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ipv6: streamline addrconf_set_dstaddr
[linux-block.git] / net / ipv6 / addrconf.c
CommitLineData
2874c5fd 1// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4
LT		 2/*
3 * IPv6 Address [auto]configuration
4 * Linux INET6 implementation
5 *
6 * Authors:
1ab1457c 7 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4 8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
1da177e4
LT		 9 */
10
11/*
12 * Changes:
13 *
14 * Janos Farkas : delete timer on ifdown
15 * <chexum@bankinf.banki.hu>
16 * Andi Kleen : kill double kfree on module
17 * unload.
18 * Maciej W. Rozycki : FDDI support
19 * sekiya@USAGI : Don't send too many RS
20 * packets.
21 * yoshfuji@USAGI : Fixed interval between DAD
22 * packets.
23 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
24 * address validation timer.
25 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
26 * support.
27 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
28 * address on a same interface.
29 * YOSHIFUJI Hideaki @USAGI : ARCnet support
30 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
31 * seq_file.
b1cacb68
YH		 32 * YOSHIFUJI Hideaki @USAGI : improved source address
33 * selection; consider scope,
34 * status etc.
1da177e4
LT		 35 */
36
f3213831
JP		 37#define pr_fmt(fmt) "IPv6: " fmt
38
1da177e4
LT		 39#include <linux/errno.h>
40#include <linux/types.h>
a0bffffc 41#include <linux/kernel.h>
174cd4b1 42#include <linux/sched/signal.h>
1da177e4
LT		 43#include <linux/socket.h>
44#include <linux/sockios.h>
1da177e4 45#include <linux/net.h>
3d1bec99 46#include <linux/inet.h>
1da177e4
LT		 47#include <linux/in6.h>
48#include <linux/netdevice.h>
1823730f 49#include <linux/if_addr.h>
1da177e4
LT		 50#include <linux/if_arp.h>
51#include <linux/if_arcnet.h>
52#include <linux/if_infiniband.h>
53#include <linux/route.h>
54#include <linux/inetdevice.h>
55#include <linux/init.h>
5a0e3ad6 56#include <linux/slab.h>
1da177e4
LT		 57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
4fc268d2 60#include <linux/capability.h>
1da177e4
LT		 61#include <linux/delay.h>
62#include <linux/notifier.h>
543537bd 63#include <linux/string.h>
ddbe5032 64#include <linux/hash.h>
1da177e4 65
457c4cbc 66#include <net/net_namespace.h>
1da177e4
LT		 67#include <net/sock.h>
68#include <net/snmp.h>
69
5241c2d7 70#include <net/6lowpan.h>
cb6bf355 71#include <net/firewire.h>
1da177e4
LT		 72#include <net/ipv6.h>
73#include <net/protocol.h>
74#include <net/ndisc.h>
75#include <net/ip6_route.h>
76#include <net/addrconf.h>
77#include <net/tcp.h>
78#include <net/ip.h>
5d620266 79#include <net/netlink.h>
f24e3d65 80#include <net/pkt_sched.h>
ca254490 81#include <net/l3mdev.h>
1da177e4
LT		 82#include <linux/if_tunnel.h>
83#include <linux/rtnetlink.h>
f3a1bfb1 84#include <linux/netconf.h>
1da177e4 85#include <linux/random.h>
e21e8467 86#include <linux/uaccess.h>
7f7d9a6b 87#include <asm/unaligned.h>
1da177e4
LT		 88
89#include <linux/proc_fs.h>
90#include <linux/seq_file.h>
bc3b2d7f 91#include <linux/export.h>
1da177e4 92
1da177e4 93#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e 94
3d1bec99
HFS		 95#define IPV6_MAX_STRLEN \
96 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
97
18a31e1e
TG		 98static inline u32 cstamp_delta(unsigned long cstamp)
99{
100 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
101}
1da177e4 102
bd11f074
MŻ		 103static inline s32 rfc3315_s14_backoff_init(s32 irt)
104{
105 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
106 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
107 do_div(tmp, 1000000);
108 return (s32)tmp;
109}
110
111static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
112{
113 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
114 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
115 do_div(tmp, 1000000);
116 if ((s32)tmp > mrt) {
117 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
118 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
119 do_div(tmp, 1000000);
120 }
121 return (s32)tmp;
122}
123
1da177e4 124#ifdef CONFIG_SYSCTL
a317a2f1 125static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 126static void addrconf_sysctl_unregister(struct inet6_dev *idev);
127#else
a317a2f1 128static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 129{
a317a2f1 130 return 0;
408c4768
PE		 131}
132
133static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
134{
135}
1da177e4
LT		 136#endif
137
969c5464 138static void ipv6_gen_rnd_iid(struct in6_addr *addr);
1da177e4 139
1b34be74 140static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
d9bf82c2 141static int ipv6_count_addresses(const struct inet6_dev *idev);
622c81d5
HFS		 142static int ipv6_generate_stable_address(struct in6_addr *addr,
143 u8 dad_count,
144 const struct inet6_dev *idev);
1da177e4 145
27c565ae
ED		 146#define IN6_ADDR_HSIZE_SHIFT 8
147#define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
1da177e4
LT		 148/*
149 * Configured unicast address hash table
150 */
c2e21293 151static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 152static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 153
c15b1cca
HFS		 154static void addrconf_verify(void);
155static void addrconf_verify_rtnl(void);
156static void addrconf_verify_work(struct work_struct *);
1da177e4 157
c15b1cca
HFS		 158static struct workqueue_struct *addrconf_wq;
159static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 160
161static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
162static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
163
93d9b7d7
JP		 164static void addrconf_type_change(struct net_device *dev,
165 unsigned long event);
1da177e4
LT		 166static int addrconf_ifdown(struct net_device *dev, int how);
167
8d1c802b 168static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
21caa662
RK		 169 int plen,
170 const struct net_device *dev,
2b2450ca
DA		 171 u32 flags, u32 noflags,
172 bool no_gw);
21caa662 173
cf22f9a2 174static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 175static void addrconf_dad_work(struct work_struct *w);
c76fe2d9
DA		 176static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
177 bool send_na);
896585d4 178static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
e99e88a9 179static void addrconf_rs_timer(struct timer_list *t);
1da177e4
LT		 180static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
181static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
182
1ab1457c 183static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 184 struct prefix_info *pinfo);
1da177e4 185
888c848e 186static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 187 .forwarding = 0,
188 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
189 .mtu6 = IPV6_MIN_MTU,
190 .accept_ra = 1,
191 .accept_redirects = 1,
192 .autoconf = 1,
193 .force_mld_version = 0,
fc4eba58
HFS		 194 .mldv1_unsolicited_report_interval = 10 * HZ,
195 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 196 .dad_transmits = 1,
197 .rtr_solicits = MAX_RTR_SOLICITATIONS,
198 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 199 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 200 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 201 .use_tempaddr = 0,
1da177e4
LT		 202 .temp_valid_lft = TEMP_VALID_LIFETIME,
203 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
204 .regen_max_retry = REGEN_MAX_RETRY,
205 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 206 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 207 .accept_ra_defrtr = 1,
d9333196 208 .accept_ra_from_local = 0,
8013d1d7 209 .accept_ra_min_hop_limit= 1,
c4fd30eb 210 .accept_ra_pinfo = 1,
930d6ff2
YH		 211#ifdef CONFIG_IPV6_ROUTER_PREF
212 .accept_ra_rtr_pref = 1,
52e16356 213 .rtr_probe_interval = 60 * HZ,
09c884d4 214#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 215 .accept_ra_rt_info_min_plen = 0,
09c884d4
YH		 216 .accept_ra_rt_info_max_plen = 0,
217#endif
930d6ff2 218#endif
fbea49e1 219 .proxy_ndp = 0,
0bcbc926 220 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 221 .disable_ipv6 = 0,
09400953 222 .accept_dad = 0,
b800c3b9 223 .suppress_frag_ndisc = 1,
c2943f14 224 .accept_ra_mtu = 1,
3d1bec99
HFS		 225 .stable_secret = {
226 .initialized = false,
3985e8a3
EK		 227 },
228 .use_oif_addrs_only = 0,
35103d11 229 .ignore_routes_with_linkdown = 0,
f1705ec1 230 .keep_addr_on_down = 0,
1ababeba 231 .seg6_enabled = 0,
bf355b8d
DL		 232#ifdef CONFIG_IPV6_SEG6_HMAC
233 .seg6_require_hmac = 0,
234#endif
adc176c5 235 .enhanced_dad = 1,
d35a00b8 236 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
df789fe7 237 .disable_policy = 0,
8610c7c6 238 .rpl_seg_enabled = 0,
1da177e4
LT		 239};
240
ab32ea5d 241static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 242 .forwarding = 0,
243 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
244 .mtu6 = IPV6_MIN_MTU,
245 .accept_ra = 1,
246 .accept_redirects = 1,
247 .autoconf = 1,
fc4eba58
HFS		 248 .force_mld_version = 0,
249 .mldv1_unsolicited_report_interval = 10 * HZ,
250 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 251 .dad_transmits = 1,
252 .rtr_solicits = MAX_RTR_SOLICITATIONS,
253 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 254 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 255 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 256 .use_tempaddr = 0,
257 .temp_valid_lft = TEMP_VALID_LIFETIME,
258 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
259 .regen_max_retry = REGEN_MAX_RETRY,
260 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 261 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 262 .accept_ra_defrtr = 1,
d9333196 263 .accept_ra_from_local = 0,
8013d1d7 264 .accept_ra_min_hop_limit= 1,
c4fd30eb 265 .accept_ra_pinfo = 1,
930d6ff2
YH		 266#ifdef CONFIG_IPV6_ROUTER_PREF
267 .accept_ra_rtr_pref = 1,
52e16356 268 .rtr_probe_interval = 60 * HZ,
09c884d4 269#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 270 .accept_ra_rt_info_min_plen = 0,
09c884d4
YH		 271 .accept_ra_rt_info_max_plen = 0,
272#endif
930d6ff2 273#endif
fbea49e1 274 .proxy_ndp = 0,
0bcbc926 275 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 276 .disable_ipv6 = 0,
1b34be74 277 .accept_dad = 1,
b800c3b9 278 .suppress_frag_ndisc = 1,
c2943f14 279 .accept_ra_mtu = 1,
3d1bec99
HFS		 280 .stable_secret = {
281 .initialized = false,
282 },
3985e8a3 283 .use_oif_addrs_only = 0,
35103d11 284 .ignore_routes_with_linkdown = 0,
f1705ec1 285 .keep_addr_on_down = 0,
1ababeba 286 .seg6_enabled = 0,
bf355b8d
DL		 287#ifdef CONFIG_IPV6_SEG6_HMAC
288 .seg6_require_hmac = 0,
289#endif
adc176c5 290 .enhanced_dad = 1,
d35a00b8 291 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
df789fe7 292 .disable_policy = 0,
8610c7c6 293 .rpl_seg_enabled = 0,
1da177e4
LT		 294};
295
1f372c7b
MM		 296/* Check if link is ready: is it up and is a valid qdisc available */
297static inline bool addrconf_link_ready(const struct net_device *dev)
f24e3d65 298{
1f372c7b 299 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
f24e3d65
MC		 300}
301
b7b1bfce 302static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 303{
b7b1bfce
HFS		 304 if (del_timer(&idev->rs_timer))
305 __in6_dev_put(idev);
306}
307
c15b1cca 308static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 309{
c15b1cca 310 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 311 __in6_ifa_put(ifp);
312}
313
b7b1bfce
HFS		 314static void addrconf_mod_rs_timer(struct inet6_dev *idev,
315 unsigned long when)
316{
317 if (!timer_pending(&idev->rs_timer))
318 in6_dev_hold(idev);
319 mod_timer(&idev->rs_timer, jiffies + when);
320}
1da177e4 321
c15b1cca
HFS		 322static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
323 unsigned long delay)
1da177e4 324{
f8a894b2
XL		 325 in6_ifa_hold(ifp);
326 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
327 in6_ifa_put(ifp);
1da177e4
LT		 328}
329
7f7d9a6b
HX		 330static int snmp6_alloc_dev(struct inet6_dev *idev)
331{
827da44c
JS		 332 int i;
333
698365fa
WC		 334 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
335 if (!idev->stats.ipv6)
7f7d9a6b 336 goto err_ip;
827da44c
JS		 337
338 for_each_possible_cpu(i) {
339 struct ipstats_mib *addrconf_stats;
698365fa 340 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 341 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 342 }
343
344
be281e55
ED		 345 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
346 GFP_KERNEL);
347 if (!idev->stats.icmpv6dev)
7f7d9a6b 348 goto err_icmp;
be281e55
ED		 349 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
350 GFP_KERNEL);
351 if (!idev->stats.icmpv6msgdev)
14878f75 352 goto err_icmpmsg;
7f7d9a6b
HX		 353
354 return 0;
355
14878f75 356err_icmpmsg:
be281e55 357 kfree(idev->stats.icmpv6dev);
7f7d9a6b 358err_icmp:
698365fa 359 free_percpu(idev->stats.ipv6);
7f7d9a6b 360err_ip:
aaf70ec7 361 return -ENOMEM;
7f7d9a6b
HX		 362}
363
8e5e8f30 364static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 365{
366 struct inet6_dev *ndev;
a317a2f1 367 int err = -ENOMEM;
1da177e4
LT		 368
369 ASSERT_RTNL();
370
371 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 372 return ERR_PTR(-EINVAL);
1da177e4 373
1ab1457c 374 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
63159f29 375 if (!ndev)
a317a2f1 376 return ERR_PTR(err);
322f74a4
IO		 377
378 rwlock_init(&ndev->lock);
379 ndev->dev = dev;
502a2ffd 380 INIT_LIST_HEAD(&ndev->addr_list);
e99e88a9 381 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
c346dca1 382 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
9b29c696
HFS		 383
384 if (ndev->cnf.stable_secret.initialized)
d35a00b8 385 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
9b29c696 386
322f74a4 387 ndev->cnf.mtu6 = dev->mtu;
322f74a4 388 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
63159f29 389 if (!ndev->nd_parms) {
322f74a4 390 kfree(ndev);
a317a2f1 391 return ERR_PTR(err);
322f74a4 392 }
0187bdfb
BH		 393 if (ndev->cnf.forwarding)
394 dev_disable_lro(dev);
322f74a4
IO		 395 /* We refer to the device */
396 dev_hold(dev);
1da177e4 397
322f74a4 398 if (snmp6_alloc_dev(ndev) < 0) {
e32ac250
JP		 399 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
400 __func__);
322f74a4 401 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 402 dev_put(dev);
403 kfree(ndev);
a317a2f1 404 return ERR_PTR(err);
322f74a4 405 }
1da177e4 406
322f74a4 407 if (snmp6_register_dev(ndev) < 0) {
e32ac250
JP		 408 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
409 __func__, dev->name);
a317a2f1 410 goto err_release;
322f74a4
IO		 411 }
412
9d6280da 413 /* One reference from device. */
1be92460 414 refcount_set(&ndev->refcnt, 1);
1da177e4 415
1b34be74
YH		 416 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
417 ndev->cnf.accept_dad = -1;
418
07a93626 419#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 420 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 421 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 422 ndev->cnf.rtr_solicits = 0;
423 }
424#endif
425
372e6c8f 426 INIT_LIST_HEAD(&ndev->tempaddr_list);
76506a98 427 ndev->desync_factor = U32_MAX;
322f74a4
IO		 428 if ((dev->flags&IFF_LOOPBACK) ||
429 dev->type == ARPHRD_TUNNEL ||
9625ed72 430 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 431 dev->type == ARPHRD_SIT ||
0be669bb 432 dev->type == ARPHRD_NONE) {
322f74a4 433 ndev->cnf.use_tempaddr = -1;
969c5464 434 }
5d9efa7e 435
914faa14 436 ndev->token = in6addr_any;
1da177e4 437
1f372c7b 438 if (netif_running(dev) && addrconf_link_ready(dev))
53aadcc9
HX		 439 ndev->if_flags |= IF_READY;
440
322f74a4
IO		 441 ipv6_mc_init_dev(ndev);
442 ndev->tstamp = jiffies;
a317a2f1
WC		 443 err = addrconf_sysctl_register(ndev);
444 if (err) {
445 ipv6_mc_destroy_dev(ndev);
2a189f9e 446 snmp6_unregister_dev(ndev);
a317a2f1
WC		 447 goto err_release;
448 }
30c4cf57 449 /* protected by rtnl_lock */
cf778b00 450 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 451
2c5e8933
HFS		 452 /* Join interface-local all-node multicast group */
453 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
454
d88ae4cc 455 /* Join all-node multicast group */
f3ee4010 456 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 457
d6ddef9e 458 /* Join all-router multicast group if forwarding is set */
8b2aaede 459 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 460 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
461
1da177e4 462 return ndev;
a317a2f1
WC		 463
464err_release:
465 neigh_parms_release(&nd_tbl, ndev->nd_parms);
466 ndev->dead = 1;
467 in6_dev_finish_destroy(ndev);
468 return ERR_PTR(err);
1da177e4
LT		 469}
470
8e5e8f30 471static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 472{
473 struct inet6_dev *idev;
474
475 ASSERT_RTNL();
476
e21e8467
SH		 477 idev = __in6_dev_get(dev);
478 if (!idev) {
479 idev = ipv6_add_dev(dev);
a317a2f1 480 if (IS_ERR(idev))
db0b99f5 481 return idev;
1da177e4 482 }
c5e33bdd 483
1da177e4
LT		 484 if (dev->flags&IFF_UP)
485 ipv6_mc_up(idev);
486 return idev;
487}
488
f3a1bfb1
ND		 489static int inet6_netconf_msgsize_devconf(int type)
490{
491 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
492 + nla_total_size(4); /* NETCONFA_IFINDEX */
136ba622 493 bool all = false;
f3a1bfb1 494
136ba622
ZS		 495 if (type == NETCONFA_ALL)
496 all = true;
497
498 if (all || type == NETCONFA_FORWARDING)
f3a1bfb1 499 size += nla_total_size(4);
b1afce95 500#ifdef CONFIG_IPV6_MROUTE
136ba622 501 if (all || type == NETCONFA_MC_FORWARDING)
d67b8c61 502 size += nla_total_size(4);
b1afce95 503#endif
136ba622 504 if (all || type == NETCONFA_PROXY_NEIGH)
c92d5491 505 size += nla_total_size(4);
f3a1bfb1 506
136ba622 507 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
35103d11
AG		 508 size += nla_total_size(4);
509
f3a1bfb1
ND		 510 return size;
511}
512
513static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
514 struct ipv6_devconf *devconf, u32 portid,
515 u32 seq, int event, unsigned int flags,
516 int type)
517{
518 struct nlmsghdr *nlh;
519 struct netconfmsg *ncm;
136ba622 520 bool all = false;
f3a1bfb1
ND		 521
522 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
523 flags);
63159f29 524 if (!nlh)
f3a1bfb1
ND		 525 return -EMSGSIZE;
526
136ba622
ZS		 527 if (type == NETCONFA_ALL)
528 all = true;
529
f3a1bfb1
ND		 530 ncm = nlmsg_data(nlh);
531 ncm->ncm_family = AF_INET6;
532
533 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
534 goto nla_put_failure;
535
23452170
DA		 536 if (!devconf)
537 goto out;
538
136ba622 539 if ((all || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 540 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
541 goto nla_put_failure;
b1afce95 542#ifdef CONFIG_IPV6_MROUTE
136ba622 543 if ((all || type == NETCONFA_MC_FORWARDING) &&
d67b8c61
ND		 544 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
545 devconf->mc_forwarding) < 0)
546 goto nla_put_failure;
b1afce95 547#endif
136ba622 548 if ((all || type == NETCONFA_PROXY_NEIGH) &&
c92d5491 549 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
550 goto nla_put_failure;
551
136ba622 552 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
35103d11
AG		 553 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
554 devconf->ignore_routes_with_linkdown) < 0)
555 goto nla_put_failure;
556
23452170 557out:
053c095a
JB		 558 nlmsg_end(skb, nlh);
559 return 0;
f3a1bfb1
ND		 560
561nla_put_failure:
562 nlmsg_cancel(skb, nlh);
563 return -EMSGSIZE;
564}
565
85b3daad
DA		 566void inet6_netconf_notify_devconf(struct net *net, int event, int type,
567 int ifindex, struct ipv6_devconf *devconf)
f3a1bfb1
ND		 568{
569 struct sk_buff *skb;
570 int err = -ENOBUFS;
571
927265bc 572 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
63159f29 573 if (!skb)
f3a1bfb1
ND		 574 goto errout;
575
576 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
85b3daad 577 event, 0, type);
f3a1bfb1
ND		 578 if (err < 0) {
579 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
580 WARN_ON(err == -EMSGSIZE);
581 kfree_skb(skb);
582 goto errout;
583 }
927265bc 584 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
f3a1bfb1
ND		 585 return;
586errout:
bd779028 587 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 588}
589
76f8f6cb
ND		 590static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
591 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
592 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 593 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
35103d11 594 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
76f8f6cb
ND		 595};
596
38d51810
JK		 597static int inet6_netconf_valid_get_req(struct sk_buff *skb,
598 const struct nlmsghdr *nlh,
599 struct nlattr **tb,
600 struct netlink_ext_ack *extack)
601{
602 int i, err;
603
604 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
605 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
606 return -EINVAL;
607 }
608
609 if (!netlink_strict_get_check(skb))
8cb08174
JB		 610 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
611 tb, NETCONFA_MAX,
612 devconf_ipv6_policy, extack);
38d51810 613
8cb08174
JB		 614 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
615 tb, NETCONFA_MAX,
616 devconf_ipv6_policy, extack);
38d51810
JK		 617 if (err)
618 return err;
619
620 for (i = 0; i <= NETCONFA_MAX; i++) {
621 if (!tb[i])
622 continue;
623
624 switch (i) {
625 case NETCONFA_IFINDEX:
626 break;
627 default:
628 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
629 return -EINVAL;
630 }
631 }
632
633 return 0;
634}
635
76f8f6cb 636static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
c21ef3e3
DA		 637 struct nlmsghdr *nlh,
638 struct netlink_ext_ack *extack)
76f8f6cb
ND		 639{
640 struct net *net = sock_net(in_skb->sk);
641 struct nlattr *tb[NETCONFA_MAX+1];
4ea2607f
FW		 642 struct inet6_dev *in6_dev = NULL;
643 struct net_device *dev = NULL;
76f8f6cb
ND		 644 struct sk_buff *skb;
645 struct ipv6_devconf *devconf;
76f8f6cb
ND		 646 int ifindex;
647 int err;
648
38d51810 649 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
76f8f6cb 650 if (err < 0)
4ea2607f 651 return err;
76f8f6cb 652
76f8f6cb 653 if (!tb[NETCONFA_IFINDEX])
4ea2607f 654 return -EINVAL;
76f8f6cb 655
4ea2607f 656 err = -EINVAL;
76f8f6cb
ND		 657 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
658 switch (ifindex) {
659 case NETCONFA_IFINDEX_ALL:
660 devconf = net->ipv6.devconf_all;
661 break;
662 case NETCONFA_IFINDEX_DEFAULT:
663 devconf = net->ipv6.devconf_dflt;
664 break;
665 default:
4ea2607f 666 dev = dev_get_by_index(net, ifindex);
63159f29 667 if (!dev)
4ea2607f
FW		 668 return -EINVAL;
669 in6_dev = in6_dev_get(dev);
63159f29 670 if (!in6_dev)
76f8f6cb
ND		 671 goto errout;
672 devconf = &in6_dev->cnf;
673 break;
674 }
675
676 err = -ENOBUFS;
4ea2607f 677 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
63159f29 678 if (!skb)
76f8f6cb
ND		 679 goto errout;
680
681 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
682 NETLINK_CB(in_skb).portid,
683 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
136ba622 684 NETCONFA_ALL);
76f8f6cb
ND		 685 if (err < 0) {
686 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
687 WARN_ON(err == -EMSGSIZE);
688 kfree_skb(skb);
689 goto errout;
690 }
691 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
692errout:
4ea2607f
FW		 693 if (in6_dev)
694 in6_dev_put(in6_dev);
695 if (dev)
696 dev_put(dev);
76f8f6cb
ND		 697 return err;
698}
699
7a674200
ND		 700static int inet6_netconf_dump_devconf(struct sk_buff *skb,
701 struct netlink_callback *cb)
702{
addd383f 703 const struct nlmsghdr *nlh = cb->nlh;
7a674200
ND		 704 struct net *net = sock_net(skb->sk);
705 int h, s_h;
706 int idx, s_idx;
707 struct net_device *dev;
708 struct inet6_dev *idev;
709 struct hlist_head *head;
710
addd383f
DA		 711 if (cb->strict_check) {
712 struct netlink_ext_ack *extack = cb->extack;
713 struct netconfmsg *ncm;
714
715 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
716 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
717 return -EINVAL;
718 }
719
720 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
721 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
722 return -EINVAL;
723 }
724 }
725
7a674200
ND		 726 s_h = cb->args[0];
727 s_idx = idx = cb->args[1];
728
729 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
730 idx = 0;
731 head = &net->dev_index_head[h];
732 rcu_read_lock();
63998ac2
ND		 733 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
734 net->dev_base_seq;
7a674200
ND		 735 hlist_for_each_entry_rcu(dev, head, index_hlist) {
736 if (idx < s_idx)
737 goto cont;
738 idev = __in6_dev_get(dev);
739 if (!idev)
740 goto cont;
741
742 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
743 &idev->cnf,
744 NETLINK_CB(cb->skb).portid,
addd383f 745 nlh->nlmsg_seq,
7a674200
ND		 746 RTM_NEWNETCONF,
747 NLM_F_MULTI,
136ba622 748 NETCONFA_ALL) < 0) {
7a674200
ND		 749 rcu_read_unlock();
750 goto done;
751 }
63998ac2 752 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 753cont:
754 idx++;
755 }
756 rcu_read_unlock();
757 }
758 if (h == NETDEV_HASHENTRIES) {
759 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
760 net->ipv6.devconf_all,
761 NETLINK_CB(cb->skb).portid,
addd383f 762 nlh->nlmsg_seq,
7a674200 763 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 764 NETCONFA_ALL) < 0)
7a674200
ND		 765 goto done;
766 else
767 h++;
768 }
769 if (h == NETDEV_HASHENTRIES + 1) {
770 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
771 net->ipv6.devconf_dflt,
772 NETLINK_CB(cb->skb).portid,
addd383f 773 nlh->nlmsg_seq,
7a674200 774 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 775 NETCONFA_ALL) < 0)
7a674200
ND		 776 goto done;
777 else
778 h++;
779 }
780done:
781 cb->args[0] = h;
782 cb->args[1] = idx;
783
784 return skb->len;
785}
786
1da177e4
LT		 787#ifdef CONFIG_SYSCTL
788static void dev_forward_change(struct inet6_dev *idev)
789{
790 struct net_device *dev;
791 struct inet6_ifaddr *ifa;
1da177e4
LT		 792
793 if (!idev)
794 return;
795 dev = idev->dev;
0187bdfb
BH		 796 if (idev->cnf.forwarding)
797 dev_disable_lro(dev);
1a940835 798 if (dev->flags & IFF_MULTICAST) {
2c5e8933 799 if (idev->cnf.forwarding) {
f3ee4010 800 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 801 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
802 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
803 } else {
f3ee4010 804 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 805 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
806 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
807 }
1da177e4 808 }
502a2ffd 809
810 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 811 if (ifa->flags&IFA_F_TENTATIVE)
812 continue;
1da177e4
LT		 813 if (idev->cnf.forwarding)
814 addrconf_join_anycast(ifa);
815 else
816 addrconf_leave_anycast(ifa);
817 }
85b3daad
DA		 818 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
819 NETCONFA_FORWARDING,
f3a1bfb1 820 dev->ifindex, &idev->cnf);
1da177e4
LT		 821}
822
823
e186932b 824static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 825{
826 struct net_device *dev;
827 struct inet6_dev *idev;
828
4acd4945 829 for_each_netdev(net, dev) {
1da177e4
LT		 830 idev = __in6_dev_get(dev);
831 if (idev) {
e186932b
PE		 832 int changed = (!idev->cnf.forwarding) ^ (!newf);
833 idev->cnf.forwarding = newf;
1da177e4
LT		 834 if (changed)
835 dev_forward_change(idev);
836 }
1da177e4 837 }
1da177e4 838}
c8fecf22 839
013d97e9 840static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 841{
bff16c2f 842 struct net *net;
013d97e9
FR		 843 int old;
844
845 if (!rtnl_trylock())
846 return restart_syscall();
bff16c2f
PE		 847
848 net = (struct net *)table->extra2;
013d97e9
FR		 849 old = *p;
850 *p = newf;
b325fddb 851
013d97e9 852 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1 853 if ((!newf) ^ (!old))
85b3daad
DA		 854 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
855 NETCONFA_FORWARDING,
f3a1bfb1
ND		 856 NETCONFA_IFINDEX_DEFAULT,
857 net->ipv6.devconf_dflt);
013d97e9
FR		 858 rtnl_unlock();
859 return 0;
88af182e 860 }
c8fecf22 861
e186932b 862 if (p == &net->ipv6.devconf_all->forwarding) {
d26c638c
ND		 863 int old_dflt = net->ipv6.devconf_dflt->forwarding;
864
e186932b 865 net->ipv6.devconf_dflt->forwarding = newf;
d26c638c 866 if ((!newf) ^ (!old_dflt))
85b3daad
DA		 867 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
868 NETCONFA_FORWARDING,
d26c638c
ND		 869 NETCONFA_IFINDEX_DEFAULT,
870 net->ipv6.devconf_dflt);
871
e186932b 872 addrconf_forward_change(net, newf);
f3a1bfb1 873 if ((!newf) ^ (!old))
85b3daad
DA		 874 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
875 NETCONFA_FORWARDING,
f3a1bfb1
ND		 876 NETCONFA_IFINDEX_ALL,
877 net->ipv6.devconf_all);
013d97e9 878 } else if ((!newf) ^ (!old))
c8fecf22 879 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 880 rtnl_unlock();
c8fecf22 881
013d97e9 882 if (newf)
7b4da532 883 rt6_purge_dflt_routers(net);
b325fddb 884 return 1;
c8fecf22 885}
35103d11
AG		 886
887static void addrconf_linkdown_change(struct net *net, __s32 newf)
888{
889 struct net_device *dev;
890 struct inet6_dev *idev;
891
892 for_each_netdev(net, dev) {
893 idev = __in6_dev_get(dev);
894 if (idev) {
895 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
896
897 idev->cnf.ignore_routes_with_linkdown = newf;
898 if (changed)
899 inet6_netconf_notify_devconf(dev_net(dev),
85b3daad 900 RTM_NEWNETCONF,
35103d11
AG		 901 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
902 dev->ifindex,
903 &idev->cnf);
904 }
905 }
906}
907
908static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
909{
910 struct net *net;
911 int old;
912
913 if (!rtnl_trylock())
914 return restart_syscall();
915
916 net = (struct net *)table->extra2;
917 old = *p;
918 *p = newf;
919
920 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
921 if ((!newf) ^ (!old))
922 inet6_netconf_notify_devconf(net,
85b3daad 923 RTM_NEWNETCONF,
35103d11
AG		 924 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
925 NETCONFA_IFINDEX_DEFAULT,
926 net->ipv6.devconf_dflt);
927 rtnl_unlock();
928 return 0;
929 }
930
931 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
932 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
933 addrconf_linkdown_change(net, newf);
934 if ((!newf) ^ (!old))
935 inet6_netconf_notify_devconf(net,
85b3daad 936 RTM_NEWNETCONF,
35103d11
AG		 937 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
938 NETCONFA_IFINDEX_ALL,
939 net->ipv6.devconf_all);
940 }
941 rtnl_unlock();
942
943 return 1;
944}
945
1da177e4
LT		 946#endif
947
5c578aed 948/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 949void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
950{
c2e21293 951 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 952
1da177e4 953#ifdef NET_REFCNT_DEBUG
91df42be 954 pr_debug("%s\n", __func__);
1da177e4
LT		 955#endif
956
957 in6_dev_put(ifp->idev);
958
c15b1cca
HFS		 959 if (cancel_delayed_work(&ifp->dad_work))
960 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
961 ifp);
1da177e4 962
e9d3e084 963 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 964 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 965 return;
966 }
1da177e4 967
e5785985 968 kfree_rcu(ifp, rcu);
1da177e4
LT		 969}
970
e55ffac6
BH		 971static void
972ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
973{
502a2ffd 974 struct list_head *p;
8a6ce0c0 975 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 976
977 /*
978 * Each device address list is sorted in order of scope -
979 * global before linklocal.
980 */
502a2ffd 981 list_for_each(p, &idev->addr_list) {
982 struct inet6_ifaddr *ifa
983 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 984 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 985 break;
986 }
987
8ef802aa 988 list_add_tail_rcu(&ifp->if_list, p);
e55ffac6
BH		 989}
990
3f27fb23 991static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
3eb84f49 992{
3f27fb23
ED		 993 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
994
995 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 996}
997
56fc709b 998static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
752a9292 999 struct net_device *dev, unsigned int hash)
56fc709b 1000{
56fc709b
ED		 1001 struct inet6_ifaddr *ifp;
1002
1003 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1004 if (!net_eq(dev_net(ifp->idev->dev), net))
1005 continue;
1006 if (ipv6_addr_equal(&ifp->addr, addr)) {
1007 if (!dev || ifp->idev->dev == dev)
1008 return true;
1009 }
1010 }
1011 return false;
1012}
1013
f3d9832e
DA		 1014static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1015{
3f27fb23 1016 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
f3d9832e
DA		 1017 int err = 0;
1018
1019 spin_lock(&addrconf_hash_lock);
1020
1021 /* Ignore adding duplicate addresses on an interface */
752a9292 1022 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
e32ac250 1023 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
f3d9832e 1024 err = -EEXIST;
752a9292
ED		 1025 } else {
1026 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
f3d9832e
DA		 1027 }
1028
f3d9832e
DA		 1029 spin_unlock(&addrconf_hash_lock);
1030
1031 return err;
1032}
1033
1da177e4
LT		 1034/* On success it returns ifp with increased reference count */
1035
1036static struct inet6_ifaddr *
e6464b8c 1037ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
de95e047 1038 bool can_block, struct netlink_ext_ack *extack)
1da177e4 1039{
f3d9832e 1040 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
e6464b8c 1041 int addr_type = ipv6_addr_type(cfg->pfx);
df789fe7 1042 struct net *net = dev_net(idev->dev);
1da177e4 1043 struct inet6_ifaddr *ifa = NULL;
360a9887 1044 struct fib6_info *f6i = NULL;
1da177e4 1045 int err = 0;
d68b8270
YH		 1046
1047 if (addr_type == IPV6_ADDR_ANY ||
f17f7648
HL		 1048 (addr_type & IPV6_ADDR_MULTICAST &&
1049 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) ||
d68b8270 1050 (!(idev->dev->flags & IFF_LOOPBACK) &&
3ede0bbc 1051 !netif_is_l3_master(idev->dev) &&
d68b8270
YH		 1052 addr_type & IPV6_ADDR_LOOPBACK))
1053 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 1054
1da177e4
LT		 1055 if (idev->dead) {
1056 err = -ENODEV; /*XXX*/
f3d9832e 1057 goto out;
1da177e4
LT		 1058 }
1059
56d417b1 1060 if (idev->cnf.disable_ipv6) {
9bdd8d40 1061 err = -EACCES;
f3d9832e 1062 goto out;
9bdd8d40
BH		 1063 }
1064
ff7883ea
DA		 1065 /* validator notifier needs to be blocking;
1066 * do not call in atomic context
1067 */
1068 if (can_block) {
1069 struct in6_validator_info i6vi = {
e6464b8c 1070 .i6vi_addr = *cfg->pfx,
ff7883ea 1071 .i6vi_dev = idev,
de95e047 1072 .extack = extack,
ff7883ea
DA		 1073 };
1074
1075 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1076 err = notifier_to_errno(err);
1077 if (err < 0)
1078 goto out;
1079 }
1da177e4 1080
f3d9832e 1081 ifa = kzalloc(sizeof(*ifa), gfp_flags);
63159f29 1082 if (!ifa) {
1da177e4
LT		 1083 err = -ENOBUFS;
1084 goto out;
1085 }
1086
e6464b8c 1087 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
360a9887
DA		 1088 if (IS_ERR(f6i)) {
1089 err = PTR_ERR(f6i);
1090 f6i = NULL;
1da177e4
LT		 1091 goto out;
1092 }
1093
df789fe7
DF		 1094 if (net->ipv6.devconf_all->disable_policy ||
1095 idev->cnf.disable_policy)
360a9887 1096 f6i->dst_nopolicy = true;
df789fe7 1097
bba24896
JP		 1098 neigh_parms_data_state_setall(idev->nd_parms);
1099
e6464b8c
DA		 1100 ifa->addr = *cfg->pfx;
1101 if (cfg->peer_pfx)
1102 ifa->peer_addr = *cfg->peer_pfx;
1da177e4
LT		 1103
1104 spin_lock_init(&ifa->lock);
c15b1cca 1105 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 1106 INIT_HLIST_NODE(&ifa->addr_lst);
e6464b8c
DA		 1107 ifa->scope = cfg->scope;
1108 ifa->prefix_len = cfg->plen;
8308f3ff 1109 ifa->rt_priority = cfg->rt_priority;
e6464b8c 1110 ifa->flags = cfg->ifa_flags;
66eb9f86 1111 /* No need to add the TENTATIVE flag for addresses with NODAD */
e6464b8c 1112 if (!(cfg->ifa_flags & IFA_F_NODAD))
66eb9f86 1113 ifa->flags |= IFA_F_TENTATIVE;
e6464b8c
DA		 1114 ifa->valid_lft = cfg->valid_lft;
1115 ifa->prefered_lft = cfg->preferred_lft;
1da177e4 1116 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 1117 ifa->tokenized = false;
1da177e4 1118
360a9887 1119 ifa->rt = f6i;
57f5f544 1120
1da177e4 1121 ifa->idev = idev;
f3d9832e
DA		 1122 in6_dev_hold(idev);
1123
1da177e4 1124 /* For caller */
271201c0 1125 refcount_set(&ifa->refcnt, 1);
1da177e4 1126
f3d9832e 1127 rcu_read_lock_bh();
1da177e4 1128
f3d9832e
DA		 1129 err = ipv6_add_addr_hash(idev->dev, ifa);
1130 if (err < 0) {
1131 rcu_read_unlock_bh();
1132 goto out;
1133 }
1da177e4
LT		 1134
1135 write_lock(&idev->lock);
f3d9832e 1136
1da177e4 1137 /* Add to inet6_dev unicast addr list. */
e55ffac6 1138 ipv6_link_dev_addr(idev, ifa);
1da177e4 1139
1da177e4 1140 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 1141 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 1142 in6_ifa_hold(ifa);
1143 }
1da177e4 1144
1da177e4
LT		 1145 in6_ifa_hold(ifa);
1146 write_unlock(&idev->lock);
f3d9832e 1147
8814c4b5 1148 rcu_read_unlock_bh();
1da177e4 1149
f3d9832e
DA		 1150 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1151out:
1152 if (unlikely(err < 0)) {
360a9887 1153 fib6_info_release(f6i);
93531c67 1154
f3d9832e
DA		 1155 if (ifa) {
1156 if (ifa->idev)
1157 in6_dev_put(ifa->idev);
1158 kfree(ifa);
1159 }
1da177e4
LT		 1160 ifa = ERR_PTR(err);
1161 }
1162
1163 return ifa;
1da177e4
LT		 1164}
1165
5b84efec
TH		 1166enum cleanup_prefix_rt_t {
1167 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1168 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1169 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1170};
1171
1172/*
1173 * Check, whether the prefix for ifp would still need a prefix route
1174 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1175 * constants.
1176 *
1177 * 1) we don't purge prefix if address was not permanent.
1178 * prefix is managed by its own lifetime.
1179 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1180 * 3) if there are no addresses, delete prefix.
1181 * 4) if there are still other permanent address(es),
1182 * corresponding prefix is still permanent.
1183 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1184 * don't purge the prefix, assume user space is managing it.
1185 * 6) otherwise, update prefix lifetime to the
1186 * longest valid lifetime among the corresponding
1187 * addresses on the device.
1188 * Note: subsequent RA will update lifetime.
1189 **/
1190static enum cleanup_prefix_rt_t
1191check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1192{
1193 struct inet6_ifaddr *ifa;
1194 struct inet6_dev *idev = ifp->idev;
1195 unsigned long lifetime;
1196 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1197
1198 *expires = jiffies;
1199
1200 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1201 if (ifa == ifp)
1202 continue;
e75913c9
ZL		 1203 if (ifa->prefix_len != ifp->prefix_len ||
1204 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
5b84efec
TH		 1205 ifp->prefix_len))
1206 continue;
1207 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1208 return CLEANUP_PREFIX_RT_NOP;
1209
1210 action = CLEANUP_PREFIX_RT_EXPIRE;
1211
1212 spin_lock(&ifa->lock);
1213
1214 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1215 /*
1216 * Note: Because this address is
1217 * not permanent, lifetime <
1218 * LONG_MAX / HZ here.
1219 */
1220 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1221 *expires = ifa->tstamp + lifetime * HZ;
1222 spin_unlock(&ifa->lock);
1223 }
1224
1225 return action;
1226}
1227
1228static void
d0098e4c
HL		 1229cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1230 bool del_rt, bool del_peer)
5b84efec 1231{
93c2fb25 1232 struct fib6_info *f6i;
5b84efec 1233
d0098e4c
HL		 1234 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1235 ifp->prefix_len,
2b2450ca 1236 ifp->idev->dev, 0, RTF_DEFAULT, true);
93c2fb25 1237 if (f6i) {
5b84efec 1238 if (del_rt)
11dd74b3 1239 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
5b84efec 1240 else {
93c2fb25
DA		 1241 if (!(f6i->fib6_flags & RTF_EXPIRES))
1242 fib6_set_expires(f6i, expires);
1243 fib6_info_release(f6i);
5b84efec
TH		 1244 }
1245 }
1246}
1247
1248
1da177e4
LT		 1249/* This function wants to get referenced ifp and releases it before return */
1250
1251static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1252{
4c5ff6a6 1253 int state;
5b84efec
TH		 1254 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1255 unsigned long expires;
1da177e4 1256
c15b1cca
HFS		 1257 ASSERT_RTNL();
1258
8e8e676d 1259 spin_lock_bh(&ifp->lock);
4c5ff6a6 1260 state = ifp->state;
e9d3e084 1261 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1262 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1263
1264 if (state == INET6_IFADDR_STATE_DEAD)
1265 goto out;
1da177e4 1266
5c578aed 1267 spin_lock_bh(&addrconf_hash_lock);
1268 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1269 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1270
5b84efec 1271 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1272
1da177e4 1273 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1274 list_del(&ifp->tmp_list);
1275 if (ifp->ifpub) {
1276 in6_ifa_put(ifp->ifpub);
1277 ifp->ifpub = NULL;
1da177e4 1278 }
372e6c8f 1279 __in6_ifa_put(ifp);
1da177e4 1280 }
1da177e4 1281
5b84efec
TH		 1282 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1283 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1284
8ef802aa 1285 list_del_rcu(&ifp->if_list);
5b84efec
TH		 1286 __in6_ifa_put(ifp);
1287
1288 write_unlock_bh(&ifp->idev->lock);
1da177e4 1289
c15b1cca 1290 addrconf_del_dad_work(ifp);
b2238566 1291
1da177e4
LT		 1292 ipv6_ifa_notify(RTM_DELADDR, ifp);
1293
f88c91dd 1294 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1295
5b84efec
TH		 1296 if (action != CLEANUP_PREFIX_RT_NOP) {
1297 cleanup_prefix_route(ifp, expires,
d0098e4c 1298 action == CLEANUP_PREFIX_RT_DEL, false);
1da177e4
LT		 1299 }
1300
c3968a85
DW		 1301 /* clean up prefsrc entries */
1302 rt6_remove_prefsrc(ifp);
4c5ff6a6 1303out:
1da177e4
LT		 1304 in6_ifa_put(ifp);
1305}
1306
969c5464 1307static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
1da177e4
LT		 1308{
1309 struct inet6_dev *idev = ifp->idev;
e6464b8c 1310 unsigned long tmp_tstamp, age;
eac55bf9 1311 unsigned long regen_advance;
76f793e3 1312 unsigned long now = jiffies;
7aa8e63f 1313 s32 cnf_temp_preferred_lft;
969c5464
FG		 1314 struct inet6_ifaddr *ift;
1315 struct ifa6_config cfg;
1316 long max_desync_factor;
1317 struct in6_addr addr;
1318 int ret = 0;
1da177e4 1319
53bd6749 1320 write_lock_bh(&idev->lock);
969c5464 1321
1da177e4
LT		 1322retry:
1323 in6_dev_hold(idev);
1324 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1325 write_unlock_bh(&idev->lock);
f3213831 1326 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1327 in6_dev_put(idev);
1328 ret = -1;
1329 goto out;
1330 }
1331 spin_lock_bh(&ifp->lock);
1332 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1333 idev->cnf.use_tempaddr = -1; /*XXX*/
1334 spin_unlock_bh(&ifp->lock);
53bd6749 1335 write_unlock_bh(&idev->lock);
f3213831
JP		 1336 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1337 __func__);
1da177e4
LT		 1338 in6_dev_put(idev);
1339 ret = -1;
1340 goto out;
1341 }
1342 in6_ifa_hold(ifp);
1343 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
969c5464
FG		 1344 ipv6_gen_rnd_iid(&addr);
1345
76f793e3 1346 age = (now - ifp->tstamp) / HZ;
76506a98
JB		 1347
1348 regen_advance = idev->cnf.regen_max_retry *
1349 idev->cnf.dad_transmits *
19e16d22 1350 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
76506a98
JB		 1351
1352 /* recalculate max_desync_factor each time and update
1353 * idev->desync_factor if it's larger
1354 */
7aa8e63f 1355 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
76506a98
JB		 1356 max_desync_factor = min_t(__u32,
1357 idev->cnf.max_desync_factor,
7aa8e63f 1358 cnf_temp_preferred_lft - regen_advance);
76506a98
JB		 1359
1360 if (unlikely(idev->desync_factor > max_desync_factor)) {
1361 if (max_desync_factor > 0) {
1362 get_random_bytes(&idev->desync_factor,
1363 sizeof(idev->desync_factor));
1364 idev->desync_factor %= max_desync_factor;
1365 } else {
1366 idev->desync_factor = 0;
1367 }
1368 }
1369
3f2d67b6 1370 memset(&cfg, 0, sizeof(cfg));
e6464b8c 1371 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
7a876b0e 1372 idev->cnf.temp_valid_lft + age);
e6464b8c
DA		 1373 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1374 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1375
1376 cfg.plen = ifp->prefix_len;
1da177e4
LT		 1377 tmp_tstamp = ifp->tstamp;
1378 spin_unlock_bh(&ifp->lock);
1379
53bd6749 1380 write_unlock_bh(&idev->lock);
95c385b4 1381
eac55bf9
BB		 1382 /* A temporary address is created only if this calculated Preferred
1383 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1384 * an implementation must not create a temporary address with a zero
1385 * Preferred Lifetime.
ecab6701
HK		 1386 * Use age calculation as in addrconf_verify to avoid unnecessary
1387 * temporary addresses being generated.
eac55bf9 1388 */
ecab6701 1389 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
e6464b8c 1390 if (cfg.preferred_lft <= regen_advance + age) {
eac55bf9
BB		 1391 in6_ifa_put(ifp);
1392 in6_dev_put(idev);
1393 ret = -1;
1394 goto out;
1395 }
1396
e6464b8c 1397 cfg.ifa_flags = IFA_F_TEMPORARY;
95c385b4
NH		 1398 /* set in addrconf_prefix_rcv() */
1399 if (ifp->flags & IFA_F_OPTIMISTIC)
e6464b8c 1400 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
95c385b4 1401
e6464b8c
DA		 1402 cfg.pfx = &addr;
1403 cfg.scope = ipv6_addr_scope(cfg.pfx);
95c385b4 1404
e6464b8c 1405 ift = ipv6_add_addr(idev, &cfg, block, NULL);
4b08a8f1 1406 if (IS_ERR(ift)) {
1da177e4
LT		 1407 in6_ifa_put(ifp);
1408 in6_dev_put(idev);
f3213831 1409 pr_info("%s: retry temporary address regeneration\n", __func__);
53bd6749 1410 write_lock_bh(&idev->lock);
1da177e4
LT		 1411 goto retry;
1412 }
1413
1414 spin_lock_bh(&ift->lock);
1415 ift->ifpub = ifp;
76f793e3 1416 ift->cstamp = now;
1da177e4
LT		 1417 ift->tstamp = tmp_tstamp;
1418 spin_unlock_bh(&ift->lock);
1419
cf22f9a2 1420 addrconf_dad_start(ift);
1da177e4
LT		 1421 in6_ifa_put(ift);
1422 in6_dev_put(idev);
1423out:
1424 return ret;
1425}
1da177e4
LT		 1426
1427/*
072047e4 1428 * Choose an appropriate source address (RFC3484)
1da177e4 1429 */
a9b05723
YH		 1430enum {
1431 IPV6_SADDR_RULE_INIT = 0,
1432 IPV6_SADDR_RULE_LOCAL,
1433 IPV6_SADDR_RULE_SCOPE,
1434 IPV6_SADDR_RULE_PREFERRED,
1435#ifdef CONFIG_IPV6_MIP6
1436 IPV6_SADDR_RULE_HOA,
1437#endif
1438 IPV6_SADDR_RULE_OIF,
1439 IPV6_SADDR_RULE_LABEL,
a9b05723 1440 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1441 IPV6_SADDR_RULE_ORCHID,
1442 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1443#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1444 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1445#endif
a9b05723
YH		 1446 IPV6_SADDR_RULE_MAX
1447};
1448
072047e4 1449struct ipv6_saddr_score {
a9b05723
YH		 1450 int rule;
1451 int addr_type;
1452 struct inet6_ifaddr *ifa;
1453 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1454 int scopedist;
1455 int matchlen;
072047e4
YH		 1456};
1457
a9b05723 1458struct ipv6_saddr_dst {
9acd9f3a 1459 const struct in6_addr *addr;
a9b05723
YH		 1460 int ifindex;
1461 int scope;
1462 int label;
7cbca67c 1463 unsigned int prefs;
a9b05723 1464};
072047e4 1465
b6f99a21 1466static inline int ipv6_saddr_preferred(int type)
1da177e4 1467{
45bb0060 1468 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1469 return 1;
1470 return 0;
1da177e4
LT		 1471}
1472
35e015e1
MC		 1473static bool ipv6_use_optimistic_addr(struct net *net,
1474 struct inet6_dev *idev)
7fd2561e
EK		 1475{
1476#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 1477 if (!idev)
1478 return false;
1479 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1480 return false;
1481 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1482 return false;
1483
1484 return true;
7fd2561e
EK		 1485#else
1486 return false;
1487#endif
1488}
1489
f1c02cfb
SD		 1490static bool ipv6_allow_optimistic_dad(struct net *net,
1491 struct inet6_dev *idev)
1492{
1493#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1494 if (!idev)
1495 return false;
1496 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1497 return false;
1498
1499 return true;
1500#else
1501 return false;
1502#endif
1503}
1504
3de23255
BT		 1505static int ipv6_get_saddr_eval(struct net *net,
1506 struct ipv6_saddr_score *score,
a9b05723
YH		 1507 struct ipv6_saddr_dst *dst,
1508 int i)
1509{
1510 int ret;
1511
1512 if (i <= score->rule) {
1513 switch (i) {
1514 case IPV6_SADDR_RULE_SCOPE:
1515 ret = score->scopedist;
1516 break;
1517 case IPV6_SADDR_RULE_PREFIX:
1518 ret = score->matchlen;
1519 break;
1520 default:
1521 ret = !!test_bit(i, score->scorebits);
1522 }
1523 goto out;
1524 }
1525
1526 switch (i) {
1527 case IPV6_SADDR_RULE_INIT:
1528 /* Rule 0: remember if hiscore is not ready yet */
1529 ret = !!score->ifa;
1530 break;
1531 case IPV6_SADDR_RULE_LOCAL:
1532 /* Rule 1: Prefer same address */
1533 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1534 break;
1535 case IPV6_SADDR_RULE_SCOPE:
1536 /* Rule 2: Prefer appropriate scope
1537 *
1538 * ret
1539 * ^
1540 * -1 | d 15
1541 * ---+--+-+---> scope
1542 * |
1543 * | d is scope of the destination.
1544 * B-d | \
1545 * | \ <- smaller scope is better if
db9c7c39 1546 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1547 * | ret = B - scope (-1 <= scope >= d <= 15).
1548 * d-C-1 | /
1549 * |/ <- greater is better
1550 * -C / if scope is not enough for destination.
1551 * /| ret = scope - C (-1 <= d < scope <= 15).
1552 *
1553 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1554 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1555 * Assume B = 0 and we get C > 29.
1556 */
1557 ret = __ipv6_addr_src_scope(score->addr_type);
1558 if (ret >= dst->scope)
1559 ret = -ret;
1560 else
1561 ret -= 128; /* 30 is enough */
1562 score->scopedist = ret;
1563 break;
1564 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1565 {
a9b05723 1566 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1567 u8 avoid = IFA_F_DEPRECATED;
1568
35e015e1 1569 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
7fd2561e 1570 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1571 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1572 !(score->ifa->flags & avoid);
a9b05723 1573 break;
7fd2561e 1574 }
a9b05723
YH		 1575#ifdef CONFIG_IPV6_MIP6
1576 case IPV6_SADDR_RULE_HOA:
7cbca67c 1577 {
a9b05723 1578 /* Rule 4: Prefer home address */
7cbca67c
YH		 1579 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1580 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1581 break;
7cbca67c 1582 }
a9b05723
YH		 1583#endif
1584 case IPV6_SADDR_RULE_OIF:
1585 /* Rule 5: Prefer outgoing interface */
1586 ret = (!dst->ifindex ||
1587 dst->ifindex == score->ifa->idev->dev->ifindex);
1588 break;
1589 case IPV6_SADDR_RULE_LABEL:
1590 /* Rule 6: Prefer matching label */
3de23255
BT		 1591 ret = ipv6_addr_label(net,
1592 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1593 score->ifa->idev->dev->ifindex) == dst->label;
1594 break;
a9b05723 1595 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1596 {
a9b05723 1597 /* Rule 7: Prefer public address
25985edc 1598 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1599 */
7cbca67c
YH		 1600 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1601 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1602 score->ifa->idev->cnf.use_tempaddr >= 2;
1603 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1604 break;
7cbca67c 1605 }
a9b05723
YH		 1606 case IPV6_SADDR_RULE_ORCHID:
1607 /* Rule 8-: Prefer ORCHID vs ORCHID or
1608 * non-ORCHID vs non-ORCHID
1609 */
1610 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1611 ipv6_addr_orchid(dst->addr));
1612 break;
1613 case IPV6_SADDR_RULE_PREFIX:
1614 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1615 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1616 if (ret > score->ifa->prefix_len)
1617 ret = score->ifa->prefix_len;
1618 score->matchlen = ret;
a9b05723 1619 break;
7fd2561e
EK		 1620#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1621 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1622 /* Optimistic addresses still have lower precedence than other
1623 * preferred addresses.
1624 */
1625 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1626 break;
1627#endif
a9b05723
YH		 1628 default:
1629 ret = 0;
1630 }
1631
1632 if (ret)
1633 __set_bit(i, score->scorebits);
1634 score->rule = i;
1635out:
1636 return ret;
1637}
1638
c0b8da1e
YH		 1639static int __ipv6_dev_get_saddr(struct net *net,
1640 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1641 struct inet6_dev *idev,
1642 struct ipv6_saddr_score *scores,
1643 int hiscore_idx)
9131f3de 1644{
c0b8da1e 1645 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de 1646
f59c031e 1647 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
9131f3de
YH		 1648 int i;
1649
1650 /*
1651 * - Tentative Address (RFC2462 section 5.4)
1652 * - A tentative address is not considered
1653 * "assigned to an interface" in the traditional
1654 * sense, unless it is also flagged as optimistic.
1655 * - Candidate Source Address (section 4)
1656 * - In any case, anycast addresses, multicast
1657 * addresses, and the unspecified address MUST
1658 * NOT be included in a candidate set.
1659 */
1660 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1661 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1662 continue;
1663
1664 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1665
1666 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1667 score->addr_type & IPV6_ADDR_MULTICAST)) {
1668 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1669 idev->dev->name);
1670 continue;
1671 }
1672
1673 score->rule = -1;
1674 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1675
1676 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1677 int minihiscore, miniscore;
1678
1679 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1680 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1681
1682 if (minihiscore > miniscore) {
1683 if (i == IPV6_SADDR_RULE_SCOPE &&
1684 score->scopedist > 0) {
1685 /*
1686 * special case:
1687 * each remaining entry
1688 * has too small (not enough)
1689 * scope, because ifa entries
1690 * are sorted by their scope
1691 * values.
1692 */
1693 goto out;
1694 }
1695 break;
1696 } else if (minihiscore < miniscore) {
9131f3de 1697 swap(hiscore, score);
c0b8da1e 1698 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1699
1700 /* restore our iterator */
1701 score->ifa = hiscore->ifa;
1702
1703 break;
1704 }
1705 }
1706 }
1707out:
c0b8da1e 1708 return hiscore_idx;
9131f3de
YH		 1709}
1710
afbac601
DA		 1711static int ipv6_get_saddr_master(struct net *net,
1712 const struct net_device *dst_dev,
1713 const struct net_device *master,
1714 struct ipv6_saddr_dst *dst,
1715 struct ipv6_saddr_score *scores,
1716 int hiscore_idx)
1717{
1718 struct inet6_dev *idev;
1719
1720 idev = __in6_dev_get(dst_dev);
1721 if (idev)
1722 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1723 scores, hiscore_idx);
1724
1725 idev = __in6_dev_get(master);
1726 if (idev)
1727 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1728 scores, hiscore_idx);
1729
1730 return hiscore_idx;
1731}
1732
b3f644fc 1733int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1734 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1735 struct in6_addr *saddr)
1da177e4 1736{
c0b8da1e 1737 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1738 struct ipv6_saddr_dst dst;
9131f3de 1739 struct inet6_dev *idev;
072047e4 1740 struct net_device *dev;
a9b05723 1741 int dst_type;
9131f3de 1742 bool use_oif_addr = false;
c0b8da1e 1743 int hiscore_idx = 0;
cc429c8f 1744 int ret = 0;
1da177e4 1745
a9b05723
YH		 1746 dst_type = __ipv6_addr_type(daddr);
1747 dst.addr = daddr;
1748 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1749 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1750 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1751 dst.prefs = prefs;
a9b05723 1752
c0b8da1e
YH		 1753 scores[hiscore_idx].rule = -1;
1754 scores[hiscore_idx].ifa = NULL;
1da177e4 1755
8814c4b5 1756 rcu_read_lock();
1da177e4 1757
9131f3de
YH		 1758 /* Candidate Source Address (section 4)
1759 * - multicast and link-local destination address,
1760 * the set of candidate source address MUST only
1761 * include addresses assigned to interfaces
1762 * belonging to the same link as the outgoing
1763 * interface.
1764 * (- For site-local destination addresses, the
1765 * set of candidate source addresses MUST only
1766 * include addresses assigned to interfaces
1767 * belonging to the same site as the outgoing
1768 * interface.)
3985e8a3
EK		 1769 * - "It is RECOMMENDED that the candidate source addresses
1770 * be the set of unicast addresses assigned to the
1771 * interface that will be used to send to the destination
1772 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1773 */
1774 if (dst_dev) {
3985e8a3 1775 idev = __in6_dev_get(dst_dev);
9131f3de 1776 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1777 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1778 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1779 use_oif_addr = true;
1780 }
1781 }
a9b05723 1782
9131f3de 1783 if (use_oif_addr) {
c0b8da1e 1784 if (idev)
c15df306 1785 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de 1786 } else {
afbac601
DA		 1787 const struct net_device *master;
1788 int master_idx = 0;
1789
1790 /* if dst_dev exists and is enslaved to an L3 device, then
1791 * prefer addresses from dst_dev and then the master over
1792 * any other enslaved devices in the L3 domain.
1793 */
1794 master = l3mdev_master_dev_rcu(dst_dev);
1795 if (master) {
1796 master_idx = master->ifindex;
1797
1798 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1799 master, &dst,
1800 scores, hiscore_idx);
1801
1802 if (scores[hiscore_idx].ifa)
1803 goto out;
1804 }
1805
9131f3de 1806 for_each_netdev_rcu(net, dev) {
afbac601
DA		 1807 /* only consider addresses on devices in the
1808 * same L3 domain
1809 */
1810 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1811 continue;
9131f3de
YH		 1812 idev = __in6_dev_get(dev);
1813 if (!idev)
072047e4 1814 continue;
c15df306 1815 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1816 }
1817 }
afbac601
DA		 1818
1819out:
c0b8da1e 1820 hiscore = &scores[hiscore_idx];
a9b05723 1821 if (!hiscore->ifa)
cc429c8f
ED		 1822 ret = -EADDRNOTAVAIL;
1823 else
1824 *saddr = hiscore->ifa->addr;
1ab1457c 1825
cc429c8f
ED		 1826 rcu_read_unlock();
1827 return ret;
1da177e4 1828}
5e5f3f0f 1829EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1830
8965779d 1831int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1832 u32 banned_flags)
b7b1bfce
HFS		 1833{
1834 struct inet6_ifaddr *ifp;
1835 int err = -EADDRNOTAVAIL;
1836
602582ca
HFS		 1837 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1838 if (ifp->scope > IFA_LINK)
1839 break;
b7b1bfce
HFS		 1840 if (ifp->scope == IFA_LINK &&
1841 !(ifp->flags & banned_flags)) {
1842 *addr = ifp->addr;
1843 err = 0;
1844 break;
1845 }
1846 }
1847 return err;
1848}
1849
95c385b4 1850int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1851 u32 banned_flags)
1da177e4
LT		 1852{
1853 struct inet6_dev *idev;
1854 int err = -EADDRNOTAVAIL;
1855
8814c4b5 1856 rcu_read_lock();
e21e8467
SH		 1857 idev = __in6_dev_get(dev);
1858 if (idev) {
1da177e4 1859 read_lock_bh(&idev->lock);
b7b1bfce 1860 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1861 read_unlock_bh(&idev->lock);
1862 }
8814c4b5 1863 rcu_read_unlock();
1da177e4
LT		 1864 return err;
1865}
1866
d9bf82c2 1867static int ipv6_count_addresses(const struct inet6_dev *idev)
1da177e4 1868{
d9bf82c2 1869 const struct inet6_ifaddr *ifp;
1da177e4 1870 int cnt = 0;
1da177e4 1871
d9bf82c2
ED		 1872 rcu_read_lock();
1873 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1da177e4 1874 cnt++;
d9bf82c2 1875 rcu_read_unlock();
1da177e4
LT		 1876 return cnt;
1877}
1878
b71d1d42 1879int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1880 const struct net_device *dev, int strict)
c58da4c6 1881{
232378e8
DA		 1882 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1883 strict, IFA_F_TENTATIVE);
c58da4c6
EK		 1884}
1885EXPORT_SYMBOL(ipv6_chk_addr);
1886
1893ff20
DA		 1887/* device argument is used to find the L3 domain of interest. If
1888 * skip_dev_check is set, then the ifp device is not checked against
1889 * the passed in dev argument. So the 2 cases for addresses checks are:
1890 * 1. does the address exist in the L3 domain that dev is part of
1891 * (skip_dev_check = true), or
1892 *
1893 * 2. does the address exist on the specific device
1894 * (skip_dev_check = false)
1895 */
c58da4c6 1896int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
232378e8
DA		 1897 const struct net_device *dev, bool skip_dev_check,
1898 int strict, u32 banned_flags)
1da177e4 1899{
3f27fb23 1900 unsigned int hash = inet6_addr_hash(net, addr);
1893ff20 1901 const struct net_device *l3mdev;
eedf042a 1902 struct inet6_ifaddr *ifp;
c58da4c6 1903 u32 ifp_flags;
1da177e4 1904
480318a0 1905 rcu_read_lock();
232378e8 1906
1893ff20 1907 l3mdev = l3mdev_master_dev_rcu(dev);
232378e8
DA		 1908 if (skip_dev_check)
1909 dev = NULL;
1910
b67bfe0d 1911 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1912 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1913 continue;
1893ff20
DA		 1914
1915 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev)
1916 continue;
1917
c58da4c6
EK		 1918 /* Decouple optimistic from tentative for evaluation here.
1919 * Ban optimistic addresses explicitly, when required.
1920 */
1921 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1922 ? (ifp->flags&~IFA_F_TENTATIVE)
1923 : ifp->flags;
1da177e4 1924 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1925 !(ifp_flags&banned_flags) &&
63159f29 1926 (!dev || ifp->idev->dev == dev ||
eedf042a 1927 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
480318a0 1928 rcu_read_unlock();
eedf042a 1929 return 1;
1da177e4
LT		 1930 }
1931 }
5c578aed 1932
480318a0 1933 rcu_read_unlock();
eedf042a 1934 return 0;
1da177e4 1935}
c58da4c6 1936EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1937
1da177e4 1938
7df37ff3
CB		 1939/* Compares an address/prefix_len with addresses on device @dev.
1940 * If one is found it returns true.
1941 */
1942bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1943 const unsigned int prefix_len, struct net_device *dev)
1944{
47e26941
ED		 1945 const struct inet6_ifaddr *ifa;
1946 const struct inet6_dev *idev;
7df37ff3
CB		 1947 bool ret = false;
1948
1949 rcu_read_lock();
1950 idev = __in6_dev_get(dev);
1951 if (idev) {
47e26941 1952 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
7df37ff3
CB		 1953 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1954 if (ret)
1955 break;
1956 }
7df37ff3
CB		 1957 }
1958 rcu_read_unlock();
1959
1960 return ret;
1961}
1962EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1963
b71d1d42 1964int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84 1965{
24ba333b
ED		 1966 const struct inet6_ifaddr *ifa;
1967 const struct inet6_dev *idev;
52eeeb84
YH		 1968 int onlink;
1969
1970 onlink = 0;
1971 rcu_read_lock();
1972 idev = __in6_dev_get(dev);
1973 if (idev) {
24ba333b 1974 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1975 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1976 ifa->prefix_len);
1977 if (onlink)
1978 break;
1979 }
52eeeb84
YH		 1980 }
1981 rcu_read_unlock();
1982 return onlink;
1983}
52eeeb84
YH		 1984EXPORT_SYMBOL(ipv6_chk_prefix);
1985
9acd9f3a 1986struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1987 struct net_device *dev, int strict)
1da177e4 1988{
3f27fb23 1989 unsigned int hash = inet6_addr_hash(net, addr);
b79d1d54 1990 struct inet6_ifaddr *ifp, *result = NULL;
1da177e4 1991
24f226da
ED		 1992 rcu_read_lock();
1993 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1994 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1995 continue;
1da177e4 1996 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1997 if (!dev || ifp->idev->dev == dev ||
1da177e4 1998 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1999 result = ifp;
1da177e4
LT		 2000 in6_ifa_hold(ifp);
2001 break;
2002 }
2003 }
2004 }
24f226da 2005 rcu_read_unlock();
1da177e4 2006
b79d1d54 2007 return result;
1da177e4
LT		 2008}
2009
1da177e4
LT		 2010/* Gets referenced address, destroys ifaddr */
2011
cc411d0b 2012static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 2013{
3d171f39
LR		 2014 if (dad_failed)
2015 ifp->flags |= IFA_F_DADFAILED;
2016
ec8add2a 2017 if (ifp->flags&IFA_F_TEMPORARY) {
1da177e4
LT		 2018 struct inet6_ifaddr *ifpub;
2019 spin_lock_bh(&ifp->lock);
2020 ifpub = ifp->ifpub;
2021 if (ifpub) {
2022 in6_ifa_hold(ifpub);
2023 spin_unlock_bh(&ifp->lock);
969c5464 2024 ipv6_create_tempaddr(ifpub, true);
1da177e4
LT		 2025 in6_ifa_put(ifpub);
2026 } else {
2027 spin_unlock_bh(&ifp->lock);
2028 }
2029 ipv6_del_addr(ifp);
ec8add2a
SD		 2030 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2031 spin_lock_bh(&ifp->lock);
2032 addrconf_del_dad_work(ifp);
2033 ifp->flags |= IFA_F_TENTATIVE;
f1c02cfb
SD		 2034 if (dad_failed)
2035 ifp->flags &= ~IFA_F_OPTIMISTIC;
ec8add2a
SD		 2036 spin_unlock_bh(&ifp->lock);
2037 if (dad_failed)
2038 ipv6_ifa_notify(0, ifp);
2039 in6_ifa_put(ifp);
c15b1cca 2040 } else {
1da177e4 2041 ipv6_del_addr(ifp);
c15b1cca 2042 }
1da177e4
LT		 2043}
2044
f2344a13
HX		 2045static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2046{
2047 int err = -ENOENT;
2048
8e8e676d 2049 spin_lock_bh(&ifp->lock);
f2344a13
HX		 2050 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2051 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2052 err = 0;
2053 }
8e8e676d 2054 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 2055
2056 return err;
2057}
2058
da13c59b 2059void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
3c21edbd 2060{
1b34be74 2061 struct inet6_dev *idev = ifp->idev;
1855b7c3 2062 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 2063
853dc2e0
UB		 2064 if (addrconf_dad_end(ifp)) {
2065 in6_ifa_put(ifp);
f2344a13 2066 return;
853dc2e0 2067 }
f2344a13 2068
da13c59b
VP		 2069 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2070 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
9bdd8d40 2071
5f40ef77
HFS		 2072 spin_lock_bh(&ifp->lock);
2073
2074 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
5f40ef77
HFS		 2075 struct in6_addr new_addr;
2076 struct inet6_ifaddr *ifp2;
5f40ef77 2077 int retries = ifp->stable_privacy_retry + 1;
e6464b8c
DA		 2078 struct ifa6_config cfg = {
2079 .pfx = &new_addr,
2080 .plen = ifp->prefix_len,
2081 .ifa_flags = ifp->flags,
2082 .valid_lft = ifp->valid_lft,
2083 .preferred_lft = ifp->prefered_lft,
2084 .scope = ifp->scope,
2085 };
5f40ef77 2086
1855b7c3 2087 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 2088 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2089 ifp->idev->dev->name);
2090 goto errdad;
2091 }
2092
2093 new_addr = ifp->addr;
2094 if (ipv6_generate_stable_address(&new_addr, retries,
2095 idev))
2096 goto errdad;
2097
5f40ef77 2098 spin_unlock_bh(&ifp->lock);
1b34be74 2099
5f40ef77
HFS		 2100 if (idev->cnf.max_addresses &&
2101 ipv6_count_addresses(idev) >=
2102 idev->cnf.max_addresses)
2103 goto lock_errdad;
2104
2105 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2106 ifp->idev->dev->name);
2107
e6464b8c 2108 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
5f40ef77
HFS		 2109 if (IS_ERR(ifp2))
2110 goto lock_errdad;
2111
2112 spin_lock_bh(&ifp2->lock);
2113 ifp2->stable_privacy_retry = retries;
2114 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2115 spin_unlock_bh(&ifp2->lock);
2116
1855b7c3 2117 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 2118 in6_ifa_put(ifp2);
2119lock_errdad:
2120 spin_lock_bh(&ifp->lock);
1b34be74
YH		 2121 }
2122
5f40ef77 2123errdad:
c15b1cca
HFS		 2124 /* transition from _POSTDAD to _ERRDAD */
2125 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 2126 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 2127
2128 addrconf_mod_dad_work(ifp, 0);
751eb6b6 2129 in6_ifa_put(ifp);
3c21edbd 2130}
1da177e4 2131
a9ed4a29
SD		 2132/* Join to solicited addr multicast group.
2133 * caller must hold RTNL */
b71d1d42 2134void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 2135{
2136 struct in6_addr maddr;
2137
2138 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2139 return;
2140
2141 addrconf_addr_solict_mult(addr, &maddr);
2142 ipv6_dev_mc_inc(dev, &maddr);
2143}
2144
a9ed4a29 2145/* caller must hold RTNL */
b71d1d42 2146void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 2147{
2148 struct in6_addr maddr;
2149
2150 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2151 return;
2152
2153 addrconf_addr_solict_mult(addr, &maddr);
2154 __ipv6_dev_mc_dec(idev, &maddr);
2155}
2156
a9ed4a29 2157/* caller must hold RTNL */
20380731 2158static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2159{
2160 struct in6_addr addr;
c15b1cca 2161
88ad3149 2162 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 2163 return;
1da177e4
LT		 2164 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2165 if (ipv6_addr_any(&addr))
2166 return;
013b4d90 2167 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 2168}
2169
a9ed4a29 2170/* caller must hold RTNL */
20380731 2171static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2172{
2173 struct in6_addr addr;
c15b1cca 2174
88ad3149 2175 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 2176 return;
1da177e4
LT		 2177 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2178 if (ipv6_addr_any(&addr))
2179 return;
2180 __ipv6_dev_ac_dec(ifp->idev, &addr);
2181}
2182
8a7a4b47 2183static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
06a4c1c5 2184{
8a7a4b47
AA		 2185 switch (dev->addr_len) {
2186 case ETH_ALEN:
9dae2e03
LAD		 2187 memcpy(eui, dev->dev_addr, 3);
2188 eui[3] = 0xFF;
2189 eui[4] = 0xFE;
2190 memcpy(eui + 5, dev->dev_addr + 3, 3);
2191 break;
8a7a4b47
AA		 2192 case EUI64_ADDR_LEN:
2193 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2194 eui[0] ^= 2;
2195 break;
2196 default:
06a4c1c5 2197 return -1;
8a7a4b47
AA		 2198 }
2199
06a4c1c5 2200 return 0;
2201}
2202
cb6bf355
YH		 2203static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2204{
2205 union fwnet_hwaddr *ha;
2206
2207 if (dev->addr_len != FWNET_ALEN)
2208 return -1;
2209
2210 ha = (union fwnet_hwaddr *)dev->dev_addr;
2211
2212 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2213 eui[0] ^= 2;
2214 return 0;
2215}
2216
073a8e0e
YH		 2217static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2218{
2219 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2220 if (dev->addr_len != ARCNET_ALEN)
2221 return -1;
2222 memset(eui, 0, 7);
8e5e8f30 2223 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 2224 return 0;
2225}
2226
2227static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2228{
2229 if (dev->addr_len != INFINIBAND_ALEN)
2230 return -1;
2231 memcpy(eui, dev->dev_addr + 12, 8);
2232 eui[0] |= 2;
2233 return 0;
2234}
2235
c61393ea 2236static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2237{
9af28511
SH		 2238 if (addr == 0)
2239 return -1;
dfd982ba
YH		 2240 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2241 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2242 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2243 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2244 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2245 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2246 eui[1] = 0;
2247 eui[2] = 0x5E;
2248 eui[3] = 0xFE;
2249 memcpy(eui + 4, &addr, 4);
2250 return 0;
2251}
dfd982ba
YH		 2252
2253static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2254{
2255 if (dev->priv_flags & IFF_ISATAP)
2256 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2257 return -1;
2258}
2259
aee80b54 2260static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2261{
2262 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2263}
2264
e837735e
ND		 2265static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2266{
2267 memcpy(eui, dev->perm_addr, 3);
2268 memcpy(eui + 5, dev->perm_addr + 3, 3);
2269 eui[3] = 0xFF;
2270 eui[4] = 0xFE;
2271 eui[0] ^= 2;
2272 return 0;
2273}
2274
1da177e4
LT		 2275static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2276{
2277 switch (dev->type) {
2278 case ARPHRD_ETHER:
2279 case ARPHRD_FDDI:
073a8e0e 2280 return addrconf_ifid_eui48(eui, dev);
1da177e4 2281 case ARPHRD_ARCNET:
073a8e0e 2282 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2283 case ARPHRD_INFINIBAND:
073a8e0e 2284 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2285 case ARPHRD_SIT:
dfd982ba 2286 return addrconf_ifid_sit(eui, dev);
aee80b54 2287 case ARPHRD_IPGRE:
45ce0fd1 2288 case ARPHRD_TUNNEL:
aee80b54 2289 return addrconf_ifid_gre(eui, dev);
e74bccb8 2290 case ARPHRD_6LOWPAN:
8a7a4b47 2291 return addrconf_ifid_6lowpan(eui, dev);
cb6bf355
YH		 2292 case ARPHRD_IEEE1394:
2293 return addrconf_ifid_ieee1394(eui, dev);
e837735e 2294 case ARPHRD_TUNNEL6:
45ce0fd1 2295 case ARPHRD_IP6GRE:
9deb441c 2296 case ARPHRD_RAWIP:
e837735e 2297 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2298 }
2299 return -1;
2300}
2301
2302static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2303{
2304 int err = -1;
2305 struct inet6_ifaddr *ifp;
2306
2307 read_lock_bh(&idev->lock);
602582ca
HFS		 2308 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2309 if (ifp->scope > IFA_LINK)
2310 break;
1da177e4
LT		 2311 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2312 memcpy(eui, ifp->addr.s6_addr+8, 8);
2313 err = 0;
2314 break;
2315 }
2316 }
2317 read_unlock_bh(&idev->lock);
2318 return err;
2319}
2320
969c5464
FG		 2321/* Generation of a randomized Interface Identifier
2322 * draft-ietf-6man-rfc4941bis, Section 3.3.1
2323 */
2324
2325static void ipv6_gen_rnd_iid(struct in6_addr *addr)
1da177e4 2326{
1da177e4 2327regen:
969c5464 2328 get_random_bytes(&addr->s6_addr[8], 8);
1da177e4 2329
969c5464
FG		 2330 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1:
2331 * check if generated address is not inappropriate:
1da177e4 2332 *
969c5464
FG		 2333 * - Reserved IPv6 Interface Identifers
2334 * - XXX: already assigned to an address on the device
1da177e4 2335 */
969c5464
FG		 2336
2337 /* Subnet-router anycast: 0000:0000:0000:0000 */
2338 if (!(addr->s6_addr32[2] | addr->s6_addr32[3]))
1da177e4 2339 goto regen;
1da177e4 2340
969c5464
FG		 2341 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212
2342 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213
2343 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF
2344 */
2345 if (ntohl(addr->s6_addr32[2]) == 0x02005eff &&
2346 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000)
2347 goto regen;
2348
2349 /* Reserved subnet anycast addresses */
2350 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff &&
2351 ntohl(addr->s6_addr32[3]) >= 0Xffffff80)
2352 goto regen;
1da177e4 2353}
1da177e4
LT		 2354
2355/*
2356 * Add prefix route.
2357 */
2358
2359static void
8308f3ff
DA		 2360addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2361 struct net_device *dev, unsigned long expires,
2362 u32 flags, gfp_t gfp_flags)
1da177e4 2363{
86872cb5 2364 struct fib6_config cfg = {
ca254490 2365 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
8308f3ff 2366 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
86872cb5
TG		 2367 .fc_ifindex = dev->ifindex,
2368 .fc_expires = expires,
2369 .fc_dst_len = plen,
2370 .fc_flags = RTF_UP | flags,
c346dca1 2371 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2372 .fc_protocol = RTPROT_KERNEL,
e8478e80 2373 .fc_type = RTN_UNICAST,
86872cb5 2374 };
1da177e4 2375
4e3fd7a0 2376 cfg.fc_dst = *pfx;
1da177e4
LT		 2377
2378 /* Prevent useless cloning on PtP SIT.
2379 This thing is done here expecting that the whole
2380 class of non-broadcast devices need not cloning.
2381 */
07a93626 2382#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2383 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2384 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2385#endif
1da177e4 2386
acb54e3c 2387 ip6_route_add(&cfg, gfp_flags, NULL);
1da177e4
LT		 2388}
2389
14ef37b6 2390
8d1c802b 2391static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
14ef37b6
AH		 2392 int plen,
2393 const struct net_device *dev,
2b2450ca
DA		 2394 u32 flags, u32 noflags,
2395 bool no_gw)
14ef37b6
AH		 2396{
2397 struct fib6_node *fn;
8d1c802b 2398 struct fib6_info *rt = NULL;
14ef37b6 2399 struct fib6_table *table;
ca254490 2400 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2401
ca254490 2402 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2403 if (!table)
14ef37b6
AH		 2404 return NULL;
2405
66f5d6ce 2406 rcu_read_lock();
38fbeeee 2407 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
14ef37b6
AH		 2408 if (!fn)
2409 goto out;
1f56a01f 2410
66f5d6ce 2411 for_each_fib6_node_rt_rcu(fn) {
f88d8ea6
DA		 2412 /* prefix routes only use builtin fib6_nh */
2413 if (rt->nh)
2414 continue;
2415
1cf844c7 2416 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
14ef37b6 2417 continue;
1cf844c7 2418 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2b2450ca 2419 continue;
93c2fb25 2420 if ((rt->fib6_flags & flags) != flags)
14ef37b6 2421 continue;
93c2fb25 2422 if ((rt->fib6_flags & noflags) != 0)
14ef37b6 2423 continue;
e873e4b9
WW		 2424 if (!fib6_info_hold_safe(rt))
2425 continue;
14ef37b6
AH		 2426 break;
2427 }
2428out:
66f5d6ce 2429 rcu_read_unlock();
14ef37b6
AH		 2430 return rt;
2431}
2432
2433
1da177e4
LT		 2434/* Create "default" multicast route to the interface */
2435
2436static void addrconf_add_mroute(struct net_device *dev)
2437{
86872cb5 2438 struct fib6_config cfg = {
ca254490 2439 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2440 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2441 .fc_ifindex = dev->ifindex,
2442 .fc_dst_len = 8,
2443 .fc_flags = RTF_UP,
e8478e80 2444 .fc_type = RTN_UNICAST,
c346dca1 2445 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2446 };
2447
2448 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2449
e500c6d3 2450 ip6_route_add(&cfg, GFP_KERNEL, NULL);
1da177e4
LT		 2451}
2452
1da177e4
LT		 2453static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2454{
2455 struct inet6_dev *idev;
2456
2457 ASSERT_RTNL();
2458
e21e8467 2459 idev = ipv6_find_idev(dev);
db0b99f5
SD		 2460 if (IS_ERR(idev))
2461 return idev;
64e724f6
BH		 2462
2463 if (idev->cnf.disable_ipv6)
2464 return ERR_PTR(-EACCES);
1da177e4
LT		 2465
2466 /* Add default multicast route */
ba46ee4c 2467 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
4af04aba 2468 addrconf_add_mroute(dev);
1da177e4 2469
1da177e4
LT		 2470 return idev;
2471}
2472
53bd6749
JP		 2473static void manage_tempaddrs(struct inet6_dev *idev,
2474 struct inet6_ifaddr *ifp,
2475 __u32 valid_lft, __u32 prefered_lft,
2476 bool create, unsigned long now)
2477{
2478 u32 flags;
2479 struct inet6_ifaddr *ift;
2480
2481 read_lock_bh(&idev->lock);
2482 /* update all temporary addresses in the list */
2483 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2484 int age, max_valid, max_prefered;
2485
2486 if (ifp != ift->ifpub)
2487 continue;
2488
2489 /* RFC 4941 section 3.3:
2490 * If a received option will extend the lifetime of a public
2491 * address, the lifetimes of temporary addresses should
2492 * be extended, subject to the overall constraint that no
2493 * temporary addresses should ever remain "valid" or "preferred"
2494 * for a time longer than (TEMP_VALID_LIFETIME) or
2495 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2496 */
2497 age = (now - ift->cstamp) / HZ;
2498 max_valid = idev->cnf.temp_valid_lft - age;
2499 if (max_valid < 0)
2500 max_valid = 0;
2501
2502 max_prefered = idev->cnf.temp_prefered_lft -
76506a98 2503 idev->desync_factor - age;
53bd6749
JP		 2504 if (max_prefered < 0)
2505 max_prefered = 0;
2506
2507 if (valid_lft > max_valid)
2508 valid_lft = max_valid;
2509
2510 if (prefered_lft > max_prefered)
2511 prefered_lft = max_prefered;
2512
2513 spin_lock(&ift->lock);
2514 flags = ift->flags;
2515 ift->valid_lft = valid_lft;
2516 ift->prefered_lft = prefered_lft;
2517 ift->tstamp = now;
2518 if (prefered_lft > 0)
2519 ift->flags &= ~IFA_F_DEPRECATED;
2520
2521 spin_unlock(&ift->lock);
2522 if (!(flags&IFA_F_TENTATIVE))
2523 ipv6_ifa_notify(0, ift);
2524 }
2525
2526 if ((create || list_empty(&idev->tempaddr_list)) &&
2527 idev->cnf.use_tempaddr > 0) {
2528 /* When a new public address is created as described
2529 * in [ADDRCONF], also create a new temporary address.
2530 * Also create a temporary address if it's enabled but
2531 * no temporary address currently exists.
2532 */
2533 read_unlock_bh(&idev->lock);
969c5464 2534 ipv6_create_tempaddr(ifp, false);
53bd6749
JP		 2535 } else {
2536 read_unlock_bh(&idev->lock);
2537 }
2538}
2539
cc9da6cc
BM		 2540static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2541{
d35a00b8
FJ		 2542 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2543 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc
BM		 2544}
2545
cc84b3c6
AA		 2546int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2547 const struct prefix_info *pinfo,
2548 struct inet6_dev *in6_dev,
2549 const struct in6_addr *addr, int addr_type,
2550 u32 addr_flags, bool sllao, bool tokenized,
2551 __u32 valid_lft, u32 prefered_lft)
4f672235
AA		 2552{
2553 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
b75326c2 2554 int create = 0;
4f672235
AA		 2555
2556 if (!ifp && valid_lft) {
2557 int max_addresses = in6_dev->cnf.max_addresses;
e6464b8c
DA		 2558 struct ifa6_config cfg = {
2559 .pfx = addr,
2560 .plen = pinfo->prefix_len,
2561 .ifa_flags = addr_flags,
2562 .valid_lft = valid_lft,
2563 .preferred_lft = prefered_lft,
2564 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2565 };
4f672235
AA		 2566
2567#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 2568 if ((net->ipv6.devconf_all->optimistic_dad ||
2569 in6_dev->cnf.optimistic_dad) &&
4f672235 2570 !net->ipv6.devconf_all->forwarding && sllao)
e6464b8c 2571 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
4f672235
AA		 2572#endif
2573
2574 /* Do not allow to create too much of autoconfigured
2575 * addresses; this would be too easy way to crash kernel.
2576 */
2577 if (!max_addresses ||
2578 ipv6_count_addresses(in6_dev) < max_addresses)
e6464b8c 2579 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
4f672235
AA		 2580
2581 if (IS_ERR_OR_NULL(ifp))
2582 return -1;
2583
4f672235
AA		 2584 create = 1;
2585 spin_lock_bh(&ifp->lock);
2586 ifp->flags |= IFA_F_MANAGETEMPADDR;
2587 ifp->cstamp = jiffies;
2588 ifp->tokenized = tokenized;
2589 spin_unlock_bh(&ifp->lock);
2590 addrconf_dad_start(ifp);
2591 }
2592
2593 if (ifp) {
2594 u32 flags;
2595 unsigned long now;
2596 u32 stored_lft;
2597
b75326c2
FG		 2598 /* Update lifetime (RFC4862 5.5.3 e)
2599 * We deviate from RFC4862 by honoring all Valid Lifetimes to
2600 * improve the reaction of SLAAC to renumbering events
2601 * (draft-gont-6man-slaac-renum-06, Section 4.2)
2602 */
4f672235
AA		 2603 spin_lock_bh(&ifp->lock);
2604 now = jiffies;
2605 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2606 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2607 else
2608 stored_lft = 0;
4f672235 2609
b75326c2 2610 if (!create && stored_lft) {
4f672235
AA		 2611 ifp->valid_lft = valid_lft;
2612 ifp->prefered_lft = prefered_lft;
2613 ifp->tstamp = now;
2614 flags = ifp->flags;
2615 ifp->flags &= ~IFA_F_DEPRECATED;
2616 spin_unlock_bh(&ifp->lock);
2617
2618 if (!(flags&IFA_F_TENTATIVE))
2619 ipv6_ifa_notify(0, ifp);
2620 } else
2621 spin_unlock_bh(&ifp->lock);
2622
2623 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2624 create, now);
2625
2626 in6_ifa_put(ifp);
2627 addrconf_verify();
2628 }
2629
2630 return 0;
2631}
cc84b3c6 2632EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
4f672235 2633
e6bff995 2634void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2635{
2636 struct prefix_info *pinfo;
2637 __u32 valid_lft;
2638 __u32 prefered_lft;
4f672235 2639 int addr_type, err;
64236f3f 2640 u32 addr_flags = 0;
1da177e4 2641 struct inet6_dev *in6_dev;
56d417b1 2642 struct net *net = dev_net(dev);
1da177e4
LT		 2643
2644 pinfo = (struct prefix_info *) opt;
1ab1457c 2645
1da177e4 2646 if (len < sizeof(struct prefix_info)) {
e32ac250 2647 netdev_dbg(dev, "addrconf: prefix option too short\n");
1da177e4
LT		 2648 return;
2649 }
1ab1457c 2650
1da177e4
LT		 2651 /*
2652 * Validation checks ([ADDRCONF], page 19)
2653 */
2654
2655 addr_type = ipv6_addr_type(&pinfo->prefix);
2656
2657 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2658 return;
2659
2660 valid_lft = ntohl(pinfo->valid);
2661 prefered_lft = ntohl(pinfo->prefered);
2662
2663 if (prefered_lft > valid_lft) {
e87cc472 2664 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2665 return;
2666 }
2667
2668 in6_dev = in6_dev_get(dev);
2669
63159f29 2670 if (!in6_dev) {
e87cc472
JP		 2671 net_dbg_ratelimited("addrconf: device %s not configured\n",
2672 dev->name);
1da177e4
LT		 2673 return;
2674 }
2675
2676 /*
2677 * Two things going on here:
2678 * 1) Add routes for on-link prefixes
2679 * 2) Configure prefixes with the auto flag set
2680 */
2681
4bed72e4 2682 if (pinfo->onlink) {
8d1c802b 2683 struct fib6_info *rt;
4bed72e4
YH		 2684 unsigned long rt_expires;
2685
6f704992
YH		 2686 /* Avoid arithmetic overflow. Really, we could
2687 * save rt_expires in seconds, likely valid_lft,
2688 * but it would require division in fib gc, that it
2689 * not good.
2690 */
4bed72e4
YH		 2691 if (HZ > USER_HZ)
2692 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2693 else
2694 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2695
4bed72e4
YH		 2696 if (addrconf_finite_timeout(rt_expires))
2697 rt_expires *= HZ;
1da177e4 2698
14ef37b6
AH		 2699 rt = addrconf_get_prefix_route(&pinfo->prefix,
2700 pinfo->prefix_len,
2701 dev,
2702 RTF_ADDRCONF | RTF_PREFIX_RT,
2b2450ca 2703 RTF_DEFAULT, true);
1da177e4 2704
14ef37b6 2705 if (rt) {
6f704992
YH		 2706 /* Autoconf prefix route */
2707 if (valid_lft == 0) {
11dd74b3 2708 ip6_del_rt(net, rt, false);
6f704992 2709 rt = NULL;
4bed72e4 2710 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2711 /* not infinity */
14895687 2712 fib6_set_expires(rt, jiffies + rt_expires);
6f704992 2713 } else {
14895687 2714 fib6_clean_expires(rt);
1da177e4
LT		 2715 }
2716 } else if (valid_lft) {
6f704992 2717 clock_t expires = 0;
4bed72e4
YH		 2718 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2719 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2720 /* not infinity */
2721 flags |= RTF_EXPIRES;
2722 expires = jiffies_to_clock_t(rt_expires);
2723 }
1da177e4 2724 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
8308f3ff
DA		 2725 0, dev, expires, flags,
2726 GFP_ATOMIC);
1da177e4 2727 }
93531c67 2728 fib6_info_release(rt);
1da177e4
LT		 2729 }
2730
2731 /* Try to figure out our local address for this prefix */
2732
2733 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1da177e4 2734 struct in6_addr addr;
f997c55c 2735 bool tokenized = false, dev_addr_generated = false;
1da177e4
LT		 2736
2737 if (pinfo->prefix_len == 64) {
2738 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2739
2740 if (!ipv6_addr_any(&in6_dev->token)) {
2741 read_lock_bh(&in6_dev->lock);
2742 memcpy(addr.s6_addr + 8,
2743 in6_dev->token.s6_addr + 8, 8);
2744 read_unlock_bh(&in6_dev->lock);
617fe29d 2745 tokenized = true;
cc9da6cc 2746 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2747 !ipv6_generate_stable_address(&addr, 0,
2748 in6_dev)) {
64236f3f 2749 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2750 goto ok;
f53adae4
DB		 2751 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2752 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
4f672235 2753 goto put;
f997c55c
AA		 2754 } else {
2755 dev_addr_generated = true;
1da177e4
LT		 2756 }
2757 goto ok;
2758 }
e87cc472
JP		 2759 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2760 pinfo->prefix_len);
4f672235 2761 goto put;
1da177e4
LT		 2762
2763ok:
4f672235
AA		 2764 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2765 &addr, addr_type,
2766 addr_flags, sllao,
2767 tokenized, valid_lft,
2768 prefered_lft);
2769 if (err)
2770 goto put;
f997c55c
AA		 2771
2772 /* Ignore error case here because previous prefix add addr was
2773 * successful which will be notified.
2774 */
2775 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2776 addr_type, addr_flags, sllao,
2777 tokenized, valid_lft,
2778 prefered_lft,
2779 dev_addr_generated);
1da177e4
LT		 2780 }
2781 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
4f672235 2782put:
1da177e4
LT		 2783 in6_dev_put(in6_dev);
2784}
2785
68ad6886
CH		 2786static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
2787 struct in6_ifreq *ireq)
2788{
2789 struct ip_tunnel_parm p = { };
2790 mm_segment_t oldfs = get_fs();
2791 struct ifreq ifr;
2792 int err;
2793
2794 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
2795 return -EADDRNOTAVAIL;
2796
2797 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3];
2798 p.iph.version = 4;
2799 p.iph.ihl = 5;
2800 p.iph.protocol = IPPROTO_IPV6;
2801 p.iph.ttl = 64;
2802 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2803
2804 if (!dev->netdev_ops->ndo_do_ioctl)
2805 return -EOPNOTSUPP;
2806 set_fs(KERNEL_DS);
2807 err = dev->netdev_ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2808 set_fs(oldfs);
2809 if (err)
2810 return err;
2811
2812 dev = __dev_get_by_name(net, p.name);
2813 if (!dev)
2814 return -ENOBUFS;
2815 return dev_open(dev, NULL);
2816}
2817
1da177e4
LT		 2818/*
2819 * Set destination address.
2820 * Special case for SIT interfaces where we create a new "virtual"
2821 * device.
2822 */
af284937 2823int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4 2824{
1da177e4 2825 struct net_device *dev;
68ad6886
CH		 2826 struct in6_ifreq ireq;
2827 int err = -ENODEV;
1da177e4 2828
f0988460
CH		 2829 if (!IS_ENABLED(CONFIG_IPV6_SIT))
2830 return -ENODEV;
1da177e4 2831 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
68ad6886 2832 return -EFAULT;
1da177e4 2833
68ad6886 2834 rtnl_lock();
af284937 2835 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
68ad6886
CH		 2836 if (dev && dev->type == ARPHRD_SIT)
2837 err = addrconf_set_sit_dstaddr(net, dev, &ireq);
1da177e4
LT		 2838 rtnl_unlock();
2839 return err;
2840}
2841
93a714d6
MC		 2842static int ipv6_mc_config(struct sock *sk, bool join,
2843 const struct in6_addr *addr, int ifindex)
2844{
2845 int ret;
2846
2847 ASSERT_RTNL();
2848
2849 lock_sock(sk);
2850 if (join)
54ff9ef3 2851 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2852 else
54ff9ef3 2853 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2854 release_sock(sk);
2855
2856 return ret;
2857}
2858
1da177e4
LT		 2859/*
2860 * Manual configuration of address on an interface
2861 */
479840ff 2862static int inet6_addr_add(struct net *net, int ifindex,
19b1518c 2863 struct ifa6_config *cfg,
de95e047 2864 struct netlink_ext_ack *extack)
1da177e4
LT		 2865{
2866 struct inet6_ifaddr *ifp;
2867 struct inet6_dev *idev;
2868 struct net_device *dev;
93a714d6
MC		 2869 unsigned long timeout;
2870 clock_t expires;
6f704992 2871 u32 flags;
1da177e4
LT		 2872
2873 ASSERT_RTNL();
1ab1457c 2874
19b1518c 2875 if (cfg->plen > 128)
24ef0da7
TG		 2876 return -EINVAL;
2877
0778769d 2878 /* check the lifetime */
19b1518c 2879 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
0778769d
NT		 2880 return -EINVAL;
2881
19b1518c 2882 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
53bd6749
JP		 2883 return -EINVAL;
2884
af284937
DL		 2885 dev = __dev_get_by_index(net, ifindex);
2886 if (!dev)
1da177e4 2887 return -ENODEV;
1ab1457c 2888
64e724f6
BH		 2889 idev = addrconf_add_dev(dev);
2890 if (IS_ERR(idev))
2891 return PTR_ERR(idev);
1da177e4 2892
19b1518c 2893 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
93a714d6 2894 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
19b1518c 2895 true, cfg->pfx, ifindex);
93a714d6
MC		 2896
2897 if (ret < 0)
2898 return ret;
2899 }
2900
19b1518c 2901 cfg->scope = ipv6_addr_scope(cfg->pfx);
1da177e4 2902
19b1518c 2903 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4bed72e4
YH		 2904 if (addrconf_finite_timeout(timeout)) {
2905 expires = jiffies_to_clock_t(timeout * HZ);
19b1518c 2906 cfg->valid_lft = timeout;
6f704992 2907 flags = RTF_EXPIRES;
4bed72e4
YH		 2908 } else {
2909 expires = 0;
2910 flags = 0;
19b1518c 2911 cfg->ifa_flags |= IFA_F_PERMANENT;
6f704992 2912 }
0778769d 2913
19b1518c 2914 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4bed72e4
YH		 2915 if (addrconf_finite_timeout(timeout)) {
2916 if (timeout == 0)
19b1518c
DA		 2917 cfg->ifa_flags |= IFA_F_DEPRECATED;
2918 cfg->preferred_lft = timeout;
4bed72e4 2919 }
0778769d 2920
19b1518c 2921 ifp = ipv6_add_addr(idev, cfg, true, extack);
1da177e4 2922 if (!IS_ERR(ifp)) {
19b1518c 2923 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
8308f3ff
DA		 2924 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2925 ifp->rt_priority, dev, expires,
2926 flags, GFP_KERNEL);
761aac73
TH		 2927 }
2928
a2d481b3
LB		 2929 /* Send a netlink notification if DAD is enabled and
2930 * optimistic flag is not set
2931 */
2932 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2933 ipv6_ifa_notify(0, ifp);
95c385b4
NH		 2934 /*
2935 * Note that section 3.1 of RFC 4429 indicates
2936 * that the Optimistic flag should not be set for
2937 * manually configured addresses
2938 */
cf22f9a2 2939 addrconf_dad_start(ifp);
19b1518c
DA		 2940 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2941 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2942 cfg->preferred_lft, true, jiffies);
1da177e4 2943 in6_ifa_put(ifp);
c15b1cca 2944 addrconf_verify_rtnl();
1da177e4 2945 return 0;
19b1518c
DA		 2946 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2947 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
2948 cfg->pfx, ifindex);
1da177e4
LT		 2949 }
2950
2951 return PTR_ERR(ifp);
2952}
2953
6046d5b4
HK		 2954static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2955 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2956{
2957 struct inet6_ifaddr *ifp;
2958 struct inet6_dev *idev;
2959 struct net_device *dev;
1ab1457c 2960
24ef0da7
TG		 2961 if (plen > 128)
2962 return -EINVAL;
2963
af284937
DL		 2964 dev = __dev_get_by_index(net, ifindex);
2965 if (!dev)
1da177e4
LT		 2966 return -ENODEV;
2967
e5d08d71 2968 idev = __in6_dev_get(dev);
63159f29 2969 if (!idev)
1da177e4
LT		 2970 return -ENXIO;
2971
2972 read_lock_bh(&idev->lock);
502a2ffd 2973 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2974 if (ifp->prefix_len == plen &&
2975 ipv6_addr_equal(pfx, &ifp->addr)) {
2976 in6_ifa_hold(ifp);
2977 read_unlock_bh(&idev->lock);
1ab1457c 2978
6046d5b4
HK		 2979 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2980 (ifa_flags & IFA_F_MANAGETEMPADDR))
2981 manage_tempaddrs(idev, ifp, 0, 0, false,
2982 jiffies);
1da177e4 2983 ipv6_del_addr(ifp);
6046d5b4 2984 addrconf_verify_rtnl();
93a714d6
MC		 2985 if (ipv6_addr_is_multicast(pfx)) {
2986 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2987 false, pfx, dev->ifindex);
2988 }
1da177e4
LT		 2989 return 0;
2990 }
2991 }
2992 read_unlock_bh(&idev->lock);
2993 return -EADDRNOTAVAIL;
2994}
2995
2996
af284937 2997int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4 2998{
19b1518c
DA		 2999 struct ifa6_config cfg = {
3000 .ifa_flags = IFA_F_PERMANENT,
3001 .preferred_lft = INFINITY_LIFE_TIME,
3002 .valid_lft = INFINITY_LIFE_TIME,
3003 };
1da177e4
LT		 3004 struct in6_ifreq ireq;
3005 int err;
1ab1457c 3006
af31f412 3007 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 3008 return -EPERM;
1ab1457c 3009
1da177e4
LT		 3010 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3011 return -EFAULT;
3012
19b1518c
DA		 3013 cfg.pfx = &ireq.ifr6_addr;
3014 cfg.plen = ireq.ifr6_prefixlen;
3015
1da177e4 3016 rtnl_lock();
19b1518c 3017 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
1da177e4
LT		 3018 rtnl_unlock();
3019 return err;
3020}
3021
af284937 3022int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 3023{
3024 struct in6_ifreq ireq;
3025 int err;
1ab1457c 3026
af31f412 3027 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 3028 return -EPERM;
3029
3030 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3031 return -EFAULT;
3032
3033 rtnl_lock();
6046d5b4 3034 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 3035 ireq.ifr6_prefixlen);
1da177e4
LT		 3036 rtnl_unlock();
3037 return err;
3038}
3039
b5f348e5
IJ		 3040static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3041 int plen, int scope)
3042{
3043 struct inet6_ifaddr *ifp;
e6464b8c
DA		 3044 struct ifa6_config cfg = {
3045 .pfx = addr,
3046 .plen = plen,
3047 .ifa_flags = IFA_F_PERMANENT,
3048 .valid_lft = INFINITY_LIFE_TIME,
3049 .preferred_lft = INFINITY_LIFE_TIME,
3050 .scope = scope
3051 };
b5f348e5 3052
e6464b8c 3053 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
b5f348e5
IJ		 3054 if (!IS_ERR(ifp)) {
3055 spin_lock_bh(&ifp->lock);
3056 ifp->flags &= ~IFA_F_TENTATIVE;
3057 spin_unlock_bh(&ifp->lock);
764d3be6 3058 rt_genid_bump_ipv6(dev_net(idev->dev));
b5f348e5
IJ		 3059 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3060 in6_ifa_put(ifp);
3061 }
3062}
3063
07a93626 3064#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3065static void sit_add_v4_addrs(struct inet6_dev *idev)
3066{
1da177e4
LT		 3067 struct in6_addr addr;
3068 struct net_device *dev;
c346dca1 3069 struct net *net = dev_net(idev->dev);
929c9cf3 3070 int scope, plen;
f0e2acfa 3071 u32 pflags = 0;
1da177e4
LT		 3072
3073 ASSERT_RTNL();
3074
3075 memset(&addr, 0, sizeof(struct in6_addr));
3076 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3077
3078 if (idev->dev->flags&IFF_POINTOPOINT) {
3079 addr.s6_addr32[0] = htonl(0xfe800000);
3080 scope = IFA_LINK;
929c9cf3 3081 plen = 64;
1da177e4
LT		 3082 } else {
3083 scope = IPV6_ADDR_COMPATv4;
929c9cf3 3084 plen = 96;
f0e2acfa 3085 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 3086 }
3087
3088 if (addr.s6_addr32[3]) {
929c9cf3 3089 add_addr(idev, &addr, plen, scope);
8308f3ff 3090 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
e500c6d3 3091 GFP_KERNEL);
1da177e4
LT		 3092 return;
3093 }
3094
6fda7350 3095 for_each_netdev(net, dev) {
8e5e8f30 3096 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 3097 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 3098 struct in_ifaddr *ifa;
1da177e4
LT		 3099 int flag = scope;
3100
cd5a411d 3101 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1da177e4
LT		 3102 addr.s6_addr32[3] = ifa->ifa_local;
3103
3104 if (ifa->ifa_scope == RT_SCOPE_LINK)
3105 continue;
3106 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3107 if (idev->dev->flags&IFF_POINTOPOINT)
3108 continue;
3109 flag |= IFA_HOST;
3110 }
1da177e4 3111
b5f348e5 3112 add_addr(idev, &addr, plen, flag);
8308f3ff 3113 addrconf_prefix_route(&addr, plen, 0, idev->dev,
e500c6d3 3114 0, pflags, GFP_KERNEL);
1da177e4
LT		 3115 }
3116 }
1ab1457c 3117 }
1da177e4 3118}
0be669bb 3119#endif
1da177e4
LT		 3120
3121static void init_loopback(struct net_device *dev)
3122{
3123 struct inet6_dev *idev;
1da177e4
LT		 3124
3125 /* ::1 */
3126
3127 ASSERT_RTNL();
3128
e5d08d71 3129 idev = ipv6_find_idev(dev);
db0b99f5 3130 if (IS_ERR(idev)) {
91df42be 3131 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3132 return;
3133 }
3134
b5f348e5 3135 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 3136}
3137
2ad3ed59
AA		 3138void addrconf_add_linklocal(struct inet6_dev *idev,
3139 const struct in6_addr *addr, u32 flags)
1da177e4 3140{
e6464b8c
DA		 3141 struct ifa6_config cfg = {
3142 .pfx = addr,
3143 .plen = 64,
3144 .ifa_flags = flags | IFA_F_PERMANENT,
3145 .valid_lft = INFINITY_LIFE_TIME,
3146 .preferred_lft = INFINITY_LIFE_TIME,
3147 .scope = IFA_LINK
3148 };
8e5e8f30 3149 struct inet6_ifaddr *ifp;
95c385b4
NH		 3150
3151#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 3152 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3153 idev->cnf.optimistic_dad) &&
702beb87 3154 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
e6464b8c 3155 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
95c385b4 3156#endif
1da177e4 3157
e6464b8c 3158 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
1da177e4 3159 if (!IS_ERR(ifp)) {
8308f3ff 3160 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
acb54e3c 3161 0, 0, GFP_ATOMIC);
cf22f9a2 3162 addrconf_dad_start(ifp);
1da177e4
LT		 3163 in6_ifa_put(ifp);
3164 }
3165}
2ad3ed59 3166EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
1da177e4 3167
622c81d5
HFS		 3168static bool ipv6_reserved_interfaceid(struct in6_addr address)
3169{
3170 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3171 return true;
3172
3173 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3174 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3175 return true;
3176
3177 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3178 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3179 return true;
3180
3181 return false;
3182}
3183
3184static int ipv6_generate_stable_address(struct in6_addr *address,
3185 u8 dad_count,
3186 const struct inet6_dev *idev)
3187{
622c81d5
HFS		 3188 static DEFINE_SPINLOCK(lock);
3189 static __u32 digest[SHA_DIGEST_WORDS];
3190 static __u32 workspace[SHA_WORKSPACE_WORDS];
3191
3192 static union {
3193 char __data[SHA_MESSAGE_BYTES];
3194 struct {
3195 struct in6_addr secret;
ff40217e 3196 __be32 prefix[2];
622c81d5
HFS		 3197 unsigned char hwaddr[MAX_ADDR_LEN];
3198 u8 dad_count;
3199 } __packed;
3200 } data;
3201
3202 struct in6_addr secret;
3203 struct in6_addr temp;
3204 struct net *net = dev_net(idev->dev);
3205
3206 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3207
3208 if (idev->cnf.stable_secret.initialized)
3209 secret = idev->cnf.stable_secret.secret;
3210 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3211 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3212 else
3213 return -1;
3214
3215retry:
3216 spin_lock_bh(&lock);
3217
3218 sha_init(digest);
3219 memset(&data, 0, sizeof(data));
3220 memset(workspace, 0, sizeof(workspace));
3221 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3222 data.prefix[0] = address->s6_addr32[0];
3223 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3224 data.secret = secret;
3225 data.dad_count = dad_count;
3226
3227 sha_transform(digest, data.__data, workspace);
3228
3229 temp = *address;
ff40217e
HFS		 3230 temp.s6_addr32[2] = (__force __be32)digest[0];
3231 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3232
3233 spin_unlock_bh(&lock);
3234
3235 if (ipv6_reserved_interfaceid(temp)) {
3236 dad_count++;
1855b7c3 3237 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3238 return -1;
3239 goto retry;
3240 }
3241
3242 *address = temp;
3243 return 0;
3244}
3245
cc9da6cc
BM		 3246static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3247{
3248 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3249
3250 if (s->initialized)
3251 return;
3252 s = &idev->cnf.stable_secret;
3253 get_random_bytes(&s->secret, sizeof(s->secret));
3254 s->initialized = true;
3255}
3256
bc91b0f0
JP		 3257static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3258{
622c81d5
HFS		 3259 struct in6_addr addr;
3260
ca254490
DA		 3261 /* no link local addresses on L3 master devices */
3262 if (netif_is_l3_master(idev->dev))
3263 return;
3264
744fdc82
JW		 3265 /* no link local addresses on devices flagged as slaves */
3266 if (idev->dev->flags & IFF_SLAVE)
3267 return;
3268
622c81d5 3269 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3270
d35a00b8 3271 switch (idev->cnf.addr_gen_mode) {
cc9da6cc
BM		 3272 case IN6_ADDR_GEN_MODE_RANDOM:
3273 ipv6_gen_mode_random_init(idev);
a8eceea8 3274 fallthrough;
cc9da6cc 3275 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3276 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3277 addrconf_add_linklocal(idev, &addr,
3278 IFA_F_STABLE_PRIVACY);
622c81d5 3279 else if (prefix_route)
8308f3ff 3280 addrconf_prefix_route(&addr, 64, 0, idev->dev,
acb54e3c 3281 0, 0, GFP_KERNEL);
cc9da6cc
BM		 3282 break;
3283 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3284 /* addrconf_add_linklocal also adds a prefix_route and we
3285 * only need to care about prefix routes if ipv6_generate_eui64
3286 * couldn't generate one.
3287 */
3288 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3289 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0 3290 else if (prefix_route)
8308f3ff 3291 addrconf_prefix_route(&addr, 64, 0, idev->dev,
27b10608 3292 0, 0, GFP_KERNEL);
cc9da6cc
BM		 3293 break;
3294 case IN6_ADDR_GEN_MODE_NONE:
3295 default:
3296 /* will not add any link local address */
3297 break;
bc91b0f0
JP		 3298 }
3299}
3300
1da177e4
LT		 3301static void addrconf_dev_config(struct net_device *dev)
3302{
8e5e8f30 3303 struct inet6_dev *idev;
1da177e4
LT		 3304
3305 ASSERT_RTNL();
3306
74235a25
HX		 3307 if ((dev->type != ARPHRD_ETHER) &&
3308 (dev->type != ARPHRD_FDDI) &&
74235a25 3309 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3310 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3311 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3312 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc 3313 (dev->type != ARPHRD_6LOWPAN) &&
45ce0fd1
FJ		 3314 (dev->type != ARPHRD_IP6GRE) &&
3315 (dev->type != ARPHRD_IPGRE) &&
3316 (dev->type != ARPHRD_TUNNEL) &&
9deb441c
SAK		 3317 (dev->type != ARPHRD_NONE) &&
3318 (dev->type != ARPHRD_RAWIP)) {
74235a25 3319 /* Alas, we support only Ethernet autoconfiguration. */
60380488
HL		 3320 idev = __in6_dev_get(dev);
3321 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3322 dev->flags & IFF_MULTICAST)
3323 ipv6_mc_up(idev);
74235a25
HX		 3324 return;
3325 }
3326
1da177e4 3327 idev = addrconf_add_dev(dev);
64e724f6 3328 if (IS_ERR(idev))
1da177e4
LT		 3329 return;
3330
cc9da6cc
BM		 3331 /* this device type has no EUI support */
3332 if (dev->type == ARPHRD_NONE &&
d35a00b8
FJ		 3333 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3334 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc 3335
bc91b0f0 3336 addrconf_addr_gen(idev, false);
1da177e4
LT		 3337}
3338
07a93626 3339#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3340static void addrconf_sit_config(struct net_device *dev)
3341{
3342 struct inet6_dev *idev;
3343
3344 ASSERT_RTNL();
3345
1ab1457c
YH		 3346 /*
3347 * Configure the tunnel with one of our IPv4
3348 * addresses... we should configure all of
1da177e4
LT		 3349 * our v4 addrs in the tunnel
3350 */
3351
e5d08d71 3352 idev = ipv6_find_idev(dev);
db0b99f5 3353 if (IS_ERR(idev)) {
91df42be 3354 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3355 return;
3356 }
3357
c7dc89c0 3358 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3359 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3360 return;
3361 }
3362
1da177e4
LT		 3363 sit_add_v4_addrs(idev);
3364
62b54dd9 3365 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3366 addrconf_add_mroute(dev);
1da177e4 3367}
0be669bb 3368#endif
1da177e4 3369
07a93626 3370#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3371static void addrconf_gre_config(struct net_device *dev)
3372{
3373 struct inet6_dev *idev;
aee80b54 3374
aee80b54 3375 ASSERT_RTNL();
3376
e5d08d71 3377 idev = ipv6_find_idev(dev);
db0b99f5 3378 if (IS_ERR(idev)) {
91df42be 3379 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3380 return;
3381 }
3382
bc91b0f0 3383 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3384 if (dev->flags & IFF_POINTOPOINT)
3385 addrconf_add_mroute(dev);
aee80b54 3386}
3387#endif
3388
afb1d4b5
DA		 3389static int fixup_permanent_addr(struct net *net,
3390 struct inet6_dev *idev,
f1705ec1
DA		 3391 struct inet6_ifaddr *ifp)
3392{
93c2fb25 3393 /* !fib6_node means the host route was removed from the
8048ced9
DA		 3394 * FIB, for example, if 'lo' device is taken down. In that
3395 * case regenerate the host route.
3396 */
93c2fb25 3397 if (!ifp->rt || !ifp->rt->fib6_node) {
360a9887 3398 struct fib6_info *f6i, *prev;
f1705ec1 3399
360a9887
DA		 3400 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3401 GFP_ATOMIC);
3402 if (IS_ERR(f6i))
3403 return PTR_ERR(f6i);
f1705ec1 3404
8048ced9
DA		 3405 /* ifp->rt can be accessed outside of rtnl */
3406 spin_lock(&ifp->lock);
3407 prev = ifp->rt;
360a9887 3408 ifp->rt = f6i;
8048ced9
DA		 3409 spin_unlock(&ifp->lock);
3410
93531c67 3411 fib6_info_release(prev);
f1705ec1
DA		 3412 }
3413
3414 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3415 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
8308f3ff
DA		 3416 ifp->rt_priority, idev->dev, 0, 0,
3417 GFP_ATOMIC);
f1705ec1
DA		 3418 }
3419
6d717134
DA		 3420 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3421 addrconf_dad_start(ifp);
f1705ec1
DA		 3422
3423 return 0;
3424}
3425
afb1d4b5 3426static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
f1705ec1
DA		 3427{
3428 struct inet6_ifaddr *ifp, *tmp;
3429 struct inet6_dev *idev;
3430
3431 idev = __in6_dev_get(dev);
3432 if (!idev)
3433 return;
3434
3435 write_lock_bh(&idev->lock);
3436
3437 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3438 if ((ifp->flags & IFA_F_PERMANENT) &&
afb1d4b5 3439 fixup_permanent_addr(net, idev, ifp) < 0) {
f1705ec1 3440 write_unlock_bh(&idev->lock);
e669b869 3441 in6_ifa_hold(ifp);
f1705ec1
DA		 3442 ipv6_del_addr(ifp);
3443 write_lock_bh(&idev->lock);
3444
3445 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3446 idev->dev->name, &ifp->addr);
3447 }
3448 }
3449
3450 write_unlock_bh(&idev->lock);
3451}
3452
1ab1457c 3453static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3454 void *ptr)
1da177e4 3455{
351638e7 3456 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
896585d4 3457 struct netdev_notifier_change_info *change_info;
4f7f34ea 3458 struct netdev_notifier_changeupper_info *info;
748e2d93 3459 struct inet6_dev *idev = __in6_dev_get(dev);
60abc0be 3460 struct net *net = dev_net(dev);
c5e33bdd 3461 int run_pending = 0;
b217d616 3462 int err;
1da177e4 3463
e21e8467 3464 switch (event) {
45ba9dd2 3465 case NETDEV_REGISTER:
74235a25 3466 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3467 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3468 if (IS_ERR(idev))
3469 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3470 }
3471 break;
bcdd553f 3472
b7b0b1d2
AD		 3473 case NETDEV_CHANGEMTU:
3474 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3475 if (dev->mtu < IPV6_MIN_MTU) {
60abc0be 3476 addrconf_ifdown(dev, dev != net->loopback_dev);
b7b0b1d2
AD		 3477 break;
3478 }
3479
3480 if (idev) {
3481 rt6_mtu_change(dev, dev->mtu);
3482 idev->cnf.mtu6 = dev->mtu;
3483 break;
3484 }
3485
3486 /* allocate new idev */
3487 idev = ipv6_add_dev(dev);
3488 if (IS_ERR(idev))
3489 break;
3490
3491 /* device is still not ready */
3492 if (!(idev->if_flags & IF_READY))
3493 break;
3494
3495 run_pending = 1;
a8eceea8 3496 fallthrough;
1da177e4 3497 case NETDEV_UP:
3c21edbd 3498 case NETDEV_CHANGE:
c2edacf8
JV		 3499 if (dev->flags & IFF_SLAVE)
3500 break;
3501
3ce62a84
WC		 3502 if (idev && idev->cnf.disable_ipv6)
3503 break;
3504
3c21edbd 3505 if (event == NETDEV_UP) {
38bd10c4 3506 /* restore routes for permanent addresses */
afb1d4b5 3507 addrconf_permanent_addr(net, dev);
38bd10c4 3508
1f372c7b 3509 if (!addrconf_link_ready(dev)) {
3c21edbd 3510 /* device is not ready yet. */
7c62b8dd
LR		 3511 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3512 dev->name);
3c21edbd
YH		 3513 break;
3514 }
99081049 3515
d31c7b8f
EP		 3516 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3517 idev = ipv6_add_dev(dev);
3518
a317a2f1 3519 if (!IS_ERR_OR_NULL(idev)) {
99081049 3520 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3521 run_pending = 1;
3522 }
b7b0b1d2 3523 } else if (event == NETDEV_CHANGE) {
1f372c7b 3524 if (!addrconf_link_ready(dev)) {
3c21edbd 3525 /* device is still not ready. */
27c6fa73 3526 rt6_sync_down_dev(dev, event);
3c21edbd
YH		 3527 break;
3528 }
3529
896585d4 3530 if (!IS_ERR_OR_NULL(idev)) {
a088d1d7
LL		 3531 if (idev->if_flags & IF_READY) {
3532 /* device is already configured -
3533 * but resend MLD reports, we might
3534 * have roamed and need to update
3535 * multicast snooping switches
3536 */
3537 ipv6_mc_up(idev);
896585d4
HL		 3538 change_info = ptr;
3539 if (change_info->flags_changed & IFF_NOARP)
3540 addrconf_dad_run(idev, true);
27c6fa73 3541 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3c21edbd 3542 break;
a088d1d7 3543 }
3c21edbd
YH		 3544 idev->if_flags |= IF_READY;
3545 }
3546
f3213831
JP		 3547 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3548 dev->name);
3c21edbd 3549
c5e33bdd 3550 run_pending = 1;
3c21edbd
YH		 3551 }
3552
e21e8467 3553 switch (dev->type) {
07a93626 3554#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3555 case ARPHRD_SIT:
3556 addrconf_sit_config(dev);
3557 break;
aee80b54 3558#endif
07a93626 3559#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3560 case ARPHRD_IPGRE:
3561 addrconf_gre_config(dev);
3562 break;
0be669bb 3563#endif
1da177e4
LT		 3564 case ARPHRD_LOOPBACK:
3565 init_loopback(dev);
3566 break;
3567
3568 default:
3569 addrconf_dev_config(dev);
3570 break;
3ff50b79 3571 }
bcdd553f 3572
a317a2f1 3573 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd 3574 if (run_pending)
896585d4 3575 addrconf_dad_run(idev, false);
c5e33bdd 3576
2127d95a
IS		 3577 /* Device has an address by now */
3578 rt6_sync_up(dev, RTNH_F_DEAD);
3579
bcdd553f
SH		 3580 /*
3581 * If the MTU changed during the interface down,
3582 * when the interface up, the changed MTU must be
3583 * reflected in the idev as well as routers.
1da177e4 3584 */
bcdd553f
SH		 3585 if (idev->cnf.mtu6 != dev->mtu &&
3586 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3587 rt6_mtu_change(dev, dev->mtu);
3588 idev->cnf.mtu6 = dev->mtu;
3589 }
3590 idev->tstamp = jiffies;
3591 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3592
3593 /*
3594 * If the changed mtu during down is lower than
3595 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3596 */
3597 if (dev->mtu < IPV6_MIN_MTU)
60abc0be 3598 addrconf_ifdown(dev, dev != net->loopback_dev);
1da177e4
LT		 3599 }
3600 break;
3601
1da177e4
LT		 3602 case NETDEV_DOWN:
3603 case NETDEV_UNREGISTER:
3604 /*
3605 * Remove all addresses from this interface.
3606 */
3607 addrconf_ifdown(dev, event != NETDEV_DOWN);
3608 break;
3c21edbd 3609
1da177e4 3610 case NETDEV_CHANGENAME:
1da177e4 3611 if (idev) {
5632c515 3612 snmp6_unregister_dev(idev);
408c4768 3613 addrconf_sysctl_unregister(idev);
a317a2f1 3614 err = addrconf_sysctl_register(idev);
b217d616
HX		 3615 if (err)
3616 return notifier_from_errno(err);
a317a2f1
WC		 3617 err = snmp6_register_dev(idev);
3618 if (err) {
3619 addrconf_sysctl_unregister(idev);
3620 return notifier_from_errno(err);
3621 }
5632c515 3622 }
1da177e4 3623 break;
bcdd553f 3624
93d9b7d7
JP		 3625 case NETDEV_PRE_TYPE_CHANGE:
3626 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3627 if (idev)
3628 addrconf_type_change(dev, event);
75c78500 3629 break;
4f7f34ea
DA		 3630
3631 case NETDEV_CHANGEUPPER:
3632 info = ptr;
3633
3634 /* flush all routes if dev is linked to or unlinked from
3635 * an L3 master device (e.g., VRF)
3636 */
3637 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3638 addrconf_ifdown(dev, 0);
3ff50b79 3639 }
1da177e4
LT		 3640
3641 return NOTIFY_OK;
3642}
3643
3644/*
3645 * addrconf module should be notified of a device going up
3646 */
3647static struct notifier_block ipv6_dev_notf = {
3648 .notifier_call = addrconf_notify,
242d3a49 3649 .priority = ADDRCONF_NOTIFY_PRIORITY,
1da177e4
LT		 3650};
3651
93d9b7d7 3652static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3653{
3654 struct inet6_dev *idev;
3655 ASSERT_RTNL();
3656
3657 idev = __in6_dev_get(dev);
3658
93d9b7d7 3659 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3660 ipv6_mc_remap(idev);
93d9b7d7 3661 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3662 ipv6_mc_unmap(idev);
3663}
3664
70af921d
DA		 3665static bool addr_is_local(const struct in6_addr *addr)
3666{
3667 return ipv6_addr_type(addr) &
3668 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3669}
3670
1da177e4
LT		 3671static int addrconf_ifdown(struct net_device *dev, int how)
3672{
4c981e28 3673 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN;
c346dca1 3674 struct net *net = dev_net(dev);
502a2ffd 3675 struct inet6_dev *idev;
f1705ec1 3676 struct inet6_ifaddr *ifa, *tmp;
0aef78aa 3677 bool keep_addr = false;
73a8bd74 3678 int state, i;
1da177e4
LT		 3679
3680 ASSERT_RTNL();
3681
4c981e28 3682 rt6_disable_ip(dev, event);
1da177e4
LT		 3683
3684 idev = __in6_dev_get(dev);
63159f29 3685 if (!idev)
1da177e4
LT		 3686 return -ENODEV;
3687
bcdd553f
SH		 3688 /*
3689 * Step 1: remove reference to ipv6 device from parent device.
3690 * Do not dev_put!
1da177e4 3691 */
439e2385 3692 if (how) {
1da177e4 3693 idev->dead = 1;
8814c4b5
YH		 3694
3695 /* protected by rtnl_lock */
a9b3cd7f 3696 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3697
3698 /* Step 1.5: remove snmp6 entry */
3699 snmp6_unregister_dev(idev);
3700
3701 }
3702
f1705ec1
DA		 3703 /* combine the user config with event to determine if permanent
3704 * addresses are to be removed from address hash table
3705 */
0aef78aa
IV		 3706 if (!how && !idev->cnf.disable_ipv6) {
3707 /* aggregate the system setting and interface setting */
3708 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3709
3710 if (!_keep_addr)
3711 _keep_addr = idev->cnf.keep_addr_on_down;
3712
3713 keep_addr = (_keep_addr > 0);
3714 }
f1705ec1 3715
73a8bd74
DM		 3716 /* Step 2: clear hash table */
3717 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3718 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3719
3720 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3721restart:
b67bfe0d 3722 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3723 if (ifa->idev == idev) {
c15b1cca 3724 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3725 /* combined flag + permanent flag decide if
3726 * address is retained on a down event
3727 */
3728 if (!keep_addr ||
70af921d
DA		 3729 !(ifa->flags & IFA_F_PERMANENT) ||
3730 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3731 hlist_del_init_rcu(&ifa->addr_lst);
3732 goto restart;
3733 }
73a8bd74
DM		 3734 }
3735 }
3736 spin_unlock_bh(&addrconf_hash_lock);
3737 }
3738
1da177e4
LT		 3739 write_lock_bh(&idev->lock);
3740
b7b1bfce
HFS		 3741 addrconf_del_rs_timer(idev);
3742
bcdd553f 3743 /* Step 2: clear flags for stateless addrconf */
439e2385 3744 if (!how)
3c21edbd 3745 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3746
bcdd553f 3747 /* Step 3: clear tempaddr list */
372e6c8f 3748 while (!list_empty(&idev->tempaddr_list)) {
3749 ifa = list_first_entry(&idev->tempaddr_list,
3750 struct inet6_ifaddr, tmp_list);
3751 list_del(&ifa->tmp_list);
1da177e4
LT		 3752 write_unlock_bh(&idev->lock);
3753 spin_lock_bh(&ifa->lock);
3754
3755 if (ifa->ifpub) {
3756 in6_ifa_put(ifa->ifpub);
3757 ifa->ifpub = NULL;
3758 }
3759 spin_unlock_bh(&ifa->lock);
3760 in6_ifa_put(ifa);
3761 write_lock_bh(&idev->lock);
3762 }
8f37ada5 3763
f1705ec1 3764 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
8d1c802b 3765 struct fib6_info *rt = NULL;
a2d6cbb0 3766 bool keep;
38bd10c4 3767
f1705ec1 3768 addrconf_del_dad_work(ifa);
84e8b803 3769
a2d6cbb0
RV		 3770 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3771 !addr_is_local(&ifa->addr);
a2d6cbb0 3772
73a8bd74 3773 write_unlock_bh(&idev->lock);
8e8e676d 3774 spin_lock_bh(&ifa->lock);
f1705ec1 3775
a2d6cbb0 3776 if (keep) {
f1705ec1
DA		 3777 /* set state to skip the notifier below */
3778 state = INET6_IFADDR_STATE_DEAD;
6d717134 3779 ifa->state = INET6_IFADDR_STATE_PREDAD;
f1705ec1
DA		 3780 if (!(ifa->flags & IFA_F_NODAD))
3781 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3782
3783 rt = ifa->rt;
3784 ifa->rt = NULL;
f1705ec1
DA		 3785 } else {
3786 state = ifa->state;
3787 ifa->state = INET6_IFADDR_STATE_DEAD;
f1705ec1
DA		 3788 }
3789
8e8e676d 3790 spin_unlock_bh(&ifa->lock);
9d82ca98 3791
38bd10c4 3792 if (rt)
11dd74b3 3793 ip6_del_rt(net, rt, false);
38bd10c4 3794
73a8bd74
DM		 3795 if (state != INET6_IFADDR_STATE_DEAD) {
3796 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3797 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
ea06f717
MM		 3798 } else {
3799 if (idev->cnf.forwarding)
3800 addrconf_leave_anycast(ifa);
3801 addrconf_leave_solict(ifa->idev, &ifa->addr);
27bdb2ab 3802 }
8f37ada5 3803
73a8bd74 3804 write_lock_bh(&idev->lock);
8ef802aa
ED		 3805 if (!keep) {
3806 list_del_rcu(&ifa->if_list);
3807 in6_ifa_put(ifa);
3808 }
73a8bd74 3809 }
8f37ada5 3810
1da177e4
LT		 3811 write_unlock_bh(&idev->lock);
3812
381f4dca
SD		 3813 /* Step 5: Discard anycast and multicast list */
3814 if (how) {
3815 ipv6_ac_destroy_dev(idev);
1da177e4 3816 ipv6_mc_destroy_dev(idev);
381f4dca 3817 } else {
1da177e4 3818 ipv6_mc_down(idev);
381f4dca 3819 }
1da177e4 3820
1da177e4 3821 idev->tstamp = jiffies;
1ab1457c 3822
bcdd553f 3823 /* Last: Shot the device (if unregistered) */
439e2385 3824 if (how) {
408c4768 3825 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3826 neigh_parms_release(&nd_tbl, idev->nd_parms);
3827 neigh_ifdown(&nd_tbl, dev);
3828 in6_dev_put(idev);
3829 }
3830 return 0;
3831}
3832
e99e88a9 3833static void addrconf_rs_timer(struct timer_list *t)
1da177e4 3834{
e99e88a9 3835 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
caf92bc4 3836 struct net_device *dev = idev->dev;
b7b1bfce 3837 struct in6_addr lladdr;
1da177e4 3838
b7b1bfce 3839 write_lock(&idev->lock);
5b2a1953 3840 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3841 goto out;
3842
9ba2add3 3843 if (!ipv6_accept_ra(idev))
5b2a1953 3844 goto out;
3845
3846 /* Announcement received after solicitation was sent */
3847 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3848 goto out;
1da177e4 3849
bd11f074 3850 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
caf92bc4
CW		 3851 write_unlock(&idev->lock);
3852 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3853 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3854 &in6addr_linklocal_allrouters);
3855 else
caf92bc4 3856 goto put;
1da177e4 3857
caf92bc4 3858 write_lock(&idev->lock);
bd11f074
MŻ		 3859 idev->rs_interval = rfc3315_s14_backoff_update(
3860 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
b7b1bfce
HFS		 3861 /* The wait after the last probe can be shorter */
3862 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3863 idev->cnf.rtr_solicits) ?
3864 idev->cnf.rtr_solicit_delay :
bd11f074 3865 idev->rs_interval);
1da177e4 3866 } else {
1da177e4
LT		 3867 /*
3868 * Note: we do not support deprecated "all on-link"
3869 * assumption any longer.
3870 */
91df42be 3871 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3872 }
3873
3874out:
b7b1bfce 3875 write_unlock(&idev->lock);
caf92bc4 3876put:
b7b1bfce 3877 in6_dev_put(idev);
1da177e4
LT		 3878}
3879
3880/*
3881 * Duplicate Address Detection
3882 */
3c21edbd
YH		 3883static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3884{
3885 unsigned long rand_num;
3886 struct inet6_dev *idev = ifp->idev;
adc176c5 3887 u64 nonce;
3c21edbd 3888
95c385b4
NH		 3889 if (ifp->flags & IFA_F_OPTIMISTIC)
3890 rand_num = 0;
3891 else
63862b5b 3892 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3893
adc176c5
EN		 3894 nonce = 0;
3895 if (idev->cnf.enhanced_dad ||
3896 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3897 do
3898 get_random_bytes(&nonce, 6);
3899 while (nonce == 0);
3900 }
3901 ifp->dad_nonce = nonce;
b7b1bfce 3902 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3903 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3904}
3905
c15b1cca 3906static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3907{
3908 struct inet6_dev *idev = ifp->idev;
3909 struct net_device *dev = idev->dev;
764d3be6 3910 bool bump_id, notify = false;
afb1d4b5 3911 struct net *net;
1da177e4
LT		 3912
3913 addrconf_join_solict(dev, &ifp->addr);
3914
63862b5b 3915 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3916
3917 read_lock_bh(&idev->lock);
622ccdf1 3918 spin_lock(&ifp->lock);
e9d3e084 3919 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3920 goto out;
1da177e4 3921
afb1d4b5 3922 net = dev_net(dev);
1da177e4 3923 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
afb1d4b5 3924 (net->ipv6.devconf_all->accept_dad < 1 &&
a2d3f3e3 3925 idev->cnf.accept_dad < 1) ||
55ebaef1
NT		 3926 !(ifp->flags&IFA_F_TENTATIVE) ||
3927 ifp->flags & IFA_F_NODAD) {
c76fe2d9
DA		 3928 bool send_na = false;
3929
3930 if (ifp->flags & IFA_F_TENTATIVE &&
3931 !(ifp->flags & IFA_F_OPTIMISTIC))
3932 send_na = true;
764d3be6 3933 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3934 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3935 spin_unlock(&ifp->lock);
1da177e4
LT		 3936 read_unlock_bh(&idev->lock);
3937
c76fe2d9 3938 addrconf_dad_completed(ifp, bump_id, send_na);
1da177e4
LT		 3939 return;
3940 }
3941
6732bade 3942 if (!(idev->if_flags & IF_READY)) {
21809faf 3943 spin_unlock(&ifp->lock);
6732bade 3944 read_unlock_bh(&idev->lock);
3c21edbd 3945 /*
590a9887 3946 * If the device is not ready:
3c21edbd
YH		 3947 * - keep it tentative if it is a permanent address.
3948 * - otherwise, kill it.
3949 */
3950 in6_ifa_hold(ifp);
cc411d0b 3951 addrconf_dad_stop(ifp, 0);
6732bade 3952 return;
3c21edbd 3953 }
95c385b4
NH		 3954
3955 /*
3956 * Optimistic nodes can start receiving
3957 * Frames right away
3958 */
7fd2561e 3959 if (ifp->flags & IFA_F_OPTIMISTIC) {
afb1d4b5
DA		 3960 ip6_ins_rt(net, ifp->rt);
3961 if (ipv6_use_optimistic_addr(net, idev)) {
7fd2561e
EK		 3962 /* Because optimistic nodes can use this address,
3963 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3964 */
16186a82 3965 notify = true;
7fd2561e
EK		 3966 }
3967 }
95c385b4 3968
6732bade 3969 addrconf_dad_kick(ifp);
1da177e4 3970out:
622ccdf1 3971 spin_unlock(&ifp->lock);
1da177e4 3972 read_unlock_bh(&idev->lock);
16186a82 3973 if (notify)
3974 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 3975}
3976
c15b1cca 3977static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3978{
c15b1cca
HFS		 3979 bool begin_dad = false;
3980
8e8e676d 3981 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3982 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3983 ifp->state = INET6_IFADDR_STATE_PREDAD;
3984 begin_dad = true;
3985 }
8e8e676d 3986 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3987
3988 if (begin_dad)
3989 addrconf_mod_dad_work(ifp, 0);
3990}
3991
3992static void addrconf_dad_work(struct work_struct *w)
3993{
3994 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3995 struct inet6_ifaddr,
3996 dad_work);
1da177e4 3997 struct inet6_dev *idev = ifp->idev;
764d3be6 3998 bool bump_id, disable_ipv6 = false;
1da177e4
LT		 3999 struct in6_addr mcaddr;
4000
c15b1cca
HFS		 4001 enum {
4002 DAD_PROCESS,
4003 DAD_BEGIN,
4004 DAD_ABORT,
4005 } action = DAD_PROCESS;
4006
4007 rtnl_lock();
4008
8e8e676d 4009 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 4010 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4011 action = DAD_BEGIN;
4012 ifp->state = INET6_IFADDR_STATE_DAD;
4013 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4014 action = DAD_ABORT;
4015 ifp->state = INET6_IFADDR_STATE_POSTDAD;
85b51b12 4016
35e015e1
MC		 4017 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4018 idev->cnf.accept_dad > 1) &&
4019 !idev->cnf.disable_ipv6 &&
85b51b12
MM		 4020 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4021 struct in6_addr addr;
4022
4023 addr.s6_addr32[0] = htonl(0xfe800000);
4024 addr.s6_addr32[1] = 0;
4025
4026 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4027 ipv6_addr_equal(&ifp->addr, &addr)) {
4028 /* DAD failed for link-local based on MAC */
4029 idev->cnf.disable_ipv6 = 1;
4030
4031 pr_info("%s: IPv6 being disabled!\n",
4032 ifp->idev->dev->name);
4033 disable_ipv6 = true;
4034 }
4035 }
c15b1cca 4036 }
8e8e676d 4037 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 4038
4039 if (action == DAD_BEGIN) {
4040 addrconf_dad_begin(ifp);
4041 goto out;
4042 } else if (action == DAD_ABORT) {
751eb6b6 4043 in6_ifa_hold(ifp);
c15b1cca 4044 addrconf_dad_stop(ifp, 1);
85b51b12
MM		 4045 if (disable_ipv6)
4046 addrconf_ifdown(idev->dev, 0);
c15b1cca
HFS		 4047 goto out;
4048 }
4049
b7b1bfce 4050 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 4051 goto out;
4052
c15b1cca 4053 write_lock_bh(&idev->lock);
122e4519 4054 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 4055 write_unlock_bh(&idev->lock);
1da177e4
LT		 4056 goto out;
4057 }
21809faf 4058
4059 spin_lock(&ifp->lock);
622ccdf1
HX		 4060 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4061 spin_unlock(&ifp->lock);
c15b1cca 4062 write_unlock_bh(&idev->lock);
622ccdf1
HX		 4063 goto out;
4064 }
4065
b7b1bfce 4066 if (ifp->dad_probes == 0) {
c76fe2d9
DA		 4067 bool send_na = false;
4068
1da177e4
LT		 4069 /*
4070 * DAD was successful
4071 */
4072
c76fe2d9
DA		 4073 if (ifp->flags & IFA_F_TENTATIVE &&
4074 !(ifp->flags & IFA_F_OPTIMISTIC))
4075 send_na = true;
764d3be6 4076 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 4077 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 4078 spin_unlock(&ifp->lock);
c15b1cca 4079 write_unlock_bh(&idev->lock);
1da177e4 4080
c76fe2d9 4081 addrconf_dad_completed(ifp, bump_id, send_na);
1da177e4
LT		 4082
4083 goto out;
4084 }
4085
b7b1bfce 4086 ifp->dad_probes--;
c15b1cca 4087 addrconf_mod_dad_work(ifp,
19e16d22
HL		 4088 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4089 HZ/100));
21809faf 4090 spin_unlock(&ifp->lock);
c15b1cca 4091 write_unlock_bh(&idev->lock);
1da177e4
LT		 4092
4093 /* send a neighbour solicitation for our addr */
1da177e4 4094 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
adc176c5
EN		 4095 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4096 ifp->dad_nonce);
1da177e4
LT		 4097out:
4098 in6_ifa_put(ifp);
c15b1cca 4099 rtnl_unlock();
1da177e4
LT		 4100}
4101
11ffff75
HFS		 4102/* ifp->idev must be at least read locked */
4103static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4104{
4105 struct inet6_ifaddr *ifpiter;
4106 struct inet6_dev *idev = ifp->idev;
4107
602582ca
HFS		 4108 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4109 if (ifpiter->scope > IFA_LINK)
4110 break;
11ffff75
HFS		 4111 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4112 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4113 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4114 IFA_F_PERMANENT)
4115 return false;
4116 }
4117 return true;
4118}
4119
c76fe2d9
DA		 4120static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4121 bool send_na)
1da177e4 4122{
e21e8467 4123 struct net_device *dev = ifp->idev->dev;
b7b1bfce 4124 struct in6_addr lladdr;
b173ee48 4125 bool send_rs, send_mld;
b7b1bfce 4126
c15b1cca 4127 addrconf_del_dad_work(ifp);
1da177e4
LT		 4128
4129 /*
4130 * Configure the address for reception. Now it is valid.
4131 */
4132
4133 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4134
026359bc
TA		 4135 /* If added prefix is link local and we are prepared to process
4136 router advertisements, start sending router solicitations.
1da177e4
LT		 4137 */
4138
1ec047eb 4139 read_lock_bh(&ifp->idev->lock);
11ffff75 4140 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 4141 send_rs = send_mld &&
4142 ipv6_accept_ra(ifp->idev) &&
bd11f074 4143 ifp->idev->cnf.rtr_solicits != 0 &&
b173ee48 4144 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 4145 read_unlock_bh(&ifp->idev->lock);
4146
b173ee48
HFS		 4147 /* While dad is in progress mld report's source address is in6_addrany.
4148 * Resend with proper ll now.
4149 */
4150 if (send_mld)
4151 ipv6_mc_dad_complete(ifp->idev);
4152
c76fe2d9
DA		 4153 /* send unsolicited NA if enabled */
4154 if (send_na &&
4155 (ifp->idev->cnf.ndisc_notify ||
4156 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4157 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4158 /*router=*/ !!ifp->idev->cnf.forwarding,
4159 /*solicited=*/ false, /*override=*/ true,
4160 /*inc_opt=*/ true);
4161 }
4162
1ec047eb 4163 if (send_rs) {
1da177e4
LT		 4164 /*
4165 * If a host as already performed a random delay
4166 * [...] as part of DAD [...] there is no need
4167 * to delay again before sending the first RS
4168 */
1ec047eb 4169 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 4170 return;
1ec047eb 4171 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 4172
b7b1bfce
HFS		 4173 write_lock_bh(&ifp->idev->lock);
4174 spin_lock(&ifp->lock);
bd11f074
MŻ		 4175 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4176 ifp->idev->cnf.rtr_solicit_interval);
b7b1bfce 4177 ifp->idev->rs_probes = 1;
1da177e4 4178 ifp->idev->if_flags |= IF_RS_SENT;
bd11f074 4179 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
b7b1bfce
HFS		 4180 spin_unlock(&ifp->lock);
4181 write_unlock_bh(&ifp->idev->lock);
1da177e4 4182 }
764d3be6
PA		 4183
4184 if (bump_id)
4185 rt_genid_bump_ipv6(dev_net(dev));
a11a7f71
MH		 4186
4187 /* Make sure that a new temporary address will be created
4188 * before this temporary address becomes deprecated.
4189 */
4190 if (ifp->flags & IFA_F_TEMPORARY)
4191 addrconf_verify_rtnl();
1da177e4
LT		 4192}
4193
896585d4 4194static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
e21e8467 4195{
c5e33bdd
YH		 4196 struct inet6_ifaddr *ifp;
4197
4198 read_lock_bh(&idev->lock);
502a2ffd 4199 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 4200 spin_lock(&ifp->lock);
896585d4
HL		 4201 if ((ifp->flags & IFA_F_TENTATIVE &&
4202 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4203 if (restart)
4204 ifp->state = INET6_IFADDR_STATE_PREDAD;
f2344a13 4205 addrconf_dad_kick(ifp);
896585d4 4206 }
21809faf 4207 spin_unlock(&ifp->lock);
c5e33bdd
YH		 4208 }
4209 read_unlock_bh(&idev->lock);
4210}
4211
1da177e4
LT		 4212#ifdef CONFIG_PROC_FS
4213struct if6_iter_state {
3c40090a 4214 struct seq_net_private p;
1da177e4 4215 int bucket;
1d578303 4216 int offset;
1da177e4
LT		 4217};
4218
1d578303 4219static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4 4220{
1da177e4 4221 struct if6_iter_state *state = seq->private;
1218854a 4222 struct net *net = seq_file_net(seq);
a5c1d98f 4223 struct inet6_ifaddr *ifa = NULL;
1d578303 4224 int p = 0;
1da177e4 4225
1d578303
MM		 4226 /* initial bucket if pos is 0 */
4227 if (pos == 0) {
4228 state->bucket = 0;
4229 state->offset = 0;
4230 }
4231
4232 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
a5c1d98f 4233 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
1d578303 4234 addr_lst) {
9f0d3c27
ED		 4235 if (!net_eq(dev_net(ifa->idev->dev), net))
4236 continue;
1d578303
MM		 4237 /* sync with offset */
4238 if (p < state->offset) {
4239 p++;
4240 continue;
4241 }
9f0d3c27 4242 return ifa;
1d578303
MM		 4243 }
4244
4245 /* prepare for next bucket */
4246 state->offset = 0;
4247 p = 0;
1da177e4 4248 }
c2e21293 4249 return NULL;
1da177e4
LT		 4250}
4251
c2e21293 4252static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4253 struct inet6_ifaddr *ifa)
1da177e4
LT		 4254{
4255 struct if6_iter_state *state = seq->private;
1218854a 4256 struct net *net = seq_file_net(seq);
1da177e4 4257
a5c1d98f 4258 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
9f0d3c27
ED		 4259 if (!net_eq(dev_net(ifa->idev->dev), net))
4260 continue;
1d578303 4261 state->offset++;
9f0d3c27 4262 return ifa;
1d578303 4263 }
3c40090a 4264
86f9bd1f 4265 state->offset = 0;
c2e21293 4266 while (++state->bucket < IN6_ADDR_HSIZE) {
a5c1d98f 4267 hlist_for_each_entry_rcu(ifa,
c2e21293 4268 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 4269 if (!net_eq(dev_net(ifa->idev->dev), net))
4270 continue;
9f0d3c27 4271 return ifa;
c2e21293 4272 }
1da177e4 4273 }
3c40090a 4274
c2e21293 4275 return NULL;
1da177e4
LT		 4276}
4277
1da177e4 4278static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
a5c1d98f 4279 __acquires(rcu)
1da177e4 4280{
a5c1d98f 4281 rcu_read_lock();
1d578303 4282 return if6_get_first(seq, *pos);
1da177e4
LT		 4283}
4284
4285static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4286{
4287 struct inet6_ifaddr *ifa;
4288
4289 ifa = if6_get_next(seq, v);
4290 ++*pos;
4291 return ifa;
4292}
4293
4294static void if6_seq_stop(struct seq_file *seq, void *v)
a5c1d98f 4295 __releases(rcu)
1da177e4 4296{
a5c1d98f 4297 rcu_read_unlock();
1da177e4
LT		 4298}
4299
4300static int if6_seq_show(struct seq_file *seq, void *v)
4301{
4302 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4303 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4304 &ifp->addr,
1da177e4
LT		 4305 ifp->idev->dev->ifindex,
4306 ifp->prefix_len,
4307 ifp->scope,
971a351c 4308 (u8) ifp->flags,
1da177e4
LT		 4309 ifp->idev->dev->name);
4310 return 0;
4311}
4312
56b3d975 4313static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4314 .start = if6_seq_start,
4315 .next = if6_seq_next,
4316 .show = if6_seq_show,
4317 .stop = if6_seq_stop,
4318};
4319
2c8c1e72 4320static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4321{
c3506372
CH		 4322 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4323 sizeof(struct if6_iter_state)))
1da177e4
LT		 4324 return -ENOMEM;
4325 return 0;
4326}
4327
2c8c1e72 4328static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4329{
ece31ffd 4330 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4331}
4332
4333static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4334 .init = if6_proc_net_init,
4335 .exit = if6_proc_net_exit,
3c40090a
DL		 4336};
4337
4338int __init if6_proc_init(void)
4339{
4340 return register_pernet_subsys(&if6_proc_net_ops);
4341}
4342
1da177e4
LT		 4343void if6_proc_exit(void)
4344{
3c40090a 4345 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4346}
4347#endif /* CONFIG_PROC_FS */
4348
07a93626 4349#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4350/* Check if address is a home address configured on any interface. */
b71d1d42 4351int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c 4352{
3f27fb23 4353 unsigned int hash = inet6_addr_hash(net, addr);
c2e21293 4354 struct inet6_ifaddr *ifp = NULL;
3f27fb23 4355 int ret = 0;
c2e21293 4356
4e5f47ab
ED		 4357 rcu_read_lock();
4358 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 4359 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 4360 continue;
caad295f 4361 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4362 (ifp->flags & IFA_F_HOMEADDRESS)) {
4363 ret = 1;
4364 break;
4365 }
4366 }
4e5f47ab 4367 rcu_read_unlock();
3b9f9a1c
NT		 4368 return ret;
4369}
4370#endif
4371
f37c6059
AA		 4372/* RFC6554 has some algorithm to avoid loops in segment routing by
4373 * checking if the segments contains any of a local interface address.
4374 *
4375 * Quote:
4376 *
4377 * To detect loops in the SRH, a router MUST determine if the SRH
4378 * includes multiple addresses assigned to any interface on that router.
4379 * If such addresses appear more than once and are separated by at least
4380 * one address not assigned to that router.
4381 */
4382int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4383 unsigned char nsegs)
4384{
4385 const struct in6_addr *addr;
4386 int i, ret = 0, found = 0;
4387 struct inet6_ifaddr *ifp;
4388 bool separated = false;
4389 unsigned int hash;
4390 bool hash_found;
4391
4392 rcu_read_lock();
4393 for (i = 0; i < nsegs; i++) {
4394 addr = &segs[i];
4395 hash = inet6_addr_hash(net, addr);
4396
4397 hash_found = false;
4398 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4399 if (!net_eq(dev_net(ifp->idev->dev), net))
4400 continue;
4401
4402 if (ipv6_addr_equal(&ifp->addr, addr)) {
4403 hash_found = true;
4404 break;
4405 }
4406 }
4407
4408 if (hash_found) {
4409 if (found > 1 && separated) {
4410 ret = 1;
4411 break;
4412 }
4413
4414 separated = false;
4415 found++;
4416 } else {
4417 separated = true;
4418 }
4419 }
4420 rcu_read_unlock();
4421
4422 return ret;
4423}
4424
1da177e4
LT		 4425/*
4426 * Periodic address status verification
4427 */
4428
c15b1cca 4429static void addrconf_verify_rtnl(void)
1da177e4 4430{
b2db7564 4431 unsigned long now, next, next_sec, next_sched;
1da177e4 4432 struct inet6_ifaddr *ifp;
1da177e4
LT		 4433 int i;
4434
c15b1cca
HFS		 4435 ASSERT_RTNL();
4436
5c578aed 4437 rcu_read_lock_bh();
1da177e4 4438 now = jiffies;
b2db7564 4439 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4440
c15b1cca 4441 cancel_delayed_work(&addr_chk_work);
1da177e4 4442
bcdd553f 4443 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4444restart:
c15b1cca 4445 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 4446 unsigned long age;
1da177e4 4447
fad8da3e
YA		 4448 /* When setting preferred_lft to a value not zero or
4449 * infinity, while valid_lft is infinity
4450 * IFA_F_PERMANENT has a non-infinity life time.
4451 */
4452 if ((ifp->flags & IFA_F_PERMANENT) &&
4453 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4454 continue;
4455
4456 spin_lock(&ifp->lock);
b2db7564
YH		 4457 /* We try to batch several events at once. */
4458 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4459
8f27ebb9
YH		 4460 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4461 age >= ifp->valid_lft) {
1da177e4
LT		 4462 spin_unlock(&ifp->lock);
4463 in6_ifa_hold(ifp);
1da177e4
LT		 4464 ipv6_del_addr(ifp);
4465 goto restart;
8f27ebb9
YH		 4466 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4467 spin_unlock(&ifp->lock);
4468 continue;
1da177e4 4469 } else if (age >= ifp->prefered_lft) {
a1ed0526 4470 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4471 int deprecate = 0;
4472
4473 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4474 deprecate = 1;
4475 ifp->flags |= IFA_F_DEPRECATED;
4476 }
4477
fad8da3e
YA		 4478 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4479 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4480 next = ifp->tstamp + ifp->valid_lft * HZ;
4481
4482 spin_unlock(&ifp->lock);
4483
4484 if (deprecate) {
4485 in6_ifa_hold(ifp);
1da177e4
LT		 4486
4487 ipv6_ifa_notify(0, ifp);
4488 in6_ifa_put(ifp);
4489 goto restart;
4490 }
1da177e4
LT		 4491 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4492 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4493 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4494 ifp->idev->cnf.dad_transmits *
19e16d22 4495 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
88949cf4 4496
1da177e4
LT		 4497 if (age >= ifp->prefered_lft - regen_advance) {
4498 struct inet6_ifaddr *ifpub = ifp->ifpub;
4499 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4500 next = ifp->tstamp + ifp->prefered_lft * HZ;
4501 if (!ifp->regen_count && ifpub) {
4502 ifp->regen_count++;
4503 in6_ifa_hold(ifp);
4504 in6_ifa_hold(ifpub);
4505 spin_unlock(&ifp->lock);
5c578aed 4506
291d809b
HY		 4507 spin_lock(&ifpub->lock);
4508 ifpub->regen_count = 0;
4509 spin_unlock(&ifpub->lock);
e64e469b 4510 rcu_read_unlock_bh();
969c5464 4511 ipv6_create_tempaddr(ifpub, true);
1da177e4
LT		 4512 in6_ifa_put(ifpub);
4513 in6_ifa_put(ifp);
e64e469b 4514 rcu_read_lock_bh();
1da177e4
LT		 4515 goto restart;
4516 }
4517 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4518 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4519 spin_unlock(&ifp->lock);
1da177e4
LT		 4520 } else {
4521 /* ifp->prefered_lft <= ifp->valid_lft */
4522 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4523 next = ifp->tstamp + ifp->prefered_lft * HZ;
4524 spin_unlock(&ifp->lock);
4525 }
4526 }
1da177e4
LT		 4527 }
4528
b2db7564
YH		 4529 next_sec = round_jiffies_up(next);
4530 next_sched = next;
4531
4532 /* If rounded timeout is accurate enough, accept it. */
4533 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4534 next_sched = next_sec;
4535
4536 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4537 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4538 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4539
e32ac250
JP		 4540 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4541 now, next, next_sec, next_sched);
c15b1cca 4542 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4543 rcu_read_unlock_bh();
1da177e4
LT		 4544}
4545
c15b1cca
HFS		 4546static void addrconf_verify_work(struct work_struct *w)
4547{
4548 rtnl_lock();
4549 addrconf_verify_rtnl();
4550 rtnl_unlock();
4551}
4552
4553static void addrconf_verify(void)
4554{
4555 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4556}
4557
caeaba79
ND		 4558static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4559 struct in6_addr **peer_pfx)
461d8837
TG		 4560{
4561 struct in6_addr *pfx = NULL;
4562
caeaba79
ND		 4563 *peer_pfx = NULL;
4564
461d8837
TG		 4565 if (addr)
4566 pfx = nla_data(addr);
4567
4568 if (local) {
4569 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4570 *peer_pfx = pfx;
4571 pfx = nla_data(local);
461d8837
TG		 4572 }
4573
4574 return pfx;
4575}
4576
ef7c79ed 4577static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4578 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4579 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4580 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4581 [IFA_FLAGS] = { .len = sizeof(u32) },
8308f3ff 4582 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
6ecf4c37 4583 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
461d8837
TG		 4584};
4585
1da177e4 4586static int
c21ef3e3
DA		 4587inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4588 struct netlink_ext_ack *extack)
1da177e4 4589{
3b1e0a65 4590 struct net *net = sock_net(skb->sk);
b933f716
TG		 4591 struct ifaddrmsg *ifm;
4592 struct nlattr *tb[IFA_MAX+1];
caeaba79 4593 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4594 u32 ifa_flags;
b933f716 4595 int err;
1da177e4 4596
8cb08174
JB		 4597 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4598 ifa_ipv6_policy, extack);
b933f716
TG		 4599 if (err < 0)
4600 return err;
4601
4602 ifm = nlmsg_data(nlh);
caeaba79 4603 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4604 if (!pfx)
1da177e4
LT		 4605 return -EINVAL;
4606
6046d5b4
HK		 4607 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4608
4609 /* We ignore other flags so far. */
4610 ifa_flags &= IFA_F_MANAGETEMPADDR;
4611
4612 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4613 ifm->ifa_prefixlen);
1da177e4
LT		 4614}
4615
8308f3ff 4616static int modify_prefix_route(struct inet6_ifaddr *ifp,
61794012
HL		 4617 unsigned long expires, u32 flags,
4618 bool modify_peer)
8308f3ff
DA		 4619{
4620 struct fib6_info *f6i;
e7c7faa9 4621 u32 prio;
8308f3ff 4622
61794012
HL		 4623 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4624 ifp->prefix_len,
2b2450ca 4625 ifp->idev->dev, 0, RTF_DEFAULT, true);
8308f3ff
DA		 4626 if (!f6i)
4627 return -ENOENT;
4628
e7c7faa9
DA		 4629 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4630 if (f6i->fib6_metric != prio) {
4631 /* delete old one */
11dd74b3 4632 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
e7c7faa9 4633
8308f3ff 4634 /* add new one */
61794012
HL		 4635 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4636 ifp->prefix_len,
8308f3ff
DA		 4637 ifp->rt_priority, ifp->idev->dev,
4638 expires, flags, GFP_KERNEL);
8308f3ff
DA		 4639 } else {
4640 if (!expires)
4641 fib6_clean_expires(f6i);
4642 else
4643 fib6_set_expires(f6i, expires);
4644
4645 fib6_info_release(f6i);
4646 }
4647
4648 return 0;
4649}
4650
d169a1f8 4651static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
081bba5b 4652{
6f704992
YH		 4653 u32 flags;
4654 clock_t expires;
4bed72e4 4655 unsigned long timeout;
53bd6749 4656 bool was_managetempaddr;
5b84efec 4657 bool had_prefixroute;
d0098e4c 4658 bool new_peer = false;
46d48046 4659
c15b1cca
HFS		 4660 ASSERT_RTNL();
4661
d169a1f8 4662 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
081bba5b
NT		 4663 return -EINVAL;
4664
d169a1f8 4665 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
53bd6749
JP		 4666 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4667 return -EINVAL;
4668
f1c02cfb 4669 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
d169a1f8 4670 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
f1c02cfb 4671
d169a1f8 4672 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4bed72e4
YH		 4673 if (addrconf_finite_timeout(timeout)) {
4674 expires = jiffies_to_clock_t(timeout * HZ);
d169a1f8 4675 cfg->valid_lft = timeout;
6f704992 4676 flags = RTF_EXPIRES;
4bed72e4
YH		 4677 } else {
4678 expires = 0;
4679 flags = 0;
d169a1f8 4680 cfg->ifa_flags |= IFA_F_PERMANENT;
6f704992 4681 }
081bba5b 4682
d169a1f8 4683 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4bed72e4
YH		 4684 if (addrconf_finite_timeout(timeout)) {
4685 if (timeout == 0)
d169a1f8
DA		 4686 cfg->ifa_flags |= IFA_F_DEPRECATED;
4687 cfg->preferred_lft = timeout;
4bed72e4 4688 }
081bba5b 4689
d0098e4c
HL		 4690 if (cfg->peer_pfx &&
4691 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4692 if (!ipv6_addr_any(&ifp->peer_addr))
4693 cleanup_prefix_route(ifp, expires, true, true);
4694 new_peer = true;
4695 }
4696
081bba5b 4697 spin_lock_bh(&ifp->lock);
53bd6749 4698 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4699 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4700 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4701 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4702 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4703 IFA_F_NOPREFIXROUTE);
d169a1f8 4704 ifp->flags |= cfg->ifa_flags;
081bba5b 4705 ifp->tstamp = jiffies;
d169a1f8
DA		 4706 ifp->valid_lft = cfg->valid_lft;
4707 ifp->prefered_lft = cfg->preferred_lft;
081bba5b 4708
8308f3ff
DA		 4709 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4710 ifp->rt_priority = cfg->rt_priority;
081bba5b 4711
d0098e4c
HL		 4712 if (new_peer)
4713 ifp->peer_addr = *cfg->peer_pfx;
4714
081bba5b
NT		 4715 spin_unlock_bh(&ifp->lock);
4716 if (!(ifp->flags&IFA_F_TENTATIVE))
4717 ipv6_ifa_notify(0, ifp);
081bba5b 4718
d169a1f8 4719 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
8308f3ff
DA		 4720 int rc = -ENOENT;
4721
4722 if (had_prefixroute)
61794012 4723 rc = modify_prefix_route(ifp, expires, flags, false);
8308f3ff
DA		 4724
4725 /* prefix route could have been deleted; if so restore it */
4726 if (rc == -ENOENT) {
4727 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4728 ifp->rt_priority, ifp->idev->dev,
4729 expires, flags, GFP_KERNEL);
4730 }
61794012
HL		 4731
4732 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4733 rc = modify_prefix_route(ifp, expires, flags, true);
4734
4735 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4736 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4737 ifp->rt_priority, ifp->idev->dev,
4738 expires, flags, GFP_KERNEL);
4739 }
5b84efec
TH		 4740 } else if (had_prefixroute) {
4741 enum cleanup_prefix_rt_t action;
4742 unsigned long rt_expires;
4743
4744 write_lock_bh(&ifp->idev->lock);
4745 action = check_cleanup_prefix_route(ifp, &rt_expires);
4746 write_unlock_bh(&ifp->idev->lock);
4747
4748 if (action != CLEANUP_PREFIX_RT_NOP) {
4749 cleanup_prefix_route(ifp, rt_expires,
d0098e4c 4750 action == CLEANUP_PREFIX_RT_DEL, false);
5b84efec 4751 }
761aac73 4752 }
53bd6749
JP		 4753
4754 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
d169a1f8
DA		 4755 if (was_managetempaddr &&
4756 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4757 cfg->valid_lft = 0;
4758 cfg->preferred_lft = 0;
4759 }
4760 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4761 cfg->preferred_lft, !was_managetempaddr,
4762 jiffies);
53bd6749
JP		 4763 }
4764
c15b1cca 4765 addrconf_verify_rtnl();
081bba5b
NT		 4766
4767 return 0;
4768}
4769
1da177e4 4770static int
c21ef3e3
DA		 4771inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4772 struct netlink_ext_ack *extack)
1da177e4 4773{
3b1e0a65 4774 struct net *net = sock_net(skb->sk);
461d8837
TG		 4775 struct ifaddrmsg *ifm;
4776 struct nlattr *tb[IFA_MAX+1];
19b1518c 4777 struct in6_addr *peer_pfx;
7198f8ce
TG		 4778 struct inet6_ifaddr *ifa;
4779 struct net_device *dev;
f1c02cfb 4780 struct inet6_dev *idev;
19b1518c 4781 struct ifa6_config cfg;
461d8837 4782 int err;
1da177e4 4783
8cb08174
JB		 4784 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4785 ifa_ipv6_policy, extack);
461d8837
TG		 4786 if (err < 0)
4787 return err;
4788
19b1518c
DA		 4789 memset(&cfg, 0, sizeof(cfg));
4790
461d8837 4791 ifm = nlmsg_data(nlh);
19b1518c
DA		 4792 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4793 if (!cfg.pfx)
1da177e4
LT		 4794 return -EINVAL;
4795
19b1518c
DA		 4796 cfg.peer_pfx = peer_pfx;
4797 cfg.plen = ifm->ifa_prefixlen;
8308f3ff
DA		 4798 if (tb[IFA_RT_PRIORITY])
4799 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4800
19b1518c
DA		 4801 cfg.valid_lft = INFINITY_LIFE_TIME;
4802 cfg.preferred_lft = INFINITY_LIFE_TIME;
4803
461d8837 4804 if (tb[IFA_CACHEINFO]) {
0778769d 4805 struct ifa_cacheinfo *ci;
461d8837
TG		 4806
4807 ci = nla_data(tb[IFA_CACHEINFO]);
19b1518c
DA		 4808 cfg.valid_lft = ci->ifa_valid;
4809 cfg.preferred_lft = ci->ifa_prefered;
0778769d
NT		 4810 }
4811
af284937 4812 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4813 if (!dev)
7198f8ce
TG		 4814 return -ENODEV;
4815
19b1518c
DA		 4816 if (tb[IFA_FLAGS])
4817 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4818 else
4819 cfg.ifa_flags = ifm->ifa_flags;
479840ff 4820
55ebaef1 4821 /* We ignore other flags so far. */
19b1518c
DA		 4822 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4823 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4824 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
f1c02cfb
SD		 4825
4826 idev = ipv6_find_idev(dev);
db0b99f5
SD		 4827 if (IS_ERR(idev))
4828 return PTR_ERR(idev);
f1c02cfb
SD		 4829
4830 if (!ipv6_allow_optimistic_dad(net, idev))
19b1518c 4831 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
f1c02cfb 4832
19b1518c
DA		 4833 if (cfg.ifa_flags & IFA_F_NODAD &&
4834 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
f1c02cfb
SD		 4835 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4836 return -EINVAL;
4837 }
55ebaef1 4838
19b1518c 4839 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
63159f29 4840 if (!ifa) {
7198f8ce
TG		 4841 /*
4842 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4843 * userspace already relies on not having to provide this.
7198f8ce 4844 */
19b1518c 4845 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
081bba5b
NT		 4846 }
4847
7198f8ce
TG		 4848 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4849 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4850 err = -EEXIST;
4851 else
d169a1f8 4852 err = inet6_addr_modify(ifa, &cfg);
7198f8ce
TG		 4853
4854 in6_ifa_put(ifa);
4855
4856 return err;
1da177e4
LT		 4857}
4858
479840ff 4859static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4860 u8 scope, int ifindex)
4861{
4862 struct ifaddrmsg *ifm;
4863
4864 ifm = nlmsg_data(nlh);
4865 ifm->ifa_family = AF_INET6;
4866 ifm->ifa_prefixlen = prefixlen;
4867 ifm->ifa_flags = flags;
4868 ifm->ifa_scope = scope;
4869 ifm->ifa_index = ifindex;
4870}
4871
85486af0
TG		 4872static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4873 unsigned long tstamp, u32 preferred, u32 valid)
4874{
4875 struct ifa_cacheinfo ci;
4876
18a31e1e
TG		 4877 ci.cstamp = cstamp_delta(cstamp);
4878 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4879 ci.ifa_prefered = preferred;
4880 ci.ifa_valid = valid;
4881
4882 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4883}
4884
101bb229
TG		 4885static inline int rt_scope(int ifa_scope)
4886{
4887 if (ifa_scope & IFA_HOST)
4888 return RT_SCOPE_HOST;
4889 else if (ifa_scope & IFA_LINK)
4890 return RT_SCOPE_LINK;
4891 else if (ifa_scope & IFA_SITE)
4892 return RT_SCOPE_SITE;
4893 else
4894 return RT_SCOPE_UNIVERSE;
4895}
4896
0ab6803b
TG		 4897static inline int inet6_ifaddr_msgsize(void)
4898{
339bf98f 4899 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4900 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4901 + nla_total_size(16) /* IFA_ADDRESS */
479840ff 4902 + nla_total_size(sizeof(struct ifa_cacheinfo))
8308f3ff
DA		 4903 + nla_total_size(4) /* IFA_FLAGS */
4904 + nla_total_size(4) /* IFA_RT_PRIORITY */;
0ab6803b 4905}
c5396a31 4906
6ba1e6e8
DA		 4907enum addr_type_t {
4908 UNICAST_ADDR,
4909 MULTICAST_ADDR,
4910 ANYCAST_ADDR,
4911};
4912
203651b6
CB		 4913struct inet6_fill_args {
4914 u32 portid;
4915 u32 seq;
4916 int event;
4917 unsigned int flags;
4918 int netnsid;
6371a71f 4919 int ifindex;
6ba1e6e8 4920 enum addr_type_t type;
203651b6
CB		 4921};
4922
1da177e4 4923static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
203651b6 4924 struct inet6_fill_args *args)
1da177e4 4925{
1da177e4 4926 struct nlmsghdr *nlh;
85486af0 4927 u32 preferred, valid;
1da177e4 4928
203651b6
CB		 4929 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4930 sizeof(struct ifaddrmsg), args->flags);
63159f29 4931 if (!nlh)
26932566 4932 return -EMSGSIZE;
0ab6803b 4933
101bb229
TG		 4934 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4935 ifa->idev->dev->ifindex);
4936
203651b6
CB		 4937 if (args->netnsid >= 0 &&
4938 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
6ecf4c37
CB		 4939 goto error;
4940
fad8da3e
YA		 4941 if (!((ifa->flags&IFA_F_PERMANENT) &&
4942 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4943 preferred = ifa->prefered_lft;
4944 valid = ifa->valid_lft;
4945 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4946 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4947 if (preferred > tval)
4948 preferred -= tval;
4949 else
4950 preferred = 0;
f56619fc
BH		 4951 if (valid != INFINITY_LIFE_TIME) {
4952 if (valid > tval)
4953 valid -= tval;
4954 else
4955 valid = 0;
4956 }
1da177e4
LT		 4957 }
4958 } else {
85486af0
TG		 4959 preferred = INFINITY_LIFE_TIME;
4960 valid = INFINITY_LIFE_TIME;
4961 }
4962
7996c799 4963 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4964 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4965 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4966 goto error;
4967 } else
930345ea 4968 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4969 goto error;
4970
8308f3ff
DA		 4971 if (ifa->rt_priority &&
4972 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
4973 goto error;
4974
caeaba79
ND		 4975 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4976 goto error;
1da177e4 4977
479840ff
JP		 4978 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4979 goto error;
4980
053c095a
JB		 4981 nlmsg_end(skb, nlh);
4982 return 0;
caeaba79
ND		 4983
4984error:
4985 nlmsg_cancel(skb, nlh);
4986 return -EMSGSIZE;
1da177e4
LT		 4987}
4988
4989static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
203651b6 4990 struct inet6_fill_args *args)
1da177e4 4991{
1da177e4 4992 struct nlmsghdr *nlh;
101bb229
TG		 4993 u8 scope = RT_SCOPE_UNIVERSE;
4994 int ifindex = ifmca->idev->dev->ifindex;
4995
4996 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4997 scope = RT_SCOPE_SITE;
1da177e4 4998
203651b6
CB		 4999 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5000 sizeof(struct ifaddrmsg), args->flags);
63159f29 5001 if (!nlh)
26932566 5002 return -EMSGSIZE;
85486af0 5003
203651b6
CB		 5004 if (args->netnsid >= 0 &&
5005 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
6ecf4c37
CB		 5006 return -EMSGSIZE;
5007
0ab6803b 5008 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 5009 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 5010 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 5011 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5012 nlmsg_cancel(skb, nlh);
5013 return -EMSGSIZE;
5014 }
85486af0 5015
053c095a
JB		 5016 nlmsg_end(skb, nlh);
5017 return 0;
1da177e4
LT		 5018}
5019
5020static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
203651b6 5021 struct inet6_fill_args *args)
1da177e4 5022{
9ee8cbb2
DA		 5023 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5024 int ifindex = dev ? dev->ifindex : 1;
1da177e4 5025 struct nlmsghdr *nlh;
101bb229 5026 u8 scope = RT_SCOPE_UNIVERSE;
101bb229
TG		 5027
5028 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5029 scope = RT_SCOPE_SITE;
1da177e4 5030
203651b6
CB		 5031 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5032 sizeof(struct ifaddrmsg), args->flags);
63159f29 5033 if (!nlh)
26932566 5034 return -EMSGSIZE;
85486af0 5035
203651b6
CB		 5036 if (args->netnsid >= 0 &&
5037 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
6ecf4c37
CB		 5038 return -EMSGSIZE;
5039
0ab6803b 5040 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 5041 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 5042 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 5043 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5044 nlmsg_cancel(skb, nlh);
5045 return -EMSGSIZE;
5046 }
1da177e4 5047
053c095a
JB		 5048 nlmsg_end(skb, nlh);
5049 return 0;
1da177e4
LT		 5050}
5051
234b27c3
ED		 5052/* called with rcu_read_lock() */
5053static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
fe884c2b 5054 struct netlink_callback *cb, int s_ip_idx,
6ba1e6e8 5055 struct inet6_fill_args *fillargs)
234b27c3 5056{
234b27c3
ED		 5057 struct ifmcaddr6 *ifmca;
5058 struct ifacaddr6 *ifaca;
fe884c2b 5059 int ip_idx = 0;
234b27c3 5060 int err = 1;
234b27c3
ED		 5061
5062 read_lock_bh(&idev->lock);
6ba1e6e8 5063 switch (fillargs->type) {
502a2ffd 5064 case UNICAST_ADDR: {
5065 struct inet6_ifaddr *ifa;
6ba1e6e8 5066 fillargs->event = RTM_NEWADDR;
502a2ffd 5067
234b27c3 5068 /* unicast address incl. temp addr */
502a2ffd 5069 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4ba4c566
DA		 5070 if (ip_idx < s_ip_idx)
5071 goto next;
6ba1e6e8 5072 err = inet6_fill_ifaddr(skb, ifa, fillargs);
053c095a 5073 if (err < 0)
234b27c3 5074 break;
63998ac2 5075 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4ba4c566
DA		 5076next:
5077 ip_idx++;
234b27c3
ED		 5078 }
5079 break;
502a2ffd 5080 }
234b27c3 5081 case MULTICAST_ADDR:
6ba1e6e8 5082 fillargs->event = RTM_GETMULTICAST;
203651b6 5083
234b27c3
ED		 5084 /* multicast address */
5085 for (ifmca = idev->mc_list; ifmca;
5086 ifmca = ifmca->next, ip_idx++) {
5087 if (ip_idx < s_ip_idx)
5088 continue;
6ba1e6e8 5089 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
053c095a 5090 if (err < 0)
234b27c3
ED		 5091 break;
5092 }
5093 break;
5094 case ANYCAST_ADDR:
6ba1e6e8 5095 fillargs->event = RTM_GETANYCAST;
234b27c3
ED		 5096 /* anycast address */
5097 for (ifaca = idev->ac_list; ifaca;
5098 ifaca = ifaca->aca_next, ip_idx++) {
5099 if (ip_idx < s_ip_idx)
5100 continue;
6ba1e6e8 5101 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
053c095a 5102 if (err < 0)
234b27c3
ED		 5103 break;
5104 }
5105 break;
5106 default:
5107 break;
5108 }
5109 read_unlock_bh(&idev->lock);
fe884c2b 5110 cb->args[2] = ip_idx;
234b27c3
ED		 5111 return err;
5112}
5113
ed6eff11
DA		 5114static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5115 struct inet6_fill_args *fillargs,
5116 struct net **tgt_net, struct sock *sk,
6371a71f 5117 struct netlink_callback *cb)
ed6eff11 5118{
6371a71f 5119 struct netlink_ext_ack *extack = cb->extack;
ed6eff11
DA		 5120 struct nlattr *tb[IFA_MAX+1];
5121 struct ifaddrmsg *ifm;
5122 int err, i;
5123
5124 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5125 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5126 return -EINVAL;
5127 }
5128
5129 ifm = nlmsg_data(nlh);
5130 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5131 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5132 return -EINVAL;
5133 }
6371a71f
DA		 5134
5135 fillargs->ifindex = ifm->ifa_index;
5136 if (fillargs->ifindex) {
5137 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5138 fillargs->flags |= NLM_F_DUMP_FILTERED;
ed6eff11
DA		 5139 }
5140
8cb08174
JB		 5141 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5142 ifa_ipv6_policy, extack);
ed6eff11
DA		 5143 if (err < 0)
5144 return err;
5145
5146 for (i = 0; i <= IFA_MAX; ++i) {
5147 if (!tb[i])
5148 continue;
5149
5150 if (i == IFA_TARGET_NETNSID) {
5151 struct net *net;
5152
5153 fillargs->netnsid = nla_get_s32(tb[i]);
5154 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5155 if (IS_ERR(net)) {
bf4cc40e 5156 fillargs->netnsid = -1;
ed6eff11
DA		 5157 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5158 return PTR_ERR(net);
5159 }
5160 *tgt_net = net;
5161 } else {
5162 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5163 return -EINVAL;
5164 }
5165 }
5166
5167 return 0;
5168}
5169
1da177e4
LT		 5170static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5171 enum addr_type_t type)
5172{
ed6eff11 5173 const struct nlmsghdr *nlh = cb->nlh;
6ba1e6e8
DA		 5174 struct inet6_fill_args fillargs = {
5175 .portid = NETLINK_CB(cb->skb).portid,
5176 .seq = cb->nlh->nlmsg_seq,
5177 .flags = NLM_F_MULTI,
5178 .netnsid = -1,
5179 .type = type,
5180 };
234b27c3 5181 struct net *net = sock_net(skb->sk);
6ecf4c37 5182 struct net *tgt_net = net;
fe884c2b 5183 int idx, s_idx, s_ip_idx;
234b27c3 5184 int h, s_h;
1da177e4 5185 struct net_device *dev;
234b27c3
ED		 5186 struct inet6_dev *idev;
5187 struct hlist_head *head;
242afaa6 5188 int err = 0;
1ab1457c 5189
234b27c3
ED		 5190 s_h = cb->args[0];
5191 s_idx = idx = cb->args[1];
fe884c2b 5192 s_ip_idx = cb->args[2];
5d5619b4 5193
ed6eff11 5194 if (cb->strict_check) {
ed6eff11 5195 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
6371a71f 5196 skb->sk, cb);
ed6eff11 5197 if (err < 0)
242afaa6 5198 goto put_tgt_net;
6371a71f 5199
242afaa6 5200 err = 0;
6371a71f
DA		 5201 if (fillargs.ifindex) {
5202 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
242afaa6
DA		 5203 if (!dev) {
5204 err = -ENODEV;
5205 goto put_tgt_net;
5206 }
6371a71f
DA		 5207 idev = __in6_dev_get(dev);
5208 if (idev) {
5209 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5210 &fillargs);
1518039f
JK		 5211 if (err > 0)
5212 err = 0;
6371a71f
DA		 5213 }
5214 goto put_tgt_net;
5215 }
6ecf4c37
CB		 5216 }
5217
234b27c3 5218 rcu_read_lock();
6ecf4c37 5219 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
234b27c3
ED		 5220 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5221 idx = 0;
6ecf4c37 5222 head = &tgt_net->dev_index_head[h];
b67bfe0d 5223 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 5224 if (idx < s_idx)
5225 goto cont;
4b97efdf 5226 if (h > s_h || idx > s_idx)
234b27c3 5227 s_ip_idx = 0;
e21e8467
SH		 5228 idev = __in6_dev_get(dev);
5229 if (!idev)
234b27c3
ED		 5230 goto cont;
5231
fe884c2b 5232 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
6ba1e6e8 5233 &fillargs) < 0)
234b27c3 5234 goto done;
7562f876 5235cont:
234b27c3
ED		 5236 idx++;
5237 }
1da177e4 5238 }
234b27c3
ED		 5239done:
5240 rcu_read_unlock();
5241 cb->args[0] = h;
5242 cb->args[1] = idx;
6371a71f 5243put_tgt_net:
6ba1e6e8 5244 if (fillargs.netnsid >= 0)
6ecf4c37 5245 put_net(tgt_net);
234b27c3 5246
7c1e8a38 5247 return skb->len ? : err;
1da177e4
LT		 5248}
5249
5250static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5251{
5252 enum addr_type_t type = UNICAST_ADDR;
b854272b 5253
1da177e4
LT		 5254 return inet6_dump_addr(skb, cb, type);
5255}
5256
5257static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5258{
5259 enum addr_type_t type = MULTICAST_ADDR;
b854272b 5260
1da177e4
LT		 5261 return inet6_dump_addr(skb, cb, type);
5262}
5263
5264
5265static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5266{
5267 enum addr_type_t type = ANYCAST_ADDR;
b854272b 5268
1da177e4
LT		 5269 return inet6_dump_addr(skb, cb, type);
5270}
5271
4b1373de
JK		 5272static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5273 const struct nlmsghdr *nlh,
5274 struct nlattr **tb,
5275 struct netlink_ext_ack *extack)
5276{
5277 struct ifaddrmsg *ifm;
5278 int i, err;
5279
5280 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5281 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5282 return -EINVAL;
5283 }
5284
2beb6d29
HL		 5285 if (!netlink_strict_get_check(skb))
5286 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5287 ifa_ipv6_policy, extack);
5288
4b1373de
JK		 5289 ifm = nlmsg_data(nlh);
5290 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5291 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5292 return -EINVAL;
5293 }
5294
8cb08174
JB		 5295 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5296 ifa_ipv6_policy, extack);
4b1373de
JK		 5297 if (err)
5298 return err;
5299
5300 for (i = 0; i <= IFA_MAX; i++) {
5301 if (!tb[i])
5302 continue;
5303
5304 switch (i) {
5305 case IFA_TARGET_NETNSID:
5306 case IFA_ADDRESS:
5307 case IFA_LOCAL:
5308 break;
5309 default:
5310 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5311 return -EINVAL;
5312 }
5313 }
5314
5315 return 0;
5316}
5317
c21ef3e3
DA		 5318static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5319 struct netlink_ext_ack *extack)
6c223828 5320{
3b1e0a65 5321 struct net *net = sock_net(in_skb->sk);
203651b6
CB		 5322 struct inet6_fill_args fillargs = {
5323 .portid = NETLINK_CB(in_skb).portid,
5324 .seq = nlh->nlmsg_seq,
5325 .event = RTM_NEWADDR,
5326 .flags = 0,
5327 .netnsid = -1,
5328 };
6ecf4c37 5329 struct net *tgt_net = net;
1b29fc2c
TG		 5330 struct ifaddrmsg *ifm;
5331 struct nlattr *tb[IFA_MAX+1];
caeaba79 5332 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 5333 struct net_device *dev = NULL;
5334 struct inet6_ifaddr *ifa;
5335 struct sk_buff *skb;
6c223828
NT		 5336 int err;
5337
4b1373de 5338 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
1b29fc2c 5339 if (err < 0)
c24675f8 5340 return err;
1b29fc2c 5341
6ecf4c37 5342 if (tb[IFA_TARGET_NETNSID]) {
203651b6 5343 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
6ecf4c37
CB		 5344
5345 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
203651b6 5346 fillargs.netnsid);
6ecf4c37
CB		 5347 if (IS_ERR(tgt_net))
5348 return PTR_ERR(tgt_net);
5349 }
5350
caeaba79 5351 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
c24675f8
FW		 5352 if (!addr)
5353 return -EINVAL;
6c223828 5354
1b29fc2c 5355 ifm = nlmsg_data(nlh);
6c223828 5356 if (ifm->ifa_index)
6ecf4c37 5357 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
6c223828 5358
6ecf4c37 5359 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
e21e8467 5360 if (!ifa) {
1b29fc2c
TG		 5361 err = -EADDRNOTAVAIL;
5362 goto errout;
5363 }
6c223828 5364
e21e8467
SH		 5365 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5366 if (!skb) {
6c223828 5367 err = -ENOBUFS;
1b29fc2c 5368 goto errout_ifa;
6c223828
NT		 5369 }
5370
203651b6 5371 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
26932566
PM		 5372 if (err < 0) {
5373 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5374 WARN_ON(err == -EMSGSIZE);
5375 kfree_skb(skb);
5376 goto errout_ifa;
5377 }
6ecf4c37 5378 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
1b29fc2c 5379errout_ifa:
6c223828 5380 in6_ifa_put(ifa);
1b29fc2c 5381errout:
c24675f8
FW		 5382 if (dev)
5383 dev_put(dev);
203651b6 5384 if (fillargs.netnsid >= 0)
6ecf4c37
CB		 5385 put_net(tgt_net);
5386
6c223828 5387 return err;
6c223828
NT		 5388}
5389
1da177e4
LT		 5390static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5391{
5392 struct sk_buff *skb;
c346dca1 5393 struct net *net = dev_net(ifa->idev->dev);
203651b6
CB		 5394 struct inet6_fill_args fillargs = {
5395 .portid = 0,
5396 .seq = 0,
5397 .event = event,
5398 .flags = 0,
5399 .netnsid = -1,
5400 };
5d620266 5401 int err = -ENOBUFS;
1da177e4 5402
0ab6803b 5403 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 5404 if (!skb)
5d620266
TG		 5405 goto errout;
5406
203651b6 5407 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
26932566
PM		 5408 if (err < 0) {
5409 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5410 WARN_ON(err == -EMSGSIZE);
5411 kfree_skb(skb);
5412 goto errout;
5413 }
1ce85fe4
PNA		 5414 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5415 return;
5d620266
TG		 5416errout:
5417 if (err < 0)
6fda7350 5418 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 5419}
5420
b6f99a21 5421static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 5422 __s32 *array, int bytes)
5423{
04561c1f
TG		 5424 BUG_ON(bytes < (DEVCONF_MAX * 4));
5425
1da177e4
LT		 5426 memset(array, 0, bytes);
5427 array[DEVCONF_FORWARDING] = cnf->forwarding;
5428 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5429 array[DEVCONF_MTU6] = cnf->mtu6;
5430 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5431 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5432 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5433 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5434 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 5435 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5436 jiffies_to_msecs(cnf->rtr_solicit_interval);
bd11f074
MŻ		 5437 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5438 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
93908d19
TG		 5439 array[DEVCONF_RTR_SOLICIT_DELAY] =
5440 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 5441 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 5442 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5443 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5444 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5445 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 5446 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5447 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5448 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5449 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5450 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 5451 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 5452 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 5453 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 5454 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 5455#ifdef CONFIG_IPV6_ROUTER_PREF
5456 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 5457 array[DEVCONF_RTR_PROBE_INTERVAL] =
5458 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 5459#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 5460 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
09c884d4
YH		 5461 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5462#endif
930d6ff2 5463#endif
fbea49e1 5464 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 5465 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 5466#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5467 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 5468 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 5469#endif
7bc570c8
YH		 5470#ifdef CONFIG_IPV6_MROUTE
5471 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5472#endif
778d80be 5473 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 5474 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 5475 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 5476 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 5477 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 5478 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 5479 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 5480 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 5481 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 5482 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 5483 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 5484 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 5485 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1ababeba 5486 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
bf355b8d
DL		 5487#ifdef CONFIG_IPV6_SEG6_HMAC
5488 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5489#endif
adc176c5 5490 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
d35a00b8 5491 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
df789fe7 5492 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
2210d6b2 5493 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
8610c7c6 5494 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled;
1da177e4
LT		 5495}
5496
b382b191
TG		 5497static inline size_t inet6_ifla6_size(void)
5498{
5499 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5500 + nla_total_size(sizeof(struct ifla_cacheinfo))
5501 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5502 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4 5503 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
bdd72f41
SD		 5504 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5505 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5506 + 0;
b382b191
TG		 5507}
5508
339bf98f
TG		 5509static inline size_t inet6_if_nlmsg_size(void)
5510{
5511 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5512 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5513 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5514 + nla_total_size(4) /* IFLA_MTU */
5515 + nla_total_size(4) /* IFLA_LINK */
0344338b 5516 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 5517 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 5518}
c5396a31 5519
be281e55 5520static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
aca05671 5521 int bytes)
7f7d9a6b
HX		 5522{
5523 int i;
aca05671 5524 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
7f7d9a6b
HX		 5525 BUG_ON(pad < 0);
5526
5527 /* Use put_unaligned() because stats may not be aligned for u64. */
aca05671
JH		 5528 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5529 for (i = 1; i < ICMP6_MIB_MAX; i++)
be281e55 5530 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b 5531
aca05671 5532 memset(&stats[ICMP6_MIB_MAX], 0, pad);
7f7d9a6b
HX		 5533}
5534
698365fa 5535static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 5536 int bytes, size_t syncpoff)
4ce3c183 5537{
a3a77372
R		 5538 int i, c;
5539 u64 buff[IPSTATS_MIB_MAX];
5540 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5541
4ce3c183
ED		 5542 BUG_ON(pad < 0);
5543
a3a77372
R		 5544 memset(buff, 0, sizeof(buff));
5545 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 5546
a3a77372
R		 5547 for_each_possible_cpu(c) {
5548 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5549 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5550 }
5551
5552 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5553 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 5554}
5555
7f7d9a6b
HX		 5556static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5557 int bytes)
5558{
e21e8467 5559 switch (attrtype) {
7f7d9a6b 5560 case IFLA_INET6_STATS:
a3a77372
R		 5561 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5562 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 5563 break;
5564 case IFLA_INET6_ICMP6STATS:
aca05671 5565 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
7f7d9a6b
HX		 5566 break;
5567 }
5568}
5569
d5566fd7
SV		 5570static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5571 u32 ext_filter_mask)
b382b191
TG		 5572{
5573 struct nlattr *nla;
5574 struct ifla_cacheinfo ci;
5575
c78679e8
DM		 5576 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5577 goto nla_put_failure;
b382b191 5578 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 5579 ci.tstamp = cstamp_delta(idev->tstamp);
5580 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 5581 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 5582 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5583 goto nla_put_failure;
b382b191 5584 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 5585 if (!nla)
b382b191
TG		 5586 goto nla_put_failure;
5587 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5588
5589 /* XXX - MC not implemented */
5590
d5566fd7
SV		 5591 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5592 return 0;
5593
b382b191 5594 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 5595 if (!nla)
b382b191
TG		 5596 goto nla_put_failure;
5597 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5598
5599 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 5600 if (!nla)
b382b191
TG		 5601 goto nla_put_failure;
5602 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5603
f53adae4 5604 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 5605 if (!nla)
f53adae4
DB		 5606 goto nla_put_failure;
5607 read_lock_bh(&idev->lock);
5608 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5609 read_unlock_bh(&idev->lock);
5610
0d7982ce
ND		 5611 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5612 goto nla_put_failure;
5613
b382b191
TG		 5614 return 0;
5615
5616nla_put_failure:
5617 return -EMSGSIZE;
5618}
5619
b1974ed0
AR		 5620static size_t inet6_get_link_af_size(const struct net_device *dev,
5621 u32 ext_filter_mask)
b382b191
TG		 5622{
5623 if (!__in6_dev_get(dev))
5624 return 0;
5625
5626 return inet6_ifla6_size();
5627}
5628
d5566fd7
SV		 5629static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5630 u32 ext_filter_mask)
b382b191
TG		 5631{
5632 struct inet6_dev *idev = __in6_dev_get(dev);
5633
5634 if (!idev)
5635 return -ENODATA;
5636
d5566fd7 5637 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5638 return -EMSGSIZE;
5639
5640 return 0;
5641}
5642
f53adae4
DB		 5643static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5644{
f53adae4
DB		 5645 struct inet6_ifaddr *ifp;
5646 struct net_device *dev = idev->dev;
47e27d5e 5647 bool clear_token, update_rs = false;
dc848292 5648 struct in6_addr ll_addr;
f53adae4 5649
c15b1cca
HFS		 5650 ASSERT_RTNL();
5651
63159f29 5652 if (!token)
f53adae4 5653 return -EINVAL;
f53adae4
DB		 5654 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5655 return -EINVAL;
f53adae4
DB		 5656 if (!ipv6_accept_ra(idev))
5657 return -EINVAL;
bd11f074 5658 if (idev->cnf.rtr_solicits == 0)
f53adae4
DB		 5659 return -EINVAL;
5660
5661 write_lock_bh(&idev->lock);
5662
5663 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5664 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5665
5666 write_unlock_bh(&idev->lock);
5667
47e27d5e
DB		 5668 clear_token = ipv6_addr_any(token);
5669 if (clear_token)
5670 goto update_lft;
5671
dc848292
HFS		 5672 if (!idev->dead && (idev->if_flags & IF_READY) &&
5673 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5674 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5675 /* If we're not ready, then normal ifup will take care
5676 * of this. Otherwise, we need to request our rs here.
5677 */
5678 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5679 update_rs = true;
5680 }
f53adae4 5681
47e27d5e 5682update_lft:
f53adae4 5683 write_lock_bh(&idev->lock);
fc403832 5684
77ecaace 5685 if (update_rs) {
fc403832 5686 idev->if_flags |= IF_RS_SENT;
bd11f074
MŻ		 5687 idev->rs_interval = rfc3315_s14_backoff_init(
5688 idev->cnf.rtr_solicit_interval);
77ecaace 5689 idev->rs_probes = 1;
bd11f074 5690 addrconf_mod_rs_timer(idev, idev->rs_interval);
77ecaace 5691 }
f53adae4
DB		 5692
5693 /* Well, that's kinda nasty ... */
5694 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5695 spin_lock(&ifp->lock);
617fe29d 5696 if (ifp->tokenized) {
f53adae4
DB		 5697 ifp->valid_lft = 0;
5698 ifp->prefered_lft = 0;
5699 }
5700 spin_unlock(&ifp->lock);
5701 }
5702
5703 write_unlock_bh(&idev->lock);
b2ed64a9 5704 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 5705 addrconf_verify_rtnl();
f53adae4
DB		 5706 return 0;
5707}
5708
11b1f828
DB		 5709static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5710 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5711 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5712};
5713
d35a00b8
FJ		 5714static int check_addr_gen_mode(int mode)
5715{
5716 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5717 mode != IN6_ADDR_GEN_MODE_NONE &&
5718 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5719 mode != IN6_ADDR_GEN_MODE_RANDOM)
5720 return -EINVAL;
5721 return 1;
5722}
5723
5724static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5725 int mode)
5726{
5727 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5728 !idev->cnf.stable_secret.initialized &&
5729 !net->ipv6.devconf_dflt->stable_secret.initialized)
5730 return -EINVAL;
5731 return 1;
5732}
5733
7dc2bcca
MM		 5734static int inet6_validate_link_af(const struct net_device *dev,
5735 const struct nlattr *nla)
5736{
5737 struct nlattr *tb[IFLA_INET6_MAX + 1];
5738 struct inet6_dev *idev = NULL;
5739 int err;
5740
5741 if (dev) {
5742 idev = __in6_dev_get(dev);
5743 if (!idev)
5744 return -EAFNOSUPPORT;
5745 }
5746
5747 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5748 inet6_af_policy, NULL);
5749 if (err)
5750 return err;
5751
5752 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5753 return -EINVAL;
5754
5755 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5756 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5757
5758 if (check_addr_gen_mode(mode) < 0)
5759 return -EINVAL;
5760 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5761 return -EINVAL;
5762 }
5763
5764 return 0;
5765}
5766
f53adae4
DB		 5767static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5768{
f53adae4
DB		 5769 struct inet6_dev *idev = __in6_dev_get(dev);
5770 struct nlattr *tb[IFLA_INET6_MAX + 1];
7dc2bcca 5771 int err;
f53adae4 5772
db3fa271
ED		 5773 if (!idev)
5774 return -EAFNOSUPPORT;
5775
8cb08174 5776 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
f53adae4
DB		 5777 BUG();
5778
bc91b0f0 5779 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 5780 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 5781 if (err)
5782 return err;
5783 }
5784
5785 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5786 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5787
d35a00b8 5788 idev->cnf.addr_gen_mode = mode;
bc91b0f0 5789 }
f53adae4 5790
7dc2bcca 5791 return 0;
f53adae4
DB		 5792}
5793
1ab1457c 5794static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5795 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5796{
04561c1f 5797 struct net_device *dev = idev->dev;
04561c1f
TG		 5798 struct ifinfomsg *hdr;
5799 struct nlmsghdr *nlh;
5800 void *protoinfo;
04561c1f 5801
15e47304 5802 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5803 if (!nlh)
26932566 5804 return -EMSGSIZE;
04561c1f
TG		 5805
5806 hdr = nlmsg_data(nlh);
5807 hdr->ifi_family = AF_INET6;
5808 hdr->__ifi_pad = 0;
5809 hdr->ifi_type = dev->type;
5810 hdr->ifi_index = dev->ifindex;
5811 hdr->ifi_flags = dev_get_flags(dev);
5812 hdr->ifi_change = 0;
5813
c78679e8
DM		 5814 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5815 (dev->addr_len &&
5816 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5817 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5818 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5819 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5820 nla_put_u8(skb, IFLA_OPERSTATE,
5821 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5822 goto nla_put_failure;
ae0be8de 5823 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
63159f29 5824 if (!protoinfo)
04561c1f 5825 goto nla_put_failure;
1da177e4 5826
d5566fd7 5827 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5828 goto nla_put_failure;
1da177e4 5829
04561c1f 5830 nla_nest_end(skb, protoinfo);
053c095a
JB		 5831 nlmsg_end(skb, nlh);
5832 return 0;
1da177e4 5833
04561c1f 5834nla_put_failure:
26932566
PM		 5835 nlmsg_cancel(skb, nlh);
5836 return -EMSGSIZE;
1da177e4
LT		 5837}
5838
786e0007
DA		 5839static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5840 struct netlink_ext_ack *extack)
5841{
5842 struct ifinfomsg *ifm;
5843
5844 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5845 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5846 return -EINVAL;
5847 }
5848
5849 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5850 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5851 return -EINVAL;
5852 }
5853
5854 ifm = nlmsg_data(nlh);
5855 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5856 ifm->ifi_change || ifm->ifi_index) {
5857 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5858 return -EINVAL;
5859 }
5860
5861 return 0;
5862}
5863
1da177e4
LT		 5864static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5865{
3b1e0a65 5866 struct net *net = sock_net(skb->sk);
84d2697d 5867 int h, s_h;
434a8a58 5868 int idx = 0, s_idx;
1da177e4
LT		 5869 struct net_device *dev;
5870 struct inet6_dev *idev;
84d2697d 5871 struct hlist_head *head;
1da177e4 5872
786e0007
DA		 5873 /* only requests using strict checking can pass data to
5874 * influence the dump
5875 */
5876 if (cb->strict_check) {
5877 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
5878
5879 if (err < 0)
5880 return err;
5881 }
5882
84d2697d
ED		 5883 s_h = cb->args[0];
5884 s_idx = cb->args[1];
5885
5886 rcu_read_lock();
5887 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5888 idx = 0;
5889 head = &net->dev_index_head[h];
b67bfe0d 5890 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5891 if (idx < s_idx)
5892 goto cont;
5893 idev = __in6_dev_get(dev);
5894 if (!idev)
5895 goto cont;
5896 if (inet6_fill_ifinfo(skb, idev,
15e47304 5897 NETLINK_CB(cb->skb).portid,
84d2697d 5898 cb->nlh->nlmsg_seq,
053c095a 5899 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5900 goto out;
7562f876 5901cont:
84d2697d
ED		 5902 idx++;
5903 }
1da177e4 5904 }
84d2697d
ED		 5905out:
5906 rcu_read_unlock();
5907 cb->args[1] = idx;
5908 cb->args[0] = h;
1da177e4
LT		 5909
5910 return skb->len;
5911}
5912
5913void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5914{
5915 struct sk_buff *skb;
c346dca1 5916 struct net *net = dev_net(idev->dev);
8d7a76c9 5917 int err = -ENOBUFS;
1ab1457c 5918
339bf98f 5919 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5920 if (!skb)
8d7a76c9
TG		 5921 goto errout;
5922
5923 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5924 if (err < 0) {
5925 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5926 WARN_ON(err == -EMSGSIZE);
5927 kfree_skb(skb);
5928 goto errout;
5929 }
5f75a104 5930 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5931 return;
8d7a76c9
TG		 5932errout:
5933 if (err < 0)
5f75a104 5934 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5935}
5936
339bf98f
TG		 5937static inline size_t inet6_prefix_nlmsg_size(void)
5938{
5939 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5940 + nla_total_size(sizeof(struct in6_addr))
5941 + nla_total_size(sizeof(struct prefix_cacheinfo));
5942}
c5396a31 5943
1da177e4 5944static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5945 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5946 int event, unsigned int flags)
1da177e4 5947{
6051e2f4
TG		 5948 struct prefixmsg *pmsg;
5949 struct nlmsghdr *nlh;
1da177e4
LT		 5950 struct prefix_cacheinfo ci;
5951
15e47304 5952 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5953 if (!nlh)
26932566 5954 return -EMSGSIZE;
6051e2f4
TG		 5955
5956 pmsg = nlmsg_data(nlh);
1da177e4 5957 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5958 pmsg->prefix_pad1 = 0;
5959 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5960 pmsg->prefix_ifindex = idev->dev->ifindex;
5961 pmsg->prefix_len = pinfo->prefix_len;
5962 pmsg->prefix_type = pinfo->type;
8a47077a 5963 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5964 pmsg->prefix_flags = 0;
5965 if (pinfo->onlink)
5966 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5967 if (pinfo->autoconf)
5968 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5969
c78679e8
DM		 5970 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5971 goto nla_put_failure;
1da177e4
LT		 5972 ci.preferred_time = ntohl(pinfo->prefered);
5973 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5974 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5975 goto nla_put_failure;
053c095a
JB		 5976 nlmsg_end(skb, nlh);
5977 return 0;
1da177e4 5978
6051e2f4 5979nla_put_failure:
26932566
PM		 5980 nlmsg_cancel(skb, nlh);
5981 return -EMSGSIZE;
1da177e4
LT		 5982}
5983
1ab1457c 5984static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5985 struct prefix_info *pinfo)
5986{
5987 struct sk_buff *skb;
c346dca1 5988 struct net *net = dev_net(idev->dev);
8c384bfa 5989 int err = -ENOBUFS;
1da177e4 5990
339bf98f 5991 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5992 if (!skb)
8c384bfa
TG		 5993 goto errout;
5994
5995 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5996 if (err < 0) {
5997 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5998 WARN_ON(err == -EMSGSIZE);
5999 kfree_skb(skb);
6000 goto errout;
6001 }
1ce85fe4
PNA		 6002 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6003 return;
8c384bfa
TG		 6004errout:
6005 if (err < 0)
6fda7350 6006 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 6007}
6008
1da177e4
LT		 6009static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6010{
63998ac2
ND		 6011 struct net *net = dev_net(ifp->idev->dev);
6012
c15b1cca
HFS		 6013 if (event)
6014 ASSERT_RTNL();
6015
1da177e4
LT		 6016 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6017
6018 switch (event) {
6019 case RTM_NEWADDR:
95c385b4 6020 /*
2d819d25
DA		 6021 * If the address was optimistic we inserted the route at the
6022 * start of our DAD process, so we don't need to do it again.
6023 * If the device was taken down in the middle of the DAD
6024 * cycle there is a race where we could get here without a
6025 * host route, so nothing to insert. That will be fixed when
6026 * the device is brought up.
95c385b4 6027 */
2d819d25 6028 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
afb1d4b5 6029 ip6_ins_rt(net, ifp->rt);
2d819d25
DA		 6030 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6031 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6032 &ifp->addr, ifp->idev->dev->name);
6033 }
6034
1da177e4
LT		 6035 if (ifp->idev->cnf.forwarding)
6036 addrconf_join_anycast(ifp);
7996c799 6037 if (!ipv6_addr_any(&ifp->peer_addr))
07758eb9
HL		 6038 addrconf_prefix_route(&ifp->peer_addr, 128,
6039 ifp->rt_priority, ifp->idev->dev,
6040 0, 0, GFP_ATOMIC);
1da177e4
LT		 6041 break;
6042 case RTM_DELADDR:
6043 if (ifp->idev->cnf.forwarding)
6044 addrconf_leave_anycast(ifp);
6045 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 6046 if (!ipv6_addr_any(&ifp->peer_addr)) {
8d1c802b 6047 struct fib6_info *rt;
caeaba79 6048
e7478dfc 6049 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
2b2450ca
DA		 6050 ifp->idev->dev, 0, 0,
6051 false);
8e3d5be7 6052 if (rt)
11dd74b3 6053 ip6_del_rt(net, rt, false);
caeaba79 6054 }
38bd10c4 6055 if (ifp->rt) {
11dd74b3 6056 ip6_del_rt(net, ifp->rt, false);
93531c67 6057 ifp->rt = NULL;
38bd10c4 6058 }
705f1c86 6059 rt_genid_bump_ipv6(net);
1da177e4
LT		 6060 break;
6061 }
63998ac2 6062 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 6063}
6064
6065static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6066{
8814c4b5 6067 rcu_read_lock_bh();
1da177e4
LT		 6068 if (likely(ifp->idev->dead == 0))
6069 __ipv6_ifa_notify(event, ifp);
8814c4b5 6070 rcu_read_unlock_bh();
1da177e4
LT		 6071}
6072
6073#ifdef CONFIG_SYSCTL
6074
32927393
CH		 6075static int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6076 void *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 6077{
6078 int *valp = ctl->data;
6079 int val = *valp;
88af182e 6080 loff_t pos = *ppos;
fe2c6338 6081 struct ctl_table lctl;
1da177e4
LT		 6082 int ret;
6083
013d97e9
FR		 6084 /*
6085 * ctl->data points to idev->cnf.forwarding, we should
6086 * not modify it until we get the rtnl lock.
6087 */
6088 lctl = *ctl;
6089 lctl.data = &val;
6090
6091 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 6092
c8fecf22 6093 if (write)
b325fddb 6094 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 6095 if (ret)
6096 *ppos = pos;
1ab1457c 6097 return ret;
1da177e4
LT		 6098}
6099
32927393
CH		 6100static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6101 void *buffer, size_t *lenp, loff_t *ppos)
77751427
ML		 6102{
6103 struct inet6_dev *idev = ctl->extra1;
6104 int min_mtu = IPV6_MIN_MTU;
6105 struct ctl_table lctl;
6106
6107 lctl = *ctl;
6108 lctl.extra1 = &min_mtu;
6109 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6110
6111 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6112}
6113
56d417b1
BH		 6114static void dev_disable_change(struct inet6_dev *idev)
6115{
75538c2b
CW		 6116 struct netdev_notifier_info info;
6117
56d417b1
BH		 6118 if (!idev || !idev->dev)
6119 return;
6120
75538c2b 6121 netdev_notifier_info_init(&info, idev->dev);
56d417b1 6122 if (idev->cnf.disable_ipv6)
75538c2b 6123 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 6124 else
75538c2b 6125 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 6126}
6127
6128static void addrconf_disable_change(struct net *net, __s32 newf)
6129{
6130 struct net_device *dev;
6131 struct inet6_dev *idev;
6132
03e4deff 6133 for_each_netdev(net, dev) {
56d417b1
BH		 6134 idev = __in6_dev_get(dev);
6135 if (idev) {
6136 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6137 idev->cnf.disable_ipv6 = newf;
6138 if (changed)
6139 dev_disable_change(idev);
6140 }
56d417b1 6141 }
56d417b1
BH		 6142}
6143
013d97e9 6144static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 6145{
6146 struct net *net;
013d97e9
FR		 6147 int old;
6148
6149 if (!rtnl_trylock())
6150 return restart_syscall();
56d417b1
BH		 6151
6152 net = (struct net *)table->extra2;
013d97e9
FR		 6153 old = *p;
6154 *p = newf;
56d417b1 6155
013d97e9
FR		 6156 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6157 rtnl_unlock();
56d417b1 6158 return 0;
88af182e 6159 }
56d417b1
BH		 6160
6161 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 6162 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6163 addrconf_disable_change(net, newf);
013d97e9 6164 } else if ((!newf) ^ (!old))
56d417b1
BH		 6165 dev_disable_change((struct inet6_dev *)table->extra1);
6166
6167 rtnl_unlock();
6168 return 0;
6169}
6170
32927393
CH		 6171static int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6172 void *buffer, size_t *lenp, loff_t *ppos)
56d417b1
BH		 6173{
6174 int *valp = ctl->data;
6175 int val = *valp;
88af182e 6176 loff_t pos = *ppos;
fe2c6338 6177 struct ctl_table lctl;
56d417b1
BH		 6178 int ret;
6179
013d97e9
FR		 6180 /*
6181 * ctl->data points to idev->cnf.disable_ipv6, we should
6182 * not modify it until we get the rtnl lock.
6183 */
6184 lctl = *ctl;
6185 lctl.data = &val;
6186
6187 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 6188
6189 if (write)
6190 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 6191 if (ret)
6192 *ppos = pos;
56d417b1
BH		 6193 return ret;
6194}
6195
32927393
CH		 6196static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6197 void *buffer, size_t *lenp, loff_t *ppos)
c92d5491 6198{
6199 int *valp = ctl->data;
6200 int ret;
6201 int old, new;
6202
6203 old = *valp;
6204 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6205 new = *valp;
6206
6207 if (write && old != new) {
6208 struct net *net = ctl->extra2;
6209
6210 if (!rtnl_trylock())
6211 return restart_syscall();
6212
6213 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
85b3daad
DA		 6214 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6215 NETCONFA_PROXY_NEIGH,
c92d5491 6216 NETCONFA_IFINDEX_DEFAULT,
6217 net->ipv6.devconf_dflt);
6218 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
85b3daad
DA		 6219 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6220 NETCONFA_PROXY_NEIGH,
c92d5491 6221 NETCONFA_IFINDEX_ALL,
6222 net->ipv6.devconf_all);
6223 else {
6224 struct inet6_dev *idev = ctl->extra1;
6225
85b3daad
DA		 6226 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6227 NETCONFA_PROXY_NEIGH,
c92d5491 6228 idev->dev->ifindex,
6229 &idev->cnf);
6230 }
6231 rtnl_unlock();
6232 }
6233
6234 return ret;
6235}
6236
d35a00b8 6237static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
32927393 6238 void *buffer, size_t *lenp,
d35a00b8
FJ		 6239 loff_t *ppos)
6240{
6241 int ret = 0;
c6dbf7aa 6242 u32 new_val;
d35a00b8
FJ		 6243 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6244 struct net *net = (struct net *)ctl->extra2;
c6dbf7aa
SD		 6245 struct ctl_table tmp = {
6246 .data = &new_val,
6247 .maxlen = sizeof(new_val),
6248 .mode = ctl->mode,
6249 };
d35a00b8 6250
8c171d6c
FJ		 6251 if (!rtnl_trylock())
6252 return restart_syscall();
6253
c6dbf7aa 6254 new_val = *((u32 *)ctl->data);
d35a00b8 6255
c6dbf7aa
SD		 6256 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6257 if (ret != 0)
6258 goto out;
d35a00b8 6259
c6dbf7aa 6260 if (write) {
8c171d6c
FJ		 6261 if (check_addr_gen_mode(new_val) < 0) {
6262 ret = -EINVAL;
6263 goto out;
6264 }
d35a00b8 6265
c6dbf7aa 6266 if (idev) {
8c171d6c
FJ		 6267 if (check_stable_privacy(idev, net, new_val) < 0) {
6268 ret = -EINVAL;
6269 goto out;
6270 }
d35a00b8
FJ		 6271
6272 if (idev->cnf.addr_gen_mode != new_val) {
6273 idev->cnf.addr_gen_mode = new_val;
d35a00b8 6274 addrconf_dev_config(idev->dev);
d35a00b8 6275 }
f24c5987
SD		 6276 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6277 struct net_device *dev;
6278
6279 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6280 for_each_netdev(net, dev) {
6281 idev = __in6_dev_get(dev);
6282 if (idev &&
6283 idev->cnf.addr_gen_mode != new_val) {
6284 idev->cnf.addr_gen_mode = new_val;
6285 addrconf_dev_config(idev->dev);
6286 }
6287 }
d35a00b8 6288 }
c6dbf7aa
SD		 6289
6290 *((u32 *)ctl->data) = new_val;
d35a00b8
FJ		 6291 }
6292
8c171d6c
FJ		 6293out:
6294 rtnl_unlock();
6295
d35a00b8
FJ		 6296 return ret;
6297}
6298
3d1bec99 6299static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
32927393 6300 void *buffer, size_t *lenp,
3d1bec99
HFS		 6301 loff_t *ppos)
6302{
6303 int err;
6304 struct in6_addr addr;
6305 char str[IPV6_MAX_STRLEN];
6306 struct ctl_table lctl = *ctl;
622c81d5 6307 struct net *net = ctl->extra2;
3d1bec99
HFS		 6308 struct ipv6_stable_secret *secret = ctl->data;
6309
622c81d5
HFS		 6310 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6311 return -EIO;
6312
3d1bec99
HFS		 6313 lctl.maxlen = IPV6_MAX_STRLEN;
6314 lctl.data = str;
6315
6316 if (!rtnl_trylock())
6317 return restart_syscall();
6318
6319 if (!write && !secret->initialized) {
6320 err = -EIO;
6321 goto out;
6322 }
6323
5449a5ca
WC		 6324 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6325 if (err >= sizeof(str)) {
6326 err = -EIO;
6327 goto out;
3d1bec99
HFS		 6328 }
6329
6330 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6331 if (err || !write)
6332 goto out;
6333
6334 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6335 err = -EIO;
6336 goto out;
6337 }
6338
6339 secret->initialized = true;
6340 secret->secret = addr;
6341
622c81d5
HFS		 6342 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6343 struct net_device *dev;
6344
6345 for_each_netdev(net, dev) {
6346 struct inet6_dev *idev = __in6_dev_get(dev);
6347
6348 if (idev) {
d35a00b8 6349 idev->cnf.addr_gen_mode =
622c81d5
HFS		 6350 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6351 }
6352 }
6353 } else {
6354 struct inet6_dev *idev = ctl->extra1;
6355
d35a00b8 6356 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
622c81d5
HFS		 6357 }
6358
3d1bec99
HFS		 6359out:
6360 rtnl_unlock();
6361
6362 return err;
6363}
c92d5491 6364
35103d11
AG		 6365static
6366int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
32927393 6367 int write, void *buffer,
35103d11
AG		 6368 size_t *lenp,
6369 loff_t *ppos)
6370{
6371 int *valp = ctl->data;
6372 int val = *valp;
6373 loff_t pos = *ppos;
6374 struct ctl_table lctl;
6375 int ret;
6376
6377 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6378 * we should not modify it until we get the rtnl lock.
6379 */
6380 lctl = *ctl;
6381 lctl.data = &val;
6382
6383 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6384
6385 if (write)
6386 ret = addrconf_fixup_linkdown(ctl, valp, val);
6387 if (ret)
6388 *ppos = pos;
6389 return ret;
6390}
6391
df789fe7
DF		 6392static
6393void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6394{
6395 if (rt) {
6396 if (action)
6397 rt->dst.flags |= DST_NOPOLICY;
6398 else
6399 rt->dst.flags &= ~DST_NOPOLICY;
6400 }
6401}
6402
6403static
6404void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6405{
6406 struct inet6_ifaddr *ifa;
6407
6408 read_lock_bh(&idev->lock);
6409 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6410 spin_lock(&ifa->lock);
6411 if (ifa->rt) {
f88d8ea6 6412 /* host routes only use builtin fib6_nh */
1cf844c7 6413 struct fib6_nh *nh = ifa->rt->fib6_nh;
df789fe7
DF		 6414 int cpu;
6415
66f5d6ce 6416 rcu_read_lock();
3b6761d1 6417 ifa->rt->dst_nopolicy = val ? true : false;
f40b6ae2 6418 if (nh->rt6i_pcpu) {
df789fe7
DF		 6419 for_each_possible_cpu(cpu) {
6420 struct rt6_info **rtp;
6421
f40b6ae2 6422 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
df789fe7
DF		 6423 addrconf_set_nopolicy(*rtp, val);
6424 }
6425 }
66f5d6ce 6426 rcu_read_unlock();
df789fe7
DF		 6427 }
6428 spin_unlock(&ifa->lock);
6429 }
6430 read_unlock_bh(&idev->lock);
6431}
6432
6433static
6434int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6435{
6436 struct inet6_dev *idev;
6437 struct net *net;
6438
6439 if (!rtnl_trylock())
6440 return restart_syscall();
6441
6442 *valp = val;
6443
6444 net = (struct net *)ctl->extra2;
6445 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6446 rtnl_unlock();
6447 return 0;
6448 }
6449
6450 if (valp == &net->ipv6.devconf_all->disable_policy) {
6451 struct net_device *dev;
6452
6453 for_each_netdev(net, dev) {
6454 idev = __in6_dev_get(dev);
6455 if (idev)
6456 addrconf_disable_policy_idev(idev, val);
6457 }
6458 } else {
6459 idev = (struct inet6_dev *)ctl->extra1;
6460 addrconf_disable_policy_idev(idev, val);
6461 }
6462
6463 rtnl_unlock();
6464 return 0;
6465}
6466
32927393
CH		 6467static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6468 void *buffer, size_t *lenp, loff_t *ppos)
df789fe7
DF		 6469{
6470 int *valp = ctl->data;
6471 int val = *valp;
6472 loff_t pos = *ppos;
6473 struct ctl_table lctl;
6474 int ret;
6475
6476 lctl = *ctl;
6477 lctl.data = &val;
6478 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6479
6480 if (write && (*valp != val))
6481 ret = addrconf_disable_policy(ctl, valp, val);
6482
6483 if (ret)
6484 *ppos = pos;
6485
6486 return ret;
6487}
6488
cb4a4c69 6489static int minus_one = -1;
cb9e684e
MŻ		 6490static const int two_five_five = 255;
6491
607ea7cd 6492static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 6493 {
6494 .procname = "forwarding",
6495 .data = &ipv6_devconf.forwarding,
6496 .maxlen = sizeof(int),
6497 .mode = 0644,
6498 .proc_handler = addrconf_sysctl_forward,
6499 },
6500 {
6501 .procname = "hop_limit",
6502 .data = &ipv6_devconf.hop_limit,
6503 .maxlen = sizeof(int),
6504 .mode = 0644,
cb9e684e 6505 .proc_handler = proc_dointvec_minmax,
eec4844f 6506 .extra1 = (void *)SYSCTL_ONE,
cb9e684e 6507 .extra2 = (void *)&two_five_five,
5df1f77f
KK		 6508 },
6509 {
6510 .procname = "mtu",
6511 .data = &ipv6_devconf.mtu6,
6512 .maxlen = sizeof(int),
6513 .mode = 0644,
6514 .proc_handler = addrconf_sysctl_mtu,
6515 },
6516 {
6517 .procname = "accept_ra",
6518 .data = &ipv6_devconf.accept_ra,
6519 .maxlen = sizeof(int),
6520 .mode = 0644,
6521 .proc_handler = proc_dointvec,
6522 },
6523 {
6524 .procname = "accept_redirects",
6525 .data = &ipv6_devconf.accept_redirects,
6526 .maxlen = sizeof(int),
6527 .mode = 0644,
6528 .proc_handler = proc_dointvec,
6529 },
6530 {
6531 .procname = "autoconf",
6532 .data = &ipv6_devconf.autoconf,
6533 .maxlen = sizeof(int),
6534 .mode = 0644,
6535 .proc_handler = proc_dointvec,
6536 },
6537 {
6538 .procname = "dad_transmits",
6539 .data = &ipv6_devconf.dad_transmits,
6540 .maxlen = sizeof(int),
6541 .mode = 0644,
6542 .proc_handler = proc_dointvec,
6543 },
6544 {
6545 .procname = "router_solicitations",
6546 .data = &ipv6_devconf.rtr_solicits,
6547 .maxlen = sizeof(int),
6548 .mode = 0644,
cb4a4c69
MŻ		 6549 .proc_handler = proc_dointvec_minmax,
6550 .extra1 = &minus_one,
5df1f77f
KK		 6551 },
6552 {
6553 .procname = "router_solicitation_interval",
6554 .data = &ipv6_devconf.rtr_solicit_interval,
6555 .maxlen = sizeof(int),
6556 .mode = 0644,
6557 .proc_handler = proc_dointvec_jiffies,
6558 },
bd11f074
MŻ		 6559 {
6560 .procname = "router_solicitation_max_interval",
6561 .data = &ipv6_devconf.rtr_solicit_max_interval,
6562 .maxlen = sizeof(int),
6563 .mode = 0644,
6564 .proc_handler = proc_dointvec_jiffies,
6565 },
5df1f77f
KK		 6566 {
6567 .procname = "router_solicitation_delay",
6568 .data = &ipv6_devconf.rtr_solicit_delay,
6569 .maxlen = sizeof(int),
6570 .mode = 0644,
6571 .proc_handler = proc_dointvec_jiffies,
6572 },
6573 {
6574 .procname = "force_mld_version",
6575 .data = &ipv6_devconf.force_mld_version,
6576 .maxlen = sizeof(int),
6577 .mode = 0644,
6578 .proc_handler = proc_dointvec,
6579 },
6580 {
6581 .procname = "mldv1_unsolicited_report_interval",
6582 .data =
6583 &ipv6_devconf.mldv1_unsolicited_report_interval,
6584 .maxlen = sizeof(int),
6585 .mode = 0644,
6586 .proc_handler = proc_dointvec_ms_jiffies,
6587 },
6588 {
6589 .procname = "mldv2_unsolicited_report_interval",
6590 .data =
6591 &ipv6_devconf.mldv2_unsolicited_report_interval,
6592 .maxlen = sizeof(int),
6593 .mode = 0644,
6594 .proc_handler = proc_dointvec_ms_jiffies,
6595 },
6596 {
6597 .procname = "use_tempaddr",
6598 .data = &ipv6_devconf.use_tempaddr,
6599 .maxlen = sizeof(int),
6600 .mode = 0644,
6601 .proc_handler = proc_dointvec,
6602 },
6603 {
6604 .procname = "temp_valid_lft",
6605 .data = &ipv6_devconf.temp_valid_lft,
6606 .maxlen = sizeof(int),
6607 .mode = 0644,
6608 .proc_handler = proc_dointvec,
6609 },
6610 {
6611 .procname = "temp_prefered_lft",
6612 .data = &ipv6_devconf.temp_prefered_lft,
6613 .maxlen = sizeof(int),
6614 .mode = 0644,
6615 .proc_handler = proc_dointvec,
6616 },
6617 {
6618 .procname = "regen_max_retry",
6619 .data = &ipv6_devconf.regen_max_retry,
6620 .maxlen = sizeof(int),
6621 .mode = 0644,
6622 .proc_handler = proc_dointvec,
6623 },
6624 {
6625 .procname = "max_desync_factor",
6626 .data = &ipv6_devconf.max_desync_factor,
6627 .maxlen = sizeof(int),
6628 .mode = 0644,
6629 .proc_handler = proc_dointvec,
6630 },
6631 {
6632 .procname = "max_addresses",
6633 .data = &ipv6_devconf.max_addresses,
6634 .maxlen = sizeof(int),
6635 .mode = 0644,
6636 .proc_handler = proc_dointvec,
6637 },
6638 {
6639 .procname = "accept_ra_defrtr",
6640 .data = &ipv6_devconf.accept_ra_defrtr,
6641 .maxlen = sizeof(int),
6642 .mode = 0644,
6643 .proc_handler = proc_dointvec,
6644 },
6645 {
6646 .procname = "accept_ra_min_hop_limit",
6647 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6648 .maxlen = sizeof(int),
6649 .mode = 0644,
6650 .proc_handler = proc_dointvec,
6651 },
6652 {
6653 .procname = "accept_ra_pinfo",
6654 .data = &ipv6_devconf.accept_ra_pinfo,
6655 .maxlen = sizeof(int),
6656 .mode = 0644,
6657 .proc_handler = proc_dointvec,
6658 },
930d6ff2 6659#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 6660 {
6661 .procname = "accept_ra_rtr_pref",
6662 .data = &ipv6_devconf.accept_ra_rtr_pref,
6663 .maxlen = sizeof(int),
6664 .mode = 0644,
6665 .proc_handler = proc_dointvec,
6666 },
6667 {
6668 .procname = "router_probe_interval",
6669 .data = &ipv6_devconf.rtr_probe_interval,
6670 .maxlen = sizeof(int),
6671 .mode = 0644,
6672 .proc_handler = proc_dointvec_jiffies,
6673 },
fa03ef38 6674#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b
JS		 6675 {
6676 .procname = "accept_ra_rt_info_min_plen",
6677 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6678 .maxlen = sizeof(int),
6679 .mode = 0644,
6680 .proc_handler = proc_dointvec,
6681 },
5df1f77f
KK		 6682 {
6683 .procname = "accept_ra_rt_info_max_plen",
6684 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6685 .maxlen = sizeof(int),
6686 .mode = 0644,
6687 .proc_handler = proc_dointvec,
6688 },
09c884d4 6689#endif
930d6ff2 6690#endif
5df1f77f
KK		 6691 {
6692 .procname = "proxy_ndp",
6693 .data = &ipv6_devconf.proxy_ndp,
6694 .maxlen = sizeof(int),
6695 .mode = 0644,
6696 .proc_handler = addrconf_sysctl_proxy_ndp,
6697 },
6698 {
6699 .procname = "accept_source_route",
6700 .data = &ipv6_devconf.accept_source_route,
6701 .maxlen = sizeof(int),
6702 .mode = 0644,
6703 .proc_handler = proc_dointvec,
6704 },
95c385b4 6705#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 6706 {
6707 .procname = "optimistic_dad",
6708 .data = &ipv6_devconf.optimistic_dad,
6709 .maxlen = sizeof(int),
6710 .mode = 0644,
6711 .proc_handler = proc_dointvec,
6712 },
6713 {
6714 .procname = "use_optimistic",
6715 .data = &ipv6_devconf.use_optimistic,
6716 .maxlen = sizeof(int),
6717 .mode = 0644,
6718 .proc_handler = proc_dointvec,
6719 },
7bc570c8
YH		 6720#endif
6721#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 6722 {
6723 .procname = "mc_forwarding",
6724 .data = &ipv6_devconf.mc_forwarding,
6725 .maxlen = sizeof(int),
6726 .mode = 0444,
6727 .proc_handler = proc_dointvec,
6728 },
95c385b4 6729#endif
5df1f77f
KK		 6730 {
6731 .procname = "disable_ipv6",
6732 .data = &ipv6_devconf.disable_ipv6,
6733 .maxlen = sizeof(int),
6734 .mode = 0644,
6735 .proc_handler = addrconf_sysctl_disable,
6736 },
6737 {
6738 .procname = "accept_dad",
6739 .data = &ipv6_devconf.accept_dad,
6740 .maxlen = sizeof(int),
6741 .mode = 0644,
6742 .proc_handler = proc_dointvec,
6743 },
6744 {
6745 .procname = "force_tllao",
6746 .data = &ipv6_devconf.force_tllao,
6747 .maxlen = sizeof(int),
6748 .mode = 0644,
6749 .proc_handler = proc_dointvec
6750 },
6751 {
6752 .procname = "ndisc_notify",
6753 .data = &ipv6_devconf.ndisc_notify,
6754 .maxlen = sizeof(int),
6755 .mode = 0644,
6756 .proc_handler = proc_dointvec
6757 },
6758 {
6759 .procname = "suppress_frag_ndisc",
6760 .data = &ipv6_devconf.suppress_frag_ndisc,
6761 .maxlen = sizeof(int),
6762 .mode = 0644,
6763 .proc_handler = proc_dointvec
6764 },
6765 {
6766 .procname = "accept_ra_from_local",
6767 .data = &ipv6_devconf.accept_ra_from_local,
6768 .maxlen = sizeof(int),
6769 .mode = 0644,
6770 .proc_handler = proc_dointvec,
6771 },
6772 {
6773 .procname = "accept_ra_mtu",
6774 .data = &ipv6_devconf.accept_ra_mtu,
6775 .maxlen = sizeof(int),
6776 .mode = 0644,
6777 .proc_handler = proc_dointvec,
6778 },
6779 {
6780 .procname = "stable_secret",
6781 .data = &ipv6_devconf.stable_secret,
6782 .maxlen = IPV6_MAX_STRLEN,
6783 .mode = 0600,
6784 .proc_handler = addrconf_sysctl_stable_secret,
6785 },
6786 {
6787 .procname = "use_oif_addrs_only",
6788 .data = &ipv6_devconf.use_oif_addrs_only,
6789 .maxlen = sizeof(int),
6790 .mode = 0644,
6791 .proc_handler = proc_dointvec,
6792 },
6793 {
6794 .procname = "ignore_routes_with_linkdown",
6795 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6796 .maxlen = sizeof(int),
6797 .mode = 0644,
6798 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6799 },
6800 {
6801 .procname = "drop_unicast_in_l2_multicast",
6802 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6803 .maxlen = sizeof(int),
6804 .mode = 0644,
6805 .proc_handler = proc_dointvec,
6806 },
6807 {
6808 .procname = "drop_unsolicited_na",
6809 .data = &ipv6_devconf.drop_unsolicited_na,
6810 .maxlen = sizeof(int),
6811 .mode = 0644,
6812 .proc_handler = proc_dointvec,
6813 },
6814 {
6815 .procname = "keep_addr_on_down",
6816 .data = &ipv6_devconf.keep_addr_on_down,
6817 .maxlen = sizeof(int),
6818 .mode = 0644,
6819 .proc_handler = proc_dointvec,
6820
6821 },
1ababeba
DL		 6822 {
6823 .procname = "seg6_enabled",
6824 .data = &ipv6_devconf.seg6_enabled,
6825 .maxlen = sizeof(int),
6826 .mode = 0644,
6827 .proc_handler = proc_dointvec,
6828 },
bf355b8d
DL		 6829#ifdef CONFIG_IPV6_SEG6_HMAC
6830 {
6831 .procname = "seg6_require_hmac",
6832 .data = &ipv6_devconf.seg6_require_hmac,
6833 .maxlen = sizeof(int),
6834 .mode = 0644,
6835 .proc_handler = proc_dointvec,
6836 },
6837#endif
adc176c5
EN		 6838 {
6839 .procname = "enhanced_dad",
6840 .data = &ipv6_devconf.enhanced_dad,
6841 .maxlen = sizeof(int),
6842 .mode = 0644,
6843 .proc_handler = proc_dointvec,
6844 },
d35a00b8
FJ		 6845 {
6846 .procname = "addr_gen_mode",
6847 .data = &ipv6_devconf.addr_gen_mode,
6848 .maxlen = sizeof(int),
6849 .mode = 0644,
6850 .proc_handler = addrconf_sysctl_addr_gen_mode,
6851 },
df789fe7
DF		 6852 {
6853 .procname = "disable_policy",
6854 .data = &ipv6_devconf.disable_policy,
6855 .maxlen = sizeof(int),
6856 .mode = 0644,
6857 .proc_handler = addrconf_sysctl_disable_policy,
6858 },
2210d6b2
MŻ		 6859 {
6860 .procname = "ndisc_tclass",
6861 .data = &ipv6_devconf.ndisc_tclass,
6862 .maxlen = sizeof(int),
6863 .mode = 0644,
6864 .proc_handler = proc_dointvec_minmax,
eec4844f 6865 .extra1 = (void *)SYSCTL_ZERO,
2210d6b2
MŻ		 6866 .extra2 = (void *)&two_five_five,
6867 },
8610c7c6
AA		 6868 {
6869 .procname = "rpl_seg_enabled",
6870 .data = &ipv6_devconf.rpl_seg_enabled,
6871 .maxlen = sizeof(int),
6872 .mode = 0644,
6873 .proc_handler = proc_dointvec,
6874 },
5df1f77f
KK		 6875 {
6876 /* sentinel */
6877 }
1da177e4
LT		 6878};
6879
bff16c2f 6880static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 6881 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4 6882{
29c994e3 6883 int i, ifindex;
607ea7cd 6884 struct ctl_table *table;
6105e293 6885 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 6886
607ea7cd
KK		 6887 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6888 if (!table)
f68635e6
PE		 6889 goto out;
6890
607ea7cd
KK		 6891 for (i = 0; table[i].data; i++) {
6892 table[i].data += (char *)p - (char *)&ipv6_devconf;
cb9e684e
MŻ		 6893 /* If one of these is already set, then it is not safe to
6894 * overwrite either of them: this makes proc_dointvec_minmax
6895 * usable.
6896 */
6897 if (!table[i].extra1 && !table[i].extra2) {
6898 table[i].extra1 = idev; /* embedded; no ref */
6899 table[i].extra2 = net;
6900 }
1da177e4 6901 }
1da177e4 6902
6105e293 6903 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 6904
607ea7cd
KK		 6905 p->sysctl_header = register_net_sysctl(net, path, table);
6906 if (!p->sysctl_header)
6105e293 6907 goto free;
f68635e6 6908
29c994e3
ND		 6909 if (!strcmp(dev_name, "all"))
6910 ifindex = NETCONFA_IFINDEX_ALL;
6911 else if (!strcmp(dev_name, "default"))
6912 ifindex = NETCONFA_IFINDEX_DEFAULT;
6913 else
6914 ifindex = idev->dev->ifindex;
85b3daad
DA		 6915 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6916 ifindex, p);
95897312 6917 return 0;
1da177e4 6918
f68635e6 6919free:
607ea7cd 6920 kfree(table);
f68635e6 6921out:
95897312 6922 return -ENOBUFS;
1da177e4
LT		 6923}
6924
23452170
DA		 6925static void __addrconf_sysctl_unregister(struct net *net,
6926 struct ipv6_devconf *p, int ifindex)
408c4768 6927{
607ea7cd 6928 struct ctl_table *table;
408c4768 6929
607ea7cd 6930 if (!p->sysctl_header)
408c4768
PE		 6931 return;
6932
607ea7cd
KK		 6933 table = p->sysctl_header->ctl_table_arg;
6934 unregister_net_sysctl_table(p->sysctl_header);
6935 p->sysctl_header = NULL;
6936 kfree(table);
23452170
DA		 6937
6938 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
408c4768
PE		 6939}
6940
a317a2f1 6941static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 6942{
a317a2f1
WC		 6943 int err;
6944
6945 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6946 return -EINVAL;
6947
6948 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6949 &ndisc_ifinfo_sysctl_change);
6950 if (err)
6951 return err;
6952 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6953 idev, &idev->cnf);
6954 if (err)
6955 neigh_sysctl_unregister(idev->nd_parms);
6956
6957 return err;
f52295a9
PE		 6958}
6959
408c4768 6960static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 6961{
23452170
DA		 6962 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6963 idev->dev->ifindex);
408c4768 6964 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 6965}
6966
6967
6968#endif
6969
2c8c1e72 6970static int __net_init addrconf_init_net(struct net *net)
e0da5a48 6971{
a79ca223 6972 int err = -ENOMEM;
e0da5a48
PE		 6973 struct ipv6_devconf *all, *dflt;
6974
a79ca223 6975 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 6976 if (!all)
a79ca223 6977 goto err_alloc_all;
e0da5a48 6978
a79ca223 6979 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 6980 if (!dflt)
a79ca223 6981 goto err_alloc_dflt;
e0da5a48 6982
a154d5d8 6983 if (IS_ENABLED(CONFIG_SYSCTL) &&
9efd6a3c
ND		 6984 !net_eq(net, &init_net)) {
6985 switch (sysctl_devconf_inherit_init_net) {
6986 case 1: /* copy from init_net */
6987 memcpy(all, init_net.ipv6.devconf_all,
6988 sizeof(ipv6_devconf));
6989 memcpy(dflt, init_net.ipv6.devconf_dflt,
6990 sizeof(ipv6_devconf_dflt));
6991 break;
6992 case 3: /* copy from the current netns */
6993 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all,
6994 sizeof(ipv6_devconf));
6995 memcpy(dflt,
6996 current->nsproxy->net_ns->ipv6.devconf_dflt,
6997 sizeof(ipv6_devconf_dflt));
6998 break;
6999 case 0:
7000 case 2:
7001 /* use compiled values */
7002 break;
7003 }
856c395c
CW		 7004 }
7005
a79ca223
HZ		 7006 /* these will be inherited by all namespaces */
7007 dflt->autoconf = ipv6_defaults.autoconf;
7008 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 7009
3d1bec99
HFS		 7010 dflt->stable_secret.initialized = false;
7011 all->stable_secret.initialized = false;
7012
e0da5a48
PE		 7013 net->ipv6.devconf_all = all;
7014 net->ipv6.devconf_dflt = dflt;
7015
7016#ifdef CONFIG_SYSCTL
f8572d8f 7017 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 7018 if (err < 0)
7019 goto err_reg_all;
7020
f8572d8f 7021 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 7022 if (err < 0)
7023 goto err_reg_dflt;
7024#endif
7025 return 0;
7026
7027#ifdef CONFIG_SYSCTL
7028err_reg_dflt:
23452170 7029 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
e0da5a48
PE		 7030err_reg_all:
7031 kfree(dflt);
7032#endif
7033err_alloc_dflt:
7034 kfree(all);
7035err_alloc_all:
7036 return err;
7037}
7038
2c8c1e72 7039static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 7040{
7041#ifdef CONFIG_SYSCTL
23452170
DA		 7042 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7043 NETCONFA_IFINDEX_DEFAULT);
7044 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7045 NETCONFA_IFINDEX_ALL);
e0da5a48 7046#endif
73cf0e92 7047 kfree(net->ipv6.devconf_dflt);
7048 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 7049}
7050
7051static struct pernet_operations addrconf_ops = {
7052 .init = addrconf_init_net,
7053 .exit = addrconf_exit_net,
7054};
7055
207895fd 7056static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 7057 .family = AF_INET6,
7058 .fill_link_af = inet6_fill_link_af,
7059 .get_link_af_size = inet6_get_link_af_size,
11b1f828 7060 .validate_link_af = inet6_validate_link_af,
f53adae4 7061 .set_link_af = inet6_set_link_af,
b382b191
TG		 7062};
7063
1da177e4
LT		 7064/*
7065 * Init / cleanup code
7066 */
7067
7068int __init addrconf_init(void)
7069{
a317a2f1 7070 struct inet6_dev *idev;
c2e21293 7071 int i, err;
2a8cc6c8 7072
e21e8467
SH		 7073 err = ipv6_addr_label_init();
7074 if (err < 0) {
f3213831
JP		 7075 pr_crit("%s: cannot initialize default policy table: %d\n",
7076 __func__, err);
2cc6d2bf 7077 goto out;
2a8cc6c8 7078 }
1da177e4 7079
2cc6d2bf
NH		 7080 err = register_pernet_subsys(&addrconf_ops);
7081 if (err < 0)
7082 goto out_addrlabel;
e0da5a48 7083
c15b1cca
HFS		 7084 addrconf_wq = create_workqueue("ipv6_addrconf");
7085 if (!addrconf_wq) {
7086 err = -ENOMEM;
7087 goto out_nowq;
7088 }
7089
1da177e4
LT		 7090 /* The addrconf netdev notifier requires that loopback_dev
7091 * has it's ipv6 private information allocated and setup
7092 * before it can bring up and give link-local addresses
7093 * to other devices which are up.
7094 *
7095 * Unfortunately, loopback_dev is not necessarily the first
7096 * entry in the global dev_base list of net devices. In fact,
7097 * it is likely to be the very last entry on that list.
7098 * So this causes the notifier registry below to try and
7099 * give link-local addresses to all devices besides loopback_dev
7100 * first, then loopback_dev, which cases all the non-loopback_dev
7101 * devices to fail to get a link-local address.
7102 *
7103 * So, as a temporary fix, allocate the ipv6 structure for
7104 * loopback_dev first by hand.
7105 * Longer term, all of the dependencies ipv6 has upon the loopback
7106 * device and it being up should be removed.
7107 */
7108 rtnl_lock();
a317a2f1 7109 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 7110 rtnl_unlock();
a317a2f1
WC		 7111 if (IS_ERR(idev)) {
7112 err = PTR_ERR(idev);
e0da5a48 7113 goto errlo;
a317a2f1 7114 }
1da177e4 7115
2f460933
WC		 7116 ip6_route_init_special_entries();
7117
c2e21293 7118 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7119 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
7120
1da177e4
LT		 7121 register_netdevice_notifier(&ipv6_dev_notf);
7122
c15b1cca 7123 addrconf_verify();
c127ea2c 7124
3678a9d8 7125 rtnl_af_register(&inet6_ops);
b382b191 7126
16feebcf
FW		 7127 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7128 NULL, inet6_dump_ifinfo, 0);
c127ea2c
TG		 7129 if (err < 0)
7130 goto errout;
7131
16feebcf
FW		 7132 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7133 inet6_rtm_newaddr, NULL, 0);
7134 if (err < 0)
7135 goto errout;
7136 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7137 inet6_rtm_deladdr, NULL, 0);
7138 if (err < 0)
7139 goto errout;
7140 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7141 inet6_rtm_getaddr, inet6_dump_ifaddr,
7142 RTNL_FLAG_DOIT_UNLOCKED);
7143 if (err < 0)
7144 goto errout;
7145 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7146 NULL, inet6_dump_ifmcaddr, 0);
7147 if (err < 0)
7148 goto errout;
7149 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7150 NULL, inet6_dump_ifacaddr, 0);
7151 if (err < 0)
7152 goto errout;
7153 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7154 inet6_netconf_get_devconf,
7155 inet6_netconf_dump_devconf,
7156 RTNL_FLAG_DOIT_UNLOCKED);
7157 if (err < 0)
7158 goto errout;
a3fde2ad
FW		 7159 err = ipv6_addr_label_rtnl_register();
7160 if (err < 0)
7161 goto errout;
2a8cc6c8 7162
1da177e4 7163 return 0;
c127ea2c 7164errout:
16feebcf 7165 rtnl_unregister_all(PF_INET6);
b382b191 7166 rtnl_af_unregister(&inet6_ops);
c127ea2c 7167 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 7168errlo:
c15b1cca
HFS		 7169 destroy_workqueue(addrconf_wq);
7170out_nowq:
e0da5a48 7171 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 7172out_addrlabel:
7173 ipv6_addr_label_cleanup();
7174out:
c127ea2c 7175 return err;
1da177e4
LT		 7176}
7177
09f7709f 7178void addrconf_cleanup(void)
1da177e4 7179{
176c39af 7180 struct net_device *dev;
1da177e4
LT		 7181 int i;
7182
7183 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 7184 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 7185 ipv6_addr_label_cleanup();
1da177e4 7186
5c45121d 7187 rtnl_af_unregister(&inet6_ops);
1da177e4 7188
5c45121d 7189 rtnl_lock();
b382b191 7190
176c39af
DL		 7191 /* clean dev list */
7192 for_each_netdev(&init_net, dev) {
7193 if (__in6_dev_get(dev) == NULL)
7194 continue;
7195 addrconf_ifdown(dev, 1);
7196 }
7197 addrconf_ifdown(init_net.loopback_dev, 2);
7198
1da177e4
LT		 7199 /*
7200 * Check hash table.
7201 */
5c578aed 7202 spin_lock_bh(&addrconf_hash_lock);
c2e21293 7203 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7204 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 7205 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 7206 cancel_delayed_work(&addr_chk_work);
1da177e4 7207 rtnl_unlock();
c15b1cca
HFS		 7208
7209 destroy_workqueue(addrconf_wq);
1da177e4 7210}
Linux 6.x block layer and io_uring tree(s)