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Merge tag '9p-fixes-6.5-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh...
[linux-block.git] / net / ipv6 / addrconf.c
CommitLineData
2874c5fd 1// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4
LT		 2/*
3 * IPv6 Address [auto]configuration
4 * Linux INET6 implementation
5 *
6 * Authors:
1ab1457c 7 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4 8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
1da177e4
LT		 9 */
10
11/*
12 * Changes:
13 *
14 * Janos Farkas : delete timer on ifdown
15 * <chexum@bankinf.banki.hu>
16 * Andi Kleen : kill double kfree on module
17 * unload.
18 * Maciej W. Rozycki : FDDI support
19 * sekiya@USAGI : Don't send too many RS
20 * packets.
21 * yoshfuji@USAGI : Fixed interval between DAD
22 * packets.
23 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
24 * address validation timer.
25 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
26 * support.
27 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
28 * address on a same interface.
29 * YOSHIFUJI Hideaki @USAGI : ARCnet support
30 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
31 * seq_file.
b1cacb68
YH		 32 * YOSHIFUJI Hideaki @USAGI : improved source address
33 * selection; consider scope,
34 * status etc.
1da177e4
LT		 35 */
36
f3213831
JP		 37#define pr_fmt(fmt) "IPv6: " fmt
38
1da177e4
LT		 39#include <linux/errno.h>
40#include <linux/types.h>
a0bffffc 41#include <linux/kernel.h>
174cd4b1 42#include <linux/sched/signal.h>
1da177e4
LT		 43#include <linux/socket.h>
44#include <linux/sockios.h>
1da177e4 45#include <linux/net.h>
3d1bec99 46#include <linux/inet.h>
1da177e4
LT		 47#include <linux/in6.h>
48#include <linux/netdevice.h>
1823730f 49#include <linux/if_addr.h>
1da177e4
LT		 50#include <linux/if_arp.h>
51#include <linux/if_arcnet.h>
52#include <linux/if_infiniband.h>
53#include <linux/route.h>
54#include <linux/inetdevice.h>
55#include <linux/init.h>
5a0e3ad6 56#include <linux/slab.h>
1da177e4
LT		 57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
4fc268d2 60#include <linux/capability.h>
1da177e4
LT		 61#include <linux/delay.h>
62#include <linux/notifier.h>
543537bd 63#include <linux/string.h>
ddbe5032 64#include <linux/hash.h>
1da177e4 65
457c4cbc 66#include <net/net_namespace.h>
1da177e4
LT		 67#include <net/sock.h>
68#include <net/snmp.h>
69
5241c2d7 70#include <net/6lowpan.h>
cb6bf355 71#include <net/firewire.h>
1da177e4
LT		 72#include <net/ipv6.h>
73#include <net/protocol.h>
74#include <net/ndisc.h>
75#include <net/ip6_route.h>
76#include <net/addrconf.h>
77#include <net/tcp.h>
78#include <net/ip.h>
5d620266 79#include <net/netlink.h>
f24e3d65 80#include <net/pkt_sched.h>
ca254490 81#include <net/l3mdev.h>
1da177e4
LT		 82#include <linux/if_tunnel.h>
83#include <linux/rtnetlink.h>
f3a1bfb1 84#include <linux/netconf.h>
1da177e4 85#include <linux/random.h>
e21e8467 86#include <linux/uaccess.h>
7f7d9a6b 87#include <asm/unaligned.h>
1da177e4
LT		 88
89#include <linux/proc_fs.h>
90#include <linux/seq_file.h>
bc3b2d7f 91#include <linux/export.h>
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 */
e8a533cb 107 u64 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)irt;
bd11f074
MŻ		 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 */
e8a533cb 115 u64 tmp = get_random_u32_inclusive(1900000, 2100000) * (u64)rt;
bd11f074
MŻ		 116 do_div(tmp, 1000000);
117 if ((s32)tmp > mrt) {
118 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
e8a533cb 119 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)mrt;
bd11f074
MŻ		 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{
06a07169 321 if (!mod_timer(&idev->rs_timer, jiffies + when))
b7b1bfce 322 in6_dev_hold(idev);
b7b1bfce 323}
1da177e4 324
c15b1cca
HFS		 325static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
326 unsigned long delay)
1da177e4 327{
f8a894b2
XL		 328 in6_ifa_hold(ifp);
329 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
330 in6_ifa_put(ifp);
1da177e4
LT		 331}
332
7f7d9a6b
HX		 333static int snmp6_alloc_dev(struct inet6_dev *idev)
334{
827da44c
JS		 335 int i;
336
425b9c7f 337 idev->stats.ipv6 = alloc_percpu_gfp(struct ipstats_mib, GFP_KERNEL_ACCOUNT);
698365fa 338 if (!idev->stats.ipv6)
7f7d9a6b 339 goto err_ip;
827da44c
JS		 340
341 for_each_possible_cpu(i) {
342 struct ipstats_mib *addrconf_stats;
698365fa 343 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 344 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 345 }
346
347
be281e55
ED		 348 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
349 GFP_KERNEL);
350 if (!idev->stats.icmpv6dev)
7f7d9a6b 351 goto err_icmp;
be281e55 352 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
425b9c7f 353 GFP_KERNEL_ACCOUNT);
be281e55 354 if (!idev->stats.icmpv6msgdev)
14878f75 355 goto err_icmpmsg;
7f7d9a6b
HX		 356
357 return 0;
358
14878f75 359err_icmpmsg:
be281e55 360 kfree(idev->stats.icmpv6dev);
7f7d9a6b 361err_icmp:
698365fa 362 free_percpu(idev->stats.ipv6);
7f7d9a6b 363err_ip:
aaf70ec7 364 return -ENOMEM;
7f7d9a6b
HX		 365}
366
8e5e8f30 367static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 368{
369 struct inet6_dev *ndev;
a317a2f1 370 int err = -ENOMEM;
1da177e4
LT		 371
372 ASSERT_RTNL();
373
e5f80fcf 374 if (dev->mtu < IPV6_MIN_MTU && dev != blackhole_netdev)
a317a2f1 375 return ERR_PTR(-EINVAL);
1da177e4 376
425b9c7f 377 ndev = kzalloc(sizeof(*ndev), GFP_KERNEL_ACCOUNT);
63159f29 378 if (!ndev)
a317a2f1 379 return ERR_PTR(err);
322f74a4
IO		 380
381 rwlock_init(&ndev->lock);
382 ndev->dev = dev;
502a2ffd 383 INIT_LIST_HEAD(&ndev->addr_list);
e99e88a9 384 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
c346dca1 385 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
9b29c696
HFS		 386
387 if (ndev->cnf.stable_secret.initialized)
d35a00b8 388 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
9b29c696 389
322f74a4 390 ndev->cnf.mtu6 = dev->mtu;
49b99da2 391 ndev->ra_mtu = 0;
322f74a4 392 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
63159f29 393 if (!ndev->nd_parms) {
322f74a4 394 kfree(ndev);
a317a2f1 395 return ERR_PTR(err);
322f74a4 396 }
0187bdfb
BH		 397 if (ndev->cnf.forwarding)
398 dev_disable_lro(dev);
322f74a4 399 /* We refer to the device */
d62607c3 400 netdev_hold(dev, &ndev->dev_tracker, GFP_KERNEL);
1da177e4 401
dd263a8c
IS		 402 if (snmp6_alloc_dev(ndev) < 0) {
403 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
404 __func__);
405 neigh_parms_release(&nd_tbl, ndev->nd_parms);
d62607c3 406 netdev_put(dev, &ndev->dev_tracker);
dd263a8c
IS		 407 kfree(ndev);
408 return ERR_PTR(err);
409 }
1da177e4 410
dd263a8c 411 if (dev != blackhole_netdev) {
e5f80fcf
ED		 412 if (snmp6_register_dev(ndev) < 0) {
413 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
414 __func__, dev->name);
415 goto err_release;
416 }
322f74a4 417 }
9d6280da 418 /* One reference from device. */
1be92460 419 refcount_set(&ndev->refcnt, 1);
1da177e4 420
1b34be74
YH		 421 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
422 ndev->cnf.accept_dad = -1;
423
07a93626 424#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 425 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 426 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 427 ndev->cnf.rtr_solicits = 0;
428 }
429#endif
430
372e6c8f 431 INIT_LIST_HEAD(&ndev->tempaddr_list);
76506a98 432 ndev->desync_factor = U32_MAX;
322f74a4
IO		 433 if ((dev->flags&IFF_LOOPBACK) ||
434 dev->type == ARPHRD_TUNNEL ||
9625ed72 435 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 436 dev->type == ARPHRD_SIT ||
0be669bb 437 dev->type == ARPHRD_NONE) {
322f74a4 438 ndev->cnf.use_tempaddr = -1;
969c5464 439 }
5d9efa7e 440
914faa14 441 ndev->token = in6addr_any;
1da177e4 442
1f372c7b 443 if (netif_running(dev) && addrconf_link_ready(dev))
53aadcc9
HX		 444 ndev->if_flags |= IF_READY;
445
322f74a4
IO		 446 ipv6_mc_init_dev(ndev);
447 ndev->tstamp = jiffies;
e5f80fcf
ED		 448 if (dev != blackhole_netdev) {
449 err = addrconf_sysctl_register(ndev);
450 if (err) {
451 ipv6_mc_destroy_dev(ndev);
452 snmp6_unregister_dev(ndev);
453 goto err_release;
454 }
a317a2f1 455 }
30c4cf57 456 /* protected by rtnl_lock */
cf778b00 457 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 458
e5f80fcf
ED		 459 if (dev != blackhole_netdev) {
460 /* Join interface-local all-node multicast group */
461 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
2c5e8933 462
e5f80fcf
ED		 463 /* Join all-node multicast group */
464 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d6ddef9e 465
e5f80fcf
ED		 466 /* Join all-router multicast group if forwarding is set */
467 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
468 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
469 }
1da177e4 470 return ndev;
a317a2f1
WC		 471
472err_release:
473 neigh_parms_release(&nd_tbl, ndev->nd_parms);
474 ndev->dead = 1;
475 in6_dev_finish_destroy(ndev);
476 return ERR_PTR(err);
1da177e4
LT		 477}
478
8e5e8f30 479static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 480{
481 struct inet6_dev *idev;
482
483 ASSERT_RTNL();
484
e21e8467
SH		 485 idev = __in6_dev_get(dev);
486 if (!idev) {
487 idev = ipv6_add_dev(dev);
a317a2f1 488 if (IS_ERR(idev))
db0b99f5 489 return idev;
1da177e4 490 }
c5e33bdd 491
1da177e4
LT		 492 if (dev->flags&IFF_UP)
493 ipv6_mc_up(idev);
494 return idev;
495}
496
f3a1bfb1
ND		 497static int inet6_netconf_msgsize_devconf(int type)
498{
499 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
500 + nla_total_size(4); /* NETCONFA_IFINDEX */
136ba622 501 bool all = false;
f3a1bfb1 502
136ba622
ZS		 503 if (type == NETCONFA_ALL)
504 all = true;
505
506 if (all || type == NETCONFA_FORWARDING)
f3a1bfb1 507 size += nla_total_size(4);
b1afce95 508#ifdef CONFIG_IPV6_MROUTE
136ba622 509 if (all || type == NETCONFA_MC_FORWARDING)
d67b8c61 510 size += nla_total_size(4);
b1afce95 511#endif
136ba622 512 if (all || type == NETCONFA_PROXY_NEIGH)
c92d5491 513 size += nla_total_size(4);
f3a1bfb1 514
136ba622 515 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
35103d11
AG		 516 size += nla_total_size(4);
517
f3a1bfb1
ND		 518 return size;
519}
520
521static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
522 struct ipv6_devconf *devconf, u32 portid,
523 u32 seq, int event, unsigned int flags,
524 int type)
525{
526 struct nlmsghdr *nlh;
527 struct netconfmsg *ncm;
136ba622 528 bool all = false;
f3a1bfb1
ND		 529
530 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
531 flags);
63159f29 532 if (!nlh)
f3a1bfb1
ND		 533 return -EMSGSIZE;
534
136ba622
ZS		 535 if (type == NETCONFA_ALL)
536 all = true;
537
f3a1bfb1
ND		 538 ncm = nlmsg_data(nlh);
539 ncm->ncm_family = AF_INET6;
540
541 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
542 goto nla_put_failure;
543
23452170
DA		 544 if (!devconf)
545 goto out;
546
136ba622 547 if ((all || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 548 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
549 goto nla_put_failure;
b1afce95 550#ifdef CONFIG_IPV6_MROUTE
136ba622 551 if ((all || type == NETCONFA_MC_FORWARDING) &&
d67b8c61 552 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
145c7a79 553 atomic_read(&devconf->mc_forwarding)) < 0)
d67b8c61 554 goto nla_put_failure;
b1afce95 555#endif
136ba622 556 if ((all || type == NETCONFA_PROXY_NEIGH) &&
c92d5491 557 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
558 goto nla_put_failure;
559
136ba622 560 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
35103d11
AG		 561 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
562 devconf->ignore_routes_with_linkdown) < 0)
563 goto nla_put_failure;
564
23452170 565out:
053c095a
JB		 566 nlmsg_end(skb, nlh);
567 return 0;
f3a1bfb1
ND		 568
569nla_put_failure:
570 nlmsg_cancel(skb, nlh);
571 return -EMSGSIZE;
572}
573
85b3daad
DA		 574void inet6_netconf_notify_devconf(struct net *net, int event, int type,
575 int ifindex, struct ipv6_devconf *devconf)
f3a1bfb1
ND		 576{
577 struct sk_buff *skb;
578 int err = -ENOBUFS;
579
927265bc 580 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
63159f29 581 if (!skb)
f3a1bfb1
ND		 582 goto errout;
583
584 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
85b3daad 585 event, 0, type);
f3a1bfb1
ND		 586 if (err < 0) {
587 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
588 WARN_ON(err == -EMSGSIZE);
589 kfree_skb(skb);
590 goto errout;
591 }
927265bc 592 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
f3a1bfb1
ND		 593 return;
594errout:
bd779028 595 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 596}
597
76f8f6cb
ND		 598static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
599 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
600 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 601 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
35103d11 602 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
76f8f6cb
ND		 603};
604
38d51810
JK		 605static int inet6_netconf_valid_get_req(struct sk_buff *skb,
606 const struct nlmsghdr *nlh,
607 struct nlattr **tb,
608 struct netlink_ext_ack *extack)
609{
610 int i, err;
611
612 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
613 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
614 return -EINVAL;
615 }
616
617 if (!netlink_strict_get_check(skb))
8cb08174
JB		 618 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
619 tb, NETCONFA_MAX,
620 devconf_ipv6_policy, extack);
38d51810 621
8cb08174
JB		 622 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
623 tb, NETCONFA_MAX,
624 devconf_ipv6_policy, extack);
38d51810
JK		 625 if (err)
626 return err;
627
628 for (i = 0; i <= NETCONFA_MAX; i++) {
629 if (!tb[i])
630 continue;
631
632 switch (i) {
633 case NETCONFA_IFINDEX:
634 break;
635 default:
636 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
637 return -EINVAL;
638 }
639 }
640
641 return 0;
642}
643
76f8f6cb 644static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
c21ef3e3
DA		 645 struct nlmsghdr *nlh,
646 struct netlink_ext_ack *extack)
76f8f6cb
ND		 647{
648 struct net *net = sock_net(in_skb->sk);
649 struct nlattr *tb[NETCONFA_MAX+1];
4ea2607f
FW		 650 struct inet6_dev *in6_dev = NULL;
651 struct net_device *dev = NULL;
76f8f6cb
ND		 652 struct sk_buff *skb;
653 struct ipv6_devconf *devconf;
76f8f6cb
ND		 654 int ifindex;
655 int err;
656
38d51810 657 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
76f8f6cb 658 if (err < 0)
4ea2607f 659 return err;
76f8f6cb 660
76f8f6cb 661 if (!tb[NETCONFA_IFINDEX])
4ea2607f 662 return -EINVAL;
76f8f6cb 663
4ea2607f 664 err = -EINVAL;
76f8f6cb
ND		 665 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
666 switch (ifindex) {
667 case NETCONFA_IFINDEX_ALL:
668 devconf = net->ipv6.devconf_all;
669 break;
670 case NETCONFA_IFINDEX_DEFAULT:
671 devconf = net->ipv6.devconf_dflt;
672 break;
673 default:
4ea2607f 674 dev = dev_get_by_index(net, ifindex);
63159f29 675 if (!dev)
4ea2607f
FW		 676 return -EINVAL;
677 in6_dev = in6_dev_get(dev);
63159f29 678 if (!in6_dev)
76f8f6cb
ND		 679 goto errout;
680 devconf = &in6_dev->cnf;
681 break;
682 }
683
684 err = -ENOBUFS;
4ea2607f 685 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
63159f29 686 if (!skb)
76f8f6cb
ND		 687 goto errout;
688
689 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
690 NETLINK_CB(in_skb).portid,
691 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
136ba622 692 NETCONFA_ALL);
76f8f6cb
ND		 693 if (err < 0) {
694 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
695 WARN_ON(err == -EMSGSIZE);
696 kfree_skb(skb);
697 goto errout;
698 }
699 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
700errout:
4ea2607f
FW		 701 if (in6_dev)
702 in6_dev_put(in6_dev);
1160dfa1 703 dev_put(dev);
76f8f6cb
ND		 704 return err;
705}
706
7a674200
ND		 707static int inet6_netconf_dump_devconf(struct sk_buff *skb,
708 struct netlink_callback *cb)
709{
addd383f 710 const struct nlmsghdr *nlh = cb->nlh;
7a674200
ND		 711 struct net *net = sock_net(skb->sk);
712 int h, s_h;
713 int idx, s_idx;
714 struct net_device *dev;
715 struct inet6_dev *idev;
716 struct hlist_head *head;
717
addd383f
DA		 718 if (cb->strict_check) {
719 struct netlink_ext_ack *extack = cb->extack;
720 struct netconfmsg *ncm;
721
722 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
723 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
724 return -EINVAL;
725 }
726
727 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
728 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
729 return -EINVAL;
730 }
731 }
732
7a674200
ND		 733 s_h = cb->args[0];
734 s_idx = idx = cb->args[1];
735
736 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
737 idx = 0;
738 head = &net->dev_index_head[h];
739 rcu_read_lock();
63998ac2
ND		 740 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
741 net->dev_base_seq;
7a674200
ND		 742 hlist_for_each_entry_rcu(dev, head, index_hlist) {
743 if (idx < s_idx)
744 goto cont;
745 idev = __in6_dev_get(dev);
746 if (!idev)
747 goto cont;
748
749 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
750 &idev->cnf,
751 NETLINK_CB(cb->skb).portid,
addd383f 752 nlh->nlmsg_seq,
7a674200
ND		 753 RTM_NEWNETCONF,
754 NLM_F_MULTI,
136ba622 755 NETCONFA_ALL) < 0) {
7a674200
ND		 756 rcu_read_unlock();
757 goto done;
758 }
63998ac2 759 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 760cont:
761 idx++;
762 }
763 rcu_read_unlock();
764 }
765 if (h == NETDEV_HASHENTRIES) {
766 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
767 net->ipv6.devconf_all,
768 NETLINK_CB(cb->skb).portid,
addd383f 769 nlh->nlmsg_seq,
7a674200 770 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 771 NETCONFA_ALL) < 0)
7a674200
ND		 772 goto done;
773 else
774 h++;
775 }
776 if (h == NETDEV_HASHENTRIES + 1) {
777 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
778 net->ipv6.devconf_dflt,
779 NETLINK_CB(cb->skb).portid,
addd383f 780 nlh->nlmsg_seq,
7a674200 781 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 782 NETCONFA_ALL) < 0)
7a674200
ND		 783 goto done;
784 else
785 h++;
786 }
787done:
788 cb->args[0] = h;
789 cb->args[1] = idx;
790
791 return skb->len;
792}
793
1da177e4
LT		 794#ifdef CONFIG_SYSCTL
795static void dev_forward_change(struct inet6_dev *idev)
796{
797 struct net_device *dev;
798 struct inet6_ifaddr *ifa;
51454ea4 799 LIST_HEAD(tmp_addr_list);
1da177e4
LT		 800
801 if (!idev)
802 return;
803 dev = idev->dev;
0187bdfb
BH		 804 if (idev->cnf.forwarding)
805 dev_disable_lro(dev);
1a940835 806 if (dev->flags & IFF_MULTICAST) {
2c5e8933 807 if (idev->cnf.forwarding) {
f3ee4010 808 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 809 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
810 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
811 } else {
f3ee4010 812 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 813 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
814 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
815 }
1da177e4 816 }
502a2ffd 817
51454ea4 818 read_lock_bh(&idev->lock);
502a2ffd 819 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 820 if (ifa->flags&IFA_F_TENTATIVE)
821 continue;
51454ea4
ND		 822 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
823 }
824 read_unlock_bh(&idev->lock);
825
826 while (!list_empty(&tmp_addr_list)) {
827 ifa = list_first_entry(&tmp_addr_list,
828 struct inet6_ifaddr, if_list_aux);
829 list_del(&ifa->if_list_aux);
1da177e4
LT		 830 if (idev->cnf.forwarding)
831 addrconf_join_anycast(ifa);
832 else
833 addrconf_leave_anycast(ifa);
834 }
51454ea4 835
85b3daad
DA		 836 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
837 NETCONFA_FORWARDING,
f3a1bfb1 838 dev->ifindex, &idev->cnf);
1da177e4
LT		 839}
840
841
e186932b 842static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 843{
844 struct net_device *dev;
845 struct inet6_dev *idev;
846
4acd4945 847 for_each_netdev(net, dev) {
1da177e4
LT		 848 idev = __in6_dev_get(dev);
849 if (idev) {
e186932b
PE		 850 int changed = (!idev->cnf.forwarding) ^ (!newf);
851 idev->cnf.forwarding = newf;
1da177e4
LT		 852 if (changed)
853 dev_forward_change(idev);
854 }
1da177e4 855 }
1da177e4 856}
c8fecf22 857
013d97e9 858static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 859{
bff16c2f 860 struct net *net;
013d97e9
FR		 861 int old;
862
863 if (!rtnl_trylock())
864 return restart_syscall();
bff16c2f
PE		 865
866 net = (struct net *)table->extra2;
013d97e9
FR		 867 old = *p;
868 *p = newf;
b325fddb 869
013d97e9 870 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1 871 if ((!newf) ^ (!old))
85b3daad
DA		 872 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
873 NETCONFA_FORWARDING,
f3a1bfb1
ND		 874 NETCONFA_IFINDEX_DEFAULT,
875 net->ipv6.devconf_dflt);
013d97e9
FR		 876 rtnl_unlock();
877 return 0;
88af182e 878 }
c8fecf22 879
e186932b 880 if (p == &net->ipv6.devconf_all->forwarding) {
d26c638c
ND		 881 int old_dflt = net->ipv6.devconf_dflt->forwarding;
882
e186932b 883 net->ipv6.devconf_dflt->forwarding = newf;
d26c638c 884 if ((!newf) ^ (!old_dflt))
85b3daad
DA		 885 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
886 NETCONFA_FORWARDING,
d26c638c
ND		 887 NETCONFA_IFINDEX_DEFAULT,
888 net->ipv6.devconf_dflt);
889
e186932b 890 addrconf_forward_change(net, newf);
f3a1bfb1 891 if ((!newf) ^ (!old))
85b3daad
DA		 892 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
893 NETCONFA_FORWARDING,
f3a1bfb1
ND		 894 NETCONFA_IFINDEX_ALL,
895 net->ipv6.devconf_all);
013d97e9 896 } else if ((!newf) ^ (!old))
c8fecf22 897 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 898 rtnl_unlock();
c8fecf22 899
013d97e9 900 if (newf)
7b4da532 901 rt6_purge_dflt_routers(net);
b325fddb 902 return 1;
c8fecf22 903}
35103d11
AG		 904
905static void addrconf_linkdown_change(struct net *net, __s32 newf)
906{
907 struct net_device *dev;
908 struct inet6_dev *idev;
909
910 for_each_netdev(net, dev) {
911 idev = __in6_dev_get(dev);
912 if (idev) {
913 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
914
915 idev->cnf.ignore_routes_with_linkdown = newf;
916 if (changed)
917 inet6_netconf_notify_devconf(dev_net(dev),
85b3daad 918 RTM_NEWNETCONF,
35103d11
AG		 919 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
920 dev->ifindex,
921 &idev->cnf);
922 }
923 }
924}
925
926static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
927{
928 struct net *net;
929 int old;
930
931 if (!rtnl_trylock())
932 return restart_syscall();
933
934 net = (struct net *)table->extra2;
935 old = *p;
936 *p = newf;
937
938 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
939 if ((!newf) ^ (!old))
940 inet6_netconf_notify_devconf(net,
85b3daad 941 RTM_NEWNETCONF,
35103d11
AG		 942 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
943 NETCONFA_IFINDEX_DEFAULT,
944 net->ipv6.devconf_dflt);
945 rtnl_unlock();
946 return 0;
947 }
948
949 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
950 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
951 addrconf_linkdown_change(net, newf);
952 if ((!newf) ^ (!old))
953 inet6_netconf_notify_devconf(net,
85b3daad 954 RTM_NEWNETCONF,
35103d11
AG		 955 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
956 NETCONFA_IFINDEX_ALL,
957 net->ipv6.devconf_all);
958 }
959 rtnl_unlock();
960
961 return 1;
962}
963
1da177e4
LT		 964#endif
965
5c578aed 966/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 967void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
968{
c2e21293 969 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 970
1da177e4 971#ifdef NET_REFCNT_DEBUG
91df42be 972 pr_debug("%s\n", __func__);
1da177e4
LT		 973#endif
974
975 in6_dev_put(ifp->idev);
976
c15b1cca
HFS		 977 if (cancel_delayed_work(&ifp->dad_work))
978 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
979 ifp);
1da177e4 980
e9d3e084 981 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 982 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 983 return;
984 }
1da177e4 985
e5785985 986 kfree_rcu(ifp, rcu);
1da177e4
LT		 987}
988
e55ffac6
BH		 989static void
990ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
991{
502a2ffd 992 struct list_head *p;
8a6ce0c0 993 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 994
995 /*
996 * Each device address list is sorted in order of scope -
997 * global before linklocal.
998 */
502a2ffd 999 list_for_each(p, &idev->addr_list) {
1000 struct inet6_ifaddr *ifa
1001 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 1002 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 1003 break;
1004 }
1005
8ef802aa 1006 list_add_tail_rcu(&ifp->if_list, p);
e55ffac6
BH		 1007}
1008
3f27fb23 1009static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
3eb84f49 1010{
3f27fb23
ED		 1011 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
1012
1013 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 1014}
1015
56fc709b 1016static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
752a9292 1017 struct net_device *dev, unsigned int hash)
56fc709b 1018{
56fc709b
ED		 1019 struct inet6_ifaddr *ifp;
1020
e66d1172 1021 hlist_for_each_entry(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
56fc709b
ED		 1022 if (ipv6_addr_equal(&ifp->addr, addr)) {
1023 if (!dev || ifp->idev->dev == dev)
1024 return true;
1025 }
1026 }
1027 return false;
1028}
1029
f3d9832e
DA		 1030static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1031{
e66d1172
ED		 1032 struct net *net = dev_net(dev);
1033 unsigned int hash = inet6_addr_hash(net, &ifa->addr);
f3d9832e
DA		 1034 int err = 0;
1035
09eed119 1036 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
f3d9832e
DA		 1037
1038 /* Ignore adding duplicate addresses on an interface */
e66d1172 1039 if (ipv6_chk_same_addr(net, &ifa->addr, dev, hash)) {
e32ac250 1040 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
f3d9832e 1041 err = -EEXIST;
752a9292 1042 } else {
e66d1172 1043 hlist_add_head_rcu(&ifa->addr_lst, &net->ipv6.inet6_addr_lst[hash]);
f3d9832e
DA		 1044 }
1045
09eed119 1046 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
f3d9832e
DA		 1047
1048 return err;
1049}
1050
1da177e4
LT		 1051/* On success it returns ifp with increased reference count */
1052
1053static struct inet6_ifaddr *
e6464b8c 1054ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
de95e047 1055 bool can_block, struct netlink_ext_ack *extack)
1da177e4 1056{
f3d9832e 1057 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
e6464b8c 1058 int addr_type = ipv6_addr_type(cfg->pfx);
df789fe7 1059 struct net *net = dev_net(idev->dev);
1da177e4 1060 struct inet6_ifaddr *ifa = NULL;
360a9887 1061 struct fib6_info *f6i = NULL;
1da177e4 1062 int err = 0;
d68b8270
YH		 1063
1064 if (addr_type == IPV6_ADDR_ANY ||
f17f7648
HL		 1065 (addr_type & IPV6_ADDR_MULTICAST &&
1066 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) ||
d68b8270 1067 (!(idev->dev->flags & IFF_LOOPBACK) &&
3ede0bbc 1068 !netif_is_l3_master(idev->dev) &&
d68b8270
YH		 1069 addr_type & IPV6_ADDR_LOOPBACK))
1070 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 1071
1da177e4
LT		 1072 if (idev->dead) {
1073 err = -ENODEV; /*XXX*/
f3d9832e 1074 goto out;
1da177e4
LT		 1075 }
1076
56d417b1 1077 if (idev->cnf.disable_ipv6) {
9bdd8d40 1078 err = -EACCES;
f3d9832e 1079 goto out;
9bdd8d40
BH		 1080 }
1081
ff7883ea
DA		 1082 /* validator notifier needs to be blocking;
1083 * do not call in atomic context
1084 */
1085 if (can_block) {
1086 struct in6_validator_info i6vi = {
e6464b8c 1087 .i6vi_addr = *cfg->pfx,
ff7883ea 1088 .i6vi_dev = idev,
de95e047 1089 .extack = extack,
ff7883ea
DA		 1090 };
1091
1092 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1093 err = notifier_to_errno(err);
1094 if (err < 0)
1095 goto out;
1096 }
1da177e4 1097
6126891c 1098 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT);
63159f29 1099 if (!ifa) {
1da177e4
LT		 1100 err = -ENOBUFS;
1101 goto out;
1102 }
1103
e6464b8c 1104 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
360a9887
DA		 1105 if (IS_ERR(f6i)) {
1106 err = PTR_ERR(f6i);
1107 f6i = NULL;
1da177e4
LT		 1108 goto out;
1109 }
1110
bba24896
JP		 1111 neigh_parms_data_state_setall(idev->nd_parms);
1112
e6464b8c
DA		 1113 ifa->addr = *cfg->pfx;
1114 if (cfg->peer_pfx)
1115 ifa->peer_addr = *cfg->peer_pfx;
1da177e4
LT		 1116
1117 spin_lock_init(&ifa->lock);
c15b1cca 1118 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 1119 INIT_HLIST_NODE(&ifa->addr_lst);
e6464b8c
DA		 1120 ifa->scope = cfg->scope;
1121 ifa->prefix_len = cfg->plen;
8308f3ff 1122 ifa->rt_priority = cfg->rt_priority;
e6464b8c 1123 ifa->flags = cfg->ifa_flags;
47f0bd50 1124 ifa->ifa_proto = cfg->ifa_proto;
66eb9f86 1125 /* No need to add the TENTATIVE flag for addresses with NODAD */
e6464b8c 1126 if (!(cfg->ifa_flags & IFA_F_NODAD))
66eb9f86 1127 ifa->flags |= IFA_F_TENTATIVE;
e6464b8c
DA		 1128 ifa->valid_lft = cfg->valid_lft;
1129 ifa->prefered_lft = cfg->preferred_lft;
1da177e4 1130 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 1131 ifa->tokenized = false;
1da177e4 1132
360a9887 1133 ifa->rt = f6i;
57f5f544 1134
1da177e4 1135 ifa->idev = idev;
f3d9832e
DA		 1136 in6_dev_hold(idev);
1137
1da177e4 1138 /* For caller */
271201c0 1139 refcount_set(&ifa->refcnt, 1);
1da177e4 1140
09eed119 1141 rcu_read_lock();
1da177e4 1142
f3d9832e
DA		 1143 err = ipv6_add_addr_hash(idev->dev, ifa);
1144 if (err < 0) {
09eed119 1145 rcu_read_unlock();
f3d9832e
DA		 1146 goto out;
1147 }
1da177e4 1148
09eed119 1149 write_lock_bh(&idev->lock);
f3d9832e 1150
1da177e4 1151 /* Add to inet6_dev unicast addr list. */
e55ffac6 1152 ipv6_link_dev_addr(idev, ifa);
1da177e4 1153
1da177e4 1154 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 1155 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 1156 in6_ifa_hold(ifa);
1157 }
1da177e4 1158
1da177e4 1159 in6_ifa_hold(ifa);
09eed119 1160 write_unlock_bh(&idev->lock);
f3d9832e 1161
09eed119 1162 rcu_read_unlock();
1da177e4 1163
f3d9832e
DA		 1164 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1165out:
1166 if (unlikely(err < 0)) {
360a9887 1167 fib6_info_release(f6i);
93531c67 1168
f3d9832e
DA		 1169 if (ifa) {
1170 if (ifa->idev)
1171 in6_dev_put(ifa->idev);
1172 kfree(ifa);
1173 }
1da177e4
LT		 1174 ifa = ERR_PTR(err);
1175 }
1176
1177 return ifa;
1da177e4
LT		 1178}
1179
5b84efec
TH		 1180enum cleanup_prefix_rt_t {
1181 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1182 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1183 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1184};
1185
1186/*
1187 * Check, whether the prefix for ifp would still need a prefix route
1188 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1189 * constants.
1190 *
1191 * 1) we don't purge prefix if address was not permanent.
1192 * prefix is managed by its own lifetime.
1193 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1194 * 3) if there are no addresses, delete prefix.
1195 * 4) if there are still other permanent address(es),
1196 * corresponding prefix is still permanent.
1197 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1198 * don't purge the prefix, assume user space is managing it.
1199 * 6) otherwise, update prefix lifetime to the
1200 * longest valid lifetime among the corresponding
1201 * addresses on the device.
1202 * Note: subsequent RA will update lifetime.
1203 **/
1204static enum cleanup_prefix_rt_t
1205check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1206{
1207 struct inet6_ifaddr *ifa;
1208 struct inet6_dev *idev = ifp->idev;
1209 unsigned long lifetime;
1210 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1211
1212 *expires = jiffies;
1213
1214 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1215 if (ifa == ifp)
1216 continue;
e75913c9
ZL		 1217 if (ifa->prefix_len != ifp->prefix_len ||
1218 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
5b84efec
TH		 1219 ifp->prefix_len))
1220 continue;
1221 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1222 return CLEANUP_PREFIX_RT_NOP;
1223
1224 action = CLEANUP_PREFIX_RT_EXPIRE;
1225
1226 spin_lock(&ifa->lock);
1227
1228 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1229 /*
1230 * Note: Because this address is
1231 * not permanent, lifetime <
1232 * LONG_MAX / HZ here.
1233 */
1234 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1235 *expires = ifa->tstamp + lifetime * HZ;
1236 spin_unlock(&ifa->lock);
1237 }
1238
1239 return action;
1240}
1241
1242static void
d0098e4c
HL		 1243cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1244 bool del_rt, bool del_peer)
5b84efec 1245{
93c2fb25 1246 struct fib6_info *f6i;
5b84efec 1247
d0098e4c
HL		 1248 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1249 ifp->prefix_len,
2b2450ca 1250 ifp->idev->dev, 0, RTF_DEFAULT, true);
93c2fb25 1251 if (f6i) {
5b84efec 1252 if (del_rt)
11dd74b3 1253 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
5b84efec 1254 else {
93c2fb25
DA		 1255 if (!(f6i->fib6_flags & RTF_EXPIRES))
1256 fib6_set_expires(f6i, expires);
1257 fib6_info_release(f6i);
5b84efec
TH		 1258 }
1259 }
1260}
1261
1262
1da177e4
LT		 1263/* This function wants to get referenced ifp and releases it before return */
1264
1265static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1266{
5b84efec 1267 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
e66d1172 1268 struct net *net = dev_net(ifp->idev->dev);
5b84efec 1269 unsigned long expires;
e66d1172 1270 int state;
1da177e4 1271
c15b1cca
HFS		 1272 ASSERT_RTNL();
1273
8e8e676d 1274 spin_lock_bh(&ifp->lock);
4c5ff6a6 1275 state = ifp->state;
e9d3e084 1276 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1277 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1278
1279 if (state == INET6_IFADDR_STATE_DEAD)
1280 goto out;
1da177e4 1281
e66d1172 1282 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
5c578aed 1283 hlist_del_init_rcu(&ifp->addr_lst);
e66d1172 1284 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
1da177e4 1285
5b84efec 1286 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1287
1da177e4 1288 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1289 list_del(&ifp->tmp_list);
1290 if (ifp->ifpub) {
1291 in6_ifa_put(ifp->ifpub);
1292 ifp->ifpub = NULL;
1da177e4 1293 }
372e6c8f 1294 __in6_ifa_put(ifp);
1da177e4 1295 }
1da177e4 1296
5b84efec
TH		 1297 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1298 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1299
8ef802aa 1300 list_del_rcu(&ifp->if_list);
5b84efec
TH		 1301 __in6_ifa_put(ifp);
1302
1303 write_unlock_bh(&ifp->idev->lock);
1da177e4 1304
c15b1cca 1305 addrconf_del_dad_work(ifp);
b2238566 1306
1da177e4
LT		 1307 ipv6_ifa_notify(RTM_DELADDR, ifp);
1308
f88c91dd 1309 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1310
5b84efec
TH		 1311 if (action != CLEANUP_PREFIX_RT_NOP) {
1312 cleanup_prefix_route(ifp, expires,
d0098e4c 1313 action == CLEANUP_PREFIX_RT_DEL, false);
1da177e4
LT		 1314 }
1315
c3968a85
DW		 1316 /* clean up prefsrc entries */
1317 rt6_remove_prefsrc(ifp);
4c5ff6a6 1318out:
1da177e4
LT		 1319 in6_ifa_put(ifp);
1320}
1321
969c5464 1322static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
1da177e4
LT		 1323{
1324 struct inet6_dev *idev = ifp->idev;
e6464b8c 1325 unsigned long tmp_tstamp, age;
eac55bf9 1326 unsigned long regen_advance;
76f793e3 1327 unsigned long now = jiffies;
7aa8e63f 1328 s32 cnf_temp_preferred_lft;
969c5464
FG		 1329 struct inet6_ifaddr *ift;
1330 struct ifa6_config cfg;
1331 long max_desync_factor;
1332 struct in6_addr addr;
1333 int ret = 0;
1da177e4 1334
53bd6749 1335 write_lock_bh(&idev->lock);
969c5464 1336
1da177e4
LT		 1337retry:
1338 in6_dev_hold(idev);
1339 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1340 write_unlock_bh(&idev->lock);
f3213831 1341 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1342 in6_dev_put(idev);
1343 ret = -1;
1344 goto out;
1345 }
1346 spin_lock_bh(&ifp->lock);
1347 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1348 idev->cnf.use_tempaddr = -1; /*XXX*/
1349 spin_unlock_bh(&ifp->lock);
53bd6749 1350 write_unlock_bh(&idev->lock);
f3213831
JP		 1351 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1352 __func__);
1da177e4
LT		 1353 in6_dev_put(idev);
1354 ret = -1;
1355 goto out;
1356 }
1357 in6_ifa_hold(ifp);
1358 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
969c5464
FG		 1359 ipv6_gen_rnd_iid(&addr);
1360
76f793e3 1361 age = (now - ifp->tstamp) / HZ;
76506a98
JB		 1362
1363 regen_advance = idev->cnf.regen_max_retry *
1364 idev->cnf.dad_transmits *
19e16d22 1365 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
76506a98
JB		 1366
1367 /* recalculate max_desync_factor each time and update
1368 * idev->desync_factor if it's larger
1369 */
7aa8e63f 1370 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
76506a98
JB		 1371 max_desync_factor = min_t(__u32,
1372 idev->cnf.max_desync_factor,
7aa8e63f 1373 cnf_temp_preferred_lft - regen_advance);
76506a98
JB		 1374
1375 if (unlikely(idev->desync_factor > max_desync_factor)) {
1376 if (max_desync_factor > 0) {
1377 get_random_bytes(&idev->desync_factor,
1378 sizeof(idev->desync_factor));
1379 idev->desync_factor %= max_desync_factor;
1380 } else {
1381 idev->desync_factor = 0;
1382 }
1383 }
1384
3f2d67b6 1385 memset(&cfg, 0, sizeof(cfg));
e6464b8c 1386 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
7a876b0e 1387 idev->cnf.temp_valid_lft + age);
e6464b8c
DA		 1388 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1389 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1390
1391 cfg.plen = ifp->prefix_len;
1da177e4
LT		 1392 tmp_tstamp = ifp->tstamp;
1393 spin_unlock_bh(&ifp->lock);
1394
53bd6749 1395 write_unlock_bh(&idev->lock);
95c385b4 1396
eac55bf9
BB		 1397 /* A temporary address is created only if this calculated Preferred
1398 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1399 * an implementation must not create a temporary address with a zero
1400 * Preferred Lifetime.
ecab6701
HK		 1401 * Use age calculation as in addrconf_verify to avoid unnecessary
1402 * temporary addresses being generated.
eac55bf9 1403 */
ecab6701 1404 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
e6464b8c 1405 if (cfg.preferred_lft <= regen_advance + age) {
eac55bf9
BB		 1406 in6_ifa_put(ifp);
1407 in6_dev_put(idev);
1408 ret = -1;
1409 goto out;
1410 }
1411
e6464b8c 1412 cfg.ifa_flags = IFA_F_TEMPORARY;
95c385b4
NH		 1413 /* set in addrconf_prefix_rcv() */
1414 if (ifp->flags & IFA_F_OPTIMISTIC)
e6464b8c 1415 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
95c385b4 1416
e6464b8c
DA		 1417 cfg.pfx = &addr;
1418 cfg.scope = ipv6_addr_scope(cfg.pfx);
95c385b4 1419
e6464b8c 1420 ift = ipv6_add_addr(idev, &cfg, block, NULL);
4b08a8f1 1421 if (IS_ERR(ift)) {
1da177e4
LT		 1422 in6_ifa_put(ifp);
1423 in6_dev_put(idev);
f3213831 1424 pr_info("%s: retry temporary address regeneration\n", __func__);
53bd6749 1425 write_lock_bh(&idev->lock);
1da177e4
LT		 1426 goto retry;
1427 }
1428
1429 spin_lock_bh(&ift->lock);
1430 ift->ifpub = ifp;
76f793e3 1431 ift->cstamp = now;
1da177e4
LT		 1432 ift->tstamp = tmp_tstamp;
1433 spin_unlock_bh(&ift->lock);
1434
cf22f9a2 1435 addrconf_dad_start(ift);
1da177e4
LT		 1436 in6_ifa_put(ift);
1437 in6_dev_put(idev);
1438out:
1439 return ret;
1440}
1da177e4
LT		 1441
1442/*
072047e4 1443 * Choose an appropriate source address (RFC3484)
1da177e4 1444 */
a9b05723
YH		 1445enum {
1446 IPV6_SADDR_RULE_INIT = 0,
1447 IPV6_SADDR_RULE_LOCAL,
1448 IPV6_SADDR_RULE_SCOPE,
1449 IPV6_SADDR_RULE_PREFERRED,
1450#ifdef CONFIG_IPV6_MIP6
1451 IPV6_SADDR_RULE_HOA,
1452#endif
1453 IPV6_SADDR_RULE_OIF,
1454 IPV6_SADDR_RULE_LABEL,
a9b05723 1455 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1456 IPV6_SADDR_RULE_ORCHID,
1457 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1458#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1459 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1460#endif
a9b05723
YH		 1461 IPV6_SADDR_RULE_MAX
1462};
1463
072047e4 1464struct ipv6_saddr_score {
a9b05723
YH		 1465 int rule;
1466 int addr_type;
1467 struct inet6_ifaddr *ifa;
1468 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1469 int scopedist;
1470 int matchlen;
072047e4
YH		 1471};
1472
a9b05723 1473struct ipv6_saddr_dst {
9acd9f3a 1474 const struct in6_addr *addr;
a9b05723
YH		 1475 int ifindex;
1476 int scope;
1477 int label;
7cbca67c 1478 unsigned int prefs;
a9b05723 1479};
072047e4 1480
b6f99a21 1481static inline int ipv6_saddr_preferred(int type)
1da177e4 1482{
45bb0060 1483 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1484 return 1;
1485 return 0;
1da177e4
LT		 1486}
1487
35e015e1
MC		 1488static bool ipv6_use_optimistic_addr(struct net *net,
1489 struct inet6_dev *idev)
7fd2561e
EK		 1490{
1491#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 1492 if (!idev)
1493 return false;
1494 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1495 return false;
1496 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1497 return false;
1498
1499 return true;
7fd2561e
EK		 1500#else
1501 return false;
1502#endif
1503}
1504
f1c02cfb
SD		 1505static bool ipv6_allow_optimistic_dad(struct net *net,
1506 struct inet6_dev *idev)
1507{
1508#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1509 if (!idev)
1510 return false;
1511 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1512 return false;
1513
1514 return true;
1515#else
1516 return false;
1517#endif
1518}
1519
3de23255
BT		 1520static int ipv6_get_saddr_eval(struct net *net,
1521 struct ipv6_saddr_score *score,
a9b05723
YH		 1522 struct ipv6_saddr_dst *dst,
1523 int i)
1524{
1525 int ret;
1526
1527 if (i <= score->rule) {
1528 switch (i) {
1529 case IPV6_SADDR_RULE_SCOPE:
1530 ret = score->scopedist;
1531 break;
1532 case IPV6_SADDR_RULE_PREFIX:
1533 ret = score->matchlen;
1534 break;
1535 default:
1536 ret = !!test_bit(i, score->scorebits);
1537 }
1538 goto out;
1539 }
1540
1541 switch (i) {
1542 case IPV6_SADDR_RULE_INIT:
1543 /* Rule 0: remember if hiscore is not ready yet */
1544 ret = !!score->ifa;
1545 break;
1546 case IPV6_SADDR_RULE_LOCAL:
1547 /* Rule 1: Prefer same address */
1548 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1549 break;
1550 case IPV6_SADDR_RULE_SCOPE:
1551 /* Rule 2: Prefer appropriate scope
1552 *
1553 * ret
1554 * ^
1555 * -1 | d 15
1556 * ---+--+-+---> scope
1557 * |
1558 * | d is scope of the destination.
1559 * B-d | \
1560 * | \ <- smaller scope is better if
db9c7c39 1561 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1562 * | ret = B - scope (-1 <= scope >= d <= 15).
1563 * d-C-1 | /
1564 * |/ <- greater is better
1565 * -C / if scope is not enough for destination.
1566 * /| ret = scope - C (-1 <= d < scope <= 15).
1567 *
1568 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1569 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1570 * Assume B = 0 and we get C > 29.
1571 */
1572 ret = __ipv6_addr_src_scope(score->addr_type);
1573 if (ret >= dst->scope)
1574 ret = -ret;
1575 else
1576 ret -= 128; /* 30 is enough */
1577 score->scopedist = ret;
1578 break;
1579 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1580 {
a9b05723 1581 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1582 u8 avoid = IFA_F_DEPRECATED;
1583
35e015e1 1584 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
7fd2561e 1585 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1586 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1587 !(score->ifa->flags & avoid);
a9b05723 1588 break;
7fd2561e 1589 }
a9b05723
YH		 1590#ifdef CONFIG_IPV6_MIP6
1591 case IPV6_SADDR_RULE_HOA:
7cbca67c 1592 {
a9b05723 1593 /* Rule 4: Prefer home address */
7cbca67c
YH		 1594 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1595 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1596 break;
7cbca67c 1597 }
a9b05723
YH		 1598#endif
1599 case IPV6_SADDR_RULE_OIF:
1600 /* Rule 5: Prefer outgoing interface */
1601 ret = (!dst->ifindex ||
1602 dst->ifindex == score->ifa->idev->dev->ifindex);
1603 break;
1604 case IPV6_SADDR_RULE_LABEL:
1605 /* Rule 6: Prefer matching label */
3de23255
BT		 1606 ret = ipv6_addr_label(net,
1607 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1608 score->ifa->idev->dev->ifindex) == dst->label;
1609 break;
a9b05723 1610 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1611 {
a9b05723 1612 /* Rule 7: Prefer public address
25985edc 1613 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1614 */
7cbca67c
YH		 1615 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1616 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1617 score->ifa->idev->cnf.use_tempaddr >= 2;
1618 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1619 break;
7cbca67c 1620 }
a9b05723
YH		 1621 case IPV6_SADDR_RULE_ORCHID:
1622 /* Rule 8-: Prefer ORCHID vs ORCHID or
1623 * non-ORCHID vs non-ORCHID
1624 */
1625 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1626 ipv6_addr_orchid(dst->addr));
1627 break;
1628 case IPV6_SADDR_RULE_PREFIX:
1629 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1630 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1631 if (ret > score->ifa->prefix_len)
1632 ret = score->ifa->prefix_len;
1633 score->matchlen = ret;
a9b05723 1634 break;
7fd2561e
EK		 1635#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1636 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1637 /* Optimistic addresses still have lower precedence than other
1638 * preferred addresses.
1639 */
1640 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1641 break;
1642#endif
a9b05723
YH		 1643 default:
1644 ret = 0;
1645 }
1646
1647 if (ret)
1648 __set_bit(i, score->scorebits);
1649 score->rule = i;
1650out:
1651 return ret;
1652}
1653
c0b8da1e
YH		 1654static int __ipv6_dev_get_saddr(struct net *net,
1655 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1656 struct inet6_dev *idev,
1657 struct ipv6_saddr_score *scores,
1658 int hiscore_idx)
9131f3de 1659{
c0b8da1e 1660 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de 1661
f59c031e 1662 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
9131f3de
YH		 1663 int i;
1664
1665 /*
1666 * - Tentative Address (RFC2462 section 5.4)
1667 * - A tentative address is not considered
1668 * "assigned to an interface" in the traditional
1669 * sense, unless it is also flagged as optimistic.
1670 * - Candidate Source Address (section 4)
1671 * - In any case, anycast addresses, multicast
1672 * addresses, and the unspecified address MUST
1673 * NOT be included in a candidate set.
1674 */
1675 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1676 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1677 continue;
1678
1679 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1680
1681 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1682 score->addr_type & IPV6_ADDR_MULTICAST)) {
1683 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1684 idev->dev->name);
1685 continue;
1686 }
1687
1688 score->rule = -1;
1689 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1690
1691 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1692 int minihiscore, miniscore;
1693
1694 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1695 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1696
1697 if (minihiscore > miniscore) {
1698 if (i == IPV6_SADDR_RULE_SCOPE &&
1699 score->scopedist > 0) {
1700 /*
1701 * special case:
1702 * each remaining entry
1703 * has too small (not enough)
1704 * scope, because ifa entries
1705 * are sorted by their scope
1706 * values.
1707 */
1708 goto out;
1709 }
1710 break;
1711 } else if (minihiscore < miniscore) {
9131f3de 1712 swap(hiscore, score);
c0b8da1e 1713 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1714
1715 /* restore our iterator */
1716 score->ifa = hiscore->ifa;
1717
1718 break;
1719 }
1720 }
1721 }
1722out:
c0b8da1e 1723 return hiscore_idx;
9131f3de
YH		 1724}
1725
afbac601
DA		 1726static int ipv6_get_saddr_master(struct net *net,
1727 const struct net_device *dst_dev,
1728 const struct net_device *master,
1729 struct ipv6_saddr_dst *dst,
1730 struct ipv6_saddr_score *scores,
1731 int hiscore_idx)
1732{
1733 struct inet6_dev *idev;
1734
1735 idev = __in6_dev_get(dst_dev);
1736 if (idev)
1737 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1738 scores, hiscore_idx);
1739
1740 idev = __in6_dev_get(master);
1741 if (idev)
1742 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1743 scores, hiscore_idx);
1744
1745 return hiscore_idx;
1746}
1747
b3f644fc 1748int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1749 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1750 struct in6_addr *saddr)
1da177e4 1751{
c0b8da1e 1752 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1753 struct ipv6_saddr_dst dst;
9131f3de 1754 struct inet6_dev *idev;
072047e4 1755 struct net_device *dev;
a9b05723 1756 int dst_type;
9131f3de 1757 bool use_oif_addr = false;
c0b8da1e 1758 int hiscore_idx = 0;
cc429c8f 1759 int ret = 0;
1da177e4 1760
a9b05723
YH		 1761 dst_type = __ipv6_addr_type(daddr);
1762 dst.addr = daddr;
1763 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1764 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1765 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1766 dst.prefs = prefs;
a9b05723 1767
c0b8da1e
YH		 1768 scores[hiscore_idx].rule = -1;
1769 scores[hiscore_idx].ifa = NULL;
1da177e4 1770
8814c4b5 1771 rcu_read_lock();
1da177e4 1772
9131f3de
YH		 1773 /* Candidate Source Address (section 4)
1774 * - multicast and link-local destination address,
1775 * the set of candidate source address MUST only
1776 * include addresses assigned to interfaces
1777 * belonging to the same link as the outgoing
1778 * interface.
1779 * (- For site-local destination addresses, the
1780 * set of candidate source addresses MUST only
1781 * include addresses assigned to interfaces
1782 * belonging to the same site as the outgoing
1783 * interface.)
3985e8a3
EK		 1784 * - "It is RECOMMENDED that the candidate source addresses
1785 * be the set of unicast addresses assigned to the
1786 * interface that will be used to send to the destination
1787 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1788 */
1789 if (dst_dev) {
3985e8a3 1790 idev = __in6_dev_get(dst_dev);
9131f3de 1791 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1792 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1793 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1794 use_oif_addr = true;
1795 }
1796 }
a9b05723 1797
9131f3de 1798 if (use_oif_addr) {
c0b8da1e 1799 if (idev)
c15df306 1800 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de 1801 } else {
afbac601
DA		 1802 const struct net_device *master;
1803 int master_idx = 0;
1804
1805 /* if dst_dev exists and is enslaved to an L3 device, then
1806 * prefer addresses from dst_dev and then the master over
1807 * any other enslaved devices in the L3 domain.
1808 */
1809 master = l3mdev_master_dev_rcu(dst_dev);
1810 if (master) {
1811 master_idx = master->ifindex;
1812
1813 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1814 master, &dst,
1815 scores, hiscore_idx);
1816
1817 if (scores[hiscore_idx].ifa)
1818 goto out;
1819 }
1820
9131f3de 1821 for_each_netdev_rcu(net, dev) {
afbac601
DA		 1822 /* only consider addresses on devices in the
1823 * same L3 domain
1824 */
1825 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1826 continue;
9131f3de
YH		 1827 idev = __in6_dev_get(dev);
1828 if (!idev)
072047e4 1829 continue;
c15df306 1830 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1831 }
1832 }
afbac601
DA		 1833
1834out:
c0b8da1e 1835 hiscore = &scores[hiscore_idx];
a9b05723 1836 if (!hiscore->ifa)
cc429c8f
ED		 1837 ret = -EADDRNOTAVAIL;
1838 else
1839 *saddr = hiscore->ifa->addr;
1ab1457c 1840
cc429c8f
ED		 1841 rcu_read_unlock();
1842 return ret;
1da177e4 1843}
5e5f3f0f 1844EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1845
26394fc1
IK		 1846static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1847 u32 banned_flags)
b7b1bfce
HFS		 1848{
1849 struct inet6_ifaddr *ifp;
1850 int err = -EADDRNOTAVAIL;
1851
602582ca
HFS		 1852 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1853 if (ifp->scope > IFA_LINK)
1854 break;
b7b1bfce
HFS		 1855 if (ifp->scope == IFA_LINK &&
1856 !(ifp->flags & banned_flags)) {
1857 *addr = ifp->addr;
1858 err = 0;
1859 break;
1860 }
1861 }
1862 return err;
1863}
1864
95c385b4 1865int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1866 u32 banned_flags)
1da177e4
LT		 1867{
1868 struct inet6_dev *idev;
1869 int err = -EADDRNOTAVAIL;
1870
8814c4b5 1871 rcu_read_lock();
e21e8467
SH		 1872 idev = __in6_dev_get(dev);
1873 if (idev) {
1da177e4 1874 read_lock_bh(&idev->lock);
b7b1bfce 1875 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1876 read_unlock_bh(&idev->lock);
1877 }
8814c4b5 1878 rcu_read_unlock();
1da177e4
LT		 1879 return err;
1880}
1881
d9bf82c2 1882static int ipv6_count_addresses(const struct inet6_dev *idev)
1da177e4 1883{
d9bf82c2 1884 const struct inet6_ifaddr *ifp;
1da177e4 1885 int cnt = 0;
1da177e4 1886
d9bf82c2
ED		 1887 rcu_read_lock();
1888 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1da177e4 1889 cnt++;
d9bf82c2 1890 rcu_read_unlock();
1da177e4
LT		 1891 return cnt;
1892}
1893
b71d1d42 1894int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1895 const struct net_device *dev, int strict)
c58da4c6 1896{
232378e8
DA		 1897 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1898 strict, IFA_F_TENTATIVE);
c58da4c6
EK		 1899}
1900EXPORT_SYMBOL(ipv6_chk_addr);
1901
1893ff20
DA		 1902/* device argument is used to find the L3 domain of interest. If
1903 * skip_dev_check is set, then the ifp device is not checked against
1904 * the passed in dev argument. So the 2 cases for addresses checks are:
1905 * 1. does the address exist in the L3 domain that dev is part of
1906 * (skip_dev_check = true), or
1907 *
1908 * 2. does the address exist on the specific device
1909 * (skip_dev_check = false)
1910 */
4ef1a7cb
XL		 1911static struct net_device *
1912__ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1913 const struct net_device *dev, bool skip_dev_check,
1914 int strict, u32 banned_flags)
1da177e4 1915{
3f27fb23 1916 unsigned int hash = inet6_addr_hash(net, addr);
4ef1a7cb 1917 struct net_device *l3mdev, *ndev;
eedf042a 1918 struct inet6_ifaddr *ifp;
c58da4c6 1919 u32 ifp_flags;
1da177e4 1920
480318a0 1921 rcu_read_lock();
232378e8 1922
1893ff20 1923 l3mdev = l3mdev_master_dev_rcu(dev);
232378e8
DA		 1924 if (skip_dev_check)
1925 dev = NULL;
1926
e66d1172 1927 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4ef1a7cb 1928 ndev = ifp->idev->dev;
1893ff20 1929
4ef1a7cb 1930 if (l3mdev_master_dev_rcu(ndev) != l3mdev)
1893ff20
DA		 1931 continue;
1932
c58da4c6
EK		 1933 /* Decouple optimistic from tentative for evaluation here.
1934 * Ban optimistic addresses explicitly, when required.
1935 */
1936 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1937 ? (ifp->flags&~IFA_F_TENTATIVE)
1938 : ifp->flags;
1da177e4 1939 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1940 !(ifp_flags&banned_flags) &&
4ef1a7cb 1941 (!dev || ndev == dev ||
eedf042a 1942 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
480318a0 1943 rcu_read_unlock();
4ef1a7cb 1944 return ndev;
1da177e4
LT		 1945 }
1946 }
5c578aed 1947
480318a0 1948 rcu_read_unlock();
4ef1a7cb
XL		 1949 return NULL;
1950}
1951
1952int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1953 const struct net_device *dev, bool skip_dev_check,
1954 int strict, u32 banned_flags)
1955{
1956 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check,
1957 strict, banned_flags) ? 1 : 0;
1da177e4 1958}
c58da4c6 1959EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1960
1da177e4 1961
7df37ff3
CB		 1962/* Compares an address/prefix_len with addresses on device @dev.
1963 * If one is found it returns true.
1964 */
1965bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1966 const unsigned int prefix_len, struct net_device *dev)
1967{
47e26941
ED		 1968 const struct inet6_ifaddr *ifa;
1969 const struct inet6_dev *idev;
7df37ff3
CB		 1970 bool ret = false;
1971
1972 rcu_read_lock();
1973 idev = __in6_dev_get(dev);
1974 if (idev) {
47e26941 1975 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
7df37ff3
CB		 1976 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1977 if (ret)
1978 break;
1979 }
7df37ff3
CB		 1980 }
1981 rcu_read_unlock();
1982
1983 return ret;
1984}
1985EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1986
b71d1d42 1987int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84 1988{
24ba333b
ED		 1989 const struct inet6_ifaddr *ifa;
1990 const struct inet6_dev *idev;
52eeeb84
YH		 1991 int onlink;
1992
1993 onlink = 0;
1994 rcu_read_lock();
1995 idev = __in6_dev_get(dev);
1996 if (idev) {
24ba333b 1997 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1998 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1999 ifa->prefix_len);
2000 if (onlink)
2001 break;
2002 }
52eeeb84
YH		 2003 }
2004 rcu_read_unlock();
2005 return onlink;
2006}
52eeeb84
YH		 2007EXPORT_SYMBOL(ipv6_chk_prefix);
2008
81f6cb31
XL		 2009/**
2010 * ipv6_dev_find - find the first device with a given source address.
2011 * @net: the net namespace
2012 * @addr: the source address
2c4de211 2013 * @dev: used to find the L3 domain of interest
81f6cb31
XL		 2014 *
2015 * The caller should be protected by RCU, or RTNL.
2016 */
4ef1a7cb
XL		 2017struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
2018 struct net_device *dev)
81f6cb31 2019{
4ef1a7cb
XL		 2020 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1,
2021 IFA_F_TENTATIVE);
81f6cb31
XL		 2022}
2023EXPORT_SYMBOL(ipv6_dev_find);
2024
9acd9f3a 2025struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 2026 struct net_device *dev, int strict)
1da177e4 2027{
3f27fb23 2028 unsigned int hash = inet6_addr_hash(net, addr);
b79d1d54 2029 struct inet6_ifaddr *ifp, *result = NULL;
1da177e4 2030
24f226da 2031 rcu_read_lock();
e66d1172 2032 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
1da177e4 2033 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 2034 if (!dev || ifp->idev->dev == dev ||
1da177e4 2035 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 2036 result = ifp;
1da177e4
LT		 2037 in6_ifa_hold(ifp);
2038 break;
2039 }
2040 }
2041 }
24f226da 2042 rcu_read_unlock();
1da177e4 2043
b79d1d54 2044 return result;
1da177e4
LT		 2045}
2046
1da177e4
LT		 2047/* Gets referenced address, destroys ifaddr */
2048
cc411d0b 2049static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 2050{
3d171f39
LR		 2051 if (dad_failed)
2052 ifp->flags |= IFA_F_DADFAILED;
2053
ec8add2a 2054 if (ifp->flags&IFA_F_TEMPORARY) {
1da177e4
LT		 2055 struct inet6_ifaddr *ifpub;
2056 spin_lock_bh(&ifp->lock);
2057 ifpub = ifp->ifpub;
2058 if (ifpub) {
2059 in6_ifa_hold(ifpub);
2060 spin_unlock_bh(&ifp->lock);
969c5464 2061 ipv6_create_tempaddr(ifpub, true);
1da177e4
LT		 2062 in6_ifa_put(ifpub);
2063 } else {
2064 spin_unlock_bh(&ifp->lock);
2065 }
2066 ipv6_del_addr(ifp);
ec8add2a
SD		 2067 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2068 spin_lock_bh(&ifp->lock);
2069 addrconf_del_dad_work(ifp);
2070 ifp->flags |= IFA_F_TENTATIVE;
f1c02cfb
SD		 2071 if (dad_failed)
2072 ifp->flags &= ~IFA_F_OPTIMISTIC;
ec8add2a
SD		 2073 spin_unlock_bh(&ifp->lock);
2074 if (dad_failed)
2075 ipv6_ifa_notify(0, ifp);
2076 in6_ifa_put(ifp);
c15b1cca 2077 } else {
1da177e4 2078 ipv6_del_addr(ifp);
c15b1cca 2079 }
1da177e4
LT		 2080}
2081
f2344a13
HX		 2082static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2083{
2084 int err = -ENOENT;
2085
8e8e676d 2086 spin_lock_bh(&ifp->lock);
f2344a13
HX		 2087 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2088 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2089 err = 0;
2090 }
8e8e676d 2091 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 2092
2093 return err;
2094}
2095
da13c59b 2096void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
3c21edbd 2097{
1b34be74 2098 struct inet6_dev *idev = ifp->idev;
e66d1172 2099 struct net *net = dev_net(idev->dev);
9bdd8d40 2100
853dc2e0
UB		 2101 if (addrconf_dad_end(ifp)) {
2102 in6_ifa_put(ifp);
f2344a13 2103 return;
853dc2e0 2104 }
f2344a13 2105
da13c59b
VP		 2106 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2107 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
9bdd8d40 2108
5f40ef77
HFS		 2109 spin_lock_bh(&ifp->lock);
2110
2111 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
5f40ef77
HFS		 2112 struct in6_addr new_addr;
2113 struct inet6_ifaddr *ifp2;
5f40ef77 2114 int retries = ifp->stable_privacy_retry + 1;
e6464b8c
DA		 2115 struct ifa6_config cfg = {
2116 .pfx = &new_addr,
2117 .plen = ifp->prefix_len,
2118 .ifa_flags = ifp->flags,
2119 .valid_lft = ifp->valid_lft,
2120 .preferred_lft = ifp->prefered_lft,
2121 .scope = ifp->scope,
2122 };
5f40ef77 2123
1855b7c3 2124 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 2125 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2126 ifp->idev->dev->name);
2127 goto errdad;
2128 }
2129
2130 new_addr = ifp->addr;
2131 if (ipv6_generate_stable_address(&new_addr, retries,
2132 idev))
2133 goto errdad;
2134
5f40ef77 2135 spin_unlock_bh(&ifp->lock);
1b34be74 2136
5f40ef77
HFS		 2137 if (idev->cnf.max_addresses &&
2138 ipv6_count_addresses(idev) >=
2139 idev->cnf.max_addresses)
2140 goto lock_errdad;
2141
2142 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2143 ifp->idev->dev->name);
2144
e6464b8c 2145 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
5f40ef77
HFS		 2146 if (IS_ERR(ifp2))
2147 goto lock_errdad;
2148
2149 spin_lock_bh(&ifp2->lock);
2150 ifp2->stable_privacy_retry = retries;
2151 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2152 spin_unlock_bh(&ifp2->lock);
2153
1855b7c3 2154 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 2155 in6_ifa_put(ifp2);
2156lock_errdad:
2157 spin_lock_bh(&ifp->lock);
1b34be74
YH		 2158 }
2159
5f40ef77 2160errdad:
c15b1cca
HFS		 2161 /* transition from _POSTDAD to _ERRDAD */
2162 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 2163 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 2164
2165 addrconf_mod_dad_work(ifp, 0);
751eb6b6 2166 in6_ifa_put(ifp);
3c21edbd 2167}
1da177e4 2168
a9ed4a29
SD		 2169/* Join to solicited addr multicast group.
2170 * caller must hold RTNL */
b71d1d42 2171void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 2172{
2173 struct in6_addr maddr;
2174
2175 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2176 return;
2177
2178 addrconf_addr_solict_mult(addr, &maddr);
2179 ipv6_dev_mc_inc(dev, &maddr);
2180}
2181
a9ed4a29 2182/* caller must hold RTNL */
b71d1d42 2183void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 2184{
2185 struct in6_addr maddr;
2186
2187 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2188 return;
2189
2190 addrconf_addr_solict_mult(addr, &maddr);
2191 __ipv6_dev_mc_dec(idev, &maddr);
2192}
2193
a9ed4a29 2194/* caller must hold RTNL */
20380731 2195static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2196{
2197 struct in6_addr addr;
c15b1cca 2198
88ad3149 2199 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 2200 return;
1da177e4
LT		 2201 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2202 if (ipv6_addr_any(&addr))
2203 return;
013b4d90 2204 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 2205}
2206
a9ed4a29 2207/* caller must hold RTNL */
20380731 2208static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2209{
2210 struct in6_addr addr;
c15b1cca 2211
88ad3149 2212 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 2213 return;
1da177e4
LT		 2214 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2215 if (ipv6_addr_any(&addr))
2216 return;
2217 __ipv6_dev_ac_dec(ifp->idev, &addr);
2218}
2219
8a7a4b47 2220static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
06a4c1c5 2221{
8a7a4b47
AA		 2222 switch (dev->addr_len) {
2223 case ETH_ALEN:
9dae2e03
LAD		 2224 memcpy(eui, dev->dev_addr, 3);
2225 eui[3] = 0xFF;
2226 eui[4] = 0xFE;
2227 memcpy(eui + 5, dev->dev_addr + 3, 3);
2228 break;
8a7a4b47
AA		 2229 case EUI64_ADDR_LEN:
2230 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2231 eui[0] ^= 2;
2232 break;
2233 default:
06a4c1c5 2234 return -1;
8a7a4b47
AA		 2235 }
2236
06a4c1c5 2237 return 0;
2238}
2239
cb6bf355
YH		 2240static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2241{
1a8a23d2 2242 const union fwnet_hwaddr *ha;
cb6bf355
YH		 2243
2244 if (dev->addr_len != FWNET_ALEN)
2245 return -1;
2246
1a8a23d2 2247 ha = (const union fwnet_hwaddr *)dev->dev_addr;
cb6bf355
YH		 2248
2249 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2250 eui[0] ^= 2;
2251 return 0;
2252}
2253
073a8e0e
YH		 2254static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2255{
2256 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2257 if (dev->addr_len != ARCNET_ALEN)
2258 return -1;
2259 memset(eui, 0, 7);
8e5e8f30 2260 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 2261 return 0;
2262}
2263
2264static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2265{
2266 if (dev->addr_len != INFINIBAND_ALEN)
2267 return -1;
2268 memcpy(eui, dev->dev_addr + 12, 8);
2269 eui[0] |= 2;
2270 return 0;
2271}
2272
c61393ea 2273static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2274{
9af28511
SH		 2275 if (addr == 0)
2276 return -1;
dfd982ba
YH		 2277 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2278 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2279 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2280 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2281 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2282 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2283 eui[1] = 0;
2284 eui[2] = 0x5E;
2285 eui[3] = 0xFE;
2286 memcpy(eui + 4, &addr, 4);
2287 return 0;
2288}
dfd982ba
YH		 2289
2290static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2291{
2292 if (dev->priv_flags & IFF_ISATAP)
2293 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2294 return -1;
2295}
2296
aee80b54 2297static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2298{
2299 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2300}
2301
e837735e
ND		 2302static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2303{
2304 memcpy(eui, dev->perm_addr, 3);
2305 memcpy(eui + 5, dev->perm_addr + 3, 3);
2306 eui[3] = 0xFF;
2307 eui[4] = 0xFE;
2308 eui[0] ^= 2;
2309 return 0;
2310}
2311
1da177e4
LT		 2312static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2313{
2314 switch (dev->type) {
2315 case ARPHRD_ETHER:
2316 case ARPHRD_FDDI:
073a8e0e 2317 return addrconf_ifid_eui48(eui, dev);
1da177e4 2318 case ARPHRD_ARCNET:
073a8e0e 2319 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2320 case ARPHRD_INFINIBAND:
073a8e0e 2321 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2322 case ARPHRD_SIT:
dfd982ba 2323 return addrconf_ifid_sit(eui, dev);
aee80b54 2324 case ARPHRD_IPGRE:
45ce0fd1 2325 case ARPHRD_TUNNEL:
aee80b54 2326 return addrconf_ifid_gre(eui, dev);
e74bccb8 2327 case ARPHRD_6LOWPAN:
8a7a4b47 2328 return addrconf_ifid_6lowpan(eui, dev);
cb6bf355
YH		 2329 case ARPHRD_IEEE1394:
2330 return addrconf_ifid_ieee1394(eui, dev);
e837735e 2331 case ARPHRD_TUNNEL6:
45ce0fd1 2332 case ARPHRD_IP6GRE:
9deb441c 2333 case ARPHRD_RAWIP:
e837735e 2334 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2335 }
2336 return -1;
2337}
2338
2339static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2340{
2341 int err = -1;
2342 struct inet6_ifaddr *ifp;
2343
2344 read_lock_bh(&idev->lock);
602582ca
HFS		 2345 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2346 if (ifp->scope > IFA_LINK)
2347 break;
1da177e4
LT		 2348 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2349 memcpy(eui, ifp->addr.s6_addr+8, 8);
2350 err = 0;
2351 break;
2352 }
2353 }
2354 read_unlock_bh(&idev->lock);
2355 return err;
2356}
2357
969c5464
FG		 2358/* Generation of a randomized Interface Identifier
2359 * draft-ietf-6man-rfc4941bis, Section 3.3.1
2360 */
2361
2362static void ipv6_gen_rnd_iid(struct in6_addr *addr)
1da177e4 2363{
1da177e4 2364regen:
969c5464 2365 get_random_bytes(&addr->s6_addr[8], 8);
1da177e4 2366
969c5464
FG		 2367 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1:
2368 * check if generated address is not inappropriate:
1da177e4 2369 *
912b519a 2370 * - Reserved IPv6 Interface Identifiers
969c5464 2371 * - XXX: already assigned to an address on the device
1da177e4 2372 */
969c5464
FG		 2373
2374 /* Subnet-router anycast: 0000:0000:0000:0000 */
2375 if (!(addr->s6_addr32[2] | addr->s6_addr32[3]))
1da177e4 2376 goto regen;
1da177e4 2377
969c5464
FG		 2378 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212
2379 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213
2380 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF
2381 */
2382 if (ntohl(addr->s6_addr32[2]) == 0x02005eff &&
2383 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000)
2384 goto regen;
2385
2386 /* Reserved subnet anycast addresses */
2387 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff &&
2388 ntohl(addr->s6_addr32[3]) >= 0Xffffff80)
2389 goto regen;
1da177e4 2390}
1da177e4
LT		 2391
2392/*
2393 * Add prefix route.
2394 */
2395
2396static void
8308f3ff
DA		 2397addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2398 struct net_device *dev, unsigned long expires,
2399 u32 flags, gfp_t gfp_flags)
1da177e4 2400{
86872cb5 2401 struct fib6_config cfg = {
ca254490 2402 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
8308f3ff 2403 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
86872cb5
TG		 2404 .fc_ifindex = dev->ifindex,
2405 .fc_expires = expires,
2406 .fc_dst_len = plen,
2407 .fc_flags = RTF_UP | flags,
c346dca1 2408 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2409 .fc_protocol = RTPROT_KERNEL,
e8478e80 2410 .fc_type = RTN_UNICAST,
86872cb5 2411 };
1da177e4 2412
4e3fd7a0 2413 cfg.fc_dst = *pfx;
1da177e4
LT		 2414
2415 /* Prevent useless cloning on PtP SIT.
2416 This thing is done here expecting that the whole
2417 class of non-broadcast devices need not cloning.
2418 */
07a93626 2419#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2420 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2421 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2422#endif
1da177e4 2423
acb54e3c 2424 ip6_route_add(&cfg, gfp_flags, NULL);
1da177e4
LT		 2425}
2426
14ef37b6 2427
8d1c802b 2428static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
14ef37b6
AH		 2429 int plen,
2430 const struct net_device *dev,
2b2450ca
DA		 2431 u32 flags, u32 noflags,
2432 bool no_gw)
14ef37b6
AH		 2433{
2434 struct fib6_node *fn;
8d1c802b 2435 struct fib6_info *rt = NULL;
14ef37b6 2436 struct fib6_table *table;
ca254490 2437 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2438
ca254490 2439 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2440 if (!table)
14ef37b6
AH		 2441 return NULL;
2442
66f5d6ce 2443 rcu_read_lock();
38fbeeee 2444 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
14ef37b6
AH		 2445 if (!fn)
2446 goto out;
1f56a01f 2447
66f5d6ce 2448 for_each_fib6_node_rt_rcu(fn) {
f88d8ea6
DA		 2449 /* prefix routes only use builtin fib6_nh */
2450 if (rt->nh)
2451 continue;
2452
1cf844c7 2453 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
14ef37b6 2454 continue;
1cf844c7 2455 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2b2450ca 2456 continue;
93c2fb25 2457 if ((rt->fib6_flags & flags) != flags)
14ef37b6 2458 continue;
93c2fb25 2459 if ((rt->fib6_flags & noflags) != 0)
14ef37b6 2460 continue;
e873e4b9
WW		 2461 if (!fib6_info_hold_safe(rt))
2462 continue;
14ef37b6
AH		 2463 break;
2464 }
2465out:
66f5d6ce 2466 rcu_read_unlock();
14ef37b6
AH		 2467 return rt;
2468}
2469
2470
1da177e4
LT		 2471/* Create "default" multicast route to the interface */
2472
2473static void addrconf_add_mroute(struct net_device *dev)
2474{
86872cb5 2475 struct fib6_config cfg = {
ca254490 2476 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2477 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2478 .fc_ifindex = dev->ifindex,
2479 .fc_dst_len = 8,
2480 .fc_flags = RTF_UP,
ceed9038 2481 .fc_type = RTN_MULTICAST,
c346dca1 2482 .fc_nlinfo.nl_net = dev_net(dev),
a826b043 2483 .fc_protocol = RTPROT_KERNEL,
86872cb5
TG		 2484 };
2485
2486 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2487
e500c6d3 2488 ip6_route_add(&cfg, GFP_KERNEL, NULL);
1da177e4
LT		 2489}
2490
1da177e4
LT		 2491static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2492{
2493 struct inet6_dev *idev;
2494
2495 ASSERT_RTNL();
2496
e21e8467 2497 idev = ipv6_find_idev(dev);
db0b99f5
SD		 2498 if (IS_ERR(idev))
2499 return idev;
64e724f6
BH		 2500
2501 if (idev->cnf.disable_ipv6)
2502 return ERR_PTR(-EACCES);
1da177e4
LT		 2503
2504 /* Add default multicast route */
ba46ee4c 2505 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
4af04aba 2506 addrconf_add_mroute(dev);
1da177e4 2507
1da177e4
LT		 2508 return idev;
2509}
2510
53bd6749
JP		 2511static void manage_tempaddrs(struct inet6_dev *idev,
2512 struct inet6_ifaddr *ifp,
2513 __u32 valid_lft, __u32 prefered_lft,
2514 bool create, unsigned long now)
2515{
2516 u32 flags;
2517 struct inet6_ifaddr *ift;
2518
2519 read_lock_bh(&idev->lock);
2520 /* update all temporary addresses in the list */
2521 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2522 int age, max_valid, max_prefered;
2523
2524 if (ifp != ift->ifpub)
2525 continue;
2526
2527 /* RFC 4941 section 3.3:
2528 * If a received option will extend the lifetime of a public
2529 * address, the lifetimes of temporary addresses should
2530 * be extended, subject to the overall constraint that no
2531 * temporary addresses should ever remain "valid" or "preferred"
2532 * for a time longer than (TEMP_VALID_LIFETIME) or
2533 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2534 */
2535 age = (now - ift->cstamp) / HZ;
2536 max_valid = idev->cnf.temp_valid_lft - age;
2537 if (max_valid < 0)
2538 max_valid = 0;
2539
2540 max_prefered = idev->cnf.temp_prefered_lft -
76506a98 2541 idev->desync_factor - age;
53bd6749
JP		 2542 if (max_prefered < 0)
2543 max_prefered = 0;
2544
2545 if (valid_lft > max_valid)
2546 valid_lft = max_valid;
2547
2548 if (prefered_lft > max_prefered)
2549 prefered_lft = max_prefered;
2550
2551 spin_lock(&ift->lock);
2552 flags = ift->flags;
2553 ift->valid_lft = valid_lft;
2554 ift->prefered_lft = prefered_lft;
2555 ift->tstamp = now;
2556 if (prefered_lft > 0)
2557 ift->flags &= ~IFA_F_DEPRECATED;
2558
2559 spin_unlock(&ift->lock);
2560 if (!(flags&IFA_F_TENTATIVE))
2561 ipv6_ifa_notify(0, ift);
2562 }
2563
69172f0b
MŻ		 2564 /* Also create a temporary address if it's enabled but no temporary
2565 * address currently exists.
2566 * However, we get called with valid_lft == 0, prefered_lft == 0, create == false
2567 * as part of cleanup (ie. deleting the mngtmpaddr).
2568 * We don't want that to result in creating a new temporary ip address.
2569 */
2570 if (list_empty(&idev->tempaddr_list) && (valid_lft || prefered_lft))
2571 create = true;
2572
2573 if (create && idev->cnf.use_tempaddr > 0) {
53bd6749
JP		 2574 /* When a new public address is created as described
2575 * in [ADDRCONF], also create a new temporary address.
53bd6749
JP		 2576 */
2577 read_unlock_bh(&idev->lock);
969c5464 2578 ipv6_create_tempaddr(ifp, false);
53bd6749
JP		 2579 } else {
2580 read_unlock_bh(&idev->lock);
2581 }
2582}
2583
cc9da6cc
BM		 2584static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2585{
d35a00b8
FJ		 2586 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2587 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc
BM		 2588}
2589
cc84b3c6
AA		 2590int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2591 const struct prefix_info *pinfo,
2592 struct inet6_dev *in6_dev,
2593 const struct in6_addr *addr, int addr_type,
2594 u32 addr_flags, bool sllao, bool tokenized,
2595 __u32 valid_lft, u32 prefered_lft)
4f672235
AA		 2596{
2597 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
36268983 2598 int create = 0, update_lft = 0;
4f672235
AA		 2599
2600 if (!ifp && valid_lft) {
2601 int max_addresses = in6_dev->cnf.max_addresses;
e6464b8c
DA		 2602 struct ifa6_config cfg = {
2603 .pfx = addr,
2604 .plen = pinfo->prefix_len,
2605 .ifa_flags = addr_flags,
2606 .valid_lft = valid_lft,
2607 .preferred_lft = prefered_lft,
2608 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
47f0bd50 2609 .ifa_proto = IFAPROT_KERNEL_RA
e6464b8c 2610 };
4f672235
AA		 2611
2612#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 2613 if ((net->ipv6.devconf_all->optimistic_dad ||
2614 in6_dev->cnf.optimistic_dad) &&
4f672235 2615 !net->ipv6.devconf_all->forwarding && sllao)
e6464b8c 2616 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
4f672235
AA		 2617#endif
2618
2619 /* Do not allow to create too much of autoconfigured
2620 * addresses; this would be too easy way to crash kernel.
2621 */
2622 if (!max_addresses ||
2623 ipv6_count_addresses(in6_dev) < max_addresses)
e6464b8c 2624 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
4f672235
AA		 2625
2626 if (IS_ERR_OR_NULL(ifp))
2627 return -1;
2628
4f672235
AA		 2629 create = 1;
2630 spin_lock_bh(&ifp->lock);
2631 ifp->flags |= IFA_F_MANAGETEMPADDR;
2632 ifp->cstamp = jiffies;
2633 ifp->tokenized = tokenized;
2634 spin_unlock_bh(&ifp->lock);
2635 addrconf_dad_start(ifp);
2636 }
2637
2638 if (ifp) {
2639 u32 flags;
2640 unsigned long now;
2641 u32 stored_lft;
2642
36268983 2643 /* update lifetime (RFC2462 5.5.3 e) */
4f672235
AA		 2644 spin_lock_bh(&ifp->lock);
2645 now = jiffies;
2646 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2647 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2648 else
2649 stored_lft = 0;
b75326c2 2650 if (!create && stored_lft) {
36268983
GN		 2651 const u32 minimum_lft = min_t(u32,
2652 stored_lft, MIN_VALID_LIFETIME);
2653 valid_lft = max(valid_lft, minimum_lft);
2654
2655 /* RFC4862 Section 5.5.3e:
2656 * "Note that the preferred lifetime of the
2657 * corresponding address is always reset to
2658 * the Preferred Lifetime in the received
2659 * Prefix Information option, regardless of
2660 * whether the valid lifetime is also reset or
2661 * ignored."
2662 *
2663 * So we should always update prefered_lft here.
2664 */
2665 update_lft = 1;
2666 }
2667
2668 if (update_lft) {
4f672235
AA		 2669 ifp->valid_lft = valid_lft;
2670 ifp->prefered_lft = prefered_lft;
2671 ifp->tstamp = now;
2672 flags = ifp->flags;
2673 ifp->flags &= ~IFA_F_DEPRECATED;
2674 spin_unlock_bh(&ifp->lock);
2675
2676 if (!(flags&IFA_F_TENTATIVE))
2677 ipv6_ifa_notify(0, ifp);
2678 } else
2679 spin_unlock_bh(&ifp->lock);
2680
2681 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2682 create, now);
2683
2684 in6_ifa_put(ifp);
8805d13f 2685 addrconf_verify(net);
4f672235
AA		 2686 }
2687
2688 return 0;
2689}
cc84b3c6 2690EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
4f672235 2691
e6bff995 2692void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2693{
2694 struct prefix_info *pinfo;
2695 __u32 valid_lft;
2696 __u32 prefered_lft;
4f672235 2697 int addr_type, err;
64236f3f 2698 u32 addr_flags = 0;
1da177e4 2699 struct inet6_dev *in6_dev;
56d417b1 2700 struct net *net = dev_net(dev);
1da177e4
LT		 2701
2702 pinfo = (struct prefix_info *) opt;
1ab1457c 2703
1da177e4 2704 if (len < sizeof(struct prefix_info)) {
e32ac250 2705 netdev_dbg(dev, "addrconf: prefix option too short\n");
1da177e4
LT		 2706 return;
2707 }
1ab1457c 2708
1da177e4
LT		 2709 /*
2710 * Validation checks ([ADDRCONF], page 19)
2711 */
2712
2713 addr_type = ipv6_addr_type(&pinfo->prefix);
2714
2715 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2716 return;
2717
2718 valid_lft = ntohl(pinfo->valid);
2719 prefered_lft = ntohl(pinfo->prefered);
2720
2721 if (prefered_lft > valid_lft) {
e87cc472 2722 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2723 return;
2724 }
2725
2726 in6_dev = in6_dev_get(dev);
2727
63159f29 2728 if (!in6_dev) {
e87cc472
JP		 2729 net_dbg_ratelimited("addrconf: device %s not configured\n",
2730 dev->name);
1da177e4
LT		 2731 return;
2732 }
2733
2734 /*
2735 * Two things going on here:
2736 * 1) Add routes for on-link prefixes
2737 * 2) Configure prefixes with the auto flag set
2738 */
2739
4bed72e4 2740 if (pinfo->onlink) {
8d1c802b 2741 struct fib6_info *rt;
4bed72e4
YH		 2742 unsigned long rt_expires;
2743
6f704992
YH		 2744 /* Avoid arithmetic overflow. Really, we could
2745 * save rt_expires in seconds, likely valid_lft,
2746 * but it would require division in fib gc, that it
2747 * not good.
2748 */
4bed72e4
YH		 2749 if (HZ > USER_HZ)
2750 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2751 else
2752 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2753
4bed72e4
YH		 2754 if (addrconf_finite_timeout(rt_expires))
2755 rt_expires *= HZ;
1da177e4 2756
14ef37b6
AH		 2757 rt = addrconf_get_prefix_route(&pinfo->prefix,
2758 pinfo->prefix_len,
2759 dev,
2760 RTF_ADDRCONF | RTF_PREFIX_RT,
2b2450ca 2761 RTF_DEFAULT, true);
1da177e4 2762
14ef37b6 2763 if (rt) {
6f704992
YH		 2764 /* Autoconf prefix route */
2765 if (valid_lft == 0) {
11dd74b3 2766 ip6_del_rt(net, rt, false);
6f704992 2767 rt = NULL;
4bed72e4 2768 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2769 /* not infinity */
14895687 2770 fib6_set_expires(rt, jiffies + rt_expires);
6f704992 2771 } else {
14895687 2772 fib6_clean_expires(rt);
1da177e4
LT		 2773 }
2774 } else if (valid_lft) {
6f704992 2775 clock_t expires = 0;
4bed72e4
YH		 2776 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2777 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2778 /* not infinity */
2779 flags |= RTF_EXPIRES;
2780 expires = jiffies_to_clock_t(rt_expires);
2781 }
1da177e4 2782 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
8308f3ff
DA		 2783 0, dev, expires, flags,
2784 GFP_ATOMIC);
1da177e4 2785 }
93531c67 2786 fib6_info_release(rt);
1da177e4
LT		 2787 }
2788
2789 /* Try to figure out our local address for this prefix */
2790
2791 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1da177e4 2792 struct in6_addr addr;
f997c55c 2793 bool tokenized = false, dev_addr_generated = false;
1da177e4
LT		 2794
2795 if (pinfo->prefix_len == 64) {
2796 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2797
2798 if (!ipv6_addr_any(&in6_dev->token)) {
2799 read_lock_bh(&in6_dev->lock);
2800 memcpy(addr.s6_addr + 8,
2801 in6_dev->token.s6_addr + 8, 8);
2802 read_unlock_bh(&in6_dev->lock);
617fe29d 2803 tokenized = true;
cc9da6cc 2804 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2805 !ipv6_generate_stable_address(&addr, 0,
2806 in6_dev)) {
64236f3f 2807 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2808 goto ok;
f53adae4
DB		 2809 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2810 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
4f672235 2811 goto put;
f997c55c
AA		 2812 } else {
2813 dev_addr_generated = true;
1da177e4
LT		 2814 }
2815 goto ok;
2816 }
e87cc472
JP		 2817 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2818 pinfo->prefix_len);
4f672235 2819 goto put;
1da177e4
LT		 2820
2821ok:
4f672235
AA		 2822 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2823 &addr, addr_type,
2824 addr_flags, sllao,
2825 tokenized, valid_lft,
2826 prefered_lft);
2827 if (err)
2828 goto put;
f997c55c
AA		 2829
2830 /* Ignore error case here because previous prefix add addr was
2831 * successful which will be notified.
2832 */
2833 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2834 addr_type, addr_flags, sllao,
2835 tokenized, valid_lft,
2836 prefered_lft,
2837 dev_addr_generated);
1da177e4
LT		 2838 }
2839 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
4f672235 2840put:
1da177e4
LT		 2841 in6_dev_put(in6_dev);
2842}
2843
68ad6886
CH		 2844static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
2845 struct in6_ifreq *ireq)
2846{
2847 struct ip_tunnel_parm p = { };
68ad6886
CH		 2848 int err;
2849
2850 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
2851 return -EADDRNOTAVAIL;
2852
2853 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3];
2854 p.iph.version = 4;
2855 p.iph.ihl = 5;
2856 p.iph.protocol = IPPROTO_IPV6;
2857 p.iph.ttl = 64;
68ad6886 2858
8e3db0bb 2859 if (!dev->netdev_ops->ndo_tunnel_ctl)
68ad6886 2860 return -EOPNOTSUPP;
8e3db0bb 2861 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
68ad6886
CH		 2862 if (err)
2863 return err;
2864
2865 dev = __dev_get_by_name(net, p.name);
2866 if (!dev)
2867 return -ENOBUFS;
2868 return dev_open(dev, NULL);
2869}
2870
1da177e4
LT		 2871/*
2872 * Set destination address.
2873 * Special case for SIT interfaces where we create a new "virtual"
2874 * device.
2875 */
af284937 2876int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4 2877{
1da177e4 2878 struct net_device *dev;
68ad6886
CH		 2879 struct in6_ifreq ireq;
2880 int err = -ENODEV;
1da177e4 2881
f0988460
CH		 2882 if (!IS_ENABLED(CONFIG_IPV6_SIT))
2883 return -ENODEV;
1da177e4 2884 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
68ad6886 2885 return -EFAULT;
1da177e4 2886
68ad6886 2887 rtnl_lock();
af284937 2888 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
68ad6886
CH		 2889 if (dev && dev->type == ARPHRD_SIT)
2890 err = addrconf_set_sit_dstaddr(net, dev, &ireq);
1da177e4
LT		 2891 rtnl_unlock();
2892 return err;
2893}
2894
93a714d6
MC		 2895static int ipv6_mc_config(struct sock *sk, bool join,
2896 const struct in6_addr *addr, int ifindex)
2897{
2898 int ret;
2899
2900 ASSERT_RTNL();
2901
2902 lock_sock(sk);
2903 if (join)
54ff9ef3 2904 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2905 else
54ff9ef3 2906 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2907 release_sock(sk);
2908
2909 return ret;
2910}
2911
1da177e4
LT		 2912/*
2913 * Manual configuration of address on an interface
2914 */
479840ff 2915static int inet6_addr_add(struct net *net, int ifindex,
19b1518c 2916 struct ifa6_config *cfg,
de95e047 2917 struct netlink_ext_ack *extack)
1da177e4
LT		 2918{
2919 struct inet6_ifaddr *ifp;
2920 struct inet6_dev *idev;
2921 struct net_device *dev;
93a714d6
MC		 2922 unsigned long timeout;
2923 clock_t expires;
6f704992 2924 u32 flags;
1da177e4
LT		 2925
2926 ASSERT_RTNL();
1ab1457c 2927
19b1518c 2928 if (cfg->plen > 128)
24ef0da7
TG		 2929 return -EINVAL;
2930
0778769d 2931 /* check the lifetime */
19b1518c 2932 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
0778769d
NT		 2933 return -EINVAL;
2934
19b1518c 2935 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
53bd6749
JP		 2936 return -EINVAL;
2937
af284937
DL		 2938 dev = __dev_get_by_index(net, ifindex);
2939 if (!dev)
1da177e4 2940 return -ENODEV;
1ab1457c 2941
64e724f6
BH		 2942 idev = addrconf_add_dev(dev);
2943 if (IS_ERR(idev))
2944 return PTR_ERR(idev);
1da177e4 2945
19b1518c 2946 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
93a714d6 2947 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
19b1518c 2948 true, cfg->pfx, ifindex);
93a714d6
MC		 2949
2950 if (ret < 0)
2951 return ret;
2952 }
2953
19b1518c 2954 cfg->scope = ipv6_addr_scope(cfg->pfx);
1da177e4 2955
19b1518c 2956 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4bed72e4
YH		 2957 if (addrconf_finite_timeout(timeout)) {
2958 expires = jiffies_to_clock_t(timeout * HZ);
19b1518c 2959 cfg->valid_lft = timeout;
6f704992 2960 flags = RTF_EXPIRES;
4bed72e4
YH		 2961 } else {
2962 expires = 0;
2963 flags = 0;
19b1518c 2964 cfg->ifa_flags |= IFA_F_PERMANENT;
6f704992 2965 }
0778769d 2966
19b1518c 2967 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4bed72e4
YH		 2968 if (addrconf_finite_timeout(timeout)) {
2969 if (timeout == 0)
19b1518c
DA		 2970 cfg->ifa_flags |= IFA_F_DEPRECATED;
2971 cfg->preferred_lft = timeout;
4bed72e4 2972 }
0778769d 2973
19b1518c 2974 ifp = ipv6_add_addr(idev, cfg, true, extack);
1da177e4 2975 if (!IS_ERR(ifp)) {
19b1518c 2976 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
8308f3ff
DA		 2977 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2978 ifp->rt_priority, dev, expires,
2979 flags, GFP_KERNEL);
761aac73
TH		 2980 }
2981
a2d481b3
LB		 2982 /* Send a netlink notification if DAD is enabled and
2983 * optimistic flag is not set
2984 */
2985 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2986 ipv6_ifa_notify(0, ifp);
95c385b4
NH		 2987 /*
2988 * Note that section 3.1 of RFC 4429 indicates
2989 * that the Optimistic flag should not be set for
2990 * manually configured addresses
2991 */
cf22f9a2 2992 addrconf_dad_start(ifp);
19b1518c
DA		 2993 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2994 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2995 cfg->preferred_lft, true, jiffies);
1da177e4 2996 in6_ifa_put(ifp);
8805d13f 2997 addrconf_verify_rtnl(net);
1da177e4 2998 return 0;
19b1518c
DA		 2999 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
3000 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
3001 cfg->pfx, ifindex);
1da177e4
LT		 3002 }
3003
3004 return PTR_ERR(ifp);
3005}
3006
6046d5b4
HK		 3007static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
3008 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 3009{
3010 struct inet6_ifaddr *ifp;
3011 struct inet6_dev *idev;
3012 struct net_device *dev;
1ab1457c 3013
24ef0da7
TG		 3014 if (plen > 128)
3015 return -EINVAL;
3016
af284937
DL		 3017 dev = __dev_get_by_index(net, ifindex);
3018 if (!dev)
1da177e4
LT		 3019 return -ENODEV;
3020
e5d08d71 3021 idev = __in6_dev_get(dev);
63159f29 3022 if (!idev)
1da177e4
LT		 3023 return -ENXIO;
3024
3025 read_lock_bh(&idev->lock);
502a2ffd 3026 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 3027 if (ifp->prefix_len == plen &&
3028 ipv6_addr_equal(pfx, &ifp->addr)) {
3029 in6_ifa_hold(ifp);
3030 read_unlock_bh(&idev->lock);
1ab1457c 3031
6046d5b4
HK		 3032 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3033 (ifa_flags & IFA_F_MANAGETEMPADDR))
3034 manage_tempaddrs(idev, ifp, 0, 0, false,
3035 jiffies);
1da177e4 3036 ipv6_del_addr(ifp);
8805d13f 3037 addrconf_verify_rtnl(net);
93a714d6
MC		 3038 if (ipv6_addr_is_multicast(pfx)) {
3039 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3040 false, pfx, dev->ifindex);
3041 }
1da177e4
LT		 3042 return 0;
3043 }
3044 }
3045 read_unlock_bh(&idev->lock);
3046 return -EADDRNOTAVAIL;
3047}
3048
3049
af284937 3050int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4 3051{
19b1518c
DA		 3052 struct ifa6_config cfg = {
3053 .ifa_flags = IFA_F_PERMANENT,
3054 .preferred_lft = INFINITY_LIFE_TIME,
3055 .valid_lft = INFINITY_LIFE_TIME,
3056 };
1da177e4
LT		 3057 struct in6_ifreq ireq;
3058 int err;
1ab1457c 3059
af31f412 3060 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 3061 return -EPERM;
1ab1457c 3062
1da177e4
LT		 3063 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3064 return -EFAULT;
3065
19b1518c
DA		 3066 cfg.pfx = &ireq.ifr6_addr;
3067 cfg.plen = ireq.ifr6_prefixlen;
3068
1da177e4 3069 rtnl_lock();
19b1518c 3070 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
1da177e4
LT		 3071 rtnl_unlock();
3072 return err;
3073}
3074
af284937 3075int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 3076{
3077 struct in6_ifreq ireq;
3078 int err;
1ab1457c 3079
af31f412 3080 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 3081 return -EPERM;
3082
3083 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3084 return -EFAULT;
3085
3086 rtnl_lock();
6046d5b4 3087 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 3088 ireq.ifr6_prefixlen);
1da177e4
LT		 3089 rtnl_unlock();
3090 return err;
3091}
3092
b5f348e5 3093static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
47f0bd50 3094 int plen, int scope, u8 proto)
b5f348e5
IJ		 3095{
3096 struct inet6_ifaddr *ifp;
e6464b8c
DA		 3097 struct ifa6_config cfg = {
3098 .pfx = addr,
3099 .plen = plen,
3100 .ifa_flags = IFA_F_PERMANENT,
3101 .valid_lft = INFINITY_LIFE_TIME,
3102 .preferred_lft = INFINITY_LIFE_TIME,
47f0bd50
JL		 3103 .scope = scope,
3104 .ifa_proto = proto
e6464b8c 3105 };
b5f348e5 3106
e6464b8c 3107 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
b5f348e5
IJ		 3108 if (!IS_ERR(ifp)) {
3109 spin_lock_bh(&ifp->lock);
3110 ifp->flags &= ~IFA_F_TENTATIVE;
3111 spin_unlock_bh(&ifp->lock);
764d3be6 3112 rt_genid_bump_ipv6(dev_net(idev->dev));
b5f348e5
IJ		 3113 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3114 in6_ifa_put(ifp);
3115 }
3116}
3117
e5dd7294
AQ		 3118#if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3119static void add_v4_addrs(struct inet6_dev *idev)
1da177e4 3120{
1da177e4
LT		 3121 struct in6_addr addr;
3122 struct net_device *dev;
c346dca1 3123 struct net *net = dev_net(idev->dev);
e5dd7294 3124 int scope, plen, offset = 0;
f0e2acfa 3125 u32 pflags = 0;
1da177e4
LT		 3126
3127 ASSERT_RTNL();
3128
3129 memset(&addr, 0, sizeof(struct in6_addr));
e5dd7294
AQ		 3130 /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */
3131 if (idev->dev->addr_len == sizeof(struct in6_addr))
3132 offset = sizeof(struct in6_addr) - 4;
3133 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4);
1da177e4 3134
30e2291f
TW		 3135 if (!(idev->dev->flags & IFF_POINTOPOINT) && idev->dev->type == ARPHRD_SIT) {
3136 scope = IPV6_ADDR_COMPATv4;
3137 plen = 96;
3138 pflags |= RTF_NONEXTHOP;
3139 } else {
61e18ce7
SS		 3140 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE)
3141 return;
3142
1da177e4
LT		 3143 addr.s6_addr32[0] = htonl(0xfe800000);
3144 scope = IFA_LINK;
929c9cf3 3145 plen = 64;
1da177e4
LT		 3146 }
3147
3148 if (addr.s6_addr32[3]) {
47f0bd50 3149 add_addr(idev, &addr, plen, scope, IFAPROT_UNSPEC);
8308f3ff 3150 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
e500c6d3 3151 GFP_KERNEL);
1da177e4
LT		 3152 return;
3153 }
3154
6fda7350 3155 for_each_netdev(net, dev) {
8e5e8f30 3156 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 3157 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 3158 struct in_ifaddr *ifa;
1da177e4
LT		 3159 int flag = scope;
3160
cd5a411d 3161 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1da177e4
LT		 3162 addr.s6_addr32[3] = ifa->ifa_local;
3163
3164 if (ifa->ifa_scope == RT_SCOPE_LINK)
3165 continue;
3166 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3167 if (idev->dev->flags&IFF_POINTOPOINT)
3168 continue;
3169 flag |= IFA_HOST;
3170 }
1da177e4 3171
47f0bd50
JL		 3172 add_addr(idev, &addr, plen, flag,
3173 IFAPROT_UNSPEC);
8308f3ff 3174 addrconf_prefix_route(&addr, plen, 0, idev->dev,
e500c6d3 3175 0, pflags, GFP_KERNEL);
1da177e4
LT		 3176 }
3177 }
1ab1457c 3178 }
1da177e4 3179}
0be669bb 3180#endif
1da177e4
LT		 3181
3182static void init_loopback(struct net_device *dev)
3183{
3184 struct inet6_dev *idev;
1da177e4
LT		 3185
3186 /* ::1 */
3187
3188 ASSERT_RTNL();
3189
e5d08d71 3190 idev = ipv6_find_idev(dev);
db0b99f5 3191 if (IS_ERR(idev)) {
91df42be 3192 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3193 return;
3194 }
3195
47f0bd50 3196 add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFAPROT_KERNEL_LO);
1da177e4
LT		 3197}
3198
2ad3ed59
AA		 3199void addrconf_add_linklocal(struct inet6_dev *idev,
3200 const struct in6_addr *addr, u32 flags)
1da177e4 3201{
e6464b8c
DA		 3202 struct ifa6_config cfg = {
3203 .pfx = addr,
3204 .plen = 64,
3205 .ifa_flags = flags | IFA_F_PERMANENT,
3206 .valid_lft = INFINITY_LIFE_TIME,
3207 .preferred_lft = INFINITY_LIFE_TIME,
47f0bd50
JL		 3208 .scope = IFA_LINK,
3209 .ifa_proto = IFAPROT_KERNEL_LL
e6464b8c 3210 };
8e5e8f30 3211 struct inet6_ifaddr *ifp;
95c385b4
NH		 3212
3213#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 3214 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3215 idev->cnf.optimistic_dad) &&
702beb87 3216 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
e6464b8c 3217 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
95c385b4 3218#endif
1da177e4 3219
e6464b8c 3220 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
1da177e4 3221 if (!IS_ERR(ifp)) {
8308f3ff 3222 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
acb54e3c 3223 0, 0, GFP_ATOMIC);
cf22f9a2 3224 addrconf_dad_start(ifp);
1da177e4
LT		 3225 in6_ifa_put(ifp);
3226 }
3227}
2ad3ed59 3228EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
1da177e4 3229
622c81d5
HFS		 3230static bool ipv6_reserved_interfaceid(struct in6_addr address)
3231{
3232 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3233 return true;
3234
3235 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3236 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3237 return true;
3238
3239 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3240 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3241 return true;
3242
3243 return false;
3244}
3245
3246static int ipv6_generate_stable_address(struct in6_addr *address,
3247 u8 dad_count,
3248 const struct inet6_dev *idev)
3249{
622c81d5 3250 static DEFINE_SPINLOCK(lock);
6b0b0fa2
EB		 3251 static __u32 digest[SHA1_DIGEST_WORDS];
3252 static __u32 workspace[SHA1_WORKSPACE_WORDS];
622c81d5
HFS		 3253
3254 static union {
6b0b0fa2 3255 char __data[SHA1_BLOCK_SIZE];
622c81d5
HFS		 3256 struct {
3257 struct in6_addr secret;
ff40217e 3258 __be32 prefix[2];
622c81d5
HFS		 3259 unsigned char hwaddr[MAX_ADDR_LEN];
3260 u8 dad_count;
3261 } __packed;
3262 } data;
3263
3264 struct in6_addr secret;
3265 struct in6_addr temp;
3266 struct net *net = dev_net(idev->dev);
3267
3268 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3269
3270 if (idev->cnf.stable_secret.initialized)
3271 secret = idev->cnf.stable_secret.secret;
3272 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3273 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3274 else
3275 return -1;
3276
3277retry:
3278 spin_lock_bh(&lock);
3279
6b0b0fa2 3280 sha1_init(digest);
622c81d5
HFS		 3281 memset(&data, 0, sizeof(data));
3282 memset(workspace, 0, sizeof(workspace));
3283 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3284 data.prefix[0] = address->s6_addr32[0];
3285 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3286 data.secret = secret;
3287 data.dad_count = dad_count;
3288
6b0b0fa2 3289 sha1_transform(digest, data.__data, workspace);
622c81d5
HFS		 3290
3291 temp = *address;
ff40217e
HFS		 3292 temp.s6_addr32[2] = (__force __be32)digest[0];
3293 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3294
3295 spin_unlock_bh(&lock);
3296
3297 if (ipv6_reserved_interfaceid(temp)) {
3298 dad_count++;
1855b7c3 3299 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3300 return -1;
3301 goto retry;
3302 }
3303
3304 *address = temp;
3305 return 0;
3306}
3307
cc9da6cc
BM		 3308static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3309{
3310 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3311
3312 if (s->initialized)
3313 return;
3314 s = &idev->cnf.stable_secret;
3315 get_random_bytes(&s->secret, sizeof(s->secret));
3316 s->initialized = true;
3317}
3318
bc91b0f0
JP		 3319static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3320{
622c81d5
HFS		 3321 struct in6_addr addr;
3322
ca254490
DA		 3323 /* no link local addresses on L3 master devices */
3324 if (netif_is_l3_master(idev->dev))
3325 return;
3326
744fdc82 3327 /* no link local addresses on devices flagged as slaves */
8a321cf7 3328 if (idev->dev->priv_flags & IFF_NO_ADDRCONF)
744fdc82
JW		 3329 return;
3330
622c81d5 3331 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3332
d35a00b8 3333 switch (idev->cnf.addr_gen_mode) {
cc9da6cc
BM		 3334 case IN6_ADDR_GEN_MODE_RANDOM:
3335 ipv6_gen_mode_random_init(idev);
a8eceea8 3336 fallthrough;
cc9da6cc 3337 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3338 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3339 addrconf_add_linklocal(idev, &addr,
3340 IFA_F_STABLE_PRIVACY);
622c81d5 3341 else if (prefix_route)
8308f3ff 3342 addrconf_prefix_route(&addr, 64, 0, idev->dev,
acb54e3c 3343 0, 0, GFP_KERNEL);
cc9da6cc
BM		 3344 break;
3345 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3346 /* addrconf_add_linklocal also adds a prefix_route and we
3347 * only need to care about prefix routes if ipv6_generate_eui64
3348 * couldn't generate one.
3349 */
3350 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3351 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0 3352 else if (prefix_route)
8308f3ff 3353 addrconf_prefix_route(&addr, 64, 0, idev->dev,
27b10608 3354 0, 0, GFP_KERNEL);
cc9da6cc
BM		 3355 break;
3356 case IN6_ADDR_GEN_MODE_NONE:
3357 default:
3358 /* will not add any link local address */
3359 break;
bc91b0f0
JP		 3360 }
3361}
3362
1da177e4
LT		 3363static void addrconf_dev_config(struct net_device *dev)
3364{
8e5e8f30 3365 struct inet6_dev *idev;
1da177e4
LT		 3366
3367 ASSERT_RTNL();
3368
74235a25
HX		 3369 if ((dev->type != ARPHRD_ETHER) &&
3370 (dev->type != ARPHRD_FDDI) &&
74235a25 3371 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3372 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3373 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3374 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc 3375 (dev->type != ARPHRD_6LOWPAN) &&
45ce0fd1 3376 (dev->type != ARPHRD_TUNNEL) &&
9deb441c
SAK		 3377 (dev->type != ARPHRD_NONE) &&
3378 (dev->type != ARPHRD_RAWIP)) {
74235a25 3379 /* Alas, we support only Ethernet autoconfiguration. */
60380488
HL		 3380 idev = __in6_dev_get(dev);
3381 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3382 dev->flags & IFF_MULTICAST)
3383 ipv6_mc_up(idev);
74235a25
HX		 3384 return;
3385 }
3386
1da177e4 3387 idev = addrconf_add_dev(dev);
64e724f6 3388 if (IS_ERR(idev))
1da177e4
LT		 3389 return;
3390
cc9da6cc
BM		 3391 /* this device type has no EUI support */
3392 if (dev->type == ARPHRD_NONE &&
d35a00b8
FJ		 3393 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3394 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc 3395
bc91b0f0 3396 addrconf_addr_gen(idev, false);
1da177e4
LT		 3397}
3398
07a93626 3399#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3400static void addrconf_sit_config(struct net_device *dev)
3401{
3402 struct inet6_dev *idev;
3403
3404 ASSERT_RTNL();
3405
1ab1457c
YH		 3406 /*
3407 * Configure the tunnel with one of our IPv4
3408 * addresses... we should configure all of
1da177e4
LT		 3409 * our v4 addrs in the tunnel
3410 */
3411
e5d08d71 3412 idev = ipv6_find_idev(dev);
db0b99f5 3413 if (IS_ERR(idev)) {
91df42be 3414 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3415 return;
3416 }
3417
c7dc89c0 3418 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3419 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3420 return;
3421 }
3422
e5dd7294 3423 add_v4_addrs(idev);
1da177e4 3424
62b54dd9 3425 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3426 addrconf_add_mroute(dev);
1da177e4 3427}
0be669bb 3428#endif
1da177e4 3429
e5dd7294 3430#if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
aee80b54 3431static void addrconf_gre_config(struct net_device *dev)
3432{
3433 struct inet6_dev *idev;
aee80b54 3434
aee80b54 3435 ASSERT_RTNL();
3436
e5d08d71 3437 idev = ipv6_find_idev(dev);
db0b99f5 3438 if (IS_ERR(idev)) {
91df42be 3439 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3440 return;
3441 }
3442
e5dd7294
AQ		 3443 if (dev->type == ARPHRD_ETHER) {
3444 addrconf_addr_gen(idev, true);
3445 return;
3446 }
3447
3448 add_v4_addrs(idev);
3449
d9e4ce65
HFS		 3450 if (dev->flags & IFF_POINTOPOINT)
3451 addrconf_add_mroute(dev);
aee80b54 3452}
3453#endif
3454
23ca0c2c
TW		 3455static void addrconf_init_auto_addrs(struct net_device *dev)
3456{
3457 switch (dev->type) {
3458#if IS_ENABLED(CONFIG_IPV6_SIT)
3459 case ARPHRD_SIT:
3460 addrconf_sit_config(dev);
3461 break;
3462#endif
3463#if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3464 case ARPHRD_IP6GRE:
3465 case ARPHRD_IPGRE:
3466 addrconf_gre_config(dev);
3467 break;
3468#endif
3469 case ARPHRD_LOOPBACK:
3470 init_loopback(dev);
3471 break;
3472
3473 default:
3474 addrconf_dev_config(dev);
3475 break;
3476 }
3477}
3478
afb1d4b5
DA		 3479static int fixup_permanent_addr(struct net *net,
3480 struct inet6_dev *idev,
f1705ec1
DA		 3481 struct inet6_ifaddr *ifp)
3482{
93c2fb25 3483 /* !fib6_node means the host route was removed from the
8048ced9
DA		 3484 * FIB, for example, if 'lo' device is taken down. In that
3485 * case regenerate the host route.
3486 */
93c2fb25 3487 if (!ifp->rt || !ifp->rt->fib6_node) {
360a9887 3488 struct fib6_info *f6i, *prev;
f1705ec1 3489
360a9887
DA		 3490 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3491 GFP_ATOMIC);
3492 if (IS_ERR(f6i))
3493 return PTR_ERR(f6i);
f1705ec1 3494
8048ced9
DA		 3495 /* ifp->rt can be accessed outside of rtnl */
3496 spin_lock(&ifp->lock);
3497 prev = ifp->rt;
360a9887 3498 ifp->rt = f6i;
8048ced9
DA		 3499 spin_unlock(&ifp->lock);
3500
93531c67 3501 fib6_info_release(prev);
f1705ec1
DA		 3502 }
3503
3504 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3505 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
8308f3ff
DA		 3506 ifp->rt_priority, idev->dev, 0, 0,
3507 GFP_ATOMIC);
f1705ec1
DA		 3508 }
3509
6d717134
DA		 3510 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3511 addrconf_dad_start(ifp);
f1705ec1
DA		 3512
3513 return 0;
3514}
3515
afb1d4b5 3516static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
f1705ec1
DA		 3517{
3518 struct inet6_ifaddr *ifp, *tmp;
3519 struct inet6_dev *idev;
3520
3521 idev = __in6_dev_get(dev);
3522 if (!idev)
3523 return;
3524
3525 write_lock_bh(&idev->lock);
3526
3527 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3528 if ((ifp->flags & IFA_F_PERMANENT) &&
afb1d4b5 3529 fixup_permanent_addr(net, idev, ifp) < 0) {
f1705ec1 3530 write_unlock_bh(&idev->lock);
e669b869 3531 in6_ifa_hold(ifp);
f1705ec1
DA		 3532 ipv6_del_addr(ifp);
3533 write_lock_bh(&idev->lock);
3534
3535 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3536 idev->dev->name, &ifp->addr);
3537 }
3538 }
3539
3540 write_unlock_bh(&idev->lock);
3541}
3542
1ab1457c 3543static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3544 void *ptr)
1da177e4 3545{
351638e7 3546 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
896585d4 3547 struct netdev_notifier_change_info *change_info;
4f7f34ea 3548 struct netdev_notifier_changeupper_info *info;
748e2d93 3549 struct inet6_dev *idev = __in6_dev_get(dev);
60abc0be 3550 struct net *net = dev_net(dev);
c5e33bdd 3551 int run_pending = 0;
b217d616 3552 int err;
1da177e4 3553
e21e8467 3554 switch (event) {
45ba9dd2 3555 case NETDEV_REGISTER:
74235a25 3556 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3557 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3558 if (IS_ERR(idev))
3559 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3560 }
3561 break;
bcdd553f 3562
b7b0b1d2
AD		 3563 case NETDEV_CHANGEMTU:
3564 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3565 if (dev->mtu < IPV6_MIN_MTU) {
60abc0be 3566 addrconf_ifdown(dev, dev != net->loopback_dev);
b7b0b1d2
AD		 3567 break;
3568 }
3569
3570 if (idev) {
3571 rt6_mtu_change(dev, dev->mtu);
3572 idev->cnf.mtu6 = dev->mtu;
3573 break;
3574 }
3575
3576 /* allocate new idev */
3577 idev = ipv6_add_dev(dev);
3578 if (IS_ERR(idev))
3579 break;
3580
3581 /* device is still not ready */
3582 if (!(idev->if_flags & IF_READY))
3583 break;
3584
3585 run_pending = 1;
a8eceea8 3586 fallthrough;
1da177e4 3587 case NETDEV_UP:
3c21edbd 3588 case NETDEV_CHANGE:
fd16eb94 3589 if (idev && idev->cnf.disable_ipv6)
c2edacf8
JV		 3590 break;
3591
8a321cf7 3592 if (dev->priv_flags & IFF_NO_ADDRCONF) {
fd16eb94
HL		 3593 if (event == NETDEV_UP && !IS_ERR_OR_NULL(idev) &&
3594 dev->flags & IFF_UP && dev->flags & IFF_MULTICAST)
3595 ipv6_mc_up(idev);
3ce62a84 3596 break;
fd16eb94 3597 }
3ce62a84 3598
3c21edbd 3599 if (event == NETDEV_UP) {
38bd10c4 3600 /* restore routes for permanent addresses */
afb1d4b5 3601 addrconf_permanent_addr(net, dev);
38bd10c4 3602
1f372c7b 3603 if (!addrconf_link_ready(dev)) {
3c21edbd 3604 /* device is not ready yet. */
7c62b8dd
LR		 3605 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3606 dev->name);
3c21edbd
YH		 3607 break;
3608 }
99081049 3609
d31c7b8f
EP		 3610 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3611 idev = ipv6_add_dev(dev);
3612
a317a2f1 3613 if (!IS_ERR_OR_NULL(idev)) {
99081049 3614 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3615 run_pending = 1;
3616 }
b7b0b1d2 3617 } else if (event == NETDEV_CHANGE) {
1f372c7b 3618 if (!addrconf_link_ready(dev)) {
3c21edbd 3619 /* device is still not ready. */
27c6fa73 3620 rt6_sync_down_dev(dev, event);
3c21edbd
YH		 3621 break;
3622 }
3623
896585d4 3624 if (!IS_ERR_OR_NULL(idev)) {
a088d1d7
LL		 3625 if (idev->if_flags & IF_READY) {
3626 /* device is already configured -
3627 * but resend MLD reports, we might
3628 * have roamed and need to update
3629 * multicast snooping switches
3630 */
3631 ipv6_mc_up(idev);
896585d4
HL		 3632 change_info = ptr;
3633 if (change_info->flags_changed & IFF_NOARP)
3634 addrconf_dad_run(idev, true);
27c6fa73 3635 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3c21edbd 3636 break;
a088d1d7 3637 }
3c21edbd
YH		 3638 idev->if_flags |= IF_READY;
3639 }
3640
f69de8aa
MB		 3641 pr_debug("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3642 dev->name);
3c21edbd 3643
c5e33bdd 3644 run_pending = 1;
3c21edbd
YH		 3645 }
3646
23ca0c2c 3647 addrconf_init_auto_addrs(dev);
bcdd553f 3648
a317a2f1 3649 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd 3650 if (run_pending)
896585d4 3651 addrconf_dad_run(idev, false);
c5e33bdd 3652
2127d95a
IS		 3653 /* Device has an address by now */
3654 rt6_sync_up(dev, RTNH_F_DEAD);
3655
bcdd553f
SH		 3656 /*
3657 * If the MTU changed during the interface down,
3658 * when the interface up, the changed MTU must be
3659 * reflected in the idev as well as routers.
1da177e4 3660 */
bcdd553f
SH		 3661 if (idev->cnf.mtu6 != dev->mtu &&
3662 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3663 rt6_mtu_change(dev, dev->mtu);
3664 idev->cnf.mtu6 = dev->mtu;
3665 }
3666 idev->tstamp = jiffies;
3667 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3668
3669 /*
3670 * If the changed mtu during down is lower than
3671 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3672 */
3673 if (dev->mtu < IPV6_MIN_MTU)
60abc0be 3674 addrconf_ifdown(dev, dev != net->loopback_dev);
1da177e4
LT		 3675 }
3676 break;
3677
1da177e4
LT		 3678 case NETDEV_DOWN:
3679 case NETDEV_UNREGISTER:
3680 /*
3681 * Remove all addresses from this interface.
3682 */
3683 addrconf_ifdown(dev, event != NETDEV_DOWN);
3684 break;
3c21edbd 3685
1da177e4 3686 case NETDEV_CHANGENAME:
1da177e4 3687 if (idev) {
5632c515 3688 snmp6_unregister_dev(idev);
408c4768 3689 addrconf_sysctl_unregister(idev);
a317a2f1 3690 err = addrconf_sysctl_register(idev);
b217d616
HX		 3691 if (err)
3692 return notifier_from_errno(err);
a317a2f1
WC		 3693 err = snmp6_register_dev(idev);
3694 if (err) {
3695 addrconf_sysctl_unregister(idev);
3696 return notifier_from_errno(err);
3697 }
5632c515 3698 }
1da177e4 3699 break;
bcdd553f 3700
93d9b7d7
JP		 3701 case NETDEV_PRE_TYPE_CHANGE:
3702 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3703 if (idev)
3704 addrconf_type_change(dev, event);
75c78500 3705 break;
4f7f34ea
DA		 3706
3707 case NETDEV_CHANGEUPPER:
3708 info = ptr;
3709
3710 /* flush all routes if dev is linked to or unlinked from
3711 * an L3 master device (e.g., VRF)
3712 */
3713 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
ae79dbf6 3714 addrconf_ifdown(dev, false);
3ff50b79 3715 }
1da177e4
LT		 3716
3717 return NOTIFY_OK;
3718}
3719
3720/*
3721 * addrconf module should be notified of a device going up
3722 */
3723static struct notifier_block ipv6_dev_notf = {
3724 .notifier_call = addrconf_notify,
242d3a49 3725 .priority = ADDRCONF_NOTIFY_PRIORITY,
1da177e4
LT		 3726};
3727
93d9b7d7 3728static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3729{
3730 struct inet6_dev *idev;
3731 ASSERT_RTNL();
3732
3733 idev = __in6_dev_get(dev);
3734
93d9b7d7 3735 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3736 ipv6_mc_remap(idev);
93d9b7d7 3737 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3738 ipv6_mc_unmap(idev);
3739}
3740
70af921d
DA		 3741static bool addr_is_local(const struct in6_addr *addr)
3742{
3743 return ipv6_addr_type(addr) &
3744 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3745}
3746
ae79dbf6 3747static int addrconf_ifdown(struct net_device *dev, bool unregister)
1da177e4 3748{
ae79dbf6 3749 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
c346dca1 3750 struct net *net = dev_net(dev);
502a2ffd 3751 struct inet6_dev *idev;
51454ea4
ND		 3752 struct inet6_ifaddr *ifa;
3753 LIST_HEAD(tmp_addr_list);
0aef78aa 3754 bool keep_addr = false;
9995b408 3755 bool was_ready;
73a8bd74 3756 int state, i;
1da177e4
LT		 3757
3758 ASSERT_RTNL();
3759
4c981e28 3760 rt6_disable_ip(dev, event);
1da177e4
LT		 3761
3762 idev = __in6_dev_get(dev);
63159f29 3763 if (!idev)
1da177e4
LT		 3764 return -ENODEV;
3765
bcdd553f
SH		 3766 /*
3767 * Step 1: remove reference to ipv6 device from parent device.
3768 * Do not dev_put!
1da177e4 3769 */
ae79dbf6 3770 if (unregister) {
1da177e4 3771 idev->dead = 1;
8814c4b5
YH		 3772
3773 /* protected by rtnl_lock */
a9b3cd7f 3774 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3775
3776 /* Step 1.5: remove snmp6 entry */
3777 snmp6_unregister_dev(idev);
3778
3779 }
3780
f1705ec1
DA		 3781 /* combine the user config with event to determine if permanent
3782 * addresses are to be removed from address hash table
3783 */
ae79dbf6 3784 if (!unregister && !idev->cnf.disable_ipv6) {
0aef78aa
IV		 3785 /* aggregate the system setting and interface setting */
3786 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3787
3788 if (!_keep_addr)
3789 _keep_addr = idev->cnf.keep_addr_on_down;
3790
3791 keep_addr = (_keep_addr > 0);
3792 }
f1705ec1 3793
73a8bd74
DM		 3794 /* Step 2: clear hash table */
3795 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
e66d1172 3796 struct hlist_head *h = &net->ipv6.inet6_addr_lst[i];
73a8bd74 3797
e66d1172 3798 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
67ba4152 3799restart:
b67bfe0d 3800 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3801 if (ifa->idev == idev) {
c15b1cca 3802 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3803 /* combined flag + permanent flag decide if
3804 * address is retained on a down event
3805 */
3806 if (!keep_addr ||
70af921d
DA		 3807 !(ifa->flags & IFA_F_PERMANENT) ||
3808 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3809 hlist_del_init_rcu(&ifa->addr_lst);
3810 goto restart;
3811 }
73a8bd74
DM		 3812 }
3813 }
e66d1172 3814 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
73a8bd74
DM		 3815 }
3816
1da177e4
LT		 3817 write_lock_bh(&idev->lock);
3818
b7b1bfce
HFS		 3819 addrconf_del_rs_timer(idev);
3820
9995b408 3821 /* Step 2: clear flags for stateless addrconf, repeated down
3822 * detection
3823 */
3824 was_ready = idev->if_flags & IF_READY;
ae79dbf6 3825 if (!unregister)
3c21edbd 3826 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3827
bcdd553f 3828 /* Step 3: clear tempaddr list */
372e6c8f 3829 while (!list_empty(&idev->tempaddr_list)) {
3830 ifa = list_first_entry(&idev->tempaddr_list,
3831 struct inet6_ifaddr, tmp_list);
3832 list_del(&ifa->tmp_list);
1da177e4
LT		 3833 write_unlock_bh(&idev->lock);
3834 spin_lock_bh(&ifa->lock);
3835
3836 if (ifa->ifpub) {
3837 in6_ifa_put(ifa->ifpub);
3838 ifa->ifpub = NULL;
3839 }
3840 spin_unlock_bh(&ifa->lock);
3841 in6_ifa_put(ifa);
3842 write_lock_bh(&idev->lock);
3843 }
8f37ada5 3844
51454ea4
ND		 3845 list_for_each_entry(ifa, &idev->addr_list, if_list)
3846 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
3847 write_unlock_bh(&idev->lock);
3848
3849 while (!list_empty(&tmp_addr_list)) {
8d1c802b 3850 struct fib6_info *rt = NULL;
a2d6cbb0 3851 bool keep;
38bd10c4 3852
51454ea4
ND		 3853 ifa = list_first_entry(&tmp_addr_list,
3854 struct inet6_ifaddr, if_list_aux);
3855 list_del(&ifa->if_list_aux);
3856
f1705ec1 3857 addrconf_del_dad_work(ifa);
84e8b803 3858
a2d6cbb0
RV		 3859 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3860 !addr_is_local(&ifa->addr);
a2d6cbb0 3861
8e8e676d 3862 spin_lock_bh(&ifa->lock);
f1705ec1 3863
a2d6cbb0 3864 if (keep) {
f1705ec1
DA		 3865 /* set state to skip the notifier below */
3866 state = INET6_IFADDR_STATE_DEAD;
6d717134 3867 ifa->state = INET6_IFADDR_STATE_PREDAD;
f1705ec1
DA		 3868 if (!(ifa->flags & IFA_F_NODAD))
3869 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3870
3871 rt = ifa->rt;
3872 ifa->rt = NULL;
f1705ec1
DA		 3873 } else {
3874 state = ifa->state;
3875 ifa->state = INET6_IFADDR_STATE_DEAD;
f1705ec1
DA		 3876 }
3877
8e8e676d 3878 spin_unlock_bh(&ifa->lock);
9d82ca98 3879
38bd10c4 3880 if (rt)
11dd74b3 3881 ip6_del_rt(net, rt, false);
38bd10c4 3882
73a8bd74
DM		 3883 if (state != INET6_IFADDR_STATE_DEAD) {
3884 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3885 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
ea06f717
MM		 3886 } else {
3887 if (idev->cnf.forwarding)
3888 addrconf_leave_anycast(ifa);
3889 addrconf_leave_solict(ifa->idev, &ifa->addr);
27bdb2ab 3890 }
8f37ada5 3891
8ef802aa 3892 if (!keep) {
51454ea4 3893 write_lock_bh(&idev->lock);
8ef802aa 3894 list_del_rcu(&ifa->if_list);
51454ea4 3895 write_unlock_bh(&idev->lock);
8ef802aa
ED		 3896 in6_ifa_put(ifa);
3897 }
73a8bd74 3898 }
8f37ada5 3899
381f4dca 3900 /* Step 5: Discard anycast and multicast list */
ae79dbf6 3901 if (unregister) {
381f4dca 3902 ipv6_ac_destroy_dev(idev);
1da177e4 3903 ipv6_mc_destroy_dev(idev);
9995b408 3904 } else if (was_ready) {
1da177e4 3905 ipv6_mc_down(idev);
381f4dca 3906 }
1da177e4 3907
1da177e4 3908 idev->tstamp = jiffies;
49b99da2 3909 idev->ra_mtu = 0;
1ab1457c 3910
bcdd553f 3911 /* Last: Shot the device (if unregistered) */
ae79dbf6 3912 if (unregister) {
408c4768 3913 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3914 neigh_parms_release(&nd_tbl, idev->nd_parms);
3915 neigh_ifdown(&nd_tbl, dev);
3916 in6_dev_put(idev);
3917 }
3918 return 0;
3919}
3920
e99e88a9 3921static void addrconf_rs_timer(struct timer_list *t)
1da177e4 3922{
e99e88a9 3923 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
caf92bc4 3924 struct net_device *dev = idev->dev;
b7b1bfce 3925 struct in6_addr lladdr;
1da177e4 3926
b7b1bfce 3927 write_lock(&idev->lock);
5b2a1953 3928 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3929 goto out;
3930
9ba2add3 3931 if (!ipv6_accept_ra(idev))
5b2a1953 3932 goto out;
3933
3934 /* Announcement received after solicitation was sent */
3935 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3936 goto out;
1da177e4 3937
bd11f074 3938 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
caf92bc4
CW		 3939 write_unlock(&idev->lock);
3940 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3941 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3942 &in6addr_linklocal_allrouters);
3943 else
caf92bc4 3944 goto put;
1da177e4 3945
caf92bc4 3946 write_lock(&idev->lock);
bd11f074
MŻ		 3947 idev->rs_interval = rfc3315_s14_backoff_update(
3948 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
b7b1bfce
HFS		 3949 /* The wait after the last probe can be shorter */
3950 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3951 idev->cnf.rtr_solicits) ?
3952 idev->cnf.rtr_solicit_delay :
bd11f074 3953 idev->rs_interval);
1da177e4 3954 } else {
1da177e4
LT		 3955 /*
3956 * Note: we do not support deprecated "all on-link"
3957 * assumption any longer.
3958 */
91df42be 3959 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3960 }
3961
3962out:
b7b1bfce 3963 write_unlock(&idev->lock);
caf92bc4 3964put:
b7b1bfce 3965 in6_dev_put(idev);
1da177e4
LT		 3966}
3967
3968/*
3969 * Duplicate Address Detection
3970 */
3c21edbd
YH		 3971static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3972{
3973 unsigned long rand_num;
3974 struct inet6_dev *idev = ifp->idev;
adc176c5 3975 u64 nonce;
3c21edbd 3976
95c385b4
NH		 3977 if (ifp->flags & IFA_F_OPTIMISTIC)
3978 rand_num = 0;
3979 else
8032bf12 3980 rand_num = get_random_u32_below(idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3981
adc176c5
EN		 3982 nonce = 0;
3983 if (idev->cnf.enhanced_dad ||
3984 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3985 do
3986 get_random_bytes(&nonce, 6);
3987 while (nonce == 0);
3988 }
3989 ifp->dad_nonce = nonce;
b7b1bfce 3990 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3991 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3992}
3993
c15b1cca 3994static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3995{
3996 struct inet6_dev *idev = ifp->idev;
3997 struct net_device *dev = idev->dev;
764d3be6 3998 bool bump_id, notify = false;
afb1d4b5 3999 struct net *net;
1da177e4
LT		 4000
4001 addrconf_join_solict(dev, &ifp->addr);
4002
1da177e4 4003 read_lock_bh(&idev->lock);
622ccdf1 4004 spin_lock(&ifp->lock);
e9d3e084 4005 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 4006 goto out;
1da177e4 4007
afb1d4b5 4008 net = dev_net(dev);
1da177e4 4009 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
afb1d4b5 4010 (net->ipv6.devconf_all->accept_dad < 1 &&
a2d3f3e3 4011 idev->cnf.accept_dad < 1) ||
55ebaef1
NT		 4012 !(ifp->flags&IFA_F_TENTATIVE) ||
4013 ifp->flags & IFA_F_NODAD) {
c76fe2d9
DA		 4014 bool send_na = false;
4015
4016 if (ifp->flags & IFA_F_TENTATIVE &&
4017 !(ifp->flags & IFA_F_OPTIMISTIC))
4018 send_na = true;
764d3be6 4019 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 4020 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 4021 spin_unlock(&ifp->lock);
1da177e4
LT		 4022 read_unlock_bh(&idev->lock);
4023
c76fe2d9 4024 addrconf_dad_completed(ifp, bump_id, send_na);
1da177e4
LT		 4025 return;
4026 }
4027
6732bade 4028 if (!(idev->if_flags & IF_READY)) {
21809faf 4029 spin_unlock(&ifp->lock);
6732bade 4030 read_unlock_bh(&idev->lock);
3c21edbd 4031 /*
590a9887 4032 * If the device is not ready:
3c21edbd
YH		 4033 * - keep it tentative if it is a permanent address.
4034 * - otherwise, kill it.
4035 */
4036 in6_ifa_hold(ifp);
cc411d0b 4037 addrconf_dad_stop(ifp, 0);
6732bade 4038 return;
3c21edbd 4039 }
95c385b4
NH		 4040
4041 /*
4042 * Optimistic nodes can start receiving
4043 * Frames right away
4044 */
7fd2561e 4045 if (ifp->flags & IFA_F_OPTIMISTIC) {
afb1d4b5
DA		 4046 ip6_ins_rt(net, ifp->rt);
4047 if (ipv6_use_optimistic_addr(net, idev)) {
7fd2561e
EK		 4048 /* Because optimistic nodes can use this address,
4049 * notify listeners. If DAD fails, RTM_DELADDR is sent.
4050 */
16186a82 4051 notify = true;
7fd2561e
EK		 4052 }
4053 }
95c385b4 4054
6732bade 4055 addrconf_dad_kick(ifp);
1da177e4 4056out:
622ccdf1 4057 spin_unlock(&ifp->lock);
1da177e4 4058 read_unlock_bh(&idev->lock);
16186a82 4059 if (notify)
4060 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 4061}
4062
c15b1cca 4063static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 4064{
c15b1cca
HFS		 4065 bool begin_dad = false;
4066
8e8e676d 4067 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 4068 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4069 ifp->state = INET6_IFADDR_STATE_PREDAD;
4070 begin_dad = true;
4071 }
8e8e676d 4072 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 4073
4074 if (begin_dad)
4075 addrconf_mod_dad_work(ifp, 0);
4076}
4077
4078static void addrconf_dad_work(struct work_struct *w)
4079{
4080 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4081 struct inet6_ifaddr,
4082 dad_work);
1da177e4 4083 struct inet6_dev *idev = ifp->idev;
764d3be6 4084 bool bump_id, disable_ipv6 = false;
1da177e4
LT		 4085 struct in6_addr mcaddr;
4086
c15b1cca
HFS		 4087 enum {
4088 DAD_PROCESS,
4089 DAD_BEGIN,
4090 DAD_ABORT,
4091 } action = DAD_PROCESS;
4092
4093 rtnl_lock();
4094
8e8e676d 4095 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 4096 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4097 action = DAD_BEGIN;
4098 ifp->state = INET6_IFADDR_STATE_DAD;
4099 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4100 action = DAD_ABORT;
4101 ifp->state = INET6_IFADDR_STATE_POSTDAD;
85b51b12 4102
35e015e1
MC		 4103 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4104 idev->cnf.accept_dad > 1) &&
4105 !idev->cnf.disable_ipv6 &&
85b51b12
MM		 4106 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4107 struct in6_addr addr;
4108
4109 addr.s6_addr32[0] = htonl(0xfe800000);
4110 addr.s6_addr32[1] = 0;
4111
4112 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4113 ipv6_addr_equal(&ifp->addr, &addr)) {
4114 /* DAD failed for link-local based on MAC */
4115 idev->cnf.disable_ipv6 = 1;
4116
4117 pr_info("%s: IPv6 being disabled!\n",
4118 ifp->idev->dev->name);
4119 disable_ipv6 = true;
4120 }
4121 }
c15b1cca 4122 }
8e8e676d 4123 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 4124
4125 if (action == DAD_BEGIN) {
4126 addrconf_dad_begin(ifp);
4127 goto out;
4128 } else if (action == DAD_ABORT) {
751eb6b6 4129 in6_ifa_hold(ifp);
c15b1cca 4130 addrconf_dad_stop(ifp, 1);
85b51b12 4131 if (disable_ipv6)
ae79dbf6 4132 addrconf_ifdown(idev->dev, false);
c15b1cca
HFS		 4133 goto out;
4134 }
4135
b7b1bfce 4136 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 4137 goto out;
4138
c15b1cca 4139 write_lock_bh(&idev->lock);
122e4519 4140 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 4141 write_unlock_bh(&idev->lock);
1da177e4
LT		 4142 goto out;
4143 }
21809faf 4144
4145 spin_lock(&ifp->lock);
622ccdf1
HX		 4146 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4147 spin_unlock(&ifp->lock);
c15b1cca 4148 write_unlock_bh(&idev->lock);
622ccdf1
HX		 4149 goto out;
4150 }
4151
b7b1bfce 4152 if (ifp->dad_probes == 0) {
c76fe2d9
DA		 4153 bool send_na = false;
4154
1da177e4
LT		 4155 /*
4156 * DAD was successful
4157 */
4158
c76fe2d9
DA		 4159 if (ifp->flags & IFA_F_TENTATIVE &&
4160 !(ifp->flags & IFA_F_OPTIMISTIC))
4161 send_na = true;
764d3be6 4162 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 4163 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 4164 spin_unlock(&ifp->lock);
c15b1cca 4165 write_unlock_bh(&idev->lock);
1da177e4 4166
c76fe2d9 4167 addrconf_dad_completed(ifp, bump_id, send_na);
1da177e4
LT		 4168
4169 goto out;
4170 }
4171
b7b1bfce 4172 ifp->dad_probes--;
c15b1cca 4173 addrconf_mod_dad_work(ifp,
19e16d22
HL		 4174 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4175 HZ/100));
21809faf 4176 spin_unlock(&ifp->lock);
c15b1cca 4177 write_unlock_bh(&idev->lock);
1da177e4
LT		 4178
4179 /* send a neighbour solicitation for our addr */
1da177e4 4180 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
adc176c5
EN		 4181 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4182 ifp->dad_nonce);
1da177e4
LT		 4183out:
4184 in6_ifa_put(ifp);
c15b1cca 4185 rtnl_unlock();
1da177e4
LT		 4186}
4187
11ffff75
HFS		 4188/* ifp->idev must be at least read locked */
4189static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4190{
4191 struct inet6_ifaddr *ifpiter;
4192 struct inet6_dev *idev = ifp->idev;
4193
602582ca
HFS		 4194 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4195 if (ifpiter->scope > IFA_LINK)
4196 break;
11ffff75
HFS		 4197 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4198 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4199 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4200 IFA_F_PERMANENT)
4201 return false;
4202 }
4203 return true;
4204}
4205
c76fe2d9
DA		 4206static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4207 bool send_na)
1da177e4 4208{
e21e8467 4209 struct net_device *dev = ifp->idev->dev;
b7b1bfce 4210 struct in6_addr lladdr;
b173ee48 4211 bool send_rs, send_mld;
b7b1bfce 4212
c15b1cca 4213 addrconf_del_dad_work(ifp);
1da177e4
LT		 4214
4215 /*
4216 * Configure the address for reception. Now it is valid.
4217 */
4218
4219 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4220
026359bc
TA		 4221 /* If added prefix is link local and we are prepared to process
4222 router advertisements, start sending router solicitations.
1da177e4
LT		 4223 */
4224
1ec047eb 4225 read_lock_bh(&ifp->idev->lock);
11ffff75 4226 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 4227 send_rs = send_mld &&
4228 ipv6_accept_ra(ifp->idev) &&
bd11f074 4229 ifp->idev->cnf.rtr_solicits != 0 &&
b52e1cce 4230 (dev->flags & IFF_LOOPBACK) == 0 &&
2df9bf4d
XL		 4231 (dev->type != ARPHRD_TUNNEL) &&
4232 !netif_is_team_port(dev);
1ec047eb
HFS		 4233 read_unlock_bh(&ifp->idev->lock);
4234
b173ee48
HFS		 4235 /* While dad is in progress mld report's source address is in6_addrany.
4236 * Resend with proper ll now.
4237 */
4238 if (send_mld)
4239 ipv6_mc_dad_complete(ifp->idev);
4240
c76fe2d9
DA		 4241 /* send unsolicited NA if enabled */
4242 if (send_na &&
4243 (ifp->idev->cnf.ndisc_notify ||
4244 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4245 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4246 /*router=*/ !!ifp->idev->cnf.forwarding,
4247 /*solicited=*/ false, /*override=*/ true,
4248 /*inc_opt=*/ true);
4249 }
4250
1ec047eb 4251 if (send_rs) {
1da177e4
LT		 4252 /*
4253 * If a host as already performed a random delay
4254 * [...] as part of DAD [...] there is no need
4255 * to delay again before sending the first RS
4256 */
1ec047eb 4257 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 4258 return;
1ec047eb 4259 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 4260
b7b1bfce
HFS		 4261 write_lock_bh(&ifp->idev->lock);
4262 spin_lock(&ifp->lock);
bd11f074
MŻ		 4263 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4264 ifp->idev->cnf.rtr_solicit_interval);
b7b1bfce 4265 ifp->idev->rs_probes = 1;
1da177e4 4266 ifp->idev->if_flags |= IF_RS_SENT;
bd11f074 4267 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
b7b1bfce
HFS		 4268 spin_unlock(&ifp->lock);
4269 write_unlock_bh(&ifp->idev->lock);
1da177e4 4270 }
764d3be6
PA		 4271
4272 if (bump_id)
4273 rt_genid_bump_ipv6(dev_net(dev));
a11a7f71
MH		 4274
4275 /* Make sure that a new temporary address will be created
4276 * before this temporary address becomes deprecated.
4277 */
4278 if (ifp->flags & IFA_F_TEMPORARY)
8805d13f 4279 addrconf_verify_rtnl(dev_net(dev));
1da177e4
LT		 4280}
4281
896585d4 4282static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
e21e8467 4283{
c5e33bdd
YH		 4284 struct inet6_ifaddr *ifp;
4285
4286 read_lock_bh(&idev->lock);
502a2ffd 4287 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 4288 spin_lock(&ifp->lock);
896585d4
HL		 4289 if ((ifp->flags & IFA_F_TENTATIVE &&
4290 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4291 if (restart)
4292 ifp->state = INET6_IFADDR_STATE_PREDAD;
f2344a13 4293 addrconf_dad_kick(ifp);
896585d4 4294 }
21809faf 4295 spin_unlock(&ifp->lock);
c5e33bdd
YH		 4296 }
4297 read_unlock_bh(&idev->lock);
4298}
4299
1da177e4
LT		 4300#ifdef CONFIG_PROC_FS
4301struct if6_iter_state {
3c40090a 4302 struct seq_net_private p;
1da177e4 4303 int bucket;
1d578303 4304 int offset;
1da177e4
LT		 4305};
4306
1d578303 4307static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4 4308{
1da177e4 4309 struct if6_iter_state *state = seq->private;
1218854a 4310 struct net *net = seq_file_net(seq);
a5c1d98f 4311 struct inet6_ifaddr *ifa = NULL;
1d578303 4312 int p = 0;
1da177e4 4313
1d578303
MM		 4314 /* initial bucket if pos is 0 */
4315 if (pos == 0) {
4316 state->bucket = 0;
4317 state->offset = 0;
4318 }
4319
4320 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
e66d1172 4321 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket],
1d578303
MM		 4322 addr_lst) {
4323 /* sync with offset */
4324 if (p < state->offset) {
4325 p++;
4326 continue;
4327 }
9f0d3c27 4328 return ifa;
1d578303
MM		 4329 }
4330
4331 /* prepare for next bucket */
4332 state->offset = 0;
4333 p = 0;
1da177e4 4334 }
c2e21293 4335 return NULL;
1da177e4
LT		 4336}
4337
c2e21293 4338static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4339 struct inet6_ifaddr *ifa)
1da177e4
LT		 4340{
4341 struct if6_iter_state *state = seq->private;
1218854a 4342 struct net *net = seq_file_net(seq);
1da177e4 4343
a5c1d98f 4344 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
1d578303 4345 state->offset++;
9f0d3c27 4346 return ifa;
1d578303 4347 }
3c40090a 4348
86f9bd1f 4349 state->offset = 0;
c2e21293 4350 while (++state->bucket < IN6_ADDR_HSIZE) {
a5c1d98f 4351 hlist_for_each_entry_rcu(ifa,
e66d1172 4352 &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27 4353 return ifa;
c2e21293 4354 }
1da177e4 4355 }
3c40090a 4356
c2e21293 4357 return NULL;
1da177e4
LT		 4358}
4359
1da177e4 4360static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
a5c1d98f 4361 __acquires(rcu)
1da177e4 4362{
a5c1d98f 4363 rcu_read_lock();
1d578303 4364 return if6_get_first(seq, *pos);
1da177e4
LT		 4365}
4366
4367static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4368{
4369 struct inet6_ifaddr *ifa;
4370
4371 ifa = if6_get_next(seq, v);
4372 ++*pos;
4373 return ifa;
4374}
4375
4376static void if6_seq_stop(struct seq_file *seq, void *v)
a5c1d98f 4377 __releases(rcu)
1da177e4 4378{
a5c1d98f 4379 rcu_read_unlock();
1da177e4
LT		 4380}
4381
4382static int if6_seq_show(struct seq_file *seq, void *v)
4383{
4384 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4385 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4386 &ifp->addr,
1da177e4
LT		 4387 ifp->idev->dev->ifindex,
4388 ifp->prefix_len,
4389 ifp->scope,
971a351c 4390 (u8) ifp->flags,
1da177e4
LT		 4391 ifp->idev->dev->name);
4392 return 0;
4393}
4394
56b3d975 4395static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4396 .start = if6_seq_start,
4397 .next = if6_seq_next,
4398 .show = if6_seq_show,
4399 .stop = if6_seq_stop,
4400};
4401
2c8c1e72 4402static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4403{
c3506372
CH		 4404 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4405 sizeof(struct if6_iter_state)))
1da177e4
LT		 4406 return -ENOMEM;
4407 return 0;
4408}
4409
2c8c1e72 4410static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4411{
ece31ffd 4412 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4413}
4414
4415static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4416 .init = if6_proc_net_init,
4417 .exit = if6_proc_net_exit,
3c40090a
DL		 4418};
4419
4420int __init if6_proc_init(void)
4421{
4422 return register_pernet_subsys(&if6_proc_net_ops);
4423}
4424
1da177e4
LT		 4425void if6_proc_exit(void)
4426{
3c40090a 4427 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4428}
4429#endif /* CONFIG_PROC_FS */
4430
07a93626 4431#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4432/* Check if address is a home address configured on any interface. */
b71d1d42 4433int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c 4434{
3f27fb23 4435 unsigned int hash = inet6_addr_hash(net, addr);
c2e21293 4436 struct inet6_ifaddr *ifp = NULL;
3f27fb23 4437 int ret = 0;
c2e21293 4438
4e5f47ab 4439 rcu_read_lock();
e66d1172 4440 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
caad295f 4441 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4442 (ifp->flags & IFA_F_HOMEADDRESS)) {
4443 ret = 1;
4444 break;
4445 }
4446 }
4e5f47ab 4447 rcu_read_unlock();
3b9f9a1c
NT		 4448 return ret;
4449}
4450#endif
4451
f37c6059
AA		 4452/* RFC6554 has some algorithm to avoid loops in segment routing by
4453 * checking if the segments contains any of a local interface address.
4454 *
4455 * Quote:
4456 *
4457 * To detect loops in the SRH, a router MUST determine if the SRH
4458 * includes multiple addresses assigned to any interface on that router.
4459 * If such addresses appear more than once and are separated by at least
4460 * one address not assigned to that router.
4461 */
4462int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4463 unsigned char nsegs)
4464{
4465 const struct in6_addr *addr;
4466 int i, ret = 0, found = 0;
4467 struct inet6_ifaddr *ifp;
4468 bool separated = false;
4469 unsigned int hash;
4470 bool hash_found;
4471
4472 rcu_read_lock();
4473 for (i = 0; i < nsegs; i++) {
4474 addr = &segs[i];
4475 hash = inet6_addr_hash(net, addr);
4476
4477 hash_found = false;
e66d1172 4478 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
f37c6059
AA		 4479
4480 if (ipv6_addr_equal(&ifp->addr, addr)) {
4481 hash_found = true;
4482 break;
4483 }
4484 }
4485
4486 if (hash_found) {
4487 if (found > 1 && separated) {
4488 ret = 1;
4489 break;
4490 }
4491
4492 separated = false;
4493 found++;
4494 } else {
4495 separated = true;
4496 }
4497 }
4498 rcu_read_unlock();
4499
4500 return ret;
4501}
4502
1da177e4
LT		 4503/*
4504 * Periodic address status verification
4505 */
4506
8805d13f 4507static void addrconf_verify_rtnl(struct net *net)
1da177e4 4508{
b2db7564 4509 unsigned long now, next, next_sec, next_sched;
1da177e4 4510 struct inet6_ifaddr *ifp;
1da177e4
LT		 4511 int i;
4512
c15b1cca
HFS		 4513 ASSERT_RTNL();
4514
5c578aed 4515 rcu_read_lock_bh();
1da177e4 4516 now = jiffies;
b2db7564 4517 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4518
8805d13f 4519 cancel_delayed_work(&net->ipv6.addr_chk_work);
1da177e4 4520
bcdd553f 4521 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4522restart:
e66d1172 4523 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) {
1da177e4 4524 unsigned long age;
1da177e4 4525
fad8da3e
YA		 4526 /* When setting preferred_lft to a value not zero or
4527 * infinity, while valid_lft is infinity
4528 * IFA_F_PERMANENT has a non-infinity life time.
4529 */
4530 if ((ifp->flags & IFA_F_PERMANENT) &&
4531 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4532 continue;
4533
4534 spin_lock(&ifp->lock);
b2db7564
YH		 4535 /* We try to batch several events at once. */
4536 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4537
778964f2
SE		 4538 if ((ifp->flags&IFA_F_TEMPORARY) &&
4539 !(ifp->flags&IFA_F_TENTATIVE) &&
4540 ifp->prefered_lft != INFINITY_LIFE_TIME &&
4541 !ifp->regen_count && ifp->ifpub) {
4542 /* This is a non-regenerated temporary addr. */
4543
4544 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4545 ifp->idev->cnf.dad_transmits *
4546 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
4547
4548 if (age + regen_advance >= ifp->prefered_lft) {
4549 struct inet6_ifaddr *ifpub = ifp->ifpub;
4550 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4551 next = ifp->tstamp + ifp->prefered_lft * HZ;
4552
4553 ifp->regen_count++;
4554 in6_ifa_hold(ifp);
4555 in6_ifa_hold(ifpub);
4556 spin_unlock(&ifp->lock);
4557
4558 spin_lock(&ifpub->lock);
4559 ifpub->regen_count = 0;
4560 spin_unlock(&ifpub->lock);
4561 rcu_read_unlock_bh();
4562 ipv6_create_tempaddr(ifpub, true);
4563 in6_ifa_put(ifpub);
4564 in6_ifa_put(ifp);
4565 rcu_read_lock_bh();
4566 goto restart;
4567 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4568 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4569 }
4570
8f27ebb9
YH		 4571 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4572 age >= ifp->valid_lft) {
1da177e4
LT		 4573 spin_unlock(&ifp->lock);
4574 in6_ifa_hold(ifp);
aa8caa76 4575 rcu_read_unlock_bh();
1da177e4 4576 ipv6_del_addr(ifp);
aa8caa76 4577 rcu_read_lock_bh();
1da177e4 4578 goto restart;
8f27ebb9
YH		 4579 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4580 spin_unlock(&ifp->lock);
4581 continue;
1da177e4 4582 } else if (age >= ifp->prefered_lft) {
a1ed0526 4583 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4584 int deprecate = 0;
4585
4586 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4587 deprecate = 1;
4588 ifp->flags |= IFA_F_DEPRECATED;
4589 }
4590
fad8da3e
YA		 4591 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4592 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4593 next = ifp->tstamp + ifp->valid_lft * HZ;
4594
4595 spin_unlock(&ifp->lock);
4596
4597 if (deprecate) {
4598 in6_ifa_hold(ifp);
1da177e4
LT		 4599
4600 ipv6_ifa_notify(0, ifp);
4601 in6_ifa_put(ifp);
4602 goto restart;
4603 }
1da177e4
LT		 4604 } else {
4605 /* ifp->prefered_lft <= ifp->valid_lft */
4606 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4607 next = ifp->tstamp + ifp->prefered_lft * HZ;
4608 spin_unlock(&ifp->lock);
4609 }
4610 }
1da177e4
LT		 4611 }
4612
b2db7564
YH		 4613 next_sec = round_jiffies_up(next);
4614 next_sched = next;
4615
4616 /* If rounded timeout is accurate enough, accept it. */
4617 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4618 next_sched = next_sec;
4619
4620 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4621 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4622 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4623
e32ac250
JP		 4624 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4625 now, next, next_sec, next_sched);
8805d13f 4626 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now);
5c578aed 4627 rcu_read_unlock_bh();
1da177e4
LT		 4628}
4629
c15b1cca
HFS		 4630static void addrconf_verify_work(struct work_struct *w)
4631{
8805d13f
ED		 4632 struct net *net = container_of(to_delayed_work(w), struct net,
4633 ipv6.addr_chk_work);
4634
c15b1cca 4635 rtnl_lock();
8805d13f 4636 addrconf_verify_rtnl(net);
c15b1cca
HFS		 4637 rtnl_unlock();
4638}
4639
8805d13f 4640static void addrconf_verify(struct net *net)
c15b1cca 4641{
8805d13f 4642 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0);
c15b1cca
HFS		 4643}
4644
caeaba79
ND		 4645static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4646 struct in6_addr **peer_pfx)
461d8837
TG		 4647{
4648 struct in6_addr *pfx = NULL;
4649
caeaba79
ND		 4650 *peer_pfx = NULL;
4651
461d8837
TG		 4652 if (addr)
4653 pfx = nla_data(addr);
4654
4655 if (local) {
4656 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4657 *peer_pfx = pfx;
4658 pfx = nla_data(local);
461d8837
TG		 4659 }
4660
4661 return pfx;
4662}
4663
ef7c79ed 4664static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4665 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4666 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4667 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4668 [IFA_FLAGS] = { .len = sizeof(u32) },
8308f3ff 4669 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
6ecf4c37 4670 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
47f0bd50 4671 [IFA_PROTO] = { .type = NLA_U8 },
461d8837
TG		 4672};
4673
1da177e4 4674static int
c21ef3e3
DA		 4675inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4676 struct netlink_ext_ack *extack)
1da177e4 4677{
3b1e0a65 4678 struct net *net = sock_net(skb->sk);
b933f716
TG		 4679 struct ifaddrmsg *ifm;
4680 struct nlattr *tb[IFA_MAX+1];
caeaba79 4681 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4682 u32 ifa_flags;
b933f716 4683 int err;
1da177e4 4684
8cb08174
JB		 4685 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4686 ifa_ipv6_policy, extack);
b933f716
TG		 4687 if (err < 0)
4688 return err;
4689
4690 ifm = nlmsg_data(nlh);
caeaba79 4691 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4692 if (!pfx)
1da177e4
LT		 4693 return -EINVAL;
4694
6046d5b4
HK		 4695 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4696
4697 /* We ignore other flags so far. */
4698 ifa_flags &= IFA_F_MANAGETEMPADDR;
4699
4700 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4701 ifm->ifa_prefixlen);
1da177e4
LT		 4702}
4703
8308f3ff 4704static int modify_prefix_route(struct inet6_ifaddr *ifp,
61794012
HL		 4705 unsigned long expires, u32 flags,
4706 bool modify_peer)
8308f3ff
DA		 4707{
4708 struct fib6_info *f6i;
e7c7faa9 4709 u32 prio;
8308f3ff 4710
61794012
HL		 4711 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4712 ifp->prefix_len,
2b2450ca 4713 ifp->idev->dev, 0, RTF_DEFAULT, true);
8308f3ff
DA		 4714 if (!f6i)
4715 return -ENOENT;
4716
e7c7faa9
DA		 4717 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4718 if (f6i->fib6_metric != prio) {
4719 /* delete old one */
11dd74b3 4720 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
e7c7faa9 4721
8308f3ff 4722 /* add new one */
61794012
HL		 4723 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4724 ifp->prefix_len,
8308f3ff
DA		 4725 ifp->rt_priority, ifp->idev->dev,
4726 expires, flags, GFP_KERNEL);
8308f3ff
DA		 4727 } else {
4728 if (!expires)
4729 fib6_clean_expires(f6i);
4730 else
4731 fib6_set_expires(f6i, expires);
4732
4733 fib6_info_release(f6i);
4734 }
4735
4736 return 0;
4737}
4738
8805d13f
ED		 4739static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp,
4740 struct ifa6_config *cfg)
081bba5b 4741{
6f704992
YH		 4742 u32 flags;
4743 clock_t expires;
4bed72e4 4744 unsigned long timeout;
53bd6749 4745 bool was_managetempaddr;
5b84efec 4746 bool had_prefixroute;
d0098e4c 4747 bool new_peer = false;
46d48046 4748
c15b1cca
HFS		 4749 ASSERT_RTNL();
4750
d169a1f8 4751 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
081bba5b
NT		 4752 return -EINVAL;
4753
d169a1f8 4754 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
53bd6749
JP		 4755 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4756 return -EINVAL;
4757
f1c02cfb 4758 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
d169a1f8 4759 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
f1c02cfb 4760
d169a1f8 4761 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4bed72e4
YH		 4762 if (addrconf_finite_timeout(timeout)) {
4763 expires = jiffies_to_clock_t(timeout * HZ);
d169a1f8 4764 cfg->valid_lft = timeout;
6f704992 4765 flags = RTF_EXPIRES;
4bed72e4
YH		 4766 } else {
4767 expires = 0;
4768 flags = 0;
d169a1f8 4769 cfg->ifa_flags |= IFA_F_PERMANENT;
6f704992 4770 }
081bba5b 4771
d169a1f8 4772 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4bed72e4
YH		 4773 if (addrconf_finite_timeout(timeout)) {
4774 if (timeout == 0)
d169a1f8
DA		 4775 cfg->ifa_flags |= IFA_F_DEPRECATED;
4776 cfg->preferred_lft = timeout;
4bed72e4 4777 }
081bba5b 4778
d0098e4c
HL		 4779 if (cfg->peer_pfx &&
4780 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4781 if (!ipv6_addr_any(&ifp->peer_addr))
4782 cleanup_prefix_route(ifp, expires, true, true);
4783 new_peer = true;
4784 }
4785
081bba5b 4786 spin_lock_bh(&ifp->lock);
53bd6749 4787 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4788 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4789 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4790 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4791 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4792 IFA_F_NOPREFIXROUTE);
d169a1f8 4793 ifp->flags |= cfg->ifa_flags;
081bba5b 4794 ifp->tstamp = jiffies;
d169a1f8
DA		 4795 ifp->valid_lft = cfg->valid_lft;
4796 ifp->prefered_lft = cfg->preferred_lft;
47f0bd50 4797 ifp->ifa_proto = cfg->ifa_proto;
081bba5b 4798
8308f3ff
DA		 4799 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4800 ifp->rt_priority = cfg->rt_priority;
081bba5b 4801
d0098e4c
HL		 4802 if (new_peer)
4803 ifp->peer_addr = *cfg->peer_pfx;
4804
081bba5b
NT		 4805 spin_unlock_bh(&ifp->lock);
4806 if (!(ifp->flags&IFA_F_TENTATIVE))
4807 ipv6_ifa_notify(0, ifp);
081bba5b 4808
d169a1f8 4809 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
8308f3ff
DA		 4810 int rc = -ENOENT;
4811
4812 if (had_prefixroute)
61794012 4813 rc = modify_prefix_route(ifp, expires, flags, false);
8308f3ff
DA		 4814
4815 /* prefix route could have been deleted; if so restore it */
4816 if (rc == -ENOENT) {
4817 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4818 ifp->rt_priority, ifp->idev->dev,
4819 expires, flags, GFP_KERNEL);
4820 }
61794012
HL		 4821
4822 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4823 rc = modify_prefix_route(ifp, expires, flags, true);
4824
4825 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4826 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4827 ifp->rt_priority, ifp->idev->dev,
4828 expires, flags, GFP_KERNEL);
4829 }
5b84efec
TH		 4830 } else if (had_prefixroute) {
4831 enum cleanup_prefix_rt_t action;
4832 unsigned long rt_expires;
4833
4834 write_lock_bh(&ifp->idev->lock);
4835 action = check_cleanup_prefix_route(ifp, &rt_expires);
4836 write_unlock_bh(&ifp->idev->lock);
4837
4838 if (action != CLEANUP_PREFIX_RT_NOP) {
4839 cleanup_prefix_route(ifp, rt_expires,
d0098e4c 4840 action == CLEANUP_PREFIX_RT_DEL, false);
5b84efec 4841 }
761aac73 4842 }
53bd6749
JP		 4843
4844 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
d169a1f8
DA		 4845 if (was_managetempaddr &&
4846 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4847 cfg->valid_lft = 0;
4848 cfg->preferred_lft = 0;
4849 }
4850 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4851 cfg->preferred_lft, !was_managetempaddr,
4852 jiffies);
53bd6749
JP		 4853 }
4854
8805d13f 4855 addrconf_verify_rtnl(net);
081bba5b
NT		 4856
4857 return 0;
4858}
4859
1da177e4 4860static int
c21ef3e3
DA		 4861inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4862 struct netlink_ext_ack *extack)
1da177e4 4863{
3b1e0a65 4864 struct net *net = sock_net(skb->sk);
461d8837
TG		 4865 struct ifaddrmsg *ifm;
4866 struct nlattr *tb[IFA_MAX+1];
19b1518c 4867 struct in6_addr *peer_pfx;
7198f8ce
TG		 4868 struct inet6_ifaddr *ifa;
4869 struct net_device *dev;
f1c02cfb 4870 struct inet6_dev *idev;
19b1518c 4871 struct ifa6_config cfg;
461d8837 4872 int err;
1da177e4 4873
8cb08174
JB		 4874 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4875 ifa_ipv6_policy, extack);
461d8837
TG		 4876 if (err < 0)
4877 return err;
4878
19b1518c
DA		 4879 memset(&cfg, 0, sizeof(cfg));
4880
461d8837 4881 ifm = nlmsg_data(nlh);
19b1518c
DA		 4882 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4883 if (!cfg.pfx)
1da177e4
LT		 4884 return -EINVAL;
4885
19b1518c
DA		 4886 cfg.peer_pfx = peer_pfx;
4887 cfg.plen = ifm->ifa_prefixlen;
8308f3ff
DA		 4888 if (tb[IFA_RT_PRIORITY])
4889 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4890
47f0bd50
JL		 4891 if (tb[IFA_PROTO])
4892 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]);
4893
19b1518c
DA		 4894 cfg.valid_lft = INFINITY_LIFE_TIME;
4895 cfg.preferred_lft = INFINITY_LIFE_TIME;
4896
461d8837 4897 if (tb[IFA_CACHEINFO]) {
0778769d 4898 struct ifa_cacheinfo *ci;
461d8837
TG		 4899
4900 ci = nla_data(tb[IFA_CACHEINFO]);
19b1518c
DA		 4901 cfg.valid_lft = ci->ifa_valid;
4902 cfg.preferred_lft = ci->ifa_prefered;
0778769d
NT		 4903 }
4904
af284937 4905 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4906 if (!dev)
7198f8ce
TG		 4907 return -ENODEV;
4908
19b1518c
DA		 4909 if (tb[IFA_FLAGS])
4910 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4911 else
4912 cfg.ifa_flags = ifm->ifa_flags;
479840ff 4913
55ebaef1 4914 /* We ignore other flags so far. */
19b1518c
DA		 4915 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4916 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4917 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
f1c02cfb
SD		 4918
4919 idev = ipv6_find_idev(dev);
db0b99f5
SD		 4920 if (IS_ERR(idev))
4921 return PTR_ERR(idev);
f1c02cfb
SD		 4922
4923 if (!ipv6_allow_optimistic_dad(net, idev))
19b1518c 4924 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
f1c02cfb 4925
19b1518c
DA		 4926 if (cfg.ifa_flags & IFA_F_NODAD &&
4927 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
f1c02cfb
SD		 4928 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4929 return -EINVAL;
4930 }
55ebaef1 4931
19b1518c 4932 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
63159f29 4933 if (!ifa) {
7198f8ce
TG		 4934 /*
4935 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4936 * userspace already relies on not having to provide this.
7198f8ce 4937 */
19b1518c 4938 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
081bba5b
NT		 4939 }
4940
7198f8ce
TG		 4941 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4942 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4943 err = -EEXIST;
4944 else
8805d13f 4945 err = inet6_addr_modify(net, ifa, &cfg);
7198f8ce
TG		 4946
4947 in6_ifa_put(ifa);
4948
4949 return err;
1da177e4
LT		 4950}
4951
479840ff 4952static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4953 u8 scope, int ifindex)
4954{
4955 struct ifaddrmsg *ifm;
4956
4957 ifm = nlmsg_data(nlh);
4958 ifm->ifa_family = AF_INET6;
4959 ifm->ifa_prefixlen = prefixlen;
4960 ifm->ifa_flags = flags;
4961 ifm->ifa_scope = scope;
4962 ifm->ifa_index = ifindex;
4963}
4964
85486af0
TG		 4965static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4966 unsigned long tstamp, u32 preferred, u32 valid)
4967{
4968 struct ifa_cacheinfo ci;
4969
18a31e1e
TG		 4970 ci.cstamp = cstamp_delta(cstamp);
4971 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4972 ci.ifa_prefered = preferred;
4973 ci.ifa_valid = valid;
4974
4975 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4976}
4977
101bb229
TG		 4978static inline int rt_scope(int ifa_scope)
4979{
4980 if (ifa_scope & IFA_HOST)
4981 return RT_SCOPE_HOST;
4982 else if (ifa_scope & IFA_LINK)
4983 return RT_SCOPE_LINK;
4984 else if (ifa_scope & IFA_SITE)
4985 return RT_SCOPE_SITE;
4986 else
4987 return RT_SCOPE_UNIVERSE;
4988}
4989
0ab6803b
TG		 4990static inline int inet6_ifaddr_msgsize(void)
4991{
339bf98f 4992 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4993 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4994 + nla_total_size(16) /* IFA_ADDRESS */
479840ff 4995 + nla_total_size(sizeof(struct ifa_cacheinfo))
8308f3ff 4996 + nla_total_size(4) /* IFA_FLAGS */
47f0bd50 4997 + nla_total_size(1) /* IFA_PROTO */
8308f3ff 4998 + nla_total_size(4) /* IFA_RT_PRIORITY */;
0ab6803b 4999}
c5396a31 5000
6ba1e6e8
DA		 5001enum addr_type_t {
5002 UNICAST_ADDR,
5003 MULTICAST_ADDR,
5004 ANYCAST_ADDR,
5005};
5006
203651b6
CB		 5007struct inet6_fill_args {
5008 u32 portid;
5009 u32 seq;
5010 int event;
5011 unsigned int flags;
5012 int netnsid;
6371a71f 5013 int ifindex;
6ba1e6e8 5014 enum addr_type_t type;
203651b6
CB		 5015};
5016
1da177e4 5017static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
203651b6 5018 struct inet6_fill_args *args)
1da177e4 5019{
1da177e4 5020 struct nlmsghdr *nlh;
85486af0 5021 u32 preferred, valid;
1da177e4 5022
203651b6
CB		 5023 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5024 sizeof(struct ifaddrmsg), args->flags);
63159f29 5025 if (!nlh)
26932566 5026 return -EMSGSIZE;
0ab6803b 5027
101bb229
TG		 5028 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
5029 ifa->idev->dev->ifindex);
5030
203651b6
CB		 5031 if (args->netnsid >= 0 &&
5032 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
6ecf4c37
CB		 5033 goto error;
5034
6c0d8833 5035 spin_lock_bh(&ifa->lock);
fad8da3e
YA		 5036 if (!((ifa->flags&IFA_F_PERMANENT) &&
5037 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 5038 preferred = ifa->prefered_lft;
5039 valid = ifa->valid_lft;
5040 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 5041 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 5042 if (preferred > tval)
5043 preferred -= tval;
5044 else
5045 preferred = 0;
f56619fc
BH		 5046 if (valid != INFINITY_LIFE_TIME) {
5047 if (valid > tval)
5048 valid -= tval;
5049 else
5050 valid = 0;
5051 }
1da177e4
LT		 5052 }
5053 } else {
85486af0
TG		 5054 preferred = INFINITY_LIFE_TIME;
5055 valid = INFINITY_LIFE_TIME;
5056 }
6c0d8833 5057 spin_unlock_bh(&ifa->lock);
85486af0 5058
7996c799 5059 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 5060 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
5061 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 5062 goto error;
5063 } else
930345ea 5064 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 5065 goto error;
5066
8308f3ff
DA		 5067 if (ifa->rt_priority &&
5068 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
5069 goto error;
5070
caeaba79
ND		 5071 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
5072 goto error;
1da177e4 5073
479840ff
JP		 5074 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
5075 goto error;
5076
47f0bd50
JL		 5077 if (ifa->ifa_proto &&
5078 nla_put_u8(skb, IFA_PROTO, ifa->ifa_proto))
5079 goto error;
5080
053c095a
JB		 5081 nlmsg_end(skb, nlh);
5082 return 0;
caeaba79
ND		 5083
5084error:
5085 nlmsg_cancel(skb, nlh);
5086 return -EMSGSIZE;
1da177e4
LT		 5087}
5088
5089static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
203651b6 5090 struct inet6_fill_args *args)
1da177e4 5091{
1da177e4 5092 struct nlmsghdr *nlh;
101bb229
TG		 5093 u8 scope = RT_SCOPE_UNIVERSE;
5094 int ifindex = ifmca->idev->dev->ifindex;
5095
5096 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5097 scope = RT_SCOPE_SITE;
1da177e4 5098
203651b6
CB		 5099 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5100 sizeof(struct ifaddrmsg), args->flags);
63159f29 5101 if (!nlh)
26932566 5102 return -EMSGSIZE;
85486af0 5103
203651b6 5104 if (args->netnsid >= 0 &&
ceb736e1
ZQ		 5105 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5106 nlmsg_cancel(skb, nlh);
6ecf4c37 5107 return -EMSGSIZE;
ceb736e1 5108 }
6ecf4c37 5109
0ab6803b 5110 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 5111 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 5112 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 5113 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5114 nlmsg_cancel(skb, nlh);
5115 return -EMSGSIZE;
5116 }
85486af0 5117
053c095a
JB		 5118 nlmsg_end(skb, nlh);
5119 return 0;
1da177e4
LT		 5120}
5121
5122static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
203651b6 5123 struct inet6_fill_args *args)
1da177e4 5124{
9ee8cbb2
DA		 5125 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5126 int ifindex = dev ? dev->ifindex : 1;
1da177e4 5127 struct nlmsghdr *nlh;
101bb229 5128 u8 scope = RT_SCOPE_UNIVERSE;
101bb229
TG		 5129
5130 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5131 scope = RT_SCOPE_SITE;
1da177e4 5132
203651b6
CB		 5133 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5134 sizeof(struct ifaddrmsg), args->flags);
63159f29 5135 if (!nlh)
26932566 5136 return -EMSGSIZE;
85486af0 5137
203651b6 5138 if (args->netnsid >= 0 &&
ceb736e1
ZQ		 5139 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5140 nlmsg_cancel(skb, nlh);
6ecf4c37 5141 return -EMSGSIZE;
ceb736e1 5142 }
6ecf4c37 5143
0ab6803b 5144 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 5145 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 5146 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 5147 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5148 nlmsg_cancel(skb, nlh);
5149 return -EMSGSIZE;
5150 }
1da177e4 5151
053c095a
JB		 5152 nlmsg_end(skb, nlh);
5153 return 0;
1da177e4
LT		 5154}
5155
234b27c3
ED		 5156/* called with rcu_read_lock() */
5157static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
fe884c2b 5158 struct netlink_callback *cb, int s_ip_idx,
6ba1e6e8 5159 struct inet6_fill_args *fillargs)
234b27c3 5160{
234b27c3
ED		 5161 struct ifmcaddr6 *ifmca;
5162 struct ifacaddr6 *ifaca;
fe884c2b 5163 int ip_idx = 0;
234b27c3 5164 int err = 1;
234b27c3
ED		 5165
5166 read_lock_bh(&idev->lock);
6ba1e6e8 5167 switch (fillargs->type) {
502a2ffd 5168 case UNICAST_ADDR: {
5169 struct inet6_ifaddr *ifa;
6ba1e6e8 5170 fillargs->event = RTM_NEWADDR;
502a2ffd 5171
234b27c3 5172 /* unicast address incl. temp addr */
502a2ffd 5173 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4ba4c566
DA		 5174 if (ip_idx < s_ip_idx)
5175 goto next;
6ba1e6e8 5176 err = inet6_fill_ifaddr(skb, ifa, fillargs);
053c095a 5177 if (err < 0)
234b27c3 5178 break;
63998ac2 5179 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4ba4c566
DA		 5180next:
5181 ip_idx++;
234b27c3
ED		 5182 }
5183 break;
502a2ffd 5184 }
234b27c3 5185 case MULTICAST_ADDR:
88e2ca30 5186 read_unlock_bh(&idev->lock);
6ba1e6e8 5187 fillargs->event = RTM_GETMULTICAST;
203651b6 5188
234b27c3 5189 /* multicast address */
4e43e64d 5190 for (ifmca = rtnl_dereference(idev->mc_list);
88e2ca30 5191 ifmca;
4e43e64d 5192 ifmca = rtnl_dereference(ifmca->next), ip_idx++) {
234b27c3
ED		 5193 if (ip_idx < s_ip_idx)
5194 continue;
6ba1e6e8 5195 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
053c095a 5196 if (err < 0)
234b27c3
ED		 5197 break;
5198 }
88e2ca30 5199 read_lock_bh(&idev->lock);
234b27c3
ED		 5200 break;
5201 case ANYCAST_ADDR:
6ba1e6e8 5202 fillargs->event = RTM_GETANYCAST;
234b27c3
ED		 5203 /* anycast address */
5204 for (ifaca = idev->ac_list; ifaca;
5205 ifaca = ifaca->aca_next, ip_idx++) {
5206 if (ip_idx < s_ip_idx)
5207 continue;
6ba1e6e8 5208 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
053c095a 5209 if (err < 0)
234b27c3
ED		 5210 break;
5211 }
5212 break;
5213 default:
5214 break;
5215 }
5216 read_unlock_bh(&idev->lock);
fe884c2b 5217 cb->args[2] = ip_idx;
234b27c3
ED		 5218 return err;
5219}
5220
ed6eff11
DA		 5221static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5222 struct inet6_fill_args *fillargs,
5223 struct net **tgt_net, struct sock *sk,
6371a71f 5224 struct netlink_callback *cb)
ed6eff11 5225{
6371a71f 5226 struct netlink_ext_ack *extack = cb->extack;
ed6eff11
DA		 5227 struct nlattr *tb[IFA_MAX+1];
5228 struct ifaddrmsg *ifm;
5229 int err, i;
5230
5231 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5232 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5233 return -EINVAL;
5234 }
5235
5236 ifm = nlmsg_data(nlh);
5237 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5238 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5239 return -EINVAL;
5240 }
6371a71f
DA		 5241
5242 fillargs->ifindex = ifm->ifa_index;
5243 if (fillargs->ifindex) {
5244 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5245 fillargs->flags |= NLM_F_DUMP_FILTERED;
ed6eff11
DA		 5246 }
5247
8cb08174
JB		 5248 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5249 ifa_ipv6_policy, extack);
ed6eff11
DA		 5250 if (err < 0)
5251 return err;
5252
5253 for (i = 0; i <= IFA_MAX; ++i) {
5254 if (!tb[i])
5255 continue;
5256
5257 if (i == IFA_TARGET_NETNSID) {
5258 struct net *net;
5259
5260 fillargs->netnsid = nla_get_s32(tb[i]);
5261 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5262 if (IS_ERR(net)) {
bf4cc40e 5263 fillargs->netnsid = -1;
ed6eff11
DA		 5264 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5265 return PTR_ERR(net);
5266 }
5267 *tgt_net = net;
5268 } else {
5269 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5270 return -EINVAL;
5271 }
5272 }
5273
5274 return 0;
5275}
5276
1da177e4
LT		 5277static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5278 enum addr_type_t type)
5279{
ed6eff11 5280 const struct nlmsghdr *nlh = cb->nlh;
6ba1e6e8
DA		 5281 struct inet6_fill_args fillargs = {
5282 .portid = NETLINK_CB(cb->skb).portid,
5283 .seq = cb->nlh->nlmsg_seq,
5284 .flags = NLM_F_MULTI,
5285 .netnsid = -1,
5286 .type = type,
5287 };
87117baf 5288 struct net *tgt_net = sock_net(skb->sk);
fe884c2b 5289 int idx, s_idx, s_ip_idx;
234b27c3 5290 int h, s_h;
1da177e4 5291 struct net_device *dev;
234b27c3
ED		 5292 struct inet6_dev *idev;
5293 struct hlist_head *head;
242afaa6 5294 int err = 0;
1ab1457c 5295
234b27c3
ED		 5296 s_h = cb->args[0];
5297 s_idx = idx = cb->args[1];
fe884c2b 5298 s_ip_idx = cb->args[2];
5d5619b4 5299
ed6eff11 5300 if (cb->strict_check) {
ed6eff11 5301 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
6371a71f 5302 skb->sk, cb);
ed6eff11 5303 if (err < 0)
242afaa6 5304 goto put_tgt_net;
6371a71f 5305
242afaa6 5306 err = 0;
6371a71f
DA		 5307 if (fillargs.ifindex) {
5308 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
242afaa6
DA		 5309 if (!dev) {
5310 err = -ENODEV;
5311 goto put_tgt_net;
5312 }
6371a71f
DA		 5313 idev = __in6_dev_get(dev);
5314 if (idev) {
5315 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5316 &fillargs);
1518039f
JK		 5317 if (err > 0)
5318 err = 0;
6371a71f
DA		 5319 }
5320 goto put_tgt_net;
5321 }
6ecf4c37
CB		 5322 }
5323
234b27c3 5324 rcu_read_lock();
6ecf4c37 5325 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
234b27c3
ED		 5326 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5327 idx = 0;
6ecf4c37 5328 head = &tgt_net->dev_index_head[h];
b67bfe0d 5329 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 5330 if (idx < s_idx)
5331 goto cont;
4b97efdf 5332 if (h > s_h || idx > s_idx)
234b27c3 5333 s_ip_idx = 0;
e21e8467
SH		 5334 idev = __in6_dev_get(dev);
5335 if (!idev)
234b27c3
ED		 5336 goto cont;
5337
fe884c2b 5338 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
6ba1e6e8 5339 &fillargs) < 0)
234b27c3 5340 goto done;
7562f876 5341cont:
234b27c3
ED		 5342 idx++;
5343 }
1da177e4 5344 }
234b27c3
ED		 5345done:
5346 rcu_read_unlock();
5347 cb->args[0] = h;
5348 cb->args[1] = idx;
6371a71f 5349put_tgt_net:
6ba1e6e8 5350 if (fillargs.netnsid >= 0)
6ecf4c37 5351 put_net(tgt_net);
234b27c3 5352
7c1e8a38 5353 return skb->len ? : err;
1da177e4
LT		 5354}
5355
5356static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5357{
5358 enum addr_type_t type = UNICAST_ADDR;
b854272b 5359
1da177e4
LT		 5360 return inet6_dump_addr(skb, cb, type);
5361}
5362
5363static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5364{
5365 enum addr_type_t type = MULTICAST_ADDR;
b854272b 5366
1da177e4
LT		 5367 return inet6_dump_addr(skb, cb, type);
5368}
5369
5370
5371static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5372{
5373 enum addr_type_t type = ANYCAST_ADDR;
b854272b 5374
1da177e4
LT		 5375 return inet6_dump_addr(skb, cb, type);
5376}
5377
4b1373de
JK		 5378static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5379 const struct nlmsghdr *nlh,
5380 struct nlattr **tb,
5381 struct netlink_ext_ack *extack)
5382{
5383 struct ifaddrmsg *ifm;
5384 int i, err;
5385
5386 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5387 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5388 return -EINVAL;
5389 }
5390
2beb6d29
HL		 5391 if (!netlink_strict_get_check(skb))
5392 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5393 ifa_ipv6_policy, extack);
5394
4b1373de
JK		 5395 ifm = nlmsg_data(nlh);
5396 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5397 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5398 return -EINVAL;
5399 }
5400
8cb08174
JB		 5401 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5402 ifa_ipv6_policy, extack);
4b1373de
JK		 5403 if (err)
5404 return err;
5405
5406 for (i = 0; i <= IFA_MAX; i++) {
5407 if (!tb[i])
5408 continue;
5409
5410 switch (i) {
5411 case IFA_TARGET_NETNSID:
5412 case IFA_ADDRESS:
5413 case IFA_LOCAL:
5414 break;
5415 default:
5416 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5417 return -EINVAL;
5418 }
5419 }
5420
5421 return 0;
5422}
5423
c21ef3e3
DA		 5424static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5425 struct netlink_ext_ack *extack)
6c223828 5426{
87117baf 5427 struct net *tgt_net = sock_net(in_skb->sk);
203651b6
CB		 5428 struct inet6_fill_args fillargs = {
5429 .portid = NETLINK_CB(in_skb).portid,
5430 .seq = nlh->nlmsg_seq,
5431 .event = RTM_NEWADDR,
5432 .flags = 0,
5433 .netnsid = -1,
5434 };
1b29fc2c
TG		 5435 struct ifaddrmsg *ifm;
5436 struct nlattr *tb[IFA_MAX+1];
caeaba79 5437 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 5438 struct net_device *dev = NULL;
5439 struct inet6_ifaddr *ifa;
5440 struct sk_buff *skb;
6c223828
NT		 5441 int err;
5442
4b1373de 5443 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
1b29fc2c 5444 if (err < 0)
c24675f8 5445 return err;
1b29fc2c 5446
6ecf4c37 5447 if (tb[IFA_TARGET_NETNSID]) {
203651b6 5448 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
6ecf4c37
CB		 5449
5450 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
203651b6 5451 fillargs.netnsid);
6ecf4c37
CB		 5452 if (IS_ERR(tgt_net))
5453 return PTR_ERR(tgt_net);
5454 }
5455
caeaba79 5456 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
c24675f8
FW		 5457 if (!addr)
5458 return -EINVAL;
6c223828 5459
1b29fc2c 5460 ifm = nlmsg_data(nlh);
6c223828 5461 if (ifm->ifa_index)
6ecf4c37 5462 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
6c223828 5463
6ecf4c37 5464 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
e21e8467 5465 if (!ifa) {
1b29fc2c
TG		 5466 err = -EADDRNOTAVAIL;
5467 goto errout;
5468 }
6c223828 5469
e21e8467
SH		 5470 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5471 if (!skb) {
6c223828 5472 err = -ENOBUFS;
1b29fc2c 5473 goto errout_ifa;
6c223828
NT		 5474 }
5475
203651b6 5476 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
26932566
PM		 5477 if (err < 0) {
5478 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5479 WARN_ON(err == -EMSGSIZE);
5480 kfree_skb(skb);
5481 goto errout_ifa;
5482 }
6ecf4c37 5483 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
1b29fc2c 5484errout_ifa:
6c223828 5485 in6_ifa_put(ifa);
1b29fc2c 5486errout:
1160dfa1 5487 dev_put(dev);
203651b6 5488 if (fillargs.netnsid >= 0)
6ecf4c37
CB		 5489 put_net(tgt_net);
5490
6c223828 5491 return err;
6c223828
NT		 5492}
5493
1da177e4
LT		 5494static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5495{
5496 struct sk_buff *skb;
c346dca1 5497 struct net *net = dev_net(ifa->idev->dev);
203651b6
CB		 5498 struct inet6_fill_args fillargs = {
5499 .portid = 0,
5500 .seq = 0,
5501 .event = event,
5502 .flags = 0,
5503 .netnsid = -1,
5504 };
5d620266 5505 int err = -ENOBUFS;
1da177e4 5506
0ab6803b 5507 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 5508 if (!skb)
5d620266
TG		 5509 goto errout;
5510
203651b6 5511 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
26932566
PM		 5512 if (err < 0) {
5513 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5514 WARN_ON(err == -EMSGSIZE);
5515 kfree_skb(skb);
5516 goto errout;
5517 }
1ce85fe4
PNA		 5518 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5519 return;
5d620266
TG		 5520errout:
5521 if (err < 0)
6fda7350 5522 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 5523}
5524
b6f99a21 5525static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 5526 __s32 *array, int bytes)
5527{
04561c1f
TG		 5528 BUG_ON(bytes < (DEVCONF_MAX * 4));
5529
1da177e4
LT		 5530 memset(array, 0, bytes);
5531 array[DEVCONF_FORWARDING] = cnf->forwarding;
5532 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5533 array[DEVCONF_MTU6] = cnf->mtu6;
5534 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5535 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5536 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5537 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5538 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 5539 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5540 jiffies_to_msecs(cnf->rtr_solicit_interval);
bd11f074
MŻ		 5541 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5542 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
93908d19
TG		 5543 array[DEVCONF_RTR_SOLICIT_DELAY] =
5544 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 5545 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 5546 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5547 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5548 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5549 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 5550 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5551 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5552 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5553 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5554 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 5555 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 5556 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
6b2e04bc 5557 array[DEVCONF_RA_DEFRTR_METRIC] = cnf->ra_defrtr_metric;
8013d1d7 5558 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 5559 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 5560#ifdef CONFIG_IPV6_ROUTER_PREF
5561 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 5562 array[DEVCONF_RTR_PROBE_INTERVAL] =
5563 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 5564#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 5565 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
09c884d4
YH		 5566 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5567#endif
930d6ff2 5568#endif
fbea49e1 5569 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 5570 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 5571#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5572 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 5573 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 5574#endif
7bc570c8 5575#ifdef CONFIG_IPV6_MROUTE
145c7a79 5576 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding);
7bc570c8 5577#endif
778d80be 5578 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 5579 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 5580 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 5581 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 5582 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 5583 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 5584 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 5585 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 5586 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 5587 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 5588 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 5589 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 5590 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1ababeba 5591 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
bf355b8d
DL		 5592#ifdef CONFIG_IPV6_SEG6_HMAC
5593 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5594#endif
adc176c5 5595 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
d35a00b8 5596 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
df789fe7 5597 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
2210d6b2 5598 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
8610c7c6 5599 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled;
9ee11f0f
JI		 5600 array[DEVCONF_IOAM6_ENABLED] = cnf->ioam6_enabled;
5601 array[DEVCONF_IOAM6_ID] = cnf->ioam6_id;
5602 array[DEVCONF_IOAM6_ID_WIDE] = cnf->ioam6_id_wide;
18ac597a 5603 array[DEVCONF_NDISC_EVICT_NOCARRIER] = cnf->ndisc_evict_nocarrier;
3e0b8f52 5604 array[DEVCONF_ACCEPT_UNTRACKED_NA] = cnf->accept_untracked_na;
1da177e4
LT		 5605}
5606
b382b191
TG		 5607static inline size_t inet6_ifla6_size(void)
5608{
5609 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5610 + nla_total_size(sizeof(struct ifla_cacheinfo))
5611 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5612 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4 5613 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
bdd72f41
SD		 5614 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5615 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
49b99da2 5616 + nla_total_size(4) /* IFLA_INET6_RA_MTU */
bdd72f41 5617 + 0;
b382b191
TG		 5618}
5619
339bf98f
TG		 5620static inline size_t inet6_if_nlmsg_size(void)
5621{
5622 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5623 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5624 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5625 + nla_total_size(4) /* IFLA_MTU */
5626 + nla_total_size(4) /* IFLA_LINK */
0344338b 5627 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 5628 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 5629}
c5396a31 5630
be281e55 5631static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
aca05671 5632 int bytes)
7f7d9a6b
HX		 5633{
5634 int i;
aca05671 5635 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
7f7d9a6b
HX		 5636 BUG_ON(pad < 0);
5637
5638 /* Use put_unaligned() because stats may not be aligned for u64. */
aca05671
JH		 5639 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5640 for (i = 1; i < ICMP6_MIB_MAX; i++)
be281e55 5641 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b 5642
aca05671 5643 memset(&stats[ICMP6_MIB_MAX], 0, pad);
7f7d9a6b
HX		 5644}
5645
698365fa 5646static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 5647 int bytes, size_t syncpoff)
4ce3c183 5648{
a3a77372
R		 5649 int i, c;
5650 u64 buff[IPSTATS_MIB_MAX];
5651 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5652
4ce3c183
ED		 5653 BUG_ON(pad < 0);
5654
a3a77372
R		 5655 memset(buff, 0, sizeof(buff));
5656 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 5657
a3a77372
R		 5658 for_each_possible_cpu(c) {
5659 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5660 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5661 }
5662
5663 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5664 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 5665}
5666
7f7d9a6b
HX		 5667static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5668 int bytes)
5669{
e21e8467 5670 switch (attrtype) {
7f7d9a6b 5671 case IFLA_INET6_STATS:
a3a77372
R		 5672 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5673 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 5674 break;
5675 case IFLA_INET6_ICMP6STATS:
aca05671 5676 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
7f7d9a6b
HX		 5677 break;
5678 }
5679}
5680
d5566fd7
SV		 5681static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5682 u32 ext_filter_mask)
b382b191
TG		 5683{
5684 struct nlattr *nla;
5685 struct ifla_cacheinfo ci;
5686
c78679e8
DM		 5687 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5688 goto nla_put_failure;
b382b191 5689 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 5690 ci.tstamp = cstamp_delta(idev->tstamp);
5691 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 5692 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 5693 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5694 goto nla_put_failure;
b382b191 5695 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 5696 if (!nla)
b382b191
TG		 5697 goto nla_put_failure;
5698 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5699
5700 /* XXX - MC not implemented */
5701
d5566fd7
SV		 5702 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5703 return 0;
5704
b382b191 5705 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 5706 if (!nla)
b382b191
TG		 5707 goto nla_put_failure;
5708 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5709
5710 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 5711 if (!nla)
b382b191
TG		 5712 goto nla_put_failure;
5713 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5714
f53adae4 5715 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 5716 if (!nla)
f53adae4
DB		 5717 goto nla_put_failure;
5718 read_lock_bh(&idev->lock);
5719 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5720 read_unlock_bh(&idev->lock);
5721
0d7982ce
ND		 5722 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5723 goto nla_put_failure;
5724
49b99da2
RY		 5725 if (idev->ra_mtu &&
5726 nla_put_u32(skb, IFLA_INET6_RA_MTU, idev->ra_mtu))
5727 goto nla_put_failure;
5728
b382b191
TG		 5729 return 0;
5730
5731nla_put_failure:
5732 return -EMSGSIZE;
5733}
5734
b1974ed0
AR		 5735static size_t inet6_get_link_af_size(const struct net_device *dev,
5736 u32 ext_filter_mask)
b382b191
TG		 5737{
5738 if (!__in6_dev_get(dev))
5739 return 0;
5740
5741 return inet6_ifla6_size();
5742}
5743
d5566fd7
SV		 5744static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5745 u32 ext_filter_mask)
b382b191
TG		 5746{
5747 struct inet6_dev *idev = __in6_dev_get(dev);
5748
5749 if (!idev)
5750 return -ENODATA;
5751
d5566fd7 5752 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5753 return -EMSGSIZE;
5754
5755 return 0;
5756}
5757
3583a4e8
SH		 5758static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token,
5759 struct netlink_ext_ack *extack)
f53adae4 5760{
f53adae4
DB		 5761 struct inet6_ifaddr *ifp;
5762 struct net_device *dev = idev->dev;
47e27d5e 5763 bool clear_token, update_rs = false;
dc848292 5764 struct in6_addr ll_addr;
f53adae4 5765
c15b1cca
HFS		 5766 ASSERT_RTNL();
5767
63159f29 5768 if (!token)
f53adae4 5769 return -EINVAL;
3583a4e8
SH		 5770
5771 if (dev->flags & IFF_LOOPBACK) {
5772 NL_SET_ERR_MSG_MOD(extack, "Device is loopback");
f53adae4 5773 return -EINVAL;
3583a4e8
SH		 5774 }
5775
5776 if (dev->flags & IFF_NOARP) {
5777 NL_SET_ERR_MSG_MOD(extack,
5778 "Device does not do neighbour discovery");
5779 return -EINVAL;
5780 }
5781
5782 if (!ipv6_accept_ra(idev)) {
5783 NL_SET_ERR_MSG_MOD(extack,
5784 "Router advertisement is disabled on device");
f53adae4 5785 return -EINVAL;
3583a4e8
SH		 5786 }
5787
5788 if (idev->cnf.rtr_solicits == 0) {
5789 NL_SET_ERR_MSG(extack,
5790 "Router solicitation is disabled on device");
f53adae4 5791 return -EINVAL;
3583a4e8 5792 }
f53adae4
DB		 5793
5794 write_lock_bh(&idev->lock);
5795
5796 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5797 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5798
5799 write_unlock_bh(&idev->lock);
5800
47e27d5e
DB		 5801 clear_token = ipv6_addr_any(token);
5802 if (clear_token)
5803 goto update_lft;
5804
dc848292
HFS		 5805 if (!idev->dead && (idev->if_flags & IF_READY) &&
5806 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5807 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5808 /* If we're not ready, then normal ifup will take care
5809 * of this. Otherwise, we need to request our rs here.
5810 */
5811 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5812 update_rs = true;
5813 }
f53adae4 5814
47e27d5e 5815update_lft:
f53adae4 5816 write_lock_bh(&idev->lock);
fc403832 5817
77ecaace 5818 if (update_rs) {
fc403832 5819 idev->if_flags |= IF_RS_SENT;
bd11f074
MŻ		 5820 idev->rs_interval = rfc3315_s14_backoff_init(
5821 idev->cnf.rtr_solicit_interval);
77ecaace 5822 idev->rs_probes = 1;
bd11f074 5823 addrconf_mod_rs_timer(idev, idev->rs_interval);
77ecaace 5824 }
f53adae4
DB		 5825
5826 /* Well, that's kinda nasty ... */
5827 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5828 spin_lock(&ifp->lock);
617fe29d 5829 if (ifp->tokenized) {
f53adae4
DB		 5830 ifp->valid_lft = 0;
5831 ifp->prefered_lft = 0;
5832 }
5833 spin_unlock(&ifp->lock);
5834 }
5835
5836 write_unlock_bh(&idev->lock);
b2ed64a9 5837 inet6_ifinfo_notify(RTM_NEWLINK, idev);
8805d13f 5838 addrconf_verify_rtnl(dev_net(dev));
f53adae4
DB		 5839 return 0;
5840}
5841
11b1f828
DB		 5842static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5843 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5844 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
49b99da2
RY		 5845 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT,
5846 .reject_message =
5847 "IFLA_INET6_RA_MTU can not be set" },
11b1f828
DB		 5848};
5849
d35a00b8
FJ		 5850static int check_addr_gen_mode(int mode)
5851{
5852 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5853 mode != IN6_ADDR_GEN_MODE_NONE &&
5854 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5855 mode != IN6_ADDR_GEN_MODE_RANDOM)
5856 return -EINVAL;
5857 return 1;
5858}
5859
5860static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5861 int mode)
5862{
5863 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5864 !idev->cnf.stable_secret.initialized &&
5865 !net->ipv6.devconf_dflt->stable_secret.initialized)
5866 return -EINVAL;
5867 return 1;
5868}
5869
7dc2bcca 5870static int inet6_validate_link_af(const struct net_device *dev,
8679c31e
RY		 5871 const struct nlattr *nla,
5872 struct netlink_ext_ack *extack)
7dc2bcca
MM		 5873{
5874 struct nlattr *tb[IFLA_INET6_MAX + 1];
5875 struct inet6_dev *idev = NULL;
5876 int err;
5877
5878 if (dev) {
5879 idev = __in6_dev_get(dev);
5880 if (!idev)
5881 return -EAFNOSUPPORT;
5882 }
5883
5884 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
8679c31e 5885 inet6_af_policy, extack);
7dc2bcca
MM		 5886 if (err)
5887 return err;
5888
5889 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5890 return -EINVAL;
5891
5892 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5893 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5894
5895 if (check_addr_gen_mode(mode) < 0)
5896 return -EINVAL;
5897 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5898 return -EINVAL;
5899 }
5900
5901 return 0;
5902}
5903
3583a4e8
SH		 5904static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla,
5905 struct netlink_ext_ack *extack)
f53adae4 5906{
f53adae4
DB		 5907 struct inet6_dev *idev = __in6_dev_get(dev);
5908 struct nlattr *tb[IFLA_INET6_MAX + 1];
7dc2bcca 5909 int err;
f53adae4 5910
db3fa271
ED		 5911 if (!idev)
5912 return -EAFNOSUPPORT;
5913
8cb08174 5914 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5ac6b198 5915 return -EINVAL;
f53adae4 5916
bc91b0f0 5917 if (tb[IFLA_INET6_TOKEN]) {
3583a4e8
SH		 5918 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]),
5919 extack);
bc91b0f0
JP		 5920 if (err)
5921 return err;
5922 }
5923
5924 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5925 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5926
d35a00b8 5927 idev->cnf.addr_gen_mode = mode;
bc91b0f0 5928 }
f53adae4 5929
7dc2bcca 5930 return 0;
f53adae4
DB		 5931}
5932
1ab1457c 5933static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5934 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5935{
04561c1f 5936 struct net_device *dev = idev->dev;
04561c1f
TG		 5937 struct ifinfomsg *hdr;
5938 struct nlmsghdr *nlh;
5939 void *protoinfo;
04561c1f 5940
15e47304 5941 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5942 if (!nlh)
26932566 5943 return -EMSGSIZE;
04561c1f
TG		 5944
5945 hdr = nlmsg_data(nlh);
5946 hdr->ifi_family = AF_INET6;
5947 hdr->__ifi_pad = 0;
5948 hdr->ifi_type = dev->type;
5949 hdr->ifi_index = dev->ifindex;
5950 hdr->ifi_flags = dev_get_flags(dev);
5951 hdr->ifi_change = 0;
5952
c78679e8
DM		 5953 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5954 (dev->addr_len &&
5955 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5956 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5957 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5958 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5959 nla_put_u8(skb, IFLA_OPERSTATE,
5960 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5961 goto nla_put_failure;
ae0be8de 5962 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
63159f29 5963 if (!protoinfo)
04561c1f 5964 goto nla_put_failure;
1da177e4 5965
d5566fd7 5966 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5967 goto nla_put_failure;
1da177e4 5968
04561c1f 5969 nla_nest_end(skb, protoinfo);
053c095a
JB		 5970 nlmsg_end(skb, nlh);
5971 return 0;
1da177e4 5972
04561c1f 5973nla_put_failure:
26932566
PM		 5974 nlmsg_cancel(skb, nlh);
5975 return -EMSGSIZE;
1da177e4
LT		 5976}
5977
786e0007
DA		 5978static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5979 struct netlink_ext_ack *extack)
5980{
5981 struct ifinfomsg *ifm;
5982
5983 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5984 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5985 return -EINVAL;
5986 }
5987
5988 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5989 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5990 return -EINVAL;
5991 }
5992
5993 ifm = nlmsg_data(nlh);
5994 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5995 ifm->ifi_change || ifm->ifi_index) {
5996 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5997 return -EINVAL;
5998 }
5999
6000 return 0;
6001}
6002
1da177e4
LT		 6003static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
6004{
3b1e0a65 6005 struct net *net = sock_net(skb->sk);
84d2697d 6006 int h, s_h;
434a8a58 6007 int idx = 0, s_idx;
1da177e4
LT		 6008 struct net_device *dev;
6009 struct inet6_dev *idev;
84d2697d 6010 struct hlist_head *head;
1da177e4 6011
786e0007
DA		 6012 /* only requests using strict checking can pass data to
6013 * influence the dump
6014 */
6015 if (cb->strict_check) {
6016 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
6017
6018 if (err < 0)
6019 return err;
6020 }
6021
84d2697d
ED		 6022 s_h = cb->args[0];
6023 s_idx = cb->args[1];
6024
6025 rcu_read_lock();
6026 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
6027 idx = 0;
6028 head = &net->dev_index_head[h];
b67bfe0d 6029 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 6030 if (idx < s_idx)
6031 goto cont;
6032 idev = __in6_dev_get(dev);
6033 if (!idev)
6034 goto cont;
6035 if (inet6_fill_ifinfo(skb, idev,
15e47304 6036 NETLINK_CB(cb->skb).portid,
84d2697d 6037 cb->nlh->nlmsg_seq,
053c095a 6038 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 6039 goto out;
7562f876 6040cont:
84d2697d
ED		 6041 idx++;
6042 }
1da177e4 6043 }
84d2697d
ED		 6044out:
6045 rcu_read_unlock();
6046 cb->args[1] = idx;
6047 cb->args[0] = h;
1da177e4
LT		 6048
6049 return skb->len;
6050}
6051
6052void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
6053{
6054 struct sk_buff *skb;
c346dca1 6055 struct net *net = dev_net(idev->dev);
8d7a76c9 6056 int err = -ENOBUFS;
1ab1457c 6057
339bf98f 6058 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 6059 if (!skb)
8d7a76c9
TG		 6060 goto errout;
6061
6062 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 6063 if (err < 0) {
6064 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
6065 WARN_ON(err == -EMSGSIZE);
6066 kfree_skb(skb);
6067 goto errout;
6068 }
5f75a104 6069 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 6070 return;
8d7a76c9
TG		 6071errout:
6072 if (err < 0)
5f75a104 6073 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 6074}
6075
339bf98f
TG		 6076static inline size_t inet6_prefix_nlmsg_size(void)
6077{
6078 return NLMSG_ALIGN(sizeof(struct prefixmsg))
6079 + nla_total_size(sizeof(struct in6_addr))
6080 + nla_total_size(sizeof(struct prefix_cacheinfo));
6081}
c5396a31 6082
1da177e4 6083static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 6084 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 6085 int event, unsigned int flags)
1da177e4 6086{
6051e2f4
TG		 6087 struct prefixmsg *pmsg;
6088 struct nlmsghdr *nlh;
1da177e4
LT		 6089 struct prefix_cacheinfo ci;
6090
15e47304 6091 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 6092 if (!nlh)
26932566 6093 return -EMSGSIZE;
6051e2f4
TG		 6094
6095 pmsg = nlmsg_data(nlh);
1da177e4 6096 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 6097 pmsg->prefix_pad1 = 0;
6098 pmsg->prefix_pad2 = 0;
1da177e4
LT		 6099 pmsg->prefix_ifindex = idev->dev->ifindex;
6100 pmsg->prefix_len = pinfo->prefix_len;
6101 pmsg->prefix_type = pinfo->type;
8a47077a 6102 pmsg->prefix_pad3 = 0;
1da177e4
LT		 6103 pmsg->prefix_flags = 0;
6104 if (pinfo->onlink)
6105 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
6106 if (pinfo->autoconf)
6107 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
6108
c78679e8
DM		 6109 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
6110 goto nla_put_failure;
1da177e4
LT		 6111 ci.preferred_time = ntohl(pinfo->prefered);
6112 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 6113 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
6114 goto nla_put_failure;
053c095a
JB		 6115 nlmsg_end(skb, nlh);
6116 return 0;
1da177e4 6117
6051e2f4 6118nla_put_failure:
26932566
PM		 6119 nlmsg_cancel(skb, nlh);
6120 return -EMSGSIZE;
1da177e4
LT		 6121}
6122
1ab1457c 6123static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 6124 struct prefix_info *pinfo)
6125{
6126 struct sk_buff *skb;
c346dca1 6127 struct net *net = dev_net(idev->dev);
8c384bfa 6128 int err = -ENOBUFS;
1da177e4 6129
339bf98f 6130 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 6131 if (!skb)
8c384bfa
TG		 6132 goto errout;
6133
6134 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 6135 if (err < 0) {
6136 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6137 WARN_ON(err == -EMSGSIZE);
6138 kfree_skb(skb);
6139 goto errout;
6140 }
1ce85fe4
PNA		 6141 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6142 return;
8c384bfa
TG		 6143errout:
6144 if (err < 0)
6fda7350 6145 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 6146}
6147
1da177e4
LT		 6148static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6149{
63998ac2
ND		 6150 struct net *net = dev_net(ifp->idev->dev);
6151
c15b1cca
HFS		 6152 if (event)
6153 ASSERT_RTNL();
6154
1da177e4
LT		 6155 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6156
6157 switch (event) {
6158 case RTM_NEWADDR:
95c385b4 6159 /*
2d819d25
DA		 6160 * If the address was optimistic we inserted the route at the
6161 * start of our DAD process, so we don't need to do it again.
6162 * If the device was taken down in the middle of the DAD
6163 * cycle there is a race where we could get here without a
6164 * host route, so nothing to insert. That will be fixed when
6165 * the device is brought up.
95c385b4 6166 */
2d819d25 6167 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
afb1d4b5 6168 ip6_ins_rt(net, ifp->rt);
2d819d25
DA		 6169 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6170 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6171 &ifp->addr, ifp->idev->dev->name);
6172 }
6173
1da177e4
LT		 6174 if (ifp->idev->cnf.forwarding)
6175 addrconf_join_anycast(ifp);
7996c799 6176 if (!ipv6_addr_any(&ifp->peer_addr))
07758eb9
HL		 6177 addrconf_prefix_route(&ifp->peer_addr, 128,
6178 ifp->rt_priority, ifp->idev->dev,
6179 0, 0, GFP_ATOMIC);
1da177e4
LT		 6180 break;
6181 case RTM_DELADDR:
6182 if (ifp->idev->cnf.forwarding)
6183 addrconf_leave_anycast(ifp);
6184 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 6185 if (!ipv6_addr_any(&ifp->peer_addr)) {
8d1c802b 6186 struct fib6_info *rt;
caeaba79 6187
e7478dfc 6188 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
2b2450ca
DA		 6189 ifp->idev->dev, 0, 0,
6190 false);
8e3d5be7 6191 if (rt)
11dd74b3 6192 ip6_del_rt(net, rt, false);
caeaba79 6193 }
38bd10c4 6194 if (ifp->rt) {
11dd74b3 6195 ip6_del_rt(net, ifp->rt, false);
93531c67 6196 ifp->rt = NULL;
38bd10c4 6197 }
705f1c86 6198 rt_genid_bump_ipv6(net);
1da177e4
LT		 6199 break;
6200 }
63998ac2 6201 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 6202}
6203
6204static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6205{
1da177e4
LT		 6206 if (likely(ifp->idev->dead == 0))
6207 __ipv6_ifa_notify(event, ifp);
1da177e4
LT		 6208}
6209
6210#ifdef CONFIG_SYSCTL
6211
32927393
CH		 6212static int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6213 void *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 6214{
6215 int *valp = ctl->data;
6216 int val = *valp;
88af182e 6217 loff_t pos = *ppos;
fe2c6338 6218 struct ctl_table lctl;
1da177e4
LT		 6219 int ret;
6220
013d97e9
FR		 6221 /*
6222 * ctl->data points to idev->cnf.forwarding, we should
6223 * not modify it until we get the rtnl lock.
6224 */
6225 lctl = *ctl;
6226 lctl.data = &val;
6227
6228 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 6229
c8fecf22 6230 if (write)
b325fddb 6231 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 6232 if (ret)
6233 *ppos = pos;
1ab1457c 6234 return ret;
1da177e4
LT		 6235}
6236
32927393
CH		 6237static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6238 void *buffer, size_t *lenp, loff_t *ppos)
77751427
ML		 6239{
6240 struct inet6_dev *idev = ctl->extra1;
6241 int min_mtu = IPV6_MIN_MTU;
6242 struct ctl_table lctl;
6243
6244 lctl = *ctl;
6245 lctl.extra1 = &min_mtu;
6246 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6247
6248 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6249}
6250
56d417b1
BH		 6251static void dev_disable_change(struct inet6_dev *idev)
6252{
75538c2b
CW		 6253 struct netdev_notifier_info info;
6254
56d417b1
BH		 6255 if (!idev || !idev->dev)
6256 return;
6257
75538c2b 6258 netdev_notifier_info_init(&info, idev->dev);
56d417b1 6259 if (idev->cnf.disable_ipv6)
75538c2b 6260 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 6261 else
75538c2b 6262 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 6263}
6264
6265static void addrconf_disable_change(struct net *net, __s32 newf)
6266{
6267 struct net_device *dev;
6268 struct inet6_dev *idev;
6269
03e4deff 6270 for_each_netdev(net, dev) {
56d417b1
BH		 6271 idev = __in6_dev_get(dev);
6272 if (idev) {
6273 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6274 idev->cnf.disable_ipv6 = newf;
6275 if (changed)
6276 dev_disable_change(idev);
6277 }
56d417b1 6278 }
56d417b1
BH		 6279}
6280
013d97e9 6281static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 6282{
6283 struct net *net;
013d97e9
FR		 6284 int old;
6285
6286 if (!rtnl_trylock())
6287 return restart_syscall();
56d417b1
BH		 6288
6289 net = (struct net *)table->extra2;
013d97e9
FR		 6290 old = *p;
6291 *p = newf;
56d417b1 6292
013d97e9
FR		 6293 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6294 rtnl_unlock();
56d417b1 6295 return 0;
88af182e 6296 }
56d417b1
BH		 6297
6298 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 6299 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6300 addrconf_disable_change(net, newf);
013d97e9 6301 } else if ((!newf) ^ (!old))
56d417b1
BH		 6302 dev_disable_change((struct inet6_dev *)table->extra1);
6303
6304 rtnl_unlock();
6305 return 0;
6306}
6307
32927393
CH		 6308static int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6309 void *buffer, size_t *lenp, loff_t *ppos)
56d417b1
BH		 6310{
6311 int *valp = ctl->data;
6312 int val = *valp;
88af182e 6313 loff_t pos = *ppos;
fe2c6338 6314 struct ctl_table lctl;
56d417b1
BH		 6315 int ret;
6316
013d97e9
FR		 6317 /*
6318 * ctl->data points to idev->cnf.disable_ipv6, we should
6319 * not modify it until we get the rtnl lock.
6320 */
6321 lctl = *ctl;
6322 lctl.data = &val;
6323
6324 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 6325
6326 if (write)
6327 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 6328 if (ret)
6329 *ppos = pos;
56d417b1
BH		 6330 return ret;
6331}
6332
32927393
CH		 6333static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6334 void *buffer, size_t *lenp, loff_t *ppos)
c92d5491 6335{
6336 int *valp = ctl->data;
6337 int ret;
6338 int old, new;
6339
6340 old = *valp;
6341 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6342 new = *valp;
6343
6344 if (write && old != new) {
6345 struct net *net = ctl->extra2;
6346
6347 if (!rtnl_trylock())
6348 return restart_syscall();
6349
6350 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
85b3daad
DA		 6351 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6352 NETCONFA_PROXY_NEIGH,
c92d5491 6353 NETCONFA_IFINDEX_DEFAULT,
6354 net->ipv6.devconf_dflt);
6355 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
85b3daad
DA		 6356 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6357 NETCONFA_PROXY_NEIGH,
c92d5491 6358 NETCONFA_IFINDEX_ALL,
6359 net->ipv6.devconf_all);
6360 else {
6361 struct inet6_dev *idev = ctl->extra1;
6362
85b3daad
DA		 6363 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6364 NETCONFA_PROXY_NEIGH,
c92d5491 6365 idev->dev->ifindex,
6366 &idev->cnf);
6367 }
6368 rtnl_unlock();
6369 }
6370
6371 return ret;
6372}
6373
d35a00b8 6374static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
32927393 6375 void *buffer, size_t *lenp,
d35a00b8
FJ		 6376 loff_t *ppos)
6377{
6378 int ret = 0;
c6dbf7aa 6379 u32 new_val;
d35a00b8
FJ		 6380 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6381 struct net *net = (struct net *)ctl->extra2;
c6dbf7aa
SD		 6382 struct ctl_table tmp = {
6383 .data = &new_val,
6384 .maxlen = sizeof(new_val),
6385 .mode = ctl->mode,
6386 };
d35a00b8 6387
8c171d6c
FJ		 6388 if (!rtnl_trylock())
6389 return restart_syscall();
6390
c6dbf7aa 6391 new_val = *((u32 *)ctl->data);
d35a00b8 6392
c6dbf7aa
SD		 6393 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6394 if (ret != 0)
6395 goto out;
d35a00b8 6396
c6dbf7aa 6397 if (write) {
8c171d6c
FJ		 6398 if (check_addr_gen_mode(new_val) < 0) {
6399 ret = -EINVAL;
6400 goto out;
6401 }
d35a00b8 6402
c6dbf7aa 6403 if (idev) {
8c171d6c
FJ		 6404 if (check_stable_privacy(idev, net, new_val) < 0) {
6405 ret = -EINVAL;
6406 goto out;
6407 }
d35a00b8
FJ		 6408
6409 if (idev->cnf.addr_gen_mode != new_val) {
6410 idev->cnf.addr_gen_mode = new_val;
23ca0c2c 6411 addrconf_init_auto_addrs(idev->dev);
d35a00b8 6412 }
f24c5987
SD		 6413 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6414 struct net_device *dev;
6415
6416 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6417 for_each_netdev(net, dev) {
6418 idev = __in6_dev_get(dev);
6419 if (idev &&
6420 idev->cnf.addr_gen_mode != new_val) {
6421 idev->cnf.addr_gen_mode = new_val;
23ca0c2c 6422 addrconf_init_auto_addrs(idev->dev);
f24c5987
SD		 6423 }
6424 }
d35a00b8 6425 }
c6dbf7aa
SD		 6426
6427 *((u32 *)ctl->data) = new_val;
d35a00b8
FJ		 6428 }
6429
8c171d6c
FJ		 6430out:
6431 rtnl_unlock();
6432
d35a00b8
FJ		 6433 return ret;
6434}
6435
3d1bec99 6436static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
32927393 6437 void *buffer, size_t *lenp,
3d1bec99
HFS		 6438 loff_t *ppos)
6439{
6440 int err;
6441 struct in6_addr addr;
6442 char str[IPV6_MAX_STRLEN];
6443 struct ctl_table lctl = *ctl;
622c81d5 6444 struct net *net = ctl->extra2;
3d1bec99
HFS		 6445 struct ipv6_stable_secret *secret = ctl->data;
6446
622c81d5
HFS		 6447 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6448 return -EIO;
6449
3d1bec99
HFS		 6450 lctl.maxlen = IPV6_MAX_STRLEN;
6451 lctl.data = str;
6452
6453 if (!rtnl_trylock())
6454 return restart_syscall();
6455
6456 if (!write && !secret->initialized) {
6457 err = -EIO;
6458 goto out;
6459 }
6460
5449a5ca
WC		 6461 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6462 if (err >= sizeof(str)) {
6463 err = -EIO;
6464 goto out;
3d1bec99
HFS		 6465 }
6466
6467 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6468 if (err || !write)
6469 goto out;
6470
6471 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6472 err = -EIO;
6473 goto out;
6474 }
6475
6476 secret->initialized = true;
6477 secret->secret = addr;
6478
622c81d5
HFS		 6479 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6480 struct net_device *dev;
6481
6482 for_each_netdev(net, dev) {
6483 struct inet6_dev *idev = __in6_dev_get(dev);
6484
6485 if (idev) {
d35a00b8 6486 idev->cnf.addr_gen_mode =
622c81d5
HFS		 6487 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6488 }
6489 }
6490 } else {
6491 struct inet6_dev *idev = ctl->extra1;
6492
d35a00b8 6493 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
622c81d5
HFS		 6494 }
6495
3d1bec99
HFS		 6496out:
6497 rtnl_unlock();
6498
6499 return err;
6500}
c92d5491 6501
35103d11
AG		 6502static
6503int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
32927393 6504 int write, void *buffer,
35103d11
AG		 6505 size_t *lenp,
6506 loff_t *ppos)
6507{
6508 int *valp = ctl->data;
6509 int val = *valp;
6510 loff_t pos = *ppos;
6511 struct ctl_table lctl;
6512 int ret;
6513
6514 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6515 * we should not modify it until we get the rtnl lock.
6516 */
6517 lctl = *ctl;
6518 lctl.data = &val;
6519
6520 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6521
6522 if (write)
6523 ret = addrconf_fixup_linkdown(ctl, valp, val);
6524 if (ret)
6525 *ppos = pos;
6526 return ret;
6527}
6528
df789fe7
DF		 6529static
6530void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6531{
6532 if (rt) {
6533 if (action)
6534 rt->dst.flags |= DST_NOPOLICY;
6535 else
6536 rt->dst.flags &= ~DST_NOPOLICY;
6537 }
6538}
6539
6540static
6541void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6542{
6543 struct inet6_ifaddr *ifa;
6544
6545 read_lock_bh(&idev->lock);
6546 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6547 spin_lock(&ifa->lock);
6548 if (ifa->rt) {
f88d8ea6 6549 /* host routes only use builtin fib6_nh */
1cf844c7 6550 struct fib6_nh *nh = ifa->rt->fib6_nh;
df789fe7
DF		 6551 int cpu;
6552
66f5d6ce 6553 rcu_read_lock();
3b6761d1 6554 ifa->rt->dst_nopolicy = val ? true : false;
f40b6ae2 6555 if (nh->rt6i_pcpu) {
df789fe7
DF		 6556 for_each_possible_cpu(cpu) {
6557 struct rt6_info **rtp;
6558
f40b6ae2 6559 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
df789fe7
DF		 6560 addrconf_set_nopolicy(*rtp, val);
6561 }
6562 }
66f5d6ce 6563 rcu_read_unlock();
df789fe7
DF		 6564 }
6565 spin_unlock(&ifa->lock);
6566 }
6567 read_unlock_bh(&idev->lock);
6568}
6569
6570static
6571int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6572{
6573 struct inet6_dev *idev;
6574 struct net *net;
6575
6576 if (!rtnl_trylock())
6577 return restart_syscall();
6578
6579 *valp = val;
6580
6581 net = (struct net *)ctl->extra2;
6582 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6583 rtnl_unlock();
6584 return 0;
6585 }
6586
6587 if (valp == &net->ipv6.devconf_all->disable_policy) {
6588 struct net_device *dev;
6589
6590 for_each_netdev(net, dev) {
6591 idev = __in6_dev_get(dev);
6592 if (idev)
6593 addrconf_disable_policy_idev(idev, val);
6594 }
6595 } else {
6596 idev = (struct inet6_dev *)ctl->extra1;
6597 addrconf_disable_policy_idev(idev, val);
6598 }
6599
6600 rtnl_unlock();
6601 return 0;
6602}
6603
32927393
CH		 6604static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6605 void *buffer, size_t *lenp, loff_t *ppos)
df789fe7
DF		 6606{
6607 int *valp = ctl->data;
6608 int val = *valp;
6609 loff_t pos = *ppos;
6610 struct ctl_table lctl;
6611 int ret;
6612
6613 lctl = *ctl;
6614 lctl.data = &val;
6615 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6616
6617 if (write && (*valp != val))
6618 ret = addrconf_disable_policy(ctl, valp, val);
6619
6620 if (ret)
6621 *ppos = pos;
6622
6623 return ret;
6624}
6625
cb4a4c69 6626static int minus_one = -1;
cb9e684e 6627static const int two_five_five = 255;
176f716c 6628static u32 ioam6_if_id_max = U16_MAX;
cb9e684e 6629
607ea7cd 6630static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 6631 {
6632 .procname = "forwarding",
6633 .data = &ipv6_devconf.forwarding,
6634 .maxlen = sizeof(int),
6635 .mode = 0644,
6636 .proc_handler = addrconf_sysctl_forward,
6637 },
6638 {
6639 .procname = "hop_limit",
6640 .data = &ipv6_devconf.hop_limit,
6641 .maxlen = sizeof(int),
6642 .mode = 0644,
cb9e684e 6643 .proc_handler = proc_dointvec_minmax,
eec4844f 6644 .extra1 = (void *)SYSCTL_ONE,
cb9e684e 6645 .extra2 = (void *)&two_five_five,
5df1f77f
KK		 6646 },
6647 {
6648 .procname = "mtu",
6649 .data = &ipv6_devconf.mtu6,
6650 .maxlen = sizeof(int),
6651 .mode = 0644,
6652 .proc_handler = addrconf_sysctl_mtu,
6653 },
6654 {
6655 .procname = "accept_ra",
6656 .data = &ipv6_devconf.accept_ra,
6657 .maxlen = sizeof(int),
6658 .mode = 0644,
6659 .proc_handler = proc_dointvec,
6660 },
6661 {
6662 .procname = "accept_redirects",
6663 .data = &ipv6_devconf.accept_redirects,
6664 .maxlen = sizeof(int),
6665 .mode = 0644,
6666 .proc_handler = proc_dointvec,
6667 },
6668 {
6669 .procname = "autoconf",
6670 .data = &ipv6_devconf.autoconf,
6671 .maxlen = sizeof(int),
6672 .mode = 0644,
6673 .proc_handler = proc_dointvec,
6674 },
6675 {
6676 .procname = "dad_transmits",
6677 .data = &ipv6_devconf.dad_transmits,
6678 .maxlen = sizeof(int),
6679 .mode = 0644,
6680 .proc_handler = proc_dointvec,
6681 },
6682 {
6683 .procname = "router_solicitations",
6684 .data = &ipv6_devconf.rtr_solicits,
6685 .maxlen = sizeof(int),
6686 .mode = 0644,
cb4a4c69
MŻ		 6687 .proc_handler = proc_dointvec_minmax,
6688 .extra1 = &minus_one,
5df1f77f
KK		 6689 },
6690 {
6691 .procname = "router_solicitation_interval",
6692 .data = &ipv6_devconf.rtr_solicit_interval,
6693 .maxlen = sizeof(int),
6694 .mode = 0644,
6695 .proc_handler = proc_dointvec_jiffies,
6696 },
bd11f074
MŻ		 6697 {
6698 .procname = "router_solicitation_max_interval",
6699 .data = &ipv6_devconf.rtr_solicit_max_interval,
6700 .maxlen = sizeof(int),
6701 .mode = 0644,
6702 .proc_handler = proc_dointvec_jiffies,
6703 },
5df1f77f
KK		 6704 {
6705 .procname = "router_solicitation_delay",
6706 .data = &ipv6_devconf.rtr_solicit_delay,
6707 .maxlen = sizeof(int),
6708 .mode = 0644,
6709 .proc_handler = proc_dointvec_jiffies,
6710 },
6711 {
6712 .procname = "force_mld_version",
6713 .data = &ipv6_devconf.force_mld_version,
6714 .maxlen = sizeof(int),
6715 .mode = 0644,
6716 .proc_handler = proc_dointvec,
6717 },
6718 {
6719 .procname = "mldv1_unsolicited_report_interval",
6720 .data =
6721 &ipv6_devconf.mldv1_unsolicited_report_interval,
6722 .maxlen = sizeof(int),
6723 .mode = 0644,
6724 .proc_handler = proc_dointvec_ms_jiffies,
6725 },
6726 {
6727 .procname = "mldv2_unsolicited_report_interval",
6728 .data =
6729 &ipv6_devconf.mldv2_unsolicited_report_interval,
6730 .maxlen = sizeof(int),
6731 .mode = 0644,
6732 .proc_handler = proc_dointvec_ms_jiffies,
6733 },
6734 {
6735 .procname = "use_tempaddr",
6736 .data = &ipv6_devconf.use_tempaddr,
6737 .maxlen = sizeof(int),
6738 .mode = 0644,
6739 .proc_handler = proc_dointvec,
6740 },
6741 {
6742 .procname = "temp_valid_lft",
6743 .data = &ipv6_devconf.temp_valid_lft,
6744 .maxlen = sizeof(int),
6745 .mode = 0644,
6746 .proc_handler = proc_dointvec,
6747 },
6748 {
6749 .procname = "temp_prefered_lft",
6750 .data = &ipv6_devconf.temp_prefered_lft,
6751 .maxlen = sizeof(int),
6752 .mode = 0644,
6753 .proc_handler = proc_dointvec,
6754 },
6755 {
6756 .procname = "regen_max_retry",
6757 .data = &ipv6_devconf.regen_max_retry,
6758 .maxlen = sizeof(int),
6759 .mode = 0644,
6760 .proc_handler = proc_dointvec,
6761 },
6762 {
6763 .procname = "max_desync_factor",
6764 .data = &ipv6_devconf.max_desync_factor,
6765 .maxlen = sizeof(int),
6766 .mode = 0644,
6767 .proc_handler = proc_dointvec,
6768 },
6769 {
6770 .procname = "max_addresses",
6771 .data = &ipv6_devconf.max_addresses,
6772 .maxlen = sizeof(int),
6773 .mode = 0644,
6774 .proc_handler = proc_dointvec,
6775 },
6776 {
6777 .procname = "accept_ra_defrtr",
6778 .data = &ipv6_devconf.accept_ra_defrtr,
6779 .maxlen = sizeof(int),
6780 .mode = 0644,
6781 .proc_handler = proc_dointvec,
6782 },
6b2e04bc
PC		 6783 {
6784 .procname = "ra_defrtr_metric",
6785 .data = &ipv6_devconf.ra_defrtr_metric,
6786 .maxlen = sizeof(u32),
6787 .mode = 0644,
6788 .proc_handler = proc_douintvec_minmax,
6789 .extra1 = (void *)SYSCTL_ONE,
6790 },
5df1f77f
KK		 6791 {
6792 .procname = "accept_ra_min_hop_limit",
6793 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6794 .maxlen = sizeof(int),
6795 .mode = 0644,
6796 .proc_handler = proc_dointvec,
6797 },
6798 {
6799 .procname = "accept_ra_pinfo",
6800 .data = &ipv6_devconf.accept_ra_pinfo,
6801 .maxlen = sizeof(int),
6802 .mode = 0644,
6803 .proc_handler = proc_dointvec,
6804 },
930d6ff2 6805#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 6806 {
6807 .procname = "accept_ra_rtr_pref",
6808 .data = &ipv6_devconf.accept_ra_rtr_pref,
6809 .maxlen = sizeof(int),
6810 .mode = 0644,
6811 .proc_handler = proc_dointvec,
6812 },
6813 {
6814 .procname = "router_probe_interval",
6815 .data = &ipv6_devconf.rtr_probe_interval,
6816 .maxlen = sizeof(int),
6817 .mode = 0644,
6818 .proc_handler = proc_dointvec_jiffies,
6819 },
fa03ef38 6820#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b
JS		 6821 {
6822 .procname = "accept_ra_rt_info_min_plen",
6823 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6824 .maxlen = sizeof(int),
6825 .mode = 0644,
6826 .proc_handler = proc_dointvec,
6827 },
5df1f77f
KK		 6828 {
6829 .procname = "accept_ra_rt_info_max_plen",
6830 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6831 .maxlen = sizeof(int),
6832 .mode = 0644,
6833 .proc_handler = proc_dointvec,
6834 },
09c884d4 6835#endif
930d6ff2 6836#endif
5df1f77f
KK		 6837 {
6838 .procname = "proxy_ndp",
6839 .data = &ipv6_devconf.proxy_ndp,
6840 .maxlen = sizeof(int),
6841 .mode = 0644,
6842 .proc_handler = addrconf_sysctl_proxy_ndp,
6843 },
6844 {
6845 .procname = "accept_source_route",
6846 .data = &ipv6_devconf.accept_source_route,
6847 .maxlen = sizeof(int),
6848 .mode = 0644,
6849 .proc_handler = proc_dointvec,
6850 },
95c385b4 6851#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 6852 {
6853 .procname = "optimistic_dad",
6854 .data = &ipv6_devconf.optimistic_dad,
6855 .maxlen = sizeof(int),
6856 .mode = 0644,
6857 .proc_handler = proc_dointvec,
6858 },
6859 {
6860 .procname = "use_optimistic",
6861 .data = &ipv6_devconf.use_optimistic,
6862 .maxlen = sizeof(int),
6863 .mode = 0644,
6864 .proc_handler = proc_dointvec,
6865 },
7bc570c8
YH		 6866#endif
6867#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 6868 {
6869 .procname = "mc_forwarding",
6870 .data = &ipv6_devconf.mc_forwarding,
6871 .maxlen = sizeof(int),
6872 .mode = 0444,
6873 .proc_handler = proc_dointvec,
6874 },
95c385b4 6875#endif
5df1f77f
KK		 6876 {
6877 .procname = "disable_ipv6",
6878 .data = &ipv6_devconf.disable_ipv6,
6879 .maxlen = sizeof(int),
6880 .mode = 0644,
6881 .proc_handler = addrconf_sysctl_disable,
6882 },
6883 {
6884 .procname = "accept_dad",
6885 .data = &ipv6_devconf.accept_dad,
6886 .maxlen = sizeof(int),
6887 .mode = 0644,
6888 .proc_handler = proc_dointvec,
6889 },
6890 {
6891 .procname = "force_tllao",
6892 .data = &ipv6_devconf.force_tllao,
6893 .maxlen = sizeof(int),
6894 .mode = 0644,
6895 .proc_handler = proc_dointvec
6896 },
6897 {
6898 .procname = "ndisc_notify",
6899 .data = &ipv6_devconf.ndisc_notify,
6900 .maxlen = sizeof(int),
6901 .mode = 0644,
6902 .proc_handler = proc_dointvec
6903 },
6904 {
6905 .procname = "suppress_frag_ndisc",
6906 .data = &ipv6_devconf.suppress_frag_ndisc,
6907 .maxlen = sizeof(int),
6908 .mode = 0644,
6909 .proc_handler = proc_dointvec
6910 },
6911 {
6912 .procname = "accept_ra_from_local",
6913 .data = &ipv6_devconf.accept_ra_from_local,
6914 .maxlen = sizeof(int),
6915 .mode = 0644,
6916 .proc_handler = proc_dointvec,
6917 },
6918 {
6919 .procname = "accept_ra_mtu",
6920 .data = &ipv6_devconf.accept_ra_mtu,
6921 .maxlen = sizeof(int),
6922 .mode = 0644,
6923 .proc_handler = proc_dointvec,
6924 },
6925 {
6926 .procname = "stable_secret",
6927 .data = &ipv6_devconf.stable_secret,
6928 .maxlen = IPV6_MAX_STRLEN,
6929 .mode = 0600,
6930 .proc_handler = addrconf_sysctl_stable_secret,
6931 },
6932 {
6933 .procname = "use_oif_addrs_only",
6934 .data = &ipv6_devconf.use_oif_addrs_only,
6935 .maxlen = sizeof(int),
6936 .mode = 0644,
6937 .proc_handler = proc_dointvec,
6938 },
6939 {
6940 .procname = "ignore_routes_with_linkdown",
6941 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6942 .maxlen = sizeof(int),
6943 .mode = 0644,
6944 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6945 },
6946 {
6947 .procname = "drop_unicast_in_l2_multicast",
6948 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6949 .maxlen = sizeof(int),
6950 .mode = 0644,
6951 .proc_handler = proc_dointvec,
6952 },
6953 {
6954 .procname = "drop_unsolicited_na",
6955 .data = &ipv6_devconf.drop_unsolicited_na,
6956 .maxlen = sizeof(int),
6957 .mode = 0644,
6958 .proc_handler = proc_dointvec,
6959 },
6960 {
6961 .procname = "keep_addr_on_down",
6962 .data = &ipv6_devconf.keep_addr_on_down,
6963 .maxlen = sizeof(int),
6964 .mode = 0644,
6965 .proc_handler = proc_dointvec,
6966
6967 },
1ababeba
DL		 6968 {
6969 .procname = "seg6_enabled",
6970 .data = &ipv6_devconf.seg6_enabled,
6971 .maxlen = sizeof(int),
6972 .mode = 0644,
6973 .proc_handler = proc_dointvec,
6974 },
bf355b8d
DL		 6975#ifdef CONFIG_IPV6_SEG6_HMAC
6976 {
6977 .procname = "seg6_require_hmac",
6978 .data = &ipv6_devconf.seg6_require_hmac,
6979 .maxlen = sizeof(int),
6980 .mode = 0644,
6981 .proc_handler = proc_dointvec,
6982 },
6983#endif
adc176c5
EN		 6984 {
6985 .procname = "enhanced_dad",
6986 .data = &ipv6_devconf.enhanced_dad,
6987 .maxlen = sizeof(int),
6988 .mode = 0644,
6989 .proc_handler = proc_dointvec,
6990 },
d35a00b8 6991 {
12e64b3b
RY		 6992 .procname = "addr_gen_mode",
6993 .data = &ipv6_devconf.addr_gen_mode,
6994 .maxlen = sizeof(int),
6995 .mode = 0644,
d35a00b8
FJ		 6996 .proc_handler = addrconf_sysctl_addr_gen_mode,
6997 },
df789fe7
DF		 6998 {
6999 .procname = "disable_policy",
7000 .data = &ipv6_devconf.disable_policy,
7001 .maxlen = sizeof(int),
7002 .mode = 0644,
7003 .proc_handler = addrconf_sysctl_disable_policy,
7004 },
2210d6b2
MŻ		 7005 {
7006 .procname = "ndisc_tclass",
7007 .data = &ipv6_devconf.ndisc_tclass,
7008 .maxlen = sizeof(int),
7009 .mode = 0644,
7010 .proc_handler = proc_dointvec_minmax,
eec4844f 7011 .extra1 = (void *)SYSCTL_ZERO,
2210d6b2
MŻ		 7012 .extra2 = (void *)&two_five_five,
7013 },
8610c7c6
AA		 7014 {
7015 .procname = "rpl_seg_enabled",
7016 .data = &ipv6_devconf.rpl_seg_enabled,
7017 .maxlen = sizeof(int),
7018 .mode = 0644,
7019 .proc_handler = proc_dointvec,
7020 },
9ee11f0f
JI		 7021 {
7022 .procname = "ioam6_enabled",
7023 .data = &ipv6_devconf.ioam6_enabled,
7024 .maxlen = sizeof(u8),
7025 .mode = 0644,
7026 .proc_handler = proc_dou8vec_minmax,
7027 .extra1 = (void *)SYSCTL_ZERO,
7028 .extra2 = (void *)SYSCTL_ONE,
7029 },
7030 {
7031 .procname = "ioam6_id",
7032 .data = &ipv6_devconf.ioam6_id,
7033 .maxlen = sizeof(u32),
7034 .mode = 0644,
7035 .proc_handler = proc_douintvec_minmax,
7036 .extra1 = (void *)SYSCTL_ZERO,
7037 .extra2 = (void *)&ioam6_if_id_max,
7038 },
7039 {
7040 .procname = "ioam6_id_wide",
7041 .data = &ipv6_devconf.ioam6_id_wide,
7042 .maxlen = sizeof(u32),
7043 .mode = 0644,
7044 .proc_handler = proc_douintvec,
7045 },
18ac597a
JP		 7046 {
7047 .procname = "ndisc_evict_nocarrier",
7048 .data = &ipv6_devconf.ndisc_evict_nocarrier,
7049 .maxlen = sizeof(u8),
7050 .mode = 0644,
7051 .proc_handler = proc_dou8vec_minmax,
7052 .extra1 = (void *)SYSCTL_ZERO,
7053 .extra2 = (void *)SYSCTL_ONE,
7054 },
f9a2fb73 7055 {
3e0b8f52
AA		 7056 .procname = "accept_untracked_na",
7057 .data = &ipv6_devconf.accept_untracked_na,
f9a2fb73
AA		 7058 .maxlen = sizeof(int),
7059 .mode = 0644,
b66eb3a6
JP		 7060 .proc_handler = proc_dointvec_minmax,
7061 .extra1 = SYSCTL_ZERO,
7062 .extra2 = SYSCTL_TWO,
f9a2fb73 7063 },
5df1f77f
KK		 7064 {
7065 /* sentinel */
7066 }
1da177e4
LT		 7067};
7068
bff16c2f 7069static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 7070 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4 7071{
29c994e3 7072 int i, ifindex;
607ea7cd 7073 struct ctl_table *table;
6105e293 7074 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 7075
425b9c7f 7076 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT);
607ea7cd 7077 if (!table)
f68635e6
PE		 7078 goto out;
7079
607ea7cd
KK		 7080 for (i = 0; table[i].data; i++) {
7081 table[i].data += (char *)p - (char *)&ipv6_devconf;
cb9e684e
MŻ		 7082 /* If one of these is already set, then it is not safe to
7083 * overwrite either of them: this makes proc_dointvec_minmax
7084 * usable.
7085 */
7086 if (!table[i].extra1 && !table[i].extra2) {
7087 table[i].extra1 = idev; /* embedded; no ref */
7088 table[i].extra2 = net;
7089 }
1da177e4 7090 }
1da177e4 7091
6105e293 7092 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 7093
607ea7cd
KK		 7094 p->sysctl_header = register_net_sysctl(net, path, table);
7095 if (!p->sysctl_header)
6105e293 7096 goto free;
f68635e6 7097
29c994e3
ND		 7098 if (!strcmp(dev_name, "all"))
7099 ifindex = NETCONFA_IFINDEX_ALL;
7100 else if (!strcmp(dev_name, "default"))
7101 ifindex = NETCONFA_IFINDEX_DEFAULT;
7102 else
7103 ifindex = idev->dev->ifindex;
85b3daad
DA		 7104 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
7105 ifindex, p);
95897312 7106 return 0;
1da177e4 7107
f68635e6 7108free:
607ea7cd 7109 kfree(table);
f68635e6 7110out:
95897312 7111 return -ENOBUFS;
1da177e4
LT		 7112}
7113
23452170
DA		 7114static void __addrconf_sysctl_unregister(struct net *net,
7115 struct ipv6_devconf *p, int ifindex)
408c4768 7116{
607ea7cd 7117 struct ctl_table *table;
408c4768 7118
607ea7cd 7119 if (!p->sysctl_header)
408c4768
PE		 7120 return;
7121
607ea7cd
KK		 7122 table = p->sysctl_header->ctl_table_arg;
7123 unregister_net_sysctl_table(p->sysctl_header);
7124 p->sysctl_header = NULL;
7125 kfree(table);
23452170
DA		 7126
7127 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
408c4768
PE		 7128}
7129
a317a2f1 7130static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 7131{
a317a2f1
WC		 7132 int err;
7133
7134 if (!sysctl_dev_name_is_allowed(idev->dev->name))
7135 return -EINVAL;
7136
7137 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
7138 &ndisc_ifinfo_sysctl_change);
7139 if (err)
7140 return err;
7141 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
7142 idev, &idev->cnf);
7143 if (err)
7144 neigh_sysctl_unregister(idev->nd_parms);
7145
7146 return err;
f52295a9
PE		 7147}
7148
408c4768 7149static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 7150{
23452170
DA		 7151 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
7152 idev->dev->ifindex);
408c4768 7153 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 7154}
7155
7156
7157#endif
7158
2c8c1e72 7159static int __net_init addrconf_init_net(struct net *net)
e0da5a48 7160{
a79ca223 7161 int err = -ENOMEM;
e0da5a48
PE		 7162 struct ipv6_devconf *all, *dflt;
7163
21a216a8 7164 spin_lock_init(&net->ipv6.addrconf_hash_lock);
8805d13f 7165 INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work);
21a216a8
ED		 7166 net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE,
7167 sizeof(struct hlist_head),
7168 GFP_KERNEL);
7169 if (!net->ipv6.inet6_addr_lst)
7170 goto err_alloc_addr;
7171
a79ca223 7172 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 7173 if (!all)
a79ca223 7174 goto err_alloc_all;
e0da5a48 7175
a79ca223 7176 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 7177 if (!dflt)
a79ca223 7178 goto err_alloc_dflt;
e0da5a48 7179
a5612ca1
KI		 7180 if (!net_eq(net, &init_net)) {
7181 switch (net_inherit_devconf()) {
9efd6a3c
ND		 7182 case 1: /* copy from init_net */
7183 memcpy(all, init_net.ipv6.devconf_all,
7184 sizeof(ipv6_devconf));
7185 memcpy(dflt, init_net.ipv6.devconf_dflt,
7186 sizeof(ipv6_devconf_dflt));
7187 break;
7188 case 3: /* copy from the current netns */
7189 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all,
7190 sizeof(ipv6_devconf));
7191 memcpy(dflt,
7192 current->nsproxy->net_ns->ipv6.devconf_dflt,
7193 sizeof(ipv6_devconf_dflt));
7194 break;
7195 case 0:
7196 case 2:
7197 /* use compiled values */
7198 break;
7199 }
856c395c
CW		 7200 }
7201
a79ca223
HZ		 7202 /* these will be inherited by all namespaces */
7203 dflt->autoconf = ipv6_defaults.autoconf;
7204 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 7205
3d1bec99
HFS		 7206 dflt->stable_secret.initialized = false;
7207 all->stable_secret.initialized = false;
7208
e0da5a48
PE		 7209 net->ipv6.devconf_all = all;
7210 net->ipv6.devconf_dflt = dflt;
7211
7212#ifdef CONFIG_SYSCTL
f8572d8f 7213 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 7214 if (err < 0)
7215 goto err_reg_all;
7216
f8572d8f 7217 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 7218 if (err < 0)
7219 goto err_reg_dflt;
7220#endif
7221 return 0;
7222
7223#ifdef CONFIG_SYSCTL
7224err_reg_dflt:
23452170 7225 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
e0da5a48
PE		 7226err_reg_all:
7227 kfree(dflt);
1ca69520 7228 net->ipv6.devconf_dflt = NULL;
e0da5a48
PE		 7229#endif
7230err_alloc_dflt:
7231 kfree(all);
1ca69520 7232 net->ipv6.devconf_all = NULL;
e0da5a48 7233err_alloc_all:
21a216a8
ED		 7234 kfree(net->ipv6.inet6_addr_lst);
7235err_alloc_addr:
e0da5a48
PE		 7236 return err;
7237}
7238
2c8c1e72 7239static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48 7240{
21a216a8
ED		 7241 int i;
7242
e0da5a48 7243#ifdef CONFIG_SYSCTL
23452170
DA		 7244 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7245 NETCONFA_IFINDEX_DEFAULT);
7246 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7247 NETCONFA_IFINDEX_ALL);
e0da5a48 7248#endif
73cf0e92 7249 kfree(net->ipv6.devconf_dflt);
7d9b1b57 7250 net->ipv6.devconf_dflt = NULL;
73cf0e92 7251 kfree(net->ipv6.devconf_all);
7d9b1b57 7252 net->ipv6.devconf_all = NULL;
21a216a8 7253
be6b41c1 7254 cancel_delayed_work_sync(&net->ipv6.addr_chk_work);
21a216a8
ED		 7255 /*
7256 * Check hash table, then free it.
7257 */
7258 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7259 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i]));
7260
7261 kfree(net->ipv6.inet6_addr_lst);
7262 net->ipv6.inet6_addr_lst = NULL;
e0da5a48
PE		 7263}
7264
7265static struct pernet_operations addrconf_ops = {
7266 .init = addrconf_init_net,
7267 .exit = addrconf_exit_net,
7268};
7269
207895fd 7270static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 7271 .family = AF_INET6,
7272 .fill_link_af = inet6_fill_link_af,
7273 .get_link_af_size = inet6_get_link_af_size,
11b1f828 7274 .validate_link_af = inet6_validate_link_af,
f53adae4 7275 .set_link_af = inet6_set_link_af,
b382b191
TG		 7276};
7277
1da177e4
LT		 7278/*
7279 * Init / cleanup code
7280 */
7281
7282int __init addrconf_init(void)
7283{
a317a2f1 7284 struct inet6_dev *idev;
e66d1172 7285 int err;
2a8cc6c8 7286
e21e8467
SH		 7287 err = ipv6_addr_label_init();
7288 if (err < 0) {
f3213831
JP		 7289 pr_crit("%s: cannot initialize default policy table: %d\n",
7290 __func__, err);
2cc6d2bf 7291 goto out;
2a8cc6c8 7292 }
1da177e4 7293
2cc6d2bf
NH		 7294 err = register_pernet_subsys(&addrconf_ops);
7295 if (err < 0)
7296 goto out_addrlabel;
e0da5a48 7297
c15b1cca
HFS		 7298 addrconf_wq = create_workqueue("ipv6_addrconf");
7299 if (!addrconf_wq) {
7300 err = -ENOMEM;
7301 goto out_nowq;
7302 }
7303
1da177e4 7304 rtnl_lock();
e5f80fcf 7305 idev = ipv6_add_dev(blackhole_netdev);
1da177e4 7306 rtnl_unlock();
a317a2f1
WC		 7307 if (IS_ERR(idev)) {
7308 err = PTR_ERR(idev);
e0da5a48 7309 goto errlo;
a317a2f1 7310 }
1da177e4 7311
2f460933
WC		 7312 ip6_route_init_special_entries();
7313
1da177e4
LT		 7314 register_netdevice_notifier(&ipv6_dev_notf);
7315
8805d13f 7316 addrconf_verify(&init_net);
c127ea2c 7317
3678a9d8 7318 rtnl_af_register(&inet6_ops);
b382b191 7319
16feebcf
FW		 7320 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7321 NULL, inet6_dump_ifinfo, 0);
c127ea2c
TG		 7322 if (err < 0)
7323 goto errout;
7324
16feebcf
FW		 7325 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7326 inet6_rtm_newaddr, NULL, 0);
7327 if (err < 0)
7328 goto errout;
7329 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7330 inet6_rtm_deladdr, NULL, 0);
7331 if (err < 0)
7332 goto errout;
7333 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7334 inet6_rtm_getaddr, inet6_dump_ifaddr,
7335 RTNL_FLAG_DOIT_UNLOCKED);
7336 if (err < 0)
7337 goto errout;
7338 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7339 NULL, inet6_dump_ifmcaddr, 0);
7340 if (err < 0)
7341 goto errout;
7342 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7343 NULL, inet6_dump_ifacaddr, 0);
7344 if (err < 0)
7345 goto errout;
7346 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7347 inet6_netconf_get_devconf,
7348 inet6_netconf_dump_devconf,
7349 RTNL_FLAG_DOIT_UNLOCKED);
7350 if (err < 0)
7351 goto errout;
a3fde2ad
FW		 7352 err = ipv6_addr_label_rtnl_register();
7353 if (err < 0)
7354 goto errout;
2a8cc6c8 7355
1da177e4 7356 return 0;
c127ea2c 7357errout:
16feebcf 7358 rtnl_unregister_all(PF_INET6);
b382b191 7359 rtnl_af_unregister(&inet6_ops);
c127ea2c 7360 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 7361errlo:
c15b1cca
HFS		 7362 destroy_workqueue(addrconf_wq);
7363out_nowq:
e0da5a48 7364 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 7365out_addrlabel:
7366 ipv6_addr_label_cleanup();
7367out:
c127ea2c 7368 return err;
1da177e4
LT		 7369}
7370
09f7709f 7371void addrconf_cleanup(void)
1da177e4 7372{
176c39af 7373 struct net_device *dev;
1da177e4
LT		 7374
7375 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 7376 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 7377 ipv6_addr_label_cleanup();
1da177e4 7378
5c45121d 7379 rtnl_af_unregister(&inet6_ops);
1da177e4 7380
5c45121d 7381 rtnl_lock();
b382b191 7382
176c39af
DL		 7383 /* clean dev list */
7384 for_each_netdev(&init_net, dev) {
7385 if (__in6_dev_get(dev) == NULL)
7386 continue;
ae79dbf6 7387 addrconf_ifdown(dev, true);
176c39af 7388 }
ae79dbf6 7389 addrconf_ifdown(init_net.loopback_dev, true);
176c39af 7390
1da177e4 7391 rtnl_unlock();
c15b1cca
HFS		 7392
7393 destroy_workqueue(addrconf_wq);
1da177e4 7394}
Linux 6.x block layer and io_uring tree(s)