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[mirror_ubuntu-bionic-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>
174cd4b1 46#include <linux/sched/signal.h>
1da177e4
LT		 47#include <linux/socket.h>
48#include <linux/sockios.h>
1da177e4 49#include <linux/net.h>
3d1bec99 50#include <linux/inet.h>
1da177e4
LT		 51#include <linux/in6.h>
52#include <linux/netdevice.h>
1823730f 53#include <linux/if_addr.h>
1da177e4
LT		 54#include <linux/if_arp.h>
55#include <linux/if_arcnet.h>
56#include <linux/if_infiniband.h>
57#include <linux/route.h>
58#include <linux/inetdevice.h>
59#include <linux/init.h>
5a0e3ad6 60#include <linux/slab.h>
1da177e4
LT		 61#ifdef CONFIG_SYSCTL
62#include <linux/sysctl.h>
63#endif
4fc268d2 64#include <linux/capability.h>
1da177e4
LT		 65#include <linux/delay.h>
66#include <linux/notifier.h>
543537bd 67#include <linux/string.h>
ddbe5032 68#include <linux/hash.h>
1da177e4 69
457c4cbc 70#include <net/net_namespace.h>
1da177e4
LT		 71#include <net/sock.h>
72#include <net/snmp.h>
73
5241c2d7 74#include <net/6lowpan.h>
cb6bf355 75#include <net/firewire.h>
1da177e4
LT		 76#include <net/ipv6.h>
77#include <net/protocol.h>
78#include <net/ndisc.h>
79#include <net/ip6_route.h>
80#include <net/addrconf.h>
81#include <net/tcp.h>
82#include <net/ip.h>
5d620266 83#include <net/netlink.h>
f24e3d65 84#include <net/pkt_sched.h>
ca254490 85#include <net/l3mdev.h>
1da177e4
LT		 86#include <linux/if_tunnel.h>
87#include <linux/rtnetlink.h>
f3a1bfb1 88#include <linux/netconf.h>
1da177e4 89#include <linux/random.h>
e21e8467 90#include <linux/uaccess.h>
7f7d9a6b 91#include <asm/unaligned.h>
1da177e4
LT		 92
93#include <linux/proc_fs.h>
94#include <linux/seq_file.h>
bc3b2d7f 95#include <linux/export.h>
1da177e4
LT		 96
97/* Set to 3 to get tracing... */
98#define ACONF_DEBUG 2
99
100#if ACONF_DEBUG >= 3
ba3542e1 101#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
1da177e4 102#else
ba3542e1 103#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
1da177e4
LT		 104#endif
105
106#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e 107
3d1bec99
HFS		 108#define IPV6_MAX_STRLEN \
109 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
110
18a31e1e
TG		 111static inline u32 cstamp_delta(unsigned long cstamp)
112{
113 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
114}
1da177e4 115
bd11f074
MŻ		 116static inline s32 rfc3315_s14_backoff_init(s32 irt)
117{
118 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
119 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
120 do_div(tmp, 1000000);
121 return (s32)tmp;
122}
123
124static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
125{
126 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
127 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
128 do_div(tmp, 1000000);
129 if ((s32)tmp > mrt) {
130 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
131 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
132 do_div(tmp, 1000000);
133 }
134 return (s32)tmp;
135}
136
1da177e4 137#ifdef CONFIG_SYSCTL
a317a2f1 138static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 139static void addrconf_sysctl_unregister(struct inet6_dev *idev);
140#else
a317a2f1 141static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 142{
a317a2f1 143 return 0;
408c4768
PE		 144}
145
146static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
147{
148}
1da177e4
LT		 149#endif
150
9d6280da
JB		 151static void ipv6_regen_rndid(struct inet6_dev *idev);
152static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 153
1b34be74 154static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4 155static int ipv6_count_addresses(struct inet6_dev *idev);
622c81d5
HFS		 156static int ipv6_generate_stable_address(struct in6_addr *addr,
157 u8 dad_count,
158 const struct inet6_dev *idev);
1da177e4
LT		 159
160/*
161 * Configured unicast address hash table
162 */
c2e21293 163static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 164static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 165
c15b1cca
HFS		 166static void addrconf_verify(void);
167static void addrconf_verify_rtnl(void);
168static void addrconf_verify_work(struct work_struct *);
1da177e4 169
c15b1cca
HFS		 170static struct workqueue_struct *addrconf_wq;
171static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 172
173static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
174static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
175
93d9b7d7
JP		 176static void addrconf_type_change(struct net_device *dev,
177 unsigned long event);
1da177e4
LT		 178static int addrconf_ifdown(struct net_device *dev, int how);
179
21caa662
RK		 180static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
181 int plen,
182 const struct net_device *dev,
183 u32 flags, u32 noflags);
184
cf22f9a2 185static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 186static void addrconf_dad_work(struct work_struct *w);
764d3be6 187static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id);
c5e33bdd 188static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 189static void addrconf_rs_timer(unsigned long data);
190static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
191static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
192
1ab1457c 193static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 194 struct prefix_info *pinfo);
3e81c6da
DM		 195static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
196 struct net_device *dev);
1da177e4 197
888c848e 198static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 199 .forwarding = 0,
200 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
201 .mtu6 = IPV6_MIN_MTU,
202 .accept_ra = 1,
203 .accept_redirects = 1,
204 .autoconf = 1,
205 .force_mld_version = 0,
fc4eba58
HFS		 206 .mldv1_unsolicited_report_interval = 10 * HZ,
207 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 208 .dad_transmits = 1,
209 .rtr_solicits = MAX_RTR_SOLICITATIONS,
210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 211 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 212 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 213 .use_tempaddr = 0,
1da177e4
LT		 214 .temp_valid_lft = TEMP_VALID_LIFETIME,
215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
216 .regen_max_retry = REGEN_MAX_RETRY,
217 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 218 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 219 .accept_ra_defrtr = 1,
d9333196 220 .accept_ra_from_local = 0,
8013d1d7 221 .accept_ra_min_hop_limit= 1,
c4fd30eb 222 .accept_ra_pinfo = 1,
930d6ff2
YH		 223#ifdef CONFIG_IPV6_ROUTER_PREF
224 .accept_ra_rtr_pref = 1,
52e16356 225 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 226#ifdef CONFIG_IPV6_ROUTE_INFO
227 .accept_ra_rt_info_max_plen = 0,
228#endif
930d6ff2 229#endif
fbea49e1 230 .proxy_ndp = 0,
0bcbc926 231 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 232 .disable_ipv6 = 0,
1b34be74 233 .accept_dad = 1,
b800c3b9 234 .suppress_frag_ndisc = 1,
c2943f14 235 .accept_ra_mtu = 1,
3d1bec99
HFS		 236 .stable_secret = {
237 .initialized = false,
3985e8a3
EK		 238 },
239 .use_oif_addrs_only = 0,
35103d11 240 .ignore_routes_with_linkdown = 0,
f1705ec1 241 .keep_addr_on_down = 0,
1ababeba 242 .seg6_enabled = 0,
bf355b8d
DL		 243#ifdef CONFIG_IPV6_SEG6_HMAC
244 .seg6_require_hmac = 0,
245#endif
adc176c5 246 .enhanced_dad = 1,
d35a00b8 247 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
1da177e4
LT		 248};
249
ab32ea5d 250static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 251 .forwarding = 0,
252 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
253 .mtu6 = IPV6_MIN_MTU,
254 .accept_ra = 1,
255 .accept_redirects = 1,
256 .autoconf = 1,
fc4eba58
HFS		 257 .force_mld_version = 0,
258 .mldv1_unsolicited_report_interval = 10 * HZ,
259 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 260 .dad_transmits = 1,
261 .rtr_solicits = MAX_RTR_SOLICITATIONS,
262 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 263 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 264 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 265 .use_tempaddr = 0,
266 .temp_valid_lft = TEMP_VALID_LIFETIME,
267 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
268 .regen_max_retry = REGEN_MAX_RETRY,
269 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 270 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 271 .accept_ra_defrtr = 1,
d9333196 272 .accept_ra_from_local = 0,
8013d1d7 273 .accept_ra_min_hop_limit= 1,
c4fd30eb 274 .accept_ra_pinfo = 1,
930d6ff2
YH		 275#ifdef CONFIG_IPV6_ROUTER_PREF
276 .accept_ra_rtr_pref = 1,
52e16356 277 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 278#ifdef CONFIG_IPV6_ROUTE_INFO
279 .accept_ra_rt_info_max_plen = 0,
280#endif
930d6ff2 281#endif
fbea49e1 282 .proxy_ndp = 0,
0bcbc926 283 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 284 .disable_ipv6 = 0,
1b34be74 285 .accept_dad = 1,
b800c3b9 286 .suppress_frag_ndisc = 1,
c2943f14 287 .accept_ra_mtu = 1,
3d1bec99
HFS		 288 .stable_secret = {
289 .initialized = false,
290 },
3985e8a3 291 .use_oif_addrs_only = 0,
35103d11 292 .ignore_routes_with_linkdown = 0,
f1705ec1 293 .keep_addr_on_down = 0,
1ababeba 294 .seg6_enabled = 0,
bf355b8d
DL		 295#ifdef CONFIG_IPV6_SEG6_HMAC
296 .seg6_require_hmac = 0,
297#endif
adc176c5 298 .enhanced_dad = 1,
d35a00b8 299 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
1da177e4
LT		 300};
301
f24e3d65 302/* Check if a valid qdisc is available */
05297949 303static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 304{
05297949 305 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 306}
307
b7b1bfce 308static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 309{
b7b1bfce
HFS		 310 if (del_timer(&idev->rs_timer))
311 __in6_dev_put(idev);
312}
313
c15b1cca 314static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 315{
c15b1cca 316 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 317 __in6_ifa_put(ifp);
318}
319
b7b1bfce
HFS		 320static void addrconf_mod_rs_timer(struct inet6_dev *idev,
321 unsigned long when)
322{
323 if (!timer_pending(&idev->rs_timer))
324 in6_dev_hold(idev);
325 mod_timer(&idev->rs_timer, jiffies + when);
326}
1da177e4 327
c15b1cca
HFS		 328static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
329 unsigned long delay)
1da177e4 330{
c15b1cca 331 if (!delayed_work_pending(&ifp->dad_work))
1da177e4 332 in6_ifa_hold(ifp);
c15b1cca 333 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
1da177e4
LT		 334}
335
7f7d9a6b
HX		 336static int snmp6_alloc_dev(struct inet6_dev *idev)
337{
827da44c
JS		 338 int i;
339
698365fa
WC		 340 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
341 if (!idev->stats.ipv6)
7f7d9a6b 342 goto err_ip;
827da44c
JS		 343
344 for_each_possible_cpu(i) {
345 struct ipstats_mib *addrconf_stats;
698365fa 346 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 347 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 348 }
349
350
be281e55
ED		 351 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
352 GFP_KERNEL);
353 if (!idev->stats.icmpv6dev)
7f7d9a6b 354 goto err_icmp;
be281e55
ED		 355 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
356 GFP_KERNEL);
357 if (!idev->stats.icmpv6msgdev)
14878f75 358 goto err_icmpmsg;
7f7d9a6b
HX		 359
360 return 0;
361
14878f75 362err_icmpmsg:
be281e55 363 kfree(idev->stats.icmpv6dev);
7f7d9a6b 364err_icmp:
698365fa 365 free_percpu(idev->stats.ipv6);
7f7d9a6b 366err_ip:
aaf70ec7 367 return -ENOMEM;
7f7d9a6b
HX		 368}
369
8e5e8f30 370static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 371{
372 struct inet6_dev *ndev;
a317a2f1 373 int err = -ENOMEM;
1da177e4
LT		 374
375 ASSERT_RTNL();
376
377 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 378 return ERR_PTR(-EINVAL);
1da177e4 379
1ab1457c 380 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
63159f29 381 if (!ndev)
a317a2f1 382 return ERR_PTR(err);
322f74a4
IO		 383
384 rwlock_init(&ndev->lock);
385 ndev->dev = dev;
502a2ffd 386 INIT_LIST_HEAD(&ndev->addr_list);
b7b1bfce
HFS		 387 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
388 (unsigned long)ndev);
c346dca1 389 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
9b29c696
HFS		 390
391 if (ndev->cnf.stable_secret.initialized)
d35a00b8 392 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
9b29c696 393 else
d35a00b8 394 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode;
9b29c696 395
322f74a4 396 ndev->cnf.mtu6 = dev->mtu;
322f74a4 397 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
63159f29 398 if (!ndev->nd_parms) {
322f74a4 399 kfree(ndev);
a317a2f1 400 return ERR_PTR(err);
322f74a4 401 }
0187bdfb
BH		 402 if (ndev->cnf.forwarding)
403 dev_disable_lro(dev);
322f74a4
IO		 404 /* We refer to the device */
405 dev_hold(dev);
1da177e4 406
322f74a4 407 if (snmp6_alloc_dev(ndev) < 0) {
ba3542e1 408 ADBG(KERN_WARNING
f3213831 409 "%s: cannot allocate memory for statistics; dev=%s.\n",
ba3542e1 410 __func__, dev->name);
322f74a4 411 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 412 dev_put(dev);
413 kfree(ndev);
a317a2f1 414 return ERR_PTR(err);
322f74a4 415 }
1da177e4 416
322f74a4 417 if (snmp6_register_dev(ndev) < 0) {
ba3542e1 418 ADBG(KERN_WARNING
f3213831 419 "%s: cannot create /proc/net/dev_snmp6/%s\n",
ba3542e1 420 __func__, dev->name);
a317a2f1 421 goto err_release;
322f74a4
IO		 422 }
423
9d6280da 424 /* One reference from device. */
322f74a4 425 in6_dev_hold(ndev);
1da177e4 426
1b34be74
YH		 427 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
428 ndev->cnf.accept_dad = -1;
429
07a93626 430#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 431 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 432 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 433 ndev->cnf.rtr_solicits = 0;
434 }
435#endif
436
372e6c8f 437 INIT_LIST_HEAD(&ndev->tempaddr_list);
76506a98 438 ndev->desync_factor = U32_MAX;
322f74a4
IO		 439 if ((dev->flags&IFF_LOOPBACK) ||
440 dev->type == ARPHRD_TUNNEL ||
9625ed72 441 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 442 dev->type == ARPHRD_SIT ||
0be669bb 443 dev->type == ARPHRD_NONE) {
322f74a4 444 ndev->cnf.use_tempaddr = -1;
9d6280da
JB		 445 } else
446 ipv6_regen_rndid(ndev);
5d9efa7e 447
914faa14 448 ndev->token = in6addr_any;
1da177e4 449
f24e3d65 450 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 451 ndev->if_flags |= IF_READY;
452
322f74a4
IO		 453 ipv6_mc_init_dev(ndev);
454 ndev->tstamp = jiffies;
a317a2f1
WC		 455 err = addrconf_sysctl_register(ndev);
456 if (err) {
457 ipv6_mc_destroy_dev(ndev);
2a189f9e 458 snmp6_unregister_dev(ndev);
a317a2f1
WC		 459 goto err_release;
460 }
30c4cf57 461 /* protected by rtnl_lock */
cf778b00 462 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 463
2c5e8933
HFS		 464 /* Join interface-local all-node multicast group */
465 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
466
d88ae4cc 467 /* Join all-node multicast group */
f3ee4010 468 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 469
d6ddef9e 470 /* Join all-router multicast group if forwarding is set */
8b2aaede 471 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 472 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
473
1da177e4 474 return ndev;
a317a2f1
WC		 475
476err_release:
477 neigh_parms_release(&nd_tbl, ndev->nd_parms);
478 ndev->dead = 1;
479 in6_dev_finish_destroy(ndev);
480 return ERR_PTR(err);
1da177e4
LT		 481}
482
8e5e8f30 483static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 484{
485 struct inet6_dev *idev;
486
487 ASSERT_RTNL();
488
e21e8467
SH		 489 idev = __in6_dev_get(dev);
490 if (!idev) {
491 idev = ipv6_add_dev(dev);
a317a2f1 492 if (IS_ERR(idev))
1da177e4
LT		 493 return NULL;
494 }
c5e33bdd 495
1da177e4
LT		 496 if (dev->flags&IFF_UP)
497 ipv6_mc_up(idev);
498 return idev;
499}
500
f3a1bfb1
ND		 501static int inet6_netconf_msgsize_devconf(int type)
502{
503 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
504 + nla_total_size(4); /* NETCONFA_IFINDEX */
136ba622 505 bool all = false;
f3a1bfb1 506
136ba622
ZS		 507 if (type == NETCONFA_ALL)
508 all = true;
509
510 if (all || type == NETCONFA_FORWARDING)
f3a1bfb1 511 size += nla_total_size(4);
b1afce95 512#ifdef CONFIG_IPV6_MROUTE
136ba622 513 if (all || type == NETCONFA_MC_FORWARDING)
d67b8c61 514 size += nla_total_size(4);
b1afce95 515#endif
136ba622 516 if (all || type == NETCONFA_PROXY_NEIGH)
c92d5491 517 size += nla_total_size(4);
f3a1bfb1 518
136ba622 519 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
35103d11
AG		 520 size += nla_total_size(4);
521
f3a1bfb1
ND		 522 return size;
523}
524
525static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
526 struct ipv6_devconf *devconf, u32 portid,
527 u32 seq, int event, unsigned int flags,
528 int type)
529{
530 struct nlmsghdr *nlh;
531 struct netconfmsg *ncm;
136ba622 532 bool all = false;
f3a1bfb1
ND		 533
534 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
535 flags);
63159f29 536 if (!nlh)
f3a1bfb1
ND		 537 return -EMSGSIZE;
538
136ba622
ZS		 539 if (type == NETCONFA_ALL)
540 all = true;
541
f3a1bfb1
ND		 542 ncm = nlmsg_data(nlh);
543 ncm->ncm_family = AF_INET6;
544
545 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
546 goto nla_put_failure;
547
136ba622 548 if ((all || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 549 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
550 goto nla_put_failure;
b1afce95 551#ifdef CONFIG_IPV6_MROUTE
136ba622 552 if ((all || type == NETCONFA_MC_FORWARDING) &&
d67b8c61
ND		 553 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
554 devconf->mc_forwarding) < 0)
555 goto nla_put_failure;
b1afce95 556#endif
136ba622 557 if ((all || type == NETCONFA_PROXY_NEIGH) &&
c92d5491 558 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
559 goto nla_put_failure;
560
136ba622 561 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
35103d11
AG		 562 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
563 devconf->ignore_routes_with_linkdown) < 0)
564 goto nla_put_failure;
565
053c095a
JB		 566 nlmsg_end(skb, nlh);
567 return 0;
f3a1bfb1
ND		 568
569nla_put_failure:
570 nlmsg_cancel(skb, nlh);
571 return -EMSGSIZE;
572}
573
d67b8c61
ND		 574void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
575 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 576{
577 struct sk_buff *skb;
578 int err = -ENOBUFS;
579
927265bc 580 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
63159f29 581 if (!skb)
f3a1bfb1
ND		 582 goto errout;
583
584 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
585 RTM_NEWNETCONF, 0, type);
586 if (err < 0) {
587 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
588 WARN_ON(err == -EMSGSIZE);
589 kfree_skb(skb);
590 goto errout;
591 }
927265bc 592 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
f3a1bfb1
ND		 593 return;
594errout:
bd779028 595 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 596}
597
76f8f6cb
ND		 598static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
599 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
600 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 601 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
35103d11 602 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
76f8f6cb
ND		 603};
604
605static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 606 struct nlmsghdr *nlh)
76f8f6cb
ND		 607{
608 struct net *net = sock_net(in_skb->sk);
609 struct nlattr *tb[NETCONFA_MAX+1];
610 struct netconfmsg *ncm;
611 struct sk_buff *skb;
612 struct ipv6_devconf *devconf;
613 struct inet6_dev *in6_dev;
614 struct net_device *dev;
615 int ifindex;
616 int err;
617
618 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
619 devconf_ipv6_policy);
620 if (err < 0)
621 goto errout;
622
a97eb33f 623 err = -EINVAL;
76f8f6cb
ND		 624 if (!tb[NETCONFA_IFINDEX])
625 goto errout;
626
627 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
628 switch (ifindex) {
629 case NETCONFA_IFINDEX_ALL:
630 devconf = net->ipv6.devconf_all;
631 break;
632 case NETCONFA_IFINDEX_DEFAULT:
633 devconf = net->ipv6.devconf_dflt;
634 break;
635 default:
636 dev = __dev_get_by_index(net, ifindex);
63159f29 637 if (!dev)
76f8f6cb
ND		 638 goto errout;
639 in6_dev = __in6_dev_get(dev);
63159f29 640 if (!in6_dev)
76f8f6cb
ND		 641 goto errout;
642 devconf = &in6_dev->cnf;
643 break;
644 }
645
646 err = -ENOBUFS;
136ba622 647 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
63159f29 648 if (!skb)
76f8f6cb
ND		 649 goto errout;
650
651 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
652 NETLINK_CB(in_skb).portid,
653 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
136ba622 654 NETCONFA_ALL);
76f8f6cb
ND		 655 if (err < 0) {
656 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
657 WARN_ON(err == -EMSGSIZE);
658 kfree_skb(skb);
659 goto errout;
660 }
661 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
662errout:
663 return err;
664}
665
7a674200
ND		 666static int inet6_netconf_dump_devconf(struct sk_buff *skb,
667 struct netlink_callback *cb)
668{
669 struct net *net = sock_net(skb->sk);
670 int h, s_h;
671 int idx, s_idx;
672 struct net_device *dev;
673 struct inet6_dev *idev;
674 struct hlist_head *head;
675
676 s_h = cb->args[0];
677 s_idx = idx = cb->args[1];
678
679 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
680 idx = 0;
681 head = &net->dev_index_head[h];
682 rcu_read_lock();
63998ac2
ND		 683 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
684 net->dev_base_seq;
7a674200
ND		 685 hlist_for_each_entry_rcu(dev, head, index_hlist) {
686 if (idx < s_idx)
687 goto cont;
688 idev = __in6_dev_get(dev);
689 if (!idev)
690 goto cont;
691
692 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
693 &idev->cnf,
694 NETLINK_CB(cb->skb).portid,
695 cb->nlh->nlmsg_seq,
696 RTM_NEWNETCONF,
697 NLM_F_MULTI,
136ba622 698 NETCONFA_ALL) < 0) {
7a674200
ND		 699 rcu_read_unlock();
700 goto done;
701 }
63998ac2 702 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 703cont:
704 idx++;
705 }
706 rcu_read_unlock();
707 }
708 if (h == NETDEV_HASHENTRIES) {
709 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
710 net->ipv6.devconf_all,
711 NETLINK_CB(cb->skb).portid,
712 cb->nlh->nlmsg_seq,
713 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 714 NETCONFA_ALL) < 0)
7a674200
ND		 715 goto done;
716 else
717 h++;
718 }
719 if (h == NETDEV_HASHENTRIES + 1) {
720 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
721 net->ipv6.devconf_dflt,
722 NETLINK_CB(cb->skb).portid,
723 cb->nlh->nlmsg_seq,
724 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 725 NETCONFA_ALL) < 0)
7a674200
ND		 726 goto done;
727 else
728 h++;
729 }
730done:
731 cb->args[0] = h;
732 cb->args[1] = idx;
733
734 return skb->len;
735}
736
1da177e4
LT		 737#ifdef CONFIG_SYSCTL
738static void dev_forward_change(struct inet6_dev *idev)
739{
740 struct net_device *dev;
741 struct inet6_ifaddr *ifa;
1da177e4
LT		 742
743 if (!idev)
744 return;
745 dev = idev->dev;
0187bdfb
BH		 746 if (idev->cnf.forwarding)
747 dev_disable_lro(dev);
1a940835 748 if (dev->flags & IFF_MULTICAST) {
2c5e8933 749 if (idev->cnf.forwarding) {
f3ee4010 750 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 751 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
752 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
753 } else {
f3ee4010 754 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 755 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
756 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
757 }
1da177e4 758 }
502a2ffd 759
760 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 761 if (ifa->flags&IFA_F_TENTATIVE)
762 continue;
1da177e4
LT		 763 if (idev->cnf.forwarding)
764 addrconf_join_anycast(ifa);
765 else
766 addrconf_leave_anycast(ifa);
767 }
f3a1bfb1
ND		 768 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
769 dev->ifindex, &idev->cnf);
1da177e4
LT		 770}
771
772
e186932b 773static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 774{
775 struct net_device *dev;
776 struct inet6_dev *idev;
777
4acd4945 778 for_each_netdev(net, dev) {
1da177e4
LT		 779 idev = __in6_dev_get(dev);
780 if (idev) {
e186932b
PE		 781 int changed = (!idev->cnf.forwarding) ^ (!newf);
782 idev->cnf.forwarding = newf;
1da177e4
LT		 783 if (changed)
784 dev_forward_change(idev);
785 }
1da177e4 786 }
1da177e4 787}
c8fecf22 788
013d97e9 789static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 790{
bff16c2f 791 struct net *net;
013d97e9
FR		 792 int old;
793
794 if (!rtnl_trylock())
795 return restart_syscall();
bff16c2f
PE		 796
797 net = (struct net *)table->extra2;
013d97e9
FR		 798 old = *p;
799 *p = newf;
b325fddb 800
013d97e9 801 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 802 if ((!newf) ^ (!old))
803 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
804 NETCONFA_IFINDEX_DEFAULT,
805 net->ipv6.devconf_dflt);
013d97e9
FR		 806 rtnl_unlock();
807 return 0;
88af182e 808 }
c8fecf22 809
e186932b 810 if (p == &net->ipv6.devconf_all->forwarding) {
d26c638c
ND		 811 int old_dflt = net->ipv6.devconf_dflt->forwarding;
812
e186932b 813 net->ipv6.devconf_dflt->forwarding = newf;
d26c638c
ND		 814 if ((!newf) ^ (!old_dflt))
815 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
816 NETCONFA_IFINDEX_DEFAULT,
817 net->ipv6.devconf_dflt);
818
e186932b 819 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 820 if ((!newf) ^ (!old))
821 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
822 NETCONFA_IFINDEX_ALL,
823 net->ipv6.devconf_all);
013d97e9 824 } else if ((!newf) ^ (!old))
c8fecf22 825 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 826 rtnl_unlock();
c8fecf22 827
013d97e9 828 if (newf)
7b4da532 829 rt6_purge_dflt_routers(net);
b325fddb 830 return 1;
c8fecf22 831}
35103d11
AG		 832
833static void addrconf_linkdown_change(struct net *net, __s32 newf)
834{
835 struct net_device *dev;
836 struct inet6_dev *idev;
837
838 for_each_netdev(net, dev) {
839 idev = __in6_dev_get(dev);
840 if (idev) {
841 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
842
843 idev->cnf.ignore_routes_with_linkdown = newf;
844 if (changed)
845 inet6_netconf_notify_devconf(dev_net(dev),
846 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
847 dev->ifindex,
848 &idev->cnf);
849 }
850 }
851}
852
853static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
854{
855 struct net *net;
856 int old;
857
858 if (!rtnl_trylock())
859 return restart_syscall();
860
861 net = (struct net *)table->extra2;
862 old = *p;
863 *p = newf;
864
865 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
866 if ((!newf) ^ (!old))
867 inet6_netconf_notify_devconf(net,
868 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
869 NETCONFA_IFINDEX_DEFAULT,
870 net->ipv6.devconf_dflt);
871 rtnl_unlock();
872 return 0;
873 }
874
875 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
876 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
877 addrconf_linkdown_change(net, newf);
878 if ((!newf) ^ (!old))
879 inet6_netconf_notify_devconf(net,
880 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
881 NETCONFA_IFINDEX_ALL,
882 net->ipv6.devconf_all);
883 }
884 rtnl_unlock();
885
886 return 1;
887}
888
1da177e4
LT		 889#endif
890
5c578aed 891/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 892void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
893{
c2e21293 894 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 895
1da177e4 896#ifdef NET_REFCNT_DEBUG
91df42be 897 pr_debug("%s\n", __func__);
1da177e4
LT		 898#endif
899
900 in6_dev_put(ifp->idev);
901
c15b1cca
HFS		 902 if (cancel_delayed_work(&ifp->dad_work))
903 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
904 ifp);
1da177e4 905
e9d3e084 906 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 907 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 908 return;
909 }
94e187c0 910 ip6_rt_put(ifp->rt);
1da177e4 911
e5785985 912 kfree_rcu(ifp, rcu);
1da177e4
LT		 913}
914
e55ffac6
BH		 915static void
916ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
917{
502a2ffd 918 struct list_head *p;
8a6ce0c0 919 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 920
921 /*
922 * Each device address list is sorted in order of scope -
923 * global before linklocal.
924 */
502a2ffd 925 list_for_each(p, &idev->addr_list) {
926 struct inet6_ifaddr *ifa
927 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 928 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 929 break;
930 }
931
b54c9b98 932 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 933}
934
ddbe5032 935static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 936{
ddbe5032 937 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 938}
939
1da177e4
LT		 940/* On success it returns ifp with increased reference count */
941
942static struct inet6_ifaddr *
3f8f5298
JP		 943ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
944 const struct in6_addr *peer_addr, int pfxlen,
8a226b2c 945 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
1da177e4
LT		 946{
947 struct inet6_ifaddr *ifa = NULL;
948 struct rt6_info *rt;
3a88a81d 949 unsigned int hash;
1da177e4 950 int err = 0;
d68b8270
YH		 951 int addr_type = ipv6_addr_type(addr);
952
953 if (addr_type == IPV6_ADDR_ANY ||
954 addr_type & IPV6_ADDR_MULTICAST ||
955 (!(idev->dev->flags & IFF_LOOPBACK) &&
956 addr_type & IPV6_ADDR_LOOPBACK))
957 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 958
8814c4b5 959 rcu_read_lock_bh();
1da177e4
LT		 960 if (idev->dead) {
961 err = -ENODEV; /*XXX*/
962 goto out2;
963 }
964
56d417b1 965 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 966 err = -EACCES;
967 goto out2;
968 }
969
5c578aed 970 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 971
972 /* Ignore adding duplicate addresses on an interface */
c346dca1 973 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ba3542e1 974 ADBG("ipv6_add_addr: already assigned\n");
1da177e4
LT		 975 err = -EEXIST;
976 goto out;
977 }
978
322f74a4 979 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4 980
63159f29 981 if (!ifa) {
ba3542e1 982 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 983 err = -ENOBUFS;
984 goto out;
985 }
986
8f031519 987 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 988 if (IS_ERR(rt)) {
989 err = PTR_ERR(rt);
990 goto out;
991 }
992
bba24896
JP		 993 neigh_parms_data_state_setall(idev->nd_parms);
994
4e3fd7a0 995 ifa->addr = *addr;
3f8f5298
JP		 996 if (peer_addr)
997 ifa->peer_addr = *peer_addr;
1da177e4
LT		 998
999 spin_lock_init(&ifa->lock);
c15b1cca 1000 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 1001 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 1002 ifa->scope = scope;
1003 ifa->prefix_len = pfxlen;
1004 ifa->flags = flags | IFA_F_TENTATIVE;
8a226b2c
JB		 1005 ifa->valid_lft = valid_lft;
1006 ifa->prefered_lft = prefered_lft;
1da177e4 1007 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 1008 ifa->tokenized = false;
1da177e4 1009
57f5f544
KF		 1010 ifa->rt = rt;
1011
1da177e4
LT		 1012 ifa->idev = idev;
1013 in6_dev_hold(idev);
1014 /* For caller */
1015 in6_ifa_hold(ifa);
1016
1017 /* Add to big hash table */
ddbe5032 1018 hash = inet6_addr_hash(addr);
1da177e4 1019
5c578aed 1020 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 1021 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 1022
1023 write_lock(&idev->lock);
1024 /* Add to inet6_dev unicast addr list. */
e55ffac6 1025 ipv6_link_dev_addr(idev, ifa);
1da177e4 1026
1da177e4 1027 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 1028 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 1029 in6_ifa_hold(ifa);
1030 }
1da177e4 1031
1da177e4
LT		 1032 in6_ifa_hold(ifa);
1033 write_unlock(&idev->lock);
1034out2:
8814c4b5 1035 rcu_read_unlock_bh();
1da177e4 1036
fd92833a 1037 if (likely(err == 0))
f88c91dd 1038 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 1039 else {
1040 kfree(ifa);
1041 ifa = ERR_PTR(err);
1042 }
1043
1044 return ifa;
1045out:
5c578aed 1046 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 1047 goto out2;
1048}
1049
5b84efec
TH		 1050enum cleanup_prefix_rt_t {
1051 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1052 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1053 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1054};
1055
1056/*
1057 * Check, whether the prefix for ifp would still need a prefix route
1058 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1059 * constants.
1060 *
1061 * 1) we don't purge prefix if address was not permanent.
1062 * prefix is managed by its own lifetime.
1063 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1064 * 3) if there are no addresses, delete prefix.
1065 * 4) if there are still other permanent address(es),
1066 * corresponding prefix is still permanent.
1067 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1068 * don't purge the prefix, assume user space is managing it.
1069 * 6) otherwise, update prefix lifetime to the
1070 * longest valid lifetime among the corresponding
1071 * addresses on the device.
1072 * Note: subsequent RA will update lifetime.
1073 **/
1074static enum cleanup_prefix_rt_t
1075check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1076{
1077 struct inet6_ifaddr *ifa;
1078 struct inet6_dev *idev = ifp->idev;
1079 unsigned long lifetime;
1080 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1081
1082 *expires = jiffies;
1083
1084 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1085 if (ifa == ifp)
1086 continue;
1087 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1088 ifp->prefix_len))
1089 continue;
1090 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1091 return CLEANUP_PREFIX_RT_NOP;
1092
1093 action = CLEANUP_PREFIX_RT_EXPIRE;
1094
1095 spin_lock(&ifa->lock);
1096
1097 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1098 /*
1099 * Note: Because this address is
1100 * not permanent, lifetime <
1101 * LONG_MAX / HZ here.
1102 */
1103 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1104 *expires = ifa->tstamp + lifetime * HZ;
1105 spin_unlock(&ifa->lock);
1106 }
1107
1108 return action;
1109}
1110
1111static void
1112cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1113{
1114 struct rt6_info *rt;
1115
1116 rt = addrconf_get_prefix_route(&ifp->addr,
1117 ifp->prefix_len,
1118 ifp->idev->dev,
1119 0, RTF_GATEWAY | RTF_DEFAULT);
1120 if (rt) {
1121 if (del_rt)
1122 ip6_del_rt(rt);
1123 else {
1124 if (!(rt->rt6i_flags & RTF_EXPIRES))
1125 rt6_set_expires(rt, expires);
1126 ip6_rt_put(rt);
1127 }
1128 }
1129}
1130
1131
1da177e4
LT		 1132/* This function wants to get referenced ifp and releases it before return */
1133
1134static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1135{
4c5ff6a6 1136 int state;
5b84efec
TH		 1137 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1138 unsigned long expires;
1da177e4 1139
c15b1cca
HFS		 1140 ASSERT_RTNL();
1141
8e8e676d 1142 spin_lock_bh(&ifp->lock);
4c5ff6a6 1143 state = ifp->state;
e9d3e084 1144 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1145 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1146
1147 if (state == INET6_IFADDR_STATE_DEAD)
1148 goto out;
1da177e4 1149
5c578aed 1150 spin_lock_bh(&addrconf_hash_lock);
1151 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1152 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1153
5b84efec 1154 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1155
1da177e4 1156 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1157 list_del(&ifp->tmp_list);
1158 if (ifp->ifpub) {
1159 in6_ifa_put(ifp->ifpub);
1160 ifp->ifpub = NULL;
1da177e4 1161 }
372e6c8f 1162 __in6_ifa_put(ifp);
1da177e4 1163 }
1da177e4 1164
5b84efec
TH		 1165 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1166 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1167
5b84efec
TH		 1168 list_del_init(&ifp->if_list);
1169 __in6_ifa_put(ifp);
1170
1171 write_unlock_bh(&ifp->idev->lock);
1da177e4 1172
c15b1cca 1173 addrconf_del_dad_work(ifp);
b2238566 1174
1da177e4
LT		 1175 ipv6_ifa_notify(RTM_DELADDR, ifp);
1176
f88c91dd 1177 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1178
5b84efec
TH		 1179 if (action != CLEANUP_PREFIX_RT_NOP) {
1180 cleanup_prefix_route(ifp, expires,
1181 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1182 }
1183
c3968a85
DW		 1184 /* clean up prefsrc entries */
1185 rt6_remove_prefsrc(ifp);
4c5ff6a6 1186out:
1da177e4
LT		 1187 in6_ifa_put(ifp);
1188}
1189
1da177e4
LT		 1190static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1191{
1192 struct inet6_dev *idev = ifp->idev;
1193 struct in6_addr addr, *tmpaddr;
76f793e3 1194 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1195 unsigned long regen_advance;
1da177e4
LT		 1196 int tmp_plen;
1197 int ret = 0;
95c385b4 1198 u32 addr_flags;
76f793e3 1199 unsigned long now = jiffies;
76506a98 1200 long max_desync_factor;
7aa8e63f 1201 s32 cnf_temp_preferred_lft;
1da177e4 1202
53bd6749 1203 write_lock_bh(&idev->lock);
1da177e4
LT		 1204 if (ift) {
1205 spin_lock_bh(&ift->lock);
1206 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1207 spin_unlock_bh(&ift->lock);
1208 tmpaddr = &addr;
1209 } else {
1210 tmpaddr = NULL;
1211 }
1212retry:
1213 in6_dev_hold(idev);
1214 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1215 write_unlock_bh(&idev->lock);
f3213831 1216 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1217 in6_dev_put(idev);
1218 ret = -1;
1219 goto out;
1220 }
1221 spin_lock_bh(&ifp->lock);
1222 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1223 idev->cnf.use_tempaddr = -1; /*XXX*/
1224 spin_unlock_bh(&ifp->lock);
53bd6749 1225 write_unlock_bh(&idev->lock);
f3213831
JP		 1226 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1227 __func__);
1da177e4
LT		 1228 in6_dev_put(idev);
1229 ret = -1;
1230 goto out;
1231 }
1232 in6_ifa_hold(ifp);
1233 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
9d6280da 1234 ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1235 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1236 age = (now - ifp->tstamp) / HZ;
76506a98
JB		 1237
1238 regen_advance = idev->cnf.regen_max_retry *
1239 idev->cnf.dad_transmits *
1240 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1241
1242 /* recalculate max_desync_factor each time and update
1243 * idev->desync_factor if it's larger
1244 */
7aa8e63f 1245 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
76506a98
JB		 1246 max_desync_factor = min_t(__u32,
1247 idev->cnf.max_desync_factor,
7aa8e63f 1248 cnf_temp_preferred_lft - regen_advance);
76506a98
JB		 1249
1250 if (unlikely(idev->desync_factor > max_desync_factor)) {
1251 if (max_desync_factor > 0) {
1252 get_random_bytes(&idev->desync_factor,
1253 sizeof(idev->desync_factor));
1254 idev->desync_factor %= max_desync_factor;
1255 } else {
1256 idev->desync_factor = 0;
1257 }
1258 }
1259
1da177e4
LT		 1260 tmp_valid_lft = min_t(__u32,
1261 ifp->valid_lft,
7a876b0e 1262 idev->cnf.temp_valid_lft + age);
7aa8e63f 1263 tmp_prefered_lft = cnf_temp_preferred_lft + age -
76506a98 1264 idev->desync_factor;
76506a98 1265 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1da177e4 1266 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1267 tmp_tstamp = ifp->tstamp;
1268 spin_unlock_bh(&ifp->lock);
1269
53bd6749 1270 write_unlock_bh(&idev->lock);
95c385b4 1271
eac55bf9
BB		 1272 /* A temporary address is created only if this calculated Preferred
1273 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1274 * an implementation must not create a temporary address with a zero
1275 * Preferred Lifetime.
ecab6701
HK		 1276 * Use age calculation as in addrconf_verify to avoid unnecessary
1277 * temporary addresses being generated.
eac55bf9 1278 */
ecab6701
HK		 1279 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1280 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1281 in6_ifa_put(ifp);
1282 in6_dev_put(idev);
1283 ret = -1;
1284 goto out;
1285 }
1286
95c385b4
NH		 1287 addr_flags = IFA_F_TEMPORARY;
1288 /* set in addrconf_prefix_rcv() */
1289 if (ifp->flags & IFA_F_OPTIMISTIC)
1290 addr_flags |= IFA_F_OPTIMISTIC;
1291
4b08a8f1
HFS		 1292 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1293 ipv6_addr_scope(&addr), addr_flags,
1294 tmp_valid_lft, tmp_prefered_lft);
1295 if (IS_ERR(ift)) {
1da177e4
LT		 1296 in6_ifa_put(ifp);
1297 in6_dev_put(idev);
f3213831 1298 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1299 tmpaddr = &addr;
53bd6749 1300 write_lock_bh(&idev->lock);
1da177e4
LT		 1301 goto retry;
1302 }
1303
1304 spin_lock_bh(&ift->lock);
1305 ift->ifpub = ifp;
76f793e3 1306 ift->cstamp = now;
1da177e4
LT		 1307 ift->tstamp = tmp_tstamp;
1308 spin_unlock_bh(&ift->lock);
1309
cf22f9a2 1310 addrconf_dad_start(ift);
1da177e4
LT		 1311 in6_ifa_put(ift);
1312 in6_dev_put(idev);
1313out:
1314 return ret;
1315}
1da177e4
LT		 1316
1317/*
072047e4 1318 * Choose an appropriate source address (RFC3484)
1da177e4 1319 */
a9b05723
YH		 1320enum {
1321 IPV6_SADDR_RULE_INIT = 0,
1322 IPV6_SADDR_RULE_LOCAL,
1323 IPV6_SADDR_RULE_SCOPE,
1324 IPV6_SADDR_RULE_PREFERRED,
1325#ifdef CONFIG_IPV6_MIP6
1326 IPV6_SADDR_RULE_HOA,
1327#endif
1328 IPV6_SADDR_RULE_OIF,
1329 IPV6_SADDR_RULE_LABEL,
a9b05723 1330 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1331 IPV6_SADDR_RULE_ORCHID,
1332 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1333#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1334 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1335#endif
a9b05723
YH		 1336 IPV6_SADDR_RULE_MAX
1337};
1338
072047e4 1339struct ipv6_saddr_score {
a9b05723
YH		 1340 int rule;
1341 int addr_type;
1342 struct inet6_ifaddr *ifa;
1343 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1344 int scopedist;
1345 int matchlen;
072047e4
YH		 1346};
1347
a9b05723 1348struct ipv6_saddr_dst {
9acd9f3a 1349 const struct in6_addr *addr;
a9b05723
YH		 1350 int ifindex;
1351 int scope;
1352 int label;
7cbca67c 1353 unsigned int prefs;
a9b05723 1354};
072047e4 1355
b6f99a21 1356static inline int ipv6_saddr_preferred(int type)
1da177e4 1357{
45bb0060 1358 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1359 return 1;
1360 return 0;
1da177e4
LT		 1361}
1362
7fd2561e
EK		 1363static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1364{
1365#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1366 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1367#else
1368 return false;
1369#endif
1370}
1371
3de23255
BT		 1372static int ipv6_get_saddr_eval(struct net *net,
1373 struct ipv6_saddr_score *score,
a9b05723
YH		 1374 struct ipv6_saddr_dst *dst,
1375 int i)
1376{
1377 int ret;
1378
1379 if (i <= score->rule) {
1380 switch (i) {
1381 case IPV6_SADDR_RULE_SCOPE:
1382 ret = score->scopedist;
1383 break;
1384 case IPV6_SADDR_RULE_PREFIX:
1385 ret = score->matchlen;
1386 break;
1387 default:
1388 ret = !!test_bit(i, score->scorebits);
1389 }
1390 goto out;
1391 }
1392
1393 switch (i) {
1394 case IPV6_SADDR_RULE_INIT:
1395 /* Rule 0: remember if hiscore is not ready yet */
1396 ret = !!score->ifa;
1397 break;
1398 case IPV6_SADDR_RULE_LOCAL:
1399 /* Rule 1: Prefer same address */
1400 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1401 break;
1402 case IPV6_SADDR_RULE_SCOPE:
1403 /* Rule 2: Prefer appropriate scope
1404 *
1405 * ret
1406 * ^
1407 * -1 | d 15
1408 * ---+--+-+---> scope
1409 * |
1410 * | d is scope of the destination.
1411 * B-d | \
1412 * | \ <- smaller scope is better if
db9c7c39 1413 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1414 * | ret = B - scope (-1 <= scope >= d <= 15).
1415 * d-C-1 | /
1416 * |/ <- greater is better
1417 * -C / if scope is not enough for destination.
1418 * /| ret = scope - C (-1 <= d < scope <= 15).
1419 *
1420 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1421 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1422 * Assume B = 0 and we get C > 29.
1423 */
1424 ret = __ipv6_addr_src_scope(score->addr_type);
1425 if (ret >= dst->scope)
1426 ret = -ret;
1427 else
1428 ret -= 128; /* 30 is enough */
1429 score->scopedist = ret;
1430 break;
1431 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1432 {
a9b05723 1433 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1434 u8 avoid = IFA_F_DEPRECATED;
1435
1436 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1437 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1438 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1439 !(score->ifa->flags & avoid);
a9b05723 1440 break;
7fd2561e 1441 }
a9b05723
YH		 1442#ifdef CONFIG_IPV6_MIP6
1443 case IPV6_SADDR_RULE_HOA:
7cbca67c 1444 {
a9b05723 1445 /* Rule 4: Prefer home address */
7cbca67c
YH		 1446 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1447 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1448 break;
7cbca67c 1449 }
a9b05723
YH		 1450#endif
1451 case IPV6_SADDR_RULE_OIF:
1452 /* Rule 5: Prefer outgoing interface */
1453 ret = (!dst->ifindex ||
1454 dst->ifindex == score->ifa->idev->dev->ifindex);
1455 break;
1456 case IPV6_SADDR_RULE_LABEL:
1457 /* Rule 6: Prefer matching label */
3de23255
BT		 1458 ret = ipv6_addr_label(net,
1459 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1460 score->ifa->idev->dev->ifindex) == dst->label;
1461 break;
a9b05723 1462 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1463 {
a9b05723 1464 /* Rule 7: Prefer public address
25985edc 1465 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1466 */
7cbca67c
YH		 1467 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1468 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1469 score->ifa->idev->cnf.use_tempaddr >= 2;
1470 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1471 break;
7cbca67c 1472 }
a9b05723
YH		 1473 case IPV6_SADDR_RULE_ORCHID:
1474 /* Rule 8-: Prefer ORCHID vs ORCHID or
1475 * non-ORCHID vs non-ORCHID
1476 */
1477 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1478 ipv6_addr_orchid(dst->addr));
1479 break;
1480 case IPV6_SADDR_RULE_PREFIX:
1481 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1482 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1483 if (ret > score->ifa->prefix_len)
1484 ret = score->ifa->prefix_len;
1485 score->matchlen = ret;
a9b05723 1486 break;
7fd2561e
EK		 1487#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1488 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1489 /* Optimistic addresses still have lower precedence than other
1490 * preferred addresses.
1491 */
1492 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1493 break;
1494#endif
a9b05723
YH		 1495 default:
1496 ret = 0;
1497 }
1498
1499 if (ret)
1500 __set_bit(i, score->scorebits);
1501 score->rule = i;
1502out:
1503 return ret;
1504}
1505
c0b8da1e
YH		 1506static int __ipv6_dev_get_saddr(struct net *net,
1507 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1508 struct inet6_dev *idev,
1509 struct ipv6_saddr_score *scores,
1510 int hiscore_idx)
9131f3de 1511{
c0b8da1e 1512 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de
YH		 1513
1514 read_lock_bh(&idev->lock);
1515 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1516 int i;
1517
1518 /*
1519 * - Tentative Address (RFC2462 section 5.4)
1520 * - A tentative address is not considered
1521 * "assigned to an interface" in the traditional
1522 * sense, unless it is also flagged as optimistic.
1523 * - Candidate Source Address (section 4)
1524 * - In any case, anycast addresses, multicast
1525 * addresses, and the unspecified address MUST
1526 * NOT be included in a candidate set.
1527 */
1528 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1529 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1530 continue;
1531
1532 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1533
1534 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1535 score->addr_type & IPV6_ADDR_MULTICAST)) {
1536 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1537 idev->dev->name);
1538 continue;
1539 }
1540
1541 score->rule = -1;
1542 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1543
1544 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1545 int minihiscore, miniscore;
1546
1547 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1548 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1549
1550 if (minihiscore > miniscore) {
1551 if (i == IPV6_SADDR_RULE_SCOPE &&
1552 score->scopedist > 0) {
1553 /*
1554 * special case:
1555 * each remaining entry
1556 * has too small (not enough)
1557 * scope, because ifa entries
1558 * are sorted by their scope
1559 * values.
1560 */
1561 goto out;
1562 }
1563 break;
1564 } else if (minihiscore < miniscore) {
1565 if (hiscore->ifa)
1566 in6_ifa_put(hiscore->ifa);
1567
1568 in6_ifa_hold(score->ifa);
1569
1570 swap(hiscore, score);
c0b8da1e 1571 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1572
1573 /* restore our iterator */
1574 score->ifa = hiscore->ifa;
1575
1576 break;
1577 }
1578 }
1579 }
1580out:
1581 read_unlock_bh(&idev->lock);
c0b8da1e 1582 return hiscore_idx;
9131f3de
YH		 1583}
1584
afbac601
DA		 1585static int ipv6_get_saddr_master(struct net *net,
1586 const struct net_device *dst_dev,
1587 const struct net_device *master,
1588 struct ipv6_saddr_dst *dst,
1589 struct ipv6_saddr_score *scores,
1590 int hiscore_idx)
1591{
1592 struct inet6_dev *idev;
1593
1594 idev = __in6_dev_get(dst_dev);
1595 if (idev)
1596 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1597 scores, hiscore_idx);
1598
1599 idev = __in6_dev_get(master);
1600 if (idev)
1601 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1602 scores, hiscore_idx);
1603
1604 return hiscore_idx;
1605}
1606
b3f644fc 1607int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1608 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1609 struct in6_addr *saddr)
1da177e4 1610{
c0b8da1e 1611 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1612 struct ipv6_saddr_dst dst;
9131f3de 1613 struct inet6_dev *idev;
072047e4 1614 struct net_device *dev;
a9b05723 1615 int dst_type;
9131f3de 1616 bool use_oif_addr = false;
c0b8da1e 1617 int hiscore_idx = 0;
1da177e4 1618
a9b05723
YH		 1619 dst_type = __ipv6_addr_type(daddr);
1620 dst.addr = daddr;
1621 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1622 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1623 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1624 dst.prefs = prefs;
a9b05723 1625
c0b8da1e
YH		 1626 scores[hiscore_idx].rule = -1;
1627 scores[hiscore_idx].ifa = NULL;
1da177e4 1628
8814c4b5 1629 rcu_read_lock();
1da177e4 1630
9131f3de
YH		 1631 /* Candidate Source Address (section 4)
1632 * - multicast and link-local destination address,
1633 * the set of candidate source address MUST only
1634 * include addresses assigned to interfaces
1635 * belonging to the same link as the outgoing
1636 * interface.
1637 * (- For site-local destination addresses, the
1638 * set of candidate source addresses MUST only
1639 * include addresses assigned to interfaces
1640 * belonging to the same site as the outgoing
1641 * interface.)
3985e8a3
EK		 1642 * - "It is RECOMMENDED that the candidate source addresses
1643 * be the set of unicast addresses assigned to the
1644 * interface that will be used to send to the destination
1645 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1646 */
1647 if (dst_dev) {
3985e8a3 1648 idev = __in6_dev_get(dst_dev);
9131f3de 1649 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1650 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1651 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1652 use_oif_addr = true;
1653 }
1654 }
a9b05723 1655
9131f3de 1656 if (use_oif_addr) {
c0b8da1e 1657 if (idev)
c15df306 1658 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de 1659 } else {
afbac601
DA		 1660 const struct net_device *master;
1661 int master_idx = 0;
1662
1663 /* if dst_dev exists and is enslaved to an L3 device, then
1664 * prefer addresses from dst_dev and then the master over
1665 * any other enslaved devices in the L3 domain.
1666 */
1667 master = l3mdev_master_dev_rcu(dst_dev);
1668 if (master) {
1669 master_idx = master->ifindex;
1670
1671 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1672 master, &dst,
1673 scores, hiscore_idx);
1674
1675 if (scores[hiscore_idx].ifa)
1676 goto out;
1677 }
1678
9131f3de 1679 for_each_netdev_rcu(net, dev) {
afbac601
DA		 1680 /* only consider addresses on devices in the
1681 * same L3 domain
1682 */
1683 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1684 continue;
9131f3de
YH		 1685 idev = __in6_dev_get(dev);
1686 if (!idev)
072047e4 1687 continue;
c15df306 1688 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1689 }
1690 }
afbac601
DA		 1691
1692out:
8814c4b5 1693 rcu_read_unlock();
1da177e4 1694
c0b8da1e 1695 hiscore = &scores[hiscore_idx];
a9b05723 1696 if (!hiscore->ifa)
072047e4 1697 return -EADDRNOTAVAIL;
1ab1457c 1698
4e3fd7a0 1699 *saddr = hiscore->ifa->addr;
a9b05723 1700 in6_ifa_put(hiscore->ifa);
072047e4 1701 return 0;
1da177e4 1702}
5e5f3f0f 1703EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1704
8965779d 1705int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1706 u32 banned_flags)
b7b1bfce
HFS		 1707{
1708 struct inet6_ifaddr *ifp;
1709 int err = -EADDRNOTAVAIL;
1710
602582ca
HFS		 1711 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1712 if (ifp->scope > IFA_LINK)
1713 break;
b7b1bfce
HFS		 1714 if (ifp->scope == IFA_LINK &&
1715 !(ifp->flags & banned_flags)) {
1716 *addr = ifp->addr;
1717 err = 0;
1718 break;
1719 }
1720 }
1721 return err;
1722}
1723
95c385b4 1724int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1725 u32 banned_flags)
1da177e4
LT		 1726{
1727 struct inet6_dev *idev;
1728 int err = -EADDRNOTAVAIL;
1729
8814c4b5 1730 rcu_read_lock();
e21e8467
SH		 1731 idev = __in6_dev_get(dev);
1732 if (idev) {
1da177e4 1733 read_lock_bh(&idev->lock);
b7b1bfce 1734 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1735 read_unlock_bh(&idev->lock);
1736 }
8814c4b5 1737 rcu_read_unlock();
1da177e4
LT		 1738 return err;
1739}
1740
1741static int ipv6_count_addresses(struct inet6_dev *idev)
1742{
1743 int cnt = 0;
1744 struct inet6_ifaddr *ifp;
1745
1746 read_lock_bh(&idev->lock);
502a2ffd 1747 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1748 cnt++;
1749 read_unlock_bh(&idev->lock);
1750 return cnt;
1751}
1752
b71d1d42 1753int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1754 const struct net_device *dev, int strict)
c58da4c6
EK		 1755{
1756 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1757}
1758EXPORT_SYMBOL(ipv6_chk_addr);
1759
1760int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1761 const struct net_device *dev, int strict,
1762 u32 banned_flags)
1da177e4 1763{
eedf042a 1764 struct inet6_ifaddr *ifp;
ddbe5032 1765 unsigned int hash = inet6_addr_hash(addr);
c58da4c6 1766 u32 ifp_flags;
1da177e4 1767
5c578aed 1768 rcu_read_lock_bh();
b67bfe0d 1769 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1770 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1771 continue;
c58da4c6
EK		 1772 /* Decouple optimistic from tentative for evaluation here.
1773 * Ban optimistic addresses explicitly, when required.
1774 */
1775 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1776 ? (ifp->flags&~IFA_F_TENTATIVE)
1777 : ifp->flags;
1da177e4 1778 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1779 !(ifp_flags&banned_flags) &&
63159f29 1780 (!dev || ifp->idev->dev == dev ||
eedf042a
SH		 1781 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1782 rcu_read_unlock_bh();
1783 return 1;
1da177e4
LT		 1784 }
1785 }
5c578aed 1786
eedf042a
SH		 1787 rcu_read_unlock_bh();
1788 return 0;
1da177e4 1789}
c58da4c6 1790EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1791
3e81c6da
DM		 1792static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1793 struct net_device *dev)
1da177e4 1794{
ddbe5032 1795 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1796 struct inet6_ifaddr *ifp;
1da177e4 1797
b67bfe0d 1798 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1799 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1800 continue;
1da177e4 1801 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1802 if (!dev || ifp->idev->dev == dev)
3e81c6da 1803 return true;
1da177e4
LT		 1804 }
1805 }
3e81c6da 1806 return false;
1da177e4
LT		 1807}
1808
7df37ff3
CB		 1809/* Compares an address/prefix_len with addresses on device @dev.
1810 * If one is found it returns true.
1811 */
1812bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1813 const unsigned int prefix_len, struct net_device *dev)
1814{
1815 struct inet6_dev *idev;
1816 struct inet6_ifaddr *ifa;
1817 bool ret = false;
1818
1819 rcu_read_lock();
1820 idev = __in6_dev_get(dev);
1821 if (idev) {
1822 read_lock_bh(&idev->lock);
1823 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1824 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1825 if (ret)
1826 break;
1827 }
1828 read_unlock_bh(&idev->lock);
1829 }
1830 rcu_read_unlock();
1831
1832 return ret;
1833}
1834EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1835
b71d1d42 1836int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1837{
1838 struct inet6_dev *idev;
1839 struct inet6_ifaddr *ifa;
1840 int onlink;
1841
1842 onlink = 0;
1843 rcu_read_lock();
1844 idev = __in6_dev_get(dev);
1845 if (idev) {
1846 read_lock_bh(&idev->lock);
502a2ffd 1847 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1848 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1849 ifa->prefix_len);
1850 if (onlink)
1851 break;
1852 }
1853 read_unlock_bh(&idev->lock);
1854 }
1855 rcu_read_unlock();
1856 return onlink;
1857}
52eeeb84
YH		 1858EXPORT_SYMBOL(ipv6_chk_prefix);
1859
9acd9f3a 1860struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1861 struct net_device *dev, int strict)
1da177e4 1862{
b79d1d54 1863 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1864 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1865
5c578aed 1866 rcu_read_lock_bh();
b67bfe0d 1867 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1868 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1869 continue;
1da177e4 1870 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1871 if (!dev || ifp->idev->dev == dev ||
1da177e4 1872 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1873 result = ifp;
1da177e4
LT		 1874 in6_ifa_hold(ifp);
1875 break;
1876 }
1877 }
1878 }
5c578aed 1879 rcu_read_unlock_bh();
1da177e4 1880
b79d1d54 1881 return result;
1da177e4
LT		 1882}
1883
1da177e4
LT		 1884/* Gets referenced address, destroys ifaddr */
1885
cc411d0b 1886static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1887{
3d171f39
LR		 1888 if (dad_failed)
1889 ifp->flags |= IFA_F_DADFAILED;
1890
1da177e4
LT		 1891 if (ifp->flags&IFA_F_PERMANENT) {
1892 spin_lock_bh(&ifp->lock);
c15b1cca 1893 addrconf_del_dad_work(ifp);
1da177e4
LT		 1894 ifp->flags |= IFA_F_TENTATIVE;
1895 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1896 if (dad_failed)
1897 ipv6_ifa_notify(0, ifp);
1da177e4 1898 in6_ifa_put(ifp);
1da177e4
LT		 1899 } else if (ifp->flags&IFA_F_TEMPORARY) {
1900 struct inet6_ifaddr *ifpub;
1901 spin_lock_bh(&ifp->lock);
1902 ifpub = ifp->ifpub;
1903 if (ifpub) {
1904 in6_ifa_hold(ifpub);
1905 spin_unlock_bh(&ifp->lock);
1906 ipv6_create_tempaddr(ifpub, ifp);
1907 in6_ifa_put(ifpub);
1908 } else {
1909 spin_unlock_bh(&ifp->lock);
1910 }
1911 ipv6_del_addr(ifp);
c15b1cca 1912 } else {
1da177e4 1913 ipv6_del_addr(ifp);
c15b1cca 1914 }
1da177e4
LT		 1915}
1916
f2344a13
HX		 1917static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1918{
1919 int err = -ENOENT;
1920
8e8e676d 1921 spin_lock_bh(&ifp->lock);
f2344a13
HX		 1922 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1923 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1924 err = 0;
1925 }
8e8e676d 1926 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 1927
1928 return err;
1929}
1930
3c21edbd
YH		 1931void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1932{
1b34be74 1933 struct inet6_dev *idev = ifp->idev;
1855b7c3 1934 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 1935
853dc2e0
UB		 1936 if (addrconf_dad_end(ifp)) {
1937 in6_ifa_put(ifp);
f2344a13 1938 return;
853dc2e0 1939 }
f2344a13 1940
e87cc472
JP		 1941 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1942 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1943
5f40ef77
HFS		 1944 spin_lock_bh(&ifp->lock);
1945
1946 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1947 int scope = ifp->scope;
1948 u32 flags = ifp->flags;
1949 struct in6_addr new_addr;
1950 struct inet6_ifaddr *ifp2;
1951 u32 valid_lft, preferred_lft;
1952 int pfxlen = ifp->prefix_len;
5f40ef77
HFS		 1953 int retries = ifp->stable_privacy_retry + 1;
1954
1855b7c3 1955 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 1956 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1957 ifp->idev->dev->name);
1958 goto errdad;
1959 }
1960
1961 new_addr = ifp->addr;
1962 if (ipv6_generate_stable_address(&new_addr, retries,
1963 idev))
1964 goto errdad;
1965
1966 valid_lft = ifp->valid_lft;
1967 preferred_lft = ifp->prefered_lft;
1968
1969 spin_unlock_bh(&ifp->lock);
1b34be74 1970
5f40ef77
HFS		 1971 if (idev->cnf.max_addresses &&
1972 ipv6_count_addresses(idev) >=
1973 idev->cnf.max_addresses)
1974 goto lock_errdad;
1975
1976 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1977 ifp->idev->dev->name);
1978
1979 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1980 scope, flags, valid_lft,
1981 preferred_lft);
1982 if (IS_ERR(ifp2))
1983 goto lock_errdad;
1984
1985 spin_lock_bh(&ifp2->lock);
1986 ifp2->stable_privacy_retry = retries;
1987 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1988 spin_unlock_bh(&ifp2->lock);
1989
1855b7c3 1990 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 1991 in6_ifa_put(ifp2);
1992lock_errdad:
1993 spin_lock_bh(&ifp->lock);
1b34be74
YH		 1994 }
1995
5f40ef77 1996errdad:
c15b1cca
HFS		 1997 /* transition from _POSTDAD to _ERRDAD */
1998 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 1999 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 2000
2001 addrconf_mod_dad_work(ifp, 0);
751eb6b6 2002 in6_ifa_put(ifp);
3c21edbd 2003}
1da177e4 2004
a9ed4a29
SD		 2005/* Join to solicited addr multicast group.
2006 * caller must hold RTNL */
b71d1d42 2007void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 2008{
2009 struct in6_addr maddr;
2010
2011 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2012 return;
2013
2014 addrconf_addr_solict_mult(addr, &maddr);
2015 ipv6_dev_mc_inc(dev, &maddr);
2016}
2017
a9ed4a29 2018/* caller must hold RTNL */
b71d1d42 2019void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 2020{
2021 struct in6_addr maddr;
2022
2023 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2024 return;
2025
2026 addrconf_addr_solict_mult(addr, &maddr);
2027 __ipv6_dev_mc_dec(idev, &maddr);
2028}
2029
a9ed4a29 2030/* caller must hold RTNL */
20380731 2031static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2032{
2033 struct in6_addr addr;
c15b1cca 2034
88ad3149 2035 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 2036 return;
1da177e4
LT		 2037 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2038 if (ipv6_addr_any(&addr))
2039 return;
013b4d90 2040 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 2041}
2042
a9ed4a29 2043/* caller must hold RTNL */
20380731 2044static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2045{
2046 struct in6_addr addr;
c15b1cca 2047
88ad3149 2048 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 2049 return;
1da177e4
LT		 2050 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2051 if (ipv6_addr_any(&addr))
2052 return;
2053 __ipv6_dev_ac_dec(ifp->idev, &addr);
2054}
2055
06a4c1c5 2056static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
2057{
5241c2d7 2058 if (dev->addr_len != EUI64_ADDR_LEN)
06a4c1c5 2059 return -1;
5241c2d7 2060 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
5e98a36e 2061 eui[0] ^= 2;
06a4c1c5 2062 return 0;
2063}
2064
cb6bf355
YH		 2065static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2066{
2067 union fwnet_hwaddr *ha;
2068
2069 if (dev->addr_len != FWNET_ALEN)
2070 return -1;
2071
2072 ha = (union fwnet_hwaddr *)dev->dev_addr;
2073
2074 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2075 eui[0] ^= 2;
2076 return 0;
2077}
2078
073a8e0e
YH		 2079static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2080{
2081 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2082 if (dev->addr_len != ARCNET_ALEN)
2083 return -1;
2084 memset(eui, 0, 7);
8e5e8f30 2085 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 2086 return 0;
2087}
2088
2089static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2090{
2091 if (dev->addr_len != INFINIBAND_ALEN)
2092 return -1;
2093 memcpy(eui, dev->dev_addr + 12, 8);
2094 eui[0] |= 2;
2095 return 0;
2096}
2097
c61393ea 2098static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2099{
9af28511
SH		 2100 if (addr == 0)
2101 return -1;
dfd982ba
YH		 2102 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2103 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2104 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2105 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2106 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2107 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2108 eui[1] = 0;
2109 eui[2] = 0x5E;
2110 eui[3] = 0xFE;
2111 memcpy(eui + 4, &addr, 4);
2112 return 0;
2113}
dfd982ba
YH		 2114
2115static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2116{
2117 if (dev->priv_flags & IFF_ISATAP)
2118 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2119 return -1;
2120}
2121
aee80b54 2122static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2123{
2124 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2125}
2126
e837735e
ND		 2127static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2128{
2129 memcpy(eui, dev->perm_addr, 3);
2130 memcpy(eui + 5, dev->perm_addr + 3, 3);
2131 eui[3] = 0xFF;
2132 eui[4] = 0xFE;
2133 eui[0] ^= 2;
2134 return 0;
2135}
2136
1da177e4
LT		 2137static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2138{
2139 switch (dev->type) {
2140 case ARPHRD_ETHER:
2141 case ARPHRD_FDDI:
073a8e0e 2142 return addrconf_ifid_eui48(eui, dev);
1da177e4 2143 case ARPHRD_ARCNET:
073a8e0e 2144 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2145 case ARPHRD_INFINIBAND:
073a8e0e 2146 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2147 case ARPHRD_SIT:
dfd982ba 2148 return addrconf_ifid_sit(eui, dev);
aee80b54 2149 case ARPHRD_IPGRE:
45ce0fd1 2150 case ARPHRD_TUNNEL:
aee80b54 2151 return addrconf_ifid_gre(eui, dev);
e74bccb8 2152 case ARPHRD_6LOWPAN:
06a4c1c5 2153 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 2154 case ARPHRD_IEEE1394:
2155 return addrconf_ifid_ieee1394(eui, dev);
e837735e 2156 case ARPHRD_TUNNEL6:
45ce0fd1 2157 case ARPHRD_IP6GRE:
e837735e 2158 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2159 }
2160 return -1;
2161}
2162
2163static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2164{
2165 int err = -1;
2166 struct inet6_ifaddr *ifp;
2167
2168 read_lock_bh(&idev->lock);
602582ca
HFS		 2169 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2170 if (ifp->scope > IFA_LINK)
2171 break;
1da177e4
LT		 2172 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2173 memcpy(eui, ifp->addr.s6_addr+8, 8);
2174 err = 0;
2175 break;
2176 }
2177 }
2178 read_unlock_bh(&idev->lock);
2179 return err;
2180}
2181
1da177e4 2182/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
9d6280da 2183static void ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2184{
1da177e4 2185regen:
955189ef 2186 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2187 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2188
2189 /*
2190 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2191 * check if generated address is not inappropriate
2192 *
2193 * - Reserved subnet anycast (RFC 2526)
2194 * 11111101 11....11 1xxxxxxx
c7dc89c0 2195 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2196 * 00-00-5E-FE-xx-xx-xx-xx
2197 * - value 0
2198 * - XXX: already assigned to an address on the device
2199 */
1ab1457c 2200 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2201 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2202 (idev->rndid[7]&0x80))
2203 goto regen;
2204 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2205 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2206 goto regen;
2207 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2208 goto regen;
2209 }
1da177e4
LT		 2210}
2211
9d6280da 2212static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2213{
1da177e4 2214 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
9d6280da 2215 ipv6_regen_rndid(idev);
1da177e4 2216}
1da177e4
LT		 2217
2218/*
2219 * Add prefix route.
2220 */
2221
2222static void
2223addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2224 unsigned long expires, u32 flags)
1da177e4 2225{
86872cb5 2226 struct fib6_config cfg = {
ca254490 2227 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
86872cb5
TG		 2228 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2229 .fc_ifindex = dev->ifindex,
2230 .fc_expires = expires,
2231 .fc_dst_len = plen,
2232 .fc_flags = RTF_UP | flags,
c346dca1 2233 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2234 .fc_protocol = RTPROT_KERNEL,
86872cb5 2235 };
1da177e4 2236
4e3fd7a0 2237 cfg.fc_dst = *pfx;
1da177e4
LT		 2238
2239 /* Prevent useless cloning on PtP SIT.
2240 This thing is done here expecting that the whole
2241 class of non-broadcast devices need not cloning.
2242 */
07a93626 2243#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2244 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2245 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2246#endif
1da177e4 2247
86872cb5 2248 ip6_route_add(&cfg);
1da177e4
LT		 2249}
2250
14ef37b6
AH		 2251
2252static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2253 int plen,
2254 const struct net_device *dev,
2255 u32 flags, u32 noflags)
2256{
2257 struct fib6_node *fn;
2258 struct rt6_info *rt = NULL;
2259 struct fib6_table *table;
ca254490 2260 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2261
ca254490 2262 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2263 if (!table)
14ef37b6
AH		 2264 return NULL;
2265
5744dd9b 2266 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2267 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2268 if (!fn)
2269 goto out;
1f56a01f
MKL		 2270
2271 noflags |= RTF_CACHE;
14ef37b6 2272 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2273 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2274 continue;
2275 if ((rt->rt6i_flags & flags) != flags)
2276 continue;
85da53bf 2277 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2278 continue;
2279 dst_hold(&rt->dst);
2280 break;
2281 }
2282out:
5744dd9b 2283 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2284 return rt;
2285}
2286
2287
1da177e4
LT		 2288/* Create "default" multicast route to the interface */
2289
2290static void addrconf_add_mroute(struct net_device *dev)
2291{
86872cb5 2292 struct fib6_config cfg = {
ca254490 2293 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2294 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2295 .fc_ifindex = dev->ifindex,
2296 .fc_dst_len = 8,
2297 .fc_flags = RTF_UP,
c346dca1 2298 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2299 };
2300
2301 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2302
2303 ip6_route_add(&cfg);
1da177e4
LT		 2304}
2305
1da177e4
LT		 2306static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2307{
2308 struct inet6_dev *idev;
2309
2310 ASSERT_RTNL();
2311
e21e8467
SH		 2312 idev = ipv6_find_idev(dev);
2313 if (!idev)
64e724f6
BH		 2314 return ERR_PTR(-ENOBUFS);
2315
2316 if (idev->cnf.disable_ipv6)
2317 return ERR_PTR(-EACCES);
1da177e4
LT		 2318
2319 /* Add default multicast route */
ba46ee4c 2320 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
4af04aba 2321 addrconf_add_mroute(dev);
1da177e4 2322
1da177e4
LT		 2323 return idev;
2324}
2325
53bd6749
JP		 2326static void manage_tempaddrs(struct inet6_dev *idev,
2327 struct inet6_ifaddr *ifp,
2328 __u32 valid_lft, __u32 prefered_lft,
2329 bool create, unsigned long now)
2330{
2331 u32 flags;
2332 struct inet6_ifaddr *ift;
2333
2334 read_lock_bh(&idev->lock);
2335 /* update all temporary addresses in the list */
2336 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2337 int age, max_valid, max_prefered;
2338
2339 if (ifp != ift->ifpub)
2340 continue;
2341
2342 /* RFC 4941 section 3.3:
2343 * If a received option will extend the lifetime of a public
2344 * address, the lifetimes of temporary addresses should
2345 * be extended, subject to the overall constraint that no
2346 * temporary addresses should ever remain "valid" or "preferred"
2347 * for a time longer than (TEMP_VALID_LIFETIME) or
2348 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2349 */
2350 age = (now - ift->cstamp) / HZ;
2351 max_valid = idev->cnf.temp_valid_lft - age;
2352 if (max_valid < 0)
2353 max_valid = 0;
2354
2355 max_prefered = idev->cnf.temp_prefered_lft -
76506a98 2356 idev->desync_factor - age;
53bd6749
JP		 2357 if (max_prefered < 0)
2358 max_prefered = 0;
2359
2360 if (valid_lft > max_valid)
2361 valid_lft = max_valid;
2362
2363 if (prefered_lft > max_prefered)
2364 prefered_lft = max_prefered;
2365
2366 spin_lock(&ift->lock);
2367 flags = ift->flags;
2368 ift->valid_lft = valid_lft;
2369 ift->prefered_lft = prefered_lft;
2370 ift->tstamp = now;
2371 if (prefered_lft > 0)
2372 ift->flags &= ~IFA_F_DEPRECATED;
2373
2374 spin_unlock(&ift->lock);
2375 if (!(flags&IFA_F_TENTATIVE))
2376 ipv6_ifa_notify(0, ift);
2377 }
2378
2379 if ((create || list_empty(&idev->tempaddr_list)) &&
2380 idev->cnf.use_tempaddr > 0) {
2381 /* When a new public address is created as described
2382 * in [ADDRCONF], also create a new temporary address.
2383 * Also create a temporary address if it's enabled but
2384 * no temporary address currently exists.
2385 */
2386 read_unlock_bh(&idev->lock);
2387 ipv6_create_tempaddr(ifp, NULL);
2388 } else {
2389 read_unlock_bh(&idev->lock);
2390 }
2391}
2392
cc9da6cc
BM		 2393static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2394{
d35a00b8
FJ		 2395 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2396 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc
BM		 2397}
2398
cc84b3c6
AA		 2399int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2400 const struct prefix_info *pinfo,
2401 struct inet6_dev *in6_dev,
2402 const struct in6_addr *addr, int addr_type,
2403 u32 addr_flags, bool sllao, bool tokenized,
2404 __u32 valid_lft, u32 prefered_lft)
4f672235
AA		 2405{
2406 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2407 int create = 0, update_lft = 0;
2408
2409 if (!ifp && valid_lft) {
2410 int max_addresses = in6_dev->cnf.max_addresses;
2411
2412#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2413 if (in6_dev->cnf.optimistic_dad &&
2414 !net->ipv6.devconf_all->forwarding && sllao)
2415 addr_flags |= IFA_F_OPTIMISTIC;
2416#endif
2417
2418 /* Do not allow to create too much of autoconfigured
2419 * addresses; this would be too easy way to crash kernel.
2420 */
2421 if (!max_addresses ||
2422 ipv6_count_addresses(in6_dev) < max_addresses)
2423 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2424 pinfo->prefix_len,
2425 addr_type&IPV6_ADDR_SCOPE_MASK,
2426 addr_flags, valid_lft,
2427 prefered_lft);
2428
2429 if (IS_ERR_OR_NULL(ifp))
2430 return -1;
2431
2432 update_lft = 0;
2433 create = 1;
2434 spin_lock_bh(&ifp->lock);
2435 ifp->flags |= IFA_F_MANAGETEMPADDR;
2436 ifp->cstamp = jiffies;
2437 ifp->tokenized = tokenized;
2438 spin_unlock_bh(&ifp->lock);
2439 addrconf_dad_start(ifp);
2440 }
2441
2442 if (ifp) {
2443 u32 flags;
2444 unsigned long now;
2445 u32 stored_lft;
2446
2447 /* update lifetime (RFC2462 5.5.3 e) */
2448 spin_lock_bh(&ifp->lock);
2449 now = jiffies;
2450 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2451 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2452 else
2453 stored_lft = 0;
2454 if (!update_lft && !create && stored_lft) {
2455 const u32 minimum_lft = min_t(u32,
2456 stored_lft, MIN_VALID_LIFETIME);
2457 valid_lft = max(valid_lft, minimum_lft);
2458
2459 /* RFC4862 Section 5.5.3e:
2460 * "Note that the preferred lifetime of the
2461 * corresponding address is always reset to
2462 * the Preferred Lifetime in the received
2463 * Prefix Information option, regardless of
2464 * whether the valid lifetime is also reset or
2465 * ignored."
2466 *
2467 * So we should always update prefered_lft here.
2468 */
2469 update_lft = 1;
2470 }
2471
2472 if (update_lft) {
2473 ifp->valid_lft = valid_lft;
2474 ifp->prefered_lft = prefered_lft;
2475 ifp->tstamp = now;
2476 flags = ifp->flags;
2477 ifp->flags &= ~IFA_F_DEPRECATED;
2478 spin_unlock_bh(&ifp->lock);
2479
2480 if (!(flags&IFA_F_TENTATIVE))
2481 ipv6_ifa_notify(0, ifp);
2482 } else
2483 spin_unlock_bh(&ifp->lock);
2484
2485 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2486 create, now);
2487
2488 in6_ifa_put(ifp);
2489 addrconf_verify();
2490 }
2491
2492 return 0;
2493}
cc84b3c6 2494EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
4f672235 2495
e6bff995 2496void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2497{
2498 struct prefix_info *pinfo;
2499 __u32 valid_lft;
2500 __u32 prefered_lft;
4f672235 2501 int addr_type, err;
64236f3f 2502 u32 addr_flags = 0;
1da177e4 2503 struct inet6_dev *in6_dev;
56d417b1 2504 struct net *net = dev_net(dev);
1da177e4
LT		 2505
2506 pinfo = (struct prefix_info *) opt;
1ab1457c 2507
1da177e4 2508 if (len < sizeof(struct prefix_info)) {
ba3542e1 2509 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2510 return;
2511 }
1ab1457c 2512
1da177e4
LT		 2513 /*
2514 * Validation checks ([ADDRCONF], page 19)
2515 */
2516
2517 addr_type = ipv6_addr_type(&pinfo->prefix);
2518
2519 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2520 return;
2521
2522 valid_lft = ntohl(pinfo->valid);
2523 prefered_lft = ntohl(pinfo->prefered);
2524
2525 if (prefered_lft > valid_lft) {
e87cc472 2526 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2527 return;
2528 }
2529
2530 in6_dev = in6_dev_get(dev);
2531
63159f29 2532 if (!in6_dev) {
e87cc472
JP		 2533 net_dbg_ratelimited("addrconf: device %s not configured\n",
2534 dev->name);
1da177e4
LT		 2535 return;
2536 }
2537
2538 /*
2539 * Two things going on here:
2540 * 1) Add routes for on-link prefixes
2541 * 2) Configure prefixes with the auto flag set
2542 */
2543
4bed72e4
YH		 2544 if (pinfo->onlink) {
2545 struct rt6_info *rt;
2546 unsigned long rt_expires;
2547
6f704992
YH		 2548 /* Avoid arithmetic overflow. Really, we could
2549 * save rt_expires in seconds, likely valid_lft,
2550 * but it would require division in fib gc, that it
2551 * not good.
2552 */
4bed72e4
YH		 2553 if (HZ > USER_HZ)
2554 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2555 else
2556 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2557
4bed72e4
YH		 2558 if (addrconf_finite_timeout(rt_expires))
2559 rt_expires *= HZ;
1da177e4 2560
14ef37b6
AH		 2561 rt = addrconf_get_prefix_route(&pinfo->prefix,
2562 pinfo->prefix_len,
2563 dev,
2564 RTF_ADDRCONF | RTF_PREFIX_RT,
2565 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2566
14ef37b6 2567 if (rt) {
6f704992
YH		 2568 /* Autoconf prefix route */
2569 if (valid_lft == 0) {
2570 ip6_del_rt(rt);
2571 rt = NULL;
4bed72e4 2572 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2573 /* not infinity */
1716a961 2574 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2575 } else {
1716a961 2576 rt6_clean_expires(rt);
1da177e4
LT		 2577 }
2578 } else if (valid_lft) {
6f704992 2579 clock_t expires = 0;
4bed72e4
YH		 2580 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2581 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2582 /* not infinity */
2583 flags |= RTF_EXPIRES;
2584 expires = jiffies_to_clock_t(rt_expires);
2585 }
1da177e4 2586 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2587 dev, expires, flags);
1da177e4 2588 }
94e187c0 2589 ip6_rt_put(rt);
1da177e4
LT		 2590 }
2591
2592 /* Try to figure out our local address for this prefix */
2593
2594 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1da177e4 2595 struct in6_addr addr;
f997c55c 2596 bool tokenized = false, dev_addr_generated = false;
1da177e4
LT		 2597
2598 if (pinfo->prefix_len == 64) {
2599 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2600
2601 if (!ipv6_addr_any(&in6_dev->token)) {
2602 read_lock_bh(&in6_dev->lock);
2603 memcpy(addr.s6_addr + 8,
2604 in6_dev->token.s6_addr + 8, 8);
2605 read_unlock_bh(&in6_dev->lock);
617fe29d 2606 tokenized = true;
cc9da6cc 2607 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2608 !ipv6_generate_stable_address(&addr, 0,
2609 in6_dev)) {
64236f3f 2610 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2611 goto ok;
f53adae4
DB		 2612 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2613 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
4f672235 2614 goto put;
f997c55c
AA		 2615 } else {
2616 dev_addr_generated = true;
1da177e4
LT		 2617 }
2618 goto ok;
2619 }
e87cc472
JP		 2620 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2621 pinfo->prefix_len);
4f672235 2622 goto put;
1da177e4
LT		 2623
2624ok:
4f672235
AA		 2625 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2626 &addr, addr_type,
2627 addr_flags, sllao,
2628 tokenized, valid_lft,
2629 prefered_lft);
2630 if (err)
2631 goto put;
f997c55c
AA		 2632
2633 /* Ignore error case here because previous prefix add addr was
2634 * successful which will be notified.
2635 */
2636 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2637 addr_type, addr_flags, sllao,
2638 tokenized, valid_lft,
2639 prefered_lft,
2640 dev_addr_generated);
1da177e4
LT		 2641 }
2642 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
4f672235 2643put:
1da177e4
LT		 2644 in6_dev_put(in6_dev);
2645}
2646
2647/*
2648 * Set destination address.
2649 * Special case for SIT interfaces where we create a new "virtual"
2650 * device.
2651 */
af284937 2652int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2653{
2654 struct in6_ifreq ireq;
2655 struct net_device *dev;
2656 int err = -EINVAL;
2657
2658 rtnl_lock();
2659
2660 err = -EFAULT;
2661 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2662 goto err_exit;
2663
af284937 2664 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2665
2666 err = -ENODEV;
63159f29 2667 if (!dev)
1da177e4
LT		 2668 goto err_exit;
2669
07a93626 2670#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2671 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2672 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2673 struct ifreq ifr;
1da177e4
LT		 2674 struct ip_tunnel_parm p;
2675
2676 err = -EADDRNOTAVAIL;
2677 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2678 goto err_exit;
2679
2680 memset(&p, 0, sizeof(p));
2681 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2682 p.iph.saddr = 0;
2683 p.iph.version = 4;
2684 p.iph.ihl = 5;
2685 p.iph.protocol = IPPROTO_IPV6;
2686 p.iph.ttl = 64;
d20b3109 2687 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2688
5bc3eb7e
SH		 2689 if (ops->ndo_do_ioctl) {
2690 mm_segment_t oldfs = get_fs();
2691
2692 set_fs(KERNEL_DS);
2693 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2694 set_fs(oldfs);
2695 } else
2696 err = -EOPNOTSUPP;
1da177e4
LT		 2697
2698 if (err == 0) {
2699 err = -ENOBUFS;
af284937
DL		 2700 dev = __dev_get_by_name(net, p.name);
2701 if (!dev)
1da177e4
LT		 2702 goto err_exit;
2703 err = dev_open(dev);
2704 }
2705 }
0be669bb 2706#endif
1da177e4
LT		 2707
2708err_exit:
2709 rtnl_unlock();
2710 return err;
2711}
2712
93a714d6
MC		 2713static int ipv6_mc_config(struct sock *sk, bool join,
2714 const struct in6_addr *addr, int ifindex)
2715{
2716 int ret;
2717
2718 ASSERT_RTNL();
2719
2720 lock_sock(sk);
2721 if (join)
54ff9ef3 2722 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2723 else
54ff9ef3 2724 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2725 release_sock(sk);
2726
2727 return ret;
2728}
2729
1da177e4
LT		 2730/*
2731 * Manual configuration of address on an interface
2732 */
479840ff
JP		 2733static int inet6_addr_add(struct net *net, int ifindex,
2734 const struct in6_addr *pfx,
caeaba79 2735 const struct in6_addr *peer_pfx,
479840ff
JP		 2736 unsigned int plen, __u32 ifa_flags,
2737 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2738{
2739 struct inet6_ifaddr *ifp;
2740 struct inet6_dev *idev;
2741 struct net_device *dev;
93a714d6
MC		 2742 unsigned long timeout;
2743 clock_t expires;
1da177e4 2744 int scope;
6f704992 2745 u32 flags;
1da177e4
LT		 2746
2747 ASSERT_RTNL();
1ab1457c 2748
24ef0da7
TG		 2749 if (plen > 128)
2750 return -EINVAL;
2751
0778769d
NT		 2752 /* check the lifetime */
2753 if (!valid_lft || prefered_lft > valid_lft)
2754 return -EINVAL;
2755
53bd6749
JP		 2756 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2757 return -EINVAL;
2758
af284937
DL		 2759 dev = __dev_get_by_index(net, ifindex);
2760 if (!dev)
1da177e4 2761 return -ENODEV;
1ab1457c 2762
64e724f6
BH		 2763 idev = addrconf_add_dev(dev);
2764 if (IS_ERR(idev))
2765 return PTR_ERR(idev);
1da177e4 2766
93a714d6
MC		 2767 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2768 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2769 true, pfx, ifindex);
2770
2771 if (ret < 0)
2772 return ret;
2773 }
2774
1da177e4
LT		 2775 scope = ipv6_addr_scope(pfx);
2776
4bed72e4
YH		 2777 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2778 if (addrconf_finite_timeout(timeout)) {
2779 expires = jiffies_to_clock_t(timeout * HZ);
2780 valid_lft = timeout;
6f704992 2781 flags = RTF_EXPIRES;
4bed72e4
YH		 2782 } else {
2783 expires = 0;
2784 flags = 0;
2785 ifa_flags |= IFA_F_PERMANENT;
6f704992 2786 }
0778769d 2787
4bed72e4
YH		 2788 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2789 if (addrconf_finite_timeout(timeout)) {
2790 if (timeout == 0)
2791 ifa_flags |= IFA_F_DEPRECATED;
2792 prefered_lft = timeout;
2793 }
0778769d 2794
8a226b2c
JB		 2795 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2796 valid_lft, prefered_lft);
0778769d 2797
1da177e4 2798 if (!IS_ERR(ifp)) {
761aac73
TH		 2799 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2800 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2801 expires, flags);
2802 }
2803
95c385b4
NH		 2804 /*
2805 * Note that section 3.1 of RFC 4429 indicates
2806 * that the Optimistic flag should not be set for
2807 * manually configured addresses
2808 */
cf22f9a2 2809 addrconf_dad_start(ifp);
53bd6749
JP		 2810 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2811 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2812 true, jiffies);
1da177e4 2813 in6_ifa_put(ifp);
c15b1cca 2814 addrconf_verify_rtnl();
1da177e4 2815 return 0;
93a714d6
MC		 2816 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2817 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2818 false, pfx, ifindex);
1da177e4
LT		 2819 }
2820
2821 return PTR_ERR(ifp);
2822}
2823
6046d5b4
HK		 2824static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2825 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2826{
2827 struct inet6_ifaddr *ifp;
2828 struct inet6_dev *idev;
2829 struct net_device *dev;
1ab1457c 2830
24ef0da7
TG		 2831 if (plen > 128)
2832 return -EINVAL;
2833
af284937
DL		 2834 dev = __dev_get_by_index(net, ifindex);
2835 if (!dev)
1da177e4
LT		 2836 return -ENODEV;
2837
e5d08d71 2838 idev = __in6_dev_get(dev);
63159f29 2839 if (!idev)
1da177e4
LT		 2840 return -ENXIO;
2841
2842 read_lock_bh(&idev->lock);
502a2ffd 2843 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2844 if (ifp->prefix_len == plen &&
2845 ipv6_addr_equal(pfx, &ifp->addr)) {
2846 in6_ifa_hold(ifp);
2847 read_unlock_bh(&idev->lock);
1ab1457c 2848
6046d5b4
HK		 2849 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2850 (ifa_flags & IFA_F_MANAGETEMPADDR))
2851 manage_tempaddrs(idev, ifp, 0, 0, false,
2852 jiffies);
1da177e4 2853 ipv6_del_addr(ifp);
6046d5b4 2854 addrconf_verify_rtnl();
93a714d6
MC		 2855 if (ipv6_addr_is_multicast(pfx)) {
2856 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2857 false, pfx, dev->ifindex);
2858 }
1da177e4
LT		 2859 return 0;
2860 }
2861 }
2862 read_unlock_bh(&idev->lock);
2863 return -EADDRNOTAVAIL;
2864}
2865
2866
af284937 2867int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2868{
2869 struct in6_ifreq ireq;
2870 int err;
1ab1457c 2871
af31f412 2872 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2873 return -EPERM;
1ab1457c 2874
1da177e4
LT		 2875 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2876 return -EFAULT;
2877
2878 rtnl_lock();
caeaba79 2879 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2880 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2881 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2882 rtnl_unlock();
2883 return err;
2884}
2885
af284937 2886int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2887{
2888 struct in6_ifreq ireq;
2889 int err;
1ab1457c 2890
af31f412 2891 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2892 return -EPERM;
2893
2894 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2895 return -EFAULT;
2896
2897 rtnl_lock();
6046d5b4 2898 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2899 ireq.ifr6_prefixlen);
1da177e4
LT		 2900 rtnl_unlock();
2901 return err;
2902}
2903
b5f348e5
IJ		 2904static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2905 int plen, int scope)
2906{
2907 struct inet6_ifaddr *ifp;
2908
8a226b2c 2909 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2910 scope, IFA_F_PERMANENT,
2911 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2912 if (!IS_ERR(ifp)) {
2913 spin_lock_bh(&ifp->lock);
2914 ifp->flags &= ~IFA_F_TENTATIVE;
2915 spin_unlock_bh(&ifp->lock);
764d3be6 2916 rt_genid_bump_ipv6(dev_net(idev->dev));
b5f348e5
IJ		 2917 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2918 in6_ifa_put(ifp);
2919 }
2920}
2921
07a93626 2922#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2923static void sit_add_v4_addrs(struct inet6_dev *idev)
2924{
1da177e4
LT		 2925 struct in6_addr addr;
2926 struct net_device *dev;
c346dca1 2927 struct net *net = dev_net(idev->dev);
929c9cf3 2928 int scope, plen;
f0e2acfa 2929 u32 pflags = 0;
1da177e4
LT		 2930
2931 ASSERT_RTNL();
2932
2933 memset(&addr, 0, sizeof(struct in6_addr));
2934 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2935
2936 if (idev->dev->flags&IFF_POINTOPOINT) {
2937 addr.s6_addr32[0] = htonl(0xfe800000);
2938 scope = IFA_LINK;
929c9cf3 2939 plen = 64;
1da177e4
LT		 2940 } else {
2941 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2942 plen = 96;
f0e2acfa 2943 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2944 }
2945
2946 if (addr.s6_addr32[3]) {
929c9cf3 2947 add_addr(idev, &addr, plen, scope);
f0e2acfa 2948 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2949 return;
2950 }
2951
6fda7350 2952 for_each_netdev(net, dev) {
8e5e8f30 2953 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2954 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2955 struct in_ifaddr *ifa;
1da177e4
LT		 2956
2957 int flag = scope;
2958
2959 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2960
2961 addr.s6_addr32[3] = ifa->ifa_local;
2962
2963 if (ifa->ifa_scope == RT_SCOPE_LINK)
2964 continue;
2965 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2966 if (idev->dev->flags&IFF_POINTOPOINT)
2967 continue;
2968 flag |= IFA_HOST;
2969 }
1da177e4 2970
b5f348e5 2971 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2972 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2973 pflags);
1da177e4
LT		 2974 }
2975 }
1ab1457c 2976 }
1da177e4 2977}
0be669bb 2978#endif
1da177e4
LT		 2979
2980static void init_loopback(struct net_device *dev)
2981{
2982 struct inet6_dev *idev;
25fb6ca4
BK		 2983 struct net_device *sp_dev;
2984 struct inet6_ifaddr *sp_ifa;
2985 struct rt6_info *sp_rt;
1da177e4
LT		 2986
2987 /* ::1 */
2988
2989 ASSERT_RTNL();
2990
e5d08d71 2991 idev = ipv6_find_idev(dev);
63159f29 2992 if (!idev) {
91df42be 2993 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2994 return;
2995 }
2996
b5f348e5 2997 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2998
2999 /* Add routes to other interface's IPv6 addresses */
3000 for_each_netdev(dev_net(dev), sp_dev) {
3001 if (!strcmp(sp_dev->name, dev->name))
3002 continue;
3003
3004 idev = __in6_dev_get(sp_dev);
3005 if (!idev)
3006 continue;
3007
3008 read_lock_bh(&idev->lock);
3009 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
3010
3011 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
3012 continue;
3013
33d99113
G		 3014 if (sp_ifa->rt) {
3015 /* This dst has been added to garbage list when
3016 * lo device down, release this obsolete dst and
3017 * reallocate a new router for ifa.
3018 */
a220445f 3019 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
33d99113
G		 3020 ip6_rt_put(sp_ifa->rt);
3021 sp_ifa->rt = NULL;
3022 } else {
3023 continue;
3024 }
3025 }
a881ae1f 3026
57ec0afe 3027 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 3028
3029 /* Failure cases are ignored */
534c8779
G		 3030 if (!IS_ERR(sp_rt)) {
3031 sp_ifa->rt = sp_rt;
25fb6ca4 3032 ip6_ins_rt(sp_rt);
534c8779 3033 }
25fb6ca4
BK		 3034 }
3035 read_unlock_bh(&idev->lock);
3036 }
1da177e4
LT		 3037}
3038
2ad3ed59
AA		 3039void addrconf_add_linklocal(struct inet6_dev *idev,
3040 const struct in6_addr *addr, u32 flags)
1da177e4 3041{
8e5e8f30 3042 struct inet6_ifaddr *ifp;
64236f3f 3043 u32 addr_flags = flags | IFA_F_PERMANENT;
95c385b4
NH		 3044
3045#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3046 if (idev->cnf.optimistic_dad &&
702beb87 3047 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 3048 addr_flags |= IFA_F_OPTIMISTIC;
3049#endif
1da177e4 3050
07edd741
HFS		 3051 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3052 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 3053 if (!IS_ERR(ifp)) {
46d48046 3054 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 3055 addrconf_dad_start(ifp);
1da177e4
LT		 3056 in6_ifa_put(ifp);
3057 }
3058}
2ad3ed59 3059EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
1da177e4 3060
622c81d5
HFS		 3061static bool ipv6_reserved_interfaceid(struct in6_addr address)
3062{
3063 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3064 return true;
3065
3066 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3067 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3068 return true;
3069
3070 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3071 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3072 return true;
3073
3074 return false;
3075}
3076
3077static int ipv6_generate_stable_address(struct in6_addr *address,
3078 u8 dad_count,
3079 const struct inet6_dev *idev)
3080{
622c81d5
HFS		 3081 static DEFINE_SPINLOCK(lock);
3082 static __u32 digest[SHA_DIGEST_WORDS];
3083 static __u32 workspace[SHA_WORKSPACE_WORDS];
3084
3085 static union {
3086 char __data[SHA_MESSAGE_BYTES];
3087 struct {
3088 struct in6_addr secret;
ff40217e 3089 __be32 prefix[2];
622c81d5
HFS		 3090 unsigned char hwaddr[MAX_ADDR_LEN];
3091 u8 dad_count;
3092 } __packed;
3093 } data;
3094
3095 struct in6_addr secret;
3096 struct in6_addr temp;
3097 struct net *net = dev_net(idev->dev);
3098
3099 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3100
3101 if (idev->cnf.stable_secret.initialized)
3102 secret = idev->cnf.stable_secret.secret;
3103 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3104 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3105 else
3106 return -1;
3107
3108retry:
3109 spin_lock_bh(&lock);
3110
3111 sha_init(digest);
3112 memset(&data, 0, sizeof(data));
3113 memset(workspace, 0, sizeof(workspace));
3114 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3115 data.prefix[0] = address->s6_addr32[0];
3116 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3117 data.secret = secret;
3118 data.dad_count = dad_count;
3119
3120 sha_transform(digest, data.__data, workspace);
3121
3122 temp = *address;
ff40217e
HFS		 3123 temp.s6_addr32[2] = (__force __be32)digest[0];
3124 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3125
3126 spin_unlock_bh(&lock);
3127
3128 if (ipv6_reserved_interfaceid(temp)) {
3129 dad_count++;
1855b7c3 3130 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3131 return -1;
3132 goto retry;
3133 }
3134
3135 *address = temp;
3136 return 0;
3137}
3138
cc9da6cc
BM		 3139static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3140{
3141 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3142
3143 if (s->initialized)
3144 return;
3145 s = &idev->cnf.stable_secret;
3146 get_random_bytes(&s->secret, sizeof(s->secret));
3147 s->initialized = true;
3148}
3149
bc91b0f0
JP		 3150static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3151{
622c81d5
HFS		 3152 struct in6_addr addr;
3153
ca254490
DA		 3154 /* no link local addresses on L3 master devices */
3155 if (netif_is_l3_master(idev->dev))
3156 return;
3157
622c81d5 3158 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3159
d35a00b8 3160 switch (idev->cnf.addr_gen_mode) {
cc9da6cc
BM		 3161 case IN6_ADDR_GEN_MODE_RANDOM:
3162 ipv6_gen_mode_random_init(idev);
3163 /* fallthrough */
3164 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3165 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3166 addrconf_add_linklocal(idev, &addr,
3167 IFA_F_STABLE_PRIVACY);
622c81d5
HFS		 3168 else if (prefix_route)
3169 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3170 break;
3171 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3172 /* addrconf_add_linklocal also adds a prefix_route and we
3173 * only need to care about prefix routes if ipv6_generate_eui64
3174 * couldn't generate one.
3175 */
3176 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3177 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0
JP		 3178 else if (prefix_route)
3179 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3180 break;
3181 case IN6_ADDR_GEN_MODE_NONE:
3182 default:
3183 /* will not add any link local address */
3184 break;
bc91b0f0
JP		 3185 }
3186}
3187
1da177e4
LT		 3188static void addrconf_dev_config(struct net_device *dev)
3189{
8e5e8f30 3190 struct inet6_dev *idev;
1da177e4
LT		 3191
3192 ASSERT_RTNL();
3193
74235a25
HX		 3194 if ((dev->type != ARPHRD_ETHER) &&
3195 (dev->type != ARPHRD_FDDI) &&
74235a25 3196 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3197 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3198 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3199 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc 3200 (dev->type != ARPHRD_6LOWPAN) &&
45ce0fd1
FJ		 3201 (dev->type != ARPHRD_IP6GRE) &&
3202 (dev->type != ARPHRD_IPGRE) &&
3203 (dev->type != ARPHRD_TUNNEL) &&
cc9da6cc 3204 (dev->type != ARPHRD_NONE)) {
74235a25
HX		 3205 /* Alas, we support only Ethernet autoconfiguration. */
3206 return;
3207 }
3208
1da177e4 3209 idev = addrconf_add_dev(dev);
64e724f6 3210 if (IS_ERR(idev))
1da177e4
LT		 3211 return;
3212
cc9da6cc
BM		 3213 /* this device type has no EUI support */
3214 if (dev->type == ARPHRD_NONE &&
d35a00b8
FJ		 3215 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3216 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc 3217
bc91b0f0 3218 addrconf_addr_gen(idev, false);
1da177e4
LT		 3219}
3220
07a93626 3221#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3222static void addrconf_sit_config(struct net_device *dev)
3223{
3224 struct inet6_dev *idev;
3225
3226 ASSERT_RTNL();
3227
1ab1457c
YH		 3228 /*
3229 * Configure the tunnel with one of our IPv4
3230 * addresses... we should configure all of
1da177e4
LT		 3231 * our v4 addrs in the tunnel
3232 */
3233
e5d08d71 3234 idev = ipv6_find_idev(dev);
63159f29 3235 if (!idev) {
91df42be 3236 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3237 return;
3238 }
3239
c7dc89c0 3240 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3241 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3242 return;
3243 }
3244
1da177e4
LT		 3245 sit_add_v4_addrs(idev);
3246
62b54dd9 3247 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3248 addrconf_add_mroute(dev);
1da177e4 3249}
0be669bb 3250#endif
1da177e4 3251
07a93626 3252#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3253static void addrconf_gre_config(struct net_device *dev)
3254{
3255 struct inet6_dev *idev;
aee80b54 3256
aee80b54 3257 ASSERT_RTNL();
3258
e5d08d71 3259 idev = ipv6_find_idev(dev);
63159f29 3260 if (!idev) {
91df42be 3261 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3262 return;
3263 }
3264
bc91b0f0 3265 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3266 if (dev->flags & IFF_POINTOPOINT)
3267 addrconf_add_mroute(dev);
aee80b54 3268}
3269#endif
3270
f1705ec1
DA		 3271static int fixup_permanent_addr(struct inet6_dev *idev,
3272 struct inet6_ifaddr *ifp)
3273{
3274 if (!ifp->rt) {
3275 struct rt6_info *rt;
3276
3277 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3278 if (unlikely(IS_ERR(rt)))
3279 return PTR_ERR(rt);
3280
3281 ifp->rt = rt;
3282 }
3283
3284 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3285 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3286 idev->dev, 0, 0);
3287 }
3288
3289 addrconf_dad_start(ifp);
3290
3291 return 0;
3292}
3293
3294static void addrconf_permanent_addr(struct net_device *dev)
3295{
3296 struct inet6_ifaddr *ifp, *tmp;
3297 struct inet6_dev *idev;
3298
3299 idev = __in6_dev_get(dev);
3300 if (!idev)
3301 return;
3302
3303 write_lock_bh(&idev->lock);
3304
3305 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3306 if ((ifp->flags & IFA_F_PERMANENT) &&
3307 fixup_permanent_addr(idev, ifp) < 0) {
3308 write_unlock_bh(&idev->lock);
3309 ipv6_del_addr(ifp);
3310 write_lock_bh(&idev->lock);
3311
3312 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3313 idev->dev->name, &ifp->addr);
3314 }
3315 }
3316
3317 write_unlock_bh(&idev->lock);
3318}
3319
1ab1457c 3320static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3321 void *ptr)
1da177e4 3322{
351638e7 3323 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4f7f34ea 3324 struct netdev_notifier_changeupper_info *info;
748e2d93 3325 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 3326 int run_pending = 0;
b217d616 3327 int err;
1da177e4 3328
e21e8467 3329 switch (event) {
45ba9dd2 3330 case NETDEV_REGISTER:
74235a25 3331 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3332 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3333 if (IS_ERR(idev))
3334 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3335 }
3336 break;
bcdd553f 3337
b7b0b1d2
AD		 3338 case NETDEV_CHANGEMTU:
3339 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3340 if (dev->mtu < IPV6_MIN_MTU) {
3341 addrconf_ifdown(dev, 1);
3342 break;
3343 }
3344
3345 if (idev) {
3346 rt6_mtu_change(dev, dev->mtu);
3347 idev->cnf.mtu6 = dev->mtu;
3348 break;
3349 }
3350
3351 /* allocate new idev */
3352 idev = ipv6_add_dev(dev);
3353 if (IS_ERR(idev))
3354 break;
3355
3356 /* device is still not ready */
3357 if (!(idev->if_flags & IF_READY))
3358 break;
3359
3360 run_pending = 1;
3361
3362 /* fall through */
3363
1da177e4 3364 case NETDEV_UP:
3c21edbd 3365 case NETDEV_CHANGE:
c2edacf8
JV		 3366 if (dev->flags & IFF_SLAVE)
3367 break;
3368
3ce62a84
WC		 3369 if (idev && idev->cnf.disable_ipv6)
3370 break;
3371
3c21edbd 3372 if (event == NETDEV_UP) {
38bd10c4
DA		 3373 /* restore routes for permanent addresses */
3374 addrconf_permanent_addr(dev);
3375
f24e3d65 3376 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 3377 /* device is not ready yet. */
f3213831 3378 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3379 dev->name);
3380 break;
3381 }
99081049 3382
d31c7b8f
EP		 3383 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3384 idev = ipv6_add_dev(dev);
3385
a317a2f1 3386 if (!IS_ERR_OR_NULL(idev)) {
99081049 3387 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3388 run_pending = 1;
3389 }
b7b0b1d2 3390 } else if (event == NETDEV_CHANGE) {
f24e3d65 3391 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 3392 /* device is still not ready. */
3393 break;
3394 }
3395
3396 if (idev) {
a088d1d7
LL		 3397 if (idev->if_flags & IF_READY) {
3398 /* device is already configured -
3399 * but resend MLD reports, we might
3400 * have roamed and need to update
3401 * multicast snooping switches
3402 */
3403 ipv6_mc_up(idev);
3c21edbd 3404 break;
a088d1d7 3405 }
3c21edbd
YH		 3406 idev->if_flags |= IF_READY;
3407 }
3408
f3213831
JP		 3409 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3410 dev->name);
3c21edbd 3411
c5e33bdd 3412 run_pending = 1;
3c21edbd
YH		 3413 }
3414
e21e8467 3415 switch (dev->type) {
07a93626 3416#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3417 case ARPHRD_SIT:
3418 addrconf_sit_config(dev);
3419 break;
aee80b54 3420#endif
07a93626 3421#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3422 case ARPHRD_IPGRE:
3423 addrconf_gre_config(dev);
3424 break;
0be669bb 3425#endif
1da177e4
LT		 3426 case ARPHRD_LOOPBACK:
3427 init_loopback(dev);
3428 break;
3429
3430 default:
3431 addrconf_dev_config(dev);
3432 break;
3ff50b79 3433 }
bcdd553f 3434
a317a2f1 3435 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3436 if (run_pending)
3437 addrconf_dad_run(idev);
3438
bcdd553f
SH		 3439 /*
3440 * If the MTU changed during the interface down,
3441 * when the interface up, the changed MTU must be
3442 * reflected in the idev as well as routers.
1da177e4 3443 */
bcdd553f
SH		 3444 if (idev->cnf.mtu6 != dev->mtu &&
3445 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3446 rt6_mtu_change(dev, dev->mtu);
3447 idev->cnf.mtu6 = dev->mtu;
3448 }
3449 idev->tstamp = jiffies;
3450 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3451
3452 /*
3453 * If the changed mtu during down is lower than
3454 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3455 */
3456 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 3457 addrconf_ifdown(dev, 1);
1da177e4
LT		 3458 }
3459 break;
3460
1da177e4
LT		 3461 case NETDEV_DOWN:
3462 case NETDEV_UNREGISTER:
3463 /*
3464 * Remove all addresses from this interface.
3465 */
3466 addrconf_ifdown(dev, event != NETDEV_DOWN);
3467 break;
3c21edbd 3468
1da177e4 3469 case NETDEV_CHANGENAME:
1da177e4 3470 if (idev) {
5632c515 3471 snmp6_unregister_dev(idev);
408c4768 3472 addrconf_sysctl_unregister(idev);
a317a2f1 3473 err = addrconf_sysctl_register(idev);
b217d616
HX		 3474 if (err)
3475 return notifier_from_errno(err);
a317a2f1
WC		 3476 err = snmp6_register_dev(idev);
3477 if (err) {
3478 addrconf_sysctl_unregister(idev);
3479 return notifier_from_errno(err);
3480 }
5632c515 3481 }
1da177e4 3482 break;
bcdd553f 3483
93d9b7d7
JP		 3484 case NETDEV_PRE_TYPE_CHANGE:
3485 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3486 if (idev)
3487 addrconf_type_change(dev, event);
75c78500 3488 break;
4f7f34ea
DA		 3489
3490 case NETDEV_CHANGEUPPER:
3491 info = ptr;
3492
3493 /* flush all routes if dev is linked to or unlinked from
3494 * an L3 master device (e.g., VRF)
3495 */
3496 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3497 addrconf_ifdown(dev, 0);
3ff50b79 3498 }
1da177e4
LT		 3499
3500 return NOTIFY_OK;
3501}
3502
3503/*
3504 * addrconf module should be notified of a device going up
3505 */
3506static struct notifier_block ipv6_dev_notf = {
3507 .notifier_call = addrconf_notify,
1da177e4
LT		 3508};
3509
93d9b7d7 3510static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3511{
3512 struct inet6_dev *idev;
3513 ASSERT_RTNL();
3514
3515 idev = __in6_dev_get(dev);
3516
93d9b7d7 3517 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3518 ipv6_mc_remap(idev);
93d9b7d7 3519 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3520 ipv6_mc_unmap(idev);
3521}
3522
70af921d
DA		 3523static bool addr_is_local(const struct in6_addr *addr)
3524{
3525 return ipv6_addr_type(addr) &
3526 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3527}
3528
1da177e4
LT		 3529static int addrconf_ifdown(struct net_device *dev, int how)
3530{
c346dca1 3531 struct net *net = dev_net(dev);
502a2ffd 3532 struct inet6_dev *idev;
f1705ec1
DA		 3533 struct inet6_ifaddr *ifa, *tmp;
3534 struct list_head del_list;
3535 int _keep_addr;
3536 bool keep_addr;
73a8bd74 3537 int state, i;
1da177e4
LT		 3538
3539 ASSERT_RTNL();
3540
73a8bd74
DM		 3541 rt6_ifdown(net, dev);
3542 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3543
3544 idev = __in6_dev_get(dev);
63159f29 3545 if (!idev)
1da177e4
LT		 3546 return -ENODEV;
3547
bcdd553f
SH		 3548 /*
3549 * Step 1: remove reference to ipv6 device from parent device.
3550 * Do not dev_put!
1da177e4 3551 */
439e2385 3552 if (how) {
1da177e4 3553 idev->dead = 1;
8814c4b5
YH		 3554
3555 /* protected by rtnl_lock */
a9b3cd7f 3556 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3557
3558 /* Step 1.5: remove snmp6 entry */
3559 snmp6_unregister_dev(idev);
3560
3561 }
3562
f1705ec1
DA		 3563 /* aggregate the system setting and interface setting */
3564 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3565 if (!_keep_addr)
3566 _keep_addr = idev->cnf.keep_addr_on_down;
3567
3568 /* combine the user config with event to determine if permanent
3569 * addresses are to be removed from address hash table
3570 */
bc561632 3571 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
f1705ec1 3572
73a8bd74
DM		 3573 /* Step 2: clear hash table */
3574 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3575 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3576
3577 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3578restart:
b67bfe0d 3579 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3580 if (ifa->idev == idev) {
c15b1cca 3581 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3582 /* combined flag + permanent flag decide if
3583 * address is retained on a down event
3584 */
3585 if (!keep_addr ||
70af921d
DA		 3586 !(ifa->flags & IFA_F_PERMANENT) ||
3587 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3588 hlist_del_init_rcu(&ifa->addr_lst);
3589 goto restart;
3590 }
73a8bd74
DM		 3591 }
3592 }
3593 spin_unlock_bh(&addrconf_hash_lock);
3594 }
3595
1da177e4
LT		 3596 write_lock_bh(&idev->lock);
3597
b7b1bfce
HFS		 3598 addrconf_del_rs_timer(idev);
3599
bcdd553f 3600 /* Step 2: clear flags for stateless addrconf */
439e2385 3601 if (!how)
3c21edbd 3602 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3603
bcdd553f 3604 /* Step 3: clear tempaddr list */
372e6c8f 3605 while (!list_empty(&idev->tempaddr_list)) {
3606 ifa = list_first_entry(&idev->tempaddr_list,
3607 struct inet6_ifaddr, tmp_list);
3608 list_del(&ifa->tmp_list);
1da177e4
LT		 3609 write_unlock_bh(&idev->lock);
3610 spin_lock_bh(&ifa->lock);
3611
3612 if (ifa->ifpub) {
3613 in6_ifa_put(ifa->ifpub);
3614 ifa->ifpub = NULL;
3615 }
3616 spin_unlock_bh(&ifa->lock);
3617 in6_ifa_put(ifa);
3618 write_lock_bh(&idev->lock);
3619 }
8f37ada5 3620
f1705ec1
DA		 3621 /* re-combine the user config with event to determine if permanent
3622 * addresses are to be removed from the interface list
3623 */
bc561632 3624 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
84e8b803 3625
f1705ec1
DA		 3626 INIT_LIST_HEAD(&del_list);
3627 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
38bd10c4 3628 struct rt6_info *rt = NULL;
a2d6cbb0 3629 bool keep;
38bd10c4 3630
f1705ec1 3631 addrconf_del_dad_work(ifa);
84e8b803 3632
a2d6cbb0
RV		 3633 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3634 !addr_is_local(&ifa->addr);
3635 if (!keep)
3636 list_move(&ifa->if_list, &del_list);
3637
73a8bd74 3638 write_unlock_bh(&idev->lock);
8e8e676d 3639 spin_lock_bh(&ifa->lock);
f1705ec1 3640
a2d6cbb0 3641 if (keep) {
f1705ec1
DA		 3642 /* set state to skip the notifier below */
3643 state = INET6_IFADDR_STATE_DEAD;
3644 ifa->state = 0;
3645 if (!(ifa->flags & IFA_F_NODAD))
3646 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3647
3648 rt = ifa->rt;
3649 ifa->rt = NULL;
f1705ec1
DA		 3650 } else {
3651 state = ifa->state;
3652 ifa->state = INET6_IFADDR_STATE_DEAD;
f1705ec1
DA		 3653 }
3654
8e8e676d 3655 spin_unlock_bh(&ifa->lock);
9d82ca98 3656
38bd10c4
DA		 3657 if (rt)
3658 ip6_del_rt(rt);
3659
73a8bd74
DM		 3660 if (state != INET6_IFADDR_STATE_DEAD) {
3661 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3662 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
ea06f717
MM		 3663 } else {
3664 if (idev->cnf.forwarding)
3665 addrconf_leave_anycast(ifa);
3666 addrconf_leave_solict(ifa->idev, &ifa->addr);
27bdb2ab 3667 }
8f37ada5 3668
73a8bd74
DM		 3669 write_lock_bh(&idev->lock);
3670 }
8f37ada5 3671
1da177e4
LT		 3672 write_unlock_bh(&idev->lock);
3673
f1705ec1
DA		 3674 /* now clean up addresses to be removed */
3675 while (!list_empty(&del_list)) {
3676 ifa = list_first_entry(&del_list,
3677 struct inet6_ifaddr, if_list);
3678 list_del(&ifa->if_list);
3679
3680 in6_ifa_put(ifa);
3681 }
3682
381f4dca
SD		 3683 /* Step 5: Discard anycast and multicast list */
3684 if (how) {
3685 ipv6_ac_destroy_dev(idev);
1da177e4 3686 ipv6_mc_destroy_dev(idev);
381f4dca 3687 } else {
1da177e4 3688 ipv6_mc_down(idev);
381f4dca 3689 }
1da177e4 3690
1da177e4 3691 idev->tstamp = jiffies;
1ab1457c 3692
bcdd553f 3693 /* Last: Shot the device (if unregistered) */
439e2385 3694 if (how) {
408c4768 3695 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3696 neigh_parms_release(&nd_tbl, idev->nd_parms);
3697 neigh_ifdown(&nd_tbl, dev);
3698 in6_dev_put(idev);
3699 }
3700 return 0;
3701}
3702
3703static void addrconf_rs_timer(unsigned long data)
3704{
b7b1bfce 3705 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3706 struct net_device *dev = idev->dev;
b7b1bfce 3707 struct in6_addr lladdr;
1da177e4 3708
b7b1bfce 3709 write_lock(&idev->lock);
5b2a1953 3710 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3711 goto out;
3712
9ba2add3 3713 if (!ipv6_accept_ra(idev))
5b2a1953 3714 goto out;
3715
3716 /* Announcement received after solicitation was sent */
3717 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3718 goto out;
1da177e4 3719
bd11f074 3720 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
caf92bc4
CW		 3721 write_unlock(&idev->lock);
3722 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3723 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3724 &in6addr_linklocal_allrouters);
3725 else
caf92bc4 3726 goto put;
1da177e4 3727
caf92bc4 3728 write_lock(&idev->lock);
bd11f074
MŻ		 3729 idev->rs_interval = rfc3315_s14_backoff_update(
3730 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
b7b1bfce
HFS		 3731 /* The wait after the last probe can be shorter */
3732 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3733 idev->cnf.rtr_solicits) ?
3734 idev->cnf.rtr_solicit_delay :
bd11f074 3735 idev->rs_interval);
1da177e4 3736 } else {
1da177e4
LT		 3737 /*
3738 * Note: we do not support deprecated "all on-link"
3739 * assumption any longer.
3740 */
91df42be 3741 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3742 }
3743
3744out:
b7b1bfce 3745 write_unlock(&idev->lock);
caf92bc4 3746put:
b7b1bfce 3747 in6_dev_put(idev);
1da177e4
LT		 3748}
3749
3750/*
3751 * Duplicate Address Detection
3752 */
3c21edbd
YH		 3753static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3754{
3755 unsigned long rand_num;
3756 struct inet6_dev *idev = ifp->idev;
adc176c5 3757 u64 nonce;
3c21edbd 3758
95c385b4
NH		 3759 if (ifp->flags & IFA_F_OPTIMISTIC)
3760 rand_num = 0;
3761 else
63862b5b 3762 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3763
adc176c5
EN		 3764 nonce = 0;
3765 if (idev->cnf.enhanced_dad ||
3766 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3767 do
3768 get_random_bytes(&nonce, 6);
3769 while (nonce == 0);
3770 }
3771 ifp->dad_nonce = nonce;
b7b1bfce 3772 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3773 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3774}
3775
c15b1cca 3776static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3777{
3778 struct inet6_dev *idev = ifp->idev;
3779 struct net_device *dev = idev->dev;
764d3be6 3780 bool bump_id, notify = false;
1da177e4
LT		 3781
3782 addrconf_join_solict(dev, &ifp->addr);
3783
63862b5b 3784 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3785
3786 read_lock_bh(&idev->lock);
622ccdf1 3787 spin_lock(&ifp->lock);
e9d3e084 3788 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3789 goto out;
1da177e4
LT		 3790
3791 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3792 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3793 !(ifp->flags&IFA_F_TENTATIVE) ||
3794 ifp->flags & IFA_F_NODAD) {
764d3be6 3795 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3796 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3797 spin_unlock(&ifp->lock);
1da177e4
LT		 3798 read_unlock_bh(&idev->lock);
3799
764d3be6 3800 addrconf_dad_completed(ifp, bump_id);
1da177e4
LT		 3801 return;
3802 }
3803
6732bade 3804 if (!(idev->if_flags & IF_READY)) {
21809faf 3805 spin_unlock(&ifp->lock);
6732bade 3806 read_unlock_bh(&idev->lock);
3c21edbd 3807 /*
590a9887 3808 * If the device is not ready:
3c21edbd
YH		 3809 * - keep it tentative if it is a permanent address.
3810 * - otherwise, kill it.
3811 */
3812 in6_ifa_hold(ifp);
cc411d0b 3813 addrconf_dad_stop(ifp, 0);
6732bade 3814 return;
3c21edbd 3815 }
95c385b4
NH		 3816
3817 /*
3818 * Optimistic nodes can start receiving
3819 * Frames right away
3820 */
7fd2561e 3821 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3822 ip6_ins_rt(ifp->rt);
7fd2561e
EK		 3823 if (ipv6_use_optimistic_addr(idev)) {
3824 /* Because optimistic nodes can use this address,
3825 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3826 */
16186a82 3827 notify = true;
7fd2561e
EK		 3828 }
3829 }
95c385b4 3830
6732bade 3831 addrconf_dad_kick(ifp);
1da177e4 3832out:
622ccdf1 3833 spin_unlock(&ifp->lock);
1da177e4 3834 read_unlock_bh(&idev->lock);
16186a82
SAK		 3835 if (notify)
3836 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 3837}
3838
c15b1cca 3839static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3840{
c15b1cca
HFS		 3841 bool begin_dad = false;
3842
8e8e676d 3843 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3844 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3845 ifp->state = INET6_IFADDR_STATE_PREDAD;
3846 begin_dad = true;
3847 }
8e8e676d 3848 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3849
3850 if (begin_dad)
3851 addrconf_mod_dad_work(ifp, 0);
3852}
3853
3854static void addrconf_dad_work(struct work_struct *w)
3855{
3856 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3857 struct inet6_ifaddr,
3858 dad_work);
1da177e4 3859 struct inet6_dev *idev = ifp->idev;
764d3be6 3860 bool bump_id, disable_ipv6 = false;
1da177e4
LT		 3861 struct in6_addr mcaddr;
3862
c15b1cca
HFS		 3863 enum {
3864 DAD_PROCESS,
3865 DAD_BEGIN,
3866 DAD_ABORT,
3867 } action = DAD_PROCESS;
3868
3869 rtnl_lock();
3870
8e8e676d 3871 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3872 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3873 action = DAD_BEGIN;
3874 ifp->state = INET6_IFADDR_STATE_DAD;
3875 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3876 action = DAD_ABORT;
3877 ifp->state = INET6_IFADDR_STATE_POSTDAD;
85b51b12
MM		 3878
3879 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3880 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3881 struct in6_addr addr;
3882
3883 addr.s6_addr32[0] = htonl(0xfe800000);
3884 addr.s6_addr32[1] = 0;
3885
3886 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3887 ipv6_addr_equal(&ifp->addr, &addr)) {
3888 /* DAD failed for link-local based on MAC */
3889 idev->cnf.disable_ipv6 = 1;
3890
3891 pr_info("%s: IPv6 being disabled!\n",
3892 ifp->idev->dev->name);
3893 disable_ipv6 = true;
3894 }
3895 }
c15b1cca 3896 }
8e8e676d 3897 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3898
3899 if (action == DAD_BEGIN) {
3900 addrconf_dad_begin(ifp);
3901 goto out;
3902 } else if (action == DAD_ABORT) {
751eb6b6 3903 in6_ifa_hold(ifp);
c15b1cca 3904 addrconf_dad_stop(ifp, 1);
85b51b12
MM		 3905 if (disable_ipv6)
3906 addrconf_ifdown(idev->dev, 0);
c15b1cca
HFS		 3907 goto out;
3908 }
3909
b7b1bfce 3910 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3911 goto out;
3912
c15b1cca 3913 write_lock_bh(&idev->lock);
122e4519 3914 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3915 write_unlock_bh(&idev->lock);
1da177e4
LT		 3916 goto out;
3917 }
21809faf 3918
3919 spin_lock(&ifp->lock);
622ccdf1
HX		 3920 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3921 spin_unlock(&ifp->lock);
c15b1cca 3922 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3923 goto out;
3924 }
3925
b7b1bfce 3926 if (ifp->dad_probes == 0) {
1da177e4
LT		 3927 /*
3928 * DAD was successful
3929 */
3930
764d3be6 3931 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3932 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3933 spin_unlock(&ifp->lock);
c15b1cca 3934 write_unlock_bh(&idev->lock);
1da177e4 3935
764d3be6 3936 addrconf_dad_completed(ifp, bump_id);
1da177e4
LT		 3937
3938 goto out;
3939 }
3940
b7b1bfce 3941 ifp->dad_probes--;
c15b1cca
HFS		 3942 addrconf_mod_dad_work(ifp,
3943 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3944 spin_unlock(&ifp->lock);
c15b1cca 3945 write_unlock_bh(&idev->lock);
1da177e4
LT		 3946
3947 /* send a neighbour solicitation for our addr */
1da177e4 3948 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
adc176c5
EN		 3949 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
3950 ifp->dad_nonce);
1da177e4
LT		 3951out:
3952 in6_ifa_put(ifp);
c15b1cca 3953 rtnl_unlock();
1da177e4
LT		 3954}
3955
11ffff75
HFS		 3956/* ifp->idev must be at least read locked */
3957static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3958{
3959 struct inet6_ifaddr *ifpiter;
3960 struct inet6_dev *idev = ifp->idev;
3961
602582ca
HFS		 3962 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3963 if (ifpiter->scope > IFA_LINK)
3964 break;
11ffff75
HFS		 3965 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3966 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3967 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3968 IFA_F_PERMANENT)
3969 return false;
3970 }
3971 return true;
3972}
3973
764d3be6 3974static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id)
1da177e4 3975{
e21e8467 3976 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3977 struct in6_addr lladdr;
b173ee48 3978 bool send_rs, send_mld;
b7b1bfce 3979
c15b1cca 3980 addrconf_del_dad_work(ifp);
1da177e4
LT		 3981
3982 /*
3983 * Configure the address for reception. Now it is valid.
3984 */
3985
3986 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3987
026359bc
TA		 3988 /* If added prefix is link local and we are prepared to process
3989 router advertisements, start sending router solicitations.
1da177e4
LT		 3990 */
3991
1ec047eb 3992 read_lock_bh(&ifp->idev->lock);
11ffff75 3993 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 3994 send_rs = send_mld &&
3995 ipv6_accept_ra(ifp->idev) &&
bd11f074 3996 ifp->idev->cnf.rtr_solicits != 0 &&
b173ee48 3997 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 3998 read_unlock_bh(&ifp->idev->lock);
3999
b173ee48
HFS		 4000 /* While dad is in progress mld report's source address is in6_addrany.
4001 * Resend with proper ll now.
4002 */
4003 if (send_mld)
4004 ipv6_mc_dad_complete(ifp->idev);
4005
1ec047eb 4006 if (send_rs) {
1da177e4
LT		 4007 /*
4008 * If a host as already performed a random delay
4009 * [...] as part of DAD [...] there is no need
4010 * to delay again before sending the first RS
4011 */
1ec047eb 4012 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 4013 return;
1ec047eb 4014 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 4015
b7b1bfce
HFS		 4016 write_lock_bh(&ifp->idev->lock);
4017 spin_lock(&ifp->lock);
bd11f074
MŻ		 4018 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4019 ifp->idev->cnf.rtr_solicit_interval);
b7b1bfce 4020 ifp->idev->rs_probes = 1;
1da177e4 4021 ifp->idev->if_flags |= IF_RS_SENT;
bd11f074 4022 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
b7b1bfce
HFS		 4023 spin_unlock(&ifp->lock);
4024 write_unlock_bh(&ifp->idev->lock);
1da177e4 4025 }
764d3be6
PA		 4026
4027 if (bump_id)
4028 rt_genid_bump_ipv6(dev_net(dev));
a11a7f71
MH		 4029
4030 /* Make sure that a new temporary address will be created
4031 * before this temporary address becomes deprecated.
4032 */
4033 if (ifp->flags & IFA_F_TEMPORARY)
4034 addrconf_verify_rtnl();
1da177e4
LT		 4035}
4036
e21e8467
SH		 4037static void addrconf_dad_run(struct inet6_dev *idev)
4038{
c5e33bdd
YH		 4039 struct inet6_ifaddr *ifp;
4040
4041 read_lock_bh(&idev->lock);
502a2ffd 4042 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 4043 spin_lock(&ifp->lock);
f2344a13
HX		 4044 if (ifp->flags & IFA_F_TENTATIVE &&
4045 ifp->state == INET6_IFADDR_STATE_DAD)
4046 addrconf_dad_kick(ifp);
21809faf 4047 spin_unlock(&ifp->lock);
c5e33bdd
YH		 4048 }
4049 read_unlock_bh(&idev->lock);
4050}
4051
1da177e4
LT		 4052#ifdef CONFIG_PROC_FS
4053struct if6_iter_state {
3c40090a 4054 struct seq_net_private p;
1da177e4 4055 int bucket;
1d578303 4056 int offset;
1da177e4
LT		 4057};
4058
1d578303 4059static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 4060{
4061 struct inet6_ifaddr *ifa = NULL;
4062 struct if6_iter_state *state = seq->private;
1218854a 4063 struct net *net = seq_file_net(seq);
1d578303 4064 int p = 0;
1da177e4 4065
1d578303
MM		 4066 /* initial bucket if pos is 0 */
4067 if (pos == 0) {
4068 state->bucket = 0;
4069 state->offset = 0;
4070 }
4071
4072 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 4073 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 4074 addr_lst) {
9f0d3c27
ED		 4075 if (!net_eq(dev_net(ifa->idev->dev), net))
4076 continue;
1d578303
MM		 4077 /* sync with offset */
4078 if (p < state->offset) {
4079 p++;
4080 continue;
4081 }
4082 state->offset++;
9f0d3c27 4083 return ifa;
1d578303
MM		 4084 }
4085
4086 /* prepare for next bucket */
4087 state->offset = 0;
4088 p = 0;
1da177e4 4089 }
c2e21293 4090 return NULL;
1da177e4
LT		 4091}
4092
c2e21293 4093static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4094 struct inet6_ifaddr *ifa)
1da177e4
LT		 4095{
4096 struct if6_iter_state *state = seq->private;
1218854a 4097 struct net *net = seq_file_net(seq);
1da177e4 4098
b67bfe0d 4099 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 4100 if (!net_eq(dev_net(ifa->idev->dev), net))
4101 continue;
1d578303 4102 state->offset++;
9f0d3c27 4103 return ifa;
1d578303 4104 }
3c40090a 4105
c2e21293 4106 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 4107 state->offset = 0;
b67bfe0d 4108 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 4109 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 4110 if (!net_eq(dev_net(ifa->idev->dev), net))
4111 continue;
1d578303 4112 state->offset++;
9f0d3c27 4113 return ifa;
c2e21293 4114 }
1da177e4 4115 }
3c40090a 4116
c2e21293 4117 return NULL;
1da177e4
LT		 4118}
4119
1da177e4 4120static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 4121 __acquires(rcu_bh)
1da177e4 4122{
5c578aed 4123 rcu_read_lock_bh();
1d578303 4124 return if6_get_first(seq, *pos);
1da177e4
LT		 4125}
4126
4127static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4128{
4129 struct inet6_ifaddr *ifa;
4130
4131 ifa = if6_get_next(seq, v);
4132 ++*pos;
4133 return ifa;
4134}
4135
4136static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 4137 __releases(rcu_bh)
1da177e4 4138{
5c578aed 4139 rcu_read_unlock_bh();
1da177e4
LT		 4140}
4141
4142static int if6_seq_show(struct seq_file *seq, void *v)
4143{
4144 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4145 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4146 &ifp->addr,
1da177e4
LT		 4147 ifp->idev->dev->ifindex,
4148 ifp->prefix_len,
4149 ifp->scope,
971a351c 4150 (u8) ifp->flags,
1da177e4
LT		 4151 ifp->idev->dev->name);
4152 return 0;
4153}
4154
56b3d975 4155static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4156 .start = if6_seq_start,
4157 .next = if6_seq_next,
4158 .show = if6_seq_show,
4159 .stop = if6_seq_stop,
4160};
4161
4162static int if6_seq_open(struct inode *inode, struct file *file)
4163{
3c40090a
DL		 4164 return seq_open_net(inode, file, &if6_seq_ops,
4165 sizeof(struct if6_iter_state));
1da177e4
LT		 4166}
4167
9a32144e 4168static const struct file_operations if6_fops = {
1da177e4
LT		 4169 .owner = THIS_MODULE,
4170 .open = if6_seq_open,
4171 .read = seq_read,
4172 .llseek = seq_lseek,
3c40090a 4173 .release = seq_release_net,
1da177e4
LT		 4174};
4175
2c8c1e72 4176static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4177{
d4beaa66 4178 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 4179 return -ENOMEM;
4180 return 0;
4181}
4182
2c8c1e72 4183static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4184{
ece31ffd 4185 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4186}
4187
4188static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4189 .init = if6_proc_net_init,
4190 .exit = if6_proc_net_exit,
3c40090a
DL		 4191};
4192
4193int __init if6_proc_init(void)
4194{
4195 return register_pernet_subsys(&if6_proc_net_ops);
4196}
4197
1da177e4
LT		 4198void if6_proc_exit(void)
4199{
3c40090a 4200 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4201}
4202#endif /* CONFIG_PROC_FS */
4203
07a93626 4204#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4205/* Check if address is a home address configured on any interface. */
b71d1d42 4206int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 4207{
4208 int ret = 0;
c2e21293 4209 struct inet6_ifaddr *ifp = NULL;
ddbe5032 4210 unsigned int hash = inet6_addr_hash(addr);
c2e21293 4211
5c578aed 4212 rcu_read_lock_bh();
b67bfe0d 4213 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 4214 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 4215 continue;
caad295f 4216 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4217 (ifp->flags & IFA_F_HOMEADDRESS)) {
4218 ret = 1;
4219 break;
4220 }
4221 }
5c578aed 4222 rcu_read_unlock_bh();
3b9f9a1c
NT		 4223 return ret;
4224}
4225#endif
4226
1da177e4
LT		 4227/*
4228 * Periodic address status verification
4229 */
4230
c15b1cca 4231static void addrconf_verify_rtnl(void)
1da177e4 4232{
b2db7564 4233 unsigned long now, next, next_sec, next_sched;
1da177e4 4234 struct inet6_ifaddr *ifp;
1da177e4
LT		 4235 int i;
4236
c15b1cca
HFS		 4237 ASSERT_RTNL();
4238
5c578aed 4239 rcu_read_lock_bh();
1da177e4 4240 now = jiffies;
b2db7564 4241 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4242
c15b1cca 4243 cancel_delayed_work(&addr_chk_work);
1da177e4 4244
bcdd553f 4245 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4246restart:
c15b1cca 4247 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 4248 unsigned long age;
1da177e4 4249
fad8da3e
YA		 4250 /* When setting preferred_lft to a value not zero or
4251 * infinity, while valid_lft is infinity
4252 * IFA_F_PERMANENT has a non-infinity life time.
4253 */
4254 if ((ifp->flags & IFA_F_PERMANENT) &&
4255 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4256 continue;
4257
4258 spin_lock(&ifp->lock);
b2db7564
YH		 4259 /* We try to batch several events at once. */
4260 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4261
8f27ebb9
YH		 4262 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4263 age >= ifp->valid_lft) {
1da177e4
LT		 4264 spin_unlock(&ifp->lock);
4265 in6_ifa_hold(ifp);
1da177e4
LT		 4266 ipv6_del_addr(ifp);
4267 goto restart;
8f27ebb9
YH		 4268 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4269 spin_unlock(&ifp->lock);
4270 continue;
1da177e4 4271 } else if (age >= ifp->prefered_lft) {
a1ed0526 4272 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4273 int deprecate = 0;
4274
4275 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4276 deprecate = 1;
4277 ifp->flags |= IFA_F_DEPRECATED;
4278 }
4279
fad8da3e
YA		 4280 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4281 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4282 next = ifp->tstamp + ifp->valid_lft * HZ;
4283
4284 spin_unlock(&ifp->lock);
4285
4286 if (deprecate) {
4287 in6_ifa_hold(ifp);
1da177e4
LT		 4288
4289 ipv6_ifa_notify(0, ifp);
4290 in6_ifa_put(ifp);
4291 goto restart;
4292 }
1da177e4
LT		 4293 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4294 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4295 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4296 ifp->idev->cnf.dad_transmits *
1f9248e5 4297 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 4298
1da177e4
LT		 4299 if (age >= ifp->prefered_lft - regen_advance) {
4300 struct inet6_ifaddr *ifpub = ifp->ifpub;
4301 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4302 next = ifp->tstamp + ifp->prefered_lft * HZ;
4303 if (!ifp->regen_count && ifpub) {
4304 ifp->regen_count++;
4305 in6_ifa_hold(ifp);
4306 in6_ifa_hold(ifpub);
4307 spin_unlock(&ifp->lock);
5c578aed 4308
291d809b
HY		 4309 spin_lock(&ifpub->lock);
4310 ifpub->regen_count = 0;
4311 spin_unlock(&ifpub->lock);
1da177e4
LT		 4312 ipv6_create_tempaddr(ifpub, ifp);
4313 in6_ifa_put(ifpub);
4314 in6_ifa_put(ifp);
4315 goto restart;
4316 }
4317 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4318 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4319 spin_unlock(&ifp->lock);
1da177e4
LT		 4320 } else {
4321 /* ifp->prefered_lft <= ifp->valid_lft */
4322 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4323 next = ifp->tstamp + ifp->prefered_lft * HZ;
4324 spin_unlock(&ifp->lock);
4325 }
4326 }
1da177e4
LT		 4327 }
4328
b2db7564
YH		 4329 next_sec = round_jiffies_up(next);
4330 next_sched = next;
4331
4332 /* If rounded timeout is accurate enough, accept it. */
4333 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4334 next_sched = next_sec;
4335
4336 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4337 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4338 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4339
ba3542e1 4340 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4341 now, next, next_sec, next_sched);
c15b1cca 4342 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4343 rcu_read_unlock_bh();
1da177e4
LT		 4344}
4345
c15b1cca
HFS		 4346static void addrconf_verify_work(struct work_struct *w)
4347{
4348 rtnl_lock();
4349 addrconf_verify_rtnl();
4350 rtnl_unlock();
4351}
4352
4353static void addrconf_verify(void)
4354{
4355 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4356}
4357
caeaba79
ND		 4358static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4359 struct in6_addr **peer_pfx)
461d8837
TG		 4360{
4361 struct in6_addr *pfx = NULL;
4362
caeaba79
ND		 4363 *peer_pfx = NULL;
4364
461d8837
TG		 4365 if (addr)
4366 pfx = nla_data(addr);
4367
4368 if (local) {
4369 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4370 *peer_pfx = pfx;
4371 pfx = nla_data(local);
461d8837
TG		 4372 }
4373
4374 return pfx;
4375}
4376
ef7c79ed 4377static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4378 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4379 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4380 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4381 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 4382};
4383
1da177e4 4384static int
661d2967 4385inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4386{
3b1e0a65 4387 struct net *net = sock_net(skb->sk);
b933f716
TG		 4388 struct ifaddrmsg *ifm;
4389 struct nlattr *tb[IFA_MAX+1];
caeaba79 4390 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4391 u32 ifa_flags;
b933f716 4392 int err;
1da177e4 4393
b933f716
TG		 4394 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4395 if (err < 0)
4396 return err;
4397
4398 ifm = nlmsg_data(nlh);
caeaba79 4399 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4400 if (!pfx)
1da177e4
LT		 4401 return -EINVAL;
4402
6046d5b4
HK		 4403 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4404
4405 /* We ignore other flags so far. */
4406 ifa_flags &= IFA_F_MANAGETEMPADDR;
4407
4408 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4409 ifm->ifa_prefixlen);
1da177e4
LT		 4410}
4411
479840ff 4412static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 4413 u32 prefered_lft, u32 valid_lft)
081bba5b 4414{
6f704992
YH		 4415 u32 flags;
4416 clock_t expires;
4bed72e4 4417 unsigned long timeout;
53bd6749 4418 bool was_managetempaddr;
5b84efec 4419 bool had_prefixroute;
46d48046 4420
c15b1cca
HFS		 4421 ASSERT_RTNL();
4422
081bba5b
NT		 4423 if (!valid_lft || (prefered_lft > valid_lft))
4424 return -EINVAL;
4425
53bd6749
JP		 4426 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4427 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4428 return -EINVAL;
4429
4bed72e4
YH		 4430 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4431 if (addrconf_finite_timeout(timeout)) {
4432 expires = jiffies_to_clock_t(timeout * HZ);
4433 valid_lft = timeout;
6f704992 4434 flags = RTF_EXPIRES;
4bed72e4
YH		 4435 } else {
4436 expires = 0;
4437 flags = 0;
4438 ifa_flags |= IFA_F_PERMANENT;
6f704992 4439 }
081bba5b 4440
4bed72e4
YH		 4441 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4442 if (addrconf_finite_timeout(timeout)) {
4443 if (timeout == 0)
4444 ifa_flags |= IFA_F_DEPRECATED;
4445 prefered_lft = timeout;
4446 }
081bba5b
NT		 4447
4448 spin_lock_bh(&ifp->lock);
53bd6749 4449 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4450 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4451 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4452 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4453 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4454 IFA_F_NOPREFIXROUTE);
53bd6749 4455 ifp->flags |= ifa_flags;
081bba5b
NT		 4456 ifp->tstamp = jiffies;
4457 ifp->valid_lft = valid_lft;
4458 ifp->prefered_lft = prefered_lft;
4459
4460 spin_unlock_bh(&ifp->lock);
4461 if (!(ifp->flags&IFA_F_TENTATIVE))
4462 ipv6_ifa_notify(0, ifp);
081bba5b 4463
761aac73
TH		 4464 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4465 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4466 expires, flags);
5b84efec
TH		 4467 } else if (had_prefixroute) {
4468 enum cleanup_prefix_rt_t action;
4469 unsigned long rt_expires;
4470
4471 write_lock_bh(&ifp->idev->lock);
4472 action = check_cleanup_prefix_route(ifp, &rt_expires);
4473 write_unlock_bh(&ifp->idev->lock);
4474
4475 if (action != CLEANUP_PREFIX_RT_NOP) {
4476 cleanup_prefix_route(ifp, rt_expires,
4477 action == CLEANUP_PREFIX_RT_DEL);
4478 }
761aac73 4479 }
53bd6749
JP		 4480
4481 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4482 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4483 valid_lft = prefered_lft = 0;
4484 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4485 !was_managetempaddr, jiffies);
4486 }
4487
c15b1cca 4488 addrconf_verify_rtnl();
081bba5b
NT		 4489
4490 return 0;
4491}
4492
1da177e4 4493static int
661d2967 4494inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4495{
3b1e0a65 4496 struct net *net = sock_net(skb->sk);
461d8837
TG		 4497 struct ifaddrmsg *ifm;
4498 struct nlattr *tb[IFA_MAX+1];
caeaba79 4499 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 4500 struct inet6_ifaddr *ifa;
4501 struct net_device *dev;
55ebaef1 4502 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 4503 u32 ifa_flags;
461d8837 4504 int err;
1da177e4 4505
461d8837
TG		 4506 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4507 if (err < 0)
4508 return err;
4509
4510 ifm = nlmsg_data(nlh);
caeaba79 4511 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4512 if (!pfx)
1da177e4
LT		 4513 return -EINVAL;
4514
461d8837 4515 if (tb[IFA_CACHEINFO]) {
0778769d 4516 struct ifa_cacheinfo *ci;
461d8837
TG		 4517
4518 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 4519 valid_lft = ci->ifa_valid;
461d8837
TG		 4520 preferred_lft = ci->ifa_prefered;
4521 } else {
4522 preferred_lft = INFINITY_LIFE_TIME;
4523 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 4524 }
4525
af284937 4526 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4527 if (!dev)
7198f8ce
TG		 4528 return -ENODEV;
4529
479840ff
JP		 4530 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4531
55ebaef1 4532 /* We ignore other flags so far. */
761aac73 4533 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
93a714d6 4534 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
55ebaef1 4535
1cab3da6 4536 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
63159f29 4537 if (!ifa) {
7198f8ce
TG		 4538 /*
4539 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4540 * userspace already relies on not having to provide this.
7198f8ce 4541 */
caeaba79 4542 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 4543 ifm->ifa_prefixlen, ifa_flags,
4544 preferred_lft, valid_lft);
081bba5b
NT		 4545 }
4546
7198f8ce
TG		 4547 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4548 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4549 err = -EEXIST;
4550 else
55ebaef1 4551 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 4552
4553 in6_ifa_put(ifa);
4554
4555 return err;
1da177e4
LT		 4556}
4557
479840ff 4558static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4559 u8 scope, int ifindex)
4560{
4561 struct ifaddrmsg *ifm;
4562
4563 ifm = nlmsg_data(nlh);
4564 ifm->ifa_family = AF_INET6;
4565 ifm->ifa_prefixlen = prefixlen;
4566 ifm->ifa_flags = flags;
4567 ifm->ifa_scope = scope;
4568 ifm->ifa_index = ifindex;
4569}
4570
85486af0
TG		 4571static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4572 unsigned long tstamp, u32 preferred, u32 valid)
4573{
4574 struct ifa_cacheinfo ci;
4575
18a31e1e
TG		 4576 ci.cstamp = cstamp_delta(cstamp);
4577 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4578 ci.ifa_prefered = preferred;
4579 ci.ifa_valid = valid;
4580
4581 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4582}
4583
101bb229
TG		 4584static inline int rt_scope(int ifa_scope)
4585{
4586 if (ifa_scope & IFA_HOST)
4587 return RT_SCOPE_HOST;
4588 else if (ifa_scope & IFA_LINK)
4589 return RT_SCOPE_LINK;
4590 else if (ifa_scope & IFA_SITE)
4591 return RT_SCOPE_SITE;
4592 else
4593 return RT_SCOPE_UNIVERSE;
4594}
4595
0ab6803b
TG		 4596static inline int inet6_ifaddr_msgsize(void)
4597{
339bf98f 4598 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4599 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4600 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4601 + nla_total_size(sizeof(struct ifa_cacheinfo))
4602 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4603}
c5396a31 4604
1da177e4 4605static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4606 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4607{
1da177e4 4608 struct nlmsghdr *nlh;
85486af0 4609 u32 preferred, valid;
1da177e4 4610
15e47304 4611 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4612 if (!nlh)
26932566 4613 return -EMSGSIZE;
0ab6803b 4614
101bb229
TG		 4615 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4616 ifa->idev->dev->ifindex);
4617
fad8da3e
YA		 4618 if (!((ifa->flags&IFA_F_PERMANENT) &&
4619 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4620 preferred = ifa->prefered_lft;
4621 valid = ifa->valid_lft;
4622 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4623 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4624 if (preferred > tval)
4625 preferred -= tval;
4626 else
4627 preferred = 0;
f56619fc
BH		 4628 if (valid != INFINITY_LIFE_TIME) {
4629 if (valid > tval)
4630 valid -= tval;
4631 else
4632 valid = 0;
4633 }
1da177e4
LT		 4634 }
4635 } else {
85486af0
TG		 4636 preferred = INFINITY_LIFE_TIME;
4637 valid = INFINITY_LIFE_TIME;
4638 }
4639
7996c799 4640 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4641 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4642 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4643 goto error;
4644 } else
930345ea 4645 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4646 goto error;
4647
4648 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4649 goto error;
1da177e4 4650
479840ff
JP		 4651 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4652 goto error;
4653
053c095a
JB		 4654 nlmsg_end(skb, nlh);
4655 return 0;
caeaba79
ND		 4656
4657error:
4658 nlmsg_cancel(skb, nlh);
4659 return -EMSGSIZE;
1da177e4
LT		 4660}
4661
4662static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4663 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4664{
1da177e4 4665 struct nlmsghdr *nlh;
101bb229
TG		 4666 u8 scope = RT_SCOPE_UNIVERSE;
4667 int ifindex = ifmca->idev->dev->ifindex;
4668
4669 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4670 scope = RT_SCOPE_SITE;
1da177e4 4671
15e47304 4672 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4673 if (!nlh)
26932566 4674 return -EMSGSIZE;
85486af0 4675
0ab6803b 4676 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4677 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4678 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4679 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4680 nlmsg_cancel(skb, nlh);
4681 return -EMSGSIZE;
4682 }
85486af0 4683
053c095a
JB		 4684 nlmsg_end(skb, nlh);
4685 return 0;
1da177e4
LT		 4686}
4687
4688static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4689 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4690{
1da177e4 4691 struct nlmsghdr *nlh;
101bb229
TG		 4692 u8 scope = RT_SCOPE_UNIVERSE;
4693 int ifindex = ifaca->aca_idev->dev->ifindex;
4694
4695 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4696 scope = RT_SCOPE_SITE;
1da177e4 4697
15e47304 4698 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4699 if (!nlh)
26932566 4700 return -EMSGSIZE;
85486af0 4701
0ab6803b 4702 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4703 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4704 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4705 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4706 nlmsg_cancel(skb, nlh);
4707 return -EMSGSIZE;
4708 }
1da177e4 4709
053c095a
JB		 4710 nlmsg_end(skb, nlh);
4711 return 0;
1da177e4
LT		 4712}
4713
e21e8467 4714enum addr_type_t {
1da177e4
LT		 4715 UNICAST_ADDR,
4716 MULTICAST_ADDR,
4717 ANYCAST_ADDR,
4718};
4719
234b27c3
ED		 4720/* called with rcu_read_lock() */
4721static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4722 struct netlink_callback *cb, enum addr_type_t type,
4723 int s_ip_idx, int *p_ip_idx)
4724{
234b27c3
ED		 4725 struct ifmcaddr6 *ifmca;
4726 struct ifacaddr6 *ifaca;
4727 int err = 1;
4728 int ip_idx = *p_ip_idx;
4729
4730 read_lock_bh(&idev->lock);
4731 switch (type) {
502a2ffd 4732 case UNICAST_ADDR: {
4733 struct inet6_ifaddr *ifa;
4734
234b27c3 4735 /* unicast address incl. temp addr */
502a2ffd 4736 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4737 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4738 continue;
4739 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4740 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4741 cb->nlh->nlmsg_seq,
4742 RTM_NEWADDR,
4743 NLM_F_MULTI);
053c095a 4744 if (err < 0)
234b27c3 4745 break;
63998ac2 4746 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4747 }
4748 break;
502a2ffd 4749 }
234b27c3
ED		 4750 case MULTICAST_ADDR:
4751 /* multicast address */
4752 for (ifmca = idev->mc_list; ifmca;
4753 ifmca = ifmca->next, ip_idx++) {
4754 if (ip_idx < s_ip_idx)
4755 continue;
4756 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4757 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4758 cb->nlh->nlmsg_seq,
4759 RTM_GETMULTICAST,
4760 NLM_F_MULTI);
053c095a 4761 if (err < 0)
234b27c3
ED		 4762 break;
4763 }
4764 break;
4765 case ANYCAST_ADDR:
4766 /* anycast address */
4767 for (ifaca = idev->ac_list; ifaca;
4768 ifaca = ifaca->aca_next, ip_idx++) {
4769 if (ip_idx < s_ip_idx)
4770 continue;
4771 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4772 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4773 cb->nlh->nlmsg_seq,
4774 RTM_GETANYCAST,
4775 NLM_F_MULTI);
053c095a 4776 if (err < 0)
234b27c3
ED		 4777 break;
4778 }
4779 break;
4780 default:
4781 break;
4782 }
4783 read_unlock_bh(&idev->lock);
4784 *p_ip_idx = ip_idx;
4785 return err;
4786}
4787
1da177e4
LT		 4788static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4789 enum addr_type_t type)
4790{
234b27c3
ED		 4791 struct net *net = sock_net(skb->sk);
4792 int h, s_h;
1da177e4
LT		 4793 int idx, ip_idx;
4794 int s_idx, s_ip_idx;
1da177e4 4795 struct net_device *dev;
234b27c3
ED		 4796 struct inet6_dev *idev;
4797 struct hlist_head *head;
1ab1457c 4798
234b27c3
ED		 4799 s_h = cb->args[0];
4800 s_idx = idx = cb->args[1];
4801 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4802
234b27c3 4803 rcu_read_lock();
63998ac2 4804 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4805 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4806 idx = 0;
4807 head = &net->dev_index_head[h];
b67bfe0d 4808 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4809 if (idx < s_idx)
4810 goto cont;
4b97efdf 4811 if (h > s_h || idx > s_idx)
234b27c3
ED		 4812 s_ip_idx = 0;
4813 ip_idx = 0;
e21e8467
SH		 4814 idev = __in6_dev_get(dev);
4815 if (!idev)
234b27c3
ED		 4816 goto cont;
4817
4818 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4819 s_ip_idx, &ip_idx) < 0)
234b27c3 4820 goto done;
7562f876 4821cont:
234b27c3
ED		 4822 idx++;
4823 }
1da177e4 4824 }
234b27c3
ED		 4825done:
4826 rcu_read_unlock();
4827 cb->args[0] = h;
4828 cb->args[1] = idx;
4829 cb->args[2] = ip_idx;
4830
1da177e4
LT		 4831 return skb->len;
4832}
4833
4834static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4835{
4836 enum addr_type_t type = UNICAST_ADDR;
b854272b 4837
1da177e4
LT		 4838 return inet6_dump_addr(skb, cb, type);
4839}
4840
4841static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4842{
4843 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4844
1da177e4
LT		 4845 return inet6_dump_addr(skb, cb, type);
4846}
4847
4848
4849static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4850{
4851 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4852
1da177e4
LT		 4853 return inet6_dump_addr(skb, cb, type);
4854}
4855
661d2967 4856static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4857{
3b1e0a65 4858 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4859 struct ifaddrmsg *ifm;
4860 struct nlattr *tb[IFA_MAX+1];
caeaba79 4861 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4862 struct net_device *dev = NULL;
4863 struct inet6_ifaddr *ifa;
4864 struct sk_buff *skb;
6c223828
NT		 4865 int err;
4866
1b29fc2c
TG		 4867 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4868 if (err < 0)
4869 goto errout;
4870
caeaba79 4871 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
63159f29 4872 if (!addr) {
1b29fc2c
TG		 4873 err = -EINVAL;
4874 goto errout;
6c223828 4875 }
6c223828 4876
1b29fc2c 4877 ifm = nlmsg_data(nlh);
6c223828 4878 if (ifm->ifa_index)
6fda7350 4879 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4880
e21e8467
SH		 4881 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4882 if (!ifa) {
1b29fc2c
TG		 4883 err = -EADDRNOTAVAIL;
4884 goto errout;
4885 }
6c223828 4886
e21e8467
SH		 4887 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4888 if (!skb) {
6c223828 4889 err = -ENOBUFS;
1b29fc2c 4890 goto errout_ifa;
6c223828
NT		 4891 }
4892
15e47304 4893 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4894 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4895 if (err < 0) {
4896 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4897 WARN_ON(err == -EMSGSIZE);
4898 kfree_skb(skb);
4899 goto errout_ifa;
4900 }
15e47304 4901 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4902errout_ifa:
6c223828 4903 in6_ifa_put(ifa);
1b29fc2c 4904errout:
6c223828 4905 return err;
6c223828
NT		 4906}
4907
1da177e4
LT		 4908static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4909{
4910 struct sk_buff *skb;
c346dca1 4911 struct net *net = dev_net(ifa->idev->dev);
5d620266 4912 int err = -ENOBUFS;
1da177e4 4913
f784ad3d
MB		 4914 /* Don't send DELADDR notification for TENTATIVE address,
4915 * since NEWADDR notification is sent only after removing
4916 * TENTATIVE flag.
4917 */
4918 if (ifa->flags & IFA_F_TENTATIVE && event == RTM_DELADDR)
4919 return;
4920
0ab6803b 4921 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 4922 if (!skb)
5d620266
TG		 4923 goto errout;
4924
4925 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4926 if (err < 0) {
4927 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4928 WARN_ON(err == -EMSGSIZE);
4929 kfree_skb(skb);
4930 goto errout;
4931 }
1ce85fe4
PNA		 4932 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4933 return;
5d620266
TG		 4934errout:
4935 if (err < 0)
6fda7350 4936 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4937}
4938
b6f99a21 4939static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4940 __s32 *array, int bytes)
4941{
04561c1f
TG		 4942 BUG_ON(bytes < (DEVCONF_MAX * 4));
4943
1da177e4
LT		 4944 memset(array, 0, bytes);
4945 array[DEVCONF_FORWARDING] = cnf->forwarding;
4946 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4947 array[DEVCONF_MTU6] = cnf->mtu6;
4948 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4949 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4950 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4951 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4952 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4953 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4954 jiffies_to_msecs(cnf->rtr_solicit_interval);
bd11f074
MŻ		 4955 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
4956 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
93908d19
TG		 4957 array[DEVCONF_RTR_SOLICIT_DELAY] =
4958 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4959 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4960 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4961 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4962 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4963 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4964 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4965 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4966 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4967 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4968 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4969 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4970 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 4971 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 4972 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4973#ifdef CONFIG_IPV6_ROUTER_PREF
4974 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4975 array[DEVCONF_RTR_PROBE_INTERVAL] =
4976 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4977#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4978 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4979#endif
930d6ff2 4980#endif
fbea49e1 4981 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4982 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4983#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4984 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 4985 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 4986#endif
7bc570c8
YH		 4987#ifdef CONFIG_IPV6_MROUTE
4988 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4989#endif
778d80be 4990 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4991 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4992 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4993 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 4994 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 4995 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 4996 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 4997 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 4998 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 4999 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 5000 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 5001 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 5002 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1ababeba 5003 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
bf355b8d
DL		 5004#ifdef CONFIG_IPV6_SEG6_HMAC
5005 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5006#endif
adc176c5 5007 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
d35a00b8 5008 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
1da177e4
LT		 5009}
5010
b382b191
TG		 5011static inline size_t inet6_ifla6_size(void)
5012{
5013 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5014 + nla_total_size(sizeof(struct ifla_cacheinfo))
5015 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5016 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 5017 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5018 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 5019}
5020
339bf98f
TG		 5021static inline size_t inet6_if_nlmsg_size(void)
5022{
5023 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5024 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5025 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5026 + nla_total_size(4) /* IFLA_MTU */
5027 + nla_total_size(4) /* IFLA_LINK */
0344338b 5028 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 5029 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 5030}
c5396a31 5031
be281e55 5032static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
aca05671 5033 int bytes)
7f7d9a6b
HX		 5034{
5035 int i;
aca05671 5036 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
7f7d9a6b
HX		 5037 BUG_ON(pad < 0);
5038
5039 /* Use put_unaligned() because stats may not be aligned for u64. */
aca05671
JH		 5040 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5041 for (i = 1; i < ICMP6_MIB_MAX; i++)
be281e55 5042 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b 5043
aca05671 5044 memset(&stats[ICMP6_MIB_MAX], 0, pad);
7f7d9a6b
HX		 5045}
5046
698365fa 5047static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 5048 int bytes, size_t syncpoff)
4ce3c183 5049{
a3a77372
R		 5050 int i, c;
5051 u64 buff[IPSTATS_MIB_MAX];
5052 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5053
4ce3c183
ED		 5054 BUG_ON(pad < 0);
5055
a3a77372
R		 5056 memset(buff, 0, sizeof(buff));
5057 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 5058
a3a77372
R		 5059 for_each_possible_cpu(c) {
5060 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5061 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5062 }
5063
5064 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5065 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 5066}
5067
7f7d9a6b
HX		 5068static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5069 int bytes)
5070{
e21e8467 5071 switch (attrtype) {
7f7d9a6b 5072 case IFLA_INET6_STATS:
a3a77372
R		 5073 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5074 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 5075 break;
5076 case IFLA_INET6_ICMP6STATS:
aca05671 5077 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
7f7d9a6b
HX		 5078 break;
5079 }
5080}
5081
d5566fd7
SV		 5082static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5083 u32 ext_filter_mask)
b382b191
TG		 5084{
5085 struct nlattr *nla;
5086 struct ifla_cacheinfo ci;
5087
c78679e8
DM		 5088 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5089 goto nla_put_failure;
b382b191 5090 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 5091 ci.tstamp = cstamp_delta(idev->tstamp);
5092 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 5093 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 5094 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5095 goto nla_put_failure;
b382b191 5096 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 5097 if (!nla)
b382b191
TG		 5098 goto nla_put_failure;
5099 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5100
5101 /* XXX - MC not implemented */
5102
d5566fd7
SV		 5103 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5104 return 0;
5105
b382b191 5106 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 5107 if (!nla)
b382b191
TG		 5108 goto nla_put_failure;
5109 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5110
5111 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 5112 if (!nla)
b382b191
TG		 5113 goto nla_put_failure;
5114 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5115
f53adae4 5116 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 5117 if (!nla)
f53adae4 5118 goto nla_put_failure;
bc91b0f0 5119
d35a00b8 5120 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
bc91b0f0
JP		 5121 goto nla_put_failure;
5122
f53adae4
DB		 5123 read_lock_bh(&idev->lock);
5124 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5125 read_unlock_bh(&idev->lock);
5126
b382b191
TG		 5127 return 0;
5128
5129nla_put_failure:
5130 return -EMSGSIZE;
5131}
5132
b1974ed0
AR		 5133static size_t inet6_get_link_af_size(const struct net_device *dev,
5134 u32 ext_filter_mask)
b382b191
TG		 5135{
5136 if (!__in6_dev_get(dev))
5137 return 0;
5138
5139 return inet6_ifla6_size();
5140}
5141
d5566fd7
SV		 5142static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5143 u32 ext_filter_mask)
b382b191
TG		 5144{
5145 struct inet6_dev *idev = __in6_dev_get(dev);
5146
5147 if (!idev)
5148 return -ENODATA;
5149
d5566fd7 5150 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5151 return -EMSGSIZE;
5152
5153 return 0;
5154}
5155
f53adae4
DB		 5156static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5157{
f53adae4
DB		 5158 struct inet6_ifaddr *ifp;
5159 struct net_device *dev = idev->dev;
47e27d5e 5160 bool clear_token, update_rs = false;
dc848292 5161 struct in6_addr ll_addr;
f53adae4 5162
c15b1cca
HFS		 5163 ASSERT_RTNL();
5164
63159f29 5165 if (!token)
f53adae4 5166 return -EINVAL;
f53adae4
DB		 5167 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5168 return -EINVAL;
f53adae4
DB		 5169 if (!ipv6_accept_ra(idev))
5170 return -EINVAL;
bd11f074 5171 if (idev->cnf.rtr_solicits == 0)
f53adae4
DB		 5172 return -EINVAL;
5173
5174 write_lock_bh(&idev->lock);
5175
5176 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5177 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5178
5179 write_unlock_bh(&idev->lock);
5180
47e27d5e
DB		 5181 clear_token = ipv6_addr_any(token);
5182 if (clear_token)
5183 goto update_lft;
5184
dc848292
HFS		 5185 if (!idev->dead && (idev->if_flags & IF_READY) &&
5186 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5187 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5188 /* If we're not ready, then normal ifup will take care
5189 * of this. Otherwise, we need to request our rs here.
5190 */
5191 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5192 update_rs = true;
5193 }
f53adae4 5194
47e27d5e 5195update_lft:
f53adae4 5196 write_lock_bh(&idev->lock);
fc403832 5197
77ecaace 5198 if (update_rs) {
fc403832 5199 idev->if_flags |= IF_RS_SENT;
bd11f074
MŻ		 5200 idev->rs_interval = rfc3315_s14_backoff_init(
5201 idev->cnf.rtr_solicit_interval);
77ecaace 5202 idev->rs_probes = 1;
bd11f074 5203 addrconf_mod_rs_timer(idev, idev->rs_interval);
77ecaace 5204 }
f53adae4
DB		 5205
5206 /* Well, that's kinda nasty ... */
5207 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5208 spin_lock(&ifp->lock);
617fe29d 5209 if (ifp->tokenized) {
f53adae4
DB		 5210 ifp->valid_lft = 0;
5211 ifp->prefered_lft = 0;
5212 }
5213 spin_unlock(&ifp->lock);
5214 }
5215
5216 write_unlock_bh(&idev->lock);
b2ed64a9 5217 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 5218 addrconf_verify_rtnl();
f53adae4
DB		 5219 return 0;
5220}
5221
11b1f828
DB		 5222static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5223 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5224 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5225};
5226
5227static int inet6_validate_link_af(const struct net_device *dev,
5228 const struct nlattr *nla)
5229{
5230 struct nlattr *tb[IFLA_INET6_MAX + 1];
5231
5232 if (dev && !__in6_dev_get(dev))
5233 return -EAFNOSUPPORT;
5234
5235 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5236}
5237
d35a00b8
FJ		 5238static int check_addr_gen_mode(int mode)
5239{
5240 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5241 mode != IN6_ADDR_GEN_MODE_NONE &&
5242 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5243 mode != IN6_ADDR_GEN_MODE_RANDOM)
5244 return -EINVAL;
5245 return 1;
5246}
5247
5248static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5249 int mode)
5250{
5251 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5252 !idev->cnf.stable_secret.initialized &&
5253 !net->ipv6.devconf_dflt->stable_secret.initialized)
5254 return -EINVAL;
5255 return 1;
5256}
5257
f53adae4
DB		 5258static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5259{
5260 int err = -EINVAL;
5261 struct inet6_dev *idev = __in6_dev_get(dev);
5262 struct nlattr *tb[IFLA_INET6_MAX + 1];
5263
5264 if (!idev)
5265 return -EAFNOSUPPORT;
5266
5267 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5268 BUG();
5269
bc91b0f0 5270 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 5271 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 5272 if (err)
5273 return err;
5274 }
5275
5276 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5277 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5278
d35a00b8
FJ		 5279 if (check_addr_gen_mode(mode) < 0 ||
5280 check_stable_privacy(idev, dev_net(dev), mode) < 0)
bc91b0f0 5281 return -EINVAL;
622c81d5 5282
d35a00b8 5283 idev->cnf.addr_gen_mode = mode;
bc91b0f0
JP		 5284 err = 0;
5285 }
f53adae4
DB		 5286
5287 return err;
5288}
5289
1ab1457c 5290static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5291 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5292{
04561c1f 5293 struct net_device *dev = idev->dev;
04561c1f
TG		 5294 struct ifinfomsg *hdr;
5295 struct nlmsghdr *nlh;
5296 void *protoinfo;
04561c1f 5297
15e47304 5298 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5299 if (!nlh)
26932566 5300 return -EMSGSIZE;
04561c1f
TG		 5301
5302 hdr = nlmsg_data(nlh);
5303 hdr->ifi_family = AF_INET6;
5304 hdr->__ifi_pad = 0;
5305 hdr->ifi_type = dev->type;
5306 hdr->ifi_index = dev->ifindex;
5307 hdr->ifi_flags = dev_get_flags(dev);
5308 hdr->ifi_change = 0;
5309
c78679e8
DM		 5310 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5311 (dev->addr_len &&
5312 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5313 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5314 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5315 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5316 nla_put_u8(skb, IFLA_OPERSTATE,
5317 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5318 goto nla_put_failure;
04561c1f 5319 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 5320 if (!protoinfo)
04561c1f 5321 goto nla_put_failure;
1da177e4 5322
d5566fd7 5323 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5324 goto nla_put_failure;
1da177e4 5325
04561c1f 5326 nla_nest_end(skb, protoinfo);
053c095a
JB		 5327 nlmsg_end(skb, nlh);
5328 return 0;
1da177e4 5329
04561c1f 5330nla_put_failure:
26932566
PM		 5331 nlmsg_cancel(skb, nlh);
5332 return -EMSGSIZE;
1da177e4
LT		 5333}
5334
5335static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5336{
3b1e0a65 5337 struct net *net = sock_net(skb->sk);
84d2697d 5338 int h, s_h;
434a8a58 5339 int idx = 0, s_idx;
1da177e4
LT		 5340 struct net_device *dev;
5341 struct inet6_dev *idev;
84d2697d 5342 struct hlist_head *head;
1da177e4 5343
84d2697d
ED		 5344 s_h = cb->args[0];
5345 s_idx = cb->args[1];
5346
5347 rcu_read_lock();
5348 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5349 idx = 0;
5350 head = &net->dev_index_head[h];
b67bfe0d 5351 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5352 if (idx < s_idx)
5353 goto cont;
5354 idev = __in6_dev_get(dev);
5355 if (!idev)
5356 goto cont;
5357 if (inet6_fill_ifinfo(skb, idev,
15e47304 5358 NETLINK_CB(cb->skb).portid,
84d2697d 5359 cb->nlh->nlmsg_seq,
053c095a 5360 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5361 goto out;
7562f876 5362cont:
84d2697d
ED		 5363 idx++;
5364 }
1da177e4 5365 }
84d2697d
ED		 5366out:
5367 rcu_read_unlock();
5368 cb->args[1] = idx;
5369 cb->args[0] = h;
1da177e4
LT		 5370
5371 return skb->len;
5372}
5373
5374void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5375{
5376 struct sk_buff *skb;
c346dca1 5377 struct net *net = dev_net(idev->dev);
8d7a76c9 5378 int err = -ENOBUFS;
1ab1457c 5379
339bf98f 5380 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5381 if (!skb)
8d7a76c9
TG		 5382 goto errout;
5383
5384 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5385 if (err < 0) {
5386 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5387 WARN_ON(err == -EMSGSIZE);
5388 kfree_skb(skb);
5389 goto errout;
5390 }
5f75a104 5391 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5392 return;
8d7a76c9
TG		 5393errout:
5394 if (err < 0)
5f75a104 5395 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5396}
5397
339bf98f
TG		 5398static inline size_t inet6_prefix_nlmsg_size(void)
5399{
5400 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5401 + nla_total_size(sizeof(struct in6_addr))
5402 + nla_total_size(sizeof(struct prefix_cacheinfo));
5403}
c5396a31 5404
1da177e4 5405static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5406 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5407 int event, unsigned int flags)
1da177e4 5408{
6051e2f4
TG		 5409 struct prefixmsg *pmsg;
5410 struct nlmsghdr *nlh;
1da177e4
LT		 5411 struct prefix_cacheinfo ci;
5412
15e47304 5413 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5414 if (!nlh)
26932566 5415 return -EMSGSIZE;
6051e2f4
TG		 5416
5417 pmsg = nlmsg_data(nlh);
1da177e4 5418 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5419 pmsg->prefix_pad1 = 0;
5420 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5421 pmsg->prefix_ifindex = idev->dev->ifindex;
5422 pmsg->prefix_len = pinfo->prefix_len;
5423 pmsg->prefix_type = pinfo->type;
8a47077a 5424 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5425 pmsg->prefix_flags = 0;
5426 if (pinfo->onlink)
5427 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5428 if (pinfo->autoconf)
5429 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5430
c78679e8
DM		 5431 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5432 goto nla_put_failure;
1da177e4
LT		 5433 ci.preferred_time = ntohl(pinfo->prefered);
5434 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5435 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5436 goto nla_put_failure;
053c095a
JB		 5437 nlmsg_end(skb, nlh);
5438 return 0;
1da177e4 5439
6051e2f4 5440nla_put_failure:
26932566
PM		 5441 nlmsg_cancel(skb, nlh);
5442 return -EMSGSIZE;
1da177e4
LT		 5443}
5444
1ab1457c 5445static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5446 struct prefix_info *pinfo)
5447{
5448 struct sk_buff *skb;
c346dca1 5449 struct net *net = dev_net(idev->dev);
8c384bfa 5450 int err = -ENOBUFS;
1da177e4 5451
339bf98f 5452 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5453 if (!skb)
8c384bfa
TG		 5454 goto errout;
5455
5456 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5457 if (err < 0) {
5458 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5459 WARN_ON(err == -EMSGSIZE);
5460 kfree_skb(skb);
5461 goto errout;
5462 }
1ce85fe4
PNA		 5463 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5464 return;
8c384bfa
TG		 5465errout:
5466 if (err < 0)
6fda7350 5467 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5468}
5469
1da177e4
LT		 5470static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5471{
63998ac2
ND		 5472 struct net *net = dev_net(ifp->idev->dev);
5473
c15b1cca
HFS		 5474 if (event)
5475 ASSERT_RTNL();
5476
1da177e4
LT		 5477 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5478
5479 switch (event) {
5480 case RTM_NEWADDR:
95c385b4
NH		 5481 /*
5482 * If the address was optimistic
5483 * we inserted the route at the start of
5484 * our DAD process, so we don't need
5485 * to do it again
5486 */
5487 if (!(ifp->rt->rt6i_node))
5488 ip6_ins_rt(ifp->rt);
1da177e4
LT		 5489 if (ifp->idev->cnf.forwarding)
5490 addrconf_join_anycast(ifp);
7996c799 5491 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 5492 addrconf_prefix_route(&ifp->peer_addr, 128,
5493 ifp->idev->dev, 0, 0);
1da177e4
LT		 5494 break;
5495 case RTM_DELADDR:
5496 if (ifp->idev->cnf.forwarding)
5497 addrconf_leave_anycast(ifp);
5498 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5499 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 5500 struct rt6_info *rt;
caeaba79 5501
e7478dfc
ND		 5502 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5503 ifp->idev->dev, 0, 0);
8e3d5be7
MKL		 5504 if (rt)
5505 ip6_del_rt(rt);
caeaba79 5506 }
38bd10c4
DA		 5507 if (ifp->rt) {
5508 dst_hold(&ifp->rt->dst);
5509 ip6_del_rt(ifp->rt);
5510 }
705f1c86 5511 rt_genid_bump_ipv6(net);
1da177e4
LT		 5512 break;
5513 }
63998ac2 5514 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5515}
5516
5517static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5518{
8814c4b5 5519 rcu_read_lock_bh();
1da177e4
LT		 5520 if (likely(ifp->idev->dead == 0))
5521 __ipv6_ifa_notify(event, ifp);
8814c4b5 5522 rcu_read_unlock_bh();
1da177e4
LT		 5523}
5524
5525#ifdef CONFIG_SYSCTL
5526
5527static
fe2c6338 5528int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5529 void __user *buffer, size_t *lenp, loff_t *ppos)
5530{
5531 int *valp = ctl->data;
5532 int val = *valp;
88af182e 5533 loff_t pos = *ppos;
fe2c6338 5534 struct ctl_table lctl;
1da177e4
LT		 5535 int ret;
5536
013d97e9
FR		 5537 /*
5538 * ctl->data points to idev->cnf.forwarding, we should
5539 * not modify it until we get the rtnl lock.
5540 */
5541 lctl = *ctl;
5542 lctl.data = &val;
5543
5544 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5545
c8fecf22 5546 if (write)
b325fddb 5547 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5548 if (ret)
5549 *ppos = pos;
1ab1457c 5550 return ret;
1da177e4
LT		 5551}
5552
77751427
ML		 5553static
5554int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5555 void __user *buffer, size_t *lenp, loff_t *ppos)
5556{
5557 struct inet6_dev *idev = ctl->extra1;
5558 int min_mtu = IPV6_MIN_MTU;
5559 struct ctl_table lctl;
5560
5561 lctl = *ctl;
5562 lctl.extra1 = &min_mtu;
5563 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5564
5565 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5566}
5567
56d417b1
BH		 5568static void dev_disable_change(struct inet6_dev *idev)
5569{
75538c2b
CW		 5570 struct netdev_notifier_info info;
5571
56d417b1
BH		 5572 if (!idev || !idev->dev)
5573 return;
5574
75538c2b 5575 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5576 if (idev->cnf.disable_ipv6)
75538c2b 5577 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5578 else
75538c2b 5579 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5580}
5581
5582static void addrconf_disable_change(struct net *net, __s32 newf)
5583{
5584 struct net_device *dev;
5585 struct inet6_dev *idev;
5586
03e4deff 5587 for_each_netdev(net, dev) {
56d417b1
BH		 5588 idev = __in6_dev_get(dev);
5589 if (idev) {
5590 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5591 idev->cnf.disable_ipv6 = newf;
5592 if (changed)
5593 dev_disable_change(idev);
5594 }
56d417b1 5595 }
56d417b1
BH		 5596}
5597
013d97e9 5598static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5599{
5600 struct net *net;
013d97e9
FR		 5601 int old;
5602
5603 if (!rtnl_trylock())
5604 return restart_syscall();
56d417b1
BH		 5605
5606 net = (struct net *)table->extra2;
013d97e9
FR		 5607 old = *p;
5608 *p = newf;
56d417b1 5609
013d97e9
FR		 5610 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5611 rtnl_unlock();
56d417b1 5612 return 0;
88af182e 5613 }
56d417b1
BH		 5614
5615 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5616 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5617 addrconf_disable_change(net, newf);
013d97e9 5618 } else if ((!newf) ^ (!old))
56d417b1
BH		 5619 dev_disable_change((struct inet6_dev *)table->extra1);
5620
5621 rtnl_unlock();
5622 return 0;
5623}
5624
5625static
fe2c6338 5626int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5627 void __user *buffer, size_t *lenp, loff_t *ppos)
5628{
5629 int *valp = ctl->data;
5630 int val = *valp;
88af182e 5631 loff_t pos = *ppos;
fe2c6338 5632 struct ctl_table lctl;
56d417b1
BH		 5633 int ret;
5634
013d97e9
FR		 5635 /*
5636 * ctl->data points to idev->cnf.disable_ipv6, we should
5637 * not modify it until we get the rtnl lock.
5638 */
5639 lctl = *ctl;
5640 lctl.data = &val;
5641
5642 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5643
5644 if (write)
5645 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5646 if (ret)
5647 *ppos = pos;
56d417b1
BH		 5648 return ret;
5649}
5650
c92d5491 5651static
5652int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5653 void __user *buffer, size_t *lenp, loff_t *ppos)
5654{
5655 int *valp = ctl->data;
5656 int ret;
5657 int old, new;
5658
5659 old = *valp;
5660 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5661 new = *valp;
5662
5663 if (write && old != new) {
5664 struct net *net = ctl->extra2;
5665
5666 if (!rtnl_trylock())
5667 return restart_syscall();
5668
5669 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5670 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5671 NETCONFA_IFINDEX_DEFAULT,
5672 net->ipv6.devconf_dflt);
5673 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5674 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5675 NETCONFA_IFINDEX_ALL,
5676 net->ipv6.devconf_all);
5677 else {
5678 struct inet6_dev *idev = ctl->extra1;
5679
5680 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5681 idev->dev->ifindex,
5682 &idev->cnf);
5683 }
5684 rtnl_unlock();
5685 }
5686
5687 return ret;
5688}
5689
d35a00b8
FJ		 5690static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5691 void __user *buffer, size_t *lenp,
5692 loff_t *ppos)
5693{
5694 int ret = 0;
5695 int new_val;
5696 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5697 struct net *net = (struct net *)ctl->extra2;
5698
8c171d6c
FJ		 5699 if (!rtnl_trylock())
5700 return restart_syscall();
5701
d35a00b8
FJ		 5702 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5703
5704 if (write) {
5705 new_val = *((int *)ctl->data);
5706
8c171d6c
FJ		 5707 if (check_addr_gen_mode(new_val) < 0) {
5708 ret = -EINVAL;
5709 goto out;
5710 }
d35a00b8
FJ		 5711
5712 /* request for default */
5713 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5714 ipv6_devconf_dflt.addr_gen_mode = new_val;
5715
5716 /* request for individual net device */
5717 } else {
5718 if (!idev)
8c171d6c 5719 goto out;
d35a00b8 5720
8c171d6c
FJ		 5721 if (check_stable_privacy(idev, net, new_val) < 0) {
5722 ret = -EINVAL;
5723 goto out;
5724 }
d35a00b8
FJ		 5725
5726 if (idev->cnf.addr_gen_mode != new_val) {
5727 idev->cnf.addr_gen_mode = new_val;
d35a00b8 5728 addrconf_dev_config(idev->dev);
d35a00b8
FJ		 5729 }
5730 }
5731 }
5732
8c171d6c
FJ		 5733out:
5734 rtnl_unlock();
5735
d35a00b8
FJ		 5736 return ret;
5737}
5738
3d1bec99
HFS		 5739static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5740 void __user *buffer, size_t *lenp,
5741 loff_t *ppos)
5742{
5743 int err;
5744 struct in6_addr addr;
5745 char str[IPV6_MAX_STRLEN];
5746 struct ctl_table lctl = *ctl;
622c81d5 5747 struct net *net = ctl->extra2;
3d1bec99
HFS		 5748 struct ipv6_stable_secret *secret = ctl->data;
5749
622c81d5
HFS		 5750 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5751 return -EIO;
5752
3d1bec99
HFS		 5753 lctl.maxlen = IPV6_MAX_STRLEN;
5754 lctl.data = str;
5755
5756 if (!rtnl_trylock())
5757 return restart_syscall();
5758
5759 if (!write && !secret->initialized) {
5760 err = -EIO;
5761 goto out;
5762 }
5763
5449a5ca
WC		 5764 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5765 if (err >= sizeof(str)) {
5766 err = -EIO;
5767 goto out;
3d1bec99
HFS		 5768 }
5769
5770 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5771 if (err || !write)
5772 goto out;
5773
5774 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5775 err = -EIO;
5776 goto out;
5777 }
5778
5779 secret->initialized = true;
5780 secret->secret = addr;
5781
622c81d5
HFS		 5782 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5783 struct net_device *dev;
5784
5785 for_each_netdev(net, dev) {
5786 struct inet6_dev *idev = __in6_dev_get(dev);
5787
5788 if (idev) {
d35a00b8 5789 idev->cnf.addr_gen_mode =
622c81d5
HFS		 5790 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5791 }
5792 }
5793 } else {
5794 struct inet6_dev *idev = ctl->extra1;
5795
d35a00b8 5796 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
622c81d5
HFS		 5797 }
5798
3d1bec99
HFS		 5799out:
5800 rtnl_unlock();
5801
5802 return err;
5803}
c92d5491 5804
35103d11
AG		 5805static
5806int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5807 int write,
5808 void __user *buffer,
5809 size_t *lenp,
5810 loff_t *ppos)
5811{
5812 int *valp = ctl->data;
5813 int val = *valp;
5814 loff_t pos = *ppos;
5815 struct ctl_table lctl;
5816 int ret;
5817
5818 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5819 * we should not modify it until we get the rtnl lock.
5820 */
5821 lctl = *ctl;
5822 lctl.data = &val;
5823
5824 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5825
5826 if (write)
5827 ret = addrconf_fixup_linkdown(ctl, valp, val);
5828 if (ret)
5829 *ppos = pos;
5830 return ret;
5831}
5832
cb4a4c69 5833static int minus_one = -1;
cb9e684e
MŻ		 5834static const int one = 1;
5835static const int two_five_five = 255;
5836
607ea7cd 5837static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 5838 {
5839 .procname = "forwarding",
5840 .data = &ipv6_devconf.forwarding,
5841 .maxlen = sizeof(int),
5842 .mode = 0644,
5843 .proc_handler = addrconf_sysctl_forward,
5844 },
5845 {
5846 .procname = "hop_limit",
5847 .data = &ipv6_devconf.hop_limit,
5848 .maxlen = sizeof(int),
5849 .mode = 0644,
cb9e684e
MŻ		 5850 .proc_handler = proc_dointvec_minmax,
5851 .extra1 = (void *)&one,
5852 .extra2 = (void *)&two_five_five,
5df1f77f
KK		 5853 },
5854 {
5855 .procname = "mtu",
5856 .data = &ipv6_devconf.mtu6,
5857 .maxlen = sizeof(int),
5858 .mode = 0644,
5859 .proc_handler = addrconf_sysctl_mtu,
5860 },
5861 {
5862 .procname = "accept_ra",
5863 .data = &ipv6_devconf.accept_ra,
5864 .maxlen = sizeof(int),
5865 .mode = 0644,
5866 .proc_handler = proc_dointvec,
5867 },
5868 {
5869 .procname = "accept_redirects",
5870 .data = &ipv6_devconf.accept_redirects,
5871 .maxlen = sizeof(int),
5872 .mode = 0644,
5873 .proc_handler = proc_dointvec,
5874 },
5875 {
5876 .procname = "autoconf",
5877 .data = &ipv6_devconf.autoconf,
5878 .maxlen = sizeof(int),
5879 .mode = 0644,
5880 .proc_handler = proc_dointvec,
5881 },
5882 {
5883 .procname = "dad_transmits",
5884 .data = &ipv6_devconf.dad_transmits,
5885 .maxlen = sizeof(int),
5886 .mode = 0644,
5887 .proc_handler = proc_dointvec,
5888 },
5889 {
5890 .procname = "router_solicitations",
5891 .data = &ipv6_devconf.rtr_solicits,
5892 .maxlen = sizeof(int),
5893 .mode = 0644,
cb4a4c69
MŻ		 5894 .proc_handler = proc_dointvec_minmax,
5895 .extra1 = &minus_one,
5df1f77f
KK		 5896 },
5897 {
5898 .procname = "router_solicitation_interval",
5899 .data = &ipv6_devconf.rtr_solicit_interval,
5900 .maxlen = sizeof(int),
5901 .mode = 0644,
5902 .proc_handler = proc_dointvec_jiffies,
5903 },
bd11f074
MŻ		 5904 {
5905 .procname = "router_solicitation_max_interval",
5906 .data = &ipv6_devconf.rtr_solicit_max_interval,
5907 .maxlen = sizeof(int),
5908 .mode = 0644,
5909 .proc_handler = proc_dointvec_jiffies,
5910 },
5df1f77f
KK		 5911 {
5912 .procname = "router_solicitation_delay",
5913 .data = &ipv6_devconf.rtr_solicit_delay,
5914 .maxlen = sizeof(int),
5915 .mode = 0644,
5916 .proc_handler = proc_dointvec_jiffies,
5917 },
5918 {
5919 .procname = "force_mld_version",
5920 .data = &ipv6_devconf.force_mld_version,
5921 .maxlen = sizeof(int),
5922 .mode = 0644,
5923 .proc_handler = proc_dointvec,
5924 },
5925 {
5926 .procname = "mldv1_unsolicited_report_interval",
5927 .data =
5928 &ipv6_devconf.mldv1_unsolicited_report_interval,
5929 .maxlen = sizeof(int),
5930 .mode = 0644,
5931 .proc_handler = proc_dointvec_ms_jiffies,
5932 },
5933 {
5934 .procname = "mldv2_unsolicited_report_interval",
5935 .data =
5936 &ipv6_devconf.mldv2_unsolicited_report_interval,
5937 .maxlen = sizeof(int),
5938 .mode = 0644,
5939 .proc_handler = proc_dointvec_ms_jiffies,
5940 },
5941 {
5942 .procname = "use_tempaddr",
5943 .data = &ipv6_devconf.use_tempaddr,
5944 .maxlen = sizeof(int),
5945 .mode = 0644,
5946 .proc_handler = proc_dointvec,
5947 },
5948 {
5949 .procname = "temp_valid_lft",
5950 .data = &ipv6_devconf.temp_valid_lft,
5951 .maxlen = sizeof(int),
5952 .mode = 0644,
5953 .proc_handler = proc_dointvec,
5954 },
5955 {
5956 .procname = "temp_prefered_lft",
5957 .data = &ipv6_devconf.temp_prefered_lft,
5958 .maxlen = sizeof(int),
5959 .mode = 0644,
5960 .proc_handler = proc_dointvec,
5961 },
5962 {
5963 .procname = "regen_max_retry",
5964 .data = &ipv6_devconf.regen_max_retry,
5965 .maxlen = sizeof(int),
5966 .mode = 0644,
5967 .proc_handler = proc_dointvec,
5968 },
5969 {
5970 .procname = "max_desync_factor",
5971 .data = &ipv6_devconf.max_desync_factor,
5972 .maxlen = sizeof(int),
5973 .mode = 0644,
5974 .proc_handler = proc_dointvec,
5975 },
5976 {
5977 .procname = "max_addresses",
5978 .data = &ipv6_devconf.max_addresses,
5979 .maxlen = sizeof(int),
5980 .mode = 0644,
5981 .proc_handler = proc_dointvec,
5982 },
5983 {
5984 .procname = "accept_ra_defrtr",
5985 .data = &ipv6_devconf.accept_ra_defrtr,
5986 .maxlen = sizeof(int),
5987 .mode = 0644,
5988 .proc_handler = proc_dointvec,
5989 },
5990 {
5991 .procname = "accept_ra_min_hop_limit",
5992 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5993 .maxlen = sizeof(int),
5994 .mode = 0644,
5995 .proc_handler = proc_dointvec,
5996 },
5997 {
5998 .procname = "accept_ra_pinfo",
5999 .data = &ipv6_devconf.accept_ra_pinfo,
6000 .maxlen = sizeof(int),
6001 .mode = 0644,
6002 .proc_handler = proc_dointvec,
6003 },
930d6ff2 6004#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 6005 {
6006 .procname = "accept_ra_rtr_pref",
6007 .data = &ipv6_devconf.accept_ra_rtr_pref,
6008 .maxlen = sizeof(int),
6009 .mode = 0644,
6010 .proc_handler = proc_dointvec,
6011 },
6012 {
6013 .procname = "router_probe_interval",
6014 .data = &ipv6_devconf.rtr_probe_interval,
6015 .maxlen = sizeof(int),
6016 .mode = 0644,
6017 .proc_handler = proc_dointvec_jiffies,
6018 },
fa03ef38 6019#ifdef CONFIG_IPV6_ROUTE_INFO
5df1f77f
KK		 6020 {
6021 .procname = "accept_ra_rt_info_max_plen",
6022 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6023 .maxlen = sizeof(int),
6024 .mode = 0644,
6025 .proc_handler = proc_dointvec,
6026 },
09c884d4 6027#endif
930d6ff2 6028#endif
5df1f77f
KK		 6029 {
6030 .procname = "proxy_ndp",
6031 .data = &ipv6_devconf.proxy_ndp,
6032 .maxlen = sizeof(int),
6033 .mode = 0644,
6034 .proc_handler = addrconf_sysctl_proxy_ndp,
6035 },
6036 {
6037 .procname = "accept_source_route",
6038 .data = &ipv6_devconf.accept_source_route,
6039 .maxlen = sizeof(int),
6040 .mode = 0644,
6041 .proc_handler = proc_dointvec,
6042 },
95c385b4 6043#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 6044 {
6045 .procname = "optimistic_dad",
6046 .data = &ipv6_devconf.optimistic_dad,
6047 .maxlen = sizeof(int),
6048 .mode = 0644,
6049 .proc_handler = proc_dointvec,
6050 },
6051 {
6052 .procname = "use_optimistic",
6053 .data = &ipv6_devconf.use_optimistic,
6054 .maxlen = sizeof(int),
6055 .mode = 0644,
6056 .proc_handler = proc_dointvec,
6057 },
7bc570c8
YH		 6058#endif
6059#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 6060 {
6061 .procname = "mc_forwarding",
6062 .data = &ipv6_devconf.mc_forwarding,
6063 .maxlen = sizeof(int),
6064 .mode = 0444,
6065 .proc_handler = proc_dointvec,
6066 },
95c385b4 6067#endif
5df1f77f
KK		 6068 {
6069 .procname = "disable_ipv6",
6070 .data = &ipv6_devconf.disable_ipv6,
6071 .maxlen = sizeof(int),
6072 .mode = 0644,
6073 .proc_handler = addrconf_sysctl_disable,
6074 },
6075 {
6076 .procname = "accept_dad",
6077 .data = &ipv6_devconf.accept_dad,
6078 .maxlen = sizeof(int),
6079 .mode = 0644,
6080 .proc_handler = proc_dointvec,
6081 },
6082 {
6083 .procname = "force_tllao",
6084 .data = &ipv6_devconf.force_tllao,
6085 .maxlen = sizeof(int),
6086 .mode = 0644,
6087 .proc_handler = proc_dointvec
6088 },
6089 {
6090 .procname = "ndisc_notify",
6091 .data = &ipv6_devconf.ndisc_notify,
6092 .maxlen = sizeof(int),
6093 .mode = 0644,
6094 .proc_handler = proc_dointvec
6095 },
6096 {
6097 .procname = "suppress_frag_ndisc",
6098 .data = &ipv6_devconf.suppress_frag_ndisc,
6099 .maxlen = sizeof(int),
6100 .mode = 0644,
6101 .proc_handler = proc_dointvec
6102 },
6103 {
6104 .procname = "accept_ra_from_local",
6105 .data = &ipv6_devconf.accept_ra_from_local,
6106 .maxlen = sizeof(int),
6107 .mode = 0644,
6108 .proc_handler = proc_dointvec,
6109 },
6110 {
6111 .procname = "accept_ra_mtu",
6112 .data = &ipv6_devconf.accept_ra_mtu,
6113 .maxlen = sizeof(int),
6114 .mode = 0644,
6115 .proc_handler = proc_dointvec,
6116 },
6117 {
6118 .procname = "stable_secret",
6119 .data = &ipv6_devconf.stable_secret,
6120 .maxlen = IPV6_MAX_STRLEN,
6121 .mode = 0600,
6122 .proc_handler = addrconf_sysctl_stable_secret,
6123 },
6124 {
6125 .procname = "use_oif_addrs_only",
6126 .data = &ipv6_devconf.use_oif_addrs_only,
6127 .maxlen = sizeof(int),
6128 .mode = 0644,
6129 .proc_handler = proc_dointvec,
6130 },
6131 {
6132 .procname = "ignore_routes_with_linkdown",
6133 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6134 .maxlen = sizeof(int),
6135 .mode = 0644,
6136 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6137 },
6138 {
6139 .procname = "drop_unicast_in_l2_multicast",
6140 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6141 .maxlen = sizeof(int),
6142 .mode = 0644,
6143 .proc_handler = proc_dointvec,
6144 },
6145 {
6146 .procname = "drop_unsolicited_na",
6147 .data = &ipv6_devconf.drop_unsolicited_na,
6148 .maxlen = sizeof(int),
6149 .mode = 0644,
6150 .proc_handler = proc_dointvec,
6151 },
6152 {
6153 .procname = "keep_addr_on_down",
6154 .data = &ipv6_devconf.keep_addr_on_down,
6155 .maxlen = sizeof(int),
6156 .mode = 0644,
6157 .proc_handler = proc_dointvec,
6158
6159 },
1ababeba
DL		 6160 {
6161 .procname = "seg6_enabled",
6162 .data = &ipv6_devconf.seg6_enabled,
6163 .maxlen = sizeof(int),
6164 .mode = 0644,
6165 .proc_handler = proc_dointvec,
6166 },
bf355b8d
DL		 6167#ifdef CONFIG_IPV6_SEG6_HMAC
6168 {
6169 .procname = "seg6_require_hmac",
6170 .data = &ipv6_devconf.seg6_require_hmac,
6171 .maxlen = sizeof(int),
6172 .mode = 0644,
6173 .proc_handler = proc_dointvec,
6174 },
6175#endif
adc176c5
EN		 6176 {
6177 .procname = "enhanced_dad",
6178 .data = &ipv6_devconf.enhanced_dad,
6179 .maxlen = sizeof(int),
6180 .mode = 0644,
6181 .proc_handler = proc_dointvec,
6182 },
d35a00b8
FJ		 6183 {
6184 .procname = "addr_gen_mode",
6185 .data = &ipv6_devconf.addr_gen_mode,
6186 .maxlen = sizeof(int),
6187 .mode = 0644,
6188 .proc_handler = addrconf_sysctl_addr_gen_mode,
6189 },
5df1f77f
KK		 6190 {
6191 /* sentinel */
6192 }
1da177e4
LT		 6193};
6194
bff16c2f 6195static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 6196 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4 6197{
29c994e3 6198 int i, ifindex;
607ea7cd 6199 struct ctl_table *table;
6105e293 6200 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 6201
607ea7cd
KK		 6202 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6203 if (!table)
f68635e6
PE		 6204 goto out;
6205
607ea7cd
KK		 6206 for (i = 0; table[i].data; i++) {
6207 table[i].data += (char *)p - (char *)&ipv6_devconf;
cb9e684e
MŻ		 6208 /* If one of these is already set, then it is not safe to
6209 * overwrite either of them: this makes proc_dointvec_minmax
6210 * usable.
6211 */
6212 if (!table[i].extra1 && !table[i].extra2) {
6213 table[i].extra1 = idev; /* embedded; no ref */
6214 table[i].extra2 = net;
6215 }
1da177e4 6216 }
1da177e4 6217
6105e293 6218 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 6219
607ea7cd
KK		 6220 p->sysctl_header = register_net_sysctl(net, path, table);
6221 if (!p->sysctl_header)
6105e293 6222 goto free;
f68635e6 6223
29c994e3
ND		 6224 if (!strcmp(dev_name, "all"))
6225 ifindex = NETCONFA_IFINDEX_ALL;
6226 else if (!strcmp(dev_name, "default"))
6227 ifindex = NETCONFA_IFINDEX_DEFAULT;
6228 else
6229 ifindex = idev->dev->ifindex;
6230 inet6_netconf_notify_devconf(net, NETCONFA_ALL, ifindex, p);
95897312 6231 return 0;
1da177e4 6232
f68635e6 6233free:
607ea7cd 6234 kfree(table);
f68635e6 6235out:
95897312 6236 return -ENOBUFS;
1da177e4
LT		 6237}
6238
408c4768
PE		 6239static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
6240{
607ea7cd 6241 struct ctl_table *table;
408c4768 6242
607ea7cd 6243 if (!p->sysctl_header)
408c4768
PE		 6244 return;
6245
607ea7cd
KK		 6246 table = p->sysctl_header->ctl_table_arg;
6247 unregister_net_sysctl_table(p->sysctl_header);
6248 p->sysctl_header = NULL;
6249 kfree(table);
408c4768
PE		 6250}
6251
a317a2f1 6252static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 6253{
a317a2f1
WC		 6254 int err;
6255
6256 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6257 return -EINVAL;
6258
6259 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6260 &ndisc_ifinfo_sysctl_change);
6261 if (err)
6262 return err;
6263 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6264 idev, &idev->cnf);
6265 if (err)
6266 neigh_sysctl_unregister(idev->nd_parms);
6267
6268 return err;
f52295a9
PE		 6269}
6270
408c4768 6271static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 6272{
408c4768
PE		 6273 __addrconf_sysctl_unregister(&idev->cnf);
6274 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 6275}
6276
6277
6278#endif
6279
2c8c1e72 6280static int __net_init addrconf_init_net(struct net *net)
e0da5a48 6281{
a79ca223 6282 int err = -ENOMEM;
e0da5a48
PE		 6283 struct ipv6_devconf *all, *dflt;
6284
a79ca223 6285 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 6286 if (!all)
a79ca223 6287 goto err_alloc_all;
e0da5a48 6288
a79ca223 6289 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 6290 if (!dflt)
a79ca223 6291 goto err_alloc_dflt;
e0da5a48 6292
a79ca223
HZ		 6293 /* these will be inherited by all namespaces */
6294 dflt->autoconf = ipv6_defaults.autoconf;
6295 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 6296
3d1bec99
HFS		 6297 dflt->stable_secret.initialized = false;
6298 all->stable_secret.initialized = false;
6299
e0da5a48
PE		 6300 net->ipv6.devconf_all = all;
6301 net->ipv6.devconf_dflt = dflt;
6302
6303#ifdef CONFIG_SYSCTL
f8572d8f 6304 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 6305 if (err < 0)
6306 goto err_reg_all;
6307
f8572d8f 6308 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 6309 if (err < 0)
6310 goto err_reg_dflt;
6311#endif
6312 return 0;
6313
6314#ifdef CONFIG_SYSCTL
6315err_reg_dflt:
6316 __addrconf_sysctl_unregister(all);
6317err_reg_all:
6318 kfree(dflt);
6319#endif
6320err_alloc_dflt:
6321 kfree(all);
6322err_alloc_all:
6323 return err;
6324}
6325
2c8c1e72 6326static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 6327{
6328#ifdef CONFIG_SYSCTL
6329 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
6330 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
6331#endif
73cf0e92 6332 kfree(net->ipv6.devconf_dflt);
6333 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 6334}
6335
6336static struct pernet_operations addrconf_ops = {
6337 .init = addrconf_init_net,
6338 .exit = addrconf_exit_net,
6339};
6340
207895fd 6341static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 6342 .family = AF_INET6,
6343 .fill_link_af = inet6_fill_link_af,
6344 .get_link_af_size = inet6_get_link_af_size,
11b1f828 6345 .validate_link_af = inet6_validate_link_af,
f53adae4 6346 .set_link_af = inet6_set_link_af,
b382b191
TG		 6347};
6348
1da177e4
LT		 6349/*
6350 * Init / cleanup code
6351 */
6352
6353int __init addrconf_init(void)
6354{
a317a2f1 6355 struct inet6_dev *idev;
c2e21293 6356 int i, err;
2a8cc6c8 6357
e21e8467
SH		 6358 err = ipv6_addr_label_init();
6359 if (err < 0) {
f3213831
JP		 6360 pr_crit("%s: cannot initialize default policy table: %d\n",
6361 __func__, err);
2cc6d2bf 6362 goto out;
2a8cc6c8 6363 }
1da177e4 6364
2cc6d2bf
NH		 6365 err = register_pernet_subsys(&addrconf_ops);
6366 if (err < 0)
6367 goto out_addrlabel;
e0da5a48 6368
c15b1cca
HFS		 6369 addrconf_wq = create_workqueue("ipv6_addrconf");
6370 if (!addrconf_wq) {
6371 err = -ENOMEM;
6372 goto out_nowq;
6373 }
6374
1da177e4
LT		 6375 /* The addrconf netdev notifier requires that loopback_dev
6376 * has it's ipv6 private information allocated and setup
6377 * before it can bring up and give link-local addresses
6378 * to other devices which are up.
6379 *
6380 * Unfortunately, loopback_dev is not necessarily the first
6381 * entry in the global dev_base list of net devices. In fact,
6382 * it is likely to be the very last entry on that list.
6383 * So this causes the notifier registry below to try and
6384 * give link-local addresses to all devices besides loopback_dev
6385 * first, then loopback_dev, which cases all the non-loopback_dev
6386 * devices to fail to get a link-local address.
6387 *
6388 * So, as a temporary fix, allocate the ipv6 structure for
6389 * loopback_dev first by hand.
6390 * Longer term, all of the dependencies ipv6 has upon the loopback
6391 * device and it being up should be removed.
6392 */
6393 rtnl_lock();
a317a2f1 6394 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 6395 rtnl_unlock();
a317a2f1
WC		 6396 if (IS_ERR(idev)) {
6397 err = PTR_ERR(idev);
e0da5a48 6398 goto errlo;
a317a2f1 6399 }
1da177e4 6400
c2e21293 6401 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6402 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6403
1da177e4
LT		 6404 register_netdevice_notifier(&ipv6_dev_notf);
6405
c15b1cca 6406 addrconf_verify();
c127ea2c 6407
3678a9d8 6408 rtnl_af_register(&inet6_ops);
b382b191 6409
c7ac8679
GR		 6410 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6411 NULL);
c127ea2c
TG		 6412 if (err < 0)
6413 goto errout;
6414
6415 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 6416 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6417 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6418 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6419 inet6_dump_ifaddr, NULL);
6420 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6421 inet6_dump_ifmcaddr, NULL);
6422 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6423 inet6_dump_ifacaddr, NULL);
76f8f6cb 6424 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 6425 inet6_netconf_dump_devconf, NULL);
c127ea2c 6426
2a8cc6c8
YH		 6427 ipv6_addr_label_rtnl_register();
6428
1da177e4 6429 return 0;
c127ea2c 6430errout:
b382b191 6431 rtnl_af_unregister(&inet6_ops);
c127ea2c 6432 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6433errlo:
c15b1cca
HFS		 6434 destroy_workqueue(addrconf_wq);
6435out_nowq:
e0da5a48 6436 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 6437out_addrlabel:
6438 ipv6_addr_label_cleanup();
6439out:
c127ea2c 6440 return err;
1da177e4
LT		 6441}
6442
09f7709f 6443void addrconf_cleanup(void)
1da177e4 6444{
176c39af 6445 struct net_device *dev;
1da177e4
LT		 6446 int i;
6447
6448 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6449 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 6450 ipv6_addr_label_cleanup();
1da177e4
LT		 6451
6452 rtnl_lock();
6453
b382b191
TG		 6454 __rtnl_af_unregister(&inet6_ops);
6455
176c39af
DL		 6456 /* clean dev list */
6457 for_each_netdev(&init_net, dev) {
6458 if (__in6_dev_get(dev) == NULL)
6459 continue;
6460 addrconf_ifdown(dev, 1);
6461 }
6462 addrconf_ifdown(init_net.loopback_dev, 2);
6463
1da177e4
LT		 6464 /*
6465 * Check hash table.
6466 */
5c578aed 6467 spin_lock_bh(&addrconf_hash_lock);
c2e21293 6468 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6469 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 6470 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 6471 cancel_delayed_work(&addr_chk_work);
1da177e4 6472 rtnl_unlock();
c15b1cca
HFS		 6473
6474 destroy_workqueue(addrconf_wq);
1da177e4 6475}
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