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net: move seq_file_single_net to <linux/seq_file_net.h>
[linux-block.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
174cd4b1 46#include <linux/sched/signal.h>
1da177e4
LT		 47#include <linux/socket.h>
48#include <linux/sockios.h>
1da177e4 49#include <linux/net.h>
3d1bec99 50#include <linux/inet.h>
1da177e4
LT		 51#include <linux/in6.h>
52#include <linux/netdevice.h>
1823730f 53#include <linux/if_addr.h>
1da177e4
LT		 54#include <linux/if_arp.h>
55#include <linux/if_arcnet.h>
56#include <linux/if_infiniband.h>
57#include <linux/route.h>
58#include <linux/inetdevice.h>
59#include <linux/init.h>
5a0e3ad6 60#include <linux/slab.h>
1da177e4
LT		 61#ifdef CONFIG_SYSCTL
62#include <linux/sysctl.h>
63#endif
4fc268d2 64#include <linux/capability.h>
1da177e4
LT		 65#include <linux/delay.h>
66#include <linux/notifier.h>
543537bd 67#include <linux/string.h>
ddbe5032 68#include <linux/hash.h>
1da177e4 69
457c4cbc 70#include <net/net_namespace.h>
1da177e4
LT		 71#include <net/sock.h>
72#include <net/snmp.h>
73
5241c2d7 74#include <net/6lowpan.h>
cb6bf355 75#include <net/firewire.h>
1da177e4
LT		 76#include <net/ipv6.h>
77#include <net/protocol.h>
78#include <net/ndisc.h>
79#include <net/ip6_route.h>
80#include <net/addrconf.h>
81#include <net/tcp.h>
82#include <net/ip.h>
5d620266 83#include <net/netlink.h>
f24e3d65 84#include <net/pkt_sched.h>
ca254490 85#include <net/l3mdev.h>
1da177e4
LT		 86#include <linux/if_tunnel.h>
87#include <linux/rtnetlink.h>
f3a1bfb1 88#include <linux/netconf.h>
1da177e4 89#include <linux/random.h>
e21e8467 90#include <linux/uaccess.h>
7f7d9a6b 91#include <asm/unaligned.h>
1da177e4
LT		 92
93#include <linux/proc_fs.h>
94#include <linux/seq_file.h>
bc3b2d7f 95#include <linux/export.h>
1da177e4 96
1da177e4 97#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e 98
3d1bec99
HFS		 99#define IPV6_MAX_STRLEN \
100 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
101
18a31e1e
TG		 102static inline u32 cstamp_delta(unsigned long cstamp)
103{
104 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
105}
1da177e4 106
bd11f074
MŻ		 107static inline s32 rfc3315_s14_backoff_init(s32 irt)
108{
109 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
110 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
111 do_div(tmp, 1000000);
112 return (s32)tmp;
113}
114
115static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
116{
117 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
118 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
119 do_div(tmp, 1000000);
120 if ((s32)tmp > mrt) {
121 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
122 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
123 do_div(tmp, 1000000);
124 }
125 return (s32)tmp;
126}
127
1da177e4 128#ifdef CONFIG_SYSCTL
a317a2f1 129static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 130static void addrconf_sysctl_unregister(struct inet6_dev *idev);
131#else
a317a2f1 132static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 133{
a317a2f1 134 return 0;
408c4768
PE		 135}
136
137static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
138{
139}
1da177e4
LT		 140#endif
141
9d6280da
JB		 142static void ipv6_regen_rndid(struct inet6_dev *idev);
143static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 144
1b34be74 145static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
d9bf82c2 146static int ipv6_count_addresses(const struct inet6_dev *idev);
622c81d5
HFS		 147static int ipv6_generate_stable_address(struct in6_addr *addr,
148 u8 dad_count,
149 const struct inet6_dev *idev);
1da177e4 150
27c565ae
ED		 151#define IN6_ADDR_HSIZE_SHIFT 8
152#define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
1da177e4
LT		 153/*
154 * Configured unicast address hash table
155 */
c2e21293 156static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 157static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 158
c15b1cca
HFS		 159static void addrconf_verify(void);
160static void addrconf_verify_rtnl(void);
161static void addrconf_verify_work(struct work_struct *);
1da177e4 162
c15b1cca
HFS		 163static struct workqueue_struct *addrconf_wq;
164static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 165
166static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
167static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
168
93d9b7d7
JP		 169static void addrconf_type_change(struct net_device *dev,
170 unsigned long event);
1da177e4
LT		 171static int addrconf_ifdown(struct net_device *dev, int how);
172
21caa662
RK		 173static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
174 int plen,
175 const struct net_device *dev,
176 u32 flags, u32 noflags);
177
cf22f9a2 178static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 179static void addrconf_dad_work(struct work_struct *w);
c76fe2d9
DA		 180static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
181 bool send_na);
c5e33bdd 182static void addrconf_dad_run(struct inet6_dev *idev);
e99e88a9 183static void addrconf_rs_timer(struct timer_list *t);
1da177e4
LT		 184static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
185static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
186
1ab1457c 187static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 188 struct prefix_info *pinfo);
1da177e4 189
888c848e 190static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 191 .forwarding = 0,
192 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
193 .mtu6 = IPV6_MIN_MTU,
194 .accept_ra = 1,
195 .accept_redirects = 1,
196 .autoconf = 1,
197 .force_mld_version = 0,
fc4eba58
HFS		 198 .mldv1_unsolicited_report_interval = 10 * HZ,
199 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 200 .dad_transmits = 1,
201 .rtr_solicits = MAX_RTR_SOLICITATIONS,
202 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 203 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 204 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 205 .use_tempaddr = 0,
1da177e4
LT		 206 .temp_valid_lft = TEMP_VALID_LIFETIME,
207 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
208 .regen_max_retry = REGEN_MAX_RETRY,
209 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 210 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 211 .accept_ra_defrtr = 1,
d9333196 212 .accept_ra_from_local = 0,
8013d1d7 213 .accept_ra_min_hop_limit= 1,
c4fd30eb 214 .accept_ra_pinfo = 1,
930d6ff2
YH		 215#ifdef CONFIG_IPV6_ROUTER_PREF
216 .accept_ra_rtr_pref = 1,
52e16356 217 .rtr_probe_interval = 60 * HZ,
09c884d4 218#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 219 .accept_ra_rt_info_min_plen = 0,
09c884d4
YH		 220 .accept_ra_rt_info_max_plen = 0,
221#endif
930d6ff2 222#endif
fbea49e1 223 .proxy_ndp = 0,
0bcbc926 224 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 225 .disable_ipv6 = 0,
09400953 226 .accept_dad = 0,
b800c3b9 227 .suppress_frag_ndisc = 1,
c2943f14 228 .accept_ra_mtu = 1,
3d1bec99
HFS		 229 .stable_secret = {
230 .initialized = false,
3985e8a3
EK		 231 },
232 .use_oif_addrs_only = 0,
35103d11 233 .ignore_routes_with_linkdown = 0,
f1705ec1 234 .keep_addr_on_down = 0,
1ababeba 235 .seg6_enabled = 0,
bf355b8d
DL		 236#ifdef CONFIG_IPV6_SEG6_HMAC
237 .seg6_require_hmac = 0,
238#endif
adc176c5 239 .enhanced_dad = 1,
d35a00b8 240 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
df789fe7 241 .disable_policy = 0,
1da177e4
LT		 242};
243
ab32ea5d 244static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 245 .forwarding = 0,
246 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
247 .mtu6 = IPV6_MIN_MTU,
248 .accept_ra = 1,
249 .accept_redirects = 1,
250 .autoconf = 1,
fc4eba58
HFS		 251 .force_mld_version = 0,
252 .mldv1_unsolicited_report_interval = 10 * HZ,
253 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 254 .dad_transmits = 1,
255 .rtr_solicits = MAX_RTR_SOLICITATIONS,
256 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 257 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 258 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 259 .use_tempaddr = 0,
260 .temp_valid_lft = TEMP_VALID_LIFETIME,
261 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
262 .regen_max_retry = REGEN_MAX_RETRY,
263 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 264 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 265 .accept_ra_defrtr = 1,
d9333196 266 .accept_ra_from_local = 0,
8013d1d7 267 .accept_ra_min_hop_limit= 1,
c4fd30eb 268 .accept_ra_pinfo = 1,
930d6ff2
YH		 269#ifdef CONFIG_IPV6_ROUTER_PREF
270 .accept_ra_rtr_pref = 1,
52e16356 271 .rtr_probe_interval = 60 * HZ,
09c884d4 272#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 273 .accept_ra_rt_info_min_plen = 0,
09c884d4
YH		 274 .accept_ra_rt_info_max_plen = 0,
275#endif
930d6ff2 276#endif
fbea49e1 277 .proxy_ndp = 0,
0bcbc926 278 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 279 .disable_ipv6 = 0,
1b34be74 280 .accept_dad = 1,
b800c3b9 281 .suppress_frag_ndisc = 1,
c2943f14 282 .accept_ra_mtu = 1,
3d1bec99
HFS		 283 .stable_secret = {
284 .initialized = false,
285 },
3985e8a3 286 .use_oif_addrs_only = 0,
35103d11 287 .ignore_routes_with_linkdown = 0,
f1705ec1 288 .keep_addr_on_down = 0,
1ababeba 289 .seg6_enabled = 0,
bf355b8d
DL		 290#ifdef CONFIG_IPV6_SEG6_HMAC
291 .seg6_require_hmac = 0,
292#endif
adc176c5 293 .enhanced_dad = 1,
d35a00b8 294 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
df789fe7 295 .disable_policy = 0,
1da177e4
LT		 296};
297
1f372c7b
MM		 298/* Check if link is ready: is it up and is a valid qdisc available */
299static inline bool addrconf_link_ready(const struct net_device *dev)
f24e3d65 300{
1f372c7b 301 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
f24e3d65
MC		 302}
303
b7b1bfce 304static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 305{
b7b1bfce
HFS		 306 if (del_timer(&idev->rs_timer))
307 __in6_dev_put(idev);
308}
309
c15b1cca 310static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 311{
c15b1cca 312 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 313 __in6_ifa_put(ifp);
314}
315
b7b1bfce
HFS		 316static void addrconf_mod_rs_timer(struct inet6_dev *idev,
317 unsigned long when)
318{
319 if (!timer_pending(&idev->rs_timer))
320 in6_dev_hold(idev);
321 mod_timer(&idev->rs_timer, jiffies + when);
322}
1da177e4 323
c15b1cca
HFS		 324static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
325 unsigned long delay)
1da177e4 326{
f8a894b2
XL		 327 in6_ifa_hold(ifp);
328 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
329 in6_ifa_put(ifp);
1da177e4
LT		 330}
331
7f7d9a6b
HX		 332static int snmp6_alloc_dev(struct inet6_dev *idev)
333{
827da44c
JS		 334 int i;
335
698365fa
WC		 336 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
337 if (!idev->stats.ipv6)
7f7d9a6b 338 goto err_ip;
827da44c
JS		 339
340 for_each_possible_cpu(i) {
341 struct ipstats_mib *addrconf_stats;
698365fa 342 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 343 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 344 }
345
346
be281e55
ED		 347 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
348 GFP_KERNEL);
349 if (!idev->stats.icmpv6dev)
7f7d9a6b 350 goto err_icmp;
be281e55
ED		 351 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
352 GFP_KERNEL);
353 if (!idev->stats.icmpv6msgdev)
14878f75 354 goto err_icmpmsg;
7f7d9a6b
HX		 355
356 return 0;
357
14878f75 358err_icmpmsg:
be281e55 359 kfree(idev->stats.icmpv6dev);
7f7d9a6b 360err_icmp:
698365fa 361 free_percpu(idev->stats.ipv6);
7f7d9a6b 362err_ip:
aaf70ec7 363 return -ENOMEM;
7f7d9a6b
HX		 364}
365
8e5e8f30 366static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 367{
368 struct inet6_dev *ndev;
a317a2f1 369 int err = -ENOMEM;
1da177e4
LT		 370
371 ASSERT_RTNL();
372
373 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 374 return ERR_PTR(-EINVAL);
1da177e4 375
1ab1457c 376 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
63159f29 377 if (!ndev)
a317a2f1 378 return ERR_PTR(err);
322f74a4
IO		 379
380 rwlock_init(&ndev->lock);
381 ndev->dev = dev;
502a2ffd 382 INIT_LIST_HEAD(&ndev->addr_list);
e99e88a9 383 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
c346dca1 384 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
9b29c696
HFS		 385
386 if (ndev->cnf.stable_secret.initialized)
d35a00b8 387 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
9b29c696 388 else
d35a00b8 389 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode;
9b29c696 390
322f74a4 391 ndev->cnf.mtu6 = dev->mtu;
322f74a4 392 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
63159f29 393 if (!ndev->nd_parms) {
322f74a4 394 kfree(ndev);
a317a2f1 395 return ERR_PTR(err);
322f74a4 396 }
0187bdfb
BH		 397 if (ndev->cnf.forwarding)
398 dev_disable_lro(dev);
322f74a4
IO		 399 /* We refer to the device */
400 dev_hold(dev);
1da177e4 401
322f74a4 402 if (snmp6_alloc_dev(ndev) < 0) {
e32ac250
JP		 403 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
404 __func__);
322f74a4 405 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 406 dev_put(dev);
407 kfree(ndev);
a317a2f1 408 return ERR_PTR(err);
322f74a4 409 }
1da177e4 410
322f74a4 411 if (snmp6_register_dev(ndev) < 0) {
e32ac250
JP		 412 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
413 __func__, dev->name);
a317a2f1 414 goto err_release;
322f74a4
IO		 415 }
416
9d6280da 417 /* One reference from device. */
1be92460 418 refcount_set(&ndev->refcnt, 1);
1da177e4 419
1b34be74
YH		 420 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
421 ndev->cnf.accept_dad = -1;
422
07a93626 423#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 424 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 425 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 426 ndev->cnf.rtr_solicits = 0;
427 }
428#endif
429
372e6c8f 430 INIT_LIST_HEAD(&ndev->tempaddr_list);
76506a98 431 ndev->desync_factor = U32_MAX;
322f74a4
IO		 432 if ((dev->flags&IFF_LOOPBACK) ||
433 dev->type == ARPHRD_TUNNEL ||
9625ed72 434 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 435 dev->type == ARPHRD_SIT ||
0be669bb 436 dev->type == ARPHRD_NONE) {
322f74a4 437 ndev->cnf.use_tempaddr = -1;
9d6280da
JB		 438 } else
439 ipv6_regen_rndid(ndev);
5d9efa7e 440
914faa14 441 ndev->token = in6addr_any;
1da177e4 442
1f372c7b 443 if (netif_running(dev) && addrconf_link_ready(dev))
53aadcc9
HX		 444 ndev->if_flags |= IF_READY;
445
322f74a4
IO		 446 ipv6_mc_init_dev(ndev);
447 ndev->tstamp = jiffies;
a317a2f1
WC		 448 err = addrconf_sysctl_register(ndev);
449 if (err) {
450 ipv6_mc_destroy_dev(ndev);
2a189f9e 451 snmp6_unregister_dev(ndev);
a317a2f1
WC		 452 goto err_release;
453 }
30c4cf57 454 /* protected by rtnl_lock */
cf778b00 455 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 456
2c5e8933
HFS		 457 /* Join interface-local all-node multicast group */
458 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
459
d88ae4cc 460 /* Join all-node multicast group */
f3ee4010 461 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 462
d6ddef9e 463 /* Join all-router multicast group if forwarding is set */
8b2aaede 464 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 465 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
466
1da177e4 467 return ndev;
a317a2f1
WC		 468
469err_release:
470 neigh_parms_release(&nd_tbl, ndev->nd_parms);
471 ndev->dead = 1;
472 in6_dev_finish_destroy(ndev);
473 return ERR_PTR(err);
1da177e4
LT		 474}
475
8e5e8f30 476static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 477{
478 struct inet6_dev *idev;
479
480 ASSERT_RTNL();
481
e21e8467
SH		 482 idev = __in6_dev_get(dev);
483 if (!idev) {
484 idev = ipv6_add_dev(dev);
a317a2f1 485 if (IS_ERR(idev))
1da177e4
LT		 486 return NULL;
487 }
c5e33bdd 488
1da177e4
LT		 489 if (dev->flags&IFF_UP)
490 ipv6_mc_up(idev);
491 return idev;
492}
493
f3a1bfb1
ND		 494static int inet6_netconf_msgsize_devconf(int type)
495{
496 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
497 + nla_total_size(4); /* NETCONFA_IFINDEX */
136ba622 498 bool all = false;
f3a1bfb1 499
136ba622
ZS		 500 if (type == NETCONFA_ALL)
501 all = true;
502
503 if (all || type == NETCONFA_FORWARDING)
f3a1bfb1 504 size += nla_total_size(4);
b1afce95 505#ifdef CONFIG_IPV6_MROUTE
136ba622 506 if (all || type == NETCONFA_MC_FORWARDING)
d67b8c61 507 size += nla_total_size(4);
b1afce95 508#endif
136ba622 509 if (all || type == NETCONFA_PROXY_NEIGH)
c92d5491 510 size += nla_total_size(4);
f3a1bfb1 511
136ba622 512 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
35103d11
AG		 513 size += nla_total_size(4);
514
f3a1bfb1
ND		 515 return size;
516}
517
518static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
519 struct ipv6_devconf *devconf, u32 portid,
520 u32 seq, int event, unsigned int flags,
521 int type)
522{
523 struct nlmsghdr *nlh;
524 struct netconfmsg *ncm;
136ba622 525 bool all = false;
f3a1bfb1
ND		 526
527 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
528 flags);
63159f29 529 if (!nlh)
f3a1bfb1
ND		 530 return -EMSGSIZE;
531
136ba622
ZS		 532 if (type == NETCONFA_ALL)
533 all = true;
534
f3a1bfb1
ND		 535 ncm = nlmsg_data(nlh);
536 ncm->ncm_family = AF_INET6;
537
538 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
539 goto nla_put_failure;
540
23452170
DA		 541 if (!devconf)
542 goto out;
543
136ba622 544 if ((all || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 545 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
546 goto nla_put_failure;
b1afce95 547#ifdef CONFIG_IPV6_MROUTE
136ba622 548 if ((all || type == NETCONFA_MC_FORWARDING) &&
d67b8c61
ND		 549 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
550 devconf->mc_forwarding) < 0)
551 goto nla_put_failure;
b1afce95 552#endif
136ba622 553 if ((all || type == NETCONFA_PROXY_NEIGH) &&
c92d5491 554 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
555 goto nla_put_failure;
556
136ba622 557 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
35103d11
AG		 558 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
559 devconf->ignore_routes_with_linkdown) < 0)
560 goto nla_put_failure;
561
23452170 562out:
053c095a
JB		 563 nlmsg_end(skb, nlh);
564 return 0;
f3a1bfb1
ND		 565
566nla_put_failure:
567 nlmsg_cancel(skb, nlh);
568 return -EMSGSIZE;
569}
570
85b3daad
DA		 571void inet6_netconf_notify_devconf(struct net *net, int event, int type,
572 int ifindex, struct ipv6_devconf *devconf)
f3a1bfb1
ND		 573{
574 struct sk_buff *skb;
575 int err = -ENOBUFS;
576
927265bc 577 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
63159f29 578 if (!skb)
f3a1bfb1
ND		 579 goto errout;
580
581 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
85b3daad 582 event, 0, type);
f3a1bfb1
ND		 583 if (err < 0) {
584 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
585 WARN_ON(err == -EMSGSIZE);
586 kfree_skb(skb);
587 goto errout;
588 }
927265bc 589 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
f3a1bfb1
ND		 590 return;
591errout:
bd779028 592 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 593}
594
76f8f6cb
ND		 595static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
596 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
597 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 598 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
35103d11 599 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
76f8f6cb
ND		 600};
601
602static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
c21ef3e3
DA		 603 struct nlmsghdr *nlh,
604 struct netlink_ext_ack *extack)
76f8f6cb
ND		 605{
606 struct net *net = sock_net(in_skb->sk);
607 struct nlattr *tb[NETCONFA_MAX+1];
4ea2607f
FW		 608 struct inet6_dev *in6_dev = NULL;
609 struct net_device *dev = NULL;
76f8f6cb
ND		 610 struct netconfmsg *ncm;
611 struct sk_buff *skb;
612 struct ipv6_devconf *devconf;
76f8f6cb
ND		 613 int ifindex;
614 int err;
615
616 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
c21ef3e3 617 devconf_ipv6_policy, extack);
76f8f6cb 618 if (err < 0)
4ea2607f 619 return err;
76f8f6cb 620
76f8f6cb 621 if (!tb[NETCONFA_IFINDEX])
4ea2607f 622 return -EINVAL;
76f8f6cb 623
4ea2607f 624 err = -EINVAL;
76f8f6cb
ND		 625 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
626 switch (ifindex) {
627 case NETCONFA_IFINDEX_ALL:
628 devconf = net->ipv6.devconf_all;
629 break;
630 case NETCONFA_IFINDEX_DEFAULT:
631 devconf = net->ipv6.devconf_dflt;
632 break;
633 default:
4ea2607f 634 dev = dev_get_by_index(net, ifindex);
63159f29 635 if (!dev)
4ea2607f
FW		 636 return -EINVAL;
637 in6_dev = in6_dev_get(dev);
63159f29 638 if (!in6_dev)
76f8f6cb
ND		 639 goto errout;
640 devconf = &in6_dev->cnf;
641 break;
642 }
643
644 err = -ENOBUFS;
4ea2607f 645 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
63159f29 646 if (!skb)
76f8f6cb
ND		 647 goto errout;
648
649 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
650 NETLINK_CB(in_skb).portid,
651 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
136ba622 652 NETCONFA_ALL);
76f8f6cb
ND		 653 if (err < 0) {
654 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
655 WARN_ON(err == -EMSGSIZE);
656 kfree_skb(skb);
657 goto errout;
658 }
659 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
660errout:
4ea2607f
FW		 661 if (in6_dev)
662 in6_dev_put(in6_dev);
663 if (dev)
664 dev_put(dev);
76f8f6cb
ND		 665 return err;
666}
667
7a674200
ND		 668static int inet6_netconf_dump_devconf(struct sk_buff *skb,
669 struct netlink_callback *cb)
670{
671 struct net *net = sock_net(skb->sk);
672 int h, s_h;
673 int idx, s_idx;
674 struct net_device *dev;
675 struct inet6_dev *idev;
676 struct hlist_head *head;
677
678 s_h = cb->args[0];
679 s_idx = idx = cb->args[1];
680
681 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
682 idx = 0;
683 head = &net->dev_index_head[h];
684 rcu_read_lock();
63998ac2
ND		 685 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
686 net->dev_base_seq;
7a674200
ND		 687 hlist_for_each_entry_rcu(dev, head, index_hlist) {
688 if (idx < s_idx)
689 goto cont;
690 idev = __in6_dev_get(dev);
691 if (!idev)
692 goto cont;
693
694 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
695 &idev->cnf,
696 NETLINK_CB(cb->skb).portid,
697 cb->nlh->nlmsg_seq,
698 RTM_NEWNETCONF,
699 NLM_F_MULTI,
136ba622 700 NETCONFA_ALL) < 0) {
7a674200
ND		 701 rcu_read_unlock();
702 goto done;
703 }
63998ac2 704 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 705cont:
706 idx++;
707 }
708 rcu_read_unlock();
709 }
710 if (h == NETDEV_HASHENTRIES) {
711 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
712 net->ipv6.devconf_all,
713 NETLINK_CB(cb->skb).portid,
714 cb->nlh->nlmsg_seq,
715 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 716 NETCONFA_ALL) < 0)
7a674200
ND		 717 goto done;
718 else
719 h++;
720 }
721 if (h == NETDEV_HASHENTRIES + 1) {
722 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
723 net->ipv6.devconf_dflt,
724 NETLINK_CB(cb->skb).portid,
725 cb->nlh->nlmsg_seq,
726 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 727 NETCONFA_ALL) < 0)
7a674200
ND		 728 goto done;
729 else
730 h++;
731 }
732done:
733 cb->args[0] = h;
734 cb->args[1] = idx;
735
736 return skb->len;
737}
738
1da177e4
LT		 739#ifdef CONFIG_SYSCTL
740static void dev_forward_change(struct inet6_dev *idev)
741{
742 struct net_device *dev;
743 struct inet6_ifaddr *ifa;
1da177e4
LT		 744
745 if (!idev)
746 return;
747 dev = idev->dev;
0187bdfb
BH		 748 if (idev->cnf.forwarding)
749 dev_disable_lro(dev);
1a940835 750 if (dev->flags & IFF_MULTICAST) {
2c5e8933 751 if (idev->cnf.forwarding) {
f3ee4010 752 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 753 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
754 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
755 } else {
f3ee4010 756 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 757 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
758 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
759 }
1da177e4 760 }
502a2ffd 761
762 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 763 if (ifa->flags&IFA_F_TENTATIVE)
764 continue;
1da177e4
LT		 765 if (idev->cnf.forwarding)
766 addrconf_join_anycast(ifa);
767 else
768 addrconf_leave_anycast(ifa);
769 }
85b3daad
DA		 770 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
771 NETCONFA_FORWARDING,
f3a1bfb1 772 dev->ifindex, &idev->cnf);
1da177e4
LT		 773}
774
775
e186932b 776static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 777{
778 struct net_device *dev;
779 struct inet6_dev *idev;
780
4acd4945 781 for_each_netdev(net, dev) {
1da177e4
LT		 782 idev = __in6_dev_get(dev);
783 if (idev) {
e186932b
PE		 784 int changed = (!idev->cnf.forwarding) ^ (!newf);
785 idev->cnf.forwarding = newf;
1da177e4
LT		 786 if (changed)
787 dev_forward_change(idev);
788 }
1da177e4 789 }
1da177e4 790}
c8fecf22 791
013d97e9 792static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 793{
bff16c2f 794 struct net *net;
013d97e9
FR		 795 int old;
796
797 if (!rtnl_trylock())
798 return restart_syscall();
bff16c2f
PE		 799
800 net = (struct net *)table->extra2;
013d97e9
FR		 801 old = *p;
802 *p = newf;
b325fddb 803
013d97e9 804 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1 805 if ((!newf) ^ (!old))
85b3daad
DA		 806 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
807 NETCONFA_FORWARDING,
f3a1bfb1
ND		 808 NETCONFA_IFINDEX_DEFAULT,
809 net->ipv6.devconf_dflt);
013d97e9
FR		 810 rtnl_unlock();
811 return 0;
88af182e 812 }
c8fecf22 813
e186932b 814 if (p == &net->ipv6.devconf_all->forwarding) {
d26c638c
ND		 815 int old_dflt = net->ipv6.devconf_dflt->forwarding;
816
e186932b 817 net->ipv6.devconf_dflt->forwarding = newf;
d26c638c 818 if ((!newf) ^ (!old_dflt))
85b3daad
DA		 819 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
820 NETCONFA_FORWARDING,
d26c638c
ND		 821 NETCONFA_IFINDEX_DEFAULT,
822 net->ipv6.devconf_dflt);
823
e186932b 824 addrconf_forward_change(net, newf);
f3a1bfb1 825 if ((!newf) ^ (!old))
85b3daad
DA		 826 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
827 NETCONFA_FORWARDING,
f3a1bfb1
ND		 828 NETCONFA_IFINDEX_ALL,
829 net->ipv6.devconf_all);
013d97e9 830 } else if ((!newf) ^ (!old))
c8fecf22 831 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 832 rtnl_unlock();
c8fecf22 833
013d97e9 834 if (newf)
7b4da532 835 rt6_purge_dflt_routers(net);
b325fddb 836 return 1;
c8fecf22 837}
35103d11
AG		 838
839static void addrconf_linkdown_change(struct net *net, __s32 newf)
840{
841 struct net_device *dev;
842 struct inet6_dev *idev;
843
844 for_each_netdev(net, dev) {
845 idev = __in6_dev_get(dev);
846 if (idev) {
847 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
848
849 idev->cnf.ignore_routes_with_linkdown = newf;
850 if (changed)
851 inet6_netconf_notify_devconf(dev_net(dev),
85b3daad 852 RTM_NEWNETCONF,
35103d11
AG		 853 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
854 dev->ifindex,
855 &idev->cnf);
856 }
857 }
858}
859
860static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
861{
862 struct net *net;
863 int old;
864
865 if (!rtnl_trylock())
866 return restart_syscall();
867
868 net = (struct net *)table->extra2;
869 old = *p;
870 *p = newf;
871
872 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
873 if ((!newf) ^ (!old))
874 inet6_netconf_notify_devconf(net,
85b3daad 875 RTM_NEWNETCONF,
35103d11
AG		 876 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
877 NETCONFA_IFINDEX_DEFAULT,
878 net->ipv6.devconf_dflt);
879 rtnl_unlock();
880 return 0;
881 }
882
883 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
884 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
885 addrconf_linkdown_change(net, newf);
886 if ((!newf) ^ (!old))
887 inet6_netconf_notify_devconf(net,
85b3daad 888 RTM_NEWNETCONF,
35103d11
AG		 889 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
890 NETCONFA_IFINDEX_ALL,
891 net->ipv6.devconf_all);
892 }
893 rtnl_unlock();
894
895 return 1;
896}
897
1da177e4
LT		 898#endif
899
5c578aed 900/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 901void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
902{
c2e21293 903 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 904
1da177e4 905#ifdef NET_REFCNT_DEBUG
91df42be 906 pr_debug("%s\n", __func__);
1da177e4
LT		 907#endif
908
909 in6_dev_put(ifp->idev);
910
c15b1cca
HFS		 911 if (cancel_delayed_work(&ifp->dad_work))
912 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
913 ifp);
1da177e4 914
e9d3e084 915 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 916 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 917 return;
918 }
94e187c0 919 ip6_rt_put(ifp->rt);
1da177e4 920
e5785985 921 kfree_rcu(ifp, rcu);
1da177e4
LT		 922}
923
e55ffac6
BH		 924static void
925ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
926{
502a2ffd 927 struct list_head *p;
8a6ce0c0 928 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 929
930 /*
931 * Each device address list is sorted in order of scope -
932 * global before linklocal.
933 */
502a2ffd 934 list_for_each(p, &idev->addr_list) {
935 struct inet6_ifaddr *ifa
936 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 937 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 938 break;
939 }
940
8ef802aa 941 list_add_tail_rcu(&ifp->if_list, p);
e55ffac6
BH		 942}
943
3f27fb23 944static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
3eb84f49 945{
3f27fb23
ED		 946 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
947
948 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 949}
950
56fc709b 951static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
752a9292 952 struct net_device *dev, unsigned int hash)
56fc709b 953{
56fc709b
ED		 954 struct inet6_ifaddr *ifp;
955
956 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
957 if (!net_eq(dev_net(ifp->idev->dev), net))
958 continue;
959 if (ipv6_addr_equal(&ifp->addr, addr)) {
960 if (!dev || ifp->idev->dev == dev)
961 return true;
962 }
963 }
964 return false;
965}
966
f3d9832e
DA		 967static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
968{
3f27fb23 969 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
f3d9832e
DA		 970 int err = 0;
971
972 spin_lock(&addrconf_hash_lock);
973
974 /* Ignore adding duplicate addresses on an interface */
752a9292 975 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
e32ac250 976 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
f3d9832e 977 err = -EEXIST;
752a9292
ED		 978 } else {
979 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
f3d9832e
DA		 980 }
981
f3d9832e
DA		 982 spin_unlock(&addrconf_hash_lock);
983
984 return err;
985}
986
1da177e4
LT		 987/* On success it returns ifp with increased reference count */
988
989static struct inet6_ifaddr *
3f8f5298
JP		 990ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
991 const struct in6_addr *peer_addr, int pfxlen,
f3d9832e 992 int scope, u32 flags, u32 valid_lft, u32 prefered_lft,
de95e047 993 bool can_block, struct netlink_ext_ack *extack)
1da177e4 994{
f3d9832e 995 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
df789fe7 996 struct net *net = dev_net(idev->dev);
1da177e4 997 struct inet6_ifaddr *ifa = NULL;
f3d9832e 998 struct rt6_info *rt = NULL;
1da177e4 999 int err = 0;
d68b8270
YH		 1000 int addr_type = ipv6_addr_type(addr);
1001
1002 if (addr_type == IPV6_ADDR_ANY ||
1003 addr_type & IPV6_ADDR_MULTICAST ||
1004 (!(idev->dev->flags & IFF_LOOPBACK) &&
1005 addr_type & IPV6_ADDR_LOOPBACK))
1006 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 1007
1da177e4
LT		 1008 if (idev->dead) {
1009 err = -ENODEV; /*XXX*/
f3d9832e 1010 goto out;
1da177e4
LT		 1011 }
1012
56d417b1 1013 if (idev->cnf.disable_ipv6) {
9bdd8d40 1014 err = -EACCES;
f3d9832e 1015 goto out;
9bdd8d40
BH		 1016 }
1017
ff7883ea
DA		 1018 /* validator notifier needs to be blocking;
1019 * do not call in atomic context
1020 */
1021 if (can_block) {
1022 struct in6_validator_info i6vi = {
1023 .i6vi_addr = *addr,
1024 .i6vi_dev = idev,
de95e047 1025 .extack = extack,
ff7883ea
DA		 1026 };
1027
1028 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1029 err = notifier_to_errno(err);
1030 if (err < 0)
1031 goto out;
1032 }
1da177e4 1033
f3d9832e 1034 ifa = kzalloc(sizeof(*ifa), gfp_flags);
63159f29 1035 if (!ifa) {
1da177e4
LT		 1036 err = -ENOBUFS;
1037 goto out;
1038 }
1039
8f031519 1040 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 1041 if (IS_ERR(rt)) {
1042 err = PTR_ERR(rt);
f3d9832e 1043 rt = NULL;
1da177e4
LT		 1044 goto out;
1045 }
1046
df789fe7
DF		 1047 if (net->ipv6.devconf_all->disable_policy ||
1048 idev->cnf.disable_policy)
1049 rt->dst.flags |= DST_NOPOLICY;
1050
bba24896
JP		 1051 neigh_parms_data_state_setall(idev->nd_parms);
1052
4e3fd7a0 1053 ifa->addr = *addr;
3f8f5298
JP		 1054 if (peer_addr)
1055 ifa->peer_addr = *peer_addr;
1da177e4
LT		 1056
1057 spin_lock_init(&ifa->lock);
c15b1cca 1058 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 1059 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 1060 ifa->scope = scope;
1061 ifa->prefix_len = pfxlen;
66eb9f86
MB		 1062 ifa->flags = flags;
1063 /* No need to add the TENTATIVE flag for addresses with NODAD */
1064 if (!(flags & IFA_F_NODAD))
1065 ifa->flags |= IFA_F_TENTATIVE;
8a226b2c
JB		 1066 ifa->valid_lft = valid_lft;
1067 ifa->prefered_lft = prefered_lft;
1da177e4 1068 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 1069 ifa->tokenized = false;
1da177e4 1070
57f5f544
KF		 1071 ifa->rt = rt;
1072
1da177e4 1073 ifa->idev = idev;
f3d9832e
DA		 1074 in6_dev_hold(idev);
1075
1da177e4 1076 /* For caller */
271201c0 1077 refcount_set(&ifa->refcnt, 1);
1da177e4 1078
f3d9832e 1079 rcu_read_lock_bh();
1da177e4 1080
f3d9832e
DA		 1081 err = ipv6_add_addr_hash(idev->dev, ifa);
1082 if (err < 0) {
1083 rcu_read_unlock_bh();
1084 goto out;
1085 }
1da177e4
LT		 1086
1087 write_lock(&idev->lock);
f3d9832e 1088
1da177e4 1089 /* Add to inet6_dev unicast addr list. */
e55ffac6 1090 ipv6_link_dev_addr(idev, ifa);
1da177e4 1091
1da177e4 1092 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 1093 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 1094 in6_ifa_hold(ifa);
1095 }
1da177e4 1096
1da177e4
LT		 1097 in6_ifa_hold(ifa);
1098 write_unlock(&idev->lock);
f3d9832e 1099
8814c4b5 1100 rcu_read_unlock_bh();
1da177e4 1101
f3d9832e
DA		 1102 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1103out:
1104 if (unlikely(err < 0)) {
1105 if (rt)
1106 ip6_rt_put(rt);
1107 if (ifa) {
1108 if (ifa->idev)
1109 in6_dev_put(ifa->idev);
1110 kfree(ifa);
1111 }
1da177e4
LT		 1112 ifa = ERR_PTR(err);
1113 }
1114
1115 return ifa;
1da177e4
LT		 1116}
1117
5b84efec
TH		 1118enum cleanup_prefix_rt_t {
1119 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1120 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1121 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1122};
1123
1124/*
1125 * Check, whether the prefix for ifp would still need a prefix route
1126 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1127 * constants.
1128 *
1129 * 1) we don't purge prefix if address was not permanent.
1130 * prefix is managed by its own lifetime.
1131 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1132 * 3) if there are no addresses, delete prefix.
1133 * 4) if there are still other permanent address(es),
1134 * corresponding prefix is still permanent.
1135 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1136 * don't purge the prefix, assume user space is managing it.
1137 * 6) otherwise, update prefix lifetime to the
1138 * longest valid lifetime among the corresponding
1139 * addresses on the device.
1140 * Note: subsequent RA will update lifetime.
1141 **/
1142static enum cleanup_prefix_rt_t
1143check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1144{
1145 struct inet6_ifaddr *ifa;
1146 struct inet6_dev *idev = ifp->idev;
1147 unsigned long lifetime;
1148 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1149
1150 *expires = jiffies;
1151
1152 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1153 if (ifa == ifp)
1154 continue;
1155 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1156 ifp->prefix_len))
1157 continue;
1158 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1159 return CLEANUP_PREFIX_RT_NOP;
1160
1161 action = CLEANUP_PREFIX_RT_EXPIRE;
1162
1163 spin_lock(&ifa->lock);
1164
1165 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1166 /*
1167 * Note: Because this address is
1168 * not permanent, lifetime <
1169 * LONG_MAX / HZ here.
1170 */
1171 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1172 *expires = ifa->tstamp + lifetime * HZ;
1173 spin_unlock(&ifa->lock);
1174 }
1175
1176 return action;
1177}
1178
1179static void
1180cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1181{
1182 struct rt6_info *rt;
1183
1184 rt = addrconf_get_prefix_route(&ifp->addr,
1185 ifp->prefix_len,
1186 ifp->idev->dev,
1187 0, RTF_GATEWAY | RTF_DEFAULT);
1188 if (rt) {
1189 if (del_rt)
1190 ip6_del_rt(rt);
1191 else {
1192 if (!(rt->rt6i_flags & RTF_EXPIRES))
1193 rt6_set_expires(rt, expires);
1194 ip6_rt_put(rt);
1195 }
1196 }
1197}
1198
1199
1da177e4
LT		 1200/* This function wants to get referenced ifp and releases it before return */
1201
1202static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1203{
4c5ff6a6 1204 int state;
5b84efec
TH		 1205 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1206 unsigned long expires;
1da177e4 1207
c15b1cca
HFS		 1208 ASSERT_RTNL();
1209
8e8e676d 1210 spin_lock_bh(&ifp->lock);
4c5ff6a6 1211 state = ifp->state;
e9d3e084 1212 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1213 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1214
1215 if (state == INET6_IFADDR_STATE_DEAD)
1216 goto out;
1da177e4 1217
5c578aed 1218 spin_lock_bh(&addrconf_hash_lock);
1219 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1220 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1221
5b84efec 1222 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1223
1da177e4 1224 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1225 list_del(&ifp->tmp_list);
1226 if (ifp->ifpub) {
1227 in6_ifa_put(ifp->ifpub);
1228 ifp->ifpub = NULL;
1da177e4 1229 }
372e6c8f 1230 __in6_ifa_put(ifp);
1da177e4 1231 }
1da177e4 1232
5b84efec
TH		 1233 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1234 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1235
8ef802aa 1236 list_del_rcu(&ifp->if_list);
5b84efec
TH		 1237 __in6_ifa_put(ifp);
1238
1239 write_unlock_bh(&ifp->idev->lock);
1da177e4 1240
c15b1cca 1241 addrconf_del_dad_work(ifp);
b2238566 1242
1da177e4
LT		 1243 ipv6_ifa_notify(RTM_DELADDR, ifp);
1244
f88c91dd 1245 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1246
5b84efec
TH		 1247 if (action != CLEANUP_PREFIX_RT_NOP) {
1248 cleanup_prefix_route(ifp, expires,
1249 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1250 }
1251
c3968a85
DW		 1252 /* clean up prefsrc entries */
1253 rt6_remove_prefsrc(ifp);
4c5ff6a6 1254out:
1da177e4
LT		 1255 in6_ifa_put(ifp);
1256}
1257
fffcefe9
ED		 1258static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp,
1259 struct inet6_ifaddr *ift,
1260 bool block)
1da177e4
LT		 1261{
1262 struct inet6_dev *idev = ifp->idev;
1263 struct in6_addr addr, *tmpaddr;
76f793e3 1264 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1265 unsigned long regen_advance;
1da177e4
LT		 1266 int tmp_plen;
1267 int ret = 0;
95c385b4 1268 u32 addr_flags;
76f793e3 1269 unsigned long now = jiffies;
76506a98 1270 long max_desync_factor;
7aa8e63f 1271 s32 cnf_temp_preferred_lft;
1da177e4 1272
53bd6749 1273 write_lock_bh(&idev->lock);
1da177e4
LT		 1274 if (ift) {
1275 spin_lock_bh(&ift->lock);
1276 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1277 spin_unlock_bh(&ift->lock);
1278 tmpaddr = &addr;
1279 } else {
1280 tmpaddr = NULL;
1281 }
1282retry:
1283 in6_dev_hold(idev);
1284 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1285 write_unlock_bh(&idev->lock);
f3213831 1286 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1287 in6_dev_put(idev);
1288 ret = -1;
1289 goto out;
1290 }
1291 spin_lock_bh(&ifp->lock);
1292 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1293 idev->cnf.use_tempaddr = -1; /*XXX*/
1294 spin_unlock_bh(&ifp->lock);
53bd6749 1295 write_unlock_bh(&idev->lock);
f3213831
JP		 1296 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1297 __func__);
1da177e4
LT		 1298 in6_dev_put(idev);
1299 ret = -1;
1300 goto out;
1301 }
1302 in6_ifa_hold(ifp);
1303 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
9d6280da 1304 ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1305 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1306 age = (now - ifp->tstamp) / HZ;
76506a98
JB		 1307
1308 regen_advance = idev->cnf.regen_max_retry *
1309 idev->cnf.dad_transmits *
1310 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1311
1312 /* recalculate max_desync_factor each time and update
1313 * idev->desync_factor if it's larger
1314 */
7aa8e63f 1315 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
76506a98
JB		 1316 max_desync_factor = min_t(__u32,
1317 idev->cnf.max_desync_factor,
7aa8e63f 1318 cnf_temp_preferred_lft - regen_advance);
76506a98
JB		 1319
1320 if (unlikely(idev->desync_factor > max_desync_factor)) {
1321 if (max_desync_factor > 0) {
1322 get_random_bytes(&idev->desync_factor,
1323 sizeof(idev->desync_factor));
1324 idev->desync_factor %= max_desync_factor;
1325 } else {
1326 idev->desync_factor = 0;
1327 }
1328 }
1329
1da177e4
LT		 1330 tmp_valid_lft = min_t(__u32,
1331 ifp->valid_lft,
7a876b0e 1332 idev->cnf.temp_valid_lft + age);
7aa8e63f 1333 tmp_prefered_lft = cnf_temp_preferred_lft + age -
76506a98 1334 idev->desync_factor;
76506a98 1335 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1da177e4 1336 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1337 tmp_tstamp = ifp->tstamp;
1338 spin_unlock_bh(&ifp->lock);
1339
53bd6749 1340 write_unlock_bh(&idev->lock);
95c385b4 1341
eac55bf9
BB		 1342 /* A temporary address is created only if this calculated Preferred
1343 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1344 * an implementation must not create a temporary address with a zero
1345 * Preferred Lifetime.
ecab6701
HK		 1346 * Use age calculation as in addrconf_verify to avoid unnecessary
1347 * temporary addresses being generated.
eac55bf9 1348 */
ecab6701
HK		 1349 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1350 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1351 in6_ifa_put(ifp);
1352 in6_dev_put(idev);
1353 ret = -1;
1354 goto out;
1355 }
1356
95c385b4
NH		 1357 addr_flags = IFA_F_TEMPORARY;
1358 /* set in addrconf_prefix_rcv() */
1359 if (ifp->flags & IFA_F_OPTIMISTIC)
1360 addr_flags |= IFA_F_OPTIMISTIC;
1361
4b08a8f1
HFS		 1362 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1363 ipv6_addr_scope(&addr), addr_flags,
fffcefe9 1364 tmp_valid_lft, tmp_prefered_lft, block, NULL);
4b08a8f1 1365 if (IS_ERR(ift)) {
1da177e4
LT		 1366 in6_ifa_put(ifp);
1367 in6_dev_put(idev);
f3213831 1368 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1369 tmpaddr = &addr;
53bd6749 1370 write_lock_bh(&idev->lock);
1da177e4
LT		 1371 goto retry;
1372 }
1373
1374 spin_lock_bh(&ift->lock);
1375 ift->ifpub = ifp;
76f793e3 1376 ift->cstamp = now;
1da177e4
LT		 1377 ift->tstamp = tmp_tstamp;
1378 spin_unlock_bh(&ift->lock);
1379
cf22f9a2 1380 addrconf_dad_start(ift);
1da177e4
LT		 1381 in6_ifa_put(ift);
1382 in6_dev_put(idev);
1383out:
1384 return ret;
1385}
1da177e4
LT		 1386
1387/*
072047e4 1388 * Choose an appropriate source address (RFC3484)
1da177e4 1389 */
a9b05723
YH		 1390enum {
1391 IPV6_SADDR_RULE_INIT = 0,
1392 IPV6_SADDR_RULE_LOCAL,
1393 IPV6_SADDR_RULE_SCOPE,
1394 IPV6_SADDR_RULE_PREFERRED,
1395#ifdef CONFIG_IPV6_MIP6
1396 IPV6_SADDR_RULE_HOA,
1397#endif
1398 IPV6_SADDR_RULE_OIF,
1399 IPV6_SADDR_RULE_LABEL,
a9b05723 1400 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1401 IPV6_SADDR_RULE_ORCHID,
1402 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1403#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1404 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1405#endif
a9b05723
YH		 1406 IPV6_SADDR_RULE_MAX
1407};
1408
072047e4 1409struct ipv6_saddr_score {
a9b05723
YH		 1410 int rule;
1411 int addr_type;
1412 struct inet6_ifaddr *ifa;
1413 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1414 int scopedist;
1415 int matchlen;
072047e4
YH		 1416};
1417
a9b05723 1418struct ipv6_saddr_dst {
9acd9f3a 1419 const struct in6_addr *addr;
a9b05723
YH		 1420 int ifindex;
1421 int scope;
1422 int label;
7cbca67c 1423 unsigned int prefs;
a9b05723 1424};
072047e4 1425
b6f99a21 1426static inline int ipv6_saddr_preferred(int type)
1da177e4 1427{
45bb0060 1428 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1429 return 1;
1430 return 0;
1da177e4
LT		 1431}
1432
35e015e1
MC		 1433static bool ipv6_use_optimistic_addr(struct net *net,
1434 struct inet6_dev *idev)
7fd2561e
EK		 1435{
1436#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 1437 if (!idev)
1438 return false;
1439 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1440 return false;
1441 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1442 return false;
1443
1444 return true;
7fd2561e
EK		 1445#else
1446 return false;
1447#endif
1448}
1449
f1c02cfb
SD		 1450static bool ipv6_allow_optimistic_dad(struct net *net,
1451 struct inet6_dev *idev)
1452{
1453#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1454 if (!idev)
1455 return false;
1456 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1457 return false;
1458
1459 return true;
1460#else
1461 return false;
1462#endif
1463}
1464
3de23255
BT		 1465static int ipv6_get_saddr_eval(struct net *net,
1466 struct ipv6_saddr_score *score,
a9b05723
YH		 1467 struct ipv6_saddr_dst *dst,
1468 int i)
1469{
1470 int ret;
1471
1472 if (i <= score->rule) {
1473 switch (i) {
1474 case IPV6_SADDR_RULE_SCOPE:
1475 ret = score->scopedist;
1476 break;
1477 case IPV6_SADDR_RULE_PREFIX:
1478 ret = score->matchlen;
1479 break;
1480 default:
1481 ret = !!test_bit(i, score->scorebits);
1482 }
1483 goto out;
1484 }
1485
1486 switch (i) {
1487 case IPV6_SADDR_RULE_INIT:
1488 /* Rule 0: remember if hiscore is not ready yet */
1489 ret = !!score->ifa;
1490 break;
1491 case IPV6_SADDR_RULE_LOCAL:
1492 /* Rule 1: Prefer same address */
1493 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1494 break;
1495 case IPV6_SADDR_RULE_SCOPE:
1496 /* Rule 2: Prefer appropriate scope
1497 *
1498 * ret
1499 * ^
1500 * -1 | d 15
1501 * ---+--+-+---> scope
1502 * |
1503 * | d is scope of the destination.
1504 * B-d | \
1505 * | \ <- smaller scope is better if
db9c7c39 1506 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1507 * | ret = B - scope (-1 <= scope >= d <= 15).
1508 * d-C-1 | /
1509 * |/ <- greater is better
1510 * -C / if scope is not enough for destination.
1511 * /| ret = scope - C (-1 <= d < scope <= 15).
1512 *
1513 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1514 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1515 * Assume B = 0 and we get C > 29.
1516 */
1517 ret = __ipv6_addr_src_scope(score->addr_type);
1518 if (ret >= dst->scope)
1519 ret = -ret;
1520 else
1521 ret -= 128; /* 30 is enough */
1522 score->scopedist = ret;
1523 break;
1524 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1525 {
a9b05723 1526 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1527 u8 avoid = IFA_F_DEPRECATED;
1528
35e015e1 1529 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
7fd2561e 1530 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1531 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1532 !(score->ifa->flags & avoid);
a9b05723 1533 break;
7fd2561e 1534 }
a9b05723
YH		 1535#ifdef CONFIG_IPV6_MIP6
1536 case IPV6_SADDR_RULE_HOA:
7cbca67c 1537 {
a9b05723 1538 /* Rule 4: Prefer home address */
7cbca67c
YH		 1539 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1540 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1541 break;
7cbca67c 1542 }
a9b05723
YH		 1543#endif
1544 case IPV6_SADDR_RULE_OIF:
1545 /* Rule 5: Prefer outgoing interface */
1546 ret = (!dst->ifindex ||
1547 dst->ifindex == score->ifa->idev->dev->ifindex);
1548 break;
1549 case IPV6_SADDR_RULE_LABEL:
1550 /* Rule 6: Prefer matching label */
3de23255
BT		 1551 ret = ipv6_addr_label(net,
1552 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1553 score->ifa->idev->dev->ifindex) == dst->label;
1554 break;
a9b05723 1555 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1556 {
a9b05723 1557 /* Rule 7: Prefer public address
25985edc 1558 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1559 */
7cbca67c
YH		 1560 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1561 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1562 score->ifa->idev->cnf.use_tempaddr >= 2;
1563 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1564 break;
7cbca67c 1565 }
a9b05723
YH		 1566 case IPV6_SADDR_RULE_ORCHID:
1567 /* Rule 8-: Prefer ORCHID vs ORCHID or
1568 * non-ORCHID vs non-ORCHID
1569 */
1570 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1571 ipv6_addr_orchid(dst->addr));
1572 break;
1573 case IPV6_SADDR_RULE_PREFIX:
1574 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1575 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1576 if (ret > score->ifa->prefix_len)
1577 ret = score->ifa->prefix_len;
1578 score->matchlen = ret;
a9b05723 1579 break;
7fd2561e
EK		 1580#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1581 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1582 /* Optimistic addresses still have lower precedence than other
1583 * preferred addresses.
1584 */
1585 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1586 break;
1587#endif
a9b05723
YH		 1588 default:
1589 ret = 0;
1590 }
1591
1592 if (ret)
1593 __set_bit(i, score->scorebits);
1594 score->rule = i;
1595out:
1596 return ret;
1597}
1598
c0b8da1e
YH		 1599static int __ipv6_dev_get_saddr(struct net *net,
1600 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1601 struct inet6_dev *idev,
1602 struct ipv6_saddr_score *scores,
1603 int hiscore_idx)
9131f3de 1604{
c0b8da1e 1605 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de 1606
f59c031e 1607 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
9131f3de
YH		 1608 int i;
1609
1610 /*
1611 * - Tentative Address (RFC2462 section 5.4)
1612 * - A tentative address is not considered
1613 * "assigned to an interface" in the traditional
1614 * sense, unless it is also flagged as optimistic.
1615 * - Candidate Source Address (section 4)
1616 * - In any case, anycast addresses, multicast
1617 * addresses, and the unspecified address MUST
1618 * NOT be included in a candidate set.
1619 */
1620 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1621 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1622 continue;
1623
1624 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1625
1626 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1627 score->addr_type & IPV6_ADDR_MULTICAST)) {
1628 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1629 idev->dev->name);
1630 continue;
1631 }
1632
1633 score->rule = -1;
1634 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1635
1636 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1637 int minihiscore, miniscore;
1638
1639 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1640 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1641
1642 if (minihiscore > miniscore) {
1643 if (i == IPV6_SADDR_RULE_SCOPE &&
1644 score->scopedist > 0) {
1645 /*
1646 * special case:
1647 * each remaining entry
1648 * has too small (not enough)
1649 * scope, because ifa entries
1650 * are sorted by their scope
1651 * values.
1652 */
1653 goto out;
1654 }
1655 break;
1656 } else if (minihiscore < miniscore) {
9131f3de 1657 swap(hiscore, score);
c0b8da1e 1658 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1659
1660 /* restore our iterator */
1661 score->ifa = hiscore->ifa;
1662
1663 break;
1664 }
1665 }
1666 }
1667out:
c0b8da1e 1668 return hiscore_idx;
9131f3de
YH		 1669}
1670
afbac601
DA		 1671static int ipv6_get_saddr_master(struct net *net,
1672 const struct net_device *dst_dev,
1673 const struct net_device *master,
1674 struct ipv6_saddr_dst *dst,
1675 struct ipv6_saddr_score *scores,
1676 int hiscore_idx)
1677{
1678 struct inet6_dev *idev;
1679
1680 idev = __in6_dev_get(dst_dev);
1681 if (idev)
1682 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1683 scores, hiscore_idx);
1684
1685 idev = __in6_dev_get(master);
1686 if (idev)
1687 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1688 scores, hiscore_idx);
1689
1690 return hiscore_idx;
1691}
1692
b3f644fc 1693int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1694 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1695 struct in6_addr *saddr)
1da177e4 1696{
c0b8da1e 1697 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1698 struct ipv6_saddr_dst dst;
9131f3de 1699 struct inet6_dev *idev;
072047e4 1700 struct net_device *dev;
a9b05723 1701 int dst_type;
9131f3de 1702 bool use_oif_addr = false;
c0b8da1e 1703 int hiscore_idx = 0;
cc429c8f 1704 int ret = 0;
1da177e4 1705
a9b05723
YH		 1706 dst_type = __ipv6_addr_type(daddr);
1707 dst.addr = daddr;
1708 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1709 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1710 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1711 dst.prefs = prefs;
a9b05723 1712
c0b8da1e
YH		 1713 scores[hiscore_idx].rule = -1;
1714 scores[hiscore_idx].ifa = NULL;
1da177e4 1715
8814c4b5 1716 rcu_read_lock();
1da177e4 1717
9131f3de
YH		 1718 /* Candidate Source Address (section 4)
1719 * - multicast and link-local destination address,
1720 * the set of candidate source address MUST only
1721 * include addresses assigned to interfaces
1722 * belonging to the same link as the outgoing
1723 * interface.
1724 * (- For site-local destination addresses, the
1725 * set of candidate source addresses MUST only
1726 * include addresses assigned to interfaces
1727 * belonging to the same site as the outgoing
1728 * interface.)
3985e8a3
EK		 1729 * - "It is RECOMMENDED that the candidate source addresses
1730 * be the set of unicast addresses assigned to the
1731 * interface that will be used to send to the destination
1732 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1733 */
1734 if (dst_dev) {
3985e8a3 1735 idev = __in6_dev_get(dst_dev);
9131f3de 1736 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1737 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1738 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1739 use_oif_addr = true;
1740 }
1741 }
a9b05723 1742
9131f3de 1743 if (use_oif_addr) {
c0b8da1e 1744 if (idev)
c15df306 1745 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de 1746 } else {
afbac601
DA		 1747 const struct net_device *master;
1748 int master_idx = 0;
1749
1750 /* if dst_dev exists and is enslaved to an L3 device, then
1751 * prefer addresses from dst_dev and then the master over
1752 * any other enslaved devices in the L3 domain.
1753 */
1754 master = l3mdev_master_dev_rcu(dst_dev);
1755 if (master) {
1756 master_idx = master->ifindex;
1757
1758 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1759 master, &dst,
1760 scores, hiscore_idx);
1761
1762 if (scores[hiscore_idx].ifa)
1763 goto out;
1764 }
1765
9131f3de 1766 for_each_netdev_rcu(net, dev) {
afbac601
DA		 1767 /* only consider addresses on devices in the
1768 * same L3 domain
1769 */
1770 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1771 continue;
9131f3de
YH		 1772 idev = __in6_dev_get(dev);
1773 if (!idev)
072047e4 1774 continue;
c15df306 1775 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1776 }
1777 }
afbac601
DA		 1778
1779out:
c0b8da1e 1780 hiscore = &scores[hiscore_idx];
a9b05723 1781 if (!hiscore->ifa)
cc429c8f
ED		 1782 ret = -EADDRNOTAVAIL;
1783 else
1784 *saddr = hiscore->ifa->addr;
1ab1457c 1785
cc429c8f
ED		 1786 rcu_read_unlock();
1787 return ret;
1da177e4 1788}
5e5f3f0f 1789EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1790
8965779d 1791int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1792 u32 banned_flags)
b7b1bfce
HFS		 1793{
1794 struct inet6_ifaddr *ifp;
1795 int err = -EADDRNOTAVAIL;
1796
602582ca
HFS		 1797 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1798 if (ifp->scope > IFA_LINK)
1799 break;
b7b1bfce
HFS		 1800 if (ifp->scope == IFA_LINK &&
1801 !(ifp->flags & banned_flags)) {
1802 *addr = ifp->addr;
1803 err = 0;
1804 break;
1805 }
1806 }
1807 return err;
1808}
1809
95c385b4 1810int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1811 u32 banned_flags)
1da177e4
LT		 1812{
1813 struct inet6_dev *idev;
1814 int err = -EADDRNOTAVAIL;
1815
8814c4b5 1816 rcu_read_lock();
e21e8467
SH		 1817 idev = __in6_dev_get(dev);
1818 if (idev) {
1da177e4 1819 read_lock_bh(&idev->lock);
b7b1bfce 1820 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1821 read_unlock_bh(&idev->lock);
1822 }
8814c4b5 1823 rcu_read_unlock();
1da177e4
LT		 1824 return err;
1825}
1826
d9bf82c2 1827static int ipv6_count_addresses(const struct inet6_dev *idev)
1da177e4 1828{
d9bf82c2 1829 const struct inet6_ifaddr *ifp;
1da177e4 1830 int cnt = 0;
1da177e4 1831
d9bf82c2
ED		 1832 rcu_read_lock();
1833 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1da177e4 1834 cnt++;
d9bf82c2 1835 rcu_read_unlock();
1da177e4
LT		 1836 return cnt;
1837}
1838
b71d1d42 1839int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1840 const struct net_device *dev, int strict)
c58da4c6 1841{
232378e8
DA		 1842 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1843 strict, IFA_F_TENTATIVE);
c58da4c6
EK		 1844}
1845EXPORT_SYMBOL(ipv6_chk_addr);
1846
1893ff20
DA		 1847/* device argument is used to find the L3 domain of interest. If
1848 * skip_dev_check is set, then the ifp device is not checked against
1849 * the passed in dev argument. So the 2 cases for addresses checks are:
1850 * 1. does the address exist in the L3 domain that dev is part of
1851 * (skip_dev_check = true), or
1852 *
1853 * 2. does the address exist on the specific device
1854 * (skip_dev_check = false)
1855 */
c58da4c6 1856int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
232378e8
DA		 1857 const struct net_device *dev, bool skip_dev_check,
1858 int strict, u32 banned_flags)
1da177e4 1859{
3f27fb23 1860 unsigned int hash = inet6_addr_hash(net, addr);
1893ff20 1861 const struct net_device *l3mdev;
eedf042a 1862 struct inet6_ifaddr *ifp;
c58da4c6 1863 u32 ifp_flags;
1da177e4 1864
480318a0 1865 rcu_read_lock();
232378e8 1866
1893ff20 1867 l3mdev = l3mdev_master_dev_rcu(dev);
232378e8
DA		 1868 if (skip_dev_check)
1869 dev = NULL;
1870
b67bfe0d 1871 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1872 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1873 continue;
1893ff20
DA		 1874
1875 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev)
1876 continue;
1877
c58da4c6
EK		 1878 /* Decouple optimistic from tentative for evaluation here.
1879 * Ban optimistic addresses explicitly, when required.
1880 */
1881 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1882 ? (ifp->flags&~IFA_F_TENTATIVE)
1883 : ifp->flags;
1da177e4 1884 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1885 !(ifp_flags&banned_flags) &&
63159f29 1886 (!dev || ifp->idev->dev == dev ||
eedf042a 1887 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
480318a0 1888 rcu_read_unlock();
eedf042a 1889 return 1;
1da177e4
LT		 1890 }
1891 }
5c578aed 1892
480318a0 1893 rcu_read_unlock();
eedf042a 1894 return 0;
1da177e4 1895}
c58da4c6 1896EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1897
1da177e4 1898
7df37ff3
CB		 1899/* Compares an address/prefix_len with addresses on device @dev.
1900 * If one is found it returns true.
1901 */
1902bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1903 const unsigned int prefix_len, struct net_device *dev)
1904{
47e26941
ED		 1905 const struct inet6_ifaddr *ifa;
1906 const struct inet6_dev *idev;
7df37ff3
CB		 1907 bool ret = false;
1908
1909 rcu_read_lock();
1910 idev = __in6_dev_get(dev);
1911 if (idev) {
47e26941 1912 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
7df37ff3
CB		 1913 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1914 if (ret)
1915 break;
1916 }
7df37ff3
CB		 1917 }
1918 rcu_read_unlock();
1919
1920 return ret;
1921}
1922EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1923
b71d1d42 1924int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84 1925{
24ba333b
ED		 1926 const struct inet6_ifaddr *ifa;
1927 const struct inet6_dev *idev;
52eeeb84
YH		 1928 int onlink;
1929
1930 onlink = 0;
1931 rcu_read_lock();
1932 idev = __in6_dev_get(dev);
1933 if (idev) {
24ba333b 1934 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1935 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1936 ifa->prefix_len);
1937 if (onlink)
1938 break;
1939 }
52eeeb84
YH		 1940 }
1941 rcu_read_unlock();
1942 return onlink;
1943}
52eeeb84
YH		 1944EXPORT_SYMBOL(ipv6_chk_prefix);
1945
9acd9f3a 1946struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1947 struct net_device *dev, int strict)
1da177e4 1948{
3f27fb23 1949 unsigned int hash = inet6_addr_hash(net, addr);
b79d1d54 1950 struct inet6_ifaddr *ifp, *result = NULL;
1da177e4 1951
24f226da
ED		 1952 rcu_read_lock();
1953 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1954 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1955 continue;
1da177e4 1956 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1957 if (!dev || ifp->idev->dev == dev ||
1da177e4 1958 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1959 result = ifp;
1da177e4
LT		 1960 in6_ifa_hold(ifp);
1961 break;
1962 }
1963 }
1964 }
24f226da 1965 rcu_read_unlock();
1da177e4 1966
b79d1d54 1967 return result;
1da177e4
LT		 1968}
1969
1da177e4
LT		 1970/* Gets referenced address, destroys ifaddr */
1971
cc411d0b 1972static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1973{
3d171f39
LR		 1974 if (dad_failed)
1975 ifp->flags |= IFA_F_DADFAILED;
1976
ec8add2a 1977 if (ifp->flags&IFA_F_TEMPORARY) {
1da177e4
LT		 1978 struct inet6_ifaddr *ifpub;
1979 spin_lock_bh(&ifp->lock);
1980 ifpub = ifp->ifpub;
1981 if (ifpub) {
1982 in6_ifa_hold(ifpub);
1983 spin_unlock_bh(&ifp->lock);
fffcefe9 1984 ipv6_create_tempaddr(ifpub, ifp, true);
1da177e4
LT		 1985 in6_ifa_put(ifpub);
1986 } else {
1987 spin_unlock_bh(&ifp->lock);
1988 }
1989 ipv6_del_addr(ifp);
ec8add2a
SD		 1990 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
1991 spin_lock_bh(&ifp->lock);
1992 addrconf_del_dad_work(ifp);
1993 ifp->flags |= IFA_F_TENTATIVE;
f1c02cfb
SD		 1994 if (dad_failed)
1995 ifp->flags &= ~IFA_F_OPTIMISTIC;
ec8add2a
SD		 1996 spin_unlock_bh(&ifp->lock);
1997 if (dad_failed)
1998 ipv6_ifa_notify(0, ifp);
1999 in6_ifa_put(ifp);
c15b1cca 2000 } else {
1da177e4 2001 ipv6_del_addr(ifp);
c15b1cca 2002 }
1da177e4
LT		 2003}
2004
f2344a13
HX		 2005static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2006{
2007 int err = -ENOENT;
2008
8e8e676d 2009 spin_lock_bh(&ifp->lock);
f2344a13
HX		 2010 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2011 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2012 err = 0;
2013 }
8e8e676d 2014 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 2015
2016 return err;
2017}
2018
da13c59b 2019void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
3c21edbd 2020{
1b34be74 2021 struct inet6_dev *idev = ifp->idev;
1855b7c3 2022 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 2023
853dc2e0
UB		 2024 if (addrconf_dad_end(ifp)) {
2025 in6_ifa_put(ifp);
f2344a13 2026 return;
853dc2e0 2027 }
f2344a13 2028
da13c59b
VP		 2029 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2030 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
9bdd8d40 2031
5f40ef77
HFS		 2032 spin_lock_bh(&ifp->lock);
2033
2034 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2035 int scope = ifp->scope;
2036 u32 flags = ifp->flags;
2037 struct in6_addr new_addr;
2038 struct inet6_ifaddr *ifp2;
2039 u32 valid_lft, preferred_lft;
2040 int pfxlen = ifp->prefix_len;
5f40ef77
HFS		 2041 int retries = ifp->stable_privacy_retry + 1;
2042
1855b7c3 2043 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 2044 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2045 ifp->idev->dev->name);
2046 goto errdad;
2047 }
2048
2049 new_addr = ifp->addr;
2050 if (ipv6_generate_stable_address(&new_addr, retries,
2051 idev))
2052 goto errdad;
2053
2054 valid_lft = ifp->valid_lft;
2055 preferred_lft = ifp->prefered_lft;
2056
2057 spin_unlock_bh(&ifp->lock);
1b34be74 2058
5f40ef77
HFS		 2059 if (idev->cnf.max_addresses &&
2060 ipv6_count_addresses(idev) >=
2061 idev->cnf.max_addresses)
2062 goto lock_errdad;
2063
2064 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2065 ifp->idev->dev->name);
2066
2067 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
2068 scope, flags, valid_lft,
de95e047 2069 preferred_lft, false, NULL);
5f40ef77
HFS		 2070 if (IS_ERR(ifp2))
2071 goto lock_errdad;
2072
2073 spin_lock_bh(&ifp2->lock);
2074 ifp2->stable_privacy_retry = retries;
2075 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2076 spin_unlock_bh(&ifp2->lock);
2077
1855b7c3 2078 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 2079 in6_ifa_put(ifp2);
2080lock_errdad:
2081 spin_lock_bh(&ifp->lock);
1b34be74
YH		 2082 }
2083
5f40ef77 2084errdad:
c15b1cca
HFS		 2085 /* transition from _POSTDAD to _ERRDAD */
2086 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 2087 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 2088
2089 addrconf_mod_dad_work(ifp, 0);
751eb6b6 2090 in6_ifa_put(ifp);
3c21edbd 2091}
1da177e4 2092
a9ed4a29
SD		 2093/* Join to solicited addr multicast group.
2094 * caller must hold RTNL */
b71d1d42 2095void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 2096{
2097 struct in6_addr maddr;
2098
2099 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2100 return;
2101
2102 addrconf_addr_solict_mult(addr, &maddr);
2103 ipv6_dev_mc_inc(dev, &maddr);
2104}
2105
a9ed4a29 2106/* caller must hold RTNL */
b71d1d42 2107void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 2108{
2109 struct in6_addr maddr;
2110
2111 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2112 return;
2113
2114 addrconf_addr_solict_mult(addr, &maddr);
2115 __ipv6_dev_mc_dec(idev, &maddr);
2116}
2117
a9ed4a29 2118/* caller must hold RTNL */
20380731 2119static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2120{
2121 struct in6_addr addr;
c15b1cca 2122
88ad3149 2123 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 2124 return;
1da177e4
LT		 2125 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2126 if (ipv6_addr_any(&addr))
2127 return;
013b4d90 2128 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 2129}
2130
a9ed4a29 2131/* caller must hold RTNL */
20380731 2132static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2133{
2134 struct in6_addr addr;
c15b1cca 2135
88ad3149 2136 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 2137 return;
1da177e4
LT		 2138 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2139 if (ipv6_addr_any(&addr))
2140 return;
2141 __ipv6_dev_ac_dec(ifp->idev, &addr);
2142}
2143
8a7a4b47 2144static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
06a4c1c5 2145{
8a7a4b47
AA		 2146 switch (dev->addr_len) {
2147 case ETH_ALEN:
9dae2e03
LAD		 2148 memcpy(eui, dev->dev_addr, 3);
2149 eui[3] = 0xFF;
2150 eui[4] = 0xFE;
2151 memcpy(eui + 5, dev->dev_addr + 3, 3);
2152 break;
8a7a4b47
AA		 2153 case EUI64_ADDR_LEN:
2154 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2155 eui[0] ^= 2;
2156 break;
2157 default:
06a4c1c5 2158 return -1;
8a7a4b47
AA		 2159 }
2160
06a4c1c5 2161 return 0;
2162}
2163
cb6bf355
YH		 2164static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2165{
2166 union fwnet_hwaddr *ha;
2167
2168 if (dev->addr_len != FWNET_ALEN)
2169 return -1;
2170
2171 ha = (union fwnet_hwaddr *)dev->dev_addr;
2172
2173 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2174 eui[0] ^= 2;
2175 return 0;
2176}
2177
073a8e0e
YH		 2178static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2179{
2180 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2181 if (dev->addr_len != ARCNET_ALEN)
2182 return -1;
2183 memset(eui, 0, 7);
8e5e8f30 2184 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 2185 return 0;
2186}
2187
2188static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2189{
2190 if (dev->addr_len != INFINIBAND_ALEN)
2191 return -1;
2192 memcpy(eui, dev->dev_addr + 12, 8);
2193 eui[0] |= 2;
2194 return 0;
2195}
2196
c61393ea 2197static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2198{
9af28511
SH		 2199 if (addr == 0)
2200 return -1;
dfd982ba
YH		 2201 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2202 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2203 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2204 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2205 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2206 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2207 eui[1] = 0;
2208 eui[2] = 0x5E;
2209 eui[3] = 0xFE;
2210 memcpy(eui + 4, &addr, 4);
2211 return 0;
2212}
dfd982ba
YH		 2213
2214static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2215{
2216 if (dev->priv_flags & IFF_ISATAP)
2217 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2218 return -1;
2219}
2220
aee80b54 2221static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2222{
2223 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2224}
2225
e837735e
ND		 2226static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2227{
2228 memcpy(eui, dev->perm_addr, 3);
2229 memcpy(eui + 5, dev->perm_addr + 3, 3);
2230 eui[3] = 0xFF;
2231 eui[4] = 0xFE;
2232 eui[0] ^= 2;
2233 return 0;
2234}
2235
1da177e4
LT		 2236static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2237{
2238 switch (dev->type) {
2239 case ARPHRD_ETHER:
2240 case ARPHRD_FDDI:
073a8e0e 2241 return addrconf_ifid_eui48(eui, dev);
1da177e4 2242 case ARPHRD_ARCNET:
073a8e0e 2243 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2244 case ARPHRD_INFINIBAND:
073a8e0e 2245 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2246 case ARPHRD_SIT:
dfd982ba 2247 return addrconf_ifid_sit(eui, dev);
aee80b54 2248 case ARPHRD_IPGRE:
45ce0fd1 2249 case ARPHRD_TUNNEL:
aee80b54 2250 return addrconf_ifid_gre(eui, dev);
e74bccb8 2251 case ARPHRD_6LOWPAN:
8a7a4b47 2252 return addrconf_ifid_6lowpan(eui, dev);
cb6bf355
YH		 2253 case ARPHRD_IEEE1394:
2254 return addrconf_ifid_ieee1394(eui, dev);
e837735e 2255 case ARPHRD_TUNNEL6:
45ce0fd1 2256 case ARPHRD_IP6GRE:
e837735e 2257 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2258 }
2259 return -1;
2260}
2261
2262static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2263{
2264 int err = -1;
2265 struct inet6_ifaddr *ifp;
2266
2267 read_lock_bh(&idev->lock);
602582ca
HFS		 2268 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2269 if (ifp->scope > IFA_LINK)
2270 break;
1da177e4
LT		 2271 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2272 memcpy(eui, ifp->addr.s6_addr+8, 8);
2273 err = 0;
2274 break;
2275 }
2276 }
2277 read_unlock_bh(&idev->lock);
2278 return err;
2279}
2280
1da177e4 2281/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
9d6280da 2282static void ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2283{
1da177e4 2284regen:
955189ef 2285 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2286 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2287
2288 /*
2289 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2290 * check if generated address is not inappropriate
2291 *
2292 * - Reserved subnet anycast (RFC 2526)
2293 * 11111101 11....11 1xxxxxxx
c7dc89c0 2294 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2295 * 00-00-5E-FE-xx-xx-xx-xx
2296 * - value 0
2297 * - XXX: already assigned to an address on the device
2298 */
1ab1457c 2299 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2300 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2301 (idev->rndid[7]&0x80))
2302 goto regen;
2303 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2304 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2305 goto regen;
2306 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2307 goto regen;
2308 }
1da177e4
LT		 2309}
2310
9d6280da 2311static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2312{
1da177e4 2313 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
9d6280da 2314 ipv6_regen_rndid(idev);
1da177e4 2315}
1da177e4
LT		 2316
2317/*
2318 * Add prefix route.
2319 */
2320
2321static void
2322addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2323 unsigned long expires, u32 flags)
1da177e4 2324{
86872cb5 2325 struct fib6_config cfg = {
ca254490 2326 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
86872cb5
TG		 2327 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2328 .fc_ifindex = dev->ifindex,
2329 .fc_expires = expires,
2330 .fc_dst_len = plen,
2331 .fc_flags = RTF_UP | flags,
c346dca1 2332 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2333 .fc_protocol = RTPROT_KERNEL,
86872cb5 2334 };
1da177e4 2335
4e3fd7a0 2336 cfg.fc_dst = *pfx;
1da177e4
LT		 2337
2338 /* Prevent useless cloning on PtP SIT.
2339 This thing is done here expecting that the whole
2340 class of non-broadcast devices need not cloning.
2341 */
07a93626 2342#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2343 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2344 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2345#endif
1da177e4 2346
333c4301 2347 ip6_route_add(&cfg, NULL);
1da177e4
LT		 2348}
2349
14ef37b6
AH		 2350
2351static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2352 int plen,
2353 const struct net_device *dev,
2354 u32 flags, u32 noflags)
2355{
2356 struct fib6_node *fn;
2357 struct rt6_info *rt = NULL;
2358 struct fib6_table *table;
ca254490 2359 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2360
ca254490 2361 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2362 if (!table)
14ef37b6
AH		 2363 return NULL;
2364
66f5d6ce 2365 rcu_read_lock();
38fbeeee 2366 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
14ef37b6
AH		 2367 if (!fn)
2368 goto out;
1f56a01f 2369
66f5d6ce 2370 for_each_fib6_node_rt_rcu(fn) {
d1918542 2371 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2372 continue;
2373 if ((rt->rt6i_flags & flags) != flags)
2374 continue;
85da53bf 2375 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6 2376 continue;
d3843fe5
WW		 2377 if (!dst_hold_safe(&rt->dst))
2378 rt = NULL;
14ef37b6
AH		 2379 break;
2380 }
2381out:
66f5d6ce 2382 rcu_read_unlock();
14ef37b6
AH		 2383 return rt;
2384}
2385
2386
1da177e4
LT		 2387/* Create "default" multicast route to the interface */
2388
2389static void addrconf_add_mroute(struct net_device *dev)
2390{
86872cb5 2391 struct fib6_config cfg = {
ca254490 2392 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2393 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2394 .fc_ifindex = dev->ifindex,
2395 .fc_dst_len = 8,
2396 .fc_flags = RTF_UP,
c346dca1 2397 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2398 };
2399
2400 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2401
333c4301 2402 ip6_route_add(&cfg, NULL);
1da177e4
LT		 2403}
2404
1da177e4
LT		 2405static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2406{
2407 struct inet6_dev *idev;
2408
2409 ASSERT_RTNL();
2410
e21e8467
SH		 2411 idev = ipv6_find_idev(dev);
2412 if (!idev)
64e724f6
BH		 2413 return ERR_PTR(-ENOBUFS);
2414
2415 if (idev->cnf.disable_ipv6)
2416 return ERR_PTR(-EACCES);
1da177e4
LT		 2417
2418 /* Add default multicast route */
ba46ee4c 2419 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
4af04aba 2420 addrconf_add_mroute(dev);
1da177e4 2421
1da177e4
LT		 2422 return idev;
2423}
2424
53bd6749
JP		 2425static void manage_tempaddrs(struct inet6_dev *idev,
2426 struct inet6_ifaddr *ifp,
2427 __u32 valid_lft, __u32 prefered_lft,
2428 bool create, unsigned long now)
2429{
2430 u32 flags;
2431 struct inet6_ifaddr *ift;
2432
2433 read_lock_bh(&idev->lock);
2434 /* update all temporary addresses in the list */
2435 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2436 int age, max_valid, max_prefered;
2437
2438 if (ifp != ift->ifpub)
2439 continue;
2440
2441 /* RFC 4941 section 3.3:
2442 * If a received option will extend the lifetime of a public
2443 * address, the lifetimes of temporary addresses should
2444 * be extended, subject to the overall constraint that no
2445 * temporary addresses should ever remain "valid" or "preferred"
2446 * for a time longer than (TEMP_VALID_LIFETIME) or
2447 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2448 */
2449 age = (now - ift->cstamp) / HZ;
2450 max_valid = idev->cnf.temp_valid_lft - age;
2451 if (max_valid < 0)
2452 max_valid = 0;
2453
2454 max_prefered = idev->cnf.temp_prefered_lft -
76506a98 2455 idev->desync_factor - age;
53bd6749
JP		 2456 if (max_prefered < 0)
2457 max_prefered = 0;
2458
2459 if (valid_lft > max_valid)
2460 valid_lft = max_valid;
2461
2462 if (prefered_lft > max_prefered)
2463 prefered_lft = max_prefered;
2464
2465 spin_lock(&ift->lock);
2466 flags = ift->flags;
2467 ift->valid_lft = valid_lft;
2468 ift->prefered_lft = prefered_lft;
2469 ift->tstamp = now;
2470 if (prefered_lft > 0)
2471 ift->flags &= ~IFA_F_DEPRECATED;
2472
2473 spin_unlock(&ift->lock);
2474 if (!(flags&IFA_F_TENTATIVE))
2475 ipv6_ifa_notify(0, ift);
2476 }
2477
2478 if ((create || list_empty(&idev->tempaddr_list)) &&
2479 idev->cnf.use_tempaddr > 0) {
2480 /* When a new public address is created as described
2481 * in [ADDRCONF], also create a new temporary address.
2482 * Also create a temporary address if it's enabled but
2483 * no temporary address currently exists.
2484 */
2485 read_unlock_bh(&idev->lock);
fffcefe9 2486 ipv6_create_tempaddr(ifp, NULL, false);
53bd6749
JP		 2487 } else {
2488 read_unlock_bh(&idev->lock);
2489 }
2490}
2491
cc9da6cc
BM		 2492static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2493{
d35a00b8
FJ		 2494 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2495 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc
BM		 2496}
2497
cc84b3c6
AA		 2498int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2499 const struct prefix_info *pinfo,
2500 struct inet6_dev *in6_dev,
2501 const struct in6_addr *addr, int addr_type,
2502 u32 addr_flags, bool sllao, bool tokenized,
2503 __u32 valid_lft, u32 prefered_lft)
4f672235
AA		 2504{
2505 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2506 int create = 0, update_lft = 0;
2507
2508 if (!ifp && valid_lft) {
2509 int max_addresses = in6_dev->cnf.max_addresses;
2510
2511#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 2512 if ((net->ipv6.devconf_all->optimistic_dad ||
2513 in6_dev->cnf.optimistic_dad) &&
4f672235
AA		 2514 !net->ipv6.devconf_all->forwarding && sllao)
2515 addr_flags |= IFA_F_OPTIMISTIC;
2516#endif
2517
2518 /* Do not allow to create too much of autoconfigured
2519 * addresses; this would be too easy way to crash kernel.
2520 */
2521 if (!max_addresses ||
2522 ipv6_count_addresses(in6_dev) < max_addresses)
2523 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2524 pinfo->prefix_len,
2525 addr_type&IPV6_ADDR_SCOPE_MASK,
2526 addr_flags, valid_lft,
de95e047 2527 prefered_lft, false, NULL);
4f672235
AA		 2528
2529 if (IS_ERR_OR_NULL(ifp))
2530 return -1;
2531
2532 update_lft = 0;
2533 create = 1;
2534 spin_lock_bh(&ifp->lock);
2535 ifp->flags |= IFA_F_MANAGETEMPADDR;
2536 ifp->cstamp = jiffies;
2537 ifp->tokenized = tokenized;
2538 spin_unlock_bh(&ifp->lock);
2539 addrconf_dad_start(ifp);
2540 }
2541
2542 if (ifp) {
2543 u32 flags;
2544 unsigned long now;
2545 u32 stored_lft;
2546
2547 /* update lifetime (RFC2462 5.5.3 e) */
2548 spin_lock_bh(&ifp->lock);
2549 now = jiffies;
2550 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2551 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2552 else
2553 stored_lft = 0;
2554 if (!update_lft && !create && stored_lft) {
2555 const u32 minimum_lft = min_t(u32,
2556 stored_lft, MIN_VALID_LIFETIME);
2557 valid_lft = max(valid_lft, minimum_lft);
2558
2559 /* RFC4862 Section 5.5.3e:
2560 * "Note that the preferred lifetime of the
2561 * corresponding address is always reset to
2562 * the Preferred Lifetime in the received
2563 * Prefix Information option, regardless of
2564 * whether the valid lifetime is also reset or
2565 * ignored."
2566 *
2567 * So we should always update prefered_lft here.
2568 */
2569 update_lft = 1;
2570 }
2571
2572 if (update_lft) {
2573 ifp->valid_lft = valid_lft;
2574 ifp->prefered_lft = prefered_lft;
2575 ifp->tstamp = now;
2576 flags = ifp->flags;
2577 ifp->flags &= ~IFA_F_DEPRECATED;
2578 spin_unlock_bh(&ifp->lock);
2579
2580 if (!(flags&IFA_F_TENTATIVE))
2581 ipv6_ifa_notify(0, ifp);
2582 } else
2583 spin_unlock_bh(&ifp->lock);
2584
2585 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2586 create, now);
2587
2588 in6_ifa_put(ifp);
2589 addrconf_verify();
2590 }
2591
2592 return 0;
2593}
cc84b3c6 2594EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
4f672235 2595
e6bff995 2596void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2597{
2598 struct prefix_info *pinfo;
2599 __u32 valid_lft;
2600 __u32 prefered_lft;
4f672235 2601 int addr_type, err;
64236f3f 2602 u32 addr_flags = 0;
1da177e4 2603 struct inet6_dev *in6_dev;
56d417b1 2604 struct net *net = dev_net(dev);
1da177e4
LT		 2605
2606 pinfo = (struct prefix_info *) opt;
1ab1457c 2607
1da177e4 2608 if (len < sizeof(struct prefix_info)) {
e32ac250 2609 netdev_dbg(dev, "addrconf: prefix option too short\n");
1da177e4
LT		 2610 return;
2611 }
1ab1457c 2612
1da177e4
LT		 2613 /*
2614 * Validation checks ([ADDRCONF], page 19)
2615 */
2616
2617 addr_type = ipv6_addr_type(&pinfo->prefix);
2618
2619 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2620 return;
2621
2622 valid_lft = ntohl(pinfo->valid);
2623 prefered_lft = ntohl(pinfo->prefered);
2624
2625 if (prefered_lft > valid_lft) {
e87cc472 2626 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2627 return;
2628 }
2629
2630 in6_dev = in6_dev_get(dev);
2631
63159f29 2632 if (!in6_dev) {
e87cc472
JP		 2633 net_dbg_ratelimited("addrconf: device %s not configured\n",
2634 dev->name);
1da177e4
LT		 2635 return;
2636 }
2637
2638 /*
2639 * Two things going on here:
2640 * 1) Add routes for on-link prefixes
2641 * 2) Configure prefixes with the auto flag set
2642 */
2643
4bed72e4
YH		 2644 if (pinfo->onlink) {
2645 struct rt6_info *rt;
2646 unsigned long rt_expires;
2647
6f704992
YH		 2648 /* Avoid arithmetic overflow. Really, we could
2649 * save rt_expires in seconds, likely valid_lft,
2650 * but it would require division in fib gc, that it
2651 * not good.
2652 */
4bed72e4
YH		 2653 if (HZ > USER_HZ)
2654 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2655 else
2656 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2657
4bed72e4
YH		 2658 if (addrconf_finite_timeout(rt_expires))
2659 rt_expires *= HZ;
1da177e4 2660
14ef37b6
AH		 2661 rt = addrconf_get_prefix_route(&pinfo->prefix,
2662 pinfo->prefix_len,
2663 dev,
2664 RTF_ADDRCONF | RTF_PREFIX_RT,
2665 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2666
14ef37b6 2667 if (rt) {
6f704992
YH		 2668 /* Autoconf prefix route */
2669 if (valid_lft == 0) {
2670 ip6_del_rt(rt);
2671 rt = NULL;
4bed72e4 2672 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2673 /* not infinity */
1716a961 2674 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2675 } else {
1716a961 2676 rt6_clean_expires(rt);
1da177e4
LT		 2677 }
2678 } else if (valid_lft) {
6f704992 2679 clock_t expires = 0;
4bed72e4
YH		 2680 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2681 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2682 /* not infinity */
2683 flags |= RTF_EXPIRES;
2684 expires = jiffies_to_clock_t(rt_expires);
2685 }
1da177e4 2686 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2687 dev, expires, flags);
1da177e4 2688 }
94e187c0 2689 ip6_rt_put(rt);
1da177e4
LT		 2690 }
2691
2692 /* Try to figure out our local address for this prefix */
2693
2694 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1da177e4 2695 struct in6_addr addr;
f997c55c 2696 bool tokenized = false, dev_addr_generated = false;
1da177e4
LT		 2697
2698 if (pinfo->prefix_len == 64) {
2699 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2700
2701 if (!ipv6_addr_any(&in6_dev->token)) {
2702 read_lock_bh(&in6_dev->lock);
2703 memcpy(addr.s6_addr + 8,
2704 in6_dev->token.s6_addr + 8, 8);
2705 read_unlock_bh(&in6_dev->lock);
617fe29d 2706 tokenized = true;
cc9da6cc 2707 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2708 !ipv6_generate_stable_address(&addr, 0,
2709 in6_dev)) {
64236f3f 2710 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2711 goto ok;
f53adae4
DB		 2712 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2713 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
4f672235 2714 goto put;
f997c55c
AA		 2715 } else {
2716 dev_addr_generated = true;
1da177e4
LT		 2717 }
2718 goto ok;
2719 }
e87cc472
JP		 2720 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2721 pinfo->prefix_len);
4f672235 2722 goto put;
1da177e4
LT		 2723
2724ok:
4f672235
AA		 2725 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2726 &addr, addr_type,
2727 addr_flags, sllao,
2728 tokenized, valid_lft,
2729 prefered_lft);
2730 if (err)
2731 goto put;
f997c55c
AA		 2732
2733 /* Ignore error case here because previous prefix add addr was
2734 * successful which will be notified.
2735 */
2736 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2737 addr_type, addr_flags, sllao,
2738 tokenized, valid_lft,
2739 prefered_lft,
2740 dev_addr_generated);
1da177e4
LT		 2741 }
2742 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
4f672235 2743put:
1da177e4
LT		 2744 in6_dev_put(in6_dev);
2745}
2746
2747/*
2748 * Set destination address.
2749 * Special case for SIT interfaces where we create a new "virtual"
2750 * device.
2751 */
af284937 2752int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2753{
2754 struct in6_ifreq ireq;
2755 struct net_device *dev;
2756 int err = -EINVAL;
2757
2758 rtnl_lock();
2759
2760 err = -EFAULT;
2761 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2762 goto err_exit;
2763
af284937 2764 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2765
2766 err = -ENODEV;
63159f29 2767 if (!dev)
1da177e4
LT		 2768 goto err_exit;
2769
07a93626 2770#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2771 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2772 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2773 struct ifreq ifr;
1da177e4
LT		 2774 struct ip_tunnel_parm p;
2775
2776 err = -EADDRNOTAVAIL;
2777 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2778 goto err_exit;
2779
2780 memset(&p, 0, sizeof(p));
2781 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2782 p.iph.saddr = 0;
2783 p.iph.version = 4;
2784 p.iph.ihl = 5;
2785 p.iph.protocol = IPPROTO_IPV6;
2786 p.iph.ttl = 64;
d20b3109 2787 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2788
5bc3eb7e
SH		 2789 if (ops->ndo_do_ioctl) {
2790 mm_segment_t oldfs = get_fs();
2791
2792 set_fs(KERNEL_DS);
2793 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2794 set_fs(oldfs);
2795 } else
2796 err = -EOPNOTSUPP;
1da177e4
LT		 2797
2798 if (err == 0) {
2799 err = -ENOBUFS;
af284937
DL		 2800 dev = __dev_get_by_name(net, p.name);
2801 if (!dev)
1da177e4
LT		 2802 goto err_exit;
2803 err = dev_open(dev);
2804 }
2805 }
0be669bb 2806#endif
1da177e4
LT		 2807
2808err_exit:
2809 rtnl_unlock();
2810 return err;
2811}
2812
93a714d6
MC		 2813static int ipv6_mc_config(struct sock *sk, bool join,
2814 const struct in6_addr *addr, int ifindex)
2815{
2816 int ret;
2817
2818 ASSERT_RTNL();
2819
2820 lock_sock(sk);
2821 if (join)
54ff9ef3 2822 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2823 else
54ff9ef3 2824 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2825 release_sock(sk);
2826
2827 return ret;
2828}
2829
1da177e4
LT		 2830/*
2831 * Manual configuration of address on an interface
2832 */
479840ff
JP		 2833static int inet6_addr_add(struct net *net, int ifindex,
2834 const struct in6_addr *pfx,
caeaba79 2835 const struct in6_addr *peer_pfx,
479840ff 2836 unsigned int plen, __u32 ifa_flags,
de95e047
DA		 2837 __u32 prefered_lft, __u32 valid_lft,
2838 struct netlink_ext_ack *extack)
1da177e4
LT		 2839{
2840 struct inet6_ifaddr *ifp;
2841 struct inet6_dev *idev;
2842 struct net_device *dev;
93a714d6
MC		 2843 unsigned long timeout;
2844 clock_t expires;
1da177e4 2845 int scope;
6f704992 2846 u32 flags;
1da177e4
LT		 2847
2848 ASSERT_RTNL();
1ab1457c 2849
24ef0da7
TG		 2850 if (plen > 128)
2851 return -EINVAL;
2852
0778769d
NT		 2853 /* check the lifetime */
2854 if (!valid_lft || prefered_lft > valid_lft)
2855 return -EINVAL;
2856
53bd6749
JP		 2857 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2858 return -EINVAL;
2859
af284937
DL		 2860 dev = __dev_get_by_index(net, ifindex);
2861 if (!dev)
1da177e4 2862 return -ENODEV;
1ab1457c 2863
64e724f6
BH		 2864 idev = addrconf_add_dev(dev);
2865 if (IS_ERR(idev))
2866 return PTR_ERR(idev);
1da177e4 2867
93a714d6
MC		 2868 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2869 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2870 true, pfx, ifindex);
2871
2872 if (ret < 0)
2873 return ret;
2874 }
2875
1da177e4
LT		 2876 scope = ipv6_addr_scope(pfx);
2877
4bed72e4
YH		 2878 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2879 if (addrconf_finite_timeout(timeout)) {
2880 expires = jiffies_to_clock_t(timeout * HZ);
2881 valid_lft = timeout;
6f704992 2882 flags = RTF_EXPIRES;
4bed72e4
YH		 2883 } else {
2884 expires = 0;
2885 flags = 0;
2886 ifa_flags |= IFA_F_PERMANENT;
6f704992 2887 }
0778769d 2888
4bed72e4
YH		 2889 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2890 if (addrconf_finite_timeout(timeout)) {
2891 if (timeout == 0)
2892 ifa_flags |= IFA_F_DEPRECATED;
2893 prefered_lft = timeout;
2894 }
0778769d 2895
8a226b2c 2896 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
de95e047 2897 valid_lft, prefered_lft, true, extack);
0778769d 2898
1da177e4 2899 if (!IS_ERR(ifp)) {
761aac73
TH		 2900 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2901 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2902 expires, flags);
2903 }
2904
95c385b4
NH		 2905 /*
2906 * Note that section 3.1 of RFC 4429 indicates
2907 * that the Optimistic flag should not be set for
2908 * manually configured addresses
2909 */
cf22f9a2 2910 addrconf_dad_start(ifp);
53bd6749
JP		 2911 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2912 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2913 true, jiffies);
1da177e4 2914 in6_ifa_put(ifp);
c15b1cca 2915 addrconf_verify_rtnl();
1da177e4 2916 return 0;
93a714d6
MC		 2917 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2918 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2919 false, pfx, ifindex);
1da177e4
LT		 2920 }
2921
2922 return PTR_ERR(ifp);
2923}
2924
6046d5b4
HK		 2925static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2926 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2927{
2928 struct inet6_ifaddr *ifp;
2929 struct inet6_dev *idev;
2930 struct net_device *dev;
1ab1457c 2931
24ef0da7
TG		 2932 if (plen > 128)
2933 return -EINVAL;
2934
af284937
DL		 2935 dev = __dev_get_by_index(net, ifindex);
2936 if (!dev)
1da177e4
LT		 2937 return -ENODEV;
2938
e5d08d71 2939 idev = __in6_dev_get(dev);
63159f29 2940 if (!idev)
1da177e4
LT		 2941 return -ENXIO;
2942
2943 read_lock_bh(&idev->lock);
502a2ffd 2944 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2945 if (ifp->prefix_len == plen &&
2946 ipv6_addr_equal(pfx, &ifp->addr)) {
2947 in6_ifa_hold(ifp);
2948 read_unlock_bh(&idev->lock);
1ab1457c 2949
6046d5b4
HK		 2950 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2951 (ifa_flags & IFA_F_MANAGETEMPADDR))
2952 manage_tempaddrs(idev, ifp, 0, 0, false,
2953 jiffies);
1da177e4 2954 ipv6_del_addr(ifp);
6046d5b4 2955 addrconf_verify_rtnl();
93a714d6
MC		 2956 if (ipv6_addr_is_multicast(pfx)) {
2957 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2958 false, pfx, dev->ifindex);
2959 }
1da177e4
LT		 2960 return 0;
2961 }
2962 }
2963 read_unlock_bh(&idev->lock);
2964 return -EADDRNOTAVAIL;
2965}
2966
2967
af284937 2968int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2969{
2970 struct in6_ifreq ireq;
2971 int err;
1ab1457c 2972
af31f412 2973 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2974 return -EPERM;
1ab1457c 2975
1da177e4
LT		 2976 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2977 return -EFAULT;
2978
2979 rtnl_lock();
caeaba79 2980 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937 2981 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
de95e047 2982 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, NULL);
1da177e4
LT		 2983 rtnl_unlock();
2984 return err;
2985}
2986
af284937 2987int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2988{
2989 struct in6_ifreq ireq;
2990 int err;
1ab1457c 2991
af31f412 2992 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2993 return -EPERM;
2994
2995 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2996 return -EFAULT;
2997
2998 rtnl_lock();
6046d5b4 2999 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 3000 ireq.ifr6_prefixlen);
1da177e4
LT		 3001 rtnl_unlock();
3002 return err;
3003}
3004
b5f348e5
IJ		 3005static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3006 int plen, int scope)
3007{
3008 struct inet6_ifaddr *ifp;
3009
8a226b2c 3010 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741 3011 scope, IFA_F_PERMANENT,
f3d9832e 3012 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME,
de95e047 3013 true, NULL);
b5f348e5
IJ		 3014 if (!IS_ERR(ifp)) {
3015 spin_lock_bh(&ifp->lock);
3016 ifp->flags &= ~IFA_F_TENTATIVE;
3017 spin_unlock_bh(&ifp->lock);
764d3be6 3018 rt_genid_bump_ipv6(dev_net(idev->dev));
b5f348e5
IJ		 3019 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3020 in6_ifa_put(ifp);
3021 }
3022}
3023
07a93626 3024#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3025static void sit_add_v4_addrs(struct inet6_dev *idev)
3026{
1da177e4
LT		 3027 struct in6_addr addr;
3028 struct net_device *dev;
c346dca1 3029 struct net *net = dev_net(idev->dev);
929c9cf3 3030 int scope, plen;
f0e2acfa 3031 u32 pflags = 0;
1da177e4
LT		 3032
3033 ASSERT_RTNL();
3034
3035 memset(&addr, 0, sizeof(struct in6_addr));
3036 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3037
3038 if (idev->dev->flags&IFF_POINTOPOINT) {
3039 addr.s6_addr32[0] = htonl(0xfe800000);
3040 scope = IFA_LINK;
929c9cf3 3041 plen = 64;
1da177e4
LT		 3042 } else {
3043 scope = IPV6_ADDR_COMPATv4;
929c9cf3 3044 plen = 96;
f0e2acfa 3045 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 3046 }
3047
3048 if (addr.s6_addr32[3]) {
929c9cf3 3049 add_addr(idev, &addr, plen, scope);
f0e2acfa 3050 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 3051 return;
3052 }
3053
6fda7350 3054 for_each_netdev(net, dev) {
8e5e8f30 3055 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 3056 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 3057 struct in_ifaddr *ifa;
1da177e4
LT		 3058
3059 int flag = scope;
3060
3061 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 3062
3063 addr.s6_addr32[3] = ifa->ifa_local;
3064
3065 if (ifa->ifa_scope == RT_SCOPE_LINK)
3066 continue;
3067 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3068 if (idev->dev->flags&IFF_POINTOPOINT)
3069 continue;
3070 flag |= IFA_HOST;
3071 }
1da177e4 3072
b5f348e5 3073 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 3074 addrconf_prefix_route(&addr, plen, idev->dev, 0,
3075 pflags);
1da177e4
LT		 3076 }
3077 }
1ab1457c 3078 }
1da177e4 3079}
0be669bb 3080#endif
1da177e4
LT		 3081
3082static void init_loopback(struct net_device *dev)
3083{
3084 struct inet6_dev *idev;
1da177e4
LT		 3085
3086 /* ::1 */
3087
3088 ASSERT_RTNL();
3089
e5d08d71 3090 idev = ipv6_find_idev(dev);
63159f29 3091 if (!idev) {
91df42be 3092 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3093 return;
3094 }
3095
b5f348e5 3096 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 3097}
3098
2ad3ed59
AA		 3099void addrconf_add_linklocal(struct inet6_dev *idev,
3100 const struct in6_addr *addr, u32 flags)
1da177e4 3101{
8e5e8f30 3102 struct inet6_ifaddr *ifp;
64236f3f 3103 u32 addr_flags = flags | IFA_F_PERMANENT;
95c385b4
NH		 3104
3105#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 3106 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3107 idev->cnf.optimistic_dad) &&
702beb87 3108 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 3109 addr_flags |= IFA_F_OPTIMISTIC;
3110#endif
1da177e4 3111
07edd741 3112 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
de95e047 3113 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, true, NULL);
1da177e4 3114 if (!IS_ERR(ifp)) {
46d48046 3115 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 3116 addrconf_dad_start(ifp);
1da177e4
LT		 3117 in6_ifa_put(ifp);
3118 }
3119}
2ad3ed59 3120EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
1da177e4 3121
622c81d5
HFS		 3122static bool ipv6_reserved_interfaceid(struct in6_addr address)
3123{
3124 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3125 return true;
3126
3127 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3128 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3129 return true;
3130
3131 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3132 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3133 return true;
3134
3135 return false;
3136}
3137
3138static int ipv6_generate_stable_address(struct in6_addr *address,
3139 u8 dad_count,
3140 const struct inet6_dev *idev)
3141{
622c81d5
HFS		 3142 static DEFINE_SPINLOCK(lock);
3143 static __u32 digest[SHA_DIGEST_WORDS];
3144 static __u32 workspace[SHA_WORKSPACE_WORDS];
3145
3146 static union {
3147 char __data[SHA_MESSAGE_BYTES];
3148 struct {
3149 struct in6_addr secret;
ff40217e 3150 __be32 prefix[2];
622c81d5
HFS		 3151 unsigned char hwaddr[MAX_ADDR_LEN];
3152 u8 dad_count;
3153 } __packed;
3154 } data;
3155
3156 struct in6_addr secret;
3157 struct in6_addr temp;
3158 struct net *net = dev_net(idev->dev);
3159
3160 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3161
3162 if (idev->cnf.stable_secret.initialized)
3163 secret = idev->cnf.stable_secret.secret;
3164 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3165 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3166 else
3167 return -1;
3168
3169retry:
3170 spin_lock_bh(&lock);
3171
3172 sha_init(digest);
3173 memset(&data, 0, sizeof(data));
3174 memset(workspace, 0, sizeof(workspace));
3175 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3176 data.prefix[0] = address->s6_addr32[0];
3177 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3178 data.secret = secret;
3179 data.dad_count = dad_count;
3180
3181 sha_transform(digest, data.__data, workspace);
3182
3183 temp = *address;
ff40217e
HFS		 3184 temp.s6_addr32[2] = (__force __be32)digest[0];
3185 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3186
3187 spin_unlock_bh(&lock);
3188
3189 if (ipv6_reserved_interfaceid(temp)) {
3190 dad_count++;
1855b7c3 3191 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3192 return -1;
3193 goto retry;
3194 }
3195
3196 *address = temp;
3197 return 0;
3198}
3199
cc9da6cc
BM		 3200static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3201{
3202 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3203
3204 if (s->initialized)
3205 return;
3206 s = &idev->cnf.stable_secret;
3207 get_random_bytes(&s->secret, sizeof(s->secret));
3208 s->initialized = true;
3209}
3210
bc91b0f0
JP		 3211static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3212{
622c81d5
HFS		 3213 struct in6_addr addr;
3214
ca254490
DA		 3215 /* no link local addresses on L3 master devices */
3216 if (netif_is_l3_master(idev->dev))
3217 return;
3218
622c81d5 3219 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3220
d35a00b8 3221 switch (idev->cnf.addr_gen_mode) {
cc9da6cc
BM		 3222 case IN6_ADDR_GEN_MODE_RANDOM:
3223 ipv6_gen_mode_random_init(idev);
3224 /* fallthrough */
3225 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3226 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3227 addrconf_add_linklocal(idev, &addr,
3228 IFA_F_STABLE_PRIVACY);
622c81d5
HFS		 3229 else if (prefix_route)
3230 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3231 break;
3232 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3233 /* addrconf_add_linklocal also adds a prefix_route and we
3234 * only need to care about prefix routes if ipv6_generate_eui64
3235 * couldn't generate one.
3236 */
3237 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3238 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0
JP		 3239 else if (prefix_route)
3240 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3241 break;
3242 case IN6_ADDR_GEN_MODE_NONE:
3243 default:
3244 /* will not add any link local address */
3245 break;
bc91b0f0
JP		 3246 }
3247}
3248
1da177e4
LT		 3249static void addrconf_dev_config(struct net_device *dev)
3250{
8e5e8f30 3251 struct inet6_dev *idev;
1da177e4
LT		 3252
3253 ASSERT_RTNL();
3254
74235a25
HX		 3255 if ((dev->type != ARPHRD_ETHER) &&
3256 (dev->type != ARPHRD_FDDI) &&
74235a25 3257 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3258 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3259 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3260 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc 3261 (dev->type != ARPHRD_6LOWPAN) &&
45ce0fd1
FJ		 3262 (dev->type != ARPHRD_IP6GRE) &&
3263 (dev->type != ARPHRD_IPGRE) &&
3264 (dev->type != ARPHRD_TUNNEL) &&
cc9da6cc 3265 (dev->type != ARPHRD_NONE)) {
74235a25
HX		 3266 /* Alas, we support only Ethernet autoconfiguration. */
3267 return;
3268 }
3269
1da177e4 3270 idev = addrconf_add_dev(dev);
64e724f6 3271 if (IS_ERR(idev))
1da177e4
LT		 3272 return;
3273
cc9da6cc
BM		 3274 /* this device type has no EUI support */
3275 if (dev->type == ARPHRD_NONE &&
d35a00b8
FJ		 3276 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3277 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc 3278
bc91b0f0 3279 addrconf_addr_gen(idev, false);
1da177e4
LT		 3280}
3281
07a93626 3282#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3283static void addrconf_sit_config(struct net_device *dev)
3284{
3285 struct inet6_dev *idev;
3286
3287 ASSERT_RTNL();
3288
1ab1457c
YH		 3289 /*
3290 * Configure the tunnel with one of our IPv4
3291 * addresses... we should configure all of
1da177e4
LT		 3292 * our v4 addrs in the tunnel
3293 */
3294
e5d08d71 3295 idev = ipv6_find_idev(dev);
63159f29 3296 if (!idev) {
91df42be 3297 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3298 return;
3299 }
3300
c7dc89c0 3301 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3302 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3303 return;
3304 }
3305
1da177e4
LT		 3306 sit_add_v4_addrs(idev);
3307
62b54dd9 3308 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3309 addrconf_add_mroute(dev);
1da177e4 3310}
0be669bb 3311#endif
1da177e4 3312
07a93626 3313#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3314static void addrconf_gre_config(struct net_device *dev)
3315{
3316 struct inet6_dev *idev;
aee80b54 3317
aee80b54 3318 ASSERT_RTNL();
3319
e5d08d71 3320 idev = ipv6_find_idev(dev);
63159f29 3321 if (!idev) {
91df42be 3322 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3323 return;
3324 }
3325
bc91b0f0 3326 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3327 if (dev->flags & IFF_POINTOPOINT)
3328 addrconf_add_mroute(dev);
aee80b54 3329}
3330#endif
3331
f1705ec1
DA		 3332static int fixup_permanent_addr(struct inet6_dev *idev,
3333 struct inet6_ifaddr *ifp)
3334{
fc882fcf 3335 /* !rt6i_node means the host route was removed from the
8048ced9
DA		 3336 * FIB, for example, if 'lo' device is taken down. In that
3337 * case regenerate the host route.
3338 */
fc882fcf 3339 if (!ifp->rt || !ifp->rt->rt6i_node) {
8048ced9 3340 struct rt6_info *rt, *prev;
f1705ec1
DA		 3341
3342 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
63a4e80b 3343 if (IS_ERR(rt))
f1705ec1
DA		 3344 return PTR_ERR(rt);
3345
8048ced9
DA		 3346 /* ifp->rt can be accessed outside of rtnl */
3347 spin_lock(&ifp->lock);
3348 prev = ifp->rt;
f1705ec1 3349 ifp->rt = rt;
8048ced9
DA		 3350 spin_unlock(&ifp->lock);
3351
3352 ip6_rt_put(prev);
f1705ec1
DA		 3353 }
3354
3355 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3356 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3357 idev->dev, 0, 0);
3358 }
3359
6d717134
DA		 3360 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3361 addrconf_dad_start(ifp);
f1705ec1
DA		 3362
3363 return 0;
3364}
3365
3366static void addrconf_permanent_addr(struct net_device *dev)
3367{
3368 struct inet6_ifaddr *ifp, *tmp;
3369 struct inet6_dev *idev;
3370
3371 idev = __in6_dev_get(dev);
3372 if (!idev)
3373 return;
3374
3375 write_lock_bh(&idev->lock);
3376
3377 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3378 if ((ifp->flags & IFA_F_PERMANENT) &&
3379 fixup_permanent_addr(idev, ifp) < 0) {
3380 write_unlock_bh(&idev->lock);
e669b869 3381 in6_ifa_hold(ifp);
f1705ec1
DA		 3382 ipv6_del_addr(ifp);
3383 write_lock_bh(&idev->lock);
3384
3385 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3386 idev->dev->name, &ifp->addr);
3387 }
3388 }
3389
3390 write_unlock_bh(&idev->lock);
3391}
3392
1ab1457c 3393static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3394 void *ptr)
1da177e4 3395{
351638e7 3396 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4f7f34ea 3397 struct netdev_notifier_changeupper_info *info;
748e2d93 3398 struct inet6_dev *idev = __in6_dev_get(dev);
60abc0be 3399 struct net *net = dev_net(dev);
c5e33bdd 3400 int run_pending = 0;
b217d616 3401 int err;
1da177e4 3402
e21e8467 3403 switch (event) {
45ba9dd2 3404 case NETDEV_REGISTER:
74235a25 3405 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3406 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3407 if (IS_ERR(idev))
3408 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3409 }
3410 break;
bcdd553f 3411
b7b0b1d2
AD		 3412 case NETDEV_CHANGEMTU:
3413 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3414 if (dev->mtu < IPV6_MIN_MTU) {
60abc0be 3415 addrconf_ifdown(dev, dev != net->loopback_dev);
b7b0b1d2
AD		 3416 break;
3417 }
3418
3419 if (idev) {
3420 rt6_mtu_change(dev, dev->mtu);
3421 idev->cnf.mtu6 = dev->mtu;
3422 break;
3423 }
3424
3425 /* allocate new idev */
3426 idev = ipv6_add_dev(dev);
3427 if (IS_ERR(idev))
3428 break;
3429
3430 /* device is still not ready */
3431 if (!(idev->if_flags & IF_READY))
3432 break;
3433
3434 run_pending = 1;
3435
3436 /* fall through */
3437
1da177e4 3438 case NETDEV_UP:
3c21edbd 3439 case NETDEV_CHANGE:
c2edacf8
JV		 3440 if (dev->flags & IFF_SLAVE)
3441 break;
3442
3ce62a84
WC		 3443 if (idev && idev->cnf.disable_ipv6)
3444 break;
3445
3c21edbd 3446 if (event == NETDEV_UP) {
38bd10c4
DA		 3447 /* restore routes for permanent addresses */
3448 addrconf_permanent_addr(dev);
3449
1f372c7b 3450 if (!addrconf_link_ready(dev)) {
3c21edbd 3451 /* device is not ready yet. */
f3213831 3452 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3453 dev->name);
3454 break;
3455 }
99081049 3456
d31c7b8f
EP		 3457 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3458 idev = ipv6_add_dev(dev);
3459
a317a2f1 3460 if (!IS_ERR_OR_NULL(idev)) {
99081049 3461 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3462 run_pending = 1;
3463 }
b7b0b1d2 3464 } else if (event == NETDEV_CHANGE) {
1f372c7b 3465 if (!addrconf_link_ready(dev)) {
3c21edbd 3466 /* device is still not ready. */
27c6fa73 3467 rt6_sync_down_dev(dev, event);
3c21edbd
YH		 3468 break;
3469 }
3470
3471 if (idev) {
a088d1d7
LL		 3472 if (idev->if_flags & IF_READY) {
3473 /* device is already configured -
3474 * but resend MLD reports, we might
3475 * have roamed and need to update
3476 * multicast snooping switches
3477 */
3478 ipv6_mc_up(idev);
27c6fa73 3479 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3c21edbd 3480 break;
a088d1d7 3481 }
3c21edbd
YH		 3482 idev->if_flags |= IF_READY;
3483 }
3484
f3213831
JP		 3485 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3486 dev->name);
3c21edbd 3487
c5e33bdd 3488 run_pending = 1;
3c21edbd
YH		 3489 }
3490
e21e8467 3491 switch (dev->type) {
07a93626 3492#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3493 case ARPHRD_SIT:
3494 addrconf_sit_config(dev);
3495 break;
aee80b54 3496#endif
07a93626 3497#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3498 case ARPHRD_IPGRE:
3499 addrconf_gre_config(dev);
3500 break;
0be669bb 3501#endif
1da177e4
LT		 3502 case ARPHRD_LOOPBACK:
3503 init_loopback(dev);
3504 break;
3505
3506 default:
3507 addrconf_dev_config(dev);
3508 break;
3ff50b79 3509 }
bcdd553f 3510
a317a2f1 3511 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3512 if (run_pending)
3513 addrconf_dad_run(idev);
3514
2127d95a
IS		 3515 /* Device has an address by now */
3516 rt6_sync_up(dev, RTNH_F_DEAD);
3517
bcdd553f
SH		 3518 /*
3519 * If the MTU changed during the interface down,
3520 * when the interface up, the changed MTU must be
3521 * reflected in the idev as well as routers.
1da177e4 3522 */
bcdd553f
SH		 3523 if (idev->cnf.mtu6 != dev->mtu &&
3524 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3525 rt6_mtu_change(dev, dev->mtu);
3526 idev->cnf.mtu6 = dev->mtu;
3527 }
3528 idev->tstamp = jiffies;
3529 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3530
3531 /*
3532 * If the changed mtu during down is lower than
3533 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3534 */
3535 if (dev->mtu < IPV6_MIN_MTU)
60abc0be 3536 addrconf_ifdown(dev, dev != net->loopback_dev);
1da177e4
LT		 3537 }
3538 break;
3539
1da177e4
LT		 3540 case NETDEV_DOWN:
3541 case NETDEV_UNREGISTER:
3542 /*
3543 * Remove all addresses from this interface.
3544 */
3545 addrconf_ifdown(dev, event != NETDEV_DOWN);
3546 break;
3c21edbd 3547
1da177e4 3548 case NETDEV_CHANGENAME:
1da177e4 3549 if (idev) {
5632c515 3550 snmp6_unregister_dev(idev);
408c4768 3551 addrconf_sysctl_unregister(idev);
a317a2f1 3552 err = addrconf_sysctl_register(idev);
b217d616
HX		 3553 if (err)
3554 return notifier_from_errno(err);
a317a2f1
WC		 3555 err = snmp6_register_dev(idev);
3556 if (err) {
3557 addrconf_sysctl_unregister(idev);
3558 return notifier_from_errno(err);
3559 }
5632c515 3560 }
1da177e4 3561 break;
bcdd553f 3562
93d9b7d7
JP		 3563 case NETDEV_PRE_TYPE_CHANGE:
3564 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3565 if (idev)
3566 addrconf_type_change(dev, event);
75c78500 3567 break;
4f7f34ea
DA		 3568
3569 case NETDEV_CHANGEUPPER:
3570 info = ptr;
3571
3572 /* flush all routes if dev is linked to or unlinked from
3573 * an L3 master device (e.g., VRF)
3574 */
3575 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3576 addrconf_ifdown(dev, 0);
3ff50b79 3577 }
1da177e4
LT		 3578
3579 return NOTIFY_OK;
3580}
3581
3582/*
3583 * addrconf module should be notified of a device going up
3584 */
3585static struct notifier_block ipv6_dev_notf = {
3586 .notifier_call = addrconf_notify,
242d3a49 3587 .priority = ADDRCONF_NOTIFY_PRIORITY,
1da177e4
LT		 3588};
3589
93d9b7d7 3590static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3591{
3592 struct inet6_dev *idev;
3593 ASSERT_RTNL();
3594
3595 idev = __in6_dev_get(dev);
3596
93d9b7d7 3597 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3598 ipv6_mc_remap(idev);
93d9b7d7 3599 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3600 ipv6_mc_unmap(idev);
3601}
3602
70af921d
DA		 3603static bool addr_is_local(const struct in6_addr *addr)
3604{
3605 return ipv6_addr_type(addr) &
3606 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3607}
3608
1da177e4
LT		 3609static int addrconf_ifdown(struct net_device *dev, int how)
3610{
4c981e28 3611 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN;
c346dca1 3612 struct net *net = dev_net(dev);
502a2ffd 3613 struct inet6_dev *idev;
f1705ec1 3614 struct inet6_ifaddr *ifa, *tmp;
f1705ec1
DA		 3615 int _keep_addr;
3616 bool keep_addr;
73a8bd74 3617 int state, i;
1da177e4
LT		 3618
3619 ASSERT_RTNL();
3620
4c981e28 3621 rt6_disable_ip(dev, event);
1da177e4
LT		 3622
3623 idev = __in6_dev_get(dev);
63159f29 3624 if (!idev)
1da177e4
LT		 3625 return -ENODEV;
3626
bcdd553f
SH		 3627 /*
3628 * Step 1: remove reference to ipv6 device from parent device.
3629 * Do not dev_put!
1da177e4 3630 */
439e2385 3631 if (how) {
1da177e4 3632 idev->dead = 1;
8814c4b5
YH		 3633
3634 /* protected by rtnl_lock */
a9b3cd7f 3635 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3636
3637 /* Step 1.5: remove snmp6 entry */
3638 snmp6_unregister_dev(idev);
3639
3640 }
3641
f1705ec1
DA		 3642 /* aggregate the system setting and interface setting */
3643 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3644 if (!_keep_addr)
3645 _keep_addr = idev->cnf.keep_addr_on_down;
3646
3647 /* combine the user config with event to determine if permanent
3648 * addresses are to be removed from address hash table
3649 */
bc561632 3650 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
f1705ec1 3651
73a8bd74
DM		 3652 /* Step 2: clear hash table */
3653 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3654 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3655
3656 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3657restart:
b67bfe0d 3658 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3659 if (ifa->idev == idev) {
c15b1cca 3660 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3661 /* combined flag + permanent flag decide if
3662 * address is retained on a down event
3663 */
3664 if (!keep_addr ||
70af921d
DA		 3665 !(ifa->flags & IFA_F_PERMANENT) ||
3666 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3667 hlist_del_init_rcu(&ifa->addr_lst);
3668 goto restart;
3669 }
73a8bd74
DM		 3670 }
3671 }
3672 spin_unlock_bh(&addrconf_hash_lock);
3673 }
3674
1da177e4
LT		 3675 write_lock_bh(&idev->lock);
3676
b7b1bfce
HFS		 3677 addrconf_del_rs_timer(idev);
3678
bcdd553f 3679 /* Step 2: clear flags for stateless addrconf */
439e2385 3680 if (!how)
3c21edbd 3681 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3682
bcdd553f 3683 /* Step 3: clear tempaddr list */
372e6c8f 3684 while (!list_empty(&idev->tempaddr_list)) {
3685 ifa = list_first_entry(&idev->tempaddr_list,
3686 struct inet6_ifaddr, tmp_list);
3687 list_del(&ifa->tmp_list);
1da177e4
LT		 3688 write_unlock_bh(&idev->lock);
3689 spin_lock_bh(&ifa->lock);
3690
3691 if (ifa->ifpub) {
3692 in6_ifa_put(ifa->ifpub);
3693 ifa->ifpub = NULL;
3694 }
3695 spin_unlock_bh(&ifa->lock);
3696 in6_ifa_put(ifa);
3697 write_lock_bh(&idev->lock);
3698 }
8f37ada5 3699
f1705ec1
DA		 3700 /* re-combine the user config with event to determine if permanent
3701 * addresses are to be removed from the interface list
3702 */
bc561632 3703 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
84e8b803 3704
f1705ec1 3705 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
38bd10c4 3706 struct rt6_info *rt = NULL;
a2d6cbb0 3707 bool keep;
38bd10c4 3708
f1705ec1 3709 addrconf_del_dad_work(ifa);
84e8b803 3710
a2d6cbb0
RV		 3711 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3712 !addr_is_local(&ifa->addr);
a2d6cbb0 3713
73a8bd74 3714 write_unlock_bh(&idev->lock);
8e8e676d 3715 spin_lock_bh(&ifa->lock);
f1705ec1 3716
a2d6cbb0 3717 if (keep) {
f1705ec1
DA		 3718 /* set state to skip the notifier below */
3719 state = INET6_IFADDR_STATE_DEAD;
6d717134 3720 ifa->state = INET6_IFADDR_STATE_PREDAD;
f1705ec1
DA		 3721 if (!(ifa->flags & IFA_F_NODAD))
3722 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3723
3724 rt = ifa->rt;
3725 ifa->rt = NULL;
f1705ec1
DA		 3726 } else {
3727 state = ifa->state;
3728 ifa->state = INET6_IFADDR_STATE_DEAD;
f1705ec1
DA		 3729 }
3730
8e8e676d 3731 spin_unlock_bh(&ifa->lock);
9d82ca98 3732
38bd10c4
DA		 3733 if (rt)
3734 ip6_del_rt(rt);
3735
73a8bd74
DM		 3736 if (state != INET6_IFADDR_STATE_DEAD) {
3737 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3738 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
ea06f717
MM		 3739 } else {
3740 if (idev->cnf.forwarding)
3741 addrconf_leave_anycast(ifa);
3742 addrconf_leave_solict(ifa->idev, &ifa->addr);
27bdb2ab 3743 }
8f37ada5 3744
73a8bd74 3745 write_lock_bh(&idev->lock);
8ef802aa
ED		 3746 if (!keep) {
3747 list_del_rcu(&ifa->if_list);
3748 in6_ifa_put(ifa);
3749 }
73a8bd74 3750 }
8f37ada5 3751
1da177e4
LT		 3752 write_unlock_bh(&idev->lock);
3753
381f4dca
SD		 3754 /* Step 5: Discard anycast and multicast list */
3755 if (how) {
3756 ipv6_ac_destroy_dev(idev);
1da177e4 3757 ipv6_mc_destroy_dev(idev);
381f4dca 3758 } else {
1da177e4 3759 ipv6_mc_down(idev);
381f4dca 3760 }
1da177e4 3761
1da177e4 3762 idev->tstamp = jiffies;
1ab1457c 3763
bcdd553f 3764 /* Last: Shot the device (if unregistered) */
439e2385 3765 if (how) {
408c4768 3766 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3767 neigh_parms_release(&nd_tbl, idev->nd_parms);
3768 neigh_ifdown(&nd_tbl, dev);
3769 in6_dev_put(idev);
3770 }
3771 return 0;
3772}
3773
e99e88a9 3774static void addrconf_rs_timer(struct timer_list *t)
1da177e4 3775{
e99e88a9 3776 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
caf92bc4 3777 struct net_device *dev = idev->dev;
b7b1bfce 3778 struct in6_addr lladdr;
1da177e4 3779
b7b1bfce 3780 write_lock(&idev->lock);
5b2a1953 3781 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3782 goto out;
3783
9ba2add3 3784 if (!ipv6_accept_ra(idev))
5b2a1953 3785 goto out;
3786
3787 /* Announcement received after solicitation was sent */
3788 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3789 goto out;
1da177e4 3790
bd11f074 3791 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
caf92bc4
CW		 3792 write_unlock(&idev->lock);
3793 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3794 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3795 &in6addr_linklocal_allrouters);
3796 else
caf92bc4 3797 goto put;
1da177e4 3798
caf92bc4 3799 write_lock(&idev->lock);
bd11f074
MŻ		 3800 idev->rs_interval = rfc3315_s14_backoff_update(
3801 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
b7b1bfce
HFS		 3802 /* The wait after the last probe can be shorter */
3803 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3804 idev->cnf.rtr_solicits) ?
3805 idev->cnf.rtr_solicit_delay :
bd11f074 3806 idev->rs_interval);
1da177e4 3807 } else {
1da177e4
LT		 3808 /*
3809 * Note: we do not support deprecated "all on-link"
3810 * assumption any longer.
3811 */
91df42be 3812 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3813 }
3814
3815out:
b7b1bfce 3816 write_unlock(&idev->lock);
caf92bc4 3817put:
b7b1bfce 3818 in6_dev_put(idev);
1da177e4
LT		 3819}
3820
3821/*
3822 * Duplicate Address Detection
3823 */
3c21edbd
YH		 3824static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3825{
3826 unsigned long rand_num;
3827 struct inet6_dev *idev = ifp->idev;
adc176c5 3828 u64 nonce;
3c21edbd 3829
95c385b4
NH		 3830 if (ifp->flags & IFA_F_OPTIMISTIC)
3831 rand_num = 0;
3832 else
63862b5b 3833 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3834
adc176c5
EN		 3835 nonce = 0;
3836 if (idev->cnf.enhanced_dad ||
3837 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3838 do
3839 get_random_bytes(&nonce, 6);
3840 while (nonce == 0);
3841 }
3842 ifp->dad_nonce = nonce;
b7b1bfce 3843 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3844 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3845}
3846
c15b1cca 3847static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3848{
3849 struct inet6_dev *idev = ifp->idev;
3850 struct net_device *dev = idev->dev;
764d3be6 3851 bool bump_id, notify = false;
1da177e4
LT		 3852
3853 addrconf_join_solict(dev, &ifp->addr);
3854
63862b5b 3855 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3856
3857 read_lock_bh(&idev->lock);
622ccdf1 3858 spin_lock(&ifp->lock);
e9d3e084 3859 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3860 goto out;
1da177e4
LT		 3861
3862 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
a2d3f3e3
MC		 3863 (dev_net(dev)->ipv6.devconf_all->accept_dad < 1 &&
3864 idev->cnf.accept_dad < 1) ||
55ebaef1
NT		 3865 !(ifp->flags&IFA_F_TENTATIVE) ||
3866 ifp->flags & IFA_F_NODAD) {
c76fe2d9
DA		 3867 bool send_na = false;
3868
3869 if (ifp->flags & IFA_F_TENTATIVE &&
3870 !(ifp->flags & IFA_F_OPTIMISTIC))
3871 send_na = true;
764d3be6 3872 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3873 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3874 spin_unlock(&ifp->lock);
1da177e4
LT		 3875 read_unlock_bh(&idev->lock);
3876
c76fe2d9 3877 addrconf_dad_completed(ifp, bump_id, send_na);
1da177e4
LT		 3878 return;
3879 }
3880
6732bade 3881 if (!(idev->if_flags & IF_READY)) {
21809faf 3882 spin_unlock(&ifp->lock);
6732bade 3883 read_unlock_bh(&idev->lock);
3c21edbd 3884 /*
590a9887 3885 * If the device is not ready:
3c21edbd
YH		 3886 * - keep it tentative if it is a permanent address.
3887 * - otherwise, kill it.
3888 */
3889 in6_ifa_hold(ifp);
cc411d0b 3890 addrconf_dad_stop(ifp, 0);
6732bade 3891 return;
3c21edbd 3892 }
95c385b4
NH		 3893
3894 /*
3895 * Optimistic nodes can start receiving
3896 * Frames right away
3897 */
7fd2561e 3898 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3899 ip6_ins_rt(ifp->rt);
35e015e1 3900 if (ipv6_use_optimistic_addr(dev_net(dev), idev)) {
7fd2561e
EK		 3901 /* Because optimistic nodes can use this address,
3902 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3903 */
16186a82 3904 notify = true;
7fd2561e
EK		 3905 }
3906 }
95c385b4 3907
6732bade 3908 addrconf_dad_kick(ifp);
1da177e4 3909out:
622ccdf1 3910 spin_unlock(&ifp->lock);
1da177e4 3911 read_unlock_bh(&idev->lock);
16186a82 3912 if (notify)
3913 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 3914}
3915
c15b1cca 3916static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3917{
c15b1cca
HFS		 3918 bool begin_dad = false;
3919
8e8e676d 3920 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3921 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3922 ifp->state = INET6_IFADDR_STATE_PREDAD;
3923 begin_dad = true;
3924 }
8e8e676d 3925 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3926
3927 if (begin_dad)
3928 addrconf_mod_dad_work(ifp, 0);
3929}
3930
3931static void addrconf_dad_work(struct work_struct *w)
3932{
3933 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3934 struct inet6_ifaddr,
3935 dad_work);
1da177e4 3936 struct inet6_dev *idev = ifp->idev;
764d3be6 3937 bool bump_id, disable_ipv6 = false;
1da177e4
LT		 3938 struct in6_addr mcaddr;
3939
c15b1cca
HFS		 3940 enum {
3941 DAD_PROCESS,
3942 DAD_BEGIN,
3943 DAD_ABORT,
3944 } action = DAD_PROCESS;
3945
3946 rtnl_lock();
3947
8e8e676d 3948 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3949 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3950 action = DAD_BEGIN;
3951 ifp->state = INET6_IFADDR_STATE_DAD;
3952 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3953 action = DAD_ABORT;
3954 ifp->state = INET6_IFADDR_STATE_POSTDAD;
85b51b12 3955
35e015e1
MC		 3956 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
3957 idev->cnf.accept_dad > 1) &&
3958 !idev->cnf.disable_ipv6 &&
85b51b12
MM		 3959 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3960 struct in6_addr addr;
3961
3962 addr.s6_addr32[0] = htonl(0xfe800000);
3963 addr.s6_addr32[1] = 0;
3964
3965 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3966 ipv6_addr_equal(&ifp->addr, &addr)) {
3967 /* DAD failed for link-local based on MAC */
3968 idev->cnf.disable_ipv6 = 1;
3969
3970 pr_info("%s: IPv6 being disabled!\n",
3971 ifp->idev->dev->name);
3972 disable_ipv6 = true;
3973 }
3974 }
c15b1cca 3975 }
8e8e676d 3976 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3977
3978 if (action == DAD_BEGIN) {
3979 addrconf_dad_begin(ifp);
3980 goto out;
3981 } else if (action == DAD_ABORT) {
751eb6b6 3982 in6_ifa_hold(ifp);
c15b1cca 3983 addrconf_dad_stop(ifp, 1);
85b51b12
MM		 3984 if (disable_ipv6)
3985 addrconf_ifdown(idev->dev, 0);
c15b1cca
HFS		 3986 goto out;
3987 }
3988
b7b1bfce 3989 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3990 goto out;
3991
c15b1cca 3992 write_lock_bh(&idev->lock);
122e4519 3993 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3994 write_unlock_bh(&idev->lock);
1da177e4
LT		 3995 goto out;
3996 }
21809faf 3997
3998 spin_lock(&ifp->lock);
622ccdf1
HX		 3999 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4000 spin_unlock(&ifp->lock);
c15b1cca 4001 write_unlock_bh(&idev->lock);
622ccdf1
HX		 4002 goto out;
4003 }
4004
b7b1bfce 4005 if (ifp->dad_probes == 0) {
c76fe2d9
DA		 4006 bool send_na = false;
4007
1da177e4
LT		 4008 /*
4009 * DAD was successful
4010 */
4011
c76fe2d9
DA		 4012 if (ifp->flags & IFA_F_TENTATIVE &&
4013 !(ifp->flags & IFA_F_OPTIMISTIC))
4014 send_na = true;
764d3be6 4015 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 4016 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 4017 spin_unlock(&ifp->lock);
c15b1cca 4018 write_unlock_bh(&idev->lock);
1da177e4 4019
c76fe2d9 4020 addrconf_dad_completed(ifp, bump_id, send_na);
1da177e4
LT		 4021
4022 goto out;
4023 }
4024
b7b1bfce 4025 ifp->dad_probes--;
c15b1cca
HFS		 4026 addrconf_mod_dad_work(ifp,
4027 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 4028 spin_unlock(&ifp->lock);
c15b1cca 4029 write_unlock_bh(&idev->lock);
1da177e4
LT		 4030
4031 /* send a neighbour solicitation for our addr */
1da177e4 4032 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
adc176c5
EN		 4033 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4034 ifp->dad_nonce);
1da177e4
LT		 4035out:
4036 in6_ifa_put(ifp);
c15b1cca 4037 rtnl_unlock();
1da177e4
LT		 4038}
4039
11ffff75
HFS		 4040/* ifp->idev must be at least read locked */
4041static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4042{
4043 struct inet6_ifaddr *ifpiter;
4044 struct inet6_dev *idev = ifp->idev;
4045
602582ca
HFS		 4046 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4047 if (ifpiter->scope > IFA_LINK)
4048 break;
11ffff75
HFS		 4049 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4050 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4051 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4052 IFA_F_PERMANENT)
4053 return false;
4054 }
4055 return true;
4056}
4057
c76fe2d9
DA		 4058static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4059 bool send_na)
1da177e4 4060{
e21e8467 4061 struct net_device *dev = ifp->idev->dev;
b7b1bfce 4062 struct in6_addr lladdr;
b173ee48 4063 bool send_rs, send_mld;
b7b1bfce 4064
c15b1cca 4065 addrconf_del_dad_work(ifp);
1da177e4
LT		 4066
4067 /*
4068 * Configure the address for reception. Now it is valid.
4069 */
4070
4071 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4072
026359bc
TA		 4073 /* If added prefix is link local and we are prepared to process
4074 router advertisements, start sending router solicitations.
1da177e4
LT		 4075 */
4076
1ec047eb 4077 read_lock_bh(&ifp->idev->lock);
11ffff75 4078 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 4079 send_rs = send_mld &&
4080 ipv6_accept_ra(ifp->idev) &&
bd11f074 4081 ifp->idev->cnf.rtr_solicits != 0 &&
b173ee48 4082 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 4083 read_unlock_bh(&ifp->idev->lock);
4084
b173ee48
HFS		 4085 /* While dad is in progress mld report's source address is in6_addrany.
4086 * Resend with proper ll now.
4087 */
4088 if (send_mld)
4089 ipv6_mc_dad_complete(ifp->idev);
4090
c76fe2d9
DA		 4091 /* send unsolicited NA if enabled */
4092 if (send_na &&
4093 (ifp->idev->cnf.ndisc_notify ||
4094 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4095 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4096 /*router=*/ !!ifp->idev->cnf.forwarding,
4097 /*solicited=*/ false, /*override=*/ true,
4098 /*inc_opt=*/ true);
4099 }
4100
1ec047eb 4101 if (send_rs) {
1da177e4
LT		 4102 /*
4103 * If a host as already performed a random delay
4104 * [...] as part of DAD [...] there is no need
4105 * to delay again before sending the first RS
4106 */
1ec047eb 4107 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 4108 return;
1ec047eb 4109 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 4110
b7b1bfce
HFS		 4111 write_lock_bh(&ifp->idev->lock);
4112 spin_lock(&ifp->lock);
bd11f074
MŻ		 4113 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4114 ifp->idev->cnf.rtr_solicit_interval);
b7b1bfce 4115 ifp->idev->rs_probes = 1;
1da177e4 4116 ifp->idev->if_flags |= IF_RS_SENT;
bd11f074 4117 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
b7b1bfce
HFS		 4118 spin_unlock(&ifp->lock);
4119 write_unlock_bh(&ifp->idev->lock);
1da177e4 4120 }
764d3be6
PA		 4121
4122 if (bump_id)
4123 rt_genid_bump_ipv6(dev_net(dev));
a11a7f71
MH		 4124
4125 /* Make sure that a new temporary address will be created
4126 * before this temporary address becomes deprecated.
4127 */
4128 if (ifp->flags & IFA_F_TEMPORARY)
4129 addrconf_verify_rtnl();
1da177e4
LT		 4130}
4131
e21e8467
SH		 4132static void addrconf_dad_run(struct inet6_dev *idev)
4133{
c5e33bdd
YH		 4134 struct inet6_ifaddr *ifp;
4135
4136 read_lock_bh(&idev->lock);
502a2ffd 4137 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 4138 spin_lock(&ifp->lock);
f2344a13
HX		 4139 if (ifp->flags & IFA_F_TENTATIVE &&
4140 ifp->state == INET6_IFADDR_STATE_DAD)
4141 addrconf_dad_kick(ifp);
21809faf 4142 spin_unlock(&ifp->lock);
c5e33bdd
YH		 4143 }
4144 read_unlock_bh(&idev->lock);
4145}
4146
1da177e4
LT		 4147#ifdef CONFIG_PROC_FS
4148struct if6_iter_state {
3c40090a 4149 struct seq_net_private p;
1da177e4 4150 int bucket;
1d578303 4151 int offset;
1da177e4
LT		 4152};
4153
1d578303 4154static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4 4155{
1da177e4 4156 struct if6_iter_state *state = seq->private;
1218854a 4157 struct net *net = seq_file_net(seq);
a5c1d98f 4158 struct inet6_ifaddr *ifa = NULL;
1d578303 4159 int p = 0;
1da177e4 4160
1d578303
MM		 4161 /* initial bucket if pos is 0 */
4162 if (pos == 0) {
4163 state->bucket = 0;
4164 state->offset = 0;
4165 }
4166
4167 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
a5c1d98f 4168 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
1d578303 4169 addr_lst) {
9f0d3c27
ED		 4170 if (!net_eq(dev_net(ifa->idev->dev), net))
4171 continue;
1d578303
MM		 4172 /* sync with offset */
4173 if (p < state->offset) {
4174 p++;
4175 continue;
4176 }
4177 state->offset++;
9f0d3c27 4178 return ifa;
1d578303
MM		 4179 }
4180
4181 /* prepare for next bucket */
4182 state->offset = 0;
4183 p = 0;
1da177e4 4184 }
c2e21293 4185 return NULL;
1da177e4
LT		 4186}
4187
c2e21293 4188static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4189 struct inet6_ifaddr *ifa)
1da177e4
LT		 4190{
4191 struct if6_iter_state *state = seq->private;
1218854a 4192 struct net *net = seq_file_net(seq);
1da177e4 4193
a5c1d98f 4194 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
9f0d3c27
ED		 4195 if (!net_eq(dev_net(ifa->idev->dev), net))
4196 continue;
1d578303 4197 state->offset++;
9f0d3c27 4198 return ifa;
1d578303 4199 }
3c40090a 4200
c2e21293 4201 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 4202 state->offset = 0;
a5c1d98f 4203 hlist_for_each_entry_rcu(ifa,
c2e21293 4204 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 4205 if (!net_eq(dev_net(ifa->idev->dev), net))
4206 continue;
1d578303 4207 state->offset++;
9f0d3c27 4208 return ifa;
c2e21293 4209 }
1da177e4 4210 }
3c40090a 4211
c2e21293 4212 return NULL;
1da177e4
LT		 4213}
4214
1da177e4 4215static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
a5c1d98f 4216 __acquires(rcu)
1da177e4 4217{
a5c1d98f 4218 rcu_read_lock();
1d578303 4219 return if6_get_first(seq, *pos);
1da177e4
LT		 4220}
4221
4222static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4223{
4224 struct inet6_ifaddr *ifa;
4225
4226 ifa = if6_get_next(seq, v);
4227 ++*pos;
4228 return ifa;
4229}
4230
4231static void if6_seq_stop(struct seq_file *seq, void *v)
a5c1d98f 4232 __releases(rcu)
1da177e4 4233{
a5c1d98f 4234 rcu_read_unlock();
1da177e4
LT		 4235}
4236
4237static int if6_seq_show(struct seq_file *seq, void *v)
4238{
4239 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4240 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4241 &ifp->addr,
1da177e4
LT		 4242 ifp->idev->dev->ifindex,
4243 ifp->prefix_len,
4244 ifp->scope,
971a351c 4245 (u8) ifp->flags,
1da177e4
LT		 4246 ifp->idev->dev->name);
4247 return 0;
4248}
4249
56b3d975 4250static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4251 .start = if6_seq_start,
4252 .next = if6_seq_next,
4253 .show = if6_seq_show,
4254 .stop = if6_seq_stop,
4255};
4256
4257static int if6_seq_open(struct inode *inode, struct file *file)
4258{
3c40090a
DL		 4259 return seq_open_net(inode, file, &if6_seq_ops,
4260 sizeof(struct if6_iter_state));
1da177e4
LT		 4261}
4262
9a32144e 4263static const struct file_operations if6_fops = {
1da177e4
LT		 4264 .open = if6_seq_open,
4265 .read = seq_read,
4266 .llseek = seq_lseek,
3c40090a 4267 .release = seq_release_net,
1da177e4
LT		 4268};
4269
2c8c1e72 4270static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4271{
d6444062 4272 if (!proc_create("if_inet6", 0444, net->proc_net, &if6_fops))
1da177e4
LT		 4273 return -ENOMEM;
4274 return 0;
4275}
4276
2c8c1e72 4277static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4278{
ece31ffd 4279 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4280}
4281
4282static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4283 .init = if6_proc_net_init,
4284 .exit = if6_proc_net_exit,
3c40090a
DL		 4285};
4286
4287int __init if6_proc_init(void)
4288{
4289 return register_pernet_subsys(&if6_proc_net_ops);
4290}
4291
1da177e4
LT		 4292void if6_proc_exit(void)
4293{
3c40090a 4294 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4295}
4296#endif /* CONFIG_PROC_FS */
4297
07a93626 4298#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4299/* Check if address is a home address configured on any interface. */
b71d1d42 4300int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c 4301{
3f27fb23 4302 unsigned int hash = inet6_addr_hash(net, addr);
c2e21293 4303 struct inet6_ifaddr *ifp = NULL;
3f27fb23 4304 int ret = 0;
c2e21293 4305
4e5f47ab
ED		 4306 rcu_read_lock();
4307 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 4308 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 4309 continue;
caad295f 4310 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4311 (ifp->flags & IFA_F_HOMEADDRESS)) {
4312 ret = 1;
4313 break;
4314 }
4315 }
4e5f47ab 4316 rcu_read_unlock();
3b9f9a1c
NT		 4317 return ret;
4318}
4319#endif
4320
1da177e4
LT		 4321/*
4322 * Periodic address status verification
4323 */
4324
c15b1cca 4325static void addrconf_verify_rtnl(void)
1da177e4 4326{
b2db7564 4327 unsigned long now, next, next_sec, next_sched;
1da177e4 4328 struct inet6_ifaddr *ifp;
1da177e4
LT		 4329 int i;
4330
c15b1cca
HFS		 4331 ASSERT_RTNL();
4332
5c578aed 4333 rcu_read_lock_bh();
1da177e4 4334 now = jiffies;
b2db7564 4335 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4336
c15b1cca 4337 cancel_delayed_work(&addr_chk_work);
1da177e4 4338
bcdd553f 4339 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4340restart:
c15b1cca 4341 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 4342 unsigned long age;
1da177e4 4343
fad8da3e
YA		 4344 /* When setting preferred_lft to a value not zero or
4345 * infinity, while valid_lft is infinity
4346 * IFA_F_PERMANENT has a non-infinity life time.
4347 */
4348 if ((ifp->flags & IFA_F_PERMANENT) &&
4349 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4350 continue;
4351
4352 spin_lock(&ifp->lock);
b2db7564
YH		 4353 /* We try to batch several events at once. */
4354 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4355
8f27ebb9
YH		 4356 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4357 age >= ifp->valid_lft) {
1da177e4
LT		 4358 spin_unlock(&ifp->lock);
4359 in6_ifa_hold(ifp);
1da177e4
LT		 4360 ipv6_del_addr(ifp);
4361 goto restart;
8f27ebb9
YH		 4362 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4363 spin_unlock(&ifp->lock);
4364 continue;
1da177e4 4365 } else if (age >= ifp->prefered_lft) {
a1ed0526 4366 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4367 int deprecate = 0;
4368
4369 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4370 deprecate = 1;
4371 ifp->flags |= IFA_F_DEPRECATED;
4372 }
4373
fad8da3e
YA		 4374 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4375 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4376 next = ifp->tstamp + ifp->valid_lft * HZ;
4377
4378 spin_unlock(&ifp->lock);
4379
4380 if (deprecate) {
4381 in6_ifa_hold(ifp);
1da177e4
LT		 4382
4383 ipv6_ifa_notify(0, ifp);
4384 in6_ifa_put(ifp);
4385 goto restart;
4386 }
1da177e4
LT		 4387 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4388 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4389 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4390 ifp->idev->cnf.dad_transmits *
1f9248e5 4391 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 4392
1da177e4
LT		 4393 if (age >= ifp->prefered_lft - regen_advance) {
4394 struct inet6_ifaddr *ifpub = ifp->ifpub;
4395 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4396 next = ifp->tstamp + ifp->prefered_lft * HZ;
4397 if (!ifp->regen_count && ifpub) {
4398 ifp->regen_count++;
4399 in6_ifa_hold(ifp);
4400 in6_ifa_hold(ifpub);
4401 spin_unlock(&ifp->lock);
5c578aed 4402
291d809b
HY		 4403 spin_lock(&ifpub->lock);
4404 ifpub->regen_count = 0;
4405 spin_unlock(&ifpub->lock);
e64e469b 4406 rcu_read_unlock_bh();
fffcefe9 4407 ipv6_create_tempaddr(ifpub, ifp, true);
1da177e4
LT		 4408 in6_ifa_put(ifpub);
4409 in6_ifa_put(ifp);
e64e469b 4410 rcu_read_lock_bh();
1da177e4
LT		 4411 goto restart;
4412 }
4413 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4414 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4415 spin_unlock(&ifp->lock);
1da177e4
LT		 4416 } else {
4417 /* ifp->prefered_lft <= ifp->valid_lft */
4418 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4419 next = ifp->tstamp + ifp->prefered_lft * HZ;
4420 spin_unlock(&ifp->lock);
4421 }
4422 }
1da177e4
LT		 4423 }
4424
b2db7564
YH		 4425 next_sec = round_jiffies_up(next);
4426 next_sched = next;
4427
4428 /* If rounded timeout is accurate enough, accept it. */
4429 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4430 next_sched = next_sec;
4431
4432 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4433 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4434 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4435
e32ac250
JP		 4436 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4437 now, next, next_sec, next_sched);
c15b1cca 4438 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4439 rcu_read_unlock_bh();
1da177e4
LT		 4440}
4441
c15b1cca
HFS		 4442static void addrconf_verify_work(struct work_struct *w)
4443{
4444 rtnl_lock();
4445 addrconf_verify_rtnl();
4446 rtnl_unlock();
4447}
4448
4449static void addrconf_verify(void)
4450{
4451 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4452}
4453
caeaba79
ND		 4454static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4455 struct in6_addr **peer_pfx)
461d8837
TG		 4456{
4457 struct in6_addr *pfx = NULL;
4458
caeaba79
ND		 4459 *peer_pfx = NULL;
4460
461d8837
TG		 4461 if (addr)
4462 pfx = nla_data(addr);
4463
4464 if (local) {
4465 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4466 *peer_pfx = pfx;
4467 pfx = nla_data(local);
461d8837
TG		 4468 }
4469
4470 return pfx;
4471}
4472
ef7c79ed 4473static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4474 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4475 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4476 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4477 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 4478};
4479
1da177e4 4480static int
c21ef3e3
DA		 4481inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4482 struct netlink_ext_ack *extack)
1da177e4 4483{
3b1e0a65 4484 struct net *net = sock_net(skb->sk);
b933f716
TG		 4485 struct ifaddrmsg *ifm;
4486 struct nlattr *tb[IFA_MAX+1];
caeaba79 4487 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4488 u32 ifa_flags;
b933f716 4489 int err;
1da177e4 4490
fceb6435 4491 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4492 extack);
b933f716
TG		 4493 if (err < 0)
4494 return err;
4495
4496 ifm = nlmsg_data(nlh);
caeaba79 4497 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4498 if (!pfx)
1da177e4
LT		 4499 return -EINVAL;
4500
6046d5b4
HK		 4501 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4502
4503 /* We ignore other flags so far. */
4504 ifa_flags &= IFA_F_MANAGETEMPADDR;
4505
4506 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4507 ifm->ifa_prefixlen);
1da177e4
LT		 4508}
4509
479840ff 4510static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 4511 u32 prefered_lft, u32 valid_lft)
081bba5b 4512{
6f704992
YH		 4513 u32 flags;
4514 clock_t expires;
4bed72e4 4515 unsigned long timeout;
53bd6749 4516 bool was_managetempaddr;
5b84efec 4517 bool had_prefixroute;
46d48046 4518
c15b1cca
HFS		 4519 ASSERT_RTNL();
4520
081bba5b
NT		 4521 if (!valid_lft || (prefered_lft > valid_lft))
4522 return -EINVAL;
4523
53bd6749
JP		 4524 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4525 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4526 return -EINVAL;
4527
f1c02cfb
SD		 4528 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4529 ifa_flags &= ~IFA_F_OPTIMISTIC;
4530
4bed72e4
YH		 4531 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4532 if (addrconf_finite_timeout(timeout)) {
4533 expires = jiffies_to_clock_t(timeout * HZ);
4534 valid_lft = timeout;
6f704992 4535 flags = RTF_EXPIRES;
4bed72e4
YH		 4536 } else {
4537 expires = 0;
4538 flags = 0;
4539 ifa_flags |= IFA_F_PERMANENT;
6f704992 4540 }
081bba5b 4541
4bed72e4
YH		 4542 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4543 if (addrconf_finite_timeout(timeout)) {
4544 if (timeout == 0)
4545 ifa_flags |= IFA_F_DEPRECATED;
4546 prefered_lft = timeout;
4547 }
081bba5b
NT		 4548
4549 spin_lock_bh(&ifp->lock);
53bd6749 4550 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4551 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4552 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4553 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4554 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4555 IFA_F_NOPREFIXROUTE);
53bd6749 4556 ifp->flags |= ifa_flags;
081bba5b
NT		 4557 ifp->tstamp = jiffies;
4558 ifp->valid_lft = valid_lft;
4559 ifp->prefered_lft = prefered_lft;
4560
4561 spin_unlock_bh(&ifp->lock);
4562 if (!(ifp->flags&IFA_F_TENTATIVE))
4563 ipv6_ifa_notify(0, ifp);
081bba5b 4564
761aac73
TH		 4565 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4566 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4567 expires, flags);
5b84efec
TH		 4568 } else if (had_prefixroute) {
4569 enum cleanup_prefix_rt_t action;
4570 unsigned long rt_expires;
4571
4572 write_lock_bh(&ifp->idev->lock);
4573 action = check_cleanup_prefix_route(ifp, &rt_expires);
4574 write_unlock_bh(&ifp->idev->lock);
4575
4576 if (action != CLEANUP_PREFIX_RT_NOP) {
4577 cleanup_prefix_route(ifp, rt_expires,
4578 action == CLEANUP_PREFIX_RT_DEL);
4579 }
761aac73 4580 }
53bd6749
JP		 4581
4582 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4583 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4584 valid_lft = prefered_lft = 0;
4585 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4586 !was_managetempaddr, jiffies);
4587 }
4588
c15b1cca 4589 addrconf_verify_rtnl();
081bba5b
NT		 4590
4591 return 0;
4592}
4593
1da177e4 4594static int
c21ef3e3
DA		 4595inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4596 struct netlink_ext_ack *extack)
1da177e4 4597{
3b1e0a65 4598 struct net *net = sock_net(skb->sk);
461d8837
TG		 4599 struct ifaddrmsg *ifm;
4600 struct nlattr *tb[IFA_MAX+1];
caeaba79 4601 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 4602 struct inet6_ifaddr *ifa;
4603 struct net_device *dev;
f1c02cfb 4604 struct inet6_dev *idev;
55ebaef1 4605 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 4606 u32 ifa_flags;
461d8837 4607 int err;
1da177e4 4608
fceb6435 4609 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4610 extack);
461d8837
TG		 4611 if (err < 0)
4612 return err;
4613
4614 ifm = nlmsg_data(nlh);
caeaba79 4615 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4616 if (!pfx)
1da177e4
LT		 4617 return -EINVAL;
4618
461d8837 4619 if (tb[IFA_CACHEINFO]) {
0778769d 4620 struct ifa_cacheinfo *ci;
461d8837
TG		 4621
4622 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 4623 valid_lft = ci->ifa_valid;
461d8837
TG		 4624 preferred_lft = ci->ifa_prefered;
4625 } else {
4626 preferred_lft = INFINITY_LIFE_TIME;
4627 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 4628 }
4629
af284937 4630 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4631 if (!dev)
7198f8ce
TG		 4632 return -ENODEV;
4633
479840ff
JP		 4634 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4635
55ebaef1 4636 /* We ignore other flags so far. */
761aac73 4637 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
f1c02cfb
SD		 4638 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4639
4640 idev = ipv6_find_idev(dev);
4641 if (IS_ERR(idev))
4642 return PTR_ERR(idev);
4643
4644 if (!ipv6_allow_optimistic_dad(net, idev))
4645 ifa_flags &= ~IFA_F_OPTIMISTIC;
4646
4647 if (ifa_flags & IFA_F_NODAD && ifa_flags & IFA_F_OPTIMISTIC) {
4648 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4649 return -EINVAL;
4650 }
55ebaef1 4651
1cab3da6 4652 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
63159f29 4653 if (!ifa) {
7198f8ce
TG		 4654 /*
4655 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4656 * userspace already relies on not having to provide this.
7198f8ce 4657 */
caeaba79 4658 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937 4659 ifm->ifa_prefixlen, ifa_flags,
de95e047 4660 preferred_lft, valid_lft, extack);
081bba5b
NT		 4661 }
4662
7198f8ce
TG		 4663 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4664 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4665 err = -EEXIST;
4666 else
55ebaef1 4667 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 4668
4669 in6_ifa_put(ifa);
4670
4671 return err;
1da177e4
LT		 4672}
4673
479840ff 4674static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4675 u8 scope, int ifindex)
4676{
4677 struct ifaddrmsg *ifm;
4678
4679 ifm = nlmsg_data(nlh);
4680 ifm->ifa_family = AF_INET6;
4681 ifm->ifa_prefixlen = prefixlen;
4682 ifm->ifa_flags = flags;
4683 ifm->ifa_scope = scope;
4684 ifm->ifa_index = ifindex;
4685}
4686
85486af0
TG		 4687static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4688 unsigned long tstamp, u32 preferred, u32 valid)
4689{
4690 struct ifa_cacheinfo ci;
4691
18a31e1e
TG		 4692 ci.cstamp = cstamp_delta(cstamp);
4693 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4694 ci.ifa_prefered = preferred;
4695 ci.ifa_valid = valid;
4696
4697 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4698}
4699
101bb229
TG		 4700static inline int rt_scope(int ifa_scope)
4701{
4702 if (ifa_scope & IFA_HOST)
4703 return RT_SCOPE_HOST;
4704 else if (ifa_scope & IFA_LINK)
4705 return RT_SCOPE_LINK;
4706 else if (ifa_scope & IFA_SITE)
4707 return RT_SCOPE_SITE;
4708 else
4709 return RT_SCOPE_UNIVERSE;
4710}
4711
0ab6803b
TG		 4712static inline int inet6_ifaddr_msgsize(void)
4713{
339bf98f 4714 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4715 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4716 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4717 + nla_total_size(sizeof(struct ifa_cacheinfo))
4718 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4719}
c5396a31 4720
1da177e4 4721static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4722 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4723{
1da177e4 4724 struct nlmsghdr *nlh;
85486af0 4725 u32 preferred, valid;
1da177e4 4726
15e47304 4727 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4728 if (!nlh)
26932566 4729 return -EMSGSIZE;
0ab6803b 4730
101bb229
TG		 4731 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4732 ifa->idev->dev->ifindex);
4733
fad8da3e
YA		 4734 if (!((ifa->flags&IFA_F_PERMANENT) &&
4735 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4736 preferred = ifa->prefered_lft;
4737 valid = ifa->valid_lft;
4738 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4739 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4740 if (preferred > tval)
4741 preferred -= tval;
4742 else
4743 preferred = 0;
f56619fc
BH		 4744 if (valid != INFINITY_LIFE_TIME) {
4745 if (valid > tval)
4746 valid -= tval;
4747 else
4748 valid = 0;
4749 }
1da177e4
LT		 4750 }
4751 } else {
85486af0
TG		 4752 preferred = INFINITY_LIFE_TIME;
4753 valid = INFINITY_LIFE_TIME;
4754 }
4755
7996c799 4756 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4757 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4758 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4759 goto error;
4760 } else
930345ea 4761 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4762 goto error;
4763
4764 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4765 goto error;
1da177e4 4766
479840ff
JP		 4767 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4768 goto error;
4769
053c095a
JB		 4770 nlmsg_end(skb, nlh);
4771 return 0;
caeaba79
ND		 4772
4773error:
4774 nlmsg_cancel(skb, nlh);
4775 return -EMSGSIZE;
1da177e4
LT		 4776}
4777
4778static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4779 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4780{
1da177e4 4781 struct nlmsghdr *nlh;
101bb229
TG		 4782 u8 scope = RT_SCOPE_UNIVERSE;
4783 int ifindex = ifmca->idev->dev->ifindex;
4784
4785 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4786 scope = RT_SCOPE_SITE;
1da177e4 4787
15e47304 4788 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4789 if (!nlh)
26932566 4790 return -EMSGSIZE;
85486af0 4791
0ab6803b 4792 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4793 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4794 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4795 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4796 nlmsg_cancel(skb, nlh);
4797 return -EMSGSIZE;
4798 }
85486af0 4799
053c095a
JB		 4800 nlmsg_end(skb, nlh);
4801 return 0;
1da177e4
LT		 4802}
4803
4804static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4805 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4806{
1da177e4 4807 struct nlmsghdr *nlh;
101bb229
TG		 4808 u8 scope = RT_SCOPE_UNIVERSE;
4809 int ifindex = ifaca->aca_idev->dev->ifindex;
4810
4811 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4812 scope = RT_SCOPE_SITE;
1da177e4 4813
15e47304 4814 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4815 if (!nlh)
26932566 4816 return -EMSGSIZE;
85486af0 4817
0ab6803b 4818 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4819 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4820 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4821 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4822 nlmsg_cancel(skb, nlh);
4823 return -EMSGSIZE;
4824 }
1da177e4 4825
053c095a
JB		 4826 nlmsg_end(skb, nlh);
4827 return 0;
1da177e4
LT		 4828}
4829
e21e8467 4830enum addr_type_t {
1da177e4
LT		 4831 UNICAST_ADDR,
4832 MULTICAST_ADDR,
4833 ANYCAST_ADDR,
4834};
4835
234b27c3
ED		 4836/* called with rcu_read_lock() */
4837static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4838 struct netlink_callback *cb, enum addr_type_t type,
4839 int s_ip_idx, int *p_ip_idx)
4840{
234b27c3
ED		 4841 struct ifmcaddr6 *ifmca;
4842 struct ifacaddr6 *ifaca;
4843 int err = 1;
4844 int ip_idx = *p_ip_idx;
4845
4846 read_lock_bh(&idev->lock);
4847 switch (type) {
502a2ffd 4848 case UNICAST_ADDR: {
4849 struct inet6_ifaddr *ifa;
4850
234b27c3 4851 /* unicast address incl. temp addr */
502a2ffd 4852 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4853 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4854 continue;
4855 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4856 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4857 cb->nlh->nlmsg_seq,
4858 RTM_NEWADDR,
4859 NLM_F_MULTI);
053c095a 4860 if (err < 0)
234b27c3 4861 break;
63998ac2 4862 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4863 }
4864 break;
502a2ffd 4865 }
234b27c3
ED		 4866 case MULTICAST_ADDR:
4867 /* multicast address */
4868 for (ifmca = idev->mc_list; ifmca;
4869 ifmca = ifmca->next, ip_idx++) {
4870 if (ip_idx < s_ip_idx)
4871 continue;
4872 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4873 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4874 cb->nlh->nlmsg_seq,
4875 RTM_GETMULTICAST,
4876 NLM_F_MULTI);
053c095a 4877 if (err < 0)
234b27c3
ED		 4878 break;
4879 }
4880 break;
4881 case ANYCAST_ADDR:
4882 /* anycast address */
4883 for (ifaca = idev->ac_list; ifaca;
4884 ifaca = ifaca->aca_next, ip_idx++) {
4885 if (ip_idx < s_ip_idx)
4886 continue;
4887 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4888 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4889 cb->nlh->nlmsg_seq,
4890 RTM_GETANYCAST,
4891 NLM_F_MULTI);
053c095a 4892 if (err < 0)
234b27c3
ED		 4893 break;
4894 }
4895 break;
4896 default:
4897 break;
4898 }
4899 read_unlock_bh(&idev->lock);
4900 *p_ip_idx = ip_idx;
4901 return err;
4902}
4903
1da177e4
LT		 4904static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4905 enum addr_type_t type)
4906{
234b27c3
ED		 4907 struct net *net = sock_net(skb->sk);
4908 int h, s_h;
1da177e4
LT		 4909 int idx, ip_idx;
4910 int s_idx, s_ip_idx;
1da177e4 4911 struct net_device *dev;
234b27c3
ED		 4912 struct inet6_dev *idev;
4913 struct hlist_head *head;
1ab1457c 4914
234b27c3
ED		 4915 s_h = cb->args[0];
4916 s_idx = idx = cb->args[1];
4917 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4918
234b27c3 4919 rcu_read_lock();
63998ac2 4920 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4921 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4922 idx = 0;
4923 head = &net->dev_index_head[h];
b67bfe0d 4924 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4925 if (idx < s_idx)
4926 goto cont;
4b97efdf 4927 if (h > s_h || idx > s_idx)
234b27c3
ED		 4928 s_ip_idx = 0;
4929 ip_idx = 0;
e21e8467
SH		 4930 idev = __in6_dev_get(dev);
4931 if (!idev)
234b27c3
ED		 4932 goto cont;
4933
4934 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4935 s_ip_idx, &ip_idx) < 0)
234b27c3 4936 goto done;
7562f876 4937cont:
234b27c3
ED		 4938 idx++;
4939 }
1da177e4 4940 }
234b27c3
ED		 4941done:
4942 rcu_read_unlock();
4943 cb->args[0] = h;
4944 cb->args[1] = idx;
4945 cb->args[2] = ip_idx;
4946
1da177e4
LT		 4947 return skb->len;
4948}
4949
4950static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4951{
4952 enum addr_type_t type = UNICAST_ADDR;
b854272b 4953
1da177e4
LT		 4954 return inet6_dump_addr(skb, cb, type);
4955}
4956
4957static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4958{
4959 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4960
1da177e4
LT		 4961 return inet6_dump_addr(skb, cb, type);
4962}
4963
4964
4965static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4966{
4967 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4968
1da177e4
LT		 4969 return inet6_dump_addr(skb, cb, type);
4970}
4971
c21ef3e3
DA		 4972static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4973 struct netlink_ext_ack *extack)
6c223828 4974{
3b1e0a65 4975 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4976 struct ifaddrmsg *ifm;
4977 struct nlattr *tb[IFA_MAX+1];
caeaba79 4978 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4979 struct net_device *dev = NULL;
4980 struct inet6_ifaddr *ifa;
4981 struct sk_buff *skb;
6c223828
NT		 4982 int err;
4983
fceb6435 4984 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4985 extack);
1b29fc2c 4986 if (err < 0)
c24675f8 4987 return err;
1b29fc2c 4988
caeaba79 4989 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
c24675f8
FW		 4990 if (!addr)
4991 return -EINVAL;
6c223828 4992
1b29fc2c 4993 ifm = nlmsg_data(nlh);
6c223828 4994 if (ifm->ifa_index)
c24675f8 4995 dev = dev_get_by_index(net, ifm->ifa_index);
6c223828 4996
e21e8467
SH		 4997 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4998 if (!ifa) {
1b29fc2c
TG		 4999 err = -EADDRNOTAVAIL;
5000 goto errout;
5001 }
6c223828 5002
e21e8467
SH		 5003 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5004 if (!skb) {
6c223828 5005 err = -ENOBUFS;
1b29fc2c 5006 goto errout_ifa;
6c223828
NT		 5007 }
5008
15e47304 5009 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 5010 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 5011 if (err < 0) {
5012 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5013 WARN_ON(err == -EMSGSIZE);
5014 kfree_skb(skb);
5015 goto errout_ifa;
5016 }
15e47304 5017 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 5018errout_ifa:
6c223828 5019 in6_ifa_put(ifa);
1b29fc2c 5020errout:
c24675f8
FW		 5021 if (dev)
5022 dev_put(dev);
6c223828 5023 return err;
6c223828
NT		 5024}
5025
1da177e4
LT		 5026static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5027{
5028 struct sk_buff *skb;
c346dca1 5029 struct net *net = dev_net(ifa->idev->dev);
5d620266 5030 int err = -ENOBUFS;
1da177e4 5031
f784ad3d
MB		 5032 /* Don't send DELADDR notification for TENTATIVE address,
5033 * since NEWADDR notification is sent only after removing
6819a14e 5034 * TENTATIVE flag, if DAD has not failed.
f784ad3d 5035 */
6819a14e
MM		 5036 if (ifa->flags & IFA_F_TENTATIVE && !(ifa->flags & IFA_F_DADFAILED) &&
5037 event == RTM_DELADDR)
f784ad3d
MB		 5038 return;
5039
0ab6803b 5040 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 5041 if (!skb)
5d620266
TG		 5042 goto errout;
5043
5044 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 5045 if (err < 0) {
5046 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5047 WARN_ON(err == -EMSGSIZE);
5048 kfree_skb(skb);
5049 goto errout;
5050 }
1ce85fe4
PNA		 5051 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5052 return;
5d620266
TG		 5053errout:
5054 if (err < 0)
6fda7350 5055 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 5056}
5057
b6f99a21 5058static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 5059 __s32 *array, int bytes)
5060{
04561c1f
TG		 5061 BUG_ON(bytes < (DEVCONF_MAX * 4));
5062
1da177e4
LT		 5063 memset(array, 0, bytes);
5064 array[DEVCONF_FORWARDING] = cnf->forwarding;
5065 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5066 array[DEVCONF_MTU6] = cnf->mtu6;
5067 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5068 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5069 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5070 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5071 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 5072 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5073 jiffies_to_msecs(cnf->rtr_solicit_interval);
bd11f074
MŻ		 5074 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5075 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
93908d19
TG		 5076 array[DEVCONF_RTR_SOLICIT_DELAY] =
5077 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 5078 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 5079 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5080 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5081 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5082 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 5083 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5084 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5085 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5086 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5087 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 5088 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 5089 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 5090 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 5091 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 5092#ifdef CONFIG_IPV6_ROUTER_PREF
5093 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 5094 array[DEVCONF_RTR_PROBE_INTERVAL] =
5095 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 5096#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 5097 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
09c884d4
YH		 5098 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5099#endif
930d6ff2 5100#endif
fbea49e1 5101 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 5102 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 5103#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5104 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 5105 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 5106#endif
7bc570c8
YH		 5107#ifdef CONFIG_IPV6_MROUTE
5108 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5109#endif
778d80be 5110 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 5111 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 5112 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 5113 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 5114 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 5115 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 5116 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 5117 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 5118 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 5119 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 5120 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 5121 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 5122 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1ababeba 5123 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
bf355b8d
DL		 5124#ifdef CONFIG_IPV6_SEG6_HMAC
5125 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5126#endif
adc176c5 5127 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
d35a00b8 5128 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
df789fe7 5129 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
2210d6b2 5130 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
1da177e4
LT		 5131}
5132
b382b191
TG		 5133static inline size_t inet6_ifla6_size(void)
5134{
5135 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5136 + nla_total_size(sizeof(struct ifla_cacheinfo))
5137 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5138 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 5139 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5140 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 5141}
5142
339bf98f
TG		 5143static inline size_t inet6_if_nlmsg_size(void)
5144{
5145 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5146 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5147 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5148 + nla_total_size(4) /* IFLA_MTU */
5149 + nla_total_size(4) /* IFLA_LINK */
0344338b 5150 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 5151 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 5152}
c5396a31 5153
be281e55 5154static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
aca05671 5155 int bytes)
7f7d9a6b
HX		 5156{
5157 int i;
aca05671 5158 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
7f7d9a6b
HX		 5159 BUG_ON(pad < 0);
5160
5161 /* Use put_unaligned() because stats may not be aligned for u64. */
aca05671
JH		 5162 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5163 for (i = 1; i < ICMP6_MIB_MAX; i++)
be281e55 5164 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b 5165
aca05671 5166 memset(&stats[ICMP6_MIB_MAX], 0, pad);
7f7d9a6b
HX		 5167}
5168
698365fa 5169static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 5170 int bytes, size_t syncpoff)
4ce3c183 5171{
a3a77372
R		 5172 int i, c;
5173 u64 buff[IPSTATS_MIB_MAX];
5174 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5175
4ce3c183
ED		 5176 BUG_ON(pad < 0);
5177
a3a77372
R		 5178 memset(buff, 0, sizeof(buff));
5179 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 5180
a3a77372
R		 5181 for_each_possible_cpu(c) {
5182 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5183 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5184 }
5185
5186 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5187 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 5188}
5189
7f7d9a6b
HX		 5190static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5191 int bytes)
5192{
e21e8467 5193 switch (attrtype) {
7f7d9a6b 5194 case IFLA_INET6_STATS:
a3a77372
R		 5195 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5196 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 5197 break;
5198 case IFLA_INET6_ICMP6STATS:
aca05671 5199 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
7f7d9a6b
HX		 5200 break;
5201 }
5202}
5203
d5566fd7
SV		 5204static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5205 u32 ext_filter_mask)
b382b191
TG		 5206{
5207 struct nlattr *nla;
5208 struct ifla_cacheinfo ci;
5209
c78679e8
DM		 5210 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5211 goto nla_put_failure;
b382b191 5212 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 5213 ci.tstamp = cstamp_delta(idev->tstamp);
5214 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 5215 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 5216 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5217 goto nla_put_failure;
b382b191 5218 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 5219 if (!nla)
b382b191
TG		 5220 goto nla_put_failure;
5221 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5222
5223 /* XXX - MC not implemented */
5224
d5566fd7
SV		 5225 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5226 return 0;
5227
b382b191 5228 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 5229 if (!nla)
b382b191
TG		 5230 goto nla_put_failure;
5231 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5232
5233 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 5234 if (!nla)
b382b191
TG		 5235 goto nla_put_failure;
5236 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5237
f53adae4 5238 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 5239 if (!nla)
f53adae4 5240 goto nla_put_failure;
bc91b0f0 5241
d35a00b8 5242 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
bc91b0f0
JP		 5243 goto nla_put_failure;
5244
f53adae4
DB		 5245 read_lock_bh(&idev->lock);
5246 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5247 read_unlock_bh(&idev->lock);
5248
b382b191
TG		 5249 return 0;
5250
5251nla_put_failure:
5252 return -EMSGSIZE;
5253}
5254
b1974ed0
AR		 5255static size_t inet6_get_link_af_size(const struct net_device *dev,
5256 u32 ext_filter_mask)
b382b191
TG		 5257{
5258 if (!__in6_dev_get(dev))
5259 return 0;
5260
5261 return inet6_ifla6_size();
5262}
5263
d5566fd7
SV		 5264static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5265 u32 ext_filter_mask)
b382b191
TG		 5266{
5267 struct inet6_dev *idev = __in6_dev_get(dev);
5268
5269 if (!idev)
5270 return -ENODATA;
5271
d5566fd7 5272 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5273 return -EMSGSIZE;
5274
5275 return 0;
5276}
5277
f53adae4
DB		 5278static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5279{
f53adae4
DB		 5280 struct inet6_ifaddr *ifp;
5281 struct net_device *dev = idev->dev;
47e27d5e 5282 bool clear_token, update_rs = false;
dc848292 5283 struct in6_addr ll_addr;
f53adae4 5284
c15b1cca
HFS		 5285 ASSERT_RTNL();
5286
63159f29 5287 if (!token)
f53adae4 5288 return -EINVAL;
f53adae4
DB		 5289 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5290 return -EINVAL;
f53adae4
DB		 5291 if (!ipv6_accept_ra(idev))
5292 return -EINVAL;
bd11f074 5293 if (idev->cnf.rtr_solicits == 0)
f53adae4
DB		 5294 return -EINVAL;
5295
5296 write_lock_bh(&idev->lock);
5297
5298 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5299 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5300
5301 write_unlock_bh(&idev->lock);
5302
47e27d5e
DB		 5303 clear_token = ipv6_addr_any(token);
5304 if (clear_token)
5305 goto update_lft;
5306
dc848292
HFS		 5307 if (!idev->dead && (idev->if_flags & IF_READY) &&
5308 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5309 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5310 /* If we're not ready, then normal ifup will take care
5311 * of this. Otherwise, we need to request our rs here.
5312 */
5313 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5314 update_rs = true;
5315 }
f53adae4 5316
47e27d5e 5317update_lft:
f53adae4 5318 write_lock_bh(&idev->lock);
fc403832 5319
77ecaace 5320 if (update_rs) {
fc403832 5321 idev->if_flags |= IF_RS_SENT;
bd11f074
MŻ		 5322 idev->rs_interval = rfc3315_s14_backoff_init(
5323 idev->cnf.rtr_solicit_interval);
77ecaace 5324 idev->rs_probes = 1;
bd11f074 5325 addrconf_mod_rs_timer(idev, idev->rs_interval);
77ecaace 5326 }
f53adae4
DB		 5327
5328 /* Well, that's kinda nasty ... */
5329 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5330 spin_lock(&ifp->lock);
617fe29d 5331 if (ifp->tokenized) {
f53adae4
DB		 5332 ifp->valid_lft = 0;
5333 ifp->prefered_lft = 0;
5334 }
5335 spin_unlock(&ifp->lock);
5336 }
5337
5338 write_unlock_bh(&idev->lock);
b2ed64a9 5339 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 5340 addrconf_verify_rtnl();
f53adae4
DB		 5341 return 0;
5342}
5343
11b1f828
DB		 5344static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5345 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5346 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5347};
5348
5349static int inet6_validate_link_af(const struct net_device *dev,
5350 const struct nlattr *nla)
5351{
5352 struct nlattr *tb[IFLA_INET6_MAX + 1];
5353
5354 if (dev && !__in6_dev_get(dev))
5355 return -EAFNOSUPPORT;
5356
fceb6435
JB		 5357 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5358 NULL);
11b1f828
DB		 5359}
5360
d35a00b8
FJ		 5361static int check_addr_gen_mode(int mode)
5362{
5363 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5364 mode != IN6_ADDR_GEN_MODE_NONE &&
5365 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5366 mode != IN6_ADDR_GEN_MODE_RANDOM)
5367 return -EINVAL;
5368 return 1;
5369}
5370
5371static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5372 int mode)
5373{
5374 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5375 !idev->cnf.stable_secret.initialized &&
5376 !net->ipv6.devconf_dflt->stable_secret.initialized)
5377 return -EINVAL;
5378 return 1;
5379}
5380
f53adae4
DB		 5381static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5382{
5383 int err = -EINVAL;
5384 struct inet6_dev *idev = __in6_dev_get(dev);
5385 struct nlattr *tb[IFLA_INET6_MAX + 1];
5386
5387 if (!idev)
5388 return -EAFNOSUPPORT;
5389
fceb6435 5390 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
f53adae4
DB		 5391 BUG();
5392
bc91b0f0 5393 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 5394 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 5395 if (err)
5396 return err;
5397 }
5398
5399 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5400 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5401
d35a00b8
FJ		 5402 if (check_addr_gen_mode(mode) < 0 ||
5403 check_stable_privacy(idev, dev_net(dev), mode) < 0)
bc91b0f0 5404 return -EINVAL;
622c81d5 5405
d35a00b8 5406 idev->cnf.addr_gen_mode = mode;
bc91b0f0
JP		 5407 err = 0;
5408 }
f53adae4
DB		 5409
5410 return err;
5411}
5412
1ab1457c 5413static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5414 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5415{
04561c1f 5416 struct net_device *dev = idev->dev;
04561c1f
TG		 5417 struct ifinfomsg *hdr;
5418 struct nlmsghdr *nlh;
5419 void *protoinfo;
04561c1f 5420
15e47304 5421 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5422 if (!nlh)
26932566 5423 return -EMSGSIZE;
04561c1f
TG		 5424
5425 hdr = nlmsg_data(nlh);
5426 hdr->ifi_family = AF_INET6;
5427 hdr->__ifi_pad = 0;
5428 hdr->ifi_type = dev->type;
5429 hdr->ifi_index = dev->ifindex;
5430 hdr->ifi_flags = dev_get_flags(dev);
5431 hdr->ifi_change = 0;
5432
c78679e8
DM		 5433 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5434 (dev->addr_len &&
5435 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5436 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5437 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5438 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5439 nla_put_u8(skb, IFLA_OPERSTATE,
5440 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5441 goto nla_put_failure;
04561c1f 5442 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 5443 if (!protoinfo)
04561c1f 5444 goto nla_put_failure;
1da177e4 5445
d5566fd7 5446 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5447 goto nla_put_failure;
1da177e4 5448
04561c1f 5449 nla_nest_end(skb, protoinfo);
053c095a
JB		 5450 nlmsg_end(skb, nlh);
5451 return 0;
1da177e4 5452
04561c1f 5453nla_put_failure:
26932566
PM		 5454 nlmsg_cancel(skb, nlh);
5455 return -EMSGSIZE;
1da177e4
LT		 5456}
5457
5458static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5459{
3b1e0a65 5460 struct net *net = sock_net(skb->sk);
84d2697d 5461 int h, s_h;
434a8a58 5462 int idx = 0, s_idx;
1da177e4
LT		 5463 struct net_device *dev;
5464 struct inet6_dev *idev;
84d2697d 5465 struct hlist_head *head;
1da177e4 5466
84d2697d
ED		 5467 s_h = cb->args[0];
5468 s_idx = cb->args[1];
5469
5470 rcu_read_lock();
5471 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5472 idx = 0;
5473 head = &net->dev_index_head[h];
b67bfe0d 5474 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5475 if (idx < s_idx)
5476 goto cont;
5477 idev = __in6_dev_get(dev);
5478 if (!idev)
5479 goto cont;
5480 if (inet6_fill_ifinfo(skb, idev,
15e47304 5481 NETLINK_CB(cb->skb).portid,
84d2697d 5482 cb->nlh->nlmsg_seq,
053c095a 5483 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5484 goto out;
7562f876 5485cont:
84d2697d
ED		 5486 idx++;
5487 }
1da177e4 5488 }
84d2697d
ED		 5489out:
5490 rcu_read_unlock();
5491 cb->args[1] = idx;
5492 cb->args[0] = h;
1da177e4
LT		 5493
5494 return skb->len;
5495}
5496
5497void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5498{
5499 struct sk_buff *skb;
c346dca1 5500 struct net *net = dev_net(idev->dev);
8d7a76c9 5501 int err = -ENOBUFS;
1ab1457c 5502
339bf98f 5503 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5504 if (!skb)
8d7a76c9
TG		 5505 goto errout;
5506
5507 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5508 if (err < 0) {
5509 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5510 WARN_ON(err == -EMSGSIZE);
5511 kfree_skb(skb);
5512 goto errout;
5513 }
5f75a104 5514 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5515 return;
8d7a76c9
TG		 5516errout:
5517 if (err < 0)
5f75a104 5518 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5519}
5520
339bf98f
TG		 5521static inline size_t inet6_prefix_nlmsg_size(void)
5522{
5523 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5524 + nla_total_size(sizeof(struct in6_addr))
5525 + nla_total_size(sizeof(struct prefix_cacheinfo));
5526}
c5396a31 5527
1da177e4 5528static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5529 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5530 int event, unsigned int flags)
1da177e4 5531{
6051e2f4
TG		 5532 struct prefixmsg *pmsg;
5533 struct nlmsghdr *nlh;
1da177e4
LT		 5534 struct prefix_cacheinfo ci;
5535
15e47304 5536 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5537 if (!nlh)
26932566 5538 return -EMSGSIZE;
6051e2f4
TG		 5539
5540 pmsg = nlmsg_data(nlh);
1da177e4 5541 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5542 pmsg->prefix_pad1 = 0;
5543 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5544 pmsg->prefix_ifindex = idev->dev->ifindex;
5545 pmsg->prefix_len = pinfo->prefix_len;
5546 pmsg->prefix_type = pinfo->type;
8a47077a 5547 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5548 pmsg->prefix_flags = 0;
5549 if (pinfo->onlink)
5550 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5551 if (pinfo->autoconf)
5552 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5553
c78679e8
DM		 5554 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5555 goto nla_put_failure;
1da177e4
LT		 5556 ci.preferred_time = ntohl(pinfo->prefered);
5557 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5558 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5559 goto nla_put_failure;
053c095a
JB		 5560 nlmsg_end(skb, nlh);
5561 return 0;
1da177e4 5562
6051e2f4 5563nla_put_failure:
26932566
PM		 5564 nlmsg_cancel(skb, nlh);
5565 return -EMSGSIZE;
1da177e4
LT		 5566}
5567
1ab1457c 5568static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5569 struct prefix_info *pinfo)
5570{
5571 struct sk_buff *skb;
c346dca1 5572 struct net *net = dev_net(idev->dev);
8c384bfa 5573 int err = -ENOBUFS;
1da177e4 5574
339bf98f 5575 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5576 if (!skb)
8c384bfa
TG		 5577 goto errout;
5578
5579 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5580 if (err < 0) {
5581 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5582 WARN_ON(err == -EMSGSIZE);
5583 kfree_skb(skb);
5584 goto errout;
5585 }
1ce85fe4
PNA		 5586 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5587 return;
8c384bfa
TG		 5588errout:
5589 if (err < 0)
6fda7350 5590 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5591}
5592
1da177e4
LT		 5593static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5594{
63998ac2
ND		 5595 struct net *net = dev_net(ifp->idev->dev);
5596
c15b1cca
HFS		 5597 if (event)
5598 ASSERT_RTNL();
5599
1da177e4
LT		 5600 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5601
5602 switch (event) {
5603 case RTM_NEWADDR:
95c385b4
NH		 5604 /*
5605 * If the address was optimistic
5606 * we inserted the route at the start of
5607 * our DAD process, so we don't need
5608 * to do it again
5609 */
4e587ea7 5610 if (!rcu_access_pointer(ifp->rt->rt6i_node))
95c385b4 5611 ip6_ins_rt(ifp->rt);
1da177e4
LT		 5612 if (ifp->idev->cnf.forwarding)
5613 addrconf_join_anycast(ifp);
7996c799 5614 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 5615 addrconf_prefix_route(&ifp->peer_addr, 128,
5616 ifp->idev->dev, 0, 0);
1da177e4
LT		 5617 break;
5618 case RTM_DELADDR:
5619 if (ifp->idev->cnf.forwarding)
5620 addrconf_leave_anycast(ifp);
5621 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5622 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 5623 struct rt6_info *rt;
caeaba79 5624
e7478dfc
ND		 5625 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5626 ifp->idev->dev, 0, 0);
8e3d5be7
MKL		 5627 if (rt)
5628 ip6_del_rt(rt);
caeaba79 5629 }
38bd10c4 5630 if (ifp->rt) {
ad65a2f0
WW		 5631 if (dst_hold_safe(&ifp->rt->dst))
5632 ip6_del_rt(ifp->rt);
38bd10c4 5633 }
705f1c86 5634 rt_genid_bump_ipv6(net);
1da177e4
LT		 5635 break;
5636 }
63998ac2 5637 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5638}
5639
5640static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5641{
8814c4b5 5642 rcu_read_lock_bh();
1da177e4
LT		 5643 if (likely(ifp->idev->dead == 0))
5644 __ipv6_ifa_notify(event, ifp);
8814c4b5 5645 rcu_read_unlock_bh();
1da177e4
LT		 5646}
5647
5648#ifdef CONFIG_SYSCTL
5649
5650static
fe2c6338 5651int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5652 void __user *buffer, size_t *lenp, loff_t *ppos)
5653{
5654 int *valp = ctl->data;
5655 int val = *valp;
88af182e 5656 loff_t pos = *ppos;
fe2c6338 5657 struct ctl_table lctl;
1da177e4
LT		 5658 int ret;
5659
013d97e9
FR		 5660 /*
5661 * ctl->data points to idev->cnf.forwarding, we should
5662 * not modify it until we get the rtnl lock.
5663 */
5664 lctl = *ctl;
5665 lctl.data = &val;
5666
5667 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5668
c8fecf22 5669 if (write)
b325fddb 5670 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5671 if (ret)
5672 *ppos = pos;
1ab1457c 5673 return ret;
1da177e4
LT		 5674}
5675
77751427
ML		 5676static
5677int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5678 void __user *buffer, size_t *lenp, loff_t *ppos)
5679{
5680 struct inet6_dev *idev = ctl->extra1;
5681 int min_mtu = IPV6_MIN_MTU;
5682 struct ctl_table lctl;
5683
5684 lctl = *ctl;
5685 lctl.extra1 = &min_mtu;
5686 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5687
5688 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5689}
5690
56d417b1
BH		 5691static void dev_disable_change(struct inet6_dev *idev)
5692{
75538c2b
CW		 5693 struct netdev_notifier_info info;
5694
56d417b1
BH		 5695 if (!idev || !idev->dev)
5696 return;
5697
75538c2b 5698 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5699 if (idev->cnf.disable_ipv6)
75538c2b 5700 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5701 else
75538c2b 5702 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5703}
5704
5705static void addrconf_disable_change(struct net *net, __s32 newf)
5706{
5707 struct net_device *dev;
5708 struct inet6_dev *idev;
5709
03e4deff 5710 for_each_netdev(net, dev) {
56d417b1
BH		 5711 idev = __in6_dev_get(dev);
5712 if (idev) {
5713 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5714 idev->cnf.disable_ipv6 = newf;
5715 if (changed)
5716 dev_disable_change(idev);
5717 }
56d417b1 5718 }
56d417b1
BH		 5719}
5720
013d97e9 5721static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5722{
5723 struct net *net;
013d97e9
FR		 5724 int old;
5725
5726 if (!rtnl_trylock())
5727 return restart_syscall();
56d417b1
BH		 5728
5729 net = (struct net *)table->extra2;
013d97e9
FR		 5730 old = *p;
5731 *p = newf;
56d417b1 5732
013d97e9
FR		 5733 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5734 rtnl_unlock();
56d417b1 5735 return 0;
88af182e 5736 }
56d417b1
BH		 5737
5738 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5739 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5740 addrconf_disable_change(net, newf);
013d97e9 5741 } else if ((!newf) ^ (!old))
56d417b1
BH		 5742 dev_disable_change((struct inet6_dev *)table->extra1);
5743
5744 rtnl_unlock();
5745 return 0;
5746}
5747
5748static
fe2c6338 5749int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5750 void __user *buffer, size_t *lenp, loff_t *ppos)
5751{
5752 int *valp = ctl->data;
5753 int val = *valp;
88af182e 5754 loff_t pos = *ppos;
fe2c6338 5755 struct ctl_table lctl;
56d417b1
BH		 5756 int ret;
5757
013d97e9
FR		 5758 /*
5759 * ctl->data points to idev->cnf.disable_ipv6, we should
5760 * not modify it until we get the rtnl lock.
5761 */
5762 lctl = *ctl;
5763 lctl.data = &val;
5764
5765 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5766
5767 if (write)
5768 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5769 if (ret)
5770 *ppos = pos;
56d417b1
BH		 5771 return ret;
5772}
5773
c92d5491 5774static
5775int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5776 void __user *buffer, size_t *lenp, loff_t *ppos)
5777{
5778 int *valp = ctl->data;
5779 int ret;
5780 int old, new;
5781
5782 old = *valp;
5783 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5784 new = *valp;
5785
5786 if (write && old != new) {
5787 struct net *net = ctl->extra2;
5788
5789 if (!rtnl_trylock())
5790 return restart_syscall();
5791
5792 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
85b3daad
DA		 5793 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5794 NETCONFA_PROXY_NEIGH,
c92d5491 5795 NETCONFA_IFINDEX_DEFAULT,
5796 net->ipv6.devconf_dflt);
5797 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
85b3daad
DA		 5798 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5799 NETCONFA_PROXY_NEIGH,
c92d5491 5800 NETCONFA_IFINDEX_ALL,
5801 net->ipv6.devconf_all);
5802 else {
5803 struct inet6_dev *idev = ctl->extra1;
5804
85b3daad
DA		 5805 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5806 NETCONFA_PROXY_NEIGH,
c92d5491 5807 idev->dev->ifindex,
5808 &idev->cnf);
5809 }
5810 rtnl_unlock();
5811 }
5812
5813 return ret;
5814}
5815
d35a00b8
FJ		 5816static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5817 void __user *buffer, size_t *lenp,
5818 loff_t *ppos)
5819{
5820 int ret = 0;
5821 int new_val;
5822 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5823 struct net *net = (struct net *)ctl->extra2;
5824
8c171d6c
FJ		 5825 if (!rtnl_trylock())
5826 return restart_syscall();
5827
d35a00b8
FJ		 5828 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5829
5830 if (write) {
5831 new_val = *((int *)ctl->data);
5832
8c171d6c
FJ		 5833 if (check_addr_gen_mode(new_val) < 0) {
5834 ret = -EINVAL;
5835 goto out;
5836 }
d35a00b8
FJ		 5837
5838 /* request for default */
5839 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5840 ipv6_devconf_dflt.addr_gen_mode = new_val;
5841
5842 /* request for individual net device */
5843 } else {
5844 if (!idev)
8c171d6c 5845 goto out;
d35a00b8 5846
8c171d6c
FJ		 5847 if (check_stable_privacy(idev, net, new_val) < 0) {
5848 ret = -EINVAL;
5849 goto out;
5850 }
d35a00b8
FJ		 5851
5852 if (idev->cnf.addr_gen_mode != new_val) {
5853 idev->cnf.addr_gen_mode = new_val;
d35a00b8 5854 addrconf_dev_config(idev->dev);
d35a00b8
FJ		 5855 }
5856 }
5857 }
5858
8c171d6c
FJ		 5859out:
5860 rtnl_unlock();
5861
d35a00b8
FJ		 5862 return ret;
5863}
5864
3d1bec99
HFS		 5865static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5866 void __user *buffer, size_t *lenp,
5867 loff_t *ppos)
5868{
5869 int err;
5870 struct in6_addr addr;
5871 char str[IPV6_MAX_STRLEN];
5872 struct ctl_table lctl = *ctl;
622c81d5 5873 struct net *net = ctl->extra2;
3d1bec99
HFS		 5874 struct ipv6_stable_secret *secret = ctl->data;
5875
622c81d5
HFS		 5876 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5877 return -EIO;
5878
3d1bec99
HFS		 5879 lctl.maxlen = IPV6_MAX_STRLEN;
5880 lctl.data = str;
5881
5882 if (!rtnl_trylock())
5883 return restart_syscall();
5884
5885 if (!write && !secret->initialized) {
5886 err = -EIO;
5887 goto out;
5888 }
5889
5449a5ca
WC		 5890 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5891 if (err >= sizeof(str)) {
5892 err = -EIO;
5893 goto out;
3d1bec99
HFS		 5894 }
5895
5896 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5897 if (err || !write)
5898 goto out;
5899
5900 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5901 err = -EIO;
5902 goto out;
5903 }
5904
5905 secret->initialized = true;
5906 secret->secret = addr;
5907
622c81d5
HFS		 5908 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5909 struct net_device *dev;
5910
5911 for_each_netdev(net, dev) {
5912 struct inet6_dev *idev = __in6_dev_get(dev);
5913
5914 if (idev) {
d35a00b8 5915 idev->cnf.addr_gen_mode =
622c81d5
HFS		 5916 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5917 }
5918 }
5919 } else {
5920 struct inet6_dev *idev = ctl->extra1;
5921
d35a00b8 5922 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
622c81d5
HFS		 5923 }
5924
3d1bec99
HFS		 5925out:
5926 rtnl_unlock();
5927
5928 return err;
5929}
c92d5491 5930
35103d11
AG		 5931static
5932int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5933 int write,
5934 void __user *buffer,
5935 size_t *lenp,
5936 loff_t *ppos)
5937{
5938 int *valp = ctl->data;
5939 int val = *valp;
5940 loff_t pos = *ppos;
5941 struct ctl_table lctl;
5942 int ret;
5943
5944 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5945 * we should not modify it until we get the rtnl lock.
5946 */
5947 lctl = *ctl;
5948 lctl.data = &val;
5949
5950 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5951
5952 if (write)
5953 ret = addrconf_fixup_linkdown(ctl, valp, val);
5954 if (ret)
5955 *ppos = pos;
5956 return ret;
5957}
5958
df789fe7
DF		 5959static
5960void addrconf_set_nopolicy(struct rt6_info *rt, int action)
5961{
5962 if (rt) {
5963 if (action)
5964 rt->dst.flags |= DST_NOPOLICY;
5965 else
5966 rt->dst.flags &= ~DST_NOPOLICY;
5967 }
5968}
5969
5970static
5971void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
5972{
5973 struct inet6_ifaddr *ifa;
5974
5975 read_lock_bh(&idev->lock);
5976 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5977 spin_lock(&ifa->lock);
5978 if (ifa->rt) {
5979 struct rt6_info *rt = ifa->rt;
df789fe7
DF		 5980 int cpu;
5981
66f5d6ce 5982 rcu_read_lock();
df789fe7
DF		 5983 addrconf_set_nopolicy(ifa->rt, val);
5984 if (rt->rt6i_pcpu) {
5985 for_each_possible_cpu(cpu) {
5986 struct rt6_info **rtp;
5987
5988 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
5989 addrconf_set_nopolicy(*rtp, val);
5990 }
5991 }
66f5d6ce 5992 rcu_read_unlock();
df789fe7
DF		 5993 }
5994 spin_unlock(&ifa->lock);
5995 }
5996 read_unlock_bh(&idev->lock);
5997}
5998
5999static
6000int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6001{
6002 struct inet6_dev *idev;
6003 struct net *net;
6004
6005 if (!rtnl_trylock())
6006 return restart_syscall();
6007
6008 *valp = val;
6009
6010 net = (struct net *)ctl->extra2;
6011 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6012 rtnl_unlock();
6013 return 0;
6014 }
6015
6016 if (valp == &net->ipv6.devconf_all->disable_policy) {
6017 struct net_device *dev;
6018
6019 for_each_netdev(net, dev) {
6020 idev = __in6_dev_get(dev);
6021 if (idev)
6022 addrconf_disable_policy_idev(idev, val);
6023 }
6024 } else {
6025 idev = (struct inet6_dev *)ctl->extra1;
6026 addrconf_disable_policy_idev(idev, val);
6027 }
6028
6029 rtnl_unlock();
6030 return 0;
6031}
6032
6033static
6034int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6035 void __user *buffer, size_t *lenp,
6036 loff_t *ppos)
6037{
6038 int *valp = ctl->data;
6039 int val = *valp;
6040 loff_t pos = *ppos;
6041 struct ctl_table lctl;
6042 int ret;
6043
6044 lctl = *ctl;
6045 lctl.data = &val;
6046 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6047
6048 if (write && (*valp != val))
6049 ret = addrconf_disable_policy(ctl, valp, val);
6050
6051 if (ret)
6052 *ppos = pos;
6053
6054 return ret;
6055}
6056
cb4a4c69 6057static int minus_one = -1;
2210d6b2 6058static const int zero = 0;
cb9e684e
MŻ		 6059static const int one = 1;
6060static const int two_five_five = 255;
6061
607ea7cd 6062static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 6063 {
6064 .procname = "forwarding",
6065 .data = &ipv6_devconf.forwarding,
6066 .maxlen = sizeof(int),
6067 .mode = 0644,
6068 .proc_handler = addrconf_sysctl_forward,
6069 },
6070 {
6071 .procname = "hop_limit",
6072 .data = &ipv6_devconf.hop_limit,
6073 .maxlen = sizeof(int),
6074 .mode = 0644,
cb9e684e
MŻ		 6075 .proc_handler = proc_dointvec_minmax,
6076 .extra1 = (void *)&one,
6077 .extra2 = (void *)&two_five_five,
5df1f77f
KK		 6078 },
6079 {
6080 .procname = "mtu",
6081 .data = &ipv6_devconf.mtu6,
6082 .maxlen = sizeof(int),
6083 .mode = 0644,
6084 .proc_handler = addrconf_sysctl_mtu,
6085 },
6086 {
6087 .procname = "accept_ra",
6088 .data = &ipv6_devconf.accept_ra,
6089 .maxlen = sizeof(int),
6090 .mode = 0644,
6091 .proc_handler = proc_dointvec,
6092 },
6093 {
6094 .procname = "accept_redirects",
6095 .data = &ipv6_devconf.accept_redirects,
6096 .maxlen = sizeof(int),
6097 .mode = 0644,
6098 .proc_handler = proc_dointvec,
6099 },
6100 {
6101 .procname = "autoconf",
6102 .data = &ipv6_devconf.autoconf,
6103 .maxlen = sizeof(int),
6104 .mode = 0644,
6105 .proc_handler = proc_dointvec,
6106 },
6107 {
6108 .procname = "dad_transmits",
6109 .data = &ipv6_devconf.dad_transmits,
6110 .maxlen = sizeof(int),
6111 .mode = 0644,
6112 .proc_handler = proc_dointvec,
6113 },
6114 {
6115 .procname = "router_solicitations",
6116 .data = &ipv6_devconf.rtr_solicits,
6117 .maxlen = sizeof(int),
6118 .mode = 0644,
cb4a4c69
MŻ		 6119 .proc_handler = proc_dointvec_minmax,
6120 .extra1 = &minus_one,
5df1f77f
KK		 6121 },
6122 {
6123 .procname = "router_solicitation_interval",
6124 .data = &ipv6_devconf.rtr_solicit_interval,
6125 .maxlen = sizeof(int),
6126 .mode = 0644,
6127 .proc_handler = proc_dointvec_jiffies,
6128 },
bd11f074
MŻ		 6129 {
6130 .procname = "router_solicitation_max_interval",
6131 .data = &ipv6_devconf.rtr_solicit_max_interval,
6132 .maxlen = sizeof(int),
6133 .mode = 0644,
6134 .proc_handler = proc_dointvec_jiffies,
6135 },
5df1f77f
KK		 6136 {
6137 .procname = "router_solicitation_delay",
6138 .data = &ipv6_devconf.rtr_solicit_delay,
6139 .maxlen = sizeof(int),
6140 .mode = 0644,
6141 .proc_handler = proc_dointvec_jiffies,
6142 },
6143 {
6144 .procname = "force_mld_version",
6145 .data = &ipv6_devconf.force_mld_version,
6146 .maxlen = sizeof(int),
6147 .mode = 0644,
6148 .proc_handler = proc_dointvec,
6149 },
6150 {
6151 .procname = "mldv1_unsolicited_report_interval",
6152 .data =
6153 &ipv6_devconf.mldv1_unsolicited_report_interval,
6154 .maxlen = sizeof(int),
6155 .mode = 0644,
6156 .proc_handler = proc_dointvec_ms_jiffies,
6157 },
6158 {
6159 .procname = "mldv2_unsolicited_report_interval",
6160 .data =
6161 &ipv6_devconf.mldv2_unsolicited_report_interval,
6162 .maxlen = sizeof(int),
6163 .mode = 0644,
6164 .proc_handler = proc_dointvec_ms_jiffies,
6165 },
6166 {
6167 .procname = "use_tempaddr",
6168 .data = &ipv6_devconf.use_tempaddr,
6169 .maxlen = sizeof(int),
6170 .mode = 0644,
6171 .proc_handler = proc_dointvec,
6172 },
6173 {
6174 .procname = "temp_valid_lft",
6175 .data = &ipv6_devconf.temp_valid_lft,
6176 .maxlen = sizeof(int),
6177 .mode = 0644,
6178 .proc_handler = proc_dointvec,
6179 },
6180 {
6181 .procname = "temp_prefered_lft",
6182 .data = &ipv6_devconf.temp_prefered_lft,
6183 .maxlen = sizeof(int),
6184 .mode = 0644,
6185 .proc_handler = proc_dointvec,
6186 },
6187 {
6188 .procname = "regen_max_retry",
6189 .data = &ipv6_devconf.regen_max_retry,
6190 .maxlen = sizeof(int),
6191 .mode = 0644,
6192 .proc_handler = proc_dointvec,
6193 },
6194 {
6195 .procname = "max_desync_factor",
6196 .data = &ipv6_devconf.max_desync_factor,
6197 .maxlen = sizeof(int),
6198 .mode = 0644,
6199 .proc_handler = proc_dointvec,
6200 },
6201 {
6202 .procname = "max_addresses",
6203 .data = &ipv6_devconf.max_addresses,
6204 .maxlen = sizeof(int),
6205 .mode = 0644,
6206 .proc_handler = proc_dointvec,
6207 },
6208 {
6209 .procname = "accept_ra_defrtr",
6210 .data = &ipv6_devconf.accept_ra_defrtr,
6211 .maxlen = sizeof(int),
6212 .mode = 0644,
6213 .proc_handler = proc_dointvec,
6214 },
6215 {
6216 .procname = "accept_ra_min_hop_limit",
6217 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6218 .maxlen = sizeof(int),
6219 .mode = 0644,
6220 .proc_handler = proc_dointvec,
6221 },
6222 {
6223 .procname = "accept_ra_pinfo",
6224 .data = &ipv6_devconf.accept_ra_pinfo,
6225 .maxlen = sizeof(int),
6226 .mode = 0644,
6227 .proc_handler = proc_dointvec,
6228 },
930d6ff2 6229#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 6230 {
6231 .procname = "accept_ra_rtr_pref",
6232 .data = &ipv6_devconf.accept_ra_rtr_pref,
6233 .maxlen = sizeof(int),
6234 .mode = 0644,
6235 .proc_handler = proc_dointvec,
6236 },
6237 {
6238 .procname = "router_probe_interval",
6239 .data = &ipv6_devconf.rtr_probe_interval,
6240 .maxlen = sizeof(int),
6241 .mode = 0644,
6242 .proc_handler = proc_dointvec_jiffies,
6243 },
fa03ef38 6244#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b
JS		 6245 {
6246 .procname = "accept_ra_rt_info_min_plen",
6247 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6248 .maxlen = sizeof(int),
6249 .mode = 0644,
6250 .proc_handler = proc_dointvec,
6251 },
5df1f77f
KK		 6252 {
6253 .procname = "accept_ra_rt_info_max_plen",
6254 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6255 .maxlen = sizeof(int),
6256 .mode = 0644,
6257 .proc_handler = proc_dointvec,
6258 },
09c884d4 6259#endif
930d6ff2 6260#endif
5df1f77f
KK		 6261 {
6262 .procname = "proxy_ndp",
6263 .data = &ipv6_devconf.proxy_ndp,
6264 .maxlen = sizeof(int),
6265 .mode = 0644,
6266 .proc_handler = addrconf_sysctl_proxy_ndp,
6267 },
6268 {
6269 .procname = "accept_source_route",
6270 .data = &ipv6_devconf.accept_source_route,
6271 .maxlen = sizeof(int),
6272 .mode = 0644,
6273 .proc_handler = proc_dointvec,
6274 },
95c385b4 6275#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 6276 {
6277 .procname = "optimistic_dad",
6278 .data = &ipv6_devconf.optimistic_dad,
6279 .maxlen = sizeof(int),
6280 .mode = 0644,
6281 .proc_handler = proc_dointvec,
6282 },
6283 {
6284 .procname = "use_optimistic",
6285 .data = &ipv6_devconf.use_optimistic,
6286 .maxlen = sizeof(int),
6287 .mode = 0644,
6288 .proc_handler = proc_dointvec,
6289 },
7bc570c8
YH		 6290#endif
6291#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 6292 {
6293 .procname = "mc_forwarding",
6294 .data = &ipv6_devconf.mc_forwarding,
6295 .maxlen = sizeof(int),
6296 .mode = 0444,
6297 .proc_handler = proc_dointvec,
6298 },
95c385b4 6299#endif
5df1f77f
KK		 6300 {
6301 .procname = "disable_ipv6",
6302 .data = &ipv6_devconf.disable_ipv6,
6303 .maxlen = sizeof(int),
6304 .mode = 0644,
6305 .proc_handler = addrconf_sysctl_disable,
6306 },
6307 {
6308 .procname = "accept_dad",
6309 .data = &ipv6_devconf.accept_dad,
6310 .maxlen = sizeof(int),
6311 .mode = 0644,
6312 .proc_handler = proc_dointvec,
6313 },
6314 {
6315 .procname = "force_tllao",
6316 .data = &ipv6_devconf.force_tllao,
6317 .maxlen = sizeof(int),
6318 .mode = 0644,
6319 .proc_handler = proc_dointvec
6320 },
6321 {
6322 .procname = "ndisc_notify",
6323 .data = &ipv6_devconf.ndisc_notify,
6324 .maxlen = sizeof(int),
6325 .mode = 0644,
6326 .proc_handler = proc_dointvec
6327 },
6328 {
6329 .procname = "suppress_frag_ndisc",
6330 .data = &ipv6_devconf.suppress_frag_ndisc,
6331 .maxlen = sizeof(int),
6332 .mode = 0644,
6333 .proc_handler = proc_dointvec
6334 },
6335 {
6336 .procname = "accept_ra_from_local",
6337 .data = &ipv6_devconf.accept_ra_from_local,
6338 .maxlen = sizeof(int),
6339 .mode = 0644,
6340 .proc_handler = proc_dointvec,
6341 },
6342 {
6343 .procname = "accept_ra_mtu",
6344 .data = &ipv6_devconf.accept_ra_mtu,
6345 .maxlen = sizeof(int),
6346 .mode = 0644,
6347 .proc_handler = proc_dointvec,
6348 },
6349 {
6350 .procname = "stable_secret",
6351 .data = &ipv6_devconf.stable_secret,
6352 .maxlen = IPV6_MAX_STRLEN,
6353 .mode = 0600,
6354 .proc_handler = addrconf_sysctl_stable_secret,
6355 },
6356 {
6357 .procname = "use_oif_addrs_only",
6358 .data = &ipv6_devconf.use_oif_addrs_only,
6359 .maxlen = sizeof(int),
6360 .mode = 0644,
6361 .proc_handler = proc_dointvec,
6362 },
6363 {
6364 .procname = "ignore_routes_with_linkdown",
6365 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6366 .maxlen = sizeof(int),
6367 .mode = 0644,
6368 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6369 },
6370 {
6371 .procname = "drop_unicast_in_l2_multicast",
6372 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6373 .maxlen = sizeof(int),
6374 .mode = 0644,
6375 .proc_handler = proc_dointvec,
6376 },
6377 {
6378 .procname = "drop_unsolicited_na",
6379 .data = &ipv6_devconf.drop_unsolicited_na,
6380 .maxlen = sizeof(int),
6381 .mode = 0644,
6382 .proc_handler = proc_dointvec,
6383 },
6384 {
6385 .procname = "keep_addr_on_down",
6386 .data = &ipv6_devconf.keep_addr_on_down,
6387 .maxlen = sizeof(int),
6388 .mode = 0644,
6389 .proc_handler = proc_dointvec,
6390
6391 },
1ababeba
DL		 6392 {
6393 .procname = "seg6_enabled",
6394 .data = &ipv6_devconf.seg6_enabled,
6395 .maxlen = sizeof(int),
6396 .mode = 0644,
6397 .proc_handler = proc_dointvec,
6398 },
bf355b8d
DL		 6399#ifdef CONFIG_IPV6_SEG6_HMAC
6400 {
6401 .procname = "seg6_require_hmac",
6402 .data = &ipv6_devconf.seg6_require_hmac,
6403 .maxlen = sizeof(int),
6404 .mode = 0644,
6405 .proc_handler = proc_dointvec,
6406 },
6407#endif
adc176c5
EN		 6408 {
6409 .procname = "enhanced_dad",
6410 .data = &ipv6_devconf.enhanced_dad,
6411 .maxlen = sizeof(int),
6412 .mode = 0644,
6413 .proc_handler = proc_dointvec,
6414 },
d35a00b8
FJ		 6415 {
6416 .procname = "addr_gen_mode",
6417 .data = &ipv6_devconf.addr_gen_mode,
6418 .maxlen = sizeof(int),
6419 .mode = 0644,
6420 .proc_handler = addrconf_sysctl_addr_gen_mode,
6421 },
df789fe7
DF		 6422 {
6423 .procname = "disable_policy",
6424 .data = &ipv6_devconf.disable_policy,
6425 .maxlen = sizeof(int),
6426 .mode = 0644,
6427 .proc_handler = addrconf_sysctl_disable_policy,
6428 },
2210d6b2
MŻ		 6429 {
6430 .procname = "ndisc_tclass",
6431 .data = &ipv6_devconf.ndisc_tclass,
6432 .maxlen = sizeof(int),
6433 .mode = 0644,
6434 .proc_handler = proc_dointvec_minmax,
6435 .extra1 = (void *)&zero,
6436 .extra2 = (void *)&two_five_five,
6437 },
5df1f77f
KK		 6438 {
6439 /* sentinel */
6440 }
1da177e4
LT		 6441};
6442
bff16c2f 6443static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 6444 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4 6445{
29c994e3 6446 int i, ifindex;
607ea7cd 6447 struct ctl_table *table;
6105e293 6448 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 6449
607ea7cd
KK		 6450 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6451 if (!table)
f68635e6
PE		 6452 goto out;
6453
607ea7cd
KK		 6454 for (i = 0; table[i].data; i++) {
6455 table[i].data += (char *)p - (char *)&ipv6_devconf;
cb9e684e
MŻ		 6456 /* If one of these is already set, then it is not safe to
6457 * overwrite either of them: this makes proc_dointvec_minmax
6458 * usable.
6459 */
6460 if (!table[i].extra1 && !table[i].extra2) {
6461 table[i].extra1 = idev; /* embedded; no ref */
6462 table[i].extra2 = net;
6463 }
1da177e4 6464 }
1da177e4 6465
6105e293 6466 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 6467
607ea7cd
KK		 6468 p->sysctl_header = register_net_sysctl(net, path, table);
6469 if (!p->sysctl_header)
6105e293 6470 goto free;
f68635e6 6471
29c994e3
ND		 6472 if (!strcmp(dev_name, "all"))
6473 ifindex = NETCONFA_IFINDEX_ALL;
6474 else if (!strcmp(dev_name, "default"))
6475 ifindex = NETCONFA_IFINDEX_DEFAULT;
6476 else
6477 ifindex = idev->dev->ifindex;
85b3daad
DA		 6478 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6479 ifindex, p);
95897312 6480 return 0;
1da177e4 6481
f68635e6 6482free:
607ea7cd 6483 kfree(table);
f68635e6 6484out:
95897312 6485 return -ENOBUFS;
1da177e4
LT		 6486}
6487
23452170
DA		 6488static void __addrconf_sysctl_unregister(struct net *net,
6489 struct ipv6_devconf *p, int ifindex)
408c4768 6490{
607ea7cd 6491 struct ctl_table *table;
408c4768 6492
607ea7cd 6493 if (!p->sysctl_header)
408c4768
PE		 6494 return;
6495
607ea7cd
KK		 6496 table = p->sysctl_header->ctl_table_arg;
6497 unregister_net_sysctl_table(p->sysctl_header);
6498 p->sysctl_header = NULL;
6499 kfree(table);
23452170
DA		 6500
6501 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
408c4768
PE		 6502}
6503
a317a2f1 6504static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 6505{
a317a2f1
WC		 6506 int err;
6507
6508 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6509 return -EINVAL;
6510
6511 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6512 &ndisc_ifinfo_sysctl_change);
6513 if (err)
6514 return err;
6515 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6516 idev, &idev->cnf);
6517 if (err)
6518 neigh_sysctl_unregister(idev->nd_parms);
6519
6520 return err;
f52295a9
PE		 6521}
6522
408c4768 6523static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 6524{
23452170
DA		 6525 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6526 idev->dev->ifindex);
408c4768 6527 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 6528}
6529
6530
6531#endif
6532
2c8c1e72 6533static int __net_init addrconf_init_net(struct net *net)
e0da5a48 6534{
a79ca223 6535 int err = -ENOMEM;
e0da5a48
PE		 6536 struct ipv6_devconf *all, *dflt;
6537
a79ca223 6538 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 6539 if (!all)
a79ca223 6540 goto err_alloc_all;
e0da5a48 6541
a79ca223 6542 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 6543 if (!dflt)
a79ca223 6544 goto err_alloc_dflt;
e0da5a48 6545
a79ca223
HZ		 6546 /* these will be inherited by all namespaces */
6547 dflt->autoconf = ipv6_defaults.autoconf;
6548 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 6549
3d1bec99
HFS		 6550 dflt->stable_secret.initialized = false;
6551 all->stable_secret.initialized = false;
6552
e0da5a48
PE		 6553 net->ipv6.devconf_all = all;
6554 net->ipv6.devconf_dflt = dflt;
6555
6556#ifdef CONFIG_SYSCTL
f8572d8f 6557 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 6558 if (err < 0)
6559 goto err_reg_all;
6560
f8572d8f 6561 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 6562 if (err < 0)
6563 goto err_reg_dflt;
6564#endif
6565 return 0;
6566
6567#ifdef CONFIG_SYSCTL
6568err_reg_dflt:
23452170 6569 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
e0da5a48
PE		 6570err_reg_all:
6571 kfree(dflt);
6572#endif
6573err_alloc_dflt:
6574 kfree(all);
6575err_alloc_all:
6576 return err;
6577}
6578
2c8c1e72 6579static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 6580{
6581#ifdef CONFIG_SYSCTL
23452170
DA		 6582 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6583 NETCONFA_IFINDEX_DEFAULT);
6584 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6585 NETCONFA_IFINDEX_ALL);
e0da5a48 6586#endif
73cf0e92 6587 kfree(net->ipv6.devconf_dflt);
6588 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 6589}
6590
6591static struct pernet_operations addrconf_ops = {
6592 .init = addrconf_init_net,
6593 .exit = addrconf_exit_net,
6594};
6595
207895fd 6596static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 6597 .family = AF_INET6,
6598 .fill_link_af = inet6_fill_link_af,
6599 .get_link_af_size = inet6_get_link_af_size,
11b1f828 6600 .validate_link_af = inet6_validate_link_af,
f53adae4 6601 .set_link_af = inet6_set_link_af,
b382b191
TG		 6602};
6603
1da177e4
LT		 6604/*
6605 * Init / cleanup code
6606 */
6607
6608int __init addrconf_init(void)
6609{
a317a2f1 6610 struct inet6_dev *idev;
c2e21293 6611 int i, err;
2a8cc6c8 6612
e21e8467
SH		 6613 err = ipv6_addr_label_init();
6614 if (err < 0) {
f3213831
JP		 6615 pr_crit("%s: cannot initialize default policy table: %d\n",
6616 __func__, err);
2cc6d2bf 6617 goto out;
2a8cc6c8 6618 }
1da177e4 6619
2cc6d2bf
NH		 6620 err = register_pernet_subsys(&addrconf_ops);
6621 if (err < 0)
6622 goto out_addrlabel;
e0da5a48 6623
c15b1cca
HFS		 6624 addrconf_wq = create_workqueue("ipv6_addrconf");
6625 if (!addrconf_wq) {
6626 err = -ENOMEM;
6627 goto out_nowq;
6628 }
6629
1da177e4
LT		 6630 /* The addrconf netdev notifier requires that loopback_dev
6631 * has it's ipv6 private information allocated and setup
6632 * before it can bring up and give link-local addresses
6633 * to other devices which are up.
6634 *
6635 * Unfortunately, loopback_dev is not necessarily the first
6636 * entry in the global dev_base list of net devices. In fact,
6637 * it is likely to be the very last entry on that list.
6638 * So this causes the notifier registry below to try and
6639 * give link-local addresses to all devices besides loopback_dev
6640 * first, then loopback_dev, which cases all the non-loopback_dev
6641 * devices to fail to get a link-local address.
6642 *
6643 * So, as a temporary fix, allocate the ipv6 structure for
6644 * loopback_dev first by hand.
6645 * Longer term, all of the dependencies ipv6 has upon the loopback
6646 * device and it being up should be removed.
6647 */
6648 rtnl_lock();
a317a2f1 6649 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 6650 rtnl_unlock();
a317a2f1
WC		 6651 if (IS_ERR(idev)) {
6652 err = PTR_ERR(idev);
e0da5a48 6653 goto errlo;
a317a2f1 6654 }
1da177e4 6655
2f460933
WC		 6656 ip6_route_init_special_entries();
6657
c2e21293 6658 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6659 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6660
1da177e4
LT		 6661 register_netdevice_notifier(&ipv6_dev_notf);
6662
c15b1cca 6663 addrconf_verify();
c127ea2c 6664
3678a9d8 6665 rtnl_af_register(&inet6_ops);
b382b191 6666
16feebcf
FW		 6667 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
6668 NULL, inet6_dump_ifinfo, 0);
c127ea2c
TG		 6669 if (err < 0)
6670 goto errout;
6671
16feebcf
FW		 6672 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
6673 inet6_rtm_newaddr, NULL, 0);
6674 if (err < 0)
6675 goto errout;
6676 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
6677 inet6_rtm_deladdr, NULL, 0);
6678 if (err < 0)
6679 goto errout;
6680 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
6681 inet6_rtm_getaddr, inet6_dump_ifaddr,
6682 RTNL_FLAG_DOIT_UNLOCKED);
6683 if (err < 0)
6684 goto errout;
6685 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
6686 NULL, inet6_dump_ifmcaddr, 0);
6687 if (err < 0)
6688 goto errout;
6689 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
6690 NULL, inet6_dump_ifacaddr, 0);
6691 if (err < 0)
6692 goto errout;
6693 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
6694 inet6_netconf_get_devconf,
6695 inet6_netconf_dump_devconf,
6696 RTNL_FLAG_DOIT_UNLOCKED);
6697 if (err < 0)
6698 goto errout;
a3fde2ad
FW		 6699 err = ipv6_addr_label_rtnl_register();
6700 if (err < 0)
6701 goto errout;
2a8cc6c8 6702
1da177e4 6703 return 0;
c127ea2c 6704errout:
16feebcf 6705 rtnl_unregister_all(PF_INET6);
b382b191 6706 rtnl_af_unregister(&inet6_ops);
c127ea2c 6707 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6708errlo:
c15b1cca
HFS		 6709 destroy_workqueue(addrconf_wq);
6710out_nowq:
e0da5a48 6711 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 6712out_addrlabel:
6713 ipv6_addr_label_cleanup();
6714out:
c127ea2c 6715 return err;
1da177e4
LT		 6716}
6717
09f7709f 6718void addrconf_cleanup(void)
1da177e4 6719{
176c39af 6720 struct net_device *dev;
1da177e4
LT		 6721 int i;
6722
6723 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6724 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 6725 ipv6_addr_label_cleanup();
1da177e4 6726
5c45121d 6727 rtnl_af_unregister(&inet6_ops);
1da177e4 6728
5c45121d 6729 rtnl_lock();
b382b191 6730
176c39af
DL		 6731 /* clean dev list */
6732 for_each_netdev(&init_net, dev) {
6733 if (__in6_dev_get(dev) == NULL)
6734 continue;
6735 addrconf_ifdown(dev, 1);
6736 }
6737 addrconf_ifdown(init_net.loopback_dev, 2);
6738
1da177e4
LT		 6739 /*
6740 * Check hash table.
6741 */
5c578aed 6742 spin_lock_bh(&addrconf_hash_lock);
c2e21293 6743 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6744 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 6745 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 6746 cancel_delayed_work(&addr_chk_work);
1da177e4 6747 rtnl_unlock();
c15b1cca
HFS		 6748
6749 destroy_workqueue(addrconf_wq);
1da177e4 6750}
Linux 6.x block layer and io_uring tree(s)