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Merge tag 'devicetree-fixes-for-4.20-1' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6-block.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
174cd4b1 46#include <linux/sched/signal.h>
1da177e4
LT		 47#include <linux/socket.h>
48#include <linux/sockios.h>
1da177e4 49#include <linux/net.h>
3d1bec99 50#include <linux/inet.h>
1da177e4
LT		 51#include <linux/in6.h>
52#include <linux/netdevice.h>
1823730f 53#include <linux/if_addr.h>
1da177e4
LT		 54#include <linux/if_arp.h>
55#include <linux/if_arcnet.h>
56#include <linux/if_infiniband.h>
57#include <linux/route.h>
58#include <linux/inetdevice.h>
59#include <linux/init.h>
5a0e3ad6 60#include <linux/slab.h>
1da177e4
LT		 61#ifdef CONFIG_SYSCTL
62#include <linux/sysctl.h>
63#endif
4fc268d2 64#include <linux/capability.h>
1da177e4
LT		 65#include <linux/delay.h>
66#include <linux/notifier.h>
543537bd 67#include <linux/string.h>
ddbe5032 68#include <linux/hash.h>
1da177e4 69
457c4cbc 70#include <net/net_namespace.h>
1da177e4
LT		 71#include <net/sock.h>
72#include <net/snmp.h>
73
5241c2d7 74#include <net/6lowpan.h>
cb6bf355 75#include <net/firewire.h>
1da177e4
LT		 76#include <net/ipv6.h>
77#include <net/protocol.h>
78#include <net/ndisc.h>
79#include <net/ip6_route.h>
80#include <net/addrconf.h>
81#include <net/tcp.h>
82#include <net/ip.h>
5d620266 83#include <net/netlink.h>
f24e3d65 84#include <net/pkt_sched.h>
ca254490 85#include <net/l3mdev.h>
1da177e4
LT		 86#include <linux/if_tunnel.h>
87#include <linux/rtnetlink.h>
f3a1bfb1 88#include <linux/netconf.h>
1da177e4 89#include <linux/random.h>
e21e8467 90#include <linux/uaccess.h>
7f7d9a6b 91#include <asm/unaligned.h>
1da177e4
LT		 92
93#include <linux/proc_fs.h>
94#include <linux/seq_file.h>
bc3b2d7f 95#include <linux/export.h>
1da177e4 96
1da177e4 97#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e 98
3d1bec99
HFS		 99#define IPV6_MAX_STRLEN \
100 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
101
18a31e1e
TG		 102static inline u32 cstamp_delta(unsigned long cstamp)
103{
104 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
105}
1da177e4 106
bd11f074
MŻ		 107static inline s32 rfc3315_s14_backoff_init(s32 irt)
108{
109 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
110 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
111 do_div(tmp, 1000000);
112 return (s32)tmp;
113}
114
115static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
116{
117 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
118 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
119 do_div(tmp, 1000000);
120 if ((s32)tmp > mrt) {
121 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
122 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
123 do_div(tmp, 1000000);
124 }
125 return (s32)tmp;
126}
127
1da177e4 128#ifdef CONFIG_SYSCTL
a317a2f1 129static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 130static void addrconf_sysctl_unregister(struct inet6_dev *idev);
131#else
a317a2f1 132static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 133{
a317a2f1 134 return 0;
408c4768
PE		 135}
136
137static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
138{
139}
1da177e4
LT		 140#endif
141
9d6280da
JB		 142static void ipv6_regen_rndid(struct inet6_dev *idev);
143static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 144
1b34be74 145static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
d9bf82c2 146static int ipv6_count_addresses(const struct inet6_dev *idev);
622c81d5
HFS		 147static int ipv6_generate_stable_address(struct in6_addr *addr,
148 u8 dad_count,
149 const struct inet6_dev *idev);
1da177e4 150
27c565ae
ED		 151#define IN6_ADDR_HSIZE_SHIFT 8
152#define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
1da177e4
LT		 153/*
154 * Configured unicast address hash table
155 */
c2e21293 156static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 157static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 158
c15b1cca
HFS		 159static void addrconf_verify(void);
160static void addrconf_verify_rtnl(void);
161static void addrconf_verify_work(struct work_struct *);
1da177e4 162
c15b1cca
HFS		 163static struct workqueue_struct *addrconf_wq;
164static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 165
166static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
167static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
168
93d9b7d7
JP		 169static void addrconf_type_change(struct net_device *dev,
170 unsigned long event);
1da177e4
LT		 171static int addrconf_ifdown(struct net_device *dev, int how);
172
8d1c802b 173static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
21caa662
RK		 174 int plen,
175 const struct net_device *dev,
176 u32 flags, u32 noflags);
177
cf22f9a2 178static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 179static void addrconf_dad_work(struct work_struct *w);
c76fe2d9
DA		 180static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
181 bool send_na);
c5e33bdd 182static void addrconf_dad_run(struct inet6_dev *idev);
e99e88a9 183static void addrconf_rs_timer(struct timer_list *t);
1da177e4
LT		 184static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
185static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
186
1ab1457c 187static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 188 struct prefix_info *pinfo);
1da177e4 189
888c848e 190static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 191 .forwarding = 0,
192 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
193 .mtu6 = IPV6_MIN_MTU,
194 .accept_ra = 1,
195 .accept_redirects = 1,
196 .autoconf = 1,
197 .force_mld_version = 0,
fc4eba58
HFS		 198 .mldv1_unsolicited_report_interval = 10 * HZ,
199 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 200 .dad_transmits = 1,
201 .rtr_solicits = MAX_RTR_SOLICITATIONS,
202 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 203 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 204 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 205 .use_tempaddr = 0,
1da177e4
LT		 206 .temp_valid_lft = TEMP_VALID_LIFETIME,
207 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
208 .regen_max_retry = REGEN_MAX_RETRY,
209 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 210 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 211 .accept_ra_defrtr = 1,
d9333196 212 .accept_ra_from_local = 0,
8013d1d7 213 .accept_ra_min_hop_limit= 1,
c4fd30eb 214 .accept_ra_pinfo = 1,
930d6ff2
YH		 215#ifdef CONFIG_IPV6_ROUTER_PREF
216 .accept_ra_rtr_pref = 1,
52e16356 217 .rtr_probe_interval = 60 * HZ,
09c884d4 218#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 219 .accept_ra_rt_info_min_plen = 0,
09c884d4
YH		 220 .accept_ra_rt_info_max_plen = 0,
221#endif
930d6ff2 222#endif
fbea49e1 223 .proxy_ndp = 0,
0bcbc926 224 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 225 .disable_ipv6 = 0,
09400953 226 .accept_dad = 0,
b800c3b9 227 .suppress_frag_ndisc = 1,
c2943f14 228 .accept_ra_mtu = 1,
3d1bec99
HFS		 229 .stable_secret = {
230 .initialized = false,
3985e8a3
EK		 231 },
232 .use_oif_addrs_only = 0,
35103d11 233 .ignore_routes_with_linkdown = 0,
f1705ec1 234 .keep_addr_on_down = 0,
1ababeba 235 .seg6_enabled = 0,
bf355b8d
DL		 236#ifdef CONFIG_IPV6_SEG6_HMAC
237 .seg6_require_hmac = 0,
238#endif
adc176c5 239 .enhanced_dad = 1,
d35a00b8 240 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
df789fe7 241 .disable_policy = 0,
1da177e4
LT		 242};
243
ab32ea5d 244static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 245 .forwarding = 0,
246 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
247 .mtu6 = IPV6_MIN_MTU,
248 .accept_ra = 1,
249 .accept_redirects = 1,
250 .autoconf = 1,
fc4eba58
HFS		 251 .force_mld_version = 0,
252 .mldv1_unsolicited_report_interval = 10 * HZ,
253 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 254 .dad_transmits = 1,
255 .rtr_solicits = MAX_RTR_SOLICITATIONS,
256 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 257 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 258 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 259 .use_tempaddr = 0,
260 .temp_valid_lft = TEMP_VALID_LIFETIME,
261 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
262 .regen_max_retry = REGEN_MAX_RETRY,
263 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 264 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 265 .accept_ra_defrtr = 1,
d9333196 266 .accept_ra_from_local = 0,
8013d1d7 267 .accept_ra_min_hop_limit= 1,
c4fd30eb 268 .accept_ra_pinfo = 1,
930d6ff2
YH		 269#ifdef CONFIG_IPV6_ROUTER_PREF
270 .accept_ra_rtr_pref = 1,
52e16356 271 .rtr_probe_interval = 60 * HZ,
09c884d4 272#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 273 .accept_ra_rt_info_min_plen = 0,
09c884d4
YH		 274 .accept_ra_rt_info_max_plen = 0,
275#endif
930d6ff2 276#endif
fbea49e1 277 .proxy_ndp = 0,
0bcbc926 278 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 279 .disable_ipv6 = 0,
1b34be74 280 .accept_dad = 1,
b800c3b9 281 .suppress_frag_ndisc = 1,
c2943f14 282 .accept_ra_mtu = 1,
3d1bec99
HFS		 283 .stable_secret = {
284 .initialized = false,
285 },
3985e8a3 286 .use_oif_addrs_only = 0,
35103d11 287 .ignore_routes_with_linkdown = 0,
f1705ec1 288 .keep_addr_on_down = 0,
1ababeba 289 .seg6_enabled = 0,
bf355b8d
DL		 290#ifdef CONFIG_IPV6_SEG6_HMAC
291 .seg6_require_hmac = 0,
292#endif
adc176c5 293 .enhanced_dad = 1,
d35a00b8 294 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
df789fe7 295 .disable_policy = 0,
1da177e4
LT		 296};
297
1f372c7b
MM		 298/* Check if link is ready: is it up and is a valid qdisc available */
299static inline bool addrconf_link_ready(const struct net_device *dev)
f24e3d65 300{
1f372c7b 301 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
f24e3d65
MC		 302}
303
b7b1bfce 304static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 305{
b7b1bfce
HFS		 306 if (del_timer(&idev->rs_timer))
307 __in6_dev_put(idev);
308}
309
c15b1cca 310static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 311{
c15b1cca 312 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 313 __in6_ifa_put(ifp);
314}
315
b7b1bfce
HFS		 316static void addrconf_mod_rs_timer(struct inet6_dev *idev,
317 unsigned long when)
318{
319 if (!timer_pending(&idev->rs_timer))
320 in6_dev_hold(idev);
321 mod_timer(&idev->rs_timer, jiffies + when);
322}
1da177e4 323
c15b1cca
HFS		 324static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
325 unsigned long delay)
1da177e4 326{
f8a894b2
XL		 327 in6_ifa_hold(ifp);
328 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
329 in6_ifa_put(ifp);
1da177e4
LT		 330}
331
7f7d9a6b
HX		 332static int snmp6_alloc_dev(struct inet6_dev *idev)
333{
827da44c
JS		 334 int i;
335
698365fa
WC		 336 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
337 if (!idev->stats.ipv6)
7f7d9a6b 338 goto err_ip;
827da44c
JS		 339
340 for_each_possible_cpu(i) {
341 struct ipstats_mib *addrconf_stats;
698365fa 342 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 343 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 344 }
345
346
be281e55
ED		 347 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
348 GFP_KERNEL);
349 if (!idev->stats.icmpv6dev)
7f7d9a6b 350 goto err_icmp;
be281e55
ED		 351 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
352 GFP_KERNEL);
353 if (!idev->stats.icmpv6msgdev)
14878f75 354 goto err_icmpmsg;
7f7d9a6b
HX		 355
356 return 0;
357
14878f75 358err_icmpmsg:
be281e55 359 kfree(idev->stats.icmpv6dev);
7f7d9a6b 360err_icmp:
698365fa 361 free_percpu(idev->stats.ipv6);
7f7d9a6b 362err_ip:
aaf70ec7 363 return -ENOMEM;
7f7d9a6b
HX		 364}
365
8e5e8f30 366static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 367{
368 struct inet6_dev *ndev;
a317a2f1 369 int err = -ENOMEM;
1da177e4
LT		 370
371 ASSERT_RTNL();
372
373 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 374 return ERR_PTR(-EINVAL);
1da177e4 375
1ab1457c 376 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
63159f29 377 if (!ndev)
a317a2f1 378 return ERR_PTR(err);
322f74a4
IO		 379
380 rwlock_init(&ndev->lock);
381 ndev->dev = dev;
502a2ffd 382 INIT_LIST_HEAD(&ndev->addr_list);
e99e88a9 383 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
c346dca1 384 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
9b29c696
HFS		 385
386 if (ndev->cnf.stable_secret.initialized)
d35a00b8 387 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
9b29c696 388
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{
addd383f 669 const struct nlmsghdr *nlh = cb->nlh;
7a674200
ND		 670 struct net *net = sock_net(skb->sk);
671 int h, s_h;
672 int idx, s_idx;
673 struct net_device *dev;
674 struct inet6_dev *idev;
675 struct hlist_head *head;
676
addd383f
DA		 677 if (cb->strict_check) {
678 struct netlink_ext_ack *extack = cb->extack;
679 struct netconfmsg *ncm;
680
681 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
682 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
683 return -EINVAL;
684 }
685
686 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
687 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
688 return -EINVAL;
689 }
690 }
691
7a674200
ND		 692 s_h = cb->args[0];
693 s_idx = idx = cb->args[1];
694
695 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
696 idx = 0;
697 head = &net->dev_index_head[h];
698 rcu_read_lock();
63998ac2
ND		 699 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
700 net->dev_base_seq;
7a674200
ND		 701 hlist_for_each_entry_rcu(dev, head, index_hlist) {
702 if (idx < s_idx)
703 goto cont;
704 idev = __in6_dev_get(dev);
705 if (!idev)
706 goto cont;
707
708 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
709 &idev->cnf,
710 NETLINK_CB(cb->skb).portid,
addd383f 711 nlh->nlmsg_seq,
7a674200
ND		 712 RTM_NEWNETCONF,
713 NLM_F_MULTI,
136ba622 714 NETCONFA_ALL) < 0) {
7a674200
ND		 715 rcu_read_unlock();
716 goto done;
717 }
63998ac2 718 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 719cont:
720 idx++;
721 }
722 rcu_read_unlock();
723 }
724 if (h == NETDEV_HASHENTRIES) {
725 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
726 net->ipv6.devconf_all,
727 NETLINK_CB(cb->skb).portid,
addd383f 728 nlh->nlmsg_seq,
7a674200 729 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 730 NETCONFA_ALL) < 0)
7a674200
ND		 731 goto done;
732 else
733 h++;
734 }
735 if (h == NETDEV_HASHENTRIES + 1) {
736 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
737 net->ipv6.devconf_dflt,
738 NETLINK_CB(cb->skb).portid,
addd383f 739 nlh->nlmsg_seq,
7a674200 740 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 741 NETCONFA_ALL) < 0)
7a674200
ND		 742 goto done;
743 else
744 h++;
745 }
746done:
747 cb->args[0] = h;
748 cb->args[1] = idx;
749
750 return skb->len;
751}
752
1da177e4
LT		 753#ifdef CONFIG_SYSCTL
754static void dev_forward_change(struct inet6_dev *idev)
755{
756 struct net_device *dev;
757 struct inet6_ifaddr *ifa;
1da177e4
LT		 758
759 if (!idev)
760 return;
761 dev = idev->dev;
0187bdfb
BH		 762 if (idev->cnf.forwarding)
763 dev_disable_lro(dev);
1a940835 764 if (dev->flags & IFF_MULTICAST) {
2c5e8933 765 if (idev->cnf.forwarding) {
f3ee4010 766 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 767 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
768 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
769 } else {
f3ee4010 770 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 771 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
772 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
773 }
1da177e4 774 }
502a2ffd 775
776 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 777 if (ifa->flags&IFA_F_TENTATIVE)
778 continue;
1da177e4
LT		 779 if (idev->cnf.forwarding)
780 addrconf_join_anycast(ifa);
781 else
782 addrconf_leave_anycast(ifa);
783 }
85b3daad
DA		 784 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
785 NETCONFA_FORWARDING,
f3a1bfb1 786 dev->ifindex, &idev->cnf);
1da177e4
LT		 787}
788
789
e186932b 790static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 791{
792 struct net_device *dev;
793 struct inet6_dev *idev;
794
4acd4945 795 for_each_netdev(net, dev) {
1da177e4
LT		 796 idev = __in6_dev_get(dev);
797 if (idev) {
e186932b
PE		 798 int changed = (!idev->cnf.forwarding) ^ (!newf);
799 idev->cnf.forwarding = newf;
1da177e4
LT		 800 if (changed)
801 dev_forward_change(idev);
802 }
1da177e4 803 }
1da177e4 804}
c8fecf22 805
013d97e9 806static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 807{
bff16c2f 808 struct net *net;
013d97e9
FR		 809 int old;
810
811 if (!rtnl_trylock())
812 return restart_syscall();
bff16c2f
PE		 813
814 net = (struct net *)table->extra2;
013d97e9
FR		 815 old = *p;
816 *p = newf;
b325fddb 817
013d97e9 818 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1 819 if ((!newf) ^ (!old))
85b3daad
DA		 820 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
821 NETCONFA_FORWARDING,
f3a1bfb1
ND		 822 NETCONFA_IFINDEX_DEFAULT,
823 net->ipv6.devconf_dflt);
013d97e9
FR		 824 rtnl_unlock();
825 return 0;
88af182e 826 }
c8fecf22 827
e186932b 828 if (p == &net->ipv6.devconf_all->forwarding) {
d26c638c
ND		 829 int old_dflt = net->ipv6.devconf_dflt->forwarding;
830
e186932b 831 net->ipv6.devconf_dflt->forwarding = newf;
d26c638c 832 if ((!newf) ^ (!old_dflt))
85b3daad
DA		 833 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
834 NETCONFA_FORWARDING,
d26c638c
ND		 835 NETCONFA_IFINDEX_DEFAULT,
836 net->ipv6.devconf_dflt);
837
e186932b 838 addrconf_forward_change(net, newf);
f3a1bfb1 839 if ((!newf) ^ (!old))
85b3daad
DA		 840 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
841 NETCONFA_FORWARDING,
f3a1bfb1
ND		 842 NETCONFA_IFINDEX_ALL,
843 net->ipv6.devconf_all);
013d97e9 844 } else if ((!newf) ^ (!old))
c8fecf22 845 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 846 rtnl_unlock();
c8fecf22 847
013d97e9 848 if (newf)
7b4da532 849 rt6_purge_dflt_routers(net);
b325fddb 850 return 1;
c8fecf22 851}
35103d11
AG		 852
853static void addrconf_linkdown_change(struct net *net, __s32 newf)
854{
855 struct net_device *dev;
856 struct inet6_dev *idev;
857
858 for_each_netdev(net, dev) {
859 idev = __in6_dev_get(dev);
860 if (idev) {
861 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
862
863 idev->cnf.ignore_routes_with_linkdown = newf;
864 if (changed)
865 inet6_netconf_notify_devconf(dev_net(dev),
85b3daad 866 RTM_NEWNETCONF,
35103d11
AG		 867 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
868 dev->ifindex,
869 &idev->cnf);
870 }
871 }
872}
873
874static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
875{
876 struct net *net;
877 int old;
878
879 if (!rtnl_trylock())
880 return restart_syscall();
881
882 net = (struct net *)table->extra2;
883 old = *p;
884 *p = newf;
885
886 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
887 if ((!newf) ^ (!old))
888 inet6_netconf_notify_devconf(net,
85b3daad 889 RTM_NEWNETCONF,
35103d11
AG		 890 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
891 NETCONFA_IFINDEX_DEFAULT,
892 net->ipv6.devconf_dflt);
893 rtnl_unlock();
894 return 0;
895 }
896
897 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
898 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
899 addrconf_linkdown_change(net, newf);
900 if ((!newf) ^ (!old))
901 inet6_netconf_notify_devconf(net,
85b3daad 902 RTM_NEWNETCONF,
35103d11
AG		 903 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
904 NETCONFA_IFINDEX_ALL,
905 net->ipv6.devconf_all);
906 }
907 rtnl_unlock();
908
909 return 1;
910}
911
1da177e4
LT		 912#endif
913
5c578aed 914/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 915void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
916{
c2e21293 917 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 918
1da177e4 919#ifdef NET_REFCNT_DEBUG
91df42be 920 pr_debug("%s\n", __func__);
1da177e4
LT		 921#endif
922
923 in6_dev_put(ifp->idev);
924
c15b1cca
HFS		 925 if (cancel_delayed_work(&ifp->dad_work))
926 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
927 ifp);
1da177e4 928
e9d3e084 929 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 930 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 931 return;
932 }
1da177e4 933
e5785985 934 kfree_rcu(ifp, rcu);
1da177e4
LT		 935}
936
e55ffac6
BH		 937static void
938ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
939{
502a2ffd 940 struct list_head *p;
8a6ce0c0 941 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 942
943 /*
944 * Each device address list is sorted in order of scope -
945 * global before linklocal.
946 */
502a2ffd 947 list_for_each(p, &idev->addr_list) {
948 struct inet6_ifaddr *ifa
949 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 950 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 951 break;
952 }
953
8ef802aa 954 list_add_tail_rcu(&ifp->if_list, p);
e55ffac6
BH		 955}
956
3f27fb23 957static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
3eb84f49 958{
3f27fb23
ED		 959 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
960
961 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 962}
963
56fc709b 964static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
752a9292 965 struct net_device *dev, unsigned int hash)
56fc709b 966{
56fc709b
ED		 967 struct inet6_ifaddr *ifp;
968
969 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
970 if (!net_eq(dev_net(ifp->idev->dev), net))
971 continue;
972 if (ipv6_addr_equal(&ifp->addr, addr)) {
973 if (!dev || ifp->idev->dev == dev)
974 return true;
975 }
976 }
977 return false;
978}
979
f3d9832e
DA		 980static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
981{
3f27fb23 982 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
f3d9832e
DA		 983 int err = 0;
984
985 spin_lock(&addrconf_hash_lock);
986
987 /* Ignore adding duplicate addresses on an interface */
752a9292 988 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
e32ac250 989 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
f3d9832e 990 err = -EEXIST;
752a9292
ED		 991 } else {
992 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
f3d9832e
DA		 993 }
994
f3d9832e
DA		 995 spin_unlock(&addrconf_hash_lock);
996
997 return err;
998}
999
1da177e4
LT		 1000/* On success it returns ifp with increased reference count */
1001
1002static struct inet6_ifaddr *
e6464b8c 1003ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
de95e047 1004 bool can_block, struct netlink_ext_ack *extack)
1da177e4 1005{
f3d9832e 1006 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
e6464b8c 1007 int addr_type = ipv6_addr_type(cfg->pfx);
df789fe7 1008 struct net *net = dev_net(idev->dev);
1da177e4 1009 struct inet6_ifaddr *ifa = NULL;
360a9887 1010 struct fib6_info *f6i = NULL;
1da177e4 1011 int err = 0;
d68b8270
YH		 1012
1013 if (addr_type == IPV6_ADDR_ANY ||
1014 addr_type & IPV6_ADDR_MULTICAST ||
1015 (!(idev->dev->flags & IFF_LOOPBACK) &&
3ede0bbc 1016 !netif_is_l3_master(idev->dev) &&
d68b8270
YH		 1017 addr_type & IPV6_ADDR_LOOPBACK))
1018 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 1019
1da177e4
LT		 1020 if (idev->dead) {
1021 err = -ENODEV; /*XXX*/
f3d9832e 1022 goto out;
1da177e4
LT		 1023 }
1024
56d417b1 1025 if (idev->cnf.disable_ipv6) {
9bdd8d40 1026 err = -EACCES;
f3d9832e 1027 goto out;
9bdd8d40
BH		 1028 }
1029
ff7883ea
DA		 1030 /* validator notifier needs to be blocking;
1031 * do not call in atomic context
1032 */
1033 if (can_block) {
1034 struct in6_validator_info i6vi = {
e6464b8c 1035 .i6vi_addr = *cfg->pfx,
ff7883ea 1036 .i6vi_dev = idev,
de95e047 1037 .extack = extack,
ff7883ea
DA		 1038 };
1039
1040 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1041 err = notifier_to_errno(err);
1042 if (err < 0)
1043 goto out;
1044 }
1da177e4 1045
f3d9832e 1046 ifa = kzalloc(sizeof(*ifa), gfp_flags);
63159f29 1047 if (!ifa) {
1da177e4
LT		 1048 err = -ENOBUFS;
1049 goto out;
1050 }
1051
e6464b8c 1052 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
360a9887
DA		 1053 if (IS_ERR(f6i)) {
1054 err = PTR_ERR(f6i);
1055 f6i = NULL;
1da177e4
LT		 1056 goto out;
1057 }
1058
df789fe7
DF		 1059 if (net->ipv6.devconf_all->disable_policy ||
1060 idev->cnf.disable_policy)
360a9887 1061 f6i->dst_nopolicy = true;
df789fe7 1062
bba24896
JP		 1063 neigh_parms_data_state_setall(idev->nd_parms);
1064
e6464b8c
DA		 1065 ifa->addr = *cfg->pfx;
1066 if (cfg->peer_pfx)
1067 ifa->peer_addr = *cfg->peer_pfx;
1da177e4
LT		 1068
1069 spin_lock_init(&ifa->lock);
c15b1cca 1070 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 1071 INIT_HLIST_NODE(&ifa->addr_lst);
e6464b8c
DA		 1072 ifa->scope = cfg->scope;
1073 ifa->prefix_len = cfg->plen;
8308f3ff 1074 ifa->rt_priority = cfg->rt_priority;
e6464b8c 1075 ifa->flags = cfg->ifa_flags;
66eb9f86 1076 /* No need to add the TENTATIVE flag for addresses with NODAD */
e6464b8c 1077 if (!(cfg->ifa_flags & IFA_F_NODAD))
66eb9f86 1078 ifa->flags |= IFA_F_TENTATIVE;
e6464b8c
DA		 1079 ifa->valid_lft = cfg->valid_lft;
1080 ifa->prefered_lft = cfg->preferred_lft;
1da177e4 1081 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 1082 ifa->tokenized = false;
1da177e4 1083
360a9887 1084 ifa->rt = f6i;
57f5f544 1085
1da177e4 1086 ifa->idev = idev;
f3d9832e
DA		 1087 in6_dev_hold(idev);
1088
1da177e4 1089 /* For caller */
271201c0 1090 refcount_set(&ifa->refcnt, 1);
1da177e4 1091
f3d9832e 1092 rcu_read_lock_bh();
1da177e4 1093
f3d9832e
DA		 1094 err = ipv6_add_addr_hash(idev->dev, ifa);
1095 if (err < 0) {
1096 rcu_read_unlock_bh();
1097 goto out;
1098 }
1da177e4
LT		 1099
1100 write_lock(&idev->lock);
f3d9832e 1101
1da177e4 1102 /* Add to inet6_dev unicast addr list. */
e55ffac6 1103 ipv6_link_dev_addr(idev, ifa);
1da177e4 1104
1da177e4 1105 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 1106 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 1107 in6_ifa_hold(ifa);
1108 }
1da177e4 1109
1da177e4
LT		 1110 in6_ifa_hold(ifa);
1111 write_unlock(&idev->lock);
f3d9832e 1112
8814c4b5 1113 rcu_read_unlock_bh();
1da177e4 1114
f3d9832e
DA		 1115 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1116out:
1117 if (unlikely(err < 0)) {
360a9887 1118 fib6_info_release(f6i);
93531c67 1119
f3d9832e
DA		 1120 if (ifa) {
1121 if (ifa->idev)
1122 in6_dev_put(ifa->idev);
1123 kfree(ifa);
1124 }
1da177e4
LT		 1125 ifa = ERR_PTR(err);
1126 }
1127
1128 return ifa;
1da177e4
LT		 1129}
1130
5b84efec
TH		 1131enum cleanup_prefix_rt_t {
1132 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1133 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1134 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1135};
1136
1137/*
1138 * Check, whether the prefix for ifp would still need a prefix route
1139 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1140 * constants.
1141 *
1142 * 1) we don't purge prefix if address was not permanent.
1143 * prefix is managed by its own lifetime.
1144 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1145 * 3) if there are no addresses, delete prefix.
1146 * 4) if there are still other permanent address(es),
1147 * corresponding prefix is still permanent.
1148 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1149 * don't purge the prefix, assume user space is managing it.
1150 * 6) otherwise, update prefix lifetime to the
1151 * longest valid lifetime among the corresponding
1152 * addresses on the device.
1153 * Note: subsequent RA will update lifetime.
1154 **/
1155static enum cleanup_prefix_rt_t
1156check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1157{
1158 struct inet6_ifaddr *ifa;
1159 struct inet6_dev *idev = ifp->idev;
1160 unsigned long lifetime;
1161 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1162
1163 *expires = jiffies;
1164
1165 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1166 if (ifa == ifp)
1167 continue;
1168 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1169 ifp->prefix_len))
1170 continue;
1171 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1172 return CLEANUP_PREFIX_RT_NOP;
1173
1174 action = CLEANUP_PREFIX_RT_EXPIRE;
1175
1176 spin_lock(&ifa->lock);
1177
1178 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1179 /*
1180 * Note: Because this address is
1181 * not permanent, lifetime <
1182 * LONG_MAX / HZ here.
1183 */
1184 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1185 *expires = ifa->tstamp + lifetime * HZ;
1186 spin_unlock(&ifa->lock);
1187 }
1188
1189 return action;
1190}
1191
1192static void
1193cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1194{
93c2fb25 1195 struct fib6_info *f6i;
5b84efec 1196
93c2fb25 1197 f6i = addrconf_get_prefix_route(&ifp->addr,
5b84efec
TH		 1198 ifp->prefix_len,
1199 ifp->idev->dev,
1200 0, RTF_GATEWAY | RTF_DEFAULT);
93c2fb25 1201 if (f6i) {
5b84efec 1202 if (del_rt)
93c2fb25 1203 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
5b84efec 1204 else {
93c2fb25
DA		 1205 if (!(f6i->fib6_flags & RTF_EXPIRES))
1206 fib6_set_expires(f6i, expires);
1207 fib6_info_release(f6i);
5b84efec
TH		 1208 }
1209 }
1210}
1211
1212
1da177e4
LT		 1213/* This function wants to get referenced ifp and releases it before return */
1214
1215static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1216{
4c5ff6a6 1217 int state;
5b84efec
TH		 1218 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1219 unsigned long expires;
1da177e4 1220
c15b1cca
HFS		 1221 ASSERT_RTNL();
1222
8e8e676d 1223 spin_lock_bh(&ifp->lock);
4c5ff6a6 1224 state = ifp->state;
e9d3e084 1225 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1226 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1227
1228 if (state == INET6_IFADDR_STATE_DEAD)
1229 goto out;
1da177e4 1230
5c578aed 1231 spin_lock_bh(&addrconf_hash_lock);
1232 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1233 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1234
5b84efec 1235 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1236
1da177e4 1237 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1238 list_del(&ifp->tmp_list);
1239 if (ifp->ifpub) {
1240 in6_ifa_put(ifp->ifpub);
1241 ifp->ifpub = NULL;
1da177e4 1242 }
372e6c8f 1243 __in6_ifa_put(ifp);
1da177e4 1244 }
1da177e4 1245
5b84efec
TH		 1246 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1247 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1248
8ef802aa 1249 list_del_rcu(&ifp->if_list);
5b84efec
TH		 1250 __in6_ifa_put(ifp);
1251
1252 write_unlock_bh(&ifp->idev->lock);
1da177e4 1253
c15b1cca 1254 addrconf_del_dad_work(ifp);
b2238566 1255
1da177e4
LT		 1256 ipv6_ifa_notify(RTM_DELADDR, ifp);
1257
f88c91dd 1258 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1259
5b84efec
TH		 1260 if (action != CLEANUP_PREFIX_RT_NOP) {
1261 cleanup_prefix_route(ifp, expires,
1262 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1263 }
1264
c3968a85
DW		 1265 /* clean up prefsrc entries */
1266 rt6_remove_prefsrc(ifp);
4c5ff6a6 1267out:
1da177e4
LT		 1268 in6_ifa_put(ifp);
1269}
1270
fffcefe9
ED		 1271static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp,
1272 struct inet6_ifaddr *ift,
1273 bool block)
1da177e4
LT		 1274{
1275 struct inet6_dev *idev = ifp->idev;
1276 struct in6_addr addr, *tmpaddr;
e6464b8c 1277 unsigned long tmp_tstamp, age;
eac55bf9 1278 unsigned long regen_advance;
e6464b8c 1279 struct ifa6_config cfg;
1da177e4 1280 int ret = 0;
76f793e3 1281 unsigned long now = jiffies;
76506a98 1282 long max_desync_factor;
7aa8e63f 1283 s32 cnf_temp_preferred_lft;
1da177e4 1284
53bd6749 1285 write_lock_bh(&idev->lock);
1da177e4
LT		 1286 if (ift) {
1287 spin_lock_bh(&ift->lock);
1288 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1289 spin_unlock_bh(&ift->lock);
1290 tmpaddr = &addr;
1291 } else {
1292 tmpaddr = NULL;
1293 }
1294retry:
1295 in6_dev_hold(idev);
1296 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1297 write_unlock_bh(&idev->lock);
f3213831 1298 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1299 in6_dev_put(idev);
1300 ret = -1;
1301 goto out;
1302 }
1303 spin_lock_bh(&ifp->lock);
1304 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1305 idev->cnf.use_tempaddr = -1; /*XXX*/
1306 spin_unlock_bh(&ifp->lock);
53bd6749 1307 write_unlock_bh(&idev->lock);
f3213831
JP		 1308 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1309 __func__);
1da177e4
LT		 1310 in6_dev_put(idev);
1311 ret = -1;
1312 goto out;
1313 }
1314 in6_ifa_hold(ifp);
1315 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
9d6280da 1316 ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1317 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1318 age = (now - ifp->tstamp) / HZ;
76506a98
JB		 1319
1320 regen_advance = idev->cnf.regen_max_retry *
1321 idev->cnf.dad_transmits *
1322 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1323
1324 /* recalculate max_desync_factor each time and update
1325 * idev->desync_factor if it's larger
1326 */
7aa8e63f 1327 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
76506a98
JB		 1328 max_desync_factor = min_t(__u32,
1329 idev->cnf.max_desync_factor,
7aa8e63f 1330 cnf_temp_preferred_lft - regen_advance);
76506a98
JB		 1331
1332 if (unlikely(idev->desync_factor > max_desync_factor)) {
1333 if (max_desync_factor > 0) {
1334 get_random_bytes(&idev->desync_factor,
1335 sizeof(idev->desync_factor));
1336 idev->desync_factor %= max_desync_factor;
1337 } else {
1338 idev->desync_factor = 0;
1339 }
1340 }
1341
3f2d67b6 1342 memset(&cfg, 0, sizeof(cfg));
e6464b8c 1343 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
7a876b0e 1344 idev->cnf.temp_valid_lft + age);
e6464b8c
DA		 1345 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1346 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1347
1348 cfg.plen = ifp->prefix_len;
1da177e4
LT		 1349 tmp_tstamp = ifp->tstamp;
1350 spin_unlock_bh(&ifp->lock);
1351
53bd6749 1352 write_unlock_bh(&idev->lock);
95c385b4 1353
eac55bf9
BB		 1354 /* A temporary address is created only if this calculated Preferred
1355 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1356 * an implementation must not create a temporary address with a zero
1357 * Preferred Lifetime.
ecab6701
HK		 1358 * Use age calculation as in addrconf_verify to avoid unnecessary
1359 * temporary addresses being generated.
eac55bf9 1360 */
ecab6701 1361 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
e6464b8c 1362 if (cfg.preferred_lft <= regen_advance + age) {
eac55bf9
BB		 1363 in6_ifa_put(ifp);
1364 in6_dev_put(idev);
1365 ret = -1;
1366 goto out;
1367 }
1368
e6464b8c 1369 cfg.ifa_flags = IFA_F_TEMPORARY;
95c385b4
NH		 1370 /* set in addrconf_prefix_rcv() */
1371 if (ifp->flags & IFA_F_OPTIMISTIC)
e6464b8c 1372 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
95c385b4 1373
e6464b8c
DA		 1374 cfg.pfx = &addr;
1375 cfg.scope = ipv6_addr_scope(cfg.pfx);
95c385b4 1376
e6464b8c 1377 ift = ipv6_add_addr(idev, &cfg, block, NULL);
4b08a8f1 1378 if (IS_ERR(ift)) {
1da177e4
LT		 1379 in6_ifa_put(ifp);
1380 in6_dev_put(idev);
f3213831 1381 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1382 tmpaddr = &addr;
53bd6749 1383 write_lock_bh(&idev->lock);
1da177e4
LT		 1384 goto retry;
1385 }
1386
1387 spin_lock_bh(&ift->lock);
1388 ift->ifpub = ifp;
76f793e3 1389 ift->cstamp = now;
1da177e4
LT		 1390 ift->tstamp = tmp_tstamp;
1391 spin_unlock_bh(&ift->lock);
1392
cf22f9a2 1393 addrconf_dad_start(ift);
1da177e4
LT		 1394 in6_ifa_put(ift);
1395 in6_dev_put(idev);
1396out:
1397 return ret;
1398}
1da177e4
LT		 1399
1400/*
072047e4 1401 * Choose an appropriate source address (RFC3484)
1da177e4 1402 */
a9b05723
YH		 1403enum {
1404 IPV6_SADDR_RULE_INIT = 0,
1405 IPV6_SADDR_RULE_LOCAL,
1406 IPV6_SADDR_RULE_SCOPE,
1407 IPV6_SADDR_RULE_PREFERRED,
1408#ifdef CONFIG_IPV6_MIP6
1409 IPV6_SADDR_RULE_HOA,
1410#endif
1411 IPV6_SADDR_RULE_OIF,
1412 IPV6_SADDR_RULE_LABEL,
a9b05723 1413 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1414 IPV6_SADDR_RULE_ORCHID,
1415 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1416#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1417 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1418#endif
a9b05723
YH		 1419 IPV6_SADDR_RULE_MAX
1420};
1421
072047e4 1422struct ipv6_saddr_score {
a9b05723
YH		 1423 int rule;
1424 int addr_type;
1425 struct inet6_ifaddr *ifa;
1426 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1427 int scopedist;
1428 int matchlen;
072047e4
YH		 1429};
1430
a9b05723 1431struct ipv6_saddr_dst {
9acd9f3a 1432 const struct in6_addr *addr;
a9b05723
YH		 1433 int ifindex;
1434 int scope;
1435 int label;
7cbca67c 1436 unsigned int prefs;
a9b05723 1437};
072047e4 1438
b6f99a21 1439static inline int ipv6_saddr_preferred(int type)
1da177e4 1440{
45bb0060 1441 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1442 return 1;
1443 return 0;
1da177e4
LT		 1444}
1445
35e015e1
MC		 1446static bool ipv6_use_optimistic_addr(struct net *net,
1447 struct inet6_dev *idev)
7fd2561e
EK		 1448{
1449#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 1450 if (!idev)
1451 return false;
1452 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1453 return false;
1454 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1455 return false;
1456
1457 return true;
7fd2561e
EK		 1458#else
1459 return false;
1460#endif
1461}
1462
f1c02cfb
SD		 1463static bool ipv6_allow_optimistic_dad(struct net *net,
1464 struct inet6_dev *idev)
1465{
1466#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1467 if (!idev)
1468 return false;
1469 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1470 return false;
1471
1472 return true;
1473#else
1474 return false;
1475#endif
1476}
1477
3de23255
BT		 1478static int ipv6_get_saddr_eval(struct net *net,
1479 struct ipv6_saddr_score *score,
a9b05723
YH		 1480 struct ipv6_saddr_dst *dst,
1481 int i)
1482{
1483 int ret;
1484
1485 if (i <= score->rule) {
1486 switch (i) {
1487 case IPV6_SADDR_RULE_SCOPE:
1488 ret = score->scopedist;
1489 break;
1490 case IPV6_SADDR_RULE_PREFIX:
1491 ret = score->matchlen;
1492 break;
1493 default:
1494 ret = !!test_bit(i, score->scorebits);
1495 }
1496 goto out;
1497 }
1498
1499 switch (i) {
1500 case IPV6_SADDR_RULE_INIT:
1501 /* Rule 0: remember if hiscore is not ready yet */
1502 ret = !!score->ifa;
1503 break;
1504 case IPV6_SADDR_RULE_LOCAL:
1505 /* Rule 1: Prefer same address */
1506 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1507 break;
1508 case IPV6_SADDR_RULE_SCOPE:
1509 /* Rule 2: Prefer appropriate scope
1510 *
1511 * ret
1512 * ^
1513 * -1 | d 15
1514 * ---+--+-+---> scope
1515 * |
1516 * | d is scope of the destination.
1517 * B-d | \
1518 * | \ <- smaller scope is better if
db9c7c39 1519 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1520 * | ret = B - scope (-1 <= scope >= d <= 15).
1521 * d-C-1 | /
1522 * |/ <- greater is better
1523 * -C / if scope is not enough for destination.
1524 * /| ret = scope - C (-1 <= d < scope <= 15).
1525 *
1526 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1527 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1528 * Assume B = 0 and we get C > 29.
1529 */
1530 ret = __ipv6_addr_src_scope(score->addr_type);
1531 if (ret >= dst->scope)
1532 ret = -ret;
1533 else
1534 ret -= 128; /* 30 is enough */
1535 score->scopedist = ret;
1536 break;
1537 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1538 {
a9b05723 1539 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1540 u8 avoid = IFA_F_DEPRECATED;
1541
35e015e1 1542 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
7fd2561e 1543 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1544 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1545 !(score->ifa->flags & avoid);
a9b05723 1546 break;
7fd2561e 1547 }
a9b05723
YH		 1548#ifdef CONFIG_IPV6_MIP6
1549 case IPV6_SADDR_RULE_HOA:
7cbca67c 1550 {
a9b05723 1551 /* Rule 4: Prefer home address */
7cbca67c
YH		 1552 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1553 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1554 break;
7cbca67c 1555 }
a9b05723
YH		 1556#endif
1557 case IPV6_SADDR_RULE_OIF:
1558 /* Rule 5: Prefer outgoing interface */
1559 ret = (!dst->ifindex ||
1560 dst->ifindex == score->ifa->idev->dev->ifindex);
1561 break;
1562 case IPV6_SADDR_RULE_LABEL:
1563 /* Rule 6: Prefer matching label */
3de23255
BT		 1564 ret = ipv6_addr_label(net,
1565 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1566 score->ifa->idev->dev->ifindex) == dst->label;
1567 break;
a9b05723 1568 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1569 {
a9b05723 1570 /* Rule 7: Prefer public address
25985edc 1571 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1572 */
7cbca67c
YH		 1573 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1574 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1575 score->ifa->idev->cnf.use_tempaddr >= 2;
1576 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1577 break;
7cbca67c 1578 }
a9b05723
YH		 1579 case IPV6_SADDR_RULE_ORCHID:
1580 /* Rule 8-: Prefer ORCHID vs ORCHID or
1581 * non-ORCHID vs non-ORCHID
1582 */
1583 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1584 ipv6_addr_orchid(dst->addr));
1585 break;
1586 case IPV6_SADDR_RULE_PREFIX:
1587 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1588 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1589 if (ret > score->ifa->prefix_len)
1590 ret = score->ifa->prefix_len;
1591 score->matchlen = ret;
a9b05723 1592 break;
7fd2561e
EK		 1593#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1594 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1595 /* Optimistic addresses still have lower precedence than other
1596 * preferred addresses.
1597 */
1598 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1599 break;
1600#endif
a9b05723
YH		 1601 default:
1602 ret = 0;
1603 }
1604
1605 if (ret)
1606 __set_bit(i, score->scorebits);
1607 score->rule = i;
1608out:
1609 return ret;
1610}
1611
c0b8da1e
YH		 1612static int __ipv6_dev_get_saddr(struct net *net,
1613 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1614 struct inet6_dev *idev,
1615 struct ipv6_saddr_score *scores,
1616 int hiscore_idx)
9131f3de 1617{
c0b8da1e 1618 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de 1619
f59c031e 1620 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
9131f3de
YH		 1621 int i;
1622
1623 /*
1624 * - Tentative Address (RFC2462 section 5.4)
1625 * - A tentative address is not considered
1626 * "assigned to an interface" in the traditional
1627 * sense, unless it is also flagged as optimistic.
1628 * - Candidate Source Address (section 4)
1629 * - In any case, anycast addresses, multicast
1630 * addresses, and the unspecified address MUST
1631 * NOT be included in a candidate set.
1632 */
1633 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1634 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1635 continue;
1636
1637 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1638
1639 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1640 score->addr_type & IPV6_ADDR_MULTICAST)) {
1641 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1642 idev->dev->name);
1643 continue;
1644 }
1645
1646 score->rule = -1;
1647 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1648
1649 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1650 int minihiscore, miniscore;
1651
1652 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1653 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1654
1655 if (minihiscore > miniscore) {
1656 if (i == IPV6_SADDR_RULE_SCOPE &&
1657 score->scopedist > 0) {
1658 /*
1659 * special case:
1660 * each remaining entry
1661 * has too small (not enough)
1662 * scope, because ifa entries
1663 * are sorted by their scope
1664 * values.
1665 */
1666 goto out;
1667 }
1668 break;
1669 } else if (minihiscore < miniscore) {
9131f3de 1670 swap(hiscore, score);
c0b8da1e 1671 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1672
1673 /* restore our iterator */
1674 score->ifa = hiscore->ifa;
1675
1676 break;
1677 }
1678 }
1679 }
1680out:
c0b8da1e 1681 return hiscore_idx;
9131f3de
YH		 1682}
1683
afbac601
DA		 1684static int ipv6_get_saddr_master(struct net *net,
1685 const struct net_device *dst_dev,
1686 const struct net_device *master,
1687 struct ipv6_saddr_dst *dst,
1688 struct ipv6_saddr_score *scores,
1689 int hiscore_idx)
1690{
1691 struct inet6_dev *idev;
1692
1693 idev = __in6_dev_get(dst_dev);
1694 if (idev)
1695 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1696 scores, hiscore_idx);
1697
1698 idev = __in6_dev_get(master);
1699 if (idev)
1700 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1701 scores, hiscore_idx);
1702
1703 return hiscore_idx;
1704}
1705
b3f644fc 1706int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1707 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1708 struct in6_addr *saddr)
1da177e4 1709{
c0b8da1e 1710 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1711 struct ipv6_saddr_dst dst;
9131f3de 1712 struct inet6_dev *idev;
072047e4 1713 struct net_device *dev;
a9b05723 1714 int dst_type;
9131f3de 1715 bool use_oif_addr = false;
c0b8da1e 1716 int hiscore_idx = 0;
cc429c8f 1717 int ret = 0;
1da177e4 1718
a9b05723
YH		 1719 dst_type = __ipv6_addr_type(daddr);
1720 dst.addr = daddr;
1721 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1722 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1723 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1724 dst.prefs = prefs;
a9b05723 1725
c0b8da1e
YH		 1726 scores[hiscore_idx].rule = -1;
1727 scores[hiscore_idx].ifa = NULL;
1da177e4 1728
8814c4b5 1729 rcu_read_lock();
1da177e4 1730
9131f3de
YH		 1731 /* Candidate Source Address (section 4)
1732 * - multicast and link-local destination address,
1733 * the set of candidate source address MUST only
1734 * include addresses assigned to interfaces
1735 * belonging to the same link as the outgoing
1736 * interface.
1737 * (- For site-local destination addresses, the
1738 * set of candidate source addresses MUST only
1739 * include addresses assigned to interfaces
1740 * belonging to the same site as the outgoing
1741 * interface.)
3985e8a3
EK		 1742 * - "It is RECOMMENDED that the candidate source addresses
1743 * be the set of unicast addresses assigned to the
1744 * interface that will be used to send to the destination
1745 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1746 */
1747 if (dst_dev) {
3985e8a3 1748 idev = __in6_dev_get(dst_dev);
9131f3de 1749 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1750 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1751 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1752 use_oif_addr = true;
1753 }
1754 }
a9b05723 1755
9131f3de 1756 if (use_oif_addr) {
c0b8da1e 1757 if (idev)
c15df306 1758 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de 1759 } else {
afbac601
DA		 1760 const struct net_device *master;
1761 int master_idx = 0;
1762
1763 /* if dst_dev exists and is enslaved to an L3 device, then
1764 * prefer addresses from dst_dev and then the master over
1765 * any other enslaved devices in the L3 domain.
1766 */
1767 master = l3mdev_master_dev_rcu(dst_dev);
1768 if (master) {
1769 master_idx = master->ifindex;
1770
1771 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1772 master, &dst,
1773 scores, hiscore_idx);
1774
1775 if (scores[hiscore_idx].ifa)
1776 goto out;
1777 }
1778
9131f3de 1779 for_each_netdev_rcu(net, dev) {
afbac601
DA		 1780 /* only consider addresses on devices in the
1781 * same L3 domain
1782 */
1783 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1784 continue;
9131f3de
YH		 1785 idev = __in6_dev_get(dev);
1786 if (!idev)
072047e4 1787 continue;
c15df306 1788 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1789 }
1790 }
afbac601
DA		 1791
1792out:
c0b8da1e 1793 hiscore = &scores[hiscore_idx];
a9b05723 1794 if (!hiscore->ifa)
cc429c8f
ED		 1795 ret = -EADDRNOTAVAIL;
1796 else
1797 *saddr = hiscore->ifa->addr;
1ab1457c 1798
cc429c8f
ED		 1799 rcu_read_unlock();
1800 return ret;
1da177e4 1801}
5e5f3f0f 1802EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1803
8965779d 1804int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1805 u32 banned_flags)
b7b1bfce
HFS		 1806{
1807 struct inet6_ifaddr *ifp;
1808 int err = -EADDRNOTAVAIL;
1809
602582ca
HFS		 1810 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1811 if (ifp->scope > IFA_LINK)
1812 break;
b7b1bfce
HFS		 1813 if (ifp->scope == IFA_LINK &&
1814 !(ifp->flags & banned_flags)) {
1815 *addr = ifp->addr;
1816 err = 0;
1817 break;
1818 }
1819 }
1820 return err;
1821}
1822
95c385b4 1823int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1824 u32 banned_flags)
1da177e4
LT		 1825{
1826 struct inet6_dev *idev;
1827 int err = -EADDRNOTAVAIL;
1828
8814c4b5 1829 rcu_read_lock();
e21e8467
SH		 1830 idev = __in6_dev_get(dev);
1831 if (idev) {
1da177e4 1832 read_lock_bh(&idev->lock);
b7b1bfce 1833 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1834 read_unlock_bh(&idev->lock);
1835 }
8814c4b5 1836 rcu_read_unlock();
1da177e4
LT		 1837 return err;
1838}
1839
d9bf82c2 1840static int ipv6_count_addresses(const struct inet6_dev *idev)
1da177e4 1841{
d9bf82c2 1842 const struct inet6_ifaddr *ifp;
1da177e4 1843 int cnt = 0;
1da177e4 1844
d9bf82c2
ED		 1845 rcu_read_lock();
1846 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1da177e4 1847 cnt++;
d9bf82c2 1848 rcu_read_unlock();
1da177e4
LT		 1849 return cnt;
1850}
1851
b71d1d42 1852int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1853 const struct net_device *dev, int strict)
c58da4c6 1854{
232378e8
DA		 1855 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1856 strict, IFA_F_TENTATIVE);
c58da4c6
EK		 1857}
1858EXPORT_SYMBOL(ipv6_chk_addr);
1859
1893ff20
DA		 1860/* device argument is used to find the L3 domain of interest. If
1861 * skip_dev_check is set, then the ifp device is not checked against
1862 * the passed in dev argument. So the 2 cases for addresses checks are:
1863 * 1. does the address exist in the L3 domain that dev is part of
1864 * (skip_dev_check = true), or
1865 *
1866 * 2. does the address exist on the specific device
1867 * (skip_dev_check = false)
1868 */
c58da4c6 1869int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
232378e8
DA		 1870 const struct net_device *dev, bool skip_dev_check,
1871 int strict, u32 banned_flags)
1da177e4 1872{
3f27fb23 1873 unsigned int hash = inet6_addr_hash(net, addr);
1893ff20 1874 const struct net_device *l3mdev;
eedf042a 1875 struct inet6_ifaddr *ifp;
c58da4c6 1876 u32 ifp_flags;
1da177e4 1877
480318a0 1878 rcu_read_lock();
232378e8 1879
1893ff20 1880 l3mdev = l3mdev_master_dev_rcu(dev);
232378e8
DA		 1881 if (skip_dev_check)
1882 dev = NULL;
1883
b67bfe0d 1884 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1885 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1886 continue;
1893ff20
DA		 1887
1888 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev)
1889 continue;
1890
c58da4c6
EK		 1891 /* Decouple optimistic from tentative for evaluation here.
1892 * Ban optimistic addresses explicitly, when required.
1893 */
1894 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1895 ? (ifp->flags&~IFA_F_TENTATIVE)
1896 : ifp->flags;
1da177e4 1897 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1898 !(ifp_flags&banned_flags) &&
63159f29 1899 (!dev || ifp->idev->dev == dev ||
eedf042a 1900 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
480318a0 1901 rcu_read_unlock();
eedf042a 1902 return 1;
1da177e4
LT		 1903 }
1904 }
5c578aed 1905
480318a0 1906 rcu_read_unlock();
eedf042a 1907 return 0;
1da177e4 1908}
c58da4c6 1909EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1910
1da177e4 1911
7df37ff3
CB		 1912/* Compares an address/prefix_len with addresses on device @dev.
1913 * If one is found it returns true.
1914 */
1915bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1916 const unsigned int prefix_len, struct net_device *dev)
1917{
47e26941
ED		 1918 const struct inet6_ifaddr *ifa;
1919 const struct inet6_dev *idev;
7df37ff3
CB		 1920 bool ret = false;
1921
1922 rcu_read_lock();
1923 idev = __in6_dev_get(dev);
1924 if (idev) {
47e26941 1925 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
7df37ff3
CB		 1926 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1927 if (ret)
1928 break;
1929 }
7df37ff3
CB		 1930 }
1931 rcu_read_unlock();
1932
1933 return ret;
1934}
1935EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1936
b71d1d42 1937int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84 1938{
24ba333b
ED		 1939 const struct inet6_ifaddr *ifa;
1940 const struct inet6_dev *idev;
52eeeb84
YH		 1941 int onlink;
1942
1943 onlink = 0;
1944 rcu_read_lock();
1945 idev = __in6_dev_get(dev);
1946 if (idev) {
24ba333b 1947 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1948 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1949 ifa->prefix_len);
1950 if (onlink)
1951 break;
1952 }
52eeeb84
YH		 1953 }
1954 rcu_read_unlock();
1955 return onlink;
1956}
52eeeb84
YH		 1957EXPORT_SYMBOL(ipv6_chk_prefix);
1958
9acd9f3a 1959struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1960 struct net_device *dev, int strict)
1da177e4 1961{
3f27fb23 1962 unsigned int hash = inet6_addr_hash(net, addr);
b79d1d54 1963 struct inet6_ifaddr *ifp, *result = NULL;
1da177e4 1964
24f226da
ED		 1965 rcu_read_lock();
1966 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1967 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1968 continue;
1da177e4 1969 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1970 if (!dev || ifp->idev->dev == dev ||
1da177e4 1971 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1972 result = ifp;
1da177e4
LT		 1973 in6_ifa_hold(ifp);
1974 break;
1975 }
1976 }
1977 }
24f226da 1978 rcu_read_unlock();
1da177e4 1979
b79d1d54 1980 return result;
1da177e4
LT		 1981}
1982
1da177e4
LT		 1983/* Gets referenced address, destroys ifaddr */
1984
cc411d0b 1985static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1986{
3d171f39
LR		 1987 if (dad_failed)
1988 ifp->flags |= IFA_F_DADFAILED;
1989
ec8add2a 1990 if (ifp->flags&IFA_F_TEMPORARY) {
1da177e4
LT		 1991 struct inet6_ifaddr *ifpub;
1992 spin_lock_bh(&ifp->lock);
1993 ifpub = ifp->ifpub;
1994 if (ifpub) {
1995 in6_ifa_hold(ifpub);
1996 spin_unlock_bh(&ifp->lock);
fffcefe9 1997 ipv6_create_tempaddr(ifpub, ifp, true);
1da177e4
LT		 1998 in6_ifa_put(ifpub);
1999 } else {
2000 spin_unlock_bh(&ifp->lock);
2001 }
2002 ipv6_del_addr(ifp);
ec8add2a
SD		 2003 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2004 spin_lock_bh(&ifp->lock);
2005 addrconf_del_dad_work(ifp);
2006 ifp->flags |= IFA_F_TENTATIVE;
f1c02cfb
SD		 2007 if (dad_failed)
2008 ifp->flags &= ~IFA_F_OPTIMISTIC;
ec8add2a
SD		 2009 spin_unlock_bh(&ifp->lock);
2010 if (dad_failed)
2011 ipv6_ifa_notify(0, ifp);
2012 in6_ifa_put(ifp);
c15b1cca 2013 } else {
1da177e4 2014 ipv6_del_addr(ifp);
c15b1cca 2015 }
1da177e4
LT		 2016}
2017
f2344a13
HX		 2018static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2019{
2020 int err = -ENOENT;
2021
8e8e676d 2022 spin_lock_bh(&ifp->lock);
f2344a13
HX		 2023 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2024 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2025 err = 0;
2026 }
8e8e676d 2027 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 2028
2029 return err;
2030}
2031
da13c59b 2032void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
3c21edbd 2033{
1b34be74 2034 struct inet6_dev *idev = ifp->idev;
1855b7c3 2035 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 2036
853dc2e0
UB		 2037 if (addrconf_dad_end(ifp)) {
2038 in6_ifa_put(ifp);
f2344a13 2039 return;
853dc2e0 2040 }
f2344a13 2041
da13c59b
VP		 2042 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2043 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
9bdd8d40 2044
5f40ef77
HFS		 2045 spin_lock_bh(&ifp->lock);
2046
2047 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
5f40ef77
HFS		 2048 struct in6_addr new_addr;
2049 struct inet6_ifaddr *ifp2;
5f40ef77 2050 int retries = ifp->stable_privacy_retry + 1;
e6464b8c
DA		 2051 struct ifa6_config cfg = {
2052 .pfx = &new_addr,
2053 .plen = ifp->prefix_len,
2054 .ifa_flags = ifp->flags,
2055 .valid_lft = ifp->valid_lft,
2056 .preferred_lft = ifp->prefered_lft,
2057 .scope = ifp->scope,
2058 };
5f40ef77 2059
1855b7c3 2060 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 2061 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2062 ifp->idev->dev->name);
2063 goto errdad;
2064 }
2065
2066 new_addr = ifp->addr;
2067 if (ipv6_generate_stable_address(&new_addr, retries,
2068 idev))
2069 goto errdad;
2070
5f40ef77 2071 spin_unlock_bh(&ifp->lock);
1b34be74 2072
5f40ef77
HFS		 2073 if (idev->cnf.max_addresses &&
2074 ipv6_count_addresses(idev) >=
2075 idev->cnf.max_addresses)
2076 goto lock_errdad;
2077
2078 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2079 ifp->idev->dev->name);
2080
e6464b8c 2081 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
5f40ef77
HFS		 2082 if (IS_ERR(ifp2))
2083 goto lock_errdad;
2084
2085 spin_lock_bh(&ifp2->lock);
2086 ifp2->stable_privacy_retry = retries;
2087 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2088 spin_unlock_bh(&ifp2->lock);
2089
1855b7c3 2090 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 2091 in6_ifa_put(ifp2);
2092lock_errdad:
2093 spin_lock_bh(&ifp->lock);
1b34be74
YH		 2094 }
2095
5f40ef77 2096errdad:
c15b1cca
HFS		 2097 /* transition from _POSTDAD to _ERRDAD */
2098 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 2099 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 2100
2101 addrconf_mod_dad_work(ifp, 0);
751eb6b6 2102 in6_ifa_put(ifp);
3c21edbd 2103}
1da177e4 2104
a9ed4a29
SD		 2105/* Join to solicited addr multicast group.
2106 * caller must hold RTNL */
b71d1d42 2107void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 2108{
2109 struct in6_addr maddr;
2110
2111 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2112 return;
2113
2114 addrconf_addr_solict_mult(addr, &maddr);
2115 ipv6_dev_mc_inc(dev, &maddr);
2116}
2117
a9ed4a29 2118/* caller must hold RTNL */
b71d1d42 2119void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 2120{
2121 struct in6_addr maddr;
2122
2123 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2124 return;
2125
2126 addrconf_addr_solict_mult(addr, &maddr);
2127 __ipv6_dev_mc_dec(idev, &maddr);
2128}
2129
a9ed4a29 2130/* caller must hold RTNL */
20380731 2131static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2132{
2133 struct in6_addr addr;
c15b1cca 2134
88ad3149 2135 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 2136 return;
1da177e4
LT		 2137 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2138 if (ipv6_addr_any(&addr))
2139 return;
013b4d90 2140 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 2141}
2142
a9ed4a29 2143/* caller must hold RTNL */
20380731 2144static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2145{
2146 struct in6_addr addr;
c15b1cca 2147
88ad3149 2148 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 2149 return;
1da177e4
LT		 2150 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2151 if (ipv6_addr_any(&addr))
2152 return;
2153 __ipv6_dev_ac_dec(ifp->idev, &addr);
2154}
2155
8a7a4b47 2156static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
06a4c1c5 2157{
8a7a4b47
AA		 2158 switch (dev->addr_len) {
2159 case ETH_ALEN:
9dae2e03
LAD		 2160 memcpy(eui, dev->dev_addr, 3);
2161 eui[3] = 0xFF;
2162 eui[4] = 0xFE;
2163 memcpy(eui + 5, dev->dev_addr + 3, 3);
2164 break;
8a7a4b47
AA		 2165 case EUI64_ADDR_LEN:
2166 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2167 eui[0] ^= 2;
2168 break;
2169 default:
06a4c1c5 2170 return -1;
8a7a4b47
AA		 2171 }
2172
06a4c1c5 2173 return 0;
2174}
2175
cb6bf355
YH		 2176static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2177{
2178 union fwnet_hwaddr *ha;
2179
2180 if (dev->addr_len != FWNET_ALEN)
2181 return -1;
2182
2183 ha = (union fwnet_hwaddr *)dev->dev_addr;
2184
2185 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2186 eui[0] ^= 2;
2187 return 0;
2188}
2189
073a8e0e
YH		 2190static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2191{
2192 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2193 if (dev->addr_len != ARCNET_ALEN)
2194 return -1;
2195 memset(eui, 0, 7);
8e5e8f30 2196 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 2197 return 0;
2198}
2199
2200static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2201{
2202 if (dev->addr_len != INFINIBAND_ALEN)
2203 return -1;
2204 memcpy(eui, dev->dev_addr + 12, 8);
2205 eui[0] |= 2;
2206 return 0;
2207}
2208
c61393ea 2209static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2210{
9af28511
SH		 2211 if (addr == 0)
2212 return -1;
dfd982ba
YH		 2213 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2214 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2215 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2216 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2217 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2218 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2219 eui[1] = 0;
2220 eui[2] = 0x5E;
2221 eui[3] = 0xFE;
2222 memcpy(eui + 4, &addr, 4);
2223 return 0;
2224}
dfd982ba
YH		 2225
2226static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2227{
2228 if (dev->priv_flags & IFF_ISATAP)
2229 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2230 return -1;
2231}
2232
aee80b54 2233static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2234{
2235 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2236}
2237
e837735e
ND		 2238static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2239{
2240 memcpy(eui, dev->perm_addr, 3);
2241 memcpy(eui + 5, dev->perm_addr + 3, 3);
2242 eui[3] = 0xFF;
2243 eui[4] = 0xFE;
2244 eui[0] ^= 2;
2245 return 0;
2246}
2247
1da177e4
LT		 2248static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2249{
2250 switch (dev->type) {
2251 case ARPHRD_ETHER:
2252 case ARPHRD_FDDI:
073a8e0e 2253 return addrconf_ifid_eui48(eui, dev);
1da177e4 2254 case ARPHRD_ARCNET:
073a8e0e 2255 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2256 case ARPHRD_INFINIBAND:
073a8e0e 2257 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2258 case ARPHRD_SIT:
dfd982ba 2259 return addrconf_ifid_sit(eui, dev);
aee80b54 2260 case ARPHRD_IPGRE:
45ce0fd1 2261 case ARPHRD_TUNNEL:
aee80b54 2262 return addrconf_ifid_gre(eui, dev);
e74bccb8 2263 case ARPHRD_6LOWPAN:
8a7a4b47 2264 return addrconf_ifid_6lowpan(eui, dev);
cb6bf355
YH		 2265 case ARPHRD_IEEE1394:
2266 return addrconf_ifid_ieee1394(eui, dev);
e837735e 2267 case ARPHRD_TUNNEL6:
45ce0fd1 2268 case ARPHRD_IP6GRE:
9deb441c 2269 case ARPHRD_RAWIP:
e837735e 2270 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2271 }
2272 return -1;
2273}
2274
2275static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2276{
2277 int err = -1;
2278 struct inet6_ifaddr *ifp;
2279
2280 read_lock_bh(&idev->lock);
602582ca
HFS		 2281 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2282 if (ifp->scope > IFA_LINK)
2283 break;
1da177e4
LT		 2284 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2285 memcpy(eui, ifp->addr.s6_addr+8, 8);
2286 err = 0;
2287 break;
2288 }
2289 }
2290 read_unlock_bh(&idev->lock);
2291 return err;
2292}
2293
1da177e4 2294/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
9d6280da 2295static void ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2296{
1da177e4 2297regen:
955189ef 2298 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2299 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2300
2301 /*
2302 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2303 * check if generated address is not inappropriate
2304 *
2305 * - Reserved subnet anycast (RFC 2526)
2306 * 11111101 11....11 1xxxxxxx
c7dc89c0 2307 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2308 * 00-00-5E-FE-xx-xx-xx-xx
2309 * - value 0
2310 * - XXX: already assigned to an address on the device
2311 */
1ab1457c 2312 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2313 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2314 (idev->rndid[7]&0x80))
2315 goto regen;
2316 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2317 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2318 goto regen;
2319 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2320 goto regen;
2321 }
1da177e4
LT		 2322}
2323
9d6280da 2324static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2325{
1da177e4 2326 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
9d6280da 2327 ipv6_regen_rndid(idev);
1da177e4 2328}
1da177e4
LT		 2329
2330/*
2331 * Add prefix route.
2332 */
2333
2334static void
8308f3ff
DA		 2335addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2336 struct net_device *dev, unsigned long expires,
2337 u32 flags, gfp_t gfp_flags)
1da177e4 2338{
86872cb5 2339 struct fib6_config cfg = {
ca254490 2340 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
8308f3ff 2341 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
86872cb5
TG		 2342 .fc_ifindex = dev->ifindex,
2343 .fc_expires = expires,
2344 .fc_dst_len = plen,
2345 .fc_flags = RTF_UP | flags,
c346dca1 2346 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2347 .fc_protocol = RTPROT_KERNEL,
e8478e80 2348 .fc_type = RTN_UNICAST,
86872cb5 2349 };
1da177e4 2350
4e3fd7a0 2351 cfg.fc_dst = *pfx;
1da177e4
LT		 2352
2353 /* Prevent useless cloning on PtP SIT.
2354 This thing is done here expecting that the whole
2355 class of non-broadcast devices need not cloning.
2356 */
07a93626 2357#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2358 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2359 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2360#endif
1da177e4 2361
acb54e3c 2362 ip6_route_add(&cfg, gfp_flags, NULL);
1da177e4
LT		 2363}
2364
14ef37b6 2365
8d1c802b 2366static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
14ef37b6
AH		 2367 int plen,
2368 const struct net_device *dev,
2369 u32 flags, u32 noflags)
2370{
2371 struct fib6_node *fn;
8d1c802b 2372 struct fib6_info *rt = NULL;
14ef37b6 2373 struct fib6_table *table;
ca254490 2374 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2375
ca254490 2376 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2377 if (!table)
14ef37b6
AH		 2378 return NULL;
2379
66f5d6ce 2380 rcu_read_lock();
38fbeeee 2381 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
14ef37b6
AH		 2382 if (!fn)
2383 goto out;
1f56a01f 2384
66f5d6ce 2385 for_each_fib6_node_rt_rcu(fn) {
5e670d84 2386 if (rt->fib6_nh.nh_dev->ifindex != dev->ifindex)
14ef37b6 2387 continue;
93c2fb25 2388 if ((rt->fib6_flags & flags) != flags)
14ef37b6 2389 continue;
93c2fb25 2390 if ((rt->fib6_flags & noflags) != 0)
14ef37b6 2391 continue;
e873e4b9
WW		 2392 if (!fib6_info_hold_safe(rt))
2393 continue;
14ef37b6
AH		 2394 break;
2395 }
2396out:
66f5d6ce 2397 rcu_read_unlock();
14ef37b6
AH		 2398 return rt;
2399}
2400
2401
1da177e4
LT		 2402/* Create "default" multicast route to the interface */
2403
2404static void addrconf_add_mroute(struct net_device *dev)
2405{
86872cb5 2406 struct fib6_config cfg = {
ca254490 2407 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2408 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2409 .fc_ifindex = dev->ifindex,
2410 .fc_dst_len = 8,
2411 .fc_flags = RTF_UP,
e8478e80 2412 .fc_type = RTN_UNICAST,
c346dca1 2413 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2414 };
2415
2416 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2417
e500c6d3 2418 ip6_route_add(&cfg, GFP_KERNEL, NULL);
1da177e4
LT		 2419}
2420
1da177e4
LT		 2421static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2422{
2423 struct inet6_dev *idev;
2424
2425 ASSERT_RTNL();
2426
e21e8467
SH		 2427 idev = ipv6_find_idev(dev);
2428 if (!idev)
64e724f6
BH		 2429 return ERR_PTR(-ENOBUFS);
2430
2431 if (idev->cnf.disable_ipv6)
2432 return ERR_PTR(-EACCES);
1da177e4
LT		 2433
2434 /* Add default multicast route */
ba46ee4c 2435 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
4af04aba 2436 addrconf_add_mroute(dev);
1da177e4 2437
1da177e4
LT		 2438 return idev;
2439}
2440
53bd6749
JP		 2441static void manage_tempaddrs(struct inet6_dev *idev,
2442 struct inet6_ifaddr *ifp,
2443 __u32 valid_lft, __u32 prefered_lft,
2444 bool create, unsigned long now)
2445{
2446 u32 flags;
2447 struct inet6_ifaddr *ift;
2448
2449 read_lock_bh(&idev->lock);
2450 /* update all temporary addresses in the list */
2451 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2452 int age, max_valid, max_prefered;
2453
2454 if (ifp != ift->ifpub)
2455 continue;
2456
2457 /* RFC 4941 section 3.3:
2458 * If a received option will extend the lifetime of a public
2459 * address, the lifetimes of temporary addresses should
2460 * be extended, subject to the overall constraint that no
2461 * temporary addresses should ever remain "valid" or "preferred"
2462 * for a time longer than (TEMP_VALID_LIFETIME) or
2463 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2464 */
2465 age = (now - ift->cstamp) / HZ;
2466 max_valid = idev->cnf.temp_valid_lft - age;
2467 if (max_valid < 0)
2468 max_valid = 0;
2469
2470 max_prefered = idev->cnf.temp_prefered_lft -
76506a98 2471 idev->desync_factor - age;
53bd6749
JP		 2472 if (max_prefered < 0)
2473 max_prefered = 0;
2474
2475 if (valid_lft > max_valid)
2476 valid_lft = max_valid;
2477
2478 if (prefered_lft > max_prefered)
2479 prefered_lft = max_prefered;
2480
2481 spin_lock(&ift->lock);
2482 flags = ift->flags;
2483 ift->valid_lft = valid_lft;
2484 ift->prefered_lft = prefered_lft;
2485 ift->tstamp = now;
2486 if (prefered_lft > 0)
2487 ift->flags &= ~IFA_F_DEPRECATED;
2488
2489 spin_unlock(&ift->lock);
2490 if (!(flags&IFA_F_TENTATIVE))
2491 ipv6_ifa_notify(0, ift);
2492 }
2493
2494 if ((create || list_empty(&idev->tempaddr_list)) &&
2495 idev->cnf.use_tempaddr > 0) {
2496 /* When a new public address is created as described
2497 * in [ADDRCONF], also create a new temporary address.
2498 * Also create a temporary address if it's enabled but
2499 * no temporary address currently exists.
2500 */
2501 read_unlock_bh(&idev->lock);
fffcefe9 2502 ipv6_create_tempaddr(ifp, NULL, false);
53bd6749
JP		 2503 } else {
2504 read_unlock_bh(&idev->lock);
2505 }
2506}
2507
cc9da6cc
BM		 2508static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2509{
d35a00b8
FJ		 2510 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2511 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc
BM		 2512}
2513
cc84b3c6
AA		 2514int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2515 const struct prefix_info *pinfo,
2516 struct inet6_dev *in6_dev,
2517 const struct in6_addr *addr, int addr_type,
2518 u32 addr_flags, bool sllao, bool tokenized,
2519 __u32 valid_lft, u32 prefered_lft)
4f672235
AA		 2520{
2521 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2522 int create = 0, update_lft = 0;
2523
2524 if (!ifp && valid_lft) {
2525 int max_addresses = in6_dev->cnf.max_addresses;
e6464b8c
DA		 2526 struct ifa6_config cfg = {
2527 .pfx = addr,
2528 .plen = pinfo->prefix_len,
2529 .ifa_flags = addr_flags,
2530 .valid_lft = valid_lft,
2531 .preferred_lft = prefered_lft,
2532 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2533 };
4f672235
AA		 2534
2535#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 2536 if ((net->ipv6.devconf_all->optimistic_dad ||
2537 in6_dev->cnf.optimistic_dad) &&
4f672235 2538 !net->ipv6.devconf_all->forwarding && sllao)
e6464b8c 2539 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
4f672235
AA		 2540#endif
2541
2542 /* Do not allow to create too much of autoconfigured
2543 * addresses; this would be too easy way to crash kernel.
2544 */
2545 if (!max_addresses ||
2546 ipv6_count_addresses(in6_dev) < max_addresses)
e6464b8c 2547 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
4f672235
AA		 2548
2549 if (IS_ERR_OR_NULL(ifp))
2550 return -1;
2551
4f672235
AA		 2552 create = 1;
2553 spin_lock_bh(&ifp->lock);
2554 ifp->flags |= IFA_F_MANAGETEMPADDR;
2555 ifp->cstamp = jiffies;
2556 ifp->tokenized = tokenized;
2557 spin_unlock_bh(&ifp->lock);
2558 addrconf_dad_start(ifp);
2559 }
2560
2561 if (ifp) {
2562 u32 flags;
2563 unsigned long now;
2564 u32 stored_lft;
2565
2566 /* update lifetime (RFC2462 5.5.3 e) */
2567 spin_lock_bh(&ifp->lock);
2568 now = jiffies;
2569 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2570 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2571 else
2572 stored_lft = 0;
f85f94b8 2573 if (!create && stored_lft) {
4f672235
AA		 2574 const u32 minimum_lft = min_t(u32,
2575 stored_lft, MIN_VALID_LIFETIME);
2576 valid_lft = max(valid_lft, minimum_lft);
2577
2578 /* RFC4862 Section 5.5.3e:
2579 * "Note that the preferred lifetime of the
2580 * corresponding address is always reset to
2581 * the Preferred Lifetime in the received
2582 * Prefix Information option, regardless of
2583 * whether the valid lifetime is also reset or
2584 * ignored."
2585 *
2586 * So we should always update prefered_lft here.
2587 */
2588 update_lft = 1;
2589 }
2590
2591 if (update_lft) {
2592 ifp->valid_lft = valid_lft;
2593 ifp->prefered_lft = prefered_lft;
2594 ifp->tstamp = now;
2595 flags = ifp->flags;
2596 ifp->flags &= ~IFA_F_DEPRECATED;
2597 spin_unlock_bh(&ifp->lock);
2598
2599 if (!(flags&IFA_F_TENTATIVE))
2600 ipv6_ifa_notify(0, ifp);
2601 } else
2602 spin_unlock_bh(&ifp->lock);
2603
2604 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2605 create, now);
2606
2607 in6_ifa_put(ifp);
2608 addrconf_verify();
2609 }
2610
2611 return 0;
2612}
cc84b3c6 2613EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
4f672235 2614
e6bff995 2615void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2616{
2617 struct prefix_info *pinfo;
2618 __u32 valid_lft;
2619 __u32 prefered_lft;
4f672235 2620 int addr_type, err;
64236f3f 2621 u32 addr_flags = 0;
1da177e4 2622 struct inet6_dev *in6_dev;
56d417b1 2623 struct net *net = dev_net(dev);
1da177e4
LT		 2624
2625 pinfo = (struct prefix_info *) opt;
1ab1457c 2626
1da177e4 2627 if (len < sizeof(struct prefix_info)) {
e32ac250 2628 netdev_dbg(dev, "addrconf: prefix option too short\n");
1da177e4
LT		 2629 return;
2630 }
1ab1457c 2631
1da177e4
LT		 2632 /*
2633 * Validation checks ([ADDRCONF], page 19)
2634 */
2635
2636 addr_type = ipv6_addr_type(&pinfo->prefix);
2637
2638 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2639 return;
2640
2641 valid_lft = ntohl(pinfo->valid);
2642 prefered_lft = ntohl(pinfo->prefered);
2643
2644 if (prefered_lft > valid_lft) {
e87cc472 2645 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2646 return;
2647 }
2648
2649 in6_dev = in6_dev_get(dev);
2650
63159f29 2651 if (!in6_dev) {
e87cc472
JP		 2652 net_dbg_ratelimited("addrconf: device %s not configured\n",
2653 dev->name);
1da177e4
LT		 2654 return;
2655 }
2656
2657 /*
2658 * Two things going on here:
2659 * 1) Add routes for on-link prefixes
2660 * 2) Configure prefixes with the auto flag set
2661 */
2662
4bed72e4 2663 if (pinfo->onlink) {
8d1c802b 2664 struct fib6_info *rt;
4bed72e4
YH		 2665 unsigned long rt_expires;
2666
6f704992
YH		 2667 /* Avoid arithmetic overflow. Really, we could
2668 * save rt_expires in seconds, likely valid_lft,
2669 * but it would require division in fib gc, that it
2670 * not good.
2671 */
4bed72e4
YH		 2672 if (HZ > USER_HZ)
2673 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2674 else
2675 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2676
4bed72e4
YH		 2677 if (addrconf_finite_timeout(rt_expires))
2678 rt_expires *= HZ;
1da177e4 2679
14ef37b6
AH		 2680 rt = addrconf_get_prefix_route(&pinfo->prefix,
2681 pinfo->prefix_len,
2682 dev,
2683 RTF_ADDRCONF | RTF_PREFIX_RT,
2684 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2685
14ef37b6 2686 if (rt) {
6f704992
YH		 2687 /* Autoconf prefix route */
2688 if (valid_lft == 0) {
afb1d4b5 2689 ip6_del_rt(net, rt);
6f704992 2690 rt = NULL;
4bed72e4 2691 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2692 /* not infinity */
14895687 2693 fib6_set_expires(rt, jiffies + rt_expires);
6f704992 2694 } else {
14895687 2695 fib6_clean_expires(rt);
1da177e4
LT		 2696 }
2697 } else if (valid_lft) {
6f704992 2698 clock_t expires = 0;
4bed72e4
YH		 2699 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2700 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2701 /* not infinity */
2702 flags |= RTF_EXPIRES;
2703 expires = jiffies_to_clock_t(rt_expires);
2704 }
1da177e4 2705 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
8308f3ff
DA		 2706 0, dev, expires, flags,
2707 GFP_ATOMIC);
1da177e4 2708 }
93531c67 2709 fib6_info_release(rt);
1da177e4
LT		 2710 }
2711
2712 /* Try to figure out our local address for this prefix */
2713
2714 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1da177e4 2715 struct in6_addr addr;
f997c55c 2716 bool tokenized = false, dev_addr_generated = false;
1da177e4
LT		 2717
2718 if (pinfo->prefix_len == 64) {
2719 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2720
2721 if (!ipv6_addr_any(&in6_dev->token)) {
2722 read_lock_bh(&in6_dev->lock);
2723 memcpy(addr.s6_addr + 8,
2724 in6_dev->token.s6_addr + 8, 8);
2725 read_unlock_bh(&in6_dev->lock);
617fe29d 2726 tokenized = true;
cc9da6cc 2727 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2728 !ipv6_generate_stable_address(&addr, 0,
2729 in6_dev)) {
64236f3f 2730 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2731 goto ok;
f53adae4
DB		 2732 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2733 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
4f672235 2734 goto put;
f997c55c
AA		 2735 } else {
2736 dev_addr_generated = true;
1da177e4
LT		 2737 }
2738 goto ok;
2739 }
e87cc472
JP		 2740 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2741 pinfo->prefix_len);
4f672235 2742 goto put;
1da177e4
LT		 2743
2744ok:
4f672235
AA		 2745 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2746 &addr, addr_type,
2747 addr_flags, sllao,
2748 tokenized, valid_lft,
2749 prefered_lft);
2750 if (err)
2751 goto put;
f997c55c
AA		 2752
2753 /* Ignore error case here because previous prefix add addr was
2754 * successful which will be notified.
2755 */
2756 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2757 addr_type, addr_flags, sllao,
2758 tokenized, valid_lft,
2759 prefered_lft,
2760 dev_addr_generated);
1da177e4
LT		 2761 }
2762 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
4f672235 2763put:
1da177e4
LT		 2764 in6_dev_put(in6_dev);
2765}
2766
2767/*
2768 * Set destination address.
2769 * Special case for SIT interfaces where we create a new "virtual"
2770 * device.
2771 */
af284937 2772int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2773{
2774 struct in6_ifreq ireq;
2775 struct net_device *dev;
2776 int err = -EINVAL;
2777
2778 rtnl_lock();
2779
2780 err = -EFAULT;
2781 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2782 goto err_exit;
2783
af284937 2784 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2785
2786 err = -ENODEV;
63159f29 2787 if (!dev)
1da177e4
LT		 2788 goto err_exit;
2789
07a93626 2790#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2791 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2792 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2793 struct ifreq ifr;
1da177e4
LT		 2794 struct ip_tunnel_parm p;
2795
2796 err = -EADDRNOTAVAIL;
2797 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2798 goto err_exit;
2799
2800 memset(&p, 0, sizeof(p));
2801 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2802 p.iph.saddr = 0;
2803 p.iph.version = 4;
2804 p.iph.ihl = 5;
2805 p.iph.protocol = IPPROTO_IPV6;
2806 p.iph.ttl = 64;
d20b3109 2807 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2808
5bc3eb7e
SH		 2809 if (ops->ndo_do_ioctl) {
2810 mm_segment_t oldfs = get_fs();
2811
2812 set_fs(KERNEL_DS);
2813 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2814 set_fs(oldfs);
2815 } else
2816 err = -EOPNOTSUPP;
1da177e4
LT		 2817
2818 if (err == 0) {
2819 err = -ENOBUFS;
af284937
DL		 2820 dev = __dev_get_by_name(net, p.name);
2821 if (!dev)
1da177e4
LT		 2822 goto err_exit;
2823 err = dev_open(dev);
2824 }
2825 }
0be669bb 2826#endif
1da177e4
LT		 2827
2828err_exit:
2829 rtnl_unlock();
2830 return err;
2831}
2832
93a714d6
MC		 2833static int ipv6_mc_config(struct sock *sk, bool join,
2834 const struct in6_addr *addr, int ifindex)
2835{
2836 int ret;
2837
2838 ASSERT_RTNL();
2839
2840 lock_sock(sk);
2841 if (join)
54ff9ef3 2842 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2843 else
54ff9ef3 2844 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2845 release_sock(sk);
2846
2847 return ret;
2848}
2849
1da177e4
LT		 2850/*
2851 * Manual configuration of address on an interface
2852 */
479840ff 2853static int inet6_addr_add(struct net *net, int ifindex,
19b1518c 2854 struct ifa6_config *cfg,
de95e047 2855 struct netlink_ext_ack *extack)
1da177e4
LT		 2856{
2857 struct inet6_ifaddr *ifp;
2858 struct inet6_dev *idev;
2859 struct net_device *dev;
93a714d6
MC		 2860 unsigned long timeout;
2861 clock_t expires;
6f704992 2862 u32 flags;
1da177e4
LT		 2863
2864 ASSERT_RTNL();
1ab1457c 2865
19b1518c 2866 if (cfg->plen > 128)
24ef0da7
TG		 2867 return -EINVAL;
2868
0778769d 2869 /* check the lifetime */
19b1518c 2870 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
0778769d
NT		 2871 return -EINVAL;
2872
19b1518c 2873 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
53bd6749
JP		 2874 return -EINVAL;
2875
af284937
DL		 2876 dev = __dev_get_by_index(net, ifindex);
2877 if (!dev)
1da177e4 2878 return -ENODEV;
1ab1457c 2879
64e724f6
BH		 2880 idev = addrconf_add_dev(dev);
2881 if (IS_ERR(idev))
2882 return PTR_ERR(idev);
1da177e4 2883
19b1518c 2884 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
93a714d6 2885 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
19b1518c 2886 true, cfg->pfx, ifindex);
93a714d6
MC		 2887
2888 if (ret < 0)
2889 return ret;
2890 }
2891
19b1518c 2892 cfg->scope = ipv6_addr_scope(cfg->pfx);
1da177e4 2893
19b1518c 2894 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4bed72e4
YH		 2895 if (addrconf_finite_timeout(timeout)) {
2896 expires = jiffies_to_clock_t(timeout * HZ);
19b1518c 2897 cfg->valid_lft = timeout;
6f704992 2898 flags = RTF_EXPIRES;
4bed72e4
YH		 2899 } else {
2900 expires = 0;
2901 flags = 0;
19b1518c 2902 cfg->ifa_flags |= IFA_F_PERMANENT;
6f704992 2903 }
0778769d 2904
19b1518c 2905 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4bed72e4
YH		 2906 if (addrconf_finite_timeout(timeout)) {
2907 if (timeout == 0)
19b1518c
DA		 2908 cfg->ifa_flags |= IFA_F_DEPRECATED;
2909 cfg->preferred_lft = timeout;
4bed72e4 2910 }
0778769d 2911
19b1518c 2912 ifp = ipv6_add_addr(idev, cfg, true, extack);
1da177e4 2913 if (!IS_ERR(ifp)) {
19b1518c 2914 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
8308f3ff
DA		 2915 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2916 ifp->rt_priority, dev, expires,
2917 flags, GFP_KERNEL);
761aac73
TH		 2918 }
2919
a2d481b3
LB		 2920 /* Send a netlink notification if DAD is enabled and
2921 * optimistic flag is not set
2922 */
2923 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2924 ipv6_ifa_notify(0, ifp);
95c385b4
NH		 2925 /*
2926 * Note that section 3.1 of RFC 4429 indicates
2927 * that the Optimistic flag should not be set for
2928 * manually configured addresses
2929 */
cf22f9a2 2930 addrconf_dad_start(ifp);
19b1518c
DA		 2931 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2932 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2933 cfg->preferred_lft, true, jiffies);
1da177e4 2934 in6_ifa_put(ifp);
c15b1cca 2935 addrconf_verify_rtnl();
1da177e4 2936 return 0;
19b1518c
DA		 2937 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2938 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
2939 cfg->pfx, ifindex);
1da177e4
LT		 2940 }
2941
2942 return PTR_ERR(ifp);
2943}
2944
6046d5b4
HK		 2945static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2946 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2947{
2948 struct inet6_ifaddr *ifp;
2949 struct inet6_dev *idev;
2950 struct net_device *dev;
1ab1457c 2951
24ef0da7
TG		 2952 if (plen > 128)
2953 return -EINVAL;
2954
af284937
DL		 2955 dev = __dev_get_by_index(net, ifindex);
2956 if (!dev)
1da177e4
LT		 2957 return -ENODEV;
2958
e5d08d71 2959 idev = __in6_dev_get(dev);
63159f29 2960 if (!idev)
1da177e4
LT		 2961 return -ENXIO;
2962
2963 read_lock_bh(&idev->lock);
502a2ffd 2964 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2965 if (ifp->prefix_len == plen &&
2966 ipv6_addr_equal(pfx, &ifp->addr)) {
2967 in6_ifa_hold(ifp);
2968 read_unlock_bh(&idev->lock);
1ab1457c 2969
6046d5b4
HK		 2970 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2971 (ifa_flags & IFA_F_MANAGETEMPADDR))
2972 manage_tempaddrs(idev, ifp, 0, 0, false,
2973 jiffies);
1da177e4 2974 ipv6_del_addr(ifp);
6046d5b4 2975 addrconf_verify_rtnl();
93a714d6
MC		 2976 if (ipv6_addr_is_multicast(pfx)) {
2977 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2978 false, pfx, dev->ifindex);
2979 }
1da177e4
LT		 2980 return 0;
2981 }
2982 }
2983 read_unlock_bh(&idev->lock);
2984 return -EADDRNOTAVAIL;
2985}
2986
2987
af284937 2988int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4 2989{
19b1518c
DA		 2990 struct ifa6_config cfg = {
2991 .ifa_flags = IFA_F_PERMANENT,
2992 .preferred_lft = INFINITY_LIFE_TIME,
2993 .valid_lft = INFINITY_LIFE_TIME,
2994 };
1da177e4
LT		 2995 struct in6_ifreq ireq;
2996 int err;
1ab1457c 2997
af31f412 2998 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2999 return -EPERM;
1ab1457c 3000
1da177e4
LT		 3001 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3002 return -EFAULT;
3003
19b1518c
DA		 3004 cfg.pfx = &ireq.ifr6_addr;
3005 cfg.plen = ireq.ifr6_prefixlen;
3006
1da177e4 3007 rtnl_lock();
19b1518c 3008 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
1da177e4
LT		 3009 rtnl_unlock();
3010 return err;
3011}
3012
af284937 3013int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 3014{
3015 struct in6_ifreq ireq;
3016 int err;
1ab1457c 3017
af31f412 3018 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 3019 return -EPERM;
3020
3021 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3022 return -EFAULT;
3023
3024 rtnl_lock();
6046d5b4 3025 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 3026 ireq.ifr6_prefixlen);
1da177e4
LT		 3027 rtnl_unlock();
3028 return err;
3029}
3030
b5f348e5
IJ		 3031static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3032 int plen, int scope)
3033{
3034 struct inet6_ifaddr *ifp;
e6464b8c
DA		 3035 struct ifa6_config cfg = {
3036 .pfx = addr,
3037 .plen = plen,
3038 .ifa_flags = IFA_F_PERMANENT,
3039 .valid_lft = INFINITY_LIFE_TIME,
3040 .preferred_lft = INFINITY_LIFE_TIME,
3041 .scope = scope
3042 };
b5f348e5 3043
e6464b8c 3044 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
b5f348e5
IJ		 3045 if (!IS_ERR(ifp)) {
3046 spin_lock_bh(&ifp->lock);
3047 ifp->flags &= ~IFA_F_TENTATIVE;
3048 spin_unlock_bh(&ifp->lock);
764d3be6 3049 rt_genid_bump_ipv6(dev_net(idev->dev));
b5f348e5
IJ		 3050 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3051 in6_ifa_put(ifp);
3052 }
3053}
3054
07a93626 3055#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3056static void sit_add_v4_addrs(struct inet6_dev *idev)
3057{
1da177e4
LT		 3058 struct in6_addr addr;
3059 struct net_device *dev;
c346dca1 3060 struct net *net = dev_net(idev->dev);
929c9cf3 3061 int scope, plen;
f0e2acfa 3062 u32 pflags = 0;
1da177e4
LT		 3063
3064 ASSERT_RTNL();
3065
3066 memset(&addr, 0, sizeof(struct in6_addr));
3067 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3068
3069 if (idev->dev->flags&IFF_POINTOPOINT) {
3070 addr.s6_addr32[0] = htonl(0xfe800000);
3071 scope = IFA_LINK;
929c9cf3 3072 plen = 64;
1da177e4
LT		 3073 } else {
3074 scope = IPV6_ADDR_COMPATv4;
929c9cf3 3075 plen = 96;
f0e2acfa 3076 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 3077 }
3078
3079 if (addr.s6_addr32[3]) {
929c9cf3 3080 add_addr(idev, &addr, plen, scope);
8308f3ff 3081 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
e500c6d3 3082 GFP_KERNEL);
1da177e4
LT		 3083 return;
3084 }
3085
6fda7350 3086 for_each_netdev(net, dev) {
8e5e8f30 3087 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 3088 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 3089 struct in_ifaddr *ifa;
1da177e4
LT		 3090
3091 int flag = scope;
3092
3093 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 3094
3095 addr.s6_addr32[3] = ifa->ifa_local;
3096
3097 if (ifa->ifa_scope == RT_SCOPE_LINK)
3098 continue;
3099 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3100 if (idev->dev->flags&IFF_POINTOPOINT)
3101 continue;
3102 flag |= IFA_HOST;
3103 }
1da177e4 3104
b5f348e5 3105 add_addr(idev, &addr, plen, flag);
8308f3ff 3106 addrconf_prefix_route(&addr, plen, 0, idev->dev,
e500c6d3 3107 0, pflags, GFP_KERNEL);
1da177e4
LT		 3108 }
3109 }
1ab1457c 3110 }
1da177e4 3111}
0be669bb 3112#endif
1da177e4
LT		 3113
3114static void init_loopback(struct net_device *dev)
3115{
3116 struct inet6_dev *idev;
1da177e4
LT		 3117
3118 /* ::1 */
3119
3120 ASSERT_RTNL();
3121
e5d08d71 3122 idev = ipv6_find_idev(dev);
63159f29 3123 if (!idev) {
91df42be 3124 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3125 return;
3126 }
3127
b5f348e5 3128 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 3129}
3130
2ad3ed59
AA		 3131void addrconf_add_linklocal(struct inet6_dev *idev,
3132 const struct in6_addr *addr, u32 flags)
1da177e4 3133{
e6464b8c
DA		 3134 struct ifa6_config cfg = {
3135 .pfx = addr,
3136 .plen = 64,
3137 .ifa_flags = flags | IFA_F_PERMANENT,
3138 .valid_lft = INFINITY_LIFE_TIME,
3139 .preferred_lft = INFINITY_LIFE_TIME,
3140 .scope = IFA_LINK
3141 };
8e5e8f30 3142 struct inet6_ifaddr *ifp;
95c385b4
NH		 3143
3144#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 3145 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3146 idev->cnf.optimistic_dad) &&
702beb87 3147 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
e6464b8c 3148 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
95c385b4 3149#endif
1da177e4 3150
e6464b8c 3151 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
1da177e4 3152 if (!IS_ERR(ifp)) {
8308f3ff 3153 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
acb54e3c 3154 0, 0, GFP_ATOMIC);
cf22f9a2 3155 addrconf_dad_start(ifp);
1da177e4
LT		 3156 in6_ifa_put(ifp);
3157 }
3158}
2ad3ed59 3159EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
1da177e4 3160
622c81d5
HFS		 3161static bool ipv6_reserved_interfaceid(struct in6_addr address)
3162{
3163 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3164 return true;
3165
3166 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3167 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3168 return true;
3169
3170 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3171 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3172 return true;
3173
3174 return false;
3175}
3176
3177static int ipv6_generate_stable_address(struct in6_addr *address,
3178 u8 dad_count,
3179 const struct inet6_dev *idev)
3180{
622c81d5
HFS		 3181 static DEFINE_SPINLOCK(lock);
3182 static __u32 digest[SHA_DIGEST_WORDS];
3183 static __u32 workspace[SHA_WORKSPACE_WORDS];
3184
3185 static union {
3186 char __data[SHA_MESSAGE_BYTES];
3187 struct {
3188 struct in6_addr secret;
ff40217e 3189 __be32 prefix[2];
622c81d5
HFS		 3190 unsigned char hwaddr[MAX_ADDR_LEN];
3191 u8 dad_count;
3192 } __packed;
3193 } data;
3194
3195 struct in6_addr secret;
3196 struct in6_addr temp;
3197 struct net *net = dev_net(idev->dev);
3198
3199 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3200
3201 if (idev->cnf.stable_secret.initialized)
3202 secret = idev->cnf.stable_secret.secret;
3203 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3204 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3205 else
3206 return -1;
3207
3208retry:
3209 spin_lock_bh(&lock);
3210
3211 sha_init(digest);
3212 memset(&data, 0, sizeof(data));
3213 memset(workspace, 0, sizeof(workspace));
3214 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3215 data.prefix[0] = address->s6_addr32[0];
3216 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3217 data.secret = secret;
3218 data.dad_count = dad_count;
3219
3220 sha_transform(digest, data.__data, workspace);
3221
3222 temp = *address;
ff40217e
HFS		 3223 temp.s6_addr32[2] = (__force __be32)digest[0];
3224 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3225
3226 spin_unlock_bh(&lock);
3227
3228 if (ipv6_reserved_interfaceid(temp)) {
3229 dad_count++;
1855b7c3 3230 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3231 return -1;
3232 goto retry;
3233 }
3234
3235 *address = temp;
3236 return 0;
3237}
3238
cc9da6cc
BM		 3239static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3240{
3241 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3242
3243 if (s->initialized)
3244 return;
3245 s = &idev->cnf.stable_secret;
3246 get_random_bytes(&s->secret, sizeof(s->secret));
3247 s->initialized = true;
3248}
3249
bc91b0f0
JP		 3250static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3251{
622c81d5
HFS		 3252 struct in6_addr addr;
3253
ca254490
DA		 3254 /* no link local addresses on L3 master devices */
3255 if (netif_is_l3_master(idev->dev))
3256 return;
3257
622c81d5 3258 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3259
d35a00b8 3260 switch (idev->cnf.addr_gen_mode) {
cc9da6cc
BM		 3261 case IN6_ADDR_GEN_MODE_RANDOM:
3262 ipv6_gen_mode_random_init(idev);
3263 /* fallthrough */
3264 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3265 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3266 addrconf_add_linklocal(idev, &addr,
3267 IFA_F_STABLE_PRIVACY);
622c81d5 3268 else if (prefix_route)
8308f3ff 3269 addrconf_prefix_route(&addr, 64, 0, idev->dev,
acb54e3c 3270 0, 0, GFP_KERNEL);
cc9da6cc
BM		 3271 break;
3272 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3273 /* addrconf_add_linklocal also adds a prefix_route and we
3274 * only need to care about prefix routes if ipv6_generate_eui64
3275 * couldn't generate one.
3276 */
3277 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3278 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0 3279 else if (prefix_route)
8308f3ff 3280 addrconf_prefix_route(&addr, 64, 0, idev->dev,
27b10608 3281 0, 0, GFP_KERNEL);
cc9da6cc
BM		 3282 break;
3283 case IN6_ADDR_GEN_MODE_NONE:
3284 default:
3285 /* will not add any link local address */
3286 break;
bc91b0f0
JP		 3287 }
3288}
3289
1da177e4
LT		 3290static void addrconf_dev_config(struct net_device *dev)
3291{
8e5e8f30 3292 struct inet6_dev *idev;
1da177e4
LT		 3293
3294 ASSERT_RTNL();
3295
74235a25
HX		 3296 if ((dev->type != ARPHRD_ETHER) &&
3297 (dev->type != ARPHRD_FDDI) &&
74235a25 3298 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3299 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3300 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3301 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc 3302 (dev->type != ARPHRD_6LOWPAN) &&
45ce0fd1
FJ		 3303 (dev->type != ARPHRD_IP6GRE) &&
3304 (dev->type != ARPHRD_IPGRE) &&
3305 (dev->type != ARPHRD_TUNNEL) &&
9deb441c
SAK		 3306 (dev->type != ARPHRD_NONE) &&
3307 (dev->type != ARPHRD_RAWIP)) {
74235a25
HX		 3308 /* Alas, we support only Ethernet autoconfiguration. */
3309 return;
3310 }
3311
1da177e4 3312 idev = addrconf_add_dev(dev);
64e724f6 3313 if (IS_ERR(idev))
1da177e4
LT		 3314 return;
3315
cc9da6cc
BM		 3316 /* this device type has no EUI support */
3317 if (dev->type == ARPHRD_NONE &&
d35a00b8
FJ		 3318 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3319 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc 3320
bc91b0f0 3321 addrconf_addr_gen(idev, false);
1da177e4
LT		 3322}
3323
07a93626 3324#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3325static void addrconf_sit_config(struct net_device *dev)
3326{
3327 struct inet6_dev *idev;
3328
3329 ASSERT_RTNL();
3330
1ab1457c
YH		 3331 /*
3332 * Configure the tunnel with one of our IPv4
3333 * addresses... we should configure all of
1da177e4
LT		 3334 * our v4 addrs in the tunnel
3335 */
3336
e5d08d71 3337 idev = ipv6_find_idev(dev);
63159f29 3338 if (!idev) {
91df42be 3339 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3340 return;
3341 }
3342
c7dc89c0 3343 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3344 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3345 return;
3346 }
3347
1da177e4
LT		 3348 sit_add_v4_addrs(idev);
3349
62b54dd9 3350 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3351 addrconf_add_mroute(dev);
1da177e4 3352}
0be669bb 3353#endif
1da177e4 3354
07a93626 3355#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3356static void addrconf_gre_config(struct net_device *dev)
3357{
3358 struct inet6_dev *idev;
aee80b54 3359
aee80b54 3360 ASSERT_RTNL();
3361
e5d08d71 3362 idev = ipv6_find_idev(dev);
63159f29 3363 if (!idev) {
91df42be 3364 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3365 return;
3366 }
3367
bc91b0f0 3368 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3369 if (dev->flags & IFF_POINTOPOINT)
3370 addrconf_add_mroute(dev);
aee80b54 3371}
3372#endif
3373
afb1d4b5
DA		 3374static int fixup_permanent_addr(struct net *net,
3375 struct inet6_dev *idev,
f1705ec1
DA		 3376 struct inet6_ifaddr *ifp)
3377{
93c2fb25 3378 /* !fib6_node means the host route was removed from the
8048ced9
DA		 3379 * FIB, for example, if 'lo' device is taken down. In that
3380 * case regenerate the host route.
3381 */
93c2fb25 3382 if (!ifp->rt || !ifp->rt->fib6_node) {
360a9887 3383 struct fib6_info *f6i, *prev;
f1705ec1 3384
360a9887
DA		 3385 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3386 GFP_ATOMIC);
3387 if (IS_ERR(f6i))
3388 return PTR_ERR(f6i);
f1705ec1 3389
8048ced9
DA		 3390 /* ifp->rt can be accessed outside of rtnl */
3391 spin_lock(&ifp->lock);
3392 prev = ifp->rt;
360a9887 3393 ifp->rt = f6i;
8048ced9
DA		 3394 spin_unlock(&ifp->lock);
3395
93531c67 3396 fib6_info_release(prev);
f1705ec1
DA		 3397 }
3398
3399 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3400 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
8308f3ff
DA		 3401 ifp->rt_priority, idev->dev, 0, 0,
3402 GFP_ATOMIC);
f1705ec1
DA		 3403 }
3404
6d717134
DA		 3405 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3406 addrconf_dad_start(ifp);
f1705ec1
DA		 3407
3408 return 0;
3409}
3410
afb1d4b5 3411static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
f1705ec1
DA		 3412{
3413 struct inet6_ifaddr *ifp, *tmp;
3414 struct inet6_dev *idev;
3415
3416 idev = __in6_dev_get(dev);
3417 if (!idev)
3418 return;
3419
3420 write_lock_bh(&idev->lock);
3421
3422 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3423 if ((ifp->flags & IFA_F_PERMANENT) &&
afb1d4b5 3424 fixup_permanent_addr(net, idev, ifp) < 0) {
f1705ec1 3425 write_unlock_bh(&idev->lock);
e669b869 3426 in6_ifa_hold(ifp);
f1705ec1
DA		 3427 ipv6_del_addr(ifp);
3428 write_lock_bh(&idev->lock);
3429
3430 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3431 idev->dev->name, &ifp->addr);
3432 }
3433 }
3434
3435 write_unlock_bh(&idev->lock);
3436}
3437
1ab1457c 3438static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3439 void *ptr)
1da177e4 3440{
351638e7 3441 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4f7f34ea 3442 struct netdev_notifier_changeupper_info *info;
748e2d93 3443 struct inet6_dev *idev = __in6_dev_get(dev);
60abc0be 3444 struct net *net = dev_net(dev);
c5e33bdd 3445 int run_pending = 0;
b217d616 3446 int err;
1da177e4 3447
e21e8467 3448 switch (event) {
45ba9dd2 3449 case NETDEV_REGISTER:
74235a25 3450 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3451 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3452 if (IS_ERR(idev))
3453 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3454 }
3455 break;
bcdd553f 3456
b7b0b1d2
AD		 3457 case NETDEV_CHANGEMTU:
3458 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3459 if (dev->mtu < IPV6_MIN_MTU) {
60abc0be 3460 addrconf_ifdown(dev, dev != net->loopback_dev);
b7b0b1d2
AD		 3461 break;
3462 }
3463
3464 if (idev) {
3465 rt6_mtu_change(dev, dev->mtu);
3466 idev->cnf.mtu6 = dev->mtu;
3467 break;
3468 }
3469
3470 /* allocate new idev */
3471 idev = ipv6_add_dev(dev);
3472 if (IS_ERR(idev))
3473 break;
3474
3475 /* device is still not ready */
3476 if (!(idev->if_flags & IF_READY))
3477 break;
3478
3479 run_pending = 1;
3480
3481 /* fall through */
3482
1da177e4 3483 case NETDEV_UP:
3c21edbd 3484 case NETDEV_CHANGE:
c2edacf8
JV		 3485 if (dev->flags & IFF_SLAVE)
3486 break;
3487
3ce62a84
WC		 3488 if (idev && idev->cnf.disable_ipv6)
3489 break;
3490
3c21edbd 3491 if (event == NETDEV_UP) {
38bd10c4 3492 /* restore routes for permanent addresses */
afb1d4b5 3493 addrconf_permanent_addr(net, dev);
38bd10c4 3494
1f372c7b 3495 if (!addrconf_link_ready(dev)) {
3c21edbd 3496 /* device is not ready yet. */
f3213831 3497 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3498 dev->name);
3499 break;
3500 }
99081049 3501
d31c7b8f
EP		 3502 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3503 idev = ipv6_add_dev(dev);
3504
a317a2f1 3505 if (!IS_ERR_OR_NULL(idev)) {
99081049 3506 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3507 run_pending = 1;
3508 }
b7b0b1d2 3509 } else if (event == NETDEV_CHANGE) {
1f372c7b 3510 if (!addrconf_link_ready(dev)) {
3c21edbd 3511 /* device is still not ready. */
27c6fa73 3512 rt6_sync_down_dev(dev, event);
3c21edbd
YH		 3513 break;
3514 }
3515
3516 if (idev) {
a088d1d7
LL		 3517 if (idev->if_flags & IF_READY) {
3518 /* device is already configured -
3519 * but resend MLD reports, we might
3520 * have roamed and need to update
3521 * multicast snooping switches
3522 */
3523 ipv6_mc_up(idev);
27c6fa73 3524 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3c21edbd 3525 break;
a088d1d7 3526 }
3c21edbd
YH		 3527 idev->if_flags |= IF_READY;
3528 }
3529
f3213831
JP		 3530 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3531 dev->name);
3c21edbd 3532
c5e33bdd 3533 run_pending = 1;
3c21edbd
YH		 3534 }
3535
e21e8467 3536 switch (dev->type) {
07a93626 3537#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3538 case ARPHRD_SIT:
3539 addrconf_sit_config(dev);
3540 break;
aee80b54 3541#endif
07a93626 3542#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3543 case ARPHRD_IPGRE:
3544 addrconf_gre_config(dev);
3545 break;
0be669bb 3546#endif
1da177e4
LT		 3547 case ARPHRD_LOOPBACK:
3548 init_loopback(dev);
3549 break;
3550
3551 default:
3552 addrconf_dev_config(dev);
3553 break;
3ff50b79 3554 }
bcdd553f 3555
a317a2f1 3556 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3557 if (run_pending)
3558 addrconf_dad_run(idev);
3559
2127d95a
IS		 3560 /* Device has an address by now */
3561 rt6_sync_up(dev, RTNH_F_DEAD);
3562
bcdd553f
SH		 3563 /*
3564 * If the MTU changed during the interface down,
3565 * when the interface up, the changed MTU must be
3566 * reflected in the idev as well as routers.
1da177e4 3567 */
bcdd553f
SH		 3568 if (idev->cnf.mtu6 != dev->mtu &&
3569 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3570 rt6_mtu_change(dev, dev->mtu);
3571 idev->cnf.mtu6 = dev->mtu;
3572 }
3573 idev->tstamp = jiffies;
3574 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3575
3576 /*
3577 * If the changed mtu during down is lower than
3578 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3579 */
3580 if (dev->mtu < IPV6_MIN_MTU)
60abc0be 3581 addrconf_ifdown(dev, dev != net->loopback_dev);
1da177e4
LT		 3582 }
3583 break;
3584
1da177e4
LT		 3585 case NETDEV_DOWN:
3586 case NETDEV_UNREGISTER:
3587 /*
3588 * Remove all addresses from this interface.
3589 */
3590 addrconf_ifdown(dev, event != NETDEV_DOWN);
3591 break;
3c21edbd 3592
1da177e4 3593 case NETDEV_CHANGENAME:
1da177e4 3594 if (idev) {
5632c515 3595 snmp6_unregister_dev(idev);
408c4768 3596 addrconf_sysctl_unregister(idev);
a317a2f1 3597 err = addrconf_sysctl_register(idev);
b217d616
HX		 3598 if (err)
3599 return notifier_from_errno(err);
a317a2f1
WC		 3600 err = snmp6_register_dev(idev);
3601 if (err) {
3602 addrconf_sysctl_unregister(idev);
3603 return notifier_from_errno(err);
3604 }
5632c515 3605 }
1da177e4 3606 break;
bcdd553f 3607
93d9b7d7
JP		 3608 case NETDEV_PRE_TYPE_CHANGE:
3609 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3610 if (idev)
3611 addrconf_type_change(dev, event);
75c78500 3612 break;
4f7f34ea
DA		 3613
3614 case NETDEV_CHANGEUPPER:
3615 info = ptr;
3616
3617 /* flush all routes if dev is linked to or unlinked from
3618 * an L3 master device (e.g., VRF)
3619 */
3620 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3621 addrconf_ifdown(dev, 0);
3ff50b79 3622 }
1da177e4
LT		 3623
3624 return NOTIFY_OK;
3625}
3626
3627/*
3628 * addrconf module should be notified of a device going up
3629 */
3630static struct notifier_block ipv6_dev_notf = {
3631 .notifier_call = addrconf_notify,
242d3a49 3632 .priority = ADDRCONF_NOTIFY_PRIORITY,
1da177e4
LT		 3633};
3634
93d9b7d7 3635static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3636{
3637 struct inet6_dev *idev;
3638 ASSERT_RTNL();
3639
3640 idev = __in6_dev_get(dev);
3641
93d9b7d7 3642 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3643 ipv6_mc_remap(idev);
93d9b7d7 3644 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3645 ipv6_mc_unmap(idev);
3646}
3647
70af921d
DA		 3648static bool addr_is_local(const struct in6_addr *addr)
3649{
3650 return ipv6_addr_type(addr) &
3651 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3652}
3653
1da177e4
LT		 3654static int addrconf_ifdown(struct net_device *dev, int how)
3655{
4c981e28 3656 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN;
c346dca1 3657 struct net *net = dev_net(dev);
502a2ffd 3658 struct inet6_dev *idev;
f1705ec1 3659 struct inet6_ifaddr *ifa, *tmp;
0aef78aa 3660 bool keep_addr = false;
73a8bd74 3661 int state, i;
1da177e4
LT		 3662
3663 ASSERT_RTNL();
3664
4c981e28 3665 rt6_disable_ip(dev, event);
1da177e4
LT		 3666
3667 idev = __in6_dev_get(dev);
63159f29 3668 if (!idev)
1da177e4
LT		 3669 return -ENODEV;
3670
bcdd553f
SH		 3671 /*
3672 * Step 1: remove reference to ipv6 device from parent device.
3673 * Do not dev_put!
1da177e4 3674 */
439e2385 3675 if (how) {
1da177e4 3676 idev->dead = 1;
8814c4b5
YH		 3677
3678 /* protected by rtnl_lock */
a9b3cd7f 3679 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3680
3681 /* Step 1.5: remove snmp6 entry */
3682 snmp6_unregister_dev(idev);
3683
3684 }
3685
f1705ec1
DA		 3686 /* combine the user config with event to determine if permanent
3687 * addresses are to be removed from address hash table
3688 */
0aef78aa
IV		 3689 if (!how && !idev->cnf.disable_ipv6) {
3690 /* aggregate the system setting and interface setting */
3691 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3692
3693 if (!_keep_addr)
3694 _keep_addr = idev->cnf.keep_addr_on_down;
3695
3696 keep_addr = (_keep_addr > 0);
3697 }
f1705ec1 3698
73a8bd74
DM		 3699 /* Step 2: clear hash table */
3700 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3701 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3702
3703 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3704restart:
b67bfe0d 3705 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3706 if (ifa->idev == idev) {
c15b1cca 3707 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3708 /* combined flag + permanent flag decide if
3709 * address is retained on a down event
3710 */
3711 if (!keep_addr ||
70af921d
DA		 3712 !(ifa->flags & IFA_F_PERMANENT) ||
3713 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3714 hlist_del_init_rcu(&ifa->addr_lst);
3715 goto restart;
3716 }
73a8bd74
DM		 3717 }
3718 }
3719 spin_unlock_bh(&addrconf_hash_lock);
3720 }
3721
1da177e4
LT		 3722 write_lock_bh(&idev->lock);
3723
b7b1bfce
HFS		 3724 addrconf_del_rs_timer(idev);
3725
bcdd553f 3726 /* Step 2: clear flags for stateless addrconf */
439e2385 3727 if (!how)
3c21edbd 3728 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3729
bcdd553f 3730 /* Step 3: clear tempaddr list */
372e6c8f 3731 while (!list_empty(&idev->tempaddr_list)) {
3732 ifa = list_first_entry(&idev->tempaddr_list,
3733 struct inet6_ifaddr, tmp_list);
3734 list_del(&ifa->tmp_list);
1da177e4
LT		 3735 write_unlock_bh(&idev->lock);
3736 spin_lock_bh(&ifa->lock);
3737
3738 if (ifa->ifpub) {
3739 in6_ifa_put(ifa->ifpub);
3740 ifa->ifpub = NULL;
3741 }
3742 spin_unlock_bh(&ifa->lock);
3743 in6_ifa_put(ifa);
3744 write_lock_bh(&idev->lock);
3745 }
8f37ada5 3746
f1705ec1 3747 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
8d1c802b 3748 struct fib6_info *rt = NULL;
a2d6cbb0 3749 bool keep;
38bd10c4 3750
f1705ec1 3751 addrconf_del_dad_work(ifa);
84e8b803 3752
a2d6cbb0
RV		 3753 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3754 !addr_is_local(&ifa->addr);
a2d6cbb0 3755
73a8bd74 3756 write_unlock_bh(&idev->lock);
8e8e676d 3757 spin_lock_bh(&ifa->lock);
f1705ec1 3758
a2d6cbb0 3759 if (keep) {
f1705ec1
DA		 3760 /* set state to skip the notifier below */
3761 state = INET6_IFADDR_STATE_DEAD;
6d717134 3762 ifa->state = INET6_IFADDR_STATE_PREDAD;
f1705ec1
DA		 3763 if (!(ifa->flags & IFA_F_NODAD))
3764 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3765
3766 rt = ifa->rt;
3767 ifa->rt = NULL;
f1705ec1
DA		 3768 } else {
3769 state = ifa->state;
3770 ifa->state = INET6_IFADDR_STATE_DEAD;
f1705ec1
DA		 3771 }
3772
8e8e676d 3773 spin_unlock_bh(&ifa->lock);
9d82ca98 3774
38bd10c4 3775 if (rt)
afb1d4b5 3776 ip6_del_rt(net, rt);
38bd10c4 3777
73a8bd74
DM		 3778 if (state != INET6_IFADDR_STATE_DEAD) {
3779 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3780 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
ea06f717
MM		 3781 } else {
3782 if (idev->cnf.forwarding)
3783 addrconf_leave_anycast(ifa);
3784 addrconf_leave_solict(ifa->idev, &ifa->addr);
27bdb2ab 3785 }
8f37ada5 3786
73a8bd74 3787 write_lock_bh(&idev->lock);
8ef802aa
ED		 3788 if (!keep) {
3789 list_del_rcu(&ifa->if_list);
3790 in6_ifa_put(ifa);
3791 }
73a8bd74 3792 }
8f37ada5 3793
1da177e4
LT		 3794 write_unlock_bh(&idev->lock);
3795
381f4dca
SD		 3796 /* Step 5: Discard anycast and multicast list */
3797 if (how) {
3798 ipv6_ac_destroy_dev(idev);
1da177e4 3799 ipv6_mc_destroy_dev(idev);
381f4dca 3800 } else {
1da177e4 3801 ipv6_mc_down(idev);
381f4dca 3802 }
1da177e4 3803
1da177e4 3804 idev->tstamp = jiffies;
1ab1457c 3805
bcdd553f 3806 /* Last: Shot the device (if unregistered) */
439e2385 3807 if (how) {
408c4768 3808 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3809 neigh_parms_release(&nd_tbl, idev->nd_parms);
3810 neigh_ifdown(&nd_tbl, dev);
3811 in6_dev_put(idev);
3812 }
3813 return 0;
3814}
3815
e99e88a9 3816static void addrconf_rs_timer(struct timer_list *t)
1da177e4 3817{
e99e88a9 3818 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
caf92bc4 3819 struct net_device *dev = idev->dev;
b7b1bfce 3820 struct in6_addr lladdr;
1da177e4 3821
b7b1bfce 3822 write_lock(&idev->lock);
5b2a1953 3823 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3824 goto out;
3825
9ba2add3 3826 if (!ipv6_accept_ra(idev))
5b2a1953 3827 goto out;
3828
3829 /* Announcement received after solicitation was sent */
3830 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3831 goto out;
1da177e4 3832
bd11f074 3833 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
caf92bc4
CW		 3834 write_unlock(&idev->lock);
3835 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3836 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3837 &in6addr_linklocal_allrouters);
3838 else
caf92bc4 3839 goto put;
1da177e4 3840
caf92bc4 3841 write_lock(&idev->lock);
bd11f074
MŻ		 3842 idev->rs_interval = rfc3315_s14_backoff_update(
3843 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
b7b1bfce
HFS		 3844 /* The wait after the last probe can be shorter */
3845 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3846 idev->cnf.rtr_solicits) ?
3847 idev->cnf.rtr_solicit_delay :
bd11f074 3848 idev->rs_interval);
1da177e4 3849 } else {
1da177e4
LT		 3850 /*
3851 * Note: we do not support deprecated "all on-link"
3852 * assumption any longer.
3853 */
91df42be 3854 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3855 }
3856
3857out:
b7b1bfce 3858 write_unlock(&idev->lock);
caf92bc4 3859put:
b7b1bfce 3860 in6_dev_put(idev);
1da177e4
LT		 3861}
3862
3863/*
3864 * Duplicate Address Detection
3865 */
3c21edbd
YH		 3866static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3867{
3868 unsigned long rand_num;
3869 struct inet6_dev *idev = ifp->idev;
adc176c5 3870 u64 nonce;
3c21edbd 3871
95c385b4
NH		 3872 if (ifp->flags & IFA_F_OPTIMISTIC)
3873 rand_num = 0;
3874 else
63862b5b 3875 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3876
adc176c5
EN		 3877 nonce = 0;
3878 if (idev->cnf.enhanced_dad ||
3879 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3880 do
3881 get_random_bytes(&nonce, 6);
3882 while (nonce == 0);
3883 }
3884 ifp->dad_nonce = nonce;
b7b1bfce 3885 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3886 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3887}
3888
c15b1cca 3889static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3890{
3891 struct inet6_dev *idev = ifp->idev;
3892 struct net_device *dev = idev->dev;
764d3be6 3893 bool bump_id, notify = false;
afb1d4b5 3894 struct net *net;
1da177e4
LT		 3895
3896 addrconf_join_solict(dev, &ifp->addr);
3897
63862b5b 3898 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3899
3900 read_lock_bh(&idev->lock);
622ccdf1 3901 spin_lock(&ifp->lock);
e9d3e084 3902 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3903 goto out;
1da177e4 3904
afb1d4b5 3905 net = dev_net(dev);
1da177e4 3906 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
afb1d4b5 3907 (net->ipv6.devconf_all->accept_dad < 1 &&
a2d3f3e3 3908 idev->cnf.accept_dad < 1) ||
55ebaef1
NT		 3909 !(ifp->flags&IFA_F_TENTATIVE) ||
3910 ifp->flags & IFA_F_NODAD) {
c76fe2d9
DA		 3911 bool send_na = false;
3912
3913 if (ifp->flags & IFA_F_TENTATIVE &&
3914 !(ifp->flags & IFA_F_OPTIMISTIC))
3915 send_na = true;
764d3be6 3916 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3917 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3918 spin_unlock(&ifp->lock);
1da177e4
LT		 3919 read_unlock_bh(&idev->lock);
3920
c76fe2d9 3921 addrconf_dad_completed(ifp, bump_id, send_na);
1da177e4
LT		 3922 return;
3923 }
3924
6732bade 3925 if (!(idev->if_flags & IF_READY)) {
21809faf 3926 spin_unlock(&ifp->lock);
6732bade 3927 read_unlock_bh(&idev->lock);
3c21edbd 3928 /*
590a9887 3929 * If the device is not ready:
3c21edbd
YH		 3930 * - keep it tentative if it is a permanent address.
3931 * - otherwise, kill it.
3932 */
3933 in6_ifa_hold(ifp);
cc411d0b 3934 addrconf_dad_stop(ifp, 0);
6732bade 3935 return;
3c21edbd 3936 }
95c385b4
NH		 3937
3938 /*
3939 * Optimistic nodes can start receiving
3940 * Frames right away
3941 */
7fd2561e 3942 if (ifp->flags & IFA_F_OPTIMISTIC) {
afb1d4b5
DA		 3943 ip6_ins_rt(net, ifp->rt);
3944 if (ipv6_use_optimistic_addr(net, idev)) {
7fd2561e
EK		 3945 /* Because optimistic nodes can use this address,
3946 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3947 */
16186a82 3948 notify = true;
7fd2561e
EK		 3949 }
3950 }
95c385b4 3951
6732bade 3952 addrconf_dad_kick(ifp);
1da177e4 3953out:
622ccdf1 3954 spin_unlock(&ifp->lock);
1da177e4 3955 read_unlock_bh(&idev->lock);
16186a82 3956 if (notify)
3957 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 3958}
3959
c15b1cca 3960static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3961{
c15b1cca
HFS		 3962 bool begin_dad = false;
3963
8e8e676d 3964 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3965 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3966 ifp->state = INET6_IFADDR_STATE_PREDAD;
3967 begin_dad = true;
3968 }
8e8e676d 3969 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3970
3971 if (begin_dad)
3972 addrconf_mod_dad_work(ifp, 0);
3973}
3974
3975static void addrconf_dad_work(struct work_struct *w)
3976{
3977 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3978 struct inet6_ifaddr,
3979 dad_work);
1da177e4 3980 struct inet6_dev *idev = ifp->idev;
764d3be6 3981 bool bump_id, disable_ipv6 = false;
1da177e4
LT		 3982 struct in6_addr mcaddr;
3983
c15b1cca
HFS		 3984 enum {
3985 DAD_PROCESS,
3986 DAD_BEGIN,
3987 DAD_ABORT,
3988 } action = DAD_PROCESS;
3989
3990 rtnl_lock();
3991
8e8e676d 3992 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3993 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3994 action = DAD_BEGIN;
3995 ifp->state = INET6_IFADDR_STATE_DAD;
3996 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3997 action = DAD_ABORT;
3998 ifp->state = INET6_IFADDR_STATE_POSTDAD;
85b51b12 3999
35e015e1
MC		 4000 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4001 idev->cnf.accept_dad > 1) &&
4002 !idev->cnf.disable_ipv6 &&
85b51b12
MM		 4003 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4004 struct in6_addr addr;
4005
4006 addr.s6_addr32[0] = htonl(0xfe800000);
4007 addr.s6_addr32[1] = 0;
4008
4009 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4010 ipv6_addr_equal(&ifp->addr, &addr)) {
4011 /* DAD failed for link-local based on MAC */
4012 idev->cnf.disable_ipv6 = 1;
4013
4014 pr_info("%s: IPv6 being disabled!\n",
4015 ifp->idev->dev->name);
4016 disable_ipv6 = true;
4017 }
4018 }
c15b1cca 4019 }
8e8e676d 4020 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 4021
4022 if (action == DAD_BEGIN) {
4023 addrconf_dad_begin(ifp);
4024 goto out;
4025 } else if (action == DAD_ABORT) {
751eb6b6 4026 in6_ifa_hold(ifp);
c15b1cca 4027 addrconf_dad_stop(ifp, 1);
85b51b12
MM		 4028 if (disable_ipv6)
4029 addrconf_ifdown(idev->dev, 0);
c15b1cca
HFS		 4030 goto out;
4031 }
4032
b7b1bfce 4033 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 4034 goto out;
4035
c15b1cca 4036 write_lock_bh(&idev->lock);
122e4519 4037 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 4038 write_unlock_bh(&idev->lock);
1da177e4
LT		 4039 goto out;
4040 }
21809faf 4041
4042 spin_lock(&ifp->lock);
622ccdf1
HX		 4043 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4044 spin_unlock(&ifp->lock);
c15b1cca 4045 write_unlock_bh(&idev->lock);
622ccdf1
HX		 4046 goto out;
4047 }
4048
b7b1bfce 4049 if (ifp->dad_probes == 0) {
c76fe2d9
DA		 4050 bool send_na = false;
4051
1da177e4
LT		 4052 /*
4053 * DAD was successful
4054 */
4055
c76fe2d9
DA		 4056 if (ifp->flags & IFA_F_TENTATIVE &&
4057 !(ifp->flags & IFA_F_OPTIMISTIC))
4058 send_na = true;
764d3be6 4059 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 4060 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 4061 spin_unlock(&ifp->lock);
c15b1cca 4062 write_unlock_bh(&idev->lock);
1da177e4 4063
c76fe2d9 4064 addrconf_dad_completed(ifp, bump_id, send_na);
1da177e4
LT		 4065
4066 goto out;
4067 }
4068
b7b1bfce 4069 ifp->dad_probes--;
c15b1cca
HFS		 4070 addrconf_mod_dad_work(ifp,
4071 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 4072 spin_unlock(&ifp->lock);
c15b1cca 4073 write_unlock_bh(&idev->lock);
1da177e4
LT		 4074
4075 /* send a neighbour solicitation for our addr */
1da177e4 4076 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
adc176c5
EN		 4077 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4078 ifp->dad_nonce);
1da177e4
LT		 4079out:
4080 in6_ifa_put(ifp);
c15b1cca 4081 rtnl_unlock();
1da177e4
LT		 4082}
4083
11ffff75
HFS		 4084/* ifp->idev must be at least read locked */
4085static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4086{
4087 struct inet6_ifaddr *ifpiter;
4088 struct inet6_dev *idev = ifp->idev;
4089
602582ca
HFS		 4090 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4091 if (ifpiter->scope > IFA_LINK)
4092 break;
11ffff75
HFS		 4093 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4094 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4095 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4096 IFA_F_PERMANENT)
4097 return false;
4098 }
4099 return true;
4100}
4101
c76fe2d9
DA		 4102static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4103 bool send_na)
1da177e4 4104{
e21e8467 4105 struct net_device *dev = ifp->idev->dev;
b7b1bfce 4106 struct in6_addr lladdr;
b173ee48 4107 bool send_rs, send_mld;
b7b1bfce 4108
c15b1cca 4109 addrconf_del_dad_work(ifp);
1da177e4
LT		 4110
4111 /*
4112 * Configure the address for reception. Now it is valid.
4113 */
4114
4115 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4116
026359bc
TA		 4117 /* If added prefix is link local and we are prepared to process
4118 router advertisements, start sending router solicitations.
1da177e4
LT		 4119 */
4120
1ec047eb 4121 read_lock_bh(&ifp->idev->lock);
11ffff75 4122 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 4123 send_rs = send_mld &&
4124 ipv6_accept_ra(ifp->idev) &&
bd11f074 4125 ifp->idev->cnf.rtr_solicits != 0 &&
b173ee48 4126 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 4127 read_unlock_bh(&ifp->idev->lock);
4128
b173ee48
HFS		 4129 /* While dad is in progress mld report's source address is in6_addrany.
4130 * Resend with proper ll now.
4131 */
4132 if (send_mld)
4133 ipv6_mc_dad_complete(ifp->idev);
4134
c76fe2d9
DA		 4135 /* send unsolicited NA if enabled */
4136 if (send_na &&
4137 (ifp->idev->cnf.ndisc_notify ||
4138 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4139 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4140 /*router=*/ !!ifp->idev->cnf.forwarding,
4141 /*solicited=*/ false, /*override=*/ true,
4142 /*inc_opt=*/ true);
4143 }
4144
1ec047eb 4145 if (send_rs) {
1da177e4
LT		 4146 /*
4147 * If a host as already performed a random delay
4148 * [...] as part of DAD [...] there is no need
4149 * to delay again before sending the first RS
4150 */
1ec047eb 4151 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 4152 return;
1ec047eb 4153 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 4154
b7b1bfce
HFS		 4155 write_lock_bh(&ifp->idev->lock);
4156 spin_lock(&ifp->lock);
bd11f074
MŻ		 4157 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4158 ifp->idev->cnf.rtr_solicit_interval);
b7b1bfce 4159 ifp->idev->rs_probes = 1;
1da177e4 4160 ifp->idev->if_flags |= IF_RS_SENT;
bd11f074 4161 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
b7b1bfce
HFS		 4162 spin_unlock(&ifp->lock);
4163 write_unlock_bh(&ifp->idev->lock);
1da177e4 4164 }
764d3be6
PA		 4165
4166 if (bump_id)
4167 rt_genid_bump_ipv6(dev_net(dev));
a11a7f71
MH		 4168
4169 /* Make sure that a new temporary address will be created
4170 * before this temporary address becomes deprecated.
4171 */
4172 if (ifp->flags & IFA_F_TEMPORARY)
4173 addrconf_verify_rtnl();
1da177e4
LT		 4174}
4175
e21e8467
SH		 4176static void addrconf_dad_run(struct inet6_dev *idev)
4177{
c5e33bdd
YH		 4178 struct inet6_ifaddr *ifp;
4179
4180 read_lock_bh(&idev->lock);
502a2ffd 4181 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 4182 spin_lock(&ifp->lock);
f2344a13
HX		 4183 if (ifp->flags & IFA_F_TENTATIVE &&
4184 ifp->state == INET6_IFADDR_STATE_DAD)
4185 addrconf_dad_kick(ifp);
21809faf 4186 spin_unlock(&ifp->lock);
c5e33bdd
YH		 4187 }
4188 read_unlock_bh(&idev->lock);
4189}
4190
1da177e4
LT		 4191#ifdef CONFIG_PROC_FS
4192struct if6_iter_state {
3c40090a 4193 struct seq_net_private p;
1da177e4 4194 int bucket;
1d578303 4195 int offset;
1da177e4
LT		 4196};
4197
1d578303 4198static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4 4199{
1da177e4 4200 struct if6_iter_state *state = seq->private;
1218854a 4201 struct net *net = seq_file_net(seq);
a5c1d98f 4202 struct inet6_ifaddr *ifa = NULL;
1d578303 4203 int p = 0;
1da177e4 4204
1d578303
MM		 4205 /* initial bucket if pos is 0 */
4206 if (pos == 0) {
4207 state->bucket = 0;
4208 state->offset = 0;
4209 }
4210
4211 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
a5c1d98f 4212 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
1d578303 4213 addr_lst) {
9f0d3c27
ED		 4214 if (!net_eq(dev_net(ifa->idev->dev), net))
4215 continue;
1d578303
MM		 4216 /* sync with offset */
4217 if (p < state->offset) {
4218 p++;
4219 continue;
4220 }
9f0d3c27 4221 return ifa;
1d578303
MM		 4222 }
4223
4224 /* prepare for next bucket */
4225 state->offset = 0;
4226 p = 0;
1da177e4 4227 }
c2e21293 4228 return NULL;
1da177e4
LT		 4229}
4230
c2e21293 4231static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4232 struct inet6_ifaddr *ifa)
1da177e4
LT		 4233{
4234 struct if6_iter_state *state = seq->private;
1218854a 4235 struct net *net = seq_file_net(seq);
1da177e4 4236
a5c1d98f 4237 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
9f0d3c27
ED		 4238 if (!net_eq(dev_net(ifa->idev->dev), net))
4239 continue;
1d578303 4240 state->offset++;
9f0d3c27 4241 return ifa;
1d578303 4242 }
3c40090a 4243
86f9bd1f 4244 state->offset = 0;
c2e21293 4245 while (++state->bucket < IN6_ADDR_HSIZE) {
a5c1d98f 4246 hlist_for_each_entry_rcu(ifa,
c2e21293 4247 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 4248 if (!net_eq(dev_net(ifa->idev->dev), net))
4249 continue;
9f0d3c27 4250 return ifa;
c2e21293 4251 }
1da177e4 4252 }
3c40090a 4253
c2e21293 4254 return NULL;
1da177e4
LT		 4255}
4256
1da177e4 4257static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
a5c1d98f 4258 __acquires(rcu)
1da177e4 4259{
a5c1d98f 4260 rcu_read_lock();
1d578303 4261 return if6_get_first(seq, *pos);
1da177e4
LT		 4262}
4263
4264static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4265{
4266 struct inet6_ifaddr *ifa;
4267
4268 ifa = if6_get_next(seq, v);
4269 ++*pos;
4270 return ifa;
4271}
4272
4273static void if6_seq_stop(struct seq_file *seq, void *v)
a5c1d98f 4274 __releases(rcu)
1da177e4 4275{
a5c1d98f 4276 rcu_read_unlock();
1da177e4
LT		 4277}
4278
4279static int if6_seq_show(struct seq_file *seq, void *v)
4280{
4281 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4282 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4283 &ifp->addr,
1da177e4
LT		 4284 ifp->idev->dev->ifindex,
4285 ifp->prefix_len,
4286 ifp->scope,
971a351c 4287 (u8) ifp->flags,
1da177e4
LT		 4288 ifp->idev->dev->name);
4289 return 0;
4290}
4291
56b3d975 4292static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4293 .start = if6_seq_start,
4294 .next = if6_seq_next,
4295 .show = if6_seq_show,
4296 .stop = if6_seq_stop,
4297};
4298
2c8c1e72 4299static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4300{
c3506372
CH		 4301 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4302 sizeof(struct if6_iter_state)))
1da177e4
LT		 4303 return -ENOMEM;
4304 return 0;
4305}
4306
2c8c1e72 4307static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4308{
ece31ffd 4309 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4310}
4311
4312static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4313 .init = if6_proc_net_init,
4314 .exit = if6_proc_net_exit,
3c40090a
DL		 4315};
4316
4317int __init if6_proc_init(void)
4318{
4319 return register_pernet_subsys(&if6_proc_net_ops);
4320}
4321
1da177e4
LT		 4322void if6_proc_exit(void)
4323{
3c40090a 4324 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4325}
4326#endif /* CONFIG_PROC_FS */
4327
07a93626 4328#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4329/* Check if address is a home address configured on any interface. */
b71d1d42 4330int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c 4331{
3f27fb23 4332 unsigned int hash = inet6_addr_hash(net, addr);
c2e21293 4333 struct inet6_ifaddr *ifp = NULL;
3f27fb23 4334 int ret = 0;
c2e21293 4335
4e5f47ab
ED		 4336 rcu_read_lock();
4337 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 4338 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 4339 continue;
caad295f 4340 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4341 (ifp->flags & IFA_F_HOMEADDRESS)) {
4342 ret = 1;
4343 break;
4344 }
4345 }
4e5f47ab 4346 rcu_read_unlock();
3b9f9a1c
NT		 4347 return ret;
4348}
4349#endif
4350
1da177e4
LT		 4351/*
4352 * Periodic address status verification
4353 */
4354
c15b1cca 4355static void addrconf_verify_rtnl(void)
1da177e4 4356{
b2db7564 4357 unsigned long now, next, next_sec, next_sched;
1da177e4 4358 struct inet6_ifaddr *ifp;
1da177e4
LT		 4359 int i;
4360
c15b1cca
HFS		 4361 ASSERT_RTNL();
4362
5c578aed 4363 rcu_read_lock_bh();
1da177e4 4364 now = jiffies;
b2db7564 4365 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4366
c15b1cca 4367 cancel_delayed_work(&addr_chk_work);
1da177e4 4368
bcdd553f 4369 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4370restart:
c15b1cca 4371 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 4372 unsigned long age;
1da177e4 4373
fad8da3e
YA		 4374 /* When setting preferred_lft to a value not zero or
4375 * infinity, while valid_lft is infinity
4376 * IFA_F_PERMANENT has a non-infinity life time.
4377 */
4378 if ((ifp->flags & IFA_F_PERMANENT) &&
4379 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4380 continue;
4381
4382 spin_lock(&ifp->lock);
b2db7564
YH		 4383 /* We try to batch several events at once. */
4384 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4385
8f27ebb9
YH		 4386 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4387 age >= ifp->valid_lft) {
1da177e4
LT		 4388 spin_unlock(&ifp->lock);
4389 in6_ifa_hold(ifp);
1da177e4
LT		 4390 ipv6_del_addr(ifp);
4391 goto restart;
8f27ebb9
YH		 4392 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4393 spin_unlock(&ifp->lock);
4394 continue;
1da177e4 4395 } else if (age >= ifp->prefered_lft) {
a1ed0526 4396 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4397 int deprecate = 0;
4398
4399 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4400 deprecate = 1;
4401 ifp->flags |= IFA_F_DEPRECATED;
4402 }
4403
fad8da3e
YA		 4404 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4405 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4406 next = ifp->tstamp + ifp->valid_lft * HZ;
4407
4408 spin_unlock(&ifp->lock);
4409
4410 if (deprecate) {
4411 in6_ifa_hold(ifp);
1da177e4
LT		 4412
4413 ipv6_ifa_notify(0, ifp);
4414 in6_ifa_put(ifp);
4415 goto restart;
4416 }
1da177e4
LT		 4417 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4418 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4419 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4420 ifp->idev->cnf.dad_transmits *
1f9248e5 4421 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 4422
1da177e4
LT		 4423 if (age >= ifp->prefered_lft - regen_advance) {
4424 struct inet6_ifaddr *ifpub = ifp->ifpub;
4425 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4426 next = ifp->tstamp + ifp->prefered_lft * HZ;
4427 if (!ifp->regen_count && ifpub) {
4428 ifp->regen_count++;
4429 in6_ifa_hold(ifp);
4430 in6_ifa_hold(ifpub);
4431 spin_unlock(&ifp->lock);
5c578aed 4432
291d809b
HY		 4433 spin_lock(&ifpub->lock);
4434 ifpub->regen_count = 0;
4435 spin_unlock(&ifpub->lock);
e64e469b 4436 rcu_read_unlock_bh();
fffcefe9 4437 ipv6_create_tempaddr(ifpub, ifp, true);
1da177e4
LT		 4438 in6_ifa_put(ifpub);
4439 in6_ifa_put(ifp);
e64e469b 4440 rcu_read_lock_bh();
1da177e4
LT		 4441 goto restart;
4442 }
4443 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4444 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4445 spin_unlock(&ifp->lock);
1da177e4
LT		 4446 } else {
4447 /* ifp->prefered_lft <= ifp->valid_lft */
4448 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4449 next = ifp->tstamp + ifp->prefered_lft * HZ;
4450 spin_unlock(&ifp->lock);
4451 }
4452 }
1da177e4
LT		 4453 }
4454
b2db7564
YH		 4455 next_sec = round_jiffies_up(next);
4456 next_sched = next;
4457
4458 /* If rounded timeout is accurate enough, accept it. */
4459 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4460 next_sched = next_sec;
4461
4462 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4463 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4464 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4465
e32ac250
JP		 4466 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4467 now, next, next_sec, next_sched);
c15b1cca 4468 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4469 rcu_read_unlock_bh();
1da177e4
LT		 4470}
4471
c15b1cca
HFS		 4472static void addrconf_verify_work(struct work_struct *w)
4473{
4474 rtnl_lock();
4475 addrconf_verify_rtnl();
4476 rtnl_unlock();
4477}
4478
4479static void addrconf_verify(void)
4480{
4481 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4482}
4483
caeaba79
ND		 4484static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4485 struct in6_addr **peer_pfx)
461d8837
TG		 4486{
4487 struct in6_addr *pfx = NULL;
4488
caeaba79
ND		 4489 *peer_pfx = NULL;
4490
461d8837
TG		 4491 if (addr)
4492 pfx = nla_data(addr);
4493
4494 if (local) {
4495 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4496 *peer_pfx = pfx;
4497 pfx = nla_data(local);
461d8837
TG		 4498 }
4499
4500 return pfx;
4501}
4502
ef7c79ed 4503static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4504 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4505 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4506 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4507 [IFA_FLAGS] = { .len = sizeof(u32) },
8308f3ff 4508 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
6ecf4c37 4509 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
461d8837
TG		 4510};
4511
1da177e4 4512static int
c21ef3e3
DA		 4513inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4514 struct netlink_ext_ack *extack)
1da177e4 4515{
3b1e0a65 4516 struct net *net = sock_net(skb->sk);
b933f716
TG		 4517 struct ifaddrmsg *ifm;
4518 struct nlattr *tb[IFA_MAX+1];
caeaba79 4519 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4520 u32 ifa_flags;
b933f716 4521 int err;
1da177e4 4522
fceb6435 4523 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4524 extack);
b933f716
TG		 4525 if (err < 0)
4526 return err;
4527
4528 ifm = nlmsg_data(nlh);
caeaba79 4529 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4530 if (!pfx)
1da177e4
LT		 4531 return -EINVAL;
4532
6046d5b4
HK		 4533 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4534
4535 /* We ignore other flags so far. */
4536 ifa_flags &= IFA_F_MANAGETEMPADDR;
4537
4538 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4539 ifm->ifa_prefixlen);
1da177e4
LT		 4540}
4541
8308f3ff
DA		 4542static int modify_prefix_route(struct inet6_ifaddr *ifp,
4543 unsigned long expires, u32 flags)
4544{
4545 struct fib6_info *f6i;
e7c7faa9 4546 u32 prio;
8308f3ff
DA		 4547
4548 f6i = addrconf_get_prefix_route(&ifp->addr,
4549 ifp->prefix_len,
4550 ifp->idev->dev,
4551 0, RTF_GATEWAY | RTF_DEFAULT);
4552 if (!f6i)
4553 return -ENOENT;
4554
e7c7faa9
DA		 4555 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4556 if (f6i->fib6_metric != prio) {
4557 /* delete old one */
4558 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
4559
8308f3ff
DA		 4560 /* add new one */
4561 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4562 ifp->rt_priority, ifp->idev->dev,
4563 expires, flags, GFP_KERNEL);
8308f3ff
DA		 4564 } else {
4565 if (!expires)
4566 fib6_clean_expires(f6i);
4567 else
4568 fib6_set_expires(f6i, expires);
4569
4570 fib6_info_release(f6i);
4571 }
4572
4573 return 0;
4574}
4575
d169a1f8 4576static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
081bba5b 4577{
6f704992
YH		 4578 u32 flags;
4579 clock_t expires;
4bed72e4 4580 unsigned long timeout;
53bd6749 4581 bool was_managetempaddr;
5b84efec 4582 bool had_prefixroute;
46d48046 4583
c15b1cca
HFS		 4584 ASSERT_RTNL();
4585
d169a1f8 4586 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
081bba5b
NT		 4587 return -EINVAL;
4588
d169a1f8 4589 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
53bd6749
JP		 4590 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4591 return -EINVAL;
4592
f1c02cfb 4593 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
d169a1f8 4594 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
f1c02cfb 4595
d169a1f8 4596 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4bed72e4
YH		 4597 if (addrconf_finite_timeout(timeout)) {
4598 expires = jiffies_to_clock_t(timeout * HZ);
d169a1f8 4599 cfg->valid_lft = timeout;
6f704992 4600 flags = RTF_EXPIRES;
4bed72e4
YH		 4601 } else {
4602 expires = 0;
4603 flags = 0;
d169a1f8 4604 cfg->ifa_flags |= IFA_F_PERMANENT;
6f704992 4605 }
081bba5b 4606
d169a1f8 4607 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4bed72e4
YH		 4608 if (addrconf_finite_timeout(timeout)) {
4609 if (timeout == 0)
d169a1f8
DA		 4610 cfg->ifa_flags |= IFA_F_DEPRECATED;
4611 cfg->preferred_lft = timeout;
4bed72e4 4612 }
081bba5b
NT		 4613
4614 spin_lock_bh(&ifp->lock);
53bd6749 4615 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4616 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4617 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4618 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4619 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4620 IFA_F_NOPREFIXROUTE);
d169a1f8 4621 ifp->flags |= cfg->ifa_flags;
081bba5b 4622 ifp->tstamp = jiffies;
d169a1f8
DA		 4623 ifp->valid_lft = cfg->valid_lft;
4624 ifp->prefered_lft = cfg->preferred_lft;
081bba5b 4625
8308f3ff
DA		 4626 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4627 ifp->rt_priority = cfg->rt_priority;
081bba5b
NT		 4628
4629 spin_unlock_bh(&ifp->lock);
4630 if (!(ifp->flags&IFA_F_TENTATIVE))
4631 ipv6_ifa_notify(0, ifp);
081bba5b 4632
d169a1f8 4633 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
8308f3ff
DA		 4634 int rc = -ENOENT;
4635
4636 if (had_prefixroute)
4637 rc = modify_prefix_route(ifp, expires, flags);
4638
4639 /* prefix route could have been deleted; if so restore it */
4640 if (rc == -ENOENT) {
4641 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4642 ifp->rt_priority, ifp->idev->dev,
4643 expires, flags, GFP_KERNEL);
4644 }
5b84efec
TH		 4645 } else if (had_prefixroute) {
4646 enum cleanup_prefix_rt_t action;
4647 unsigned long rt_expires;
4648
4649 write_lock_bh(&ifp->idev->lock);
4650 action = check_cleanup_prefix_route(ifp, &rt_expires);
4651 write_unlock_bh(&ifp->idev->lock);
4652
4653 if (action != CLEANUP_PREFIX_RT_NOP) {
4654 cleanup_prefix_route(ifp, rt_expires,
4655 action == CLEANUP_PREFIX_RT_DEL);
4656 }
761aac73 4657 }
53bd6749
JP		 4658
4659 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
d169a1f8
DA		 4660 if (was_managetempaddr &&
4661 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4662 cfg->valid_lft = 0;
4663 cfg->preferred_lft = 0;
4664 }
4665 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4666 cfg->preferred_lft, !was_managetempaddr,
4667 jiffies);
53bd6749
JP		 4668 }
4669
c15b1cca 4670 addrconf_verify_rtnl();
081bba5b
NT		 4671
4672 return 0;
4673}
4674
1da177e4 4675static int
c21ef3e3
DA		 4676inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4677 struct netlink_ext_ack *extack)
1da177e4 4678{
3b1e0a65 4679 struct net *net = sock_net(skb->sk);
461d8837
TG		 4680 struct ifaddrmsg *ifm;
4681 struct nlattr *tb[IFA_MAX+1];
19b1518c 4682 struct in6_addr *peer_pfx;
7198f8ce
TG		 4683 struct inet6_ifaddr *ifa;
4684 struct net_device *dev;
f1c02cfb 4685 struct inet6_dev *idev;
19b1518c 4686 struct ifa6_config cfg;
461d8837 4687 int err;
1da177e4 4688
fceb6435 4689 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4690 extack);
461d8837
TG		 4691 if (err < 0)
4692 return err;
4693
19b1518c
DA		 4694 memset(&cfg, 0, sizeof(cfg));
4695
461d8837 4696 ifm = nlmsg_data(nlh);
19b1518c
DA		 4697 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4698 if (!cfg.pfx)
1da177e4
LT		 4699 return -EINVAL;
4700
19b1518c
DA		 4701 cfg.peer_pfx = peer_pfx;
4702 cfg.plen = ifm->ifa_prefixlen;
8308f3ff
DA		 4703 if (tb[IFA_RT_PRIORITY])
4704 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4705
19b1518c
DA		 4706 cfg.valid_lft = INFINITY_LIFE_TIME;
4707 cfg.preferred_lft = INFINITY_LIFE_TIME;
4708
461d8837 4709 if (tb[IFA_CACHEINFO]) {
0778769d 4710 struct ifa_cacheinfo *ci;
461d8837
TG		 4711
4712 ci = nla_data(tb[IFA_CACHEINFO]);
19b1518c
DA		 4713 cfg.valid_lft = ci->ifa_valid;
4714 cfg.preferred_lft = ci->ifa_prefered;
0778769d
NT		 4715 }
4716
af284937 4717 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4718 if (!dev)
7198f8ce
TG		 4719 return -ENODEV;
4720
19b1518c
DA		 4721 if (tb[IFA_FLAGS])
4722 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4723 else
4724 cfg.ifa_flags = ifm->ifa_flags;
479840ff 4725
55ebaef1 4726 /* We ignore other flags so far. */
19b1518c
DA		 4727 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4728 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4729 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
f1c02cfb
SD		 4730
4731 idev = ipv6_find_idev(dev);
4732 if (IS_ERR(idev))
4733 return PTR_ERR(idev);
4734
4735 if (!ipv6_allow_optimistic_dad(net, idev))
19b1518c 4736 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
f1c02cfb 4737
19b1518c
DA		 4738 if (cfg.ifa_flags & IFA_F_NODAD &&
4739 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
f1c02cfb
SD		 4740 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4741 return -EINVAL;
4742 }
55ebaef1 4743
19b1518c 4744 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
63159f29 4745 if (!ifa) {
7198f8ce
TG		 4746 /*
4747 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4748 * userspace already relies on not having to provide this.
7198f8ce 4749 */
19b1518c 4750 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
081bba5b
NT		 4751 }
4752
7198f8ce
TG		 4753 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4754 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4755 err = -EEXIST;
4756 else
d169a1f8 4757 err = inet6_addr_modify(ifa, &cfg);
7198f8ce
TG		 4758
4759 in6_ifa_put(ifa);
4760
4761 return err;
1da177e4
LT		 4762}
4763
479840ff 4764static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4765 u8 scope, int ifindex)
4766{
4767 struct ifaddrmsg *ifm;
4768
4769 ifm = nlmsg_data(nlh);
4770 ifm->ifa_family = AF_INET6;
4771 ifm->ifa_prefixlen = prefixlen;
4772 ifm->ifa_flags = flags;
4773 ifm->ifa_scope = scope;
4774 ifm->ifa_index = ifindex;
4775}
4776
85486af0
TG		 4777static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4778 unsigned long tstamp, u32 preferred, u32 valid)
4779{
4780 struct ifa_cacheinfo ci;
4781
18a31e1e
TG		 4782 ci.cstamp = cstamp_delta(cstamp);
4783 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4784 ci.ifa_prefered = preferred;
4785 ci.ifa_valid = valid;
4786
4787 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4788}
4789
101bb229
TG		 4790static inline int rt_scope(int ifa_scope)
4791{
4792 if (ifa_scope & IFA_HOST)
4793 return RT_SCOPE_HOST;
4794 else if (ifa_scope & IFA_LINK)
4795 return RT_SCOPE_LINK;
4796 else if (ifa_scope & IFA_SITE)
4797 return RT_SCOPE_SITE;
4798 else
4799 return RT_SCOPE_UNIVERSE;
4800}
4801
0ab6803b
TG		 4802static inline int inet6_ifaddr_msgsize(void)
4803{
339bf98f 4804 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4805 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4806 + nla_total_size(16) /* IFA_ADDRESS */
479840ff 4807 + nla_total_size(sizeof(struct ifa_cacheinfo))
8308f3ff
DA		 4808 + nla_total_size(4) /* IFA_FLAGS */
4809 + nla_total_size(4) /* IFA_RT_PRIORITY */;
0ab6803b 4810}
c5396a31 4811
6ba1e6e8
DA		 4812enum addr_type_t {
4813 UNICAST_ADDR,
4814 MULTICAST_ADDR,
4815 ANYCAST_ADDR,
4816};
4817
203651b6
CB		 4818struct inet6_fill_args {
4819 u32 portid;
4820 u32 seq;
4821 int event;
4822 unsigned int flags;
4823 int netnsid;
6371a71f 4824 int ifindex;
6ba1e6e8 4825 enum addr_type_t type;
203651b6
CB		 4826};
4827
1da177e4 4828static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
203651b6 4829 struct inet6_fill_args *args)
1da177e4 4830{
1da177e4 4831 struct nlmsghdr *nlh;
85486af0 4832 u32 preferred, valid;
1da177e4 4833
203651b6
CB		 4834 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4835 sizeof(struct ifaddrmsg), args->flags);
63159f29 4836 if (!nlh)
26932566 4837 return -EMSGSIZE;
0ab6803b 4838
101bb229
TG		 4839 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4840 ifa->idev->dev->ifindex);
4841
203651b6
CB		 4842 if (args->netnsid >= 0 &&
4843 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
6ecf4c37
CB		 4844 goto error;
4845
fad8da3e
YA		 4846 if (!((ifa->flags&IFA_F_PERMANENT) &&
4847 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4848 preferred = ifa->prefered_lft;
4849 valid = ifa->valid_lft;
4850 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4851 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4852 if (preferred > tval)
4853 preferred -= tval;
4854 else
4855 preferred = 0;
f56619fc
BH		 4856 if (valid != INFINITY_LIFE_TIME) {
4857 if (valid > tval)
4858 valid -= tval;
4859 else
4860 valid = 0;
4861 }
1da177e4
LT		 4862 }
4863 } else {
85486af0
TG		 4864 preferred = INFINITY_LIFE_TIME;
4865 valid = INFINITY_LIFE_TIME;
4866 }
4867
7996c799 4868 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4869 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4870 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4871 goto error;
4872 } else
930345ea 4873 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4874 goto error;
4875
8308f3ff
DA		 4876 if (ifa->rt_priority &&
4877 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
4878 goto error;
4879
caeaba79
ND		 4880 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4881 goto error;
1da177e4 4882
479840ff
JP		 4883 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4884 goto error;
4885
053c095a
JB		 4886 nlmsg_end(skb, nlh);
4887 return 0;
caeaba79
ND		 4888
4889error:
4890 nlmsg_cancel(skb, nlh);
4891 return -EMSGSIZE;
1da177e4
LT		 4892}
4893
4894static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
203651b6 4895 struct inet6_fill_args *args)
1da177e4 4896{
1da177e4 4897 struct nlmsghdr *nlh;
101bb229
TG		 4898 u8 scope = RT_SCOPE_UNIVERSE;
4899 int ifindex = ifmca->idev->dev->ifindex;
4900
4901 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4902 scope = RT_SCOPE_SITE;
1da177e4 4903
203651b6
CB		 4904 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4905 sizeof(struct ifaddrmsg), args->flags);
63159f29 4906 if (!nlh)
26932566 4907 return -EMSGSIZE;
85486af0 4908
203651b6
CB		 4909 if (args->netnsid >= 0 &&
4910 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
6ecf4c37
CB		 4911 return -EMSGSIZE;
4912
0ab6803b 4913 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4914 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4915 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4916 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4917 nlmsg_cancel(skb, nlh);
4918 return -EMSGSIZE;
4919 }
85486af0 4920
053c095a
JB		 4921 nlmsg_end(skb, nlh);
4922 return 0;
1da177e4
LT		 4923}
4924
4925static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
203651b6 4926 struct inet6_fill_args *args)
1da177e4 4927{
9ee8cbb2
DA		 4928 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
4929 int ifindex = dev ? dev->ifindex : 1;
1da177e4 4930 struct nlmsghdr *nlh;
101bb229 4931 u8 scope = RT_SCOPE_UNIVERSE;
101bb229
TG		 4932
4933 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4934 scope = RT_SCOPE_SITE;
1da177e4 4935
203651b6
CB		 4936 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4937 sizeof(struct ifaddrmsg), args->flags);
63159f29 4938 if (!nlh)
26932566 4939 return -EMSGSIZE;
85486af0 4940
203651b6
CB		 4941 if (args->netnsid >= 0 &&
4942 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
6ecf4c37
CB		 4943 return -EMSGSIZE;
4944
0ab6803b 4945 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4946 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4947 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4948 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4949 nlmsg_cancel(skb, nlh);
4950 return -EMSGSIZE;
4951 }
1da177e4 4952
053c095a
JB		 4953 nlmsg_end(skb, nlh);
4954 return 0;
1da177e4
LT		 4955}
4956
234b27c3
ED		 4957/* called with rcu_read_lock() */
4958static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
fe884c2b 4959 struct netlink_callback *cb, int s_ip_idx,
6ba1e6e8 4960 struct inet6_fill_args *fillargs)
234b27c3 4961{
234b27c3
ED		 4962 struct ifmcaddr6 *ifmca;
4963 struct ifacaddr6 *ifaca;
fe884c2b 4964 int ip_idx = 0;
234b27c3 4965 int err = 1;
234b27c3
ED		 4966
4967 read_lock_bh(&idev->lock);
6ba1e6e8 4968 switch (fillargs->type) {
502a2ffd 4969 case UNICAST_ADDR: {
4970 struct inet6_ifaddr *ifa;
6ba1e6e8 4971 fillargs->event = RTM_NEWADDR;
502a2ffd 4972
234b27c3 4973 /* unicast address incl. temp addr */
502a2ffd 4974 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4ba4c566
DA		 4975 if (ip_idx < s_ip_idx)
4976 goto next;
6ba1e6e8 4977 err = inet6_fill_ifaddr(skb, ifa, fillargs);
053c095a 4978 if (err < 0)
234b27c3 4979 break;
63998ac2 4980 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4ba4c566
DA		 4981next:
4982 ip_idx++;
234b27c3
ED		 4983 }
4984 break;
502a2ffd 4985 }
234b27c3 4986 case MULTICAST_ADDR:
6ba1e6e8 4987 fillargs->event = RTM_GETMULTICAST;
203651b6 4988
234b27c3
ED		 4989 /* multicast address */
4990 for (ifmca = idev->mc_list; ifmca;
4991 ifmca = ifmca->next, ip_idx++) {
4992 if (ip_idx < s_ip_idx)
4993 continue;
6ba1e6e8 4994 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
053c095a 4995 if (err < 0)
234b27c3
ED		 4996 break;
4997 }
4998 break;
4999 case ANYCAST_ADDR:
6ba1e6e8 5000 fillargs->event = RTM_GETANYCAST;
234b27c3
ED		 5001 /* anycast address */
5002 for (ifaca = idev->ac_list; ifaca;
5003 ifaca = ifaca->aca_next, ip_idx++) {
5004 if (ip_idx < s_ip_idx)
5005 continue;
6ba1e6e8 5006 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
053c095a 5007 if (err < 0)
234b27c3
ED		 5008 break;
5009 }
5010 break;
5011 default:
5012 break;
5013 }
5014 read_unlock_bh(&idev->lock);
fe884c2b 5015 cb->args[2] = ip_idx;
234b27c3
ED		 5016 return err;
5017}
5018
ed6eff11
DA		 5019static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5020 struct inet6_fill_args *fillargs,
5021 struct net **tgt_net, struct sock *sk,
6371a71f 5022 struct netlink_callback *cb)
ed6eff11 5023{
6371a71f 5024 struct netlink_ext_ack *extack = cb->extack;
ed6eff11
DA		 5025 struct nlattr *tb[IFA_MAX+1];
5026 struct ifaddrmsg *ifm;
5027 int err, i;
5028
5029 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5030 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5031 return -EINVAL;
5032 }
5033
5034 ifm = nlmsg_data(nlh);
5035 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5036 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5037 return -EINVAL;
5038 }
6371a71f
DA		 5039
5040 fillargs->ifindex = ifm->ifa_index;
5041 if (fillargs->ifindex) {
5042 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5043 fillargs->flags |= NLM_F_DUMP_FILTERED;
ed6eff11
DA		 5044 }
5045
5046 err = nlmsg_parse_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5047 ifa_ipv6_policy, extack);
5048 if (err < 0)
5049 return err;
5050
5051 for (i = 0; i <= IFA_MAX; ++i) {
5052 if (!tb[i])
5053 continue;
5054
5055 if (i == IFA_TARGET_NETNSID) {
5056 struct net *net;
5057
5058 fillargs->netnsid = nla_get_s32(tb[i]);
5059 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5060 if (IS_ERR(net)) {
bf4cc40e 5061 fillargs->netnsid = -1;
ed6eff11
DA		 5062 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5063 return PTR_ERR(net);
5064 }
5065 *tgt_net = net;
5066 } else {
5067 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5068 return -EINVAL;
5069 }
5070 }
5071
5072 return 0;
5073}
5074
1da177e4
LT		 5075static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5076 enum addr_type_t type)
5077{
ed6eff11 5078 const struct nlmsghdr *nlh = cb->nlh;
6ba1e6e8
DA		 5079 struct inet6_fill_args fillargs = {
5080 .portid = NETLINK_CB(cb->skb).portid,
5081 .seq = cb->nlh->nlmsg_seq,
5082 .flags = NLM_F_MULTI,
5083 .netnsid = -1,
5084 .type = type,
5085 };
234b27c3 5086 struct net *net = sock_net(skb->sk);
6ecf4c37 5087 struct net *tgt_net = net;
fe884c2b 5088 int idx, s_idx, s_ip_idx;
234b27c3 5089 int h, s_h;
1da177e4 5090 struct net_device *dev;
234b27c3
ED		 5091 struct inet6_dev *idev;
5092 struct hlist_head *head;
242afaa6 5093 int err = 0;
1ab1457c 5094
234b27c3
ED		 5095 s_h = cb->args[0];
5096 s_idx = idx = cb->args[1];
fe884c2b 5097 s_ip_idx = cb->args[2];
5d5619b4 5098
ed6eff11 5099 if (cb->strict_check) {
ed6eff11 5100 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
6371a71f 5101 skb->sk, cb);
ed6eff11 5102 if (err < 0)
242afaa6 5103 goto put_tgt_net;
6371a71f 5104
242afaa6 5105 err = 0;
6371a71f
DA		 5106 if (fillargs.ifindex) {
5107 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
242afaa6
DA		 5108 if (!dev) {
5109 err = -ENODEV;
5110 goto put_tgt_net;
5111 }
6371a71f
DA		 5112 idev = __in6_dev_get(dev);
5113 if (idev) {
5114 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5115 &fillargs);
5116 }
5117 goto put_tgt_net;
5118 }
6ecf4c37
CB		 5119 }
5120
234b27c3 5121 rcu_read_lock();
6ecf4c37 5122 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
234b27c3
ED		 5123 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5124 idx = 0;
6ecf4c37 5125 head = &tgt_net->dev_index_head[h];
b67bfe0d 5126 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 5127 if (idx < s_idx)
5128 goto cont;
4b97efdf 5129 if (h > s_h || idx > s_idx)
234b27c3 5130 s_ip_idx = 0;
e21e8467
SH		 5131 idev = __in6_dev_get(dev);
5132 if (!idev)
234b27c3
ED		 5133 goto cont;
5134
fe884c2b 5135 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
6ba1e6e8 5136 &fillargs) < 0)
234b27c3 5137 goto done;
7562f876 5138cont:
234b27c3
ED		 5139 idx++;
5140 }
1da177e4 5141 }
234b27c3
ED		 5142done:
5143 rcu_read_unlock();
5144 cb->args[0] = h;
5145 cb->args[1] = idx;
6371a71f 5146put_tgt_net:
6ba1e6e8 5147 if (fillargs.netnsid >= 0)
6ecf4c37 5148 put_net(tgt_net);
234b27c3 5149
242afaa6 5150 return err < 0 ? err : skb->len;
1da177e4
LT		 5151}
5152
5153static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5154{
5155 enum addr_type_t type = UNICAST_ADDR;
b854272b 5156
1da177e4
LT		 5157 return inet6_dump_addr(skb, cb, type);
5158}
5159
5160static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5161{
5162 enum addr_type_t type = MULTICAST_ADDR;
b854272b 5163
1da177e4
LT		 5164 return inet6_dump_addr(skb, cb, type);
5165}
5166
5167
5168static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5169{
5170 enum addr_type_t type = ANYCAST_ADDR;
b854272b 5171
1da177e4
LT		 5172 return inet6_dump_addr(skb, cb, type);
5173}
5174
c21ef3e3
DA		 5175static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5176 struct netlink_ext_ack *extack)
6c223828 5177{
3b1e0a65 5178 struct net *net = sock_net(in_skb->sk);
203651b6
CB		 5179 struct inet6_fill_args fillargs = {
5180 .portid = NETLINK_CB(in_skb).portid,
5181 .seq = nlh->nlmsg_seq,
5182 .event = RTM_NEWADDR,
5183 .flags = 0,
5184 .netnsid = -1,
5185 };
6ecf4c37 5186 struct net *tgt_net = net;
1b29fc2c
TG		 5187 struct ifaddrmsg *ifm;
5188 struct nlattr *tb[IFA_MAX+1];
caeaba79 5189 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 5190 struct net_device *dev = NULL;
5191 struct inet6_ifaddr *ifa;
5192 struct sk_buff *skb;
6c223828
NT		 5193 int err;
5194
fceb6435 5195 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 5196 extack);
1b29fc2c 5197 if (err < 0)
c24675f8 5198 return err;
1b29fc2c 5199
6ecf4c37 5200 if (tb[IFA_TARGET_NETNSID]) {
203651b6 5201 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
6ecf4c37
CB		 5202
5203 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
203651b6 5204 fillargs.netnsid);
6ecf4c37
CB		 5205 if (IS_ERR(tgt_net))
5206 return PTR_ERR(tgt_net);
5207 }
5208
caeaba79 5209 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
c24675f8
FW		 5210 if (!addr)
5211 return -EINVAL;
6c223828 5212
1b29fc2c 5213 ifm = nlmsg_data(nlh);
6c223828 5214 if (ifm->ifa_index)
6ecf4c37 5215 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
6c223828 5216
6ecf4c37 5217 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
e21e8467 5218 if (!ifa) {
1b29fc2c
TG		 5219 err = -EADDRNOTAVAIL;
5220 goto errout;
5221 }
6c223828 5222
e21e8467
SH		 5223 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5224 if (!skb) {
6c223828 5225 err = -ENOBUFS;
1b29fc2c 5226 goto errout_ifa;
6c223828
NT		 5227 }
5228
203651b6 5229 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
26932566
PM		 5230 if (err < 0) {
5231 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5232 WARN_ON(err == -EMSGSIZE);
5233 kfree_skb(skb);
5234 goto errout_ifa;
5235 }
6ecf4c37 5236 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
1b29fc2c 5237errout_ifa:
6c223828 5238 in6_ifa_put(ifa);
1b29fc2c 5239errout:
c24675f8
FW		 5240 if (dev)
5241 dev_put(dev);
203651b6 5242 if (fillargs.netnsid >= 0)
6ecf4c37
CB		 5243 put_net(tgt_net);
5244
6c223828 5245 return err;
6c223828
NT		 5246}
5247
1da177e4
LT		 5248static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5249{
5250 struct sk_buff *skb;
c346dca1 5251 struct net *net = dev_net(ifa->idev->dev);
203651b6
CB		 5252 struct inet6_fill_args fillargs = {
5253 .portid = 0,
5254 .seq = 0,
5255 .event = event,
5256 .flags = 0,
5257 .netnsid = -1,
5258 };
5d620266 5259 int err = -ENOBUFS;
1da177e4 5260
0ab6803b 5261 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 5262 if (!skb)
5d620266
TG		 5263 goto errout;
5264
203651b6 5265 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
26932566
PM		 5266 if (err < 0) {
5267 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5268 WARN_ON(err == -EMSGSIZE);
5269 kfree_skb(skb);
5270 goto errout;
5271 }
1ce85fe4
PNA		 5272 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5273 return;
5d620266
TG		 5274errout:
5275 if (err < 0)
6fda7350 5276 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 5277}
5278
b6f99a21 5279static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 5280 __s32 *array, int bytes)
5281{
04561c1f
TG		 5282 BUG_ON(bytes < (DEVCONF_MAX * 4));
5283
1da177e4
LT		 5284 memset(array, 0, bytes);
5285 array[DEVCONF_FORWARDING] = cnf->forwarding;
5286 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5287 array[DEVCONF_MTU6] = cnf->mtu6;
5288 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5289 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5290 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5291 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5292 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 5293 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5294 jiffies_to_msecs(cnf->rtr_solicit_interval);
bd11f074
MŻ		 5295 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5296 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
93908d19
TG		 5297 array[DEVCONF_RTR_SOLICIT_DELAY] =
5298 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 5299 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 5300 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5301 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5302 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5303 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 5304 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5305 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5306 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5307 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5308 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 5309 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 5310 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 5311 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 5312 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 5313#ifdef CONFIG_IPV6_ROUTER_PREF
5314 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 5315 array[DEVCONF_RTR_PROBE_INTERVAL] =
5316 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 5317#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 5318 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
09c884d4
YH		 5319 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5320#endif
930d6ff2 5321#endif
fbea49e1 5322 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 5323 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 5324#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5325 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 5326 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 5327#endif
7bc570c8
YH		 5328#ifdef CONFIG_IPV6_MROUTE
5329 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5330#endif
778d80be 5331 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 5332 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 5333 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 5334 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 5335 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 5336 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 5337 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 5338 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 5339 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 5340 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 5341 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 5342 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 5343 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1ababeba 5344 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
bf355b8d
DL		 5345#ifdef CONFIG_IPV6_SEG6_HMAC
5346 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5347#endif
adc176c5 5348 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
d35a00b8 5349 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
df789fe7 5350 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
2210d6b2 5351 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
1da177e4
LT		 5352}
5353
b382b191
TG		 5354static inline size_t inet6_ifla6_size(void)
5355{
5356 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5357 + nla_total_size(sizeof(struct ifla_cacheinfo))
5358 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5359 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4 5360 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
bdd72f41
SD		 5361 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5362 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5363 + 0;
b382b191
TG		 5364}
5365
339bf98f
TG		 5366static inline size_t inet6_if_nlmsg_size(void)
5367{
5368 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5369 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5370 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5371 + nla_total_size(4) /* IFLA_MTU */
5372 + nla_total_size(4) /* IFLA_LINK */
0344338b 5373 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 5374 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 5375}
c5396a31 5376
be281e55 5377static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
aca05671 5378 int bytes)
7f7d9a6b
HX		 5379{
5380 int i;
aca05671 5381 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
7f7d9a6b
HX		 5382 BUG_ON(pad < 0);
5383
5384 /* Use put_unaligned() because stats may not be aligned for u64. */
aca05671
JH		 5385 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5386 for (i = 1; i < ICMP6_MIB_MAX; i++)
be281e55 5387 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b 5388
aca05671 5389 memset(&stats[ICMP6_MIB_MAX], 0, pad);
7f7d9a6b
HX		 5390}
5391
698365fa 5392static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 5393 int bytes, size_t syncpoff)
4ce3c183 5394{
a3a77372
R		 5395 int i, c;
5396 u64 buff[IPSTATS_MIB_MAX];
5397 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5398
4ce3c183
ED		 5399 BUG_ON(pad < 0);
5400
a3a77372
R		 5401 memset(buff, 0, sizeof(buff));
5402 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 5403
a3a77372
R		 5404 for_each_possible_cpu(c) {
5405 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5406 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5407 }
5408
5409 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5410 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 5411}
5412
7f7d9a6b
HX		 5413static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5414 int bytes)
5415{
e21e8467 5416 switch (attrtype) {
7f7d9a6b 5417 case IFLA_INET6_STATS:
a3a77372
R		 5418 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5419 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 5420 break;
5421 case IFLA_INET6_ICMP6STATS:
aca05671 5422 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
7f7d9a6b
HX		 5423 break;
5424 }
5425}
5426
d5566fd7
SV		 5427static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5428 u32 ext_filter_mask)
b382b191
TG		 5429{
5430 struct nlattr *nla;
5431 struct ifla_cacheinfo ci;
5432
c78679e8
DM		 5433 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5434 goto nla_put_failure;
b382b191 5435 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 5436 ci.tstamp = cstamp_delta(idev->tstamp);
5437 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 5438 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 5439 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5440 goto nla_put_failure;
b382b191 5441 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 5442 if (!nla)
b382b191
TG		 5443 goto nla_put_failure;
5444 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5445
5446 /* XXX - MC not implemented */
5447
d5566fd7
SV		 5448 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5449 return 0;
5450
b382b191 5451 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 5452 if (!nla)
b382b191
TG		 5453 goto nla_put_failure;
5454 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5455
5456 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 5457 if (!nla)
b382b191
TG		 5458 goto nla_put_failure;
5459 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5460
f53adae4 5461 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 5462 if (!nla)
f53adae4 5463 goto nla_put_failure;
bc91b0f0 5464
d35a00b8 5465 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
bc91b0f0
JP		 5466 goto nla_put_failure;
5467
f53adae4
DB		 5468 read_lock_bh(&idev->lock);
5469 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5470 read_unlock_bh(&idev->lock);
5471
b382b191
TG		 5472 return 0;
5473
5474nla_put_failure:
5475 return -EMSGSIZE;
5476}
5477
b1974ed0
AR		 5478static size_t inet6_get_link_af_size(const struct net_device *dev,
5479 u32 ext_filter_mask)
b382b191
TG		 5480{
5481 if (!__in6_dev_get(dev))
5482 return 0;
5483
5484 return inet6_ifla6_size();
5485}
5486
d5566fd7
SV		 5487static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5488 u32 ext_filter_mask)
b382b191
TG		 5489{
5490 struct inet6_dev *idev = __in6_dev_get(dev);
5491
5492 if (!idev)
5493 return -ENODATA;
5494
d5566fd7 5495 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5496 return -EMSGSIZE;
5497
5498 return 0;
5499}
5500
f53adae4
DB		 5501static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5502{
f53adae4
DB		 5503 struct inet6_ifaddr *ifp;
5504 struct net_device *dev = idev->dev;
47e27d5e 5505 bool clear_token, update_rs = false;
dc848292 5506 struct in6_addr ll_addr;
f53adae4 5507
c15b1cca
HFS		 5508 ASSERT_RTNL();
5509
63159f29 5510 if (!token)
f53adae4 5511 return -EINVAL;
f53adae4
DB		 5512 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5513 return -EINVAL;
f53adae4
DB		 5514 if (!ipv6_accept_ra(idev))
5515 return -EINVAL;
bd11f074 5516 if (idev->cnf.rtr_solicits == 0)
f53adae4
DB		 5517 return -EINVAL;
5518
5519 write_lock_bh(&idev->lock);
5520
5521 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5522 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5523
5524 write_unlock_bh(&idev->lock);
5525
47e27d5e
DB		 5526 clear_token = ipv6_addr_any(token);
5527 if (clear_token)
5528 goto update_lft;
5529
dc848292
HFS		 5530 if (!idev->dead && (idev->if_flags & IF_READY) &&
5531 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5532 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5533 /* If we're not ready, then normal ifup will take care
5534 * of this. Otherwise, we need to request our rs here.
5535 */
5536 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5537 update_rs = true;
5538 }
f53adae4 5539
47e27d5e 5540update_lft:
f53adae4 5541 write_lock_bh(&idev->lock);
fc403832 5542
77ecaace 5543 if (update_rs) {
fc403832 5544 idev->if_flags |= IF_RS_SENT;
bd11f074
MŻ		 5545 idev->rs_interval = rfc3315_s14_backoff_init(
5546 idev->cnf.rtr_solicit_interval);
77ecaace 5547 idev->rs_probes = 1;
bd11f074 5548 addrconf_mod_rs_timer(idev, idev->rs_interval);
77ecaace 5549 }
f53adae4
DB		 5550
5551 /* Well, that's kinda nasty ... */
5552 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5553 spin_lock(&ifp->lock);
617fe29d 5554 if (ifp->tokenized) {
f53adae4
DB		 5555 ifp->valid_lft = 0;
5556 ifp->prefered_lft = 0;
5557 }
5558 spin_unlock(&ifp->lock);
5559 }
5560
5561 write_unlock_bh(&idev->lock);
b2ed64a9 5562 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 5563 addrconf_verify_rtnl();
f53adae4
DB		 5564 return 0;
5565}
5566
11b1f828
DB		 5567static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5568 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5569 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5570};
5571
5572static int inet6_validate_link_af(const struct net_device *dev,
5573 const struct nlattr *nla)
5574{
5575 struct nlattr *tb[IFLA_INET6_MAX + 1];
5576
5577 if (dev && !__in6_dev_get(dev))
5578 return -EAFNOSUPPORT;
5579
fceb6435
JB		 5580 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5581 NULL);
11b1f828
DB		 5582}
5583
d35a00b8
FJ		 5584static int check_addr_gen_mode(int mode)
5585{
5586 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5587 mode != IN6_ADDR_GEN_MODE_NONE &&
5588 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5589 mode != IN6_ADDR_GEN_MODE_RANDOM)
5590 return -EINVAL;
5591 return 1;
5592}
5593
5594static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5595 int mode)
5596{
5597 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5598 !idev->cnf.stable_secret.initialized &&
5599 !net->ipv6.devconf_dflt->stable_secret.initialized)
5600 return -EINVAL;
5601 return 1;
5602}
5603
f53adae4
DB		 5604static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5605{
5606 int err = -EINVAL;
5607 struct inet6_dev *idev = __in6_dev_get(dev);
5608 struct nlattr *tb[IFLA_INET6_MAX + 1];
5609
5610 if (!idev)
5611 return -EAFNOSUPPORT;
5612
fceb6435 5613 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
f53adae4
DB		 5614 BUG();
5615
bc91b0f0 5616 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 5617 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 5618 if (err)
5619 return err;
5620 }
5621
5622 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5623 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5624
d35a00b8
FJ		 5625 if (check_addr_gen_mode(mode) < 0 ||
5626 check_stable_privacy(idev, dev_net(dev), mode) < 0)
bc91b0f0 5627 return -EINVAL;
622c81d5 5628
d35a00b8 5629 idev->cnf.addr_gen_mode = mode;
bc91b0f0
JP		 5630 err = 0;
5631 }
f53adae4
DB		 5632
5633 return err;
5634}
5635
1ab1457c 5636static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5637 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5638{
04561c1f 5639 struct net_device *dev = idev->dev;
04561c1f
TG		 5640 struct ifinfomsg *hdr;
5641 struct nlmsghdr *nlh;
5642 void *protoinfo;
04561c1f 5643
15e47304 5644 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5645 if (!nlh)
26932566 5646 return -EMSGSIZE;
04561c1f
TG		 5647
5648 hdr = nlmsg_data(nlh);
5649 hdr->ifi_family = AF_INET6;
5650 hdr->__ifi_pad = 0;
5651 hdr->ifi_type = dev->type;
5652 hdr->ifi_index = dev->ifindex;
5653 hdr->ifi_flags = dev_get_flags(dev);
5654 hdr->ifi_change = 0;
5655
c78679e8
DM		 5656 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5657 (dev->addr_len &&
5658 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5659 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5660 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5661 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5662 nla_put_u8(skb, IFLA_OPERSTATE,
5663 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5664 goto nla_put_failure;
04561c1f 5665 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 5666 if (!protoinfo)
04561c1f 5667 goto nla_put_failure;
1da177e4 5668
d5566fd7 5669 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5670 goto nla_put_failure;
1da177e4 5671
04561c1f 5672 nla_nest_end(skb, protoinfo);
053c095a
JB		 5673 nlmsg_end(skb, nlh);
5674 return 0;
1da177e4 5675
04561c1f 5676nla_put_failure:
26932566
PM		 5677 nlmsg_cancel(skb, nlh);
5678 return -EMSGSIZE;
1da177e4
LT		 5679}
5680
786e0007
DA		 5681static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5682 struct netlink_ext_ack *extack)
5683{
5684 struct ifinfomsg *ifm;
5685
5686 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5687 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5688 return -EINVAL;
5689 }
5690
5691 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5692 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5693 return -EINVAL;
5694 }
5695
5696 ifm = nlmsg_data(nlh);
5697 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5698 ifm->ifi_change || ifm->ifi_index) {
5699 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5700 return -EINVAL;
5701 }
5702
5703 return 0;
5704}
5705
1da177e4
LT		 5706static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5707{
3b1e0a65 5708 struct net *net = sock_net(skb->sk);
84d2697d 5709 int h, s_h;
434a8a58 5710 int idx = 0, s_idx;
1da177e4
LT		 5711 struct net_device *dev;
5712 struct inet6_dev *idev;
84d2697d 5713 struct hlist_head *head;
1da177e4 5714
786e0007
DA		 5715 /* only requests using strict checking can pass data to
5716 * influence the dump
5717 */
5718 if (cb->strict_check) {
5719 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
5720
5721 if (err < 0)
5722 return err;
5723 }
5724
84d2697d
ED		 5725 s_h = cb->args[0];
5726 s_idx = cb->args[1];
5727
5728 rcu_read_lock();
5729 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5730 idx = 0;
5731 head = &net->dev_index_head[h];
b67bfe0d 5732 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5733 if (idx < s_idx)
5734 goto cont;
5735 idev = __in6_dev_get(dev);
5736 if (!idev)
5737 goto cont;
5738 if (inet6_fill_ifinfo(skb, idev,
15e47304 5739 NETLINK_CB(cb->skb).portid,
84d2697d 5740 cb->nlh->nlmsg_seq,
053c095a 5741 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5742 goto out;
7562f876 5743cont:
84d2697d
ED		 5744 idx++;
5745 }
1da177e4 5746 }
84d2697d
ED		 5747out:
5748 rcu_read_unlock();
5749 cb->args[1] = idx;
5750 cb->args[0] = h;
1da177e4
LT		 5751
5752 return skb->len;
5753}
5754
5755void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5756{
5757 struct sk_buff *skb;
c346dca1 5758 struct net *net = dev_net(idev->dev);
8d7a76c9 5759 int err = -ENOBUFS;
1ab1457c 5760
339bf98f 5761 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5762 if (!skb)
8d7a76c9
TG		 5763 goto errout;
5764
5765 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5766 if (err < 0) {
5767 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5768 WARN_ON(err == -EMSGSIZE);
5769 kfree_skb(skb);
5770 goto errout;
5771 }
5f75a104 5772 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5773 return;
8d7a76c9
TG		 5774errout:
5775 if (err < 0)
5f75a104 5776 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5777}
5778
339bf98f
TG		 5779static inline size_t inet6_prefix_nlmsg_size(void)
5780{
5781 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5782 + nla_total_size(sizeof(struct in6_addr))
5783 + nla_total_size(sizeof(struct prefix_cacheinfo));
5784}
c5396a31 5785
1da177e4 5786static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5787 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5788 int event, unsigned int flags)
1da177e4 5789{
6051e2f4
TG		 5790 struct prefixmsg *pmsg;
5791 struct nlmsghdr *nlh;
1da177e4
LT		 5792 struct prefix_cacheinfo ci;
5793
15e47304 5794 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5795 if (!nlh)
26932566 5796 return -EMSGSIZE;
6051e2f4
TG		 5797
5798 pmsg = nlmsg_data(nlh);
1da177e4 5799 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5800 pmsg->prefix_pad1 = 0;
5801 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5802 pmsg->prefix_ifindex = idev->dev->ifindex;
5803 pmsg->prefix_len = pinfo->prefix_len;
5804 pmsg->prefix_type = pinfo->type;
8a47077a 5805 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5806 pmsg->prefix_flags = 0;
5807 if (pinfo->onlink)
5808 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5809 if (pinfo->autoconf)
5810 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5811
c78679e8
DM		 5812 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5813 goto nla_put_failure;
1da177e4
LT		 5814 ci.preferred_time = ntohl(pinfo->prefered);
5815 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5816 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5817 goto nla_put_failure;
053c095a
JB		 5818 nlmsg_end(skb, nlh);
5819 return 0;
1da177e4 5820
6051e2f4 5821nla_put_failure:
26932566
PM		 5822 nlmsg_cancel(skb, nlh);
5823 return -EMSGSIZE;
1da177e4
LT		 5824}
5825
1ab1457c 5826static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5827 struct prefix_info *pinfo)
5828{
5829 struct sk_buff *skb;
c346dca1 5830 struct net *net = dev_net(idev->dev);
8c384bfa 5831 int err = -ENOBUFS;
1da177e4 5832
339bf98f 5833 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5834 if (!skb)
8c384bfa
TG		 5835 goto errout;
5836
5837 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5838 if (err < 0) {
5839 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5840 WARN_ON(err == -EMSGSIZE);
5841 kfree_skb(skb);
5842 goto errout;
5843 }
1ce85fe4
PNA		 5844 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5845 return;
8c384bfa
TG		 5846errout:
5847 if (err < 0)
6fda7350 5848 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5849}
5850
1da177e4
LT		 5851static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5852{
63998ac2
ND		 5853 struct net *net = dev_net(ifp->idev->dev);
5854
c15b1cca
HFS		 5855 if (event)
5856 ASSERT_RTNL();
5857
1da177e4
LT		 5858 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5859
5860 switch (event) {
5861 case RTM_NEWADDR:
95c385b4
NH		 5862 /*
5863 * If the address was optimistic
5864 * we inserted the route at the start of
5865 * our DAD process, so we don't need
5866 * to do it again
5867 */
93c2fb25 5868 if (!rcu_access_pointer(ifp->rt->fib6_node))
afb1d4b5 5869 ip6_ins_rt(net, ifp->rt);
1da177e4
LT		 5870 if (ifp->idev->cnf.forwarding)
5871 addrconf_join_anycast(ifp);
7996c799 5872 if (!ipv6_addr_any(&ifp->peer_addr))
8308f3ff 5873 addrconf_prefix_route(&ifp->peer_addr, 128, 0,
acb54e3c 5874 ifp->idev->dev, 0, 0,
27b10608 5875 GFP_ATOMIC);
1da177e4
LT		 5876 break;
5877 case RTM_DELADDR:
5878 if (ifp->idev->cnf.forwarding)
5879 addrconf_leave_anycast(ifp);
5880 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5881 if (!ipv6_addr_any(&ifp->peer_addr)) {
8d1c802b 5882 struct fib6_info *rt;
caeaba79 5883
e7478dfc
ND		 5884 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5885 ifp->idev->dev, 0, 0);
8e3d5be7 5886 if (rt)
afb1d4b5 5887 ip6_del_rt(net, rt);
caeaba79 5888 }
38bd10c4 5889 if (ifp->rt) {
93531c67
DA		 5890 ip6_del_rt(net, ifp->rt);
5891 ifp->rt = NULL;
38bd10c4 5892 }
705f1c86 5893 rt_genid_bump_ipv6(net);
1da177e4
LT		 5894 break;
5895 }
63998ac2 5896 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5897}
5898
5899static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5900{
8814c4b5 5901 rcu_read_lock_bh();
1da177e4
LT		 5902 if (likely(ifp->idev->dead == 0))
5903 __ipv6_ifa_notify(event, ifp);
8814c4b5 5904 rcu_read_unlock_bh();
1da177e4
LT		 5905}
5906
5907#ifdef CONFIG_SYSCTL
5908
5909static
fe2c6338 5910int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5911 void __user *buffer, size_t *lenp, loff_t *ppos)
5912{
5913 int *valp = ctl->data;
5914 int val = *valp;
88af182e 5915 loff_t pos = *ppos;
fe2c6338 5916 struct ctl_table lctl;
1da177e4
LT		 5917 int ret;
5918
013d97e9
FR		 5919 /*
5920 * ctl->data points to idev->cnf.forwarding, we should
5921 * not modify it until we get the rtnl lock.
5922 */
5923 lctl = *ctl;
5924 lctl.data = &val;
5925
5926 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5927
c8fecf22 5928 if (write)
b325fddb 5929 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5930 if (ret)
5931 *ppos = pos;
1ab1457c 5932 return ret;
1da177e4
LT		 5933}
5934
77751427
ML		 5935static
5936int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5937 void __user *buffer, size_t *lenp, loff_t *ppos)
5938{
5939 struct inet6_dev *idev = ctl->extra1;
5940 int min_mtu = IPV6_MIN_MTU;
5941 struct ctl_table lctl;
5942
5943 lctl = *ctl;
5944 lctl.extra1 = &min_mtu;
5945 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5946
5947 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5948}
5949
56d417b1
BH		 5950static void dev_disable_change(struct inet6_dev *idev)
5951{
75538c2b
CW		 5952 struct netdev_notifier_info info;
5953
56d417b1
BH		 5954 if (!idev || !idev->dev)
5955 return;
5956
75538c2b 5957 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5958 if (idev->cnf.disable_ipv6)
75538c2b 5959 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5960 else
75538c2b 5961 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5962}
5963
5964static void addrconf_disable_change(struct net *net, __s32 newf)
5965{
5966 struct net_device *dev;
5967 struct inet6_dev *idev;
5968
03e4deff 5969 for_each_netdev(net, dev) {
56d417b1
BH		 5970 idev = __in6_dev_get(dev);
5971 if (idev) {
5972 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5973 idev->cnf.disable_ipv6 = newf;
5974 if (changed)
5975 dev_disable_change(idev);
5976 }
56d417b1 5977 }
56d417b1
BH		 5978}
5979
013d97e9 5980static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5981{
5982 struct net *net;
013d97e9
FR		 5983 int old;
5984
5985 if (!rtnl_trylock())
5986 return restart_syscall();
56d417b1
BH		 5987
5988 net = (struct net *)table->extra2;
013d97e9
FR		 5989 old = *p;
5990 *p = newf;
56d417b1 5991
013d97e9
FR		 5992 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5993 rtnl_unlock();
56d417b1 5994 return 0;
88af182e 5995 }
56d417b1
BH		 5996
5997 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5998 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5999 addrconf_disable_change(net, newf);
013d97e9 6000 } else if ((!newf) ^ (!old))
56d417b1
BH		 6001 dev_disable_change((struct inet6_dev *)table->extra1);
6002
6003 rtnl_unlock();
6004 return 0;
6005}
6006
6007static
fe2c6338 6008int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 6009 void __user *buffer, size_t *lenp, loff_t *ppos)
6010{
6011 int *valp = ctl->data;
6012 int val = *valp;
88af182e 6013 loff_t pos = *ppos;
fe2c6338 6014 struct ctl_table lctl;
56d417b1
BH		 6015 int ret;
6016
013d97e9
FR		 6017 /*
6018 * ctl->data points to idev->cnf.disable_ipv6, we should
6019 * not modify it until we get the rtnl lock.
6020 */
6021 lctl = *ctl;
6022 lctl.data = &val;
6023
6024 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 6025
6026 if (write)
6027 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 6028 if (ret)
6029 *ppos = pos;
56d417b1
BH		 6030 return ret;
6031}
6032
c92d5491 6033static
6034int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6035 void __user *buffer, size_t *lenp, loff_t *ppos)
6036{
6037 int *valp = ctl->data;
6038 int ret;
6039 int old, new;
6040
6041 old = *valp;
6042 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6043 new = *valp;
6044
6045 if (write && old != new) {
6046 struct net *net = ctl->extra2;
6047
6048 if (!rtnl_trylock())
6049 return restart_syscall();
6050
6051 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
85b3daad
DA		 6052 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6053 NETCONFA_PROXY_NEIGH,
c92d5491 6054 NETCONFA_IFINDEX_DEFAULT,
6055 net->ipv6.devconf_dflt);
6056 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
85b3daad
DA		 6057 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6058 NETCONFA_PROXY_NEIGH,
c92d5491 6059 NETCONFA_IFINDEX_ALL,
6060 net->ipv6.devconf_all);
6061 else {
6062 struct inet6_dev *idev = ctl->extra1;
6063
85b3daad
DA		 6064 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6065 NETCONFA_PROXY_NEIGH,
c92d5491 6066 idev->dev->ifindex,
6067 &idev->cnf);
6068 }
6069 rtnl_unlock();
6070 }
6071
6072 return ret;
6073}
6074
d35a00b8
FJ		 6075static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6076 void __user *buffer, size_t *lenp,
6077 loff_t *ppos)
6078{
6079 int ret = 0;
c6dbf7aa 6080 u32 new_val;
d35a00b8
FJ		 6081 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6082 struct net *net = (struct net *)ctl->extra2;
c6dbf7aa
SD		 6083 struct ctl_table tmp = {
6084 .data = &new_val,
6085 .maxlen = sizeof(new_val),
6086 .mode = ctl->mode,
6087 };
d35a00b8 6088
8c171d6c
FJ		 6089 if (!rtnl_trylock())
6090 return restart_syscall();
6091
c6dbf7aa 6092 new_val = *((u32 *)ctl->data);
d35a00b8 6093
c6dbf7aa
SD		 6094 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6095 if (ret != 0)
6096 goto out;
d35a00b8 6097
c6dbf7aa 6098 if (write) {
8c171d6c
FJ		 6099 if (check_addr_gen_mode(new_val) < 0) {
6100 ret = -EINVAL;
6101 goto out;
6102 }
d35a00b8 6103
c6dbf7aa 6104 if (idev) {
8c171d6c
FJ		 6105 if (check_stable_privacy(idev, net, new_val) < 0) {
6106 ret = -EINVAL;
6107 goto out;
6108 }
d35a00b8
FJ		 6109
6110 if (idev->cnf.addr_gen_mode != new_val) {
6111 idev->cnf.addr_gen_mode = new_val;
d35a00b8 6112 addrconf_dev_config(idev->dev);
d35a00b8 6113 }
f24c5987
SD		 6114 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6115 struct net_device *dev;
6116
6117 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6118 for_each_netdev(net, dev) {
6119 idev = __in6_dev_get(dev);
6120 if (idev &&
6121 idev->cnf.addr_gen_mode != new_val) {
6122 idev->cnf.addr_gen_mode = new_val;
6123 addrconf_dev_config(idev->dev);
6124 }
6125 }
d35a00b8 6126 }
c6dbf7aa
SD		 6127
6128 *((u32 *)ctl->data) = new_val;
d35a00b8
FJ		 6129 }
6130
8c171d6c
FJ		 6131out:
6132 rtnl_unlock();
6133
d35a00b8
FJ		 6134 return ret;
6135}
6136
3d1bec99
HFS		 6137static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6138 void __user *buffer, size_t *lenp,
6139 loff_t *ppos)
6140{
6141 int err;
6142 struct in6_addr addr;
6143 char str[IPV6_MAX_STRLEN];
6144 struct ctl_table lctl = *ctl;
622c81d5 6145 struct net *net = ctl->extra2;
3d1bec99
HFS		 6146 struct ipv6_stable_secret *secret = ctl->data;
6147
622c81d5
HFS		 6148 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6149 return -EIO;
6150
3d1bec99
HFS		 6151 lctl.maxlen = IPV6_MAX_STRLEN;
6152 lctl.data = str;
6153
6154 if (!rtnl_trylock())
6155 return restart_syscall();
6156
6157 if (!write && !secret->initialized) {
6158 err = -EIO;
6159 goto out;
6160 }
6161
5449a5ca
WC		 6162 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6163 if (err >= sizeof(str)) {
6164 err = -EIO;
6165 goto out;
3d1bec99
HFS		 6166 }
6167
6168 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6169 if (err || !write)
6170 goto out;
6171
6172 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6173 err = -EIO;
6174 goto out;
6175 }
6176
6177 secret->initialized = true;
6178 secret->secret = addr;
6179
622c81d5
HFS		 6180 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6181 struct net_device *dev;
6182
6183 for_each_netdev(net, dev) {
6184 struct inet6_dev *idev = __in6_dev_get(dev);
6185
6186 if (idev) {
d35a00b8 6187 idev->cnf.addr_gen_mode =
622c81d5
HFS		 6188 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6189 }
6190 }
6191 } else {
6192 struct inet6_dev *idev = ctl->extra1;
6193
d35a00b8 6194 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
622c81d5
HFS		 6195 }
6196
3d1bec99
HFS		 6197out:
6198 rtnl_unlock();
6199
6200 return err;
6201}
c92d5491 6202
35103d11
AG		 6203static
6204int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6205 int write,
6206 void __user *buffer,
6207 size_t *lenp,
6208 loff_t *ppos)
6209{
6210 int *valp = ctl->data;
6211 int val = *valp;
6212 loff_t pos = *ppos;
6213 struct ctl_table lctl;
6214 int ret;
6215
6216 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6217 * we should not modify it until we get the rtnl lock.
6218 */
6219 lctl = *ctl;
6220 lctl.data = &val;
6221
6222 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6223
6224 if (write)
6225 ret = addrconf_fixup_linkdown(ctl, valp, val);
6226 if (ret)
6227 *ppos = pos;
6228 return ret;
6229}
6230
df789fe7
DF		 6231static
6232void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6233{
6234 if (rt) {
6235 if (action)
6236 rt->dst.flags |= DST_NOPOLICY;
6237 else
6238 rt->dst.flags &= ~DST_NOPOLICY;
6239 }
6240}
6241
6242static
6243void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6244{
6245 struct inet6_ifaddr *ifa;
6246
6247 read_lock_bh(&idev->lock);
6248 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6249 spin_lock(&ifa->lock);
6250 if (ifa->rt) {
8d1c802b 6251 struct fib6_info *rt = ifa->rt;
df789fe7
DF		 6252 int cpu;
6253
66f5d6ce 6254 rcu_read_lock();
3b6761d1 6255 ifa->rt->dst_nopolicy = val ? true : false;
df789fe7
DF		 6256 if (rt->rt6i_pcpu) {
6257 for_each_possible_cpu(cpu) {
6258 struct rt6_info **rtp;
6259
6260 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
6261 addrconf_set_nopolicy(*rtp, val);
6262 }
6263 }
66f5d6ce 6264 rcu_read_unlock();
df789fe7
DF		 6265 }
6266 spin_unlock(&ifa->lock);
6267 }
6268 read_unlock_bh(&idev->lock);
6269}
6270
6271static
6272int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6273{
6274 struct inet6_dev *idev;
6275 struct net *net;
6276
6277 if (!rtnl_trylock())
6278 return restart_syscall();
6279
6280 *valp = val;
6281
6282 net = (struct net *)ctl->extra2;
6283 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6284 rtnl_unlock();
6285 return 0;
6286 }
6287
6288 if (valp == &net->ipv6.devconf_all->disable_policy) {
6289 struct net_device *dev;
6290
6291 for_each_netdev(net, dev) {
6292 idev = __in6_dev_get(dev);
6293 if (idev)
6294 addrconf_disable_policy_idev(idev, val);
6295 }
6296 } else {
6297 idev = (struct inet6_dev *)ctl->extra1;
6298 addrconf_disable_policy_idev(idev, val);
6299 }
6300
6301 rtnl_unlock();
6302 return 0;
6303}
6304
6305static
6306int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6307 void __user *buffer, size_t *lenp,
6308 loff_t *ppos)
6309{
6310 int *valp = ctl->data;
6311 int val = *valp;
6312 loff_t pos = *ppos;
6313 struct ctl_table lctl;
6314 int ret;
6315
6316 lctl = *ctl;
6317 lctl.data = &val;
6318 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6319
6320 if (write && (*valp != val))
6321 ret = addrconf_disable_policy(ctl, valp, val);
6322
6323 if (ret)
6324 *ppos = pos;
6325
6326 return ret;
6327}
6328
cb4a4c69 6329static int minus_one = -1;
2210d6b2 6330static const int zero = 0;
cb9e684e
MŻ		 6331static const int one = 1;
6332static const int two_five_five = 255;
6333
607ea7cd 6334static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 6335 {
6336 .procname = "forwarding",
6337 .data = &ipv6_devconf.forwarding,
6338 .maxlen = sizeof(int),
6339 .mode = 0644,
6340 .proc_handler = addrconf_sysctl_forward,
6341 },
6342 {
6343 .procname = "hop_limit",
6344 .data = &ipv6_devconf.hop_limit,
6345 .maxlen = sizeof(int),
6346 .mode = 0644,
cb9e684e
MŻ		 6347 .proc_handler = proc_dointvec_minmax,
6348 .extra1 = (void *)&one,
6349 .extra2 = (void *)&two_five_five,
5df1f77f
KK		 6350 },
6351 {
6352 .procname = "mtu",
6353 .data = &ipv6_devconf.mtu6,
6354 .maxlen = sizeof(int),
6355 .mode = 0644,
6356 .proc_handler = addrconf_sysctl_mtu,
6357 },
6358 {
6359 .procname = "accept_ra",
6360 .data = &ipv6_devconf.accept_ra,
6361 .maxlen = sizeof(int),
6362 .mode = 0644,
6363 .proc_handler = proc_dointvec,
6364 },
6365 {
6366 .procname = "accept_redirects",
6367 .data = &ipv6_devconf.accept_redirects,
6368 .maxlen = sizeof(int),
6369 .mode = 0644,
6370 .proc_handler = proc_dointvec,
6371 },
6372 {
6373 .procname = "autoconf",
6374 .data = &ipv6_devconf.autoconf,
6375 .maxlen = sizeof(int),
6376 .mode = 0644,
6377 .proc_handler = proc_dointvec,
6378 },
6379 {
6380 .procname = "dad_transmits",
6381 .data = &ipv6_devconf.dad_transmits,
6382 .maxlen = sizeof(int),
6383 .mode = 0644,
6384 .proc_handler = proc_dointvec,
6385 },
6386 {
6387 .procname = "router_solicitations",
6388 .data = &ipv6_devconf.rtr_solicits,
6389 .maxlen = sizeof(int),
6390 .mode = 0644,
cb4a4c69
MŻ		 6391 .proc_handler = proc_dointvec_minmax,
6392 .extra1 = &minus_one,
5df1f77f
KK		 6393 },
6394 {
6395 .procname = "router_solicitation_interval",
6396 .data = &ipv6_devconf.rtr_solicit_interval,
6397 .maxlen = sizeof(int),
6398 .mode = 0644,
6399 .proc_handler = proc_dointvec_jiffies,
6400 },
bd11f074
MŻ		 6401 {
6402 .procname = "router_solicitation_max_interval",
6403 .data = &ipv6_devconf.rtr_solicit_max_interval,
6404 .maxlen = sizeof(int),
6405 .mode = 0644,
6406 .proc_handler = proc_dointvec_jiffies,
6407 },
5df1f77f
KK		 6408 {
6409 .procname = "router_solicitation_delay",
6410 .data = &ipv6_devconf.rtr_solicit_delay,
6411 .maxlen = sizeof(int),
6412 .mode = 0644,
6413 .proc_handler = proc_dointvec_jiffies,
6414 },
6415 {
6416 .procname = "force_mld_version",
6417 .data = &ipv6_devconf.force_mld_version,
6418 .maxlen = sizeof(int),
6419 .mode = 0644,
6420 .proc_handler = proc_dointvec,
6421 },
6422 {
6423 .procname = "mldv1_unsolicited_report_interval",
6424 .data =
6425 &ipv6_devconf.mldv1_unsolicited_report_interval,
6426 .maxlen = sizeof(int),
6427 .mode = 0644,
6428 .proc_handler = proc_dointvec_ms_jiffies,
6429 },
6430 {
6431 .procname = "mldv2_unsolicited_report_interval",
6432 .data =
6433 &ipv6_devconf.mldv2_unsolicited_report_interval,
6434 .maxlen = sizeof(int),
6435 .mode = 0644,
6436 .proc_handler = proc_dointvec_ms_jiffies,
6437 },
6438 {
6439 .procname = "use_tempaddr",
6440 .data = &ipv6_devconf.use_tempaddr,
6441 .maxlen = sizeof(int),
6442 .mode = 0644,
6443 .proc_handler = proc_dointvec,
6444 },
6445 {
6446 .procname = "temp_valid_lft",
6447 .data = &ipv6_devconf.temp_valid_lft,
6448 .maxlen = sizeof(int),
6449 .mode = 0644,
6450 .proc_handler = proc_dointvec,
6451 },
6452 {
6453 .procname = "temp_prefered_lft",
6454 .data = &ipv6_devconf.temp_prefered_lft,
6455 .maxlen = sizeof(int),
6456 .mode = 0644,
6457 .proc_handler = proc_dointvec,
6458 },
6459 {
6460 .procname = "regen_max_retry",
6461 .data = &ipv6_devconf.regen_max_retry,
6462 .maxlen = sizeof(int),
6463 .mode = 0644,
6464 .proc_handler = proc_dointvec,
6465 },
6466 {
6467 .procname = "max_desync_factor",
6468 .data = &ipv6_devconf.max_desync_factor,
6469 .maxlen = sizeof(int),
6470 .mode = 0644,
6471 .proc_handler = proc_dointvec,
6472 },
6473 {
6474 .procname = "max_addresses",
6475 .data = &ipv6_devconf.max_addresses,
6476 .maxlen = sizeof(int),
6477 .mode = 0644,
6478 .proc_handler = proc_dointvec,
6479 },
6480 {
6481 .procname = "accept_ra_defrtr",
6482 .data = &ipv6_devconf.accept_ra_defrtr,
6483 .maxlen = sizeof(int),
6484 .mode = 0644,
6485 .proc_handler = proc_dointvec,
6486 },
6487 {
6488 .procname = "accept_ra_min_hop_limit",
6489 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6490 .maxlen = sizeof(int),
6491 .mode = 0644,
6492 .proc_handler = proc_dointvec,
6493 },
6494 {
6495 .procname = "accept_ra_pinfo",
6496 .data = &ipv6_devconf.accept_ra_pinfo,
6497 .maxlen = sizeof(int),
6498 .mode = 0644,
6499 .proc_handler = proc_dointvec,
6500 },
930d6ff2 6501#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 6502 {
6503 .procname = "accept_ra_rtr_pref",
6504 .data = &ipv6_devconf.accept_ra_rtr_pref,
6505 .maxlen = sizeof(int),
6506 .mode = 0644,
6507 .proc_handler = proc_dointvec,
6508 },
6509 {
6510 .procname = "router_probe_interval",
6511 .data = &ipv6_devconf.rtr_probe_interval,
6512 .maxlen = sizeof(int),
6513 .mode = 0644,
6514 .proc_handler = proc_dointvec_jiffies,
6515 },
fa03ef38 6516#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b
JS		 6517 {
6518 .procname = "accept_ra_rt_info_min_plen",
6519 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6520 .maxlen = sizeof(int),
6521 .mode = 0644,
6522 .proc_handler = proc_dointvec,
6523 },
5df1f77f
KK		 6524 {
6525 .procname = "accept_ra_rt_info_max_plen",
6526 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6527 .maxlen = sizeof(int),
6528 .mode = 0644,
6529 .proc_handler = proc_dointvec,
6530 },
09c884d4 6531#endif
930d6ff2 6532#endif
5df1f77f
KK		 6533 {
6534 .procname = "proxy_ndp",
6535 .data = &ipv6_devconf.proxy_ndp,
6536 .maxlen = sizeof(int),
6537 .mode = 0644,
6538 .proc_handler = addrconf_sysctl_proxy_ndp,
6539 },
6540 {
6541 .procname = "accept_source_route",
6542 .data = &ipv6_devconf.accept_source_route,
6543 .maxlen = sizeof(int),
6544 .mode = 0644,
6545 .proc_handler = proc_dointvec,
6546 },
95c385b4 6547#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 6548 {
6549 .procname = "optimistic_dad",
6550 .data = &ipv6_devconf.optimistic_dad,
6551 .maxlen = sizeof(int),
6552 .mode = 0644,
6553 .proc_handler = proc_dointvec,
6554 },
6555 {
6556 .procname = "use_optimistic",
6557 .data = &ipv6_devconf.use_optimistic,
6558 .maxlen = sizeof(int),
6559 .mode = 0644,
6560 .proc_handler = proc_dointvec,
6561 },
7bc570c8
YH		 6562#endif
6563#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 6564 {
6565 .procname = "mc_forwarding",
6566 .data = &ipv6_devconf.mc_forwarding,
6567 .maxlen = sizeof(int),
6568 .mode = 0444,
6569 .proc_handler = proc_dointvec,
6570 },
95c385b4 6571#endif
5df1f77f
KK		 6572 {
6573 .procname = "disable_ipv6",
6574 .data = &ipv6_devconf.disable_ipv6,
6575 .maxlen = sizeof(int),
6576 .mode = 0644,
6577 .proc_handler = addrconf_sysctl_disable,
6578 },
6579 {
6580 .procname = "accept_dad",
6581 .data = &ipv6_devconf.accept_dad,
6582 .maxlen = sizeof(int),
6583 .mode = 0644,
6584 .proc_handler = proc_dointvec,
6585 },
6586 {
6587 .procname = "force_tllao",
6588 .data = &ipv6_devconf.force_tllao,
6589 .maxlen = sizeof(int),
6590 .mode = 0644,
6591 .proc_handler = proc_dointvec
6592 },
6593 {
6594 .procname = "ndisc_notify",
6595 .data = &ipv6_devconf.ndisc_notify,
6596 .maxlen = sizeof(int),
6597 .mode = 0644,
6598 .proc_handler = proc_dointvec
6599 },
6600 {
6601 .procname = "suppress_frag_ndisc",
6602 .data = &ipv6_devconf.suppress_frag_ndisc,
6603 .maxlen = sizeof(int),
6604 .mode = 0644,
6605 .proc_handler = proc_dointvec
6606 },
6607 {
6608 .procname = "accept_ra_from_local",
6609 .data = &ipv6_devconf.accept_ra_from_local,
6610 .maxlen = sizeof(int),
6611 .mode = 0644,
6612 .proc_handler = proc_dointvec,
6613 },
6614 {
6615 .procname = "accept_ra_mtu",
6616 .data = &ipv6_devconf.accept_ra_mtu,
6617 .maxlen = sizeof(int),
6618 .mode = 0644,
6619 .proc_handler = proc_dointvec,
6620 },
6621 {
6622 .procname = "stable_secret",
6623 .data = &ipv6_devconf.stable_secret,
6624 .maxlen = IPV6_MAX_STRLEN,
6625 .mode = 0600,
6626 .proc_handler = addrconf_sysctl_stable_secret,
6627 },
6628 {
6629 .procname = "use_oif_addrs_only",
6630 .data = &ipv6_devconf.use_oif_addrs_only,
6631 .maxlen = sizeof(int),
6632 .mode = 0644,
6633 .proc_handler = proc_dointvec,
6634 },
6635 {
6636 .procname = "ignore_routes_with_linkdown",
6637 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6638 .maxlen = sizeof(int),
6639 .mode = 0644,
6640 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6641 },
6642 {
6643 .procname = "drop_unicast_in_l2_multicast",
6644 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6645 .maxlen = sizeof(int),
6646 .mode = 0644,
6647 .proc_handler = proc_dointvec,
6648 },
6649 {
6650 .procname = "drop_unsolicited_na",
6651 .data = &ipv6_devconf.drop_unsolicited_na,
6652 .maxlen = sizeof(int),
6653 .mode = 0644,
6654 .proc_handler = proc_dointvec,
6655 },
6656 {
6657 .procname = "keep_addr_on_down",
6658 .data = &ipv6_devconf.keep_addr_on_down,
6659 .maxlen = sizeof(int),
6660 .mode = 0644,
6661 .proc_handler = proc_dointvec,
6662
6663 },
1ababeba
DL		 6664 {
6665 .procname = "seg6_enabled",
6666 .data = &ipv6_devconf.seg6_enabled,
6667 .maxlen = sizeof(int),
6668 .mode = 0644,
6669 .proc_handler = proc_dointvec,
6670 },
bf355b8d
DL		 6671#ifdef CONFIG_IPV6_SEG6_HMAC
6672 {
6673 .procname = "seg6_require_hmac",
6674 .data = &ipv6_devconf.seg6_require_hmac,
6675 .maxlen = sizeof(int),
6676 .mode = 0644,
6677 .proc_handler = proc_dointvec,
6678 },
6679#endif
adc176c5
EN		 6680 {
6681 .procname = "enhanced_dad",
6682 .data = &ipv6_devconf.enhanced_dad,
6683 .maxlen = sizeof(int),
6684 .mode = 0644,
6685 .proc_handler = proc_dointvec,
6686 },
d35a00b8
FJ		 6687 {
6688 .procname = "addr_gen_mode",
6689 .data = &ipv6_devconf.addr_gen_mode,
6690 .maxlen = sizeof(int),
6691 .mode = 0644,
6692 .proc_handler = addrconf_sysctl_addr_gen_mode,
6693 },
df789fe7
DF		 6694 {
6695 .procname = "disable_policy",
6696 .data = &ipv6_devconf.disable_policy,
6697 .maxlen = sizeof(int),
6698 .mode = 0644,
6699 .proc_handler = addrconf_sysctl_disable_policy,
6700 },
2210d6b2
MŻ		 6701 {
6702 .procname = "ndisc_tclass",
6703 .data = &ipv6_devconf.ndisc_tclass,
6704 .maxlen = sizeof(int),
6705 .mode = 0644,
6706 .proc_handler = proc_dointvec_minmax,
6707 .extra1 = (void *)&zero,
6708 .extra2 = (void *)&two_five_five,
6709 },
5df1f77f
KK		 6710 {
6711 /* sentinel */
6712 }
1da177e4
LT		 6713};
6714
bff16c2f 6715static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 6716 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4 6717{
29c994e3 6718 int i, ifindex;
607ea7cd 6719 struct ctl_table *table;
6105e293 6720 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 6721
607ea7cd
KK		 6722 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6723 if (!table)
f68635e6
PE		 6724 goto out;
6725
607ea7cd
KK		 6726 for (i = 0; table[i].data; i++) {
6727 table[i].data += (char *)p - (char *)&ipv6_devconf;
cb9e684e
MŻ		 6728 /* If one of these is already set, then it is not safe to
6729 * overwrite either of them: this makes proc_dointvec_minmax
6730 * usable.
6731 */
6732 if (!table[i].extra1 && !table[i].extra2) {
6733 table[i].extra1 = idev; /* embedded; no ref */
6734 table[i].extra2 = net;
6735 }
1da177e4 6736 }
1da177e4 6737
6105e293 6738 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 6739
607ea7cd
KK		 6740 p->sysctl_header = register_net_sysctl(net, path, table);
6741 if (!p->sysctl_header)
6105e293 6742 goto free;
f68635e6 6743
29c994e3
ND		 6744 if (!strcmp(dev_name, "all"))
6745 ifindex = NETCONFA_IFINDEX_ALL;
6746 else if (!strcmp(dev_name, "default"))
6747 ifindex = NETCONFA_IFINDEX_DEFAULT;
6748 else
6749 ifindex = idev->dev->ifindex;
85b3daad
DA		 6750 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6751 ifindex, p);
95897312 6752 return 0;
1da177e4 6753
f68635e6 6754free:
607ea7cd 6755 kfree(table);
f68635e6 6756out:
95897312 6757 return -ENOBUFS;
1da177e4
LT		 6758}
6759
23452170
DA		 6760static void __addrconf_sysctl_unregister(struct net *net,
6761 struct ipv6_devconf *p, int ifindex)
408c4768 6762{
607ea7cd 6763 struct ctl_table *table;
408c4768 6764
607ea7cd 6765 if (!p->sysctl_header)
408c4768
PE		 6766 return;
6767
607ea7cd
KK		 6768 table = p->sysctl_header->ctl_table_arg;
6769 unregister_net_sysctl_table(p->sysctl_header);
6770 p->sysctl_header = NULL;
6771 kfree(table);
23452170
DA		 6772
6773 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
408c4768
PE		 6774}
6775
a317a2f1 6776static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 6777{
a317a2f1
WC		 6778 int err;
6779
6780 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6781 return -EINVAL;
6782
6783 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6784 &ndisc_ifinfo_sysctl_change);
6785 if (err)
6786 return err;
6787 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6788 idev, &idev->cnf);
6789 if (err)
6790 neigh_sysctl_unregister(idev->nd_parms);
6791
6792 return err;
f52295a9
PE		 6793}
6794
408c4768 6795static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 6796{
23452170
DA		 6797 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6798 idev->dev->ifindex);
408c4768 6799 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 6800}
6801
6802
6803#endif
6804
2c8c1e72 6805static int __net_init addrconf_init_net(struct net *net)
e0da5a48 6806{
a79ca223 6807 int err = -ENOMEM;
e0da5a48
PE		 6808 struct ipv6_devconf *all, *dflt;
6809
a79ca223 6810 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 6811 if (!all)
a79ca223 6812 goto err_alloc_all;
e0da5a48 6813
a79ca223 6814 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 6815 if (!dflt)
a79ca223 6816 goto err_alloc_dflt;
e0da5a48 6817
a79ca223
HZ		 6818 /* these will be inherited by all namespaces */
6819 dflt->autoconf = ipv6_defaults.autoconf;
6820 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 6821
3d1bec99
HFS		 6822 dflt->stable_secret.initialized = false;
6823 all->stable_secret.initialized = false;
6824
e0da5a48
PE		 6825 net->ipv6.devconf_all = all;
6826 net->ipv6.devconf_dflt = dflt;
6827
6828#ifdef CONFIG_SYSCTL
f8572d8f 6829 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 6830 if (err < 0)
6831 goto err_reg_all;
6832
f8572d8f 6833 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 6834 if (err < 0)
6835 goto err_reg_dflt;
6836#endif
6837 return 0;
6838
6839#ifdef CONFIG_SYSCTL
6840err_reg_dflt:
23452170 6841 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
e0da5a48
PE		 6842err_reg_all:
6843 kfree(dflt);
6844#endif
6845err_alloc_dflt:
6846 kfree(all);
6847err_alloc_all:
6848 return err;
6849}
6850
2c8c1e72 6851static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 6852{
6853#ifdef CONFIG_SYSCTL
23452170
DA		 6854 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6855 NETCONFA_IFINDEX_DEFAULT);
6856 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6857 NETCONFA_IFINDEX_ALL);
e0da5a48 6858#endif
73cf0e92 6859 kfree(net->ipv6.devconf_dflt);
6860 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 6861}
6862
6863static struct pernet_operations addrconf_ops = {
6864 .init = addrconf_init_net,
6865 .exit = addrconf_exit_net,
6866};
6867
207895fd 6868static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 6869 .family = AF_INET6,
6870 .fill_link_af = inet6_fill_link_af,
6871 .get_link_af_size = inet6_get_link_af_size,
11b1f828 6872 .validate_link_af = inet6_validate_link_af,
f53adae4 6873 .set_link_af = inet6_set_link_af,
b382b191
TG		 6874};
6875
1da177e4
LT		 6876/*
6877 * Init / cleanup code
6878 */
6879
6880int __init addrconf_init(void)
6881{
a317a2f1 6882 struct inet6_dev *idev;
c2e21293 6883 int i, err;
2a8cc6c8 6884
e21e8467
SH		 6885 err = ipv6_addr_label_init();
6886 if (err < 0) {
f3213831
JP		 6887 pr_crit("%s: cannot initialize default policy table: %d\n",
6888 __func__, err);
2cc6d2bf 6889 goto out;
2a8cc6c8 6890 }
1da177e4 6891
2cc6d2bf
NH		 6892 err = register_pernet_subsys(&addrconf_ops);
6893 if (err < 0)
6894 goto out_addrlabel;
e0da5a48 6895
c15b1cca
HFS		 6896 addrconf_wq = create_workqueue("ipv6_addrconf");
6897 if (!addrconf_wq) {
6898 err = -ENOMEM;
6899 goto out_nowq;
6900 }
6901
1da177e4
LT		 6902 /* The addrconf netdev notifier requires that loopback_dev
6903 * has it's ipv6 private information allocated and setup
6904 * before it can bring up and give link-local addresses
6905 * to other devices which are up.
6906 *
6907 * Unfortunately, loopback_dev is not necessarily the first
6908 * entry in the global dev_base list of net devices. In fact,
6909 * it is likely to be the very last entry on that list.
6910 * So this causes the notifier registry below to try and
6911 * give link-local addresses to all devices besides loopback_dev
6912 * first, then loopback_dev, which cases all the non-loopback_dev
6913 * devices to fail to get a link-local address.
6914 *
6915 * So, as a temporary fix, allocate the ipv6 structure for
6916 * loopback_dev first by hand.
6917 * Longer term, all of the dependencies ipv6 has upon the loopback
6918 * device and it being up should be removed.
6919 */
6920 rtnl_lock();
a317a2f1 6921 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 6922 rtnl_unlock();
a317a2f1
WC		 6923 if (IS_ERR(idev)) {
6924 err = PTR_ERR(idev);
e0da5a48 6925 goto errlo;
a317a2f1 6926 }
1da177e4 6927
2f460933
WC		 6928 ip6_route_init_special_entries();
6929
c2e21293 6930 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6931 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6932
1da177e4
LT		 6933 register_netdevice_notifier(&ipv6_dev_notf);
6934
c15b1cca 6935 addrconf_verify();
c127ea2c 6936
3678a9d8 6937 rtnl_af_register(&inet6_ops);
b382b191 6938
16feebcf
FW		 6939 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
6940 NULL, inet6_dump_ifinfo, 0);
c127ea2c
TG		 6941 if (err < 0)
6942 goto errout;
6943
16feebcf
FW		 6944 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
6945 inet6_rtm_newaddr, NULL, 0);
6946 if (err < 0)
6947 goto errout;
6948 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
6949 inet6_rtm_deladdr, NULL, 0);
6950 if (err < 0)
6951 goto errout;
6952 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
6953 inet6_rtm_getaddr, inet6_dump_ifaddr,
6954 RTNL_FLAG_DOIT_UNLOCKED);
6955 if (err < 0)
6956 goto errout;
6957 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
6958 NULL, inet6_dump_ifmcaddr, 0);
6959 if (err < 0)
6960 goto errout;
6961 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
6962 NULL, inet6_dump_ifacaddr, 0);
6963 if (err < 0)
6964 goto errout;
6965 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
6966 inet6_netconf_get_devconf,
6967 inet6_netconf_dump_devconf,
6968 RTNL_FLAG_DOIT_UNLOCKED);
6969 if (err < 0)
6970 goto errout;
a3fde2ad
FW		 6971 err = ipv6_addr_label_rtnl_register();
6972 if (err < 0)
6973 goto errout;
2a8cc6c8 6974
1da177e4 6975 return 0;
c127ea2c 6976errout:
16feebcf 6977 rtnl_unregister_all(PF_INET6);
b382b191 6978 rtnl_af_unregister(&inet6_ops);
c127ea2c 6979 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6980errlo:
c15b1cca
HFS		 6981 destroy_workqueue(addrconf_wq);
6982out_nowq:
e0da5a48 6983 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 6984out_addrlabel:
6985 ipv6_addr_label_cleanup();
6986out:
c127ea2c 6987 return err;
1da177e4
LT		 6988}
6989
09f7709f 6990void addrconf_cleanup(void)
1da177e4 6991{
176c39af 6992 struct net_device *dev;
1da177e4
LT		 6993 int i;
6994
6995 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6996 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 6997 ipv6_addr_label_cleanup();
1da177e4 6998
5c45121d 6999 rtnl_af_unregister(&inet6_ops);
1da177e4 7000
5c45121d 7001 rtnl_lock();
b382b191 7002
176c39af
DL		 7003 /* clean dev list */
7004 for_each_netdev(&init_net, dev) {
7005 if (__in6_dev_get(dev) == NULL)
7006 continue;
7007 addrconf_ifdown(dev, 1);
7008 }
7009 addrconf_ifdown(init_net.loopback_dev, 2);
7010
1da177e4
LT		 7011 /*
7012 * Check hash table.
7013 */
5c578aed 7014 spin_lock_bh(&addrconf_hash_lock);
c2e21293 7015 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7016 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 7017 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 7018 cancel_delayed_work(&addr_chk_work);
1da177e4 7019 rtnl_unlock();
c15b1cca
HFS		 7020
7021 destroy_workqueue(addrconf_wq);
1da177e4 7022}
Linux 6.x block layer and io_uring tree(s)