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netfilter: bridge: reduce nf_bridge_info to 32 bytes again
[deliverable/linux.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
1da177e4
LT		 46#include <linux/socket.h>
47#include <linux/sockios.h>
1da177e4 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);
63159f29 337 if (!ndev)
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);
63159f29 349 if (!ndev->nd_parms) {
322f74a4 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);
63159f29 484 if (!nlh)
f3a1bfb1
ND		 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);
63159f29 522 if (!skb)
f3a1bfb1
ND		 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);
63159f29 577 if (!dev)
76f8f6cb
ND		 578 goto errout;
579 in6_dev = __in6_dev_get(dev);
63159f29 580 if (!in6_dev)
76f8f6cb
ND		 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);
63159f29 588 if (!skb)
76f8f6cb
ND		 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 856
63159f29 857 if (!ifa) {
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
9131f3de
YH		 1361static void __ipv6_dev_get_saddr(struct net *net,
1362 struct ipv6_saddr_dst *dst,
1363 unsigned int prefs,
1364 const struct in6_addr *saddr,
1365 struct inet6_dev *idev,
1366 struct ipv6_saddr_score *scores)
1367{
1368 struct ipv6_saddr_score *score = &scores[0], *hiscore = &scores[1];
1369
1370 read_lock_bh(&idev->lock);
1371 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1372 int i;
1373
1374 /*
1375 * - Tentative Address (RFC2462 section 5.4)
1376 * - A tentative address is not considered
1377 * "assigned to an interface" in the traditional
1378 * sense, unless it is also flagged as optimistic.
1379 * - Candidate Source Address (section 4)
1380 * - In any case, anycast addresses, multicast
1381 * addresses, and the unspecified address MUST
1382 * NOT be included in a candidate set.
1383 */
1384 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1385 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1386 continue;
1387
1388 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1389
1390 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1391 score->addr_type & IPV6_ADDR_MULTICAST)) {
1392 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1393 idev->dev->name);
1394 continue;
1395 }
1396
1397 score->rule = -1;
1398 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1399
1400 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1401 int minihiscore, miniscore;
1402
1403 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1404 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1405
1406 if (minihiscore > miniscore) {
1407 if (i == IPV6_SADDR_RULE_SCOPE &&
1408 score->scopedist > 0) {
1409 /*
1410 * special case:
1411 * each remaining entry
1412 * has too small (not enough)
1413 * scope, because ifa entries
1414 * are sorted by their scope
1415 * values.
1416 */
1417 goto out;
1418 }
1419 break;
1420 } else if (minihiscore < miniscore) {
1421 if (hiscore->ifa)
1422 in6_ifa_put(hiscore->ifa);
1423
1424 in6_ifa_hold(score->ifa);
1425
1426 swap(hiscore, score);
1427
1428 /* restore our iterator */
1429 score->ifa = hiscore->ifa;
1430
1431 break;
1432 }
1433 }
1434 }
1435out:
1436 read_unlock_bh(&idev->lock);
1437}
1438
b3f644fc 1439int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1440 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1441 struct in6_addr *saddr)
1da177e4 1442{
9131f3de 1443 struct ipv6_saddr_score scores[2], *hiscore = &scores[1];
a9b05723 1444 struct ipv6_saddr_dst dst;
9131f3de 1445 struct inet6_dev *idev;
072047e4 1446 struct net_device *dev;
a9b05723 1447 int dst_type;
9131f3de 1448 bool use_oif_addr = false;
1da177e4 1449
a9b05723
YH		 1450 dst_type = __ipv6_addr_type(daddr);
1451 dst.addr = daddr;
1452 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1453 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1454 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1455 dst.prefs = prefs;
a9b05723
YH		 1456
1457 hiscore->rule = -1;
1458 hiscore->ifa = NULL;
1da177e4 1459
8814c4b5 1460 rcu_read_lock();
1da177e4 1461
9131f3de
YH		 1462 /* Candidate Source Address (section 4)
1463 * - multicast and link-local destination address,
1464 * the set of candidate source address MUST only
1465 * include addresses assigned to interfaces
1466 * belonging to the same link as the outgoing
1467 * interface.
1468 * (- For site-local destination addresses, the
1469 * set of candidate source addresses MUST only
1470 * include addresses assigned to interfaces
1471 * belonging to the same site as the outgoing
1472 * interface.)
1473 */
1474 if (dst_dev) {
1475 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1476 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) {
1477 idev = __in6_dev_get(dst_dev);
1478 use_oif_addr = true;
1479 }
1480 }
a9b05723 1481
9131f3de
YH		 1482 if (use_oif_addr) {
1483 __ipv6_dev_get_saddr(net, &dst, prefs, saddr, idev, scores);
1484 } else {
1485 for_each_netdev_rcu(net, dev) {
1486 idev = __in6_dev_get(dev);
1487 if (!idev)
072047e4 1488 continue;
9131f3de 1489 __ipv6_dev_get_saddr(net, &dst, prefs, saddr, idev, scores);
1da177e4
LT		 1490 }
1491 }
8814c4b5 1492 rcu_read_unlock();
1da177e4 1493
a9b05723 1494 if (!hiscore->ifa)
072047e4 1495 return -EADDRNOTAVAIL;
1ab1457c 1496
4e3fd7a0 1497 *saddr = hiscore->ifa->addr;
a9b05723 1498 in6_ifa_put(hiscore->ifa);
072047e4 1499 return 0;
1da177e4 1500}
5e5f3f0f 1501EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1502
8965779d 1503int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1504 u32 banned_flags)
b7b1bfce
HFS		 1505{
1506 struct inet6_ifaddr *ifp;
1507 int err = -EADDRNOTAVAIL;
1508
602582ca
HFS		 1509 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1510 if (ifp->scope > IFA_LINK)
1511 break;
b7b1bfce
HFS		 1512 if (ifp->scope == IFA_LINK &&
1513 !(ifp->flags & banned_flags)) {
1514 *addr = ifp->addr;
1515 err = 0;
1516 break;
1517 }
1518 }
1519 return err;
1520}
1521
95c385b4 1522int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1523 u32 banned_flags)
1da177e4
LT		 1524{
1525 struct inet6_dev *idev;
1526 int err = -EADDRNOTAVAIL;
1527
8814c4b5 1528 rcu_read_lock();
e21e8467
SH		 1529 idev = __in6_dev_get(dev);
1530 if (idev) {
1da177e4 1531 read_lock_bh(&idev->lock);
b7b1bfce 1532 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1533 read_unlock_bh(&idev->lock);
1534 }
8814c4b5 1535 rcu_read_unlock();
1da177e4
LT		 1536 return err;
1537}
1538
1539static int ipv6_count_addresses(struct inet6_dev *idev)
1540{
1541 int cnt = 0;
1542 struct inet6_ifaddr *ifp;
1543
1544 read_lock_bh(&idev->lock);
502a2ffd 1545 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1546 cnt++;
1547 read_unlock_bh(&idev->lock);
1548 return cnt;
1549}
1550
b71d1d42 1551int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1552 const struct net_device *dev, int strict)
c58da4c6
EK		 1553{
1554 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1555}
1556EXPORT_SYMBOL(ipv6_chk_addr);
1557
1558int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1559 const struct net_device *dev, int strict,
1560 u32 banned_flags)
1da177e4 1561{
eedf042a 1562 struct inet6_ifaddr *ifp;
ddbe5032 1563 unsigned int hash = inet6_addr_hash(addr);
c58da4c6 1564 u32 ifp_flags;
1da177e4 1565
5c578aed 1566 rcu_read_lock_bh();
b67bfe0d 1567 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1568 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1569 continue;
c58da4c6
EK		 1570 /* Decouple optimistic from tentative for evaluation here.
1571 * Ban optimistic addresses explicitly, when required.
1572 */
1573 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1574 ? (ifp->flags&~IFA_F_TENTATIVE)
1575 : ifp->flags;
1da177e4 1576 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1577 !(ifp_flags&banned_flags) &&
63159f29 1578 (!dev || ifp->idev->dev == dev ||
eedf042a
SH		 1579 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1580 rcu_read_unlock_bh();
1581 return 1;
1da177e4
LT		 1582 }
1583 }
5c578aed 1584
eedf042a
SH		 1585 rcu_read_unlock_bh();
1586 return 0;
1da177e4 1587}
c58da4c6 1588EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1589
3e81c6da
DM		 1590static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1591 struct net_device *dev)
1da177e4 1592{
ddbe5032 1593 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1594 struct inet6_ifaddr *ifp;
1da177e4 1595
b67bfe0d 1596 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1597 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1598 continue;
1da177e4 1599 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1600 if (!dev || ifp->idev->dev == dev)
3e81c6da 1601 return true;
1da177e4
LT		 1602 }
1603 }
3e81c6da 1604 return false;
1da177e4
LT		 1605}
1606
7df37ff3
CB		 1607/* Compares an address/prefix_len with addresses on device @dev.
1608 * If one is found it returns true.
1609 */
1610bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1611 const unsigned int prefix_len, struct net_device *dev)
1612{
1613 struct inet6_dev *idev;
1614 struct inet6_ifaddr *ifa;
1615 bool ret = false;
1616
1617 rcu_read_lock();
1618 idev = __in6_dev_get(dev);
1619 if (idev) {
1620 read_lock_bh(&idev->lock);
1621 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1622 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1623 if (ret)
1624 break;
1625 }
1626 read_unlock_bh(&idev->lock);
1627 }
1628 rcu_read_unlock();
1629
1630 return ret;
1631}
1632EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1633
b71d1d42 1634int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1635{
1636 struct inet6_dev *idev;
1637 struct inet6_ifaddr *ifa;
1638 int onlink;
1639
1640 onlink = 0;
1641 rcu_read_lock();
1642 idev = __in6_dev_get(dev);
1643 if (idev) {
1644 read_lock_bh(&idev->lock);
502a2ffd 1645 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1646 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1647 ifa->prefix_len);
1648 if (onlink)
1649 break;
1650 }
1651 read_unlock_bh(&idev->lock);
1652 }
1653 rcu_read_unlock();
1654 return onlink;
1655}
52eeeb84
YH		 1656EXPORT_SYMBOL(ipv6_chk_prefix);
1657
9acd9f3a 1658struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1659 struct net_device *dev, int strict)
1da177e4 1660{
b79d1d54 1661 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1662 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1663
5c578aed 1664 rcu_read_lock_bh();
b67bfe0d 1665 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1666 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1667 continue;
1da177e4 1668 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1669 if (!dev || ifp->idev->dev == dev ||
1da177e4 1670 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1671 result = ifp;
1da177e4
LT		 1672 in6_ifa_hold(ifp);
1673 break;
1674 }
1675 }
1676 }
5c578aed 1677 rcu_read_unlock_bh();
1da177e4 1678
b79d1d54 1679 return result;
1da177e4
LT		 1680}
1681
1da177e4
LT		 1682/* Gets referenced address, destroys ifaddr */
1683
cc411d0b 1684static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1685{
1da177e4
LT		 1686 if (ifp->flags&IFA_F_PERMANENT) {
1687 spin_lock_bh(&ifp->lock);
c15b1cca 1688 addrconf_del_dad_work(ifp);
1da177e4 1689 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1690 if (dad_failed)
1691 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1692 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1693 if (dad_failed)
1694 ipv6_ifa_notify(0, ifp);
1da177e4 1695 in6_ifa_put(ifp);
1da177e4
LT		 1696 } else if (ifp->flags&IFA_F_TEMPORARY) {
1697 struct inet6_ifaddr *ifpub;
1698 spin_lock_bh(&ifp->lock);
1699 ifpub = ifp->ifpub;
1700 if (ifpub) {
1701 in6_ifa_hold(ifpub);
1702 spin_unlock_bh(&ifp->lock);
1703 ipv6_create_tempaddr(ifpub, ifp);
1704 in6_ifa_put(ifpub);
1705 } else {
1706 spin_unlock_bh(&ifp->lock);
1707 }
1708 ipv6_del_addr(ifp);
c15b1cca 1709 } else {
1da177e4 1710 ipv6_del_addr(ifp);
c15b1cca 1711 }
1da177e4
LT		 1712}
1713
f2344a13
HX		 1714static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1715{
1716 int err = -ENOENT;
1717
8e8e676d 1718 spin_lock_bh(&ifp->lock);
f2344a13
HX		 1719 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1720 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1721 err = 0;
1722 }
8e8e676d 1723 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 1724
1725 return err;
1726}
1727
3c21edbd
YH		 1728void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1729{
5f40ef77 1730 struct in6_addr addr;
1b34be74 1731 struct inet6_dev *idev = ifp->idev;
1855b7c3 1732 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 1733
853dc2e0
UB		 1734 if (addrconf_dad_end(ifp)) {
1735 in6_ifa_put(ifp);
f2344a13 1736 return;
853dc2e0 1737 }
f2344a13 1738
e87cc472
JP		 1739 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1740 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1741
5f40ef77
HFS		 1742 spin_lock_bh(&ifp->lock);
1743
1744 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1745 int scope = ifp->scope;
1746 u32 flags = ifp->flags;
1747 struct in6_addr new_addr;
1748 struct inet6_ifaddr *ifp2;
1749 u32 valid_lft, preferred_lft;
1750 int pfxlen = ifp->prefix_len;
5f40ef77
HFS		 1751 int retries = ifp->stable_privacy_retry + 1;
1752
1855b7c3 1753 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 1754 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1755 ifp->idev->dev->name);
1756 goto errdad;
1757 }
1758
1759 new_addr = ifp->addr;
1760 if (ipv6_generate_stable_address(&new_addr, retries,
1761 idev))
1762 goto errdad;
1763
1764 valid_lft = ifp->valid_lft;
1765 preferred_lft = ifp->prefered_lft;
1766
1767 spin_unlock_bh(&ifp->lock);
1b34be74 1768
5f40ef77
HFS		 1769 if (idev->cnf.max_addresses &&
1770 ipv6_count_addresses(idev) >=
1771 idev->cnf.max_addresses)
1772 goto lock_errdad;
1773
1774 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1775 ifp->idev->dev->name);
1776
1777 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1778 scope, flags, valid_lft,
1779 preferred_lft);
1780 if (IS_ERR(ifp2))
1781 goto lock_errdad;
1782
1783 spin_lock_bh(&ifp2->lock);
1784 ifp2->stable_privacy_retry = retries;
1785 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1786 spin_unlock_bh(&ifp2->lock);
1787
1855b7c3 1788 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 1789 in6_ifa_put(ifp2);
1790lock_errdad:
1791 spin_lock_bh(&ifp->lock);
1792 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1b34be74
YH		 1793 addr.s6_addr32[0] = htonl(0xfe800000);
1794 addr.s6_addr32[1] = 0;
1795
1796 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1797 ipv6_addr_equal(&ifp->addr, &addr)) {
1798 /* DAD failed for link-local based on MAC address */
1799 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1800
f3213831 1801 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1802 ifp->idev->dev->name);
1b34be74
YH		 1803 }
1804 }
1805
5f40ef77 1806errdad:
c15b1cca
HFS		 1807 /* transition from _POSTDAD to _ERRDAD */
1808 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 1809 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 1810
1811 addrconf_mod_dad_work(ifp, 0);
3c21edbd 1812}
1da177e4 1813
a9ed4a29
SD		 1814/* Join to solicited addr multicast group.
1815 * caller must hold RTNL */
b71d1d42 1816void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1817{
1818 struct in6_addr maddr;
1819
1820 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1821 return;
1822
1823 addrconf_addr_solict_mult(addr, &maddr);
1824 ipv6_dev_mc_inc(dev, &maddr);
1825}
1826
a9ed4a29 1827/* caller must hold RTNL */
b71d1d42 1828void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1829{
1830 struct in6_addr maddr;
1831
1832 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1833 return;
1834
1835 addrconf_addr_solict_mult(addr, &maddr);
1836 __ipv6_dev_mc_dec(idev, &maddr);
1837}
1838
a9ed4a29 1839/* caller must hold RTNL */
20380731 1840static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1841{
1842 struct in6_addr addr;
c15b1cca 1843
88ad3149 1844 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 1845 return;
1da177e4
LT		 1846 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1847 if (ipv6_addr_any(&addr))
1848 return;
013b4d90 1849 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 1850}
1851
a9ed4a29 1852/* caller must hold RTNL */
20380731 1853static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1854{
1855 struct in6_addr addr;
c15b1cca 1856
88ad3149 1857 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 1858 return;
1da177e4
LT		 1859 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1860 if (ipv6_addr_any(&addr))
1861 return;
1862 __ipv6_dev_ac_dec(ifp->idev, &addr);
1863}
1864
073a8e0e
YH		 1865static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1866{
1867 if (dev->addr_len != ETH_ALEN)
1868 return -1;
1869 memcpy(eui, dev->dev_addr, 3);
1870 memcpy(eui + 5, dev->dev_addr + 3, 3);
1871
1872 /*
1873 * The zSeries OSA network cards can be shared among various
1874 * OS instances, but the OSA cards have only one MAC address.
1875 * This leads to duplicate address conflicts in conjunction
1876 * with IPv6 if more than one instance uses the same card.
1877 *
1878 * The driver for these cards can deliver a unique 16-bit
1879 * identifier for each instance sharing the same card. It is
1880 * placed instead of 0xFFFE in the interface identifier. The
1881 * "u" bit of the interface identifier is not inverted in this
1882 * case. Hence the resulting interface identifier has local
1883 * scope according to RFC2373.
1884 */
1885 if (dev->dev_id) {
1886 eui[3] = (dev->dev_id >> 8) & 0xFF;
1887 eui[4] = dev->dev_id & 0xFF;
1888 } else {
1889 eui[3] = 0xFF;
1890 eui[4] = 0xFE;
1891 eui[0] ^= 2;
1892 }
1893 return 0;
1894}
1895
06a4c1c5 1896static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1897{
1898 if (dev->addr_len != IEEE802154_ADDR_LEN)
1899 return -1;
1900 memcpy(eui, dev->dev_addr, 8);
5e98a36e 1901 eui[0] ^= 2;
06a4c1c5 1902 return 0;
1903}
1904
cb6bf355
YH		 1905static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1906{
1907 union fwnet_hwaddr *ha;
1908
1909 if (dev->addr_len != FWNET_ALEN)
1910 return -1;
1911
1912 ha = (union fwnet_hwaddr *)dev->dev_addr;
1913
1914 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1915 eui[0] ^= 2;
1916 return 0;
1917}
1918
073a8e0e
YH		 1919static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1920{
1921 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1922 if (dev->addr_len != ARCNET_ALEN)
1923 return -1;
1924 memset(eui, 0, 7);
8e5e8f30 1925 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1926 return 0;
1927}
1928
1929static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1930{
1931 if (dev->addr_len != INFINIBAND_ALEN)
1932 return -1;
1933 memcpy(eui, dev->dev_addr + 12, 8);
1934 eui[0] |= 2;
1935 return 0;
1936}
1937
c61393ea 1938static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1939{
9af28511
SH		 1940 if (addr == 0)
1941 return -1;
dfd982ba
YH		 1942 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1943 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1944 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1945 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1946 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1947 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1948 eui[1] = 0;
1949 eui[2] = 0x5E;
1950 eui[3] = 0xFE;
1951 memcpy(eui + 4, &addr, 4);
1952 return 0;
1953}
dfd982ba
YH		 1954
1955static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1956{
1957 if (dev->priv_flags & IFF_ISATAP)
1958 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1959 return -1;
1960}
1961
aee80b54 1962static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1963{
1964 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1965}
1966
e837735e
ND		 1967static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1968{
1969 memcpy(eui, dev->perm_addr, 3);
1970 memcpy(eui + 5, dev->perm_addr + 3, 3);
1971 eui[3] = 0xFF;
1972 eui[4] = 0xFE;
1973 eui[0] ^= 2;
1974 return 0;
1975}
1976
1da177e4
LT		 1977static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1978{
1979 switch (dev->type) {
1980 case ARPHRD_ETHER:
1981 case ARPHRD_FDDI:
073a8e0e 1982 return addrconf_ifid_eui48(eui, dev);
1da177e4 1983 case ARPHRD_ARCNET:
073a8e0e 1984 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1985 case ARPHRD_INFINIBAND:
073a8e0e 1986 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1987 case ARPHRD_SIT:
dfd982ba 1988 return addrconf_ifid_sit(eui, dev);
aee80b54 1989 case ARPHRD_IPGRE:
1990 return addrconf_ifid_gre(eui, dev);
e74bccb8 1991 case ARPHRD_6LOWPAN:
06a4c1c5 1992 case ARPHRD_IEEE802154:
1993 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 1994 case ARPHRD_IEEE1394:
1995 return addrconf_ifid_ieee1394(eui, dev);
e837735e
ND		 1996 case ARPHRD_TUNNEL6:
1997 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 1998 }
1999 return -1;
2000}
2001
2002static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2003{
2004 int err = -1;
2005 struct inet6_ifaddr *ifp;
2006
2007 read_lock_bh(&idev->lock);
602582ca
HFS		 2008 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2009 if (ifp->scope > IFA_LINK)
2010 break;
1da177e4
LT		 2011 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2012 memcpy(eui, ifp->addr.s6_addr+8, 8);
2013 err = 0;
2014 break;
2015 }
2016 }
2017 read_unlock_bh(&idev->lock);
2018 return err;
2019}
2020
1da177e4 2021/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 2022static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2023{
1da177e4 2024regen:
955189ef 2025 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2026 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2027
2028 /*
2029 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2030 * check if generated address is not inappropriate
2031 *
2032 * - Reserved subnet anycast (RFC 2526)
2033 * 11111101 11....11 1xxxxxxx
c7dc89c0 2034 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2035 * 00-00-5E-FE-xx-xx-xx-xx
2036 * - value 0
2037 * - XXX: already assigned to an address on the device
2038 */
1ab1457c 2039 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2040 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2041 (idev->rndid[7]&0x80))
2042 goto regen;
2043 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2044 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2045 goto regen;
2046 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2047 goto regen;
2048 }
1da177e4
LT		 2049}
2050
2051static void ipv6_regen_rndid(unsigned long data)
2052{
2053 struct inet6_dev *idev = (struct inet6_dev *) data;
2054 unsigned long expires;
2055
8814c4b5 2056 rcu_read_lock_bh();
1da177e4
LT		 2057 write_lock_bh(&idev->lock);
2058
2059 if (idev->dead)
2060 goto out;
2061
eb7e0575 2062 __ipv6_regen_rndid(idev);
1ab1457c 2063
1da177e4 2064 expires = jiffies +
1ab1457c 2065 idev->cnf.temp_prefered_lft * HZ -
1f9248e5
JP		 2066 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2067 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
784e2710 2068 idev->cnf.max_desync_factor * HZ;
1da177e4 2069 if (time_before(expires, jiffies)) {
f3213831
JP		 2070 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2071 __func__, idev->dev->name);
1da177e4
LT		 2072 goto out;
2073 }
2074
2075 if (!mod_timer(&idev->regen_timer, expires))
2076 in6_dev_hold(idev);
2077
2078out:
2079 write_unlock_bh(&idev->lock);
8814c4b5 2080 rcu_read_unlock_bh();
1da177e4
LT		 2081 in6_dev_put(idev);
2082}
2083
eb7e0575 2084static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2085{
1da177e4 2086 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 2087 __ipv6_regen_rndid(idev);
1da177e4 2088}
1da177e4
LT		 2089
2090/*
2091 * Add prefix route.
2092 */
2093
2094static void
2095addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2096 unsigned long expires, u32 flags)
1da177e4 2097{
86872cb5
TG		 2098 struct fib6_config cfg = {
2099 .fc_table = RT6_TABLE_PREFIX,
2100 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2101 .fc_ifindex = dev->ifindex,
2102 .fc_expires = expires,
2103 .fc_dst_len = plen,
2104 .fc_flags = RTF_UP | flags,
c346dca1 2105 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2106 .fc_protocol = RTPROT_KERNEL,
86872cb5 2107 };
1da177e4 2108
4e3fd7a0 2109 cfg.fc_dst = *pfx;
1da177e4
LT		 2110
2111 /* Prevent useless cloning on PtP SIT.
2112 This thing is done here expecting that the whole
2113 class of non-broadcast devices need not cloning.
2114 */
07a93626 2115#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2116 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2117 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2118#endif
1da177e4 2119
86872cb5 2120 ip6_route_add(&cfg);
1da177e4
LT		 2121}
2122
14ef37b6
AH		 2123
2124static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2125 int plen,
2126 const struct net_device *dev,
2127 u32 flags, u32 noflags)
2128{
2129 struct fib6_node *fn;
2130 struct rt6_info *rt = NULL;
2131 struct fib6_table *table;
2132
2133 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
63159f29 2134 if (!table)
14ef37b6
AH		 2135 return NULL;
2136
5744dd9b 2137 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2138 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2139 if (!fn)
2140 goto out;
1f56a01f
MKL		 2141
2142 noflags |= RTF_CACHE;
14ef37b6 2143 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2144 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2145 continue;
2146 if ((rt->rt6i_flags & flags) != flags)
2147 continue;
85da53bf 2148 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2149 continue;
2150 dst_hold(&rt->dst);
2151 break;
2152 }
2153out:
5744dd9b 2154 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2155 return rt;
2156}
2157
2158
1da177e4
LT		 2159/* Create "default" multicast route to the interface */
2160
2161static void addrconf_add_mroute(struct net_device *dev)
2162{
86872cb5
TG		 2163 struct fib6_config cfg = {
2164 .fc_table = RT6_TABLE_LOCAL,
2165 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2166 .fc_ifindex = dev->ifindex,
2167 .fc_dst_len = 8,
2168 .fc_flags = RTF_UP,
c346dca1 2169 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2170 };
2171
2172 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2173
2174 ip6_route_add(&cfg);
1da177e4
LT		 2175}
2176
1da177e4
LT		 2177static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2178{
2179 struct inet6_dev *idev;
2180
2181 ASSERT_RTNL();
2182
e21e8467
SH		 2183 idev = ipv6_find_idev(dev);
2184 if (!idev)
64e724f6
BH		 2185 return ERR_PTR(-ENOBUFS);
2186
2187 if (idev->cnf.disable_ipv6)
2188 return ERR_PTR(-EACCES);
1da177e4
LT		 2189
2190 /* Add default multicast route */
4af04aba
LW		 2191 if (!(dev->flags & IFF_LOOPBACK))
2192 addrconf_add_mroute(dev);
1da177e4 2193
1da177e4
LT		 2194 return idev;
2195}
2196
53bd6749
JP		 2197static void manage_tempaddrs(struct inet6_dev *idev,
2198 struct inet6_ifaddr *ifp,
2199 __u32 valid_lft, __u32 prefered_lft,
2200 bool create, unsigned long now)
2201{
2202 u32 flags;
2203 struct inet6_ifaddr *ift;
2204
2205 read_lock_bh(&idev->lock);
2206 /* update all temporary addresses in the list */
2207 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2208 int age, max_valid, max_prefered;
2209
2210 if (ifp != ift->ifpub)
2211 continue;
2212
2213 /* RFC 4941 section 3.3:
2214 * If a received option will extend the lifetime of a public
2215 * address, the lifetimes of temporary addresses should
2216 * be extended, subject to the overall constraint that no
2217 * temporary addresses should ever remain "valid" or "preferred"
2218 * for a time longer than (TEMP_VALID_LIFETIME) or
2219 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2220 */
2221 age = (now - ift->cstamp) / HZ;
2222 max_valid = idev->cnf.temp_valid_lft - age;
2223 if (max_valid < 0)
2224 max_valid = 0;
2225
2226 max_prefered = idev->cnf.temp_prefered_lft -
2227 idev->cnf.max_desync_factor - age;
2228 if (max_prefered < 0)
2229 max_prefered = 0;
2230
2231 if (valid_lft > max_valid)
2232 valid_lft = max_valid;
2233
2234 if (prefered_lft > max_prefered)
2235 prefered_lft = max_prefered;
2236
2237 spin_lock(&ift->lock);
2238 flags = ift->flags;
2239 ift->valid_lft = valid_lft;
2240 ift->prefered_lft = prefered_lft;
2241 ift->tstamp = now;
2242 if (prefered_lft > 0)
2243 ift->flags &= ~IFA_F_DEPRECATED;
2244
2245 spin_unlock(&ift->lock);
2246 if (!(flags&IFA_F_TENTATIVE))
2247 ipv6_ifa_notify(0, ift);
2248 }
2249
2250 if ((create || list_empty(&idev->tempaddr_list)) &&
2251 idev->cnf.use_tempaddr > 0) {
2252 /* When a new public address is created as described
2253 * in [ADDRCONF], also create a new temporary address.
2254 * Also create a temporary address if it's enabled but
2255 * no temporary address currently exists.
2256 */
2257 read_unlock_bh(&idev->lock);
2258 ipv6_create_tempaddr(ifp, NULL);
2259 } else {
2260 read_unlock_bh(&idev->lock);
2261 }
2262}
2263
e6bff995 2264void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2265{
2266 struct prefix_info *pinfo;
2267 __u32 valid_lft;
2268 __u32 prefered_lft;
2269 int addr_type;
64236f3f 2270 u32 addr_flags = 0;
1da177e4 2271 struct inet6_dev *in6_dev;
56d417b1 2272 struct net *net = dev_net(dev);
1da177e4
LT		 2273
2274 pinfo = (struct prefix_info *) opt;
1ab1457c 2275
1da177e4 2276 if (len < sizeof(struct prefix_info)) {
ba3542e1 2277 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2278 return;
2279 }
1ab1457c 2280
1da177e4
LT		 2281 /*
2282 * Validation checks ([ADDRCONF], page 19)
2283 */
2284
2285 addr_type = ipv6_addr_type(&pinfo->prefix);
2286
2287 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2288 return;
2289
2290 valid_lft = ntohl(pinfo->valid);
2291 prefered_lft = ntohl(pinfo->prefered);
2292
2293 if (prefered_lft > valid_lft) {
e87cc472 2294 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2295 return;
2296 }
2297
2298 in6_dev = in6_dev_get(dev);
2299
63159f29 2300 if (!in6_dev) {
e87cc472
JP		 2301 net_dbg_ratelimited("addrconf: device %s not configured\n",
2302 dev->name);
1da177e4
LT		 2303 return;
2304 }
2305
2306 /*
2307 * Two things going on here:
2308 * 1) Add routes for on-link prefixes
2309 * 2) Configure prefixes with the auto flag set
2310 */
2311
4bed72e4
YH		 2312 if (pinfo->onlink) {
2313 struct rt6_info *rt;
2314 unsigned long rt_expires;
2315
6f704992
YH		 2316 /* Avoid arithmetic overflow. Really, we could
2317 * save rt_expires in seconds, likely valid_lft,
2318 * but it would require division in fib gc, that it
2319 * not good.
2320 */
4bed72e4
YH		 2321 if (HZ > USER_HZ)
2322 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2323 else
2324 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2325
4bed72e4
YH		 2326 if (addrconf_finite_timeout(rt_expires))
2327 rt_expires *= HZ;
1da177e4 2328
14ef37b6
AH		 2329 rt = addrconf_get_prefix_route(&pinfo->prefix,
2330 pinfo->prefix_len,
2331 dev,
2332 RTF_ADDRCONF | RTF_PREFIX_RT,
2333 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2334
14ef37b6 2335 if (rt) {
6f704992
YH		 2336 /* Autoconf prefix route */
2337 if (valid_lft == 0) {
2338 ip6_del_rt(rt);
2339 rt = NULL;
4bed72e4 2340 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2341 /* not infinity */
1716a961 2342 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2343 } else {
1716a961 2344 rt6_clean_expires(rt);
1da177e4
LT		 2345 }
2346 } else if (valid_lft) {
6f704992 2347 clock_t expires = 0;
4bed72e4
YH		 2348 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2349 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2350 /* not infinity */
2351 flags |= RTF_EXPIRES;
2352 expires = jiffies_to_clock_t(rt_expires);
2353 }
1da177e4 2354 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2355 dev, expires, flags);
1da177e4 2356 }
94e187c0 2357 ip6_rt_put(rt);
1da177e4
LT		 2358 }
2359
2360 /* Try to figure out our local address for this prefix */
2361
2362 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2363 struct inet6_ifaddr *ifp;
1da177e4
LT		 2364 struct in6_addr addr;
2365 int create = 0, update_lft = 0;
617fe29d 2366 bool tokenized = false;
1da177e4
LT		 2367
2368 if (pinfo->prefix_len == 64) {
2369 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2370
2371 if (!ipv6_addr_any(&in6_dev->token)) {
2372 read_lock_bh(&in6_dev->lock);
2373 memcpy(addr.s6_addr + 8,
2374 in6_dev->token.s6_addr + 8, 8);
2375 read_unlock_bh(&in6_dev->lock);
617fe29d 2376 tokenized = true;
622c81d5
HFS		 2377 } else if (in6_dev->addr_gen_mode ==
2378 IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
2379 !ipv6_generate_stable_address(&addr, 0,
2380 in6_dev)) {
64236f3f 2381 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2382 goto ok;
f53adae4
DB		 2383 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2384 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1da177e4
LT		 2385 in6_dev_put(in6_dev);
2386 return;
2387 }
2388 goto ok;
2389 }
e87cc472
JP		 2390 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2391 pinfo->prefix_len);
1da177e4
LT		 2392 in6_dev_put(in6_dev);
2393 return;
2394
2395ok:
2396
53b7997f 2397 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4 2398
63159f29 2399 if (!ifp && valid_lft) {
1da177e4 2400 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2401
2402#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2403 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2404 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 2405 addr_flags = IFA_F_OPTIMISTIC;
2406#endif
1da177e4
LT		 2407
2408 /* Do not allow to create too much of autoconfigured
2409 * addresses; this would be too easy way to crash kernel.
2410 */
2411 if (!max_addresses ||
2412 ipv6_count_addresses(in6_dev) < max_addresses)
3f8f5298
JP		 2413 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2414 pinfo->prefix_len,
95c385b4 2415 addr_type&IPV6_ADDR_SCOPE_MASK,
8a226b2c
JB		 2416 addr_flags, valid_lft,
2417 prefered_lft);
1da177e4 2418
3f0d2ba0 2419 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2420 in6_dev_put(in6_dev);
2421 return;
2422 }
2423
8a226b2c
JB		 2424 update_lft = 0;
2425 create = 1;
c15b1cca
HFS		 2426 spin_lock_bh(&ifp->lock);
2427 ifp->flags |= IFA_F_MANAGETEMPADDR;
1da177e4 2428 ifp->cstamp = jiffies;
617fe29d 2429 ifp->tokenized = tokenized;
c15b1cca 2430 spin_unlock_bh(&ifp->lock);
cf22f9a2 2431 addrconf_dad_start(ifp);
1da177e4
LT		 2432 }
2433
2434 if (ifp) {
479840ff 2435 u32 flags;
1da177e4 2436 unsigned long now;
1da177e4
LT		 2437 u32 stored_lft;
2438
2439 /* update lifetime (RFC2462 5.5.3 e) */
8e8e676d 2440 spin_lock_bh(&ifp->lock);
1da177e4
LT		 2441 now = jiffies;
2442 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2443 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2444 else
2445 stored_lft = 0;
8a226b2c 2446 if (!update_lft && !create && stored_lft) {
9451a304
FF		 2447 const u32 minimum_lft = min_t(u32,
2448 stored_lft, MIN_VALID_LIFETIME);
c9d55d5b
PM		 2449 valid_lft = max(valid_lft, minimum_lft);
2450
2451 /* RFC4862 Section 5.5.3e:
2452 * "Note that the preferred lifetime of the
2453 * corresponding address is always reset to
2454 * the Preferred Lifetime in the received
2455 * Prefix Information option, regardless of
2456 * whether the valid lifetime is also reset or
2457 * ignored."
2458 *
2459 * So we should always update prefered_lft here.
2460 */
2461 update_lft = 1;
1da177e4
LT		 2462 }
2463
2464 if (update_lft) {
2465 ifp->valid_lft = valid_lft;
2466 ifp->prefered_lft = prefered_lft;
2467 ifp->tstamp = now;
2468 flags = ifp->flags;
2469 ifp->flags &= ~IFA_F_DEPRECATED;
8e8e676d 2470 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2471
2472 if (!(flags&IFA_F_TENTATIVE))
2473 ipv6_ifa_notify(0, ifp);
2474 } else
8e8e676d 2475 spin_unlock_bh(&ifp->lock);
1da177e4 2476
53bd6749
JP		 2477 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2478 create, now);
5d9efa7e 2479
1da177e4 2480 in6_ifa_put(ifp);
c15b1cca 2481 addrconf_verify();
1da177e4
LT		 2482 }
2483 }
2484 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2485 in6_dev_put(in6_dev);
2486}
2487
2488/*
2489 * Set destination address.
2490 * Special case for SIT interfaces where we create a new "virtual"
2491 * device.
2492 */
af284937 2493int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2494{
2495 struct in6_ifreq ireq;
2496 struct net_device *dev;
2497 int err = -EINVAL;
2498
2499 rtnl_lock();
2500
2501 err = -EFAULT;
2502 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2503 goto err_exit;
2504
af284937 2505 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2506
2507 err = -ENODEV;
63159f29 2508 if (!dev)
1da177e4
LT		 2509 goto err_exit;
2510
07a93626 2511#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2512 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2513 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2514 struct ifreq ifr;
1da177e4
LT		 2515 struct ip_tunnel_parm p;
2516
2517 err = -EADDRNOTAVAIL;
2518 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2519 goto err_exit;
2520
2521 memset(&p, 0, sizeof(p));
2522 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2523 p.iph.saddr = 0;
2524 p.iph.version = 4;
2525 p.iph.ihl = 5;
2526 p.iph.protocol = IPPROTO_IPV6;
2527 p.iph.ttl = 64;
d20b3109 2528 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2529
5bc3eb7e
SH		 2530 if (ops->ndo_do_ioctl) {
2531 mm_segment_t oldfs = get_fs();
2532
2533 set_fs(KERNEL_DS);
2534 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2535 set_fs(oldfs);
2536 } else
2537 err = -EOPNOTSUPP;
1da177e4
LT		 2538
2539 if (err == 0) {
2540 err = -ENOBUFS;
af284937
DL		 2541 dev = __dev_get_by_name(net, p.name);
2542 if (!dev)
1da177e4
LT		 2543 goto err_exit;
2544 err = dev_open(dev);
2545 }
2546 }
0be669bb 2547#endif
1da177e4
LT		 2548
2549err_exit:
2550 rtnl_unlock();
2551 return err;
2552}
2553
93a714d6
MC		 2554static int ipv6_mc_config(struct sock *sk, bool join,
2555 const struct in6_addr *addr, int ifindex)
2556{
2557 int ret;
2558
2559 ASSERT_RTNL();
2560
2561 lock_sock(sk);
2562 if (join)
54ff9ef3 2563 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2564 else
54ff9ef3 2565 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2566 release_sock(sk);
2567
2568 return ret;
2569}
2570
1da177e4
LT		 2571/*
2572 * Manual configuration of address on an interface
2573 */
479840ff
JP		 2574static int inet6_addr_add(struct net *net, int ifindex,
2575 const struct in6_addr *pfx,
caeaba79 2576 const struct in6_addr *peer_pfx,
479840ff
JP		 2577 unsigned int plen, __u32 ifa_flags,
2578 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2579{
2580 struct inet6_ifaddr *ifp;
2581 struct inet6_dev *idev;
2582 struct net_device *dev;
93a714d6
MC		 2583 unsigned long timeout;
2584 clock_t expires;
1da177e4 2585 int scope;
6f704992 2586 u32 flags;
1da177e4
LT		 2587
2588 ASSERT_RTNL();
1ab1457c 2589
24ef0da7
TG		 2590 if (plen > 128)
2591 return -EINVAL;
2592
0778769d
NT		 2593 /* check the lifetime */
2594 if (!valid_lft || prefered_lft > valid_lft)
2595 return -EINVAL;
2596
53bd6749
JP		 2597 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2598 return -EINVAL;
2599
af284937
DL		 2600 dev = __dev_get_by_index(net, ifindex);
2601 if (!dev)
1da177e4 2602 return -ENODEV;
1ab1457c 2603
64e724f6
BH		 2604 idev = addrconf_add_dev(dev);
2605 if (IS_ERR(idev))
2606 return PTR_ERR(idev);
1da177e4 2607
93a714d6
MC		 2608 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2609 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2610 true, pfx, ifindex);
2611
2612 if (ret < 0)
2613 return ret;
2614 }
2615
1da177e4
LT		 2616 scope = ipv6_addr_scope(pfx);
2617
4bed72e4
YH		 2618 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2619 if (addrconf_finite_timeout(timeout)) {
2620 expires = jiffies_to_clock_t(timeout * HZ);
2621 valid_lft = timeout;
6f704992 2622 flags = RTF_EXPIRES;
4bed72e4
YH		 2623 } else {
2624 expires = 0;
2625 flags = 0;
2626 ifa_flags |= IFA_F_PERMANENT;
6f704992 2627 }
0778769d 2628
4bed72e4
YH		 2629 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2630 if (addrconf_finite_timeout(timeout)) {
2631 if (timeout == 0)
2632 ifa_flags |= IFA_F_DEPRECATED;
2633 prefered_lft = timeout;
2634 }
0778769d 2635
8a226b2c
JB		 2636 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2637 valid_lft, prefered_lft);
0778769d 2638
1da177e4 2639 if (!IS_ERR(ifp)) {
761aac73
TH		 2640 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2641 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2642 expires, flags);
2643 }
2644
95c385b4
NH		 2645 /*
2646 * Note that section 3.1 of RFC 4429 indicates
2647 * that the Optimistic flag should not be set for
2648 * manually configured addresses
2649 */
cf22f9a2 2650 addrconf_dad_start(ifp);
53bd6749
JP		 2651 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2652 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2653 true, jiffies);
1da177e4 2654 in6_ifa_put(ifp);
c15b1cca 2655 addrconf_verify_rtnl();
1da177e4 2656 return 0;
93a714d6
MC		 2657 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2658 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2659 false, pfx, ifindex);
1da177e4
LT		 2660 }
2661
2662 return PTR_ERR(ifp);
2663}
2664
6046d5b4
HK		 2665static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2666 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2667{
2668 struct inet6_ifaddr *ifp;
2669 struct inet6_dev *idev;
2670 struct net_device *dev;
1ab1457c 2671
24ef0da7
TG		 2672 if (plen > 128)
2673 return -EINVAL;
2674
af284937
DL		 2675 dev = __dev_get_by_index(net, ifindex);
2676 if (!dev)
1da177e4
LT		 2677 return -ENODEV;
2678
e5d08d71 2679 idev = __in6_dev_get(dev);
63159f29 2680 if (!idev)
1da177e4
LT		 2681 return -ENXIO;
2682
2683 read_lock_bh(&idev->lock);
502a2ffd 2684 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2685 if (ifp->prefix_len == plen &&
2686 ipv6_addr_equal(pfx, &ifp->addr)) {
2687 in6_ifa_hold(ifp);
2688 read_unlock_bh(&idev->lock);
1ab1457c 2689
6046d5b4
HK		 2690 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2691 (ifa_flags & IFA_F_MANAGETEMPADDR))
2692 manage_tempaddrs(idev, ifp, 0, 0, false,
2693 jiffies);
1da177e4 2694 ipv6_del_addr(ifp);
6046d5b4 2695 addrconf_verify_rtnl();
93a714d6
MC		 2696 if (ipv6_addr_is_multicast(pfx)) {
2697 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2698 false, pfx, dev->ifindex);
2699 }
1da177e4
LT		 2700 return 0;
2701 }
2702 }
2703 read_unlock_bh(&idev->lock);
2704 return -EADDRNOTAVAIL;
2705}
2706
2707
af284937 2708int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2709{
2710 struct in6_ifreq ireq;
2711 int err;
1ab1457c 2712
af31f412 2713 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2714 return -EPERM;
1ab1457c 2715
1da177e4
LT		 2716 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2717 return -EFAULT;
2718
2719 rtnl_lock();
caeaba79 2720 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2721 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2722 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2723 rtnl_unlock();
2724 return err;
2725}
2726
af284937 2727int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2728{
2729 struct in6_ifreq ireq;
2730 int err;
1ab1457c 2731
af31f412 2732 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2733 return -EPERM;
2734
2735 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2736 return -EFAULT;
2737
2738 rtnl_lock();
6046d5b4 2739 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2740 ireq.ifr6_prefixlen);
1da177e4
LT		 2741 rtnl_unlock();
2742 return err;
2743}
2744
b5f348e5
IJ		 2745static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2746 int plen, int scope)
2747{
2748 struct inet6_ifaddr *ifp;
2749
8a226b2c 2750 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2751 scope, IFA_F_PERMANENT,
2752 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2753 if (!IS_ERR(ifp)) {
2754 spin_lock_bh(&ifp->lock);
2755 ifp->flags &= ~IFA_F_TENTATIVE;
2756 spin_unlock_bh(&ifp->lock);
2757 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2758 in6_ifa_put(ifp);
2759 }
2760}
2761
07a93626 2762#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2763static void sit_add_v4_addrs(struct inet6_dev *idev)
2764{
1da177e4
LT		 2765 struct in6_addr addr;
2766 struct net_device *dev;
c346dca1 2767 struct net *net = dev_net(idev->dev);
929c9cf3 2768 int scope, plen;
f0e2acfa 2769 u32 pflags = 0;
1da177e4
LT		 2770
2771 ASSERT_RTNL();
2772
2773 memset(&addr, 0, sizeof(struct in6_addr));
2774 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2775
2776 if (idev->dev->flags&IFF_POINTOPOINT) {
2777 addr.s6_addr32[0] = htonl(0xfe800000);
2778 scope = IFA_LINK;
929c9cf3 2779 plen = 64;
1da177e4
LT		 2780 } else {
2781 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2782 plen = 96;
f0e2acfa 2783 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2784 }
2785
2786 if (addr.s6_addr32[3]) {
929c9cf3 2787 add_addr(idev, &addr, plen, scope);
f0e2acfa 2788 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2789 return;
2790 }
2791
6fda7350 2792 for_each_netdev(net, dev) {
8e5e8f30 2793 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2794 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2795 struct in_ifaddr *ifa;
1da177e4
LT		 2796
2797 int flag = scope;
2798
2799 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2800
2801 addr.s6_addr32[3] = ifa->ifa_local;
2802
2803 if (ifa->ifa_scope == RT_SCOPE_LINK)
2804 continue;
2805 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2806 if (idev->dev->flags&IFF_POINTOPOINT)
2807 continue;
2808 flag |= IFA_HOST;
2809 }
1da177e4 2810
b5f348e5 2811 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2812 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2813 pflags);
1da177e4
LT		 2814 }
2815 }
1ab1457c 2816 }
1da177e4 2817}
0be669bb 2818#endif
1da177e4
LT		 2819
2820static void init_loopback(struct net_device *dev)
2821{
2822 struct inet6_dev *idev;
25fb6ca4
BK		 2823 struct net_device *sp_dev;
2824 struct inet6_ifaddr *sp_ifa;
2825 struct rt6_info *sp_rt;
1da177e4
LT		 2826
2827 /* ::1 */
2828
2829 ASSERT_RTNL();
2830
e5d08d71 2831 idev = ipv6_find_idev(dev);
63159f29 2832 if (!idev) {
91df42be 2833 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2834 return;
2835 }
2836
b5f348e5 2837 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2838
2839 /* Add routes to other interface's IPv6 addresses */
2840 for_each_netdev(dev_net(dev), sp_dev) {
2841 if (!strcmp(sp_dev->name, dev->name))
2842 continue;
2843
2844 idev = __in6_dev_get(sp_dev);
2845 if (!idev)
2846 continue;
2847
2848 read_lock_bh(&idev->lock);
2849 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2850
2851 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2852 continue;
2853
33d99113
G		 2854 if (sp_ifa->rt) {
2855 /* This dst has been added to garbage list when
2856 * lo device down, release this obsolete dst and
2857 * reallocate a new router for ifa.
2858 */
2859 if (sp_ifa->rt->dst.obsolete > 0) {
2860 ip6_rt_put(sp_ifa->rt);
2861 sp_ifa->rt = NULL;
2862 } else {
2863 continue;
2864 }
2865 }
a881ae1f 2866
57ec0afe 2867 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 2868
2869 /* Failure cases are ignored */
534c8779
G		 2870 if (!IS_ERR(sp_rt)) {
2871 sp_ifa->rt = sp_rt;
25fb6ca4 2872 ip6_ins_rt(sp_rt);
534c8779 2873 }
25fb6ca4
BK		 2874 }
2875 read_unlock_bh(&idev->lock);
2876 }
1da177e4
LT		 2877}
2878
64236f3f
HFS		 2879static void addrconf_add_linklocal(struct inet6_dev *idev,
2880 const struct in6_addr *addr, u32 flags)
1da177e4 2881{
8e5e8f30 2882 struct inet6_ifaddr *ifp;
64236f3f 2883 u32 addr_flags = flags | IFA_F_PERMANENT;
95c385b4
NH		 2884
2885#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2886 if (idev->cnf.optimistic_dad &&
702beb87 2887 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2888 addr_flags |= IFA_F_OPTIMISTIC;
2889#endif
1da177e4 2890
07edd741
HFS		 2891 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2892 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 2893 if (!IS_ERR(ifp)) {
46d48046 2894 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2895 addrconf_dad_start(ifp);
1da177e4
LT		 2896 in6_ifa_put(ifp);
2897 }
2898}
2899
622c81d5
HFS		 2900static bool ipv6_reserved_interfaceid(struct in6_addr address)
2901{
2902 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2903 return true;
2904
2905 if (address.s6_addr32[2] == htonl(0x02005eff) &&
2906 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2907 return true;
2908
2909 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2910 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2911 return true;
2912
2913 return false;
2914}
2915
2916static int ipv6_generate_stable_address(struct in6_addr *address,
2917 u8 dad_count,
2918 const struct inet6_dev *idev)
2919{
622c81d5
HFS		 2920 static DEFINE_SPINLOCK(lock);
2921 static __u32 digest[SHA_DIGEST_WORDS];
2922 static __u32 workspace[SHA_WORKSPACE_WORDS];
2923
2924 static union {
2925 char __data[SHA_MESSAGE_BYTES];
2926 struct {
2927 struct in6_addr secret;
ff40217e 2928 __be32 prefix[2];
622c81d5
HFS		 2929 unsigned char hwaddr[MAX_ADDR_LEN];
2930 u8 dad_count;
2931 } __packed;
2932 } data;
2933
2934 struct in6_addr secret;
2935 struct in6_addr temp;
2936 struct net *net = dev_net(idev->dev);
2937
2938 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
2939
2940 if (idev->cnf.stable_secret.initialized)
2941 secret = idev->cnf.stable_secret.secret;
2942 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
2943 secret = net->ipv6.devconf_dflt->stable_secret.secret;
2944 else
2945 return -1;
2946
2947retry:
2948 spin_lock_bh(&lock);
2949
2950 sha_init(digest);
2951 memset(&data, 0, sizeof(data));
2952 memset(workspace, 0, sizeof(workspace));
2953 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 2954 data.prefix[0] = address->s6_addr32[0];
2955 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 2956 data.secret = secret;
2957 data.dad_count = dad_count;
2958
2959 sha_transform(digest, data.__data, workspace);
2960
2961 temp = *address;
ff40217e
HFS		 2962 temp.s6_addr32[2] = (__force __be32)digest[0];
2963 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 2964
2965 spin_unlock_bh(&lock);
2966
2967 if (ipv6_reserved_interfaceid(temp)) {
2968 dad_count++;
1855b7c3 2969 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 2970 return -1;
2971 goto retry;
2972 }
2973
2974 *address = temp;
2975 return 0;
2976}
2977
bc91b0f0
JP		 2978static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
2979{
622c81d5
HFS		 2980 struct in6_addr addr;
2981
2982 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 2983
622c81d5
HFS		 2984 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
2985 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 2986 addrconf_add_linklocal(idev, &addr,
2987 IFA_F_STABLE_PRIVACY);
622c81d5
HFS		 2988 else if (prefix_route)
2989 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
2990 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
bc91b0f0
JP		 2991 /* addrconf_add_linklocal also adds a prefix_route and we
2992 * only need to care about prefix routes if ipv6_generate_eui64
2993 * couldn't generate one.
2994 */
2995 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 2996 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0
JP		 2997 else if (prefix_route)
2998 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
2999 }
3000}
3001
1da177e4
LT		 3002static void addrconf_dev_config(struct net_device *dev)
3003{
8e5e8f30 3004 struct inet6_dev *idev;
1da177e4
LT		 3005
3006 ASSERT_RTNL();
3007
74235a25
HX		 3008 if ((dev->type != ARPHRD_ETHER) &&
3009 (dev->type != ARPHRD_FDDI) &&
74235a25 3010 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3011 (dev->type != ARPHRD_INFINIBAND) &&
cb6bf355 3012 (dev->type != ARPHRD_IEEE802154) &&
e837735e 3013 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8
JR		 3014 (dev->type != ARPHRD_TUNNEL6) &&
3015 (dev->type != ARPHRD_6LOWPAN)) {
74235a25
HX		 3016 /* Alas, we support only Ethernet autoconfiguration. */
3017 return;
3018 }
3019
1da177e4 3020 idev = addrconf_add_dev(dev);
64e724f6 3021 if (IS_ERR(idev))
1da177e4
LT		 3022 return;
3023
bc91b0f0 3024 addrconf_addr_gen(idev, false);
1da177e4
LT		 3025}
3026
07a93626 3027#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3028static void addrconf_sit_config(struct net_device *dev)
3029{
3030 struct inet6_dev *idev;
3031
3032 ASSERT_RTNL();
3033
1ab1457c
YH		 3034 /*
3035 * Configure the tunnel with one of our IPv4
3036 * addresses... we should configure all of
1da177e4
LT		 3037 * our v4 addrs in the tunnel
3038 */
3039
e5d08d71 3040 idev = ipv6_find_idev(dev);
63159f29 3041 if (!idev) {
91df42be 3042 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3043 return;
3044 }
3045
c7dc89c0 3046 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3047 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3048 return;
3049 }
3050
1da177e4
LT		 3051 sit_add_v4_addrs(idev);
3052
62b54dd9 3053 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3054 addrconf_add_mroute(dev);
1da177e4 3055}
0be669bb 3056#endif
1da177e4 3057
07a93626 3058#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3059static void addrconf_gre_config(struct net_device *dev)
3060{
3061 struct inet6_dev *idev;
aee80b54 3062
aee80b54 3063 ASSERT_RTNL();
3064
e5d08d71 3065 idev = ipv6_find_idev(dev);
63159f29 3066 if (!idev) {
91df42be 3067 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3068 return;
3069 }
3070
bc91b0f0 3071 addrconf_addr_gen(idev, true);
aee80b54 3072}
3073#endif
3074
1ab1457c 3075static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3076 void *ptr)
1da177e4 3077{
351638e7 3078 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 3079 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 3080 int run_pending = 0;
b217d616 3081 int err;
1da177e4 3082
e21e8467 3083 switch (event) {
45ba9dd2 3084 case NETDEV_REGISTER:
74235a25 3085 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3086 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3087 if (IS_ERR(idev))
3088 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3089 }
3090 break;
bcdd553f 3091
1da177e4 3092 case NETDEV_UP:
3c21edbd 3093 case NETDEV_CHANGE:
c2edacf8
JV		 3094 if (dev->flags & IFF_SLAVE)
3095 break;
3096
3ce62a84
WC		 3097 if (idev && idev->cnf.disable_ipv6)
3098 break;
3099
3c21edbd 3100 if (event == NETDEV_UP) {
f24e3d65 3101 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 3102 /* device is not ready yet. */
f3213831 3103 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3104 dev->name);
3105 break;
3106 }
99081049 3107
d31c7b8f
EP		 3108 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3109 idev = ipv6_add_dev(dev);
3110
a317a2f1 3111 if (!IS_ERR_OR_NULL(idev)) {
99081049 3112 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3113 run_pending = 1;
3114 }
3c21edbd 3115 } else {
f24e3d65 3116 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 3117 /* device is still not ready. */
3118 break;
3119 }
3120
3121 if (idev) {
bcdd553f 3122 if (idev->if_flags & IF_READY)
3c21edbd
YH		 3123 /* device is already configured. */
3124 break;
3c21edbd
YH		 3125 idev->if_flags |= IF_READY;
3126 }
3127
f3213831
JP		 3128 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3129 dev->name);
3c21edbd 3130
c5e33bdd 3131 run_pending = 1;
3c21edbd
YH		 3132 }
3133
e21e8467 3134 switch (dev->type) {
07a93626 3135#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3136 case ARPHRD_SIT:
3137 addrconf_sit_config(dev);
3138 break;
aee80b54 3139#endif
07a93626 3140#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3141 case ARPHRD_IPGRE:
3142 addrconf_gre_config(dev);
3143 break;
0be669bb 3144#endif
1da177e4
LT		 3145 case ARPHRD_LOOPBACK:
3146 init_loopback(dev);
3147 break;
3148
3149 default:
3150 addrconf_dev_config(dev);
3151 break;
3ff50b79 3152 }
bcdd553f 3153
a317a2f1 3154 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3155 if (run_pending)
3156 addrconf_dad_run(idev);
3157
bcdd553f
SH		 3158 /*
3159 * If the MTU changed during the interface down,
3160 * when the interface up, the changed MTU must be
3161 * reflected in the idev as well as routers.
1da177e4 3162 */
bcdd553f
SH		 3163 if (idev->cnf.mtu6 != dev->mtu &&
3164 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3165 rt6_mtu_change(dev, dev->mtu);
3166 idev->cnf.mtu6 = dev->mtu;
3167 }
3168 idev->tstamp = jiffies;
3169 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3170
3171 /*
3172 * If the changed mtu during down is lower than
3173 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3174 */
3175 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 3176 addrconf_ifdown(dev, 1);
1da177e4
LT		 3177 }
3178 break;
3179
3180 case NETDEV_CHANGEMTU:
d31c7b8f 3181 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3182 rt6_mtu_change(dev, dev->mtu);
3183 idev->cnf.mtu6 = dev->mtu;
3184 break;
3185 }
3186
d31c7b8f
EP		 3187 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3188 idev = ipv6_add_dev(dev);
a317a2f1 3189 if (!IS_ERR(idev))
d31c7b8f
EP		 3190 break;
3191 }
3192
bcdd553f 3193 /*
db9c7c39 3194 * if MTU under IPV6_MIN_MTU.
bcdd553f
SH		 3195 * Stop IPv6 on this interface.
3196 */
1da177e4
LT		 3197
3198 case NETDEV_DOWN:
3199 case NETDEV_UNREGISTER:
3200 /*
3201 * Remove all addresses from this interface.
3202 */
3203 addrconf_ifdown(dev, event != NETDEV_DOWN);
3204 break;
3c21edbd 3205
1da177e4 3206 case NETDEV_CHANGENAME:
1da177e4 3207 if (idev) {
5632c515 3208 snmp6_unregister_dev(idev);
408c4768 3209 addrconf_sysctl_unregister(idev);
a317a2f1 3210 err = addrconf_sysctl_register(idev);
b217d616
HX		 3211 if (err)
3212 return notifier_from_errno(err);
a317a2f1
WC		 3213 err = snmp6_register_dev(idev);
3214 if (err) {
3215 addrconf_sysctl_unregister(idev);
3216 return notifier_from_errno(err);
3217 }
5632c515 3218 }
1da177e4 3219 break;
bcdd553f 3220
93d9b7d7
JP		 3221 case NETDEV_PRE_TYPE_CHANGE:
3222 case NETDEV_POST_TYPE_CHANGE:
3223 addrconf_type_change(dev, event);
75c78500 3224 break;
3ff50b79 3225 }
1da177e4
LT		 3226
3227 return NOTIFY_OK;
3228}
3229
3230/*
3231 * addrconf module should be notified of a device going up
3232 */
3233static struct notifier_block ipv6_dev_notf = {
3234 .notifier_call = addrconf_notify,
1da177e4
LT		 3235};
3236
93d9b7d7 3237static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3238{
3239 struct inet6_dev *idev;
3240 ASSERT_RTNL();
3241
3242 idev = __in6_dev_get(dev);
3243
93d9b7d7 3244 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3245 ipv6_mc_remap(idev);
93d9b7d7 3246 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3247 ipv6_mc_unmap(idev);
3248}
3249
1da177e4
LT		 3250static int addrconf_ifdown(struct net_device *dev, int how)
3251{
c346dca1 3252 struct net *net = dev_net(dev);
502a2ffd 3253 struct inet6_dev *idev;
3254 struct inet6_ifaddr *ifa;
73a8bd74 3255 int state, i;
1da177e4
LT		 3256
3257 ASSERT_RTNL();
3258
73a8bd74
DM		 3259 rt6_ifdown(net, dev);
3260 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3261
3262 idev = __in6_dev_get(dev);
63159f29 3263 if (!idev)
1da177e4
LT		 3264 return -ENODEV;
3265
bcdd553f
SH		 3266 /*
3267 * Step 1: remove reference to ipv6 device from parent device.
3268 * Do not dev_put!
1da177e4 3269 */
439e2385 3270 if (how) {
1da177e4 3271 idev->dead = 1;
8814c4b5
YH		 3272
3273 /* protected by rtnl_lock */
a9b3cd7f 3274 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3275
3276 /* Step 1.5: remove snmp6 entry */
3277 snmp6_unregister_dev(idev);
3278
3279 }
3280
73a8bd74
DM		 3281 /* Step 2: clear hash table */
3282 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3283 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3284
3285 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3286restart:
b67bfe0d 3287 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74
DM		 3288 if (ifa->idev == idev) {
3289 hlist_del_init_rcu(&ifa->addr_lst);
c15b1cca 3290 addrconf_del_dad_work(ifa);
73a8bd74
DM		 3291 goto restart;
3292 }
3293 }
3294 spin_unlock_bh(&addrconf_hash_lock);
3295 }
3296
1da177e4
LT		 3297 write_lock_bh(&idev->lock);
3298
b7b1bfce
HFS		 3299 addrconf_del_rs_timer(idev);
3300
bcdd553f 3301 /* Step 2: clear flags for stateless addrconf */
439e2385 3302 if (!how)
3c21edbd 3303 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3304
439e2385 3305 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 3306 in6_dev_put(idev);
3307
bcdd553f 3308 /* Step 3: clear tempaddr list */
372e6c8f 3309 while (!list_empty(&idev->tempaddr_list)) {
3310 ifa = list_first_entry(&idev->tempaddr_list,
3311 struct inet6_ifaddr, tmp_list);
3312 list_del(&ifa->tmp_list);
1da177e4
LT		 3313 write_unlock_bh(&idev->lock);
3314 spin_lock_bh(&ifa->lock);
3315
3316 if (ifa->ifpub) {
3317 in6_ifa_put(ifa->ifpub);
3318 ifa->ifpub = NULL;
3319 }
3320 spin_unlock_bh(&ifa->lock);
3321 in6_ifa_put(ifa);
3322 write_lock_bh(&idev->lock);
3323 }
8f37ada5 3324
502a2ffd 3325 while (!list_empty(&idev->addr_list)) {
3326 ifa = list_first_entry(&idev->addr_list,
3327 struct inet6_ifaddr, if_list);
c15b1cca 3328 addrconf_del_dad_work(ifa);
84e8b803 3329
73a8bd74 3330 list_del(&ifa->if_list);
84e8b803 3331
73a8bd74 3332 write_unlock_bh(&idev->lock);
84e8b803 3333
8e8e676d 3334 spin_lock_bh(&ifa->lock);
73a8bd74
DM		 3335 state = ifa->state;
3336 ifa->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 3337 spin_unlock_bh(&ifa->lock);
9d82ca98 3338
73a8bd74
DM		 3339 if (state != INET6_IFADDR_STATE_DEAD) {
3340 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3341 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 3342 }
73a8bd74 3343 in6_ifa_put(ifa);
8f37ada5 3344
73a8bd74
DM		 3345 write_lock_bh(&idev->lock);
3346 }
8f37ada5 3347
1da177e4
LT		 3348 write_unlock_bh(&idev->lock);
3349
381f4dca
SD		 3350 /* Step 5: Discard anycast and multicast list */
3351 if (how) {
3352 ipv6_ac_destroy_dev(idev);
1da177e4 3353 ipv6_mc_destroy_dev(idev);
381f4dca 3354 } else {
1da177e4 3355 ipv6_mc_down(idev);
381f4dca 3356 }
1da177e4 3357
1da177e4 3358 idev->tstamp = jiffies;
1ab1457c 3359
bcdd553f 3360 /* Last: Shot the device (if unregistered) */
439e2385 3361 if (how) {
408c4768 3362 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3363 neigh_parms_release(&nd_tbl, idev->nd_parms);
3364 neigh_ifdown(&nd_tbl, dev);
3365 in6_dev_put(idev);
3366 }
3367 return 0;
3368}
3369
3370static void addrconf_rs_timer(unsigned long data)
3371{
b7b1bfce 3372 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3373 struct net_device *dev = idev->dev;
b7b1bfce 3374 struct in6_addr lladdr;
1da177e4 3375
b7b1bfce 3376 write_lock(&idev->lock);
5b2a1953 3377 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3378 goto out;
3379
9ba2add3 3380 if (!ipv6_accept_ra(idev))
5b2a1953 3381 goto out;
3382
3383 /* Announcement received after solicitation was sent */
3384 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3385 goto out;
1da177e4 3386
b7b1bfce 3387 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
caf92bc4
CW		 3388 write_unlock(&idev->lock);
3389 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3390 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3391 &in6addr_linklocal_allrouters);
3392 else
caf92bc4 3393 goto put;
1da177e4 3394
caf92bc4 3395 write_lock(&idev->lock);
b7b1bfce
HFS		 3396 /* The wait after the last probe can be shorter */
3397 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3398 idev->cnf.rtr_solicits) ?
3399 idev->cnf.rtr_solicit_delay :
3400 idev->cnf.rtr_solicit_interval);
1da177e4 3401 } else {
1da177e4
LT		 3402 /*
3403 * Note: we do not support deprecated "all on-link"
3404 * assumption any longer.
3405 */
91df42be 3406 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3407 }
3408
3409out:
b7b1bfce 3410 write_unlock(&idev->lock);
caf92bc4 3411put:
b7b1bfce 3412 in6_dev_put(idev);
1da177e4
LT		 3413}
3414
3415/*
3416 * Duplicate Address Detection
3417 */
3c21edbd
YH		 3418static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3419{
3420 unsigned long rand_num;
3421 struct inet6_dev *idev = ifp->idev;
3422
95c385b4
NH		 3423 if (ifp->flags & IFA_F_OPTIMISTIC)
3424 rand_num = 0;
3425 else
63862b5b 3426 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3427
b7b1bfce 3428 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3429 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3430}
3431
c15b1cca 3432static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3433{
3434 struct inet6_dev *idev = ifp->idev;
3435 struct net_device *dev = idev->dev;
1da177e4
LT		 3436
3437 addrconf_join_solict(dev, &ifp->addr);
3438
63862b5b 3439 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3440
3441 read_lock_bh(&idev->lock);
622ccdf1 3442 spin_lock(&ifp->lock);
e9d3e084 3443 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3444 goto out;
1da177e4
LT		 3445
3446 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3447 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3448 !(ifp->flags&IFA_F_TENTATIVE) ||
3449 ifp->flags & IFA_F_NODAD) {
cc411d0b 3450 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3451 spin_unlock(&ifp->lock);
1da177e4
LT		 3452 read_unlock_bh(&idev->lock);
3453
3454 addrconf_dad_completed(ifp);
3455 return;
3456 }
3457
6732bade 3458 if (!(idev->if_flags & IF_READY)) {
21809faf 3459 spin_unlock(&ifp->lock);
6732bade 3460 read_unlock_bh(&idev->lock);
3c21edbd 3461 /*
590a9887 3462 * If the device is not ready:
3c21edbd
YH		 3463 * - keep it tentative if it is a permanent address.
3464 * - otherwise, kill it.
3465 */
3466 in6_ifa_hold(ifp);
cc411d0b 3467 addrconf_dad_stop(ifp, 0);
6732bade 3468 return;
3c21edbd 3469 }
95c385b4
NH		 3470
3471 /*
3472 * Optimistic nodes can start receiving
3473 * Frames right away
3474 */
7fd2561e 3475 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3476 ip6_ins_rt(ifp->rt);
7fd2561e
EK		 3477 if (ipv6_use_optimistic_addr(idev)) {
3478 /* Because optimistic nodes can use this address,
3479 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3480 */
3481 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3482 }
3483 }
95c385b4 3484
6732bade 3485 addrconf_dad_kick(ifp);
1da177e4 3486out:
622ccdf1 3487 spin_unlock(&ifp->lock);
1da177e4
LT		 3488 read_unlock_bh(&idev->lock);
3489}
3490
c15b1cca 3491static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3492{
c15b1cca
HFS		 3493 bool begin_dad = false;
3494
8e8e676d 3495 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3496 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3497 ifp->state = INET6_IFADDR_STATE_PREDAD;
3498 begin_dad = true;
3499 }
8e8e676d 3500 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3501
3502 if (begin_dad)
3503 addrconf_mod_dad_work(ifp, 0);
3504}
3505
3506static void addrconf_dad_work(struct work_struct *w)
3507{
3508 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3509 struct inet6_ifaddr,
3510 dad_work);
1da177e4 3511 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3512 struct in6_addr mcaddr;
3513
c15b1cca
HFS		 3514 enum {
3515 DAD_PROCESS,
3516 DAD_BEGIN,
3517 DAD_ABORT,
3518 } action = DAD_PROCESS;
3519
3520 rtnl_lock();
3521
8e8e676d 3522 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3523 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3524 action = DAD_BEGIN;
3525 ifp->state = INET6_IFADDR_STATE_DAD;
3526 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3527 action = DAD_ABORT;
3528 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3529 }
8e8e676d 3530 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3531
3532 if (action == DAD_BEGIN) {
3533 addrconf_dad_begin(ifp);
3534 goto out;
3535 } else if (action == DAD_ABORT) {
3536 addrconf_dad_stop(ifp, 1);
3537 goto out;
3538 }
3539
b7b1bfce 3540 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3541 goto out;
3542
c15b1cca 3543 write_lock_bh(&idev->lock);
122e4519 3544 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3545 write_unlock_bh(&idev->lock);
1da177e4
LT		 3546 goto out;
3547 }
21809faf 3548
3549 spin_lock(&ifp->lock);
622ccdf1
HX		 3550 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3551 spin_unlock(&ifp->lock);
c15b1cca 3552 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3553 goto out;
3554 }
3555
b7b1bfce 3556 if (ifp->dad_probes == 0) {
1da177e4
LT		 3557 /*
3558 * DAD was successful
3559 */
3560
cc411d0b 3561 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3562 spin_unlock(&ifp->lock);
c15b1cca 3563 write_unlock_bh(&idev->lock);
1da177e4
LT		 3564
3565 addrconf_dad_completed(ifp);
3566
3567 goto out;
3568 }
3569
b7b1bfce 3570 ifp->dad_probes--;
c15b1cca
HFS		 3571 addrconf_mod_dad_work(ifp,
3572 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3573 spin_unlock(&ifp->lock);
c15b1cca 3574 write_unlock_bh(&idev->lock);
1da177e4
LT		 3575
3576 /* send a neighbour solicitation for our addr */
1da177e4 3577 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3578 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3579out:
3580 in6_ifa_put(ifp);
c15b1cca 3581 rtnl_unlock();
1da177e4
LT		 3582}
3583
11ffff75
HFS		 3584/* ifp->idev must be at least read locked */
3585static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3586{
3587 struct inet6_ifaddr *ifpiter;
3588 struct inet6_dev *idev = ifp->idev;
3589
602582ca
HFS		 3590 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3591 if (ifpiter->scope > IFA_LINK)
3592 break;
11ffff75
HFS		 3593 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3594 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3595 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3596 IFA_F_PERMANENT)
3597 return false;
3598 }
3599 return true;
3600}
3601
1da177e4
LT		 3602static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3603{
e21e8467 3604 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3605 struct in6_addr lladdr;
b173ee48 3606 bool send_rs, send_mld;
b7b1bfce 3607
c15b1cca 3608 addrconf_del_dad_work(ifp);
1da177e4
LT		 3609
3610 /*
3611 * Configure the address for reception. Now it is valid.
3612 */
3613
3614 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3615
026359bc
TA		 3616 /* If added prefix is link local and we are prepared to process
3617 router advertisements, start sending router solicitations.
1da177e4
LT		 3618 */
3619
1ec047eb 3620 read_lock_bh(&ifp->idev->lock);
11ffff75 3621 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 3622 send_rs = send_mld &&
3623 ipv6_accept_ra(ifp->idev) &&
1ec047eb 3624 ifp->idev->cnf.rtr_solicits > 0 &&
b173ee48 3625 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 3626 read_unlock_bh(&ifp->idev->lock);
3627
b173ee48
HFS		 3628 /* While dad is in progress mld report's source address is in6_addrany.
3629 * Resend with proper ll now.
3630 */
3631 if (send_mld)
3632 ipv6_mc_dad_complete(ifp->idev);
3633
1ec047eb 3634 if (send_rs) {
1da177e4
LT		 3635 /*
3636 * If a host as already performed a random delay
3637 * [...] as part of DAD [...] there is no need
3638 * to delay again before sending the first RS
3639 */
1ec047eb 3640 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 3641 return;
1ec047eb 3642 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 3643
b7b1bfce
HFS		 3644 write_lock_bh(&ifp->idev->lock);
3645 spin_lock(&ifp->lock);
3646 ifp->idev->rs_probes = 1;
1da177e4 3647 ifp->idev->if_flags |= IF_RS_SENT;
b7b1bfce
HFS		 3648 addrconf_mod_rs_timer(ifp->idev,
3649 ifp->idev->cnf.rtr_solicit_interval);
3650 spin_unlock(&ifp->lock);
3651 write_unlock_bh(&ifp->idev->lock);
1da177e4
LT		 3652 }
3653}
3654
e21e8467
SH		 3655static void addrconf_dad_run(struct inet6_dev *idev)
3656{
c5e33bdd
YH		 3657 struct inet6_ifaddr *ifp;
3658
3659 read_lock_bh(&idev->lock);
502a2ffd 3660 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3661 spin_lock(&ifp->lock);
f2344a13
HX		 3662 if (ifp->flags & IFA_F_TENTATIVE &&
3663 ifp->state == INET6_IFADDR_STATE_DAD)
3664 addrconf_dad_kick(ifp);
21809faf 3665 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3666 }
3667 read_unlock_bh(&idev->lock);
3668}
3669
1da177e4
LT		 3670#ifdef CONFIG_PROC_FS
3671struct if6_iter_state {
3c40090a 3672 struct seq_net_private p;
1da177e4 3673 int bucket;
1d578303 3674 int offset;
1da177e4
LT		 3675};
3676
1d578303 3677static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3678{
3679 struct inet6_ifaddr *ifa = NULL;
3680 struct if6_iter_state *state = seq->private;
1218854a 3681 struct net *net = seq_file_net(seq);
1d578303 3682 int p = 0;
1da177e4 3683
1d578303
MM		 3684 /* initial bucket if pos is 0 */
3685 if (pos == 0) {
3686 state->bucket = 0;
3687 state->offset = 0;
3688 }
3689
3690 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3691 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3692 addr_lst) {
9f0d3c27
ED		 3693 if (!net_eq(dev_net(ifa->idev->dev), net))
3694 continue;
1d578303
MM		 3695 /* sync with offset */
3696 if (p < state->offset) {
3697 p++;
3698 continue;
3699 }
3700 state->offset++;
9f0d3c27 3701 return ifa;
1d578303
MM		 3702 }
3703
3704 /* prepare for next bucket */
3705 state->offset = 0;
3706 p = 0;
1da177e4 3707 }
c2e21293 3708 return NULL;
1da177e4
LT		 3709}
3710
c2e21293 3711static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3712 struct inet6_ifaddr *ifa)
1da177e4
LT		 3713{
3714 struct if6_iter_state *state = seq->private;
1218854a 3715 struct net *net = seq_file_net(seq);
1da177e4 3716
b67bfe0d 3717 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3718 if (!net_eq(dev_net(ifa->idev->dev), net))
3719 continue;
1d578303 3720 state->offset++;
9f0d3c27 3721 return ifa;
1d578303 3722 }
3c40090a 3723
c2e21293 3724 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3725 state->offset = 0;
b67bfe0d 3726 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3727 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3728 if (!net_eq(dev_net(ifa->idev->dev), net))
3729 continue;
1d578303 3730 state->offset++;
9f0d3c27 3731 return ifa;
c2e21293 3732 }
1da177e4 3733 }
3c40090a 3734
c2e21293 3735 return NULL;
1da177e4
LT		 3736}
3737
1da177e4 3738static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3739 __acquires(rcu_bh)
1da177e4 3740{
5c578aed 3741 rcu_read_lock_bh();
1d578303 3742 return if6_get_first(seq, *pos);
1da177e4
LT		 3743}
3744
3745static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3746{
3747 struct inet6_ifaddr *ifa;
3748
3749 ifa = if6_get_next(seq, v);
3750 ++*pos;
3751 return ifa;
3752}
3753
3754static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3755 __releases(rcu_bh)
1da177e4 3756{
5c578aed 3757 rcu_read_unlock_bh();
1da177e4
LT		 3758}
3759
3760static int if6_seq_show(struct seq_file *seq, void *v)
3761{
3762 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 3763 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3764 &ifp->addr,
1da177e4
LT		 3765 ifp->idev->dev->ifindex,
3766 ifp->prefix_len,
3767 ifp->scope,
971a351c 3768 (u8) ifp->flags,
1da177e4
LT		 3769 ifp->idev->dev->name);
3770 return 0;
3771}
3772
56b3d975 3773static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3774 .start = if6_seq_start,
3775 .next = if6_seq_next,
3776 .show = if6_seq_show,
3777 .stop = if6_seq_stop,
3778};
3779
3780static int if6_seq_open(struct inode *inode, struct file *file)
3781{
3c40090a
DL		 3782 return seq_open_net(inode, file, &if6_seq_ops,
3783 sizeof(struct if6_iter_state));
1da177e4
LT		 3784}
3785
9a32144e 3786static const struct file_operations if6_fops = {
1da177e4
LT		 3787 .owner = THIS_MODULE,
3788 .open = if6_seq_open,
3789 .read = seq_read,
3790 .llseek = seq_lseek,
3c40090a 3791 .release = seq_release_net,
1da177e4
LT		 3792};
3793
2c8c1e72 3794static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3795{
d4beaa66 3796 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 3797 return -ENOMEM;
3798 return 0;
3799}
3800
2c8c1e72 3801static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 3802{
ece31ffd 3803 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 3804}
3805
3806static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 3807 .init = if6_proc_net_init,
3808 .exit = if6_proc_net_exit,
3c40090a
DL		 3809};
3810
3811int __init if6_proc_init(void)
3812{
3813 return register_pernet_subsys(&if6_proc_net_ops);
3814}
3815
1da177e4
LT		 3816void if6_proc_exit(void)
3817{
3c40090a 3818 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3819}
3820#endif /* CONFIG_PROC_FS */
3821
07a93626 3822#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3823/* Check if address is a home address configured on any interface. */
b71d1d42 3824int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3825{
3826 int ret = 0;
c2e21293 3827 struct inet6_ifaddr *ifp = NULL;
ddbe5032 3828 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3829
5c578aed 3830 rcu_read_lock_bh();
b67bfe0d 3831 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 3832 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3833 continue;
caad295f 3834 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3835 (ifp->flags & IFA_F_HOMEADDRESS)) {
3836 ret = 1;
3837 break;
3838 }
3839 }
5c578aed 3840 rcu_read_unlock_bh();
3b9f9a1c
NT		 3841 return ret;
3842}
3843#endif
3844
1da177e4
LT		 3845/*
3846 * Periodic address status verification
3847 */
3848
c15b1cca 3849static void addrconf_verify_rtnl(void)
1da177e4 3850{
b2db7564 3851 unsigned long now, next, next_sec, next_sched;
1da177e4 3852 struct inet6_ifaddr *ifp;
1da177e4
LT		 3853 int i;
3854
c15b1cca
HFS		 3855 ASSERT_RTNL();
3856
5c578aed 3857 rcu_read_lock_bh();
1da177e4 3858 now = jiffies;
b2db7564 3859 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 3860
c15b1cca 3861 cancel_delayed_work(&addr_chk_work);
1da177e4 3862
bcdd553f 3863 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3864restart:
c15b1cca 3865 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 3866 unsigned long age;
1da177e4 3867
fad8da3e
YA		 3868 /* When setting preferred_lft to a value not zero or
3869 * infinity, while valid_lft is infinity
3870 * IFA_F_PERMANENT has a non-infinity life time.
3871 */
3872 if ((ifp->flags & IFA_F_PERMANENT) &&
3873 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 3874 continue;
3875
3876 spin_lock(&ifp->lock);
b2db7564
YH		 3877 /* We try to batch several events at once. */
3878 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3879
8f27ebb9
YH		 3880 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3881 age >= ifp->valid_lft) {
1da177e4
LT		 3882 spin_unlock(&ifp->lock);
3883 in6_ifa_hold(ifp);
1da177e4
LT		 3884 ipv6_del_addr(ifp);
3885 goto restart;
8f27ebb9
YH		 3886 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3887 spin_unlock(&ifp->lock);
3888 continue;
1da177e4 3889 } else if (age >= ifp->prefered_lft) {
a1ed0526 3890 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3891 int deprecate = 0;
3892
3893 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3894 deprecate = 1;
3895 ifp->flags |= IFA_F_DEPRECATED;
3896 }
3897
fad8da3e
YA		 3898 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3899 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 3900 next = ifp->tstamp + ifp->valid_lft * HZ;
3901
3902 spin_unlock(&ifp->lock);
3903
3904 if (deprecate) {
3905 in6_ifa_hold(ifp);
1da177e4
LT		 3906
3907 ipv6_ifa_notify(0, ifp);
3908 in6_ifa_put(ifp);
3909 goto restart;
3910 }
1da177e4
LT		 3911 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3912 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3913 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3914 ifp->idev->cnf.dad_transmits *
1f9248e5 3915 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 3916
1da177e4
LT		 3917 if (age >= ifp->prefered_lft - regen_advance) {
3918 struct inet6_ifaddr *ifpub = ifp->ifpub;
3919 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3920 next = ifp->tstamp + ifp->prefered_lft * HZ;
3921 if (!ifp->regen_count && ifpub) {
3922 ifp->regen_count++;
3923 in6_ifa_hold(ifp);
3924 in6_ifa_hold(ifpub);
3925 spin_unlock(&ifp->lock);
5c578aed 3926
291d809b
HY		 3927 spin_lock(&ifpub->lock);
3928 ifpub->regen_count = 0;
3929 spin_unlock(&ifpub->lock);
1da177e4
LT		 3930 ipv6_create_tempaddr(ifpub, ifp);
3931 in6_ifa_put(ifpub);
3932 in6_ifa_put(ifp);
3933 goto restart;
3934 }
3935 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3936 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3937 spin_unlock(&ifp->lock);
1da177e4
LT		 3938 } else {
3939 /* ifp->prefered_lft <= ifp->valid_lft */
3940 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3941 next = ifp->tstamp + ifp->prefered_lft * HZ;
3942 spin_unlock(&ifp->lock);
3943 }
3944 }
1da177e4
LT		 3945 }
3946
b2db7564
YH		 3947 next_sec = round_jiffies_up(next);
3948 next_sched = next;
3949
3950 /* If rounded timeout is accurate enough, accept it. */
3951 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3952 next_sched = next_sec;
3953
3954 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3955 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3956 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3957
ba3542e1 3958 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3959 now, next, next_sec, next_sched);
c15b1cca 3960 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 3961 rcu_read_unlock_bh();
1da177e4
LT		 3962}
3963
c15b1cca
HFS		 3964static void addrconf_verify_work(struct work_struct *w)
3965{
3966 rtnl_lock();
3967 addrconf_verify_rtnl();
3968 rtnl_unlock();
3969}
3970
3971static void addrconf_verify(void)
3972{
3973 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
3974}
3975
caeaba79
ND		 3976static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3977 struct in6_addr **peer_pfx)
461d8837
TG		 3978{
3979 struct in6_addr *pfx = NULL;
3980
caeaba79
ND		 3981 *peer_pfx = NULL;
3982
461d8837
TG		 3983 if (addr)
3984 pfx = nla_data(addr);
3985
3986 if (local) {
3987 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 3988 *peer_pfx = pfx;
3989 pfx = nla_data(local);
461d8837
TG		 3990 }
3991
3992 return pfx;
3993}
3994
ef7c79ed 3995static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3996 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3997 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3998 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 3999 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 4000};
4001
1da177e4 4002static int
661d2967 4003inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4004{
3b1e0a65 4005 struct net *net = sock_net(skb->sk);
b933f716
TG		 4006 struct ifaddrmsg *ifm;
4007 struct nlattr *tb[IFA_MAX+1];
caeaba79 4008 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4009 u32 ifa_flags;
b933f716 4010 int err;
1da177e4 4011
b933f716
TG		 4012 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4013 if (err < 0)
4014 return err;
4015
4016 ifm = nlmsg_data(nlh);
caeaba79 4017 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4018 if (!pfx)
1da177e4
LT		 4019 return -EINVAL;
4020
6046d5b4
HK		 4021 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4022
4023 /* We ignore other flags so far. */
4024 ifa_flags &= IFA_F_MANAGETEMPADDR;
4025
4026 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4027 ifm->ifa_prefixlen);
1da177e4
LT		 4028}
4029
479840ff 4030static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 4031 u32 prefered_lft, u32 valid_lft)
081bba5b 4032{
6f704992
YH		 4033 u32 flags;
4034 clock_t expires;
4bed72e4 4035 unsigned long timeout;
53bd6749 4036 bool was_managetempaddr;
5b84efec 4037 bool had_prefixroute;
46d48046 4038
c15b1cca
HFS		 4039 ASSERT_RTNL();
4040
081bba5b
NT		 4041 if (!valid_lft || (prefered_lft > valid_lft))
4042 return -EINVAL;
4043
53bd6749
JP		 4044 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4045 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4046 return -EINVAL;
4047
4bed72e4
YH		 4048 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4049 if (addrconf_finite_timeout(timeout)) {
4050 expires = jiffies_to_clock_t(timeout * HZ);
4051 valid_lft = timeout;
6f704992 4052 flags = RTF_EXPIRES;
4bed72e4
YH		 4053 } else {
4054 expires = 0;
4055 flags = 0;
4056 ifa_flags |= IFA_F_PERMANENT;
6f704992 4057 }
081bba5b 4058
4bed72e4
YH		 4059 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4060 if (addrconf_finite_timeout(timeout)) {
4061 if (timeout == 0)
4062 ifa_flags |= IFA_F_DEPRECATED;
4063 prefered_lft = timeout;
4064 }
081bba5b
NT		 4065
4066 spin_lock_bh(&ifp->lock);
53bd6749 4067 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4068 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4069 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4070 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4071 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4072 IFA_F_NOPREFIXROUTE);
53bd6749 4073 ifp->flags |= ifa_flags;
081bba5b
NT		 4074 ifp->tstamp = jiffies;
4075 ifp->valid_lft = valid_lft;
4076 ifp->prefered_lft = prefered_lft;
4077
4078 spin_unlock_bh(&ifp->lock);
4079 if (!(ifp->flags&IFA_F_TENTATIVE))
4080 ipv6_ifa_notify(0, ifp);
081bba5b 4081
761aac73
TH		 4082 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4083 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4084 expires, flags);
5b84efec
TH		 4085 } else if (had_prefixroute) {
4086 enum cleanup_prefix_rt_t action;
4087 unsigned long rt_expires;
4088
4089 write_lock_bh(&ifp->idev->lock);
4090 action = check_cleanup_prefix_route(ifp, &rt_expires);
4091 write_unlock_bh(&ifp->idev->lock);
4092
4093 if (action != CLEANUP_PREFIX_RT_NOP) {
4094 cleanup_prefix_route(ifp, rt_expires,
4095 action == CLEANUP_PREFIX_RT_DEL);
4096 }
761aac73 4097 }
53bd6749
JP		 4098
4099 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4100 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4101 valid_lft = prefered_lft = 0;
4102 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4103 !was_managetempaddr, jiffies);
4104 }
4105
c15b1cca 4106 addrconf_verify_rtnl();
081bba5b
NT		 4107
4108 return 0;
4109}
4110
1da177e4 4111static int
661d2967 4112inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4113{
3b1e0a65 4114 struct net *net = sock_net(skb->sk);
461d8837
TG		 4115 struct ifaddrmsg *ifm;
4116 struct nlattr *tb[IFA_MAX+1];
caeaba79 4117 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 4118 struct inet6_ifaddr *ifa;
4119 struct net_device *dev;
55ebaef1 4120 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 4121 u32 ifa_flags;
461d8837 4122 int err;
1da177e4 4123
461d8837
TG		 4124 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4125 if (err < 0)
4126 return err;
4127
4128 ifm = nlmsg_data(nlh);
caeaba79 4129 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4130 if (!pfx)
1da177e4
LT		 4131 return -EINVAL;
4132
461d8837 4133 if (tb[IFA_CACHEINFO]) {
0778769d 4134 struct ifa_cacheinfo *ci;
461d8837
TG		 4135
4136 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 4137 valid_lft = ci->ifa_valid;
461d8837
TG		 4138 preferred_lft = ci->ifa_prefered;
4139 } else {
4140 preferred_lft = INFINITY_LIFE_TIME;
4141 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 4142 }
4143
af284937 4144 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4145 if (!dev)
7198f8ce
TG		 4146 return -ENODEV;
4147
479840ff
JP		 4148 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4149
55ebaef1 4150 /* We ignore other flags so far. */
761aac73 4151 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
93a714d6 4152 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
55ebaef1 4153
1cab3da6 4154 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
63159f29 4155 if (!ifa) {
7198f8ce
TG		 4156 /*
4157 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4158 * userspace already relies on not having to provide this.
7198f8ce 4159 */
caeaba79 4160 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 4161 ifm->ifa_prefixlen, ifa_flags,
4162 preferred_lft, valid_lft);
081bba5b
NT		 4163 }
4164
7198f8ce
TG		 4165 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4166 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4167 err = -EEXIST;
4168 else
55ebaef1 4169 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 4170
4171 in6_ifa_put(ifa);
4172
4173 return err;
1da177e4
LT		 4174}
4175
479840ff 4176static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4177 u8 scope, int ifindex)
4178{
4179 struct ifaddrmsg *ifm;
4180
4181 ifm = nlmsg_data(nlh);
4182 ifm->ifa_family = AF_INET6;
4183 ifm->ifa_prefixlen = prefixlen;
4184 ifm->ifa_flags = flags;
4185 ifm->ifa_scope = scope;
4186 ifm->ifa_index = ifindex;
4187}
4188
85486af0
TG		 4189static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4190 unsigned long tstamp, u32 preferred, u32 valid)
4191{
4192 struct ifa_cacheinfo ci;
4193
18a31e1e
TG		 4194 ci.cstamp = cstamp_delta(cstamp);
4195 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4196 ci.ifa_prefered = preferred;
4197 ci.ifa_valid = valid;
4198
4199 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4200}
4201
101bb229
TG		 4202static inline int rt_scope(int ifa_scope)
4203{
4204 if (ifa_scope & IFA_HOST)
4205 return RT_SCOPE_HOST;
4206 else if (ifa_scope & IFA_LINK)
4207 return RT_SCOPE_LINK;
4208 else if (ifa_scope & IFA_SITE)
4209 return RT_SCOPE_SITE;
4210 else
4211 return RT_SCOPE_UNIVERSE;
4212}
4213
0ab6803b
TG		 4214static inline int inet6_ifaddr_msgsize(void)
4215{
339bf98f 4216 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4217 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4218 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4219 + nla_total_size(sizeof(struct ifa_cacheinfo))
4220 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4221}
c5396a31 4222
1da177e4 4223static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4224 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4225{
1da177e4 4226 struct nlmsghdr *nlh;
85486af0 4227 u32 preferred, valid;
1da177e4 4228
15e47304 4229 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4230 if (!nlh)
26932566 4231 return -EMSGSIZE;
0ab6803b 4232
101bb229
TG		 4233 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4234 ifa->idev->dev->ifindex);
4235
fad8da3e
YA		 4236 if (!((ifa->flags&IFA_F_PERMANENT) &&
4237 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4238 preferred = ifa->prefered_lft;
4239 valid = ifa->valid_lft;
4240 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4241 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4242 if (preferred > tval)
4243 preferred -= tval;
4244 else
4245 preferred = 0;
f56619fc
BH		 4246 if (valid != INFINITY_LIFE_TIME) {
4247 if (valid > tval)
4248 valid -= tval;
4249 else
4250 valid = 0;
4251 }
1da177e4
LT		 4252 }
4253 } else {
85486af0
TG		 4254 preferred = INFINITY_LIFE_TIME;
4255 valid = INFINITY_LIFE_TIME;
4256 }
4257
7996c799 4258 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4259 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4260 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4261 goto error;
4262 } else
930345ea 4263 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4264 goto error;
4265
4266 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4267 goto error;
1da177e4 4268
479840ff
JP		 4269 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4270 goto error;
4271
053c095a
JB		 4272 nlmsg_end(skb, nlh);
4273 return 0;
caeaba79
ND		 4274
4275error:
4276 nlmsg_cancel(skb, nlh);
4277 return -EMSGSIZE;
1da177e4
LT		 4278}
4279
4280static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4281 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4282{
1da177e4 4283 struct nlmsghdr *nlh;
101bb229
TG		 4284 u8 scope = RT_SCOPE_UNIVERSE;
4285 int ifindex = ifmca->idev->dev->ifindex;
4286
4287 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4288 scope = RT_SCOPE_SITE;
1da177e4 4289
15e47304 4290 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4291 if (!nlh)
26932566 4292 return -EMSGSIZE;
85486af0 4293
0ab6803b 4294 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4295 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4296 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4297 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4298 nlmsg_cancel(skb, nlh);
4299 return -EMSGSIZE;
4300 }
85486af0 4301
053c095a
JB		 4302 nlmsg_end(skb, nlh);
4303 return 0;
1da177e4
LT		 4304}
4305
4306static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4307 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4308{
1da177e4 4309 struct nlmsghdr *nlh;
101bb229
TG		 4310 u8 scope = RT_SCOPE_UNIVERSE;
4311 int ifindex = ifaca->aca_idev->dev->ifindex;
4312
4313 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4314 scope = RT_SCOPE_SITE;
1da177e4 4315
15e47304 4316 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4317 if (!nlh)
26932566 4318 return -EMSGSIZE;
85486af0 4319
0ab6803b 4320 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4321 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4322 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4323 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4324 nlmsg_cancel(skb, nlh);
4325 return -EMSGSIZE;
4326 }
1da177e4 4327
053c095a
JB		 4328 nlmsg_end(skb, nlh);
4329 return 0;
1da177e4
LT		 4330}
4331
e21e8467 4332enum addr_type_t {
1da177e4
LT		 4333 UNICAST_ADDR,
4334 MULTICAST_ADDR,
4335 ANYCAST_ADDR,
4336};
4337
234b27c3
ED		 4338/* called with rcu_read_lock() */
4339static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4340 struct netlink_callback *cb, enum addr_type_t type,
4341 int s_ip_idx, int *p_ip_idx)
4342{
234b27c3
ED		 4343 struct ifmcaddr6 *ifmca;
4344 struct ifacaddr6 *ifaca;
4345 int err = 1;
4346 int ip_idx = *p_ip_idx;
4347
4348 read_lock_bh(&idev->lock);
4349 switch (type) {
502a2ffd 4350 case UNICAST_ADDR: {
4351 struct inet6_ifaddr *ifa;
4352
234b27c3 4353 /* unicast address incl. temp addr */
502a2ffd 4354 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4355 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4356 continue;
4357 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4358 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4359 cb->nlh->nlmsg_seq,
4360 RTM_NEWADDR,
4361 NLM_F_MULTI);
053c095a 4362 if (err < 0)
234b27c3 4363 break;
63998ac2 4364 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4365 }
4366 break;
502a2ffd 4367 }
234b27c3
ED		 4368 case MULTICAST_ADDR:
4369 /* multicast address */
4370 for (ifmca = idev->mc_list; ifmca;
4371 ifmca = ifmca->next, ip_idx++) {
4372 if (ip_idx < s_ip_idx)
4373 continue;
4374 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4375 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4376 cb->nlh->nlmsg_seq,
4377 RTM_GETMULTICAST,
4378 NLM_F_MULTI);
053c095a 4379 if (err < 0)
234b27c3
ED		 4380 break;
4381 }
4382 break;
4383 case ANYCAST_ADDR:
4384 /* anycast address */
4385 for (ifaca = idev->ac_list; ifaca;
4386 ifaca = ifaca->aca_next, ip_idx++) {
4387 if (ip_idx < s_ip_idx)
4388 continue;
4389 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4390 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4391 cb->nlh->nlmsg_seq,
4392 RTM_GETANYCAST,
4393 NLM_F_MULTI);
053c095a 4394 if (err < 0)
234b27c3
ED		 4395 break;
4396 }
4397 break;
4398 default:
4399 break;
4400 }
4401 read_unlock_bh(&idev->lock);
4402 *p_ip_idx = ip_idx;
4403 return err;
4404}
4405
1da177e4
LT		 4406static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4407 enum addr_type_t type)
4408{
234b27c3
ED		 4409 struct net *net = sock_net(skb->sk);
4410 int h, s_h;
1da177e4
LT		 4411 int idx, ip_idx;
4412 int s_idx, s_ip_idx;
1da177e4 4413 struct net_device *dev;
234b27c3
ED		 4414 struct inet6_dev *idev;
4415 struct hlist_head *head;
1ab1457c 4416
234b27c3
ED		 4417 s_h = cb->args[0];
4418 s_idx = idx = cb->args[1];
4419 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4420
234b27c3 4421 rcu_read_lock();
63998ac2 4422 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4423 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4424 idx = 0;
4425 head = &net->dev_index_head[h];
b67bfe0d 4426 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4427 if (idx < s_idx)
4428 goto cont;
4b97efdf 4429 if (h > s_h || idx > s_idx)
234b27c3
ED		 4430 s_ip_idx = 0;
4431 ip_idx = 0;
e21e8467
SH		 4432 idev = __in6_dev_get(dev);
4433 if (!idev)
234b27c3
ED		 4434 goto cont;
4435
4436 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4437 s_ip_idx, &ip_idx) < 0)
234b27c3 4438 goto done;
7562f876 4439cont:
234b27c3
ED		 4440 idx++;
4441 }
1da177e4 4442 }
234b27c3
ED		 4443done:
4444 rcu_read_unlock();
4445 cb->args[0] = h;
4446 cb->args[1] = idx;
4447 cb->args[2] = ip_idx;
4448
1da177e4
LT		 4449 return skb->len;
4450}
4451
4452static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4453{
4454 enum addr_type_t type = UNICAST_ADDR;
b854272b 4455
1da177e4
LT		 4456 return inet6_dump_addr(skb, cb, type);
4457}
4458
4459static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4460{
4461 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4462
1da177e4
LT		 4463 return inet6_dump_addr(skb, cb, type);
4464}
4465
4466
4467static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4468{
4469 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4470
1da177e4
LT		 4471 return inet6_dump_addr(skb, cb, type);
4472}
4473
661d2967 4474static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4475{
3b1e0a65 4476 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4477 struct ifaddrmsg *ifm;
4478 struct nlattr *tb[IFA_MAX+1];
caeaba79 4479 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4480 struct net_device *dev = NULL;
4481 struct inet6_ifaddr *ifa;
4482 struct sk_buff *skb;
6c223828
NT		 4483 int err;
4484
1b29fc2c
TG		 4485 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4486 if (err < 0)
4487 goto errout;
4488
caeaba79 4489 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
63159f29 4490 if (!addr) {
1b29fc2c
TG		 4491 err = -EINVAL;
4492 goto errout;
6c223828 4493 }
6c223828 4494
1b29fc2c 4495 ifm = nlmsg_data(nlh);
6c223828 4496 if (ifm->ifa_index)
6fda7350 4497 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4498
e21e8467
SH		 4499 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4500 if (!ifa) {
1b29fc2c
TG		 4501 err = -EADDRNOTAVAIL;
4502 goto errout;
4503 }
6c223828 4504
e21e8467
SH		 4505 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4506 if (!skb) {
6c223828 4507 err = -ENOBUFS;
1b29fc2c 4508 goto errout_ifa;
6c223828
NT		 4509 }
4510
15e47304 4511 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4512 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4513 if (err < 0) {
4514 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4515 WARN_ON(err == -EMSGSIZE);
4516 kfree_skb(skb);
4517 goto errout_ifa;
4518 }
15e47304 4519 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4520errout_ifa:
6c223828 4521 in6_ifa_put(ifa);
1b29fc2c 4522errout:
6c223828 4523 return err;
6c223828
NT		 4524}
4525
1da177e4
LT		 4526static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4527{
4528 struct sk_buff *skb;
c346dca1 4529 struct net *net = dev_net(ifa->idev->dev);
5d620266 4530 int err = -ENOBUFS;
1da177e4 4531
0ab6803b 4532 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 4533 if (!skb)
5d620266
TG		 4534 goto errout;
4535
4536 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4537 if (err < 0) {
4538 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4539 WARN_ON(err == -EMSGSIZE);
4540 kfree_skb(skb);
4541 goto errout;
4542 }
1ce85fe4
PNA		 4543 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4544 return;
5d620266
TG		 4545errout:
4546 if (err < 0)
6fda7350 4547 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4548}
4549
b6f99a21 4550static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4551 __s32 *array, int bytes)
4552{
04561c1f
TG		 4553 BUG_ON(bytes < (DEVCONF_MAX * 4));
4554
1da177e4
LT		 4555 memset(array, 0, bytes);
4556 array[DEVCONF_FORWARDING] = cnf->forwarding;
4557 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4558 array[DEVCONF_MTU6] = cnf->mtu6;
4559 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4560 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4561 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4562 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4563 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4564 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4565 jiffies_to_msecs(cnf->rtr_solicit_interval);
4566 array[DEVCONF_RTR_SOLICIT_DELAY] =
4567 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4568 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4569 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4570 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4571 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4572 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4573 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4574 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4575 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4576 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4577 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4578 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4579 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 4580 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4581#ifdef CONFIG_IPV6_ROUTER_PREF
4582 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4583 array[DEVCONF_RTR_PROBE_INTERVAL] =
4584 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4585#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4586 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4587#endif
930d6ff2 4588#endif
fbea49e1 4589 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4590 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4591#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4592 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 4593 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 4594#endif
7bc570c8
YH		 4595#ifdef CONFIG_IPV6_MROUTE
4596 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4597#endif
778d80be 4598 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4599 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4600 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4601 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 4602 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 4603 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 4604 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
3d1bec99 4605 /* we omit DEVCONF_STABLE_SECRET for now */
1da177e4
LT		 4606}
4607
b382b191
TG		 4608static inline size_t inet6_ifla6_size(void)
4609{
4610 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4611 + nla_total_size(sizeof(struct ifla_cacheinfo))
4612 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4613 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4614 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4615 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4616}
4617
339bf98f
TG		 4618static inline size_t inet6_if_nlmsg_size(void)
4619{
4620 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4621 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4622 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4623 + nla_total_size(4) /* IFLA_MTU */
4624 + nla_total_size(4) /* IFLA_LINK */
b382b191 4625 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4626}
c5396a31 4627
be281e55 4628static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4629 int items, int bytes)
7f7d9a6b
HX		 4630{
4631 int i;
4632 int pad = bytes - sizeof(u64) * items;
4633 BUG_ON(pad < 0);
4634
4635 /* Use put_unaligned() because stats may not be aligned for u64. */
4636 put_unaligned(items, &stats[0]);
4637 for (i = 1; i < items; i++)
be281e55 4638 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4639
4640 memset(&stats[items], 0, pad);
4641}
4642
698365fa 4643static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4ce3c183
ED		 4644 int items, int bytes, size_t syncpoff)
4645{
4646 int i;
4647 int pad = bytes - sizeof(u64) * items;
4648 BUG_ON(pad < 0);
4649
4650 /* Use put_unaligned() because stats may not be aligned for u64. */
4651 put_unaligned(items, &stats[0]);
4652 for (i = 1; i < items; i++)
4653 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4654
4655 memset(&stats[items], 0, pad);
4656}
4657
7f7d9a6b
HX		 4658static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4659 int bytes)
4660{
e21e8467 4661 switch (attrtype) {
7f7d9a6b 4662 case IFLA_INET6_STATS:
698365fa 4663 __snmp6_fill_stats64(stats, idev->stats.ipv6,
4ce3c183 4664 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4665 break;
4666 case IFLA_INET6_ICMP6STATS:
be281e55 4667 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4668 break;
4669 }
4670}
4671
b382b191
TG		 4672static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4673{
4674 struct nlattr *nla;
4675 struct ifla_cacheinfo ci;
4676
c78679e8
DM		 4677 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4678 goto nla_put_failure;
b382b191 4679 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4680 ci.tstamp = cstamp_delta(idev->tstamp);
4681 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 4682 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 4683 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4684 goto nla_put_failure;
b382b191 4685 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 4686 if (!nla)
b382b191
TG		 4687 goto nla_put_failure;
4688 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4689
4690 /* XXX - MC not implemented */
4691
4692 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 4693 if (!nla)
b382b191
TG		 4694 goto nla_put_failure;
4695 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4696
4697 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 4698 if (!nla)
b382b191
TG		 4699 goto nla_put_failure;
4700 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4701
f53adae4 4702 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 4703 if (!nla)
f53adae4 4704 goto nla_put_failure;
bc91b0f0
JP		 4705
4706 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4707 goto nla_put_failure;
4708
f53adae4
DB		 4709 read_lock_bh(&idev->lock);
4710 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4711 read_unlock_bh(&idev->lock);
4712
b382b191
TG		 4713 return 0;
4714
4715nla_put_failure:
4716 return -EMSGSIZE;
4717}
4718
4719static size_t inet6_get_link_af_size(const struct net_device *dev)
4720{
4721 if (!__in6_dev_get(dev))
4722 return 0;
4723
4724 return inet6_ifla6_size();
4725}
4726
4727static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4728{
4729 struct inet6_dev *idev = __in6_dev_get(dev);
4730
4731 if (!idev)
4732 return -ENODATA;
4733
4734 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4735 return -EMSGSIZE;
4736
4737 return 0;
4738}
4739
f53adae4
DB		 4740static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4741{
f53adae4
DB		 4742 struct inet6_ifaddr *ifp;
4743 struct net_device *dev = idev->dev;
fc403832 4744 bool update_rs = false;
dc848292 4745 struct in6_addr ll_addr;
f53adae4 4746
c15b1cca
HFS		 4747 ASSERT_RTNL();
4748
63159f29 4749 if (!token)
f53adae4
DB		 4750 return -EINVAL;
4751 if (ipv6_addr_any(token))
4752 return -EINVAL;
4753 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4754 return -EINVAL;
f53adae4
DB		 4755 if (!ipv6_accept_ra(idev))
4756 return -EINVAL;
4757 if (idev->cnf.rtr_solicits <= 0)
4758 return -EINVAL;
4759
4760 write_lock_bh(&idev->lock);
4761
4762 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4763 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4764
4765 write_unlock_bh(&idev->lock);
4766
dc848292
HFS		 4767 if (!idev->dead && (idev->if_flags & IF_READY) &&
4768 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4769 IFA_F_OPTIMISTIC)) {
fc403832
DB		 4770
4771 /* If we're not ready, then normal ifup will take care
4772 * of this. Otherwise, we need to request our rs here.
4773 */
4774 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4775 update_rs = true;
4776 }
f53adae4
DB		 4777
4778 write_lock_bh(&idev->lock);
fc403832 4779
77ecaace 4780 if (update_rs) {
fc403832 4781 idev->if_flags |= IF_RS_SENT;
77ecaace
HFS		 4782 idev->rs_probes = 1;
4783 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4784 }
f53adae4
DB		 4785
4786 /* Well, that's kinda nasty ... */
4787 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4788 spin_lock(&ifp->lock);
617fe29d 4789 if (ifp->tokenized) {
f53adae4
DB		 4790 ifp->valid_lft = 0;
4791 ifp->prefered_lft = 0;
4792 }
4793 spin_unlock(&ifp->lock);
4794 }
4795
4796 write_unlock_bh(&idev->lock);
b2ed64a9 4797 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 4798 addrconf_verify_rtnl();
f53adae4
DB		 4799 return 0;
4800}
4801
11b1f828
DB		 4802static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4803 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
4804 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
4805};
4806
4807static int inet6_validate_link_af(const struct net_device *dev,
4808 const struct nlattr *nla)
4809{
4810 struct nlattr *tb[IFLA_INET6_MAX + 1];
4811
4812 if (dev && !__in6_dev_get(dev))
4813 return -EAFNOSUPPORT;
4814
4815 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4816}
4817
f53adae4
DB		 4818static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4819{
4820 int err = -EINVAL;
4821 struct inet6_dev *idev = __in6_dev_get(dev);
4822 struct nlattr *tb[IFLA_INET6_MAX + 1];
4823
4824 if (!idev)
4825 return -EAFNOSUPPORT;
4826
4827 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4828 BUG();
4829
bc91b0f0 4830 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 4831 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 4832 if (err)
4833 return err;
4834 }
4835
4836 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4837 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4838
4839 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
622c81d5
HFS		 4840 mode != IN6_ADDR_GEN_MODE_NONE &&
4841 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
4842 return -EINVAL;
4843
4844 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4845 !idev->cnf.stable_secret.initialized &&
4846 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
bc91b0f0 4847 return -EINVAL;
622c81d5 4848
bc91b0f0
JP		 4849 idev->addr_gen_mode = mode;
4850 err = 0;
4851 }
f53adae4
DB		 4852
4853 return err;
4854}
4855
1ab1457c 4856static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4857 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4858{
04561c1f 4859 struct net_device *dev = idev->dev;
04561c1f
TG		 4860 struct ifinfomsg *hdr;
4861 struct nlmsghdr *nlh;
4862 void *protoinfo;
04561c1f 4863
15e47304 4864 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 4865 if (!nlh)
26932566 4866 return -EMSGSIZE;
04561c1f
TG		 4867
4868 hdr = nlmsg_data(nlh);
4869 hdr->ifi_family = AF_INET6;
4870 hdr->__ifi_pad = 0;
4871 hdr->ifi_type = dev->type;
4872 hdr->ifi_index = dev->ifindex;
4873 hdr->ifi_flags = dev_get_flags(dev);
4874 hdr->ifi_change = 0;
4875
c78679e8
DM		 4876 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4877 (dev->addr_len &&
4878 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4879 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a
ND		 4880 (dev->ifindex != dev_get_iflink(dev) &&
4881 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
c78679e8 4882 goto nla_put_failure;
04561c1f 4883 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 4884 if (!protoinfo)
04561c1f 4885 goto nla_put_failure;
1da177e4 4886
b382b191 4887 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4888 goto nla_put_failure;
1da177e4 4889
04561c1f 4890 nla_nest_end(skb, protoinfo);
053c095a
JB		 4891 nlmsg_end(skb, nlh);
4892 return 0;
1da177e4 4893
04561c1f 4894nla_put_failure:
26932566
PM		 4895 nlmsg_cancel(skb, nlh);
4896 return -EMSGSIZE;
1da177e4
LT		 4897}
4898
4899static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4900{
3b1e0a65 4901 struct net *net = sock_net(skb->sk);
84d2697d 4902 int h, s_h;
434a8a58 4903 int idx = 0, s_idx;
1da177e4
LT		 4904 struct net_device *dev;
4905 struct inet6_dev *idev;
84d2697d 4906 struct hlist_head *head;
1da177e4 4907
84d2697d
ED		 4908 s_h = cb->args[0];
4909 s_idx = cb->args[1];
4910
4911 rcu_read_lock();
4912 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4913 idx = 0;
4914 head = &net->dev_index_head[h];
b67bfe0d 4915 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 4916 if (idx < s_idx)
4917 goto cont;
4918 idev = __in6_dev_get(dev);
4919 if (!idev)
4920 goto cont;
4921 if (inet6_fill_ifinfo(skb, idev,
15e47304 4922 NETLINK_CB(cb->skb).portid,
84d2697d 4923 cb->nlh->nlmsg_seq,
053c095a 4924 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 4925 goto out;
7562f876 4926cont:
84d2697d
ED		 4927 idx++;
4928 }
1da177e4 4929 }
84d2697d
ED		 4930out:
4931 rcu_read_unlock();
4932 cb->args[1] = idx;
4933 cb->args[0] = h;
1da177e4
LT		 4934
4935 return skb->len;
4936}
4937
4938void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4939{
4940 struct sk_buff *skb;
c346dca1 4941 struct net *net = dev_net(idev->dev);
8d7a76c9 4942 int err = -ENOBUFS;
1ab1457c 4943
339bf98f 4944 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 4945 if (!skb)
8d7a76c9
TG		 4946 goto errout;
4947
4948 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4949 if (err < 0) {
4950 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4951 WARN_ON(err == -EMSGSIZE);
4952 kfree_skb(skb);
4953 goto errout;
4954 }
5f75a104 4955 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4956 return;
8d7a76c9
TG		 4957errout:
4958 if (err < 0)
5f75a104 4959 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4960}
4961
339bf98f
TG		 4962static inline size_t inet6_prefix_nlmsg_size(void)
4963{
4964 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4965 + nla_total_size(sizeof(struct in6_addr))
4966 + nla_total_size(sizeof(struct prefix_cacheinfo));
4967}
c5396a31 4968
1da177e4 4969static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4970 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 4971 int event, unsigned int flags)
1da177e4 4972{
6051e2f4
TG		 4973 struct prefixmsg *pmsg;
4974 struct nlmsghdr *nlh;
1da177e4
LT		 4975 struct prefix_cacheinfo ci;
4976
15e47304 4977 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 4978 if (!nlh)
26932566 4979 return -EMSGSIZE;
6051e2f4
TG		 4980
4981 pmsg = nlmsg_data(nlh);
1da177e4 4982 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4983 pmsg->prefix_pad1 = 0;
4984 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4985 pmsg->prefix_ifindex = idev->dev->ifindex;
4986 pmsg->prefix_len = pinfo->prefix_len;
4987 pmsg->prefix_type = pinfo->type;
8a47077a 4988 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4989 pmsg->prefix_flags = 0;
4990 if (pinfo->onlink)
4991 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4992 if (pinfo->autoconf)
4993 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4994
c78679e8
DM		 4995 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4996 goto nla_put_failure;
1da177e4
LT		 4997 ci.preferred_time = ntohl(pinfo->prefered);
4998 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 4999 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5000 goto nla_put_failure;
053c095a
JB		 5001 nlmsg_end(skb, nlh);
5002 return 0;
1da177e4 5003
6051e2f4 5004nla_put_failure:
26932566
PM		 5005 nlmsg_cancel(skb, nlh);
5006 return -EMSGSIZE;
1da177e4
LT		 5007}
5008
1ab1457c 5009static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5010 struct prefix_info *pinfo)
5011{
5012 struct sk_buff *skb;
c346dca1 5013 struct net *net = dev_net(idev->dev);
8c384bfa 5014 int err = -ENOBUFS;
1da177e4 5015
339bf98f 5016 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5017 if (!skb)
8c384bfa
TG		 5018 goto errout;
5019
5020 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5021 if (err < 0) {
5022 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5023 WARN_ON(err == -EMSGSIZE);
5024 kfree_skb(skb);
5025 goto errout;
5026 }
1ce85fe4
PNA		 5027 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5028 return;
8c384bfa
TG		 5029errout:
5030 if (err < 0)
6fda7350 5031 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5032}
5033
1da177e4
LT		 5034static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5035{
63998ac2
ND		 5036 struct net *net = dev_net(ifp->idev->dev);
5037
c15b1cca
HFS		 5038 if (event)
5039 ASSERT_RTNL();
5040
1da177e4
LT		 5041 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5042
5043 switch (event) {
5044 case RTM_NEWADDR:
95c385b4
NH		 5045 /*
5046 * If the address was optimistic
5047 * we inserted the route at the start of
5048 * our DAD process, so we don't need
5049 * to do it again
5050 */
5051 if (!(ifp->rt->rt6i_node))
5052 ip6_ins_rt(ifp->rt);
1da177e4
LT		 5053 if (ifp->idev->cnf.forwarding)
5054 addrconf_join_anycast(ifp);
7996c799 5055 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 5056 addrconf_prefix_route(&ifp->peer_addr, 128,
5057 ifp->idev->dev, 0, 0);
1da177e4
LT		 5058 break;
5059 case RTM_DELADDR:
5060 if (ifp->idev->cnf.forwarding)
5061 addrconf_leave_anycast(ifp);
5062 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5063 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 5064 struct rt6_info *rt;
caeaba79 5065
e7478dfc
ND		 5066 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5067 ifp->idev->dev, 0, 0);
f24062b0
ND		 5068 if (rt && ip6_del_rt(rt))
5069 dst_free(&rt->dst);
caeaba79 5070 }
d8d1f30b 5071 dst_hold(&ifp->rt->dst);
93fa159a 5072
73a8bd74 5073 if (ip6_del_rt(ifp->rt))
d8d1f30b 5074 dst_free(&ifp->rt->dst);
705f1c86
HFS		 5075
5076 rt_genid_bump_ipv6(net);
1da177e4
LT		 5077 break;
5078 }
63998ac2 5079 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5080}
5081
5082static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5083{
8814c4b5 5084 rcu_read_lock_bh();
1da177e4
LT		 5085 if (likely(ifp->idev->dead == 0))
5086 __ipv6_ifa_notify(event, ifp);
8814c4b5 5087 rcu_read_unlock_bh();
1da177e4
LT		 5088}
5089
5090#ifdef CONFIG_SYSCTL
5091
5092static
fe2c6338 5093int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5094 void __user *buffer, size_t *lenp, loff_t *ppos)
5095{
5096 int *valp = ctl->data;
5097 int val = *valp;
88af182e 5098 loff_t pos = *ppos;
fe2c6338 5099 struct ctl_table lctl;
1da177e4
LT		 5100 int ret;
5101
013d97e9
FR		 5102 /*
5103 * ctl->data points to idev->cnf.forwarding, we should
5104 * not modify it until we get the rtnl lock.
5105 */
5106 lctl = *ctl;
5107 lctl.data = &val;
5108
5109 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5110
c8fecf22 5111 if (write)
b325fddb 5112 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5113 if (ret)
5114 *ppos = pos;
1ab1457c 5115 return ret;
1da177e4
LT		 5116}
5117
77751427
ML		 5118static
5119int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5120 void __user *buffer, size_t *lenp, loff_t *ppos)
5121{
5122 struct inet6_dev *idev = ctl->extra1;
5123 int min_mtu = IPV6_MIN_MTU;
5124 struct ctl_table lctl;
5125
5126 lctl = *ctl;
5127 lctl.extra1 = &min_mtu;
5128 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5129
5130 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5131}
5132
56d417b1
BH		 5133static void dev_disable_change(struct inet6_dev *idev)
5134{
75538c2b
CW		 5135 struct netdev_notifier_info info;
5136
56d417b1
BH		 5137 if (!idev || !idev->dev)
5138 return;
5139
75538c2b 5140 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5141 if (idev->cnf.disable_ipv6)
75538c2b 5142 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5143 else
75538c2b 5144 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5145}
5146
5147static void addrconf_disable_change(struct net *net, __s32 newf)
5148{
5149 struct net_device *dev;
5150 struct inet6_dev *idev;
5151
c6d14c84
ED		 5152 rcu_read_lock();
5153 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 5154 idev = __in6_dev_get(dev);
5155 if (idev) {
5156 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5157 idev->cnf.disable_ipv6 = newf;
5158 if (changed)
5159 dev_disable_change(idev);
5160 }
56d417b1 5161 }
c6d14c84 5162 rcu_read_unlock();
56d417b1
BH		 5163}
5164
013d97e9 5165static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5166{
5167 struct net *net;
013d97e9
FR		 5168 int old;
5169
5170 if (!rtnl_trylock())
5171 return restart_syscall();
56d417b1
BH		 5172
5173 net = (struct net *)table->extra2;
013d97e9
FR		 5174 old = *p;
5175 *p = newf;
56d417b1 5176
013d97e9
FR		 5177 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5178 rtnl_unlock();
56d417b1 5179 return 0;
88af182e 5180 }
56d417b1
BH		 5181
5182 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5183 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5184 addrconf_disable_change(net, newf);
013d97e9 5185 } else if ((!newf) ^ (!old))
56d417b1
BH		 5186 dev_disable_change((struct inet6_dev *)table->extra1);
5187
5188 rtnl_unlock();
5189 return 0;
5190}
5191
5192static
fe2c6338 5193int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5194 void __user *buffer, size_t *lenp, loff_t *ppos)
5195{
5196 int *valp = ctl->data;
5197 int val = *valp;
88af182e 5198 loff_t pos = *ppos;
fe2c6338 5199 struct ctl_table lctl;
56d417b1
BH		 5200 int ret;
5201
013d97e9
FR		 5202 /*
5203 * ctl->data points to idev->cnf.disable_ipv6, we should
5204 * not modify it until we get the rtnl lock.
5205 */
5206 lctl = *ctl;
5207 lctl.data = &val;
5208
5209 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5210
5211 if (write)
5212 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5213 if (ret)
5214 *ppos = pos;
56d417b1
BH		 5215 return ret;
5216}
5217
c92d5491 5218static
5219int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5220 void __user *buffer, size_t *lenp, loff_t *ppos)
5221{
5222 int *valp = ctl->data;
5223 int ret;
5224 int old, new;
5225
5226 old = *valp;
5227 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5228 new = *valp;
5229
5230 if (write && old != new) {
5231 struct net *net = ctl->extra2;
5232
5233 if (!rtnl_trylock())
5234 return restart_syscall();
5235
5236 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5237 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5238 NETCONFA_IFINDEX_DEFAULT,
5239 net->ipv6.devconf_dflt);
5240 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5241 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5242 NETCONFA_IFINDEX_ALL,
5243 net->ipv6.devconf_all);
5244 else {
5245 struct inet6_dev *idev = ctl->extra1;
5246
5247 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5248 idev->dev->ifindex,
5249 &idev->cnf);
5250 }
5251 rtnl_unlock();
5252 }
5253
5254 return ret;
5255}
5256
3d1bec99
HFS		 5257static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5258 void __user *buffer, size_t *lenp,
5259 loff_t *ppos)
5260{
5261 int err;
5262 struct in6_addr addr;
5263 char str[IPV6_MAX_STRLEN];
5264 struct ctl_table lctl = *ctl;
622c81d5 5265 struct net *net = ctl->extra2;
3d1bec99
HFS		 5266 struct ipv6_stable_secret *secret = ctl->data;
5267
622c81d5
HFS		 5268 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5269 return -EIO;
5270
3d1bec99
HFS		 5271 lctl.maxlen = IPV6_MAX_STRLEN;
5272 lctl.data = str;
5273
5274 if (!rtnl_trylock())
5275 return restart_syscall();
5276
5277 if (!write && !secret->initialized) {
5278 err = -EIO;
5279 goto out;
5280 }
5281
5282 if (!write) {
5283 err = snprintf(str, sizeof(str), "%pI6",
5284 &secret->secret);
5285 if (err >= sizeof(str)) {
5286 err = -EIO;
5287 goto out;
5288 }
5289 }
5290
5291 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5292 if (err || !write)
5293 goto out;
5294
5295 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5296 err = -EIO;
5297 goto out;
5298 }
5299
5300 secret->initialized = true;
5301 secret->secret = addr;
5302
622c81d5
HFS		 5303 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5304 struct net_device *dev;
5305
5306 for_each_netdev(net, dev) {
5307 struct inet6_dev *idev = __in6_dev_get(dev);
5308
5309 if (idev) {
5310 idev->addr_gen_mode =
5311 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5312 }
5313 }
5314 } else {
5315 struct inet6_dev *idev = ctl->extra1;
5316
5317 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5318 }
5319
3d1bec99
HFS		 5320out:
5321 rtnl_unlock();
5322
5323 return err;
5324}
c92d5491 5325
1da177e4
LT		 5326static struct addrconf_sysctl_table
5327{
5328 struct ctl_table_header *sysctl_header;
fe2c6338 5329 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 5330} addrconf_sysctl __read_mostly = {
1da177e4
LT		 5331 .sysctl_header = NULL,
5332 .addrconf_vars = {
1ab1457c 5333 {
e21e8467
SH		 5334 .procname = "forwarding",
5335 .data = &ipv6_devconf.forwarding,
5336 .maxlen = sizeof(int),
5337 .mode = 0644,
5338 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 5339 },
5340 {
e21e8467
SH		 5341 .procname = "hop_limit",
5342 .data = &ipv6_devconf.hop_limit,
5343 .maxlen = sizeof(int),
5344 .mode = 0644,
5345 .proc_handler = proc_dointvec,
1da177e4
LT		 5346 },
5347 {
e21e8467
SH		 5348 .procname = "mtu",
5349 .data = &ipv6_devconf.mtu6,
5350 .maxlen = sizeof(int),
5351 .mode = 0644,
77751427 5352 .proc_handler = addrconf_sysctl_mtu,
1da177e4
LT		 5353 },
5354 {
e21e8467
SH		 5355 .procname = "accept_ra",
5356 .data = &ipv6_devconf.accept_ra,
5357 .maxlen = sizeof(int),
5358 .mode = 0644,
5359 .proc_handler = proc_dointvec,
1da177e4
LT		 5360 },
5361 {
e21e8467
SH		 5362 .procname = "accept_redirects",
5363 .data = &ipv6_devconf.accept_redirects,
5364 .maxlen = sizeof(int),
5365 .mode = 0644,
5366 .proc_handler = proc_dointvec,
1da177e4
LT		 5367 },
5368 {
e21e8467
SH		 5369 .procname = "autoconf",
5370 .data = &ipv6_devconf.autoconf,
5371 .maxlen = sizeof(int),
5372 .mode = 0644,
5373 .proc_handler = proc_dointvec,
1da177e4
LT		 5374 },
5375 {
e21e8467
SH		 5376 .procname = "dad_transmits",
5377 .data = &ipv6_devconf.dad_transmits,
5378 .maxlen = sizeof(int),
5379 .mode = 0644,
5380 .proc_handler = proc_dointvec,
1da177e4
LT		 5381 },
5382 {
e21e8467
SH		 5383 .procname = "router_solicitations",
5384 .data = &ipv6_devconf.rtr_solicits,
5385 .maxlen = sizeof(int),
5386 .mode = 0644,
5387 .proc_handler = proc_dointvec,
1da177e4
LT		 5388 },
5389 {
e21e8467
SH		 5390 .procname = "router_solicitation_interval",
5391 .data = &ipv6_devconf.rtr_solicit_interval,
5392 .maxlen = sizeof(int),
5393 .mode = 0644,
5394 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5395 },
5396 {
e21e8467
SH		 5397 .procname = "router_solicitation_delay",
5398 .data = &ipv6_devconf.rtr_solicit_delay,
5399 .maxlen = sizeof(int),
5400 .mode = 0644,
5401 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5402 },
5403 {
e21e8467
SH		 5404 .procname = "force_mld_version",
5405 .data = &ipv6_devconf.force_mld_version,
5406 .maxlen = sizeof(int),
5407 .mode = 0644,
5408 .proc_handler = proc_dointvec,
1da177e4 5409 },
fc4eba58
HFS		 5410 {
5411 .procname = "mldv1_unsolicited_report_interval",
5412 .data =
5413 &ipv6_devconf.mldv1_unsolicited_report_interval,
5414 .maxlen = sizeof(int),
5415 .mode = 0644,
5416 .proc_handler = proc_dointvec_ms_jiffies,
5417 },
5418 {
5419 .procname = "mldv2_unsolicited_report_interval",
5420 .data =
5421 &ipv6_devconf.mldv2_unsolicited_report_interval,
5422 .maxlen = sizeof(int),
5423 .mode = 0644,
5424 .proc_handler = proc_dointvec_ms_jiffies,
5425 },
1da177e4 5426 {
e21e8467
SH		 5427 .procname = "use_tempaddr",
5428 .data = &ipv6_devconf.use_tempaddr,
5429 .maxlen = sizeof(int),
5430 .mode = 0644,
5431 .proc_handler = proc_dointvec,
1da177e4
LT		 5432 },
5433 {
e21e8467
SH		 5434 .procname = "temp_valid_lft",
5435 .data = &ipv6_devconf.temp_valid_lft,
5436 .maxlen = sizeof(int),
5437 .mode = 0644,
5438 .proc_handler = proc_dointvec,
1da177e4
LT		 5439 },
5440 {
e21e8467
SH		 5441 .procname = "temp_prefered_lft",
5442 .data = &ipv6_devconf.temp_prefered_lft,
5443 .maxlen = sizeof(int),
5444 .mode = 0644,
5445 .proc_handler = proc_dointvec,
1da177e4
LT		 5446 },
5447 {
e21e8467
SH		 5448 .procname = "regen_max_retry",
5449 .data = &ipv6_devconf.regen_max_retry,
5450 .maxlen = sizeof(int),
5451 .mode = 0644,
5452 .proc_handler = proc_dointvec,
1da177e4
LT		 5453 },
5454 {
e21e8467
SH		 5455 .procname = "max_desync_factor",
5456 .data = &ipv6_devconf.max_desync_factor,
5457 .maxlen = sizeof(int),
5458 .mode = 0644,
5459 .proc_handler = proc_dointvec,
1da177e4 5460 },
1da177e4 5461 {
e21e8467
SH		 5462 .procname = "max_addresses",
5463 .data = &ipv6_devconf.max_addresses,
5464 .maxlen = sizeof(int),
5465 .mode = 0644,
5466 .proc_handler = proc_dointvec,
1da177e4 5467 },
65f5c7c1 5468 {
e21e8467
SH		 5469 .procname = "accept_ra_defrtr",
5470 .data = &ipv6_devconf.accept_ra_defrtr,
5471 .maxlen = sizeof(int),
5472 .mode = 0644,
5473 .proc_handler = proc_dointvec,
65f5c7c1 5474 },
c4fd30eb 5475 {
e21e8467
SH		 5476 .procname = "accept_ra_pinfo",
5477 .data = &ipv6_devconf.accept_ra_pinfo,
5478 .maxlen = sizeof(int),
5479 .mode = 0644,
5480 .proc_handler = proc_dointvec,
c4fd30eb 5481 },
930d6ff2
YH		 5482#ifdef CONFIG_IPV6_ROUTER_PREF
5483 {
e21e8467
SH		 5484 .procname = "accept_ra_rtr_pref",
5485 .data = &ipv6_devconf.accept_ra_rtr_pref,
5486 .maxlen = sizeof(int),
5487 .mode = 0644,
5488 .proc_handler = proc_dointvec,
930d6ff2 5489 },
52e16356 5490 {
e21e8467
SH		 5491 .procname = "router_probe_interval",
5492 .data = &ipv6_devconf.rtr_probe_interval,
5493 .maxlen = sizeof(int),
5494 .mode = 0644,
5495 .proc_handler = proc_dointvec_jiffies,
52e16356 5496 },
fa03ef38 5497#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 5498 {
e21e8467
SH		 5499 .procname = "accept_ra_rt_info_max_plen",
5500 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5501 .maxlen = sizeof(int),
5502 .mode = 0644,
5503 .proc_handler = proc_dointvec,
09c884d4
YH		 5504 },
5505#endif
930d6ff2 5506#endif
fbea49e1 5507 {
e21e8467
SH		 5508 .procname = "proxy_ndp",
5509 .data = &ipv6_devconf.proxy_ndp,
5510 .maxlen = sizeof(int),
5511 .mode = 0644,
c92d5491 5512 .proc_handler = addrconf_sysctl_proxy_ndp,
fbea49e1 5513 },
0bcbc926 5514 {
e21e8467
SH		 5515 .procname = "accept_source_route",
5516 .data = &ipv6_devconf.accept_source_route,
5517 .maxlen = sizeof(int),
5518 .mode = 0644,
5519 .proc_handler = proc_dointvec,
0bcbc926 5520 },
95c385b4
NH		 5521#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5522 {
e21e8467
SH		 5523 .procname = "optimistic_dad",
5524 .data = &ipv6_devconf.optimistic_dad,
5525 .maxlen = sizeof(int),
5526 .mode = 0644,
5527 .proc_handler = proc_dointvec,
95c385b4
NH		 5528
5529 },
7fd2561e
EK		 5530 {
5531 .procname = "use_optimistic",
5532 .data = &ipv6_devconf.use_optimistic,
5533 .maxlen = sizeof(int),
5534 .mode = 0644,
5535 .proc_handler = proc_dointvec,
5536
5537 },
7bc570c8
YH		 5538#endif
5539#ifdef CONFIG_IPV6_MROUTE
5540 {
e21e8467
SH		 5541 .procname = "mc_forwarding",
5542 .data = &ipv6_devconf.mc_forwarding,
5543 .maxlen = sizeof(int),
5544 .mode = 0444,
5545 .proc_handler = proc_dointvec,
7bc570c8 5546 },
95c385b4 5547#endif
778d80be 5548 {
e21e8467
SH		 5549 .procname = "disable_ipv6",
5550 .data = &ipv6_devconf.disable_ipv6,
5551 .maxlen = sizeof(int),
5552 .mode = 0644,
5553 .proc_handler = addrconf_sysctl_disable,
778d80be 5554 },
1b34be74 5555 {
e21e8467
SH		 5556 .procname = "accept_dad",
5557 .data = &ipv6_devconf.accept_dad,
5558 .maxlen = sizeof(int),
5559 .mode = 0644,
5560 .proc_handler = proc_dointvec,
1b34be74 5561 },
f7734fdf 5562 {
f7734fdf
OP		 5563 .procname = "force_tllao",
5564 .data = &ipv6_devconf.force_tllao,
5565 .maxlen = sizeof(int),
5566 .mode = 0644,
5567 .proc_handler = proc_dointvec
5568 },
5cb04436
HFS		 5569 {
5570 .procname = "ndisc_notify",
5571 .data = &ipv6_devconf.ndisc_notify,
5572 .maxlen = sizeof(int),
5573 .mode = 0644,
5574 .proc_handler = proc_dointvec
5575 },
b800c3b9
HFS		 5576 {
5577 .procname = "suppress_frag_ndisc",
5578 .data = &ipv6_devconf.suppress_frag_ndisc,
5579 .maxlen = sizeof(int),
5580 .mode = 0644,
5581 .proc_handler = proc_dointvec
5582 },
d9333196
BG		 5583 {
5584 .procname = "accept_ra_from_local",
5585 .data = &ipv6_devconf.accept_ra_from_local,
5586 .maxlen = sizeof(int),
5587 .mode = 0644,
5588 .proc_handler = proc_dointvec,
5589 },
c2943f14
HH		 5590 {
5591 .procname = "accept_ra_mtu",
5592 .data = &ipv6_devconf.accept_ra_mtu,
5593 .maxlen = sizeof(int),
5594 .mode = 0644,
5595 .proc_handler = proc_dointvec,
5596 },
3d1bec99
HFS		 5597 {
5598 .procname = "stable_secret",
5599 .data = &ipv6_devconf.stable_secret,
5600 .maxlen = IPV6_MAX_STRLEN,
5601 .mode = 0600,
5602 .proc_handler = addrconf_sysctl_stable_secret,
5603 },
1da177e4 5604 {
f8572d8f 5605 /* sentinel */
1da177e4
LT		 5606 }
5607 },
1da177e4
LT		 5608};
5609
bff16c2f 5610static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 5611 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 5612{
5613 int i;
1da177e4 5614 struct addrconf_sysctl_table *t;
6105e293 5615 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 5616
af879cc7 5617 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
63159f29 5618 if (!t)
f68635e6
PE		 5619 goto out;
5620
bcdd553f 5621 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 5622 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 5623 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 5624 t->addrconf_vars[i].extra2 = net;
1da177e4 5625 }
1da177e4 5626
6105e293 5627 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 5628
6105e293 5629 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
63159f29 5630 if (!t->sysctl_header)
6105e293 5631 goto free;
f68635e6
PE		 5632
5633 p->sysctl = t;
95897312 5634 return 0;
1da177e4 5635
f68635e6 5636free:
1da177e4 5637 kfree(t);
f68635e6 5638out:
95897312 5639 return -ENOBUFS;
1da177e4
LT		 5640}
5641
408c4768
PE		 5642static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5643{
5644 struct addrconf_sysctl_table *t;
5645
63159f29 5646 if (!p->sysctl)
408c4768
PE		 5647 return;
5648
5649 t = p->sysctl;
5650 p->sysctl = NULL;
ff538818 5651 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 5652 kfree(t);
5653}
5654
a317a2f1 5655static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 5656{
a317a2f1
WC		 5657 int err;
5658
5659 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5660 return -EINVAL;
5661
5662 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5663 &ndisc_ifinfo_sysctl_change);
5664 if (err)
5665 return err;
5666 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5667 idev, &idev->cnf);
5668 if (err)
5669 neigh_sysctl_unregister(idev->nd_parms);
5670
5671 return err;
f52295a9
PE		 5672}
5673
408c4768 5674static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 5675{
408c4768
PE		 5676 __addrconf_sysctl_unregister(&idev->cnf);
5677 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 5678}
5679
5680
5681#endif
5682
2c8c1e72 5683static int __net_init addrconf_init_net(struct net *net)
e0da5a48 5684{
a79ca223 5685 int err = -ENOMEM;
e0da5a48
PE		 5686 struct ipv6_devconf *all, *dflt;
5687
a79ca223 5688 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 5689 if (!all)
a79ca223 5690 goto err_alloc_all;
e0da5a48 5691
a79ca223 5692 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 5693 if (!dflt)
a79ca223 5694 goto err_alloc_dflt;
e0da5a48 5695
a79ca223
HZ		 5696 /* these will be inherited by all namespaces */
5697 dflt->autoconf = ipv6_defaults.autoconf;
5698 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 5699
3d1bec99
HFS		 5700 dflt->stable_secret.initialized = false;
5701 all->stable_secret.initialized = false;
5702
e0da5a48
PE		 5703 net->ipv6.devconf_all = all;
5704 net->ipv6.devconf_dflt = dflt;
5705
5706#ifdef CONFIG_SYSCTL
f8572d8f 5707 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 5708 if (err < 0)
5709 goto err_reg_all;
5710
f8572d8f 5711 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 5712 if (err < 0)
5713 goto err_reg_dflt;
5714#endif
5715 return 0;
5716
5717#ifdef CONFIG_SYSCTL
5718err_reg_dflt:
5719 __addrconf_sysctl_unregister(all);
5720err_reg_all:
5721 kfree(dflt);
5722#endif
5723err_alloc_dflt:
5724 kfree(all);
5725err_alloc_all:
5726 return err;
5727}
5728
2c8c1e72 5729static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 5730{
5731#ifdef CONFIG_SYSCTL
5732 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5733 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5734#endif
73cf0e92 5735 kfree(net->ipv6.devconf_dflt);
5736 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 5737}
5738
5739static struct pernet_operations addrconf_ops = {
5740 .init = addrconf_init_net,
5741 .exit = addrconf_exit_net,
5742};
5743
207895fd 5744static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 5745 .family = AF_INET6,
5746 .fill_link_af = inet6_fill_link_af,
5747 .get_link_af_size = inet6_get_link_af_size,
11b1f828 5748 .validate_link_af = inet6_validate_link_af,
f53adae4 5749 .set_link_af = inet6_set_link_af,
b382b191
TG		 5750};
5751
1da177e4
LT		 5752/*
5753 * Init / cleanup code
5754 */
5755
5756int __init addrconf_init(void)
5757{
a317a2f1 5758 struct inet6_dev *idev;
c2e21293 5759 int i, err;
2a8cc6c8 5760
e21e8467
SH		 5761 err = ipv6_addr_label_init();
5762 if (err < 0) {
f3213831
JP		 5763 pr_crit("%s: cannot initialize default policy table: %d\n",
5764 __func__, err);
2cc6d2bf 5765 goto out;
2a8cc6c8 5766 }
1da177e4 5767
2cc6d2bf
NH		 5768 err = register_pernet_subsys(&addrconf_ops);
5769 if (err < 0)
5770 goto out_addrlabel;
e0da5a48 5771
c15b1cca
HFS		 5772 addrconf_wq = create_workqueue("ipv6_addrconf");
5773 if (!addrconf_wq) {
5774 err = -ENOMEM;
5775 goto out_nowq;
5776 }
5777
1da177e4
LT		 5778 /* The addrconf netdev notifier requires that loopback_dev
5779 * has it's ipv6 private information allocated and setup
5780 * before it can bring up and give link-local addresses
5781 * to other devices which are up.
5782 *
5783 * Unfortunately, loopback_dev is not necessarily the first
5784 * entry in the global dev_base list of net devices. In fact,
5785 * it is likely to be the very last entry on that list.
5786 * So this causes the notifier registry below to try and
5787 * give link-local addresses to all devices besides loopback_dev
5788 * first, then loopback_dev, which cases all the non-loopback_dev
5789 * devices to fail to get a link-local address.
5790 *
5791 * So, as a temporary fix, allocate the ipv6 structure for
5792 * loopback_dev first by hand.
5793 * Longer term, all of the dependencies ipv6 has upon the loopback
5794 * device and it being up should be removed.
5795 */
5796 rtnl_lock();
a317a2f1 5797 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 5798 rtnl_unlock();
a317a2f1
WC		 5799 if (IS_ERR(idev)) {
5800 err = PTR_ERR(idev);
e0da5a48 5801 goto errlo;
a317a2f1 5802 }
1da177e4 5803
c2e21293 5804 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5805 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5806
1da177e4
LT		 5807 register_netdevice_notifier(&ipv6_dev_notf);
5808
c15b1cca 5809 addrconf_verify();
c127ea2c 5810
3678a9d8 5811 rtnl_af_register(&inet6_ops);
b382b191 5812
c7ac8679
GR		 5813 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5814 NULL);
c127ea2c
TG		 5815 if (err < 0)
5816 goto errout;
5817
5818 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 5819 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5820 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5821 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5822 inet6_dump_ifaddr, NULL);
5823 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5824 inet6_dump_ifmcaddr, NULL);
5825 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5826 inet6_dump_ifacaddr, NULL);
76f8f6cb 5827 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 5828 inet6_netconf_dump_devconf, NULL);
c127ea2c 5829
2a8cc6c8
YH		 5830 ipv6_addr_label_rtnl_register();
5831
1da177e4 5832 return 0;
c127ea2c 5833errout:
b382b191 5834 rtnl_af_unregister(&inet6_ops);
c127ea2c 5835 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5836errlo:
c15b1cca
HFS		 5837 destroy_workqueue(addrconf_wq);
5838out_nowq:
e0da5a48 5839 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 5840out_addrlabel:
5841 ipv6_addr_label_cleanup();
5842out:
c127ea2c 5843 return err;
1da177e4
LT		 5844}
5845
09f7709f 5846void addrconf_cleanup(void)
1da177e4 5847{
176c39af 5848 struct net_device *dev;
1da177e4
LT		 5849 int i;
5850
5851 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5852 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 5853 ipv6_addr_label_cleanup();
1da177e4
LT		 5854
5855 rtnl_lock();
5856
b382b191
TG		 5857 __rtnl_af_unregister(&inet6_ops);
5858
176c39af
DL		 5859 /* clean dev list */
5860 for_each_netdev(&init_net, dev) {
5861 if (__in6_dev_get(dev) == NULL)
5862 continue;
5863 addrconf_ifdown(dev, 1);
5864 }
5865 addrconf_ifdown(init_net.loopback_dev, 2);
5866
1da177e4
LT		 5867 /*
5868 * Check hash table.
5869 */
5c578aed 5870 spin_lock_bh(&addrconf_hash_lock);
c2e21293 5871 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5872 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 5873 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 5874 cancel_delayed_work(&addr_chk_work);
1da177e4 5875 rtnl_unlock();
c15b1cca
HFS		 5876
5877 destroy_workqueue(addrconf_wq);
1da177e4 5878}
Linux kernel - Deliverables
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