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net: phy: allow for reset line to be tied to a sleepy GPIO controller
[linux-block.git] / net / ipv6 / addrconf.c
CommitLineData
2874c5fd 1// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4
LT		 2/*
3 * IPv6 Address [auto]configuration
4 * Linux INET6 implementation
5 *
6 * Authors:
1ab1457c 7 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4 8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
1da177e4
LT		 9 */
10
11/*
12 * Changes:
13 *
14 * Janos Farkas : delete timer on ifdown
15 * <chexum@bankinf.banki.hu>
16 * Andi Kleen : kill double kfree on module
17 * unload.
18 * Maciej W. Rozycki : FDDI support
19 * sekiya@USAGI : Don't send too many RS
20 * packets.
21 * yoshfuji@USAGI : Fixed interval between DAD
22 * packets.
23 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
24 * address validation timer.
25 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
26 * support.
27 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
28 * address on a same interface.
29 * YOSHIFUJI Hideaki @USAGI : ARCnet support
30 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
31 * seq_file.
b1cacb68
YH		 32 * YOSHIFUJI Hideaki @USAGI : improved source address
33 * selection; consider scope,
34 * status etc.
1da177e4
LT		 35 */
36
f3213831
JP		 37#define pr_fmt(fmt) "IPv6: " fmt
38
1da177e4
LT		 39#include <linux/errno.h>
40#include <linux/types.h>
a0bffffc 41#include <linux/kernel.h>
174cd4b1 42#include <linux/sched/signal.h>
1da177e4
LT		 43#include <linux/socket.h>
44#include <linux/sockios.h>
1da177e4 45#include <linux/net.h>
3d1bec99 46#include <linux/inet.h>
1da177e4
LT		 47#include <linux/in6.h>
48#include <linux/netdevice.h>
1823730f 49#include <linux/if_addr.h>
1da177e4
LT		 50#include <linux/if_arp.h>
51#include <linux/if_arcnet.h>
52#include <linux/if_infiniband.h>
53#include <linux/route.h>
54#include <linux/inetdevice.h>
55#include <linux/init.h>
5a0e3ad6 56#include <linux/slab.h>
1da177e4
LT		 57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
4fc268d2 60#include <linux/capability.h>
1da177e4
LT		 61#include <linux/delay.h>
62#include <linux/notifier.h>
543537bd 63#include <linux/string.h>
ddbe5032 64#include <linux/hash.h>
1da177e4 65
457c4cbc 66#include <net/net_namespace.h>
1da177e4
LT		 67#include <net/sock.h>
68#include <net/snmp.h>
69
5241c2d7 70#include <net/6lowpan.h>
cb6bf355 71#include <net/firewire.h>
1da177e4
LT		 72#include <net/ipv6.h>
73#include <net/protocol.h>
74#include <net/ndisc.h>
75#include <net/ip6_route.h>
76#include <net/addrconf.h>
77#include <net/tcp.h>
78#include <net/ip.h>
5d620266 79#include <net/netlink.h>
f24e3d65 80#include <net/pkt_sched.h>
ca254490 81#include <net/l3mdev.h>
1da177e4
LT		 82#include <linux/if_tunnel.h>
83#include <linux/rtnetlink.h>
f3a1bfb1 84#include <linux/netconf.h>
1da177e4 85#include <linux/random.h>
e21e8467 86#include <linux/uaccess.h>
7f7d9a6b 87#include <asm/unaligned.h>
1da177e4
LT		 88
89#include <linux/proc_fs.h>
90#include <linux/seq_file.h>
bc3b2d7f 91#include <linux/export.h>
1da177e4 92
1da177e4 93#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e 94
3d1bec99
HFS		 95#define IPV6_MAX_STRLEN \
96 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
97
18a31e1e
TG		 98static inline u32 cstamp_delta(unsigned long cstamp)
99{
100 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
101}
1da177e4 102
bd11f074
MŻ		 103static inline s32 rfc3315_s14_backoff_init(s32 irt)
104{
105 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
106 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
107 do_div(tmp, 1000000);
108 return (s32)tmp;
109}
110
111static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
112{
113 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
114 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
115 do_div(tmp, 1000000);
116 if ((s32)tmp > mrt) {
117 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
118 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
119 do_div(tmp, 1000000);
120 }
121 return (s32)tmp;
122}
123
1da177e4 124#ifdef CONFIG_SYSCTL
a317a2f1 125static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 126static void addrconf_sysctl_unregister(struct inet6_dev *idev);
127#else
a317a2f1 128static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 129{
a317a2f1 130 return 0;
408c4768
PE		 131}
132
133static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
134{
135}
1da177e4
LT		 136#endif
137
9d6280da
JB		 138static void ipv6_regen_rndid(struct inet6_dev *idev);
139static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 140
1b34be74 141static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
d9bf82c2 142static int ipv6_count_addresses(const struct inet6_dev *idev);
622c81d5
HFS		 143static int ipv6_generate_stable_address(struct in6_addr *addr,
144 u8 dad_count,
145 const struct inet6_dev *idev);
1da177e4 146
27c565ae
ED		 147#define IN6_ADDR_HSIZE_SHIFT 8
148#define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
1da177e4
LT		 149/*
150 * Configured unicast address hash table
151 */
c2e21293 152static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 153static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 154
c15b1cca
HFS		 155static void addrconf_verify(void);
156static void addrconf_verify_rtnl(void);
157static void addrconf_verify_work(struct work_struct *);
1da177e4 158
c15b1cca
HFS		 159static struct workqueue_struct *addrconf_wq;
160static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 161
162static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
163static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
164
93d9b7d7
JP		 165static void addrconf_type_change(struct net_device *dev,
166 unsigned long event);
1da177e4
LT		 167static int addrconf_ifdown(struct net_device *dev, int how);
168
8d1c802b 169static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
21caa662
RK		 170 int plen,
171 const struct net_device *dev,
2b2450ca
DA		 172 u32 flags, u32 noflags,
173 bool no_gw);
21caa662 174
cf22f9a2 175static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 176static void addrconf_dad_work(struct work_struct *w);
c76fe2d9
DA		 177static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
178 bool send_na);
896585d4 179static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
e99e88a9 180static void addrconf_rs_timer(struct timer_list *t);
1da177e4
LT		 181static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
182static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
183
1ab1457c 184static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 185 struct prefix_info *pinfo);
1da177e4 186
888c848e 187static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 188 .forwarding = 0,
189 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
190 .mtu6 = IPV6_MIN_MTU,
191 .accept_ra = 1,
192 .accept_redirects = 1,
193 .autoconf = 1,
194 .force_mld_version = 0,
fc4eba58
HFS		 195 .mldv1_unsolicited_report_interval = 10 * HZ,
196 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 197 .dad_transmits = 1,
198 .rtr_solicits = MAX_RTR_SOLICITATIONS,
199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 200 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 201 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 202 .use_tempaddr = 0,
1da177e4
LT		 203 .temp_valid_lft = TEMP_VALID_LIFETIME,
204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
205 .regen_max_retry = REGEN_MAX_RETRY,
206 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 207 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 208 .accept_ra_defrtr = 1,
d9333196 209 .accept_ra_from_local = 0,
8013d1d7 210 .accept_ra_min_hop_limit= 1,
c4fd30eb 211 .accept_ra_pinfo = 1,
930d6ff2
YH		 212#ifdef CONFIG_IPV6_ROUTER_PREF
213 .accept_ra_rtr_pref = 1,
52e16356 214 .rtr_probe_interval = 60 * HZ,
09c884d4 215#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 216 .accept_ra_rt_info_min_plen = 0,
09c884d4
YH		 217 .accept_ra_rt_info_max_plen = 0,
218#endif
930d6ff2 219#endif
fbea49e1 220 .proxy_ndp = 0,
0bcbc926 221 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 222 .disable_ipv6 = 0,
09400953 223 .accept_dad = 0,
b800c3b9 224 .suppress_frag_ndisc = 1,
c2943f14 225 .accept_ra_mtu = 1,
3d1bec99
HFS		 226 .stable_secret = {
227 .initialized = false,
3985e8a3
EK		 228 },
229 .use_oif_addrs_only = 0,
35103d11 230 .ignore_routes_with_linkdown = 0,
f1705ec1 231 .keep_addr_on_down = 0,
1ababeba 232 .seg6_enabled = 0,
bf355b8d
DL		 233#ifdef CONFIG_IPV6_SEG6_HMAC
234 .seg6_require_hmac = 0,
235#endif
adc176c5 236 .enhanced_dad = 1,
d35a00b8 237 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
df789fe7 238 .disable_policy = 0,
1da177e4
LT		 239};
240
ab32ea5d 241static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 242 .forwarding = 0,
243 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
244 .mtu6 = IPV6_MIN_MTU,
245 .accept_ra = 1,
246 .accept_redirects = 1,
247 .autoconf = 1,
fc4eba58
HFS		 248 .force_mld_version = 0,
249 .mldv1_unsolicited_report_interval = 10 * HZ,
250 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 251 .dad_transmits = 1,
252 .rtr_solicits = MAX_RTR_SOLICITATIONS,
253 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 254 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 255 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 256 .use_tempaddr = 0,
257 .temp_valid_lft = TEMP_VALID_LIFETIME,
258 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
259 .regen_max_retry = REGEN_MAX_RETRY,
260 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 261 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 262 .accept_ra_defrtr = 1,
d9333196 263 .accept_ra_from_local = 0,
8013d1d7 264 .accept_ra_min_hop_limit= 1,
c4fd30eb 265 .accept_ra_pinfo = 1,
930d6ff2
YH		 266#ifdef CONFIG_IPV6_ROUTER_PREF
267 .accept_ra_rtr_pref = 1,
52e16356 268 .rtr_probe_interval = 60 * HZ,
09c884d4 269#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 270 .accept_ra_rt_info_min_plen = 0,
09c884d4
YH		 271 .accept_ra_rt_info_max_plen = 0,
272#endif
930d6ff2 273#endif
fbea49e1 274 .proxy_ndp = 0,
0bcbc926 275 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 276 .disable_ipv6 = 0,
1b34be74 277 .accept_dad = 1,
b800c3b9 278 .suppress_frag_ndisc = 1,
c2943f14 279 .accept_ra_mtu = 1,
3d1bec99
HFS		 280 .stable_secret = {
281 .initialized = false,
282 },
3985e8a3 283 .use_oif_addrs_only = 0,
35103d11 284 .ignore_routes_with_linkdown = 0,
f1705ec1 285 .keep_addr_on_down = 0,
1ababeba 286 .seg6_enabled = 0,
bf355b8d
DL		 287#ifdef CONFIG_IPV6_SEG6_HMAC
288 .seg6_require_hmac = 0,
289#endif
adc176c5 290 .enhanced_dad = 1,
d35a00b8 291 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
df789fe7 292 .disable_policy = 0,
1da177e4
LT		 293};
294
1f372c7b
MM		 295/* Check if link is ready: is it up and is a valid qdisc available */
296static inline bool addrconf_link_ready(const struct net_device *dev)
f24e3d65 297{
1f372c7b 298 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
f24e3d65
MC		 299}
300
b7b1bfce 301static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 302{
b7b1bfce
HFS		 303 if (del_timer(&idev->rs_timer))
304 __in6_dev_put(idev);
305}
306
c15b1cca 307static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 308{
c15b1cca 309 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 310 __in6_ifa_put(ifp);
311}
312
b7b1bfce
HFS		 313static void addrconf_mod_rs_timer(struct inet6_dev *idev,
314 unsigned long when)
315{
316 if (!timer_pending(&idev->rs_timer))
317 in6_dev_hold(idev);
318 mod_timer(&idev->rs_timer, jiffies + when);
319}
1da177e4 320
c15b1cca
HFS		 321static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
322 unsigned long delay)
1da177e4 323{
f8a894b2
XL		 324 in6_ifa_hold(ifp);
325 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
326 in6_ifa_put(ifp);
1da177e4
LT		 327}
328
7f7d9a6b
HX		 329static int snmp6_alloc_dev(struct inet6_dev *idev)
330{
827da44c
JS		 331 int i;
332
698365fa
WC		 333 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
334 if (!idev->stats.ipv6)
7f7d9a6b 335 goto err_ip;
827da44c
JS		 336
337 for_each_possible_cpu(i) {
338 struct ipstats_mib *addrconf_stats;
698365fa 339 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 340 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 341 }
342
343
be281e55
ED		 344 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
345 GFP_KERNEL);
346 if (!idev->stats.icmpv6dev)
7f7d9a6b 347 goto err_icmp;
be281e55
ED		 348 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
349 GFP_KERNEL);
350 if (!idev->stats.icmpv6msgdev)
14878f75 351 goto err_icmpmsg;
7f7d9a6b
HX		 352
353 return 0;
354
14878f75 355err_icmpmsg:
be281e55 356 kfree(idev->stats.icmpv6dev);
7f7d9a6b 357err_icmp:
698365fa 358 free_percpu(idev->stats.ipv6);
7f7d9a6b 359err_ip:
aaf70ec7 360 return -ENOMEM;
7f7d9a6b
HX		 361}
362
8e5e8f30 363static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 364{
365 struct inet6_dev *ndev;
a317a2f1 366 int err = -ENOMEM;
1da177e4
LT		 367
368 ASSERT_RTNL();
369
370 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 371 return ERR_PTR(-EINVAL);
1da177e4 372
1ab1457c 373 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
63159f29 374 if (!ndev)
a317a2f1 375 return ERR_PTR(err);
322f74a4
IO		 376
377 rwlock_init(&ndev->lock);
378 ndev->dev = dev;
502a2ffd 379 INIT_LIST_HEAD(&ndev->addr_list);
e99e88a9 380 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
c346dca1 381 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
9b29c696
HFS		 382
383 if (ndev->cnf.stable_secret.initialized)
d35a00b8 384 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
9b29c696 385
322f74a4 386 ndev->cnf.mtu6 = dev->mtu;
322f74a4 387 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
63159f29 388 if (!ndev->nd_parms) {
322f74a4 389 kfree(ndev);
a317a2f1 390 return ERR_PTR(err);
322f74a4 391 }
0187bdfb
BH		 392 if (ndev->cnf.forwarding)
393 dev_disable_lro(dev);
322f74a4
IO		 394 /* We refer to the device */
395 dev_hold(dev);
1da177e4 396
322f74a4 397 if (snmp6_alloc_dev(ndev) < 0) {
e32ac250
JP		 398 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
399 __func__);
322f74a4 400 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 401 dev_put(dev);
402 kfree(ndev);
a317a2f1 403 return ERR_PTR(err);
322f74a4 404 }
1da177e4 405
322f74a4 406 if (snmp6_register_dev(ndev) < 0) {
e32ac250
JP		 407 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
408 __func__, dev->name);
a317a2f1 409 goto err_release;
322f74a4
IO		 410 }
411
9d6280da 412 /* One reference from device. */
1be92460 413 refcount_set(&ndev->refcnt, 1);
1da177e4 414
1b34be74
YH		 415 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
416 ndev->cnf.accept_dad = -1;
417
07a93626 418#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 419 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 420 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 421 ndev->cnf.rtr_solicits = 0;
422 }
423#endif
424
372e6c8f 425 INIT_LIST_HEAD(&ndev->tempaddr_list);
76506a98 426 ndev->desync_factor = U32_MAX;
322f74a4
IO		 427 if ((dev->flags&IFF_LOOPBACK) ||
428 dev->type == ARPHRD_TUNNEL ||
9625ed72 429 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 430 dev->type == ARPHRD_SIT ||
0be669bb 431 dev->type == ARPHRD_NONE) {
322f74a4 432 ndev->cnf.use_tempaddr = -1;
9d6280da
JB		 433 } else
434 ipv6_regen_rndid(ndev);
5d9efa7e 435
914faa14 436 ndev->token = in6addr_any;
1da177e4 437
1f372c7b 438 if (netif_running(dev) && addrconf_link_ready(dev))
53aadcc9
HX		 439 ndev->if_flags |= IF_READY;
440
322f74a4
IO		 441 ipv6_mc_init_dev(ndev);
442 ndev->tstamp = jiffies;
a317a2f1
WC		 443 err = addrconf_sysctl_register(ndev);
444 if (err) {
445 ipv6_mc_destroy_dev(ndev);
2a189f9e 446 snmp6_unregister_dev(ndev);
a317a2f1
WC		 447 goto err_release;
448 }
30c4cf57 449 /* protected by rtnl_lock */
cf778b00 450 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 451
2c5e8933
HFS		 452 /* Join interface-local all-node multicast group */
453 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
454
d88ae4cc 455 /* Join all-node multicast group */
f3ee4010 456 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 457
d6ddef9e 458 /* Join all-router multicast group if forwarding is set */
8b2aaede 459 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 460 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
461
1da177e4 462 return ndev;
a317a2f1
WC		 463
464err_release:
465 neigh_parms_release(&nd_tbl, ndev->nd_parms);
466 ndev->dead = 1;
467 in6_dev_finish_destroy(ndev);
468 return ERR_PTR(err);
1da177e4
LT		 469}
470
8e5e8f30 471static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 472{
473 struct inet6_dev *idev;
474
475 ASSERT_RTNL();
476
e21e8467
SH		 477 idev = __in6_dev_get(dev);
478 if (!idev) {
479 idev = ipv6_add_dev(dev);
a317a2f1 480 if (IS_ERR(idev))
db0b99f5 481 return idev;
1da177e4 482 }
c5e33bdd 483
1da177e4
LT		 484 if (dev->flags&IFF_UP)
485 ipv6_mc_up(idev);
486 return idev;
487}
488
f3a1bfb1
ND		 489static int inet6_netconf_msgsize_devconf(int type)
490{
491 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
492 + nla_total_size(4); /* NETCONFA_IFINDEX */
136ba622 493 bool all = false;
f3a1bfb1 494
136ba622
ZS		 495 if (type == NETCONFA_ALL)
496 all = true;
497
498 if (all || type == NETCONFA_FORWARDING)
f3a1bfb1 499 size += nla_total_size(4);
b1afce95 500#ifdef CONFIG_IPV6_MROUTE
136ba622 501 if (all || type == NETCONFA_MC_FORWARDING)
d67b8c61 502 size += nla_total_size(4);
b1afce95 503#endif
136ba622 504 if (all || type == NETCONFA_PROXY_NEIGH)
c92d5491 505 size += nla_total_size(4);
f3a1bfb1 506
136ba622 507 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
35103d11
AG		 508 size += nla_total_size(4);
509
f3a1bfb1
ND		 510 return size;
511}
512
513static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
514 struct ipv6_devconf *devconf, u32 portid,
515 u32 seq, int event, unsigned int flags,
516 int type)
517{
518 struct nlmsghdr *nlh;
519 struct netconfmsg *ncm;
136ba622 520 bool all = false;
f3a1bfb1
ND		 521
522 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
523 flags);
63159f29 524 if (!nlh)
f3a1bfb1
ND		 525 return -EMSGSIZE;
526
136ba622
ZS		 527 if (type == NETCONFA_ALL)
528 all = true;
529
f3a1bfb1
ND		 530 ncm = nlmsg_data(nlh);
531 ncm->ncm_family = AF_INET6;
532
533 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
534 goto nla_put_failure;
535
23452170
DA		 536 if (!devconf)
537 goto out;
538
136ba622 539 if ((all || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 540 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
541 goto nla_put_failure;
b1afce95 542#ifdef CONFIG_IPV6_MROUTE
136ba622 543 if ((all || type == NETCONFA_MC_FORWARDING) &&
d67b8c61
ND		 544 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
545 devconf->mc_forwarding) < 0)
546 goto nla_put_failure;
b1afce95 547#endif
136ba622 548 if ((all || type == NETCONFA_PROXY_NEIGH) &&
c92d5491 549 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
550 goto nla_put_failure;
551
136ba622 552 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
35103d11
AG		 553 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
554 devconf->ignore_routes_with_linkdown) < 0)
555 goto nla_put_failure;
556
23452170 557out:
053c095a
JB		 558 nlmsg_end(skb, nlh);
559 return 0;
f3a1bfb1
ND		 560
561nla_put_failure:
562 nlmsg_cancel(skb, nlh);
563 return -EMSGSIZE;
564}
565
85b3daad
DA		 566void inet6_netconf_notify_devconf(struct net *net, int event, int type,
567 int ifindex, struct ipv6_devconf *devconf)
f3a1bfb1
ND		 568{
569 struct sk_buff *skb;
570 int err = -ENOBUFS;
571
927265bc 572 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
63159f29 573 if (!skb)
f3a1bfb1
ND		 574 goto errout;
575
576 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
85b3daad 577 event, 0, type);
f3a1bfb1
ND		 578 if (err < 0) {
579 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
580 WARN_ON(err == -EMSGSIZE);
581 kfree_skb(skb);
582 goto errout;
583 }
927265bc 584 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
f3a1bfb1
ND		 585 return;
586errout:
bd779028 587 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 588}
589
76f8f6cb
ND		 590static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
591 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
592 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 593 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
35103d11 594 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
76f8f6cb
ND		 595};
596
38d51810
JK		 597static int inet6_netconf_valid_get_req(struct sk_buff *skb,
598 const struct nlmsghdr *nlh,
599 struct nlattr **tb,
600 struct netlink_ext_ack *extack)
601{
602 int i, err;
603
604 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
605 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
606 return -EINVAL;
607 }
608
609 if (!netlink_strict_get_check(skb))
8cb08174
JB		 610 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
611 tb, NETCONFA_MAX,
612 devconf_ipv6_policy, extack);
38d51810 613
8cb08174
JB		 614 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
615 tb, NETCONFA_MAX,
616 devconf_ipv6_policy, extack);
38d51810
JK		 617 if (err)
618 return err;
619
620 for (i = 0; i <= NETCONFA_MAX; i++) {
621 if (!tb[i])
622 continue;
623
624 switch (i) {
625 case NETCONFA_IFINDEX:
626 break;
627 default:
628 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
629 return -EINVAL;
630 }
631 }
632
633 return 0;
634}
635
76f8f6cb 636static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
c21ef3e3
DA		 637 struct nlmsghdr *nlh,
638 struct netlink_ext_ack *extack)
76f8f6cb
ND		 639{
640 struct net *net = sock_net(in_skb->sk);
641 struct nlattr *tb[NETCONFA_MAX+1];
4ea2607f
FW		 642 struct inet6_dev *in6_dev = NULL;
643 struct net_device *dev = NULL;
76f8f6cb
ND		 644 struct sk_buff *skb;
645 struct ipv6_devconf *devconf;
76f8f6cb
ND		 646 int ifindex;
647 int err;
648
38d51810 649 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
76f8f6cb 650 if (err < 0)
4ea2607f 651 return err;
76f8f6cb 652
76f8f6cb 653 if (!tb[NETCONFA_IFINDEX])
4ea2607f 654 return -EINVAL;
76f8f6cb 655
4ea2607f 656 err = -EINVAL;
76f8f6cb
ND		 657 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
658 switch (ifindex) {
659 case NETCONFA_IFINDEX_ALL:
660 devconf = net->ipv6.devconf_all;
661 break;
662 case NETCONFA_IFINDEX_DEFAULT:
663 devconf = net->ipv6.devconf_dflt;
664 break;
665 default:
4ea2607f 666 dev = dev_get_by_index(net, ifindex);
63159f29 667 if (!dev)
4ea2607f
FW		 668 return -EINVAL;
669 in6_dev = in6_dev_get(dev);
63159f29 670 if (!in6_dev)
76f8f6cb
ND		 671 goto errout;
672 devconf = &in6_dev->cnf;
673 break;
674 }
675
676 err = -ENOBUFS;
4ea2607f 677 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
63159f29 678 if (!skb)
76f8f6cb
ND		 679 goto errout;
680
681 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
682 NETLINK_CB(in_skb).portid,
683 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
136ba622 684 NETCONFA_ALL);
76f8f6cb
ND		 685 if (err < 0) {
686 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
687 WARN_ON(err == -EMSGSIZE);
688 kfree_skb(skb);
689 goto errout;
690 }
691 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
692errout:
4ea2607f
FW		 693 if (in6_dev)
694 in6_dev_put(in6_dev);
695 if (dev)
696 dev_put(dev);
76f8f6cb
ND		 697 return err;
698}
699
7a674200
ND		 700static int inet6_netconf_dump_devconf(struct sk_buff *skb,
701 struct netlink_callback *cb)
702{
addd383f 703 const struct nlmsghdr *nlh = cb->nlh;
7a674200
ND		 704 struct net *net = sock_net(skb->sk);
705 int h, s_h;
706 int idx, s_idx;
707 struct net_device *dev;
708 struct inet6_dev *idev;
709 struct hlist_head *head;
710
addd383f
DA		 711 if (cb->strict_check) {
712 struct netlink_ext_ack *extack = cb->extack;
713 struct netconfmsg *ncm;
714
715 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
716 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
717 return -EINVAL;
718 }
719
720 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
721 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
722 return -EINVAL;
723 }
724 }
725
7a674200
ND		 726 s_h = cb->args[0];
727 s_idx = idx = cb->args[1];
728
729 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
730 idx = 0;
731 head = &net->dev_index_head[h];
732 rcu_read_lock();
63998ac2
ND		 733 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
734 net->dev_base_seq;
7a674200
ND		 735 hlist_for_each_entry_rcu(dev, head, index_hlist) {
736 if (idx < s_idx)
737 goto cont;
738 idev = __in6_dev_get(dev);
739 if (!idev)
740 goto cont;
741
742 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
743 &idev->cnf,
744 NETLINK_CB(cb->skb).portid,
addd383f 745 nlh->nlmsg_seq,
7a674200
ND		 746 RTM_NEWNETCONF,
747 NLM_F_MULTI,
136ba622 748 NETCONFA_ALL) < 0) {
7a674200
ND		 749 rcu_read_unlock();
750 goto done;
751 }
63998ac2 752 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 753cont:
754 idx++;
755 }
756 rcu_read_unlock();
757 }
758 if (h == NETDEV_HASHENTRIES) {
759 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
760 net->ipv6.devconf_all,
761 NETLINK_CB(cb->skb).portid,
addd383f 762 nlh->nlmsg_seq,
7a674200 763 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 764 NETCONFA_ALL) < 0)
7a674200
ND		 765 goto done;
766 else
767 h++;
768 }
769 if (h == NETDEV_HASHENTRIES + 1) {
770 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
771 net->ipv6.devconf_dflt,
772 NETLINK_CB(cb->skb).portid,
addd383f 773 nlh->nlmsg_seq,
7a674200 774 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 775 NETCONFA_ALL) < 0)
7a674200
ND		 776 goto done;
777 else
778 h++;
779 }
780done:
781 cb->args[0] = h;
782 cb->args[1] = idx;
783
784 return skb->len;
785}
786
1da177e4
LT		 787#ifdef CONFIG_SYSCTL
788static void dev_forward_change(struct inet6_dev *idev)
789{
790 struct net_device *dev;
791 struct inet6_ifaddr *ifa;
1da177e4
LT		 792
793 if (!idev)
794 return;
795 dev = idev->dev;
0187bdfb
BH		 796 if (idev->cnf.forwarding)
797 dev_disable_lro(dev);
1a940835 798 if (dev->flags & IFF_MULTICAST) {
2c5e8933 799 if (idev->cnf.forwarding) {
f3ee4010 800 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 801 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
802 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
803 } else {
f3ee4010 804 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 805 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
806 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
807 }
1da177e4 808 }
502a2ffd 809
810 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 811 if (ifa->flags&IFA_F_TENTATIVE)
812 continue;
1da177e4
LT		 813 if (idev->cnf.forwarding)
814 addrconf_join_anycast(ifa);
815 else
816 addrconf_leave_anycast(ifa);
817 }
85b3daad
DA		 818 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
819 NETCONFA_FORWARDING,
f3a1bfb1 820 dev->ifindex, &idev->cnf);
1da177e4
LT		 821}
822
823
e186932b 824static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 825{
826 struct net_device *dev;
827 struct inet6_dev *idev;
828
4acd4945 829 for_each_netdev(net, dev) {
1da177e4
LT		 830 idev = __in6_dev_get(dev);
831 if (idev) {
e186932b
PE		 832 int changed = (!idev->cnf.forwarding) ^ (!newf);
833 idev->cnf.forwarding = newf;
1da177e4
LT		 834 if (changed)
835 dev_forward_change(idev);
836 }
1da177e4 837 }
1da177e4 838}
c8fecf22 839
013d97e9 840static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 841{
bff16c2f 842 struct net *net;
013d97e9
FR		 843 int old;
844
845 if (!rtnl_trylock())
846 return restart_syscall();
bff16c2f
PE		 847
848 net = (struct net *)table->extra2;
013d97e9
FR		 849 old = *p;
850 *p = newf;
b325fddb 851
013d97e9 852 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1 853 if ((!newf) ^ (!old))
85b3daad
DA		 854 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
855 NETCONFA_FORWARDING,
f3a1bfb1
ND		 856 NETCONFA_IFINDEX_DEFAULT,
857 net->ipv6.devconf_dflt);
013d97e9
FR		 858 rtnl_unlock();
859 return 0;
88af182e 860 }
c8fecf22 861
e186932b 862 if (p == &net->ipv6.devconf_all->forwarding) {
d26c638c
ND		 863 int old_dflt = net->ipv6.devconf_dflt->forwarding;
864
e186932b 865 net->ipv6.devconf_dflt->forwarding = newf;
d26c638c 866 if ((!newf) ^ (!old_dflt))
85b3daad
DA		 867 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
868 NETCONFA_FORWARDING,
d26c638c
ND		 869 NETCONFA_IFINDEX_DEFAULT,
870 net->ipv6.devconf_dflt);
871
e186932b 872 addrconf_forward_change(net, newf);
f3a1bfb1 873 if ((!newf) ^ (!old))
85b3daad
DA		 874 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
875 NETCONFA_FORWARDING,
f3a1bfb1
ND		 876 NETCONFA_IFINDEX_ALL,
877 net->ipv6.devconf_all);
013d97e9 878 } else if ((!newf) ^ (!old))
c8fecf22 879 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 880 rtnl_unlock();
c8fecf22 881
013d97e9 882 if (newf)
7b4da532 883 rt6_purge_dflt_routers(net);
b325fddb 884 return 1;
c8fecf22 885}
35103d11
AG		 886
887static void addrconf_linkdown_change(struct net *net, __s32 newf)
888{
889 struct net_device *dev;
890 struct inet6_dev *idev;
891
892 for_each_netdev(net, dev) {
893 idev = __in6_dev_get(dev);
894 if (idev) {
895 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
896
897 idev->cnf.ignore_routes_with_linkdown = newf;
898 if (changed)
899 inet6_netconf_notify_devconf(dev_net(dev),
85b3daad 900 RTM_NEWNETCONF,
35103d11
AG		 901 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
902 dev->ifindex,
903 &idev->cnf);
904 }
905 }
906}
907
908static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
909{
910 struct net *net;
911 int old;
912
913 if (!rtnl_trylock())
914 return restart_syscall();
915
916 net = (struct net *)table->extra2;
917 old = *p;
918 *p = newf;
919
920 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
921 if ((!newf) ^ (!old))
922 inet6_netconf_notify_devconf(net,
85b3daad 923 RTM_NEWNETCONF,
35103d11
AG		 924 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
925 NETCONFA_IFINDEX_DEFAULT,
926 net->ipv6.devconf_dflt);
927 rtnl_unlock();
928 return 0;
929 }
930
931 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
932 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
933 addrconf_linkdown_change(net, newf);
934 if ((!newf) ^ (!old))
935 inet6_netconf_notify_devconf(net,
85b3daad 936 RTM_NEWNETCONF,
35103d11
AG		 937 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
938 NETCONFA_IFINDEX_ALL,
939 net->ipv6.devconf_all);
940 }
941 rtnl_unlock();
942
943 return 1;
944}
945
1da177e4
LT		 946#endif
947
5c578aed 948/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 949void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
950{
c2e21293 951 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 952
1da177e4 953#ifdef NET_REFCNT_DEBUG
91df42be 954 pr_debug("%s\n", __func__);
1da177e4
LT		 955#endif
956
957 in6_dev_put(ifp->idev);
958
c15b1cca
HFS		 959 if (cancel_delayed_work(&ifp->dad_work))
960 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
961 ifp);
1da177e4 962
e9d3e084 963 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 964 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 965 return;
966 }
1da177e4 967
e5785985 968 kfree_rcu(ifp, rcu);
1da177e4
LT		 969}
970
e55ffac6
BH		 971static void
972ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
973{
502a2ffd 974 struct list_head *p;
8a6ce0c0 975 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 976
977 /*
978 * Each device address list is sorted in order of scope -
979 * global before linklocal.
980 */
502a2ffd 981 list_for_each(p, &idev->addr_list) {
982 struct inet6_ifaddr *ifa
983 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 984 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 985 break;
986 }
987
8ef802aa 988 list_add_tail_rcu(&ifp->if_list, p);
e55ffac6
BH		 989}
990
3f27fb23 991static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
3eb84f49 992{
3f27fb23
ED		 993 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
994
995 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 996}
997
56fc709b 998static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
752a9292 999 struct net_device *dev, unsigned int hash)
56fc709b 1000{
56fc709b
ED		 1001 struct inet6_ifaddr *ifp;
1002
1003 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1004 if (!net_eq(dev_net(ifp->idev->dev), net))
1005 continue;
1006 if (ipv6_addr_equal(&ifp->addr, addr)) {
1007 if (!dev || ifp->idev->dev == dev)
1008 return true;
1009 }
1010 }
1011 return false;
1012}
1013
f3d9832e
DA		 1014static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1015{
3f27fb23 1016 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
f3d9832e
DA		 1017 int err = 0;
1018
1019 spin_lock(&addrconf_hash_lock);
1020
1021 /* Ignore adding duplicate addresses on an interface */
752a9292 1022 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
e32ac250 1023 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
f3d9832e 1024 err = -EEXIST;
752a9292
ED		 1025 } else {
1026 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
f3d9832e
DA		 1027 }
1028
f3d9832e
DA		 1029 spin_unlock(&addrconf_hash_lock);
1030
1031 return err;
1032}
1033
1da177e4
LT		 1034/* On success it returns ifp with increased reference count */
1035
1036static struct inet6_ifaddr *
e6464b8c 1037ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
de95e047 1038 bool can_block, struct netlink_ext_ack *extack)
1da177e4 1039{
f3d9832e 1040 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
e6464b8c 1041 int addr_type = ipv6_addr_type(cfg->pfx);
df789fe7 1042 struct net *net = dev_net(idev->dev);
1da177e4 1043 struct inet6_ifaddr *ifa = NULL;
360a9887 1044 struct fib6_info *f6i = NULL;
1da177e4 1045 int err = 0;
d68b8270
YH		 1046
1047 if (addr_type == IPV6_ADDR_ANY ||
f17f7648
HL		 1048 (addr_type & IPV6_ADDR_MULTICAST &&
1049 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) ||
d68b8270 1050 (!(idev->dev->flags & IFF_LOOPBACK) &&
3ede0bbc 1051 !netif_is_l3_master(idev->dev) &&
d68b8270
YH		 1052 addr_type & IPV6_ADDR_LOOPBACK))
1053 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 1054
1da177e4
LT		 1055 if (idev->dead) {
1056 err = -ENODEV; /*XXX*/
f3d9832e 1057 goto out;
1da177e4
LT		 1058 }
1059
56d417b1 1060 if (idev->cnf.disable_ipv6) {
9bdd8d40 1061 err = -EACCES;
f3d9832e 1062 goto out;
9bdd8d40
BH		 1063 }
1064
ff7883ea
DA		 1065 /* validator notifier needs to be blocking;
1066 * do not call in atomic context
1067 */
1068 if (can_block) {
1069 struct in6_validator_info i6vi = {
e6464b8c 1070 .i6vi_addr = *cfg->pfx,
ff7883ea 1071 .i6vi_dev = idev,
de95e047 1072 .extack = extack,
ff7883ea
DA		 1073 };
1074
1075 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1076 err = notifier_to_errno(err);
1077 if (err < 0)
1078 goto out;
1079 }
1da177e4 1080
f3d9832e 1081 ifa = kzalloc(sizeof(*ifa), gfp_flags);
63159f29 1082 if (!ifa) {
1da177e4
LT		 1083 err = -ENOBUFS;
1084 goto out;
1085 }
1086
e6464b8c 1087 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
360a9887
DA		 1088 if (IS_ERR(f6i)) {
1089 err = PTR_ERR(f6i);
1090 f6i = NULL;
1da177e4
LT		 1091 goto out;
1092 }
1093
df789fe7
DF		 1094 if (net->ipv6.devconf_all->disable_policy ||
1095 idev->cnf.disable_policy)
360a9887 1096 f6i->dst_nopolicy = true;
df789fe7 1097
bba24896
JP		 1098 neigh_parms_data_state_setall(idev->nd_parms);
1099
e6464b8c
DA		 1100 ifa->addr = *cfg->pfx;
1101 if (cfg->peer_pfx)
1102 ifa->peer_addr = *cfg->peer_pfx;
1da177e4
LT		 1103
1104 spin_lock_init(&ifa->lock);
c15b1cca 1105 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 1106 INIT_HLIST_NODE(&ifa->addr_lst);
e6464b8c
DA		 1107 ifa->scope = cfg->scope;
1108 ifa->prefix_len = cfg->plen;
8308f3ff 1109 ifa->rt_priority = cfg->rt_priority;
e6464b8c 1110 ifa->flags = cfg->ifa_flags;
66eb9f86 1111 /* No need to add the TENTATIVE flag for addresses with NODAD */
e6464b8c 1112 if (!(cfg->ifa_flags & IFA_F_NODAD))
66eb9f86 1113 ifa->flags |= IFA_F_TENTATIVE;
e6464b8c
DA		 1114 ifa->valid_lft = cfg->valid_lft;
1115 ifa->prefered_lft = cfg->preferred_lft;
1da177e4 1116 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 1117 ifa->tokenized = false;
1da177e4 1118
360a9887 1119 ifa->rt = f6i;
57f5f544 1120
1da177e4 1121 ifa->idev = idev;
f3d9832e
DA		 1122 in6_dev_hold(idev);
1123
1da177e4 1124 /* For caller */
271201c0 1125 refcount_set(&ifa->refcnt, 1);
1da177e4 1126
f3d9832e 1127 rcu_read_lock_bh();
1da177e4 1128
f3d9832e
DA		 1129 err = ipv6_add_addr_hash(idev->dev, ifa);
1130 if (err < 0) {
1131 rcu_read_unlock_bh();
1132 goto out;
1133 }
1da177e4
LT		 1134
1135 write_lock(&idev->lock);
f3d9832e 1136
1da177e4 1137 /* Add to inet6_dev unicast addr list. */
e55ffac6 1138 ipv6_link_dev_addr(idev, ifa);
1da177e4 1139
1da177e4 1140 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 1141 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 1142 in6_ifa_hold(ifa);
1143 }
1da177e4 1144
1da177e4
LT		 1145 in6_ifa_hold(ifa);
1146 write_unlock(&idev->lock);
f3d9832e 1147
8814c4b5 1148 rcu_read_unlock_bh();
1da177e4 1149
f3d9832e
DA		 1150 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1151out:
1152 if (unlikely(err < 0)) {
360a9887 1153 fib6_info_release(f6i);
93531c67 1154
f3d9832e
DA		 1155 if (ifa) {
1156 if (ifa->idev)
1157 in6_dev_put(ifa->idev);
1158 kfree(ifa);
1159 }
1da177e4
LT		 1160 ifa = ERR_PTR(err);
1161 }
1162
1163 return ifa;
1da177e4
LT		 1164}
1165
5b84efec
TH		 1166enum cleanup_prefix_rt_t {
1167 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1168 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1169 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1170};
1171
1172/*
1173 * Check, whether the prefix for ifp would still need a prefix route
1174 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1175 * constants.
1176 *
1177 * 1) we don't purge prefix if address was not permanent.
1178 * prefix is managed by its own lifetime.
1179 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1180 * 3) if there are no addresses, delete prefix.
1181 * 4) if there are still other permanent address(es),
1182 * corresponding prefix is still permanent.
1183 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1184 * don't purge the prefix, assume user space is managing it.
1185 * 6) otherwise, update prefix lifetime to the
1186 * longest valid lifetime among the corresponding
1187 * addresses on the device.
1188 * Note: subsequent RA will update lifetime.
1189 **/
1190static enum cleanup_prefix_rt_t
1191check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1192{
1193 struct inet6_ifaddr *ifa;
1194 struct inet6_dev *idev = ifp->idev;
1195 unsigned long lifetime;
1196 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1197
1198 *expires = jiffies;
1199
1200 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1201 if (ifa == ifp)
1202 continue;
e75913c9
ZL		 1203 if (ifa->prefix_len != ifp->prefix_len ||
1204 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
5b84efec
TH		 1205 ifp->prefix_len))
1206 continue;
1207 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1208 return CLEANUP_PREFIX_RT_NOP;
1209
1210 action = CLEANUP_PREFIX_RT_EXPIRE;
1211
1212 spin_lock(&ifa->lock);
1213
1214 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1215 /*
1216 * Note: Because this address is
1217 * not permanent, lifetime <
1218 * LONG_MAX / HZ here.
1219 */
1220 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1221 *expires = ifa->tstamp + lifetime * HZ;
1222 spin_unlock(&ifa->lock);
1223 }
1224
1225 return action;
1226}
1227
1228static void
1229cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1230{
93c2fb25 1231 struct fib6_info *f6i;
5b84efec 1232
2b2450ca
DA		 1233 f6i = addrconf_get_prefix_route(&ifp->addr, ifp->prefix_len,
1234 ifp->idev->dev, 0, RTF_DEFAULT, true);
93c2fb25 1235 if (f6i) {
5b84efec 1236 if (del_rt)
93c2fb25 1237 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
5b84efec 1238 else {
93c2fb25
DA		 1239 if (!(f6i->fib6_flags & RTF_EXPIRES))
1240 fib6_set_expires(f6i, expires);
1241 fib6_info_release(f6i);
5b84efec
TH		 1242 }
1243 }
1244}
1245
1246
1da177e4
LT		 1247/* This function wants to get referenced ifp and releases it before return */
1248
1249static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1250{
4c5ff6a6 1251 int state;
5b84efec
TH		 1252 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1253 unsigned long expires;
1da177e4 1254
c15b1cca
HFS		 1255 ASSERT_RTNL();
1256
8e8e676d 1257 spin_lock_bh(&ifp->lock);
4c5ff6a6 1258 state = ifp->state;
e9d3e084 1259 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1260 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1261
1262 if (state == INET6_IFADDR_STATE_DEAD)
1263 goto out;
1da177e4 1264
5c578aed 1265 spin_lock_bh(&addrconf_hash_lock);
1266 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1267 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1268
5b84efec 1269 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1270
1da177e4 1271 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1272 list_del(&ifp->tmp_list);
1273 if (ifp->ifpub) {
1274 in6_ifa_put(ifp->ifpub);
1275 ifp->ifpub = NULL;
1da177e4 1276 }
372e6c8f 1277 __in6_ifa_put(ifp);
1da177e4 1278 }
1da177e4 1279
5b84efec
TH		 1280 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1281 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1282
8ef802aa 1283 list_del_rcu(&ifp->if_list);
5b84efec
TH		 1284 __in6_ifa_put(ifp);
1285
1286 write_unlock_bh(&ifp->idev->lock);
1da177e4 1287
c15b1cca 1288 addrconf_del_dad_work(ifp);
b2238566 1289
1da177e4
LT		 1290 ipv6_ifa_notify(RTM_DELADDR, ifp);
1291
f88c91dd 1292 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1293
5b84efec
TH		 1294 if (action != CLEANUP_PREFIX_RT_NOP) {
1295 cleanup_prefix_route(ifp, expires,
1296 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1297 }
1298
c3968a85
DW		 1299 /* clean up prefsrc entries */
1300 rt6_remove_prefsrc(ifp);
4c5ff6a6 1301out:
1da177e4
LT		 1302 in6_ifa_put(ifp);
1303}
1304
fffcefe9
ED		 1305static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp,
1306 struct inet6_ifaddr *ift,
1307 bool block)
1da177e4
LT		 1308{
1309 struct inet6_dev *idev = ifp->idev;
1310 struct in6_addr addr, *tmpaddr;
e6464b8c 1311 unsigned long tmp_tstamp, age;
eac55bf9 1312 unsigned long regen_advance;
e6464b8c 1313 struct ifa6_config cfg;
1da177e4 1314 int ret = 0;
76f793e3 1315 unsigned long now = jiffies;
76506a98 1316 long max_desync_factor;
7aa8e63f 1317 s32 cnf_temp_preferred_lft;
1da177e4 1318
53bd6749 1319 write_lock_bh(&idev->lock);
1da177e4
LT		 1320 if (ift) {
1321 spin_lock_bh(&ift->lock);
1322 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1323 spin_unlock_bh(&ift->lock);
1324 tmpaddr = &addr;
1325 } else {
1326 tmpaddr = NULL;
1327 }
1328retry:
1329 in6_dev_hold(idev);
1330 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1331 write_unlock_bh(&idev->lock);
f3213831 1332 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1333 in6_dev_put(idev);
1334 ret = -1;
1335 goto out;
1336 }
1337 spin_lock_bh(&ifp->lock);
1338 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1339 idev->cnf.use_tempaddr = -1; /*XXX*/
1340 spin_unlock_bh(&ifp->lock);
53bd6749 1341 write_unlock_bh(&idev->lock);
f3213831
JP		 1342 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1343 __func__);
1da177e4
LT		 1344 in6_dev_put(idev);
1345 ret = -1;
1346 goto out;
1347 }
1348 in6_ifa_hold(ifp);
1349 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
9d6280da 1350 ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1351 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1352 age = (now - ifp->tstamp) / HZ;
76506a98
JB		 1353
1354 regen_advance = idev->cnf.regen_max_retry *
1355 idev->cnf.dad_transmits *
1356 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1357
1358 /* recalculate max_desync_factor each time and update
1359 * idev->desync_factor if it's larger
1360 */
7aa8e63f 1361 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
76506a98
JB		 1362 max_desync_factor = min_t(__u32,
1363 idev->cnf.max_desync_factor,
7aa8e63f 1364 cnf_temp_preferred_lft - regen_advance);
76506a98
JB		 1365
1366 if (unlikely(idev->desync_factor > max_desync_factor)) {
1367 if (max_desync_factor > 0) {
1368 get_random_bytes(&idev->desync_factor,
1369 sizeof(idev->desync_factor));
1370 idev->desync_factor %= max_desync_factor;
1371 } else {
1372 idev->desync_factor = 0;
1373 }
1374 }
1375
3f2d67b6 1376 memset(&cfg, 0, sizeof(cfg));
e6464b8c 1377 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
7a876b0e 1378 idev->cnf.temp_valid_lft + age);
e6464b8c
DA		 1379 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1380 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1381
1382 cfg.plen = ifp->prefix_len;
1da177e4
LT		 1383 tmp_tstamp = ifp->tstamp;
1384 spin_unlock_bh(&ifp->lock);
1385
53bd6749 1386 write_unlock_bh(&idev->lock);
95c385b4 1387
eac55bf9
BB		 1388 /* A temporary address is created only if this calculated Preferred
1389 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1390 * an implementation must not create a temporary address with a zero
1391 * Preferred Lifetime.
ecab6701
HK		 1392 * Use age calculation as in addrconf_verify to avoid unnecessary
1393 * temporary addresses being generated.
eac55bf9 1394 */
ecab6701 1395 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
e6464b8c 1396 if (cfg.preferred_lft <= regen_advance + age) {
eac55bf9
BB		 1397 in6_ifa_put(ifp);
1398 in6_dev_put(idev);
1399 ret = -1;
1400 goto out;
1401 }
1402
e6464b8c 1403 cfg.ifa_flags = IFA_F_TEMPORARY;
95c385b4
NH		 1404 /* set in addrconf_prefix_rcv() */
1405 if (ifp->flags & IFA_F_OPTIMISTIC)
e6464b8c 1406 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
95c385b4 1407
e6464b8c
DA		 1408 cfg.pfx = &addr;
1409 cfg.scope = ipv6_addr_scope(cfg.pfx);
95c385b4 1410
e6464b8c 1411 ift = ipv6_add_addr(idev, &cfg, block, NULL);
4b08a8f1 1412 if (IS_ERR(ift)) {
1da177e4
LT		 1413 in6_ifa_put(ifp);
1414 in6_dev_put(idev);
f3213831 1415 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1416 tmpaddr = &addr;
53bd6749 1417 write_lock_bh(&idev->lock);
1da177e4
LT		 1418 goto retry;
1419 }
1420
1421 spin_lock_bh(&ift->lock);
1422 ift->ifpub = ifp;
76f793e3 1423 ift->cstamp = now;
1da177e4
LT		 1424 ift->tstamp = tmp_tstamp;
1425 spin_unlock_bh(&ift->lock);
1426
cf22f9a2 1427 addrconf_dad_start(ift);
1da177e4
LT		 1428 in6_ifa_put(ift);
1429 in6_dev_put(idev);
1430out:
1431 return ret;
1432}
1da177e4
LT		 1433
1434/*
072047e4 1435 * Choose an appropriate source address (RFC3484)
1da177e4 1436 */
a9b05723
YH		 1437enum {
1438 IPV6_SADDR_RULE_INIT = 0,
1439 IPV6_SADDR_RULE_LOCAL,
1440 IPV6_SADDR_RULE_SCOPE,
1441 IPV6_SADDR_RULE_PREFERRED,
1442#ifdef CONFIG_IPV6_MIP6
1443 IPV6_SADDR_RULE_HOA,
1444#endif
1445 IPV6_SADDR_RULE_OIF,
1446 IPV6_SADDR_RULE_LABEL,
a9b05723 1447 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1448 IPV6_SADDR_RULE_ORCHID,
1449 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1450#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1451 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1452#endif
a9b05723
YH		 1453 IPV6_SADDR_RULE_MAX
1454};
1455
072047e4 1456struct ipv6_saddr_score {
a9b05723
YH		 1457 int rule;
1458 int addr_type;
1459 struct inet6_ifaddr *ifa;
1460 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1461 int scopedist;
1462 int matchlen;
072047e4
YH		 1463};
1464
a9b05723 1465struct ipv6_saddr_dst {
9acd9f3a 1466 const struct in6_addr *addr;
a9b05723
YH		 1467 int ifindex;
1468 int scope;
1469 int label;
7cbca67c 1470 unsigned int prefs;
a9b05723 1471};
072047e4 1472
b6f99a21 1473static inline int ipv6_saddr_preferred(int type)
1da177e4 1474{
45bb0060 1475 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1476 return 1;
1477 return 0;
1da177e4
LT		 1478}
1479
35e015e1
MC		 1480static bool ipv6_use_optimistic_addr(struct net *net,
1481 struct inet6_dev *idev)
7fd2561e
EK		 1482{
1483#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 1484 if (!idev)
1485 return false;
1486 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1487 return false;
1488 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1489 return false;
1490
1491 return true;
7fd2561e
EK		 1492#else
1493 return false;
1494#endif
1495}
1496
f1c02cfb
SD		 1497static bool ipv6_allow_optimistic_dad(struct net *net,
1498 struct inet6_dev *idev)
1499{
1500#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1501 if (!idev)
1502 return false;
1503 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1504 return false;
1505
1506 return true;
1507#else
1508 return false;
1509#endif
1510}
1511
3de23255
BT		 1512static int ipv6_get_saddr_eval(struct net *net,
1513 struct ipv6_saddr_score *score,
a9b05723
YH		 1514 struct ipv6_saddr_dst *dst,
1515 int i)
1516{
1517 int ret;
1518
1519 if (i <= score->rule) {
1520 switch (i) {
1521 case IPV6_SADDR_RULE_SCOPE:
1522 ret = score->scopedist;
1523 break;
1524 case IPV6_SADDR_RULE_PREFIX:
1525 ret = score->matchlen;
1526 break;
1527 default:
1528 ret = !!test_bit(i, score->scorebits);
1529 }
1530 goto out;
1531 }
1532
1533 switch (i) {
1534 case IPV6_SADDR_RULE_INIT:
1535 /* Rule 0: remember if hiscore is not ready yet */
1536 ret = !!score->ifa;
1537 break;
1538 case IPV6_SADDR_RULE_LOCAL:
1539 /* Rule 1: Prefer same address */
1540 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1541 break;
1542 case IPV6_SADDR_RULE_SCOPE:
1543 /* Rule 2: Prefer appropriate scope
1544 *
1545 * ret
1546 * ^
1547 * -1 | d 15
1548 * ---+--+-+---> scope
1549 * |
1550 * | d is scope of the destination.
1551 * B-d | \
1552 * | \ <- smaller scope is better if
db9c7c39 1553 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1554 * | ret = B - scope (-1 <= scope >= d <= 15).
1555 * d-C-1 | /
1556 * |/ <- greater is better
1557 * -C / if scope is not enough for destination.
1558 * /| ret = scope - C (-1 <= d < scope <= 15).
1559 *
1560 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1561 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1562 * Assume B = 0 and we get C > 29.
1563 */
1564 ret = __ipv6_addr_src_scope(score->addr_type);
1565 if (ret >= dst->scope)
1566 ret = -ret;
1567 else
1568 ret -= 128; /* 30 is enough */
1569 score->scopedist = ret;
1570 break;
1571 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1572 {
a9b05723 1573 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1574 u8 avoid = IFA_F_DEPRECATED;
1575
35e015e1 1576 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
7fd2561e 1577 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1578 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1579 !(score->ifa->flags & avoid);
a9b05723 1580 break;
7fd2561e 1581 }
a9b05723
YH		 1582#ifdef CONFIG_IPV6_MIP6
1583 case IPV6_SADDR_RULE_HOA:
7cbca67c 1584 {
a9b05723 1585 /* Rule 4: Prefer home address */
7cbca67c
YH		 1586 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1587 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1588 break;
7cbca67c 1589 }
a9b05723
YH		 1590#endif
1591 case IPV6_SADDR_RULE_OIF:
1592 /* Rule 5: Prefer outgoing interface */
1593 ret = (!dst->ifindex ||
1594 dst->ifindex == score->ifa->idev->dev->ifindex);
1595 break;
1596 case IPV6_SADDR_RULE_LABEL:
1597 /* Rule 6: Prefer matching label */
3de23255
BT		 1598 ret = ipv6_addr_label(net,
1599 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1600 score->ifa->idev->dev->ifindex) == dst->label;
1601 break;
a9b05723 1602 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1603 {
a9b05723 1604 /* Rule 7: Prefer public address
25985edc 1605 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1606 */
7cbca67c
YH		 1607 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1608 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1609 score->ifa->idev->cnf.use_tempaddr >= 2;
1610 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1611 break;
7cbca67c 1612 }
a9b05723
YH		 1613 case IPV6_SADDR_RULE_ORCHID:
1614 /* Rule 8-: Prefer ORCHID vs ORCHID or
1615 * non-ORCHID vs non-ORCHID
1616 */
1617 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1618 ipv6_addr_orchid(dst->addr));
1619 break;
1620 case IPV6_SADDR_RULE_PREFIX:
1621 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1622 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1623 if (ret > score->ifa->prefix_len)
1624 ret = score->ifa->prefix_len;
1625 score->matchlen = ret;
a9b05723 1626 break;
7fd2561e
EK		 1627#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1628 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1629 /* Optimistic addresses still have lower precedence than other
1630 * preferred addresses.
1631 */
1632 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1633 break;
1634#endif
a9b05723
YH		 1635 default:
1636 ret = 0;
1637 }
1638
1639 if (ret)
1640 __set_bit(i, score->scorebits);
1641 score->rule = i;
1642out:
1643 return ret;
1644}
1645
c0b8da1e
YH		 1646static int __ipv6_dev_get_saddr(struct net *net,
1647 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1648 struct inet6_dev *idev,
1649 struct ipv6_saddr_score *scores,
1650 int hiscore_idx)
9131f3de 1651{
c0b8da1e 1652 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de 1653
f59c031e 1654 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
9131f3de
YH		 1655 int i;
1656
1657 /*
1658 * - Tentative Address (RFC2462 section 5.4)
1659 * - A tentative address is not considered
1660 * "assigned to an interface" in the traditional
1661 * sense, unless it is also flagged as optimistic.
1662 * - Candidate Source Address (section 4)
1663 * - In any case, anycast addresses, multicast
1664 * addresses, and the unspecified address MUST
1665 * NOT be included in a candidate set.
1666 */
1667 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1668 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1669 continue;
1670
1671 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1672
1673 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1674 score->addr_type & IPV6_ADDR_MULTICAST)) {
1675 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1676 idev->dev->name);
1677 continue;
1678 }
1679
1680 score->rule = -1;
1681 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1682
1683 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1684 int minihiscore, miniscore;
1685
1686 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1687 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1688
1689 if (minihiscore > miniscore) {
1690 if (i == IPV6_SADDR_RULE_SCOPE &&
1691 score->scopedist > 0) {
1692 /*
1693 * special case:
1694 * each remaining entry
1695 * has too small (not enough)
1696 * scope, because ifa entries
1697 * are sorted by their scope
1698 * values.
1699 */
1700 goto out;
1701 }
1702 break;
1703 } else if (minihiscore < miniscore) {
9131f3de 1704 swap(hiscore, score);
c0b8da1e 1705 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1706
1707 /* restore our iterator */
1708 score->ifa = hiscore->ifa;
1709
1710 break;
1711 }
1712 }
1713 }
1714out:
c0b8da1e 1715 return hiscore_idx;
9131f3de
YH		 1716}
1717
afbac601
DA		 1718static int ipv6_get_saddr_master(struct net *net,
1719 const struct net_device *dst_dev,
1720 const struct net_device *master,
1721 struct ipv6_saddr_dst *dst,
1722 struct ipv6_saddr_score *scores,
1723 int hiscore_idx)
1724{
1725 struct inet6_dev *idev;
1726
1727 idev = __in6_dev_get(dst_dev);
1728 if (idev)
1729 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1730 scores, hiscore_idx);
1731
1732 idev = __in6_dev_get(master);
1733 if (idev)
1734 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1735 scores, hiscore_idx);
1736
1737 return hiscore_idx;
1738}
1739
b3f644fc 1740int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1741 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1742 struct in6_addr *saddr)
1da177e4 1743{
c0b8da1e 1744 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1745 struct ipv6_saddr_dst dst;
9131f3de 1746 struct inet6_dev *idev;
072047e4 1747 struct net_device *dev;
a9b05723 1748 int dst_type;
9131f3de 1749 bool use_oif_addr = false;
c0b8da1e 1750 int hiscore_idx = 0;
cc429c8f 1751 int ret = 0;
1da177e4 1752
a9b05723
YH		 1753 dst_type = __ipv6_addr_type(daddr);
1754 dst.addr = daddr;
1755 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1756 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1757 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1758 dst.prefs = prefs;
a9b05723 1759
c0b8da1e
YH		 1760 scores[hiscore_idx].rule = -1;
1761 scores[hiscore_idx].ifa = NULL;
1da177e4 1762
8814c4b5 1763 rcu_read_lock();
1da177e4 1764
9131f3de
YH		 1765 /* Candidate Source Address (section 4)
1766 * - multicast and link-local destination address,
1767 * the set of candidate source address MUST only
1768 * include addresses assigned to interfaces
1769 * belonging to the same link as the outgoing
1770 * interface.
1771 * (- For site-local destination addresses, the
1772 * set of candidate source addresses MUST only
1773 * include addresses assigned to interfaces
1774 * belonging to the same site as the outgoing
1775 * interface.)
3985e8a3
EK		 1776 * - "It is RECOMMENDED that the candidate source addresses
1777 * be the set of unicast addresses assigned to the
1778 * interface that will be used to send to the destination
1779 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1780 */
1781 if (dst_dev) {
3985e8a3 1782 idev = __in6_dev_get(dst_dev);
9131f3de 1783 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1784 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1785 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1786 use_oif_addr = true;
1787 }
1788 }
a9b05723 1789
9131f3de 1790 if (use_oif_addr) {
c0b8da1e 1791 if (idev)
c15df306 1792 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de 1793 } else {
afbac601
DA		 1794 const struct net_device *master;
1795 int master_idx = 0;
1796
1797 /* if dst_dev exists and is enslaved to an L3 device, then
1798 * prefer addresses from dst_dev and then the master over
1799 * any other enslaved devices in the L3 domain.
1800 */
1801 master = l3mdev_master_dev_rcu(dst_dev);
1802 if (master) {
1803 master_idx = master->ifindex;
1804
1805 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1806 master, &dst,
1807 scores, hiscore_idx);
1808
1809 if (scores[hiscore_idx].ifa)
1810 goto out;
1811 }
1812
9131f3de 1813 for_each_netdev_rcu(net, dev) {
afbac601
DA		 1814 /* only consider addresses on devices in the
1815 * same L3 domain
1816 */
1817 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1818 continue;
9131f3de
YH		 1819 idev = __in6_dev_get(dev);
1820 if (!idev)
072047e4 1821 continue;
c15df306 1822 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1823 }
1824 }
afbac601
DA		 1825
1826out:
c0b8da1e 1827 hiscore = &scores[hiscore_idx];
a9b05723 1828 if (!hiscore->ifa)
cc429c8f
ED		 1829 ret = -EADDRNOTAVAIL;
1830 else
1831 *saddr = hiscore->ifa->addr;
1ab1457c 1832
cc429c8f
ED		 1833 rcu_read_unlock();
1834 return ret;
1da177e4 1835}
5e5f3f0f 1836EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1837
8965779d 1838int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1839 u32 banned_flags)
b7b1bfce
HFS		 1840{
1841 struct inet6_ifaddr *ifp;
1842 int err = -EADDRNOTAVAIL;
1843
602582ca
HFS		 1844 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1845 if (ifp->scope > IFA_LINK)
1846 break;
b7b1bfce
HFS		 1847 if (ifp->scope == IFA_LINK &&
1848 !(ifp->flags & banned_flags)) {
1849 *addr = ifp->addr;
1850 err = 0;
1851 break;
1852 }
1853 }
1854 return err;
1855}
1856
95c385b4 1857int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1858 u32 banned_flags)
1da177e4
LT		 1859{
1860 struct inet6_dev *idev;
1861 int err = -EADDRNOTAVAIL;
1862
8814c4b5 1863 rcu_read_lock();
e21e8467
SH		 1864 idev = __in6_dev_get(dev);
1865 if (idev) {
1da177e4 1866 read_lock_bh(&idev->lock);
b7b1bfce 1867 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1868 read_unlock_bh(&idev->lock);
1869 }
8814c4b5 1870 rcu_read_unlock();
1da177e4
LT		 1871 return err;
1872}
1873
d9bf82c2 1874static int ipv6_count_addresses(const struct inet6_dev *idev)
1da177e4 1875{
d9bf82c2 1876 const struct inet6_ifaddr *ifp;
1da177e4 1877 int cnt = 0;
1da177e4 1878
d9bf82c2
ED		 1879 rcu_read_lock();
1880 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1da177e4 1881 cnt++;
d9bf82c2 1882 rcu_read_unlock();
1da177e4
LT		 1883 return cnt;
1884}
1885
b71d1d42 1886int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1887 const struct net_device *dev, int strict)
c58da4c6 1888{
232378e8
DA		 1889 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1890 strict, IFA_F_TENTATIVE);
c58da4c6
EK		 1891}
1892EXPORT_SYMBOL(ipv6_chk_addr);
1893
1893ff20
DA		 1894/* device argument is used to find the L3 domain of interest. If
1895 * skip_dev_check is set, then the ifp device is not checked against
1896 * the passed in dev argument. So the 2 cases for addresses checks are:
1897 * 1. does the address exist in the L3 domain that dev is part of
1898 * (skip_dev_check = true), or
1899 *
1900 * 2. does the address exist on the specific device
1901 * (skip_dev_check = false)
1902 */
c58da4c6 1903int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
232378e8
DA		 1904 const struct net_device *dev, bool skip_dev_check,
1905 int strict, u32 banned_flags)
1da177e4 1906{
3f27fb23 1907 unsigned int hash = inet6_addr_hash(net, addr);
1893ff20 1908 const struct net_device *l3mdev;
eedf042a 1909 struct inet6_ifaddr *ifp;
c58da4c6 1910 u32 ifp_flags;
1da177e4 1911
480318a0 1912 rcu_read_lock();
232378e8 1913
1893ff20 1914 l3mdev = l3mdev_master_dev_rcu(dev);
232378e8
DA		 1915 if (skip_dev_check)
1916 dev = NULL;
1917
b67bfe0d 1918 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1919 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1920 continue;
1893ff20
DA		 1921
1922 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev)
1923 continue;
1924
c58da4c6
EK		 1925 /* Decouple optimistic from tentative for evaluation here.
1926 * Ban optimistic addresses explicitly, when required.
1927 */
1928 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1929 ? (ifp->flags&~IFA_F_TENTATIVE)
1930 : ifp->flags;
1da177e4 1931 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1932 !(ifp_flags&banned_flags) &&
63159f29 1933 (!dev || ifp->idev->dev == dev ||
eedf042a 1934 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
480318a0 1935 rcu_read_unlock();
eedf042a 1936 return 1;
1da177e4
LT		 1937 }
1938 }
5c578aed 1939
480318a0 1940 rcu_read_unlock();
eedf042a 1941 return 0;
1da177e4 1942}
c58da4c6 1943EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1944
1da177e4 1945
7df37ff3
CB		 1946/* Compares an address/prefix_len with addresses on device @dev.
1947 * If one is found it returns true.
1948 */
1949bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1950 const unsigned int prefix_len, struct net_device *dev)
1951{
47e26941
ED		 1952 const struct inet6_ifaddr *ifa;
1953 const struct inet6_dev *idev;
7df37ff3
CB		 1954 bool ret = false;
1955
1956 rcu_read_lock();
1957 idev = __in6_dev_get(dev);
1958 if (idev) {
47e26941 1959 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
7df37ff3
CB		 1960 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1961 if (ret)
1962 break;
1963 }
7df37ff3
CB		 1964 }
1965 rcu_read_unlock();
1966
1967 return ret;
1968}
1969EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1970
b71d1d42 1971int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84 1972{
24ba333b
ED		 1973 const struct inet6_ifaddr *ifa;
1974 const struct inet6_dev *idev;
52eeeb84
YH		 1975 int onlink;
1976
1977 onlink = 0;
1978 rcu_read_lock();
1979 idev = __in6_dev_get(dev);
1980 if (idev) {
24ba333b 1981 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1982 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1983 ifa->prefix_len);
1984 if (onlink)
1985 break;
1986 }
52eeeb84
YH		 1987 }
1988 rcu_read_unlock();
1989 return onlink;
1990}
52eeeb84
YH		 1991EXPORT_SYMBOL(ipv6_chk_prefix);
1992
9acd9f3a 1993struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1994 struct net_device *dev, int strict)
1da177e4 1995{
3f27fb23 1996 unsigned int hash = inet6_addr_hash(net, addr);
b79d1d54 1997 struct inet6_ifaddr *ifp, *result = NULL;
1da177e4 1998
24f226da
ED		 1999 rcu_read_lock();
2000 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 2001 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 2002 continue;
1da177e4 2003 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 2004 if (!dev || ifp->idev->dev == dev ||
1da177e4 2005 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 2006 result = ifp;
1da177e4
LT		 2007 in6_ifa_hold(ifp);
2008 break;
2009 }
2010 }
2011 }
24f226da 2012 rcu_read_unlock();
1da177e4 2013
b79d1d54 2014 return result;
1da177e4
LT		 2015}
2016
1da177e4
LT		 2017/* Gets referenced address, destroys ifaddr */
2018
cc411d0b 2019static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 2020{
3d171f39
LR		 2021 if (dad_failed)
2022 ifp->flags |= IFA_F_DADFAILED;
2023
ec8add2a 2024 if (ifp->flags&IFA_F_TEMPORARY) {
1da177e4
LT		 2025 struct inet6_ifaddr *ifpub;
2026 spin_lock_bh(&ifp->lock);
2027 ifpub = ifp->ifpub;
2028 if (ifpub) {
2029 in6_ifa_hold(ifpub);
2030 spin_unlock_bh(&ifp->lock);
fffcefe9 2031 ipv6_create_tempaddr(ifpub, ifp, true);
1da177e4
LT		 2032 in6_ifa_put(ifpub);
2033 } else {
2034 spin_unlock_bh(&ifp->lock);
2035 }
2036 ipv6_del_addr(ifp);
ec8add2a
SD		 2037 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2038 spin_lock_bh(&ifp->lock);
2039 addrconf_del_dad_work(ifp);
2040 ifp->flags |= IFA_F_TENTATIVE;
f1c02cfb
SD		 2041 if (dad_failed)
2042 ifp->flags &= ~IFA_F_OPTIMISTIC;
ec8add2a
SD		 2043 spin_unlock_bh(&ifp->lock);
2044 if (dad_failed)
2045 ipv6_ifa_notify(0, ifp);
2046 in6_ifa_put(ifp);
c15b1cca 2047 } else {
1da177e4 2048 ipv6_del_addr(ifp);
c15b1cca 2049 }
1da177e4
LT		 2050}
2051
f2344a13
HX		 2052static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2053{
2054 int err = -ENOENT;
2055
8e8e676d 2056 spin_lock_bh(&ifp->lock);
f2344a13
HX		 2057 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2058 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2059 err = 0;
2060 }
8e8e676d 2061 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 2062
2063 return err;
2064}
2065
da13c59b 2066void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
3c21edbd 2067{
1b34be74 2068 struct inet6_dev *idev = ifp->idev;
1855b7c3 2069 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 2070
853dc2e0
UB		 2071 if (addrconf_dad_end(ifp)) {
2072 in6_ifa_put(ifp);
f2344a13 2073 return;
853dc2e0 2074 }
f2344a13 2075
da13c59b
VP		 2076 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2077 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
9bdd8d40 2078
5f40ef77
HFS		 2079 spin_lock_bh(&ifp->lock);
2080
2081 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
5f40ef77
HFS		 2082 struct in6_addr new_addr;
2083 struct inet6_ifaddr *ifp2;
5f40ef77 2084 int retries = ifp->stable_privacy_retry + 1;
e6464b8c
DA		 2085 struct ifa6_config cfg = {
2086 .pfx = &new_addr,
2087 .plen = ifp->prefix_len,
2088 .ifa_flags = ifp->flags,
2089 .valid_lft = ifp->valid_lft,
2090 .preferred_lft = ifp->prefered_lft,
2091 .scope = ifp->scope,
2092 };
5f40ef77 2093
1855b7c3 2094 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 2095 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2096 ifp->idev->dev->name);
2097 goto errdad;
2098 }
2099
2100 new_addr = ifp->addr;
2101 if (ipv6_generate_stable_address(&new_addr, retries,
2102 idev))
2103 goto errdad;
2104
5f40ef77 2105 spin_unlock_bh(&ifp->lock);
1b34be74 2106
5f40ef77
HFS		 2107 if (idev->cnf.max_addresses &&
2108 ipv6_count_addresses(idev) >=
2109 idev->cnf.max_addresses)
2110 goto lock_errdad;
2111
2112 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2113 ifp->idev->dev->name);
2114
e6464b8c 2115 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
5f40ef77
HFS		 2116 if (IS_ERR(ifp2))
2117 goto lock_errdad;
2118
2119 spin_lock_bh(&ifp2->lock);
2120 ifp2->stable_privacy_retry = retries;
2121 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2122 spin_unlock_bh(&ifp2->lock);
2123
1855b7c3 2124 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 2125 in6_ifa_put(ifp2);
2126lock_errdad:
2127 spin_lock_bh(&ifp->lock);
1b34be74
YH		 2128 }
2129
5f40ef77 2130errdad:
c15b1cca
HFS		 2131 /* transition from _POSTDAD to _ERRDAD */
2132 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 2133 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 2134
2135 addrconf_mod_dad_work(ifp, 0);
751eb6b6 2136 in6_ifa_put(ifp);
3c21edbd 2137}
1da177e4 2138
a9ed4a29
SD		 2139/* Join to solicited addr multicast group.
2140 * caller must hold RTNL */
b71d1d42 2141void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 2142{
2143 struct in6_addr maddr;
2144
2145 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2146 return;
2147
2148 addrconf_addr_solict_mult(addr, &maddr);
2149 ipv6_dev_mc_inc(dev, &maddr);
2150}
2151
a9ed4a29 2152/* caller must hold RTNL */
b71d1d42 2153void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 2154{
2155 struct in6_addr maddr;
2156
2157 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2158 return;
2159
2160 addrconf_addr_solict_mult(addr, &maddr);
2161 __ipv6_dev_mc_dec(idev, &maddr);
2162}
2163
a9ed4a29 2164/* caller must hold RTNL */
20380731 2165static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2166{
2167 struct in6_addr addr;
c15b1cca 2168
88ad3149 2169 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 2170 return;
1da177e4
LT		 2171 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2172 if (ipv6_addr_any(&addr))
2173 return;
013b4d90 2174 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 2175}
2176
a9ed4a29 2177/* caller must hold RTNL */
20380731 2178static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2179{
2180 struct in6_addr addr;
c15b1cca 2181
88ad3149 2182 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 2183 return;
1da177e4
LT		 2184 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2185 if (ipv6_addr_any(&addr))
2186 return;
2187 __ipv6_dev_ac_dec(ifp->idev, &addr);
2188}
2189
8a7a4b47 2190static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
06a4c1c5 2191{
8a7a4b47
AA		 2192 switch (dev->addr_len) {
2193 case ETH_ALEN:
9dae2e03
LAD		 2194 memcpy(eui, dev->dev_addr, 3);
2195 eui[3] = 0xFF;
2196 eui[4] = 0xFE;
2197 memcpy(eui + 5, dev->dev_addr + 3, 3);
2198 break;
8a7a4b47
AA		 2199 case EUI64_ADDR_LEN:
2200 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2201 eui[0] ^= 2;
2202 break;
2203 default:
06a4c1c5 2204 return -1;
8a7a4b47
AA		 2205 }
2206
06a4c1c5 2207 return 0;
2208}
2209
cb6bf355
YH		 2210static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2211{
2212 union fwnet_hwaddr *ha;
2213
2214 if (dev->addr_len != FWNET_ALEN)
2215 return -1;
2216
2217 ha = (union fwnet_hwaddr *)dev->dev_addr;
2218
2219 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2220 eui[0] ^= 2;
2221 return 0;
2222}
2223
073a8e0e
YH		 2224static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2225{
2226 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2227 if (dev->addr_len != ARCNET_ALEN)
2228 return -1;
2229 memset(eui, 0, 7);
8e5e8f30 2230 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 2231 return 0;
2232}
2233
2234static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2235{
2236 if (dev->addr_len != INFINIBAND_ALEN)
2237 return -1;
2238 memcpy(eui, dev->dev_addr + 12, 8);
2239 eui[0] |= 2;
2240 return 0;
2241}
2242
c61393ea 2243static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2244{
9af28511
SH		 2245 if (addr == 0)
2246 return -1;
dfd982ba
YH		 2247 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2248 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2249 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2250 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2251 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2252 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2253 eui[1] = 0;
2254 eui[2] = 0x5E;
2255 eui[3] = 0xFE;
2256 memcpy(eui + 4, &addr, 4);
2257 return 0;
2258}
dfd982ba
YH		 2259
2260static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2261{
2262 if (dev->priv_flags & IFF_ISATAP)
2263 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2264 return -1;
2265}
2266
aee80b54 2267static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2268{
2269 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2270}
2271
e837735e
ND		 2272static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2273{
2274 memcpy(eui, dev->perm_addr, 3);
2275 memcpy(eui + 5, dev->perm_addr + 3, 3);
2276 eui[3] = 0xFF;
2277 eui[4] = 0xFE;
2278 eui[0] ^= 2;
2279 return 0;
2280}
2281
1da177e4
LT		 2282static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2283{
2284 switch (dev->type) {
2285 case ARPHRD_ETHER:
2286 case ARPHRD_FDDI:
073a8e0e 2287 return addrconf_ifid_eui48(eui, dev);
1da177e4 2288 case ARPHRD_ARCNET:
073a8e0e 2289 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2290 case ARPHRD_INFINIBAND:
073a8e0e 2291 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2292 case ARPHRD_SIT:
dfd982ba 2293 return addrconf_ifid_sit(eui, dev);
aee80b54 2294 case ARPHRD_IPGRE:
45ce0fd1 2295 case ARPHRD_TUNNEL:
aee80b54 2296 return addrconf_ifid_gre(eui, dev);
e74bccb8 2297 case ARPHRD_6LOWPAN:
8a7a4b47 2298 return addrconf_ifid_6lowpan(eui, dev);
cb6bf355
YH		 2299 case ARPHRD_IEEE1394:
2300 return addrconf_ifid_ieee1394(eui, dev);
e837735e 2301 case ARPHRD_TUNNEL6:
45ce0fd1 2302 case ARPHRD_IP6GRE:
9deb441c 2303 case ARPHRD_RAWIP:
e837735e 2304 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2305 }
2306 return -1;
2307}
2308
2309static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2310{
2311 int err = -1;
2312 struct inet6_ifaddr *ifp;
2313
2314 read_lock_bh(&idev->lock);
602582ca
HFS		 2315 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2316 if (ifp->scope > IFA_LINK)
2317 break;
1da177e4
LT		 2318 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2319 memcpy(eui, ifp->addr.s6_addr+8, 8);
2320 err = 0;
2321 break;
2322 }
2323 }
2324 read_unlock_bh(&idev->lock);
2325 return err;
2326}
2327
1da177e4 2328/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
9d6280da 2329static void ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2330{
1da177e4 2331regen:
955189ef 2332 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2333 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2334
2335 /*
2336 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2337 * check if generated address is not inappropriate
2338 *
2339 * - Reserved subnet anycast (RFC 2526)
2340 * 11111101 11....11 1xxxxxxx
c7dc89c0 2341 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2342 * 00-00-5E-FE-xx-xx-xx-xx
2343 * - value 0
2344 * - XXX: already assigned to an address on the device
2345 */
1ab1457c 2346 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2347 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2348 (idev->rndid[7]&0x80))
2349 goto regen;
2350 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2351 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2352 goto regen;
2353 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2354 goto regen;
2355 }
1da177e4
LT		 2356}
2357
9d6280da 2358static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2359{
1da177e4 2360 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
9d6280da 2361 ipv6_regen_rndid(idev);
1da177e4 2362}
1da177e4
LT		 2363
2364/*
2365 * Add prefix route.
2366 */
2367
2368static void
8308f3ff
DA		 2369addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2370 struct net_device *dev, unsigned long expires,
2371 u32 flags, gfp_t gfp_flags)
1da177e4 2372{
86872cb5 2373 struct fib6_config cfg = {
ca254490 2374 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
8308f3ff 2375 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
86872cb5
TG		 2376 .fc_ifindex = dev->ifindex,
2377 .fc_expires = expires,
2378 .fc_dst_len = plen,
2379 .fc_flags = RTF_UP | flags,
c346dca1 2380 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2381 .fc_protocol = RTPROT_KERNEL,
e8478e80 2382 .fc_type = RTN_UNICAST,
86872cb5 2383 };
1da177e4 2384
4e3fd7a0 2385 cfg.fc_dst = *pfx;
1da177e4
LT		 2386
2387 /* Prevent useless cloning on PtP SIT.
2388 This thing is done here expecting that the whole
2389 class of non-broadcast devices need not cloning.
2390 */
07a93626 2391#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2392 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2393 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2394#endif
1da177e4 2395
acb54e3c 2396 ip6_route_add(&cfg, gfp_flags, NULL);
1da177e4
LT		 2397}
2398
14ef37b6 2399
8d1c802b 2400static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
14ef37b6
AH		 2401 int plen,
2402 const struct net_device *dev,
2b2450ca
DA		 2403 u32 flags, u32 noflags,
2404 bool no_gw)
14ef37b6
AH		 2405{
2406 struct fib6_node *fn;
8d1c802b 2407 struct fib6_info *rt = NULL;
14ef37b6 2408 struct fib6_table *table;
ca254490 2409 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2410
ca254490 2411 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2412 if (!table)
14ef37b6
AH		 2413 return NULL;
2414
66f5d6ce 2415 rcu_read_lock();
38fbeeee 2416 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
14ef37b6
AH		 2417 if (!fn)
2418 goto out;
1f56a01f 2419
66f5d6ce 2420 for_each_fib6_node_rt_rcu(fn) {
f88d8ea6
DA		 2421 /* prefix routes only use builtin fib6_nh */
2422 if (rt->nh)
2423 continue;
2424
1cf844c7 2425 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
14ef37b6 2426 continue;
1cf844c7 2427 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2b2450ca 2428 continue;
93c2fb25 2429 if ((rt->fib6_flags & flags) != flags)
14ef37b6 2430 continue;
93c2fb25 2431 if ((rt->fib6_flags & noflags) != 0)
14ef37b6 2432 continue;
e873e4b9
WW		 2433 if (!fib6_info_hold_safe(rt))
2434 continue;
14ef37b6
AH		 2435 break;
2436 }
2437out:
66f5d6ce 2438 rcu_read_unlock();
14ef37b6
AH		 2439 return rt;
2440}
2441
2442
1da177e4
LT		 2443/* Create "default" multicast route to the interface */
2444
2445static void addrconf_add_mroute(struct net_device *dev)
2446{
86872cb5 2447 struct fib6_config cfg = {
ca254490 2448 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2449 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2450 .fc_ifindex = dev->ifindex,
2451 .fc_dst_len = 8,
2452 .fc_flags = RTF_UP,
e8478e80 2453 .fc_type = RTN_UNICAST,
c346dca1 2454 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2455 };
2456
2457 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2458
e500c6d3 2459 ip6_route_add(&cfg, GFP_KERNEL, NULL);
1da177e4
LT		 2460}
2461
1da177e4
LT		 2462static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2463{
2464 struct inet6_dev *idev;
2465
2466 ASSERT_RTNL();
2467
e21e8467 2468 idev = ipv6_find_idev(dev);
db0b99f5
SD		 2469 if (IS_ERR(idev))
2470 return idev;
64e724f6
BH		 2471
2472 if (idev->cnf.disable_ipv6)
2473 return ERR_PTR(-EACCES);
1da177e4
LT		 2474
2475 /* Add default multicast route */
ba46ee4c 2476 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
4af04aba 2477 addrconf_add_mroute(dev);
1da177e4 2478
1da177e4
LT		 2479 return idev;
2480}
2481
53bd6749
JP		 2482static void manage_tempaddrs(struct inet6_dev *idev,
2483 struct inet6_ifaddr *ifp,
2484 __u32 valid_lft, __u32 prefered_lft,
2485 bool create, unsigned long now)
2486{
2487 u32 flags;
2488 struct inet6_ifaddr *ift;
2489
2490 read_lock_bh(&idev->lock);
2491 /* update all temporary addresses in the list */
2492 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2493 int age, max_valid, max_prefered;
2494
2495 if (ifp != ift->ifpub)
2496 continue;
2497
2498 /* RFC 4941 section 3.3:
2499 * If a received option will extend the lifetime of a public
2500 * address, the lifetimes of temporary addresses should
2501 * be extended, subject to the overall constraint that no
2502 * temporary addresses should ever remain "valid" or "preferred"
2503 * for a time longer than (TEMP_VALID_LIFETIME) or
2504 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2505 */
2506 age = (now - ift->cstamp) / HZ;
2507 max_valid = idev->cnf.temp_valid_lft - age;
2508 if (max_valid < 0)
2509 max_valid = 0;
2510
2511 max_prefered = idev->cnf.temp_prefered_lft -
76506a98 2512 idev->desync_factor - age;
53bd6749
JP		 2513 if (max_prefered < 0)
2514 max_prefered = 0;
2515
2516 if (valid_lft > max_valid)
2517 valid_lft = max_valid;
2518
2519 if (prefered_lft > max_prefered)
2520 prefered_lft = max_prefered;
2521
2522 spin_lock(&ift->lock);
2523 flags = ift->flags;
2524 ift->valid_lft = valid_lft;
2525 ift->prefered_lft = prefered_lft;
2526 ift->tstamp = now;
2527 if (prefered_lft > 0)
2528 ift->flags &= ~IFA_F_DEPRECATED;
2529
2530 spin_unlock(&ift->lock);
2531 if (!(flags&IFA_F_TENTATIVE))
2532 ipv6_ifa_notify(0, ift);
2533 }
2534
2535 if ((create || list_empty(&idev->tempaddr_list)) &&
2536 idev->cnf.use_tempaddr > 0) {
2537 /* When a new public address is created as described
2538 * in [ADDRCONF], also create a new temporary address.
2539 * Also create a temporary address if it's enabled but
2540 * no temporary address currently exists.
2541 */
2542 read_unlock_bh(&idev->lock);
fffcefe9 2543 ipv6_create_tempaddr(ifp, NULL, false);
53bd6749
JP		 2544 } else {
2545 read_unlock_bh(&idev->lock);
2546 }
2547}
2548
cc9da6cc
BM		 2549static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2550{
d35a00b8
FJ		 2551 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2552 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc
BM		 2553}
2554
cc84b3c6
AA		 2555int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2556 const struct prefix_info *pinfo,
2557 struct inet6_dev *in6_dev,
2558 const struct in6_addr *addr, int addr_type,
2559 u32 addr_flags, bool sllao, bool tokenized,
2560 __u32 valid_lft, u32 prefered_lft)
4f672235
AA		 2561{
2562 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2563 int create = 0, update_lft = 0;
2564
2565 if (!ifp && valid_lft) {
2566 int max_addresses = in6_dev->cnf.max_addresses;
e6464b8c
DA		 2567 struct ifa6_config cfg = {
2568 .pfx = addr,
2569 .plen = pinfo->prefix_len,
2570 .ifa_flags = addr_flags,
2571 .valid_lft = valid_lft,
2572 .preferred_lft = prefered_lft,
2573 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2574 };
4f672235
AA		 2575
2576#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 2577 if ((net->ipv6.devconf_all->optimistic_dad ||
2578 in6_dev->cnf.optimistic_dad) &&
4f672235 2579 !net->ipv6.devconf_all->forwarding && sllao)
e6464b8c 2580 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
4f672235
AA		 2581#endif
2582
2583 /* Do not allow to create too much of autoconfigured
2584 * addresses; this would be too easy way to crash kernel.
2585 */
2586 if (!max_addresses ||
2587 ipv6_count_addresses(in6_dev) < max_addresses)
e6464b8c 2588 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
4f672235
AA		 2589
2590 if (IS_ERR_OR_NULL(ifp))
2591 return -1;
2592
4f672235
AA		 2593 create = 1;
2594 spin_lock_bh(&ifp->lock);
2595 ifp->flags |= IFA_F_MANAGETEMPADDR;
2596 ifp->cstamp = jiffies;
2597 ifp->tokenized = tokenized;
2598 spin_unlock_bh(&ifp->lock);
2599 addrconf_dad_start(ifp);
2600 }
2601
2602 if (ifp) {
2603 u32 flags;
2604 unsigned long now;
2605 u32 stored_lft;
2606
2607 /* update lifetime (RFC2462 5.5.3 e) */
2608 spin_lock_bh(&ifp->lock);
2609 now = jiffies;
2610 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2611 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2612 else
2613 stored_lft = 0;
f85f94b8 2614 if (!create && stored_lft) {
4f672235
AA		 2615 const u32 minimum_lft = min_t(u32,
2616 stored_lft, MIN_VALID_LIFETIME);
2617 valid_lft = max(valid_lft, minimum_lft);
2618
2619 /* RFC4862 Section 5.5.3e:
2620 * "Note that the preferred lifetime of the
2621 * corresponding address is always reset to
2622 * the Preferred Lifetime in the received
2623 * Prefix Information option, regardless of
2624 * whether the valid lifetime is also reset or
2625 * ignored."
2626 *
2627 * So we should always update prefered_lft here.
2628 */
2629 update_lft = 1;
2630 }
2631
2632 if (update_lft) {
2633 ifp->valid_lft = valid_lft;
2634 ifp->prefered_lft = prefered_lft;
2635 ifp->tstamp = now;
2636 flags = ifp->flags;
2637 ifp->flags &= ~IFA_F_DEPRECATED;
2638 spin_unlock_bh(&ifp->lock);
2639
2640 if (!(flags&IFA_F_TENTATIVE))
2641 ipv6_ifa_notify(0, ifp);
2642 } else
2643 spin_unlock_bh(&ifp->lock);
2644
2645 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2646 create, now);
2647
2648 in6_ifa_put(ifp);
2649 addrconf_verify();
2650 }
2651
2652 return 0;
2653}
cc84b3c6 2654EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
4f672235 2655
e6bff995 2656void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2657{
2658 struct prefix_info *pinfo;
2659 __u32 valid_lft;
2660 __u32 prefered_lft;
4f672235 2661 int addr_type, err;
64236f3f 2662 u32 addr_flags = 0;
1da177e4 2663 struct inet6_dev *in6_dev;
56d417b1 2664 struct net *net = dev_net(dev);
1da177e4
LT		 2665
2666 pinfo = (struct prefix_info *) opt;
1ab1457c 2667
1da177e4 2668 if (len < sizeof(struct prefix_info)) {
e32ac250 2669 netdev_dbg(dev, "addrconf: prefix option too short\n");
1da177e4
LT		 2670 return;
2671 }
1ab1457c 2672
1da177e4
LT		 2673 /*
2674 * Validation checks ([ADDRCONF], page 19)
2675 */
2676
2677 addr_type = ipv6_addr_type(&pinfo->prefix);
2678
2679 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2680 return;
2681
2682 valid_lft = ntohl(pinfo->valid);
2683 prefered_lft = ntohl(pinfo->prefered);
2684
2685 if (prefered_lft > valid_lft) {
e87cc472 2686 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2687 return;
2688 }
2689
2690 in6_dev = in6_dev_get(dev);
2691
63159f29 2692 if (!in6_dev) {
e87cc472
JP		 2693 net_dbg_ratelimited("addrconf: device %s not configured\n",
2694 dev->name);
1da177e4
LT		 2695 return;
2696 }
2697
2698 /*
2699 * Two things going on here:
2700 * 1) Add routes for on-link prefixes
2701 * 2) Configure prefixes with the auto flag set
2702 */
2703
4bed72e4 2704 if (pinfo->onlink) {
8d1c802b 2705 struct fib6_info *rt;
4bed72e4
YH		 2706 unsigned long rt_expires;
2707
6f704992
YH		 2708 /* Avoid arithmetic overflow. Really, we could
2709 * save rt_expires in seconds, likely valid_lft,
2710 * but it would require division in fib gc, that it
2711 * not good.
2712 */
4bed72e4
YH		 2713 if (HZ > USER_HZ)
2714 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2715 else
2716 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2717
4bed72e4
YH		 2718 if (addrconf_finite_timeout(rt_expires))
2719 rt_expires *= HZ;
1da177e4 2720
14ef37b6
AH		 2721 rt = addrconf_get_prefix_route(&pinfo->prefix,
2722 pinfo->prefix_len,
2723 dev,
2724 RTF_ADDRCONF | RTF_PREFIX_RT,
2b2450ca 2725 RTF_DEFAULT, true);
1da177e4 2726
14ef37b6 2727 if (rt) {
6f704992
YH		 2728 /* Autoconf prefix route */
2729 if (valid_lft == 0) {
afb1d4b5 2730 ip6_del_rt(net, rt);
6f704992 2731 rt = NULL;
4bed72e4 2732 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2733 /* not infinity */
14895687 2734 fib6_set_expires(rt, jiffies + rt_expires);
6f704992 2735 } else {
14895687 2736 fib6_clean_expires(rt);
1da177e4
LT		 2737 }
2738 } else if (valid_lft) {
6f704992 2739 clock_t expires = 0;
4bed72e4
YH		 2740 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2741 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2742 /* not infinity */
2743 flags |= RTF_EXPIRES;
2744 expires = jiffies_to_clock_t(rt_expires);
2745 }
1da177e4 2746 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
8308f3ff
DA		 2747 0, dev, expires, flags,
2748 GFP_ATOMIC);
1da177e4 2749 }
93531c67 2750 fib6_info_release(rt);
1da177e4
LT		 2751 }
2752
2753 /* Try to figure out our local address for this prefix */
2754
2755 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1da177e4 2756 struct in6_addr addr;
f997c55c 2757 bool tokenized = false, dev_addr_generated = false;
1da177e4
LT		 2758
2759 if (pinfo->prefix_len == 64) {
2760 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2761
2762 if (!ipv6_addr_any(&in6_dev->token)) {
2763 read_lock_bh(&in6_dev->lock);
2764 memcpy(addr.s6_addr + 8,
2765 in6_dev->token.s6_addr + 8, 8);
2766 read_unlock_bh(&in6_dev->lock);
617fe29d 2767 tokenized = true;
cc9da6cc 2768 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2769 !ipv6_generate_stable_address(&addr, 0,
2770 in6_dev)) {
64236f3f 2771 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2772 goto ok;
f53adae4
DB		 2773 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2774 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
4f672235 2775 goto put;
f997c55c
AA		 2776 } else {
2777 dev_addr_generated = true;
1da177e4
LT		 2778 }
2779 goto ok;
2780 }
e87cc472
JP		 2781 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2782 pinfo->prefix_len);
4f672235 2783 goto put;
1da177e4
LT		 2784
2785ok:
4f672235
AA		 2786 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2787 &addr, addr_type,
2788 addr_flags, sllao,
2789 tokenized, valid_lft,
2790 prefered_lft);
2791 if (err)
2792 goto put;
f997c55c
AA		 2793
2794 /* Ignore error case here because previous prefix add addr was
2795 * successful which will be notified.
2796 */
2797 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2798 addr_type, addr_flags, sllao,
2799 tokenized, valid_lft,
2800 prefered_lft,
2801 dev_addr_generated);
1da177e4
LT		 2802 }
2803 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
4f672235 2804put:
1da177e4
LT		 2805 in6_dev_put(in6_dev);
2806}
2807
2808/*
2809 * Set destination address.
2810 * Special case for SIT interfaces where we create a new "virtual"
2811 * device.
2812 */
af284937 2813int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2814{
2815 struct in6_ifreq ireq;
2816 struct net_device *dev;
2817 int err = -EINVAL;
2818
2819 rtnl_lock();
2820
2821 err = -EFAULT;
2822 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2823 goto err_exit;
2824
af284937 2825 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2826
2827 err = -ENODEV;
63159f29 2828 if (!dev)
1da177e4
LT		 2829 goto err_exit;
2830
07a93626 2831#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2832 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2833 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2834 struct ifreq ifr;
1da177e4
LT		 2835 struct ip_tunnel_parm p;
2836
2837 err = -EADDRNOTAVAIL;
2838 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2839 goto err_exit;
2840
2841 memset(&p, 0, sizeof(p));
2842 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2843 p.iph.saddr = 0;
2844 p.iph.version = 4;
2845 p.iph.ihl = 5;
2846 p.iph.protocol = IPPROTO_IPV6;
2847 p.iph.ttl = 64;
d20b3109 2848 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2849
5bc3eb7e
SH		 2850 if (ops->ndo_do_ioctl) {
2851 mm_segment_t oldfs = get_fs();
2852
2853 set_fs(KERNEL_DS);
2854 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2855 set_fs(oldfs);
2856 } else
2857 err = -EOPNOTSUPP;
1da177e4
LT		 2858
2859 if (err == 0) {
2860 err = -ENOBUFS;
af284937
DL		 2861 dev = __dev_get_by_name(net, p.name);
2862 if (!dev)
1da177e4 2863 goto err_exit;
00f54e68 2864 err = dev_open(dev, NULL);
1da177e4
LT		 2865 }
2866 }
0be669bb 2867#endif
1da177e4
LT		 2868
2869err_exit:
2870 rtnl_unlock();
2871 return err;
2872}
2873
93a714d6
MC		 2874static int ipv6_mc_config(struct sock *sk, bool join,
2875 const struct in6_addr *addr, int ifindex)
2876{
2877 int ret;
2878
2879 ASSERT_RTNL();
2880
2881 lock_sock(sk);
2882 if (join)
54ff9ef3 2883 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2884 else
54ff9ef3 2885 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2886 release_sock(sk);
2887
2888 return ret;
2889}
2890
1da177e4
LT		 2891/*
2892 * Manual configuration of address on an interface
2893 */
479840ff 2894static int inet6_addr_add(struct net *net, int ifindex,
19b1518c 2895 struct ifa6_config *cfg,
de95e047 2896 struct netlink_ext_ack *extack)
1da177e4
LT		 2897{
2898 struct inet6_ifaddr *ifp;
2899 struct inet6_dev *idev;
2900 struct net_device *dev;
93a714d6
MC		 2901 unsigned long timeout;
2902 clock_t expires;
6f704992 2903 u32 flags;
1da177e4
LT		 2904
2905 ASSERT_RTNL();
1ab1457c 2906
19b1518c 2907 if (cfg->plen > 128)
24ef0da7
TG		 2908 return -EINVAL;
2909
0778769d 2910 /* check the lifetime */
19b1518c 2911 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
0778769d
NT		 2912 return -EINVAL;
2913
19b1518c 2914 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
53bd6749
JP		 2915 return -EINVAL;
2916
af284937
DL		 2917 dev = __dev_get_by_index(net, ifindex);
2918 if (!dev)
1da177e4 2919 return -ENODEV;
1ab1457c 2920
64e724f6
BH		 2921 idev = addrconf_add_dev(dev);
2922 if (IS_ERR(idev))
2923 return PTR_ERR(idev);
1da177e4 2924
19b1518c 2925 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
93a714d6 2926 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
19b1518c 2927 true, cfg->pfx, ifindex);
93a714d6
MC		 2928
2929 if (ret < 0)
2930 return ret;
2931 }
2932
19b1518c 2933 cfg->scope = ipv6_addr_scope(cfg->pfx);
1da177e4 2934
19b1518c 2935 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4bed72e4
YH		 2936 if (addrconf_finite_timeout(timeout)) {
2937 expires = jiffies_to_clock_t(timeout * HZ);
19b1518c 2938 cfg->valid_lft = timeout;
6f704992 2939 flags = RTF_EXPIRES;
4bed72e4
YH		 2940 } else {
2941 expires = 0;
2942 flags = 0;
19b1518c 2943 cfg->ifa_flags |= IFA_F_PERMANENT;
6f704992 2944 }
0778769d 2945
19b1518c 2946 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4bed72e4
YH		 2947 if (addrconf_finite_timeout(timeout)) {
2948 if (timeout == 0)
19b1518c
DA		 2949 cfg->ifa_flags |= IFA_F_DEPRECATED;
2950 cfg->preferred_lft = timeout;
4bed72e4 2951 }
0778769d 2952
19b1518c 2953 ifp = ipv6_add_addr(idev, cfg, true, extack);
1da177e4 2954 if (!IS_ERR(ifp)) {
19b1518c 2955 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
8308f3ff
DA		 2956 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2957 ifp->rt_priority, dev, expires,
2958 flags, GFP_KERNEL);
761aac73
TH		 2959 }
2960
a2d481b3
LB		 2961 /* Send a netlink notification if DAD is enabled and
2962 * optimistic flag is not set
2963 */
2964 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2965 ipv6_ifa_notify(0, ifp);
95c385b4
NH		 2966 /*
2967 * Note that section 3.1 of RFC 4429 indicates
2968 * that the Optimistic flag should not be set for
2969 * manually configured addresses
2970 */
cf22f9a2 2971 addrconf_dad_start(ifp);
19b1518c
DA		 2972 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2973 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2974 cfg->preferred_lft, true, jiffies);
1da177e4 2975 in6_ifa_put(ifp);
c15b1cca 2976 addrconf_verify_rtnl();
1da177e4 2977 return 0;
19b1518c
DA		 2978 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2979 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
2980 cfg->pfx, ifindex);
1da177e4
LT		 2981 }
2982
2983 return PTR_ERR(ifp);
2984}
2985
6046d5b4
HK		 2986static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2987 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2988{
2989 struct inet6_ifaddr *ifp;
2990 struct inet6_dev *idev;
2991 struct net_device *dev;
1ab1457c 2992
24ef0da7
TG		 2993 if (plen > 128)
2994 return -EINVAL;
2995
af284937
DL		 2996 dev = __dev_get_by_index(net, ifindex);
2997 if (!dev)
1da177e4
LT		 2998 return -ENODEV;
2999
e5d08d71 3000 idev = __in6_dev_get(dev);
63159f29 3001 if (!idev)
1da177e4
LT		 3002 return -ENXIO;
3003
3004 read_lock_bh(&idev->lock);
502a2ffd 3005 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 3006 if (ifp->prefix_len == plen &&
3007 ipv6_addr_equal(pfx, &ifp->addr)) {
3008 in6_ifa_hold(ifp);
3009 read_unlock_bh(&idev->lock);
1ab1457c 3010
6046d5b4
HK		 3011 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3012 (ifa_flags & IFA_F_MANAGETEMPADDR))
3013 manage_tempaddrs(idev, ifp, 0, 0, false,
3014 jiffies);
1da177e4 3015 ipv6_del_addr(ifp);
6046d5b4 3016 addrconf_verify_rtnl();
93a714d6
MC		 3017 if (ipv6_addr_is_multicast(pfx)) {
3018 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3019 false, pfx, dev->ifindex);
3020 }
1da177e4
LT		 3021 return 0;
3022 }
3023 }
3024 read_unlock_bh(&idev->lock);
3025 return -EADDRNOTAVAIL;
3026}
3027
3028
af284937 3029int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4 3030{
19b1518c
DA		 3031 struct ifa6_config cfg = {
3032 .ifa_flags = IFA_F_PERMANENT,
3033 .preferred_lft = INFINITY_LIFE_TIME,
3034 .valid_lft = INFINITY_LIFE_TIME,
3035 };
1da177e4
LT		 3036 struct in6_ifreq ireq;
3037 int err;
1ab1457c 3038
af31f412 3039 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 3040 return -EPERM;
1ab1457c 3041
1da177e4
LT		 3042 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3043 return -EFAULT;
3044
19b1518c
DA		 3045 cfg.pfx = &ireq.ifr6_addr;
3046 cfg.plen = ireq.ifr6_prefixlen;
3047
1da177e4 3048 rtnl_lock();
19b1518c 3049 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
1da177e4
LT		 3050 rtnl_unlock();
3051 return err;
3052}
3053
af284937 3054int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 3055{
3056 struct in6_ifreq ireq;
3057 int err;
1ab1457c 3058
af31f412 3059 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 3060 return -EPERM;
3061
3062 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3063 return -EFAULT;
3064
3065 rtnl_lock();
6046d5b4 3066 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 3067 ireq.ifr6_prefixlen);
1da177e4
LT		 3068 rtnl_unlock();
3069 return err;
3070}
3071
b5f348e5
IJ		 3072static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3073 int plen, int scope)
3074{
3075 struct inet6_ifaddr *ifp;
e6464b8c
DA		 3076 struct ifa6_config cfg = {
3077 .pfx = addr,
3078 .plen = plen,
3079 .ifa_flags = IFA_F_PERMANENT,
3080 .valid_lft = INFINITY_LIFE_TIME,
3081 .preferred_lft = INFINITY_LIFE_TIME,
3082 .scope = scope
3083 };
b5f348e5 3084
e6464b8c 3085 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
b5f348e5
IJ		 3086 if (!IS_ERR(ifp)) {
3087 spin_lock_bh(&ifp->lock);
3088 ifp->flags &= ~IFA_F_TENTATIVE;
3089 spin_unlock_bh(&ifp->lock);
764d3be6 3090 rt_genid_bump_ipv6(dev_net(idev->dev));
b5f348e5
IJ		 3091 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3092 in6_ifa_put(ifp);
3093 }
3094}
3095
07a93626 3096#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3097static void sit_add_v4_addrs(struct inet6_dev *idev)
3098{
1da177e4
LT		 3099 struct in6_addr addr;
3100 struct net_device *dev;
c346dca1 3101 struct net *net = dev_net(idev->dev);
929c9cf3 3102 int scope, plen;
f0e2acfa 3103 u32 pflags = 0;
1da177e4
LT		 3104
3105 ASSERT_RTNL();
3106
3107 memset(&addr, 0, sizeof(struct in6_addr));
3108 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3109
3110 if (idev->dev->flags&IFF_POINTOPOINT) {
3111 addr.s6_addr32[0] = htonl(0xfe800000);
3112 scope = IFA_LINK;
929c9cf3 3113 plen = 64;
1da177e4
LT		 3114 } else {
3115 scope = IPV6_ADDR_COMPATv4;
929c9cf3 3116 plen = 96;
f0e2acfa 3117 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 3118 }
3119
3120 if (addr.s6_addr32[3]) {
929c9cf3 3121 add_addr(idev, &addr, plen, scope);
8308f3ff 3122 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
e500c6d3 3123 GFP_KERNEL);
1da177e4
LT		 3124 return;
3125 }
3126
6fda7350 3127 for_each_netdev(net, dev) {
8e5e8f30 3128 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 3129 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 3130 struct in_ifaddr *ifa;
1da177e4
LT		 3131 int flag = scope;
3132
cd5a411d 3133 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
1da177e4
LT		 3134 addr.s6_addr32[3] = ifa->ifa_local;
3135
3136 if (ifa->ifa_scope == RT_SCOPE_LINK)
3137 continue;
3138 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3139 if (idev->dev->flags&IFF_POINTOPOINT)
3140 continue;
3141 flag |= IFA_HOST;
3142 }
1da177e4 3143
b5f348e5 3144 add_addr(idev, &addr, plen, flag);
8308f3ff 3145 addrconf_prefix_route(&addr, plen, 0, idev->dev,
e500c6d3 3146 0, pflags, GFP_KERNEL);
1da177e4
LT		 3147 }
3148 }
1ab1457c 3149 }
1da177e4 3150}
0be669bb 3151#endif
1da177e4
LT		 3152
3153static void init_loopback(struct net_device *dev)
3154{
3155 struct inet6_dev *idev;
1da177e4
LT		 3156
3157 /* ::1 */
3158
3159 ASSERT_RTNL();
3160
e5d08d71 3161 idev = ipv6_find_idev(dev);
db0b99f5 3162 if (IS_ERR(idev)) {
91df42be 3163 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3164 return;
3165 }
3166
b5f348e5 3167 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 3168}
3169
2ad3ed59
AA		 3170void addrconf_add_linklocal(struct inet6_dev *idev,
3171 const struct in6_addr *addr, u32 flags)
1da177e4 3172{
e6464b8c
DA		 3173 struct ifa6_config cfg = {
3174 .pfx = addr,
3175 .plen = 64,
3176 .ifa_flags = flags | IFA_F_PERMANENT,
3177 .valid_lft = INFINITY_LIFE_TIME,
3178 .preferred_lft = INFINITY_LIFE_TIME,
3179 .scope = IFA_LINK
3180 };
8e5e8f30 3181 struct inet6_ifaddr *ifp;
95c385b4
NH		 3182
3183#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 3184 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3185 idev->cnf.optimistic_dad) &&
702beb87 3186 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
e6464b8c 3187 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
95c385b4 3188#endif
1da177e4 3189
e6464b8c 3190 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
1da177e4 3191 if (!IS_ERR(ifp)) {
8308f3ff 3192 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
acb54e3c 3193 0, 0, GFP_ATOMIC);
cf22f9a2 3194 addrconf_dad_start(ifp);
1da177e4
LT		 3195 in6_ifa_put(ifp);
3196 }
3197}
2ad3ed59 3198EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
1da177e4 3199
622c81d5
HFS		 3200static bool ipv6_reserved_interfaceid(struct in6_addr address)
3201{
3202 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3203 return true;
3204
3205 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3206 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3207 return true;
3208
3209 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3210 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3211 return true;
3212
3213 return false;
3214}
3215
3216static int ipv6_generate_stable_address(struct in6_addr *address,
3217 u8 dad_count,
3218 const struct inet6_dev *idev)
3219{
622c81d5
HFS		 3220 static DEFINE_SPINLOCK(lock);
3221 static __u32 digest[SHA_DIGEST_WORDS];
3222 static __u32 workspace[SHA_WORKSPACE_WORDS];
3223
3224 static union {
3225 char __data[SHA_MESSAGE_BYTES];
3226 struct {
3227 struct in6_addr secret;
ff40217e 3228 __be32 prefix[2];
622c81d5
HFS		 3229 unsigned char hwaddr[MAX_ADDR_LEN];
3230 u8 dad_count;
3231 } __packed;
3232 } data;
3233
3234 struct in6_addr secret;
3235 struct in6_addr temp;
3236 struct net *net = dev_net(idev->dev);
3237
3238 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3239
3240 if (idev->cnf.stable_secret.initialized)
3241 secret = idev->cnf.stable_secret.secret;
3242 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3243 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3244 else
3245 return -1;
3246
3247retry:
3248 spin_lock_bh(&lock);
3249
3250 sha_init(digest);
3251 memset(&data, 0, sizeof(data));
3252 memset(workspace, 0, sizeof(workspace));
3253 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3254 data.prefix[0] = address->s6_addr32[0];
3255 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3256 data.secret = secret;
3257 data.dad_count = dad_count;
3258
3259 sha_transform(digest, data.__data, workspace);
3260
3261 temp = *address;
ff40217e
HFS		 3262 temp.s6_addr32[2] = (__force __be32)digest[0];
3263 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3264
3265 spin_unlock_bh(&lock);
3266
3267 if (ipv6_reserved_interfaceid(temp)) {
3268 dad_count++;
1855b7c3 3269 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3270 return -1;
3271 goto retry;
3272 }
3273
3274 *address = temp;
3275 return 0;
3276}
3277
cc9da6cc
BM		 3278static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3279{
3280 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3281
3282 if (s->initialized)
3283 return;
3284 s = &idev->cnf.stable_secret;
3285 get_random_bytes(&s->secret, sizeof(s->secret));
3286 s->initialized = true;
3287}
3288
bc91b0f0
JP		 3289static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3290{
622c81d5
HFS		 3291 struct in6_addr addr;
3292
ca254490
DA		 3293 /* no link local addresses on L3 master devices */
3294 if (netif_is_l3_master(idev->dev))
3295 return;
3296
622c81d5 3297 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3298
d35a00b8 3299 switch (idev->cnf.addr_gen_mode) {
cc9da6cc
BM		 3300 case IN6_ADDR_GEN_MODE_RANDOM:
3301 ipv6_gen_mode_random_init(idev);
3302 /* fallthrough */
3303 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3304 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3305 addrconf_add_linklocal(idev, &addr,
3306 IFA_F_STABLE_PRIVACY);
622c81d5 3307 else if (prefix_route)
8308f3ff 3308 addrconf_prefix_route(&addr, 64, 0, idev->dev,
acb54e3c 3309 0, 0, GFP_KERNEL);
cc9da6cc
BM		 3310 break;
3311 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3312 /* addrconf_add_linklocal also adds a prefix_route and we
3313 * only need to care about prefix routes if ipv6_generate_eui64
3314 * couldn't generate one.
3315 */
3316 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3317 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0 3318 else if (prefix_route)
8308f3ff 3319 addrconf_prefix_route(&addr, 64, 0, idev->dev,
27b10608 3320 0, 0, GFP_KERNEL);
cc9da6cc
BM		 3321 break;
3322 case IN6_ADDR_GEN_MODE_NONE:
3323 default:
3324 /* will not add any link local address */
3325 break;
bc91b0f0
JP		 3326 }
3327}
3328
1da177e4
LT		 3329static void addrconf_dev_config(struct net_device *dev)
3330{
8e5e8f30 3331 struct inet6_dev *idev;
1da177e4
LT		 3332
3333 ASSERT_RTNL();
3334
74235a25
HX		 3335 if ((dev->type != ARPHRD_ETHER) &&
3336 (dev->type != ARPHRD_FDDI) &&
74235a25 3337 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3338 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3339 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3340 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc 3341 (dev->type != ARPHRD_6LOWPAN) &&
45ce0fd1
FJ		 3342 (dev->type != ARPHRD_IP6GRE) &&
3343 (dev->type != ARPHRD_IPGRE) &&
3344 (dev->type != ARPHRD_TUNNEL) &&
9deb441c
SAK		 3345 (dev->type != ARPHRD_NONE) &&
3346 (dev->type != ARPHRD_RAWIP)) {
74235a25
HX		 3347 /* Alas, we support only Ethernet autoconfiguration. */
3348 return;
3349 }
3350
1da177e4 3351 idev = addrconf_add_dev(dev);
64e724f6 3352 if (IS_ERR(idev))
1da177e4
LT		 3353 return;
3354
cc9da6cc
BM		 3355 /* this device type has no EUI support */
3356 if (dev->type == ARPHRD_NONE &&
d35a00b8
FJ		 3357 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3358 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc 3359
bc91b0f0 3360 addrconf_addr_gen(idev, false);
1da177e4
LT		 3361}
3362
07a93626 3363#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3364static void addrconf_sit_config(struct net_device *dev)
3365{
3366 struct inet6_dev *idev;
3367
3368 ASSERT_RTNL();
3369
1ab1457c
YH		 3370 /*
3371 * Configure the tunnel with one of our IPv4
3372 * addresses... we should configure all of
1da177e4
LT		 3373 * our v4 addrs in the tunnel
3374 */
3375
e5d08d71 3376 idev = ipv6_find_idev(dev);
db0b99f5 3377 if (IS_ERR(idev)) {
91df42be 3378 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3379 return;
3380 }
3381
c7dc89c0 3382 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3383 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3384 return;
3385 }
3386
1da177e4
LT		 3387 sit_add_v4_addrs(idev);
3388
62b54dd9 3389 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3390 addrconf_add_mroute(dev);
1da177e4 3391}
0be669bb 3392#endif
1da177e4 3393
07a93626 3394#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3395static void addrconf_gre_config(struct net_device *dev)
3396{
3397 struct inet6_dev *idev;
aee80b54 3398
aee80b54 3399 ASSERT_RTNL();
3400
e5d08d71 3401 idev = ipv6_find_idev(dev);
db0b99f5 3402 if (IS_ERR(idev)) {
91df42be 3403 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3404 return;
3405 }
3406
bc91b0f0 3407 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3408 if (dev->flags & IFF_POINTOPOINT)
3409 addrconf_add_mroute(dev);
aee80b54 3410}
3411#endif
3412
afb1d4b5
DA		 3413static int fixup_permanent_addr(struct net *net,
3414 struct inet6_dev *idev,
f1705ec1
DA		 3415 struct inet6_ifaddr *ifp)
3416{
93c2fb25 3417 /* !fib6_node means the host route was removed from the
8048ced9
DA		 3418 * FIB, for example, if 'lo' device is taken down. In that
3419 * case regenerate the host route.
3420 */
93c2fb25 3421 if (!ifp->rt || !ifp->rt->fib6_node) {
360a9887 3422 struct fib6_info *f6i, *prev;
f1705ec1 3423
360a9887
DA		 3424 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3425 GFP_ATOMIC);
3426 if (IS_ERR(f6i))
3427 return PTR_ERR(f6i);
f1705ec1 3428
8048ced9
DA		 3429 /* ifp->rt can be accessed outside of rtnl */
3430 spin_lock(&ifp->lock);
3431 prev = ifp->rt;
360a9887 3432 ifp->rt = f6i;
8048ced9
DA		 3433 spin_unlock(&ifp->lock);
3434
93531c67 3435 fib6_info_release(prev);
f1705ec1
DA		 3436 }
3437
3438 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3439 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
8308f3ff
DA		 3440 ifp->rt_priority, idev->dev, 0, 0,
3441 GFP_ATOMIC);
f1705ec1
DA		 3442 }
3443
6d717134
DA		 3444 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3445 addrconf_dad_start(ifp);
f1705ec1
DA		 3446
3447 return 0;
3448}
3449
afb1d4b5 3450static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
f1705ec1
DA		 3451{
3452 struct inet6_ifaddr *ifp, *tmp;
3453 struct inet6_dev *idev;
3454
3455 idev = __in6_dev_get(dev);
3456 if (!idev)
3457 return;
3458
3459 write_lock_bh(&idev->lock);
3460
3461 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3462 if ((ifp->flags & IFA_F_PERMANENT) &&
afb1d4b5 3463 fixup_permanent_addr(net, idev, ifp) < 0) {
f1705ec1 3464 write_unlock_bh(&idev->lock);
e669b869 3465 in6_ifa_hold(ifp);
f1705ec1
DA		 3466 ipv6_del_addr(ifp);
3467 write_lock_bh(&idev->lock);
3468
3469 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3470 idev->dev->name, &ifp->addr);
3471 }
3472 }
3473
3474 write_unlock_bh(&idev->lock);
3475}
3476
1ab1457c 3477static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3478 void *ptr)
1da177e4 3479{
351638e7 3480 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
896585d4 3481 struct netdev_notifier_change_info *change_info;
4f7f34ea 3482 struct netdev_notifier_changeupper_info *info;
748e2d93 3483 struct inet6_dev *idev = __in6_dev_get(dev);
60abc0be 3484 struct net *net = dev_net(dev);
c5e33bdd 3485 int run_pending = 0;
b217d616 3486 int err;
1da177e4 3487
e21e8467 3488 switch (event) {
45ba9dd2 3489 case NETDEV_REGISTER:
74235a25 3490 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3491 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3492 if (IS_ERR(idev))
3493 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3494 }
3495 break;
bcdd553f 3496
b7b0b1d2
AD		 3497 case NETDEV_CHANGEMTU:
3498 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3499 if (dev->mtu < IPV6_MIN_MTU) {
60abc0be 3500 addrconf_ifdown(dev, dev != net->loopback_dev);
b7b0b1d2
AD		 3501 break;
3502 }
3503
3504 if (idev) {
3505 rt6_mtu_change(dev, dev->mtu);
3506 idev->cnf.mtu6 = dev->mtu;
3507 break;
3508 }
3509
3510 /* allocate new idev */
3511 idev = ipv6_add_dev(dev);
3512 if (IS_ERR(idev))
3513 break;
3514
3515 /* device is still not ready */
3516 if (!(idev->if_flags & IF_READY))
3517 break;
3518
3519 run_pending = 1;
3520
3521 /* fall through */
3522
1da177e4 3523 case NETDEV_UP:
3c21edbd 3524 case NETDEV_CHANGE:
c2edacf8
JV		 3525 if (dev->flags & IFF_SLAVE)
3526 break;
3527
3ce62a84
WC		 3528 if (idev && idev->cnf.disable_ipv6)
3529 break;
3530
3c21edbd 3531 if (event == NETDEV_UP) {
38bd10c4 3532 /* restore routes for permanent addresses */
afb1d4b5 3533 addrconf_permanent_addr(net, dev);
38bd10c4 3534
1f372c7b 3535 if (!addrconf_link_ready(dev)) {
3c21edbd 3536 /* device is not ready yet. */
7c62b8dd
LR		 3537 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3538 dev->name);
3c21edbd
YH		 3539 break;
3540 }
99081049 3541
d31c7b8f
EP		 3542 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3543 idev = ipv6_add_dev(dev);
3544
a317a2f1 3545 if (!IS_ERR_OR_NULL(idev)) {
99081049 3546 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3547 run_pending = 1;
3548 }
b7b0b1d2 3549 } else if (event == NETDEV_CHANGE) {
1f372c7b 3550 if (!addrconf_link_ready(dev)) {
3c21edbd 3551 /* device is still not ready. */
27c6fa73 3552 rt6_sync_down_dev(dev, event);
3c21edbd
YH		 3553 break;
3554 }
3555
896585d4 3556 if (!IS_ERR_OR_NULL(idev)) {
a088d1d7
LL		 3557 if (idev->if_flags & IF_READY) {
3558 /* device is already configured -
3559 * but resend MLD reports, we might
3560 * have roamed and need to update
3561 * multicast snooping switches
3562 */
3563 ipv6_mc_up(idev);
896585d4
HL		 3564 change_info = ptr;
3565 if (change_info->flags_changed & IFF_NOARP)
3566 addrconf_dad_run(idev, true);
27c6fa73 3567 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3c21edbd 3568 break;
a088d1d7 3569 }
3c21edbd
YH		 3570 idev->if_flags |= IF_READY;
3571 }
3572
f3213831
JP		 3573 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3574 dev->name);
3c21edbd 3575
c5e33bdd 3576 run_pending = 1;
3c21edbd
YH		 3577 }
3578
e21e8467 3579 switch (dev->type) {
07a93626 3580#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3581 case ARPHRD_SIT:
3582 addrconf_sit_config(dev);
3583 break;
aee80b54 3584#endif
07a93626 3585#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3586 case ARPHRD_IPGRE:
3587 addrconf_gre_config(dev);
3588 break;
0be669bb 3589#endif
1da177e4
LT		 3590 case ARPHRD_LOOPBACK:
3591 init_loopback(dev);
3592 break;
3593
3594 default:
3595 addrconf_dev_config(dev);
3596 break;
3ff50b79 3597 }
bcdd553f 3598
a317a2f1 3599 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd 3600 if (run_pending)
896585d4 3601 addrconf_dad_run(idev, false);
c5e33bdd 3602
2127d95a
IS		 3603 /* Device has an address by now */
3604 rt6_sync_up(dev, RTNH_F_DEAD);
3605
bcdd553f
SH		 3606 /*
3607 * If the MTU changed during the interface down,
3608 * when the interface up, the changed MTU must be
3609 * reflected in the idev as well as routers.
1da177e4 3610 */
bcdd553f
SH		 3611 if (idev->cnf.mtu6 != dev->mtu &&
3612 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3613 rt6_mtu_change(dev, dev->mtu);
3614 idev->cnf.mtu6 = dev->mtu;
3615 }
3616 idev->tstamp = jiffies;
3617 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3618
3619 /*
3620 * If the changed mtu during down is lower than
3621 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3622 */
3623 if (dev->mtu < IPV6_MIN_MTU)
60abc0be 3624 addrconf_ifdown(dev, dev != net->loopback_dev);
1da177e4
LT		 3625 }
3626 break;
3627
1da177e4
LT		 3628 case NETDEV_DOWN:
3629 case NETDEV_UNREGISTER:
3630 /*
3631 * Remove all addresses from this interface.
3632 */
3633 addrconf_ifdown(dev, event != NETDEV_DOWN);
3634 break;
3c21edbd 3635
1da177e4 3636 case NETDEV_CHANGENAME:
1da177e4 3637 if (idev) {
5632c515 3638 snmp6_unregister_dev(idev);
408c4768 3639 addrconf_sysctl_unregister(idev);
a317a2f1 3640 err = addrconf_sysctl_register(idev);
b217d616
HX		 3641 if (err)
3642 return notifier_from_errno(err);
a317a2f1
WC		 3643 err = snmp6_register_dev(idev);
3644 if (err) {
3645 addrconf_sysctl_unregister(idev);
3646 return notifier_from_errno(err);
3647 }
5632c515 3648 }
1da177e4 3649 break;
bcdd553f 3650
93d9b7d7
JP		 3651 case NETDEV_PRE_TYPE_CHANGE:
3652 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3653 if (idev)
3654 addrconf_type_change(dev, event);
75c78500 3655 break;
4f7f34ea
DA		 3656
3657 case NETDEV_CHANGEUPPER:
3658 info = ptr;
3659
3660 /* flush all routes if dev is linked to or unlinked from
3661 * an L3 master device (e.g., VRF)
3662 */
3663 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3664 addrconf_ifdown(dev, 0);
3ff50b79 3665 }
1da177e4
LT		 3666
3667 return NOTIFY_OK;
3668}
3669
3670/*
3671 * addrconf module should be notified of a device going up
3672 */
3673static struct notifier_block ipv6_dev_notf = {
3674 .notifier_call = addrconf_notify,
242d3a49 3675 .priority = ADDRCONF_NOTIFY_PRIORITY,
1da177e4
LT		 3676};
3677
93d9b7d7 3678static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3679{
3680 struct inet6_dev *idev;
3681 ASSERT_RTNL();
3682
3683 idev = __in6_dev_get(dev);
3684
93d9b7d7 3685 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3686 ipv6_mc_remap(idev);
93d9b7d7 3687 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3688 ipv6_mc_unmap(idev);
3689}
3690
70af921d
DA		 3691static bool addr_is_local(const struct in6_addr *addr)
3692{
3693 return ipv6_addr_type(addr) &
3694 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3695}
3696
1da177e4
LT		 3697static int addrconf_ifdown(struct net_device *dev, int how)
3698{
4c981e28 3699 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN;
c346dca1 3700 struct net *net = dev_net(dev);
502a2ffd 3701 struct inet6_dev *idev;
f1705ec1 3702 struct inet6_ifaddr *ifa, *tmp;
0aef78aa 3703 bool keep_addr = false;
73a8bd74 3704 int state, i;
1da177e4
LT		 3705
3706 ASSERT_RTNL();
3707
4c981e28 3708 rt6_disable_ip(dev, event);
1da177e4
LT		 3709
3710 idev = __in6_dev_get(dev);
63159f29 3711 if (!idev)
1da177e4
LT		 3712 return -ENODEV;
3713
bcdd553f
SH		 3714 /*
3715 * Step 1: remove reference to ipv6 device from parent device.
3716 * Do not dev_put!
1da177e4 3717 */
439e2385 3718 if (how) {
1da177e4 3719 idev->dead = 1;
8814c4b5
YH		 3720
3721 /* protected by rtnl_lock */
a9b3cd7f 3722 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3723
3724 /* Step 1.5: remove snmp6 entry */
3725 snmp6_unregister_dev(idev);
3726
3727 }
3728
f1705ec1
DA		 3729 /* combine the user config with event to determine if permanent
3730 * addresses are to be removed from address hash table
3731 */
0aef78aa
IV		 3732 if (!how && !idev->cnf.disable_ipv6) {
3733 /* aggregate the system setting and interface setting */
3734 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3735
3736 if (!_keep_addr)
3737 _keep_addr = idev->cnf.keep_addr_on_down;
3738
3739 keep_addr = (_keep_addr > 0);
3740 }
f1705ec1 3741
73a8bd74
DM		 3742 /* Step 2: clear hash table */
3743 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3744 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3745
3746 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3747restart:
b67bfe0d 3748 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3749 if (ifa->idev == idev) {
c15b1cca 3750 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3751 /* combined flag + permanent flag decide if
3752 * address is retained on a down event
3753 */
3754 if (!keep_addr ||
70af921d
DA		 3755 !(ifa->flags & IFA_F_PERMANENT) ||
3756 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3757 hlist_del_init_rcu(&ifa->addr_lst);
3758 goto restart;
3759 }
73a8bd74
DM		 3760 }
3761 }
3762 spin_unlock_bh(&addrconf_hash_lock);
3763 }
3764
1da177e4
LT		 3765 write_lock_bh(&idev->lock);
3766
b7b1bfce
HFS		 3767 addrconf_del_rs_timer(idev);
3768
bcdd553f 3769 /* Step 2: clear flags for stateless addrconf */
439e2385 3770 if (!how)
3c21edbd 3771 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3772
bcdd553f 3773 /* Step 3: clear tempaddr list */
372e6c8f 3774 while (!list_empty(&idev->tempaddr_list)) {
3775 ifa = list_first_entry(&idev->tempaddr_list,
3776 struct inet6_ifaddr, tmp_list);
3777 list_del(&ifa->tmp_list);
1da177e4
LT		 3778 write_unlock_bh(&idev->lock);
3779 spin_lock_bh(&ifa->lock);
3780
3781 if (ifa->ifpub) {
3782 in6_ifa_put(ifa->ifpub);
3783 ifa->ifpub = NULL;
3784 }
3785 spin_unlock_bh(&ifa->lock);
3786 in6_ifa_put(ifa);
3787 write_lock_bh(&idev->lock);
3788 }
8f37ada5 3789
f1705ec1 3790 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
8d1c802b 3791 struct fib6_info *rt = NULL;
a2d6cbb0 3792 bool keep;
38bd10c4 3793
f1705ec1 3794 addrconf_del_dad_work(ifa);
84e8b803 3795
a2d6cbb0
RV		 3796 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3797 !addr_is_local(&ifa->addr);
a2d6cbb0 3798
73a8bd74 3799 write_unlock_bh(&idev->lock);
8e8e676d 3800 spin_lock_bh(&ifa->lock);
f1705ec1 3801
a2d6cbb0 3802 if (keep) {
f1705ec1
DA		 3803 /* set state to skip the notifier below */
3804 state = INET6_IFADDR_STATE_DEAD;
6d717134 3805 ifa->state = INET6_IFADDR_STATE_PREDAD;
f1705ec1
DA		 3806 if (!(ifa->flags & IFA_F_NODAD))
3807 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3808
3809 rt = ifa->rt;
3810 ifa->rt = NULL;
f1705ec1
DA		 3811 } else {
3812 state = ifa->state;
3813 ifa->state = INET6_IFADDR_STATE_DEAD;
f1705ec1
DA		 3814 }
3815
8e8e676d 3816 spin_unlock_bh(&ifa->lock);
9d82ca98 3817
38bd10c4 3818 if (rt)
afb1d4b5 3819 ip6_del_rt(net, rt);
38bd10c4 3820
73a8bd74
DM		 3821 if (state != INET6_IFADDR_STATE_DEAD) {
3822 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3823 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
ea06f717
MM		 3824 } else {
3825 if (idev->cnf.forwarding)
3826 addrconf_leave_anycast(ifa);
3827 addrconf_leave_solict(ifa->idev, &ifa->addr);
27bdb2ab 3828 }
8f37ada5 3829
73a8bd74 3830 write_lock_bh(&idev->lock);
8ef802aa
ED		 3831 if (!keep) {
3832 list_del_rcu(&ifa->if_list);
3833 in6_ifa_put(ifa);
3834 }
73a8bd74 3835 }
8f37ada5 3836
1da177e4
LT		 3837 write_unlock_bh(&idev->lock);
3838
381f4dca
SD		 3839 /* Step 5: Discard anycast and multicast list */
3840 if (how) {
3841 ipv6_ac_destroy_dev(idev);
1da177e4 3842 ipv6_mc_destroy_dev(idev);
381f4dca 3843 } else {
1da177e4 3844 ipv6_mc_down(idev);
381f4dca 3845 }
1da177e4 3846
1da177e4 3847 idev->tstamp = jiffies;
1ab1457c 3848
bcdd553f 3849 /* Last: Shot the device (if unregistered) */
439e2385 3850 if (how) {
408c4768 3851 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3852 neigh_parms_release(&nd_tbl, idev->nd_parms);
3853 neigh_ifdown(&nd_tbl, dev);
3854 in6_dev_put(idev);
3855 }
3856 return 0;
3857}
3858
e99e88a9 3859static void addrconf_rs_timer(struct timer_list *t)
1da177e4 3860{
e99e88a9 3861 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
caf92bc4 3862 struct net_device *dev = idev->dev;
b7b1bfce 3863 struct in6_addr lladdr;
1da177e4 3864
b7b1bfce 3865 write_lock(&idev->lock);
5b2a1953 3866 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3867 goto out;
3868
9ba2add3 3869 if (!ipv6_accept_ra(idev))
5b2a1953 3870 goto out;
3871
3872 /* Announcement received after solicitation was sent */
3873 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3874 goto out;
1da177e4 3875
bd11f074 3876 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
caf92bc4
CW		 3877 write_unlock(&idev->lock);
3878 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3879 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3880 &in6addr_linklocal_allrouters);
3881 else
caf92bc4 3882 goto put;
1da177e4 3883
caf92bc4 3884 write_lock(&idev->lock);
bd11f074
MŻ		 3885 idev->rs_interval = rfc3315_s14_backoff_update(
3886 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
b7b1bfce
HFS		 3887 /* The wait after the last probe can be shorter */
3888 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3889 idev->cnf.rtr_solicits) ?
3890 idev->cnf.rtr_solicit_delay :
bd11f074 3891 idev->rs_interval);
1da177e4 3892 } else {
1da177e4
LT		 3893 /*
3894 * Note: we do not support deprecated "all on-link"
3895 * assumption any longer.
3896 */
91df42be 3897 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3898 }
3899
3900out:
b7b1bfce 3901 write_unlock(&idev->lock);
caf92bc4 3902put:
b7b1bfce 3903 in6_dev_put(idev);
1da177e4
LT		 3904}
3905
3906/*
3907 * Duplicate Address Detection
3908 */
3c21edbd
YH		 3909static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3910{
3911 unsigned long rand_num;
3912 struct inet6_dev *idev = ifp->idev;
adc176c5 3913 u64 nonce;
3c21edbd 3914
95c385b4
NH		 3915 if (ifp->flags & IFA_F_OPTIMISTIC)
3916 rand_num = 0;
3917 else
63862b5b 3918 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3919
adc176c5
EN		 3920 nonce = 0;
3921 if (idev->cnf.enhanced_dad ||
3922 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3923 do
3924 get_random_bytes(&nonce, 6);
3925 while (nonce == 0);
3926 }
3927 ifp->dad_nonce = nonce;
b7b1bfce 3928 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3929 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3930}
3931
c15b1cca 3932static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3933{
3934 struct inet6_dev *idev = ifp->idev;
3935 struct net_device *dev = idev->dev;
764d3be6 3936 bool bump_id, notify = false;
afb1d4b5 3937 struct net *net;
1da177e4
LT		 3938
3939 addrconf_join_solict(dev, &ifp->addr);
3940
63862b5b 3941 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3942
3943 read_lock_bh(&idev->lock);
622ccdf1 3944 spin_lock(&ifp->lock);
e9d3e084 3945 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3946 goto out;
1da177e4 3947
afb1d4b5 3948 net = dev_net(dev);
1da177e4 3949 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
afb1d4b5 3950 (net->ipv6.devconf_all->accept_dad < 1 &&
a2d3f3e3 3951 idev->cnf.accept_dad < 1) ||
55ebaef1
NT		 3952 !(ifp->flags&IFA_F_TENTATIVE) ||
3953 ifp->flags & IFA_F_NODAD) {
c76fe2d9
DA		 3954 bool send_na = false;
3955
3956 if (ifp->flags & IFA_F_TENTATIVE &&
3957 !(ifp->flags & IFA_F_OPTIMISTIC))
3958 send_na = true;
764d3be6 3959 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3960 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3961 spin_unlock(&ifp->lock);
1da177e4
LT		 3962 read_unlock_bh(&idev->lock);
3963
c76fe2d9 3964 addrconf_dad_completed(ifp, bump_id, send_na);
1da177e4
LT		 3965 return;
3966 }
3967
6732bade 3968 if (!(idev->if_flags & IF_READY)) {
21809faf 3969 spin_unlock(&ifp->lock);
6732bade 3970 read_unlock_bh(&idev->lock);
3c21edbd 3971 /*
590a9887 3972 * If the device is not ready:
3c21edbd
YH		 3973 * - keep it tentative if it is a permanent address.
3974 * - otherwise, kill it.
3975 */
3976 in6_ifa_hold(ifp);
cc411d0b 3977 addrconf_dad_stop(ifp, 0);
6732bade 3978 return;
3c21edbd 3979 }
95c385b4
NH		 3980
3981 /*
3982 * Optimistic nodes can start receiving
3983 * Frames right away
3984 */
7fd2561e 3985 if (ifp->flags & IFA_F_OPTIMISTIC) {
afb1d4b5
DA		 3986 ip6_ins_rt(net, ifp->rt);
3987 if (ipv6_use_optimistic_addr(net, idev)) {
7fd2561e
EK		 3988 /* Because optimistic nodes can use this address,
3989 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3990 */
16186a82 3991 notify = true;
7fd2561e
EK		 3992 }
3993 }
95c385b4 3994
6732bade 3995 addrconf_dad_kick(ifp);
1da177e4 3996out:
622ccdf1 3997 spin_unlock(&ifp->lock);
1da177e4 3998 read_unlock_bh(&idev->lock);
16186a82 3999 if (notify)
4000 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 4001}
4002
c15b1cca 4003static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 4004{
c15b1cca
HFS		 4005 bool begin_dad = false;
4006
8e8e676d 4007 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 4008 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4009 ifp->state = INET6_IFADDR_STATE_PREDAD;
4010 begin_dad = true;
4011 }
8e8e676d 4012 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 4013
4014 if (begin_dad)
4015 addrconf_mod_dad_work(ifp, 0);
4016}
4017
4018static void addrconf_dad_work(struct work_struct *w)
4019{
4020 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4021 struct inet6_ifaddr,
4022 dad_work);
1da177e4 4023 struct inet6_dev *idev = ifp->idev;
764d3be6 4024 bool bump_id, disable_ipv6 = false;
1da177e4
LT		 4025 struct in6_addr mcaddr;
4026
c15b1cca
HFS		 4027 enum {
4028 DAD_PROCESS,
4029 DAD_BEGIN,
4030 DAD_ABORT,
4031 } action = DAD_PROCESS;
4032
4033 rtnl_lock();
4034
8e8e676d 4035 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 4036 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4037 action = DAD_BEGIN;
4038 ifp->state = INET6_IFADDR_STATE_DAD;
4039 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4040 action = DAD_ABORT;
4041 ifp->state = INET6_IFADDR_STATE_POSTDAD;
85b51b12 4042
35e015e1
MC		 4043 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4044 idev->cnf.accept_dad > 1) &&
4045 !idev->cnf.disable_ipv6 &&
85b51b12
MM		 4046 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4047 struct in6_addr addr;
4048
4049 addr.s6_addr32[0] = htonl(0xfe800000);
4050 addr.s6_addr32[1] = 0;
4051
4052 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4053 ipv6_addr_equal(&ifp->addr, &addr)) {
4054 /* DAD failed for link-local based on MAC */
4055 idev->cnf.disable_ipv6 = 1;
4056
4057 pr_info("%s: IPv6 being disabled!\n",
4058 ifp->idev->dev->name);
4059 disable_ipv6 = true;
4060 }
4061 }
c15b1cca 4062 }
8e8e676d 4063 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 4064
4065 if (action == DAD_BEGIN) {
4066 addrconf_dad_begin(ifp);
4067 goto out;
4068 } else if (action == DAD_ABORT) {
751eb6b6 4069 in6_ifa_hold(ifp);
c15b1cca 4070 addrconf_dad_stop(ifp, 1);
85b51b12
MM		 4071 if (disable_ipv6)
4072 addrconf_ifdown(idev->dev, 0);
c15b1cca
HFS		 4073 goto out;
4074 }
4075
b7b1bfce 4076 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 4077 goto out;
4078
c15b1cca 4079 write_lock_bh(&idev->lock);
8ae72cbf
DA		 4080 if (idev->dead || !(idev->if_flags & IF_READY)) {
4081 write_unlock_bh(&idev->lock);
4082 goto out;
4083 }
4084
21809faf 4085 spin_lock(&ifp->lock);
622ccdf1
HX		 4086 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4087 spin_unlock(&ifp->lock);
c15b1cca 4088 write_unlock_bh(&idev->lock);
622ccdf1
HX		 4089 goto out;
4090 }
4091
b7b1bfce 4092 if (ifp->dad_probes == 0) {
c76fe2d9
DA		 4093 bool send_na = false;
4094
1da177e4
LT		 4095 /*
4096 * DAD was successful
4097 */
4098
c76fe2d9
DA		 4099 if (ifp->flags & IFA_F_TENTATIVE &&
4100 !(ifp->flags & IFA_F_OPTIMISTIC))
4101 send_na = true;
764d3be6 4102 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 4103 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 4104 spin_unlock(&ifp->lock);
c15b1cca 4105 write_unlock_bh(&idev->lock);
1da177e4 4106
c76fe2d9 4107 addrconf_dad_completed(ifp, bump_id, send_na);
1da177e4
LT		 4108
4109 goto out;
4110 }
4111
b7b1bfce 4112 ifp->dad_probes--;
c15b1cca
HFS		 4113 addrconf_mod_dad_work(ifp,
4114 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 4115 spin_unlock(&ifp->lock);
c15b1cca 4116 write_unlock_bh(&idev->lock);
1da177e4
LT		 4117
4118 /* send a neighbour solicitation for our addr */
1da177e4 4119 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
adc176c5
EN		 4120 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4121 ifp->dad_nonce);
1da177e4
LT		 4122out:
4123 in6_ifa_put(ifp);
c15b1cca 4124 rtnl_unlock();
1da177e4
LT		 4125}
4126
11ffff75
HFS		 4127/* ifp->idev must be at least read locked */
4128static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4129{
4130 struct inet6_ifaddr *ifpiter;
4131 struct inet6_dev *idev = ifp->idev;
4132
602582ca
HFS		 4133 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4134 if (ifpiter->scope > IFA_LINK)
4135 break;
11ffff75
HFS		 4136 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4137 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4138 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4139 IFA_F_PERMANENT)
4140 return false;
4141 }
4142 return true;
4143}
4144
c76fe2d9
DA		 4145static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4146 bool send_na)
1da177e4 4147{
e21e8467 4148 struct net_device *dev = ifp->idev->dev;
b7b1bfce 4149 struct in6_addr lladdr;
b173ee48 4150 bool send_rs, send_mld;
b7b1bfce 4151
c15b1cca 4152 addrconf_del_dad_work(ifp);
1da177e4
LT		 4153
4154 /*
4155 * Configure the address for reception. Now it is valid.
4156 */
4157
4158 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4159
026359bc
TA		 4160 /* If added prefix is link local and we are prepared to process
4161 router advertisements, start sending router solicitations.
1da177e4
LT		 4162 */
4163
1ec047eb 4164 read_lock_bh(&ifp->idev->lock);
11ffff75 4165 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 4166 send_rs = send_mld &&
4167 ipv6_accept_ra(ifp->idev) &&
bd11f074 4168 ifp->idev->cnf.rtr_solicits != 0 &&
b173ee48 4169 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 4170 read_unlock_bh(&ifp->idev->lock);
4171
b173ee48
HFS		 4172 /* While dad is in progress mld report's source address is in6_addrany.
4173 * Resend with proper ll now.
4174 */
4175 if (send_mld)
4176 ipv6_mc_dad_complete(ifp->idev);
4177
c76fe2d9
DA		 4178 /* send unsolicited NA if enabled */
4179 if (send_na &&
4180 (ifp->idev->cnf.ndisc_notify ||
4181 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4182 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4183 /*router=*/ !!ifp->idev->cnf.forwarding,
4184 /*solicited=*/ false, /*override=*/ true,
4185 /*inc_opt=*/ true);
4186 }
4187
1ec047eb 4188 if (send_rs) {
1da177e4
LT		 4189 /*
4190 * If a host as already performed a random delay
4191 * [...] as part of DAD [...] there is no need
4192 * to delay again before sending the first RS
4193 */
1ec047eb 4194 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 4195 return;
1ec047eb 4196 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 4197
b7b1bfce
HFS		 4198 write_lock_bh(&ifp->idev->lock);
4199 spin_lock(&ifp->lock);
bd11f074
MŻ		 4200 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4201 ifp->idev->cnf.rtr_solicit_interval);
b7b1bfce 4202 ifp->idev->rs_probes = 1;
1da177e4 4203 ifp->idev->if_flags |= IF_RS_SENT;
bd11f074 4204 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
b7b1bfce
HFS		 4205 spin_unlock(&ifp->lock);
4206 write_unlock_bh(&ifp->idev->lock);
1da177e4 4207 }
764d3be6
PA		 4208
4209 if (bump_id)
4210 rt_genid_bump_ipv6(dev_net(dev));
a11a7f71
MH		 4211
4212 /* Make sure that a new temporary address will be created
4213 * before this temporary address becomes deprecated.
4214 */
4215 if (ifp->flags & IFA_F_TEMPORARY)
4216 addrconf_verify_rtnl();
1da177e4
LT		 4217}
4218
896585d4 4219static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
e21e8467 4220{
c5e33bdd
YH		 4221 struct inet6_ifaddr *ifp;
4222
4223 read_lock_bh(&idev->lock);
502a2ffd 4224 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 4225 spin_lock(&ifp->lock);
896585d4
HL		 4226 if ((ifp->flags & IFA_F_TENTATIVE &&
4227 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4228 if (restart)
4229 ifp->state = INET6_IFADDR_STATE_PREDAD;
f2344a13 4230 addrconf_dad_kick(ifp);
896585d4 4231 }
21809faf 4232 spin_unlock(&ifp->lock);
c5e33bdd
YH		 4233 }
4234 read_unlock_bh(&idev->lock);
4235}
4236
1da177e4
LT		 4237#ifdef CONFIG_PROC_FS
4238struct if6_iter_state {
3c40090a 4239 struct seq_net_private p;
1da177e4 4240 int bucket;
1d578303 4241 int offset;
1da177e4
LT		 4242};
4243
1d578303 4244static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4 4245{
1da177e4 4246 struct if6_iter_state *state = seq->private;
1218854a 4247 struct net *net = seq_file_net(seq);
a5c1d98f 4248 struct inet6_ifaddr *ifa = NULL;
1d578303 4249 int p = 0;
1da177e4 4250
1d578303
MM		 4251 /* initial bucket if pos is 0 */
4252 if (pos == 0) {
4253 state->bucket = 0;
4254 state->offset = 0;
4255 }
4256
4257 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
a5c1d98f 4258 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
1d578303 4259 addr_lst) {
9f0d3c27
ED		 4260 if (!net_eq(dev_net(ifa->idev->dev), net))
4261 continue;
1d578303
MM		 4262 /* sync with offset */
4263 if (p < state->offset) {
4264 p++;
4265 continue;
4266 }
9f0d3c27 4267 return ifa;
1d578303
MM		 4268 }
4269
4270 /* prepare for next bucket */
4271 state->offset = 0;
4272 p = 0;
1da177e4 4273 }
c2e21293 4274 return NULL;
1da177e4
LT		 4275}
4276
c2e21293 4277static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4278 struct inet6_ifaddr *ifa)
1da177e4
LT		 4279{
4280 struct if6_iter_state *state = seq->private;
1218854a 4281 struct net *net = seq_file_net(seq);
1da177e4 4282
a5c1d98f 4283 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
9f0d3c27
ED		 4284 if (!net_eq(dev_net(ifa->idev->dev), net))
4285 continue;
1d578303 4286 state->offset++;
9f0d3c27 4287 return ifa;
1d578303 4288 }
3c40090a 4289
86f9bd1f 4290 state->offset = 0;
c2e21293 4291 while (++state->bucket < IN6_ADDR_HSIZE) {
a5c1d98f 4292 hlist_for_each_entry_rcu(ifa,
c2e21293 4293 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 4294 if (!net_eq(dev_net(ifa->idev->dev), net))
4295 continue;
9f0d3c27 4296 return ifa;
c2e21293 4297 }
1da177e4 4298 }
3c40090a 4299
c2e21293 4300 return NULL;
1da177e4
LT		 4301}
4302
1da177e4 4303static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
a5c1d98f 4304 __acquires(rcu)
1da177e4 4305{
a5c1d98f 4306 rcu_read_lock();
1d578303 4307 return if6_get_first(seq, *pos);
1da177e4
LT		 4308}
4309
4310static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4311{
4312 struct inet6_ifaddr *ifa;
4313
4314 ifa = if6_get_next(seq, v);
4315 ++*pos;
4316 return ifa;
4317}
4318
4319static void if6_seq_stop(struct seq_file *seq, void *v)
a5c1d98f 4320 __releases(rcu)
1da177e4 4321{
a5c1d98f 4322 rcu_read_unlock();
1da177e4
LT		 4323}
4324
4325static int if6_seq_show(struct seq_file *seq, void *v)
4326{
4327 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4328 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4329 &ifp->addr,
1da177e4
LT		 4330 ifp->idev->dev->ifindex,
4331 ifp->prefix_len,
4332 ifp->scope,
971a351c 4333 (u8) ifp->flags,
1da177e4
LT		 4334 ifp->idev->dev->name);
4335 return 0;
4336}
4337
56b3d975 4338static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4339 .start = if6_seq_start,
4340 .next = if6_seq_next,
4341 .show = if6_seq_show,
4342 .stop = if6_seq_stop,
4343};
4344
2c8c1e72 4345static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4346{
c3506372
CH		 4347 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4348 sizeof(struct if6_iter_state)))
1da177e4
LT		 4349 return -ENOMEM;
4350 return 0;
4351}
4352
2c8c1e72 4353static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4354{
ece31ffd 4355 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4356}
4357
4358static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4359 .init = if6_proc_net_init,
4360 .exit = if6_proc_net_exit,
3c40090a
DL		 4361};
4362
4363int __init if6_proc_init(void)
4364{
4365 return register_pernet_subsys(&if6_proc_net_ops);
4366}
4367
1da177e4
LT		 4368void if6_proc_exit(void)
4369{
3c40090a 4370 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4371}
4372#endif /* CONFIG_PROC_FS */
4373
07a93626 4374#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4375/* Check if address is a home address configured on any interface. */
b71d1d42 4376int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c 4377{
3f27fb23 4378 unsigned int hash = inet6_addr_hash(net, addr);
c2e21293 4379 struct inet6_ifaddr *ifp = NULL;
3f27fb23 4380 int ret = 0;
c2e21293 4381
4e5f47ab
ED		 4382 rcu_read_lock();
4383 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 4384 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 4385 continue;
caad295f 4386 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4387 (ifp->flags & IFA_F_HOMEADDRESS)) {
4388 ret = 1;
4389 break;
4390 }
4391 }
4e5f47ab 4392 rcu_read_unlock();
3b9f9a1c
NT		 4393 return ret;
4394}
4395#endif
4396
1da177e4
LT		 4397/*
4398 * Periodic address status verification
4399 */
4400
c15b1cca 4401static void addrconf_verify_rtnl(void)
1da177e4 4402{
b2db7564 4403 unsigned long now, next, next_sec, next_sched;
1da177e4 4404 struct inet6_ifaddr *ifp;
1da177e4
LT		 4405 int i;
4406
c15b1cca
HFS		 4407 ASSERT_RTNL();
4408
5c578aed 4409 rcu_read_lock_bh();
1da177e4 4410 now = jiffies;
b2db7564 4411 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4412
c15b1cca 4413 cancel_delayed_work(&addr_chk_work);
1da177e4 4414
bcdd553f 4415 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4416restart:
c15b1cca 4417 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 4418 unsigned long age;
1da177e4 4419
fad8da3e
YA		 4420 /* When setting preferred_lft to a value not zero or
4421 * infinity, while valid_lft is infinity
4422 * IFA_F_PERMANENT has a non-infinity life time.
4423 */
4424 if ((ifp->flags & IFA_F_PERMANENT) &&
4425 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4426 continue;
4427
4428 spin_lock(&ifp->lock);
b2db7564
YH		 4429 /* We try to batch several events at once. */
4430 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4431
8f27ebb9
YH		 4432 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4433 age >= ifp->valid_lft) {
1da177e4
LT		 4434 spin_unlock(&ifp->lock);
4435 in6_ifa_hold(ifp);
1da177e4
LT		 4436 ipv6_del_addr(ifp);
4437 goto restart;
8f27ebb9
YH		 4438 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4439 spin_unlock(&ifp->lock);
4440 continue;
1da177e4 4441 } else if (age >= ifp->prefered_lft) {
a1ed0526 4442 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4443 int deprecate = 0;
4444
4445 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4446 deprecate = 1;
4447 ifp->flags |= IFA_F_DEPRECATED;
4448 }
4449
fad8da3e
YA		 4450 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4451 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4452 next = ifp->tstamp + ifp->valid_lft * HZ;
4453
4454 spin_unlock(&ifp->lock);
4455
4456 if (deprecate) {
4457 in6_ifa_hold(ifp);
1da177e4
LT		 4458
4459 ipv6_ifa_notify(0, ifp);
4460 in6_ifa_put(ifp);
4461 goto restart;
4462 }
1da177e4
LT		 4463 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4464 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4465 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4466 ifp->idev->cnf.dad_transmits *
1f9248e5 4467 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 4468
1da177e4
LT		 4469 if (age >= ifp->prefered_lft - regen_advance) {
4470 struct inet6_ifaddr *ifpub = ifp->ifpub;
4471 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4472 next = ifp->tstamp + ifp->prefered_lft * HZ;
4473 if (!ifp->regen_count && ifpub) {
4474 ifp->regen_count++;
4475 in6_ifa_hold(ifp);
4476 in6_ifa_hold(ifpub);
4477 spin_unlock(&ifp->lock);
5c578aed 4478
291d809b
HY		 4479 spin_lock(&ifpub->lock);
4480 ifpub->regen_count = 0;
4481 spin_unlock(&ifpub->lock);
e64e469b 4482 rcu_read_unlock_bh();
fffcefe9 4483 ipv6_create_tempaddr(ifpub, ifp, true);
1da177e4
LT		 4484 in6_ifa_put(ifpub);
4485 in6_ifa_put(ifp);
e64e469b 4486 rcu_read_lock_bh();
1da177e4
LT		 4487 goto restart;
4488 }
4489 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4490 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4491 spin_unlock(&ifp->lock);
1da177e4
LT		 4492 } else {
4493 /* ifp->prefered_lft <= ifp->valid_lft */
4494 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4495 next = ifp->tstamp + ifp->prefered_lft * HZ;
4496 spin_unlock(&ifp->lock);
4497 }
4498 }
1da177e4
LT		 4499 }
4500
b2db7564
YH		 4501 next_sec = round_jiffies_up(next);
4502 next_sched = next;
4503
4504 /* If rounded timeout is accurate enough, accept it. */
4505 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4506 next_sched = next_sec;
4507
4508 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4509 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4510 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4511
e32ac250
JP		 4512 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4513 now, next, next_sec, next_sched);
c15b1cca 4514 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4515 rcu_read_unlock_bh();
1da177e4
LT		 4516}
4517
c15b1cca
HFS		 4518static void addrconf_verify_work(struct work_struct *w)
4519{
4520 rtnl_lock();
4521 addrconf_verify_rtnl();
4522 rtnl_unlock();
4523}
4524
4525static void addrconf_verify(void)
4526{
4527 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4528}
4529
caeaba79
ND		 4530static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4531 struct in6_addr **peer_pfx)
461d8837
TG		 4532{
4533 struct in6_addr *pfx = NULL;
4534
caeaba79
ND		 4535 *peer_pfx = NULL;
4536
461d8837
TG		 4537 if (addr)
4538 pfx = nla_data(addr);
4539
4540 if (local) {
4541 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4542 *peer_pfx = pfx;
4543 pfx = nla_data(local);
461d8837
TG		 4544 }
4545
4546 return pfx;
4547}
4548
ef7c79ed 4549static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4550 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4551 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4552 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4553 [IFA_FLAGS] = { .len = sizeof(u32) },
8308f3ff 4554 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
6ecf4c37 4555 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
461d8837
TG		 4556};
4557
1da177e4 4558static int
c21ef3e3
DA		 4559inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4560 struct netlink_ext_ack *extack)
1da177e4 4561{
3b1e0a65 4562 struct net *net = sock_net(skb->sk);
b933f716
TG		 4563 struct ifaddrmsg *ifm;
4564 struct nlattr *tb[IFA_MAX+1];
caeaba79 4565 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4566 u32 ifa_flags;
b933f716 4567 int err;
1da177e4 4568
8cb08174
JB		 4569 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4570 ifa_ipv6_policy, extack);
b933f716
TG		 4571 if (err < 0)
4572 return err;
4573
4574 ifm = nlmsg_data(nlh);
caeaba79 4575 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4576 if (!pfx)
1da177e4
LT		 4577 return -EINVAL;
4578
6046d5b4
HK		 4579 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4580
4581 /* We ignore other flags so far. */
4582 ifa_flags &= IFA_F_MANAGETEMPADDR;
4583
4584 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4585 ifm->ifa_prefixlen);
1da177e4
LT		 4586}
4587
8308f3ff
DA		 4588static int modify_prefix_route(struct inet6_ifaddr *ifp,
4589 unsigned long expires, u32 flags)
4590{
4591 struct fib6_info *f6i;
e7c7faa9 4592 u32 prio;
8308f3ff 4593
2b2450ca
DA		 4594 f6i = addrconf_get_prefix_route(&ifp->addr, ifp->prefix_len,
4595 ifp->idev->dev, 0, RTF_DEFAULT, true);
8308f3ff
DA		 4596 if (!f6i)
4597 return -ENOENT;
4598
e7c7faa9
DA		 4599 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4600 if (f6i->fib6_metric != prio) {
4601 /* delete old one */
4602 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
4603
8308f3ff
DA		 4604 /* add new one */
4605 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4606 ifp->rt_priority, ifp->idev->dev,
4607 expires, flags, GFP_KERNEL);
8308f3ff
DA		 4608 } else {
4609 if (!expires)
4610 fib6_clean_expires(f6i);
4611 else
4612 fib6_set_expires(f6i, expires);
4613
4614 fib6_info_release(f6i);
4615 }
4616
4617 return 0;
4618}
4619
d169a1f8 4620static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
081bba5b 4621{
6f704992
YH		 4622 u32 flags;
4623 clock_t expires;
4bed72e4 4624 unsigned long timeout;
53bd6749 4625 bool was_managetempaddr;
5b84efec 4626 bool had_prefixroute;
46d48046 4627
c15b1cca
HFS		 4628 ASSERT_RTNL();
4629
d169a1f8 4630 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
081bba5b
NT		 4631 return -EINVAL;
4632
d169a1f8 4633 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
53bd6749
JP		 4634 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4635 return -EINVAL;
4636
f1c02cfb 4637 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
d169a1f8 4638 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
f1c02cfb 4639
d169a1f8 4640 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4bed72e4
YH		 4641 if (addrconf_finite_timeout(timeout)) {
4642 expires = jiffies_to_clock_t(timeout * HZ);
d169a1f8 4643 cfg->valid_lft = timeout;
6f704992 4644 flags = RTF_EXPIRES;
4bed72e4
YH		 4645 } else {
4646 expires = 0;
4647 flags = 0;
d169a1f8 4648 cfg->ifa_flags |= IFA_F_PERMANENT;
6f704992 4649 }
081bba5b 4650
d169a1f8 4651 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4bed72e4
YH		 4652 if (addrconf_finite_timeout(timeout)) {
4653 if (timeout == 0)
d169a1f8
DA		 4654 cfg->ifa_flags |= IFA_F_DEPRECATED;
4655 cfg->preferred_lft = timeout;
4bed72e4 4656 }
081bba5b
NT		 4657
4658 spin_lock_bh(&ifp->lock);
53bd6749 4659 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4660 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4661 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4662 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4663 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4664 IFA_F_NOPREFIXROUTE);
d169a1f8 4665 ifp->flags |= cfg->ifa_flags;
081bba5b 4666 ifp->tstamp = jiffies;
d169a1f8
DA		 4667 ifp->valid_lft = cfg->valid_lft;
4668 ifp->prefered_lft = cfg->preferred_lft;
081bba5b 4669
8308f3ff
DA		 4670 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4671 ifp->rt_priority = cfg->rt_priority;
081bba5b
NT		 4672
4673 spin_unlock_bh(&ifp->lock);
4674 if (!(ifp->flags&IFA_F_TENTATIVE))
4675 ipv6_ifa_notify(0, ifp);
081bba5b 4676
d169a1f8 4677 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
8308f3ff
DA		 4678 int rc = -ENOENT;
4679
4680 if (had_prefixroute)
4681 rc = modify_prefix_route(ifp, expires, flags);
4682
4683 /* prefix route could have been deleted; if so restore it */
4684 if (rc == -ENOENT) {
4685 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4686 ifp->rt_priority, ifp->idev->dev,
4687 expires, flags, GFP_KERNEL);
4688 }
5b84efec
TH		 4689 } else if (had_prefixroute) {
4690 enum cleanup_prefix_rt_t action;
4691 unsigned long rt_expires;
4692
4693 write_lock_bh(&ifp->idev->lock);
4694 action = check_cleanup_prefix_route(ifp, &rt_expires);
4695 write_unlock_bh(&ifp->idev->lock);
4696
4697 if (action != CLEANUP_PREFIX_RT_NOP) {
4698 cleanup_prefix_route(ifp, rt_expires,
4699 action == CLEANUP_PREFIX_RT_DEL);
4700 }
761aac73 4701 }
53bd6749
JP		 4702
4703 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
d169a1f8
DA		 4704 if (was_managetempaddr &&
4705 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4706 cfg->valid_lft = 0;
4707 cfg->preferred_lft = 0;
4708 }
4709 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4710 cfg->preferred_lft, !was_managetempaddr,
4711 jiffies);
53bd6749
JP		 4712 }
4713
c15b1cca 4714 addrconf_verify_rtnl();
081bba5b
NT		 4715
4716 return 0;
4717}
4718
1da177e4 4719static int
c21ef3e3
DA		 4720inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4721 struct netlink_ext_ack *extack)
1da177e4 4722{
3b1e0a65 4723 struct net *net = sock_net(skb->sk);
461d8837
TG		 4724 struct ifaddrmsg *ifm;
4725 struct nlattr *tb[IFA_MAX+1];
19b1518c 4726 struct in6_addr *peer_pfx;
7198f8ce
TG		 4727 struct inet6_ifaddr *ifa;
4728 struct net_device *dev;
f1c02cfb 4729 struct inet6_dev *idev;
19b1518c 4730 struct ifa6_config cfg;
461d8837 4731 int err;
1da177e4 4732
8cb08174
JB		 4733 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4734 ifa_ipv6_policy, extack);
461d8837
TG		 4735 if (err < 0)
4736 return err;
4737
19b1518c
DA		 4738 memset(&cfg, 0, sizeof(cfg));
4739
461d8837 4740 ifm = nlmsg_data(nlh);
19b1518c
DA		 4741 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4742 if (!cfg.pfx)
1da177e4
LT		 4743 return -EINVAL;
4744
19b1518c
DA		 4745 cfg.peer_pfx = peer_pfx;
4746 cfg.plen = ifm->ifa_prefixlen;
8308f3ff
DA		 4747 if (tb[IFA_RT_PRIORITY])
4748 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4749
19b1518c
DA		 4750 cfg.valid_lft = INFINITY_LIFE_TIME;
4751 cfg.preferred_lft = INFINITY_LIFE_TIME;
4752
461d8837 4753 if (tb[IFA_CACHEINFO]) {
0778769d 4754 struct ifa_cacheinfo *ci;
461d8837
TG		 4755
4756 ci = nla_data(tb[IFA_CACHEINFO]);
19b1518c
DA		 4757 cfg.valid_lft = ci->ifa_valid;
4758 cfg.preferred_lft = ci->ifa_prefered;
0778769d
NT		 4759 }
4760
af284937 4761 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4762 if (!dev)
7198f8ce
TG		 4763 return -ENODEV;
4764
19b1518c
DA		 4765 if (tb[IFA_FLAGS])
4766 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4767 else
4768 cfg.ifa_flags = ifm->ifa_flags;
479840ff 4769
55ebaef1 4770 /* We ignore other flags so far. */
19b1518c
DA		 4771 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4772 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4773 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
f1c02cfb
SD		 4774
4775 idev = ipv6_find_idev(dev);
db0b99f5
SD		 4776 if (IS_ERR(idev))
4777 return PTR_ERR(idev);
f1c02cfb
SD		 4778
4779 if (!ipv6_allow_optimistic_dad(net, idev))
19b1518c 4780 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
f1c02cfb 4781
19b1518c
DA		 4782 if (cfg.ifa_flags & IFA_F_NODAD &&
4783 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
f1c02cfb
SD		 4784 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4785 return -EINVAL;
4786 }
55ebaef1 4787
19b1518c 4788 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
63159f29 4789 if (!ifa) {
7198f8ce
TG		 4790 /*
4791 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4792 * userspace already relies on not having to provide this.
7198f8ce 4793 */
19b1518c 4794 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
081bba5b
NT		 4795 }
4796
7198f8ce
TG		 4797 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4798 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4799 err = -EEXIST;
4800 else
d169a1f8 4801 err = inet6_addr_modify(ifa, &cfg);
7198f8ce
TG		 4802
4803 in6_ifa_put(ifa);
4804
4805 return err;
1da177e4
LT		 4806}
4807
479840ff 4808static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4809 u8 scope, int ifindex)
4810{
4811 struct ifaddrmsg *ifm;
4812
4813 ifm = nlmsg_data(nlh);
4814 ifm->ifa_family = AF_INET6;
4815 ifm->ifa_prefixlen = prefixlen;
4816 ifm->ifa_flags = flags;
4817 ifm->ifa_scope = scope;
4818 ifm->ifa_index = ifindex;
4819}
4820
85486af0
TG		 4821static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4822 unsigned long tstamp, u32 preferred, u32 valid)
4823{
4824 struct ifa_cacheinfo ci;
4825
18a31e1e
TG		 4826 ci.cstamp = cstamp_delta(cstamp);
4827 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4828 ci.ifa_prefered = preferred;
4829 ci.ifa_valid = valid;
4830
4831 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4832}
4833
101bb229
TG		 4834static inline int rt_scope(int ifa_scope)
4835{
4836 if (ifa_scope & IFA_HOST)
4837 return RT_SCOPE_HOST;
4838 else if (ifa_scope & IFA_LINK)
4839 return RT_SCOPE_LINK;
4840 else if (ifa_scope & IFA_SITE)
4841 return RT_SCOPE_SITE;
4842 else
4843 return RT_SCOPE_UNIVERSE;
4844}
4845
0ab6803b
TG		 4846static inline int inet6_ifaddr_msgsize(void)
4847{
339bf98f 4848 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4849 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4850 + nla_total_size(16) /* IFA_ADDRESS */
479840ff 4851 + nla_total_size(sizeof(struct ifa_cacheinfo))
8308f3ff
DA		 4852 + nla_total_size(4) /* IFA_FLAGS */
4853 + nla_total_size(4) /* IFA_RT_PRIORITY */;
0ab6803b 4854}
c5396a31 4855
6ba1e6e8
DA		 4856enum addr_type_t {
4857 UNICAST_ADDR,
4858 MULTICAST_ADDR,
4859 ANYCAST_ADDR,
4860};
4861
203651b6
CB		 4862struct inet6_fill_args {
4863 u32 portid;
4864 u32 seq;
4865 int event;
4866 unsigned int flags;
4867 int netnsid;
6371a71f 4868 int ifindex;
6ba1e6e8 4869 enum addr_type_t type;
203651b6
CB		 4870};
4871
1da177e4 4872static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
203651b6 4873 struct inet6_fill_args *args)
1da177e4 4874{
1da177e4 4875 struct nlmsghdr *nlh;
85486af0 4876 u32 preferred, valid;
1da177e4 4877
203651b6
CB		 4878 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4879 sizeof(struct ifaddrmsg), args->flags);
63159f29 4880 if (!nlh)
26932566 4881 return -EMSGSIZE;
0ab6803b 4882
101bb229
TG		 4883 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4884 ifa->idev->dev->ifindex);
4885
203651b6
CB		 4886 if (args->netnsid >= 0 &&
4887 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
6ecf4c37
CB		 4888 goto error;
4889
fad8da3e
YA		 4890 if (!((ifa->flags&IFA_F_PERMANENT) &&
4891 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4892 preferred = ifa->prefered_lft;
4893 valid = ifa->valid_lft;
4894 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4895 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4896 if (preferred > tval)
4897 preferred -= tval;
4898 else
4899 preferred = 0;
f56619fc
BH		 4900 if (valid != INFINITY_LIFE_TIME) {
4901 if (valid > tval)
4902 valid -= tval;
4903 else
4904 valid = 0;
4905 }
1da177e4
LT		 4906 }
4907 } else {
85486af0
TG		 4908 preferred = INFINITY_LIFE_TIME;
4909 valid = INFINITY_LIFE_TIME;
4910 }
4911
7996c799 4912 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4913 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4914 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4915 goto error;
4916 } else
930345ea 4917 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4918 goto error;
4919
8308f3ff
DA		 4920 if (ifa->rt_priority &&
4921 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
4922 goto error;
4923
caeaba79
ND		 4924 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4925 goto error;
1da177e4 4926
479840ff
JP		 4927 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4928 goto error;
4929
053c095a
JB		 4930 nlmsg_end(skb, nlh);
4931 return 0;
caeaba79
ND		 4932
4933error:
4934 nlmsg_cancel(skb, nlh);
4935 return -EMSGSIZE;
1da177e4
LT		 4936}
4937
4938static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
203651b6 4939 struct inet6_fill_args *args)
1da177e4 4940{
1da177e4 4941 struct nlmsghdr *nlh;
101bb229
TG		 4942 u8 scope = RT_SCOPE_UNIVERSE;
4943 int ifindex = ifmca->idev->dev->ifindex;
4944
4945 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4946 scope = RT_SCOPE_SITE;
1da177e4 4947
203651b6
CB		 4948 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4949 sizeof(struct ifaddrmsg), args->flags);
63159f29 4950 if (!nlh)
26932566 4951 return -EMSGSIZE;
85486af0 4952
203651b6
CB		 4953 if (args->netnsid >= 0 &&
4954 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
6ecf4c37
CB		 4955 return -EMSGSIZE;
4956
0ab6803b 4957 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4958 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4959 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4960 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4961 nlmsg_cancel(skb, nlh);
4962 return -EMSGSIZE;
4963 }
85486af0 4964
053c095a
JB		 4965 nlmsg_end(skb, nlh);
4966 return 0;
1da177e4
LT		 4967}
4968
4969static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
203651b6 4970 struct inet6_fill_args *args)
1da177e4 4971{
9ee8cbb2
DA		 4972 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
4973 int ifindex = dev ? dev->ifindex : 1;
1da177e4 4974 struct nlmsghdr *nlh;
101bb229 4975 u8 scope = RT_SCOPE_UNIVERSE;
101bb229
TG		 4976
4977 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4978 scope = RT_SCOPE_SITE;
1da177e4 4979
203651b6
CB		 4980 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4981 sizeof(struct ifaddrmsg), args->flags);
63159f29 4982 if (!nlh)
26932566 4983 return -EMSGSIZE;
85486af0 4984
203651b6
CB		 4985 if (args->netnsid >= 0 &&
4986 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
6ecf4c37
CB		 4987 return -EMSGSIZE;
4988
0ab6803b 4989 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4990 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4991 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4992 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4993 nlmsg_cancel(skb, nlh);
4994 return -EMSGSIZE;
4995 }
1da177e4 4996
053c095a
JB		 4997 nlmsg_end(skb, nlh);
4998 return 0;
1da177e4
LT		 4999}
5000
234b27c3
ED		 5001/* called with rcu_read_lock() */
5002static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
fe884c2b 5003 struct netlink_callback *cb, int s_ip_idx,
6ba1e6e8 5004 struct inet6_fill_args *fillargs)
234b27c3 5005{
234b27c3
ED		 5006 struct ifmcaddr6 *ifmca;
5007 struct ifacaddr6 *ifaca;
fe884c2b 5008 int ip_idx = 0;
234b27c3 5009 int err = 1;
234b27c3
ED		 5010
5011 read_lock_bh(&idev->lock);
6ba1e6e8 5012 switch (fillargs->type) {
502a2ffd 5013 case UNICAST_ADDR: {
5014 struct inet6_ifaddr *ifa;
6ba1e6e8 5015 fillargs->event = RTM_NEWADDR;
502a2ffd 5016
234b27c3 5017 /* unicast address incl. temp addr */
502a2ffd 5018 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4ba4c566
DA		 5019 if (ip_idx < s_ip_idx)
5020 goto next;
6ba1e6e8 5021 err = inet6_fill_ifaddr(skb, ifa, fillargs);
053c095a 5022 if (err < 0)
234b27c3 5023 break;
63998ac2 5024 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4ba4c566
DA		 5025next:
5026 ip_idx++;
234b27c3
ED		 5027 }
5028 break;
502a2ffd 5029 }
234b27c3 5030 case MULTICAST_ADDR:
6ba1e6e8 5031 fillargs->event = RTM_GETMULTICAST;
203651b6 5032
234b27c3
ED		 5033 /* multicast address */
5034 for (ifmca = idev->mc_list; ifmca;
5035 ifmca = ifmca->next, ip_idx++) {
5036 if (ip_idx < s_ip_idx)
5037 continue;
6ba1e6e8 5038 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
053c095a 5039 if (err < 0)
234b27c3
ED		 5040 break;
5041 }
5042 break;
5043 case ANYCAST_ADDR:
6ba1e6e8 5044 fillargs->event = RTM_GETANYCAST;
234b27c3
ED		 5045 /* anycast address */
5046 for (ifaca = idev->ac_list; ifaca;
5047 ifaca = ifaca->aca_next, ip_idx++) {
5048 if (ip_idx < s_ip_idx)
5049 continue;
6ba1e6e8 5050 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
053c095a 5051 if (err < 0)
234b27c3
ED		 5052 break;
5053 }
5054 break;
5055 default:
5056 break;
5057 }
5058 read_unlock_bh(&idev->lock);
fe884c2b 5059 cb->args[2] = ip_idx;
234b27c3
ED		 5060 return err;
5061}
5062
ed6eff11
DA		 5063static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5064 struct inet6_fill_args *fillargs,
5065 struct net **tgt_net, struct sock *sk,
6371a71f 5066 struct netlink_callback *cb)
ed6eff11 5067{
6371a71f 5068 struct netlink_ext_ack *extack = cb->extack;
ed6eff11
DA		 5069 struct nlattr *tb[IFA_MAX+1];
5070 struct ifaddrmsg *ifm;
5071 int err, i;
5072
5073 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5074 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5075 return -EINVAL;
5076 }
5077
5078 ifm = nlmsg_data(nlh);
5079 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5080 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5081 return -EINVAL;
5082 }
6371a71f
DA		 5083
5084 fillargs->ifindex = ifm->ifa_index;
5085 if (fillargs->ifindex) {
5086 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5087 fillargs->flags |= NLM_F_DUMP_FILTERED;
ed6eff11
DA		 5088 }
5089
8cb08174
JB		 5090 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5091 ifa_ipv6_policy, extack);
ed6eff11
DA		 5092 if (err < 0)
5093 return err;
5094
5095 for (i = 0; i <= IFA_MAX; ++i) {
5096 if (!tb[i])
5097 continue;
5098
5099 if (i == IFA_TARGET_NETNSID) {
5100 struct net *net;
5101
5102 fillargs->netnsid = nla_get_s32(tb[i]);
5103 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5104 if (IS_ERR(net)) {
bf4cc40e 5105 fillargs->netnsid = -1;
ed6eff11
DA		 5106 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5107 return PTR_ERR(net);
5108 }
5109 *tgt_net = net;
5110 } else {
5111 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5112 return -EINVAL;
5113 }
5114 }
5115
5116 return 0;
5117}
5118
1da177e4
LT		 5119static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5120 enum addr_type_t type)
5121{
ed6eff11 5122 const struct nlmsghdr *nlh = cb->nlh;
6ba1e6e8
DA		 5123 struct inet6_fill_args fillargs = {
5124 .portid = NETLINK_CB(cb->skb).portid,
5125 .seq = cb->nlh->nlmsg_seq,
5126 .flags = NLM_F_MULTI,
5127 .netnsid = -1,
5128 .type = type,
5129 };
234b27c3 5130 struct net *net = sock_net(skb->sk);
6ecf4c37 5131 struct net *tgt_net = net;
fe884c2b 5132 int idx, s_idx, s_ip_idx;
234b27c3 5133 int h, s_h;
1da177e4 5134 struct net_device *dev;
234b27c3
ED		 5135 struct inet6_dev *idev;
5136 struct hlist_head *head;
242afaa6 5137 int err = 0;
1ab1457c 5138
234b27c3
ED		 5139 s_h = cb->args[0];
5140 s_idx = idx = cb->args[1];
fe884c2b 5141 s_ip_idx = cb->args[2];
5d5619b4 5142
ed6eff11 5143 if (cb->strict_check) {
ed6eff11 5144 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
6371a71f 5145 skb->sk, cb);
ed6eff11 5146 if (err < 0)
242afaa6 5147 goto put_tgt_net;
6371a71f 5148
242afaa6 5149 err = 0;
6371a71f
DA		 5150 if (fillargs.ifindex) {
5151 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
242afaa6
DA		 5152 if (!dev) {
5153 err = -ENODEV;
5154 goto put_tgt_net;
5155 }
6371a71f
DA		 5156 idev = __in6_dev_get(dev);
5157 if (idev) {
5158 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5159 &fillargs);
1518039f
JK		 5160 if (err > 0)
5161 err = 0;
6371a71f
DA		 5162 }
5163 goto put_tgt_net;
5164 }
6ecf4c37
CB		 5165 }
5166
234b27c3 5167 rcu_read_lock();
6ecf4c37 5168 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
234b27c3
ED		 5169 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5170 idx = 0;
6ecf4c37 5171 head = &tgt_net->dev_index_head[h];
b67bfe0d 5172 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 5173 if (idx < s_idx)
5174 goto cont;
4b97efdf 5175 if (h > s_h || idx > s_idx)
234b27c3 5176 s_ip_idx = 0;
e21e8467
SH		 5177 idev = __in6_dev_get(dev);
5178 if (!idev)
234b27c3
ED		 5179 goto cont;
5180
fe884c2b 5181 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
6ba1e6e8 5182 &fillargs) < 0)
234b27c3 5183 goto done;
7562f876 5184cont:
234b27c3
ED		 5185 idx++;
5186 }
1da177e4 5187 }
234b27c3
ED		 5188done:
5189 rcu_read_unlock();
5190 cb->args[0] = h;
5191 cb->args[1] = idx;
6371a71f 5192put_tgt_net:
6ba1e6e8 5193 if (fillargs.netnsid >= 0)
6ecf4c37 5194 put_net(tgt_net);
234b27c3 5195
7c1e8a38 5196 return skb->len ? : err;
1da177e4
LT		 5197}
5198
5199static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5200{
5201 enum addr_type_t type = UNICAST_ADDR;
b854272b 5202
1da177e4
LT		 5203 return inet6_dump_addr(skb, cb, type);
5204}
5205
5206static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5207{
5208 enum addr_type_t type = MULTICAST_ADDR;
b854272b 5209
1da177e4
LT		 5210 return inet6_dump_addr(skb, cb, type);
5211}
5212
5213
5214static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5215{
5216 enum addr_type_t type = ANYCAST_ADDR;
b854272b 5217
1da177e4
LT		 5218 return inet6_dump_addr(skb, cb, type);
5219}
5220
4b1373de
JK		 5221static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5222 const struct nlmsghdr *nlh,
5223 struct nlattr **tb,
5224 struct netlink_ext_ack *extack)
5225{
5226 struct ifaddrmsg *ifm;
5227 int i, err;
5228
5229 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5230 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5231 return -EINVAL;
5232 }
5233
5234 ifm = nlmsg_data(nlh);
5235 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5236 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5237 return -EINVAL;
5238 }
5239
5240 if (!netlink_strict_get_check(skb))
8cb08174
JB		 5241 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5242 ifa_ipv6_policy, extack);
4b1373de 5243
8cb08174
JB		 5244 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5245 ifa_ipv6_policy, extack);
4b1373de
JK		 5246 if (err)
5247 return err;
5248
5249 for (i = 0; i <= IFA_MAX; i++) {
5250 if (!tb[i])
5251 continue;
5252
5253 switch (i) {
5254 case IFA_TARGET_NETNSID:
5255 case IFA_ADDRESS:
5256 case IFA_LOCAL:
5257 break;
5258 default:
5259 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5260 return -EINVAL;
5261 }
5262 }
5263
5264 return 0;
5265}
5266
c21ef3e3
DA		 5267static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5268 struct netlink_ext_ack *extack)
6c223828 5269{
3b1e0a65 5270 struct net *net = sock_net(in_skb->sk);
203651b6
CB		 5271 struct inet6_fill_args fillargs = {
5272 .portid = NETLINK_CB(in_skb).portid,
5273 .seq = nlh->nlmsg_seq,
5274 .event = RTM_NEWADDR,
5275 .flags = 0,
5276 .netnsid = -1,
5277 };
6ecf4c37 5278 struct net *tgt_net = net;
1b29fc2c
TG		 5279 struct ifaddrmsg *ifm;
5280 struct nlattr *tb[IFA_MAX+1];
caeaba79 5281 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 5282 struct net_device *dev = NULL;
5283 struct inet6_ifaddr *ifa;
5284 struct sk_buff *skb;
6c223828
NT		 5285 int err;
5286
4b1373de 5287 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
1b29fc2c 5288 if (err < 0)
c24675f8 5289 return err;
1b29fc2c 5290
6ecf4c37 5291 if (tb[IFA_TARGET_NETNSID]) {
203651b6 5292 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
6ecf4c37
CB		 5293
5294 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
203651b6 5295 fillargs.netnsid);
6ecf4c37
CB		 5296 if (IS_ERR(tgt_net))
5297 return PTR_ERR(tgt_net);
5298 }
5299
caeaba79 5300 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
c24675f8
FW		 5301 if (!addr)
5302 return -EINVAL;
6c223828 5303
1b29fc2c 5304 ifm = nlmsg_data(nlh);
6c223828 5305 if (ifm->ifa_index)
6ecf4c37 5306 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
6c223828 5307
6ecf4c37 5308 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
e21e8467 5309 if (!ifa) {
1b29fc2c
TG		 5310 err = -EADDRNOTAVAIL;
5311 goto errout;
5312 }
6c223828 5313
e21e8467
SH		 5314 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5315 if (!skb) {
6c223828 5316 err = -ENOBUFS;
1b29fc2c 5317 goto errout_ifa;
6c223828
NT		 5318 }
5319
203651b6 5320 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
26932566
PM		 5321 if (err < 0) {
5322 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5323 WARN_ON(err == -EMSGSIZE);
5324 kfree_skb(skb);
5325 goto errout_ifa;
5326 }
6ecf4c37 5327 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
1b29fc2c 5328errout_ifa:
6c223828 5329 in6_ifa_put(ifa);
1b29fc2c 5330errout:
c24675f8
FW		 5331 if (dev)
5332 dev_put(dev);
203651b6 5333 if (fillargs.netnsid >= 0)
6ecf4c37
CB		 5334 put_net(tgt_net);
5335
6c223828 5336 return err;
6c223828
NT		 5337}
5338
1da177e4
LT		 5339static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5340{
5341 struct sk_buff *skb;
c346dca1 5342 struct net *net = dev_net(ifa->idev->dev);
203651b6
CB		 5343 struct inet6_fill_args fillargs = {
5344 .portid = 0,
5345 .seq = 0,
5346 .event = event,
5347 .flags = 0,
5348 .netnsid = -1,
5349 };
5d620266 5350 int err = -ENOBUFS;
1da177e4 5351
0ab6803b 5352 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 5353 if (!skb)
5d620266
TG		 5354 goto errout;
5355
203651b6 5356 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
26932566
PM		 5357 if (err < 0) {
5358 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5359 WARN_ON(err == -EMSGSIZE);
5360 kfree_skb(skb);
5361 goto errout;
5362 }
1ce85fe4
PNA		 5363 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5364 return;
5d620266
TG		 5365errout:
5366 if (err < 0)
6fda7350 5367 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 5368}
5369
b6f99a21 5370static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 5371 __s32 *array, int bytes)
5372{
04561c1f
TG		 5373 BUG_ON(bytes < (DEVCONF_MAX * 4));
5374
1da177e4
LT		 5375 memset(array, 0, bytes);
5376 array[DEVCONF_FORWARDING] = cnf->forwarding;
5377 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5378 array[DEVCONF_MTU6] = cnf->mtu6;
5379 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5380 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5381 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5382 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5383 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 5384 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5385 jiffies_to_msecs(cnf->rtr_solicit_interval);
bd11f074
MŻ		 5386 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5387 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
93908d19
TG		 5388 array[DEVCONF_RTR_SOLICIT_DELAY] =
5389 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 5390 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 5391 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5392 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5393 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5394 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 5395 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5396 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5397 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5398 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5399 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 5400 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 5401 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 5402 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 5403 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 5404#ifdef CONFIG_IPV6_ROUTER_PREF
5405 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 5406 array[DEVCONF_RTR_PROBE_INTERVAL] =
5407 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 5408#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 5409 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
09c884d4
YH		 5410 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5411#endif
930d6ff2 5412#endif
fbea49e1 5413 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 5414 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 5415#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5416 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 5417 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 5418#endif
7bc570c8
YH		 5419#ifdef CONFIG_IPV6_MROUTE
5420 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5421#endif
778d80be 5422 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 5423 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 5424 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 5425 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 5426 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 5427 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 5428 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 5429 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 5430 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 5431 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 5432 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 5433 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 5434 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1ababeba 5435 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
bf355b8d
DL		 5436#ifdef CONFIG_IPV6_SEG6_HMAC
5437 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5438#endif
adc176c5 5439 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
d35a00b8 5440 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
df789fe7 5441 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
2210d6b2 5442 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
1da177e4
LT		 5443}
5444
b382b191
TG		 5445static inline size_t inet6_ifla6_size(void)
5446{
5447 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5448 + nla_total_size(sizeof(struct ifla_cacheinfo))
5449 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5450 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4 5451 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
bdd72f41
SD		 5452 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5453 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5454 + 0;
b382b191
TG		 5455}
5456
339bf98f
TG		 5457static inline size_t inet6_if_nlmsg_size(void)
5458{
5459 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5460 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5461 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5462 + nla_total_size(4) /* IFLA_MTU */
5463 + nla_total_size(4) /* IFLA_LINK */
0344338b 5464 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 5465 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 5466}
c5396a31 5467
be281e55 5468static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
aca05671 5469 int bytes)
7f7d9a6b
HX		 5470{
5471 int i;
aca05671 5472 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
7f7d9a6b
HX		 5473 BUG_ON(pad < 0);
5474
5475 /* Use put_unaligned() because stats may not be aligned for u64. */
aca05671
JH		 5476 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5477 for (i = 1; i < ICMP6_MIB_MAX; i++)
be281e55 5478 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b 5479
aca05671 5480 memset(&stats[ICMP6_MIB_MAX], 0, pad);
7f7d9a6b
HX		 5481}
5482
698365fa 5483static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 5484 int bytes, size_t syncpoff)
4ce3c183 5485{
a3a77372
R		 5486 int i, c;
5487 u64 buff[IPSTATS_MIB_MAX];
5488 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5489
4ce3c183
ED		 5490 BUG_ON(pad < 0);
5491
a3a77372
R		 5492 memset(buff, 0, sizeof(buff));
5493 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 5494
a3a77372
R		 5495 for_each_possible_cpu(c) {
5496 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5497 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5498 }
5499
5500 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5501 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 5502}
5503
7f7d9a6b
HX		 5504static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5505 int bytes)
5506{
e21e8467 5507 switch (attrtype) {
7f7d9a6b 5508 case IFLA_INET6_STATS:
a3a77372
R		 5509 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5510 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 5511 break;
5512 case IFLA_INET6_ICMP6STATS:
aca05671 5513 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
7f7d9a6b
HX		 5514 break;
5515 }
5516}
5517
d5566fd7
SV		 5518static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5519 u32 ext_filter_mask)
b382b191
TG		 5520{
5521 struct nlattr *nla;
5522 struct ifla_cacheinfo ci;
5523
c78679e8
DM		 5524 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5525 goto nla_put_failure;
b382b191 5526 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 5527 ci.tstamp = cstamp_delta(idev->tstamp);
5528 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 5529 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 5530 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5531 goto nla_put_failure;
b382b191 5532 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 5533 if (!nla)
b382b191
TG		 5534 goto nla_put_failure;
5535 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5536
5537 /* XXX - MC not implemented */
5538
d5566fd7
SV		 5539 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5540 return 0;
5541
b382b191 5542 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 5543 if (!nla)
b382b191
TG		 5544 goto nla_put_failure;
5545 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5546
5547 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 5548 if (!nla)
b382b191
TG		 5549 goto nla_put_failure;
5550 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5551
f53adae4 5552 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 5553 if (!nla)
f53adae4 5554 goto nla_put_failure;
bc91b0f0 5555
d35a00b8 5556 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
bc91b0f0
JP		 5557 goto nla_put_failure;
5558
f53adae4
DB		 5559 read_lock_bh(&idev->lock);
5560 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5561 read_unlock_bh(&idev->lock);
5562
b382b191
TG		 5563 return 0;
5564
5565nla_put_failure:
5566 return -EMSGSIZE;
5567}
5568
b1974ed0
AR		 5569static size_t inet6_get_link_af_size(const struct net_device *dev,
5570 u32 ext_filter_mask)
b382b191
TG		 5571{
5572 if (!__in6_dev_get(dev))
5573 return 0;
5574
5575 return inet6_ifla6_size();
5576}
5577
d5566fd7
SV		 5578static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5579 u32 ext_filter_mask)
b382b191
TG		 5580{
5581 struct inet6_dev *idev = __in6_dev_get(dev);
5582
5583 if (!idev)
5584 return -ENODATA;
5585
d5566fd7 5586 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5587 return -EMSGSIZE;
5588
5589 return 0;
5590}
5591
f53adae4
DB		 5592static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5593{
f53adae4
DB		 5594 struct inet6_ifaddr *ifp;
5595 struct net_device *dev = idev->dev;
47e27d5e 5596 bool clear_token, update_rs = false;
dc848292 5597 struct in6_addr ll_addr;
f53adae4 5598
c15b1cca
HFS		 5599 ASSERT_RTNL();
5600
63159f29 5601 if (!token)
f53adae4 5602 return -EINVAL;
f53adae4
DB		 5603 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5604 return -EINVAL;
f53adae4
DB		 5605 if (!ipv6_accept_ra(idev))
5606 return -EINVAL;
bd11f074 5607 if (idev->cnf.rtr_solicits == 0)
f53adae4
DB		 5608 return -EINVAL;
5609
5610 write_lock_bh(&idev->lock);
5611
5612 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5613 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5614
5615 write_unlock_bh(&idev->lock);
5616
47e27d5e
DB		 5617 clear_token = ipv6_addr_any(token);
5618 if (clear_token)
5619 goto update_lft;
5620
dc848292
HFS		 5621 if (!idev->dead && (idev->if_flags & IF_READY) &&
5622 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5623 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5624 /* If we're not ready, then normal ifup will take care
5625 * of this. Otherwise, we need to request our rs here.
5626 */
5627 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5628 update_rs = true;
5629 }
f53adae4 5630
47e27d5e 5631update_lft:
f53adae4 5632 write_lock_bh(&idev->lock);
fc403832 5633
77ecaace 5634 if (update_rs) {
fc403832 5635 idev->if_flags |= IF_RS_SENT;
bd11f074
MŻ		 5636 idev->rs_interval = rfc3315_s14_backoff_init(
5637 idev->cnf.rtr_solicit_interval);
77ecaace 5638 idev->rs_probes = 1;
bd11f074 5639 addrconf_mod_rs_timer(idev, idev->rs_interval);
77ecaace 5640 }
f53adae4
DB		 5641
5642 /* Well, that's kinda nasty ... */
5643 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5644 spin_lock(&ifp->lock);
617fe29d 5645 if (ifp->tokenized) {
f53adae4
DB		 5646 ifp->valid_lft = 0;
5647 ifp->prefered_lft = 0;
5648 }
5649 spin_unlock(&ifp->lock);
5650 }
5651
5652 write_unlock_bh(&idev->lock);
b2ed64a9 5653 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 5654 addrconf_verify_rtnl();
f53adae4
DB		 5655 return 0;
5656}
5657
11b1f828
DB		 5658static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5659 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5660 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5661};
5662
d35a00b8
FJ		 5663static int check_addr_gen_mode(int mode)
5664{
5665 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5666 mode != IN6_ADDR_GEN_MODE_NONE &&
5667 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5668 mode != IN6_ADDR_GEN_MODE_RANDOM)
5669 return -EINVAL;
5670 return 1;
5671}
5672
5673static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5674 int mode)
5675{
5676 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5677 !idev->cnf.stable_secret.initialized &&
5678 !net->ipv6.devconf_dflt->stable_secret.initialized)
5679 return -EINVAL;
5680 return 1;
5681}
5682
7dc2bcca
MM		 5683static int inet6_validate_link_af(const struct net_device *dev,
5684 const struct nlattr *nla)
5685{
5686 struct nlattr *tb[IFLA_INET6_MAX + 1];
5687 struct inet6_dev *idev = NULL;
5688 int err;
5689
5690 if (dev) {
5691 idev = __in6_dev_get(dev);
5692 if (!idev)
5693 return -EAFNOSUPPORT;
5694 }
5695
5696 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5697 inet6_af_policy, NULL);
5698 if (err)
5699 return err;
5700
5701 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5702 return -EINVAL;
5703
5704 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5705 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5706
5707 if (check_addr_gen_mode(mode) < 0)
5708 return -EINVAL;
5709 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5710 return -EINVAL;
5711 }
5712
5713 return 0;
5714}
5715
f53adae4
DB		 5716static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5717{
f53adae4
DB		 5718 struct inet6_dev *idev = __in6_dev_get(dev);
5719 struct nlattr *tb[IFLA_INET6_MAX + 1];
7dc2bcca 5720 int err;
f53adae4 5721
8cb08174 5722 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
f53adae4
DB		 5723 BUG();
5724
bc91b0f0 5725 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 5726 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 5727 if (err)
5728 return err;
5729 }
5730
5731 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5732 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5733
d35a00b8 5734 idev->cnf.addr_gen_mode = mode;
bc91b0f0 5735 }
f53adae4 5736
7dc2bcca 5737 return 0;
f53adae4
DB		 5738}
5739
1ab1457c 5740static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5741 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5742{
04561c1f 5743 struct net_device *dev = idev->dev;
04561c1f
TG		 5744 struct ifinfomsg *hdr;
5745 struct nlmsghdr *nlh;
5746 void *protoinfo;
04561c1f 5747
15e47304 5748 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5749 if (!nlh)
26932566 5750 return -EMSGSIZE;
04561c1f
TG		 5751
5752 hdr = nlmsg_data(nlh);
5753 hdr->ifi_family = AF_INET6;
5754 hdr->__ifi_pad = 0;
5755 hdr->ifi_type = dev->type;
5756 hdr->ifi_index = dev->ifindex;
5757 hdr->ifi_flags = dev_get_flags(dev);
5758 hdr->ifi_change = 0;
5759
c78679e8
DM		 5760 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5761 (dev->addr_len &&
5762 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5763 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5764 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5765 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5766 nla_put_u8(skb, IFLA_OPERSTATE,
5767 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5768 goto nla_put_failure;
ae0be8de 5769 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
63159f29 5770 if (!protoinfo)
04561c1f 5771 goto nla_put_failure;
1da177e4 5772
d5566fd7 5773 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5774 goto nla_put_failure;
1da177e4 5775
04561c1f 5776 nla_nest_end(skb, protoinfo);
053c095a
JB		 5777 nlmsg_end(skb, nlh);
5778 return 0;
1da177e4 5779
04561c1f 5780nla_put_failure:
26932566
PM		 5781 nlmsg_cancel(skb, nlh);
5782 return -EMSGSIZE;
1da177e4
LT		 5783}
5784
786e0007
DA		 5785static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5786 struct netlink_ext_ack *extack)
5787{
5788 struct ifinfomsg *ifm;
5789
5790 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5791 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5792 return -EINVAL;
5793 }
5794
5795 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5796 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5797 return -EINVAL;
5798 }
5799
5800 ifm = nlmsg_data(nlh);
5801 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5802 ifm->ifi_change || ifm->ifi_index) {
5803 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5804 return -EINVAL;
5805 }
5806
5807 return 0;
5808}
5809
1da177e4
LT		 5810static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5811{
3b1e0a65 5812 struct net *net = sock_net(skb->sk);
84d2697d 5813 int h, s_h;
434a8a58 5814 int idx = 0, s_idx;
1da177e4
LT		 5815 struct net_device *dev;
5816 struct inet6_dev *idev;
84d2697d 5817 struct hlist_head *head;
1da177e4 5818
786e0007
DA		 5819 /* only requests using strict checking can pass data to
5820 * influence the dump
5821 */
5822 if (cb->strict_check) {
5823 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
5824
5825 if (err < 0)
5826 return err;
5827 }
5828
84d2697d
ED		 5829 s_h = cb->args[0];
5830 s_idx = cb->args[1];
5831
5832 rcu_read_lock();
5833 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5834 idx = 0;
5835 head = &net->dev_index_head[h];
b67bfe0d 5836 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5837 if (idx < s_idx)
5838 goto cont;
5839 idev = __in6_dev_get(dev);
5840 if (!idev)
5841 goto cont;
5842 if (inet6_fill_ifinfo(skb, idev,
15e47304 5843 NETLINK_CB(cb->skb).portid,
84d2697d 5844 cb->nlh->nlmsg_seq,
053c095a 5845 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5846 goto out;
7562f876 5847cont:
84d2697d
ED		 5848 idx++;
5849 }
1da177e4 5850 }
84d2697d
ED		 5851out:
5852 rcu_read_unlock();
5853 cb->args[1] = idx;
5854 cb->args[0] = h;
1da177e4
LT		 5855
5856 return skb->len;
5857}
5858
5859void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5860{
5861 struct sk_buff *skb;
c346dca1 5862 struct net *net = dev_net(idev->dev);
8d7a76c9 5863 int err = -ENOBUFS;
1ab1457c 5864
339bf98f 5865 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5866 if (!skb)
8d7a76c9
TG		 5867 goto errout;
5868
5869 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5870 if (err < 0) {
5871 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5872 WARN_ON(err == -EMSGSIZE);
5873 kfree_skb(skb);
5874 goto errout;
5875 }
5f75a104 5876 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5877 return;
8d7a76c9
TG		 5878errout:
5879 if (err < 0)
5f75a104 5880 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5881}
5882
339bf98f
TG		 5883static inline size_t inet6_prefix_nlmsg_size(void)
5884{
5885 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5886 + nla_total_size(sizeof(struct in6_addr))
5887 + nla_total_size(sizeof(struct prefix_cacheinfo));
5888}
c5396a31 5889
1da177e4 5890static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5891 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5892 int event, unsigned int flags)
1da177e4 5893{
6051e2f4
TG		 5894 struct prefixmsg *pmsg;
5895 struct nlmsghdr *nlh;
1da177e4
LT		 5896 struct prefix_cacheinfo ci;
5897
15e47304 5898 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5899 if (!nlh)
26932566 5900 return -EMSGSIZE;
6051e2f4
TG		 5901
5902 pmsg = nlmsg_data(nlh);
1da177e4 5903 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5904 pmsg->prefix_pad1 = 0;
5905 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5906 pmsg->prefix_ifindex = idev->dev->ifindex;
5907 pmsg->prefix_len = pinfo->prefix_len;
5908 pmsg->prefix_type = pinfo->type;
8a47077a 5909 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5910 pmsg->prefix_flags = 0;
5911 if (pinfo->onlink)
5912 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5913 if (pinfo->autoconf)
5914 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5915
c78679e8
DM		 5916 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5917 goto nla_put_failure;
1da177e4
LT		 5918 ci.preferred_time = ntohl(pinfo->prefered);
5919 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5920 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5921 goto nla_put_failure;
053c095a
JB		 5922 nlmsg_end(skb, nlh);
5923 return 0;
1da177e4 5924
6051e2f4 5925nla_put_failure:
26932566
PM		 5926 nlmsg_cancel(skb, nlh);
5927 return -EMSGSIZE;
1da177e4
LT		 5928}
5929
1ab1457c 5930static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5931 struct prefix_info *pinfo)
5932{
5933 struct sk_buff *skb;
c346dca1 5934 struct net *net = dev_net(idev->dev);
8c384bfa 5935 int err = -ENOBUFS;
1da177e4 5936
339bf98f 5937 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5938 if (!skb)
8c384bfa
TG		 5939 goto errout;
5940
5941 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5942 if (err < 0) {
5943 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5944 WARN_ON(err == -EMSGSIZE);
5945 kfree_skb(skb);
5946 goto errout;
5947 }
1ce85fe4
PNA		 5948 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5949 return;
8c384bfa
TG		 5950errout:
5951 if (err < 0)
6fda7350 5952 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5953}
5954
1da177e4
LT		 5955static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5956{
63998ac2
ND		 5957 struct net *net = dev_net(ifp->idev->dev);
5958
c15b1cca
HFS		 5959 if (event)
5960 ASSERT_RTNL();
5961
1da177e4
LT		 5962 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5963
5964 switch (event) {
5965 case RTM_NEWADDR:
95c385b4
NH		 5966 /*
5967 * If the address was optimistic
5968 * we inserted the route at the start of
5969 * our DAD process, so we don't need
5970 * to do it again
5971 */
93c2fb25 5972 if (!rcu_access_pointer(ifp->rt->fib6_node))
afb1d4b5 5973 ip6_ins_rt(net, ifp->rt);
1da177e4
LT		 5974 if (ifp->idev->cnf.forwarding)
5975 addrconf_join_anycast(ifp);
7996c799 5976 if (!ipv6_addr_any(&ifp->peer_addr))
8308f3ff 5977 addrconf_prefix_route(&ifp->peer_addr, 128, 0,
acb54e3c 5978 ifp->idev->dev, 0, 0,
27b10608 5979 GFP_ATOMIC);
1da177e4
LT		 5980 break;
5981 case RTM_DELADDR:
5982 if (ifp->idev->cnf.forwarding)
5983 addrconf_leave_anycast(ifp);
5984 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5985 if (!ipv6_addr_any(&ifp->peer_addr)) {
8d1c802b 5986 struct fib6_info *rt;
caeaba79 5987
e7478dfc 5988 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
2b2450ca
DA		 5989 ifp->idev->dev, 0, 0,
5990 false);
8e3d5be7 5991 if (rt)
afb1d4b5 5992 ip6_del_rt(net, rt);
caeaba79 5993 }
38bd10c4 5994 if (ifp->rt) {
93531c67
DA		 5995 ip6_del_rt(net, ifp->rt);
5996 ifp->rt = NULL;
38bd10c4 5997 }
705f1c86 5998 rt_genid_bump_ipv6(net);
1da177e4
LT		 5999 break;
6000 }
63998ac2 6001 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 6002}
6003
6004static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6005{
8814c4b5 6006 rcu_read_lock_bh();
1da177e4
LT		 6007 if (likely(ifp->idev->dead == 0))
6008 __ipv6_ifa_notify(event, ifp);
8814c4b5 6009 rcu_read_unlock_bh();
1da177e4
LT		 6010}
6011
6012#ifdef CONFIG_SYSCTL
6013
6014static
fe2c6338 6015int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 6016 void __user *buffer, size_t *lenp, loff_t *ppos)
6017{
6018 int *valp = ctl->data;
6019 int val = *valp;
88af182e 6020 loff_t pos = *ppos;
fe2c6338 6021 struct ctl_table lctl;
1da177e4
LT		 6022 int ret;
6023
013d97e9
FR		 6024 /*
6025 * ctl->data points to idev->cnf.forwarding, we should
6026 * not modify it until we get the rtnl lock.
6027 */
6028 lctl = *ctl;
6029 lctl.data = &val;
6030
6031 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 6032
c8fecf22 6033 if (write)
b325fddb 6034 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 6035 if (ret)
6036 *ppos = pos;
1ab1457c 6037 return ret;
1da177e4
LT		 6038}
6039
77751427
ML		 6040static
6041int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6042 void __user *buffer, size_t *lenp, loff_t *ppos)
6043{
6044 struct inet6_dev *idev = ctl->extra1;
6045 int min_mtu = IPV6_MIN_MTU;
6046 struct ctl_table lctl;
6047
6048 lctl = *ctl;
6049 lctl.extra1 = &min_mtu;
6050 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6051
6052 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6053}
6054
56d417b1
BH		 6055static void dev_disable_change(struct inet6_dev *idev)
6056{
75538c2b
CW		 6057 struct netdev_notifier_info info;
6058
56d417b1
BH		 6059 if (!idev || !idev->dev)
6060 return;
6061
75538c2b 6062 netdev_notifier_info_init(&info, idev->dev);
56d417b1 6063 if (idev->cnf.disable_ipv6)
75538c2b 6064 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 6065 else
75538c2b 6066 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 6067}
6068
6069static void addrconf_disable_change(struct net *net, __s32 newf)
6070{
6071 struct net_device *dev;
6072 struct inet6_dev *idev;
6073
03e4deff 6074 for_each_netdev(net, dev) {
56d417b1
BH		 6075 idev = __in6_dev_get(dev);
6076 if (idev) {
6077 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6078 idev->cnf.disable_ipv6 = newf;
6079 if (changed)
6080 dev_disable_change(idev);
6081 }
56d417b1 6082 }
56d417b1
BH		 6083}
6084
013d97e9 6085static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 6086{
6087 struct net *net;
013d97e9
FR		 6088 int old;
6089
6090 if (!rtnl_trylock())
6091 return restart_syscall();
56d417b1
BH		 6092
6093 net = (struct net *)table->extra2;
013d97e9
FR		 6094 old = *p;
6095 *p = newf;
56d417b1 6096
013d97e9
FR		 6097 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6098 rtnl_unlock();
56d417b1 6099 return 0;
88af182e 6100 }
56d417b1
BH		 6101
6102 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 6103 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6104 addrconf_disable_change(net, newf);
013d97e9 6105 } else if ((!newf) ^ (!old))
56d417b1
BH		 6106 dev_disable_change((struct inet6_dev *)table->extra1);
6107
6108 rtnl_unlock();
6109 return 0;
6110}
6111
6112static
fe2c6338 6113int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 6114 void __user *buffer, size_t *lenp, loff_t *ppos)
6115{
6116 int *valp = ctl->data;
6117 int val = *valp;
88af182e 6118 loff_t pos = *ppos;
fe2c6338 6119 struct ctl_table lctl;
56d417b1
BH		 6120 int ret;
6121
013d97e9
FR		 6122 /*
6123 * ctl->data points to idev->cnf.disable_ipv6, we should
6124 * not modify it until we get the rtnl lock.
6125 */
6126 lctl = *ctl;
6127 lctl.data = &val;
6128
6129 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 6130
6131 if (write)
6132 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 6133 if (ret)
6134 *ppos = pos;
56d417b1
BH		 6135 return ret;
6136}
6137
c92d5491 6138static
6139int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6140 void __user *buffer, size_t *lenp, loff_t *ppos)
6141{
6142 int *valp = ctl->data;
6143 int ret;
6144 int old, new;
6145
6146 old = *valp;
6147 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6148 new = *valp;
6149
6150 if (write && old != new) {
6151 struct net *net = ctl->extra2;
6152
6153 if (!rtnl_trylock())
6154 return restart_syscall();
6155
6156 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
85b3daad
DA		 6157 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6158 NETCONFA_PROXY_NEIGH,
c92d5491 6159 NETCONFA_IFINDEX_DEFAULT,
6160 net->ipv6.devconf_dflt);
6161 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
85b3daad
DA		 6162 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6163 NETCONFA_PROXY_NEIGH,
c92d5491 6164 NETCONFA_IFINDEX_ALL,
6165 net->ipv6.devconf_all);
6166 else {
6167 struct inet6_dev *idev = ctl->extra1;
6168
85b3daad
DA		 6169 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6170 NETCONFA_PROXY_NEIGH,
c92d5491 6171 idev->dev->ifindex,
6172 &idev->cnf);
6173 }
6174 rtnl_unlock();
6175 }
6176
6177 return ret;
6178}
6179
d35a00b8
FJ		 6180static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6181 void __user *buffer, size_t *lenp,
6182 loff_t *ppos)
6183{
6184 int ret = 0;
c6dbf7aa 6185 u32 new_val;
d35a00b8
FJ		 6186 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6187 struct net *net = (struct net *)ctl->extra2;
c6dbf7aa
SD		 6188 struct ctl_table tmp = {
6189 .data = &new_val,
6190 .maxlen = sizeof(new_val),
6191 .mode = ctl->mode,
6192 };
d35a00b8 6193
8c171d6c
FJ		 6194 if (!rtnl_trylock())
6195 return restart_syscall();
6196
c6dbf7aa 6197 new_val = *((u32 *)ctl->data);
d35a00b8 6198
c6dbf7aa
SD		 6199 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6200 if (ret != 0)
6201 goto out;
d35a00b8 6202
c6dbf7aa 6203 if (write) {
8c171d6c
FJ		 6204 if (check_addr_gen_mode(new_val) < 0) {
6205 ret = -EINVAL;
6206 goto out;
6207 }
d35a00b8 6208
c6dbf7aa 6209 if (idev) {
8c171d6c
FJ		 6210 if (check_stable_privacy(idev, net, new_val) < 0) {
6211 ret = -EINVAL;
6212 goto out;
6213 }
d35a00b8
FJ		 6214
6215 if (idev->cnf.addr_gen_mode != new_val) {
6216 idev->cnf.addr_gen_mode = new_val;
d35a00b8 6217 addrconf_dev_config(idev->dev);
d35a00b8 6218 }
f24c5987
SD		 6219 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6220 struct net_device *dev;
6221
6222 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6223 for_each_netdev(net, dev) {
6224 idev = __in6_dev_get(dev);
6225 if (idev &&
6226 idev->cnf.addr_gen_mode != new_val) {
6227 idev->cnf.addr_gen_mode = new_val;
6228 addrconf_dev_config(idev->dev);
6229 }
6230 }
d35a00b8 6231 }
c6dbf7aa
SD		 6232
6233 *((u32 *)ctl->data) = new_val;
d35a00b8
FJ		 6234 }
6235
8c171d6c
FJ		 6236out:
6237 rtnl_unlock();
6238
d35a00b8
FJ		 6239 return ret;
6240}
6241
3d1bec99
HFS		 6242static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6243 void __user *buffer, size_t *lenp,
6244 loff_t *ppos)
6245{
6246 int err;
6247 struct in6_addr addr;
6248 char str[IPV6_MAX_STRLEN];
6249 struct ctl_table lctl = *ctl;
622c81d5 6250 struct net *net = ctl->extra2;
3d1bec99
HFS		 6251 struct ipv6_stable_secret *secret = ctl->data;
6252
622c81d5
HFS		 6253 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6254 return -EIO;
6255
3d1bec99
HFS		 6256 lctl.maxlen = IPV6_MAX_STRLEN;
6257 lctl.data = str;
6258
6259 if (!rtnl_trylock())
6260 return restart_syscall();
6261
6262 if (!write && !secret->initialized) {
6263 err = -EIO;
6264 goto out;
6265 }
6266
5449a5ca
WC		 6267 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6268 if (err >= sizeof(str)) {
6269 err = -EIO;
6270 goto out;
3d1bec99
HFS		 6271 }
6272
6273 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6274 if (err || !write)
6275 goto out;
6276
6277 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6278 err = -EIO;
6279 goto out;
6280 }
6281
6282 secret->initialized = true;
6283 secret->secret = addr;
6284
622c81d5
HFS		 6285 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6286 struct net_device *dev;
6287
6288 for_each_netdev(net, dev) {
6289 struct inet6_dev *idev = __in6_dev_get(dev);
6290
6291 if (idev) {
d35a00b8 6292 idev->cnf.addr_gen_mode =
622c81d5
HFS		 6293 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6294 }
6295 }
6296 } else {
6297 struct inet6_dev *idev = ctl->extra1;
6298
d35a00b8 6299 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
622c81d5
HFS		 6300 }
6301
3d1bec99
HFS		 6302out:
6303 rtnl_unlock();
6304
6305 return err;
6306}
c92d5491 6307
35103d11
AG		 6308static
6309int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6310 int write,
6311 void __user *buffer,
6312 size_t *lenp,
6313 loff_t *ppos)
6314{
6315 int *valp = ctl->data;
6316 int val = *valp;
6317 loff_t pos = *ppos;
6318 struct ctl_table lctl;
6319 int ret;
6320
6321 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6322 * we should not modify it until we get the rtnl lock.
6323 */
6324 lctl = *ctl;
6325 lctl.data = &val;
6326
6327 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6328
6329 if (write)
6330 ret = addrconf_fixup_linkdown(ctl, valp, val);
6331 if (ret)
6332 *ppos = pos;
6333 return ret;
6334}
6335
df789fe7
DF		 6336static
6337void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6338{
6339 if (rt) {
6340 if (action)
6341 rt->dst.flags |= DST_NOPOLICY;
6342 else
6343 rt->dst.flags &= ~DST_NOPOLICY;
6344 }
6345}
6346
6347static
6348void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6349{
6350 struct inet6_ifaddr *ifa;
6351
6352 read_lock_bh(&idev->lock);
6353 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6354 spin_lock(&ifa->lock);
6355 if (ifa->rt) {
f88d8ea6 6356 /* host routes only use builtin fib6_nh */
1cf844c7 6357 struct fib6_nh *nh = ifa->rt->fib6_nh;
df789fe7
DF		 6358 int cpu;
6359
66f5d6ce 6360 rcu_read_lock();
3b6761d1 6361 ifa->rt->dst_nopolicy = val ? true : false;
f40b6ae2 6362 if (nh->rt6i_pcpu) {
df789fe7
DF		 6363 for_each_possible_cpu(cpu) {
6364 struct rt6_info **rtp;
6365
f40b6ae2 6366 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
df789fe7
DF		 6367 addrconf_set_nopolicy(*rtp, val);
6368 }
6369 }
66f5d6ce 6370 rcu_read_unlock();
df789fe7
DF		 6371 }
6372 spin_unlock(&ifa->lock);
6373 }
6374 read_unlock_bh(&idev->lock);
6375}
6376
6377static
6378int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6379{
6380 struct inet6_dev *idev;
6381 struct net *net;
6382
6383 if (!rtnl_trylock())
6384 return restart_syscall();
6385
6386 *valp = val;
6387
6388 net = (struct net *)ctl->extra2;
6389 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6390 rtnl_unlock();
6391 return 0;
6392 }
6393
6394 if (valp == &net->ipv6.devconf_all->disable_policy) {
6395 struct net_device *dev;
6396
6397 for_each_netdev(net, dev) {
6398 idev = __in6_dev_get(dev);
6399 if (idev)
6400 addrconf_disable_policy_idev(idev, val);
6401 }
6402 } else {
6403 idev = (struct inet6_dev *)ctl->extra1;
6404 addrconf_disable_policy_idev(idev, val);
6405 }
6406
6407 rtnl_unlock();
6408 return 0;
6409}
6410
6411static
6412int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6413 void __user *buffer, size_t *lenp,
6414 loff_t *ppos)
6415{
6416 int *valp = ctl->data;
6417 int val = *valp;
6418 loff_t pos = *ppos;
6419 struct ctl_table lctl;
6420 int ret;
6421
6422 lctl = *ctl;
6423 lctl.data = &val;
6424 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6425
6426 if (write && (*valp != val))
6427 ret = addrconf_disable_policy(ctl, valp, val);
6428
6429 if (ret)
6430 *ppos = pos;
6431
6432 return ret;
6433}
6434
cb4a4c69 6435static int minus_one = -1;
cb9e684e
MŻ		 6436static const int two_five_five = 255;
6437
607ea7cd 6438static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 6439 {
6440 .procname = "forwarding",
6441 .data = &ipv6_devconf.forwarding,
6442 .maxlen = sizeof(int),
6443 .mode = 0644,
6444 .proc_handler = addrconf_sysctl_forward,
6445 },
6446 {
6447 .procname = "hop_limit",
6448 .data = &ipv6_devconf.hop_limit,
6449 .maxlen = sizeof(int),
6450 .mode = 0644,
cb9e684e 6451 .proc_handler = proc_dointvec_minmax,
eec4844f 6452 .extra1 = (void *)SYSCTL_ONE,
cb9e684e 6453 .extra2 = (void *)&two_five_five,
5df1f77f
KK		 6454 },
6455 {
6456 .procname = "mtu",
6457 .data = &ipv6_devconf.mtu6,
6458 .maxlen = sizeof(int),
6459 .mode = 0644,
6460 .proc_handler = addrconf_sysctl_mtu,
6461 },
6462 {
6463 .procname = "accept_ra",
6464 .data = &ipv6_devconf.accept_ra,
6465 .maxlen = sizeof(int),
6466 .mode = 0644,
6467 .proc_handler = proc_dointvec,
6468 },
6469 {
6470 .procname = "accept_redirects",
6471 .data = &ipv6_devconf.accept_redirects,
6472 .maxlen = sizeof(int),
6473 .mode = 0644,
6474 .proc_handler = proc_dointvec,
6475 },
6476 {
6477 .procname = "autoconf",
6478 .data = &ipv6_devconf.autoconf,
6479 .maxlen = sizeof(int),
6480 .mode = 0644,
6481 .proc_handler = proc_dointvec,
6482 },
6483 {
6484 .procname = "dad_transmits",
6485 .data = &ipv6_devconf.dad_transmits,
6486 .maxlen = sizeof(int),
6487 .mode = 0644,
6488 .proc_handler = proc_dointvec,
6489 },
6490 {
6491 .procname = "router_solicitations",
6492 .data = &ipv6_devconf.rtr_solicits,
6493 .maxlen = sizeof(int),
6494 .mode = 0644,
cb4a4c69
MŻ		 6495 .proc_handler = proc_dointvec_minmax,
6496 .extra1 = &minus_one,
5df1f77f
KK		 6497 },
6498 {
6499 .procname = "router_solicitation_interval",
6500 .data = &ipv6_devconf.rtr_solicit_interval,
6501 .maxlen = sizeof(int),
6502 .mode = 0644,
6503 .proc_handler = proc_dointvec_jiffies,
6504 },
bd11f074
MŻ		 6505 {
6506 .procname = "router_solicitation_max_interval",
6507 .data = &ipv6_devconf.rtr_solicit_max_interval,
6508 .maxlen = sizeof(int),
6509 .mode = 0644,
6510 .proc_handler = proc_dointvec_jiffies,
6511 },
5df1f77f
KK		 6512 {
6513 .procname = "router_solicitation_delay",
6514 .data = &ipv6_devconf.rtr_solicit_delay,
6515 .maxlen = sizeof(int),
6516 .mode = 0644,
6517 .proc_handler = proc_dointvec_jiffies,
6518 },
6519 {
6520 .procname = "force_mld_version",
6521 .data = &ipv6_devconf.force_mld_version,
6522 .maxlen = sizeof(int),
6523 .mode = 0644,
6524 .proc_handler = proc_dointvec,
6525 },
6526 {
6527 .procname = "mldv1_unsolicited_report_interval",
6528 .data =
6529 &ipv6_devconf.mldv1_unsolicited_report_interval,
6530 .maxlen = sizeof(int),
6531 .mode = 0644,
6532 .proc_handler = proc_dointvec_ms_jiffies,
6533 },
6534 {
6535 .procname = "mldv2_unsolicited_report_interval",
6536 .data =
6537 &ipv6_devconf.mldv2_unsolicited_report_interval,
6538 .maxlen = sizeof(int),
6539 .mode = 0644,
6540 .proc_handler = proc_dointvec_ms_jiffies,
6541 },
6542 {
6543 .procname = "use_tempaddr",
6544 .data = &ipv6_devconf.use_tempaddr,
6545 .maxlen = sizeof(int),
6546 .mode = 0644,
6547 .proc_handler = proc_dointvec,
6548 },
6549 {
6550 .procname = "temp_valid_lft",
6551 .data = &ipv6_devconf.temp_valid_lft,
6552 .maxlen = sizeof(int),
6553 .mode = 0644,
6554 .proc_handler = proc_dointvec,
6555 },
6556 {
6557 .procname = "temp_prefered_lft",
6558 .data = &ipv6_devconf.temp_prefered_lft,
6559 .maxlen = sizeof(int),
6560 .mode = 0644,
6561 .proc_handler = proc_dointvec,
6562 },
6563 {
6564 .procname = "regen_max_retry",
6565 .data = &ipv6_devconf.regen_max_retry,
6566 .maxlen = sizeof(int),
6567 .mode = 0644,
6568 .proc_handler = proc_dointvec,
6569 },
6570 {
6571 .procname = "max_desync_factor",
6572 .data = &ipv6_devconf.max_desync_factor,
6573 .maxlen = sizeof(int),
6574 .mode = 0644,
6575 .proc_handler = proc_dointvec,
6576 },
6577 {
6578 .procname = "max_addresses",
6579 .data = &ipv6_devconf.max_addresses,
6580 .maxlen = sizeof(int),
6581 .mode = 0644,
6582 .proc_handler = proc_dointvec,
6583 },
6584 {
6585 .procname = "accept_ra_defrtr",
6586 .data = &ipv6_devconf.accept_ra_defrtr,
6587 .maxlen = sizeof(int),
6588 .mode = 0644,
6589 .proc_handler = proc_dointvec,
6590 },
6591 {
6592 .procname = "accept_ra_min_hop_limit",
6593 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6594 .maxlen = sizeof(int),
6595 .mode = 0644,
6596 .proc_handler = proc_dointvec,
6597 },
6598 {
6599 .procname = "accept_ra_pinfo",
6600 .data = &ipv6_devconf.accept_ra_pinfo,
6601 .maxlen = sizeof(int),
6602 .mode = 0644,
6603 .proc_handler = proc_dointvec,
6604 },
930d6ff2 6605#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 6606 {
6607 .procname = "accept_ra_rtr_pref",
6608 .data = &ipv6_devconf.accept_ra_rtr_pref,
6609 .maxlen = sizeof(int),
6610 .mode = 0644,
6611 .proc_handler = proc_dointvec,
6612 },
6613 {
6614 .procname = "router_probe_interval",
6615 .data = &ipv6_devconf.rtr_probe_interval,
6616 .maxlen = sizeof(int),
6617 .mode = 0644,
6618 .proc_handler = proc_dointvec_jiffies,
6619 },
fa03ef38 6620#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b
JS		 6621 {
6622 .procname = "accept_ra_rt_info_min_plen",
6623 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6624 .maxlen = sizeof(int),
6625 .mode = 0644,
6626 .proc_handler = proc_dointvec,
6627 },
5df1f77f
KK		 6628 {
6629 .procname = "accept_ra_rt_info_max_plen",
6630 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6631 .maxlen = sizeof(int),
6632 .mode = 0644,
6633 .proc_handler = proc_dointvec,
6634 },
09c884d4 6635#endif
930d6ff2 6636#endif
5df1f77f
KK		 6637 {
6638 .procname = "proxy_ndp",
6639 .data = &ipv6_devconf.proxy_ndp,
6640 .maxlen = sizeof(int),
6641 .mode = 0644,
6642 .proc_handler = addrconf_sysctl_proxy_ndp,
6643 },
6644 {
6645 .procname = "accept_source_route",
6646 .data = &ipv6_devconf.accept_source_route,
6647 .maxlen = sizeof(int),
6648 .mode = 0644,
6649 .proc_handler = proc_dointvec,
6650 },
95c385b4 6651#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 6652 {
6653 .procname = "optimistic_dad",
6654 .data = &ipv6_devconf.optimistic_dad,
6655 .maxlen = sizeof(int),
6656 .mode = 0644,
6657 .proc_handler = proc_dointvec,
6658 },
6659 {
6660 .procname = "use_optimistic",
6661 .data = &ipv6_devconf.use_optimistic,
6662 .maxlen = sizeof(int),
6663 .mode = 0644,
6664 .proc_handler = proc_dointvec,
6665 },
7bc570c8
YH		 6666#endif
6667#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 6668 {
6669 .procname = "mc_forwarding",
6670 .data = &ipv6_devconf.mc_forwarding,
6671 .maxlen = sizeof(int),
6672 .mode = 0444,
6673 .proc_handler = proc_dointvec,
6674 },
95c385b4 6675#endif
5df1f77f
KK		 6676 {
6677 .procname = "disable_ipv6",
6678 .data = &ipv6_devconf.disable_ipv6,
6679 .maxlen = sizeof(int),
6680 .mode = 0644,
6681 .proc_handler = addrconf_sysctl_disable,
6682 },
6683 {
6684 .procname = "accept_dad",
6685 .data = &ipv6_devconf.accept_dad,
6686 .maxlen = sizeof(int),
6687 .mode = 0644,
6688 .proc_handler = proc_dointvec,
6689 },
6690 {
6691 .procname = "force_tllao",
6692 .data = &ipv6_devconf.force_tllao,
6693 .maxlen = sizeof(int),
6694 .mode = 0644,
6695 .proc_handler = proc_dointvec
6696 },
6697 {
6698 .procname = "ndisc_notify",
6699 .data = &ipv6_devconf.ndisc_notify,
6700 .maxlen = sizeof(int),
6701 .mode = 0644,
6702 .proc_handler = proc_dointvec
6703 },
6704 {
6705 .procname = "suppress_frag_ndisc",
6706 .data = &ipv6_devconf.suppress_frag_ndisc,
6707 .maxlen = sizeof(int),
6708 .mode = 0644,
6709 .proc_handler = proc_dointvec
6710 },
6711 {
6712 .procname = "accept_ra_from_local",
6713 .data = &ipv6_devconf.accept_ra_from_local,
6714 .maxlen = sizeof(int),
6715 .mode = 0644,
6716 .proc_handler = proc_dointvec,
6717 },
6718 {
6719 .procname = "accept_ra_mtu",
6720 .data = &ipv6_devconf.accept_ra_mtu,
6721 .maxlen = sizeof(int),
6722 .mode = 0644,
6723 .proc_handler = proc_dointvec,
6724 },
6725 {
6726 .procname = "stable_secret",
6727 .data = &ipv6_devconf.stable_secret,
6728 .maxlen = IPV6_MAX_STRLEN,
6729 .mode = 0600,
6730 .proc_handler = addrconf_sysctl_stable_secret,
6731 },
6732 {
6733 .procname = "use_oif_addrs_only",
6734 .data = &ipv6_devconf.use_oif_addrs_only,
6735 .maxlen = sizeof(int),
6736 .mode = 0644,
6737 .proc_handler = proc_dointvec,
6738 },
6739 {
6740 .procname = "ignore_routes_with_linkdown",
6741 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6742 .maxlen = sizeof(int),
6743 .mode = 0644,
6744 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6745 },
6746 {
6747 .procname = "drop_unicast_in_l2_multicast",
6748 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6749 .maxlen = sizeof(int),
6750 .mode = 0644,
6751 .proc_handler = proc_dointvec,
6752 },
6753 {
6754 .procname = "drop_unsolicited_na",
6755 .data = &ipv6_devconf.drop_unsolicited_na,
6756 .maxlen = sizeof(int),
6757 .mode = 0644,
6758 .proc_handler = proc_dointvec,
6759 },
6760 {
6761 .procname = "keep_addr_on_down",
6762 .data = &ipv6_devconf.keep_addr_on_down,
6763 .maxlen = sizeof(int),
6764 .mode = 0644,
6765 .proc_handler = proc_dointvec,
6766
6767 },
1ababeba
DL		 6768 {
6769 .procname = "seg6_enabled",
6770 .data = &ipv6_devconf.seg6_enabled,
6771 .maxlen = sizeof(int),
6772 .mode = 0644,
6773 .proc_handler = proc_dointvec,
6774 },
bf355b8d
DL		 6775#ifdef CONFIG_IPV6_SEG6_HMAC
6776 {
6777 .procname = "seg6_require_hmac",
6778 .data = &ipv6_devconf.seg6_require_hmac,
6779 .maxlen = sizeof(int),
6780 .mode = 0644,
6781 .proc_handler = proc_dointvec,
6782 },
6783#endif
adc176c5
EN		 6784 {
6785 .procname = "enhanced_dad",
6786 .data = &ipv6_devconf.enhanced_dad,
6787 .maxlen = sizeof(int),
6788 .mode = 0644,
6789 .proc_handler = proc_dointvec,
6790 },
d35a00b8
FJ		 6791 {
6792 .procname = "addr_gen_mode",
6793 .data = &ipv6_devconf.addr_gen_mode,
6794 .maxlen = sizeof(int),
6795 .mode = 0644,
6796 .proc_handler = addrconf_sysctl_addr_gen_mode,
6797 },
df789fe7
DF		 6798 {
6799 .procname = "disable_policy",
6800 .data = &ipv6_devconf.disable_policy,
6801 .maxlen = sizeof(int),
6802 .mode = 0644,
6803 .proc_handler = addrconf_sysctl_disable_policy,
6804 },
2210d6b2
MŻ		 6805 {
6806 .procname = "ndisc_tclass",
6807 .data = &ipv6_devconf.ndisc_tclass,
6808 .maxlen = sizeof(int),
6809 .mode = 0644,
6810 .proc_handler = proc_dointvec_minmax,
eec4844f 6811 .extra1 = (void *)SYSCTL_ZERO,
2210d6b2
MŻ		 6812 .extra2 = (void *)&two_five_five,
6813 },
5df1f77f
KK		 6814 {
6815 /* sentinel */
6816 }
1da177e4
LT		 6817};
6818
bff16c2f 6819static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 6820 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4 6821{
29c994e3 6822 int i, ifindex;
607ea7cd 6823 struct ctl_table *table;
6105e293 6824 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 6825
607ea7cd
KK		 6826 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6827 if (!table)
f68635e6
PE		 6828 goto out;
6829
607ea7cd
KK		 6830 for (i = 0; table[i].data; i++) {
6831 table[i].data += (char *)p - (char *)&ipv6_devconf;
cb9e684e
MŻ		 6832 /* If one of these is already set, then it is not safe to
6833 * overwrite either of them: this makes proc_dointvec_minmax
6834 * usable.
6835 */
6836 if (!table[i].extra1 && !table[i].extra2) {
6837 table[i].extra1 = idev; /* embedded; no ref */
6838 table[i].extra2 = net;
6839 }
1da177e4 6840 }
1da177e4 6841
6105e293 6842 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 6843
607ea7cd
KK		 6844 p->sysctl_header = register_net_sysctl(net, path, table);
6845 if (!p->sysctl_header)
6105e293 6846 goto free;
f68635e6 6847
29c994e3
ND		 6848 if (!strcmp(dev_name, "all"))
6849 ifindex = NETCONFA_IFINDEX_ALL;
6850 else if (!strcmp(dev_name, "default"))
6851 ifindex = NETCONFA_IFINDEX_DEFAULT;
6852 else
6853 ifindex = idev->dev->ifindex;
85b3daad
DA		 6854 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6855 ifindex, p);
95897312 6856 return 0;
1da177e4 6857
f68635e6 6858free:
607ea7cd 6859 kfree(table);
f68635e6 6860out:
95897312 6861 return -ENOBUFS;
1da177e4
LT		 6862}
6863
23452170
DA		 6864static void __addrconf_sysctl_unregister(struct net *net,
6865 struct ipv6_devconf *p, int ifindex)
408c4768 6866{
607ea7cd 6867 struct ctl_table *table;
408c4768 6868
607ea7cd 6869 if (!p->sysctl_header)
408c4768
PE		 6870 return;
6871
607ea7cd
KK		 6872 table = p->sysctl_header->ctl_table_arg;
6873 unregister_net_sysctl_table(p->sysctl_header);
6874 p->sysctl_header = NULL;
6875 kfree(table);
23452170
DA		 6876
6877 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
408c4768
PE		 6878}
6879
a317a2f1 6880static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 6881{
a317a2f1
WC		 6882 int err;
6883
6884 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6885 return -EINVAL;
6886
6887 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6888 &ndisc_ifinfo_sysctl_change);
6889 if (err)
6890 return err;
6891 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6892 idev, &idev->cnf);
6893 if (err)
6894 neigh_sysctl_unregister(idev->nd_parms);
6895
6896 return err;
f52295a9
PE		 6897}
6898
408c4768 6899static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 6900{
23452170
DA		 6901 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6902 idev->dev->ifindex);
408c4768 6903 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 6904}
6905
6906
6907#endif
6908
2c8c1e72 6909static int __net_init addrconf_init_net(struct net *net)
e0da5a48 6910{
a79ca223 6911 int err = -ENOMEM;
e0da5a48
PE		 6912 struct ipv6_devconf *all, *dflt;
6913
a79ca223 6914 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 6915 if (!all)
a79ca223 6916 goto err_alloc_all;
e0da5a48 6917
a79ca223 6918 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 6919 if (!dflt)
a79ca223 6920 goto err_alloc_dflt;
e0da5a48 6921
a154d5d8
AB		 6922 if (IS_ENABLED(CONFIG_SYSCTL) &&
6923 sysctl_devconf_inherit_init_net == 1 && !net_eq(net, &init_net)) {
856c395c
CW		 6924 memcpy(all, init_net.ipv6.devconf_all, sizeof(ipv6_devconf));
6925 memcpy(dflt, init_net.ipv6.devconf_dflt, sizeof(ipv6_devconf_dflt));
6926 }
6927
a79ca223
HZ		 6928 /* these will be inherited by all namespaces */
6929 dflt->autoconf = ipv6_defaults.autoconf;
6930 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 6931
3d1bec99
HFS		 6932 dflt->stable_secret.initialized = false;
6933 all->stable_secret.initialized = false;
6934
e0da5a48
PE		 6935 net->ipv6.devconf_all = all;
6936 net->ipv6.devconf_dflt = dflt;
6937
6938#ifdef CONFIG_SYSCTL
f8572d8f 6939 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 6940 if (err < 0)
6941 goto err_reg_all;
6942
f8572d8f 6943 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 6944 if (err < 0)
6945 goto err_reg_dflt;
6946#endif
6947 return 0;
6948
6949#ifdef CONFIG_SYSCTL
6950err_reg_dflt:
23452170 6951 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
e0da5a48
PE		 6952err_reg_all:
6953 kfree(dflt);
6954#endif
6955err_alloc_dflt:
6956 kfree(all);
6957err_alloc_all:
6958 return err;
6959}
6960
2c8c1e72 6961static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 6962{
6963#ifdef CONFIG_SYSCTL
23452170
DA		 6964 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6965 NETCONFA_IFINDEX_DEFAULT);
6966 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6967 NETCONFA_IFINDEX_ALL);
e0da5a48 6968#endif
73cf0e92 6969 kfree(net->ipv6.devconf_dflt);
6970 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 6971}
6972
6973static struct pernet_operations addrconf_ops = {
6974 .init = addrconf_init_net,
6975 .exit = addrconf_exit_net,
6976};
6977
207895fd 6978static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 6979 .family = AF_INET6,
6980 .fill_link_af = inet6_fill_link_af,
6981 .get_link_af_size = inet6_get_link_af_size,
11b1f828 6982 .validate_link_af = inet6_validate_link_af,
f53adae4 6983 .set_link_af = inet6_set_link_af,
b382b191
TG		 6984};
6985
1da177e4
LT		 6986/*
6987 * Init / cleanup code
6988 */
6989
6990int __init addrconf_init(void)
6991{
a317a2f1 6992 struct inet6_dev *idev;
c2e21293 6993 int i, err;
2a8cc6c8 6994
e21e8467
SH		 6995 err = ipv6_addr_label_init();
6996 if (err < 0) {
f3213831
JP		 6997 pr_crit("%s: cannot initialize default policy table: %d\n",
6998 __func__, err);
2cc6d2bf 6999 goto out;
2a8cc6c8 7000 }
1da177e4 7001
2cc6d2bf
NH		 7002 err = register_pernet_subsys(&addrconf_ops);
7003 if (err < 0)
7004 goto out_addrlabel;
e0da5a48 7005
c15b1cca
HFS		 7006 addrconf_wq = create_workqueue("ipv6_addrconf");
7007 if (!addrconf_wq) {
7008 err = -ENOMEM;
7009 goto out_nowq;
7010 }
7011
1da177e4
LT		 7012 /* The addrconf netdev notifier requires that loopback_dev
7013 * has it's ipv6 private information allocated and setup
7014 * before it can bring up and give link-local addresses
7015 * to other devices which are up.
7016 *
7017 * Unfortunately, loopback_dev is not necessarily the first
7018 * entry in the global dev_base list of net devices. In fact,
7019 * it is likely to be the very last entry on that list.
7020 * So this causes the notifier registry below to try and
7021 * give link-local addresses to all devices besides loopback_dev
7022 * first, then loopback_dev, which cases all the non-loopback_dev
7023 * devices to fail to get a link-local address.
7024 *
7025 * So, as a temporary fix, allocate the ipv6 structure for
7026 * loopback_dev first by hand.
7027 * Longer term, all of the dependencies ipv6 has upon the loopback
7028 * device and it being up should be removed.
7029 */
7030 rtnl_lock();
a317a2f1 7031 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 7032 rtnl_unlock();
a317a2f1
WC		 7033 if (IS_ERR(idev)) {
7034 err = PTR_ERR(idev);
e0da5a48 7035 goto errlo;
a317a2f1 7036 }
1da177e4 7037
2f460933
WC		 7038 ip6_route_init_special_entries();
7039
c2e21293 7040 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7041 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
7042
1da177e4
LT		 7043 register_netdevice_notifier(&ipv6_dev_notf);
7044
c15b1cca 7045 addrconf_verify();
c127ea2c 7046
3678a9d8 7047 rtnl_af_register(&inet6_ops);
b382b191 7048
16feebcf
FW		 7049 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7050 NULL, inet6_dump_ifinfo, 0);
c127ea2c
TG		 7051 if (err < 0)
7052 goto errout;
7053
16feebcf
FW		 7054 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7055 inet6_rtm_newaddr, NULL, 0);
7056 if (err < 0)
7057 goto errout;
7058 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7059 inet6_rtm_deladdr, NULL, 0);
7060 if (err < 0)
7061 goto errout;
7062 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7063 inet6_rtm_getaddr, inet6_dump_ifaddr,
7064 RTNL_FLAG_DOIT_UNLOCKED);
7065 if (err < 0)
7066 goto errout;
7067 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7068 NULL, inet6_dump_ifmcaddr, 0);
7069 if (err < 0)
7070 goto errout;
7071 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7072 NULL, inet6_dump_ifacaddr, 0);
7073 if (err < 0)
7074 goto errout;
7075 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7076 inet6_netconf_get_devconf,
7077 inet6_netconf_dump_devconf,
7078 RTNL_FLAG_DOIT_UNLOCKED);
7079 if (err < 0)
7080 goto errout;
a3fde2ad
FW		 7081 err = ipv6_addr_label_rtnl_register();
7082 if (err < 0)
7083 goto errout;
2a8cc6c8 7084
1da177e4 7085 return 0;
c127ea2c 7086errout:
16feebcf 7087 rtnl_unregister_all(PF_INET6);
b382b191 7088 rtnl_af_unregister(&inet6_ops);
c127ea2c 7089 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 7090errlo:
c15b1cca
HFS		 7091 destroy_workqueue(addrconf_wq);
7092out_nowq:
e0da5a48 7093 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 7094out_addrlabel:
7095 ipv6_addr_label_cleanup();
7096out:
c127ea2c 7097 return err;
1da177e4
LT		 7098}
7099
09f7709f 7100void addrconf_cleanup(void)
1da177e4 7101{
176c39af 7102 struct net_device *dev;
1da177e4
LT		 7103 int i;
7104
7105 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 7106 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 7107 ipv6_addr_label_cleanup();
1da177e4 7108
5c45121d 7109 rtnl_af_unregister(&inet6_ops);
1da177e4 7110
5c45121d 7111 rtnl_lock();
b382b191 7112
176c39af
DL		 7113 /* clean dev list */
7114 for_each_netdev(&init_net, dev) {
7115 if (__in6_dev_get(dev) == NULL)
7116 continue;
7117 addrconf_ifdown(dev, 1);
7118 }
7119 addrconf_ifdown(init_net.loopback_dev, 2);
7120
1da177e4
LT		 7121 /*
7122 * Check hash table.
7123 */
5c578aed 7124 spin_lock_bh(&addrconf_hash_lock);
c2e21293 7125 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7126 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 7127 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 7128 cancel_delayed_work(&addr_chk_work);
1da177e4 7129 rtnl_unlock();
c15b1cca
HFS		 7130
7131 destroy_workqueue(addrconf_wq);
1da177e4 7132}
Linux 6.x block layer and io_uring tree(s)