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IPv6: fix DESYNC_FACTOR
[mirror_ubuntu-bionic-kernel.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
1da177e4
LT		 46#include <linux/socket.h>
47#include <linux/sockios.h>
1da177e4 48#include <linux/net.h>
3d1bec99 49#include <linux/inet.h>
1da177e4
LT		 50#include <linux/in6.h>
51#include <linux/netdevice.h>
1823730f 52#include <linux/if_addr.h>
1da177e4
LT		 53#include <linux/if_arp.h>
54#include <linux/if_arcnet.h>
55#include <linux/if_infiniband.h>
56#include <linux/route.h>
57#include <linux/inetdevice.h>
58#include <linux/init.h>
5a0e3ad6 59#include <linux/slab.h>
1da177e4
LT		 60#ifdef CONFIG_SYSCTL
61#include <linux/sysctl.h>
62#endif
4fc268d2 63#include <linux/capability.h>
1da177e4
LT		 64#include <linux/delay.h>
65#include <linux/notifier.h>
543537bd 66#include <linux/string.h>
ddbe5032 67#include <linux/hash.h>
1da177e4 68
457c4cbc 69#include <net/net_namespace.h>
1da177e4
LT		 70#include <net/sock.h>
71#include <net/snmp.h>
72
5241c2d7 73#include <net/6lowpan.h>
cb6bf355 74#include <net/firewire.h>
1da177e4
LT		 75#include <net/ipv6.h>
76#include <net/protocol.h>
77#include <net/ndisc.h>
78#include <net/ip6_route.h>
79#include <net/addrconf.h>
80#include <net/tcp.h>
81#include <net/ip.h>
5d620266 82#include <net/netlink.h>
f24e3d65 83#include <net/pkt_sched.h>
ca254490 84#include <net/l3mdev.h>
1da177e4
LT		 85#include <linux/if_tunnel.h>
86#include <linux/rtnetlink.h>
f3a1bfb1 87#include <linux/netconf.h>
1da177e4 88#include <linux/random.h>
e21e8467 89#include <linux/uaccess.h>
7f7d9a6b 90#include <asm/unaligned.h>
1da177e4
LT		 91
92#include <linux/proc_fs.h>
93#include <linux/seq_file.h>
bc3b2d7f 94#include <linux/export.h>
1da177e4
LT		 95
96/* Set to 3 to get tracing... */
97#define ACONF_DEBUG 2
98
99#if ACONF_DEBUG >= 3
ba3542e1 100#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
1da177e4 101#else
ba3542e1 102#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
1da177e4
LT		 103#endif
104
105#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e 106
3d1bec99
HFS		 107#define IPV6_MAX_STRLEN \
108 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
109
18a31e1e
TG		 110static inline u32 cstamp_delta(unsigned long cstamp)
111{
112 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
113}
1da177e4 114
bd11f074
MŻ		 115static inline s32 rfc3315_s14_backoff_init(s32 irt)
116{
117 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
118 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
119 do_div(tmp, 1000000);
120 return (s32)tmp;
121}
122
123static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
124{
125 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
126 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
127 do_div(tmp, 1000000);
128 if ((s32)tmp > mrt) {
129 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
130 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
131 do_div(tmp, 1000000);
132 }
133 return (s32)tmp;
134}
135
1da177e4 136#ifdef CONFIG_SYSCTL
a317a2f1 137static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 138static void addrconf_sysctl_unregister(struct inet6_dev *idev);
139#else
a317a2f1 140static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 141{
a317a2f1 142 return 0;
408c4768
PE		 143}
144
145static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
146{
147}
1da177e4
LT		 148#endif
149
9d6280da
JB		 150static void ipv6_regen_rndid(struct inet6_dev *idev);
151static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 152
1b34be74 153static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4 154static int ipv6_count_addresses(struct inet6_dev *idev);
622c81d5
HFS		 155static int ipv6_generate_stable_address(struct in6_addr *addr,
156 u8 dad_count,
157 const struct inet6_dev *idev);
1da177e4
LT		 158
159/*
160 * Configured unicast address hash table
161 */
c2e21293 162static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 163static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 164
c15b1cca
HFS		 165static void addrconf_verify(void);
166static void addrconf_verify_rtnl(void);
167static void addrconf_verify_work(struct work_struct *);
1da177e4 168
c15b1cca
HFS		 169static struct workqueue_struct *addrconf_wq;
170static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 171
172static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
173static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
174
93d9b7d7
JP		 175static void addrconf_type_change(struct net_device *dev,
176 unsigned long event);
1da177e4
LT		 177static int addrconf_ifdown(struct net_device *dev, int how);
178
21caa662
RK		 179static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
180 int plen,
181 const struct net_device *dev,
182 u32 flags, u32 noflags);
183
cf22f9a2 184static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 185static void addrconf_dad_work(struct work_struct *w);
1da177e4 186static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 187static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 188static void addrconf_rs_timer(unsigned long data);
189static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
190static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
191
1ab1457c 192static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 193 struct prefix_info *pinfo);
3e81c6da
DM		 194static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
195 struct net_device *dev);
1da177e4 196
888c848e 197static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 198 .forwarding = 0,
199 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
200 .mtu6 = IPV6_MIN_MTU,
201 .accept_ra = 1,
202 .accept_redirects = 1,
203 .autoconf = 1,
204 .force_mld_version = 0,
fc4eba58
HFS		 205 .mldv1_unsolicited_report_interval = 10 * HZ,
206 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 207 .dad_transmits = 1,
208 .rtr_solicits = MAX_RTR_SOLICITATIONS,
209 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 210 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 211 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 212 .use_tempaddr = 0,
1da177e4
LT		 213 .temp_valid_lft = TEMP_VALID_LIFETIME,
214 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
215 .regen_max_retry = REGEN_MAX_RETRY,
216 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 217 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 218 .accept_ra_defrtr = 1,
d9333196 219 .accept_ra_from_local = 0,
8013d1d7 220 .accept_ra_min_hop_limit= 1,
c4fd30eb 221 .accept_ra_pinfo = 1,
930d6ff2
YH		 222#ifdef CONFIG_IPV6_ROUTER_PREF
223 .accept_ra_rtr_pref = 1,
52e16356 224 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 225#ifdef CONFIG_IPV6_ROUTE_INFO
226 .accept_ra_rt_info_max_plen = 0,
227#endif
930d6ff2 228#endif
fbea49e1 229 .proxy_ndp = 0,
0bcbc926 230 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 231 .disable_ipv6 = 0,
1b34be74 232 .accept_dad = 1,
b800c3b9 233 .suppress_frag_ndisc = 1,
c2943f14 234 .accept_ra_mtu = 1,
3d1bec99
HFS		 235 .stable_secret = {
236 .initialized = false,
3985e8a3
EK		 237 },
238 .use_oif_addrs_only = 0,
35103d11 239 .ignore_routes_with_linkdown = 0,
f1705ec1 240 .keep_addr_on_down = 0,
1da177e4
LT		 241};
242
ab32ea5d 243static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 244 .forwarding = 0,
245 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
246 .mtu6 = IPV6_MIN_MTU,
247 .accept_ra = 1,
248 .accept_redirects = 1,
249 .autoconf = 1,
fc4eba58
HFS		 250 .force_mld_version = 0,
251 .mldv1_unsolicited_report_interval = 10 * HZ,
252 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 253 .dad_transmits = 1,
254 .rtr_solicits = MAX_RTR_SOLICITATIONS,
255 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 256 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 257 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 258 .use_tempaddr = 0,
259 .temp_valid_lft = TEMP_VALID_LIFETIME,
260 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
261 .regen_max_retry = REGEN_MAX_RETRY,
262 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 263 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 264 .accept_ra_defrtr = 1,
d9333196 265 .accept_ra_from_local = 0,
8013d1d7 266 .accept_ra_min_hop_limit= 1,
c4fd30eb 267 .accept_ra_pinfo = 1,
930d6ff2
YH		 268#ifdef CONFIG_IPV6_ROUTER_PREF
269 .accept_ra_rtr_pref = 1,
52e16356 270 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 271#ifdef CONFIG_IPV6_ROUTE_INFO
272 .accept_ra_rt_info_max_plen = 0,
273#endif
930d6ff2 274#endif
fbea49e1 275 .proxy_ndp = 0,
0bcbc926 276 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 277 .disable_ipv6 = 0,
1b34be74 278 .accept_dad = 1,
b800c3b9 279 .suppress_frag_ndisc = 1,
c2943f14 280 .accept_ra_mtu = 1,
3d1bec99
HFS		 281 .stable_secret = {
282 .initialized = false,
283 },
3985e8a3 284 .use_oif_addrs_only = 0,
35103d11 285 .ignore_routes_with_linkdown = 0,
f1705ec1 286 .keep_addr_on_down = 0,
1da177e4
LT		 287};
288
f24e3d65 289/* Check if a valid qdisc is available */
05297949 290static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 291{
05297949 292 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 293}
294
b7b1bfce 295static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 296{
b7b1bfce
HFS		 297 if (del_timer(&idev->rs_timer))
298 __in6_dev_put(idev);
299}
300
c15b1cca 301static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 302{
c15b1cca 303 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 304 __in6_ifa_put(ifp);
305}
306
b7b1bfce
HFS		 307static void addrconf_mod_rs_timer(struct inet6_dev *idev,
308 unsigned long when)
309{
310 if (!timer_pending(&idev->rs_timer))
311 in6_dev_hold(idev);
312 mod_timer(&idev->rs_timer, jiffies + when);
313}
1da177e4 314
c15b1cca
HFS		 315static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
316 unsigned long delay)
1da177e4 317{
c15b1cca 318 if (!delayed_work_pending(&ifp->dad_work))
1da177e4 319 in6_ifa_hold(ifp);
c15b1cca 320 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
1da177e4
LT		 321}
322
7f7d9a6b
HX		 323static int snmp6_alloc_dev(struct inet6_dev *idev)
324{
827da44c
JS		 325 int i;
326
698365fa
WC		 327 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
328 if (!idev->stats.ipv6)
7f7d9a6b 329 goto err_ip;
827da44c
JS		 330
331 for_each_possible_cpu(i) {
332 struct ipstats_mib *addrconf_stats;
698365fa 333 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 334 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 335 }
336
337
be281e55
ED		 338 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
339 GFP_KERNEL);
340 if (!idev->stats.icmpv6dev)
7f7d9a6b 341 goto err_icmp;
be281e55
ED		 342 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
343 GFP_KERNEL);
344 if (!idev->stats.icmpv6msgdev)
14878f75 345 goto err_icmpmsg;
7f7d9a6b
HX		 346
347 return 0;
348
14878f75 349err_icmpmsg:
be281e55 350 kfree(idev->stats.icmpv6dev);
7f7d9a6b 351err_icmp:
698365fa 352 free_percpu(idev->stats.ipv6);
7f7d9a6b 353err_ip:
aaf70ec7 354 return -ENOMEM;
7f7d9a6b
HX		 355}
356
8e5e8f30 357static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 358{
359 struct inet6_dev *ndev;
a317a2f1 360 int err = -ENOMEM;
1da177e4
LT		 361
362 ASSERT_RTNL();
363
364 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 365 return ERR_PTR(-EINVAL);
1da177e4 366
1ab1457c 367 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
63159f29 368 if (!ndev)
a317a2f1 369 return ERR_PTR(err);
322f74a4
IO		 370
371 rwlock_init(&ndev->lock);
372 ndev->dev = dev;
502a2ffd 373 INIT_LIST_HEAD(&ndev->addr_list);
b7b1bfce
HFS		 374 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
375 (unsigned long)ndev);
c346dca1 376 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
9b29c696
HFS		 377
378 if (ndev->cnf.stable_secret.initialized)
379 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
380 else
381 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64;
382
322f74a4 383 ndev->cnf.mtu6 = dev->mtu;
322f74a4 384 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
63159f29 385 if (!ndev->nd_parms) {
322f74a4 386 kfree(ndev);
a317a2f1 387 return ERR_PTR(err);
322f74a4 388 }
0187bdfb
BH		 389 if (ndev->cnf.forwarding)
390 dev_disable_lro(dev);
322f74a4
IO		 391 /* We refer to the device */
392 dev_hold(dev);
1da177e4 393
322f74a4 394 if (snmp6_alloc_dev(ndev) < 0) {
ba3542e1 395 ADBG(KERN_WARNING
f3213831 396 "%s: cannot allocate memory for statistics; dev=%s.\n",
ba3542e1 397 __func__, dev->name);
322f74a4 398 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 399 dev_put(dev);
400 kfree(ndev);
a317a2f1 401 return ERR_PTR(err);
322f74a4 402 }
1da177e4 403
322f74a4 404 if (snmp6_register_dev(ndev) < 0) {
ba3542e1 405 ADBG(KERN_WARNING
f3213831 406 "%s: cannot create /proc/net/dev_snmp6/%s\n",
ba3542e1 407 __func__, dev->name);
a317a2f1 408 goto err_release;
322f74a4
IO		 409 }
410
9d6280da 411 /* One reference from device. */
322f74a4 412 in6_dev_hold(ndev);
1da177e4 413
1b34be74
YH		 414 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
415 ndev->cnf.accept_dad = -1;
416
07a93626 417#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 418 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 419 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 420 ndev->cnf.rtr_solicits = 0;
421 }
422#endif
423
372e6c8f 424 INIT_LIST_HEAD(&ndev->tempaddr_list);
76506a98 425 ndev->desync_factor = U32_MAX;
322f74a4
IO		 426 if ((dev->flags&IFF_LOOPBACK) ||
427 dev->type == ARPHRD_TUNNEL ||
9625ed72 428 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 429 dev->type == ARPHRD_SIT ||
0be669bb 430 dev->type == ARPHRD_NONE) {
322f74a4 431 ndev->cnf.use_tempaddr = -1;
9d6280da
JB		 432 } else
433 ipv6_regen_rndid(ndev);
5d9efa7e 434
914faa14 435 ndev->token = in6addr_any;
1da177e4 436
f24e3d65 437 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 438 ndev->if_flags |= IF_READY;
439
322f74a4
IO		 440 ipv6_mc_init_dev(ndev);
441 ndev->tstamp = jiffies;
a317a2f1
WC		 442 err = addrconf_sysctl_register(ndev);
443 if (err) {
444 ipv6_mc_destroy_dev(ndev);
2a189f9e 445 snmp6_unregister_dev(ndev);
a317a2f1
WC		 446 goto err_release;
447 }
30c4cf57 448 /* protected by rtnl_lock */
cf778b00 449 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 450
2c5e8933
HFS		 451 /* Join interface-local all-node multicast group */
452 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
453
d88ae4cc 454 /* Join all-node multicast group */
f3ee4010 455 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 456
d6ddef9e 457 /* Join all-router multicast group if forwarding is set */
8b2aaede 458 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 459 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
460
1da177e4 461 return ndev;
a317a2f1
WC		 462
463err_release:
464 neigh_parms_release(&nd_tbl, ndev->nd_parms);
465 ndev->dead = 1;
466 in6_dev_finish_destroy(ndev);
467 return ERR_PTR(err);
1da177e4
LT		 468}
469
8e5e8f30 470static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 471{
472 struct inet6_dev *idev;
473
474 ASSERT_RTNL();
475
e21e8467
SH		 476 idev = __in6_dev_get(dev);
477 if (!idev) {
478 idev = ipv6_add_dev(dev);
a317a2f1 479 if (IS_ERR(idev))
1da177e4
LT		 480 return NULL;
481 }
c5e33bdd 482
1da177e4
LT		 483 if (dev->flags&IFF_UP)
484 ipv6_mc_up(idev);
485 return idev;
486}
487
f3a1bfb1
ND		 488static int inet6_netconf_msgsize_devconf(int type)
489{
490 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
491 + nla_total_size(4); /* NETCONFA_IFINDEX */
136ba622 492 bool all = false;
f3a1bfb1 493
136ba622
ZS		 494 if (type == NETCONFA_ALL)
495 all = true;
496
497 if (all || type == NETCONFA_FORWARDING)
f3a1bfb1 498 size += nla_total_size(4);
b1afce95 499#ifdef CONFIG_IPV6_MROUTE
136ba622 500 if (all || type == NETCONFA_MC_FORWARDING)
d67b8c61 501 size += nla_total_size(4);
b1afce95 502#endif
136ba622 503 if (all || type == NETCONFA_PROXY_NEIGH)
c92d5491 504 size += nla_total_size(4);
f3a1bfb1 505
136ba622 506 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
35103d11
AG		 507 size += nla_total_size(4);
508
f3a1bfb1
ND		 509 return size;
510}
511
512static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
513 struct ipv6_devconf *devconf, u32 portid,
514 u32 seq, int event, unsigned int flags,
515 int type)
516{
517 struct nlmsghdr *nlh;
518 struct netconfmsg *ncm;
136ba622 519 bool all = false;
f3a1bfb1
ND		 520
521 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
522 flags);
63159f29 523 if (!nlh)
f3a1bfb1
ND		 524 return -EMSGSIZE;
525
136ba622
ZS		 526 if (type == NETCONFA_ALL)
527 all = true;
528
f3a1bfb1
ND		 529 ncm = nlmsg_data(nlh);
530 ncm->ncm_family = AF_INET6;
531
532 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
533 goto nla_put_failure;
534
136ba622 535 if ((all || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 536 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
537 goto nla_put_failure;
b1afce95 538#ifdef CONFIG_IPV6_MROUTE
136ba622 539 if ((all || type == NETCONFA_MC_FORWARDING) &&
d67b8c61
ND		 540 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
541 devconf->mc_forwarding) < 0)
542 goto nla_put_failure;
b1afce95 543#endif
136ba622 544 if ((all || type == NETCONFA_PROXY_NEIGH) &&
c92d5491 545 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
546 goto nla_put_failure;
547
136ba622 548 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
35103d11
AG		 549 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
550 devconf->ignore_routes_with_linkdown) < 0)
551 goto nla_put_failure;
552
053c095a
JB		 553 nlmsg_end(skb, nlh);
554 return 0;
f3a1bfb1
ND		 555
556nla_put_failure:
557 nlmsg_cancel(skb, nlh);
558 return -EMSGSIZE;
559}
560
d67b8c61
ND		 561void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
562 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 563{
564 struct sk_buff *skb;
565 int err = -ENOBUFS;
566
927265bc 567 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
63159f29 568 if (!skb)
f3a1bfb1
ND		 569 goto errout;
570
571 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
572 RTM_NEWNETCONF, 0, type);
573 if (err < 0) {
574 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
575 WARN_ON(err == -EMSGSIZE);
576 kfree_skb(skb);
577 goto errout;
578 }
927265bc 579 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
f3a1bfb1
ND		 580 return;
581errout:
bd779028 582 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 583}
584
76f8f6cb
ND		 585static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
586 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
587 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 588 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
35103d11 589 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
76f8f6cb
ND		 590};
591
592static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 593 struct nlmsghdr *nlh)
76f8f6cb
ND		 594{
595 struct net *net = sock_net(in_skb->sk);
596 struct nlattr *tb[NETCONFA_MAX+1];
597 struct netconfmsg *ncm;
598 struct sk_buff *skb;
599 struct ipv6_devconf *devconf;
600 struct inet6_dev *in6_dev;
601 struct net_device *dev;
602 int ifindex;
603 int err;
604
605 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
606 devconf_ipv6_policy);
607 if (err < 0)
608 goto errout;
609
a97eb33f 610 err = -EINVAL;
76f8f6cb
ND		 611 if (!tb[NETCONFA_IFINDEX])
612 goto errout;
613
614 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
615 switch (ifindex) {
616 case NETCONFA_IFINDEX_ALL:
617 devconf = net->ipv6.devconf_all;
618 break;
619 case NETCONFA_IFINDEX_DEFAULT:
620 devconf = net->ipv6.devconf_dflt;
621 break;
622 default:
623 dev = __dev_get_by_index(net, ifindex);
63159f29 624 if (!dev)
76f8f6cb
ND		 625 goto errout;
626 in6_dev = __in6_dev_get(dev);
63159f29 627 if (!in6_dev)
76f8f6cb
ND		 628 goto errout;
629 devconf = &in6_dev->cnf;
630 break;
631 }
632
633 err = -ENOBUFS;
136ba622 634 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
63159f29 635 if (!skb)
76f8f6cb
ND		 636 goto errout;
637
638 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
639 NETLINK_CB(in_skb).portid,
640 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
136ba622 641 NETCONFA_ALL);
76f8f6cb
ND		 642 if (err < 0) {
643 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
644 WARN_ON(err == -EMSGSIZE);
645 kfree_skb(skb);
646 goto errout;
647 }
648 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
649errout:
650 return err;
651}
652
7a674200
ND		 653static int inet6_netconf_dump_devconf(struct sk_buff *skb,
654 struct netlink_callback *cb)
655{
656 struct net *net = sock_net(skb->sk);
657 int h, s_h;
658 int idx, s_idx;
659 struct net_device *dev;
660 struct inet6_dev *idev;
661 struct hlist_head *head;
662
663 s_h = cb->args[0];
664 s_idx = idx = cb->args[1];
665
666 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
667 idx = 0;
668 head = &net->dev_index_head[h];
669 rcu_read_lock();
63998ac2
ND		 670 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
671 net->dev_base_seq;
7a674200
ND		 672 hlist_for_each_entry_rcu(dev, head, index_hlist) {
673 if (idx < s_idx)
674 goto cont;
675 idev = __in6_dev_get(dev);
676 if (!idev)
677 goto cont;
678
679 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
680 &idev->cnf,
681 NETLINK_CB(cb->skb).portid,
682 cb->nlh->nlmsg_seq,
683 RTM_NEWNETCONF,
684 NLM_F_MULTI,
136ba622 685 NETCONFA_ALL) < 0) {
7a674200
ND		 686 rcu_read_unlock();
687 goto done;
688 }
63998ac2 689 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 690cont:
691 idx++;
692 }
693 rcu_read_unlock();
694 }
695 if (h == NETDEV_HASHENTRIES) {
696 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
697 net->ipv6.devconf_all,
698 NETLINK_CB(cb->skb).portid,
699 cb->nlh->nlmsg_seq,
700 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 701 NETCONFA_ALL) < 0)
7a674200
ND		 702 goto done;
703 else
704 h++;
705 }
706 if (h == NETDEV_HASHENTRIES + 1) {
707 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
708 net->ipv6.devconf_dflt,
709 NETLINK_CB(cb->skb).portid,
710 cb->nlh->nlmsg_seq,
711 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 712 NETCONFA_ALL) < 0)
7a674200
ND		 713 goto done;
714 else
715 h++;
716 }
717done:
718 cb->args[0] = h;
719 cb->args[1] = idx;
720
721 return skb->len;
722}
723
1da177e4
LT		 724#ifdef CONFIG_SYSCTL
725static void dev_forward_change(struct inet6_dev *idev)
726{
727 struct net_device *dev;
728 struct inet6_ifaddr *ifa;
1da177e4
LT		 729
730 if (!idev)
731 return;
732 dev = idev->dev;
0187bdfb
BH		 733 if (idev->cnf.forwarding)
734 dev_disable_lro(dev);
1a940835 735 if (dev->flags & IFF_MULTICAST) {
2c5e8933 736 if (idev->cnf.forwarding) {
f3ee4010 737 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 738 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
739 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
740 } else {
f3ee4010 741 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 742 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
743 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
744 }
1da177e4 745 }
502a2ffd 746
747 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 748 if (ifa->flags&IFA_F_TENTATIVE)
749 continue;
1da177e4
LT		 750 if (idev->cnf.forwarding)
751 addrconf_join_anycast(ifa);
752 else
753 addrconf_leave_anycast(ifa);
754 }
f3a1bfb1
ND		 755 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
756 dev->ifindex, &idev->cnf);
1da177e4
LT		 757}
758
759
e186932b 760static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 761{
762 struct net_device *dev;
763 struct inet6_dev *idev;
764
4acd4945 765 for_each_netdev(net, dev) {
1da177e4
LT		 766 idev = __in6_dev_get(dev);
767 if (idev) {
e186932b
PE		 768 int changed = (!idev->cnf.forwarding) ^ (!newf);
769 idev->cnf.forwarding = newf;
1da177e4
LT		 770 if (changed)
771 dev_forward_change(idev);
772 }
1da177e4 773 }
1da177e4 774}
c8fecf22 775
013d97e9 776static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 777{
bff16c2f 778 struct net *net;
013d97e9
FR		 779 int old;
780
781 if (!rtnl_trylock())
782 return restart_syscall();
bff16c2f
PE		 783
784 net = (struct net *)table->extra2;
013d97e9
FR		 785 old = *p;
786 *p = newf;
b325fddb 787
013d97e9 788 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 789 if ((!newf) ^ (!old))
790 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
791 NETCONFA_IFINDEX_DEFAULT,
792 net->ipv6.devconf_dflt);
013d97e9
FR		 793 rtnl_unlock();
794 return 0;
88af182e 795 }
c8fecf22 796
e186932b 797 if (p == &net->ipv6.devconf_all->forwarding) {
d26c638c
ND		 798 int old_dflt = net->ipv6.devconf_dflt->forwarding;
799
e186932b 800 net->ipv6.devconf_dflt->forwarding = newf;
d26c638c
ND		 801 if ((!newf) ^ (!old_dflt))
802 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
803 NETCONFA_IFINDEX_DEFAULT,
804 net->ipv6.devconf_dflt);
805
e186932b 806 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 807 if ((!newf) ^ (!old))
808 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
809 NETCONFA_IFINDEX_ALL,
810 net->ipv6.devconf_all);
013d97e9 811 } else if ((!newf) ^ (!old))
c8fecf22 812 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 813 rtnl_unlock();
c8fecf22 814
013d97e9 815 if (newf)
7b4da532 816 rt6_purge_dflt_routers(net);
b325fddb 817 return 1;
c8fecf22 818}
35103d11
AG		 819
820static void addrconf_linkdown_change(struct net *net, __s32 newf)
821{
822 struct net_device *dev;
823 struct inet6_dev *idev;
824
825 for_each_netdev(net, dev) {
826 idev = __in6_dev_get(dev);
827 if (idev) {
828 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
829
830 idev->cnf.ignore_routes_with_linkdown = newf;
831 if (changed)
832 inet6_netconf_notify_devconf(dev_net(dev),
833 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
834 dev->ifindex,
835 &idev->cnf);
836 }
837 }
838}
839
840static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
841{
842 struct net *net;
843 int old;
844
845 if (!rtnl_trylock())
846 return restart_syscall();
847
848 net = (struct net *)table->extra2;
849 old = *p;
850 *p = newf;
851
852 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
853 if ((!newf) ^ (!old))
854 inet6_netconf_notify_devconf(net,
855 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
856 NETCONFA_IFINDEX_DEFAULT,
857 net->ipv6.devconf_dflt);
858 rtnl_unlock();
859 return 0;
860 }
861
862 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
863 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
864 addrconf_linkdown_change(net, newf);
865 if ((!newf) ^ (!old))
866 inet6_netconf_notify_devconf(net,
867 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
868 NETCONFA_IFINDEX_ALL,
869 net->ipv6.devconf_all);
870 }
871 rtnl_unlock();
872
873 return 1;
874}
875
1da177e4
LT		 876#endif
877
5c578aed 878/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 879void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
880{
c2e21293 881 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 882
1da177e4 883#ifdef NET_REFCNT_DEBUG
91df42be 884 pr_debug("%s\n", __func__);
1da177e4
LT		 885#endif
886
887 in6_dev_put(ifp->idev);
888
c15b1cca
HFS		 889 if (cancel_delayed_work(&ifp->dad_work))
890 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
891 ifp);
1da177e4 892
e9d3e084 893 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 894 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 895 return;
896 }
94e187c0 897 ip6_rt_put(ifp->rt);
1da177e4 898
e5785985 899 kfree_rcu(ifp, rcu);
1da177e4
LT		 900}
901
e55ffac6
BH		 902static void
903ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
904{
502a2ffd 905 struct list_head *p;
8a6ce0c0 906 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 907
908 /*
909 * Each device address list is sorted in order of scope -
910 * global before linklocal.
911 */
502a2ffd 912 list_for_each(p, &idev->addr_list) {
913 struct inet6_ifaddr *ifa
914 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 915 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 916 break;
917 }
918
b54c9b98 919 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 920}
921
ddbe5032 922static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 923{
ddbe5032 924 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 925}
926
1da177e4
LT		 927/* On success it returns ifp with increased reference count */
928
929static struct inet6_ifaddr *
3f8f5298
JP		 930ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
931 const struct in6_addr *peer_addr, int pfxlen,
8a226b2c 932 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
1da177e4
LT		 933{
934 struct inet6_ifaddr *ifa = NULL;
935 struct rt6_info *rt;
3a88a81d 936 unsigned int hash;
1da177e4 937 int err = 0;
d68b8270
YH		 938 int addr_type = ipv6_addr_type(addr);
939
940 if (addr_type == IPV6_ADDR_ANY ||
941 addr_type & IPV6_ADDR_MULTICAST ||
942 (!(idev->dev->flags & IFF_LOOPBACK) &&
943 addr_type & IPV6_ADDR_LOOPBACK))
944 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 945
8814c4b5 946 rcu_read_lock_bh();
1da177e4
LT		 947 if (idev->dead) {
948 err = -ENODEV; /*XXX*/
949 goto out2;
950 }
951
56d417b1 952 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 953 err = -EACCES;
954 goto out2;
955 }
956
5c578aed 957 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 958
959 /* Ignore adding duplicate addresses on an interface */
c346dca1 960 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ba3542e1 961 ADBG("ipv6_add_addr: already assigned\n");
1da177e4
LT		 962 err = -EEXIST;
963 goto out;
964 }
965
322f74a4 966 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4 967
63159f29 968 if (!ifa) {
ba3542e1 969 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 970 err = -ENOBUFS;
971 goto out;
972 }
973
8f031519 974 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 975 if (IS_ERR(rt)) {
976 err = PTR_ERR(rt);
977 goto out;
978 }
979
bba24896
JP		 980 neigh_parms_data_state_setall(idev->nd_parms);
981
4e3fd7a0 982 ifa->addr = *addr;
3f8f5298
JP		 983 if (peer_addr)
984 ifa->peer_addr = *peer_addr;
1da177e4
LT		 985
986 spin_lock_init(&ifa->lock);
c15b1cca 987 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 988 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 989 ifa->scope = scope;
990 ifa->prefix_len = pfxlen;
991 ifa->flags = flags | IFA_F_TENTATIVE;
8a226b2c
JB		 992 ifa->valid_lft = valid_lft;
993 ifa->prefered_lft = prefered_lft;
1da177e4 994 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 995 ifa->tokenized = false;
1da177e4 996
57f5f544
KF		 997 ifa->rt = rt;
998
1da177e4
LT		 999 ifa->idev = idev;
1000 in6_dev_hold(idev);
1001 /* For caller */
1002 in6_ifa_hold(ifa);
1003
1004 /* Add to big hash table */
ddbe5032 1005 hash = inet6_addr_hash(addr);
1da177e4 1006
5c578aed 1007 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 1008 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 1009
1010 write_lock(&idev->lock);
1011 /* Add to inet6_dev unicast addr list. */
e55ffac6 1012 ipv6_link_dev_addr(idev, ifa);
1da177e4 1013
1da177e4 1014 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 1015 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 1016 in6_ifa_hold(ifa);
1017 }
1da177e4 1018
1da177e4
LT		 1019 in6_ifa_hold(ifa);
1020 write_unlock(&idev->lock);
1021out2:
8814c4b5 1022 rcu_read_unlock_bh();
1da177e4 1023
fd92833a 1024 if (likely(err == 0))
f88c91dd 1025 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 1026 else {
1027 kfree(ifa);
1028 ifa = ERR_PTR(err);
1029 }
1030
1031 return ifa;
1032out:
5c578aed 1033 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 1034 goto out2;
1035}
1036
5b84efec
TH		 1037enum cleanup_prefix_rt_t {
1038 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1039 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1040 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1041};
1042
1043/*
1044 * Check, whether the prefix for ifp would still need a prefix route
1045 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1046 * constants.
1047 *
1048 * 1) we don't purge prefix if address was not permanent.
1049 * prefix is managed by its own lifetime.
1050 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1051 * 3) if there are no addresses, delete prefix.
1052 * 4) if there are still other permanent address(es),
1053 * corresponding prefix is still permanent.
1054 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1055 * don't purge the prefix, assume user space is managing it.
1056 * 6) otherwise, update prefix lifetime to the
1057 * longest valid lifetime among the corresponding
1058 * addresses on the device.
1059 * Note: subsequent RA will update lifetime.
1060 **/
1061static enum cleanup_prefix_rt_t
1062check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1063{
1064 struct inet6_ifaddr *ifa;
1065 struct inet6_dev *idev = ifp->idev;
1066 unsigned long lifetime;
1067 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1068
1069 *expires = jiffies;
1070
1071 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1072 if (ifa == ifp)
1073 continue;
1074 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1075 ifp->prefix_len))
1076 continue;
1077 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1078 return CLEANUP_PREFIX_RT_NOP;
1079
1080 action = CLEANUP_PREFIX_RT_EXPIRE;
1081
1082 spin_lock(&ifa->lock);
1083
1084 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1085 /*
1086 * Note: Because this address is
1087 * not permanent, lifetime <
1088 * LONG_MAX / HZ here.
1089 */
1090 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1091 *expires = ifa->tstamp + lifetime * HZ;
1092 spin_unlock(&ifa->lock);
1093 }
1094
1095 return action;
1096}
1097
1098static void
1099cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1100{
1101 struct rt6_info *rt;
1102
1103 rt = addrconf_get_prefix_route(&ifp->addr,
1104 ifp->prefix_len,
1105 ifp->idev->dev,
1106 0, RTF_GATEWAY | RTF_DEFAULT);
1107 if (rt) {
1108 if (del_rt)
1109 ip6_del_rt(rt);
1110 else {
1111 if (!(rt->rt6i_flags & RTF_EXPIRES))
1112 rt6_set_expires(rt, expires);
1113 ip6_rt_put(rt);
1114 }
1115 }
1116}
1117
1118
1da177e4
LT		 1119/* This function wants to get referenced ifp and releases it before return */
1120
1121static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1122{
4c5ff6a6 1123 int state;
5b84efec
TH		 1124 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1125 unsigned long expires;
1da177e4 1126
c15b1cca
HFS		 1127 ASSERT_RTNL();
1128
8e8e676d 1129 spin_lock_bh(&ifp->lock);
4c5ff6a6 1130 state = ifp->state;
e9d3e084 1131 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1132 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1133
1134 if (state == INET6_IFADDR_STATE_DEAD)
1135 goto out;
1da177e4 1136
5c578aed 1137 spin_lock_bh(&addrconf_hash_lock);
1138 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1139 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1140
5b84efec 1141 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1142
1da177e4 1143 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1144 list_del(&ifp->tmp_list);
1145 if (ifp->ifpub) {
1146 in6_ifa_put(ifp->ifpub);
1147 ifp->ifpub = NULL;
1da177e4 1148 }
372e6c8f 1149 __in6_ifa_put(ifp);
1da177e4 1150 }
1da177e4 1151
5b84efec
TH		 1152 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1153 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1154
5b84efec
TH		 1155 list_del_init(&ifp->if_list);
1156 __in6_ifa_put(ifp);
1157
1158 write_unlock_bh(&ifp->idev->lock);
1da177e4 1159
c15b1cca 1160 addrconf_del_dad_work(ifp);
b2238566 1161
1da177e4
LT		 1162 ipv6_ifa_notify(RTM_DELADDR, ifp);
1163
f88c91dd 1164 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1165
5b84efec
TH		 1166 if (action != CLEANUP_PREFIX_RT_NOP) {
1167 cleanup_prefix_route(ifp, expires,
1168 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1169 }
1170
c3968a85
DW		 1171 /* clean up prefsrc entries */
1172 rt6_remove_prefsrc(ifp);
4c5ff6a6 1173out:
1da177e4
LT		 1174 in6_ifa_put(ifp);
1175}
1176
1da177e4
LT		 1177static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1178{
1179 struct inet6_dev *idev = ifp->idev;
1180 struct in6_addr addr, *tmpaddr;
76f793e3 1181 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1182 unsigned long regen_advance;
1da177e4
LT		 1183 int tmp_plen;
1184 int ret = 0;
95c385b4 1185 u32 addr_flags;
76f793e3 1186 unsigned long now = jiffies;
76506a98 1187 long max_desync_factor;
1da177e4 1188
53bd6749 1189 write_lock_bh(&idev->lock);
1da177e4
LT		 1190 if (ift) {
1191 spin_lock_bh(&ift->lock);
1192 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1193 spin_unlock_bh(&ift->lock);
1194 tmpaddr = &addr;
1195 } else {
1196 tmpaddr = NULL;
1197 }
1198retry:
1199 in6_dev_hold(idev);
1200 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1201 write_unlock_bh(&idev->lock);
f3213831 1202 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1203 in6_dev_put(idev);
1204 ret = -1;
1205 goto out;
1206 }
1207 spin_lock_bh(&ifp->lock);
1208 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1209 idev->cnf.use_tempaddr = -1; /*XXX*/
1210 spin_unlock_bh(&ifp->lock);
53bd6749 1211 write_unlock_bh(&idev->lock);
f3213831
JP		 1212 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1213 __func__);
1da177e4
LT		 1214 in6_dev_put(idev);
1215 ret = -1;
1216 goto out;
1217 }
1218 in6_ifa_hold(ifp);
1219 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
9d6280da 1220 ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1221 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1222 age = (now - ifp->tstamp) / HZ;
76506a98
JB		 1223
1224 regen_advance = idev->cnf.regen_max_retry *
1225 idev->cnf.dad_transmits *
1226 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1227
1228 /* recalculate max_desync_factor each time and update
1229 * idev->desync_factor if it's larger
1230 */
1231 max_desync_factor = min_t(__u32,
1232 idev->cnf.max_desync_factor,
1233 idev->cnf.temp_prefered_lft - regen_advance);
1234
1235 if (unlikely(idev->desync_factor > max_desync_factor)) {
1236 if (max_desync_factor > 0) {
1237 get_random_bytes(&idev->desync_factor,
1238 sizeof(idev->desync_factor));
1239 idev->desync_factor %= max_desync_factor;
1240 } else {
1241 idev->desync_factor = 0;
1242 }
1243 }
1244
1da177e4
LT		 1245 tmp_valid_lft = min_t(__u32,
1246 ifp->valid_lft,
7a876b0e 1247 idev->cnf.temp_valid_lft + age);
76506a98
JB		 1248 tmp_prefered_lft = idev->cnf.temp_prefered_lft + age -
1249 idev->desync_factor;
1250 /* guard against underflow in case of concurrent updates to cnf */
1251 if (unlikely(tmp_prefered_lft < 0))
1252 tmp_prefered_lft = 0;
1253 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1da177e4 1254 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1255 tmp_tstamp = ifp->tstamp;
1256 spin_unlock_bh(&ifp->lock);
1257
53bd6749 1258 write_unlock_bh(&idev->lock);
95c385b4 1259
eac55bf9
BB		 1260 /* A temporary address is created only if this calculated Preferred
1261 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1262 * an implementation must not create a temporary address with a zero
1263 * Preferred Lifetime.
ecab6701
HK		 1264 * Use age calculation as in addrconf_verify to avoid unnecessary
1265 * temporary addresses being generated.
eac55bf9 1266 */
ecab6701
HK		 1267 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1268 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1269 in6_ifa_put(ifp);
1270 in6_dev_put(idev);
1271 ret = -1;
1272 goto out;
1273 }
1274
95c385b4
NH		 1275 addr_flags = IFA_F_TEMPORARY;
1276 /* set in addrconf_prefix_rcv() */
1277 if (ifp->flags & IFA_F_OPTIMISTIC)
1278 addr_flags |= IFA_F_OPTIMISTIC;
1279
4b08a8f1
HFS		 1280 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1281 ipv6_addr_scope(&addr), addr_flags,
1282 tmp_valid_lft, tmp_prefered_lft);
1283 if (IS_ERR(ift)) {
1da177e4
LT		 1284 in6_ifa_put(ifp);
1285 in6_dev_put(idev);
f3213831 1286 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1287 tmpaddr = &addr;
53bd6749 1288 write_lock_bh(&idev->lock);
1da177e4
LT		 1289 goto retry;
1290 }
1291
1292 spin_lock_bh(&ift->lock);
1293 ift->ifpub = ifp;
76f793e3 1294 ift->cstamp = now;
1da177e4
LT		 1295 ift->tstamp = tmp_tstamp;
1296 spin_unlock_bh(&ift->lock);
1297
cf22f9a2 1298 addrconf_dad_start(ift);
1da177e4
LT		 1299 in6_ifa_put(ift);
1300 in6_dev_put(idev);
1301out:
1302 return ret;
1303}
1da177e4
LT		 1304
1305/*
072047e4 1306 * Choose an appropriate source address (RFC3484)
1da177e4 1307 */
a9b05723
YH		 1308enum {
1309 IPV6_SADDR_RULE_INIT = 0,
1310 IPV6_SADDR_RULE_LOCAL,
1311 IPV6_SADDR_RULE_SCOPE,
1312 IPV6_SADDR_RULE_PREFERRED,
1313#ifdef CONFIG_IPV6_MIP6
1314 IPV6_SADDR_RULE_HOA,
1315#endif
1316 IPV6_SADDR_RULE_OIF,
1317 IPV6_SADDR_RULE_LABEL,
a9b05723 1318 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1319 IPV6_SADDR_RULE_ORCHID,
1320 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1321#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1322 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1323#endif
a9b05723
YH		 1324 IPV6_SADDR_RULE_MAX
1325};
1326
072047e4 1327struct ipv6_saddr_score {
a9b05723
YH		 1328 int rule;
1329 int addr_type;
1330 struct inet6_ifaddr *ifa;
1331 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1332 int scopedist;
1333 int matchlen;
072047e4
YH		 1334};
1335
a9b05723 1336struct ipv6_saddr_dst {
9acd9f3a 1337 const struct in6_addr *addr;
a9b05723
YH		 1338 int ifindex;
1339 int scope;
1340 int label;
7cbca67c 1341 unsigned int prefs;
a9b05723 1342};
072047e4 1343
b6f99a21 1344static inline int ipv6_saddr_preferred(int type)
1da177e4 1345{
45bb0060 1346 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1347 return 1;
1348 return 0;
1da177e4
LT		 1349}
1350
7fd2561e
EK		 1351static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1352{
1353#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1354 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1355#else
1356 return false;
1357#endif
1358}
1359
3de23255
BT		 1360static int ipv6_get_saddr_eval(struct net *net,
1361 struct ipv6_saddr_score *score,
a9b05723
YH		 1362 struct ipv6_saddr_dst *dst,
1363 int i)
1364{
1365 int ret;
1366
1367 if (i <= score->rule) {
1368 switch (i) {
1369 case IPV6_SADDR_RULE_SCOPE:
1370 ret = score->scopedist;
1371 break;
1372 case IPV6_SADDR_RULE_PREFIX:
1373 ret = score->matchlen;
1374 break;
1375 default:
1376 ret = !!test_bit(i, score->scorebits);
1377 }
1378 goto out;
1379 }
1380
1381 switch (i) {
1382 case IPV6_SADDR_RULE_INIT:
1383 /* Rule 0: remember if hiscore is not ready yet */
1384 ret = !!score->ifa;
1385 break;
1386 case IPV6_SADDR_RULE_LOCAL:
1387 /* Rule 1: Prefer same address */
1388 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1389 break;
1390 case IPV6_SADDR_RULE_SCOPE:
1391 /* Rule 2: Prefer appropriate scope
1392 *
1393 * ret
1394 * ^
1395 * -1 | d 15
1396 * ---+--+-+---> scope
1397 * |
1398 * | d is scope of the destination.
1399 * B-d | \
1400 * | \ <- smaller scope is better if
db9c7c39 1401 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1402 * | ret = B - scope (-1 <= scope >= d <= 15).
1403 * d-C-1 | /
1404 * |/ <- greater is better
1405 * -C / if scope is not enough for destination.
1406 * /| ret = scope - C (-1 <= d < scope <= 15).
1407 *
1408 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1409 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1410 * Assume B = 0 and we get C > 29.
1411 */
1412 ret = __ipv6_addr_src_scope(score->addr_type);
1413 if (ret >= dst->scope)
1414 ret = -ret;
1415 else
1416 ret -= 128; /* 30 is enough */
1417 score->scopedist = ret;
1418 break;
1419 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1420 {
a9b05723 1421 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1422 u8 avoid = IFA_F_DEPRECATED;
1423
1424 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1425 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1426 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1427 !(score->ifa->flags & avoid);
a9b05723 1428 break;
7fd2561e 1429 }
a9b05723
YH		 1430#ifdef CONFIG_IPV6_MIP6
1431 case IPV6_SADDR_RULE_HOA:
7cbca67c 1432 {
a9b05723 1433 /* Rule 4: Prefer home address */
7cbca67c
YH		 1434 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1435 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1436 break;
7cbca67c 1437 }
a9b05723
YH		 1438#endif
1439 case IPV6_SADDR_RULE_OIF:
1440 /* Rule 5: Prefer outgoing interface */
1441 ret = (!dst->ifindex ||
1442 dst->ifindex == score->ifa->idev->dev->ifindex);
1443 break;
1444 case IPV6_SADDR_RULE_LABEL:
1445 /* Rule 6: Prefer matching label */
3de23255
BT		 1446 ret = ipv6_addr_label(net,
1447 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1448 score->ifa->idev->dev->ifindex) == dst->label;
1449 break;
a9b05723 1450 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1451 {
a9b05723 1452 /* Rule 7: Prefer public address
25985edc 1453 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1454 */
7cbca67c
YH		 1455 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1456 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1457 score->ifa->idev->cnf.use_tempaddr >= 2;
1458 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1459 break;
7cbca67c 1460 }
a9b05723
YH		 1461 case IPV6_SADDR_RULE_ORCHID:
1462 /* Rule 8-: Prefer ORCHID vs ORCHID or
1463 * non-ORCHID vs non-ORCHID
1464 */
1465 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1466 ipv6_addr_orchid(dst->addr));
1467 break;
1468 case IPV6_SADDR_RULE_PREFIX:
1469 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1470 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1471 if (ret > score->ifa->prefix_len)
1472 ret = score->ifa->prefix_len;
1473 score->matchlen = ret;
a9b05723 1474 break;
7fd2561e
EK		 1475#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1476 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1477 /* Optimistic addresses still have lower precedence than other
1478 * preferred addresses.
1479 */
1480 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1481 break;
1482#endif
a9b05723
YH		 1483 default:
1484 ret = 0;
1485 }
1486
1487 if (ret)
1488 __set_bit(i, score->scorebits);
1489 score->rule = i;
1490out:
1491 return ret;
1492}
1493
c0b8da1e
YH		 1494static int __ipv6_dev_get_saddr(struct net *net,
1495 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1496 struct inet6_dev *idev,
1497 struct ipv6_saddr_score *scores,
1498 int hiscore_idx)
9131f3de 1499{
c0b8da1e 1500 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de
YH		 1501
1502 read_lock_bh(&idev->lock);
1503 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1504 int i;
1505
1506 /*
1507 * - Tentative Address (RFC2462 section 5.4)
1508 * - A tentative address is not considered
1509 * "assigned to an interface" in the traditional
1510 * sense, unless it is also flagged as optimistic.
1511 * - Candidate Source Address (section 4)
1512 * - In any case, anycast addresses, multicast
1513 * addresses, and the unspecified address MUST
1514 * NOT be included in a candidate set.
1515 */
1516 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1517 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1518 continue;
1519
1520 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1521
1522 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1523 score->addr_type & IPV6_ADDR_MULTICAST)) {
1524 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1525 idev->dev->name);
1526 continue;
1527 }
1528
1529 score->rule = -1;
1530 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1531
1532 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1533 int minihiscore, miniscore;
1534
1535 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1536 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1537
1538 if (minihiscore > miniscore) {
1539 if (i == IPV6_SADDR_RULE_SCOPE &&
1540 score->scopedist > 0) {
1541 /*
1542 * special case:
1543 * each remaining entry
1544 * has too small (not enough)
1545 * scope, because ifa entries
1546 * are sorted by their scope
1547 * values.
1548 */
1549 goto out;
1550 }
1551 break;
1552 } else if (minihiscore < miniscore) {
1553 if (hiscore->ifa)
1554 in6_ifa_put(hiscore->ifa);
1555
1556 in6_ifa_hold(score->ifa);
1557
1558 swap(hiscore, score);
c0b8da1e 1559 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1560
1561 /* restore our iterator */
1562 score->ifa = hiscore->ifa;
1563
1564 break;
1565 }
1566 }
1567 }
1568out:
1569 read_unlock_bh(&idev->lock);
c0b8da1e 1570 return hiscore_idx;
9131f3de
YH		 1571}
1572
afbac601
DA		 1573static int ipv6_get_saddr_master(struct net *net,
1574 const struct net_device *dst_dev,
1575 const struct net_device *master,
1576 struct ipv6_saddr_dst *dst,
1577 struct ipv6_saddr_score *scores,
1578 int hiscore_idx)
1579{
1580 struct inet6_dev *idev;
1581
1582 idev = __in6_dev_get(dst_dev);
1583 if (idev)
1584 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1585 scores, hiscore_idx);
1586
1587 idev = __in6_dev_get(master);
1588 if (idev)
1589 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1590 scores, hiscore_idx);
1591
1592 return hiscore_idx;
1593}
1594
b3f644fc 1595int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1596 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1597 struct in6_addr *saddr)
1da177e4 1598{
c0b8da1e 1599 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1600 struct ipv6_saddr_dst dst;
9131f3de 1601 struct inet6_dev *idev;
072047e4 1602 struct net_device *dev;
a9b05723 1603 int dst_type;
9131f3de 1604 bool use_oif_addr = false;
c0b8da1e 1605 int hiscore_idx = 0;
1da177e4 1606
a9b05723
YH		 1607 dst_type = __ipv6_addr_type(daddr);
1608 dst.addr = daddr;
1609 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1610 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1611 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1612 dst.prefs = prefs;
a9b05723 1613
c0b8da1e
YH		 1614 scores[hiscore_idx].rule = -1;
1615 scores[hiscore_idx].ifa = NULL;
1da177e4 1616
8814c4b5 1617 rcu_read_lock();
1da177e4 1618
9131f3de
YH		 1619 /* Candidate Source Address (section 4)
1620 * - multicast and link-local destination address,
1621 * the set of candidate source address MUST only
1622 * include addresses assigned to interfaces
1623 * belonging to the same link as the outgoing
1624 * interface.
1625 * (- For site-local destination addresses, the
1626 * set of candidate source addresses MUST only
1627 * include addresses assigned to interfaces
1628 * belonging to the same site as the outgoing
1629 * interface.)
3985e8a3
EK		 1630 * - "It is RECOMMENDED that the candidate source addresses
1631 * be the set of unicast addresses assigned to the
1632 * interface that will be used to send to the destination
1633 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1634 */
1635 if (dst_dev) {
3985e8a3 1636 idev = __in6_dev_get(dst_dev);
9131f3de 1637 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1638 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1639 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1640 use_oif_addr = true;
1641 }
1642 }
a9b05723 1643
9131f3de 1644 if (use_oif_addr) {
c0b8da1e 1645 if (idev)
c15df306 1646 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de 1647 } else {
afbac601
DA		 1648 const struct net_device *master;
1649 int master_idx = 0;
1650
1651 /* if dst_dev exists and is enslaved to an L3 device, then
1652 * prefer addresses from dst_dev and then the master over
1653 * any other enslaved devices in the L3 domain.
1654 */
1655 master = l3mdev_master_dev_rcu(dst_dev);
1656 if (master) {
1657 master_idx = master->ifindex;
1658
1659 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1660 master, &dst,
1661 scores, hiscore_idx);
1662
1663 if (scores[hiscore_idx].ifa)
1664 goto out;
1665 }
1666
9131f3de 1667 for_each_netdev_rcu(net, dev) {
afbac601
DA		 1668 /* only consider addresses on devices in the
1669 * same L3 domain
1670 */
1671 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1672 continue;
9131f3de
YH		 1673 idev = __in6_dev_get(dev);
1674 if (!idev)
072047e4 1675 continue;
c15df306 1676 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1677 }
1678 }
afbac601
DA		 1679
1680out:
8814c4b5 1681 rcu_read_unlock();
1da177e4 1682
c0b8da1e 1683 hiscore = &scores[hiscore_idx];
a9b05723 1684 if (!hiscore->ifa)
072047e4 1685 return -EADDRNOTAVAIL;
1ab1457c 1686
4e3fd7a0 1687 *saddr = hiscore->ifa->addr;
a9b05723 1688 in6_ifa_put(hiscore->ifa);
072047e4 1689 return 0;
1da177e4 1690}
5e5f3f0f 1691EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1692
8965779d 1693int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1694 u32 banned_flags)
b7b1bfce
HFS		 1695{
1696 struct inet6_ifaddr *ifp;
1697 int err = -EADDRNOTAVAIL;
1698
602582ca
HFS		 1699 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1700 if (ifp->scope > IFA_LINK)
1701 break;
b7b1bfce
HFS		 1702 if (ifp->scope == IFA_LINK &&
1703 !(ifp->flags & banned_flags)) {
1704 *addr = ifp->addr;
1705 err = 0;
1706 break;
1707 }
1708 }
1709 return err;
1710}
1711
95c385b4 1712int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1713 u32 banned_flags)
1da177e4
LT		 1714{
1715 struct inet6_dev *idev;
1716 int err = -EADDRNOTAVAIL;
1717
8814c4b5 1718 rcu_read_lock();
e21e8467
SH		 1719 idev = __in6_dev_get(dev);
1720 if (idev) {
1da177e4 1721 read_lock_bh(&idev->lock);
b7b1bfce 1722 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1723 read_unlock_bh(&idev->lock);
1724 }
8814c4b5 1725 rcu_read_unlock();
1da177e4
LT		 1726 return err;
1727}
1728
1729static int ipv6_count_addresses(struct inet6_dev *idev)
1730{
1731 int cnt = 0;
1732 struct inet6_ifaddr *ifp;
1733
1734 read_lock_bh(&idev->lock);
502a2ffd 1735 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1736 cnt++;
1737 read_unlock_bh(&idev->lock);
1738 return cnt;
1739}
1740
b71d1d42 1741int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1742 const struct net_device *dev, int strict)
c58da4c6
EK		 1743{
1744 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1745}
1746EXPORT_SYMBOL(ipv6_chk_addr);
1747
1748int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1749 const struct net_device *dev, int strict,
1750 u32 banned_flags)
1da177e4 1751{
eedf042a 1752 struct inet6_ifaddr *ifp;
ddbe5032 1753 unsigned int hash = inet6_addr_hash(addr);
c58da4c6 1754 u32 ifp_flags;
1da177e4 1755
5c578aed 1756 rcu_read_lock_bh();
b67bfe0d 1757 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1758 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1759 continue;
c58da4c6
EK		 1760 /* Decouple optimistic from tentative for evaluation here.
1761 * Ban optimistic addresses explicitly, when required.
1762 */
1763 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1764 ? (ifp->flags&~IFA_F_TENTATIVE)
1765 : ifp->flags;
1da177e4 1766 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1767 !(ifp_flags&banned_flags) &&
63159f29 1768 (!dev || ifp->idev->dev == dev ||
eedf042a
SH		 1769 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1770 rcu_read_unlock_bh();
1771 return 1;
1da177e4
LT		 1772 }
1773 }
5c578aed 1774
eedf042a
SH		 1775 rcu_read_unlock_bh();
1776 return 0;
1da177e4 1777}
c58da4c6 1778EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1779
3e81c6da
DM		 1780static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1781 struct net_device *dev)
1da177e4 1782{
ddbe5032 1783 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1784 struct inet6_ifaddr *ifp;
1da177e4 1785
b67bfe0d 1786 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1787 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1788 continue;
1da177e4 1789 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1790 if (!dev || ifp->idev->dev == dev)
3e81c6da 1791 return true;
1da177e4
LT		 1792 }
1793 }
3e81c6da 1794 return false;
1da177e4
LT		 1795}
1796
7df37ff3
CB		 1797/* Compares an address/prefix_len with addresses on device @dev.
1798 * If one is found it returns true.
1799 */
1800bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1801 const unsigned int prefix_len, struct net_device *dev)
1802{
1803 struct inet6_dev *idev;
1804 struct inet6_ifaddr *ifa;
1805 bool ret = false;
1806
1807 rcu_read_lock();
1808 idev = __in6_dev_get(dev);
1809 if (idev) {
1810 read_lock_bh(&idev->lock);
1811 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1812 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1813 if (ret)
1814 break;
1815 }
1816 read_unlock_bh(&idev->lock);
1817 }
1818 rcu_read_unlock();
1819
1820 return ret;
1821}
1822EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1823
b71d1d42 1824int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1825{
1826 struct inet6_dev *idev;
1827 struct inet6_ifaddr *ifa;
1828 int onlink;
1829
1830 onlink = 0;
1831 rcu_read_lock();
1832 idev = __in6_dev_get(dev);
1833 if (idev) {
1834 read_lock_bh(&idev->lock);
502a2ffd 1835 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1836 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1837 ifa->prefix_len);
1838 if (onlink)
1839 break;
1840 }
1841 read_unlock_bh(&idev->lock);
1842 }
1843 rcu_read_unlock();
1844 return onlink;
1845}
52eeeb84
YH		 1846EXPORT_SYMBOL(ipv6_chk_prefix);
1847
9acd9f3a 1848struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1849 struct net_device *dev, int strict)
1da177e4 1850{
b79d1d54 1851 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1852 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1853
5c578aed 1854 rcu_read_lock_bh();
b67bfe0d 1855 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1856 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1857 continue;
1da177e4 1858 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1859 if (!dev || ifp->idev->dev == dev ||
1da177e4 1860 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1861 result = ifp;
1da177e4
LT		 1862 in6_ifa_hold(ifp);
1863 break;
1864 }
1865 }
1866 }
5c578aed 1867 rcu_read_unlock_bh();
1da177e4 1868
b79d1d54 1869 return result;
1da177e4
LT		 1870}
1871
1da177e4
LT		 1872/* Gets referenced address, destroys ifaddr */
1873
cc411d0b 1874static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1875{
3d171f39
LR		 1876 if (dad_failed)
1877 ifp->flags |= IFA_F_DADFAILED;
1878
1da177e4
LT		 1879 if (ifp->flags&IFA_F_PERMANENT) {
1880 spin_lock_bh(&ifp->lock);
c15b1cca 1881 addrconf_del_dad_work(ifp);
1da177e4
LT		 1882 ifp->flags |= IFA_F_TENTATIVE;
1883 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1884 if (dad_failed)
1885 ipv6_ifa_notify(0, ifp);
1da177e4 1886 in6_ifa_put(ifp);
1da177e4
LT		 1887 } else if (ifp->flags&IFA_F_TEMPORARY) {
1888 struct inet6_ifaddr *ifpub;
1889 spin_lock_bh(&ifp->lock);
1890 ifpub = ifp->ifpub;
1891 if (ifpub) {
1892 in6_ifa_hold(ifpub);
1893 spin_unlock_bh(&ifp->lock);
1894 ipv6_create_tempaddr(ifpub, ifp);
1895 in6_ifa_put(ifpub);
1896 } else {
1897 spin_unlock_bh(&ifp->lock);
1898 }
1899 ipv6_del_addr(ifp);
c15b1cca 1900 } else {
1da177e4 1901 ipv6_del_addr(ifp);
c15b1cca 1902 }
1da177e4
LT		 1903}
1904
f2344a13
HX		 1905static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1906{
1907 int err = -ENOENT;
1908
8e8e676d 1909 spin_lock_bh(&ifp->lock);
f2344a13
HX		 1910 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1911 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1912 err = 0;
1913 }
8e8e676d 1914 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 1915
1916 return err;
1917}
1918
3c21edbd
YH		 1919void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1920{
1b34be74 1921 struct inet6_dev *idev = ifp->idev;
1855b7c3 1922 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 1923
853dc2e0
UB		 1924 if (addrconf_dad_end(ifp)) {
1925 in6_ifa_put(ifp);
f2344a13 1926 return;
853dc2e0 1927 }
f2344a13 1928
e87cc472
JP		 1929 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1930 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1931
5f40ef77
HFS		 1932 spin_lock_bh(&ifp->lock);
1933
1934 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1935 int scope = ifp->scope;
1936 u32 flags = ifp->flags;
1937 struct in6_addr new_addr;
1938 struct inet6_ifaddr *ifp2;
1939 u32 valid_lft, preferred_lft;
1940 int pfxlen = ifp->prefix_len;
5f40ef77
HFS		 1941 int retries = ifp->stable_privacy_retry + 1;
1942
1855b7c3 1943 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 1944 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1945 ifp->idev->dev->name);
1946 goto errdad;
1947 }
1948
1949 new_addr = ifp->addr;
1950 if (ipv6_generate_stable_address(&new_addr, retries,
1951 idev))
1952 goto errdad;
1953
1954 valid_lft = ifp->valid_lft;
1955 preferred_lft = ifp->prefered_lft;
1956
1957 spin_unlock_bh(&ifp->lock);
1b34be74 1958
5f40ef77
HFS		 1959 if (idev->cnf.max_addresses &&
1960 ipv6_count_addresses(idev) >=
1961 idev->cnf.max_addresses)
1962 goto lock_errdad;
1963
1964 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1965 ifp->idev->dev->name);
1966
1967 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1968 scope, flags, valid_lft,
1969 preferred_lft);
1970 if (IS_ERR(ifp2))
1971 goto lock_errdad;
1972
1973 spin_lock_bh(&ifp2->lock);
1974 ifp2->stable_privacy_retry = retries;
1975 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1976 spin_unlock_bh(&ifp2->lock);
1977
1855b7c3 1978 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 1979 in6_ifa_put(ifp2);
1980lock_errdad:
1981 spin_lock_bh(&ifp->lock);
1b34be74
YH		 1982 }
1983
5f40ef77 1984errdad:
c15b1cca
HFS		 1985 /* transition from _POSTDAD to _ERRDAD */
1986 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 1987 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 1988
1989 addrconf_mod_dad_work(ifp, 0);
751eb6b6 1990 in6_ifa_put(ifp);
3c21edbd 1991}
1da177e4 1992
a9ed4a29
SD		 1993/* Join to solicited addr multicast group.
1994 * caller must hold RTNL */
b71d1d42 1995void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1996{
1997 struct in6_addr maddr;
1998
1999 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2000 return;
2001
2002 addrconf_addr_solict_mult(addr, &maddr);
2003 ipv6_dev_mc_inc(dev, &maddr);
2004}
2005
a9ed4a29 2006/* caller must hold RTNL */
b71d1d42 2007void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 2008{
2009 struct in6_addr maddr;
2010
2011 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2012 return;
2013
2014 addrconf_addr_solict_mult(addr, &maddr);
2015 __ipv6_dev_mc_dec(idev, &maddr);
2016}
2017
a9ed4a29 2018/* caller must hold RTNL */
20380731 2019static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2020{
2021 struct in6_addr addr;
c15b1cca 2022
88ad3149 2023 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 2024 return;
1da177e4
LT		 2025 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2026 if (ipv6_addr_any(&addr))
2027 return;
013b4d90 2028 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 2029}
2030
a9ed4a29 2031/* caller must hold RTNL */
20380731 2032static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2033{
2034 struct in6_addr addr;
c15b1cca 2035
88ad3149 2036 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 2037 return;
1da177e4
LT		 2038 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2039 if (ipv6_addr_any(&addr))
2040 return;
2041 __ipv6_dev_ac_dec(ifp->idev, &addr);
2042}
2043
06a4c1c5 2044static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
2045{
5241c2d7 2046 if (dev->addr_len != EUI64_ADDR_LEN)
06a4c1c5 2047 return -1;
5241c2d7 2048 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
5e98a36e 2049 eui[0] ^= 2;
06a4c1c5 2050 return 0;
2051}
2052
cb6bf355
YH		 2053static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2054{
2055 union fwnet_hwaddr *ha;
2056
2057 if (dev->addr_len != FWNET_ALEN)
2058 return -1;
2059
2060 ha = (union fwnet_hwaddr *)dev->dev_addr;
2061
2062 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2063 eui[0] ^= 2;
2064 return 0;
2065}
2066
073a8e0e
YH		 2067static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2068{
2069 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2070 if (dev->addr_len != ARCNET_ALEN)
2071 return -1;
2072 memset(eui, 0, 7);
8e5e8f30 2073 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 2074 return 0;
2075}
2076
2077static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2078{
2079 if (dev->addr_len != INFINIBAND_ALEN)
2080 return -1;
2081 memcpy(eui, dev->dev_addr + 12, 8);
2082 eui[0] |= 2;
2083 return 0;
2084}
2085
c61393ea 2086static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2087{
9af28511
SH		 2088 if (addr == 0)
2089 return -1;
dfd982ba
YH		 2090 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2091 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2092 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2093 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2094 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2095 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2096 eui[1] = 0;
2097 eui[2] = 0x5E;
2098 eui[3] = 0xFE;
2099 memcpy(eui + 4, &addr, 4);
2100 return 0;
2101}
dfd982ba
YH		 2102
2103static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2104{
2105 if (dev->priv_flags & IFF_ISATAP)
2106 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2107 return -1;
2108}
2109
aee80b54 2110static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2111{
2112 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2113}
2114
e837735e
ND		 2115static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2116{
2117 memcpy(eui, dev->perm_addr, 3);
2118 memcpy(eui + 5, dev->perm_addr + 3, 3);
2119 eui[3] = 0xFF;
2120 eui[4] = 0xFE;
2121 eui[0] ^= 2;
2122 return 0;
2123}
2124
1da177e4
LT		 2125static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2126{
2127 switch (dev->type) {
2128 case ARPHRD_ETHER:
2129 case ARPHRD_FDDI:
073a8e0e 2130 return addrconf_ifid_eui48(eui, dev);
1da177e4 2131 case ARPHRD_ARCNET:
073a8e0e 2132 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2133 case ARPHRD_INFINIBAND:
073a8e0e 2134 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2135 case ARPHRD_SIT:
dfd982ba 2136 return addrconf_ifid_sit(eui, dev);
aee80b54 2137 case ARPHRD_IPGRE:
2138 return addrconf_ifid_gre(eui, dev);
e74bccb8 2139 case ARPHRD_6LOWPAN:
06a4c1c5 2140 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 2141 case ARPHRD_IEEE1394:
2142 return addrconf_ifid_ieee1394(eui, dev);
e837735e
ND		 2143 case ARPHRD_TUNNEL6:
2144 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2145 }
2146 return -1;
2147}
2148
2149static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2150{
2151 int err = -1;
2152 struct inet6_ifaddr *ifp;
2153
2154 read_lock_bh(&idev->lock);
602582ca
HFS		 2155 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2156 if (ifp->scope > IFA_LINK)
2157 break;
1da177e4
LT		 2158 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2159 memcpy(eui, ifp->addr.s6_addr+8, 8);
2160 err = 0;
2161 break;
2162 }
2163 }
2164 read_unlock_bh(&idev->lock);
2165 return err;
2166}
2167
1da177e4 2168/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
9d6280da 2169static void ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2170{
1da177e4 2171regen:
955189ef 2172 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2173 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2174
2175 /*
2176 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2177 * check if generated address is not inappropriate
2178 *
2179 * - Reserved subnet anycast (RFC 2526)
2180 * 11111101 11....11 1xxxxxxx
c7dc89c0 2181 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2182 * 00-00-5E-FE-xx-xx-xx-xx
2183 * - value 0
2184 * - XXX: already assigned to an address on the device
2185 */
1ab1457c 2186 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2187 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2188 (idev->rndid[7]&0x80))
2189 goto regen;
2190 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2191 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2192 goto regen;
2193 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2194 goto regen;
2195 }
1da177e4
LT		 2196}
2197
9d6280da 2198static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2199{
1da177e4 2200 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
9d6280da 2201 ipv6_regen_rndid(idev);
1da177e4 2202}
1da177e4
LT		 2203
2204/*
2205 * Add prefix route.
2206 */
2207
2208static void
2209addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2210 unsigned long expires, u32 flags)
1da177e4 2211{
86872cb5 2212 struct fib6_config cfg = {
ca254490 2213 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
86872cb5
TG		 2214 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2215 .fc_ifindex = dev->ifindex,
2216 .fc_expires = expires,
2217 .fc_dst_len = plen,
2218 .fc_flags = RTF_UP | flags,
c346dca1 2219 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2220 .fc_protocol = RTPROT_KERNEL,
86872cb5 2221 };
1da177e4 2222
4e3fd7a0 2223 cfg.fc_dst = *pfx;
1da177e4
LT		 2224
2225 /* Prevent useless cloning on PtP SIT.
2226 This thing is done here expecting that the whole
2227 class of non-broadcast devices need not cloning.
2228 */
07a93626 2229#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2230 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2231 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2232#endif
1da177e4 2233
86872cb5 2234 ip6_route_add(&cfg);
1da177e4
LT		 2235}
2236
14ef37b6
AH		 2237
2238static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2239 int plen,
2240 const struct net_device *dev,
2241 u32 flags, u32 noflags)
2242{
2243 struct fib6_node *fn;
2244 struct rt6_info *rt = NULL;
2245 struct fib6_table *table;
ca254490 2246 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2247
ca254490 2248 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2249 if (!table)
14ef37b6
AH		 2250 return NULL;
2251
5744dd9b 2252 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2253 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2254 if (!fn)
2255 goto out;
1f56a01f
MKL		 2256
2257 noflags |= RTF_CACHE;
14ef37b6 2258 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2259 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2260 continue;
2261 if ((rt->rt6i_flags & flags) != flags)
2262 continue;
85da53bf 2263 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2264 continue;
2265 dst_hold(&rt->dst);
2266 break;
2267 }
2268out:
5744dd9b 2269 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2270 return rt;
2271}
2272
2273
1da177e4
LT		 2274/* Create "default" multicast route to the interface */
2275
2276static void addrconf_add_mroute(struct net_device *dev)
2277{
86872cb5 2278 struct fib6_config cfg = {
ca254490 2279 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2280 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2281 .fc_ifindex = dev->ifindex,
2282 .fc_dst_len = 8,
2283 .fc_flags = RTF_UP,
c346dca1 2284 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2285 };
2286
2287 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2288
2289 ip6_route_add(&cfg);
1da177e4
LT		 2290}
2291
1da177e4
LT		 2292static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2293{
2294 struct inet6_dev *idev;
2295
2296 ASSERT_RTNL();
2297
e21e8467
SH		 2298 idev = ipv6_find_idev(dev);
2299 if (!idev)
64e724f6
BH		 2300 return ERR_PTR(-ENOBUFS);
2301
2302 if (idev->cnf.disable_ipv6)
2303 return ERR_PTR(-EACCES);
1da177e4
LT		 2304
2305 /* Add default multicast route */
ba46ee4c 2306 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
4af04aba 2307 addrconf_add_mroute(dev);
1da177e4 2308
1da177e4
LT		 2309 return idev;
2310}
2311
53bd6749
JP		 2312static void manage_tempaddrs(struct inet6_dev *idev,
2313 struct inet6_ifaddr *ifp,
2314 __u32 valid_lft, __u32 prefered_lft,
2315 bool create, unsigned long now)
2316{
2317 u32 flags;
2318 struct inet6_ifaddr *ift;
2319
2320 read_lock_bh(&idev->lock);
2321 /* update all temporary addresses in the list */
2322 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2323 int age, max_valid, max_prefered;
2324
2325 if (ifp != ift->ifpub)
2326 continue;
2327
2328 /* RFC 4941 section 3.3:
2329 * If a received option will extend the lifetime of a public
2330 * address, the lifetimes of temporary addresses should
2331 * be extended, subject to the overall constraint that no
2332 * temporary addresses should ever remain "valid" or "preferred"
2333 * for a time longer than (TEMP_VALID_LIFETIME) or
2334 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2335 */
2336 age = (now - ift->cstamp) / HZ;
2337 max_valid = idev->cnf.temp_valid_lft - age;
2338 if (max_valid < 0)
2339 max_valid = 0;
2340
2341 max_prefered = idev->cnf.temp_prefered_lft -
76506a98 2342 idev->desync_factor - age;
53bd6749
JP		 2343 if (max_prefered < 0)
2344 max_prefered = 0;
2345
2346 if (valid_lft > max_valid)
2347 valid_lft = max_valid;
2348
2349 if (prefered_lft > max_prefered)
2350 prefered_lft = max_prefered;
2351
2352 spin_lock(&ift->lock);
2353 flags = ift->flags;
2354 ift->valid_lft = valid_lft;
2355 ift->prefered_lft = prefered_lft;
2356 ift->tstamp = now;
2357 if (prefered_lft > 0)
2358 ift->flags &= ~IFA_F_DEPRECATED;
2359
2360 spin_unlock(&ift->lock);
2361 if (!(flags&IFA_F_TENTATIVE))
2362 ipv6_ifa_notify(0, ift);
2363 }
2364
2365 if ((create || list_empty(&idev->tempaddr_list)) &&
2366 idev->cnf.use_tempaddr > 0) {
2367 /* When a new public address is created as described
2368 * in [ADDRCONF], also create a new temporary address.
2369 * Also create a temporary address if it's enabled but
2370 * no temporary address currently exists.
2371 */
2372 read_unlock_bh(&idev->lock);
2373 ipv6_create_tempaddr(ifp, NULL);
2374 } else {
2375 read_unlock_bh(&idev->lock);
2376 }
2377}
2378
cc9da6cc
BM		 2379static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2380{
2381 return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2382 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2383}
2384
cc84b3c6
AA		 2385int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2386 const struct prefix_info *pinfo,
2387 struct inet6_dev *in6_dev,
2388 const struct in6_addr *addr, int addr_type,
2389 u32 addr_flags, bool sllao, bool tokenized,
2390 __u32 valid_lft, u32 prefered_lft)
4f672235
AA		 2391{
2392 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2393 int create = 0, update_lft = 0;
2394
2395 if (!ifp && valid_lft) {
2396 int max_addresses = in6_dev->cnf.max_addresses;
2397
2398#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2399 if (in6_dev->cnf.optimistic_dad &&
2400 !net->ipv6.devconf_all->forwarding && sllao)
2401 addr_flags |= IFA_F_OPTIMISTIC;
2402#endif
2403
2404 /* Do not allow to create too much of autoconfigured
2405 * addresses; this would be too easy way to crash kernel.
2406 */
2407 if (!max_addresses ||
2408 ipv6_count_addresses(in6_dev) < max_addresses)
2409 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2410 pinfo->prefix_len,
2411 addr_type&IPV6_ADDR_SCOPE_MASK,
2412 addr_flags, valid_lft,
2413 prefered_lft);
2414
2415 if (IS_ERR_OR_NULL(ifp))
2416 return -1;
2417
2418 update_lft = 0;
2419 create = 1;
2420 spin_lock_bh(&ifp->lock);
2421 ifp->flags |= IFA_F_MANAGETEMPADDR;
2422 ifp->cstamp = jiffies;
2423 ifp->tokenized = tokenized;
2424 spin_unlock_bh(&ifp->lock);
2425 addrconf_dad_start(ifp);
2426 }
2427
2428 if (ifp) {
2429 u32 flags;
2430 unsigned long now;
2431 u32 stored_lft;
2432
2433 /* update lifetime (RFC2462 5.5.3 e) */
2434 spin_lock_bh(&ifp->lock);
2435 now = jiffies;
2436 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2437 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2438 else
2439 stored_lft = 0;
2440 if (!update_lft && !create && stored_lft) {
2441 const u32 minimum_lft = min_t(u32,
2442 stored_lft, MIN_VALID_LIFETIME);
2443 valid_lft = max(valid_lft, minimum_lft);
2444
2445 /* RFC4862 Section 5.5.3e:
2446 * "Note that the preferred lifetime of the
2447 * corresponding address is always reset to
2448 * the Preferred Lifetime in the received
2449 * Prefix Information option, regardless of
2450 * whether the valid lifetime is also reset or
2451 * ignored."
2452 *
2453 * So we should always update prefered_lft here.
2454 */
2455 update_lft = 1;
2456 }
2457
2458 if (update_lft) {
2459 ifp->valid_lft = valid_lft;
2460 ifp->prefered_lft = prefered_lft;
2461 ifp->tstamp = now;
2462 flags = ifp->flags;
2463 ifp->flags &= ~IFA_F_DEPRECATED;
2464 spin_unlock_bh(&ifp->lock);
2465
2466 if (!(flags&IFA_F_TENTATIVE))
2467 ipv6_ifa_notify(0, ifp);
2468 } else
2469 spin_unlock_bh(&ifp->lock);
2470
2471 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2472 create, now);
2473
2474 in6_ifa_put(ifp);
2475 addrconf_verify();
2476 }
2477
2478 return 0;
2479}
cc84b3c6 2480EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
4f672235 2481
e6bff995 2482void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2483{
2484 struct prefix_info *pinfo;
2485 __u32 valid_lft;
2486 __u32 prefered_lft;
4f672235 2487 int addr_type, err;
64236f3f 2488 u32 addr_flags = 0;
1da177e4 2489 struct inet6_dev *in6_dev;
56d417b1 2490 struct net *net = dev_net(dev);
1da177e4
LT		 2491
2492 pinfo = (struct prefix_info *) opt;
1ab1457c 2493
1da177e4 2494 if (len < sizeof(struct prefix_info)) {
ba3542e1 2495 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2496 return;
2497 }
1ab1457c 2498
1da177e4
LT		 2499 /*
2500 * Validation checks ([ADDRCONF], page 19)
2501 */
2502
2503 addr_type = ipv6_addr_type(&pinfo->prefix);
2504
2505 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2506 return;
2507
2508 valid_lft = ntohl(pinfo->valid);
2509 prefered_lft = ntohl(pinfo->prefered);
2510
2511 if (prefered_lft > valid_lft) {
e87cc472 2512 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2513 return;
2514 }
2515
2516 in6_dev = in6_dev_get(dev);
2517
63159f29 2518 if (!in6_dev) {
e87cc472
JP		 2519 net_dbg_ratelimited("addrconf: device %s not configured\n",
2520 dev->name);
1da177e4
LT		 2521 return;
2522 }
2523
2524 /*
2525 * Two things going on here:
2526 * 1) Add routes for on-link prefixes
2527 * 2) Configure prefixes with the auto flag set
2528 */
2529
4bed72e4
YH		 2530 if (pinfo->onlink) {
2531 struct rt6_info *rt;
2532 unsigned long rt_expires;
2533
6f704992
YH		 2534 /* Avoid arithmetic overflow. Really, we could
2535 * save rt_expires in seconds, likely valid_lft,
2536 * but it would require division in fib gc, that it
2537 * not good.
2538 */
4bed72e4
YH		 2539 if (HZ > USER_HZ)
2540 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2541 else
2542 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2543
4bed72e4
YH		 2544 if (addrconf_finite_timeout(rt_expires))
2545 rt_expires *= HZ;
1da177e4 2546
14ef37b6
AH		 2547 rt = addrconf_get_prefix_route(&pinfo->prefix,
2548 pinfo->prefix_len,
2549 dev,
2550 RTF_ADDRCONF | RTF_PREFIX_RT,
2551 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2552
14ef37b6 2553 if (rt) {
6f704992
YH		 2554 /* Autoconf prefix route */
2555 if (valid_lft == 0) {
2556 ip6_del_rt(rt);
2557 rt = NULL;
4bed72e4 2558 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2559 /* not infinity */
1716a961 2560 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2561 } else {
1716a961 2562 rt6_clean_expires(rt);
1da177e4
LT		 2563 }
2564 } else if (valid_lft) {
6f704992 2565 clock_t expires = 0;
4bed72e4
YH		 2566 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2567 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2568 /* not infinity */
2569 flags |= RTF_EXPIRES;
2570 expires = jiffies_to_clock_t(rt_expires);
2571 }
1da177e4 2572 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2573 dev, expires, flags);
1da177e4 2574 }
94e187c0 2575 ip6_rt_put(rt);
1da177e4
LT		 2576 }
2577
2578 /* Try to figure out our local address for this prefix */
2579
2580 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1da177e4 2581 struct in6_addr addr;
f997c55c 2582 bool tokenized = false, dev_addr_generated = false;
1da177e4
LT		 2583
2584 if (pinfo->prefix_len == 64) {
2585 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2586
2587 if (!ipv6_addr_any(&in6_dev->token)) {
2588 read_lock_bh(&in6_dev->lock);
2589 memcpy(addr.s6_addr + 8,
2590 in6_dev->token.s6_addr + 8, 8);
2591 read_unlock_bh(&in6_dev->lock);
617fe29d 2592 tokenized = true;
cc9da6cc 2593 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2594 !ipv6_generate_stable_address(&addr, 0,
2595 in6_dev)) {
64236f3f 2596 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2597 goto ok;
f53adae4
DB		 2598 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2599 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
4f672235 2600 goto put;
f997c55c
AA		 2601 } else {
2602 dev_addr_generated = true;
1da177e4
LT		 2603 }
2604 goto ok;
2605 }
e87cc472
JP		 2606 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2607 pinfo->prefix_len);
4f672235 2608 goto put;
1da177e4
LT		 2609
2610ok:
4f672235
AA		 2611 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2612 &addr, addr_type,
2613 addr_flags, sllao,
2614 tokenized, valid_lft,
2615 prefered_lft);
2616 if (err)
2617 goto put;
f997c55c
AA		 2618
2619 /* Ignore error case here because previous prefix add addr was
2620 * successful which will be notified.
2621 */
2622 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2623 addr_type, addr_flags, sllao,
2624 tokenized, valid_lft,
2625 prefered_lft,
2626 dev_addr_generated);
1da177e4
LT		 2627 }
2628 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
4f672235 2629put:
1da177e4
LT		 2630 in6_dev_put(in6_dev);
2631}
2632
2633/*
2634 * Set destination address.
2635 * Special case for SIT interfaces where we create a new "virtual"
2636 * device.
2637 */
af284937 2638int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2639{
2640 struct in6_ifreq ireq;
2641 struct net_device *dev;
2642 int err = -EINVAL;
2643
2644 rtnl_lock();
2645
2646 err = -EFAULT;
2647 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2648 goto err_exit;
2649
af284937 2650 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2651
2652 err = -ENODEV;
63159f29 2653 if (!dev)
1da177e4
LT		 2654 goto err_exit;
2655
07a93626 2656#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2657 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2658 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2659 struct ifreq ifr;
1da177e4
LT		 2660 struct ip_tunnel_parm p;
2661
2662 err = -EADDRNOTAVAIL;
2663 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2664 goto err_exit;
2665
2666 memset(&p, 0, sizeof(p));
2667 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2668 p.iph.saddr = 0;
2669 p.iph.version = 4;
2670 p.iph.ihl = 5;
2671 p.iph.protocol = IPPROTO_IPV6;
2672 p.iph.ttl = 64;
d20b3109 2673 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2674
5bc3eb7e
SH		 2675 if (ops->ndo_do_ioctl) {
2676 mm_segment_t oldfs = get_fs();
2677
2678 set_fs(KERNEL_DS);
2679 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2680 set_fs(oldfs);
2681 } else
2682 err = -EOPNOTSUPP;
1da177e4
LT		 2683
2684 if (err == 0) {
2685 err = -ENOBUFS;
af284937
DL		 2686 dev = __dev_get_by_name(net, p.name);
2687 if (!dev)
1da177e4
LT		 2688 goto err_exit;
2689 err = dev_open(dev);
2690 }
2691 }
0be669bb 2692#endif
1da177e4
LT		 2693
2694err_exit:
2695 rtnl_unlock();
2696 return err;
2697}
2698
93a714d6
MC		 2699static int ipv6_mc_config(struct sock *sk, bool join,
2700 const struct in6_addr *addr, int ifindex)
2701{
2702 int ret;
2703
2704 ASSERT_RTNL();
2705
2706 lock_sock(sk);
2707 if (join)
54ff9ef3 2708 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2709 else
54ff9ef3 2710 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2711 release_sock(sk);
2712
2713 return ret;
2714}
2715
1da177e4
LT		 2716/*
2717 * Manual configuration of address on an interface
2718 */
479840ff
JP		 2719static int inet6_addr_add(struct net *net, int ifindex,
2720 const struct in6_addr *pfx,
caeaba79 2721 const struct in6_addr *peer_pfx,
479840ff
JP		 2722 unsigned int plen, __u32 ifa_flags,
2723 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2724{
2725 struct inet6_ifaddr *ifp;
2726 struct inet6_dev *idev;
2727 struct net_device *dev;
93a714d6
MC		 2728 unsigned long timeout;
2729 clock_t expires;
1da177e4 2730 int scope;
6f704992 2731 u32 flags;
1da177e4
LT		 2732
2733 ASSERT_RTNL();
1ab1457c 2734
24ef0da7
TG		 2735 if (plen > 128)
2736 return -EINVAL;
2737
0778769d
NT		 2738 /* check the lifetime */
2739 if (!valid_lft || prefered_lft > valid_lft)
2740 return -EINVAL;
2741
53bd6749
JP		 2742 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2743 return -EINVAL;
2744
af284937
DL		 2745 dev = __dev_get_by_index(net, ifindex);
2746 if (!dev)
1da177e4 2747 return -ENODEV;
1ab1457c 2748
64e724f6
BH		 2749 idev = addrconf_add_dev(dev);
2750 if (IS_ERR(idev))
2751 return PTR_ERR(idev);
1da177e4 2752
93a714d6
MC		 2753 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2754 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2755 true, pfx, ifindex);
2756
2757 if (ret < 0)
2758 return ret;
2759 }
2760
1da177e4
LT		 2761 scope = ipv6_addr_scope(pfx);
2762
4bed72e4
YH		 2763 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2764 if (addrconf_finite_timeout(timeout)) {
2765 expires = jiffies_to_clock_t(timeout * HZ);
2766 valid_lft = timeout;
6f704992 2767 flags = RTF_EXPIRES;
4bed72e4
YH		 2768 } else {
2769 expires = 0;
2770 flags = 0;
2771 ifa_flags |= IFA_F_PERMANENT;
6f704992 2772 }
0778769d 2773
4bed72e4
YH		 2774 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2775 if (addrconf_finite_timeout(timeout)) {
2776 if (timeout == 0)
2777 ifa_flags |= IFA_F_DEPRECATED;
2778 prefered_lft = timeout;
2779 }
0778769d 2780
8a226b2c
JB		 2781 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2782 valid_lft, prefered_lft);
0778769d 2783
1da177e4 2784 if (!IS_ERR(ifp)) {
761aac73
TH		 2785 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2786 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2787 expires, flags);
2788 }
2789
95c385b4
NH		 2790 /*
2791 * Note that section 3.1 of RFC 4429 indicates
2792 * that the Optimistic flag should not be set for
2793 * manually configured addresses
2794 */
cf22f9a2 2795 addrconf_dad_start(ifp);
53bd6749
JP		 2796 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2797 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2798 true, jiffies);
1da177e4 2799 in6_ifa_put(ifp);
c15b1cca 2800 addrconf_verify_rtnl();
1da177e4 2801 return 0;
93a714d6
MC		 2802 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2803 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2804 false, pfx, ifindex);
1da177e4
LT		 2805 }
2806
2807 return PTR_ERR(ifp);
2808}
2809
6046d5b4
HK		 2810static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2811 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2812{
2813 struct inet6_ifaddr *ifp;
2814 struct inet6_dev *idev;
2815 struct net_device *dev;
1ab1457c 2816
24ef0da7
TG		 2817 if (plen > 128)
2818 return -EINVAL;
2819
af284937
DL		 2820 dev = __dev_get_by_index(net, ifindex);
2821 if (!dev)
1da177e4
LT		 2822 return -ENODEV;
2823
e5d08d71 2824 idev = __in6_dev_get(dev);
63159f29 2825 if (!idev)
1da177e4
LT		 2826 return -ENXIO;
2827
2828 read_lock_bh(&idev->lock);
502a2ffd 2829 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2830 if (ifp->prefix_len == plen &&
2831 ipv6_addr_equal(pfx, &ifp->addr)) {
2832 in6_ifa_hold(ifp);
2833 read_unlock_bh(&idev->lock);
1ab1457c 2834
6046d5b4
HK		 2835 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2836 (ifa_flags & IFA_F_MANAGETEMPADDR))
2837 manage_tempaddrs(idev, ifp, 0, 0, false,
2838 jiffies);
1da177e4 2839 ipv6_del_addr(ifp);
6046d5b4 2840 addrconf_verify_rtnl();
93a714d6
MC		 2841 if (ipv6_addr_is_multicast(pfx)) {
2842 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2843 false, pfx, dev->ifindex);
2844 }
1da177e4
LT		 2845 return 0;
2846 }
2847 }
2848 read_unlock_bh(&idev->lock);
2849 return -EADDRNOTAVAIL;
2850}
2851
2852
af284937 2853int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2854{
2855 struct in6_ifreq ireq;
2856 int err;
1ab1457c 2857
af31f412 2858 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2859 return -EPERM;
1ab1457c 2860
1da177e4
LT		 2861 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2862 return -EFAULT;
2863
2864 rtnl_lock();
caeaba79 2865 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2866 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2867 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2868 rtnl_unlock();
2869 return err;
2870}
2871
af284937 2872int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2873{
2874 struct in6_ifreq ireq;
2875 int err;
1ab1457c 2876
af31f412 2877 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2878 return -EPERM;
2879
2880 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2881 return -EFAULT;
2882
2883 rtnl_lock();
6046d5b4 2884 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2885 ireq.ifr6_prefixlen);
1da177e4
LT		 2886 rtnl_unlock();
2887 return err;
2888}
2889
b5f348e5
IJ		 2890static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2891 int plen, int scope)
2892{
2893 struct inet6_ifaddr *ifp;
2894
8a226b2c 2895 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2896 scope, IFA_F_PERMANENT,
2897 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2898 if (!IS_ERR(ifp)) {
2899 spin_lock_bh(&ifp->lock);
2900 ifp->flags &= ~IFA_F_TENTATIVE;
2901 spin_unlock_bh(&ifp->lock);
2902 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2903 in6_ifa_put(ifp);
2904 }
2905}
2906
07a93626 2907#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2908static void sit_add_v4_addrs(struct inet6_dev *idev)
2909{
1da177e4
LT		 2910 struct in6_addr addr;
2911 struct net_device *dev;
c346dca1 2912 struct net *net = dev_net(idev->dev);
929c9cf3 2913 int scope, plen;
f0e2acfa 2914 u32 pflags = 0;
1da177e4
LT		 2915
2916 ASSERT_RTNL();
2917
2918 memset(&addr, 0, sizeof(struct in6_addr));
2919 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2920
2921 if (idev->dev->flags&IFF_POINTOPOINT) {
2922 addr.s6_addr32[0] = htonl(0xfe800000);
2923 scope = IFA_LINK;
929c9cf3 2924 plen = 64;
1da177e4
LT		 2925 } else {
2926 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2927 plen = 96;
f0e2acfa 2928 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2929 }
2930
2931 if (addr.s6_addr32[3]) {
929c9cf3 2932 add_addr(idev, &addr, plen, scope);
f0e2acfa 2933 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2934 return;
2935 }
2936
6fda7350 2937 for_each_netdev(net, dev) {
8e5e8f30 2938 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2939 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2940 struct in_ifaddr *ifa;
1da177e4
LT		 2941
2942 int flag = scope;
2943
2944 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2945
2946 addr.s6_addr32[3] = ifa->ifa_local;
2947
2948 if (ifa->ifa_scope == RT_SCOPE_LINK)
2949 continue;
2950 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2951 if (idev->dev->flags&IFF_POINTOPOINT)
2952 continue;
2953 flag |= IFA_HOST;
2954 }
1da177e4 2955
b5f348e5 2956 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2957 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2958 pflags);
1da177e4
LT		 2959 }
2960 }
1ab1457c 2961 }
1da177e4 2962}
0be669bb 2963#endif
1da177e4
LT		 2964
2965static void init_loopback(struct net_device *dev)
2966{
2967 struct inet6_dev *idev;
25fb6ca4
BK		 2968 struct net_device *sp_dev;
2969 struct inet6_ifaddr *sp_ifa;
2970 struct rt6_info *sp_rt;
1da177e4
LT		 2971
2972 /* ::1 */
2973
2974 ASSERT_RTNL();
2975
e5d08d71 2976 idev = ipv6_find_idev(dev);
63159f29 2977 if (!idev) {
91df42be 2978 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2979 return;
2980 }
2981
b5f348e5 2982 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2983
2984 /* Add routes to other interface's IPv6 addresses */
2985 for_each_netdev(dev_net(dev), sp_dev) {
2986 if (!strcmp(sp_dev->name, dev->name))
2987 continue;
2988
2989 idev = __in6_dev_get(sp_dev);
2990 if (!idev)
2991 continue;
2992
2993 read_lock_bh(&idev->lock);
2994 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2995
2996 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2997 continue;
2998
33d99113
G		 2999 if (sp_ifa->rt) {
3000 /* This dst has been added to garbage list when
3001 * lo device down, release this obsolete dst and
3002 * reallocate a new router for ifa.
3003 */
a220445f 3004 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
33d99113
G		 3005 ip6_rt_put(sp_ifa->rt);
3006 sp_ifa->rt = NULL;
3007 } else {
3008 continue;
3009 }
3010 }
a881ae1f 3011
57ec0afe 3012 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 3013
3014 /* Failure cases are ignored */
534c8779
G		 3015 if (!IS_ERR(sp_rt)) {
3016 sp_ifa->rt = sp_rt;
25fb6ca4 3017 ip6_ins_rt(sp_rt);
534c8779 3018 }
25fb6ca4
BK		 3019 }
3020 read_unlock_bh(&idev->lock);
3021 }
1da177e4
LT		 3022}
3023
2ad3ed59
AA		 3024void addrconf_add_linklocal(struct inet6_dev *idev,
3025 const struct in6_addr *addr, u32 flags)
1da177e4 3026{
8e5e8f30 3027 struct inet6_ifaddr *ifp;
64236f3f 3028 u32 addr_flags = flags | IFA_F_PERMANENT;
95c385b4
NH		 3029
3030#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3031 if (idev->cnf.optimistic_dad &&
702beb87 3032 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 3033 addr_flags |= IFA_F_OPTIMISTIC;
3034#endif
1da177e4 3035
07edd741
HFS		 3036 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3037 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 3038 if (!IS_ERR(ifp)) {
46d48046 3039 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 3040 addrconf_dad_start(ifp);
1da177e4
LT		 3041 in6_ifa_put(ifp);
3042 }
3043}
2ad3ed59 3044EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
1da177e4 3045
622c81d5
HFS		 3046static bool ipv6_reserved_interfaceid(struct in6_addr address)
3047{
3048 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3049 return true;
3050
3051 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3052 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3053 return true;
3054
3055 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3056 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3057 return true;
3058
3059 return false;
3060}
3061
3062static int ipv6_generate_stable_address(struct in6_addr *address,
3063 u8 dad_count,
3064 const struct inet6_dev *idev)
3065{
622c81d5
HFS		 3066 static DEFINE_SPINLOCK(lock);
3067 static __u32 digest[SHA_DIGEST_WORDS];
3068 static __u32 workspace[SHA_WORKSPACE_WORDS];
3069
3070 static union {
3071 char __data[SHA_MESSAGE_BYTES];
3072 struct {
3073 struct in6_addr secret;
ff40217e 3074 __be32 prefix[2];
622c81d5
HFS		 3075 unsigned char hwaddr[MAX_ADDR_LEN];
3076 u8 dad_count;
3077 } __packed;
3078 } data;
3079
3080 struct in6_addr secret;
3081 struct in6_addr temp;
3082 struct net *net = dev_net(idev->dev);
3083
3084 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3085
3086 if (idev->cnf.stable_secret.initialized)
3087 secret = idev->cnf.stable_secret.secret;
3088 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3089 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3090 else
3091 return -1;
3092
3093retry:
3094 spin_lock_bh(&lock);
3095
3096 sha_init(digest);
3097 memset(&data, 0, sizeof(data));
3098 memset(workspace, 0, sizeof(workspace));
3099 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3100 data.prefix[0] = address->s6_addr32[0];
3101 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3102 data.secret = secret;
3103 data.dad_count = dad_count;
3104
3105 sha_transform(digest, data.__data, workspace);
3106
3107 temp = *address;
ff40217e
HFS		 3108 temp.s6_addr32[2] = (__force __be32)digest[0];
3109 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3110
3111 spin_unlock_bh(&lock);
3112
3113 if (ipv6_reserved_interfaceid(temp)) {
3114 dad_count++;
1855b7c3 3115 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3116 return -1;
3117 goto retry;
3118 }
3119
3120 *address = temp;
3121 return 0;
3122}
3123
cc9da6cc
BM		 3124static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3125{
3126 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3127
3128 if (s->initialized)
3129 return;
3130 s = &idev->cnf.stable_secret;
3131 get_random_bytes(&s->secret, sizeof(s->secret));
3132 s->initialized = true;
3133}
3134
bc91b0f0
JP		 3135static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3136{
622c81d5
HFS		 3137 struct in6_addr addr;
3138
ca254490
DA		 3139 /* no link local addresses on L3 master devices */
3140 if (netif_is_l3_master(idev->dev))
3141 return;
3142
622c81d5 3143 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3144
cc9da6cc
BM		 3145 switch (idev->addr_gen_mode) {
3146 case IN6_ADDR_GEN_MODE_RANDOM:
3147 ipv6_gen_mode_random_init(idev);
3148 /* fallthrough */
3149 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3150 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3151 addrconf_add_linklocal(idev, &addr,
3152 IFA_F_STABLE_PRIVACY);
622c81d5
HFS		 3153 else if (prefix_route)
3154 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3155 break;
3156 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3157 /* addrconf_add_linklocal also adds a prefix_route and we
3158 * only need to care about prefix routes if ipv6_generate_eui64
3159 * couldn't generate one.
3160 */
3161 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3162 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0
JP		 3163 else if (prefix_route)
3164 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3165 break;
3166 case IN6_ADDR_GEN_MODE_NONE:
3167 default:
3168 /* will not add any link local address */
3169 break;
bc91b0f0
JP		 3170 }
3171}
3172
1da177e4
LT		 3173static void addrconf_dev_config(struct net_device *dev)
3174{
8e5e8f30 3175 struct inet6_dev *idev;
1da177e4
LT		 3176
3177 ASSERT_RTNL();
3178
74235a25
HX		 3179 if ((dev->type != ARPHRD_ETHER) &&
3180 (dev->type != ARPHRD_FDDI) &&
74235a25 3181 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3182 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3183 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3184 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc
BM		 3185 (dev->type != ARPHRD_6LOWPAN) &&
3186 (dev->type != ARPHRD_NONE)) {
74235a25
HX		 3187 /* Alas, we support only Ethernet autoconfiguration. */
3188 return;
3189 }
3190
1da177e4 3191 idev = addrconf_add_dev(dev);
64e724f6 3192 if (IS_ERR(idev))
1da177e4
LT		 3193 return;
3194
cc9da6cc
BM		 3195 /* this device type has no EUI support */
3196 if (dev->type == ARPHRD_NONE &&
3197 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3198 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3199
bc91b0f0 3200 addrconf_addr_gen(idev, false);
1da177e4
LT		 3201}
3202
07a93626 3203#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3204static void addrconf_sit_config(struct net_device *dev)
3205{
3206 struct inet6_dev *idev;
3207
3208 ASSERT_RTNL();
3209
1ab1457c
YH		 3210 /*
3211 * Configure the tunnel with one of our IPv4
3212 * addresses... we should configure all of
1da177e4
LT		 3213 * our v4 addrs in the tunnel
3214 */
3215
e5d08d71 3216 idev = ipv6_find_idev(dev);
63159f29 3217 if (!idev) {
91df42be 3218 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3219 return;
3220 }
3221
c7dc89c0 3222 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3223 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3224 return;
3225 }
3226
1da177e4
LT		 3227 sit_add_v4_addrs(idev);
3228
62b54dd9 3229 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3230 addrconf_add_mroute(dev);
1da177e4 3231}
0be669bb 3232#endif
1da177e4 3233
07a93626 3234#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3235static void addrconf_gre_config(struct net_device *dev)
3236{
3237 struct inet6_dev *idev;
aee80b54 3238
aee80b54 3239 ASSERT_RTNL();
3240
e5d08d71 3241 idev = ipv6_find_idev(dev);
63159f29 3242 if (!idev) {
91df42be 3243 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3244 return;
3245 }
3246
bc91b0f0 3247 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3248 if (dev->flags & IFF_POINTOPOINT)
3249 addrconf_add_mroute(dev);
aee80b54 3250}
3251#endif
3252
f1705ec1
DA		 3253static int fixup_permanent_addr(struct inet6_dev *idev,
3254 struct inet6_ifaddr *ifp)
3255{
3256 if (!ifp->rt) {
3257 struct rt6_info *rt;
3258
3259 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3260 if (unlikely(IS_ERR(rt)))
3261 return PTR_ERR(rt);
3262
3263 ifp->rt = rt;
3264 }
3265
3266 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3267 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3268 idev->dev, 0, 0);
3269 }
3270
3271 addrconf_dad_start(ifp);
3272
3273 return 0;
3274}
3275
3276static void addrconf_permanent_addr(struct net_device *dev)
3277{
3278 struct inet6_ifaddr *ifp, *tmp;
3279 struct inet6_dev *idev;
3280
3281 idev = __in6_dev_get(dev);
3282 if (!idev)
3283 return;
3284
3285 write_lock_bh(&idev->lock);
3286
3287 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3288 if ((ifp->flags & IFA_F_PERMANENT) &&
3289 fixup_permanent_addr(idev, ifp) < 0) {
3290 write_unlock_bh(&idev->lock);
3291 ipv6_del_addr(ifp);
3292 write_lock_bh(&idev->lock);
3293
3294 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3295 idev->dev->name, &ifp->addr);
3296 }
3297 }
3298
3299 write_unlock_bh(&idev->lock);
3300}
3301
1ab1457c 3302static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3303 void *ptr)
1da177e4 3304{
351638e7 3305 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4f7f34ea 3306 struct netdev_notifier_changeupper_info *info;
748e2d93 3307 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 3308 int run_pending = 0;
b217d616 3309 int err;
1da177e4 3310
e21e8467 3311 switch (event) {
45ba9dd2 3312 case NETDEV_REGISTER:
74235a25 3313 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3314 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3315 if (IS_ERR(idev))
3316 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3317 }
3318 break;
bcdd553f 3319
b7b0b1d2
AD		 3320 case NETDEV_CHANGEMTU:
3321 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3322 if (dev->mtu < IPV6_MIN_MTU) {
3323 addrconf_ifdown(dev, 1);
3324 break;
3325 }
3326
3327 if (idev) {
3328 rt6_mtu_change(dev, dev->mtu);
3329 idev->cnf.mtu6 = dev->mtu;
3330 break;
3331 }
3332
3333 /* allocate new idev */
3334 idev = ipv6_add_dev(dev);
3335 if (IS_ERR(idev))
3336 break;
3337
3338 /* device is still not ready */
3339 if (!(idev->if_flags & IF_READY))
3340 break;
3341
3342 run_pending = 1;
3343
3344 /* fall through */
3345
1da177e4 3346 case NETDEV_UP:
3c21edbd 3347 case NETDEV_CHANGE:
c2edacf8
JV		 3348 if (dev->flags & IFF_SLAVE)
3349 break;
3350
3ce62a84
WC		 3351 if (idev && idev->cnf.disable_ipv6)
3352 break;
3353
3c21edbd 3354 if (event == NETDEV_UP) {
38bd10c4
DA		 3355 /* restore routes for permanent addresses */
3356 addrconf_permanent_addr(dev);
3357
f24e3d65 3358 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 3359 /* device is not ready yet. */
f3213831 3360 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3361 dev->name);
3362 break;
3363 }
99081049 3364
d31c7b8f
EP		 3365 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3366 idev = ipv6_add_dev(dev);
3367
a317a2f1 3368 if (!IS_ERR_OR_NULL(idev)) {
99081049 3369 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3370 run_pending = 1;
3371 }
b7b0b1d2 3372 } else if (event == NETDEV_CHANGE) {
f24e3d65 3373 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 3374 /* device is still not ready. */
3375 break;
3376 }
3377
3378 if (idev) {
bcdd553f 3379 if (idev->if_flags & IF_READY)
3c21edbd
YH		 3380 /* device is already configured. */
3381 break;
3c21edbd
YH		 3382 idev->if_flags |= IF_READY;
3383 }
3384
f3213831
JP		 3385 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3386 dev->name);
3c21edbd 3387
c5e33bdd 3388 run_pending = 1;
3c21edbd
YH		 3389 }
3390
e21e8467 3391 switch (dev->type) {
07a93626 3392#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3393 case ARPHRD_SIT:
3394 addrconf_sit_config(dev);
3395 break;
aee80b54 3396#endif
07a93626 3397#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3398 case ARPHRD_IPGRE:
3399 addrconf_gre_config(dev);
3400 break;
0be669bb 3401#endif
1da177e4
LT		 3402 case ARPHRD_LOOPBACK:
3403 init_loopback(dev);
3404 break;
3405
3406 default:
3407 addrconf_dev_config(dev);
3408 break;
3ff50b79 3409 }
bcdd553f 3410
a317a2f1 3411 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3412 if (run_pending)
3413 addrconf_dad_run(idev);
3414
bcdd553f
SH		 3415 /*
3416 * If the MTU changed during the interface down,
3417 * when the interface up, the changed MTU must be
3418 * reflected in the idev as well as routers.
1da177e4 3419 */
bcdd553f
SH		 3420 if (idev->cnf.mtu6 != dev->mtu &&
3421 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3422 rt6_mtu_change(dev, dev->mtu);
3423 idev->cnf.mtu6 = dev->mtu;
3424 }
3425 idev->tstamp = jiffies;
3426 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3427
3428 /*
3429 * If the changed mtu during down is lower than
3430 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3431 */
3432 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 3433 addrconf_ifdown(dev, 1);
1da177e4
LT		 3434 }
3435 break;
3436
1da177e4
LT		 3437 case NETDEV_DOWN:
3438 case NETDEV_UNREGISTER:
3439 /*
3440 * Remove all addresses from this interface.
3441 */
3442 addrconf_ifdown(dev, event != NETDEV_DOWN);
3443 break;
3c21edbd 3444
1da177e4 3445 case NETDEV_CHANGENAME:
1da177e4 3446 if (idev) {
5632c515 3447 snmp6_unregister_dev(idev);
408c4768 3448 addrconf_sysctl_unregister(idev);
a317a2f1 3449 err = addrconf_sysctl_register(idev);
b217d616
HX		 3450 if (err)
3451 return notifier_from_errno(err);
a317a2f1
WC		 3452 err = snmp6_register_dev(idev);
3453 if (err) {
3454 addrconf_sysctl_unregister(idev);
3455 return notifier_from_errno(err);
3456 }
5632c515 3457 }
1da177e4 3458 break;
bcdd553f 3459
93d9b7d7
JP		 3460 case NETDEV_PRE_TYPE_CHANGE:
3461 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3462 if (idev)
3463 addrconf_type_change(dev, event);
75c78500 3464 break;
4f7f34ea
DA		 3465
3466 case NETDEV_CHANGEUPPER:
3467 info = ptr;
3468
3469 /* flush all routes if dev is linked to or unlinked from
3470 * an L3 master device (e.g., VRF)
3471 */
3472 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3473 addrconf_ifdown(dev, 0);
3ff50b79 3474 }
1da177e4
LT		 3475
3476 return NOTIFY_OK;
3477}
3478
3479/*
3480 * addrconf module should be notified of a device going up
3481 */
3482static struct notifier_block ipv6_dev_notf = {
3483 .notifier_call = addrconf_notify,
1da177e4
LT		 3484};
3485
93d9b7d7 3486static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3487{
3488 struct inet6_dev *idev;
3489 ASSERT_RTNL();
3490
3491 idev = __in6_dev_get(dev);
3492
93d9b7d7 3493 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3494 ipv6_mc_remap(idev);
93d9b7d7 3495 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3496 ipv6_mc_unmap(idev);
3497}
3498
70af921d
DA		 3499static bool addr_is_local(const struct in6_addr *addr)
3500{
3501 return ipv6_addr_type(addr) &
3502 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3503}
3504
1da177e4
LT		 3505static int addrconf_ifdown(struct net_device *dev, int how)
3506{
c346dca1 3507 struct net *net = dev_net(dev);
502a2ffd 3508 struct inet6_dev *idev;
f1705ec1
DA		 3509 struct inet6_ifaddr *ifa, *tmp;
3510 struct list_head del_list;
3511 int _keep_addr;
3512 bool keep_addr;
73a8bd74 3513 int state, i;
1da177e4
LT		 3514
3515 ASSERT_RTNL();
3516
73a8bd74
DM		 3517 rt6_ifdown(net, dev);
3518 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3519
3520 idev = __in6_dev_get(dev);
63159f29 3521 if (!idev)
1da177e4
LT		 3522 return -ENODEV;
3523
bcdd553f
SH		 3524 /*
3525 * Step 1: remove reference to ipv6 device from parent device.
3526 * Do not dev_put!
1da177e4 3527 */
439e2385 3528 if (how) {
1da177e4 3529 idev->dead = 1;
8814c4b5
YH		 3530
3531 /* protected by rtnl_lock */
a9b3cd7f 3532 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3533
3534 /* Step 1.5: remove snmp6 entry */
3535 snmp6_unregister_dev(idev);
3536
3537 }
3538
f1705ec1
DA		 3539 /* aggregate the system setting and interface setting */
3540 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3541 if (!_keep_addr)
3542 _keep_addr = idev->cnf.keep_addr_on_down;
3543
3544 /* combine the user config with event to determine if permanent
3545 * addresses are to be removed from address hash table
3546 */
bc561632 3547 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
f1705ec1 3548
73a8bd74
DM		 3549 /* Step 2: clear hash table */
3550 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3551 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3552
3553 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3554restart:
b67bfe0d 3555 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3556 if (ifa->idev == idev) {
c15b1cca 3557 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3558 /* combined flag + permanent flag decide if
3559 * address is retained on a down event
3560 */
3561 if (!keep_addr ||
70af921d
DA		 3562 !(ifa->flags & IFA_F_PERMANENT) ||
3563 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3564 hlist_del_init_rcu(&ifa->addr_lst);
3565 goto restart;
3566 }
73a8bd74
DM		 3567 }
3568 }
3569 spin_unlock_bh(&addrconf_hash_lock);
3570 }
3571
1da177e4
LT		 3572 write_lock_bh(&idev->lock);
3573
b7b1bfce
HFS		 3574 addrconf_del_rs_timer(idev);
3575
bcdd553f 3576 /* Step 2: clear flags for stateless addrconf */
439e2385 3577 if (!how)
3c21edbd 3578 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3579
bcdd553f 3580 /* Step 3: clear tempaddr list */
372e6c8f 3581 while (!list_empty(&idev->tempaddr_list)) {
3582 ifa = list_first_entry(&idev->tempaddr_list,
3583 struct inet6_ifaddr, tmp_list);
3584 list_del(&ifa->tmp_list);
1da177e4
LT		 3585 write_unlock_bh(&idev->lock);
3586 spin_lock_bh(&ifa->lock);
3587
3588 if (ifa->ifpub) {
3589 in6_ifa_put(ifa->ifpub);
3590 ifa->ifpub = NULL;
3591 }
3592 spin_unlock_bh(&ifa->lock);
3593 in6_ifa_put(ifa);
3594 write_lock_bh(&idev->lock);
3595 }
8f37ada5 3596
f1705ec1
DA		 3597 /* re-combine the user config with event to determine if permanent
3598 * addresses are to be removed from the interface list
3599 */
bc561632 3600 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
84e8b803 3601
f1705ec1
DA		 3602 INIT_LIST_HEAD(&del_list);
3603 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
38bd10c4
DA		 3604 struct rt6_info *rt = NULL;
3605
f1705ec1 3606 addrconf_del_dad_work(ifa);
84e8b803 3607
73a8bd74 3608 write_unlock_bh(&idev->lock);
8e8e676d 3609 spin_lock_bh(&ifa->lock);
f1705ec1 3610
70af921d
DA		 3611 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3612 !addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3613 /* set state to skip the notifier below */
3614 state = INET6_IFADDR_STATE_DEAD;
3615 ifa->state = 0;
3616 if (!(ifa->flags & IFA_F_NODAD))
3617 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3618
3619 rt = ifa->rt;
3620 ifa->rt = NULL;
f1705ec1
DA		 3621 } else {
3622 state = ifa->state;
3623 ifa->state = INET6_IFADDR_STATE_DEAD;
3624
c882219a 3625 list_move(&ifa->if_list, &del_list);
f1705ec1
DA		 3626 }
3627
8e8e676d 3628 spin_unlock_bh(&ifa->lock);
9d82ca98 3629
38bd10c4
DA		 3630 if (rt)
3631 ip6_del_rt(rt);
3632
73a8bd74
DM		 3633 if (state != INET6_IFADDR_STATE_DEAD) {
3634 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3635 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
ea06f717
MM		 3636 } else {
3637 if (idev->cnf.forwarding)
3638 addrconf_leave_anycast(ifa);
3639 addrconf_leave_solict(ifa->idev, &ifa->addr);
27bdb2ab 3640 }
8f37ada5 3641
73a8bd74
DM		 3642 write_lock_bh(&idev->lock);
3643 }
8f37ada5 3644
1da177e4
LT		 3645 write_unlock_bh(&idev->lock);
3646
f1705ec1
DA		 3647 /* now clean up addresses to be removed */
3648 while (!list_empty(&del_list)) {
3649 ifa = list_first_entry(&del_list,
3650 struct inet6_ifaddr, if_list);
3651 list_del(&ifa->if_list);
3652
3653 in6_ifa_put(ifa);
3654 }
3655
381f4dca
SD		 3656 /* Step 5: Discard anycast and multicast list */
3657 if (how) {
3658 ipv6_ac_destroy_dev(idev);
1da177e4 3659 ipv6_mc_destroy_dev(idev);
381f4dca 3660 } else {
1da177e4 3661 ipv6_mc_down(idev);
381f4dca 3662 }
1da177e4 3663
1da177e4 3664 idev->tstamp = jiffies;
1ab1457c 3665
bcdd553f 3666 /* Last: Shot the device (if unregistered) */
439e2385 3667 if (how) {
408c4768 3668 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3669 neigh_parms_release(&nd_tbl, idev->nd_parms);
3670 neigh_ifdown(&nd_tbl, dev);
3671 in6_dev_put(idev);
3672 }
3673 return 0;
3674}
3675
3676static void addrconf_rs_timer(unsigned long data)
3677{
b7b1bfce 3678 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3679 struct net_device *dev = idev->dev;
b7b1bfce 3680 struct in6_addr lladdr;
1da177e4 3681
b7b1bfce 3682 write_lock(&idev->lock);
5b2a1953 3683 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3684 goto out;
3685
9ba2add3 3686 if (!ipv6_accept_ra(idev))
5b2a1953 3687 goto out;
3688
3689 /* Announcement received after solicitation was sent */
3690 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3691 goto out;
1da177e4 3692
bd11f074 3693 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
caf92bc4
CW		 3694 write_unlock(&idev->lock);
3695 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3696 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3697 &in6addr_linklocal_allrouters);
3698 else
caf92bc4 3699 goto put;
1da177e4 3700
caf92bc4 3701 write_lock(&idev->lock);
bd11f074
MŻ		 3702 idev->rs_interval = rfc3315_s14_backoff_update(
3703 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
b7b1bfce
HFS		 3704 /* The wait after the last probe can be shorter */
3705 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3706 idev->cnf.rtr_solicits) ?
3707 idev->cnf.rtr_solicit_delay :
bd11f074 3708 idev->rs_interval);
1da177e4 3709 } else {
1da177e4
LT		 3710 /*
3711 * Note: we do not support deprecated "all on-link"
3712 * assumption any longer.
3713 */
91df42be 3714 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3715 }
3716
3717out:
b7b1bfce 3718 write_unlock(&idev->lock);
caf92bc4 3719put:
b7b1bfce 3720 in6_dev_put(idev);
1da177e4
LT		 3721}
3722
3723/*
3724 * Duplicate Address Detection
3725 */
3c21edbd
YH		 3726static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3727{
3728 unsigned long rand_num;
3729 struct inet6_dev *idev = ifp->idev;
3730
95c385b4
NH		 3731 if (ifp->flags & IFA_F_OPTIMISTIC)
3732 rand_num = 0;
3733 else
63862b5b 3734 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3735
b7b1bfce 3736 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3737 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3738}
3739
c15b1cca 3740static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3741{
3742 struct inet6_dev *idev = ifp->idev;
3743 struct net_device *dev = idev->dev;
16186a82 3744 bool notify = false;
1da177e4
LT		 3745
3746 addrconf_join_solict(dev, &ifp->addr);
3747
63862b5b 3748 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3749
3750 read_lock_bh(&idev->lock);
622ccdf1 3751 spin_lock(&ifp->lock);
e9d3e084 3752 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3753 goto out;
1da177e4
LT		 3754
3755 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3756 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3757 !(ifp->flags&IFA_F_TENTATIVE) ||
3758 ifp->flags & IFA_F_NODAD) {
cc411d0b 3759 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3760 spin_unlock(&ifp->lock);
1da177e4
LT		 3761 read_unlock_bh(&idev->lock);
3762
3763 addrconf_dad_completed(ifp);
3764 return;
3765 }
3766
6732bade 3767 if (!(idev->if_flags & IF_READY)) {
21809faf 3768 spin_unlock(&ifp->lock);
6732bade 3769 read_unlock_bh(&idev->lock);
3c21edbd 3770 /*
590a9887 3771 * If the device is not ready:
3c21edbd
YH		 3772 * - keep it tentative if it is a permanent address.
3773 * - otherwise, kill it.
3774 */
3775 in6_ifa_hold(ifp);
cc411d0b 3776 addrconf_dad_stop(ifp, 0);
6732bade 3777 return;
3c21edbd 3778 }
95c385b4
NH		 3779
3780 /*
3781 * Optimistic nodes can start receiving
3782 * Frames right away
3783 */
7fd2561e 3784 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3785 ip6_ins_rt(ifp->rt);
7fd2561e
EK		 3786 if (ipv6_use_optimistic_addr(idev)) {
3787 /* Because optimistic nodes can use this address,
3788 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3789 */
16186a82 3790 notify = true;
7fd2561e
EK		 3791 }
3792 }
95c385b4 3793
6732bade 3794 addrconf_dad_kick(ifp);
1da177e4 3795out:
622ccdf1 3796 spin_unlock(&ifp->lock);
1da177e4 3797 read_unlock_bh(&idev->lock);
16186a82
SAK		 3798 if (notify)
3799 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 3800}
3801
c15b1cca 3802static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3803{
c15b1cca
HFS		 3804 bool begin_dad = false;
3805
8e8e676d 3806 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3807 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3808 ifp->state = INET6_IFADDR_STATE_PREDAD;
3809 begin_dad = true;
3810 }
8e8e676d 3811 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3812
3813 if (begin_dad)
3814 addrconf_mod_dad_work(ifp, 0);
3815}
3816
3817static void addrconf_dad_work(struct work_struct *w)
3818{
3819 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3820 struct inet6_ifaddr,
3821 dad_work);
1da177e4 3822 struct inet6_dev *idev = ifp->idev;
1da177e4 3823 struct in6_addr mcaddr;
85b51b12 3824 bool disable_ipv6 = false;
1da177e4 3825
c15b1cca
HFS		 3826 enum {
3827 DAD_PROCESS,
3828 DAD_BEGIN,
3829 DAD_ABORT,
3830 } action = DAD_PROCESS;
3831
3832 rtnl_lock();
3833
8e8e676d 3834 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3835 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3836 action = DAD_BEGIN;
3837 ifp->state = INET6_IFADDR_STATE_DAD;
3838 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3839 action = DAD_ABORT;
3840 ifp->state = INET6_IFADDR_STATE_POSTDAD;
85b51b12
MM		 3841
3842 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3843 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3844 struct in6_addr addr;
3845
3846 addr.s6_addr32[0] = htonl(0xfe800000);
3847 addr.s6_addr32[1] = 0;
3848
3849 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3850 ipv6_addr_equal(&ifp->addr, &addr)) {
3851 /* DAD failed for link-local based on MAC */
3852 idev->cnf.disable_ipv6 = 1;
3853
3854 pr_info("%s: IPv6 being disabled!\n",
3855 ifp->idev->dev->name);
3856 disable_ipv6 = true;
3857 }
3858 }
c15b1cca 3859 }
8e8e676d 3860 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3861
3862 if (action == DAD_BEGIN) {
3863 addrconf_dad_begin(ifp);
3864 goto out;
3865 } else if (action == DAD_ABORT) {
751eb6b6 3866 in6_ifa_hold(ifp);
c15b1cca 3867 addrconf_dad_stop(ifp, 1);
85b51b12
MM		 3868 if (disable_ipv6)
3869 addrconf_ifdown(idev->dev, 0);
c15b1cca
HFS		 3870 goto out;
3871 }
3872
b7b1bfce 3873 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3874 goto out;
3875
c15b1cca 3876 write_lock_bh(&idev->lock);
122e4519 3877 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3878 write_unlock_bh(&idev->lock);
1da177e4
LT		 3879 goto out;
3880 }
21809faf 3881
3882 spin_lock(&ifp->lock);
622ccdf1
HX		 3883 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3884 spin_unlock(&ifp->lock);
c15b1cca 3885 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3886 goto out;
3887 }
3888
b7b1bfce 3889 if (ifp->dad_probes == 0) {
1da177e4
LT		 3890 /*
3891 * DAD was successful
3892 */
3893
cc411d0b 3894 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3895 spin_unlock(&ifp->lock);
c15b1cca 3896 write_unlock_bh(&idev->lock);
1da177e4
LT		 3897
3898 addrconf_dad_completed(ifp);
3899
3900 goto out;
3901 }
3902
b7b1bfce 3903 ifp->dad_probes--;
c15b1cca
HFS		 3904 addrconf_mod_dad_work(ifp,
3905 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3906 spin_unlock(&ifp->lock);
c15b1cca 3907 write_unlock_bh(&idev->lock);
1da177e4
LT		 3908
3909 /* send a neighbour solicitation for our addr */
1da177e4 3910 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
304d888b 3911 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3912out:
3913 in6_ifa_put(ifp);
c15b1cca 3914 rtnl_unlock();
1da177e4
LT		 3915}
3916
11ffff75
HFS		 3917/* ifp->idev must be at least read locked */
3918static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3919{
3920 struct inet6_ifaddr *ifpiter;
3921 struct inet6_dev *idev = ifp->idev;
3922
602582ca
HFS		 3923 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3924 if (ifpiter->scope > IFA_LINK)
3925 break;
11ffff75
HFS		 3926 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3927 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3928 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3929 IFA_F_PERMANENT)
3930 return false;
3931 }
3932 return true;
3933}
3934
1da177e4
LT		 3935static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3936{
e21e8467 3937 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3938 struct in6_addr lladdr;
b173ee48 3939 bool send_rs, send_mld;
b7b1bfce 3940
c15b1cca 3941 addrconf_del_dad_work(ifp);
1da177e4
LT		 3942
3943 /*
3944 * Configure the address for reception. Now it is valid.
3945 */
3946
3947 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3948
026359bc
TA		 3949 /* If added prefix is link local and we are prepared to process
3950 router advertisements, start sending router solicitations.
1da177e4
LT		 3951 */
3952
1ec047eb 3953 read_lock_bh(&ifp->idev->lock);
11ffff75 3954 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 3955 send_rs = send_mld &&
3956 ipv6_accept_ra(ifp->idev) &&
bd11f074 3957 ifp->idev->cnf.rtr_solicits != 0 &&
b173ee48 3958 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 3959 read_unlock_bh(&ifp->idev->lock);
3960
b173ee48
HFS		 3961 /* While dad is in progress mld report's source address is in6_addrany.
3962 * Resend with proper ll now.
3963 */
3964 if (send_mld)
3965 ipv6_mc_dad_complete(ifp->idev);
3966
1ec047eb 3967 if (send_rs) {
1da177e4
LT		 3968 /*
3969 * If a host as already performed a random delay
3970 * [...] as part of DAD [...] there is no need
3971 * to delay again before sending the first RS
3972 */
1ec047eb 3973 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 3974 return;
1ec047eb 3975 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 3976
b7b1bfce
HFS		 3977 write_lock_bh(&ifp->idev->lock);
3978 spin_lock(&ifp->lock);
bd11f074
MŻ		 3979 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
3980 ifp->idev->cnf.rtr_solicit_interval);
b7b1bfce 3981 ifp->idev->rs_probes = 1;
1da177e4 3982 ifp->idev->if_flags |= IF_RS_SENT;
bd11f074 3983 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
b7b1bfce
HFS		 3984 spin_unlock(&ifp->lock);
3985 write_unlock_bh(&ifp->idev->lock);
1da177e4
LT		 3986 }
3987}
3988
e21e8467
SH		 3989static void addrconf_dad_run(struct inet6_dev *idev)
3990{
c5e33bdd
YH		 3991 struct inet6_ifaddr *ifp;
3992
3993 read_lock_bh(&idev->lock);
502a2ffd 3994 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3995 spin_lock(&ifp->lock);
f2344a13
HX		 3996 if (ifp->flags & IFA_F_TENTATIVE &&
3997 ifp->state == INET6_IFADDR_STATE_DAD)
3998 addrconf_dad_kick(ifp);
21809faf 3999 spin_unlock(&ifp->lock);
c5e33bdd
YH		 4000 }
4001 read_unlock_bh(&idev->lock);
4002}
4003
1da177e4
LT		 4004#ifdef CONFIG_PROC_FS
4005struct if6_iter_state {
3c40090a 4006 struct seq_net_private p;
1da177e4 4007 int bucket;
1d578303 4008 int offset;
1da177e4
LT		 4009};
4010
1d578303 4011static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 4012{
4013 struct inet6_ifaddr *ifa = NULL;
4014 struct if6_iter_state *state = seq->private;
1218854a 4015 struct net *net = seq_file_net(seq);
1d578303 4016 int p = 0;
1da177e4 4017
1d578303
MM		 4018 /* initial bucket if pos is 0 */
4019 if (pos == 0) {
4020 state->bucket = 0;
4021 state->offset = 0;
4022 }
4023
4024 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 4025 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 4026 addr_lst) {
9f0d3c27
ED		 4027 if (!net_eq(dev_net(ifa->idev->dev), net))
4028 continue;
1d578303
MM		 4029 /* sync with offset */
4030 if (p < state->offset) {
4031 p++;
4032 continue;
4033 }
4034 state->offset++;
9f0d3c27 4035 return ifa;
1d578303
MM		 4036 }
4037
4038 /* prepare for next bucket */
4039 state->offset = 0;
4040 p = 0;
1da177e4 4041 }
c2e21293 4042 return NULL;
1da177e4
LT		 4043}
4044
c2e21293 4045static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4046 struct inet6_ifaddr *ifa)
1da177e4
LT		 4047{
4048 struct if6_iter_state *state = seq->private;
1218854a 4049 struct net *net = seq_file_net(seq);
1da177e4 4050
b67bfe0d 4051 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 4052 if (!net_eq(dev_net(ifa->idev->dev), net))
4053 continue;
1d578303 4054 state->offset++;
9f0d3c27 4055 return ifa;
1d578303 4056 }
3c40090a 4057
c2e21293 4058 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 4059 state->offset = 0;
b67bfe0d 4060 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 4061 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 4062 if (!net_eq(dev_net(ifa->idev->dev), net))
4063 continue;
1d578303 4064 state->offset++;
9f0d3c27 4065 return ifa;
c2e21293 4066 }
1da177e4 4067 }
3c40090a 4068
c2e21293 4069 return NULL;
1da177e4
LT		 4070}
4071
1da177e4 4072static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 4073 __acquires(rcu_bh)
1da177e4 4074{
5c578aed 4075 rcu_read_lock_bh();
1d578303 4076 return if6_get_first(seq, *pos);
1da177e4
LT		 4077}
4078
4079static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4080{
4081 struct inet6_ifaddr *ifa;
4082
4083 ifa = if6_get_next(seq, v);
4084 ++*pos;
4085 return ifa;
4086}
4087
4088static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 4089 __releases(rcu_bh)
1da177e4 4090{
5c578aed 4091 rcu_read_unlock_bh();
1da177e4
LT		 4092}
4093
4094static int if6_seq_show(struct seq_file *seq, void *v)
4095{
4096 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4097 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4098 &ifp->addr,
1da177e4
LT		 4099 ifp->idev->dev->ifindex,
4100 ifp->prefix_len,
4101 ifp->scope,
971a351c 4102 (u8) ifp->flags,
1da177e4
LT		 4103 ifp->idev->dev->name);
4104 return 0;
4105}
4106
56b3d975 4107static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4108 .start = if6_seq_start,
4109 .next = if6_seq_next,
4110 .show = if6_seq_show,
4111 .stop = if6_seq_stop,
4112};
4113
4114static int if6_seq_open(struct inode *inode, struct file *file)
4115{
3c40090a
DL		 4116 return seq_open_net(inode, file, &if6_seq_ops,
4117 sizeof(struct if6_iter_state));
1da177e4
LT		 4118}
4119
9a32144e 4120static const struct file_operations if6_fops = {
1da177e4
LT		 4121 .owner = THIS_MODULE,
4122 .open = if6_seq_open,
4123 .read = seq_read,
4124 .llseek = seq_lseek,
3c40090a 4125 .release = seq_release_net,
1da177e4
LT		 4126};
4127
2c8c1e72 4128static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4129{
d4beaa66 4130 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 4131 return -ENOMEM;
4132 return 0;
4133}
4134
2c8c1e72 4135static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4136{
ece31ffd 4137 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4138}
4139
4140static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4141 .init = if6_proc_net_init,
4142 .exit = if6_proc_net_exit,
3c40090a
DL		 4143};
4144
4145int __init if6_proc_init(void)
4146{
4147 return register_pernet_subsys(&if6_proc_net_ops);
4148}
4149
1da177e4
LT		 4150void if6_proc_exit(void)
4151{
3c40090a 4152 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4153}
4154#endif /* CONFIG_PROC_FS */
4155
07a93626 4156#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4157/* Check if address is a home address configured on any interface. */
b71d1d42 4158int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 4159{
4160 int ret = 0;
c2e21293 4161 struct inet6_ifaddr *ifp = NULL;
ddbe5032 4162 unsigned int hash = inet6_addr_hash(addr);
c2e21293 4163
5c578aed 4164 rcu_read_lock_bh();
b67bfe0d 4165 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 4166 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 4167 continue;
caad295f 4168 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4169 (ifp->flags & IFA_F_HOMEADDRESS)) {
4170 ret = 1;
4171 break;
4172 }
4173 }
5c578aed 4174 rcu_read_unlock_bh();
3b9f9a1c
NT		 4175 return ret;
4176}
4177#endif
4178
1da177e4
LT		 4179/*
4180 * Periodic address status verification
4181 */
4182
c15b1cca 4183static void addrconf_verify_rtnl(void)
1da177e4 4184{
b2db7564 4185 unsigned long now, next, next_sec, next_sched;
1da177e4 4186 struct inet6_ifaddr *ifp;
1da177e4
LT		 4187 int i;
4188
c15b1cca
HFS		 4189 ASSERT_RTNL();
4190
5c578aed 4191 rcu_read_lock_bh();
1da177e4 4192 now = jiffies;
b2db7564 4193 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4194
c15b1cca 4195 cancel_delayed_work(&addr_chk_work);
1da177e4 4196
bcdd553f 4197 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4198restart:
c15b1cca 4199 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 4200 unsigned long age;
1da177e4 4201
fad8da3e
YA		 4202 /* When setting preferred_lft to a value not zero or
4203 * infinity, while valid_lft is infinity
4204 * IFA_F_PERMANENT has a non-infinity life time.
4205 */
4206 if ((ifp->flags & IFA_F_PERMANENT) &&
4207 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4208 continue;
4209
4210 spin_lock(&ifp->lock);
b2db7564
YH		 4211 /* We try to batch several events at once. */
4212 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4213
8f27ebb9
YH		 4214 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4215 age >= ifp->valid_lft) {
1da177e4
LT		 4216 spin_unlock(&ifp->lock);
4217 in6_ifa_hold(ifp);
1da177e4
LT		 4218 ipv6_del_addr(ifp);
4219 goto restart;
8f27ebb9
YH		 4220 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4221 spin_unlock(&ifp->lock);
4222 continue;
1da177e4 4223 } else if (age >= ifp->prefered_lft) {
a1ed0526 4224 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4225 int deprecate = 0;
4226
4227 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4228 deprecate = 1;
4229 ifp->flags |= IFA_F_DEPRECATED;
4230 }
4231
fad8da3e
YA		 4232 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4233 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4234 next = ifp->tstamp + ifp->valid_lft * HZ;
4235
4236 spin_unlock(&ifp->lock);
4237
4238 if (deprecate) {
4239 in6_ifa_hold(ifp);
1da177e4
LT		 4240
4241 ipv6_ifa_notify(0, ifp);
4242 in6_ifa_put(ifp);
4243 goto restart;
4244 }
1da177e4
LT		 4245 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4246 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4247 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4248 ifp->idev->cnf.dad_transmits *
1f9248e5 4249 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 4250
1da177e4
LT		 4251 if (age >= ifp->prefered_lft - regen_advance) {
4252 struct inet6_ifaddr *ifpub = ifp->ifpub;
4253 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4254 next = ifp->tstamp + ifp->prefered_lft * HZ;
4255 if (!ifp->regen_count && ifpub) {
4256 ifp->regen_count++;
4257 in6_ifa_hold(ifp);
4258 in6_ifa_hold(ifpub);
4259 spin_unlock(&ifp->lock);
5c578aed 4260
291d809b
HY		 4261 spin_lock(&ifpub->lock);
4262 ifpub->regen_count = 0;
4263 spin_unlock(&ifpub->lock);
1da177e4
LT		 4264 ipv6_create_tempaddr(ifpub, ifp);
4265 in6_ifa_put(ifpub);
4266 in6_ifa_put(ifp);
4267 goto restart;
4268 }
4269 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4270 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4271 spin_unlock(&ifp->lock);
1da177e4
LT		 4272 } else {
4273 /* ifp->prefered_lft <= ifp->valid_lft */
4274 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4275 next = ifp->tstamp + ifp->prefered_lft * HZ;
4276 spin_unlock(&ifp->lock);
4277 }
4278 }
1da177e4
LT		 4279 }
4280
b2db7564
YH		 4281 next_sec = round_jiffies_up(next);
4282 next_sched = next;
4283
4284 /* If rounded timeout is accurate enough, accept it. */
4285 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4286 next_sched = next_sec;
4287
4288 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4289 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4290 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4291
ba3542e1 4292 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4293 now, next, next_sec, next_sched);
c15b1cca 4294 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4295 rcu_read_unlock_bh();
1da177e4
LT		 4296}
4297
c15b1cca
HFS		 4298static void addrconf_verify_work(struct work_struct *w)
4299{
4300 rtnl_lock();
4301 addrconf_verify_rtnl();
4302 rtnl_unlock();
4303}
4304
4305static void addrconf_verify(void)
4306{
4307 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4308}
4309
caeaba79
ND		 4310static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4311 struct in6_addr **peer_pfx)
461d8837
TG		 4312{
4313 struct in6_addr *pfx = NULL;
4314
caeaba79
ND		 4315 *peer_pfx = NULL;
4316
461d8837
TG		 4317 if (addr)
4318 pfx = nla_data(addr);
4319
4320 if (local) {
4321 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4322 *peer_pfx = pfx;
4323 pfx = nla_data(local);
461d8837
TG		 4324 }
4325
4326 return pfx;
4327}
4328
ef7c79ed 4329static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4330 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4331 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4332 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4333 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 4334};
4335
1da177e4 4336static int
661d2967 4337inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4338{
3b1e0a65 4339 struct net *net = sock_net(skb->sk);
b933f716
TG		 4340 struct ifaddrmsg *ifm;
4341 struct nlattr *tb[IFA_MAX+1];
caeaba79 4342 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4343 u32 ifa_flags;
b933f716 4344 int err;
1da177e4 4345
b933f716
TG		 4346 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4347 if (err < 0)
4348 return err;
4349
4350 ifm = nlmsg_data(nlh);
caeaba79 4351 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4352 if (!pfx)
1da177e4
LT		 4353 return -EINVAL;
4354
6046d5b4
HK		 4355 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4356
4357 /* We ignore other flags so far. */
4358 ifa_flags &= IFA_F_MANAGETEMPADDR;
4359
4360 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4361 ifm->ifa_prefixlen);
1da177e4
LT		 4362}
4363
479840ff 4364static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 4365 u32 prefered_lft, u32 valid_lft)
081bba5b 4366{
6f704992
YH		 4367 u32 flags;
4368 clock_t expires;
4bed72e4 4369 unsigned long timeout;
53bd6749 4370 bool was_managetempaddr;
5b84efec 4371 bool had_prefixroute;
46d48046 4372
c15b1cca
HFS		 4373 ASSERT_RTNL();
4374
081bba5b
NT		 4375 if (!valid_lft || (prefered_lft > valid_lft))
4376 return -EINVAL;
4377
53bd6749
JP		 4378 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4379 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4380 return -EINVAL;
4381
4bed72e4
YH		 4382 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4383 if (addrconf_finite_timeout(timeout)) {
4384 expires = jiffies_to_clock_t(timeout * HZ);
4385 valid_lft = timeout;
6f704992 4386 flags = RTF_EXPIRES;
4bed72e4
YH		 4387 } else {
4388 expires = 0;
4389 flags = 0;
4390 ifa_flags |= IFA_F_PERMANENT;
6f704992 4391 }
081bba5b 4392
4bed72e4
YH		 4393 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4394 if (addrconf_finite_timeout(timeout)) {
4395 if (timeout == 0)
4396 ifa_flags |= IFA_F_DEPRECATED;
4397 prefered_lft = timeout;
4398 }
081bba5b
NT		 4399
4400 spin_lock_bh(&ifp->lock);
53bd6749 4401 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4402 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4403 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4404 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4405 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4406 IFA_F_NOPREFIXROUTE);
53bd6749 4407 ifp->flags |= ifa_flags;
081bba5b
NT		 4408 ifp->tstamp = jiffies;
4409 ifp->valid_lft = valid_lft;
4410 ifp->prefered_lft = prefered_lft;
4411
4412 spin_unlock_bh(&ifp->lock);
4413 if (!(ifp->flags&IFA_F_TENTATIVE))
4414 ipv6_ifa_notify(0, ifp);
081bba5b 4415
761aac73
TH		 4416 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4417 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4418 expires, flags);
5b84efec
TH		 4419 } else if (had_prefixroute) {
4420 enum cleanup_prefix_rt_t action;
4421 unsigned long rt_expires;
4422
4423 write_lock_bh(&ifp->idev->lock);
4424 action = check_cleanup_prefix_route(ifp, &rt_expires);
4425 write_unlock_bh(&ifp->idev->lock);
4426
4427 if (action != CLEANUP_PREFIX_RT_NOP) {
4428 cleanup_prefix_route(ifp, rt_expires,
4429 action == CLEANUP_PREFIX_RT_DEL);
4430 }
761aac73 4431 }
53bd6749
JP		 4432
4433 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4434 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4435 valid_lft = prefered_lft = 0;
4436 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4437 !was_managetempaddr, jiffies);
4438 }
4439
c15b1cca 4440 addrconf_verify_rtnl();
081bba5b
NT		 4441
4442 return 0;
4443}
4444
1da177e4 4445static int
661d2967 4446inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4447{
3b1e0a65 4448 struct net *net = sock_net(skb->sk);
461d8837
TG		 4449 struct ifaddrmsg *ifm;
4450 struct nlattr *tb[IFA_MAX+1];
caeaba79 4451 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 4452 struct inet6_ifaddr *ifa;
4453 struct net_device *dev;
55ebaef1 4454 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 4455 u32 ifa_flags;
461d8837 4456 int err;
1da177e4 4457
461d8837
TG		 4458 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4459 if (err < 0)
4460 return err;
4461
4462 ifm = nlmsg_data(nlh);
caeaba79 4463 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4464 if (!pfx)
1da177e4
LT		 4465 return -EINVAL;
4466
461d8837 4467 if (tb[IFA_CACHEINFO]) {
0778769d 4468 struct ifa_cacheinfo *ci;
461d8837
TG		 4469
4470 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 4471 valid_lft = ci->ifa_valid;
461d8837
TG		 4472 preferred_lft = ci->ifa_prefered;
4473 } else {
4474 preferred_lft = INFINITY_LIFE_TIME;
4475 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 4476 }
4477
af284937 4478 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4479 if (!dev)
7198f8ce
TG		 4480 return -ENODEV;
4481
479840ff
JP		 4482 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4483
55ebaef1 4484 /* We ignore other flags so far. */
761aac73 4485 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
93a714d6 4486 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
55ebaef1 4487
1cab3da6 4488 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
63159f29 4489 if (!ifa) {
7198f8ce
TG		 4490 /*
4491 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4492 * userspace already relies on not having to provide this.
7198f8ce 4493 */
caeaba79 4494 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 4495 ifm->ifa_prefixlen, ifa_flags,
4496 preferred_lft, valid_lft);
081bba5b
NT		 4497 }
4498
7198f8ce
TG		 4499 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4500 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4501 err = -EEXIST;
4502 else
55ebaef1 4503 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 4504
4505 in6_ifa_put(ifa);
4506
4507 return err;
1da177e4
LT		 4508}
4509
479840ff 4510static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4511 u8 scope, int ifindex)
4512{
4513 struct ifaddrmsg *ifm;
4514
4515 ifm = nlmsg_data(nlh);
4516 ifm->ifa_family = AF_INET6;
4517 ifm->ifa_prefixlen = prefixlen;
4518 ifm->ifa_flags = flags;
4519 ifm->ifa_scope = scope;
4520 ifm->ifa_index = ifindex;
4521}
4522
85486af0
TG		 4523static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4524 unsigned long tstamp, u32 preferred, u32 valid)
4525{
4526 struct ifa_cacheinfo ci;
4527
18a31e1e
TG		 4528 ci.cstamp = cstamp_delta(cstamp);
4529 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4530 ci.ifa_prefered = preferred;
4531 ci.ifa_valid = valid;
4532
4533 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4534}
4535
101bb229
TG		 4536static inline int rt_scope(int ifa_scope)
4537{
4538 if (ifa_scope & IFA_HOST)
4539 return RT_SCOPE_HOST;
4540 else if (ifa_scope & IFA_LINK)
4541 return RT_SCOPE_LINK;
4542 else if (ifa_scope & IFA_SITE)
4543 return RT_SCOPE_SITE;
4544 else
4545 return RT_SCOPE_UNIVERSE;
4546}
4547
0ab6803b
TG		 4548static inline int inet6_ifaddr_msgsize(void)
4549{
339bf98f 4550 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4551 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4552 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4553 + nla_total_size(sizeof(struct ifa_cacheinfo))
4554 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4555}
c5396a31 4556
1da177e4 4557static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4558 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4559{
1da177e4 4560 struct nlmsghdr *nlh;
85486af0 4561 u32 preferred, valid;
1da177e4 4562
15e47304 4563 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4564 if (!nlh)
26932566 4565 return -EMSGSIZE;
0ab6803b 4566
101bb229
TG		 4567 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4568 ifa->idev->dev->ifindex);
4569
fad8da3e
YA		 4570 if (!((ifa->flags&IFA_F_PERMANENT) &&
4571 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4572 preferred = ifa->prefered_lft;
4573 valid = ifa->valid_lft;
4574 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4575 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4576 if (preferred > tval)
4577 preferred -= tval;
4578 else
4579 preferred = 0;
f56619fc
BH		 4580 if (valid != INFINITY_LIFE_TIME) {
4581 if (valid > tval)
4582 valid -= tval;
4583 else
4584 valid = 0;
4585 }
1da177e4
LT		 4586 }
4587 } else {
85486af0
TG		 4588 preferred = INFINITY_LIFE_TIME;
4589 valid = INFINITY_LIFE_TIME;
4590 }
4591
7996c799 4592 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4593 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4594 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4595 goto error;
4596 } else
930345ea 4597 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4598 goto error;
4599
4600 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4601 goto error;
1da177e4 4602
479840ff
JP		 4603 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4604 goto error;
4605
053c095a
JB		 4606 nlmsg_end(skb, nlh);
4607 return 0;
caeaba79
ND		 4608
4609error:
4610 nlmsg_cancel(skb, nlh);
4611 return -EMSGSIZE;
1da177e4
LT		 4612}
4613
4614static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4615 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4616{
1da177e4 4617 struct nlmsghdr *nlh;
101bb229
TG		 4618 u8 scope = RT_SCOPE_UNIVERSE;
4619 int ifindex = ifmca->idev->dev->ifindex;
4620
4621 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4622 scope = RT_SCOPE_SITE;
1da177e4 4623
15e47304 4624 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4625 if (!nlh)
26932566 4626 return -EMSGSIZE;
85486af0 4627
0ab6803b 4628 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4629 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4630 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4631 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4632 nlmsg_cancel(skb, nlh);
4633 return -EMSGSIZE;
4634 }
85486af0 4635
053c095a
JB		 4636 nlmsg_end(skb, nlh);
4637 return 0;
1da177e4
LT		 4638}
4639
4640static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4641 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4642{
1da177e4 4643 struct nlmsghdr *nlh;
101bb229
TG		 4644 u8 scope = RT_SCOPE_UNIVERSE;
4645 int ifindex = ifaca->aca_idev->dev->ifindex;
4646
4647 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4648 scope = RT_SCOPE_SITE;
1da177e4 4649
15e47304 4650 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4651 if (!nlh)
26932566 4652 return -EMSGSIZE;
85486af0 4653
0ab6803b 4654 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4655 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4656 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4657 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4658 nlmsg_cancel(skb, nlh);
4659 return -EMSGSIZE;
4660 }
1da177e4 4661
053c095a
JB		 4662 nlmsg_end(skb, nlh);
4663 return 0;
1da177e4
LT		 4664}
4665
e21e8467 4666enum addr_type_t {
1da177e4
LT		 4667 UNICAST_ADDR,
4668 MULTICAST_ADDR,
4669 ANYCAST_ADDR,
4670};
4671
234b27c3
ED		 4672/* called with rcu_read_lock() */
4673static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4674 struct netlink_callback *cb, enum addr_type_t type,
4675 int s_ip_idx, int *p_ip_idx)
4676{
234b27c3
ED		 4677 struct ifmcaddr6 *ifmca;
4678 struct ifacaddr6 *ifaca;
4679 int err = 1;
4680 int ip_idx = *p_ip_idx;
4681
4682 read_lock_bh(&idev->lock);
4683 switch (type) {
502a2ffd 4684 case UNICAST_ADDR: {
4685 struct inet6_ifaddr *ifa;
4686
234b27c3 4687 /* unicast address incl. temp addr */
502a2ffd 4688 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4689 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4690 continue;
4691 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4692 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4693 cb->nlh->nlmsg_seq,
4694 RTM_NEWADDR,
4695 NLM_F_MULTI);
053c095a 4696 if (err < 0)
234b27c3 4697 break;
63998ac2 4698 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4699 }
4700 break;
502a2ffd 4701 }
234b27c3
ED		 4702 case MULTICAST_ADDR:
4703 /* multicast address */
4704 for (ifmca = idev->mc_list; ifmca;
4705 ifmca = ifmca->next, ip_idx++) {
4706 if (ip_idx < s_ip_idx)
4707 continue;
4708 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4709 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4710 cb->nlh->nlmsg_seq,
4711 RTM_GETMULTICAST,
4712 NLM_F_MULTI);
053c095a 4713 if (err < 0)
234b27c3
ED		 4714 break;
4715 }
4716 break;
4717 case ANYCAST_ADDR:
4718 /* anycast address */
4719 for (ifaca = idev->ac_list; ifaca;
4720 ifaca = ifaca->aca_next, ip_idx++) {
4721 if (ip_idx < s_ip_idx)
4722 continue;
4723 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4724 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4725 cb->nlh->nlmsg_seq,
4726 RTM_GETANYCAST,
4727 NLM_F_MULTI);
053c095a 4728 if (err < 0)
234b27c3
ED		 4729 break;
4730 }
4731 break;
4732 default:
4733 break;
4734 }
4735 read_unlock_bh(&idev->lock);
4736 *p_ip_idx = ip_idx;
4737 return err;
4738}
4739
1da177e4
LT		 4740static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4741 enum addr_type_t type)
4742{
234b27c3
ED		 4743 struct net *net = sock_net(skb->sk);
4744 int h, s_h;
1da177e4
LT		 4745 int idx, ip_idx;
4746 int s_idx, s_ip_idx;
1da177e4 4747 struct net_device *dev;
234b27c3
ED		 4748 struct inet6_dev *idev;
4749 struct hlist_head *head;
1ab1457c 4750
234b27c3
ED		 4751 s_h = cb->args[0];
4752 s_idx = idx = cb->args[1];
4753 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4754
234b27c3 4755 rcu_read_lock();
63998ac2 4756 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4757 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4758 idx = 0;
4759 head = &net->dev_index_head[h];
b67bfe0d 4760 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4761 if (idx < s_idx)
4762 goto cont;
4b97efdf 4763 if (h > s_h || idx > s_idx)
234b27c3
ED		 4764 s_ip_idx = 0;
4765 ip_idx = 0;
e21e8467
SH		 4766 idev = __in6_dev_get(dev);
4767 if (!idev)
234b27c3
ED		 4768 goto cont;
4769
4770 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4771 s_ip_idx, &ip_idx) < 0)
234b27c3 4772 goto done;
7562f876 4773cont:
234b27c3
ED		 4774 idx++;
4775 }
1da177e4 4776 }
234b27c3
ED		 4777done:
4778 rcu_read_unlock();
4779 cb->args[0] = h;
4780 cb->args[1] = idx;
4781 cb->args[2] = ip_idx;
4782
1da177e4
LT		 4783 return skb->len;
4784}
4785
4786static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4787{
4788 enum addr_type_t type = UNICAST_ADDR;
b854272b 4789
1da177e4
LT		 4790 return inet6_dump_addr(skb, cb, type);
4791}
4792
4793static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4794{
4795 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4796
1da177e4
LT		 4797 return inet6_dump_addr(skb, cb, type);
4798}
4799
4800
4801static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4802{
4803 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4804
1da177e4
LT		 4805 return inet6_dump_addr(skb, cb, type);
4806}
4807
661d2967 4808static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4809{
3b1e0a65 4810 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4811 struct ifaddrmsg *ifm;
4812 struct nlattr *tb[IFA_MAX+1];
caeaba79 4813 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4814 struct net_device *dev = NULL;
4815 struct inet6_ifaddr *ifa;
4816 struct sk_buff *skb;
6c223828
NT		 4817 int err;
4818
1b29fc2c
TG		 4819 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4820 if (err < 0)
4821 goto errout;
4822
caeaba79 4823 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
63159f29 4824 if (!addr) {
1b29fc2c
TG		 4825 err = -EINVAL;
4826 goto errout;
6c223828 4827 }
6c223828 4828
1b29fc2c 4829 ifm = nlmsg_data(nlh);
6c223828 4830 if (ifm->ifa_index)
6fda7350 4831 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4832
e21e8467
SH		 4833 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4834 if (!ifa) {
1b29fc2c
TG		 4835 err = -EADDRNOTAVAIL;
4836 goto errout;
4837 }
6c223828 4838
e21e8467
SH		 4839 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4840 if (!skb) {
6c223828 4841 err = -ENOBUFS;
1b29fc2c 4842 goto errout_ifa;
6c223828
NT		 4843 }
4844
15e47304 4845 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4846 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4847 if (err < 0) {
4848 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4849 WARN_ON(err == -EMSGSIZE);
4850 kfree_skb(skb);
4851 goto errout_ifa;
4852 }
15e47304 4853 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4854errout_ifa:
6c223828 4855 in6_ifa_put(ifa);
1b29fc2c 4856errout:
6c223828 4857 return err;
6c223828
NT		 4858}
4859
1da177e4
LT		 4860static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4861{
4862 struct sk_buff *skb;
c346dca1 4863 struct net *net = dev_net(ifa->idev->dev);
5d620266 4864 int err = -ENOBUFS;
1da177e4 4865
0ab6803b 4866 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 4867 if (!skb)
5d620266
TG		 4868 goto errout;
4869
4870 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4871 if (err < 0) {
4872 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4873 WARN_ON(err == -EMSGSIZE);
4874 kfree_skb(skb);
4875 goto errout;
4876 }
1ce85fe4
PNA		 4877 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4878 return;
5d620266
TG		 4879errout:
4880 if (err < 0)
6fda7350 4881 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4882}
4883
b6f99a21 4884static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4885 __s32 *array, int bytes)
4886{
04561c1f
TG		 4887 BUG_ON(bytes < (DEVCONF_MAX * 4));
4888
1da177e4
LT		 4889 memset(array, 0, bytes);
4890 array[DEVCONF_FORWARDING] = cnf->forwarding;
4891 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4892 array[DEVCONF_MTU6] = cnf->mtu6;
4893 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4894 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4895 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4896 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4897 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4898 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4899 jiffies_to_msecs(cnf->rtr_solicit_interval);
bd11f074
MŻ		 4900 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
4901 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
93908d19
TG		 4902 array[DEVCONF_RTR_SOLICIT_DELAY] =
4903 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4904 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4905 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4906 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4907 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4908 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4909 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4910 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4911 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4912 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4913 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4914 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4915 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 4916 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 4917 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4918#ifdef CONFIG_IPV6_ROUTER_PREF
4919 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4920 array[DEVCONF_RTR_PROBE_INTERVAL] =
4921 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4922#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4923 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4924#endif
930d6ff2 4925#endif
fbea49e1 4926 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4927 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4928#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4929 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 4930 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 4931#endif
7bc570c8
YH		 4932#ifdef CONFIG_IPV6_MROUTE
4933 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4934#endif
778d80be 4935 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4936 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4937 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4938 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 4939 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 4940 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 4941 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 4942 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 4943 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 4944 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 4945 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 4946 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 4947 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1da177e4
LT		 4948}
4949
b382b191
TG		 4950static inline size_t inet6_ifla6_size(void)
4951{
4952 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4953 + nla_total_size(sizeof(struct ifla_cacheinfo))
4954 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4955 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4956 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4957 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4958}
4959
339bf98f
TG		 4960static inline size_t inet6_if_nlmsg_size(void)
4961{
4962 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4963 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4964 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4965 + nla_total_size(4) /* IFLA_MTU */
4966 + nla_total_size(4) /* IFLA_LINK */
0344338b 4967 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 4968 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4969}
c5396a31 4970
be281e55 4971static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
aca05671 4972 int bytes)
7f7d9a6b
HX		 4973{
4974 int i;
aca05671 4975 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
7f7d9a6b
HX		 4976 BUG_ON(pad < 0);
4977
4978 /* Use put_unaligned() because stats may not be aligned for u64. */
aca05671
JH		 4979 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
4980 for (i = 1; i < ICMP6_MIB_MAX; i++)
be281e55 4981 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b 4982
aca05671 4983 memset(&stats[ICMP6_MIB_MAX], 0, pad);
7f7d9a6b
HX		 4984}
4985
698365fa 4986static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 4987 int bytes, size_t syncpoff)
4ce3c183 4988{
a3a77372
R		 4989 int i, c;
4990 u64 buff[IPSTATS_MIB_MAX];
4991 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4992
4ce3c183
ED		 4993 BUG_ON(pad < 0);
4994
a3a77372
R		 4995 memset(buff, 0, sizeof(buff));
4996 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 4997
a3a77372
R		 4998 for_each_possible_cpu(c) {
4999 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5000 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5001 }
5002
5003 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5004 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 5005}
5006
7f7d9a6b
HX		 5007static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5008 int bytes)
5009{
e21e8467 5010 switch (attrtype) {
7f7d9a6b 5011 case IFLA_INET6_STATS:
a3a77372
R		 5012 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5013 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 5014 break;
5015 case IFLA_INET6_ICMP6STATS:
aca05671 5016 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
7f7d9a6b
HX		 5017 break;
5018 }
5019}
5020
d5566fd7
SV		 5021static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5022 u32 ext_filter_mask)
b382b191
TG		 5023{
5024 struct nlattr *nla;
5025 struct ifla_cacheinfo ci;
5026
c78679e8
DM		 5027 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5028 goto nla_put_failure;
b382b191 5029 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 5030 ci.tstamp = cstamp_delta(idev->tstamp);
5031 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 5032 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 5033 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5034 goto nla_put_failure;
b382b191 5035 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 5036 if (!nla)
b382b191
TG		 5037 goto nla_put_failure;
5038 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5039
5040 /* XXX - MC not implemented */
5041
d5566fd7
SV		 5042 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5043 return 0;
5044
b382b191 5045 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 5046 if (!nla)
b382b191
TG		 5047 goto nla_put_failure;
5048 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5049
5050 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 5051 if (!nla)
b382b191
TG		 5052 goto nla_put_failure;
5053 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5054
f53adae4 5055 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 5056 if (!nla)
f53adae4 5057 goto nla_put_failure;
bc91b0f0
JP		 5058
5059 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
5060 goto nla_put_failure;
5061
f53adae4
DB		 5062 read_lock_bh(&idev->lock);
5063 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5064 read_unlock_bh(&idev->lock);
5065
b382b191
TG		 5066 return 0;
5067
5068nla_put_failure:
5069 return -EMSGSIZE;
5070}
5071
b1974ed0
AR		 5072static size_t inet6_get_link_af_size(const struct net_device *dev,
5073 u32 ext_filter_mask)
b382b191
TG		 5074{
5075 if (!__in6_dev_get(dev))
5076 return 0;
5077
5078 return inet6_ifla6_size();
5079}
5080
d5566fd7
SV		 5081static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5082 u32 ext_filter_mask)
b382b191
TG		 5083{
5084 struct inet6_dev *idev = __in6_dev_get(dev);
5085
5086 if (!idev)
5087 return -ENODATA;
5088
d5566fd7 5089 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5090 return -EMSGSIZE;
5091
5092 return 0;
5093}
5094
f53adae4
DB		 5095static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5096{
f53adae4
DB		 5097 struct inet6_ifaddr *ifp;
5098 struct net_device *dev = idev->dev;
47e27d5e 5099 bool clear_token, update_rs = false;
dc848292 5100 struct in6_addr ll_addr;
f53adae4 5101
c15b1cca
HFS		 5102 ASSERT_RTNL();
5103
63159f29 5104 if (!token)
f53adae4 5105 return -EINVAL;
f53adae4
DB		 5106 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5107 return -EINVAL;
f53adae4
DB		 5108 if (!ipv6_accept_ra(idev))
5109 return -EINVAL;
bd11f074 5110 if (idev->cnf.rtr_solicits == 0)
f53adae4
DB		 5111 return -EINVAL;
5112
5113 write_lock_bh(&idev->lock);
5114
5115 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5116 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5117
5118 write_unlock_bh(&idev->lock);
5119
47e27d5e
DB		 5120 clear_token = ipv6_addr_any(token);
5121 if (clear_token)
5122 goto update_lft;
5123
dc848292
HFS		 5124 if (!idev->dead && (idev->if_flags & IF_READY) &&
5125 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5126 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5127 /* If we're not ready, then normal ifup will take care
5128 * of this. Otherwise, we need to request our rs here.
5129 */
5130 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5131 update_rs = true;
5132 }
f53adae4 5133
47e27d5e 5134update_lft:
f53adae4 5135 write_lock_bh(&idev->lock);
fc403832 5136
77ecaace 5137 if (update_rs) {
fc403832 5138 idev->if_flags |= IF_RS_SENT;
bd11f074
MŻ		 5139 idev->rs_interval = rfc3315_s14_backoff_init(
5140 idev->cnf.rtr_solicit_interval);
77ecaace 5141 idev->rs_probes = 1;
bd11f074 5142 addrconf_mod_rs_timer(idev, idev->rs_interval);
77ecaace 5143 }
f53adae4
DB		 5144
5145 /* Well, that's kinda nasty ... */
5146 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5147 spin_lock(&ifp->lock);
617fe29d 5148 if (ifp->tokenized) {
f53adae4
DB		 5149 ifp->valid_lft = 0;
5150 ifp->prefered_lft = 0;
5151 }
5152 spin_unlock(&ifp->lock);
5153 }
5154
5155 write_unlock_bh(&idev->lock);
b2ed64a9 5156 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 5157 addrconf_verify_rtnl();
f53adae4
DB		 5158 return 0;
5159}
5160
11b1f828
DB		 5161static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5162 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5163 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5164};
5165
5166static int inet6_validate_link_af(const struct net_device *dev,
5167 const struct nlattr *nla)
5168{
5169 struct nlattr *tb[IFLA_INET6_MAX + 1];
5170
5171 if (dev && !__in6_dev_get(dev))
5172 return -EAFNOSUPPORT;
5173
5174 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5175}
5176
f53adae4
DB		 5177static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5178{
5179 int err = -EINVAL;
5180 struct inet6_dev *idev = __in6_dev_get(dev);
5181 struct nlattr *tb[IFLA_INET6_MAX + 1];
5182
5183 if (!idev)
5184 return -EAFNOSUPPORT;
5185
5186 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5187 BUG();
5188
bc91b0f0 5189 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 5190 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 5191 if (err)
5192 return err;
5193 }
5194
5195 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5196 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5197
5198 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
622c81d5 5199 mode != IN6_ADDR_GEN_MODE_NONE &&
cc9da6cc
BM		 5200 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5201 mode != IN6_ADDR_GEN_MODE_RANDOM)
622c81d5
HFS		 5202 return -EINVAL;
5203
5204 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5205 !idev->cnf.stable_secret.initialized &&
5206 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
bc91b0f0 5207 return -EINVAL;
622c81d5 5208
bc91b0f0
JP		 5209 idev->addr_gen_mode = mode;
5210 err = 0;
5211 }
f53adae4
DB		 5212
5213 return err;
5214}
5215
1ab1457c 5216static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5217 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5218{
04561c1f 5219 struct net_device *dev = idev->dev;
04561c1f
TG		 5220 struct ifinfomsg *hdr;
5221 struct nlmsghdr *nlh;
5222 void *protoinfo;
04561c1f 5223
15e47304 5224 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5225 if (!nlh)
26932566 5226 return -EMSGSIZE;
04561c1f
TG		 5227
5228 hdr = nlmsg_data(nlh);
5229 hdr->ifi_family = AF_INET6;
5230 hdr->__ifi_pad = 0;
5231 hdr->ifi_type = dev->type;
5232 hdr->ifi_index = dev->ifindex;
5233 hdr->ifi_flags = dev_get_flags(dev);
5234 hdr->ifi_change = 0;
5235
c78679e8
DM		 5236 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5237 (dev->addr_len &&
5238 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5239 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5240 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5241 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5242 nla_put_u8(skb, IFLA_OPERSTATE,
5243 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5244 goto nla_put_failure;
04561c1f 5245 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 5246 if (!protoinfo)
04561c1f 5247 goto nla_put_failure;
1da177e4 5248
d5566fd7 5249 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5250 goto nla_put_failure;
1da177e4 5251
04561c1f 5252 nla_nest_end(skb, protoinfo);
053c095a
JB		 5253 nlmsg_end(skb, nlh);
5254 return 0;
1da177e4 5255
04561c1f 5256nla_put_failure:
26932566
PM		 5257 nlmsg_cancel(skb, nlh);
5258 return -EMSGSIZE;
1da177e4
LT		 5259}
5260
5261static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5262{
3b1e0a65 5263 struct net *net = sock_net(skb->sk);
84d2697d 5264 int h, s_h;
434a8a58 5265 int idx = 0, s_idx;
1da177e4
LT		 5266 struct net_device *dev;
5267 struct inet6_dev *idev;
84d2697d 5268 struct hlist_head *head;
1da177e4 5269
84d2697d
ED		 5270 s_h = cb->args[0];
5271 s_idx = cb->args[1];
5272
5273 rcu_read_lock();
5274 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5275 idx = 0;
5276 head = &net->dev_index_head[h];
b67bfe0d 5277 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5278 if (idx < s_idx)
5279 goto cont;
5280 idev = __in6_dev_get(dev);
5281 if (!idev)
5282 goto cont;
5283 if (inet6_fill_ifinfo(skb, idev,
15e47304 5284 NETLINK_CB(cb->skb).portid,
84d2697d 5285 cb->nlh->nlmsg_seq,
053c095a 5286 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5287 goto out;
7562f876 5288cont:
84d2697d
ED		 5289 idx++;
5290 }
1da177e4 5291 }
84d2697d
ED		 5292out:
5293 rcu_read_unlock();
5294 cb->args[1] = idx;
5295 cb->args[0] = h;
1da177e4
LT		 5296
5297 return skb->len;
5298}
5299
5300void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5301{
5302 struct sk_buff *skb;
c346dca1 5303 struct net *net = dev_net(idev->dev);
8d7a76c9 5304 int err = -ENOBUFS;
1ab1457c 5305
339bf98f 5306 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5307 if (!skb)
8d7a76c9
TG		 5308 goto errout;
5309
5310 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5311 if (err < 0) {
5312 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5313 WARN_ON(err == -EMSGSIZE);
5314 kfree_skb(skb);
5315 goto errout;
5316 }
5f75a104 5317 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5318 return;
8d7a76c9
TG		 5319errout:
5320 if (err < 0)
5f75a104 5321 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5322}
5323
339bf98f
TG		 5324static inline size_t inet6_prefix_nlmsg_size(void)
5325{
5326 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5327 + nla_total_size(sizeof(struct in6_addr))
5328 + nla_total_size(sizeof(struct prefix_cacheinfo));
5329}
c5396a31 5330
1da177e4 5331static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5332 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5333 int event, unsigned int flags)
1da177e4 5334{
6051e2f4
TG		 5335 struct prefixmsg *pmsg;
5336 struct nlmsghdr *nlh;
1da177e4
LT		 5337 struct prefix_cacheinfo ci;
5338
15e47304 5339 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5340 if (!nlh)
26932566 5341 return -EMSGSIZE;
6051e2f4
TG		 5342
5343 pmsg = nlmsg_data(nlh);
1da177e4 5344 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5345 pmsg->prefix_pad1 = 0;
5346 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5347 pmsg->prefix_ifindex = idev->dev->ifindex;
5348 pmsg->prefix_len = pinfo->prefix_len;
5349 pmsg->prefix_type = pinfo->type;
8a47077a 5350 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5351 pmsg->prefix_flags = 0;
5352 if (pinfo->onlink)
5353 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5354 if (pinfo->autoconf)
5355 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5356
c78679e8
DM		 5357 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5358 goto nla_put_failure;
1da177e4
LT		 5359 ci.preferred_time = ntohl(pinfo->prefered);
5360 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5361 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5362 goto nla_put_failure;
053c095a
JB		 5363 nlmsg_end(skb, nlh);
5364 return 0;
1da177e4 5365
6051e2f4 5366nla_put_failure:
26932566
PM		 5367 nlmsg_cancel(skb, nlh);
5368 return -EMSGSIZE;
1da177e4
LT		 5369}
5370
1ab1457c 5371static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5372 struct prefix_info *pinfo)
5373{
5374 struct sk_buff *skb;
c346dca1 5375 struct net *net = dev_net(idev->dev);
8c384bfa 5376 int err = -ENOBUFS;
1da177e4 5377
339bf98f 5378 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5379 if (!skb)
8c384bfa
TG		 5380 goto errout;
5381
5382 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5383 if (err < 0) {
5384 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5385 WARN_ON(err == -EMSGSIZE);
5386 kfree_skb(skb);
5387 goto errout;
5388 }
1ce85fe4
PNA		 5389 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5390 return;
8c384bfa
TG		 5391errout:
5392 if (err < 0)
6fda7350 5393 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5394}
5395
1da177e4
LT		 5396static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5397{
63998ac2
ND		 5398 struct net *net = dev_net(ifp->idev->dev);
5399
c15b1cca
HFS		 5400 if (event)
5401 ASSERT_RTNL();
5402
1da177e4
LT		 5403 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5404
5405 switch (event) {
5406 case RTM_NEWADDR:
95c385b4
NH		 5407 /*
5408 * If the address was optimistic
5409 * we inserted the route at the start of
5410 * our DAD process, so we don't need
5411 * to do it again
5412 */
5413 if (!(ifp->rt->rt6i_node))
5414 ip6_ins_rt(ifp->rt);
1da177e4
LT		 5415 if (ifp->idev->cnf.forwarding)
5416 addrconf_join_anycast(ifp);
7996c799 5417 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 5418 addrconf_prefix_route(&ifp->peer_addr, 128,
5419 ifp->idev->dev, 0, 0);
1da177e4
LT		 5420 break;
5421 case RTM_DELADDR:
5422 if (ifp->idev->cnf.forwarding)
5423 addrconf_leave_anycast(ifp);
5424 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5425 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 5426 struct rt6_info *rt;
caeaba79 5427
e7478dfc
ND		 5428 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5429 ifp->idev->dev, 0, 0);
8e3d5be7
MKL		 5430 if (rt)
5431 ip6_del_rt(rt);
caeaba79 5432 }
38bd10c4
DA		 5433 if (ifp->rt) {
5434 dst_hold(&ifp->rt->dst);
5435 ip6_del_rt(ifp->rt);
5436 }
705f1c86 5437 rt_genid_bump_ipv6(net);
1da177e4
LT		 5438 break;
5439 }
63998ac2 5440 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5441}
5442
5443static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5444{
8814c4b5 5445 rcu_read_lock_bh();
1da177e4
LT		 5446 if (likely(ifp->idev->dead == 0))
5447 __ipv6_ifa_notify(event, ifp);
8814c4b5 5448 rcu_read_unlock_bh();
1da177e4
LT		 5449}
5450
5451#ifdef CONFIG_SYSCTL
5452
5453static
fe2c6338 5454int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5455 void __user *buffer, size_t *lenp, loff_t *ppos)
5456{
5457 int *valp = ctl->data;
5458 int val = *valp;
88af182e 5459 loff_t pos = *ppos;
fe2c6338 5460 struct ctl_table lctl;
1da177e4
LT		 5461 int ret;
5462
013d97e9
FR		 5463 /*
5464 * ctl->data points to idev->cnf.forwarding, we should
5465 * not modify it until we get the rtnl lock.
5466 */
5467 lctl = *ctl;
5468 lctl.data = &val;
5469
5470 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5471
c8fecf22 5472 if (write)
b325fddb 5473 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5474 if (ret)
5475 *ppos = pos;
1ab1457c 5476 return ret;
1da177e4
LT		 5477}
5478
77751427
ML		 5479static
5480int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5481 void __user *buffer, size_t *lenp, loff_t *ppos)
5482{
5483 struct inet6_dev *idev = ctl->extra1;
5484 int min_mtu = IPV6_MIN_MTU;
5485 struct ctl_table lctl;
5486
5487 lctl = *ctl;
5488 lctl.extra1 = &min_mtu;
5489 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5490
5491 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5492}
5493
56d417b1
BH		 5494static void dev_disable_change(struct inet6_dev *idev)
5495{
75538c2b
CW		 5496 struct netdev_notifier_info info;
5497
56d417b1
BH		 5498 if (!idev || !idev->dev)
5499 return;
5500
75538c2b 5501 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5502 if (idev->cnf.disable_ipv6)
75538c2b 5503 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5504 else
75538c2b 5505 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5506}
5507
5508static void addrconf_disable_change(struct net *net, __s32 newf)
5509{
5510 struct net_device *dev;
5511 struct inet6_dev *idev;
5512
c6d14c84
ED		 5513 rcu_read_lock();
5514 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 5515 idev = __in6_dev_get(dev);
5516 if (idev) {
5517 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5518 idev->cnf.disable_ipv6 = newf;
5519 if (changed)
5520 dev_disable_change(idev);
5521 }
56d417b1 5522 }
c6d14c84 5523 rcu_read_unlock();
56d417b1
BH		 5524}
5525
013d97e9 5526static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5527{
5528 struct net *net;
013d97e9
FR		 5529 int old;
5530
5531 if (!rtnl_trylock())
5532 return restart_syscall();
56d417b1
BH		 5533
5534 net = (struct net *)table->extra2;
013d97e9
FR		 5535 old = *p;
5536 *p = newf;
56d417b1 5537
013d97e9
FR		 5538 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5539 rtnl_unlock();
56d417b1 5540 return 0;
88af182e 5541 }
56d417b1
BH		 5542
5543 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5544 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5545 addrconf_disable_change(net, newf);
013d97e9 5546 } else if ((!newf) ^ (!old))
56d417b1
BH		 5547 dev_disable_change((struct inet6_dev *)table->extra1);
5548
5549 rtnl_unlock();
5550 return 0;
5551}
5552
5553static
fe2c6338 5554int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5555 void __user *buffer, size_t *lenp, loff_t *ppos)
5556{
5557 int *valp = ctl->data;
5558 int val = *valp;
88af182e 5559 loff_t pos = *ppos;
fe2c6338 5560 struct ctl_table lctl;
56d417b1
BH		 5561 int ret;
5562
013d97e9
FR		 5563 /*
5564 * ctl->data points to idev->cnf.disable_ipv6, we should
5565 * not modify it until we get the rtnl lock.
5566 */
5567 lctl = *ctl;
5568 lctl.data = &val;
5569
5570 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5571
5572 if (write)
5573 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5574 if (ret)
5575 *ppos = pos;
56d417b1
BH		 5576 return ret;
5577}
5578
c92d5491 5579static
5580int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5581 void __user *buffer, size_t *lenp, loff_t *ppos)
5582{
5583 int *valp = ctl->data;
5584 int ret;
5585 int old, new;
5586
5587 old = *valp;
5588 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5589 new = *valp;
5590
5591 if (write && old != new) {
5592 struct net *net = ctl->extra2;
5593
5594 if (!rtnl_trylock())
5595 return restart_syscall();
5596
5597 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5598 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5599 NETCONFA_IFINDEX_DEFAULT,
5600 net->ipv6.devconf_dflt);
5601 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5602 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5603 NETCONFA_IFINDEX_ALL,
5604 net->ipv6.devconf_all);
5605 else {
5606 struct inet6_dev *idev = ctl->extra1;
5607
5608 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5609 idev->dev->ifindex,
5610 &idev->cnf);
5611 }
5612 rtnl_unlock();
5613 }
5614
5615 return ret;
5616}
5617
3d1bec99
HFS		 5618static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5619 void __user *buffer, size_t *lenp,
5620 loff_t *ppos)
5621{
5622 int err;
5623 struct in6_addr addr;
5624 char str[IPV6_MAX_STRLEN];
5625 struct ctl_table lctl = *ctl;
622c81d5 5626 struct net *net = ctl->extra2;
3d1bec99
HFS		 5627 struct ipv6_stable_secret *secret = ctl->data;
5628
622c81d5
HFS		 5629 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5630 return -EIO;
5631
3d1bec99
HFS		 5632 lctl.maxlen = IPV6_MAX_STRLEN;
5633 lctl.data = str;
5634
5635 if (!rtnl_trylock())
5636 return restart_syscall();
5637
5638 if (!write && !secret->initialized) {
5639 err = -EIO;
5640 goto out;
5641 }
5642
5449a5ca
WC		 5643 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5644 if (err >= sizeof(str)) {
5645 err = -EIO;
5646 goto out;
3d1bec99
HFS		 5647 }
5648
5649 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5650 if (err || !write)
5651 goto out;
5652
5653 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5654 err = -EIO;
5655 goto out;
5656 }
5657
5658 secret->initialized = true;
5659 secret->secret = addr;
5660
622c81d5
HFS		 5661 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5662 struct net_device *dev;
5663
5664 for_each_netdev(net, dev) {
5665 struct inet6_dev *idev = __in6_dev_get(dev);
5666
5667 if (idev) {
5668 idev->addr_gen_mode =
5669 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5670 }
5671 }
5672 } else {
5673 struct inet6_dev *idev = ctl->extra1;
5674
5675 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5676 }
5677
3d1bec99
HFS		 5678out:
5679 rtnl_unlock();
5680
5681 return err;
5682}
c92d5491 5683
35103d11
AG		 5684static
5685int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5686 int write,
5687 void __user *buffer,
5688 size_t *lenp,
5689 loff_t *ppos)
5690{
5691 int *valp = ctl->data;
5692 int val = *valp;
5693 loff_t pos = *ppos;
5694 struct ctl_table lctl;
5695 int ret;
5696
5697 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5698 * we should not modify it until we get the rtnl lock.
5699 */
5700 lctl = *ctl;
5701 lctl.data = &val;
5702
5703 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5704
5705 if (write)
5706 ret = addrconf_fixup_linkdown(ctl, valp, val);
5707 if (ret)
5708 *ppos = pos;
5709 return ret;
5710}
5711
cb4a4c69 5712static int minus_one = -1;
cb9e684e
MŻ		 5713static const int one = 1;
5714static const int two_five_five = 255;
5715
607ea7cd 5716static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 5717 {
5718 .procname = "forwarding",
5719 .data = &ipv6_devconf.forwarding,
5720 .maxlen = sizeof(int),
5721 .mode = 0644,
5722 .proc_handler = addrconf_sysctl_forward,
5723 },
5724 {
5725 .procname = "hop_limit",
5726 .data = &ipv6_devconf.hop_limit,
5727 .maxlen = sizeof(int),
5728 .mode = 0644,
cb9e684e
MŻ		 5729 .proc_handler = proc_dointvec_minmax,
5730 .extra1 = (void *)&one,
5731 .extra2 = (void *)&two_five_five,
5df1f77f
KK		 5732 },
5733 {
5734 .procname = "mtu",
5735 .data = &ipv6_devconf.mtu6,
5736 .maxlen = sizeof(int),
5737 .mode = 0644,
5738 .proc_handler = addrconf_sysctl_mtu,
5739 },
5740 {
5741 .procname = "accept_ra",
5742 .data = &ipv6_devconf.accept_ra,
5743 .maxlen = sizeof(int),
5744 .mode = 0644,
5745 .proc_handler = proc_dointvec,
5746 },
5747 {
5748 .procname = "accept_redirects",
5749 .data = &ipv6_devconf.accept_redirects,
5750 .maxlen = sizeof(int),
5751 .mode = 0644,
5752 .proc_handler = proc_dointvec,
5753 },
5754 {
5755 .procname = "autoconf",
5756 .data = &ipv6_devconf.autoconf,
5757 .maxlen = sizeof(int),
5758 .mode = 0644,
5759 .proc_handler = proc_dointvec,
5760 },
5761 {
5762 .procname = "dad_transmits",
5763 .data = &ipv6_devconf.dad_transmits,
5764 .maxlen = sizeof(int),
5765 .mode = 0644,
5766 .proc_handler = proc_dointvec,
5767 },
5768 {
5769 .procname = "router_solicitations",
5770 .data = &ipv6_devconf.rtr_solicits,
5771 .maxlen = sizeof(int),
5772 .mode = 0644,
cb4a4c69
MŻ		 5773 .proc_handler = proc_dointvec_minmax,
5774 .extra1 = &minus_one,
5df1f77f
KK		 5775 },
5776 {
5777 .procname = "router_solicitation_interval",
5778 .data = &ipv6_devconf.rtr_solicit_interval,
5779 .maxlen = sizeof(int),
5780 .mode = 0644,
5781 .proc_handler = proc_dointvec_jiffies,
5782 },
bd11f074
MŻ		 5783 {
5784 .procname = "router_solicitation_max_interval",
5785 .data = &ipv6_devconf.rtr_solicit_max_interval,
5786 .maxlen = sizeof(int),
5787 .mode = 0644,
5788 .proc_handler = proc_dointvec_jiffies,
5789 },
5df1f77f
KK		 5790 {
5791 .procname = "router_solicitation_delay",
5792 .data = &ipv6_devconf.rtr_solicit_delay,
5793 .maxlen = sizeof(int),
5794 .mode = 0644,
5795 .proc_handler = proc_dointvec_jiffies,
5796 },
5797 {
5798 .procname = "force_mld_version",
5799 .data = &ipv6_devconf.force_mld_version,
5800 .maxlen = sizeof(int),
5801 .mode = 0644,
5802 .proc_handler = proc_dointvec,
5803 },
5804 {
5805 .procname = "mldv1_unsolicited_report_interval",
5806 .data =
5807 &ipv6_devconf.mldv1_unsolicited_report_interval,
5808 .maxlen = sizeof(int),
5809 .mode = 0644,
5810 .proc_handler = proc_dointvec_ms_jiffies,
5811 },
5812 {
5813 .procname = "mldv2_unsolicited_report_interval",
5814 .data =
5815 &ipv6_devconf.mldv2_unsolicited_report_interval,
5816 .maxlen = sizeof(int),
5817 .mode = 0644,
5818 .proc_handler = proc_dointvec_ms_jiffies,
5819 },
5820 {
5821 .procname = "use_tempaddr",
5822 .data = &ipv6_devconf.use_tempaddr,
5823 .maxlen = sizeof(int),
5824 .mode = 0644,
5825 .proc_handler = proc_dointvec,
5826 },
5827 {
5828 .procname = "temp_valid_lft",
5829 .data = &ipv6_devconf.temp_valid_lft,
5830 .maxlen = sizeof(int),
5831 .mode = 0644,
5832 .proc_handler = proc_dointvec,
5833 },
5834 {
5835 .procname = "temp_prefered_lft",
5836 .data = &ipv6_devconf.temp_prefered_lft,
5837 .maxlen = sizeof(int),
5838 .mode = 0644,
5839 .proc_handler = proc_dointvec,
5840 },
5841 {
5842 .procname = "regen_max_retry",
5843 .data = &ipv6_devconf.regen_max_retry,
5844 .maxlen = sizeof(int),
5845 .mode = 0644,
5846 .proc_handler = proc_dointvec,
5847 },
5848 {
5849 .procname = "max_desync_factor",
5850 .data = &ipv6_devconf.max_desync_factor,
5851 .maxlen = sizeof(int),
5852 .mode = 0644,
5853 .proc_handler = proc_dointvec,
5854 },
5855 {
5856 .procname = "max_addresses",
5857 .data = &ipv6_devconf.max_addresses,
5858 .maxlen = sizeof(int),
5859 .mode = 0644,
5860 .proc_handler = proc_dointvec,
5861 },
5862 {
5863 .procname = "accept_ra_defrtr",
5864 .data = &ipv6_devconf.accept_ra_defrtr,
5865 .maxlen = sizeof(int),
5866 .mode = 0644,
5867 .proc_handler = proc_dointvec,
5868 },
5869 {
5870 .procname = "accept_ra_min_hop_limit",
5871 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5872 .maxlen = sizeof(int),
5873 .mode = 0644,
5874 .proc_handler = proc_dointvec,
5875 },
5876 {
5877 .procname = "accept_ra_pinfo",
5878 .data = &ipv6_devconf.accept_ra_pinfo,
5879 .maxlen = sizeof(int),
5880 .mode = 0644,
5881 .proc_handler = proc_dointvec,
5882 },
930d6ff2 5883#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 5884 {
5885 .procname = "accept_ra_rtr_pref",
5886 .data = &ipv6_devconf.accept_ra_rtr_pref,
5887 .maxlen = sizeof(int),
5888 .mode = 0644,
5889 .proc_handler = proc_dointvec,
5890 },
5891 {
5892 .procname = "router_probe_interval",
5893 .data = &ipv6_devconf.rtr_probe_interval,
5894 .maxlen = sizeof(int),
5895 .mode = 0644,
5896 .proc_handler = proc_dointvec_jiffies,
5897 },
fa03ef38 5898#ifdef CONFIG_IPV6_ROUTE_INFO
5df1f77f
KK		 5899 {
5900 .procname = "accept_ra_rt_info_max_plen",
5901 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5902 .maxlen = sizeof(int),
5903 .mode = 0644,
5904 .proc_handler = proc_dointvec,
5905 },
09c884d4 5906#endif
930d6ff2 5907#endif
5df1f77f
KK		 5908 {
5909 .procname = "proxy_ndp",
5910 .data = &ipv6_devconf.proxy_ndp,
5911 .maxlen = sizeof(int),
5912 .mode = 0644,
5913 .proc_handler = addrconf_sysctl_proxy_ndp,
5914 },
5915 {
5916 .procname = "accept_source_route",
5917 .data = &ipv6_devconf.accept_source_route,
5918 .maxlen = sizeof(int),
5919 .mode = 0644,
5920 .proc_handler = proc_dointvec,
5921 },
95c385b4 5922#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 5923 {
5924 .procname = "optimistic_dad",
5925 .data = &ipv6_devconf.optimistic_dad,
5926 .maxlen = sizeof(int),
5927 .mode = 0644,
5928 .proc_handler = proc_dointvec,
5929 },
5930 {
5931 .procname = "use_optimistic",
5932 .data = &ipv6_devconf.use_optimistic,
5933 .maxlen = sizeof(int),
5934 .mode = 0644,
5935 .proc_handler = proc_dointvec,
5936 },
7bc570c8
YH		 5937#endif
5938#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 5939 {
5940 .procname = "mc_forwarding",
5941 .data = &ipv6_devconf.mc_forwarding,
5942 .maxlen = sizeof(int),
5943 .mode = 0444,
5944 .proc_handler = proc_dointvec,
5945 },
95c385b4 5946#endif
5df1f77f
KK		 5947 {
5948 .procname = "disable_ipv6",
5949 .data = &ipv6_devconf.disable_ipv6,
5950 .maxlen = sizeof(int),
5951 .mode = 0644,
5952 .proc_handler = addrconf_sysctl_disable,
5953 },
5954 {
5955 .procname = "accept_dad",
5956 .data = &ipv6_devconf.accept_dad,
5957 .maxlen = sizeof(int),
5958 .mode = 0644,
5959 .proc_handler = proc_dointvec,
5960 },
5961 {
5962 .procname = "force_tllao",
5963 .data = &ipv6_devconf.force_tllao,
5964 .maxlen = sizeof(int),
5965 .mode = 0644,
5966 .proc_handler = proc_dointvec
5967 },
5968 {
5969 .procname = "ndisc_notify",
5970 .data = &ipv6_devconf.ndisc_notify,
5971 .maxlen = sizeof(int),
5972 .mode = 0644,
5973 .proc_handler = proc_dointvec
5974 },
5975 {
5976 .procname = "suppress_frag_ndisc",
5977 .data = &ipv6_devconf.suppress_frag_ndisc,
5978 .maxlen = sizeof(int),
5979 .mode = 0644,
5980 .proc_handler = proc_dointvec
5981 },
5982 {
5983 .procname = "accept_ra_from_local",
5984 .data = &ipv6_devconf.accept_ra_from_local,
5985 .maxlen = sizeof(int),
5986 .mode = 0644,
5987 .proc_handler = proc_dointvec,
5988 },
5989 {
5990 .procname = "accept_ra_mtu",
5991 .data = &ipv6_devconf.accept_ra_mtu,
5992 .maxlen = sizeof(int),
5993 .mode = 0644,
5994 .proc_handler = proc_dointvec,
5995 },
5996 {
5997 .procname = "stable_secret",
5998 .data = &ipv6_devconf.stable_secret,
5999 .maxlen = IPV6_MAX_STRLEN,
6000 .mode = 0600,
6001 .proc_handler = addrconf_sysctl_stable_secret,
6002 },
6003 {
6004 .procname = "use_oif_addrs_only",
6005 .data = &ipv6_devconf.use_oif_addrs_only,
6006 .maxlen = sizeof(int),
6007 .mode = 0644,
6008 .proc_handler = proc_dointvec,
6009 },
6010 {
6011 .procname = "ignore_routes_with_linkdown",
6012 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6013 .maxlen = sizeof(int),
6014 .mode = 0644,
6015 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6016 },
6017 {
6018 .procname = "drop_unicast_in_l2_multicast",
6019 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6020 .maxlen = sizeof(int),
6021 .mode = 0644,
6022 .proc_handler = proc_dointvec,
6023 },
6024 {
6025 .procname = "drop_unsolicited_na",
6026 .data = &ipv6_devconf.drop_unsolicited_na,
6027 .maxlen = sizeof(int),
6028 .mode = 0644,
6029 .proc_handler = proc_dointvec,
6030 },
6031 {
6032 .procname = "keep_addr_on_down",
6033 .data = &ipv6_devconf.keep_addr_on_down,
6034 .maxlen = sizeof(int),
6035 .mode = 0644,
6036 .proc_handler = proc_dointvec,
6037
6038 },
6039 {
6040 /* sentinel */
6041 }
1da177e4
LT		 6042};
6043
bff16c2f 6044static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 6045 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4 6046{
29c994e3 6047 int i, ifindex;
607ea7cd 6048 struct ctl_table *table;
6105e293 6049 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 6050
607ea7cd
KK		 6051 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6052 if (!table)
f68635e6
PE		 6053 goto out;
6054
607ea7cd
KK		 6055 for (i = 0; table[i].data; i++) {
6056 table[i].data += (char *)p - (char *)&ipv6_devconf;
cb9e684e
MŻ		 6057 /* If one of these is already set, then it is not safe to
6058 * overwrite either of them: this makes proc_dointvec_minmax
6059 * usable.
6060 */
6061 if (!table[i].extra1 && !table[i].extra2) {
6062 table[i].extra1 = idev; /* embedded; no ref */
6063 table[i].extra2 = net;
6064 }
1da177e4 6065 }
1da177e4 6066
6105e293 6067 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 6068
607ea7cd
KK		 6069 p->sysctl_header = register_net_sysctl(net, path, table);
6070 if (!p->sysctl_header)
6105e293 6071 goto free;
f68635e6 6072
29c994e3
ND		 6073 if (!strcmp(dev_name, "all"))
6074 ifindex = NETCONFA_IFINDEX_ALL;
6075 else if (!strcmp(dev_name, "default"))
6076 ifindex = NETCONFA_IFINDEX_DEFAULT;
6077 else
6078 ifindex = idev->dev->ifindex;
6079 inet6_netconf_notify_devconf(net, NETCONFA_ALL, ifindex, p);
95897312 6080 return 0;
1da177e4 6081
f68635e6 6082free:
607ea7cd 6083 kfree(table);
f68635e6 6084out:
95897312 6085 return -ENOBUFS;
1da177e4
LT		 6086}
6087
408c4768
PE		 6088static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
6089{
607ea7cd 6090 struct ctl_table *table;
408c4768 6091
607ea7cd 6092 if (!p->sysctl_header)
408c4768
PE		 6093 return;
6094
607ea7cd
KK		 6095 table = p->sysctl_header->ctl_table_arg;
6096 unregister_net_sysctl_table(p->sysctl_header);
6097 p->sysctl_header = NULL;
6098 kfree(table);
408c4768
PE		 6099}
6100
a317a2f1 6101static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 6102{
a317a2f1
WC		 6103 int err;
6104
6105 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6106 return -EINVAL;
6107
6108 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6109 &ndisc_ifinfo_sysctl_change);
6110 if (err)
6111 return err;
6112 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6113 idev, &idev->cnf);
6114 if (err)
6115 neigh_sysctl_unregister(idev->nd_parms);
6116
6117 return err;
f52295a9
PE		 6118}
6119
408c4768 6120static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 6121{
408c4768
PE		 6122 __addrconf_sysctl_unregister(&idev->cnf);
6123 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 6124}
6125
6126
6127#endif
6128
2c8c1e72 6129static int __net_init addrconf_init_net(struct net *net)
e0da5a48 6130{
a79ca223 6131 int err = -ENOMEM;
e0da5a48
PE		 6132 struct ipv6_devconf *all, *dflt;
6133
a79ca223 6134 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 6135 if (!all)
a79ca223 6136 goto err_alloc_all;
e0da5a48 6137
a79ca223 6138 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 6139 if (!dflt)
a79ca223 6140 goto err_alloc_dflt;
e0da5a48 6141
a79ca223
HZ		 6142 /* these will be inherited by all namespaces */
6143 dflt->autoconf = ipv6_defaults.autoconf;
6144 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 6145
3d1bec99
HFS		 6146 dflt->stable_secret.initialized = false;
6147 all->stable_secret.initialized = false;
6148
e0da5a48
PE		 6149 net->ipv6.devconf_all = all;
6150 net->ipv6.devconf_dflt = dflt;
6151
6152#ifdef CONFIG_SYSCTL
f8572d8f 6153 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 6154 if (err < 0)
6155 goto err_reg_all;
6156
f8572d8f 6157 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 6158 if (err < 0)
6159 goto err_reg_dflt;
6160#endif
6161 return 0;
6162
6163#ifdef CONFIG_SYSCTL
6164err_reg_dflt:
6165 __addrconf_sysctl_unregister(all);
6166err_reg_all:
6167 kfree(dflt);
6168#endif
6169err_alloc_dflt:
6170 kfree(all);
6171err_alloc_all:
6172 return err;
6173}
6174
2c8c1e72 6175static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 6176{
6177#ifdef CONFIG_SYSCTL
6178 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
6179 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
6180#endif
73cf0e92 6181 kfree(net->ipv6.devconf_dflt);
6182 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 6183}
6184
6185static struct pernet_operations addrconf_ops = {
6186 .init = addrconf_init_net,
6187 .exit = addrconf_exit_net,
6188};
6189
207895fd 6190static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 6191 .family = AF_INET6,
6192 .fill_link_af = inet6_fill_link_af,
6193 .get_link_af_size = inet6_get_link_af_size,
11b1f828 6194 .validate_link_af = inet6_validate_link_af,
f53adae4 6195 .set_link_af = inet6_set_link_af,
b382b191
TG		 6196};
6197
1da177e4
LT		 6198/*
6199 * Init / cleanup code
6200 */
6201
6202int __init addrconf_init(void)
6203{
a317a2f1 6204 struct inet6_dev *idev;
c2e21293 6205 int i, err;
2a8cc6c8 6206
e21e8467
SH		 6207 err = ipv6_addr_label_init();
6208 if (err < 0) {
f3213831
JP		 6209 pr_crit("%s: cannot initialize default policy table: %d\n",
6210 __func__, err);
2cc6d2bf 6211 goto out;
2a8cc6c8 6212 }
1da177e4 6213
2cc6d2bf
NH		 6214 err = register_pernet_subsys(&addrconf_ops);
6215 if (err < 0)
6216 goto out_addrlabel;
e0da5a48 6217
c15b1cca
HFS		 6218 addrconf_wq = create_workqueue("ipv6_addrconf");
6219 if (!addrconf_wq) {
6220 err = -ENOMEM;
6221 goto out_nowq;
6222 }
6223
1da177e4
LT		 6224 /* The addrconf netdev notifier requires that loopback_dev
6225 * has it's ipv6 private information allocated and setup
6226 * before it can bring up and give link-local addresses
6227 * to other devices which are up.
6228 *
6229 * Unfortunately, loopback_dev is not necessarily the first
6230 * entry in the global dev_base list of net devices. In fact,
6231 * it is likely to be the very last entry on that list.
6232 * So this causes the notifier registry below to try and
6233 * give link-local addresses to all devices besides loopback_dev
6234 * first, then loopback_dev, which cases all the non-loopback_dev
6235 * devices to fail to get a link-local address.
6236 *
6237 * So, as a temporary fix, allocate the ipv6 structure for
6238 * loopback_dev first by hand.
6239 * Longer term, all of the dependencies ipv6 has upon the loopback
6240 * device and it being up should be removed.
6241 */
6242 rtnl_lock();
a317a2f1 6243 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 6244 rtnl_unlock();
a317a2f1
WC		 6245 if (IS_ERR(idev)) {
6246 err = PTR_ERR(idev);
e0da5a48 6247 goto errlo;
a317a2f1 6248 }
1da177e4 6249
c2e21293 6250 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6251 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6252
1da177e4
LT		 6253 register_netdevice_notifier(&ipv6_dev_notf);
6254
c15b1cca 6255 addrconf_verify();
c127ea2c 6256
3678a9d8 6257 rtnl_af_register(&inet6_ops);
b382b191 6258
c7ac8679
GR		 6259 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6260 NULL);
c127ea2c
TG		 6261 if (err < 0)
6262 goto errout;
6263
6264 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 6265 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6266 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6267 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6268 inet6_dump_ifaddr, NULL);
6269 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6270 inet6_dump_ifmcaddr, NULL);
6271 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6272 inet6_dump_ifacaddr, NULL);
76f8f6cb 6273 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 6274 inet6_netconf_dump_devconf, NULL);
c127ea2c 6275
2a8cc6c8
YH		 6276 ipv6_addr_label_rtnl_register();
6277
1da177e4 6278 return 0;
c127ea2c 6279errout:
b382b191 6280 rtnl_af_unregister(&inet6_ops);
c127ea2c 6281 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6282errlo:
c15b1cca
HFS		 6283 destroy_workqueue(addrconf_wq);
6284out_nowq:
e0da5a48 6285 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 6286out_addrlabel:
6287 ipv6_addr_label_cleanup();
6288out:
c127ea2c 6289 return err;
1da177e4
LT		 6290}
6291
09f7709f 6292void addrconf_cleanup(void)
1da177e4 6293{
176c39af 6294 struct net_device *dev;
1da177e4
LT		 6295 int i;
6296
6297 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6298 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 6299 ipv6_addr_label_cleanup();
1da177e4
LT		 6300
6301 rtnl_lock();
6302
b382b191
TG		 6303 __rtnl_af_unregister(&inet6_ops);
6304
176c39af
DL		 6305 /* clean dev list */
6306 for_each_netdev(&init_net, dev) {
6307 if (__in6_dev_get(dev) == NULL)
6308 continue;
6309 addrconf_ifdown(dev, 1);
6310 }
6311 addrconf_ifdown(init_net.loopback_dev, 2);
6312
1da177e4
LT		 6313 /*
6314 * Check hash table.
6315 */
5c578aed 6316 spin_lock_bh(&addrconf_hash_lock);
c2e21293 6317 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6318 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 6319 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 6320 cancel_delayed_work(&addr_chk_work);
1da177e4 6321 rtnl_unlock();
c15b1cca
HFS		 6322
6323 destroy_workqueue(addrconf_wq);
1da177e4 6324}
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