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r8152: support the new RTL8153 chip
[mirror_ubuntu-jammy-kernel.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
1da177e4
LT		 46#include <linux/socket.h>
47#include <linux/sockios.h>
1da177e4 48#include <linux/net.h>
3d1bec99 49#include <linux/inet.h>
1da177e4
LT		 50#include <linux/in6.h>
51#include <linux/netdevice.h>
1823730f 52#include <linux/if_addr.h>
1da177e4
LT		 53#include <linux/if_arp.h>
54#include <linux/if_arcnet.h>
55#include <linux/if_infiniband.h>
56#include <linux/route.h>
57#include <linux/inetdevice.h>
58#include <linux/init.h>
5a0e3ad6 59#include <linux/slab.h>
1da177e4
LT		 60#ifdef CONFIG_SYSCTL
61#include <linux/sysctl.h>
62#endif
4fc268d2 63#include <linux/capability.h>
1da177e4
LT		 64#include <linux/delay.h>
65#include <linux/notifier.h>
543537bd 66#include <linux/string.h>
ddbe5032 67#include <linux/hash.h>
1da177e4 68
457c4cbc 69#include <net/net_namespace.h>
1da177e4
LT		 70#include <net/sock.h>
71#include <net/snmp.h>
72
06a4c1c5 73#include <net/af_ieee802154.h>
cb6bf355 74#include <net/firewire.h>
1da177e4
LT		 75#include <net/ipv6.h>
76#include <net/protocol.h>
77#include <net/ndisc.h>
78#include <net/ip6_route.h>
79#include <net/addrconf.h>
80#include <net/tcp.h>
81#include <net/ip.h>
5d620266 82#include <net/netlink.h>
f24e3d65 83#include <net/pkt_sched.h>
1da177e4
LT		 84#include <linux/if_tunnel.h>
85#include <linux/rtnetlink.h>
f3a1bfb1 86#include <linux/netconf.h>
1da177e4 87#include <linux/random.h>
e21e8467 88#include <linux/uaccess.h>
7f7d9a6b 89#include <asm/unaligned.h>
1da177e4
LT		 90
91#include <linux/proc_fs.h>
92#include <linux/seq_file.h>
bc3b2d7f 93#include <linux/export.h>
1da177e4
LT		 94
95/* Set to 3 to get tracing... */
96#define ACONF_DEBUG 2
97
98#if ACONF_DEBUG >= 3
ba3542e1 99#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
1da177e4 100#else
ba3542e1 101#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
1da177e4
LT		 102#endif
103
104#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e 105
3d1bec99
HFS		 106#define IPV6_MAX_STRLEN \
107 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
108
18a31e1e
TG		 109static inline u32 cstamp_delta(unsigned long cstamp)
110{
111 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
112}
1da177e4
LT		 113
114#ifdef CONFIG_SYSCTL
a317a2f1 115static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 116static void addrconf_sysctl_unregister(struct inet6_dev *idev);
117#else
a317a2f1 118static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 119{
a317a2f1 120 return 0;
408c4768
PE		 121}
122
123static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
124{
125}
1da177e4
LT		 126#endif
127
eb7e0575
SD		 128static void __ipv6_regen_rndid(struct inet6_dev *idev);
129static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 130static void ipv6_regen_rndid(unsigned long data);
1da177e4 131
1b34be74 132static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4 133static int ipv6_count_addresses(struct inet6_dev *idev);
622c81d5
HFS		 134static int ipv6_generate_stable_address(struct in6_addr *addr,
135 u8 dad_count,
136 const struct inet6_dev *idev);
1da177e4
LT		 137
138/*
139 * Configured unicast address hash table
140 */
c2e21293 141static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 142static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 143
c15b1cca
HFS		 144static void addrconf_verify(void);
145static void addrconf_verify_rtnl(void);
146static void addrconf_verify_work(struct work_struct *);
1da177e4 147
c15b1cca
HFS		 148static struct workqueue_struct *addrconf_wq;
149static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 150
151static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
152static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
153
93d9b7d7
JP		 154static void addrconf_type_change(struct net_device *dev,
155 unsigned long event);
1da177e4
LT		 156static int addrconf_ifdown(struct net_device *dev, int how);
157
21caa662
RK		 158static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
159 int plen,
160 const struct net_device *dev,
161 u32 flags, u32 noflags);
162
cf22f9a2 163static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 164static void addrconf_dad_work(struct work_struct *w);
1da177e4 165static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 166static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 167static void addrconf_rs_timer(unsigned long data);
168static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
169static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
170
1ab1457c 171static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 172 struct prefix_info *pinfo);
3e81c6da
DM		 173static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
174 struct net_device *dev);
1da177e4 175
888c848e 176static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 177 .forwarding = 0,
178 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
179 .mtu6 = IPV6_MIN_MTU,
180 .accept_ra = 1,
181 .accept_redirects = 1,
182 .autoconf = 1,
183 .force_mld_version = 0,
fc4eba58
HFS		 184 .mldv1_unsolicited_report_interval = 10 * HZ,
185 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 186 .dad_transmits = 1,
187 .rtr_solicits = MAX_RTR_SOLICITATIONS,
188 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
189 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 190 .use_tempaddr = 0,
1da177e4
LT		 191 .temp_valid_lft = TEMP_VALID_LIFETIME,
192 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
193 .regen_max_retry = REGEN_MAX_RETRY,
194 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 195 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 196 .accept_ra_defrtr = 1,
d9333196 197 .accept_ra_from_local = 0,
c4fd30eb 198 .accept_ra_pinfo = 1,
930d6ff2
YH		 199#ifdef CONFIG_IPV6_ROUTER_PREF
200 .accept_ra_rtr_pref = 1,
52e16356 201 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 202#ifdef CONFIG_IPV6_ROUTE_INFO
203 .accept_ra_rt_info_max_plen = 0,
204#endif
930d6ff2 205#endif
fbea49e1 206 .proxy_ndp = 0,
0bcbc926 207 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 208 .disable_ipv6 = 0,
1b34be74 209 .accept_dad = 1,
b800c3b9 210 .suppress_frag_ndisc = 1,
c2943f14 211 .accept_ra_mtu = 1,
3d1bec99
HFS		 212 .stable_secret = {
213 .initialized = false,
214 }
1da177e4
LT		 215};
216
ab32ea5d 217static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 218 .forwarding = 0,
219 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
220 .mtu6 = IPV6_MIN_MTU,
221 .accept_ra = 1,
222 .accept_redirects = 1,
223 .autoconf = 1,
fc4eba58
HFS		 224 .force_mld_version = 0,
225 .mldv1_unsolicited_report_interval = 10 * HZ,
226 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 227 .dad_transmits = 1,
228 .rtr_solicits = MAX_RTR_SOLICITATIONS,
229 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
230 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 231 .use_tempaddr = 0,
232 .temp_valid_lft = TEMP_VALID_LIFETIME,
233 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
234 .regen_max_retry = REGEN_MAX_RETRY,
235 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 236 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 237 .accept_ra_defrtr = 1,
d9333196 238 .accept_ra_from_local = 0,
c4fd30eb 239 .accept_ra_pinfo = 1,
930d6ff2
YH		 240#ifdef CONFIG_IPV6_ROUTER_PREF
241 .accept_ra_rtr_pref = 1,
52e16356 242 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 243#ifdef CONFIG_IPV6_ROUTE_INFO
244 .accept_ra_rt_info_max_plen = 0,
245#endif
930d6ff2 246#endif
fbea49e1 247 .proxy_ndp = 0,
0bcbc926 248 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 249 .disable_ipv6 = 0,
1b34be74 250 .accept_dad = 1,
b800c3b9 251 .suppress_frag_ndisc = 1,
c2943f14 252 .accept_ra_mtu = 1,
3d1bec99
HFS		 253 .stable_secret = {
254 .initialized = false,
255 },
1da177e4
LT		 256};
257
f24e3d65 258/* Check if a valid qdisc is available */
05297949 259static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 260{
05297949 261 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 262}
263
b7b1bfce 264static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 265{
b7b1bfce
HFS		 266 if (del_timer(&idev->rs_timer))
267 __in6_dev_put(idev);
268}
269
c15b1cca 270static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 271{
c15b1cca 272 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 273 __in6_ifa_put(ifp);
274}
275
b7b1bfce
HFS		 276static void addrconf_mod_rs_timer(struct inet6_dev *idev,
277 unsigned long when)
278{
279 if (!timer_pending(&idev->rs_timer))
280 in6_dev_hold(idev);
281 mod_timer(&idev->rs_timer, jiffies + when);
282}
1da177e4 283
c15b1cca
HFS		 284static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
285 unsigned long delay)
1da177e4 286{
c15b1cca 287 if (!delayed_work_pending(&ifp->dad_work))
1da177e4 288 in6_ifa_hold(ifp);
c15b1cca 289 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
1da177e4
LT		 290}
291
7f7d9a6b
HX		 292static int snmp6_alloc_dev(struct inet6_dev *idev)
293{
827da44c
JS		 294 int i;
295
698365fa
WC		 296 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
297 if (!idev->stats.ipv6)
7f7d9a6b 298 goto err_ip;
827da44c
JS		 299
300 for_each_possible_cpu(i) {
301 struct ipstats_mib *addrconf_stats;
698365fa 302 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 303 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 304 }
305
306
be281e55
ED		 307 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
308 GFP_KERNEL);
309 if (!idev->stats.icmpv6dev)
7f7d9a6b 310 goto err_icmp;
be281e55
ED		 311 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
312 GFP_KERNEL);
313 if (!idev->stats.icmpv6msgdev)
14878f75 314 goto err_icmpmsg;
7f7d9a6b
HX		 315
316 return 0;
317
14878f75 318err_icmpmsg:
be281e55 319 kfree(idev->stats.icmpv6dev);
7f7d9a6b 320err_icmp:
698365fa 321 free_percpu(idev->stats.ipv6);
7f7d9a6b 322err_ip:
aaf70ec7 323 return -ENOMEM;
7f7d9a6b
HX		 324}
325
8e5e8f30 326static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 327{
328 struct inet6_dev *ndev;
a317a2f1 329 int err = -ENOMEM;
1da177e4
LT		 330
331 ASSERT_RTNL();
332
333 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 334 return ERR_PTR(-EINVAL);
1da177e4 335
1ab1457c 336 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
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
c0b8da1e
YH		 1361static int __ipv6_dev_get_saddr(struct net *net,
1362 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1363 struct inet6_dev *idev,
1364 struct ipv6_saddr_score *scores,
1365 int hiscore_idx)
9131f3de 1366{
c0b8da1e 1367 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de
YH		 1368
1369 read_lock_bh(&idev->lock);
1370 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1371 int i;
1372
1373 /*
1374 * - Tentative Address (RFC2462 section 5.4)
1375 * - A tentative address is not considered
1376 * "assigned to an interface" in the traditional
1377 * sense, unless it is also flagged as optimistic.
1378 * - Candidate Source Address (section 4)
1379 * - In any case, anycast addresses, multicast
1380 * addresses, and the unspecified address MUST
1381 * NOT be included in a candidate set.
1382 */
1383 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1384 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1385 continue;
1386
1387 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1388
1389 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1390 score->addr_type & IPV6_ADDR_MULTICAST)) {
1391 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1392 idev->dev->name);
1393 continue;
1394 }
1395
1396 score->rule = -1;
1397 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1398
1399 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1400 int minihiscore, miniscore;
1401
1402 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1403 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1404
1405 if (minihiscore > miniscore) {
1406 if (i == IPV6_SADDR_RULE_SCOPE &&
1407 score->scopedist > 0) {
1408 /*
1409 * special case:
1410 * each remaining entry
1411 * has too small (not enough)
1412 * scope, because ifa entries
1413 * are sorted by their scope
1414 * values.
1415 */
1416 goto out;
1417 }
1418 break;
1419 } else if (minihiscore < miniscore) {
1420 if (hiscore->ifa)
1421 in6_ifa_put(hiscore->ifa);
1422
1423 in6_ifa_hold(score->ifa);
1424
1425 swap(hiscore, score);
c0b8da1e 1426 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1427
1428 /* restore our iterator */
1429 score->ifa = hiscore->ifa;
1430
1431 break;
1432 }
1433 }
1434 }
1435out:
1436 read_unlock_bh(&idev->lock);
c0b8da1e 1437 return hiscore_idx;
9131f3de
YH		 1438}
1439
b3f644fc 1440int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1441 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1442 struct in6_addr *saddr)
1da177e4 1443{
c0b8da1e 1444 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1445 struct ipv6_saddr_dst dst;
9131f3de 1446 struct inet6_dev *idev;
072047e4 1447 struct net_device *dev;
a9b05723 1448 int dst_type;
9131f3de 1449 bool use_oif_addr = false;
c0b8da1e 1450 int hiscore_idx = 0;
1da177e4 1451
a9b05723
YH		 1452 dst_type = __ipv6_addr_type(daddr);
1453 dst.addr = daddr;
1454 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1455 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1456 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1457 dst.prefs = prefs;
a9b05723 1458
c0b8da1e
YH		 1459 scores[hiscore_idx].rule = -1;
1460 scores[hiscore_idx].ifa = NULL;
1da177e4 1461
8814c4b5 1462 rcu_read_lock();
1da177e4 1463
9131f3de
YH		 1464 /* Candidate Source Address (section 4)
1465 * - multicast and link-local destination address,
1466 * the set of candidate source address MUST only
1467 * include addresses assigned to interfaces
1468 * belonging to the same link as the outgoing
1469 * interface.
1470 * (- For site-local destination addresses, the
1471 * set of candidate source addresses MUST only
1472 * include addresses assigned to interfaces
1473 * belonging to the same site as the outgoing
1474 * interface.)
1475 */
1476 if (dst_dev) {
1477 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1478 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) {
1479 idev = __in6_dev_get(dst_dev);
1480 use_oif_addr = true;
1481 }
1482 }
a9b05723 1483
9131f3de 1484 if (use_oif_addr) {
c0b8da1e 1485 if (idev)
c15df306 1486 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de
YH		 1487 } else {
1488 for_each_netdev_rcu(net, dev) {
1489 idev = __in6_dev_get(dev);
1490 if (!idev)
072047e4 1491 continue;
c15df306 1492 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1493 }
1494 }
8814c4b5 1495 rcu_read_unlock();
1da177e4 1496
c0b8da1e 1497 hiscore = &scores[hiscore_idx];
a9b05723 1498 if (!hiscore->ifa)
072047e4 1499 return -EADDRNOTAVAIL;
1ab1457c 1500
4e3fd7a0 1501 *saddr = hiscore->ifa->addr;
a9b05723 1502 in6_ifa_put(hiscore->ifa);
072047e4 1503 return 0;
1da177e4 1504}
5e5f3f0f 1505EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1506
8965779d 1507int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1508 u32 banned_flags)
b7b1bfce
HFS		 1509{
1510 struct inet6_ifaddr *ifp;
1511 int err = -EADDRNOTAVAIL;
1512
602582ca
HFS		 1513 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1514 if (ifp->scope > IFA_LINK)
1515 break;
b7b1bfce
HFS		 1516 if (ifp->scope == IFA_LINK &&
1517 !(ifp->flags & banned_flags)) {
1518 *addr = ifp->addr;
1519 err = 0;
1520 break;
1521 }
1522 }
1523 return err;
1524}
1525
95c385b4 1526int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1527 u32 banned_flags)
1da177e4
LT		 1528{
1529 struct inet6_dev *idev;
1530 int err = -EADDRNOTAVAIL;
1531
8814c4b5 1532 rcu_read_lock();
e21e8467
SH		 1533 idev = __in6_dev_get(dev);
1534 if (idev) {
1da177e4 1535 read_lock_bh(&idev->lock);
b7b1bfce 1536 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1537 read_unlock_bh(&idev->lock);
1538 }
8814c4b5 1539 rcu_read_unlock();
1da177e4
LT		 1540 return err;
1541}
1542
1543static int ipv6_count_addresses(struct inet6_dev *idev)
1544{
1545 int cnt = 0;
1546 struct inet6_ifaddr *ifp;
1547
1548 read_lock_bh(&idev->lock);
502a2ffd 1549 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1550 cnt++;
1551 read_unlock_bh(&idev->lock);
1552 return cnt;
1553}
1554
b71d1d42 1555int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1556 const struct net_device *dev, int strict)
c58da4c6
EK		 1557{
1558 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1559}
1560EXPORT_SYMBOL(ipv6_chk_addr);
1561
1562int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1563 const struct net_device *dev, int strict,
1564 u32 banned_flags)
1da177e4 1565{
eedf042a 1566 struct inet6_ifaddr *ifp;
ddbe5032 1567 unsigned int hash = inet6_addr_hash(addr);
c58da4c6 1568 u32 ifp_flags;
1da177e4 1569
5c578aed 1570 rcu_read_lock_bh();
b67bfe0d 1571 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1572 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1573 continue;
c58da4c6
EK		 1574 /* Decouple optimistic from tentative for evaluation here.
1575 * Ban optimistic addresses explicitly, when required.
1576 */
1577 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1578 ? (ifp->flags&~IFA_F_TENTATIVE)
1579 : ifp->flags;
1da177e4 1580 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1581 !(ifp_flags&banned_flags) &&
63159f29 1582 (!dev || ifp->idev->dev == dev ||
eedf042a
SH		 1583 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1584 rcu_read_unlock_bh();
1585 return 1;
1da177e4
LT		 1586 }
1587 }
5c578aed 1588
eedf042a
SH		 1589 rcu_read_unlock_bh();
1590 return 0;
1da177e4 1591}
c58da4c6 1592EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1593
3e81c6da
DM		 1594static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1595 struct net_device *dev)
1da177e4 1596{
ddbe5032 1597 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1598 struct inet6_ifaddr *ifp;
1da177e4 1599
b67bfe0d 1600 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1601 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1602 continue;
1da177e4 1603 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1604 if (!dev || ifp->idev->dev == dev)
3e81c6da 1605 return true;
1da177e4
LT		 1606 }
1607 }
3e81c6da 1608 return false;
1da177e4
LT		 1609}
1610
7df37ff3
CB		 1611/* Compares an address/prefix_len with addresses on device @dev.
1612 * If one is found it returns true.
1613 */
1614bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1615 const unsigned int prefix_len, struct net_device *dev)
1616{
1617 struct inet6_dev *idev;
1618 struct inet6_ifaddr *ifa;
1619 bool ret = false;
1620
1621 rcu_read_lock();
1622 idev = __in6_dev_get(dev);
1623 if (idev) {
1624 read_lock_bh(&idev->lock);
1625 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1626 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1627 if (ret)
1628 break;
1629 }
1630 read_unlock_bh(&idev->lock);
1631 }
1632 rcu_read_unlock();
1633
1634 return ret;
1635}
1636EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1637
b71d1d42 1638int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1639{
1640 struct inet6_dev *idev;
1641 struct inet6_ifaddr *ifa;
1642 int onlink;
1643
1644 onlink = 0;
1645 rcu_read_lock();
1646 idev = __in6_dev_get(dev);
1647 if (idev) {
1648 read_lock_bh(&idev->lock);
502a2ffd 1649 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1650 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1651 ifa->prefix_len);
1652 if (onlink)
1653 break;
1654 }
1655 read_unlock_bh(&idev->lock);
1656 }
1657 rcu_read_unlock();
1658 return onlink;
1659}
52eeeb84
YH		 1660EXPORT_SYMBOL(ipv6_chk_prefix);
1661
9acd9f3a 1662struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1663 struct net_device *dev, int strict)
1da177e4 1664{
b79d1d54 1665 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1666 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1667
5c578aed 1668 rcu_read_lock_bh();
b67bfe0d 1669 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1670 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1671 continue;
1da177e4 1672 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1673 if (!dev || ifp->idev->dev == dev ||
1da177e4 1674 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1675 result = ifp;
1da177e4
LT		 1676 in6_ifa_hold(ifp);
1677 break;
1678 }
1679 }
1680 }
5c578aed 1681 rcu_read_unlock_bh();
1da177e4 1682
b79d1d54 1683 return result;
1da177e4
LT		 1684}
1685
1da177e4
LT		 1686/* Gets referenced address, destroys ifaddr */
1687
cc411d0b 1688static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1689{
1da177e4
LT		 1690 if (ifp->flags&IFA_F_PERMANENT) {
1691 spin_lock_bh(&ifp->lock);
c15b1cca 1692 addrconf_del_dad_work(ifp);
1da177e4 1693 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1694 if (dad_failed)
1695 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1696 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1697 if (dad_failed)
1698 ipv6_ifa_notify(0, ifp);
1da177e4 1699 in6_ifa_put(ifp);
1da177e4
LT		 1700 } else if (ifp->flags&IFA_F_TEMPORARY) {
1701 struct inet6_ifaddr *ifpub;
1702 spin_lock_bh(&ifp->lock);
1703 ifpub = ifp->ifpub;
1704 if (ifpub) {
1705 in6_ifa_hold(ifpub);
1706 spin_unlock_bh(&ifp->lock);
1707 ipv6_create_tempaddr(ifpub, ifp);
1708 in6_ifa_put(ifpub);
1709 } else {
1710 spin_unlock_bh(&ifp->lock);
1711 }
1712 ipv6_del_addr(ifp);
c15b1cca 1713 } else {
1da177e4 1714 ipv6_del_addr(ifp);
c15b1cca 1715 }
1da177e4
LT		 1716}
1717
f2344a13
HX		 1718static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1719{
1720 int err = -ENOENT;
1721
8e8e676d 1722 spin_lock_bh(&ifp->lock);
f2344a13
HX		 1723 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1724 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1725 err = 0;
1726 }
8e8e676d 1727 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 1728
1729 return err;
1730}
1731
3c21edbd
YH		 1732void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1733{
5f40ef77 1734 struct in6_addr addr;
1b34be74 1735 struct inet6_dev *idev = ifp->idev;
1855b7c3 1736 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 1737
853dc2e0
UB		 1738 if (addrconf_dad_end(ifp)) {
1739 in6_ifa_put(ifp);
f2344a13 1740 return;
853dc2e0 1741 }
f2344a13 1742
e87cc472
JP		 1743 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1744 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1745
5f40ef77
HFS		 1746 spin_lock_bh(&ifp->lock);
1747
1748 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1749 int scope = ifp->scope;
1750 u32 flags = ifp->flags;
1751 struct in6_addr new_addr;
1752 struct inet6_ifaddr *ifp2;
1753 u32 valid_lft, preferred_lft;
1754 int pfxlen = ifp->prefix_len;
5f40ef77
HFS		 1755 int retries = ifp->stable_privacy_retry + 1;
1756
1855b7c3 1757 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 1758 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1759 ifp->idev->dev->name);
1760 goto errdad;
1761 }
1762
1763 new_addr = ifp->addr;
1764 if (ipv6_generate_stable_address(&new_addr, retries,
1765 idev))
1766 goto errdad;
1767
1768 valid_lft = ifp->valid_lft;
1769 preferred_lft = ifp->prefered_lft;
1770
1771 spin_unlock_bh(&ifp->lock);
1b34be74 1772
5f40ef77
HFS		 1773 if (idev->cnf.max_addresses &&
1774 ipv6_count_addresses(idev) >=
1775 idev->cnf.max_addresses)
1776 goto lock_errdad;
1777
1778 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1779 ifp->idev->dev->name);
1780
1781 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1782 scope, flags, valid_lft,
1783 preferred_lft);
1784 if (IS_ERR(ifp2))
1785 goto lock_errdad;
1786
1787 spin_lock_bh(&ifp2->lock);
1788 ifp2->stable_privacy_retry = retries;
1789 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1790 spin_unlock_bh(&ifp2->lock);
1791
1855b7c3 1792 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 1793 in6_ifa_put(ifp2);
1794lock_errdad:
1795 spin_lock_bh(&ifp->lock);
1796 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1b34be74
YH		 1797 addr.s6_addr32[0] = htonl(0xfe800000);
1798 addr.s6_addr32[1] = 0;
1799
1800 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1801 ipv6_addr_equal(&ifp->addr, &addr)) {
1802 /* DAD failed for link-local based on MAC address */
1803 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1804
f3213831 1805 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1806 ifp->idev->dev->name);
1b34be74
YH		 1807 }
1808 }
1809
5f40ef77 1810errdad:
c15b1cca
HFS		 1811 /* transition from _POSTDAD to _ERRDAD */
1812 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 1813 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 1814
1815 addrconf_mod_dad_work(ifp, 0);
3c21edbd 1816}
1da177e4 1817
a9ed4a29
SD		 1818/* Join to solicited addr multicast group.
1819 * caller must hold RTNL */
b71d1d42 1820void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1821{
1822 struct in6_addr maddr;
1823
1824 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1825 return;
1826
1827 addrconf_addr_solict_mult(addr, &maddr);
1828 ipv6_dev_mc_inc(dev, &maddr);
1829}
1830
a9ed4a29 1831/* caller must hold RTNL */
b71d1d42 1832void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1833{
1834 struct in6_addr maddr;
1835
1836 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1837 return;
1838
1839 addrconf_addr_solict_mult(addr, &maddr);
1840 __ipv6_dev_mc_dec(idev, &maddr);
1841}
1842
a9ed4a29 1843/* caller must hold RTNL */
20380731 1844static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1845{
1846 struct in6_addr addr;
c15b1cca 1847
88ad3149 1848 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 1849 return;
1da177e4
LT		 1850 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1851 if (ipv6_addr_any(&addr))
1852 return;
013b4d90 1853 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 1854}
1855
a9ed4a29 1856/* caller must hold RTNL */
20380731 1857static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1858{
1859 struct in6_addr addr;
c15b1cca 1860
88ad3149 1861 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 1862 return;
1da177e4
LT		 1863 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1864 if (ipv6_addr_any(&addr))
1865 return;
1866 __ipv6_dev_ac_dec(ifp->idev, &addr);
1867}
1868
073a8e0e
YH		 1869static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1870{
1871 if (dev->addr_len != ETH_ALEN)
1872 return -1;
1873 memcpy(eui, dev->dev_addr, 3);
1874 memcpy(eui + 5, dev->dev_addr + 3, 3);
1875
1876 /*
1877 * The zSeries OSA network cards can be shared among various
1878 * OS instances, but the OSA cards have only one MAC address.
1879 * This leads to duplicate address conflicts in conjunction
1880 * with IPv6 if more than one instance uses the same card.
1881 *
1882 * The driver for these cards can deliver a unique 16-bit
1883 * identifier for each instance sharing the same card. It is
1884 * placed instead of 0xFFFE in the interface identifier. The
1885 * "u" bit of the interface identifier is not inverted in this
1886 * case. Hence the resulting interface identifier has local
1887 * scope according to RFC2373.
1888 */
1889 if (dev->dev_id) {
1890 eui[3] = (dev->dev_id >> 8) & 0xFF;
1891 eui[4] = dev->dev_id & 0xFF;
1892 } else {
1893 eui[3] = 0xFF;
1894 eui[4] = 0xFE;
1895 eui[0] ^= 2;
1896 }
1897 return 0;
1898}
1899
06a4c1c5 1900static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1901{
1902 if (dev->addr_len != IEEE802154_ADDR_LEN)
1903 return -1;
1904 memcpy(eui, dev->dev_addr, 8);
5e98a36e 1905 eui[0] ^= 2;
06a4c1c5 1906 return 0;
1907}
1908
cb6bf355
YH		 1909static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1910{
1911 union fwnet_hwaddr *ha;
1912
1913 if (dev->addr_len != FWNET_ALEN)
1914 return -1;
1915
1916 ha = (union fwnet_hwaddr *)dev->dev_addr;
1917
1918 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1919 eui[0] ^= 2;
1920 return 0;
1921}
1922
073a8e0e
YH		 1923static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1924{
1925 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1926 if (dev->addr_len != ARCNET_ALEN)
1927 return -1;
1928 memset(eui, 0, 7);
8e5e8f30 1929 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1930 return 0;
1931}
1932
1933static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1934{
1935 if (dev->addr_len != INFINIBAND_ALEN)
1936 return -1;
1937 memcpy(eui, dev->dev_addr + 12, 8);
1938 eui[0] |= 2;
1939 return 0;
1940}
1941
c61393ea 1942static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1943{
9af28511
SH		 1944 if (addr == 0)
1945 return -1;
dfd982ba
YH		 1946 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1947 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1948 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1949 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1950 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1951 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1952 eui[1] = 0;
1953 eui[2] = 0x5E;
1954 eui[3] = 0xFE;
1955 memcpy(eui + 4, &addr, 4);
1956 return 0;
1957}
dfd982ba
YH		 1958
1959static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1960{
1961 if (dev->priv_flags & IFF_ISATAP)
1962 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1963 return -1;
1964}
1965
aee80b54 1966static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1967{
1968 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1969}
1970
e837735e
ND		 1971static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1972{
1973 memcpy(eui, dev->perm_addr, 3);
1974 memcpy(eui + 5, dev->perm_addr + 3, 3);
1975 eui[3] = 0xFF;
1976 eui[4] = 0xFE;
1977 eui[0] ^= 2;
1978 return 0;
1979}
1980
1da177e4
LT		 1981static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1982{
1983 switch (dev->type) {
1984 case ARPHRD_ETHER:
1985 case ARPHRD_FDDI:
073a8e0e 1986 return addrconf_ifid_eui48(eui, dev);
1da177e4 1987 case ARPHRD_ARCNET:
073a8e0e 1988 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1989 case ARPHRD_INFINIBAND:
073a8e0e 1990 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1991 case ARPHRD_SIT:
dfd982ba 1992 return addrconf_ifid_sit(eui, dev);
aee80b54 1993 case ARPHRD_IPGRE:
1994 return addrconf_ifid_gre(eui, dev);
e74bccb8 1995 case ARPHRD_6LOWPAN:
06a4c1c5 1996 case ARPHRD_IEEE802154:
1997 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 1998 case ARPHRD_IEEE1394:
1999 return addrconf_ifid_ieee1394(eui, dev);
e837735e
ND		 2000 case ARPHRD_TUNNEL6:
2001 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2002 }
2003 return -1;
2004}
2005
2006static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2007{
2008 int err = -1;
2009 struct inet6_ifaddr *ifp;
2010
2011 read_lock_bh(&idev->lock);
602582ca
HFS		 2012 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2013 if (ifp->scope > IFA_LINK)
2014 break;
1da177e4
LT		 2015 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2016 memcpy(eui, ifp->addr.s6_addr+8, 8);
2017 err = 0;
2018 break;
2019 }
2020 }
2021 read_unlock_bh(&idev->lock);
2022 return err;
2023}
2024
1da177e4 2025/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 2026static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2027{
1da177e4 2028regen:
955189ef 2029 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2030 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2031
2032 /*
2033 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2034 * check if generated address is not inappropriate
2035 *
2036 * - Reserved subnet anycast (RFC 2526)
2037 * 11111101 11....11 1xxxxxxx
c7dc89c0 2038 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2039 * 00-00-5E-FE-xx-xx-xx-xx
2040 * - value 0
2041 * - XXX: already assigned to an address on the device
2042 */
1ab1457c 2043 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2044 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2045 (idev->rndid[7]&0x80))
2046 goto regen;
2047 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2048 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2049 goto regen;
2050 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2051 goto regen;
2052 }
1da177e4
LT		 2053}
2054
2055static void ipv6_regen_rndid(unsigned long data)
2056{
2057 struct inet6_dev *idev = (struct inet6_dev *) data;
2058 unsigned long expires;
2059
8814c4b5 2060 rcu_read_lock_bh();
1da177e4
LT		 2061 write_lock_bh(&idev->lock);
2062
2063 if (idev->dead)
2064 goto out;
2065
eb7e0575 2066 __ipv6_regen_rndid(idev);
1ab1457c 2067
1da177e4 2068 expires = jiffies +
1ab1457c 2069 idev->cnf.temp_prefered_lft * HZ -
1f9248e5
JP		 2070 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2071 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
784e2710 2072 idev->cnf.max_desync_factor * HZ;
1da177e4 2073 if (time_before(expires, jiffies)) {
f3213831
JP		 2074 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2075 __func__, idev->dev->name);
1da177e4
LT		 2076 goto out;
2077 }
2078
2079 if (!mod_timer(&idev->regen_timer, expires))
2080 in6_dev_hold(idev);
2081
2082out:
2083 write_unlock_bh(&idev->lock);
8814c4b5 2084 rcu_read_unlock_bh();
1da177e4
LT		 2085 in6_dev_put(idev);
2086}
2087
eb7e0575 2088static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2089{
1da177e4 2090 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 2091 __ipv6_regen_rndid(idev);
1da177e4 2092}
1da177e4
LT		 2093
2094/*
2095 * Add prefix route.
2096 */
2097
2098static void
2099addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2100 unsigned long expires, u32 flags)
1da177e4 2101{
86872cb5
TG		 2102 struct fib6_config cfg = {
2103 .fc_table = RT6_TABLE_PREFIX,
2104 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2105 .fc_ifindex = dev->ifindex,
2106 .fc_expires = expires,
2107 .fc_dst_len = plen,
2108 .fc_flags = RTF_UP | flags,
c346dca1 2109 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2110 .fc_protocol = RTPROT_KERNEL,
86872cb5 2111 };
1da177e4 2112
4e3fd7a0 2113 cfg.fc_dst = *pfx;
1da177e4
LT		 2114
2115 /* Prevent useless cloning on PtP SIT.
2116 This thing is done here expecting that the whole
2117 class of non-broadcast devices need not cloning.
2118 */
07a93626 2119#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2120 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2121 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2122#endif
1da177e4 2123
86872cb5 2124 ip6_route_add(&cfg);
1da177e4
LT		 2125}
2126
14ef37b6
AH		 2127
2128static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2129 int plen,
2130 const struct net_device *dev,
2131 u32 flags, u32 noflags)
2132{
2133 struct fib6_node *fn;
2134 struct rt6_info *rt = NULL;
2135 struct fib6_table *table;
2136
2137 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
63159f29 2138 if (!table)
14ef37b6
AH		 2139 return NULL;
2140
5744dd9b 2141 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2142 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2143 if (!fn)
2144 goto out;
1f56a01f
MKL		 2145
2146 noflags |= RTF_CACHE;
14ef37b6 2147 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2148 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2149 continue;
2150 if ((rt->rt6i_flags & flags) != flags)
2151 continue;
85da53bf 2152 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2153 continue;
2154 dst_hold(&rt->dst);
2155 break;
2156 }
2157out:
5744dd9b 2158 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2159 return rt;
2160}
2161
2162
1da177e4
LT		 2163/* Create "default" multicast route to the interface */
2164
2165static void addrconf_add_mroute(struct net_device *dev)
2166{
86872cb5
TG		 2167 struct fib6_config cfg = {
2168 .fc_table = RT6_TABLE_LOCAL,
2169 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2170 .fc_ifindex = dev->ifindex,
2171 .fc_dst_len = 8,
2172 .fc_flags = RTF_UP,
c346dca1 2173 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2174 };
2175
2176 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2177
2178 ip6_route_add(&cfg);
1da177e4
LT		 2179}
2180
1da177e4
LT		 2181static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2182{
2183 struct inet6_dev *idev;
2184
2185 ASSERT_RTNL();
2186
e21e8467
SH		 2187 idev = ipv6_find_idev(dev);
2188 if (!idev)
64e724f6
BH		 2189 return ERR_PTR(-ENOBUFS);
2190
2191 if (idev->cnf.disable_ipv6)
2192 return ERR_PTR(-EACCES);
1da177e4
LT		 2193
2194 /* Add default multicast route */
4af04aba
LW		 2195 if (!(dev->flags & IFF_LOOPBACK))
2196 addrconf_add_mroute(dev);
1da177e4 2197
1da177e4
LT		 2198 return idev;
2199}
2200
53bd6749
JP		 2201static void manage_tempaddrs(struct inet6_dev *idev,
2202 struct inet6_ifaddr *ifp,
2203 __u32 valid_lft, __u32 prefered_lft,
2204 bool create, unsigned long now)
2205{
2206 u32 flags;
2207 struct inet6_ifaddr *ift;
2208
2209 read_lock_bh(&idev->lock);
2210 /* update all temporary addresses in the list */
2211 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2212 int age, max_valid, max_prefered;
2213
2214 if (ifp != ift->ifpub)
2215 continue;
2216
2217 /* RFC 4941 section 3.3:
2218 * If a received option will extend the lifetime of a public
2219 * address, the lifetimes of temporary addresses should
2220 * be extended, subject to the overall constraint that no
2221 * temporary addresses should ever remain "valid" or "preferred"
2222 * for a time longer than (TEMP_VALID_LIFETIME) or
2223 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2224 */
2225 age = (now - ift->cstamp) / HZ;
2226 max_valid = idev->cnf.temp_valid_lft - age;
2227 if (max_valid < 0)
2228 max_valid = 0;
2229
2230 max_prefered = idev->cnf.temp_prefered_lft -
2231 idev->cnf.max_desync_factor - age;
2232 if (max_prefered < 0)
2233 max_prefered = 0;
2234
2235 if (valid_lft > max_valid)
2236 valid_lft = max_valid;
2237
2238 if (prefered_lft > max_prefered)
2239 prefered_lft = max_prefered;
2240
2241 spin_lock(&ift->lock);
2242 flags = ift->flags;
2243 ift->valid_lft = valid_lft;
2244 ift->prefered_lft = prefered_lft;
2245 ift->tstamp = now;
2246 if (prefered_lft > 0)
2247 ift->flags &= ~IFA_F_DEPRECATED;
2248
2249 spin_unlock(&ift->lock);
2250 if (!(flags&IFA_F_TENTATIVE))
2251 ipv6_ifa_notify(0, ift);
2252 }
2253
2254 if ((create || list_empty(&idev->tempaddr_list)) &&
2255 idev->cnf.use_tempaddr > 0) {
2256 /* When a new public address is created as described
2257 * in [ADDRCONF], also create a new temporary address.
2258 * Also create a temporary address if it's enabled but
2259 * no temporary address currently exists.
2260 */
2261 read_unlock_bh(&idev->lock);
2262 ipv6_create_tempaddr(ifp, NULL);
2263 } else {
2264 read_unlock_bh(&idev->lock);
2265 }
2266}
2267
e6bff995 2268void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2269{
2270 struct prefix_info *pinfo;
2271 __u32 valid_lft;
2272 __u32 prefered_lft;
2273 int addr_type;
64236f3f 2274 u32 addr_flags = 0;
1da177e4 2275 struct inet6_dev *in6_dev;
56d417b1 2276 struct net *net = dev_net(dev);
1da177e4
LT		 2277
2278 pinfo = (struct prefix_info *) opt;
1ab1457c 2279
1da177e4 2280 if (len < sizeof(struct prefix_info)) {
ba3542e1 2281 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2282 return;
2283 }
1ab1457c 2284
1da177e4
LT		 2285 /*
2286 * Validation checks ([ADDRCONF], page 19)
2287 */
2288
2289 addr_type = ipv6_addr_type(&pinfo->prefix);
2290
2291 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2292 return;
2293
2294 valid_lft = ntohl(pinfo->valid);
2295 prefered_lft = ntohl(pinfo->prefered);
2296
2297 if (prefered_lft > valid_lft) {
e87cc472 2298 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2299 return;
2300 }
2301
2302 in6_dev = in6_dev_get(dev);
2303
63159f29 2304 if (!in6_dev) {
e87cc472
JP		 2305 net_dbg_ratelimited("addrconf: device %s not configured\n",
2306 dev->name);
1da177e4
LT		 2307 return;
2308 }
2309
2310 /*
2311 * Two things going on here:
2312 * 1) Add routes for on-link prefixes
2313 * 2) Configure prefixes with the auto flag set
2314 */
2315
4bed72e4
YH		 2316 if (pinfo->onlink) {
2317 struct rt6_info *rt;
2318 unsigned long rt_expires;
2319
6f704992
YH		 2320 /* Avoid arithmetic overflow. Really, we could
2321 * save rt_expires in seconds, likely valid_lft,
2322 * but it would require division in fib gc, that it
2323 * not good.
2324 */
4bed72e4
YH		 2325 if (HZ > USER_HZ)
2326 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2327 else
2328 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2329
4bed72e4
YH		 2330 if (addrconf_finite_timeout(rt_expires))
2331 rt_expires *= HZ;
1da177e4 2332
14ef37b6
AH		 2333 rt = addrconf_get_prefix_route(&pinfo->prefix,
2334 pinfo->prefix_len,
2335 dev,
2336 RTF_ADDRCONF | RTF_PREFIX_RT,
2337 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2338
14ef37b6 2339 if (rt) {
6f704992
YH		 2340 /* Autoconf prefix route */
2341 if (valid_lft == 0) {
2342 ip6_del_rt(rt);
2343 rt = NULL;
4bed72e4 2344 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2345 /* not infinity */
1716a961 2346 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2347 } else {
1716a961 2348 rt6_clean_expires(rt);
1da177e4
LT		 2349 }
2350 } else if (valid_lft) {
6f704992 2351 clock_t expires = 0;
4bed72e4
YH		 2352 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2353 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2354 /* not infinity */
2355 flags |= RTF_EXPIRES;
2356 expires = jiffies_to_clock_t(rt_expires);
2357 }
1da177e4 2358 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2359 dev, expires, flags);
1da177e4 2360 }
94e187c0 2361 ip6_rt_put(rt);
1da177e4
LT		 2362 }
2363
2364 /* Try to figure out our local address for this prefix */
2365
2366 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 2367 struct inet6_ifaddr *ifp;
1da177e4
LT		 2368 struct in6_addr addr;
2369 int create = 0, update_lft = 0;
617fe29d 2370 bool tokenized = false;
1da177e4
LT		 2371
2372 if (pinfo->prefix_len == 64) {
2373 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2374
2375 if (!ipv6_addr_any(&in6_dev->token)) {
2376 read_lock_bh(&in6_dev->lock);
2377 memcpy(addr.s6_addr + 8,
2378 in6_dev->token.s6_addr + 8, 8);
2379 read_unlock_bh(&in6_dev->lock);
617fe29d 2380 tokenized = true;
622c81d5
HFS		 2381 } else if (in6_dev->addr_gen_mode ==
2382 IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
2383 !ipv6_generate_stable_address(&addr, 0,
2384 in6_dev)) {
64236f3f 2385 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2386 goto ok;
f53adae4
DB		 2387 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2388 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1da177e4
LT		 2389 in6_dev_put(in6_dev);
2390 return;
2391 }
2392 goto ok;
2393 }
e87cc472
JP		 2394 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2395 pinfo->prefix_len);
1da177e4
LT		 2396 in6_dev_put(in6_dev);
2397 return;
2398
2399ok:
2400
53b7997f 2401 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4 2402
63159f29 2403 if (!ifp && valid_lft) {
1da177e4 2404 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 2405
2406#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2407 if (in6_dev->cnf.optimistic_dad &&
e6bff995 2408 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 2409 addr_flags = IFA_F_OPTIMISTIC;
2410#endif
1da177e4
LT		 2411
2412 /* Do not allow to create too much of autoconfigured
2413 * addresses; this would be too easy way to crash kernel.
2414 */
2415 if (!max_addresses ||
2416 ipv6_count_addresses(in6_dev) < max_addresses)
3f8f5298
JP		 2417 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2418 pinfo->prefix_len,
95c385b4 2419 addr_type&IPV6_ADDR_SCOPE_MASK,
8a226b2c
JB		 2420 addr_flags, valid_lft,
2421 prefered_lft);
1da177e4 2422
3f0d2ba0 2423 if (IS_ERR_OR_NULL(ifp)) {
1da177e4
LT		 2424 in6_dev_put(in6_dev);
2425 return;
2426 }
2427
8a226b2c
JB		 2428 update_lft = 0;
2429 create = 1;
c15b1cca
HFS		 2430 spin_lock_bh(&ifp->lock);
2431 ifp->flags |= IFA_F_MANAGETEMPADDR;
1da177e4 2432 ifp->cstamp = jiffies;
617fe29d 2433 ifp->tokenized = tokenized;
c15b1cca 2434 spin_unlock_bh(&ifp->lock);
cf22f9a2 2435 addrconf_dad_start(ifp);
1da177e4
LT		 2436 }
2437
2438 if (ifp) {
479840ff 2439 u32 flags;
1da177e4 2440 unsigned long now;
1da177e4
LT		 2441 u32 stored_lft;
2442
2443 /* update lifetime (RFC2462 5.5.3 e) */
8e8e676d 2444 spin_lock_bh(&ifp->lock);
1da177e4
LT		 2445 now = jiffies;
2446 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2447 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2448 else
2449 stored_lft = 0;
8a226b2c 2450 if (!update_lft && !create && stored_lft) {
9451a304
FF		 2451 const u32 minimum_lft = min_t(u32,
2452 stored_lft, MIN_VALID_LIFETIME);
c9d55d5b
PM		 2453 valid_lft = max(valid_lft, minimum_lft);
2454
2455 /* RFC4862 Section 5.5.3e:
2456 * "Note that the preferred lifetime of the
2457 * corresponding address is always reset to
2458 * the Preferred Lifetime in the received
2459 * Prefix Information option, regardless of
2460 * whether the valid lifetime is also reset or
2461 * ignored."
2462 *
2463 * So we should always update prefered_lft here.
2464 */
2465 update_lft = 1;
1da177e4
LT		 2466 }
2467
2468 if (update_lft) {
2469 ifp->valid_lft = valid_lft;
2470 ifp->prefered_lft = prefered_lft;
2471 ifp->tstamp = now;
2472 flags = ifp->flags;
2473 ifp->flags &= ~IFA_F_DEPRECATED;
8e8e676d 2474 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2475
2476 if (!(flags&IFA_F_TENTATIVE))
2477 ipv6_ifa_notify(0, ifp);
2478 } else
8e8e676d 2479 spin_unlock_bh(&ifp->lock);
1da177e4 2480
53bd6749
JP		 2481 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2482 create, now);
5d9efa7e 2483
1da177e4 2484 in6_ifa_put(ifp);
c15b1cca 2485 addrconf_verify();
1da177e4
LT		 2486 }
2487 }
2488 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2489 in6_dev_put(in6_dev);
2490}
2491
2492/*
2493 * Set destination address.
2494 * Special case for SIT interfaces where we create a new "virtual"
2495 * device.
2496 */
af284937 2497int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2498{
2499 struct in6_ifreq ireq;
2500 struct net_device *dev;
2501 int err = -EINVAL;
2502
2503 rtnl_lock();
2504
2505 err = -EFAULT;
2506 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2507 goto err_exit;
2508
af284937 2509 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2510
2511 err = -ENODEV;
63159f29 2512 if (!dev)
1da177e4
LT		 2513 goto err_exit;
2514
07a93626 2515#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2516 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2517 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2518 struct ifreq ifr;
1da177e4
LT		 2519 struct ip_tunnel_parm p;
2520
2521 err = -EADDRNOTAVAIL;
2522 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2523 goto err_exit;
2524
2525 memset(&p, 0, sizeof(p));
2526 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2527 p.iph.saddr = 0;
2528 p.iph.version = 4;
2529 p.iph.ihl = 5;
2530 p.iph.protocol = IPPROTO_IPV6;
2531 p.iph.ttl = 64;
d20b3109 2532 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2533
5bc3eb7e
SH		 2534 if (ops->ndo_do_ioctl) {
2535 mm_segment_t oldfs = get_fs();
2536
2537 set_fs(KERNEL_DS);
2538 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2539 set_fs(oldfs);
2540 } else
2541 err = -EOPNOTSUPP;
1da177e4
LT		 2542
2543 if (err == 0) {
2544 err = -ENOBUFS;
af284937
DL		 2545 dev = __dev_get_by_name(net, p.name);
2546 if (!dev)
1da177e4
LT		 2547 goto err_exit;
2548 err = dev_open(dev);
2549 }
2550 }
0be669bb 2551#endif
1da177e4
LT		 2552
2553err_exit:
2554 rtnl_unlock();
2555 return err;
2556}
2557
93a714d6
MC		 2558static int ipv6_mc_config(struct sock *sk, bool join,
2559 const struct in6_addr *addr, int ifindex)
2560{
2561 int ret;
2562
2563 ASSERT_RTNL();
2564
2565 lock_sock(sk);
2566 if (join)
54ff9ef3 2567 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2568 else
54ff9ef3 2569 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2570 release_sock(sk);
2571
2572 return ret;
2573}
2574
1da177e4
LT		 2575/*
2576 * Manual configuration of address on an interface
2577 */
479840ff
JP		 2578static int inet6_addr_add(struct net *net, int ifindex,
2579 const struct in6_addr *pfx,
caeaba79 2580 const struct in6_addr *peer_pfx,
479840ff
JP		 2581 unsigned int plen, __u32 ifa_flags,
2582 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2583{
2584 struct inet6_ifaddr *ifp;
2585 struct inet6_dev *idev;
2586 struct net_device *dev;
93a714d6
MC		 2587 unsigned long timeout;
2588 clock_t expires;
1da177e4 2589 int scope;
6f704992 2590 u32 flags;
1da177e4
LT		 2591
2592 ASSERT_RTNL();
1ab1457c 2593
24ef0da7
TG		 2594 if (plen > 128)
2595 return -EINVAL;
2596
0778769d
NT		 2597 /* check the lifetime */
2598 if (!valid_lft || prefered_lft > valid_lft)
2599 return -EINVAL;
2600
53bd6749
JP		 2601 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2602 return -EINVAL;
2603
af284937
DL		 2604 dev = __dev_get_by_index(net, ifindex);
2605 if (!dev)
1da177e4 2606 return -ENODEV;
1ab1457c 2607
64e724f6
BH		 2608 idev = addrconf_add_dev(dev);
2609 if (IS_ERR(idev))
2610 return PTR_ERR(idev);
1da177e4 2611
93a714d6
MC		 2612 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2613 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2614 true, pfx, ifindex);
2615
2616 if (ret < 0)
2617 return ret;
2618 }
2619
1da177e4
LT		 2620 scope = ipv6_addr_scope(pfx);
2621
4bed72e4
YH		 2622 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2623 if (addrconf_finite_timeout(timeout)) {
2624 expires = jiffies_to_clock_t(timeout * HZ);
2625 valid_lft = timeout;
6f704992 2626 flags = RTF_EXPIRES;
4bed72e4
YH		 2627 } else {
2628 expires = 0;
2629 flags = 0;
2630 ifa_flags |= IFA_F_PERMANENT;
6f704992 2631 }
0778769d 2632
4bed72e4
YH		 2633 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2634 if (addrconf_finite_timeout(timeout)) {
2635 if (timeout == 0)
2636 ifa_flags |= IFA_F_DEPRECATED;
2637 prefered_lft = timeout;
2638 }
0778769d 2639
8a226b2c
JB		 2640 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2641 valid_lft, prefered_lft);
0778769d 2642
1da177e4 2643 if (!IS_ERR(ifp)) {
761aac73
TH		 2644 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2645 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2646 expires, flags);
2647 }
2648
95c385b4
NH		 2649 /*
2650 * Note that section 3.1 of RFC 4429 indicates
2651 * that the Optimistic flag should not be set for
2652 * manually configured addresses
2653 */
cf22f9a2 2654 addrconf_dad_start(ifp);
53bd6749
JP		 2655 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2656 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2657 true, jiffies);
1da177e4 2658 in6_ifa_put(ifp);
c15b1cca 2659 addrconf_verify_rtnl();
1da177e4 2660 return 0;
93a714d6
MC		 2661 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2662 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2663 false, pfx, ifindex);
1da177e4
LT		 2664 }
2665
2666 return PTR_ERR(ifp);
2667}
2668
6046d5b4
HK		 2669static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2670 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2671{
2672 struct inet6_ifaddr *ifp;
2673 struct inet6_dev *idev;
2674 struct net_device *dev;
1ab1457c 2675
24ef0da7
TG		 2676 if (plen > 128)
2677 return -EINVAL;
2678
af284937
DL		 2679 dev = __dev_get_by_index(net, ifindex);
2680 if (!dev)
1da177e4
LT		 2681 return -ENODEV;
2682
e5d08d71 2683 idev = __in6_dev_get(dev);
63159f29 2684 if (!idev)
1da177e4
LT		 2685 return -ENXIO;
2686
2687 read_lock_bh(&idev->lock);
502a2ffd 2688 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2689 if (ifp->prefix_len == plen &&
2690 ipv6_addr_equal(pfx, &ifp->addr)) {
2691 in6_ifa_hold(ifp);
2692 read_unlock_bh(&idev->lock);
1ab1457c 2693
6046d5b4
HK		 2694 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2695 (ifa_flags & IFA_F_MANAGETEMPADDR))
2696 manage_tempaddrs(idev, ifp, 0, 0, false,
2697 jiffies);
1da177e4 2698 ipv6_del_addr(ifp);
6046d5b4 2699 addrconf_verify_rtnl();
93a714d6
MC		 2700 if (ipv6_addr_is_multicast(pfx)) {
2701 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2702 false, pfx, dev->ifindex);
2703 }
1da177e4
LT		 2704 return 0;
2705 }
2706 }
2707 read_unlock_bh(&idev->lock);
2708 return -EADDRNOTAVAIL;
2709}
2710
2711
af284937 2712int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2713{
2714 struct in6_ifreq ireq;
2715 int err;
1ab1457c 2716
af31f412 2717 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2718 return -EPERM;
1ab1457c 2719
1da177e4
LT		 2720 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2721 return -EFAULT;
2722
2723 rtnl_lock();
caeaba79 2724 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2725 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2726 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2727 rtnl_unlock();
2728 return err;
2729}
2730
af284937 2731int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2732{
2733 struct in6_ifreq ireq;
2734 int err;
1ab1457c 2735
af31f412 2736 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2737 return -EPERM;
2738
2739 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2740 return -EFAULT;
2741
2742 rtnl_lock();
6046d5b4 2743 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2744 ireq.ifr6_prefixlen);
1da177e4
LT		 2745 rtnl_unlock();
2746 return err;
2747}
2748
b5f348e5
IJ		 2749static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2750 int plen, int scope)
2751{
2752 struct inet6_ifaddr *ifp;
2753
8a226b2c 2754 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2755 scope, IFA_F_PERMANENT,
2756 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2757 if (!IS_ERR(ifp)) {
2758 spin_lock_bh(&ifp->lock);
2759 ifp->flags &= ~IFA_F_TENTATIVE;
2760 spin_unlock_bh(&ifp->lock);
2761 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2762 in6_ifa_put(ifp);
2763 }
2764}
2765
07a93626 2766#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2767static void sit_add_v4_addrs(struct inet6_dev *idev)
2768{
1da177e4
LT		 2769 struct in6_addr addr;
2770 struct net_device *dev;
c346dca1 2771 struct net *net = dev_net(idev->dev);
929c9cf3 2772 int scope, plen;
f0e2acfa 2773 u32 pflags = 0;
1da177e4
LT		 2774
2775 ASSERT_RTNL();
2776
2777 memset(&addr, 0, sizeof(struct in6_addr));
2778 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2779
2780 if (idev->dev->flags&IFF_POINTOPOINT) {
2781 addr.s6_addr32[0] = htonl(0xfe800000);
2782 scope = IFA_LINK;
929c9cf3 2783 plen = 64;
1da177e4
LT		 2784 } else {
2785 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2786 plen = 96;
f0e2acfa 2787 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2788 }
2789
2790 if (addr.s6_addr32[3]) {
929c9cf3 2791 add_addr(idev, &addr, plen, scope);
f0e2acfa 2792 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2793 return;
2794 }
2795
6fda7350 2796 for_each_netdev(net, dev) {
8e5e8f30 2797 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2798 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2799 struct in_ifaddr *ifa;
1da177e4
LT		 2800
2801 int flag = scope;
2802
2803 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2804
2805 addr.s6_addr32[3] = ifa->ifa_local;
2806
2807 if (ifa->ifa_scope == RT_SCOPE_LINK)
2808 continue;
2809 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2810 if (idev->dev->flags&IFF_POINTOPOINT)
2811 continue;
2812 flag |= IFA_HOST;
2813 }
1da177e4 2814
b5f348e5 2815 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2816 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2817 pflags);
1da177e4
LT		 2818 }
2819 }
1ab1457c 2820 }
1da177e4 2821}
0be669bb 2822#endif
1da177e4
LT		 2823
2824static void init_loopback(struct net_device *dev)
2825{
2826 struct inet6_dev *idev;
25fb6ca4
BK		 2827 struct net_device *sp_dev;
2828 struct inet6_ifaddr *sp_ifa;
2829 struct rt6_info *sp_rt;
1da177e4
LT		 2830
2831 /* ::1 */
2832
2833 ASSERT_RTNL();
2834
e5d08d71 2835 idev = ipv6_find_idev(dev);
63159f29 2836 if (!idev) {
91df42be 2837 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2838 return;
2839 }
2840
b5f348e5 2841 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2842
2843 /* Add routes to other interface's IPv6 addresses */
2844 for_each_netdev(dev_net(dev), sp_dev) {
2845 if (!strcmp(sp_dev->name, dev->name))
2846 continue;
2847
2848 idev = __in6_dev_get(sp_dev);
2849 if (!idev)
2850 continue;
2851
2852 read_lock_bh(&idev->lock);
2853 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2854
2855 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2856 continue;
2857
33d99113
G		 2858 if (sp_ifa->rt) {
2859 /* This dst has been added to garbage list when
2860 * lo device down, release this obsolete dst and
2861 * reallocate a new router for ifa.
2862 */
2863 if (sp_ifa->rt->dst.obsolete > 0) {
2864 ip6_rt_put(sp_ifa->rt);
2865 sp_ifa->rt = NULL;
2866 } else {
2867 continue;
2868 }
2869 }
a881ae1f 2870
57ec0afe 2871 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 2872
2873 /* Failure cases are ignored */
534c8779
G		 2874 if (!IS_ERR(sp_rt)) {
2875 sp_ifa->rt = sp_rt;
25fb6ca4 2876 ip6_ins_rt(sp_rt);
534c8779 2877 }
25fb6ca4
BK		 2878 }
2879 read_unlock_bh(&idev->lock);
2880 }
1da177e4
LT		 2881}
2882
64236f3f
HFS		 2883static void addrconf_add_linklocal(struct inet6_dev *idev,
2884 const struct in6_addr *addr, u32 flags)
1da177e4 2885{
8e5e8f30 2886 struct inet6_ifaddr *ifp;
64236f3f 2887 u32 addr_flags = flags | IFA_F_PERMANENT;
95c385b4
NH		 2888
2889#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2890 if (idev->cnf.optimistic_dad &&
702beb87 2891 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2892 addr_flags |= IFA_F_OPTIMISTIC;
2893#endif
1da177e4 2894
07edd741
HFS		 2895 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2896 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 2897 if (!IS_ERR(ifp)) {
46d48046 2898 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2899 addrconf_dad_start(ifp);
1da177e4
LT		 2900 in6_ifa_put(ifp);
2901 }
2902}
2903
622c81d5
HFS		 2904static bool ipv6_reserved_interfaceid(struct in6_addr address)
2905{
2906 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2907 return true;
2908
2909 if (address.s6_addr32[2] == htonl(0x02005eff) &&
2910 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2911 return true;
2912
2913 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2914 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2915 return true;
2916
2917 return false;
2918}
2919
2920static int ipv6_generate_stable_address(struct in6_addr *address,
2921 u8 dad_count,
2922 const struct inet6_dev *idev)
2923{
622c81d5
HFS		 2924 static DEFINE_SPINLOCK(lock);
2925 static __u32 digest[SHA_DIGEST_WORDS];
2926 static __u32 workspace[SHA_WORKSPACE_WORDS];
2927
2928 static union {
2929 char __data[SHA_MESSAGE_BYTES];
2930 struct {
2931 struct in6_addr secret;
ff40217e 2932 __be32 prefix[2];
622c81d5
HFS		 2933 unsigned char hwaddr[MAX_ADDR_LEN];
2934 u8 dad_count;
2935 } __packed;
2936 } data;
2937
2938 struct in6_addr secret;
2939 struct in6_addr temp;
2940 struct net *net = dev_net(idev->dev);
2941
2942 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
2943
2944 if (idev->cnf.stable_secret.initialized)
2945 secret = idev->cnf.stable_secret.secret;
2946 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
2947 secret = net->ipv6.devconf_dflt->stable_secret.secret;
2948 else
2949 return -1;
2950
2951retry:
2952 spin_lock_bh(&lock);
2953
2954 sha_init(digest);
2955 memset(&data, 0, sizeof(data));
2956 memset(workspace, 0, sizeof(workspace));
2957 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 2958 data.prefix[0] = address->s6_addr32[0];
2959 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 2960 data.secret = secret;
2961 data.dad_count = dad_count;
2962
2963 sha_transform(digest, data.__data, workspace);
2964
2965 temp = *address;
ff40217e
HFS		 2966 temp.s6_addr32[2] = (__force __be32)digest[0];
2967 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 2968
2969 spin_unlock_bh(&lock);
2970
2971 if (ipv6_reserved_interfaceid(temp)) {
2972 dad_count++;
1855b7c3 2973 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 2974 return -1;
2975 goto retry;
2976 }
2977
2978 *address = temp;
2979 return 0;
2980}
2981
bc91b0f0
JP		 2982static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
2983{
622c81d5
HFS		 2984 struct in6_addr addr;
2985
2986 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 2987
622c81d5
HFS		 2988 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
2989 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 2990 addrconf_add_linklocal(idev, &addr,
2991 IFA_F_STABLE_PRIVACY);
622c81d5
HFS		 2992 else if (prefix_route)
2993 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
2994 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
bc91b0f0
JP		 2995 /* addrconf_add_linklocal also adds a prefix_route and we
2996 * only need to care about prefix routes if ipv6_generate_eui64
2997 * couldn't generate one.
2998 */
2999 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3000 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0
JP		 3001 else if (prefix_route)
3002 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3003 }
3004}
3005
1da177e4
LT		 3006static void addrconf_dev_config(struct net_device *dev)
3007{
8e5e8f30 3008 struct inet6_dev *idev;
1da177e4
LT		 3009
3010 ASSERT_RTNL();
3011
74235a25
HX		 3012 if ((dev->type != ARPHRD_ETHER) &&
3013 (dev->type != ARPHRD_FDDI) &&
74235a25 3014 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3015 (dev->type != ARPHRD_INFINIBAND) &&
cb6bf355 3016 (dev->type != ARPHRD_IEEE802154) &&
e837735e 3017 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8
JR		 3018 (dev->type != ARPHRD_TUNNEL6) &&
3019 (dev->type != ARPHRD_6LOWPAN)) {
74235a25
HX		 3020 /* Alas, we support only Ethernet autoconfiguration. */
3021 return;
3022 }
3023
1da177e4 3024 idev = addrconf_add_dev(dev);
64e724f6 3025 if (IS_ERR(idev))
1da177e4
LT		 3026 return;
3027
bc91b0f0 3028 addrconf_addr_gen(idev, false);
1da177e4
LT		 3029}
3030
07a93626 3031#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3032static void addrconf_sit_config(struct net_device *dev)
3033{
3034 struct inet6_dev *idev;
3035
3036 ASSERT_RTNL();
3037
1ab1457c
YH		 3038 /*
3039 * Configure the tunnel with one of our IPv4
3040 * addresses... we should configure all of
1da177e4
LT		 3041 * our v4 addrs in the tunnel
3042 */
3043
e5d08d71 3044 idev = ipv6_find_idev(dev);
63159f29 3045 if (!idev) {
91df42be 3046 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3047 return;
3048 }
3049
c7dc89c0 3050 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3051 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3052 return;
3053 }
3054
1da177e4
LT		 3055 sit_add_v4_addrs(idev);
3056
62b54dd9 3057 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3058 addrconf_add_mroute(dev);
1da177e4 3059}
0be669bb 3060#endif
1da177e4 3061
07a93626 3062#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3063static void addrconf_gre_config(struct net_device *dev)
3064{
3065 struct inet6_dev *idev;
aee80b54 3066
aee80b54 3067 ASSERT_RTNL();
3068
e5d08d71 3069 idev = ipv6_find_idev(dev);
63159f29 3070 if (!idev) {
91df42be 3071 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3072 return;
3073 }
3074
bc91b0f0 3075 addrconf_addr_gen(idev, true);
aee80b54 3076}
3077#endif
3078
1ab1457c 3079static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3080 void *ptr)
1da177e4 3081{
351638e7 3082 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 3083 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 3084 int run_pending = 0;
b217d616 3085 int err;
1da177e4 3086
e21e8467 3087 switch (event) {
45ba9dd2 3088 case NETDEV_REGISTER:
74235a25 3089 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3090 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3091 if (IS_ERR(idev))
3092 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3093 }
3094 break;
bcdd553f 3095
1da177e4 3096 case NETDEV_UP:
3c21edbd 3097 case NETDEV_CHANGE:
c2edacf8
JV		 3098 if (dev->flags & IFF_SLAVE)
3099 break;
3100
3ce62a84
WC		 3101 if (idev && idev->cnf.disable_ipv6)
3102 break;
3103
3c21edbd 3104 if (event == NETDEV_UP) {
f24e3d65 3105 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 3106 /* device is not ready yet. */
f3213831 3107 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3108 dev->name);
3109 break;
3110 }
99081049 3111
d31c7b8f
EP		 3112 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3113 idev = ipv6_add_dev(dev);
3114
a317a2f1 3115 if (!IS_ERR_OR_NULL(idev)) {
99081049 3116 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3117 run_pending = 1;
3118 }
3c21edbd 3119 } else {
f24e3d65 3120 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 3121 /* device is still not ready. */
3122 break;
3123 }
3124
3125 if (idev) {
bcdd553f 3126 if (idev->if_flags & IF_READY)
3c21edbd
YH		 3127 /* device is already configured. */
3128 break;
3c21edbd
YH		 3129 idev->if_flags |= IF_READY;
3130 }
3131
f3213831
JP		 3132 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3133 dev->name);
3c21edbd 3134
c5e33bdd 3135 run_pending = 1;
3c21edbd
YH		 3136 }
3137
e21e8467 3138 switch (dev->type) {
07a93626 3139#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3140 case ARPHRD_SIT:
3141 addrconf_sit_config(dev);
3142 break;
aee80b54 3143#endif
07a93626 3144#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3145 case ARPHRD_IPGRE:
3146 addrconf_gre_config(dev);
3147 break;
0be669bb 3148#endif
1da177e4
LT		 3149 case ARPHRD_LOOPBACK:
3150 init_loopback(dev);
3151 break;
3152
3153 default:
3154 addrconf_dev_config(dev);
3155 break;
3ff50b79 3156 }
bcdd553f 3157
a317a2f1 3158 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3159 if (run_pending)
3160 addrconf_dad_run(idev);
3161
bcdd553f
SH		 3162 /*
3163 * If the MTU changed during the interface down,
3164 * when the interface up, the changed MTU must be
3165 * reflected in the idev as well as routers.
1da177e4 3166 */
bcdd553f
SH		 3167 if (idev->cnf.mtu6 != dev->mtu &&
3168 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3169 rt6_mtu_change(dev, dev->mtu);
3170 idev->cnf.mtu6 = dev->mtu;
3171 }
3172 idev->tstamp = jiffies;
3173 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3174
3175 /*
3176 * If the changed mtu during down is lower than
3177 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3178 */
3179 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 3180 addrconf_ifdown(dev, 1);
1da177e4
LT		 3181 }
3182 break;
3183
3184 case NETDEV_CHANGEMTU:
d31c7b8f 3185 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3186 rt6_mtu_change(dev, dev->mtu);
3187 idev->cnf.mtu6 = dev->mtu;
3188 break;
3189 }
3190
d31c7b8f
EP		 3191 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3192 idev = ipv6_add_dev(dev);
a317a2f1 3193 if (!IS_ERR(idev))
d31c7b8f
EP		 3194 break;
3195 }
3196
bcdd553f 3197 /*
db9c7c39 3198 * if MTU under IPV6_MIN_MTU.
bcdd553f
SH		 3199 * Stop IPv6 on this interface.
3200 */
1da177e4
LT		 3201
3202 case NETDEV_DOWN:
3203 case NETDEV_UNREGISTER:
3204 /*
3205 * Remove all addresses from this interface.
3206 */
3207 addrconf_ifdown(dev, event != NETDEV_DOWN);
3208 break;
3c21edbd 3209
1da177e4 3210 case NETDEV_CHANGENAME:
1da177e4 3211 if (idev) {
5632c515 3212 snmp6_unregister_dev(idev);
408c4768 3213 addrconf_sysctl_unregister(idev);
a317a2f1 3214 err = addrconf_sysctl_register(idev);
b217d616
HX		 3215 if (err)
3216 return notifier_from_errno(err);
a317a2f1
WC		 3217 err = snmp6_register_dev(idev);
3218 if (err) {
3219 addrconf_sysctl_unregister(idev);
3220 return notifier_from_errno(err);
3221 }
5632c515 3222 }
1da177e4 3223 break;
bcdd553f 3224
93d9b7d7
JP		 3225 case NETDEV_PRE_TYPE_CHANGE:
3226 case NETDEV_POST_TYPE_CHANGE:
3227 addrconf_type_change(dev, event);
75c78500 3228 break;
3ff50b79 3229 }
1da177e4
LT		 3230
3231 return NOTIFY_OK;
3232}
3233
3234/*
3235 * addrconf module should be notified of a device going up
3236 */
3237static struct notifier_block ipv6_dev_notf = {
3238 .notifier_call = addrconf_notify,
1da177e4
LT		 3239};
3240
93d9b7d7 3241static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3242{
3243 struct inet6_dev *idev;
3244 ASSERT_RTNL();
3245
3246 idev = __in6_dev_get(dev);
3247
93d9b7d7 3248 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3249 ipv6_mc_remap(idev);
93d9b7d7 3250 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3251 ipv6_mc_unmap(idev);
3252}
3253
1da177e4
LT		 3254static int addrconf_ifdown(struct net_device *dev, int how)
3255{
c346dca1 3256 struct net *net = dev_net(dev);
502a2ffd 3257 struct inet6_dev *idev;
3258 struct inet6_ifaddr *ifa;
73a8bd74 3259 int state, i;
1da177e4
LT		 3260
3261 ASSERT_RTNL();
3262
73a8bd74
DM		 3263 rt6_ifdown(net, dev);
3264 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3265
3266 idev = __in6_dev_get(dev);
63159f29 3267 if (!idev)
1da177e4
LT		 3268 return -ENODEV;
3269
bcdd553f
SH		 3270 /*
3271 * Step 1: remove reference to ipv6 device from parent device.
3272 * Do not dev_put!
1da177e4 3273 */
439e2385 3274 if (how) {
1da177e4 3275 idev->dead = 1;
8814c4b5
YH		 3276
3277 /* protected by rtnl_lock */
a9b3cd7f 3278 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3279
3280 /* Step 1.5: remove snmp6 entry */
3281 snmp6_unregister_dev(idev);
3282
3283 }
3284
73a8bd74
DM		 3285 /* Step 2: clear hash table */
3286 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3287 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3288
3289 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3290restart:
b67bfe0d 3291 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74
DM		 3292 if (ifa->idev == idev) {
3293 hlist_del_init_rcu(&ifa->addr_lst);
c15b1cca 3294 addrconf_del_dad_work(ifa);
73a8bd74
DM		 3295 goto restart;
3296 }
3297 }
3298 spin_unlock_bh(&addrconf_hash_lock);
3299 }
3300
1da177e4
LT		 3301 write_lock_bh(&idev->lock);
3302
b7b1bfce
HFS		 3303 addrconf_del_rs_timer(idev);
3304
bcdd553f 3305 /* Step 2: clear flags for stateless addrconf */
439e2385 3306 if (!how)
3c21edbd 3307 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3308
439e2385 3309 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 3310 in6_dev_put(idev);
3311
bcdd553f 3312 /* Step 3: clear tempaddr list */
372e6c8f 3313 while (!list_empty(&idev->tempaddr_list)) {
3314 ifa = list_first_entry(&idev->tempaddr_list,
3315 struct inet6_ifaddr, tmp_list);
3316 list_del(&ifa->tmp_list);
1da177e4
LT		 3317 write_unlock_bh(&idev->lock);
3318 spin_lock_bh(&ifa->lock);
3319
3320 if (ifa->ifpub) {
3321 in6_ifa_put(ifa->ifpub);
3322 ifa->ifpub = NULL;
3323 }
3324 spin_unlock_bh(&ifa->lock);
3325 in6_ifa_put(ifa);
3326 write_lock_bh(&idev->lock);
3327 }
8f37ada5 3328
502a2ffd 3329 while (!list_empty(&idev->addr_list)) {
3330 ifa = list_first_entry(&idev->addr_list,
3331 struct inet6_ifaddr, if_list);
c15b1cca 3332 addrconf_del_dad_work(ifa);
84e8b803 3333
73a8bd74 3334 list_del(&ifa->if_list);
84e8b803 3335
73a8bd74 3336 write_unlock_bh(&idev->lock);
84e8b803 3337
8e8e676d 3338 spin_lock_bh(&ifa->lock);
73a8bd74
DM		 3339 state = ifa->state;
3340 ifa->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 3341 spin_unlock_bh(&ifa->lock);
9d82ca98 3342
73a8bd74
DM		 3343 if (state != INET6_IFADDR_STATE_DEAD) {
3344 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3345 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
27bdb2ab 3346 }
73a8bd74 3347 in6_ifa_put(ifa);
8f37ada5 3348
73a8bd74
DM		 3349 write_lock_bh(&idev->lock);
3350 }
8f37ada5 3351
1da177e4
LT		 3352 write_unlock_bh(&idev->lock);
3353
381f4dca
SD		 3354 /* Step 5: Discard anycast and multicast list */
3355 if (how) {
3356 ipv6_ac_destroy_dev(idev);
1da177e4 3357 ipv6_mc_destroy_dev(idev);
381f4dca 3358 } else {
1da177e4 3359 ipv6_mc_down(idev);
381f4dca 3360 }
1da177e4 3361
1da177e4 3362 idev->tstamp = jiffies;
1ab1457c 3363
bcdd553f 3364 /* Last: Shot the device (if unregistered) */
439e2385 3365 if (how) {
408c4768 3366 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3367 neigh_parms_release(&nd_tbl, idev->nd_parms);
3368 neigh_ifdown(&nd_tbl, dev);
3369 in6_dev_put(idev);
3370 }
3371 return 0;
3372}
3373
3374static void addrconf_rs_timer(unsigned long data)
3375{
b7b1bfce 3376 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3377 struct net_device *dev = idev->dev;
b7b1bfce 3378 struct in6_addr lladdr;
1da177e4 3379
b7b1bfce 3380 write_lock(&idev->lock);
5b2a1953 3381 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3382 goto out;
3383
9ba2add3 3384 if (!ipv6_accept_ra(idev))
5b2a1953 3385 goto out;
3386
3387 /* Announcement received after solicitation was sent */
3388 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3389 goto out;
1da177e4 3390
b7b1bfce 3391 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
caf92bc4
CW		 3392 write_unlock(&idev->lock);
3393 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3394 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3395 &in6addr_linklocal_allrouters);
3396 else
caf92bc4 3397 goto put;
1da177e4 3398
caf92bc4 3399 write_lock(&idev->lock);
b7b1bfce
HFS		 3400 /* The wait after the last probe can be shorter */
3401 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3402 idev->cnf.rtr_solicits) ?
3403 idev->cnf.rtr_solicit_delay :
3404 idev->cnf.rtr_solicit_interval);
1da177e4 3405 } else {
1da177e4
LT		 3406 /*
3407 * Note: we do not support deprecated "all on-link"
3408 * assumption any longer.
3409 */
91df42be 3410 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3411 }
3412
3413out:
b7b1bfce 3414 write_unlock(&idev->lock);
caf92bc4 3415put:
b7b1bfce 3416 in6_dev_put(idev);
1da177e4
LT		 3417}
3418
3419/*
3420 * Duplicate Address Detection
3421 */
3c21edbd
YH		 3422static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3423{
3424 unsigned long rand_num;
3425 struct inet6_dev *idev = ifp->idev;
3426
95c385b4
NH		 3427 if (ifp->flags & IFA_F_OPTIMISTIC)
3428 rand_num = 0;
3429 else
63862b5b 3430 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3431
b7b1bfce 3432 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3433 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3434}
3435
c15b1cca 3436static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3437{
3438 struct inet6_dev *idev = ifp->idev;
3439 struct net_device *dev = idev->dev;
1da177e4
LT		 3440
3441 addrconf_join_solict(dev, &ifp->addr);
3442
63862b5b 3443 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3444
3445 read_lock_bh(&idev->lock);
622ccdf1 3446 spin_lock(&ifp->lock);
e9d3e084 3447 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3448 goto out;
1da177e4
LT		 3449
3450 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3451 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3452 !(ifp->flags&IFA_F_TENTATIVE) ||
3453 ifp->flags & IFA_F_NODAD) {
cc411d0b 3454 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3455 spin_unlock(&ifp->lock);
1da177e4
LT		 3456 read_unlock_bh(&idev->lock);
3457
3458 addrconf_dad_completed(ifp);
3459 return;
3460 }
3461
6732bade 3462 if (!(idev->if_flags & IF_READY)) {
21809faf 3463 spin_unlock(&ifp->lock);
6732bade 3464 read_unlock_bh(&idev->lock);
3c21edbd 3465 /*
590a9887 3466 * If the device is not ready:
3c21edbd
YH		 3467 * - keep it tentative if it is a permanent address.
3468 * - otherwise, kill it.
3469 */
3470 in6_ifa_hold(ifp);
cc411d0b 3471 addrconf_dad_stop(ifp, 0);
6732bade 3472 return;
3c21edbd 3473 }
95c385b4
NH		 3474
3475 /*
3476 * Optimistic nodes can start receiving
3477 * Frames right away
3478 */
7fd2561e 3479 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3480 ip6_ins_rt(ifp->rt);
7fd2561e
EK		 3481 if (ipv6_use_optimistic_addr(idev)) {
3482 /* Because optimistic nodes can use this address,
3483 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3484 */
3485 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3486 }
3487 }
95c385b4 3488
6732bade 3489 addrconf_dad_kick(ifp);
1da177e4 3490out:
622ccdf1 3491 spin_unlock(&ifp->lock);
1da177e4
LT		 3492 read_unlock_bh(&idev->lock);
3493}
3494
c15b1cca 3495static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3496{
c15b1cca
HFS		 3497 bool begin_dad = false;
3498
8e8e676d 3499 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3500 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3501 ifp->state = INET6_IFADDR_STATE_PREDAD;
3502 begin_dad = true;
3503 }
8e8e676d 3504 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3505
3506 if (begin_dad)
3507 addrconf_mod_dad_work(ifp, 0);
3508}
3509
3510static void addrconf_dad_work(struct work_struct *w)
3511{
3512 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3513 struct inet6_ifaddr,
3514 dad_work);
1da177e4 3515 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 3516 struct in6_addr mcaddr;
3517
c15b1cca
HFS		 3518 enum {
3519 DAD_PROCESS,
3520 DAD_BEGIN,
3521 DAD_ABORT,
3522 } action = DAD_PROCESS;
3523
3524 rtnl_lock();
3525
8e8e676d 3526 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3527 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3528 action = DAD_BEGIN;
3529 ifp->state = INET6_IFADDR_STATE_DAD;
3530 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3531 action = DAD_ABORT;
3532 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3533 }
8e8e676d 3534 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3535
3536 if (action == DAD_BEGIN) {
3537 addrconf_dad_begin(ifp);
3538 goto out;
3539 } else if (action == DAD_ABORT) {
3540 addrconf_dad_stop(ifp, 1);
3541 goto out;
3542 }
3543
b7b1bfce 3544 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3545 goto out;
3546
c15b1cca 3547 write_lock_bh(&idev->lock);
122e4519 3548 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3549 write_unlock_bh(&idev->lock);
1da177e4
LT		 3550 goto out;
3551 }
21809faf 3552
3553 spin_lock(&ifp->lock);
622ccdf1
HX		 3554 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3555 spin_unlock(&ifp->lock);
c15b1cca 3556 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3557 goto out;
3558 }
3559
b7b1bfce 3560 if (ifp->dad_probes == 0) {
1da177e4
LT		 3561 /*
3562 * DAD was successful
3563 */
3564
cc411d0b 3565 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3566 spin_unlock(&ifp->lock);
c15b1cca 3567 write_unlock_bh(&idev->lock);
1da177e4
LT		 3568
3569 addrconf_dad_completed(ifp);
3570
3571 goto out;
3572 }
3573
b7b1bfce 3574 ifp->dad_probes--;
c15b1cca
HFS		 3575 addrconf_mod_dad_work(ifp,
3576 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3577 spin_unlock(&ifp->lock);
c15b1cca 3578 write_unlock_bh(&idev->lock);
1da177e4
LT		 3579
3580 /* send a neighbour solicitation for our addr */
1da177e4 3581 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3582 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3583out:
3584 in6_ifa_put(ifp);
c15b1cca 3585 rtnl_unlock();
1da177e4
LT		 3586}
3587
11ffff75
HFS		 3588/* ifp->idev must be at least read locked */
3589static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3590{
3591 struct inet6_ifaddr *ifpiter;
3592 struct inet6_dev *idev = ifp->idev;
3593
602582ca
HFS		 3594 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3595 if (ifpiter->scope > IFA_LINK)
3596 break;
11ffff75
HFS		 3597 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3598 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3599 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3600 IFA_F_PERMANENT)
3601 return false;
3602 }
3603 return true;
3604}
3605
1da177e4
LT		 3606static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3607{
e21e8467 3608 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3609 struct in6_addr lladdr;
b173ee48 3610 bool send_rs, send_mld;
b7b1bfce 3611
c15b1cca 3612 addrconf_del_dad_work(ifp);
1da177e4
LT		 3613
3614 /*
3615 * Configure the address for reception. Now it is valid.
3616 */
3617
3618 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3619
026359bc
TA		 3620 /* If added prefix is link local and we are prepared to process
3621 router advertisements, start sending router solicitations.
1da177e4
LT		 3622 */
3623
1ec047eb 3624 read_lock_bh(&ifp->idev->lock);
11ffff75 3625 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 3626 send_rs = send_mld &&
3627 ipv6_accept_ra(ifp->idev) &&
1ec047eb 3628 ifp->idev->cnf.rtr_solicits > 0 &&
b173ee48 3629 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 3630 read_unlock_bh(&ifp->idev->lock);
3631
b173ee48
HFS		 3632 /* While dad is in progress mld report's source address is in6_addrany.
3633 * Resend with proper ll now.
3634 */
3635 if (send_mld)
3636 ipv6_mc_dad_complete(ifp->idev);
3637
1ec047eb 3638 if (send_rs) {
1da177e4
LT		 3639 /*
3640 * If a host as already performed a random delay
3641 * [...] as part of DAD [...] there is no need
3642 * to delay again before sending the first RS
3643 */
1ec047eb 3644 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 3645 return;
1ec047eb 3646 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 3647
b7b1bfce
HFS		 3648 write_lock_bh(&ifp->idev->lock);
3649 spin_lock(&ifp->lock);
3650 ifp->idev->rs_probes = 1;
1da177e4 3651 ifp->idev->if_flags |= IF_RS_SENT;
b7b1bfce
HFS		 3652 addrconf_mod_rs_timer(ifp->idev,
3653 ifp->idev->cnf.rtr_solicit_interval);
3654 spin_unlock(&ifp->lock);
3655 write_unlock_bh(&ifp->idev->lock);
1da177e4
LT		 3656 }
3657}
3658
e21e8467
SH		 3659static void addrconf_dad_run(struct inet6_dev *idev)
3660{
c5e33bdd
YH		 3661 struct inet6_ifaddr *ifp;
3662
3663 read_lock_bh(&idev->lock);
502a2ffd 3664 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3665 spin_lock(&ifp->lock);
f2344a13
HX		 3666 if (ifp->flags & IFA_F_TENTATIVE &&
3667 ifp->state == INET6_IFADDR_STATE_DAD)
3668 addrconf_dad_kick(ifp);
21809faf 3669 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3670 }
3671 read_unlock_bh(&idev->lock);
3672}
3673
1da177e4
LT		 3674#ifdef CONFIG_PROC_FS
3675struct if6_iter_state {
3c40090a 3676 struct seq_net_private p;
1da177e4 3677 int bucket;
1d578303 3678 int offset;
1da177e4
LT		 3679};
3680
1d578303 3681static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3682{
3683 struct inet6_ifaddr *ifa = NULL;
3684 struct if6_iter_state *state = seq->private;
1218854a 3685 struct net *net = seq_file_net(seq);
1d578303 3686 int p = 0;
1da177e4 3687
1d578303
MM		 3688 /* initial bucket if pos is 0 */
3689 if (pos == 0) {
3690 state->bucket = 0;
3691 state->offset = 0;
3692 }
3693
3694 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 3695 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 3696 addr_lst) {
9f0d3c27
ED		 3697 if (!net_eq(dev_net(ifa->idev->dev), net))
3698 continue;
1d578303
MM		 3699 /* sync with offset */
3700 if (p < state->offset) {
3701 p++;
3702 continue;
3703 }
3704 state->offset++;
9f0d3c27 3705 return ifa;
1d578303
MM		 3706 }
3707
3708 /* prepare for next bucket */
3709 state->offset = 0;
3710 p = 0;
1da177e4 3711 }
c2e21293 3712 return NULL;
1da177e4
LT		 3713}
3714
c2e21293 3715static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3716 struct inet6_ifaddr *ifa)
1da177e4
LT		 3717{
3718 struct if6_iter_state *state = seq->private;
1218854a 3719 struct net *net = seq_file_net(seq);
1da177e4 3720
b67bfe0d 3721 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 3722 if (!net_eq(dev_net(ifa->idev->dev), net))
3723 continue;
1d578303 3724 state->offset++;
9f0d3c27 3725 return ifa;
1d578303 3726 }
3c40090a 3727
c2e21293 3728 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3729 state->offset = 0;
b67bfe0d 3730 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 3731 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 3732 if (!net_eq(dev_net(ifa->idev->dev), net))
3733 continue;
1d578303 3734 state->offset++;
9f0d3c27 3735 return ifa;
c2e21293 3736 }
1da177e4 3737 }
3c40090a 3738
c2e21293 3739 return NULL;
1da177e4
LT		 3740}
3741
1da177e4 3742static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3743 __acquires(rcu_bh)
1da177e4 3744{
5c578aed 3745 rcu_read_lock_bh();
1d578303 3746 return if6_get_first(seq, *pos);
1da177e4
LT		 3747}
3748
3749static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3750{
3751 struct inet6_ifaddr *ifa;
3752
3753 ifa = if6_get_next(seq, v);
3754 ++*pos;
3755 return ifa;
3756}
3757
3758static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3759 __releases(rcu_bh)
1da177e4 3760{
5c578aed 3761 rcu_read_unlock_bh();
1da177e4
LT		 3762}
3763
3764static int if6_seq_show(struct seq_file *seq, void *v)
3765{
3766 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 3767 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3768 &ifp->addr,
1da177e4
LT		 3769 ifp->idev->dev->ifindex,
3770 ifp->prefix_len,
3771 ifp->scope,
971a351c 3772 (u8) ifp->flags,
1da177e4
LT		 3773 ifp->idev->dev->name);
3774 return 0;
3775}
3776
56b3d975 3777static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3778 .start = if6_seq_start,
3779 .next = if6_seq_next,
3780 .show = if6_seq_show,
3781 .stop = if6_seq_stop,
3782};
3783
3784static int if6_seq_open(struct inode *inode, struct file *file)
3785{
3c40090a
DL		 3786 return seq_open_net(inode, file, &if6_seq_ops,
3787 sizeof(struct if6_iter_state));
1da177e4
LT		 3788}
3789
9a32144e 3790static const struct file_operations if6_fops = {
1da177e4
LT		 3791 .owner = THIS_MODULE,
3792 .open = if6_seq_open,
3793 .read = seq_read,
3794 .llseek = seq_lseek,
3c40090a 3795 .release = seq_release_net,
1da177e4
LT		 3796};
3797
2c8c1e72 3798static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3799{
d4beaa66 3800 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 3801 return -ENOMEM;
3802 return 0;
3803}
3804
2c8c1e72 3805static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 3806{
ece31ffd 3807 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 3808}
3809
3810static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 3811 .init = if6_proc_net_init,
3812 .exit = if6_proc_net_exit,
3c40090a
DL		 3813};
3814
3815int __init if6_proc_init(void)
3816{
3817 return register_pernet_subsys(&if6_proc_net_ops);
3818}
3819
1da177e4
LT		 3820void if6_proc_exit(void)
3821{
3c40090a 3822 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3823}
3824#endif /* CONFIG_PROC_FS */
3825
07a93626 3826#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 3827/* Check if address is a home address configured on any interface. */
b71d1d42 3828int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3829{
3830 int ret = 0;
c2e21293 3831 struct inet6_ifaddr *ifp = NULL;
ddbe5032 3832 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3833
5c578aed 3834 rcu_read_lock_bh();
b67bfe0d 3835 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 3836 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3837 continue;
caad295f 3838 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3839 (ifp->flags & IFA_F_HOMEADDRESS)) {
3840 ret = 1;
3841 break;
3842 }
3843 }
5c578aed 3844 rcu_read_unlock_bh();
3b9f9a1c
NT		 3845 return ret;
3846}
3847#endif
3848
1da177e4
LT		 3849/*
3850 * Periodic address status verification
3851 */
3852
c15b1cca 3853static void addrconf_verify_rtnl(void)
1da177e4 3854{
b2db7564 3855 unsigned long now, next, next_sec, next_sched;
1da177e4 3856 struct inet6_ifaddr *ifp;
1da177e4
LT		 3857 int i;
3858
c15b1cca
HFS		 3859 ASSERT_RTNL();
3860
5c578aed 3861 rcu_read_lock_bh();
1da177e4 3862 now = jiffies;
b2db7564 3863 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 3864
c15b1cca 3865 cancel_delayed_work(&addr_chk_work);
1da177e4 3866
bcdd553f 3867 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3868restart:
c15b1cca 3869 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 3870 unsigned long age;
1da177e4 3871
fad8da3e
YA		 3872 /* When setting preferred_lft to a value not zero or
3873 * infinity, while valid_lft is infinity
3874 * IFA_F_PERMANENT has a non-infinity life time.
3875 */
3876 if ((ifp->flags & IFA_F_PERMANENT) &&
3877 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 3878 continue;
3879
3880 spin_lock(&ifp->lock);
b2db7564
YH		 3881 /* We try to batch several events at once. */
3882 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3883
8f27ebb9
YH		 3884 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3885 age >= ifp->valid_lft) {
1da177e4
LT		 3886 spin_unlock(&ifp->lock);
3887 in6_ifa_hold(ifp);
1da177e4
LT		 3888 ipv6_del_addr(ifp);
3889 goto restart;
8f27ebb9
YH		 3890 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3891 spin_unlock(&ifp->lock);
3892 continue;
1da177e4 3893 } else if (age >= ifp->prefered_lft) {
a1ed0526 3894 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3895 int deprecate = 0;
3896
3897 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3898 deprecate = 1;
3899 ifp->flags |= IFA_F_DEPRECATED;
3900 }
3901
fad8da3e
YA		 3902 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3903 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 3904 next = ifp->tstamp + ifp->valid_lft * HZ;
3905
3906 spin_unlock(&ifp->lock);
3907
3908 if (deprecate) {
3909 in6_ifa_hold(ifp);
1da177e4
LT		 3910
3911 ipv6_ifa_notify(0, ifp);
3912 in6_ifa_put(ifp);
3913 goto restart;
3914 }
1da177e4
LT		 3915 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3916 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3917 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3918 ifp->idev->cnf.dad_transmits *
1f9248e5 3919 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 3920
1da177e4
LT		 3921 if (age >= ifp->prefered_lft - regen_advance) {
3922 struct inet6_ifaddr *ifpub = ifp->ifpub;
3923 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3924 next = ifp->tstamp + ifp->prefered_lft * HZ;
3925 if (!ifp->regen_count && ifpub) {
3926 ifp->regen_count++;
3927 in6_ifa_hold(ifp);
3928 in6_ifa_hold(ifpub);
3929 spin_unlock(&ifp->lock);
5c578aed 3930
291d809b
HY		 3931 spin_lock(&ifpub->lock);
3932 ifpub->regen_count = 0;
3933 spin_unlock(&ifpub->lock);
1da177e4
LT		 3934 ipv6_create_tempaddr(ifpub, ifp);
3935 in6_ifa_put(ifpub);
3936 in6_ifa_put(ifp);
3937 goto restart;
3938 }
3939 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3940 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3941 spin_unlock(&ifp->lock);
1da177e4
LT		 3942 } else {
3943 /* ifp->prefered_lft <= ifp->valid_lft */
3944 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3945 next = ifp->tstamp + ifp->prefered_lft * HZ;
3946 spin_unlock(&ifp->lock);
3947 }
3948 }
1da177e4
LT		 3949 }
3950
b2db7564
YH		 3951 next_sec = round_jiffies_up(next);
3952 next_sched = next;
3953
3954 /* If rounded timeout is accurate enough, accept it. */
3955 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3956 next_sched = next_sec;
3957
3958 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3959 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3960 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3961
ba3542e1 3962 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3963 now, next, next_sec, next_sched);
c15b1cca 3964 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 3965 rcu_read_unlock_bh();
1da177e4
LT		 3966}
3967
c15b1cca
HFS		 3968static void addrconf_verify_work(struct work_struct *w)
3969{
3970 rtnl_lock();
3971 addrconf_verify_rtnl();
3972 rtnl_unlock();
3973}
3974
3975static void addrconf_verify(void)
3976{
3977 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
3978}
3979
caeaba79
ND		 3980static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3981 struct in6_addr **peer_pfx)
461d8837
TG		 3982{
3983 struct in6_addr *pfx = NULL;
3984
caeaba79
ND		 3985 *peer_pfx = NULL;
3986
461d8837
TG		 3987 if (addr)
3988 pfx = nla_data(addr);
3989
3990 if (local) {
3991 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 3992 *peer_pfx = pfx;
3993 pfx = nla_data(local);
461d8837
TG		 3994 }
3995
3996 return pfx;
3997}
3998
ef7c79ed 3999static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4000 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4001 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4002 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4003 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 4004};
4005
1da177e4 4006static int
661d2967 4007inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4008{
3b1e0a65 4009 struct net *net = sock_net(skb->sk);
b933f716
TG		 4010 struct ifaddrmsg *ifm;
4011 struct nlattr *tb[IFA_MAX+1];
caeaba79 4012 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4013 u32 ifa_flags;
b933f716 4014 int err;
1da177e4 4015
b933f716
TG		 4016 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4017 if (err < 0)
4018 return err;
4019
4020 ifm = nlmsg_data(nlh);
caeaba79 4021 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4022 if (!pfx)
1da177e4
LT		 4023 return -EINVAL;
4024
6046d5b4
HK		 4025 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4026
4027 /* We ignore other flags so far. */
4028 ifa_flags &= IFA_F_MANAGETEMPADDR;
4029
4030 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4031 ifm->ifa_prefixlen);
1da177e4
LT		 4032}
4033
479840ff 4034static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 4035 u32 prefered_lft, u32 valid_lft)
081bba5b 4036{
6f704992
YH		 4037 u32 flags;
4038 clock_t expires;
4bed72e4 4039 unsigned long timeout;
53bd6749 4040 bool was_managetempaddr;
5b84efec 4041 bool had_prefixroute;
46d48046 4042
c15b1cca
HFS		 4043 ASSERT_RTNL();
4044
081bba5b
NT		 4045 if (!valid_lft || (prefered_lft > valid_lft))
4046 return -EINVAL;
4047
53bd6749
JP		 4048 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4049 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4050 return -EINVAL;
4051
4bed72e4
YH		 4052 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4053 if (addrconf_finite_timeout(timeout)) {
4054 expires = jiffies_to_clock_t(timeout * HZ);
4055 valid_lft = timeout;
6f704992 4056 flags = RTF_EXPIRES;
4bed72e4
YH		 4057 } else {
4058 expires = 0;
4059 flags = 0;
4060 ifa_flags |= IFA_F_PERMANENT;
6f704992 4061 }
081bba5b 4062
4bed72e4
YH		 4063 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4064 if (addrconf_finite_timeout(timeout)) {
4065 if (timeout == 0)
4066 ifa_flags |= IFA_F_DEPRECATED;
4067 prefered_lft = timeout;
4068 }
081bba5b
NT		 4069
4070 spin_lock_bh(&ifp->lock);
53bd6749 4071 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4072 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4073 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4074 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4075 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4076 IFA_F_NOPREFIXROUTE);
53bd6749 4077 ifp->flags |= ifa_flags;
081bba5b
NT		 4078 ifp->tstamp = jiffies;
4079 ifp->valid_lft = valid_lft;
4080 ifp->prefered_lft = prefered_lft;
4081
4082 spin_unlock_bh(&ifp->lock);
4083 if (!(ifp->flags&IFA_F_TENTATIVE))
4084 ipv6_ifa_notify(0, ifp);
081bba5b 4085
761aac73
TH		 4086 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4087 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4088 expires, flags);
5b84efec
TH		 4089 } else if (had_prefixroute) {
4090 enum cleanup_prefix_rt_t action;
4091 unsigned long rt_expires;
4092
4093 write_lock_bh(&ifp->idev->lock);
4094 action = check_cleanup_prefix_route(ifp, &rt_expires);
4095 write_unlock_bh(&ifp->idev->lock);
4096
4097 if (action != CLEANUP_PREFIX_RT_NOP) {
4098 cleanup_prefix_route(ifp, rt_expires,
4099 action == CLEANUP_PREFIX_RT_DEL);
4100 }
761aac73 4101 }
53bd6749
JP		 4102
4103 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4104 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4105 valid_lft = prefered_lft = 0;
4106 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4107 !was_managetempaddr, jiffies);
4108 }
4109
c15b1cca 4110 addrconf_verify_rtnl();
081bba5b
NT		 4111
4112 return 0;
4113}
4114
1da177e4 4115static int
661d2967 4116inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4117{
3b1e0a65 4118 struct net *net = sock_net(skb->sk);
461d8837
TG		 4119 struct ifaddrmsg *ifm;
4120 struct nlattr *tb[IFA_MAX+1];
caeaba79 4121 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 4122 struct inet6_ifaddr *ifa;
4123 struct net_device *dev;
55ebaef1 4124 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 4125 u32 ifa_flags;
461d8837 4126 int err;
1da177e4 4127
461d8837
TG		 4128 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4129 if (err < 0)
4130 return err;
4131
4132 ifm = nlmsg_data(nlh);
caeaba79 4133 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4134 if (!pfx)
1da177e4
LT		 4135 return -EINVAL;
4136
461d8837 4137 if (tb[IFA_CACHEINFO]) {
0778769d 4138 struct ifa_cacheinfo *ci;
461d8837
TG		 4139
4140 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 4141 valid_lft = ci->ifa_valid;
461d8837
TG		 4142 preferred_lft = ci->ifa_prefered;
4143 } else {
4144 preferred_lft = INFINITY_LIFE_TIME;
4145 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 4146 }
4147
af284937 4148 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4149 if (!dev)
7198f8ce
TG		 4150 return -ENODEV;
4151
479840ff
JP		 4152 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4153
55ebaef1 4154 /* We ignore other flags so far. */
761aac73 4155 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
93a714d6 4156 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
55ebaef1 4157
1cab3da6 4158 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
63159f29 4159 if (!ifa) {
7198f8ce
TG		 4160 /*
4161 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4162 * userspace already relies on not having to provide this.
7198f8ce 4163 */
caeaba79 4164 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 4165 ifm->ifa_prefixlen, ifa_flags,
4166 preferred_lft, valid_lft);
081bba5b
NT		 4167 }
4168
7198f8ce
TG		 4169 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4170 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4171 err = -EEXIST;
4172 else
55ebaef1 4173 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 4174
4175 in6_ifa_put(ifa);
4176
4177 return err;
1da177e4
LT		 4178}
4179
479840ff 4180static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4181 u8 scope, int ifindex)
4182{
4183 struct ifaddrmsg *ifm;
4184
4185 ifm = nlmsg_data(nlh);
4186 ifm->ifa_family = AF_INET6;
4187 ifm->ifa_prefixlen = prefixlen;
4188 ifm->ifa_flags = flags;
4189 ifm->ifa_scope = scope;
4190 ifm->ifa_index = ifindex;
4191}
4192
85486af0
TG		 4193static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4194 unsigned long tstamp, u32 preferred, u32 valid)
4195{
4196 struct ifa_cacheinfo ci;
4197
18a31e1e
TG		 4198 ci.cstamp = cstamp_delta(cstamp);
4199 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4200 ci.ifa_prefered = preferred;
4201 ci.ifa_valid = valid;
4202
4203 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4204}
4205
101bb229
TG		 4206static inline int rt_scope(int ifa_scope)
4207{
4208 if (ifa_scope & IFA_HOST)
4209 return RT_SCOPE_HOST;
4210 else if (ifa_scope & IFA_LINK)
4211 return RT_SCOPE_LINK;
4212 else if (ifa_scope & IFA_SITE)
4213 return RT_SCOPE_SITE;
4214 else
4215 return RT_SCOPE_UNIVERSE;
4216}
4217
0ab6803b
TG		 4218static inline int inet6_ifaddr_msgsize(void)
4219{
339bf98f 4220 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4221 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4222 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4223 + nla_total_size(sizeof(struct ifa_cacheinfo))
4224 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4225}
c5396a31 4226
1da177e4 4227static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4228 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4229{
1da177e4 4230 struct nlmsghdr *nlh;
85486af0 4231 u32 preferred, valid;
1da177e4 4232
15e47304 4233 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4234 if (!nlh)
26932566 4235 return -EMSGSIZE;
0ab6803b 4236
101bb229
TG		 4237 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4238 ifa->idev->dev->ifindex);
4239
fad8da3e
YA		 4240 if (!((ifa->flags&IFA_F_PERMANENT) &&
4241 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4242 preferred = ifa->prefered_lft;
4243 valid = ifa->valid_lft;
4244 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4245 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4246 if (preferred > tval)
4247 preferred -= tval;
4248 else
4249 preferred = 0;
f56619fc
BH		 4250 if (valid != INFINITY_LIFE_TIME) {
4251 if (valid > tval)
4252 valid -= tval;
4253 else
4254 valid = 0;
4255 }
1da177e4
LT		 4256 }
4257 } else {
85486af0
TG		 4258 preferred = INFINITY_LIFE_TIME;
4259 valid = INFINITY_LIFE_TIME;
4260 }
4261
7996c799 4262 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4263 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4264 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4265 goto error;
4266 } else
930345ea 4267 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4268 goto error;
4269
4270 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4271 goto error;
1da177e4 4272
479840ff
JP		 4273 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4274 goto error;
4275
053c095a
JB		 4276 nlmsg_end(skb, nlh);
4277 return 0;
caeaba79
ND		 4278
4279error:
4280 nlmsg_cancel(skb, nlh);
4281 return -EMSGSIZE;
1da177e4
LT		 4282}
4283
4284static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4285 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4286{
1da177e4 4287 struct nlmsghdr *nlh;
101bb229
TG		 4288 u8 scope = RT_SCOPE_UNIVERSE;
4289 int ifindex = ifmca->idev->dev->ifindex;
4290
4291 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4292 scope = RT_SCOPE_SITE;
1da177e4 4293
15e47304 4294 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4295 if (!nlh)
26932566 4296 return -EMSGSIZE;
85486af0 4297
0ab6803b 4298 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4299 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4300 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4301 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4302 nlmsg_cancel(skb, nlh);
4303 return -EMSGSIZE;
4304 }
85486af0 4305
053c095a
JB		 4306 nlmsg_end(skb, nlh);
4307 return 0;
1da177e4
LT		 4308}
4309
4310static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4311 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4312{
1da177e4 4313 struct nlmsghdr *nlh;
101bb229
TG		 4314 u8 scope = RT_SCOPE_UNIVERSE;
4315 int ifindex = ifaca->aca_idev->dev->ifindex;
4316
4317 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4318 scope = RT_SCOPE_SITE;
1da177e4 4319
15e47304 4320 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4321 if (!nlh)
26932566 4322 return -EMSGSIZE;
85486af0 4323
0ab6803b 4324 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4325 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4326 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4327 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4328 nlmsg_cancel(skb, nlh);
4329 return -EMSGSIZE;
4330 }
1da177e4 4331
053c095a
JB		 4332 nlmsg_end(skb, nlh);
4333 return 0;
1da177e4
LT		 4334}
4335
e21e8467 4336enum addr_type_t {
1da177e4
LT		 4337 UNICAST_ADDR,
4338 MULTICAST_ADDR,
4339 ANYCAST_ADDR,
4340};
4341
234b27c3
ED		 4342/* called with rcu_read_lock() */
4343static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4344 struct netlink_callback *cb, enum addr_type_t type,
4345 int s_ip_idx, int *p_ip_idx)
4346{
234b27c3
ED		 4347 struct ifmcaddr6 *ifmca;
4348 struct ifacaddr6 *ifaca;
4349 int err = 1;
4350 int ip_idx = *p_ip_idx;
4351
4352 read_lock_bh(&idev->lock);
4353 switch (type) {
502a2ffd 4354 case UNICAST_ADDR: {
4355 struct inet6_ifaddr *ifa;
4356
234b27c3 4357 /* unicast address incl. temp addr */
502a2ffd 4358 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4359 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4360 continue;
4361 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4362 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4363 cb->nlh->nlmsg_seq,
4364 RTM_NEWADDR,
4365 NLM_F_MULTI);
053c095a 4366 if (err < 0)
234b27c3 4367 break;
63998ac2 4368 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4369 }
4370 break;
502a2ffd 4371 }
234b27c3
ED		 4372 case MULTICAST_ADDR:
4373 /* multicast address */
4374 for (ifmca = idev->mc_list; ifmca;
4375 ifmca = ifmca->next, ip_idx++) {
4376 if (ip_idx < s_ip_idx)
4377 continue;
4378 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4379 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4380 cb->nlh->nlmsg_seq,
4381 RTM_GETMULTICAST,
4382 NLM_F_MULTI);
053c095a 4383 if (err < 0)
234b27c3
ED		 4384 break;
4385 }
4386 break;
4387 case ANYCAST_ADDR:
4388 /* anycast address */
4389 for (ifaca = idev->ac_list; ifaca;
4390 ifaca = ifaca->aca_next, ip_idx++) {
4391 if (ip_idx < s_ip_idx)
4392 continue;
4393 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4394 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4395 cb->nlh->nlmsg_seq,
4396 RTM_GETANYCAST,
4397 NLM_F_MULTI);
053c095a 4398 if (err < 0)
234b27c3
ED		 4399 break;
4400 }
4401 break;
4402 default:
4403 break;
4404 }
4405 read_unlock_bh(&idev->lock);
4406 *p_ip_idx = ip_idx;
4407 return err;
4408}
4409
1da177e4
LT		 4410static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4411 enum addr_type_t type)
4412{
234b27c3
ED		 4413 struct net *net = sock_net(skb->sk);
4414 int h, s_h;
1da177e4
LT		 4415 int idx, ip_idx;
4416 int s_idx, s_ip_idx;
1da177e4 4417 struct net_device *dev;
234b27c3
ED		 4418 struct inet6_dev *idev;
4419 struct hlist_head *head;
1ab1457c 4420
234b27c3
ED		 4421 s_h = cb->args[0];
4422 s_idx = idx = cb->args[1];
4423 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4424
234b27c3 4425 rcu_read_lock();
63998ac2 4426 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4427 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4428 idx = 0;
4429 head = &net->dev_index_head[h];
b67bfe0d 4430 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4431 if (idx < s_idx)
4432 goto cont;
4b97efdf 4433 if (h > s_h || idx > s_idx)
234b27c3
ED		 4434 s_ip_idx = 0;
4435 ip_idx = 0;
e21e8467
SH		 4436 idev = __in6_dev_get(dev);
4437 if (!idev)
234b27c3
ED		 4438 goto cont;
4439
4440 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4441 s_ip_idx, &ip_idx) < 0)
234b27c3 4442 goto done;
7562f876 4443cont:
234b27c3
ED		 4444 idx++;
4445 }
1da177e4 4446 }
234b27c3
ED		 4447done:
4448 rcu_read_unlock();
4449 cb->args[0] = h;
4450 cb->args[1] = idx;
4451 cb->args[2] = ip_idx;
4452
1da177e4
LT		 4453 return skb->len;
4454}
4455
4456static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4457{
4458 enum addr_type_t type = UNICAST_ADDR;
b854272b 4459
1da177e4
LT		 4460 return inet6_dump_addr(skb, cb, type);
4461}
4462
4463static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4464{
4465 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4466
1da177e4
LT		 4467 return inet6_dump_addr(skb, cb, type);
4468}
4469
4470
4471static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4472{
4473 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4474
1da177e4
LT		 4475 return inet6_dump_addr(skb, cb, type);
4476}
4477
661d2967 4478static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4479{
3b1e0a65 4480 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4481 struct ifaddrmsg *ifm;
4482 struct nlattr *tb[IFA_MAX+1];
caeaba79 4483 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4484 struct net_device *dev = NULL;
4485 struct inet6_ifaddr *ifa;
4486 struct sk_buff *skb;
6c223828
NT		 4487 int err;
4488
1b29fc2c
TG		 4489 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4490 if (err < 0)
4491 goto errout;
4492
caeaba79 4493 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
63159f29 4494 if (!addr) {
1b29fc2c
TG		 4495 err = -EINVAL;
4496 goto errout;
6c223828 4497 }
6c223828 4498
1b29fc2c 4499 ifm = nlmsg_data(nlh);
6c223828 4500 if (ifm->ifa_index)
6fda7350 4501 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4502
e21e8467
SH		 4503 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4504 if (!ifa) {
1b29fc2c
TG		 4505 err = -EADDRNOTAVAIL;
4506 goto errout;
4507 }
6c223828 4508
e21e8467
SH		 4509 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4510 if (!skb) {
6c223828 4511 err = -ENOBUFS;
1b29fc2c 4512 goto errout_ifa;
6c223828
NT		 4513 }
4514
15e47304 4515 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4516 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4517 if (err < 0) {
4518 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4519 WARN_ON(err == -EMSGSIZE);
4520 kfree_skb(skb);
4521 goto errout_ifa;
4522 }
15e47304 4523 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4524errout_ifa:
6c223828 4525 in6_ifa_put(ifa);
1b29fc2c 4526errout:
6c223828 4527 return err;
6c223828
NT		 4528}
4529
1da177e4
LT		 4530static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4531{
4532 struct sk_buff *skb;
c346dca1 4533 struct net *net = dev_net(ifa->idev->dev);
5d620266 4534 int err = -ENOBUFS;
1da177e4 4535
0ab6803b 4536 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 4537 if (!skb)
5d620266
TG		 4538 goto errout;
4539
4540 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4541 if (err < 0) {
4542 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4543 WARN_ON(err == -EMSGSIZE);
4544 kfree_skb(skb);
4545 goto errout;
4546 }
1ce85fe4
PNA		 4547 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4548 return;
5d620266
TG		 4549errout:
4550 if (err < 0)
6fda7350 4551 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4552}
4553
b6f99a21 4554static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4555 __s32 *array, int bytes)
4556{
04561c1f
TG		 4557 BUG_ON(bytes < (DEVCONF_MAX * 4));
4558
1da177e4
LT		 4559 memset(array, 0, bytes);
4560 array[DEVCONF_FORWARDING] = cnf->forwarding;
4561 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4562 array[DEVCONF_MTU6] = cnf->mtu6;
4563 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4564 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4565 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4566 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4567 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4568 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4569 jiffies_to_msecs(cnf->rtr_solicit_interval);
4570 array[DEVCONF_RTR_SOLICIT_DELAY] =
4571 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4572 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4573 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4574 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4575 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4576 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4577 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4578 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4579 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4580 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4581 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4582 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4583 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 4584 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4585#ifdef CONFIG_IPV6_ROUTER_PREF
4586 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4587 array[DEVCONF_RTR_PROBE_INTERVAL] =
4588 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4589#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4590 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4591#endif
930d6ff2 4592#endif
fbea49e1 4593 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4594 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4595#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4596 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 4597 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 4598#endif
7bc570c8
YH		 4599#ifdef CONFIG_IPV6_MROUTE
4600 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4601#endif
778d80be 4602 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4603 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4604 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4605 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 4606 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 4607 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 4608 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
3d1bec99 4609 /* we omit DEVCONF_STABLE_SECRET for now */
1da177e4
LT		 4610}
4611
b382b191
TG		 4612static inline size_t inet6_ifla6_size(void)
4613{
4614 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4615 + nla_total_size(sizeof(struct ifla_cacheinfo))
4616 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4617 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4618 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4619 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4620}
4621
339bf98f
TG		 4622static inline size_t inet6_if_nlmsg_size(void)
4623{
4624 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4625 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4626 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4627 + nla_total_size(4) /* IFLA_MTU */
4628 + nla_total_size(4) /* IFLA_LINK */
b382b191 4629 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4630}
c5396a31 4631
be281e55 4632static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 4633 int items, int bytes)
7f7d9a6b
HX		 4634{
4635 int i;
4636 int pad = bytes - sizeof(u64) * items;
4637 BUG_ON(pad < 0);
4638
4639 /* Use put_unaligned() because stats may not be aligned for u64. */
4640 put_unaligned(items, &stats[0]);
4641 for (i = 1; i < items; i++)
be281e55 4642 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 4643
4644 memset(&stats[items], 0, pad);
4645}
4646
698365fa 4647static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4ce3c183
ED		 4648 int items, int bytes, size_t syncpoff)
4649{
4650 int i;
4651 int pad = bytes - sizeof(u64) * items;
4652 BUG_ON(pad < 0);
4653
4654 /* Use put_unaligned() because stats may not be aligned for u64. */
4655 put_unaligned(items, &stats[0]);
4656 for (i = 1; i < items; i++)
4657 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4658
4659 memset(&stats[items], 0, pad);
4660}
4661
7f7d9a6b
HX		 4662static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4663 int bytes)
4664{
e21e8467 4665 switch (attrtype) {
7f7d9a6b 4666 case IFLA_INET6_STATS:
698365fa 4667 __snmp6_fill_stats64(stats, idev->stats.ipv6,
4ce3c183 4668 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 4669 break;
4670 case IFLA_INET6_ICMP6STATS:
be281e55 4671 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 4672 break;
4673 }
4674}
4675
b382b191
TG		 4676static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4677{
4678 struct nlattr *nla;
4679 struct ifla_cacheinfo ci;
4680
c78679e8
DM		 4681 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4682 goto nla_put_failure;
b382b191 4683 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 4684 ci.tstamp = cstamp_delta(idev->tstamp);
4685 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 4686 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 4687 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4688 goto nla_put_failure;
b382b191 4689 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 4690 if (!nla)
b382b191
TG		 4691 goto nla_put_failure;
4692 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4693
4694 /* XXX - MC not implemented */
4695
4696 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 4697 if (!nla)
b382b191
TG		 4698 goto nla_put_failure;
4699 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4700
4701 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 4702 if (!nla)
b382b191
TG		 4703 goto nla_put_failure;
4704 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4705
f53adae4 4706 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 4707 if (!nla)
f53adae4 4708 goto nla_put_failure;
bc91b0f0
JP		 4709
4710 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4711 goto nla_put_failure;
4712
f53adae4
DB		 4713 read_lock_bh(&idev->lock);
4714 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4715 read_unlock_bh(&idev->lock);
4716
b382b191
TG		 4717 return 0;
4718
4719nla_put_failure:
4720 return -EMSGSIZE;
4721}
4722
4723static size_t inet6_get_link_af_size(const struct net_device *dev)
4724{
4725 if (!__in6_dev_get(dev))
4726 return 0;
4727
4728 return inet6_ifla6_size();
4729}
4730
4731static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4732{
4733 struct inet6_dev *idev = __in6_dev_get(dev);
4734
4735 if (!idev)
4736 return -ENODATA;
4737
4738 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4739 return -EMSGSIZE;
4740
4741 return 0;
4742}
4743
f53adae4
DB		 4744static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4745{
f53adae4
DB		 4746 struct inet6_ifaddr *ifp;
4747 struct net_device *dev = idev->dev;
fc403832 4748 bool update_rs = false;
dc848292 4749 struct in6_addr ll_addr;
f53adae4 4750
c15b1cca
HFS		 4751 ASSERT_RTNL();
4752
63159f29 4753 if (!token)
f53adae4
DB		 4754 return -EINVAL;
4755 if (ipv6_addr_any(token))
4756 return -EINVAL;
4757 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4758 return -EINVAL;
f53adae4
DB		 4759 if (!ipv6_accept_ra(idev))
4760 return -EINVAL;
4761 if (idev->cnf.rtr_solicits <= 0)
4762 return -EINVAL;
4763
4764 write_lock_bh(&idev->lock);
4765
4766 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4767 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4768
4769 write_unlock_bh(&idev->lock);
4770
dc848292
HFS		 4771 if (!idev->dead && (idev->if_flags & IF_READY) &&
4772 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4773 IFA_F_OPTIMISTIC)) {
fc403832
DB		 4774
4775 /* If we're not ready, then normal ifup will take care
4776 * of this. Otherwise, we need to request our rs here.
4777 */
4778 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4779 update_rs = true;
4780 }
f53adae4
DB		 4781
4782 write_lock_bh(&idev->lock);
fc403832 4783
77ecaace 4784 if (update_rs) {
fc403832 4785 idev->if_flags |= IF_RS_SENT;
77ecaace
HFS		 4786 idev->rs_probes = 1;
4787 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4788 }
f53adae4
DB		 4789
4790 /* Well, that's kinda nasty ... */
4791 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4792 spin_lock(&ifp->lock);
617fe29d 4793 if (ifp->tokenized) {
f53adae4
DB		 4794 ifp->valid_lft = 0;
4795 ifp->prefered_lft = 0;
4796 }
4797 spin_unlock(&ifp->lock);
4798 }
4799
4800 write_unlock_bh(&idev->lock);
b2ed64a9 4801 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 4802 addrconf_verify_rtnl();
f53adae4
DB		 4803 return 0;
4804}
4805
11b1f828
DB		 4806static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4807 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
4808 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
4809};
4810
4811static int inet6_validate_link_af(const struct net_device *dev,
4812 const struct nlattr *nla)
4813{
4814 struct nlattr *tb[IFLA_INET6_MAX + 1];
4815
4816 if (dev && !__in6_dev_get(dev))
4817 return -EAFNOSUPPORT;
4818
4819 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4820}
4821
f53adae4
DB		 4822static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4823{
4824 int err = -EINVAL;
4825 struct inet6_dev *idev = __in6_dev_get(dev);
4826 struct nlattr *tb[IFLA_INET6_MAX + 1];
4827
4828 if (!idev)
4829 return -EAFNOSUPPORT;
4830
4831 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4832 BUG();
4833
bc91b0f0 4834 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 4835 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 4836 if (err)
4837 return err;
4838 }
4839
4840 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4841 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4842
4843 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
622c81d5
HFS		 4844 mode != IN6_ADDR_GEN_MODE_NONE &&
4845 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
4846 return -EINVAL;
4847
4848 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4849 !idev->cnf.stable_secret.initialized &&
4850 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
bc91b0f0 4851 return -EINVAL;
622c81d5 4852
bc91b0f0
JP		 4853 idev->addr_gen_mode = mode;
4854 err = 0;
4855 }
f53adae4
DB		 4856
4857 return err;
4858}
4859
1ab1457c 4860static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4861 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4862{
04561c1f 4863 struct net_device *dev = idev->dev;
04561c1f
TG		 4864 struct ifinfomsg *hdr;
4865 struct nlmsghdr *nlh;
4866 void *protoinfo;
04561c1f 4867
15e47304 4868 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 4869 if (!nlh)
26932566 4870 return -EMSGSIZE;
04561c1f
TG		 4871
4872 hdr = nlmsg_data(nlh);
4873 hdr->ifi_family = AF_INET6;
4874 hdr->__ifi_pad = 0;
4875 hdr->ifi_type = dev->type;
4876 hdr->ifi_index = dev->ifindex;
4877 hdr->ifi_flags = dev_get_flags(dev);
4878 hdr->ifi_change = 0;
4879
c78679e8
DM		 4880 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4881 (dev->addr_len &&
4882 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4883 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a
ND		 4884 (dev->ifindex != dev_get_iflink(dev) &&
4885 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
c78679e8 4886 goto nla_put_failure;
04561c1f 4887 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 4888 if (!protoinfo)
04561c1f 4889 goto nla_put_failure;
1da177e4 4890
b382b191 4891 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4892 goto nla_put_failure;
1da177e4 4893
04561c1f 4894 nla_nest_end(skb, protoinfo);
053c095a
JB		 4895 nlmsg_end(skb, nlh);
4896 return 0;
1da177e4 4897
04561c1f 4898nla_put_failure:
26932566
PM		 4899 nlmsg_cancel(skb, nlh);
4900 return -EMSGSIZE;
1da177e4
LT		 4901}
4902
4903static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4904{
3b1e0a65 4905 struct net *net = sock_net(skb->sk);
84d2697d 4906 int h, s_h;
434a8a58 4907 int idx = 0, s_idx;
1da177e4
LT		 4908 struct net_device *dev;
4909 struct inet6_dev *idev;
84d2697d 4910 struct hlist_head *head;
1da177e4 4911
84d2697d
ED		 4912 s_h = cb->args[0];
4913 s_idx = cb->args[1];
4914
4915 rcu_read_lock();
4916 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4917 idx = 0;
4918 head = &net->dev_index_head[h];
b67bfe0d 4919 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 4920 if (idx < s_idx)
4921 goto cont;
4922 idev = __in6_dev_get(dev);
4923 if (!idev)
4924 goto cont;
4925 if (inet6_fill_ifinfo(skb, idev,
15e47304 4926 NETLINK_CB(cb->skb).portid,
84d2697d 4927 cb->nlh->nlmsg_seq,
053c095a 4928 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 4929 goto out;
7562f876 4930cont:
84d2697d
ED		 4931 idx++;
4932 }
1da177e4 4933 }
84d2697d
ED		 4934out:
4935 rcu_read_unlock();
4936 cb->args[1] = idx;
4937 cb->args[0] = h;
1da177e4
LT		 4938
4939 return skb->len;
4940}
4941
4942void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4943{
4944 struct sk_buff *skb;
c346dca1 4945 struct net *net = dev_net(idev->dev);
8d7a76c9 4946 int err = -ENOBUFS;
1ab1457c 4947
339bf98f 4948 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 4949 if (!skb)
8d7a76c9
TG		 4950 goto errout;
4951
4952 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4953 if (err < 0) {
4954 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4955 WARN_ON(err == -EMSGSIZE);
4956 kfree_skb(skb);
4957 goto errout;
4958 }
5f75a104 4959 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4960 return;
8d7a76c9
TG		 4961errout:
4962 if (err < 0)
5f75a104 4963 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4964}
4965
339bf98f
TG		 4966static inline size_t inet6_prefix_nlmsg_size(void)
4967{
4968 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4969 + nla_total_size(sizeof(struct in6_addr))
4970 + nla_total_size(sizeof(struct prefix_cacheinfo));
4971}
c5396a31 4972
1da177e4 4973static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4974 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 4975 int event, unsigned int flags)
1da177e4 4976{
6051e2f4
TG		 4977 struct prefixmsg *pmsg;
4978 struct nlmsghdr *nlh;
1da177e4
LT		 4979 struct prefix_cacheinfo ci;
4980
15e47304 4981 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 4982 if (!nlh)
26932566 4983 return -EMSGSIZE;
6051e2f4
TG		 4984
4985 pmsg = nlmsg_data(nlh);
1da177e4 4986 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4987 pmsg->prefix_pad1 = 0;
4988 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4989 pmsg->prefix_ifindex = idev->dev->ifindex;
4990 pmsg->prefix_len = pinfo->prefix_len;
4991 pmsg->prefix_type = pinfo->type;
8a47077a 4992 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4993 pmsg->prefix_flags = 0;
4994 if (pinfo->onlink)
4995 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4996 if (pinfo->autoconf)
4997 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4998
c78679e8
DM		 4999 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5000 goto nla_put_failure;
1da177e4
LT		 5001 ci.preferred_time = ntohl(pinfo->prefered);
5002 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5003 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5004 goto nla_put_failure;
053c095a
JB		 5005 nlmsg_end(skb, nlh);
5006 return 0;
1da177e4 5007
6051e2f4 5008nla_put_failure:
26932566
PM		 5009 nlmsg_cancel(skb, nlh);
5010 return -EMSGSIZE;
1da177e4
LT		 5011}
5012
1ab1457c 5013static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5014 struct prefix_info *pinfo)
5015{
5016 struct sk_buff *skb;
c346dca1 5017 struct net *net = dev_net(idev->dev);
8c384bfa 5018 int err = -ENOBUFS;
1da177e4 5019
339bf98f 5020 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5021 if (!skb)
8c384bfa
TG		 5022 goto errout;
5023
5024 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5025 if (err < 0) {
5026 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5027 WARN_ON(err == -EMSGSIZE);
5028 kfree_skb(skb);
5029 goto errout;
5030 }
1ce85fe4
PNA		 5031 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5032 return;
8c384bfa
TG		 5033errout:
5034 if (err < 0)
6fda7350 5035 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5036}
5037
1da177e4
LT		 5038static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5039{
63998ac2
ND		 5040 struct net *net = dev_net(ifp->idev->dev);
5041
c15b1cca
HFS		 5042 if (event)
5043 ASSERT_RTNL();
5044
1da177e4
LT		 5045 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5046
5047 switch (event) {
5048 case RTM_NEWADDR:
95c385b4
NH		 5049 /*
5050 * If the address was optimistic
5051 * we inserted the route at the start of
5052 * our DAD process, so we don't need
5053 * to do it again
5054 */
5055 if (!(ifp->rt->rt6i_node))
5056 ip6_ins_rt(ifp->rt);
1da177e4
LT		 5057 if (ifp->idev->cnf.forwarding)
5058 addrconf_join_anycast(ifp);
7996c799 5059 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 5060 addrconf_prefix_route(&ifp->peer_addr, 128,
5061 ifp->idev->dev, 0, 0);
1da177e4
LT		 5062 break;
5063 case RTM_DELADDR:
5064 if (ifp->idev->cnf.forwarding)
5065 addrconf_leave_anycast(ifp);
5066 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5067 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 5068 struct rt6_info *rt;
caeaba79 5069
e7478dfc
ND		 5070 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5071 ifp->idev->dev, 0, 0);
f24062b0
ND		 5072 if (rt && ip6_del_rt(rt))
5073 dst_free(&rt->dst);
caeaba79 5074 }
d8d1f30b 5075 dst_hold(&ifp->rt->dst);
93fa159a 5076
73a8bd74 5077 if (ip6_del_rt(ifp->rt))
d8d1f30b 5078 dst_free(&ifp->rt->dst);
705f1c86
HFS		 5079
5080 rt_genid_bump_ipv6(net);
1da177e4
LT		 5081 break;
5082 }
63998ac2 5083 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5084}
5085
5086static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5087{
8814c4b5 5088 rcu_read_lock_bh();
1da177e4
LT		 5089 if (likely(ifp->idev->dead == 0))
5090 __ipv6_ifa_notify(event, ifp);
8814c4b5 5091 rcu_read_unlock_bh();
1da177e4
LT		 5092}
5093
5094#ifdef CONFIG_SYSCTL
5095
5096static
fe2c6338 5097int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5098 void __user *buffer, size_t *lenp, loff_t *ppos)
5099{
5100 int *valp = ctl->data;
5101 int val = *valp;
88af182e 5102 loff_t pos = *ppos;
fe2c6338 5103 struct ctl_table lctl;
1da177e4
LT		 5104 int ret;
5105
013d97e9
FR		 5106 /*
5107 * ctl->data points to idev->cnf.forwarding, we should
5108 * not modify it until we get the rtnl lock.
5109 */
5110 lctl = *ctl;
5111 lctl.data = &val;
5112
5113 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5114
c8fecf22 5115 if (write)
b325fddb 5116 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5117 if (ret)
5118 *ppos = pos;
1ab1457c 5119 return ret;
1da177e4
LT		 5120}
5121
77751427
ML		 5122static
5123int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5124 void __user *buffer, size_t *lenp, loff_t *ppos)
5125{
5126 struct inet6_dev *idev = ctl->extra1;
5127 int min_mtu = IPV6_MIN_MTU;
5128 struct ctl_table lctl;
5129
5130 lctl = *ctl;
5131 lctl.extra1 = &min_mtu;
5132 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5133
5134 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5135}
5136
56d417b1
BH		 5137static void dev_disable_change(struct inet6_dev *idev)
5138{
75538c2b
CW		 5139 struct netdev_notifier_info info;
5140
56d417b1
BH		 5141 if (!idev || !idev->dev)
5142 return;
5143
75538c2b 5144 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5145 if (idev->cnf.disable_ipv6)
75538c2b 5146 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5147 else
75538c2b 5148 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5149}
5150
5151static void addrconf_disable_change(struct net *net, __s32 newf)
5152{
5153 struct net_device *dev;
5154 struct inet6_dev *idev;
5155
c6d14c84
ED		 5156 rcu_read_lock();
5157 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 5158 idev = __in6_dev_get(dev);
5159 if (idev) {
5160 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5161 idev->cnf.disable_ipv6 = newf;
5162 if (changed)
5163 dev_disable_change(idev);
5164 }
56d417b1 5165 }
c6d14c84 5166 rcu_read_unlock();
56d417b1
BH		 5167}
5168
013d97e9 5169static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5170{
5171 struct net *net;
013d97e9
FR		 5172 int old;
5173
5174 if (!rtnl_trylock())
5175 return restart_syscall();
56d417b1
BH		 5176
5177 net = (struct net *)table->extra2;
013d97e9
FR		 5178 old = *p;
5179 *p = newf;
56d417b1 5180
013d97e9
FR		 5181 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5182 rtnl_unlock();
56d417b1 5183 return 0;
88af182e 5184 }
56d417b1
BH		 5185
5186 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5187 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5188 addrconf_disable_change(net, newf);
013d97e9 5189 } else if ((!newf) ^ (!old))
56d417b1
BH		 5190 dev_disable_change((struct inet6_dev *)table->extra1);
5191
5192 rtnl_unlock();
5193 return 0;
5194}
5195
5196static
fe2c6338 5197int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5198 void __user *buffer, size_t *lenp, loff_t *ppos)
5199{
5200 int *valp = ctl->data;
5201 int val = *valp;
88af182e 5202 loff_t pos = *ppos;
fe2c6338 5203 struct ctl_table lctl;
56d417b1
BH		 5204 int ret;
5205
013d97e9
FR		 5206 /*
5207 * ctl->data points to idev->cnf.disable_ipv6, we should
5208 * not modify it until we get the rtnl lock.
5209 */
5210 lctl = *ctl;
5211 lctl.data = &val;
5212
5213 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5214
5215 if (write)
5216 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5217 if (ret)
5218 *ppos = pos;
56d417b1
BH		 5219 return ret;
5220}
5221
c92d5491 5222static
5223int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5224 void __user *buffer, size_t *lenp, loff_t *ppos)
5225{
5226 int *valp = ctl->data;
5227 int ret;
5228 int old, new;
5229
5230 old = *valp;
5231 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5232 new = *valp;
5233
5234 if (write && old != new) {
5235 struct net *net = ctl->extra2;
5236
5237 if (!rtnl_trylock())
5238 return restart_syscall();
5239
5240 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5241 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5242 NETCONFA_IFINDEX_DEFAULT,
5243 net->ipv6.devconf_dflt);
5244 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5245 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5246 NETCONFA_IFINDEX_ALL,
5247 net->ipv6.devconf_all);
5248 else {
5249 struct inet6_dev *idev = ctl->extra1;
5250
5251 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5252 idev->dev->ifindex,
5253 &idev->cnf);
5254 }
5255 rtnl_unlock();
5256 }
5257
5258 return ret;
5259}
5260
3d1bec99
HFS		 5261static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5262 void __user *buffer, size_t *lenp,
5263 loff_t *ppos)
5264{
5265 int err;
5266 struct in6_addr addr;
5267 char str[IPV6_MAX_STRLEN];
5268 struct ctl_table lctl = *ctl;
622c81d5 5269 struct net *net = ctl->extra2;
3d1bec99
HFS		 5270 struct ipv6_stable_secret *secret = ctl->data;
5271
622c81d5
HFS		 5272 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5273 return -EIO;
5274
3d1bec99
HFS		 5275 lctl.maxlen = IPV6_MAX_STRLEN;
5276 lctl.data = str;
5277
5278 if (!rtnl_trylock())
5279 return restart_syscall();
5280
5281 if (!write && !secret->initialized) {
5282 err = -EIO;
5283 goto out;
5284 }
5285
5286 if (!write) {
5287 err = snprintf(str, sizeof(str), "%pI6",
5288 &secret->secret);
5289 if (err >= sizeof(str)) {
5290 err = -EIO;
5291 goto out;
5292 }
5293 }
5294
5295 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5296 if (err || !write)
5297 goto out;
5298
5299 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5300 err = -EIO;
5301 goto out;
5302 }
5303
5304 secret->initialized = true;
5305 secret->secret = addr;
5306
622c81d5
HFS		 5307 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5308 struct net_device *dev;
5309
5310 for_each_netdev(net, dev) {
5311 struct inet6_dev *idev = __in6_dev_get(dev);
5312
5313 if (idev) {
5314 idev->addr_gen_mode =
5315 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5316 }
5317 }
5318 } else {
5319 struct inet6_dev *idev = ctl->extra1;
5320
5321 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5322 }
5323
3d1bec99
HFS		 5324out:
5325 rtnl_unlock();
5326
5327 return err;
5328}
c92d5491 5329
1da177e4
LT		 5330static struct addrconf_sysctl_table
5331{
5332 struct ctl_table_header *sysctl_header;
fe2c6338 5333 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 5334} addrconf_sysctl __read_mostly = {
1da177e4
LT		 5335 .sysctl_header = NULL,
5336 .addrconf_vars = {
1ab1457c 5337 {
e21e8467
SH		 5338 .procname = "forwarding",
5339 .data = &ipv6_devconf.forwarding,
5340 .maxlen = sizeof(int),
5341 .mode = 0644,
5342 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 5343 },
5344 {
e21e8467
SH		 5345 .procname = "hop_limit",
5346 .data = &ipv6_devconf.hop_limit,
5347 .maxlen = sizeof(int),
5348 .mode = 0644,
5349 .proc_handler = proc_dointvec,
1da177e4
LT		 5350 },
5351 {
e21e8467
SH		 5352 .procname = "mtu",
5353 .data = &ipv6_devconf.mtu6,
5354 .maxlen = sizeof(int),
5355 .mode = 0644,
77751427 5356 .proc_handler = addrconf_sysctl_mtu,
1da177e4
LT		 5357 },
5358 {
e21e8467
SH		 5359 .procname = "accept_ra",
5360 .data = &ipv6_devconf.accept_ra,
5361 .maxlen = sizeof(int),
5362 .mode = 0644,
5363 .proc_handler = proc_dointvec,
1da177e4
LT		 5364 },
5365 {
e21e8467
SH		 5366 .procname = "accept_redirects",
5367 .data = &ipv6_devconf.accept_redirects,
5368 .maxlen = sizeof(int),
5369 .mode = 0644,
5370 .proc_handler = proc_dointvec,
1da177e4
LT		 5371 },
5372 {
e21e8467
SH		 5373 .procname = "autoconf",
5374 .data = &ipv6_devconf.autoconf,
5375 .maxlen = sizeof(int),
5376 .mode = 0644,
5377 .proc_handler = proc_dointvec,
1da177e4
LT		 5378 },
5379 {
e21e8467
SH		 5380 .procname = "dad_transmits",
5381 .data = &ipv6_devconf.dad_transmits,
5382 .maxlen = sizeof(int),
5383 .mode = 0644,
5384 .proc_handler = proc_dointvec,
1da177e4
LT		 5385 },
5386 {
e21e8467
SH		 5387 .procname = "router_solicitations",
5388 .data = &ipv6_devconf.rtr_solicits,
5389 .maxlen = sizeof(int),
5390 .mode = 0644,
5391 .proc_handler = proc_dointvec,
1da177e4
LT		 5392 },
5393 {
e21e8467
SH		 5394 .procname = "router_solicitation_interval",
5395 .data = &ipv6_devconf.rtr_solicit_interval,
5396 .maxlen = sizeof(int),
5397 .mode = 0644,
5398 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5399 },
5400 {
e21e8467
SH		 5401 .procname = "router_solicitation_delay",
5402 .data = &ipv6_devconf.rtr_solicit_delay,
5403 .maxlen = sizeof(int),
5404 .mode = 0644,
5405 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 5406 },
5407 {
e21e8467
SH		 5408 .procname = "force_mld_version",
5409 .data = &ipv6_devconf.force_mld_version,
5410 .maxlen = sizeof(int),
5411 .mode = 0644,
5412 .proc_handler = proc_dointvec,
1da177e4 5413 },
fc4eba58
HFS		 5414 {
5415 .procname = "mldv1_unsolicited_report_interval",
5416 .data =
5417 &ipv6_devconf.mldv1_unsolicited_report_interval,
5418 .maxlen = sizeof(int),
5419 .mode = 0644,
5420 .proc_handler = proc_dointvec_ms_jiffies,
5421 },
5422 {
5423 .procname = "mldv2_unsolicited_report_interval",
5424 .data =
5425 &ipv6_devconf.mldv2_unsolicited_report_interval,
5426 .maxlen = sizeof(int),
5427 .mode = 0644,
5428 .proc_handler = proc_dointvec_ms_jiffies,
5429 },
1da177e4 5430 {
e21e8467
SH		 5431 .procname = "use_tempaddr",
5432 .data = &ipv6_devconf.use_tempaddr,
5433 .maxlen = sizeof(int),
5434 .mode = 0644,
5435 .proc_handler = proc_dointvec,
1da177e4
LT		 5436 },
5437 {
e21e8467
SH		 5438 .procname = "temp_valid_lft",
5439 .data = &ipv6_devconf.temp_valid_lft,
5440 .maxlen = sizeof(int),
5441 .mode = 0644,
5442 .proc_handler = proc_dointvec,
1da177e4
LT		 5443 },
5444 {
e21e8467
SH		 5445 .procname = "temp_prefered_lft",
5446 .data = &ipv6_devconf.temp_prefered_lft,
5447 .maxlen = sizeof(int),
5448 .mode = 0644,
5449 .proc_handler = proc_dointvec,
1da177e4
LT		 5450 },
5451 {
e21e8467
SH		 5452 .procname = "regen_max_retry",
5453 .data = &ipv6_devconf.regen_max_retry,
5454 .maxlen = sizeof(int),
5455 .mode = 0644,
5456 .proc_handler = proc_dointvec,
1da177e4
LT		 5457 },
5458 {
e21e8467
SH		 5459 .procname = "max_desync_factor",
5460 .data = &ipv6_devconf.max_desync_factor,
5461 .maxlen = sizeof(int),
5462 .mode = 0644,
5463 .proc_handler = proc_dointvec,
1da177e4 5464 },
1da177e4 5465 {
e21e8467
SH		 5466 .procname = "max_addresses",
5467 .data = &ipv6_devconf.max_addresses,
5468 .maxlen = sizeof(int),
5469 .mode = 0644,
5470 .proc_handler = proc_dointvec,
1da177e4 5471 },
65f5c7c1 5472 {
e21e8467
SH		 5473 .procname = "accept_ra_defrtr",
5474 .data = &ipv6_devconf.accept_ra_defrtr,
5475 .maxlen = sizeof(int),
5476 .mode = 0644,
5477 .proc_handler = proc_dointvec,
65f5c7c1 5478 },
c4fd30eb 5479 {
e21e8467
SH		 5480 .procname = "accept_ra_pinfo",
5481 .data = &ipv6_devconf.accept_ra_pinfo,
5482 .maxlen = sizeof(int),
5483 .mode = 0644,
5484 .proc_handler = proc_dointvec,
c4fd30eb 5485 },
930d6ff2
YH		 5486#ifdef CONFIG_IPV6_ROUTER_PREF
5487 {
e21e8467
SH		 5488 .procname = "accept_ra_rtr_pref",
5489 .data = &ipv6_devconf.accept_ra_rtr_pref,
5490 .maxlen = sizeof(int),
5491 .mode = 0644,
5492 .proc_handler = proc_dointvec,
930d6ff2 5493 },
52e16356 5494 {
e21e8467
SH		 5495 .procname = "router_probe_interval",
5496 .data = &ipv6_devconf.rtr_probe_interval,
5497 .maxlen = sizeof(int),
5498 .mode = 0644,
5499 .proc_handler = proc_dointvec_jiffies,
52e16356 5500 },
fa03ef38 5501#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 5502 {
e21e8467
SH		 5503 .procname = "accept_ra_rt_info_max_plen",
5504 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5505 .maxlen = sizeof(int),
5506 .mode = 0644,
5507 .proc_handler = proc_dointvec,
09c884d4
YH		 5508 },
5509#endif
930d6ff2 5510#endif
fbea49e1 5511 {
e21e8467
SH		 5512 .procname = "proxy_ndp",
5513 .data = &ipv6_devconf.proxy_ndp,
5514 .maxlen = sizeof(int),
5515 .mode = 0644,
c92d5491 5516 .proc_handler = addrconf_sysctl_proxy_ndp,
fbea49e1 5517 },
0bcbc926 5518 {
e21e8467
SH		 5519 .procname = "accept_source_route",
5520 .data = &ipv6_devconf.accept_source_route,
5521 .maxlen = sizeof(int),
5522 .mode = 0644,
5523 .proc_handler = proc_dointvec,
0bcbc926 5524 },
95c385b4
NH		 5525#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5526 {
e21e8467
SH		 5527 .procname = "optimistic_dad",
5528 .data = &ipv6_devconf.optimistic_dad,
5529 .maxlen = sizeof(int),
5530 .mode = 0644,
5531 .proc_handler = proc_dointvec,
95c385b4
NH		 5532
5533 },
7fd2561e
EK		 5534 {
5535 .procname = "use_optimistic",
5536 .data = &ipv6_devconf.use_optimistic,
5537 .maxlen = sizeof(int),
5538 .mode = 0644,
5539 .proc_handler = proc_dointvec,
5540
5541 },
7bc570c8
YH		 5542#endif
5543#ifdef CONFIG_IPV6_MROUTE
5544 {
e21e8467
SH		 5545 .procname = "mc_forwarding",
5546 .data = &ipv6_devconf.mc_forwarding,
5547 .maxlen = sizeof(int),
5548 .mode = 0444,
5549 .proc_handler = proc_dointvec,
7bc570c8 5550 },
95c385b4 5551#endif
778d80be 5552 {
e21e8467
SH		 5553 .procname = "disable_ipv6",
5554 .data = &ipv6_devconf.disable_ipv6,
5555 .maxlen = sizeof(int),
5556 .mode = 0644,
5557 .proc_handler = addrconf_sysctl_disable,
778d80be 5558 },
1b34be74 5559 {
e21e8467
SH		 5560 .procname = "accept_dad",
5561 .data = &ipv6_devconf.accept_dad,
5562 .maxlen = sizeof(int),
5563 .mode = 0644,
5564 .proc_handler = proc_dointvec,
1b34be74 5565 },
f7734fdf 5566 {
f7734fdf
OP		 5567 .procname = "force_tllao",
5568 .data = &ipv6_devconf.force_tllao,
5569 .maxlen = sizeof(int),
5570 .mode = 0644,
5571 .proc_handler = proc_dointvec
5572 },
5cb04436
HFS		 5573 {
5574 .procname = "ndisc_notify",
5575 .data = &ipv6_devconf.ndisc_notify,
5576 .maxlen = sizeof(int),
5577 .mode = 0644,
5578 .proc_handler = proc_dointvec
5579 },
b800c3b9
HFS		 5580 {
5581 .procname = "suppress_frag_ndisc",
5582 .data = &ipv6_devconf.suppress_frag_ndisc,
5583 .maxlen = sizeof(int),
5584 .mode = 0644,
5585 .proc_handler = proc_dointvec
5586 },
d9333196
BG		 5587 {
5588 .procname = "accept_ra_from_local",
5589 .data = &ipv6_devconf.accept_ra_from_local,
5590 .maxlen = sizeof(int),
5591 .mode = 0644,
5592 .proc_handler = proc_dointvec,
5593 },
c2943f14
HH		 5594 {
5595 .procname = "accept_ra_mtu",
5596 .data = &ipv6_devconf.accept_ra_mtu,
5597 .maxlen = sizeof(int),
5598 .mode = 0644,
5599 .proc_handler = proc_dointvec,
5600 },
3d1bec99
HFS		 5601 {
5602 .procname = "stable_secret",
5603 .data = &ipv6_devconf.stable_secret,
5604 .maxlen = IPV6_MAX_STRLEN,
5605 .mode = 0600,
5606 .proc_handler = addrconf_sysctl_stable_secret,
5607 },
1da177e4 5608 {
f8572d8f 5609 /* sentinel */
1da177e4
LT		 5610 }
5611 },
1da177e4
LT		 5612};
5613
bff16c2f 5614static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 5615 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 5616{
5617 int i;
1da177e4 5618 struct addrconf_sysctl_table *t;
6105e293 5619 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 5620
af879cc7 5621 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
63159f29 5622 if (!t)
f68635e6
PE		 5623 goto out;
5624
bcdd553f 5625 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 5626 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 5627 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 5628 t->addrconf_vars[i].extra2 = net;
1da177e4 5629 }
1da177e4 5630
6105e293 5631 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 5632
6105e293 5633 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
63159f29 5634 if (!t->sysctl_header)
6105e293 5635 goto free;
f68635e6
PE		 5636
5637 p->sysctl = t;
95897312 5638 return 0;
1da177e4 5639
f68635e6 5640free:
1da177e4 5641 kfree(t);
f68635e6 5642out:
95897312 5643 return -ENOBUFS;
1da177e4
LT		 5644}
5645
408c4768
PE		 5646static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5647{
5648 struct addrconf_sysctl_table *t;
5649
63159f29 5650 if (!p->sysctl)
408c4768
PE		 5651 return;
5652
5653 t = p->sysctl;
5654 p->sysctl = NULL;
ff538818 5655 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 5656 kfree(t);
5657}
5658
a317a2f1 5659static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 5660{
a317a2f1
WC		 5661 int err;
5662
5663 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5664 return -EINVAL;
5665
5666 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5667 &ndisc_ifinfo_sysctl_change);
5668 if (err)
5669 return err;
5670 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5671 idev, &idev->cnf);
5672 if (err)
5673 neigh_sysctl_unregister(idev->nd_parms);
5674
5675 return err;
f52295a9
PE		 5676}
5677
408c4768 5678static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 5679{
408c4768
PE		 5680 __addrconf_sysctl_unregister(&idev->cnf);
5681 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 5682}
5683
5684
5685#endif
5686
2c8c1e72 5687static int __net_init addrconf_init_net(struct net *net)
e0da5a48 5688{
a79ca223 5689 int err = -ENOMEM;
e0da5a48
PE		 5690 struct ipv6_devconf *all, *dflt;
5691
a79ca223 5692 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 5693 if (!all)
a79ca223 5694 goto err_alloc_all;
e0da5a48 5695
a79ca223 5696 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 5697 if (!dflt)
a79ca223 5698 goto err_alloc_dflt;
e0da5a48 5699
a79ca223
HZ		 5700 /* these will be inherited by all namespaces */
5701 dflt->autoconf = ipv6_defaults.autoconf;
5702 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 5703
3d1bec99
HFS		 5704 dflt->stable_secret.initialized = false;
5705 all->stable_secret.initialized = false;
5706
e0da5a48
PE		 5707 net->ipv6.devconf_all = all;
5708 net->ipv6.devconf_dflt = dflt;
5709
5710#ifdef CONFIG_SYSCTL
f8572d8f 5711 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 5712 if (err < 0)
5713 goto err_reg_all;
5714
f8572d8f 5715 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 5716 if (err < 0)
5717 goto err_reg_dflt;
5718#endif
5719 return 0;
5720
5721#ifdef CONFIG_SYSCTL
5722err_reg_dflt:
5723 __addrconf_sysctl_unregister(all);
5724err_reg_all:
5725 kfree(dflt);
5726#endif
5727err_alloc_dflt:
5728 kfree(all);
5729err_alloc_all:
5730 return err;
5731}
5732
2c8c1e72 5733static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 5734{
5735#ifdef CONFIG_SYSCTL
5736 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5737 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5738#endif
73cf0e92 5739 kfree(net->ipv6.devconf_dflt);
5740 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 5741}
5742
5743static struct pernet_operations addrconf_ops = {
5744 .init = addrconf_init_net,
5745 .exit = addrconf_exit_net,
5746};
5747
207895fd 5748static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 5749 .family = AF_INET6,
5750 .fill_link_af = inet6_fill_link_af,
5751 .get_link_af_size = inet6_get_link_af_size,
11b1f828 5752 .validate_link_af = inet6_validate_link_af,
f53adae4 5753 .set_link_af = inet6_set_link_af,
b382b191
TG		 5754};
5755
1da177e4
LT		 5756/*
5757 * Init / cleanup code
5758 */
5759
5760int __init addrconf_init(void)
5761{
a317a2f1 5762 struct inet6_dev *idev;
c2e21293 5763 int i, err;
2a8cc6c8 5764
e21e8467
SH		 5765 err = ipv6_addr_label_init();
5766 if (err < 0) {
f3213831
JP		 5767 pr_crit("%s: cannot initialize default policy table: %d\n",
5768 __func__, err);
2cc6d2bf 5769 goto out;
2a8cc6c8 5770 }
1da177e4 5771
2cc6d2bf
NH		 5772 err = register_pernet_subsys(&addrconf_ops);
5773 if (err < 0)
5774 goto out_addrlabel;
e0da5a48 5775
c15b1cca
HFS		 5776 addrconf_wq = create_workqueue("ipv6_addrconf");
5777 if (!addrconf_wq) {
5778 err = -ENOMEM;
5779 goto out_nowq;
5780 }
5781
1da177e4
LT		 5782 /* The addrconf netdev notifier requires that loopback_dev
5783 * has it's ipv6 private information allocated and setup
5784 * before it can bring up and give link-local addresses
5785 * to other devices which are up.
5786 *
5787 * Unfortunately, loopback_dev is not necessarily the first
5788 * entry in the global dev_base list of net devices. In fact,
5789 * it is likely to be the very last entry on that list.
5790 * So this causes the notifier registry below to try and
5791 * give link-local addresses to all devices besides loopback_dev
5792 * first, then loopback_dev, which cases all the non-loopback_dev
5793 * devices to fail to get a link-local address.
5794 *
5795 * So, as a temporary fix, allocate the ipv6 structure for
5796 * loopback_dev first by hand.
5797 * Longer term, all of the dependencies ipv6 has upon the loopback
5798 * device and it being up should be removed.
5799 */
5800 rtnl_lock();
a317a2f1 5801 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 5802 rtnl_unlock();
a317a2f1
WC		 5803 if (IS_ERR(idev)) {
5804 err = PTR_ERR(idev);
e0da5a48 5805 goto errlo;
a317a2f1 5806 }
1da177e4 5807
c2e21293 5808 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5809 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5810
1da177e4
LT		 5811 register_netdevice_notifier(&ipv6_dev_notf);
5812
c15b1cca 5813 addrconf_verify();
c127ea2c 5814
3678a9d8 5815 rtnl_af_register(&inet6_ops);
b382b191 5816
c7ac8679
GR		 5817 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5818 NULL);
c127ea2c
TG		 5819 if (err < 0)
5820 goto errout;
5821
5822 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 5823 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5824 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5825 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5826 inet6_dump_ifaddr, NULL);
5827 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5828 inet6_dump_ifmcaddr, NULL);
5829 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5830 inet6_dump_ifacaddr, NULL);
76f8f6cb 5831 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 5832 inet6_netconf_dump_devconf, NULL);
c127ea2c 5833
2a8cc6c8
YH		 5834 ipv6_addr_label_rtnl_register();
5835
1da177e4 5836 return 0;
c127ea2c 5837errout:
b382b191 5838 rtnl_af_unregister(&inet6_ops);
c127ea2c 5839 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5840errlo:
c15b1cca
HFS		 5841 destroy_workqueue(addrconf_wq);
5842out_nowq:
e0da5a48 5843 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 5844out_addrlabel:
5845 ipv6_addr_label_cleanup();
5846out:
c127ea2c 5847 return err;
1da177e4
LT		 5848}
5849
09f7709f 5850void addrconf_cleanup(void)
1da177e4 5851{
176c39af 5852 struct net_device *dev;
1da177e4
LT		 5853 int i;
5854
5855 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 5856 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 5857 ipv6_addr_label_cleanup();
1da177e4
LT		 5858
5859 rtnl_lock();
5860
b382b191
TG		 5861 __rtnl_af_unregister(&inet6_ops);
5862
176c39af
DL		 5863 /* clean dev list */
5864 for_each_netdev(&init_net, dev) {
5865 if (__in6_dev_get(dev) == NULL)
5866 continue;
5867 addrconf_ifdown(dev, 1);
5868 }
5869 addrconf_ifdown(init_net.loopback_dev, 2);
5870
1da177e4
LT		 5871 /*
5872 * Check hash table.
5873 */
5c578aed 5874 spin_lock_bh(&addrconf_hash_lock);
c2e21293 5875 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5876 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 5877 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 5878 cancel_delayed_work(&addr_chk_work);
1da177e4 5879 rtnl_unlock();
c15b1cca
HFS		 5880
5881 destroy_workqueue(addrconf_wq);
1da177e4 5882}
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