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UBUNTU: Ubuntu-5.4.0-117.132
[mirror_ubuntu-focal-kernel.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
9d6280da
JB		 138static void ipv6_regen_rndid(struct inet6_dev *idev);
139static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 140
1b34be74 141static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
d9bf82c2 142static int ipv6_count_addresses(const struct inet6_dev *idev);
622c81d5
HFS		 143static int ipv6_generate_stable_address(struct in6_addr *addr,
144 u8 dad_count,
145 const struct inet6_dev *idev);
1da177e4 146
27c565ae
ED		 147#define IN6_ADDR_HSIZE_SHIFT 8
148#define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
1da177e4
LT		 149/*
150 * Configured unicast address hash table
151 */
c2e21293 152static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 153static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 154
c15b1cca
HFS		 155static void addrconf_verify(void);
156static void addrconf_verify_rtnl(void);
157static void addrconf_verify_work(struct work_struct *);
1da177e4 158
c15b1cca
HFS		 159static struct workqueue_struct *addrconf_wq;
160static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 161
162static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
163static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
164
93d9b7d7
JP		 165static void addrconf_type_change(struct net_device *dev,
166 unsigned long event);
1da177e4
LT		 167static int addrconf_ifdown(struct net_device *dev, int how);
168
8d1c802b 169static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
21caa662
RK		 170 int plen,
171 const struct net_device *dev,
2b2450ca
DA		 172 u32 flags, u32 noflags,
173 bool no_gw);
21caa662 174
cf22f9a2 175static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 176static void addrconf_dad_work(struct work_struct *w);
c76fe2d9
DA		 177static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
178 bool send_na);
896585d4 179static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
e99e88a9 180static void addrconf_rs_timer(struct timer_list *t);
1da177e4
LT		 181static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
182static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
183
1ab1457c 184static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 185 struct prefix_info *pinfo);
1da177e4 186
888c848e 187static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 188 .forwarding = 0,
189 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
190 .mtu6 = IPV6_MIN_MTU,
191 .accept_ra = 1,
192 .accept_redirects = 1,
193 .autoconf = 1,
194 .force_mld_version = 0,
fc4eba58
HFS		 195 .mldv1_unsolicited_report_interval = 10 * HZ,
196 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 197 .dad_transmits = 1,
198 .rtr_solicits = MAX_RTR_SOLICITATIONS,
199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 200 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 201 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 202 .use_tempaddr = 0,
1da177e4
LT		 203 .temp_valid_lft = TEMP_VALID_LIFETIME,
204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
205 .regen_max_retry = REGEN_MAX_RETRY,
206 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 207 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 208 .accept_ra_defrtr = 1,
d9333196 209 .accept_ra_from_local = 0,
8013d1d7 210 .accept_ra_min_hop_limit= 1,
c4fd30eb 211 .accept_ra_pinfo = 1,
930d6ff2
YH		 212#ifdef CONFIG_IPV6_ROUTER_PREF
213 .accept_ra_rtr_pref = 1,
52e16356 214 .rtr_probe_interval = 60 * HZ,
09c884d4 215#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 216 .accept_ra_rt_info_min_plen = 0,
09c884d4
YH		 217 .accept_ra_rt_info_max_plen = 0,
218#endif
930d6ff2 219#endif
fbea49e1 220 .proxy_ndp = 0,
0bcbc926 221 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 222 .disable_ipv6 = 0,
09400953 223 .accept_dad = 0,
b800c3b9 224 .suppress_frag_ndisc = 1,
c2943f14 225 .accept_ra_mtu = 1,
3d1bec99
HFS		 226 .stable_secret = {
227 .initialized = false,
3985e8a3
EK		 228 },
229 .use_oif_addrs_only = 0,
35103d11 230 .ignore_routes_with_linkdown = 0,
f1705ec1 231 .keep_addr_on_down = 0,
1ababeba 232 .seg6_enabled = 0,
bf355b8d
DL		 233#ifdef CONFIG_IPV6_SEG6_HMAC
234 .seg6_require_hmac = 0,
235#endif
adc176c5 236 .enhanced_dad = 1,
d35a00b8 237 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
df789fe7 238 .disable_policy = 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,
1da177e4
LT		 293};
294
1f372c7b
MM		 295/* Check if link is ready: is it up and is a valid qdisc available */
296static inline bool addrconf_link_ready(const struct net_device *dev)
f24e3d65 297{
1f372c7b 298 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
f24e3d65
MC		 299}
300
b7b1bfce 301static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 302{
b7b1bfce
HFS		 303 if (del_timer(&idev->rs_timer))
304 __in6_dev_put(idev);
305}
306
c15b1cca 307static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 308{
c15b1cca 309 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 310 __in6_ifa_put(ifp);
311}
312
b7b1bfce
HFS		 313static void addrconf_mod_rs_timer(struct inet6_dev *idev,
314 unsigned long when)
315{
316 if (!timer_pending(&idev->rs_timer))
317 in6_dev_hold(idev);
318 mod_timer(&idev->rs_timer, jiffies + when);
319}
1da177e4 320
c15b1cca
HFS		 321static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
322 unsigned long delay)
1da177e4 323{
f8a894b2
XL		 324 in6_ifa_hold(ifp);
325 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
326 in6_ifa_put(ifp);
1da177e4
LT		 327}
328
7f7d9a6b
HX		 329static int snmp6_alloc_dev(struct inet6_dev *idev)
330{
827da44c
JS		 331 int i;
332
698365fa
WC		 333 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
334 if (!idev->stats.ipv6)
7f7d9a6b 335 goto err_ip;
827da44c
JS		 336
337 for_each_possible_cpu(i) {
338 struct ipstats_mib *addrconf_stats;
698365fa 339 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 340 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 341 }
342
343
be281e55
ED		 344 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
345 GFP_KERNEL);
346 if (!idev->stats.icmpv6dev)
7f7d9a6b 347 goto err_icmp;
be281e55
ED		 348 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
349 GFP_KERNEL);
350 if (!idev->stats.icmpv6msgdev)
14878f75 351 goto err_icmpmsg;
7f7d9a6b
HX		 352
353 return 0;
354
14878f75 355err_icmpmsg:
be281e55 356 kfree(idev->stats.icmpv6dev);
7f7d9a6b 357err_icmp:
698365fa 358 free_percpu(idev->stats.ipv6);
7f7d9a6b 359err_ip:
aaf70ec7 360 return -ENOMEM;
7f7d9a6b
HX		 361}
362
8e5e8f30 363static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 364{
365 struct inet6_dev *ndev;
a317a2f1 366 int err = -ENOMEM;
1da177e4
LT		 367
368 ASSERT_RTNL();
369
370 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 371 return ERR_PTR(-EINVAL);
1da177e4 372
1ab1457c 373 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
63159f29 374 if (!ndev)
a317a2f1 375 return ERR_PTR(err);
322f74a4
IO		 376
377 rwlock_init(&ndev->lock);
378 ndev->dev = dev;
502a2ffd 379 INIT_LIST_HEAD(&ndev->addr_list);
e99e88a9 380 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
c346dca1 381 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
9b29c696
HFS		 382
383 if (ndev->cnf.stable_secret.initialized)
d35a00b8 384 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
9b29c696 385
322f74a4 386 ndev->cnf.mtu6 = dev->mtu;
322f74a4 387 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
63159f29 388 if (!ndev->nd_parms) {
322f74a4 389 kfree(ndev);
a317a2f1 390 return ERR_PTR(err);
322f74a4 391 }
0187bdfb
BH		 392 if (ndev->cnf.forwarding)
393 dev_disable_lro(dev);
322f74a4
IO		 394 /* We refer to the device */
395 dev_hold(dev);
1da177e4 396
322f74a4 397 if (snmp6_alloc_dev(ndev) < 0) {
e32ac250
JP		 398 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
399 __func__);
322f74a4 400 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 401 dev_put(dev);
402 kfree(ndev);
a317a2f1 403 return ERR_PTR(err);
322f74a4 404 }
1da177e4 405
322f74a4 406 if (snmp6_register_dev(ndev) < 0) {
e32ac250
JP		 407 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
408 __func__, dev->name);
a317a2f1 409 goto err_release;
322f74a4
IO		 410 }
411
9d6280da 412 /* One reference from device. */
1be92460 413 refcount_set(&ndev->refcnt, 1);
1da177e4 414
1b34be74
YH		 415 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
416 ndev->cnf.accept_dad = -1;
417
07a93626 418#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 419 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 420 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 421 ndev->cnf.rtr_solicits = 0;
422 }
423#endif
424
372e6c8f 425 INIT_LIST_HEAD(&ndev->tempaddr_list);
76506a98 426 ndev->desync_factor = U32_MAX;
322f74a4
IO		 427 if ((dev->flags&IFF_LOOPBACK) ||
428 dev->type == ARPHRD_TUNNEL ||
9625ed72 429 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 430 dev->type == ARPHRD_SIT ||
0be669bb 431 dev->type == ARPHRD_NONE) {
322f74a4 432 ndev->cnf.use_tempaddr = -1;
9d6280da
JB		 433 } else
434 ipv6_regen_rndid(ndev);
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 544 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
98fa2c07 545 atomic_read(&devconf->mc_forwarding)) < 0)
d67b8c61 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
18dbe65c
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
18dbe65c
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)
93c2fb25 1239 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
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,
18dbe65c 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
fffcefe9
ED		 1307static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp,
1308 struct inet6_ifaddr *ift,
1309 bool block)
1da177e4
LT		 1310{
1311 struct inet6_dev *idev = ifp->idev;
1312 struct in6_addr addr, *tmpaddr;
e6464b8c 1313 unsigned long tmp_tstamp, age;
eac55bf9 1314 unsigned long regen_advance;
e6464b8c 1315 struct ifa6_config cfg;
1da177e4 1316 int ret = 0;
76f793e3 1317 unsigned long now = jiffies;
76506a98 1318 long max_desync_factor;
7aa8e63f 1319 s32 cnf_temp_preferred_lft;
1da177e4 1320
53bd6749 1321 write_lock_bh(&idev->lock);
1da177e4
LT		 1322 if (ift) {
1323 spin_lock_bh(&ift->lock);
1324 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1325 spin_unlock_bh(&ift->lock);
1326 tmpaddr = &addr;
1327 } else {
1328 tmpaddr = NULL;
1329 }
1330retry:
1331 in6_dev_hold(idev);
1332 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1333 write_unlock_bh(&idev->lock);
f3213831 1334 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1335 in6_dev_put(idev);
1336 ret = -1;
1337 goto out;
1338 }
1339 spin_lock_bh(&ifp->lock);
1340 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1341 idev->cnf.use_tempaddr = -1; /*XXX*/
1342 spin_unlock_bh(&ifp->lock);
53bd6749 1343 write_unlock_bh(&idev->lock);
f3213831
JP		 1344 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1345 __func__);
1da177e4
LT		 1346 in6_dev_put(idev);
1347 ret = -1;
1348 goto out;
1349 }
1350 in6_ifa_hold(ifp);
1351 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
9d6280da 1352 ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1353 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1354 age = (now - ifp->tstamp) / HZ;
76506a98
JB		 1355
1356 regen_advance = idev->cnf.regen_max_retry *
1357 idev->cnf.dad_transmits *
1358 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1359
1360 /* recalculate max_desync_factor each time and update
1361 * idev->desync_factor if it's larger
1362 */
7aa8e63f 1363 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
76506a98
JB		 1364 max_desync_factor = min_t(__u32,
1365 idev->cnf.max_desync_factor,
7aa8e63f 1366 cnf_temp_preferred_lft - regen_advance);
76506a98
JB		 1367
1368 if (unlikely(idev->desync_factor > max_desync_factor)) {
1369 if (max_desync_factor > 0) {
1370 get_random_bytes(&idev->desync_factor,
1371 sizeof(idev->desync_factor));
1372 idev->desync_factor %= max_desync_factor;
1373 } else {
1374 idev->desync_factor = 0;
1375 }
1376 }
1377
3f2d67b6 1378 memset(&cfg, 0, sizeof(cfg));
e6464b8c 1379 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
7a876b0e 1380 idev->cnf.temp_valid_lft + age);
e6464b8c
DA		 1381 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1382 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1383
1384 cfg.plen = ifp->prefix_len;
1da177e4
LT		 1385 tmp_tstamp = ifp->tstamp;
1386 spin_unlock_bh(&ifp->lock);
1387
53bd6749 1388 write_unlock_bh(&idev->lock);
95c385b4 1389
eac55bf9
BB		 1390 /* A temporary address is created only if this calculated Preferred
1391 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1392 * an implementation must not create a temporary address with a zero
1393 * Preferred Lifetime.
ecab6701
HK		 1394 * Use age calculation as in addrconf_verify to avoid unnecessary
1395 * temporary addresses being generated.
eac55bf9 1396 */
ecab6701 1397 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
e6464b8c 1398 if (cfg.preferred_lft <= regen_advance + age) {
eac55bf9
BB		 1399 in6_ifa_put(ifp);
1400 in6_dev_put(idev);
1401 ret = -1;
1402 goto out;
1403 }
1404
e6464b8c 1405 cfg.ifa_flags = IFA_F_TEMPORARY;
95c385b4
NH		 1406 /* set in addrconf_prefix_rcv() */
1407 if (ifp->flags & IFA_F_OPTIMISTIC)
e6464b8c 1408 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
95c385b4 1409
e6464b8c
DA		 1410 cfg.pfx = &addr;
1411 cfg.scope = ipv6_addr_scope(cfg.pfx);
95c385b4 1412
e6464b8c 1413 ift = ipv6_add_addr(idev, &cfg, block, NULL);
4b08a8f1 1414 if (IS_ERR(ift)) {
1da177e4
LT		 1415 in6_ifa_put(ifp);
1416 in6_dev_put(idev);
f3213831 1417 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1418 tmpaddr = &addr;
53bd6749 1419 write_lock_bh(&idev->lock);
1da177e4
LT		 1420 goto retry;
1421 }
1422
1423 spin_lock_bh(&ift->lock);
1424 ift->ifpub = ifp;
76f793e3 1425 ift->cstamp = now;
1da177e4
LT		 1426 ift->tstamp = tmp_tstamp;
1427 spin_unlock_bh(&ift->lock);
1428
cf22f9a2 1429 addrconf_dad_start(ift);
1da177e4
LT		 1430 in6_ifa_put(ift);
1431 in6_dev_put(idev);
1432out:
1433 return ret;
1434}
1da177e4
LT		 1435
1436/*
072047e4 1437 * Choose an appropriate source address (RFC3484)
1da177e4 1438 */
a9b05723
YH		 1439enum {
1440 IPV6_SADDR_RULE_INIT = 0,
1441 IPV6_SADDR_RULE_LOCAL,
1442 IPV6_SADDR_RULE_SCOPE,
1443 IPV6_SADDR_RULE_PREFERRED,
1444#ifdef CONFIG_IPV6_MIP6
1445 IPV6_SADDR_RULE_HOA,
1446#endif
1447 IPV6_SADDR_RULE_OIF,
1448 IPV6_SADDR_RULE_LABEL,
a9b05723 1449 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1450 IPV6_SADDR_RULE_ORCHID,
1451 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1452#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1453 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1454#endif
a9b05723
YH		 1455 IPV6_SADDR_RULE_MAX
1456};
1457
072047e4 1458struct ipv6_saddr_score {
a9b05723
YH		 1459 int rule;
1460 int addr_type;
1461 struct inet6_ifaddr *ifa;
1462 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1463 int scopedist;
1464 int matchlen;
072047e4
YH		 1465};
1466
a9b05723 1467struct ipv6_saddr_dst {
9acd9f3a 1468 const struct in6_addr *addr;
a9b05723
YH		 1469 int ifindex;
1470 int scope;
1471 int label;
7cbca67c 1472 unsigned int prefs;
a9b05723 1473};
072047e4 1474
b6f99a21 1475static inline int ipv6_saddr_preferred(int type)
1da177e4 1476{
45bb0060 1477 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1478 return 1;
1479 return 0;
1da177e4
LT		 1480}
1481
35e015e1
MC		 1482static bool ipv6_use_optimistic_addr(struct net *net,
1483 struct inet6_dev *idev)
7fd2561e
EK		 1484{
1485#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 1486 if (!idev)
1487 return false;
1488 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1489 return false;
1490 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1491 return false;
1492
1493 return true;
7fd2561e
EK		 1494#else
1495 return false;
1496#endif
1497}
1498
f1c02cfb
SD		 1499static bool ipv6_allow_optimistic_dad(struct net *net,
1500 struct inet6_dev *idev)
1501{
1502#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1503 if (!idev)
1504 return false;
1505 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1506 return false;
1507
1508 return true;
1509#else
1510 return false;
1511#endif
1512}
1513
3de23255
BT		 1514static int ipv6_get_saddr_eval(struct net *net,
1515 struct ipv6_saddr_score *score,
a9b05723
YH		 1516 struct ipv6_saddr_dst *dst,
1517 int i)
1518{
1519 int ret;
1520
1521 if (i <= score->rule) {
1522 switch (i) {
1523 case IPV6_SADDR_RULE_SCOPE:
1524 ret = score->scopedist;
1525 break;
1526 case IPV6_SADDR_RULE_PREFIX:
1527 ret = score->matchlen;
1528 break;
1529 default:
1530 ret = !!test_bit(i, score->scorebits);
1531 }
1532 goto out;
1533 }
1534
1535 switch (i) {
1536 case IPV6_SADDR_RULE_INIT:
1537 /* Rule 0: remember if hiscore is not ready yet */
1538 ret = !!score->ifa;
1539 break;
1540 case IPV6_SADDR_RULE_LOCAL:
1541 /* Rule 1: Prefer same address */
1542 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1543 break;
1544 case IPV6_SADDR_RULE_SCOPE:
1545 /* Rule 2: Prefer appropriate scope
1546 *
1547 * ret
1548 * ^
1549 * -1 | d 15
1550 * ---+--+-+---> scope
1551 * |
1552 * | d is scope of the destination.
1553 * B-d | \
1554 * | \ <- smaller scope is better if
db9c7c39 1555 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1556 * | ret = B - scope (-1 <= scope >= d <= 15).
1557 * d-C-1 | /
1558 * |/ <- greater is better
1559 * -C / if scope is not enough for destination.
1560 * /| ret = scope - C (-1 <= d < scope <= 15).
1561 *
1562 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1563 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1564 * Assume B = 0 and we get C > 29.
1565 */
1566 ret = __ipv6_addr_src_scope(score->addr_type);
1567 if (ret >= dst->scope)
1568 ret = -ret;
1569 else
1570 ret -= 128; /* 30 is enough */
1571 score->scopedist = ret;
1572 break;
1573 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1574 {
a9b05723 1575 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1576 u8 avoid = IFA_F_DEPRECATED;
1577
35e015e1 1578 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
7fd2561e 1579 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1580 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1581 !(score->ifa->flags & avoid);
a9b05723 1582 break;
7fd2561e 1583 }
a9b05723
YH		 1584#ifdef CONFIG_IPV6_MIP6
1585 case IPV6_SADDR_RULE_HOA:
7cbca67c 1586 {
a9b05723 1587 /* Rule 4: Prefer home address */
7cbca67c
YH		 1588 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1589 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1590 break;
7cbca67c 1591 }
a9b05723
YH		 1592#endif
1593 case IPV6_SADDR_RULE_OIF:
1594 /* Rule 5: Prefer outgoing interface */
1595 ret = (!dst->ifindex ||
1596 dst->ifindex == score->ifa->idev->dev->ifindex);
1597 break;
1598 case IPV6_SADDR_RULE_LABEL:
1599 /* Rule 6: Prefer matching label */
3de23255
BT		 1600 ret = ipv6_addr_label(net,
1601 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1602 score->ifa->idev->dev->ifindex) == dst->label;
1603 break;
a9b05723 1604 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1605 {
a9b05723 1606 /* Rule 7: Prefer public address
25985edc 1607 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1608 */
7cbca67c
YH		 1609 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1610 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1611 score->ifa->idev->cnf.use_tempaddr >= 2;
1612 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1613 break;
7cbca67c 1614 }
a9b05723
YH		 1615 case IPV6_SADDR_RULE_ORCHID:
1616 /* Rule 8-: Prefer ORCHID vs ORCHID or
1617 * non-ORCHID vs non-ORCHID
1618 */
1619 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1620 ipv6_addr_orchid(dst->addr));
1621 break;
1622 case IPV6_SADDR_RULE_PREFIX:
1623 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1624 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1625 if (ret > score->ifa->prefix_len)
1626 ret = score->ifa->prefix_len;
1627 score->matchlen = ret;
a9b05723 1628 break;
7fd2561e
EK		 1629#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1630 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1631 /* Optimistic addresses still have lower precedence than other
1632 * preferred addresses.
1633 */
1634 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1635 break;
1636#endif
a9b05723
YH		 1637 default:
1638 ret = 0;
1639 }
1640
1641 if (ret)
1642 __set_bit(i, score->scorebits);
1643 score->rule = i;
1644out:
1645 return ret;
1646}
1647
c0b8da1e
YH		 1648static int __ipv6_dev_get_saddr(struct net *net,
1649 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1650 struct inet6_dev *idev,
1651 struct ipv6_saddr_score *scores,
1652 int hiscore_idx)
9131f3de 1653{
c0b8da1e 1654 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de 1655
f59c031e 1656 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
9131f3de
YH		 1657 int i;
1658
1659 /*
1660 * - Tentative Address (RFC2462 section 5.4)
1661 * - A tentative address is not considered
1662 * "assigned to an interface" in the traditional
1663 * sense, unless it is also flagged as optimistic.
1664 * - Candidate Source Address (section 4)
1665 * - In any case, anycast addresses, multicast
1666 * addresses, and the unspecified address MUST
1667 * NOT be included in a candidate set.
1668 */
1669 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1670 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1671 continue;
1672
1673 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1674
1675 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1676 score->addr_type & IPV6_ADDR_MULTICAST)) {
1677 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1678 idev->dev->name);
1679 continue;
1680 }
1681
1682 score->rule = -1;
1683 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1684
1685 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1686 int minihiscore, miniscore;
1687
1688 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1689 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1690
1691 if (minihiscore > miniscore) {
1692 if (i == IPV6_SADDR_RULE_SCOPE &&
1693 score->scopedist > 0) {
1694 /*
1695 * special case:
1696 * each remaining entry
1697 * has too small (not enough)
1698 * scope, because ifa entries
1699 * are sorted by their scope
1700 * values.
1701 */
1702 goto out;
1703 }
1704 break;
1705 } else if (minihiscore < miniscore) {
9131f3de 1706 swap(hiscore, score);
c0b8da1e 1707 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1708
1709 /* restore our iterator */
1710 score->ifa = hiscore->ifa;
1711
1712 break;
1713 }
1714 }
1715 }
1716out:
c0b8da1e 1717 return hiscore_idx;
9131f3de
YH		 1718}
1719
afbac601
DA		 1720static int ipv6_get_saddr_master(struct net *net,
1721 const struct net_device *dst_dev,
1722 const struct net_device *master,
1723 struct ipv6_saddr_dst *dst,
1724 struct ipv6_saddr_score *scores,
1725 int hiscore_idx)
1726{
1727 struct inet6_dev *idev;
1728
1729 idev = __in6_dev_get(dst_dev);
1730 if (idev)
1731 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1732 scores, hiscore_idx);
1733
1734 idev = __in6_dev_get(master);
1735 if (idev)
1736 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1737 scores, hiscore_idx);
1738
1739 return hiscore_idx;
1740}
1741
b3f644fc 1742int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1743 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1744 struct in6_addr *saddr)
1da177e4 1745{
c0b8da1e 1746 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1747 struct ipv6_saddr_dst dst;
9131f3de 1748 struct inet6_dev *idev;
072047e4 1749 struct net_device *dev;
a9b05723 1750 int dst_type;
9131f3de 1751 bool use_oif_addr = false;
c0b8da1e 1752 int hiscore_idx = 0;
cc429c8f 1753 int ret = 0;
1da177e4 1754
a9b05723
YH		 1755 dst_type = __ipv6_addr_type(daddr);
1756 dst.addr = daddr;
1757 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1758 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1759 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1760 dst.prefs = prefs;
a9b05723 1761
c0b8da1e
YH		 1762 scores[hiscore_idx].rule = -1;
1763 scores[hiscore_idx].ifa = NULL;
1da177e4 1764
8814c4b5 1765 rcu_read_lock();
1da177e4 1766
9131f3de
YH		 1767 /* Candidate Source Address (section 4)
1768 * - multicast and link-local destination address,
1769 * the set of candidate source address MUST only
1770 * include addresses assigned to interfaces
1771 * belonging to the same link as the outgoing
1772 * interface.
1773 * (- For site-local destination addresses, the
1774 * set of candidate source addresses MUST only
1775 * include addresses assigned to interfaces
1776 * belonging to the same site as the outgoing
1777 * interface.)
3985e8a3
EK		 1778 * - "It is RECOMMENDED that the candidate source addresses
1779 * be the set of unicast addresses assigned to the
1780 * interface that will be used to send to the destination
1781 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1782 */
1783 if (dst_dev) {
3985e8a3 1784 idev = __in6_dev_get(dst_dev);
9131f3de 1785 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1786 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1787 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1788 use_oif_addr = true;
1789 }
1790 }
a9b05723 1791
9131f3de 1792 if (use_oif_addr) {
c0b8da1e 1793 if (idev)
c15df306 1794 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de 1795 } else {
afbac601
DA		 1796 const struct net_device *master;
1797 int master_idx = 0;
1798
1799 /* if dst_dev exists and is enslaved to an L3 device, then
1800 * prefer addresses from dst_dev and then the master over
1801 * any other enslaved devices in the L3 domain.
1802 */
1803 master = l3mdev_master_dev_rcu(dst_dev);
1804 if (master) {
1805 master_idx = master->ifindex;
1806
1807 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1808 master, &dst,
1809 scores, hiscore_idx);
1810
1811 if (scores[hiscore_idx].ifa)
1812 goto out;
1813 }
1814
9131f3de 1815 for_each_netdev_rcu(net, dev) {
afbac601
DA		 1816 /* only consider addresses on devices in the
1817 * same L3 domain
1818 */
1819 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1820 continue;
9131f3de
YH		 1821 idev = __in6_dev_get(dev);
1822 if (!idev)
072047e4 1823 continue;
c15df306 1824 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1825 }
1826 }
afbac601
DA		 1827
1828out:
c0b8da1e 1829 hiscore = &scores[hiscore_idx];
a9b05723 1830 if (!hiscore->ifa)
cc429c8f
ED		 1831 ret = -EADDRNOTAVAIL;
1832 else
1833 *saddr = hiscore->ifa->addr;
1ab1457c 1834
cc429c8f
ED		 1835 rcu_read_unlock();
1836 return ret;
1da177e4 1837}
5e5f3f0f 1838EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1839
8965779d 1840int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1841 u32 banned_flags)
b7b1bfce
HFS		 1842{
1843 struct inet6_ifaddr *ifp;
1844 int err = -EADDRNOTAVAIL;
1845
602582ca
HFS		 1846 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1847 if (ifp->scope > IFA_LINK)
1848 break;
b7b1bfce
HFS		 1849 if (ifp->scope == IFA_LINK &&
1850 !(ifp->flags & banned_flags)) {
1851 *addr = ifp->addr;
1852 err = 0;
1853 break;
1854 }
1855 }
1856 return err;
1857}
1858
95c385b4 1859int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1860 u32 banned_flags)
1da177e4
LT		 1861{
1862 struct inet6_dev *idev;
1863 int err = -EADDRNOTAVAIL;
1864
8814c4b5 1865 rcu_read_lock();
e21e8467
SH		 1866 idev = __in6_dev_get(dev);
1867 if (idev) {
1da177e4 1868 read_lock_bh(&idev->lock);
b7b1bfce 1869 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1870 read_unlock_bh(&idev->lock);
1871 }
8814c4b5 1872 rcu_read_unlock();
1da177e4
LT		 1873 return err;
1874}
1875
d9bf82c2 1876static int ipv6_count_addresses(const struct inet6_dev *idev)
1da177e4 1877{
d9bf82c2 1878 const struct inet6_ifaddr *ifp;
1da177e4 1879 int cnt = 0;
1da177e4 1880
d9bf82c2
ED		 1881 rcu_read_lock();
1882 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1da177e4 1883 cnt++;
d9bf82c2 1884 rcu_read_unlock();
1da177e4
LT		 1885 return cnt;
1886}
1887
b71d1d42 1888int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1889 const struct net_device *dev, int strict)
c58da4c6 1890{
232378e8
DA		 1891 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1892 strict, IFA_F_TENTATIVE);
c58da4c6
EK		 1893}
1894EXPORT_SYMBOL(ipv6_chk_addr);
1895
1893ff20
DA		 1896/* device argument is used to find the L3 domain of interest. If
1897 * skip_dev_check is set, then the ifp device is not checked against
1898 * the passed in dev argument. So the 2 cases for addresses checks are:
1899 * 1. does the address exist in the L3 domain that dev is part of
1900 * (skip_dev_check = true), or
1901 *
1902 * 2. does the address exist on the specific device
1903 * (skip_dev_check = false)
1904 */
c58da4c6 1905int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
232378e8
DA		 1906 const struct net_device *dev, bool skip_dev_check,
1907 int strict, u32 banned_flags)
1da177e4 1908{
3f27fb23 1909 unsigned int hash = inet6_addr_hash(net, addr);
1893ff20 1910 const struct net_device *l3mdev;
eedf042a 1911 struct inet6_ifaddr *ifp;
c58da4c6 1912 u32 ifp_flags;
1da177e4 1913
480318a0 1914 rcu_read_lock();
232378e8 1915
1893ff20 1916 l3mdev = l3mdev_master_dev_rcu(dev);
232378e8
DA		 1917 if (skip_dev_check)
1918 dev = NULL;
1919
b67bfe0d 1920 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1921 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1922 continue;
1893ff20
DA		 1923
1924 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev)
1925 continue;
1926
c58da4c6
EK		 1927 /* Decouple optimistic from tentative for evaluation here.
1928 * Ban optimistic addresses explicitly, when required.
1929 */
1930 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1931 ? (ifp->flags&~IFA_F_TENTATIVE)
1932 : ifp->flags;
1da177e4 1933 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1934 !(ifp_flags&banned_flags) &&
63159f29 1935 (!dev || ifp->idev->dev == dev ||
eedf042a 1936 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
480318a0 1937 rcu_read_unlock();
eedf042a 1938 return 1;
1da177e4
LT		 1939 }
1940 }
5c578aed 1941
480318a0 1942 rcu_read_unlock();
eedf042a 1943 return 0;
1da177e4 1944}
c58da4c6 1945EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1946
1da177e4 1947
7df37ff3
CB		 1948/* Compares an address/prefix_len with addresses on device @dev.
1949 * If one is found it returns true.
1950 */
1951bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1952 const unsigned int prefix_len, struct net_device *dev)
1953{
47e26941
ED		 1954 const struct inet6_ifaddr *ifa;
1955 const struct inet6_dev *idev;
7df37ff3
CB		 1956 bool ret = false;
1957
1958 rcu_read_lock();
1959 idev = __in6_dev_get(dev);
1960 if (idev) {
47e26941 1961 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
7df37ff3
CB		 1962 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1963 if (ret)
1964 break;
1965 }
7df37ff3
CB		 1966 }
1967 rcu_read_unlock();
1968
1969 return ret;
1970}
1971EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1972
b71d1d42 1973int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84 1974{
24ba333b
ED		 1975 const struct inet6_ifaddr *ifa;
1976 const struct inet6_dev *idev;
52eeeb84
YH		 1977 int onlink;
1978
1979 onlink = 0;
1980 rcu_read_lock();
1981 idev = __in6_dev_get(dev);
1982 if (idev) {
24ba333b 1983 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1984 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1985 ifa->prefix_len);
1986 if (onlink)
1987 break;
1988 }
52eeeb84
YH		 1989 }
1990 rcu_read_unlock();
1991 return onlink;
1992}
52eeeb84
YH		 1993EXPORT_SYMBOL(ipv6_chk_prefix);
1994
9acd9f3a 1995struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1996 struct net_device *dev, int strict)
1da177e4 1997{
3f27fb23 1998 unsigned int hash = inet6_addr_hash(net, addr);
b79d1d54 1999 struct inet6_ifaddr *ifp, *result = NULL;
1da177e4 2000
24f226da
ED		 2001 rcu_read_lock();
2002 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 2003 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 2004 continue;
1da177e4 2005 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 2006 if (!dev || ifp->idev->dev == dev ||
1da177e4 2007 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 2008 result = ifp;
1da177e4
LT		 2009 in6_ifa_hold(ifp);
2010 break;
2011 }
2012 }
2013 }
24f226da 2014 rcu_read_unlock();
1da177e4 2015
b79d1d54 2016 return result;
1da177e4
LT		 2017}
2018
1da177e4
LT		 2019/* Gets referenced address, destroys ifaddr */
2020
cc411d0b 2021static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 2022{
3d171f39
LR		 2023 if (dad_failed)
2024 ifp->flags |= IFA_F_DADFAILED;
2025
ec8add2a 2026 if (ifp->flags&IFA_F_TEMPORARY) {
1da177e4
LT		 2027 struct inet6_ifaddr *ifpub;
2028 spin_lock_bh(&ifp->lock);
2029 ifpub = ifp->ifpub;
2030 if (ifpub) {
2031 in6_ifa_hold(ifpub);
2032 spin_unlock_bh(&ifp->lock);
fffcefe9 2033 ipv6_create_tempaddr(ifpub, ifp, true);
1da177e4
LT		 2034 in6_ifa_put(ifpub);
2035 } else {
2036 spin_unlock_bh(&ifp->lock);
2037 }
2038 ipv6_del_addr(ifp);
ec8add2a
SD		 2039 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2040 spin_lock_bh(&ifp->lock);
2041 addrconf_del_dad_work(ifp);
2042 ifp->flags |= IFA_F_TENTATIVE;
f1c02cfb
SD		 2043 if (dad_failed)
2044 ifp->flags &= ~IFA_F_OPTIMISTIC;
ec8add2a
SD		 2045 spin_unlock_bh(&ifp->lock);
2046 if (dad_failed)
2047 ipv6_ifa_notify(0, ifp);
2048 in6_ifa_put(ifp);
c15b1cca 2049 } else {
1da177e4 2050 ipv6_del_addr(ifp);
c15b1cca 2051 }
1da177e4
LT		 2052}
2053
f2344a13
HX		 2054static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2055{
2056 int err = -ENOENT;
2057
8e8e676d 2058 spin_lock_bh(&ifp->lock);
f2344a13
HX		 2059 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2060 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2061 err = 0;
2062 }
8e8e676d 2063 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 2064
2065 return err;
2066}
2067
da13c59b 2068void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
3c21edbd 2069{
1b34be74 2070 struct inet6_dev *idev = ifp->idev;
1855b7c3 2071 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 2072
853dc2e0
UB		 2073 if (addrconf_dad_end(ifp)) {
2074 in6_ifa_put(ifp);
f2344a13 2075 return;
853dc2e0 2076 }
f2344a13 2077
da13c59b
VP		 2078 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2079 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
9bdd8d40 2080
5f40ef77
HFS		 2081 spin_lock_bh(&ifp->lock);
2082
2083 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
5f40ef77
HFS		 2084 struct in6_addr new_addr;
2085 struct inet6_ifaddr *ifp2;
5f40ef77 2086 int retries = ifp->stable_privacy_retry + 1;
e6464b8c
DA		 2087 struct ifa6_config cfg = {
2088 .pfx = &new_addr,
2089 .plen = ifp->prefix_len,
2090 .ifa_flags = ifp->flags,
2091 .valid_lft = ifp->valid_lft,
2092 .preferred_lft = ifp->prefered_lft,
2093 .scope = ifp->scope,
2094 };
5f40ef77 2095
1855b7c3 2096 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 2097 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2098 ifp->idev->dev->name);
2099 goto errdad;
2100 }
2101
2102 new_addr = ifp->addr;
2103 if (ipv6_generate_stable_address(&new_addr, retries,
2104 idev))
2105 goto errdad;
2106
5f40ef77 2107 spin_unlock_bh(&ifp->lock);
1b34be74 2108
5f40ef77
HFS		 2109 if (idev->cnf.max_addresses &&
2110 ipv6_count_addresses(idev) >=
2111 idev->cnf.max_addresses)
2112 goto lock_errdad;
2113
2114 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2115 ifp->idev->dev->name);
2116
e6464b8c 2117 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
5f40ef77
HFS		 2118 if (IS_ERR(ifp2))
2119 goto lock_errdad;
2120
2121 spin_lock_bh(&ifp2->lock);
2122 ifp2->stable_privacy_retry = retries;
2123 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2124 spin_unlock_bh(&ifp2->lock);
2125
1855b7c3 2126 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 2127 in6_ifa_put(ifp2);
2128lock_errdad:
2129 spin_lock_bh(&ifp->lock);
1b34be74
YH		 2130 }
2131
5f40ef77 2132errdad:
c15b1cca
HFS		 2133 /* transition from _POSTDAD to _ERRDAD */
2134 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 2135 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 2136
2137 addrconf_mod_dad_work(ifp, 0);
751eb6b6 2138 in6_ifa_put(ifp);
3c21edbd 2139}
1da177e4 2140
a9ed4a29
SD		 2141/* Join to solicited addr multicast group.
2142 * caller must hold RTNL */
b71d1d42 2143void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 2144{
2145 struct in6_addr maddr;
2146
2147 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2148 return;
2149
2150 addrconf_addr_solict_mult(addr, &maddr);
2151 ipv6_dev_mc_inc(dev, &maddr);
2152}
2153
a9ed4a29 2154/* caller must hold RTNL */
b71d1d42 2155void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 2156{
2157 struct in6_addr maddr;
2158
2159 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2160 return;
2161
2162 addrconf_addr_solict_mult(addr, &maddr);
2163 __ipv6_dev_mc_dec(idev, &maddr);
2164}
2165
a9ed4a29 2166/* caller must hold RTNL */
20380731 2167static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2168{
2169 struct in6_addr addr;
c15b1cca 2170
88ad3149 2171 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 2172 return;
1da177e4
LT		 2173 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2174 if (ipv6_addr_any(&addr))
2175 return;
013b4d90 2176 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 2177}
2178
a9ed4a29 2179/* caller must hold RTNL */
20380731 2180static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2181{
2182 struct in6_addr addr;
c15b1cca 2183
88ad3149 2184 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 2185 return;
1da177e4
LT		 2186 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2187 if (ipv6_addr_any(&addr))
2188 return;
2189 __ipv6_dev_ac_dec(ifp->idev, &addr);
2190}
2191
8a7a4b47 2192static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
06a4c1c5 2193{
8a7a4b47
AA		 2194 switch (dev->addr_len) {
2195 case ETH_ALEN:
9dae2e03
LAD		 2196 memcpy(eui, dev->dev_addr, 3);
2197 eui[3] = 0xFF;
2198 eui[4] = 0xFE;
2199 memcpy(eui + 5, dev->dev_addr + 3, 3);
2200 break;
8a7a4b47
AA		 2201 case EUI64_ADDR_LEN:
2202 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2203 eui[0] ^= 2;
2204 break;
2205 default:
06a4c1c5 2206 return -1;
8a7a4b47
AA		 2207 }
2208
06a4c1c5 2209 return 0;
2210}
2211
cb6bf355
YH		 2212static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2213{
2214 union fwnet_hwaddr *ha;
2215
2216 if (dev->addr_len != FWNET_ALEN)
2217 return -1;
2218
2219 ha = (union fwnet_hwaddr *)dev->dev_addr;
2220
2221 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2222 eui[0] ^= 2;
2223 return 0;
2224}
2225
073a8e0e
YH		 2226static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2227{
2228 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2229 if (dev->addr_len != ARCNET_ALEN)
2230 return -1;
2231 memset(eui, 0, 7);
8e5e8f30 2232 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 2233 return 0;
2234}
2235
2236static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2237{
2238 if (dev->addr_len != INFINIBAND_ALEN)
2239 return -1;
2240 memcpy(eui, dev->dev_addr + 12, 8);
2241 eui[0] |= 2;
2242 return 0;
2243}
2244
c61393ea 2245static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2246{
9af28511
SH		 2247 if (addr == 0)
2248 return -1;
dfd982ba
YH		 2249 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2250 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2251 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2252 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2253 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2254 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2255 eui[1] = 0;
2256 eui[2] = 0x5E;
2257 eui[3] = 0xFE;
2258 memcpy(eui + 4, &addr, 4);
2259 return 0;
2260}
dfd982ba
YH		 2261
2262static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2263{
2264 if (dev->priv_flags & IFF_ISATAP)
2265 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2266 return -1;
2267}
2268
aee80b54 2269static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2270{
2271 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2272}
2273
e837735e
ND		 2274static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2275{
2276 memcpy(eui, dev->perm_addr, 3);
2277 memcpy(eui + 5, dev->perm_addr + 3, 3);
2278 eui[3] = 0xFF;
2279 eui[4] = 0xFE;
2280 eui[0] ^= 2;
2281 return 0;
2282}
2283
1da177e4
LT		 2284static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2285{
2286 switch (dev->type) {
2287 case ARPHRD_ETHER:
2288 case ARPHRD_FDDI:
073a8e0e 2289 return addrconf_ifid_eui48(eui, dev);
1da177e4 2290 case ARPHRD_ARCNET:
073a8e0e 2291 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2292 case ARPHRD_INFINIBAND:
073a8e0e 2293 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2294 case ARPHRD_SIT:
dfd982ba 2295 return addrconf_ifid_sit(eui, dev);
aee80b54 2296 case ARPHRD_IPGRE:
45ce0fd1 2297 case ARPHRD_TUNNEL:
aee80b54 2298 return addrconf_ifid_gre(eui, dev);
e74bccb8 2299 case ARPHRD_6LOWPAN:
8a7a4b47 2300 return addrconf_ifid_6lowpan(eui, dev);
cb6bf355
YH		 2301 case ARPHRD_IEEE1394:
2302 return addrconf_ifid_ieee1394(eui, dev);
e837735e 2303 case ARPHRD_TUNNEL6:
45ce0fd1 2304 case ARPHRD_IP6GRE:
9deb441c 2305 case ARPHRD_RAWIP:
e837735e 2306 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2307 }
2308 return -1;
2309}
2310
2311static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2312{
2313 int err = -1;
2314 struct inet6_ifaddr *ifp;
2315
2316 read_lock_bh(&idev->lock);
602582ca
HFS		 2317 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2318 if (ifp->scope > IFA_LINK)
2319 break;
1da177e4
LT		 2320 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2321 memcpy(eui, ifp->addr.s6_addr+8, 8);
2322 err = 0;
2323 break;
2324 }
2325 }
2326 read_unlock_bh(&idev->lock);
2327 return err;
2328}
2329
1da177e4 2330/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
9d6280da 2331static void ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2332{
1da177e4 2333regen:
955189ef 2334 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2335 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2336
2337 /*
2338 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2339 * check if generated address is not inappropriate
2340 *
2341 * - Reserved subnet anycast (RFC 2526)
2342 * 11111101 11....11 1xxxxxxx
c7dc89c0 2343 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2344 * 00-00-5E-FE-xx-xx-xx-xx
2345 * - value 0
2346 * - XXX: already assigned to an address on the device
2347 */
1ab1457c 2348 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2349 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2350 (idev->rndid[7]&0x80))
2351 goto regen;
2352 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2353 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2354 goto regen;
2355 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2356 goto regen;
2357 }
1da177e4
LT		 2358}
2359
9d6280da 2360static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2361{
1da177e4 2362 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
9d6280da 2363 ipv6_regen_rndid(idev);
1da177e4 2364}
1da177e4
LT		 2365
2366/*
2367 * Add prefix route.
2368 */
2369
2370static void
8308f3ff
DA		 2371addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2372 struct net_device *dev, unsigned long expires,
2373 u32 flags, gfp_t gfp_flags)
1da177e4 2374{
86872cb5 2375 struct fib6_config cfg = {
ca254490 2376 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
8308f3ff 2377 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
86872cb5
TG		 2378 .fc_ifindex = dev->ifindex,
2379 .fc_expires = expires,
2380 .fc_dst_len = plen,
2381 .fc_flags = RTF_UP | flags,
c346dca1 2382 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2383 .fc_protocol = RTPROT_KERNEL,
e8478e80 2384 .fc_type = RTN_UNICAST,
86872cb5 2385 };
1da177e4 2386
4e3fd7a0 2387 cfg.fc_dst = *pfx;
1da177e4
LT		 2388
2389 /* Prevent useless cloning on PtP SIT.
2390 This thing is done here expecting that the whole
2391 class of non-broadcast devices need not cloning.
2392 */
07a93626 2393#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2394 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2395 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2396#endif
1da177e4 2397
acb54e3c 2398 ip6_route_add(&cfg, gfp_flags, NULL);
1da177e4
LT		 2399}
2400
14ef37b6 2401
8d1c802b 2402static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
14ef37b6
AH		 2403 int plen,
2404 const struct net_device *dev,
2b2450ca
DA		 2405 u32 flags, u32 noflags,
2406 bool no_gw)
14ef37b6
AH		 2407{
2408 struct fib6_node *fn;
8d1c802b 2409 struct fib6_info *rt = NULL;
14ef37b6 2410 struct fib6_table *table;
ca254490 2411 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2412
ca254490 2413 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2414 if (!table)
14ef37b6
AH		 2415 return NULL;
2416
66f5d6ce 2417 rcu_read_lock();
38fbeeee 2418 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
14ef37b6
AH		 2419 if (!fn)
2420 goto out;
1f56a01f 2421
66f5d6ce 2422 for_each_fib6_node_rt_rcu(fn) {
f88d8ea6
DA		 2423 /* prefix routes only use builtin fib6_nh */
2424 if (rt->nh)
2425 continue;
2426
1cf844c7 2427 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
14ef37b6 2428 continue;
1cf844c7 2429 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2b2450ca 2430 continue;
93c2fb25 2431 if ((rt->fib6_flags & flags) != flags)
14ef37b6 2432 continue;
93c2fb25 2433 if ((rt->fib6_flags & noflags) != 0)
14ef37b6 2434 continue;
e873e4b9
WW		 2435 if (!fib6_info_hold_safe(rt))
2436 continue;
14ef37b6
AH		 2437 break;
2438 }
2439out:
66f5d6ce 2440 rcu_read_unlock();
14ef37b6
AH		 2441 return rt;
2442}
2443
2444
1da177e4
LT		 2445/* Create "default" multicast route to the interface */
2446
2447static void addrconf_add_mroute(struct net_device *dev)
2448{
86872cb5 2449 struct fib6_config cfg = {
ca254490 2450 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2451 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2452 .fc_ifindex = dev->ifindex,
2453 .fc_dst_len = 8,
2454 .fc_flags = RTF_UP,
93de9d47 2455 .fc_type = RTN_MULTICAST,
c346dca1 2456 .fc_nlinfo.nl_net = dev_net(dev),
7a986230 2457 .fc_protocol = RTPROT_KERNEL,
86872cb5
TG		 2458 };
2459
2460 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2461
e500c6d3 2462 ip6_route_add(&cfg, GFP_KERNEL, NULL);
1da177e4
LT		 2463}
2464
1da177e4
LT		 2465static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2466{
2467 struct inet6_dev *idev;
2468
2469 ASSERT_RTNL();
2470
e21e8467 2471 idev = ipv6_find_idev(dev);
db0b99f5
SD		 2472 if (IS_ERR(idev))
2473 return idev;
64e724f6
BH		 2474
2475 if (idev->cnf.disable_ipv6)
2476 return ERR_PTR(-EACCES);
1da177e4
LT		 2477
2478 /* Add default multicast route */
ba46ee4c 2479 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
4af04aba 2480 addrconf_add_mroute(dev);
1da177e4 2481
1da177e4
LT		 2482 return idev;
2483}
2484
53bd6749
JP		 2485static void manage_tempaddrs(struct inet6_dev *idev,
2486 struct inet6_ifaddr *ifp,
2487 __u32 valid_lft, __u32 prefered_lft,
2488 bool create, unsigned long now)
2489{
2490 u32 flags;
2491 struct inet6_ifaddr *ift;
2492
2493 read_lock_bh(&idev->lock);
2494 /* update all temporary addresses in the list */
2495 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2496 int age, max_valid, max_prefered;
2497
2498 if (ifp != ift->ifpub)
2499 continue;
2500
2501 /* RFC 4941 section 3.3:
2502 * If a received option will extend the lifetime of a public
2503 * address, the lifetimes of temporary addresses should
2504 * be extended, subject to the overall constraint that no
2505 * temporary addresses should ever remain "valid" or "preferred"
2506 * for a time longer than (TEMP_VALID_LIFETIME) or
2507 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2508 */
2509 age = (now - ift->cstamp) / HZ;
2510 max_valid = idev->cnf.temp_valid_lft - age;
2511 if (max_valid < 0)
2512 max_valid = 0;
2513
2514 max_prefered = idev->cnf.temp_prefered_lft -
76506a98 2515 idev->desync_factor - age;
53bd6749
JP		 2516 if (max_prefered < 0)
2517 max_prefered = 0;
2518
2519 if (valid_lft > max_valid)
2520 valid_lft = max_valid;
2521
2522 if (prefered_lft > max_prefered)
2523 prefered_lft = max_prefered;
2524
2525 spin_lock(&ift->lock);
2526 flags = ift->flags;
2527 ift->valid_lft = valid_lft;
2528 ift->prefered_lft = prefered_lft;
2529 ift->tstamp = now;
2530 if (prefered_lft > 0)
2531 ift->flags &= ~IFA_F_DEPRECATED;
2532
2533 spin_unlock(&ift->lock);
2534 if (!(flags&IFA_F_TENTATIVE))
2535 ipv6_ifa_notify(0, ift);
2536 }
2537
2538 if ((create || list_empty(&idev->tempaddr_list)) &&
2539 idev->cnf.use_tempaddr > 0) {
2540 /* When a new public address is created as described
2541 * in [ADDRCONF], also create a new temporary address.
2542 * Also create a temporary address if it's enabled but
2543 * no temporary address currently exists.
2544 */
2545 read_unlock_bh(&idev->lock);
fffcefe9 2546 ipv6_create_tempaddr(ifp, NULL, false);
53bd6749
JP		 2547 } else {
2548 read_unlock_bh(&idev->lock);
2549 }
2550}
2551
cc9da6cc
BM		 2552static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2553{
d35a00b8
FJ		 2554 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2555 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc
BM		 2556}
2557
cc84b3c6
AA		 2558int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2559 const struct prefix_info *pinfo,
2560 struct inet6_dev *in6_dev,
2561 const struct in6_addr *addr, int addr_type,
2562 u32 addr_flags, bool sllao, bool tokenized,
2563 __u32 valid_lft, u32 prefered_lft)
4f672235
AA		 2564{
2565 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2566 int create = 0, update_lft = 0;
2567
2568 if (!ifp && valid_lft) {
2569 int max_addresses = in6_dev->cnf.max_addresses;
e6464b8c
DA		 2570 struct ifa6_config cfg = {
2571 .pfx = addr,
2572 .plen = pinfo->prefix_len,
2573 .ifa_flags = addr_flags,
2574 .valid_lft = valid_lft,
2575 .preferred_lft = prefered_lft,
2576 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2577 };
4f672235
AA		 2578
2579#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 2580 if ((net->ipv6.devconf_all->optimistic_dad ||
2581 in6_dev->cnf.optimistic_dad) &&
4f672235 2582 !net->ipv6.devconf_all->forwarding && sllao)
e6464b8c 2583 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
4f672235
AA		 2584#endif
2585
2586 /* Do not allow to create too much of autoconfigured
2587 * addresses; this would be too easy way to crash kernel.
2588 */
2589 if (!max_addresses ||
2590 ipv6_count_addresses(in6_dev) < max_addresses)
e6464b8c 2591 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
4f672235
AA		 2592
2593 if (IS_ERR_OR_NULL(ifp))
2594 return -1;
2595
4f672235
AA		 2596 create = 1;
2597 spin_lock_bh(&ifp->lock);
2598 ifp->flags |= IFA_F_MANAGETEMPADDR;
2599 ifp->cstamp = jiffies;
2600 ifp->tokenized = tokenized;
2601 spin_unlock_bh(&ifp->lock);
2602 addrconf_dad_start(ifp);
2603 }
2604
2605 if (ifp) {
2606 u32 flags;
2607 unsigned long now;
2608 u32 stored_lft;
2609
2610 /* update lifetime (RFC2462 5.5.3 e) */
2611 spin_lock_bh(&ifp->lock);
2612 now = jiffies;
2613 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2614 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2615 else
2616 stored_lft = 0;
f85f94b8 2617 if (!create && stored_lft) {
4f672235
AA		 2618 const u32 minimum_lft = min_t(u32,
2619 stored_lft, MIN_VALID_LIFETIME);
2620 valid_lft = max(valid_lft, minimum_lft);
2621
2622 /* RFC4862 Section 5.5.3e:
2623 * "Note that the preferred lifetime of the
2624 * corresponding address is always reset to
2625 * the Preferred Lifetime in the received
2626 * Prefix Information option, regardless of
2627 * whether the valid lifetime is also reset or
2628 * ignored."
2629 *
2630 * So we should always update prefered_lft here.
2631 */
2632 update_lft = 1;
2633 }
2634
2635 if (update_lft) {
2636 ifp->valid_lft = valid_lft;
2637 ifp->prefered_lft = prefered_lft;
2638 ifp->tstamp = now;
2639 flags = ifp->flags;
2640 ifp->flags &= ~IFA_F_DEPRECATED;
2641 spin_unlock_bh(&ifp->lock);
2642
2643 if (!(flags&IFA_F_TENTATIVE))
2644 ipv6_ifa_notify(0, ifp);
2645 } else
2646 spin_unlock_bh(&ifp->lock);
2647
2648 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2649 create, now);
2650
2651 in6_ifa_put(ifp);
2652 addrconf_verify();
2653 }
2654
2655 return 0;
2656}
cc84b3c6 2657EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
4f672235 2658
e6bff995 2659void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2660{
2661 struct prefix_info *pinfo;
2662 __u32 valid_lft;
2663 __u32 prefered_lft;
4f672235 2664 int addr_type, err;
64236f3f 2665 u32 addr_flags = 0;
1da177e4 2666 struct inet6_dev *in6_dev;
56d417b1 2667 struct net *net = dev_net(dev);
1da177e4
LT		 2668
2669 pinfo = (struct prefix_info *) opt;
1ab1457c 2670
1da177e4 2671 if (len < sizeof(struct prefix_info)) {
e32ac250 2672 netdev_dbg(dev, "addrconf: prefix option too short\n");
1da177e4
LT		 2673 return;
2674 }
1ab1457c 2675
1da177e4
LT		 2676 /*
2677 * Validation checks ([ADDRCONF], page 19)
2678 */
2679
2680 addr_type = ipv6_addr_type(&pinfo->prefix);
2681
2682 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2683 return;
2684
2685 valid_lft = ntohl(pinfo->valid);
2686 prefered_lft = ntohl(pinfo->prefered);
2687
2688 if (prefered_lft > valid_lft) {
e87cc472 2689 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2690 return;
2691 }
2692
2693 in6_dev = in6_dev_get(dev);
2694
63159f29 2695 if (!in6_dev) {
e87cc472
JP		 2696 net_dbg_ratelimited("addrconf: device %s not configured\n",
2697 dev->name);
1da177e4
LT		 2698 return;
2699 }
2700
2701 /*
2702 * Two things going on here:
2703 * 1) Add routes for on-link prefixes
2704 * 2) Configure prefixes with the auto flag set
2705 */
2706
4bed72e4 2707 if (pinfo->onlink) {
8d1c802b 2708 struct fib6_info *rt;
4bed72e4
YH		 2709 unsigned long rt_expires;
2710
6f704992
YH		 2711 /* Avoid arithmetic overflow. Really, we could
2712 * save rt_expires in seconds, likely valid_lft,
2713 * but it would require division in fib gc, that it
2714 * not good.
2715 */
4bed72e4
YH		 2716 if (HZ > USER_HZ)
2717 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2718 else
2719 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2720
4bed72e4
YH		 2721 if (addrconf_finite_timeout(rt_expires))
2722 rt_expires *= HZ;
1da177e4 2723
14ef37b6
AH		 2724 rt = addrconf_get_prefix_route(&pinfo->prefix,
2725 pinfo->prefix_len,
2726 dev,
2727 RTF_ADDRCONF | RTF_PREFIX_RT,
2b2450ca 2728 RTF_DEFAULT, true);
1da177e4 2729
14ef37b6 2730 if (rt) {
6f704992
YH		 2731 /* Autoconf prefix route */
2732 if (valid_lft == 0) {
afb1d4b5 2733 ip6_del_rt(net, rt);
6f704992 2734 rt = NULL;
4bed72e4 2735 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2736 /* not infinity */
14895687 2737 fib6_set_expires(rt, jiffies + rt_expires);
6f704992 2738 } else {
14895687 2739 fib6_clean_expires(rt);
1da177e4
LT		 2740 }
2741 } else if (valid_lft) {
6f704992 2742 clock_t expires = 0;
4bed72e4
YH		 2743 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2744 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2745 /* not infinity */
2746 flags |= RTF_EXPIRES;
2747 expires = jiffies_to_clock_t(rt_expires);
2748 }
1da177e4 2749 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
8308f3ff
DA		 2750 0, dev, expires, flags,
2751 GFP_ATOMIC);
1da177e4 2752 }
93531c67 2753 fib6_info_release(rt);
1da177e4
LT		 2754 }
2755
2756 /* Try to figure out our local address for this prefix */
2757
2758 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1da177e4 2759 struct in6_addr addr;
f997c55c 2760 bool tokenized = false, dev_addr_generated = false;
1da177e4
LT		 2761
2762 if (pinfo->prefix_len == 64) {
2763 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2764
2765 if (!ipv6_addr_any(&in6_dev->token)) {
2766 read_lock_bh(&in6_dev->lock);
2767 memcpy(addr.s6_addr + 8,
2768 in6_dev->token.s6_addr + 8, 8);
2769 read_unlock_bh(&in6_dev->lock);
617fe29d 2770 tokenized = true;
cc9da6cc 2771 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2772 !ipv6_generate_stable_address(&addr, 0,
2773 in6_dev)) {
64236f3f 2774 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2775 goto ok;
f53adae4
DB		 2776 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2777 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
4f672235 2778 goto put;
f997c55c
AA		 2779 } else {
2780 dev_addr_generated = true;
1da177e4
LT		 2781 }
2782 goto ok;
2783 }
e87cc472
JP		 2784 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2785 pinfo->prefix_len);
4f672235 2786 goto put;
1da177e4
LT		 2787
2788ok:
4f672235
AA		 2789 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2790 &addr, addr_type,
2791 addr_flags, sllao,
2792 tokenized, valid_lft,
2793 prefered_lft);
2794 if (err)
2795 goto put;
f997c55c
AA		 2796
2797 /* Ignore error case here because previous prefix add addr was
2798 * successful which will be notified.
2799 */
2800 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2801 addr_type, addr_flags, sllao,
2802 tokenized, valid_lft,
2803 prefered_lft,
2804 dev_addr_generated);
1da177e4
LT		 2805 }
2806 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
4f672235 2807put:
1da177e4
LT		 2808 in6_dev_put(in6_dev);
2809}
2810
2811/*
2812 * Set destination address.
2813 * Special case for SIT interfaces where we create a new "virtual"
2814 * device.
2815 */
af284937 2816int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2817{
2818 struct in6_ifreq ireq;
2819 struct net_device *dev;
2820 int err = -EINVAL;
2821
2822 rtnl_lock();
2823
2824 err = -EFAULT;
2825 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2826 goto err_exit;
2827
af284937 2828 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2829
2830 err = -ENODEV;
63159f29 2831 if (!dev)
1da177e4
LT		 2832 goto err_exit;
2833
07a93626 2834#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2835 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2836 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2837 struct ifreq ifr;
1da177e4
LT		 2838 struct ip_tunnel_parm p;
2839
2840 err = -EADDRNOTAVAIL;
2841 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2842 goto err_exit;
2843
2844 memset(&p, 0, sizeof(p));
2845 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2846 p.iph.saddr = 0;
2847 p.iph.version = 4;
2848 p.iph.ihl = 5;
2849 p.iph.protocol = IPPROTO_IPV6;
2850 p.iph.ttl = 64;
d20b3109 2851 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2852
5bc3eb7e
SH		 2853 if (ops->ndo_do_ioctl) {
2854 mm_segment_t oldfs = get_fs();
2855
2856 set_fs(KERNEL_DS);
2857 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2858 set_fs(oldfs);
2859 } else
2860 err = -EOPNOTSUPP;
1da177e4
LT		 2861
2862 if (err == 0) {
2863 err = -ENOBUFS;
af284937
DL		 2864 dev = __dev_get_by_name(net, p.name);
2865 if (!dev)
1da177e4 2866 goto err_exit;
00f54e68 2867 err = dev_open(dev, NULL);
1da177e4
LT		 2868 }
2869 }
0be669bb 2870#endif
1da177e4
LT		 2871
2872err_exit:
2873 rtnl_unlock();
2874 return err;
2875}
2876
93a714d6
MC		 2877static int ipv6_mc_config(struct sock *sk, bool join,
2878 const struct in6_addr *addr, int ifindex)
2879{
2880 int ret;
2881
2882 ASSERT_RTNL();
2883
2884 lock_sock(sk);
2885 if (join)
54ff9ef3 2886 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2887 else
54ff9ef3 2888 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2889 release_sock(sk);
2890
2891 return ret;
2892}
2893
1da177e4
LT		 2894/*
2895 * Manual configuration of address on an interface
2896 */
479840ff 2897static int inet6_addr_add(struct net *net, int ifindex,
19b1518c 2898 struct ifa6_config *cfg,
de95e047 2899 struct netlink_ext_ack *extack)
1da177e4
LT		 2900{
2901 struct inet6_ifaddr *ifp;
2902 struct inet6_dev *idev;
2903 struct net_device *dev;
93a714d6
MC		 2904 unsigned long timeout;
2905 clock_t expires;
6f704992 2906 u32 flags;
1da177e4
LT		 2907
2908 ASSERT_RTNL();
1ab1457c 2909
19b1518c 2910 if (cfg->plen > 128)
24ef0da7
TG		 2911 return -EINVAL;
2912
0778769d 2913 /* check the lifetime */
19b1518c 2914 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
0778769d
NT		 2915 return -EINVAL;
2916
19b1518c 2917 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
53bd6749
JP		 2918 return -EINVAL;
2919
af284937
DL		 2920 dev = __dev_get_by_index(net, ifindex);
2921 if (!dev)
1da177e4 2922 return -ENODEV;
1ab1457c 2923
64e724f6
BH		 2924 idev = addrconf_add_dev(dev);
2925 if (IS_ERR(idev))
2926 return PTR_ERR(idev);
1da177e4 2927
19b1518c 2928 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
93a714d6 2929 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
19b1518c 2930 true, cfg->pfx, ifindex);
93a714d6
MC		 2931
2932 if (ret < 0)
2933 return ret;
2934 }
2935
19b1518c 2936 cfg->scope = ipv6_addr_scope(cfg->pfx);
1da177e4 2937
19b1518c 2938 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4bed72e4
YH		 2939 if (addrconf_finite_timeout(timeout)) {
2940 expires = jiffies_to_clock_t(timeout * HZ);
19b1518c 2941 cfg->valid_lft = timeout;
6f704992 2942 flags = RTF_EXPIRES;
4bed72e4
YH		 2943 } else {
2944 expires = 0;
2945 flags = 0;
19b1518c 2946 cfg->ifa_flags |= IFA_F_PERMANENT;
6f704992 2947 }
0778769d 2948
19b1518c 2949 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4bed72e4
YH		 2950 if (addrconf_finite_timeout(timeout)) {
2951 if (timeout == 0)
19b1518c
DA		 2952 cfg->ifa_flags |= IFA_F_DEPRECATED;
2953 cfg->preferred_lft = timeout;
4bed72e4 2954 }
0778769d 2955
19b1518c 2956 ifp = ipv6_add_addr(idev, cfg, true, extack);
1da177e4 2957 if (!IS_ERR(ifp)) {
19b1518c 2958 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
8308f3ff
DA		 2959 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2960 ifp->rt_priority, dev, expires,
2961 flags, GFP_KERNEL);
761aac73
TH		 2962 }
2963
a2d481b3
LB		 2964 /* Send a netlink notification if DAD is enabled and
2965 * optimistic flag is not set
2966 */
2967 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2968 ipv6_ifa_notify(0, ifp);
95c385b4
NH		 2969 /*
2970 * Note that section 3.1 of RFC 4429 indicates
2971 * that the Optimistic flag should not be set for
2972 * manually configured addresses
2973 */
cf22f9a2 2974 addrconf_dad_start(ifp);
19b1518c
DA		 2975 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2976 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2977 cfg->preferred_lft, true, jiffies);
1da177e4 2978 in6_ifa_put(ifp);
c15b1cca 2979 addrconf_verify_rtnl();
1da177e4 2980 return 0;
19b1518c
DA		 2981 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2982 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
2983 cfg->pfx, ifindex);
1da177e4
LT		 2984 }
2985
2986 return PTR_ERR(ifp);
2987}
2988
6046d5b4
HK		 2989static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2990 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2991{
2992 struct inet6_ifaddr *ifp;
2993 struct inet6_dev *idev;
2994 struct net_device *dev;
1ab1457c 2995
24ef0da7
TG		 2996 if (plen > 128)
2997 return -EINVAL;
2998
af284937
DL		 2999 dev = __dev_get_by_index(net, ifindex);
3000 if (!dev)
1da177e4
LT		 3001 return -ENODEV;
3002
e5d08d71 3003 idev = __in6_dev_get(dev);
63159f29 3004 if (!idev)
1da177e4
LT		 3005 return -ENXIO;
3006
3007 read_lock_bh(&idev->lock);
502a2ffd 3008 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 3009 if (ifp->prefix_len == plen &&
3010 ipv6_addr_equal(pfx, &ifp->addr)) {
3011 in6_ifa_hold(ifp);
3012 read_unlock_bh(&idev->lock);
1ab1457c 3013
6046d5b4
HK		 3014 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3015 (ifa_flags & IFA_F_MANAGETEMPADDR))
3016 manage_tempaddrs(idev, ifp, 0, 0, false,
3017 jiffies);
1da177e4 3018 ipv6_del_addr(ifp);
6046d5b4 3019 addrconf_verify_rtnl();
93a714d6
MC		 3020 if (ipv6_addr_is_multicast(pfx)) {
3021 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3022 false, pfx, dev->ifindex);
3023 }
1da177e4
LT		 3024 return 0;
3025 }
3026 }
3027 read_unlock_bh(&idev->lock);
3028 return -EADDRNOTAVAIL;
3029}
3030
3031
af284937 3032int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4 3033{
19b1518c
DA		 3034 struct ifa6_config cfg = {
3035 .ifa_flags = IFA_F_PERMANENT,
3036 .preferred_lft = INFINITY_LIFE_TIME,
3037 .valid_lft = INFINITY_LIFE_TIME,
3038 };
1da177e4
LT		 3039 struct in6_ifreq ireq;
3040 int err;
1ab1457c 3041
af31f412 3042 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 3043 return -EPERM;
1ab1457c 3044
1da177e4
LT		 3045 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3046 return -EFAULT;
3047
19b1518c
DA		 3048 cfg.pfx = &ireq.ifr6_addr;
3049 cfg.plen = ireq.ifr6_prefixlen;
3050
1da177e4 3051 rtnl_lock();
19b1518c 3052 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
1da177e4
LT		 3053 rtnl_unlock();
3054 return err;
3055}
3056
af284937 3057int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 3058{
3059 struct in6_ifreq ireq;
3060 int err;
1ab1457c 3061
af31f412 3062 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 3063 return -EPERM;
3064
3065 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3066 return -EFAULT;
3067
3068 rtnl_lock();
6046d5b4 3069 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 3070 ireq.ifr6_prefixlen);
1da177e4
LT		 3071 rtnl_unlock();
3072 return err;
3073}
3074
b5f348e5
IJ		 3075static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3076 int plen, int scope)
3077{
3078 struct inet6_ifaddr *ifp;
e6464b8c
DA		 3079 struct ifa6_config cfg = {
3080 .pfx = addr,
3081 .plen = plen,
3082 .ifa_flags = IFA_F_PERMANENT,
3083 .valid_lft = INFINITY_LIFE_TIME,
3084 .preferred_lft = INFINITY_LIFE_TIME,
3085 .scope = scope
3086 };
b5f348e5 3087
e6464b8c 3088 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
b5f348e5
IJ		 3089 if (!IS_ERR(ifp)) {
3090 spin_lock_bh(&ifp->lock);
3091 ifp->flags &= ~IFA_F_TENTATIVE;
3092 spin_unlock_bh(&ifp->lock);
764d3be6 3093 rt_genid_bump_ipv6(dev_net(idev->dev));
b5f348e5
IJ		 3094 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3095 in6_ifa_put(ifp);
3096 }
3097}
3098
07a93626 3099#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3100static void sit_add_v4_addrs(struct inet6_dev *idev)
3101{
1da177e4
LT		 3102 struct in6_addr addr;
3103 struct net_device *dev;
c346dca1 3104 struct net *net = dev_net(idev->dev);
929c9cf3 3105 int scope, plen;
f0e2acfa 3106 u32 pflags = 0;
1da177e4
LT		 3107
3108 ASSERT_RTNL();
3109
3110 memset(&addr, 0, sizeof(struct in6_addr));
3111 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3112
3113 if (idev->dev->flags&IFF_POINTOPOINT) {
e374d89c
SS		 3114 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE)
3115 return;
3116
1da177e4
LT		 3117 addr.s6_addr32[0] = htonl(0xfe800000);
3118 scope = IFA_LINK;
929c9cf3 3119 plen = 64;
1da177e4
LT		 3120 } else {
3121 scope = IPV6_ADDR_COMPATv4;
929c9cf3 3122 plen = 96;
f0e2acfa 3123 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 3124 }
3125
3126 if (addr.s6_addr32[3]) {
929c9cf3 3127 add_addr(idev, &addr, plen, scope);
8308f3ff 3128 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
e500c6d3 3129 GFP_KERNEL);
1da177e4
LT		 3130 return;
3131 }
3132
6fda7350 3133 for_each_netdev(net, dev) {
8e5e8f30 3134 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 3135 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 3136 struct in_ifaddr *ifa;
1da177e4
LT		 3137 int flag = scope;
3138
cd5a411d 3139 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1da177e4
LT		 3140 addr.s6_addr32[3] = ifa->ifa_local;
3141
3142 if (ifa->ifa_scope == RT_SCOPE_LINK)
3143 continue;
3144 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3145 if (idev->dev->flags&IFF_POINTOPOINT)
3146 continue;
3147 flag |= IFA_HOST;
3148 }
1da177e4 3149
b5f348e5 3150 add_addr(idev, &addr, plen, flag);
8308f3ff 3151 addrconf_prefix_route(&addr, plen, 0, idev->dev,
e500c6d3 3152 0, pflags, GFP_KERNEL);
1da177e4
LT		 3153 }
3154 }
1ab1457c 3155 }
1da177e4 3156}
0be669bb 3157#endif
1da177e4
LT		 3158
3159static void init_loopback(struct net_device *dev)
3160{
3161 struct inet6_dev *idev;
1da177e4
LT		 3162
3163 /* ::1 */
3164
3165 ASSERT_RTNL();
3166
e5d08d71 3167 idev = ipv6_find_idev(dev);
db0b99f5 3168 if (IS_ERR(idev)) {
91df42be 3169 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3170 return;
3171 }
3172
b5f348e5 3173 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 3174}
3175
2ad3ed59
AA		 3176void addrconf_add_linklocal(struct inet6_dev *idev,
3177 const struct in6_addr *addr, u32 flags)
1da177e4 3178{
e6464b8c
DA		 3179 struct ifa6_config cfg = {
3180 .pfx = addr,
3181 .plen = 64,
3182 .ifa_flags = flags | IFA_F_PERMANENT,
3183 .valid_lft = INFINITY_LIFE_TIME,
3184 .preferred_lft = INFINITY_LIFE_TIME,
3185 .scope = IFA_LINK
3186 };
8e5e8f30 3187 struct inet6_ifaddr *ifp;
95c385b4
NH		 3188
3189#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 3190 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3191 idev->cnf.optimistic_dad) &&
702beb87 3192 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
e6464b8c 3193 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
95c385b4 3194#endif
1da177e4 3195
e6464b8c 3196 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
1da177e4 3197 if (!IS_ERR(ifp)) {
8308f3ff 3198 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
acb54e3c 3199 0, 0, GFP_ATOMIC);
cf22f9a2 3200 addrconf_dad_start(ifp);
1da177e4
LT		 3201 in6_ifa_put(ifp);
3202 }
3203}
2ad3ed59 3204EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
1da177e4 3205
622c81d5
HFS		 3206static bool ipv6_reserved_interfaceid(struct in6_addr address)
3207{
3208 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3209 return true;
3210
3211 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3212 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3213 return true;
3214
3215 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3216 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3217 return true;
3218
3219 return false;
3220}
3221
3222static int ipv6_generate_stable_address(struct in6_addr *address,
3223 u8 dad_count,
3224 const struct inet6_dev *idev)
3225{
622c81d5
HFS		 3226 static DEFINE_SPINLOCK(lock);
3227 static __u32 digest[SHA_DIGEST_WORDS];
3228 static __u32 workspace[SHA_WORKSPACE_WORDS];
3229
3230 static union {
3231 char __data[SHA_MESSAGE_BYTES];
3232 struct {
3233 struct in6_addr secret;
ff40217e 3234 __be32 prefix[2];
622c81d5
HFS		 3235 unsigned char hwaddr[MAX_ADDR_LEN];
3236 u8 dad_count;
3237 } __packed;
3238 } data;
3239
3240 struct in6_addr secret;
3241 struct in6_addr temp;
3242 struct net *net = dev_net(idev->dev);
3243
3244 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3245
3246 if (idev->cnf.stable_secret.initialized)
3247 secret = idev->cnf.stable_secret.secret;
3248 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3249 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3250 else
3251 return -1;
3252
3253retry:
3254 spin_lock_bh(&lock);
3255
3256 sha_init(digest);
3257 memset(&data, 0, sizeof(data));
3258 memset(workspace, 0, sizeof(workspace));
3259 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3260 data.prefix[0] = address->s6_addr32[0];
3261 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3262 data.secret = secret;
3263 data.dad_count = dad_count;
3264
3265 sha_transform(digest, data.__data, workspace);
3266
3267 temp = *address;
ff40217e
HFS		 3268 temp.s6_addr32[2] = (__force __be32)digest[0];
3269 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3270
3271 spin_unlock_bh(&lock);
3272
3273 if (ipv6_reserved_interfaceid(temp)) {
3274 dad_count++;
1855b7c3 3275 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3276 return -1;
3277 goto retry;
3278 }
3279
3280 *address = temp;
3281 return 0;
3282}
3283
cc9da6cc
BM		 3284static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3285{
3286 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3287
3288 if (s->initialized)
3289 return;
3290 s = &idev->cnf.stable_secret;
3291 get_random_bytes(&s->secret, sizeof(s->secret));
3292 s->initialized = true;
3293}
3294
bc91b0f0
JP		 3295static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3296{
622c81d5
HFS		 3297 struct in6_addr addr;
3298
ca254490
DA		 3299 /* no link local addresses on L3 master devices */
3300 if (netif_is_l3_master(idev->dev))
3301 return;
3302
4f3f9c40
JW		 3303 /* no link local addresses on devices flagged as slaves */
3304 if (idev->dev->flags & IFF_SLAVE)
3305 return;
3306
622c81d5 3307 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3308
d35a00b8 3309 switch (idev->cnf.addr_gen_mode) {
cc9da6cc
BM		 3310 case IN6_ADDR_GEN_MODE_RANDOM:
3311 ipv6_gen_mode_random_init(idev);
3312 /* fallthrough */
3313 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3314 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3315 addrconf_add_linklocal(idev, &addr,
3316 IFA_F_STABLE_PRIVACY);
622c81d5 3317 else if (prefix_route)
8308f3ff 3318 addrconf_prefix_route(&addr, 64, 0, idev->dev,
acb54e3c 3319 0, 0, GFP_KERNEL);
cc9da6cc
BM		 3320 break;
3321 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3322 /* addrconf_add_linklocal also adds a prefix_route and we
3323 * only need to care about prefix routes if ipv6_generate_eui64
3324 * couldn't generate one.
3325 */
3326 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3327 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0 3328 else if (prefix_route)
8308f3ff 3329 addrconf_prefix_route(&addr, 64, 0, idev->dev,
27b10608 3330 0, 0, GFP_KERNEL);
cc9da6cc
BM		 3331 break;
3332 case IN6_ADDR_GEN_MODE_NONE:
3333 default:
3334 /* will not add any link local address */
3335 break;
bc91b0f0
JP		 3336 }
3337}
3338
1da177e4
LT		 3339static void addrconf_dev_config(struct net_device *dev)
3340{
8e5e8f30 3341 struct inet6_dev *idev;
1da177e4
LT		 3342
3343 ASSERT_RTNL();
3344
74235a25
HX		 3345 if ((dev->type != ARPHRD_ETHER) &&
3346 (dev->type != ARPHRD_FDDI) &&
74235a25 3347 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3348 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3349 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3350 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc 3351 (dev->type != ARPHRD_6LOWPAN) &&
45ce0fd1
FJ		 3352 (dev->type != ARPHRD_IP6GRE) &&
3353 (dev->type != ARPHRD_IPGRE) &&
3354 (dev->type != ARPHRD_TUNNEL) &&
9deb441c
SAK		 3355 (dev->type != ARPHRD_NONE) &&
3356 (dev->type != ARPHRD_RAWIP)) {
74235a25 3357 /* Alas, we support only Ethernet autoconfiguration. */
33840aaf
HL		 3358 idev = __in6_dev_get(dev);
3359 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3360 dev->flags & IFF_MULTICAST)
3361 ipv6_mc_up(idev);
74235a25
HX		 3362 return;
3363 }
3364
1da177e4 3365 idev = addrconf_add_dev(dev);
64e724f6 3366 if (IS_ERR(idev))
1da177e4
LT		 3367 return;
3368
cc9da6cc
BM		 3369 /* this device type has no EUI support */
3370 if (dev->type == ARPHRD_NONE &&
d35a00b8
FJ		 3371 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3372 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc 3373
bc91b0f0 3374 addrconf_addr_gen(idev, false);
1da177e4
LT		 3375}
3376
07a93626 3377#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3378static void addrconf_sit_config(struct net_device *dev)
3379{
3380 struct inet6_dev *idev;
3381
3382 ASSERT_RTNL();
3383
1ab1457c
YH		 3384 /*
3385 * Configure the tunnel with one of our IPv4
3386 * addresses... we should configure all of
1da177e4
LT		 3387 * our v4 addrs in the tunnel
3388 */
3389
e5d08d71 3390 idev = ipv6_find_idev(dev);
db0b99f5 3391 if (IS_ERR(idev)) {
91df42be 3392 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3393 return;
3394 }
3395
c7dc89c0 3396 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3397 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3398 return;
3399 }
3400
1da177e4
LT		 3401 sit_add_v4_addrs(idev);
3402
62b54dd9 3403 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3404 addrconf_add_mroute(dev);
1da177e4 3405}
0be669bb 3406#endif
1da177e4 3407
07a93626 3408#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3409static void addrconf_gre_config(struct net_device *dev)
3410{
3411 struct inet6_dev *idev;
aee80b54 3412
aee80b54 3413 ASSERT_RTNL();
3414
e5d08d71 3415 idev = ipv6_find_idev(dev);
db0b99f5 3416 if (IS_ERR(idev)) {
91df42be 3417 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3418 return;
3419 }
3420
bc91b0f0 3421 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3422 if (dev->flags & IFF_POINTOPOINT)
3423 addrconf_add_mroute(dev);
aee80b54 3424}
3425#endif
3426
afb1d4b5
DA		 3427static int fixup_permanent_addr(struct net *net,
3428 struct inet6_dev *idev,
f1705ec1
DA		 3429 struct inet6_ifaddr *ifp)
3430{
93c2fb25 3431 /* !fib6_node means the host route was removed from the
8048ced9
DA		 3432 * FIB, for example, if 'lo' device is taken down. In that
3433 * case regenerate the host route.
3434 */
93c2fb25 3435 if (!ifp->rt || !ifp->rt->fib6_node) {
360a9887 3436 struct fib6_info *f6i, *prev;
f1705ec1 3437
360a9887
DA		 3438 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3439 GFP_ATOMIC);
3440 if (IS_ERR(f6i))
3441 return PTR_ERR(f6i);
f1705ec1 3442
8048ced9
DA		 3443 /* ifp->rt can be accessed outside of rtnl */
3444 spin_lock(&ifp->lock);
3445 prev = ifp->rt;
360a9887 3446 ifp->rt = f6i;
8048ced9
DA		 3447 spin_unlock(&ifp->lock);
3448
93531c67 3449 fib6_info_release(prev);
f1705ec1
DA		 3450 }
3451
3452 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3453 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
8308f3ff
DA		 3454 ifp->rt_priority, idev->dev, 0, 0,
3455 GFP_ATOMIC);
f1705ec1
DA		 3456 }
3457
6d717134
DA		 3458 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3459 addrconf_dad_start(ifp);
f1705ec1
DA		 3460
3461 return 0;
3462}
3463
afb1d4b5 3464static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
f1705ec1
DA		 3465{
3466 struct inet6_ifaddr *ifp, *tmp;
3467 struct inet6_dev *idev;
3468
3469 idev = __in6_dev_get(dev);
3470 if (!idev)
3471 return;
3472
3473 write_lock_bh(&idev->lock);
3474
3475 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3476 if ((ifp->flags & IFA_F_PERMANENT) &&
afb1d4b5 3477 fixup_permanent_addr(net, idev, ifp) < 0) {
f1705ec1 3478 write_unlock_bh(&idev->lock);
e669b869 3479 in6_ifa_hold(ifp);
f1705ec1
DA		 3480 ipv6_del_addr(ifp);
3481 write_lock_bh(&idev->lock);
3482
3483 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3484 idev->dev->name, &ifp->addr);
3485 }
3486 }
3487
3488 write_unlock_bh(&idev->lock);
3489}
3490
1ab1457c 3491static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3492 void *ptr)
1da177e4 3493{
351638e7 3494 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
896585d4 3495 struct netdev_notifier_change_info *change_info;
4f7f34ea 3496 struct netdev_notifier_changeupper_info *info;
748e2d93 3497 struct inet6_dev *idev = __in6_dev_get(dev);
60abc0be 3498 struct net *net = dev_net(dev);
c5e33bdd 3499 int run_pending = 0;
b217d616 3500 int err;
1da177e4 3501
e21e8467 3502 switch (event) {
45ba9dd2 3503 case NETDEV_REGISTER:
74235a25 3504 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3505 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3506 if (IS_ERR(idev))
3507 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3508 }
3509 break;
bcdd553f 3510
b7b0b1d2
AD		 3511 case NETDEV_CHANGEMTU:
3512 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3513 if (dev->mtu < IPV6_MIN_MTU) {
60abc0be 3514 addrconf_ifdown(dev, dev != net->loopback_dev);
b7b0b1d2
AD		 3515 break;
3516 }
3517
3518 if (idev) {
3519 rt6_mtu_change(dev, dev->mtu);
3520 idev->cnf.mtu6 = dev->mtu;
3521 break;
3522 }
3523
3524 /* allocate new idev */
3525 idev = ipv6_add_dev(dev);
3526 if (IS_ERR(idev))
3527 break;
3528
3529 /* device is still not ready */
3530 if (!(idev->if_flags & IF_READY))
3531 break;
3532
3533 run_pending = 1;
3534
3535 /* fall through */
3536
1da177e4 3537 case NETDEV_UP:
3c21edbd 3538 case NETDEV_CHANGE:
c2edacf8
JV		 3539 if (dev->flags & IFF_SLAVE)
3540 break;
3541
3ce62a84
WC		 3542 if (idev && idev->cnf.disable_ipv6)
3543 break;
3544
3c21edbd 3545 if (event == NETDEV_UP) {
38bd10c4 3546 /* restore routes for permanent addresses */
afb1d4b5 3547 addrconf_permanent_addr(net, dev);
38bd10c4 3548
1f372c7b 3549 if (!addrconf_link_ready(dev)) {
3c21edbd 3550 /* device is not ready yet. */
7c62b8dd
LR		 3551 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3552 dev->name);
3c21edbd
YH		 3553 break;
3554 }
99081049 3555
d31c7b8f
EP		 3556 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3557 idev = ipv6_add_dev(dev);
3558
a317a2f1 3559 if (!IS_ERR_OR_NULL(idev)) {
99081049 3560 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3561 run_pending = 1;
3562 }
b7b0b1d2 3563 } else if (event == NETDEV_CHANGE) {
1f372c7b 3564 if (!addrconf_link_ready(dev)) {
3c21edbd 3565 /* device is still not ready. */
27c6fa73 3566 rt6_sync_down_dev(dev, event);
3c21edbd
YH		 3567 break;
3568 }
3569
896585d4 3570 if (!IS_ERR_OR_NULL(idev)) {
a088d1d7
LL		 3571 if (idev->if_flags & IF_READY) {
3572 /* device is already configured -
3573 * but resend MLD reports, we might
3574 * have roamed and need to update
3575 * multicast snooping switches
3576 */
3577 ipv6_mc_up(idev);
896585d4
HL		 3578 change_info = ptr;
3579 if (change_info->flags_changed & IFF_NOARP)
3580 addrconf_dad_run(idev, true);
27c6fa73 3581 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3c21edbd 3582 break;
a088d1d7 3583 }
3c21edbd
YH		 3584 idev->if_flags |= IF_READY;
3585 }
3586
f3213831
JP		 3587 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3588 dev->name);
3c21edbd 3589
c5e33bdd 3590 run_pending = 1;
3c21edbd
YH		 3591 }
3592
e21e8467 3593 switch (dev->type) {
07a93626 3594#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3595 case ARPHRD_SIT:
3596 addrconf_sit_config(dev);
3597 break;
aee80b54 3598#endif
07a93626 3599#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3600 case ARPHRD_IPGRE:
3601 addrconf_gre_config(dev);
3602 break;
0be669bb 3603#endif
1da177e4
LT		 3604 case ARPHRD_LOOPBACK:
3605 init_loopback(dev);
3606 break;
3607
3608 default:
3609 addrconf_dev_config(dev);
3610 break;
3ff50b79 3611 }
bcdd553f 3612
a317a2f1 3613 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd 3614 if (run_pending)
896585d4 3615 addrconf_dad_run(idev, false);
c5e33bdd 3616
2127d95a
IS		 3617 /* Device has an address by now */
3618 rt6_sync_up(dev, RTNH_F_DEAD);
3619
bcdd553f
SH		 3620 /*
3621 * If the MTU changed during the interface down,
3622 * when the interface up, the changed MTU must be
3623 * reflected in the idev as well as routers.
1da177e4 3624 */
bcdd553f
SH		 3625 if (idev->cnf.mtu6 != dev->mtu &&
3626 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3627 rt6_mtu_change(dev, dev->mtu);
3628 idev->cnf.mtu6 = dev->mtu;
3629 }
3630 idev->tstamp = jiffies;
3631 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3632
3633 /*
3634 * If the changed mtu during down is lower than
3635 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3636 */
3637 if (dev->mtu < IPV6_MIN_MTU)
60abc0be 3638 addrconf_ifdown(dev, dev != net->loopback_dev);
1da177e4
LT		 3639 }
3640 break;
3641
1da177e4
LT		 3642 case NETDEV_DOWN:
3643 case NETDEV_UNREGISTER:
3644 /*
3645 * Remove all addresses from this interface.
3646 */
3647 addrconf_ifdown(dev, event != NETDEV_DOWN);
3648 break;
3c21edbd 3649
1da177e4 3650 case NETDEV_CHANGENAME:
1da177e4 3651 if (idev) {
5632c515 3652 snmp6_unregister_dev(idev);
408c4768 3653 addrconf_sysctl_unregister(idev);
a317a2f1 3654 err = addrconf_sysctl_register(idev);
b217d616
HX		 3655 if (err)
3656 return notifier_from_errno(err);
a317a2f1
WC		 3657 err = snmp6_register_dev(idev);
3658 if (err) {
3659 addrconf_sysctl_unregister(idev);
3660 return notifier_from_errno(err);
3661 }
5632c515 3662 }
1da177e4 3663 break;
bcdd553f 3664
93d9b7d7
JP		 3665 case NETDEV_PRE_TYPE_CHANGE:
3666 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3667 if (idev)
3668 addrconf_type_change(dev, event);
75c78500 3669 break;
4f7f34ea
DA		 3670
3671 case NETDEV_CHANGEUPPER:
3672 info = ptr;
3673
3674 /* flush all routes if dev is linked to or unlinked from
3675 * an L3 master device (e.g., VRF)
3676 */
3677 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3678 addrconf_ifdown(dev, 0);
3ff50b79 3679 }
1da177e4
LT		 3680
3681 return NOTIFY_OK;
3682}
3683
3684/*
3685 * addrconf module should be notified of a device going up
3686 */
3687static struct notifier_block ipv6_dev_notf = {
3688 .notifier_call = addrconf_notify,
242d3a49 3689 .priority = ADDRCONF_NOTIFY_PRIORITY,
1da177e4
LT		 3690};
3691
93d9b7d7 3692static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3693{
3694 struct inet6_dev *idev;
3695 ASSERT_RTNL();
3696
3697 idev = __in6_dev_get(dev);
3698
93d9b7d7 3699 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3700 ipv6_mc_remap(idev);
93d9b7d7 3701 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3702 ipv6_mc_unmap(idev);
3703}
3704
70af921d
DA		 3705static bool addr_is_local(const struct in6_addr *addr)
3706{
3707 return ipv6_addr_type(addr) &
3708 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3709}
3710
1da177e4
LT		 3711static int addrconf_ifdown(struct net_device *dev, int how)
3712{
4c981e28 3713 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN;
c346dca1 3714 struct net *net = dev_net(dev);
502a2ffd 3715 struct inet6_dev *idev;
f1705ec1 3716 struct inet6_ifaddr *ifa, *tmp;
0aef78aa 3717 bool keep_addr = false;
73a8bd74 3718 int state, i;
1da177e4
LT		 3719
3720 ASSERT_RTNL();
3721
4c981e28 3722 rt6_disable_ip(dev, event);
1da177e4
LT		 3723
3724 idev = __in6_dev_get(dev);
63159f29 3725 if (!idev)
1da177e4
LT		 3726 return -ENODEV;
3727
bcdd553f
SH		 3728 /*
3729 * Step 1: remove reference to ipv6 device from parent device.
3730 * Do not dev_put!
1da177e4 3731 */
439e2385 3732 if (how) {
1da177e4 3733 idev->dead = 1;
8814c4b5
YH		 3734
3735 /* protected by rtnl_lock */
a9b3cd7f 3736 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3737
3738 /* Step 1.5: remove snmp6 entry */
3739 snmp6_unregister_dev(idev);
3740
3741 }
3742
f1705ec1
DA		 3743 /* combine the user config with event to determine if permanent
3744 * addresses are to be removed from address hash table
3745 */
0aef78aa
IV		 3746 if (!how && !idev->cnf.disable_ipv6) {
3747 /* aggregate the system setting and interface setting */
3748 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3749
3750 if (!_keep_addr)
3751 _keep_addr = idev->cnf.keep_addr_on_down;
3752
3753 keep_addr = (_keep_addr > 0);
3754 }
f1705ec1 3755
73a8bd74
DM		 3756 /* Step 2: clear hash table */
3757 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3758 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3759
3760 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3761restart:
b67bfe0d 3762 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3763 if (ifa->idev == idev) {
c15b1cca 3764 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3765 /* combined flag + permanent flag decide if
3766 * address is retained on a down event
3767 */
3768 if (!keep_addr ||
70af921d
DA		 3769 !(ifa->flags & IFA_F_PERMANENT) ||
3770 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3771 hlist_del_init_rcu(&ifa->addr_lst);
3772 goto restart;
3773 }
73a8bd74
DM		 3774 }
3775 }
3776 spin_unlock_bh(&addrconf_hash_lock);
3777 }
3778
1da177e4
LT		 3779 write_lock_bh(&idev->lock);
3780
b7b1bfce
HFS		 3781 addrconf_del_rs_timer(idev);
3782
bcdd553f 3783 /* Step 2: clear flags for stateless addrconf */
439e2385 3784 if (!how)
3c21edbd 3785 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3786
bcdd553f 3787 /* Step 3: clear tempaddr list */
372e6c8f 3788 while (!list_empty(&idev->tempaddr_list)) {
3789 ifa = list_first_entry(&idev->tempaddr_list,
3790 struct inet6_ifaddr, tmp_list);
3791 list_del(&ifa->tmp_list);
1da177e4
LT		 3792 write_unlock_bh(&idev->lock);
3793 spin_lock_bh(&ifa->lock);
3794
3795 if (ifa->ifpub) {
3796 in6_ifa_put(ifa->ifpub);
3797 ifa->ifpub = NULL;
3798 }
3799 spin_unlock_bh(&ifa->lock);
3800 in6_ifa_put(ifa);
3801 write_lock_bh(&idev->lock);
3802 }
8f37ada5 3803
f1705ec1 3804 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
8d1c802b 3805 struct fib6_info *rt = NULL;
a2d6cbb0 3806 bool keep;
38bd10c4 3807
f1705ec1 3808 addrconf_del_dad_work(ifa);
84e8b803 3809
a2d6cbb0
RV		 3810 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3811 !addr_is_local(&ifa->addr);
a2d6cbb0 3812
73a8bd74 3813 write_unlock_bh(&idev->lock);
8e8e676d 3814 spin_lock_bh(&ifa->lock);
f1705ec1 3815
a2d6cbb0 3816 if (keep) {
f1705ec1
DA		 3817 /* set state to skip the notifier below */
3818 state = INET6_IFADDR_STATE_DEAD;
6d717134 3819 ifa->state = INET6_IFADDR_STATE_PREDAD;
f1705ec1
DA		 3820 if (!(ifa->flags & IFA_F_NODAD))
3821 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3822
3823 rt = ifa->rt;
3824 ifa->rt = NULL;
f1705ec1
DA		 3825 } else {
3826 state = ifa->state;
3827 ifa->state = INET6_IFADDR_STATE_DEAD;
f1705ec1
DA		 3828 }
3829
8e8e676d 3830 spin_unlock_bh(&ifa->lock);
9d82ca98 3831
38bd10c4 3832 if (rt)
afb1d4b5 3833 ip6_del_rt(net, rt);
38bd10c4 3834
73a8bd74
DM		 3835 if (state != INET6_IFADDR_STATE_DEAD) {
3836 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3837 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
ea06f717
MM		 3838 } else {
3839 if (idev->cnf.forwarding)
3840 addrconf_leave_anycast(ifa);
3841 addrconf_leave_solict(ifa->idev, &ifa->addr);
27bdb2ab 3842 }
8f37ada5 3843
73a8bd74 3844 write_lock_bh(&idev->lock);
8ef802aa
ED		 3845 if (!keep) {
3846 list_del_rcu(&ifa->if_list);
3847 in6_ifa_put(ifa);
3848 }
73a8bd74 3849 }
8f37ada5 3850
1da177e4
LT		 3851 write_unlock_bh(&idev->lock);
3852
381f4dca
SD		 3853 /* Step 5: Discard anycast and multicast list */
3854 if (how) {
3855 ipv6_ac_destroy_dev(idev);
1da177e4 3856 ipv6_mc_destroy_dev(idev);
381f4dca 3857 } else {
1da177e4 3858 ipv6_mc_down(idev);
381f4dca 3859 }
1da177e4 3860
1da177e4 3861 idev->tstamp = jiffies;
1ab1457c 3862
bcdd553f 3863 /* Last: Shot the device (if unregistered) */
439e2385 3864 if (how) {
408c4768 3865 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3866 neigh_parms_release(&nd_tbl, idev->nd_parms);
3867 neigh_ifdown(&nd_tbl, dev);
3868 in6_dev_put(idev);
3869 }
3870 return 0;
3871}
3872
e99e88a9 3873static void addrconf_rs_timer(struct timer_list *t)
1da177e4 3874{
e99e88a9 3875 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
caf92bc4 3876 struct net_device *dev = idev->dev;
b7b1bfce 3877 struct in6_addr lladdr;
1da177e4 3878
b7b1bfce 3879 write_lock(&idev->lock);
5b2a1953 3880 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3881 goto out;
3882
9ba2add3 3883 if (!ipv6_accept_ra(idev))
5b2a1953 3884 goto out;
3885
3886 /* Announcement received after solicitation was sent */
3887 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3888 goto out;
1da177e4 3889
bd11f074 3890 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
caf92bc4
CW		 3891 write_unlock(&idev->lock);
3892 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3893 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3894 &in6addr_linklocal_allrouters);
3895 else
caf92bc4 3896 goto put;
1da177e4 3897
caf92bc4 3898 write_lock(&idev->lock);
bd11f074
MŻ		 3899 idev->rs_interval = rfc3315_s14_backoff_update(
3900 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
b7b1bfce
HFS		 3901 /* The wait after the last probe can be shorter */
3902 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3903 idev->cnf.rtr_solicits) ?
3904 idev->cnf.rtr_solicit_delay :
bd11f074 3905 idev->rs_interval);
1da177e4 3906 } else {
1da177e4
LT		 3907 /*
3908 * Note: we do not support deprecated "all on-link"
3909 * assumption any longer.
3910 */
91df42be 3911 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3912 }
3913
3914out:
b7b1bfce 3915 write_unlock(&idev->lock);
caf92bc4 3916put:
b7b1bfce 3917 in6_dev_put(idev);
1da177e4
LT		 3918}
3919
3920/*
3921 * Duplicate Address Detection
3922 */
3c21edbd
YH		 3923static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3924{
3925 unsigned long rand_num;
3926 struct inet6_dev *idev = ifp->idev;
adc176c5 3927 u64 nonce;
3c21edbd 3928
95c385b4
NH		 3929 if (ifp->flags & IFA_F_OPTIMISTIC)
3930 rand_num = 0;
3931 else
63862b5b 3932 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3933
adc176c5
EN		 3934 nonce = 0;
3935 if (idev->cnf.enhanced_dad ||
3936 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3937 do
3938 get_random_bytes(&nonce, 6);
3939 while (nonce == 0);
3940 }
3941 ifp->dad_nonce = nonce;
b7b1bfce 3942 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3943 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3944}
3945
c15b1cca 3946static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3947{
3948 struct inet6_dev *idev = ifp->idev;
3949 struct net_device *dev = idev->dev;
764d3be6 3950 bool bump_id, notify = false;
afb1d4b5 3951 struct net *net;
1da177e4
LT		 3952
3953 addrconf_join_solict(dev, &ifp->addr);
3954
63862b5b 3955 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3956
3957 read_lock_bh(&idev->lock);
622ccdf1 3958 spin_lock(&ifp->lock);
e9d3e084 3959 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3960 goto out;
1da177e4 3961
afb1d4b5 3962 net = dev_net(dev);
1da177e4 3963 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
afb1d4b5 3964 (net->ipv6.devconf_all->accept_dad < 1 &&
a2d3f3e3 3965 idev->cnf.accept_dad < 1) ||
55ebaef1
NT		 3966 !(ifp->flags&IFA_F_TENTATIVE) ||
3967 ifp->flags & IFA_F_NODAD) {
c76fe2d9
DA		 3968 bool send_na = false;
3969
3970 if (ifp->flags & IFA_F_TENTATIVE &&
3971 !(ifp->flags & IFA_F_OPTIMISTIC))
3972 send_na = true;
764d3be6 3973 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3974 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3975 spin_unlock(&ifp->lock);
1da177e4
LT		 3976 read_unlock_bh(&idev->lock);
3977
c76fe2d9 3978 addrconf_dad_completed(ifp, bump_id, send_na);
1da177e4
LT		 3979 return;
3980 }
3981
6732bade 3982 if (!(idev->if_flags & IF_READY)) {
21809faf 3983 spin_unlock(&ifp->lock);
6732bade 3984 read_unlock_bh(&idev->lock);
3c21edbd 3985 /*
590a9887 3986 * If the device is not ready:
3c21edbd
YH		 3987 * - keep it tentative if it is a permanent address.
3988 * - otherwise, kill it.
3989 */
3990 in6_ifa_hold(ifp);
cc411d0b 3991 addrconf_dad_stop(ifp, 0);
6732bade 3992 return;
3c21edbd 3993 }
95c385b4
NH		 3994
3995 /*
3996 * Optimistic nodes can start receiving
3997 * Frames right away
3998 */
7fd2561e 3999 if (ifp->flags & IFA_F_OPTIMISTIC) {
afb1d4b5
DA		 4000 ip6_ins_rt(net, ifp->rt);
4001 if (ipv6_use_optimistic_addr(net, idev)) {
7fd2561e
EK		 4002 /* Because optimistic nodes can use this address,
4003 * notify listeners. If DAD fails, RTM_DELADDR is sent.
4004 */
16186a82 4005 notify = true;
7fd2561e
EK		 4006 }
4007 }
95c385b4 4008
6732bade 4009 addrconf_dad_kick(ifp);
1da177e4 4010out:
622ccdf1 4011 spin_unlock(&ifp->lock);
1da177e4 4012 read_unlock_bh(&idev->lock);
16186a82
SAK		 4013 if (notify)
4014 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 4015}
4016
c15b1cca 4017static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 4018{
c15b1cca
HFS		 4019 bool begin_dad = false;
4020
8e8e676d 4021 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 4022 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4023 ifp->state = INET6_IFADDR_STATE_PREDAD;
4024 begin_dad = true;
4025 }
8e8e676d 4026 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 4027
4028 if (begin_dad)
4029 addrconf_mod_dad_work(ifp, 0);
4030}
4031
4032static void addrconf_dad_work(struct work_struct *w)
4033{
4034 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4035 struct inet6_ifaddr,
4036 dad_work);
1da177e4 4037 struct inet6_dev *idev = ifp->idev;
764d3be6 4038 bool bump_id, disable_ipv6 = false;
1da177e4
LT		 4039 struct in6_addr mcaddr;
4040
c15b1cca
HFS		 4041 enum {
4042 DAD_PROCESS,
4043 DAD_BEGIN,
4044 DAD_ABORT,
4045 } action = DAD_PROCESS;
4046
4047 rtnl_lock();
4048
8e8e676d 4049 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 4050 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4051 action = DAD_BEGIN;
4052 ifp->state = INET6_IFADDR_STATE_DAD;
4053 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4054 action = DAD_ABORT;
4055 ifp->state = INET6_IFADDR_STATE_POSTDAD;
85b51b12 4056
35e015e1
MC		 4057 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4058 idev->cnf.accept_dad > 1) &&
4059 !idev->cnf.disable_ipv6 &&
85b51b12
MM		 4060 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4061 struct in6_addr addr;
4062
4063 addr.s6_addr32[0] = htonl(0xfe800000);
4064 addr.s6_addr32[1] = 0;
4065
4066 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4067 ipv6_addr_equal(&ifp->addr, &addr)) {
4068 /* DAD failed for link-local based on MAC */
4069 idev->cnf.disable_ipv6 = 1;
4070
4071 pr_info("%s: IPv6 being disabled!\n",
4072 ifp->idev->dev->name);
4073 disable_ipv6 = true;
4074 }
4075 }
c15b1cca 4076 }
8e8e676d 4077 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 4078
4079 if (action == DAD_BEGIN) {
4080 addrconf_dad_begin(ifp);
4081 goto out;
4082 } else if (action == DAD_ABORT) {
751eb6b6 4083 in6_ifa_hold(ifp);
c15b1cca 4084 addrconf_dad_stop(ifp, 1);
85b51b12
MM		 4085 if (disable_ipv6)
4086 addrconf_ifdown(idev->dev, 0);
c15b1cca
HFS		 4087 goto out;
4088 }
4089
b7b1bfce 4090 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 4091 goto out;
4092
c15b1cca 4093 write_lock_bh(&idev->lock);
8ae72cbf
DA		 4094 if (idev->dead || !(idev->if_flags & IF_READY)) {
4095 write_unlock_bh(&idev->lock);
4096 goto out;
4097 }
4098
21809faf 4099 spin_lock(&ifp->lock);
622ccdf1
HX		 4100 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4101 spin_unlock(&ifp->lock);
c15b1cca 4102 write_unlock_bh(&idev->lock);
622ccdf1
HX		 4103 goto out;
4104 }
4105
b7b1bfce 4106 if (ifp->dad_probes == 0) {
c76fe2d9
DA		 4107 bool send_na = false;
4108
1da177e4
LT		 4109 /*
4110 * DAD was successful
4111 */
4112
c76fe2d9
DA		 4113 if (ifp->flags & IFA_F_TENTATIVE &&
4114 !(ifp->flags & IFA_F_OPTIMISTIC))
4115 send_na = true;
764d3be6 4116 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 4117 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 4118 spin_unlock(&ifp->lock);
c15b1cca 4119 write_unlock_bh(&idev->lock);
1da177e4 4120
c76fe2d9 4121 addrconf_dad_completed(ifp, bump_id, send_na);
1da177e4
LT		 4122
4123 goto out;
4124 }
4125
b7b1bfce 4126 ifp->dad_probes--;
c15b1cca
HFS		 4127 addrconf_mod_dad_work(ifp,
4128 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 4129 spin_unlock(&ifp->lock);
c15b1cca 4130 write_unlock_bh(&idev->lock);
1da177e4
LT		 4131
4132 /* send a neighbour solicitation for our addr */
1da177e4 4133 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
adc176c5
EN		 4134 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4135 ifp->dad_nonce);
1da177e4
LT		 4136out:
4137 in6_ifa_put(ifp);
c15b1cca 4138 rtnl_unlock();
1da177e4
LT		 4139}
4140
11ffff75
HFS		 4141/* ifp->idev must be at least read locked */
4142static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4143{
4144 struct inet6_ifaddr *ifpiter;
4145 struct inet6_dev *idev = ifp->idev;
4146
602582ca
HFS		 4147 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4148 if (ifpiter->scope > IFA_LINK)
4149 break;
11ffff75
HFS		 4150 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4151 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4152 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4153 IFA_F_PERMANENT)
4154 return false;
4155 }
4156 return true;
4157}
4158
c76fe2d9
DA		 4159static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4160 bool send_na)
1da177e4 4161{
e21e8467 4162 struct net_device *dev = ifp->idev->dev;
b7b1bfce 4163 struct in6_addr lladdr;
b173ee48 4164 bool send_rs, send_mld;
b7b1bfce 4165
c15b1cca 4166 addrconf_del_dad_work(ifp);
1da177e4
LT		 4167
4168 /*
4169 * Configure the address for reception. Now it is valid.
4170 */
4171
4172 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4173
026359bc
TA		 4174 /* If added prefix is link local and we are prepared to process
4175 router advertisements, start sending router solicitations.
1da177e4
LT		 4176 */
4177
1ec047eb 4178 read_lock_bh(&ifp->idev->lock);
11ffff75 4179 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 4180 send_rs = send_mld &&
4181 ipv6_accept_ra(ifp->idev) &&
bd11f074 4182 ifp->idev->cnf.rtr_solicits != 0 &&
b173ee48 4183 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 4184 read_unlock_bh(&ifp->idev->lock);
4185
b173ee48
HFS		 4186 /* While dad is in progress mld report's source address is in6_addrany.
4187 * Resend with proper ll now.
4188 */
4189 if (send_mld)
4190 ipv6_mc_dad_complete(ifp->idev);
4191
c76fe2d9
DA		 4192 /* send unsolicited NA if enabled */
4193 if (send_na &&
4194 (ifp->idev->cnf.ndisc_notify ||
4195 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4196 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4197 /*router=*/ !!ifp->idev->cnf.forwarding,
4198 /*solicited=*/ false, /*override=*/ true,
4199 /*inc_opt=*/ true);
4200 }
4201
1ec047eb 4202 if (send_rs) {
1da177e4
LT		 4203 /*
4204 * If a host as already performed a random delay
4205 * [...] as part of DAD [...] there is no need
4206 * to delay again before sending the first RS
4207 */
1ec047eb 4208 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 4209 return;
1ec047eb 4210 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 4211
b7b1bfce
HFS		 4212 write_lock_bh(&ifp->idev->lock);
4213 spin_lock(&ifp->lock);
bd11f074
MŻ		 4214 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4215 ifp->idev->cnf.rtr_solicit_interval);
b7b1bfce 4216 ifp->idev->rs_probes = 1;
1da177e4 4217 ifp->idev->if_flags |= IF_RS_SENT;
bd11f074 4218 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
b7b1bfce
HFS		 4219 spin_unlock(&ifp->lock);
4220 write_unlock_bh(&ifp->idev->lock);
1da177e4 4221 }
764d3be6
PA		 4222
4223 if (bump_id)
4224 rt_genid_bump_ipv6(dev_net(dev));
a11a7f71
MH		 4225
4226 /* Make sure that a new temporary address will be created
4227 * before this temporary address becomes deprecated.
4228 */
4229 if (ifp->flags & IFA_F_TEMPORARY)
4230 addrconf_verify_rtnl();
1da177e4
LT		 4231}
4232
896585d4 4233static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
e21e8467 4234{
c5e33bdd
YH		 4235 struct inet6_ifaddr *ifp;
4236
4237 read_lock_bh(&idev->lock);
502a2ffd 4238 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 4239 spin_lock(&ifp->lock);
896585d4
HL		 4240 if ((ifp->flags & IFA_F_TENTATIVE &&
4241 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4242 if (restart)
4243 ifp->state = INET6_IFADDR_STATE_PREDAD;
f2344a13 4244 addrconf_dad_kick(ifp);
896585d4 4245 }
21809faf 4246 spin_unlock(&ifp->lock);
c5e33bdd
YH		 4247 }
4248 read_unlock_bh(&idev->lock);
4249}
4250
1da177e4
LT		 4251#ifdef CONFIG_PROC_FS
4252struct if6_iter_state {
3c40090a 4253 struct seq_net_private p;
1da177e4 4254 int bucket;
1d578303 4255 int offset;
1da177e4
LT		 4256};
4257
1d578303 4258static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4 4259{
1da177e4 4260 struct if6_iter_state *state = seq->private;
1218854a 4261 struct net *net = seq_file_net(seq);
a5c1d98f 4262 struct inet6_ifaddr *ifa = NULL;
1d578303 4263 int p = 0;
1da177e4 4264
1d578303
MM		 4265 /* initial bucket if pos is 0 */
4266 if (pos == 0) {
4267 state->bucket = 0;
4268 state->offset = 0;
4269 }
4270
4271 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
a5c1d98f 4272 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
1d578303 4273 addr_lst) {
9f0d3c27
ED		 4274 if (!net_eq(dev_net(ifa->idev->dev), net))
4275 continue;
1d578303
MM		 4276 /* sync with offset */
4277 if (p < state->offset) {
4278 p++;
4279 continue;
4280 }
9f0d3c27 4281 return ifa;
1d578303
MM		 4282 }
4283
4284 /* prepare for next bucket */
4285 state->offset = 0;
4286 p = 0;
1da177e4 4287 }
c2e21293 4288 return NULL;
1da177e4
LT		 4289}
4290
c2e21293 4291static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4292 struct inet6_ifaddr *ifa)
1da177e4
LT		 4293{
4294 struct if6_iter_state *state = seq->private;
1218854a 4295 struct net *net = seq_file_net(seq);
1da177e4 4296
a5c1d98f 4297 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
9f0d3c27
ED		 4298 if (!net_eq(dev_net(ifa->idev->dev), net))
4299 continue;
1d578303 4300 state->offset++;
9f0d3c27 4301 return ifa;
1d578303 4302 }
3c40090a 4303
86f9bd1f 4304 state->offset = 0;
c2e21293 4305 while (++state->bucket < IN6_ADDR_HSIZE) {
a5c1d98f 4306 hlist_for_each_entry_rcu(ifa,
c2e21293 4307 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 4308 if (!net_eq(dev_net(ifa->idev->dev), net))
4309 continue;
9f0d3c27 4310 return ifa;
c2e21293 4311 }
1da177e4 4312 }
3c40090a 4313
c2e21293 4314 return NULL;
1da177e4
LT		 4315}
4316
1da177e4 4317static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
a5c1d98f 4318 __acquires(rcu)
1da177e4 4319{
a5c1d98f 4320 rcu_read_lock();
1d578303 4321 return if6_get_first(seq, *pos);
1da177e4
LT		 4322}
4323
4324static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4325{
4326 struct inet6_ifaddr *ifa;
4327
4328 ifa = if6_get_next(seq, v);
4329 ++*pos;
4330 return ifa;
4331}
4332
4333static void if6_seq_stop(struct seq_file *seq, void *v)
a5c1d98f 4334 __releases(rcu)
1da177e4 4335{
a5c1d98f 4336 rcu_read_unlock();
1da177e4
LT		 4337}
4338
4339static int if6_seq_show(struct seq_file *seq, void *v)
4340{
4341 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4342 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4343 &ifp->addr,
1da177e4
LT		 4344 ifp->idev->dev->ifindex,
4345 ifp->prefix_len,
4346 ifp->scope,
971a351c 4347 (u8) ifp->flags,
1da177e4
LT		 4348 ifp->idev->dev->name);
4349 return 0;
4350}
4351
56b3d975 4352static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4353 .start = if6_seq_start,
4354 .next = if6_seq_next,
4355 .show = if6_seq_show,
4356 .stop = if6_seq_stop,
4357};
4358
2c8c1e72 4359static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4360{
c3506372
CH		 4361 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4362 sizeof(struct if6_iter_state)))
1da177e4
LT		 4363 return -ENOMEM;
4364 return 0;
4365}
4366
2c8c1e72 4367static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4368{
ece31ffd 4369 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4370}
4371
4372static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4373 .init = if6_proc_net_init,
4374 .exit = if6_proc_net_exit,
3c40090a
DL		 4375};
4376
4377int __init if6_proc_init(void)
4378{
4379 return register_pernet_subsys(&if6_proc_net_ops);
4380}
4381
1da177e4
LT		 4382void if6_proc_exit(void)
4383{
3c40090a 4384 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4385}
4386#endif /* CONFIG_PROC_FS */
4387
07a93626 4388#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4389/* Check if address is a home address configured on any interface. */
b71d1d42 4390int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c 4391{
3f27fb23 4392 unsigned int hash = inet6_addr_hash(net, addr);
c2e21293 4393 struct inet6_ifaddr *ifp = NULL;
3f27fb23 4394 int ret = 0;
c2e21293 4395
4e5f47ab
ED		 4396 rcu_read_lock();
4397 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 4398 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 4399 continue;
caad295f 4400 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4401 (ifp->flags & IFA_F_HOMEADDRESS)) {
4402 ret = 1;
4403 break;
4404 }
4405 }
4e5f47ab 4406 rcu_read_unlock();
3b9f9a1c
NT		 4407 return ret;
4408}
4409#endif
4410
1da177e4
LT		 4411/*
4412 * Periodic address status verification
4413 */
4414
c15b1cca 4415static void addrconf_verify_rtnl(void)
1da177e4 4416{
b2db7564 4417 unsigned long now, next, next_sec, next_sched;
1da177e4 4418 struct inet6_ifaddr *ifp;
1da177e4
LT		 4419 int i;
4420
c15b1cca
HFS		 4421 ASSERT_RTNL();
4422
5c578aed 4423 rcu_read_lock_bh();
1da177e4 4424 now = jiffies;
b2db7564 4425 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4426
c15b1cca 4427 cancel_delayed_work(&addr_chk_work);
1da177e4 4428
bcdd553f 4429 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4430restart:
c15b1cca 4431 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 4432 unsigned long age;
1da177e4 4433
fad8da3e
YA		 4434 /* When setting preferred_lft to a value not zero or
4435 * infinity, while valid_lft is infinity
4436 * IFA_F_PERMANENT has a non-infinity life time.
4437 */
4438 if ((ifp->flags & IFA_F_PERMANENT) &&
4439 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4440 continue;
4441
4442 spin_lock(&ifp->lock);
b2db7564
YH		 4443 /* We try to batch several events at once. */
4444 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4445
8f27ebb9
YH		 4446 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4447 age >= ifp->valid_lft) {
1da177e4
LT		 4448 spin_unlock(&ifp->lock);
4449 in6_ifa_hold(ifp);
1da177e4
LT		 4450 ipv6_del_addr(ifp);
4451 goto restart;
8f27ebb9
YH		 4452 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4453 spin_unlock(&ifp->lock);
4454 continue;
1da177e4 4455 } else if (age >= ifp->prefered_lft) {
a1ed0526 4456 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4457 int deprecate = 0;
4458
4459 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4460 deprecate = 1;
4461 ifp->flags |= IFA_F_DEPRECATED;
4462 }
4463
fad8da3e
YA		 4464 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4465 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4466 next = ifp->tstamp + ifp->valid_lft * HZ;
4467
4468 spin_unlock(&ifp->lock);
4469
4470 if (deprecate) {
4471 in6_ifa_hold(ifp);
1da177e4
LT		 4472
4473 ipv6_ifa_notify(0, ifp);
4474 in6_ifa_put(ifp);
4475 goto restart;
4476 }
1da177e4
LT		 4477 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4478 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4479 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4480 ifp->idev->cnf.dad_transmits *
1f9248e5 4481 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 4482
1da177e4
LT		 4483 if (age >= ifp->prefered_lft - regen_advance) {
4484 struct inet6_ifaddr *ifpub = ifp->ifpub;
4485 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4486 next = ifp->tstamp + ifp->prefered_lft * HZ;
4487 if (!ifp->regen_count && ifpub) {
4488 ifp->regen_count++;
4489 in6_ifa_hold(ifp);
4490 in6_ifa_hold(ifpub);
4491 spin_unlock(&ifp->lock);
5c578aed 4492
291d809b
HY		 4493 spin_lock(&ifpub->lock);
4494 ifpub->regen_count = 0;
4495 spin_unlock(&ifpub->lock);
e64e469b 4496 rcu_read_unlock_bh();
fffcefe9 4497 ipv6_create_tempaddr(ifpub, ifp, true);
1da177e4
LT		 4498 in6_ifa_put(ifpub);
4499 in6_ifa_put(ifp);
e64e469b 4500 rcu_read_lock_bh();
1da177e4
LT		 4501 goto restart;
4502 }
4503 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4504 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4505 spin_unlock(&ifp->lock);
1da177e4
LT		 4506 } else {
4507 /* ifp->prefered_lft <= ifp->valid_lft */
4508 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4509 next = ifp->tstamp + ifp->prefered_lft * HZ;
4510 spin_unlock(&ifp->lock);
4511 }
4512 }
1da177e4
LT		 4513 }
4514
b2db7564
YH		 4515 next_sec = round_jiffies_up(next);
4516 next_sched = next;
4517
4518 /* If rounded timeout is accurate enough, accept it. */
4519 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4520 next_sched = next_sec;
4521
4522 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4523 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4524 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4525
e32ac250
JP		 4526 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4527 now, next, next_sec, next_sched);
c15b1cca 4528 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4529 rcu_read_unlock_bh();
1da177e4
LT		 4530}
4531
c15b1cca
HFS		 4532static void addrconf_verify_work(struct work_struct *w)
4533{
4534 rtnl_lock();
4535 addrconf_verify_rtnl();
4536 rtnl_unlock();
4537}
4538
4539static void addrconf_verify(void)
4540{
4541 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4542}
4543
caeaba79
ND		 4544static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4545 struct in6_addr **peer_pfx)
461d8837
TG		 4546{
4547 struct in6_addr *pfx = NULL;
4548
caeaba79
ND		 4549 *peer_pfx = NULL;
4550
461d8837
TG		 4551 if (addr)
4552 pfx = nla_data(addr);
4553
4554 if (local) {
4555 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4556 *peer_pfx = pfx;
4557 pfx = nla_data(local);
461d8837
TG		 4558 }
4559
4560 return pfx;
4561}
4562
ef7c79ed 4563static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4564 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4565 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4566 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4567 [IFA_FLAGS] = { .len = sizeof(u32) },
8308f3ff 4568 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
6ecf4c37 4569 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
461d8837
TG		 4570};
4571
1da177e4 4572static int
c21ef3e3
DA		 4573inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4574 struct netlink_ext_ack *extack)
1da177e4 4575{
3b1e0a65 4576 struct net *net = sock_net(skb->sk);
b933f716
TG		 4577 struct ifaddrmsg *ifm;
4578 struct nlattr *tb[IFA_MAX+1];
caeaba79 4579 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4580 u32 ifa_flags;
b933f716 4581 int err;
1da177e4 4582
8cb08174
JB		 4583 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4584 ifa_ipv6_policy, extack);
b933f716
TG		 4585 if (err < 0)
4586 return err;
4587
4588 ifm = nlmsg_data(nlh);
caeaba79 4589 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4590 if (!pfx)
1da177e4
LT		 4591 return -EINVAL;
4592
6046d5b4
HK		 4593 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4594
4595 /* We ignore other flags so far. */
4596 ifa_flags &= IFA_F_MANAGETEMPADDR;
4597
4598 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4599 ifm->ifa_prefixlen);
1da177e4
LT		 4600}
4601
8308f3ff 4602static int modify_prefix_route(struct inet6_ifaddr *ifp,
4ef469ba
HL		 4603 unsigned long expires, u32 flags,
4604 bool modify_peer)
8308f3ff
DA		 4605{
4606 struct fib6_info *f6i;
e7c7faa9 4607 u32 prio;
8308f3ff 4608
4ef469ba
HL		 4609 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4610 ifp->prefix_len,
2b2450ca 4611 ifp->idev->dev, 0, RTF_DEFAULT, true);
8308f3ff
DA		 4612 if (!f6i)
4613 return -ENOENT;
4614
e7c7faa9
DA		 4615 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4616 if (f6i->fib6_metric != prio) {
4617 /* delete old one */
4618 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
4619
8308f3ff 4620 /* add new one */
4ef469ba
HL		 4621 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4622 ifp->prefix_len,
8308f3ff
DA		 4623 ifp->rt_priority, ifp->idev->dev,
4624 expires, flags, GFP_KERNEL);
8308f3ff
DA		 4625 } else {
4626 if (!expires)
4627 fib6_clean_expires(f6i);
4628 else
4629 fib6_set_expires(f6i, expires);
4630
4631 fib6_info_release(f6i);
4632 }
4633
4634 return 0;
4635}
4636
d169a1f8 4637static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
081bba5b 4638{
6f704992
YH		 4639 u32 flags;
4640 clock_t expires;
4bed72e4 4641 unsigned long timeout;
53bd6749 4642 bool was_managetempaddr;
5b84efec 4643 bool had_prefixroute;
18dbe65c 4644 bool new_peer = false;
46d48046 4645
c15b1cca
HFS		 4646 ASSERT_RTNL();
4647
d169a1f8 4648 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
081bba5b
NT		 4649 return -EINVAL;
4650
d169a1f8 4651 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
53bd6749
JP		 4652 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4653 return -EINVAL;
4654
f1c02cfb 4655 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
d169a1f8 4656 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
f1c02cfb 4657
d169a1f8 4658 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4bed72e4
YH		 4659 if (addrconf_finite_timeout(timeout)) {
4660 expires = jiffies_to_clock_t(timeout * HZ);
d169a1f8 4661 cfg->valid_lft = timeout;
6f704992 4662 flags = RTF_EXPIRES;
4bed72e4
YH		 4663 } else {
4664 expires = 0;
4665 flags = 0;
d169a1f8 4666 cfg->ifa_flags |= IFA_F_PERMANENT;
6f704992 4667 }
081bba5b 4668
d169a1f8 4669 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4bed72e4
YH		 4670 if (addrconf_finite_timeout(timeout)) {
4671 if (timeout == 0)
d169a1f8
DA		 4672 cfg->ifa_flags |= IFA_F_DEPRECATED;
4673 cfg->preferred_lft = timeout;
4bed72e4 4674 }
081bba5b 4675
18dbe65c
HL		 4676 if (cfg->peer_pfx &&
4677 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4678 if (!ipv6_addr_any(&ifp->peer_addr))
4679 cleanup_prefix_route(ifp, expires, true, true);
4680 new_peer = true;
4681 }
4682
081bba5b 4683 spin_lock_bh(&ifp->lock);
53bd6749 4684 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4685 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4686 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4687 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4688 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4689 IFA_F_NOPREFIXROUTE);
d169a1f8 4690 ifp->flags |= cfg->ifa_flags;
081bba5b 4691 ifp->tstamp = jiffies;
d169a1f8
DA		 4692 ifp->valid_lft = cfg->valid_lft;
4693 ifp->prefered_lft = cfg->preferred_lft;
081bba5b 4694
8308f3ff
DA		 4695 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4696 ifp->rt_priority = cfg->rt_priority;
081bba5b 4697
18dbe65c
HL		 4698 if (new_peer)
4699 ifp->peer_addr = *cfg->peer_pfx;
4700
081bba5b
NT		 4701 spin_unlock_bh(&ifp->lock);
4702 if (!(ifp->flags&IFA_F_TENTATIVE))
4703 ipv6_ifa_notify(0, ifp);
081bba5b 4704
d169a1f8 4705 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
8308f3ff
DA		 4706 int rc = -ENOENT;
4707
4708 if (had_prefixroute)
4ef469ba 4709 rc = modify_prefix_route(ifp, expires, flags, false);
8308f3ff
DA		 4710
4711 /* prefix route could have been deleted; if so restore it */
4712 if (rc == -ENOENT) {
4713 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4714 ifp->rt_priority, ifp->idev->dev,
4715 expires, flags, GFP_KERNEL);
4716 }
4ef469ba
HL		 4717
4718 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4719 rc = modify_prefix_route(ifp, expires, flags, true);
4720
4721 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4722 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4723 ifp->rt_priority, ifp->idev->dev,
4724 expires, flags, GFP_KERNEL);
4725 }
5b84efec
TH		 4726 } else if (had_prefixroute) {
4727 enum cleanup_prefix_rt_t action;
4728 unsigned long rt_expires;
4729
4730 write_lock_bh(&ifp->idev->lock);
4731 action = check_cleanup_prefix_route(ifp, &rt_expires);
4732 write_unlock_bh(&ifp->idev->lock);
4733
4734 if (action != CLEANUP_PREFIX_RT_NOP) {
4735 cleanup_prefix_route(ifp, rt_expires,
18dbe65c 4736 action == CLEANUP_PREFIX_RT_DEL, false);
5b84efec 4737 }
761aac73 4738 }
53bd6749
JP		 4739
4740 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
d169a1f8
DA		 4741 if (was_managetempaddr &&
4742 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4743 cfg->valid_lft = 0;
4744 cfg->preferred_lft = 0;
4745 }
4746 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4747 cfg->preferred_lft, !was_managetempaddr,
4748 jiffies);
53bd6749
JP		 4749 }
4750
c15b1cca 4751 addrconf_verify_rtnl();
081bba5b
NT		 4752
4753 return 0;
4754}
4755
1da177e4 4756static int
c21ef3e3
DA		 4757inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4758 struct netlink_ext_ack *extack)
1da177e4 4759{
3b1e0a65 4760 struct net *net = sock_net(skb->sk);
461d8837
TG		 4761 struct ifaddrmsg *ifm;
4762 struct nlattr *tb[IFA_MAX+1];
19b1518c 4763 struct in6_addr *peer_pfx;
7198f8ce
TG		 4764 struct inet6_ifaddr *ifa;
4765 struct net_device *dev;
f1c02cfb 4766 struct inet6_dev *idev;
19b1518c 4767 struct ifa6_config cfg;
461d8837 4768 int err;
1da177e4 4769
8cb08174
JB		 4770 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4771 ifa_ipv6_policy, extack);
461d8837
TG		 4772 if (err < 0)
4773 return err;
4774
19b1518c
DA		 4775 memset(&cfg, 0, sizeof(cfg));
4776
461d8837 4777 ifm = nlmsg_data(nlh);
19b1518c
DA		 4778 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4779 if (!cfg.pfx)
1da177e4
LT		 4780 return -EINVAL;
4781
19b1518c
DA		 4782 cfg.peer_pfx = peer_pfx;
4783 cfg.plen = ifm->ifa_prefixlen;
8308f3ff
DA		 4784 if (tb[IFA_RT_PRIORITY])
4785 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4786
19b1518c
DA		 4787 cfg.valid_lft = INFINITY_LIFE_TIME;
4788 cfg.preferred_lft = INFINITY_LIFE_TIME;
4789
461d8837 4790 if (tb[IFA_CACHEINFO]) {
0778769d 4791 struct ifa_cacheinfo *ci;
461d8837
TG		 4792
4793 ci = nla_data(tb[IFA_CACHEINFO]);
19b1518c
DA		 4794 cfg.valid_lft = ci->ifa_valid;
4795 cfg.preferred_lft = ci->ifa_prefered;
0778769d
NT		 4796 }
4797
af284937 4798 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4799 if (!dev)
7198f8ce
TG		 4800 return -ENODEV;
4801
19b1518c
DA		 4802 if (tb[IFA_FLAGS])
4803 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4804 else
4805 cfg.ifa_flags = ifm->ifa_flags;
479840ff 4806
55ebaef1 4807 /* We ignore other flags so far. */
19b1518c
DA		 4808 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4809 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4810 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
f1c02cfb
SD		 4811
4812 idev = ipv6_find_idev(dev);
db0b99f5
SD		 4813 if (IS_ERR(idev))
4814 return PTR_ERR(idev);
f1c02cfb
SD		 4815
4816 if (!ipv6_allow_optimistic_dad(net, idev))
19b1518c 4817 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
f1c02cfb 4818
19b1518c
DA		 4819 if (cfg.ifa_flags & IFA_F_NODAD &&
4820 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
f1c02cfb
SD		 4821 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4822 return -EINVAL;
4823 }
55ebaef1 4824
19b1518c 4825 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
63159f29 4826 if (!ifa) {
7198f8ce
TG		 4827 /*
4828 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4829 * userspace already relies on not having to provide this.
7198f8ce 4830 */
19b1518c 4831 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
081bba5b
NT		 4832 }
4833
7198f8ce
TG		 4834 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4835 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4836 err = -EEXIST;
4837 else
d169a1f8 4838 err = inet6_addr_modify(ifa, &cfg);
7198f8ce
TG		 4839
4840 in6_ifa_put(ifa);
4841
4842 return err;
1da177e4
LT		 4843}
4844
479840ff 4845static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4846 u8 scope, int ifindex)
4847{
4848 struct ifaddrmsg *ifm;
4849
4850 ifm = nlmsg_data(nlh);
4851 ifm->ifa_family = AF_INET6;
4852 ifm->ifa_prefixlen = prefixlen;
4853 ifm->ifa_flags = flags;
4854 ifm->ifa_scope = scope;
4855 ifm->ifa_index = ifindex;
4856}
4857
85486af0
TG		 4858static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4859 unsigned long tstamp, u32 preferred, u32 valid)
4860{
4861 struct ifa_cacheinfo ci;
4862
18a31e1e
TG		 4863 ci.cstamp = cstamp_delta(cstamp);
4864 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4865 ci.ifa_prefered = preferred;
4866 ci.ifa_valid = valid;
4867
4868 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4869}
4870
101bb229
TG		 4871static inline int rt_scope(int ifa_scope)
4872{
4873 if (ifa_scope & IFA_HOST)
4874 return RT_SCOPE_HOST;
4875 else if (ifa_scope & IFA_LINK)
4876 return RT_SCOPE_LINK;
4877 else if (ifa_scope & IFA_SITE)
4878 return RT_SCOPE_SITE;
4879 else
4880 return RT_SCOPE_UNIVERSE;
4881}
4882
0ab6803b
TG		 4883static inline int inet6_ifaddr_msgsize(void)
4884{
339bf98f 4885 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4886 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4887 + nla_total_size(16) /* IFA_ADDRESS */
479840ff 4888 + nla_total_size(sizeof(struct ifa_cacheinfo))
8308f3ff
DA		 4889 + nla_total_size(4) /* IFA_FLAGS */
4890 + nla_total_size(4) /* IFA_RT_PRIORITY */;
0ab6803b 4891}
c5396a31 4892
6ba1e6e8
DA		 4893enum addr_type_t {
4894 UNICAST_ADDR,
4895 MULTICAST_ADDR,
4896 ANYCAST_ADDR,
4897};
4898
203651b6
CB		 4899struct inet6_fill_args {
4900 u32 portid;
4901 u32 seq;
4902 int event;
4903 unsigned int flags;
4904 int netnsid;
6371a71f 4905 int ifindex;
6ba1e6e8 4906 enum addr_type_t type;
203651b6
CB		 4907};
4908
1da177e4 4909static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
203651b6 4910 struct inet6_fill_args *args)
1da177e4 4911{
1da177e4 4912 struct nlmsghdr *nlh;
85486af0 4913 u32 preferred, valid;
1da177e4 4914
203651b6
CB		 4915 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4916 sizeof(struct ifaddrmsg), args->flags);
63159f29 4917 if (!nlh)
26932566 4918 return -EMSGSIZE;
0ab6803b 4919
101bb229
TG		 4920 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4921 ifa->idev->dev->ifindex);
4922
203651b6
CB		 4923 if (args->netnsid >= 0 &&
4924 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
6ecf4c37
CB		 4925 goto error;
4926
5b35fa98 4927 spin_lock_bh(&ifa->lock);
fad8da3e
YA		 4928 if (!((ifa->flags&IFA_F_PERMANENT) &&
4929 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4930 preferred = ifa->prefered_lft;
4931 valid = ifa->valid_lft;
4932 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4933 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4934 if (preferred > tval)
4935 preferred -= tval;
4936 else
4937 preferred = 0;
f56619fc
BH		 4938 if (valid != INFINITY_LIFE_TIME) {
4939 if (valid > tval)
4940 valid -= tval;
4941 else
4942 valid = 0;
4943 }
1da177e4
LT		 4944 }
4945 } else {
85486af0
TG		 4946 preferred = INFINITY_LIFE_TIME;
4947 valid = INFINITY_LIFE_TIME;
4948 }
5b35fa98 4949 spin_unlock_bh(&ifa->lock);
85486af0 4950
7996c799 4951 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4952 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4953 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4954 goto error;
4955 } else
930345ea 4956 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4957 goto error;
4958
8308f3ff
DA		 4959 if (ifa->rt_priority &&
4960 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
4961 goto error;
4962
caeaba79
ND		 4963 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4964 goto error;
1da177e4 4965
479840ff
JP		 4966 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4967 goto error;
4968
053c095a
JB		 4969 nlmsg_end(skb, nlh);
4970 return 0;
caeaba79
ND		 4971
4972error:
4973 nlmsg_cancel(skb, nlh);
4974 return -EMSGSIZE;
1da177e4
LT		 4975}
4976
4977static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
203651b6 4978 struct inet6_fill_args *args)
1da177e4 4979{
1da177e4 4980 struct nlmsghdr *nlh;
101bb229
TG		 4981 u8 scope = RT_SCOPE_UNIVERSE;
4982 int ifindex = ifmca->idev->dev->ifindex;
4983
4984 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4985 scope = RT_SCOPE_SITE;
1da177e4 4986
203651b6
CB		 4987 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4988 sizeof(struct ifaddrmsg), args->flags);
63159f29 4989 if (!nlh)
26932566 4990 return -EMSGSIZE;
85486af0 4991
203651b6 4992 if (args->netnsid >= 0 &&
9419e2ed
ZQ		 4993 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
4994 nlmsg_cancel(skb, nlh);
6ecf4c37 4995 return -EMSGSIZE;
9419e2ed 4996 }
6ecf4c37 4997
0ab6803b 4998 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4999 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 5000 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 5001 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5002 nlmsg_cancel(skb, nlh);
5003 return -EMSGSIZE;
5004 }
85486af0 5005
053c095a
JB		 5006 nlmsg_end(skb, nlh);
5007 return 0;
1da177e4
LT		 5008}
5009
5010static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
203651b6 5011 struct inet6_fill_args *args)
1da177e4 5012{
9ee8cbb2
DA		 5013 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5014 int ifindex = dev ? dev->ifindex : 1;
1da177e4 5015 struct nlmsghdr *nlh;
101bb229 5016 u8 scope = RT_SCOPE_UNIVERSE;
101bb229
TG		 5017
5018 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5019 scope = RT_SCOPE_SITE;
1da177e4 5020
203651b6
CB		 5021 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5022 sizeof(struct ifaddrmsg), args->flags);
63159f29 5023 if (!nlh)
26932566 5024 return -EMSGSIZE;
85486af0 5025
203651b6 5026 if (args->netnsid >= 0 &&
9419e2ed
ZQ		 5027 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5028 nlmsg_cancel(skb, nlh);
6ecf4c37 5029 return -EMSGSIZE;
9419e2ed 5030 }
6ecf4c37 5031
0ab6803b 5032 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 5033 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 5034 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 5035 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5036 nlmsg_cancel(skb, nlh);
5037 return -EMSGSIZE;
5038 }
1da177e4 5039
053c095a
JB		 5040 nlmsg_end(skb, nlh);
5041 return 0;
1da177e4
LT		 5042}
5043
234b27c3
ED		 5044/* called with rcu_read_lock() */
5045static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
fe884c2b 5046 struct netlink_callback *cb, int s_ip_idx,
6ba1e6e8 5047 struct inet6_fill_args *fillargs)
234b27c3 5048{
234b27c3
ED		 5049 struct ifmcaddr6 *ifmca;
5050 struct ifacaddr6 *ifaca;
fe884c2b 5051 int ip_idx = 0;
234b27c3 5052 int err = 1;
234b27c3
ED		 5053
5054 read_lock_bh(&idev->lock);
6ba1e6e8 5055 switch (fillargs->type) {
502a2ffd 5056 case UNICAST_ADDR: {
5057 struct inet6_ifaddr *ifa;
6ba1e6e8 5058 fillargs->event = RTM_NEWADDR;
502a2ffd 5059
234b27c3 5060 /* unicast address incl. temp addr */
502a2ffd 5061 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4ba4c566
DA		 5062 if (ip_idx < s_ip_idx)
5063 goto next;
6ba1e6e8 5064 err = inet6_fill_ifaddr(skb, ifa, fillargs);
053c095a 5065 if (err < 0)
234b27c3 5066 break;
63998ac2 5067 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4ba4c566
DA		 5068next:
5069 ip_idx++;
234b27c3
ED		 5070 }
5071 break;
502a2ffd 5072 }
234b27c3 5073 case MULTICAST_ADDR:
6ba1e6e8 5074 fillargs->event = RTM_GETMULTICAST;
203651b6 5075
234b27c3
ED		 5076 /* multicast address */
5077 for (ifmca = idev->mc_list; ifmca;
5078 ifmca = ifmca->next, ip_idx++) {
5079 if (ip_idx < s_ip_idx)
5080 continue;
6ba1e6e8 5081 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
053c095a 5082 if (err < 0)
234b27c3
ED		 5083 break;
5084 }
5085 break;
5086 case ANYCAST_ADDR:
6ba1e6e8 5087 fillargs->event = RTM_GETANYCAST;
234b27c3
ED		 5088 /* anycast address */
5089 for (ifaca = idev->ac_list; ifaca;
5090 ifaca = ifaca->aca_next, ip_idx++) {
5091 if (ip_idx < s_ip_idx)
5092 continue;
6ba1e6e8 5093 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
053c095a 5094 if (err < 0)
234b27c3
ED		 5095 break;
5096 }
5097 break;
5098 default:
5099 break;
5100 }
5101 read_unlock_bh(&idev->lock);
fe884c2b 5102 cb->args[2] = ip_idx;
234b27c3
ED		 5103 return err;
5104}
5105
ed6eff11
DA		 5106static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5107 struct inet6_fill_args *fillargs,
5108 struct net **tgt_net, struct sock *sk,
6371a71f 5109 struct netlink_callback *cb)
ed6eff11 5110{
6371a71f 5111 struct netlink_ext_ack *extack = cb->extack;
ed6eff11
DA		 5112 struct nlattr *tb[IFA_MAX+1];
5113 struct ifaddrmsg *ifm;
5114 int err, i;
5115
5116 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5117 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5118 return -EINVAL;
5119 }
5120
5121 ifm = nlmsg_data(nlh);
5122 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5123 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5124 return -EINVAL;
5125 }
6371a71f
DA		 5126
5127 fillargs->ifindex = ifm->ifa_index;
5128 if (fillargs->ifindex) {
5129 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5130 fillargs->flags |= NLM_F_DUMP_FILTERED;
ed6eff11
DA		 5131 }
5132
8cb08174
JB		 5133 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5134 ifa_ipv6_policy, extack);
ed6eff11
DA		 5135 if (err < 0)
5136 return err;
5137
5138 for (i = 0; i <= IFA_MAX; ++i) {
5139 if (!tb[i])
5140 continue;
5141
5142 if (i == IFA_TARGET_NETNSID) {
5143 struct net *net;
5144
5145 fillargs->netnsid = nla_get_s32(tb[i]);
5146 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5147 if (IS_ERR(net)) {
bf4cc40e 5148 fillargs->netnsid = -1;
ed6eff11
DA		 5149 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5150 return PTR_ERR(net);
5151 }
5152 *tgt_net = net;
5153 } else {
5154 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5155 return -EINVAL;
5156 }
5157 }
5158
5159 return 0;
5160}
5161
1da177e4
LT		 5162static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5163 enum addr_type_t type)
5164{
ed6eff11 5165 const struct nlmsghdr *nlh = cb->nlh;
6ba1e6e8
DA		 5166 struct inet6_fill_args fillargs = {
5167 .portid = NETLINK_CB(cb->skb).portid,
5168 .seq = cb->nlh->nlmsg_seq,
5169 .flags = NLM_F_MULTI,
5170 .netnsid = -1,
5171 .type = type,
5172 };
234b27c3 5173 struct net *net = sock_net(skb->sk);
6ecf4c37 5174 struct net *tgt_net = net;
fe884c2b 5175 int idx, s_idx, s_ip_idx;
234b27c3 5176 int h, s_h;
1da177e4 5177 struct net_device *dev;
234b27c3
ED		 5178 struct inet6_dev *idev;
5179 struct hlist_head *head;
242afaa6 5180 int err = 0;
1ab1457c 5181
234b27c3
ED		 5182 s_h = cb->args[0];
5183 s_idx = idx = cb->args[1];
fe884c2b 5184 s_ip_idx = cb->args[2];
5d5619b4 5185
ed6eff11 5186 if (cb->strict_check) {
ed6eff11 5187 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
6371a71f 5188 skb->sk, cb);
ed6eff11 5189 if (err < 0)
242afaa6 5190 goto put_tgt_net;
6371a71f 5191
242afaa6 5192 err = 0;
6371a71f
DA		 5193 if (fillargs.ifindex) {
5194 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
242afaa6
DA		 5195 if (!dev) {
5196 err = -ENODEV;
5197 goto put_tgt_net;
5198 }
6371a71f
DA		 5199 idev = __in6_dev_get(dev);
5200 if (idev) {
5201 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5202 &fillargs);
1518039f
JK		 5203 if (err > 0)
5204 err = 0;
6371a71f
DA		 5205 }
5206 goto put_tgt_net;
5207 }
6ecf4c37
CB		 5208 }
5209
234b27c3 5210 rcu_read_lock();
6ecf4c37 5211 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
234b27c3
ED		 5212 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5213 idx = 0;
6ecf4c37 5214 head = &tgt_net->dev_index_head[h];
b67bfe0d 5215 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 5216 if (idx < s_idx)
5217 goto cont;
4b97efdf 5218 if (h > s_h || idx > s_idx)
234b27c3 5219 s_ip_idx = 0;
e21e8467
SH		 5220 idev = __in6_dev_get(dev);
5221 if (!idev)
234b27c3
ED		 5222 goto cont;
5223
fe884c2b 5224 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
6ba1e6e8 5225 &fillargs) < 0)
234b27c3 5226 goto done;
7562f876 5227cont:
234b27c3
ED		 5228 idx++;
5229 }
1da177e4 5230 }
234b27c3
ED		 5231done:
5232 rcu_read_unlock();
5233 cb->args[0] = h;
5234 cb->args[1] = idx;
6371a71f 5235put_tgt_net:
6ba1e6e8 5236 if (fillargs.netnsid >= 0)
6ecf4c37 5237 put_net(tgt_net);
234b27c3 5238
7c1e8a38 5239 return skb->len ? : err;
1da177e4
LT		 5240}
5241
5242static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5243{
5244 enum addr_type_t type = UNICAST_ADDR;
b854272b 5245
1da177e4
LT		 5246 return inet6_dump_addr(skb, cb, type);
5247}
5248
5249static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5250{
5251 enum addr_type_t type = MULTICAST_ADDR;
b854272b 5252
1da177e4
LT		 5253 return inet6_dump_addr(skb, cb, type);
5254}
5255
5256
5257static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5258{
5259 enum addr_type_t type = ANYCAST_ADDR;
b854272b 5260
1da177e4
LT		 5261 return inet6_dump_addr(skb, cb, type);
5262}
5263
4b1373de
JK		 5264static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5265 const struct nlmsghdr *nlh,
5266 struct nlattr **tb,
5267 struct netlink_ext_ack *extack)
5268{
5269 struct ifaddrmsg *ifm;
5270 int i, err;
5271
5272 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5273 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5274 return -EINVAL;
5275 }
5276
61ddb39c
HL		 5277 if (!netlink_strict_get_check(skb))
5278 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5279 ifa_ipv6_policy, extack);
5280
4b1373de
JK		 5281 ifm = nlmsg_data(nlh);
5282 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5283 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5284 return -EINVAL;
5285 }
5286
8cb08174
JB		 5287 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5288 ifa_ipv6_policy, extack);
4b1373de
JK		 5289 if (err)
5290 return err;
5291
5292 for (i = 0; i <= IFA_MAX; i++) {
5293 if (!tb[i])
5294 continue;
5295
5296 switch (i) {
5297 case IFA_TARGET_NETNSID:
5298 case IFA_ADDRESS:
5299 case IFA_LOCAL:
5300 break;
5301 default:
5302 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5303 return -EINVAL;
5304 }
5305 }
5306
5307 return 0;
5308}
5309
c21ef3e3
DA		 5310static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5311 struct netlink_ext_ack *extack)
6c223828 5312{
3b1e0a65 5313 struct net *net = sock_net(in_skb->sk);
203651b6
CB		 5314 struct inet6_fill_args fillargs = {
5315 .portid = NETLINK_CB(in_skb).portid,
5316 .seq = nlh->nlmsg_seq,
5317 .event = RTM_NEWADDR,
5318 .flags = 0,
5319 .netnsid = -1,
5320 };
6ecf4c37 5321 struct net *tgt_net = net;
1b29fc2c
TG		 5322 struct ifaddrmsg *ifm;
5323 struct nlattr *tb[IFA_MAX+1];
caeaba79 5324 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 5325 struct net_device *dev = NULL;
5326 struct inet6_ifaddr *ifa;
5327 struct sk_buff *skb;
6c223828
NT		 5328 int err;
5329
4b1373de 5330 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
1b29fc2c 5331 if (err < 0)
c24675f8 5332 return err;
1b29fc2c 5333
6ecf4c37 5334 if (tb[IFA_TARGET_NETNSID]) {
203651b6 5335 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
6ecf4c37
CB		 5336
5337 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
203651b6 5338 fillargs.netnsid);
6ecf4c37
CB		 5339 if (IS_ERR(tgt_net))
5340 return PTR_ERR(tgt_net);
5341 }
5342
caeaba79 5343 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
c24675f8
FW		 5344 if (!addr)
5345 return -EINVAL;
6c223828 5346
1b29fc2c 5347 ifm = nlmsg_data(nlh);
6c223828 5348 if (ifm->ifa_index)
6ecf4c37 5349 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
6c223828 5350
6ecf4c37 5351 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
e21e8467 5352 if (!ifa) {
1b29fc2c
TG		 5353 err = -EADDRNOTAVAIL;
5354 goto errout;
5355 }
6c223828 5356
e21e8467
SH		 5357 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5358 if (!skb) {
6c223828 5359 err = -ENOBUFS;
1b29fc2c 5360 goto errout_ifa;
6c223828
NT		 5361 }
5362
203651b6 5363 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
26932566
PM		 5364 if (err < 0) {
5365 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5366 WARN_ON(err == -EMSGSIZE);
5367 kfree_skb(skb);
5368 goto errout_ifa;
5369 }
6ecf4c37 5370 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
1b29fc2c 5371errout_ifa:
6c223828 5372 in6_ifa_put(ifa);
1b29fc2c 5373errout:
c24675f8
FW		 5374 if (dev)
5375 dev_put(dev);
203651b6 5376 if (fillargs.netnsid >= 0)
6ecf4c37
CB		 5377 put_net(tgt_net);
5378
6c223828 5379 return err;
6c223828
NT		 5380}
5381
1da177e4
LT		 5382static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5383{
5384 struct sk_buff *skb;
c346dca1 5385 struct net *net = dev_net(ifa->idev->dev);
203651b6
CB		 5386 struct inet6_fill_args fillargs = {
5387 .portid = 0,
5388 .seq = 0,
5389 .event = event,
5390 .flags = 0,
5391 .netnsid = -1,
5392 };
5d620266 5393 int err = -ENOBUFS;
1da177e4 5394
0ab6803b 5395 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 5396 if (!skb)
5d620266
TG		 5397 goto errout;
5398
203651b6 5399 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
26932566
PM		 5400 if (err < 0) {
5401 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5402 WARN_ON(err == -EMSGSIZE);
5403 kfree_skb(skb);
5404 goto errout;
5405 }
1ce85fe4
PNA		 5406 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5407 return;
5d620266
TG		 5408errout:
5409 if (err < 0)
6fda7350 5410 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 5411}
5412
b6f99a21 5413static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 5414 __s32 *array, int bytes)
5415{
04561c1f
TG		 5416 BUG_ON(bytes < (DEVCONF_MAX * 4));
5417
1da177e4
LT		 5418 memset(array, 0, bytes);
5419 array[DEVCONF_FORWARDING] = cnf->forwarding;
5420 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5421 array[DEVCONF_MTU6] = cnf->mtu6;
5422 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5423 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5424 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5425 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5426 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 5427 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5428 jiffies_to_msecs(cnf->rtr_solicit_interval);
bd11f074
MŻ		 5429 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5430 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
93908d19
TG		 5431 array[DEVCONF_RTR_SOLICIT_DELAY] =
5432 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 5433 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 5434 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5435 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5436 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5437 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 5438 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5439 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5440 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5441 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5442 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 5443 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 5444 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 5445 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 5446 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 5447#ifdef CONFIG_IPV6_ROUTER_PREF
5448 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 5449 array[DEVCONF_RTR_PROBE_INTERVAL] =
5450 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 5451#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 5452 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
09c884d4
YH		 5453 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5454#endif
930d6ff2 5455#endif
fbea49e1 5456 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 5457 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 5458#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5459 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 5460 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 5461#endif
7bc570c8 5462#ifdef CONFIG_IPV6_MROUTE
98fa2c07 5463 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding);
7bc570c8 5464#endif
778d80be 5465 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 5466 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 5467 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 5468 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 5469 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 5470 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 5471 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 5472 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 5473 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 5474 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 5475 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 5476 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 5477 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1ababeba 5478 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
bf355b8d
DL		 5479#ifdef CONFIG_IPV6_SEG6_HMAC
5480 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5481#endif
adc176c5 5482 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
d35a00b8 5483 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
df789fe7 5484 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
2210d6b2 5485 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
1da177e4
LT		 5486}
5487
b382b191
TG		 5488static inline size_t inet6_ifla6_size(void)
5489{
5490 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5491 + nla_total_size(sizeof(struct ifla_cacheinfo))
5492 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5493 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4 5494 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
bdd72f41
SD		 5495 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5496 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5497 + 0;
b382b191
TG		 5498}
5499
339bf98f
TG		 5500static inline size_t inet6_if_nlmsg_size(void)
5501{
5502 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5503 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5504 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5505 + nla_total_size(4) /* IFLA_MTU */
5506 + nla_total_size(4) /* IFLA_LINK */
0344338b 5507 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 5508 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 5509}
c5396a31 5510
be281e55 5511static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
aca05671 5512 int bytes)
7f7d9a6b
HX		 5513{
5514 int i;
aca05671 5515 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
7f7d9a6b
HX		 5516 BUG_ON(pad < 0);
5517
5518 /* Use put_unaligned() because stats may not be aligned for u64. */
aca05671
JH		 5519 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5520 for (i = 1; i < ICMP6_MIB_MAX; i++)
be281e55 5521 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b 5522
aca05671 5523 memset(&stats[ICMP6_MIB_MAX], 0, pad);
7f7d9a6b
HX		 5524}
5525
698365fa 5526static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 5527 int bytes, size_t syncpoff)
4ce3c183 5528{
a3a77372
R		 5529 int i, c;
5530 u64 buff[IPSTATS_MIB_MAX];
5531 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5532
4ce3c183
ED		 5533 BUG_ON(pad < 0);
5534
a3a77372
R		 5535 memset(buff, 0, sizeof(buff));
5536 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 5537
a3a77372
R		 5538 for_each_possible_cpu(c) {
5539 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5540 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5541 }
5542
5543 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5544 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 5545}
5546
7f7d9a6b
HX		 5547static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5548 int bytes)
5549{
e21e8467 5550 switch (attrtype) {
7f7d9a6b 5551 case IFLA_INET6_STATS:
a3a77372
R		 5552 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5553 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 5554 break;
5555 case IFLA_INET6_ICMP6STATS:
aca05671 5556 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
7f7d9a6b
HX		 5557 break;
5558 }
5559}
5560
d5566fd7
SV		 5561static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5562 u32 ext_filter_mask)
b382b191
TG		 5563{
5564 struct nlattr *nla;
5565 struct ifla_cacheinfo ci;
5566
c78679e8
DM		 5567 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5568 goto nla_put_failure;
b382b191 5569 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 5570 ci.tstamp = cstamp_delta(idev->tstamp);
5571 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 5572 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 5573 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5574 goto nla_put_failure;
b382b191 5575 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 5576 if (!nla)
b382b191
TG		 5577 goto nla_put_failure;
5578 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5579
5580 /* XXX - MC not implemented */
5581
d5566fd7
SV		 5582 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5583 return 0;
5584
b382b191 5585 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 5586 if (!nla)
b382b191
TG		 5587 goto nla_put_failure;
5588 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5589
5590 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 5591 if (!nla)
b382b191
TG		 5592 goto nla_put_failure;
5593 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5594
f53adae4 5595 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 5596 if (!nla)
f53adae4 5597 goto nla_put_failure;
bc91b0f0 5598
d35a00b8 5599 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
bc91b0f0
JP		 5600 goto nla_put_failure;
5601
f53adae4
DB		 5602 read_lock_bh(&idev->lock);
5603 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5604 read_unlock_bh(&idev->lock);
5605
b382b191
TG		 5606 return 0;
5607
5608nla_put_failure:
5609 return -EMSGSIZE;
5610}
5611
b1974ed0
AR		 5612static size_t inet6_get_link_af_size(const struct net_device *dev,
5613 u32 ext_filter_mask)
b382b191
TG		 5614{
5615 if (!__in6_dev_get(dev))
5616 return 0;
5617
5618 return inet6_ifla6_size();
5619}
5620
d5566fd7
SV		 5621static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5622 u32 ext_filter_mask)
b382b191
TG		 5623{
5624 struct inet6_dev *idev = __in6_dev_get(dev);
5625
5626 if (!idev)
5627 return -ENODATA;
5628
d5566fd7 5629 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5630 return -EMSGSIZE;
5631
5632 return 0;
5633}
5634
f53adae4
DB		 5635static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5636{
f53adae4
DB		 5637 struct inet6_ifaddr *ifp;
5638 struct net_device *dev = idev->dev;
47e27d5e 5639 bool clear_token, update_rs = false;
dc848292 5640 struct in6_addr ll_addr;
f53adae4 5641
c15b1cca
HFS		 5642 ASSERT_RTNL();
5643
63159f29 5644 if (!token)
f53adae4 5645 return -EINVAL;
f53adae4
DB		 5646 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5647 return -EINVAL;
f53adae4
DB		 5648 if (!ipv6_accept_ra(idev))
5649 return -EINVAL;
bd11f074 5650 if (idev->cnf.rtr_solicits == 0)
f53adae4
DB		 5651 return -EINVAL;
5652
5653 write_lock_bh(&idev->lock);
5654
5655 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5656 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5657
5658 write_unlock_bh(&idev->lock);
5659
47e27d5e
DB		 5660 clear_token = ipv6_addr_any(token);
5661 if (clear_token)
5662 goto update_lft;
5663
dc848292
HFS		 5664 if (!idev->dead && (idev->if_flags & IF_READY) &&
5665 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5666 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5667 /* If we're not ready, then normal ifup will take care
5668 * of this. Otherwise, we need to request our rs here.
5669 */
5670 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5671 update_rs = true;
5672 }
f53adae4 5673
47e27d5e 5674update_lft:
f53adae4 5675 write_lock_bh(&idev->lock);
fc403832 5676
77ecaace 5677 if (update_rs) {
fc403832 5678 idev->if_flags |= IF_RS_SENT;
bd11f074
MŻ		 5679 idev->rs_interval = rfc3315_s14_backoff_init(
5680 idev->cnf.rtr_solicit_interval);
77ecaace 5681 idev->rs_probes = 1;
bd11f074 5682 addrconf_mod_rs_timer(idev, idev->rs_interval);
77ecaace 5683 }
f53adae4
DB		 5684
5685 /* Well, that's kinda nasty ... */
5686 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5687 spin_lock(&ifp->lock);
617fe29d 5688 if (ifp->tokenized) {
f53adae4
DB		 5689 ifp->valid_lft = 0;
5690 ifp->prefered_lft = 0;
5691 }
5692 spin_unlock(&ifp->lock);
5693 }
5694
5695 write_unlock_bh(&idev->lock);
b2ed64a9 5696 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 5697 addrconf_verify_rtnl();
f53adae4
DB		 5698 return 0;
5699}
5700
11b1f828
DB		 5701static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5702 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5703 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5704};
5705
d35a00b8
FJ		 5706static int check_addr_gen_mode(int mode)
5707{
5708 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5709 mode != IN6_ADDR_GEN_MODE_NONE &&
5710 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5711 mode != IN6_ADDR_GEN_MODE_RANDOM)
5712 return -EINVAL;
5713 return 1;
5714}
5715
5716static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5717 int mode)
5718{
5719 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5720 !idev->cnf.stable_secret.initialized &&
5721 !net->ipv6.devconf_dflt->stable_secret.initialized)
5722 return -EINVAL;
5723 return 1;
5724}
5725
7dc2bcca
MM		 5726static int inet6_validate_link_af(const struct net_device *dev,
5727 const struct nlattr *nla)
5728{
5729 struct nlattr *tb[IFLA_INET6_MAX + 1];
5730 struct inet6_dev *idev = NULL;
5731 int err;
5732
5733 if (dev) {
5734 idev = __in6_dev_get(dev);
5735 if (!idev)
5736 return -EAFNOSUPPORT;
5737 }
5738
5739 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5740 inet6_af_policy, NULL);
5741 if (err)
5742 return err;
5743
5744 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5745 return -EINVAL;
5746
5747 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5748 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5749
5750 if (check_addr_gen_mode(mode) < 0)
5751 return -EINVAL;
5752 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5753 return -EINVAL;
5754 }
5755
5756 return 0;
5757}
5758
f53adae4
DB		 5759static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5760{
f53adae4
DB		 5761 struct inet6_dev *idev = __in6_dev_get(dev);
5762 struct nlattr *tb[IFLA_INET6_MAX + 1];
7dc2bcca 5763 int err;
f53adae4 5764
7638fe81
ED		 5765 if (!idev)
5766 return -EAFNOSUPPORT;
5767
8cb08174 5768 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
733cfa05 5769 return -EINVAL;
f53adae4 5770
bc91b0f0 5771 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 5772 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 5773 if (err)
5774 return err;
5775 }
5776
5777 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5778 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5779
d35a00b8 5780 idev->cnf.addr_gen_mode = mode;
bc91b0f0 5781 }
f53adae4 5782
7dc2bcca 5783 return 0;
f53adae4
DB		 5784}
5785
1ab1457c 5786static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5787 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5788{
04561c1f 5789 struct net_device *dev = idev->dev;
04561c1f
TG		 5790 struct ifinfomsg *hdr;
5791 struct nlmsghdr *nlh;
5792 void *protoinfo;
04561c1f 5793
15e47304 5794 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5795 if (!nlh)
26932566 5796 return -EMSGSIZE;
04561c1f
TG		 5797
5798 hdr = nlmsg_data(nlh);
5799 hdr->ifi_family = AF_INET6;
5800 hdr->__ifi_pad = 0;
5801 hdr->ifi_type = dev->type;
5802 hdr->ifi_index = dev->ifindex;
5803 hdr->ifi_flags = dev_get_flags(dev);
5804 hdr->ifi_change = 0;
5805
c78679e8
DM		 5806 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5807 (dev->addr_len &&
5808 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5809 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5810 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5811 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5812 nla_put_u8(skb, IFLA_OPERSTATE,
5813 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5814 goto nla_put_failure;
ae0be8de 5815 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
63159f29 5816 if (!protoinfo)
04561c1f 5817 goto nla_put_failure;
1da177e4 5818
d5566fd7 5819 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5820 goto nla_put_failure;
1da177e4 5821
04561c1f 5822 nla_nest_end(skb, protoinfo);
053c095a
JB		 5823 nlmsg_end(skb, nlh);
5824 return 0;
1da177e4 5825
04561c1f 5826nla_put_failure:
26932566
PM		 5827 nlmsg_cancel(skb, nlh);
5828 return -EMSGSIZE;
1da177e4
LT		 5829}
5830
786e0007
DA		 5831static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5832 struct netlink_ext_ack *extack)
5833{
5834 struct ifinfomsg *ifm;
5835
5836 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5837 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5838 return -EINVAL;
5839 }
5840
5841 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5842 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5843 return -EINVAL;
5844 }
5845
5846 ifm = nlmsg_data(nlh);
5847 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5848 ifm->ifi_change || ifm->ifi_index) {
5849 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5850 return -EINVAL;
5851 }
5852
5853 return 0;
5854}
5855
1da177e4
LT		 5856static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5857{
3b1e0a65 5858 struct net *net = sock_net(skb->sk);
84d2697d 5859 int h, s_h;
434a8a58 5860 int idx = 0, s_idx;
1da177e4
LT		 5861 struct net_device *dev;
5862 struct inet6_dev *idev;
84d2697d 5863 struct hlist_head *head;
1da177e4 5864
786e0007
DA		 5865 /* only requests using strict checking can pass data to
5866 * influence the dump
5867 */
5868 if (cb->strict_check) {
5869 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
5870
5871 if (err < 0)
5872 return err;
5873 }
5874
84d2697d
ED		 5875 s_h = cb->args[0];
5876 s_idx = cb->args[1];
5877
5878 rcu_read_lock();
5879 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5880 idx = 0;
5881 head = &net->dev_index_head[h];
b67bfe0d 5882 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5883 if (idx < s_idx)
5884 goto cont;
5885 idev = __in6_dev_get(dev);
5886 if (!idev)
5887 goto cont;
5888 if (inet6_fill_ifinfo(skb, idev,
15e47304 5889 NETLINK_CB(cb->skb).portid,
84d2697d 5890 cb->nlh->nlmsg_seq,
053c095a 5891 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5892 goto out;
7562f876 5893cont:
84d2697d
ED		 5894 idx++;
5895 }
1da177e4 5896 }
84d2697d
ED		 5897out:
5898 rcu_read_unlock();
5899 cb->args[1] = idx;
5900 cb->args[0] = h;
1da177e4
LT		 5901
5902 return skb->len;
5903}
5904
5905void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5906{
5907 struct sk_buff *skb;
c346dca1 5908 struct net *net = dev_net(idev->dev);
8d7a76c9 5909 int err = -ENOBUFS;
1ab1457c 5910
339bf98f 5911 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5912 if (!skb)
8d7a76c9
TG		 5913 goto errout;
5914
5915 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5916 if (err < 0) {
5917 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5918 WARN_ON(err == -EMSGSIZE);
5919 kfree_skb(skb);
5920 goto errout;
5921 }
5f75a104 5922 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5923 return;
8d7a76c9
TG		 5924errout:
5925 if (err < 0)
5f75a104 5926 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5927}
5928
339bf98f
TG		 5929static inline size_t inet6_prefix_nlmsg_size(void)
5930{
5931 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5932 + nla_total_size(sizeof(struct in6_addr))
5933 + nla_total_size(sizeof(struct prefix_cacheinfo));
5934}
c5396a31 5935
1da177e4 5936static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5937 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5938 int event, unsigned int flags)
1da177e4 5939{
6051e2f4
TG		 5940 struct prefixmsg *pmsg;
5941 struct nlmsghdr *nlh;
1da177e4
LT		 5942 struct prefix_cacheinfo ci;
5943
15e47304 5944 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5945 if (!nlh)
26932566 5946 return -EMSGSIZE;
6051e2f4
TG		 5947
5948 pmsg = nlmsg_data(nlh);
1da177e4 5949 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5950 pmsg->prefix_pad1 = 0;
5951 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5952 pmsg->prefix_ifindex = idev->dev->ifindex;
5953 pmsg->prefix_len = pinfo->prefix_len;
5954 pmsg->prefix_type = pinfo->type;
8a47077a 5955 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5956 pmsg->prefix_flags = 0;
5957 if (pinfo->onlink)
5958 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5959 if (pinfo->autoconf)
5960 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5961
c78679e8
DM		 5962 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5963 goto nla_put_failure;
1da177e4
LT		 5964 ci.preferred_time = ntohl(pinfo->prefered);
5965 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5966 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5967 goto nla_put_failure;
053c095a
JB		 5968 nlmsg_end(skb, nlh);
5969 return 0;
1da177e4 5970
6051e2f4 5971nla_put_failure:
26932566
PM		 5972 nlmsg_cancel(skb, nlh);
5973 return -EMSGSIZE;
1da177e4
LT		 5974}
5975
1ab1457c 5976static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5977 struct prefix_info *pinfo)
5978{
5979 struct sk_buff *skb;
c346dca1 5980 struct net *net = dev_net(idev->dev);
8c384bfa 5981 int err = -ENOBUFS;
1da177e4 5982
339bf98f 5983 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5984 if (!skb)
8c384bfa
TG		 5985 goto errout;
5986
5987 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5988 if (err < 0) {
5989 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5990 WARN_ON(err == -EMSGSIZE);
5991 kfree_skb(skb);
5992 goto errout;
5993 }
1ce85fe4
PNA		 5994 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5995 return;
8c384bfa
TG		 5996errout:
5997 if (err < 0)
6fda7350 5998 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5999}
6000
1da177e4
LT		 6001static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6002{
63998ac2
ND		 6003 struct net *net = dev_net(ifp->idev->dev);
6004
c15b1cca
HFS		 6005 if (event)
6006 ASSERT_RTNL();
6007
1da177e4
LT		 6008 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6009
6010 switch (event) {
6011 case RTM_NEWADDR:
95c385b4 6012 /*
2d819d25
DA		 6013 * If the address was optimistic we inserted the route at the
6014 * start of our DAD process, so we don't need to do it again.
6015 * If the device was taken down in the middle of the DAD
6016 * cycle there is a race where we could get here without a
6017 * host route, so nothing to insert. That will be fixed when
6018 * the device is brought up.
95c385b4 6019 */
2d819d25 6020 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
afb1d4b5 6021 ip6_ins_rt(net, ifp->rt);
2d819d25
DA		 6022 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6023 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6024 &ifp->addr, ifp->idev->dev->name);
6025 }
6026
1da177e4
LT		 6027 if (ifp->idev->cnf.forwarding)
6028 addrconf_join_anycast(ifp);
7996c799 6029 if (!ipv6_addr_any(&ifp->peer_addr))
7d877fb0
HL		 6030 addrconf_prefix_route(&ifp->peer_addr, 128,
6031 ifp->rt_priority, ifp->idev->dev,
6032 0, 0, GFP_ATOMIC);
1da177e4
LT		 6033 break;
6034 case RTM_DELADDR:
6035 if (ifp->idev->cnf.forwarding)
6036 addrconf_leave_anycast(ifp);
6037 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 6038 if (!ipv6_addr_any(&ifp->peer_addr)) {
8d1c802b 6039 struct fib6_info *rt;
caeaba79 6040
e7478dfc 6041 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
2b2450ca
DA		 6042 ifp->idev->dev, 0, 0,
6043 false);
8e3d5be7 6044 if (rt)
afb1d4b5 6045 ip6_del_rt(net, rt);
caeaba79 6046 }
38bd10c4 6047 if (ifp->rt) {
93531c67
DA		 6048 ip6_del_rt(net, ifp->rt);
6049 ifp->rt = NULL;
38bd10c4 6050 }
705f1c86 6051 rt_genid_bump_ipv6(net);
1da177e4
LT		 6052 break;
6053 }
63998ac2 6054 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 6055}
6056
6057static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6058{
8814c4b5 6059 rcu_read_lock_bh();
1da177e4
LT		 6060 if (likely(ifp->idev->dead == 0))
6061 __ipv6_ifa_notify(event, ifp);
8814c4b5 6062 rcu_read_unlock_bh();
1da177e4
LT		 6063}
6064
6065#ifdef CONFIG_SYSCTL
6066
6067static
fe2c6338 6068int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 6069 void __user *buffer, size_t *lenp, loff_t *ppos)
6070{
6071 int *valp = ctl->data;
6072 int val = *valp;
88af182e 6073 loff_t pos = *ppos;
fe2c6338 6074 struct ctl_table lctl;
1da177e4
LT		 6075 int ret;
6076
013d97e9
FR		 6077 /*
6078 * ctl->data points to idev->cnf.forwarding, we should
6079 * not modify it until we get the rtnl lock.
6080 */
6081 lctl = *ctl;
6082 lctl.data = &val;
6083
6084 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 6085
c8fecf22 6086 if (write)
b325fddb 6087 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 6088 if (ret)
6089 *ppos = pos;
1ab1457c 6090 return ret;
1da177e4
LT		 6091}
6092
77751427
ML		 6093static
6094int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6095 void __user *buffer, size_t *lenp, loff_t *ppos)
6096{
6097 struct inet6_dev *idev = ctl->extra1;
6098 int min_mtu = IPV6_MIN_MTU;
6099 struct ctl_table lctl;
6100
6101 lctl = *ctl;
6102 lctl.extra1 = &min_mtu;
6103 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6104
6105 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6106}
6107
56d417b1
BH		 6108static void dev_disable_change(struct inet6_dev *idev)
6109{
75538c2b
CW		 6110 struct netdev_notifier_info info;
6111
56d417b1
BH		 6112 if (!idev || !idev->dev)
6113 return;
6114
75538c2b 6115 netdev_notifier_info_init(&info, idev->dev);
56d417b1 6116 if (idev->cnf.disable_ipv6)
75538c2b 6117 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 6118 else
75538c2b 6119 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 6120}
6121
6122static void addrconf_disable_change(struct net *net, __s32 newf)
6123{
6124 struct net_device *dev;
6125 struct inet6_dev *idev;
6126
03e4deff 6127 for_each_netdev(net, dev) {
56d417b1
BH		 6128 idev = __in6_dev_get(dev);
6129 if (idev) {
6130 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6131 idev->cnf.disable_ipv6 = newf;
6132 if (changed)
6133 dev_disable_change(idev);
6134 }
56d417b1 6135 }
56d417b1
BH		 6136}
6137
013d97e9 6138static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 6139{
6140 struct net *net;
013d97e9
FR		 6141 int old;
6142
6143 if (!rtnl_trylock())
6144 return restart_syscall();
56d417b1
BH		 6145
6146 net = (struct net *)table->extra2;
013d97e9
FR		 6147 old = *p;
6148 *p = newf;
56d417b1 6149
013d97e9
FR		 6150 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6151 rtnl_unlock();
56d417b1 6152 return 0;
88af182e 6153 }
56d417b1
BH		 6154
6155 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 6156 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6157 addrconf_disable_change(net, newf);
013d97e9 6158 } else if ((!newf) ^ (!old))
56d417b1
BH		 6159 dev_disable_change((struct inet6_dev *)table->extra1);
6160
6161 rtnl_unlock();
6162 return 0;
6163}
6164
6165static
fe2c6338 6166int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 6167 void __user *buffer, size_t *lenp, loff_t *ppos)
6168{
6169 int *valp = ctl->data;
6170 int val = *valp;
88af182e 6171 loff_t pos = *ppos;
fe2c6338 6172 struct ctl_table lctl;
56d417b1
BH		 6173 int ret;
6174
013d97e9
FR		 6175 /*
6176 * ctl->data points to idev->cnf.disable_ipv6, we should
6177 * not modify it until we get the rtnl lock.
6178 */
6179 lctl = *ctl;
6180 lctl.data = &val;
6181
6182 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 6183
6184 if (write)
6185 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 6186 if (ret)
6187 *ppos = pos;
56d417b1
BH		 6188 return ret;
6189}
6190
c92d5491 6191static
6192int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6193 void __user *buffer, size_t *lenp, loff_t *ppos)
6194{
6195 int *valp = ctl->data;
6196 int ret;
6197 int old, new;
6198
6199 old = *valp;
6200 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6201 new = *valp;
6202
6203 if (write && old != new) {
6204 struct net *net = ctl->extra2;
6205
6206 if (!rtnl_trylock())
6207 return restart_syscall();
6208
6209 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
85b3daad
DA		 6210 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6211 NETCONFA_PROXY_NEIGH,
c92d5491 6212 NETCONFA_IFINDEX_DEFAULT,
6213 net->ipv6.devconf_dflt);
6214 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
85b3daad
DA		 6215 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6216 NETCONFA_PROXY_NEIGH,
c92d5491 6217 NETCONFA_IFINDEX_ALL,
6218 net->ipv6.devconf_all);
6219 else {
6220 struct inet6_dev *idev = ctl->extra1;
6221
85b3daad
DA		 6222 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6223 NETCONFA_PROXY_NEIGH,
c92d5491 6224 idev->dev->ifindex,
6225 &idev->cnf);
6226 }
6227 rtnl_unlock();
6228 }
6229
6230 return ret;
6231}
6232
d35a00b8
FJ		 6233static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6234 void __user *buffer, size_t *lenp,
6235 loff_t *ppos)
6236{
6237 int ret = 0;
c6dbf7aa 6238 u32 new_val;
d35a00b8
FJ		 6239 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6240 struct net *net = (struct net *)ctl->extra2;
c6dbf7aa
SD		 6241 struct ctl_table tmp = {
6242 .data = &new_val,
6243 .maxlen = sizeof(new_val),
6244 .mode = ctl->mode,
6245 };
d35a00b8 6246
8c171d6c
FJ		 6247 if (!rtnl_trylock())
6248 return restart_syscall();
6249
c6dbf7aa 6250 new_val = *((u32 *)ctl->data);
d35a00b8 6251
c6dbf7aa
SD		 6252 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6253 if (ret != 0)
6254 goto out;
d35a00b8 6255
c6dbf7aa 6256 if (write) {
8c171d6c
FJ		 6257 if (check_addr_gen_mode(new_val) < 0) {
6258 ret = -EINVAL;
6259 goto out;
6260 }
d35a00b8 6261
c6dbf7aa 6262 if (idev) {
8c171d6c
FJ		 6263 if (check_stable_privacy(idev, net, new_val) < 0) {
6264 ret = -EINVAL;
6265 goto out;
6266 }
d35a00b8
FJ		 6267
6268 if (idev->cnf.addr_gen_mode != new_val) {
6269 idev->cnf.addr_gen_mode = new_val;
d35a00b8 6270 addrconf_dev_config(idev->dev);
d35a00b8 6271 }
f24c5987
SD		 6272 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6273 struct net_device *dev;
6274
6275 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6276 for_each_netdev(net, dev) {
6277 idev = __in6_dev_get(dev);
6278 if (idev &&
6279 idev->cnf.addr_gen_mode != new_val) {
6280 idev->cnf.addr_gen_mode = new_val;
6281 addrconf_dev_config(idev->dev);
6282 }
6283 }
d35a00b8 6284 }
c6dbf7aa
SD		 6285
6286 *((u32 *)ctl->data) = new_val;
d35a00b8
FJ		 6287 }
6288
8c171d6c
FJ		 6289out:
6290 rtnl_unlock();
6291
d35a00b8
FJ		 6292 return ret;
6293}
6294
3d1bec99
HFS		 6295static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6296 void __user *buffer, size_t *lenp,
6297 loff_t *ppos)
6298{
6299 int err;
6300 struct in6_addr addr;
6301 char str[IPV6_MAX_STRLEN];
6302 struct ctl_table lctl = *ctl;
622c81d5 6303 struct net *net = ctl->extra2;
3d1bec99
HFS		 6304 struct ipv6_stable_secret *secret = ctl->data;
6305
622c81d5
HFS		 6306 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6307 return -EIO;
6308
3d1bec99
HFS		 6309 lctl.maxlen = IPV6_MAX_STRLEN;
6310 lctl.data = str;
6311
6312 if (!rtnl_trylock())
6313 return restart_syscall();
6314
6315 if (!write && !secret->initialized) {
6316 err = -EIO;
6317 goto out;
6318 }
6319
5449a5ca
WC		 6320 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6321 if (err >= sizeof(str)) {
6322 err = -EIO;
6323 goto out;
3d1bec99
HFS		 6324 }
6325
6326 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6327 if (err || !write)
6328 goto out;
6329
6330 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6331 err = -EIO;
6332 goto out;
6333 }
6334
6335 secret->initialized = true;
6336 secret->secret = addr;
6337
622c81d5
HFS		 6338 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6339 struct net_device *dev;
6340
6341 for_each_netdev(net, dev) {
6342 struct inet6_dev *idev = __in6_dev_get(dev);
6343
6344 if (idev) {
d35a00b8 6345 idev->cnf.addr_gen_mode =
622c81d5
HFS		 6346 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6347 }
6348 }
6349 } else {
6350 struct inet6_dev *idev = ctl->extra1;
6351
d35a00b8 6352 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
622c81d5
HFS		 6353 }
6354
3d1bec99
HFS		 6355out:
6356 rtnl_unlock();
6357
6358 return err;
6359}
c92d5491 6360
35103d11
AG		 6361static
6362int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6363 int write,
6364 void __user *buffer,
6365 size_t *lenp,
6366 loff_t *ppos)
6367{
6368 int *valp = ctl->data;
6369 int val = *valp;
6370 loff_t pos = *ppos;
6371 struct ctl_table lctl;
6372 int ret;
6373
6374 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6375 * we should not modify it until we get the rtnl lock.
6376 */
6377 lctl = *ctl;
6378 lctl.data = &val;
6379
6380 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6381
6382 if (write)
6383 ret = addrconf_fixup_linkdown(ctl, valp, val);
6384 if (ret)
6385 *ppos = pos;
6386 return ret;
6387}
6388
df789fe7
DF		 6389static
6390void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6391{
6392 if (rt) {
6393 if (action)
6394 rt->dst.flags |= DST_NOPOLICY;
6395 else
6396 rt->dst.flags &= ~DST_NOPOLICY;
6397 }
6398}
6399
6400static
6401void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6402{
6403 struct inet6_ifaddr *ifa;
6404
6405 read_lock_bh(&idev->lock);
6406 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6407 spin_lock(&ifa->lock);
6408 if (ifa->rt) {
f88d8ea6 6409 /* host routes only use builtin fib6_nh */
1cf844c7 6410 struct fib6_nh *nh = ifa->rt->fib6_nh;
df789fe7
DF		 6411 int cpu;
6412
66f5d6ce 6413 rcu_read_lock();
3b6761d1 6414 ifa->rt->dst_nopolicy = val ? true : false;
f40b6ae2 6415 if (nh->rt6i_pcpu) {
df789fe7
DF		 6416 for_each_possible_cpu(cpu) {
6417 struct rt6_info **rtp;
6418
f40b6ae2 6419 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
df789fe7
DF		 6420 addrconf_set_nopolicy(*rtp, val);
6421 }
6422 }
66f5d6ce 6423 rcu_read_unlock();
df789fe7
DF		 6424 }
6425 spin_unlock(&ifa->lock);
6426 }
6427 read_unlock_bh(&idev->lock);
6428}
6429
6430static
6431int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6432{
6433 struct inet6_dev *idev;
6434 struct net *net;
6435
6436 if (!rtnl_trylock())
6437 return restart_syscall();
6438
6439 *valp = val;
6440
6441 net = (struct net *)ctl->extra2;
6442 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6443 rtnl_unlock();
6444 return 0;
6445 }
6446
6447 if (valp == &net->ipv6.devconf_all->disable_policy) {
6448 struct net_device *dev;
6449
6450 for_each_netdev(net, dev) {
6451 idev = __in6_dev_get(dev);
6452 if (idev)
6453 addrconf_disable_policy_idev(idev, val);
6454 }
6455 } else {
6456 idev = (struct inet6_dev *)ctl->extra1;
6457 addrconf_disable_policy_idev(idev, val);
6458 }
6459
6460 rtnl_unlock();
6461 return 0;
6462}
6463
6464static
6465int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6466 void __user *buffer, size_t *lenp,
6467 loff_t *ppos)
6468{
6469 int *valp = ctl->data;
6470 int val = *valp;
6471 loff_t pos = *ppos;
6472 struct ctl_table lctl;
6473 int ret;
6474
6475 lctl = *ctl;
6476 lctl.data = &val;
6477 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6478
6479 if (write && (*valp != val))
6480 ret = addrconf_disable_policy(ctl, valp, val);
6481
6482 if (ret)
6483 *ppos = pos;
6484
6485 return ret;
6486}
6487
cb4a4c69 6488static int minus_one = -1;
cb9e684e
MŻ		 6489static const int two_five_five = 255;
6490
607ea7cd 6491static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 6492 {
6493 .procname = "forwarding",
6494 .data = &ipv6_devconf.forwarding,
6495 .maxlen = sizeof(int),
6496 .mode = 0644,
6497 .proc_handler = addrconf_sysctl_forward,
6498 },
6499 {
6500 .procname = "hop_limit",
6501 .data = &ipv6_devconf.hop_limit,
6502 .maxlen = sizeof(int),
6503 .mode = 0644,
cb9e684e 6504 .proc_handler = proc_dointvec_minmax,
eec4844f 6505 .extra1 = (void *)SYSCTL_ONE,
cb9e684e 6506 .extra2 = (void *)&two_five_five,
5df1f77f
KK		 6507 },
6508 {
6509 .procname = "mtu",
6510 .data = &ipv6_devconf.mtu6,
6511 .maxlen = sizeof(int),
6512 .mode = 0644,
6513 .proc_handler = addrconf_sysctl_mtu,
6514 },
6515 {
6516 .procname = "accept_ra",
6517 .data = &ipv6_devconf.accept_ra,
6518 .maxlen = sizeof(int),
6519 .mode = 0644,
6520 .proc_handler = proc_dointvec,
6521 },
6522 {
6523 .procname = "accept_redirects",
6524 .data = &ipv6_devconf.accept_redirects,
6525 .maxlen = sizeof(int),
6526 .mode = 0644,
6527 .proc_handler = proc_dointvec,
6528 },
6529 {
6530 .procname = "autoconf",
6531 .data = &ipv6_devconf.autoconf,
6532 .maxlen = sizeof(int),
6533 .mode = 0644,
6534 .proc_handler = proc_dointvec,
6535 },
6536 {
6537 .procname = "dad_transmits",
6538 .data = &ipv6_devconf.dad_transmits,
6539 .maxlen = sizeof(int),
6540 .mode = 0644,
6541 .proc_handler = proc_dointvec,
6542 },
6543 {
6544 .procname = "router_solicitations",
6545 .data = &ipv6_devconf.rtr_solicits,
6546 .maxlen = sizeof(int),
6547 .mode = 0644,
cb4a4c69
MŻ		 6548 .proc_handler = proc_dointvec_minmax,
6549 .extra1 = &minus_one,
5df1f77f
KK		 6550 },
6551 {
6552 .procname = "router_solicitation_interval",
6553 .data = &ipv6_devconf.rtr_solicit_interval,
6554 .maxlen = sizeof(int),
6555 .mode = 0644,
6556 .proc_handler = proc_dointvec_jiffies,
6557 },
bd11f074
MŻ		 6558 {
6559 .procname = "router_solicitation_max_interval",
6560 .data = &ipv6_devconf.rtr_solicit_max_interval,
6561 .maxlen = sizeof(int),
6562 .mode = 0644,
6563 .proc_handler = proc_dointvec_jiffies,
6564 },
5df1f77f
KK		 6565 {
6566 .procname = "router_solicitation_delay",
6567 .data = &ipv6_devconf.rtr_solicit_delay,
6568 .maxlen = sizeof(int),
6569 .mode = 0644,
6570 .proc_handler = proc_dointvec_jiffies,
6571 },
6572 {
6573 .procname = "force_mld_version",
6574 .data = &ipv6_devconf.force_mld_version,
6575 .maxlen = sizeof(int),
6576 .mode = 0644,
6577 .proc_handler = proc_dointvec,
6578 },
6579 {
6580 .procname = "mldv1_unsolicited_report_interval",
6581 .data =
6582 &ipv6_devconf.mldv1_unsolicited_report_interval,
6583 .maxlen = sizeof(int),
6584 .mode = 0644,
6585 .proc_handler = proc_dointvec_ms_jiffies,
6586 },
6587 {
6588 .procname = "mldv2_unsolicited_report_interval",
6589 .data =
6590 &ipv6_devconf.mldv2_unsolicited_report_interval,
6591 .maxlen = sizeof(int),
6592 .mode = 0644,
6593 .proc_handler = proc_dointvec_ms_jiffies,
6594 },
6595 {
6596 .procname = "use_tempaddr",
6597 .data = &ipv6_devconf.use_tempaddr,
6598 .maxlen = sizeof(int),
6599 .mode = 0644,
6600 .proc_handler = proc_dointvec,
6601 },
6602 {
6603 .procname = "temp_valid_lft",
6604 .data = &ipv6_devconf.temp_valid_lft,
6605 .maxlen = sizeof(int),
6606 .mode = 0644,
6607 .proc_handler = proc_dointvec,
6608 },
6609 {
6610 .procname = "temp_prefered_lft",
6611 .data = &ipv6_devconf.temp_prefered_lft,
6612 .maxlen = sizeof(int),
6613 .mode = 0644,
6614 .proc_handler = proc_dointvec,
6615 },
6616 {
6617 .procname = "regen_max_retry",
6618 .data = &ipv6_devconf.regen_max_retry,
6619 .maxlen = sizeof(int),
6620 .mode = 0644,
6621 .proc_handler = proc_dointvec,
6622 },
6623 {
6624 .procname = "max_desync_factor",
6625 .data = &ipv6_devconf.max_desync_factor,
6626 .maxlen = sizeof(int),
6627 .mode = 0644,
6628 .proc_handler = proc_dointvec,
6629 },
6630 {
6631 .procname = "max_addresses",
6632 .data = &ipv6_devconf.max_addresses,
6633 .maxlen = sizeof(int),
6634 .mode = 0644,
6635 .proc_handler = proc_dointvec,
6636 },
6637 {
6638 .procname = "accept_ra_defrtr",
6639 .data = &ipv6_devconf.accept_ra_defrtr,
6640 .maxlen = sizeof(int),
6641 .mode = 0644,
6642 .proc_handler = proc_dointvec,
6643 },
6644 {
6645 .procname = "accept_ra_min_hop_limit",
6646 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6647 .maxlen = sizeof(int),
6648 .mode = 0644,
6649 .proc_handler = proc_dointvec,
6650 },
6651 {
6652 .procname = "accept_ra_pinfo",
6653 .data = &ipv6_devconf.accept_ra_pinfo,
6654 .maxlen = sizeof(int),
6655 .mode = 0644,
6656 .proc_handler = proc_dointvec,
6657 },
930d6ff2 6658#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 6659 {
6660 .procname = "accept_ra_rtr_pref",
6661 .data = &ipv6_devconf.accept_ra_rtr_pref,
6662 .maxlen = sizeof(int),
6663 .mode = 0644,
6664 .proc_handler = proc_dointvec,
6665 },
6666 {
6667 .procname = "router_probe_interval",
6668 .data = &ipv6_devconf.rtr_probe_interval,
6669 .maxlen = sizeof(int),
6670 .mode = 0644,
6671 .proc_handler = proc_dointvec_jiffies,
6672 },
fa03ef38 6673#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b
JS		 6674 {
6675 .procname = "accept_ra_rt_info_min_plen",
6676 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6677 .maxlen = sizeof(int),
6678 .mode = 0644,
6679 .proc_handler = proc_dointvec,
6680 },
5df1f77f
KK		 6681 {
6682 .procname = "accept_ra_rt_info_max_plen",
6683 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6684 .maxlen = sizeof(int),
6685 .mode = 0644,
6686 .proc_handler = proc_dointvec,
6687 },
09c884d4 6688#endif
930d6ff2 6689#endif
5df1f77f
KK		 6690 {
6691 .procname = "proxy_ndp",
6692 .data = &ipv6_devconf.proxy_ndp,
6693 .maxlen = sizeof(int),
6694 .mode = 0644,
6695 .proc_handler = addrconf_sysctl_proxy_ndp,
6696 },
6697 {
6698 .procname = "accept_source_route",
6699 .data = &ipv6_devconf.accept_source_route,
6700 .maxlen = sizeof(int),
6701 .mode = 0644,
6702 .proc_handler = proc_dointvec,
6703 },
95c385b4 6704#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 6705 {
6706 .procname = "optimistic_dad",
6707 .data = &ipv6_devconf.optimistic_dad,
6708 .maxlen = sizeof(int),
6709 .mode = 0644,
6710 .proc_handler = proc_dointvec,
6711 },
6712 {
6713 .procname = "use_optimistic",
6714 .data = &ipv6_devconf.use_optimistic,
6715 .maxlen = sizeof(int),
6716 .mode = 0644,
6717 .proc_handler = proc_dointvec,
6718 },
7bc570c8
YH		 6719#endif
6720#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 6721 {
6722 .procname = "mc_forwarding",
6723 .data = &ipv6_devconf.mc_forwarding,
6724 .maxlen = sizeof(int),
6725 .mode = 0444,
6726 .proc_handler = proc_dointvec,
6727 },
95c385b4 6728#endif
5df1f77f
KK		 6729 {
6730 .procname = "disable_ipv6",
6731 .data = &ipv6_devconf.disable_ipv6,
6732 .maxlen = sizeof(int),
6733 .mode = 0644,
6734 .proc_handler = addrconf_sysctl_disable,
6735 },
6736 {
6737 .procname = "accept_dad",
6738 .data = &ipv6_devconf.accept_dad,
6739 .maxlen = sizeof(int),
6740 .mode = 0644,
6741 .proc_handler = proc_dointvec,
6742 },
6743 {
6744 .procname = "force_tllao",
6745 .data = &ipv6_devconf.force_tllao,
6746 .maxlen = sizeof(int),
6747 .mode = 0644,
6748 .proc_handler = proc_dointvec
6749 },
6750 {
6751 .procname = "ndisc_notify",
6752 .data = &ipv6_devconf.ndisc_notify,
6753 .maxlen = sizeof(int),
6754 .mode = 0644,
6755 .proc_handler = proc_dointvec
6756 },
6757 {
6758 .procname = "suppress_frag_ndisc",
6759 .data = &ipv6_devconf.suppress_frag_ndisc,
6760 .maxlen = sizeof(int),
6761 .mode = 0644,
6762 .proc_handler = proc_dointvec
6763 },
6764 {
6765 .procname = "accept_ra_from_local",
6766 .data = &ipv6_devconf.accept_ra_from_local,
6767 .maxlen = sizeof(int),
6768 .mode = 0644,
6769 .proc_handler = proc_dointvec,
6770 },
6771 {
6772 .procname = "accept_ra_mtu",
6773 .data = &ipv6_devconf.accept_ra_mtu,
6774 .maxlen = sizeof(int),
6775 .mode = 0644,
6776 .proc_handler = proc_dointvec,
6777 },
6778 {
6779 .procname = "stable_secret",
6780 .data = &ipv6_devconf.stable_secret,
6781 .maxlen = IPV6_MAX_STRLEN,
6782 .mode = 0600,
6783 .proc_handler = addrconf_sysctl_stable_secret,
6784 },
6785 {
6786 .procname = "use_oif_addrs_only",
6787 .data = &ipv6_devconf.use_oif_addrs_only,
6788 .maxlen = sizeof(int),
6789 .mode = 0644,
6790 .proc_handler = proc_dointvec,
6791 },
6792 {
6793 .procname = "ignore_routes_with_linkdown",
6794 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6795 .maxlen = sizeof(int),
6796 .mode = 0644,
6797 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6798 },
6799 {
6800 .procname = "drop_unicast_in_l2_multicast",
6801 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6802 .maxlen = sizeof(int),
6803 .mode = 0644,
6804 .proc_handler = proc_dointvec,
6805 },
6806 {
6807 .procname = "drop_unsolicited_na",
6808 .data = &ipv6_devconf.drop_unsolicited_na,
6809 .maxlen = sizeof(int),
6810 .mode = 0644,
6811 .proc_handler = proc_dointvec,
6812 },
6813 {
6814 .procname = "keep_addr_on_down",
6815 .data = &ipv6_devconf.keep_addr_on_down,
6816 .maxlen = sizeof(int),
6817 .mode = 0644,
6818 .proc_handler = proc_dointvec,
6819
6820 },
1ababeba
DL		 6821 {
6822 .procname = "seg6_enabled",
6823 .data = &ipv6_devconf.seg6_enabled,
6824 .maxlen = sizeof(int),
6825 .mode = 0644,
6826 .proc_handler = proc_dointvec,
6827 },
bf355b8d
DL		 6828#ifdef CONFIG_IPV6_SEG6_HMAC
6829 {
6830 .procname = "seg6_require_hmac",
6831 .data = &ipv6_devconf.seg6_require_hmac,
6832 .maxlen = sizeof(int),
6833 .mode = 0644,
6834 .proc_handler = proc_dointvec,
6835 },
6836#endif
adc176c5
EN		 6837 {
6838 .procname = "enhanced_dad",
6839 .data = &ipv6_devconf.enhanced_dad,
6840 .maxlen = sizeof(int),
6841 .mode = 0644,
6842 .proc_handler = proc_dointvec,
6843 },
d35a00b8
FJ		 6844 {
6845 .procname = "addr_gen_mode",
6846 .data = &ipv6_devconf.addr_gen_mode,
6847 .maxlen = sizeof(int),
6848 .mode = 0644,
6849 .proc_handler = addrconf_sysctl_addr_gen_mode,
6850 },
df789fe7
DF		 6851 {
6852 .procname = "disable_policy",
6853 .data = &ipv6_devconf.disable_policy,
6854 .maxlen = sizeof(int),
6855 .mode = 0644,
6856 .proc_handler = addrconf_sysctl_disable_policy,
6857 },
2210d6b2
MŻ		 6858 {
6859 .procname = "ndisc_tclass",
6860 .data = &ipv6_devconf.ndisc_tclass,
6861 .maxlen = sizeof(int),
6862 .mode = 0644,
6863 .proc_handler = proc_dointvec_minmax,
eec4844f 6864 .extra1 = (void *)SYSCTL_ZERO,
2210d6b2
MŻ		 6865 .extra2 = (void *)&two_five_five,
6866 },
5df1f77f
KK		 6867 {
6868 /* sentinel */
6869 }
1da177e4
LT		 6870};
6871
bff16c2f 6872static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 6873 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4 6874{
29c994e3 6875 int i, ifindex;
607ea7cd 6876 struct ctl_table *table;
6105e293 6877 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 6878
607ea7cd
KK		 6879 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6880 if (!table)
f68635e6
PE		 6881 goto out;
6882
607ea7cd
KK		 6883 for (i = 0; table[i].data; i++) {
6884 table[i].data += (char *)p - (char *)&ipv6_devconf;
cb9e684e
MŻ		 6885 /* If one of these is already set, then it is not safe to
6886 * overwrite either of them: this makes proc_dointvec_minmax
6887 * usable.
6888 */
6889 if (!table[i].extra1 && !table[i].extra2) {
6890 table[i].extra1 = idev; /* embedded; no ref */
6891 table[i].extra2 = net;
6892 }
1da177e4 6893 }
1da177e4 6894
6105e293 6895 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 6896
607ea7cd
KK		 6897 p->sysctl_header = register_net_sysctl(net, path, table);
6898 if (!p->sysctl_header)
6105e293 6899 goto free;
f68635e6 6900
29c994e3
ND		 6901 if (!strcmp(dev_name, "all"))
6902 ifindex = NETCONFA_IFINDEX_ALL;
6903 else if (!strcmp(dev_name, "default"))
6904 ifindex = NETCONFA_IFINDEX_DEFAULT;
6905 else
6906 ifindex = idev->dev->ifindex;
85b3daad
DA		 6907 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6908 ifindex, p);
95897312 6909 return 0;
1da177e4 6910
f68635e6 6911free:
607ea7cd 6912 kfree(table);
f68635e6 6913out:
95897312 6914 return -ENOBUFS;
1da177e4
LT		 6915}
6916
23452170
DA		 6917static void __addrconf_sysctl_unregister(struct net *net,
6918 struct ipv6_devconf *p, int ifindex)
408c4768 6919{
607ea7cd 6920 struct ctl_table *table;
408c4768 6921
607ea7cd 6922 if (!p->sysctl_header)
408c4768
PE		 6923 return;
6924
607ea7cd
KK		 6925 table = p->sysctl_header->ctl_table_arg;
6926 unregister_net_sysctl_table(p->sysctl_header);
6927 p->sysctl_header = NULL;
6928 kfree(table);
23452170
DA		 6929
6930 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
408c4768
PE		 6931}
6932
a317a2f1 6933static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 6934{
a317a2f1
WC		 6935 int err;
6936
6937 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6938 return -EINVAL;
6939
6940 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6941 &ndisc_ifinfo_sysctl_change);
6942 if (err)
6943 return err;
6944 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6945 idev, &idev->cnf);
6946 if (err)
6947 neigh_sysctl_unregister(idev->nd_parms);
6948
6949 return err;
f52295a9
PE		 6950}
6951
408c4768 6952static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 6953{
23452170
DA		 6954 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6955 idev->dev->ifindex);
408c4768 6956 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 6957}
6958
6959
6960#endif
6961
2c8c1e72 6962static int __net_init addrconf_init_net(struct net *net)
e0da5a48 6963{
a79ca223 6964 int err = -ENOMEM;
e0da5a48
PE		 6965 struct ipv6_devconf *all, *dflt;
6966
a79ca223 6967 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 6968 if (!all)
a79ca223 6969 goto err_alloc_all;
e0da5a48 6970
a79ca223 6971 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 6972 if (!dflt)
a79ca223 6973 goto err_alloc_dflt;
e0da5a48 6974
a154d5d8
AB		 6975 if (IS_ENABLED(CONFIG_SYSCTL) &&
6976 sysctl_devconf_inherit_init_net == 1 && !net_eq(net, &init_net)) {
856c395c
CW		 6977 memcpy(all, init_net.ipv6.devconf_all, sizeof(ipv6_devconf));
6978 memcpy(dflt, init_net.ipv6.devconf_dflt, sizeof(ipv6_devconf_dflt));
6979 }
6980
a79ca223
HZ		 6981 /* these will be inherited by all namespaces */
6982 dflt->autoconf = ipv6_defaults.autoconf;
6983 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 6984
3d1bec99
HFS		 6985 dflt->stable_secret.initialized = false;
6986 all->stable_secret.initialized = false;
6987
e0da5a48
PE		 6988 net->ipv6.devconf_all = all;
6989 net->ipv6.devconf_dflt = dflt;
6990
6991#ifdef CONFIG_SYSCTL
f8572d8f 6992 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 6993 if (err < 0)
6994 goto err_reg_all;
6995
f8572d8f 6996 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 6997 if (err < 0)
6998 goto err_reg_dflt;
6999#endif
7000 return 0;
7001
7002#ifdef CONFIG_SYSCTL
7003err_reg_dflt:
23452170 7004 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
e0da5a48
PE		 7005err_reg_all:
7006 kfree(dflt);
7007#endif
7008err_alloc_dflt:
7009 kfree(all);
7010err_alloc_all:
7011 return err;
7012}
7013
2c8c1e72 7014static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 7015{
7016#ifdef CONFIG_SYSCTL
23452170
DA		 7017 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7018 NETCONFA_IFINDEX_DEFAULT);
7019 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7020 NETCONFA_IFINDEX_ALL);
e0da5a48 7021#endif
73cf0e92 7022 kfree(net->ipv6.devconf_dflt);
7023 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 7024}
7025
7026static struct pernet_operations addrconf_ops = {
7027 .init = addrconf_init_net,
7028 .exit = addrconf_exit_net,
7029};
7030
207895fd 7031static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 7032 .family = AF_INET6,
7033 .fill_link_af = inet6_fill_link_af,
7034 .get_link_af_size = inet6_get_link_af_size,
11b1f828 7035 .validate_link_af = inet6_validate_link_af,
f53adae4 7036 .set_link_af = inet6_set_link_af,
b382b191
TG		 7037};
7038
1da177e4
LT		 7039/*
7040 * Init / cleanup code
7041 */
7042
7043int __init addrconf_init(void)
7044{
a317a2f1 7045 struct inet6_dev *idev;
c2e21293 7046 int i, err;
2a8cc6c8 7047
e21e8467
SH		 7048 err = ipv6_addr_label_init();
7049 if (err < 0) {
f3213831
JP		 7050 pr_crit("%s: cannot initialize default policy table: %d\n",
7051 __func__, err);
2cc6d2bf 7052 goto out;
2a8cc6c8 7053 }
1da177e4 7054
2cc6d2bf
NH		 7055 err = register_pernet_subsys(&addrconf_ops);
7056 if (err < 0)
7057 goto out_addrlabel;
e0da5a48 7058
c15b1cca
HFS		 7059 addrconf_wq = create_workqueue("ipv6_addrconf");
7060 if (!addrconf_wq) {
7061 err = -ENOMEM;
7062 goto out_nowq;
7063 }
7064
1da177e4
LT		 7065 /* The addrconf netdev notifier requires that loopback_dev
7066 * has it's ipv6 private information allocated and setup
7067 * before it can bring up and give link-local addresses
7068 * to other devices which are up.
7069 *
7070 * Unfortunately, loopback_dev is not necessarily the first
7071 * entry in the global dev_base list of net devices. In fact,
7072 * it is likely to be the very last entry on that list.
7073 * So this causes the notifier registry below to try and
7074 * give link-local addresses to all devices besides loopback_dev
7075 * first, then loopback_dev, which cases all the non-loopback_dev
7076 * devices to fail to get a link-local address.
7077 *
7078 * So, as a temporary fix, allocate the ipv6 structure for
7079 * loopback_dev first by hand.
7080 * Longer term, all of the dependencies ipv6 has upon the loopback
7081 * device and it being up should be removed.
7082 */
7083 rtnl_lock();
a317a2f1 7084 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 7085 rtnl_unlock();
a317a2f1
WC		 7086 if (IS_ERR(idev)) {
7087 err = PTR_ERR(idev);
e0da5a48 7088 goto errlo;
a317a2f1 7089 }
1da177e4 7090
2f460933
WC		 7091 ip6_route_init_special_entries();
7092
c2e21293 7093 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7094 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
7095
1da177e4
LT		 7096 register_netdevice_notifier(&ipv6_dev_notf);
7097
c15b1cca 7098 addrconf_verify();
c127ea2c 7099
3678a9d8 7100 rtnl_af_register(&inet6_ops);
b382b191 7101
16feebcf
FW		 7102 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7103 NULL, inet6_dump_ifinfo, 0);
c127ea2c
TG		 7104 if (err < 0)
7105 goto errout;
7106
16feebcf
FW		 7107 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7108 inet6_rtm_newaddr, NULL, 0);
7109 if (err < 0)
7110 goto errout;
7111 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7112 inet6_rtm_deladdr, NULL, 0);
7113 if (err < 0)
7114 goto errout;
7115 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7116 inet6_rtm_getaddr, inet6_dump_ifaddr,
7117 RTNL_FLAG_DOIT_UNLOCKED);
7118 if (err < 0)
7119 goto errout;
7120 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7121 NULL, inet6_dump_ifmcaddr, 0);
7122 if (err < 0)
7123 goto errout;
7124 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7125 NULL, inet6_dump_ifacaddr, 0);
7126 if (err < 0)
7127 goto errout;
7128 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7129 inet6_netconf_get_devconf,
7130 inet6_netconf_dump_devconf,
7131 RTNL_FLAG_DOIT_UNLOCKED);
7132 if (err < 0)
7133 goto errout;
a3fde2ad
FW		 7134 err = ipv6_addr_label_rtnl_register();
7135 if (err < 0)
7136 goto errout;
2a8cc6c8 7137
1da177e4 7138 return 0;
c127ea2c 7139errout:
16feebcf 7140 rtnl_unregister_all(PF_INET6);
b382b191 7141 rtnl_af_unregister(&inet6_ops);
c127ea2c 7142 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 7143errlo:
c15b1cca
HFS		 7144 destroy_workqueue(addrconf_wq);
7145out_nowq:
e0da5a48 7146 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 7147out_addrlabel:
7148 ipv6_addr_label_cleanup();
7149out:
c127ea2c 7150 return err;
1da177e4
LT		 7151}
7152
09f7709f 7153void addrconf_cleanup(void)
1da177e4 7154{
176c39af 7155 struct net_device *dev;
1da177e4
LT		 7156 int i;
7157
7158 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 7159 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 7160 ipv6_addr_label_cleanup();
1da177e4 7161
5c45121d 7162 rtnl_af_unregister(&inet6_ops);
1da177e4 7163
5c45121d 7164 rtnl_lock();
b382b191 7165
176c39af
DL		 7166 /* clean dev list */
7167 for_each_netdev(&init_net, dev) {
7168 if (__in6_dev_get(dev) == NULL)
7169 continue;
7170 addrconf_ifdown(dev, 1);
7171 }
7172 addrconf_ifdown(init_net.loopback_dev, 2);
7173
1da177e4
LT		 7174 /*
7175 * Check hash table.
7176 */
5c578aed 7177 spin_lock_bh(&addrconf_hash_lock);
c2e21293 7178 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7179 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 7180 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 7181 cancel_delayed_work(&addr_chk_work);
1da177e4 7182 rtnl_unlock();
c15b1cca
HFS		 7183
7184 destroy_workqueue(addrconf_wq);
1da177e4 7185}
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