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Merge tag 'tegra-for-5.20-arm64-defconfig' of git://git.kernel.org/pub/scm/linux...
[people/ms/linux.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>
9ee11f0f 92#include <linux/ioam6.h>
1da177e4 93
1da177e4 94#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e 95
3d1bec99
HFS		 96#define IPV6_MAX_STRLEN \
97 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
98
18a31e1e
TG		 99static inline u32 cstamp_delta(unsigned long cstamp)
100{
101 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
102}
1da177e4 103
bd11f074
MŻ		 104static inline s32 rfc3315_s14_backoff_init(s32 irt)
105{
106 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
107 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
108 do_div(tmp, 1000000);
109 return (s32)tmp;
110}
111
112static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
113{
114 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
115 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
116 do_div(tmp, 1000000);
117 if ((s32)tmp > mrt) {
118 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
119 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
120 do_div(tmp, 1000000);
121 }
122 return (s32)tmp;
123}
124
1da177e4 125#ifdef CONFIG_SYSCTL
a317a2f1 126static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 127static void addrconf_sysctl_unregister(struct inet6_dev *idev);
128#else
a317a2f1 129static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 130{
a317a2f1 131 return 0;
408c4768
PE		 132}
133
134static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
135{
136}
1da177e4
LT		 137#endif
138
969c5464 139static void ipv6_gen_rnd_iid(struct in6_addr *addr);
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 149
8805d13f
ED		 150static void addrconf_verify(struct net *net);
151static void addrconf_verify_rtnl(struct net *net);
1da177e4 152
c15b1cca 153static struct workqueue_struct *addrconf_wq;
1da177e4
LT		 154
155static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
156static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
157
93d9b7d7
JP		 158static void addrconf_type_change(struct net_device *dev,
159 unsigned long event);
ae79dbf6 160static int addrconf_ifdown(struct net_device *dev, bool unregister);
1da177e4 161
8d1c802b 162static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
21caa662
RK		 163 int plen,
164 const struct net_device *dev,
2b2450ca
DA		 165 u32 flags, u32 noflags,
166 bool no_gw);
21caa662 167
cf22f9a2 168static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 169static void addrconf_dad_work(struct work_struct *w);
c76fe2d9
DA		 170static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
171 bool send_na);
896585d4 172static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
e99e88a9 173static void addrconf_rs_timer(struct timer_list *t);
1da177e4
LT		 174static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
175static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
176
1ab1457c 177static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 178 struct prefix_info *pinfo);
1da177e4 179
888c848e 180static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 181 .forwarding = 0,
182 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
183 .mtu6 = IPV6_MIN_MTU,
184 .accept_ra = 1,
185 .accept_redirects = 1,
186 .autoconf = 1,
187 .force_mld_version = 0,
fc4eba58
HFS		 188 .mldv1_unsolicited_report_interval = 10 * HZ,
189 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 190 .dad_transmits = 1,
191 .rtr_solicits = MAX_RTR_SOLICITATIONS,
192 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 193 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 194 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 195 .use_tempaddr = 0,
1da177e4
LT		 196 .temp_valid_lft = TEMP_VALID_LIFETIME,
197 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
198 .regen_max_retry = REGEN_MAX_RETRY,
199 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 200 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 201 .accept_ra_defrtr = 1,
6b2e04bc 202 .ra_defrtr_metric = IP6_RT_PRIO_USER,
d9333196 203 .accept_ra_from_local = 0,
8013d1d7 204 .accept_ra_min_hop_limit= 1,
c4fd30eb 205 .accept_ra_pinfo = 1,
930d6ff2
YH		 206#ifdef CONFIG_IPV6_ROUTER_PREF
207 .accept_ra_rtr_pref = 1,
52e16356 208 .rtr_probe_interval = 60 * HZ,
09c884d4 209#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 210 .accept_ra_rt_info_min_plen = 0,
09c884d4
YH		 211 .accept_ra_rt_info_max_plen = 0,
212#endif
930d6ff2 213#endif
fbea49e1 214 .proxy_ndp = 0,
0bcbc926 215 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 216 .disable_ipv6 = 0,
09400953 217 .accept_dad = 0,
b800c3b9 218 .suppress_frag_ndisc = 1,
c2943f14 219 .accept_ra_mtu = 1,
3d1bec99
HFS		 220 .stable_secret = {
221 .initialized = false,
3985e8a3
EK		 222 },
223 .use_oif_addrs_only = 0,
35103d11 224 .ignore_routes_with_linkdown = 0,
f1705ec1 225 .keep_addr_on_down = 0,
1ababeba 226 .seg6_enabled = 0,
bf355b8d
DL		 227#ifdef CONFIG_IPV6_SEG6_HMAC
228 .seg6_require_hmac = 0,
229#endif
adc176c5 230 .enhanced_dad = 1,
d35a00b8 231 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
df789fe7 232 .disable_policy = 0,
8610c7c6 233 .rpl_seg_enabled = 0,
9ee11f0f
JI		 234 .ioam6_enabled = 0,
235 .ioam6_id = IOAM6_DEFAULT_IF_ID,
236 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE,
18ac597a 237 .ndisc_evict_nocarrier = 1,
1da177e4
LT		 238};
239
ab32ea5d 240static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 241 .forwarding = 0,
242 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
243 .mtu6 = IPV6_MIN_MTU,
244 .accept_ra = 1,
245 .accept_redirects = 1,
246 .autoconf = 1,
fc4eba58
HFS		 247 .force_mld_version = 0,
248 .mldv1_unsolicited_report_interval = 10 * HZ,
249 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 250 .dad_transmits = 1,
251 .rtr_solicits = MAX_RTR_SOLICITATIONS,
252 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 253 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 254 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 255 .use_tempaddr = 0,
256 .temp_valid_lft = TEMP_VALID_LIFETIME,
257 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
258 .regen_max_retry = REGEN_MAX_RETRY,
259 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 260 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 261 .accept_ra_defrtr = 1,
6b2e04bc 262 .ra_defrtr_metric = IP6_RT_PRIO_USER,
d9333196 263 .accept_ra_from_local = 0,
8013d1d7 264 .accept_ra_min_hop_limit= 1,
c4fd30eb 265 .accept_ra_pinfo = 1,
930d6ff2
YH		 266#ifdef CONFIG_IPV6_ROUTER_PREF
267 .accept_ra_rtr_pref = 1,
52e16356 268 .rtr_probe_interval = 60 * HZ,
09c884d4 269#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 270 .accept_ra_rt_info_min_plen = 0,
09c884d4
YH		 271 .accept_ra_rt_info_max_plen = 0,
272#endif
930d6ff2 273#endif
fbea49e1 274 .proxy_ndp = 0,
0bcbc926 275 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 276 .disable_ipv6 = 0,
1b34be74 277 .accept_dad = 1,
b800c3b9 278 .suppress_frag_ndisc = 1,
c2943f14 279 .accept_ra_mtu = 1,
3d1bec99
HFS		 280 .stable_secret = {
281 .initialized = false,
282 },
3985e8a3 283 .use_oif_addrs_only = 0,
35103d11 284 .ignore_routes_with_linkdown = 0,
f1705ec1 285 .keep_addr_on_down = 0,
1ababeba 286 .seg6_enabled = 0,
bf355b8d
DL		 287#ifdef CONFIG_IPV6_SEG6_HMAC
288 .seg6_require_hmac = 0,
289#endif
adc176c5 290 .enhanced_dad = 1,
d35a00b8 291 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
df789fe7 292 .disable_policy = 0,
8610c7c6 293 .rpl_seg_enabled = 0,
9ee11f0f
JI		 294 .ioam6_enabled = 0,
295 .ioam6_id = IOAM6_DEFAULT_IF_ID,
296 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE,
18ac597a 297 .ndisc_evict_nocarrier = 1,
1da177e4
LT		 298};
299
1f372c7b
MM		 300/* Check if link is ready: is it up and is a valid qdisc available */
301static inline bool addrconf_link_ready(const struct net_device *dev)
f24e3d65 302{
1f372c7b 303 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
f24e3d65
MC		 304}
305
b7b1bfce 306static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 307{
b7b1bfce
HFS		 308 if (del_timer(&idev->rs_timer))
309 __in6_dev_put(idev);
310}
311
c15b1cca 312static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 313{
c15b1cca 314 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 315 __in6_ifa_put(ifp);
316}
317
b7b1bfce
HFS		 318static void addrconf_mod_rs_timer(struct inet6_dev *idev,
319 unsigned long when)
320{
321 if (!timer_pending(&idev->rs_timer))
322 in6_dev_hold(idev);
323 mod_timer(&idev->rs_timer, jiffies + when);
324}
1da177e4 325
c15b1cca
HFS		 326static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
327 unsigned long delay)
1da177e4 328{
f8a894b2
XL		 329 in6_ifa_hold(ifp);
330 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
331 in6_ifa_put(ifp);
1da177e4
LT		 332}
333
7f7d9a6b
HX		 334static int snmp6_alloc_dev(struct inet6_dev *idev)
335{
827da44c
JS		 336 int i;
337
425b9c7f 338 idev->stats.ipv6 = alloc_percpu_gfp(struct ipstats_mib, GFP_KERNEL_ACCOUNT);
698365fa 339 if (!idev->stats.ipv6)
7f7d9a6b 340 goto err_ip;
827da44c
JS		 341
342 for_each_possible_cpu(i) {
343 struct ipstats_mib *addrconf_stats;
698365fa 344 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 345 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 346 }
347
348
be281e55
ED		 349 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
350 GFP_KERNEL);
351 if (!idev->stats.icmpv6dev)
7f7d9a6b 352 goto err_icmp;
be281e55 353 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
425b9c7f 354 GFP_KERNEL_ACCOUNT);
be281e55 355 if (!idev->stats.icmpv6msgdev)
14878f75 356 goto err_icmpmsg;
7f7d9a6b
HX		 357
358 return 0;
359
14878f75 360err_icmpmsg:
be281e55 361 kfree(idev->stats.icmpv6dev);
7f7d9a6b 362err_icmp:
698365fa 363 free_percpu(idev->stats.ipv6);
7f7d9a6b 364err_ip:
aaf70ec7 365 return -ENOMEM;
7f7d9a6b
HX		 366}
367
8e5e8f30 368static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 369{
370 struct inet6_dev *ndev;
a317a2f1 371 int err = -ENOMEM;
1da177e4
LT		 372
373 ASSERT_RTNL();
374
e5f80fcf 375 if (dev->mtu < IPV6_MIN_MTU && dev != blackhole_netdev)
a317a2f1 376 return ERR_PTR(-EINVAL);
1da177e4 377
425b9c7f 378 ndev = kzalloc(sizeof(*ndev), GFP_KERNEL_ACCOUNT);
63159f29 379 if (!ndev)
a317a2f1 380 return ERR_PTR(err);
322f74a4
IO		 381
382 rwlock_init(&ndev->lock);
383 ndev->dev = dev;
502a2ffd 384 INIT_LIST_HEAD(&ndev->addr_list);
e99e88a9 385 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
c346dca1 386 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
9b29c696
HFS		 387
388 if (ndev->cnf.stable_secret.initialized)
d35a00b8 389 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
9b29c696 390
322f74a4 391 ndev->cnf.mtu6 = dev->mtu;
49b99da2 392 ndev->ra_mtu = 0;
322f74a4 393 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
63159f29 394 if (!ndev->nd_parms) {
322f74a4 395 kfree(ndev);
a317a2f1 396 return ERR_PTR(err);
322f74a4 397 }
0187bdfb
BH		 398 if (ndev->cnf.forwarding)
399 dev_disable_lro(dev);
322f74a4 400 /* We refer to the device */
8c727003 401 dev_hold_track(dev, &ndev->dev_tracker, GFP_KERNEL);
1da177e4 402
dd263a8c
IS		 403 if (snmp6_alloc_dev(ndev) < 0) {
404 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
405 __func__);
406 neigh_parms_release(&nd_tbl, ndev->nd_parms);
407 dev_put_track(dev, &ndev->dev_tracker);
408 kfree(ndev);
409 return ERR_PTR(err);
410 }
1da177e4 411
dd263a8c 412 if (dev != blackhole_netdev) {
e5f80fcf
ED		 413 if (snmp6_register_dev(ndev) < 0) {
414 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
415 __func__, dev->name);
416 goto err_release;
417 }
322f74a4 418 }
9d6280da 419 /* One reference from device. */
1be92460 420 refcount_set(&ndev->refcnt, 1);
1da177e4 421
1b34be74
YH		 422 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
423 ndev->cnf.accept_dad = -1;
424
07a93626 425#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 426 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 427 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 428 ndev->cnf.rtr_solicits = 0;
429 }
430#endif
431
372e6c8f 432 INIT_LIST_HEAD(&ndev->tempaddr_list);
76506a98 433 ndev->desync_factor = U32_MAX;
322f74a4
IO		 434 if ((dev->flags&IFF_LOOPBACK) ||
435 dev->type == ARPHRD_TUNNEL ||
9625ed72 436 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 437 dev->type == ARPHRD_SIT ||
0be669bb 438 dev->type == ARPHRD_NONE) {
322f74a4 439 ndev->cnf.use_tempaddr = -1;
969c5464 440 }
5d9efa7e 441
914faa14 442 ndev->token = in6addr_any;
1da177e4 443
1f372c7b 444 if (netif_running(dev) && addrconf_link_ready(dev))
53aadcc9
HX		 445 ndev->if_flags |= IF_READY;
446
322f74a4
IO		 447 ipv6_mc_init_dev(ndev);
448 ndev->tstamp = jiffies;
e5f80fcf
ED		 449 if (dev != blackhole_netdev) {
450 err = addrconf_sysctl_register(ndev);
451 if (err) {
452 ipv6_mc_destroy_dev(ndev);
453 snmp6_unregister_dev(ndev);
454 goto err_release;
455 }
a317a2f1 456 }
30c4cf57 457 /* protected by rtnl_lock */
cf778b00 458 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 459
e5f80fcf
ED		 460 if (dev != blackhole_netdev) {
461 /* Join interface-local all-node multicast group */
462 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
2c5e8933 463
e5f80fcf
ED		 464 /* Join all-node multicast group */
465 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d6ddef9e 466
e5f80fcf
ED		 467 /* Join all-router multicast group if forwarding is set */
468 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
469 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
470 }
1da177e4 471 return ndev;
a317a2f1
WC		 472
473err_release:
474 neigh_parms_release(&nd_tbl, ndev->nd_parms);
475 ndev->dead = 1;
476 in6_dev_finish_destroy(ndev);
477 return ERR_PTR(err);
1da177e4
LT		 478}
479
8e5e8f30 480static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 481{
482 struct inet6_dev *idev;
483
484 ASSERT_RTNL();
485
e21e8467
SH		 486 idev = __in6_dev_get(dev);
487 if (!idev) {
488 idev = ipv6_add_dev(dev);
a317a2f1 489 if (IS_ERR(idev))
db0b99f5 490 return idev;
1da177e4 491 }
c5e33bdd 492
1da177e4
LT		 493 if (dev->flags&IFF_UP)
494 ipv6_mc_up(idev);
495 return idev;
496}
497
f3a1bfb1
ND		 498static int inet6_netconf_msgsize_devconf(int type)
499{
500 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
501 + nla_total_size(4); /* NETCONFA_IFINDEX */
136ba622 502 bool all = false;
f3a1bfb1 503
136ba622
ZS		 504 if (type == NETCONFA_ALL)
505 all = true;
506
507 if (all || type == NETCONFA_FORWARDING)
f3a1bfb1 508 size += nla_total_size(4);
b1afce95 509#ifdef CONFIG_IPV6_MROUTE
136ba622 510 if (all || type == NETCONFA_MC_FORWARDING)
d67b8c61 511 size += nla_total_size(4);
b1afce95 512#endif
136ba622 513 if (all || type == NETCONFA_PROXY_NEIGH)
c92d5491 514 size += nla_total_size(4);
f3a1bfb1 515
136ba622 516 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
35103d11
AG		 517 size += nla_total_size(4);
518
f3a1bfb1
ND		 519 return size;
520}
521
522static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
523 struct ipv6_devconf *devconf, u32 portid,
524 u32 seq, int event, unsigned int flags,
525 int type)
526{
527 struct nlmsghdr *nlh;
528 struct netconfmsg *ncm;
136ba622 529 bool all = false;
f3a1bfb1
ND		 530
531 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
532 flags);
63159f29 533 if (!nlh)
f3a1bfb1
ND		 534 return -EMSGSIZE;
535
136ba622
ZS		 536 if (type == NETCONFA_ALL)
537 all = true;
538
f3a1bfb1
ND		 539 ncm = nlmsg_data(nlh);
540 ncm->ncm_family = AF_INET6;
541
542 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
543 goto nla_put_failure;
544
23452170
DA		 545 if (!devconf)
546 goto out;
547
136ba622 548 if ((all || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 549 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
550 goto nla_put_failure;
b1afce95 551#ifdef CONFIG_IPV6_MROUTE
136ba622 552 if ((all || type == NETCONFA_MC_FORWARDING) &&
d67b8c61 553 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
145c7a79 554 atomic_read(&devconf->mc_forwarding)) < 0)
d67b8c61 555 goto nla_put_failure;
b1afce95 556#endif
136ba622 557 if ((all || type == NETCONFA_PROXY_NEIGH) &&
c92d5491 558 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
559 goto nla_put_failure;
560
136ba622 561 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
35103d11
AG		 562 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
563 devconf->ignore_routes_with_linkdown) < 0)
564 goto nla_put_failure;
565
23452170 566out:
053c095a
JB		 567 nlmsg_end(skb, nlh);
568 return 0;
f3a1bfb1
ND		 569
570nla_put_failure:
571 nlmsg_cancel(skb, nlh);
572 return -EMSGSIZE;
573}
574
85b3daad
DA		 575void inet6_netconf_notify_devconf(struct net *net, int event, int type,
576 int ifindex, struct ipv6_devconf *devconf)
f3a1bfb1
ND		 577{
578 struct sk_buff *skb;
579 int err = -ENOBUFS;
580
927265bc 581 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
63159f29 582 if (!skb)
f3a1bfb1
ND		 583 goto errout;
584
585 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
85b3daad 586 event, 0, type);
f3a1bfb1
ND		 587 if (err < 0) {
588 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
589 WARN_ON(err == -EMSGSIZE);
590 kfree_skb(skb);
591 goto errout;
592 }
927265bc 593 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
f3a1bfb1
ND		 594 return;
595errout:
bd779028 596 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 597}
598
76f8f6cb
ND		 599static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
600 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
601 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 602 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
35103d11 603 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
76f8f6cb
ND		 604};
605
38d51810
JK		 606static int inet6_netconf_valid_get_req(struct sk_buff *skb,
607 const struct nlmsghdr *nlh,
608 struct nlattr **tb,
609 struct netlink_ext_ack *extack)
610{
611 int i, err;
612
613 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
614 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
615 return -EINVAL;
616 }
617
618 if (!netlink_strict_get_check(skb))
8cb08174
JB		 619 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
620 tb, NETCONFA_MAX,
621 devconf_ipv6_policy, extack);
38d51810 622
8cb08174
JB		 623 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
624 tb, NETCONFA_MAX,
625 devconf_ipv6_policy, extack);
38d51810
JK		 626 if (err)
627 return err;
628
629 for (i = 0; i <= NETCONFA_MAX; i++) {
630 if (!tb[i])
631 continue;
632
633 switch (i) {
634 case NETCONFA_IFINDEX:
635 break;
636 default:
637 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
638 return -EINVAL;
639 }
640 }
641
642 return 0;
643}
644
76f8f6cb 645static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
c21ef3e3
DA		 646 struct nlmsghdr *nlh,
647 struct netlink_ext_ack *extack)
76f8f6cb
ND		 648{
649 struct net *net = sock_net(in_skb->sk);
650 struct nlattr *tb[NETCONFA_MAX+1];
4ea2607f
FW		 651 struct inet6_dev *in6_dev = NULL;
652 struct net_device *dev = NULL;
76f8f6cb
ND		 653 struct sk_buff *skb;
654 struct ipv6_devconf *devconf;
76f8f6cb
ND		 655 int ifindex;
656 int err;
657
38d51810 658 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
76f8f6cb 659 if (err < 0)
4ea2607f 660 return err;
76f8f6cb 661
76f8f6cb 662 if (!tb[NETCONFA_IFINDEX])
4ea2607f 663 return -EINVAL;
76f8f6cb 664
4ea2607f 665 err = -EINVAL;
76f8f6cb
ND		 666 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
667 switch (ifindex) {
668 case NETCONFA_IFINDEX_ALL:
669 devconf = net->ipv6.devconf_all;
670 break;
671 case NETCONFA_IFINDEX_DEFAULT:
672 devconf = net->ipv6.devconf_dflt;
673 break;
674 default:
4ea2607f 675 dev = dev_get_by_index(net, ifindex);
63159f29 676 if (!dev)
4ea2607f
FW		 677 return -EINVAL;
678 in6_dev = in6_dev_get(dev);
63159f29 679 if (!in6_dev)
76f8f6cb
ND		 680 goto errout;
681 devconf = &in6_dev->cnf;
682 break;
683 }
684
685 err = -ENOBUFS;
4ea2607f 686 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
63159f29 687 if (!skb)
76f8f6cb
ND		 688 goto errout;
689
690 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
691 NETLINK_CB(in_skb).portid,
692 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
136ba622 693 NETCONFA_ALL);
76f8f6cb
ND		 694 if (err < 0) {
695 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
696 WARN_ON(err == -EMSGSIZE);
697 kfree_skb(skb);
698 goto errout;
699 }
700 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
701errout:
4ea2607f
FW		 702 if (in6_dev)
703 in6_dev_put(in6_dev);
1160dfa1 704 dev_put(dev);
76f8f6cb
ND		 705 return err;
706}
707
7a674200
ND		 708static int inet6_netconf_dump_devconf(struct sk_buff *skb,
709 struct netlink_callback *cb)
710{
addd383f 711 const struct nlmsghdr *nlh = cb->nlh;
7a674200
ND		 712 struct net *net = sock_net(skb->sk);
713 int h, s_h;
714 int idx, s_idx;
715 struct net_device *dev;
716 struct inet6_dev *idev;
717 struct hlist_head *head;
718
addd383f
DA		 719 if (cb->strict_check) {
720 struct netlink_ext_ack *extack = cb->extack;
721 struct netconfmsg *ncm;
722
723 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
724 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
725 return -EINVAL;
726 }
727
728 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
729 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
730 return -EINVAL;
731 }
732 }
733
7a674200
ND		 734 s_h = cb->args[0];
735 s_idx = idx = cb->args[1];
736
737 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
738 idx = 0;
739 head = &net->dev_index_head[h];
740 rcu_read_lock();
63998ac2
ND		 741 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
742 net->dev_base_seq;
7a674200
ND		 743 hlist_for_each_entry_rcu(dev, head, index_hlist) {
744 if (idx < s_idx)
745 goto cont;
746 idev = __in6_dev_get(dev);
747 if (!idev)
748 goto cont;
749
750 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
751 &idev->cnf,
752 NETLINK_CB(cb->skb).portid,
addd383f 753 nlh->nlmsg_seq,
7a674200
ND		 754 RTM_NEWNETCONF,
755 NLM_F_MULTI,
136ba622 756 NETCONFA_ALL) < 0) {
7a674200
ND		 757 rcu_read_unlock();
758 goto done;
759 }
63998ac2 760 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 761cont:
762 idx++;
763 }
764 rcu_read_unlock();
765 }
766 if (h == NETDEV_HASHENTRIES) {
767 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
768 net->ipv6.devconf_all,
769 NETLINK_CB(cb->skb).portid,
addd383f 770 nlh->nlmsg_seq,
7a674200 771 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 772 NETCONFA_ALL) < 0)
7a674200
ND		 773 goto done;
774 else
775 h++;
776 }
777 if (h == NETDEV_HASHENTRIES + 1) {
778 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
779 net->ipv6.devconf_dflt,
780 NETLINK_CB(cb->skb).portid,
addd383f 781 nlh->nlmsg_seq,
7a674200 782 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 783 NETCONFA_ALL) < 0)
7a674200
ND		 784 goto done;
785 else
786 h++;
787 }
788done:
789 cb->args[0] = h;
790 cb->args[1] = idx;
791
792 return skb->len;
793}
794
1da177e4
LT		 795#ifdef CONFIG_SYSCTL
796static void dev_forward_change(struct inet6_dev *idev)
797{
798 struct net_device *dev;
799 struct inet6_ifaddr *ifa;
51454ea4 800 LIST_HEAD(tmp_addr_list);
1da177e4
LT		 801
802 if (!idev)
803 return;
804 dev = idev->dev;
0187bdfb
BH		 805 if (idev->cnf.forwarding)
806 dev_disable_lro(dev);
1a940835 807 if (dev->flags & IFF_MULTICAST) {
2c5e8933 808 if (idev->cnf.forwarding) {
f3ee4010 809 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 810 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
811 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
812 } else {
f3ee4010 813 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 814 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
815 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
816 }
1da177e4 817 }
502a2ffd 818
51454ea4 819 read_lock_bh(&idev->lock);
502a2ffd 820 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 821 if (ifa->flags&IFA_F_TENTATIVE)
822 continue;
51454ea4
ND		 823 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
824 }
825 read_unlock_bh(&idev->lock);
826
827 while (!list_empty(&tmp_addr_list)) {
828 ifa = list_first_entry(&tmp_addr_list,
829 struct inet6_ifaddr, if_list_aux);
830 list_del(&ifa->if_list_aux);
1da177e4
LT		 831 if (idev->cnf.forwarding)
832 addrconf_join_anycast(ifa);
833 else
834 addrconf_leave_anycast(ifa);
835 }
51454ea4 836
85b3daad
DA		 837 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
838 NETCONFA_FORWARDING,
f3a1bfb1 839 dev->ifindex, &idev->cnf);
1da177e4
LT		 840}
841
842
e186932b 843static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 844{
845 struct net_device *dev;
846 struct inet6_dev *idev;
847
4acd4945 848 for_each_netdev(net, dev) {
1da177e4
LT		 849 idev = __in6_dev_get(dev);
850 if (idev) {
e186932b
PE		 851 int changed = (!idev->cnf.forwarding) ^ (!newf);
852 idev->cnf.forwarding = newf;
1da177e4
LT		 853 if (changed)
854 dev_forward_change(idev);
855 }
1da177e4 856 }
1da177e4 857}
c8fecf22 858
013d97e9 859static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 860{
bff16c2f 861 struct net *net;
013d97e9
FR		 862 int old;
863
864 if (!rtnl_trylock())
865 return restart_syscall();
bff16c2f
PE		 866
867 net = (struct net *)table->extra2;
013d97e9
FR		 868 old = *p;
869 *p = newf;
b325fddb 870
013d97e9 871 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1 872 if ((!newf) ^ (!old))
85b3daad
DA		 873 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
874 NETCONFA_FORWARDING,
f3a1bfb1
ND		 875 NETCONFA_IFINDEX_DEFAULT,
876 net->ipv6.devconf_dflt);
013d97e9
FR		 877 rtnl_unlock();
878 return 0;
88af182e 879 }
c8fecf22 880
e186932b 881 if (p == &net->ipv6.devconf_all->forwarding) {
d26c638c
ND		 882 int old_dflt = net->ipv6.devconf_dflt->forwarding;
883
e186932b 884 net->ipv6.devconf_dflt->forwarding = newf;
d26c638c 885 if ((!newf) ^ (!old_dflt))
85b3daad
DA		 886 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
887 NETCONFA_FORWARDING,
d26c638c
ND		 888 NETCONFA_IFINDEX_DEFAULT,
889 net->ipv6.devconf_dflt);
890
e186932b 891 addrconf_forward_change(net, newf);
f3a1bfb1 892 if ((!newf) ^ (!old))
85b3daad
DA		 893 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
894 NETCONFA_FORWARDING,
f3a1bfb1
ND		 895 NETCONFA_IFINDEX_ALL,
896 net->ipv6.devconf_all);
013d97e9 897 } else if ((!newf) ^ (!old))
c8fecf22 898 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 899 rtnl_unlock();
c8fecf22 900
013d97e9 901 if (newf)
7b4da532 902 rt6_purge_dflt_routers(net);
b325fddb 903 return 1;
c8fecf22 904}
35103d11
AG		 905
906static void addrconf_linkdown_change(struct net *net, __s32 newf)
907{
908 struct net_device *dev;
909 struct inet6_dev *idev;
910
911 for_each_netdev(net, dev) {
912 idev = __in6_dev_get(dev);
913 if (idev) {
914 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
915
916 idev->cnf.ignore_routes_with_linkdown = newf;
917 if (changed)
918 inet6_netconf_notify_devconf(dev_net(dev),
85b3daad 919 RTM_NEWNETCONF,
35103d11
AG		 920 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
921 dev->ifindex,
922 &idev->cnf);
923 }
924 }
925}
926
927static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
928{
929 struct net *net;
930 int old;
931
932 if (!rtnl_trylock())
933 return restart_syscall();
934
935 net = (struct net *)table->extra2;
936 old = *p;
937 *p = newf;
938
939 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
940 if ((!newf) ^ (!old))
941 inet6_netconf_notify_devconf(net,
85b3daad 942 RTM_NEWNETCONF,
35103d11
AG		 943 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
944 NETCONFA_IFINDEX_DEFAULT,
945 net->ipv6.devconf_dflt);
946 rtnl_unlock();
947 return 0;
948 }
949
950 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
951 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
952 addrconf_linkdown_change(net, newf);
953 if ((!newf) ^ (!old))
954 inet6_netconf_notify_devconf(net,
85b3daad 955 RTM_NEWNETCONF,
35103d11
AG		 956 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
957 NETCONFA_IFINDEX_ALL,
958 net->ipv6.devconf_all);
959 }
960 rtnl_unlock();
961
962 return 1;
963}
964
1da177e4
LT		 965#endif
966
5c578aed 967/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 968void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
969{
c2e21293 970 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 971
1da177e4 972#ifdef NET_REFCNT_DEBUG
91df42be 973 pr_debug("%s\n", __func__);
1da177e4
LT		 974#endif
975
976 in6_dev_put(ifp->idev);
977
c15b1cca
HFS		 978 if (cancel_delayed_work(&ifp->dad_work))
979 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
980 ifp);
1da177e4 981
e9d3e084 982 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 983 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 984 return;
985 }
1da177e4 986
e5785985 987 kfree_rcu(ifp, rcu);
1da177e4
LT		 988}
989
e55ffac6
BH		 990static void
991ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
992{
502a2ffd 993 struct list_head *p;
8a6ce0c0 994 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 995
996 /*
997 * Each device address list is sorted in order of scope -
998 * global before linklocal.
999 */
502a2ffd 1000 list_for_each(p, &idev->addr_list) {
1001 struct inet6_ifaddr *ifa
1002 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 1003 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 1004 break;
1005 }
1006
8ef802aa 1007 list_add_tail_rcu(&ifp->if_list, p);
e55ffac6
BH		 1008}
1009
3f27fb23 1010static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
3eb84f49 1011{
3f27fb23
ED		 1012 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
1013
1014 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 1015}
1016
56fc709b 1017static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
752a9292 1018 struct net_device *dev, unsigned int hash)
56fc709b 1019{
56fc709b
ED		 1020 struct inet6_ifaddr *ifp;
1021
e66d1172 1022 hlist_for_each_entry(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
56fc709b
ED		 1023 if (ipv6_addr_equal(&ifp->addr, addr)) {
1024 if (!dev || ifp->idev->dev == dev)
1025 return true;
1026 }
1027 }
1028 return false;
1029}
1030
f3d9832e
DA		 1031static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1032{
e66d1172
ED		 1033 struct net *net = dev_net(dev);
1034 unsigned int hash = inet6_addr_hash(net, &ifa->addr);
f3d9832e
DA		 1035 int err = 0;
1036
e66d1172 1037 spin_lock(&net->ipv6.addrconf_hash_lock);
f3d9832e
DA		 1038
1039 /* Ignore adding duplicate addresses on an interface */
e66d1172 1040 if (ipv6_chk_same_addr(net, &ifa->addr, dev, hash)) {
e32ac250 1041 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
f3d9832e 1042 err = -EEXIST;
752a9292 1043 } else {
e66d1172 1044 hlist_add_head_rcu(&ifa->addr_lst, &net->ipv6.inet6_addr_lst[hash]);
f3d9832e
DA		 1045 }
1046
e66d1172 1047 spin_unlock(&net->ipv6.addrconf_hash_lock);
f3d9832e
DA		 1048
1049 return err;
1050}
1051
1da177e4
LT		 1052/* On success it returns ifp with increased reference count */
1053
1054static struct inet6_ifaddr *
e6464b8c 1055ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
de95e047 1056 bool can_block, struct netlink_ext_ack *extack)
1da177e4 1057{
f3d9832e 1058 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
e6464b8c 1059 int addr_type = ipv6_addr_type(cfg->pfx);
df789fe7 1060 struct net *net = dev_net(idev->dev);
1da177e4 1061 struct inet6_ifaddr *ifa = NULL;
360a9887 1062 struct fib6_info *f6i = NULL;
1da177e4 1063 int err = 0;
d68b8270
YH		 1064
1065 if (addr_type == IPV6_ADDR_ANY ||
f17f7648
HL		 1066 (addr_type & IPV6_ADDR_MULTICAST &&
1067 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) ||
d68b8270 1068 (!(idev->dev->flags & IFF_LOOPBACK) &&
3ede0bbc 1069 !netif_is_l3_master(idev->dev) &&
d68b8270
YH		 1070 addr_type & IPV6_ADDR_LOOPBACK))
1071 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 1072
1da177e4
LT		 1073 if (idev->dead) {
1074 err = -ENODEV; /*XXX*/
f3d9832e 1075 goto out;
1da177e4
LT		 1076 }
1077
56d417b1 1078 if (idev->cnf.disable_ipv6) {
9bdd8d40 1079 err = -EACCES;
f3d9832e 1080 goto out;
9bdd8d40
BH		 1081 }
1082
ff7883ea
DA		 1083 /* validator notifier needs to be blocking;
1084 * do not call in atomic context
1085 */
1086 if (can_block) {
1087 struct in6_validator_info i6vi = {
e6464b8c 1088 .i6vi_addr = *cfg->pfx,
ff7883ea 1089 .i6vi_dev = idev,
de95e047 1090 .extack = extack,
ff7883ea
DA		 1091 };
1092
1093 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1094 err = notifier_to_errno(err);
1095 if (err < 0)
1096 goto out;
1097 }
1da177e4 1098
6126891c 1099 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT);
63159f29 1100 if (!ifa) {
1da177e4
LT		 1101 err = -ENOBUFS;
1102 goto out;
1103 }
1104
e6464b8c 1105 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
360a9887
DA		 1106 if (IS_ERR(f6i)) {
1107 err = PTR_ERR(f6i);
1108 f6i = NULL;
1da177e4
LT		 1109 goto out;
1110 }
1111
df789fe7
DF		 1112 if (net->ipv6.devconf_all->disable_policy ||
1113 idev->cnf.disable_policy)
360a9887 1114 f6i->dst_nopolicy = true;
df789fe7 1115
bba24896
JP		 1116 neigh_parms_data_state_setall(idev->nd_parms);
1117
e6464b8c
DA		 1118 ifa->addr = *cfg->pfx;
1119 if (cfg->peer_pfx)
1120 ifa->peer_addr = *cfg->peer_pfx;
1da177e4
LT		 1121
1122 spin_lock_init(&ifa->lock);
c15b1cca 1123 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 1124 INIT_HLIST_NODE(&ifa->addr_lst);
e6464b8c
DA		 1125 ifa->scope = cfg->scope;
1126 ifa->prefix_len = cfg->plen;
8308f3ff 1127 ifa->rt_priority = cfg->rt_priority;
e6464b8c 1128 ifa->flags = cfg->ifa_flags;
47f0bd50 1129 ifa->ifa_proto = cfg->ifa_proto;
66eb9f86 1130 /* No need to add the TENTATIVE flag for addresses with NODAD */
e6464b8c 1131 if (!(cfg->ifa_flags & IFA_F_NODAD))
66eb9f86 1132 ifa->flags |= IFA_F_TENTATIVE;
e6464b8c
DA		 1133 ifa->valid_lft = cfg->valid_lft;
1134 ifa->prefered_lft = cfg->preferred_lft;
1da177e4 1135 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 1136 ifa->tokenized = false;
1da177e4 1137
360a9887 1138 ifa->rt = f6i;
57f5f544 1139
1da177e4 1140 ifa->idev = idev;
f3d9832e
DA		 1141 in6_dev_hold(idev);
1142
1da177e4 1143 /* For caller */
271201c0 1144 refcount_set(&ifa->refcnt, 1);
1da177e4 1145
f3d9832e 1146 rcu_read_lock_bh();
1da177e4 1147
f3d9832e
DA		 1148 err = ipv6_add_addr_hash(idev->dev, ifa);
1149 if (err < 0) {
1150 rcu_read_unlock_bh();
1151 goto out;
1152 }
1da177e4
LT		 1153
1154 write_lock(&idev->lock);
f3d9832e 1155
1da177e4 1156 /* Add to inet6_dev unicast addr list. */
e55ffac6 1157 ipv6_link_dev_addr(idev, ifa);
1da177e4 1158
1da177e4 1159 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 1160 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 1161 in6_ifa_hold(ifa);
1162 }
1da177e4 1163
1da177e4
LT		 1164 in6_ifa_hold(ifa);
1165 write_unlock(&idev->lock);
f3d9832e 1166
8814c4b5 1167 rcu_read_unlock_bh();
1da177e4 1168
f3d9832e
DA		 1169 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1170out:
1171 if (unlikely(err < 0)) {
360a9887 1172 fib6_info_release(f6i);
93531c67 1173
f3d9832e
DA		 1174 if (ifa) {
1175 if (ifa->idev)
1176 in6_dev_put(ifa->idev);
1177 kfree(ifa);
1178 }
1da177e4
LT		 1179 ifa = ERR_PTR(err);
1180 }
1181
1182 return ifa;
1da177e4
LT		 1183}
1184
5b84efec
TH		 1185enum cleanup_prefix_rt_t {
1186 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1187 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1188 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1189};
1190
1191/*
1192 * Check, whether the prefix for ifp would still need a prefix route
1193 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1194 * constants.
1195 *
1196 * 1) we don't purge prefix if address was not permanent.
1197 * prefix is managed by its own lifetime.
1198 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1199 * 3) if there are no addresses, delete prefix.
1200 * 4) if there are still other permanent address(es),
1201 * corresponding prefix is still permanent.
1202 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1203 * don't purge the prefix, assume user space is managing it.
1204 * 6) otherwise, update prefix lifetime to the
1205 * longest valid lifetime among the corresponding
1206 * addresses on the device.
1207 * Note: subsequent RA will update lifetime.
1208 **/
1209static enum cleanup_prefix_rt_t
1210check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1211{
1212 struct inet6_ifaddr *ifa;
1213 struct inet6_dev *idev = ifp->idev;
1214 unsigned long lifetime;
1215 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1216
1217 *expires = jiffies;
1218
1219 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1220 if (ifa == ifp)
1221 continue;
e75913c9
ZL		 1222 if (ifa->prefix_len != ifp->prefix_len ||
1223 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
5b84efec
TH		 1224 ifp->prefix_len))
1225 continue;
1226 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1227 return CLEANUP_PREFIX_RT_NOP;
1228
1229 action = CLEANUP_PREFIX_RT_EXPIRE;
1230
1231 spin_lock(&ifa->lock);
1232
1233 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1234 /*
1235 * Note: Because this address is
1236 * not permanent, lifetime <
1237 * LONG_MAX / HZ here.
1238 */
1239 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1240 *expires = ifa->tstamp + lifetime * HZ;
1241 spin_unlock(&ifa->lock);
1242 }
1243
1244 return action;
1245}
1246
1247static void
d0098e4c
HL		 1248cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1249 bool del_rt, bool del_peer)
5b84efec 1250{
93c2fb25 1251 struct fib6_info *f6i;
5b84efec 1252
d0098e4c
HL		 1253 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1254 ifp->prefix_len,
2b2450ca 1255 ifp->idev->dev, 0, RTF_DEFAULT, true);
93c2fb25 1256 if (f6i) {
5b84efec 1257 if (del_rt)
11dd74b3 1258 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
5b84efec 1259 else {
93c2fb25
DA		 1260 if (!(f6i->fib6_flags & RTF_EXPIRES))
1261 fib6_set_expires(f6i, expires);
1262 fib6_info_release(f6i);
5b84efec
TH		 1263 }
1264 }
1265}
1266
1267
1da177e4
LT		 1268/* This function wants to get referenced ifp and releases it before return */
1269
1270static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1271{
5b84efec 1272 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
e66d1172 1273 struct net *net = dev_net(ifp->idev->dev);
5b84efec 1274 unsigned long expires;
e66d1172 1275 int state;
1da177e4 1276
c15b1cca
HFS		 1277 ASSERT_RTNL();
1278
8e8e676d 1279 spin_lock_bh(&ifp->lock);
4c5ff6a6 1280 state = ifp->state;
e9d3e084 1281 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1282 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1283
1284 if (state == INET6_IFADDR_STATE_DEAD)
1285 goto out;
1da177e4 1286
e66d1172 1287 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
5c578aed 1288 hlist_del_init_rcu(&ifp->addr_lst);
e66d1172 1289 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
1da177e4 1290
5b84efec 1291 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1292
1da177e4 1293 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1294 list_del(&ifp->tmp_list);
1295 if (ifp->ifpub) {
1296 in6_ifa_put(ifp->ifpub);
1297 ifp->ifpub = NULL;
1da177e4 1298 }
372e6c8f 1299 __in6_ifa_put(ifp);
1da177e4 1300 }
1da177e4 1301
5b84efec
TH		 1302 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1303 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1304
8ef802aa 1305 list_del_rcu(&ifp->if_list);
5b84efec
TH		 1306 __in6_ifa_put(ifp);
1307
1308 write_unlock_bh(&ifp->idev->lock);
1da177e4 1309
c15b1cca 1310 addrconf_del_dad_work(ifp);
b2238566 1311
1da177e4
LT		 1312 ipv6_ifa_notify(RTM_DELADDR, ifp);
1313
f88c91dd 1314 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1315
5b84efec
TH		 1316 if (action != CLEANUP_PREFIX_RT_NOP) {
1317 cleanup_prefix_route(ifp, expires,
d0098e4c 1318 action == CLEANUP_PREFIX_RT_DEL, false);
1da177e4
LT		 1319 }
1320
c3968a85
DW		 1321 /* clean up prefsrc entries */
1322 rt6_remove_prefsrc(ifp);
4c5ff6a6 1323out:
1da177e4
LT		 1324 in6_ifa_put(ifp);
1325}
1326
969c5464 1327static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
1da177e4
LT		 1328{
1329 struct inet6_dev *idev = ifp->idev;
e6464b8c 1330 unsigned long tmp_tstamp, age;
eac55bf9 1331 unsigned long regen_advance;
76f793e3 1332 unsigned long now = jiffies;
7aa8e63f 1333 s32 cnf_temp_preferred_lft;
969c5464
FG		 1334 struct inet6_ifaddr *ift;
1335 struct ifa6_config cfg;
1336 long max_desync_factor;
1337 struct in6_addr addr;
1338 int ret = 0;
1da177e4 1339
53bd6749 1340 write_lock_bh(&idev->lock);
969c5464 1341
1da177e4
LT		 1342retry:
1343 in6_dev_hold(idev);
1344 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1345 write_unlock_bh(&idev->lock);
f3213831 1346 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1347 in6_dev_put(idev);
1348 ret = -1;
1349 goto out;
1350 }
1351 spin_lock_bh(&ifp->lock);
1352 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1353 idev->cnf.use_tempaddr = -1; /*XXX*/
1354 spin_unlock_bh(&ifp->lock);
53bd6749 1355 write_unlock_bh(&idev->lock);
f3213831
JP		 1356 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1357 __func__);
1da177e4
LT		 1358 in6_dev_put(idev);
1359 ret = -1;
1360 goto out;
1361 }
1362 in6_ifa_hold(ifp);
1363 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
969c5464
FG		 1364 ipv6_gen_rnd_iid(&addr);
1365
76f793e3 1366 age = (now - ifp->tstamp) / HZ;
76506a98
JB		 1367
1368 regen_advance = idev->cnf.regen_max_retry *
1369 idev->cnf.dad_transmits *
19e16d22 1370 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
76506a98
JB		 1371
1372 /* recalculate max_desync_factor each time and update
1373 * idev->desync_factor if it's larger
1374 */
7aa8e63f 1375 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
76506a98
JB		 1376 max_desync_factor = min_t(__u32,
1377 idev->cnf.max_desync_factor,
7aa8e63f 1378 cnf_temp_preferred_lft - regen_advance);
76506a98
JB		 1379
1380 if (unlikely(idev->desync_factor > max_desync_factor)) {
1381 if (max_desync_factor > 0) {
1382 get_random_bytes(&idev->desync_factor,
1383 sizeof(idev->desync_factor));
1384 idev->desync_factor %= max_desync_factor;
1385 } else {
1386 idev->desync_factor = 0;
1387 }
1388 }
1389
3f2d67b6 1390 memset(&cfg, 0, sizeof(cfg));
e6464b8c 1391 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
7a876b0e 1392 idev->cnf.temp_valid_lft + age);
e6464b8c
DA		 1393 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1394 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1395
1396 cfg.plen = ifp->prefix_len;
1da177e4
LT		 1397 tmp_tstamp = ifp->tstamp;
1398 spin_unlock_bh(&ifp->lock);
1399
53bd6749 1400 write_unlock_bh(&idev->lock);
95c385b4 1401
eac55bf9
BB		 1402 /* A temporary address is created only if this calculated Preferred
1403 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1404 * an implementation must not create a temporary address with a zero
1405 * Preferred Lifetime.
ecab6701
HK		 1406 * Use age calculation as in addrconf_verify to avoid unnecessary
1407 * temporary addresses being generated.
eac55bf9 1408 */
ecab6701 1409 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
e6464b8c 1410 if (cfg.preferred_lft <= regen_advance + age) {
eac55bf9
BB		 1411 in6_ifa_put(ifp);
1412 in6_dev_put(idev);
1413 ret = -1;
1414 goto out;
1415 }
1416
e6464b8c 1417 cfg.ifa_flags = IFA_F_TEMPORARY;
95c385b4
NH		 1418 /* set in addrconf_prefix_rcv() */
1419 if (ifp->flags & IFA_F_OPTIMISTIC)
e6464b8c 1420 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
95c385b4 1421
e6464b8c
DA		 1422 cfg.pfx = &addr;
1423 cfg.scope = ipv6_addr_scope(cfg.pfx);
95c385b4 1424
e6464b8c 1425 ift = ipv6_add_addr(idev, &cfg, block, NULL);
4b08a8f1 1426 if (IS_ERR(ift)) {
1da177e4
LT		 1427 in6_ifa_put(ifp);
1428 in6_dev_put(idev);
f3213831 1429 pr_info("%s: retry temporary address regeneration\n", __func__);
53bd6749 1430 write_lock_bh(&idev->lock);
1da177e4
LT		 1431 goto retry;
1432 }
1433
1434 spin_lock_bh(&ift->lock);
1435 ift->ifpub = ifp;
76f793e3 1436 ift->cstamp = now;
1da177e4
LT		 1437 ift->tstamp = tmp_tstamp;
1438 spin_unlock_bh(&ift->lock);
1439
cf22f9a2 1440 addrconf_dad_start(ift);
1da177e4
LT		 1441 in6_ifa_put(ift);
1442 in6_dev_put(idev);
1443out:
1444 return ret;
1445}
1da177e4
LT		 1446
1447/*
072047e4 1448 * Choose an appropriate source address (RFC3484)
1da177e4 1449 */
a9b05723
YH		 1450enum {
1451 IPV6_SADDR_RULE_INIT = 0,
1452 IPV6_SADDR_RULE_LOCAL,
1453 IPV6_SADDR_RULE_SCOPE,
1454 IPV6_SADDR_RULE_PREFERRED,
1455#ifdef CONFIG_IPV6_MIP6
1456 IPV6_SADDR_RULE_HOA,
1457#endif
1458 IPV6_SADDR_RULE_OIF,
1459 IPV6_SADDR_RULE_LABEL,
a9b05723 1460 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1461 IPV6_SADDR_RULE_ORCHID,
1462 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1463#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1464 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1465#endif
a9b05723
YH		 1466 IPV6_SADDR_RULE_MAX
1467};
1468
072047e4 1469struct ipv6_saddr_score {
a9b05723
YH		 1470 int rule;
1471 int addr_type;
1472 struct inet6_ifaddr *ifa;
1473 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1474 int scopedist;
1475 int matchlen;
072047e4
YH		 1476};
1477
a9b05723 1478struct ipv6_saddr_dst {
9acd9f3a 1479 const struct in6_addr *addr;
a9b05723
YH		 1480 int ifindex;
1481 int scope;
1482 int label;
7cbca67c 1483 unsigned int prefs;
a9b05723 1484};
072047e4 1485
b6f99a21 1486static inline int ipv6_saddr_preferred(int type)
1da177e4 1487{
45bb0060 1488 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1489 return 1;
1490 return 0;
1da177e4
LT		 1491}
1492
35e015e1
MC		 1493static bool ipv6_use_optimistic_addr(struct net *net,
1494 struct inet6_dev *idev)
7fd2561e
EK		 1495{
1496#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 1497 if (!idev)
1498 return false;
1499 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1500 return false;
1501 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1502 return false;
1503
1504 return true;
7fd2561e
EK		 1505#else
1506 return false;
1507#endif
1508}
1509
f1c02cfb
SD		 1510static bool ipv6_allow_optimistic_dad(struct net *net,
1511 struct inet6_dev *idev)
1512{
1513#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1514 if (!idev)
1515 return false;
1516 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1517 return false;
1518
1519 return true;
1520#else
1521 return false;
1522#endif
1523}
1524
3de23255
BT		 1525static int ipv6_get_saddr_eval(struct net *net,
1526 struct ipv6_saddr_score *score,
a9b05723
YH		 1527 struct ipv6_saddr_dst *dst,
1528 int i)
1529{
1530 int ret;
1531
1532 if (i <= score->rule) {
1533 switch (i) {
1534 case IPV6_SADDR_RULE_SCOPE:
1535 ret = score->scopedist;
1536 break;
1537 case IPV6_SADDR_RULE_PREFIX:
1538 ret = score->matchlen;
1539 break;
1540 default:
1541 ret = !!test_bit(i, score->scorebits);
1542 }
1543 goto out;
1544 }
1545
1546 switch (i) {
1547 case IPV6_SADDR_RULE_INIT:
1548 /* Rule 0: remember if hiscore is not ready yet */
1549 ret = !!score->ifa;
1550 break;
1551 case IPV6_SADDR_RULE_LOCAL:
1552 /* Rule 1: Prefer same address */
1553 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1554 break;
1555 case IPV6_SADDR_RULE_SCOPE:
1556 /* Rule 2: Prefer appropriate scope
1557 *
1558 * ret
1559 * ^
1560 * -1 | d 15
1561 * ---+--+-+---> scope
1562 * |
1563 * | d is scope of the destination.
1564 * B-d | \
1565 * | \ <- smaller scope is better if
db9c7c39 1566 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1567 * | ret = B - scope (-1 <= scope >= d <= 15).
1568 * d-C-1 | /
1569 * |/ <- greater is better
1570 * -C / if scope is not enough for destination.
1571 * /| ret = scope - C (-1 <= d < scope <= 15).
1572 *
1573 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1574 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1575 * Assume B = 0 and we get C > 29.
1576 */
1577 ret = __ipv6_addr_src_scope(score->addr_type);
1578 if (ret >= dst->scope)
1579 ret = -ret;
1580 else
1581 ret -= 128; /* 30 is enough */
1582 score->scopedist = ret;
1583 break;
1584 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1585 {
a9b05723 1586 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1587 u8 avoid = IFA_F_DEPRECATED;
1588
35e015e1 1589 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
7fd2561e 1590 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1591 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1592 !(score->ifa->flags & avoid);
a9b05723 1593 break;
7fd2561e 1594 }
a9b05723
YH		 1595#ifdef CONFIG_IPV6_MIP6
1596 case IPV6_SADDR_RULE_HOA:
7cbca67c 1597 {
a9b05723 1598 /* Rule 4: Prefer home address */
7cbca67c
YH		 1599 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1600 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1601 break;
7cbca67c 1602 }
a9b05723
YH		 1603#endif
1604 case IPV6_SADDR_RULE_OIF:
1605 /* Rule 5: Prefer outgoing interface */
1606 ret = (!dst->ifindex ||
1607 dst->ifindex == score->ifa->idev->dev->ifindex);
1608 break;
1609 case IPV6_SADDR_RULE_LABEL:
1610 /* Rule 6: Prefer matching label */
3de23255
BT		 1611 ret = ipv6_addr_label(net,
1612 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1613 score->ifa->idev->dev->ifindex) == dst->label;
1614 break;
a9b05723 1615 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1616 {
a9b05723 1617 /* Rule 7: Prefer public address
25985edc 1618 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1619 */
7cbca67c
YH		 1620 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1621 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1622 score->ifa->idev->cnf.use_tempaddr >= 2;
1623 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1624 break;
7cbca67c 1625 }
a9b05723
YH		 1626 case IPV6_SADDR_RULE_ORCHID:
1627 /* Rule 8-: Prefer ORCHID vs ORCHID or
1628 * non-ORCHID vs non-ORCHID
1629 */
1630 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1631 ipv6_addr_orchid(dst->addr));
1632 break;
1633 case IPV6_SADDR_RULE_PREFIX:
1634 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1635 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1636 if (ret > score->ifa->prefix_len)
1637 ret = score->ifa->prefix_len;
1638 score->matchlen = ret;
a9b05723 1639 break;
7fd2561e
EK		 1640#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1641 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1642 /* Optimistic addresses still have lower precedence than other
1643 * preferred addresses.
1644 */
1645 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1646 break;
1647#endif
a9b05723
YH		 1648 default:
1649 ret = 0;
1650 }
1651
1652 if (ret)
1653 __set_bit(i, score->scorebits);
1654 score->rule = i;
1655out:
1656 return ret;
1657}
1658
c0b8da1e
YH		 1659static int __ipv6_dev_get_saddr(struct net *net,
1660 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1661 struct inet6_dev *idev,
1662 struct ipv6_saddr_score *scores,
1663 int hiscore_idx)
9131f3de 1664{
c0b8da1e 1665 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de 1666
f59c031e 1667 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
9131f3de
YH		 1668 int i;
1669
1670 /*
1671 * - Tentative Address (RFC2462 section 5.4)
1672 * - A tentative address is not considered
1673 * "assigned to an interface" in the traditional
1674 * sense, unless it is also flagged as optimistic.
1675 * - Candidate Source Address (section 4)
1676 * - In any case, anycast addresses, multicast
1677 * addresses, and the unspecified address MUST
1678 * NOT be included in a candidate set.
1679 */
1680 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1681 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1682 continue;
1683
1684 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1685
1686 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1687 score->addr_type & IPV6_ADDR_MULTICAST)) {
1688 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1689 idev->dev->name);
1690 continue;
1691 }
1692
1693 score->rule = -1;
1694 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1695
1696 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1697 int minihiscore, miniscore;
1698
1699 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1700 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1701
1702 if (minihiscore > miniscore) {
1703 if (i == IPV6_SADDR_RULE_SCOPE &&
1704 score->scopedist > 0) {
1705 /*
1706 * special case:
1707 * each remaining entry
1708 * has too small (not enough)
1709 * scope, because ifa entries
1710 * are sorted by their scope
1711 * values.
1712 */
1713 goto out;
1714 }
1715 break;
1716 } else if (minihiscore < miniscore) {
9131f3de 1717 swap(hiscore, score);
c0b8da1e 1718 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1719
1720 /* restore our iterator */
1721 score->ifa = hiscore->ifa;
1722
1723 break;
1724 }
1725 }
1726 }
1727out:
c0b8da1e 1728 return hiscore_idx;
9131f3de
YH		 1729}
1730
afbac601
DA		 1731static int ipv6_get_saddr_master(struct net *net,
1732 const struct net_device *dst_dev,
1733 const struct net_device *master,
1734 struct ipv6_saddr_dst *dst,
1735 struct ipv6_saddr_score *scores,
1736 int hiscore_idx)
1737{
1738 struct inet6_dev *idev;
1739
1740 idev = __in6_dev_get(dst_dev);
1741 if (idev)
1742 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1743 scores, hiscore_idx);
1744
1745 idev = __in6_dev_get(master);
1746 if (idev)
1747 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1748 scores, hiscore_idx);
1749
1750 return hiscore_idx;
1751}
1752
b3f644fc 1753int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1754 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1755 struct in6_addr *saddr)
1da177e4 1756{
c0b8da1e 1757 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1758 struct ipv6_saddr_dst dst;
9131f3de 1759 struct inet6_dev *idev;
072047e4 1760 struct net_device *dev;
a9b05723 1761 int dst_type;
9131f3de 1762 bool use_oif_addr = false;
c0b8da1e 1763 int hiscore_idx = 0;
cc429c8f 1764 int ret = 0;
1da177e4 1765
a9b05723
YH		 1766 dst_type = __ipv6_addr_type(daddr);
1767 dst.addr = daddr;
1768 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1769 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1770 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1771 dst.prefs = prefs;
a9b05723 1772
c0b8da1e
YH		 1773 scores[hiscore_idx].rule = -1;
1774 scores[hiscore_idx].ifa = NULL;
1da177e4 1775
8814c4b5 1776 rcu_read_lock();
1da177e4 1777
9131f3de
YH		 1778 /* Candidate Source Address (section 4)
1779 * - multicast and link-local destination address,
1780 * the set of candidate source address MUST only
1781 * include addresses assigned to interfaces
1782 * belonging to the same link as the outgoing
1783 * interface.
1784 * (- For site-local destination addresses, the
1785 * set of candidate source addresses MUST only
1786 * include addresses assigned to interfaces
1787 * belonging to the same site as the outgoing
1788 * interface.)
3985e8a3
EK		 1789 * - "It is RECOMMENDED that the candidate source addresses
1790 * be the set of unicast addresses assigned to the
1791 * interface that will be used to send to the destination
1792 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1793 */
1794 if (dst_dev) {
3985e8a3 1795 idev = __in6_dev_get(dst_dev);
9131f3de 1796 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1797 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1798 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1799 use_oif_addr = true;
1800 }
1801 }
a9b05723 1802
9131f3de 1803 if (use_oif_addr) {
c0b8da1e 1804 if (idev)
c15df306 1805 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de 1806 } else {
afbac601
DA		 1807 const struct net_device *master;
1808 int master_idx = 0;
1809
1810 /* if dst_dev exists and is enslaved to an L3 device, then
1811 * prefer addresses from dst_dev and then the master over
1812 * any other enslaved devices in the L3 domain.
1813 */
1814 master = l3mdev_master_dev_rcu(dst_dev);
1815 if (master) {
1816 master_idx = master->ifindex;
1817
1818 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1819 master, &dst,
1820 scores, hiscore_idx);
1821
1822 if (scores[hiscore_idx].ifa)
1823 goto out;
1824 }
1825
9131f3de 1826 for_each_netdev_rcu(net, dev) {
afbac601
DA		 1827 /* only consider addresses on devices in the
1828 * same L3 domain
1829 */
1830 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1831 continue;
9131f3de
YH		 1832 idev = __in6_dev_get(dev);
1833 if (!idev)
072047e4 1834 continue;
c15df306 1835 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1836 }
1837 }
afbac601
DA		 1838
1839out:
c0b8da1e 1840 hiscore = &scores[hiscore_idx];
a9b05723 1841 if (!hiscore->ifa)
cc429c8f
ED		 1842 ret = -EADDRNOTAVAIL;
1843 else
1844 *saddr = hiscore->ifa->addr;
1ab1457c 1845
cc429c8f
ED		 1846 rcu_read_unlock();
1847 return ret;
1da177e4 1848}
5e5f3f0f 1849EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1850
26394fc1
IK		 1851static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1852 u32 banned_flags)
b7b1bfce
HFS		 1853{
1854 struct inet6_ifaddr *ifp;
1855 int err = -EADDRNOTAVAIL;
1856
602582ca
HFS		 1857 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1858 if (ifp->scope > IFA_LINK)
1859 break;
b7b1bfce
HFS		 1860 if (ifp->scope == IFA_LINK &&
1861 !(ifp->flags & banned_flags)) {
1862 *addr = ifp->addr;
1863 err = 0;
1864 break;
1865 }
1866 }
1867 return err;
1868}
1869
95c385b4 1870int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1871 u32 banned_flags)
1da177e4
LT		 1872{
1873 struct inet6_dev *idev;
1874 int err = -EADDRNOTAVAIL;
1875
8814c4b5 1876 rcu_read_lock();
e21e8467
SH		 1877 idev = __in6_dev_get(dev);
1878 if (idev) {
1da177e4 1879 read_lock_bh(&idev->lock);
b7b1bfce 1880 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1881 read_unlock_bh(&idev->lock);
1882 }
8814c4b5 1883 rcu_read_unlock();
1da177e4
LT		 1884 return err;
1885}
1886
d9bf82c2 1887static int ipv6_count_addresses(const struct inet6_dev *idev)
1da177e4 1888{
d9bf82c2 1889 const struct inet6_ifaddr *ifp;
1da177e4 1890 int cnt = 0;
1da177e4 1891
d9bf82c2
ED		 1892 rcu_read_lock();
1893 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1da177e4 1894 cnt++;
d9bf82c2 1895 rcu_read_unlock();
1da177e4
LT		 1896 return cnt;
1897}
1898
b71d1d42 1899int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1900 const struct net_device *dev, int strict)
c58da4c6 1901{
232378e8
DA		 1902 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1903 strict, IFA_F_TENTATIVE);
c58da4c6
EK		 1904}
1905EXPORT_SYMBOL(ipv6_chk_addr);
1906
1893ff20
DA		 1907/* device argument is used to find the L3 domain of interest. If
1908 * skip_dev_check is set, then the ifp device is not checked against
1909 * the passed in dev argument. So the 2 cases for addresses checks are:
1910 * 1. does the address exist in the L3 domain that dev is part of
1911 * (skip_dev_check = true), or
1912 *
1913 * 2. does the address exist on the specific device
1914 * (skip_dev_check = false)
1915 */
4ef1a7cb
XL		 1916static struct net_device *
1917__ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1918 const struct net_device *dev, bool skip_dev_check,
1919 int strict, u32 banned_flags)
1da177e4 1920{
3f27fb23 1921 unsigned int hash = inet6_addr_hash(net, addr);
4ef1a7cb 1922 struct net_device *l3mdev, *ndev;
eedf042a 1923 struct inet6_ifaddr *ifp;
c58da4c6 1924 u32 ifp_flags;
1da177e4 1925
480318a0 1926 rcu_read_lock();
232378e8 1927
1893ff20 1928 l3mdev = l3mdev_master_dev_rcu(dev);
232378e8
DA		 1929 if (skip_dev_check)
1930 dev = NULL;
1931
e66d1172 1932 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4ef1a7cb 1933 ndev = ifp->idev->dev;
1893ff20 1934
4ef1a7cb 1935 if (l3mdev_master_dev_rcu(ndev) != l3mdev)
1893ff20
DA		 1936 continue;
1937
c58da4c6
EK		 1938 /* Decouple optimistic from tentative for evaluation here.
1939 * Ban optimistic addresses explicitly, when required.
1940 */
1941 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1942 ? (ifp->flags&~IFA_F_TENTATIVE)
1943 : ifp->flags;
1da177e4 1944 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1945 !(ifp_flags&banned_flags) &&
4ef1a7cb 1946 (!dev || ndev == dev ||
eedf042a 1947 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
480318a0 1948 rcu_read_unlock();
4ef1a7cb 1949 return ndev;
1da177e4
LT		 1950 }
1951 }
5c578aed 1952
480318a0 1953 rcu_read_unlock();
4ef1a7cb
XL		 1954 return NULL;
1955}
1956
1957int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1958 const struct net_device *dev, bool skip_dev_check,
1959 int strict, u32 banned_flags)
1960{
1961 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check,
1962 strict, banned_flags) ? 1 : 0;
1da177e4 1963}
c58da4c6 1964EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1965
1da177e4 1966
7df37ff3
CB		 1967/* Compares an address/prefix_len with addresses on device @dev.
1968 * If one is found it returns true.
1969 */
1970bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1971 const unsigned int prefix_len, struct net_device *dev)
1972{
47e26941
ED		 1973 const struct inet6_ifaddr *ifa;
1974 const struct inet6_dev *idev;
7df37ff3
CB		 1975 bool ret = false;
1976
1977 rcu_read_lock();
1978 idev = __in6_dev_get(dev);
1979 if (idev) {
47e26941 1980 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
7df37ff3
CB		 1981 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1982 if (ret)
1983 break;
1984 }
7df37ff3
CB		 1985 }
1986 rcu_read_unlock();
1987
1988 return ret;
1989}
1990EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1991
b71d1d42 1992int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84 1993{
24ba333b
ED		 1994 const struct inet6_ifaddr *ifa;
1995 const struct inet6_dev *idev;
52eeeb84
YH		 1996 int onlink;
1997
1998 onlink = 0;
1999 rcu_read_lock();
2000 idev = __in6_dev_get(dev);
2001 if (idev) {
24ba333b 2002 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 2003 onlink = ipv6_prefix_equal(addr, &ifa->addr,
2004 ifa->prefix_len);
2005 if (onlink)
2006 break;
2007 }
52eeeb84
YH		 2008 }
2009 rcu_read_unlock();
2010 return onlink;
2011}
52eeeb84
YH		 2012EXPORT_SYMBOL(ipv6_chk_prefix);
2013
81f6cb31
XL		 2014/**
2015 * ipv6_dev_find - find the first device with a given source address.
2016 * @net: the net namespace
2017 * @addr: the source address
2c4de211 2018 * @dev: used to find the L3 domain of interest
81f6cb31
XL		 2019 *
2020 * The caller should be protected by RCU, or RTNL.
2021 */
4ef1a7cb
XL		 2022struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
2023 struct net_device *dev)
81f6cb31 2024{
4ef1a7cb
XL		 2025 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1,
2026 IFA_F_TENTATIVE);
81f6cb31
XL		 2027}
2028EXPORT_SYMBOL(ipv6_dev_find);
2029
9acd9f3a 2030struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 2031 struct net_device *dev, int strict)
1da177e4 2032{
3f27fb23 2033 unsigned int hash = inet6_addr_hash(net, addr);
b79d1d54 2034 struct inet6_ifaddr *ifp, *result = NULL;
1da177e4 2035
24f226da 2036 rcu_read_lock();
e66d1172 2037 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
1da177e4 2038 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 2039 if (!dev || ifp->idev->dev == dev ||
1da177e4 2040 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 2041 result = ifp;
1da177e4
LT		 2042 in6_ifa_hold(ifp);
2043 break;
2044 }
2045 }
2046 }
24f226da 2047 rcu_read_unlock();
1da177e4 2048
b79d1d54 2049 return result;
1da177e4
LT		 2050}
2051
1da177e4
LT		 2052/* Gets referenced address, destroys ifaddr */
2053
cc411d0b 2054static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 2055{
3d171f39
LR		 2056 if (dad_failed)
2057 ifp->flags |= IFA_F_DADFAILED;
2058
ec8add2a 2059 if (ifp->flags&IFA_F_TEMPORARY) {
1da177e4
LT		 2060 struct inet6_ifaddr *ifpub;
2061 spin_lock_bh(&ifp->lock);
2062 ifpub = ifp->ifpub;
2063 if (ifpub) {
2064 in6_ifa_hold(ifpub);
2065 spin_unlock_bh(&ifp->lock);
969c5464 2066 ipv6_create_tempaddr(ifpub, true);
1da177e4
LT		 2067 in6_ifa_put(ifpub);
2068 } else {
2069 spin_unlock_bh(&ifp->lock);
2070 }
2071 ipv6_del_addr(ifp);
ec8add2a
SD		 2072 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2073 spin_lock_bh(&ifp->lock);
2074 addrconf_del_dad_work(ifp);
2075 ifp->flags |= IFA_F_TENTATIVE;
f1c02cfb
SD		 2076 if (dad_failed)
2077 ifp->flags &= ~IFA_F_OPTIMISTIC;
ec8add2a
SD		 2078 spin_unlock_bh(&ifp->lock);
2079 if (dad_failed)
2080 ipv6_ifa_notify(0, ifp);
2081 in6_ifa_put(ifp);
c15b1cca 2082 } else {
1da177e4 2083 ipv6_del_addr(ifp);
c15b1cca 2084 }
1da177e4
LT		 2085}
2086
f2344a13
HX		 2087static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2088{
2089 int err = -ENOENT;
2090
8e8e676d 2091 spin_lock_bh(&ifp->lock);
f2344a13
HX		 2092 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2093 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2094 err = 0;
2095 }
8e8e676d 2096 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 2097
2098 return err;
2099}
2100
da13c59b 2101void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
3c21edbd 2102{
1b34be74 2103 struct inet6_dev *idev = ifp->idev;
e66d1172 2104 struct net *net = dev_net(idev->dev);
9bdd8d40 2105
853dc2e0
UB		 2106 if (addrconf_dad_end(ifp)) {
2107 in6_ifa_put(ifp);
f2344a13 2108 return;
853dc2e0 2109 }
f2344a13 2110
da13c59b
VP		 2111 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2112 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
9bdd8d40 2113
5f40ef77
HFS		 2114 spin_lock_bh(&ifp->lock);
2115
2116 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
5f40ef77
HFS		 2117 struct in6_addr new_addr;
2118 struct inet6_ifaddr *ifp2;
5f40ef77 2119 int retries = ifp->stable_privacy_retry + 1;
e6464b8c
DA		 2120 struct ifa6_config cfg = {
2121 .pfx = &new_addr,
2122 .plen = ifp->prefix_len,
2123 .ifa_flags = ifp->flags,
2124 .valid_lft = ifp->valid_lft,
2125 .preferred_lft = ifp->prefered_lft,
2126 .scope = ifp->scope,
2127 };
5f40ef77 2128
1855b7c3 2129 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 2130 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2131 ifp->idev->dev->name);
2132 goto errdad;
2133 }
2134
2135 new_addr = ifp->addr;
2136 if (ipv6_generate_stable_address(&new_addr, retries,
2137 idev))
2138 goto errdad;
2139
5f40ef77 2140 spin_unlock_bh(&ifp->lock);
1b34be74 2141
5f40ef77
HFS		 2142 if (idev->cnf.max_addresses &&
2143 ipv6_count_addresses(idev) >=
2144 idev->cnf.max_addresses)
2145 goto lock_errdad;
2146
2147 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2148 ifp->idev->dev->name);
2149
e6464b8c 2150 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
5f40ef77
HFS		 2151 if (IS_ERR(ifp2))
2152 goto lock_errdad;
2153
2154 spin_lock_bh(&ifp2->lock);
2155 ifp2->stable_privacy_retry = retries;
2156 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2157 spin_unlock_bh(&ifp2->lock);
2158
1855b7c3 2159 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 2160 in6_ifa_put(ifp2);
2161lock_errdad:
2162 spin_lock_bh(&ifp->lock);
1b34be74
YH		 2163 }
2164
5f40ef77 2165errdad:
c15b1cca
HFS		 2166 /* transition from _POSTDAD to _ERRDAD */
2167 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 2168 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 2169
2170 addrconf_mod_dad_work(ifp, 0);
751eb6b6 2171 in6_ifa_put(ifp);
3c21edbd 2172}
1da177e4 2173
a9ed4a29
SD		 2174/* Join to solicited addr multicast group.
2175 * caller must hold RTNL */
b71d1d42 2176void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 2177{
2178 struct in6_addr maddr;
2179
2180 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2181 return;
2182
2183 addrconf_addr_solict_mult(addr, &maddr);
2184 ipv6_dev_mc_inc(dev, &maddr);
2185}
2186
a9ed4a29 2187/* caller must hold RTNL */
b71d1d42 2188void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 2189{
2190 struct in6_addr maddr;
2191
2192 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2193 return;
2194
2195 addrconf_addr_solict_mult(addr, &maddr);
2196 __ipv6_dev_mc_dec(idev, &maddr);
2197}
2198
a9ed4a29 2199/* caller must hold RTNL */
20380731 2200static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2201{
2202 struct in6_addr addr;
c15b1cca 2203
88ad3149 2204 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 2205 return;
1da177e4
LT		 2206 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2207 if (ipv6_addr_any(&addr))
2208 return;
013b4d90 2209 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 2210}
2211
a9ed4a29 2212/* caller must hold RTNL */
20380731 2213static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2214{
2215 struct in6_addr addr;
c15b1cca 2216
88ad3149 2217 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 2218 return;
1da177e4
LT		 2219 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2220 if (ipv6_addr_any(&addr))
2221 return;
2222 __ipv6_dev_ac_dec(ifp->idev, &addr);
2223}
2224
8a7a4b47 2225static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
06a4c1c5 2226{
8a7a4b47
AA		 2227 switch (dev->addr_len) {
2228 case ETH_ALEN:
9dae2e03
LAD		 2229 memcpy(eui, dev->dev_addr, 3);
2230 eui[3] = 0xFF;
2231 eui[4] = 0xFE;
2232 memcpy(eui + 5, dev->dev_addr + 3, 3);
2233 break;
8a7a4b47
AA		 2234 case EUI64_ADDR_LEN:
2235 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2236 eui[0] ^= 2;
2237 break;
2238 default:
06a4c1c5 2239 return -1;
8a7a4b47
AA		 2240 }
2241
06a4c1c5 2242 return 0;
2243}
2244
cb6bf355
YH		 2245static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2246{
1a8a23d2 2247 const union fwnet_hwaddr *ha;
cb6bf355
YH		 2248
2249 if (dev->addr_len != FWNET_ALEN)
2250 return -1;
2251
1a8a23d2 2252 ha = (const union fwnet_hwaddr *)dev->dev_addr;
cb6bf355
YH		 2253
2254 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2255 eui[0] ^= 2;
2256 return 0;
2257}
2258
073a8e0e
YH		 2259static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2260{
2261 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2262 if (dev->addr_len != ARCNET_ALEN)
2263 return -1;
2264 memset(eui, 0, 7);
8e5e8f30 2265 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 2266 return 0;
2267}
2268
2269static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2270{
2271 if (dev->addr_len != INFINIBAND_ALEN)
2272 return -1;
2273 memcpy(eui, dev->dev_addr + 12, 8);
2274 eui[0] |= 2;
2275 return 0;
2276}
2277
c61393ea 2278static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2279{
9af28511
SH		 2280 if (addr == 0)
2281 return -1;
dfd982ba
YH		 2282 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2283 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2284 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2285 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2286 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2287 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2288 eui[1] = 0;
2289 eui[2] = 0x5E;
2290 eui[3] = 0xFE;
2291 memcpy(eui + 4, &addr, 4);
2292 return 0;
2293}
dfd982ba
YH		 2294
2295static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2296{
2297 if (dev->priv_flags & IFF_ISATAP)
2298 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2299 return -1;
2300}
2301
aee80b54 2302static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2303{
2304 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2305}
2306
e837735e
ND		 2307static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2308{
2309 memcpy(eui, dev->perm_addr, 3);
2310 memcpy(eui + 5, dev->perm_addr + 3, 3);
2311 eui[3] = 0xFF;
2312 eui[4] = 0xFE;
2313 eui[0] ^= 2;
2314 return 0;
2315}
2316
1da177e4
LT		 2317static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2318{
2319 switch (dev->type) {
2320 case ARPHRD_ETHER:
2321 case ARPHRD_FDDI:
073a8e0e 2322 return addrconf_ifid_eui48(eui, dev);
1da177e4 2323 case ARPHRD_ARCNET:
073a8e0e 2324 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2325 case ARPHRD_INFINIBAND:
073a8e0e 2326 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2327 case ARPHRD_SIT:
dfd982ba 2328 return addrconf_ifid_sit(eui, dev);
aee80b54 2329 case ARPHRD_IPGRE:
45ce0fd1 2330 case ARPHRD_TUNNEL:
aee80b54 2331 return addrconf_ifid_gre(eui, dev);
e74bccb8 2332 case ARPHRD_6LOWPAN:
8a7a4b47 2333 return addrconf_ifid_6lowpan(eui, dev);
cb6bf355
YH		 2334 case ARPHRD_IEEE1394:
2335 return addrconf_ifid_ieee1394(eui, dev);
e837735e 2336 case ARPHRD_TUNNEL6:
45ce0fd1 2337 case ARPHRD_IP6GRE:
9deb441c 2338 case ARPHRD_RAWIP:
e837735e 2339 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2340 }
2341 return -1;
2342}
2343
2344static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2345{
2346 int err = -1;
2347 struct inet6_ifaddr *ifp;
2348
2349 read_lock_bh(&idev->lock);
602582ca
HFS		 2350 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2351 if (ifp->scope > IFA_LINK)
2352 break;
1da177e4
LT		 2353 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2354 memcpy(eui, ifp->addr.s6_addr+8, 8);
2355 err = 0;
2356 break;
2357 }
2358 }
2359 read_unlock_bh(&idev->lock);
2360 return err;
2361}
2362
969c5464
FG		 2363/* Generation of a randomized Interface Identifier
2364 * draft-ietf-6man-rfc4941bis, Section 3.3.1
2365 */
2366
2367static void ipv6_gen_rnd_iid(struct in6_addr *addr)
1da177e4 2368{
1da177e4 2369regen:
969c5464 2370 get_random_bytes(&addr->s6_addr[8], 8);
1da177e4 2371
969c5464
FG		 2372 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1:
2373 * check if generated address is not inappropriate:
1da177e4 2374 *
912b519a 2375 * - Reserved IPv6 Interface Identifiers
969c5464 2376 * - XXX: already assigned to an address on the device
1da177e4 2377 */
969c5464
FG		 2378
2379 /* Subnet-router anycast: 0000:0000:0000:0000 */
2380 if (!(addr->s6_addr32[2] | addr->s6_addr32[3]))
1da177e4 2381 goto regen;
1da177e4 2382
969c5464
FG		 2383 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212
2384 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213
2385 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF
2386 */
2387 if (ntohl(addr->s6_addr32[2]) == 0x02005eff &&
2388 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000)
2389 goto regen;
2390
2391 /* Reserved subnet anycast addresses */
2392 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff &&
2393 ntohl(addr->s6_addr32[3]) >= 0Xffffff80)
2394 goto regen;
1da177e4 2395}
1da177e4
LT		 2396
2397/*
2398 * Add prefix route.
2399 */
2400
2401static void
8308f3ff
DA		 2402addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2403 struct net_device *dev, unsigned long expires,
2404 u32 flags, gfp_t gfp_flags)
1da177e4 2405{
86872cb5 2406 struct fib6_config cfg = {
ca254490 2407 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
8308f3ff 2408 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
86872cb5
TG		 2409 .fc_ifindex = dev->ifindex,
2410 .fc_expires = expires,
2411 .fc_dst_len = plen,
2412 .fc_flags = RTF_UP | flags,
c346dca1 2413 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2414 .fc_protocol = RTPROT_KERNEL,
e8478e80 2415 .fc_type = RTN_UNICAST,
86872cb5 2416 };
1da177e4 2417
4e3fd7a0 2418 cfg.fc_dst = *pfx;
1da177e4
LT		 2419
2420 /* Prevent useless cloning on PtP SIT.
2421 This thing is done here expecting that the whole
2422 class of non-broadcast devices need not cloning.
2423 */
07a93626 2424#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2425 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2426 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2427#endif
1da177e4 2428
acb54e3c 2429 ip6_route_add(&cfg, gfp_flags, NULL);
1da177e4
LT		 2430}
2431
14ef37b6 2432
8d1c802b 2433static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
14ef37b6
AH		 2434 int plen,
2435 const struct net_device *dev,
2b2450ca
DA		 2436 u32 flags, u32 noflags,
2437 bool no_gw)
14ef37b6
AH		 2438{
2439 struct fib6_node *fn;
8d1c802b 2440 struct fib6_info *rt = NULL;
14ef37b6 2441 struct fib6_table *table;
ca254490 2442 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2443
ca254490 2444 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2445 if (!table)
14ef37b6
AH		 2446 return NULL;
2447
66f5d6ce 2448 rcu_read_lock();
38fbeeee 2449 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
14ef37b6
AH		 2450 if (!fn)
2451 goto out;
1f56a01f 2452
66f5d6ce 2453 for_each_fib6_node_rt_rcu(fn) {
f88d8ea6
DA		 2454 /* prefix routes only use builtin fib6_nh */
2455 if (rt->nh)
2456 continue;
2457
1cf844c7 2458 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
14ef37b6 2459 continue;
1cf844c7 2460 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2b2450ca 2461 continue;
93c2fb25 2462 if ((rt->fib6_flags & flags) != flags)
14ef37b6 2463 continue;
93c2fb25 2464 if ((rt->fib6_flags & noflags) != 0)
14ef37b6 2465 continue;
e873e4b9
WW		 2466 if (!fib6_info_hold_safe(rt))
2467 continue;
14ef37b6
AH		 2468 break;
2469 }
2470out:
66f5d6ce 2471 rcu_read_unlock();
14ef37b6
AH		 2472 return rt;
2473}
2474
2475
1da177e4
LT		 2476/* Create "default" multicast route to the interface */
2477
2478static void addrconf_add_mroute(struct net_device *dev)
2479{
86872cb5 2480 struct fib6_config cfg = {
ca254490 2481 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2482 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2483 .fc_ifindex = dev->ifindex,
2484 .fc_dst_len = 8,
2485 .fc_flags = RTF_UP,
ceed9038 2486 .fc_type = RTN_MULTICAST,
c346dca1 2487 .fc_nlinfo.nl_net = dev_net(dev),
a826b043 2488 .fc_protocol = RTPROT_KERNEL,
86872cb5
TG		 2489 };
2490
2491 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2492
e500c6d3 2493 ip6_route_add(&cfg, GFP_KERNEL, NULL);
1da177e4
LT		 2494}
2495
1da177e4
LT		 2496static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2497{
2498 struct inet6_dev *idev;
2499
2500 ASSERT_RTNL();
2501
e21e8467 2502 idev = ipv6_find_idev(dev);
db0b99f5
SD		 2503 if (IS_ERR(idev))
2504 return idev;
64e724f6
BH		 2505
2506 if (idev->cnf.disable_ipv6)
2507 return ERR_PTR(-EACCES);
1da177e4
LT		 2508
2509 /* Add default multicast route */
ba46ee4c 2510 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
4af04aba 2511 addrconf_add_mroute(dev);
1da177e4 2512
1da177e4
LT		 2513 return idev;
2514}
2515
53bd6749
JP		 2516static void manage_tempaddrs(struct inet6_dev *idev,
2517 struct inet6_ifaddr *ifp,
2518 __u32 valid_lft, __u32 prefered_lft,
2519 bool create, unsigned long now)
2520{
2521 u32 flags;
2522 struct inet6_ifaddr *ift;
2523
2524 read_lock_bh(&idev->lock);
2525 /* update all temporary addresses in the list */
2526 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2527 int age, max_valid, max_prefered;
2528
2529 if (ifp != ift->ifpub)
2530 continue;
2531
2532 /* RFC 4941 section 3.3:
2533 * If a received option will extend the lifetime of a public
2534 * address, the lifetimes of temporary addresses should
2535 * be extended, subject to the overall constraint that no
2536 * temporary addresses should ever remain "valid" or "preferred"
2537 * for a time longer than (TEMP_VALID_LIFETIME) or
2538 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2539 */
2540 age = (now - ift->cstamp) / HZ;
2541 max_valid = idev->cnf.temp_valid_lft - age;
2542 if (max_valid < 0)
2543 max_valid = 0;
2544
2545 max_prefered = idev->cnf.temp_prefered_lft -
76506a98 2546 idev->desync_factor - age;
53bd6749
JP		 2547 if (max_prefered < 0)
2548 max_prefered = 0;
2549
2550 if (valid_lft > max_valid)
2551 valid_lft = max_valid;
2552
2553 if (prefered_lft > max_prefered)
2554 prefered_lft = max_prefered;
2555
2556 spin_lock(&ift->lock);
2557 flags = ift->flags;
2558 ift->valid_lft = valid_lft;
2559 ift->prefered_lft = prefered_lft;
2560 ift->tstamp = now;
2561 if (prefered_lft > 0)
2562 ift->flags &= ~IFA_F_DEPRECATED;
2563
2564 spin_unlock(&ift->lock);
2565 if (!(flags&IFA_F_TENTATIVE))
2566 ipv6_ifa_notify(0, ift);
2567 }
2568
2569 if ((create || list_empty(&idev->tempaddr_list)) &&
2570 idev->cnf.use_tempaddr > 0) {
2571 /* When a new public address is created as described
2572 * in [ADDRCONF], also create a new temporary address.
2573 * Also create a temporary address if it's enabled but
2574 * no temporary address currently exists.
2575 */
2576 read_unlock_bh(&idev->lock);
969c5464 2577 ipv6_create_tempaddr(ifp, false);
53bd6749
JP		 2578 } else {
2579 read_unlock_bh(&idev->lock);
2580 }
2581}
2582
cc9da6cc
BM		 2583static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2584{
d35a00b8
FJ		 2585 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2586 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc
BM		 2587}
2588
cc84b3c6
AA		 2589int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2590 const struct prefix_info *pinfo,
2591 struct inet6_dev *in6_dev,
2592 const struct in6_addr *addr, int addr_type,
2593 u32 addr_flags, bool sllao, bool tokenized,
2594 __u32 valid_lft, u32 prefered_lft)
4f672235
AA		 2595{
2596 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
36268983 2597 int create = 0, update_lft = 0;
4f672235
AA		 2598
2599 if (!ifp && valid_lft) {
2600 int max_addresses = in6_dev->cnf.max_addresses;
e6464b8c
DA		 2601 struct ifa6_config cfg = {
2602 .pfx = addr,
2603 .plen = pinfo->prefix_len,
2604 .ifa_flags = addr_flags,
2605 .valid_lft = valid_lft,
2606 .preferred_lft = prefered_lft,
2607 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
47f0bd50 2608 .ifa_proto = IFAPROT_KERNEL_RA
e6464b8c 2609 };
4f672235
AA		 2610
2611#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 2612 if ((net->ipv6.devconf_all->optimistic_dad ||
2613 in6_dev->cnf.optimistic_dad) &&
4f672235 2614 !net->ipv6.devconf_all->forwarding && sllao)
e6464b8c 2615 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
4f672235
AA		 2616#endif
2617
2618 /* Do not allow to create too much of autoconfigured
2619 * addresses; this would be too easy way to crash kernel.
2620 */
2621 if (!max_addresses ||
2622 ipv6_count_addresses(in6_dev) < max_addresses)
e6464b8c 2623 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
4f672235
AA		 2624
2625 if (IS_ERR_OR_NULL(ifp))
2626 return -1;
2627
4f672235
AA		 2628 create = 1;
2629 spin_lock_bh(&ifp->lock);
2630 ifp->flags |= IFA_F_MANAGETEMPADDR;
2631 ifp->cstamp = jiffies;
2632 ifp->tokenized = tokenized;
2633 spin_unlock_bh(&ifp->lock);
2634 addrconf_dad_start(ifp);
2635 }
2636
2637 if (ifp) {
2638 u32 flags;
2639 unsigned long now;
2640 u32 stored_lft;
2641
36268983 2642 /* update lifetime (RFC2462 5.5.3 e) */
4f672235
AA		 2643 spin_lock_bh(&ifp->lock);
2644 now = jiffies;
2645 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2646 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2647 else
2648 stored_lft = 0;
b75326c2 2649 if (!create && stored_lft) {
36268983
GN		 2650 const u32 minimum_lft = min_t(u32,
2651 stored_lft, MIN_VALID_LIFETIME);
2652 valid_lft = max(valid_lft, minimum_lft);
2653
2654 /* RFC4862 Section 5.5.3e:
2655 * "Note that the preferred lifetime of the
2656 * corresponding address is always reset to
2657 * the Preferred Lifetime in the received
2658 * Prefix Information option, regardless of
2659 * whether the valid lifetime is also reset or
2660 * ignored."
2661 *
2662 * So we should always update prefered_lft here.
2663 */
2664 update_lft = 1;
2665 }
2666
2667 if (update_lft) {
4f672235
AA		 2668 ifp->valid_lft = valid_lft;
2669 ifp->prefered_lft = prefered_lft;
2670 ifp->tstamp = now;
2671 flags = ifp->flags;
2672 ifp->flags &= ~IFA_F_DEPRECATED;
2673 spin_unlock_bh(&ifp->lock);
2674
2675 if (!(flags&IFA_F_TENTATIVE))
2676 ipv6_ifa_notify(0, ifp);
2677 } else
2678 spin_unlock_bh(&ifp->lock);
2679
2680 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2681 create, now);
2682
2683 in6_ifa_put(ifp);
8805d13f 2684 addrconf_verify(net);
4f672235
AA		 2685 }
2686
2687 return 0;
2688}
cc84b3c6 2689EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
4f672235 2690
e6bff995 2691void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2692{
2693 struct prefix_info *pinfo;
2694 __u32 valid_lft;
2695 __u32 prefered_lft;
4f672235 2696 int addr_type, err;
64236f3f 2697 u32 addr_flags = 0;
1da177e4 2698 struct inet6_dev *in6_dev;
56d417b1 2699 struct net *net = dev_net(dev);
1da177e4
LT		 2700
2701 pinfo = (struct prefix_info *) opt;
1ab1457c 2702
1da177e4 2703 if (len < sizeof(struct prefix_info)) {
e32ac250 2704 netdev_dbg(dev, "addrconf: prefix option too short\n");
1da177e4
LT		 2705 return;
2706 }
1ab1457c 2707
1da177e4
LT		 2708 /*
2709 * Validation checks ([ADDRCONF], page 19)
2710 */
2711
2712 addr_type = ipv6_addr_type(&pinfo->prefix);
2713
2714 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2715 return;
2716
2717 valid_lft = ntohl(pinfo->valid);
2718 prefered_lft = ntohl(pinfo->prefered);
2719
2720 if (prefered_lft > valid_lft) {
e87cc472 2721 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2722 return;
2723 }
2724
2725 in6_dev = in6_dev_get(dev);
2726
63159f29 2727 if (!in6_dev) {
e87cc472
JP		 2728 net_dbg_ratelimited("addrconf: device %s not configured\n",
2729 dev->name);
1da177e4
LT		 2730 return;
2731 }
2732
2733 /*
2734 * Two things going on here:
2735 * 1) Add routes for on-link prefixes
2736 * 2) Configure prefixes with the auto flag set
2737 */
2738
4bed72e4 2739 if (pinfo->onlink) {
8d1c802b 2740 struct fib6_info *rt;
4bed72e4
YH		 2741 unsigned long rt_expires;
2742
6f704992
YH		 2743 /* Avoid arithmetic overflow. Really, we could
2744 * save rt_expires in seconds, likely valid_lft,
2745 * but it would require division in fib gc, that it
2746 * not good.
2747 */
4bed72e4
YH		 2748 if (HZ > USER_HZ)
2749 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2750 else
2751 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2752
4bed72e4
YH		 2753 if (addrconf_finite_timeout(rt_expires))
2754 rt_expires *= HZ;
1da177e4 2755
14ef37b6
AH		 2756 rt = addrconf_get_prefix_route(&pinfo->prefix,
2757 pinfo->prefix_len,
2758 dev,
2759 RTF_ADDRCONF | RTF_PREFIX_RT,
2b2450ca 2760 RTF_DEFAULT, true);
1da177e4 2761
14ef37b6 2762 if (rt) {
6f704992
YH		 2763 /* Autoconf prefix route */
2764 if (valid_lft == 0) {
11dd74b3 2765 ip6_del_rt(net, rt, false);
6f704992 2766 rt = NULL;
4bed72e4 2767 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2768 /* not infinity */
14895687 2769 fib6_set_expires(rt, jiffies + rt_expires);
6f704992 2770 } else {
14895687 2771 fib6_clean_expires(rt);
1da177e4
LT		 2772 }
2773 } else if (valid_lft) {
6f704992 2774 clock_t expires = 0;
4bed72e4
YH		 2775 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2776 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2777 /* not infinity */
2778 flags |= RTF_EXPIRES;
2779 expires = jiffies_to_clock_t(rt_expires);
2780 }
1da177e4 2781 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
8308f3ff
DA		 2782 0, dev, expires, flags,
2783 GFP_ATOMIC);
1da177e4 2784 }
93531c67 2785 fib6_info_release(rt);
1da177e4
LT		 2786 }
2787
2788 /* Try to figure out our local address for this prefix */
2789
2790 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1da177e4 2791 struct in6_addr addr;
f997c55c 2792 bool tokenized = false, dev_addr_generated = false;
1da177e4
LT		 2793
2794 if (pinfo->prefix_len == 64) {
2795 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2796
2797 if (!ipv6_addr_any(&in6_dev->token)) {
2798 read_lock_bh(&in6_dev->lock);
2799 memcpy(addr.s6_addr + 8,
2800 in6_dev->token.s6_addr + 8, 8);
2801 read_unlock_bh(&in6_dev->lock);
617fe29d 2802 tokenized = true;
cc9da6cc 2803 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2804 !ipv6_generate_stable_address(&addr, 0,
2805 in6_dev)) {
64236f3f 2806 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2807 goto ok;
f53adae4
DB		 2808 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2809 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
4f672235 2810 goto put;
f997c55c
AA		 2811 } else {
2812 dev_addr_generated = true;
1da177e4
LT		 2813 }
2814 goto ok;
2815 }
e87cc472
JP		 2816 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2817 pinfo->prefix_len);
4f672235 2818 goto put;
1da177e4
LT		 2819
2820ok:
4f672235
AA		 2821 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2822 &addr, addr_type,
2823 addr_flags, sllao,
2824 tokenized, valid_lft,
2825 prefered_lft);
2826 if (err)
2827 goto put;
f997c55c
AA		 2828
2829 /* Ignore error case here because previous prefix add addr was
2830 * successful which will be notified.
2831 */
2832 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2833 addr_type, addr_flags, sllao,
2834 tokenized, valid_lft,
2835 prefered_lft,
2836 dev_addr_generated);
1da177e4
LT		 2837 }
2838 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
4f672235 2839put:
1da177e4
LT		 2840 in6_dev_put(in6_dev);
2841}
2842
68ad6886
CH		 2843static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
2844 struct in6_ifreq *ireq)
2845{
2846 struct ip_tunnel_parm p = { };
68ad6886
CH		 2847 int err;
2848
2849 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
2850 return -EADDRNOTAVAIL;
2851
2852 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3];
2853 p.iph.version = 4;
2854 p.iph.ihl = 5;
2855 p.iph.protocol = IPPROTO_IPV6;
2856 p.iph.ttl = 64;
68ad6886 2857
8e3db0bb 2858 if (!dev->netdev_ops->ndo_tunnel_ctl)
68ad6886 2859 return -EOPNOTSUPP;
8e3db0bb 2860 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
68ad6886
CH		 2861 if (err)
2862 return err;
2863
2864 dev = __dev_get_by_name(net, p.name);
2865 if (!dev)
2866 return -ENOBUFS;
2867 return dev_open(dev, NULL);
2868}
2869
1da177e4
LT		 2870/*
2871 * Set destination address.
2872 * Special case for SIT interfaces where we create a new "virtual"
2873 * device.
2874 */
af284937 2875int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4 2876{
1da177e4 2877 struct net_device *dev;
68ad6886
CH		 2878 struct in6_ifreq ireq;
2879 int err = -ENODEV;
1da177e4 2880
f0988460
CH		 2881 if (!IS_ENABLED(CONFIG_IPV6_SIT))
2882 return -ENODEV;
1da177e4 2883 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
68ad6886 2884 return -EFAULT;
1da177e4 2885
68ad6886 2886 rtnl_lock();
af284937 2887 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
68ad6886
CH		 2888 if (dev && dev->type == ARPHRD_SIT)
2889 err = addrconf_set_sit_dstaddr(net, dev, &ireq);
1da177e4
LT		 2890 rtnl_unlock();
2891 return err;
2892}
2893
93a714d6
MC		 2894static int ipv6_mc_config(struct sock *sk, bool join,
2895 const struct in6_addr *addr, int ifindex)
2896{
2897 int ret;
2898
2899 ASSERT_RTNL();
2900
2901 lock_sock(sk);
2902 if (join)
54ff9ef3 2903 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2904 else
54ff9ef3 2905 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2906 release_sock(sk);
2907
2908 return ret;
2909}
2910
1da177e4
LT		 2911/*
2912 * Manual configuration of address on an interface
2913 */
479840ff 2914static int inet6_addr_add(struct net *net, int ifindex,
19b1518c 2915 struct ifa6_config *cfg,
de95e047 2916 struct netlink_ext_ack *extack)
1da177e4
LT		 2917{
2918 struct inet6_ifaddr *ifp;
2919 struct inet6_dev *idev;
2920 struct net_device *dev;
93a714d6
MC		 2921 unsigned long timeout;
2922 clock_t expires;
6f704992 2923 u32 flags;
1da177e4
LT		 2924
2925 ASSERT_RTNL();
1ab1457c 2926
19b1518c 2927 if (cfg->plen > 128)
24ef0da7
TG		 2928 return -EINVAL;
2929
0778769d 2930 /* check the lifetime */
19b1518c 2931 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
0778769d
NT		 2932 return -EINVAL;
2933
19b1518c 2934 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
53bd6749
JP		 2935 return -EINVAL;
2936
af284937
DL		 2937 dev = __dev_get_by_index(net, ifindex);
2938 if (!dev)
1da177e4 2939 return -ENODEV;
1ab1457c 2940
64e724f6
BH		 2941 idev = addrconf_add_dev(dev);
2942 if (IS_ERR(idev))
2943 return PTR_ERR(idev);
1da177e4 2944
19b1518c 2945 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
93a714d6 2946 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
19b1518c 2947 true, cfg->pfx, ifindex);
93a714d6
MC		 2948
2949 if (ret < 0)
2950 return ret;
2951 }
2952
19b1518c 2953 cfg->scope = ipv6_addr_scope(cfg->pfx);
1da177e4 2954
19b1518c 2955 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4bed72e4
YH		 2956 if (addrconf_finite_timeout(timeout)) {
2957 expires = jiffies_to_clock_t(timeout * HZ);
19b1518c 2958 cfg->valid_lft = timeout;
6f704992 2959 flags = RTF_EXPIRES;
4bed72e4
YH		 2960 } else {
2961 expires = 0;
2962 flags = 0;
19b1518c 2963 cfg->ifa_flags |= IFA_F_PERMANENT;
6f704992 2964 }
0778769d 2965
19b1518c 2966 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4bed72e4
YH		 2967 if (addrconf_finite_timeout(timeout)) {
2968 if (timeout == 0)
19b1518c
DA		 2969 cfg->ifa_flags |= IFA_F_DEPRECATED;
2970 cfg->preferred_lft = timeout;
4bed72e4 2971 }
0778769d 2972
19b1518c 2973 ifp = ipv6_add_addr(idev, cfg, true, extack);
1da177e4 2974 if (!IS_ERR(ifp)) {
19b1518c 2975 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
8308f3ff
DA		 2976 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2977 ifp->rt_priority, dev, expires,
2978 flags, GFP_KERNEL);
761aac73
TH		 2979 }
2980
a2d481b3
LB		 2981 /* Send a netlink notification if DAD is enabled and
2982 * optimistic flag is not set
2983 */
2984 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2985 ipv6_ifa_notify(0, ifp);
95c385b4
NH		 2986 /*
2987 * Note that section 3.1 of RFC 4429 indicates
2988 * that the Optimistic flag should not be set for
2989 * manually configured addresses
2990 */
cf22f9a2 2991 addrconf_dad_start(ifp);
19b1518c
DA		 2992 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2993 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2994 cfg->preferred_lft, true, jiffies);
1da177e4 2995 in6_ifa_put(ifp);
8805d13f 2996 addrconf_verify_rtnl(net);
1da177e4 2997 return 0;
19b1518c
DA		 2998 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2999 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
3000 cfg->pfx, ifindex);
1da177e4
LT		 3001 }
3002
3003 return PTR_ERR(ifp);
3004}
3005
6046d5b4
HK		 3006static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
3007 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 3008{
3009 struct inet6_ifaddr *ifp;
3010 struct inet6_dev *idev;
3011 struct net_device *dev;
1ab1457c 3012
24ef0da7
TG		 3013 if (plen > 128)
3014 return -EINVAL;
3015
af284937
DL		 3016 dev = __dev_get_by_index(net, ifindex);
3017 if (!dev)
1da177e4
LT		 3018 return -ENODEV;
3019
e5d08d71 3020 idev = __in6_dev_get(dev);
63159f29 3021 if (!idev)
1da177e4
LT		 3022 return -ENXIO;
3023
3024 read_lock_bh(&idev->lock);
502a2ffd 3025 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 3026 if (ifp->prefix_len == plen &&
3027 ipv6_addr_equal(pfx, &ifp->addr)) {
3028 in6_ifa_hold(ifp);
3029 read_unlock_bh(&idev->lock);
1ab1457c 3030
6046d5b4
HK		 3031 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3032 (ifa_flags & IFA_F_MANAGETEMPADDR))
3033 manage_tempaddrs(idev, ifp, 0, 0, false,
3034 jiffies);
1da177e4 3035 ipv6_del_addr(ifp);
8805d13f 3036 addrconf_verify_rtnl(net);
93a714d6
MC		 3037 if (ipv6_addr_is_multicast(pfx)) {
3038 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3039 false, pfx, dev->ifindex);
3040 }
1da177e4
LT		 3041 return 0;
3042 }
3043 }
3044 read_unlock_bh(&idev->lock);
3045 return -EADDRNOTAVAIL;
3046}
3047
3048
af284937 3049int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4 3050{
19b1518c
DA		 3051 struct ifa6_config cfg = {
3052 .ifa_flags = IFA_F_PERMANENT,
3053 .preferred_lft = INFINITY_LIFE_TIME,
3054 .valid_lft = INFINITY_LIFE_TIME,
3055 };
1da177e4
LT		 3056 struct in6_ifreq ireq;
3057 int err;
1ab1457c 3058
af31f412 3059 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 3060 return -EPERM;
1ab1457c 3061
1da177e4
LT		 3062 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3063 return -EFAULT;
3064
19b1518c
DA		 3065 cfg.pfx = &ireq.ifr6_addr;
3066 cfg.plen = ireq.ifr6_prefixlen;
3067
1da177e4 3068 rtnl_lock();
19b1518c 3069 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
1da177e4
LT		 3070 rtnl_unlock();
3071 return err;
3072}
3073
af284937 3074int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 3075{
3076 struct in6_ifreq ireq;
3077 int err;
1ab1457c 3078
af31f412 3079 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 3080 return -EPERM;
3081
3082 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3083 return -EFAULT;
3084
3085 rtnl_lock();
6046d5b4 3086 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 3087 ireq.ifr6_prefixlen);
1da177e4
LT		 3088 rtnl_unlock();
3089 return err;
3090}
3091
b5f348e5 3092static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
47f0bd50 3093 int plen, int scope, u8 proto)
b5f348e5
IJ		 3094{
3095 struct inet6_ifaddr *ifp;
e6464b8c
DA		 3096 struct ifa6_config cfg = {
3097 .pfx = addr,
3098 .plen = plen,
3099 .ifa_flags = IFA_F_PERMANENT,
3100 .valid_lft = INFINITY_LIFE_TIME,
3101 .preferred_lft = INFINITY_LIFE_TIME,
47f0bd50
JL		 3102 .scope = scope,
3103 .ifa_proto = proto
e6464b8c 3104 };
b5f348e5 3105
e6464b8c 3106 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
b5f348e5
IJ		 3107 if (!IS_ERR(ifp)) {
3108 spin_lock_bh(&ifp->lock);
3109 ifp->flags &= ~IFA_F_TENTATIVE;
3110 spin_unlock_bh(&ifp->lock);
764d3be6 3111 rt_genid_bump_ipv6(dev_net(idev->dev));
b5f348e5
IJ		 3112 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3113 in6_ifa_put(ifp);
3114 }
3115}
3116
e5dd7294
AQ		 3117#if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3118static void add_v4_addrs(struct inet6_dev *idev)
1da177e4 3119{
1da177e4
LT		 3120 struct in6_addr addr;
3121 struct net_device *dev;
c346dca1 3122 struct net *net = dev_net(idev->dev);
e5dd7294 3123 int scope, plen, offset = 0;
f0e2acfa 3124 u32 pflags = 0;
1da177e4
LT		 3125
3126 ASSERT_RTNL();
3127
3128 memset(&addr, 0, sizeof(struct in6_addr));
e5dd7294
AQ		 3129 /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */
3130 if (idev->dev->addr_len == sizeof(struct in6_addr))
3131 offset = sizeof(struct in6_addr) - 4;
3132 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4);
1da177e4
LT		 3133
3134 if (idev->dev->flags&IFF_POINTOPOINT) {
61e18ce7
SS		 3135 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE)
3136 return;
3137
1da177e4
LT		 3138 addr.s6_addr32[0] = htonl(0xfe800000);
3139 scope = IFA_LINK;
929c9cf3 3140 plen = 64;
1da177e4
LT		 3141 } else {
3142 scope = IPV6_ADDR_COMPATv4;
929c9cf3 3143 plen = 96;
f0e2acfa 3144 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 3145 }
3146
3147 if (addr.s6_addr32[3]) {
47f0bd50 3148 add_addr(idev, &addr, plen, scope, IFAPROT_UNSPEC);
8308f3ff 3149 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
e500c6d3 3150 GFP_KERNEL);
1da177e4
LT		 3151 return;
3152 }
3153
6fda7350 3154 for_each_netdev(net, dev) {
8e5e8f30 3155 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 3156 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 3157 struct in_ifaddr *ifa;
1da177e4
LT		 3158 int flag = scope;
3159
cd5a411d 3160 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1da177e4
LT		 3161 addr.s6_addr32[3] = ifa->ifa_local;
3162
3163 if (ifa->ifa_scope == RT_SCOPE_LINK)
3164 continue;
3165 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3166 if (idev->dev->flags&IFF_POINTOPOINT)
3167 continue;
3168 flag |= IFA_HOST;
3169 }
1da177e4 3170
47f0bd50
JL		 3171 add_addr(idev, &addr, plen, flag,
3172 IFAPROT_UNSPEC);
8308f3ff 3173 addrconf_prefix_route(&addr, plen, 0, idev->dev,
e500c6d3 3174 0, pflags, GFP_KERNEL);
1da177e4
LT		 3175 }
3176 }
1ab1457c 3177 }
1da177e4 3178}
0be669bb 3179#endif
1da177e4
LT		 3180
3181static void init_loopback(struct net_device *dev)
3182{
3183 struct inet6_dev *idev;
1da177e4
LT		 3184
3185 /* ::1 */
3186
3187 ASSERT_RTNL();
3188
e5d08d71 3189 idev = ipv6_find_idev(dev);
db0b99f5 3190 if (IS_ERR(idev)) {
91df42be 3191 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3192 return;
3193 }
3194
47f0bd50 3195 add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFAPROT_KERNEL_LO);
1da177e4
LT		 3196}
3197
2ad3ed59
AA		 3198void addrconf_add_linklocal(struct inet6_dev *idev,
3199 const struct in6_addr *addr, u32 flags)
1da177e4 3200{
e6464b8c
DA		 3201 struct ifa6_config cfg = {
3202 .pfx = addr,
3203 .plen = 64,
3204 .ifa_flags = flags | IFA_F_PERMANENT,
3205 .valid_lft = INFINITY_LIFE_TIME,
3206 .preferred_lft = INFINITY_LIFE_TIME,
47f0bd50
JL		 3207 .scope = IFA_LINK,
3208 .ifa_proto = IFAPROT_KERNEL_LL
e6464b8c 3209 };
8e5e8f30 3210 struct inet6_ifaddr *ifp;
95c385b4
NH		 3211
3212#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 3213 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3214 idev->cnf.optimistic_dad) &&
702beb87 3215 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
e6464b8c 3216 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
95c385b4 3217#endif
1da177e4 3218
e6464b8c 3219 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
1da177e4 3220 if (!IS_ERR(ifp)) {
8308f3ff 3221 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
acb54e3c 3222 0, 0, GFP_ATOMIC);
cf22f9a2 3223 addrconf_dad_start(ifp);
1da177e4
LT		 3224 in6_ifa_put(ifp);
3225 }
3226}
2ad3ed59 3227EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
1da177e4 3228
622c81d5
HFS		 3229static bool ipv6_reserved_interfaceid(struct in6_addr address)
3230{
3231 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3232 return true;
3233
3234 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3235 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3236 return true;
3237
3238 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3239 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3240 return true;
3241
3242 return false;
3243}
3244
3245static int ipv6_generate_stable_address(struct in6_addr *address,
3246 u8 dad_count,
3247 const struct inet6_dev *idev)
3248{
622c81d5 3249 static DEFINE_SPINLOCK(lock);
6b0b0fa2
EB		 3250 static __u32 digest[SHA1_DIGEST_WORDS];
3251 static __u32 workspace[SHA1_WORKSPACE_WORDS];
622c81d5
HFS		 3252
3253 static union {
6b0b0fa2 3254 char __data[SHA1_BLOCK_SIZE];
622c81d5
HFS		 3255 struct {
3256 struct in6_addr secret;
ff40217e 3257 __be32 prefix[2];
622c81d5
HFS		 3258 unsigned char hwaddr[MAX_ADDR_LEN];
3259 u8 dad_count;
3260 } __packed;
3261 } data;
3262
3263 struct in6_addr secret;
3264 struct in6_addr temp;
3265 struct net *net = dev_net(idev->dev);
3266
3267 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3268
3269 if (idev->cnf.stable_secret.initialized)
3270 secret = idev->cnf.stable_secret.secret;
3271 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3272 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3273 else
3274 return -1;
3275
3276retry:
3277 spin_lock_bh(&lock);
3278
6b0b0fa2 3279 sha1_init(digest);
622c81d5
HFS		 3280 memset(&data, 0, sizeof(data));
3281 memset(workspace, 0, sizeof(workspace));
3282 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3283 data.prefix[0] = address->s6_addr32[0];
3284 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3285 data.secret = secret;
3286 data.dad_count = dad_count;
3287
6b0b0fa2 3288 sha1_transform(digest, data.__data, workspace);
622c81d5
HFS		 3289
3290 temp = *address;
ff40217e
HFS		 3291 temp.s6_addr32[2] = (__force __be32)digest[0];
3292 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3293
3294 spin_unlock_bh(&lock);
3295
3296 if (ipv6_reserved_interfaceid(temp)) {
3297 dad_count++;
1855b7c3 3298 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3299 return -1;
3300 goto retry;
3301 }
3302
3303 *address = temp;
3304 return 0;
3305}
3306
cc9da6cc
BM		 3307static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3308{
3309 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3310
3311 if (s->initialized)
3312 return;
3313 s = &idev->cnf.stable_secret;
3314 get_random_bytes(&s->secret, sizeof(s->secret));
3315 s->initialized = true;
3316}
3317
bc91b0f0
JP		 3318static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3319{
622c81d5
HFS		 3320 struct in6_addr addr;
3321
ca254490
DA		 3322 /* no link local addresses on L3 master devices */
3323 if (netif_is_l3_master(idev->dev))
3324 return;
3325
744fdc82
JW		 3326 /* no link local addresses on devices flagged as slaves */
3327 if (idev->dev->flags & IFF_SLAVE)
3328 return;
3329
622c81d5 3330 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3331
d35a00b8 3332 switch (idev->cnf.addr_gen_mode) {
cc9da6cc
BM		 3333 case IN6_ADDR_GEN_MODE_RANDOM:
3334 ipv6_gen_mode_random_init(idev);
a8eceea8 3335 fallthrough;
cc9da6cc 3336 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3337 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3338 addrconf_add_linklocal(idev, &addr,
3339 IFA_F_STABLE_PRIVACY);
622c81d5 3340 else if (prefix_route)
8308f3ff 3341 addrconf_prefix_route(&addr, 64, 0, idev->dev,
acb54e3c 3342 0, 0, GFP_KERNEL);
cc9da6cc
BM		 3343 break;
3344 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3345 /* addrconf_add_linklocal also adds a prefix_route and we
3346 * only need to care about prefix routes if ipv6_generate_eui64
3347 * couldn't generate one.
3348 */
3349 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3350 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0 3351 else if (prefix_route)
8308f3ff 3352 addrconf_prefix_route(&addr, 64, 0, idev->dev,
27b10608 3353 0, 0, GFP_KERNEL);
cc9da6cc
BM		 3354 break;
3355 case IN6_ADDR_GEN_MODE_NONE:
3356 default:
3357 /* will not add any link local address */
3358 break;
bc91b0f0
JP		 3359 }
3360}
3361
1da177e4
LT		 3362static void addrconf_dev_config(struct net_device *dev)
3363{
8e5e8f30 3364 struct inet6_dev *idev;
1da177e4
LT		 3365
3366 ASSERT_RTNL();
3367
74235a25
HX		 3368 if ((dev->type != ARPHRD_ETHER) &&
3369 (dev->type != ARPHRD_FDDI) &&
74235a25 3370 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3371 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3372 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3373 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc 3374 (dev->type != ARPHRD_6LOWPAN) &&
45ce0fd1 3375 (dev->type != ARPHRD_TUNNEL) &&
9deb441c
SAK		 3376 (dev->type != ARPHRD_NONE) &&
3377 (dev->type != ARPHRD_RAWIP)) {
74235a25 3378 /* Alas, we support only Ethernet autoconfiguration. */
60380488
HL		 3379 idev = __in6_dev_get(dev);
3380 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3381 dev->flags & IFF_MULTICAST)
3382 ipv6_mc_up(idev);
74235a25
HX		 3383 return;
3384 }
3385
1da177e4 3386 idev = addrconf_add_dev(dev);
64e724f6 3387 if (IS_ERR(idev))
1da177e4
LT		 3388 return;
3389
cc9da6cc
BM		 3390 /* this device type has no EUI support */
3391 if (dev->type == ARPHRD_NONE &&
d35a00b8
FJ		 3392 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3393 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc 3394
bc91b0f0 3395 addrconf_addr_gen(idev, false);
1da177e4
LT		 3396}
3397
07a93626 3398#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3399static void addrconf_sit_config(struct net_device *dev)
3400{
3401 struct inet6_dev *idev;
3402
3403 ASSERT_RTNL();
3404
1ab1457c
YH		 3405 /*
3406 * Configure the tunnel with one of our IPv4
3407 * addresses... we should configure all of
1da177e4
LT		 3408 * our v4 addrs in the tunnel
3409 */
3410
e5d08d71 3411 idev = ipv6_find_idev(dev);
db0b99f5 3412 if (IS_ERR(idev)) {
91df42be 3413 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3414 return;
3415 }
3416
c7dc89c0 3417 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3418 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3419 return;
3420 }
3421
e5dd7294 3422 add_v4_addrs(idev);
1da177e4 3423
62b54dd9 3424 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3425 addrconf_add_mroute(dev);
1da177e4 3426}
0be669bb 3427#endif
1da177e4 3428
e5dd7294 3429#if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
aee80b54 3430static void addrconf_gre_config(struct net_device *dev)
3431{
3432 struct inet6_dev *idev;
aee80b54 3433
aee80b54 3434 ASSERT_RTNL();
3435
e5d08d71 3436 idev = ipv6_find_idev(dev);
db0b99f5 3437 if (IS_ERR(idev)) {
91df42be 3438 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3439 return;
3440 }
3441
e5dd7294
AQ		 3442 if (dev->type == ARPHRD_ETHER) {
3443 addrconf_addr_gen(idev, true);
3444 return;
3445 }
3446
3447 add_v4_addrs(idev);
3448
d9e4ce65
HFS		 3449 if (dev->flags & IFF_POINTOPOINT)
3450 addrconf_add_mroute(dev);
aee80b54 3451}
3452#endif
3453
afb1d4b5
DA		 3454static int fixup_permanent_addr(struct net *net,
3455 struct inet6_dev *idev,
f1705ec1
DA		 3456 struct inet6_ifaddr *ifp)
3457{
93c2fb25 3458 /* !fib6_node means the host route was removed from the
8048ced9
DA		 3459 * FIB, for example, if 'lo' device is taken down. In that
3460 * case regenerate the host route.
3461 */
93c2fb25 3462 if (!ifp->rt || !ifp->rt->fib6_node) {
360a9887 3463 struct fib6_info *f6i, *prev;
f1705ec1 3464
360a9887
DA		 3465 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3466 GFP_ATOMIC);
3467 if (IS_ERR(f6i))
3468 return PTR_ERR(f6i);
f1705ec1 3469
8048ced9
DA		 3470 /* ifp->rt can be accessed outside of rtnl */
3471 spin_lock(&ifp->lock);
3472 prev = ifp->rt;
360a9887 3473 ifp->rt = f6i;
8048ced9
DA		 3474 spin_unlock(&ifp->lock);
3475
93531c67 3476 fib6_info_release(prev);
f1705ec1
DA		 3477 }
3478
3479 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3480 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
8308f3ff
DA		 3481 ifp->rt_priority, idev->dev, 0, 0,
3482 GFP_ATOMIC);
f1705ec1
DA		 3483 }
3484
6d717134
DA		 3485 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3486 addrconf_dad_start(ifp);
f1705ec1
DA		 3487
3488 return 0;
3489}
3490
afb1d4b5 3491static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
f1705ec1
DA		 3492{
3493 struct inet6_ifaddr *ifp, *tmp;
3494 struct inet6_dev *idev;
3495
3496 idev = __in6_dev_get(dev);
3497 if (!idev)
3498 return;
3499
3500 write_lock_bh(&idev->lock);
3501
3502 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3503 if ((ifp->flags & IFA_F_PERMANENT) &&
afb1d4b5 3504 fixup_permanent_addr(net, idev, ifp) < 0) {
f1705ec1 3505 write_unlock_bh(&idev->lock);
e669b869 3506 in6_ifa_hold(ifp);
f1705ec1
DA		 3507 ipv6_del_addr(ifp);
3508 write_lock_bh(&idev->lock);
3509
3510 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3511 idev->dev->name, &ifp->addr);
3512 }
3513 }
3514
3515 write_unlock_bh(&idev->lock);
3516}
3517
1ab1457c 3518static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3519 void *ptr)
1da177e4 3520{
351638e7 3521 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
896585d4 3522 struct netdev_notifier_change_info *change_info;
4f7f34ea 3523 struct netdev_notifier_changeupper_info *info;
748e2d93 3524 struct inet6_dev *idev = __in6_dev_get(dev);
60abc0be 3525 struct net *net = dev_net(dev);
c5e33bdd 3526 int run_pending = 0;
b217d616 3527 int err;
1da177e4 3528
e21e8467 3529 switch (event) {
45ba9dd2 3530 case NETDEV_REGISTER:
74235a25 3531 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3532 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3533 if (IS_ERR(idev))
3534 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3535 }
3536 break;
bcdd553f 3537
b7b0b1d2
AD		 3538 case NETDEV_CHANGEMTU:
3539 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3540 if (dev->mtu < IPV6_MIN_MTU) {
60abc0be 3541 addrconf_ifdown(dev, dev != net->loopback_dev);
b7b0b1d2
AD		 3542 break;
3543 }
3544
3545 if (idev) {
3546 rt6_mtu_change(dev, dev->mtu);
3547 idev->cnf.mtu6 = dev->mtu;
3548 break;
3549 }
3550
3551 /* allocate new idev */
3552 idev = ipv6_add_dev(dev);
3553 if (IS_ERR(idev))
3554 break;
3555
3556 /* device is still not ready */
3557 if (!(idev->if_flags & IF_READY))
3558 break;
3559
3560 run_pending = 1;
a8eceea8 3561 fallthrough;
1da177e4 3562 case NETDEV_UP:
3c21edbd 3563 case NETDEV_CHANGE:
c2edacf8
JV		 3564 if (dev->flags & IFF_SLAVE)
3565 break;
3566
3ce62a84
WC		 3567 if (idev && idev->cnf.disable_ipv6)
3568 break;
3569
3c21edbd 3570 if (event == NETDEV_UP) {
38bd10c4 3571 /* restore routes for permanent addresses */
afb1d4b5 3572 addrconf_permanent_addr(net, dev);
38bd10c4 3573
1f372c7b 3574 if (!addrconf_link_ready(dev)) {
3c21edbd 3575 /* device is not ready yet. */
7c62b8dd
LR		 3576 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3577 dev->name);
3c21edbd
YH		 3578 break;
3579 }
99081049 3580
d31c7b8f
EP		 3581 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3582 idev = ipv6_add_dev(dev);
3583
a317a2f1 3584 if (!IS_ERR_OR_NULL(idev)) {
99081049 3585 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3586 run_pending = 1;
3587 }
b7b0b1d2 3588 } else if (event == NETDEV_CHANGE) {
1f372c7b 3589 if (!addrconf_link_ready(dev)) {
3c21edbd 3590 /* device is still not ready. */
27c6fa73 3591 rt6_sync_down_dev(dev, event);
3c21edbd
YH		 3592 break;
3593 }
3594
896585d4 3595 if (!IS_ERR_OR_NULL(idev)) {
a088d1d7
LL		 3596 if (idev->if_flags & IF_READY) {
3597 /* device is already configured -
3598 * but resend MLD reports, we might
3599 * have roamed and need to update
3600 * multicast snooping switches
3601 */
3602 ipv6_mc_up(idev);
896585d4
HL		 3603 change_info = ptr;
3604 if (change_info->flags_changed & IFF_NOARP)
3605 addrconf_dad_run(idev, true);
27c6fa73 3606 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3c21edbd 3607 break;
a088d1d7 3608 }
3c21edbd
YH		 3609 idev->if_flags |= IF_READY;
3610 }
3611
f3213831
JP		 3612 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3613 dev->name);
3c21edbd 3614
c5e33bdd 3615 run_pending = 1;
3c21edbd
YH		 3616 }
3617
e21e8467 3618 switch (dev->type) {
07a93626 3619#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3620 case ARPHRD_SIT:
3621 addrconf_sit_config(dev);
3622 break;
aee80b54 3623#endif
e5dd7294
AQ		 3624#if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3625 case ARPHRD_IP6GRE:
aee80b54 3626 case ARPHRD_IPGRE:
3627 addrconf_gre_config(dev);
3628 break;
0be669bb 3629#endif
1da177e4
LT		 3630 case ARPHRD_LOOPBACK:
3631 init_loopback(dev);
3632 break;
3633
3634 default:
3635 addrconf_dev_config(dev);
3636 break;
3ff50b79 3637 }
bcdd553f 3638
a317a2f1 3639 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd 3640 if (run_pending)
896585d4 3641 addrconf_dad_run(idev, false);
c5e33bdd 3642
2127d95a
IS		 3643 /* Device has an address by now */
3644 rt6_sync_up(dev, RTNH_F_DEAD);
3645
bcdd553f
SH		 3646 /*
3647 * If the MTU changed during the interface down,
3648 * when the interface up, the changed MTU must be
3649 * reflected in the idev as well as routers.
1da177e4 3650 */
bcdd553f
SH		 3651 if (idev->cnf.mtu6 != dev->mtu &&
3652 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3653 rt6_mtu_change(dev, dev->mtu);
3654 idev->cnf.mtu6 = dev->mtu;
3655 }
3656 idev->tstamp = jiffies;
3657 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3658
3659 /*
3660 * If the changed mtu during down is lower than
3661 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3662 */
3663 if (dev->mtu < IPV6_MIN_MTU)
60abc0be 3664 addrconf_ifdown(dev, dev != net->loopback_dev);
1da177e4
LT		 3665 }
3666 break;
3667
1da177e4
LT		 3668 case NETDEV_DOWN:
3669 case NETDEV_UNREGISTER:
3670 /*
3671 * Remove all addresses from this interface.
3672 */
3673 addrconf_ifdown(dev, event != NETDEV_DOWN);
3674 break;
3c21edbd 3675
1da177e4 3676 case NETDEV_CHANGENAME:
1da177e4 3677 if (idev) {
5632c515 3678 snmp6_unregister_dev(idev);
408c4768 3679 addrconf_sysctl_unregister(idev);
a317a2f1 3680 err = addrconf_sysctl_register(idev);
b217d616
HX		 3681 if (err)
3682 return notifier_from_errno(err);
a317a2f1
WC		 3683 err = snmp6_register_dev(idev);
3684 if (err) {
3685 addrconf_sysctl_unregister(idev);
3686 return notifier_from_errno(err);
3687 }
5632c515 3688 }
1da177e4 3689 break;
bcdd553f 3690
93d9b7d7
JP		 3691 case NETDEV_PRE_TYPE_CHANGE:
3692 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3693 if (idev)
3694 addrconf_type_change(dev, event);
75c78500 3695 break;
4f7f34ea
DA		 3696
3697 case NETDEV_CHANGEUPPER:
3698 info = ptr;
3699
3700 /* flush all routes if dev is linked to or unlinked from
3701 * an L3 master device (e.g., VRF)
3702 */
3703 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
ae79dbf6 3704 addrconf_ifdown(dev, false);
3ff50b79 3705 }
1da177e4
LT		 3706
3707 return NOTIFY_OK;
3708}
3709
3710/*
3711 * addrconf module should be notified of a device going up
3712 */
3713static struct notifier_block ipv6_dev_notf = {
3714 .notifier_call = addrconf_notify,
242d3a49 3715 .priority = ADDRCONF_NOTIFY_PRIORITY,
1da177e4
LT		 3716};
3717
93d9b7d7 3718static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3719{
3720 struct inet6_dev *idev;
3721 ASSERT_RTNL();
3722
3723 idev = __in6_dev_get(dev);
3724
93d9b7d7 3725 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3726 ipv6_mc_remap(idev);
93d9b7d7 3727 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3728 ipv6_mc_unmap(idev);
3729}
3730
70af921d
DA		 3731static bool addr_is_local(const struct in6_addr *addr)
3732{
3733 return ipv6_addr_type(addr) &
3734 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3735}
3736
ae79dbf6 3737static int addrconf_ifdown(struct net_device *dev, bool unregister)
1da177e4 3738{
ae79dbf6 3739 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
c346dca1 3740 struct net *net = dev_net(dev);
502a2ffd 3741 struct inet6_dev *idev;
51454ea4
ND		 3742 struct inet6_ifaddr *ifa;
3743 LIST_HEAD(tmp_addr_list);
0aef78aa 3744 bool keep_addr = false;
9995b408 3745 bool was_ready;
73a8bd74 3746 int state, i;
1da177e4
LT		 3747
3748 ASSERT_RTNL();
3749
4c981e28 3750 rt6_disable_ip(dev, event);
1da177e4
LT		 3751
3752 idev = __in6_dev_get(dev);
63159f29 3753 if (!idev)
1da177e4
LT		 3754 return -ENODEV;
3755
bcdd553f
SH		 3756 /*
3757 * Step 1: remove reference to ipv6 device from parent device.
3758 * Do not dev_put!
1da177e4 3759 */
ae79dbf6 3760 if (unregister) {
1da177e4 3761 idev->dead = 1;
8814c4b5
YH		 3762
3763 /* protected by rtnl_lock */
a9b3cd7f 3764 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3765
3766 /* Step 1.5: remove snmp6 entry */
3767 snmp6_unregister_dev(idev);
3768
3769 }
3770
f1705ec1
DA		 3771 /* combine the user config with event to determine if permanent
3772 * addresses are to be removed from address hash table
3773 */
ae79dbf6 3774 if (!unregister && !idev->cnf.disable_ipv6) {
0aef78aa
IV		 3775 /* aggregate the system setting and interface setting */
3776 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3777
3778 if (!_keep_addr)
3779 _keep_addr = idev->cnf.keep_addr_on_down;
3780
3781 keep_addr = (_keep_addr > 0);
3782 }
f1705ec1 3783
73a8bd74
DM		 3784 /* Step 2: clear hash table */
3785 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
e66d1172 3786 struct hlist_head *h = &net->ipv6.inet6_addr_lst[i];
73a8bd74 3787
e66d1172 3788 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
67ba4152 3789restart:
b67bfe0d 3790 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3791 if (ifa->idev == idev) {
c15b1cca 3792 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3793 /* combined flag + permanent flag decide if
3794 * address is retained on a down event
3795 */
3796 if (!keep_addr ||
70af921d
DA		 3797 !(ifa->flags & IFA_F_PERMANENT) ||
3798 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3799 hlist_del_init_rcu(&ifa->addr_lst);
3800 goto restart;
3801 }
73a8bd74
DM		 3802 }
3803 }
e66d1172 3804 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
73a8bd74
DM		 3805 }
3806
1da177e4
LT		 3807 write_lock_bh(&idev->lock);
3808
b7b1bfce
HFS		 3809 addrconf_del_rs_timer(idev);
3810
9995b408 3811 /* Step 2: clear flags for stateless addrconf, repeated down
3812 * detection
3813 */
3814 was_ready = idev->if_flags & IF_READY;
ae79dbf6 3815 if (!unregister)
3c21edbd 3816 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3817
bcdd553f 3818 /* Step 3: clear tempaddr list */
372e6c8f 3819 while (!list_empty(&idev->tempaddr_list)) {
3820 ifa = list_first_entry(&idev->tempaddr_list,
3821 struct inet6_ifaddr, tmp_list);
3822 list_del(&ifa->tmp_list);
1da177e4
LT		 3823 write_unlock_bh(&idev->lock);
3824 spin_lock_bh(&ifa->lock);
3825
3826 if (ifa->ifpub) {
3827 in6_ifa_put(ifa->ifpub);
3828 ifa->ifpub = NULL;
3829 }
3830 spin_unlock_bh(&ifa->lock);
3831 in6_ifa_put(ifa);
3832 write_lock_bh(&idev->lock);
3833 }
8f37ada5 3834
51454ea4
ND		 3835 list_for_each_entry(ifa, &idev->addr_list, if_list)
3836 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
3837 write_unlock_bh(&idev->lock);
3838
3839 while (!list_empty(&tmp_addr_list)) {
8d1c802b 3840 struct fib6_info *rt = NULL;
a2d6cbb0 3841 bool keep;
38bd10c4 3842
51454ea4
ND		 3843 ifa = list_first_entry(&tmp_addr_list,
3844 struct inet6_ifaddr, if_list_aux);
3845 list_del(&ifa->if_list_aux);
3846
f1705ec1 3847 addrconf_del_dad_work(ifa);
84e8b803 3848
a2d6cbb0
RV		 3849 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3850 !addr_is_local(&ifa->addr);
a2d6cbb0 3851
8e8e676d 3852 spin_lock_bh(&ifa->lock);
f1705ec1 3853
a2d6cbb0 3854 if (keep) {
f1705ec1
DA		 3855 /* set state to skip the notifier below */
3856 state = INET6_IFADDR_STATE_DEAD;
6d717134 3857 ifa->state = INET6_IFADDR_STATE_PREDAD;
f1705ec1
DA		 3858 if (!(ifa->flags & IFA_F_NODAD))
3859 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3860
3861 rt = ifa->rt;
3862 ifa->rt = NULL;
f1705ec1
DA		 3863 } else {
3864 state = ifa->state;
3865 ifa->state = INET6_IFADDR_STATE_DEAD;
f1705ec1
DA		 3866 }
3867
8e8e676d 3868 spin_unlock_bh(&ifa->lock);
9d82ca98 3869
38bd10c4 3870 if (rt)
11dd74b3 3871 ip6_del_rt(net, rt, false);
38bd10c4 3872
73a8bd74
DM		 3873 if (state != INET6_IFADDR_STATE_DEAD) {
3874 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3875 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
ea06f717
MM		 3876 } else {
3877 if (idev->cnf.forwarding)
3878 addrconf_leave_anycast(ifa);
3879 addrconf_leave_solict(ifa->idev, &ifa->addr);
27bdb2ab 3880 }
8f37ada5 3881
8ef802aa 3882 if (!keep) {
51454ea4 3883 write_lock_bh(&idev->lock);
8ef802aa 3884 list_del_rcu(&ifa->if_list);
51454ea4 3885 write_unlock_bh(&idev->lock);
8ef802aa
ED		 3886 in6_ifa_put(ifa);
3887 }
73a8bd74 3888 }
8f37ada5 3889
381f4dca 3890 /* Step 5: Discard anycast and multicast list */
ae79dbf6 3891 if (unregister) {
381f4dca 3892 ipv6_ac_destroy_dev(idev);
1da177e4 3893 ipv6_mc_destroy_dev(idev);
9995b408 3894 } else if (was_ready) {
1da177e4 3895 ipv6_mc_down(idev);
381f4dca 3896 }
1da177e4 3897
1da177e4 3898 idev->tstamp = jiffies;
49b99da2 3899 idev->ra_mtu = 0;
1ab1457c 3900
bcdd553f 3901 /* Last: Shot the device (if unregistered) */
ae79dbf6 3902 if (unregister) {
408c4768 3903 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3904 neigh_parms_release(&nd_tbl, idev->nd_parms);
3905 neigh_ifdown(&nd_tbl, dev);
3906 in6_dev_put(idev);
3907 }
3908 return 0;
3909}
3910
e99e88a9 3911static void addrconf_rs_timer(struct timer_list *t)
1da177e4 3912{
e99e88a9 3913 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
caf92bc4 3914 struct net_device *dev = idev->dev;
b7b1bfce 3915 struct in6_addr lladdr;
1da177e4 3916
b7b1bfce 3917 write_lock(&idev->lock);
5b2a1953 3918 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3919 goto out;
3920
9ba2add3 3921 if (!ipv6_accept_ra(idev))
5b2a1953 3922 goto out;
3923
3924 /* Announcement received after solicitation was sent */
3925 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3926 goto out;
1da177e4 3927
bd11f074 3928 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
caf92bc4
CW		 3929 write_unlock(&idev->lock);
3930 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3931 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3932 &in6addr_linklocal_allrouters);
3933 else
caf92bc4 3934 goto put;
1da177e4 3935
caf92bc4 3936 write_lock(&idev->lock);
bd11f074
MŻ		 3937 idev->rs_interval = rfc3315_s14_backoff_update(
3938 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
b7b1bfce
HFS		 3939 /* The wait after the last probe can be shorter */
3940 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3941 idev->cnf.rtr_solicits) ?
3942 idev->cnf.rtr_solicit_delay :
bd11f074 3943 idev->rs_interval);
1da177e4 3944 } else {
1da177e4
LT		 3945 /*
3946 * Note: we do not support deprecated "all on-link"
3947 * assumption any longer.
3948 */
91df42be 3949 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3950 }
3951
3952out:
b7b1bfce 3953 write_unlock(&idev->lock);
caf92bc4 3954put:
b7b1bfce 3955 in6_dev_put(idev);
1da177e4
LT		 3956}
3957
3958/*
3959 * Duplicate Address Detection
3960 */
3c21edbd
YH		 3961static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3962{
3963 unsigned long rand_num;
3964 struct inet6_dev *idev = ifp->idev;
adc176c5 3965 u64 nonce;
3c21edbd 3966
95c385b4
NH		 3967 if (ifp->flags & IFA_F_OPTIMISTIC)
3968 rand_num = 0;
3969 else
63862b5b 3970 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3971
adc176c5
EN		 3972 nonce = 0;
3973 if (idev->cnf.enhanced_dad ||
3974 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3975 do
3976 get_random_bytes(&nonce, 6);
3977 while (nonce == 0);
3978 }
3979 ifp->dad_nonce = nonce;
b7b1bfce 3980 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3981 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3982}
3983
c15b1cca 3984static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3985{
3986 struct inet6_dev *idev = ifp->idev;
3987 struct net_device *dev = idev->dev;
764d3be6 3988 bool bump_id, notify = false;
afb1d4b5 3989 struct net *net;
1da177e4
LT		 3990
3991 addrconf_join_solict(dev, &ifp->addr);
3992
1da177e4 3993 read_lock_bh(&idev->lock);
622ccdf1 3994 spin_lock(&ifp->lock);
e9d3e084 3995 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3996 goto out;
1da177e4 3997
afb1d4b5 3998 net = dev_net(dev);
1da177e4 3999 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
afb1d4b5 4000 (net->ipv6.devconf_all->accept_dad < 1 &&
a2d3f3e3 4001 idev->cnf.accept_dad < 1) ||
55ebaef1
NT		 4002 !(ifp->flags&IFA_F_TENTATIVE) ||
4003 ifp->flags & IFA_F_NODAD) {
c76fe2d9
DA		 4004 bool send_na = false;
4005
4006 if (ifp->flags & IFA_F_TENTATIVE &&
4007 !(ifp->flags & IFA_F_OPTIMISTIC))
4008 send_na = true;
764d3be6 4009 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 4010 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 4011 spin_unlock(&ifp->lock);
1da177e4
LT		 4012 read_unlock_bh(&idev->lock);
4013
c76fe2d9 4014 addrconf_dad_completed(ifp, bump_id, send_na);
1da177e4
LT		 4015 return;
4016 }
4017
6732bade 4018 if (!(idev->if_flags & IF_READY)) {
21809faf 4019 spin_unlock(&ifp->lock);
6732bade 4020 read_unlock_bh(&idev->lock);
3c21edbd 4021 /*
590a9887 4022 * If the device is not ready:
3c21edbd
YH		 4023 * - keep it tentative if it is a permanent address.
4024 * - otherwise, kill it.
4025 */
4026 in6_ifa_hold(ifp);
cc411d0b 4027 addrconf_dad_stop(ifp, 0);
6732bade 4028 return;
3c21edbd 4029 }
95c385b4
NH		 4030
4031 /*
4032 * Optimistic nodes can start receiving
4033 * Frames right away
4034 */
7fd2561e 4035 if (ifp->flags & IFA_F_OPTIMISTIC) {
afb1d4b5
DA		 4036 ip6_ins_rt(net, ifp->rt);
4037 if (ipv6_use_optimistic_addr(net, idev)) {
7fd2561e
EK		 4038 /* Because optimistic nodes can use this address,
4039 * notify listeners. If DAD fails, RTM_DELADDR is sent.
4040 */
16186a82 4041 notify = true;
7fd2561e
EK		 4042 }
4043 }
95c385b4 4044
6732bade 4045 addrconf_dad_kick(ifp);
1da177e4 4046out:
622ccdf1 4047 spin_unlock(&ifp->lock);
1da177e4 4048 read_unlock_bh(&idev->lock);
16186a82
SAK		 4049 if (notify)
4050 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 4051}
4052
c15b1cca 4053static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 4054{
c15b1cca
HFS		 4055 bool begin_dad = false;
4056
8e8e676d 4057 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 4058 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4059 ifp->state = INET6_IFADDR_STATE_PREDAD;
4060 begin_dad = true;
4061 }
8e8e676d 4062 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 4063
4064 if (begin_dad)
4065 addrconf_mod_dad_work(ifp, 0);
4066}
4067
4068static void addrconf_dad_work(struct work_struct *w)
4069{
4070 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4071 struct inet6_ifaddr,
4072 dad_work);
1da177e4 4073 struct inet6_dev *idev = ifp->idev;
764d3be6 4074 bool bump_id, disable_ipv6 = false;
1da177e4
LT		 4075 struct in6_addr mcaddr;
4076
c15b1cca
HFS		 4077 enum {
4078 DAD_PROCESS,
4079 DAD_BEGIN,
4080 DAD_ABORT,
4081 } action = DAD_PROCESS;
4082
4083 rtnl_lock();
4084
8e8e676d 4085 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 4086 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4087 action = DAD_BEGIN;
4088 ifp->state = INET6_IFADDR_STATE_DAD;
4089 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4090 action = DAD_ABORT;
4091 ifp->state = INET6_IFADDR_STATE_POSTDAD;
85b51b12 4092
35e015e1
MC		 4093 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4094 idev->cnf.accept_dad > 1) &&
4095 !idev->cnf.disable_ipv6 &&
85b51b12
MM		 4096 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4097 struct in6_addr addr;
4098
4099 addr.s6_addr32[0] = htonl(0xfe800000);
4100 addr.s6_addr32[1] = 0;
4101
4102 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4103 ipv6_addr_equal(&ifp->addr, &addr)) {
4104 /* DAD failed for link-local based on MAC */
4105 idev->cnf.disable_ipv6 = 1;
4106
4107 pr_info("%s: IPv6 being disabled!\n",
4108 ifp->idev->dev->name);
4109 disable_ipv6 = true;
4110 }
4111 }
c15b1cca 4112 }
8e8e676d 4113 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 4114
4115 if (action == DAD_BEGIN) {
4116 addrconf_dad_begin(ifp);
4117 goto out;
4118 } else if (action == DAD_ABORT) {
751eb6b6 4119 in6_ifa_hold(ifp);
c15b1cca 4120 addrconf_dad_stop(ifp, 1);
85b51b12 4121 if (disable_ipv6)
ae79dbf6 4122 addrconf_ifdown(idev->dev, false);
c15b1cca
HFS		 4123 goto out;
4124 }
4125
b7b1bfce 4126 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 4127 goto out;
4128
c15b1cca 4129 write_lock_bh(&idev->lock);
122e4519 4130 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 4131 write_unlock_bh(&idev->lock);
1da177e4
LT		 4132 goto out;
4133 }
21809faf 4134
4135 spin_lock(&ifp->lock);
622ccdf1
HX		 4136 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4137 spin_unlock(&ifp->lock);
c15b1cca 4138 write_unlock_bh(&idev->lock);
622ccdf1
HX		 4139 goto out;
4140 }
4141
b7b1bfce 4142 if (ifp->dad_probes == 0) {
c76fe2d9
DA		 4143 bool send_na = false;
4144
1da177e4
LT		 4145 /*
4146 * DAD was successful
4147 */
4148
c76fe2d9
DA		 4149 if (ifp->flags & IFA_F_TENTATIVE &&
4150 !(ifp->flags & IFA_F_OPTIMISTIC))
4151 send_na = true;
764d3be6 4152 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 4153 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 4154 spin_unlock(&ifp->lock);
c15b1cca 4155 write_unlock_bh(&idev->lock);
1da177e4 4156
c76fe2d9 4157 addrconf_dad_completed(ifp, bump_id, send_na);
1da177e4
LT		 4158
4159 goto out;
4160 }
4161
b7b1bfce 4162 ifp->dad_probes--;
c15b1cca 4163 addrconf_mod_dad_work(ifp,
19e16d22
HL		 4164 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4165 HZ/100));
21809faf 4166 spin_unlock(&ifp->lock);
c15b1cca 4167 write_unlock_bh(&idev->lock);
1da177e4
LT		 4168
4169 /* send a neighbour solicitation for our addr */
1da177e4 4170 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
adc176c5
EN		 4171 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4172 ifp->dad_nonce);
1da177e4
LT		 4173out:
4174 in6_ifa_put(ifp);
c15b1cca 4175 rtnl_unlock();
1da177e4
LT		 4176}
4177
11ffff75
HFS		 4178/* ifp->idev must be at least read locked */
4179static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4180{
4181 struct inet6_ifaddr *ifpiter;
4182 struct inet6_dev *idev = ifp->idev;
4183
602582ca
HFS		 4184 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4185 if (ifpiter->scope > IFA_LINK)
4186 break;
11ffff75
HFS		 4187 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4188 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4189 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4190 IFA_F_PERMANENT)
4191 return false;
4192 }
4193 return true;
4194}
4195
c76fe2d9
DA		 4196static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4197 bool send_na)
1da177e4 4198{
e21e8467 4199 struct net_device *dev = ifp->idev->dev;
b7b1bfce 4200 struct in6_addr lladdr;
b173ee48 4201 bool send_rs, send_mld;
b7b1bfce 4202
c15b1cca 4203 addrconf_del_dad_work(ifp);
1da177e4
LT		 4204
4205 /*
4206 * Configure the address for reception. Now it is valid.
4207 */
4208
4209 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4210
026359bc
TA		 4211 /* If added prefix is link local and we are prepared to process
4212 router advertisements, start sending router solicitations.
1da177e4
LT		 4213 */
4214
1ec047eb 4215 read_lock_bh(&ifp->idev->lock);
11ffff75 4216 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 4217 send_rs = send_mld &&
4218 ipv6_accept_ra(ifp->idev) &&
bd11f074 4219 ifp->idev->cnf.rtr_solicits != 0 &&
b52e1cce 4220 (dev->flags & IFF_LOOPBACK) == 0 &&
4221 (dev->type != ARPHRD_TUNNEL);
1ec047eb
HFS		 4222 read_unlock_bh(&ifp->idev->lock);
4223
b173ee48
HFS		 4224 /* While dad is in progress mld report's source address is in6_addrany.
4225 * Resend with proper ll now.
4226 */
4227 if (send_mld)
4228 ipv6_mc_dad_complete(ifp->idev);
4229
c76fe2d9
DA		 4230 /* send unsolicited NA if enabled */
4231 if (send_na &&
4232 (ifp->idev->cnf.ndisc_notify ||
4233 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4234 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4235 /*router=*/ !!ifp->idev->cnf.forwarding,
4236 /*solicited=*/ false, /*override=*/ true,
4237 /*inc_opt=*/ true);
4238 }
4239
1ec047eb 4240 if (send_rs) {
1da177e4
LT		 4241 /*
4242 * If a host as already performed a random delay
4243 * [...] as part of DAD [...] there is no need
4244 * to delay again before sending the first RS
4245 */
1ec047eb 4246 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 4247 return;
1ec047eb 4248 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 4249
b7b1bfce
HFS		 4250 write_lock_bh(&ifp->idev->lock);
4251 spin_lock(&ifp->lock);
bd11f074
MŻ		 4252 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4253 ifp->idev->cnf.rtr_solicit_interval);
b7b1bfce 4254 ifp->idev->rs_probes = 1;
1da177e4 4255 ifp->idev->if_flags |= IF_RS_SENT;
bd11f074 4256 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
b7b1bfce
HFS		 4257 spin_unlock(&ifp->lock);
4258 write_unlock_bh(&ifp->idev->lock);
1da177e4 4259 }
764d3be6
PA		 4260
4261 if (bump_id)
4262 rt_genid_bump_ipv6(dev_net(dev));
a11a7f71
MH		 4263
4264 /* Make sure that a new temporary address will be created
4265 * before this temporary address becomes deprecated.
4266 */
4267 if (ifp->flags & IFA_F_TEMPORARY)
8805d13f 4268 addrconf_verify_rtnl(dev_net(dev));
1da177e4
LT		 4269}
4270
896585d4 4271static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
e21e8467 4272{
c5e33bdd
YH		 4273 struct inet6_ifaddr *ifp;
4274
4275 read_lock_bh(&idev->lock);
502a2ffd 4276 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 4277 spin_lock(&ifp->lock);
896585d4
HL		 4278 if ((ifp->flags & IFA_F_TENTATIVE &&
4279 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4280 if (restart)
4281 ifp->state = INET6_IFADDR_STATE_PREDAD;
f2344a13 4282 addrconf_dad_kick(ifp);
896585d4 4283 }
21809faf 4284 spin_unlock(&ifp->lock);
c5e33bdd
YH		 4285 }
4286 read_unlock_bh(&idev->lock);
4287}
4288
1da177e4
LT		 4289#ifdef CONFIG_PROC_FS
4290struct if6_iter_state {
3c40090a 4291 struct seq_net_private p;
1da177e4 4292 int bucket;
1d578303 4293 int offset;
1da177e4
LT		 4294};
4295
1d578303 4296static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4 4297{
1da177e4 4298 struct if6_iter_state *state = seq->private;
1218854a 4299 struct net *net = seq_file_net(seq);
a5c1d98f 4300 struct inet6_ifaddr *ifa = NULL;
1d578303 4301 int p = 0;
1da177e4 4302
1d578303
MM		 4303 /* initial bucket if pos is 0 */
4304 if (pos == 0) {
4305 state->bucket = 0;
4306 state->offset = 0;
4307 }
4308
4309 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
e66d1172 4310 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket],
1d578303
MM		 4311 addr_lst) {
4312 /* sync with offset */
4313 if (p < state->offset) {
4314 p++;
4315 continue;
4316 }
9f0d3c27 4317 return ifa;
1d578303
MM		 4318 }
4319
4320 /* prepare for next bucket */
4321 state->offset = 0;
4322 p = 0;
1da177e4 4323 }
c2e21293 4324 return NULL;
1da177e4
LT		 4325}
4326
c2e21293 4327static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4328 struct inet6_ifaddr *ifa)
1da177e4
LT		 4329{
4330 struct if6_iter_state *state = seq->private;
1218854a 4331 struct net *net = seq_file_net(seq);
1da177e4 4332
a5c1d98f 4333 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
1d578303 4334 state->offset++;
9f0d3c27 4335 return ifa;
1d578303 4336 }
3c40090a 4337
86f9bd1f 4338 state->offset = 0;
c2e21293 4339 while (++state->bucket < IN6_ADDR_HSIZE) {
a5c1d98f 4340 hlist_for_each_entry_rcu(ifa,
e66d1172 4341 &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27 4342 return ifa;
c2e21293 4343 }
1da177e4 4344 }
3c40090a 4345
c2e21293 4346 return NULL;
1da177e4
LT		 4347}
4348
1da177e4 4349static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
a5c1d98f 4350 __acquires(rcu)
1da177e4 4351{
a5c1d98f 4352 rcu_read_lock();
1d578303 4353 return if6_get_first(seq, *pos);
1da177e4
LT		 4354}
4355
4356static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4357{
4358 struct inet6_ifaddr *ifa;
4359
4360 ifa = if6_get_next(seq, v);
4361 ++*pos;
4362 return ifa;
4363}
4364
4365static void if6_seq_stop(struct seq_file *seq, void *v)
a5c1d98f 4366 __releases(rcu)
1da177e4 4367{
a5c1d98f 4368 rcu_read_unlock();
1da177e4
LT		 4369}
4370
4371static int if6_seq_show(struct seq_file *seq, void *v)
4372{
4373 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4374 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4375 &ifp->addr,
1da177e4
LT		 4376 ifp->idev->dev->ifindex,
4377 ifp->prefix_len,
4378 ifp->scope,
971a351c 4379 (u8) ifp->flags,
1da177e4
LT		 4380 ifp->idev->dev->name);
4381 return 0;
4382}
4383
56b3d975 4384static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4385 .start = if6_seq_start,
4386 .next = if6_seq_next,
4387 .show = if6_seq_show,
4388 .stop = if6_seq_stop,
4389};
4390
2c8c1e72 4391static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4392{
c3506372
CH		 4393 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4394 sizeof(struct if6_iter_state)))
1da177e4
LT		 4395 return -ENOMEM;
4396 return 0;
4397}
4398
2c8c1e72 4399static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4400{
ece31ffd 4401 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4402}
4403
4404static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4405 .init = if6_proc_net_init,
4406 .exit = if6_proc_net_exit,
3c40090a
DL		 4407};
4408
4409int __init if6_proc_init(void)
4410{
4411 return register_pernet_subsys(&if6_proc_net_ops);
4412}
4413
1da177e4
LT		 4414void if6_proc_exit(void)
4415{
3c40090a 4416 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4417}
4418#endif /* CONFIG_PROC_FS */
4419
07a93626 4420#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4421/* Check if address is a home address configured on any interface. */
b71d1d42 4422int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c 4423{
3f27fb23 4424 unsigned int hash = inet6_addr_hash(net, addr);
c2e21293 4425 struct inet6_ifaddr *ifp = NULL;
3f27fb23 4426 int ret = 0;
c2e21293 4427
4e5f47ab 4428 rcu_read_lock();
e66d1172 4429 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
caad295f 4430 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4431 (ifp->flags & IFA_F_HOMEADDRESS)) {
4432 ret = 1;
4433 break;
4434 }
4435 }
4e5f47ab 4436 rcu_read_unlock();
3b9f9a1c
NT		 4437 return ret;
4438}
4439#endif
4440
f37c6059
AA		 4441/* RFC6554 has some algorithm to avoid loops in segment routing by
4442 * checking if the segments contains any of a local interface address.
4443 *
4444 * Quote:
4445 *
4446 * To detect loops in the SRH, a router MUST determine if the SRH
4447 * includes multiple addresses assigned to any interface on that router.
4448 * If such addresses appear more than once and are separated by at least
4449 * one address not assigned to that router.
4450 */
4451int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4452 unsigned char nsegs)
4453{
4454 const struct in6_addr *addr;
4455 int i, ret = 0, found = 0;
4456 struct inet6_ifaddr *ifp;
4457 bool separated = false;
4458 unsigned int hash;
4459 bool hash_found;
4460
4461 rcu_read_lock();
4462 for (i = 0; i < nsegs; i++) {
4463 addr = &segs[i];
4464 hash = inet6_addr_hash(net, addr);
4465
4466 hash_found = false;
e66d1172 4467 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
f37c6059
AA		 4468
4469 if (ipv6_addr_equal(&ifp->addr, addr)) {
4470 hash_found = true;
4471 break;
4472 }
4473 }
4474
4475 if (hash_found) {
4476 if (found > 1 && separated) {
4477 ret = 1;
4478 break;
4479 }
4480
4481 separated = false;
4482 found++;
4483 } else {
4484 separated = true;
4485 }
4486 }
4487 rcu_read_unlock();
4488
4489 return ret;
4490}
4491
1da177e4
LT		 4492/*
4493 * Periodic address status verification
4494 */
4495
8805d13f 4496static void addrconf_verify_rtnl(struct net *net)
1da177e4 4497{
b2db7564 4498 unsigned long now, next, next_sec, next_sched;
1da177e4 4499 struct inet6_ifaddr *ifp;
1da177e4
LT		 4500 int i;
4501
c15b1cca
HFS		 4502 ASSERT_RTNL();
4503
5c578aed 4504 rcu_read_lock_bh();
1da177e4 4505 now = jiffies;
b2db7564 4506 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4507
8805d13f 4508 cancel_delayed_work(&net->ipv6.addr_chk_work);
1da177e4 4509
bcdd553f 4510 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4511restart:
e66d1172 4512 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) {
1da177e4 4513 unsigned long age;
1da177e4 4514
fad8da3e
YA		 4515 /* When setting preferred_lft to a value not zero or
4516 * infinity, while valid_lft is infinity
4517 * IFA_F_PERMANENT has a non-infinity life time.
4518 */
4519 if ((ifp->flags & IFA_F_PERMANENT) &&
4520 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4521 continue;
4522
4523 spin_lock(&ifp->lock);
b2db7564
YH		 4524 /* We try to batch several events at once. */
4525 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4526
8f27ebb9
YH		 4527 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4528 age >= ifp->valid_lft) {
1da177e4
LT		 4529 spin_unlock(&ifp->lock);
4530 in6_ifa_hold(ifp);
aa8caa76 4531 rcu_read_unlock_bh();
1da177e4 4532 ipv6_del_addr(ifp);
aa8caa76 4533 rcu_read_lock_bh();
1da177e4 4534 goto restart;
8f27ebb9
YH		 4535 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4536 spin_unlock(&ifp->lock);
4537 continue;
1da177e4 4538 } else if (age >= ifp->prefered_lft) {
a1ed0526 4539 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4540 int deprecate = 0;
4541
4542 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4543 deprecate = 1;
4544 ifp->flags |= IFA_F_DEPRECATED;
4545 }
4546
fad8da3e
YA		 4547 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4548 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4549 next = ifp->tstamp + ifp->valid_lft * HZ;
4550
4551 spin_unlock(&ifp->lock);
4552
4553 if (deprecate) {
4554 in6_ifa_hold(ifp);
1da177e4
LT		 4555
4556 ipv6_ifa_notify(0, ifp);
4557 in6_ifa_put(ifp);
4558 goto restart;
4559 }
1da177e4
LT		 4560 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4561 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4562 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4563 ifp->idev->cnf.dad_transmits *
19e16d22 4564 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
88949cf4 4565
1da177e4
LT		 4566 if (age >= ifp->prefered_lft - regen_advance) {
4567 struct inet6_ifaddr *ifpub = ifp->ifpub;
4568 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4569 next = ifp->tstamp + ifp->prefered_lft * HZ;
4570 if (!ifp->regen_count && ifpub) {
4571 ifp->regen_count++;
4572 in6_ifa_hold(ifp);
4573 in6_ifa_hold(ifpub);
4574 spin_unlock(&ifp->lock);
5c578aed 4575
291d809b
HY		 4576 spin_lock(&ifpub->lock);
4577 ifpub->regen_count = 0;
4578 spin_unlock(&ifpub->lock);
e64e469b 4579 rcu_read_unlock_bh();
969c5464 4580 ipv6_create_tempaddr(ifpub, true);
1da177e4
LT		 4581 in6_ifa_put(ifpub);
4582 in6_ifa_put(ifp);
e64e469b 4583 rcu_read_lock_bh();
1da177e4
LT		 4584 goto restart;
4585 }
4586 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4587 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4588 spin_unlock(&ifp->lock);
1da177e4
LT		 4589 } else {
4590 /* ifp->prefered_lft <= ifp->valid_lft */
4591 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4592 next = ifp->tstamp + ifp->prefered_lft * HZ;
4593 spin_unlock(&ifp->lock);
4594 }
4595 }
1da177e4
LT		 4596 }
4597
b2db7564
YH		 4598 next_sec = round_jiffies_up(next);
4599 next_sched = next;
4600
4601 /* If rounded timeout is accurate enough, accept it. */
4602 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4603 next_sched = next_sec;
4604
4605 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4606 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4607 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4608
e32ac250
JP		 4609 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4610 now, next, next_sec, next_sched);
8805d13f 4611 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now);
5c578aed 4612 rcu_read_unlock_bh();
1da177e4
LT		 4613}
4614
c15b1cca
HFS		 4615static void addrconf_verify_work(struct work_struct *w)
4616{
8805d13f
ED		 4617 struct net *net = container_of(to_delayed_work(w), struct net,
4618 ipv6.addr_chk_work);
4619
c15b1cca 4620 rtnl_lock();
8805d13f 4621 addrconf_verify_rtnl(net);
c15b1cca
HFS		 4622 rtnl_unlock();
4623}
4624
8805d13f 4625static void addrconf_verify(struct net *net)
c15b1cca 4626{
8805d13f 4627 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0);
c15b1cca
HFS		 4628}
4629
caeaba79
ND		 4630static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4631 struct in6_addr **peer_pfx)
461d8837
TG		 4632{
4633 struct in6_addr *pfx = NULL;
4634
caeaba79
ND		 4635 *peer_pfx = NULL;
4636
461d8837
TG		 4637 if (addr)
4638 pfx = nla_data(addr);
4639
4640 if (local) {
4641 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4642 *peer_pfx = pfx;
4643 pfx = nla_data(local);
461d8837
TG		 4644 }
4645
4646 return pfx;
4647}
4648
ef7c79ed 4649static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4650 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4651 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4652 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4653 [IFA_FLAGS] = { .len = sizeof(u32) },
8308f3ff 4654 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
6ecf4c37 4655 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
47f0bd50 4656 [IFA_PROTO] = { .type = NLA_U8 },
461d8837
TG		 4657};
4658
1da177e4 4659static int
c21ef3e3
DA		 4660inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4661 struct netlink_ext_ack *extack)
1da177e4 4662{
3b1e0a65 4663 struct net *net = sock_net(skb->sk);
b933f716
TG		 4664 struct ifaddrmsg *ifm;
4665 struct nlattr *tb[IFA_MAX+1];
caeaba79 4666 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4667 u32 ifa_flags;
b933f716 4668 int err;
1da177e4 4669
8cb08174
JB		 4670 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4671 ifa_ipv6_policy, extack);
b933f716
TG		 4672 if (err < 0)
4673 return err;
4674
4675 ifm = nlmsg_data(nlh);
caeaba79 4676 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4677 if (!pfx)
1da177e4
LT		 4678 return -EINVAL;
4679
6046d5b4
HK		 4680 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4681
4682 /* We ignore other flags so far. */
4683 ifa_flags &= IFA_F_MANAGETEMPADDR;
4684
4685 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4686 ifm->ifa_prefixlen);
1da177e4
LT		 4687}
4688
8308f3ff 4689static int modify_prefix_route(struct inet6_ifaddr *ifp,
61794012
HL		 4690 unsigned long expires, u32 flags,
4691 bool modify_peer)
8308f3ff
DA		 4692{
4693 struct fib6_info *f6i;
e7c7faa9 4694 u32 prio;
8308f3ff 4695
61794012
HL		 4696 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4697 ifp->prefix_len,
2b2450ca 4698 ifp->idev->dev, 0, RTF_DEFAULT, true);
8308f3ff
DA		 4699 if (!f6i)
4700 return -ENOENT;
4701
e7c7faa9
DA		 4702 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4703 if (f6i->fib6_metric != prio) {
4704 /* delete old one */
11dd74b3 4705 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
e7c7faa9 4706
8308f3ff 4707 /* add new one */
61794012
HL		 4708 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4709 ifp->prefix_len,
8308f3ff
DA		 4710 ifp->rt_priority, ifp->idev->dev,
4711 expires, flags, GFP_KERNEL);
8308f3ff
DA		 4712 } else {
4713 if (!expires)
4714 fib6_clean_expires(f6i);
4715 else
4716 fib6_set_expires(f6i, expires);
4717
4718 fib6_info_release(f6i);
4719 }
4720
4721 return 0;
4722}
4723
8805d13f
ED		 4724static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp,
4725 struct ifa6_config *cfg)
081bba5b 4726{
6f704992
YH		 4727 u32 flags;
4728 clock_t expires;
4bed72e4 4729 unsigned long timeout;
53bd6749 4730 bool was_managetempaddr;
5b84efec 4731 bool had_prefixroute;
d0098e4c 4732 bool new_peer = false;
46d48046 4733
c15b1cca
HFS		 4734 ASSERT_RTNL();
4735
d169a1f8 4736 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
081bba5b
NT		 4737 return -EINVAL;
4738
d169a1f8 4739 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
53bd6749
JP		 4740 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4741 return -EINVAL;
4742
f1c02cfb 4743 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
d169a1f8 4744 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
f1c02cfb 4745
d169a1f8 4746 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4bed72e4
YH		 4747 if (addrconf_finite_timeout(timeout)) {
4748 expires = jiffies_to_clock_t(timeout * HZ);
d169a1f8 4749 cfg->valid_lft = timeout;
6f704992 4750 flags = RTF_EXPIRES;
4bed72e4
YH		 4751 } else {
4752 expires = 0;
4753 flags = 0;
d169a1f8 4754 cfg->ifa_flags |= IFA_F_PERMANENT;
6f704992 4755 }
081bba5b 4756
d169a1f8 4757 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4bed72e4
YH		 4758 if (addrconf_finite_timeout(timeout)) {
4759 if (timeout == 0)
d169a1f8
DA		 4760 cfg->ifa_flags |= IFA_F_DEPRECATED;
4761 cfg->preferred_lft = timeout;
4bed72e4 4762 }
081bba5b 4763
d0098e4c
HL		 4764 if (cfg->peer_pfx &&
4765 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4766 if (!ipv6_addr_any(&ifp->peer_addr))
4767 cleanup_prefix_route(ifp, expires, true, true);
4768 new_peer = true;
4769 }
4770
081bba5b 4771 spin_lock_bh(&ifp->lock);
53bd6749 4772 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4773 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4774 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4775 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4776 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4777 IFA_F_NOPREFIXROUTE);
d169a1f8 4778 ifp->flags |= cfg->ifa_flags;
081bba5b 4779 ifp->tstamp = jiffies;
d169a1f8
DA		 4780 ifp->valid_lft = cfg->valid_lft;
4781 ifp->prefered_lft = cfg->preferred_lft;
47f0bd50 4782 ifp->ifa_proto = cfg->ifa_proto;
081bba5b 4783
8308f3ff
DA		 4784 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4785 ifp->rt_priority = cfg->rt_priority;
081bba5b 4786
d0098e4c
HL		 4787 if (new_peer)
4788 ifp->peer_addr = *cfg->peer_pfx;
4789
081bba5b
NT		 4790 spin_unlock_bh(&ifp->lock);
4791 if (!(ifp->flags&IFA_F_TENTATIVE))
4792 ipv6_ifa_notify(0, ifp);
081bba5b 4793
d169a1f8 4794 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
8308f3ff
DA		 4795 int rc = -ENOENT;
4796
4797 if (had_prefixroute)
61794012 4798 rc = modify_prefix_route(ifp, expires, flags, false);
8308f3ff
DA		 4799
4800 /* prefix route could have been deleted; if so restore it */
4801 if (rc == -ENOENT) {
4802 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4803 ifp->rt_priority, ifp->idev->dev,
4804 expires, flags, GFP_KERNEL);
4805 }
61794012
HL		 4806
4807 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4808 rc = modify_prefix_route(ifp, expires, flags, true);
4809
4810 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4811 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4812 ifp->rt_priority, ifp->idev->dev,
4813 expires, flags, GFP_KERNEL);
4814 }
5b84efec
TH		 4815 } else if (had_prefixroute) {
4816 enum cleanup_prefix_rt_t action;
4817 unsigned long rt_expires;
4818
4819 write_lock_bh(&ifp->idev->lock);
4820 action = check_cleanup_prefix_route(ifp, &rt_expires);
4821 write_unlock_bh(&ifp->idev->lock);
4822
4823 if (action != CLEANUP_PREFIX_RT_NOP) {
4824 cleanup_prefix_route(ifp, rt_expires,
d0098e4c 4825 action == CLEANUP_PREFIX_RT_DEL, false);
5b84efec 4826 }
761aac73 4827 }
53bd6749
JP		 4828
4829 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
d169a1f8
DA		 4830 if (was_managetempaddr &&
4831 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4832 cfg->valid_lft = 0;
4833 cfg->preferred_lft = 0;
4834 }
4835 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4836 cfg->preferred_lft, !was_managetempaddr,
4837 jiffies);
53bd6749
JP		 4838 }
4839
8805d13f 4840 addrconf_verify_rtnl(net);
081bba5b
NT		 4841
4842 return 0;
4843}
4844
1da177e4 4845static int
c21ef3e3
DA		 4846inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4847 struct netlink_ext_ack *extack)
1da177e4 4848{
3b1e0a65 4849 struct net *net = sock_net(skb->sk);
461d8837
TG		 4850 struct ifaddrmsg *ifm;
4851 struct nlattr *tb[IFA_MAX+1];
19b1518c 4852 struct in6_addr *peer_pfx;
7198f8ce
TG		 4853 struct inet6_ifaddr *ifa;
4854 struct net_device *dev;
f1c02cfb 4855 struct inet6_dev *idev;
19b1518c 4856 struct ifa6_config cfg;
461d8837 4857 int err;
1da177e4 4858
8cb08174
JB		 4859 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4860 ifa_ipv6_policy, extack);
461d8837
TG		 4861 if (err < 0)
4862 return err;
4863
19b1518c
DA		 4864 memset(&cfg, 0, sizeof(cfg));
4865
461d8837 4866 ifm = nlmsg_data(nlh);
19b1518c
DA		 4867 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4868 if (!cfg.pfx)
1da177e4
LT		 4869 return -EINVAL;
4870
19b1518c
DA		 4871 cfg.peer_pfx = peer_pfx;
4872 cfg.plen = ifm->ifa_prefixlen;
8308f3ff
DA		 4873 if (tb[IFA_RT_PRIORITY])
4874 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4875
47f0bd50
JL		 4876 if (tb[IFA_PROTO])
4877 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]);
4878
19b1518c
DA		 4879 cfg.valid_lft = INFINITY_LIFE_TIME;
4880 cfg.preferred_lft = INFINITY_LIFE_TIME;
4881
461d8837 4882 if (tb[IFA_CACHEINFO]) {
0778769d 4883 struct ifa_cacheinfo *ci;
461d8837
TG		 4884
4885 ci = nla_data(tb[IFA_CACHEINFO]);
19b1518c
DA		 4886 cfg.valid_lft = ci->ifa_valid;
4887 cfg.preferred_lft = ci->ifa_prefered;
0778769d
NT		 4888 }
4889
af284937 4890 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4891 if (!dev)
7198f8ce
TG		 4892 return -ENODEV;
4893
19b1518c
DA		 4894 if (tb[IFA_FLAGS])
4895 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4896 else
4897 cfg.ifa_flags = ifm->ifa_flags;
479840ff 4898
55ebaef1 4899 /* We ignore other flags so far. */
19b1518c
DA		 4900 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4901 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4902 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
f1c02cfb
SD		 4903
4904 idev = ipv6_find_idev(dev);
db0b99f5
SD		 4905 if (IS_ERR(idev))
4906 return PTR_ERR(idev);
f1c02cfb
SD		 4907
4908 if (!ipv6_allow_optimistic_dad(net, idev))
19b1518c 4909 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
f1c02cfb 4910
19b1518c
DA		 4911 if (cfg.ifa_flags & IFA_F_NODAD &&
4912 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
f1c02cfb
SD		 4913 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4914 return -EINVAL;
4915 }
55ebaef1 4916
19b1518c 4917 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
63159f29 4918 if (!ifa) {
7198f8ce
TG		 4919 /*
4920 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4921 * userspace already relies on not having to provide this.
7198f8ce 4922 */
19b1518c 4923 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
081bba5b
NT		 4924 }
4925
7198f8ce
TG		 4926 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4927 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4928 err = -EEXIST;
4929 else
8805d13f 4930 err = inet6_addr_modify(net, ifa, &cfg);
7198f8ce
TG		 4931
4932 in6_ifa_put(ifa);
4933
4934 return err;
1da177e4
LT		 4935}
4936
479840ff 4937static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4938 u8 scope, int ifindex)
4939{
4940 struct ifaddrmsg *ifm;
4941
4942 ifm = nlmsg_data(nlh);
4943 ifm->ifa_family = AF_INET6;
4944 ifm->ifa_prefixlen = prefixlen;
4945 ifm->ifa_flags = flags;
4946 ifm->ifa_scope = scope;
4947 ifm->ifa_index = ifindex;
4948}
4949
85486af0
TG		 4950static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4951 unsigned long tstamp, u32 preferred, u32 valid)
4952{
4953 struct ifa_cacheinfo ci;
4954
18a31e1e
TG		 4955 ci.cstamp = cstamp_delta(cstamp);
4956 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4957 ci.ifa_prefered = preferred;
4958 ci.ifa_valid = valid;
4959
4960 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4961}
4962
101bb229
TG		 4963static inline int rt_scope(int ifa_scope)
4964{
4965 if (ifa_scope & IFA_HOST)
4966 return RT_SCOPE_HOST;
4967 else if (ifa_scope & IFA_LINK)
4968 return RT_SCOPE_LINK;
4969 else if (ifa_scope & IFA_SITE)
4970 return RT_SCOPE_SITE;
4971 else
4972 return RT_SCOPE_UNIVERSE;
4973}
4974
0ab6803b
TG		 4975static inline int inet6_ifaddr_msgsize(void)
4976{
339bf98f 4977 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4978 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4979 + nla_total_size(16) /* IFA_ADDRESS */
479840ff 4980 + nla_total_size(sizeof(struct ifa_cacheinfo))
8308f3ff 4981 + nla_total_size(4) /* IFA_FLAGS */
47f0bd50 4982 + nla_total_size(1) /* IFA_PROTO */
8308f3ff 4983 + nla_total_size(4) /* IFA_RT_PRIORITY */;
0ab6803b 4984}
c5396a31 4985
6ba1e6e8
DA		 4986enum addr_type_t {
4987 UNICAST_ADDR,
4988 MULTICAST_ADDR,
4989 ANYCAST_ADDR,
4990};
4991
203651b6
CB		 4992struct inet6_fill_args {
4993 u32 portid;
4994 u32 seq;
4995 int event;
4996 unsigned int flags;
4997 int netnsid;
6371a71f 4998 int ifindex;
6ba1e6e8 4999 enum addr_type_t type;
203651b6
CB		 5000};
5001
1da177e4 5002static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
203651b6 5003 struct inet6_fill_args *args)
1da177e4 5004{
1da177e4 5005 struct nlmsghdr *nlh;
85486af0 5006 u32 preferred, valid;
1da177e4 5007
203651b6
CB		 5008 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5009 sizeof(struct ifaddrmsg), args->flags);
63159f29 5010 if (!nlh)
26932566 5011 return -EMSGSIZE;
0ab6803b 5012
101bb229
TG		 5013 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
5014 ifa->idev->dev->ifindex);
5015
203651b6
CB		 5016 if (args->netnsid >= 0 &&
5017 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
6ecf4c37
CB		 5018 goto error;
5019
6c0d8833 5020 spin_lock_bh(&ifa->lock);
fad8da3e
YA		 5021 if (!((ifa->flags&IFA_F_PERMANENT) &&
5022 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 5023 preferred = ifa->prefered_lft;
5024 valid = ifa->valid_lft;
5025 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 5026 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 5027 if (preferred > tval)
5028 preferred -= tval;
5029 else
5030 preferred = 0;
f56619fc
BH		 5031 if (valid != INFINITY_LIFE_TIME) {
5032 if (valid > tval)
5033 valid -= tval;
5034 else
5035 valid = 0;
5036 }
1da177e4
LT		 5037 }
5038 } else {
85486af0
TG		 5039 preferred = INFINITY_LIFE_TIME;
5040 valid = INFINITY_LIFE_TIME;
5041 }
6c0d8833 5042 spin_unlock_bh(&ifa->lock);
85486af0 5043
7996c799 5044 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 5045 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
5046 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 5047 goto error;
5048 } else
930345ea 5049 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 5050 goto error;
5051
8308f3ff
DA		 5052 if (ifa->rt_priority &&
5053 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
5054 goto error;
5055
caeaba79
ND		 5056 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
5057 goto error;
1da177e4 5058
479840ff
JP		 5059 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
5060 goto error;
5061
47f0bd50
JL		 5062 if (ifa->ifa_proto &&
5063 nla_put_u8(skb, IFA_PROTO, ifa->ifa_proto))
5064 goto error;
5065
053c095a
JB		 5066 nlmsg_end(skb, nlh);
5067 return 0;
caeaba79
ND		 5068
5069error:
5070 nlmsg_cancel(skb, nlh);
5071 return -EMSGSIZE;
1da177e4
LT		 5072}
5073
5074static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
203651b6 5075 struct inet6_fill_args *args)
1da177e4 5076{
1da177e4 5077 struct nlmsghdr *nlh;
101bb229
TG		 5078 u8 scope = RT_SCOPE_UNIVERSE;
5079 int ifindex = ifmca->idev->dev->ifindex;
5080
5081 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5082 scope = RT_SCOPE_SITE;
1da177e4 5083
203651b6
CB		 5084 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5085 sizeof(struct ifaddrmsg), args->flags);
63159f29 5086 if (!nlh)
26932566 5087 return -EMSGSIZE;
85486af0 5088
203651b6 5089 if (args->netnsid >= 0 &&
ceb736e1
ZQ		 5090 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5091 nlmsg_cancel(skb, nlh);
6ecf4c37 5092 return -EMSGSIZE;
ceb736e1 5093 }
6ecf4c37 5094
0ab6803b 5095 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 5096 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 5097 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 5098 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5099 nlmsg_cancel(skb, nlh);
5100 return -EMSGSIZE;
5101 }
85486af0 5102
053c095a
JB		 5103 nlmsg_end(skb, nlh);
5104 return 0;
1da177e4
LT		 5105}
5106
5107static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
203651b6 5108 struct inet6_fill_args *args)
1da177e4 5109{
9ee8cbb2
DA		 5110 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5111 int ifindex = dev ? dev->ifindex : 1;
1da177e4 5112 struct nlmsghdr *nlh;
101bb229 5113 u8 scope = RT_SCOPE_UNIVERSE;
101bb229
TG		 5114
5115 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5116 scope = RT_SCOPE_SITE;
1da177e4 5117
203651b6
CB		 5118 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5119 sizeof(struct ifaddrmsg), args->flags);
63159f29 5120 if (!nlh)
26932566 5121 return -EMSGSIZE;
85486af0 5122
203651b6 5123 if (args->netnsid >= 0 &&
ceb736e1
ZQ		 5124 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5125 nlmsg_cancel(skb, nlh);
6ecf4c37 5126 return -EMSGSIZE;
ceb736e1 5127 }
6ecf4c37 5128
0ab6803b 5129 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 5130 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 5131 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 5132 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5133 nlmsg_cancel(skb, nlh);
5134 return -EMSGSIZE;
5135 }
1da177e4 5136
053c095a
JB		 5137 nlmsg_end(skb, nlh);
5138 return 0;
1da177e4
LT		 5139}
5140
234b27c3
ED		 5141/* called with rcu_read_lock() */
5142static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
fe884c2b 5143 struct netlink_callback *cb, int s_ip_idx,
6ba1e6e8 5144 struct inet6_fill_args *fillargs)
234b27c3 5145{
234b27c3
ED		 5146 struct ifmcaddr6 *ifmca;
5147 struct ifacaddr6 *ifaca;
fe884c2b 5148 int ip_idx = 0;
234b27c3 5149 int err = 1;
234b27c3
ED		 5150
5151 read_lock_bh(&idev->lock);
6ba1e6e8 5152 switch (fillargs->type) {
502a2ffd 5153 case UNICAST_ADDR: {
5154 struct inet6_ifaddr *ifa;
6ba1e6e8 5155 fillargs->event = RTM_NEWADDR;
502a2ffd 5156
234b27c3 5157 /* unicast address incl. temp addr */
502a2ffd 5158 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4ba4c566
DA		 5159 if (ip_idx < s_ip_idx)
5160 goto next;
6ba1e6e8 5161 err = inet6_fill_ifaddr(skb, ifa, fillargs);
053c095a 5162 if (err < 0)
234b27c3 5163 break;
63998ac2 5164 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4ba4c566
DA		 5165next:
5166 ip_idx++;
234b27c3
ED		 5167 }
5168 break;
502a2ffd 5169 }
234b27c3 5170 case MULTICAST_ADDR:
88e2ca30 5171 read_unlock_bh(&idev->lock);
6ba1e6e8 5172 fillargs->event = RTM_GETMULTICAST;
203651b6 5173
234b27c3 5174 /* multicast address */
88e2ca30
TY		 5175 for (ifmca = rcu_dereference(idev->mc_list);
5176 ifmca;
5177 ifmca = rcu_dereference(ifmca->next), ip_idx++) {
234b27c3
ED		 5178 if (ip_idx < s_ip_idx)
5179 continue;
6ba1e6e8 5180 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
053c095a 5181 if (err < 0)
234b27c3
ED		 5182 break;
5183 }
88e2ca30 5184 read_lock_bh(&idev->lock);
234b27c3
ED		 5185 break;
5186 case ANYCAST_ADDR:
6ba1e6e8 5187 fillargs->event = RTM_GETANYCAST;
234b27c3
ED		 5188 /* anycast address */
5189 for (ifaca = idev->ac_list; ifaca;
5190 ifaca = ifaca->aca_next, ip_idx++) {
5191 if (ip_idx < s_ip_idx)
5192 continue;
6ba1e6e8 5193 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
053c095a 5194 if (err < 0)
234b27c3
ED		 5195 break;
5196 }
5197 break;
5198 default:
5199 break;
5200 }
5201 read_unlock_bh(&idev->lock);
fe884c2b 5202 cb->args[2] = ip_idx;
234b27c3
ED		 5203 return err;
5204}
5205
ed6eff11
DA		 5206static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5207 struct inet6_fill_args *fillargs,
5208 struct net **tgt_net, struct sock *sk,
6371a71f 5209 struct netlink_callback *cb)
ed6eff11 5210{
6371a71f 5211 struct netlink_ext_ack *extack = cb->extack;
ed6eff11
DA		 5212 struct nlattr *tb[IFA_MAX+1];
5213 struct ifaddrmsg *ifm;
5214 int err, i;
5215
5216 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5217 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5218 return -EINVAL;
5219 }
5220
5221 ifm = nlmsg_data(nlh);
5222 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5223 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5224 return -EINVAL;
5225 }
6371a71f
DA		 5226
5227 fillargs->ifindex = ifm->ifa_index;
5228 if (fillargs->ifindex) {
5229 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5230 fillargs->flags |= NLM_F_DUMP_FILTERED;
ed6eff11
DA		 5231 }
5232
8cb08174
JB		 5233 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5234 ifa_ipv6_policy, extack);
ed6eff11
DA		 5235 if (err < 0)
5236 return err;
5237
5238 for (i = 0; i <= IFA_MAX; ++i) {
5239 if (!tb[i])
5240 continue;
5241
5242 if (i == IFA_TARGET_NETNSID) {
5243 struct net *net;
5244
5245 fillargs->netnsid = nla_get_s32(tb[i]);
5246 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5247 if (IS_ERR(net)) {
bf4cc40e 5248 fillargs->netnsid = -1;
ed6eff11
DA		 5249 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5250 return PTR_ERR(net);
5251 }
5252 *tgt_net = net;
5253 } else {
5254 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5255 return -EINVAL;
5256 }
5257 }
5258
5259 return 0;
5260}
5261
1da177e4
LT		 5262static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5263 enum addr_type_t type)
5264{
ed6eff11 5265 const struct nlmsghdr *nlh = cb->nlh;
6ba1e6e8
DA		 5266 struct inet6_fill_args fillargs = {
5267 .portid = NETLINK_CB(cb->skb).portid,
5268 .seq = cb->nlh->nlmsg_seq,
5269 .flags = NLM_F_MULTI,
5270 .netnsid = -1,
5271 .type = type,
5272 };
87117baf 5273 struct net *tgt_net = sock_net(skb->sk);
fe884c2b 5274 int idx, s_idx, s_ip_idx;
234b27c3 5275 int h, s_h;
1da177e4 5276 struct net_device *dev;
234b27c3
ED		 5277 struct inet6_dev *idev;
5278 struct hlist_head *head;
242afaa6 5279 int err = 0;
1ab1457c 5280
234b27c3
ED		 5281 s_h = cb->args[0];
5282 s_idx = idx = cb->args[1];
fe884c2b 5283 s_ip_idx = cb->args[2];
5d5619b4 5284
ed6eff11 5285 if (cb->strict_check) {
ed6eff11 5286 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
6371a71f 5287 skb->sk, cb);
ed6eff11 5288 if (err < 0)
242afaa6 5289 goto put_tgt_net;
6371a71f 5290
242afaa6 5291 err = 0;
6371a71f
DA		 5292 if (fillargs.ifindex) {
5293 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
242afaa6
DA		 5294 if (!dev) {
5295 err = -ENODEV;
5296 goto put_tgt_net;
5297 }
6371a71f
DA		 5298 idev = __in6_dev_get(dev);
5299 if (idev) {
5300 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5301 &fillargs);
1518039f
JK		 5302 if (err > 0)
5303 err = 0;
6371a71f
DA		 5304 }
5305 goto put_tgt_net;
5306 }
6ecf4c37
CB		 5307 }
5308
234b27c3 5309 rcu_read_lock();
6ecf4c37 5310 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
234b27c3
ED		 5311 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5312 idx = 0;
6ecf4c37 5313 head = &tgt_net->dev_index_head[h];
b67bfe0d 5314 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 5315 if (idx < s_idx)
5316 goto cont;
4b97efdf 5317 if (h > s_h || idx > s_idx)
234b27c3 5318 s_ip_idx = 0;
e21e8467
SH		 5319 idev = __in6_dev_get(dev);
5320 if (!idev)
234b27c3
ED		 5321 goto cont;
5322
fe884c2b 5323 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
6ba1e6e8 5324 &fillargs) < 0)
234b27c3 5325 goto done;
7562f876 5326cont:
234b27c3
ED		 5327 idx++;
5328 }
1da177e4 5329 }
234b27c3
ED		 5330done:
5331 rcu_read_unlock();
5332 cb->args[0] = h;
5333 cb->args[1] = idx;
6371a71f 5334put_tgt_net:
6ba1e6e8 5335 if (fillargs.netnsid >= 0)
6ecf4c37 5336 put_net(tgt_net);
234b27c3 5337
7c1e8a38 5338 return skb->len ? : err;
1da177e4
LT		 5339}
5340
5341static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5342{
5343 enum addr_type_t type = UNICAST_ADDR;
b854272b 5344
1da177e4
LT		 5345 return inet6_dump_addr(skb, cb, type);
5346}
5347
5348static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5349{
5350 enum addr_type_t type = MULTICAST_ADDR;
b854272b 5351
1da177e4
LT		 5352 return inet6_dump_addr(skb, cb, type);
5353}
5354
5355
5356static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5357{
5358 enum addr_type_t type = ANYCAST_ADDR;
b854272b 5359
1da177e4
LT		 5360 return inet6_dump_addr(skb, cb, type);
5361}
5362
4b1373de
JK		 5363static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5364 const struct nlmsghdr *nlh,
5365 struct nlattr **tb,
5366 struct netlink_ext_ack *extack)
5367{
5368 struct ifaddrmsg *ifm;
5369 int i, err;
5370
5371 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5372 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5373 return -EINVAL;
5374 }
5375
2beb6d29
HL		 5376 if (!netlink_strict_get_check(skb))
5377 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5378 ifa_ipv6_policy, extack);
5379
4b1373de
JK		 5380 ifm = nlmsg_data(nlh);
5381 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5382 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5383 return -EINVAL;
5384 }
5385
8cb08174
JB		 5386 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5387 ifa_ipv6_policy, extack);
4b1373de
JK		 5388 if (err)
5389 return err;
5390
5391 for (i = 0; i <= IFA_MAX; i++) {
5392 if (!tb[i])
5393 continue;
5394
5395 switch (i) {
5396 case IFA_TARGET_NETNSID:
5397 case IFA_ADDRESS:
5398 case IFA_LOCAL:
5399 break;
5400 default:
5401 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5402 return -EINVAL;
5403 }
5404 }
5405
5406 return 0;
5407}
5408
c21ef3e3
DA		 5409static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5410 struct netlink_ext_ack *extack)
6c223828 5411{
87117baf 5412 struct net *tgt_net = sock_net(in_skb->sk);
203651b6
CB		 5413 struct inet6_fill_args fillargs = {
5414 .portid = NETLINK_CB(in_skb).portid,
5415 .seq = nlh->nlmsg_seq,
5416 .event = RTM_NEWADDR,
5417 .flags = 0,
5418 .netnsid = -1,
5419 };
1b29fc2c
TG		 5420 struct ifaddrmsg *ifm;
5421 struct nlattr *tb[IFA_MAX+1];
caeaba79 5422 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 5423 struct net_device *dev = NULL;
5424 struct inet6_ifaddr *ifa;
5425 struct sk_buff *skb;
6c223828
NT		 5426 int err;
5427
4b1373de 5428 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
1b29fc2c 5429 if (err < 0)
c24675f8 5430 return err;
1b29fc2c 5431
6ecf4c37 5432 if (tb[IFA_TARGET_NETNSID]) {
203651b6 5433 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
6ecf4c37
CB		 5434
5435 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
203651b6 5436 fillargs.netnsid);
6ecf4c37
CB		 5437 if (IS_ERR(tgt_net))
5438 return PTR_ERR(tgt_net);
5439 }
5440
caeaba79 5441 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
c24675f8
FW		 5442 if (!addr)
5443 return -EINVAL;
6c223828 5444
1b29fc2c 5445 ifm = nlmsg_data(nlh);
6c223828 5446 if (ifm->ifa_index)
6ecf4c37 5447 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
6c223828 5448
6ecf4c37 5449 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
e21e8467 5450 if (!ifa) {
1b29fc2c
TG		 5451 err = -EADDRNOTAVAIL;
5452 goto errout;
5453 }
6c223828 5454
e21e8467
SH		 5455 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5456 if (!skb) {
6c223828 5457 err = -ENOBUFS;
1b29fc2c 5458 goto errout_ifa;
6c223828
NT		 5459 }
5460
203651b6 5461 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
26932566
PM		 5462 if (err < 0) {
5463 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5464 WARN_ON(err == -EMSGSIZE);
5465 kfree_skb(skb);
5466 goto errout_ifa;
5467 }
6ecf4c37 5468 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
1b29fc2c 5469errout_ifa:
6c223828 5470 in6_ifa_put(ifa);
1b29fc2c 5471errout:
1160dfa1 5472 dev_put(dev);
203651b6 5473 if (fillargs.netnsid >= 0)
6ecf4c37
CB		 5474 put_net(tgt_net);
5475
6c223828 5476 return err;
6c223828
NT		 5477}
5478
1da177e4
LT		 5479static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5480{
5481 struct sk_buff *skb;
c346dca1 5482 struct net *net = dev_net(ifa->idev->dev);
203651b6
CB		 5483 struct inet6_fill_args fillargs = {
5484 .portid = 0,
5485 .seq = 0,
5486 .event = event,
5487 .flags = 0,
5488 .netnsid = -1,
5489 };
5d620266 5490 int err = -ENOBUFS;
1da177e4 5491
0ab6803b 5492 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 5493 if (!skb)
5d620266
TG		 5494 goto errout;
5495
203651b6 5496 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
26932566
PM		 5497 if (err < 0) {
5498 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5499 WARN_ON(err == -EMSGSIZE);
5500 kfree_skb(skb);
5501 goto errout;
5502 }
1ce85fe4
PNA		 5503 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5504 return;
5d620266
TG		 5505errout:
5506 if (err < 0)
6fda7350 5507 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 5508}
5509
b6f99a21 5510static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 5511 __s32 *array, int bytes)
5512{
04561c1f
TG		 5513 BUG_ON(bytes < (DEVCONF_MAX * 4));
5514
1da177e4
LT		 5515 memset(array, 0, bytes);
5516 array[DEVCONF_FORWARDING] = cnf->forwarding;
5517 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5518 array[DEVCONF_MTU6] = cnf->mtu6;
5519 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5520 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5521 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5522 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5523 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 5524 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5525 jiffies_to_msecs(cnf->rtr_solicit_interval);
bd11f074
MŻ		 5526 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5527 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
93908d19
TG		 5528 array[DEVCONF_RTR_SOLICIT_DELAY] =
5529 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 5530 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 5531 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5532 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5533 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5534 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 5535 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5536 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5537 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5538 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5539 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 5540 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 5541 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
6b2e04bc 5542 array[DEVCONF_RA_DEFRTR_METRIC] = cnf->ra_defrtr_metric;
8013d1d7 5543 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 5544 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 5545#ifdef CONFIG_IPV6_ROUTER_PREF
5546 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 5547 array[DEVCONF_RTR_PROBE_INTERVAL] =
5548 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 5549#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 5550 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
09c884d4
YH		 5551 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5552#endif
930d6ff2 5553#endif
fbea49e1 5554 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 5555 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 5556#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5557 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 5558 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 5559#endif
7bc570c8 5560#ifdef CONFIG_IPV6_MROUTE
145c7a79 5561 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding);
7bc570c8 5562#endif
778d80be 5563 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 5564 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 5565 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 5566 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 5567 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 5568 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 5569 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 5570 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 5571 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 5572 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 5573 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 5574 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 5575 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1ababeba 5576 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
bf355b8d
DL		 5577#ifdef CONFIG_IPV6_SEG6_HMAC
5578 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5579#endif
adc176c5 5580 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
d35a00b8 5581 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
df789fe7 5582 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
2210d6b2 5583 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
8610c7c6 5584 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled;
9ee11f0f
JI		 5585 array[DEVCONF_IOAM6_ENABLED] = cnf->ioam6_enabled;
5586 array[DEVCONF_IOAM6_ID] = cnf->ioam6_id;
5587 array[DEVCONF_IOAM6_ID_WIDE] = cnf->ioam6_id_wide;
18ac597a 5588 array[DEVCONF_NDISC_EVICT_NOCARRIER] = cnf->ndisc_evict_nocarrier;
3e0b8f52 5589 array[DEVCONF_ACCEPT_UNTRACKED_NA] = cnf->accept_untracked_na;
1da177e4
LT		 5590}
5591
b382b191
TG		 5592static inline size_t inet6_ifla6_size(void)
5593{
5594 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5595 + nla_total_size(sizeof(struct ifla_cacheinfo))
5596 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5597 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4 5598 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
bdd72f41
SD		 5599 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5600 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
49b99da2 5601 + nla_total_size(4) /* IFLA_INET6_RA_MTU */
bdd72f41 5602 + 0;
b382b191
TG		 5603}
5604
339bf98f
TG		 5605static inline size_t inet6_if_nlmsg_size(void)
5606{
5607 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5608 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5609 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5610 + nla_total_size(4) /* IFLA_MTU */
5611 + nla_total_size(4) /* IFLA_LINK */
0344338b 5612 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 5613 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 5614}
c5396a31 5615
be281e55 5616static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
aca05671 5617 int bytes)
7f7d9a6b
HX		 5618{
5619 int i;
aca05671 5620 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
7f7d9a6b
HX		 5621 BUG_ON(pad < 0);
5622
5623 /* Use put_unaligned() because stats may not be aligned for u64. */
aca05671
JH		 5624 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5625 for (i = 1; i < ICMP6_MIB_MAX; i++)
be281e55 5626 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b 5627
aca05671 5628 memset(&stats[ICMP6_MIB_MAX], 0, pad);
7f7d9a6b
HX		 5629}
5630
698365fa 5631static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 5632 int bytes, size_t syncpoff)
4ce3c183 5633{
a3a77372
R		 5634 int i, c;
5635 u64 buff[IPSTATS_MIB_MAX];
5636 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5637
4ce3c183
ED		 5638 BUG_ON(pad < 0);
5639
a3a77372
R		 5640 memset(buff, 0, sizeof(buff));
5641 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 5642
a3a77372
R		 5643 for_each_possible_cpu(c) {
5644 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5645 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5646 }
5647
5648 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5649 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 5650}
5651
7f7d9a6b
HX		 5652static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5653 int bytes)
5654{
e21e8467 5655 switch (attrtype) {
7f7d9a6b 5656 case IFLA_INET6_STATS:
a3a77372
R		 5657 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5658 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 5659 break;
5660 case IFLA_INET6_ICMP6STATS:
aca05671 5661 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
7f7d9a6b
HX		 5662 break;
5663 }
5664}
5665
d5566fd7
SV		 5666static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5667 u32 ext_filter_mask)
b382b191
TG		 5668{
5669 struct nlattr *nla;
5670 struct ifla_cacheinfo ci;
5671
c78679e8
DM		 5672 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5673 goto nla_put_failure;
b382b191 5674 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 5675 ci.tstamp = cstamp_delta(idev->tstamp);
5676 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 5677 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 5678 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5679 goto nla_put_failure;
b382b191 5680 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 5681 if (!nla)
b382b191
TG		 5682 goto nla_put_failure;
5683 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5684
5685 /* XXX - MC not implemented */
5686
d5566fd7
SV		 5687 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5688 return 0;
5689
b382b191 5690 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 5691 if (!nla)
b382b191
TG		 5692 goto nla_put_failure;
5693 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5694
5695 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 5696 if (!nla)
b382b191
TG		 5697 goto nla_put_failure;
5698 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5699
f53adae4 5700 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 5701 if (!nla)
f53adae4
DB		 5702 goto nla_put_failure;
5703 read_lock_bh(&idev->lock);
5704 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5705 read_unlock_bh(&idev->lock);
5706
0d7982ce
ND		 5707 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5708 goto nla_put_failure;
5709
49b99da2
RY		 5710 if (idev->ra_mtu &&
5711 nla_put_u32(skb, IFLA_INET6_RA_MTU, idev->ra_mtu))
5712 goto nla_put_failure;
5713
b382b191
TG		 5714 return 0;
5715
5716nla_put_failure:
5717 return -EMSGSIZE;
5718}
5719
b1974ed0
AR		 5720static size_t inet6_get_link_af_size(const struct net_device *dev,
5721 u32 ext_filter_mask)
b382b191
TG		 5722{
5723 if (!__in6_dev_get(dev))
5724 return 0;
5725
5726 return inet6_ifla6_size();
5727}
5728
d5566fd7
SV		 5729static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5730 u32 ext_filter_mask)
b382b191
TG		 5731{
5732 struct inet6_dev *idev = __in6_dev_get(dev);
5733
5734 if (!idev)
5735 return -ENODATA;
5736
d5566fd7 5737 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5738 return -EMSGSIZE;
5739
5740 return 0;
5741}
5742
3583a4e8
SH		 5743static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token,
5744 struct netlink_ext_ack *extack)
f53adae4 5745{
f53adae4
DB		 5746 struct inet6_ifaddr *ifp;
5747 struct net_device *dev = idev->dev;
47e27d5e 5748 bool clear_token, update_rs = false;
dc848292 5749 struct in6_addr ll_addr;
f53adae4 5750
c15b1cca
HFS		 5751 ASSERT_RTNL();
5752
63159f29 5753 if (!token)
f53adae4 5754 return -EINVAL;
3583a4e8
SH		 5755
5756 if (dev->flags & IFF_LOOPBACK) {
5757 NL_SET_ERR_MSG_MOD(extack, "Device is loopback");
f53adae4 5758 return -EINVAL;
3583a4e8
SH		 5759 }
5760
5761 if (dev->flags & IFF_NOARP) {
5762 NL_SET_ERR_MSG_MOD(extack,
5763 "Device does not do neighbour discovery");
5764 return -EINVAL;
5765 }
5766
5767 if (!ipv6_accept_ra(idev)) {
5768 NL_SET_ERR_MSG_MOD(extack,
5769 "Router advertisement is disabled on device");
f53adae4 5770 return -EINVAL;
3583a4e8
SH		 5771 }
5772
5773 if (idev->cnf.rtr_solicits == 0) {
5774 NL_SET_ERR_MSG(extack,
5775 "Router solicitation is disabled on device");
f53adae4 5776 return -EINVAL;
3583a4e8 5777 }
f53adae4
DB		 5778
5779 write_lock_bh(&idev->lock);
5780
5781 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5782 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5783
5784 write_unlock_bh(&idev->lock);
5785
47e27d5e
DB		 5786 clear_token = ipv6_addr_any(token);
5787 if (clear_token)
5788 goto update_lft;
5789
dc848292
HFS		 5790 if (!idev->dead && (idev->if_flags & IF_READY) &&
5791 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5792 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5793 /* If we're not ready, then normal ifup will take care
5794 * of this. Otherwise, we need to request our rs here.
5795 */
5796 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5797 update_rs = true;
5798 }
f53adae4 5799
47e27d5e 5800update_lft:
f53adae4 5801 write_lock_bh(&idev->lock);
fc403832 5802
77ecaace 5803 if (update_rs) {
fc403832 5804 idev->if_flags |= IF_RS_SENT;
bd11f074
MŻ		 5805 idev->rs_interval = rfc3315_s14_backoff_init(
5806 idev->cnf.rtr_solicit_interval);
77ecaace 5807 idev->rs_probes = 1;
bd11f074 5808 addrconf_mod_rs_timer(idev, idev->rs_interval);
77ecaace 5809 }
f53adae4
DB		 5810
5811 /* Well, that's kinda nasty ... */
5812 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5813 spin_lock(&ifp->lock);
617fe29d 5814 if (ifp->tokenized) {
f53adae4
DB		 5815 ifp->valid_lft = 0;
5816 ifp->prefered_lft = 0;
5817 }
5818 spin_unlock(&ifp->lock);
5819 }
5820
5821 write_unlock_bh(&idev->lock);
b2ed64a9 5822 inet6_ifinfo_notify(RTM_NEWLINK, idev);
8805d13f 5823 addrconf_verify_rtnl(dev_net(dev));
f53adae4
DB		 5824 return 0;
5825}
5826
11b1f828
DB		 5827static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5828 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5829 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
49b99da2
RY		 5830 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT,
5831 .reject_message =
5832 "IFLA_INET6_RA_MTU can not be set" },
11b1f828
DB		 5833};
5834
d35a00b8
FJ		 5835static int check_addr_gen_mode(int mode)
5836{
5837 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5838 mode != IN6_ADDR_GEN_MODE_NONE &&
5839 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5840 mode != IN6_ADDR_GEN_MODE_RANDOM)
5841 return -EINVAL;
5842 return 1;
5843}
5844
5845static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5846 int mode)
5847{
5848 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5849 !idev->cnf.stable_secret.initialized &&
5850 !net->ipv6.devconf_dflt->stable_secret.initialized)
5851 return -EINVAL;
5852 return 1;
5853}
5854
7dc2bcca 5855static int inet6_validate_link_af(const struct net_device *dev,
8679c31e
RY		 5856 const struct nlattr *nla,
5857 struct netlink_ext_ack *extack)
7dc2bcca
MM		 5858{
5859 struct nlattr *tb[IFLA_INET6_MAX + 1];
5860 struct inet6_dev *idev = NULL;
5861 int err;
5862
5863 if (dev) {
5864 idev = __in6_dev_get(dev);
5865 if (!idev)
5866 return -EAFNOSUPPORT;
5867 }
5868
5869 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
8679c31e 5870 inet6_af_policy, extack);
7dc2bcca
MM		 5871 if (err)
5872 return err;
5873
5874 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5875 return -EINVAL;
5876
5877 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5878 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5879
5880 if (check_addr_gen_mode(mode) < 0)
5881 return -EINVAL;
5882 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5883 return -EINVAL;
5884 }
5885
5886 return 0;
5887}
5888
3583a4e8
SH		 5889static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla,
5890 struct netlink_ext_ack *extack)
f53adae4 5891{
f53adae4
DB		 5892 struct inet6_dev *idev = __in6_dev_get(dev);
5893 struct nlattr *tb[IFLA_INET6_MAX + 1];
7dc2bcca 5894 int err;
f53adae4 5895
db3fa271
ED		 5896 if (!idev)
5897 return -EAFNOSUPPORT;
5898
8cb08174 5899 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5ac6b198 5900 return -EINVAL;
f53adae4 5901
bc91b0f0 5902 if (tb[IFLA_INET6_TOKEN]) {
3583a4e8
SH		 5903 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]),
5904 extack);
bc91b0f0
JP		 5905 if (err)
5906 return err;
5907 }
5908
5909 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5910 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5911
d35a00b8 5912 idev->cnf.addr_gen_mode = mode;
bc91b0f0 5913 }
f53adae4 5914
7dc2bcca 5915 return 0;
f53adae4
DB		 5916}
5917
1ab1457c 5918static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5919 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5920{
04561c1f 5921 struct net_device *dev = idev->dev;
04561c1f
TG		 5922 struct ifinfomsg *hdr;
5923 struct nlmsghdr *nlh;
5924 void *protoinfo;
04561c1f 5925
15e47304 5926 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5927 if (!nlh)
26932566 5928 return -EMSGSIZE;
04561c1f
TG		 5929
5930 hdr = nlmsg_data(nlh);
5931 hdr->ifi_family = AF_INET6;
5932 hdr->__ifi_pad = 0;
5933 hdr->ifi_type = dev->type;
5934 hdr->ifi_index = dev->ifindex;
5935 hdr->ifi_flags = dev_get_flags(dev);
5936 hdr->ifi_change = 0;
5937
c78679e8
DM		 5938 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5939 (dev->addr_len &&
5940 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5941 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5942 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5943 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5944 nla_put_u8(skb, IFLA_OPERSTATE,
5945 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5946 goto nla_put_failure;
ae0be8de 5947 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
63159f29 5948 if (!protoinfo)
04561c1f 5949 goto nla_put_failure;
1da177e4 5950
d5566fd7 5951 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5952 goto nla_put_failure;
1da177e4 5953
04561c1f 5954 nla_nest_end(skb, protoinfo);
053c095a
JB		 5955 nlmsg_end(skb, nlh);
5956 return 0;
1da177e4 5957
04561c1f 5958nla_put_failure:
26932566
PM		 5959 nlmsg_cancel(skb, nlh);
5960 return -EMSGSIZE;
1da177e4
LT		 5961}
5962
786e0007
DA		 5963static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5964 struct netlink_ext_ack *extack)
5965{
5966 struct ifinfomsg *ifm;
5967
5968 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5969 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5970 return -EINVAL;
5971 }
5972
5973 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5974 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5975 return -EINVAL;
5976 }
5977
5978 ifm = nlmsg_data(nlh);
5979 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5980 ifm->ifi_change || ifm->ifi_index) {
5981 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5982 return -EINVAL;
5983 }
5984
5985 return 0;
5986}
5987
1da177e4
LT		 5988static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5989{
3b1e0a65 5990 struct net *net = sock_net(skb->sk);
84d2697d 5991 int h, s_h;
434a8a58 5992 int idx = 0, s_idx;
1da177e4
LT		 5993 struct net_device *dev;
5994 struct inet6_dev *idev;
84d2697d 5995 struct hlist_head *head;
1da177e4 5996
786e0007
DA		 5997 /* only requests using strict checking can pass data to
5998 * influence the dump
5999 */
6000 if (cb->strict_check) {
6001 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
6002
6003 if (err < 0)
6004 return err;
6005 }
6006
84d2697d
ED		 6007 s_h = cb->args[0];
6008 s_idx = cb->args[1];
6009
6010 rcu_read_lock();
6011 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
6012 idx = 0;
6013 head = &net->dev_index_head[h];
b67bfe0d 6014 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 6015 if (idx < s_idx)
6016 goto cont;
6017 idev = __in6_dev_get(dev);
6018 if (!idev)
6019 goto cont;
6020 if (inet6_fill_ifinfo(skb, idev,
15e47304 6021 NETLINK_CB(cb->skb).portid,
84d2697d 6022 cb->nlh->nlmsg_seq,
053c095a 6023 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 6024 goto out;
7562f876 6025cont:
84d2697d
ED		 6026 idx++;
6027 }
1da177e4 6028 }
84d2697d
ED		 6029out:
6030 rcu_read_unlock();
6031 cb->args[1] = idx;
6032 cb->args[0] = h;
1da177e4
LT		 6033
6034 return skb->len;
6035}
6036
6037void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
6038{
6039 struct sk_buff *skb;
c346dca1 6040 struct net *net = dev_net(idev->dev);
8d7a76c9 6041 int err = -ENOBUFS;
1ab1457c 6042
339bf98f 6043 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 6044 if (!skb)
8d7a76c9
TG		 6045 goto errout;
6046
6047 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 6048 if (err < 0) {
6049 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
6050 WARN_ON(err == -EMSGSIZE);
6051 kfree_skb(skb);
6052 goto errout;
6053 }
5f75a104 6054 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 6055 return;
8d7a76c9
TG		 6056errout:
6057 if (err < 0)
5f75a104 6058 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 6059}
6060
339bf98f
TG		 6061static inline size_t inet6_prefix_nlmsg_size(void)
6062{
6063 return NLMSG_ALIGN(sizeof(struct prefixmsg))
6064 + nla_total_size(sizeof(struct in6_addr))
6065 + nla_total_size(sizeof(struct prefix_cacheinfo));
6066}
c5396a31 6067
1da177e4 6068static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 6069 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 6070 int event, unsigned int flags)
1da177e4 6071{
6051e2f4
TG		 6072 struct prefixmsg *pmsg;
6073 struct nlmsghdr *nlh;
1da177e4
LT		 6074 struct prefix_cacheinfo ci;
6075
15e47304 6076 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 6077 if (!nlh)
26932566 6078 return -EMSGSIZE;
6051e2f4
TG		 6079
6080 pmsg = nlmsg_data(nlh);
1da177e4 6081 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 6082 pmsg->prefix_pad1 = 0;
6083 pmsg->prefix_pad2 = 0;
1da177e4
LT		 6084 pmsg->prefix_ifindex = idev->dev->ifindex;
6085 pmsg->prefix_len = pinfo->prefix_len;
6086 pmsg->prefix_type = pinfo->type;
8a47077a 6087 pmsg->prefix_pad3 = 0;
1da177e4
LT		 6088 pmsg->prefix_flags = 0;
6089 if (pinfo->onlink)
6090 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
6091 if (pinfo->autoconf)
6092 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
6093
c78679e8
DM		 6094 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
6095 goto nla_put_failure;
1da177e4
LT		 6096 ci.preferred_time = ntohl(pinfo->prefered);
6097 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 6098 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
6099 goto nla_put_failure;
053c095a
JB		 6100 nlmsg_end(skb, nlh);
6101 return 0;
1da177e4 6102
6051e2f4 6103nla_put_failure:
26932566
PM		 6104 nlmsg_cancel(skb, nlh);
6105 return -EMSGSIZE;
1da177e4
LT		 6106}
6107
1ab1457c 6108static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 6109 struct prefix_info *pinfo)
6110{
6111 struct sk_buff *skb;
c346dca1 6112 struct net *net = dev_net(idev->dev);
8c384bfa 6113 int err = -ENOBUFS;
1da177e4 6114
339bf98f 6115 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 6116 if (!skb)
8c384bfa
TG		 6117 goto errout;
6118
6119 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 6120 if (err < 0) {
6121 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6122 WARN_ON(err == -EMSGSIZE);
6123 kfree_skb(skb);
6124 goto errout;
6125 }
1ce85fe4
PNA		 6126 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6127 return;
8c384bfa
TG		 6128errout:
6129 if (err < 0)
6fda7350 6130 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 6131}
6132
1da177e4
LT		 6133static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6134{
63998ac2
ND		 6135 struct net *net = dev_net(ifp->idev->dev);
6136
c15b1cca
HFS		 6137 if (event)
6138 ASSERT_RTNL();
6139
1da177e4
LT		 6140 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6141
6142 switch (event) {
6143 case RTM_NEWADDR:
95c385b4 6144 /*
2d819d25
DA		 6145 * If the address was optimistic we inserted the route at the
6146 * start of our DAD process, so we don't need to do it again.
6147 * If the device was taken down in the middle of the DAD
6148 * cycle there is a race where we could get here without a
6149 * host route, so nothing to insert. That will be fixed when
6150 * the device is brought up.
95c385b4 6151 */
2d819d25 6152 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
afb1d4b5 6153 ip6_ins_rt(net, ifp->rt);
2d819d25
DA		 6154 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6155 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6156 &ifp->addr, ifp->idev->dev->name);
6157 }
6158
1da177e4
LT		 6159 if (ifp->idev->cnf.forwarding)
6160 addrconf_join_anycast(ifp);
7996c799 6161 if (!ipv6_addr_any(&ifp->peer_addr))
07758eb9
HL		 6162 addrconf_prefix_route(&ifp->peer_addr, 128,
6163 ifp->rt_priority, ifp->idev->dev,
6164 0, 0, GFP_ATOMIC);
1da177e4
LT		 6165 break;
6166 case RTM_DELADDR:
6167 if (ifp->idev->cnf.forwarding)
6168 addrconf_leave_anycast(ifp);
6169 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 6170 if (!ipv6_addr_any(&ifp->peer_addr)) {
8d1c802b 6171 struct fib6_info *rt;
caeaba79 6172
e7478dfc 6173 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
2b2450ca
DA		 6174 ifp->idev->dev, 0, 0,
6175 false);
8e3d5be7 6176 if (rt)
11dd74b3 6177 ip6_del_rt(net, rt, false);
caeaba79 6178 }
38bd10c4 6179 if (ifp->rt) {
11dd74b3 6180 ip6_del_rt(net, ifp->rt, false);
93531c67 6181 ifp->rt = NULL;
38bd10c4 6182 }
705f1c86 6183 rt_genid_bump_ipv6(net);
1da177e4
LT		 6184 break;
6185 }
63998ac2 6186 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 6187}
6188
6189static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6190{
1da177e4
LT		 6191 if (likely(ifp->idev->dead == 0))
6192 __ipv6_ifa_notify(event, ifp);
1da177e4
LT		 6193}
6194
6195#ifdef CONFIG_SYSCTL
6196
32927393
CH		 6197static int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6198 void *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 6199{
6200 int *valp = ctl->data;
6201 int val = *valp;
88af182e 6202 loff_t pos = *ppos;
fe2c6338 6203 struct ctl_table lctl;
1da177e4
LT		 6204 int ret;
6205
013d97e9
FR		 6206 /*
6207 * ctl->data points to idev->cnf.forwarding, we should
6208 * not modify it until we get the rtnl lock.
6209 */
6210 lctl = *ctl;
6211 lctl.data = &val;
6212
6213 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 6214
c8fecf22 6215 if (write)
b325fddb 6216 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 6217 if (ret)
6218 *ppos = pos;
1ab1457c 6219 return ret;
1da177e4
LT		 6220}
6221
32927393
CH		 6222static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6223 void *buffer, size_t *lenp, loff_t *ppos)
77751427
ML		 6224{
6225 struct inet6_dev *idev = ctl->extra1;
6226 int min_mtu = IPV6_MIN_MTU;
6227 struct ctl_table lctl;
6228
6229 lctl = *ctl;
6230 lctl.extra1 = &min_mtu;
6231 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6232
6233 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6234}
6235
56d417b1
BH		 6236static void dev_disable_change(struct inet6_dev *idev)
6237{
75538c2b
CW		 6238 struct netdev_notifier_info info;
6239
56d417b1
BH		 6240 if (!idev || !idev->dev)
6241 return;
6242
75538c2b 6243 netdev_notifier_info_init(&info, idev->dev);
56d417b1 6244 if (idev->cnf.disable_ipv6)
75538c2b 6245 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 6246 else
75538c2b 6247 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 6248}
6249
6250static void addrconf_disable_change(struct net *net, __s32 newf)
6251{
6252 struct net_device *dev;
6253 struct inet6_dev *idev;
6254
03e4deff 6255 for_each_netdev(net, dev) {
56d417b1
BH		 6256 idev = __in6_dev_get(dev);
6257 if (idev) {
6258 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6259 idev->cnf.disable_ipv6 = newf;
6260 if (changed)
6261 dev_disable_change(idev);
6262 }
56d417b1 6263 }
56d417b1
BH		 6264}
6265
013d97e9 6266static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 6267{
6268 struct net *net;
013d97e9
FR		 6269 int old;
6270
6271 if (!rtnl_trylock())
6272 return restart_syscall();
56d417b1
BH		 6273
6274 net = (struct net *)table->extra2;
013d97e9
FR		 6275 old = *p;
6276 *p = newf;
56d417b1 6277
013d97e9
FR		 6278 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6279 rtnl_unlock();
56d417b1 6280 return 0;
88af182e 6281 }
56d417b1
BH		 6282
6283 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 6284 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6285 addrconf_disable_change(net, newf);
013d97e9 6286 } else if ((!newf) ^ (!old))
56d417b1
BH		 6287 dev_disable_change((struct inet6_dev *)table->extra1);
6288
6289 rtnl_unlock();
6290 return 0;
6291}
6292
32927393
CH		 6293static int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6294 void *buffer, size_t *lenp, loff_t *ppos)
56d417b1
BH		 6295{
6296 int *valp = ctl->data;
6297 int val = *valp;
88af182e 6298 loff_t pos = *ppos;
fe2c6338 6299 struct ctl_table lctl;
56d417b1
BH		 6300 int ret;
6301
013d97e9
FR		 6302 /*
6303 * ctl->data points to idev->cnf.disable_ipv6, we should
6304 * not modify it until we get the rtnl lock.
6305 */
6306 lctl = *ctl;
6307 lctl.data = &val;
6308
6309 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 6310
6311 if (write)
6312 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 6313 if (ret)
6314 *ppos = pos;
56d417b1
BH		 6315 return ret;
6316}
6317
32927393
CH		 6318static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6319 void *buffer, size_t *lenp, loff_t *ppos)
c92d5491 6320{
6321 int *valp = ctl->data;
6322 int ret;
6323 int old, new;
6324
6325 old = *valp;
6326 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6327 new = *valp;
6328
6329 if (write && old != new) {
6330 struct net *net = ctl->extra2;
6331
6332 if (!rtnl_trylock())
6333 return restart_syscall();
6334
6335 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
85b3daad
DA		 6336 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6337 NETCONFA_PROXY_NEIGH,
c92d5491 6338 NETCONFA_IFINDEX_DEFAULT,
6339 net->ipv6.devconf_dflt);
6340 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
85b3daad
DA		 6341 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6342 NETCONFA_PROXY_NEIGH,
c92d5491 6343 NETCONFA_IFINDEX_ALL,
6344 net->ipv6.devconf_all);
6345 else {
6346 struct inet6_dev *idev = ctl->extra1;
6347
85b3daad
DA		 6348 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6349 NETCONFA_PROXY_NEIGH,
c92d5491 6350 idev->dev->ifindex,
6351 &idev->cnf);
6352 }
6353 rtnl_unlock();
6354 }
6355
6356 return ret;
6357}
6358
d35a00b8 6359static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
32927393 6360 void *buffer, size_t *lenp,
d35a00b8
FJ		 6361 loff_t *ppos)
6362{
6363 int ret = 0;
c6dbf7aa 6364 u32 new_val;
d35a00b8
FJ		 6365 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6366 struct net *net = (struct net *)ctl->extra2;
c6dbf7aa
SD		 6367 struct ctl_table tmp = {
6368 .data = &new_val,
6369 .maxlen = sizeof(new_val),
6370 .mode = ctl->mode,
6371 };
d35a00b8 6372
8c171d6c
FJ		 6373 if (!rtnl_trylock())
6374 return restart_syscall();
6375
c6dbf7aa 6376 new_val = *((u32 *)ctl->data);
d35a00b8 6377
c6dbf7aa
SD		 6378 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6379 if (ret != 0)
6380 goto out;
d35a00b8 6381
c6dbf7aa 6382 if (write) {
8c171d6c
FJ		 6383 if (check_addr_gen_mode(new_val) < 0) {
6384 ret = -EINVAL;
6385 goto out;
6386 }
d35a00b8 6387
c6dbf7aa 6388 if (idev) {
8c171d6c
FJ		 6389 if (check_stable_privacy(idev, net, new_val) < 0) {
6390 ret = -EINVAL;
6391 goto out;
6392 }
d35a00b8
FJ		 6393
6394 if (idev->cnf.addr_gen_mode != new_val) {
6395 idev->cnf.addr_gen_mode = new_val;
d35a00b8 6396 addrconf_dev_config(idev->dev);
d35a00b8 6397 }
f24c5987
SD		 6398 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6399 struct net_device *dev;
6400
6401 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6402 for_each_netdev(net, dev) {
6403 idev = __in6_dev_get(dev);
6404 if (idev &&
6405 idev->cnf.addr_gen_mode != new_val) {
6406 idev->cnf.addr_gen_mode = new_val;
6407 addrconf_dev_config(idev->dev);
6408 }
6409 }
d35a00b8 6410 }
c6dbf7aa
SD		 6411
6412 *((u32 *)ctl->data) = new_val;
d35a00b8
FJ		 6413 }
6414
8c171d6c
FJ		 6415out:
6416 rtnl_unlock();
6417
d35a00b8
FJ		 6418 return ret;
6419}
6420
3d1bec99 6421static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
32927393 6422 void *buffer, size_t *lenp,
3d1bec99
HFS		 6423 loff_t *ppos)
6424{
6425 int err;
6426 struct in6_addr addr;
6427 char str[IPV6_MAX_STRLEN];
6428 struct ctl_table lctl = *ctl;
622c81d5 6429 struct net *net = ctl->extra2;
3d1bec99
HFS		 6430 struct ipv6_stable_secret *secret = ctl->data;
6431
622c81d5
HFS		 6432 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6433 return -EIO;
6434
3d1bec99
HFS		 6435 lctl.maxlen = IPV6_MAX_STRLEN;
6436 lctl.data = str;
6437
6438 if (!rtnl_trylock())
6439 return restart_syscall();
6440
6441 if (!write && !secret->initialized) {
6442 err = -EIO;
6443 goto out;
6444 }
6445
5449a5ca
WC		 6446 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6447 if (err >= sizeof(str)) {
6448 err = -EIO;
6449 goto out;
3d1bec99
HFS		 6450 }
6451
6452 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6453 if (err || !write)
6454 goto out;
6455
6456 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6457 err = -EIO;
6458 goto out;
6459 }
6460
6461 secret->initialized = true;
6462 secret->secret = addr;
6463
622c81d5
HFS		 6464 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6465 struct net_device *dev;
6466
6467 for_each_netdev(net, dev) {
6468 struct inet6_dev *idev = __in6_dev_get(dev);
6469
6470 if (idev) {
d35a00b8 6471 idev->cnf.addr_gen_mode =
622c81d5
HFS		 6472 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6473 }
6474 }
6475 } else {
6476 struct inet6_dev *idev = ctl->extra1;
6477
d35a00b8 6478 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
622c81d5
HFS		 6479 }
6480
3d1bec99
HFS		 6481out:
6482 rtnl_unlock();
6483
6484 return err;
6485}
c92d5491 6486
35103d11
AG		 6487static
6488int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
32927393 6489 int write, void *buffer,
35103d11
AG		 6490 size_t *lenp,
6491 loff_t *ppos)
6492{
6493 int *valp = ctl->data;
6494 int val = *valp;
6495 loff_t pos = *ppos;
6496 struct ctl_table lctl;
6497 int ret;
6498
6499 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6500 * we should not modify it until we get the rtnl lock.
6501 */
6502 lctl = *ctl;
6503 lctl.data = &val;
6504
6505 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6506
6507 if (write)
6508 ret = addrconf_fixup_linkdown(ctl, valp, val);
6509 if (ret)
6510 *ppos = pos;
6511 return ret;
6512}
6513
df789fe7
DF		 6514static
6515void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6516{
6517 if (rt) {
6518 if (action)
6519 rt->dst.flags |= DST_NOPOLICY;
6520 else
6521 rt->dst.flags &= ~DST_NOPOLICY;
6522 }
6523}
6524
6525static
6526void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6527{
6528 struct inet6_ifaddr *ifa;
6529
6530 read_lock_bh(&idev->lock);
6531 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6532 spin_lock(&ifa->lock);
6533 if (ifa->rt) {
f88d8ea6 6534 /* host routes only use builtin fib6_nh */
1cf844c7 6535 struct fib6_nh *nh = ifa->rt->fib6_nh;
df789fe7
DF		 6536 int cpu;
6537
66f5d6ce 6538 rcu_read_lock();
3b6761d1 6539 ifa->rt->dst_nopolicy = val ? true : false;
f40b6ae2 6540 if (nh->rt6i_pcpu) {
df789fe7
DF		 6541 for_each_possible_cpu(cpu) {
6542 struct rt6_info **rtp;
6543
f40b6ae2 6544 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
df789fe7
DF		 6545 addrconf_set_nopolicy(*rtp, val);
6546 }
6547 }
66f5d6ce 6548 rcu_read_unlock();
df789fe7
DF		 6549 }
6550 spin_unlock(&ifa->lock);
6551 }
6552 read_unlock_bh(&idev->lock);
6553}
6554
6555static
6556int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6557{
6558 struct inet6_dev *idev;
6559 struct net *net;
6560
6561 if (!rtnl_trylock())
6562 return restart_syscall();
6563
6564 *valp = val;
6565
6566 net = (struct net *)ctl->extra2;
6567 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6568 rtnl_unlock();
6569 return 0;
6570 }
6571
6572 if (valp == &net->ipv6.devconf_all->disable_policy) {
6573 struct net_device *dev;
6574
6575 for_each_netdev(net, dev) {
6576 idev = __in6_dev_get(dev);
6577 if (idev)
6578 addrconf_disable_policy_idev(idev, val);
6579 }
6580 } else {
6581 idev = (struct inet6_dev *)ctl->extra1;
6582 addrconf_disable_policy_idev(idev, val);
6583 }
6584
6585 rtnl_unlock();
6586 return 0;
6587}
6588
32927393
CH		 6589static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6590 void *buffer, size_t *lenp, loff_t *ppos)
df789fe7
DF		 6591{
6592 int *valp = ctl->data;
6593 int val = *valp;
6594 loff_t pos = *ppos;
6595 struct ctl_table lctl;
6596 int ret;
6597
6598 lctl = *ctl;
6599 lctl.data = &val;
6600 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6601
6602 if (write && (*valp != val))
6603 ret = addrconf_disable_policy(ctl, valp, val);
6604
6605 if (ret)
6606 *ppos = pos;
6607
6608 return ret;
6609}
6610
cb4a4c69 6611static int minus_one = -1;
cb9e684e 6612static const int two_five_five = 255;
176f716c 6613static u32 ioam6_if_id_max = U16_MAX;
cb9e684e 6614
607ea7cd 6615static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 6616 {
6617 .procname = "forwarding",
6618 .data = &ipv6_devconf.forwarding,
6619 .maxlen = sizeof(int),
6620 .mode = 0644,
6621 .proc_handler = addrconf_sysctl_forward,
6622 },
6623 {
6624 .procname = "hop_limit",
6625 .data = &ipv6_devconf.hop_limit,
6626 .maxlen = sizeof(int),
6627 .mode = 0644,
cb9e684e 6628 .proc_handler = proc_dointvec_minmax,
eec4844f 6629 .extra1 = (void *)SYSCTL_ONE,
cb9e684e 6630 .extra2 = (void *)&two_five_five,
5df1f77f
KK		 6631 },
6632 {
6633 .procname = "mtu",
6634 .data = &ipv6_devconf.mtu6,
6635 .maxlen = sizeof(int),
6636 .mode = 0644,
6637 .proc_handler = addrconf_sysctl_mtu,
6638 },
6639 {
6640 .procname = "accept_ra",
6641 .data = &ipv6_devconf.accept_ra,
6642 .maxlen = sizeof(int),
6643 .mode = 0644,
6644 .proc_handler = proc_dointvec,
6645 },
6646 {
6647 .procname = "accept_redirects",
6648 .data = &ipv6_devconf.accept_redirects,
6649 .maxlen = sizeof(int),
6650 .mode = 0644,
6651 .proc_handler = proc_dointvec,
6652 },
6653 {
6654 .procname = "autoconf",
6655 .data = &ipv6_devconf.autoconf,
6656 .maxlen = sizeof(int),
6657 .mode = 0644,
6658 .proc_handler = proc_dointvec,
6659 },
6660 {
6661 .procname = "dad_transmits",
6662 .data = &ipv6_devconf.dad_transmits,
6663 .maxlen = sizeof(int),
6664 .mode = 0644,
6665 .proc_handler = proc_dointvec,
6666 },
6667 {
6668 .procname = "router_solicitations",
6669 .data = &ipv6_devconf.rtr_solicits,
6670 .maxlen = sizeof(int),
6671 .mode = 0644,
cb4a4c69
MŻ		 6672 .proc_handler = proc_dointvec_minmax,
6673 .extra1 = &minus_one,
5df1f77f
KK		 6674 },
6675 {
6676 .procname = "router_solicitation_interval",
6677 .data = &ipv6_devconf.rtr_solicit_interval,
6678 .maxlen = sizeof(int),
6679 .mode = 0644,
6680 .proc_handler = proc_dointvec_jiffies,
6681 },
bd11f074
MŻ		 6682 {
6683 .procname = "router_solicitation_max_interval",
6684 .data = &ipv6_devconf.rtr_solicit_max_interval,
6685 .maxlen = sizeof(int),
6686 .mode = 0644,
6687 .proc_handler = proc_dointvec_jiffies,
6688 },
5df1f77f
KK		 6689 {
6690 .procname = "router_solicitation_delay",
6691 .data = &ipv6_devconf.rtr_solicit_delay,
6692 .maxlen = sizeof(int),
6693 .mode = 0644,
6694 .proc_handler = proc_dointvec_jiffies,
6695 },
6696 {
6697 .procname = "force_mld_version",
6698 .data = &ipv6_devconf.force_mld_version,
6699 .maxlen = sizeof(int),
6700 .mode = 0644,
6701 .proc_handler = proc_dointvec,
6702 },
6703 {
6704 .procname = "mldv1_unsolicited_report_interval",
6705 .data =
6706 &ipv6_devconf.mldv1_unsolicited_report_interval,
6707 .maxlen = sizeof(int),
6708 .mode = 0644,
6709 .proc_handler = proc_dointvec_ms_jiffies,
6710 },
6711 {
6712 .procname = "mldv2_unsolicited_report_interval",
6713 .data =
6714 &ipv6_devconf.mldv2_unsolicited_report_interval,
6715 .maxlen = sizeof(int),
6716 .mode = 0644,
6717 .proc_handler = proc_dointvec_ms_jiffies,
6718 },
6719 {
6720 .procname = "use_tempaddr",
6721 .data = &ipv6_devconf.use_tempaddr,
6722 .maxlen = sizeof(int),
6723 .mode = 0644,
6724 .proc_handler = proc_dointvec,
6725 },
6726 {
6727 .procname = "temp_valid_lft",
6728 .data = &ipv6_devconf.temp_valid_lft,
6729 .maxlen = sizeof(int),
6730 .mode = 0644,
6731 .proc_handler = proc_dointvec,
6732 },
6733 {
6734 .procname = "temp_prefered_lft",
6735 .data = &ipv6_devconf.temp_prefered_lft,
6736 .maxlen = sizeof(int),
6737 .mode = 0644,
6738 .proc_handler = proc_dointvec,
6739 },
6740 {
6741 .procname = "regen_max_retry",
6742 .data = &ipv6_devconf.regen_max_retry,
6743 .maxlen = sizeof(int),
6744 .mode = 0644,
6745 .proc_handler = proc_dointvec,
6746 },
6747 {
6748 .procname = "max_desync_factor",
6749 .data = &ipv6_devconf.max_desync_factor,
6750 .maxlen = sizeof(int),
6751 .mode = 0644,
6752 .proc_handler = proc_dointvec,
6753 },
6754 {
6755 .procname = "max_addresses",
6756 .data = &ipv6_devconf.max_addresses,
6757 .maxlen = sizeof(int),
6758 .mode = 0644,
6759 .proc_handler = proc_dointvec,
6760 },
6761 {
6762 .procname = "accept_ra_defrtr",
6763 .data = &ipv6_devconf.accept_ra_defrtr,
6764 .maxlen = sizeof(int),
6765 .mode = 0644,
6766 .proc_handler = proc_dointvec,
6767 },
6b2e04bc
PC		 6768 {
6769 .procname = "ra_defrtr_metric",
6770 .data = &ipv6_devconf.ra_defrtr_metric,
6771 .maxlen = sizeof(u32),
6772 .mode = 0644,
6773 .proc_handler = proc_douintvec_minmax,
6774 .extra1 = (void *)SYSCTL_ONE,
6775 },
5df1f77f
KK		 6776 {
6777 .procname = "accept_ra_min_hop_limit",
6778 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6779 .maxlen = sizeof(int),
6780 .mode = 0644,
6781 .proc_handler = proc_dointvec,
6782 },
6783 {
6784 .procname = "accept_ra_pinfo",
6785 .data = &ipv6_devconf.accept_ra_pinfo,
6786 .maxlen = sizeof(int),
6787 .mode = 0644,
6788 .proc_handler = proc_dointvec,
6789 },
930d6ff2 6790#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 6791 {
6792 .procname = "accept_ra_rtr_pref",
6793 .data = &ipv6_devconf.accept_ra_rtr_pref,
6794 .maxlen = sizeof(int),
6795 .mode = 0644,
6796 .proc_handler = proc_dointvec,
6797 },
6798 {
6799 .procname = "router_probe_interval",
6800 .data = &ipv6_devconf.rtr_probe_interval,
6801 .maxlen = sizeof(int),
6802 .mode = 0644,
6803 .proc_handler = proc_dointvec_jiffies,
6804 },
fa03ef38 6805#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b
JS		 6806 {
6807 .procname = "accept_ra_rt_info_min_plen",
6808 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6809 .maxlen = sizeof(int),
6810 .mode = 0644,
6811 .proc_handler = proc_dointvec,
6812 },
5df1f77f
KK		 6813 {
6814 .procname = "accept_ra_rt_info_max_plen",
6815 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6816 .maxlen = sizeof(int),
6817 .mode = 0644,
6818 .proc_handler = proc_dointvec,
6819 },
09c884d4 6820#endif
930d6ff2 6821#endif
5df1f77f
KK		 6822 {
6823 .procname = "proxy_ndp",
6824 .data = &ipv6_devconf.proxy_ndp,
6825 .maxlen = sizeof(int),
6826 .mode = 0644,
6827 .proc_handler = addrconf_sysctl_proxy_ndp,
6828 },
6829 {
6830 .procname = "accept_source_route",
6831 .data = &ipv6_devconf.accept_source_route,
6832 .maxlen = sizeof(int),
6833 .mode = 0644,
6834 .proc_handler = proc_dointvec,
6835 },
95c385b4 6836#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 6837 {
6838 .procname = "optimistic_dad",
6839 .data = &ipv6_devconf.optimistic_dad,
6840 .maxlen = sizeof(int),
6841 .mode = 0644,
6842 .proc_handler = proc_dointvec,
6843 },
6844 {
6845 .procname = "use_optimistic",
6846 .data = &ipv6_devconf.use_optimistic,
6847 .maxlen = sizeof(int),
6848 .mode = 0644,
6849 .proc_handler = proc_dointvec,
6850 },
7bc570c8
YH		 6851#endif
6852#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 6853 {
6854 .procname = "mc_forwarding",
6855 .data = &ipv6_devconf.mc_forwarding,
6856 .maxlen = sizeof(int),
6857 .mode = 0444,
6858 .proc_handler = proc_dointvec,
6859 },
95c385b4 6860#endif
5df1f77f
KK		 6861 {
6862 .procname = "disable_ipv6",
6863 .data = &ipv6_devconf.disable_ipv6,
6864 .maxlen = sizeof(int),
6865 .mode = 0644,
6866 .proc_handler = addrconf_sysctl_disable,
6867 },
6868 {
6869 .procname = "accept_dad",
6870 .data = &ipv6_devconf.accept_dad,
6871 .maxlen = sizeof(int),
6872 .mode = 0644,
6873 .proc_handler = proc_dointvec,
6874 },
6875 {
6876 .procname = "force_tllao",
6877 .data = &ipv6_devconf.force_tllao,
6878 .maxlen = sizeof(int),
6879 .mode = 0644,
6880 .proc_handler = proc_dointvec
6881 },
6882 {
6883 .procname = "ndisc_notify",
6884 .data = &ipv6_devconf.ndisc_notify,
6885 .maxlen = sizeof(int),
6886 .mode = 0644,
6887 .proc_handler = proc_dointvec
6888 },
6889 {
6890 .procname = "suppress_frag_ndisc",
6891 .data = &ipv6_devconf.suppress_frag_ndisc,
6892 .maxlen = sizeof(int),
6893 .mode = 0644,
6894 .proc_handler = proc_dointvec
6895 },
6896 {
6897 .procname = "accept_ra_from_local",
6898 .data = &ipv6_devconf.accept_ra_from_local,
6899 .maxlen = sizeof(int),
6900 .mode = 0644,
6901 .proc_handler = proc_dointvec,
6902 },
6903 {
6904 .procname = "accept_ra_mtu",
6905 .data = &ipv6_devconf.accept_ra_mtu,
6906 .maxlen = sizeof(int),
6907 .mode = 0644,
6908 .proc_handler = proc_dointvec,
6909 },
6910 {
6911 .procname = "stable_secret",
6912 .data = &ipv6_devconf.stable_secret,
6913 .maxlen = IPV6_MAX_STRLEN,
6914 .mode = 0600,
6915 .proc_handler = addrconf_sysctl_stable_secret,
6916 },
6917 {
6918 .procname = "use_oif_addrs_only",
6919 .data = &ipv6_devconf.use_oif_addrs_only,
6920 .maxlen = sizeof(int),
6921 .mode = 0644,
6922 .proc_handler = proc_dointvec,
6923 },
6924 {
6925 .procname = "ignore_routes_with_linkdown",
6926 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6927 .maxlen = sizeof(int),
6928 .mode = 0644,
6929 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6930 },
6931 {
6932 .procname = "drop_unicast_in_l2_multicast",
6933 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6934 .maxlen = sizeof(int),
6935 .mode = 0644,
6936 .proc_handler = proc_dointvec,
6937 },
6938 {
6939 .procname = "drop_unsolicited_na",
6940 .data = &ipv6_devconf.drop_unsolicited_na,
6941 .maxlen = sizeof(int),
6942 .mode = 0644,
6943 .proc_handler = proc_dointvec,
6944 },
6945 {
6946 .procname = "keep_addr_on_down",
6947 .data = &ipv6_devconf.keep_addr_on_down,
6948 .maxlen = sizeof(int),
6949 .mode = 0644,
6950 .proc_handler = proc_dointvec,
6951
6952 },
1ababeba
DL		 6953 {
6954 .procname = "seg6_enabled",
6955 .data = &ipv6_devconf.seg6_enabled,
6956 .maxlen = sizeof(int),
6957 .mode = 0644,
6958 .proc_handler = proc_dointvec,
6959 },
bf355b8d
DL		 6960#ifdef CONFIG_IPV6_SEG6_HMAC
6961 {
6962 .procname = "seg6_require_hmac",
6963 .data = &ipv6_devconf.seg6_require_hmac,
6964 .maxlen = sizeof(int),
6965 .mode = 0644,
6966 .proc_handler = proc_dointvec,
6967 },
6968#endif
adc176c5
EN		 6969 {
6970 .procname = "enhanced_dad",
6971 .data = &ipv6_devconf.enhanced_dad,
6972 .maxlen = sizeof(int),
6973 .mode = 0644,
6974 .proc_handler = proc_dointvec,
6975 },
d35a00b8 6976 {
12e64b3b
RY		 6977 .procname = "addr_gen_mode",
6978 .data = &ipv6_devconf.addr_gen_mode,
6979 .maxlen = sizeof(int),
6980 .mode = 0644,
d35a00b8
FJ		 6981 .proc_handler = addrconf_sysctl_addr_gen_mode,
6982 },
df789fe7
DF		 6983 {
6984 .procname = "disable_policy",
6985 .data = &ipv6_devconf.disable_policy,
6986 .maxlen = sizeof(int),
6987 .mode = 0644,
6988 .proc_handler = addrconf_sysctl_disable_policy,
6989 },
2210d6b2
MŻ		 6990 {
6991 .procname = "ndisc_tclass",
6992 .data = &ipv6_devconf.ndisc_tclass,
6993 .maxlen = sizeof(int),
6994 .mode = 0644,
6995 .proc_handler = proc_dointvec_minmax,
eec4844f 6996 .extra1 = (void *)SYSCTL_ZERO,
2210d6b2
MŻ		 6997 .extra2 = (void *)&two_five_five,
6998 },
8610c7c6
AA		 6999 {
7000 .procname = "rpl_seg_enabled",
7001 .data = &ipv6_devconf.rpl_seg_enabled,
7002 .maxlen = sizeof(int),
7003 .mode = 0644,
7004 .proc_handler = proc_dointvec,
7005 },
9ee11f0f
JI		 7006 {
7007 .procname = "ioam6_enabled",
7008 .data = &ipv6_devconf.ioam6_enabled,
7009 .maxlen = sizeof(u8),
7010 .mode = 0644,
7011 .proc_handler = proc_dou8vec_minmax,
7012 .extra1 = (void *)SYSCTL_ZERO,
7013 .extra2 = (void *)SYSCTL_ONE,
7014 },
7015 {
7016 .procname = "ioam6_id",
7017 .data = &ipv6_devconf.ioam6_id,
7018 .maxlen = sizeof(u32),
7019 .mode = 0644,
7020 .proc_handler = proc_douintvec_minmax,
7021 .extra1 = (void *)SYSCTL_ZERO,
7022 .extra2 = (void *)&ioam6_if_id_max,
7023 },
7024 {
7025 .procname = "ioam6_id_wide",
7026 .data = &ipv6_devconf.ioam6_id_wide,
7027 .maxlen = sizeof(u32),
7028 .mode = 0644,
7029 .proc_handler = proc_douintvec,
7030 },
18ac597a
JP		 7031 {
7032 .procname = "ndisc_evict_nocarrier",
7033 .data = &ipv6_devconf.ndisc_evict_nocarrier,
7034 .maxlen = sizeof(u8),
7035 .mode = 0644,
7036 .proc_handler = proc_dou8vec_minmax,
7037 .extra1 = (void *)SYSCTL_ZERO,
7038 .extra2 = (void *)SYSCTL_ONE,
7039 },
f9a2fb73 7040 {
3e0b8f52
AA		 7041 .procname = "accept_untracked_na",
7042 .data = &ipv6_devconf.accept_untracked_na,
f9a2fb73
AA		 7043 .maxlen = sizeof(int),
7044 .mode = 0644,
d09d3ec0 7045 .proc_handler = proc_dointvec_minmax,
f9a2fb73
AA		 7046 .extra1 = (void *)SYSCTL_ZERO,
7047 .extra2 = (void *)SYSCTL_ONE,
7048 },
5df1f77f
KK		 7049 {
7050 /* sentinel */
7051 }
1da177e4
LT		 7052};
7053
bff16c2f 7054static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 7055 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4 7056{
29c994e3 7057 int i, ifindex;
607ea7cd 7058 struct ctl_table *table;
6105e293 7059 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 7060
425b9c7f 7061 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT);
607ea7cd 7062 if (!table)
f68635e6
PE		 7063 goto out;
7064
607ea7cd
KK		 7065 for (i = 0; table[i].data; i++) {
7066 table[i].data += (char *)p - (char *)&ipv6_devconf;
cb9e684e
MŻ		 7067 /* If one of these is already set, then it is not safe to
7068 * overwrite either of them: this makes proc_dointvec_minmax
7069 * usable.
7070 */
7071 if (!table[i].extra1 && !table[i].extra2) {
7072 table[i].extra1 = idev; /* embedded; no ref */
7073 table[i].extra2 = net;
7074 }
1da177e4 7075 }
1da177e4 7076
6105e293 7077 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 7078
607ea7cd
KK		 7079 p->sysctl_header = register_net_sysctl(net, path, table);
7080 if (!p->sysctl_header)
6105e293 7081 goto free;
f68635e6 7082
29c994e3
ND		 7083 if (!strcmp(dev_name, "all"))
7084 ifindex = NETCONFA_IFINDEX_ALL;
7085 else if (!strcmp(dev_name, "default"))
7086 ifindex = NETCONFA_IFINDEX_DEFAULT;
7087 else
7088 ifindex = idev->dev->ifindex;
85b3daad
DA		 7089 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
7090 ifindex, p);
95897312 7091 return 0;
1da177e4 7092
f68635e6 7093free:
607ea7cd 7094 kfree(table);
f68635e6 7095out:
95897312 7096 return -ENOBUFS;
1da177e4
LT		 7097}
7098
23452170
DA		 7099static void __addrconf_sysctl_unregister(struct net *net,
7100 struct ipv6_devconf *p, int ifindex)
408c4768 7101{
607ea7cd 7102 struct ctl_table *table;
408c4768 7103
607ea7cd 7104 if (!p->sysctl_header)
408c4768
PE		 7105 return;
7106
607ea7cd
KK		 7107 table = p->sysctl_header->ctl_table_arg;
7108 unregister_net_sysctl_table(p->sysctl_header);
7109 p->sysctl_header = NULL;
7110 kfree(table);
23452170
DA		 7111
7112 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
408c4768
PE		 7113}
7114
a317a2f1 7115static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 7116{
a317a2f1
WC		 7117 int err;
7118
7119 if (!sysctl_dev_name_is_allowed(idev->dev->name))
7120 return -EINVAL;
7121
7122 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
7123 &ndisc_ifinfo_sysctl_change);
7124 if (err)
7125 return err;
7126 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
7127 idev, &idev->cnf);
7128 if (err)
7129 neigh_sysctl_unregister(idev->nd_parms);
7130
7131 return err;
f52295a9
PE		 7132}
7133
408c4768 7134static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 7135{
23452170
DA		 7136 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
7137 idev->dev->ifindex);
408c4768 7138 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 7139}
7140
7141
7142#endif
7143
2c8c1e72 7144static int __net_init addrconf_init_net(struct net *net)
e0da5a48 7145{
a79ca223 7146 int err = -ENOMEM;
e0da5a48
PE		 7147 struct ipv6_devconf *all, *dflt;
7148
21a216a8 7149 spin_lock_init(&net->ipv6.addrconf_hash_lock);
8805d13f 7150 INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work);
21a216a8
ED		 7151 net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE,
7152 sizeof(struct hlist_head),
7153 GFP_KERNEL);
7154 if (!net->ipv6.inet6_addr_lst)
7155 goto err_alloc_addr;
7156
a79ca223 7157 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 7158 if (!all)
a79ca223 7159 goto err_alloc_all;
e0da5a48 7160
a79ca223 7161 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 7162 if (!dflt)
a79ca223 7163 goto err_alloc_dflt;
e0da5a48 7164
a154d5d8 7165 if (IS_ENABLED(CONFIG_SYSCTL) &&
9efd6a3c
ND		 7166 !net_eq(net, &init_net)) {
7167 switch (sysctl_devconf_inherit_init_net) {
7168 case 1: /* copy from init_net */
7169 memcpy(all, init_net.ipv6.devconf_all,
7170 sizeof(ipv6_devconf));
7171 memcpy(dflt, init_net.ipv6.devconf_dflt,
7172 sizeof(ipv6_devconf_dflt));
7173 break;
7174 case 3: /* copy from the current netns */
7175 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all,
7176 sizeof(ipv6_devconf));
7177 memcpy(dflt,
7178 current->nsproxy->net_ns->ipv6.devconf_dflt,
7179 sizeof(ipv6_devconf_dflt));
7180 break;
7181 case 0:
7182 case 2:
7183 /* use compiled values */
7184 break;
7185 }
856c395c
CW		 7186 }
7187
a79ca223
HZ		 7188 /* these will be inherited by all namespaces */
7189 dflt->autoconf = ipv6_defaults.autoconf;
7190 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 7191
3d1bec99
HFS		 7192 dflt->stable_secret.initialized = false;
7193 all->stable_secret.initialized = false;
7194
e0da5a48
PE		 7195 net->ipv6.devconf_all = all;
7196 net->ipv6.devconf_dflt = dflt;
7197
7198#ifdef CONFIG_SYSCTL
f8572d8f 7199 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 7200 if (err < 0)
7201 goto err_reg_all;
7202
f8572d8f 7203 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 7204 if (err < 0)
7205 goto err_reg_dflt;
7206#endif
7207 return 0;
7208
7209#ifdef CONFIG_SYSCTL
7210err_reg_dflt:
23452170 7211 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
e0da5a48
PE		 7212err_reg_all:
7213 kfree(dflt);
7214#endif
7215err_alloc_dflt:
7216 kfree(all);
7217err_alloc_all:
21a216a8
ED		 7218 kfree(net->ipv6.inet6_addr_lst);
7219err_alloc_addr:
e0da5a48
PE		 7220 return err;
7221}
7222
2c8c1e72 7223static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48 7224{
21a216a8
ED		 7225 int i;
7226
e0da5a48 7227#ifdef CONFIG_SYSCTL
23452170
DA		 7228 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7229 NETCONFA_IFINDEX_DEFAULT);
7230 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7231 NETCONFA_IFINDEX_ALL);
e0da5a48 7232#endif
73cf0e92 7233 kfree(net->ipv6.devconf_dflt);
7d9b1b57 7234 net->ipv6.devconf_dflt = NULL;
73cf0e92 7235 kfree(net->ipv6.devconf_all);
7d9b1b57 7236 net->ipv6.devconf_all = NULL;
21a216a8 7237
be6b41c1 7238 cancel_delayed_work_sync(&net->ipv6.addr_chk_work);
21a216a8
ED		 7239 /*
7240 * Check hash table, then free it.
7241 */
7242 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7243 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i]));
7244
7245 kfree(net->ipv6.inet6_addr_lst);
7246 net->ipv6.inet6_addr_lst = NULL;
e0da5a48
PE		 7247}
7248
7249static struct pernet_operations addrconf_ops = {
7250 .init = addrconf_init_net,
7251 .exit = addrconf_exit_net,
7252};
7253
207895fd 7254static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 7255 .family = AF_INET6,
7256 .fill_link_af = inet6_fill_link_af,
7257 .get_link_af_size = inet6_get_link_af_size,
11b1f828 7258 .validate_link_af = inet6_validate_link_af,
f53adae4 7259 .set_link_af = inet6_set_link_af,
b382b191
TG		 7260};
7261
1da177e4
LT		 7262/*
7263 * Init / cleanup code
7264 */
7265
7266int __init addrconf_init(void)
7267{
a317a2f1 7268 struct inet6_dev *idev;
e66d1172 7269 int err;
2a8cc6c8 7270
e21e8467
SH		 7271 err = ipv6_addr_label_init();
7272 if (err < 0) {
f3213831
JP		 7273 pr_crit("%s: cannot initialize default policy table: %d\n",
7274 __func__, err);
2cc6d2bf 7275 goto out;
2a8cc6c8 7276 }
1da177e4 7277
2cc6d2bf
NH		 7278 err = register_pernet_subsys(&addrconf_ops);
7279 if (err < 0)
7280 goto out_addrlabel;
e0da5a48 7281
c15b1cca
HFS		 7282 addrconf_wq = create_workqueue("ipv6_addrconf");
7283 if (!addrconf_wq) {
7284 err = -ENOMEM;
7285 goto out_nowq;
7286 }
7287
1da177e4 7288 rtnl_lock();
e5f80fcf 7289 idev = ipv6_add_dev(blackhole_netdev);
1da177e4 7290 rtnl_unlock();
a317a2f1
WC		 7291 if (IS_ERR(idev)) {
7292 err = PTR_ERR(idev);
e0da5a48 7293 goto errlo;
a317a2f1 7294 }
1da177e4 7295
2f460933
WC		 7296 ip6_route_init_special_entries();
7297
1da177e4
LT		 7298 register_netdevice_notifier(&ipv6_dev_notf);
7299
8805d13f 7300 addrconf_verify(&init_net);
c127ea2c 7301
3678a9d8 7302 rtnl_af_register(&inet6_ops);
b382b191 7303
16feebcf
FW		 7304 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7305 NULL, inet6_dump_ifinfo, 0);
c127ea2c
TG		 7306 if (err < 0)
7307 goto errout;
7308
16feebcf
FW		 7309 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7310 inet6_rtm_newaddr, NULL, 0);
7311 if (err < 0)
7312 goto errout;
7313 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7314 inet6_rtm_deladdr, NULL, 0);
7315 if (err < 0)
7316 goto errout;
7317 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7318 inet6_rtm_getaddr, inet6_dump_ifaddr,
7319 RTNL_FLAG_DOIT_UNLOCKED);
7320 if (err < 0)
7321 goto errout;
7322 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7323 NULL, inet6_dump_ifmcaddr, 0);
7324 if (err < 0)
7325 goto errout;
7326 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7327 NULL, inet6_dump_ifacaddr, 0);
7328 if (err < 0)
7329 goto errout;
7330 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7331 inet6_netconf_get_devconf,
7332 inet6_netconf_dump_devconf,
7333 RTNL_FLAG_DOIT_UNLOCKED);
7334 if (err < 0)
7335 goto errout;
a3fde2ad
FW		 7336 err = ipv6_addr_label_rtnl_register();
7337 if (err < 0)
7338 goto errout;
2a8cc6c8 7339
1da177e4 7340 return 0;
c127ea2c 7341errout:
16feebcf 7342 rtnl_unregister_all(PF_INET6);
b382b191 7343 rtnl_af_unregister(&inet6_ops);
c127ea2c 7344 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 7345errlo:
c15b1cca
HFS		 7346 destroy_workqueue(addrconf_wq);
7347out_nowq:
e0da5a48 7348 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 7349out_addrlabel:
7350 ipv6_addr_label_cleanup();
7351out:
c127ea2c 7352 return err;
1da177e4
LT		 7353}
7354
09f7709f 7355void addrconf_cleanup(void)
1da177e4 7356{
176c39af 7357 struct net_device *dev;
1da177e4
LT		 7358
7359 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 7360 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 7361 ipv6_addr_label_cleanup();
1da177e4 7362
5c45121d 7363 rtnl_af_unregister(&inet6_ops);
1da177e4 7364
5c45121d 7365 rtnl_lock();
b382b191 7366
176c39af
DL		 7367 /* clean dev list */
7368 for_each_netdev(&init_net, dev) {
7369 if (__in6_dev_get(dev) == NULL)
7370 continue;
ae79dbf6 7371 addrconf_ifdown(dev, true);
176c39af 7372 }
ae79dbf6 7373 addrconf_ifdown(init_net.loopback_dev, true);
176c39af 7374
1da177e4 7375 rtnl_unlock();
c15b1cca
HFS		 7376
7377 destroy_workqueue(addrconf_wq);
1da177e4 7378}
Michael's Linux tree.