (err < 0) {
4241 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4242 WARN_ON(err == -EMSGSIZE);
4243 kfree_skb(skb);
4244 goto errout_ifa;
4245 }
15e47304 4246 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4247errout_ifa:
6c223828 4248 in6_ifa_put(ifa);
1b29fc2c 4249errout:
6c223828 4250 return err;
6c223828
NT		 4251}
4252
1da177e4
LT		 4253static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4254{
4255 struct sk_buff *skb;
c346dca1 4256 struct net *net = dev_net(ifa->idev->dev);
5d620266 4257 int err = -ENOBUFS;
1da177e4 4258
0ab6803b 4259 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 4260 if (skb == NULL)
4261 goto errout;
4262
4263 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4264 if (err < 0) {
4265 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4266 WARN_ON(err == -EMSGSIZE);
4267 kfree_skb(skb);
4268 goto errout;
4269 }
1ce85fe4
PNA		 4270 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4271 return;
5d620266
TG		 4272errout:
4273 if (err < 0)
6fda7350 4274 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4275}
4276
b6f99a21 4277static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4278 __s32 *array, int bytes)
4279{
04561c1f
TG		 4280 BUG_ON(bytes < (DEVCONF_MAX * 4));
4281
1da177e4
LT		 4282 memset(array, 0, bytes);
4283 array[DEVCONF_FORWARDING] = cnf->forwarding;
4284 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4285 array[DEVCONF_MTU6] = cnf->mtu6;
4286 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4287 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4288 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4289 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4290 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4291 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4292 jiffies_to_msecs(cnf->rtr_solicit_interval);
4293 array[DEVCONF_RTR_SOLICIT_DELAY] =
4294 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4295 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4296 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4297 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4298 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4299 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4300 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4301 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4302 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4303 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4304 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4305 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4306 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 4307 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4308#ifdef CONFIG_IPV6_ROUTER_PREF
4309 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4310 array[DEVCONF_RTR_PROBE_INTERVAL] =
4311 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4312#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4313 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4314#endif
930d6ff2 4315#endif
fbea49e1 4316 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4317 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4318#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4319 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4320#endif
7bc570c8
YH		 4321#ifdef CONFIG_IPV6_MROUTE
4322 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4323#endif
778d80be 4324 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4325 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4326 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4327 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 4328 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 4329 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
1da177e4
LT		 4330}
4331
b382b191
TG		 4332static inline size_t inet6_ifla6_size(void)
4333{
4334 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4335 + nla_total_size(sizeof(struct ifla_cacheinfo))
4336 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4337 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4338 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4339 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4340}
4341
339bf98f
TG		 4342static inline size_t inet6_if_nlmsg_size(void)
4343{
4344 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4345 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4346 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4347 + nla_total_size(4) /* IFLA_MTU */
4348 + nla_total_size(4) /* IFLA_LINK */
b382b191 4349 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4350}
c5396a31 4351
be281e55 4352static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4353 int items, int bytes)
7f7d9a6b
HX		 4354{
4355 int i;
4356 int pad = bytes - sizeof(u64) * items;
4357 BUG_ON(pad < 0);
4358
4359 /* Use put_unaligned() because stats may not be aligned for u64. */
4360 put_unaligned(items, &stats[0]);
4361 for (i = 1; i < items; i++)
be281e55 4362 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4363
4364 memset(&stats[items], 0, pad);
4365}
4366
698365fa 4367static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4ce3c183
ED		 4368 int items, int bytes, size_t syncpoff)
4369{
4370 int i;
4371 int pad = bytes - sizeof(u64) * items;
4372 BUG_ON(pad < 0);
4373
4374 /* Use put_unaligned() because stats may not be aligned for u64. */
4375 put_unaligned(items, &stats[0]);
4376 for (i = 1; i < items; i++)
4377 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4378
4379 memset(&stats[items], 0, pad);
4380}
4381
7f7d9a6b
HX		 4382static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4383 int bytes)
4384{
e21e8467 4385 switch (attrtype) {
7f7d9a6b 4386 case IFLA_INET6_STATS:
698365fa 4387 __snmp6_fill_stats64(stats, idev->stats.ipv6,
4ce3c183 4388 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4389 break;
4390 case IFLA_INET6_ICMP6STATS:
be281e55 4391 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4392 break;
4393 }
4394}
4395
b382b191
TG		 4396static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4397{
4398 struct nlattr *nla;
4399 struct ifla_cacheinfo ci;
4400
c78679e8
DM		 4401 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4402 goto nla_put_failure;
b382b191 4403 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4404 ci.tstamp = cstamp_delta(idev->tstamp);
4405 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 4406 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 4407 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4408 goto nla_put_failure;
b382b191
TG		 4409 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4410 if (nla == NULL)
4411 goto nla_put_failure;
4412 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4413
4414 /* XXX - MC not implemented */
4415
4416 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4417 if (nla == NULL)
4418 goto nla_put_failure;
4419 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4420
4421 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4422 if (nla == NULL)
4423 goto nla_put_failure;
4424 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4425
f53adae4
DB		 4426 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4427 if (nla == NULL)
4428 goto nla_put_failure;
bc91b0f0
JP		 4429
4430 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4431 goto nla_put_failure;
4432
f53adae4
DB		 4433 read_lock_bh(&idev->lock);
4434 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4435 read_unlock_bh(&idev->lock);
4436
b382b191
TG		 4437 return 0;
4438
4439nla_put_failure:
4440 return -EMSGSIZE;
4441}
4442
4443static size_t inet6_get_link_af_size(const struct net_device *dev)
4444{
4445 if (!__in6_dev_get(dev))
4446 return 0;
4447
4448 return inet6_ifla6_size();
4449}
4450
4451static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4452{
4453 struct inet6_dev *idev = __in6_dev_get(dev);
4454
4455 if (!idev)
4456 return -ENODATA;
4457
4458 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4459 return -EMSGSIZE;
4460
4461 return 0;
4462}
4463
f53adae4
DB		 4464static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4465{
f53adae4
DB		 4466 struct inet6_ifaddr *ifp;
4467 struct net_device *dev = idev->dev;
fc403832 4468 bool update_rs = false;
dc848292 4469 struct in6_addr ll_addr;
f53adae4 4470
c15b1cca
HFS		 4471 ASSERT_RTNL();
4472
f53adae4
DB		 4473 if (token == NULL)
4474 return -EINVAL;
4475 if (ipv6_addr_any(token))
4476 return -EINVAL;
4477 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4478 return -EINVAL;
f53adae4
DB		 4479 if (!ipv6_accept_ra(idev))
4480 return -EINVAL;
4481 if (idev->cnf.rtr_solicits <= 0)
4482 return -EINVAL;
4483
4484 write_lock_bh(&idev->lock);
4485
4486 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4487 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4488
4489 write_unlock_bh(&idev->lock);
4490
dc848292
HFS		 4491 if (!idev->dead && (idev->if_flags & IF_READY) &&
4492 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4493 IFA_F_OPTIMISTIC)) {
fc403832
DB		 4494
4495 /* If we're not ready, then normal ifup will take care
4496 * of this. Otherwise, we need to request our rs here.
4497 */
4498 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4499 update_rs = true;
4500 }
f53adae4
DB		 4501
4502 write_lock_bh(&idev->lock);
fc403832 4503
77ecaace 4504 if (update_rs) {
fc403832 4505 idev->if_flags |= IF_RS_SENT;
77ecaace
HFS		 4506 idev->rs_probes = 1;
4507 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4508 }
f53adae4
DB		 4509
4510 /* Well, that's kinda nasty ... */
4511 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4512 spin_lock(&ifp->lock);
617fe29d 4513 if (ifp->tokenized) {
f53adae4
DB		 4514 ifp->valid_lft = 0;
4515 ifp->prefered_lft = 0;
4516 }
4517 spin_unlock(&ifp->lock);
4518 }
4519
4520 write_unlock_bh(&idev->lock);
c15b1cca 4521 addrconf_verify_rtnl();
f53adae4
DB		 4522 return 0;
4523}
4524
4525static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4526{
4527 int err = -EINVAL;
4528 struct inet6_dev *idev = __in6_dev_get(dev);
4529 struct nlattr *tb[IFLA_INET6_MAX + 1];
4530
4531 if (!idev)
4532 return -EAFNOSUPPORT;
4533
4534 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4535 BUG();
4536
bc91b0f0 4537 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 4538 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 4539 if (err)
4540 return err;
4541 }
4542
4543 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4544 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4545
4546 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
4547 mode != IN6_ADDR_GEN_MODE_NONE)
4548 return -EINVAL;
4549 idev->addr_gen_mode = mode;
4550 err = 0;
4551 }
f53adae4
DB		 4552
4553 return err;
4554}
4555
1ab1457c 4556static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4557 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4558{
04561c1f 4559 struct net_device *dev = idev->dev;
04561c1f
TG		 4560 struct ifinfomsg *hdr;
4561 struct nlmsghdr *nlh;
4562 void *protoinfo;
04561c1f 4563
15e47304 4564 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
04561c1f 4565 if (nlh == NULL)
26932566 4566 return -EMSGSIZE;
04561c1f
TG		 4567
4568 hdr = nlmsg_data(nlh);
4569 hdr->ifi_family = AF_INET6;
4570 hdr->__ifi_pad = 0;
4571 hdr->ifi_type = dev->type;
4572 hdr->ifi_index = dev->ifindex;
4573 hdr->ifi_flags = dev_get_flags(dev);
4574 hdr->ifi_change = 0;
4575
c78679e8
DM		 4576 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4577 (dev->addr_len &&
4578 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4579 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4580 (dev->ifindex != dev->iflink &&
4581 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4582 goto nla_put_failure;
04561c1f
TG		 4583 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4584 if (protoinfo == NULL)
4585 goto nla_put_failure;
1da177e4 4586
b382b191 4587 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4588 goto nla_put_failure;
1da177e4 4589
04561c1f
TG		 4590 nla_nest_end(skb, protoinfo);
4591 return nlmsg_end(skb, nlh);
1da177e4 4592
04561c1f 4593nla_put_failure:
26932566
PM		 4594 nlmsg_cancel(skb, nlh);
4595 return -EMSGSIZE;
1da177e4
LT		 4596}
4597
4598static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4599{
3b1e0a65 4600 struct net *net = sock_net(skb->sk);
84d2697d 4601 int h, s_h;
434a8a58 4602 int idx = 0, s_idx;
1da177e4
LT		 4603 struct net_device *dev;
4604 struct inet6_dev *idev;
84d2697d 4605 struct hlist_head *head;
1da177e4 4606
84d2697d
ED		 4607 s_h = cb->args[0];
4608 s_idx = cb->args[1];
4609
4610 rcu_read_lock();
4611 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4612 idx = 0;
4613 head = &net->dev_index_head[h];
b67bfe0d 4614 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 4615 if (idx < s_idx)
4616 goto cont;
4617 idev = __in6_dev_get(dev);
4618 if (!idev)
4619 goto cont;
4620 if (inet6_fill_ifinfo(skb, idev,
15e47304 4621 NETLINK_CB(cb->skb).portid,
84d2697d
ED		 4622 cb->nlh->nlmsg_seq,
4623 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4624 goto out;
7562f876 4625cont:
84d2697d
ED		 4626 idx++;
4627 }
1da177e4 4628 }
84d2697d
ED		 4629out:
4630 rcu_read_unlock();
4631 cb->args[1] = idx;
4632 cb->args[0] = h;
1da177e4
LT		 4633
4634 return skb->len;
4635}
4636
4637void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4638{
4639 struct sk_buff *skb;
c346dca1 4640 struct net *net = dev_net(idev->dev);
8d7a76c9 4641 int err = -ENOBUFS;
1ab1457c 4642
339bf98f 4643 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4644 if (skb == NULL)
4645 goto errout;
4646
4647 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4648 if (err < 0) {
4649 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4650 WARN_ON(err == -EMSGSIZE);
4651 kfree_skb(skb);
4652 goto errout;
4653 }
5f75a104 4654 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4655 return;
8d7a76c9
TG		 4656errout:
4657 if (err < 0)
5f75a104 4658 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4659}
4660
339bf98f
TG		 4661static inline size_t inet6_prefix_nlmsg_size(void)
4662{
4663 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4664 + nla_total_size(sizeof(struct in6_addr))
4665 + nla_total_size(sizeof(struct prefix_cacheinfo));
4666}
c5396a31 4667
1da177e4 4668static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4669 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 4670 int event, unsigned int flags)
1da177e4 4671{
6051e2f4
TG		 4672 struct prefixmsg *pmsg;
4673 struct nlmsghdr *nlh;
1da177e4
LT		 4674 struct prefix_cacheinfo ci;
4675
15e47304 4676 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6051e2f4 4677 if (nlh == NULL)
26932566 4678 return -EMSGSIZE;
6051e2f4
TG		 4679
4680 pmsg = nlmsg_data(nlh);
1da177e4 4681 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4682 pmsg->prefix_pad1 = 0;
4683 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4684 pmsg->prefix_ifindex = idev->dev->ifindex;
4685 pmsg->prefix_len = pinfo->prefix_len;
4686 pmsg->prefix_type = pinfo->type;
8a47077a 4687 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4688 pmsg->prefix_flags = 0;
4689 if (pinfo->onlink)
4690 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4691 if (pinfo->autoconf)
4692 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4693
c78679e8
DM		 4694 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4695 goto nla_put_failure;
1da177e4
LT		 4696 ci.preferred_time = ntohl(pinfo->prefered);
4697 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 4698 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4699 goto nla_put_failure;
6051e2f4 4700 return nlmsg_end(skb, nlh);
1da177e4 4701
6051e2f4 4702nla_put_failure:
26932566
PM		 4703 nlmsg_cancel(skb, nlh);
4704 return -EMSGSIZE;
1da177e4
LT		 4705}
4706
1ab1457c 4707static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4708 struct prefix_info *pinfo)
4709{
4710 struct sk_buff *skb;
c346dca1 4711 struct net *net = dev_net(idev->dev);
8c384bfa 4712 int err = -ENOBUFS;
1da177e4 4713
339bf98f 4714 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4715 if (skb == NULL)
4716 goto errout;
4717
4718 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4719 if (err < 0) {
4720 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4721 WARN_ON(err == -EMSGSIZE);
4722 kfree_skb(skb);
4723 goto errout;
4724 }
1ce85fe4
PNA		 4725 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4726 return;
8c384bfa
TG		 4727errout:
4728 if (err < 0)
6fda7350 4729 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4730}
4731
1da177e4
LT		 4732static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4733{
63998ac2
ND		 4734 struct net *net = dev_net(ifp->idev->dev);
4735
c15b1cca
HFS		 4736 if (event)
4737 ASSERT_RTNL();
4738
1da177e4
LT		 4739 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4740
4741 switch (event) {
4742 case RTM_NEWADDR:
95c385b4
NH		 4743 /*
4744 * If the address was optimistic
4745 * we inserted the route at the start of
4746 * our DAD process, so we don't need
4747 * to do it again
4748 */
4749 if (!(ifp->rt->rt6i_node))
4750 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4751 if (ifp->idev->cnf.forwarding)
4752 addrconf_join_anycast(ifp);
7996c799 4753 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 4754 addrconf_prefix_route(&ifp->peer_addr, 128,
4755 ifp->idev->dev, 0, 0);
1da177e4
LT		 4756 break;
4757 case RTM_DELADDR:
4758 if (ifp->idev->cnf.forwarding)
4759 addrconf_leave_anycast(ifp);
4760 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 4761 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79
ND		 4762 struct rt6_info *rt;
4763 struct net_device *dev = ifp->idev->dev;
4764
4765 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4766 dev->ifindex, 1);
4767 if (rt) {
4768 dst_hold(&rt->dst);
4769 if (ip6_del_rt(rt))
4770 dst_free(&rt->dst);
4771 }
4772 }
d8d1f30b 4773 dst_hold(&ifp->rt->dst);
93fa159a 4774
73a8bd74 4775 if (ip6_del_rt(ifp->rt))
d8d1f30b 4776 dst_free(&ifp->rt->dst);
1da177e4
LT		 4777 break;
4778 }
63998ac2 4779 atomic_inc(&net->ipv6.dev_addr_genid);
439677d7 4780 rt_genid_bump_ipv6(net);
1da177e4
LT		 4781}
4782
4783static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4784{
8814c4b5 4785 rcu_read_lock_bh();
1da177e4
LT		 4786 if (likely(ifp->idev->dead == 0))
4787 __ipv6_ifa_notify(event, ifp);
8814c4b5 4788 rcu_read_unlock_bh();
1da177e4
LT		 4789}
4790
4791#ifdef CONFIG_SYSCTL
4792
4793static
fe2c6338 4794int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 4795 void __user *buffer, size_t *lenp, loff_t *ppos)
4796{
4797 int *valp = ctl->data;
4798 int val = *valp;
88af182e 4799 loff_t pos = *ppos;
fe2c6338 4800 struct ctl_table lctl;
1da177e4
LT		 4801 int ret;
4802
013d97e9
FR		 4803 /*
4804 * ctl->data points to idev->cnf.forwarding, we should
4805 * not modify it until we get the rtnl lock.
4806 */
4807 lctl = *ctl;
4808 lctl.data = &val;
4809
4810 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 4811
c8fecf22 4812 if (write)
b325fddb 4813 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4814 if (ret)
4815 *ppos = pos;
1ab1457c 4816 return ret;
1da177e4
LT		 4817}
4818
56d417b1
BH		 4819static void dev_disable_change(struct inet6_dev *idev)
4820{
75538c2b
CW		 4821 struct netdev_notifier_info info;
4822
56d417b1
BH		 4823 if (!idev || !idev->dev)
4824 return;
4825
75538c2b 4826 netdev_notifier_info_init(&info, idev->dev);
56d417b1 4827 if (idev->cnf.disable_ipv6)
75538c2b 4828 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 4829 else
75538c2b 4830 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 4831}
4832
4833static void addrconf_disable_change(struct net *net, __s32 newf)
4834{
4835 struct net_device *dev;
4836 struct inet6_dev *idev;
4837
c6d14c84
ED		 4838 rcu_read_lock();
4839 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4840 idev = __in6_dev_get(dev);
4841 if (idev) {
4842 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4843 idev->cnf.disable_ipv6 = newf;
4844 if (changed)
4845 dev_disable_change(idev);
4846 }
56d417b1 4847 }
c6d14c84 4848 rcu_read_unlock();
56d417b1
BH		 4849}
4850
013d97e9 4851static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 4852{
4853 struct net *net;
013d97e9
FR		 4854 int old;
4855
4856 if (!rtnl_trylock())
4857 return restart_syscall();
56d417b1
BH		 4858
4859 net = (struct net *)table->extra2;
013d97e9
FR		 4860 old = *p;
4861 *p = newf;
56d417b1 4862
013d97e9
FR		 4863 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4864 rtnl_unlock();
56d417b1 4865 return 0;
88af182e 4866 }
56d417b1
BH		 4867
4868 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 4869 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4870 addrconf_disable_change(net, newf);
013d97e9 4871 } else if ((!newf) ^ (!old))
56d417b1
BH		 4872 dev_disable_change((struct inet6_dev *)table->extra1);
4873
4874 rtnl_unlock();
4875 return 0;
4876}
4877
4878static
fe2c6338 4879int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 4880 void __user *buffer, size_t *lenp, loff_t *ppos)
4881{
4882 int *valp = ctl->data;
4883 int val = *valp;
88af182e 4884 loff_t pos = *ppos;
fe2c6338 4885 struct ctl_table lctl;
56d417b1
BH		 4886 int ret;
4887
013d97e9
FR		 4888 /*
4889 * ctl->data points to idev->cnf.disable_ipv6, we should
4890 * not modify it until we get the rtnl lock.
4891 */
4892 lctl = *ctl;
4893 lctl.data = &val;
4894
4895 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 4896
4897 if (write)
4898 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4899 if (ret)
4900 *ppos = pos;
56d417b1
BH		 4901 return ret;
4902}
4903
c92d5491 4904static
4905int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
4906 void __user *buffer, size_t *lenp, loff_t *ppos)
4907{
4908 int *valp = ctl->data;
4909 int ret;
4910 int old, new;
4911
4912 old = *valp;
4913 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4914 new = *valp;
4915
4916 if (write && old != new) {
4917 struct net *net = ctl->extra2;
4918
4919 if (!rtnl_trylock())
4920 return restart_syscall();
4921
4922 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
4923 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4924 NETCONFA_IFINDEX_DEFAULT,
4925 net->ipv6.devconf_dflt);
4926 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
4927 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4928 NETCONFA_IFINDEX_ALL,
4929 net->ipv6.devconf_all);
4930 else {
4931 struct inet6_dev *idev = ctl->extra1;
4932
4933 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4934 idev->dev->ifindex,
4935 &idev->cnf);
4936 }
4937 rtnl_unlock();
4938 }
4939
4940 return ret;
4941}
4942
4943
1da177e4
LT		 4944static struct addrconf_sysctl_table
4945{
4946 struct ctl_table_header *sysctl_header;
fe2c6338 4947 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 4948} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4949 .sysctl_header = NULL,
4950 .addrconf_vars = {
1ab1457c 4951 {
e21e8467
SH		 4952 .procname = "forwarding",
4953 .data = &ipv6_devconf.forwarding,
4954 .maxlen = sizeof(int),
4955 .mode = 0644,
4956 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4957 },
4958 {
e21e8467
SH		 4959 .procname = "hop_limit",
4960 .data = &ipv6_devconf.hop_limit,
4961 .maxlen = sizeof(int),
4962 .mode = 0644,
4963 .proc_handler = proc_dointvec,
1da177e4
LT		 4964 },
4965 {
e21e8467
SH		 4966 .procname = "mtu",
4967 .data = &ipv6_devconf.mtu6,
4968 .maxlen = sizeof(int),
4969 .mode = 0644,
4970 .proc_handler = proc_dointvec,
1da177e4
LT		 4971 },
4972 {
e21e8467
SH		 4973 .procname = "accept_ra",
4974 .data = &ipv6_devconf.accept_ra,
4975 .maxlen = sizeof(int),
4976 .mode = 0644,
4977 .proc_handler = proc_dointvec,
1da177e4
LT		 4978 },
4979 {
e21e8467
SH		 4980 .procname = "accept_redirects",
4981 .data = &ipv6_devconf.accept_redirects,
4982 .maxlen = sizeof(int),
4983 .mode = 0644,
4984 .proc_handler = proc_dointvec,
1da177e4
LT		 4985 },
4986 {
e21e8467
SH		 4987 .procname = "autoconf",
4988 .data = &ipv6_devconf.autoconf,
4989 .maxlen = sizeof(int),
4990 .mode = 0644,
4991 .proc_handler = proc_dointvec,
1da177e4
LT		 4992 },
4993 {
e21e8467
SH		 4994 .procname = "dad_transmits",
4995 .data = &ipv6_devconf.dad_transmits,
4996 .maxlen = sizeof(int),
4997 .mode = 0644,
4998 .proc_handler = proc_dointvec,
1da177e4
LT		 4999 },
5000 {
e21e8467
SH		 5001 .procname = "router_solicitations",
5002 .data = &ipv6_devconf.rtr_solicits,
5003 .maxlen = sizeof(int),
5004 .mode = 0644,
5005 .proc_handler = proc_dointvec,
1da177e4
LT		 5006 },
5007 {
e21e8467
SH		 5008 .procname = "router_solicitation_interval",
5009 .data = &ipv6_devconf.rtr_solicit_interval,
5010 .maxlen = sizeof(int),
5011 .mode = 0644,
5012 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5013 },
5014 {
e21e8467
SH		 5015 .procname = "router_solicitation_delay",
5016 .data = &ipv6_devconf.rtr_solicit_delay,
5017 .maxlen = sizeof(int),
5018 .mode = 0644,
5019 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5020 },
5021 {
e21e8467
SH		 5022 .procname = "force_mld_version",
5023 .data = &ipv6_devconf.force_mld_version,
5024 .maxlen = sizeof(int),
5025 .mode = 0644,
5026 .proc_handler = proc_dointvec,
1da177e4 5027 },
fc4eba58
HFS		 5028 {
5029 .procname = "mldv1_unsolicited_report_interval",
5030 .data =
5031 &ipv6_devconf.mldv1_unsolicited_report_interval,
5032 .maxlen = sizeof(int),
5033 .mode = 0644,
5034 .proc_handler = proc_dointvec_ms_jiffies,
5035 },
5036 {
5037 .procname = "mldv2_unsolicited_report_interval",
5038 .data =
5039 &ipv6_devconf.mldv2_unsolicited_report_interval,
5040 .maxlen = sizeof(int),
5041 .mode = 0644,
5042 .proc_handler = proc_dointvec_ms_jiffies,
5043 },
1da177e4 5044 {
e21e8467
SH		 5045 .procname = "use_tempaddr",
5046 .data = &ipv6_devconf.use_tempaddr,
5047 .maxlen = sizeof(int),
5048 .mode = 0644,
5049 .proc_handler = proc_dointvec,
1da177e4
LT		 5050 },
5051 {
e21e8467
SH		 5052 .procname = "temp_valid_lft",
5053 .data = &ipv6_devconf.temp_valid_lft,
5054 .maxlen = sizeof(int),
5055 .mode = 0644,
5056 .proc_handler = proc_dointvec,
1da177e4
LT		 5057 },
5058 {
e21e8467
SH		 5059 .procname = "temp_prefered_lft",
5060 .data = &ipv6_devconf.temp_prefered_lft,
5061 .maxlen = sizeof(int),
5062 .mode = 0644,
5063 .proc_handler = proc_dointvec,
1da177e4
LT		 5064 },
5065 {
e21e8467
SH		 5066 .procname = "regen_max_retry",
5067 .data = &ipv6_devconf.regen_max_retry,
5068 .maxlen = sizeof(int),
5069 .mode = 0644,
5070 .proc_handler = proc_dointvec,
1da177e4
LT		 5071 },
5072 {
e21e8467
SH		 5073 .procname = "max_desync_factor",
5074 .data = &ipv6_devconf.max_desync_factor,
5075 .maxlen = sizeof(int),
5076 .mode = 0644,
5077 .proc_handler = proc_dointvec,
1da177e4 5078 },
1da177e4 5079 {
e21e8467
SH		 5080 .procname = "max_addresses",
5081 .data = &ipv6_devconf.max_addresses,
5082 .maxlen = sizeof(int),
5083 .mode = 0644,
5084 .proc_handler = proc_dointvec,
1da177e4 5085 },
65f5c7c1 5086 {
e21e8467
SH		 5087 .procname = "accept_ra_defrtr",
5088 .data = &ipv6_devconf.accept_ra_defrtr,
5089 .maxlen = sizeof(int),
5090 .mode = 0644,
5091 .proc_handler = proc_dointvec,
65f5c7c1 5092 },
c4fd30eb 5093 {
e21e8467
SH		 5094 .procname = "accept_ra_pinfo",
5095 .data = &ipv6_devconf.accept_ra_pinfo,
5096 .maxlen = sizeof(int),
5097 .mode = 0644,
5098 .proc_handler = proc_dointvec,
c4fd30eb 5099 },
930d6ff2
YH		 5100#ifdef CONFIG_IPV6_ROUTER_PREF
5101 {
e21e8467
SH		 5102 .procname = "accept_ra_rtr_pref",
5103 .data = &ipv6_devconf.accept_ra_rtr_pref,
5104 .maxlen = sizeof(int),
5105 .mode = 0644,
5106 .proc_handler = proc_dointvec,
930d6ff2 5107 },
52e16356 5108 {
e21e8467
SH		 5109 .procname = "router_probe_interval",
5110 .data = &ipv6_devconf.rtr_probe_interval,
5111 .maxlen = sizeof(int),
5112 .mode = 0644,
5113 .proc_handler = proc_dointvec_jiffies,
52e16356 5114 },
fa03ef38 5115#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 5116 {
e21e8467
SH		 5117 .procname = "accept_ra_rt_info_max_plen",
5118 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5119 .maxlen = sizeof(int),
5120 .mode = 0644,
5121 .proc_handler = proc_dointvec,
09c884d4
YH		 5122 },
5123#endif
930d6ff2 5124#endif
fbea49e1 5125 {
e21e8467
SH		 5126 .procname = "proxy_ndp",
5127 .data = &ipv6_devconf.proxy_ndp,
5128 .maxlen = sizeof(int),
5129 .mode = 0644,
c92d5491 5130 .proc_handler = addrconf_sysctl_proxy_ndp,
fbea49e1 5131 },
0bcbc926 5132 {
e21e8467
SH		 5133 .procname = "accept_source_route",
5134 .data = &ipv6_devconf.accept_source_route,
5135 .maxlen = sizeof(int),
5136 .mode = 0644,
5137 .proc_handler = proc_dointvec,
0bcbc926 5138 },
95c385b4
NH		 5139#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5140 {
e21e8467
SH		 5141 .procname = "optimistic_dad",
5142 .data = &ipv6_devconf.optimistic_dad,
5143 .maxlen = sizeof(int),
5144 .mode = 0644,
5145 .proc_handler = proc_dointvec,
95c385b4
NH		 5146
5147 },
7bc570c8
YH		 5148#endif
5149#ifdef CONFIG_IPV6_MROUTE
5150 {
e21e8467
SH		 5151 .procname = "mc_forwarding",
5152 .data = &ipv6_devconf.mc_forwarding,
5153 .maxlen = sizeof(int),
5154 .mode = 0444,
5155 .proc_handler = proc_dointvec,
7bc570c8 5156 },
95c385b4 5157#endif
778d80be 5158 {
e21e8467
SH		 5159 .procname = "disable_ipv6",
5160 .data = &ipv6_devconf.disable_ipv6,
5161 .maxlen = sizeof(int),
5162 .mode = 0644,
5163 .proc_handler = addrconf_sysctl_disable,
778d80be 5164 },
1b34be74 5165 {
e21e8467
SH		 5166 .procname = "accept_dad",
5167 .data = &ipv6_devconf.accept_dad,
5168 .maxlen = sizeof(int),
5169 .mode = 0644,
5170 .proc_handler = proc_dointvec,
1b34be74 5171 },
f7734fdf 5172 {
f7734fdf
OP		 5173 .procname = "force_tllao",
5174 .data = &ipv6_devconf.force_tllao,
5175 .maxlen = sizeof(int),
5176 .mode = 0644,
5177 .proc_handler = proc_dointvec
5178 },
5cb04436
HFS		 5179 {
5180 .procname = "ndisc_notify",
5181 .data = &ipv6_devconf.ndisc_notify,
5182 .maxlen = sizeof(int),
5183 .mode = 0644,
5184 .proc_handler = proc_dointvec
5185 },
b800c3b9
HFS		 5186 {
5187 .procname = "suppress_frag_ndisc",
5188 .data = &ipv6_devconf.suppress_frag_ndisc,
5189 .maxlen = sizeof(int),
5190 .mode = 0644,
5191 .proc_handler = proc_dointvec
5192 },
d9333196
BG		 5193 {
5194 .procname = "accept_ra_from_local",
5195 .data = &ipv6_devconf.accept_ra_from_local,
5196 .maxlen = sizeof(int),
5197 .mode = 0644,
5198 .proc_handler = proc_dointvec,
5199 },
1da177e4 5200 {
f8572d8f 5201 /* sentinel */
1da177e4
LT		 5202 }
5203 },
1da177e4
LT		 5204};
5205
bff16c2f 5206static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 5207 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 5208{
5209 int i;
1da177e4 5210 struct addrconf_sysctl_table *t;
6105e293 5211 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 5212
af879cc7 5213 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 5214 if (t == NULL)
f68635e6
PE		 5215 goto out;
5216
bcdd553f 5217 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 5218 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 5219 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 5220 t->addrconf_vars[i].extra2 = net;
1da177e4 5221 }
1da177e4 5222
6105e293 5223 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 5224
6105e293 5225 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
1da177e4 5226 if (t->sysctl_header == NULL)
6105e293 5227 goto free;
f68635e6
PE		 5228
5229 p->sysctl = t;
95897312 5230 return 0;
1da177e4 5231
f68635e6 5232free:
1da177e4 5233 kfree(t);
f68635e6 5234out:
95897312 5235 return -ENOBUFS;
1da177e4
LT		 5236}
5237
408c4768
PE		 5238static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5239{
5240 struct addrconf_sysctl_table *t;
5241
5242 if (p->sysctl == NULL)
5243 return;
5244
5245 t = p->sysctl;
5246 p->sysctl = NULL;
ff538818 5247 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 5248 kfree(t);
5249}
5250
f52295a9
PE		 5251static void addrconf_sysctl_register(struct inet6_dev *idev)
5252{
73af614a 5253 neigh_sysctl_register(idev->dev, idev->nd_parms,
f8572d8f 5254 &ndisc_ifinfo_sysctl_change);
c346dca1 5255 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 5256 idev, &idev->cnf);
f52295a9
PE		 5257}
5258
408c4768 5259static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 5260{
408c4768
PE		 5261 __addrconf_sysctl_unregister(&idev->cnf);
5262 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 5263}
5264
5265
5266#endif
5267
2c8c1e72 5268static int __net_init addrconf_init_net(struct net *net)
e0da5a48 5269{
a79ca223 5270 int err = -ENOMEM;
e0da5a48
PE		 5271 struct ipv6_devconf *all, *dflt;
5272
a79ca223
HZ		 5273 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5274 if (all == NULL)
5275 goto err_alloc_all;
e0da5a48 5276
a79ca223
HZ		 5277 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5278 if (dflt == NULL)
5279 goto err_alloc_dflt;
e0da5a48 5280
a79ca223
HZ		 5281 /* these will be inherited by all namespaces */
5282 dflt->autoconf = ipv6_defaults.autoconf;
5283 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 5284
5285 net->ipv6.devconf_all = all;
5286 net->ipv6.devconf_dflt = dflt;
5287
5288#ifdef CONFIG_SYSCTL
f8572d8f 5289 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 5290 if (err < 0)
5291 goto err_reg_all;
5292
f8572d8f 5293 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 5294 if (err < 0)
5295 goto err_reg_dflt;
5296#endif
5297 return 0;
5298
5299#ifdef CONFIG_SYSCTL
5300err_reg_dflt:
5301 __addrconf_sysctl_unregister(all);
5302err_reg_all:
5303 kfree(dflt);
5304#endif
5305err_alloc_dflt:
5306 kfree(all);
5307err_alloc_all:
5308 return err;
5309}
5310
2c8c1e72 5311static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 5312{
5313#ifdef CONFIG_SYSCTL
5314 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5315 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5316#endif
09ad9bc7 5317 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 5318 kfree(net->ipv6.devconf_dflt);
5319 kfree(net->ipv6.devconf_all);
5320 }
5321}
5322
5323static struct pernet_operations addrconf_ops = {
5324 .init = addrconf_init_net,
5325 .exit = addrconf_exit_net,
5326};
5327
b382b191
TG		 5328static struct rtnl_af_ops inet6_ops = {
5329 .family = AF_INET6,
5330 .fill_link_af = inet6_fill_link_af,
5331 .get_link_af_size = inet6_get_link_af_size,
f53adae4 5332 .set_link_af = inet6_set_link_af,
b382b191
TG		 5333};
5334
1da177e4
LT		 5335/*
5336 * Init / cleanup code
5337 */
5338
5339int __init addrconf_init(void)
5340{
c2e21293 5341 int i, err;
2a8cc6c8 5342
e21e8467
SH		 5343 err = ipv6_addr_label_init();
5344 if (err < 0) {
f3213831
JP		 5345 pr_crit("%s: cannot initialize default policy table: %d\n",
5346 __func__, err);
2cc6d2bf 5347 goto out;
2a8cc6c8 5348 }
1da177e4 5349
2cc6d2bf
NH		 5350 err = register_pernet_subsys(&addrconf_ops);
5351 if (err < 0)
5352 goto out_addrlabel;
e0da5a48 5353
c15b1cca
HFS		 5354 addrconf_wq = create_workqueue("ipv6_addrconf");
5355 if (!addrconf_wq) {
5356 err = -ENOMEM;
5357 goto out_nowq;
5358 }
5359
1da177e4
LT		 5360 /* The addrconf netdev notifier requires that loopback_dev
5361 * has it's ipv6 private information allocated and setup
5362 * before it can bring up and give link-local addresses
5363 * to other devices which are up.
5364 *
5365 * Unfortunately, loopback_dev is not necessarily the first
5366 * entry in the global dev_base list of net devices. In fact,
5367 * it is likely to be the very last entry on that list.
5368 * So this causes the notifier registry below to try and
5369 * give link-local addresses to all devices besides loopback_dev
5370 * first, then loopback_dev, which cases all the non-loopback_dev
5371 * devices to fail to get a link-local address.
5372 *
5373 * So, as a temporary fix, allocate the ipv6 structure for
5374 * loopback_dev first by hand.
5375 * Longer term, all of the dependencies ipv6 has upon the loopback
5376 * device and it being up should be removed.
5377 */
5378 rtnl_lock();
2774c7ab 5379 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 5380 err = -ENOMEM;
5381 rtnl_unlock();
5382 if (err)
e0da5a48 5383 goto errlo;
1da177e4 5384
c2e21293 5385 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5386 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5387
1da177e4
LT		 5388 register_netdevice_notifier(&ipv6_dev_notf);
5389
c15b1cca 5390 addrconf_verify();
c127ea2c 5391
3678a9d8 5392 rtnl_af_register(&inet6_ops);
b382b191 5393
c7ac8679
GR		 5394 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5395 NULL);
c127ea2c
TG		 5396 if (err < 0)
5397 goto errout;
5398
5399 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 5400 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5401 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5402 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5403 inet6_dump_ifaddr, NULL);
5404 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5405 inet6_dump_ifmcaddr, NULL);
5406 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5407 inet6_dump_ifacaddr, NULL);
76f8f6cb 5408 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 5409 inet6_netconf_dump_devconf, NULL);
c127ea2c 5410
2a8cc6c8
YH		 5411 ipv6_addr_label_rtnl_register();
5412
1da177e4 5413 return 0;
c127ea2c 5414errout:
b382b191 5415 rtnl_af_unregister(&inet6_ops);
c127ea2c 5416 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5417errlo:
c15b1cca
HFS		 5418 destroy_workqueue(addrconf_wq);
5419out_nowq:
e0da5a48 5420 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 5421out_addrlabel:
5422 ipv6_addr_label_cleanup();
5423out:
c127ea2c 5424 return err;
1da177e4
LT		 5425}
5426
09f7709f 5427void addrconf_cleanup(void)
1da177e4 5428{
176c39af 5429 struct net_device *dev;
1da177e4
LT		 5430 int i;
5431
5432 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5433 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 5434 ipv6_addr_label_cleanup();
1da177e4
LT		 5435
5436 rtnl_lock();
5437
b382b191
TG		 5438 __rtnl_af_unregister(&inet6_ops);
5439
176c39af
DL		 5440 /* clean dev list */
5441 for_each_netdev(&init_net, dev) {
5442 if (__in6_dev_get(dev) == NULL)
5443 continue;
5444 addrconf_ifdown(dev, 1);
5445 }
5446 addrconf_ifdown(init_net.loopback_dev, 2);
5447
1da177e4
LT		 5448 /*
5449 * Check hash table.
5450 */
5c578aed 5451 spin_lock_bh(&addrconf_hash_lock);
c2e21293 5452 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5453 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 5454 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 5455 cancel_delayed_work(&addr_chk_work);
1da177e4 5456 rtnl_unlock();
c15b1cca
HFS		 5457
5458 destroy_workqueue(addrconf_wq);
1da177e4 5459}
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