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net/sched: flower: Fix null pointer dereference when run tc vlan command
[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
8d1c802b 173static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
21caa662
RK		 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 }
1da177e4 919
e5785985 920 kfree_rcu(ifp, rcu);
1da177e4
LT		 921}
922
e55ffac6
BH		 923static void
924ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
925{
502a2ffd 926 struct list_head *p;
8a6ce0c0 927 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 928
929 /*
930 * Each device address list is sorted in order of scope -
931 * global before linklocal.
932 */
502a2ffd 933 list_for_each(p, &idev->addr_list) {
934 struct inet6_ifaddr *ifa
935 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 936 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 937 break;
938 }
939
8ef802aa 940 list_add_tail_rcu(&ifp->if_list, p);
e55ffac6
BH		 941}
942
3f27fb23 943static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
3eb84f49 944{
3f27fb23
ED		 945 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
946
947 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 948}
949
56fc709b 950static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
752a9292 951 struct net_device *dev, unsigned int hash)
56fc709b 952{
56fc709b
ED		 953 struct inet6_ifaddr *ifp;
954
955 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
956 if (!net_eq(dev_net(ifp->idev->dev), net))
957 continue;
958 if (ipv6_addr_equal(&ifp->addr, addr)) {
959 if (!dev || ifp->idev->dev == dev)
960 return true;
961 }
962 }
963 return false;
964}
965
f3d9832e
DA		 966static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
967{
3f27fb23 968 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
f3d9832e
DA		 969 int err = 0;
970
971 spin_lock(&addrconf_hash_lock);
972
973 /* Ignore adding duplicate addresses on an interface */
752a9292 974 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
e32ac250 975 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
f3d9832e 976 err = -EEXIST;
752a9292
ED		 977 } else {
978 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
f3d9832e
DA		 979 }
980
f3d9832e
DA		 981 spin_unlock(&addrconf_hash_lock);
982
983 return err;
984}
985
1da177e4
LT		 986/* On success it returns ifp with increased reference count */
987
988static struct inet6_ifaddr *
e6464b8c 989ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
de95e047 990 bool can_block, struct netlink_ext_ack *extack)
1da177e4 991{
f3d9832e 992 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
e6464b8c 993 int addr_type = ipv6_addr_type(cfg->pfx);
df789fe7 994 struct net *net = dev_net(idev->dev);
1da177e4 995 struct inet6_ifaddr *ifa = NULL;
360a9887 996 struct fib6_info *f6i = NULL;
1da177e4 997 int err = 0;
d68b8270
YH		 998
999 if (addr_type == IPV6_ADDR_ANY ||
1000 addr_type & IPV6_ADDR_MULTICAST ||
1001 (!(idev->dev->flags & IFF_LOOPBACK) &&
1002 addr_type & IPV6_ADDR_LOOPBACK))
1003 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 1004
1da177e4
LT		 1005 if (idev->dead) {
1006 err = -ENODEV; /*XXX*/
f3d9832e 1007 goto out;
1da177e4
LT		 1008 }
1009
56d417b1 1010 if (idev->cnf.disable_ipv6) {
9bdd8d40 1011 err = -EACCES;
f3d9832e 1012 goto out;
9bdd8d40
BH		 1013 }
1014
ff7883ea
DA		 1015 /* validator notifier needs to be blocking;
1016 * do not call in atomic context
1017 */
1018 if (can_block) {
1019 struct in6_validator_info i6vi = {
e6464b8c 1020 .i6vi_addr = *cfg->pfx,
ff7883ea 1021 .i6vi_dev = idev,
de95e047 1022 .extack = extack,
ff7883ea
DA		 1023 };
1024
1025 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1026 err = notifier_to_errno(err);
1027 if (err < 0)
1028 goto out;
1029 }
1da177e4 1030
f3d9832e 1031 ifa = kzalloc(sizeof(*ifa), gfp_flags);
63159f29 1032 if (!ifa) {
1da177e4
LT		 1033 err = -ENOBUFS;
1034 goto out;
1035 }
1036
e6464b8c 1037 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
360a9887
DA		 1038 if (IS_ERR(f6i)) {
1039 err = PTR_ERR(f6i);
1040 f6i = NULL;
1da177e4
LT		 1041 goto out;
1042 }
1043
df789fe7
DF		 1044 if (net->ipv6.devconf_all->disable_policy ||
1045 idev->cnf.disable_policy)
360a9887 1046 f6i->dst_nopolicy = true;
df789fe7 1047
bba24896
JP		 1048 neigh_parms_data_state_setall(idev->nd_parms);
1049
e6464b8c
DA		 1050 ifa->addr = *cfg->pfx;
1051 if (cfg->peer_pfx)
1052 ifa->peer_addr = *cfg->peer_pfx;
1da177e4
LT		 1053
1054 spin_lock_init(&ifa->lock);
c15b1cca 1055 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 1056 INIT_HLIST_NODE(&ifa->addr_lst);
e6464b8c
DA		 1057 ifa->scope = cfg->scope;
1058 ifa->prefix_len = cfg->plen;
8308f3ff 1059 ifa->rt_priority = cfg->rt_priority;
e6464b8c 1060 ifa->flags = cfg->ifa_flags;
66eb9f86 1061 /* No need to add the TENTATIVE flag for addresses with NODAD */
e6464b8c 1062 if (!(cfg->ifa_flags & IFA_F_NODAD))
66eb9f86 1063 ifa->flags |= IFA_F_TENTATIVE;
e6464b8c
DA		 1064 ifa->valid_lft = cfg->valid_lft;
1065 ifa->prefered_lft = cfg->preferred_lft;
1da177e4 1066 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 1067 ifa->tokenized = false;
1da177e4 1068
360a9887 1069 ifa->rt = f6i;
57f5f544 1070
1da177e4 1071 ifa->idev = idev;
f3d9832e
DA		 1072 in6_dev_hold(idev);
1073
1da177e4 1074 /* For caller */
271201c0 1075 refcount_set(&ifa->refcnt, 1);
1da177e4 1076
f3d9832e 1077 rcu_read_lock_bh();
1da177e4 1078
f3d9832e
DA		 1079 err = ipv6_add_addr_hash(idev->dev, ifa);
1080 if (err < 0) {
1081 rcu_read_unlock_bh();
1082 goto out;
1083 }
1da177e4
LT		 1084
1085 write_lock(&idev->lock);
f3d9832e 1086
1da177e4 1087 /* Add to inet6_dev unicast addr list. */
e55ffac6 1088 ipv6_link_dev_addr(idev, ifa);
1da177e4 1089
1da177e4 1090 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 1091 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 1092 in6_ifa_hold(ifa);
1093 }
1da177e4 1094
1da177e4
LT		 1095 in6_ifa_hold(ifa);
1096 write_unlock(&idev->lock);
f3d9832e 1097
8814c4b5 1098 rcu_read_unlock_bh();
1da177e4 1099
f3d9832e
DA		 1100 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1101out:
1102 if (unlikely(err < 0)) {
360a9887 1103 fib6_info_release(f6i);
93531c67 1104
f3d9832e
DA		 1105 if (ifa) {
1106 if (ifa->idev)
1107 in6_dev_put(ifa->idev);
1108 kfree(ifa);
1109 }
1da177e4
LT		 1110 ifa = ERR_PTR(err);
1111 }
1112
1113 return ifa;
1da177e4
LT		 1114}
1115
5b84efec
TH		 1116enum cleanup_prefix_rt_t {
1117 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1118 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1119 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1120};
1121
1122/*
1123 * Check, whether the prefix for ifp would still need a prefix route
1124 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1125 * constants.
1126 *
1127 * 1) we don't purge prefix if address was not permanent.
1128 * prefix is managed by its own lifetime.
1129 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1130 * 3) if there are no addresses, delete prefix.
1131 * 4) if there are still other permanent address(es),
1132 * corresponding prefix is still permanent.
1133 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1134 * don't purge the prefix, assume user space is managing it.
1135 * 6) otherwise, update prefix lifetime to the
1136 * longest valid lifetime among the corresponding
1137 * addresses on the device.
1138 * Note: subsequent RA will update lifetime.
1139 **/
1140static enum cleanup_prefix_rt_t
1141check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1142{
1143 struct inet6_ifaddr *ifa;
1144 struct inet6_dev *idev = ifp->idev;
1145 unsigned long lifetime;
1146 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1147
1148 *expires = jiffies;
1149
1150 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1151 if (ifa == ifp)
1152 continue;
1153 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1154 ifp->prefix_len))
1155 continue;
1156 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1157 return CLEANUP_PREFIX_RT_NOP;
1158
1159 action = CLEANUP_PREFIX_RT_EXPIRE;
1160
1161 spin_lock(&ifa->lock);
1162
1163 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1164 /*
1165 * Note: Because this address is
1166 * not permanent, lifetime <
1167 * LONG_MAX / HZ here.
1168 */
1169 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1170 *expires = ifa->tstamp + lifetime * HZ;
1171 spin_unlock(&ifa->lock);
1172 }
1173
1174 return action;
1175}
1176
1177static void
1178cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1179{
93c2fb25 1180 struct fib6_info *f6i;
5b84efec 1181
93c2fb25 1182 f6i = addrconf_get_prefix_route(&ifp->addr,
5b84efec
TH		 1183 ifp->prefix_len,
1184 ifp->idev->dev,
1185 0, RTF_GATEWAY | RTF_DEFAULT);
93c2fb25 1186 if (f6i) {
5b84efec 1187 if (del_rt)
93c2fb25 1188 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
5b84efec 1189 else {
93c2fb25
DA		 1190 if (!(f6i->fib6_flags & RTF_EXPIRES))
1191 fib6_set_expires(f6i, expires);
1192 fib6_info_release(f6i);
5b84efec
TH		 1193 }
1194 }
1195}
1196
1197
1da177e4
LT		 1198/* This function wants to get referenced ifp and releases it before return */
1199
1200static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1201{
4c5ff6a6 1202 int state;
5b84efec
TH		 1203 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1204 unsigned long expires;
1da177e4 1205
c15b1cca
HFS		 1206 ASSERT_RTNL();
1207
8e8e676d 1208 spin_lock_bh(&ifp->lock);
4c5ff6a6 1209 state = ifp->state;
e9d3e084 1210 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1211 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1212
1213 if (state == INET6_IFADDR_STATE_DEAD)
1214 goto out;
1da177e4 1215
5c578aed 1216 spin_lock_bh(&addrconf_hash_lock);
1217 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1218 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1219
5b84efec 1220 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1221
1da177e4 1222 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1223 list_del(&ifp->tmp_list);
1224 if (ifp->ifpub) {
1225 in6_ifa_put(ifp->ifpub);
1226 ifp->ifpub = NULL;
1da177e4 1227 }
372e6c8f 1228 __in6_ifa_put(ifp);
1da177e4 1229 }
1da177e4 1230
5b84efec
TH		 1231 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1232 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1233
8ef802aa 1234 list_del_rcu(&ifp->if_list);
5b84efec
TH		 1235 __in6_ifa_put(ifp);
1236
1237 write_unlock_bh(&ifp->idev->lock);
1da177e4 1238
c15b1cca 1239 addrconf_del_dad_work(ifp);
b2238566 1240
1da177e4
LT		 1241 ipv6_ifa_notify(RTM_DELADDR, ifp);
1242
f88c91dd 1243 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1244
5b84efec
TH		 1245 if (action != CLEANUP_PREFIX_RT_NOP) {
1246 cleanup_prefix_route(ifp, expires,
1247 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1248 }
1249
c3968a85
DW		 1250 /* clean up prefsrc entries */
1251 rt6_remove_prefsrc(ifp);
4c5ff6a6 1252out:
1da177e4
LT		 1253 in6_ifa_put(ifp);
1254}
1255
fffcefe9
ED		 1256static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp,
1257 struct inet6_ifaddr *ift,
1258 bool block)
1da177e4
LT		 1259{
1260 struct inet6_dev *idev = ifp->idev;
1261 struct in6_addr addr, *tmpaddr;
e6464b8c 1262 unsigned long tmp_tstamp, age;
eac55bf9 1263 unsigned long regen_advance;
e6464b8c 1264 struct ifa6_config cfg;
1da177e4 1265 int ret = 0;
76f793e3 1266 unsigned long now = jiffies;
76506a98 1267 long max_desync_factor;
7aa8e63f 1268 s32 cnf_temp_preferred_lft;
1da177e4 1269
53bd6749 1270 write_lock_bh(&idev->lock);
1da177e4
LT		 1271 if (ift) {
1272 spin_lock_bh(&ift->lock);
1273 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1274 spin_unlock_bh(&ift->lock);
1275 tmpaddr = &addr;
1276 } else {
1277 tmpaddr = NULL;
1278 }
1279retry:
1280 in6_dev_hold(idev);
1281 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1282 write_unlock_bh(&idev->lock);
f3213831 1283 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1284 in6_dev_put(idev);
1285 ret = -1;
1286 goto out;
1287 }
1288 spin_lock_bh(&ifp->lock);
1289 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1290 idev->cnf.use_tempaddr = -1; /*XXX*/
1291 spin_unlock_bh(&ifp->lock);
53bd6749 1292 write_unlock_bh(&idev->lock);
f3213831
JP		 1293 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1294 __func__);
1da177e4
LT		 1295 in6_dev_put(idev);
1296 ret = -1;
1297 goto out;
1298 }
1299 in6_ifa_hold(ifp);
1300 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
9d6280da 1301 ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1302 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1303 age = (now - ifp->tstamp) / HZ;
76506a98
JB		 1304
1305 regen_advance = idev->cnf.regen_max_retry *
1306 idev->cnf.dad_transmits *
1307 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1308
1309 /* recalculate max_desync_factor each time and update
1310 * idev->desync_factor if it's larger
1311 */
7aa8e63f 1312 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
76506a98
JB		 1313 max_desync_factor = min_t(__u32,
1314 idev->cnf.max_desync_factor,
7aa8e63f 1315 cnf_temp_preferred_lft - regen_advance);
76506a98
JB		 1316
1317 if (unlikely(idev->desync_factor > max_desync_factor)) {
1318 if (max_desync_factor > 0) {
1319 get_random_bytes(&idev->desync_factor,
1320 sizeof(idev->desync_factor));
1321 idev->desync_factor %= max_desync_factor;
1322 } else {
1323 idev->desync_factor = 0;
1324 }
1325 }
1326
3f2d67b6 1327 memset(&cfg, 0, sizeof(cfg));
e6464b8c 1328 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
7a876b0e 1329 idev->cnf.temp_valid_lft + age);
e6464b8c
DA		 1330 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1331 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1332
1333 cfg.plen = ifp->prefix_len;
1da177e4
LT		 1334 tmp_tstamp = ifp->tstamp;
1335 spin_unlock_bh(&ifp->lock);
1336
53bd6749 1337 write_unlock_bh(&idev->lock);
95c385b4 1338
eac55bf9
BB		 1339 /* A temporary address is created only if this calculated Preferred
1340 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1341 * an implementation must not create a temporary address with a zero
1342 * Preferred Lifetime.
ecab6701
HK		 1343 * Use age calculation as in addrconf_verify to avoid unnecessary
1344 * temporary addresses being generated.
eac55bf9 1345 */
ecab6701 1346 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
e6464b8c 1347 if (cfg.preferred_lft <= regen_advance + age) {
eac55bf9
BB		 1348 in6_ifa_put(ifp);
1349 in6_dev_put(idev);
1350 ret = -1;
1351 goto out;
1352 }
1353
e6464b8c 1354 cfg.ifa_flags = IFA_F_TEMPORARY;
95c385b4
NH		 1355 /* set in addrconf_prefix_rcv() */
1356 if (ifp->flags & IFA_F_OPTIMISTIC)
e6464b8c 1357 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
95c385b4 1358
e6464b8c
DA		 1359 cfg.pfx = &addr;
1360 cfg.scope = ipv6_addr_scope(cfg.pfx);
95c385b4 1361
e6464b8c 1362 ift = ipv6_add_addr(idev, &cfg, block, NULL);
4b08a8f1 1363 if (IS_ERR(ift)) {
1da177e4
LT		 1364 in6_ifa_put(ifp);
1365 in6_dev_put(idev);
f3213831 1366 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1367 tmpaddr = &addr;
53bd6749 1368 write_lock_bh(&idev->lock);
1da177e4
LT		 1369 goto retry;
1370 }
1371
1372 spin_lock_bh(&ift->lock);
1373 ift->ifpub = ifp;
76f793e3 1374 ift->cstamp = now;
1da177e4
LT		 1375 ift->tstamp = tmp_tstamp;
1376 spin_unlock_bh(&ift->lock);
1377
cf22f9a2 1378 addrconf_dad_start(ift);
1da177e4
LT		 1379 in6_ifa_put(ift);
1380 in6_dev_put(idev);
1381out:
1382 return ret;
1383}
1da177e4
LT		 1384
1385/*
072047e4 1386 * Choose an appropriate source address (RFC3484)
1da177e4 1387 */
a9b05723
YH		 1388enum {
1389 IPV6_SADDR_RULE_INIT = 0,
1390 IPV6_SADDR_RULE_LOCAL,
1391 IPV6_SADDR_RULE_SCOPE,
1392 IPV6_SADDR_RULE_PREFERRED,
1393#ifdef CONFIG_IPV6_MIP6
1394 IPV6_SADDR_RULE_HOA,
1395#endif
1396 IPV6_SADDR_RULE_OIF,
1397 IPV6_SADDR_RULE_LABEL,
a9b05723 1398 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1399 IPV6_SADDR_RULE_ORCHID,
1400 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1401#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1402 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1403#endif
a9b05723
YH		 1404 IPV6_SADDR_RULE_MAX
1405};
1406
072047e4 1407struct ipv6_saddr_score {
a9b05723
YH		 1408 int rule;
1409 int addr_type;
1410 struct inet6_ifaddr *ifa;
1411 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1412 int scopedist;
1413 int matchlen;
072047e4
YH		 1414};
1415
a9b05723 1416struct ipv6_saddr_dst {
9acd9f3a 1417 const struct in6_addr *addr;
a9b05723
YH		 1418 int ifindex;
1419 int scope;
1420 int label;
7cbca67c 1421 unsigned int prefs;
a9b05723 1422};
072047e4 1423
b6f99a21 1424static inline int ipv6_saddr_preferred(int type)
1da177e4 1425{
45bb0060 1426 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1427 return 1;
1428 return 0;
1da177e4
LT		 1429}
1430
35e015e1
MC		 1431static bool ipv6_use_optimistic_addr(struct net *net,
1432 struct inet6_dev *idev)
7fd2561e
EK		 1433{
1434#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 1435 if (!idev)
1436 return false;
1437 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1438 return false;
1439 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1440 return false;
1441
1442 return true;
7fd2561e
EK		 1443#else
1444 return false;
1445#endif
1446}
1447
f1c02cfb
SD		 1448static bool ipv6_allow_optimistic_dad(struct net *net,
1449 struct inet6_dev *idev)
1450{
1451#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1452 if (!idev)
1453 return false;
1454 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1455 return false;
1456
1457 return true;
1458#else
1459 return false;
1460#endif
1461}
1462
3de23255
BT		 1463static int ipv6_get_saddr_eval(struct net *net,
1464 struct ipv6_saddr_score *score,
a9b05723
YH		 1465 struct ipv6_saddr_dst *dst,
1466 int i)
1467{
1468 int ret;
1469
1470 if (i <= score->rule) {
1471 switch (i) {
1472 case IPV6_SADDR_RULE_SCOPE:
1473 ret = score->scopedist;
1474 break;
1475 case IPV6_SADDR_RULE_PREFIX:
1476 ret = score->matchlen;
1477 break;
1478 default:
1479 ret = !!test_bit(i, score->scorebits);
1480 }
1481 goto out;
1482 }
1483
1484 switch (i) {
1485 case IPV6_SADDR_RULE_INIT:
1486 /* Rule 0: remember if hiscore is not ready yet */
1487 ret = !!score->ifa;
1488 break;
1489 case IPV6_SADDR_RULE_LOCAL:
1490 /* Rule 1: Prefer same address */
1491 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1492 break;
1493 case IPV6_SADDR_RULE_SCOPE:
1494 /* Rule 2: Prefer appropriate scope
1495 *
1496 * ret
1497 * ^
1498 * -1 | d 15
1499 * ---+--+-+---> scope
1500 * |
1501 * | d is scope of the destination.
1502 * B-d | \
1503 * | \ <- smaller scope is better if
db9c7c39 1504 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1505 * | ret = B - scope (-1 <= scope >= d <= 15).
1506 * d-C-1 | /
1507 * |/ <- greater is better
1508 * -C / if scope is not enough for destination.
1509 * /| ret = scope - C (-1 <= d < scope <= 15).
1510 *
1511 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1512 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1513 * Assume B = 0 and we get C > 29.
1514 */
1515 ret = __ipv6_addr_src_scope(score->addr_type);
1516 if (ret >= dst->scope)
1517 ret = -ret;
1518 else
1519 ret -= 128; /* 30 is enough */
1520 score->scopedist = ret;
1521 break;
1522 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1523 {
a9b05723 1524 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1525 u8 avoid = IFA_F_DEPRECATED;
1526
35e015e1 1527 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
7fd2561e 1528 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1529 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1530 !(score->ifa->flags & avoid);
a9b05723 1531 break;
7fd2561e 1532 }
a9b05723
YH		 1533#ifdef CONFIG_IPV6_MIP6
1534 case IPV6_SADDR_RULE_HOA:
7cbca67c 1535 {
a9b05723 1536 /* Rule 4: Prefer home address */
7cbca67c
YH		 1537 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1538 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1539 break;
7cbca67c 1540 }
a9b05723
YH		 1541#endif
1542 case IPV6_SADDR_RULE_OIF:
1543 /* Rule 5: Prefer outgoing interface */
1544 ret = (!dst->ifindex ||
1545 dst->ifindex == score->ifa->idev->dev->ifindex);
1546 break;
1547 case IPV6_SADDR_RULE_LABEL:
1548 /* Rule 6: Prefer matching label */
3de23255
BT		 1549 ret = ipv6_addr_label(net,
1550 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1551 score->ifa->idev->dev->ifindex) == dst->label;
1552 break;
a9b05723 1553 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1554 {
a9b05723 1555 /* Rule 7: Prefer public address
25985edc 1556 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1557 */
7cbca67c
YH		 1558 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1559 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1560 score->ifa->idev->cnf.use_tempaddr >= 2;
1561 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1562 break;
7cbca67c 1563 }
a9b05723
YH		 1564 case IPV6_SADDR_RULE_ORCHID:
1565 /* Rule 8-: Prefer ORCHID vs ORCHID or
1566 * non-ORCHID vs non-ORCHID
1567 */
1568 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1569 ipv6_addr_orchid(dst->addr));
1570 break;
1571 case IPV6_SADDR_RULE_PREFIX:
1572 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1573 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1574 if (ret > score->ifa->prefix_len)
1575 ret = score->ifa->prefix_len;
1576 score->matchlen = ret;
a9b05723 1577 break;
7fd2561e
EK		 1578#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1579 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1580 /* Optimistic addresses still have lower precedence than other
1581 * preferred addresses.
1582 */
1583 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1584 break;
1585#endif
a9b05723
YH		 1586 default:
1587 ret = 0;
1588 }
1589
1590 if (ret)
1591 __set_bit(i, score->scorebits);
1592 score->rule = i;
1593out:
1594 return ret;
1595}
1596
c0b8da1e
YH		 1597static int __ipv6_dev_get_saddr(struct net *net,
1598 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1599 struct inet6_dev *idev,
1600 struct ipv6_saddr_score *scores,
1601 int hiscore_idx)
9131f3de 1602{
c0b8da1e 1603 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de 1604
f59c031e 1605 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
9131f3de
YH		 1606 int i;
1607
1608 /*
1609 * - Tentative Address (RFC2462 section 5.4)
1610 * - A tentative address is not considered
1611 * "assigned to an interface" in the traditional
1612 * sense, unless it is also flagged as optimistic.
1613 * - Candidate Source Address (section 4)
1614 * - In any case, anycast addresses, multicast
1615 * addresses, and the unspecified address MUST
1616 * NOT be included in a candidate set.
1617 */
1618 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1619 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1620 continue;
1621
1622 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1623
1624 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1625 score->addr_type & IPV6_ADDR_MULTICAST)) {
1626 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1627 idev->dev->name);
1628 continue;
1629 }
1630
1631 score->rule = -1;
1632 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1633
1634 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1635 int minihiscore, miniscore;
1636
1637 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1638 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1639
1640 if (minihiscore > miniscore) {
1641 if (i == IPV6_SADDR_RULE_SCOPE &&
1642 score->scopedist > 0) {
1643 /*
1644 * special case:
1645 * each remaining entry
1646 * has too small (not enough)
1647 * scope, because ifa entries
1648 * are sorted by their scope
1649 * values.
1650 */
1651 goto out;
1652 }
1653 break;
1654 } else if (minihiscore < miniscore) {
9131f3de 1655 swap(hiscore, score);
c0b8da1e 1656 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1657
1658 /* restore our iterator */
1659 score->ifa = hiscore->ifa;
1660
1661 break;
1662 }
1663 }
1664 }
1665out:
c0b8da1e 1666 return hiscore_idx;
9131f3de
YH		 1667}
1668
afbac601
DA		 1669static int ipv6_get_saddr_master(struct net *net,
1670 const struct net_device *dst_dev,
1671 const struct net_device *master,
1672 struct ipv6_saddr_dst *dst,
1673 struct ipv6_saddr_score *scores,
1674 int hiscore_idx)
1675{
1676 struct inet6_dev *idev;
1677
1678 idev = __in6_dev_get(dst_dev);
1679 if (idev)
1680 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1681 scores, hiscore_idx);
1682
1683 idev = __in6_dev_get(master);
1684 if (idev)
1685 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1686 scores, hiscore_idx);
1687
1688 return hiscore_idx;
1689}
1690
b3f644fc 1691int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1692 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1693 struct in6_addr *saddr)
1da177e4 1694{
c0b8da1e 1695 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1696 struct ipv6_saddr_dst dst;
9131f3de 1697 struct inet6_dev *idev;
072047e4 1698 struct net_device *dev;
a9b05723 1699 int dst_type;
9131f3de 1700 bool use_oif_addr = false;
c0b8da1e 1701 int hiscore_idx = 0;
cc429c8f 1702 int ret = 0;
1da177e4 1703
a9b05723
YH		 1704 dst_type = __ipv6_addr_type(daddr);
1705 dst.addr = daddr;
1706 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1707 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1708 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1709 dst.prefs = prefs;
a9b05723 1710
c0b8da1e
YH		 1711 scores[hiscore_idx].rule = -1;
1712 scores[hiscore_idx].ifa = NULL;
1da177e4 1713
8814c4b5 1714 rcu_read_lock();
1da177e4 1715
9131f3de
YH		 1716 /* Candidate Source Address (section 4)
1717 * - multicast and link-local destination address,
1718 * the set of candidate source address MUST only
1719 * include addresses assigned to interfaces
1720 * belonging to the same link as the outgoing
1721 * interface.
1722 * (- For site-local destination addresses, the
1723 * set of candidate source addresses MUST only
1724 * include addresses assigned to interfaces
1725 * belonging to the same site as the outgoing
1726 * interface.)
3985e8a3
EK		 1727 * - "It is RECOMMENDED that the candidate source addresses
1728 * be the set of unicast addresses assigned to the
1729 * interface that will be used to send to the destination
1730 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1731 */
1732 if (dst_dev) {
3985e8a3 1733 idev = __in6_dev_get(dst_dev);
9131f3de 1734 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1735 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1736 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1737 use_oif_addr = true;
1738 }
1739 }
a9b05723 1740
9131f3de 1741 if (use_oif_addr) {
c0b8da1e 1742 if (idev)
c15df306 1743 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de 1744 } else {
afbac601
DA		 1745 const struct net_device *master;
1746 int master_idx = 0;
1747
1748 /* if dst_dev exists and is enslaved to an L3 device, then
1749 * prefer addresses from dst_dev and then the master over
1750 * any other enslaved devices in the L3 domain.
1751 */
1752 master = l3mdev_master_dev_rcu(dst_dev);
1753 if (master) {
1754 master_idx = master->ifindex;
1755
1756 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1757 master, &dst,
1758 scores, hiscore_idx);
1759
1760 if (scores[hiscore_idx].ifa)
1761 goto out;
1762 }
1763
9131f3de 1764 for_each_netdev_rcu(net, dev) {
afbac601
DA		 1765 /* only consider addresses on devices in the
1766 * same L3 domain
1767 */
1768 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1769 continue;
9131f3de
YH		 1770 idev = __in6_dev_get(dev);
1771 if (!idev)
072047e4 1772 continue;
c15df306 1773 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1774 }
1775 }
afbac601
DA		 1776
1777out:
c0b8da1e 1778 hiscore = &scores[hiscore_idx];
a9b05723 1779 if (!hiscore->ifa)
cc429c8f
ED		 1780 ret = -EADDRNOTAVAIL;
1781 else
1782 *saddr = hiscore->ifa->addr;
1ab1457c 1783
cc429c8f
ED		 1784 rcu_read_unlock();
1785 return ret;
1da177e4 1786}
5e5f3f0f 1787EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1788
8965779d 1789int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1790 u32 banned_flags)
b7b1bfce
HFS		 1791{
1792 struct inet6_ifaddr *ifp;
1793 int err = -EADDRNOTAVAIL;
1794
602582ca
HFS		 1795 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1796 if (ifp->scope > IFA_LINK)
1797 break;
b7b1bfce
HFS		 1798 if (ifp->scope == IFA_LINK &&
1799 !(ifp->flags & banned_flags)) {
1800 *addr = ifp->addr;
1801 err = 0;
1802 break;
1803 }
1804 }
1805 return err;
1806}
1807
95c385b4 1808int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1809 u32 banned_flags)
1da177e4
LT		 1810{
1811 struct inet6_dev *idev;
1812 int err = -EADDRNOTAVAIL;
1813
8814c4b5 1814 rcu_read_lock();
e21e8467
SH		 1815 idev = __in6_dev_get(dev);
1816 if (idev) {
1da177e4 1817 read_lock_bh(&idev->lock);
b7b1bfce 1818 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1819 read_unlock_bh(&idev->lock);
1820 }
8814c4b5 1821 rcu_read_unlock();
1da177e4
LT		 1822 return err;
1823}
1824
d9bf82c2 1825static int ipv6_count_addresses(const struct inet6_dev *idev)
1da177e4 1826{
d9bf82c2 1827 const struct inet6_ifaddr *ifp;
1da177e4 1828 int cnt = 0;
1da177e4 1829
d9bf82c2
ED		 1830 rcu_read_lock();
1831 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1da177e4 1832 cnt++;
d9bf82c2 1833 rcu_read_unlock();
1da177e4
LT		 1834 return cnt;
1835}
1836
b71d1d42 1837int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1838 const struct net_device *dev, int strict)
c58da4c6 1839{
232378e8
DA		 1840 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1841 strict, IFA_F_TENTATIVE);
c58da4c6
EK		 1842}
1843EXPORT_SYMBOL(ipv6_chk_addr);
1844
1893ff20
DA		 1845/* device argument is used to find the L3 domain of interest. If
1846 * skip_dev_check is set, then the ifp device is not checked against
1847 * the passed in dev argument. So the 2 cases for addresses checks are:
1848 * 1. does the address exist in the L3 domain that dev is part of
1849 * (skip_dev_check = true), or
1850 *
1851 * 2. does the address exist on the specific device
1852 * (skip_dev_check = false)
1853 */
c58da4c6 1854int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
232378e8
DA		 1855 const struct net_device *dev, bool skip_dev_check,
1856 int strict, u32 banned_flags)
1da177e4 1857{
3f27fb23 1858 unsigned int hash = inet6_addr_hash(net, addr);
1893ff20 1859 const struct net_device *l3mdev;
eedf042a 1860 struct inet6_ifaddr *ifp;
c58da4c6 1861 u32 ifp_flags;
1da177e4 1862
480318a0 1863 rcu_read_lock();
232378e8 1864
1893ff20 1865 l3mdev = l3mdev_master_dev_rcu(dev);
232378e8
DA		 1866 if (skip_dev_check)
1867 dev = NULL;
1868
b67bfe0d 1869 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1870 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1871 continue;
1893ff20
DA		 1872
1873 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev)
1874 continue;
1875
c58da4c6
EK		 1876 /* Decouple optimistic from tentative for evaluation here.
1877 * Ban optimistic addresses explicitly, when required.
1878 */
1879 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1880 ? (ifp->flags&~IFA_F_TENTATIVE)
1881 : ifp->flags;
1da177e4 1882 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1883 !(ifp_flags&banned_flags) &&
63159f29 1884 (!dev || ifp->idev->dev == dev ||
eedf042a 1885 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
480318a0 1886 rcu_read_unlock();
eedf042a 1887 return 1;
1da177e4
LT		 1888 }
1889 }
5c578aed 1890
480318a0 1891 rcu_read_unlock();
eedf042a 1892 return 0;
1da177e4 1893}
c58da4c6 1894EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1895
1da177e4 1896
7df37ff3
CB		 1897/* Compares an address/prefix_len with addresses on device @dev.
1898 * If one is found it returns true.
1899 */
1900bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1901 const unsigned int prefix_len, struct net_device *dev)
1902{
47e26941
ED		 1903 const struct inet6_ifaddr *ifa;
1904 const struct inet6_dev *idev;
7df37ff3
CB		 1905 bool ret = false;
1906
1907 rcu_read_lock();
1908 idev = __in6_dev_get(dev);
1909 if (idev) {
47e26941 1910 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
7df37ff3
CB		 1911 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1912 if (ret)
1913 break;
1914 }
7df37ff3
CB		 1915 }
1916 rcu_read_unlock();
1917
1918 return ret;
1919}
1920EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1921
b71d1d42 1922int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84 1923{
24ba333b
ED		 1924 const struct inet6_ifaddr *ifa;
1925 const struct inet6_dev *idev;
52eeeb84
YH		 1926 int onlink;
1927
1928 onlink = 0;
1929 rcu_read_lock();
1930 idev = __in6_dev_get(dev);
1931 if (idev) {
24ba333b 1932 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1933 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1934 ifa->prefix_len);
1935 if (onlink)
1936 break;
1937 }
52eeeb84
YH		 1938 }
1939 rcu_read_unlock();
1940 return onlink;
1941}
52eeeb84
YH		 1942EXPORT_SYMBOL(ipv6_chk_prefix);
1943
9acd9f3a 1944struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1945 struct net_device *dev, int strict)
1da177e4 1946{
3f27fb23 1947 unsigned int hash = inet6_addr_hash(net, addr);
b79d1d54 1948 struct inet6_ifaddr *ifp, *result = NULL;
1da177e4 1949
24f226da
ED		 1950 rcu_read_lock();
1951 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1952 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1953 continue;
1da177e4 1954 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1955 if (!dev || ifp->idev->dev == dev ||
1da177e4 1956 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1957 result = ifp;
1da177e4
LT		 1958 in6_ifa_hold(ifp);
1959 break;
1960 }
1961 }
1962 }
24f226da 1963 rcu_read_unlock();
1da177e4 1964
b79d1d54 1965 return result;
1da177e4
LT		 1966}
1967
1da177e4
LT		 1968/* Gets referenced address, destroys ifaddr */
1969
cc411d0b 1970static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1971{
3d171f39
LR		 1972 if (dad_failed)
1973 ifp->flags |= IFA_F_DADFAILED;
1974
ec8add2a 1975 if (ifp->flags&IFA_F_TEMPORARY) {
1da177e4
LT		 1976 struct inet6_ifaddr *ifpub;
1977 spin_lock_bh(&ifp->lock);
1978 ifpub = ifp->ifpub;
1979 if (ifpub) {
1980 in6_ifa_hold(ifpub);
1981 spin_unlock_bh(&ifp->lock);
fffcefe9 1982 ipv6_create_tempaddr(ifpub, ifp, true);
1da177e4
LT		 1983 in6_ifa_put(ifpub);
1984 } else {
1985 spin_unlock_bh(&ifp->lock);
1986 }
1987 ipv6_del_addr(ifp);
ec8add2a
SD		 1988 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
1989 spin_lock_bh(&ifp->lock);
1990 addrconf_del_dad_work(ifp);
1991 ifp->flags |= IFA_F_TENTATIVE;
f1c02cfb
SD		 1992 if (dad_failed)
1993 ifp->flags &= ~IFA_F_OPTIMISTIC;
ec8add2a
SD		 1994 spin_unlock_bh(&ifp->lock);
1995 if (dad_failed)
1996 ipv6_ifa_notify(0, ifp);
1997 in6_ifa_put(ifp);
c15b1cca 1998 } else {
1da177e4 1999 ipv6_del_addr(ifp);
c15b1cca 2000 }
1da177e4
LT		 2001}
2002
f2344a13
HX		 2003static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2004{
2005 int err = -ENOENT;
2006
8e8e676d 2007 spin_lock_bh(&ifp->lock);
f2344a13
HX		 2008 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2009 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2010 err = 0;
2011 }
8e8e676d 2012 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 2013
2014 return err;
2015}
2016
da13c59b 2017void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
3c21edbd 2018{
1b34be74 2019 struct inet6_dev *idev = ifp->idev;
1855b7c3 2020 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 2021
853dc2e0
UB		 2022 if (addrconf_dad_end(ifp)) {
2023 in6_ifa_put(ifp);
f2344a13 2024 return;
853dc2e0 2025 }
f2344a13 2026
da13c59b
VP		 2027 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2028 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
9bdd8d40 2029
5f40ef77
HFS		 2030 spin_lock_bh(&ifp->lock);
2031
2032 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
5f40ef77
HFS		 2033 struct in6_addr new_addr;
2034 struct inet6_ifaddr *ifp2;
5f40ef77 2035 int retries = ifp->stable_privacy_retry + 1;
e6464b8c
DA		 2036 struct ifa6_config cfg = {
2037 .pfx = &new_addr,
2038 .plen = ifp->prefix_len,
2039 .ifa_flags = ifp->flags,
2040 .valid_lft = ifp->valid_lft,
2041 .preferred_lft = ifp->prefered_lft,
2042 .scope = ifp->scope,
2043 };
5f40ef77 2044
1855b7c3 2045 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 2046 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2047 ifp->idev->dev->name);
2048 goto errdad;
2049 }
2050
2051 new_addr = ifp->addr;
2052 if (ipv6_generate_stable_address(&new_addr, retries,
2053 idev))
2054 goto errdad;
2055
5f40ef77 2056 spin_unlock_bh(&ifp->lock);
1b34be74 2057
5f40ef77
HFS		 2058 if (idev->cnf.max_addresses &&
2059 ipv6_count_addresses(idev) >=
2060 idev->cnf.max_addresses)
2061 goto lock_errdad;
2062
2063 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2064 ifp->idev->dev->name);
2065
e6464b8c 2066 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
5f40ef77
HFS		 2067 if (IS_ERR(ifp2))
2068 goto lock_errdad;
2069
2070 spin_lock_bh(&ifp2->lock);
2071 ifp2->stable_privacy_retry = retries;
2072 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2073 spin_unlock_bh(&ifp2->lock);
2074
1855b7c3 2075 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 2076 in6_ifa_put(ifp2);
2077lock_errdad:
2078 spin_lock_bh(&ifp->lock);
1b34be74
YH		 2079 }
2080
5f40ef77 2081errdad:
c15b1cca
HFS		 2082 /* transition from _POSTDAD to _ERRDAD */
2083 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 2084 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 2085
2086 addrconf_mod_dad_work(ifp, 0);
751eb6b6 2087 in6_ifa_put(ifp);
3c21edbd 2088}
1da177e4 2089
a9ed4a29
SD		 2090/* Join to solicited addr multicast group.
2091 * caller must hold RTNL */
b71d1d42 2092void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 2093{
2094 struct in6_addr maddr;
2095
2096 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2097 return;
2098
2099 addrconf_addr_solict_mult(addr, &maddr);
2100 ipv6_dev_mc_inc(dev, &maddr);
2101}
2102
a9ed4a29 2103/* caller must hold RTNL */
b71d1d42 2104void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 2105{
2106 struct in6_addr maddr;
2107
2108 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2109 return;
2110
2111 addrconf_addr_solict_mult(addr, &maddr);
2112 __ipv6_dev_mc_dec(idev, &maddr);
2113}
2114
a9ed4a29 2115/* caller must hold RTNL */
20380731 2116static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2117{
2118 struct in6_addr addr;
c15b1cca 2119
88ad3149 2120 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 2121 return;
1da177e4
LT		 2122 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2123 if (ipv6_addr_any(&addr))
2124 return;
013b4d90 2125 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 2126}
2127
a9ed4a29 2128/* caller must hold RTNL */
20380731 2129static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2130{
2131 struct in6_addr addr;
c15b1cca 2132
88ad3149 2133 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 2134 return;
1da177e4
LT		 2135 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2136 if (ipv6_addr_any(&addr))
2137 return;
2138 __ipv6_dev_ac_dec(ifp->idev, &addr);
2139}
2140
8a7a4b47 2141static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
06a4c1c5 2142{
8a7a4b47
AA		 2143 switch (dev->addr_len) {
2144 case ETH_ALEN:
9dae2e03
LAD		 2145 memcpy(eui, dev->dev_addr, 3);
2146 eui[3] = 0xFF;
2147 eui[4] = 0xFE;
2148 memcpy(eui + 5, dev->dev_addr + 3, 3);
2149 break;
8a7a4b47
AA		 2150 case EUI64_ADDR_LEN:
2151 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2152 eui[0] ^= 2;
2153 break;
2154 default:
06a4c1c5 2155 return -1;
8a7a4b47
AA		 2156 }
2157
06a4c1c5 2158 return 0;
2159}
2160
cb6bf355
YH		 2161static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2162{
2163 union fwnet_hwaddr *ha;
2164
2165 if (dev->addr_len != FWNET_ALEN)
2166 return -1;
2167
2168 ha = (union fwnet_hwaddr *)dev->dev_addr;
2169
2170 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2171 eui[0] ^= 2;
2172 return 0;
2173}
2174
073a8e0e
YH		 2175static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2176{
2177 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2178 if (dev->addr_len != ARCNET_ALEN)
2179 return -1;
2180 memset(eui, 0, 7);
8e5e8f30 2181 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 2182 return 0;
2183}
2184
2185static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2186{
2187 if (dev->addr_len != INFINIBAND_ALEN)
2188 return -1;
2189 memcpy(eui, dev->dev_addr + 12, 8);
2190 eui[0] |= 2;
2191 return 0;
2192}
2193
c61393ea 2194static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2195{
9af28511
SH		 2196 if (addr == 0)
2197 return -1;
dfd982ba
YH		 2198 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2199 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2200 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2201 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2202 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2203 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2204 eui[1] = 0;
2205 eui[2] = 0x5E;
2206 eui[3] = 0xFE;
2207 memcpy(eui + 4, &addr, 4);
2208 return 0;
2209}
dfd982ba
YH		 2210
2211static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2212{
2213 if (dev->priv_flags & IFF_ISATAP)
2214 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2215 return -1;
2216}
2217
aee80b54 2218static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2219{
2220 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2221}
2222
e837735e
ND		 2223static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2224{
2225 memcpy(eui, dev->perm_addr, 3);
2226 memcpy(eui + 5, dev->perm_addr + 3, 3);
2227 eui[3] = 0xFF;
2228 eui[4] = 0xFE;
2229 eui[0] ^= 2;
2230 return 0;
2231}
2232
1da177e4
LT		 2233static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2234{
2235 switch (dev->type) {
2236 case ARPHRD_ETHER:
2237 case ARPHRD_FDDI:
073a8e0e 2238 return addrconf_ifid_eui48(eui, dev);
1da177e4 2239 case ARPHRD_ARCNET:
073a8e0e 2240 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2241 case ARPHRD_INFINIBAND:
073a8e0e 2242 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2243 case ARPHRD_SIT:
dfd982ba 2244 return addrconf_ifid_sit(eui, dev);
aee80b54 2245 case ARPHRD_IPGRE:
45ce0fd1 2246 case ARPHRD_TUNNEL:
aee80b54 2247 return addrconf_ifid_gre(eui, dev);
e74bccb8 2248 case ARPHRD_6LOWPAN:
8a7a4b47 2249 return addrconf_ifid_6lowpan(eui, dev);
cb6bf355
YH		 2250 case ARPHRD_IEEE1394:
2251 return addrconf_ifid_ieee1394(eui, dev);
e837735e 2252 case ARPHRD_TUNNEL6:
45ce0fd1 2253 case ARPHRD_IP6GRE:
9deb441c 2254 case ARPHRD_RAWIP:
e837735e 2255 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2256 }
2257 return -1;
2258}
2259
2260static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2261{
2262 int err = -1;
2263 struct inet6_ifaddr *ifp;
2264
2265 read_lock_bh(&idev->lock);
602582ca
HFS		 2266 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2267 if (ifp->scope > IFA_LINK)
2268 break;
1da177e4
LT		 2269 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2270 memcpy(eui, ifp->addr.s6_addr+8, 8);
2271 err = 0;
2272 break;
2273 }
2274 }
2275 read_unlock_bh(&idev->lock);
2276 return err;
2277}
2278
1da177e4 2279/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
9d6280da 2280static void ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2281{
1da177e4 2282regen:
955189ef 2283 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2284 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2285
2286 /*
2287 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2288 * check if generated address is not inappropriate
2289 *
2290 * - Reserved subnet anycast (RFC 2526)
2291 * 11111101 11....11 1xxxxxxx
c7dc89c0 2292 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2293 * 00-00-5E-FE-xx-xx-xx-xx
2294 * - value 0
2295 * - XXX: already assigned to an address on the device
2296 */
1ab1457c 2297 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2298 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2299 (idev->rndid[7]&0x80))
2300 goto regen;
2301 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2302 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2303 goto regen;
2304 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2305 goto regen;
2306 }
1da177e4
LT		 2307}
2308
9d6280da 2309static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2310{
1da177e4 2311 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
9d6280da 2312 ipv6_regen_rndid(idev);
1da177e4 2313}
1da177e4
LT		 2314
2315/*
2316 * Add prefix route.
2317 */
2318
2319static void
8308f3ff
DA		 2320addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2321 struct net_device *dev, unsigned long expires,
2322 u32 flags, gfp_t gfp_flags)
1da177e4 2323{
86872cb5 2324 struct fib6_config cfg = {
ca254490 2325 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
8308f3ff 2326 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
86872cb5
TG		 2327 .fc_ifindex = dev->ifindex,
2328 .fc_expires = expires,
2329 .fc_dst_len = plen,
2330 .fc_flags = RTF_UP | flags,
c346dca1 2331 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2332 .fc_protocol = RTPROT_KERNEL,
e8478e80 2333 .fc_type = RTN_UNICAST,
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
acb54e3c 2347 ip6_route_add(&cfg, gfp_flags, NULL);
1da177e4
LT		 2348}
2349
14ef37b6 2350
8d1c802b 2351static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
14ef37b6
AH		 2352 int plen,
2353 const struct net_device *dev,
2354 u32 flags, u32 noflags)
2355{
2356 struct fib6_node *fn;
8d1c802b 2357 struct fib6_info *rt = NULL;
14ef37b6 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) {
5e670d84 2371 if (rt->fib6_nh.nh_dev->ifindex != dev->ifindex)
14ef37b6 2372 continue;
93c2fb25 2373 if ((rt->fib6_flags & flags) != flags)
14ef37b6 2374 continue;
93c2fb25 2375 if ((rt->fib6_flags & noflags) != 0)
14ef37b6 2376 continue;
93531c67 2377 fib6_info_hold(rt);
14ef37b6
AH		 2378 break;
2379 }
2380out:
66f5d6ce 2381 rcu_read_unlock();
14ef37b6
AH		 2382 return rt;
2383}
2384
2385
1da177e4
LT		 2386/* Create "default" multicast route to the interface */
2387
2388static void addrconf_add_mroute(struct net_device *dev)
2389{
86872cb5 2390 struct fib6_config cfg = {
ca254490 2391 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2392 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2393 .fc_ifindex = dev->ifindex,
2394 .fc_dst_len = 8,
2395 .fc_flags = RTF_UP,
e8478e80 2396 .fc_type = RTN_UNICAST,
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
acb54e3c 2402 ip6_route_add(&cfg, GFP_ATOMIC, 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;
e6464b8c
DA		 2510 struct ifa6_config cfg = {
2511 .pfx = addr,
2512 .plen = pinfo->prefix_len,
2513 .ifa_flags = addr_flags,
2514 .valid_lft = valid_lft,
2515 .preferred_lft = prefered_lft,
2516 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2517 };
4f672235
AA		 2518
2519#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 2520 if ((net->ipv6.devconf_all->optimistic_dad ||
2521 in6_dev->cnf.optimistic_dad) &&
4f672235 2522 !net->ipv6.devconf_all->forwarding && sllao)
e6464b8c 2523 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
4f672235
AA		 2524#endif
2525
2526 /* Do not allow to create too much of autoconfigured
2527 * addresses; this would be too easy way to crash kernel.
2528 */
2529 if (!max_addresses ||
2530 ipv6_count_addresses(in6_dev) < max_addresses)
e6464b8c 2531 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
4f672235
AA		 2532
2533 if (IS_ERR_OR_NULL(ifp))
2534 return -1;
2535
4f672235
AA		 2536 create = 1;
2537 spin_lock_bh(&ifp->lock);
2538 ifp->flags |= IFA_F_MANAGETEMPADDR;
2539 ifp->cstamp = jiffies;
2540 ifp->tokenized = tokenized;
2541 spin_unlock_bh(&ifp->lock);
2542 addrconf_dad_start(ifp);
2543 }
2544
2545 if (ifp) {
2546 u32 flags;
2547 unsigned long now;
2548 u32 stored_lft;
2549
2550 /* update lifetime (RFC2462 5.5.3 e) */
2551 spin_lock_bh(&ifp->lock);
2552 now = jiffies;
2553 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2554 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2555 else
2556 stored_lft = 0;
f85f94b8 2557 if (!create && stored_lft) {
4f672235
AA		 2558 const u32 minimum_lft = min_t(u32,
2559 stored_lft, MIN_VALID_LIFETIME);
2560 valid_lft = max(valid_lft, minimum_lft);
2561
2562 /* RFC4862 Section 5.5.3e:
2563 * "Note that the preferred lifetime of the
2564 * corresponding address is always reset to
2565 * the Preferred Lifetime in the received
2566 * Prefix Information option, regardless of
2567 * whether the valid lifetime is also reset or
2568 * ignored."
2569 *
2570 * So we should always update prefered_lft here.
2571 */
2572 update_lft = 1;
2573 }
2574
2575 if (update_lft) {
2576 ifp->valid_lft = valid_lft;
2577 ifp->prefered_lft = prefered_lft;
2578 ifp->tstamp = now;
2579 flags = ifp->flags;
2580 ifp->flags &= ~IFA_F_DEPRECATED;
2581 spin_unlock_bh(&ifp->lock);
2582
2583 if (!(flags&IFA_F_TENTATIVE))
2584 ipv6_ifa_notify(0, ifp);
2585 } else
2586 spin_unlock_bh(&ifp->lock);
2587
2588 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2589 create, now);
2590
2591 in6_ifa_put(ifp);
2592 addrconf_verify();
2593 }
2594
2595 return 0;
2596}
cc84b3c6 2597EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
4f672235 2598
e6bff995 2599void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2600{
2601 struct prefix_info *pinfo;
2602 __u32 valid_lft;
2603 __u32 prefered_lft;
4f672235 2604 int addr_type, err;
64236f3f 2605 u32 addr_flags = 0;
1da177e4 2606 struct inet6_dev *in6_dev;
56d417b1 2607 struct net *net = dev_net(dev);
1da177e4
LT		 2608
2609 pinfo = (struct prefix_info *) opt;
1ab1457c 2610
1da177e4 2611 if (len < sizeof(struct prefix_info)) {
e32ac250 2612 netdev_dbg(dev, "addrconf: prefix option too short\n");
1da177e4
LT		 2613 return;
2614 }
1ab1457c 2615
1da177e4
LT		 2616 /*
2617 * Validation checks ([ADDRCONF], page 19)
2618 */
2619
2620 addr_type = ipv6_addr_type(&pinfo->prefix);
2621
2622 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2623 return;
2624
2625 valid_lft = ntohl(pinfo->valid);
2626 prefered_lft = ntohl(pinfo->prefered);
2627
2628 if (prefered_lft > valid_lft) {
e87cc472 2629 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2630 return;
2631 }
2632
2633 in6_dev = in6_dev_get(dev);
2634
63159f29 2635 if (!in6_dev) {
e87cc472
JP		 2636 net_dbg_ratelimited("addrconf: device %s not configured\n",
2637 dev->name);
1da177e4
LT		 2638 return;
2639 }
2640
2641 /*
2642 * Two things going on here:
2643 * 1) Add routes for on-link prefixes
2644 * 2) Configure prefixes with the auto flag set
2645 */
2646
4bed72e4 2647 if (pinfo->onlink) {
8d1c802b 2648 struct fib6_info *rt;
4bed72e4
YH		 2649 unsigned long rt_expires;
2650
6f704992
YH		 2651 /* Avoid arithmetic overflow. Really, we could
2652 * save rt_expires in seconds, likely valid_lft,
2653 * but it would require division in fib gc, that it
2654 * not good.
2655 */
4bed72e4
YH		 2656 if (HZ > USER_HZ)
2657 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2658 else
2659 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2660
4bed72e4
YH		 2661 if (addrconf_finite_timeout(rt_expires))
2662 rt_expires *= HZ;
1da177e4 2663
14ef37b6
AH		 2664 rt = addrconf_get_prefix_route(&pinfo->prefix,
2665 pinfo->prefix_len,
2666 dev,
2667 RTF_ADDRCONF | RTF_PREFIX_RT,
2668 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2669
14ef37b6 2670 if (rt) {
6f704992
YH		 2671 /* Autoconf prefix route */
2672 if (valid_lft == 0) {
afb1d4b5 2673 ip6_del_rt(net, rt);
6f704992 2674 rt = NULL;
4bed72e4 2675 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2676 /* not infinity */
14895687 2677 fib6_set_expires(rt, jiffies + rt_expires);
6f704992 2678 } else {
14895687 2679 fib6_clean_expires(rt);
1da177e4
LT		 2680 }
2681 } else if (valid_lft) {
6f704992 2682 clock_t expires = 0;
4bed72e4
YH		 2683 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2684 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2685 /* not infinity */
2686 flags |= RTF_EXPIRES;
2687 expires = jiffies_to_clock_t(rt_expires);
2688 }
1da177e4 2689 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
8308f3ff
DA		 2690 0, dev, expires, flags,
2691 GFP_ATOMIC);
1da177e4 2692 }
93531c67 2693 fib6_info_release(rt);
1da177e4
LT		 2694 }
2695
2696 /* Try to figure out our local address for this prefix */
2697
2698 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1da177e4 2699 struct in6_addr addr;
f997c55c 2700 bool tokenized = false, dev_addr_generated = false;
1da177e4
LT		 2701
2702 if (pinfo->prefix_len == 64) {
2703 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2704
2705 if (!ipv6_addr_any(&in6_dev->token)) {
2706 read_lock_bh(&in6_dev->lock);
2707 memcpy(addr.s6_addr + 8,
2708 in6_dev->token.s6_addr + 8, 8);
2709 read_unlock_bh(&in6_dev->lock);
617fe29d 2710 tokenized = true;
cc9da6cc 2711 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2712 !ipv6_generate_stable_address(&addr, 0,
2713 in6_dev)) {
64236f3f 2714 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2715 goto ok;
f53adae4
DB		 2716 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2717 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
4f672235 2718 goto put;
f997c55c
AA		 2719 } else {
2720 dev_addr_generated = true;
1da177e4
LT		 2721 }
2722 goto ok;
2723 }
e87cc472
JP		 2724 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2725 pinfo->prefix_len);
4f672235 2726 goto put;
1da177e4
LT		 2727
2728ok:
4f672235
AA		 2729 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2730 &addr, addr_type,
2731 addr_flags, sllao,
2732 tokenized, valid_lft,
2733 prefered_lft);
2734 if (err)
2735 goto put;
f997c55c
AA		 2736
2737 /* Ignore error case here because previous prefix add addr was
2738 * successful which will be notified.
2739 */
2740 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2741 addr_type, addr_flags, sllao,
2742 tokenized, valid_lft,
2743 prefered_lft,
2744 dev_addr_generated);
1da177e4
LT		 2745 }
2746 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
4f672235 2747put:
1da177e4
LT		 2748 in6_dev_put(in6_dev);
2749}
2750
2751/*
2752 * Set destination address.
2753 * Special case for SIT interfaces where we create a new "virtual"
2754 * device.
2755 */
af284937 2756int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2757{
2758 struct in6_ifreq ireq;
2759 struct net_device *dev;
2760 int err = -EINVAL;
2761
2762 rtnl_lock();
2763
2764 err = -EFAULT;
2765 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2766 goto err_exit;
2767
af284937 2768 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2769
2770 err = -ENODEV;
63159f29 2771 if (!dev)
1da177e4
LT		 2772 goto err_exit;
2773
07a93626 2774#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2775 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2776 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2777 struct ifreq ifr;
1da177e4
LT		 2778 struct ip_tunnel_parm p;
2779
2780 err = -EADDRNOTAVAIL;
2781 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2782 goto err_exit;
2783
2784 memset(&p, 0, sizeof(p));
2785 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2786 p.iph.saddr = 0;
2787 p.iph.version = 4;
2788 p.iph.ihl = 5;
2789 p.iph.protocol = IPPROTO_IPV6;
2790 p.iph.ttl = 64;
d20b3109 2791 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2792
5bc3eb7e
SH		 2793 if (ops->ndo_do_ioctl) {
2794 mm_segment_t oldfs = get_fs();
2795
2796 set_fs(KERNEL_DS);
2797 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2798 set_fs(oldfs);
2799 } else
2800 err = -EOPNOTSUPP;
1da177e4
LT		 2801
2802 if (err == 0) {
2803 err = -ENOBUFS;
af284937
DL		 2804 dev = __dev_get_by_name(net, p.name);
2805 if (!dev)
1da177e4
LT		 2806 goto err_exit;
2807 err = dev_open(dev);
2808 }
2809 }
0be669bb 2810#endif
1da177e4
LT		 2811
2812err_exit:
2813 rtnl_unlock();
2814 return err;
2815}
2816
93a714d6
MC		 2817static int ipv6_mc_config(struct sock *sk, bool join,
2818 const struct in6_addr *addr, int ifindex)
2819{
2820 int ret;
2821
2822 ASSERT_RTNL();
2823
2824 lock_sock(sk);
2825 if (join)
54ff9ef3 2826 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2827 else
54ff9ef3 2828 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2829 release_sock(sk);
2830
2831 return ret;
2832}
2833
1da177e4
LT		 2834/*
2835 * Manual configuration of address on an interface
2836 */
479840ff 2837static int inet6_addr_add(struct net *net, int ifindex,
19b1518c 2838 struct ifa6_config *cfg,
de95e047 2839 struct netlink_ext_ack *extack)
1da177e4
LT		 2840{
2841 struct inet6_ifaddr *ifp;
2842 struct inet6_dev *idev;
2843 struct net_device *dev;
93a714d6
MC		 2844 unsigned long timeout;
2845 clock_t expires;
6f704992 2846 u32 flags;
1da177e4
LT		 2847
2848 ASSERT_RTNL();
1ab1457c 2849
19b1518c 2850 if (cfg->plen > 128)
24ef0da7
TG		 2851 return -EINVAL;
2852
0778769d 2853 /* check the lifetime */
19b1518c 2854 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
0778769d
NT		 2855 return -EINVAL;
2856
19b1518c 2857 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
53bd6749
JP		 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
19b1518c 2868 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
93a714d6 2869 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
19b1518c 2870 true, cfg->pfx, ifindex);
93a714d6
MC		 2871
2872 if (ret < 0)
2873 return ret;
2874 }
2875
19b1518c 2876 cfg->scope = ipv6_addr_scope(cfg->pfx);
1da177e4 2877
19b1518c 2878 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4bed72e4
YH		 2879 if (addrconf_finite_timeout(timeout)) {
2880 expires = jiffies_to_clock_t(timeout * HZ);
19b1518c 2881 cfg->valid_lft = timeout;
6f704992 2882 flags = RTF_EXPIRES;
4bed72e4
YH		 2883 } else {
2884 expires = 0;
2885 flags = 0;
19b1518c 2886 cfg->ifa_flags |= IFA_F_PERMANENT;
6f704992 2887 }
0778769d 2888
19b1518c 2889 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4bed72e4
YH		 2890 if (addrconf_finite_timeout(timeout)) {
2891 if (timeout == 0)
19b1518c
DA		 2892 cfg->ifa_flags |= IFA_F_DEPRECATED;
2893 cfg->preferred_lft = timeout;
4bed72e4 2894 }
0778769d 2895
19b1518c 2896 ifp = ipv6_add_addr(idev, cfg, true, extack);
1da177e4 2897 if (!IS_ERR(ifp)) {
19b1518c 2898 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
8308f3ff
DA		 2899 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2900 ifp->rt_priority, dev, expires,
2901 flags, GFP_KERNEL);
761aac73
TH		 2902 }
2903
a2d481b3
LB		 2904 /* Send a netlink notification if DAD is enabled and
2905 * optimistic flag is not set
2906 */
2907 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2908 ipv6_ifa_notify(0, ifp);
95c385b4
NH		 2909 /*
2910 * Note that section 3.1 of RFC 4429 indicates
2911 * that the Optimistic flag should not be set for
2912 * manually configured addresses
2913 */
cf22f9a2 2914 addrconf_dad_start(ifp);
19b1518c
DA		 2915 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2916 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2917 cfg->preferred_lft, true, jiffies);
1da177e4 2918 in6_ifa_put(ifp);
c15b1cca 2919 addrconf_verify_rtnl();
1da177e4 2920 return 0;
19b1518c
DA		 2921 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2922 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
2923 cfg->pfx, ifindex);
1da177e4
LT		 2924 }
2925
2926 return PTR_ERR(ifp);
2927}
2928
6046d5b4
HK		 2929static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2930 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2931{
2932 struct inet6_ifaddr *ifp;
2933 struct inet6_dev *idev;
2934 struct net_device *dev;
1ab1457c 2935
24ef0da7
TG		 2936 if (plen > 128)
2937 return -EINVAL;
2938
af284937
DL		 2939 dev = __dev_get_by_index(net, ifindex);
2940 if (!dev)
1da177e4
LT		 2941 return -ENODEV;
2942
e5d08d71 2943 idev = __in6_dev_get(dev);
63159f29 2944 if (!idev)
1da177e4
LT		 2945 return -ENXIO;
2946
2947 read_lock_bh(&idev->lock);
502a2ffd 2948 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2949 if (ifp->prefix_len == plen &&
2950 ipv6_addr_equal(pfx, &ifp->addr)) {
2951 in6_ifa_hold(ifp);
2952 read_unlock_bh(&idev->lock);
1ab1457c 2953
6046d5b4
HK		 2954 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2955 (ifa_flags & IFA_F_MANAGETEMPADDR))
2956 manage_tempaddrs(idev, ifp, 0, 0, false,
2957 jiffies);
1da177e4 2958 ipv6_del_addr(ifp);
6046d5b4 2959 addrconf_verify_rtnl();
93a714d6
MC		 2960 if (ipv6_addr_is_multicast(pfx)) {
2961 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2962 false, pfx, dev->ifindex);
2963 }
1da177e4
LT		 2964 return 0;
2965 }
2966 }
2967 read_unlock_bh(&idev->lock);
2968 return -EADDRNOTAVAIL;
2969}
2970
2971
af284937 2972int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4 2973{
19b1518c
DA		 2974 struct ifa6_config cfg = {
2975 .ifa_flags = IFA_F_PERMANENT,
2976 .preferred_lft = INFINITY_LIFE_TIME,
2977 .valid_lft = INFINITY_LIFE_TIME,
2978 };
1da177e4
LT		 2979 struct in6_ifreq ireq;
2980 int err;
1ab1457c 2981
af31f412 2982 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2983 return -EPERM;
1ab1457c 2984
1da177e4
LT		 2985 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2986 return -EFAULT;
2987
19b1518c
DA		 2988 cfg.pfx = &ireq.ifr6_addr;
2989 cfg.plen = ireq.ifr6_prefixlen;
2990
1da177e4 2991 rtnl_lock();
19b1518c 2992 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
1da177e4
LT		 2993 rtnl_unlock();
2994 return err;
2995}
2996
af284937 2997int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2998{
2999 struct in6_ifreq ireq;
3000 int err;
1ab1457c 3001
af31f412 3002 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 3003 return -EPERM;
3004
3005 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3006 return -EFAULT;
3007
3008 rtnl_lock();
6046d5b4 3009 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 3010 ireq.ifr6_prefixlen);
1da177e4
LT		 3011 rtnl_unlock();
3012 return err;
3013}
3014
b5f348e5
IJ		 3015static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3016 int plen, int scope)
3017{
3018 struct inet6_ifaddr *ifp;
e6464b8c
DA		 3019 struct ifa6_config cfg = {
3020 .pfx = addr,
3021 .plen = plen,
3022 .ifa_flags = IFA_F_PERMANENT,
3023 .valid_lft = INFINITY_LIFE_TIME,
3024 .preferred_lft = INFINITY_LIFE_TIME,
3025 .scope = scope
3026 };
b5f348e5 3027
e6464b8c 3028 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
b5f348e5
IJ		 3029 if (!IS_ERR(ifp)) {
3030 spin_lock_bh(&ifp->lock);
3031 ifp->flags &= ~IFA_F_TENTATIVE;
3032 spin_unlock_bh(&ifp->lock);
764d3be6 3033 rt_genid_bump_ipv6(dev_net(idev->dev));
b5f348e5
IJ		 3034 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3035 in6_ifa_put(ifp);
3036 }
3037}
3038
07a93626 3039#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3040static void sit_add_v4_addrs(struct inet6_dev *idev)
3041{
1da177e4
LT		 3042 struct in6_addr addr;
3043 struct net_device *dev;
c346dca1 3044 struct net *net = dev_net(idev->dev);
929c9cf3 3045 int scope, plen;
f0e2acfa 3046 u32 pflags = 0;
1da177e4
LT		 3047
3048 ASSERT_RTNL();
3049
3050 memset(&addr, 0, sizeof(struct in6_addr));
3051 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3052
3053 if (idev->dev->flags&IFF_POINTOPOINT) {
3054 addr.s6_addr32[0] = htonl(0xfe800000);
3055 scope = IFA_LINK;
929c9cf3 3056 plen = 64;
1da177e4
LT		 3057 } else {
3058 scope = IPV6_ADDR_COMPATv4;
929c9cf3 3059 plen = 96;
f0e2acfa 3060 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 3061 }
3062
3063 if (addr.s6_addr32[3]) {
929c9cf3 3064 add_addr(idev, &addr, plen, scope);
8308f3ff 3065 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
acb54e3c 3066 GFP_ATOMIC);
1da177e4
LT		 3067 return;
3068 }
3069
6fda7350 3070 for_each_netdev(net, dev) {
8e5e8f30 3071 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 3072 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 3073 struct in_ifaddr *ifa;
1da177e4
LT		 3074
3075 int flag = scope;
3076
3077 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 3078
3079 addr.s6_addr32[3] = ifa->ifa_local;
3080
3081 if (ifa->ifa_scope == RT_SCOPE_LINK)
3082 continue;
3083 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3084 if (idev->dev->flags&IFF_POINTOPOINT)
3085 continue;
3086 flag |= IFA_HOST;
3087 }
1da177e4 3088
b5f348e5 3089 add_addr(idev, &addr, plen, flag);
8308f3ff
DA		 3090 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3091 0, pflags, GFP_ATOMIC);
1da177e4
LT		 3092 }
3093 }
1ab1457c 3094 }
1da177e4 3095}
0be669bb 3096#endif
1da177e4
LT		 3097
3098static void init_loopback(struct net_device *dev)
3099{
3100 struct inet6_dev *idev;
1da177e4
LT		 3101
3102 /* ::1 */
3103
3104 ASSERT_RTNL();
3105
e5d08d71 3106 idev = ipv6_find_idev(dev);
63159f29 3107 if (!idev) {
91df42be 3108 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3109 return;
3110 }
3111
b5f348e5 3112 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 3113}
3114
2ad3ed59
AA		 3115void addrconf_add_linklocal(struct inet6_dev *idev,
3116 const struct in6_addr *addr, u32 flags)
1da177e4 3117{
e6464b8c
DA		 3118 struct ifa6_config cfg = {
3119 .pfx = addr,
3120 .plen = 64,
3121 .ifa_flags = flags | IFA_F_PERMANENT,
3122 .valid_lft = INFINITY_LIFE_TIME,
3123 .preferred_lft = INFINITY_LIFE_TIME,
3124 .scope = IFA_LINK
3125 };
8e5e8f30 3126 struct inet6_ifaddr *ifp;
95c385b4
NH		 3127
3128#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 3129 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3130 idev->cnf.optimistic_dad) &&
702beb87 3131 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
e6464b8c 3132 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
95c385b4 3133#endif
1da177e4 3134
e6464b8c 3135 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
1da177e4 3136 if (!IS_ERR(ifp)) {
8308f3ff 3137 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
acb54e3c 3138 0, 0, GFP_ATOMIC);
cf22f9a2 3139 addrconf_dad_start(ifp);
1da177e4
LT		 3140 in6_ifa_put(ifp);
3141 }
3142}
2ad3ed59 3143EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
1da177e4 3144
622c81d5
HFS		 3145static bool ipv6_reserved_interfaceid(struct in6_addr address)
3146{
3147 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3148 return true;
3149
3150 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3151 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3152 return true;
3153
3154 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3155 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3156 return true;
3157
3158 return false;
3159}
3160
3161static int ipv6_generate_stable_address(struct in6_addr *address,
3162 u8 dad_count,
3163 const struct inet6_dev *idev)
3164{
622c81d5
HFS		 3165 static DEFINE_SPINLOCK(lock);
3166 static __u32 digest[SHA_DIGEST_WORDS];
3167 static __u32 workspace[SHA_WORKSPACE_WORDS];
3168
3169 static union {
3170 char __data[SHA_MESSAGE_BYTES];
3171 struct {
3172 struct in6_addr secret;
ff40217e 3173 __be32 prefix[2];
622c81d5
HFS		 3174 unsigned char hwaddr[MAX_ADDR_LEN];
3175 u8 dad_count;
3176 } __packed;
3177 } data;
3178
3179 struct in6_addr secret;
3180 struct in6_addr temp;
3181 struct net *net = dev_net(idev->dev);
3182
3183 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3184
3185 if (idev->cnf.stable_secret.initialized)
3186 secret = idev->cnf.stable_secret.secret;
3187 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3188 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3189 else
3190 return -1;
3191
3192retry:
3193 spin_lock_bh(&lock);
3194
3195 sha_init(digest);
3196 memset(&data, 0, sizeof(data));
3197 memset(workspace, 0, sizeof(workspace));
3198 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3199 data.prefix[0] = address->s6_addr32[0];
3200 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3201 data.secret = secret;
3202 data.dad_count = dad_count;
3203
3204 sha_transform(digest, data.__data, workspace);
3205
3206 temp = *address;
ff40217e
HFS		 3207 temp.s6_addr32[2] = (__force __be32)digest[0];
3208 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3209
3210 spin_unlock_bh(&lock);
3211
3212 if (ipv6_reserved_interfaceid(temp)) {
3213 dad_count++;
1855b7c3 3214 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3215 return -1;
3216 goto retry;
3217 }
3218
3219 *address = temp;
3220 return 0;
3221}
3222
cc9da6cc
BM		 3223static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3224{
3225 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3226
3227 if (s->initialized)
3228 return;
3229 s = &idev->cnf.stable_secret;
3230 get_random_bytes(&s->secret, sizeof(s->secret));
3231 s->initialized = true;
3232}
3233
bc91b0f0
JP		 3234static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3235{
622c81d5
HFS		 3236 struct in6_addr addr;
3237
ca254490
DA		 3238 /* no link local addresses on L3 master devices */
3239 if (netif_is_l3_master(idev->dev))
3240 return;
3241
622c81d5 3242 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3243
d35a00b8 3244 switch (idev->cnf.addr_gen_mode) {
cc9da6cc
BM		 3245 case IN6_ADDR_GEN_MODE_RANDOM:
3246 ipv6_gen_mode_random_init(idev);
3247 /* fallthrough */
3248 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3249 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3250 addrconf_add_linklocal(idev, &addr,
3251 IFA_F_STABLE_PRIVACY);
622c81d5 3252 else if (prefix_route)
8308f3ff 3253 addrconf_prefix_route(&addr, 64, 0, idev->dev,
acb54e3c 3254 0, 0, GFP_KERNEL);
cc9da6cc
BM		 3255 break;
3256 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3257 /* addrconf_add_linklocal also adds a prefix_route and we
3258 * only need to care about prefix routes if ipv6_generate_eui64
3259 * couldn't generate one.
3260 */
3261 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3262 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0 3263 else if (prefix_route)
8308f3ff 3264 addrconf_prefix_route(&addr, 64, 0, idev->dev,
27b10608 3265 0, 0, GFP_KERNEL);
cc9da6cc
BM		 3266 break;
3267 case IN6_ADDR_GEN_MODE_NONE:
3268 default:
3269 /* will not add any link local address */
3270 break;
bc91b0f0
JP		 3271 }
3272}
3273
1da177e4
LT		 3274static void addrconf_dev_config(struct net_device *dev)
3275{
8e5e8f30 3276 struct inet6_dev *idev;
1da177e4
LT		 3277
3278 ASSERT_RTNL();
3279
74235a25
HX		 3280 if ((dev->type != ARPHRD_ETHER) &&
3281 (dev->type != ARPHRD_FDDI) &&
74235a25 3282 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3283 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3284 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3285 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc 3286 (dev->type != ARPHRD_6LOWPAN) &&
45ce0fd1
FJ		 3287 (dev->type != ARPHRD_IP6GRE) &&
3288 (dev->type != ARPHRD_IPGRE) &&
3289 (dev->type != ARPHRD_TUNNEL) &&
9deb441c
SAK		 3290 (dev->type != ARPHRD_NONE) &&
3291 (dev->type != ARPHRD_RAWIP)) {
74235a25
HX		 3292 /* Alas, we support only Ethernet autoconfiguration. */
3293 return;
3294 }
3295
1da177e4 3296 idev = addrconf_add_dev(dev);
64e724f6 3297 if (IS_ERR(idev))
1da177e4
LT		 3298 return;
3299
cc9da6cc
BM		 3300 /* this device type has no EUI support */
3301 if (dev->type == ARPHRD_NONE &&
d35a00b8
FJ		 3302 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3303 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc 3304
bc91b0f0 3305 addrconf_addr_gen(idev, false);
1da177e4
LT		 3306}
3307
07a93626 3308#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3309static void addrconf_sit_config(struct net_device *dev)
3310{
3311 struct inet6_dev *idev;
3312
3313 ASSERT_RTNL();
3314
1ab1457c
YH		 3315 /*
3316 * Configure the tunnel with one of our IPv4
3317 * addresses... we should configure all of
1da177e4
LT		 3318 * our v4 addrs in the tunnel
3319 */
3320
e5d08d71 3321 idev = ipv6_find_idev(dev);
63159f29 3322 if (!idev) {
91df42be 3323 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3324 return;
3325 }
3326
c7dc89c0 3327 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3328 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3329 return;
3330 }
3331
1da177e4
LT		 3332 sit_add_v4_addrs(idev);
3333
62b54dd9 3334 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3335 addrconf_add_mroute(dev);
1da177e4 3336}
0be669bb 3337#endif
1da177e4 3338
07a93626 3339#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3340static void addrconf_gre_config(struct net_device *dev)
3341{
3342 struct inet6_dev *idev;
aee80b54 3343
aee80b54 3344 ASSERT_RTNL();
3345
e5d08d71 3346 idev = ipv6_find_idev(dev);
63159f29 3347 if (!idev) {
91df42be 3348 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3349 return;
3350 }
3351
bc91b0f0 3352 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3353 if (dev->flags & IFF_POINTOPOINT)
3354 addrconf_add_mroute(dev);
aee80b54 3355}
3356#endif
3357
afb1d4b5
DA		 3358static int fixup_permanent_addr(struct net *net,
3359 struct inet6_dev *idev,
f1705ec1
DA		 3360 struct inet6_ifaddr *ifp)
3361{
93c2fb25 3362 /* !fib6_node means the host route was removed from the
8048ced9
DA		 3363 * FIB, for example, if 'lo' device is taken down. In that
3364 * case regenerate the host route.
3365 */
93c2fb25 3366 if (!ifp->rt || !ifp->rt->fib6_node) {
360a9887 3367 struct fib6_info *f6i, *prev;
f1705ec1 3368
360a9887
DA		 3369 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3370 GFP_ATOMIC);
3371 if (IS_ERR(f6i))
3372 return PTR_ERR(f6i);
f1705ec1 3373
8048ced9
DA		 3374 /* ifp->rt can be accessed outside of rtnl */
3375 spin_lock(&ifp->lock);
3376 prev = ifp->rt;
360a9887 3377 ifp->rt = f6i;
8048ced9
DA		 3378 spin_unlock(&ifp->lock);
3379
93531c67 3380 fib6_info_release(prev);
f1705ec1
DA		 3381 }
3382
3383 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3384 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
8308f3ff
DA		 3385 ifp->rt_priority, idev->dev, 0, 0,
3386 GFP_ATOMIC);
f1705ec1
DA		 3387 }
3388
6d717134
DA		 3389 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3390 addrconf_dad_start(ifp);
f1705ec1
DA		 3391
3392 return 0;
3393}
3394
afb1d4b5 3395static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
f1705ec1
DA		 3396{
3397 struct inet6_ifaddr *ifp, *tmp;
3398 struct inet6_dev *idev;
3399
3400 idev = __in6_dev_get(dev);
3401 if (!idev)
3402 return;
3403
3404 write_lock_bh(&idev->lock);
3405
3406 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3407 if ((ifp->flags & IFA_F_PERMANENT) &&
afb1d4b5 3408 fixup_permanent_addr(net, idev, ifp) < 0) {
f1705ec1 3409 write_unlock_bh(&idev->lock);
e669b869 3410 in6_ifa_hold(ifp);
f1705ec1
DA		 3411 ipv6_del_addr(ifp);
3412 write_lock_bh(&idev->lock);
3413
3414 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3415 idev->dev->name, &ifp->addr);
3416 }
3417 }
3418
3419 write_unlock_bh(&idev->lock);
3420}
3421
1ab1457c 3422static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3423 void *ptr)
1da177e4 3424{
351638e7 3425 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4f7f34ea 3426 struct netdev_notifier_changeupper_info *info;
748e2d93 3427 struct inet6_dev *idev = __in6_dev_get(dev);
60abc0be 3428 struct net *net = dev_net(dev);
c5e33bdd 3429 int run_pending = 0;
b217d616 3430 int err;
1da177e4 3431
e21e8467 3432 switch (event) {
45ba9dd2 3433 case NETDEV_REGISTER:
74235a25 3434 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3435 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3436 if (IS_ERR(idev))
3437 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3438 }
3439 break;
bcdd553f 3440
b7b0b1d2
AD		 3441 case NETDEV_CHANGEMTU:
3442 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3443 if (dev->mtu < IPV6_MIN_MTU) {
60abc0be 3444 addrconf_ifdown(dev, dev != net->loopback_dev);
b7b0b1d2
AD		 3445 break;
3446 }
3447
3448 if (idev) {
3449 rt6_mtu_change(dev, dev->mtu);
3450 idev->cnf.mtu6 = dev->mtu;
3451 break;
3452 }
3453
3454 /* allocate new idev */
3455 idev = ipv6_add_dev(dev);
3456 if (IS_ERR(idev))
3457 break;
3458
3459 /* device is still not ready */
3460 if (!(idev->if_flags & IF_READY))
3461 break;
3462
3463 run_pending = 1;
3464
3465 /* fall through */
3466
1da177e4 3467 case NETDEV_UP:
3c21edbd 3468 case NETDEV_CHANGE:
c2edacf8
JV		 3469 if (dev->flags & IFF_SLAVE)
3470 break;
3471
3ce62a84
WC		 3472 if (idev && idev->cnf.disable_ipv6)
3473 break;
3474
3c21edbd 3475 if (event == NETDEV_UP) {
38bd10c4 3476 /* restore routes for permanent addresses */
afb1d4b5 3477 addrconf_permanent_addr(net, dev);
38bd10c4 3478
1f372c7b 3479 if (!addrconf_link_ready(dev)) {
3c21edbd 3480 /* device is not ready yet. */
f3213831 3481 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3482 dev->name);
3483 break;
3484 }
99081049 3485
d31c7b8f
EP		 3486 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3487 idev = ipv6_add_dev(dev);
3488
a317a2f1 3489 if (!IS_ERR_OR_NULL(idev)) {
99081049 3490 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3491 run_pending = 1;
3492 }
b7b0b1d2 3493 } else if (event == NETDEV_CHANGE) {
1f372c7b 3494 if (!addrconf_link_ready(dev)) {
3c21edbd 3495 /* device is still not ready. */
27c6fa73 3496 rt6_sync_down_dev(dev, event);
3c21edbd
YH		 3497 break;
3498 }
3499
3500 if (idev) {
a088d1d7
LL		 3501 if (idev->if_flags & IF_READY) {
3502 /* device is already configured -
3503 * but resend MLD reports, we might
3504 * have roamed and need to update
3505 * multicast snooping switches
3506 */
3507 ipv6_mc_up(idev);
27c6fa73 3508 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3c21edbd 3509 break;
a088d1d7 3510 }
3c21edbd
YH		 3511 idev->if_flags |= IF_READY;
3512 }
3513
f3213831
JP		 3514 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3515 dev->name);
3c21edbd 3516
c5e33bdd 3517 run_pending = 1;
3c21edbd
YH		 3518 }
3519
e21e8467 3520 switch (dev->type) {
07a93626 3521#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3522 case ARPHRD_SIT:
3523 addrconf_sit_config(dev);
3524 break;
aee80b54 3525#endif
07a93626 3526#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3527 case ARPHRD_IPGRE:
3528 addrconf_gre_config(dev);
3529 break;
0be669bb 3530#endif
1da177e4
LT		 3531 case ARPHRD_LOOPBACK:
3532 init_loopback(dev);
3533 break;
3534
3535 default:
3536 addrconf_dev_config(dev);
3537 break;
3ff50b79 3538 }
bcdd553f 3539
a317a2f1 3540 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3541 if (run_pending)
3542 addrconf_dad_run(idev);
3543
2127d95a
IS		 3544 /* Device has an address by now */
3545 rt6_sync_up(dev, RTNH_F_DEAD);
3546
bcdd553f
SH		 3547 /*
3548 * If the MTU changed during the interface down,
3549 * when the interface up, the changed MTU must be
3550 * reflected in the idev as well as routers.
1da177e4 3551 */
bcdd553f
SH		 3552 if (idev->cnf.mtu6 != dev->mtu &&
3553 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3554 rt6_mtu_change(dev, dev->mtu);
3555 idev->cnf.mtu6 = dev->mtu;
3556 }
3557 idev->tstamp = jiffies;
3558 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3559
3560 /*
3561 * If the changed mtu during down is lower than
3562 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3563 */
3564 if (dev->mtu < IPV6_MIN_MTU)
60abc0be 3565 addrconf_ifdown(dev, dev != net->loopback_dev);
1da177e4
LT		 3566 }
3567 break;
3568
1da177e4
LT		 3569 case NETDEV_DOWN:
3570 case NETDEV_UNREGISTER:
3571 /*
3572 * Remove all addresses from this interface.
3573 */
3574 addrconf_ifdown(dev, event != NETDEV_DOWN);
3575 break;
3c21edbd 3576
1da177e4 3577 case NETDEV_CHANGENAME:
1da177e4 3578 if (idev) {
5632c515 3579 snmp6_unregister_dev(idev);
408c4768 3580 addrconf_sysctl_unregister(idev);
a317a2f1 3581 err = addrconf_sysctl_register(idev);
b217d616
HX		 3582 if (err)
3583 return notifier_from_errno(err);
a317a2f1
WC		 3584 err = snmp6_register_dev(idev);
3585 if (err) {
3586 addrconf_sysctl_unregister(idev);
3587 return notifier_from_errno(err);
3588 }
5632c515 3589 }
1da177e4 3590 break;
bcdd553f 3591
93d9b7d7
JP		 3592 case NETDEV_PRE_TYPE_CHANGE:
3593 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3594 if (idev)
3595 addrconf_type_change(dev, event);
75c78500 3596 break;
4f7f34ea
DA		 3597
3598 case NETDEV_CHANGEUPPER:
3599 info = ptr;
3600
3601 /* flush all routes if dev is linked to or unlinked from
3602 * an L3 master device (e.g., VRF)
3603 */
3604 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3605 addrconf_ifdown(dev, 0);
3ff50b79 3606 }
1da177e4
LT		 3607
3608 return NOTIFY_OK;
3609}
3610
3611/*
3612 * addrconf module should be notified of a device going up
3613 */
3614static struct notifier_block ipv6_dev_notf = {
3615 .notifier_call = addrconf_notify,
242d3a49 3616 .priority = ADDRCONF_NOTIFY_PRIORITY,
1da177e4
LT		 3617};
3618
93d9b7d7 3619static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3620{
3621 struct inet6_dev *idev;
3622 ASSERT_RTNL();
3623
3624 idev = __in6_dev_get(dev);
3625
93d9b7d7 3626 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3627 ipv6_mc_remap(idev);
93d9b7d7 3628 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3629 ipv6_mc_unmap(idev);
3630}
3631
70af921d
DA		 3632static bool addr_is_local(const struct in6_addr *addr)
3633{
3634 return ipv6_addr_type(addr) &
3635 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3636}
3637
1da177e4
LT		 3638static int addrconf_ifdown(struct net_device *dev, int how)
3639{
4c981e28 3640 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN;
c346dca1 3641 struct net *net = dev_net(dev);
502a2ffd 3642 struct inet6_dev *idev;
f1705ec1 3643 struct inet6_ifaddr *ifa, *tmp;
0aef78aa 3644 bool keep_addr = false;
73a8bd74 3645 int state, i;
1da177e4
LT		 3646
3647 ASSERT_RTNL();
3648
4c981e28 3649 rt6_disable_ip(dev, event);
1da177e4
LT		 3650
3651 idev = __in6_dev_get(dev);
63159f29 3652 if (!idev)
1da177e4
LT		 3653 return -ENODEV;
3654
bcdd553f
SH		 3655 /*
3656 * Step 1: remove reference to ipv6 device from parent device.
3657 * Do not dev_put!
1da177e4 3658 */
439e2385 3659 if (how) {
1da177e4 3660 idev->dead = 1;
8814c4b5
YH		 3661
3662 /* protected by rtnl_lock */
a9b3cd7f 3663 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3664
3665 /* Step 1.5: remove snmp6 entry */
3666 snmp6_unregister_dev(idev);
3667
3668 }
3669
f1705ec1
DA		 3670 /* combine the user config with event to determine if permanent
3671 * addresses are to be removed from address hash table
3672 */
0aef78aa
IV		 3673 if (!how && !idev->cnf.disable_ipv6) {
3674 /* aggregate the system setting and interface setting */
3675 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3676
3677 if (!_keep_addr)
3678 _keep_addr = idev->cnf.keep_addr_on_down;
3679
3680 keep_addr = (_keep_addr > 0);
3681 }
f1705ec1 3682
73a8bd74
DM		 3683 /* Step 2: clear hash table */
3684 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3685 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3686
3687 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3688restart:
b67bfe0d 3689 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3690 if (ifa->idev == idev) {
c15b1cca 3691 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3692 /* combined flag + permanent flag decide if
3693 * address is retained on a down event
3694 */
3695 if (!keep_addr ||
70af921d
DA		 3696 !(ifa->flags & IFA_F_PERMANENT) ||
3697 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3698 hlist_del_init_rcu(&ifa->addr_lst);
3699 goto restart;
3700 }
73a8bd74
DM		 3701 }
3702 }
3703 spin_unlock_bh(&addrconf_hash_lock);
3704 }
3705
1da177e4
LT		 3706 write_lock_bh(&idev->lock);
3707
b7b1bfce
HFS		 3708 addrconf_del_rs_timer(idev);
3709
bcdd553f 3710 /* Step 2: clear flags for stateless addrconf */
439e2385 3711 if (!how)
3c21edbd 3712 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3713
bcdd553f 3714 /* Step 3: clear tempaddr list */
372e6c8f 3715 while (!list_empty(&idev->tempaddr_list)) {
3716 ifa = list_first_entry(&idev->tempaddr_list,
3717 struct inet6_ifaddr, tmp_list);
3718 list_del(&ifa->tmp_list);
1da177e4
LT		 3719 write_unlock_bh(&idev->lock);
3720 spin_lock_bh(&ifa->lock);
3721
3722 if (ifa->ifpub) {
3723 in6_ifa_put(ifa->ifpub);
3724 ifa->ifpub = NULL;
3725 }
3726 spin_unlock_bh(&ifa->lock);
3727 in6_ifa_put(ifa);
3728 write_lock_bh(&idev->lock);
3729 }
8f37ada5 3730
f1705ec1 3731 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
8d1c802b 3732 struct fib6_info *rt = NULL;
a2d6cbb0 3733 bool keep;
38bd10c4 3734
f1705ec1 3735 addrconf_del_dad_work(ifa);
84e8b803 3736
a2d6cbb0
RV		 3737 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3738 !addr_is_local(&ifa->addr);
a2d6cbb0 3739
73a8bd74 3740 write_unlock_bh(&idev->lock);
8e8e676d 3741 spin_lock_bh(&ifa->lock);
f1705ec1 3742
a2d6cbb0 3743 if (keep) {
f1705ec1
DA		 3744 /* set state to skip the notifier below */
3745 state = INET6_IFADDR_STATE_DEAD;
6d717134 3746 ifa->state = INET6_IFADDR_STATE_PREDAD;
f1705ec1
DA		 3747 if (!(ifa->flags & IFA_F_NODAD))
3748 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3749
3750 rt = ifa->rt;
3751 ifa->rt = NULL;
f1705ec1
DA		 3752 } else {
3753 state = ifa->state;
3754 ifa->state = INET6_IFADDR_STATE_DEAD;
f1705ec1
DA		 3755 }
3756
8e8e676d 3757 spin_unlock_bh(&ifa->lock);
9d82ca98 3758
38bd10c4 3759 if (rt)
afb1d4b5 3760 ip6_del_rt(net, rt);
38bd10c4 3761
73a8bd74
DM		 3762 if (state != INET6_IFADDR_STATE_DEAD) {
3763 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3764 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
ea06f717
MM		 3765 } else {
3766 if (idev->cnf.forwarding)
3767 addrconf_leave_anycast(ifa);
3768 addrconf_leave_solict(ifa->idev, &ifa->addr);
27bdb2ab 3769 }
8f37ada5 3770
73a8bd74 3771 write_lock_bh(&idev->lock);
8ef802aa
ED		 3772 if (!keep) {
3773 list_del_rcu(&ifa->if_list);
3774 in6_ifa_put(ifa);
3775 }
73a8bd74 3776 }
8f37ada5 3777
1da177e4
LT		 3778 write_unlock_bh(&idev->lock);
3779
381f4dca
SD		 3780 /* Step 5: Discard anycast and multicast list */
3781 if (how) {
3782 ipv6_ac_destroy_dev(idev);
1da177e4 3783 ipv6_mc_destroy_dev(idev);
381f4dca 3784 } else {
1da177e4 3785 ipv6_mc_down(idev);
381f4dca 3786 }
1da177e4 3787
1da177e4 3788 idev->tstamp = jiffies;
1ab1457c 3789
bcdd553f 3790 /* Last: Shot the device (if unregistered) */
439e2385 3791 if (how) {
408c4768 3792 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3793 neigh_parms_release(&nd_tbl, idev->nd_parms);
3794 neigh_ifdown(&nd_tbl, dev);
3795 in6_dev_put(idev);
3796 }
3797 return 0;
3798}
3799
e99e88a9 3800static void addrconf_rs_timer(struct timer_list *t)
1da177e4 3801{
e99e88a9 3802 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
caf92bc4 3803 struct net_device *dev = idev->dev;
b7b1bfce 3804 struct in6_addr lladdr;
1da177e4 3805
b7b1bfce 3806 write_lock(&idev->lock);
5b2a1953 3807 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3808 goto out;
3809
9ba2add3 3810 if (!ipv6_accept_ra(idev))
5b2a1953 3811 goto out;
3812
3813 /* Announcement received after solicitation was sent */
3814 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3815 goto out;
1da177e4 3816
bd11f074 3817 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
caf92bc4
CW		 3818 write_unlock(&idev->lock);
3819 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3820 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3821 &in6addr_linklocal_allrouters);
3822 else
caf92bc4 3823 goto put;
1da177e4 3824
caf92bc4 3825 write_lock(&idev->lock);
bd11f074
MŻ		 3826 idev->rs_interval = rfc3315_s14_backoff_update(
3827 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
b7b1bfce
HFS		 3828 /* The wait after the last probe can be shorter */
3829 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3830 idev->cnf.rtr_solicits) ?
3831 idev->cnf.rtr_solicit_delay :
bd11f074 3832 idev->rs_interval);
1da177e4 3833 } else {
1da177e4
LT		 3834 /*
3835 * Note: we do not support deprecated "all on-link"
3836 * assumption any longer.
3837 */
91df42be 3838 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3839 }
3840
3841out:
b7b1bfce 3842 write_unlock(&idev->lock);
caf92bc4 3843put:
b7b1bfce 3844 in6_dev_put(idev);
1da177e4
LT		 3845}
3846
3847/*
3848 * Duplicate Address Detection
3849 */
3c21edbd
YH		 3850static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3851{
3852 unsigned long rand_num;
3853 struct inet6_dev *idev = ifp->idev;
adc176c5 3854 u64 nonce;
3c21edbd 3855
95c385b4
NH		 3856 if (ifp->flags & IFA_F_OPTIMISTIC)
3857 rand_num = 0;
3858 else
63862b5b 3859 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3860
adc176c5
EN		 3861 nonce = 0;
3862 if (idev->cnf.enhanced_dad ||
3863 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3864 do
3865 get_random_bytes(&nonce, 6);
3866 while (nonce == 0);
3867 }
3868 ifp->dad_nonce = nonce;
b7b1bfce 3869 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3870 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3871}
3872
c15b1cca 3873static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3874{
3875 struct inet6_dev *idev = ifp->idev;
3876 struct net_device *dev = idev->dev;
764d3be6 3877 bool bump_id, notify = false;
afb1d4b5 3878 struct net *net;
1da177e4
LT		 3879
3880 addrconf_join_solict(dev, &ifp->addr);
3881
63862b5b 3882 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3883
3884 read_lock_bh(&idev->lock);
622ccdf1 3885 spin_lock(&ifp->lock);
e9d3e084 3886 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3887 goto out;
1da177e4 3888
afb1d4b5 3889 net = dev_net(dev);
1da177e4 3890 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
afb1d4b5 3891 (net->ipv6.devconf_all->accept_dad < 1 &&
a2d3f3e3 3892 idev->cnf.accept_dad < 1) ||
55ebaef1
NT		 3893 !(ifp->flags&IFA_F_TENTATIVE) ||
3894 ifp->flags & IFA_F_NODAD) {
c76fe2d9
DA		 3895 bool send_na = false;
3896
3897 if (ifp->flags & IFA_F_TENTATIVE &&
3898 !(ifp->flags & IFA_F_OPTIMISTIC))
3899 send_na = true;
764d3be6 3900 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3901 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3902 spin_unlock(&ifp->lock);
1da177e4
LT		 3903 read_unlock_bh(&idev->lock);
3904
c76fe2d9 3905 addrconf_dad_completed(ifp, bump_id, send_na);
1da177e4
LT		 3906 return;
3907 }
3908
6732bade 3909 if (!(idev->if_flags & IF_READY)) {
21809faf 3910 spin_unlock(&ifp->lock);
6732bade 3911 read_unlock_bh(&idev->lock);
3c21edbd 3912 /*
590a9887 3913 * If the device is not ready:
3c21edbd
YH		 3914 * - keep it tentative if it is a permanent address.
3915 * - otherwise, kill it.
3916 */
3917 in6_ifa_hold(ifp);
cc411d0b 3918 addrconf_dad_stop(ifp, 0);
6732bade 3919 return;
3c21edbd 3920 }
95c385b4
NH		 3921
3922 /*
3923 * Optimistic nodes can start receiving
3924 * Frames right away
3925 */
7fd2561e 3926 if (ifp->flags & IFA_F_OPTIMISTIC) {
afb1d4b5
DA		 3927 ip6_ins_rt(net, ifp->rt);
3928 if (ipv6_use_optimistic_addr(net, idev)) {
7fd2561e
EK		 3929 /* Because optimistic nodes can use this address,
3930 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3931 */
16186a82 3932 notify = true;
7fd2561e
EK		 3933 }
3934 }
95c385b4 3935
6732bade 3936 addrconf_dad_kick(ifp);
1da177e4 3937out:
622ccdf1 3938 spin_unlock(&ifp->lock);
1da177e4 3939 read_unlock_bh(&idev->lock);
16186a82 3940 if (notify)
3941 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 3942}
3943
c15b1cca 3944static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3945{
c15b1cca
HFS		 3946 bool begin_dad = false;
3947
8e8e676d 3948 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3949 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3950 ifp->state = INET6_IFADDR_STATE_PREDAD;
3951 begin_dad = true;
3952 }
8e8e676d 3953 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3954
3955 if (begin_dad)
3956 addrconf_mod_dad_work(ifp, 0);
3957}
3958
3959static void addrconf_dad_work(struct work_struct *w)
3960{
3961 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3962 struct inet6_ifaddr,
3963 dad_work);
1da177e4 3964 struct inet6_dev *idev = ifp->idev;
764d3be6 3965 bool bump_id, disable_ipv6 = false;
1da177e4
LT		 3966 struct in6_addr mcaddr;
3967
c15b1cca
HFS		 3968 enum {
3969 DAD_PROCESS,
3970 DAD_BEGIN,
3971 DAD_ABORT,
3972 } action = DAD_PROCESS;
3973
3974 rtnl_lock();
3975
8e8e676d 3976 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3977 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3978 action = DAD_BEGIN;
3979 ifp->state = INET6_IFADDR_STATE_DAD;
3980 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3981 action = DAD_ABORT;
3982 ifp->state = INET6_IFADDR_STATE_POSTDAD;
85b51b12 3983
35e015e1
MC		 3984 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
3985 idev->cnf.accept_dad > 1) &&
3986 !idev->cnf.disable_ipv6 &&
85b51b12
MM		 3987 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3988 struct in6_addr addr;
3989
3990 addr.s6_addr32[0] = htonl(0xfe800000);
3991 addr.s6_addr32[1] = 0;
3992
3993 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3994 ipv6_addr_equal(&ifp->addr, &addr)) {
3995 /* DAD failed for link-local based on MAC */
3996 idev->cnf.disable_ipv6 = 1;
3997
3998 pr_info("%s: IPv6 being disabled!\n",
3999 ifp->idev->dev->name);
4000 disable_ipv6 = true;
4001 }
4002 }
c15b1cca 4003 }
8e8e676d 4004 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 4005
4006 if (action == DAD_BEGIN) {
4007 addrconf_dad_begin(ifp);
4008 goto out;
4009 } else if (action == DAD_ABORT) {
751eb6b6 4010 in6_ifa_hold(ifp);
c15b1cca 4011 addrconf_dad_stop(ifp, 1);
85b51b12
MM		 4012 if (disable_ipv6)
4013 addrconf_ifdown(idev->dev, 0);
c15b1cca
HFS		 4014 goto out;
4015 }
4016
b7b1bfce 4017 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 4018 goto out;
4019
c15b1cca 4020 write_lock_bh(&idev->lock);
122e4519 4021 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 4022 write_unlock_bh(&idev->lock);
1da177e4
LT		 4023 goto out;
4024 }
21809faf 4025
4026 spin_lock(&ifp->lock);
622ccdf1
HX		 4027 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4028 spin_unlock(&ifp->lock);
c15b1cca 4029 write_unlock_bh(&idev->lock);
622ccdf1
HX		 4030 goto out;
4031 }
4032
b7b1bfce 4033 if (ifp->dad_probes == 0) {
c76fe2d9
DA		 4034 bool send_na = false;
4035
1da177e4
LT		 4036 /*
4037 * DAD was successful
4038 */
4039
c76fe2d9
DA		 4040 if (ifp->flags & IFA_F_TENTATIVE &&
4041 !(ifp->flags & IFA_F_OPTIMISTIC))
4042 send_na = true;
764d3be6 4043 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 4044 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 4045 spin_unlock(&ifp->lock);
c15b1cca 4046 write_unlock_bh(&idev->lock);
1da177e4 4047
c76fe2d9 4048 addrconf_dad_completed(ifp, bump_id, send_na);
1da177e4
LT		 4049
4050 goto out;
4051 }
4052
b7b1bfce 4053 ifp->dad_probes--;
c15b1cca
HFS		 4054 addrconf_mod_dad_work(ifp,
4055 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 4056 spin_unlock(&ifp->lock);
c15b1cca 4057 write_unlock_bh(&idev->lock);
1da177e4
LT		 4058
4059 /* send a neighbour solicitation for our addr */
1da177e4 4060 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
adc176c5
EN		 4061 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4062 ifp->dad_nonce);
1da177e4
LT		 4063out:
4064 in6_ifa_put(ifp);
c15b1cca 4065 rtnl_unlock();
1da177e4
LT		 4066}
4067
11ffff75
HFS		 4068/* ifp->idev must be at least read locked */
4069static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4070{
4071 struct inet6_ifaddr *ifpiter;
4072 struct inet6_dev *idev = ifp->idev;
4073
602582ca
HFS		 4074 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4075 if (ifpiter->scope > IFA_LINK)
4076 break;
11ffff75
HFS		 4077 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4078 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4079 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4080 IFA_F_PERMANENT)
4081 return false;
4082 }
4083 return true;
4084}
4085
c76fe2d9
DA		 4086static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4087 bool send_na)
1da177e4 4088{
e21e8467 4089 struct net_device *dev = ifp->idev->dev;
b7b1bfce 4090 struct in6_addr lladdr;
b173ee48 4091 bool send_rs, send_mld;
b7b1bfce 4092
c15b1cca 4093 addrconf_del_dad_work(ifp);
1da177e4
LT		 4094
4095 /*
4096 * Configure the address for reception. Now it is valid.
4097 */
4098
4099 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4100
026359bc
TA		 4101 /* If added prefix is link local and we are prepared to process
4102 router advertisements, start sending router solicitations.
1da177e4
LT		 4103 */
4104
1ec047eb 4105 read_lock_bh(&ifp->idev->lock);
11ffff75 4106 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 4107 send_rs = send_mld &&
4108 ipv6_accept_ra(ifp->idev) &&
bd11f074 4109 ifp->idev->cnf.rtr_solicits != 0 &&
b173ee48 4110 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 4111 read_unlock_bh(&ifp->idev->lock);
4112
b173ee48
HFS		 4113 /* While dad is in progress mld report's source address is in6_addrany.
4114 * Resend with proper ll now.
4115 */
4116 if (send_mld)
4117 ipv6_mc_dad_complete(ifp->idev);
4118
c76fe2d9
DA		 4119 /* send unsolicited NA if enabled */
4120 if (send_na &&
4121 (ifp->idev->cnf.ndisc_notify ||
4122 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4123 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4124 /*router=*/ !!ifp->idev->cnf.forwarding,
4125 /*solicited=*/ false, /*override=*/ true,
4126 /*inc_opt=*/ true);
4127 }
4128
1ec047eb 4129 if (send_rs) {
1da177e4
LT		 4130 /*
4131 * If a host as already performed a random delay
4132 * [...] as part of DAD [...] there is no need
4133 * to delay again before sending the first RS
4134 */
1ec047eb 4135 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 4136 return;
1ec047eb 4137 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 4138
b7b1bfce
HFS		 4139 write_lock_bh(&ifp->idev->lock);
4140 spin_lock(&ifp->lock);
bd11f074
MŻ		 4141 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4142 ifp->idev->cnf.rtr_solicit_interval);
b7b1bfce 4143 ifp->idev->rs_probes = 1;
1da177e4 4144 ifp->idev->if_flags |= IF_RS_SENT;
bd11f074 4145 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
b7b1bfce
HFS		 4146 spin_unlock(&ifp->lock);
4147 write_unlock_bh(&ifp->idev->lock);
1da177e4 4148 }
764d3be6
PA		 4149
4150 if (bump_id)
4151 rt_genid_bump_ipv6(dev_net(dev));
a11a7f71
MH		 4152
4153 /* Make sure that a new temporary address will be created
4154 * before this temporary address becomes deprecated.
4155 */
4156 if (ifp->flags & IFA_F_TEMPORARY)
4157 addrconf_verify_rtnl();
1da177e4
LT		 4158}
4159
e21e8467
SH		 4160static void addrconf_dad_run(struct inet6_dev *idev)
4161{
c5e33bdd
YH		 4162 struct inet6_ifaddr *ifp;
4163
4164 read_lock_bh(&idev->lock);
502a2ffd 4165 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 4166 spin_lock(&ifp->lock);
f2344a13
HX		 4167 if (ifp->flags & IFA_F_TENTATIVE &&
4168 ifp->state == INET6_IFADDR_STATE_DAD)
4169 addrconf_dad_kick(ifp);
21809faf 4170 spin_unlock(&ifp->lock);
c5e33bdd
YH		 4171 }
4172 read_unlock_bh(&idev->lock);
4173}
4174
1da177e4
LT		 4175#ifdef CONFIG_PROC_FS
4176struct if6_iter_state {
3c40090a 4177 struct seq_net_private p;
1da177e4 4178 int bucket;
1d578303 4179 int offset;
1da177e4
LT		 4180};
4181
1d578303 4182static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4 4183{
1da177e4 4184 struct if6_iter_state *state = seq->private;
1218854a 4185 struct net *net = seq_file_net(seq);
a5c1d98f 4186 struct inet6_ifaddr *ifa = NULL;
1d578303 4187 int p = 0;
1da177e4 4188
1d578303
MM		 4189 /* initial bucket if pos is 0 */
4190 if (pos == 0) {
4191 state->bucket = 0;
4192 state->offset = 0;
4193 }
4194
4195 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
a5c1d98f 4196 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
1d578303 4197 addr_lst) {
9f0d3c27
ED		 4198 if (!net_eq(dev_net(ifa->idev->dev), net))
4199 continue;
1d578303
MM		 4200 /* sync with offset */
4201 if (p < state->offset) {
4202 p++;
4203 continue;
4204 }
4205 state->offset++;
9f0d3c27 4206 return ifa;
1d578303
MM		 4207 }
4208
4209 /* prepare for next bucket */
4210 state->offset = 0;
4211 p = 0;
1da177e4 4212 }
c2e21293 4213 return NULL;
1da177e4
LT		 4214}
4215
c2e21293 4216static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4217 struct inet6_ifaddr *ifa)
1da177e4
LT		 4218{
4219 struct if6_iter_state *state = seq->private;
1218854a 4220 struct net *net = seq_file_net(seq);
1da177e4 4221
a5c1d98f 4222 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
9f0d3c27
ED		 4223 if (!net_eq(dev_net(ifa->idev->dev), net))
4224 continue;
1d578303 4225 state->offset++;
9f0d3c27 4226 return ifa;
1d578303 4227 }
3c40090a 4228
c2e21293 4229 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 4230 state->offset = 0;
a5c1d98f 4231 hlist_for_each_entry_rcu(ifa,
c2e21293 4232 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 4233 if (!net_eq(dev_net(ifa->idev->dev), net))
4234 continue;
1d578303 4235 state->offset++;
9f0d3c27 4236 return ifa;
c2e21293 4237 }
1da177e4 4238 }
3c40090a 4239
c2e21293 4240 return NULL;
1da177e4
LT		 4241}
4242
1da177e4 4243static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
a5c1d98f 4244 __acquires(rcu)
1da177e4 4245{
a5c1d98f 4246 rcu_read_lock();
1d578303 4247 return if6_get_first(seq, *pos);
1da177e4
LT		 4248}
4249
4250static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4251{
4252 struct inet6_ifaddr *ifa;
4253
4254 ifa = if6_get_next(seq, v);
4255 ++*pos;
4256 return ifa;
4257}
4258
4259static void if6_seq_stop(struct seq_file *seq, void *v)
a5c1d98f 4260 __releases(rcu)
1da177e4 4261{
a5c1d98f 4262 rcu_read_unlock();
1da177e4
LT		 4263}
4264
4265static int if6_seq_show(struct seq_file *seq, void *v)
4266{
4267 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4268 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4269 &ifp->addr,
1da177e4
LT		 4270 ifp->idev->dev->ifindex,
4271 ifp->prefix_len,
4272 ifp->scope,
971a351c 4273 (u8) ifp->flags,
1da177e4
LT		 4274 ifp->idev->dev->name);
4275 return 0;
4276}
4277
56b3d975 4278static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4279 .start = if6_seq_start,
4280 .next = if6_seq_next,
4281 .show = if6_seq_show,
4282 .stop = if6_seq_stop,
4283};
4284
2c8c1e72 4285static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4286{
c3506372
CH		 4287 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4288 sizeof(struct if6_iter_state)))
1da177e4
LT		 4289 return -ENOMEM;
4290 return 0;
4291}
4292
2c8c1e72 4293static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4294{
ece31ffd 4295 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4296}
4297
4298static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4299 .init = if6_proc_net_init,
4300 .exit = if6_proc_net_exit,
3c40090a
DL		 4301};
4302
4303int __init if6_proc_init(void)
4304{
4305 return register_pernet_subsys(&if6_proc_net_ops);
4306}
4307
1da177e4
LT		 4308void if6_proc_exit(void)
4309{
3c40090a 4310 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4311}
4312#endif /* CONFIG_PROC_FS */
4313
07a93626 4314#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4315/* Check if address is a home address configured on any interface. */
b71d1d42 4316int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c 4317{
3f27fb23 4318 unsigned int hash = inet6_addr_hash(net, addr);
c2e21293 4319 struct inet6_ifaddr *ifp = NULL;
3f27fb23 4320 int ret = 0;
c2e21293 4321
4e5f47ab
ED		 4322 rcu_read_lock();
4323 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 4324 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 4325 continue;
caad295f 4326 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4327 (ifp->flags & IFA_F_HOMEADDRESS)) {
4328 ret = 1;
4329 break;
4330 }
4331 }
4e5f47ab 4332 rcu_read_unlock();
3b9f9a1c
NT		 4333 return ret;
4334}
4335#endif
4336
1da177e4
LT		 4337/*
4338 * Periodic address status verification
4339 */
4340
c15b1cca 4341static void addrconf_verify_rtnl(void)
1da177e4 4342{
b2db7564 4343 unsigned long now, next, next_sec, next_sched;
1da177e4 4344 struct inet6_ifaddr *ifp;
1da177e4
LT		 4345 int i;
4346
c15b1cca
HFS		 4347 ASSERT_RTNL();
4348
5c578aed 4349 rcu_read_lock_bh();
1da177e4 4350 now = jiffies;
b2db7564 4351 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4352
c15b1cca 4353 cancel_delayed_work(&addr_chk_work);
1da177e4 4354
bcdd553f 4355 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4356restart:
c15b1cca 4357 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 4358 unsigned long age;
1da177e4 4359
fad8da3e
YA		 4360 /* When setting preferred_lft to a value not zero or
4361 * infinity, while valid_lft is infinity
4362 * IFA_F_PERMANENT has a non-infinity life time.
4363 */
4364 if ((ifp->flags & IFA_F_PERMANENT) &&
4365 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4366 continue;
4367
4368 spin_lock(&ifp->lock);
b2db7564
YH		 4369 /* We try to batch several events at once. */
4370 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4371
8f27ebb9
YH		 4372 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4373 age >= ifp->valid_lft) {
1da177e4
LT		 4374 spin_unlock(&ifp->lock);
4375 in6_ifa_hold(ifp);
1da177e4
LT		 4376 ipv6_del_addr(ifp);
4377 goto restart;
8f27ebb9
YH		 4378 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4379 spin_unlock(&ifp->lock);
4380 continue;
1da177e4 4381 } else if (age >= ifp->prefered_lft) {
a1ed0526 4382 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4383 int deprecate = 0;
4384
4385 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4386 deprecate = 1;
4387 ifp->flags |= IFA_F_DEPRECATED;
4388 }
4389
fad8da3e
YA		 4390 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4391 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4392 next = ifp->tstamp + ifp->valid_lft * HZ;
4393
4394 spin_unlock(&ifp->lock);
4395
4396 if (deprecate) {
4397 in6_ifa_hold(ifp);
1da177e4
LT		 4398
4399 ipv6_ifa_notify(0, ifp);
4400 in6_ifa_put(ifp);
4401 goto restart;
4402 }
1da177e4
LT		 4403 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4404 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4405 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4406 ifp->idev->cnf.dad_transmits *
1f9248e5 4407 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 4408
1da177e4
LT		 4409 if (age >= ifp->prefered_lft - regen_advance) {
4410 struct inet6_ifaddr *ifpub = ifp->ifpub;
4411 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4412 next = ifp->tstamp + ifp->prefered_lft * HZ;
4413 if (!ifp->regen_count && ifpub) {
4414 ifp->regen_count++;
4415 in6_ifa_hold(ifp);
4416 in6_ifa_hold(ifpub);
4417 spin_unlock(&ifp->lock);
5c578aed 4418
291d809b
HY		 4419 spin_lock(&ifpub->lock);
4420 ifpub->regen_count = 0;
4421 spin_unlock(&ifpub->lock);
e64e469b 4422 rcu_read_unlock_bh();
fffcefe9 4423 ipv6_create_tempaddr(ifpub, ifp, true);
1da177e4
LT		 4424 in6_ifa_put(ifpub);
4425 in6_ifa_put(ifp);
e64e469b 4426 rcu_read_lock_bh();
1da177e4
LT		 4427 goto restart;
4428 }
4429 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4430 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4431 spin_unlock(&ifp->lock);
1da177e4
LT		 4432 } else {
4433 /* ifp->prefered_lft <= ifp->valid_lft */
4434 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4435 next = ifp->tstamp + ifp->prefered_lft * HZ;
4436 spin_unlock(&ifp->lock);
4437 }
4438 }
1da177e4
LT		 4439 }
4440
b2db7564
YH		 4441 next_sec = round_jiffies_up(next);
4442 next_sched = next;
4443
4444 /* If rounded timeout is accurate enough, accept it. */
4445 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4446 next_sched = next_sec;
4447
4448 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4449 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4450 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4451
e32ac250
JP		 4452 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4453 now, next, next_sec, next_sched);
c15b1cca 4454 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4455 rcu_read_unlock_bh();
1da177e4
LT		 4456}
4457
c15b1cca
HFS		 4458static void addrconf_verify_work(struct work_struct *w)
4459{
4460 rtnl_lock();
4461 addrconf_verify_rtnl();
4462 rtnl_unlock();
4463}
4464
4465static void addrconf_verify(void)
4466{
4467 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4468}
4469
caeaba79
ND		 4470static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4471 struct in6_addr **peer_pfx)
461d8837
TG		 4472{
4473 struct in6_addr *pfx = NULL;
4474
caeaba79
ND		 4475 *peer_pfx = NULL;
4476
461d8837
TG		 4477 if (addr)
4478 pfx = nla_data(addr);
4479
4480 if (local) {
4481 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4482 *peer_pfx = pfx;
4483 pfx = nla_data(local);
461d8837
TG		 4484 }
4485
4486 return pfx;
4487}
4488
ef7c79ed 4489static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4490 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4491 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4492 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4493 [IFA_FLAGS] = { .len = sizeof(u32) },
8308f3ff 4494 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
461d8837
TG		 4495};
4496
1da177e4 4497static int
c21ef3e3
DA		 4498inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4499 struct netlink_ext_ack *extack)
1da177e4 4500{
3b1e0a65 4501 struct net *net = sock_net(skb->sk);
b933f716
TG		 4502 struct ifaddrmsg *ifm;
4503 struct nlattr *tb[IFA_MAX+1];
caeaba79 4504 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4505 u32 ifa_flags;
b933f716 4506 int err;
1da177e4 4507
fceb6435 4508 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4509 extack);
b933f716
TG		 4510 if (err < 0)
4511 return err;
4512
4513 ifm = nlmsg_data(nlh);
caeaba79 4514 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4515 if (!pfx)
1da177e4
LT		 4516 return -EINVAL;
4517
6046d5b4
HK		 4518 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4519
4520 /* We ignore other flags so far. */
4521 ifa_flags &= IFA_F_MANAGETEMPADDR;
4522
4523 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4524 ifm->ifa_prefixlen);
1da177e4
LT		 4525}
4526
8308f3ff
DA		 4527static int modify_prefix_route(struct inet6_ifaddr *ifp,
4528 unsigned long expires, u32 flags)
4529{
4530 struct fib6_info *f6i;
e7c7faa9 4531 u32 prio;
8308f3ff
DA		 4532
4533 f6i = addrconf_get_prefix_route(&ifp->addr,
4534 ifp->prefix_len,
4535 ifp->idev->dev,
4536 0, RTF_GATEWAY | RTF_DEFAULT);
4537 if (!f6i)
4538 return -ENOENT;
4539
e7c7faa9
DA		 4540 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4541 if (f6i->fib6_metric != prio) {
4542 /* delete old one */
4543 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
4544
8308f3ff
DA		 4545 /* add new one */
4546 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4547 ifp->rt_priority, ifp->idev->dev,
4548 expires, flags, GFP_KERNEL);
8308f3ff
DA		 4549 } else {
4550 if (!expires)
4551 fib6_clean_expires(f6i);
4552 else
4553 fib6_set_expires(f6i, expires);
4554
4555 fib6_info_release(f6i);
4556 }
4557
4558 return 0;
4559}
4560
d169a1f8 4561static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
081bba5b 4562{
6f704992
YH		 4563 u32 flags;
4564 clock_t expires;
4bed72e4 4565 unsigned long timeout;
53bd6749 4566 bool was_managetempaddr;
5b84efec 4567 bool had_prefixroute;
46d48046 4568
c15b1cca
HFS		 4569 ASSERT_RTNL();
4570
d169a1f8 4571 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
081bba5b
NT		 4572 return -EINVAL;
4573
d169a1f8 4574 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
53bd6749
JP		 4575 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4576 return -EINVAL;
4577
f1c02cfb 4578 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
d169a1f8 4579 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
f1c02cfb 4580
d169a1f8 4581 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4bed72e4
YH		 4582 if (addrconf_finite_timeout(timeout)) {
4583 expires = jiffies_to_clock_t(timeout * HZ);
d169a1f8 4584 cfg->valid_lft = timeout;
6f704992 4585 flags = RTF_EXPIRES;
4bed72e4
YH		 4586 } else {
4587 expires = 0;
4588 flags = 0;
d169a1f8 4589 cfg->ifa_flags |= IFA_F_PERMANENT;
6f704992 4590 }
081bba5b 4591
d169a1f8 4592 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4bed72e4
YH		 4593 if (addrconf_finite_timeout(timeout)) {
4594 if (timeout == 0)
d169a1f8
DA		 4595 cfg->ifa_flags |= IFA_F_DEPRECATED;
4596 cfg->preferred_lft = timeout;
4bed72e4 4597 }
081bba5b
NT		 4598
4599 spin_lock_bh(&ifp->lock);
53bd6749 4600 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4601 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4602 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4603 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4604 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4605 IFA_F_NOPREFIXROUTE);
d169a1f8 4606 ifp->flags |= cfg->ifa_flags;
081bba5b 4607 ifp->tstamp = jiffies;
d169a1f8
DA		 4608 ifp->valid_lft = cfg->valid_lft;
4609 ifp->prefered_lft = cfg->preferred_lft;
081bba5b 4610
8308f3ff
DA		 4611 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4612 ifp->rt_priority = cfg->rt_priority;
081bba5b
NT		 4613
4614 spin_unlock_bh(&ifp->lock);
4615 if (!(ifp->flags&IFA_F_TENTATIVE))
4616 ipv6_ifa_notify(0, ifp);
081bba5b 4617
d169a1f8 4618 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
8308f3ff
DA		 4619 int rc = -ENOENT;
4620
4621 if (had_prefixroute)
4622 rc = modify_prefix_route(ifp, expires, flags);
4623
4624 /* prefix route could have been deleted; if so restore it */
4625 if (rc == -ENOENT) {
4626 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4627 ifp->rt_priority, ifp->idev->dev,
4628 expires, flags, GFP_KERNEL);
4629 }
5b84efec
TH		 4630 } else if (had_prefixroute) {
4631 enum cleanup_prefix_rt_t action;
4632 unsigned long rt_expires;
4633
4634 write_lock_bh(&ifp->idev->lock);
4635 action = check_cleanup_prefix_route(ifp, &rt_expires);
4636 write_unlock_bh(&ifp->idev->lock);
4637
4638 if (action != CLEANUP_PREFIX_RT_NOP) {
4639 cleanup_prefix_route(ifp, rt_expires,
4640 action == CLEANUP_PREFIX_RT_DEL);
4641 }
761aac73 4642 }
53bd6749
JP		 4643
4644 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
d169a1f8
DA		 4645 if (was_managetempaddr &&
4646 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4647 cfg->valid_lft = 0;
4648 cfg->preferred_lft = 0;
4649 }
4650 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4651 cfg->preferred_lft, !was_managetempaddr,
4652 jiffies);
53bd6749
JP		 4653 }
4654
c15b1cca 4655 addrconf_verify_rtnl();
081bba5b
NT		 4656
4657 return 0;
4658}
4659
1da177e4 4660static int
c21ef3e3
DA		 4661inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4662 struct netlink_ext_ack *extack)
1da177e4 4663{
3b1e0a65 4664 struct net *net = sock_net(skb->sk);
461d8837
TG		 4665 struct ifaddrmsg *ifm;
4666 struct nlattr *tb[IFA_MAX+1];
19b1518c 4667 struct in6_addr *peer_pfx;
7198f8ce
TG		 4668 struct inet6_ifaddr *ifa;
4669 struct net_device *dev;
f1c02cfb 4670 struct inet6_dev *idev;
19b1518c 4671 struct ifa6_config cfg;
461d8837 4672 int err;
1da177e4 4673
fceb6435 4674 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4675 extack);
461d8837
TG		 4676 if (err < 0)
4677 return err;
4678
19b1518c
DA		 4679 memset(&cfg, 0, sizeof(cfg));
4680
461d8837 4681 ifm = nlmsg_data(nlh);
19b1518c
DA		 4682 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4683 if (!cfg.pfx)
1da177e4
LT		 4684 return -EINVAL;
4685
19b1518c
DA		 4686 cfg.peer_pfx = peer_pfx;
4687 cfg.plen = ifm->ifa_prefixlen;
8308f3ff
DA		 4688 if (tb[IFA_RT_PRIORITY])
4689 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4690
19b1518c
DA		 4691 cfg.valid_lft = INFINITY_LIFE_TIME;
4692 cfg.preferred_lft = INFINITY_LIFE_TIME;
4693
461d8837 4694 if (tb[IFA_CACHEINFO]) {
0778769d 4695 struct ifa_cacheinfo *ci;
461d8837
TG		 4696
4697 ci = nla_data(tb[IFA_CACHEINFO]);
19b1518c
DA		 4698 cfg.valid_lft = ci->ifa_valid;
4699 cfg.preferred_lft = ci->ifa_prefered;
0778769d
NT		 4700 }
4701
af284937 4702 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4703 if (!dev)
7198f8ce
TG		 4704 return -ENODEV;
4705
19b1518c
DA		 4706 if (tb[IFA_FLAGS])
4707 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4708 else
4709 cfg.ifa_flags = ifm->ifa_flags;
479840ff 4710
55ebaef1 4711 /* We ignore other flags so far. */
19b1518c
DA		 4712 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4713 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4714 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
f1c02cfb
SD		 4715
4716 idev = ipv6_find_idev(dev);
4717 if (IS_ERR(idev))
4718 return PTR_ERR(idev);
4719
4720 if (!ipv6_allow_optimistic_dad(net, idev))
19b1518c 4721 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
f1c02cfb 4722
19b1518c
DA		 4723 if (cfg.ifa_flags & IFA_F_NODAD &&
4724 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
f1c02cfb
SD		 4725 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4726 return -EINVAL;
4727 }
55ebaef1 4728
19b1518c 4729 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
63159f29 4730 if (!ifa) {
7198f8ce
TG		 4731 /*
4732 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4733 * userspace already relies on not having to provide this.
7198f8ce 4734 */
19b1518c 4735 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
081bba5b
NT		 4736 }
4737
7198f8ce
TG		 4738 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4739 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4740 err = -EEXIST;
4741 else
d169a1f8 4742 err = inet6_addr_modify(ifa, &cfg);
7198f8ce
TG		 4743
4744 in6_ifa_put(ifa);
4745
4746 return err;
1da177e4
LT		 4747}
4748
479840ff 4749static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4750 u8 scope, int ifindex)
4751{
4752 struct ifaddrmsg *ifm;
4753
4754 ifm = nlmsg_data(nlh);
4755 ifm->ifa_family = AF_INET6;
4756 ifm->ifa_prefixlen = prefixlen;
4757 ifm->ifa_flags = flags;
4758 ifm->ifa_scope = scope;
4759 ifm->ifa_index = ifindex;
4760}
4761
85486af0
TG		 4762static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4763 unsigned long tstamp, u32 preferred, u32 valid)
4764{
4765 struct ifa_cacheinfo ci;
4766
18a31e1e
TG		 4767 ci.cstamp = cstamp_delta(cstamp);
4768 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4769 ci.ifa_prefered = preferred;
4770 ci.ifa_valid = valid;
4771
4772 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4773}
4774
101bb229
TG		 4775static inline int rt_scope(int ifa_scope)
4776{
4777 if (ifa_scope & IFA_HOST)
4778 return RT_SCOPE_HOST;
4779 else if (ifa_scope & IFA_LINK)
4780 return RT_SCOPE_LINK;
4781 else if (ifa_scope & IFA_SITE)
4782 return RT_SCOPE_SITE;
4783 else
4784 return RT_SCOPE_UNIVERSE;
4785}
4786
0ab6803b
TG		 4787static inline int inet6_ifaddr_msgsize(void)
4788{
339bf98f 4789 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4790 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4791 + nla_total_size(16) /* IFA_ADDRESS */
479840ff 4792 + nla_total_size(sizeof(struct ifa_cacheinfo))
8308f3ff
DA		 4793 + nla_total_size(4) /* IFA_FLAGS */
4794 + nla_total_size(4) /* IFA_RT_PRIORITY */;
0ab6803b 4795}
c5396a31 4796
1da177e4 4797static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4798 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4799{
1da177e4 4800 struct nlmsghdr *nlh;
85486af0 4801 u32 preferred, valid;
1da177e4 4802
15e47304 4803 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4804 if (!nlh)
26932566 4805 return -EMSGSIZE;
0ab6803b 4806
101bb229
TG		 4807 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4808 ifa->idev->dev->ifindex);
4809
fad8da3e
YA		 4810 if (!((ifa->flags&IFA_F_PERMANENT) &&
4811 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4812 preferred = ifa->prefered_lft;
4813 valid = ifa->valid_lft;
4814 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4815 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4816 if (preferred > tval)
4817 preferred -= tval;
4818 else
4819 preferred = 0;
f56619fc
BH		 4820 if (valid != INFINITY_LIFE_TIME) {
4821 if (valid > tval)
4822 valid -= tval;
4823 else
4824 valid = 0;
4825 }
1da177e4
LT		 4826 }
4827 } else {
85486af0
TG		 4828 preferred = INFINITY_LIFE_TIME;
4829 valid = INFINITY_LIFE_TIME;
4830 }
4831
7996c799 4832 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4833 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4834 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4835 goto error;
4836 } else
930345ea 4837 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4838 goto error;
4839
8308f3ff
DA		 4840 if (ifa->rt_priority &&
4841 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
4842 goto error;
4843
caeaba79
ND		 4844 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4845 goto error;
1da177e4 4846
479840ff
JP		 4847 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4848 goto error;
4849
053c095a
JB		 4850 nlmsg_end(skb, nlh);
4851 return 0;
caeaba79
ND		 4852
4853error:
4854 nlmsg_cancel(skb, nlh);
4855 return -EMSGSIZE;
1da177e4
LT		 4856}
4857
4858static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4859 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4860{
1da177e4 4861 struct nlmsghdr *nlh;
101bb229
TG		 4862 u8 scope = RT_SCOPE_UNIVERSE;
4863 int ifindex = ifmca->idev->dev->ifindex;
4864
4865 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4866 scope = RT_SCOPE_SITE;
1da177e4 4867
15e47304 4868 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4869 if (!nlh)
26932566 4870 return -EMSGSIZE;
85486af0 4871
0ab6803b 4872 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4873 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4874 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4875 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4876 nlmsg_cancel(skb, nlh);
4877 return -EMSGSIZE;
4878 }
85486af0 4879
053c095a
JB		 4880 nlmsg_end(skb, nlh);
4881 return 0;
1da177e4
LT		 4882}
4883
4884static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4885 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4886{
9ee8cbb2
DA		 4887 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
4888 int ifindex = dev ? dev->ifindex : 1;
1da177e4 4889 struct nlmsghdr *nlh;
101bb229 4890 u8 scope = RT_SCOPE_UNIVERSE;
101bb229
TG		 4891
4892 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4893 scope = RT_SCOPE_SITE;
1da177e4 4894
15e47304 4895 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4896 if (!nlh)
26932566 4897 return -EMSGSIZE;
85486af0 4898
0ab6803b 4899 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4900 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4901 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4902 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4903 nlmsg_cancel(skb, nlh);
4904 return -EMSGSIZE;
4905 }
1da177e4 4906
053c095a
JB		 4907 nlmsg_end(skb, nlh);
4908 return 0;
1da177e4
LT		 4909}
4910
e21e8467 4911enum addr_type_t {
1da177e4
LT		 4912 UNICAST_ADDR,
4913 MULTICAST_ADDR,
4914 ANYCAST_ADDR,
4915};
4916
234b27c3
ED		 4917/* called with rcu_read_lock() */
4918static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4919 struct netlink_callback *cb, enum addr_type_t type,
4920 int s_ip_idx, int *p_ip_idx)
4921{
234b27c3
ED		 4922 struct ifmcaddr6 *ifmca;
4923 struct ifacaddr6 *ifaca;
4924 int err = 1;
4925 int ip_idx = *p_ip_idx;
4926
4927 read_lock_bh(&idev->lock);
4928 switch (type) {
502a2ffd 4929 case UNICAST_ADDR: {
4930 struct inet6_ifaddr *ifa;
4931
234b27c3 4932 /* unicast address incl. temp addr */
502a2ffd 4933 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4934 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4935 continue;
4936 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4937 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4938 cb->nlh->nlmsg_seq,
4939 RTM_NEWADDR,
4940 NLM_F_MULTI);
053c095a 4941 if (err < 0)
234b27c3 4942 break;
63998ac2 4943 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4944 }
4945 break;
502a2ffd 4946 }
234b27c3
ED		 4947 case MULTICAST_ADDR:
4948 /* multicast address */
4949 for (ifmca = idev->mc_list; ifmca;
4950 ifmca = ifmca->next, ip_idx++) {
4951 if (ip_idx < s_ip_idx)
4952 continue;
4953 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4954 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4955 cb->nlh->nlmsg_seq,
4956 RTM_GETMULTICAST,
4957 NLM_F_MULTI);
053c095a 4958 if (err < 0)
234b27c3
ED		 4959 break;
4960 }
4961 break;
4962 case ANYCAST_ADDR:
4963 /* anycast address */
4964 for (ifaca = idev->ac_list; ifaca;
4965 ifaca = ifaca->aca_next, ip_idx++) {
4966 if (ip_idx < s_ip_idx)
4967 continue;
4968 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4969 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4970 cb->nlh->nlmsg_seq,
4971 RTM_GETANYCAST,
4972 NLM_F_MULTI);
053c095a 4973 if (err < 0)
234b27c3
ED		 4974 break;
4975 }
4976 break;
4977 default:
4978 break;
4979 }
4980 read_unlock_bh(&idev->lock);
4981 *p_ip_idx = ip_idx;
4982 return err;
4983}
4984
1da177e4
LT		 4985static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4986 enum addr_type_t type)
4987{
234b27c3
ED		 4988 struct net *net = sock_net(skb->sk);
4989 int h, s_h;
1da177e4
LT		 4990 int idx, ip_idx;
4991 int s_idx, s_ip_idx;
1da177e4 4992 struct net_device *dev;
234b27c3
ED		 4993 struct inet6_dev *idev;
4994 struct hlist_head *head;
1ab1457c 4995
234b27c3
ED		 4996 s_h = cb->args[0];
4997 s_idx = idx = cb->args[1];
4998 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4999
234b27c3 5000 rcu_read_lock();
63998ac2 5001 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 5002 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5003 idx = 0;
5004 head = &net->dev_index_head[h];
b67bfe0d 5005 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 5006 if (idx < s_idx)
5007 goto cont;
4b97efdf 5008 if (h > s_h || idx > s_idx)
234b27c3
ED		 5009 s_ip_idx = 0;
5010 ip_idx = 0;
e21e8467
SH		 5011 idev = __in6_dev_get(dev);
5012 if (!idev)
234b27c3
ED		 5013 goto cont;
5014
5015 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 5016 s_ip_idx, &ip_idx) < 0)
234b27c3 5017 goto done;
7562f876 5018cont:
234b27c3
ED		 5019 idx++;
5020 }
1da177e4 5021 }
234b27c3
ED		 5022done:
5023 rcu_read_unlock();
5024 cb->args[0] = h;
5025 cb->args[1] = idx;
5026 cb->args[2] = ip_idx;
5027
1da177e4
LT		 5028 return skb->len;
5029}
5030
5031static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5032{
5033 enum addr_type_t type = UNICAST_ADDR;
b854272b 5034
1da177e4
LT		 5035 return inet6_dump_addr(skb, cb, type);
5036}
5037
5038static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5039{
5040 enum addr_type_t type = MULTICAST_ADDR;
b854272b 5041
1da177e4
LT		 5042 return inet6_dump_addr(skb, cb, type);
5043}
5044
5045
5046static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5047{
5048 enum addr_type_t type = ANYCAST_ADDR;
b854272b 5049
1da177e4
LT		 5050 return inet6_dump_addr(skb, cb, type);
5051}
5052
c21ef3e3
DA		 5053static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5054 struct netlink_ext_ack *extack)
6c223828 5055{
3b1e0a65 5056 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 5057 struct ifaddrmsg *ifm;
5058 struct nlattr *tb[IFA_MAX+1];
caeaba79 5059 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 5060 struct net_device *dev = NULL;
5061 struct inet6_ifaddr *ifa;
5062 struct sk_buff *skb;
6c223828
NT		 5063 int err;
5064
fceb6435 5065 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 5066 extack);
1b29fc2c 5067 if (err < 0)
c24675f8 5068 return err;
1b29fc2c 5069
caeaba79 5070 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
c24675f8
FW		 5071 if (!addr)
5072 return -EINVAL;
6c223828 5073
1b29fc2c 5074 ifm = nlmsg_data(nlh);
6c223828 5075 if (ifm->ifa_index)
c24675f8 5076 dev = dev_get_by_index(net, ifm->ifa_index);
6c223828 5077
e21e8467
SH		 5078 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
5079 if (!ifa) {
1b29fc2c
TG		 5080 err = -EADDRNOTAVAIL;
5081 goto errout;
5082 }
6c223828 5083
e21e8467
SH		 5084 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5085 if (!skb) {
6c223828 5086 err = -ENOBUFS;
1b29fc2c 5087 goto errout_ifa;
6c223828
NT		 5088 }
5089
15e47304 5090 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 5091 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 5092 if (err < 0) {
5093 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5094 WARN_ON(err == -EMSGSIZE);
5095 kfree_skb(skb);
5096 goto errout_ifa;
5097 }
15e47304 5098 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 5099errout_ifa:
6c223828 5100 in6_ifa_put(ifa);
1b29fc2c 5101errout:
c24675f8
FW		 5102 if (dev)
5103 dev_put(dev);
6c223828 5104 return err;
6c223828
NT		 5105}
5106
1da177e4
LT		 5107static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5108{
5109 struct sk_buff *skb;
c346dca1 5110 struct net *net = dev_net(ifa->idev->dev);
5d620266 5111 int err = -ENOBUFS;
1da177e4 5112
0ab6803b 5113 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 5114 if (!skb)
5d620266
TG		 5115 goto errout;
5116
5117 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 5118 if (err < 0) {
5119 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5120 WARN_ON(err == -EMSGSIZE);
5121 kfree_skb(skb);
5122 goto errout;
5123 }
1ce85fe4
PNA		 5124 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5125 return;
5d620266
TG		 5126errout:
5127 if (err < 0)
6fda7350 5128 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 5129}
5130
b6f99a21 5131static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 5132 __s32 *array, int bytes)
5133{
04561c1f
TG		 5134 BUG_ON(bytes < (DEVCONF_MAX * 4));
5135
1da177e4
LT		 5136 memset(array, 0, bytes);
5137 array[DEVCONF_FORWARDING] = cnf->forwarding;
5138 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5139 array[DEVCONF_MTU6] = cnf->mtu6;
5140 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5141 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5142 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5143 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5144 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 5145 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5146 jiffies_to_msecs(cnf->rtr_solicit_interval);
bd11f074
MŻ		 5147 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5148 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
93908d19
TG		 5149 array[DEVCONF_RTR_SOLICIT_DELAY] =
5150 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 5151 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 5152 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5153 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5154 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5155 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 5156 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5157 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5158 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5159 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5160 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 5161 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 5162 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 5163 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 5164 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 5165#ifdef CONFIG_IPV6_ROUTER_PREF
5166 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 5167 array[DEVCONF_RTR_PROBE_INTERVAL] =
5168 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 5169#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 5170 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
09c884d4
YH		 5171 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5172#endif
930d6ff2 5173#endif
fbea49e1 5174 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 5175 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 5176#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5177 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 5178 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 5179#endif
7bc570c8
YH		 5180#ifdef CONFIG_IPV6_MROUTE
5181 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5182#endif
778d80be 5183 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 5184 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 5185 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 5186 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 5187 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 5188 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 5189 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 5190 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 5191 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 5192 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 5193 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 5194 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 5195 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1ababeba 5196 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
bf355b8d
DL		 5197#ifdef CONFIG_IPV6_SEG6_HMAC
5198 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5199#endif
adc176c5 5200 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
d35a00b8 5201 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
df789fe7 5202 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
2210d6b2 5203 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
1da177e4
LT		 5204}
5205
b382b191
TG		 5206static inline size_t inet6_ifla6_size(void)
5207{
5208 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5209 + nla_total_size(sizeof(struct ifla_cacheinfo))
5210 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5211 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 5212 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5213 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 5214}
5215
339bf98f
TG		 5216static inline size_t inet6_if_nlmsg_size(void)
5217{
5218 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5219 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5220 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5221 + nla_total_size(4) /* IFLA_MTU */
5222 + nla_total_size(4) /* IFLA_LINK */
0344338b 5223 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 5224 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 5225}
c5396a31 5226
be281e55 5227static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
aca05671 5228 int bytes)
7f7d9a6b
HX		 5229{
5230 int i;
aca05671 5231 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
7f7d9a6b
HX		 5232 BUG_ON(pad < 0);
5233
5234 /* Use put_unaligned() because stats may not be aligned for u64. */
aca05671
JH		 5235 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5236 for (i = 1; i < ICMP6_MIB_MAX; i++)
be281e55 5237 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b 5238
aca05671 5239 memset(&stats[ICMP6_MIB_MAX], 0, pad);
7f7d9a6b
HX		 5240}
5241
698365fa 5242static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 5243 int bytes, size_t syncpoff)
4ce3c183 5244{
a3a77372
R		 5245 int i, c;
5246 u64 buff[IPSTATS_MIB_MAX];
5247 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5248
4ce3c183
ED		 5249 BUG_ON(pad < 0);
5250
a3a77372
R		 5251 memset(buff, 0, sizeof(buff));
5252 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 5253
a3a77372
R		 5254 for_each_possible_cpu(c) {
5255 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5256 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5257 }
5258
5259 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5260 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 5261}
5262
7f7d9a6b
HX		 5263static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5264 int bytes)
5265{
e21e8467 5266 switch (attrtype) {
7f7d9a6b 5267 case IFLA_INET6_STATS:
a3a77372
R		 5268 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5269 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 5270 break;
5271 case IFLA_INET6_ICMP6STATS:
aca05671 5272 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
7f7d9a6b
HX		 5273 break;
5274 }
5275}
5276
d5566fd7
SV		 5277static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5278 u32 ext_filter_mask)
b382b191
TG		 5279{
5280 struct nlattr *nla;
5281 struct ifla_cacheinfo ci;
5282
c78679e8
DM		 5283 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5284 goto nla_put_failure;
b382b191 5285 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 5286 ci.tstamp = cstamp_delta(idev->tstamp);
5287 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 5288 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 5289 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5290 goto nla_put_failure;
b382b191 5291 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 5292 if (!nla)
b382b191
TG		 5293 goto nla_put_failure;
5294 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5295
5296 /* XXX - MC not implemented */
5297
d5566fd7
SV		 5298 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5299 return 0;
5300
b382b191 5301 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 5302 if (!nla)
b382b191
TG		 5303 goto nla_put_failure;
5304 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5305
5306 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 5307 if (!nla)
b382b191
TG		 5308 goto nla_put_failure;
5309 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5310
f53adae4 5311 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 5312 if (!nla)
f53adae4 5313 goto nla_put_failure;
bc91b0f0 5314
d35a00b8 5315 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
bc91b0f0
JP		 5316 goto nla_put_failure;
5317
f53adae4
DB		 5318 read_lock_bh(&idev->lock);
5319 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5320 read_unlock_bh(&idev->lock);
5321
b382b191
TG		 5322 return 0;
5323
5324nla_put_failure:
5325 return -EMSGSIZE;
5326}
5327
b1974ed0
AR		 5328static size_t inet6_get_link_af_size(const struct net_device *dev,
5329 u32 ext_filter_mask)
b382b191
TG		 5330{
5331 if (!__in6_dev_get(dev))
5332 return 0;
5333
5334 return inet6_ifla6_size();
5335}
5336
d5566fd7
SV		 5337static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5338 u32 ext_filter_mask)
b382b191
TG		 5339{
5340 struct inet6_dev *idev = __in6_dev_get(dev);
5341
5342 if (!idev)
5343 return -ENODATA;
5344
d5566fd7 5345 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5346 return -EMSGSIZE;
5347
5348 return 0;
5349}
5350
f53adae4
DB		 5351static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5352{
f53adae4
DB		 5353 struct inet6_ifaddr *ifp;
5354 struct net_device *dev = idev->dev;
47e27d5e 5355 bool clear_token, update_rs = false;
dc848292 5356 struct in6_addr ll_addr;
f53adae4 5357
c15b1cca
HFS		 5358 ASSERT_RTNL();
5359
63159f29 5360 if (!token)
f53adae4 5361 return -EINVAL;
f53adae4
DB		 5362 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5363 return -EINVAL;
f53adae4
DB		 5364 if (!ipv6_accept_ra(idev))
5365 return -EINVAL;
bd11f074 5366 if (idev->cnf.rtr_solicits == 0)
f53adae4
DB		 5367 return -EINVAL;
5368
5369 write_lock_bh(&idev->lock);
5370
5371 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5372 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5373
5374 write_unlock_bh(&idev->lock);
5375
47e27d5e
DB		 5376 clear_token = ipv6_addr_any(token);
5377 if (clear_token)
5378 goto update_lft;
5379
dc848292
HFS		 5380 if (!idev->dead && (idev->if_flags & IF_READY) &&
5381 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5382 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5383 /* If we're not ready, then normal ifup will take care
5384 * of this. Otherwise, we need to request our rs here.
5385 */
5386 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5387 update_rs = true;
5388 }
f53adae4 5389
47e27d5e 5390update_lft:
f53adae4 5391 write_lock_bh(&idev->lock);
fc403832 5392
77ecaace 5393 if (update_rs) {
fc403832 5394 idev->if_flags |= IF_RS_SENT;
bd11f074
MŻ		 5395 idev->rs_interval = rfc3315_s14_backoff_init(
5396 idev->cnf.rtr_solicit_interval);
77ecaace 5397 idev->rs_probes = 1;
bd11f074 5398 addrconf_mod_rs_timer(idev, idev->rs_interval);
77ecaace 5399 }
f53adae4
DB		 5400
5401 /* Well, that's kinda nasty ... */
5402 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5403 spin_lock(&ifp->lock);
617fe29d 5404 if (ifp->tokenized) {
f53adae4
DB		 5405 ifp->valid_lft = 0;
5406 ifp->prefered_lft = 0;
5407 }
5408 spin_unlock(&ifp->lock);
5409 }
5410
5411 write_unlock_bh(&idev->lock);
b2ed64a9 5412 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 5413 addrconf_verify_rtnl();
f53adae4
DB		 5414 return 0;
5415}
5416
11b1f828
DB		 5417static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5418 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5419 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5420};
5421
5422static int inet6_validate_link_af(const struct net_device *dev,
5423 const struct nlattr *nla)
5424{
5425 struct nlattr *tb[IFLA_INET6_MAX + 1];
5426
5427 if (dev && !__in6_dev_get(dev))
5428 return -EAFNOSUPPORT;
5429
fceb6435
JB		 5430 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5431 NULL);
11b1f828
DB		 5432}
5433
d35a00b8
FJ		 5434static int check_addr_gen_mode(int mode)
5435{
5436 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5437 mode != IN6_ADDR_GEN_MODE_NONE &&
5438 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5439 mode != IN6_ADDR_GEN_MODE_RANDOM)
5440 return -EINVAL;
5441 return 1;
5442}
5443
5444static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5445 int mode)
5446{
5447 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5448 !idev->cnf.stable_secret.initialized &&
5449 !net->ipv6.devconf_dflt->stable_secret.initialized)
5450 return -EINVAL;
5451 return 1;
5452}
5453
f53adae4
DB		 5454static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5455{
5456 int err = -EINVAL;
5457 struct inet6_dev *idev = __in6_dev_get(dev);
5458 struct nlattr *tb[IFLA_INET6_MAX + 1];
5459
5460 if (!idev)
5461 return -EAFNOSUPPORT;
5462
fceb6435 5463 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
f53adae4
DB		 5464 BUG();
5465
bc91b0f0 5466 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 5467 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 5468 if (err)
5469 return err;
5470 }
5471
5472 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5473 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5474
d35a00b8
FJ		 5475 if (check_addr_gen_mode(mode) < 0 ||
5476 check_stable_privacy(idev, dev_net(dev), mode) < 0)
bc91b0f0 5477 return -EINVAL;
622c81d5 5478
d35a00b8 5479 idev->cnf.addr_gen_mode = mode;
bc91b0f0
JP		 5480 err = 0;
5481 }
f53adae4
DB		 5482
5483 return err;
5484}
5485
1ab1457c 5486static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5487 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5488{
04561c1f 5489 struct net_device *dev = idev->dev;
04561c1f
TG		 5490 struct ifinfomsg *hdr;
5491 struct nlmsghdr *nlh;
5492 void *protoinfo;
04561c1f 5493
15e47304 5494 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5495 if (!nlh)
26932566 5496 return -EMSGSIZE;
04561c1f
TG		 5497
5498 hdr = nlmsg_data(nlh);
5499 hdr->ifi_family = AF_INET6;
5500 hdr->__ifi_pad = 0;
5501 hdr->ifi_type = dev->type;
5502 hdr->ifi_index = dev->ifindex;
5503 hdr->ifi_flags = dev_get_flags(dev);
5504 hdr->ifi_change = 0;
5505
c78679e8
DM		 5506 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5507 (dev->addr_len &&
5508 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5509 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5510 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5511 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5512 nla_put_u8(skb, IFLA_OPERSTATE,
5513 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5514 goto nla_put_failure;
04561c1f 5515 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 5516 if (!protoinfo)
04561c1f 5517 goto nla_put_failure;
1da177e4 5518
d5566fd7 5519 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5520 goto nla_put_failure;
1da177e4 5521
04561c1f 5522 nla_nest_end(skb, protoinfo);
053c095a
JB		 5523 nlmsg_end(skb, nlh);
5524 return 0;
1da177e4 5525
04561c1f 5526nla_put_failure:
26932566
PM		 5527 nlmsg_cancel(skb, nlh);
5528 return -EMSGSIZE;
1da177e4
LT		 5529}
5530
5531static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5532{
3b1e0a65 5533 struct net *net = sock_net(skb->sk);
84d2697d 5534 int h, s_h;
434a8a58 5535 int idx = 0, s_idx;
1da177e4
LT		 5536 struct net_device *dev;
5537 struct inet6_dev *idev;
84d2697d 5538 struct hlist_head *head;
1da177e4 5539
84d2697d
ED		 5540 s_h = cb->args[0];
5541 s_idx = cb->args[1];
5542
5543 rcu_read_lock();
5544 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5545 idx = 0;
5546 head = &net->dev_index_head[h];
b67bfe0d 5547 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5548 if (idx < s_idx)
5549 goto cont;
5550 idev = __in6_dev_get(dev);
5551 if (!idev)
5552 goto cont;
5553 if (inet6_fill_ifinfo(skb, idev,
15e47304 5554 NETLINK_CB(cb->skb).portid,
84d2697d 5555 cb->nlh->nlmsg_seq,
053c095a 5556 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5557 goto out;
7562f876 5558cont:
84d2697d
ED		 5559 idx++;
5560 }
1da177e4 5561 }
84d2697d
ED		 5562out:
5563 rcu_read_unlock();
5564 cb->args[1] = idx;
5565 cb->args[0] = h;
1da177e4
LT		 5566
5567 return skb->len;
5568}
5569
5570void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5571{
5572 struct sk_buff *skb;
c346dca1 5573 struct net *net = dev_net(idev->dev);
8d7a76c9 5574 int err = -ENOBUFS;
1ab1457c 5575
339bf98f 5576 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5577 if (!skb)
8d7a76c9
TG		 5578 goto errout;
5579
5580 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5581 if (err < 0) {
5582 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5583 WARN_ON(err == -EMSGSIZE);
5584 kfree_skb(skb);
5585 goto errout;
5586 }
5f75a104 5587 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5588 return;
8d7a76c9
TG		 5589errout:
5590 if (err < 0)
5f75a104 5591 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5592}
5593
339bf98f
TG		 5594static inline size_t inet6_prefix_nlmsg_size(void)
5595{
5596 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5597 + nla_total_size(sizeof(struct in6_addr))
5598 + nla_total_size(sizeof(struct prefix_cacheinfo));
5599}
c5396a31 5600
1da177e4 5601static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5602 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5603 int event, unsigned int flags)
1da177e4 5604{
6051e2f4
TG		 5605 struct prefixmsg *pmsg;
5606 struct nlmsghdr *nlh;
1da177e4
LT		 5607 struct prefix_cacheinfo ci;
5608
15e47304 5609 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5610 if (!nlh)
26932566 5611 return -EMSGSIZE;
6051e2f4
TG		 5612
5613 pmsg = nlmsg_data(nlh);
1da177e4 5614 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5615 pmsg->prefix_pad1 = 0;
5616 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5617 pmsg->prefix_ifindex = idev->dev->ifindex;
5618 pmsg->prefix_len = pinfo->prefix_len;
5619 pmsg->prefix_type = pinfo->type;
8a47077a 5620 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5621 pmsg->prefix_flags = 0;
5622 if (pinfo->onlink)
5623 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5624 if (pinfo->autoconf)
5625 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5626
c78679e8
DM		 5627 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5628 goto nla_put_failure;
1da177e4
LT		 5629 ci.preferred_time = ntohl(pinfo->prefered);
5630 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5631 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5632 goto nla_put_failure;
053c095a
JB		 5633 nlmsg_end(skb, nlh);
5634 return 0;
1da177e4 5635
6051e2f4 5636nla_put_failure:
26932566
PM		 5637 nlmsg_cancel(skb, nlh);
5638 return -EMSGSIZE;
1da177e4
LT		 5639}
5640
1ab1457c 5641static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5642 struct prefix_info *pinfo)
5643{
5644 struct sk_buff *skb;
c346dca1 5645 struct net *net = dev_net(idev->dev);
8c384bfa 5646 int err = -ENOBUFS;
1da177e4 5647
339bf98f 5648 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5649 if (!skb)
8c384bfa
TG		 5650 goto errout;
5651
5652 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5653 if (err < 0) {
5654 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5655 WARN_ON(err == -EMSGSIZE);
5656 kfree_skb(skb);
5657 goto errout;
5658 }
1ce85fe4
PNA		 5659 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5660 return;
8c384bfa
TG		 5661errout:
5662 if (err < 0)
6fda7350 5663 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5664}
5665
1da177e4
LT		 5666static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5667{
63998ac2
ND		 5668 struct net *net = dev_net(ifp->idev->dev);
5669
c15b1cca
HFS		 5670 if (event)
5671 ASSERT_RTNL();
5672
1da177e4
LT		 5673 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5674
5675 switch (event) {
5676 case RTM_NEWADDR:
95c385b4
NH		 5677 /*
5678 * If the address was optimistic
5679 * we inserted the route at the start of
5680 * our DAD process, so we don't need
5681 * to do it again
5682 */
93c2fb25 5683 if (!rcu_access_pointer(ifp->rt->fib6_node))
afb1d4b5 5684 ip6_ins_rt(net, ifp->rt);
1da177e4
LT		 5685 if (ifp->idev->cnf.forwarding)
5686 addrconf_join_anycast(ifp);
7996c799 5687 if (!ipv6_addr_any(&ifp->peer_addr))
8308f3ff 5688 addrconf_prefix_route(&ifp->peer_addr, 128, 0,
acb54e3c 5689 ifp->idev->dev, 0, 0,
27b10608 5690 GFP_ATOMIC);
1da177e4
LT		 5691 break;
5692 case RTM_DELADDR:
5693 if (ifp->idev->cnf.forwarding)
5694 addrconf_leave_anycast(ifp);
5695 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5696 if (!ipv6_addr_any(&ifp->peer_addr)) {
8d1c802b 5697 struct fib6_info *rt;
caeaba79 5698
e7478dfc
ND		 5699 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5700 ifp->idev->dev, 0, 0);
8e3d5be7 5701 if (rt)
afb1d4b5 5702 ip6_del_rt(net, rt);
caeaba79 5703 }
38bd10c4 5704 if (ifp->rt) {
93531c67
DA		 5705 ip6_del_rt(net, ifp->rt);
5706 ifp->rt = NULL;
38bd10c4 5707 }
705f1c86 5708 rt_genid_bump_ipv6(net);
1da177e4
LT		 5709 break;
5710 }
63998ac2 5711 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5712}
5713
5714static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5715{
8814c4b5 5716 rcu_read_lock_bh();
1da177e4
LT		 5717 if (likely(ifp->idev->dead == 0))
5718 __ipv6_ifa_notify(event, ifp);
8814c4b5 5719 rcu_read_unlock_bh();
1da177e4
LT		 5720}
5721
5722#ifdef CONFIG_SYSCTL
5723
5724static
fe2c6338 5725int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5726 void __user *buffer, size_t *lenp, loff_t *ppos)
5727{
5728 int *valp = ctl->data;
5729 int val = *valp;
88af182e 5730 loff_t pos = *ppos;
fe2c6338 5731 struct ctl_table lctl;
1da177e4
LT		 5732 int ret;
5733
013d97e9
FR		 5734 /*
5735 * ctl->data points to idev->cnf.forwarding, we should
5736 * not modify it until we get the rtnl lock.
5737 */
5738 lctl = *ctl;
5739 lctl.data = &val;
5740
5741 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5742
c8fecf22 5743 if (write)
b325fddb 5744 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5745 if (ret)
5746 *ppos = pos;
1ab1457c 5747 return ret;
1da177e4
LT		 5748}
5749
77751427
ML		 5750static
5751int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5752 void __user *buffer, size_t *lenp, loff_t *ppos)
5753{
5754 struct inet6_dev *idev = ctl->extra1;
5755 int min_mtu = IPV6_MIN_MTU;
5756 struct ctl_table lctl;
5757
5758 lctl = *ctl;
5759 lctl.extra1 = &min_mtu;
5760 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5761
5762 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5763}
5764
56d417b1
BH		 5765static void dev_disable_change(struct inet6_dev *idev)
5766{
75538c2b
CW		 5767 struct netdev_notifier_info info;
5768
56d417b1
BH		 5769 if (!idev || !idev->dev)
5770 return;
5771
75538c2b 5772 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5773 if (idev->cnf.disable_ipv6)
75538c2b 5774 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5775 else
75538c2b 5776 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5777}
5778
5779static void addrconf_disable_change(struct net *net, __s32 newf)
5780{
5781 struct net_device *dev;
5782 struct inet6_dev *idev;
5783
03e4deff 5784 for_each_netdev(net, dev) {
56d417b1
BH		 5785 idev = __in6_dev_get(dev);
5786 if (idev) {
5787 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5788 idev->cnf.disable_ipv6 = newf;
5789 if (changed)
5790 dev_disable_change(idev);
5791 }
56d417b1 5792 }
56d417b1
BH		 5793}
5794
013d97e9 5795static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5796{
5797 struct net *net;
013d97e9
FR		 5798 int old;
5799
5800 if (!rtnl_trylock())
5801 return restart_syscall();
56d417b1
BH		 5802
5803 net = (struct net *)table->extra2;
013d97e9
FR		 5804 old = *p;
5805 *p = newf;
56d417b1 5806
013d97e9
FR		 5807 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5808 rtnl_unlock();
56d417b1 5809 return 0;
88af182e 5810 }
56d417b1
BH		 5811
5812 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5813 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5814 addrconf_disable_change(net, newf);
013d97e9 5815 } else if ((!newf) ^ (!old))
56d417b1
BH		 5816 dev_disable_change((struct inet6_dev *)table->extra1);
5817
5818 rtnl_unlock();
5819 return 0;
5820}
5821
5822static
fe2c6338 5823int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5824 void __user *buffer, size_t *lenp, loff_t *ppos)
5825{
5826 int *valp = ctl->data;
5827 int val = *valp;
88af182e 5828 loff_t pos = *ppos;
fe2c6338 5829 struct ctl_table lctl;
56d417b1
BH		 5830 int ret;
5831
013d97e9
FR		 5832 /*
5833 * ctl->data points to idev->cnf.disable_ipv6, we should
5834 * not modify it until we get the rtnl lock.
5835 */
5836 lctl = *ctl;
5837 lctl.data = &val;
5838
5839 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5840
5841 if (write)
5842 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5843 if (ret)
5844 *ppos = pos;
56d417b1
BH		 5845 return ret;
5846}
5847
c92d5491 5848static
5849int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5850 void __user *buffer, size_t *lenp, loff_t *ppos)
5851{
5852 int *valp = ctl->data;
5853 int ret;
5854 int old, new;
5855
5856 old = *valp;
5857 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5858 new = *valp;
5859
5860 if (write && old != new) {
5861 struct net *net = ctl->extra2;
5862
5863 if (!rtnl_trylock())
5864 return restart_syscall();
5865
5866 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
85b3daad
DA		 5867 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5868 NETCONFA_PROXY_NEIGH,
c92d5491 5869 NETCONFA_IFINDEX_DEFAULT,
5870 net->ipv6.devconf_dflt);
5871 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
85b3daad
DA		 5872 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5873 NETCONFA_PROXY_NEIGH,
c92d5491 5874 NETCONFA_IFINDEX_ALL,
5875 net->ipv6.devconf_all);
5876 else {
5877 struct inet6_dev *idev = ctl->extra1;
5878
85b3daad
DA		 5879 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5880 NETCONFA_PROXY_NEIGH,
c92d5491 5881 idev->dev->ifindex,
5882 &idev->cnf);
5883 }
5884 rtnl_unlock();
5885 }
5886
5887 return ret;
5888}
5889
d35a00b8
FJ		 5890static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5891 void __user *buffer, size_t *lenp,
5892 loff_t *ppos)
5893{
5894 int ret = 0;
5895 int new_val;
5896 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5897 struct net *net = (struct net *)ctl->extra2;
5898
8c171d6c
FJ		 5899 if (!rtnl_trylock())
5900 return restart_syscall();
5901
d35a00b8
FJ		 5902 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5903
5904 if (write) {
5905 new_val = *((int *)ctl->data);
5906
8c171d6c
FJ		 5907 if (check_addr_gen_mode(new_val) < 0) {
5908 ret = -EINVAL;
5909 goto out;
5910 }
d35a00b8
FJ		 5911
5912 /* request for default */
5913 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5914 ipv6_devconf_dflt.addr_gen_mode = new_val;
5915
5916 /* request for individual net device */
5917 } else {
5918 if (!idev)
8c171d6c 5919 goto out;
d35a00b8 5920
8c171d6c
FJ		 5921 if (check_stable_privacy(idev, net, new_val) < 0) {
5922 ret = -EINVAL;
5923 goto out;
5924 }
d35a00b8
FJ		 5925
5926 if (idev->cnf.addr_gen_mode != new_val) {
5927 idev->cnf.addr_gen_mode = new_val;
d35a00b8 5928 addrconf_dev_config(idev->dev);
d35a00b8
FJ		 5929 }
5930 }
5931 }
5932
8c171d6c
FJ		 5933out:
5934 rtnl_unlock();
5935
d35a00b8
FJ		 5936 return ret;
5937}
5938
3d1bec99
HFS		 5939static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5940 void __user *buffer, size_t *lenp,
5941 loff_t *ppos)
5942{
5943 int err;
5944 struct in6_addr addr;
5945 char str[IPV6_MAX_STRLEN];
5946 struct ctl_table lctl = *ctl;
622c81d5 5947 struct net *net = ctl->extra2;
3d1bec99
HFS		 5948 struct ipv6_stable_secret *secret = ctl->data;
5949
622c81d5
HFS		 5950 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5951 return -EIO;
5952
3d1bec99
HFS		 5953 lctl.maxlen = IPV6_MAX_STRLEN;
5954 lctl.data = str;
5955
5956 if (!rtnl_trylock())
5957 return restart_syscall();
5958
5959 if (!write && !secret->initialized) {
5960 err = -EIO;
5961 goto out;
5962 }
5963
5449a5ca
WC		 5964 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5965 if (err >= sizeof(str)) {
5966 err = -EIO;
5967 goto out;
3d1bec99
HFS		 5968 }
5969
5970 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5971 if (err || !write)
5972 goto out;
5973
5974 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5975 err = -EIO;
5976 goto out;
5977 }
5978
5979 secret->initialized = true;
5980 secret->secret = addr;
5981
622c81d5
HFS		 5982 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5983 struct net_device *dev;
5984
5985 for_each_netdev(net, dev) {
5986 struct inet6_dev *idev = __in6_dev_get(dev);
5987
5988 if (idev) {
d35a00b8 5989 idev->cnf.addr_gen_mode =
622c81d5
HFS		 5990 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5991 }
5992 }
5993 } else {
5994 struct inet6_dev *idev = ctl->extra1;
5995
d35a00b8 5996 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
622c81d5
HFS		 5997 }
5998
3d1bec99
HFS		 5999out:
6000 rtnl_unlock();
6001
6002 return err;
6003}
c92d5491 6004
35103d11
AG		 6005static
6006int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6007 int write,
6008 void __user *buffer,
6009 size_t *lenp,
6010 loff_t *ppos)
6011{
6012 int *valp = ctl->data;
6013 int val = *valp;
6014 loff_t pos = *ppos;
6015 struct ctl_table lctl;
6016 int ret;
6017
6018 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6019 * we should not modify it until we get the rtnl lock.
6020 */
6021 lctl = *ctl;
6022 lctl.data = &val;
6023
6024 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6025
6026 if (write)
6027 ret = addrconf_fixup_linkdown(ctl, valp, val);
6028 if (ret)
6029 *ppos = pos;
6030 return ret;
6031}
6032
df789fe7
DF		 6033static
6034void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6035{
6036 if (rt) {
6037 if (action)
6038 rt->dst.flags |= DST_NOPOLICY;
6039 else
6040 rt->dst.flags &= ~DST_NOPOLICY;
6041 }
6042}
6043
6044static
6045void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6046{
6047 struct inet6_ifaddr *ifa;
6048
6049 read_lock_bh(&idev->lock);
6050 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6051 spin_lock(&ifa->lock);
6052 if (ifa->rt) {
8d1c802b 6053 struct fib6_info *rt = ifa->rt;
df789fe7
DF		 6054 int cpu;
6055
66f5d6ce 6056 rcu_read_lock();
3b6761d1 6057 ifa->rt->dst_nopolicy = val ? true : false;
df789fe7
DF		 6058 if (rt->rt6i_pcpu) {
6059 for_each_possible_cpu(cpu) {
6060 struct rt6_info **rtp;
6061
6062 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
6063 addrconf_set_nopolicy(*rtp, val);
6064 }
6065 }
66f5d6ce 6066 rcu_read_unlock();
df789fe7
DF		 6067 }
6068 spin_unlock(&ifa->lock);
6069 }
6070 read_unlock_bh(&idev->lock);
6071}
6072
6073static
6074int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6075{
6076 struct inet6_dev *idev;
6077 struct net *net;
6078
6079 if (!rtnl_trylock())
6080 return restart_syscall();
6081
6082 *valp = val;
6083
6084 net = (struct net *)ctl->extra2;
6085 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6086 rtnl_unlock();
6087 return 0;
6088 }
6089
6090 if (valp == &net->ipv6.devconf_all->disable_policy) {
6091 struct net_device *dev;
6092
6093 for_each_netdev(net, dev) {
6094 idev = __in6_dev_get(dev);
6095 if (idev)
6096 addrconf_disable_policy_idev(idev, val);
6097 }
6098 } else {
6099 idev = (struct inet6_dev *)ctl->extra1;
6100 addrconf_disable_policy_idev(idev, val);
6101 }
6102
6103 rtnl_unlock();
6104 return 0;
6105}
6106
6107static
6108int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6109 void __user *buffer, size_t *lenp,
6110 loff_t *ppos)
6111{
6112 int *valp = ctl->data;
6113 int val = *valp;
6114 loff_t pos = *ppos;
6115 struct ctl_table lctl;
6116 int ret;
6117
6118 lctl = *ctl;
6119 lctl.data = &val;
6120 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6121
6122 if (write && (*valp != val))
6123 ret = addrconf_disable_policy(ctl, valp, val);
6124
6125 if (ret)
6126 *ppos = pos;
6127
6128 return ret;
6129}
6130
cb4a4c69 6131static int minus_one = -1;
2210d6b2 6132static const int zero = 0;
cb9e684e
MŻ		 6133static const int one = 1;
6134static const int two_five_five = 255;
6135
607ea7cd 6136static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 6137 {
6138 .procname = "forwarding",
6139 .data = &ipv6_devconf.forwarding,
6140 .maxlen = sizeof(int),
6141 .mode = 0644,
6142 .proc_handler = addrconf_sysctl_forward,
6143 },
6144 {
6145 .procname = "hop_limit",
6146 .data = &ipv6_devconf.hop_limit,
6147 .maxlen = sizeof(int),
6148 .mode = 0644,
cb9e684e
MŻ		 6149 .proc_handler = proc_dointvec_minmax,
6150 .extra1 = (void *)&one,
6151 .extra2 = (void *)&two_five_five,
5df1f77f
KK		 6152 },
6153 {
6154 .procname = "mtu",
6155 .data = &ipv6_devconf.mtu6,
6156 .maxlen = sizeof(int),
6157 .mode = 0644,
6158 .proc_handler = addrconf_sysctl_mtu,
6159 },
6160 {
6161 .procname = "accept_ra",
6162 .data = &ipv6_devconf.accept_ra,
6163 .maxlen = sizeof(int),
6164 .mode = 0644,
6165 .proc_handler = proc_dointvec,
6166 },
6167 {
6168 .procname = "accept_redirects",
6169 .data = &ipv6_devconf.accept_redirects,
6170 .maxlen = sizeof(int),
6171 .mode = 0644,
6172 .proc_handler = proc_dointvec,
6173 },
6174 {
6175 .procname = "autoconf",
6176 .data = &ipv6_devconf.autoconf,
6177 .maxlen = sizeof(int),
6178 .mode = 0644,
6179 .proc_handler = proc_dointvec,
6180 },
6181 {
6182 .procname = "dad_transmits",
6183 .data = &ipv6_devconf.dad_transmits,
6184 .maxlen = sizeof(int),
6185 .mode = 0644,
6186 .proc_handler = proc_dointvec,
6187 },
6188 {
6189 .procname = "router_solicitations",
6190 .data = &ipv6_devconf.rtr_solicits,
6191 .maxlen = sizeof(int),
6192 .mode = 0644,
cb4a4c69
MŻ		 6193 .proc_handler = proc_dointvec_minmax,
6194 .extra1 = &minus_one,
5df1f77f
KK		 6195 },
6196 {
6197 .procname = "router_solicitation_interval",
6198 .data = &ipv6_devconf.rtr_solicit_interval,
6199 .maxlen = sizeof(int),
6200 .mode = 0644,
6201 .proc_handler = proc_dointvec_jiffies,
6202 },
bd11f074
MŻ		 6203 {
6204 .procname = "router_solicitation_max_interval",
6205 .data = &ipv6_devconf.rtr_solicit_max_interval,
6206 .maxlen = sizeof(int),
6207 .mode = 0644,
6208 .proc_handler = proc_dointvec_jiffies,
6209 },
5df1f77f
KK		 6210 {
6211 .procname = "router_solicitation_delay",
6212 .data = &ipv6_devconf.rtr_solicit_delay,
6213 .maxlen = sizeof(int),
6214 .mode = 0644,
6215 .proc_handler = proc_dointvec_jiffies,
6216 },
6217 {
6218 .procname = "force_mld_version",
6219 .data = &ipv6_devconf.force_mld_version,
6220 .maxlen = sizeof(int),
6221 .mode = 0644,
6222 .proc_handler = proc_dointvec,
6223 },
6224 {
6225 .procname = "mldv1_unsolicited_report_interval",
6226 .data =
6227 &ipv6_devconf.mldv1_unsolicited_report_interval,
6228 .maxlen = sizeof(int),
6229 .mode = 0644,
6230 .proc_handler = proc_dointvec_ms_jiffies,
6231 },
6232 {
6233 .procname = "mldv2_unsolicited_report_interval",
6234 .data =
6235 &ipv6_devconf.mldv2_unsolicited_report_interval,
6236 .maxlen = sizeof(int),
6237 .mode = 0644,
6238 .proc_handler = proc_dointvec_ms_jiffies,
6239 },
6240 {
6241 .procname = "use_tempaddr",
6242 .data = &ipv6_devconf.use_tempaddr,
6243 .maxlen = sizeof(int),
6244 .mode = 0644,
6245 .proc_handler = proc_dointvec,
6246 },
6247 {
6248 .procname = "temp_valid_lft",
6249 .data = &ipv6_devconf.temp_valid_lft,
6250 .maxlen = sizeof(int),
6251 .mode = 0644,
6252 .proc_handler = proc_dointvec,
6253 },
6254 {
6255 .procname = "temp_prefered_lft",
6256 .data = &ipv6_devconf.temp_prefered_lft,
6257 .maxlen = sizeof(int),
6258 .mode = 0644,
6259 .proc_handler = proc_dointvec,
6260 },
6261 {
6262 .procname = "regen_max_retry",
6263 .data = &ipv6_devconf.regen_max_retry,
6264 .maxlen = sizeof(int),
6265 .mode = 0644,
6266 .proc_handler = proc_dointvec,
6267 },
6268 {
6269 .procname = "max_desync_factor",
6270 .data = &ipv6_devconf.max_desync_factor,
6271 .maxlen = sizeof(int),
6272 .mode = 0644,
6273 .proc_handler = proc_dointvec,
6274 },
6275 {
6276 .procname = "max_addresses",
6277 .data = &ipv6_devconf.max_addresses,
6278 .maxlen = sizeof(int),
6279 .mode = 0644,
6280 .proc_handler = proc_dointvec,
6281 },
6282 {
6283 .procname = "accept_ra_defrtr",
6284 .data = &ipv6_devconf.accept_ra_defrtr,
6285 .maxlen = sizeof(int),
6286 .mode = 0644,
6287 .proc_handler = proc_dointvec,
6288 },
6289 {
6290 .procname = "accept_ra_min_hop_limit",
6291 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6292 .maxlen = sizeof(int),
6293 .mode = 0644,
6294 .proc_handler = proc_dointvec,
6295 },
6296 {
6297 .procname = "accept_ra_pinfo",
6298 .data = &ipv6_devconf.accept_ra_pinfo,
6299 .maxlen = sizeof(int),
6300 .mode = 0644,
6301 .proc_handler = proc_dointvec,
6302 },
930d6ff2 6303#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 6304 {
6305 .procname = "accept_ra_rtr_pref",
6306 .data = &ipv6_devconf.accept_ra_rtr_pref,
6307 .maxlen = sizeof(int),
6308 .mode = 0644,
6309 .proc_handler = proc_dointvec,
6310 },
6311 {
6312 .procname = "router_probe_interval",
6313 .data = &ipv6_devconf.rtr_probe_interval,
6314 .maxlen = sizeof(int),
6315 .mode = 0644,
6316 .proc_handler = proc_dointvec_jiffies,
6317 },
fa03ef38 6318#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b
JS		 6319 {
6320 .procname = "accept_ra_rt_info_min_plen",
6321 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6322 .maxlen = sizeof(int),
6323 .mode = 0644,
6324 .proc_handler = proc_dointvec,
6325 },
5df1f77f
KK		 6326 {
6327 .procname = "accept_ra_rt_info_max_plen",
6328 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6329 .maxlen = sizeof(int),
6330 .mode = 0644,
6331 .proc_handler = proc_dointvec,
6332 },
09c884d4 6333#endif
930d6ff2 6334#endif
5df1f77f
KK		 6335 {
6336 .procname = "proxy_ndp",
6337 .data = &ipv6_devconf.proxy_ndp,
6338 .maxlen = sizeof(int),
6339 .mode = 0644,
6340 .proc_handler = addrconf_sysctl_proxy_ndp,
6341 },
6342 {
6343 .procname = "accept_source_route",
6344 .data = &ipv6_devconf.accept_source_route,
6345 .maxlen = sizeof(int),
6346 .mode = 0644,
6347 .proc_handler = proc_dointvec,
6348 },
95c385b4 6349#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 6350 {
6351 .procname = "optimistic_dad",
6352 .data = &ipv6_devconf.optimistic_dad,
6353 .maxlen = sizeof(int),
6354 .mode = 0644,
6355 .proc_handler = proc_dointvec,
6356 },
6357 {
6358 .procname = "use_optimistic",
6359 .data = &ipv6_devconf.use_optimistic,
6360 .maxlen = sizeof(int),
6361 .mode = 0644,
6362 .proc_handler = proc_dointvec,
6363 },
7bc570c8
YH		 6364#endif
6365#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 6366 {
6367 .procname = "mc_forwarding",
6368 .data = &ipv6_devconf.mc_forwarding,
6369 .maxlen = sizeof(int),
6370 .mode = 0444,
6371 .proc_handler = proc_dointvec,
6372 },
95c385b4 6373#endif
5df1f77f
KK		 6374 {
6375 .procname = "disable_ipv6",
6376 .data = &ipv6_devconf.disable_ipv6,
6377 .maxlen = sizeof(int),
6378 .mode = 0644,
6379 .proc_handler = addrconf_sysctl_disable,
6380 },
6381 {
6382 .procname = "accept_dad",
6383 .data = &ipv6_devconf.accept_dad,
6384 .maxlen = sizeof(int),
6385 .mode = 0644,
6386 .proc_handler = proc_dointvec,
6387 },
6388 {
6389 .procname = "force_tllao",
6390 .data = &ipv6_devconf.force_tllao,
6391 .maxlen = sizeof(int),
6392 .mode = 0644,
6393 .proc_handler = proc_dointvec
6394 },
6395 {
6396 .procname = "ndisc_notify",
6397 .data = &ipv6_devconf.ndisc_notify,
6398 .maxlen = sizeof(int),
6399 .mode = 0644,
6400 .proc_handler = proc_dointvec
6401 },
6402 {
6403 .procname = "suppress_frag_ndisc",
6404 .data = &ipv6_devconf.suppress_frag_ndisc,
6405 .maxlen = sizeof(int),
6406 .mode = 0644,
6407 .proc_handler = proc_dointvec
6408 },
6409 {
6410 .procname = "accept_ra_from_local",
6411 .data = &ipv6_devconf.accept_ra_from_local,
6412 .maxlen = sizeof(int),
6413 .mode = 0644,
6414 .proc_handler = proc_dointvec,
6415 },
6416 {
6417 .procname = "accept_ra_mtu",
6418 .data = &ipv6_devconf.accept_ra_mtu,
6419 .maxlen = sizeof(int),
6420 .mode = 0644,
6421 .proc_handler = proc_dointvec,
6422 },
6423 {
6424 .procname = "stable_secret",
6425 .data = &ipv6_devconf.stable_secret,
6426 .maxlen = IPV6_MAX_STRLEN,
6427 .mode = 0600,
6428 .proc_handler = addrconf_sysctl_stable_secret,
6429 },
6430 {
6431 .procname = "use_oif_addrs_only",
6432 .data = &ipv6_devconf.use_oif_addrs_only,
6433 .maxlen = sizeof(int),
6434 .mode = 0644,
6435 .proc_handler = proc_dointvec,
6436 },
6437 {
6438 .procname = "ignore_routes_with_linkdown",
6439 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6440 .maxlen = sizeof(int),
6441 .mode = 0644,
6442 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6443 },
6444 {
6445 .procname = "drop_unicast_in_l2_multicast",
6446 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6447 .maxlen = sizeof(int),
6448 .mode = 0644,
6449 .proc_handler = proc_dointvec,
6450 },
6451 {
6452 .procname = "drop_unsolicited_na",
6453 .data = &ipv6_devconf.drop_unsolicited_na,
6454 .maxlen = sizeof(int),
6455 .mode = 0644,
6456 .proc_handler = proc_dointvec,
6457 },
6458 {
6459 .procname = "keep_addr_on_down",
6460 .data = &ipv6_devconf.keep_addr_on_down,
6461 .maxlen = sizeof(int),
6462 .mode = 0644,
6463 .proc_handler = proc_dointvec,
6464
6465 },
1ababeba
DL		 6466 {
6467 .procname = "seg6_enabled",
6468 .data = &ipv6_devconf.seg6_enabled,
6469 .maxlen = sizeof(int),
6470 .mode = 0644,
6471 .proc_handler = proc_dointvec,
6472 },
bf355b8d
DL		 6473#ifdef CONFIG_IPV6_SEG6_HMAC
6474 {
6475 .procname = "seg6_require_hmac",
6476 .data = &ipv6_devconf.seg6_require_hmac,
6477 .maxlen = sizeof(int),
6478 .mode = 0644,
6479 .proc_handler = proc_dointvec,
6480 },
6481#endif
adc176c5
EN		 6482 {
6483 .procname = "enhanced_dad",
6484 .data = &ipv6_devconf.enhanced_dad,
6485 .maxlen = sizeof(int),
6486 .mode = 0644,
6487 .proc_handler = proc_dointvec,
6488 },
d35a00b8
FJ		 6489 {
6490 .procname = "addr_gen_mode",
6491 .data = &ipv6_devconf.addr_gen_mode,
6492 .maxlen = sizeof(int),
6493 .mode = 0644,
6494 .proc_handler = addrconf_sysctl_addr_gen_mode,
6495 },
df789fe7
DF		 6496 {
6497 .procname = "disable_policy",
6498 .data = &ipv6_devconf.disable_policy,
6499 .maxlen = sizeof(int),
6500 .mode = 0644,
6501 .proc_handler = addrconf_sysctl_disable_policy,
6502 },
2210d6b2
MŻ		 6503 {
6504 .procname = "ndisc_tclass",
6505 .data = &ipv6_devconf.ndisc_tclass,
6506 .maxlen = sizeof(int),
6507 .mode = 0644,
6508 .proc_handler = proc_dointvec_minmax,
6509 .extra1 = (void *)&zero,
6510 .extra2 = (void *)&two_five_five,
6511 },
5df1f77f
KK		 6512 {
6513 /* sentinel */
6514 }
1da177e4
LT		 6515};
6516
bff16c2f 6517static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 6518 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4 6519{
29c994e3 6520 int i, ifindex;
607ea7cd 6521 struct ctl_table *table;
6105e293 6522 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 6523
607ea7cd
KK		 6524 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6525 if (!table)
f68635e6
PE		 6526 goto out;
6527
607ea7cd
KK		 6528 for (i = 0; table[i].data; i++) {
6529 table[i].data += (char *)p - (char *)&ipv6_devconf;
cb9e684e
MŻ		 6530 /* If one of these is already set, then it is not safe to
6531 * overwrite either of them: this makes proc_dointvec_minmax
6532 * usable.
6533 */
6534 if (!table[i].extra1 && !table[i].extra2) {
6535 table[i].extra1 = idev; /* embedded; no ref */
6536 table[i].extra2 = net;
6537 }
1da177e4 6538 }
1da177e4 6539
6105e293 6540 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 6541
607ea7cd
KK		 6542 p->sysctl_header = register_net_sysctl(net, path, table);
6543 if (!p->sysctl_header)
6105e293 6544 goto free;
f68635e6 6545
29c994e3
ND		 6546 if (!strcmp(dev_name, "all"))
6547 ifindex = NETCONFA_IFINDEX_ALL;
6548 else if (!strcmp(dev_name, "default"))
6549 ifindex = NETCONFA_IFINDEX_DEFAULT;
6550 else
6551 ifindex = idev->dev->ifindex;
85b3daad
DA		 6552 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6553 ifindex, p);
95897312 6554 return 0;
1da177e4 6555
f68635e6 6556free:
607ea7cd 6557 kfree(table);
f68635e6 6558out:
95897312 6559 return -ENOBUFS;
1da177e4
LT		 6560}
6561
23452170
DA		 6562static void __addrconf_sysctl_unregister(struct net *net,
6563 struct ipv6_devconf *p, int ifindex)
408c4768 6564{
607ea7cd 6565 struct ctl_table *table;
408c4768 6566
607ea7cd 6567 if (!p->sysctl_header)
408c4768
PE		 6568 return;
6569
607ea7cd
KK		 6570 table = p->sysctl_header->ctl_table_arg;
6571 unregister_net_sysctl_table(p->sysctl_header);
6572 p->sysctl_header = NULL;
6573 kfree(table);
23452170
DA		 6574
6575 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
408c4768
PE		 6576}
6577
a317a2f1 6578static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 6579{
a317a2f1
WC		 6580 int err;
6581
6582 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6583 return -EINVAL;
6584
6585 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6586 &ndisc_ifinfo_sysctl_change);
6587 if (err)
6588 return err;
6589 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6590 idev, &idev->cnf);
6591 if (err)
6592 neigh_sysctl_unregister(idev->nd_parms);
6593
6594 return err;
f52295a9
PE		 6595}
6596
408c4768 6597static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 6598{
23452170
DA		 6599 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6600 idev->dev->ifindex);
408c4768 6601 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 6602}
6603
6604
6605#endif
6606
2c8c1e72 6607static int __net_init addrconf_init_net(struct net *net)
e0da5a48 6608{
a79ca223 6609 int err = -ENOMEM;
e0da5a48
PE		 6610 struct ipv6_devconf *all, *dflt;
6611
a79ca223 6612 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 6613 if (!all)
a79ca223 6614 goto err_alloc_all;
e0da5a48 6615
a79ca223 6616 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 6617 if (!dflt)
a79ca223 6618 goto err_alloc_dflt;
e0da5a48 6619
a79ca223
HZ		 6620 /* these will be inherited by all namespaces */
6621 dflt->autoconf = ipv6_defaults.autoconf;
6622 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 6623
3d1bec99
HFS		 6624 dflt->stable_secret.initialized = false;
6625 all->stable_secret.initialized = false;
6626
e0da5a48
PE		 6627 net->ipv6.devconf_all = all;
6628 net->ipv6.devconf_dflt = dflt;
6629
6630#ifdef CONFIG_SYSCTL
f8572d8f 6631 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 6632 if (err < 0)
6633 goto err_reg_all;
6634
f8572d8f 6635 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 6636 if (err < 0)
6637 goto err_reg_dflt;
6638#endif
6639 return 0;
6640
6641#ifdef CONFIG_SYSCTL
6642err_reg_dflt:
23452170 6643 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
e0da5a48
PE		 6644err_reg_all:
6645 kfree(dflt);
6646#endif
6647err_alloc_dflt:
6648 kfree(all);
6649err_alloc_all:
6650 return err;
6651}
6652
2c8c1e72 6653static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 6654{
6655#ifdef CONFIG_SYSCTL
23452170
DA		 6656 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6657 NETCONFA_IFINDEX_DEFAULT);
6658 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6659 NETCONFA_IFINDEX_ALL);
e0da5a48 6660#endif
73cf0e92 6661 kfree(net->ipv6.devconf_dflt);
6662 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 6663}
6664
6665static struct pernet_operations addrconf_ops = {
6666 .init = addrconf_init_net,
6667 .exit = addrconf_exit_net,
6668};
6669
207895fd 6670static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 6671 .family = AF_INET6,
6672 .fill_link_af = inet6_fill_link_af,
6673 .get_link_af_size = inet6_get_link_af_size,
11b1f828 6674 .validate_link_af = inet6_validate_link_af,
f53adae4 6675 .set_link_af = inet6_set_link_af,
b382b191
TG		 6676};
6677
1da177e4
LT		 6678/*
6679 * Init / cleanup code
6680 */
6681
6682int __init addrconf_init(void)
6683{
a317a2f1 6684 struct inet6_dev *idev;
c2e21293 6685 int i, err;
2a8cc6c8 6686
e21e8467
SH		 6687 err = ipv6_addr_label_init();
6688 if (err < 0) {
f3213831
JP		 6689 pr_crit("%s: cannot initialize default policy table: %d\n",
6690 __func__, err);
2cc6d2bf 6691 goto out;
2a8cc6c8 6692 }
1da177e4 6693
2cc6d2bf
NH		 6694 err = register_pernet_subsys(&addrconf_ops);
6695 if (err < 0)
6696 goto out_addrlabel;
e0da5a48 6697
c15b1cca
HFS		 6698 addrconf_wq = create_workqueue("ipv6_addrconf");
6699 if (!addrconf_wq) {
6700 err = -ENOMEM;
6701 goto out_nowq;
6702 }
6703
1da177e4
LT		 6704 /* The addrconf netdev notifier requires that loopback_dev
6705 * has it's ipv6 private information allocated and setup
6706 * before it can bring up and give link-local addresses
6707 * to other devices which are up.
6708 *
6709 * Unfortunately, loopback_dev is not necessarily the first
6710 * entry in the global dev_base list of net devices. In fact,
6711 * it is likely to be the very last entry on that list.
6712 * So this causes the notifier registry below to try and
6713 * give link-local addresses to all devices besides loopback_dev
6714 * first, then loopback_dev, which cases all the non-loopback_dev
6715 * devices to fail to get a link-local address.
6716 *
6717 * So, as a temporary fix, allocate the ipv6 structure for
6718 * loopback_dev first by hand.
6719 * Longer term, all of the dependencies ipv6 has upon the loopback
6720 * device and it being up should be removed.
6721 */
6722 rtnl_lock();
a317a2f1 6723 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 6724 rtnl_unlock();
a317a2f1
WC		 6725 if (IS_ERR(idev)) {
6726 err = PTR_ERR(idev);
e0da5a48 6727 goto errlo;
a317a2f1 6728 }
1da177e4 6729
2f460933
WC		 6730 ip6_route_init_special_entries();
6731
c2e21293 6732 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6733 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6734
1da177e4
LT		 6735 register_netdevice_notifier(&ipv6_dev_notf);
6736
c15b1cca 6737 addrconf_verify();
c127ea2c 6738
3678a9d8 6739 rtnl_af_register(&inet6_ops);
b382b191 6740
16feebcf
FW		 6741 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
6742 NULL, inet6_dump_ifinfo, 0);
c127ea2c
TG		 6743 if (err < 0)
6744 goto errout;
6745
16feebcf
FW		 6746 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
6747 inet6_rtm_newaddr, NULL, 0);
6748 if (err < 0)
6749 goto errout;
6750 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
6751 inet6_rtm_deladdr, NULL, 0);
6752 if (err < 0)
6753 goto errout;
6754 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
6755 inet6_rtm_getaddr, inet6_dump_ifaddr,
6756 RTNL_FLAG_DOIT_UNLOCKED);
6757 if (err < 0)
6758 goto errout;
6759 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
6760 NULL, inet6_dump_ifmcaddr, 0);
6761 if (err < 0)
6762 goto errout;
6763 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
6764 NULL, inet6_dump_ifacaddr, 0);
6765 if (err < 0)
6766 goto errout;
6767 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
6768 inet6_netconf_get_devconf,
6769 inet6_netconf_dump_devconf,
6770 RTNL_FLAG_DOIT_UNLOCKED);
6771 if (err < 0)
6772 goto errout;
a3fde2ad
FW		 6773 err = ipv6_addr_label_rtnl_register();
6774 if (err < 0)
6775 goto errout;
2a8cc6c8 6776
1da177e4 6777 return 0;
c127ea2c 6778errout:
16feebcf 6779 rtnl_unregister_all(PF_INET6);
b382b191 6780 rtnl_af_unregister(&inet6_ops);
c127ea2c 6781 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6782errlo:
c15b1cca
HFS		 6783 destroy_workqueue(addrconf_wq);
6784out_nowq:
e0da5a48 6785 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 6786out_addrlabel:
6787 ipv6_addr_label_cleanup();
6788out:
c127ea2c 6789 return err;
1da177e4
LT		 6790}
6791
09f7709f 6792void addrconf_cleanup(void)
1da177e4 6793{
176c39af 6794 struct net_device *dev;
1da177e4
LT		 6795 int i;
6796
6797 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6798 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 6799 ipv6_addr_label_cleanup();
1da177e4 6800
5c45121d 6801 rtnl_af_unregister(&inet6_ops);
1da177e4 6802
5c45121d 6803 rtnl_lock();
b382b191 6804
176c39af
DL		 6805 /* clean dev list */
6806 for_each_netdev(&init_net, dev) {
6807 if (__in6_dev_get(dev) == NULL)
6808 continue;
6809 addrconf_ifdown(dev, 1);
6810 }
6811 addrconf_ifdown(init_net.loopback_dev, 2);
6812
1da177e4
LT		 6813 /*
6814 * Check hash table.
6815 */
5c578aed 6816 spin_lock_bh(&addrconf_hash_lock);
c2e21293 6817 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6818 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 6819 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 6820 cancel_delayed_work(&addr_chk_work);
1da177e4 6821 rtnl_unlock();
c15b1cca
HFS		 6822
6823 destroy_workqueue(addrconf_wq);
1da177e4 6824}
Linux 6.x block layer and io_uring tree(s)