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net: ipv6: regenerate host route if moved to gc list
[mirror_ubuntu-focal-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{
8048ced9
DA		 3274 /* rt6i_ref == 0 means the host route was removed from the
3275 * FIB, for example, if 'lo' device is taken down. In that
3276 * case regenerate the host route.
3277 */
3278 if (!ifp->rt || !atomic_read(&ifp->rt->rt6i_ref)) {
3279 struct rt6_info *rt, *prev;
f1705ec1
DA		 3280
3281 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3282 if (unlikely(IS_ERR(rt)))
3283 return PTR_ERR(rt);
3284
8048ced9
DA		 3285 /* ifp->rt can be accessed outside of rtnl */
3286 spin_lock(&ifp->lock);
3287 prev = ifp->rt;
f1705ec1 3288 ifp->rt = rt;
8048ced9
DA		 3289 spin_unlock(&ifp->lock);
3290
3291 ip6_rt_put(prev);
f1705ec1
DA		 3292 }
3293
3294 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3295 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3296 idev->dev, 0, 0);
3297 }
3298
3299 addrconf_dad_start(ifp);
3300
3301 return 0;
3302}
3303
3304static void addrconf_permanent_addr(struct net_device *dev)
3305{
3306 struct inet6_ifaddr *ifp, *tmp;
3307 struct inet6_dev *idev;
3308
3309 idev = __in6_dev_get(dev);
3310 if (!idev)
3311 return;
3312
3313 write_lock_bh(&idev->lock);
3314
3315 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3316 if ((ifp->flags & IFA_F_PERMANENT) &&
3317 fixup_permanent_addr(idev, ifp) < 0) {
3318 write_unlock_bh(&idev->lock);
3319 ipv6_del_addr(ifp);
3320 write_lock_bh(&idev->lock);
3321
3322 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3323 idev->dev->name, &ifp->addr);
3324 }
3325 }
3326
3327 write_unlock_bh(&idev->lock);
3328}
3329
1ab1457c 3330static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3331 void *ptr)
1da177e4 3332{
351638e7 3333 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4f7f34ea 3334 struct netdev_notifier_changeupper_info *info;
748e2d93 3335 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 3336 int run_pending = 0;
b217d616 3337 int err;
1da177e4 3338
e21e8467 3339 switch (event) {
45ba9dd2 3340 case NETDEV_REGISTER:
74235a25 3341 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3342 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3343 if (IS_ERR(idev))
3344 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3345 }
3346 break;
bcdd553f 3347
b7b0b1d2
AD		 3348 case NETDEV_CHANGEMTU:
3349 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3350 if (dev->mtu < IPV6_MIN_MTU) {
3351 addrconf_ifdown(dev, 1);
3352 break;
3353 }
3354
3355 if (idev) {
3356 rt6_mtu_change(dev, dev->mtu);
3357 idev->cnf.mtu6 = dev->mtu;
3358 break;
3359 }
3360
3361 /* allocate new idev */
3362 idev = ipv6_add_dev(dev);
3363 if (IS_ERR(idev))
3364 break;
3365
3366 /* device is still not ready */
3367 if (!(idev->if_flags & IF_READY))
3368 break;
3369
3370 run_pending = 1;
3371
3372 /* fall through */
3373
1da177e4 3374 case NETDEV_UP:
3c21edbd 3375 case NETDEV_CHANGE:
c2edacf8
JV		 3376 if (dev->flags & IFF_SLAVE)
3377 break;
3378
3ce62a84
WC		 3379 if (idev && idev->cnf.disable_ipv6)
3380 break;
3381
3c21edbd 3382 if (event == NETDEV_UP) {
38bd10c4
DA		 3383 /* restore routes for permanent addresses */
3384 addrconf_permanent_addr(dev);
3385
f24e3d65 3386 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 3387 /* device is not ready yet. */
f3213831 3388 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3389 dev->name);
3390 break;
3391 }
99081049 3392
d31c7b8f
EP		 3393 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3394 idev = ipv6_add_dev(dev);
3395
a317a2f1 3396 if (!IS_ERR_OR_NULL(idev)) {
99081049 3397 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3398 run_pending = 1;
3399 }
b7b0b1d2 3400 } else if (event == NETDEV_CHANGE) {
f24e3d65 3401 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 3402 /* device is still not ready. */
3403 break;
3404 }
3405
3406 if (idev) {
a088d1d7
LL		 3407 if (idev->if_flags & IF_READY) {
3408 /* device is already configured -
3409 * but resend MLD reports, we might
3410 * have roamed and need to update
3411 * multicast snooping switches
3412 */
3413 ipv6_mc_up(idev);
3c21edbd 3414 break;
a088d1d7 3415 }
3c21edbd
YH		 3416 idev->if_flags |= IF_READY;
3417 }
3418
f3213831
JP		 3419 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3420 dev->name);
3c21edbd 3421
c5e33bdd 3422 run_pending = 1;
3c21edbd
YH		 3423 }
3424
e21e8467 3425 switch (dev->type) {
07a93626 3426#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3427 case ARPHRD_SIT:
3428 addrconf_sit_config(dev);
3429 break;
aee80b54 3430#endif
07a93626 3431#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3432 case ARPHRD_IPGRE:
3433 addrconf_gre_config(dev);
3434 break;
0be669bb 3435#endif
1da177e4
LT		 3436 case ARPHRD_LOOPBACK:
3437 init_loopback(dev);
3438 break;
3439
3440 default:
3441 addrconf_dev_config(dev);
3442 break;
3ff50b79 3443 }
bcdd553f 3444
a317a2f1 3445 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3446 if (run_pending)
3447 addrconf_dad_run(idev);
3448
bcdd553f
SH		 3449 /*
3450 * If the MTU changed during the interface down,
3451 * when the interface up, the changed MTU must be
3452 * reflected in the idev as well as routers.
1da177e4 3453 */
bcdd553f
SH		 3454 if (idev->cnf.mtu6 != dev->mtu &&
3455 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3456 rt6_mtu_change(dev, dev->mtu);
3457 idev->cnf.mtu6 = dev->mtu;
3458 }
3459 idev->tstamp = jiffies;
3460 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3461
3462 /*
3463 * If the changed mtu during down is lower than
3464 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3465 */
3466 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 3467 addrconf_ifdown(dev, 1);
1da177e4
LT		 3468 }
3469 break;
3470
1da177e4
LT		 3471 case NETDEV_DOWN:
3472 case NETDEV_UNREGISTER:
3473 /*
3474 * Remove all addresses from this interface.
3475 */
3476 addrconf_ifdown(dev, event != NETDEV_DOWN);
3477 break;
3c21edbd 3478
1da177e4 3479 case NETDEV_CHANGENAME:
1da177e4 3480 if (idev) {
5632c515 3481 snmp6_unregister_dev(idev);
408c4768 3482 addrconf_sysctl_unregister(idev);
a317a2f1 3483 err = addrconf_sysctl_register(idev);
b217d616
HX		 3484 if (err)
3485 return notifier_from_errno(err);
a317a2f1
WC		 3486 err = snmp6_register_dev(idev);
3487 if (err) {
3488 addrconf_sysctl_unregister(idev);
3489 return notifier_from_errno(err);
3490 }
5632c515 3491 }
1da177e4 3492 break;
bcdd553f 3493
93d9b7d7
JP		 3494 case NETDEV_PRE_TYPE_CHANGE:
3495 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3496 if (idev)
3497 addrconf_type_change(dev, event);
75c78500 3498 break;
4f7f34ea
DA		 3499
3500 case NETDEV_CHANGEUPPER:
3501 info = ptr;
3502
3503 /* flush all routes if dev is linked to or unlinked from
3504 * an L3 master device (e.g., VRF)
3505 */
3506 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3507 addrconf_ifdown(dev, 0);
3ff50b79 3508 }
1da177e4
LT		 3509
3510 return NOTIFY_OK;
3511}
3512
3513/*
3514 * addrconf module should be notified of a device going up
3515 */
3516static struct notifier_block ipv6_dev_notf = {
3517 .notifier_call = addrconf_notify,
1da177e4
LT		 3518};
3519
93d9b7d7 3520static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3521{
3522 struct inet6_dev *idev;
3523 ASSERT_RTNL();
3524
3525 idev = __in6_dev_get(dev);
3526
93d9b7d7 3527 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3528 ipv6_mc_remap(idev);
93d9b7d7 3529 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3530 ipv6_mc_unmap(idev);
3531}
3532
70af921d
DA		 3533static bool addr_is_local(const struct in6_addr *addr)
3534{
3535 return ipv6_addr_type(addr) &
3536 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3537}
3538
1da177e4
LT		 3539static int addrconf_ifdown(struct net_device *dev, int how)
3540{
c346dca1 3541 struct net *net = dev_net(dev);
502a2ffd 3542 struct inet6_dev *idev;
f1705ec1
DA		 3543 struct inet6_ifaddr *ifa, *tmp;
3544 struct list_head del_list;
3545 int _keep_addr;
3546 bool keep_addr;
73a8bd74 3547 int state, i;
1da177e4
LT		 3548
3549 ASSERT_RTNL();
3550
73a8bd74
DM		 3551 rt6_ifdown(net, dev);
3552 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3553
3554 idev = __in6_dev_get(dev);
63159f29 3555 if (!idev)
1da177e4
LT		 3556 return -ENODEV;
3557
bcdd553f
SH		 3558 /*
3559 * Step 1: remove reference to ipv6 device from parent device.
3560 * Do not dev_put!
1da177e4 3561 */
439e2385 3562 if (how) {
1da177e4 3563 idev->dead = 1;
8814c4b5
YH		 3564
3565 /* protected by rtnl_lock */
a9b3cd7f 3566 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3567
3568 /* Step 1.5: remove snmp6 entry */
3569 snmp6_unregister_dev(idev);
3570
3571 }
3572
f1705ec1
DA		 3573 /* aggregate the system setting and interface setting */
3574 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3575 if (!_keep_addr)
3576 _keep_addr = idev->cnf.keep_addr_on_down;
3577
3578 /* combine the user config with event to determine if permanent
3579 * addresses are to be removed from address hash table
3580 */
bc561632 3581 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
f1705ec1 3582
73a8bd74
DM		 3583 /* Step 2: clear hash table */
3584 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3585 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3586
3587 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3588restart:
b67bfe0d 3589 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3590 if (ifa->idev == idev) {
c15b1cca 3591 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3592 /* combined flag + permanent flag decide if
3593 * address is retained on a down event
3594 */
3595 if (!keep_addr ||
70af921d
DA		 3596 !(ifa->flags & IFA_F_PERMANENT) ||
3597 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3598 hlist_del_init_rcu(&ifa->addr_lst);
3599 goto restart;
3600 }
73a8bd74
DM		 3601 }
3602 }
3603 spin_unlock_bh(&addrconf_hash_lock);
3604 }
3605
1da177e4
LT		 3606 write_lock_bh(&idev->lock);
3607
b7b1bfce
HFS		 3608 addrconf_del_rs_timer(idev);
3609
bcdd553f 3610 /* Step 2: clear flags for stateless addrconf */
439e2385 3611 if (!how)
3c21edbd 3612 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3613
bcdd553f 3614 /* Step 3: clear tempaddr list */
372e6c8f 3615 while (!list_empty(&idev->tempaddr_list)) {
3616 ifa = list_first_entry(&idev->tempaddr_list,
3617 struct inet6_ifaddr, tmp_list);
3618 list_del(&ifa->tmp_list);
1da177e4
LT		 3619 write_unlock_bh(&idev->lock);
3620 spin_lock_bh(&ifa->lock);
3621
3622 if (ifa->ifpub) {
3623 in6_ifa_put(ifa->ifpub);
3624 ifa->ifpub = NULL;
3625 }
3626 spin_unlock_bh(&ifa->lock);
3627 in6_ifa_put(ifa);
3628 write_lock_bh(&idev->lock);
3629 }
8f37ada5 3630
f1705ec1
DA		 3631 /* re-combine the user config with event to determine if permanent
3632 * addresses are to be removed from the interface list
3633 */
bc561632 3634 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
84e8b803 3635
f1705ec1
DA		 3636 INIT_LIST_HEAD(&del_list);
3637 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
38bd10c4 3638 struct rt6_info *rt = NULL;
a2d6cbb0 3639 bool keep;
38bd10c4 3640
f1705ec1 3641 addrconf_del_dad_work(ifa);
84e8b803 3642
a2d6cbb0
RV		 3643 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3644 !addr_is_local(&ifa->addr);
3645 if (!keep)
3646 list_move(&ifa->if_list, &del_list);
3647
73a8bd74 3648 write_unlock_bh(&idev->lock);
8e8e676d 3649 spin_lock_bh(&ifa->lock);
f1705ec1 3650
a2d6cbb0 3651 if (keep) {
f1705ec1
DA		 3652 /* set state to skip the notifier below */
3653 state = INET6_IFADDR_STATE_DEAD;
3654 ifa->state = 0;
3655 if (!(ifa->flags & IFA_F_NODAD))
3656 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3657
3658 rt = ifa->rt;
3659 ifa->rt = NULL;
f1705ec1
DA		 3660 } else {
3661 state = ifa->state;
3662 ifa->state = INET6_IFADDR_STATE_DEAD;
f1705ec1
DA		 3663 }
3664
8e8e676d 3665 spin_unlock_bh(&ifa->lock);
9d82ca98 3666
38bd10c4
DA		 3667 if (rt)
3668 ip6_del_rt(rt);
3669
73a8bd74
DM		 3670 if (state != INET6_IFADDR_STATE_DEAD) {
3671 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3672 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
ea06f717
MM		 3673 } else {
3674 if (idev->cnf.forwarding)
3675 addrconf_leave_anycast(ifa);
3676 addrconf_leave_solict(ifa->idev, &ifa->addr);
27bdb2ab 3677 }
8f37ada5 3678
73a8bd74
DM		 3679 write_lock_bh(&idev->lock);
3680 }
8f37ada5 3681
1da177e4
LT		 3682 write_unlock_bh(&idev->lock);
3683
f1705ec1
DA		 3684 /* now clean up addresses to be removed */
3685 while (!list_empty(&del_list)) {
3686 ifa = list_first_entry(&del_list,
3687 struct inet6_ifaddr, if_list);
3688 list_del(&ifa->if_list);
3689
3690 in6_ifa_put(ifa);
3691 }
3692
381f4dca
SD		 3693 /* Step 5: Discard anycast and multicast list */
3694 if (how) {
3695 ipv6_ac_destroy_dev(idev);
1da177e4 3696 ipv6_mc_destroy_dev(idev);
381f4dca 3697 } else {
1da177e4 3698 ipv6_mc_down(idev);
381f4dca 3699 }
1da177e4 3700
1da177e4 3701 idev->tstamp = jiffies;
1ab1457c 3702
bcdd553f 3703 /* Last: Shot the device (if unregistered) */
439e2385 3704 if (how) {
408c4768 3705 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3706 neigh_parms_release(&nd_tbl, idev->nd_parms);
3707 neigh_ifdown(&nd_tbl, dev);
3708 in6_dev_put(idev);
3709 }
3710 return 0;
3711}
3712
3713static void addrconf_rs_timer(unsigned long data)
3714{
b7b1bfce 3715 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3716 struct net_device *dev = idev->dev;
b7b1bfce 3717 struct in6_addr lladdr;
1da177e4 3718
b7b1bfce 3719 write_lock(&idev->lock);
5b2a1953 3720 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3721 goto out;
3722
9ba2add3 3723 if (!ipv6_accept_ra(idev))
5b2a1953 3724 goto out;
3725
3726 /* Announcement received after solicitation was sent */
3727 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3728 goto out;
1da177e4 3729
bd11f074 3730 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
caf92bc4
CW		 3731 write_unlock(&idev->lock);
3732 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3733 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3734 &in6addr_linklocal_allrouters);
3735 else
caf92bc4 3736 goto put;
1da177e4 3737
caf92bc4 3738 write_lock(&idev->lock);
bd11f074
MŻ		 3739 idev->rs_interval = rfc3315_s14_backoff_update(
3740 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
b7b1bfce
HFS		 3741 /* The wait after the last probe can be shorter */
3742 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3743 idev->cnf.rtr_solicits) ?
3744 idev->cnf.rtr_solicit_delay :
bd11f074 3745 idev->rs_interval);
1da177e4 3746 } else {
1da177e4
LT		 3747 /*
3748 * Note: we do not support deprecated "all on-link"
3749 * assumption any longer.
3750 */
91df42be 3751 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3752 }
3753
3754out:
b7b1bfce 3755 write_unlock(&idev->lock);
caf92bc4 3756put:
b7b1bfce 3757 in6_dev_put(idev);
1da177e4
LT		 3758}
3759
3760/*
3761 * Duplicate Address Detection
3762 */
3c21edbd
YH		 3763static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3764{
3765 unsigned long rand_num;
3766 struct inet6_dev *idev = ifp->idev;
adc176c5 3767 u64 nonce;
3c21edbd 3768
95c385b4
NH		 3769 if (ifp->flags & IFA_F_OPTIMISTIC)
3770 rand_num = 0;
3771 else
63862b5b 3772 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3773
adc176c5
EN		 3774 nonce = 0;
3775 if (idev->cnf.enhanced_dad ||
3776 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3777 do
3778 get_random_bytes(&nonce, 6);
3779 while (nonce == 0);
3780 }
3781 ifp->dad_nonce = nonce;
b7b1bfce 3782 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3783 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3784}
3785
c15b1cca 3786static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3787{
3788 struct inet6_dev *idev = ifp->idev;
3789 struct net_device *dev = idev->dev;
764d3be6 3790 bool bump_id, notify = false;
1da177e4
LT		 3791
3792 addrconf_join_solict(dev, &ifp->addr);
3793
63862b5b 3794 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3795
3796 read_lock_bh(&idev->lock);
622ccdf1 3797 spin_lock(&ifp->lock);
e9d3e084 3798 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3799 goto out;
1da177e4
LT		 3800
3801 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3802 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3803 !(ifp->flags&IFA_F_TENTATIVE) ||
3804 ifp->flags & IFA_F_NODAD) {
764d3be6 3805 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3806 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3807 spin_unlock(&ifp->lock);
1da177e4
LT		 3808 read_unlock_bh(&idev->lock);
3809
764d3be6 3810 addrconf_dad_completed(ifp, bump_id);
1da177e4
LT		 3811 return;
3812 }
3813
6732bade 3814 if (!(idev->if_flags & IF_READY)) {
21809faf 3815 spin_unlock(&ifp->lock);
6732bade 3816 read_unlock_bh(&idev->lock);
3c21edbd 3817 /*
590a9887 3818 * If the device is not ready:
3c21edbd
YH		 3819 * - keep it tentative if it is a permanent address.
3820 * - otherwise, kill it.
3821 */
3822 in6_ifa_hold(ifp);
cc411d0b 3823 addrconf_dad_stop(ifp, 0);
6732bade 3824 return;
3c21edbd 3825 }
95c385b4
NH		 3826
3827 /*
3828 * Optimistic nodes can start receiving
3829 * Frames right away
3830 */
7fd2561e 3831 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3832 ip6_ins_rt(ifp->rt);
7fd2561e
EK		 3833 if (ipv6_use_optimistic_addr(idev)) {
3834 /* Because optimistic nodes can use this address,
3835 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3836 */
16186a82 3837 notify = true;
7fd2561e
EK		 3838 }
3839 }
95c385b4 3840
6732bade 3841 addrconf_dad_kick(ifp);
1da177e4 3842out:
622ccdf1 3843 spin_unlock(&ifp->lock);
1da177e4 3844 read_unlock_bh(&idev->lock);
16186a82
SAK		 3845 if (notify)
3846 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 3847}
3848
c15b1cca 3849static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3850{
c15b1cca
HFS		 3851 bool begin_dad = false;
3852
8e8e676d 3853 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3854 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3855 ifp->state = INET6_IFADDR_STATE_PREDAD;
3856 begin_dad = true;
3857 }
8e8e676d 3858 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3859
3860 if (begin_dad)
3861 addrconf_mod_dad_work(ifp, 0);
3862}
3863
3864static void addrconf_dad_work(struct work_struct *w)
3865{
3866 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3867 struct inet6_ifaddr,
3868 dad_work);
1da177e4 3869 struct inet6_dev *idev = ifp->idev;
764d3be6 3870 bool bump_id, disable_ipv6 = false;
1da177e4
LT		 3871 struct in6_addr mcaddr;
3872
c15b1cca
HFS		 3873 enum {
3874 DAD_PROCESS,
3875 DAD_BEGIN,
3876 DAD_ABORT,
3877 } action = DAD_PROCESS;
3878
3879 rtnl_lock();
3880
8e8e676d 3881 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3882 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3883 action = DAD_BEGIN;
3884 ifp->state = INET6_IFADDR_STATE_DAD;
3885 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3886 action = DAD_ABORT;
3887 ifp->state = INET6_IFADDR_STATE_POSTDAD;
85b51b12
MM		 3888
3889 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3890 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3891 struct in6_addr addr;
3892
3893 addr.s6_addr32[0] = htonl(0xfe800000);
3894 addr.s6_addr32[1] = 0;
3895
3896 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3897 ipv6_addr_equal(&ifp->addr, &addr)) {
3898 /* DAD failed for link-local based on MAC */
3899 idev->cnf.disable_ipv6 = 1;
3900
3901 pr_info("%s: IPv6 being disabled!\n",
3902 ifp->idev->dev->name);
3903 disable_ipv6 = true;
3904 }
3905 }
c15b1cca 3906 }
8e8e676d 3907 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3908
3909 if (action == DAD_BEGIN) {
3910 addrconf_dad_begin(ifp);
3911 goto out;
3912 } else if (action == DAD_ABORT) {
751eb6b6 3913 in6_ifa_hold(ifp);
c15b1cca 3914 addrconf_dad_stop(ifp, 1);
85b51b12
MM		 3915 if (disable_ipv6)
3916 addrconf_ifdown(idev->dev, 0);
c15b1cca
HFS		 3917 goto out;
3918 }
3919
b7b1bfce 3920 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3921 goto out;
3922
c15b1cca 3923 write_lock_bh(&idev->lock);
122e4519 3924 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3925 write_unlock_bh(&idev->lock);
1da177e4
LT		 3926 goto out;
3927 }
21809faf 3928
3929 spin_lock(&ifp->lock);
622ccdf1
HX		 3930 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3931 spin_unlock(&ifp->lock);
c15b1cca 3932 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3933 goto out;
3934 }
3935
b7b1bfce 3936 if (ifp->dad_probes == 0) {
1da177e4
LT		 3937 /*
3938 * DAD was successful
3939 */
3940
764d3be6 3941 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3942 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3943 spin_unlock(&ifp->lock);
c15b1cca 3944 write_unlock_bh(&idev->lock);
1da177e4 3945
764d3be6 3946 addrconf_dad_completed(ifp, bump_id);
1da177e4
LT		 3947
3948 goto out;
3949 }
3950
b7b1bfce 3951 ifp->dad_probes--;
c15b1cca
HFS		 3952 addrconf_mod_dad_work(ifp,
3953 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3954 spin_unlock(&ifp->lock);
c15b1cca 3955 write_unlock_bh(&idev->lock);
1da177e4
LT		 3956
3957 /* send a neighbour solicitation for our addr */
1da177e4 3958 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
adc176c5
EN		 3959 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
3960 ifp->dad_nonce);
1da177e4
LT		 3961out:
3962 in6_ifa_put(ifp);
c15b1cca 3963 rtnl_unlock();
1da177e4
LT		 3964}
3965
11ffff75
HFS		 3966/* ifp->idev must be at least read locked */
3967static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3968{
3969 struct inet6_ifaddr *ifpiter;
3970 struct inet6_dev *idev = ifp->idev;
3971
602582ca
HFS		 3972 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3973 if (ifpiter->scope > IFA_LINK)
3974 break;
11ffff75
HFS		 3975 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3976 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3977 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3978 IFA_F_PERMANENT)
3979 return false;
3980 }
3981 return true;
3982}
3983
764d3be6 3984static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id)
1da177e4 3985{
e21e8467 3986 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3987 struct in6_addr lladdr;
b173ee48 3988 bool send_rs, send_mld;
b7b1bfce 3989
c15b1cca 3990 addrconf_del_dad_work(ifp);
1da177e4
LT		 3991
3992 /*
3993 * Configure the address for reception. Now it is valid.
3994 */
3995
3996 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3997
026359bc
TA		 3998 /* If added prefix is link local and we are prepared to process
3999 router advertisements, start sending router solicitations.
1da177e4
LT		 4000 */
4001
1ec047eb 4002 read_lock_bh(&ifp->idev->lock);
11ffff75 4003 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 4004 send_rs = send_mld &&
4005 ipv6_accept_ra(ifp->idev) &&
bd11f074 4006 ifp->idev->cnf.rtr_solicits != 0 &&
b173ee48 4007 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 4008 read_unlock_bh(&ifp->idev->lock);
4009
b173ee48
HFS		 4010 /* While dad is in progress mld report's source address is in6_addrany.
4011 * Resend with proper ll now.
4012 */
4013 if (send_mld)
4014 ipv6_mc_dad_complete(ifp->idev);
4015
1ec047eb 4016 if (send_rs) {
1da177e4
LT		 4017 /*
4018 * If a host as already performed a random delay
4019 * [...] as part of DAD [...] there is no need
4020 * to delay again before sending the first RS
4021 */
1ec047eb 4022 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 4023 return;
1ec047eb 4024 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 4025
b7b1bfce
HFS		 4026 write_lock_bh(&ifp->idev->lock);
4027 spin_lock(&ifp->lock);
bd11f074
MŻ		 4028 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4029 ifp->idev->cnf.rtr_solicit_interval);
b7b1bfce 4030 ifp->idev->rs_probes = 1;
1da177e4 4031 ifp->idev->if_flags |= IF_RS_SENT;
bd11f074 4032 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
b7b1bfce
HFS		 4033 spin_unlock(&ifp->lock);
4034 write_unlock_bh(&ifp->idev->lock);
1da177e4 4035 }
764d3be6
PA		 4036
4037 if (bump_id)
4038 rt_genid_bump_ipv6(dev_net(dev));
a11a7f71
MH		 4039
4040 /* Make sure that a new temporary address will be created
4041 * before this temporary address becomes deprecated.
4042 */
4043 if (ifp->flags & IFA_F_TEMPORARY)
4044 addrconf_verify_rtnl();
1da177e4
LT		 4045}
4046
e21e8467
SH		 4047static void addrconf_dad_run(struct inet6_dev *idev)
4048{
c5e33bdd
YH		 4049 struct inet6_ifaddr *ifp;
4050
4051 read_lock_bh(&idev->lock);
502a2ffd 4052 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 4053 spin_lock(&ifp->lock);
f2344a13
HX		 4054 if (ifp->flags & IFA_F_TENTATIVE &&
4055 ifp->state == INET6_IFADDR_STATE_DAD)
4056 addrconf_dad_kick(ifp);
21809faf 4057 spin_unlock(&ifp->lock);
c5e33bdd
YH		 4058 }
4059 read_unlock_bh(&idev->lock);
4060}
4061
1da177e4
LT		 4062#ifdef CONFIG_PROC_FS
4063struct if6_iter_state {
3c40090a 4064 struct seq_net_private p;
1da177e4 4065 int bucket;
1d578303 4066 int offset;
1da177e4
LT		 4067};
4068
1d578303 4069static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 4070{
4071 struct inet6_ifaddr *ifa = NULL;
4072 struct if6_iter_state *state = seq->private;
1218854a 4073 struct net *net = seq_file_net(seq);
1d578303 4074 int p = 0;
1da177e4 4075
1d578303
MM		 4076 /* initial bucket if pos is 0 */
4077 if (pos == 0) {
4078 state->bucket = 0;
4079 state->offset = 0;
4080 }
4081
4082 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 4083 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 4084 addr_lst) {
9f0d3c27
ED		 4085 if (!net_eq(dev_net(ifa->idev->dev), net))
4086 continue;
1d578303
MM		 4087 /* sync with offset */
4088 if (p < state->offset) {
4089 p++;
4090 continue;
4091 }
4092 state->offset++;
9f0d3c27 4093 return ifa;
1d578303
MM		 4094 }
4095
4096 /* prepare for next bucket */
4097 state->offset = 0;
4098 p = 0;
1da177e4 4099 }
c2e21293 4100 return NULL;
1da177e4
LT		 4101}
4102
c2e21293 4103static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4104 struct inet6_ifaddr *ifa)
1da177e4
LT		 4105{
4106 struct if6_iter_state *state = seq->private;
1218854a 4107 struct net *net = seq_file_net(seq);
1da177e4 4108
b67bfe0d 4109 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 4110 if (!net_eq(dev_net(ifa->idev->dev), net))
4111 continue;
1d578303 4112 state->offset++;
9f0d3c27 4113 return ifa;
1d578303 4114 }
3c40090a 4115
c2e21293 4116 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 4117 state->offset = 0;
b67bfe0d 4118 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 4119 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 4120 if (!net_eq(dev_net(ifa->idev->dev), net))
4121 continue;
1d578303 4122 state->offset++;
9f0d3c27 4123 return ifa;
c2e21293 4124 }
1da177e4 4125 }
3c40090a 4126
c2e21293 4127 return NULL;
1da177e4
LT		 4128}
4129
1da177e4 4130static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 4131 __acquires(rcu_bh)
1da177e4 4132{
5c578aed 4133 rcu_read_lock_bh();
1d578303 4134 return if6_get_first(seq, *pos);
1da177e4
LT		 4135}
4136
4137static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4138{
4139 struct inet6_ifaddr *ifa;
4140
4141 ifa = if6_get_next(seq, v);
4142 ++*pos;
4143 return ifa;
4144}
4145
4146static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 4147 __releases(rcu_bh)
1da177e4 4148{
5c578aed 4149 rcu_read_unlock_bh();
1da177e4
LT		 4150}
4151
4152static int if6_seq_show(struct seq_file *seq, void *v)
4153{
4154 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4155 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4156 &ifp->addr,
1da177e4
LT		 4157 ifp->idev->dev->ifindex,
4158 ifp->prefix_len,
4159 ifp->scope,
971a351c 4160 (u8) ifp->flags,
1da177e4
LT		 4161 ifp->idev->dev->name);
4162 return 0;
4163}
4164
56b3d975 4165static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4166 .start = if6_seq_start,
4167 .next = if6_seq_next,
4168 .show = if6_seq_show,
4169 .stop = if6_seq_stop,
4170};
4171
4172static int if6_seq_open(struct inode *inode, struct file *file)
4173{
3c40090a
DL		 4174 return seq_open_net(inode, file, &if6_seq_ops,
4175 sizeof(struct if6_iter_state));
1da177e4
LT		 4176}
4177
9a32144e 4178static const struct file_operations if6_fops = {
1da177e4
LT		 4179 .owner = THIS_MODULE,
4180 .open = if6_seq_open,
4181 .read = seq_read,
4182 .llseek = seq_lseek,
3c40090a 4183 .release = seq_release_net,
1da177e4
LT		 4184};
4185
2c8c1e72 4186static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4187{
d4beaa66 4188 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 4189 return -ENOMEM;
4190 return 0;
4191}
4192
2c8c1e72 4193static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4194{
ece31ffd 4195 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4196}
4197
4198static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4199 .init = if6_proc_net_init,
4200 .exit = if6_proc_net_exit,
3c40090a
DL		 4201};
4202
4203int __init if6_proc_init(void)
4204{
4205 return register_pernet_subsys(&if6_proc_net_ops);
4206}
4207
1da177e4
LT		 4208void if6_proc_exit(void)
4209{
3c40090a 4210 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4211}
4212#endif /* CONFIG_PROC_FS */
4213
07a93626 4214#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4215/* Check if address is a home address configured on any interface. */
b71d1d42 4216int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 4217{
4218 int ret = 0;
c2e21293 4219 struct inet6_ifaddr *ifp = NULL;
ddbe5032 4220 unsigned int hash = inet6_addr_hash(addr);
c2e21293 4221
5c578aed 4222 rcu_read_lock_bh();
b67bfe0d 4223 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 4224 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 4225 continue;
caad295f 4226 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4227 (ifp->flags & IFA_F_HOMEADDRESS)) {
4228 ret = 1;
4229 break;
4230 }
4231 }
5c578aed 4232 rcu_read_unlock_bh();
3b9f9a1c
NT		 4233 return ret;
4234}
4235#endif
4236
1da177e4
LT		 4237/*
4238 * Periodic address status verification
4239 */
4240
c15b1cca 4241static void addrconf_verify_rtnl(void)
1da177e4 4242{
b2db7564 4243 unsigned long now, next, next_sec, next_sched;
1da177e4 4244 struct inet6_ifaddr *ifp;
1da177e4
LT		 4245 int i;
4246
c15b1cca
HFS		 4247 ASSERT_RTNL();
4248
5c578aed 4249 rcu_read_lock_bh();
1da177e4 4250 now = jiffies;
b2db7564 4251 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4252
c15b1cca 4253 cancel_delayed_work(&addr_chk_work);
1da177e4 4254
bcdd553f 4255 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4256restart:
c15b1cca 4257 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 4258 unsigned long age;
1da177e4 4259
fad8da3e
YA		 4260 /* When setting preferred_lft to a value not zero or
4261 * infinity, while valid_lft is infinity
4262 * IFA_F_PERMANENT has a non-infinity life time.
4263 */
4264 if ((ifp->flags & IFA_F_PERMANENT) &&
4265 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4266 continue;
4267
4268 spin_lock(&ifp->lock);
b2db7564
YH		 4269 /* We try to batch several events at once. */
4270 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4271
8f27ebb9
YH		 4272 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4273 age >= ifp->valid_lft) {
1da177e4
LT		 4274 spin_unlock(&ifp->lock);
4275 in6_ifa_hold(ifp);
1da177e4
LT		 4276 ipv6_del_addr(ifp);
4277 goto restart;
8f27ebb9
YH		 4278 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4279 spin_unlock(&ifp->lock);
4280 continue;
1da177e4 4281 } else if (age >= ifp->prefered_lft) {
a1ed0526 4282 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4283 int deprecate = 0;
4284
4285 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4286 deprecate = 1;
4287 ifp->flags |= IFA_F_DEPRECATED;
4288 }
4289
fad8da3e
YA		 4290 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4291 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4292 next = ifp->tstamp + ifp->valid_lft * HZ;
4293
4294 spin_unlock(&ifp->lock);
4295
4296 if (deprecate) {
4297 in6_ifa_hold(ifp);
1da177e4
LT		 4298
4299 ipv6_ifa_notify(0, ifp);
4300 in6_ifa_put(ifp);
4301 goto restart;
4302 }
1da177e4
LT		 4303 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4304 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4305 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4306 ifp->idev->cnf.dad_transmits *
1f9248e5 4307 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 4308
1da177e4
LT		 4309 if (age >= ifp->prefered_lft - regen_advance) {
4310 struct inet6_ifaddr *ifpub = ifp->ifpub;
4311 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4312 next = ifp->tstamp + ifp->prefered_lft * HZ;
4313 if (!ifp->regen_count && ifpub) {
4314 ifp->regen_count++;
4315 in6_ifa_hold(ifp);
4316 in6_ifa_hold(ifpub);
4317 spin_unlock(&ifp->lock);
5c578aed 4318
291d809b
HY		 4319 spin_lock(&ifpub->lock);
4320 ifpub->regen_count = 0;
4321 spin_unlock(&ifpub->lock);
1da177e4
LT		 4322 ipv6_create_tempaddr(ifpub, ifp);
4323 in6_ifa_put(ifpub);
4324 in6_ifa_put(ifp);
4325 goto restart;
4326 }
4327 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4328 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4329 spin_unlock(&ifp->lock);
1da177e4
LT		 4330 } else {
4331 /* ifp->prefered_lft <= ifp->valid_lft */
4332 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4333 next = ifp->tstamp + ifp->prefered_lft * HZ;
4334 spin_unlock(&ifp->lock);
4335 }
4336 }
1da177e4
LT		 4337 }
4338
b2db7564
YH		 4339 next_sec = round_jiffies_up(next);
4340 next_sched = next;
4341
4342 /* If rounded timeout is accurate enough, accept it. */
4343 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4344 next_sched = next_sec;
4345
4346 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4347 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4348 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4349
ba3542e1 4350 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4351 now, next, next_sec, next_sched);
c15b1cca 4352 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4353 rcu_read_unlock_bh();
1da177e4
LT		 4354}
4355
c15b1cca
HFS		 4356static void addrconf_verify_work(struct work_struct *w)
4357{
4358 rtnl_lock();
4359 addrconf_verify_rtnl();
4360 rtnl_unlock();
4361}
4362
4363static void addrconf_verify(void)
4364{
4365 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4366}
4367
caeaba79
ND		 4368static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4369 struct in6_addr **peer_pfx)
461d8837
TG		 4370{
4371 struct in6_addr *pfx = NULL;
4372
caeaba79
ND		 4373 *peer_pfx = NULL;
4374
461d8837
TG		 4375 if (addr)
4376 pfx = nla_data(addr);
4377
4378 if (local) {
4379 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4380 *peer_pfx = pfx;
4381 pfx = nla_data(local);
461d8837
TG		 4382 }
4383
4384 return pfx;
4385}
4386
ef7c79ed 4387static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4388 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4389 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4390 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4391 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 4392};
4393
1da177e4 4394static int
661d2967 4395inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4396{
3b1e0a65 4397 struct net *net = sock_net(skb->sk);
b933f716
TG		 4398 struct ifaddrmsg *ifm;
4399 struct nlattr *tb[IFA_MAX+1];
caeaba79 4400 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4401 u32 ifa_flags;
b933f716 4402 int err;
1da177e4 4403
b933f716
TG		 4404 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4405 if (err < 0)
4406 return err;
4407
4408 ifm = nlmsg_data(nlh);
caeaba79 4409 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4410 if (!pfx)
1da177e4
LT		 4411 return -EINVAL;
4412
6046d5b4
HK		 4413 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4414
4415 /* We ignore other flags so far. */
4416 ifa_flags &= IFA_F_MANAGETEMPADDR;
4417
4418 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4419 ifm->ifa_prefixlen);
1da177e4
LT		 4420}
4421
479840ff 4422static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 4423 u32 prefered_lft, u32 valid_lft)
081bba5b 4424{
6f704992
YH		 4425 u32 flags;
4426 clock_t expires;
4bed72e4 4427 unsigned long timeout;
53bd6749 4428 bool was_managetempaddr;
5b84efec 4429 bool had_prefixroute;
46d48046 4430
c15b1cca
HFS		 4431 ASSERT_RTNL();
4432
081bba5b
NT		 4433 if (!valid_lft || (prefered_lft > valid_lft))
4434 return -EINVAL;
4435
53bd6749
JP		 4436 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4437 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4438 return -EINVAL;
4439
4bed72e4
YH		 4440 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4441 if (addrconf_finite_timeout(timeout)) {
4442 expires = jiffies_to_clock_t(timeout * HZ);
4443 valid_lft = timeout;
6f704992 4444 flags = RTF_EXPIRES;
4bed72e4
YH		 4445 } else {
4446 expires = 0;
4447 flags = 0;
4448 ifa_flags |= IFA_F_PERMANENT;
6f704992 4449 }
081bba5b 4450
4bed72e4
YH		 4451 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4452 if (addrconf_finite_timeout(timeout)) {
4453 if (timeout == 0)
4454 ifa_flags |= IFA_F_DEPRECATED;
4455 prefered_lft = timeout;
4456 }
081bba5b
NT		 4457
4458 spin_lock_bh(&ifp->lock);
53bd6749 4459 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4460 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4461 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4462 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4463 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4464 IFA_F_NOPREFIXROUTE);
53bd6749 4465 ifp->flags |= ifa_flags;
081bba5b
NT		 4466 ifp->tstamp = jiffies;
4467 ifp->valid_lft = valid_lft;
4468 ifp->prefered_lft = prefered_lft;
4469
4470 spin_unlock_bh(&ifp->lock);
4471 if (!(ifp->flags&IFA_F_TENTATIVE))
4472 ipv6_ifa_notify(0, ifp);
081bba5b 4473
761aac73
TH		 4474 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4475 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4476 expires, flags);
5b84efec
TH		 4477 } else if (had_prefixroute) {
4478 enum cleanup_prefix_rt_t action;
4479 unsigned long rt_expires;
4480
4481 write_lock_bh(&ifp->idev->lock);
4482 action = check_cleanup_prefix_route(ifp, &rt_expires);
4483 write_unlock_bh(&ifp->idev->lock);
4484
4485 if (action != CLEANUP_PREFIX_RT_NOP) {
4486 cleanup_prefix_route(ifp, rt_expires,
4487 action == CLEANUP_PREFIX_RT_DEL);
4488 }
761aac73 4489 }
53bd6749
JP		 4490
4491 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4492 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4493 valid_lft = prefered_lft = 0;
4494 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4495 !was_managetempaddr, jiffies);
4496 }
4497
c15b1cca 4498 addrconf_verify_rtnl();
081bba5b
NT		 4499
4500 return 0;
4501}
4502
1da177e4 4503static int
661d2967 4504inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4505{
3b1e0a65 4506 struct net *net = sock_net(skb->sk);
461d8837
TG		 4507 struct ifaddrmsg *ifm;
4508 struct nlattr *tb[IFA_MAX+1];
caeaba79 4509 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 4510 struct inet6_ifaddr *ifa;
4511 struct net_device *dev;
55ebaef1 4512 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 4513 u32 ifa_flags;
461d8837 4514 int err;
1da177e4 4515
461d8837
TG		 4516 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4517 if (err < 0)
4518 return err;
4519
4520 ifm = nlmsg_data(nlh);
caeaba79 4521 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4522 if (!pfx)
1da177e4
LT		 4523 return -EINVAL;
4524
461d8837 4525 if (tb[IFA_CACHEINFO]) {
0778769d 4526 struct ifa_cacheinfo *ci;
461d8837
TG		 4527
4528 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 4529 valid_lft = ci->ifa_valid;
461d8837
TG		 4530 preferred_lft = ci->ifa_prefered;
4531 } else {
4532 preferred_lft = INFINITY_LIFE_TIME;
4533 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 4534 }
4535
af284937 4536 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4537 if (!dev)
7198f8ce
TG		 4538 return -ENODEV;
4539
479840ff
JP		 4540 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4541
55ebaef1 4542 /* We ignore other flags so far. */
761aac73 4543 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
93a714d6 4544 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
55ebaef1 4545
1cab3da6 4546 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
63159f29 4547 if (!ifa) {
7198f8ce
TG		 4548 /*
4549 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4550 * userspace already relies on not having to provide this.
7198f8ce 4551 */
caeaba79 4552 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 4553 ifm->ifa_prefixlen, ifa_flags,
4554 preferred_lft, valid_lft);
081bba5b
NT		 4555 }
4556
7198f8ce
TG		 4557 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4558 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4559 err = -EEXIST;
4560 else
55ebaef1 4561 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 4562
4563 in6_ifa_put(ifa);
4564
4565 return err;
1da177e4
LT		 4566}
4567
479840ff 4568static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4569 u8 scope, int ifindex)
4570{
4571 struct ifaddrmsg *ifm;
4572
4573 ifm = nlmsg_data(nlh);
4574 ifm->ifa_family = AF_INET6;
4575 ifm->ifa_prefixlen = prefixlen;
4576 ifm->ifa_flags = flags;
4577 ifm->ifa_scope = scope;
4578 ifm->ifa_index = ifindex;
4579}
4580
85486af0
TG		 4581static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4582 unsigned long tstamp, u32 preferred, u32 valid)
4583{
4584 struct ifa_cacheinfo ci;
4585
18a31e1e
TG		 4586 ci.cstamp = cstamp_delta(cstamp);
4587 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4588 ci.ifa_prefered = preferred;
4589 ci.ifa_valid = valid;
4590
4591 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4592}
4593
101bb229
TG		 4594static inline int rt_scope(int ifa_scope)
4595{
4596 if (ifa_scope & IFA_HOST)
4597 return RT_SCOPE_HOST;
4598 else if (ifa_scope & IFA_LINK)
4599 return RT_SCOPE_LINK;
4600 else if (ifa_scope & IFA_SITE)
4601 return RT_SCOPE_SITE;
4602 else
4603 return RT_SCOPE_UNIVERSE;
4604}
4605
0ab6803b
TG		 4606static inline int inet6_ifaddr_msgsize(void)
4607{
339bf98f 4608 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4609 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4610 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4611 + nla_total_size(sizeof(struct ifa_cacheinfo))
4612 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4613}
c5396a31 4614
1da177e4 4615static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4616 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4617{
1da177e4 4618 struct nlmsghdr *nlh;
85486af0 4619 u32 preferred, valid;
1da177e4 4620
15e47304 4621 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4622 if (!nlh)
26932566 4623 return -EMSGSIZE;
0ab6803b 4624
101bb229
TG		 4625 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4626 ifa->idev->dev->ifindex);
4627
fad8da3e
YA		 4628 if (!((ifa->flags&IFA_F_PERMANENT) &&
4629 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4630 preferred = ifa->prefered_lft;
4631 valid = ifa->valid_lft;
4632 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4633 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4634 if (preferred > tval)
4635 preferred -= tval;
4636 else
4637 preferred = 0;
f56619fc
BH		 4638 if (valid != INFINITY_LIFE_TIME) {
4639 if (valid > tval)
4640 valid -= tval;
4641 else
4642 valid = 0;
4643 }
1da177e4
LT		 4644 }
4645 } else {
85486af0
TG		 4646 preferred = INFINITY_LIFE_TIME;
4647 valid = INFINITY_LIFE_TIME;
4648 }
4649
7996c799 4650 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4651 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4652 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4653 goto error;
4654 } else
930345ea 4655 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4656 goto error;
4657
4658 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4659 goto error;
1da177e4 4660
479840ff
JP		 4661 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4662 goto error;
4663
053c095a
JB		 4664 nlmsg_end(skb, nlh);
4665 return 0;
caeaba79
ND		 4666
4667error:
4668 nlmsg_cancel(skb, nlh);
4669 return -EMSGSIZE;
1da177e4
LT		 4670}
4671
4672static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4673 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4674{
1da177e4 4675 struct nlmsghdr *nlh;
101bb229
TG		 4676 u8 scope = RT_SCOPE_UNIVERSE;
4677 int ifindex = ifmca->idev->dev->ifindex;
4678
4679 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4680 scope = RT_SCOPE_SITE;
1da177e4 4681
15e47304 4682 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4683 if (!nlh)
26932566 4684 return -EMSGSIZE;
85486af0 4685
0ab6803b 4686 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4687 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4688 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4689 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4690 nlmsg_cancel(skb, nlh);
4691 return -EMSGSIZE;
4692 }
85486af0 4693
053c095a
JB		 4694 nlmsg_end(skb, nlh);
4695 return 0;
1da177e4
LT		 4696}
4697
4698static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4699 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4700{
1da177e4 4701 struct nlmsghdr *nlh;
101bb229
TG		 4702 u8 scope = RT_SCOPE_UNIVERSE;
4703 int ifindex = ifaca->aca_idev->dev->ifindex;
4704
4705 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4706 scope = RT_SCOPE_SITE;
1da177e4 4707
15e47304 4708 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4709 if (!nlh)
26932566 4710 return -EMSGSIZE;
85486af0 4711
0ab6803b 4712 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4713 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4714 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4715 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4716 nlmsg_cancel(skb, nlh);
4717 return -EMSGSIZE;
4718 }
1da177e4 4719
053c095a
JB		 4720 nlmsg_end(skb, nlh);
4721 return 0;
1da177e4
LT		 4722}
4723
e21e8467 4724enum addr_type_t {
1da177e4
LT		 4725 UNICAST_ADDR,
4726 MULTICAST_ADDR,
4727 ANYCAST_ADDR,
4728};
4729
234b27c3
ED		 4730/* called with rcu_read_lock() */
4731static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4732 struct netlink_callback *cb, enum addr_type_t type,
4733 int s_ip_idx, int *p_ip_idx)
4734{
234b27c3
ED		 4735 struct ifmcaddr6 *ifmca;
4736 struct ifacaddr6 *ifaca;
4737 int err = 1;
4738 int ip_idx = *p_ip_idx;
4739
4740 read_lock_bh(&idev->lock);
4741 switch (type) {
502a2ffd 4742 case UNICAST_ADDR: {
4743 struct inet6_ifaddr *ifa;
4744
234b27c3 4745 /* unicast address incl. temp addr */
502a2ffd 4746 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4747 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4748 continue;
4749 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4750 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4751 cb->nlh->nlmsg_seq,
4752 RTM_NEWADDR,
4753 NLM_F_MULTI);
053c095a 4754 if (err < 0)
234b27c3 4755 break;
63998ac2 4756 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4757 }
4758 break;
502a2ffd 4759 }
234b27c3
ED		 4760 case MULTICAST_ADDR:
4761 /* multicast address */
4762 for (ifmca = idev->mc_list; ifmca;
4763 ifmca = ifmca->next, ip_idx++) {
4764 if (ip_idx < s_ip_idx)
4765 continue;
4766 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4767 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4768 cb->nlh->nlmsg_seq,
4769 RTM_GETMULTICAST,
4770 NLM_F_MULTI);
053c095a 4771 if (err < 0)
234b27c3
ED		 4772 break;
4773 }
4774 break;
4775 case ANYCAST_ADDR:
4776 /* anycast address */
4777 for (ifaca = idev->ac_list; ifaca;
4778 ifaca = ifaca->aca_next, ip_idx++) {
4779 if (ip_idx < s_ip_idx)
4780 continue;
4781 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4782 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4783 cb->nlh->nlmsg_seq,
4784 RTM_GETANYCAST,
4785 NLM_F_MULTI);
053c095a 4786 if (err < 0)
234b27c3
ED		 4787 break;
4788 }
4789 break;
4790 default:
4791 break;
4792 }
4793 read_unlock_bh(&idev->lock);
4794 *p_ip_idx = ip_idx;
4795 return err;
4796}
4797
1da177e4
LT		 4798static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4799 enum addr_type_t type)
4800{
234b27c3
ED		 4801 struct net *net = sock_net(skb->sk);
4802 int h, s_h;
1da177e4
LT		 4803 int idx, ip_idx;
4804 int s_idx, s_ip_idx;
1da177e4 4805 struct net_device *dev;
234b27c3
ED		 4806 struct inet6_dev *idev;
4807 struct hlist_head *head;
1ab1457c 4808
234b27c3
ED		 4809 s_h = cb->args[0];
4810 s_idx = idx = cb->args[1];
4811 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4812
234b27c3 4813 rcu_read_lock();
63998ac2 4814 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4815 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4816 idx = 0;
4817 head = &net->dev_index_head[h];
b67bfe0d 4818 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4819 if (idx < s_idx)
4820 goto cont;
4b97efdf 4821 if (h > s_h || idx > s_idx)
234b27c3
ED		 4822 s_ip_idx = 0;
4823 ip_idx = 0;
e21e8467
SH		 4824 idev = __in6_dev_get(dev);
4825 if (!idev)
234b27c3
ED		 4826 goto cont;
4827
4828 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4829 s_ip_idx, &ip_idx) < 0)
234b27c3 4830 goto done;
7562f876 4831cont:
234b27c3
ED		 4832 idx++;
4833 }
1da177e4 4834 }
234b27c3
ED		 4835done:
4836 rcu_read_unlock();
4837 cb->args[0] = h;
4838 cb->args[1] = idx;
4839 cb->args[2] = ip_idx;
4840
1da177e4
LT		 4841 return skb->len;
4842}
4843
4844static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4845{
4846 enum addr_type_t type = UNICAST_ADDR;
b854272b 4847
1da177e4
LT		 4848 return inet6_dump_addr(skb, cb, type);
4849}
4850
4851static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4852{
4853 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4854
1da177e4
LT		 4855 return inet6_dump_addr(skb, cb, type);
4856}
4857
4858
4859static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4860{
4861 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4862
1da177e4
LT		 4863 return inet6_dump_addr(skb, cb, type);
4864}
4865
661d2967 4866static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4867{
3b1e0a65 4868 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4869 struct ifaddrmsg *ifm;
4870 struct nlattr *tb[IFA_MAX+1];
caeaba79 4871 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4872 struct net_device *dev = NULL;
4873 struct inet6_ifaddr *ifa;
4874 struct sk_buff *skb;
6c223828
NT		 4875 int err;
4876
1b29fc2c
TG		 4877 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4878 if (err < 0)
4879 goto errout;
4880
caeaba79 4881 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
63159f29 4882 if (!addr) {
1b29fc2c
TG		 4883 err = -EINVAL;
4884 goto errout;
6c223828 4885 }
6c223828 4886
1b29fc2c 4887 ifm = nlmsg_data(nlh);
6c223828 4888 if (ifm->ifa_index)
6fda7350 4889 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4890
e21e8467
SH		 4891 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4892 if (!ifa) {
1b29fc2c
TG		 4893 err = -EADDRNOTAVAIL;
4894 goto errout;
4895 }
6c223828 4896
e21e8467
SH		 4897 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4898 if (!skb) {
6c223828 4899 err = -ENOBUFS;
1b29fc2c 4900 goto errout_ifa;
6c223828
NT		 4901 }
4902
15e47304 4903 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4904 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4905 if (err < 0) {
4906 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4907 WARN_ON(err == -EMSGSIZE);
4908 kfree_skb(skb);
4909 goto errout_ifa;
4910 }
15e47304 4911 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4912errout_ifa:
6c223828 4913 in6_ifa_put(ifa);
1b29fc2c 4914errout:
6c223828 4915 return err;
6c223828
NT		 4916}
4917
1da177e4
LT		 4918static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4919{
4920 struct sk_buff *skb;
c346dca1 4921 struct net *net = dev_net(ifa->idev->dev);
5d620266 4922 int err = -ENOBUFS;
1da177e4 4923
f784ad3d
MB		 4924 /* Don't send DELADDR notification for TENTATIVE address,
4925 * since NEWADDR notification is sent only after removing
4926 * TENTATIVE flag.
4927 */
4928 if (ifa->flags & IFA_F_TENTATIVE && event == RTM_DELADDR)
4929 return;
4930
0ab6803b 4931 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 4932 if (!skb)
5d620266
TG		 4933 goto errout;
4934
4935 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4936 if (err < 0) {
4937 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4938 WARN_ON(err == -EMSGSIZE);
4939 kfree_skb(skb);
4940 goto errout;
4941 }
1ce85fe4
PNA		 4942 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4943 return;
5d620266
TG		 4944errout:
4945 if (err < 0)
6fda7350 4946 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4947}
4948
b6f99a21 4949static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4950 __s32 *array, int bytes)
4951{
04561c1f
TG		 4952 BUG_ON(bytes < (DEVCONF_MAX * 4));
4953
1da177e4
LT		 4954 memset(array, 0, bytes);
4955 array[DEVCONF_FORWARDING] = cnf->forwarding;
4956 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4957 array[DEVCONF_MTU6] = cnf->mtu6;
4958 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4959 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4960 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4961 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4962 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4963 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4964 jiffies_to_msecs(cnf->rtr_solicit_interval);
bd11f074
MŻ		 4965 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
4966 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
93908d19
TG		 4967 array[DEVCONF_RTR_SOLICIT_DELAY] =
4968 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4969 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4970 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4971 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4972 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4973 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4974 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4975 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4976 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4977 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4978 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4979 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4980 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 4981 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 4982 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4983#ifdef CONFIG_IPV6_ROUTER_PREF
4984 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4985 array[DEVCONF_RTR_PROBE_INTERVAL] =
4986 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4987#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4988 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4989#endif
930d6ff2 4990#endif
fbea49e1 4991 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4992 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4993#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4994 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 4995 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 4996#endif
7bc570c8
YH		 4997#ifdef CONFIG_IPV6_MROUTE
4998 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4999#endif
778d80be 5000 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 5001 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 5002 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 5003 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 5004 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 5005 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 5006 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 5007 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 5008 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 5009 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 5010 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 5011 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 5012 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1ababeba 5013 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
bf355b8d
DL		 5014#ifdef CONFIG_IPV6_SEG6_HMAC
5015 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5016#endif
adc176c5 5017 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
d35a00b8 5018 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
1da177e4
LT		 5019}
5020
b382b191
TG		 5021static inline size_t inet6_ifla6_size(void)
5022{
5023 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5024 + nla_total_size(sizeof(struct ifla_cacheinfo))
5025 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5026 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 5027 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5028 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 5029}
5030
339bf98f
TG		 5031static inline size_t inet6_if_nlmsg_size(void)
5032{
5033 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5034 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5035 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5036 + nla_total_size(4) /* IFLA_MTU */
5037 + nla_total_size(4) /* IFLA_LINK */
0344338b 5038 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 5039 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 5040}
c5396a31 5041
be281e55 5042static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
aca05671 5043 int bytes)
7f7d9a6b
HX		 5044{
5045 int i;
aca05671 5046 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
7f7d9a6b
HX		 5047 BUG_ON(pad < 0);
5048
5049 /* Use put_unaligned() because stats may not be aligned for u64. */
aca05671
JH		 5050 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5051 for (i = 1; i < ICMP6_MIB_MAX; i++)
be281e55 5052 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b 5053
aca05671 5054 memset(&stats[ICMP6_MIB_MAX], 0, pad);
7f7d9a6b
HX		 5055}
5056
698365fa 5057static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 5058 int bytes, size_t syncpoff)
4ce3c183 5059{
a3a77372
R		 5060 int i, c;
5061 u64 buff[IPSTATS_MIB_MAX];
5062 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5063
4ce3c183
ED		 5064 BUG_ON(pad < 0);
5065
a3a77372
R		 5066 memset(buff, 0, sizeof(buff));
5067 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 5068
a3a77372
R		 5069 for_each_possible_cpu(c) {
5070 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5071 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5072 }
5073
5074 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5075 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 5076}
5077
7f7d9a6b
HX		 5078static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5079 int bytes)
5080{
e21e8467 5081 switch (attrtype) {
7f7d9a6b 5082 case IFLA_INET6_STATS:
a3a77372
R		 5083 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5084 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 5085 break;
5086 case IFLA_INET6_ICMP6STATS:
aca05671 5087 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
7f7d9a6b
HX		 5088 break;
5089 }
5090}
5091
d5566fd7
SV		 5092static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5093 u32 ext_filter_mask)
b382b191
TG		 5094{
5095 struct nlattr *nla;
5096 struct ifla_cacheinfo ci;
5097
c78679e8
DM		 5098 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5099 goto nla_put_failure;
b382b191 5100 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 5101 ci.tstamp = cstamp_delta(idev->tstamp);
5102 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 5103 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 5104 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5105 goto nla_put_failure;
b382b191 5106 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 5107 if (!nla)
b382b191
TG		 5108 goto nla_put_failure;
5109 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5110
5111 /* XXX - MC not implemented */
5112
d5566fd7
SV		 5113 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5114 return 0;
5115
b382b191 5116 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 5117 if (!nla)
b382b191
TG		 5118 goto nla_put_failure;
5119 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5120
5121 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 5122 if (!nla)
b382b191
TG		 5123 goto nla_put_failure;
5124 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5125
f53adae4 5126 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 5127 if (!nla)
f53adae4 5128 goto nla_put_failure;
bc91b0f0 5129
d35a00b8 5130 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
bc91b0f0
JP		 5131 goto nla_put_failure;
5132
f53adae4
DB		 5133 read_lock_bh(&idev->lock);
5134 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5135 read_unlock_bh(&idev->lock);
5136
b382b191
TG		 5137 return 0;
5138
5139nla_put_failure:
5140 return -EMSGSIZE;
5141}
5142
b1974ed0
AR		 5143static size_t inet6_get_link_af_size(const struct net_device *dev,
5144 u32 ext_filter_mask)
b382b191
TG		 5145{
5146 if (!__in6_dev_get(dev))
5147 return 0;
5148
5149 return inet6_ifla6_size();
5150}
5151
d5566fd7
SV		 5152static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5153 u32 ext_filter_mask)
b382b191
TG		 5154{
5155 struct inet6_dev *idev = __in6_dev_get(dev);
5156
5157 if (!idev)
5158 return -ENODATA;
5159
d5566fd7 5160 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5161 return -EMSGSIZE;
5162
5163 return 0;
5164}
5165
f53adae4
DB		 5166static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5167{
f53adae4
DB		 5168 struct inet6_ifaddr *ifp;
5169 struct net_device *dev = idev->dev;
47e27d5e 5170 bool clear_token, update_rs = false;
dc848292 5171 struct in6_addr ll_addr;
f53adae4 5172
c15b1cca
HFS		 5173 ASSERT_RTNL();
5174
63159f29 5175 if (!token)
f53adae4 5176 return -EINVAL;
f53adae4
DB		 5177 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5178 return -EINVAL;
f53adae4
DB		 5179 if (!ipv6_accept_ra(idev))
5180 return -EINVAL;
bd11f074 5181 if (idev->cnf.rtr_solicits == 0)
f53adae4
DB		 5182 return -EINVAL;
5183
5184 write_lock_bh(&idev->lock);
5185
5186 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5187 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5188
5189 write_unlock_bh(&idev->lock);
5190
47e27d5e
DB		 5191 clear_token = ipv6_addr_any(token);
5192 if (clear_token)
5193 goto update_lft;
5194
dc848292
HFS		 5195 if (!idev->dead && (idev->if_flags & IF_READY) &&
5196 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5197 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5198 /* If we're not ready, then normal ifup will take care
5199 * of this. Otherwise, we need to request our rs here.
5200 */
5201 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5202 update_rs = true;
5203 }
f53adae4 5204
47e27d5e 5205update_lft:
f53adae4 5206 write_lock_bh(&idev->lock);
fc403832 5207
77ecaace 5208 if (update_rs) {
fc403832 5209 idev->if_flags |= IF_RS_SENT;
bd11f074
MŻ		 5210 idev->rs_interval = rfc3315_s14_backoff_init(
5211 idev->cnf.rtr_solicit_interval);
77ecaace 5212 idev->rs_probes = 1;
bd11f074 5213 addrconf_mod_rs_timer(idev, idev->rs_interval);
77ecaace 5214 }
f53adae4
DB		 5215
5216 /* Well, that's kinda nasty ... */
5217 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5218 spin_lock(&ifp->lock);
617fe29d 5219 if (ifp->tokenized) {
f53adae4
DB		 5220 ifp->valid_lft = 0;
5221 ifp->prefered_lft = 0;
5222 }
5223 spin_unlock(&ifp->lock);
5224 }
5225
5226 write_unlock_bh(&idev->lock);
b2ed64a9 5227 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 5228 addrconf_verify_rtnl();
f53adae4
DB		 5229 return 0;
5230}
5231
11b1f828
DB		 5232static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5233 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5234 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5235};
5236
5237static int inet6_validate_link_af(const struct net_device *dev,
5238 const struct nlattr *nla)
5239{
5240 struct nlattr *tb[IFLA_INET6_MAX + 1];
5241
5242 if (dev && !__in6_dev_get(dev))
5243 return -EAFNOSUPPORT;
5244
5245 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5246}
5247
d35a00b8
FJ		 5248static int check_addr_gen_mode(int mode)
5249{
5250 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5251 mode != IN6_ADDR_GEN_MODE_NONE &&
5252 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5253 mode != IN6_ADDR_GEN_MODE_RANDOM)
5254 return -EINVAL;
5255 return 1;
5256}
5257
5258static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5259 int mode)
5260{
5261 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5262 !idev->cnf.stable_secret.initialized &&
5263 !net->ipv6.devconf_dflt->stable_secret.initialized)
5264 return -EINVAL;
5265 return 1;
5266}
5267
f53adae4
DB		 5268static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5269{
5270 int err = -EINVAL;
5271 struct inet6_dev *idev = __in6_dev_get(dev);
5272 struct nlattr *tb[IFLA_INET6_MAX + 1];
5273
5274 if (!idev)
5275 return -EAFNOSUPPORT;
5276
5277 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5278 BUG();
5279
bc91b0f0 5280 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 5281 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 5282 if (err)
5283 return err;
5284 }
5285
5286 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5287 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5288
d35a00b8
FJ		 5289 if (check_addr_gen_mode(mode) < 0 ||
5290 check_stable_privacy(idev, dev_net(dev), mode) < 0)
bc91b0f0 5291 return -EINVAL;
622c81d5 5292
d35a00b8 5293 idev->cnf.addr_gen_mode = mode;
bc91b0f0
JP		 5294 err = 0;
5295 }
f53adae4
DB		 5296
5297 return err;
5298}
5299
1ab1457c 5300static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5301 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5302{
04561c1f 5303 struct net_device *dev = idev->dev;
04561c1f
TG		 5304 struct ifinfomsg *hdr;
5305 struct nlmsghdr *nlh;
5306 void *protoinfo;
04561c1f 5307
15e47304 5308 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5309 if (!nlh)
26932566 5310 return -EMSGSIZE;
04561c1f
TG		 5311
5312 hdr = nlmsg_data(nlh);
5313 hdr->ifi_family = AF_INET6;
5314 hdr->__ifi_pad = 0;
5315 hdr->ifi_type = dev->type;
5316 hdr->ifi_index = dev->ifindex;
5317 hdr->ifi_flags = dev_get_flags(dev);
5318 hdr->ifi_change = 0;
5319
c78679e8
DM		 5320 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5321 (dev->addr_len &&
5322 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5323 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5324 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5325 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5326 nla_put_u8(skb, IFLA_OPERSTATE,
5327 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5328 goto nla_put_failure;
04561c1f 5329 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 5330 if (!protoinfo)
04561c1f 5331 goto nla_put_failure;
1da177e4 5332
d5566fd7 5333 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5334 goto nla_put_failure;
1da177e4 5335
04561c1f 5336 nla_nest_end(skb, protoinfo);
053c095a
JB		 5337 nlmsg_end(skb, nlh);
5338 return 0;
1da177e4 5339
04561c1f 5340nla_put_failure:
26932566
PM		 5341 nlmsg_cancel(skb, nlh);
5342 return -EMSGSIZE;
1da177e4
LT		 5343}
5344
5345static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5346{
3b1e0a65 5347 struct net *net = sock_net(skb->sk);
84d2697d 5348 int h, s_h;
434a8a58 5349 int idx = 0, s_idx;
1da177e4
LT		 5350 struct net_device *dev;
5351 struct inet6_dev *idev;
84d2697d 5352 struct hlist_head *head;
1da177e4 5353
84d2697d
ED		 5354 s_h = cb->args[0];
5355 s_idx = cb->args[1];
5356
5357 rcu_read_lock();
5358 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5359 idx = 0;
5360 head = &net->dev_index_head[h];
b67bfe0d 5361 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5362 if (idx < s_idx)
5363 goto cont;
5364 idev = __in6_dev_get(dev);
5365 if (!idev)
5366 goto cont;
5367 if (inet6_fill_ifinfo(skb, idev,
15e47304 5368 NETLINK_CB(cb->skb).portid,
84d2697d 5369 cb->nlh->nlmsg_seq,
053c095a 5370 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5371 goto out;
7562f876 5372cont:
84d2697d
ED		 5373 idx++;
5374 }
1da177e4 5375 }
84d2697d
ED		 5376out:
5377 rcu_read_unlock();
5378 cb->args[1] = idx;
5379 cb->args[0] = h;
1da177e4
LT		 5380
5381 return skb->len;
5382}
5383
5384void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5385{
5386 struct sk_buff *skb;
c346dca1 5387 struct net *net = dev_net(idev->dev);
8d7a76c9 5388 int err = -ENOBUFS;
1ab1457c 5389
339bf98f 5390 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5391 if (!skb)
8d7a76c9
TG		 5392 goto errout;
5393
5394 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5395 if (err < 0) {
5396 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5397 WARN_ON(err == -EMSGSIZE);
5398 kfree_skb(skb);
5399 goto errout;
5400 }
5f75a104 5401 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5402 return;
8d7a76c9
TG		 5403errout:
5404 if (err < 0)
5f75a104 5405 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5406}
5407
339bf98f
TG		 5408static inline size_t inet6_prefix_nlmsg_size(void)
5409{
5410 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5411 + nla_total_size(sizeof(struct in6_addr))
5412 + nla_total_size(sizeof(struct prefix_cacheinfo));
5413}
c5396a31 5414
1da177e4 5415static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5416 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5417 int event, unsigned int flags)
1da177e4 5418{
6051e2f4
TG		 5419 struct prefixmsg *pmsg;
5420 struct nlmsghdr *nlh;
1da177e4
LT		 5421 struct prefix_cacheinfo ci;
5422
15e47304 5423 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5424 if (!nlh)
26932566 5425 return -EMSGSIZE;
6051e2f4
TG		 5426
5427 pmsg = nlmsg_data(nlh);
1da177e4 5428 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5429 pmsg->prefix_pad1 = 0;
5430 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5431 pmsg->prefix_ifindex = idev->dev->ifindex;
5432 pmsg->prefix_len = pinfo->prefix_len;
5433 pmsg->prefix_type = pinfo->type;
8a47077a 5434 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5435 pmsg->prefix_flags = 0;
5436 if (pinfo->onlink)
5437 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5438 if (pinfo->autoconf)
5439 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5440
c78679e8
DM		 5441 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5442 goto nla_put_failure;
1da177e4
LT		 5443 ci.preferred_time = ntohl(pinfo->prefered);
5444 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5445 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5446 goto nla_put_failure;
053c095a
JB		 5447 nlmsg_end(skb, nlh);
5448 return 0;
1da177e4 5449
6051e2f4 5450nla_put_failure:
26932566
PM		 5451 nlmsg_cancel(skb, nlh);
5452 return -EMSGSIZE;
1da177e4
LT		 5453}
5454
1ab1457c 5455static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5456 struct prefix_info *pinfo)
5457{
5458 struct sk_buff *skb;
c346dca1 5459 struct net *net = dev_net(idev->dev);
8c384bfa 5460 int err = -ENOBUFS;
1da177e4 5461
339bf98f 5462 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5463 if (!skb)
8c384bfa
TG		 5464 goto errout;
5465
5466 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5467 if (err < 0) {
5468 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5469 WARN_ON(err == -EMSGSIZE);
5470 kfree_skb(skb);
5471 goto errout;
5472 }
1ce85fe4
PNA		 5473 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5474 return;
8c384bfa
TG		 5475errout:
5476 if (err < 0)
6fda7350 5477 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5478}
5479
1da177e4
LT		 5480static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5481{
63998ac2
ND		 5482 struct net *net = dev_net(ifp->idev->dev);
5483
c15b1cca
HFS		 5484 if (event)
5485 ASSERT_RTNL();
5486
1da177e4
LT		 5487 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5488
5489 switch (event) {
5490 case RTM_NEWADDR:
95c385b4
NH		 5491 /*
5492 * If the address was optimistic
5493 * we inserted the route at the start of
5494 * our DAD process, so we don't need
5495 * to do it again
5496 */
5497 if (!(ifp->rt->rt6i_node))
5498 ip6_ins_rt(ifp->rt);
1da177e4
LT		 5499 if (ifp->idev->cnf.forwarding)
5500 addrconf_join_anycast(ifp);
7996c799 5501 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 5502 addrconf_prefix_route(&ifp->peer_addr, 128,
5503 ifp->idev->dev, 0, 0);
1da177e4
LT		 5504 break;
5505 case RTM_DELADDR:
5506 if (ifp->idev->cnf.forwarding)
5507 addrconf_leave_anycast(ifp);
5508 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5509 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 5510 struct rt6_info *rt;
caeaba79 5511
e7478dfc
ND		 5512 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5513 ifp->idev->dev, 0, 0);
8e3d5be7
MKL		 5514 if (rt)
5515 ip6_del_rt(rt);
caeaba79 5516 }
38bd10c4
DA		 5517 if (ifp->rt) {
5518 dst_hold(&ifp->rt->dst);
5519 ip6_del_rt(ifp->rt);
5520 }
705f1c86 5521 rt_genid_bump_ipv6(net);
1da177e4
LT		 5522 break;
5523 }
63998ac2 5524 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5525}
5526
5527static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5528{
8814c4b5 5529 rcu_read_lock_bh();
1da177e4
LT		 5530 if (likely(ifp->idev->dead == 0))
5531 __ipv6_ifa_notify(event, ifp);
8814c4b5 5532 rcu_read_unlock_bh();
1da177e4
LT		 5533}
5534
5535#ifdef CONFIG_SYSCTL
5536
5537static
fe2c6338 5538int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5539 void __user *buffer, size_t *lenp, loff_t *ppos)
5540{
5541 int *valp = ctl->data;
5542 int val = *valp;
88af182e 5543 loff_t pos = *ppos;
fe2c6338 5544 struct ctl_table lctl;
1da177e4
LT		 5545 int ret;
5546
013d97e9
FR		 5547 /*
5548 * ctl->data points to idev->cnf.forwarding, we should
5549 * not modify it until we get the rtnl lock.
5550 */
5551 lctl = *ctl;
5552 lctl.data = &val;
5553
5554 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5555
c8fecf22 5556 if (write)
b325fddb 5557 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5558 if (ret)
5559 *ppos = pos;
1ab1457c 5560 return ret;
1da177e4
LT		 5561}
5562
77751427
ML		 5563static
5564int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5565 void __user *buffer, size_t *lenp, loff_t *ppos)
5566{
5567 struct inet6_dev *idev = ctl->extra1;
5568 int min_mtu = IPV6_MIN_MTU;
5569 struct ctl_table lctl;
5570
5571 lctl = *ctl;
5572 lctl.extra1 = &min_mtu;
5573 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5574
5575 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5576}
5577
56d417b1
BH		 5578static void dev_disable_change(struct inet6_dev *idev)
5579{
75538c2b
CW		 5580 struct netdev_notifier_info info;
5581
56d417b1
BH		 5582 if (!idev || !idev->dev)
5583 return;
5584
75538c2b 5585 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5586 if (idev->cnf.disable_ipv6)
75538c2b 5587 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5588 else
75538c2b 5589 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5590}
5591
5592static void addrconf_disable_change(struct net *net, __s32 newf)
5593{
5594 struct net_device *dev;
5595 struct inet6_dev *idev;
5596
03e4deff 5597 for_each_netdev(net, dev) {
56d417b1
BH		 5598 idev = __in6_dev_get(dev);
5599 if (idev) {
5600 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5601 idev->cnf.disable_ipv6 = newf;
5602 if (changed)
5603 dev_disable_change(idev);
5604 }
56d417b1 5605 }
56d417b1
BH		 5606}
5607
013d97e9 5608static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5609{
5610 struct net *net;
013d97e9
FR		 5611 int old;
5612
5613 if (!rtnl_trylock())
5614 return restart_syscall();
56d417b1
BH		 5615
5616 net = (struct net *)table->extra2;
013d97e9
FR		 5617 old = *p;
5618 *p = newf;
56d417b1 5619
013d97e9
FR		 5620 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5621 rtnl_unlock();
56d417b1 5622 return 0;
88af182e 5623 }
56d417b1
BH		 5624
5625 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5626 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5627 addrconf_disable_change(net, newf);
013d97e9 5628 } else if ((!newf) ^ (!old))
56d417b1
BH		 5629 dev_disable_change((struct inet6_dev *)table->extra1);
5630
5631 rtnl_unlock();
5632 return 0;
5633}
5634
5635static
fe2c6338 5636int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5637 void __user *buffer, size_t *lenp, loff_t *ppos)
5638{
5639 int *valp = ctl->data;
5640 int val = *valp;
88af182e 5641 loff_t pos = *ppos;
fe2c6338 5642 struct ctl_table lctl;
56d417b1
BH		 5643 int ret;
5644
013d97e9
FR		 5645 /*
5646 * ctl->data points to idev->cnf.disable_ipv6, we should
5647 * not modify it until we get the rtnl lock.
5648 */
5649 lctl = *ctl;
5650 lctl.data = &val;
5651
5652 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5653
5654 if (write)
5655 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5656 if (ret)
5657 *ppos = pos;
56d417b1
BH		 5658 return ret;
5659}
5660
c92d5491 5661static
5662int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5663 void __user *buffer, size_t *lenp, loff_t *ppos)
5664{
5665 int *valp = ctl->data;
5666 int ret;
5667 int old, new;
5668
5669 old = *valp;
5670 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5671 new = *valp;
5672
5673 if (write && old != new) {
5674 struct net *net = ctl->extra2;
5675
5676 if (!rtnl_trylock())
5677 return restart_syscall();
5678
5679 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5680 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5681 NETCONFA_IFINDEX_DEFAULT,
5682 net->ipv6.devconf_dflt);
5683 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5684 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5685 NETCONFA_IFINDEX_ALL,
5686 net->ipv6.devconf_all);
5687 else {
5688 struct inet6_dev *idev = ctl->extra1;
5689
5690 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5691 idev->dev->ifindex,
5692 &idev->cnf);
5693 }
5694 rtnl_unlock();
5695 }
5696
5697 return ret;
5698}
5699
d35a00b8
FJ		 5700static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5701 void __user *buffer, size_t *lenp,
5702 loff_t *ppos)
5703{
5704 int ret = 0;
5705 int new_val;
5706 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5707 struct net *net = (struct net *)ctl->extra2;
5708
8c171d6c
FJ		 5709 if (!rtnl_trylock())
5710 return restart_syscall();
5711
d35a00b8
FJ		 5712 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5713
5714 if (write) {
5715 new_val = *((int *)ctl->data);
5716
8c171d6c
FJ		 5717 if (check_addr_gen_mode(new_val) < 0) {
5718 ret = -EINVAL;
5719 goto out;
5720 }
d35a00b8
FJ		 5721
5722 /* request for default */
5723 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5724 ipv6_devconf_dflt.addr_gen_mode = new_val;
5725
5726 /* request for individual net device */
5727 } else {
5728 if (!idev)
8c171d6c 5729 goto out;
d35a00b8 5730
8c171d6c
FJ		 5731 if (check_stable_privacy(idev, net, new_val) < 0) {
5732 ret = -EINVAL;
5733 goto out;
5734 }
d35a00b8
FJ		 5735
5736 if (idev->cnf.addr_gen_mode != new_val) {
5737 idev->cnf.addr_gen_mode = new_val;
d35a00b8 5738 addrconf_dev_config(idev->dev);
d35a00b8
FJ		 5739 }
5740 }
5741 }
5742
8c171d6c
FJ		 5743out:
5744 rtnl_unlock();
5745
d35a00b8
FJ		 5746 return ret;
5747}
5748
3d1bec99
HFS		 5749static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5750 void __user *buffer, size_t *lenp,
5751 loff_t *ppos)
5752{
5753 int err;
5754 struct in6_addr addr;
5755 char str[IPV6_MAX_STRLEN];
5756 struct ctl_table lctl = *ctl;
622c81d5 5757 struct net *net = ctl->extra2;
3d1bec99
HFS		 5758 struct ipv6_stable_secret *secret = ctl->data;
5759
622c81d5
HFS		 5760 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5761 return -EIO;
5762
3d1bec99
HFS		 5763 lctl.maxlen = IPV6_MAX_STRLEN;
5764 lctl.data = str;
5765
5766 if (!rtnl_trylock())
5767 return restart_syscall();
5768
5769 if (!write && !secret->initialized) {
5770 err = -EIO;
5771 goto out;
5772 }
5773
5449a5ca
WC		 5774 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5775 if (err >= sizeof(str)) {
5776 err = -EIO;
5777 goto out;
3d1bec99
HFS		 5778 }
5779
5780 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5781 if (err || !write)
5782 goto out;
5783
5784 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5785 err = -EIO;
5786 goto out;
5787 }
5788
5789 secret->initialized = true;
5790 secret->secret = addr;
5791
622c81d5
HFS		 5792 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5793 struct net_device *dev;
5794
5795 for_each_netdev(net, dev) {
5796 struct inet6_dev *idev = __in6_dev_get(dev);
5797
5798 if (idev) {
d35a00b8 5799 idev->cnf.addr_gen_mode =
622c81d5
HFS		 5800 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5801 }
5802 }
5803 } else {
5804 struct inet6_dev *idev = ctl->extra1;
5805
d35a00b8 5806 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
622c81d5
HFS		 5807 }
5808
3d1bec99
HFS		 5809out:
5810 rtnl_unlock();
5811
5812 return err;
5813}
c92d5491 5814
35103d11
AG		 5815static
5816int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5817 int write,
5818 void __user *buffer,
5819 size_t *lenp,
5820 loff_t *ppos)
5821{
5822 int *valp = ctl->data;
5823 int val = *valp;
5824 loff_t pos = *ppos;
5825 struct ctl_table lctl;
5826 int ret;
5827
5828 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5829 * we should not modify it until we get the rtnl lock.
5830 */
5831 lctl = *ctl;
5832 lctl.data = &val;
5833
5834 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5835
5836 if (write)
5837 ret = addrconf_fixup_linkdown(ctl, valp, val);
5838 if (ret)
5839 *ppos = pos;
5840 return ret;
5841}
5842
cb4a4c69 5843static int minus_one = -1;
cb9e684e
MŻ		 5844static const int one = 1;
5845static const int two_five_five = 255;
5846
607ea7cd 5847static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 5848 {
5849 .procname = "forwarding",
5850 .data = &ipv6_devconf.forwarding,
5851 .maxlen = sizeof(int),
5852 .mode = 0644,
5853 .proc_handler = addrconf_sysctl_forward,
5854 },
5855 {
5856 .procname = "hop_limit",
5857 .data = &ipv6_devconf.hop_limit,
5858 .maxlen = sizeof(int),
5859 .mode = 0644,
cb9e684e
MŻ		 5860 .proc_handler = proc_dointvec_minmax,
5861 .extra1 = (void *)&one,
5862 .extra2 = (void *)&two_five_five,
5df1f77f
KK		 5863 },
5864 {
5865 .procname = "mtu",
5866 .data = &ipv6_devconf.mtu6,
5867 .maxlen = sizeof(int),
5868 .mode = 0644,
5869 .proc_handler = addrconf_sysctl_mtu,
5870 },
5871 {
5872 .procname = "accept_ra",
5873 .data = &ipv6_devconf.accept_ra,
5874 .maxlen = sizeof(int),
5875 .mode = 0644,
5876 .proc_handler = proc_dointvec,
5877 },
5878 {
5879 .procname = "accept_redirects",
5880 .data = &ipv6_devconf.accept_redirects,
5881 .maxlen = sizeof(int),
5882 .mode = 0644,
5883 .proc_handler = proc_dointvec,
5884 },
5885 {
5886 .procname = "autoconf",
5887 .data = &ipv6_devconf.autoconf,
5888 .maxlen = sizeof(int),
5889 .mode = 0644,
5890 .proc_handler = proc_dointvec,
5891 },
5892 {
5893 .procname = "dad_transmits",
5894 .data = &ipv6_devconf.dad_transmits,
5895 .maxlen = sizeof(int),
5896 .mode = 0644,
5897 .proc_handler = proc_dointvec,
5898 },
5899 {
5900 .procname = "router_solicitations",
5901 .data = &ipv6_devconf.rtr_solicits,
5902 .maxlen = sizeof(int),
5903 .mode = 0644,
cb4a4c69
MŻ		 5904 .proc_handler = proc_dointvec_minmax,
5905 .extra1 = &minus_one,
5df1f77f
KK		 5906 },
5907 {
5908 .procname = "router_solicitation_interval",
5909 .data = &ipv6_devconf.rtr_solicit_interval,
5910 .maxlen = sizeof(int),
5911 .mode = 0644,
5912 .proc_handler = proc_dointvec_jiffies,
5913 },
bd11f074
MŻ		 5914 {
5915 .procname = "router_solicitation_max_interval",
5916 .data = &ipv6_devconf.rtr_solicit_max_interval,
5917 .maxlen = sizeof(int),
5918 .mode = 0644,
5919 .proc_handler = proc_dointvec_jiffies,
5920 },
5df1f77f
KK		 5921 {
5922 .procname = "router_solicitation_delay",
5923 .data = &ipv6_devconf.rtr_solicit_delay,
5924 .maxlen = sizeof(int),
5925 .mode = 0644,
5926 .proc_handler = proc_dointvec_jiffies,
5927 },
5928 {
5929 .procname = "force_mld_version",
5930 .data = &ipv6_devconf.force_mld_version,
5931 .maxlen = sizeof(int),
5932 .mode = 0644,
5933 .proc_handler = proc_dointvec,
5934 },
5935 {
5936 .procname = "mldv1_unsolicited_report_interval",
5937 .data =
5938 &ipv6_devconf.mldv1_unsolicited_report_interval,
5939 .maxlen = sizeof(int),
5940 .mode = 0644,
5941 .proc_handler = proc_dointvec_ms_jiffies,
5942 },
5943 {
5944 .procname = "mldv2_unsolicited_report_interval",
5945 .data =
5946 &ipv6_devconf.mldv2_unsolicited_report_interval,
5947 .maxlen = sizeof(int),
5948 .mode = 0644,
5949 .proc_handler = proc_dointvec_ms_jiffies,
5950 },
5951 {
5952 .procname = "use_tempaddr",
5953 .data = &ipv6_devconf.use_tempaddr,
5954 .maxlen = sizeof(int),
5955 .mode = 0644,
5956 .proc_handler = proc_dointvec,
5957 },
5958 {
5959 .procname = "temp_valid_lft",
5960 .data = &ipv6_devconf.temp_valid_lft,
5961 .maxlen = sizeof(int),
5962 .mode = 0644,
5963 .proc_handler = proc_dointvec,
5964 },
5965 {
5966 .procname = "temp_prefered_lft",
5967 .data = &ipv6_devconf.temp_prefered_lft,
5968 .maxlen = sizeof(int),
5969 .mode = 0644,
5970 .proc_handler = proc_dointvec,
5971 },
5972 {
5973 .procname = "regen_max_retry",
5974 .data = &ipv6_devconf.regen_max_retry,
5975 .maxlen = sizeof(int),
5976 .mode = 0644,
5977 .proc_handler = proc_dointvec,
5978 },
5979 {
5980 .procname = "max_desync_factor",
5981 .data = &ipv6_devconf.max_desync_factor,
5982 .maxlen = sizeof(int),
5983 .mode = 0644,
5984 .proc_handler = proc_dointvec,
5985 },
5986 {
5987 .procname = "max_addresses",
5988 .data = &ipv6_devconf.max_addresses,
5989 .maxlen = sizeof(int),
5990 .mode = 0644,
5991 .proc_handler = proc_dointvec,
5992 },
5993 {
5994 .procname = "accept_ra_defrtr",
5995 .data = &ipv6_devconf.accept_ra_defrtr,
5996 .maxlen = sizeof(int),
5997 .mode = 0644,
5998 .proc_handler = proc_dointvec,
5999 },
6000 {
6001 .procname = "accept_ra_min_hop_limit",
6002 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6003 .maxlen = sizeof(int),
6004 .mode = 0644,
6005 .proc_handler = proc_dointvec,
6006 },
6007 {
6008 .procname = "accept_ra_pinfo",
6009 .data = &ipv6_devconf.accept_ra_pinfo,
6010 .maxlen = sizeof(int),
6011 .mode = 0644,
6012 .proc_handler = proc_dointvec,
6013 },
930d6ff2 6014#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 6015 {
6016 .procname = "accept_ra_rtr_pref",
6017 .data = &ipv6_devconf.accept_ra_rtr_pref,
6018 .maxlen = sizeof(int),
6019 .mode = 0644,
6020 .proc_handler = proc_dointvec,
6021 },
6022 {
6023 .procname = "router_probe_interval",
6024 .data = &ipv6_devconf.rtr_probe_interval,
6025 .maxlen = sizeof(int),
6026 .mode = 0644,
6027 .proc_handler = proc_dointvec_jiffies,
6028 },
fa03ef38 6029#ifdef CONFIG_IPV6_ROUTE_INFO
5df1f77f
KK		 6030 {
6031 .procname = "accept_ra_rt_info_max_plen",
6032 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6033 .maxlen = sizeof(int),
6034 .mode = 0644,
6035 .proc_handler = proc_dointvec,
6036 },
09c884d4 6037#endif
930d6ff2 6038#endif
5df1f77f
KK		 6039 {
6040 .procname = "proxy_ndp",
6041 .data = &ipv6_devconf.proxy_ndp,
6042 .maxlen = sizeof(int),
6043 .mode = 0644,
6044 .proc_handler = addrconf_sysctl_proxy_ndp,
6045 },
6046 {
6047 .procname = "accept_source_route",
6048 .data = &ipv6_devconf.accept_source_route,
6049 .maxlen = sizeof(int),
6050 .mode = 0644,
6051 .proc_handler = proc_dointvec,
6052 },
95c385b4 6053#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 6054 {
6055 .procname = "optimistic_dad",
6056 .data = &ipv6_devconf.optimistic_dad,
6057 .maxlen = sizeof(int),
6058 .mode = 0644,
6059 .proc_handler = proc_dointvec,
6060 },
6061 {
6062 .procname = "use_optimistic",
6063 .data = &ipv6_devconf.use_optimistic,
6064 .maxlen = sizeof(int),
6065 .mode = 0644,
6066 .proc_handler = proc_dointvec,
6067 },
7bc570c8
YH		 6068#endif
6069#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 6070 {
6071 .procname = "mc_forwarding",
6072 .data = &ipv6_devconf.mc_forwarding,
6073 .maxlen = sizeof(int),
6074 .mode = 0444,
6075 .proc_handler = proc_dointvec,
6076 },
95c385b4 6077#endif
5df1f77f
KK		 6078 {
6079 .procname = "disable_ipv6",
6080 .data = &ipv6_devconf.disable_ipv6,
6081 .maxlen = sizeof(int),
6082 .mode = 0644,
6083 .proc_handler = addrconf_sysctl_disable,
6084 },
6085 {
6086 .procname = "accept_dad",
6087 .data = &ipv6_devconf.accept_dad,
6088 .maxlen = sizeof(int),
6089 .mode = 0644,
6090 .proc_handler = proc_dointvec,
6091 },
6092 {
6093 .procname = "force_tllao",
6094 .data = &ipv6_devconf.force_tllao,
6095 .maxlen = sizeof(int),
6096 .mode = 0644,
6097 .proc_handler = proc_dointvec
6098 },
6099 {
6100 .procname = "ndisc_notify",
6101 .data = &ipv6_devconf.ndisc_notify,
6102 .maxlen = sizeof(int),
6103 .mode = 0644,
6104 .proc_handler = proc_dointvec
6105 },
6106 {
6107 .procname = "suppress_frag_ndisc",
6108 .data = &ipv6_devconf.suppress_frag_ndisc,
6109 .maxlen = sizeof(int),
6110 .mode = 0644,
6111 .proc_handler = proc_dointvec
6112 },
6113 {
6114 .procname = "accept_ra_from_local",
6115 .data = &ipv6_devconf.accept_ra_from_local,
6116 .maxlen = sizeof(int),
6117 .mode = 0644,
6118 .proc_handler = proc_dointvec,
6119 },
6120 {
6121 .procname = "accept_ra_mtu",
6122 .data = &ipv6_devconf.accept_ra_mtu,
6123 .maxlen = sizeof(int),
6124 .mode = 0644,
6125 .proc_handler = proc_dointvec,
6126 },
6127 {
6128 .procname = "stable_secret",
6129 .data = &ipv6_devconf.stable_secret,
6130 .maxlen = IPV6_MAX_STRLEN,
6131 .mode = 0600,
6132 .proc_handler = addrconf_sysctl_stable_secret,
6133 },
6134 {
6135 .procname = "use_oif_addrs_only",
6136 .data = &ipv6_devconf.use_oif_addrs_only,
6137 .maxlen = sizeof(int),
6138 .mode = 0644,
6139 .proc_handler = proc_dointvec,
6140 },
6141 {
6142 .procname = "ignore_routes_with_linkdown",
6143 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6144 .maxlen = sizeof(int),
6145 .mode = 0644,
6146 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6147 },
6148 {
6149 .procname = "drop_unicast_in_l2_multicast",
6150 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6151 .maxlen = sizeof(int),
6152 .mode = 0644,
6153 .proc_handler = proc_dointvec,
6154 },
6155 {
6156 .procname = "drop_unsolicited_na",
6157 .data = &ipv6_devconf.drop_unsolicited_na,
6158 .maxlen = sizeof(int),
6159 .mode = 0644,
6160 .proc_handler = proc_dointvec,
6161 },
6162 {
6163 .procname = "keep_addr_on_down",
6164 .data = &ipv6_devconf.keep_addr_on_down,
6165 .maxlen = sizeof(int),
6166 .mode = 0644,
6167 .proc_handler = proc_dointvec,
6168
6169 },
1ababeba
DL		 6170 {
6171 .procname = "seg6_enabled",
6172 .data = &ipv6_devconf.seg6_enabled,
6173 .maxlen = sizeof(int),
6174 .mode = 0644,
6175 .proc_handler = proc_dointvec,
6176 },
bf355b8d
DL		 6177#ifdef CONFIG_IPV6_SEG6_HMAC
6178 {
6179 .procname = "seg6_require_hmac",
6180 .data = &ipv6_devconf.seg6_require_hmac,
6181 .maxlen = sizeof(int),
6182 .mode = 0644,
6183 .proc_handler = proc_dointvec,
6184 },
6185#endif
adc176c5
EN		 6186 {
6187 .procname = "enhanced_dad",
6188 .data = &ipv6_devconf.enhanced_dad,
6189 .maxlen = sizeof(int),
6190 .mode = 0644,
6191 .proc_handler = proc_dointvec,
6192 },
d35a00b8
FJ		 6193 {
6194 .procname = "addr_gen_mode",
6195 .data = &ipv6_devconf.addr_gen_mode,
6196 .maxlen = sizeof(int),
6197 .mode = 0644,
6198 .proc_handler = addrconf_sysctl_addr_gen_mode,
6199 },
5df1f77f
KK		 6200 {
6201 /* sentinel */
6202 }
1da177e4
LT		 6203};
6204
bff16c2f 6205static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 6206 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4 6207{
29c994e3 6208 int i, ifindex;
607ea7cd 6209 struct ctl_table *table;
6105e293 6210 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 6211
607ea7cd
KK		 6212 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6213 if (!table)
f68635e6
PE		 6214 goto out;
6215
607ea7cd
KK		 6216 for (i = 0; table[i].data; i++) {
6217 table[i].data += (char *)p - (char *)&ipv6_devconf;
cb9e684e
MŻ		 6218 /* If one of these is already set, then it is not safe to
6219 * overwrite either of them: this makes proc_dointvec_minmax
6220 * usable.
6221 */
6222 if (!table[i].extra1 && !table[i].extra2) {
6223 table[i].extra1 = idev; /* embedded; no ref */
6224 table[i].extra2 = net;
6225 }
1da177e4 6226 }
1da177e4 6227
6105e293 6228 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 6229
607ea7cd
KK		 6230 p->sysctl_header = register_net_sysctl(net, path, table);
6231 if (!p->sysctl_header)
6105e293 6232 goto free;
f68635e6 6233
29c994e3
ND		 6234 if (!strcmp(dev_name, "all"))
6235 ifindex = NETCONFA_IFINDEX_ALL;
6236 else if (!strcmp(dev_name, "default"))
6237 ifindex = NETCONFA_IFINDEX_DEFAULT;
6238 else
6239 ifindex = idev->dev->ifindex;
6240 inet6_netconf_notify_devconf(net, NETCONFA_ALL, ifindex, p);
95897312 6241 return 0;
1da177e4 6242
f68635e6 6243free:
607ea7cd 6244 kfree(table);
f68635e6 6245out:
95897312 6246 return -ENOBUFS;
1da177e4
LT		 6247}
6248
408c4768
PE		 6249static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
6250{
607ea7cd 6251 struct ctl_table *table;
408c4768 6252
607ea7cd 6253 if (!p->sysctl_header)
408c4768
PE		 6254 return;
6255
607ea7cd
KK		 6256 table = p->sysctl_header->ctl_table_arg;
6257 unregister_net_sysctl_table(p->sysctl_header);
6258 p->sysctl_header = NULL;
6259 kfree(table);
408c4768
PE		 6260}
6261
a317a2f1 6262static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 6263{
a317a2f1
WC		 6264 int err;
6265
6266 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6267 return -EINVAL;
6268
6269 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6270 &ndisc_ifinfo_sysctl_change);
6271 if (err)
6272 return err;
6273 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6274 idev, &idev->cnf);
6275 if (err)
6276 neigh_sysctl_unregister(idev->nd_parms);
6277
6278 return err;
f52295a9
PE		 6279}
6280
408c4768 6281static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 6282{
408c4768
PE		 6283 __addrconf_sysctl_unregister(&idev->cnf);
6284 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 6285}
6286
6287
6288#endif
6289
2c8c1e72 6290static int __net_init addrconf_init_net(struct net *net)
e0da5a48 6291{
a79ca223 6292 int err = -ENOMEM;
e0da5a48
PE		 6293 struct ipv6_devconf *all, *dflt;
6294
a79ca223 6295 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 6296 if (!all)
a79ca223 6297 goto err_alloc_all;
e0da5a48 6298
a79ca223 6299 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 6300 if (!dflt)
a79ca223 6301 goto err_alloc_dflt;
e0da5a48 6302
a79ca223
HZ		 6303 /* these will be inherited by all namespaces */
6304 dflt->autoconf = ipv6_defaults.autoconf;
6305 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 6306
3d1bec99
HFS		 6307 dflt->stable_secret.initialized = false;
6308 all->stable_secret.initialized = false;
6309
e0da5a48
PE		 6310 net->ipv6.devconf_all = all;
6311 net->ipv6.devconf_dflt = dflt;
6312
6313#ifdef CONFIG_SYSCTL
f8572d8f 6314 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 6315 if (err < 0)
6316 goto err_reg_all;
6317
f8572d8f 6318 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 6319 if (err < 0)
6320 goto err_reg_dflt;
6321#endif
6322 return 0;
6323
6324#ifdef CONFIG_SYSCTL
6325err_reg_dflt:
6326 __addrconf_sysctl_unregister(all);
6327err_reg_all:
6328 kfree(dflt);
6329#endif
6330err_alloc_dflt:
6331 kfree(all);
6332err_alloc_all:
6333 return err;
6334}
6335
2c8c1e72 6336static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 6337{
6338#ifdef CONFIG_SYSCTL
6339 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
6340 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
6341#endif
73cf0e92 6342 kfree(net->ipv6.devconf_dflt);
6343 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 6344}
6345
6346static struct pernet_operations addrconf_ops = {
6347 .init = addrconf_init_net,
6348 .exit = addrconf_exit_net,
6349};
6350
207895fd 6351static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 6352 .family = AF_INET6,
6353 .fill_link_af = inet6_fill_link_af,
6354 .get_link_af_size = inet6_get_link_af_size,
11b1f828 6355 .validate_link_af = inet6_validate_link_af,
f53adae4 6356 .set_link_af = inet6_set_link_af,
b382b191
TG		 6357};
6358
1da177e4
LT		 6359/*
6360 * Init / cleanup code
6361 */
6362
6363int __init addrconf_init(void)
6364{
a317a2f1 6365 struct inet6_dev *idev;
c2e21293 6366 int i, err;
2a8cc6c8 6367
e21e8467
SH		 6368 err = ipv6_addr_label_init();
6369 if (err < 0) {
f3213831
JP		 6370 pr_crit("%s: cannot initialize default policy table: %d\n",
6371 __func__, err);
2cc6d2bf 6372 goto out;
2a8cc6c8 6373 }
1da177e4 6374
2cc6d2bf
NH		 6375 err = register_pernet_subsys(&addrconf_ops);
6376 if (err < 0)
6377 goto out_addrlabel;
e0da5a48 6378
c15b1cca
HFS		 6379 addrconf_wq = create_workqueue("ipv6_addrconf");
6380 if (!addrconf_wq) {
6381 err = -ENOMEM;
6382 goto out_nowq;
6383 }
6384
1da177e4
LT		 6385 /* The addrconf netdev notifier requires that loopback_dev
6386 * has it's ipv6 private information allocated and setup
6387 * before it can bring up and give link-local addresses
6388 * to other devices which are up.
6389 *
6390 * Unfortunately, loopback_dev is not necessarily the first
6391 * entry in the global dev_base list of net devices. In fact,
6392 * it is likely to be the very last entry on that list.
6393 * So this causes the notifier registry below to try and
6394 * give link-local addresses to all devices besides loopback_dev
6395 * first, then loopback_dev, which cases all the non-loopback_dev
6396 * devices to fail to get a link-local address.
6397 *
6398 * So, as a temporary fix, allocate the ipv6 structure for
6399 * loopback_dev first by hand.
6400 * Longer term, all of the dependencies ipv6 has upon the loopback
6401 * device and it being up should be removed.
6402 */
6403 rtnl_lock();
a317a2f1 6404 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 6405 rtnl_unlock();
a317a2f1
WC		 6406 if (IS_ERR(idev)) {
6407 err = PTR_ERR(idev);
e0da5a48 6408 goto errlo;
a317a2f1 6409 }
1da177e4 6410
c2e21293 6411 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6412 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6413
1da177e4
LT		 6414 register_netdevice_notifier(&ipv6_dev_notf);
6415
c15b1cca 6416 addrconf_verify();
c127ea2c 6417
3678a9d8 6418 rtnl_af_register(&inet6_ops);
b382b191 6419
c7ac8679
GR		 6420 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6421 NULL);
c127ea2c
TG		 6422 if (err < 0)
6423 goto errout;
6424
6425 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 6426 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6427 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6428 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6429 inet6_dump_ifaddr, NULL);
6430 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6431 inet6_dump_ifmcaddr, NULL);
6432 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6433 inet6_dump_ifacaddr, NULL);
76f8f6cb 6434 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 6435 inet6_netconf_dump_devconf, NULL);
c127ea2c 6436
2a8cc6c8
YH		 6437 ipv6_addr_label_rtnl_register();
6438
1da177e4 6439 return 0;
c127ea2c 6440errout:
b382b191 6441 rtnl_af_unregister(&inet6_ops);
c127ea2c 6442 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6443errlo:
c15b1cca
HFS		 6444 destroy_workqueue(addrconf_wq);
6445out_nowq:
e0da5a48 6446 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 6447out_addrlabel:
6448 ipv6_addr_label_cleanup();
6449out:
c127ea2c 6450 return err;
1da177e4
LT		 6451}
6452
09f7709f 6453void addrconf_cleanup(void)
1da177e4 6454{
176c39af 6455 struct net_device *dev;
1da177e4
LT		 6456 int i;
6457
6458 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6459 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 6460 ipv6_addr_label_cleanup();
1da177e4
LT		 6461
6462 rtnl_lock();
6463
b382b191
TG		 6464 __rtnl_af_unregister(&inet6_ops);
6465
176c39af
DL		 6466 /* clean dev list */
6467 for_each_netdev(&init_net, dev) {
6468 if (__in6_dev_get(dev) == NULL)
6469 continue;
6470 addrconf_ifdown(dev, 1);
6471 }
6472 addrconf_ifdown(init_net.loopback_dev, 2);
6473
1da177e4
LT		 6474 /*
6475 * Check hash table.
6476 */
5c578aed 6477 spin_lock_bh(&addrconf_hash_lock);
c2e21293 6478 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6479 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 6480 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 6481 cancel_delayed_work(&addr_chk_work);
1da177e4 6482 rtnl_unlock();
c15b1cca
HFS		 6483
6484 destroy_workqueue(addrconf_wq);
1da177e4 6485}
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