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ipv6: do retries on stable privacy addresses
[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 48#include <linux/net.h>
3d1bec99 49#include <linux/inet.h>
1da177e4
LT		 50#include <linux/in6.h>
51#include <linux/netdevice.h>
1823730f 52#include <linux/if_addr.h>
1da177e4
LT		 53#include <linux/if_arp.h>
54#include <linux/if_arcnet.h>
55#include <linux/if_infiniband.h>
56#include <linux/route.h>
57#include <linux/inetdevice.h>
58#include <linux/init.h>
5a0e3ad6 59#include <linux/slab.h>
1da177e4
LT		 60#ifdef CONFIG_SYSCTL
61#include <linux/sysctl.h>
62#endif
4fc268d2 63#include <linux/capability.h>
1da177e4
LT		 64#include <linux/delay.h>
65#include <linux/notifier.h>
543537bd 66#include <linux/string.h>
ddbe5032 67#include <linux/hash.h>
1da177e4 68
457c4cbc 69#include <net/net_namespace.h>
1da177e4
LT		 70#include <net/sock.h>
71#include <net/snmp.h>
72
06a4c1c5 73#include <net/af_ieee802154.h>
cb6bf355 74#include <net/firewire.h>
1da177e4
LT		 75#include <net/ipv6.h>
76#include <net/protocol.h>
77#include <net/ndisc.h>
78#include <net/ip6_route.h>
79#include <net/addrconf.h>
80#include <net/tcp.h>
81#include <net/ip.h>
5d620266 82#include <net/netlink.h>
f24e3d65 83#include <net/pkt_sched.h>
1da177e4
LT		 84#include <linux/if_tunnel.h>
85#include <linux/rtnetlink.h>
f3a1bfb1 86#include <linux/netconf.h>
1da177e4 87#include <linux/random.h>
e21e8467 88#include <linux/uaccess.h>
7f7d9a6b 89#include <asm/unaligned.h>
1da177e4
LT		 90
91#include <linux/proc_fs.h>
92#include <linux/seq_file.h>
bc3b2d7f 93#include <linux/export.h>
1da177e4
LT		 94
95/* Set to 3 to get tracing... */
96#define ACONF_DEBUG 2
97
98#if ACONF_DEBUG >= 3
ba3542e1 99#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
1da177e4 100#else
ba3542e1 101#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
1da177e4
LT		 102#endif
103
104#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e 105
3d1bec99
HFS		 106#define IPV6_MAX_STRLEN \
107 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
108
18a31e1e
TG		 109static inline u32 cstamp_delta(unsigned long cstamp)
110{
111 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
112}
1da177e4
LT		 113
114#ifdef CONFIG_SYSCTL
a317a2f1 115static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 116static void addrconf_sysctl_unregister(struct inet6_dev *idev);
117#else
a317a2f1 118static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 119{
a317a2f1 120 return 0;
408c4768
PE		 121}
122
123static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
124{
125}
1da177e4
LT		 126#endif
127
eb7e0575
SD		 128static void __ipv6_regen_rndid(struct inet6_dev *idev);
129static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 130static void ipv6_regen_rndid(unsigned long data);
1da177e4 131
1b34be74 132static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4 133static int ipv6_count_addresses(struct inet6_dev *idev);
622c81d5
HFS		 134static int ipv6_generate_stable_address(struct in6_addr *addr,
135 u8 dad_count,
136 const struct inet6_dev *idev);
1da177e4
LT		 137
138/*
139 * Configured unicast address hash table
140 */
c2e21293 141static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 142static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 143
c15b1cca
HFS		 144static void addrconf_verify(void);
145static void addrconf_verify_rtnl(void);
146static void addrconf_verify_work(struct work_struct *);
1da177e4 147
c15b1cca
HFS		 148static struct workqueue_struct *addrconf_wq;
149static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 150
151static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
152static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
153
93d9b7d7
JP		 154static void addrconf_type_change(struct net_device *dev,
155 unsigned long event);
1da177e4
LT		 156static int addrconf_ifdown(struct net_device *dev, int how);
157
21caa662
RK		 158static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
159 int plen,
160 const struct net_device *dev,
161 u32 flags, u32 noflags);
162
cf22f9a2 163static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 164static void addrconf_dad_work(struct work_struct *w);
1da177e4 165static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 166static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 167static void addrconf_rs_timer(unsigned long data);
168static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
169static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
170
1ab1457c 171static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 172 struct prefix_info *pinfo);
3e81c6da
DM		 173static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
174 struct net_device *dev);
1da177e4 175
888c848e 176static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 177 .forwarding = 0,
178 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
179 .mtu6 = IPV6_MIN_MTU,
180 .accept_ra = 1,
181 .accept_redirects = 1,
182 .autoconf = 1,
183 .force_mld_version = 0,
fc4eba58
HFS		 184 .mldv1_unsolicited_report_interval = 10 * HZ,
185 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 186 .dad_transmits = 1,
187 .rtr_solicits = MAX_RTR_SOLICITATIONS,
188 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
189 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 190 .use_tempaddr = 0,
1da177e4
LT		 191 .temp_valid_lft = TEMP_VALID_LIFETIME,
192 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
193 .regen_max_retry = REGEN_MAX_RETRY,
194 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 195 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 196 .accept_ra_defrtr = 1,
d9333196 197 .accept_ra_from_local = 0,
c4fd30eb 198 .accept_ra_pinfo = 1,
930d6ff2
YH		 199#ifdef CONFIG_IPV6_ROUTER_PREF
200 .accept_ra_rtr_pref = 1,
52e16356 201 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 202#ifdef CONFIG_IPV6_ROUTE_INFO
203 .accept_ra_rt_info_max_plen = 0,
204#endif
930d6ff2 205#endif
fbea49e1 206 .proxy_ndp = 0,
0bcbc926 207 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 208 .disable_ipv6 = 0,
1b34be74 209 .accept_dad = 1,
b800c3b9 210 .suppress_frag_ndisc = 1,
c2943f14 211 .accept_ra_mtu = 1,
3d1bec99
HFS		 212 .stable_secret = {
213 .initialized = false,
214 }
1da177e4
LT		 215};
216
ab32ea5d 217static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 218 .forwarding = 0,
219 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
220 .mtu6 = IPV6_MIN_MTU,
221 .accept_ra = 1,
222 .accept_redirects = 1,
223 .autoconf = 1,
fc4eba58
HFS		 224 .force_mld_version = 0,
225 .mldv1_unsolicited_report_interval = 10 * HZ,
226 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 227 .dad_transmits = 1,
228 .rtr_solicits = MAX_RTR_SOLICITATIONS,
229 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
230 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 231 .use_tempaddr = 0,
232 .temp_valid_lft = TEMP_VALID_LIFETIME,
233 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
234 .regen_max_retry = REGEN_MAX_RETRY,
235 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 236 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 237 .accept_ra_defrtr = 1,
d9333196 238 .accept_ra_from_local = 0,
c4fd30eb 239 .accept_ra_pinfo = 1,
930d6ff2
YH		 240#ifdef CONFIG_IPV6_ROUTER_PREF
241 .accept_ra_rtr_pref = 1,
52e16356 242 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 243#ifdef CONFIG_IPV6_ROUTE_INFO
244 .accept_ra_rt_info_max_plen = 0,
245#endif
930d6ff2 246#endif
fbea49e1 247 .proxy_ndp = 0,
0bcbc926 248 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 249 .disable_ipv6 = 0,
1b34be74 250 .accept_dad = 1,
b800c3b9 251 .suppress_frag_ndisc = 1,
c2943f14 252 .accept_ra_mtu = 1,
3d1bec99
HFS		 253 .stable_secret = {
254 .initialized = false,
255 },
1da177e4
LT		 256};
257
f24e3d65 258/* Check if a valid qdisc is available */
05297949 259static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 260{
05297949 261 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 262}
263
b7b1bfce 264static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 265{
b7b1bfce
HFS		 266 if (del_timer(&idev->rs_timer))
267 __in6_dev_put(idev);
268}
269
c15b1cca 270static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 271{
c15b1cca 272 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 273 __in6_ifa_put(ifp);
274}
275
b7b1bfce
HFS		 276static void addrconf_mod_rs_timer(struct inet6_dev *idev,
277 unsigned long when)
278{
279 if (!timer_pending(&idev->rs_timer))
280 in6_dev_hold(idev);
281 mod_timer(&idev->rs_timer, jiffies + when);
282}
1da177e4 283
c15b1cca
HFS		 284static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
285 unsigned long delay)
1da177e4 286{
c15b1cca 287 if (!delayed_work_pending(&ifp->dad_work))
1da177e4 288 in6_ifa_hold(ifp);
c15b1cca 289 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
1da177e4
LT		 290}
291
7f7d9a6b
HX		 292static int snmp6_alloc_dev(struct inet6_dev *idev)
293{
827da44c
JS		 294 int i;
295
698365fa
WC		 296 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
297 if (!idev->stats.ipv6)
7f7d9a6b 298 goto err_ip;
827da44c
JS		 299
300 for_each_possible_cpu(i) {
301 struct ipstats_mib *addrconf_stats;
698365fa 302 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 303 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 304 }
305
306
be281e55
ED		 307 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
308 GFP_KERNEL);
309 if (!idev->stats.icmpv6dev)
7f7d9a6b 310 goto err_icmp;
be281e55
ED		 311 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
312 GFP_KERNEL);
313 if (!idev->stats.icmpv6msgdev)
14878f75 314 goto err_icmpmsg;
7f7d9a6b
HX		 315
316 return 0;
317
14878f75 318err_icmpmsg:
be281e55 319 kfree(idev->stats.icmpv6dev);
7f7d9a6b 320err_icmp:
698365fa 321 free_percpu(idev->stats.ipv6);
7f7d9a6b 322err_ip:
aaf70ec7 323 return -ENOMEM;
7f7d9a6b
HX		 324}
325
8e5e8f30 326static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 327{
328 struct inet6_dev *ndev;
a317a2f1 329 int err = -ENOMEM;
1da177e4
LT		 330
331 ASSERT_RTNL();
332
333 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 334 return ERR_PTR(-EINVAL);
1da177e4 335
1ab1457c 336 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
1ab1457c 337 if (ndev == NULL)
a317a2f1 338 return ERR_PTR(err);
322f74a4
IO		 339
340 rwlock_init(&ndev->lock);
341 ndev->dev = dev;
502a2ffd 342 INIT_LIST_HEAD(&ndev->addr_list);
b7b1bfce
HFS		 343 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
344 (unsigned long)ndev);
c346dca1 345 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 346 ndev->cnf.mtu6 = dev->mtu;
347 ndev->cnf.sysctl = NULL;
348 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
349 if (ndev->nd_parms == NULL) {
350 kfree(ndev);
a317a2f1 351 return ERR_PTR(err);
322f74a4 352 }
0187bdfb
BH		 353 if (ndev->cnf.forwarding)
354 dev_disable_lro(dev);
322f74a4
IO		 355 /* We refer to the device */
356 dev_hold(dev);
1da177e4 357
322f74a4 358 if (snmp6_alloc_dev(ndev) < 0) {
ba3542e1 359 ADBG(KERN_WARNING
f3213831 360 "%s: cannot allocate memory for statistics; dev=%s.\n",
ba3542e1 361 __func__, dev->name);
322f74a4 362 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 363 dev_put(dev);
364 kfree(ndev);
a317a2f1 365 return ERR_PTR(err);
322f74a4 366 }
1da177e4 367
322f74a4 368 if (snmp6_register_dev(ndev) < 0) {
ba3542e1 369 ADBG(KERN_WARNING
f3213831 370 "%s: cannot create /proc/net/dev_snmp6/%s\n",
ba3542e1 371 __func__, dev->name);
a317a2f1 372 goto err_release;
322f74a4
IO		 373 }
374
375 /* One reference from device. We must do this before
376 * we invoke __ipv6_regen_rndid().
377 */
378 in6_dev_hold(ndev);
1da177e4 379
1b34be74
YH		 380 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
381 ndev->cnf.accept_dad = -1;
382
07a93626 383#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 384 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 385 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 386 ndev->cnf.rtr_solicits = 0;
387 }
388#endif
389
372e6c8f 390 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 391 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 392 if ((dev->flags&IFF_LOOPBACK) ||
393 dev->type == ARPHRD_TUNNEL ||
9625ed72 394 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 395 dev->type == ARPHRD_SIT ||
0be669bb 396 dev->type == ARPHRD_NONE) {
322f74a4
IO		 397 ndev->cnf.use_tempaddr = -1;
398 } else {
399 in6_dev_hold(ndev);
400 ipv6_regen_rndid((unsigned long) ndev);
401 }
5d9efa7e 402
914faa14 403 ndev->token = in6addr_any;
1da177e4 404
f24e3d65 405 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 406 ndev->if_flags |= IF_READY;
407
322f74a4
IO		 408 ipv6_mc_init_dev(ndev);
409 ndev->tstamp = jiffies;
a317a2f1
WC		 410 err = addrconf_sysctl_register(ndev);
411 if (err) {
412 ipv6_mc_destroy_dev(ndev);
413 del_timer(&ndev->regen_timer);
414 goto err_release;
415 }
30c4cf57 416 /* protected by rtnl_lock */
cf778b00 417 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 418
2c5e8933
HFS		 419 /* Join interface-local all-node multicast group */
420 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
421
d88ae4cc 422 /* Join all-node multicast group */
f3ee4010 423 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 424
d6ddef9e 425 /* Join all-router multicast group if forwarding is set */
8b2aaede 426 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 427 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
428
1da177e4 429 return ndev;
a317a2f1
WC		 430
431err_release:
432 neigh_parms_release(&nd_tbl, ndev->nd_parms);
433 ndev->dead = 1;
434 in6_dev_finish_destroy(ndev);
435 return ERR_PTR(err);
1da177e4
LT		 436}
437
8e5e8f30 438static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 439{
440 struct inet6_dev *idev;
441
442 ASSERT_RTNL();
443
e21e8467
SH		 444 idev = __in6_dev_get(dev);
445 if (!idev) {
446 idev = ipv6_add_dev(dev);
a317a2f1 447 if (IS_ERR(idev))
1da177e4
LT		 448 return NULL;
449 }
c5e33bdd 450
1da177e4
LT		 451 if (dev->flags&IFF_UP)
452 ipv6_mc_up(idev);
453 return idev;
454}
455
f3a1bfb1
ND		 456static int inet6_netconf_msgsize_devconf(int type)
457{
458 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
459 + nla_total_size(4); /* NETCONFA_IFINDEX */
460
76f8f6cb
ND		 461 /* type -1 is used for ALL */
462 if (type == -1 || type == NETCONFA_FORWARDING)
f3a1bfb1 463 size += nla_total_size(4);
b1afce95 464#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 465 if (type == -1 || type == NETCONFA_MC_FORWARDING)
466 size += nla_total_size(4);
b1afce95 467#endif
c92d5491 468 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
469 size += nla_total_size(4);
f3a1bfb1
ND		 470
471 return size;
472}
473
474static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
475 struct ipv6_devconf *devconf, u32 portid,
476 u32 seq, int event, unsigned int flags,
477 int type)
478{
479 struct nlmsghdr *nlh;
480 struct netconfmsg *ncm;
481
482 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
483 flags);
484 if (nlh == NULL)
485 return -EMSGSIZE;
486
487 ncm = nlmsg_data(nlh);
488 ncm->ncm_family = AF_INET6;
489
490 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
491 goto nla_put_failure;
492
76f8f6cb
ND		 493 /* type -1 is used for ALL */
494 if ((type == -1 || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 495 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
496 goto nla_put_failure;
b1afce95 497#ifdef CONFIG_IPV6_MROUTE
d67b8c61
ND		 498 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
499 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
500 devconf->mc_forwarding) < 0)
501 goto nla_put_failure;
b1afce95 502#endif
c92d5491 503 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
504 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
505 goto nla_put_failure;
506
053c095a
JB		 507 nlmsg_end(skb, nlh);
508 return 0;
f3a1bfb1
ND		 509
510nla_put_failure:
511 nlmsg_cancel(skb, nlh);
512 return -EMSGSIZE;
513}
514
d67b8c61
ND		 515void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
516 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 517{
518 struct sk_buff *skb;
519 int err = -ENOBUFS;
520
521 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
522 if (skb == NULL)
523 goto errout;
524
525 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
526 RTM_NEWNETCONF, 0, type);
527 if (err < 0) {
528 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
529 WARN_ON(err == -EMSGSIZE);
530 kfree_skb(skb);
531 goto errout;
532 }
533 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
534 return;
535errout:
bd779028 536 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 537}
538
76f8f6cb
ND		 539static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
540 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
541 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 542 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
76f8f6cb
ND		 543};
544
545static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 546 struct nlmsghdr *nlh)
76f8f6cb
ND		 547{
548 struct net *net = sock_net(in_skb->sk);
549 struct nlattr *tb[NETCONFA_MAX+1];
550 struct netconfmsg *ncm;
551 struct sk_buff *skb;
552 struct ipv6_devconf *devconf;
553 struct inet6_dev *in6_dev;
554 struct net_device *dev;
555 int ifindex;
556 int err;
557
558 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
559 devconf_ipv6_policy);
560 if (err < 0)
561 goto errout;
562
563 err = EINVAL;
564 if (!tb[NETCONFA_IFINDEX])
565 goto errout;
566
567 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
568 switch (ifindex) {
569 case NETCONFA_IFINDEX_ALL:
570 devconf = net->ipv6.devconf_all;
571 break;
572 case NETCONFA_IFINDEX_DEFAULT:
573 devconf = net->ipv6.devconf_dflt;
574 break;
575 default:
576 dev = __dev_get_by_index(net, ifindex);
577 if (dev == NULL)
578 goto errout;
579 in6_dev = __in6_dev_get(dev);
580 if (in6_dev == NULL)
581 goto errout;
582 devconf = &in6_dev->cnf;
583 break;
584 }
585
586 err = -ENOBUFS;
587 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
588 if (skb == NULL)
589 goto errout;
590
591 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
592 NETLINK_CB(in_skb).portid,
593 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
594 -1);
595 if (err < 0) {
596 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
597 WARN_ON(err == -EMSGSIZE);
598 kfree_skb(skb);
599 goto errout;
600 }
601 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
602errout:
603 return err;
604}
605
7a674200
ND		 606static int inet6_netconf_dump_devconf(struct sk_buff *skb,
607 struct netlink_callback *cb)
608{
609 struct net *net = sock_net(skb->sk);
610 int h, s_h;
611 int idx, s_idx;
612 struct net_device *dev;
613 struct inet6_dev *idev;
614 struct hlist_head *head;
615
616 s_h = cb->args[0];
617 s_idx = idx = cb->args[1];
618
619 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
620 idx = 0;
621 head = &net->dev_index_head[h];
622 rcu_read_lock();
63998ac2
ND		 623 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
624 net->dev_base_seq;
7a674200
ND		 625 hlist_for_each_entry_rcu(dev, head, index_hlist) {
626 if (idx < s_idx)
627 goto cont;
628 idev = __in6_dev_get(dev);
629 if (!idev)
630 goto cont;
631
632 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
633 &idev->cnf,
634 NETLINK_CB(cb->skb).portid,
635 cb->nlh->nlmsg_seq,
636 RTM_NEWNETCONF,
637 NLM_F_MULTI,
053c095a 638 -1) < 0) {
7a674200
ND		 639 rcu_read_unlock();
640 goto done;
641 }
63998ac2 642 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 643cont:
644 idx++;
645 }
646 rcu_read_unlock();
647 }
648 if (h == NETDEV_HASHENTRIES) {
649 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
650 net->ipv6.devconf_all,
651 NETLINK_CB(cb->skb).portid,
652 cb->nlh->nlmsg_seq,
653 RTM_NEWNETCONF, NLM_F_MULTI,
053c095a 654 -1) < 0)
7a674200
ND		 655 goto done;
656 else
657 h++;
658 }
659 if (h == NETDEV_HASHENTRIES + 1) {
660 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
661 net->ipv6.devconf_dflt,
662 NETLINK_CB(cb->skb).portid,
663 cb->nlh->nlmsg_seq,
664 RTM_NEWNETCONF, NLM_F_MULTI,
053c095a 665 -1) < 0)
7a674200
ND		 666 goto done;
667 else
668 h++;
669 }
670done:
671 cb->args[0] = h;
672 cb->args[1] = idx;
673
674 return skb->len;
675}
676
1da177e4
LT		 677#ifdef CONFIG_SYSCTL
678static void dev_forward_change(struct inet6_dev *idev)
679{
680 struct net_device *dev;
681 struct inet6_ifaddr *ifa;
1da177e4
LT		 682
683 if (!idev)
684 return;
685 dev = idev->dev;
0187bdfb
BH		 686 if (idev->cnf.forwarding)
687 dev_disable_lro(dev);
1a940835 688 if (dev->flags & IFF_MULTICAST) {
2c5e8933 689 if (idev->cnf.forwarding) {
f3ee4010 690 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 691 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
692 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
693 } else {
f3ee4010 694 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 695 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
696 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
697 }
1da177e4 698 }
502a2ffd 699
700 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 701 if (ifa->flags&IFA_F_TENTATIVE)
702 continue;
1da177e4
LT		 703 if (idev->cnf.forwarding)
704 addrconf_join_anycast(ifa);
705 else
706 addrconf_leave_anycast(ifa);
707 }
f3a1bfb1
ND		 708 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
709 dev->ifindex, &idev->cnf);
1da177e4
LT		 710}
711
712
e186932b 713static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 714{
715 struct net_device *dev;
716 struct inet6_dev *idev;
717
4acd4945 718 for_each_netdev(net, dev) {
1da177e4
LT		 719 idev = __in6_dev_get(dev);
720 if (idev) {
e186932b
PE		 721 int changed = (!idev->cnf.forwarding) ^ (!newf);
722 idev->cnf.forwarding = newf;
1da177e4
LT		 723 if (changed)
724 dev_forward_change(idev);
725 }
1da177e4 726 }
1da177e4 727}
c8fecf22 728
013d97e9 729static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 730{
bff16c2f 731 struct net *net;
013d97e9
FR		 732 int old;
733
734 if (!rtnl_trylock())
735 return restart_syscall();
bff16c2f
PE		 736
737 net = (struct net *)table->extra2;
013d97e9
FR		 738 old = *p;
739 *p = newf;
b325fddb 740
013d97e9 741 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 742 if ((!newf) ^ (!old))
743 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
744 NETCONFA_IFINDEX_DEFAULT,
745 net->ipv6.devconf_dflt);
013d97e9
FR		 746 rtnl_unlock();
747 return 0;
88af182e 748 }
c8fecf22 749
e186932b 750 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 751 net->ipv6.devconf_dflt->forwarding = newf;
752 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 753 if ((!newf) ^ (!old))
754 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
755 NETCONFA_IFINDEX_ALL,
756 net->ipv6.devconf_all);
013d97e9 757 } else if ((!newf) ^ (!old))
c8fecf22 758 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 759 rtnl_unlock();
c8fecf22 760
013d97e9 761 if (newf)
7b4da532 762 rt6_purge_dflt_routers(net);
b325fddb 763 return 1;
c8fecf22 764}
1da177e4
LT		 765#endif
766
5c578aed 767/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 768void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
769{
c2e21293 770 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 771
1da177e4 772#ifdef NET_REFCNT_DEBUG
91df42be 773 pr_debug("%s\n", __func__);
1da177e4
LT		 774#endif
775
776 in6_dev_put(ifp->idev);
777
c15b1cca
HFS		 778 if (cancel_delayed_work(&ifp->dad_work))
779 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
780 ifp);
1da177e4 781
e9d3e084 782 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 783 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 784 return;
785 }
94e187c0 786 ip6_rt_put(ifp->rt);
1da177e4 787
e5785985 788 kfree_rcu(ifp, rcu);
1da177e4
LT		 789}
790
e55ffac6
BH		 791static void
792ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
793{
502a2ffd 794 struct list_head *p;
8a6ce0c0 795 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 796
797 /*
798 * Each device address list is sorted in order of scope -
799 * global before linklocal.
800 */
502a2ffd 801 list_for_each(p, &idev->addr_list) {
802 struct inet6_ifaddr *ifa
803 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 804 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 805 break;
806 }
807
b54c9b98 808 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 809}
810
ddbe5032 811static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 812{
ddbe5032 813 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 814}
815
1da177e4
LT		 816/* On success it returns ifp with increased reference count */
817
818static struct inet6_ifaddr *
3f8f5298
JP		 819ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
820 const struct in6_addr *peer_addr, int pfxlen,
8a226b2c 821 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
1da177e4
LT		 822{
823 struct inet6_ifaddr *ifa = NULL;
824 struct rt6_info *rt;
3a88a81d 825 unsigned int hash;
1da177e4 826 int err = 0;
d68b8270
YH		 827 int addr_type = ipv6_addr_type(addr);
828
829 if (addr_type == IPV6_ADDR_ANY ||
830 addr_type & IPV6_ADDR_MULTICAST ||
831 (!(idev->dev->flags & IFF_LOOPBACK) &&
832 addr_type & IPV6_ADDR_LOOPBACK))
833 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 834
8814c4b5 835 rcu_read_lock_bh();
1da177e4
LT		 836 if (idev->dead) {
837 err = -ENODEV; /*XXX*/
838 goto out2;
839 }
840
56d417b1 841 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 842 err = -EACCES;
843 goto out2;
844 }
845
5c578aed 846 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 847
848 /* Ignore adding duplicate addresses on an interface */
c346dca1 849 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ba3542e1 850 ADBG("ipv6_add_addr: already assigned\n");
1da177e4
LT		 851 err = -EEXIST;
852 goto out;
853 }
854
322f74a4 855 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 856
857 if (ifa == NULL) {
ba3542e1 858 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 859 err = -ENOBUFS;
860 goto out;
861 }
862
8f031519 863 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 864 if (IS_ERR(rt)) {
865 err = PTR_ERR(rt);
866 goto out;
867 }
868
bba24896
JP		 869 neigh_parms_data_state_setall(idev->nd_parms);
870
4e3fd7a0 871 ifa->addr = *addr;
3f8f5298
JP		 872 if (peer_addr)
873 ifa->peer_addr = *peer_addr;
1da177e4
LT		 874
875 spin_lock_init(&ifa->lock);
c15b1cca 876 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 877 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 878 ifa->scope = scope;
879 ifa->prefix_len = pfxlen;
880 ifa->flags = flags | IFA_F_TENTATIVE;
8a226b2c
JB		 881 ifa->valid_lft = valid_lft;
882 ifa->prefered_lft = prefered_lft;
1da177e4 883 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 884 ifa->tokenized = false;
1da177e4 885
57f5f544
KF		 886 ifa->rt = rt;
887
1da177e4
LT		 888 ifa->idev = idev;
889 in6_dev_hold(idev);
890 /* For caller */
891 in6_ifa_hold(ifa);
892
893 /* Add to big hash table */
ddbe5032 894 hash = inet6_addr_hash(addr);
1da177e4 895
5c578aed 896 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 897 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 898
899 write_lock(&idev->lock);
900 /* Add to inet6_dev unicast addr list. */
e55ffac6 901 ipv6_link_dev_addr(idev, ifa);
1da177e4 902
1da177e4 903 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 904 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 905 in6_ifa_hold(ifa);
906 }
1da177e4 907
1da177e4
LT		 908 in6_ifa_hold(ifa);
909 write_unlock(&idev->lock);
910out2:
8814c4b5 911 rcu_read_unlock_bh();
1da177e4 912
fd92833a 913 if (likely(err == 0))
f88c91dd 914 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 915 else {
916 kfree(ifa);
917 ifa = ERR_PTR(err);
918 }
919
920 return ifa;
921out:
5c578aed 922 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 923 goto out2;
924}
925
5b84efec
TH		 926enum cleanup_prefix_rt_t {
927 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
928 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
929 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
930};
931
932/*
933 * Check, whether the prefix for ifp would still need a prefix route
934 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
935 * constants.
936 *
937 * 1) we don't purge prefix if address was not permanent.
938 * prefix is managed by its own lifetime.
939 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
940 * 3) if there are no addresses, delete prefix.
941 * 4) if there are still other permanent address(es),
942 * corresponding prefix is still permanent.
943 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
944 * don't purge the prefix, assume user space is managing it.
945 * 6) otherwise, update prefix lifetime to the
946 * longest valid lifetime among the corresponding
947 * addresses on the device.
948 * Note: subsequent RA will update lifetime.
949 **/
950static enum cleanup_prefix_rt_t
951check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
952{
953 struct inet6_ifaddr *ifa;
954 struct inet6_dev *idev = ifp->idev;
955 unsigned long lifetime;
956 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
957
958 *expires = jiffies;
959
960 list_for_each_entry(ifa, &idev->addr_list, if_list) {
961 if (ifa == ifp)
962 continue;
963 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
964 ifp->prefix_len))
965 continue;
966 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
967 return CLEANUP_PREFIX_RT_NOP;
968
969 action = CLEANUP_PREFIX_RT_EXPIRE;
970
971 spin_lock(&ifa->lock);
972
973 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
974 /*
975 * Note: Because this address is
976 * not permanent, lifetime <
977 * LONG_MAX / HZ here.
978 */
979 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
980 *expires = ifa->tstamp + lifetime * HZ;
981 spin_unlock(&ifa->lock);
982 }
983
984 return action;
985}
986
987static void
988cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
989{
990 struct rt6_info *rt;
991
992 rt = addrconf_get_prefix_route(&ifp->addr,
993 ifp->prefix_len,
994 ifp->idev->dev,
995 0, RTF_GATEWAY | RTF_DEFAULT);
996 if (rt) {
997 if (del_rt)
998 ip6_del_rt(rt);
999 else {
1000 if (!(rt->rt6i_flags & RTF_EXPIRES))
1001 rt6_set_expires(rt, expires);
1002 ip6_rt_put(rt);
1003 }
1004 }
1005}
1006
1007
1da177e4
LT		 1008/* This function wants to get referenced ifp and releases it before return */
1009
1010static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1011{
4c5ff6a6 1012 int state;
5b84efec
TH		 1013 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1014 unsigned long expires;
1da177e4 1015
c15b1cca
HFS		 1016 ASSERT_RTNL();
1017
8e8e676d 1018 spin_lock_bh(&ifp->lock);
4c5ff6a6 1019 state = ifp->state;
e9d3e084 1020 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1021 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1022
1023 if (state == INET6_IFADDR_STATE_DEAD)
1024 goto out;
1da177e4 1025
5c578aed 1026 spin_lock_bh(&addrconf_hash_lock);
1027 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1028 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1029
5b84efec 1030 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1031
1da177e4 1032 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1033 list_del(&ifp->tmp_list);
1034 if (ifp->ifpub) {
1035 in6_ifa_put(ifp->ifpub);
1036 ifp->ifpub = NULL;
1da177e4 1037 }
372e6c8f 1038 __in6_ifa_put(ifp);
1da177e4 1039 }
1da177e4 1040
5b84efec
TH		 1041 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1042 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1043
5b84efec
TH		 1044 list_del_init(&ifp->if_list);
1045 __in6_ifa_put(ifp);
1046
1047 write_unlock_bh(&ifp->idev->lock);
1da177e4 1048
c15b1cca 1049 addrconf_del_dad_work(ifp);
b2238566 1050
1da177e4
LT		 1051 ipv6_ifa_notify(RTM_DELADDR, ifp);
1052
f88c91dd 1053 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1054
5b84efec
TH		 1055 if (action != CLEANUP_PREFIX_RT_NOP) {
1056 cleanup_prefix_route(ifp, expires,
1057 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1058 }
1059
c3968a85
DW		 1060 /* clean up prefsrc entries */
1061 rt6_remove_prefsrc(ifp);
4c5ff6a6 1062out:
1da177e4
LT		 1063 in6_ifa_put(ifp);
1064}
1065
1da177e4
LT		 1066static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1067{
1068 struct inet6_dev *idev = ifp->idev;
1069 struct in6_addr addr, *tmpaddr;
76f793e3 1070 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1071 unsigned long regen_advance;
1da177e4
LT		 1072 int tmp_plen;
1073 int ret = 0;
95c385b4 1074 u32 addr_flags;
76f793e3 1075 unsigned long now = jiffies;
1da177e4 1076
53bd6749 1077 write_lock_bh(&idev->lock);
1da177e4
LT		 1078 if (ift) {
1079 spin_lock_bh(&ift->lock);
1080 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1081 spin_unlock_bh(&ift->lock);
1082 tmpaddr = &addr;
1083 } else {
1084 tmpaddr = NULL;
1085 }
1086retry:
1087 in6_dev_hold(idev);
1088 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1089 write_unlock_bh(&idev->lock);
f3213831 1090 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1091 in6_dev_put(idev);
1092 ret = -1;
1093 goto out;
1094 }
1095 spin_lock_bh(&ifp->lock);
1096 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1097 idev->cnf.use_tempaddr = -1; /*XXX*/
1098 spin_unlock_bh(&ifp->lock);
53bd6749 1099 write_unlock_bh(&idev->lock);
f3213831
JP		 1100 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1101 __func__);
1da177e4
LT		 1102 in6_dev_put(idev);
1103 ret = -1;
1104 goto out;
1105 }
1106 in6_ifa_hold(ifp);
1107 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 1108 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1109 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1110 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 1111 tmp_valid_lft = min_t(__u32,
1112 ifp->valid_lft,
7a876b0e 1113 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 1114 tmp_prefered_lft = min_t(__u32,
1115 ifp->prefered_lft,
7a876b0e 1116 idev->cnf.temp_prefered_lft + age -
784e2710 1117 idev->cnf.max_desync_factor);
1da177e4 1118 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1119 tmp_tstamp = ifp->tstamp;
1120 spin_unlock_bh(&ifp->lock);
1121
eac55bf9 1122 regen_advance = idev->cnf.regen_max_retry *
67ba4152
IM		 1123 idev->cnf.dad_transmits *
1124 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
53bd6749 1125 write_unlock_bh(&idev->lock);
95c385b4 1126
eac55bf9
BB		 1127 /* A temporary address is created only if this calculated Preferred
1128 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1129 * an implementation must not create a temporary address with a zero
1130 * Preferred Lifetime.
ecab6701
HK		 1131 * Use age calculation as in addrconf_verify to avoid unnecessary
1132 * temporary addresses being generated.
eac55bf9 1133 */
ecab6701
HK		 1134 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1135 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1136 in6_ifa_put(ifp);
1137 in6_dev_put(idev);
1138 ret = -1;
1139 goto out;
1140 }
1141
95c385b4
NH		 1142 addr_flags = IFA_F_TEMPORARY;
1143 /* set in addrconf_prefix_rcv() */
1144 if (ifp->flags & IFA_F_OPTIMISTIC)
1145 addr_flags |= IFA_F_OPTIMISTIC;
1146
4b08a8f1
HFS		 1147 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1148 ipv6_addr_scope(&addr), addr_flags,
1149 tmp_valid_lft, tmp_prefered_lft);
1150 if (IS_ERR(ift)) {
1da177e4
LT		 1151 in6_ifa_put(ifp);
1152 in6_dev_put(idev);
f3213831 1153 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1154 tmpaddr = &addr;
53bd6749 1155 write_lock_bh(&idev->lock);
1da177e4
LT		 1156 goto retry;
1157 }
1158
1159 spin_lock_bh(&ift->lock);
1160 ift->ifpub = ifp;
76f793e3 1161 ift->cstamp = now;
1da177e4
LT		 1162 ift->tstamp = tmp_tstamp;
1163 spin_unlock_bh(&ift->lock);
1164
cf22f9a2 1165 addrconf_dad_start(ift);
1da177e4
LT		 1166 in6_ifa_put(ift);
1167 in6_dev_put(idev);
1168out:
1169 return ret;
1170}
1da177e4
LT		 1171
1172/*
072047e4 1173 * Choose an appropriate source address (RFC3484)
1da177e4 1174 */
a9b05723
YH		 1175enum {
1176 IPV6_SADDR_RULE_INIT = 0,
1177 IPV6_SADDR_RULE_LOCAL,
1178 IPV6_SADDR_RULE_SCOPE,
1179 IPV6_SADDR_RULE_PREFERRED,
1180#ifdef CONFIG_IPV6_MIP6
1181 IPV6_SADDR_RULE_HOA,
1182#endif
1183 IPV6_SADDR_RULE_OIF,
1184 IPV6_SADDR_RULE_LABEL,
a9b05723 1185 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1186 IPV6_SADDR_RULE_ORCHID,
1187 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1188#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1189 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1190#endif
a9b05723
YH		 1191 IPV6_SADDR_RULE_MAX
1192};
1193
072047e4 1194struct ipv6_saddr_score {
a9b05723
YH		 1195 int rule;
1196 int addr_type;
1197 struct inet6_ifaddr *ifa;
1198 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1199 int scopedist;
1200 int matchlen;
072047e4
YH		 1201};
1202
a9b05723 1203struct ipv6_saddr_dst {
9acd9f3a 1204 const struct in6_addr *addr;
a9b05723
YH		 1205 int ifindex;
1206 int scope;
1207 int label;
7cbca67c 1208 unsigned int prefs;
a9b05723 1209};
072047e4 1210
b6f99a21 1211static inline int ipv6_saddr_preferred(int type)
1da177e4 1212{
45bb0060 1213 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1214 return 1;
1215 return 0;
1da177e4
LT		 1216}
1217
7fd2561e
EK		 1218static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1219{
1220#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1221 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1222#else
1223 return false;
1224#endif
1225}
1226
3de23255
BT		 1227static int ipv6_get_saddr_eval(struct net *net,
1228 struct ipv6_saddr_score *score,
a9b05723
YH		 1229 struct ipv6_saddr_dst *dst,
1230 int i)
1231{
1232 int ret;
1233
1234 if (i <= score->rule) {
1235 switch (i) {
1236 case IPV6_SADDR_RULE_SCOPE:
1237 ret = score->scopedist;
1238 break;
1239 case IPV6_SADDR_RULE_PREFIX:
1240 ret = score->matchlen;
1241 break;
1242 default:
1243 ret = !!test_bit(i, score->scorebits);
1244 }
1245 goto out;
1246 }
1247
1248 switch (i) {
1249 case IPV6_SADDR_RULE_INIT:
1250 /* Rule 0: remember if hiscore is not ready yet */
1251 ret = !!score->ifa;
1252 break;
1253 case IPV6_SADDR_RULE_LOCAL:
1254 /* Rule 1: Prefer same address */
1255 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1256 break;
1257 case IPV6_SADDR_RULE_SCOPE:
1258 /* Rule 2: Prefer appropriate scope
1259 *
1260 * ret
1261 * ^
1262 * -1 | d 15
1263 * ---+--+-+---> scope
1264 * |
1265 * | d is scope of the destination.
1266 * B-d | \
1267 * | \ <- smaller scope is better if
db9c7c39 1268 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1269 * | ret = B - scope (-1 <= scope >= d <= 15).
1270 * d-C-1 | /
1271 * |/ <- greater is better
1272 * -C / if scope is not enough for destination.
1273 * /| ret = scope - C (-1 <= d < scope <= 15).
1274 *
1275 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1276 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1277 * Assume B = 0 and we get C > 29.
1278 */
1279 ret = __ipv6_addr_src_scope(score->addr_type);
1280 if (ret >= dst->scope)
1281 ret = -ret;
1282 else
1283 ret -= 128; /* 30 is enough */
1284 score->scopedist = ret;
1285 break;
1286 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1287 {
a9b05723 1288 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1289 u8 avoid = IFA_F_DEPRECATED;
1290
1291 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1292 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1293 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1294 !(score->ifa->flags & avoid);
a9b05723 1295 break;
7fd2561e 1296 }
a9b05723
YH		 1297#ifdef CONFIG_IPV6_MIP6
1298 case IPV6_SADDR_RULE_HOA:
7cbca67c 1299 {
a9b05723 1300 /* Rule 4: Prefer home address */
7cbca67c
YH		 1301 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1302 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1303 break;
7cbca67c 1304 }
a9b05723
YH		 1305#endif
1306 case IPV6_SADDR_RULE_OIF:
1307 /* Rule 5: Prefer outgoing interface */
1308 ret = (!dst->ifindex ||
1309 dst->ifindex == score->ifa->idev->dev->ifindex);
1310 break;
1311 case IPV6_SADDR_RULE_LABEL:
1312 /* Rule 6: Prefer matching label */
3de23255
BT		 1313 ret = ipv6_addr_label(net,
1314 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1315 score->ifa->idev->dev->ifindex) == dst->label;
1316 break;
a9b05723 1317 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1318 {
a9b05723 1319 /* Rule 7: Prefer public address
25985edc 1320 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1321 */
7cbca67c
YH		 1322 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1323 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1324 score->ifa->idev->cnf.use_tempaddr >= 2;
1325 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1326 break;
7cbca67c 1327 }
a9b05723
YH		 1328 case IPV6_SADDR_RULE_ORCHID:
1329 /* Rule 8-: Prefer ORCHID vs ORCHID or
1330 * non-ORCHID vs non-ORCHID
1331 */
1332 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1333 ipv6_addr_orchid(dst->addr));
1334 break;
1335 case IPV6_SADDR_RULE_PREFIX:
1336 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1337 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1338 if (ret > score->ifa->prefix_len)
1339 ret = score->ifa->prefix_len;
1340 score->matchlen = ret;
a9b05723 1341 break;
7fd2561e
EK		 1342#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1343 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1344 /* Optimistic addresses still have lower precedence than other
1345 * preferred addresses.
1346 */
1347 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1348 break;
1349#endif
a9b05723
YH		 1350 default:
1351 ret = 0;
1352 }
1353
1354 if (ret)
1355 __set_bit(i, score->scorebits);
1356 score->rule = i;
1357out:
1358 return ret;
1359}
1360
b3f644fc 1361int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1362 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1363 struct in6_addr *saddr)
1da177e4 1364{
a9b05723
YH		 1365 struct ipv6_saddr_score scores[2],
1366 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1367 struct ipv6_saddr_dst dst;
072047e4 1368 struct net_device *dev;
a9b05723 1369 int dst_type;
1da177e4 1370
a9b05723
YH		 1371 dst_type = __ipv6_addr_type(daddr);
1372 dst.addr = daddr;
1373 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1374 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1375 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1376 dst.prefs = prefs;
a9b05723
YH		 1377
1378 hiscore->rule = -1;
1379 hiscore->ifa = NULL;
1da177e4 1380
8814c4b5 1381 rcu_read_lock();
1da177e4 1382
c6d14c84 1383 for_each_netdev_rcu(net, dev) {
072047e4 1384 struct inet6_dev *idev;
072047e4 1385
a9b05723 1386 /* Candidate Source Address (section 4)
072047e4
YH		 1387 * - multicast and link-local destination address,
1388 * the set of candidate source address MUST only
1389 * include addresses assigned to interfaces
1390 * belonging to the same link as the outgoing
1391 * interface.
1392 * (- For site-local destination addresses, the
1393 * set of candidate source addresses MUST only
1394 * include addresses assigned to interfaces
1395 * belonging to the same site as the outgoing
1396 * interface.)
1397 */
a9b05723
YH		 1398 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1399 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1400 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1401 continue;
1da177e4 1402
1da177e4 1403 idev = __in6_dev_get(dev);
072047e4
YH		 1404 if (!idev)
1405 continue;
1406
1407 read_lock_bh(&idev->lock);
502a2ffd 1408 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1409 int i;
072047e4 1410
a9b05723 1411 /*
6b3ae80a
YH		 1412 * - Tentative Address (RFC2462 section 5.4)
1413 * - A tentative address is not considered
1414 * "assigned to an interface" in the traditional
95c385b4 1415 * sense, unless it is also flagged as optimistic.
6b3ae80a 1416 * - Candidate Source Address (section 4)
072047e4
YH		 1417 * - In any case, anycast addresses, multicast
1418 * addresses, and the unspecified address MUST
1419 * NOT be included in a candidate set.
1420 */
a9b05723
YH		 1421 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1422 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1423 continue;
a9b05723
YH		 1424
1425 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1426
1427 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1428 score->addr_type & IPV6_ADDR_MULTICAST)) {
ba7a46f1
JP		 1429 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1430 dev->name);
072047e4
YH		 1431 continue;
1432 }
1433
a9b05723
YH		 1434 score->rule = -1;
1435 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1436
1437 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1438 int minihiscore, miniscore;
1439
3de23255
BT		 1440 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1441 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1442
1443 if (minihiscore > miniscore) {
1444 if (i == IPV6_SADDR_RULE_SCOPE &&
1445 score->scopedist > 0) {
1446 /*
1447 * special case:
1448 * each remaining entry
1449 * has too small (not enough)
1450 * scope, because ifa entries
1451 * are sorted by their scope
1452 * values.
1453 */
1454 goto try_nextdev;
1455 }
1456 break;
1457 } else if (minihiscore < miniscore) {
a9b05723
YH		 1458 if (hiscore->ifa)
1459 in6_ifa_put(hiscore->ifa);
1460
1461 in6_ifa_hold(score->ifa);
1462
a0bffffc 1463 swap(hiscore, score);
a9b05723
YH		 1464
1465 /* restore our iterator */
1466 score->ifa = hiscore->ifa;
1467
1468 break;
1da177e4 1469 }
072047e4 1470 }
1da177e4 1471 }
a9b05723 1472try_nextdev:
072047e4 1473 read_unlock_bh(&idev->lock);
1da177e4 1474 }
8814c4b5 1475 rcu_read_unlock();
1da177e4 1476
a9b05723 1477 if (!hiscore->ifa)
072047e4 1478 return -EADDRNOTAVAIL;
1ab1457c 1479
4e3fd7a0 1480 *saddr = hiscore->ifa->addr;
a9b05723 1481 in6_ifa_put(hiscore->ifa);
072047e4 1482 return 0;
1da177e4 1483}
5e5f3f0f 1484EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1485
8965779d 1486int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1487 u32 banned_flags)
b7b1bfce
HFS		 1488{
1489 struct inet6_ifaddr *ifp;
1490 int err = -EADDRNOTAVAIL;
1491
602582ca
HFS		 1492 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1493 if (ifp->scope > IFA_LINK)
1494 break;
b7b1bfce
HFS		 1495 if (ifp->scope == IFA_LINK &&
1496 !(ifp->flags & banned_flags)) {
1497 *addr = ifp->addr;
1498 err = 0;
1499 break;
1500 }
1501 }
1502 return err;
1503}
1504
95c385b4 1505int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1506 u32 banned_flags)
1da177e4
LT		 1507{
1508 struct inet6_dev *idev;
1509 int err = -EADDRNOTAVAIL;
1510
8814c4b5 1511 rcu_read_lock();
e21e8467
SH		 1512 idev = __in6_dev_get(dev);
1513 if (idev) {
1da177e4 1514 read_lock_bh(&idev->lock);
b7b1bfce 1515 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1516 read_unlock_bh(&idev->lock);
1517 }
8814c4b5 1518 rcu_read_unlock();
1da177e4
LT		 1519 return err;
1520}
1521
1522static int ipv6_count_addresses(struct inet6_dev *idev)
1523{
1524 int cnt = 0;
1525 struct inet6_ifaddr *ifp;
1526
1527 read_lock_bh(&idev->lock);
502a2ffd 1528 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1529 cnt++;
1530 read_unlock_bh(&idev->lock);
1531 return cnt;
1532}
1533
b71d1d42 1534int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1535 const struct net_device *dev, int strict)
c58da4c6
EK		 1536{
1537 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1538}
1539EXPORT_SYMBOL(ipv6_chk_addr);
1540
1541int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1542 const struct net_device *dev, int strict,
1543 u32 banned_flags)
1da177e4 1544{
eedf042a 1545 struct inet6_ifaddr *ifp;
ddbe5032 1546 unsigned int hash = inet6_addr_hash(addr);
c58da4c6 1547 u32 ifp_flags;
1da177e4 1548
5c578aed 1549 rcu_read_lock_bh();
b67bfe0d 1550 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1551 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1552 continue;
c58da4c6
EK		 1553 /* Decouple optimistic from tentative for evaluation here.
1554 * Ban optimistic addresses explicitly, when required.
1555 */
1556 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1557 ? (ifp->flags&~IFA_F_TENTATIVE)
1558 : ifp->flags;
1da177e4 1559 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1560 !(ifp_flags&banned_flags) &&
eedf042a
SH		 1561 (dev == NULL || ifp->idev->dev == dev ||
1562 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1563 rcu_read_unlock_bh();
1564 return 1;
1da177e4
LT		 1565 }
1566 }
5c578aed 1567
eedf042a
SH		 1568 rcu_read_unlock_bh();
1569 return 0;
1da177e4 1570}
c58da4c6 1571EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1572
3e81c6da
DM		 1573static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1574 struct net_device *dev)
1da177e4 1575{
ddbe5032 1576 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1577 struct inet6_ifaddr *ifp;
1da177e4 1578
b67bfe0d 1579 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1580 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1581 continue;
1da177e4
LT		 1582 if (ipv6_addr_equal(&ifp->addr, addr)) {
1583 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1584 return true;
1da177e4
LT		 1585 }
1586 }
3e81c6da 1587 return false;
1da177e4
LT		 1588}
1589
7df37ff3
CB		 1590/* Compares an address/prefix_len with addresses on device @dev.
1591 * If one is found it returns true.
1592 */
1593bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1594 const unsigned int prefix_len, struct net_device *dev)
1595{
1596 struct inet6_dev *idev;
1597 struct inet6_ifaddr *ifa;
1598 bool ret = false;
1599
1600 rcu_read_lock();
1601 idev = __in6_dev_get(dev);
1602 if (idev) {
1603 read_lock_bh(&idev->lock);
1604 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1605 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1606 if (ret)
1607 break;
1608 }
1609 read_unlock_bh(&idev->lock);
1610 }
1611 rcu_read_unlock();
1612
1613 return ret;
1614}
1615EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1616
b71d1d42 1617int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1618{
1619 struct inet6_dev *idev;
1620 struct inet6_ifaddr *ifa;
1621 int onlink;
1622
1623 onlink = 0;
1624 rcu_read_lock();
1625 idev = __in6_dev_get(dev);
1626 if (idev) {
1627 read_lock_bh(&idev->lock);
502a2ffd 1628 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1629 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1630 ifa->prefix_len);
1631 if (onlink)
1632 break;
1633 }
1634 read_unlock_bh(&idev->lock);
1635 }
1636 rcu_read_unlock();
1637 return onlink;
1638}
52eeeb84
YH		 1639EXPORT_SYMBOL(ipv6_chk_prefix);
1640
9acd9f3a 1641struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1642 struct net_device *dev, int strict)
1da177e4 1643{
b79d1d54 1644 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1645 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1646
5c578aed 1647 rcu_read_lock_bh();
b67bfe0d 1648 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1649 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1650 continue;
1da177e4
LT		 1651 if (ipv6_addr_equal(&ifp->addr, addr)) {
1652 if (dev == NULL || ifp->idev->dev == dev ||
1653 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1654 result = ifp;
1da177e4
LT		 1655 in6_ifa_hold(ifp);
1656 break;
1657 }
1658 }
1659 }
5c578aed 1660 rcu_read_unlock_bh();
1da177e4 1661
b79d1d54 1662 return result;
1da177e4
LT		 1663}
1664
1da177e4
LT		 1665/* Gets referenced address, destroys ifaddr */
1666
cc411d0b 1667static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1668{
1da177e4
LT		 1669 if (ifp->flags&IFA_F_PERMANENT) {
1670 spin_lock_bh(&ifp->lock);
c15b1cca 1671 addrconf_del_dad_work(ifp);
1da177e4 1672 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1673 if (dad_failed)
1674 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1675 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1676 if (dad_failed)
1677 ipv6_ifa_notify(0, ifp);
1da177e4 1678 in6_ifa_put(ifp);
1da177e4
LT		 1679 } else if (ifp->flags&IFA_F_TEMPORARY) {
1680 struct inet6_ifaddr *ifpub;
1681 spin_lock_bh(&ifp->lock);
1682 ifpub = ifp->ifpub;
1683 if (ifpub) {
1684 in6_ifa_hold(ifpub);
1685 spin_unlock_bh(&ifp->lock);
1686 ipv6_create_tempaddr(ifpub, ifp);
1687 in6_ifa_put(ifpub);
1688 } else {
1689 spin_unlock_bh(&ifp->lock);
1690 }
1691 ipv6_del_addr(ifp);
c15b1cca 1692 } else {
1da177e4 1693 ipv6_del_addr(ifp);
c15b1cca 1694 }
1da177e4
LT		 1695}
1696
f2344a13
HX		 1697static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1698{
1699 int err = -ENOENT;
1700
8e8e676d 1701 spin_lock_bh(&ifp->lock);
f2344a13
HX		 1702 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1703 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1704 err = 0;
1705 }
8e8e676d 1706 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 1707
1708 return err;
1709}
1710
3c21edbd
YH		 1711void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1712{
5f40ef77 1713 struct in6_addr addr;
1b34be74 1714 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1715
853dc2e0
UB		 1716 if (addrconf_dad_end(ifp)) {
1717 in6_ifa_put(ifp);
f2344a13 1718 return;
853dc2e0 1719 }
f2344a13 1720
e87cc472
JP		 1721 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1722 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1723
5f40ef77
HFS		 1724 spin_lock_bh(&ifp->lock);
1725
1726 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1727 int scope = ifp->scope;
1728 u32 flags = ifp->flags;
1729 struct in6_addr new_addr;
1730 struct inet6_ifaddr *ifp2;
1731 u32 valid_lft, preferred_lft;
1732 int pfxlen = ifp->prefix_len;
1733 const unsigned int idgen_retries = 3;
1734 const unsigned int idgen_delay = 1 * HZ;
1735 int retries = ifp->stable_privacy_retry + 1;
1736
1737 if (retries > idgen_retries) {
1738 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1739 ifp->idev->dev->name);
1740 goto errdad;
1741 }
1742
1743 new_addr = ifp->addr;
1744 if (ipv6_generate_stable_address(&new_addr, retries,
1745 idev))
1746 goto errdad;
1747
1748 valid_lft = ifp->valid_lft;
1749 preferred_lft = ifp->prefered_lft;
1750
1751 spin_unlock_bh(&ifp->lock);
1b34be74 1752
5f40ef77
HFS		 1753 if (idev->cnf.max_addresses &&
1754 ipv6_count_addresses(idev) >=
1755 idev->cnf.max_addresses)
1756 goto lock_errdad;
1757
1758 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1759 ifp->idev->dev->name);
1760
1761 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1762 scope, flags, valid_lft,
1763 preferred_lft);
1764 if (IS_ERR(ifp2))
1765 goto lock_errdad;
1766
1767 spin_lock_bh(&ifp2->lock);
1768 ifp2->stable_privacy_retry = retries;
1769 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1770 spin_unlock_bh(&ifp2->lock);
1771
1772 addrconf_mod_dad_work(ifp2, idgen_delay);
1773 in6_ifa_put(ifp2);
1774lock_errdad:
1775 spin_lock_bh(&ifp->lock);
1776 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1b34be74
YH		 1777 addr.s6_addr32[0] = htonl(0xfe800000);
1778 addr.s6_addr32[1] = 0;
1779
1780 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1781 ipv6_addr_equal(&ifp->addr, &addr)) {
1782 /* DAD failed for link-local based on MAC address */
1783 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1784
f3213831 1785 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1786 ifp->idev->dev->name);
1b34be74
YH		 1787 }
1788 }
1789
5f40ef77 1790errdad:
c15b1cca
HFS		 1791 /* transition from _POSTDAD to _ERRDAD */
1792 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 1793 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 1794
1795 addrconf_mod_dad_work(ifp, 0);
3c21edbd 1796}
1da177e4 1797
a9ed4a29
SD		 1798/* Join to solicited addr multicast group.
1799 * caller must hold RTNL */
b71d1d42 1800void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1801{
1802 struct in6_addr maddr;
1803
1804 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1805 return;
1806
1807 addrconf_addr_solict_mult(addr, &maddr);
1808 ipv6_dev_mc_inc(dev, &maddr);
1809}
1810
a9ed4a29 1811/* caller must hold RTNL */
b71d1d42 1812void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1813{
1814 struct in6_addr maddr;
1815
1816 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1817 return;
1818
1819 addrconf_addr_solict_mult(addr, &maddr);
1820 __ipv6_dev_mc_dec(idev, &maddr);
1821}
1822
a9ed4a29 1823/* caller must hold RTNL */
20380731 1824static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1825{
1826 struct in6_addr addr;
c15b1cca 1827
88ad3149 1828 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 1829 return;
1da177e4
LT		 1830 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1831 if (ipv6_addr_any(&addr))
1832 return;
013b4d90 1833 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 1834}
1835
a9ed4a29 1836/* caller must hold RTNL */
20380731 1837static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1838{
1839 struct in6_addr addr;
c15b1cca 1840
88ad3149 1841 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 1842 return;
1da177e4
LT		 1843 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1844 if (ipv6_addr_any(&addr))
1845 return;
1846 __ipv6_dev_ac_dec(ifp->idev, &addr);
1847}
1848
073a8e0e
YH		 1849static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1850{
1851 if (dev->addr_len != ETH_ALEN)
1852 return -1;
1853 memcpy(eui, dev->dev_addr, 3);
1854 memcpy(eui + 5, dev->dev_addr + 3, 3);
1855
1856 /*
1857 * The zSeries OSA network cards can be shared among various
1858 * OS instances, but the OSA cards have only one MAC address.
1859 * This leads to duplicate address conflicts in conjunction
1860 * with IPv6 if more than one instance uses the same card.
1861 *
1862 * The driver for these cards can deliver a unique 16-bit
1863 * identifier for each instance sharing the same card. It is
1864 * placed instead of 0xFFFE in the interface identifier. The
1865 * "u" bit of the interface identifier is not inverted in this
1866 * case. Hence the resulting interface identifier has local
1867 * scope according to RFC2373.
1868 */
1869 if (dev->dev_id) {
1870 eui[3] = (dev->dev_id >> 8) & 0xFF;
1871 eui[4] = dev->dev_id & 0xFF;
1872 } else {
1873 eui[3] = 0xFF;
1874 eui[4] = 0xFE;
1875 eui[0] ^= 2;
1876 }
1877 return 0;
1878}
1879
06a4c1c5 1880static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1881{
1882 if (dev->addr_len != IEEE802154_ADDR_LEN)
1883 return -1;
1884 memcpy(eui, dev->dev_addr, 8);
5e98a36e 1885 eui[0] ^= 2;
06a4c1c5 1886 return 0;
1887}
1888
cb6bf355
YH		 1889static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1890{
1891 union fwnet_hwaddr *ha;
1892
1893 if (dev->addr_len != FWNET_ALEN)
1894 return -1;
1895
1896 ha = (union fwnet_hwaddr *)dev->dev_addr;
1897
1898 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1899 eui[0] ^= 2;
1900 return 0;
1901}
1902
073a8e0e
YH		 1903static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1904{
1905 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1906 if (dev->addr_len != ARCNET_ALEN)
1907 return -1;
1908 memset(eui, 0, 7);
8e5e8f30 1909 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1910 return 0;
1911}
1912
1913static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1914{
1915 if (dev->addr_len != INFINIBAND_ALEN)
1916 return -1;
1917 memcpy(eui, dev->dev_addr + 12, 8);
1918 eui[0] |= 2;
1919 return 0;
1920}
1921
c61393ea 1922static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1923{
9af28511
SH		 1924 if (addr == 0)
1925 return -1;
dfd982ba
YH		 1926 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1927 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1928 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1929 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1930 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1931 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1932 eui[1] = 0;
1933 eui[2] = 0x5E;
1934 eui[3] = 0xFE;
1935 memcpy(eui + 4, &addr, 4);
1936 return 0;
1937}
dfd982ba
YH		 1938
1939static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1940{
1941 if (dev->priv_flags & IFF_ISATAP)
1942 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1943 return -1;
1944}
1945
aee80b54 1946static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1947{
1948 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1949}
1950
e837735e
ND		 1951static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1952{
1953 memcpy(eui, dev->perm_addr, 3);
1954 memcpy(eui + 5, dev->perm_addr + 3, 3);
1955 eui[3] = 0xFF;
1956 eui[4] = 0xFE;
1957 eui[0] ^= 2;
1958 return 0;
1959}
1960
1da177e4
LT		 1961static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1962{
1963 switch (dev->type) {
1964 case ARPHRD_ETHER:
1965 case ARPHRD_FDDI:
073a8e0e 1966 return addrconf_ifid_eui48(eui, dev);
1da177e4 1967 case ARPHRD_ARCNET:
073a8e0e 1968 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1969 case ARPHRD_INFINIBAND:
073a8e0e 1970 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1971 case ARPHRD_SIT:
dfd982ba 1972 return addrconf_ifid_sit(eui, dev);
aee80b54 1973 case ARPHRD_IPGRE:
1974 return addrconf_ifid_gre(eui, dev);
e74bccb8 1975 case ARPHRD_6LOWPAN:
06a4c1c5 1976 case ARPHRD_IEEE802154:
1977 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 1978 case ARPHRD_IEEE1394:
1979 return addrconf_ifid_ieee1394(eui, dev);
e837735e
ND		 1980 case ARPHRD_TUNNEL6:
1981 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 1982 }
1983 return -1;
1984}
1985
1986static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1987{
1988 int err = -1;
1989 struct inet6_ifaddr *ifp;
1990
1991 read_lock_bh(&idev->lock);
602582ca
HFS		 1992 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1993 if (ifp->scope > IFA_LINK)
1994 break;
1da177e4
LT		 1995 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1996 memcpy(eui, ifp->addr.s6_addr+8, 8);
1997 err = 0;
1998 break;
1999 }
2000 }
2001 read_unlock_bh(&idev->lock);
2002 return err;
2003}
2004
1da177e4 2005/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 2006static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2007{
1da177e4 2008regen:
955189ef 2009 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2010 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2011
2012 /*
2013 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2014 * check if generated address is not inappropriate
2015 *
2016 * - Reserved subnet anycast (RFC 2526)
2017 * 11111101 11....11 1xxxxxxx
c7dc89c0 2018 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2019 * 00-00-5E-FE-xx-xx-xx-xx
2020 * - value 0
2021 * - XXX: already assigned to an address on the device
2022 */
1ab1457c 2023 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2024 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2025 (idev->rndid[7]&0x80))
2026 goto regen;
2027 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2028 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2029 goto regen;
2030 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2031 goto regen;
2032 }
1da177e4
LT		 2033}
2034
2035static void ipv6_regen_rndid(unsigned long data)
2036{
2037 struct inet6_dev *idev = (struct inet6_dev *) data;
2038 unsigned long expires;
2039
8814c4b5 2040 rcu_read_lock_bh();
1da177e4
LT		 2041 write_lock_bh(&idev->lock);
2042
2043 if (idev->dead)
2044 goto out;
2045
eb7e0575 2046 __ipv6_regen_rndid(idev);
1ab1457c 2047
1da177e4 2048 expires = jiffies +
1ab1457c 2049 idev->cnf.temp_prefered_lft * HZ -
1f9248e5
JP		 2050 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2051 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
784e2710 2052 idev->cnf.max_desync_factor * HZ;
1da177e4 2053 if (time_before(expires, jiffies)) {
f3213831
JP		 2054 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2055 __func__, idev->dev->name);
1da177e4
LT		 2056 goto out;
2057 }
2058
2059 if (!mod_timer(&idev->regen_timer, expires))
2060 in6_dev_hold(idev);
2061
2062out:
2063 write_unlock_bh(&idev->lock);
8814c4b5 2064 rcu_read_unlock_bh();
1da177e4
LT		 2065 in6_dev_put(idev);
2066}
2067
eb7e0575 2068static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2069{
1da177e4 2070 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 2071 __ipv6_regen_rndid(idev);
1da177e4 2072}
1da177e4
LT		 2073
2074/*
2075 * Add prefix route.
2076 */
2077
2078static void
2079addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2080 unsigned long expires, u32 flags)
1da177e4 2081{
86872cb5
TG		 2082 struct fib6_config cfg = {
2083 .fc_table = RT6_TABLE_PREFIX,
2084 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2085 .fc_ifindex = dev->ifindex,
2086 .fc_expires = expires,
2087 .fc_dst_len = plen,
2088 .fc_flags = RTF_UP | flags,
c346dca1 2089 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2090 .fc_protocol = RTPROT_KERNEL,
86872cb5 2091 };
1da177e4 2092
4e3fd7a0 2093 cfg.fc_dst = *pfx;
1da177e4
LT		 2094
2095 /* Prevent useless cloning on PtP SIT.
2096 This thing is done here expecting that the whole
2097 class of non-broadcast devices need not cloning.
2098 */
07a93626 2099#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2100 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2101 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2102#endif
1da177e4 2103
86872cb5 2104 ip6_route_add(&cfg);
1da177e4
LT		 2105}
2106
14ef37b6
AH		 2107
2108static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2109 int plen,
2110 const struct net_device *dev,
2111 u32 flags, u32 noflags)
2112{
2113 struct fib6_node *fn;
2114 struct rt6_info *rt = NULL;
2115 struct fib6_table *table;
2116
2117 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
2118 if (table == NULL)
2119 return NULL;
2120
5744dd9b 2121 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2122 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2123 if (!fn)
2124 goto out;
2125 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2126 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2127 continue;
2128 if ((rt->rt6i_flags & flags) != flags)
2129 continue;
85da53bf 2130 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2131 continue;
2132 dst_hold(&rt->dst);
2133 break;
2134 }
2135out:
5744dd9b 2136 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2137 return rt;
2138}
2139
2140
1da177e4
LT		 2141/* Create "default" multicast route to the interface */
2142
2143static void addrconf_add_mroute(struct net_device *dev)
2144{
86872cb5
TG		 2145 struct fib6_config cfg = {
2146 .fc_table = RT6_TABLE_LOCAL,
2147 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2148 .fc_ifindex = dev->ifindex,
2149 .fc_dst_len = 8,
2150 .fc_flags = RTF_UP,
c346dca1 2151 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2152 };
2153
2154 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2155
2156 ip6_route_add(&cfg);
1da177e4
LT		 2157}
2158
1da177e4
LT		 2159static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2160{
2161 struct inet6_dev *idev;
2162
2163 ASSERT_RTNL();
2164
e21e8467
SH		 2165 idev = ipv6_find_idev(dev);
2166 if (!idev)
64e724f6
BH		 2167 return ERR_PTR(-ENOBUFS);
2168
2169 if (idev->cnf.disable_ipv6)
2170 return ERR_PTR(-EACCES);
1da177e4
LT		 2171
2172 /* Add default multicast route */
4af04aba
LW		 2173 if (!(dev->flags & IFF_LOOPBACK))
2174 addrconf_add_mroute(dev);
1da177e4 2175
1da177e4
LT		 2176 return idev;
2177}
2178
53bd6749
JP		 2179static void manage_tempaddrs(struct inet6_dev *idev,
2180 struct inet6_ifaddr *ifp,
2181 __u32 valid_lft, __u32 prefered_lft,
2182 bool create, unsigned long now)
2183{
2184 u32 flags;
2185 struct inet6_ifaddr *ift;
2186
2187 read_lock_bh(&idev->lock);
2188 /* update all temporary addresses in the list */
2189 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2190 int age, max_valid, max_prefered;
2191
2192 if (ifp != ift->ifpub)
2193 continue;
2194
2195 /* RFC 4941 section 3.3:
2196 * If a received option will extend the lifetime of a public
2197 * address, the lifetimes of temporary addresses should
2198 * be extended, subject to the overall constraint that no
2199 * temporary addresses should ever remain "valid" or "preferred"
2200 * for a time longer than (TEMP_VALID_LIFETIME) or
2201 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2202 */
2203 age = (now - ift->cstamp) / HZ;
2204 max_valid = idev->cnf.temp_valid_lft - age;
2205 if (max_valid < 0)
2206 max_valid = 0;
2207
2208 max_prefered = idev->cnf.temp_prefered_lft -
2209 idev->cnf.max_desync_factor - age;
2210 if (max_prefered < 0)
2211 max_prefered = 0;
2212
2213 if (valid_lft > max_valid)
2214 valid_lft = max_valid;
2215
2216 if (prefered_lft > max_prefered)
2217 prefered_lft = max_prefered;
2218
2219 spin_lock(&ift->lock);
2220 flags = ift->flags;
2221 ift->valid_lft = valid_lft;
2222 ift->prefered_lft = prefered_lft;
2223 ift->tstamp = now;
2224 if (prefered_lft > 0)
2225 ift->flags &= ~IFA_F_DEPRECATED;
2226
2227 spin_unlock(&ift->lock);
2228 if (!(flags&IFA_F_TENTATIVE))
2229 ipv6_ifa_notify(0, ift);
2230 }
2231
2232 if ((create || list_empty(&idev->tempaddr_list)) &&
2233 idev->cnf.use_tempaddr > 0) {
2234 /* When a new public address is created as described
2235 * in [ADDRCONF], also create a new temporary address.
2236 * Also create a temporary address if it's enabled but
2237 * no temporary address currently exists.
2238 */
2239 read_unlock_bh(&idev->lock);
2240 ipv6_create_tempaddr(ifp, NULL);
2241 } else {
2242 read_unlock_bh(&idev->lock);
2243 }
2244}
2245
e6bff995 2246void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2247{
2248 struct prefix_info *pinfo;
2249 __u32 valid_lft;
2250 __u32 prefered_lft;
2251 int addr_type;
64236f3f 2252 u32 addr_flags = 0;
1da177e4 2253 struct inet6_dev *in6_dev;
56d417b1 2254 struct net *net = dev_net(dev);
1da177e4
LT		 2255
2256 pinfo = (struct prefix_info *) opt;
1ab1457c 2257
1da177e4 2258 if (len < sizeof(struct prefix_info)) {
ba3542e1 2259 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2260 return;
2261 }
1ab1457c 2262
1da177e4
LT		 2263 /*
2264 * Validation checks ([ADDRCONF], page 19)
2265 */
2266
2267 addr_type = ipv6_addr_type(&pinfo->prefix);
2268
2269 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2270 return;
2271
2272 valid_lft = ntohl(pinfo->valid);
2273 prefered_lft = ntohl(pinfo->prefered);
2274
2275 if (prefered_lft > valid_lft) {
e87cc472 2276 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2277 return;
2278 }
2279
2280 in6_dev = in6_dev_get(dev);
2281
2282 if (in6_dev == NULL) {
e87cc472
JP		 2283 net_dbg_ratelimited("addrconf: device %s not configured\n",
2284 dev->name);
1da177e4
LT		 2285 return;
2286 }
2287
2288 /*
2289 * Two things going on here:
2290 * 1) Add routes for on-link prefixes
2291 * 2) Configure prefixes with the auto flag set
2292 */
2293
4bed72e4
YH		 2294 if (pinfo->onlink) {
2295 struct rt6_info *rt;
2296 unsigned long rt_expires;
2297
6f704992
YH		 2298 /* Avoid arithmetic overflow. Really, we could
2299 * save rt_expires in seconds, likely valid_lft,
2300 * but it would require division in fib gc, that it
2301 * not good.
2302 */
4bed72e4
YH		 2303 if (HZ > USER_HZ)
2304 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2305 else
2306 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2307
4bed72e4
YH		 2308 if (addrconf_finite_timeout(rt_expires))
2309 rt_expires *= HZ;
1da177e4 2310
14ef37b6
AH		 2311 rt = addrconf_get_prefix_route(&pinfo->prefix,
2312 pinfo->prefix_len,
2313 dev,
2314 RTF_ADDRCONF | RTF_PREFIX_RT,
2315 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2316
14ef37b6 2317 if (rt) {
6f704992
YH		 2318 /* Autoconf prefix route */
2319 if (valid_lft == 0) {
2320 ip6_del_rt(rt);
2321 rt = NULL;
4bed72e4 2322 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2323 /* not infinity */
1716a961 2324 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2325 } else {
1716a961 2326 rt6_clean_expires(rt);
1da177e4
LT		 2327 }
2328 } else if (valid_lft) {
6f704992 2329 clock_t expires = 0;
4bed72e4
YH		 2330 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2331 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2332 /* not infinity */
2333 flags |= RTF_EXPIRES;
2334 expires = jiffies_to_clock_t(rt_expires);
2335 }
1da177e4 2336 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2337 dev, expires, flags);
1da177e4 2338 }
94e187c0 2339 ip6_rt_put(rt);
1da177e4
LT		 2340 }
2341
2342 /* Try to figure out our local address for this prefix */
2343
2344 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2345 struct inet6_ifaddr *ifp;
1da177e4
LT		 2346 struct in6_addr addr;
2347 int create = 0, update_lft = 0;
617fe29d 2348 bool tokenized = false;
1da177e4
LT		 2349
2350 if (pinfo->prefix_len == 64) {
2351 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2352
2353 if (!ipv6_addr_any(&in6_dev->token)) {
2354 read_lock_bh(&in6_dev->lock);
2355 memcpy(addr.s6_addr + 8,
2356 in6_dev->token.s6_addr + 8, 8);
2357 read_unlock_bh(&in6_dev->lock);
617fe29d 2358 tokenized = true;
622c81d5
HFS		 2359 } else if (in6_dev->addr_gen_mode ==
2360 IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
2361 !ipv6_generate_stable_address(&addr, 0,
2362 in6_dev)) {
64236f3f 2363 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2364 goto ok;
f53adae4
DB		 2365 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2366 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1da177e4
LT		 2367 in6_dev_put(in6_dev);
2368 return;
2369 }
2370 goto ok;
2371 }
e87cc472
JP		 2372 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2373 pinfo->prefix_len);
1da177e4
LT		 2374 in6_dev_put(in6_dev);
2375 return;
2376
2377ok:
2378
53b7997f 2379 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 2380
2381 if (ifp == NULL && valid_lft) {
2382 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2383
2384#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2385 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2386 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 2387 addr_flags = IFA_F_OPTIMISTIC;
2388#endif
1da177e4
LT		 2389
2390 /* Do not allow to create too much of autoconfigured
2391 * addresses; this would be too easy way to crash kernel.
2392 */
2393 if (!max_addresses ||
2394 ipv6_count_addresses(in6_dev) < max_addresses)
3f8f5298
JP		 2395 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2396 pinfo->prefix_len,
95c385b4 2397 addr_type&IPV6_ADDR_SCOPE_MASK,
8a226b2c
JB		 2398 addr_flags, valid_lft,
2399 prefered_lft);
1da177e4 2400
3f0d2ba0 2401 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2402 in6_dev_put(in6_dev);
2403 return;
2404 }
2405
8a226b2c
JB		 2406 update_lft = 0;
2407 create = 1;
c15b1cca
HFS		 2408 spin_lock_bh(&ifp->lock);
2409 ifp->flags |= IFA_F_MANAGETEMPADDR;
1da177e4 2410 ifp->cstamp = jiffies;
617fe29d 2411 ifp->tokenized = tokenized;
c15b1cca 2412 spin_unlock_bh(&ifp->lock);
cf22f9a2 2413 addrconf_dad_start(ifp);
1da177e4
LT		 2414 }
2415
2416 if (ifp) {
479840ff 2417 u32 flags;
1da177e4 2418 unsigned long now;
1da177e4
LT		 2419 u32 stored_lft;
2420
2421 /* update lifetime (RFC2462 5.5.3 e) */
8e8e676d 2422 spin_lock_bh(&ifp->lock);
1da177e4
LT		 2423 now = jiffies;
2424 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2425 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2426 else
2427 stored_lft = 0;
8a226b2c 2428 if (!update_lft && !create && stored_lft) {
9451a304
FF		 2429 const u32 minimum_lft = min_t(u32,
2430 stored_lft, MIN_VALID_LIFETIME);
c9d55d5b
PM		 2431 valid_lft = max(valid_lft, minimum_lft);
2432
2433 /* RFC4862 Section 5.5.3e:
2434 * "Note that the preferred lifetime of the
2435 * corresponding address is always reset to
2436 * the Preferred Lifetime in the received
2437 * Prefix Information option, regardless of
2438 * whether the valid lifetime is also reset or
2439 * ignored."
2440 *
2441 * So we should always update prefered_lft here.
2442 */
2443 update_lft = 1;
1da177e4
LT		 2444 }
2445
2446 if (update_lft) {
2447 ifp->valid_lft = valid_lft;
2448 ifp->prefered_lft = prefered_lft;
2449 ifp->tstamp = now;
2450 flags = ifp->flags;
2451 ifp->flags &= ~IFA_F_DEPRECATED;
8e8e676d 2452 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2453
2454 if (!(flags&IFA_F_TENTATIVE))
2455 ipv6_ifa_notify(0, ifp);
2456 } else
8e8e676d 2457 spin_unlock_bh(&ifp->lock);
1da177e4 2458
53bd6749
JP		 2459 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2460 create, now);
5d9efa7e 2461
1da177e4 2462 in6_ifa_put(ifp);
c15b1cca 2463 addrconf_verify();
1da177e4
LT		 2464 }
2465 }
2466 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2467 in6_dev_put(in6_dev);
2468}
2469
2470/*
2471 * Set destination address.
2472 * Special case for SIT interfaces where we create a new "virtual"
2473 * device.
2474 */
af284937 2475int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2476{
2477 struct in6_ifreq ireq;
2478 struct net_device *dev;
2479 int err = -EINVAL;
2480
2481 rtnl_lock();
2482
2483 err = -EFAULT;
2484 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2485 goto err_exit;
2486
af284937 2487 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2488
2489 err = -ENODEV;
2490 if (dev == NULL)
2491 goto err_exit;
2492
07a93626 2493#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2494 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2495 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2496 struct ifreq ifr;
1da177e4
LT		 2497 struct ip_tunnel_parm p;
2498
2499 err = -EADDRNOTAVAIL;
2500 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2501 goto err_exit;
2502
2503 memset(&p, 0, sizeof(p));
2504 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2505 p.iph.saddr = 0;
2506 p.iph.version = 4;
2507 p.iph.ihl = 5;
2508 p.iph.protocol = IPPROTO_IPV6;
2509 p.iph.ttl = 64;
d20b3109 2510 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2511
5bc3eb7e
SH		 2512 if (ops->ndo_do_ioctl) {
2513 mm_segment_t oldfs = get_fs();
2514
2515 set_fs(KERNEL_DS);
2516 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2517 set_fs(oldfs);
2518 } else
2519 err = -EOPNOTSUPP;
1da177e4
LT		 2520
2521 if (err == 0) {
2522 err = -ENOBUFS;
af284937
DL		 2523 dev = __dev_get_by_name(net, p.name);
2524 if (!dev)
1da177e4
LT		 2525 goto err_exit;
2526 err = dev_open(dev);
2527 }
2528 }
0be669bb 2529#endif
1da177e4
LT		 2530
2531err_exit:
2532 rtnl_unlock();
2533 return err;
2534}
2535
93a714d6
MC		 2536static int ipv6_mc_config(struct sock *sk, bool join,
2537 const struct in6_addr *addr, int ifindex)
2538{
2539 int ret;
2540
2541 ASSERT_RTNL();
2542
2543 lock_sock(sk);
2544 if (join)
54ff9ef3 2545 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2546 else
54ff9ef3 2547 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2548 release_sock(sk);
2549
2550 return ret;
2551}
2552
1da177e4
LT		 2553/*
2554 * Manual configuration of address on an interface
2555 */
479840ff
JP		 2556static int inet6_addr_add(struct net *net, int ifindex,
2557 const struct in6_addr *pfx,
caeaba79 2558 const struct in6_addr *peer_pfx,
479840ff
JP		 2559 unsigned int plen, __u32 ifa_flags,
2560 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2561{
2562 struct inet6_ifaddr *ifp;
2563 struct inet6_dev *idev;
2564 struct net_device *dev;
93a714d6
MC		 2565 unsigned long timeout;
2566 clock_t expires;
1da177e4 2567 int scope;
6f704992 2568 u32 flags;
1da177e4
LT		 2569
2570 ASSERT_RTNL();
1ab1457c 2571
24ef0da7
TG		 2572 if (plen > 128)
2573 return -EINVAL;
2574
0778769d
NT		 2575 /* check the lifetime */
2576 if (!valid_lft || prefered_lft > valid_lft)
2577 return -EINVAL;
2578
53bd6749
JP		 2579 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2580 return -EINVAL;
2581
af284937
DL		 2582 dev = __dev_get_by_index(net, ifindex);
2583 if (!dev)
1da177e4 2584 return -ENODEV;
1ab1457c 2585
64e724f6
BH		 2586 idev = addrconf_add_dev(dev);
2587 if (IS_ERR(idev))
2588 return PTR_ERR(idev);
1da177e4 2589
93a714d6
MC		 2590 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2591 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2592 true, pfx, ifindex);
2593
2594 if (ret < 0)
2595 return ret;
2596 }
2597
1da177e4
LT		 2598 scope = ipv6_addr_scope(pfx);
2599
4bed72e4
YH		 2600 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2601 if (addrconf_finite_timeout(timeout)) {
2602 expires = jiffies_to_clock_t(timeout * HZ);
2603 valid_lft = timeout;
6f704992 2604 flags = RTF_EXPIRES;
4bed72e4
YH		 2605 } else {
2606 expires = 0;
2607 flags = 0;
2608 ifa_flags |= IFA_F_PERMANENT;
6f704992 2609 }
0778769d 2610
4bed72e4
YH		 2611 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2612 if (addrconf_finite_timeout(timeout)) {
2613 if (timeout == 0)
2614 ifa_flags |= IFA_F_DEPRECATED;
2615 prefered_lft = timeout;
2616 }
0778769d 2617
8a226b2c
JB		 2618 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2619 valid_lft, prefered_lft);
0778769d 2620
1da177e4 2621 if (!IS_ERR(ifp)) {
761aac73
TH		 2622 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2623 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2624 expires, flags);
2625 }
2626
95c385b4
NH		 2627 /*
2628 * Note that section 3.1 of RFC 4429 indicates
2629 * that the Optimistic flag should not be set for
2630 * manually configured addresses
2631 */
cf22f9a2 2632 addrconf_dad_start(ifp);
53bd6749
JP		 2633 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2634 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2635 true, jiffies);
1da177e4 2636 in6_ifa_put(ifp);
c15b1cca 2637 addrconf_verify_rtnl();
1da177e4 2638 return 0;
93a714d6
MC		 2639 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2640 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2641 false, pfx, ifindex);
1da177e4
LT		 2642 }
2643
2644 return PTR_ERR(ifp);
2645}
2646
6046d5b4
HK		 2647static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2648 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2649{
2650 struct inet6_ifaddr *ifp;
2651 struct inet6_dev *idev;
2652 struct net_device *dev;
1ab1457c 2653
24ef0da7
TG		 2654 if (plen > 128)
2655 return -EINVAL;
2656
af284937
DL		 2657 dev = __dev_get_by_index(net, ifindex);
2658 if (!dev)
1da177e4
LT		 2659 return -ENODEV;
2660
e5d08d71
IM		 2661 idev = __in6_dev_get(dev);
2662 if (idev == NULL)
1da177e4
LT		 2663 return -ENXIO;
2664
2665 read_lock_bh(&idev->lock);
502a2ffd 2666 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2667 if (ifp->prefix_len == plen &&
2668 ipv6_addr_equal(pfx, &ifp->addr)) {
2669 in6_ifa_hold(ifp);
2670 read_unlock_bh(&idev->lock);
1ab1457c 2671
6046d5b4
HK		 2672 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2673 (ifa_flags & IFA_F_MANAGETEMPADDR))
2674 manage_tempaddrs(idev, ifp, 0, 0, false,
2675 jiffies);
1da177e4 2676 ipv6_del_addr(ifp);
6046d5b4 2677 addrconf_verify_rtnl();
93a714d6
MC		 2678 if (ipv6_addr_is_multicast(pfx)) {
2679 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2680 false, pfx, dev->ifindex);
2681 }
1da177e4
LT		 2682 return 0;
2683 }
2684 }
2685 read_unlock_bh(&idev->lock);
2686 return -EADDRNOTAVAIL;
2687}
2688
2689
af284937 2690int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2691{
2692 struct in6_ifreq ireq;
2693 int err;
1ab1457c 2694
af31f412 2695 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2696 return -EPERM;
1ab1457c 2697
1da177e4
LT		 2698 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2699 return -EFAULT;
2700
2701 rtnl_lock();
caeaba79 2702 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2703 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2704 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2705 rtnl_unlock();
2706 return err;
2707}
2708
af284937 2709int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2710{
2711 struct in6_ifreq ireq;
2712 int err;
1ab1457c 2713
af31f412 2714 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2715 return -EPERM;
2716
2717 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2718 return -EFAULT;
2719
2720 rtnl_lock();
6046d5b4 2721 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2722 ireq.ifr6_prefixlen);
1da177e4
LT		 2723 rtnl_unlock();
2724 return err;
2725}
2726
b5f348e5
IJ		 2727static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2728 int plen, int scope)
2729{
2730 struct inet6_ifaddr *ifp;
2731
8a226b2c 2732 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2733 scope, IFA_F_PERMANENT,
2734 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2735 if (!IS_ERR(ifp)) {
2736 spin_lock_bh(&ifp->lock);
2737 ifp->flags &= ~IFA_F_TENTATIVE;
2738 spin_unlock_bh(&ifp->lock);
2739 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2740 in6_ifa_put(ifp);
2741 }
2742}
2743
07a93626 2744#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2745static void sit_add_v4_addrs(struct inet6_dev *idev)
2746{
1da177e4
LT		 2747 struct in6_addr addr;
2748 struct net_device *dev;
c346dca1 2749 struct net *net = dev_net(idev->dev);
929c9cf3 2750 int scope, plen;
f0e2acfa 2751 u32 pflags = 0;
1da177e4
LT		 2752
2753 ASSERT_RTNL();
2754
2755 memset(&addr, 0, sizeof(struct in6_addr));
2756 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2757
2758 if (idev->dev->flags&IFF_POINTOPOINT) {
2759 addr.s6_addr32[0] = htonl(0xfe800000);
2760 scope = IFA_LINK;
929c9cf3 2761 plen = 64;
1da177e4
LT		 2762 } else {
2763 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2764 plen = 96;
f0e2acfa 2765 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2766 }
2767
2768 if (addr.s6_addr32[3]) {
929c9cf3 2769 add_addr(idev, &addr, plen, scope);
f0e2acfa 2770 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2771 return;
2772 }
2773
6fda7350 2774 for_each_netdev(net, dev) {
8e5e8f30 2775 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2776 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2777 struct in_ifaddr *ifa;
1da177e4
LT		 2778
2779 int flag = scope;
2780
2781 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2782
2783 addr.s6_addr32[3] = ifa->ifa_local;
2784
2785 if (ifa->ifa_scope == RT_SCOPE_LINK)
2786 continue;
2787 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2788 if (idev->dev->flags&IFF_POINTOPOINT)
2789 continue;
2790 flag |= IFA_HOST;
2791 }
1da177e4 2792
b5f348e5 2793 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2794 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2795 pflags);
1da177e4
LT		 2796 }
2797 }
1ab1457c 2798 }
1da177e4 2799}
0be669bb 2800#endif
1da177e4
LT		 2801
2802static void init_loopback(struct net_device *dev)
2803{
2804 struct inet6_dev *idev;
25fb6ca4
BK		 2805 struct net_device *sp_dev;
2806 struct inet6_ifaddr *sp_ifa;
2807 struct rt6_info *sp_rt;
1da177e4
LT		 2808
2809 /* ::1 */
2810
2811 ASSERT_RTNL();
2812
e5d08d71
IM		 2813 idev = ipv6_find_idev(dev);
2814 if (idev == NULL) {
91df42be 2815 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2816 return;
2817 }
2818
b5f348e5 2819 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2820
2821 /* Add routes to other interface's IPv6 addresses */
2822 for_each_netdev(dev_net(dev), sp_dev) {
2823 if (!strcmp(sp_dev->name, dev->name))
2824 continue;
2825
2826 idev = __in6_dev_get(sp_dev);
2827 if (!idev)
2828 continue;
2829
2830 read_lock_bh(&idev->lock);
2831 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2832
2833 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2834 continue;
2835
33d99113
G		 2836 if (sp_ifa->rt) {
2837 /* This dst has been added to garbage list when
2838 * lo device down, release this obsolete dst and
2839 * reallocate a new router for ifa.
2840 */
2841 if (sp_ifa->rt->dst.obsolete > 0) {
2842 ip6_rt_put(sp_ifa->rt);
2843 sp_ifa->rt = NULL;
2844 } else {
2845 continue;
2846 }
2847 }
a881ae1f 2848
57ec0afe 2849 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 2850
2851 /* Failure cases are ignored */
534c8779
G		 2852 if (!IS_ERR(sp_rt)) {
2853 sp_ifa->rt = sp_rt;
25fb6ca4 2854 ip6_ins_rt(sp_rt);
534c8779 2855 }
25fb6ca4
BK		 2856 }
2857 read_unlock_bh(&idev->lock);
2858 }
1da177e4
LT		 2859}
2860
64236f3f
HFS		 2861static void addrconf_add_linklocal(struct inet6_dev *idev,
2862 const struct in6_addr *addr, u32 flags)
1da177e4 2863{
8e5e8f30 2864 struct inet6_ifaddr *ifp;
64236f3f 2865 u32 addr_flags = flags | IFA_F_PERMANENT;
95c385b4
NH		 2866
2867#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2868 if (idev->cnf.optimistic_dad &&
702beb87 2869 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2870 addr_flags |= IFA_F_OPTIMISTIC;
2871#endif
1da177e4 2872
07edd741
HFS		 2873 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2874 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 2875 if (!IS_ERR(ifp)) {
46d48046 2876 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2877 addrconf_dad_start(ifp);
1da177e4
LT		 2878 in6_ifa_put(ifp);
2879 }
2880}
2881
622c81d5
HFS		 2882static bool ipv6_reserved_interfaceid(struct in6_addr address)
2883{
2884 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2885 return true;
2886
2887 if (address.s6_addr32[2] == htonl(0x02005eff) &&
2888 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2889 return true;
2890
2891 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2892 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2893 return true;
2894
2895 return false;
2896}
2897
2898static int ipv6_generate_stable_address(struct in6_addr *address,
2899 u8 dad_count,
2900 const struct inet6_dev *idev)
2901{
2902 static const int idgen_retries = 3;
2903
2904 static DEFINE_SPINLOCK(lock);
2905 static __u32 digest[SHA_DIGEST_WORDS];
2906 static __u32 workspace[SHA_WORKSPACE_WORDS];
2907
2908 static union {
2909 char __data[SHA_MESSAGE_BYTES];
2910 struct {
2911 struct in6_addr secret;
2912 __be64 prefix;
2913 unsigned char hwaddr[MAX_ADDR_LEN];
2914 u8 dad_count;
2915 } __packed;
2916 } data;
2917
2918 struct in6_addr secret;
2919 struct in6_addr temp;
2920 struct net *net = dev_net(idev->dev);
2921
2922 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
2923
2924 if (idev->cnf.stable_secret.initialized)
2925 secret = idev->cnf.stable_secret.secret;
2926 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
2927 secret = net->ipv6.devconf_dflt->stable_secret.secret;
2928 else
2929 return -1;
2930
2931retry:
2932 spin_lock_bh(&lock);
2933
2934 sha_init(digest);
2935 memset(&data, 0, sizeof(data));
2936 memset(workspace, 0, sizeof(workspace));
2937 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
2938 data.prefix = ((__be64)address->s6_addr32[0] << 32) |
2939 (__be64)address->s6_addr32[1];
2940 data.secret = secret;
2941 data.dad_count = dad_count;
2942
2943 sha_transform(digest, data.__data, workspace);
2944
2945 temp = *address;
2946 temp.s6_addr32[2] = digest[0];
2947 temp.s6_addr32[3] = digest[1];
2948
2949 spin_unlock_bh(&lock);
2950
2951 if (ipv6_reserved_interfaceid(temp)) {
2952 dad_count++;
2953 if (dad_count > idgen_retries)
2954 return -1;
2955 goto retry;
2956 }
2957
2958 *address = temp;
2959 return 0;
2960}
2961
bc91b0f0
JP		 2962static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
2963{
622c81d5
HFS		 2964 struct in6_addr addr;
2965
2966 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 2967
622c81d5
HFS		 2968 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
2969 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 2970 addrconf_add_linklocal(idev, &addr,
2971 IFA_F_STABLE_PRIVACY);
622c81d5
HFS		 2972 else if (prefix_route)
2973 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
2974 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
bc91b0f0
JP		 2975 /* addrconf_add_linklocal also adds a prefix_route and we
2976 * only need to care about prefix routes if ipv6_generate_eui64
2977 * couldn't generate one.
2978 */
2979 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 2980 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0
JP		 2981 else if (prefix_route)
2982 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
2983 }
2984}
2985
1da177e4
LT		 2986static void addrconf_dev_config(struct net_device *dev)
2987{
8e5e8f30 2988 struct inet6_dev *idev;
1da177e4
LT		 2989
2990 ASSERT_RTNL();
2991
74235a25
HX		 2992 if ((dev->type != ARPHRD_ETHER) &&
2993 (dev->type != ARPHRD_FDDI) &&
74235a25 2994 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 2995 (dev->type != ARPHRD_INFINIBAND) &&
cb6bf355 2996 (dev->type != ARPHRD_IEEE802154) &&
e837735e 2997 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8
JR		 2998 (dev->type != ARPHRD_TUNNEL6) &&
2999 (dev->type != ARPHRD_6LOWPAN)) {
74235a25
HX		 3000 /* Alas, we support only Ethernet autoconfiguration. */
3001 return;
3002 }
3003
1da177e4 3004 idev = addrconf_add_dev(dev);
64e724f6 3005 if (IS_ERR(idev))
1da177e4
LT		 3006 return;
3007
bc91b0f0 3008 addrconf_addr_gen(idev, false);
1da177e4
LT		 3009}
3010
07a93626 3011#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3012static void addrconf_sit_config(struct net_device *dev)
3013{
3014 struct inet6_dev *idev;
3015
3016 ASSERT_RTNL();
3017
1ab1457c
YH		 3018 /*
3019 * Configure the tunnel with one of our IPv4
3020 * addresses... we should configure all of
1da177e4
LT		 3021 * our v4 addrs in the tunnel
3022 */
3023
e5d08d71
IM		 3024 idev = ipv6_find_idev(dev);
3025 if (idev == NULL) {
91df42be 3026 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3027 return;
3028 }
3029
c7dc89c0 3030 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3031 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3032 return;
3033 }
3034
1da177e4
LT		 3035 sit_add_v4_addrs(idev);
3036
62b54dd9 3037 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3038 addrconf_add_mroute(dev);
1da177e4 3039}
0be669bb 3040#endif
1da177e4 3041
07a93626 3042#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3043static void addrconf_gre_config(struct net_device *dev)
3044{
3045 struct inet6_dev *idev;
aee80b54 3046
aee80b54 3047 ASSERT_RTNL();
3048
e5d08d71
IM		 3049 idev = ipv6_find_idev(dev);
3050 if (idev == NULL) {
91df42be 3051 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3052 return;
3053 }
3054
bc91b0f0 3055 addrconf_addr_gen(idev, true);
aee80b54 3056}
3057#endif
3058
1ab1457c 3059static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3060 void *ptr)
1da177e4 3061{
351638e7 3062 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 3063 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 3064 int run_pending = 0;
b217d616 3065 int err;
1da177e4 3066
e21e8467 3067 switch (event) {
45ba9dd2 3068 case NETDEV_REGISTER:
74235a25 3069 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3070 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3071 if (IS_ERR(idev))
3072 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3073 }
3074 break;
bcdd553f 3075
1da177e4 3076 case NETDEV_UP:
3c21edbd 3077 case NETDEV_CHANGE:
c2edacf8
JV		 3078 if (dev->flags & IFF_SLAVE)
3079 break;
3080
3ce62a84
WC		 3081 if (idev && idev->cnf.disable_ipv6)
3082 break;
3083
3c21edbd 3084 if (event == NETDEV_UP) {
f24e3d65 3085 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 3086 /* device is not ready yet. */
f3213831 3087 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3088 dev->name);
3089 break;
3090 }
99081049 3091
d31c7b8f
EP		 3092 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3093 idev = ipv6_add_dev(dev);
3094
a317a2f1 3095 if (!IS_ERR_OR_NULL(idev)) {
99081049 3096 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3097 run_pending = 1;
3098 }
3c21edbd 3099 } else {
f24e3d65 3100 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 3101 /* device is still not ready. */
3102 break;
3103 }
3104
3105 if (idev) {
bcdd553f 3106 if (idev->if_flags & IF_READY)
3c21edbd
YH		 3107 /* device is already configured. */
3108 break;
3c21edbd
YH		 3109 idev->if_flags |= IF_READY;
3110 }
3111
f3213831
JP		 3112 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3113 dev->name);
3c21edbd 3114
c5e33bdd 3115 run_pending = 1;
3c21edbd
YH		 3116 }
3117
e21e8467 3118 switch (dev->type) {
07a93626 3119#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3120 case ARPHRD_SIT:
3121 addrconf_sit_config(dev);
3122 break;
aee80b54 3123#endif
07a93626 3124#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3125 case ARPHRD_IPGRE:
3126 addrconf_gre_config(dev);
3127 break;
0be669bb 3128#endif
1da177e4
LT		 3129 case ARPHRD_LOOPBACK:
3130 init_loopback(dev);
3131 break;
3132
3133 default:
3134 addrconf_dev_config(dev);
3135 break;
3ff50b79 3136 }
bcdd553f 3137
a317a2f1 3138 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3139 if (run_pending)
3140 addrconf_dad_run(idev);
3141
bcdd553f
SH		 3142 /*
3143 * If the MTU changed during the interface down,
3144 * when the interface up, the changed MTU must be
3145 * reflected in the idev as well as routers.
1da177e4 3146 */
bcdd553f
SH		 3147 if (idev->cnf.mtu6 != dev->mtu &&
3148 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3149 rt6_mtu_change(dev, dev->mtu);
3150 idev->cnf.mtu6 = dev->mtu;
3151 }
3152 idev->tstamp = jiffies;
3153 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3154
3155 /*
3156 * If the changed mtu during down is lower than
3157 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3158 */
3159 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 3160 addrconf_ifdown(dev, 1);
1da177e4
LT		 3161 }
3162 break;
3163
3164 case NETDEV_CHANGEMTU:
d31c7b8f 3165 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3166 rt6_mtu_change(dev, dev->mtu);
3167 idev->cnf.mtu6 = dev->mtu;
3168 break;
3169 }
3170
d31c7b8f
EP		 3171 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3172 idev = ipv6_add_dev(dev);
a317a2f1 3173 if (!IS_ERR(idev))
d31c7b8f
EP		 3174 break;
3175 }
3176
bcdd553f 3177 /*
db9c7c39 3178 * if MTU under IPV6_MIN_MTU.
bcdd553f
SH		 3179 * Stop IPv6 on this interface.
3180 */
1da177e4
LT		 3181
3182 case NETDEV_DOWN:
3183 case NETDEV_UNREGISTER:
3184 /*
3185 * Remove all addresses from this interface.
3186 */
3187 addrconf_ifdown(dev, event != NETDEV_DOWN);
3188 break;
3c21edbd 3189
1da177e4 3190 case NETDEV_CHANGENAME:
1da177e4 3191 if (idev) {
5632c515 3192 snmp6_unregister_dev(idev);
408c4768 3193 addrconf_sysctl_unregister(idev);
a317a2f1 3194 err = addrconf_sysctl_register(idev);
b217d616
HX		 3195 if (err)
3196 return notifier_from_errno(err);
a317a2f1
WC		 3197 err = snmp6_register_dev(idev);
3198 if (err) {
3199 addrconf_sysctl_unregister(idev);
3200 return notifier_from_errno(err);
3201 }
5632c515 3202 }
1da177e4 3203 break;
bcdd553f 3204
93d9b7d7
JP		 3205 case NETDEV_PRE_TYPE_CHANGE:
3206 case NETDEV_POST_TYPE_CHANGE:
3207 addrconf_type_change(dev, event);
75c78500 3208 break;
3ff50b79 3209 }
1da177e4
LT		 3210
3211 return NOTIFY_OK;
3212}
3213
3214/*
3215 * addrconf module should be notified of a device going up
3216 */
3217static struct notifier_block ipv6_dev_notf = {
3218 .notifier_call = addrconf_notify,
1da177e4
LT		 3219};
3220
93d9b7d7 3221static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3222{
3223 struct inet6_dev *idev;
3224 ASSERT_RTNL();
3225
3226 idev = __in6_dev_get(dev);
3227
93d9b7d7 3228 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3229 ipv6_mc_remap(idev);
93d9b7d7 3230 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3231 ipv6_mc_unmap(idev);
3232}
3233
1da177e4
LT		 3234static int addrconf_ifdown(struct net_device *dev, int how)
3235{
c346dca1 3236 struct net *net = dev_net(dev);
502a2ffd 3237 struct inet6_dev *idev;
3238 struct inet6_ifaddr *ifa;
73a8bd74 3239 int state, i;
1da177e4
LT		 3240
3241 ASSERT_RTNL();
3242
73a8bd74
DM		 3243 rt6_ifdown(net, dev);
3244 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3245
3246 idev = __in6_dev_get(dev);
3247 if (idev == NULL)
3248 return -ENODEV;
3249
bcdd553f
SH		 3250 /*
3251 * Step 1: remove reference to ipv6 device from parent device.
3252 * Do not dev_put!
1da177e4 3253 */
439e2385 3254 if (how) {
1da177e4 3255 idev->dead = 1;
8814c4b5
YH		 3256
3257 /* protected by rtnl_lock */
a9b3cd7f 3258 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3259
3260 /* Step 1.5: remove snmp6 entry */
3261 snmp6_unregister_dev(idev);
3262
3263 }
3264
73a8bd74
DM		 3265 /* Step 2: clear hash table */
3266 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3267 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3268
3269 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3270restart:
b67bfe0d 3271 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74
DM		 3272 if (ifa->idev == idev) {
3273 hlist_del_init_rcu(&ifa->addr_lst);
c15b1cca 3274 addrconf_del_dad_work(ifa);
73a8bd74
DM		 3275 goto restart;
3276 }
3277 }
3278 spin_unlock_bh(&addrconf_hash_lock);
3279 }
3280
1da177e4
LT		 3281 write_lock_bh(&idev->lock);
3282
b7b1bfce
HFS		 3283 addrconf_del_rs_timer(idev);
3284
bcdd553f 3285 /* Step 2: clear flags for stateless addrconf */
439e2385 3286 if (!how)
3c21edbd 3287 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3288
439e2385 3289 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 3290 in6_dev_put(idev);
3291
bcdd553f 3292 /* Step 3: clear tempaddr list */
372e6c8f 3293 while (!list_empty(&idev->tempaddr_list)) {
3294 ifa = list_first_entry(&idev->tempaddr_list,
3295 struct inet6_ifaddr, tmp_list);
3296 list_del(&ifa->tmp_list);
1da177e4
LT		 3297 write_unlock_bh(&idev->lock);
3298 spin_lock_bh(&ifa->lock);
3299
3300 if (ifa->ifpub) {
3301 in6_ifa_put(ifa->ifpub);
3302 ifa->ifpub = NULL;
3303 }
3304 spin_unlock_bh(&ifa->lock);
3305 in6_ifa_put(ifa);
3306 write_lock_bh(&idev->lock);
3307 }
8f37ada5 3308
502a2ffd 3309 while (!list_empty(&idev->addr_list)) {
3310 ifa = list_first_entry(&idev->addr_list,
3311 struct inet6_ifaddr, if_list);
c15b1cca 3312 addrconf_del_dad_work(ifa);
84e8b803 3313
73a8bd74 3314 list_del(&ifa->if_list);
84e8b803 3315
73a8bd74 3316 write_unlock_bh(&idev->lock);
84e8b803 3317
8e8e676d 3318 spin_lock_bh(&ifa->lock);
73a8bd74
DM		 3319 state = ifa->state;
3320 ifa->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 3321 spin_unlock_bh(&ifa->lock);
9d82ca98 3322
73a8bd74
DM		 3323 if (state != INET6_IFADDR_STATE_DEAD) {
3324 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3325 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 3326 }
73a8bd74 3327 in6_ifa_put(ifa);
8f37ada5 3328
73a8bd74
DM		 3329 write_lock_bh(&idev->lock);
3330 }
8f37ada5 3331
1da177e4
LT		 3332 write_unlock_bh(&idev->lock);
3333
381f4dca
SD		 3334 /* Step 5: Discard anycast and multicast list */
3335 if (how) {
3336 ipv6_ac_destroy_dev(idev);
1da177e4 3337 ipv6_mc_destroy_dev(idev);
381f4dca 3338 } else {
1da177e4 3339 ipv6_mc_down(idev);
381f4dca 3340 }
1da177e4 3341
1da177e4 3342 idev->tstamp = jiffies;
1ab1457c 3343
bcdd553f 3344 /* Last: Shot the device (if unregistered) */
439e2385 3345 if (how) {
408c4768 3346 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3347 neigh_parms_release(&nd_tbl, idev->nd_parms);
3348 neigh_ifdown(&nd_tbl, dev);
3349 in6_dev_put(idev);
3350 }
3351 return 0;
3352}
3353
3354static void addrconf_rs_timer(unsigned long data)
3355{
b7b1bfce 3356 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3357 struct net_device *dev = idev->dev;
b7b1bfce 3358 struct in6_addr lladdr;
1da177e4 3359
b7b1bfce 3360 write_lock(&idev->lock);
5b2a1953 3361 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3362 goto out;
3363
9ba2add3 3364 if (!ipv6_accept_ra(idev))
5b2a1953 3365 goto out;
3366
3367 /* Announcement received after solicitation was sent */
3368 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3369 goto out;
1da177e4 3370
b7b1bfce 3371 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
caf92bc4
CW		 3372 write_unlock(&idev->lock);
3373 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3374 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3375 &in6addr_linklocal_allrouters);
3376 else
caf92bc4 3377 goto put;
1da177e4 3378
caf92bc4 3379 write_lock(&idev->lock);
b7b1bfce
HFS		 3380 /* The wait after the last probe can be shorter */
3381 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3382 idev->cnf.rtr_solicits) ?
3383 idev->cnf.rtr_solicit_delay :
3384 idev->cnf.rtr_solicit_interval);
1da177e4 3385 } else {
1da177e4
LT		 3386 /*
3387 * Note: we do not support deprecated "all on-link"
3388 * assumption any longer.
3389 */
91df42be 3390 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3391 }
3392
3393out:
b7b1bfce 3394 write_unlock(&idev->lock);
caf92bc4 3395put:
b7b1bfce 3396 in6_dev_put(idev);
1da177e4
LT		 3397}
3398
3399/*
3400 * Duplicate Address Detection
3401 */
3c21edbd
YH		 3402static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3403{
3404 unsigned long rand_num;
3405 struct inet6_dev *idev = ifp->idev;
3406
95c385b4
NH		 3407 if (ifp->flags & IFA_F_OPTIMISTIC)
3408 rand_num = 0;
3409 else
63862b5b 3410 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3411
b7b1bfce 3412 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3413 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3414}
3415
c15b1cca 3416static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3417{
3418 struct inet6_dev *idev = ifp->idev;
3419 struct net_device *dev = idev->dev;
1da177e4
LT		 3420
3421 addrconf_join_solict(dev, &ifp->addr);
3422
63862b5b 3423 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3424
3425 read_lock_bh(&idev->lock);
622ccdf1 3426 spin_lock(&ifp->lock);
e9d3e084 3427 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3428 goto out;
1da177e4
LT		 3429
3430 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3431 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3432 !(ifp->flags&IFA_F_TENTATIVE) ||
3433 ifp->flags & IFA_F_NODAD) {
cc411d0b 3434 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3435 spin_unlock(&ifp->lock);
1da177e4
LT		 3436 read_unlock_bh(&idev->lock);
3437
3438 addrconf_dad_completed(ifp);
3439 return;
3440 }
3441
6732bade 3442 if (!(idev->if_flags & IF_READY)) {
21809faf 3443 spin_unlock(&ifp->lock);
6732bade 3444 read_unlock_bh(&idev->lock);
3c21edbd 3445 /*
590a9887 3446 * If the device is not ready:
3c21edbd
YH		 3447 * - keep it tentative if it is a permanent address.
3448 * - otherwise, kill it.
3449 */
3450 in6_ifa_hold(ifp);
cc411d0b 3451 addrconf_dad_stop(ifp, 0);
6732bade 3452 return;
3c21edbd 3453 }
95c385b4
NH		 3454
3455 /*
3456 * Optimistic nodes can start receiving
3457 * Frames right away
3458 */
7fd2561e 3459 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3460 ip6_ins_rt(ifp->rt);
7fd2561e
EK		 3461 if (ipv6_use_optimistic_addr(idev)) {
3462 /* Because optimistic nodes can use this address,
3463 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3464 */
3465 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3466 }
3467 }
95c385b4 3468
6732bade 3469 addrconf_dad_kick(ifp);
1da177e4 3470out:
622ccdf1 3471 spin_unlock(&ifp->lock);
1da177e4
LT		 3472 read_unlock_bh(&idev->lock);
3473}
3474
c15b1cca 3475static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3476{
c15b1cca
HFS		 3477 bool begin_dad = false;
3478
8e8e676d 3479 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3480 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3481 ifp->state = INET6_IFADDR_STATE_PREDAD;
3482 begin_dad = true;
3483 }
8e8e676d 3484 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3485
3486 if (begin_dad)
3487 addrconf_mod_dad_work(ifp, 0);
3488}
3489
3490static void addrconf_dad_work(struct work_struct *w)
3491{
3492 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3493 struct inet6_ifaddr,
3494 dad_work);
1da177e4 3495 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3496 struct in6_addr mcaddr;
3497
c15b1cca
HFS		 3498 enum {
3499 DAD_PROCESS,
3500 DAD_BEGIN,
3501 DAD_ABORT,
3502 } action = DAD_PROCESS;
3503
3504 rtnl_lock();
3505
8e8e676d 3506 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3507 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3508 action = DAD_BEGIN;
3509 ifp->state = INET6_IFADDR_STATE_DAD;
3510 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3511 action = DAD_ABORT;
3512 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3513 }
8e8e676d 3514 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3515
3516 if (action == DAD_BEGIN) {
3517 addrconf_dad_begin(ifp);
3518 goto out;
3519 } else if (action == DAD_ABORT) {
3520 addrconf_dad_stop(ifp, 1);
3521 goto out;
3522 }
3523
b7b1bfce 3524 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3525 goto out;
3526
c15b1cca 3527 write_lock_bh(&idev->lock);
122e4519 3528 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3529 write_unlock_bh(&idev->lock);
1da177e4
LT		 3530 goto out;
3531 }
21809faf 3532
3533 spin_lock(&ifp->lock);
622ccdf1
HX		 3534 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3535 spin_unlock(&ifp->lock);
c15b1cca 3536 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3537 goto out;
3538 }
3539
b7b1bfce 3540 if (ifp->dad_probes == 0) {
1da177e4
LT		 3541 /*
3542 * DAD was successful
3543 */
3544
cc411d0b 3545 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3546 spin_unlock(&ifp->lock);
c15b1cca 3547 write_unlock_bh(&idev->lock);
1da177e4
LT		 3548
3549 addrconf_dad_completed(ifp);
3550
3551 goto out;
3552 }
3553
b7b1bfce 3554 ifp->dad_probes--;
c15b1cca
HFS		 3555 addrconf_mod_dad_work(ifp,
3556 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3557 spin_unlock(&ifp->lock);
c15b1cca 3558 write_unlock_bh(&idev->lock);
1da177e4
LT		 3559
3560 /* send a neighbour solicitation for our addr */
1da177e4 3561 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3562 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3563out:
3564 in6_ifa_put(ifp);
c15b1cca 3565 rtnl_unlock();
1da177e4
LT		 3566}
3567
11ffff75
HFS		 3568/* ifp->idev must be at least read locked */
3569static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3570{
3571 struct inet6_ifaddr *ifpiter;
3572 struct inet6_dev *idev = ifp->idev;
3573
602582ca
HFS		 3574 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3575 if (ifpiter->scope > IFA_LINK)
3576 break;
11ffff75
HFS		 3577 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3578 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3579 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3580 IFA_F_PERMANENT)
3581 return false;
3582 }
3583 return true;
3584}
3585
1da177e4
LT		 3586static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3587{
e21e8467 3588 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3589 struct in6_addr lladdr;
b173ee48 3590 bool send_rs, send_mld;
b7b1bfce 3591
c15b1cca 3592 addrconf_del_dad_work(ifp);
1da177e4
LT		 3593
3594 /*
3595 * Configure the address for reception. Now it is valid.
3596 */
3597
3598 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3599
026359bc
TA		 3600 /* If added prefix is link local and we are prepared to process
3601 router advertisements, start sending router solicitations.
1da177e4
LT		 3602 */
3603
1ec047eb 3604 read_lock_bh(&ifp->idev->lock);
11ffff75 3605 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 3606 send_rs = send_mld &&
3607 ipv6_accept_ra(ifp->idev) &&
1ec047eb 3608 ifp->idev->cnf.rtr_solicits > 0 &&
b173ee48 3609 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 3610 read_unlock_bh(&ifp->idev->lock);
3611
b173ee48
HFS		 3612 /* While dad is in progress mld report's source address is in6_addrany.
3613 * Resend with proper ll now.
3614 */
3615 if (send_mld)
3616 ipv6_mc_dad_complete(ifp->idev);
3617
1ec047eb 3618 if (send_rs) {
1da177e4
LT		 3619 /*
3620 * If a host as already performed a random delay
3621 * [...] as part of DAD [...] there is no need
3622 * to delay again before sending the first RS
3623 */
1ec047eb 3624 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 3625 return;
1ec047eb 3626 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 3627
b7b1bfce
HFS		 3628 write_lock_bh(&ifp->idev->lock);
3629 spin_lock(&ifp->lock);
3630 ifp->idev->rs_probes = 1;
1da177e4 3631 ifp->idev->if_flags |= IF_RS_SENT;
b7b1bfce
HFS		 3632 addrconf_mod_rs_timer(ifp->idev,
3633 ifp->idev->cnf.rtr_solicit_interval);
3634 spin_unlock(&ifp->lock);
3635 write_unlock_bh(&ifp->idev->lock);
1da177e4
LT		 3636 }
3637}
3638
e21e8467
SH		 3639static void addrconf_dad_run(struct inet6_dev *idev)
3640{
c5e33bdd
YH		 3641 struct inet6_ifaddr *ifp;
3642
3643 read_lock_bh(&idev->lock);
502a2ffd 3644 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3645 spin_lock(&ifp->lock);
f2344a13
HX		 3646 if (ifp->flags & IFA_F_TENTATIVE &&
3647 ifp->state == INET6_IFADDR_STATE_DAD)
3648 addrconf_dad_kick(ifp);
21809faf 3649 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3650 }
3651 read_unlock_bh(&idev->lock);
3652}
3653
1da177e4
LT		 3654#ifdef CONFIG_PROC_FS
3655struct if6_iter_state {
3c40090a 3656 struct seq_net_private p;
1da177e4 3657 int bucket;
1d578303 3658 int offset;
1da177e4
LT		 3659};
3660
1d578303 3661static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3662{
3663 struct inet6_ifaddr *ifa = NULL;
3664 struct if6_iter_state *state = seq->private;
1218854a 3665 struct net *net = seq_file_net(seq);
1d578303 3666 int p = 0;
1da177e4 3667
1d578303
MM		 3668 /* initial bucket if pos is 0 */
3669 if (pos == 0) {
3670 state->bucket = 0;
3671 state->offset = 0;
3672 }
3673
3674 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3675 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3676 addr_lst) {
9f0d3c27
ED		 3677 if (!net_eq(dev_net(ifa->idev->dev), net))
3678 continue;
1d578303
MM		 3679 /* sync with offset */
3680 if (p < state->offset) {
3681 p++;
3682 continue;
3683 }
3684 state->offset++;
9f0d3c27 3685 return ifa;
1d578303
MM		 3686 }
3687
3688 /* prepare for next bucket */
3689 state->offset = 0;
3690 p = 0;
1da177e4 3691 }
c2e21293 3692 return NULL;
1da177e4
LT		 3693}
3694
c2e21293 3695static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3696 struct inet6_ifaddr *ifa)
1da177e4
LT		 3697{
3698 struct if6_iter_state *state = seq->private;
1218854a 3699 struct net *net = seq_file_net(seq);
1da177e4 3700
b67bfe0d 3701 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3702 if (!net_eq(dev_net(ifa->idev->dev), net))
3703 continue;
1d578303 3704 state->offset++;
9f0d3c27 3705 return ifa;
1d578303 3706 }
3c40090a 3707
c2e21293 3708 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3709 state->offset = 0;
b67bfe0d 3710 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3711 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3712 if (!net_eq(dev_net(ifa->idev->dev), net))
3713 continue;
1d578303 3714 state->offset++;
9f0d3c27 3715 return ifa;
c2e21293 3716 }
1da177e4 3717 }
3c40090a 3718
c2e21293 3719 return NULL;
1da177e4
LT		 3720}
3721
1da177e4 3722static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3723 __acquires(rcu_bh)
1da177e4 3724{
5c578aed 3725 rcu_read_lock_bh();
1d578303 3726 return if6_get_first(seq, *pos);
1da177e4
LT		 3727}
3728
3729static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3730{
3731 struct inet6_ifaddr *ifa;
3732
3733 ifa = if6_get_next(seq, v);
3734 ++*pos;
3735 return ifa;
3736}
3737
3738static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3739 __releases(rcu_bh)
1da177e4 3740{
5c578aed 3741 rcu_read_unlock_bh();
1da177e4
LT		 3742}
3743
3744static int if6_seq_show(struct seq_file *seq, void *v)
3745{
3746 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 3747 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3748 &ifp->addr,
1da177e4
LT		 3749 ifp->idev->dev->ifindex,
3750 ifp->prefix_len,
3751 ifp->scope,
971a351c 3752 (u8) ifp->flags,
1da177e4
LT		 3753 ifp->idev->dev->name);
3754 return 0;
3755}
3756
56b3d975 3757static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3758 .start = if6_seq_start,
3759 .next = if6_seq_next,
3760 .show = if6_seq_show,
3761 .stop = if6_seq_stop,
3762};
3763
3764static int if6_seq_open(struct inode *inode, struct file *file)
3765{
3c40090a
DL		 3766 return seq_open_net(inode, file, &if6_seq_ops,
3767 sizeof(struct if6_iter_state));
1da177e4
LT		 3768}
3769
9a32144e 3770static const struct file_operations if6_fops = {
1da177e4
LT		 3771 .owner = THIS_MODULE,
3772 .open = if6_seq_open,
3773 .read = seq_read,
3774 .llseek = seq_lseek,
3c40090a 3775 .release = seq_release_net,
1da177e4
LT		 3776};
3777
2c8c1e72 3778static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3779{
d4beaa66 3780 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 3781 return -ENOMEM;
3782 return 0;
3783}
3784
2c8c1e72 3785static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 3786{
ece31ffd 3787 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 3788}
3789
3790static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 3791 .init = if6_proc_net_init,
3792 .exit = if6_proc_net_exit,
3c40090a
DL		 3793};
3794
3795int __init if6_proc_init(void)
3796{
3797 return register_pernet_subsys(&if6_proc_net_ops);
3798}
3799
1da177e4
LT		 3800void if6_proc_exit(void)
3801{
3c40090a 3802 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3803}
3804#endif /* CONFIG_PROC_FS */
3805
07a93626 3806#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3807/* Check if address is a home address configured on any interface. */
b71d1d42 3808int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3809{
3810 int ret = 0;
c2e21293 3811 struct inet6_ifaddr *ifp = NULL;
ddbe5032 3812 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3813
5c578aed 3814 rcu_read_lock_bh();
b67bfe0d 3815 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 3816 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3817 continue;
caad295f 3818 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3819 (ifp->flags & IFA_F_HOMEADDRESS)) {
3820 ret = 1;
3821 break;
3822 }
3823 }
5c578aed 3824 rcu_read_unlock_bh();
3b9f9a1c
NT		 3825 return ret;
3826}
3827#endif
3828
1da177e4
LT		 3829/*
3830 * Periodic address status verification
3831 */
3832
c15b1cca 3833static void addrconf_verify_rtnl(void)
1da177e4 3834{
b2db7564 3835 unsigned long now, next, next_sec, next_sched;
1da177e4 3836 struct inet6_ifaddr *ifp;
1da177e4
LT		 3837 int i;
3838
c15b1cca
HFS		 3839 ASSERT_RTNL();
3840
5c578aed 3841 rcu_read_lock_bh();
1da177e4 3842 now = jiffies;
b2db7564 3843 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 3844
c15b1cca 3845 cancel_delayed_work(&addr_chk_work);
1da177e4 3846
bcdd553f 3847 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3848restart:
c15b1cca 3849 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 3850 unsigned long age;
1da177e4 3851
fad8da3e
YA		 3852 /* When setting preferred_lft to a value not zero or
3853 * infinity, while valid_lft is infinity
3854 * IFA_F_PERMANENT has a non-infinity life time.
3855 */
3856 if ((ifp->flags & IFA_F_PERMANENT) &&
3857 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 3858 continue;
3859
3860 spin_lock(&ifp->lock);
b2db7564
YH		 3861 /* We try to batch several events at once. */
3862 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3863
8f27ebb9
YH		 3864 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3865 age >= ifp->valid_lft) {
1da177e4
LT		 3866 spin_unlock(&ifp->lock);
3867 in6_ifa_hold(ifp);
1da177e4
LT		 3868 ipv6_del_addr(ifp);
3869 goto restart;
8f27ebb9
YH		 3870 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3871 spin_unlock(&ifp->lock);
3872 continue;
1da177e4 3873 } else if (age >= ifp->prefered_lft) {
a1ed0526 3874 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3875 int deprecate = 0;
3876
3877 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3878 deprecate = 1;
3879 ifp->flags |= IFA_F_DEPRECATED;
3880 }
3881
fad8da3e
YA		 3882 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3883 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 3884 next = ifp->tstamp + ifp->valid_lft * HZ;
3885
3886 spin_unlock(&ifp->lock);
3887
3888 if (deprecate) {
3889 in6_ifa_hold(ifp);
1da177e4
LT		 3890
3891 ipv6_ifa_notify(0, ifp);
3892 in6_ifa_put(ifp);
3893 goto restart;
3894 }
1da177e4
LT		 3895 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3896 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3897 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3898 ifp->idev->cnf.dad_transmits *
1f9248e5 3899 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 3900
1da177e4
LT		 3901 if (age >= ifp->prefered_lft - regen_advance) {
3902 struct inet6_ifaddr *ifpub = ifp->ifpub;
3903 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3904 next = ifp->tstamp + ifp->prefered_lft * HZ;
3905 if (!ifp->regen_count && ifpub) {
3906 ifp->regen_count++;
3907 in6_ifa_hold(ifp);
3908 in6_ifa_hold(ifpub);
3909 spin_unlock(&ifp->lock);
5c578aed 3910
291d809b
HY		 3911 spin_lock(&ifpub->lock);
3912 ifpub->regen_count = 0;
3913 spin_unlock(&ifpub->lock);
1da177e4
LT		 3914 ipv6_create_tempaddr(ifpub, ifp);
3915 in6_ifa_put(ifpub);
3916 in6_ifa_put(ifp);
3917 goto restart;
3918 }
3919 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3920 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3921 spin_unlock(&ifp->lock);
1da177e4
LT		 3922 } else {
3923 /* ifp->prefered_lft <= ifp->valid_lft */
3924 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3925 next = ifp->tstamp + ifp->prefered_lft * HZ;
3926 spin_unlock(&ifp->lock);
3927 }
3928 }
1da177e4
LT		 3929 }
3930
b2db7564
YH		 3931 next_sec = round_jiffies_up(next);
3932 next_sched = next;
3933
3934 /* If rounded timeout is accurate enough, accept it. */
3935 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3936 next_sched = next_sec;
3937
3938 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3939 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3940 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3941
ba3542e1 3942 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3943 now, next, next_sec, next_sched);
c15b1cca 3944 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 3945 rcu_read_unlock_bh();
1da177e4
LT		 3946}
3947
c15b1cca
HFS		 3948static void addrconf_verify_work(struct work_struct *w)
3949{
3950 rtnl_lock();
3951 addrconf_verify_rtnl();
3952 rtnl_unlock();
3953}
3954
3955static void addrconf_verify(void)
3956{
3957 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
3958}
3959
caeaba79
ND		 3960static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3961 struct in6_addr **peer_pfx)
461d8837
TG		 3962{
3963 struct in6_addr *pfx = NULL;
3964
caeaba79
ND		 3965 *peer_pfx = NULL;
3966
461d8837
TG		 3967 if (addr)
3968 pfx = nla_data(addr);
3969
3970 if (local) {
3971 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 3972 *peer_pfx = pfx;
3973 pfx = nla_data(local);
461d8837
TG		 3974 }
3975
3976 return pfx;
3977}
3978
ef7c79ed 3979static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3980 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3981 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3982 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 3983 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 3984};
3985
1da177e4 3986static int
661d2967 3987inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 3988{
3b1e0a65 3989 struct net *net = sock_net(skb->sk);
b933f716
TG		 3990 struct ifaddrmsg *ifm;
3991 struct nlattr *tb[IFA_MAX+1];
caeaba79 3992 struct in6_addr *pfx, *peer_pfx;
6046d5b4 3993 u32 ifa_flags;
b933f716 3994 int err;
1da177e4 3995
b933f716
TG		 3996 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3997 if (err < 0)
3998 return err;
3999
4000 ifm = nlmsg_data(nlh);
caeaba79 4001 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 4002 if (pfx == NULL)
4003 return -EINVAL;
4004
6046d5b4
HK		 4005 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4006
4007 /* We ignore other flags so far. */
4008 ifa_flags &= IFA_F_MANAGETEMPADDR;
4009
4010 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4011 ifm->ifa_prefixlen);
1da177e4
LT		 4012}
4013
479840ff 4014static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 4015 u32 prefered_lft, u32 valid_lft)
081bba5b 4016{
6f704992
YH		 4017 u32 flags;
4018 clock_t expires;
4bed72e4 4019 unsigned long timeout;
53bd6749 4020 bool was_managetempaddr;
5b84efec 4021 bool had_prefixroute;
46d48046 4022
c15b1cca
HFS		 4023 ASSERT_RTNL();
4024
081bba5b
NT		 4025 if (!valid_lft || (prefered_lft > valid_lft))
4026 return -EINVAL;
4027
53bd6749
JP		 4028 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4029 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4030 return -EINVAL;
4031
4bed72e4
YH		 4032 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4033 if (addrconf_finite_timeout(timeout)) {
4034 expires = jiffies_to_clock_t(timeout * HZ);
4035 valid_lft = timeout;
6f704992 4036 flags = RTF_EXPIRES;
4bed72e4
YH		 4037 } else {
4038 expires = 0;
4039 flags = 0;
4040 ifa_flags |= IFA_F_PERMANENT;
6f704992 4041 }
081bba5b 4042
4bed72e4
YH		 4043 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4044 if (addrconf_finite_timeout(timeout)) {
4045 if (timeout == 0)
4046 ifa_flags |= IFA_F_DEPRECATED;
4047 prefered_lft = timeout;
4048 }
081bba5b
NT		 4049
4050 spin_lock_bh(&ifp->lock);
53bd6749 4051 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4052 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4053 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4054 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4055 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4056 IFA_F_NOPREFIXROUTE);
53bd6749 4057 ifp->flags |= ifa_flags;
081bba5b
NT		 4058 ifp->tstamp = jiffies;
4059 ifp->valid_lft = valid_lft;
4060 ifp->prefered_lft = prefered_lft;
4061
4062 spin_unlock_bh(&ifp->lock);
4063 if (!(ifp->flags&IFA_F_TENTATIVE))
4064 ipv6_ifa_notify(0, ifp);
081bba5b 4065
761aac73
TH		 4066 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4067 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4068 expires, flags);
5b84efec
TH		 4069 } else if (had_prefixroute) {
4070 enum cleanup_prefix_rt_t action;
4071 unsigned long rt_expires;
4072
4073 write_lock_bh(&ifp->idev->lock);
4074 action = check_cleanup_prefix_route(ifp, &rt_expires);
4075 write_unlock_bh(&ifp->idev->lock);
4076
4077 if (action != CLEANUP_PREFIX_RT_NOP) {
4078 cleanup_prefix_route(ifp, rt_expires,
4079 action == CLEANUP_PREFIX_RT_DEL);
4080 }
761aac73 4081 }
53bd6749
JP		 4082
4083 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4084 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4085 valid_lft = prefered_lft = 0;
4086 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4087 !was_managetempaddr, jiffies);
4088 }
4089
c15b1cca 4090 addrconf_verify_rtnl();
081bba5b
NT		 4091
4092 return 0;
4093}
4094
1da177e4 4095static int
661d2967 4096inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4097{
3b1e0a65 4098 struct net *net = sock_net(skb->sk);
461d8837
TG		 4099 struct ifaddrmsg *ifm;
4100 struct nlattr *tb[IFA_MAX+1];
caeaba79 4101 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 4102 struct inet6_ifaddr *ifa;
4103 struct net_device *dev;
55ebaef1 4104 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 4105 u32 ifa_flags;
461d8837 4106 int err;
1da177e4 4107
461d8837
TG		 4108 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4109 if (err < 0)
4110 return err;
4111
4112 ifm = nlmsg_data(nlh);
caeaba79 4113 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
1da177e4
LT		 4114 if (pfx == NULL)
4115 return -EINVAL;
4116
461d8837 4117 if (tb[IFA_CACHEINFO]) {
0778769d 4118 struct ifa_cacheinfo *ci;
461d8837
TG		 4119
4120 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 4121 valid_lft = ci->ifa_valid;
461d8837
TG		 4122 preferred_lft = ci->ifa_prefered;
4123 } else {
4124 preferred_lft = INFINITY_LIFE_TIME;
4125 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 4126 }
4127
af284937 4128 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 4129 if (dev == NULL)
4130 return -ENODEV;
4131
479840ff
JP		 4132 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4133
55ebaef1 4134 /* We ignore other flags so far. */
761aac73 4135 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
93a714d6 4136 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
55ebaef1 4137
1cab3da6 4138 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 4139 if (ifa == NULL) {
4140 /*
4141 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4142 * userspace already relies on not having to provide this.
7198f8ce 4143 */
caeaba79 4144 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 4145 ifm->ifa_prefixlen, ifa_flags,
4146 preferred_lft, valid_lft);
081bba5b
NT		 4147 }
4148
7198f8ce
TG		 4149 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4150 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4151 err = -EEXIST;
4152 else
55ebaef1 4153 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 4154
4155 in6_ifa_put(ifa);
4156
4157 return err;
1da177e4
LT		 4158}
4159
479840ff 4160static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4161 u8 scope, int ifindex)
4162{
4163 struct ifaddrmsg *ifm;
4164
4165 ifm = nlmsg_data(nlh);
4166 ifm->ifa_family = AF_INET6;
4167 ifm->ifa_prefixlen = prefixlen;
4168 ifm->ifa_flags = flags;
4169 ifm->ifa_scope = scope;
4170 ifm->ifa_index = ifindex;
4171}
4172
85486af0
TG		 4173static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4174 unsigned long tstamp, u32 preferred, u32 valid)
4175{
4176 struct ifa_cacheinfo ci;
4177
18a31e1e
TG		 4178 ci.cstamp = cstamp_delta(cstamp);
4179 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4180 ci.ifa_prefered = preferred;
4181 ci.ifa_valid = valid;
4182
4183 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4184}
4185
101bb229
TG		 4186static inline int rt_scope(int ifa_scope)
4187{
4188 if (ifa_scope & IFA_HOST)
4189 return RT_SCOPE_HOST;
4190 else if (ifa_scope & IFA_LINK)
4191 return RT_SCOPE_LINK;
4192 else if (ifa_scope & IFA_SITE)
4193 return RT_SCOPE_SITE;
4194 else
4195 return RT_SCOPE_UNIVERSE;
4196}
4197
0ab6803b
TG		 4198static inline int inet6_ifaddr_msgsize(void)
4199{
339bf98f 4200 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4201 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4202 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4203 + nla_total_size(sizeof(struct ifa_cacheinfo))
4204 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4205}
c5396a31 4206
1da177e4 4207static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4208 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4209{
1da177e4 4210 struct nlmsghdr *nlh;
85486af0 4211 u32 preferred, valid;
1da177e4 4212
15e47304 4213 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 4214 if (nlh == NULL)
26932566 4215 return -EMSGSIZE;
0ab6803b 4216
101bb229
TG		 4217 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4218 ifa->idev->dev->ifindex);
4219
fad8da3e
YA		 4220 if (!((ifa->flags&IFA_F_PERMANENT) &&
4221 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4222 preferred = ifa->prefered_lft;
4223 valid = ifa->valid_lft;
4224 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4225 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4226 if (preferred > tval)
4227 preferred -= tval;
4228 else
4229 preferred = 0;
f56619fc
BH		 4230 if (valid != INFINITY_LIFE_TIME) {
4231 if (valid > tval)
4232 valid -= tval;
4233 else
4234 valid = 0;
4235 }
1da177e4
LT		 4236 }
4237 } else {
85486af0
TG		 4238 preferred = INFINITY_LIFE_TIME;
4239 valid = INFINITY_LIFE_TIME;
4240 }
4241
7996c799 4242 if (!ipv6_addr_any(&ifa->peer_addr)) {
caeaba79
ND		 4243 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
4244 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
4245 goto error;
4246 } else
4247 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
4248 goto error;
4249
4250 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4251 goto error;
1da177e4 4252
479840ff
JP		 4253 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4254 goto error;
4255
053c095a
JB		 4256 nlmsg_end(skb, nlh);
4257 return 0;
caeaba79
ND		 4258
4259error:
4260 nlmsg_cancel(skb, nlh);
4261 return -EMSGSIZE;
1da177e4
LT		 4262}
4263
4264static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4265 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4266{
1da177e4 4267 struct nlmsghdr *nlh;
101bb229
TG		 4268 u8 scope = RT_SCOPE_UNIVERSE;
4269 int ifindex = ifmca->idev->dev->ifindex;
4270
4271 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4272 scope = RT_SCOPE_SITE;
1da177e4 4273
15e47304 4274 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 4275 if (nlh == NULL)
26932566 4276 return -EMSGSIZE;
85486af0 4277
0ab6803b
TG		 4278 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4279 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
4280 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4281 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4282 nlmsg_cancel(skb, nlh);
4283 return -EMSGSIZE;
4284 }
85486af0 4285
053c095a
JB		 4286 nlmsg_end(skb, nlh);
4287 return 0;
1da177e4
LT		 4288}
4289
4290static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4291 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4292{
1da177e4 4293 struct nlmsghdr *nlh;
101bb229
TG		 4294 u8 scope = RT_SCOPE_UNIVERSE;
4295 int ifindex = ifaca->aca_idev->dev->ifindex;
4296
4297 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4298 scope = RT_SCOPE_SITE;
1da177e4 4299
15e47304 4300 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 4301 if (nlh == NULL)
26932566 4302 return -EMSGSIZE;
85486af0 4303
0ab6803b
TG		 4304 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4305 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
4306 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4307 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4308 nlmsg_cancel(skb, nlh);
4309 return -EMSGSIZE;
4310 }
1da177e4 4311
053c095a
JB		 4312 nlmsg_end(skb, nlh);
4313 return 0;
1da177e4
LT		 4314}
4315
e21e8467 4316enum addr_type_t {
1da177e4
LT		 4317 UNICAST_ADDR,
4318 MULTICAST_ADDR,
4319 ANYCAST_ADDR,
4320};
4321
234b27c3
ED		 4322/* called with rcu_read_lock() */
4323static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4324 struct netlink_callback *cb, enum addr_type_t type,
4325 int s_ip_idx, int *p_ip_idx)
4326{
234b27c3
ED		 4327 struct ifmcaddr6 *ifmca;
4328 struct ifacaddr6 *ifaca;
4329 int err = 1;
4330 int ip_idx = *p_ip_idx;
4331
4332 read_lock_bh(&idev->lock);
4333 switch (type) {
502a2ffd 4334 case UNICAST_ADDR: {
4335 struct inet6_ifaddr *ifa;
4336
234b27c3 4337 /* unicast address incl. temp addr */
502a2ffd 4338 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4339 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4340 continue;
4341 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4342 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4343 cb->nlh->nlmsg_seq,
4344 RTM_NEWADDR,
4345 NLM_F_MULTI);
053c095a 4346 if (err < 0)
234b27c3 4347 break;
63998ac2 4348 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4349 }
4350 break;
502a2ffd 4351 }
234b27c3
ED		 4352 case MULTICAST_ADDR:
4353 /* multicast address */
4354 for (ifmca = idev->mc_list; ifmca;
4355 ifmca = ifmca->next, ip_idx++) {
4356 if (ip_idx < s_ip_idx)
4357 continue;
4358 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4359 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4360 cb->nlh->nlmsg_seq,
4361 RTM_GETMULTICAST,
4362 NLM_F_MULTI);
053c095a 4363 if (err < 0)
234b27c3
ED		 4364 break;
4365 }
4366 break;
4367 case ANYCAST_ADDR:
4368 /* anycast address */
4369 for (ifaca = idev->ac_list; ifaca;
4370 ifaca = ifaca->aca_next, ip_idx++) {
4371 if (ip_idx < s_ip_idx)
4372 continue;
4373 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4374 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4375 cb->nlh->nlmsg_seq,
4376 RTM_GETANYCAST,
4377 NLM_F_MULTI);
053c095a 4378 if (err < 0)
234b27c3
ED		 4379 break;
4380 }
4381 break;
4382 default:
4383 break;
4384 }
4385 read_unlock_bh(&idev->lock);
4386 *p_ip_idx = ip_idx;
4387 return err;
4388}
4389
1da177e4
LT		 4390static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4391 enum addr_type_t type)
4392{
234b27c3
ED		 4393 struct net *net = sock_net(skb->sk);
4394 int h, s_h;
1da177e4
LT		 4395 int idx, ip_idx;
4396 int s_idx, s_ip_idx;
1da177e4 4397 struct net_device *dev;
234b27c3
ED		 4398 struct inet6_dev *idev;
4399 struct hlist_head *head;
1ab1457c 4400
234b27c3
ED		 4401 s_h = cb->args[0];
4402 s_idx = idx = cb->args[1];
4403 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4404
234b27c3 4405 rcu_read_lock();
63998ac2 4406 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4407 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4408 idx = 0;
4409 head = &net->dev_index_head[h];
b67bfe0d 4410 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4411 if (idx < s_idx)
4412 goto cont;
4b97efdf 4413 if (h > s_h || idx > s_idx)
234b27c3
ED		 4414 s_ip_idx = 0;
4415 ip_idx = 0;
e21e8467
SH		 4416 idev = __in6_dev_get(dev);
4417 if (!idev)
234b27c3
ED		 4418 goto cont;
4419
4420 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4421 s_ip_idx, &ip_idx) < 0)
234b27c3 4422 goto done;
7562f876 4423cont:
234b27c3
ED		 4424 idx++;
4425 }
1da177e4 4426 }
234b27c3
ED		 4427done:
4428 rcu_read_unlock();
4429 cb->args[0] = h;
4430 cb->args[1] = idx;
4431 cb->args[2] = ip_idx;
4432
1da177e4
LT		 4433 return skb->len;
4434}
4435
4436static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4437{
4438 enum addr_type_t type = UNICAST_ADDR;
b854272b 4439
1da177e4
LT		 4440 return inet6_dump_addr(skb, cb, type);
4441}
4442
4443static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4444{
4445 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4446
1da177e4
LT		 4447 return inet6_dump_addr(skb, cb, type);
4448}
4449
4450
4451static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4452{
4453 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4454
1da177e4
LT		 4455 return inet6_dump_addr(skb, cb, type);
4456}
4457
661d2967 4458static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4459{
3b1e0a65 4460 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4461 struct ifaddrmsg *ifm;
4462 struct nlattr *tb[IFA_MAX+1];
caeaba79 4463 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4464 struct net_device *dev = NULL;
4465 struct inet6_ifaddr *ifa;
4466 struct sk_buff *skb;
6c223828
NT		 4467 int err;
4468
1b29fc2c
TG		 4469 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4470 if (err < 0)
4471 goto errout;
4472
caeaba79 4473 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
1b29fc2c
TG		 4474 if (addr == NULL) {
4475 err = -EINVAL;
4476 goto errout;
6c223828 4477 }
6c223828 4478
1b29fc2c 4479 ifm = nlmsg_data(nlh);
6c223828 4480 if (ifm->ifa_index)
6fda7350 4481 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4482
e21e8467
SH		 4483 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4484 if (!ifa) {
1b29fc2c
TG		 4485 err = -EADDRNOTAVAIL;
4486 goto errout;
4487 }
6c223828 4488
e21e8467
SH		 4489 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4490 if (!skb) {
6c223828 4491 err = -ENOBUFS;
1b29fc2c 4492 goto errout_ifa;
6c223828
NT		 4493 }
4494
15e47304 4495 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4496 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4497 if (err < 0) {
4498 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4499 WARN_ON(err == -EMSGSIZE);
4500 kfree_skb(skb);
4501 goto errout_ifa;
4502 }
15e47304 4503 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4504errout_ifa:
6c223828 4505 in6_ifa_put(ifa);
1b29fc2c 4506errout:
6c223828 4507 return err;
6c223828
NT		 4508}
4509
1da177e4
LT		 4510static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4511{
4512 struct sk_buff *skb;
c346dca1 4513 struct net *net = dev_net(ifa->idev->dev);
5d620266 4514 int err = -ENOBUFS;
1da177e4 4515
0ab6803b 4516 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 4517 if (skb == NULL)
4518 goto errout;
4519
4520 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4521 if (err < 0) {
4522 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4523 WARN_ON(err == -EMSGSIZE);
4524 kfree_skb(skb);
4525 goto errout;
4526 }
1ce85fe4
PNA		 4527 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4528 return;
5d620266
TG		 4529errout:
4530 if (err < 0)
6fda7350 4531 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4532}
4533
b6f99a21 4534static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4535 __s32 *array, int bytes)
4536{
04561c1f
TG		 4537 BUG_ON(bytes < (DEVCONF_MAX * 4));
4538
1da177e4
LT		 4539 memset(array, 0, bytes);
4540 array[DEVCONF_FORWARDING] = cnf->forwarding;
4541 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4542 array[DEVCONF_MTU6] = cnf->mtu6;
4543 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4544 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4545 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4546 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4547 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4548 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4549 jiffies_to_msecs(cnf->rtr_solicit_interval);
4550 array[DEVCONF_RTR_SOLICIT_DELAY] =
4551 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4552 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4553 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4554 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4555 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4556 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4557 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4558 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4559 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4560 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4561 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4562 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4563 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 4564 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4565#ifdef CONFIG_IPV6_ROUTER_PREF
4566 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4567 array[DEVCONF_RTR_PROBE_INTERVAL] =
4568 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4569#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4570 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4571#endif
930d6ff2 4572#endif
fbea49e1 4573 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4574 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4575#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4576 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 4577 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 4578#endif
7bc570c8
YH		 4579#ifdef CONFIG_IPV6_MROUTE
4580 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4581#endif
778d80be 4582 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4583 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4584 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4585 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 4586 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 4587 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 4588 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
3d1bec99 4589 /* we omit DEVCONF_STABLE_SECRET for now */
1da177e4
LT		 4590}
4591
b382b191
TG		 4592static inline size_t inet6_ifla6_size(void)
4593{
4594 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4595 + nla_total_size(sizeof(struct ifla_cacheinfo))
4596 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4597 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4598 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4599 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4600}
4601
339bf98f
TG		 4602static inline size_t inet6_if_nlmsg_size(void)
4603{
4604 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4605 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4606 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4607 + nla_total_size(4) /* IFLA_MTU */
4608 + nla_total_size(4) /* IFLA_LINK */
b382b191 4609 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4610}
c5396a31 4611
be281e55 4612static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4613 int items, int bytes)
7f7d9a6b
HX		 4614{
4615 int i;
4616 int pad = bytes - sizeof(u64) * items;
4617 BUG_ON(pad < 0);
4618
4619 /* Use put_unaligned() because stats may not be aligned for u64. */
4620 put_unaligned(items, &stats[0]);
4621 for (i = 1; i < items; i++)
be281e55 4622 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4623
4624 memset(&stats[items], 0, pad);
4625}
4626
698365fa 4627static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4ce3c183
ED		 4628 int items, int bytes, size_t syncpoff)
4629{
4630 int i;
4631 int pad = bytes - sizeof(u64) * items;
4632 BUG_ON(pad < 0);
4633
4634 /* Use put_unaligned() because stats may not be aligned for u64. */
4635 put_unaligned(items, &stats[0]);
4636 for (i = 1; i < items; i++)
4637 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4638
4639 memset(&stats[items], 0, pad);
4640}
4641
7f7d9a6b
HX		 4642static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4643 int bytes)
4644{
e21e8467 4645 switch (attrtype) {
7f7d9a6b 4646 case IFLA_INET6_STATS:
698365fa 4647 __snmp6_fill_stats64(stats, idev->stats.ipv6,
4ce3c183 4648 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4649 break;
4650 case IFLA_INET6_ICMP6STATS:
be281e55 4651 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4652 break;
4653 }
4654}
4655
b382b191
TG		 4656static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4657{
4658 struct nlattr *nla;
4659 struct ifla_cacheinfo ci;
4660
c78679e8
DM		 4661 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4662 goto nla_put_failure;
b382b191 4663 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4664 ci.tstamp = cstamp_delta(idev->tstamp);
4665 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 4666 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 4667 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4668 goto nla_put_failure;
b382b191
TG		 4669 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4670 if (nla == NULL)
4671 goto nla_put_failure;
4672 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4673
4674 /* XXX - MC not implemented */
4675
4676 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4677 if (nla == NULL)
4678 goto nla_put_failure;
4679 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4680
4681 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4682 if (nla == NULL)
4683 goto nla_put_failure;
4684 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4685
f53adae4
DB		 4686 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4687 if (nla == NULL)
4688 goto nla_put_failure;
bc91b0f0
JP		 4689
4690 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4691 goto nla_put_failure;
4692
f53adae4
DB		 4693 read_lock_bh(&idev->lock);
4694 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4695 read_unlock_bh(&idev->lock);
4696
b382b191
TG		 4697 return 0;
4698
4699nla_put_failure:
4700 return -EMSGSIZE;
4701}
4702
4703static size_t inet6_get_link_af_size(const struct net_device *dev)
4704{
4705 if (!__in6_dev_get(dev))
4706 return 0;
4707
4708 return inet6_ifla6_size();
4709}
4710
4711static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4712{
4713 struct inet6_dev *idev = __in6_dev_get(dev);
4714
4715 if (!idev)
4716 return -ENODATA;
4717
4718 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4719 return -EMSGSIZE;
4720
4721 return 0;
4722}
4723
f53adae4
DB		 4724static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4725{
f53adae4
DB		 4726 struct inet6_ifaddr *ifp;
4727 struct net_device *dev = idev->dev;
fc403832 4728 bool update_rs = false;
dc848292 4729 struct in6_addr ll_addr;
f53adae4 4730
c15b1cca
HFS		 4731 ASSERT_RTNL();
4732
f53adae4
DB		 4733 if (token == NULL)
4734 return -EINVAL;
4735 if (ipv6_addr_any(token))
4736 return -EINVAL;
4737 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4738 return -EINVAL;
f53adae4
DB		 4739 if (!ipv6_accept_ra(idev))
4740 return -EINVAL;
4741 if (idev->cnf.rtr_solicits <= 0)
4742 return -EINVAL;
4743
4744 write_lock_bh(&idev->lock);
4745
4746 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4747 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4748
4749 write_unlock_bh(&idev->lock);
4750
dc848292
HFS		 4751 if (!idev->dead && (idev->if_flags & IF_READY) &&
4752 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4753 IFA_F_OPTIMISTIC)) {
fc403832
DB		 4754
4755 /* If we're not ready, then normal ifup will take care
4756 * of this. Otherwise, we need to request our rs here.
4757 */
4758 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4759 update_rs = true;
4760 }
f53adae4
DB		 4761
4762 write_lock_bh(&idev->lock);
fc403832 4763
77ecaace 4764 if (update_rs) {
fc403832 4765 idev->if_flags |= IF_RS_SENT;
77ecaace
HFS		 4766 idev->rs_probes = 1;
4767 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4768 }
f53adae4
DB		 4769
4770 /* Well, that's kinda nasty ... */
4771 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4772 spin_lock(&ifp->lock);
617fe29d 4773 if (ifp->tokenized) {
f53adae4
DB		 4774 ifp->valid_lft = 0;
4775 ifp->prefered_lft = 0;
4776 }
4777 spin_unlock(&ifp->lock);
4778 }
4779
4780 write_unlock_bh(&idev->lock);
b2ed64a9 4781 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 4782 addrconf_verify_rtnl();
f53adae4
DB		 4783 return 0;
4784}
4785
11b1f828
DB		 4786static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4787 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
4788 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
4789};
4790
4791static int inet6_validate_link_af(const struct net_device *dev,
4792 const struct nlattr *nla)
4793{
4794 struct nlattr *tb[IFLA_INET6_MAX + 1];
4795
4796 if (dev && !__in6_dev_get(dev))
4797 return -EAFNOSUPPORT;
4798
4799 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4800}
4801
f53adae4
DB		 4802static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4803{
4804 int err = -EINVAL;
4805 struct inet6_dev *idev = __in6_dev_get(dev);
4806 struct nlattr *tb[IFLA_INET6_MAX + 1];
4807
4808 if (!idev)
4809 return -EAFNOSUPPORT;
4810
4811 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4812 BUG();
4813
bc91b0f0 4814 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 4815 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 4816 if (err)
4817 return err;
4818 }
4819
4820 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4821 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4822
4823 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
622c81d5
HFS		 4824 mode != IN6_ADDR_GEN_MODE_NONE &&
4825 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
4826 return -EINVAL;
4827
4828 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4829 !idev->cnf.stable_secret.initialized &&
4830 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
bc91b0f0 4831 return -EINVAL;
622c81d5 4832
bc91b0f0
JP		 4833 idev->addr_gen_mode = mode;
4834 err = 0;
4835 }
f53adae4
DB		 4836
4837 return err;
4838}
4839
1ab1457c 4840static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4841 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4842{
04561c1f 4843 struct net_device *dev = idev->dev;
04561c1f
TG		 4844 struct ifinfomsg *hdr;
4845 struct nlmsghdr *nlh;
4846 void *protoinfo;
04561c1f 4847
15e47304 4848 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
04561c1f 4849 if (nlh == NULL)
26932566 4850 return -EMSGSIZE;
04561c1f
TG		 4851
4852 hdr = nlmsg_data(nlh);
4853 hdr->ifi_family = AF_INET6;
4854 hdr->__ifi_pad = 0;
4855 hdr->ifi_type = dev->type;
4856 hdr->ifi_index = dev->ifindex;
4857 hdr->ifi_flags = dev_get_flags(dev);
4858 hdr->ifi_change = 0;
4859
c78679e8
DM		 4860 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4861 (dev->addr_len &&
4862 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4863 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4864 (dev->ifindex != dev->iflink &&
4865 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4866 goto nla_put_failure;
04561c1f
TG		 4867 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4868 if (protoinfo == NULL)
4869 goto nla_put_failure;
1da177e4 4870
b382b191 4871 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4872 goto nla_put_failure;
1da177e4 4873
04561c1f 4874 nla_nest_end(skb, protoinfo);
053c095a
JB		 4875 nlmsg_end(skb, nlh);
4876 return 0;
1da177e4 4877
04561c1f 4878nla_put_failure:
26932566
PM		 4879 nlmsg_cancel(skb, nlh);
4880 return -EMSGSIZE;
1da177e4
LT		 4881}
4882
4883static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4884{
3b1e0a65 4885 struct net *net = sock_net(skb->sk);
84d2697d 4886 int h, s_h;
434a8a58 4887 int idx = 0, s_idx;
1da177e4
LT		 4888 struct net_device *dev;
4889 struct inet6_dev *idev;
84d2697d 4890 struct hlist_head *head;
1da177e4 4891
84d2697d
ED		 4892 s_h = cb->args[0];
4893 s_idx = cb->args[1];
4894
4895 rcu_read_lock();
4896 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4897 idx = 0;
4898 head = &net->dev_index_head[h];
b67bfe0d 4899 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 4900 if (idx < s_idx)
4901 goto cont;
4902 idev = __in6_dev_get(dev);
4903 if (!idev)
4904 goto cont;
4905 if (inet6_fill_ifinfo(skb, idev,
15e47304 4906 NETLINK_CB(cb->skb).portid,
84d2697d 4907 cb->nlh->nlmsg_seq,
053c095a 4908 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 4909 goto out;
7562f876 4910cont:
84d2697d
ED		 4911 idx++;
4912 }
1da177e4 4913 }
84d2697d
ED		 4914out:
4915 rcu_read_unlock();
4916 cb->args[1] = idx;
4917 cb->args[0] = h;
1da177e4
LT		 4918
4919 return skb->len;
4920}
4921
4922void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4923{
4924 struct sk_buff *skb;
c346dca1 4925 struct net *net = dev_net(idev->dev);
8d7a76c9 4926 int err = -ENOBUFS;
1ab1457c 4927
339bf98f 4928 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4929 if (skb == NULL)
4930 goto errout;
4931
4932 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4933 if (err < 0) {
4934 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4935 WARN_ON(err == -EMSGSIZE);
4936 kfree_skb(skb);
4937 goto errout;
4938 }
5f75a104 4939 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4940 return;
8d7a76c9
TG		 4941errout:
4942 if (err < 0)
5f75a104 4943 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4944}
4945
339bf98f
TG		 4946static inline size_t inet6_prefix_nlmsg_size(void)
4947{
4948 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4949 + nla_total_size(sizeof(struct in6_addr))
4950 + nla_total_size(sizeof(struct prefix_cacheinfo));
4951}
c5396a31 4952
1da177e4 4953static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4954 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 4955 int event, unsigned int flags)
1da177e4 4956{
6051e2f4
TG		 4957 struct prefixmsg *pmsg;
4958 struct nlmsghdr *nlh;
1da177e4
LT		 4959 struct prefix_cacheinfo ci;
4960
15e47304 4961 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6051e2f4 4962 if (nlh == NULL)
26932566 4963 return -EMSGSIZE;
6051e2f4
TG		 4964
4965 pmsg = nlmsg_data(nlh);
1da177e4 4966 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4967 pmsg->prefix_pad1 = 0;
4968 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4969 pmsg->prefix_ifindex = idev->dev->ifindex;
4970 pmsg->prefix_len = pinfo->prefix_len;
4971 pmsg->prefix_type = pinfo->type;
8a47077a 4972 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4973 pmsg->prefix_flags = 0;
4974 if (pinfo->onlink)
4975 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4976 if (pinfo->autoconf)
4977 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4978
c78679e8
DM		 4979 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4980 goto nla_put_failure;
1da177e4
LT		 4981 ci.preferred_time = ntohl(pinfo->prefered);
4982 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 4983 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4984 goto nla_put_failure;
053c095a
JB		 4985 nlmsg_end(skb, nlh);
4986 return 0;
1da177e4 4987
6051e2f4 4988nla_put_failure:
26932566
PM		 4989 nlmsg_cancel(skb, nlh);
4990 return -EMSGSIZE;
1da177e4
LT		 4991}
4992
1ab1457c 4993static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4994 struct prefix_info *pinfo)
4995{
4996 struct sk_buff *skb;
c346dca1 4997 struct net *net = dev_net(idev->dev);
8c384bfa 4998 int err = -ENOBUFS;
1da177e4 4999
339bf98f 5000 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 5001 if (skb == NULL)
5002 goto errout;
5003
5004 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5005 if (err < 0) {
5006 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5007 WARN_ON(err == -EMSGSIZE);
5008 kfree_skb(skb);
5009 goto errout;
5010 }
1ce85fe4
PNA		 5011 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5012 return;
8c384bfa
TG		 5013errout:
5014 if (err < 0)
6fda7350 5015 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5016}
5017
1da177e4
LT		 5018static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5019{
63998ac2
ND		 5020 struct net *net = dev_net(ifp->idev->dev);
5021
c15b1cca
HFS		 5022 if (event)
5023 ASSERT_RTNL();
5024
1da177e4
LT		 5025 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5026
5027 switch (event) {
5028 case RTM_NEWADDR:
95c385b4
NH		 5029 /*
5030 * If the address was optimistic
5031 * we inserted the route at the start of
5032 * our DAD process, so we don't need
5033 * to do it again
5034 */
5035 if (!(ifp->rt->rt6i_node))
5036 ip6_ins_rt(ifp->rt);
1da177e4
LT		 5037 if (ifp->idev->cnf.forwarding)
5038 addrconf_join_anycast(ifp);
7996c799 5039 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 5040 addrconf_prefix_route(&ifp->peer_addr, 128,
5041 ifp->idev->dev, 0, 0);
1da177e4
LT		 5042 break;
5043 case RTM_DELADDR:
5044 if (ifp->idev->cnf.forwarding)
5045 addrconf_leave_anycast(ifp);
5046 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5047 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 5048 struct rt6_info *rt;
caeaba79 5049
e7478dfc
ND		 5050 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5051 ifp->idev->dev, 0, 0);
f24062b0
ND		 5052 if (rt && ip6_del_rt(rt))
5053 dst_free(&rt->dst);
caeaba79 5054 }
d8d1f30b 5055 dst_hold(&ifp->rt->dst);
93fa159a 5056
73a8bd74 5057 if (ip6_del_rt(ifp->rt))
d8d1f30b 5058 dst_free(&ifp->rt->dst);
705f1c86
HFS		 5059
5060 rt_genid_bump_ipv6(net);
1da177e4
LT		 5061 break;
5062 }
63998ac2 5063 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5064}
5065
5066static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5067{
8814c4b5 5068 rcu_read_lock_bh();
1da177e4
LT		 5069 if (likely(ifp->idev->dead == 0))
5070 __ipv6_ifa_notify(event, ifp);
8814c4b5 5071 rcu_read_unlock_bh();
1da177e4
LT		 5072}
5073
5074#ifdef CONFIG_SYSCTL
5075
5076static
fe2c6338 5077int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5078 void __user *buffer, size_t *lenp, loff_t *ppos)
5079{
5080 int *valp = ctl->data;
5081 int val = *valp;
88af182e 5082 loff_t pos = *ppos;
fe2c6338 5083 struct ctl_table lctl;
1da177e4
LT		 5084 int ret;
5085
013d97e9
FR		 5086 /*
5087 * ctl->data points to idev->cnf.forwarding, we should
5088 * not modify it until we get the rtnl lock.
5089 */
5090 lctl = *ctl;
5091 lctl.data = &val;
5092
5093 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5094
c8fecf22 5095 if (write)
b325fddb 5096 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5097 if (ret)
5098 *ppos = pos;
1ab1457c 5099 return ret;
1da177e4
LT		 5100}
5101
77751427
ML		 5102static
5103int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5104 void __user *buffer, size_t *lenp, loff_t *ppos)
5105{
5106 struct inet6_dev *idev = ctl->extra1;
5107 int min_mtu = IPV6_MIN_MTU;
5108 struct ctl_table lctl;
5109
5110 lctl = *ctl;
5111 lctl.extra1 = &min_mtu;
5112 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5113
5114 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5115}
5116
56d417b1
BH		 5117static void dev_disable_change(struct inet6_dev *idev)
5118{
75538c2b
CW		 5119 struct netdev_notifier_info info;
5120
56d417b1
BH		 5121 if (!idev || !idev->dev)
5122 return;
5123
75538c2b 5124 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5125 if (idev->cnf.disable_ipv6)
75538c2b 5126 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5127 else
75538c2b 5128 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5129}
5130
5131static void addrconf_disable_change(struct net *net, __s32 newf)
5132{
5133 struct net_device *dev;
5134 struct inet6_dev *idev;
5135
c6d14c84
ED		 5136 rcu_read_lock();
5137 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 5138 idev = __in6_dev_get(dev);
5139 if (idev) {
5140 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5141 idev->cnf.disable_ipv6 = newf;
5142 if (changed)
5143 dev_disable_change(idev);
5144 }
56d417b1 5145 }
c6d14c84 5146 rcu_read_unlock();
56d417b1
BH		 5147}
5148
013d97e9 5149static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5150{
5151 struct net *net;
013d97e9
FR		 5152 int old;
5153
5154 if (!rtnl_trylock())
5155 return restart_syscall();
56d417b1
BH		 5156
5157 net = (struct net *)table->extra2;
013d97e9
FR		 5158 old = *p;
5159 *p = newf;
56d417b1 5160
013d97e9
FR		 5161 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5162 rtnl_unlock();
56d417b1 5163 return 0;
88af182e 5164 }
56d417b1
BH		 5165
5166 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5167 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5168 addrconf_disable_change(net, newf);
013d97e9 5169 } else if ((!newf) ^ (!old))
56d417b1
BH		 5170 dev_disable_change((struct inet6_dev *)table->extra1);
5171
5172 rtnl_unlock();
5173 return 0;
5174}
5175
5176static
fe2c6338 5177int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5178 void __user *buffer, size_t *lenp, loff_t *ppos)
5179{
5180 int *valp = ctl->data;
5181 int val = *valp;
88af182e 5182 loff_t pos = *ppos;
fe2c6338 5183 struct ctl_table lctl;
56d417b1
BH		 5184 int ret;
5185
013d97e9
FR		 5186 /*
5187 * ctl->data points to idev->cnf.disable_ipv6, we should
5188 * not modify it until we get the rtnl lock.
5189 */
5190 lctl = *ctl;
5191 lctl.data = &val;
5192
5193 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5194
5195 if (write)
5196 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5197 if (ret)
5198 *ppos = pos;
56d417b1
BH		 5199 return ret;
5200}
5201
c92d5491 5202static
5203int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5204 void __user *buffer, size_t *lenp, loff_t *ppos)
5205{
5206 int *valp = ctl->data;
5207 int ret;
5208 int old, new;
5209
5210 old = *valp;
5211 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5212 new = *valp;
5213
5214 if (write && old != new) {
5215 struct net *net = ctl->extra2;
5216
5217 if (!rtnl_trylock())
5218 return restart_syscall();
5219
5220 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5221 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5222 NETCONFA_IFINDEX_DEFAULT,
5223 net->ipv6.devconf_dflt);
5224 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5225 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5226 NETCONFA_IFINDEX_ALL,
5227 net->ipv6.devconf_all);
5228 else {
5229 struct inet6_dev *idev = ctl->extra1;
5230
5231 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5232 idev->dev->ifindex,
5233 &idev->cnf);
5234 }
5235 rtnl_unlock();
5236 }
5237
5238 return ret;
5239}
5240
3d1bec99
HFS		 5241static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5242 void __user *buffer, size_t *lenp,
5243 loff_t *ppos)
5244{
5245 int err;
5246 struct in6_addr addr;
5247 char str[IPV6_MAX_STRLEN];
5248 struct ctl_table lctl = *ctl;
622c81d5 5249 struct net *net = ctl->extra2;
3d1bec99
HFS		 5250 struct ipv6_stable_secret *secret = ctl->data;
5251
622c81d5
HFS		 5252 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5253 return -EIO;
5254
3d1bec99
HFS		 5255 lctl.maxlen = IPV6_MAX_STRLEN;
5256 lctl.data = str;
5257
5258 if (!rtnl_trylock())
5259 return restart_syscall();
5260
5261 if (!write && !secret->initialized) {
5262 err = -EIO;
5263 goto out;
5264 }
5265
5266 if (!write) {
5267 err = snprintf(str, sizeof(str), "%pI6",
5268 &secret->secret);
5269 if (err >= sizeof(str)) {
5270 err = -EIO;
5271 goto out;
5272 }
5273 }
5274
5275 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5276 if (err || !write)
5277 goto out;
5278
5279 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5280 err = -EIO;
5281 goto out;
5282 }
5283
5284 secret->initialized = true;
5285 secret->secret = addr;
5286
622c81d5
HFS		 5287 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5288 struct net_device *dev;
5289
5290 for_each_netdev(net, dev) {
5291 struct inet6_dev *idev = __in6_dev_get(dev);
5292
5293 if (idev) {
5294 idev->addr_gen_mode =
5295 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5296 }
5297 }
5298 } else {
5299 struct inet6_dev *idev = ctl->extra1;
5300
5301 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5302 }
5303
3d1bec99
HFS		 5304out:
5305 rtnl_unlock();
5306
5307 return err;
5308}
c92d5491 5309
1da177e4
LT		 5310static struct addrconf_sysctl_table
5311{
5312 struct ctl_table_header *sysctl_header;
fe2c6338 5313 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 5314} addrconf_sysctl __read_mostly = {
1da177e4
LT		 5315 .sysctl_header = NULL,
5316 .addrconf_vars = {
1ab1457c 5317 {
e21e8467
SH		 5318 .procname = "forwarding",
5319 .data = &ipv6_devconf.forwarding,
5320 .maxlen = sizeof(int),
5321 .mode = 0644,
5322 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 5323 },
5324 {
e21e8467
SH		 5325 .procname = "hop_limit",
5326 .data = &ipv6_devconf.hop_limit,
5327 .maxlen = sizeof(int),
5328 .mode = 0644,
5329 .proc_handler = proc_dointvec,
1da177e4
LT		 5330 },
5331 {
e21e8467
SH		 5332 .procname = "mtu",
5333 .data = &ipv6_devconf.mtu6,
5334 .maxlen = sizeof(int),
5335 .mode = 0644,
77751427 5336 .proc_handler = addrconf_sysctl_mtu,
1da177e4
LT		 5337 },
5338 {
e21e8467
SH		 5339 .procname = "accept_ra",
5340 .data = &ipv6_devconf.accept_ra,
5341 .maxlen = sizeof(int),
5342 .mode = 0644,
5343 .proc_handler = proc_dointvec,
1da177e4
LT		 5344 },
5345 {
e21e8467
SH		 5346 .procname = "accept_redirects",
5347 .data = &ipv6_devconf.accept_redirects,
5348 .maxlen = sizeof(int),
5349 .mode = 0644,
5350 .proc_handler = proc_dointvec,
1da177e4
LT		 5351 },
5352 {
e21e8467
SH		 5353 .procname = "autoconf",
5354 .data = &ipv6_devconf.autoconf,
5355 .maxlen = sizeof(int),
5356 .mode = 0644,
5357 .proc_handler = proc_dointvec,
1da177e4
LT		 5358 },
5359 {
e21e8467
SH		 5360 .procname = "dad_transmits",
5361 .data = &ipv6_devconf.dad_transmits,
5362 .maxlen = sizeof(int),
5363 .mode = 0644,
5364 .proc_handler = proc_dointvec,
1da177e4
LT		 5365 },
5366 {
e21e8467
SH		 5367 .procname = "router_solicitations",
5368 .data = &ipv6_devconf.rtr_solicits,
5369 .maxlen = sizeof(int),
5370 .mode = 0644,
5371 .proc_handler = proc_dointvec,
1da177e4
LT		 5372 },
5373 {
e21e8467
SH		 5374 .procname = "router_solicitation_interval",
5375 .data = &ipv6_devconf.rtr_solicit_interval,
5376 .maxlen = sizeof(int),
5377 .mode = 0644,
5378 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5379 },
5380 {
e21e8467
SH		 5381 .procname = "router_solicitation_delay",
5382 .data = &ipv6_devconf.rtr_solicit_delay,
5383 .maxlen = sizeof(int),
5384 .mode = 0644,
5385 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5386 },
5387 {
e21e8467
SH		 5388 .procname = "force_mld_version",
5389 .data = &ipv6_devconf.force_mld_version,
5390 .maxlen = sizeof(int),
5391 .mode = 0644,
5392 .proc_handler = proc_dointvec,
1da177e4 5393 },
fc4eba58
HFS		 5394 {
5395 .procname = "mldv1_unsolicited_report_interval",
5396 .data =
5397 &ipv6_devconf.mldv1_unsolicited_report_interval,
5398 .maxlen = sizeof(int),
5399 .mode = 0644,
5400 .proc_handler = proc_dointvec_ms_jiffies,
5401 },
5402 {
5403 .procname = "mldv2_unsolicited_report_interval",
5404 .data =
5405 &ipv6_devconf.mldv2_unsolicited_report_interval,
5406 .maxlen = sizeof(int),
5407 .mode = 0644,
5408 .proc_handler = proc_dointvec_ms_jiffies,
5409 },
1da177e4 5410 {
e21e8467
SH		 5411 .procname = "use_tempaddr",
5412 .data = &ipv6_devconf.use_tempaddr,
5413 .maxlen = sizeof(int),
5414 .mode = 0644,
5415 .proc_handler = proc_dointvec,
1da177e4
LT		 5416 },
5417 {
e21e8467
SH		 5418 .procname = "temp_valid_lft",
5419 .data = &ipv6_devconf.temp_valid_lft,
5420 .maxlen = sizeof(int),
5421 .mode = 0644,
5422 .proc_handler = proc_dointvec,
1da177e4
LT		 5423 },
5424 {
e21e8467
SH		 5425 .procname = "temp_prefered_lft",
5426 .data = &ipv6_devconf.temp_prefered_lft,
5427 .maxlen = sizeof(int),
5428 .mode = 0644,
5429 .proc_handler = proc_dointvec,
1da177e4
LT		 5430 },
5431 {
e21e8467
SH		 5432 .procname = "regen_max_retry",
5433 .data = &ipv6_devconf.regen_max_retry,
5434 .maxlen = sizeof(int),
5435 .mode = 0644,
5436 .proc_handler = proc_dointvec,
1da177e4
LT		 5437 },
5438 {
e21e8467
SH		 5439 .procname = "max_desync_factor",
5440 .data = &ipv6_devconf.max_desync_factor,
5441 .maxlen = sizeof(int),
5442 .mode = 0644,
5443 .proc_handler = proc_dointvec,
1da177e4 5444 },
1da177e4 5445 {
e21e8467
SH		 5446 .procname = "max_addresses",
5447 .data = &ipv6_devconf.max_addresses,
5448 .maxlen = sizeof(int),
5449 .mode = 0644,
5450 .proc_handler = proc_dointvec,
1da177e4 5451 },
65f5c7c1 5452 {
e21e8467
SH		 5453 .procname = "accept_ra_defrtr",
5454 .data = &ipv6_devconf.accept_ra_defrtr,
5455 .maxlen = sizeof(int),
5456 .mode = 0644,
5457 .proc_handler = proc_dointvec,
65f5c7c1 5458 },
c4fd30eb 5459 {
e21e8467
SH		 5460 .procname = "accept_ra_pinfo",
5461 .data = &ipv6_devconf.accept_ra_pinfo,
5462 .maxlen = sizeof(int),
5463 .mode = 0644,
5464 .proc_handler = proc_dointvec,
c4fd30eb 5465 },
930d6ff2
YH		 5466#ifdef CONFIG_IPV6_ROUTER_PREF
5467 {
e21e8467
SH		 5468 .procname = "accept_ra_rtr_pref",
5469 .data = &ipv6_devconf.accept_ra_rtr_pref,
5470 .maxlen = sizeof(int),
5471 .mode = 0644,
5472 .proc_handler = proc_dointvec,
930d6ff2 5473 },
52e16356 5474 {
e21e8467
SH		 5475 .procname = "router_probe_interval",
5476 .data = &ipv6_devconf.rtr_probe_interval,
5477 .maxlen = sizeof(int),
5478 .mode = 0644,
5479 .proc_handler = proc_dointvec_jiffies,
52e16356 5480 },
fa03ef38 5481#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 5482 {
e21e8467
SH		 5483 .procname = "accept_ra_rt_info_max_plen",
5484 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5485 .maxlen = sizeof(int),
5486 .mode = 0644,
5487 .proc_handler = proc_dointvec,
09c884d4
YH		 5488 },
5489#endif
930d6ff2 5490#endif
fbea49e1 5491 {
e21e8467
SH		 5492 .procname = "proxy_ndp",
5493 .data = &ipv6_devconf.proxy_ndp,
5494 .maxlen = sizeof(int),
5495 .mode = 0644,
c92d5491 5496 .proc_handler = addrconf_sysctl_proxy_ndp,
fbea49e1 5497 },
0bcbc926 5498 {
e21e8467
SH		 5499 .procname = "accept_source_route",
5500 .data = &ipv6_devconf.accept_source_route,
5501 .maxlen = sizeof(int),
5502 .mode = 0644,
5503 .proc_handler = proc_dointvec,
0bcbc926 5504 },
95c385b4
NH		 5505#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5506 {
e21e8467
SH		 5507 .procname = "optimistic_dad",
5508 .data = &ipv6_devconf.optimistic_dad,
5509 .maxlen = sizeof(int),
5510 .mode = 0644,
5511 .proc_handler = proc_dointvec,
95c385b4
NH		 5512
5513 },
7fd2561e
EK		 5514 {
5515 .procname = "use_optimistic",
5516 .data = &ipv6_devconf.use_optimistic,
5517 .maxlen = sizeof(int),
5518 .mode = 0644,
5519 .proc_handler = proc_dointvec,
5520
5521 },
7bc570c8
YH		 5522#endif
5523#ifdef CONFIG_IPV6_MROUTE
5524 {
e21e8467
SH		 5525 .procname = "mc_forwarding",
5526 .data = &ipv6_devconf.mc_forwarding,
5527 .maxlen = sizeof(int),
5528 .mode = 0444,
5529 .proc_handler = proc_dointvec,
7bc570c8 5530 },
95c385b4 5531#endif
778d80be 5532 {
e21e8467
SH		 5533 .procname = "disable_ipv6",
5534 .data = &ipv6_devconf.disable_ipv6,
5535 .maxlen = sizeof(int),
5536 .mode = 0644,
5537 .proc_handler = addrconf_sysctl_disable,
778d80be 5538 },
1b34be74 5539 {
e21e8467
SH		 5540 .procname = "accept_dad",
5541 .data = &ipv6_devconf.accept_dad,
5542 .maxlen = sizeof(int),
5543 .mode = 0644,
5544 .proc_handler = proc_dointvec,
1b34be74 5545 },
f7734fdf 5546 {
f7734fdf
OP		 5547 .procname = "force_tllao",
5548 .data = &ipv6_devconf.force_tllao,
5549 .maxlen = sizeof(int),
5550 .mode = 0644,
5551 .proc_handler = proc_dointvec
5552 },
5cb04436
HFS		 5553 {
5554 .procname = "ndisc_notify",
5555 .data = &ipv6_devconf.ndisc_notify,
5556 .maxlen = sizeof(int),
5557 .mode = 0644,
5558 .proc_handler = proc_dointvec
5559 },
b800c3b9
HFS		 5560 {
5561 .procname = "suppress_frag_ndisc",
5562 .data = &ipv6_devconf.suppress_frag_ndisc,
5563 .maxlen = sizeof(int),
5564 .mode = 0644,
5565 .proc_handler = proc_dointvec
5566 },
d9333196
BG		 5567 {
5568 .procname = "accept_ra_from_local",
5569 .data = &ipv6_devconf.accept_ra_from_local,
5570 .maxlen = sizeof(int),
5571 .mode = 0644,
5572 .proc_handler = proc_dointvec,
5573 },
c2943f14
HH		 5574 {
5575 .procname = "accept_ra_mtu",
5576 .data = &ipv6_devconf.accept_ra_mtu,
5577 .maxlen = sizeof(int),
5578 .mode = 0644,
5579 .proc_handler = proc_dointvec,
5580 },
3d1bec99
HFS		 5581 {
5582 .procname = "stable_secret",
5583 .data = &ipv6_devconf.stable_secret,
5584 .maxlen = IPV6_MAX_STRLEN,
5585 .mode = 0600,
5586 .proc_handler = addrconf_sysctl_stable_secret,
5587 },
1da177e4 5588 {
f8572d8f 5589 /* sentinel */
1da177e4
LT		 5590 }
5591 },
1da177e4
LT		 5592};
5593
bff16c2f 5594static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 5595 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 5596{
5597 int i;
1da177e4 5598 struct addrconf_sysctl_table *t;
6105e293 5599 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 5600
af879cc7 5601 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 5602 if (t == NULL)
f68635e6
PE		 5603 goto out;
5604
bcdd553f 5605 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 5606 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 5607 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 5608 t->addrconf_vars[i].extra2 = net;
1da177e4 5609 }
1da177e4 5610
6105e293 5611 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 5612
6105e293 5613 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
1da177e4 5614 if (t->sysctl_header == NULL)
6105e293 5615 goto free;
f68635e6
PE		 5616
5617 p->sysctl = t;
95897312 5618 return 0;
1da177e4 5619
f68635e6 5620free:
1da177e4 5621 kfree(t);
f68635e6 5622out:
95897312 5623 return -ENOBUFS;
1da177e4
LT		 5624}
5625
408c4768
PE		 5626static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5627{
5628 struct addrconf_sysctl_table *t;
5629
5630 if (p->sysctl == NULL)
5631 return;
5632
5633 t = p->sysctl;
5634 p->sysctl = NULL;
ff538818 5635 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 5636 kfree(t);
5637}
5638
a317a2f1 5639static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 5640{
a317a2f1
WC		 5641 int err;
5642
5643 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5644 return -EINVAL;
5645
5646 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5647 &ndisc_ifinfo_sysctl_change);
5648 if (err)
5649 return err;
5650 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5651 idev, &idev->cnf);
5652 if (err)
5653 neigh_sysctl_unregister(idev->nd_parms);
5654
5655 return err;
f52295a9
PE		 5656}
5657
408c4768 5658static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 5659{
408c4768
PE		 5660 __addrconf_sysctl_unregister(&idev->cnf);
5661 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 5662}
5663
5664
5665#endif
5666
2c8c1e72 5667static int __net_init addrconf_init_net(struct net *net)
e0da5a48 5668{
a79ca223 5669 int err = -ENOMEM;
e0da5a48
PE		 5670 struct ipv6_devconf *all, *dflt;
5671
a79ca223
HZ		 5672 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5673 if (all == NULL)
5674 goto err_alloc_all;
e0da5a48 5675
a79ca223
HZ		 5676 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5677 if (dflt == NULL)
5678 goto err_alloc_dflt;
e0da5a48 5679
a79ca223
HZ		 5680 /* these will be inherited by all namespaces */
5681 dflt->autoconf = ipv6_defaults.autoconf;
5682 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 5683
3d1bec99
HFS		 5684 dflt->stable_secret.initialized = false;
5685 all->stable_secret.initialized = false;
5686
e0da5a48
PE		 5687 net->ipv6.devconf_all = all;
5688 net->ipv6.devconf_dflt = dflt;
5689
5690#ifdef CONFIG_SYSCTL
f8572d8f 5691 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 5692 if (err < 0)
5693 goto err_reg_all;
5694
f8572d8f 5695 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 5696 if (err < 0)
5697 goto err_reg_dflt;
5698#endif
5699 return 0;
5700
5701#ifdef CONFIG_SYSCTL
5702err_reg_dflt:
5703 __addrconf_sysctl_unregister(all);
5704err_reg_all:
5705 kfree(dflt);
5706#endif
5707err_alloc_dflt:
5708 kfree(all);
5709err_alloc_all:
5710 return err;
5711}
5712
2c8c1e72 5713static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 5714{
5715#ifdef CONFIG_SYSCTL
5716 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5717 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5718#endif
73cf0e92 5719 kfree(net->ipv6.devconf_dflt);
5720 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 5721}
5722
5723static struct pernet_operations addrconf_ops = {
5724 .init = addrconf_init_net,
5725 .exit = addrconf_exit_net,
5726};
5727
207895fd 5728static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 5729 .family = AF_INET6,
5730 .fill_link_af = inet6_fill_link_af,
5731 .get_link_af_size = inet6_get_link_af_size,
11b1f828 5732 .validate_link_af = inet6_validate_link_af,
f53adae4 5733 .set_link_af = inet6_set_link_af,
b382b191
TG		 5734};
5735
1da177e4
LT		 5736/*
5737 * Init / cleanup code
5738 */
5739
5740int __init addrconf_init(void)
5741{
a317a2f1 5742 struct inet6_dev *idev;
c2e21293 5743 int i, err;
2a8cc6c8 5744
e21e8467
SH		 5745 err = ipv6_addr_label_init();
5746 if (err < 0) {
f3213831
JP		 5747 pr_crit("%s: cannot initialize default policy table: %d\n",
5748 __func__, err);
2cc6d2bf 5749 goto out;
2a8cc6c8 5750 }
1da177e4 5751
2cc6d2bf
NH		 5752 err = register_pernet_subsys(&addrconf_ops);
5753 if (err < 0)
5754 goto out_addrlabel;
e0da5a48 5755
c15b1cca
HFS		 5756 addrconf_wq = create_workqueue("ipv6_addrconf");
5757 if (!addrconf_wq) {
5758 err = -ENOMEM;
5759 goto out_nowq;
5760 }
5761
1da177e4
LT		 5762 /* The addrconf netdev notifier requires that loopback_dev
5763 * has it's ipv6 private information allocated and setup
5764 * before it can bring up and give link-local addresses
5765 * to other devices which are up.
5766 *
5767 * Unfortunately, loopback_dev is not necessarily the first
5768 * entry in the global dev_base list of net devices. In fact,
5769 * it is likely to be the very last entry on that list.
5770 * So this causes the notifier registry below to try and
5771 * give link-local addresses to all devices besides loopback_dev
5772 * first, then loopback_dev, which cases all the non-loopback_dev
5773 * devices to fail to get a link-local address.
5774 *
5775 * So, as a temporary fix, allocate the ipv6 structure for
5776 * loopback_dev first by hand.
5777 * Longer term, all of the dependencies ipv6 has upon the loopback
5778 * device and it being up should be removed.
5779 */
5780 rtnl_lock();
a317a2f1 5781 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 5782 rtnl_unlock();
a317a2f1
WC		 5783 if (IS_ERR(idev)) {
5784 err = PTR_ERR(idev);
e0da5a48 5785 goto errlo;
a317a2f1 5786 }
1da177e4 5787
c2e21293 5788 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5789 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5790
1da177e4
LT		 5791 register_netdevice_notifier(&ipv6_dev_notf);
5792
c15b1cca 5793 addrconf_verify();
c127ea2c 5794
3678a9d8 5795 rtnl_af_register(&inet6_ops);
b382b191 5796
c7ac8679
GR		 5797 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5798 NULL);
c127ea2c
TG		 5799 if (err < 0)
5800 goto errout;
5801
5802 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 5803 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5804 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5805 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5806 inet6_dump_ifaddr, NULL);
5807 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5808 inet6_dump_ifmcaddr, NULL);
5809 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5810 inet6_dump_ifacaddr, NULL);
76f8f6cb 5811 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 5812 inet6_netconf_dump_devconf, NULL);
c127ea2c 5813
2a8cc6c8
YH		 5814 ipv6_addr_label_rtnl_register();
5815
1da177e4 5816 return 0;
c127ea2c 5817errout:
b382b191 5818 rtnl_af_unregister(&inet6_ops);
c127ea2c 5819 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5820errlo:
c15b1cca
HFS		 5821 destroy_workqueue(addrconf_wq);
5822out_nowq:
e0da5a48 5823 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 5824out_addrlabel:
5825 ipv6_addr_label_cleanup();
5826out:
c127ea2c 5827 return err;
1da177e4
LT		 5828}
5829
09f7709f 5830void addrconf_cleanup(void)
1da177e4 5831{
176c39af 5832 struct net_device *dev;
1da177e4
LT		 5833 int i;
5834
5835 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5836 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 5837 ipv6_addr_label_cleanup();
1da177e4
LT		 5838
5839 rtnl_lock();
5840
b382b191
TG		 5841 __rtnl_af_unregister(&inet6_ops);
5842
176c39af
DL		 5843 /* clean dev list */
5844 for_each_netdev(&init_net, dev) {
5845 if (__in6_dev_get(dev) == NULL)
5846 continue;
5847 addrconf_ifdown(dev, 1);
5848 }
5849 addrconf_ifdown(init_net.loopback_dev, 2);
5850
1da177e4
LT		 5851 /*
5852 * Check hash table.
5853 */
5c578aed 5854 spin_lock_bh(&addrconf_hash_lock);
c2e21293 5855 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5856 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 5857 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 5858 cancel_delayed_work(&addr_chk_work);
1da177e4 5859 rtnl_unlock();
c15b1cca
HFS		 5860
5861 destroy_workqueue(addrconf_wq);
1da177e4 5862}
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