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ipv6: Fix IPv6 packet loss in scenarios involving roaming + snooping switches
[mirror_ubuntu-zesty-kernel.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
1da177e4
LT		 46#include <linux/socket.h>
47#include <linux/sockios.h>
1da177e4 48#include <linux/net.h>
3d1bec99 49#include <linux/inet.h>
1da177e4
LT		 50#include <linux/in6.h>
51#include <linux/netdevice.h>
1823730f 52#include <linux/if_addr.h>
1da177e4
LT		 53#include <linux/if_arp.h>
54#include <linux/if_arcnet.h>
55#include <linux/if_infiniband.h>
56#include <linux/route.h>
57#include <linux/inetdevice.h>
58#include <linux/init.h>
5a0e3ad6 59#include <linux/slab.h>
1da177e4
LT		 60#ifdef CONFIG_SYSCTL
61#include <linux/sysctl.h>
62#endif
4fc268d2 63#include <linux/capability.h>
1da177e4
LT		 64#include <linux/delay.h>
65#include <linux/notifier.h>
543537bd 66#include <linux/string.h>
ddbe5032 67#include <linux/hash.h>
1da177e4 68
457c4cbc 69#include <net/net_namespace.h>
1da177e4
LT		 70#include <net/sock.h>
71#include <net/snmp.h>
72
5241c2d7 73#include <net/6lowpan.h>
cb6bf355 74#include <net/firewire.h>
1da177e4
LT		 75#include <net/ipv6.h>
76#include <net/protocol.h>
77#include <net/ndisc.h>
78#include <net/ip6_route.h>
79#include <net/addrconf.h>
80#include <net/tcp.h>
81#include <net/ip.h>
5d620266 82#include <net/netlink.h>
f24e3d65 83#include <net/pkt_sched.h>
ca254490 84#include <net/l3mdev.h>
1da177e4
LT		 85#include <linux/if_tunnel.h>
86#include <linux/rtnetlink.h>
f3a1bfb1 87#include <linux/netconf.h>
1da177e4 88#include <linux/random.h>
e21e8467 89#include <linux/uaccess.h>
7f7d9a6b 90#include <asm/unaligned.h>
1da177e4
LT		 91
92#include <linux/proc_fs.h>
93#include <linux/seq_file.h>
bc3b2d7f 94#include <linux/export.h>
1da177e4
LT		 95
96/* Set to 3 to get tracing... */
97#define ACONF_DEBUG 2
98
99#if ACONF_DEBUG >= 3
ba3542e1 100#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
1da177e4 101#else
ba3542e1 102#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
1da177e4
LT		 103#endif
104
105#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e 106
3d1bec99
HFS		 107#define IPV6_MAX_STRLEN \
108 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
109
18a31e1e
TG		 110static inline u32 cstamp_delta(unsigned long cstamp)
111{
112 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
113}
1da177e4 114
bd11f074
MŻ		 115static inline s32 rfc3315_s14_backoff_init(s32 irt)
116{
117 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
118 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
119 do_div(tmp, 1000000);
120 return (s32)tmp;
121}
122
123static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
124{
125 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
126 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
127 do_div(tmp, 1000000);
128 if ((s32)tmp > mrt) {
129 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
130 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
131 do_div(tmp, 1000000);
132 }
133 return (s32)tmp;
134}
135
1da177e4 136#ifdef CONFIG_SYSCTL
a317a2f1 137static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 138static void addrconf_sysctl_unregister(struct inet6_dev *idev);
139#else
a317a2f1 140static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 141{
a317a2f1 142 return 0;
408c4768
PE		 143}
144
145static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
146{
147}
1da177e4
LT		 148#endif
149
9d6280da
JB		 150static void ipv6_regen_rndid(struct inet6_dev *idev);
151static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 152
1b34be74 153static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4 154static int ipv6_count_addresses(struct inet6_dev *idev);
622c81d5
HFS		 155static int ipv6_generate_stable_address(struct in6_addr *addr,
156 u8 dad_count,
157 const struct inet6_dev *idev);
1da177e4
LT		 158
159/*
160 * Configured unicast address hash table
161 */
c2e21293 162static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 163static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 164
c15b1cca
HFS		 165static void addrconf_verify(void);
166static void addrconf_verify_rtnl(void);
167static void addrconf_verify_work(struct work_struct *);
1da177e4 168
c15b1cca
HFS		 169static struct workqueue_struct *addrconf_wq;
170static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 171
172static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
173static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
174
93d9b7d7
JP		 175static void addrconf_type_change(struct net_device *dev,
176 unsigned long event);
1da177e4
LT		 177static int addrconf_ifdown(struct net_device *dev, int how);
178
21caa662
RK		 179static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
180 int plen,
181 const struct net_device *dev,
182 u32 flags, u32 noflags);
183
cf22f9a2 184static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 185static void addrconf_dad_work(struct work_struct *w);
764d3be6 186static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id);
c5e33bdd 187static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 188static void addrconf_rs_timer(unsigned long data);
189static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
190static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
191
1ab1457c 192static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 193 struct prefix_info *pinfo);
3e81c6da
DM		 194static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
195 struct net_device *dev);
1da177e4 196
888c848e 197static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 198 .forwarding = 0,
199 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
200 .mtu6 = IPV6_MIN_MTU,
201 .accept_ra = 1,
202 .accept_redirects = 1,
203 .autoconf = 1,
204 .force_mld_version = 0,
fc4eba58
HFS		 205 .mldv1_unsolicited_report_interval = 10 * HZ,
206 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 207 .dad_transmits = 1,
208 .rtr_solicits = MAX_RTR_SOLICITATIONS,
209 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 210 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 211 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 212 .use_tempaddr = 0,
1da177e4
LT		 213 .temp_valid_lft = TEMP_VALID_LIFETIME,
214 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
215 .regen_max_retry = REGEN_MAX_RETRY,
216 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 217 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 218 .accept_ra_defrtr = 1,
d9333196 219 .accept_ra_from_local = 0,
8013d1d7 220 .accept_ra_min_hop_limit= 1,
c4fd30eb 221 .accept_ra_pinfo = 1,
930d6ff2
YH		 222#ifdef CONFIG_IPV6_ROUTER_PREF
223 .accept_ra_rtr_pref = 1,
52e16356 224 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 225#ifdef CONFIG_IPV6_ROUTE_INFO
226 .accept_ra_rt_info_max_plen = 0,
227#endif
930d6ff2 228#endif
fbea49e1 229 .proxy_ndp = 0,
0bcbc926 230 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 231 .disable_ipv6 = 0,
1b34be74 232 .accept_dad = 1,
b800c3b9 233 .suppress_frag_ndisc = 1,
c2943f14 234 .accept_ra_mtu = 1,
3d1bec99
HFS		 235 .stable_secret = {
236 .initialized = false,
3985e8a3
EK		 237 },
238 .use_oif_addrs_only = 0,
35103d11 239 .ignore_routes_with_linkdown = 0,
f1705ec1 240 .keep_addr_on_down = 0,
1ababeba 241 .seg6_enabled = 0,
bf355b8d
DL		 242#ifdef CONFIG_IPV6_SEG6_HMAC
243 .seg6_require_hmac = 0,
244#endif
adc176c5 245 .enhanced_dad = 1,
1da177e4
LT		 246};
247
ab32ea5d 248static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 249 .forwarding = 0,
250 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
251 .mtu6 = IPV6_MIN_MTU,
252 .accept_ra = 1,
253 .accept_redirects = 1,
254 .autoconf = 1,
fc4eba58
HFS		 255 .force_mld_version = 0,
256 .mldv1_unsolicited_report_interval = 10 * HZ,
257 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 258 .dad_transmits = 1,
259 .rtr_solicits = MAX_RTR_SOLICITATIONS,
260 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 261 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 262 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 263 .use_tempaddr = 0,
264 .temp_valid_lft = TEMP_VALID_LIFETIME,
265 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
266 .regen_max_retry = REGEN_MAX_RETRY,
267 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 268 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 269 .accept_ra_defrtr = 1,
d9333196 270 .accept_ra_from_local = 0,
8013d1d7 271 .accept_ra_min_hop_limit= 1,
c4fd30eb 272 .accept_ra_pinfo = 1,
930d6ff2
YH		 273#ifdef CONFIG_IPV6_ROUTER_PREF
274 .accept_ra_rtr_pref = 1,
52e16356 275 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 276#ifdef CONFIG_IPV6_ROUTE_INFO
277 .accept_ra_rt_info_max_plen = 0,
278#endif
930d6ff2 279#endif
fbea49e1 280 .proxy_ndp = 0,
0bcbc926 281 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 282 .disable_ipv6 = 0,
1b34be74 283 .accept_dad = 1,
b800c3b9 284 .suppress_frag_ndisc = 1,
c2943f14 285 .accept_ra_mtu = 1,
3d1bec99
HFS		 286 .stable_secret = {
287 .initialized = false,
288 },
3985e8a3 289 .use_oif_addrs_only = 0,
35103d11 290 .ignore_routes_with_linkdown = 0,
f1705ec1 291 .keep_addr_on_down = 0,
1ababeba 292 .seg6_enabled = 0,
bf355b8d
DL		 293#ifdef CONFIG_IPV6_SEG6_HMAC
294 .seg6_require_hmac = 0,
295#endif
adc176c5 296 .enhanced_dad = 1,
1da177e4
LT		 297};
298
f24e3d65 299/* Check if a valid qdisc is available */
05297949 300static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 301{
05297949 302 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 303}
304
b7b1bfce 305static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 306{
b7b1bfce
HFS		 307 if (del_timer(&idev->rs_timer))
308 __in6_dev_put(idev);
309}
310
c15b1cca 311static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 312{
c15b1cca 313 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 314 __in6_ifa_put(ifp);
315}
316
b7b1bfce
HFS		 317static void addrconf_mod_rs_timer(struct inet6_dev *idev,
318 unsigned long when)
319{
320 if (!timer_pending(&idev->rs_timer))
321 in6_dev_hold(idev);
322 mod_timer(&idev->rs_timer, jiffies + when);
323}
1da177e4 324
c15b1cca
HFS		 325static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
326 unsigned long delay)
1da177e4 327{
c15b1cca 328 if (!delayed_work_pending(&ifp->dad_work))
1da177e4 329 in6_ifa_hold(ifp);
c15b1cca 330 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
1da177e4
LT		 331}
332
7f7d9a6b
HX		 333static int snmp6_alloc_dev(struct inet6_dev *idev)
334{
827da44c
JS		 335 int i;
336
698365fa
WC		 337 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
338 if (!idev->stats.ipv6)
7f7d9a6b 339 goto err_ip;
827da44c
JS		 340
341 for_each_possible_cpu(i) {
342 struct ipstats_mib *addrconf_stats;
698365fa 343 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 344 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 345 }
346
347
be281e55
ED		 348 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
349 GFP_KERNEL);
350 if (!idev->stats.icmpv6dev)
7f7d9a6b 351 goto err_icmp;
be281e55
ED		 352 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
353 GFP_KERNEL);
354 if (!idev->stats.icmpv6msgdev)
14878f75 355 goto err_icmpmsg;
7f7d9a6b
HX		 356
357 return 0;
358
14878f75 359err_icmpmsg:
be281e55 360 kfree(idev->stats.icmpv6dev);
7f7d9a6b 361err_icmp:
698365fa 362 free_percpu(idev->stats.ipv6);
7f7d9a6b 363err_ip:
aaf70ec7 364 return -ENOMEM;
7f7d9a6b
HX		 365}
366
8e5e8f30 367static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 368{
369 struct inet6_dev *ndev;
a317a2f1 370 int err = -ENOMEM;
1da177e4
LT		 371
372 ASSERT_RTNL();
373
374 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 375 return ERR_PTR(-EINVAL);
1da177e4 376
1ab1457c 377 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
63159f29 378 if (!ndev)
a317a2f1 379 return ERR_PTR(err);
322f74a4
IO		 380
381 rwlock_init(&ndev->lock);
382 ndev->dev = dev;
502a2ffd 383 INIT_LIST_HEAD(&ndev->addr_list);
b7b1bfce
HFS		 384 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
385 (unsigned long)ndev);
c346dca1 386 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
9b29c696
HFS		 387
388 if (ndev->cnf.stable_secret.initialized)
389 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
390 else
391 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64;
392
322f74a4 393 ndev->cnf.mtu6 = dev->mtu;
322f74a4 394 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
63159f29 395 if (!ndev->nd_parms) {
322f74a4 396 kfree(ndev);
a317a2f1 397 return ERR_PTR(err);
322f74a4 398 }
0187bdfb
BH		 399 if (ndev->cnf.forwarding)
400 dev_disable_lro(dev);
322f74a4
IO		 401 /* We refer to the device */
402 dev_hold(dev);
1da177e4 403
322f74a4 404 if (snmp6_alloc_dev(ndev) < 0) {
ba3542e1 405 ADBG(KERN_WARNING
f3213831 406 "%s: cannot allocate memory for statistics; dev=%s.\n",
ba3542e1 407 __func__, dev->name);
322f74a4 408 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 409 dev_put(dev);
410 kfree(ndev);
a317a2f1 411 return ERR_PTR(err);
322f74a4 412 }
1da177e4 413
322f74a4 414 if (snmp6_register_dev(ndev) < 0) {
ba3542e1 415 ADBG(KERN_WARNING
f3213831 416 "%s: cannot create /proc/net/dev_snmp6/%s\n",
ba3542e1 417 __func__, dev->name);
a317a2f1 418 goto err_release;
322f74a4
IO		 419 }
420
9d6280da 421 /* One reference from device. */
322f74a4 422 in6_dev_hold(ndev);
1da177e4 423
1b34be74
YH		 424 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
425 ndev->cnf.accept_dad = -1;
426
07a93626 427#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 428 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 429 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 430 ndev->cnf.rtr_solicits = 0;
431 }
432#endif
433
372e6c8f 434 INIT_LIST_HEAD(&ndev->tempaddr_list);
76506a98 435 ndev->desync_factor = U32_MAX;
322f74a4
IO		 436 if ((dev->flags&IFF_LOOPBACK) ||
437 dev->type == ARPHRD_TUNNEL ||
9625ed72 438 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 439 dev->type == ARPHRD_SIT ||
0be669bb 440 dev->type == ARPHRD_NONE) {
322f74a4 441 ndev->cnf.use_tempaddr = -1;
9d6280da
JB		 442 } else
443 ipv6_regen_rndid(ndev);
5d9efa7e 444
914faa14 445 ndev->token = in6addr_any;
1da177e4 446
f24e3d65 447 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 448 ndev->if_flags |= IF_READY;
449
322f74a4
IO		 450 ipv6_mc_init_dev(ndev);
451 ndev->tstamp = jiffies;
a317a2f1
WC		 452 err = addrconf_sysctl_register(ndev);
453 if (err) {
454 ipv6_mc_destroy_dev(ndev);
2a189f9e 455 snmp6_unregister_dev(ndev);
a317a2f1
WC		 456 goto err_release;
457 }
30c4cf57 458 /* protected by rtnl_lock */
cf778b00 459 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 460
2c5e8933
HFS		 461 /* Join interface-local all-node multicast group */
462 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
463
d88ae4cc 464 /* Join all-node multicast group */
f3ee4010 465 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 466
d6ddef9e 467 /* Join all-router multicast group if forwarding is set */
8b2aaede 468 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 469 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
470
1da177e4 471 return ndev;
a317a2f1
WC		 472
473err_release:
474 neigh_parms_release(&nd_tbl, ndev->nd_parms);
475 ndev->dead = 1;
476 in6_dev_finish_destroy(ndev);
477 return ERR_PTR(err);
1da177e4
LT		 478}
479
8e5e8f30 480static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 481{
482 struct inet6_dev *idev;
483
484 ASSERT_RTNL();
485
e21e8467
SH		 486 idev = __in6_dev_get(dev);
487 if (!idev) {
488 idev = ipv6_add_dev(dev);
a317a2f1 489 if (IS_ERR(idev))
1da177e4
LT		 490 return NULL;
491 }
c5e33bdd 492
1da177e4
LT		 493 if (dev->flags&IFF_UP)
494 ipv6_mc_up(idev);
495 return idev;
496}
497
f3a1bfb1
ND		 498static int inet6_netconf_msgsize_devconf(int type)
499{
500 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
501 + nla_total_size(4); /* NETCONFA_IFINDEX */
136ba622 502 bool all = false;
f3a1bfb1 503
136ba622
ZS		 504 if (type == NETCONFA_ALL)
505 all = true;
506
507 if (all || type == NETCONFA_FORWARDING)
f3a1bfb1 508 size += nla_total_size(4);
b1afce95 509#ifdef CONFIG_IPV6_MROUTE
136ba622 510 if (all || type == NETCONFA_MC_FORWARDING)
d67b8c61 511 size += nla_total_size(4);
b1afce95 512#endif
136ba622 513 if (all || type == NETCONFA_PROXY_NEIGH)
c92d5491 514 size += nla_total_size(4);
f3a1bfb1 515
136ba622 516 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
35103d11
AG		 517 size += nla_total_size(4);
518
f3a1bfb1
ND		 519 return size;
520}
521
522static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
523 struct ipv6_devconf *devconf, u32 portid,
524 u32 seq, int event, unsigned int flags,
525 int type)
526{
527 struct nlmsghdr *nlh;
528 struct netconfmsg *ncm;
136ba622 529 bool all = false;
f3a1bfb1
ND		 530
531 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
532 flags);
63159f29 533 if (!nlh)
f3a1bfb1
ND		 534 return -EMSGSIZE;
535
136ba622
ZS		 536 if (type == NETCONFA_ALL)
537 all = true;
538
f3a1bfb1
ND		 539 ncm = nlmsg_data(nlh);
540 ncm->ncm_family = AF_INET6;
541
542 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
543 goto nla_put_failure;
544
136ba622 545 if ((all || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 546 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
547 goto nla_put_failure;
b1afce95 548#ifdef CONFIG_IPV6_MROUTE
136ba622 549 if ((all || type == NETCONFA_MC_FORWARDING) &&
d67b8c61
ND		 550 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
551 devconf->mc_forwarding) < 0)
552 goto nla_put_failure;
b1afce95 553#endif
136ba622 554 if ((all || type == NETCONFA_PROXY_NEIGH) &&
c92d5491 555 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
556 goto nla_put_failure;
557
136ba622 558 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
35103d11
AG		 559 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
560 devconf->ignore_routes_with_linkdown) < 0)
561 goto nla_put_failure;
562
053c095a
JB		 563 nlmsg_end(skb, nlh);
564 return 0;
f3a1bfb1
ND		 565
566nla_put_failure:
567 nlmsg_cancel(skb, nlh);
568 return -EMSGSIZE;
569}
570
d67b8c61
ND		 571void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
572 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 573{
574 struct sk_buff *skb;
575 int err = -ENOBUFS;
576
927265bc 577 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
63159f29 578 if (!skb)
f3a1bfb1
ND		 579 goto errout;
580
581 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
582 RTM_NEWNETCONF, 0, type);
583 if (err < 0) {
584 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
585 WARN_ON(err == -EMSGSIZE);
586 kfree_skb(skb);
587 goto errout;
588 }
927265bc 589 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
f3a1bfb1
ND		 590 return;
591errout:
bd779028 592 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 593}
594
76f8f6cb
ND		 595static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
596 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
597 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 598 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
35103d11 599 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
76f8f6cb
ND		 600};
601
602static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 603 struct nlmsghdr *nlh)
76f8f6cb
ND		 604{
605 struct net *net = sock_net(in_skb->sk);
606 struct nlattr *tb[NETCONFA_MAX+1];
607 struct netconfmsg *ncm;
608 struct sk_buff *skb;
609 struct ipv6_devconf *devconf;
610 struct inet6_dev *in6_dev;
611 struct net_device *dev;
612 int ifindex;
613 int err;
614
615 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
616 devconf_ipv6_policy);
617 if (err < 0)
618 goto errout;
619
a97eb33f 620 err = -EINVAL;
76f8f6cb
ND		 621 if (!tb[NETCONFA_IFINDEX])
622 goto errout;
623
624 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
625 switch (ifindex) {
626 case NETCONFA_IFINDEX_ALL:
627 devconf = net->ipv6.devconf_all;
628 break;
629 case NETCONFA_IFINDEX_DEFAULT:
630 devconf = net->ipv6.devconf_dflt;
631 break;
632 default:
633 dev = __dev_get_by_index(net, ifindex);
63159f29 634 if (!dev)
76f8f6cb
ND		 635 goto errout;
636 in6_dev = __in6_dev_get(dev);
63159f29 637 if (!in6_dev)
76f8f6cb
ND		 638 goto errout;
639 devconf = &in6_dev->cnf;
640 break;
641 }
642
643 err = -ENOBUFS;
136ba622 644 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
63159f29 645 if (!skb)
76f8f6cb
ND		 646 goto errout;
647
648 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
649 NETLINK_CB(in_skb).portid,
650 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
136ba622 651 NETCONFA_ALL);
76f8f6cb
ND		 652 if (err < 0) {
653 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
654 WARN_ON(err == -EMSGSIZE);
655 kfree_skb(skb);
656 goto errout;
657 }
658 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
659errout:
660 return err;
661}
662
7a674200
ND		 663static int inet6_netconf_dump_devconf(struct sk_buff *skb,
664 struct netlink_callback *cb)
665{
666 struct net *net = sock_net(skb->sk);
667 int h, s_h;
668 int idx, s_idx;
669 struct net_device *dev;
670 struct inet6_dev *idev;
671 struct hlist_head *head;
672
673 s_h = cb->args[0];
674 s_idx = idx = cb->args[1];
675
676 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
677 idx = 0;
678 head = &net->dev_index_head[h];
679 rcu_read_lock();
63998ac2
ND		 680 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
681 net->dev_base_seq;
7a674200
ND		 682 hlist_for_each_entry_rcu(dev, head, index_hlist) {
683 if (idx < s_idx)
684 goto cont;
685 idev = __in6_dev_get(dev);
686 if (!idev)
687 goto cont;
688
689 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
690 &idev->cnf,
691 NETLINK_CB(cb->skb).portid,
692 cb->nlh->nlmsg_seq,
693 RTM_NEWNETCONF,
694 NLM_F_MULTI,
136ba622 695 NETCONFA_ALL) < 0) {
7a674200
ND		 696 rcu_read_unlock();
697 goto done;
698 }
63998ac2 699 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 700cont:
701 idx++;
702 }
703 rcu_read_unlock();
704 }
705 if (h == NETDEV_HASHENTRIES) {
706 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
707 net->ipv6.devconf_all,
708 NETLINK_CB(cb->skb).portid,
709 cb->nlh->nlmsg_seq,
710 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 711 NETCONFA_ALL) < 0)
7a674200
ND		 712 goto done;
713 else
714 h++;
715 }
716 if (h == NETDEV_HASHENTRIES + 1) {
717 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
718 net->ipv6.devconf_dflt,
719 NETLINK_CB(cb->skb).portid,
720 cb->nlh->nlmsg_seq,
721 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 722 NETCONFA_ALL) < 0)
7a674200
ND		 723 goto done;
724 else
725 h++;
726 }
727done:
728 cb->args[0] = h;
729 cb->args[1] = idx;
730
731 return skb->len;
732}
733
1da177e4
LT		 734#ifdef CONFIG_SYSCTL
735static void dev_forward_change(struct inet6_dev *idev)
736{
737 struct net_device *dev;
738 struct inet6_ifaddr *ifa;
1da177e4
LT		 739
740 if (!idev)
741 return;
742 dev = idev->dev;
0187bdfb
BH		 743 if (idev->cnf.forwarding)
744 dev_disable_lro(dev);
1a940835 745 if (dev->flags & IFF_MULTICAST) {
2c5e8933 746 if (idev->cnf.forwarding) {
f3ee4010 747 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 748 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
749 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
750 } else {
f3ee4010 751 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 752 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
753 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
754 }
1da177e4 755 }
502a2ffd 756
757 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 758 if (ifa->flags&IFA_F_TENTATIVE)
759 continue;
1da177e4
LT		 760 if (idev->cnf.forwarding)
761 addrconf_join_anycast(ifa);
762 else
763 addrconf_leave_anycast(ifa);
764 }
f3a1bfb1
ND		 765 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
766 dev->ifindex, &idev->cnf);
1da177e4
LT		 767}
768
769
e186932b 770static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 771{
772 struct net_device *dev;
773 struct inet6_dev *idev;
774
4acd4945 775 for_each_netdev(net, dev) {
1da177e4
LT		 776 idev = __in6_dev_get(dev);
777 if (idev) {
e186932b
PE		 778 int changed = (!idev->cnf.forwarding) ^ (!newf);
779 idev->cnf.forwarding = newf;
1da177e4
LT		 780 if (changed)
781 dev_forward_change(idev);
782 }
1da177e4 783 }
1da177e4 784}
c8fecf22 785
013d97e9 786static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 787{
bff16c2f 788 struct net *net;
013d97e9
FR		 789 int old;
790
791 if (!rtnl_trylock())
792 return restart_syscall();
bff16c2f
PE		 793
794 net = (struct net *)table->extra2;
013d97e9
FR		 795 old = *p;
796 *p = newf;
b325fddb 797
013d97e9 798 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 799 if ((!newf) ^ (!old))
800 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
801 NETCONFA_IFINDEX_DEFAULT,
802 net->ipv6.devconf_dflt);
013d97e9
FR		 803 rtnl_unlock();
804 return 0;
88af182e 805 }
c8fecf22 806
e186932b 807 if (p == &net->ipv6.devconf_all->forwarding) {
d26c638c
ND		 808 int old_dflt = net->ipv6.devconf_dflt->forwarding;
809
e186932b 810 net->ipv6.devconf_dflt->forwarding = newf;
d26c638c
ND		 811 if ((!newf) ^ (!old_dflt))
812 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
813 NETCONFA_IFINDEX_DEFAULT,
814 net->ipv6.devconf_dflt);
815
e186932b 816 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 817 if ((!newf) ^ (!old))
818 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
819 NETCONFA_IFINDEX_ALL,
820 net->ipv6.devconf_all);
013d97e9 821 } else if ((!newf) ^ (!old))
c8fecf22 822 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 823 rtnl_unlock();
c8fecf22 824
013d97e9 825 if (newf)
7b4da532 826 rt6_purge_dflt_routers(net);
b325fddb 827 return 1;
c8fecf22 828}
35103d11
AG		 829
830static void addrconf_linkdown_change(struct net *net, __s32 newf)
831{
832 struct net_device *dev;
833 struct inet6_dev *idev;
834
835 for_each_netdev(net, dev) {
836 idev = __in6_dev_get(dev);
837 if (idev) {
838 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
839
840 idev->cnf.ignore_routes_with_linkdown = newf;
841 if (changed)
842 inet6_netconf_notify_devconf(dev_net(dev),
843 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
844 dev->ifindex,
845 &idev->cnf);
846 }
847 }
848}
849
850static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
851{
852 struct net *net;
853 int old;
854
855 if (!rtnl_trylock())
856 return restart_syscall();
857
858 net = (struct net *)table->extra2;
859 old = *p;
860 *p = newf;
861
862 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
863 if ((!newf) ^ (!old))
864 inet6_netconf_notify_devconf(net,
865 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
866 NETCONFA_IFINDEX_DEFAULT,
867 net->ipv6.devconf_dflt);
868 rtnl_unlock();
869 return 0;
870 }
871
872 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
873 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
874 addrconf_linkdown_change(net, newf);
875 if ((!newf) ^ (!old))
876 inet6_netconf_notify_devconf(net,
877 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
878 NETCONFA_IFINDEX_ALL,
879 net->ipv6.devconf_all);
880 }
881 rtnl_unlock();
882
883 return 1;
884}
885
1da177e4
LT		 886#endif
887
5c578aed 888/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 889void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
890{
c2e21293 891 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 892
1da177e4 893#ifdef NET_REFCNT_DEBUG
91df42be 894 pr_debug("%s\n", __func__);
1da177e4
LT		 895#endif
896
897 in6_dev_put(ifp->idev);
898
c15b1cca
HFS		 899 if (cancel_delayed_work(&ifp->dad_work))
900 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
901 ifp);
1da177e4 902
e9d3e084 903 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 904 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 905 return;
906 }
94e187c0 907 ip6_rt_put(ifp->rt);
1da177e4 908
e5785985 909 kfree_rcu(ifp, rcu);
1da177e4
LT		 910}
911
e55ffac6
BH		 912static void
913ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
914{
502a2ffd 915 struct list_head *p;
8a6ce0c0 916 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 917
918 /*
919 * Each device address list is sorted in order of scope -
920 * global before linklocal.
921 */
502a2ffd 922 list_for_each(p, &idev->addr_list) {
923 struct inet6_ifaddr *ifa
924 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 925 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 926 break;
927 }
928
b54c9b98 929 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 930}
931
ddbe5032 932static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 933{
ddbe5032 934 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 935}
936
1da177e4
LT		 937/* On success it returns ifp with increased reference count */
938
939static struct inet6_ifaddr *
3f8f5298
JP		 940ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
941 const struct in6_addr *peer_addr, int pfxlen,
8a226b2c 942 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
1da177e4
LT		 943{
944 struct inet6_ifaddr *ifa = NULL;
945 struct rt6_info *rt;
3a88a81d 946 unsigned int hash;
1da177e4 947 int err = 0;
d68b8270
YH		 948 int addr_type = ipv6_addr_type(addr);
949
950 if (addr_type == IPV6_ADDR_ANY ||
951 addr_type & IPV6_ADDR_MULTICAST ||
952 (!(idev->dev->flags & IFF_LOOPBACK) &&
953 addr_type & IPV6_ADDR_LOOPBACK))
954 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 955
8814c4b5 956 rcu_read_lock_bh();
1da177e4
LT		 957 if (idev->dead) {
958 err = -ENODEV; /*XXX*/
959 goto out2;
960 }
961
56d417b1 962 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 963 err = -EACCES;
964 goto out2;
965 }
966
5c578aed 967 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 968
969 /* Ignore adding duplicate addresses on an interface */
c346dca1 970 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ba3542e1 971 ADBG("ipv6_add_addr: already assigned\n");
1da177e4
LT		 972 err = -EEXIST;
973 goto out;
974 }
975
322f74a4 976 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4 977
63159f29 978 if (!ifa) {
ba3542e1 979 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 980 err = -ENOBUFS;
981 goto out;
982 }
983
8f031519 984 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 985 if (IS_ERR(rt)) {
986 err = PTR_ERR(rt);
987 goto out;
988 }
989
bba24896
JP		 990 neigh_parms_data_state_setall(idev->nd_parms);
991
4e3fd7a0 992 ifa->addr = *addr;
3f8f5298
JP		 993 if (peer_addr)
994 ifa->peer_addr = *peer_addr;
1da177e4
LT		 995
996 spin_lock_init(&ifa->lock);
c15b1cca 997 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 998 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 999 ifa->scope = scope;
1000 ifa->prefix_len = pfxlen;
1001 ifa->flags = flags | IFA_F_TENTATIVE;
8a226b2c
JB		 1002 ifa->valid_lft = valid_lft;
1003 ifa->prefered_lft = prefered_lft;
1da177e4 1004 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 1005 ifa->tokenized = false;
1da177e4 1006
57f5f544
KF		 1007 ifa->rt = rt;
1008
1da177e4
LT		 1009 ifa->idev = idev;
1010 in6_dev_hold(idev);
1011 /* For caller */
1012 in6_ifa_hold(ifa);
1013
1014 /* Add to big hash table */
ddbe5032 1015 hash = inet6_addr_hash(addr);
1da177e4 1016
5c578aed 1017 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 1018 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 1019
1020 write_lock(&idev->lock);
1021 /* Add to inet6_dev unicast addr list. */
e55ffac6 1022 ipv6_link_dev_addr(idev, ifa);
1da177e4 1023
1da177e4 1024 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 1025 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 1026 in6_ifa_hold(ifa);
1027 }
1da177e4 1028
1da177e4
LT		 1029 in6_ifa_hold(ifa);
1030 write_unlock(&idev->lock);
1031out2:
8814c4b5 1032 rcu_read_unlock_bh();
1da177e4 1033
fd92833a 1034 if (likely(err == 0))
f88c91dd 1035 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 1036 else {
1037 kfree(ifa);
1038 ifa = ERR_PTR(err);
1039 }
1040
1041 return ifa;
1042out:
5c578aed 1043 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 1044 goto out2;
1045}
1046
5b84efec
TH		 1047enum cleanup_prefix_rt_t {
1048 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1049 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1050 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1051};
1052
1053/*
1054 * Check, whether the prefix for ifp would still need a prefix route
1055 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1056 * constants.
1057 *
1058 * 1) we don't purge prefix if address was not permanent.
1059 * prefix is managed by its own lifetime.
1060 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1061 * 3) if there are no addresses, delete prefix.
1062 * 4) if there are still other permanent address(es),
1063 * corresponding prefix is still permanent.
1064 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1065 * don't purge the prefix, assume user space is managing it.
1066 * 6) otherwise, update prefix lifetime to the
1067 * longest valid lifetime among the corresponding
1068 * addresses on the device.
1069 * Note: subsequent RA will update lifetime.
1070 **/
1071static enum cleanup_prefix_rt_t
1072check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1073{
1074 struct inet6_ifaddr *ifa;
1075 struct inet6_dev *idev = ifp->idev;
1076 unsigned long lifetime;
1077 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1078
1079 *expires = jiffies;
1080
1081 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1082 if (ifa == ifp)
1083 continue;
1084 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1085 ifp->prefix_len))
1086 continue;
1087 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1088 return CLEANUP_PREFIX_RT_NOP;
1089
1090 action = CLEANUP_PREFIX_RT_EXPIRE;
1091
1092 spin_lock(&ifa->lock);
1093
1094 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1095 /*
1096 * Note: Because this address is
1097 * not permanent, lifetime <
1098 * LONG_MAX / HZ here.
1099 */
1100 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1101 *expires = ifa->tstamp + lifetime * HZ;
1102 spin_unlock(&ifa->lock);
1103 }
1104
1105 return action;
1106}
1107
1108static void
1109cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1110{
1111 struct rt6_info *rt;
1112
1113 rt = addrconf_get_prefix_route(&ifp->addr,
1114 ifp->prefix_len,
1115 ifp->idev->dev,
1116 0, RTF_GATEWAY | RTF_DEFAULT);
1117 if (rt) {
1118 if (del_rt)
1119 ip6_del_rt(rt);
1120 else {
1121 if (!(rt->rt6i_flags & RTF_EXPIRES))
1122 rt6_set_expires(rt, expires);
1123 ip6_rt_put(rt);
1124 }
1125 }
1126}
1127
1128
1da177e4
LT		 1129/* This function wants to get referenced ifp and releases it before return */
1130
1131static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1132{
4c5ff6a6 1133 int state;
5b84efec
TH		 1134 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1135 unsigned long expires;
1da177e4 1136
c15b1cca
HFS		 1137 ASSERT_RTNL();
1138
8e8e676d 1139 spin_lock_bh(&ifp->lock);
4c5ff6a6 1140 state = ifp->state;
e9d3e084 1141 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1142 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1143
1144 if (state == INET6_IFADDR_STATE_DEAD)
1145 goto out;
1da177e4 1146
5c578aed 1147 spin_lock_bh(&addrconf_hash_lock);
1148 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1149 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1150
5b84efec 1151 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1152
1da177e4 1153 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1154 list_del(&ifp->tmp_list);
1155 if (ifp->ifpub) {
1156 in6_ifa_put(ifp->ifpub);
1157 ifp->ifpub = NULL;
1da177e4 1158 }
372e6c8f 1159 __in6_ifa_put(ifp);
1da177e4 1160 }
1da177e4 1161
5b84efec
TH		 1162 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1163 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1164
5b84efec
TH		 1165 list_del_init(&ifp->if_list);
1166 __in6_ifa_put(ifp);
1167
1168 write_unlock_bh(&ifp->idev->lock);
1da177e4 1169
c15b1cca 1170 addrconf_del_dad_work(ifp);
b2238566 1171
1da177e4
LT		 1172 ipv6_ifa_notify(RTM_DELADDR, ifp);
1173
f88c91dd 1174 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1175
5b84efec
TH		 1176 if (action != CLEANUP_PREFIX_RT_NOP) {
1177 cleanup_prefix_route(ifp, expires,
1178 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1179 }
1180
c3968a85
DW		 1181 /* clean up prefsrc entries */
1182 rt6_remove_prefsrc(ifp);
4c5ff6a6 1183out:
1da177e4
LT		 1184 in6_ifa_put(ifp);
1185}
1186
1da177e4
LT		 1187static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1188{
1189 struct inet6_dev *idev = ifp->idev;
1190 struct in6_addr addr, *tmpaddr;
76f793e3 1191 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1192 unsigned long regen_advance;
1da177e4
LT		 1193 int tmp_plen;
1194 int ret = 0;
95c385b4 1195 u32 addr_flags;
76f793e3 1196 unsigned long now = jiffies;
76506a98 1197 long max_desync_factor;
7aa8e63f 1198 s32 cnf_temp_preferred_lft;
1da177e4 1199
53bd6749 1200 write_lock_bh(&idev->lock);
1da177e4
LT		 1201 if (ift) {
1202 spin_lock_bh(&ift->lock);
1203 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1204 spin_unlock_bh(&ift->lock);
1205 tmpaddr = &addr;
1206 } else {
1207 tmpaddr = NULL;
1208 }
1209retry:
1210 in6_dev_hold(idev);
1211 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1212 write_unlock_bh(&idev->lock);
f3213831 1213 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1214 in6_dev_put(idev);
1215 ret = -1;
1216 goto out;
1217 }
1218 spin_lock_bh(&ifp->lock);
1219 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1220 idev->cnf.use_tempaddr = -1; /*XXX*/
1221 spin_unlock_bh(&ifp->lock);
53bd6749 1222 write_unlock_bh(&idev->lock);
f3213831
JP		 1223 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1224 __func__);
1da177e4
LT		 1225 in6_dev_put(idev);
1226 ret = -1;
1227 goto out;
1228 }
1229 in6_ifa_hold(ifp);
1230 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
9d6280da 1231 ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1232 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1233 age = (now - ifp->tstamp) / HZ;
76506a98
JB		 1234
1235 regen_advance = idev->cnf.regen_max_retry *
1236 idev->cnf.dad_transmits *
1237 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1238
1239 /* recalculate max_desync_factor each time and update
1240 * idev->desync_factor if it's larger
1241 */
7aa8e63f 1242 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
76506a98
JB		 1243 max_desync_factor = min_t(__u32,
1244 idev->cnf.max_desync_factor,
7aa8e63f 1245 cnf_temp_preferred_lft - regen_advance);
76506a98
JB		 1246
1247 if (unlikely(idev->desync_factor > max_desync_factor)) {
1248 if (max_desync_factor > 0) {
1249 get_random_bytes(&idev->desync_factor,
1250 sizeof(idev->desync_factor));
1251 idev->desync_factor %= max_desync_factor;
1252 } else {
1253 idev->desync_factor = 0;
1254 }
1255 }
1256
1da177e4
LT		 1257 tmp_valid_lft = min_t(__u32,
1258 ifp->valid_lft,
7a876b0e 1259 idev->cnf.temp_valid_lft + age);
7aa8e63f 1260 tmp_prefered_lft = cnf_temp_preferred_lft + age -
76506a98 1261 idev->desync_factor;
76506a98 1262 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1da177e4 1263 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1264 tmp_tstamp = ifp->tstamp;
1265 spin_unlock_bh(&ifp->lock);
1266
53bd6749 1267 write_unlock_bh(&idev->lock);
95c385b4 1268
eac55bf9
BB		 1269 /* A temporary address is created only if this calculated Preferred
1270 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1271 * an implementation must not create a temporary address with a zero
1272 * Preferred Lifetime.
ecab6701
HK		 1273 * Use age calculation as in addrconf_verify to avoid unnecessary
1274 * temporary addresses being generated.
eac55bf9 1275 */
ecab6701
HK		 1276 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1277 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1278 in6_ifa_put(ifp);
1279 in6_dev_put(idev);
1280 ret = -1;
1281 goto out;
1282 }
1283
95c385b4
NH		 1284 addr_flags = IFA_F_TEMPORARY;
1285 /* set in addrconf_prefix_rcv() */
1286 if (ifp->flags & IFA_F_OPTIMISTIC)
1287 addr_flags |= IFA_F_OPTIMISTIC;
1288
4b08a8f1
HFS		 1289 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1290 ipv6_addr_scope(&addr), addr_flags,
1291 tmp_valid_lft, tmp_prefered_lft);
1292 if (IS_ERR(ift)) {
1da177e4
LT		 1293 in6_ifa_put(ifp);
1294 in6_dev_put(idev);
f3213831 1295 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1296 tmpaddr = &addr;
53bd6749 1297 write_lock_bh(&idev->lock);
1da177e4
LT		 1298 goto retry;
1299 }
1300
1301 spin_lock_bh(&ift->lock);
1302 ift->ifpub = ifp;
76f793e3 1303 ift->cstamp = now;
1da177e4
LT		 1304 ift->tstamp = tmp_tstamp;
1305 spin_unlock_bh(&ift->lock);
1306
cf22f9a2 1307 addrconf_dad_start(ift);
1da177e4
LT		 1308 in6_ifa_put(ift);
1309 in6_dev_put(idev);
1310out:
1311 return ret;
1312}
1da177e4
LT		 1313
1314/*
072047e4 1315 * Choose an appropriate source address (RFC3484)
1da177e4 1316 */
a9b05723
YH		 1317enum {
1318 IPV6_SADDR_RULE_INIT = 0,
1319 IPV6_SADDR_RULE_LOCAL,
1320 IPV6_SADDR_RULE_SCOPE,
1321 IPV6_SADDR_RULE_PREFERRED,
1322#ifdef CONFIG_IPV6_MIP6
1323 IPV6_SADDR_RULE_HOA,
1324#endif
1325 IPV6_SADDR_RULE_OIF,
1326 IPV6_SADDR_RULE_LABEL,
a9b05723 1327 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1328 IPV6_SADDR_RULE_ORCHID,
1329 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1330#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1331 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1332#endif
a9b05723
YH		 1333 IPV6_SADDR_RULE_MAX
1334};
1335
072047e4 1336struct ipv6_saddr_score {
a9b05723
YH		 1337 int rule;
1338 int addr_type;
1339 struct inet6_ifaddr *ifa;
1340 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1341 int scopedist;
1342 int matchlen;
072047e4
YH		 1343};
1344
a9b05723 1345struct ipv6_saddr_dst {
9acd9f3a 1346 const struct in6_addr *addr;
a9b05723
YH		 1347 int ifindex;
1348 int scope;
1349 int label;
7cbca67c 1350 unsigned int prefs;
a9b05723 1351};
072047e4 1352
b6f99a21 1353static inline int ipv6_saddr_preferred(int type)
1da177e4 1354{
45bb0060 1355 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1356 return 1;
1357 return 0;
1da177e4
LT		 1358}
1359
7fd2561e
EK		 1360static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1361{
1362#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1363 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1364#else
1365 return false;
1366#endif
1367}
1368
3de23255
BT		 1369static int ipv6_get_saddr_eval(struct net *net,
1370 struct ipv6_saddr_score *score,
a9b05723
YH		 1371 struct ipv6_saddr_dst *dst,
1372 int i)
1373{
1374 int ret;
1375
1376 if (i <= score->rule) {
1377 switch (i) {
1378 case IPV6_SADDR_RULE_SCOPE:
1379 ret = score->scopedist;
1380 break;
1381 case IPV6_SADDR_RULE_PREFIX:
1382 ret = score->matchlen;
1383 break;
1384 default:
1385 ret = !!test_bit(i, score->scorebits);
1386 }
1387 goto out;
1388 }
1389
1390 switch (i) {
1391 case IPV6_SADDR_RULE_INIT:
1392 /* Rule 0: remember if hiscore is not ready yet */
1393 ret = !!score->ifa;
1394 break;
1395 case IPV6_SADDR_RULE_LOCAL:
1396 /* Rule 1: Prefer same address */
1397 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1398 break;
1399 case IPV6_SADDR_RULE_SCOPE:
1400 /* Rule 2: Prefer appropriate scope
1401 *
1402 * ret
1403 * ^
1404 * -1 | d 15
1405 * ---+--+-+---> scope
1406 * |
1407 * | d is scope of the destination.
1408 * B-d | \
1409 * | \ <- smaller scope is better if
db9c7c39 1410 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1411 * | ret = B - scope (-1 <= scope >= d <= 15).
1412 * d-C-1 | /
1413 * |/ <- greater is better
1414 * -C / if scope is not enough for destination.
1415 * /| ret = scope - C (-1 <= d < scope <= 15).
1416 *
1417 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1418 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1419 * Assume B = 0 and we get C > 29.
1420 */
1421 ret = __ipv6_addr_src_scope(score->addr_type);
1422 if (ret >= dst->scope)
1423 ret = -ret;
1424 else
1425 ret -= 128; /* 30 is enough */
1426 score->scopedist = ret;
1427 break;
1428 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1429 {
a9b05723 1430 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1431 u8 avoid = IFA_F_DEPRECATED;
1432
1433 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1434 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1435 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1436 !(score->ifa->flags & avoid);
a9b05723 1437 break;
7fd2561e 1438 }
a9b05723
YH		 1439#ifdef CONFIG_IPV6_MIP6
1440 case IPV6_SADDR_RULE_HOA:
7cbca67c 1441 {
a9b05723 1442 /* Rule 4: Prefer home address */
7cbca67c
YH		 1443 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1444 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1445 break;
7cbca67c 1446 }
a9b05723
YH		 1447#endif
1448 case IPV6_SADDR_RULE_OIF:
1449 /* Rule 5: Prefer outgoing interface */
1450 ret = (!dst->ifindex ||
1451 dst->ifindex == score->ifa->idev->dev->ifindex);
1452 break;
1453 case IPV6_SADDR_RULE_LABEL:
1454 /* Rule 6: Prefer matching label */
3de23255
BT		 1455 ret = ipv6_addr_label(net,
1456 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1457 score->ifa->idev->dev->ifindex) == dst->label;
1458 break;
a9b05723 1459 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1460 {
a9b05723 1461 /* Rule 7: Prefer public address
25985edc 1462 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1463 */
7cbca67c
YH		 1464 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1465 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1466 score->ifa->idev->cnf.use_tempaddr >= 2;
1467 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1468 break;
7cbca67c 1469 }
a9b05723
YH		 1470 case IPV6_SADDR_RULE_ORCHID:
1471 /* Rule 8-: Prefer ORCHID vs ORCHID or
1472 * non-ORCHID vs non-ORCHID
1473 */
1474 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1475 ipv6_addr_orchid(dst->addr));
1476 break;
1477 case IPV6_SADDR_RULE_PREFIX:
1478 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1479 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1480 if (ret > score->ifa->prefix_len)
1481 ret = score->ifa->prefix_len;
1482 score->matchlen = ret;
a9b05723 1483 break;
7fd2561e
EK		 1484#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1485 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1486 /* Optimistic addresses still have lower precedence than other
1487 * preferred addresses.
1488 */
1489 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1490 break;
1491#endif
a9b05723
YH		 1492 default:
1493 ret = 0;
1494 }
1495
1496 if (ret)
1497 __set_bit(i, score->scorebits);
1498 score->rule = i;
1499out:
1500 return ret;
1501}
1502
c0b8da1e
YH		 1503static int __ipv6_dev_get_saddr(struct net *net,
1504 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1505 struct inet6_dev *idev,
1506 struct ipv6_saddr_score *scores,
1507 int hiscore_idx)
9131f3de 1508{
c0b8da1e 1509 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de
YH		 1510
1511 read_lock_bh(&idev->lock);
1512 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1513 int i;
1514
1515 /*
1516 * - Tentative Address (RFC2462 section 5.4)
1517 * - A tentative address is not considered
1518 * "assigned to an interface" in the traditional
1519 * sense, unless it is also flagged as optimistic.
1520 * - Candidate Source Address (section 4)
1521 * - In any case, anycast addresses, multicast
1522 * addresses, and the unspecified address MUST
1523 * NOT be included in a candidate set.
1524 */
1525 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1526 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1527 continue;
1528
1529 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1530
1531 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1532 score->addr_type & IPV6_ADDR_MULTICAST)) {
1533 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1534 idev->dev->name);
1535 continue;
1536 }
1537
1538 score->rule = -1;
1539 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1540
1541 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1542 int minihiscore, miniscore;
1543
1544 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1545 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1546
1547 if (minihiscore > miniscore) {
1548 if (i == IPV6_SADDR_RULE_SCOPE &&
1549 score->scopedist > 0) {
1550 /*
1551 * special case:
1552 * each remaining entry
1553 * has too small (not enough)
1554 * scope, because ifa entries
1555 * are sorted by their scope
1556 * values.
1557 */
1558 goto out;
1559 }
1560 break;
1561 } else if (minihiscore < miniscore) {
1562 if (hiscore->ifa)
1563 in6_ifa_put(hiscore->ifa);
1564
1565 in6_ifa_hold(score->ifa);
1566
1567 swap(hiscore, score);
c0b8da1e 1568 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1569
1570 /* restore our iterator */
1571 score->ifa = hiscore->ifa;
1572
1573 break;
1574 }
1575 }
1576 }
1577out:
1578 read_unlock_bh(&idev->lock);
c0b8da1e 1579 return hiscore_idx;
9131f3de
YH		 1580}
1581
afbac601
DA		 1582static int ipv6_get_saddr_master(struct net *net,
1583 const struct net_device *dst_dev,
1584 const struct net_device *master,
1585 struct ipv6_saddr_dst *dst,
1586 struct ipv6_saddr_score *scores,
1587 int hiscore_idx)
1588{
1589 struct inet6_dev *idev;
1590
1591 idev = __in6_dev_get(dst_dev);
1592 if (idev)
1593 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1594 scores, hiscore_idx);
1595
1596 idev = __in6_dev_get(master);
1597 if (idev)
1598 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1599 scores, hiscore_idx);
1600
1601 return hiscore_idx;
1602}
1603
b3f644fc 1604int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1605 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1606 struct in6_addr *saddr)
1da177e4 1607{
c0b8da1e 1608 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1609 struct ipv6_saddr_dst dst;
9131f3de 1610 struct inet6_dev *idev;
072047e4 1611 struct net_device *dev;
a9b05723 1612 int dst_type;
9131f3de 1613 bool use_oif_addr = false;
c0b8da1e 1614 int hiscore_idx = 0;
1da177e4 1615
a9b05723
YH		 1616 dst_type = __ipv6_addr_type(daddr);
1617 dst.addr = daddr;
1618 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1619 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1620 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1621 dst.prefs = prefs;
a9b05723 1622
c0b8da1e
YH		 1623 scores[hiscore_idx].rule = -1;
1624 scores[hiscore_idx].ifa = NULL;
1da177e4 1625
8814c4b5 1626 rcu_read_lock();
1da177e4 1627
9131f3de
YH		 1628 /* Candidate Source Address (section 4)
1629 * - multicast and link-local destination address,
1630 * the set of candidate source address MUST only
1631 * include addresses assigned to interfaces
1632 * belonging to the same link as the outgoing
1633 * interface.
1634 * (- For site-local destination addresses, the
1635 * set of candidate source addresses MUST only
1636 * include addresses assigned to interfaces
1637 * belonging to the same site as the outgoing
1638 * interface.)
3985e8a3
EK		 1639 * - "It is RECOMMENDED that the candidate source addresses
1640 * be the set of unicast addresses assigned to the
1641 * interface that will be used to send to the destination
1642 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1643 */
1644 if (dst_dev) {
3985e8a3 1645 idev = __in6_dev_get(dst_dev);
9131f3de 1646 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1647 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1648 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1649 use_oif_addr = true;
1650 }
1651 }
a9b05723 1652
9131f3de 1653 if (use_oif_addr) {
c0b8da1e 1654 if (idev)
c15df306 1655 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de 1656 } else {
afbac601
DA		 1657 const struct net_device *master;
1658 int master_idx = 0;
1659
1660 /* if dst_dev exists and is enslaved to an L3 device, then
1661 * prefer addresses from dst_dev and then the master over
1662 * any other enslaved devices in the L3 domain.
1663 */
1664 master = l3mdev_master_dev_rcu(dst_dev);
1665 if (master) {
1666 master_idx = master->ifindex;
1667
1668 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1669 master, &dst,
1670 scores, hiscore_idx);
1671
1672 if (scores[hiscore_idx].ifa)
1673 goto out;
1674 }
1675
9131f3de 1676 for_each_netdev_rcu(net, dev) {
afbac601
DA		 1677 /* only consider addresses on devices in the
1678 * same L3 domain
1679 */
1680 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1681 continue;
9131f3de
YH		 1682 idev = __in6_dev_get(dev);
1683 if (!idev)
072047e4 1684 continue;
c15df306 1685 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1686 }
1687 }
afbac601
DA		 1688
1689out:
8814c4b5 1690 rcu_read_unlock();
1da177e4 1691
c0b8da1e 1692 hiscore = &scores[hiscore_idx];
a9b05723 1693 if (!hiscore->ifa)
072047e4 1694 return -EADDRNOTAVAIL;
1ab1457c 1695
4e3fd7a0 1696 *saddr = hiscore->ifa->addr;
a9b05723 1697 in6_ifa_put(hiscore->ifa);
072047e4 1698 return 0;
1da177e4 1699}
5e5f3f0f 1700EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1701
8965779d 1702int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1703 u32 banned_flags)
b7b1bfce
HFS		 1704{
1705 struct inet6_ifaddr *ifp;
1706 int err = -EADDRNOTAVAIL;
1707
602582ca
HFS		 1708 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1709 if (ifp->scope > IFA_LINK)
1710 break;
b7b1bfce
HFS		 1711 if (ifp->scope == IFA_LINK &&
1712 !(ifp->flags & banned_flags)) {
1713 *addr = ifp->addr;
1714 err = 0;
1715 break;
1716 }
1717 }
1718 return err;
1719}
1720
95c385b4 1721int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1722 u32 banned_flags)
1da177e4
LT		 1723{
1724 struct inet6_dev *idev;
1725 int err = -EADDRNOTAVAIL;
1726
8814c4b5 1727 rcu_read_lock();
e21e8467
SH		 1728 idev = __in6_dev_get(dev);
1729 if (idev) {
1da177e4 1730 read_lock_bh(&idev->lock);
b7b1bfce 1731 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1732 read_unlock_bh(&idev->lock);
1733 }
8814c4b5 1734 rcu_read_unlock();
1da177e4
LT		 1735 return err;
1736}
1737
1738static int ipv6_count_addresses(struct inet6_dev *idev)
1739{
1740 int cnt = 0;
1741 struct inet6_ifaddr *ifp;
1742
1743 read_lock_bh(&idev->lock);
502a2ffd 1744 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1745 cnt++;
1746 read_unlock_bh(&idev->lock);
1747 return cnt;
1748}
1749
b71d1d42 1750int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1751 const struct net_device *dev, int strict)
c58da4c6
EK		 1752{
1753 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1754}
1755EXPORT_SYMBOL(ipv6_chk_addr);
1756
1757int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1758 const struct net_device *dev, int strict,
1759 u32 banned_flags)
1da177e4 1760{
eedf042a 1761 struct inet6_ifaddr *ifp;
ddbe5032 1762 unsigned int hash = inet6_addr_hash(addr);
c58da4c6 1763 u32 ifp_flags;
1da177e4 1764
5c578aed 1765 rcu_read_lock_bh();
b67bfe0d 1766 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1767 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1768 continue;
c58da4c6
EK		 1769 /* Decouple optimistic from tentative for evaluation here.
1770 * Ban optimistic addresses explicitly, when required.
1771 */
1772 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1773 ? (ifp->flags&~IFA_F_TENTATIVE)
1774 : ifp->flags;
1da177e4 1775 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1776 !(ifp_flags&banned_flags) &&
63159f29 1777 (!dev || ifp->idev->dev == dev ||
eedf042a
SH		 1778 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1779 rcu_read_unlock_bh();
1780 return 1;
1da177e4
LT		 1781 }
1782 }
5c578aed 1783
eedf042a
SH		 1784 rcu_read_unlock_bh();
1785 return 0;
1da177e4 1786}
c58da4c6 1787EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1788
3e81c6da
DM		 1789static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1790 struct net_device *dev)
1da177e4 1791{
ddbe5032 1792 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1793 struct inet6_ifaddr *ifp;
1da177e4 1794
b67bfe0d 1795 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1796 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1797 continue;
1da177e4 1798 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1799 if (!dev || ifp->idev->dev == dev)
3e81c6da 1800 return true;
1da177e4
LT		 1801 }
1802 }
3e81c6da 1803 return false;
1da177e4
LT		 1804}
1805
7df37ff3
CB		 1806/* Compares an address/prefix_len with addresses on device @dev.
1807 * If one is found it returns true.
1808 */
1809bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1810 const unsigned int prefix_len, struct net_device *dev)
1811{
1812 struct inet6_dev *idev;
1813 struct inet6_ifaddr *ifa;
1814 bool ret = false;
1815
1816 rcu_read_lock();
1817 idev = __in6_dev_get(dev);
1818 if (idev) {
1819 read_lock_bh(&idev->lock);
1820 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1821 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1822 if (ret)
1823 break;
1824 }
1825 read_unlock_bh(&idev->lock);
1826 }
1827 rcu_read_unlock();
1828
1829 return ret;
1830}
1831EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1832
b71d1d42 1833int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1834{
1835 struct inet6_dev *idev;
1836 struct inet6_ifaddr *ifa;
1837 int onlink;
1838
1839 onlink = 0;
1840 rcu_read_lock();
1841 idev = __in6_dev_get(dev);
1842 if (idev) {
1843 read_lock_bh(&idev->lock);
502a2ffd 1844 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1845 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1846 ifa->prefix_len);
1847 if (onlink)
1848 break;
1849 }
1850 read_unlock_bh(&idev->lock);
1851 }
1852 rcu_read_unlock();
1853 return onlink;
1854}
52eeeb84
YH		 1855EXPORT_SYMBOL(ipv6_chk_prefix);
1856
9acd9f3a 1857struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1858 struct net_device *dev, int strict)
1da177e4 1859{
b79d1d54 1860 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1861 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1862
5c578aed 1863 rcu_read_lock_bh();
b67bfe0d 1864 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1865 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1866 continue;
1da177e4 1867 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1868 if (!dev || ifp->idev->dev == dev ||
1da177e4 1869 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1870 result = ifp;
1da177e4
LT		 1871 in6_ifa_hold(ifp);
1872 break;
1873 }
1874 }
1875 }
5c578aed 1876 rcu_read_unlock_bh();
1da177e4 1877
b79d1d54 1878 return result;
1da177e4
LT		 1879}
1880
1da177e4
LT		 1881/* Gets referenced address, destroys ifaddr */
1882
cc411d0b 1883static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1884{
3d171f39
LR		 1885 if (dad_failed)
1886 ifp->flags |= IFA_F_DADFAILED;
1887
1da177e4
LT		 1888 if (ifp->flags&IFA_F_PERMANENT) {
1889 spin_lock_bh(&ifp->lock);
c15b1cca 1890 addrconf_del_dad_work(ifp);
1da177e4
LT		 1891 ifp->flags |= IFA_F_TENTATIVE;
1892 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1893 if (dad_failed)
1894 ipv6_ifa_notify(0, ifp);
1da177e4 1895 in6_ifa_put(ifp);
1da177e4
LT		 1896 } else if (ifp->flags&IFA_F_TEMPORARY) {
1897 struct inet6_ifaddr *ifpub;
1898 spin_lock_bh(&ifp->lock);
1899 ifpub = ifp->ifpub;
1900 if (ifpub) {
1901 in6_ifa_hold(ifpub);
1902 spin_unlock_bh(&ifp->lock);
1903 ipv6_create_tempaddr(ifpub, ifp);
1904 in6_ifa_put(ifpub);
1905 } else {
1906 spin_unlock_bh(&ifp->lock);
1907 }
1908 ipv6_del_addr(ifp);
c15b1cca 1909 } else {
1da177e4 1910 ipv6_del_addr(ifp);
c15b1cca 1911 }
1da177e4
LT		 1912}
1913
f2344a13
HX		 1914static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1915{
1916 int err = -ENOENT;
1917
8e8e676d 1918 spin_lock_bh(&ifp->lock);
f2344a13
HX		 1919 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1920 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1921 err = 0;
1922 }
8e8e676d 1923 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 1924
1925 return err;
1926}
1927
3c21edbd
YH		 1928void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1929{
1b34be74 1930 struct inet6_dev *idev = ifp->idev;
1855b7c3 1931 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 1932
853dc2e0
UB		 1933 if (addrconf_dad_end(ifp)) {
1934 in6_ifa_put(ifp);
f2344a13 1935 return;
853dc2e0 1936 }
f2344a13 1937
e87cc472
JP		 1938 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1939 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1940
5f40ef77
HFS		 1941 spin_lock_bh(&ifp->lock);
1942
1943 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1944 int scope = ifp->scope;
1945 u32 flags = ifp->flags;
1946 struct in6_addr new_addr;
1947 struct inet6_ifaddr *ifp2;
1948 u32 valid_lft, preferred_lft;
1949 int pfxlen = ifp->prefix_len;
5f40ef77
HFS		 1950 int retries = ifp->stable_privacy_retry + 1;
1951
1855b7c3 1952 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 1953 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1954 ifp->idev->dev->name);
1955 goto errdad;
1956 }
1957
1958 new_addr = ifp->addr;
1959 if (ipv6_generate_stable_address(&new_addr, retries,
1960 idev))
1961 goto errdad;
1962
1963 valid_lft = ifp->valid_lft;
1964 preferred_lft = ifp->prefered_lft;
1965
1966 spin_unlock_bh(&ifp->lock);
1b34be74 1967
5f40ef77
HFS		 1968 if (idev->cnf.max_addresses &&
1969 ipv6_count_addresses(idev) >=
1970 idev->cnf.max_addresses)
1971 goto lock_errdad;
1972
1973 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1974 ifp->idev->dev->name);
1975
1976 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1977 scope, flags, valid_lft,
1978 preferred_lft);
1979 if (IS_ERR(ifp2))
1980 goto lock_errdad;
1981
1982 spin_lock_bh(&ifp2->lock);
1983 ifp2->stable_privacy_retry = retries;
1984 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1985 spin_unlock_bh(&ifp2->lock);
1986
1855b7c3 1987 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 1988 in6_ifa_put(ifp2);
1989lock_errdad:
1990 spin_lock_bh(&ifp->lock);
1b34be74
YH		 1991 }
1992
5f40ef77 1993errdad:
c15b1cca
HFS		 1994 /* transition from _POSTDAD to _ERRDAD */
1995 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 1996 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 1997
1998 addrconf_mod_dad_work(ifp, 0);
751eb6b6 1999 in6_ifa_put(ifp);
3c21edbd 2000}
1da177e4 2001
a9ed4a29
SD		 2002/* Join to solicited addr multicast group.
2003 * caller must hold RTNL */
b71d1d42 2004void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 2005{
2006 struct in6_addr maddr;
2007
2008 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2009 return;
2010
2011 addrconf_addr_solict_mult(addr, &maddr);
2012 ipv6_dev_mc_inc(dev, &maddr);
2013}
2014
a9ed4a29 2015/* caller must hold RTNL */
b71d1d42 2016void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 2017{
2018 struct in6_addr maddr;
2019
2020 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2021 return;
2022
2023 addrconf_addr_solict_mult(addr, &maddr);
2024 __ipv6_dev_mc_dec(idev, &maddr);
2025}
2026
a9ed4a29 2027/* caller must hold RTNL */
20380731 2028static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2029{
2030 struct in6_addr addr;
c15b1cca 2031
88ad3149 2032 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 2033 return;
1da177e4
LT		 2034 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2035 if (ipv6_addr_any(&addr))
2036 return;
013b4d90 2037 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 2038}
2039
a9ed4a29 2040/* caller must hold RTNL */
20380731 2041static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2042{
2043 struct in6_addr addr;
c15b1cca 2044
88ad3149 2045 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 2046 return;
1da177e4
LT		 2047 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2048 if (ipv6_addr_any(&addr))
2049 return;
2050 __ipv6_dev_ac_dec(ifp->idev, &addr);
2051}
2052
06a4c1c5 2053static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
2054{
5241c2d7 2055 if (dev->addr_len != EUI64_ADDR_LEN)
06a4c1c5 2056 return -1;
5241c2d7 2057 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
5e98a36e 2058 eui[0] ^= 2;
06a4c1c5 2059 return 0;
2060}
2061
cb6bf355
YH		 2062static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2063{
2064 union fwnet_hwaddr *ha;
2065
2066 if (dev->addr_len != FWNET_ALEN)
2067 return -1;
2068
2069 ha = (union fwnet_hwaddr *)dev->dev_addr;
2070
2071 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2072 eui[0] ^= 2;
2073 return 0;
2074}
2075
073a8e0e
YH		 2076static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2077{
2078 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2079 if (dev->addr_len != ARCNET_ALEN)
2080 return -1;
2081 memset(eui, 0, 7);
8e5e8f30 2082 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 2083 return 0;
2084}
2085
2086static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2087{
2088 if (dev->addr_len != INFINIBAND_ALEN)
2089 return -1;
2090 memcpy(eui, dev->dev_addr + 12, 8);
2091 eui[0] |= 2;
2092 return 0;
2093}
2094
c61393ea 2095static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2096{
9af28511
SH		 2097 if (addr == 0)
2098 return -1;
dfd982ba
YH		 2099 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2100 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2101 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2102 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2103 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2104 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2105 eui[1] = 0;
2106 eui[2] = 0x5E;
2107 eui[3] = 0xFE;
2108 memcpy(eui + 4, &addr, 4);
2109 return 0;
2110}
dfd982ba
YH		 2111
2112static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2113{
2114 if (dev->priv_flags & IFF_ISATAP)
2115 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2116 return -1;
2117}
2118
aee80b54 2119static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2120{
2121 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2122}
2123
e837735e
ND		 2124static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2125{
2126 memcpy(eui, dev->perm_addr, 3);
2127 memcpy(eui + 5, dev->perm_addr + 3, 3);
2128 eui[3] = 0xFF;
2129 eui[4] = 0xFE;
2130 eui[0] ^= 2;
2131 return 0;
2132}
2133
1da177e4
LT		 2134static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2135{
2136 switch (dev->type) {
2137 case ARPHRD_ETHER:
2138 case ARPHRD_FDDI:
073a8e0e 2139 return addrconf_ifid_eui48(eui, dev);
1da177e4 2140 case ARPHRD_ARCNET:
073a8e0e 2141 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2142 case ARPHRD_INFINIBAND:
073a8e0e 2143 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2144 case ARPHRD_SIT:
dfd982ba 2145 return addrconf_ifid_sit(eui, dev);
aee80b54 2146 case ARPHRD_IPGRE:
2147 return addrconf_ifid_gre(eui, dev);
e74bccb8 2148 case ARPHRD_6LOWPAN:
06a4c1c5 2149 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 2150 case ARPHRD_IEEE1394:
2151 return addrconf_ifid_ieee1394(eui, dev);
e837735e
ND		 2152 case ARPHRD_TUNNEL6:
2153 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2154 }
2155 return -1;
2156}
2157
2158static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2159{
2160 int err = -1;
2161 struct inet6_ifaddr *ifp;
2162
2163 read_lock_bh(&idev->lock);
602582ca
HFS		 2164 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2165 if (ifp->scope > IFA_LINK)
2166 break;
1da177e4
LT		 2167 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2168 memcpy(eui, ifp->addr.s6_addr+8, 8);
2169 err = 0;
2170 break;
2171 }
2172 }
2173 read_unlock_bh(&idev->lock);
2174 return err;
2175}
2176
1da177e4 2177/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
9d6280da 2178static void ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2179{
1da177e4 2180regen:
955189ef 2181 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2182 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2183
2184 /*
2185 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2186 * check if generated address is not inappropriate
2187 *
2188 * - Reserved subnet anycast (RFC 2526)
2189 * 11111101 11....11 1xxxxxxx
c7dc89c0 2190 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2191 * 00-00-5E-FE-xx-xx-xx-xx
2192 * - value 0
2193 * - XXX: already assigned to an address on the device
2194 */
1ab1457c 2195 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2196 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2197 (idev->rndid[7]&0x80))
2198 goto regen;
2199 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2200 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2201 goto regen;
2202 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2203 goto regen;
2204 }
1da177e4
LT		 2205}
2206
9d6280da 2207static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2208{
1da177e4 2209 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
9d6280da 2210 ipv6_regen_rndid(idev);
1da177e4 2211}
1da177e4
LT		 2212
2213/*
2214 * Add prefix route.
2215 */
2216
2217static void
2218addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2219 unsigned long expires, u32 flags)
1da177e4 2220{
86872cb5 2221 struct fib6_config cfg = {
ca254490 2222 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
86872cb5
TG		 2223 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2224 .fc_ifindex = dev->ifindex,
2225 .fc_expires = expires,
2226 .fc_dst_len = plen,
2227 .fc_flags = RTF_UP | flags,
c346dca1 2228 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2229 .fc_protocol = RTPROT_KERNEL,
86872cb5 2230 };
1da177e4 2231
4e3fd7a0 2232 cfg.fc_dst = *pfx;
1da177e4
LT		 2233
2234 /* Prevent useless cloning on PtP SIT.
2235 This thing is done here expecting that the whole
2236 class of non-broadcast devices need not cloning.
2237 */
07a93626 2238#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2239 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2240 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2241#endif
1da177e4 2242
86872cb5 2243 ip6_route_add(&cfg);
1da177e4
LT		 2244}
2245
14ef37b6
AH		 2246
2247static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2248 int plen,
2249 const struct net_device *dev,
2250 u32 flags, u32 noflags)
2251{
2252 struct fib6_node *fn;
2253 struct rt6_info *rt = NULL;
2254 struct fib6_table *table;
ca254490 2255 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2256
ca254490 2257 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2258 if (!table)
14ef37b6
AH		 2259 return NULL;
2260
5744dd9b 2261 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2262 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2263 if (!fn)
2264 goto out;
1f56a01f
MKL		 2265
2266 noflags |= RTF_CACHE;
14ef37b6 2267 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2268 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2269 continue;
2270 if ((rt->rt6i_flags & flags) != flags)
2271 continue;
85da53bf 2272 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2273 continue;
2274 dst_hold(&rt->dst);
2275 break;
2276 }
2277out:
5744dd9b 2278 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2279 return rt;
2280}
2281
2282
1da177e4
LT		 2283/* Create "default" multicast route to the interface */
2284
2285static void addrconf_add_mroute(struct net_device *dev)
2286{
86872cb5 2287 struct fib6_config cfg = {
ca254490 2288 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2289 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2290 .fc_ifindex = dev->ifindex,
2291 .fc_dst_len = 8,
2292 .fc_flags = RTF_UP,
c346dca1 2293 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2294 };
2295
2296 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2297
2298 ip6_route_add(&cfg);
1da177e4
LT		 2299}
2300
1da177e4
LT		 2301static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2302{
2303 struct inet6_dev *idev;
2304
2305 ASSERT_RTNL();
2306
e21e8467
SH		 2307 idev = ipv6_find_idev(dev);
2308 if (!idev)
64e724f6
BH		 2309 return ERR_PTR(-ENOBUFS);
2310
2311 if (idev->cnf.disable_ipv6)
2312 return ERR_PTR(-EACCES);
1da177e4
LT		 2313
2314 /* Add default multicast route */
ba46ee4c 2315 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
4af04aba 2316 addrconf_add_mroute(dev);
1da177e4 2317
1da177e4
LT		 2318 return idev;
2319}
2320
53bd6749
JP		 2321static void manage_tempaddrs(struct inet6_dev *idev,
2322 struct inet6_ifaddr *ifp,
2323 __u32 valid_lft, __u32 prefered_lft,
2324 bool create, unsigned long now)
2325{
2326 u32 flags;
2327 struct inet6_ifaddr *ift;
2328
2329 read_lock_bh(&idev->lock);
2330 /* update all temporary addresses in the list */
2331 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2332 int age, max_valid, max_prefered;
2333
2334 if (ifp != ift->ifpub)
2335 continue;
2336
2337 /* RFC 4941 section 3.3:
2338 * If a received option will extend the lifetime of a public
2339 * address, the lifetimes of temporary addresses should
2340 * be extended, subject to the overall constraint that no
2341 * temporary addresses should ever remain "valid" or "preferred"
2342 * for a time longer than (TEMP_VALID_LIFETIME) or
2343 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2344 */
2345 age = (now - ift->cstamp) / HZ;
2346 max_valid = idev->cnf.temp_valid_lft - age;
2347 if (max_valid < 0)
2348 max_valid = 0;
2349
2350 max_prefered = idev->cnf.temp_prefered_lft -
76506a98 2351 idev->desync_factor - age;
53bd6749
JP		 2352 if (max_prefered < 0)
2353 max_prefered = 0;
2354
2355 if (valid_lft > max_valid)
2356 valid_lft = max_valid;
2357
2358 if (prefered_lft > max_prefered)
2359 prefered_lft = max_prefered;
2360
2361 spin_lock(&ift->lock);
2362 flags = ift->flags;
2363 ift->valid_lft = valid_lft;
2364 ift->prefered_lft = prefered_lft;
2365 ift->tstamp = now;
2366 if (prefered_lft > 0)
2367 ift->flags &= ~IFA_F_DEPRECATED;
2368
2369 spin_unlock(&ift->lock);
2370 if (!(flags&IFA_F_TENTATIVE))
2371 ipv6_ifa_notify(0, ift);
2372 }
2373
2374 if ((create || list_empty(&idev->tempaddr_list)) &&
2375 idev->cnf.use_tempaddr > 0) {
2376 /* When a new public address is created as described
2377 * in [ADDRCONF], also create a new temporary address.
2378 * Also create a temporary address if it's enabled but
2379 * no temporary address currently exists.
2380 */
2381 read_unlock_bh(&idev->lock);
2382 ipv6_create_tempaddr(ifp, NULL);
2383 } else {
2384 read_unlock_bh(&idev->lock);
2385 }
2386}
2387
cc9da6cc
BM		 2388static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2389{
2390 return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2391 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2392}
2393
cc84b3c6
AA		 2394int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2395 const struct prefix_info *pinfo,
2396 struct inet6_dev *in6_dev,
2397 const struct in6_addr *addr, int addr_type,
2398 u32 addr_flags, bool sllao, bool tokenized,
2399 __u32 valid_lft, u32 prefered_lft)
4f672235
AA		 2400{
2401 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2402 int create = 0, update_lft = 0;
2403
2404 if (!ifp && valid_lft) {
2405 int max_addresses = in6_dev->cnf.max_addresses;
2406
2407#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2408 if (in6_dev->cnf.optimistic_dad &&
2409 !net->ipv6.devconf_all->forwarding && sllao)
2410 addr_flags |= IFA_F_OPTIMISTIC;
2411#endif
2412
2413 /* Do not allow to create too much of autoconfigured
2414 * addresses; this would be too easy way to crash kernel.
2415 */
2416 if (!max_addresses ||
2417 ipv6_count_addresses(in6_dev) < max_addresses)
2418 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2419 pinfo->prefix_len,
2420 addr_type&IPV6_ADDR_SCOPE_MASK,
2421 addr_flags, valid_lft,
2422 prefered_lft);
2423
2424 if (IS_ERR_OR_NULL(ifp))
2425 return -1;
2426
2427 update_lft = 0;
2428 create = 1;
2429 spin_lock_bh(&ifp->lock);
2430 ifp->flags |= IFA_F_MANAGETEMPADDR;
2431 ifp->cstamp = jiffies;
2432 ifp->tokenized = tokenized;
2433 spin_unlock_bh(&ifp->lock);
2434 addrconf_dad_start(ifp);
2435 }
2436
2437 if (ifp) {
2438 u32 flags;
2439 unsigned long now;
2440 u32 stored_lft;
2441
2442 /* update lifetime (RFC2462 5.5.3 e) */
2443 spin_lock_bh(&ifp->lock);
2444 now = jiffies;
2445 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2446 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2447 else
2448 stored_lft = 0;
2449 if (!update_lft && !create && stored_lft) {
2450 const u32 minimum_lft = min_t(u32,
2451 stored_lft, MIN_VALID_LIFETIME);
2452 valid_lft = max(valid_lft, minimum_lft);
2453
2454 /* RFC4862 Section 5.5.3e:
2455 * "Note that the preferred lifetime of the
2456 * corresponding address is always reset to
2457 * the Preferred Lifetime in the received
2458 * Prefix Information option, regardless of
2459 * whether the valid lifetime is also reset or
2460 * ignored."
2461 *
2462 * So we should always update prefered_lft here.
2463 */
2464 update_lft = 1;
2465 }
2466
2467 if (update_lft) {
2468 ifp->valid_lft = valid_lft;
2469 ifp->prefered_lft = prefered_lft;
2470 ifp->tstamp = now;
2471 flags = ifp->flags;
2472 ifp->flags &= ~IFA_F_DEPRECATED;
2473 spin_unlock_bh(&ifp->lock);
2474
2475 if (!(flags&IFA_F_TENTATIVE))
2476 ipv6_ifa_notify(0, ifp);
2477 } else
2478 spin_unlock_bh(&ifp->lock);
2479
2480 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2481 create, now);
2482
2483 in6_ifa_put(ifp);
2484 addrconf_verify();
2485 }
2486
2487 return 0;
2488}
cc84b3c6 2489EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
4f672235 2490
e6bff995 2491void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2492{
2493 struct prefix_info *pinfo;
2494 __u32 valid_lft;
2495 __u32 prefered_lft;
4f672235 2496 int addr_type, err;
64236f3f 2497 u32 addr_flags = 0;
1da177e4 2498 struct inet6_dev *in6_dev;
56d417b1 2499 struct net *net = dev_net(dev);
1da177e4
LT		 2500
2501 pinfo = (struct prefix_info *) opt;
1ab1457c 2502
1da177e4 2503 if (len < sizeof(struct prefix_info)) {
ba3542e1 2504 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2505 return;
2506 }
1ab1457c 2507
1da177e4
LT		 2508 /*
2509 * Validation checks ([ADDRCONF], page 19)
2510 */
2511
2512 addr_type = ipv6_addr_type(&pinfo->prefix);
2513
2514 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2515 return;
2516
2517 valid_lft = ntohl(pinfo->valid);
2518 prefered_lft = ntohl(pinfo->prefered);
2519
2520 if (prefered_lft > valid_lft) {
e87cc472 2521 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2522 return;
2523 }
2524
2525 in6_dev = in6_dev_get(dev);
2526
63159f29 2527 if (!in6_dev) {
e87cc472
JP		 2528 net_dbg_ratelimited("addrconf: device %s not configured\n",
2529 dev->name);
1da177e4
LT		 2530 return;
2531 }
2532
2533 /*
2534 * Two things going on here:
2535 * 1) Add routes for on-link prefixes
2536 * 2) Configure prefixes with the auto flag set
2537 */
2538
4bed72e4
YH		 2539 if (pinfo->onlink) {
2540 struct rt6_info *rt;
2541 unsigned long rt_expires;
2542
6f704992
YH		 2543 /* Avoid arithmetic overflow. Really, we could
2544 * save rt_expires in seconds, likely valid_lft,
2545 * but it would require division in fib gc, that it
2546 * not good.
2547 */
4bed72e4
YH		 2548 if (HZ > USER_HZ)
2549 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2550 else
2551 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2552
4bed72e4
YH		 2553 if (addrconf_finite_timeout(rt_expires))
2554 rt_expires *= HZ;
1da177e4 2555
14ef37b6
AH		 2556 rt = addrconf_get_prefix_route(&pinfo->prefix,
2557 pinfo->prefix_len,
2558 dev,
2559 RTF_ADDRCONF | RTF_PREFIX_RT,
2560 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2561
14ef37b6 2562 if (rt) {
6f704992
YH		 2563 /* Autoconf prefix route */
2564 if (valid_lft == 0) {
2565 ip6_del_rt(rt);
2566 rt = NULL;
4bed72e4 2567 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2568 /* not infinity */
1716a961 2569 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2570 } else {
1716a961 2571 rt6_clean_expires(rt);
1da177e4
LT		 2572 }
2573 } else if (valid_lft) {
6f704992 2574 clock_t expires = 0;
4bed72e4
YH		 2575 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2576 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2577 /* not infinity */
2578 flags |= RTF_EXPIRES;
2579 expires = jiffies_to_clock_t(rt_expires);
2580 }
1da177e4 2581 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2582 dev, expires, flags);
1da177e4 2583 }
94e187c0 2584 ip6_rt_put(rt);
1da177e4
LT		 2585 }
2586
2587 /* Try to figure out our local address for this prefix */
2588
2589 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1da177e4 2590 struct in6_addr addr;
f997c55c 2591 bool tokenized = false, dev_addr_generated = false;
1da177e4
LT		 2592
2593 if (pinfo->prefix_len == 64) {
2594 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2595
2596 if (!ipv6_addr_any(&in6_dev->token)) {
2597 read_lock_bh(&in6_dev->lock);
2598 memcpy(addr.s6_addr + 8,
2599 in6_dev->token.s6_addr + 8, 8);
2600 read_unlock_bh(&in6_dev->lock);
617fe29d 2601 tokenized = true;
cc9da6cc 2602 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2603 !ipv6_generate_stable_address(&addr, 0,
2604 in6_dev)) {
64236f3f 2605 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2606 goto ok;
f53adae4
DB		 2607 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2608 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
4f672235 2609 goto put;
f997c55c
AA		 2610 } else {
2611 dev_addr_generated = true;
1da177e4
LT		 2612 }
2613 goto ok;
2614 }
e87cc472
JP		 2615 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2616 pinfo->prefix_len);
4f672235 2617 goto put;
1da177e4
LT		 2618
2619ok:
4f672235
AA		 2620 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2621 &addr, addr_type,
2622 addr_flags, sllao,
2623 tokenized, valid_lft,
2624 prefered_lft);
2625 if (err)
2626 goto put;
f997c55c
AA		 2627
2628 /* Ignore error case here because previous prefix add addr was
2629 * successful which will be notified.
2630 */
2631 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2632 addr_type, addr_flags, sllao,
2633 tokenized, valid_lft,
2634 prefered_lft,
2635 dev_addr_generated);
1da177e4
LT		 2636 }
2637 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
4f672235 2638put:
1da177e4
LT		 2639 in6_dev_put(in6_dev);
2640}
2641
2642/*
2643 * Set destination address.
2644 * Special case for SIT interfaces where we create a new "virtual"
2645 * device.
2646 */
af284937 2647int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2648{
2649 struct in6_ifreq ireq;
2650 struct net_device *dev;
2651 int err = -EINVAL;
2652
2653 rtnl_lock();
2654
2655 err = -EFAULT;
2656 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2657 goto err_exit;
2658
af284937 2659 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2660
2661 err = -ENODEV;
63159f29 2662 if (!dev)
1da177e4
LT		 2663 goto err_exit;
2664
07a93626 2665#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2666 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2667 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2668 struct ifreq ifr;
1da177e4
LT		 2669 struct ip_tunnel_parm p;
2670
2671 err = -EADDRNOTAVAIL;
2672 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2673 goto err_exit;
2674
2675 memset(&p, 0, sizeof(p));
2676 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2677 p.iph.saddr = 0;
2678 p.iph.version = 4;
2679 p.iph.ihl = 5;
2680 p.iph.protocol = IPPROTO_IPV6;
2681 p.iph.ttl = 64;
d20b3109 2682 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2683
5bc3eb7e
SH		 2684 if (ops->ndo_do_ioctl) {
2685 mm_segment_t oldfs = get_fs();
2686
2687 set_fs(KERNEL_DS);
2688 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2689 set_fs(oldfs);
2690 } else
2691 err = -EOPNOTSUPP;
1da177e4
LT		 2692
2693 if (err == 0) {
2694 err = -ENOBUFS;
af284937
DL		 2695 dev = __dev_get_by_name(net, p.name);
2696 if (!dev)
1da177e4
LT		 2697 goto err_exit;
2698 err = dev_open(dev);
2699 }
2700 }
0be669bb 2701#endif
1da177e4
LT		 2702
2703err_exit:
2704 rtnl_unlock();
2705 return err;
2706}
2707
93a714d6
MC		 2708static int ipv6_mc_config(struct sock *sk, bool join,
2709 const struct in6_addr *addr, int ifindex)
2710{
2711 int ret;
2712
2713 ASSERT_RTNL();
2714
2715 lock_sock(sk);
2716 if (join)
54ff9ef3 2717 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2718 else
54ff9ef3 2719 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2720 release_sock(sk);
2721
2722 return ret;
2723}
2724
1da177e4
LT		 2725/*
2726 * Manual configuration of address on an interface
2727 */
479840ff
JP		 2728static int inet6_addr_add(struct net *net, int ifindex,
2729 const struct in6_addr *pfx,
caeaba79 2730 const struct in6_addr *peer_pfx,
479840ff
JP		 2731 unsigned int plen, __u32 ifa_flags,
2732 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2733{
2734 struct inet6_ifaddr *ifp;
2735 struct inet6_dev *idev;
2736 struct net_device *dev;
93a714d6
MC		 2737 unsigned long timeout;
2738 clock_t expires;
1da177e4 2739 int scope;
6f704992 2740 u32 flags;
1da177e4
LT		 2741
2742 ASSERT_RTNL();
1ab1457c 2743
24ef0da7
TG		 2744 if (plen > 128)
2745 return -EINVAL;
2746
0778769d
NT		 2747 /* check the lifetime */
2748 if (!valid_lft || prefered_lft > valid_lft)
2749 return -EINVAL;
2750
53bd6749
JP		 2751 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2752 return -EINVAL;
2753
af284937
DL		 2754 dev = __dev_get_by_index(net, ifindex);
2755 if (!dev)
1da177e4 2756 return -ENODEV;
1ab1457c 2757
64e724f6
BH		 2758 idev = addrconf_add_dev(dev);
2759 if (IS_ERR(idev))
2760 return PTR_ERR(idev);
1da177e4 2761
93a714d6
MC		 2762 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2763 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2764 true, pfx, ifindex);
2765
2766 if (ret < 0)
2767 return ret;
2768 }
2769
1da177e4
LT		 2770 scope = ipv6_addr_scope(pfx);
2771
4bed72e4
YH		 2772 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2773 if (addrconf_finite_timeout(timeout)) {
2774 expires = jiffies_to_clock_t(timeout * HZ);
2775 valid_lft = timeout;
6f704992 2776 flags = RTF_EXPIRES;
4bed72e4
YH		 2777 } else {
2778 expires = 0;
2779 flags = 0;
2780 ifa_flags |= IFA_F_PERMANENT;
6f704992 2781 }
0778769d 2782
4bed72e4
YH		 2783 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2784 if (addrconf_finite_timeout(timeout)) {
2785 if (timeout == 0)
2786 ifa_flags |= IFA_F_DEPRECATED;
2787 prefered_lft = timeout;
2788 }
0778769d 2789
8a226b2c
JB		 2790 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2791 valid_lft, prefered_lft);
0778769d 2792
1da177e4 2793 if (!IS_ERR(ifp)) {
761aac73
TH		 2794 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2795 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2796 expires, flags);
2797 }
2798
95c385b4
NH		 2799 /*
2800 * Note that section 3.1 of RFC 4429 indicates
2801 * that the Optimistic flag should not be set for
2802 * manually configured addresses
2803 */
cf22f9a2 2804 addrconf_dad_start(ifp);
53bd6749
JP		 2805 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2806 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2807 true, jiffies);
1da177e4 2808 in6_ifa_put(ifp);
c15b1cca 2809 addrconf_verify_rtnl();
1da177e4 2810 return 0;
93a714d6
MC		 2811 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2812 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2813 false, pfx, ifindex);
1da177e4
LT		 2814 }
2815
2816 return PTR_ERR(ifp);
2817}
2818
6046d5b4
HK		 2819static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2820 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2821{
2822 struct inet6_ifaddr *ifp;
2823 struct inet6_dev *idev;
2824 struct net_device *dev;
1ab1457c 2825
24ef0da7
TG		 2826 if (plen > 128)
2827 return -EINVAL;
2828
af284937
DL		 2829 dev = __dev_get_by_index(net, ifindex);
2830 if (!dev)
1da177e4
LT		 2831 return -ENODEV;
2832
e5d08d71 2833 idev = __in6_dev_get(dev);
63159f29 2834 if (!idev)
1da177e4
LT		 2835 return -ENXIO;
2836
2837 read_lock_bh(&idev->lock);
502a2ffd 2838 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2839 if (ifp->prefix_len == plen &&
2840 ipv6_addr_equal(pfx, &ifp->addr)) {
2841 in6_ifa_hold(ifp);
2842 read_unlock_bh(&idev->lock);
1ab1457c 2843
6046d5b4
HK		 2844 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2845 (ifa_flags & IFA_F_MANAGETEMPADDR))
2846 manage_tempaddrs(idev, ifp, 0, 0, false,
2847 jiffies);
1da177e4 2848 ipv6_del_addr(ifp);
6046d5b4 2849 addrconf_verify_rtnl();
93a714d6
MC		 2850 if (ipv6_addr_is_multicast(pfx)) {
2851 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2852 false, pfx, dev->ifindex);
2853 }
1da177e4
LT		 2854 return 0;
2855 }
2856 }
2857 read_unlock_bh(&idev->lock);
2858 return -EADDRNOTAVAIL;
2859}
2860
2861
af284937 2862int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2863{
2864 struct in6_ifreq ireq;
2865 int err;
1ab1457c 2866
af31f412 2867 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2868 return -EPERM;
1ab1457c 2869
1da177e4
LT		 2870 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2871 return -EFAULT;
2872
2873 rtnl_lock();
caeaba79 2874 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2875 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2876 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2877 rtnl_unlock();
2878 return err;
2879}
2880
af284937 2881int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2882{
2883 struct in6_ifreq ireq;
2884 int err;
1ab1457c 2885
af31f412 2886 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2887 return -EPERM;
2888
2889 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2890 return -EFAULT;
2891
2892 rtnl_lock();
6046d5b4 2893 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2894 ireq.ifr6_prefixlen);
1da177e4
LT		 2895 rtnl_unlock();
2896 return err;
2897}
2898
b5f348e5
IJ		 2899static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2900 int plen, int scope)
2901{
2902 struct inet6_ifaddr *ifp;
2903
8a226b2c 2904 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2905 scope, IFA_F_PERMANENT,
2906 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2907 if (!IS_ERR(ifp)) {
2908 spin_lock_bh(&ifp->lock);
2909 ifp->flags &= ~IFA_F_TENTATIVE;
2910 spin_unlock_bh(&ifp->lock);
764d3be6 2911 rt_genid_bump_ipv6(dev_net(idev->dev));
b5f348e5
IJ		 2912 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2913 in6_ifa_put(ifp);
2914 }
2915}
2916
07a93626 2917#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2918static void sit_add_v4_addrs(struct inet6_dev *idev)
2919{
1da177e4
LT		 2920 struct in6_addr addr;
2921 struct net_device *dev;
c346dca1 2922 struct net *net = dev_net(idev->dev);
929c9cf3 2923 int scope, plen;
f0e2acfa 2924 u32 pflags = 0;
1da177e4
LT		 2925
2926 ASSERT_RTNL();
2927
2928 memset(&addr, 0, sizeof(struct in6_addr));
2929 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2930
2931 if (idev->dev->flags&IFF_POINTOPOINT) {
2932 addr.s6_addr32[0] = htonl(0xfe800000);
2933 scope = IFA_LINK;
929c9cf3 2934 plen = 64;
1da177e4
LT		 2935 } else {
2936 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2937 plen = 96;
f0e2acfa 2938 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2939 }
2940
2941 if (addr.s6_addr32[3]) {
929c9cf3 2942 add_addr(idev, &addr, plen, scope);
f0e2acfa 2943 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2944 return;
2945 }
2946
6fda7350 2947 for_each_netdev(net, dev) {
8e5e8f30 2948 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2949 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2950 struct in_ifaddr *ifa;
1da177e4
LT		 2951
2952 int flag = scope;
2953
2954 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2955
2956 addr.s6_addr32[3] = ifa->ifa_local;
2957
2958 if (ifa->ifa_scope == RT_SCOPE_LINK)
2959 continue;
2960 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2961 if (idev->dev->flags&IFF_POINTOPOINT)
2962 continue;
2963 flag |= IFA_HOST;
2964 }
1da177e4 2965
b5f348e5 2966 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2967 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2968 pflags);
1da177e4
LT		 2969 }
2970 }
1ab1457c 2971 }
1da177e4 2972}
0be669bb 2973#endif
1da177e4
LT		 2974
2975static void init_loopback(struct net_device *dev)
2976{
2977 struct inet6_dev *idev;
25fb6ca4
BK		 2978 struct net_device *sp_dev;
2979 struct inet6_ifaddr *sp_ifa;
2980 struct rt6_info *sp_rt;
1da177e4
LT		 2981
2982 /* ::1 */
2983
2984 ASSERT_RTNL();
2985
e5d08d71 2986 idev = ipv6_find_idev(dev);
63159f29 2987 if (!idev) {
91df42be 2988 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2989 return;
2990 }
2991
b5f348e5 2992 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 2993
2994 /* Add routes to other interface's IPv6 addresses */
2995 for_each_netdev(dev_net(dev), sp_dev) {
2996 if (!strcmp(sp_dev->name, dev->name))
2997 continue;
2998
2999 idev = __in6_dev_get(sp_dev);
3000 if (!idev)
3001 continue;
3002
3003 read_lock_bh(&idev->lock);
3004 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
3005
3006 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
3007 continue;
3008
33d99113
G		 3009 if (sp_ifa->rt) {
3010 /* This dst has been added to garbage list when
3011 * lo device down, release this obsolete dst and
3012 * reallocate a new router for ifa.
3013 */
a220445f 3014 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
33d99113
G		 3015 ip6_rt_put(sp_ifa->rt);
3016 sp_ifa->rt = NULL;
3017 } else {
3018 continue;
3019 }
3020 }
a881ae1f 3021
57ec0afe 3022 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 3023
3024 /* Failure cases are ignored */
534c8779
G		 3025 if (!IS_ERR(sp_rt)) {
3026 sp_ifa->rt = sp_rt;
25fb6ca4 3027 ip6_ins_rt(sp_rt);
534c8779 3028 }
25fb6ca4
BK		 3029 }
3030 read_unlock_bh(&idev->lock);
3031 }
1da177e4
LT		 3032}
3033
2ad3ed59
AA		 3034void addrconf_add_linklocal(struct inet6_dev *idev,
3035 const struct in6_addr *addr, u32 flags)
1da177e4 3036{
8e5e8f30 3037 struct inet6_ifaddr *ifp;
64236f3f 3038 u32 addr_flags = flags | IFA_F_PERMANENT;
95c385b4
NH		 3039
3040#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3041 if (idev->cnf.optimistic_dad &&
702beb87 3042 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 3043 addr_flags |= IFA_F_OPTIMISTIC;
3044#endif
1da177e4 3045
07edd741
HFS		 3046 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3047 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 3048 if (!IS_ERR(ifp)) {
46d48046 3049 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 3050 addrconf_dad_start(ifp);
1da177e4
LT		 3051 in6_ifa_put(ifp);
3052 }
3053}
2ad3ed59 3054EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
1da177e4 3055
622c81d5
HFS		 3056static bool ipv6_reserved_interfaceid(struct in6_addr address)
3057{
3058 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3059 return true;
3060
3061 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3062 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3063 return true;
3064
3065 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3066 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3067 return true;
3068
3069 return false;
3070}
3071
3072static int ipv6_generate_stable_address(struct in6_addr *address,
3073 u8 dad_count,
3074 const struct inet6_dev *idev)
3075{
622c81d5
HFS		 3076 static DEFINE_SPINLOCK(lock);
3077 static __u32 digest[SHA_DIGEST_WORDS];
3078 static __u32 workspace[SHA_WORKSPACE_WORDS];
3079
3080 static union {
3081 char __data[SHA_MESSAGE_BYTES];
3082 struct {
3083 struct in6_addr secret;
ff40217e 3084 __be32 prefix[2];
622c81d5
HFS		 3085 unsigned char hwaddr[MAX_ADDR_LEN];
3086 u8 dad_count;
3087 } __packed;
3088 } data;
3089
3090 struct in6_addr secret;
3091 struct in6_addr temp;
3092 struct net *net = dev_net(idev->dev);
3093
3094 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3095
3096 if (idev->cnf.stable_secret.initialized)
3097 secret = idev->cnf.stable_secret.secret;
3098 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3099 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3100 else
3101 return -1;
3102
3103retry:
3104 spin_lock_bh(&lock);
3105
3106 sha_init(digest);
3107 memset(&data, 0, sizeof(data));
3108 memset(workspace, 0, sizeof(workspace));
3109 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3110 data.prefix[0] = address->s6_addr32[0];
3111 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3112 data.secret = secret;
3113 data.dad_count = dad_count;
3114
3115 sha_transform(digest, data.__data, workspace);
3116
3117 temp = *address;
ff40217e
HFS		 3118 temp.s6_addr32[2] = (__force __be32)digest[0];
3119 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3120
3121 spin_unlock_bh(&lock);
3122
3123 if (ipv6_reserved_interfaceid(temp)) {
3124 dad_count++;
1855b7c3 3125 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3126 return -1;
3127 goto retry;
3128 }
3129
3130 *address = temp;
3131 return 0;
3132}
3133
cc9da6cc
BM		 3134static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3135{
3136 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3137
3138 if (s->initialized)
3139 return;
3140 s = &idev->cnf.stable_secret;
3141 get_random_bytes(&s->secret, sizeof(s->secret));
3142 s->initialized = true;
3143}
3144
bc91b0f0
JP		 3145static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3146{
622c81d5
HFS		 3147 struct in6_addr addr;
3148
ca254490
DA		 3149 /* no link local addresses on L3 master devices */
3150 if (netif_is_l3_master(idev->dev))
3151 return;
3152
622c81d5 3153 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3154
cc9da6cc
BM		 3155 switch (idev->addr_gen_mode) {
3156 case IN6_ADDR_GEN_MODE_RANDOM:
3157 ipv6_gen_mode_random_init(idev);
3158 /* fallthrough */
3159 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3160 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3161 addrconf_add_linklocal(idev, &addr,
3162 IFA_F_STABLE_PRIVACY);
622c81d5
HFS		 3163 else if (prefix_route)
3164 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3165 break;
3166 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3167 /* addrconf_add_linklocal also adds a prefix_route and we
3168 * only need to care about prefix routes if ipv6_generate_eui64
3169 * couldn't generate one.
3170 */
3171 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3172 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0
JP		 3173 else if (prefix_route)
3174 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3175 break;
3176 case IN6_ADDR_GEN_MODE_NONE:
3177 default:
3178 /* will not add any link local address */
3179 break;
bc91b0f0
JP		 3180 }
3181}
3182
1da177e4
LT		 3183static void addrconf_dev_config(struct net_device *dev)
3184{
8e5e8f30 3185 struct inet6_dev *idev;
1da177e4
LT		 3186
3187 ASSERT_RTNL();
3188
74235a25
HX		 3189 if ((dev->type != ARPHRD_ETHER) &&
3190 (dev->type != ARPHRD_FDDI) &&
74235a25 3191 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3192 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3193 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3194 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc
BM		 3195 (dev->type != ARPHRD_6LOWPAN) &&
3196 (dev->type != ARPHRD_NONE)) {
74235a25
HX		 3197 /* Alas, we support only Ethernet autoconfiguration. */
3198 return;
3199 }
3200
1da177e4 3201 idev = addrconf_add_dev(dev);
64e724f6 3202 if (IS_ERR(idev))
1da177e4
LT		 3203 return;
3204
cc9da6cc
BM		 3205 /* this device type has no EUI support */
3206 if (dev->type == ARPHRD_NONE &&
3207 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3208 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3209
bc91b0f0 3210 addrconf_addr_gen(idev, false);
1da177e4
LT		 3211}
3212
07a93626 3213#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3214static void addrconf_sit_config(struct net_device *dev)
3215{
3216 struct inet6_dev *idev;
3217
3218 ASSERT_RTNL();
3219
1ab1457c
YH		 3220 /*
3221 * Configure the tunnel with one of our IPv4
3222 * addresses... we should configure all of
1da177e4
LT		 3223 * our v4 addrs in the tunnel
3224 */
3225
e5d08d71 3226 idev = ipv6_find_idev(dev);
63159f29 3227 if (!idev) {
91df42be 3228 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3229 return;
3230 }
3231
c7dc89c0 3232 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3233 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3234 return;
3235 }
3236
1da177e4
LT		 3237 sit_add_v4_addrs(idev);
3238
62b54dd9 3239 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3240 addrconf_add_mroute(dev);
1da177e4 3241}
0be669bb 3242#endif
1da177e4 3243
07a93626 3244#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3245static void addrconf_gre_config(struct net_device *dev)
3246{
3247 struct inet6_dev *idev;
aee80b54 3248
aee80b54 3249 ASSERT_RTNL();
3250
e5d08d71 3251 idev = ipv6_find_idev(dev);
63159f29 3252 if (!idev) {
91df42be 3253 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3254 return;
3255 }
3256
bc91b0f0 3257 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3258 if (dev->flags & IFF_POINTOPOINT)
3259 addrconf_add_mroute(dev);
aee80b54 3260}
3261#endif
3262
f1705ec1
DA		 3263static int fixup_permanent_addr(struct inet6_dev *idev,
3264 struct inet6_ifaddr *ifp)
3265{
3266 if (!ifp->rt) {
3267 struct rt6_info *rt;
3268
3269 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3270 if (unlikely(IS_ERR(rt)))
3271 return PTR_ERR(rt);
3272
3273 ifp->rt = rt;
3274 }
3275
3276 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3277 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3278 idev->dev, 0, 0);
3279 }
3280
3281 addrconf_dad_start(ifp);
3282
3283 return 0;
3284}
3285
3286static void addrconf_permanent_addr(struct net_device *dev)
3287{
3288 struct inet6_ifaddr *ifp, *tmp;
3289 struct inet6_dev *idev;
3290
3291 idev = __in6_dev_get(dev);
3292 if (!idev)
3293 return;
3294
3295 write_lock_bh(&idev->lock);
3296
3297 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3298 if ((ifp->flags & IFA_F_PERMANENT) &&
3299 fixup_permanent_addr(idev, ifp) < 0) {
3300 write_unlock_bh(&idev->lock);
3301 ipv6_del_addr(ifp);
3302 write_lock_bh(&idev->lock);
3303
3304 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3305 idev->dev->name, &ifp->addr);
3306 }
3307 }
3308
3309 write_unlock_bh(&idev->lock);
3310}
3311
1ab1457c 3312static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3313 void *ptr)
1da177e4 3314{
351638e7 3315 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4f7f34ea 3316 struct netdev_notifier_changeupper_info *info;
748e2d93 3317 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 3318 int run_pending = 0;
b217d616 3319 int err;
1da177e4 3320
e21e8467 3321 switch (event) {
45ba9dd2 3322 case NETDEV_REGISTER:
74235a25 3323 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3324 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3325 if (IS_ERR(idev))
3326 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3327 }
3328 break;
bcdd553f 3329
b7b0b1d2
AD		 3330 case NETDEV_CHANGEMTU:
3331 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3332 if (dev->mtu < IPV6_MIN_MTU) {
3333 addrconf_ifdown(dev, 1);
3334 break;
3335 }
3336
3337 if (idev) {
3338 rt6_mtu_change(dev, dev->mtu);
3339 idev->cnf.mtu6 = dev->mtu;
3340 break;
3341 }
3342
3343 /* allocate new idev */
3344 idev = ipv6_add_dev(dev);
3345 if (IS_ERR(idev))
3346 break;
3347
3348 /* device is still not ready */
3349 if (!(idev->if_flags & IF_READY))
3350 break;
3351
3352 run_pending = 1;
3353
3354 /* fall through */
3355
1da177e4 3356 case NETDEV_UP:
3c21edbd 3357 case NETDEV_CHANGE:
c2edacf8
JV		 3358 if (dev->flags & IFF_SLAVE)
3359 break;
3360
3ce62a84
WC		 3361 if (idev && idev->cnf.disable_ipv6)
3362 break;
3363
3c21edbd 3364 if (event == NETDEV_UP) {
38bd10c4
DA		 3365 /* restore routes for permanent addresses */
3366 addrconf_permanent_addr(dev);
3367
f24e3d65 3368 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 3369 /* device is not ready yet. */
f3213831 3370 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3371 dev->name);
3372 break;
3373 }
99081049 3374
d31c7b8f
EP		 3375 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3376 idev = ipv6_add_dev(dev);
3377
a317a2f1 3378 if (!IS_ERR_OR_NULL(idev)) {
99081049 3379 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3380 run_pending = 1;
3381 }
b7b0b1d2 3382 } else if (event == NETDEV_CHANGE) {
f24e3d65 3383 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 3384 /* device is still not ready. */
3385 break;
3386 }
3387
3388 if (idev) {
a088d1d7
LL		 3389 if (idev->if_flags & IF_READY) {
3390 /* device is already configured -
3391 * but resend MLD reports, we might
3392 * have roamed and need to update
3393 * multicast snooping switches
3394 */
3395 ipv6_mc_up(idev);
3c21edbd 3396 break;
a088d1d7 3397 }
3c21edbd
YH		 3398 idev->if_flags |= IF_READY;
3399 }
3400
f3213831
JP		 3401 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3402 dev->name);
3c21edbd 3403
c5e33bdd 3404 run_pending = 1;
3c21edbd
YH		 3405 }
3406
e21e8467 3407 switch (dev->type) {
07a93626 3408#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3409 case ARPHRD_SIT:
3410 addrconf_sit_config(dev);
3411 break;
aee80b54 3412#endif
07a93626 3413#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3414 case ARPHRD_IPGRE:
3415 addrconf_gre_config(dev);
3416 break;
0be669bb 3417#endif
1da177e4
LT		 3418 case ARPHRD_LOOPBACK:
3419 init_loopback(dev);
3420 break;
3421
3422 default:
3423 addrconf_dev_config(dev);
3424 break;
3ff50b79 3425 }
bcdd553f 3426
a317a2f1 3427 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3428 if (run_pending)
3429 addrconf_dad_run(idev);
3430
bcdd553f
SH		 3431 /*
3432 * If the MTU changed during the interface down,
3433 * when the interface up, the changed MTU must be
3434 * reflected in the idev as well as routers.
1da177e4 3435 */
bcdd553f
SH		 3436 if (idev->cnf.mtu6 != dev->mtu &&
3437 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3438 rt6_mtu_change(dev, dev->mtu);
3439 idev->cnf.mtu6 = dev->mtu;
3440 }
3441 idev->tstamp = jiffies;
3442 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3443
3444 /*
3445 * If the changed mtu during down is lower than
3446 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3447 */
3448 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 3449 addrconf_ifdown(dev, 1);
1da177e4
LT		 3450 }
3451 break;
3452
1da177e4
LT		 3453 case NETDEV_DOWN:
3454 case NETDEV_UNREGISTER:
3455 /*
3456 * Remove all addresses from this interface.
3457 */
3458 addrconf_ifdown(dev, event != NETDEV_DOWN);
3459 break;
3c21edbd 3460
1da177e4 3461 case NETDEV_CHANGENAME:
1da177e4 3462 if (idev) {
5632c515 3463 snmp6_unregister_dev(idev);
408c4768 3464 addrconf_sysctl_unregister(idev);
a317a2f1 3465 err = addrconf_sysctl_register(idev);
b217d616
HX		 3466 if (err)
3467 return notifier_from_errno(err);
a317a2f1
WC		 3468 err = snmp6_register_dev(idev);
3469 if (err) {
3470 addrconf_sysctl_unregister(idev);
3471 return notifier_from_errno(err);
3472 }
5632c515 3473 }
1da177e4 3474 break;
bcdd553f 3475
93d9b7d7
JP		 3476 case NETDEV_PRE_TYPE_CHANGE:
3477 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3478 if (idev)
3479 addrconf_type_change(dev, event);
75c78500 3480 break;
4f7f34ea
DA		 3481
3482 case NETDEV_CHANGEUPPER:
3483 info = ptr;
3484
3485 /* flush all routes if dev is linked to or unlinked from
3486 * an L3 master device (e.g., VRF)
3487 */
3488 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3489 addrconf_ifdown(dev, 0);
3ff50b79 3490 }
1da177e4
LT		 3491
3492 return NOTIFY_OK;
3493}
3494
3495/*
3496 * addrconf module should be notified of a device going up
3497 */
3498static struct notifier_block ipv6_dev_notf = {
3499 .notifier_call = addrconf_notify,
1da177e4
LT		 3500};
3501
93d9b7d7 3502static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3503{
3504 struct inet6_dev *idev;
3505 ASSERT_RTNL();
3506
3507 idev = __in6_dev_get(dev);
3508
93d9b7d7 3509 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3510 ipv6_mc_remap(idev);
93d9b7d7 3511 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3512 ipv6_mc_unmap(idev);
3513}
3514
70af921d
DA		 3515static bool addr_is_local(const struct in6_addr *addr)
3516{
3517 return ipv6_addr_type(addr) &
3518 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3519}
3520
1da177e4
LT		 3521static int addrconf_ifdown(struct net_device *dev, int how)
3522{
c346dca1 3523 struct net *net = dev_net(dev);
502a2ffd 3524 struct inet6_dev *idev;
f1705ec1
DA		 3525 struct inet6_ifaddr *ifa, *tmp;
3526 struct list_head del_list;
3527 int _keep_addr;
3528 bool keep_addr;
73a8bd74 3529 int state, i;
1da177e4
LT		 3530
3531 ASSERT_RTNL();
3532
73a8bd74
DM		 3533 rt6_ifdown(net, dev);
3534 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3535
3536 idev = __in6_dev_get(dev);
63159f29 3537 if (!idev)
1da177e4
LT		 3538 return -ENODEV;
3539
bcdd553f
SH		 3540 /*
3541 * Step 1: remove reference to ipv6 device from parent device.
3542 * Do not dev_put!
1da177e4 3543 */
439e2385 3544 if (how) {
1da177e4 3545 idev->dead = 1;
8814c4b5
YH		 3546
3547 /* protected by rtnl_lock */
a9b3cd7f 3548 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3549
3550 /* Step 1.5: remove snmp6 entry */
3551 snmp6_unregister_dev(idev);
3552
3553 }
3554
f1705ec1
DA		 3555 /* aggregate the system setting and interface setting */
3556 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3557 if (!_keep_addr)
3558 _keep_addr = idev->cnf.keep_addr_on_down;
3559
3560 /* combine the user config with event to determine if permanent
3561 * addresses are to be removed from address hash table
3562 */
bc561632 3563 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
f1705ec1 3564
73a8bd74
DM		 3565 /* Step 2: clear hash table */
3566 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3567 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3568
3569 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3570restart:
b67bfe0d 3571 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3572 if (ifa->idev == idev) {
c15b1cca 3573 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3574 /* combined flag + permanent flag decide if
3575 * address is retained on a down event
3576 */
3577 if (!keep_addr ||
70af921d
DA		 3578 !(ifa->flags & IFA_F_PERMANENT) ||
3579 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3580 hlist_del_init_rcu(&ifa->addr_lst);
3581 goto restart;
3582 }
73a8bd74
DM		 3583 }
3584 }
3585 spin_unlock_bh(&addrconf_hash_lock);
3586 }
3587
1da177e4
LT		 3588 write_lock_bh(&idev->lock);
3589
b7b1bfce
HFS		 3590 addrconf_del_rs_timer(idev);
3591
bcdd553f 3592 /* Step 2: clear flags for stateless addrconf */
439e2385 3593 if (!how)
3c21edbd 3594 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3595
bcdd553f 3596 /* Step 3: clear tempaddr list */
372e6c8f 3597 while (!list_empty(&idev->tempaddr_list)) {
3598 ifa = list_first_entry(&idev->tempaddr_list,
3599 struct inet6_ifaddr, tmp_list);
3600 list_del(&ifa->tmp_list);
1da177e4
LT		 3601 write_unlock_bh(&idev->lock);
3602 spin_lock_bh(&ifa->lock);
3603
3604 if (ifa->ifpub) {
3605 in6_ifa_put(ifa->ifpub);
3606 ifa->ifpub = NULL;
3607 }
3608 spin_unlock_bh(&ifa->lock);
3609 in6_ifa_put(ifa);
3610 write_lock_bh(&idev->lock);
3611 }
8f37ada5 3612
f1705ec1
DA		 3613 /* re-combine the user config with event to determine if permanent
3614 * addresses are to be removed from the interface list
3615 */
bc561632 3616 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
84e8b803 3617
f1705ec1
DA		 3618 INIT_LIST_HEAD(&del_list);
3619 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
38bd10c4
DA		 3620 struct rt6_info *rt = NULL;
3621
f1705ec1 3622 addrconf_del_dad_work(ifa);
84e8b803 3623
73a8bd74 3624 write_unlock_bh(&idev->lock);
8e8e676d 3625 spin_lock_bh(&ifa->lock);
f1705ec1 3626
70af921d
DA		 3627 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3628 !addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3629 /* set state to skip the notifier below */
3630 state = INET6_IFADDR_STATE_DEAD;
3631 ifa->state = 0;
3632 if (!(ifa->flags & IFA_F_NODAD))
3633 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3634
3635 rt = ifa->rt;
3636 ifa->rt = NULL;
f1705ec1
DA		 3637 } else {
3638 state = ifa->state;
3639 ifa->state = INET6_IFADDR_STATE_DEAD;
3640
c882219a 3641 list_move(&ifa->if_list, &del_list);
f1705ec1
DA		 3642 }
3643
8e8e676d 3644 spin_unlock_bh(&ifa->lock);
9d82ca98 3645
38bd10c4
DA		 3646 if (rt)
3647 ip6_del_rt(rt);
3648
73a8bd74
DM		 3649 if (state != INET6_IFADDR_STATE_DEAD) {
3650 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3651 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
ea06f717
MM		 3652 } else {
3653 if (idev->cnf.forwarding)
3654 addrconf_leave_anycast(ifa);
3655 addrconf_leave_solict(ifa->idev, &ifa->addr);
27bdb2ab 3656 }
8f37ada5 3657
73a8bd74
DM		 3658 write_lock_bh(&idev->lock);
3659 }
8f37ada5 3660
1da177e4
LT		 3661 write_unlock_bh(&idev->lock);
3662
f1705ec1
DA		 3663 /* now clean up addresses to be removed */
3664 while (!list_empty(&del_list)) {
3665 ifa = list_first_entry(&del_list,
3666 struct inet6_ifaddr, if_list);
3667 list_del(&ifa->if_list);
3668
3669 in6_ifa_put(ifa);
3670 }
3671
381f4dca
SD		 3672 /* Step 5: Discard anycast and multicast list */
3673 if (how) {
3674 ipv6_ac_destroy_dev(idev);
1da177e4 3675 ipv6_mc_destroy_dev(idev);
381f4dca 3676 } else {
1da177e4 3677 ipv6_mc_down(idev);
381f4dca 3678 }
1da177e4 3679
1da177e4 3680 idev->tstamp = jiffies;
1ab1457c 3681
bcdd553f 3682 /* Last: Shot the device (if unregistered) */
439e2385 3683 if (how) {
408c4768 3684 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3685 neigh_parms_release(&nd_tbl, idev->nd_parms);
3686 neigh_ifdown(&nd_tbl, dev);
3687 in6_dev_put(idev);
3688 }
3689 return 0;
3690}
3691
3692static void addrconf_rs_timer(unsigned long data)
3693{
b7b1bfce 3694 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3695 struct net_device *dev = idev->dev;
b7b1bfce 3696 struct in6_addr lladdr;
1da177e4 3697
b7b1bfce 3698 write_lock(&idev->lock);
5b2a1953 3699 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3700 goto out;
3701
9ba2add3 3702 if (!ipv6_accept_ra(idev))
5b2a1953 3703 goto out;
3704
3705 /* Announcement received after solicitation was sent */
3706 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3707 goto out;
1da177e4 3708
bd11f074 3709 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
caf92bc4
CW		 3710 write_unlock(&idev->lock);
3711 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3712 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3713 &in6addr_linklocal_allrouters);
3714 else
caf92bc4 3715 goto put;
1da177e4 3716
caf92bc4 3717 write_lock(&idev->lock);
bd11f074
MŻ		 3718 idev->rs_interval = rfc3315_s14_backoff_update(
3719 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
b7b1bfce
HFS		 3720 /* The wait after the last probe can be shorter */
3721 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3722 idev->cnf.rtr_solicits) ?
3723 idev->cnf.rtr_solicit_delay :
bd11f074 3724 idev->rs_interval);
1da177e4 3725 } else {
1da177e4
LT		 3726 /*
3727 * Note: we do not support deprecated "all on-link"
3728 * assumption any longer.
3729 */
91df42be 3730 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3731 }
3732
3733out:
b7b1bfce 3734 write_unlock(&idev->lock);
caf92bc4 3735put:
b7b1bfce 3736 in6_dev_put(idev);
1da177e4
LT		 3737}
3738
3739/*
3740 * Duplicate Address Detection
3741 */
3c21edbd
YH		 3742static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3743{
3744 unsigned long rand_num;
3745 struct inet6_dev *idev = ifp->idev;
adc176c5 3746 u64 nonce;
3c21edbd 3747
95c385b4
NH		 3748 if (ifp->flags & IFA_F_OPTIMISTIC)
3749 rand_num = 0;
3750 else
63862b5b 3751 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3752
adc176c5
EN		 3753 nonce = 0;
3754 if (idev->cnf.enhanced_dad ||
3755 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3756 do
3757 get_random_bytes(&nonce, 6);
3758 while (nonce == 0);
3759 }
3760 ifp->dad_nonce = nonce;
b7b1bfce 3761 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3762 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3763}
3764
c15b1cca 3765static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3766{
3767 struct inet6_dev *idev = ifp->idev;
3768 struct net_device *dev = idev->dev;
764d3be6 3769 bool bump_id, notify = false;
1da177e4
LT		 3770
3771 addrconf_join_solict(dev, &ifp->addr);
3772
63862b5b 3773 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3774
3775 read_lock_bh(&idev->lock);
622ccdf1 3776 spin_lock(&ifp->lock);
e9d3e084 3777 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3778 goto out;
1da177e4
LT		 3779
3780 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3781 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3782 !(ifp->flags&IFA_F_TENTATIVE) ||
3783 ifp->flags & IFA_F_NODAD) {
764d3be6 3784 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3785 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3786 spin_unlock(&ifp->lock);
1da177e4
LT		 3787 read_unlock_bh(&idev->lock);
3788
764d3be6 3789 addrconf_dad_completed(ifp, bump_id);
1da177e4
LT		 3790 return;
3791 }
3792
6732bade 3793 if (!(idev->if_flags & IF_READY)) {
21809faf 3794 spin_unlock(&ifp->lock);
6732bade 3795 read_unlock_bh(&idev->lock);
3c21edbd 3796 /*
590a9887 3797 * If the device is not ready:
3c21edbd
YH		 3798 * - keep it tentative if it is a permanent address.
3799 * - otherwise, kill it.
3800 */
3801 in6_ifa_hold(ifp);
cc411d0b 3802 addrconf_dad_stop(ifp, 0);
6732bade 3803 return;
3c21edbd 3804 }
95c385b4
NH		 3805
3806 /*
3807 * Optimistic nodes can start receiving
3808 * Frames right away
3809 */
7fd2561e 3810 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3811 ip6_ins_rt(ifp->rt);
7fd2561e
EK		 3812 if (ipv6_use_optimistic_addr(idev)) {
3813 /* Because optimistic nodes can use this address,
3814 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3815 */
16186a82 3816 notify = true;
7fd2561e
EK		 3817 }
3818 }
95c385b4 3819
6732bade 3820 addrconf_dad_kick(ifp);
1da177e4 3821out:
622ccdf1 3822 spin_unlock(&ifp->lock);
1da177e4 3823 read_unlock_bh(&idev->lock);
16186a82
SAK		 3824 if (notify)
3825 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 3826}
3827
c15b1cca 3828static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3829{
c15b1cca
HFS		 3830 bool begin_dad = false;
3831
8e8e676d 3832 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3833 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3834 ifp->state = INET6_IFADDR_STATE_PREDAD;
3835 begin_dad = true;
3836 }
8e8e676d 3837 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3838
3839 if (begin_dad)
3840 addrconf_mod_dad_work(ifp, 0);
3841}
3842
3843static void addrconf_dad_work(struct work_struct *w)
3844{
3845 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3846 struct inet6_ifaddr,
3847 dad_work);
1da177e4 3848 struct inet6_dev *idev = ifp->idev;
764d3be6 3849 bool bump_id, disable_ipv6 = false;
1da177e4
LT		 3850 struct in6_addr mcaddr;
3851
c15b1cca
HFS		 3852 enum {
3853 DAD_PROCESS,
3854 DAD_BEGIN,
3855 DAD_ABORT,
3856 } action = DAD_PROCESS;
3857
3858 rtnl_lock();
3859
8e8e676d 3860 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3861 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3862 action = DAD_BEGIN;
3863 ifp->state = INET6_IFADDR_STATE_DAD;
3864 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3865 action = DAD_ABORT;
3866 ifp->state = INET6_IFADDR_STATE_POSTDAD;
85b51b12
MM		 3867
3868 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3869 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3870 struct in6_addr addr;
3871
3872 addr.s6_addr32[0] = htonl(0xfe800000);
3873 addr.s6_addr32[1] = 0;
3874
3875 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3876 ipv6_addr_equal(&ifp->addr, &addr)) {
3877 /* DAD failed for link-local based on MAC */
3878 idev->cnf.disable_ipv6 = 1;
3879
3880 pr_info("%s: IPv6 being disabled!\n",
3881 ifp->idev->dev->name);
3882 disable_ipv6 = true;
3883 }
3884 }
c15b1cca 3885 }
8e8e676d 3886 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3887
3888 if (action == DAD_BEGIN) {
3889 addrconf_dad_begin(ifp);
3890 goto out;
3891 } else if (action == DAD_ABORT) {
751eb6b6 3892 in6_ifa_hold(ifp);
c15b1cca 3893 addrconf_dad_stop(ifp, 1);
85b51b12
MM		 3894 if (disable_ipv6)
3895 addrconf_ifdown(idev->dev, 0);
c15b1cca
HFS		 3896 goto out;
3897 }
3898
b7b1bfce 3899 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3900 goto out;
3901
c15b1cca 3902 write_lock_bh(&idev->lock);
122e4519 3903 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3904 write_unlock_bh(&idev->lock);
1da177e4
LT		 3905 goto out;
3906 }
21809faf 3907
3908 spin_lock(&ifp->lock);
622ccdf1
HX		 3909 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3910 spin_unlock(&ifp->lock);
c15b1cca 3911 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3912 goto out;
3913 }
3914
b7b1bfce 3915 if (ifp->dad_probes == 0) {
1da177e4
LT		 3916 /*
3917 * DAD was successful
3918 */
3919
764d3be6 3920 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3921 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3922 spin_unlock(&ifp->lock);
c15b1cca 3923 write_unlock_bh(&idev->lock);
1da177e4 3924
764d3be6 3925 addrconf_dad_completed(ifp, bump_id);
1da177e4
LT		 3926
3927 goto out;
3928 }
3929
b7b1bfce 3930 ifp->dad_probes--;
c15b1cca
HFS		 3931 addrconf_mod_dad_work(ifp,
3932 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3933 spin_unlock(&ifp->lock);
c15b1cca 3934 write_unlock_bh(&idev->lock);
1da177e4
LT		 3935
3936 /* send a neighbour solicitation for our addr */
1da177e4 3937 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
adc176c5
EN		 3938 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
3939 ifp->dad_nonce);
1da177e4
LT		 3940out:
3941 in6_ifa_put(ifp);
c15b1cca 3942 rtnl_unlock();
1da177e4
LT		 3943}
3944
11ffff75
HFS		 3945/* ifp->idev must be at least read locked */
3946static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3947{
3948 struct inet6_ifaddr *ifpiter;
3949 struct inet6_dev *idev = ifp->idev;
3950
602582ca
HFS		 3951 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3952 if (ifpiter->scope > IFA_LINK)
3953 break;
11ffff75
HFS		 3954 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3955 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3956 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3957 IFA_F_PERMANENT)
3958 return false;
3959 }
3960 return true;
3961}
3962
764d3be6 3963static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id)
1da177e4 3964{
e21e8467 3965 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3966 struct in6_addr lladdr;
b173ee48 3967 bool send_rs, send_mld;
b7b1bfce 3968
c15b1cca 3969 addrconf_del_dad_work(ifp);
1da177e4
LT		 3970
3971 /*
3972 * Configure the address for reception. Now it is valid.
3973 */
3974
3975 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3976
026359bc
TA		 3977 /* If added prefix is link local and we are prepared to process
3978 router advertisements, start sending router solicitations.
1da177e4
LT		 3979 */
3980
1ec047eb 3981 read_lock_bh(&ifp->idev->lock);
11ffff75 3982 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 3983 send_rs = send_mld &&
3984 ipv6_accept_ra(ifp->idev) &&
bd11f074 3985 ifp->idev->cnf.rtr_solicits != 0 &&
b173ee48 3986 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 3987 read_unlock_bh(&ifp->idev->lock);
3988
b173ee48
HFS		 3989 /* While dad is in progress mld report's source address is in6_addrany.
3990 * Resend with proper ll now.
3991 */
3992 if (send_mld)
3993 ipv6_mc_dad_complete(ifp->idev);
3994
1ec047eb 3995 if (send_rs) {
1da177e4
LT		 3996 /*
3997 * If a host as already performed a random delay
3998 * [...] as part of DAD [...] there is no need
3999 * to delay again before sending the first RS
4000 */
1ec047eb 4001 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 4002 return;
1ec047eb 4003 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 4004
b7b1bfce
HFS		 4005 write_lock_bh(&ifp->idev->lock);
4006 spin_lock(&ifp->lock);
bd11f074
MŻ		 4007 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4008 ifp->idev->cnf.rtr_solicit_interval);
b7b1bfce 4009 ifp->idev->rs_probes = 1;
1da177e4 4010 ifp->idev->if_flags |= IF_RS_SENT;
bd11f074 4011 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
b7b1bfce
HFS		 4012 spin_unlock(&ifp->lock);
4013 write_unlock_bh(&ifp->idev->lock);
1da177e4 4014 }
764d3be6
PA		 4015
4016 if (bump_id)
4017 rt_genid_bump_ipv6(dev_net(dev));
1da177e4
LT		 4018}
4019
e21e8467
SH		 4020static void addrconf_dad_run(struct inet6_dev *idev)
4021{
c5e33bdd
YH		 4022 struct inet6_ifaddr *ifp;
4023
4024 read_lock_bh(&idev->lock);
502a2ffd 4025 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 4026 spin_lock(&ifp->lock);
f2344a13
HX		 4027 if (ifp->flags & IFA_F_TENTATIVE &&
4028 ifp->state == INET6_IFADDR_STATE_DAD)
4029 addrconf_dad_kick(ifp);
21809faf 4030 spin_unlock(&ifp->lock);
c5e33bdd
YH		 4031 }
4032 read_unlock_bh(&idev->lock);
4033}
4034
1da177e4
LT		 4035#ifdef CONFIG_PROC_FS
4036struct if6_iter_state {
3c40090a 4037 struct seq_net_private p;
1da177e4 4038 int bucket;
1d578303 4039 int offset;
1da177e4
LT		 4040};
4041
1d578303 4042static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 4043{
4044 struct inet6_ifaddr *ifa = NULL;
4045 struct if6_iter_state *state = seq->private;
1218854a 4046 struct net *net = seq_file_net(seq);
1d578303 4047 int p = 0;
1da177e4 4048
1d578303
MM		 4049 /* initial bucket if pos is 0 */
4050 if (pos == 0) {
4051 state->bucket = 0;
4052 state->offset = 0;
4053 }
4054
4055 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 4056 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 4057 addr_lst) {
9f0d3c27
ED		 4058 if (!net_eq(dev_net(ifa->idev->dev), net))
4059 continue;
1d578303
MM		 4060 /* sync with offset */
4061 if (p < state->offset) {
4062 p++;
4063 continue;
4064 }
4065 state->offset++;
9f0d3c27 4066 return ifa;
1d578303
MM		 4067 }
4068
4069 /* prepare for next bucket */
4070 state->offset = 0;
4071 p = 0;
1da177e4 4072 }
c2e21293 4073 return NULL;
1da177e4
LT		 4074}
4075
c2e21293 4076static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4077 struct inet6_ifaddr *ifa)
1da177e4
LT		 4078{
4079 struct if6_iter_state *state = seq->private;
1218854a 4080 struct net *net = seq_file_net(seq);
1da177e4 4081
b67bfe0d 4082 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 4083 if (!net_eq(dev_net(ifa->idev->dev), net))
4084 continue;
1d578303 4085 state->offset++;
9f0d3c27 4086 return ifa;
1d578303 4087 }
3c40090a 4088
c2e21293 4089 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 4090 state->offset = 0;
b67bfe0d 4091 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 4092 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 4093 if (!net_eq(dev_net(ifa->idev->dev), net))
4094 continue;
1d578303 4095 state->offset++;
9f0d3c27 4096 return ifa;
c2e21293 4097 }
1da177e4 4098 }
3c40090a 4099
c2e21293 4100 return NULL;
1da177e4
LT		 4101}
4102
1da177e4 4103static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 4104 __acquires(rcu_bh)
1da177e4 4105{
5c578aed 4106 rcu_read_lock_bh();
1d578303 4107 return if6_get_first(seq, *pos);
1da177e4
LT		 4108}
4109
4110static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4111{
4112 struct inet6_ifaddr *ifa;
4113
4114 ifa = if6_get_next(seq, v);
4115 ++*pos;
4116 return ifa;
4117}
4118
4119static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 4120 __releases(rcu_bh)
1da177e4 4121{
5c578aed 4122 rcu_read_unlock_bh();
1da177e4
LT		 4123}
4124
4125static int if6_seq_show(struct seq_file *seq, void *v)
4126{
4127 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4128 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4129 &ifp->addr,
1da177e4
LT		 4130 ifp->idev->dev->ifindex,
4131 ifp->prefix_len,
4132 ifp->scope,
971a351c 4133 (u8) ifp->flags,
1da177e4
LT		 4134 ifp->idev->dev->name);
4135 return 0;
4136}
4137
56b3d975 4138static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4139 .start = if6_seq_start,
4140 .next = if6_seq_next,
4141 .show = if6_seq_show,
4142 .stop = if6_seq_stop,
4143};
4144
4145static int if6_seq_open(struct inode *inode, struct file *file)
4146{
3c40090a
DL		 4147 return seq_open_net(inode, file, &if6_seq_ops,
4148 sizeof(struct if6_iter_state));
1da177e4
LT		 4149}
4150
9a32144e 4151static const struct file_operations if6_fops = {
1da177e4
LT		 4152 .owner = THIS_MODULE,
4153 .open = if6_seq_open,
4154 .read = seq_read,
4155 .llseek = seq_lseek,
3c40090a 4156 .release = seq_release_net,
1da177e4
LT		 4157};
4158
2c8c1e72 4159static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4160{
d4beaa66 4161 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 4162 return -ENOMEM;
4163 return 0;
4164}
4165
2c8c1e72 4166static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4167{
ece31ffd 4168 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4169}
4170
4171static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4172 .init = if6_proc_net_init,
4173 .exit = if6_proc_net_exit,
3c40090a
DL		 4174};
4175
4176int __init if6_proc_init(void)
4177{
4178 return register_pernet_subsys(&if6_proc_net_ops);
4179}
4180
1da177e4
LT		 4181void if6_proc_exit(void)
4182{
3c40090a 4183 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4184}
4185#endif /* CONFIG_PROC_FS */
4186
07a93626 4187#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4188/* Check if address is a home address configured on any interface. */
b71d1d42 4189int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 4190{
4191 int ret = 0;
c2e21293 4192 struct inet6_ifaddr *ifp = NULL;
ddbe5032 4193 unsigned int hash = inet6_addr_hash(addr);
c2e21293 4194
5c578aed 4195 rcu_read_lock_bh();
b67bfe0d 4196 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 4197 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 4198 continue;
caad295f 4199 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4200 (ifp->flags & IFA_F_HOMEADDRESS)) {
4201 ret = 1;
4202 break;
4203 }
4204 }
5c578aed 4205 rcu_read_unlock_bh();
3b9f9a1c
NT		 4206 return ret;
4207}
4208#endif
4209
1da177e4
LT		 4210/*
4211 * Periodic address status verification
4212 */
4213
c15b1cca 4214static void addrconf_verify_rtnl(void)
1da177e4 4215{
b2db7564 4216 unsigned long now, next, next_sec, next_sched;
1da177e4 4217 struct inet6_ifaddr *ifp;
1da177e4
LT		 4218 int i;
4219
c15b1cca
HFS		 4220 ASSERT_RTNL();
4221
5c578aed 4222 rcu_read_lock_bh();
1da177e4 4223 now = jiffies;
b2db7564 4224 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4225
c15b1cca 4226 cancel_delayed_work(&addr_chk_work);
1da177e4 4227
bcdd553f 4228 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4229restart:
c15b1cca 4230 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 4231 unsigned long age;
1da177e4 4232
fad8da3e
YA		 4233 /* When setting preferred_lft to a value not zero or
4234 * infinity, while valid_lft is infinity
4235 * IFA_F_PERMANENT has a non-infinity life time.
4236 */
4237 if ((ifp->flags & IFA_F_PERMANENT) &&
4238 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4239 continue;
4240
4241 spin_lock(&ifp->lock);
b2db7564
YH		 4242 /* We try to batch several events at once. */
4243 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4244
8f27ebb9
YH		 4245 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4246 age >= ifp->valid_lft) {
1da177e4
LT		 4247 spin_unlock(&ifp->lock);
4248 in6_ifa_hold(ifp);
1da177e4
LT		 4249 ipv6_del_addr(ifp);
4250 goto restart;
8f27ebb9
YH		 4251 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4252 spin_unlock(&ifp->lock);
4253 continue;
1da177e4 4254 } else if (age >= ifp->prefered_lft) {
a1ed0526 4255 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4256 int deprecate = 0;
4257
4258 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4259 deprecate = 1;
4260 ifp->flags |= IFA_F_DEPRECATED;
4261 }
4262
fad8da3e
YA		 4263 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4264 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4265 next = ifp->tstamp + ifp->valid_lft * HZ;
4266
4267 spin_unlock(&ifp->lock);
4268
4269 if (deprecate) {
4270 in6_ifa_hold(ifp);
1da177e4
LT		 4271
4272 ipv6_ifa_notify(0, ifp);
4273 in6_ifa_put(ifp);
4274 goto restart;
4275 }
1da177e4
LT		 4276 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4277 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4278 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4279 ifp->idev->cnf.dad_transmits *
1f9248e5 4280 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 4281
1da177e4
LT		 4282 if (age >= ifp->prefered_lft - regen_advance) {
4283 struct inet6_ifaddr *ifpub = ifp->ifpub;
4284 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4285 next = ifp->tstamp + ifp->prefered_lft * HZ;
4286 if (!ifp->regen_count && ifpub) {
4287 ifp->regen_count++;
4288 in6_ifa_hold(ifp);
4289 in6_ifa_hold(ifpub);
4290 spin_unlock(&ifp->lock);
5c578aed 4291
291d809b
HY		 4292 spin_lock(&ifpub->lock);
4293 ifpub->regen_count = 0;
4294 spin_unlock(&ifpub->lock);
1da177e4
LT		 4295 ipv6_create_tempaddr(ifpub, ifp);
4296 in6_ifa_put(ifpub);
4297 in6_ifa_put(ifp);
4298 goto restart;
4299 }
4300 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4301 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4302 spin_unlock(&ifp->lock);
1da177e4
LT		 4303 } else {
4304 /* ifp->prefered_lft <= ifp->valid_lft */
4305 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4306 next = ifp->tstamp + ifp->prefered_lft * HZ;
4307 spin_unlock(&ifp->lock);
4308 }
4309 }
1da177e4
LT		 4310 }
4311
b2db7564
YH		 4312 next_sec = round_jiffies_up(next);
4313 next_sched = next;
4314
4315 /* If rounded timeout is accurate enough, accept it. */
4316 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4317 next_sched = next_sec;
4318
4319 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4320 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4321 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4322
ba3542e1 4323 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4324 now, next, next_sec, next_sched);
c15b1cca 4325 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4326 rcu_read_unlock_bh();
1da177e4
LT		 4327}
4328
c15b1cca
HFS		 4329static void addrconf_verify_work(struct work_struct *w)
4330{
4331 rtnl_lock();
4332 addrconf_verify_rtnl();
4333 rtnl_unlock();
4334}
4335
4336static void addrconf_verify(void)
4337{
4338 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4339}
4340
caeaba79
ND		 4341static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4342 struct in6_addr **peer_pfx)
461d8837
TG		 4343{
4344 struct in6_addr *pfx = NULL;
4345
caeaba79
ND		 4346 *peer_pfx = NULL;
4347
461d8837
TG		 4348 if (addr)
4349 pfx = nla_data(addr);
4350
4351 if (local) {
4352 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4353 *peer_pfx = pfx;
4354 pfx = nla_data(local);
461d8837
TG		 4355 }
4356
4357 return pfx;
4358}
4359
ef7c79ed 4360static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4361 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4362 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4363 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4364 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 4365};
4366
1da177e4 4367static int
661d2967 4368inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4369{
3b1e0a65 4370 struct net *net = sock_net(skb->sk);
b933f716
TG		 4371 struct ifaddrmsg *ifm;
4372 struct nlattr *tb[IFA_MAX+1];
caeaba79 4373 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4374 u32 ifa_flags;
b933f716 4375 int err;
1da177e4 4376
b933f716
TG		 4377 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4378 if (err < 0)
4379 return err;
4380
4381 ifm = nlmsg_data(nlh);
caeaba79 4382 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4383 if (!pfx)
1da177e4
LT		 4384 return -EINVAL;
4385
6046d5b4
HK		 4386 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4387
4388 /* We ignore other flags so far. */
4389 ifa_flags &= IFA_F_MANAGETEMPADDR;
4390
4391 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4392 ifm->ifa_prefixlen);
1da177e4
LT		 4393}
4394
479840ff 4395static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 4396 u32 prefered_lft, u32 valid_lft)
081bba5b 4397{
6f704992
YH		 4398 u32 flags;
4399 clock_t expires;
4bed72e4 4400 unsigned long timeout;
53bd6749 4401 bool was_managetempaddr;
5b84efec 4402 bool had_prefixroute;
46d48046 4403
c15b1cca
HFS		 4404 ASSERT_RTNL();
4405
081bba5b
NT		 4406 if (!valid_lft || (prefered_lft > valid_lft))
4407 return -EINVAL;
4408
53bd6749
JP		 4409 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4410 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4411 return -EINVAL;
4412
4bed72e4
YH		 4413 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4414 if (addrconf_finite_timeout(timeout)) {
4415 expires = jiffies_to_clock_t(timeout * HZ);
4416 valid_lft = timeout;
6f704992 4417 flags = RTF_EXPIRES;
4bed72e4
YH		 4418 } else {
4419 expires = 0;
4420 flags = 0;
4421 ifa_flags |= IFA_F_PERMANENT;
6f704992 4422 }
081bba5b 4423
4bed72e4
YH		 4424 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4425 if (addrconf_finite_timeout(timeout)) {
4426 if (timeout == 0)
4427 ifa_flags |= IFA_F_DEPRECATED;
4428 prefered_lft = timeout;
4429 }
081bba5b
NT		 4430
4431 spin_lock_bh(&ifp->lock);
53bd6749 4432 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4433 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4434 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4435 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4436 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4437 IFA_F_NOPREFIXROUTE);
53bd6749 4438 ifp->flags |= ifa_flags;
081bba5b
NT		 4439 ifp->tstamp = jiffies;
4440 ifp->valid_lft = valid_lft;
4441 ifp->prefered_lft = prefered_lft;
4442
4443 spin_unlock_bh(&ifp->lock);
4444 if (!(ifp->flags&IFA_F_TENTATIVE))
4445 ipv6_ifa_notify(0, ifp);
081bba5b 4446
761aac73
TH		 4447 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4448 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4449 expires, flags);
5b84efec
TH		 4450 } else if (had_prefixroute) {
4451 enum cleanup_prefix_rt_t action;
4452 unsigned long rt_expires;
4453
4454 write_lock_bh(&ifp->idev->lock);
4455 action = check_cleanup_prefix_route(ifp, &rt_expires);
4456 write_unlock_bh(&ifp->idev->lock);
4457
4458 if (action != CLEANUP_PREFIX_RT_NOP) {
4459 cleanup_prefix_route(ifp, rt_expires,
4460 action == CLEANUP_PREFIX_RT_DEL);
4461 }
761aac73 4462 }
53bd6749
JP		 4463
4464 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4465 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4466 valid_lft = prefered_lft = 0;
4467 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4468 !was_managetempaddr, jiffies);
4469 }
4470
c15b1cca 4471 addrconf_verify_rtnl();
081bba5b
NT		 4472
4473 return 0;
4474}
4475
1da177e4 4476static int
661d2967 4477inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4478{
3b1e0a65 4479 struct net *net = sock_net(skb->sk);
461d8837
TG		 4480 struct ifaddrmsg *ifm;
4481 struct nlattr *tb[IFA_MAX+1];
caeaba79 4482 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 4483 struct inet6_ifaddr *ifa;
4484 struct net_device *dev;
55ebaef1 4485 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 4486 u32 ifa_flags;
461d8837 4487 int err;
1da177e4 4488
461d8837
TG		 4489 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4490 if (err < 0)
4491 return err;
4492
4493 ifm = nlmsg_data(nlh);
caeaba79 4494 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4495 if (!pfx)
1da177e4
LT		 4496 return -EINVAL;
4497
461d8837 4498 if (tb[IFA_CACHEINFO]) {
0778769d 4499 struct ifa_cacheinfo *ci;
461d8837
TG		 4500
4501 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 4502 valid_lft = ci->ifa_valid;
461d8837
TG		 4503 preferred_lft = ci->ifa_prefered;
4504 } else {
4505 preferred_lft = INFINITY_LIFE_TIME;
4506 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 4507 }
4508
af284937 4509 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4510 if (!dev)
7198f8ce
TG		 4511 return -ENODEV;
4512
479840ff
JP		 4513 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4514
55ebaef1 4515 /* We ignore other flags so far. */
761aac73 4516 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
93a714d6 4517 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
55ebaef1 4518
1cab3da6 4519 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
63159f29 4520 if (!ifa) {
7198f8ce
TG		 4521 /*
4522 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4523 * userspace already relies on not having to provide this.
7198f8ce 4524 */
caeaba79 4525 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 4526 ifm->ifa_prefixlen, ifa_flags,
4527 preferred_lft, valid_lft);
081bba5b
NT		 4528 }
4529
7198f8ce
TG		 4530 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4531 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4532 err = -EEXIST;
4533 else
55ebaef1 4534 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 4535
4536 in6_ifa_put(ifa);
4537
4538 return err;
1da177e4
LT		 4539}
4540
479840ff 4541static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4542 u8 scope, int ifindex)
4543{
4544 struct ifaddrmsg *ifm;
4545
4546 ifm = nlmsg_data(nlh);
4547 ifm->ifa_family = AF_INET6;
4548 ifm->ifa_prefixlen = prefixlen;
4549 ifm->ifa_flags = flags;
4550 ifm->ifa_scope = scope;
4551 ifm->ifa_index = ifindex;
4552}
4553
85486af0
TG		 4554static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4555 unsigned long tstamp, u32 preferred, u32 valid)
4556{
4557 struct ifa_cacheinfo ci;
4558
18a31e1e
TG		 4559 ci.cstamp = cstamp_delta(cstamp);
4560 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4561 ci.ifa_prefered = preferred;
4562 ci.ifa_valid = valid;
4563
4564 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4565}
4566
101bb229
TG		 4567static inline int rt_scope(int ifa_scope)
4568{
4569 if (ifa_scope & IFA_HOST)
4570 return RT_SCOPE_HOST;
4571 else if (ifa_scope & IFA_LINK)
4572 return RT_SCOPE_LINK;
4573 else if (ifa_scope & IFA_SITE)
4574 return RT_SCOPE_SITE;
4575 else
4576 return RT_SCOPE_UNIVERSE;
4577}
4578
0ab6803b
TG		 4579static inline int inet6_ifaddr_msgsize(void)
4580{
339bf98f 4581 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4582 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4583 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4584 + nla_total_size(sizeof(struct ifa_cacheinfo))
4585 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4586}
c5396a31 4587
1da177e4 4588static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4589 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4590{
1da177e4 4591 struct nlmsghdr *nlh;
85486af0 4592 u32 preferred, valid;
1da177e4 4593
15e47304 4594 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4595 if (!nlh)
26932566 4596 return -EMSGSIZE;
0ab6803b 4597
101bb229
TG		 4598 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4599 ifa->idev->dev->ifindex);
4600
fad8da3e
YA		 4601 if (!((ifa->flags&IFA_F_PERMANENT) &&
4602 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4603 preferred = ifa->prefered_lft;
4604 valid = ifa->valid_lft;
4605 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4606 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4607 if (preferred > tval)
4608 preferred -= tval;
4609 else
4610 preferred = 0;
f56619fc
BH		 4611 if (valid != INFINITY_LIFE_TIME) {
4612 if (valid > tval)
4613 valid -= tval;
4614 else
4615 valid = 0;
4616 }
1da177e4
LT		 4617 }
4618 } else {
85486af0
TG		 4619 preferred = INFINITY_LIFE_TIME;
4620 valid = INFINITY_LIFE_TIME;
4621 }
4622
7996c799 4623 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4624 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4625 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4626 goto error;
4627 } else
930345ea 4628 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4629 goto error;
4630
4631 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4632 goto error;
1da177e4 4633
479840ff
JP		 4634 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4635 goto error;
4636
053c095a
JB		 4637 nlmsg_end(skb, nlh);
4638 return 0;
caeaba79
ND		 4639
4640error:
4641 nlmsg_cancel(skb, nlh);
4642 return -EMSGSIZE;
1da177e4
LT		 4643}
4644
4645static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4646 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4647{
1da177e4 4648 struct nlmsghdr *nlh;
101bb229
TG		 4649 u8 scope = RT_SCOPE_UNIVERSE;
4650 int ifindex = ifmca->idev->dev->ifindex;
4651
4652 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4653 scope = RT_SCOPE_SITE;
1da177e4 4654
15e47304 4655 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4656 if (!nlh)
26932566 4657 return -EMSGSIZE;
85486af0 4658
0ab6803b 4659 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4660 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4661 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4662 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4663 nlmsg_cancel(skb, nlh);
4664 return -EMSGSIZE;
4665 }
85486af0 4666
053c095a
JB		 4667 nlmsg_end(skb, nlh);
4668 return 0;
1da177e4
LT		 4669}
4670
4671static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4672 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4673{
1da177e4 4674 struct nlmsghdr *nlh;
101bb229
TG		 4675 u8 scope = RT_SCOPE_UNIVERSE;
4676 int ifindex = ifaca->aca_idev->dev->ifindex;
4677
4678 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4679 scope = RT_SCOPE_SITE;
1da177e4 4680
15e47304 4681 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4682 if (!nlh)
26932566 4683 return -EMSGSIZE;
85486af0 4684
0ab6803b 4685 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4686 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4687 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4688 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4689 nlmsg_cancel(skb, nlh);
4690 return -EMSGSIZE;
4691 }
1da177e4 4692
053c095a
JB		 4693 nlmsg_end(skb, nlh);
4694 return 0;
1da177e4
LT		 4695}
4696
e21e8467 4697enum addr_type_t {
1da177e4
LT		 4698 UNICAST_ADDR,
4699 MULTICAST_ADDR,
4700 ANYCAST_ADDR,
4701};
4702
234b27c3
ED		 4703/* called with rcu_read_lock() */
4704static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4705 struct netlink_callback *cb, enum addr_type_t type,
4706 int s_ip_idx, int *p_ip_idx)
4707{
234b27c3
ED		 4708 struct ifmcaddr6 *ifmca;
4709 struct ifacaddr6 *ifaca;
4710 int err = 1;
4711 int ip_idx = *p_ip_idx;
4712
4713 read_lock_bh(&idev->lock);
4714 switch (type) {
502a2ffd 4715 case UNICAST_ADDR: {
4716 struct inet6_ifaddr *ifa;
4717
234b27c3 4718 /* unicast address incl. temp addr */
502a2ffd 4719 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4720 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4721 continue;
4722 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4723 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4724 cb->nlh->nlmsg_seq,
4725 RTM_NEWADDR,
4726 NLM_F_MULTI);
053c095a 4727 if (err < 0)
234b27c3 4728 break;
63998ac2 4729 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4730 }
4731 break;
502a2ffd 4732 }
234b27c3
ED		 4733 case MULTICAST_ADDR:
4734 /* multicast address */
4735 for (ifmca = idev->mc_list; ifmca;
4736 ifmca = ifmca->next, ip_idx++) {
4737 if (ip_idx < s_ip_idx)
4738 continue;
4739 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4740 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4741 cb->nlh->nlmsg_seq,
4742 RTM_GETMULTICAST,
4743 NLM_F_MULTI);
053c095a 4744 if (err < 0)
234b27c3
ED		 4745 break;
4746 }
4747 break;
4748 case ANYCAST_ADDR:
4749 /* anycast address */
4750 for (ifaca = idev->ac_list; ifaca;
4751 ifaca = ifaca->aca_next, ip_idx++) {
4752 if (ip_idx < s_ip_idx)
4753 continue;
4754 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4755 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4756 cb->nlh->nlmsg_seq,
4757 RTM_GETANYCAST,
4758 NLM_F_MULTI);
053c095a 4759 if (err < 0)
234b27c3
ED		 4760 break;
4761 }
4762 break;
4763 default:
4764 break;
4765 }
4766 read_unlock_bh(&idev->lock);
4767 *p_ip_idx = ip_idx;
4768 return err;
4769}
4770
1da177e4
LT		 4771static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4772 enum addr_type_t type)
4773{
234b27c3
ED		 4774 struct net *net = sock_net(skb->sk);
4775 int h, s_h;
1da177e4
LT		 4776 int idx, ip_idx;
4777 int s_idx, s_ip_idx;
1da177e4 4778 struct net_device *dev;
234b27c3
ED		 4779 struct inet6_dev *idev;
4780 struct hlist_head *head;
1ab1457c 4781
234b27c3
ED		 4782 s_h = cb->args[0];
4783 s_idx = idx = cb->args[1];
4784 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4785
234b27c3 4786 rcu_read_lock();
63998ac2 4787 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4788 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4789 idx = 0;
4790 head = &net->dev_index_head[h];
b67bfe0d 4791 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4792 if (idx < s_idx)
4793 goto cont;
4b97efdf 4794 if (h > s_h || idx > s_idx)
234b27c3
ED		 4795 s_ip_idx = 0;
4796 ip_idx = 0;
e21e8467
SH		 4797 idev = __in6_dev_get(dev);
4798 if (!idev)
234b27c3
ED		 4799 goto cont;
4800
4801 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4802 s_ip_idx, &ip_idx) < 0)
234b27c3 4803 goto done;
7562f876 4804cont:
234b27c3
ED		 4805 idx++;
4806 }
1da177e4 4807 }
234b27c3
ED		 4808done:
4809 rcu_read_unlock();
4810 cb->args[0] = h;
4811 cb->args[1] = idx;
4812 cb->args[2] = ip_idx;
4813
1da177e4
LT		 4814 return skb->len;
4815}
4816
4817static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4818{
4819 enum addr_type_t type = UNICAST_ADDR;
b854272b 4820
1da177e4
LT		 4821 return inet6_dump_addr(skb, cb, type);
4822}
4823
4824static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4825{
4826 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4827
1da177e4
LT		 4828 return inet6_dump_addr(skb, cb, type);
4829}
4830
4831
4832static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4833{
4834 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4835
1da177e4
LT		 4836 return inet6_dump_addr(skb, cb, type);
4837}
4838
661d2967 4839static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4840{
3b1e0a65 4841 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4842 struct ifaddrmsg *ifm;
4843 struct nlattr *tb[IFA_MAX+1];
caeaba79 4844 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4845 struct net_device *dev = NULL;
4846 struct inet6_ifaddr *ifa;
4847 struct sk_buff *skb;
6c223828
NT		 4848 int err;
4849
1b29fc2c
TG		 4850 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4851 if (err < 0)
4852 goto errout;
4853
caeaba79 4854 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
63159f29 4855 if (!addr) {
1b29fc2c
TG		 4856 err = -EINVAL;
4857 goto errout;
6c223828 4858 }
6c223828 4859
1b29fc2c 4860 ifm = nlmsg_data(nlh);
6c223828 4861 if (ifm->ifa_index)
6fda7350 4862 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4863
e21e8467
SH		 4864 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4865 if (!ifa) {
1b29fc2c
TG		 4866 err = -EADDRNOTAVAIL;
4867 goto errout;
4868 }
6c223828 4869
e21e8467
SH		 4870 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4871 if (!skb) {
6c223828 4872 err = -ENOBUFS;
1b29fc2c 4873 goto errout_ifa;
6c223828
NT		 4874 }
4875
15e47304 4876 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4877 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4878 if (err < 0) {
4879 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4880 WARN_ON(err == -EMSGSIZE);
4881 kfree_skb(skb);
4882 goto errout_ifa;
4883 }
15e47304 4884 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4885errout_ifa:
6c223828 4886 in6_ifa_put(ifa);
1b29fc2c 4887errout:
6c223828 4888 return err;
6c223828
NT		 4889}
4890
1da177e4
LT		 4891static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4892{
4893 struct sk_buff *skb;
c346dca1 4894 struct net *net = dev_net(ifa->idev->dev);
5d620266 4895 int err = -ENOBUFS;
1da177e4 4896
0ab6803b 4897 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 4898 if (!skb)
5d620266
TG		 4899 goto errout;
4900
4901 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4902 if (err < 0) {
4903 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4904 WARN_ON(err == -EMSGSIZE);
4905 kfree_skb(skb);
4906 goto errout;
4907 }
1ce85fe4
PNA		 4908 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4909 return;
5d620266
TG		 4910errout:
4911 if (err < 0)
6fda7350 4912 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4913}
4914
b6f99a21 4915static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4916 __s32 *array, int bytes)
4917{
04561c1f
TG		 4918 BUG_ON(bytes < (DEVCONF_MAX * 4));
4919
1da177e4
LT		 4920 memset(array, 0, bytes);
4921 array[DEVCONF_FORWARDING] = cnf->forwarding;
4922 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4923 array[DEVCONF_MTU6] = cnf->mtu6;
4924 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4925 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4926 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4927 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4928 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4929 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4930 jiffies_to_msecs(cnf->rtr_solicit_interval);
bd11f074
MŻ		 4931 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
4932 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
93908d19
TG		 4933 array[DEVCONF_RTR_SOLICIT_DELAY] =
4934 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4935 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4936 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4937 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4938 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4939 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4940 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4941 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4942 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4943 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4944 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4945 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4946 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 4947 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 4948 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4949#ifdef CONFIG_IPV6_ROUTER_PREF
4950 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4951 array[DEVCONF_RTR_PROBE_INTERVAL] =
4952 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4953#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4954 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4955#endif
930d6ff2 4956#endif
fbea49e1 4957 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4958 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4959#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4960 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 4961 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 4962#endif
7bc570c8
YH		 4963#ifdef CONFIG_IPV6_MROUTE
4964 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4965#endif
778d80be 4966 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4967 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4968 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4969 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 4970 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 4971 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 4972 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 4973 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 4974 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 4975 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 4976 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 4977 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 4978 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1ababeba 4979 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
bf355b8d
DL		 4980#ifdef CONFIG_IPV6_SEG6_HMAC
4981 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
4982#endif
adc176c5 4983 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
1da177e4
LT		 4984}
4985
b382b191
TG		 4986static inline size_t inet6_ifla6_size(void)
4987{
4988 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4989 + nla_total_size(sizeof(struct ifla_cacheinfo))
4990 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4991 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4992 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4993 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4994}
4995
339bf98f
TG		 4996static inline size_t inet6_if_nlmsg_size(void)
4997{
4998 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4999 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5000 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5001 + nla_total_size(4) /* IFLA_MTU */
5002 + nla_total_size(4) /* IFLA_LINK */
0344338b 5003 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 5004 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 5005}
c5396a31 5006
be281e55 5007static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
aca05671 5008 int bytes)
7f7d9a6b
HX		 5009{
5010 int i;
aca05671 5011 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
7f7d9a6b
HX		 5012 BUG_ON(pad < 0);
5013
5014 /* Use put_unaligned() because stats may not be aligned for u64. */
aca05671
JH		 5015 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5016 for (i = 1; i < ICMP6_MIB_MAX; i++)
be281e55 5017 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b 5018
aca05671 5019 memset(&stats[ICMP6_MIB_MAX], 0, pad);
7f7d9a6b
HX		 5020}
5021
698365fa 5022static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 5023 int bytes, size_t syncpoff)
4ce3c183 5024{
a3a77372
R		 5025 int i, c;
5026 u64 buff[IPSTATS_MIB_MAX];
5027 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5028
4ce3c183
ED		 5029 BUG_ON(pad < 0);
5030
a3a77372
R		 5031 memset(buff, 0, sizeof(buff));
5032 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 5033
a3a77372
R		 5034 for_each_possible_cpu(c) {
5035 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5036 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5037 }
5038
5039 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5040 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 5041}
5042
7f7d9a6b
HX		 5043static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5044 int bytes)
5045{
e21e8467 5046 switch (attrtype) {
7f7d9a6b 5047 case IFLA_INET6_STATS:
a3a77372
R		 5048 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5049 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 5050 break;
5051 case IFLA_INET6_ICMP6STATS:
aca05671 5052 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
7f7d9a6b
HX		 5053 break;
5054 }
5055}
5056
d5566fd7
SV		 5057static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5058 u32 ext_filter_mask)
b382b191
TG		 5059{
5060 struct nlattr *nla;
5061 struct ifla_cacheinfo ci;
5062
c78679e8
DM		 5063 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5064 goto nla_put_failure;
b382b191 5065 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 5066 ci.tstamp = cstamp_delta(idev->tstamp);
5067 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 5068 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 5069 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5070 goto nla_put_failure;
b382b191 5071 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 5072 if (!nla)
b382b191
TG		 5073 goto nla_put_failure;
5074 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5075
5076 /* XXX - MC not implemented */
5077
d5566fd7
SV		 5078 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5079 return 0;
5080
b382b191 5081 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 5082 if (!nla)
b382b191
TG		 5083 goto nla_put_failure;
5084 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5085
5086 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 5087 if (!nla)
b382b191
TG		 5088 goto nla_put_failure;
5089 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5090
f53adae4 5091 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 5092 if (!nla)
f53adae4 5093 goto nla_put_failure;
bc91b0f0
JP		 5094
5095 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
5096 goto nla_put_failure;
5097
f53adae4
DB		 5098 read_lock_bh(&idev->lock);
5099 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5100 read_unlock_bh(&idev->lock);
5101
b382b191
TG		 5102 return 0;
5103
5104nla_put_failure:
5105 return -EMSGSIZE;
5106}
5107
b1974ed0
AR		 5108static size_t inet6_get_link_af_size(const struct net_device *dev,
5109 u32 ext_filter_mask)
b382b191
TG		 5110{
5111 if (!__in6_dev_get(dev))
5112 return 0;
5113
5114 return inet6_ifla6_size();
5115}
5116
d5566fd7
SV		 5117static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5118 u32 ext_filter_mask)
b382b191
TG		 5119{
5120 struct inet6_dev *idev = __in6_dev_get(dev);
5121
5122 if (!idev)
5123 return -ENODATA;
5124
d5566fd7 5125 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5126 return -EMSGSIZE;
5127
5128 return 0;
5129}
5130
f53adae4
DB		 5131static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5132{
f53adae4
DB		 5133 struct inet6_ifaddr *ifp;
5134 struct net_device *dev = idev->dev;
47e27d5e 5135 bool clear_token, update_rs = false;
dc848292 5136 struct in6_addr ll_addr;
f53adae4 5137
c15b1cca
HFS		 5138 ASSERT_RTNL();
5139
63159f29 5140 if (!token)
f53adae4 5141 return -EINVAL;
f53adae4
DB		 5142 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5143 return -EINVAL;
f53adae4
DB		 5144 if (!ipv6_accept_ra(idev))
5145 return -EINVAL;
bd11f074 5146 if (idev->cnf.rtr_solicits == 0)
f53adae4
DB		 5147 return -EINVAL;
5148
5149 write_lock_bh(&idev->lock);
5150
5151 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5152 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5153
5154 write_unlock_bh(&idev->lock);
5155
47e27d5e
DB		 5156 clear_token = ipv6_addr_any(token);
5157 if (clear_token)
5158 goto update_lft;
5159
dc848292
HFS		 5160 if (!idev->dead && (idev->if_flags & IF_READY) &&
5161 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5162 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5163 /* If we're not ready, then normal ifup will take care
5164 * of this. Otherwise, we need to request our rs here.
5165 */
5166 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5167 update_rs = true;
5168 }
f53adae4 5169
47e27d5e 5170update_lft:
f53adae4 5171 write_lock_bh(&idev->lock);
fc403832 5172
77ecaace 5173 if (update_rs) {
fc403832 5174 idev->if_flags |= IF_RS_SENT;
bd11f074
MŻ		 5175 idev->rs_interval = rfc3315_s14_backoff_init(
5176 idev->cnf.rtr_solicit_interval);
77ecaace 5177 idev->rs_probes = 1;
bd11f074 5178 addrconf_mod_rs_timer(idev, idev->rs_interval);
77ecaace 5179 }
f53adae4
DB		 5180
5181 /* Well, that's kinda nasty ... */
5182 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5183 spin_lock(&ifp->lock);
617fe29d 5184 if (ifp->tokenized) {
f53adae4
DB		 5185 ifp->valid_lft = 0;
5186 ifp->prefered_lft = 0;
5187 }
5188 spin_unlock(&ifp->lock);
5189 }
5190
5191 write_unlock_bh(&idev->lock);
b2ed64a9 5192 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 5193 addrconf_verify_rtnl();
f53adae4
DB		 5194 return 0;
5195}
5196
11b1f828
DB		 5197static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5198 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5199 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5200};
5201
5202static int inet6_validate_link_af(const struct net_device *dev,
5203 const struct nlattr *nla)
5204{
5205 struct nlattr *tb[IFLA_INET6_MAX + 1];
5206
5207 if (dev && !__in6_dev_get(dev))
5208 return -EAFNOSUPPORT;
5209
5210 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5211}
5212
f53adae4
DB		 5213static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5214{
5215 int err = -EINVAL;
5216 struct inet6_dev *idev = __in6_dev_get(dev);
5217 struct nlattr *tb[IFLA_INET6_MAX + 1];
5218
5219 if (!idev)
5220 return -EAFNOSUPPORT;
5221
5222 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5223 BUG();
5224
bc91b0f0 5225 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 5226 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 5227 if (err)
5228 return err;
5229 }
5230
5231 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5232 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5233
5234 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
622c81d5 5235 mode != IN6_ADDR_GEN_MODE_NONE &&
cc9da6cc
BM		 5236 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5237 mode != IN6_ADDR_GEN_MODE_RANDOM)
622c81d5
HFS		 5238 return -EINVAL;
5239
5240 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5241 !idev->cnf.stable_secret.initialized &&
5242 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
bc91b0f0 5243 return -EINVAL;
622c81d5 5244
bc91b0f0
JP		 5245 idev->addr_gen_mode = mode;
5246 err = 0;
5247 }
f53adae4
DB		 5248
5249 return err;
5250}
5251
1ab1457c 5252static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5253 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5254{
04561c1f 5255 struct net_device *dev = idev->dev;
04561c1f
TG		 5256 struct ifinfomsg *hdr;
5257 struct nlmsghdr *nlh;
5258 void *protoinfo;
04561c1f 5259
15e47304 5260 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5261 if (!nlh)
26932566 5262 return -EMSGSIZE;
04561c1f
TG		 5263
5264 hdr = nlmsg_data(nlh);
5265 hdr->ifi_family = AF_INET6;
5266 hdr->__ifi_pad = 0;
5267 hdr->ifi_type = dev->type;
5268 hdr->ifi_index = dev->ifindex;
5269 hdr->ifi_flags = dev_get_flags(dev);
5270 hdr->ifi_change = 0;
5271
c78679e8
DM		 5272 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5273 (dev->addr_len &&
5274 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5275 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5276 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5277 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5278 nla_put_u8(skb, IFLA_OPERSTATE,
5279 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5280 goto nla_put_failure;
04561c1f 5281 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 5282 if (!protoinfo)
04561c1f 5283 goto nla_put_failure;
1da177e4 5284
d5566fd7 5285 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5286 goto nla_put_failure;
1da177e4 5287
04561c1f 5288 nla_nest_end(skb, protoinfo);
053c095a
JB		 5289 nlmsg_end(skb, nlh);
5290 return 0;
1da177e4 5291
04561c1f 5292nla_put_failure:
26932566
PM		 5293 nlmsg_cancel(skb, nlh);
5294 return -EMSGSIZE;
1da177e4
LT		 5295}
5296
5297static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5298{
3b1e0a65 5299 struct net *net = sock_net(skb->sk);
84d2697d 5300 int h, s_h;
434a8a58 5301 int idx = 0, s_idx;
1da177e4
LT		 5302 struct net_device *dev;
5303 struct inet6_dev *idev;
84d2697d 5304 struct hlist_head *head;
1da177e4 5305
84d2697d
ED		 5306 s_h = cb->args[0];
5307 s_idx = cb->args[1];
5308
5309 rcu_read_lock();
5310 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5311 idx = 0;
5312 head = &net->dev_index_head[h];
b67bfe0d 5313 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5314 if (idx < s_idx)
5315 goto cont;
5316 idev = __in6_dev_get(dev);
5317 if (!idev)
5318 goto cont;
5319 if (inet6_fill_ifinfo(skb, idev,
15e47304 5320 NETLINK_CB(cb->skb).portid,
84d2697d 5321 cb->nlh->nlmsg_seq,
053c095a 5322 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5323 goto out;
7562f876 5324cont:
84d2697d
ED		 5325 idx++;
5326 }
1da177e4 5327 }
84d2697d
ED		 5328out:
5329 rcu_read_unlock();
5330 cb->args[1] = idx;
5331 cb->args[0] = h;
1da177e4
LT		 5332
5333 return skb->len;
5334}
5335
5336void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5337{
5338 struct sk_buff *skb;
c346dca1 5339 struct net *net = dev_net(idev->dev);
8d7a76c9 5340 int err = -ENOBUFS;
1ab1457c 5341
339bf98f 5342 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5343 if (!skb)
8d7a76c9
TG		 5344 goto errout;
5345
5346 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5347 if (err < 0) {
5348 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5349 WARN_ON(err == -EMSGSIZE);
5350 kfree_skb(skb);
5351 goto errout;
5352 }
5f75a104 5353 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5354 return;
8d7a76c9
TG		 5355errout:
5356 if (err < 0)
5f75a104 5357 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5358}
5359
339bf98f
TG		 5360static inline size_t inet6_prefix_nlmsg_size(void)
5361{
5362 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5363 + nla_total_size(sizeof(struct in6_addr))
5364 + nla_total_size(sizeof(struct prefix_cacheinfo));
5365}
c5396a31 5366
1da177e4 5367static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5368 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5369 int event, unsigned int flags)
1da177e4 5370{
6051e2f4
TG		 5371 struct prefixmsg *pmsg;
5372 struct nlmsghdr *nlh;
1da177e4
LT		 5373 struct prefix_cacheinfo ci;
5374
15e47304 5375 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5376 if (!nlh)
26932566 5377 return -EMSGSIZE;
6051e2f4
TG		 5378
5379 pmsg = nlmsg_data(nlh);
1da177e4 5380 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5381 pmsg->prefix_pad1 = 0;
5382 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5383 pmsg->prefix_ifindex = idev->dev->ifindex;
5384 pmsg->prefix_len = pinfo->prefix_len;
5385 pmsg->prefix_type = pinfo->type;
8a47077a 5386 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5387 pmsg->prefix_flags = 0;
5388 if (pinfo->onlink)
5389 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5390 if (pinfo->autoconf)
5391 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5392
c78679e8
DM		 5393 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5394 goto nla_put_failure;
1da177e4
LT		 5395 ci.preferred_time = ntohl(pinfo->prefered);
5396 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5397 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5398 goto nla_put_failure;
053c095a
JB		 5399 nlmsg_end(skb, nlh);
5400 return 0;
1da177e4 5401
6051e2f4 5402nla_put_failure:
26932566
PM		 5403 nlmsg_cancel(skb, nlh);
5404 return -EMSGSIZE;
1da177e4
LT		 5405}
5406
1ab1457c 5407static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5408 struct prefix_info *pinfo)
5409{
5410 struct sk_buff *skb;
c346dca1 5411 struct net *net = dev_net(idev->dev);
8c384bfa 5412 int err = -ENOBUFS;
1da177e4 5413
339bf98f 5414 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5415 if (!skb)
8c384bfa
TG		 5416 goto errout;
5417
5418 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5419 if (err < 0) {
5420 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5421 WARN_ON(err == -EMSGSIZE);
5422 kfree_skb(skb);
5423 goto errout;
5424 }
1ce85fe4
PNA		 5425 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5426 return;
8c384bfa
TG		 5427errout:
5428 if (err < 0)
6fda7350 5429 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5430}
5431
1da177e4
LT		 5432static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5433{
63998ac2
ND		 5434 struct net *net = dev_net(ifp->idev->dev);
5435
c15b1cca
HFS		 5436 if (event)
5437 ASSERT_RTNL();
5438
1da177e4
LT		 5439 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5440
5441 switch (event) {
5442 case RTM_NEWADDR:
95c385b4
NH		 5443 /*
5444 * If the address was optimistic
5445 * we inserted the route at the start of
5446 * our DAD process, so we don't need
5447 * to do it again
5448 */
5449 if (!(ifp->rt->rt6i_node))
5450 ip6_ins_rt(ifp->rt);
1da177e4
LT		 5451 if (ifp->idev->cnf.forwarding)
5452 addrconf_join_anycast(ifp);
7996c799 5453 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 5454 addrconf_prefix_route(&ifp->peer_addr, 128,
5455 ifp->idev->dev, 0, 0);
1da177e4
LT		 5456 break;
5457 case RTM_DELADDR:
5458 if (ifp->idev->cnf.forwarding)
5459 addrconf_leave_anycast(ifp);
5460 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5461 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 5462 struct rt6_info *rt;
caeaba79 5463
e7478dfc
ND		 5464 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5465 ifp->idev->dev, 0, 0);
8e3d5be7
MKL		 5466 if (rt)
5467 ip6_del_rt(rt);
caeaba79 5468 }
38bd10c4
DA		 5469 if (ifp->rt) {
5470 dst_hold(&ifp->rt->dst);
5471 ip6_del_rt(ifp->rt);
5472 }
705f1c86 5473 rt_genid_bump_ipv6(net);
1da177e4
LT		 5474 break;
5475 }
63998ac2 5476 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5477}
5478
5479static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5480{
8814c4b5 5481 rcu_read_lock_bh();
1da177e4
LT		 5482 if (likely(ifp->idev->dead == 0))
5483 __ipv6_ifa_notify(event, ifp);
8814c4b5 5484 rcu_read_unlock_bh();
1da177e4
LT		 5485}
5486
5487#ifdef CONFIG_SYSCTL
5488
5489static
fe2c6338 5490int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5491 void __user *buffer, size_t *lenp, loff_t *ppos)
5492{
5493 int *valp = ctl->data;
5494 int val = *valp;
88af182e 5495 loff_t pos = *ppos;
fe2c6338 5496 struct ctl_table lctl;
1da177e4
LT		 5497 int ret;
5498
013d97e9
FR		 5499 /*
5500 * ctl->data points to idev->cnf.forwarding, we should
5501 * not modify it until we get the rtnl lock.
5502 */
5503 lctl = *ctl;
5504 lctl.data = &val;
5505
5506 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5507
c8fecf22 5508 if (write)
b325fddb 5509 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5510 if (ret)
5511 *ppos = pos;
1ab1457c 5512 return ret;
1da177e4
LT		 5513}
5514
77751427
ML		 5515static
5516int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5517 void __user *buffer, size_t *lenp, loff_t *ppos)
5518{
5519 struct inet6_dev *idev = ctl->extra1;
5520 int min_mtu = IPV6_MIN_MTU;
5521 struct ctl_table lctl;
5522
5523 lctl = *ctl;
5524 lctl.extra1 = &min_mtu;
5525 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5526
5527 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5528}
5529
56d417b1
BH		 5530static void dev_disable_change(struct inet6_dev *idev)
5531{
75538c2b
CW		 5532 struct netdev_notifier_info info;
5533
56d417b1
BH		 5534 if (!idev || !idev->dev)
5535 return;
5536
75538c2b 5537 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5538 if (idev->cnf.disable_ipv6)
75538c2b 5539 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5540 else
75538c2b 5541 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5542}
5543
5544static void addrconf_disable_change(struct net *net, __s32 newf)
5545{
5546 struct net_device *dev;
5547 struct inet6_dev *idev;
5548
03e4deff 5549 for_each_netdev(net, dev) {
56d417b1
BH		 5550 idev = __in6_dev_get(dev);
5551 if (idev) {
5552 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5553 idev->cnf.disable_ipv6 = newf;
5554 if (changed)
5555 dev_disable_change(idev);
5556 }
56d417b1 5557 }
56d417b1
BH		 5558}
5559
013d97e9 5560static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5561{
5562 struct net *net;
013d97e9
FR		 5563 int old;
5564
5565 if (!rtnl_trylock())
5566 return restart_syscall();
56d417b1
BH		 5567
5568 net = (struct net *)table->extra2;
013d97e9
FR		 5569 old = *p;
5570 *p = newf;
56d417b1 5571
013d97e9
FR		 5572 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5573 rtnl_unlock();
56d417b1 5574 return 0;
88af182e 5575 }
56d417b1
BH		 5576
5577 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5578 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5579 addrconf_disable_change(net, newf);
013d97e9 5580 } else if ((!newf) ^ (!old))
56d417b1
BH		 5581 dev_disable_change((struct inet6_dev *)table->extra1);
5582
5583 rtnl_unlock();
5584 return 0;
5585}
5586
5587static
fe2c6338 5588int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5589 void __user *buffer, size_t *lenp, loff_t *ppos)
5590{
5591 int *valp = ctl->data;
5592 int val = *valp;
88af182e 5593 loff_t pos = *ppos;
fe2c6338 5594 struct ctl_table lctl;
56d417b1
BH		 5595 int ret;
5596
013d97e9
FR		 5597 /*
5598 * ctl->data points to idev->cnf.disable_ipv6, we should
5599 * not modify it until we get the rtnl lock.
5600 */
5601 lctl = *ctl;
5602 lctl.data = &val;
5603
5604 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5605
5606 if (write)
5607 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5608 if (ret)
5609 *ppos = pos;
56d417b1
BH		 5610 return ret;
5611}
5612
c92d5491 5613static
5614int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5615 void __user *buffer, size_t *lenp, loff_t *ppos)
5616{
5617 int *valp = ctl->data;
5618 int ret;
5619 int old, new;
5620
5621 old = *valp;
5622 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5623 new = *valp;
5624
5625 if (write && old != new) {
5626 struct net *net = ctl->extra2;
5627
5628 if (!rtnl_trylock())
5629 return restart_syscall();
5630
5631 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5632 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5633 NETCONFA_IFINDEX_DEFAULT,
5634 net->ipv6.devconf_dflt);
5635 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5636 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5637 NETCONFA_IFINDEX_ALL,
5638 net->ipv6.devconf_all);
5639 else {
5640 struct inet6_dev *idev = ctl->extra1;
5641
5642 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5643 idev->dev->ifindex,
5644 &idev->cnf);
5645 }
5646 rtnl_unlock();
5647 }
5648
5649 return ret;
5650}
5651
3d1bec99
HFS		 5652static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5653 void __user *buffer, size_t *lenp,
5654 loff_t *ppos)
5655{
5656 int err;
5657 struct in6_addr addr;
5658 char str[IPV6_MAX_STRLEN];
5659 struct ctl_table lctl = *ctl;
622c81d5 5660 struct net *net = ctl->extra2;
3d1bec99
HFS		 5661 struct ipv6_stable_secret *secret = ctl->data;
5662
622c81d5
HFS		 5663 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5664 return -EIO;
5665
3d1bec99
HFS		 5666 lctl.maxlen = IPV6_MAX_STRLEN;
5667 lctl.data = str;
5668
5669 if (!rtnl_trylock())
5670 return restart_syscall();
5671
5672 if (!write && !secret->initialized) {
5673 err = -EIO;
5674 goto out;
5675 }
5676
5449a5ca
WC		 5677 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5678 if (err >= sizeof(str)) {
5679 err = -EIO;
5680 goto out;
3d1bec99
HFS		 5681 }
5682
5683 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5684 if (err || !write)
5685 goto out;
5686
5687 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5688 err = -EIO;
5689 goto out;
5690 }
5691
5692 secret->initialized = true;
5693 secret->secret = addr;
5694
622c81d5
HFS		 5695 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5696 struct net_device *dev;
5697
5698 for_each_netdev(net, dev) {
5699 struct inet6_dev *idev = __in6_dev_get(dev);
5700
5701 if (idev) {
5702 idev->addr_gen_mode =
5703 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5704 }
5705 }
5706 } else {
5707 struct inet6_dev *idev = ctl->extra1;
5708
5709 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5710 }
5711
3d1bec99
HFS		 5712out:
5713 rtnl_unlock();
5714
5715 return err;
5716}
c92d5491 5717
35103d11
AG		 5718static
5719int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5720 int write,
5721 void __user *buffer,
5722 size_t *lenp,
5723 loff_t *ppos)
5724{
5725 int *valp = ctl->data;
5726 int val = *valp;
5727 loff_t pos = *ppos;
5728 struct ctl_table lctl;
5729 int ret;
5730
5731 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5732 * we should not modify it until we get the rtnl lock.
5733 */
5734 lctl = *ctl;
5735 lctl.data = &val;
5736
5737 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5738
5739 if (write)
5740 ret = addrconf_fixup_linkdown(ctl, valp, val);
5741 if (ret)
5742 *ppos = pos;
5743 return ret;
5744}
5745
cb4a4c69 5746static int minus_one = -1;
cb9e684e
MŻ		 5747static const int one = 1;
5748static const int two_five_five = 255;
5749
607ea7cd 5750static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 5751 {
5752 .procname = "forwarding",
5753 .data = &ipv6_devconf.forwarding,
5754 .maxlen = sizeof(int),
5755 .mode = 0644,
5756 .proc_handler = addrconf_sysctl_forward,
5757 },
5758 {
5759 .procname = "hop_limit",
5760 .data = &ipv6_devconf.hop_limit,
5761 .maxlen = sizeof(int),
5762 .mode = 0644,
cb9e684e
MŻ		 5763 .proc_handler = proc_dointvec_minmax,
5764 .extra1 = (void *)&one,
5765 .extra2 = (void *)&two_five_five,
5df1f77f
KK		 5766 },
5767 {
5768 .procname = "mtu",
5769 .data = &ipv6_devconf.mtu6,
5770 .maxlen = sizeof(int),
5771 .mode = 0644,
5772 .proc_handler = addrconf_sysctl_mtu,
5773 },
5774 {
5775 .procname = "accept_ra",
5776 .data = &ipv6_devconf.accept_ra,
5777 .maxlen = sizeof(int),
5778 .mode = 0644,
5779 .proc_handler = proc_dointvec,
5780 },
5781 {
5782 .procname = "accept_redirects",
5783 .data = &ipv6_devconf.accept_redirects,
5784 .maxlen = sizeof(int),
5785 .mode = 0644,
5786 .proc_handler = proc_dointvec,
5787 },
5788 {
5789 .procname = "autoconf",
5790 .data = &ipv6_devconf.autoconf,
5791 .maxlen = sizeof(int),
5792 .mode = 0644,
5793 .proc_handler = proc_dointvec,
5794 },
5795 {
5796 .procname = "dad_transmits",
5797 .data = &ipv6_devconf.dad_transmits,
5798 .maxlen = sizeof(int),
5799 .mode = 0644,
5800 .proc_handler = proc_dointvec,
5801 },
5802 {
5803 .procname = "router_solicitations",
5804 .data = &ipv6_devconf.rtr_solicits,
5805 .maxlen = sizeof(int),
5806 .mode = 0644,
cb4a4c69
MŻ		 5807 .proc_handler = proc_dointvec_minmax,
5808 .extra1 = &minus_one,
5df1f77f
KK		 5809 },
5810 {
5811 .procname = "router_solicitation_interval",
5812 .data = &ipv6_devconf.rtr_solicit_interval,
5813 .maxlen = sizeof(int),
5814 .mode = 0644,
5815 .proc_handler = proc_dointvec_jiffies,
5816 },
bd11f074
MŻ		 5817 {
5818 .procname = "router_solicitation_max_interval",
5819 .data = &ipv6_devconf.rtr_solicit_max_interval,
5820 .maxlen = sizeof(int),
5821 .mode = 0644,
5822 .proc_handler = proc_dointvec_jiffies,
5823 },
5df1f77f
KK		 5824 {
5825 .procname = "router_solicitation_delay",
5826 .data = &ipv6_devconf.rtr_solicit_delay,
5827 .maxlen = sizeof(int),
5828 .mode = 0644,
5829 .proc_handler = proc_dointvec_jiffies,
5830 },
5831 {
5832 .procname = "force_mld_version",
5833 .data = &ipv6_devconf.force_mld_version,
5834 .maxlen = sizeof(int),
5835 .mode = 0644,
5836 .proc_handler = proc_dointvec,
5837 },
5838 {
5839 .procname = "mldv1_unsolicited_report_interval",
5840 .data =
5841 &ipv6_devconf.mldv1_unsolicited_report_interval,
5842 .maxlen = sizeof(int),
5843 .mode = 0644,
5844 .proc_handler = proc_dointvec_ms_jiffies,
5845 },
5846 {
5847 .procname = "mldv2_unsolicited_report_interval",
5848 .data =
5849 &ipv6_devconf.mldv2_unsolicited_report_interval,
5850 .maxlen = sizeof(int),
5851 .mode = 0644,
5852 .proc_handler = proc_dointvec_ms_jiffies,
5853 },
5854 {
5855 .procname = "use_tempaddr",
5856 .data = &ipv6_devconf.use_tempaddr,
5857 .maxlen = sizeof(int),
5858 .mode = 0644,
5859 .proc_handler = proc_dointvec,
5860 },
5861 {
5862 .procname = "temp_valid_lft",
5863 .data = &ipv6_devconf.temp_valid_lft,
5864 .maxlen = sizeof(int),
5865 .mode = 0644,
5866 .proc_handler = proc_dointvec,
5867 },
5868 {
5869 .procname = "temp_prefered_lft",
5870 .data = &ipv6_devconf.temp_prefered_lft,
5871 .maxlen = sizeof(int),
5872 .mode = 0644,
5873 .proc_handler = proc_dointvec,
5874 },
5875 {
5876 .procname = "regen_max_retry",
5877 .data = &ipv6_devconf.regen_max_retry,
5878 .maxlen = sizeof(int),
5879 .mode = 0644,
5880 .proc_handler = proc_dointvec,
5881 },
5882 {
5883 .procname = "max_desync_factor",
5884 .data = &ipv6_devconf.max_desync_factor,
5885 .maxlen = sizeof(int),
5886 .mode = 0644,
5887 .proc_handler = proc_dointvec,
5888 },
5889 {
5890 .procname = "max_addresses",
5891 .data = &ipv6_devconf.max_addresses,
5892 .maxlen = sizeof(int),
5893 .mode = 0644,
5894 .proc_handler = proc_dointvec,
5895 },
5896 {
5897 .procname = "accept_ra_defrtr",
5898 .data = &ipv6_devconf.accept_ra_defrtr,
5899 .maxlen = sizeof(int),
5900 .mode = 0644,
5901 .proc_handler = proc_dointvec,
5902 },
5903 {
5904 .procname = "accept_ra_min_hop_limit",
5905 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5906 .maxlen = sizeof(int),
5907 .mode = 0644,
5908 .proc_handler = proc_dointvec,
5909 },
5910 {
5911 .procname = "accept_ra_pinfo",
5912 .data = &ipv6_devconf.accept_ra_pinfo,
5913 .maxlen = sizeof(int),
5914 .mode = 0644,
5915 .proc_handler = proc_dointvec,
5916 },
930d6ff2 5917#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 5918 {
5919 .procname = "accept_ra_rtr_pref",
5920 .data = &ipv6_devconf.accept_ra_rtr_pref,
5921 .maxlen = sizeof(int),
5922 .mode = 0644,
5923 .proc_handler = proc_dointvec,
5924 },
5925 {
5926 .procname = "router_probe_interval",
5927 .data = &ipv6_devconf.rtr_probe_interval,
5928 .maxlen = sizeof(int),
5929 .mode = 0644,
5930 .proc_handler = proc_dointvec_jiffies,
5931 },
fa03ef38 5932#ifdef CONFIG_IPV6_ROUTE_INFO
5df1f77f
KK		 5933 {
5934 .procname = "accept_ra_rt_info_max_plen",
5935 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5936 .maxlen = sizeof(int),
5937 .mode = 0644,
5938 .proc_handler = proc_dointvec,
5939 },
09c884d4 5940#endif
930d6ff2 5941#endif
5df1f77f
KK		 5942 {
5943 .procname = "proxy_ndp",
5944 .data = &ipv6_devconf.proxy_ndp,
5945 .maxlen = sizeof(int),
5946 .mode = 0644,
5947 .proc_handler = addrconf_sysctl_proxy_ndp,
5948 },
5949 {
5950 .procname = "accept_source_route",
5951 .data = &ipv6_devconf.accept_source_route,
5952 .maxlen = sizeof(int),
5953 .mode = 0644,
5954 .proc_handler = proc_dointvec,
5955 },
95c385b4 5956#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 5957 {
5958 .procname = "optimistic_dad",
5959 .data = &ipv6_devconf.optimistic_dad,
5960 .maxlen = sizeof(int),
5961 .mode = 0644,
5962 .proc_handler = proc_dointvec,
5963 },
5964 {
5965 .procname = "use_optimistic",
5966 .data = &ipv6_devconf.use_optimistic,
5967 .maxlen = sizeof(int),
5968 .mode = 0644,
5969 .proc_handler = proc_dointvec,
5970 },
7bc570c8
YH		 5971#endif
5972#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 5973 {
5974 .procname = "mc_forwarding",
5975 .data = &ipv6_devconf.mc_forwarding,
5976 .maxlen = sizeof(int),
5977 .mode = 0444,
5978 .proc_handler = proc_dointvec,
5979 },
95c385b4 5980#endif
5df1f77f
KK		 5981 {
5982 .procname = "disable_ipv6",
5983 .data = &ipv6_devconf.disable_ipv6,
5984 .maxlen = sizeof(int),
5985 .mode = 0644,
5986 .proc_handler = addrconf_sysctl_disable,
5987 },
5988 {
5989 .procname = "accept_dad",
5990 .data = &ipv6_devconf.accept_dad,
5991 .maxlen = sizeof(int),
5992 .mode = 0644,
5993 .proc_handler = proc_dointvec,
5994 },
5995 {
5996 .procname = "force_tllao",
5997 .data = &ipv6_devconf.force_tllao,
5998 .maxlen = sizeof(int),
5999 .mode = 0644,
6000 .proc_handler = proc_dointvec
6001 },
6002 {
6003 .procname = "ndisc_notify",
6004 .data = &ipv6_devconf.ndisc_notify,
6005 .maxlen = sizeof(int),
6006 .mode = 0644,
6007 .proc_handler = proc_dointvec
6008 },
6009 {
6010 .procname = "suppress_frag_ndisc",
6011 .data = &ipv6_devconf.suppress_frag_ndisc,
6012 .maxlen = sizeof(int),
6013 .mode = 0644,
6014 .proc_handler = proc_dointvec
6015 },
6016 {
6017 .procname = "accept_ra_from_local",
6018 .data = &ipv6_devconf.accept_ra_from_local,
6019 .maxlen = sizeof(int),
6020 .mode = 0644,
6021 .proc_handler = proc_dointvec,
6022 },
6023 {
6024 .procname = "accept_ra_mtu",
6025 .data = &ipv6_devconf.accept_ra_mtu,
6026 .maxlen = sizeof(int),
6027 .mode = 0644,
6028 .proc_handler = proc_dointvec,
6029 },
6030 {
6031 .procname = "stable_secret",
6032 .data = &ipv6_devconf.stable_secret,
6033 .maxlen = IPV6_MAX_STRLEN,
6034 .mode = 0600,
6035 .proc_handler = addrconf_sysctl_stable_secret,
6036 },
6037 {
6038 .procname = "use_oif_addrs_only",
6039 .data = &ipv6_devconf.use_oif_addrs_only,
6040 .maxlen = sizeof(int),
6041 .mode = 0644,
6042 .proc_handler = proc_dointvec,
6043 },
6044 {
6045 .procname = "ignore_routes_with_linkdown",
6046 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6047 .maxlen = sizeof(int),
6048 .mode = 0644,
6049 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6050 },
6051 {
6052 .procname = "drop_unicast_in_l2_multicast",
6053 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6054 .maxlen = sizeof(int),
6055 .mode = 0644,
6056 .proc_handler = proc_dointvec,
6057 },
6058 {
6059 .procname = "drop_unsolicited_na",
6060 .data = &ipv6_devconf.drop_unsolicited_na,
6061 .maxlen = sizeof(int),
6062 .mode = 0644,
6063 .proc_handler = proc_dointvec,
6064 },
6065 {
6066 .procname = "keep_addr_on_down",
6067 .data = &ipv6_devconf.keep_addr_on_down,
6068 .maxlen = sizeof(int),
6069 .mode = 0644,
6070 .proc_handler = proc_dointvec,
6071
6072 },
1ababeba
DL		 6073 {
6074 .procname = "seg6_enabled",
6075 .data = &ipv6_devconf.seg6_enabled,
6076 .maxlen = sizeof(int),
6077 .mode = 0644,
6078 .proc_handler = proc_dointvec,
6079 },
bf355b8d
DL		 6080#ifdef CONFIG_IPV6_SEG6_HMAC
6081 {
6082 .procname = "seg6_require_hmac",
6083 .data = &ipv6_devconf.seg6_require_hmac,
6084 .maxlen = sizeof(int),
6085 .mode = 0644,
6086 .proc_handler = proc_dointvec,
6087 },
6088#endif
adc176c5
EN		 6089 {
6090 .procname = "enhanced_dad",
6091 .data = &ipv6_devconf.enhanced_dad,
6092 .maxlen = sizeof(int),
6093 .mode = 0644,
6094 .proc_handler = proc_dointvec,
6095 },
5df1f77f
KK		 6096 {
6097 /* sentinel */
6098 }
1da177e4
LT		 6099};
6100
bff16c2f 6101static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 6102 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4 6103{
29c994e3 6104 int i, ifindex;
607ea7cd 6105 struct ctl_table *table;
6105e293 6106 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 6107
607ea7cd
KK		 6108 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6109 if (!table)
f68635e6
PE		 6110 goto out;
6111
607ea7cd
KK		 6112 for (i = 0; table[i].data; i++) {
6113 table[i].data += (char *)p - (char *)&ipv6_devconf;
cb9e684e
MŻ		 6114 /* If one of these is already set, then it is not safe to
6115 * overwrite either of them: this makes proc_dointvec_minmax
6116 * usable.
6117 */
6118 if (!table[i].extra1 && !table[i].extra2) {
6119 table[i].extra1 = idev; /* embedded; no ref */
6120 table[i].extra2 = net;
6121 }
1da177e4 6122 }
1da177e4 6123
6105e293 6124 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 6125
607ea7cd
KK		 6126 p->sysctl_header = register_net_sysctl(net, path, table);
6127 if (!p->sysctl_header)
6105e293 6128 goto free;
f68635e6 6129
29c994e3
ND		 6130 if (!strcmp(dev_name, "all"))
6131 ifindex = NETCONFA_IFINDEX_ALL;
6132 else if (!strcmp(dev_name, "default"))
6133 ifindex = NETCONFA_IFINDEX_DEFAULT;
6134 else
6135 ifindex = idev->dev->ifindex;
6136 inet6_netconf_notify_devconf(net, NETCONFA_ALL, ifindex, p);
95897312 6137 return 0;
1da177e4 6138
f68635e6 6139free:
607ea7cd 6140 kfree(table);
f68635e6 6141out:
95897312 6142 return -ENOBUFS;
1da177e4
LT		 6143}
6144
408c4768
PE		 6145static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
6146{
607ea7cd 6147 struct ctl_table *table;
408c4768 6148
607ea7cd 6149 if (!p->sysctl_header)
408c4768
PE		 6150 return;
6151
607ea7cd
KK		 6152 table = p->sysctl_header->ctl_table_arg;
6153 unregister_net_sysctl_table(p->sysctl_header);
6154 p->sysctl_header = NULL;
6155 kfree(table);
408c4768
PE		 6156}
6157
a317a2f1 6158static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 6159{
a317a2f1
WC		 6160 int err;
6161
6162 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6163 return -EINVAL;
6164
6165 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6166 &ndisc_ifinfo_sysctl_change);
6167 if (err)
6168 return err;
6169 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6170 idev, &idev->cnf);
6171 if (err)
6172 neigh_sysctl_unregister(idev->nd_parms);
6173
6174 return err;
f52295a9
PE		 6175}
6176
408c4768 6177static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 6178{
408c4768
PE		 6179 __addrconf_sysctl_unregister(&idev->cnf);
6180 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 6181}
6182
6183
6184#endif
6185
2c8c1e72 6186static int __net_init addrconf_init_net(struct net *net)
e0da5a48 6187{
a79ca223 6188 int err = -ENOMEM;
e0da5a48
PE		 6189 struct ipv6_devconf *all, *dflt;
6190
a79ca223 6191 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 6192 if (!all)
a79ca223 6193 goto err_alloc_all;
e0da5a48 6194
a79ca223 6195 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 6196 if (!dflt)
a79ca223 6197 goto err_alloc_dflt;
e0da5a48 6198
a79ca223
HZ		 6199 /* these will be inherited by all namespaces */
6200 dflt->autoconf = ipv6_defaults.autoconf;
6201 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 6202
3d1bec99
HFS		 6203 dflt->stable_secret.initialized = false;
6204 all->stable_secret.initialized = false;
6205
e0da5a48
PE		 6206 net->ipv6.devconf_all = all;
6207 net->ipv6.devconf_dflt = dflt;
6208
6209#ifdef CONFIG_SYSCTL
f8572d8f 6210 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 6211 if (err < 0)
6212 goto err_reg_all;
6213
f8572d8f 6214 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 6215 if (err < 0)
6216 goto err_reg_dflt;
6217#endif
6218 return 0;
6219
6220#ifdef CONFIG_SYSCTL
6221err_reg_dflt:
6222 __addrconf_sysctl_unregister(all);
6223err_reg_all:
6224 kfree(dflt);
6225#endif
6226err_alloc_dflt:
6227 kfree(all);
6228err_alloc_all:
6229 return err;
6230}
6231
2c8c1e72 6232static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 6233{
6234#ifdef CONFIG_SYSCTL
6235 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
6236 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
6237#endif
73cf0e92 6238 kfree(net->ipv6.devconf_dflt);
6239 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 6240}
6241
6242static struct pernet_operations addrconf_ops = {
6243 .init = addrconf_init_net,
6244 .exit = addrconf_exit_net,
6245};
6246
207895fd 6247static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 6248 .family = AF_INET6,
6249 .fill_link_af = inet6_fill_link_af,
6250 .get_link_af_size = inet6_get_link_af_size,
11b1f828 6251 .validate_link_af = inet6_validate_link_af,
f53adae4 6252 .set_link_af = inet6_set_link_af,
b382b191
TG		 6253};
6254
1da177e4
LT		 6255/*
6256 * Init / cleanup code
6257 */
6258
6259int __init addrconf_init(void)
6260{
a317a2f1 6261 struct inet6_dev *idev;
c2e21293 6262 int i, err;
2a8cc6c8 6263
e21e8467
SH		 6264 err = ipv6_addr_label_init();
6265 if (err < 0) {
f3213831
JP		 6266 pr_crit("%s: cannot initialize default policy table: %d\n",
6267 __func__, err);
2cc6d2bf 6268 goto out;
2a8cc6c8 6269 }
1da177e4 6270
2cc6d2bf
NH		 6271 err = register_pernet_subsys(&addrconf_ops);
6272 if (err < 0)
6273 goto out_addrlabel;
e0da5a48 6274
c15b1cca
HFS		 6275 addrconf_wq = create_workqueue("ipv6_addrconf");
6276 if (!addrconf_wq) {
6277 err = -ENOMEM;
6278 goto out_nowq;
6279 }
6280
1da177e4
LT		 6281 /* The addrconf netdev notifier requires that loopback_dev
6282 * has it's ipv6 private information allocated and setup
6283 * before it can bring up and give link-local addresses
6284 * to other devices which are up.
6285 *
6286 * Unfortunately, loopback_dev is not necessarily the first
6287 * entry in the global dev_base list of net devices. In fact,
6288 * it is likely to be the very last entry on that list.
6289 * So this causes the notifier registry below to try and
6290 * give link-local addresses to all devices besides loopback_dev
6291 * first, then loopback_dev, which cases all the non-loopback_dev
6292 * devices to fail to get a link-local address.
6293 *
6294 * So, as a temporary fix, allocate the ipv6 structure for
6295 * loopback_dev first by hand.
6296 * Longer term, all of the dependencies ipv6 has upon the loopback
6297 * device and it being up should be removed.
6298 */
6299 rtnl_lock();
a317a2f1 6300 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 6301 rtnl_unlock();
a317a2f1
WC		 6302 if (IS_ERR(idev)) {
6303 err = PTR_ERR(idev);
e0da5a48 6304 goto errlo;
a317a2f1 6305 }
1da177e4 6306
c2e21293 6307 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6308 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6309
1da177e4
LT		 6310 register_netdevice_notifier(&ipv6_dev_notf);
6311
c15b1cca 6312 addrconf_verify();
c127ea2c 6313
3678a9d8 6314 rtnl_af_register(&inet6_ops);
b382b191 6315
c7ac8679
GR		 6316 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6317 NULL);
c127ea2c
TG		 6318 if (err < 0)
6319 goto errout;
6320
6321 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 6322 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6323 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6324 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6325 inet6_dump_ifaddr, NULL);
6326 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6327 inet6_dump_ifmcaddr, NULL);
6328 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6329 inet6_dump_ifacaddr, NULL);
76f8f6cb 6330 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 6331 inet6_netconf_dump_devconf, NULL);
c127ea2c 6332
2a8cc6c8
YH		 6333 ipv6_addr_label_rtnl_register();
6334
1da177e4 6335 return 0;
c127ea2c 6336errout:
b382b191 6337 rtnl_af_unregister(&inet6_ops);
c127ea2c 6338 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6339errlo:
c15b1cca
HFS		 6340 destroy_workqueue(addrconf_wq);
6341out_nowq:
e0da5a48 6342 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 6343out_addrlabel:
6344 ipv6_addr_label_cleanup();
6345out:
c127ea2c 6346 return err;
1da177e4
LT		 6347}
6348
09f7709f 6349void addrconf_cleanup(void)
1da177e4 6350{
176c39af 6351 struct net_device *dev;
1da177e4
LT		 6352 int i;
6353
6354 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6355 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 6356 ipv6_addr_label_cleanup();
1da177e4
LT		 6357
6358 rtnl_lock();
6359
b382b191
TG		 6360 __rtnl_af_unregister(&inet6_ops);
6361
176c39af
DL		 6362 /* clean dev list */
6363 for_each_netdev(&init_net, dev) {
6364 if (__in6_dev_get(dev) == NULL)
6365 continue;
6366 addrconf_ifdown(dev, 1);
6367 }
6368 addrconf_ifdown(init_net.loopback_dev, 2);
6369
1da177e4
LT		 6370 /*
6371 * Check hash table.
6372 */
5c578aed 6373 spin_lock_bh(&addrconf_hash_lock);
c2e21293 6374 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6375 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 6376 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 6377 cancel_delayed_work(&addr_chk_work);
1da177e4 6378 rtnl_unlock();
c15b1cca
HFS		 6379
6380 destroy_workqueue(addrconf_wq);
1da177e4 6381}
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