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Merge tag 'socfpga_updates_for_v4.20_part3' of git://git.kernel.org/pub/scm/linux...
[mirror_ubuntu-focal-kernel.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
322f74a4 389 ndev->cnf.mtu6 = dev->mtu;
322f74a4 390 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
63159f29 391 if (!ndev->nd_parms) {
322f74a4 392 kfree(ndev);
a317a2f1 393 return ERR_PTR(err);
322f74a4 394 }
0187bdfb
BH		 395 if (ndev->cnf.forwarding)
396 dev_disable_lro(dev);
322f74a4
IO		 397 /* We refer to the device */
398 dev_hold(dev);
1da177e4 399
322f74a4 400 if (snmp6_alloc_dev(ndev) < 0) {
e32ac250
JP		 401 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
402 __func__);
322f74a4 403 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 404 dev_put(dev);
405 kfree(ndev);
a317a2f1 406 return ERR_PTR(err);
322f74a4 407 }
1da177e4 408
322f74a4 409 if (snmp6_register_dev(ndev) < 0) {
e32ac250
JP		 410 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
411 __func__, dev->name);
a317a2f1 412 goto err_release;
322f74a4
IO		 413 }
414
9d6280da 415 /* One reference from device. */
1be92460 416 refcount_set(&ndev->refcnt, 1);
1da177e4 417
1b34be74
YH		 418 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
419 ndev->cnf.accept_dad = -1;
420
07a93626 421#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 422 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 423 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 424 ndev->cnf.rtr_solicits = 0;
425 }
426#endif
427
372e6c8f 428 INIT_LIST_HEAD(&ndev->tempaddr_list);
76506a98 429 ndev->desync_factor = U32_MAX;
322f74a4
IO		 430 if ((dev->flags&IFF_LOOPBACK) ||
431 dev->type == ARPHRD_TUNNEL ||
9625ed72 432 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 433 dev->type == ARPHRD_SIT ||
0be669bb 434 dev->type == ARPHRD_NONE) {
322f74a4 435 ndev->cnf.use_tempaddr = -1;
9d6280da
JB		 436 } else
437 ipv6_regen_rndid(ndev);
5d9efa7e 438
914faa14 439 ndev->token = in6addr_any;
1da177e4 440
1f372c7b 441 if (netif_running(dev) && addrconf_link_ready(dev))
53aadcc9
HX		 442 ndev->if_flags |= IF_READY;
443
322f74a4
IO		 444 ipv6_mc_init_dev(ndev);
445 ndev->tstamp = jiffies;
a317a2f1
WC		 446 err = addrconf_sysctl_register(ndev);
447 if (err) {
448 ipv6_mc_destroy_dev(ndev);
2a189f9e 449 snmp6_unregister_dev(ndev);
a317a2f1
WC		 450 goto err_release;
451 }
30c4cf57 452 /* protected by rtnl_lock */
cf778b00 453 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 454
2c5e8933
HFS		 455 /* Join interface-local all-node multicast group */
456 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
457
d88ae4cc 458 /* Join all-node multicast group */
f3ee4010 459 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 460
d6ddef9e 461 /* Join all-router multicast group if forwarding is set */
8b2aaede 462 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 463 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
464
1da177e4 465 return ndev;
a317a2f1
WC		 466
467err_release:
468 neigh_parms_release(&nd_tbl, ndev->nd_parms);
469 ndev->dead = 1;
470 in6_dev_finish_destroy(ndev);
471 return ERR_PTR(err);
1da177e4
LT		 472}
473
8e5e8f30 474static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 475{
476 struct inet6_dev *idev;
477
478 ASSERT_RTNL();
479
e21e8467
SH		 480 idev = __in6_dev_get(dev);
481 if (!idev) {
482 idev = ipv6_add_dev(dev);
a317a2f1 483 if (IS_ERR(idev))
1da177e4
LT		 484 return NULL;
485 }
c5e33bdd 486
1da177e4
LT		 487 if (dev->flags&IFF_UP)
488 ipv6_mc_up(idev);
489 return idev;
490}
491
f3a1bfb1
ND		 492static int inet6_netconf_msgsize_devconf(int type)
493{
494 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
495 + nla_total_size(4); /* NETCONFA_IFINDEX */
136ba622 496 bool all = false;
f3a1bfb1 497
136ba622
ZS		 498 if (type == NETCONFA_ALL)
499 all = true;
500
501 if (all || type == NETCONFA_FORWARDING)
f3a1bfb1 502 size += nla_total_size(4);
b1afce95 503#ifdef CONFIG_IPV6_MROUTE
136ba622 504 if (all || type == NETCONFA_MC_FORWARDING)
d67b8c61 505 size += nla_total_size(4);
b1afce95 506#endif
136ba622 507 if (all || type == NETCONFA_PROXY_NEIGH)
c92d5491 508 size += nla_total_size(4);
f3a1bfb1 509
136ba622 510 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
35103d11
AG		 511 size += nla_total_size(4);
512
f3a1bfb1
ND		 513 return size;
514}
515
516static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
517 struct ipv6_devconf *devconf, u32 portid,
518 u32 seq, int event, unsigned int flags,
519 int type)
520{
521 struct nlmsghdr *nlh;
522 struct netconfmsg *ncm;
136ba622 523 bool all = false;
f3a1bfb1
ND		 524
525 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
526 flags);
63159f29 527 if (!nlh)
f3a1bfb1
ND		 528 return -EMSGSIZE;
529
136ba622
ZS		 530 if (type == NETCONFA_ALL)
531 all = true;
532
f3a1bfb1
ND		 533 ncm = nlmsg_data(nlh);
534 ncm->ncm_family = AF_INET6;
535
536 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
537 goto nla_put_failure;
538
23452170
DA		 539 if (!devconf)
540 goto out;
541
136ba622 542 if ((all || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 543 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
544 goto nla_put_failure;
b1afce95 545#ifdef CONFIG_IPV6_MROUTE
136ba622 546 if ((all || type == NETCONFA_MC_FORWARDING) &&
d67b8c61
ND		 547 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
548 devconf->mc_forwarding) < 0)
549 goto nla_put_failure;
b1afce95 550#endif
136ba622 551 if ((all || type == NETCONFA_PROXY_NEIGH) &&
c92d5491 552 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
553 goto nla_put_failure;
554
136ba622 555 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
35103d11
AG		 556 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
557 devconf->ignore_routes_with_linkdown) < 0)
558 goto nla_put_failure;
559
23452170 560out:
053c095a
JB		 561 nlmsg_end(skb, nlh);
562 return 0;
f3a1bfb1
ND		 563
564nla_put_failure:
565 nlmsg_cancel(skb, nlh);
566 return -EMSGSIZE;
567}
568
85b3daad
DA		 569void inet6_netconf_notify_devconf(struct net *net, int event, int type,
570 int ifindex, struct ipv6_devconf *devconf)
f3a1bfb1
ND		 571{
572 struct sk_buff *skb;
573 int err = -ENOBUFS;
574
927265bc 575 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
63159f29 576 if (!skb)
f3a1bfb1
ND		 577 goto errout;
578
579 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
85b3daad 580 event, 0, type);
f3a1bfb1
ND		 581 if (err < 0) {
582 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
583 WARN_ON(err == -EMSGSIZE);
584 kfree_skb(skb);
585 goto errout;
586 }
927265bc 587 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
f3a1bfb1
ND		 588 return;
589errout:
bd779028 590 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 591}
592
76f8f6cb
ND		 593static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
594 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
595 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 596 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
35103d11 597 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
76f8f6cb
ND		 598};
599
600static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
c21ef3e3
DA		 601 struct nlmsghdr *nlh,
602 struct netlink_ext_ack *extack)
76f8f6cb
ND		 603{
604 struct net *net = sock_net(in_skb->sk);
605 struct nlattr *tb[NETCONFA_MAX+1];
4ea2607f
FW		 606 struct inet6_dev *in6_dev = NULL;
607 struct net_device *dev = NULL;
76f8f6cb
ND		 608 struct netconfmsg *ncm;
609 struct sk_buff *skb;
610 struct ipv6_devconf *devconf;
76f8f6cb
ND		 611 int ifindex;
612 int err;
613
614 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
c21ef3e3 615 devconf_ipv6_policy, extack);
76f8f6cb 616 if (err < 0)
4ea2607f 617 return err;
76f8f6cb 618
76f8f6cb 619 if (!tb[NETCONFA_IFINDEX])
4ea2607f 620 return -EINVAL;
76f8f6cb 621
4ea2607f 622 err = -EINVAL;
76f8f6cb
ND		 623 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
624 switch (ifindex) {
625 case NETCONFA_IFINDEX_ALL:
626 devconf = net->ipv6.devconf_all;
627 break;
628 case NETCONFA_IFINDEX_DEFAULT:
629 devconf = net->ipv6.devconf_dflt;
630 break;
631 default:
4ea2607f 632 dev = dev_get_by_index(net, ifindex);
63159f29 633 if (!dev)
4ea2607f
FW		 634 return -EINVAL;
635 in6_dev = in6_dev_get(dev);
63159f29 636 if (!in6_dev)
76f8f6cb
ND		 637 goto errout;
638 devconf = &in6_dev->cnf;
639 break;
640 }
641
642 err = -ENOBUFS;
4ea2607f 643 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
63159f29 644 if (!skb)
76f8f6cb
ND		 645 goto errout;
646
647 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
648 NETLINK_CB(in_skb).portid,
649 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
136ba622 650 NETCONFA_ALL);
76f8f6cb
ND		 651 if (err < 0) {
652 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
653 WARN_ON(err == -EMSGSIZE);
654 kfree_skb(skb);
655 goto errout;
656 }
657 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
658errout:
4ea2607f
FW		 659 if (in6_dev)
660 in6_dev_put(in6_dev);
661 if (dev)
662 dev_put(dev);
76f8f6cb
ND		 663 return err;
664}
665
7a674200
ND		 666static int inet6_netconf_dump_devconf(struct sk_buff *skb,
667 struct netlink_callback *cb)
668{
669 struct net *net = sock_net(skb->sk);
670 int h, s_h;
671 int idx, s_idx;
672 struct net_device *dev;
673 struct inet6_dev *idev;
674 struct hlist_head *head;
675
676 s_h = cb->args[0];
677 s_idx = idx = cb->args[1];
678
679 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
680 idx = 0;
681 head = &net->dev_index_head[h];
682 rcu_read_lock();
63998ac2
ND		 683 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
684 net->dev_base_seq;
7a674200
ND		 685 hlist_for_each_entry_rcu(dev, head, index_hlist) {
686 if (idx < s_idx)
687 goto cont;
688 idev = __in6_dev_get(dev);
689 if (!idev)
690 goto cont;
691
692 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
693 &idev->cnf,
694 NETLINK_CB(cb->skb).portid,
695 cb->nlh->nlmsg_seq,
696 RTM_NEWNETCONF,
697 NLM_F_MULTI,
136ba622 698 NETCONFA_ALL) < 0) {
7a674200
ND		 699 rcu_read_unlock();
700 goto done;
701 }
63998ac2 702 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 703cont:
704 idx++;
705 }
706 rcu_read_unlock();
707 }
708 if (h == NETDEV_HASHENTRIES) {
709 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
710 net->ipv6.devconf_all,
711 NETLINK_CB(cb->skb).portid,
712 cb->nlh->nlmsg_seq,
713 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 714 NETCONFA_ALL) < 0)
7a674200
ND		 715 goto done;
716 else
717 h++;
718 }
719 if (h == NETDEV_HASHENTRIES + 1) {
720 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
721 net->ipv6.devconf_dflt,
722 NETLINK_CB(cb->skb).portid,
723 cb->nlh->nlmsg_seq,
724 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 725 NETCONFA_ALL) < 0)
7a674200
ND		 726 goto done;
727 else
728 h++;
729 }
730done:
731 cb->args[0] = h;
732 cb->args[1] = idx;
733
734 return skb->len;
735}
736
1da177e4
LT		 737#ifdef CONFIG_SYSCTL
738static void dev_forward_change(struct inet6_dev *idev)
739{
740 struct net_device *dev;
741 struct inet6_ifaddr *ifa;
1da177e4
LT		 742
743 if (!idev)
744 return;
745 dev = idev->dev;
0187bdfb
BH		 746 if (idev->cnf.forwarding)
747 dev_disable_lro(dev);
1a940835 748 if (dev->flags & IFF_MULTICAST) {
2c5e8933 749 if (idev->cnf.forwarding) {
f3ee4010 750 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 751 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
752 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
753 } else {
f3ee4010 754 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 755 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
756 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
757 }
1da177e4 758 }
502a2ffd 759
760 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 761 if (ifa->flags&IFA_F_TENTATIVE)
762 continue;
1da177e4
LT		 763 if (idev->cnf.forwarding)
764 addrconf_join_anycast(ifa);
765 else
766 addrconf_leave_anycast(ifa);
767 }
85b3daad
DA		 768 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
769 NETCONFA_FORWARDING,
f3a1bfb1 770 dev->ifindex, &idev->cnf);
1da177e4
LT		 771}
772
773
e186932b 774static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 775{
776 struct net_device *dev;
777 struct inet6_dev *idev;
778
4acd4945 779 for_each_netdev(net, dev) {
1da177e4
LT		 780 idev = __in6_dev_get(dev);
781 if (idev) {
e186932b
PE		 782 int changed = (!idev->cnf.forwarding) ^ (!newf);
783 idev->cnf.forwarding = newf;
1da177e4
LT		 784 if (changed)
785 dev_forward_change(idev);
786 }
1da177e4 787 }
1da177e4 788}
c8fecf22 789
013d97e9 790static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 791{
bff16c2f 792 struct net *net;
013d97e9
FR		 793 int old;
794
795 if (!rtnl_trylock())
796 return restart_syscall();
bff16c2f
PE		 797
798 net = (struct net *)table->extra2;
013d97e9
FR		 799 old = *p;
800 *p = newf;
b325fddb 801
013d97e9 802 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1 803 if ((!newf) ^ (!old))
85b3daad
DA		 804 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
805 NETCONFA_FORWARDING,
f3a1bfb1
ND		 806 NETCONFA_IFINDEX_DEFAULT,
807 net->ipv6.devconf_dflt);
013d97e9
FR		 808 rtnl_unlock();
809 return 0;
88af182e 810 }
c8fecf22 811
e186932b 812 if (p == &net->ipv6.devconf_all->forwarding) {
d26c638c
ND		 813 int old_dflt = net->ipv6.devconf_dflt->forwarding;
814
e186932b 815 net->ipv6.devconf_dflt->forwarding = newf;
d26c638c 816 if ((!newf) ^ (!old_dflt))
85b3daad
DA		 817 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
818 NETCONFA_FORWARDING,
d26c638c
ND		 819 NETCONFA_IFINDEX_DEFAULT,
820 net->ipv6.devconf_dflt);
821
e186932b 822 addrconf_forward_change(net, newf);
f3a1bfb1 823 if ((!newf) ^ (!old))
85b3daad
DA		 824 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
825 NETCONFA_FORWARDING,
f3a1bfb1
ND		 826 NETCONFA_IFINDEX_ALL,
827 net->ipv6.devconf_all);
013d97e9 828 } else if ((!newf) ^ (!old))
c8fecf22 829 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 830 rtnl_unlock();
c8fecf22 831
013d97e9 832 if (newf)
7b4da532 833 rt6_purge_dflt_routers(net);
b325fddb 834 return 1;
c8fecf22 835}
35103d11
AG		 836
837static void addrconf_linkdown_change(struct net *net, __s32 newf)
838{
839 struct net_device *dev;
840 struct inet6_dev *idev;
841
842 for_each_netdev(net, dev) {
843 idev = __in6_dev_get(dev);
844 if (idev) {
845 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
846
847 idev->cnf.ignore_routes_with_linkdown = newf;
848 if (changed)
849 inet6_netconf_notify_devconf(dev_net(dev),
85b3daad 850 RTM_NEWNETCONF,
35103d11
AG		 851 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
852 dev->ifindex,
853 &idev->cnf);
854 }
855 }
856}
857
858static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
859{
860 struct net *net;
861 int old;
862
863 if (!rtnl_trylock())
864 return restart_syscall();
865
866 net = (struct net *)table->extra2;
867 old = *p;
868 *p = newf;
869
870 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
871 if ((!newf) ^ (!old))
872 inet6_netconf_notify_devconf(net,
85b3daad 873 RTM_NEWNETCONF,
35103d11
AG		 874 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
875 NETCONFA_IFINDEX_DEFAULT,
876 net->ipv6.devconf_dflt);
877 rtnl_unlock();
878 return 0;
879 }
880
881 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
882 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
883 addrconf_linkdown_change(net, newf);
884 if ((!newf) ^ (!old))
885 inet6_netconf_notify_devconf(net,
85b3daad 886 RTM_NEWNETCONF,
35103d11
AG		 887 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
888 NETCONFA_IFINDEX_ALL,
889 net->ipv6.devconf_all);
890 }
891 rtnl_unlock();
892
893 return 1;
894}
895
1da177e4
LT		 896#endif
897
5c578aed 898/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 899void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
900{
c2e21293 901 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 902
1da177e4 903#ifdef NET_REFCNT_DEBUG
91df42be 904 pr_debug("%s\n", __func__);
1da177e4
LT		 905#endif
906
907 in6_dev_put(ifp->idev);
908
c15b1cca
HFS		 909 if (cancel_delayed_work(&ifp->dad_work))
910 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
911 ifp);
1da177e4 912
e9d3e084 913 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 914 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 915 return;
916 }
1da177e4 917
e5785985 918 kfree_rcu(ifp, rcu);
1da177e4
LT		 919}
920
e55ffac6
BH		 921static void
922ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
923{
502a2ffd 924 struct list_head *p;
8a6ce0c0 925 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 926
927 /*
928 * Each device address list is sorted in order of scope -
929 * global before linklocal.
930 */
502a2ffd 931 list_for_each(p, &idev->addr_list) {
932 struct inet6_ifaddr *ifa
933 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 934 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 935 break;
936 }
937
8ef802aa 938 list_add_tail_rcu(&ifp->if_list, p);
e55ffac6
BH		 939}
940
3f27fb23 941static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
3eb84f49 942{
3f27fb23
ED		 943 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
944
945 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 946}
947
56fc709b 948static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
752a9292 949 struct net_device *dev, unsigned int hash)
56fc709b 950{
56fc709b
ED		 951 struct inet6_ifaddr *ifp;
952
953 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
954 if (!net_eq(dev_net(ifp->idev->dev), net))
955 continue;
956 if (ipv6_addr_equal(&ifp->addr, addr)) {
957 if (!dev || ifp->idev->dev == dev)
958 return true;
959 }
960 }
961 return false;
962}
963
f3d9832e
DA		 964static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
965{
3f27fb23 966 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
f3d9832e
DA		 967 int err = 0;
968
969 spin_lock(&addrconf_hash_lock);
970
971 /* Ignore adding duplicate addresses on an interface */
752a9292 972 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
e32ac250 973 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
f3d9832e 974 err = -EEXIST;
752a9292
ED		 975 } else {
976 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
f3d9832e
DA		 977 }
978
f3d9832e
DA		 979 spin_unlock(&addrconf_hash_lock);
980
981 return err;
982}
983
1da177e4
LT		 984/* On success it returns ifp with increased reference count */
985
986static struct inet6_ifaddr *
e6464b8c 987ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
de95e047 988 bool can_block, struct netlink_ext_ack *extack)
1da177e4 989{
f3d9832e 990 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
e6464b8c 991 int addr_type = ipv6_addr_type(cfg->pfx);
df789fe7 992 struct net *net = dev_net(idev->dev);
1da177e4 993 struct inet6_ifaddr *ifa = NULL;
360a9887 994 struct fib6_info *f6i = NULL;
1da177e4 995 int err = 0;
d68b8270
YH		 996
997 if (addr_type == IPV6_ADDR_ANY ||
998 addr_type & IPV6_ADDR_MULTICAST ||
999 (!(idev->dev->flags & IFF_LOOPBACK) &&
1000 addr_type & IPV6_ADDR_LOOPBACK))
1001 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 1002
1da177e4
LT		 1003 if (idev->dead) {
1004 err = -ENODEV; /*XXX*/
f3d9832e 1005 goto out;
1da177e4
LT		 1006 }
1007
56d417b1 1008 if (idev->cnf.disable_ipv6) {
9bdd8d40 1009 err = -EACCES;
f3d9832e 1010 goto out;
9bdd8d40
BH		 1011 }
1012
ff7883ea
DA		 1013 /* validator notifier needs to be blocking;
1014 * do not call in atomic context
1015 */
1016 if (can_block) {
1017 struct in6_validator_info i6vi = {
e6464b8c 1018 .i6vi_addr = *cfg->pfx,
ff7883ea 1019 .i6vi_dev = idev,
de95e047 1020 .extack = extack,
ff7883ea
DA		 1021 };
1022
1023 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1024 err = notifier_to_errno(err);
1025 if (err < 0)
1026 goto out;
1027 }
1da177e4 1028
f3d9832e 1029 ifa = kzalloc(sizeof(*ifa), gfp_flags);
63159f29 1030 if (!ifa) {
1da177e4
LT		 1031 err = -ENOBUFS;
1032 goto out;
1033 }
1034
e6464b8c 1035 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
360a9887
DA		 1036 if (IS_ERR(f6i)) {
1037 err = PTR_ERR(f6i);
1038 f6i = NULL;
1da177e4
LT		 1039 goto out;
1040 }
1041
df789fe7
DF		 1042 if (net->ipv6.devconf_all->disable_policy ||
1043 idev->cnf.disable_policy)
360a9887 1044 f6i->dst_nopolicy = true;
df789fe7 1045
bba24896
JP		 1046 neigh_parms_data_state_setall(idev->nd_parms);
1047
e6464b8c
DA		 1048 ifa->addr = *cfg->pfx;
1049 if (cfg->peer_pfx)
1050 ifa->peer_addr = *cfg->peer_pfx;
1da177e4
LT		 1051
1052 spin_lock_init(&ifa->lock);
c15b1cca 1053 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 1054 INIT_HLIST_NODE(&ifa->addr_lst);
e6464b8c
DA		 1055 ifa->scope = cfg->scope;
1056 ifa->prefix_len = cfg->plen;
8308f3ff 1057 ifa->rt_priority = cfg->rt_priority;
e6464b8c 1058 ifa->flags = cfg->ifa_flags;
66eb9f86 1059 /* No need to add the TENTATIVE flag for addresses with NODAD */
e6464b8c 1060 if (!(cfg->ifa_flags & IFA_F_NODAD))
66eb9f86 1061 ifa->flags |= IFA_F_TENTATIVE;
e6464b8c
DA		 1062 ifa->valid_lft = cfg->valid_lft;
1063 ifa->prefered_lft = cfg->preferred_lft;
1da177e4 1064 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 1065 ifa->tokenized = false;
1da177e4 1066
360a9887 1067 ifa->rt = f6i;
57f5f544 1068
1da177e4 1069 ifa->idev = idev;
f3d9832e
DA		 1070 in6_dev_hold(idev);
1071
1da177e4 1072 /* For caller */
271201c0 1073 refcount_set(&ifa->refcnt, 1);
1da177e4 1074
f3d9832e 1075 rcu_read_lock_bh();
1da177e4 1076
f3d9832e
DA		 1077 err = ipv6_add_addr_hash(idev->dev, ifa);
1078 if (err < 0) {
1079 rcu_read_unlock_bh();
1080 goto out;
1081 }
1da177e4
LT		 1082
1083 write_lock(&idev->lock);
f3d9832e 1084
1da177e4 1085 /* Add to inet6_dev unicast addr list. */
e55ffac6 1086 ipv6_link_dev_addr(idev, ifa);
1da177e4 1087
1da177e4 1088 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 1089 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 1090 in6_ifa_hold(ifa);
1091 }
1da177e4 1092
1da177e4
LT		 1093 in6_ifa_hold(ifa);
1094 write_unlock(&idev->lock);
f3d9832e 1095
8814c4b5 1096 rcu_read_unlock_bh();
1da177e4 1097
f3d9832e
DA		 1098 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1099out:
1100 if (unlikely(err < 0)) {
360a9887 1101 fib6_info_release(f6i);
93531c67 1102
f3d9832e
DA		 1103 if (ifa) {
1104 if (ifa->idev)
1105 in6_dev_put(ifa->idev);
1106 kfree(ifa);
1107 }
1da177e4
LT		 1108 ifa = ERR_PTR(err);
1109 }
1110
1111 return ifa;
1da177e4
LT		 1112}
1113
5b84efec
TH		 1114enum cleanup_prefix_rt_t {
1115 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1116 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1117 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1118};
1119
1120/*
1121 * Check, whether the prefix for ifp would still need a prefix route
1122 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1123 * constants.
1124 *
1125 * 1) we don't purge prefix if address was not permanent.
1126 * prefix is managed by its own lifetime.
1127 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1128 * 3) if there are no addresses, delete prefix.
1129 * 4) if there are still other permanent address(es),
1130 * corresponding prefix is still permanent.
1131 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1132 * don't purge the prefix, assume user space is managing it.
1133 * 6) otherwise, update prefix lifetime to the
1134 * longest valid lifetime among the corresponding
1135 * addresses on the device.
1136 * Note: subsequent RA will update lifetime.
1137 **/
1138static enum cleanup_prefix_rt_t
1139check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1140{
1141 struct inet6_ifaddr *ifa;
1142 struct inet6_dev *idev = ifp->idev;
1143 unsigned long lifetime;
1144 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1145
1146 *expires = jiffies;
1147
1148 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1149 if (ifa == ifp)
1150 continue;
1151 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1152 ifp->prefix_len))
1153 continue;
1154 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1155 return CLEANUP_PREFIX_RT_NOP;
1156
1157 action = CLEANUP_PREFIX_RT_EXPIRE;
1158
1159 spin_lock(&ifa->lock);
1160
1161 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1162 /*
1163 * Note: Because this address is
1164 * not permanent, lifetime <
1165 * LONG_MAX / HZ here.
1166 */
1167 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1168 *expires = ifa->tstamp + lifetime * HZ;
1169 spin_unlock(&ifa->lock);
1170 }
1171
1172 return action;
1173}
1174
1175static void
1176cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1177{
93c2fb25 1178 struct fib6_info *f6i;
5b84efec 1179
93c2fb25 1180 f6i = addrconf_get_prefix_route(&ifp->addr,
5b84efec
TH		 1181 ifp->prefix_len,
1182 ifp->idev->dev,
1183 0, RTF_GATEWAY | RTF_DEFAULT);
93c2fb25 1184 if (f6i) {
5b84efec 1185 if (del_rt)
93c2fb25 1186 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
5b84efec 1187 else {
93c2fb25
DA		 1188 if (!(f6i->fib6_flags & RTF_EXPIRES))
1189 fib6_set_expires(f6i, expires);
1190 fib6_info_release(f6i);
5b84efec
TH		 1191 }
1192 }
1193}
1194
1195
1da177e4
LT		 1196/* This function wants to get referenced ifp and releases it before return */
1197
1198static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1199{
4c5ff6a6 1200 int state;
5b84efec
TH		 1201 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1202 unsigned long expires;
1da177e4 1203
c15b1cca
HFS		 1204 ASSERT_RTNL();
1205
8e8e676d 1206 spin_lock_bh(&ifp->lock);
4c5ff6a6 1207 state = ifp->state;
e9d3e084 1208 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1209 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1210
1211 if (state == INET6_IFADDR_STATE_DEAD)
1212 goto out;
1da177e4 1213
5c578aed 1214 spin_lock_bh(&addrconf_hash_lock);
1215 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1216 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1217
5b84efec 1218 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1219
1da177e4 1220 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1221 list_del(&ifp->tmp_list);
1222 if (ifp->ifpub) {
1223 in6_ifa_put(ifp->ifpub);
1224 ifp->ifpub = NULL;
1da177e4 1225 }
372e6c8f 1226 __in6_ifa_put(ifp);
1da177e4 1227 }
1da177e4 1228
5b84efec
TH		 1229 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1230 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1231
8ef802aa 1232 list_del_rcu(&ifp->if_list);
5b84efec
TH		 1233 __in6_ifa_put(ifp);
1234
1235 write_unlock_bh(&ifp->idev->lock);
1da177e4 1236
c15b1cca 1237 addrconf_del_dad_work(ifp);
b2238566 1238
1da177e4
LT		 1239 ipv6_ifa_notify(RTM_DELADDR, ifp);
1240
f88c91dd 1241 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1242
5b84efec
TH		 1243 if (action != CLEANUP_PREFIX_RT_NOP) {
1244 cleanup_prefix_route(ifp, expires,
1245 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1246 }
1247
c3968a85
DW		 1248 /* clean up prefsrc entries */
1249 rt6_remove_prefsrc(ifp);
4c5ff6a6 1250out:
1da177e4
LT		 1251 in6_ifa_put(ifp);
1252}
1253
fffcefe9
ED		 1254static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp,
1255 struct inet6_ifaddr *ift,
1256 bool block)
1da177e4
LT		 1257{
1258 struct inet6_dev *idev = ifp->idev;
1259 struct in6_addr addr, *tmpaddr;
e6464b8c 1260 unsigned long tmp_tstamp, age;
eac55bf9 1261 unsigned long regen_advance;
e6464b8c 1262 struct ifa6_config cfg;
1da177e4 1263 int ret = 0;
76f793e3 1264 unsigned long now = jiffies;
76506a98 1265 long max_desync_factor;
7aa8e63f 1266 s32 cnf_temp_preferred_lft;
1da177e4 1267
53bd6749 1268 write_lock_bh(&idev->lock);
1da177e4
LT		 1269 if (ift) {
1270 spin_lock_bh(&ift->lock);
1271 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1272 spin_unlock_bh(&ift->lock);
1273 tmpaddr = &addr;
1274 } else {
1275 tmpaddr = NULL;
1276 }
1277retry:
1278 in6_dev_hold(idev);
1279 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1280 write_unlock_bh(&idev->lock);
f3213831 1281 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1282 in6_dev_put(idev);
1283 ret = -1;
1284 goto out;
1285 }
1286 spin_lock_bh(&ifp->lock);
1287 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1288 idev->cnf.use_tempaddr = -1; /*XXX*/
1289 spin_unlock_bh(&ifp->lock);
53bd6749 1290 write_unlock_bh(&idev->lock);
f3213831
JP		 1291 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1292 __func__);
1da177e4
LT		 1293 in6_dev_put(idev);
1294 ret = -1;
1295 goto out;
1296 }
1297 in6_ifa_hold(ifp);
1298 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
9d6280da 1299 ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1300 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1301 age = (now - ifp->tstamp) / HZ;
76506a98
JB		 1302
1303 regen_advance = idev->cnf.regen_max_retry *
1304 idev->cnf.dad_transmits *
1305 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1306
1307 /* recalculate max_desync_factor each time and update
1308 * idev->desync_factor if it's larger
1309 */
7aa8e63f 1310 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
76506a98
JB		 1311 max_desync_factor = min_t(__u32,
1312 idev->cnf.max_desync_factor,
7aa8e63f 1313 cnf_temp_preferred_lft - regen_advance);
76506a98
JB		 1314
1315 if (unlikely(idev->desync_factor > max_desync_factor)) {
1316 if (max_desync_factor > 0) {
1317 get_random_bytes(&idev->desync_factor,
1318 sizeof(idev->desync_factor));
1319 idev->desync_factor %= max_desync_factor;
1320 } else {
1321 idev->desync_factor = 0;
1322 }
1323 }
1324
3f2d67b6 1325 memset(&cfg, 0, sizeof(cfg));
e6464b8c 1326 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
7a876b0e 1327 idev->cnf.temp_valid_lft + age);
e6464b8c
DA		 1328 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1329 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1330
1331 cfg.plen = ifp->prefix_len;
1da177e4
LT		 1332 tmp_tstamp = ifp->tstamp;
1333 spin_unlock_bh(&ifp->lock);
1334
53bd6749 1335 write_unlock_bh(&idev->lock);
95c385b4 1336
eac55bf9
BB		 1337 /* A temporary address is created only if this calculated Preferred
1338 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1339 * an implementation must not create a temporary address with a zero
1340 * Preferred Lifetime.
ecab6701
HK		 1341 * Use age calculation as in addrconf_verify to avoid unnecessary
1342 * temporary addresses being generated.
eac55bf9 1343 */
ecab6701 1344 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
e6464b8c 1345 if (cfg.preferred_lft <= regen_advance + age) {
eac55bf9
BB		 1346 in6_ifa_put(ifp);
1347 in6_dev_put(idev);
1348 ret = -1;
1349 goto out;
1350 }
1351
e6464b8c 1352 cfg.ifa_flags = IFA_F_TEMPORARY;
95c385b4
NH		 1353 /* set in addrconf_prefix_rcv() */
1354 if (ifp->flags & IFA_F_OPTIMISTIC)
e6464b8c 1355 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
95c385b4 1356
e6464b8c
DA		 1357 cfg.pfx = &addr;
1358 cfg.scope = ipv6_addr_scope(cfg.pfx);
95c385b4 1359
e6464b8c 1360 ift = ipv6_add_addr(idev, &cfg, block, NULL);
4b08a8f1 1361 if (IS_ERR(ift)) {
1da177e4
LT		 1362 in6_ifa_put(ifp);
1363 in6_dev_put(idev);
f3213831 1364 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1365 tmpaddr = &addr;
53bd6749 1366 write_lock_bh(&idev->lock);
1da177e4
LT		 1367 goto retry;
1368 }
1369
1370 spin_lock_bh(&ift->lock);
1371 ift->ifpub = ifp;
76f793e3 1372 ift->cstamp = now;
1da177e4
LT		 1373 ift->tstamp = tmp_tstamp;
1374 spin_unlock_bh(&ift->lock);
1375
cf22f9a2 1376 addrconf_dad_start(ift);
1da177e4
LT		 1377 in6_ifa_put(ift);
1378 in6_dev_put(idev);
1379out:
1380 return ret;
1381}
1da177e4
LT		 1382
1383/*
072047e4 1384 * Choose an appropriate source address (RFC3484)
1da177e4 1385 */
a9b05723
YH		 1386enum {
1387 IPV6_SADDR_RULE_INIT = 0,
1388 IPV6_SADDR_RULE_LOCAL,
1389 IPV6_SADDR_RULE_SCOPE,
1390 IPV6_SADDR_RULE_PREFERRED,
1391#ifdef CONFIG_IPV6_MIP6
1392 IPV6_SADDR_RULE_HOA,
1393#endif
1394 IPV6_SADDR_RULE_OIF,
1395 IPV6_SADDR_RULE_LABEL,
a9b05723 1396 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1397 IPV6_SADDR_RULE_ORCHID,
1398 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1399#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1400 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1401#endif
a9b05723
YH		 1402 IPV6_SADDR_RULE_MAX
1403};
1404
072047e4 1405struct ipv6_saddr_score {
a9b05723
YH		 1406 int rule;
1407 int addr_type;
1408 struct inet6_ifaddr *ifa;
1409 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1410 int scopedist;
1411 int matchlen;
072047e4
YH		 1412};
1413
a9b05723 1414struct ipv6_saddr_dst {
9acd9f3a 1415 const struct in6_addr *addr;
a9b05723
YH		 1416 int ifindex;
1417 int scope;
1418 int label;
7cbca67c 1419 unsigned int prefs;
a9b05723 1420};
072047e4 1421
b6f99a21 1422static inline int ipv6_saddr_preferred(int type)
1da177e4 1423{
45bb0060 1424 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1425 return 1;
1426 return 0;
1da177e4
LT		 1427}
1428
35e015e1
MC		 1429static bool ipv6_use_optimistic_addr(struct net *net,
1430 struct inet6_dev *idev)
7fd2561e
EK		 1431{
1432#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 1433 if (!idev)
1434 return false;
1435 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1436 return false;
1437 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1438 return false;
1439
1440 return true;
7fd2561e
EK		 1441#else
1442 return false;
1443#endif
1444}
1445
f1c02cfb
SD		 1446static bool ipv6_allow_optimistic_dad(struct net *net,
1447 struct inet6_dev *idev)
1448{
1449#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1450 if (!idev)
1451 return false;
1452 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1453 return false;
1454
1455 return true;
1456#else
1457 return false;
1458#endif
1459}
1460
3de23255
BT		 1461static int ipv6_get_saddr_eval(struct net *net,
1462 struct ipv6_saddr_score *score,
a9b05723
YH		 1463 struct ipv6_saddr_dst *dst,
1464 int i)
1465{
1466 int ret;
1467
1468 if (i <= score->rule) {
1469 switch (i) {
1470 case IPV6_SADDR_RULE_SCOPE:
1471 ret = score->scopedist;
1472 break;
1473 case IPV6_SADDR_RULE_PREFIX:
1474 ret = score->matchlen;
1475 break;
1476 default:
1477 ret = !!test_bit(i, score->scorebits);
1478 }
1479 goto out;
1480 }
1481
1482 switch (i) {
1483 case IPV6_SADDR_RULE_INIT:
1484 /* Rule 0: remember if hiscore is not ready yet */
1485 ret = !!score->ifa;
1486 break;
1487 case IPV6_SADDR_RULE_LOCAL:
1488 /* Rule 1: Prefer same address */
1489 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1490 break;
1491 case IPV6_SADDR_RULE_SCOPE:
1492 /* Rule 2: Prefer appropriate scope
1493 *
1494 * ret
1495 * ^
1496 * -1 | d 15
1497 * ---+--+-+---> scope
1498 * |
1499 * | d is scope of the destination.
1500 * B-d | \
1501 * | \ <- smaller scope is better if
db9c7c39 1502 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1503 * | ret = B - scope (-1 <= scope >= d <= 15).
1504 * d-C-1 | /
1505 * |/ <- greater is better
1506 * -C / if scope is not enough for destination.
1507 * /| ret = scope - C (-1 <= d < scope <= 15).
1508 *
1509 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1510 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1511 * Assume B = 0 and we get C > 29.
1512 */
1513 ret = __ipv6_addr_src_scope(score->addr_type);
1514 if (ret >= dst->scope)
1515 ret = -ret;
1516 else
1517 ret -= 128; /* 30 is enough */
1518 score->scopedist = ret;
1519 break;
1520 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1521 {
a9b05723 1522 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1523 u8 avoid = IFA_F_DEPRECATED;
1524
35e015e1 1525 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
7fd2561e 1526 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1527 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1528 !(score->ifa->flags & avoid);
a9b05723 1529 break;
7fd2561e 1530 }
a9b05723
YH		 1531#ifdef CONFIG_IPV6_MIP6
1532 case IPV6_SADDR_RULE_HOA:
7cbca67c 1533 {
a9b05723 1534 /* Rule 4: Prefer home address */
7cbca67c
YH		 1535 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1536 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1537 break;
7cbca67c 1538 }
a9b05723
YH		 1539#endif
1540 case IPV6_SADDR_RULE_OIF:
1541 /* Rule 5: Prefer outgoing interface */
1542 ret = (!dst->ifindex ||
1543 dst->ifindex == score->ifa->idev->dev->ifindex);
1544 break;
1545 case IPV6_SADDR_RULE_LABEL:
1546 /* Rule 6: Prefer matching label */
3de23255
BT		 1547 ret = ipv6_addr_label(net,
1548 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1549 score->ifa->idev->dev->ifindex) == dst->label;
1550 break;
a9b05723 1551 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1552 {
a9b05723 1553 /* Rule 7: Prefer public address
25985edc 1554 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1555 */
7cbca67c
YH		 1556 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1557 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1558 score->ifa->idev->cnf.use_tempaddr >= 2;
1559 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1560 break;
7cbca67c 1561 }
a9b05723
YH		 1562 case IPV6_SADDR_RULE_ORCHID:
1563 /* Rule 8-: Prefer ORCHID vs ORCHID or
1564 * non-ORCHID vs non-ORCHID
1565 */
1566 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1567 ipv6_addr_orchid(dst->addr));
1568 break;
1569 case IPV6_SADDR_RULE_PREFIX:
1570 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1571 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1572 if (ret > score->ifa->prefix_len)
1573 ret = score->ifa->prefix_len;
1574 score->matchlen = ret;
a9b05723 1575 break;
7fd2561e
EK		 1576#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1577 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1578 /* Optimistic addresses still have lower precedence than other
1579 * preferred addresses.
1580 */
1581 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1582 break;
1583#endif
a9b05723
YH		 1584 default:
1585 ret = 0;
1586 }
1587
1588 if (ret)
1589 __set_bit(i, score->scorebits);
1590 score->rule = i;
1591out:
1592 return ret;
1593}
1594
c0b8da1e
YH		 1595static int __ipv6_dev_get_saddr(struct net *net,
1596 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1597 struct inet6_dev *idev,
1598 struct ipv6_saddr_score *scores,
1599 int hiscore_idx)
9131f3de 1600{
c0b8da1e 1601 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de 1602
f59c031e 1603 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
9131f3de
YH		 1604 int i;
1605
1606 /*
1607 * - Tentative Address (RFC2462 section 5.4)
1608 * - A tentative address is not considered
1609 * "assigned to an interface" in the traditional
1610 * sense, unless it is also flagged as optimistic.
1611 * - Candidate Source Address (section 4)
1612 * - In any case, anycast addresses, multicast
1613 * addresses, and the unspecified address MUST
1614 * NOT be included in a candidate set.
1615 */
1616 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1617 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1618 continue;
1619
1620 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1621
1622 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1623 score->addr_type & IPV6_ADDR_MULTICAST)) {
1624 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1625 idev->dev->name);
1626 continue;
1627 }
1628
1629 score->rule = -1;
1630 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1631
1632 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1633 int minihiscore, miniscore;
1634
1635 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1636 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1637
1638 if (minihiscore > miniscore) {
1639 if (i == IPV6_SADDR_RULE_SCOPE &&
1640 score->scopedist > 0) {
1641 /*
1642 * special case:
1643 * each remaining entry
1644 * has too small (not enough)
1645 * scope, because ifa entries
1646 * are sorted by their scope
1647 * values.
1648 */
1649 goto out;
1650 }
1651 break;
1652 } else if (minihiscore < miniscore) {
9131f3de 1653 swap(hiscore, score);
c0b8da1e 1654 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1655
1656 /* restore our iterator */
1657 score->ifa = hiscore->ifa;
1658
1659 break;
1660 }
1661 }
1662 }
1663out:
c0b8da1e 1664 return hiscore_idx;
9131f3de
YH		 1665}
1666
afbac601
DA		 1667static int ipv6_get_saddr_master(struct net *net,
1668 const struct net_device *dst_dev,
1669 const struct net_device *master,
1670 struct ipv6_saddr_dst *dst,
1671 struct ipv6_saddr_score *scores,
1672 int hiscore_idx)
1673{
1674 struct inet6_dev *idev;
1675
1676 idev = __in6_dev_get(dst_dev);
1677 if (idev)
1678 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1679 scores, hiscore_idx);
1680
1681 idev = __in6_dev_get(master);
1682 if (idev)
1683 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1684 scores, hiscore_idx);
1685
1686 return hiscore_idx;
1687}
1688
b3f644fc 1689int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1690 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1691 struct in6_addr *saddr)
1da177e4 1692{
c0b8da1e 1693 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1694 struct ipv6_saddr_dst dst;
9131f3de 1695 struct inet6_dev *idev;
072047e4 1696 struct net_device *dev;
a9b05723 1697 int dst_type;
9131f3de 1698 bool use_oif_addr = false;
c0b8da1e 1699 int hiscore_idx = 0;
cc429c8f 1700 int ret = 0;
1da177e4 1701
a9b05723
YH		 1702 dst_type = __ipv6_addr_type(daddr);
1703 dst.addr = daddr;
1704 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1705 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1706 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1707 dst.prefs = prefs;
a9b05723 1708
c0b8da1e
YH		 1709 scores[hiscore_idx].rule = -1;
1710 scores[hiscore_idx].ifa = NULL;
1da177e4 1711
8814c4b5 1712 rcu_read_lock();
1da177e4 1713
9131f3de
YH		 1714 /* Candidate Source Address (section 4)
1715 * - multicast and link-local destination address,
1716 * the set of candidate source address MUST only
1717 * include addresses assigned to interfaces
1718 * belonging to the same link as the outgoing
1719 * interface.
1720 * (- For site-local destination addresses, the
1721 * set of candidate source addresses MUST only
1722 * include addresses assigned to interfaces
1723 * belonging to the same site as the outgoing
1724 * interface.)
3985e8a3
EK		 1725 * - "It is RECOMMENDED that the candidate source addresses
1726 * be the set of unicast addresses assigned to the
1727 * interface that will be used to send to the destination
1728 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1729 */
1730 if (dst_dev) {
3985e8a3 1731 idev = __in6_dev_get(dst_dev);
9131f3de 1732 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1733 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1734 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1735 use_oif_addr = true;
1736 }
1737 }
a9b05723 1738
9131f3de 1739 if (use_oif_addr) {
c0b8da1e 1740 if (idev)
c15df306 1741 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de 1742 } else {
afbac601
DA		 1743 const struct net_device *master;
1744 int master_idx = 0;
1745
1746 /* if dst_dev exists and is enslaved to an L3 device, then
1747 * prefer addresses from dst_dev and then the master over
1748 * any other enslaved devices in the L3 domain.
1749 */
1750 master = l3mdev_master_dev_rcu(dst_dev);
1751 if (master) {
1752 master_idx = master->ifindex;
1753
1754 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1755 master, &dst,
1756 scores, hiscore_idx);
1757
1758 if (scores[hiscore_idx].ifa)
1759 goto out;
1760 }
1761
9131f3de 1762 for_each_netdev_rcu(net, dev) {
afbac601
DA		 1763 /* only consider addresses on devices in the
1764 * same L3 domain
1765 */
1766 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1767 continue;
9131f3de
YH		 1768 idev = __in6_dev_get(dev);
1769 if (!idev)
072047e4 1770 continue;
c15df306 1771 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1772 }
1773 }
afbac601
DA		 1774
1775out:
c0b8da1e 1776 hiscore = &scores[hiscore_idx];
a9b05723 1777 if (!hiscore->ifa)
cc429c8f
ED		 1778 ret = -EADDRNOTAVAIL;
1779 else
1780 *saddr = hiscore->ifa->addr;
1ab1457c 1781
cc429c8f
ED		 1782 rcu_read_unlock();
1783 return ret;
1da177e4 1784}
5e5f3f0f 1785EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1786
8965779d 1787int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1788 u32 banned_flags)
b7b1bfce
HFS		 1789{
1790 struct inet6_ifaddr *ifp;
1791 int err = -EADDRNOTAVAIL;
1792
602582ca
HFS		 1793 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1794 if (ifp->scope > IFA_LINK)
1795 break;
b7b1bfce
HFS		 1796 if (ifp->scope == IFA_LINK &&
1797 !(ifp->flags & banned_flags)) {
1798 *addr = ifp->addr;
1799 err = 0;
1800 break;
1801 }
1802 }
1803 return err;
1804}
1805
95c385b4 1806int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1807 u32 banned_flags)
1da177e4
LT		 1808{
1809 struct inet6_dev *idev;
1810 int err = -EADDRNOTAVAIL;
1811
8814c4b5 1812 rcu_read_lock();
e21e8467
SH		 1813 idev = __in6_dev_get(dev);
1814 if (idev) {
1da177e4 1815 read_lock_bh(&idev->lock);
b7b1bfce 1816 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1817 read_unlock_bh(&idev->lock);
1818 }
8814c4b5 1819 rcu_read_unlock();
1da177e4
LT		 1820 return err;
1821}
1822
d9bf82c2 1823static int ipv6_count_addresses(const struct inet6_dev *idev)
1da177e4 1824{
d9bf82c2 1825 const struct inet6_ifaddr *ifp;
1da177e4 1826 int cnt = 0;
1da177e4 1827
d9bf82c2
ED		 1828 rcu_read_lock();
1829 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1da177e4 1830 cnt++;
d9bf82c2 1831 rcu_read_unlock();
1da177e4
LT		 1832 return cnt;
1833}
1834
b71d1d42 1835int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1836 const struct net_device *dev, int strict)
c58da4c6 1837{
232378e8
DA		 1838 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1839 strict, IFA_F_TENTATIVE);
c58da4c6
EK		 1840}
1841EXPORT_SYMBOL(ipv6_chk_addr);
1842
1893ff20
DA		 1843/* device argument is used to find the L3 domain of interest. If
1844 * skip_dev_check is set, then the ifp device is not checked against
1845 * the passed in dev argument. So the 2 cases for addresses checks are:
1846 * 1. does the address exist in the L3 domain that dev is part of
1847 * (skip_dev_check = true), or
1848 *
1849 * 2. does the address exist on the specific device
1850 * (skip_dev_check = false)
1851 */
c58da4c6 1852int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
232378e8
DA		 1853 const struct net_device *dev, bool skip_dev_check,
1854 int strict, u32 banned_flags)
1da177e4 1855{
3f27fb23 1856 unsigned int hash = inet6_addr_hash(net, addr);
1893ff20 1857 const struct net_device *l3mdev;
eedf042a 1858 struct inet6_ifaddr *ifp;
c58da4c6 1859 u32 ifp_flags;
1da177e4 1860
480318a0 1861 rcu_read_lock();
232378e8 1862
1893ff20 1863 l3mdev = l3mdev_master_dev_rcu(dev);
232378e8
DA		 1864 if (skip_dev_check)
1865 dev = NULL;
1866
b67bfe0d 1867 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1868 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1869 continue;
1893ff20
DA		 1870
1871 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev)
1872 continue;
1873
c58da4c6
EK		 1874 /* Decouple optimistic from tentative for evaluation here.
1875 * Ban optimistic addresses explicitly, when required.
1876 */
1877 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1878 ? (ifp->flags&~IFA_F_TENTATIVE)
1879 : ifp->flags;
1da177e4 1880 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1881 !(ifp_flags&banned_flags) &&
63159f29 1882 (!dev || ifp->idev->dev == dev ||
eedf042a 1883 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
480318a0 1884 rcu_read_unlock();
eedf042a 1885 return 1;
1da177e4
LT		 1886 }
1887 }
5c578aed 1888
480318a0 1889 rcu_read_unlock();
eedf042a 1890 return 0;
1da177e4 1891}
c58da4c6 1892EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1893
1da177e4 1894
7df37ff3
CB		 1895/* Compares an address/prefix_len with addresses on device @dev.
1896 * If one is found it returns true.
1897 */
1898bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1899 const unsigned int prefix_len, struct net_device *dev)
1900{
47e26941
ED		 1901 const struct inet6_ifaddr *ifa;
1902 const struct inet6_dev *idev;
7df37ff3
CB		 1903 bool ret = false;
1904
1905 rcu_read_lock();
1906 idev = __in6_dev_get(dev);
1907 if (idev) {
47e26941 1908 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
7df37ff3
CB		 1909 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1910 if (ret)
1911 break;
1912 }
7df37ff3
CB		 1913 }
1914 rcu_read_unlock();
1915
1916 return ret;
1917}
1918EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1919
b71d1d42 1920int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84 1921{
24ba333b
ED		 1922 const struct inet6_ifaddr *ifa;
1923 const struct inet6_dev *idev;
52eeeb84
YH		 1924 int onlink;
1925
1926 onlink = 0;
1927 rcu_read_lock();
1928 idev = __in6_dev_get(dev);
1929 if (idev) {
24ba333b 1930 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1931 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1932 ifa->prefix_len);
1933 if (onlink)
1934 break;
1935 }
52eeeb84
YH		 1936 }
1937 rcu_read_unlock();
1938 return onlink;
1939}
52eeeb84
YH		 1940EXPORT_SYMBOL(ipv6_chk_prefix);
1941
9acd9f3a 1942struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1943 struct net_device *dev, int strict)
1da177e4 1944{
3f27fb23 1945 unsigned int hash = inet6_addr_hash(net, addr);
b79d1d54 1946 struct inet6_ifaddr *ifp, *result = NULL;
1da177e4 1947
24f226da
ED		 1948 rcu_read_lock();
1949 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1950 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1951 continue;
1da177e4 1952 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1953 if (!dev || ifp->idev->dev == dev ||
1da177e4 1954 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1955 result = ifp;
1da177e4
LT		 1956 in6_ifa_hold(ifp);
1957 break;
1958 }
1959 }
1960 }
24f226da 1961 rcu_read_unlock();
1da177e4 1962
b79d1d54 1963 return result;
1da177e4
LT		 1964}
1965
1da177e4
LT		 1966/* Gets referenced address, destroys ifaddr */
1967
cc411d0b 1968static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1969{
3d171f39
LR		 1970 if (dad_failed)
1971 ifp->flags |= IFA_F_DADFAILED;
1972
ec8add2a 1973 if (ifp->flags&IFA_F_TEMPORARY) {
1da177e4
LT		 1974 struct inet6_ifaddr *ifpub;
1975 spin_lock_bh(&ifp->lock);
1976 ifpub = ifp->ifpub;
1977 if (ifpub) {
1978 in6_ifa_hold(ifpub);
1979 spin_unlock_bh(&ifp->lock);
fffcefe9 1980 ipv6_create_tempaddr(ifpub, ifp, true);
1da177e4
LT		 1981 in6_ifa_put(ifpub);
1982 } else {
1983 spin_unlock_bh(&ifp->lock);
1984 }
1985 ipv6_del_addr(ifp);
ec8add2a
SD		 1986 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
1987 spin_lock_bh(&ifp->lock);
1988 addrconf_del_dad_work(ifp);
1989 ifp->flags |= IFA_F_TENTATIVE;
f1c02cfb
SD		 1990 if (dad_failed)
1991 ifp->flags &= ~IFA_F_OPTIMISTIC;
ec8add2a
SD		 1992 spin_unlock_bh(&ifp->lock);
1993 if (dad_failed)
1994 ipv6_ifa_notify(0, ifp);
1995 in6_ifa_put(ifp);
c15b1cca 1996 } else {
1da177e4 1997 ipv6_del_addr(ifp);
c15b1cca 1998 }
1da177e4
LT		 1999}
2000
f2344a13
HX		 2001static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2002{
2003 int err = -ENOENT;
2004
8e8e676d 2005 spin_lock_bh(&ifp->lock);
f2344a13
HX		 2006 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2007 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2008 err = 0;
2009 }
8e8e676d 2010 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 2011
2012 return err;
2013}
2014
da13c59b 2015void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
3c21edbd 2016{
1b34be74 2017 struct inet6_dev *idev = ifp->idev;
1855b7c3 2018 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 2019
853dc2e0
UB		 2020 if (addrconf_dad_end(ifp)) {
2021 in6_ifa_put(ifp);
f2344a13 2022 return;
853dc2e0 2023 }
f2344a13 2024
da13c59b
VP		 2025 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2026 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
9bdd8d40 2027
5f40ef77
HFS		 2028 spin_lock_bh(&ifp->lock);
2029
2030 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
5f40ef77
HFS		 2031 struct in6_addr new_addr;
2032 struct inet6_ifaddr *ifp2;
5f40ef77 2033 int retries = ifp->stable_privacy_retry + 1;
e6464b8c
DA		 2034 struct ifa6_config cfg = {
2035 .pfx = &new_addr,
2036 .plen = ifp->prefix_len,
2037 .ifa_flags = ifp->flags,
2038 .valid_lft = ifp->valid_lft,
2039 .preferred_lft = ifp->prefered_lft,
2040 .scope = ifp->scope,
2041 };
5f40ef77 2042
1855b7c3 2043 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 2044 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2045 ifp->idev->dev->name);
2046 goto errdad;
2047 }
2048
2049 new_addr = ifp->addr;
2050 if (ipv6_generate_stable_address(&new_addr, retries,
2051 idev))
2052 goto errdad;
2053
5f40ef77 2054 spin_unlock_bh(&ifp->lock);
1b34be74 2055
5f40ef77
HFS		 2056 if (idev->cnf.max_addresses &&
2057 ipv6_count_addresses(idev) >=
2058 idev->cnf.max_addresses)
2059 goto lock_errdad;
2060
2061 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2062 ifp->idev->dev->name);
2063
e6464b8c 2064 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
5f40ef77
HFS		 2065 if (IS_ERR(ifp2))
2066 goto lock_errdad;
2067
2068 spin_lock_bh(&ifp2->lock);
2069 ifp2->stable_privacy_retry = retries;
2070 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2071 spin_unlock_bh(&ifp2->lock);
2072
1855b7c3 2073 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 2074 in6_ifa_put(ifp2);
2075lock_errdad:
2076 spin_lock_bh(&ifp->lock);
1b34be74
YH		 2077 }
2078
5f40ef77 2079errdad:
c15b1cca
HFS		 2080 /* transition from _POSTDAD to _ERRDAD */
2081 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 2082 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 2083
2084 addrconf_mod_dad_work(ifp, 0);
751eb6b6 2085 in6_ifa_put(ifp);
3c21edbd 2086}
1da177e4 2087
a9ed4a29
SD		 2088/* Join to solicited addr multicast group.
2089 * caller must hold RTNL */
b71d1d42 2090void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 2091{
2092 struct in6_addr maddr;
2093
2094 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2095 return;
2096
2097 addrconf_addr_solict_mult(addr, &maddr);
2098 ipv6_dev_mc_inc(dev, &maddr);
2099}
2100
a9ed4a29 2101/* caller must hold RTNL */
b71d1d42 2102void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 2103{
2104 struct in6_addr maddr;
2105
2106 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2107 return;
2108
2109 addrconf_addr_solict_mult(addr, &maddr);
2110 __ipv6_dev_mc_dec(idev, &maddr);
2111}
2112
a9ed4a29 2113/* caller must hold RTNL */
20380731 2114static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2115{
2116 struct in6_addr addr;
c15b1cca 2117
88ad3149 2118 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 2119 return;
1da177e4
LT		 2120 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2121 if (ipv6_addr_any(&addr))
2122 return;
013b4d90 2123 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 2124}
2125
a9ed4a29 2126/* caller must hold RTNL */
20380731 2127static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2128{
2129 struct in6_addr addr;
c15b1cca 2130
88ad3149 2131 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 2132 return;
1da177e4
LT		 2133 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2134 if (ipv6_addr_any(&addr))
2135 return;
2136 __ipv6_dev_ac_dec(ifp->idev, &addr);
2137}
2138
8a7a4b47 2139static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
06a4c1c5 2140{
8a7a4b47
AA		 2141 switch (dev->addr_len) {
2142 case ETH_ALEN:
9dae2e03
LAD		 2143 memcpy(eui, dev->dev_addr, 3);
2144 eui[3] = 0xFF;
2145 eui[4] = 0xFE;
2146 memcpy(eui + 5, dev->dev_addr + 3, 3);
2147 break;
8a7a4b47
AA		 2148 case EUI64_ADDR_LEN:
2149 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2150 eui[0] ^= 2;
2151 break;
2152 default:
06a4c1c5 2153 return -1;
8a7a4b47
AA		 2154 }
2155
06a4c1c5 2156 return 0;
2157}
2158
cb6bf355
YH		 2159static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2160{
2161 union fwnet_hwaddr *ha;
2162
2163 if (dev->addr_len != FWNET_ALEN)
2164 return -1;
2165
2166 ha = (union fwnet_hwaddr *)dev->dev_addr;
2167
2168 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2169 eui[0] ^= 2;
2170 return 0;
2171}
2172
073a8e0e
YH		 2173static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2174{
2175 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2176 if (dev->addr_len != ARCNET_ALEN)
2177 return -1;
2178 memset(eui, 0, 7);
8e5e8f30 2179 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 2180 return 0;
2181}
2182
2183static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2184{
2185 if (dev->addr_len != INFINIBAND_ALEN)
2186 return -1;
2187 memcpy(eui, dev->dev_addr + 12, 8);
2188 eui[0] |= 2;
2189 return 0;
2190}
2191
c61393ea 2192static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2193{
9af28511
SH		 2194 if (addr == 0)
2195 return -1;
dfd982ba
YH		 2196 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2197 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2198 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2199 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2200 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2201 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2202 eui[1] = 0;
2203 eui[2] = 0x5E;
2204 eui[3] = 0xFE;
2205 memcpy(eui + 4, &addr, 4);
2206 return 0;
2207}
dfd982ba
YH		 2208
2209static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2210{
2211 if (dev->priv_flags & IFF_ISATAP)
2212 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2213 return -1;
2214}
2215
aee80b54 2216static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2217{
2218 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2219}
2220
e837735e
ND		 2221static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2222{
2223 memcpy(eui, dev->perm_addr, 3);
2224 memcpy(eui + 5, dev->perm_addr + 3, 3);
2225 eui[3] = 0xFF;
2226 eui[4] = 0xFE;
2227 eui[0] ^= 2;
2228 return 0;
2229}
2230
1da177e4
LT		 2231static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2232{
2233 switch (dev->type) {
2234 case ARPHRD_ETHER:
2235 case ARPHRD_FDDI:
073a8e0e 2236 return addrconf_ifid_eui48(eui, dev);
1da177e4 2237 case ARPHRD_ARCNET:
073a8e0e 2238 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2239 case ARPHRD_INFINIBAND:
073a8e0e 2240 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2241 case ARPHRD_SIT:
dfd982ba 2242 return addrconf_ifid_sit(eui, dev);
aee80b54 2243 case ARPHRD_IPGRE:
45ce0fd1 2244 case ARPHRD_TUNNEL:
aee80b54 2245 return addrconf_ifid_gre(eui, dev);
e74bccb8 2246 case ARPHRD_6LOWPAN:
8a7a4b47 2247 return addrconf_ifid_6lowpan(eui, dev);
cb6bf355
YH		 2248 case ARPHRD_IEEE1394:
2249 return addrconf_ifid_ieee1394(eui, dev);
e837735e 2250 case ARPHRD_TUNNEL6:
45ce0fd1 2251 case ARPHRD_IP6GRE:
9deb441c 2252 case ARPHRD_RAWIP:
e837735e 2253 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2254 }
2255 return -1;
2256}
2257
2258static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2259{
2260 int err = -1;
2261 struct inet6_ifaddr *ifp;
2262
2263 read_lock_bh(&idev->lock);
602582ca
HFS		 2264 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2265 if (ifp->scope > IFA_LINK)
2266 break;
1da177e4
LT		 2267 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2268 memcpy(eui, ifp->addr.s6_addr+8, 8);
2269 err = 0;
2270 break;
2271 }
2272 }
2273 read_unlock_bh(&idev->lock);
2274 return err;
2275}
2276
1da177e4 2277/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
9d6280da 2278static void ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2279{
1da177e4 2280regen:
955189ef 2281 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2282 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2283
2284 /*
2285 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2286 * check if generated address is not inappropriate
2287 *
2288 * - Reserved subnet anycast (RFC 2526)
2289 * 11111101 11....11 1xxxxxxx
c7dc89c0 2290 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2291 * 00-00-5E-FE-xx-xx-xx-xx
2292 * - value 0
2293 * - XXX: already assigned to an address on the device
2294 */
1ab1457c 2295 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2296 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2297 (idev->rndid[7]&0x80))
2298 goto regen;
2299 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2300 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2301 goto regen;
2302 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2303 goto regen;
2304 }
1da177e4
LT		 2305}
2306
9d6280da 2307static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2308{
1da177e4 2309 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
9d6280da 2310 ipv6_regen_rndid(idev);
1da177e4 2311}
1da177e4
LT		 2312
2313/*
2314 * Add prefix route.
2315 */
2316
2317static void
8308f3ff
DA		 2318addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2319 struct net_device *dev, unsigned long expires,
2320 u32 flags, gfp_t gfp_flags)
1da177e4 2321{
86872cb5 2322 struct fib6_config cfg = {
ca254490 2323 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
8308f3ff 2324 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
86872cb5
TG		 2325 .fc_ifindex = dev->ifindex,
2326 .fc_expires = expires,
2327 .fc_dst_len = plen,
2328 .fc_flags = RTF_UP | flags,
c346dca1 2329 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2330 .fc_protocol = RTPROT_KERNEL,
e8478e80 2331 .fc_type = RTN_UNICAST,
86872cb5 2332 };
1da177e4 2333
4e3fd7a0 2334 cfg.fc_dst = *pfx;
1da177e4
LT		 2335
2336 /* Prevent useless cloning on PtP SIT.
2337 This thing is done here expecting that the whole
2338 class of non-broadcast devices need not cloning.
2339 */
07a93626 2340#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2341 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2342 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2343#endif
1da177e4 2344
acb54e3c 2345 ip6_route_add(&cfg, gfp_flags, NULL);
1da177e4
LT		 2346}
2347
14ef37b6 2348
8d1c802b 2349static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
14ef37b6
AH		 2350 int plen,
2351 const struct net_device *dev,
2352 u32 flags, u32 noflags)
2353{
2354 struct fib6_node *fn;
8d1c802b 2355 struct fib6_info *rt = NULL;
14ef37b6 2356 struct fib6_table *table;
ca254490 2357 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2358
ca254490 2359 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2360 if (!table)
14ef37b6
AH		 2361 return NULL;
2362
66f5d6ce 2363 rcu_read_lock();
38fbeeee 2364 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
14ef37b6
AH		 2365 if (!fn)
2366 goto out;
1f56a01f 2367
66f5d6ce 2368 for_each_fib6_node_rt_rcu(fn) {
5e670d84 2369 if (rt->fib6_nh.nh_dev->ifindex != dev->ifindex)
14ef37b6 2370 continue;
93c2fb25 2371 if ((rt->fib6_flags & flags) != flags)
14ef37b6 2372 continue;
93c2fb25 2373 if ((rt->fib6_flags & noflags) != 0)
14ef37b6 2374 continue;
e873e4b9
WW		 2375 if (!fib6_info_hold_safe(rt))
2376 continue;
14ef37b6
AH		 2377 break;
2378 }
2379out:
66f5d6ce 2380 rcu_read_unlock();
14ef37b6
AH		 2381 return rt;
2382}
2383
2384
1da177e4
LT		 2385/* Create "default" multicast route to the interface */
2386
2387static void addrconf_add_mroute(struct net_device *dev)
2388{
86872cb5 2389 struct fib6_config cfg = {
ca254490 2390 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2391 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2392 .fc_ifindex = dev->ifindex,
2393 .fc_dst_len = 8,
2394 .fc_flags = RTF_UP,
e8478e80 2395 .fc_type = RTN_UNICAST,
c346dca1 2396 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2397 };
2398
2399 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2400
e500c6d3 2401 ip6_route_add(&cfg, GFP_KERNEL, NULL);
1da177e4
LT		 2402}
2403
1da177e4
LT		 2404static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2405{
2406 struct inet6_dev *idev;
2407
2408 ASSERT_RTNL();
2409
e21e8467
SH		 2410 idev = ipv6_find_idev(dev);
2411 if (!idev)
64e724f6
BH		 2412 return ERR_PTR(-ENOBUFS);
2413
2414 if (idev->cnf.disable_ipv6)
2415 return ERR_PTR(-EACCES);
1da177e4
LT		 2416
2417 /* Add default multicast route */
ba46ee4c 2418 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
4af04aba 2419 addrconf_add_mroute(dev);
1da177e4 2420
1da177e4
LT		 2421 return idev;
2422}
2423
53bd6749
JP		 2424static void manage_tempaddrs(struct inet6_dev *idev,
2425 struct inet6_ifaddr *ifp,
2426 __u32 valid_lft, __u32 prefered_lft,
2427 bool create, unsigned long now)
2428{
2429 u32 flags;
2430 struct inet6_ifaddr *ift;
2431
2432 read_lock_bh(&idev->lock);
2433 /* update all temporary addresses in the list */
2434 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2435 int age, max_valid, max_prefered;
2436
2437 if (ifp != ift->ifpub)
2438 continue;
2439
2440 /* RFC 4941 section 3.3:
2441 * If a received option will extend the lifetime of a public
2442 * address, the lifetimes of temporary addresses should
2443 * be extended, subject to the overall constraint that no
2444 * temporary addresses should ever remain "valid" or "preferred"
2445 * for a time longer than (TEMP_VALID_LIFETIME) or
2446 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2447 */
2448 age = (now - ift->cstamp) / HZ;
2449 max_valid = idev->cnf.temp_valid_lft - age;
2450 if (max_valid < 0)
2451 max_valid = 0;
2452
2453 max_prefered = idev->cnf.temp_prefered_lft -
76506a98 2454 idev->desync_factor - age;
53bd6749
JP		 2455 if (max_prefered < 0)
2456 max_prefered = 0;
2457
2458 if (valid_lft > max_valid)
2459 valid_lft = max_valid;
2460
2461 if (prefered_lft > max_prefered)
2462 prefered_lft = max_prefered;
2463
2464 spin_lock(&ift->lock);
2465 flags = ift->flags;
2466 ift->valid_lft = valid_lft;
2467 ift->prefered_lft = prefered_lft;
2468 ift->tstamp = now;
2469 if (prefered_lft > 0)
2470 ift->flags &= ~IFA_F_DEPRECATED;
2471
2472 spin_unlock(&ift->lock);
2473 if (!(flags&IFA_F_TENTATIVE))
2474 ipv6_ifa_notify(0, ift);
2475 }
2476
2477 if ((create || list_empty(&idev->tempaddr_list)) &&
2478 idev->cnf.use_tempaddr > 0) {
2479 /* When a new public address is created as described
2480 * in [ADDRCONF], also create a new temporary address.
2481 * Also create a temporary address if it's enabled but
2482 * no temporary address currently exists.
2483 */
2484 read_unlock_bh(&idev->lock);
fffcefe9 2485 ipv6_create_tempaddr(ifp, NULL, false);
53bd6749
JP		 2486 } else {
2487 read_unlock_bh(&idev->lock);
2488 }
2489}
2490
cc9da6cc
BM		 2491static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2492{
d35a00b8
FJ		 2493 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2494 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc
BM		 2495}
2496
cc84b3c6
AA		 2497int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2498 const struct prefix_info *pinfo,
2499 struct inet6_dev *in6_dev,
2500 const struct in6_addr *addr, int addr_type,
2501 u32 addr_flags, bool sllao, bool tokenized,
2502 __u32 valid_lft, u32 prefered_lft)
4f672235
AA		 2503{
2504 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2505 int create = 0, update_lft = 0;
2506
2507 if (!ifp && valid_lft) {
2508 int max_addresses = in6_dev->cnf.max_addresses;
e6464b8c
DA		 2509 struct ifa6_config cfg = {
2510 .pfx = addr,
2511 .plen = pinfo->prefix_len,
2512 .ifa_flags = addr_flags,
2513 .valid_lft = valid_lft,
2514 .preferred_lft = prefered_lft,
2515 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2516 };
4f672235
AA		 2517
2518#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 2519 if ((net->ipv6.devconf_all->optimistic_dad ||
2520 in6_dev->cnf.optimistic_dad) &&
4f672235 2521 !net->ipv6.devconf_all->forwarding && sllao)
e6464b8c 2522 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
4f672235
AA		 2523#endif
2524
2525 /* Do not allow to create too much of autoconfigured
2526 * addresses; this would be too easy way to crash kernel.
2527 */
2528 if (!max_addresses ||
2529 ipv6_count_addresses(in6_dev) < max_addresses)
e6464b8c 2530 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
4f672235
AA		 2531
2532 if (IS_ERR_OR_NULL(ifp))
2533 return -1;
2534
4f672235
AA		 2535 create = 1;
2536 spin_lock_bh(&ifp->lock);
2537 ifp->flags |= IFA_F_MANAGETEMPADDR;
2538 ifp->cstamp = jiffies;
2539 ifp->tokenized = tokenized;
2540 spin_unlock_bh(&ifp->lock);
2541 addrconf_dad_start(ifp);
2542 }
2543
2544 if (ifp) {
2545 u32 flags;
2546 unsigned long now;
2547 u32 stored_lft;
2548
2549 /* update lifetime (RFC2462 5.5.3 e) */
2550 spin_lock_bh(&ifp->lock);
2551 now = jiffies;
2552 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2553 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2554 else
2555 stored_lft = 0;
f85f94b8 2556 if (!create && stored_lft) {
4f672235
AA		 2557 const u32 minimum_lft = min_t(u32,
2558 stored_lft, MIN_VALID_LIFETIME);
2559 valid_lft = max(valid_lft, minimum_lft);
2560
2561 /* RFC4862 Section 5.5.3e:
2562 * "Note that the preferred lifetime of the
2563 * corresponding address is always reset to
2564 * the Preferred Lifetime in the received
2565 * Prefix Information option, regardless of
2566 * whether the valid lifetime is also reset or
2567 * ignored."
2568 *
2569 * So we should always update prefered_lft here.
2570 */
2571 update_lft = 1;
2572 }
2573
2574 if (update_lft) {
2575 ifp->valid_lft = valid_lft;
2576 ifp->prefered_lft = prefered_lft;
2577 ifp->tstamp = now;
2578 flags = ifp->flags;
2579 ifp->flags &= ~IFA_F_DEPRECATED;
2580 spin_unlock_bh(&ifp->lock);
2581
2582 if (!(flags&IFA_F_TENTATIVE))
2583 ipv6_ifa_notify(0, ifp);
2584 } else
2585 spin_unlock_bh(&ifp->lock);
2586
2587 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2588 create, now);
2589
2590 in6_ifa_put(ifp);
2591 addrconf_verify();
2592 }
2593
2594 return 0;
2595}
cc84b3c6 2596EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
4f672235 2597
e6bff995 2598void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2599{
2600 struct prefix_info *pinfo;
2601 __u32 valid_lft;
2602 __u32 prefered_lft;
4f672235 2603 int addr_type, err;
64236f3f 2604 u32 addr_flags = 0;
1da177e4 2605 struct inet6_dev *in6_dev;
56d417b1 2606 struct net *net = dev_net(dev);
1da177e4
LT		 2607
2608 pinfo = (struct prefix_info *) opt;
1ab1457c 2609
1da177e4 2610 if (len < sizeof(struct prefix_info)) {
e32ac250 2611 netdev_dbg(dev, "addrconf: prefix option too short\n");
1da177e4
LT		 2612 return;
2613 }
1ab1457c 2614
1da177e4
LT		 2615 /*
2616 * Validation checks ([ADDRCONF], page 19)
2617 */
2618
2619 addr_type = ipv6_addr_type(&pinfo->prefix);
2620
2621 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2622 return;
2623
2624 valid_lft = ntohl(pinfo->valid);
2625 prefered_lft = ntohl(pinfo->prefered);
2626
2627 if (prefered_lft > valid_lft) {
e87cc472 2628 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2629 return;
2630 }
2631
2632 in6_dev = in6_dev_get(dev);
2633
63159f29 2634 if (!in6_dev) {
e87cc472
JP		 2635 net_dbg_ratelimited("addrconf: device %s not configured\n",
2636 dev->name);
1da177e4
LT		 2637 return;
2638 }
2639
2640 /*
2641 * Two things going on here:
2642 * 1) Add routes for on-link prefixes
2643 * 2) Configure prefixes with the auto flag set
2644 */
2645
4bed72e4 2646 if (pinfo->onlink) {
8d1c802b 2647 struct fib6_info *rt;
4bed72e4
YH		 2648 unsigned long rt_expires;
2649
6f704992
YH		 2650 /* Avoid arithmetic overflow. Really, we could
2651 * save rt_expires in seconds, likely valid_lft,
2652 * but it would require division in fib gc, that it
2653 * not good.
2654 */
4bed72e4
YH		 2655 if (HZ > USER_HZ)
2656 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2657 else
2658 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2659
4bed72e4
YH		 2660 if (addrconf_finite_timeout(rt_expires))
2661 rt_expires *= HZ;
1da177e4 2662
14ef37b6
AH		 2663 rt = addrconf_get_prefix_route(&pinfo->prefix,
2664 pinfo->prefix_len,
2665 dev,
2666 RTF_ADDRCONF | RTF_PREFIX_RT,
2667 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2668
14ef37b6 2669 if (rt) {
6f704992
YH		 2670 /* Autoconf prefix route */
2671 if (valid_lft == 0) {
afb1d4b5 2672 ip6_del_rt(net, rt);
6f704992 2673 rt = NULL;
4bed72e4 2674 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2675 /* not infinity */
14895687 2676 fib6_set_expires(rt, jiffies + rt_expires);
6f704992 2677 } else {
14895687 2678 fib6_clean_expires(rt);
1da177e4
LT		 2679 }
2680 } else if (valid_lft) {
6f704992 2681 clock_t expires = 0;
4bed72e4
YH		 2682 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2683 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2684 /* not infinity */
2685 flags |= RTF_EXPIRES;
2686 expires = jiffies_to_clock_t(rt_expires);
2687 }
1da177e4 2688 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
8308f3ff
DA		 2689 0, dev, expires, flags,
2690 GFP_ATOMIC);
1da177e4 2691 }
93531c67 2692 fib6_info_release(rt);
1da177e4
LT		 2693 }
2694
2695 /* Try to figure out our local address for this prefix */
2696
2697 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1da177e4 2698 struct in6_addr addr;
f997c55c 2699 bool tokenized = false, dev_addr_generated = false;
1da177e4
LT		 2700
2701 if (pinfo->prefix_len == 64) {
2702 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2703
2704 if (!ipv6_addr_any(&in6_dev->token)) {
2705 read_lock_bh(&in6_dev->lock);
2706 memcpy(addr.s6_addr + 8,
2707 in6_dev->token.s6_addr + 8, 8);
2708 read_unlock_bh(&in6_dev->lock);
617fe29d 2709 tokenized = true;
cc9da6cc 2710 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2711 !ipv6_generate_stable_address(&addr, 0,
2712 in6_dev)) {
64236f3f 2713 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2714 goto ok;
f53adae4
DB		 2715 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2716 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
4f672235 2717 goto put;
f997c55c
AA		 2718 } else {
2719 dev_addr_generated = true;
1da177e4
LT		 2720 }
2721 goto ok;
2722 }
e87cc472
JP		 2723 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2724 pinfo->prefix_len);
4f672235 2725 goto put;
1da177e4
LT		 2726
2727ok:
4f672235
AA		 2728 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2729 &addr, addr_type,
2730 addr_flags, sllao,
2731 tokenized, valid_lft,
2732 prefered_lft);
2733 if (err)
2734 goto put;
f997c55c
AA		 2735
2736 /* Ignore error case here because previous prefix add addr was
2737 * successful which will be notified.
2738 */
2739 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2740 addr_type, addr_flags, sllao,
2741 tokenized, valid_lft,
2742 prefered_lft,
2743 dev_addr_generated);
1da177e4
LT		 2744 }
2745 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
4f672235 2746put:
1da177e4
LT		 2747 in6_dev_put(in6_dev);
2748}
2749
2750/*
2751 * Set destination address.
2752 * Special case for SIT interfaces where we create a new "virtual"
2753 * device.
2754 */
af284937 2755int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2756{
2757 struct in6_ifreq ireq;
2758 struct net_device *dev;
2759 int err = -EINVAL;
2760
2761 rtnl_lock();
2762
2763 err = -EFAULT;
2764 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2765 goto err_exit;
2766
af284937 2767 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2768
2769 err = -ENODEV;
63159f29 2770 if (!dev)
1da177e4
LT		 2771 goto err_exit;
2772
07a93626 2773#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2774 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2775 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2776 struct ifreq ifr;
1da177e4
LT		 2777 struct ip_tunnel_parm p;
2778
2779 err = -EADDRNOTAVAIL;
2780 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2781 goto err_exit;
2782
2783 memset(&p, 0, sizeof(p));
2784 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2785 p.iph.saddr = 0;
2786 p.iph.version = 4;
2787 p.iph.ihl = 5;
2788 p.iph.protocol = IPPROTO_IPV6;
2789 p.iph.ttl = 64;
d20b3109 2790 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2791
5bc3eb7e
SH		 2792 if (ops->ndo_do_ioctl) {
2793 mm_segment_t oldfs = get_fs();
2794
2795 set_fs(KERNEL_DS);
2796 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2797 set_fs(oldfs);
2798 } else
2799 err = -EOPNOTSUPP;
1da177e4
LT		 2800
2801 if (err == 0) {
2802 err = -ENOBUFS;
af284937
DL		 2803 dev = __dev_get_by_name(net, p.name);
2804 if (!dev)
1da177e4
LT		 2805 goto err_exit;
2806 err = dev_open(dev);
2807 }
2808 }
0be669bb 2809#endif
1da177e4
LT		 2810
2811err_exit:
2812 rtnl_unlock();
2813 return err;
2814}
2815
93a714d6
MC		 2816static int ipv6_mc_config(struct sock *sk, bool join,
2817 const struct in6_addr *addr, int ifindex)
2818{
2819 int ret;
2820
2821 ASSERT_RTNL();
2822
2823 lock_sock(sk);
2824 if (join)
54ff9ef3 2825 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2826 else
54ff9ef3 2827 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2828 release_sock(sk);
2829
2830 return ret;
2831}
2832
1da177e4
LT		 2833/*
2834 * Manual configuration of address on an interface
2835 */
479840ff 2836static int inet6_addr_add(struct net *net, int ifindex,
19b1518c 2837 struct ifa6_config *cfg,
de95e047 2838 struct netlink_ext_ack *extack)
1da177e4
LT		 2839{
2840 struct inet6_ifaddr *ifp;
2841 struct inet6_dev *idev;
2842 struct net_device *dev;
93a714d6
MC		 2843 unsigned long timeout;
2844 clock_t expires;
6f704992 2845 u32 flags;
1da177e4
LT		 2846
2847 ASSERT_RTNL();
1ab1457c 2848
19b1518c 2849 if (cfg->plen > 128)
24ef0da7
TG		 2850 return -EINVAL;
2851
0778769d 2852 /* check the lifetime */
19b1518c 2853 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
0778769d
NT		 2854 return -EINVAL;
2855
19b1518c 2856 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
53bd6749
JP		 2857 return -EINVAL;
2858
af284937
DL		 2859 dev = __dev_get_by_index(net, ifindex);
2860 if (!dev)
1da177e4 2861 return -ENODEV;
1ab1457c 2862
64e724f6
BH		 2863 idev = addrconf_add_dev(dev);
2864 if (IS_ERR(idev))
2865 return PTR_ERR(idev);
1da177e4 2866
19b1518c 2867 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
93a714d6 2868 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
19b1518c 2869 true, cfg->pfx, ifindex);
93a714d6
MC		 2870
2871 if (ret < 0)
2872 return ret;
2873 }
2874
19b1518c 2875 cfg->scope = ipv6_addr_scope(cfg->pfx);
1da177e4 2876
19b1518c 2877 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4bed72e4
YH		 2878 if (addrconf_finite_timeout(timeout)) {
2879 expires = jiffies_to_clock_t(timeout * HZ);
19b1518c 2880 cfg->valid_lft = timeout;
6f704992 2881 flags = RTF_EXPIRES;
4bed72e4
YH		 2882 } else {
2883 expires = 0;
2884 flags = 0;
19b1518c 2885 cfg->ifa_flags |= IFA_F_PERMANENT;
6f704992 2886 }
0778769d 2887
19b1518c 2888 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4bed72e4
YH		 2889 if (addrconf_finite_timeout(timeout)) {
2890 if (timeout == 0)
19b1518c
DA		 2891 cfg->ifa_flags |= IFA_F_DEPRECATED;
2892 cfg->preferred_lft = timeout;
4bed72e4 2893 }
0778769d 2894
19b1518c 2895 ifp = ipv6_add_addr(idev, cfg, true, extack);
1da177e4 2896 if (!IS_ERR(ifp)) {
19b1518c 2897 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
8308f3ff
DA		 2898 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2899 ifp->rt_priority, dev, expires,
2900 flags, GFP_KERNEL);
761aac73
TH		 2901 }
2902
a2d481b3
LB		 2903 /* Send a netlink notification if DAD is enabled and
2904 * optimistic flag is not set
2905 */
2906 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2907 ipv6_ifa_notify(0, ifp);
95c385b4
NH		 2908 /*
2909 * Note that section 3.1 of RFC 4429 indicates
2910 * that the Optimistic flag should not be set for
2911 * manually configured addresses
2912 */
cf22f9a2 2913 addrconf_dad_start(ifp);
19b1518c
DA		 2914 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2915 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2916 cfg->preferred_lft, true, jiffies);
1da177e4 2917 in6_ifa_put(ifp);
c15b1cca 2918 addrconf_verify_rtnl();
1da177e4 2919 return 0;
19b1518c
DA		 2920 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2921 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
2922 cfg->pfx, ifindex);
1da177e4
LT		 2923 }
2924
2925 return PTR_ERR(ifp);
2926}
2927
6046d5b4
HK		 2928static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2929 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2930{
2931 struct inet6_ifaddr *ifp;
2932 struct inet6_dev *idev;
2933 struct net_device *dev;
1ab1457c 2934
24ef0da7
TG		 2935 if (plen > 128)
2936 return -EINVAL;
2937
af284937
DL		 2938 dev = __dev_get_by_index(net, ifindex);
2939 if (!dev)
1da177e4
LT		 2940 return -ENODEV;
2941
e5d08d71 2942 idev = __in6_dev_get(dev);
63159f29 2943 if (!idev)
1da177e4
LT		 2944 return -ENXIO;
2945
2946 read_lock_bh(&idev->lock);
502a2ffd 2947 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2948 if (ifp->prefix_len == plen &&
2949 ipv6_addr_equal(pfx, &ifp->addr)) {
2950 in6_ifa_hold(ifp);
2951 read_unlock_bh(&idev->lock);
1ab1457c 2952
6046d5b4
HK		 2953 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2954 (ifa_flags & IFA_F_MANAGETEMPADDR))
2955 manage_tempaddrs(idev, ifp, 0, 0, false,
2956 jiffies);
1da177e4 2957 ipv6_del_addr(ifp);
6046d5b4 2958 addrconf_verify_rtnl();
93a714d6
MC		 2959 if (ipv6_addr_is_multicast(pfx)) {
2960 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2961 false, pfx, dev->ifindex);
2962 }
1da177e4
LT		 2963 return 0;
2964 }
2965 }
2966 read_unlock_bh(&idev->lock);
2967 return -EADDRNOTAVAIL;
2968}
2969
2970
af284937 2971int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4 2972{
19b1518c
DA		 2973 struct ifa6_config cfg = {
2974 .ifa_flags = IFA_F_PERMANENT,
2975 .preferred_lft = INFINITY_LIFE_TIME,
2976 .valid_lft = INFINITY_LIFE_TIME,
2977 };
1da177e4
LT		 2978 struct in6_ifreq ireq;
2979 int err;
1ab1457c 2980
af31f412 2981 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2982 return -EPERM;
1ab1457c 2983
1da177e4
LT		 2984 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2985 return -EFAULT;
2986
19b1518c
DA		 2987 cfg.pfx = &ireq.ifr6_addr;
2988 cfg.plen = ireq.ifr6_prefixlen;
2989
1da177e4 2990 rtnl_lock();
19b1518c 2991 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
1da177e4
LT		 2992 rtnl_unlock();
2993 return err;
2994}
2995
af284937 2996int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2997{
2998 struct in6_ifreq ireq;
2999 int err;
1ab1457c 3000
af31f412 3001 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 3002 return -EPERM;
3003
3004 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3005 return -EFAULT;
3006
3007 rtnl_lock();
6046d5b4 3008 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 3009 ireq.ifr6_prefixlen);
1da177e4
LT		 3010 rtnl_unlock();
3011 return err;
3012}
3013
b5f348e5
IJ		 3014static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3015 int plen, int scope)
3016{
3017 struct inet6_ifaddr *ifp;
e6464b8c
DA		 3018 struct ifa6_config cfg = {
3019 .pfx = addr,
3020 .plen = plen,
3021 .ifa_flags = IFA_F_PERMANENT,
3022 .valid_lft = INFINITY_LIFE_TIME,
3023 .preferred_lft = INFINITY_LIFE_TIME,
3024 .scope = scope
3025 };
b5f348e5 3026
e6464b8c 3027 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
b5f348e5
IJ		 3028 if (!IS_ERR(ifp)) {
3029 spin_lock_bh(&ifp->lock);
3030 ifp->flags &= ~IFA_F_TENTATIVE;
3031 spin_unlock_bh(&ifp->lock);
764d3be6 3032 rt_genid_bump_ipv6(dev_net(idev->dev));
b5f348e5
IJ		 3033 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3034 in6_ifa_put(ifp);
3035 }
3036}
3037
07a93626 3038#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3039static void sit_add_v4_addrs(struct inet6_dev *idev)
3040{
1da177e4
LT		 3041 struct in6_addr addr;
3042 struct net_device *dev;
c346dca1 3043 struct net *net = dev_net(idev->dev);
929c9cf3 3044 int scope, plen;
f0e2acfa 3045 u32 pflags = 0;
1da177e4
LT		 3046
3047 ASSERT_RTNL();
3048
3049 memset(&addr, 0, sizeof(struct in6_addr));
3050 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3051
3052 if (idev->dev->flags&IFF_POINTOPOINT) {
3053 addr.s6_addr32[0] = htonl(0xfe800000);
3054 scope = IFA_LINK;
929c9cf3 3055 plen = 64;
1da177e4
LT		 3056 } else {
3057 scope = IPV6_ADDR_COMPATv4;
929c9cf3 3058 plen = 96;
f0e2acfa 3059 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 3060 }
3061
3062 if (addr.s6_addr32[3]) {
929c9cf3 3063 add_addr(idev, &addr, plen, scope);
8308f3ff 3064 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
e500c6d3 3065 GFP_KERNEL);
1da177e4
LT		 3066 return;
3067 }
3068
6fda7350 3069 for_each_netdev(net, dev) {
8e5e8f30 3070 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 3071 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 3072 struct in_ifaddr *ifa;
1da177e4
LT		 3073
3074 int flag = scope;
3075
3076 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 3077
3078 addr.s6_addr32[3] = ifa->ifa_local;
3079
3080 if (ifa->ifa_scope == RT_SCOPE_LINK)
3081 continue;
3082 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3083 if (idev->dev->flags&IFF_POINTOPOINT)
3084 continue;
3085 flag |= IFA_HOST;
3086 }
1da177e4 3087
b5f348e5 3088 add_addr(idev, &addr, plen, flag);
8308f3ff 3089 addrconf_prefix_route(&addr, plen, 0, idev->dev,
e500c6d3 3090 0, pflags, GFP_KERNEL);
1da177e4
LT		 3091 }
3092 }
1ab1457c 3093 }
1da177e4 3094}
0be669bb 3095#endif
1da177e4
LT		 3096
3097static void init_loopback(struct net_device *dev)
3098{
3099 struct inet6_dev *idev;
1da177e4
LT		 3100
3101 /* ::1 */
3102
3103 ASSERT_RTNL();
3104
e5d08d71 3105 idev = ipv6_find_idev(dev);
63159f29 3106 if (!idev) {
91df42be 3107 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3108 return;
3109 }
3110
b5f348e5 3111 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 3112}
3113
2ad3ed59
AA		 3114void addrconf_add_linklocal(struct inet6_dev *idev,
3115 const struct in6_addr *addr, u32 flags)
1da177e4 3116{
e6464b8c
DA		 3117 struct ifa6_config cfg = {
3118 .pfx = addr,
3119 .plen = 64,
3120 .ifa_flags = flags | IFA_F_PERMANENT,
3121 .valid_lft = INFINITY_LIFE_TIME,
3122 .preferred_lft = INFINITY_LIFE_TIME,
3123 .scope = IFA_LINK
3124 };
8e5e8f30 3125 struct inet6_ifaddr *ifp;
95c385b4
NH		 3126
3127#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 3128 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3129 idev->cnf.optimistic_dad) &&
702beb87 3130 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
e6464b8c 3131 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
95c385b4 3132#endif
1da177e4 3133
e6464b8c 3134 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
1da177e4 3135 if (!IS_ERR(ifp)) {
8308f3ff 3136 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
acb54e3c 3137 0, 0, GFP_ATOMIC);
cf22f9a2 3138 addrconf_dad_start(ifp);
1da177e4
LT		 3139 in6_ifa_put(ifp);
3140 }
3141}
2ad3ed59 3142EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
1da177e4 3143
622c81d5
HFS		 3144static bool ipv6_reserved_interfaceid(struct in6_addr address)
3145{
3146 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3147 return true;
3148
3149 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3150 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3151 return true;
3152
3153 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3154 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3155 return true;
3156
3157 return false;
3158}
3159
3160static int ipv6_generate_stable_address(struct in6_addr *address,
3161 u8 dad_count,
3162 const struct inet6_dev *idev)
3163{
622c81d5
HFS		 3164 static DEFINE_SPINLOCK(lock);
3165 static __u32 digest[SHA_DIGEST_WORDS];
3166 static __u32 workspace[SHA_WORKSPACE_WORDS];
3167
3168 static union {
3169 char __data[SHA_MESSAGE_BYTES];
3170 struct {
3171 struct in6_addr secret;
ff40217e 3172 __be32 prefix[2];
622c81d5
HFS		 3173 unsigned char hwaddr[MAX_ADDR_LEN];
3174 u8 dad_count;
3175 } __packed;
3176 } data;
3177
3178 struct in6_addr secret;
3179 struct in6_addr temp;
3180 struct net *net = dev_net(idev->dev);
3181
3182 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3183
3184 if (idev->cnf.stable_secret.initialized)
3185 secret = idev->cnf.stable_secret.secret;
3186 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3187 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3188 else
3189 return -1;
3190
3191retry:
3192 spin_lock_bh(&lock);
3193
3194 sha_init(digest);
3195 memset(&data, 0, sizeof(data));
3196 memset(workspace, 0, sizeof(workspace));
3197 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3198 data.prefix[0] = address->s6_addr32[0];
3199 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3200 data.secret = secret;
3201 data.dad_count = dad_count;
3202
3203 sha_transform(digest, data.__data, workspace);
3204
3205 temp = *address;
ff40217e
HFS		 3206 temp.s6_addr32[2] = (__force __be32)digest[0];
3207 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3208
3209 spin_unlock_bh(&lock);
3210
3211 if (ipv6_reserved_interfaceid(temp)) {
3212 dad_count++;
1855b7c3 3213 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3214 return -1;
3215 goto retry;
3216 }
3217
3218 *address = temp;
3219 return 0;
3220}
3221
cc9da6cc
BM		 3222static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3223{
3224 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3225
3226 if (s->initialized)
3227 return;
3228 s = &idev->cnf.stable_secret;
3229 get_random_bytes(&s->secret, sizeof(s->secret));
3230 s->initialized = true;
3231}
3232
bc91b0f0
JP		 3233static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3234{
622c81d5
HFS		 3235 struct in6_addr addr;
3236
ca254490
DA		 3237 /* no link local addresses on L3 master devices */
3238 if (netif_is_l3_master(idev->dev))
3239 return;
3240
622c81d5 3241 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3242
d35a00b8 3243 switch (idev->cnf.addr_gen_mode) {
cc9da6cc
BM		 3244 case IN6_ADDR_GEN_MODE_RANDOM:
3245 ipv6_gen_mode_random_init(idev);
3246 /* fallthrough */
3247 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3248 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3249 addrconf_add_linklocal(idev, &addr,
3250 IFA_F_STABLE_PRIVACY);
622c81d5 3251 else if (prefix_route)
8308f3ff 3252 addrconf_prefix_route(&addr, 64, 0, idev->dev,
acb54e3c 3253 0, 0, GFP_KERNEL);
cc9da6cc
BM		 3254 break;
3255 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3256 /* addrconf_add_linklocal also adds a prefix_route and we
3257 * only need to care about prefix routes if ipv6_generate_eui64
3258 * couldn't generate one.
3259 */
3260 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3261 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0 3262 else if (prefix_route)
8308f3ff 3263 addrconf_prefix_route(&addr, 64, 0, idev->dev,
27b10608 3264 0, 0, GFP_KERNEL);
cc9da6cc
BM		 3265 break;
3266 case IN6_ADDR_GEN_MODE_NONE:
3267 default:
3268 /* will not add any link local address */
3269 break;
bc91b0f0
JP		 3270 }
3271}
3272
1da177e4
LT		 3273static void addrconf_dev_config(struct net_device *dev)
3274{
8e5e8f30 3275 struct inet6_dev *idev;
1da177e4
LT		 3276
3277 ASSERT_RTNL();
3278
74235a25
HX		 3279 if ((dev->type != ARPHRD_ETHER) &&
3280 (dev->type != ARPHRD_FDDI) &&
74235a25 3281 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3282 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3283 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3284 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc 3285 (dev->type != ARPHRD_6LOWPAN) &&
45ce0fd1
FJ		 3286 (dev->type != ARPHRD_IP6GRE) &&
3287 (dev->type != ARPHRD_IPGRE) &&
3288 (dev->type != ARPHRD_TUNNEL) &&
9deb441c
SAK		 3289 (dev->type != ARPHRD_NONE) &&
3290 (dev->type != ARPHRD_RAWIP)) {
74235a25
HX		 3291 /* Alas, we support only Ethernet autoconfiguration. */
3292 return;
3293 }
3294
1da177e4 3295 idev = addrconf_add_dev(dev);
64e724f6 3296 if (IS_ERR(idev))
1da177e4
LT		 3297 return;
3298
cc9da6cc
BM		 3299 /* this device type has no EUI support */
3300 if (dev->type == ARPHRD_NONE &&
d35a00b8
FJ		 3301 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3302 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc 3303
bc91b0f0 3304 addrconf_addr_gen(idev, false);
1da177e4
LT		 3305}
3306
07a93626 3307#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3308static void addrconf_sit_config(struct net_device *dev)
3309{
3310 struct inet6_dev *idev;
3311
3312 ASSERT_RTNL();
3313
1ab1457c
YH		 3314 /*
3315 * Configure the tunnel with one of our IPv4
3316 * addresses... we should configure all of
1da177e4
LT		 3317 * our v4 addrs in the tunnel
3318 */
3319
e5d08d71 3320 idev = ipv6_find_idev(dev);
63159f29 3321 if (!idev) {
91df42be 3322 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3323 return;
3324 }
3325
c7dc89c0 3326 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3327 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3328 return;
3329 }
3330
1da177e4
LT		 3331 sit_add_v4_addrs(idev);
3332
62b54dd9 3333 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3334 addrconf_add_mroute(dev);
1da177e4 3335}
0be669bb 3336#endif
1da177e4 3337
07a93626 3338#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3339static void addrconf_gre_config(struct net_device *dev)
3340{
3341 struct inet6_dev *idev;
aee80b54 3342
aee80b54 3343 ASSERT_RTNL();
3344
e5d08d71 3345 idev = ipv6_find_idev(dev);
63159f29 3346 if (!idev) {
91df42be 3347 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3348 return;
3349 }
3350
bc91b0f0 3351 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3352 if (dev->flags & IFF_POINTOPOINT)
3353 addrconf_add_mroute(dev);
aee80b54 3354}
3355#endif
3356
afb1d4b5
DA		 3357static int fixup_permanent_addr(struct net *net,
3358 struct inet6_dev *idev,
f1705ec1
DA		 3359 struct inet6_ifaddr *ifp)
3360{
93c2fb25 3361 /* !fib6_node means the host route was removed from the
8048ced9
DA		 3362 * FIB, for example, if 'lo' device is taken down. In that
3363 * case regenerate the host route.
3364 */
93c2fb25 3365 if (!ifp->rt || !ifp->rt->fib6_node) {
360a9887 3366 struct fib6_info *f6i, *prev;
f1705ec1 3367
360a9887
DA		 3368 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3369 GFP_ATOMIC);
3370 if (IS_ERR(f6i))
3371 return PTR_ERR(f6i);
f1705ec1 3372
8048ced9
DA		 3373 /* ifp->rt can be accessed outside of rtnl */
3374 spin_lock(&ifp->lock);
3375 prev = ifp->rt;
360a9887 3376 ifp->rt = f6i;
8048ced9
DA		 3377 spin_unlock(&ifp->lock);
3378
93531c67 3379 fib6_info_release(prev);
f1705ec1
DA		 3380 }
3381
3382 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3383 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
8308f3ff
DA		 3384 ifp->rt_priority, idev->dev, 0, 0,
3385 GFP_ATOMIC);
f1705ec1
DA		 3386 }
3387
6d717134
DA		 3388 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3389 addrconf_dad_start(ifp);
f1705ec1
DA		 3390
3391 return 0;
3392}
3393
afb1d4b5 3394static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
f1705ec1
DA		 3395{
3396 struct inet6_ifaddr *ifp, *tmp;
3397 struct inet6_dev *idev;
3398
3399 idev = __in6_dev_get(dev);
3400 if (!idev)
3401 return;
3402
3403 write_lock_bh(&idev->lock);
3404
3405 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3406 if ((ifp->flags & IFA_F_PERMANENT) &&
afb1d4b5 3407 fixup_permanent_addr(net, idev, ifp) < 0) {
f1705ec1 3408 write_unlock_bh(&idev->lock);
e669b869 3409 in6_ifa_hold(ifp);
f1705ec1
DA		 3410 ipv6_del_addr(ifp);
3411 write_lock_bh(&idev->lock);
3412
3413 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3414 idev->dev->name, &ifp->addr);
3415 }
3416 }
3417
3418 write_unlock_bh(&idev->lock);
3419}
3420
1ab1457c 3421static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3422 void *ptr)
1da177e4 3423{
351638e7 3424 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4f7f34ea 3425 struct netdev_notifier_changeupper_info *info;
748e2d93 3426 struct inet6_dev *idev = __in6_dev_get(dev);
60abc0be 3427 struct net *net = dev_net(dev);
c5e33bdd 3428 int run_pending = 0;
b217d616 3429 int err;
1da177e4 3430
e21e8467 3431 switch (event) {
45ba9dd2 3432 case NETDEV_REGISTER:
74235a25 3433 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3434 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3435 if (IS_ERR(idev))
3436 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3437 }
3438 break;
bcdd553f 3439
b7b0b1d2
AD		 3440 case NETDEV_CHANGEMTU:
3441 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3442 if (dev->mtu < IPV6_MIN_MTU) {
60abc0be 3443 addrconf_ifdown(dev, dev != net->loopback_dev);
b7b0b1d2
AD		 3444 break;
3445 }
3446
3447 if (idev) {
3448 rt6_mtu_change(dev, dev->mtu);
3449 idev->cnf.mtu6 = dev->mtu;
3450 break;
3451 }
3452
3453 /* allocate new idev */
3454 idev = ipv6_add_dev(dev);
3455 if (IS_ERR(idev))
3456 break;
3457
3458 /* device is still not ready */
3459 if (!(idev->if_flags & IF_READY))
3460 break;
3461
3462 run_pending = 1;
3463
3464 /* fall through */
3465
1da177e4 3466 case NETDEV_UP:
3c21edbd 3467 case NETDEV_CHANGE:
c2edacf8
JV		 3468 if (dev->flags & IFF_SLAVE)
3469 break;
3470
3ce62a84
WC		 3471 if (idev && idev->cnf.disable_ipv6)
3472 break;
3473
3c21edbd 3474 if (event == NETDEV_UP) {
38bd10c4 3475 /* restore routes for permanent addresses */
afb1d4b5 3476 addrconf_permanent_addr(net, dev);
38bd10c4 3477
1f372c7b 3478 if (!addrconf_link_ready(dev)) {
3c21edbd 3479 /* device is not ready yet. */
f3213831 3480 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3481 dev->name);
3482 break;
3483 }
99081049 3484
d31c7b8f
EP		 3485 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3486 idev = ipv6_add_dev(dev);
3487
a317a2f1 3488 if (!IS_ERR_OR_NULL(idev)) {
99081049 3489 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3490 run_pending = 1;
3491 }
b7b0b1d2 3492 } else if (event == NETDEV_CHANGE) {
1f372c7b 3493 if (!addrconf_link_ready(dev)) {
3c21edbd 3494 /* device is still not ready. */
27c6fa73 3495 rt6_sync_down_dev(dev, event);
3c21edbd
YH		 3496 break;
3497 }
3498
3499 if (idev) {
a088d1d7
LL		 3500 if (idev->if_flags & IF_READY) {
3501 /* device is already configured -
3502 * but resend MLD reports, we might
3503 * have roamed and need to update
3504 * multicast snooping switches
3505 */
3506 ipv6_mc_up(idev);
27c6fa73 3507 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3c21edbd 3508 break;
a088d1d7 3509 }
3c21edbd
YH		 3510 idev->if_flags |= IF_READY;
3511 }
3512
f3213831
JP		 3513 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3514 dev->name);
3c21edbd 3515
c5e33bdd 3516 run_pending = 1;
3c21edbd
YH		 3517 }
3518
e21e8467 3519 switch (dev->type) {
07a93626 3520#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3521 case ARPHRD_SIT:
3522 addrconf_sit_config(dev);
3523 break;
aee80b54 3524#endif
07a93626 3525#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3526 case ARPHRD_IPGRE:
3527 addrconf_gre_config(dev);
3528 break;
0be669bb 3529#endif
1da177e4
LT		 3530 case ARPHRD_LOOPBACK:
3531 init_loopback(dev);
3532 break;
3533
3534 default:
3535 addrconf_dev_config(dev);
3536 break;
3ff50b79 3537 }
bcdd553f 3538
a317a2f1 3539 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3540 if (run_pending)
3541 addrconf_dad_run(idev);
3542
2127d95a
IS		 3543 /* Device has an address by now */
3544 rt6_sync_up(dev, RTNH_F_DEAD);
3545
bcdd553f
SH		 3546 /*
3547 * If the MTU changed during the interface down,
3548 * when the interface up, the changed MTU must be
3549 * reflected in the idev as well as routers.
1da177e4 3550 */
bcdd553f
SH		 3551 if (idev->cnf.mtu6 != dev->mtu &&
3552 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3553 rt6_mtu_change(dev, dev->mtu);
3554 idev->cnf.mtu6 = dev->mtu;
3555 }
3556 idev->tstamp = jiffies;
3557 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3558
3559 /*
3560 * If the changed mtu during down is lower than
3561 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3562 */
3563 if (dev->mtu < IPV6_MIN_MTU)
60abc0be 3564 addrconf_ifdown(dev, dev != net->loopback_dev);
1da177e4
LT		 3565 }
3566 break;
3567
1da177e4
LT		 3568 case NETDEV_DOWN:
3569 case NETDEV_UNREGISTER:
3570 /*
3571 * Remove all addresses from this interface.
3572 */
3573 addrconf_ifdown(dev, event != NETDEV_DOWN);
3574 break;
3c21edbd 3575
1da177e4 3576 case NETDEV_CHANGENAME:
1da177e4 3577 if (idev) {
5632c515 3578 snmp6_unregister_dev(idev);
408c4768 3579 addrconf_sysctl_unregister(idev);
a317a2f1 3580 err = addrconf_sysctl_register(idev);
b217d616
HX		 3581 if (err)
3582 return notifier_from_errno(err);
a317a2f1
WC		 3583 err = snmp6_register_dev(idev);
3584 if (err) {
3585 addrconf_sysctl_unregister(idev);
3586 return notifier_from_errno(err);
3587 }
5632c515 3588 }
1da177e4 3589 break;
bcdd553f 3590
93d9b7d7
JP		 3591 case NETDEV_PRE_TYPE_CHANGE:
3592 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3593 if (idev)
3594 addrconf_type_change(dev, event);
75c78500 3595 break;
4f7f34ea
DA		 3596
3597 case NETDEV_CHANGEUPPER:
3598 info = ptr;
3599
3600 /* flush all routes if dev is linked to or unlinked from
3601 * an L3 master device (e.g., VRF)
3602 */
3603 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3604 addrconf_ifdown(dev, 0);
3ff50b79 3605 }
1da177e4
LT		 3606
3607 return NOTIFY_OK;
3608}
3609
3610/*
3611 * addrconf module should be notified of a device going up
3612 */
3613static struct notifier_block ipv6_dev_notf = {
3614 .notifier_call = addrconf_notify,
242d3a49 3615 .priority = ADDRCONF_NOTIFY_PRIORITY,
1da177e4
LT		 3616};
3617
93d9b7d7 3618static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3619{
3620 struct inet6_dev *idev;
3621 ASSERT_RTNL();
3622
3623 idev = __in6_dev_get(dev);
3624
93d9b7d7 3625 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3626 ipv6_mc_remap(idev);
93d9b7d7 3627 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3628 ipv6_mc_unmap(idev);
3629}
3630
70af921d
DA		 3631static bool addr_is_local(const struct in6_addr *addr)
3632{
3633 return ipv6_addr_type(addr) &
3634 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3635}
3636
1da177e4
LT		 3637static int addrconf_ifdown(struct net_device *dev, int how)
3638{
4c981e28 3639 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN;
c346dca1 3640 struct net *net = dev_net(dev);
502a2ffd 3641 struct inet6_dev *idev;
f1705ec1 3642 struct inet6_ifaddr *ifa, *tmp;
0aef78aa 3643 bool keep_addr = false;
73a8bd74 3644 int state, i;
1da177e4
LT		 3645
3646 ASSERT_RTNL();
3647
4c981e28 3648 rt6_disable_ip(dev, event);
1da177e4
LT		 3649
3650 idev = __in6_dev_get(dev);
63159f29 3651 if (!idev)
1da177e4
LT		 3652 return -ENODEV;
3653
bcdd553f
SH		 3654 /*
3655 * Step 1: remove reference to ipv6 device from parent device.
3656 * Do not dev_put!
1da177e4 3657 */
439e2385 3658 if (how) {
1da177e4 3659 idev->dead = 1;
8814c4b5
YH		 3660
3661 /* protected by rtnl_lock */
a9b3cd7f 3662 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3663
3664 /* Step 1.5: remove snmp6 entry */
3665 snmp6_unregister_dev(idev);
3666
3667 }
3668
f1705ec1
DA		 3669 /* combine the user config with event to determine if permanent
3670 * addresses are to be removed from address hash table
3671 */
0aef78aa
IV		 3672 if (!how && !idev->cnf.disable_ipv6) {
3673 /* aggregate the system setting and interface setting */
3674 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3675
3676 if (!_keep_addr)
3677 _keep_addr = idev->cnf.keep_addr_on_down;
3678
3679 keep_addr = (_keep_addr > 0);
3680 }
f1705ec1 3681
73a8bd74
DM		 3682 /* Step 2: clear hash table */
3683 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3684 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3685
3686 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3687restart:
b67bfe0d 3688 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3689 if (ifa->idev == idev) {
c15b1cca 3690 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3691 /* combined flag + permanent flag decide if
3692 * address is retained on a down event
3693 */
3694 if (!keep_addr ||
70af921d
DA		 3695 !(ifa->flags & IFA_F_PERMANENT) ||
3696 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3697 hlist_del_init_rcu(&ifa->addr_lst);
3698 goto restart;
3699 }
73a8bd74
DM		 3700 }
3701 }
3702 spin_unlock_bh(&addrconf_hash_lock);
3703 }
3704
1da177e4
LT		 3705 write_lock_bh(&idev->lock);
3706
b7b1bfce
HFS		 3707 addrconf_del_rs_timer(idev);
3708
bcdd553f 3709 /* Step 2: clear flags for stateless addrconf */
439e2385 3710 if (!how)
3c21edbd 3711 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3712
bcdd553f 3713 /* Step 3: clear tempaddr list */
372e6c8f 3714 while (!list_empty(&idev->tempaddr_list)) {
3715 ifa = list_first_entry(&idev->tempaddr_list,
3716 struct inet6_ifaddr, tmp_list);
3717 list_del(&ifa->tmp_list);
1da177e4
LT		 3718 write_unlock_bh(&idev->lock);
3719 spin_lock_bh(&ifa->lock);
3720
3721 if (ifa->ifpub) {
3722 in6_ifa_put(ifa->ifpub);
3723 ifa->ifpub = NULL;
3724 }
3725 spin_unlock_bh(&ifa->lock);
3726 in6_ifa_put(ifa);
3727 write_lock_bh(&idev->lock);
3728 }
8f37ada5 3729
f1705ec1 3730 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
8d1c802b 3731 struct fib6_info *rt = NULL;
a2d6cbb0 3732 bool keep;
38bd10c4 3733
f1705ec1 3734 addrconf_del_dad_work(ifa);
84e8b803 3735
a2d6cbb0
RV		 3736 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3737 !addr_is_local(&ifa->addr);
a2d6cbb0 3738
73a8bd74 3739 write_unlock_bh(&idev->lock);
8e8e676d 3740 spin_lock_bh(&ifa->lock);
f1705ec1 3741
a2d6cbb0 3742 if (keep) {
f1705ec1
DA		 3743 /* set state to skip the notifier below */
3744 state = INET6_IFADDR_STATE_DEAD;
6d717134 3745 ifa->state = INET6_IFADDR_STATE_PREDAD;
f1705ec1
DA		 3746 if (!(ifa->flags & IFA_F_NODAD))
3747 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3748
3749 rt = ifa->rt;
3750 ifa->rt = NULL;
f1705ec1
DA		 3751 } else {
3752 state = ifa->state;
3753 ifa->state = INET6_IFADDR_STATE_DEAD;
f1705ec1
DA		 3754 }
3755
8e8e676d 3756 spin_unlock_bh(&ifa->lock);
9d82ca98 3757
38bd10c4 3758 if (rt)
afb1d4b5 3759 ip6_del_rt(net, rt);
38bd10c4 3760
73a8bd74
DM		 3761 if (state != INET6_IFADDR_STATE_DEAD) {
3762 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3763 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
ea06f717
MM		 3764 } else {
3765 if (idev->cnf.forwarding)
3766 addrconf_leave_anycast(ifa);
3767 addrconf_leave_solict(ifa->idev, &ifa->addr);
27bdb2ab 3768 }
8f37ada5 3769
73a8bd74 3770 write_lock_bh(&idev->lock);
8ef802aa
ED		 3771 if (!keep) {
3772 list_del_rcu(&ifa->if_list);
3773 in6_ifa_put(ifa);
3774 }
73a8bd74 3775 }
8f37ada5 3776
1da177e4
LT		 3777 write_unlock_bh(&idev->lock);
3778
381f4dca
SD		 3779 /* Step 5: Discard anycast and multicast list */
3780 if (how) {
3781 ipv6_ac_destroy_dev(idev);
1da177e4 3782 ipv6_mc_destroy_dev(idev);
381f4dca 3783 } else {
1da177e4 3784 ipv6_mc_down(idev);
381f4dca 3785 }
1da177e4 3786
1da177e4 3787 idev->tstamp = jiffies;
1ab1457c 3788
bcdd553f 3789 /* Last: Shot the device (if unregistered) */
439e2385 3790 if (how) {
408c4768 3791 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3792 neigh_parms_release(&nd_tbl, idev->nd_parms);
3793 neigh_ifdown(&nd_tbl, dev);
3794 in6_dev_put(idev);
3795 }
3796 return 0;
3797}
3798
e99e88a9 3799static void addrconf_rs_timer(struct timer_list *t)
1da177e4 3800{
e99e88a9 3801 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
caf92bc4 3802 struct net_device *dev = idev->dev;
b7b1bfce 3803 struct in6_addr lladdr;
1da177e4 3804
b7b1bfce 3805 write_lock(&idev->lock);
5b2a1953 3806 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3807 goto out;
3808
9ba2add3 3809 if (!ipv6_accept_ra(idev))
5b2a1953 3810 goto out;
3811
3812 /* Announcement received after solicitation was sent */
3813 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3814 goto out;
1da177e4 3815
bd11f074 3816 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
caf92bc4
CW		 3817 write_unlock(&idev->lock);
3818 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3819 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3820 &in6addr_linklocal_allrouters);
3821 else
caf92bc4 3822 goto put;
1da177e4 3823
caf92bc4 3824 write_lock(&idev->lock);
bd11f074
MŻ		 3825 idev->rs_interval = rfc3315_s14_backoff_update(
3826 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
b7b1bfce
HFS		 3827 /* The wait after the last probe can be shorter */
3828 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3829 idev->cnf.rtr_solicits) ?
3830 idev->cnf.rtr_solicit_delay :
bd11f074 3831 idev->rs_interval);
1da177e4 3832 } else {
1da177e4
LT		 3833 /*
3834 * Note: we do not support deprecated "all on-link"
3835 * assumption any longer.
3836 */
91df42be 3837 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3838 }
3839
3840out:
b7b1bfce 3841 write_unlock(&idev->lock);
caf92bc4 3842put:
b7b1bfce 3843 in6_dev_put(idev);
1da177e4
LT		 3844}
3845
3846/*
3847 * Duplicate Address Detection
3848 */
3c21edbd
YH		 3849static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3850{
3851 unsigned long rand_num;
3852 struct inet6_dev *idev = ifp->idev;
adc176c5 3853 u64 nonce;
3c21edbd 3854
95c385b4
NH		 3855 if (ifp->flags & IFA_F_OPTIMISTIC)
3856 rand_num = 0;
3857 else
63862b5b 3858 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3859
adc176c5
EN		 3860 nonce = 0;
3861 if (idev->cnf.enhanced_dad ||
3862 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3863 do
3864 get_random_bytes(&nonce, 6);
3865 while (nonce == 0);
3866 }
3867 ifp->dad_nonce = nonce;
b7b1bfce 3868 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3869 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3870}
3871
c15b1cca 3872static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3873{
3874 struct inet6_dev *idev = ifp->idev;
3875 struct net_device *dev = idev->dev;
764d3be6 3876 bool bump_id, notify = false;
afb1d4b5 3877 struct net *net;
1da177e4
LT		 3878
3879 addrconf_join_solict(dev, &ifp->addr);
3880
63862b5b 3881 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3882
3883 read_lock_bh(&idev->lock);
622ccdf1 3884 spin_lock(&ifp->lock);
e9d3e084 3885 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3886 goto out;
1da177e4 3887
afb1d4b5 3888 net = dev_net(dev);
1da177e4 3889 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
afb1d4b5 3890 (net->ipv6.devconf_all->accept_dad < 1 &&
a2d3f3e3 3891 idev->cnf.accept_dad < 1) ||
55ebaef1
NT		 3892 !(ifp->flags&IFA_F_TENTATIVE) ||
3893 ifp->flags & IFA_F_NODAD) {
c76fe2d9
DA		 3894 bool send_na = false;
3895
3896 if (ifp->flags & IFA_F_TENTATIVE &&
3897 !(ifp->flags & IFA_F_OPTIMISTIC))
3898 send_na = true;
764d3be6 3899 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3900 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3901 spin_unlock(&ifp->lock);
1da177e4
LT		 3902 read_unlock_bh(&idev->lock);
3903
c76fe2d9 3904 addrconf_dad_completed(ifp, bump_id, send_na);
1da177e4
LT		 3905 return;
3906 }
3907
6732bade 3908 if (!(idev->if_flags & IF_READY)) {
21809faf 3909 spin_unlock(&ifp->lock);
6732bade 3910 read_unlock_bh(&idev->lock);
3c21edbd 3911 /*
590a9887 3912 * If the device is not ready:
3c21edbd
YH		 3913 * - keep it tentative if it is a permanent address.
3914 * - otherwise, kill it.
3915 */
3916 in6_ifa_hold(ifp);
cc411d0b 3917 addrconf_dad_stop(ifp, 0);
6732bade 3918 return;
3c21edbd 3919 }
95c385b4
NH		 3920
3921 /*
3922 * Optimistic nodes can start receiving
3923 * Frames right away
3924 */
7fd2561e 3925 if (ifp->flags & IFA_F_OPTIMISTIC) {
afb1d4b5
DA		 3926 ip6_ins_rt(net, ifp->rt);
3927 if (ipv6_use_optimistic_addr(net, idev)) {
7fd2561e
EK		 3928 /* Because optimistic nodes can use this address,
3929 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3930 */
16186a82 3931 notify = true;
7fd2561e
EK		 3932 }
3933 }
95c385b4 3934
6732bade 3935 addrconf_dad_kick(ifp);
1da177e4 3936out:
622ccdf1 3937 spin_unlock(&ifp->lock);
1da177e4 3938 read_unlock_bh(&idev->lock);
16186a82
SAK		 3939 if (notify)
3940 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 3941}
3942
c15b1cca 3943static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3944{
c15b1cca
HFS		 3945 bool begin_dad = false;
3946
8e8e676d 3947 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3948 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3949 ifp->state = INET6_IFADDR_STATE_PREDAD;
3950 begin_dad = true;
3951 }
8e8e676d 3952 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3953
3954 if (begin_dad)
3955 addrconf_mod_dad_work(ifp, 0);
3956}
3957
3958static void addrconf_dad_work(struct work_struct *w)
3959{
3960 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3961 struct inet6_ifaddr,
3962 dad_work);
1da177e4 3963 struct inet6_dev *idev = ifp->idev;
764d3be6 3964 bool bump_id, disable_ipv6 = false;
1da177e4
LT		 3965 struct in6_addr mcaddr;
3966
c15b1cca
HFS		 3967 enum {
3968 DAD_PROCESS,
3969 DAD_BEGIN,
3970 DAD_ABORT,
3971 } action = DAD_PROCESS;
3972
3973 rtnl_lock();
3974
8e8e676d 3975 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3976 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3977 action = DAD_BEGIN;
3978 ifp->state = INET6_IFADDR_STATE_DAD;
3979 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3980 action = DAD_ABORT;
3981 ifp->state = INET6_IFADDR_STATE_POSTDAD;
85b51b12 3982
35e015e1
MC		 3983 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
3984 idev->cnf.accept_dad > 1) &&
3985 !idev->cnf.disable_ipv6 &&
85b51b12
MM		 3986 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3987 struct in6_addr addr;
3988
3989 addr.s6_addr32[0] = htonl(0xfe800000);
3990 addr.s6_addr32[1] = 0;
3991
3992 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3993 ipv6_addr_equal(&ifp->addr, &addr)) {
3994 /* DAD failed for link-local based on MAC */
3995 idev->cnf.disable_ipv6 = 1;
3996
3997 pr_info("%s: IPv6 being disabled!\n",
3998 ifp->idev->dev->name);
3999 disable_ipv6 = true;
4000 }
4001 }
c15b1cca 4002 }
8e8e676d 4003 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 4004
4005 if (action == DAD_BEGIN) {
4006 addrconf_dad_begin(ifp);
4007 goto out;
4008 } else if (action == DAD_ABORT) {
751eb6b6 4009 in6_ifa_hold(ifp);
c15b1cca 4010 addrconf_dad_stop(ifp, 1);
85b51b12
MM		 4011 if (disable_ipv6)
4012 addrconf_ifdown(idev->dev, 0);
c15b1cca
HFS		 4013 goto out;
4014 }
4015
b7b1bfce 4016 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 4017 goto out;
4018
c15b1cca 4019 write_lock_bh(&idev->lock);
122e4519 4020 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 4021 write_unlock_bh(&idev->lock);
1da177e4
LT		 4022 goto out;
4023 }
21809faf 4024
4025 spin_lock(&ifp->lock);
622ccdf1
HX		 4026 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4027 spin_unlock(&ifp->lock);
c15b1cca 4028 write_unlock_bh(&idev->lock);
622ccdf1
HX		 4029 goto out;
4030 }
4031
b7b1bfce 4032 if (ifp->dad_probes == 0) {
c76fe2d9
DA		 4033 bool send_na = false;
4034
1da177e4
LT		 4035 /*
4036 * DAD was successful
4037 */
4038
c76fe2d9
DA		 4039 if (ifp->flags & IFA_F_TENTATIVE &&
4040 !(ifp->flags & IFA_F_OPTIMISTIC))
4041 send_na = true;
764d3be6 4042 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 4043 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 4044 spin_unlock(&ifp->lock);
c15b1cca 4045 write_unlock_bh(&idev->lock);
1da177e4 4046
c76fe2d9 4047 addrconf_dad_completed(ifp, bump_id, send_na);
1da177e4
LT		 4048
4049 goto out;
4050 }
4051
b7b1bfce 4052 ifp->dad_probes--;
c15b1cca
HFS		 4053 addrconf_mod_dad_work(ifp,
4054 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 4055 spin_unlock(&ifp->lock);
c15b1cca 4056 write_unlock_bh(&idev->lock);
1da177e4
LT		 4057
4058 /* send a neighbour solicitation for our addr */
1da177e4 4059 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
adc176c5
EN		 4060 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4061 ifp->dad_nonce);
1da177e4
LT		 4062out:
4063 in6_ifa_put(ifp);
c15b1cca 4064 rtnl_unlock();
1da177e4
LT		 4065}
4066
11ffff75
HFS		 4067/* ifp->idev must be at least read locked */
4068static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4069{
4070 struct inet6_ifaddr *ifpiter;
4071 struct inet6_dev *idev = ifp->idev;
4072
602582ca
HFS		 4073 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4074 if (ifpiter->scope > IFA_LINK)
4075 break;
11ffff75
HFS		 4076 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4077 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4078 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4079 IFA_F_PERMANENT)
4080 return false;
4081 }
4082 return true;
4083}
4084
c76fe2d9
DA		 4085static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4086 bool send_na)
1da177e4 4087{
e21e8467 4088 struct net_device *dev = ifp->idev->dev;
b7b1bfce 4089 struct in6_addr lladdr;
b173ee48 4090 bool send_rs, send_mld;
b7b1bfce 4091
c15b1cca 4092 addrconf_del_dad_work(ifp);
1da177e4
LT		 4093
4094 /*
4095 * Configure the address for reception. Now it is valid.
4096 */
4097
4098 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4099
026359bc
TA		 4100 /* If added prefix is link local and we are prepared to process
4101 router advertisements, start sending router solicitations.
1da177e4
LT		 4102 */
4103
1ec047eb 4104 read_lock_bh(&ifp->idev->lock);
11ffff75 4105 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 4106 send_rs = send_mld &&
4107 ipv6_accept_ra(ifp->idev) &&
bd11f074 4108 ifp->idev->cnf.rtr_solicits != 0 &&
b173ee48 4109 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 4110 read_unlock_bh(&ifp->idev->lock);
4111
b173ee48
HFS		 4112 /* While dad is in progress mld report's source address is in6_addrany.
4113 * Resend with proper ll now.
4114 */
4115 if (send_mld)
4116 ipv6_mc_dad_complete(ifp->idev);
4117
c76fe2d9
DA		 4118 /* send unsolicited NA if enabled */
4119 if (send_na &&
4120 (ifp->idev->cnf.ndisc_notify ||
4121 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4122 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4123 /*router=*/ !!ifp->idev->cnf.forwarding,
4124 /*solicited=*/ false, /*override=*/ true,
4125 /*inc_opt=*/ true);
4126 }
4127
1ec047eb 4128 if (send_rs) {
1da177e4
LT		 4129 /*
4130 * If a host as already performed a random delay
4131 * [...] as part of DAD [...] there is no need
4132 * to delay again before sending the first RS
4133 */
1ec047eb 4134 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 4135 return;
1ec047eb 4136 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 4137
b7b1bfce
HFS		 4138 write_lock_bh(&ifp->idev->lock);
4139 spin_lock(&ifp->lock);
bd11f074
MŻ		 4140 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4141 ifp->idev->cnf.rtr_solicit_interval);
b7b1bfce 4142 ifp->idev->rs_probes = 1;
1da177e4 4143 ifp->idev->if_flags |= IF_RS_SENT;
bd11f074 4144 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
b7b1bfce
HFS		 4145 spin_unlock(&ifp->lock);
4146 write_unlock_bh(&ifp->idev->lock);
1da177e4 4147 }
764d3be6
PA		 4148
4149 if (bump_id)
4150 rt_genid_bump_ipv6(dev_net(dev));
a11a7f71
MH		 4151
4152 /* Make sure that a new temporary address will be created
4153 * before this temporary address becomes deprecated.
4154 */
4155 if (ifp->flags & IFA_F_TEMPORARY)
4156 addrconf_verify_rtnl();
1da177e4
LT		 4157}
4158
e21e8467
SH		 4159static void addrconf_dad_run(struct inet6_dev *idev)
4160{
c5e33bdd
YH		 4161 struct inet6_ifaddr *ifp;
4162
4163 read_lock_bh(&idev->lock);
502a2ffd 4164 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 4165 spin_lock(&ifp->lock);
f2344a13
HX		 4166 if (ifp->flags & IFA_F_TENTATIVE &&
4167 ifp->state == INET6_IFADDR_STATE_DAD)
4168 addrconf_dad_kick(ifp);
21809faf 4169 spin_unlock(&ifp->lock);
c5e33bdd
YH		 4170 }
4171 read_unlock_bh(&idev->lock);
4172}
4173
1da177e4
LT		 4174#ifdef CONFIG_PROC_FS
4175struct if6_iter_state {
3c40090a 4176 struct seq_net_private p;
1da177e4 4177 int bucket;
1d578303 4178 int offset;
1da177e4
LT		 4179};
4180
1d578303 4181static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4 4182{
1da177e4 4183 struct if6_iter_state *state = seq->private;
1218854a 4184 struct net *net = seq_file_net(seq);
a5c1d98f 4185 struct inet6_ifaddr *ifa = NULL;
1d578303 4186 int p = 0;
1da177e4 4187
1d578303
MM		 4188 /* initial bucket if pos is 0 */
4189 if (pos == 0) {
4190 state->bucket = 0;
4191 state->offset = 0;
4192 }
4193
4194 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
a5c1d98f 4195 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
1d578303 4196 addr_lst) {
9f0d3c27
ED		 4197 if (!net_eq(dev_net(ifa->idev->dev), net))
4198 continue;
1d578303
MM		 4199 /* sync with offset */
4200 if (p < state->offset) {
4201 p++;
4202 continue;
4203 }
4204 state->offset++;
9f0d3c27 4205 return ifa;
1d578303
MM		 4206 }
4207
4208 /* prepare for next bucket */
4209 state->offset = 0;
4210 p = 0;
1da177e4 4211 }
c2e21293 4212 return NULL;
1da177e4
LT		 4213}
4214
c2e21293 4215static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4216 struct inet6_ifaddr *ifa)
1da177e4
LT		 4217{
4218 struct if6_iter_state *state = seq->private;
1218854a 4219 struct net *net = seq_file_net(seq);
1da177e4 4220
a5c1d98f 4221 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
9f0d3c27
ED		 4222 if (!net_eq(dev_net(ifa->idev->dev), net))
4223 continue;
1d578303 4224 state->offset++;
9f0d3c27 4225 return ifa;
1d578303 4226 }
3c40090a 4227
c2e21293 4228 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 4229 state->offset = 0;
a5c1d98f 4230 hlist_for_each_entry_rcu(ifa,
c2e21293 4231 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 4232 if (!net_eq(dev_net(ifa->idev->dev), net))
4233 continue;
1d578303 4234 state->offset++;
9f0d3c27 4235 return ifa;
c2e21293 4236 }
1da177e4 4237 }
3c40090a 4238
c2e21293 4239 return NULL;
1da177e4
LT		 4240}
4241
1da177e4 4242static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
a5c1d98f 4243 __acquires(rcu)
1da177e4 4244{
a5c1d98f 4245 rcu_read_lock();
1d578303 4246 return if6_get_first(seq, *pos);
1da177e4
LT		 4247}
4248
4249static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4250{
4251 struct inet6_ifaddr *ifa;
4252
4253 ifa = if6_get_next(seq, v);
4254 ++*pos;
4255 return ifa;
4256}
4257
4258static void if6_seq_stop(struct seq_file *seq, void *v)
a5c1d98f 4259 __releases(rcu)
1da177e4 4260{
a5c1d98f 4261 rcu_read_unlock();
1da177e4
LT		 4262}
4263
4264static int if6_seq_show(struct seq_file *seq, void *v)
4265{
4266 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4267 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4268 &ifp->addr,
1da177e4
LT		 4269 ifp->idev->dev->ifindex,
4270 ifp->prefix_len,
4271 ifp->scope,
971a351c 4272 (u8) ifp->flags,
1da177e4
LT		 4273 ifp->idev->dev->name);
4274 return 0;
4275}
4276
56b3d975 4277static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4278 .start = if6_seq_start,
4279 .next = if6_seq_next,
4280 .show = if6_seq_show,
4281 .stop = if6_seq_stop,
4282};
4283
2c8c1e72 4284static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4285{
c3506372
CH		 4286 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4287 sizeof(struct if6_iter_state)))
1da177e4
LT		 4288 return -ENOMEM;
4289 return 0;
4290}
4291
2c8c1e72 4292static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4293{
ece31ffd 4294 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4295}
4296
4297static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4298 .init = if6_proc_net_init,
4299 .exit = if6_proc_net_exit,
3c40090a
DL		 4300};
4301
4302int __init if6_proc_init(void)
4303{
4304 return register_pernet_subsys(&if6_proc_net_ops);
4305}
4306
1da177e4
LT		 4307void if6_proc_exit(void)
4308{
3c40090a 4309 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4310}
4311#endif /* CONFIG_PROC_FS */
4312
07a93626 4313#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4314/* Check if address is a home address configured on any interface. */
b71d1d42 4315int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c 4316{
3f27fb23 4317 unsigned int hash = inet6_addr_hash(net, addr);
c2e21293 4318 struct inet6_ifaddr *ifp = NULL;
3f27fb23 4319 int ret = 0;
c2e21293 4320
4e5f47ab
ED		 4321 rcu_read_lock();
4322 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 4323 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 4324 continue;
caad295f 4325 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4326 (ifp->flags & IFA_F_HOMEADDRESS)) {
4327 ret = 1;
4328 break;
4329 }
4330 }
4e5f47ab 4331 rcu_read_unlock();
3b9f9a1c
NT		 4332 return ret;
4333}
4334#endif
4335
1da177e4
LT		 4336/*
4337 * Periodic address status verification
4338 */
4339
c15b1cca 4340static void addrconf_verify_rtnl(void)
1da177e4 4341{
b2db7564 4342 unsigned long now, next, next_sec, next_sched;
1da177e4 4343 struct inet6_ifaddr *ifp;
1da177e4
LT		 4344 int i;
4345
c15b1cca
HFS		 4346 ASSERT_RTNL();
4347
5c578aed 4348 rcu_read_lock_bh();
1da177e4 4349 now = jiffies;
b2db7564 4350 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4351
c15b1cca 4352 cancel_delayed_work(&addr_chk_work);
1da177e4 4353
bcdd553f 4354 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4355restart:
c15b1cca 4356 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 4357 unsigned long age;
1da177e4 4358
fad8da3e
YA		 4359 /* When setting preferred_lft to a value not zero or
4360 * infinity, while valid_lft is infinity
4361 * IFA_F_PERMANENT has a non-infinity life time.
4362 */
4363 if ((ifp->flags & IFA_F_PERMANENT) &&
4364 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4365 continue;
4366
4367 spin_lock(&ifp->lock);
b2db7564
YH		 4368 /* We try to batch several events at once. */
4369 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4370
8f27ebb9
YH		 4371 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4372 age >= ifp->valid_lft) {
1da177e4
LT		 4373 spin_unlock(&ifp->lock);
4374 in6_ifa_hold(ifp);
1da177e4
LT		 4375 ipv6_del_addr(ifp);
4376 goto restart;
8f27ebb9
YH		 4377 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4378 spin_unlock(&ifp->lock);
4379 continue;
1da177e4 4380 } else if (age >= ifp->prefered_lft) {
a1ed0526 4381 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4382 int deprecate = 0;
4383
4384 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4385 deprecate = 1;
4386 ifp->flags |= IFA_F_DEPRECATED;
4387 }
4388
fad8da3e
YA		 4389 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4390 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4391 next = ifp->tstamp + ifp->valid_lft * HZ;
4392
4393 spin_unlock(&ifp->lock);
4394
4395 if (deprecate) {
4396 in6_ifa_hold(ifp);
1da177e4
LT		 4397
4398 ipv6_ifa_notify(0, ifp);
4399 in6_ifa_put(ifp);
4400 goto restart;
4401 }
1da177e4
LT		 4402 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4403 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4404 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4405 ifp->idev->cnf.dad_transmits *
1f9248e5 4406 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 4407
1da177e4
LT		 4408 if (age >= ifp->prefered_lft - regen_advance) {
4409 struct inet6_ifaddr *ifpub = ifp->ifpub;
4410 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4411 next = ifp->tstamp + ifp->prefered_lft * HZ;
4412 if (!ifp->regen_count && ifpub) {
4413 ifp->regen_count++;
4414 in6_ifa_hold(ifp);
4415 in6_ifa_hold(ifpub);
4416 spin_unlock(&ifp->lock);
5c578aed 4417
291d809b
HY		 4418 spin_lock(&ifpub->lock);
4419 ifpub->regen_count = 0;
4420 spin_unlock(&ifpub->lock);
e64e469b 4421 rcu_read_unlock_bh();
fffcefe9 4422 ipv6_create_tempaddr(ifpub, ifp, true);
1da177e4
LT		 4423 in6_ifa_put(ifpub);
4424 in6_ifa_put(ifp);
e64e469b 4425 rcu_read_lock_bh();
1da177e4
LT		 4426 goto restart;
4427 }
4428 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4429 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4430 spin_unlock(&ifp->lock);
1da177e4
LT		 4431 } else {
4432 /* ifp->prefered_lft <= ifp->valid_lft */
4433 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4434 next = ifp->tstamp + ifp->prefered_lft * HZ;
4435 spin_unlock(&ifp->lock);
4436 }
4437 }
1da177e4
LT		 4438 }
4439
b2db7564
YH		 4440 next_sec = round_jiffies_up(next);
4441 next_sched = next;
4442
4443 /* If rounded timeout is accurate enough, accept it. */
4444 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4445 next_sched = next_sec;
4446
4447 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4448 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4449 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4450
e32ac250
JP		 4451 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4452 now, next, next_sec, next_sched);
c15b1cca 4453 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4454 rcu_read_unlock_bh();
1da177e4
LT		 4455}
4456
c15b1cca
HFS		 4457static void addrconf_verify_work(struct work_struct *w)
4458{
4459 rtnl_lock();
4460 addrconf_verify_rtnl();
4461 rtnl_unlock();
4462}
4463
4464static void addrconf_verify(void)
4465{
4466 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4467}
4468
caeaba79
ND		 4469static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4470 struct in6_addr **peer_pfx)
461d8837
TG		 4471{
4472 struct in6_addr *pfx = NULL;
4473
caeaba79
ND		 4474 *peer_pfx = NULL;
4475
461d8837
TG		 4476 if (addr)
4477 pfx = nla_data(addr);
4478
4479 if (local) {
4480 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4481 *peer_pfx = pfx;
4482 pfx = nla_data(local);
461d8837
TG		 4483 }
4484
4485 return pfx;
4486}
4487
ef7c79ed 4488static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4489 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4490 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4491 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4492 [IFA_FLAGS] = { .len = sizeof(u32) },
8308f3ff 4493 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
461d8837
TG		 4494};
4495
1da177e4 4496static int
c21ef3e3
DA		 4497inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4498 struct netlink_ext_ack *extack)
1da177e4 4499{
3b1e0a65 4500 struct net *net = sock_net(skb->sk);
b933f716
TG		 4501 struct ifaddrmsg *ifm;
4502 struct nlattr *tb[IFA_MAX+1];
caeaba79 4503 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4504 u32 ifa_flags;
b933f716 4505 int err;
1da177e4 4506
fceb6435 4507 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4508 extack);
b933f716
TG		 4509 if (err < 0)
4510 return err;
4511
4512 ifm = nlmsg_data(nlh);
caeaba79 4513 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4514 if (!pfx)
1da177e4
LT		 4515 return -EINVAL;
4516
6046d5b4
HK		 4517 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4518
4519 /* We ignore other flags so far. */
4520 ifa_flags &= IFA_F_MANAGETEMPADDR;
4521
4522 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4523 ifm->ifa_prefixlen);
1da177e4
LT		 4524}
4525
8308f3ff
DA		 4526static int modify_prefix_route(struct inet6_ifaddr *ifp,
4527 unsigned long expires, u32 flags)
4528{
4529 struct fib6_info *f6i;
e7c7faa9 4530 u32 prio;
8308f3ff
DA		 4531
4532 f6i = addrconf_get_prefix_route(&ifp->addr,
4533 ifp->prefix_len,
4534 ifp->idev->dev,
4535 0, RTF_GATEWAY | RTF_DEFAULT);
4536 if (!f6i)
4537 return -ENOENT;
4538
e7c7faa9
DA		 4539 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4540 if (f6i->fib6_metric != prio) {
4541 /* delete old one */
4542 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
4543
8308f3ff
DA		 4544 /* add new one */
4545 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4546 ifp->rt_priority, ifp->idev->dev,
4547 expires, flags, GFP_KERNEL);
8308f3ff
DA		 4548 } else {
4549 if (!expires)
4550 fib6_clean_expires(f6i);
4551 else
4552 fib6_set_expires(f6i, expires);
4553
4554 fib6_info_release(f6i);
4555 }
4556
4557 return 0;
4558}
4559
d169a1f8 4560static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
081bba5b 4561{
6f704992
YH		 4562 u32 flags;
4563 clock_t expires;
4bed72e4 4564 unsigned long timeout;
53bd6749 4565 bool was_managetempaddr;
5b84efec 4566 bool had_prefixroute;
46d48046 4567
c15b1cca
HFS		 4568 ASSERT_RTNL();
4569
d169a1f8 4570 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
081bba5b
NT		 4571 return -EINVAL;
4572
d169a1f8 4573 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
53bd6749
JP		 4574 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4575 return -EINVAL;
4576
f1c02cfb 4577 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
d169a1f8 4578 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
f1c02cfb 4579
d169a1f8 4580 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4bed72e4
YH		 4581 if (addrconf_finite_timeout(timeout)) {
4582 expires = jiffies_to_clock_t(timeout * HZ);
d169a1f8 4583 cfg->valid_lft = timeout;
6f704992 4584 flags = RTF_EXPIRES;
4bed72e4
YH		 4585 } else {
4586 expires = 0;
4587 flags = 0;
d169a1f8 4588 cfg->ifa_flags |= IFA_F_PERMANENT;
6f704992 4589 }
081bba5b 4590
d169a1f8 4591 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4bed72e4
YH		 4592 if (addrconf_finite_timeout(timeout)) {
4593 if (timeout == 0)
d169a1f8
DA		 4594 cfg->ifa_flags |= IFA_F_DEPRECATED;
4595 cfg->preferred_lft = timeout;
4bed72e4 4596 }
081bba5b
NT		 4597
4598 spin_lock_bh(&ifp->lock);
53bd6749 4599 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4600 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4601 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4602 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4603 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4604 IFA_F_NOPREFIXROUTE);
d169a1f8 4605 ifp->flags |= cfg->ifa_flags;
081bba5b 4606 ifp->tstamp = jiffies;
d169a1f8
DA		 4607 ifp->valid_lft = cfg->valid_lft;
4608 ifp->prefered_lft = cfg->preferred_lft;
081bba5b 4609
8308f3ff
DA		 4610 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4611 ifp->rt_priority = cfg->rt_priority;
081bba5b
NT		 4612
4613 spin_unlock_bh(&ifp->lock);
4614 if (!(ifp->flags&IFA_F_TENTATIVE))
4615 ipv6_ifa_notify(0, ifp);
081bba5b 4616
d169a1f8 4617 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
8308f3ff
DA		 4618 int rc = -ENOENT;
4619
4620 if (had_prefixroute)
4621 rc = modify_prefix_route(ifp, expires, flags);
4622
4623 /* prefix route could have been deleted; if so restore it */
4624 if (rc == -ENOENT) {
4625 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4626 ifp->rt_priority, ifp->idev->dev,
4627 expires, flags, GFP_KERNEL);
4628 }
5b84efec
TH		 4629 } else if (had_prefixroute) {
4630 enum cleanup_prefix_rt_t action;
4631 unsigned long rt_expires;
4632
4633 write_lock_bh(&ifp->idev->lock);
4634 action = check_cleanup_prefix_route(ifp, &rt_expires);
4635 write_unlock_bh(&ifp->idev->lock);
4636
4637 if (action != CLEANUP_PREFIX_RT_NOP) {
4638 cleanup_prefix_route(ifp, rt_expires,
4639 action == CLEANUP_PREFIX_RT_DEL);
4640 }
761aac73 4641 }
53bd6749
JP		 4642
4643 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
d169a1f8
DA		 4644 if (was_managetempaddr &&
4645 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4646 cfg->valid_lft = 0;
4647 cfg->preferred_lft = 0;
4648 }
4649 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4650 cfg->preferred_lft, !was_managetempaddr,
4651 jiffies);
53bd6749
JP		 4652 }
4653
c15b1cca 4654 addrconf_verify_rtnl();
081bba5b
NT		 4655
4656 return 0;
4657}
4658
1da177e4 4659static int
c21ef3e3
DA		 4660inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4661 struct netlink_ext_ack *extack)
1da177e4 4662{
3b1e0a65 4663 struct net *net = sock_net(skb->sk);
461d8837
TG		 4664 struct ifaddrmsg *ifm;
4665 struct nlattr *tb[IFA_MAX+1];
19b1518c 4666 struct in6_addr *peer_pfx;
7198f8ce
TG		 4667 struct inet6_ifaddr *ifa;
4668 struct net_device *dev;
f1c02cfb 4669 struct inet6_dev *idev;
19b1518c 4670 struct ifa6_config cfg;
461d8837 4671 int err;
1da177e4 4672
fceb6435 4673 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4674 extack);
461d8837
TG		 4675 if (err < 0)
4676 return err;
4677
19b1518c
DA		 4678 memset(&cfg, 0, sizeof(cfg));
4679
461d8837 4680 ifm = nlmsg_data(nlh);
19b1518c
DA		 4681 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4682 if (!cfg.pfx)
1da177e4
LT		 4683 return -EINVAL;
4684
19b1518c
DA		 4685 cfg.peer_pfx = peer_pfx;
4686 cfg.plen = ifm->ifa_prefixlen;
8308f3ff
DA		 4687 if (tb[IFA_RT_PRIORITY])
4688 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4689
19b1518c
DA		 4690 cfg.valid_lft = INFINITY_LIFE_TIME;
4691 cfg.preferred_lft = INFINITY_LIFE_TIME;
4692
461d8837 4693 if (tb[IFA_CACHEINFO]) {
0778769d 4694 struct ifa_cacheinfo *ci;
461d8837
TG		 4695
4696 ci = nla_data(tb[IFA_CACHEINFO]);
19b1518c
DA		 4697 cfg.valid_lft = ci->ifa_valid;
4698 cfg.preferred_lft = ci->ifa_prefered;
0778769d
NT		 4699 }
4700
af284937 4701 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4702 if (!dev)
7198f8ce
TG		 4703 return -ENODEV;
4704
19b1518c
DA		 4705 if (tb[IFA_FLAGS])
4706 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4707 else
4708 cfg.ifa_flags = ifm->ifa_flags;
479840ff 4709
55ebaef1 4710 /* We ignore other flags so far. */
19b1518c
DA		 4711 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4712 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4713 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
f1c02cfb
SD		 4714
4715 idev = ipv6_find_idev(dev);
4716 if (IS_ERR(idev))
4717 return PTR_ERR(idev);
4718
4719 if (!ipv6_allow_optimistic_dad(net, idev))
19b1518c 4720 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
f1c02cfb 4721
19b1518c
DA		 4722 if (cfg.ifa_flags & IFA_F_NODAD &&
4723 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
f1c02cfb
SD		 4724 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4725 return -EINVAL;
4726 }
55ebaef1 4727
19b1518c 4728 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
63159f29 4729 if (!ifa) {
7198f8ce
TG		 4730 /*
4731 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4732 * userspace already relies on not having to provide this.
7198f8ce 4733 */
19b1518c 4734 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
081bba5b
NT		 4735 }
4736
7198f8ce
TG		 4737 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4738 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4739 err = -EEXIST;
4740 else
d169a1f8 4741 err = inet6_addr_modify(ifa, &cfg);
7198f8ce
TG		 4742
4743 in6_ifa_put(ifa);
4744
4745 return err;
1da177e4
LT		 4746}
4747
479840ff 4748static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4749 u8 scope, int ifindex)
4750{
4751 struct ifaddrmsg *ifm;
4752
4753 ifm = nlmsg_data(nlh);
4754 ifm->ifa_family = AF_INET6;
4755 ifm->ifa_prefixlen = prefixlen;
4756 ifm->ifa_flags = flags;
4757 ifm->ifa_scope = scope;
4758 ifm->ifa_index = ifindex;
4759}
4760
85486af0
TG		 4761static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4762 unsigned long tstamp, u32 preferred, u32 valid)
4763{
4764 struct ifa_cacheinfo ci;
4765
18a31e1e
TG		 4766 ci.cstamp = cstamp_delta(cstamp);
4767 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4768 ci.ifa_prefered = preferred;
4769 ci.ifa_valid = valid;
4770
4771 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4772}
4773
101bb229
TG		 4774static inline int rt_scope(int ifa_scope)
4775{
4776 if (ifa_scope & IFA_HOST)
4777 return RT_SCOPE_HOST;
4778 else if (ifa_scope & IFA_LINK)
4779 return RT_SCOPE_LINK;
4780 else if (ifa_scope & IFA_SITE)
4781 return RT_SCOPE_SITE;
4782 else
4783 return RT_SCOPE_UNIVERSE;
4784}
4785
0ab6803b
TG		 4786static inline int inet6_ifaddr_msgsize(void)
4787{
339bf98f 4788 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4789 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4790 + nla_total_size(16) /* IFA_ADDRESS */
479840ff 4791 + nla_total_size(sizeof(struct ifa_cacheinfo))
8308f3ff
DA		 4792 + nla_total_size(4) /* IFA_FLAGS */
4793 + nla_total_size(4) /* IFA_RT_PRIORITY */;
0ab6803b 4794}
c5396a31 4795
1da177e4 4796static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4797 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4798{
1da177e4 4799 struct nlmsghdr *nlh;
85486af0 4800 u32 preferred, valid;
1da177e4 4801
15e47304 4802 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4803 if (!nlh)
26932566 4804 return -EMSGSIZE;
0ab6803b 4805
101bb229
TG		 4806 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4807 ifa->idev->dev->ifindex);
4808
fad8da3e
YA		 4809 if (!((ifa->flags&IFA_F_PERMANENT) &&
4810 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4811 preferred = ifa->prefered_lft;
4812 valid = ifa->valid_lft;
4813 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4814 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4815 if (preferred > tval)
4816 preferred -= tval;
4817 else
4818 preferred = 0;
f56619fc
BH		 4819 if (valid != INFINITY_LIFE_TIME) {
4820 if (valid > tval)
4821 valid -= tval;
4822 else
4823 valid = 0;
4824 }
1da177e4
LT		 4825 }
4826 } else {
85486af0
TG		 4827 preferred = INFINITY_LIFE_TIME;
4828 valid = INFINITY_LIFE_TIME;
4829 }
4830
7996c799 4831 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4832 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4833 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4834 goto error;
4835 } else
930345ea 4836 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4837 goto error;
4838
8308f3ff
DA		 4839 if (ifa->rt_priority &&
4840 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
4841 goto error;
4842
caeaba79
ND		 4843 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4844 goto error;
1da177e4 4845
479840ff
JP		 4846 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4847 goto error;
4848
053c095a
JB		 4849 nlmsg_end(skb, nlh);
4850 return 0;
caeaba79
ND		 4851
4852error:
4853 nlmsg_cancel(skb, nlh);
4854 return -EMSGSIZE;
1da177e4
LT		 4855}
4856
4857static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4858 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4859{
1da177e4 4860 struct nlmsghdr *nlh;
101bb229
TG		 4861 u8 scope = RT_SCOPE_UNIVERSE;
4862 int ifindex = ifmca->idev->dev->ifindex;
4863
4864 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4865 scope = RT_SCOPE_SITE;
1da177e4 4866
15e47304 4867 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4868 if (!nlh)
26932566 4869 return -EMSGSIZE;
85486af0 4870
0ab6803b 4871 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4872 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4873 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4874 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4875 nlmsg_cancel(skb, nlh);
4876 return -EMSGSIZE;
4877 }
85486af0 4878
053c095a
JB		 4879 nlmsg_end(skb, nlh);
4880 return 0;
1da177e4
LT		 4881}
4882
4883static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4884 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4885{
9ee8cbb2
DA		 4886 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
4887 int ifindex = dev ? dev->ifindex : 1;
1da177e4 4888 struct nlmsghdr *nlh;
101bb229 4889 u8 scope = RT_SCOPE_UNIVERSE;
101bb229
TG		 4890
4891 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4892 scope = RT_SCOPE_SITE;
1da177e4 4893
15e47304 4894 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4895 if (!nlh)
26932566 4896 return -EMSGSIZE;
85486af0 4897
0ab6803b 4898 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4899 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4900 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4901 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4902 nlmsg_cancel(skb, nlh);
4903 return -EMSGSIZE;
4904 }
1da177e4 4905
053c095a
JB		 4906 nlmsg_end(skb, nlh);
4907 return 0;
1da177e4
LT		 4908}
4909
e21e8467 4910enum addr_type_t {
1da177e4
LT		 4911 UNICAST_ADDR,
4912 MULTICAST_ADDR,
4913 ANYCAST_ADDR,
4914};
4915
234b27c3
ED		 4916/* called with rcu_read_lock() */
4917static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4918 struct netlink_callback *cb, enum addr_type_t type,
4919 int s_ip_idx, int *p_ip_idx)
4920{
234b27c3
ED		 4921 struct ifmcaddr6 *ifmca;
4922 struct ifacaddr6 *ifaca;
4923 int err = 1;
4924 int ip_idx = *p_ip_idx;
4925
4926 read_lock_bh(&idev->lock);
4927 switch (type) {
502a2ffd 4928 case UNICAST_ADDR: {
4929 struct inet6_ifaddr *ifa;
4930
234b27c3 4931 /* unicast address incl. temp addr */
502a2ffd 4932 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4933 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4934 continue;
4935 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4936 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4937 cb->nlh->nlmsg_seq,
4938 RTM_NEWADDR,
4939 NLM_F_MULTI);
053c095a 4940 if (err < 0)
234b27c3 4941 break;
63998ac2 4942 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4943 }
4944 break;
502a2ffd 4945 }
234b27c3
ED		 4946 case MULTICAST_ADDR:
4947 /* multicast address */
4948 for (ifmca = idev->mc_list; ifmca;
4949 ifmca = ifmca->next, ip_idx++) {
4950 if (ip_idx < s_ip_idx)
4951 continue;
4952 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4953 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4954 cb->nlh->nlmsg_seq,
4955 RTM_GETMULTICAST,
4956 NLM_F_MULTI);
053c095a 4957 if (err < 0)
234b27c3
ED		 4958 break;
4959 }
4960 break;
4961 case ANYCAST_ADDR:
4962 /* anycast address */
4963 for (ifaca = idev->ac_list; ifaca;
4964 ifaca = ifaca->aca_next, ip_idx++) {
4965 if (ip_idx < s_ip_idx)
4966 continue;
4967 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4968 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4969 cb->nlh->nlmsg_seq,
4970 RTM_GETANYCAST,
4971 NLM_F_MULTI);
053c095a 4972 if (err < 0)
234b27c3
ED		 4973 break;
4974 }
4975 break;
4976 default:
4977 break;
4978 }
4979 read_unlock_bh(&idev->lock);
4980 *p_ip_idx = ip_idx;
4981 return err;
4982}
4983
1da177e4
LT		 4984static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4985 enum addr_type_t type)
4986{
234b27c3
ED		 4987 struct net *net = sock_net(skb->sk);
4988 int h, s_h;
1da177e4
LT		 4989 int idx, ip_idx;
4990 int s_idx, s_ip_idx;
1da177e4 4991 struct net_device *dev;
234b27c3
ED		 4992 struct inet6_dev *idev;
4993 struct hlist_head *head;
1ab1457c 4994
234b27c3
ED		 4995 s_h = cb->args[0];
4996 s_idx = idx = cb->args[1];
4997 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4998
234b27c3 4999 rcu_read_lock();
63998ac2 5000 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 5001 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5002 idx = 0;
5003 head = &net->dev_index_head[h];
b67bfe0d 5004 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 5005 if (idx < s_idx)
5006 goto cont;
4b97efdf 5007 if (h > s_h || idx > s_idx)
234b27c3
ED		 5008 s_ip_idx = 0;
5009 ip_idx = 0;
e21e8467
SH		 5010 idev = __in6_dev_get(dev);
5011 if (!idev)
234b27c3
ED		 5012 goto cont;
5013
5014 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 5015 s_ip_idx, &ip_idx) < 0)
234b27c3 5016 goto done;
7562f876 5017cont:
234b27c3
ED		 5018 idx++;
5019 }
1da177e4 5020 }
234b27c3
ED		 5021done:
5022 rcu_read_unlock();
5023 cb->args[0] = h;
5024 cb->args[1] = idx;
5025 cb->args[2] = ip_idx;
5026
1da177e4
LT		 5027 return skb->len;
5028}
5029
5030static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5031{
5032 enum addr_type_t type = UNICAST_ADDR;
b854272b 5033
1da177e4
LT		 5034 return inet6_dump_addr(skb, cb, type);
5035}
5036
5037static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5038{
5039 enum addr_type_t type = MULTICAST_ADDR;
b854272b 5040
1da177e4
LT		 5041 return inet6_dump_addr(skb, cb, type);
5042}
5043
5044
5045static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5046{
5047 enum addr_type_t type = ANYCAST_ADDR;
b854272b 5048
1da177e4
LT		 5049 return inet6_dump_addr(skb, cb, type);
5050}
5051
c21ef3e3
DA		 5052static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5053 struct netlink_ext_ack *extack)
6c223828 5054{
3b1e0a65 5055 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 5056 struct ifaddrmsg *ifm;
5057 struct nlattr *tb[IFA_MAX+1];
caeaba79 5058 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 5059 struct net_device *dev = NULL;
5060 struct inet6_ifaddr *ifa;
5061 struct sk_buff *skb;
6c223828
NT		 5062 int err;
5063
fceb6435 5064 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 5065 extack);
1b29fc2c 5066 if (err < 0)
c24675f8 5067 return err;
1b29fc2c 5068
caeaba79 5069 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
c24675f8
FW		 5070 if (!addr)
5071 return -EINVAL;
6c223828 5072
1b29fc2c 5073 ifm = nlmsg_data(nlh);
6c223828 5074 if (ifm->ifa_index)
c24675f8 5075 dev = dev_get_by_index(net, ifm->ifa_index);
6c223828 5076
e21e8467
SH		 5077 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
5078 if (!ifa) {
1b29fc2c
TG		 5079 err = -EADDRNOTAVAIL;
5080 goto errout;
5081 }
6c223828 5082
e21e8467
SH		 5083 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5084 if (!skb) {
6c223828 5085 err = -ENOBUFS;
1b29fc2c 5086 goto errout_ifa;
6c223828
NT		 5087 }
5088
15e47304 5089 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 5090 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 5091 if (err < 0) {
5092 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5093 WARN_ON(err == -EMSGSIZE);
5094 kfree_skb(skb);
5095 goto errout_ifa;
5096 }
15e47304 5097 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 5098errout_ifa:
6c223828 5099 in6_ifa_put(ifa);
1b29fc2c 5100errout:
c24675f8
FW		 5101 if (dev)
5102 dev_put(dev);
6c223828 5103 return err;
6c223828
NT		 5104}
5105
1da177e4
LT		 5106static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5107{
5108 struct sk_buff *skb;
c346dca1 5109 struct net *net = dev_net(ifa->idev->dev);
5d620266 5110 int err = -ENOBUFS;
1da177e4 5111
0ab6803b 5112 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 5113 if (!skb)
5d620266
TG		 5114 goto errout;
5115
5116 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 5117 if (err < 0) {
5118 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5119 WARN_ON(err == -EMSGSIZE);
5120 kfree_skb(skb);
5121 goto errout;
5122 }
1ce85fe4
PNA		 5123 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5124 return;
5d620266
TG		 5125errout:
5126 if (err < 0)
6fda7350 5127 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 5128}
5129
b6f99a21 5130static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 5131 __s32 *array, int bytes)
5132{
04561c1f
TG		 5133 BUG_ON(bytes < (DEVCONF_MAX * 4));
5134
1da177e4
LT		 5135 memset(array, 0, bytes);
5136 array[DEVCONF_FORWARDING] = cnf->forwarding;
5137 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5138 array[DEVCONF_MTU6] = cnf->mtu6;
5139 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5140 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5141 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5142 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5143 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 5144 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5145 jiffies_to_msecs(cnf->rtr_solicit_interval);
bd11f074
MŻ		 5146 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5147 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
93908d19
TG		 5148 array[DEVCONF_RTR_SOLICIT_DELAY] =
5149 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 5150 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 5151 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5152 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5153 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5154 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 5155 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5156 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5157 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5158 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5159 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 5160 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 5161 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 5162 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 5163 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 5164#ifdef CONFIG_IPV6_ROUTER_PREF
5165 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 5166 array[DEVCONF_RTR_PROBE_INTERVAL] =
5167 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 5168#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 5169 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
09c884d4
YH		 5170 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5171#endif
930d6ff2 5172#endif
fbea49e1 5173 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 5174 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 5175#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5176 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 5177 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 5178#endif
7bc570c8
YH		 5179#ifdef CONFIG_IPV6_MROUTE
5180 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5181#endif
778d80be 5182 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 5183 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 5184 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 5185 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 5186 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 5187 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 5188 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 5189 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 5190 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 5191 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 5192 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 5193 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 5194 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1ababeba 5195 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
bf355b8d
DL		 5196#ifdef CONFIG_IPV6_SEG6_HMAC
5197 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5198#endif
adc176c5 5199 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
d35a00b8 5200 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
df789fe7 5201 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
2210d6b2 5202 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
1da177e4
LT		 5203}
5204
b382b191
TG		 5205static inline size_t inet6_ifla6_size(void)
5206{
5207 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5208 + nla_total_size(sizeof(struct ifla_cacheinfo))
5209 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5210 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4 5211 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
bdd72f41
SD		 5212 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5213 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5214 + 0;
b382b191
TG		 5215}
5216
339bf98f
TG		 5217static inline size_t inet6_if_nlmsg_size(void)
5218{
5219 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5220 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5221 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5222 + nla_total_size(4) /* IFLA_MTU */
5223 + nla_total_size(4) /* IFLA_LINK */
0344338b 5224 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 5225 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 5226}
c5396a31 5227
be281e55 5228static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
aca05671 5229 int bytes)
7f7d9a6b
HX		 5230{
5231 int i;
aca05671 5232 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
7f7d9a6b
HX		 5233 BUG_ON(pad < 0);
5234
5235 /* Use put_unaligned() because stats may not be aligned for u64. */
aca05671
JH		 5236 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5237 for (i = 1; i < ICMP6_MIB_MAX; i++)
be281e55 5238 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b 5239
aca05671 5240 memset(&stats[ICMP6_MIB_MAX], 0, pad);
7f7d9a6b
HX		 5241}
5242
698365fa 5243static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 5244 int bytes, size_t syncpoff)
4ce3c183 5245{
a3a77372
R		 5246 int i, c;
5247 u64 buff[IPSTATS_MIB_MAX];
5248 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5249
4ce3c183
ED		 5250 BUG_ON(pad < 0);
5251
a3a77372
R		 5252 memset(buff, 0, sizeof(buff));
5253 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 5254
a3a77372
R		 5255 for_each_possible_cpu(c) {
5256 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5257 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5258 }
5259
5260 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5261 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 5262}
5263
7f7d9a6b
HX		 5264static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5265 int bytes)
5266{
e21e8467 5267 switch (attrtype) {
7f7d9a6b 5268 case IFLA_INET6_STATS:
a3a77372
R		 5269 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5270 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 5271 break;
5272 case IFLA_INET6_ICMP6STATS:
aca05671 5273 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
7f7d9a6b
HX		 5274 break;
5275 }
5276}
5277
d5566fd7
SV		 5278static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5279 u32 ext_filter_mask)
b382b191
TG		 5280{
5281 struct nlattr *nla;
5282 struct ifla_cacheinfo ci;
5283
c78679e8
DM		 5284 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5285 goto nla_put_failure;
b382b191 5286 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 5287 ci.tstamp = cstamp_delta(idev->tstamp);
5288 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 5289 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 5290 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5291 goto nla_put_failure;
b382b191 5292 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 5293 if (!nla)
b382b191
TG		 5294 goto nla_put_failure;
5295 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5296
5297 /* XXX - MC not implemented */
5298
d5566fd7
SV		 5299 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5300 return 0;
5301
b382b191 5302 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 5303 if (!nla)
b382b191
TG		 5304 goto nla_put_failure;
5305 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5306
5307 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 5308 if (!nla)
b382b191
TG		 5309 goto nla_put_failure;
5310 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5311
f53adae4 5312 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 5313 if (!nla)
f53adae4 5314 goto nla_put_failure;
bc91b0f0 5315
d35a00b8 5316 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
bc91b0f0
JP		 5317 goto nla_put_failure;
5318
f53adae4
DB		 5319 read_lock_bh(&idev->lock);
5320 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5321 read_unlock_bh(&idev->lock);
5322
b382b191
TG		 5323 return 0;
5324
5325nla_put_failure:
5326 return -EMSGSIZE;
5327}
5328
b1974ed0
AR		 5329static size_t inet6_get_link_af_size(const struct net_device *dev,
5330 u32 ext_filter_mask)
b382b191
TG		 5331{
5332 if (!__in6_dev_get(dev))
5333 return 0;
5334
5335 return inet6_ifla6_size();
5336}
5337
d5566fd7
SV		 5338static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5339 u32 ext_filter_mask)
b382b191
TG		 5340{
5341 struct inet6_dev *idev = __in6_dev_get(dev);
5342
5343 if (!idev)
5344 return -ENODATA;
5345
d5566fd7 5346 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5347 return -EMSGSIZE;
5348
5349 return 0;
5350}
5351
f53adae4
DB		 5352static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5353{
f53adae4
DB		 5354 struct inet6_ifaddr *ifp;
5355 struct net_device *dev = idev->dev;
47e27d5e 5356 bool clear_token, update_rs = false;
dc848292 5357 struct in6_addr ll_addr;
f53adae4 5358
c15b1cca
HFS		 5359 ASSERT_RTNL();
5360
63159f29 5361 if (!token)
f53adae4 5362 return -EINVAL;
f53adae4
DB		 5363 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5364 return -EINVAL;
f53adae4
DB		 5365 if (!ipv6_accept_ra(idev))
5366 return -EINVAL;
bd11f074 5367 if (idev->cnf.rtr_solicits == 0)
f53adae4
DB		 5368 return -EINVAL;
5369
5370 write_lock_bh(&idev->lock);
5371
5372 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5373 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5374
5375 write_unlock_bh(&idev->lock);
5376
47e27d5e
DB		 5377 clear_token = ipv6_addr_any(token);
5378 if (clear_token)
5379 goto update_lft;
5380
dc848292
HFS		 5381 if (!idev->dead && (idev->if_flags & IF_READY) &&
5382 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5383 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5384 /* If we're not ready, then normal ifup will take care
5385 * of this. Otherwise, we need to request our rs here.
5386 */
5387 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5388 update_rs = true;
5389 }
f53adae4 5390
47e27d5e 5391update_lft:
f53adae4 5392 write_lock_bh(&idev->lock);
fc403832 5393
77ecaace 5394 if (update_rs) {
fc403832 5395 idev->if_flags |= IF_RS_SENT;
bd11f074
MŻ		 5396 idev->rs_interval = rfc3315_s14_backoff_init(
5397 idev->cnf.rtr_solicit_interval);
77ecaace 5398 idev->rs_probes = 1;
bd11f074 5399 addrconf_mod_rs_timer(idev, idev->rs_interval);
77ecaace 5400 }
f53adae4
DB		 5401
5402 /* Well, that's kinda nasty ... */
5403 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5404 spin_lock(&ifp->lock);
617fe29d 5405 if (ifp->tokenized) {
f53adae4
DB		 5406 ifp->valid_lft = 0;
5407 ifp->prefered_lft = 0;
5408 }
5409 spin_unlock(&ifp->lock);
5410 }
5411
5412 write_unlock_bh(&idev->lock);
b2ed64a9 5413 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 5414 addrconf_verify_rtnl();
f53adae4
DB		 5415 return 0;
5416}
5417
11b1f828
DB		 5418static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5419 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5420 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5421};
5422
5423static int inet6_validate_link_af(const struct net_device *dev,
5424 const struct nlattr *nla)
5425{
5426 struct nlattr *tb[IFLA_INET6_MAX + 1];
5427
5428 if (dev && !__in6_dev_get(dev))
5429 return -EAFNOSUPPORT;
5430
fceb6435
JB		 5431 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5432 NULL);
11b1f828
DB		 5433}
5434
d35a00b8
FJ		 5435static int check_addr_gen_mode(int mode)
5436{
5437 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5438 mode != IN6_ADDR_GEN_MODE_NONE &&
5439 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5440 mode != IN6_ADDR_GEN_MODE_RANDOM)
5441 return -EINVAL;
5442 return 1;
5443}
5444
5445static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5446 int mode)
5447{
5448 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5449 !idev->cnf.stable_secret.initialized &&
5450 !net->ipv6.devconf_dflt->stable_secret.initialized)
5451 return -EINVAL;
5452 return 1;
5453}
5454
f53adae4
DB		 5455static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5456{
5457 int err = -EINVAL;
5458 struct inet6_dev *idev = __in6_dev_get(dev);
5459 struct nlattr *tb[IFLA_INET6_MAX + 1];
5460
5461 if (!idev)
5462 return -EAFNOSUPPORT;
5463
fceb6435 5464 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
f53adae4
DB		 5465 BUG();
5466
bc91b0f0 5467 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 5468 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 5469 if (err)
5470 return err;
5471 }
5472
5473 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5474 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5475
d35a00b8
FJ		 5476 if (check_addr_gen_mode(mode) < 0 ||
5477 check_stable_privacy(idev, dev_net(dev), mode) < 0)
bc91b0f0 5478 return -EINVAL;
622c81d5 5479
d35a00b8 5480 idev->cnf.addr_gen_mode = mode;
bc91b0f0
JP		 5481 err = 0;
5482 }
f53adae4
DB		 5483
5484 return err;
5485}
5486
1ab1457c 5487static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5488 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5489{
04561c1f 5490 struct net_device *dev = idev->dev;
04561c1f
TG		 5491 struct ifinfomsg *hdr;
5492 struct nlmsghdr *nlh;
5493 void *protoinfo;
04561c1f 5494
15e47304 5495 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5496 if (!nlh)
26932566 5497 return -EMSGSIZE;
04561c1f
TG		 5498
5499 hdr = nlmsg_data(nlh);
5500 hdr->ifi_family = AF_INET6;
5501 hdr->__ifi_pad = 0;
5502 hdr->ifi_type = dev->type;
5503 hdr->ifi_index = dev->ifindex;
5504 hdr->ifi_flags = dev_get_flags(dev);
5505 hdr->ifi_change = 0;
5506
c78679e8
DM		 5507 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5508 (dev->addr_len &&
5509 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5510 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5511 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5512 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5513 nla_put_u8(skb, IFLA_OPERSTATE,
5514 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5515 goto nla_put_failure;
04561c1f 5516 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 5517 if (!protoinfo)
04561c1f 5518 goto nla_put_failure;
1da177e4 5519
d5566fd7 5520 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5521 goto nla_put_failure;
1da177e4 5522
04561c1f 5523 nla_nest_end(skb, protoinfo);
053c095a
JB		 5524 nlmsg_end(skb, nlh);
5525 return 0;
1da177e4 5526
04561c1f 5527nla_put_failure:
26932566
PM		 5528 nlmsg_cancel(skb, nlh);
5529 return -EMSGSIZE;
1da177e4
LT		 5530}
5531
5532static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5533{
3b1e0a65 5534 struct net *net = sock_net(skb->sk);
84d2697d 5535 int h, s_h;
434a8a58 5536 int idx = 0, s_idx;
1da177e4
LT		 5537 struct net_device *dev;
5538 struct inet6_dev *idev;
84d2697d 5539 struct hlist_head *head;
1da177e4 5540
84d2697d
ED		 5541 s_h = cb->args[0];
5542 s_idx = cb->args[1];
5543
5544 rcu_read_lock();
5545 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5546 idx = 0;
5547 head = &net->dev_index_head[h];
b67bfe0d 5548 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5549 if (idx < s_idx)
5550 goto cont;
5551 idev = __in6_dev_get(dev);
5552 if (!idev)
5553 goto cont;
5554 if (inet6_fill_ifinfo(skb, idev,
15e47304 5555 NETLINK_CB(cb->skb).portid,
84d2697d 5556 cb->nlh->nlmsg_seq,
053c095a 5557 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5558 goto out;
7562f876 5559cont:
84d2697d
ED		 5560 idx++;
5561 }
1da177e4 5562 }
84d2697d
ED		 5563out:
5564 rcu_read_unlock();
5565 cb->args[1] = idx;
5566 cb->args[0] = h;
1da177e4
LT		 5567
5568 return skb->len;
5569}
5570
5571void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5572{
5573 struct sk_buff *skb;
c346dca1 5574 struct net *net = dev_net(idev->dev);
8d7a76c9 5575 int err = -ENOBUFS;
1ab1457c 5576
339bf98f 5577 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5578 if (!skb)
8d7a76c9
TG		 5579 goto errout;
5580
5581 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5582 if (err < 0) {
5583 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5584 WARN_ON(err == -EMSGSIZE);
5585 kfree_skb(skb);
5586 goto errout;
5587 }
5f75a104 5588 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5589 return;
8d7a76c9
TG		 5590errout:
5591 if (err < 0)
5f75a104 5592 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5593}
5594
339bf98f
TG		 5595static inline size_t inet6_prefix_nlmsg_size(void)
5596{
5597 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5598 + nla_total_size(sizeof(struct in6_addr))
5599 + nla_total_size(sizeof(struct prefix_cacheinfo));
5600}
c5396a31 5601
1da177e4 5602static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5603 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5604 int event, unsigned int flags)
1da177e4 5605{
6051e2f4
TG		 5606 struct prefixmsg *pmsg;
5607 struct nlmsghdr *nlh;
1da177e4
LT		 5608 struct prefix_cacheinfo ci;
5609
15e47304 5610 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5611 if (!nlh)
26932566 5612 return -EMSGSIZE;
6051e2f4
TG		 5613
5614 pmsg = nlmsg_data(nlh);
1da177e4 5615 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5616 pmsg->prefix_pad1 = 0;
5617 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5618 pmsg->prefix_ifindex = idev->dev->ifindex;
5619 pmsg->prefix_len = pinfo->prefix_len;
5620 pmsg->prefix_type = pinfo->type;
8a47077a 5621 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5622 pmsg->prefix_flags = 0;
5623 if (pinfo->onlink)
5624 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5625 if (pinfo->autoconf)
5626 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5627
c78679e8
DM		 5628 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5629 goto nla_put_failure;
1da177e4
LT		 5630 ci.preferred_time = ntohl(pinfo->prefered);
5631 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5632 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5633 goto nla_put_failure;
053c095a
JB		 5634 nlmsg_end(skb, nlh);
5635 return 0;
1da177e4 5636
6051e2f4 5637nla_put_failure:
26932566
PM		 5638 nlmsg_cancel(skb, nlh);
5639 return -EMSGSIZE;
1da177e4
LT		 5640}
5641
1ab1457c 5642static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5643 struct prefix_info *pinfo)
5644{
5645 struct sk_buff *skb;
c346dca1 5646 struct net *net = dev_net(idev->dev);
8c384bfa 5647 int err = -ENOBUFS;
1da177e4 5648
339bf98f 5649 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5650 if (!skb)
8c384bfa
TG		 5651 goto errout;
5652
5653 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5654 if (err < 0) {
5655 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5656 WARN_ON(err == -EMSGSIZE);
5657 kfree_skb(skb);
5658 goto errout;
5659 }
1ce85fe4
PNA		 5660 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5661 return;
8c384bfa
TG		 5662errout:
5663 if (err < 0)
6fda7350 5664 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5665}
5666
1da177e4
LT		 5667static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5668{
63998ac2
ND		 5669 struct net *net = dev_net(ifp->idev->dev);
5670
c15b1cca
HFS		 5671 if (event)
5672 ASSERT_RTNL();
5673
1da177e4
LT		 5674 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5675
5676 switch (event) {
5677 case RTM_NEWADDR:
95c385b4
NH		 5678 /*
5679 * If the address was optimistic
5680 * we inserted the route at the start of
5681 * our DAD process, so we don't need
5682 * to do it again
5683 */
93c2fb25 5684 if (!rcu_access_pointer(ifp->rt->fib6_node))
afb1d4b5 5685 ip6_ins_rt(net, ifp->rt);
1da177e4
LT		 5686 if (ifp->idev->cnf.forwarding)
5687 addrconf_join_anycast(ifp);
7996c799 5688 if (!ipv6_addr_any(&ifp->peer_addr))
8308f3ff 5689 addrconf_prefix_route(&ifp->peer_addr, 128, 0,
acb54e3c 5690 ifp->idev->dev, 0, 0,
27b10608 5691 GFP_ATOMIC);
1da177e4
LT		 5692 break;
5693 case RTM_DELADDR:
5694 if (ifp->idev->cnf.forwarding)
5695 addrconf_leave_anycast(ifp);
5696 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5697 if (!ipv6_addr_any(&ifp->peer_addr)) {
8d1c802b 5698 struct fib6_info *rt;
caeaba79 5699
e7478dfc
ND		 5700 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5701 ifp->idev->dev, 0, 0);
8e3d5be7 5702 if (rt)
afb1d4b5 5703 ip6_del_rt(net, rt);
caeaba79 5704 }
38bd10c4 5705 if (ifp->rt) {
93531c67
DA		 5706 ip6_del_rt(net, ifp->rt);
5707 ifp->rt = NULL;
38bd10c4 5708 }
705f1c86 5709 rt_genid_bump_ipv6(net);
1da177e4
LT		 5710 break;
5711 }
63998ac2 5712 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5713}
5714
5715static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5716{
8814c4b5 5717 rcu_read_lock_bh();
1da177e4
LT		 5718 if (likely(ifp->idev->dead == 0))
5719 __ipv6_ifa_notify(event, ifp);
8814c4b5 5720 rcu_read_unlock_bh();
1da177e4
LT		 5721}
5722
5723#ifdef CONFIG_SYSCTL
5724
5725static
fe2c6338 5726int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5727 void __user *buffer, size_t *lenp, loff_t *ppos)
5728{
5729 int *valp = ctl->data;
5730 int val = *valp;
88af182e 5731 loff_t pos = *ppos;
fe2c6338 5732 struct ctl_table lctl;
1da177e4
LT		 5733 int ret;
5734
013d97e9
FR		 5735 /*
5736 * ctl->data points to idev->cnf.forwarding, we should
5737 * not modify it until we get the rtnl lock.
5738 */
5739 lctl = *ctl;
5740 lctl.data = &val;
5741
5742 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5743
c8fecf22 5744 if (write)
b325fddb 5745 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5746 if (ret)
5747 *ppos = pos;
1ab1457c 5748 return ret;
1da177e4
LT		 5749}
5750
77751427
ML		 5751static
5752int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5753 void __user *buffer, size_t *lenp, loff_t *ppos)
5754{
5755 struct inet6_dev *idev = ctl->extra1;
5756 int min_mtu = IPV6_MIN_MTU;
5757 struct ctl_table lctl;
5758
5759 lctl = *ctl;
5760 lctl.extra1 = &min_mtu;
5761 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5762
5763 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5764}
5765
56d417b1
BH		 5766static void dev_disable_change(struct inet6_dev *idev)
5767{
75538c2b
CW		 5768 struct netdev_notifier_info info;
5769
56d417b1
BH		 5770 if (!idev || !idev->dev)
5771 return;
5772
75538c2b 5773 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5774 if (idev->cnf.disable_ipv6)
75538c2b 5775 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5776 else
75538c2b 5777 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5778}
5779
5780static void addrconf_disable_change(struct net *net, __s32 newf)
5781{
5782 struct net_device *dev;
5783 struct inet6_dev *idev;
5784
03e4deff 5785 for_each_netdev(net, dev) {
56d417b1
BH		 5786 idev = __in6_dev_get(dev);
5787 if (idev) {
5788 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5789 idev->cnf.disable_ipv6 = newf;
5790 if (changed)
5791 dev_disable_change(idev);
5792 }
56d417b1 5793 }
56d417b1
BH		 5794}
5795
013d97e9 5796static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5797{
5798 struct net *net;
013d97e9
FR		 5799 int old;
5800
5801 if (!rtnl_trylock())
5802 return restart_syscall();
56d417b1
BH		 5803
5804 net = (struct net *)table->extra2;
013d97e9
FR		 5805 old = *p;
5806 *p = newf;
56d417b1 5807
013d97e9
FR		 5808 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5809 rtnl_unlock();
56d417b1 5810 return 0;
88af182e 5811 }
56d417b1
BH		 5812
5813 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5814 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5815 addrconf_disable_change(net, newf);
013d97e9 5816 } else if ((!newf) ^ (!old))
56d417b1
BH		 5817 dev_disable_change((struct inet6_dev *)table->extra1);
5818
5819 rtnl_unlock();
5820 return 0;
5821}
5822
5823static
fe2c6338 5824int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5825 void __user *buffer, size_t *lenp, loff_t *ppos)
5826{
5827 int *valp = ctl->data;
5828 int val = *valp;
88af182e 5829 loff_t pos = *ppos;
fe2c6338 5830 struct ctl_table lctl;
56d417b1
BH		 5831 int ret;
5832
013d97e9
FR		 5833 /*
5834 * ctl->data points to idev->cnf.disable_ipv6, we should
5835 * not modify it until we get the rtnl lock.
5836 */
5837 lctl = *ctl;
5838 lctl.data = &val;
5839
5840 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5841
5842 if (write)
5843 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5844 if (ret)
5845 *ppos = pos;
56d417b1
BH		 5846 return ret;
5847}
5848
c92d5491 5849static
5850int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5851 void __user *buffer, size_t *lenp, loff_t *ppos)
5852{
5853 int *valp = ctl->data;
5854 int ret;
5855 int old, new;
5856
5857 old = *valp;
5858 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5859 new = *valp;
5860
5861 if (write && old != new) {
5862 struct net *net = ctl->extra2;
5863
5864 if (!rtnl_trylock())
5865 return restart_syscall();
5866
5867 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
85b3daad
DA		 5868 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5869 NETCONFA_PROXY_NEIGH,
c92d5491 5870 NETCONFA_IFINDEX_DEFAULT,
5871 net->ipv6.devconf_dflt);
5872 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
85b3daad
DA		 5873 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5874 NETCONFA_PROXY_NEIGH,
c92d5491 5875 NETCONFA_IFINDEX_ALL,
5876 net->ipv6.devconf_all);
5877 else {
5878 struct inet6_dev *idev = ctl->extra1;
5879
85b3daad
DA		 5880 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5881 NETCONFA_PROXY_NEIGH,
c92d5491 5882 idev->dev->ifindex,
5883 &idev->cnf);
5884 }
5885 rtnl_unlock();
5886 }
5887
5888 return ret;
5889}
5890
d35a00b8
FJ		 5891static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5892 void __user *buffer, size_t *lenp,
5893 loff_t *ppos)
5894{
5895 int ret = 0;
c6dbf7aa 5896 u32 new_val;
d35a00b8
FJ		 5897 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5898 struct net *net = (struct net *)ctl->extra2;
c6dbf7aa
SD		 5899 struct ctl_table tmp = {
5900 .data = &new_val,
5901 .maxlen = sizeof(new_val),
5902 .mode = ctl->mode,
5903 };
d35a00b8 5904
8c171d6c
FJ		 5905 if (!rtnl_trylock())
5906 return restart_syscall();
5907
c6dbf7aa 5908 new_val = *((u32 *)ctl->data);
d35a00b8 5909
c6dbf7aa
SD		 5910 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
5911 if (ret != 0)
5912 goto out;
d35a00b8 5913
c6dbf7aa 5914 if (write) {
8c171d6c
FJ		 5915 if (check_addr_gen_mode(new_val) < 0) {
5916 ret = -EINVAL;
5917 goto out;
5918 }
d35a00b8 5919
c6dbf7aa 5920 if (idev) {
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 5929 }
f24c5987
SD		 5930 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
5931 struct net_device *dev;
5932
5933 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
5934 for_each_netdev(net, dev) {
5935 idev = __in6_dev_get(dev);
5936 if (idev &&
5937 idev->cnf.addr_gen_mode != new_val) {
5938 idev->cnf.addr_gen_mode = new_val;
5939 addrconf_dev_config(idev->dev);
5940 }
5941 }
d35a00b8 5942 }
c6dbf7aa
SD		 5943
5944 *((u32 *)ctl->data) = new_val;
d35a00b8
FJ		 5945 }
5946
8c171d6c
FJ		 5947out:
5948 rtnl_unlock();
5949
d35a00b8
FJ		 5950 return ret;
5951}
5952
3d1bec99
HFS		 5953static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5954 void __user *buffer, size_t *lenp,
5955 loff_t *ppos)
5956{
5957 int err;
5958 struct in6_addr addr;
5959 char str[IPV6_MAX_STRLEN];
5960 struct ctl_table lctl = *ctl;
622c81d5 5961 struct net *net = ctl->extra2;
3d1bec99
HFS		 5962 struct ipv6_stable_secret *secret = ctl->data;
5963
622c81d5
HFS		 5964 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5965 return -EIO;
5966
3d1bec99
HFS		 5967 lctl.maxlen = IPV6_MAX_STRLEN;
5968 lctl.data = str;
5969
5970 if (!rtnl_trylock())
5971 return restart_syscall();
5972
5973 if (!write && !secret->initialized) {
5974 err = -EIO;
5975 goto out;
5976 }
5977
5449a5ca
WC		 5978 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5979 if (err >= sizeof(str)) {
5980 err = -EIO;
5981 goto out;
3d1bec99
HFS		 5982 }
5983
5984 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5985 if (err || !write)
5986 goto out;
5987
5988 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5989 err = -EIO;
5990 goto out;
5991 }
5992
5993 secret->initialized = true;
5994 secret->secret = addr;
5995
622c81d5
HFS		 5996 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5997 struct net_device *dev;
5998
5999 for_each_netdev(net, dev) {
6000 struct inet6_dev *idev = __in6_dev_get(dev);
6001
6002 if (idev) {
d35a00b8 6003 idev->cnf.addr_gen_mode =
622c81d5
HFS		 6004 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6005 }
6006 }
6007 } else {
6008 struct inet6_dev *idev = ctl->extra1;
6009
d35a00b8 6010 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
622c81d5
HFS		 6011 }
6012
3d1bec99
HFS		 6013out:
6014 rtnl_unlock();
6015
6016 return err;
6017}
c92d5491 6018
35103d11
AG		 6019static
6020int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6021 int write,
6022 void __user *buffer,
6023 size_t *lenp,
6024 loff_t *ppos)
6025{
6026 int *valp = ctl->data;
6027 int val = *valp;
6028 loff_t pos = *ppos;
6029 struct ctl_table lctl;
6030 int ret;
6031
6032 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6033 * we should not modify it until we get the rtnl lock.
6034 */
6035 lctl = *ctl;
6036 lctl.data = &val;
6037
6038 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6039
6040 if (write)
6041 ret = addrconf_fixup_linkdown(ctl, valp, val);
6042 if (ret)
6043 *ppos = pos;
6044 return ret;
6045}
6046
df789fe7
DF		 6047static
6048void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6049{
6050 if (rt) {
6051 if (action)
6052 rt->dst.flags |= DST_NOPOLICY;
6053 else
6054 rt->dst.flags &= ~DST_NOPOLICY;
6055 }
6056}
6057
6058static
6059void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6060{
6061 struct inet6_ifaddr *ifa;
6062
6063 read_lock_bh(&idev->lock);
6064 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6065 spin_lock(&ifa->lock);
6066 if (ifa->rt) {
8d1c802b 6067 struct fib6_info *rt = ifa->rt;
df789fe7
DF		 6068 int cpu;
6069
66f5d6ce 6070 rcu_read_lock();
3b6761d1 6071 ifa->rt->dst_nopolicy = val ? true : false;
df789fe7
DF		 6072 if (rt->rt6i_pcpu) {
6073 for_each_possible_cpu(cpu) {
6074 struct rt6_info **rtp;
6075
6076 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
6077 addrconf_set_nopolicy(*rtp, val);
6078 }
6079 }
66f5d6ce 6080 rcu_read_unlock();
df789fe7
DF		 6081 }
6082 spin_unlock(&ifa->lock);
6083 }
6084 read_unlock_bh(&idev->lock);
6085}
6086
6087static
6088int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6089{
6090 struct inet6_dev *idev;
6091 struct net *net;
6092
6093 if (!rtnl_trylock())
6094 return restart_syscall();
6095
6096 *valp = val;
6097
6098 net = (struct net *)ctl->extra2;
6099 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6100 rtnl_unlock();
6101 return 0;
6102 }
6103
6104 if (valp == &net->ipv6.devconf_all->disable_policy) {
6105 struct net_device *dev;
6106
6107 for_each_netdev(net, dev) {
6108 idev = __in6_dev_get(dev);
6109 if (idev)
6110 addrconf_disable_policy_idev(idev, val);
6111 }
6112 } else {
6113 idev = (struct inet6_dev *)ctl->extra1;
6114 addrconf_disable_policy_idev(idev, val);
6115 }
6116
6117 rtnl_unlock();
6118 return 0;
6119}
6120
6121static
6122int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6123 void __user *buffer, size_t *lenp,
6124 loff_t *ppos)
6125{
6126 int *valp = ctl->data;
6127 int val = *valp;
6128 loff_t pos = *ppos;
6129 struct ctl_table lctl;
6130 int ret;
6131
6132 lctl = *ctl;
6133 lctl.data = &val;
6134 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6135
6136 if (write && (*valp != val))
6137 ret = addrconf_disable_policy(ctl, valp, val);
6138
6139 if (ret)
6140 *ppos = pos;
6141
6142 return ret;
6143}
6144
cb4a4c69 6145static int minus_one = -1;
2210d6b2 6146static const int zero = 0;
cb9e684e
MŻ		 6147static const int one = 1;
6148static const int two_five_five = 255;
6149
607ea7cd 6150static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 6151 {
6152 .procname = "forwarding",
6153 .data = &ipv6_devconf.forwarding,
6154 .maxlen = sizeof(int),
6155 .mode = 0644,
6156 .proc_handler = addrconf_sysctl_forward,
6157 },
6158 {
6159 .procname = "hop_limit",
6160 .data = &ipv6_devconf.hop_limit,
6161 .maxlen = sizeof(int),
6162 .mode = 0644,
cb9e684e
MŻ		 6163 .proc_handler = proc_dointvec_minmax,
6164 .extra1 = (void *)&one,
6165 .extra2 = (void *)&two_five_five,
5df1f77f
KK		 6166 },
6167 {
6168 .procname = "mtu",
6169 .data = &ipv6_devconf.mtu6,
6170 .maxlen = sizeof(int),
6171 .mode = 0644,
6172 .proc_handler = addrconf_sysctl_mtu,
6173 },
6174 {
6175 .procname = "accept_ra",
6176 .data = &ipv6_devconf.accept_ra,
6177 .maxlen = sizeof(int),
6178 .mode = 0644,
6179 .proc_handler = proc_dointvec,
6180 },
6181 {
6182 .procname = "accept_redirects",
6183 .data = &ipv6_devconf.accept_redirects,
6184 .maxlen = sizeof(int),
6185 .mode = 0644,
6186 .proc_handler = proc_dointvec,
6187 },
6188 {
6189 .procname = "autoconf",
6190 .data = &ipv6_devconf.autoconf,
6191 .maxlen = sizeof(int),
6192 .mode = 0644,
6193 .proc_handler = proc_dointvec,
6194 },
6195 {
6196 .procname = "dad_transmits",
6197 .data = &ipv6_devconf.dad_transmits,
6198 .maxlen = sizeof(int),
6199 .mode = 0644,
6200 .proc_handler = proc_dointvec,
6201 },
6202 {
6203 .procname = "router_solicitations",
6204 .data = &ipv6_devconf.rtr_solicits,
6205 .maxlen = sizeof(int),
6206 .mode = 0644,
cb4a4c69
MŻ		 6207 .proc_handler = proc_dointvec_minmax,
6208 .extra1 = &minus_one,
5df1f77f
KK		 6209 },
6210 {
6211 .procname = "router_solicitation_interval",
6212 .data = &ipv6_devconf.rtr_solicit_interval,
6213 .maxlen = sizeof(int),
6214 .mode = 0644,
6215 .proc_handler = proc_dointvec_jiffies,
6216 },
bd11f074
MŻ		 6217 {
6218 .procname = "router_solicitation_max_interval",
6219 .data = &ipv6_devconf.rtr_solicit_max_interval,
6220 .maxlen = sizeof(int),
6221 .mode = 0644,
6222 .proc_handler = proc_dointvec_jiffies,
6223 },
5df1f77f
KK		 6224 {
6225 .procname = "router_solicitation_delay",
6226 .data = &ipv6_devconf.rtr_solicit_delay,
6227 .maxlen = sizeof(int),
6228 .mode = 0644,
6229 .proc_handler = proc_dointvec_jiffies,
6230 },
6231 {
6232 .procname = "force_mld_version",
6233 .data = &ipv6_devconf.force_mld_version,
6234 .maxlen = sizeof(int),
6235 .mode = 0644,
6236 .proc_handler = proc_dointvec,
6237 },
6238 {
6239 .procname = "mldv1_unsolicited_report_interval",
6240 .data =
6241 &ipv6_devconf.mldv1_unsolicited_report_interval,
6242 .maxlen = sizeof(int),
6243 .mode = 0644,
6244 .proc_handler = proc_dointvec_ms_jiffies,
6245 },
6246 {
6247 .procname = "mldv2_unsolicited_report_interval",
6248 .data =
6249 &ipv6_devconf.mldv2_unsolicited_report_interval,
6250 .maxlen = sizeof(int),
6251 .mode = 0644,
6252 .proc_handler = proc_dointvec_ms_jiffies,
6253 },
6254 {
6255 .procname = "use_tempaddr",
6256 .data = &ipv6_devconf.use_tempaddr,
6257 .maxlen = sizeof(int),
6258 .mode = 0644,
6259 .proc_handler = proc_dointvec,
6260 },
6261 {
6262 .procname = "temp_valid_lft",
6263 .data = &ipv6_devconf.temp_valid_lft,
6264 .maxlen = sizeof(int),
6265 .mode = 0644,
6266 .proc_handler = proc_dointvec,
6267 },
6268 {
6269 .procname = "temp_prefered_lft",
6270 .data = &ipv6_devconf.temp_prefered_lft,
6271 .maxlen = sizeof(int),
6272 .mode = 0644,
6273 .proc_handler = proc_dointvec,
6274 },
6275 {
6276 .procname = "regen_max_retry",
6277 .data = &ipv6_devconf.regen_max_retry,
6278 .maxlen = sizeof(int),
6279 .mode = 0644,
6280 .proc_handler = proc_dointvec,
6281 },
6282 {
6283 .procname = "max_desync_factor",
6284 .data = &ipv6_devconf.max_desync_factor,
6285 .maxlen = sizeof(int),
6286 .mode = 0644,
6287 .proc_handler = proc_dointvec,
6288 },
6289 {
6290 .procname = "max_addresses",
6291 .data = &ipv6_devconf.max_addresses,
6292 .maxlen = sizeof(int),
6293 .mode = 0644,
6294 .proc_handler = proc_dointvec,
6295 },
6296 {
6297 .procname = "accept_ra_defrtr",
6298 .data = &ipv6_devconf.accept_ra_defrtr,
6299 .maxlen = sizeof(int),
6300 .mode = 0644,
6301 .proc_handler = proc_dointvec,
6302 },
6303 {
6304 .procname = "accept_ra_min_hop_limit",
6305 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6306 .maxlen = sizeof(int),
6307 .mode = 0644,
6308 .proc_handler = proc_dointvec,
6309 },
6310 {
6311 .procname = "accept_ra_pinfo",
6312 .data = &ipv6_devconf.accept_ra_pinfo,
6313 .maxlen = sizeof(int),
6314 .mode = 0644,
6315 .proc_handler = proc_dointvec,
6316 },
930d6ff2 6317#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 6318 {
6319 .procname = "accept_ra_rtr_pref",
6320 .data = &ipv6_devconf.accept_ra_rtr_pref,
6321 .maxlen = sizeof(int),
6322 .mode = 0644,
6323 .proc_handler = proc_dointvec,
6324 },
6325 {
6326 .procname = "router_probe_interval",
6327 .data = &ipv6_devconf.rtr_probe_interval,
6328 .maxlen = sizeof(int),
6329 .mode = 0644,
6330 .proc_handler = proc_dointvec_jiffies,
6331 },
fa03ef38 6332#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b
JS		 6333 {
6334 .procname = "accept_ra_rt_info_min_plen",
6335 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6336 .maxlen = sizeof(int),
6337 .mode = 0644,
6338 .proc_handler = proc_dointvec,
6339 },
5df1f77f
KK		 6340 {
6341 .procname = "accept_ra_rt_info_max_plen",
6342 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6343 .maxlen = sizeof(int),
6344 .mode = 0644,
6345 .proc_handler = proc_dointvec,
6346 },
09c884d4 6347#endif
930d6ff2 6348#endif
5df1f77f
KK		 6349 {
6350 .procname = "proxy_ndp",
6351 .data = &ipv6_devconf.proxy_ndp,
6352 .maxlen = sizeof(int),
6353 .mode = 0644,
6354 .proc_handler = addrconf_sysctl_proxy_ndp,
6355 },
6356 {
6357 .procname = "accept_source_route",
6358 .data = &ipv6_devconf.accept_source_route,
6359 .maxlen = sizeof(int),
6360 .mode = 0644,
6361 .proc_handler = proc_dointvec,
6362 },
95c385b4 6363#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 6364 {
6365 .procname = "optimistic_dad",
6366 .data = &ipv6_devconf.optimistic_dad,
6367 .maxlen = sizeof(int),
6368 .mode = 0644,
6369 .proc_handler = proc_dointvec,
6370 },
6371 {
6372 .procname = "use_optimistic",
6373 .data = &ipv6_devconf.use_optimistic,
6374 .maxlen = sizeof(int),
6375 .mode = 0644,
6376 .proc_handler = proc_dointvec,
6377 },
7bc570c8
YH		 6378#endif
6379#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 6380 {
6381 .procname = "mc_forwarding",
6382 .data = &ipv6_devconf.mc_forwarding,
6383 .maxlen = sizeof(int),
6384 .mode = 0444,
6385 .proc_handler = proc_dointvec,
6386 },
95c385b4 6387#endif
5df1f77f
KK		 6388 {
6389 .procname = "disable_ipv6",
6390 .data = &ipv6_devconf.disable_ipv6,
6391 .maxlen = sizeof(int),
6392 .mode = 0644,
6393 .proc_handler = addrconf_sysctl_disable,
6394 },
6395 {
6396 .procname = "accept_dad",
6397 .data = &ipv6_devconf.accept_dad,
6398 .maxlen = sizeof(int),
6399 .mode = 0644,
6400 .proc_handler = proc_dointvec,
6401 },
6402 {
6403 .procname = "force_tllao",
6404 .data = &ipv6_devconf.force_tllao,
6405 .maxlen = sizeof(int),
6406 .mode = 0644,
6407 .proc_handler = proc_dointvec
6408 },
6409 {
6410 .procname = "ndisc_notify",
6411 .data = &ipv6_devconf.ndisc_notify,
6412 .maxlen = sizeof(int),
6413 .mode = 0644,
6414 .proc_handler = proc_dointvec
6415 },
6416 {
6417 .procname = "suppress_frag_ndisc",
6418 .data = &ipv6_devconf.suppress_frag_ndisc,
6419 .maxlen = sizeof(int),
6420 .mode = 0644,
6421 .proc_handler = proc_dointvec
6422 },
6423 {
6424 .procname = "accept_ra_from_local",
6425 .data = &ipv6_devconf.accept_ra_from_local,
6426 .maxlen = sizeof(int),
6427 .mode = 0644,
6428 .proc_handler = proc_dointvec,
6429 },
6430 {
6431 .procname = "accept_ra_mtu",
6432 .data = &ipv6_devconf.accept_ra_mtu,
6433 .maxlen = sizeof(int),
6434 .mode = 0644,
6435 .proc_handler = proc_dointvec,
6436 },
6437 {
6438 .procname = "stable_secret",
6439 .data = &ipv6_devconf.stable_secret,
6440 .maxlen = IPV6_MAX_STRLEN,
6441 .mode = 0600,
6442 .proc_handler = addrconf_sysctl_stable_secret,
6443 },
6444 {
6445 .procname = "use_oif_addrs_only",
6446 .data = &ipv6_devconf.use_oif_addrs_only,
6447 .maxlen = sizeof(int),
6448 .mode = 0644,
6449 .proc_handler = proc_dointvec,
6450 },
6451 {
6452 .procname = "ignore_routes_with_linkdown",
6453 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6454 .maxlen = sizeof(int),
6455 .mode = 0644,
6456 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6457 },
6458 {
6459 .procname = "drop_unicast_in_l2_multicast",
6460 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6461 .maxlen = sizeof(int),
6462 .mode = 0644,
6463 .proc_handler = proc_dointvec,
6464 },
6465 {
6466 .procname = "drop_unsolicited_na",
6467 .data = &ipv6_devconf.drop_unsolicited_na,
6468 .maxlen = sizeof(int),
6469 .mode = 0644,
6470 .proc_handler = proc_dointvec,
6471 },
6472 {
6473 .procname = "keep_addr_on_down",
6474 .data = &ipv6_devconf.keep_addr_on_down,
6475 .maxlen = sizeof(int),
6476 .mode = 0644,
6477 .proc_handler = proc_dointvec,
6478
6479 },
1ababeba
DL		 6480 {
6481 .procname = "seg6_enabled",
6482 .data = &ipv6_devconf.seg6_enabled,
6483 .maxlen = sizeof(int),
6484 .mode = 0644,
6485 .proc_handler = proc_dointvec,
6486 },
bf355b8d
DL		 6487#ifdef CONFIG_IPV6_SEG6_HMAC
6488 {
6489 .procname = "seg6_require_hmac",
6490 .data = &ipv6_devconf.seg6_require_hmac,
6491 .maxlen = sizeof(int),
6492 .mode = 0644,
6493 .proc_handler = proc_dointvec,
6494 },
6495#endif
adc176c5
EN		 6496 {
6497 .procname = "enhanced_dad",
6498 .data = &ipv6_devconf.enhanced_dad,
6499 .maxlen = sizeof(int),
6500 .mode = 0644,
6501 .proc_handler = proc_dointvec,
6502 },
d35a00b8
FJ		 6503 {
6504 .procname = "addr_gen_mode",
6505 .data = &ipv6_devconf.addr_gen_mode,
6506 .maxlen = sizeof(int),
6507 .mode = 0644,
6508 .proc_handler = addrconf_sysctl_addr_gen_mode,
6509 },
df789fe7
DF		 6510 {
6511 .procname = "disable_policy",
6512 .data = &ipv6_devconf.disable_policy,
6513 .maxlen = sizeof(int),
6514 .mode = 0644,
6515 .proc_handler = addrconf_sysctl_disable_policy,
6516 },
2210d6b2
MŻ		 6517 {
6518 .procname = "ndisc_tclass",
6519 .data = &ipv6_devconf.ndisc_tclass,
6520 .maxlen = sizeof(int),
6521 .mode = 0644,
6522 .proc_handler = proc_dointvec_minmax,
6523 .extra1 = (void *)&zero,
6524 .extra2 = (void *)&two_five_five,
6525 },
5df1f77f
KK		 6526 {
6527 /* sentinel */
6528 }
1da177e4
LT		 6529};
6530
bff16c2f 6531static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 6532 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4 6533{
29c994e3 6534 int i, ifindex;
607ea7cd 6535 struct ctl_table *table;
6105e293 6536 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 6537
607ea7cd
KK		 6538 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6539 if (!table)
f68635e6
PE		 6540 goto out;
6541
607ea7cd
KK		 6542 for (i = 0; table[i].data; i++) {
6543 table[i].data += (char *)p - (char *)&ipv6_devconf;
cb9e684e
MŻ		 6544 /* If one of these is already set, then it is not safe to
6545 * overwrite either of them: this makes proc_dointvec_minmax
6546 * usable.
6547 */
6548 if (!table[i].extra1 && !table[i].extra2) {
6549 table[i].extra1 = idev; /* embedded; no ref */
6550 table[i].extra2 = net;
6551 }
1da177e4 6552 }
1da177e4 6553
6105e293 6554 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 6555
607ea7cd
KK		 6556 p->sysctl_header = register_net_sysctl(net, path, table);
6557 if (!p->sysctl_header)
6105e293 6558 goto free;
f68635e6 6559
29c994e3
ND		 6560 if (!strcmp(dev_name, "all"))
6561 ifindex = NETCONFA_IFINDEX_ALL;
6562 else if (!strcmp(dev_name, "default"))
6563 ifindex = NETCONFA_IFINDEX_DEFAULT;
6564 else
6565 ifindex = idev->dev->ifindex;
85b3daad
DA		 6566 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6567 ifindex, p);
95897312 6568 return 0;
1da177e4 6569
f68635e6 6570free:
607ea7cd 6571 kfree(table);
f68635e6 6572out:
95897312 6573 return -ENOBUFS;
1da177e4
LT		 6574}
6575
23452170
DA		 6576static void __addrconf_sysctl_unregister(struct net *net,
6577 struct ipv6_devconf *p, int ifindex)
408c4768 6578{
607ea7cd 6579 struct ctl_table *table;
408c4768 6580
607ea7cd 6581 if (!p->sysctl_header)
408c4768
PE		 6582 return;
6583
607ea7cd
KK		 6584 table = p->sysctl_header->ctl_table_arg;
6585 unregister_net_sysctl_table(p->sysctl_header);
6586 p->sysctl_header = NULL;
6587 kfree(table);
23452170
DA		 6588
6589 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
408c4768
PE		 6590}
6591
a317a2f1 6592static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 6593{
a317a2f1
WC		 6594 int err;
6595
6596 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6597 return -EINVAL;
6598
6599 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6600 &ndisc_ifinfo_sysctl_change);
6601 if (err)
6602 return err;
6603 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6604 idev, &idev->cnf);
6605 if (err)
6606 neigh_sysctl_unregister(idev->nd_parms);
6607
6608 return err;
f52295a9
PE		 6609}
6610
408c4768 6611static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 6612{
23452170
DA		 6613 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6614 idev->dev->ifindex);
408c4768 6615 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 6616}
6617
6618
6619#endif
6620
2c8c1e72 6621static int __net_init addrconf_init_net(struct net *net)
e0da5a48 6622{
a79ca223 6623 int err = -ENOMEM;
e0da5a48
PE		 6624 struct ipv6_devconf *all, *dflt;
6625
a79ca223 6626 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 6627 if (!all)
a79ca223 6628 goto err_alloc_all;
e0da5a48 6629
a79ca223 6630 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 6631 if (!dflt)
a79ca223 6632 goto err_alloc_dflt;
e0da5a48 6633
a79ca223
HZ		 6634 /* these will be inherited by all namespaces */
6635 dflt->autoconf = ipv6_defaults.autoconf;
6636 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 6637
3d1bec99
HFS		 6638 dflt->stable_secret.initialized = false;
6639 all->stable_secret.initialized = false;
6640
e0da5a48
PE		 6641 net->ipv6.devconf_all = all;
6642 net->ipv6.devconf_dflt = dflt;
6643
6644#ifdef CONFIG_SYSCTL
f8572d8f 6645 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 6646 if (err < 0)
6647 goto err_reg_all;
6648
f8572d8f 6649 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 6650 if (err < 0)
6651 goto err_reg_dflt;
6652#endif
6653 return 0;
6654
6655#ifdef CONFIG_SYSCTL
6656err_reg_dflt:
23452170 6657 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
e0da5a48
PE		 6658err_reg_all:
6659 kfree(dflt);
6660#endif
6661err_alloc_dflt:
6662 kfree(all);
6663err_alloc_all:
6664 return err;
6665}
6666
2c8c1e72 6667static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 6668{
6669#ifdef CONFIG_SYSCTL
23452170
DA		 6670 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6671 NETCONFA_IFINDEX_DEFAULT);
6672 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6673 NETCONFA_IFINDEX_ALL);
e0da5a48 6674#endif
73cf0e92 6675 kfree(net->ipv6.devconf_dflt);
6676 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 6677}
6678
6679static struct pernet_operations addrconf_ops = {
6680 .init = addrconf_init_net,
6681 .exit = addrconf_exit_net,
6682};
6683
207895fd 6684static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 6685 .family = AF_INET6,
6686 .fill_link_af = inet6_fill_link_af,
6687 .get_link_af_size = inet6_get_link_af_size,
11b1f828 6688 .validate_link_af = inet6_validate_link_af,
f53adae4 6689 .set_link_af = inet6_set_link_af,
b382b191
TG		 6690};
6691
1da177e4
LT		 6692/*
6693 * Init / cleanup code
6694 */
6695
6696int __init addrconf_init(void)
6697{
a317a2f1 6698 struct inet6_dev *idev;
c2e21293 6699 int i, err;
2a8cc6c8 6700
e21e8467
SH		 6701 err = ipv6_addr_label_init();
6702 if (err < 0) {
f3213831
JP		 6703 pr_crit("%s: cannot initialize default policy table: %d\n",
6704 __func__, err);
2cc6d2bf 6705 goto out;
2a8cc6c8 6706 }
1da177e4 6707
2cc6d2bf
NH		 6708 err = register_pernet_subsys(&addrconf_ops);
6709 if (err < 0)
6710 goto out_addrlabel;
e0da5a48 6711
c15b1cca
HFS		 6712 addrconf_wq = create_workqueue("ipv6_addrconf");
6713 if (!addrconf_wq) {
6714 err = -ENOMEM;
6715 goto out_nowq;
6716 }
6717
1da177e4
LT		 6718 /* The addrconf netdev notifier requires that loopback_dev
6719 * has it's ipv6 private information allocated and setup
6720 * before it can bring up and give link-local addresses
6721 * to other devices which are up.
6722 *
6723 * Unfortunately, loopback_dev is not necessarily the first
6724 * entry in the global dev_base list of net devices. In fact,
6725 * it is likely to be the very last entry on that list.
6726 * So this causes the notifier registry below to try and
6727 * give link-local addresses to all devices besides loopback_dev
6728 * first, then loopback_dev, which cases all the non-loopback_dev
6729 * devices to fail to get a link-local address.
6730 *
6731 * So, as a temporary fix, allocate the ipv6 structure for
6732 * loopback_dev first by hand.
6733 * Longer term, all of the dependencies ipv6 has upon the loopback
6734 * device and it being up should be removed.
6735 */
6736 rtnl_lock();
a317a2f1 6737 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 6738 rtnl_unlock();
a317a2f1
WC		 6739 if (IS_ERR(idev)) {
6740 err = PTR_ERR(idev);
e0da5a48 6741 goto errlo;
a317a2f1 6742 }
1da177e4 6743
2f460933
WC		 6744 ip6_route_init_special_entries();
6745
c2e21293 6746 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6747 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6748
1da177e4
LT		 6749 register_netdevice_notifier(&ipv6_dev_notf);
6750
c15b1cca 6751 addrconf_verify();
c127ea2c 6752
3678a9d8 6753 rtnl_af_register(&inet6_ops);
b382b191 6754
16feebcf
FW		 6755 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
6756 NULL, inet6_dump_ifinfo, 0);
c127ea2c
TG		 6757 if (err < 0)
6758 goto errout;
6759
16feebcf
FW		 6760 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
6761 inet6_rtm_newaddr, NULL, 0);
6762 if (err < 0)
6763 goto errout;
6764 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
6765 inet6_rtm_deladdr, NULL, 0);
6766 if (err < 0)
6767 goto errout;
6768 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
6769 inet6_rtm_getaddr, inet6_dump_ifaddr,
6770 RTNL_FLAG_DOIT_UNLOCKED);
6771 if (err < 0)
6772 goto errout;
6773 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
6774 NULL, inet6_dump_ifmcaddr, 0);
6775 if (err < 0)
6776 goto errout;
6777 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
6778 NULL, inet6_dump_ifacaddr, 0);
6779 if (err < 0)
6780 goto errout;
6781 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
6782 inet6_netconf_get_devconf,
6783 inet6_netconf_dump_devconf,
6784 RTNL_FLAG_DOIT_UNLOCKED);
6785 if (err < 0)
6786 goto errout;
a3fde2ad
FW		 6787 err = ipv6_addr_label_rtnl_register();
6788 if (err < 0)
6789 goto errout;
2a8cc6c8 6790
1da177e4 6791 return 0;
c127ea2c 6792errout:
16feebcf 6793 rtnl_unregister_all(PF_INET6);
b382b191 6794 rtnl_af_unregister(&inet6_ops);
c127ea2c 6795 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6796errlo:
c15b1cca
HFS		 6797 destroy_workqueue(addrconf_wq);
6798out_nowq:
e0da5a48 6799 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 6800out_addrlabel:
6801 ipv6_addr_label_cleanup();
6802out:
c127ea2c 6803 return err;
1da177e4
LT		 6804}
6805
09f7709f 6806void addrconf_cleanup(void)
1da177e4 6807{
176c39af 6808 struct net_device *dev;
1da177e4
LT		 6809 int i;
6810
6811 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6812 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 6813 ipv6_addr_label_cleanup();
1da177e4 6814
5c45121d 6815 rtnl_af_unregister(&inet6_ops);
1da177e4 6816
5c45121d 6817 rtnl_lock();
b382b191 6818
176c39af
DL		 6819 /* clean dev list */
6820 for_each_netdev(&init_net, dev) {
6821 if (__in6_dev_get(dev) == NULL)
6822 continue;
6823 addrconf_ifdown(dev, 1);
6824 }
6825 addrconf_ifdown(init_net.loopback_dev, 2);
6826
1da177e4
LT		 6827 /*
6828 * Check hash table.
6829 */
5c578aed 6830 spin_lock_bh(&addrconf_hash_lock);
c2e21293 6831 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6832 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 6833 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 6834 cancel_delayed_work(&addr_chk_work);
1da177e4 6835 rtnl_unlock();
c15b1cca
HFS		 6836
6837 destroy_workqueue(addrconf_wq);
1da177e4 6838}
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