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nvme.h: add an enum for cns values
[linux-2.6-block.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
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
eb7e0575
SD		 150static void __ipv6_regen_rndid(struct inet6_dev *idev);
151static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 152static void ipv6_regen_rndid(unsigned long data);
1da177e4 153
1b34be74 154static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4 155static int ipv6_count_addresses(struct inet6_dev *idev);
622c81d5
HFS		 156static int ipv6_generate_stable_address(struct in6_addr *addr,
157 u8 dad_count,
158 const struct inet6_dev *idev);
1da177e4
LT		 159
160/*
161 * Configured unicast address hash table
162 */
c2e21293 163static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 164static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 165
c15b1cca
HFS		 166static void addrconf_verify(void);
167static void addrconf_verify_rtnl(void);
168static void addrconf_verify_work(struct work_struct *);
1da177e4 169
c15b1cca
HFS		 170static struct workqueue_struct *addrconf_wq;
171static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 172
173static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
174static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
175
93d9b7d7
JP		 176static void addrconf_type_change(struct net_device *dev,
177 unsigned long event);
1da177e4
LT		 178static int addrconf_ifdown(struct net_device *dev, int how);
179
21caa662
RK		 180static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
181 int plen,
182 const struct net_device *dev,
183 u32 flags, u32 noflags);
184
cf22f9a2 185static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 186static void addrconf_dad_work(struct work_struct *w);
1da177e4 187static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 188static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 189static void addrconf_rs_timer(unsigned long data);
190static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
191static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
192
1ab1457c 193static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 194 struct prefix_info *pinfo);
3e81c6da
DM		 195static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
196 struct net_device *dev);
1da177e4 197
888c848e 198static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 199 .forwarding = 0,
200 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
201 .mtu6 = IPV6_MIN_MTU,
202 .accept_ra = 1,
203 .accept_redirects = 1,
204 .autoconf = 1,
205 .force_mld_version = 0,
fc4eba58
HFS		 206 .mldv1_unsolicited_report_interval = 10 * HZ,
207 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 208 .dad_transmits = 1,
209 .rtr_solicits = MAX_RTR_SOLICITATIONS,
210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 211 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 212 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 213 .use_tempaddr = 0,
1da177e4
LT		 214 .temp_valid_lft = TEMP_VALID_LIFETIME,
215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
216 .regen_max_retry = REGEN_MAX_RETRY,
217 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 218 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 219 .accept_ra_defrtr = 1,
d9333196 220 .accept_ra_from_local = 0,
8013d1d7 221 .accept_ra_min_hop_limit= 1,
c4fd30eb 222 .accept_ra_pinfo = 1,
930d6ff2
YH		 223#ifdef CONFIG_IPV6_ROUTER_PREF
224 .accept_ra_rtr_pref = 1,
52e16356 225 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 226#ifdef CONFIG_IPV6_ROUTE_INFO
227 .accept_ra_rt_info_max_plen = 0,
228#endif
930d6ff2 229#endif
fbea49e1 230 .proxy_ndp = 0,
0bcbc926 231 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 232 .disable_ipv6 = 0,
1b34be74 233 .accept_dad = 1,
b800c3b9 234 .suppress_frag_ndisc = 1,
c2943f14 235 .accept_ra_mtu = 1,
3d1bec99
HFS		 236 .stable_secret = {
237 .initialized = false,
3985e8a3
EK		 238 },
239 .use_oif_addrs_only = 0,
35103d11 240 .ignore_routes_with_linkdown = 0,
f1705ec1 241 .keep_addr_on_down = 0,
1da177e4
LT		 242};
243
ab32ea5d 244static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 245 .forwarding = 0,
246 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
247 .mtu6 = IPV6_MIN_MTU,
248 .accept_ra = 1,
249 .accept_redirects = 1,
250 .autoconf = 1,
fc4eba58
HFS		 251 .force_mld_version = 0,
252 .mldv1_unsolicited_report_interval = 10 * HZ,
253 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 254 .dad_transmits = 1,
255 .rtr_solicits = MAX_RTR_SOLICITATIONS,
256 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 257 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 258 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 259 .use_tempaddr = 0,
260 .temp_valid_lft = TEMP_VALID_LIFETIME,
261 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
262 .regen_max_retry = REGEN_MAX_RETRY,
263 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 264 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 265 .accept_ra_defrtr = 1,
d9333196 266 .accept_ra_from_local = 0,
8013d1d7 267 .accept_ra_min_hop_limit= 1,
c4fd30eb 268 .accept_ra_pinfo = 1,
930d6ff2
YH		 269#ifdef CONFIG_IPV6_ROUTER_PREF
270 .accept_ra_rtr_pref = 1,
52e16356 271 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 272#ifdef CONFIG_IPV6_ROUTE_INFO
273 .accept_ra_rt_info_max_plen = 0,
274#endif
930d6ff2 275#endif
fbea49e1 276 .proxy_ndp = 0,
0bcbc926 277 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 278 .disable_ipv6 = 0,
1b34be74 279 .accept_dad = 1,
b800c3b9 280 .suppress_frag_ndisc = 1,
c2943f14 281 .accept_ra_mtu = 1,
3d1bec99
HFS		 282 .stable_secret = {
283 .initialized = false,
284 },
3985e8a3 285 .use_oif_addrs_only = 0,
35103d11 286 .ignore_routes_with_linkdown = 0,
f1705ec1 287 .keep_addr_on_down = 0,
1da177e4
LT		 288};
289
f24e3d65 290/* Check if a valid qdisc is available */
05297949 291static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 292{
05297949 293 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 294}
295
b7b1bfce 296static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 297{
b7b1bfce
HFS		 298 if (del_timer(&idev->rs_timer))
299 __in6_dev_put(idev);
300}
301
c15b1cca 302static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 303{
c15b1cca 304 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 305 __in6_ifa_put(ifp);
306}
307
b7b1bfce
HFS		 308static void addrconf_mod_rs_timer(struct inet6_dev *idev,
309 unsigned long when)
310{
311 if (!timer_pending(&idev->rs_timer))
312 in6_dev_hold(idev);
313 mod_timer(&idev->rs_timer, jiffies + when);
314}
1da177e4 315
c15b1cca
HFS		 316static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
317 unsigned long delay)
1da177e4 318{
c15b1cca 319 if (!delayed_work_pending(&ifp->dad_work))
1da177e4 320 in6_ifa_hold(ifp);
c15b1cca 321 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
1da177e4
LT		 322}
323
7f7d9a6b
HX		 324static int snmp6_alloc_dev(struct inet6_dev *idev)
325{
827da44c
JS		 326 int i;
327
698365fa
WC		 328 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
329 if (!idev->stats.ipv6)
7f7d9a6b 330 goto err_ip;
827da44c
JS		 331
332 for_each_possible_cpu(i) {
333 struct ipstats_mib *addrconf_stats;
698365fa 334 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 335 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 336 }
337
338
be281e55
ED		 339 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
340 GFP_KERNEL);
341 if (!idev->stats.icmpv6dev)
7f7d9a6b 342 goto err_icmp;
be281e55
ED		 343 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
344 GFP_KERNEL);
345 if (!idev->stats.icmpv6msgdev)
14878f75 346 goto err_icmpmsg;
7f7d9a6b
HX		 347
348 return 0;
349
14878f75 350err_icmpmsg:
be281e55 351 kfree(idev->stats.icmpv6dev);
7f7d9a6b 352err_icmp:
698365fa 353 free_percpu(idev->stats.ipv6);
7f7d9a6b 354err_ip:
aaf70ec7 355 return -ENOMEM;
7f7d9a6b
HX		 356}
357
8e5e8f30 358static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 359{
360 struct inet6_dev *ndev;
a317a2f1 361 int err = -ENOMEM;
1da177e4
LT		 362
363 ASSERT_RTNL();
364
365 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 366 return ERR_PTR(-EINVAL);
1da177e4 367
1ab1457c 368 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
63159f29 369 if (!ndev)
a317a2f1 370 return ERR_PTR(err);
322f74a4
IO		 371
372 rwlock_init(&ndev->lock);
373 ndev->dev = dev;
502a2ffd 374 INIT_LIST_HEAD(&ndev->addr_list);
b7b1bfce
HFS		 375 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
376 (unsigned long)ndev);
c346dca1 377 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
9b29c696
HFS		 378
379 if (ndev->cnf.stable_secret.initialized)
380 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
381 else
382 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64;
383
322f74a4 384 ndev->cnf.mtu6 = dev->mtu;
322f74a4 385 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
63159f29 386 if (!ndev->nd_parms) {
322f74a4 387 kfree(ndev);
a317a2f1 388 return ERR_PTR(err);
322f74a4 389 }
0187bdfb
BH		 390 if (ndev->cnf.forwarding)
391 dev_disable_lro(dev);
322f74a4
IO		 392 /* We refer to the device */
393 dev_hold(dev);
1da177e4 394
322f74a4 395 if (snmp6_alloc_dev(ndev) < 0) {
ba3542e1 396 ADBG(KERN_WARNING
f3213831 397 "%s: cannot allocate memory for statistics; dev=%s.\n",
ba3542e1 398 __func__, dev->name);
322f74a4 399 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 400 dev_put(dev);
401 kfree(ndev);
a317a2f1 402 return ERR_PTR(err);
322f74a4 403 }
1da177e4 404
322f74a4 405 if (snmp6_register_dev(ndev) < 0) {
ba3542e1 406 ADBG(KERN_WARNING
f3213831 407 "%s: cannot create /proc/net/dev_snmp6/%s\n",
ba3542e1 408 __func__, dev->name);
a317a2f1 409 goto err_release;
322f74a4
IO		 410 }
411
412 /* One reference from device. We must do this before
413 * we invoke __ipv6_regen_rndid().
414 */
415 in6_dev_hold(ndev);
1da177e4 416
1b34be74
YH		 417 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
418 ndev->cnf.accept_dad = -1;
419
07a93626 420#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 421 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 422 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 423 ndev->cnf.rtr_solicits = 0;
424 }
425#endif
426
372e6c8f 427 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 428 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 429 if ((dev->flags&IFF_LOOPBACK) ||
430 dev->type == ARPHRD_TUNNEL ||
9625ed72 431 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 432 dev->type == ARPHRD_SIT ||
0be669bb 433 dev->type == ARPHRD_NONE) {
322f74a4
IO		 434 ndev->cnf.use_tempaddr = -1;
435 } else {
436 in6_dev_hold(ndev);
437 ipv6_regen_rndid((unsigned long) ndev);
438 }
5d9efa7e 439
914faa14 440 ndev->token = in6addr_any;
1da177e4 441
f24e3d65 442 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 443 ndev->if_flags |= IF_READY;
444
322f74a4
IO		 445 ipv6_mc_init_dev(ndev);
446 ndev->tstamp = jiffies;
a317a2f1
WC		 447 err = addrconf_sysctl_register(ndev);
448 if (err) {
449 ipv6_mc_destroy_dev(ndev);
450 del_timer(&ndev->regen_timer);
2a189f9e 451 snmp6_unregister_dev(ndev);
a317a2f1
WC		 452 goto err_release;
453 }
30c4cf57 454 /* protected by rtnl_lock */
cf778b00 455 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 456
2c5e8933
HFS		 457 /* Join interface-local all-node multicast group */
458 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
459
d88ae4cc 460 /* Join all-node multicast group */
f3ee4010 461 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 462
d6ddef9e 463 /* Join all-router multicast group if forwarding is set */
8b2aaede 464 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 465 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
466
1da177e4 467 return ndev;
a317a2f1
WC		 468
469err_release:
470 neigh_parms_release(&nd_tbl, ndev->nd_parms);
471 ndev->dead = 1;
472 in6_dev_finish_destroy(ndev);
473 return ERR_PTR(err);
1da177e4
LT		 474}
475
8e5e8f30 476static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 477{
478 struct inet6_dev *idev;
479
480 ASSERT_RTNL();
481
e21e8467
SH		 482 idev = __in6_dev_get(dev);
483 if (!idev) {
484 idev = ipv6_add_dev(dev);
a317a2f1 485 if (IS_ERR(idev))
1da177e4
LT		 486 return NULL;
487 }
c5e33bdd 488
1da177e4
LT		 489 if (dev->flags&IFF_UP)
490 ipv6_mc_up(idev);
491 return idev;
492}
493
f3a1bfb1
ND		 494static int inet6_netconf_msgsize_devconf(int type)
495{
496 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
497 + nla_total_size(4); /* NETCONFA_IFINDEX */
136ba622 498 bool all = false;
f3a1bfb1 499
136ba622
ZS		 500 if (type == NETCONFA_ALL)
501 all = true;
502
503 if (all || type == NETCONFA_FORWARDING)
f3a1bfb1 504 size += nla_total_size(4);
b1afce95 505#ifdef CONFIG_IPV6_MROUTE
136ba622 506 if (all || type == NETCONFA_MC_FORWARDING)
d67b8c61 507 size += nla_total_size(4);
b1afce95 508#endif
136ba622 509 if (all || type == NETCONFA_PROXY_NEIGH)
c92d5491 510 size += nla_total_size(4);
f3a1bfb1 511
136ba622 512 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
35103d11
AG		 513 size += nla_total_size(4);
514
f3a1bfb1
ND		 515 return size;
516}
517
518static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
519 struct ipv6_devconf *devconf, u32 portid,
520 u32 seq, int event, unsigned int flags,
521 int type)
522{
523 struct nlmsghdr *nlh;
524 struct netconfmsg *ncm;
136ba622 525 bool all = false;
f3a1bfb1
ND		 526
527 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
528 flags);
63159f29 529 if (!nlh)
f3a1bfb1
ND		 530 return -EMSGSIZE;
531
136ba622
ZS		 532 if (type == NETCONFA_ALL)
533 all = true;
534
f3a1bfb1
ND		 535 ncm = nlmsg_data(nlh);
536 ncm->ncm_family = AF_INET6;
537
538 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
539 goto nla_put_failure;
540
136ba622 541 if ((all || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 542 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
543 goto nla_put_failure;
b1afce95 544#ifdef CONFIG_IPV6_MROUTE
136ba622 545 if ((all || type == NETCONFA_MC_FORWARDING) &&
d67b8c61
ND		 546 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
547 devconf->mc_forwarding) < 0)
548 goto nla_put_failure;
b1afce95 549#endif
136ba622 550 if ((all || type == NETCONFA_PROXY_NEIGH) &&
c92d5491 551 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
552 goto nla_put_failure;
553
136ba622 554 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
35103d11
AG		 555 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
556 devconf->ignore_routes_with_linkdown) < 0)
557 goto nla_put_failure;
558
053c095a
JB		 559 nlmsg_end(skb, nlh);
560 return 0;
f3a1bfb1
ND		 561
562nla_put_failure:
563 nlmsg_cancel(skb, nlh);
564 return -EMSGSIZE;
565}
566
d67b8c61
ND		 567void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
568 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 569{
570 struct sk_buff *skb;
571 int err = -ENOBUFS;
572
927265bc 573 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
63159f29 574 if (!skb)
f3a1bfb1
ND		 575 goto errout;
576
577 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
578 RTM_NEWNETCONF, 0, type);
579 if (err < 0) {
580 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
581 WARN_ON(err == -EMSGSIZE);
582 kfree_skb(skb);
583 goto errout;
584 }
927265bc 585 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
f3a1bfb1
ND		 586 return;
587errout:
bd779028 588 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 589}
590
76f8f6cb
ND		 591static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
592 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
593 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 594 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
35103d11 595 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
76f8f6cb
ND		 596};
597
598static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 599 struct nlmsghdr *nlh)
76f8f6cb
ND		 600{
601 struct net *net = sock_net(in_skb->sk);
602 struct nlattr *tb[NETCONFA_MAX+1];
603 struct netconfmsg *ncm;
604 struct sk_buff *skb;
605 struct ipv6_devconf *devconf;
606 struct inet6_dev *in6_dev;
607 struct net_device *dev;
608 int ifindex;
609 int err;
610
611 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
612 devconf_ipv6_policy);
613 if (err < 0)
614 goto errout;
615
a97eb33f 616 err = -EINVAL;
76f8f6cb
ND		 617 if (!tb[NETCONFA_IFINDEX])
618 goto errout;
619
620 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
621 switch (ifindex) {
622 case NETCONFA_IFINDEX_ALL:
623 devconf = net->ipv6.devconf_all;
624 break;
625 case NETCONFA_IFINDEX_DEFAULT:
626 devconf = net->ipv6.devconf_dflt;
627 break;
628 default:
629 dev = __dev_get_by_index(net, ifindex);
63159f29 630 if (!dev)
76f8f6cb
ND		 631 goto errout;
632 in6_dev = __in6_dev_get(dev);
63159f29 633 if (!in6_dev)
76f8f6cb
ND		 634 goto errout;
635 devconf = &in6_dev->cnf;
636 break;
637 }
638
639 err = -ENOBUFS;
136ba622 640 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
63159f29 641 if (!skb)
76f8f6cb
ND		 642 goto errout;
643
644 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
645 NETLINK_CB(in_skb).portid,
646 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
136ba622 647 NETCONFA_ALL);
76f8f6cb
ND		 648 if (err < 0) {
649 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
650 WARN_ON(err == -EMSGSIZE);
651 kfree_skb(skb);
652 goto errout;
653 }
654 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
655errout:
656 return err;
657}
658
7a674200
ND		 659static int inet6_netconf_dump_devconf(struct sk_buff *skb,
660 struct netlink_callback *cb)
661{
662 struct net *net = sock_net(skb->sk);
663 int h, s_h;
664 int idx, s_idx;
665 struct net_device *dev;
666 struct inet6_dev *idev;
667 struct hlist_head *head;
668
669 s_h = cb->args[0];
670 s_idx = idx = cb->args[1];
671
672 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
673 idx = 0;
674 head = &net->dev_index_head[h];
675 rcu_read_lock();
63998ac2
ND		 676 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
677 net->dev_base_seq;
7a674200
ND		 678 hlist_for_each_entry_rcu(dev, head, index_hlist) {
679 if (idx < s_idx)
680 goto cont;
681 idev = __in6_dev_get(dev);
682 if (!idev)
683 goto cont;
684
685 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
686 &idev->cnf,
687 NETLINK_CB(cb->skb).portid,
688 cb->nlh->nlmsg_seq,
689 RTM_NEWNETCONF,
690 NLM_F_MULTI,
136ba622 691 NETCONFA_ALL) < 0) {
7a674200
ND		 692 rcu_read_unlock();
693 goto done;
694 }
63998ac2 695 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 696cont:
697 idx++;
698 }
699 rcu_read_unlock();
700 }
701 if (h == NETDEV_HASHENTRIES) {
702 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
703 net->ipv6.devconf_all,
704 NETLINK_CB(cb->skb).portid,
705 cb->nlh->nlmsg_seq,
706 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 707 NETCONFA_ALL) < 0)
7a674200
ND		 708 goto done;
709 else
710 h++;
711 }
712 if (h == NETDEV_HASHENTRIES + 1) {
713 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
714 net->ipv6.devconf_dflt,
715 NETLINK_CB(cb->skb).portid,
716 cb->nlh->nlmsg_seq,
717 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 718 NETCONFA_ALL) < 0)
7a674200
ND		 719 goto done;
720 else
721 h++;
722 }
723done:
724 cb->args[0] = h;
725 cb->args[1] = idx;
726
727 return skb->len;
728}
729
1da177e4
LT		 730#ifdef CONFIG_SYSCTL
731static void dev_forward_change(struct inet6_dev *idev)
732{
733 struct net_device *dev;
734 struct inet6_ifaddr *ifa;
1da177e4
LT		 735
736 if (!idev)
737 return;
738 dev = idev->dev;
0187bdfb
BH		 739 if (idev->cnf.forwarding)
740 dev_disable_lro(dev);
1a940835 741 if (dev->flags & IFF_MULTICAST) {
2c5e8933 742 if (idev->cnf.forwarding) {
f3ee4010 743 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 744 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
745 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
746 } else {
f3ee4010 747 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 748 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
749 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
750 }
1da177e4 751 }
502a2ffd 752
753 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 754 if (ifa->flags&IFA_F_TENTATIVE)
755 continue;
1da177e4
LT		 756 if (idev->cnf.forwarding)
757 addrconf_join_anycast(ifa);
758 else
759 addrconf_leave_anycast(ifa);
760 }
f3a1bfb1
ND		 761 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
762 dev->ifindex, &idev->cnf);
1da177e4
LT		 763}
764
765
e186932b 766static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 767{
768 struct net_device *dev;
769 struct inet6_dev *idev;
770
4acd4945 771 for_each_netdev(net, dev) {
1da177e4
LT		 772 idev = __in6_dev_get(dev);
773 if (idev) {
e186932b
PE		 774 int changed = (!idev->cnf.forwarding) ^ (!newf);
775 idev->cnf.forwarding = newf;
1da177e4
LT		 776 if (changed)
777 dev_forward_change(idev);
778 }
1da177e4 779 }
1da177e4 780}
c8fecf22 781
013d97e9 782static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 783{
bff16c2f 784 struct net *net;
013d97e9
FR		 785 int old;
786
787 if (!rtnl_trylock())
788 return restart_syscall();
bff16c2f
PE		 789
790 net = (struct net *)table->extra2;
013d97e9
FR		 791 old = *p;
792 *p = newf;
b325fddb 793
013d97e9 794 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 795 if ((!newf) ^ (!old))
796 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
797 NETCONFA_IFINDEX_DEFAULT,
798 net->ipv6.devconf_dflt);
013d97e9
FR		 799 rtnl_unlock();
800 return 0;
88af182e 801 }
c8fecf22 802
e186932b 803 if (p == &net->ipv6.devconf_all->forwarding) {
d26c638c
ND		 804 int old_dflt = net->ipv6.devconf_dflt->forwarding;
805
e186932b 806 net->ipv6.devconf_dflt->forwarding = newf;
d26c638c
ND		 807 if ((!newf) ^ (!old_dflt))
808 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
809 NETCONFA_IFINDEX_DEFAULT,
810 net->ipv6.devconf_dflt);
811
e186932b 812 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 813 if ((!newf) ^ (!old))
814 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
815 NETCONFA_IFINDEX_ALL,
816 net->ipv6.devconf_all);
013d97e9 817 } else if ((!newf) ^ (!old))
c8fecf22 818 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 819 rtnl_unlock();
c8fecf22 820
013d97e9 821 if (newf)
7b4da532 822 rt6_purge_dflt_routers(net);
b325fddb 823 return 1;
c8fecf22 824}
35103d11
AG		 825
826static void addrconf_linkdown_change(struct net *net, __s32 newf)
827{
828 struct net_device *dev;
829 struct inet6_dev *idev;
830
831 for_each_netdev(net, dev) {
832 idev = __in6_dev_get(dev);
833 if (idev) {
834 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
835
836 idev->cnf.ignore_routes_with_linkdown = newf;
837 if (changed)
838 inet6_netconf_notify_devconf(dev_net(dev),
839 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
840 dev->ifindex,
841 &idev->cnf);
842 }
843 }
844}
845
846static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
847{
848 struct net *net;
849 int old;
850
851 if (!rtnl_trylock())
852 return restart_syscall();
853
854 net = (struct net *)table->extra2;
855 old = *p;
856 *p = newf;
857
858 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
859 if ((!newf) ^ (!old))
860 inet6_netconf_notify_devconf(net,
861 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
862 NETCONFA_IFINDEX_DEFAULT,
863 net->ipv6.devconf_dflt);
864 rtnl_unlock();
865 return 0;
866 }
867
868 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
869 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
870 addrconf_linkdown_change(net, newf);
871 if ((!newf) ^ (!old))
872 inet6_netconf_notify_devconf(net,
873 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
874 NETCONFA_IFINDEX_ALL,
875 net->ipv6.devconf_all);
876 }
877 rtnl_unlock();
878
879 return 1;
880}
881
1da177e4
LT		 882#endif
883
5c578aed 884/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 885void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
886{
c2e21293 887 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 888
1da177e4 889#ifdef NET_REFCNT_DEBUG
91df42be 890 pr_debug("%s\n", __func__);
1da177e4
LT		 891#endif
892
893 in6_dev_put(ifp->idev);
894
c15b1cca
HFS		 895 if (cancel_delayed_work(&ifp->dad_work))
896 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
897 ifp);
1da177e4 898
e9d3e084 899 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 900 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 901 return;
902 }
94e187c0 903 ip6_rt_put(ifp->rt);
1da177e4 904
e5785985 905 kfree_rcu(ifp, rcu);
1da177e4
LT		 906}
907
e55ffac6
BH		 908static void
909ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
910{
502a2ffd 911 struct list_head *p;
8a6ce0c0 912 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 913
914 /*
915 * Each device address list is sorted in order of scope -
916 * global before linklocal.
917 */
502a2ffd 918 list_for_each(p, &idev->addr_list) {
919 struct inet6_ifaddr *ifa
920 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 921 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 922 break;
923 }
924
b54c9b98 925 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 926}
927
ddbe5032 928static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 929{
ddbe5032 930 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 931}
932
1da177e4
LT		 933/* On success it returns ifp with increased reference count */
934
935static struct inet6_ifaddr *
3f8f5298
JP		 936ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
937 const struct in6_addr *peer_addr, int pfxlen,
8a226b2c 938 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
1da177e4
LT		 939{
940 struct inet6_ifaddr *ifa = NULL;
941 struct rt6_info *rt;
3a88a81d 942 unsigned int hash;
1da177e4 943 int err = 0;
d68b8270
YH		 944 int addr_type = ipv6_addr_type(addr);
945
946 if (addr_type == IPV6_ADDR_ANY ||
947 addr_type & IPV6_ADDR_MULTICAST ||
948 (!(idev->dev->flags & IFF_LOOPBACK) &&
949 addr_type & IPV6_ADDR_LOOPBACK))
950 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 951
8814c4b5 952 rcu_read_lock_bh();
1da177e4
LT		 953 if (idev->dead) {
954 err = -ENODEV; /*XXX*/
955 goto out2;
956 }
957
56d417b1 958 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 959 err = -EACCES;
960 goto out2;
961 }
962
5c578aed 963 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 964
965 /* Ignore adding duplicate addresses on an interface */
c346dca1 966 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ba3542e1 967 ADBG("ipv6_add_addr: already assigned\n");
1da177e4
LT		 968 err = -EEXIST;
969 goto out;
970 }
971
322f74a4 972 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4 973
63159f29 974 if (!ifa) {
ba3542e1 975 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 976 err = -ENOBUFS;
977 goto out;
978 }
979
8f031519 980 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 981 if (IS_ERR(rt)) {
982 err = PTR_ERR(rt);
983 goto out;
984 }
985
bba24896
JP		 986 neigh_parms_data_state_setall(idev->nd_parms);
987
4e3fd7a0 988 ifa->addr = *addr;
3f8f5298
JP		 989 if (peer_addr)
990 ifa->peer_addr = *peer_addr;
1da177e4
LT		 991
992 spin_lock_init(&ifa->lock);
c15b1cca 993 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 994 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 995 ifa->scope = scope;
996 ifa->prefix_len = pfxlen;
997 ifa->flags = flags | IFA_F_TENTATIVE;
8a226b2c
JB		 998 ifa->valid_lft = valid_lft;
999 ifa->prefered_lft = prefered_lft;
1da177e4 1000 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 1001 ifa->tokenized = false;
1da177e4 1002
57f5f544
KF		 1003 ifa->rt = rt;
1004
1da177e4
LT		 1005 ifa->idev = idev;
1006 in6_dev_hold(idev);
1007 /* For caller */
1008 in6_ifa_hold(ifa);
1009
1010 /* Add to big hash table */
ddbe5032 1011 hash = inet6_addr_hash(addr);
1da177e4 1012
5c578aed 1013 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 1014 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 1015
1016 write_lock(&idev->lock);
1017 /* Add to inet6_dev unicast addr list. */
e55ffac6 1018 ipv6_link_dev_addr(idev, ifa);
1da177e4 1019
1da177e4 1020 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 1021 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 1022 in6_ifa_hold(ifa);
1023 }
1da177e4 1024
1da177e4
LT		 1025 in6_ifa_hold(ifa);
1026 write_unlock(&idev->lock);
1027out2:
8814c4b5 1028 rcu_read_unlock_bh();
1da177e4 1029
fd92833a 1030 if (likely(err == 0))
f88c91dd 1031 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 1032 else {
1033 kfree(ifa);
1034 ifa = ERR_PTR(err);
1035 }
1036
1037 return ifa;
1038out:
5c578aed 1039 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 1040 goto out2;
1041}
1042
5b84efec
TH		 1043enum cleanup_prefix_rt_t {
1044 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1045 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1046 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1047};
1048
1049/*
1050 * Check, whether the prefix for ifp would still need a prefix route
1051 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1052 * constants.
1053 *
1054 * 1) we don't purge prefix if address was not permanent.
1055 * prefix is managed by its own lifetime.
1056 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1057 * 3) if there are no addresses, delete prefix.
1058 * 4) if there are still other permanent address(es),
1059 * corresponding prefix is still permanent.
1060 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1061 * don't purge the prefix, assume user space is managing it.
1062 * 6) otherwise, update prefix lifetime to the
1063 * longest valid lifetime among the corresponding
1064 * addresses on the device.
1065 * Note: subsequent RA will update lifetime.
1066 **/
1067static enum cleanup_prefix_rt_t
1068check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1069{
1070 struct inet6_ifaddr *ifa;
1071 struct inet6_dev *idev = ifp->idev;
1072 unsigned long lifetime;
1073 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1074
1075 *expires = jiffies;
1076
1077 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1078 if (ifa == ifp)
1079 continue;
1080 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1081 ifp->prefix_len))
1082 continue;
1083 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1084 return CLEANUP_PREFIX_RT_NOP;
1085
1086 action = CLEANUP_PREFIX_RT_EXPIRE;
1087
1088 spin_lock(&ifa->lock);
1089
1090 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1091 /*
1092 * Note: Because this address is
1093 * not permanent, lifetime <
1094 * LONG_MAX / HZ here.
1095 */
1096 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1097 *expires = ifa->tstamp + lifetime * HZ;
1098 spin_unlock(&ifa->lock);
1099 }
1100
1101 return action;
1102}
1103
1104static void
1105cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1106{
1107 struct rt6_info *rt;
1108
1109 rt = addrconf_get_prefix_route(&ifp->addr,
1110 ifp->prefix_len,
1111 ifp->idev->dev,
1112 0, RTF_GATEWAY | RTF_DEFAULT);
1113 if (rt) {
1114 if (del_rt)
1115 ip6_del_rt(rt);
1116 else {
1117 if (!(rt->rt6i_flags & RTF_EXPIRES))
1118 rt6_set_expires(rt, expires);
1119 ip6_rt_put(rt);
1120 }
1121 }
1122}
1123
1124
1da177e4
LT		 1125/* This function wants to get referenced ifp and releases it before return */
1126
1127static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1128{
4c5ff6a6 1129 int state;
5b84efec
TH		 1130 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1131 unsigned long expires;
1da177e4 1132
c15b1cca
HFS		 1133 ASSERT_RTNL();
1134
8e8e676d 1135 spin_lock_bh(&ifp->lock);
4c5ff6a6 1136 state = ifp->state;
e9d3e084 1137 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1138 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1139
1140 if (state == INET6_IFADDR_STATE_DEAD)
1141 goto out;
1da177e4 1142
5c578aed 1143 spin_lock_bh(&addrconf_hash_lock);
1144 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1145 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1146
5b84efec 1147 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1148
1da177e4 1149 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1150 list_del(&ifp->tmp_list);
1151 if (ifp->ifpub) {
1152 in6_ifa_put(ifp->ifpub);
1153 ifp->ifpub = NULL;
1da177e4 1154 }
372e6c8f 1155 __in6_ifa_put(ifp);
1da177e4 1156 }
1da177e4 1157
5b84efec
TH		 1158 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1159 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1160
5b84efec
TH		 1161 list_del_init(&ifp->if_list);
1162 __in6_ifa_put(ifp);
1163
1164 write_unlock_bh(&ifp->idev->lock);
1da177e4 1165
c15b1cca 1166 addrconf_del_dad_work(ifp);
b2238566 1167
1da177e4
LT		 1168 ipv6_ifa_notify(RTM_DELADDR, ifp);
1169
f88c91dd 1170 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1171
5b84efec
TH		 1172 if (action != CLEANUP_PREFIX_RT_NOP) {
1173 cleanup_prefix_route(ifp, expires,
1174 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1175 }
1176
c3968a85
DW		 1177 /* clean up prefsrc entries */
1178 rt6_remove_prefsrc(ifp);
4c5ff6a6 1179out:
1da177e4
LT		 1180 in6_ifa_put(ifp);
1181}
1182
1da177e4
LT		 1183static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1184{
1185 struct inet6_dev *idev = ifp->idev;
1186 struct in6_addr addr, *tmpaddr;
76f793e3 1187 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1188 unsigned long regen_advance;
1da177e4
LT		 1189 int tmp_plen;
1190 int ret = 0;
95c385b4 1191 u32 addr_flags;
76f793e3 1192 unsigned long now = jiffies;
1da177e4 1193
53bd6749 1194 write_lock_bh(&idev->lock);
1da177e4
LT		 1195 if (ift) {
1196 spin_lock_bh(&ift->lock);
1197 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1198 spin_unlock_bh(&ift->lock);
1199 tmpaddr = &addr;
1200 } else {
1201 tmpaddr = NULL;
1202 }
1203retry:
1204 in6_dev_hold(idev);
1205 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1206 write_unlock_bh(&idev->lock);
f3213831 1207 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1208 in6_dev_put(idev);
1209 ret = -1;
1210 goto out;
1211 }
1212 spin_lock_bh(&ifp->lock);
1213 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1214 idev->cnf.use_tempaddr = -1; /*XXX*/
1215 spin_unlock_bh(&ifp->lock);
53bd6749 1216 write_unlock_bh(&idev->lock);
f3213831
JP		 1217 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1218 __func__);
1da177e4
LT		 1219 in6_dev_put(idev);
1220 ret = -1;
1221 goto out;
1222 }
1223 in6_ifa_hold(ifp);
1224 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 1225 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1226 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1227 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 1228 tmp_valid_lft = min_t(__u32,
1229 ifp->valid_lft,
7a876b0e 1230 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 1231 tmp_prefered_lft = min_t(__u32,
1232 ifp->prefered_lft,
7a876b0e 1233 idev->cnf.temp_prefered_lft + age -
784e2710 1234 idev->cnf.max_desync_factor);
1da177e4 1235 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1236 tmp_tstamp = ifp->tstamp;
1237 spin_unlock_bh(&ifp->lock);
1238
eac55bf9 1239 regen_advance = idev->cnf.regen_max_retry *
67ba4152
IM		 1240 idev->cnf.dad_transmits *
1241 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
53bd6749 1242 write_unlock_bh(&idev->lock);
95c385b4 1243
eac55bf9
BB		 1244 /* A temporary address is created only if this calculated Preferred
1245 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1246 * an implementation must not create a temporary address with a zero
1247 * Preferred Lifetime.
ecab6701
HK		 1248 * Use age calculation as in addrconf_verify to avoid unnecessary
1249 * temporary addresses being generated.
eac55bf9 1250 */
ecab6701
HK		 1251 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1252 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1253 in6_ifa_put(ifp);
1254 in6_dev_put(idev);
1255 ret = -1;
1256 goto out;
1257 }
1258
95c385b4
NH		 1259 addr_flags = IFA_F_TEMPORARY;
1260 /* set in addrconf_prefix_rcv() */
1261 if (ifp->flags & IFA_F_OPTIMISTIC)
1262 addr_flags |= IFA_F_OPTIMISTIC;
1263
4b08a8f1
HFS		 1264 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1265 ipv6_addr_scope(&addr), addr_flags,
1266 tmp_valid_lft, tmp_prefered_lft);
1267 if (IS_ERR(ift)) {
1da177e4
LT		 1268 in6_ifa_put(ifp);
1269 in6_dev_put(idev);
f3213831 1270 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1271 tmpaddr = &addr;
53bd6749 1272 write_lock_bh(&idev->lock);
1da177e4
LT		 1273 goto retry;
1274 }
1275
1276 spin_lock_bh(&ift->lock);
1277 ift->ifpub = ifp;
76f793e3 1278 ift->cstamp = now;
1da177e4
LT		 1279 ift->tstamp = tmp_tstamp;
1280 spin_unlock_bh(&ift->lock);
1281
cf22f9a2 1282 addrconf_dad_start(ift);
1da177e4
LT		 1283 in6_ifa_put(ift);
1284 in6_dev_put(idev);
1285out:
1286 return ret;
1287}
1da177e4
LT		 1288
1289/*
072047e4 1290 * Choose an appropriate source address (RFC3484)
1da177e4 1291 */
a9b05723
YH		 1292enum {
1293 IPV6_SADDR_RULE_INIT = 0,
1294 IPV6_SADDR_RULE_LOCAL,
1295 IPV6_SADDR_RULE_SCOPE,
1296 IPV6_SADDR_RULE_PREFERRED,
1297#ifdef CONFIG_IPV6_MIP6
1298 IPV6_SADDR_RULE_HOA,
1299#endif
1300 IPV6_SADDR_RULE_OIF,
1301 IPV6_SADDR_RULE_LABEL,
a9b05723 1302 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1303 IPV6_SADDR_RULE_ORCHID,
1304 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1305#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1306 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1307#endif
a9b05723
YH		 1308 IPV6_SADDR_RULE_MAX
1309};
1310
072047e4 1311struct ipv6_saddr_score {
a9b05723
YH		 1312 int rule;
1313 int addr_type;
1314 struct inet6_ifaddr *ifa;
1315 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1316 int scopedist;
1317 int matchlen;
072047e4
YH		 1318};
1319
a9b05723 1320struct ipv6_saddr_dst {
9acd9f3a 1321 const struct in6_addr *addr;
a9b05723
YH		 1322 int ifindex;
1323 int scope;
1324 int label;
7cbca67c 1325 unsigned int prefs;
a9b05723 1326};
072047e4 1327
b6f99a21 1328static inline int ipv6_saddr_preferred(int type)
1da177e4 1329{
45bb0060 1330 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1331 return 1;
1332 return 0;
1da177e4
LT		 1333}
1334
7fd2561e
EK		 1335static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1336{
1337#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1338 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1339#else
1340 return false;
1341#endif
1342}
1343
3de23255
BT		 1344static int ipv6_get_saddr_eval(struct net *net,
1345 struct ipv6_saddr_score *score,
a9b05723
YH		 1346 struct ipv6_saddr_dst *dst,
1347 int i)
1348{
1349 int ret;
1350
1351 if (i <= score->rule) {
1352 switch (i) {
1353 case IPV6_SADDR_RULE_SCOPE:
1354 ret = score->scopedist;
1355 break;
1356 case IPV6_SADDR_RULE_PREFIX:
1357 ret = score->matchlen;
1358 break;
1359 default:
1360 ret = !!test_bit(i, score->scorebits);
1361 }
1362 goto out;
1363 }
1364
1365 switch (i) {
1366 case IPV6_SADDR_RULE_INIT:
1367 /* Rule 0: remember if hiscore is not ready yet */
1368 ret = !!score->ifa;
1369 break;
1370 case IPV6_SADDR_RULE_LOCAL:
1371 /* Rule 1: Prefer same address */
1372 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1373 break;
1374 case IPV6_SADDR_RULE_SCOPE:
1375 /* Rule 2: Prefer appropriate scope
1376 *
1377 * ret
1378 * ^
1379 * -1 | d 15
1380 * ---+--+-+---> scope
1381 * |
1382 * | d is scope of the destination.
1383 * B-d | \
1384 * | \ <- smaller scope is better if
db9c7c39 1385 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1386 * | ret = B - scope (-1 <= scope >= d <= 15).
1387 * d-C-1 | /
1388 * |/ <- greater is better
1389 * -C / if scope is not enough for destination.
1390 * /| ret = scope - C (-1 <= d < scope <= 15).
1391 *
1392 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1393 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1394 * Assume B = 0 and we get C > 29.
1395 */
1396 ret = __ipv6_addr_src_scope(score->addr_type);
1397 if (ret >= dst->scope)
1398 ret = -ret;
1399 else
1400 ret -= 128; /* 30 is enough */
1401 score->scopedist = ret;
1402 break;
1403 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1404 {
a9b05723 1405 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1406 u8 avoid = IFA_F_DEPRECATED;
1407
1408 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1409 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1410 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1411 !(score->ifa->flags & avoid);
a9b05723 1412 break;
7fd2561e 1413 }
a9b05723
YH		 1414#ifdef CONFIG_IPV6_MIP6
1415 case IPV6_SADDR_RULE_HOA:
7cbca67c 1416 {
a9b05723 1417 /* Rule 4: Prefer home address */
7cbca67c
YH		 1418 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1419 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1420 break;
7cbca67c 1421 }
a9b05723
YH		 1422#endif
1423 case IPV6_SADDR_RULE_OIF:
1424 /* Rule 5: Prefer outgoing interface */
1425 ret = (!dst->ifindex ||
1426 dst->ifindex == score->ifa->idev->dev->ifindex);
1427 break;
1428 case IPV6_SADDR_RULE_LABEL:
1429 /* Rule 6: Prefer matching label */
3de23255
BT		 1430 ret = ipv6_addr_label(net,
1431 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1432 score->ifa->idev->dev->ifindex) == dst->label;
1433 break;
a9b05723 1434 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1435 {
a9b05723 1436 /* Rule 7: Prefer public address
25985edc 1437 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1438 */
7cbca67c
YH		 1439 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1440 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1441 score->ifa->idev->cnf.use_tempaddr >= 2;
1442 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1443 break;
7cbca67c 1444 }
a9b05723
YH		 1445 case IPV6_SADDR_RULE_ORCHID:
1446 /* Rule 8-: Prefer ORCHID vs ORCHID or
1447 * non-ORCHID vs non-ORCHID
1448 */
1449 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1450 ipv6_addr_orchid(dst->addr));
1451 break;
1452 case IPV6_SADDR_RULE_PREFIX:
1453 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1454 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1455 if (ret > score->ifa->prefix_len)
1456 ret = score->ifa->prefix_len;
1457 score->matchlen = ret;
a9b05723 1458 break;
7fd2561e
EK		 1459#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1460 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1461 /* Optimistic addresses still have lower precedence than other
1462 * preferred addresses.
1463 */
1464 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1465 break;
1466#endif
a9b05723
YH		 1467 default:
1468 ret = 0;
1469 }
1470
1471 if (ret)
1472 __set_bit(i, score->scorebits);
1473 score->rule = i;
1474out:
1475 return ret;
1476}
1477
c0b8da1e
YH		 1478static int __ipv6_dev_get_saddr(struct net *net,
1479 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1480 struct inet6_dev *idev,
1481 struct ipv6_saddr_score *scores,
1482 int hiscore_idx)
9131f3de 1483{
c0b8da1e 1484 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de
YH		 1485
1486 read_lock_bh(&idev->lock);
1487 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1488 int i;
1489
1490 /*
1491 * - Tentative Address (RFC2462 section 5.4)
1492 * - A tentative address is not considered
1493 * "assigned to an interface" in the traditional
1494 * sense, unless it is also flagged as optimistic.
1495 * - Candidate Source Address (section 4)
1496 * - In any case, anycast addresses, multicast
1497 * addresses, and the unspecified address MUST
1498 * NOT be included in a candidate set.
1499 */
1500 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1501 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1502 continue;
1503
1504 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1505
1506 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1507 score->addr_type & IPV6_ADDR_MULTICAST)) {
1508 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1509 idev->dev->name);
1510 continue;
1511 }
1512
1513 score->rule = -1;
1514 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1515
1516 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1517 int minihiscore, miniscore;
1518
1519 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1520 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1521
1522 if (minihiscore > miniscore) {
1523 if (i == IPV6_SADDR_RULE_SCOPE &&
1524 score->scopedist > 0) {
1525 /*
1526 * special case:
1527 * each remaining entry
1528 * has too small (not enough)
1529 * scope, because ifa entries
1530 * are sorted by their scope
1531 * values.
1532 */
1533 goto out;
1534 }
1535 break;
1536 } else if (minihiscore < miniscore) {
1537 if (hiscore->ifa)
1538 in6_ifa_put(hiscore->ifa);
1539
1540 in6_ifa_hold(score->ifa);
1541
1542 swap(hiscore, score);
c0b8da1e 1543 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1544
1545 /* restore our iterator */
1546 score->ifa = hiscore->ifa;
1547
1548 break;
1549 }
1550 }
1551 }
1552out:
1553 read_unlock_bh(&idev->lock);
c0b8da1e 1554 return hiscore_idx;
9131f3de
YH		 1555}
1556
afbac601
DA		 1557static int ipv6_get_saddr_master(struct net *net,
1558 const struct net_device *dst_dev,
1559 const struct net_device *master,
1560 struct ipv6_saddr_dst *dst,
1561 struct ipv6_saddr_score *scores,
1562 int hiscore_idx)
1563{
1564 struct inet6_dev *idev;
1565
1566 idev = __in6_dev_get(dst_dev);
1567 if (idev)
1568 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1569 scores, hiscore_idx);
1570
1571 idev = __in6_dev_get(master);
1572 if (idev)
1573 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1574 scores, hiscore_idx);
1575
1576 return hiscore_idx;
1577}
1578
b3f644fc 1579int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1580 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1581 struct in6_addr *saddr)
1da177e4 1582{
c0b8da1e 1583 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1584 struct ipv6_saddr_dst dst;
9131f3de 1585 struct inet6_dev *idev;
072047e4 1586 struct net_device *dev;
a9b05723 1587 int dst_type;
9131f3de 1588 bool use_oif_addr = false;
c0b8da1e 1589 int hiscore_idx = 0;
1da177e4 1590
a9b05723
YH		 1591 dst_type = __ipv6_addr_type(daddr);
1592 dst.addr = daddr;
1593 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1594 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1595 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1596 dst.prefs = prefs;
a9b05723 1597
c0b8da1e
YH		 1598 scores[hiscore_idx].rule = -1;
1599 scores[hiscore_idx].ifa = NULL;
1da177e4 1600
8814c4b5 1601 rcu_read_lock();
1da177e4 1602
9131f3de
YH		 1603 /* Candidate Source Address (section 4)
1604 * - multicast and link-local destination address,
1605 * the set of candidate source address MUST only
1606 * include addresses assigned to interfaces
1607 * belonging to the same link as the outgoing
1608 * interface.
1609 * (- For site-local destination addresses, the
1610 * set of candidate source addresses MUST only
1611 * include addresses assigned to interfaces
1612 * belonging to the same site as the outgoing
1613 * interface.)
3985e8a3
EK		 1614 * - "It is RECOMMENDED that the candidate source addresses
1615 * be the set of unicast addresses assigned to the
1616 * interface that will be used to send to the destination
1617 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1618 */
1619 if (dst_dev) {
3985e8a3 1620 idev = __in6_dev_get(dst_dev);
9131f3de 1621 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1622 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1623 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1624 use_oif_addr = true;
1625 }
1626 }
a9b05723 1627
9131f3de 1628 if (use_oif_addr) {
c0b8da1e 1629 if (idev)
c15df306 1630 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de 1631 } else {
afbac601
DA		 1632 const struct net_device *master;
1633 int master_idx = 0;
1634
1635 /* if dst_dev exists and is enslaved to an L3 device, then
1636 * prefer addresses from dst_dev and then the master over
1637 * any other enslaved devices in the L3 domain.
1638 */
1639 master = l3mdev_master_dev_rcu(dst_dev);
1640 if (master) {
1641 master_idx = master->ifindex;
1642
1643 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1644 master, &dst,
1645 scores, hiscore_idx);
1646
1647 if (scores[hiscore_idx].ifa)
1648 goto out;
1649 }
1650
9131f3de 1651 for_each_netdev_rcu(net, dev) {
afbac601
DA		 1652 /* only consider addresses on devices in the
1653 * same L3 domain
1654 */
1655 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1656 continue;
9131f3de
YH		 1657 idev = __in6_dev_get(dev);
1658 if (!idev)
072047e4 1659 continue;
c15df306 1660 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1661 }
1662 }
afbac601
DA		 1663
1664out:
8814c4b5 1665 rcu_read_unlock();
1da177e4 1666
c0b8da1e 1667 hiscore = &scores[hiscore_idx];
a9b05723 1668 if (!hiscore->ifa)
072047e4 1669 return -EADDRNOTAVAIL;
1ab1457c 1670
4e3fd7a0 1671 *saddr = hiscore->ifa->addr;
a9b05723 1672 in6_ifa_put(hiscore->ifa);
072047e4 1673 return 0;
1da177e4 1674}
5e5f3f0f 1675EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1676
8965779d 1677int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1678 u32 banned_flags)
b7b1bfce
HFS		 1679{
1680 struct inet6_ifaddr *ifp;
1681 int err = -EADDRNOTAVAIL;
1682
602582ca
HFS		 1683 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1684 if (ifp->scope > IFA_LINK)
1685 break;
b7b1bfce
HFS		 1686 if (ifp->scope == IFA_LINK &&
1687 !(ifp->flags & banned_flags)) {
1688 *addr = ifp->addr;
1689 err = 0;
1690 break;
1691 }
1692 }
1693 return err;
1694}
1695
95c385b4 1696int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1697 u32 banned_flags)
1da177e4
LT		 1698{
1699 struct inet6_dev *idev;
1700 int err = -EADDRNOTAVAIL;
1701
8814c4b5 1702 rcu_read_lock();
e21e8467
SH		 1703 idev = __in6_dev_get(dev);
1704 if (idev) {
1da177e4 1705 read_lock_bh(&idev->lock);
b7b1bfce 1706 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1707 read_unlock_bh(&idev->lock);
1708 }
8814c4b5 1709 rcu_read_unlock();
1da177e4
LT		 1710 return err;
1711}
1712
1713static int ipv6_count_addresses(struct inet6_dev *idev)
1714{
1715 int cnt = 0;
1716 struct inet6_ifaddr *ifp;
1717
1718 read_lock_bh(&idev->lock);
502a2ffd 1719 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1720 cnt++;
1721 read_unlock_bh(&idev->lock);
1722 return cnt;
1723}
1724
b71d1d42 1725int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1726 const struct net_device *dev, int strict)
c58da4c6
EK		 1727{
1728 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1729}
1730EXPORT_SYMBOL(ipv6_chk_addr);
1731
1732int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1733 const struct net_device *dev, int strict,
1734 u32 banned_flags)
1da177e4 1735{
eedf042a 1736 struct inet6_ifaddr *ifp;
ddbe5032 1737 unsigned int hash = inet6_addr_hash(addr);
c58da4c6 1738 u32 ifp_flags;
1da177e4 1739
5c578aed 1740 rcu_read_lock_bh();
b67bfe0d 1741 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1742 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1743 continue;
c58da4c6
EK		 1744 /* Decouple optimistic from tentative for evaluation here.
1745 * Ban optimistic addresses explicitly, when required.
1746 */
1747 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1748 ? (ifp->flags&~IFA_F_TENTATIVE)
1749 : ifp->flags;
1da177e4 1750 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1751 !(ifp_flags&banned_flags) &&
63159f29 1752 (!dev || ifp->idev->dev == dev ||
eedf042a
SH		 1753 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1754 rcu_read_unlock_bh();
1755 return 1;
1da177e4
LT		 1756 }
1757 }
5c578aed 1758
eedf042a
SH		 1759 rcu_read_unlock_bh();
1760 return 0;
1da177e4 1761}
c58da4c6 1762EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1763
3e81c6da
DM		 1764static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1765 struct net_device *dev)
1da177e4 1766{
ddbe5032 1767 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1768 struct inet6_ifaddr *ifp;
1da177e4 1769
b67bfe0d 1770 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1771 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1772 continue;
1da177e4 1773 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1774 if (!dev || ifp->idev->dev == dev)
3e81c6da 1775 return true;
1da177e4
LT		 1776 }
1777 }
3e81c6da 1778 return false;
1da177e4
LT		 1779}
1780
7df37ff3
CB		 1781/* Compares an address/prefix_len with addresses on device @dev.
1782 * If one is found it returns true.
1783 */
1784bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1785 const unsigned int prefix_len, struct net_device *dev)
1786{
1787 struct inet6_dev *idev;
1788 struct inet6_ifaddr *ifa;
1789 bool ret = false;
1790
1791 rcu_read_lock();
1792 idev = __in6_dev_get(dev);
1793 if (idev) {
1794 read_lock_bh(&idev->lock);
1795 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1796 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1797 if (ret)
1798 break;
1799 }
1800 read_unlock_bh(&idev->lock);
1801 }
1802 rcu_read_unlock();
1803
1804 return ret;
1805}
1806EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1807
b71d1d42 1808int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1809{
1810 struct inet6_dev *idev;
1811 struct inet6_ifaddr *ifa;
1812 int onlink;
1813
1814 onlink = 0;
1815 rcu_read_lock();
1816 idev = __in6_dev_get(dev);
1817 if (idev) {
1818 read_lock_bh(&idev->lock);
502a2ffd 1819 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1820 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1821 ifa->prefix_len);
1822 if (onlink)
1823 break;
1824 }
1825 read_unlock_bh(&idev->lock);
1826 }
1827 rcu_read_unlock();
1828 return onlink;
1829}
52eeeb84
YH		 1830EXPORT_SYMBOL(ipv6_chk_prefix);
1831
9acd9f3a 1832struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1833 struct net_device *dev, int strict)
1da177e4 1834{
b79d1d54 1835 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1836 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1837
5c578aed 1838 rcu_read_lock_bh();
b67bfe0d 1839 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1840 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1841 continue;
1da177e4 1842 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1843 if (!dev || ifp->idev->dev == dev ||
1da177e4 1844 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1845 result = ifp;
1da177e4
LT		 1846 in6_ifa_hold(ifp);
1847 break;
1848 }
1849 }
1850 }
5c578aed 1851 rcu_read_unlock_bh();
1da177e4 1852
b79d1d54 1853 return result;
1da177e4
LT		 1854}
1855
1da177e4
LT		 1856/* Gets referenced address, destroys ifaddr */
1857
cc411d0b 1858static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1859{
3d171f39
LR		 1860 if (dad_failed)
1861 ifp->flags |= IFA_F_DADFAILED;
1862
1da177e4
LT		 1863 if (ifp->flags&IFA_F_PERMANENT) {
1864 spin_lock_bh(&ifp->lock);
c15b1cca 1865 addrconf_del_dad_work(ifp);
1da177e4
LT		 1866 ifp->flags |= IFA_F_TENTATIVE;
1867 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1868 if (dad_failed)
1869 ipv6_ifa_notify(0, ifp);
1da177e4 1870 in6_ifa_put(ifp);
1da177e4
LT		 1871 } else if (ifp->flags&IFA_F_TEMPORARY) {
1872 struct inet6_ifaddr *ifpub;
1873 spin_lock_bh(&ifp->lock);
1874 ifpub = ifp->ifpub;
1875 if (ifpub) {
1876 in6_ifa_hold(ifpub);
1877 spin_unlock_bh(&ifp->lock);
1878 ipv6_create_tempaddr(ifpub, ifp);
1879 in6_ifa_put(ifpub);
1880 } else {
1881 spin_unlock_bh(&ifp->lock);
1882 }
1883 ipv6_del_addr(ifp);
c15b1cca 1884 } else {
1da177e4 1885 ipv6_del_addr(ifp);
c15b1cca 1886 }
1da177e4
LT		 1887}
1888
f2344a13
HX		 1889static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1890{
1891 int err = -ENOENT;
1892
8e8e676d 1893 spin_lock_bh(&ifp->lock);
f2344a13
HX		 1894 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1895 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1896 err = 0;
1897 }
8e8e676d 1898 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 1899
1900 return err;
1901}
1902
3c21edbd
YH		 1903void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1904{
1b34be74 1905 struct inet6_dev *idev = ifp->idev;
1855b7c3 1906 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 1907
853dc2e0
UB		 1908 if (addrconf_dad_end(ifp)) {
1909 in6_ifa_put(ifp);
f2344a13 1910 return;
853dc2e0 1911 }
f2344a13 1912
e87cc472
JP		 1913 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1914 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1915
5f40ef77
HFS		 1916 spin_lock_bh(&ifp->lock);
1917
1918 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1919 int scope = ifp->scope;
1920 u32 flags = ifp->flags;
1921 struct in6_addr new_addr;
1922 struct inet6_ifaddr *ifp2;
1923 u32 valid_lft, preferred_lft;
1924 int pfxlen = ifp->prefix_len;
5f40ef77
HFS		 1925 int retries = ifp->stable_privacy_retry + 1;
1926
1855b7c3 1927 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 1928 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1929 ifp->idev->dev->name);
1930 goto errdad;
1931 }
1932
1933 new_addr = ifp->addr;
1934 if (ipv6_generate_stable_address(&new_addr, retries,
1935 idev))
1936 goto errdad;
1937
1938 valid_lft = ifp->valid_lft;
1939 preferred_lft = ifp->prefered_lft;
1940
1941 spin_unlock_bh(&ifp->lock);
1b34be74 1942
5f40ef77
HFS		 1943 if (idev->cnf.max_addresses &&
1944 ipv6_count_addresses(idev) >=
1945 idev->cnf.max_addresses)
1946 goto lock_errdad;
1947
1948 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1949 ifp->idev->dev->name);
1950
1951 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1952 scope, flags, valid_lft,
1953 preferred_lft);
1954 if (IS_ERR(ifp2))
1955 goto lock_errdad;
1956
1957 spin_lock_bh(&ifp2->lock);
1958 ifp2->stable_privacy_retry = retries;
1959 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1960 spin_unlock_bh(&ifp2->lock);
1961
1855b7c3 1962 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 1963 in6_ifa_put(ifp2);
1964lock_errdad:
1965 spin_lock_bh(&ifp->lock);
1b34be74
YH		 1966 }
1967
5f40ef77 1968errdad:
c15b1cca
HFS		 1969 /* transition from _POSTDAD to _ERRDAD */
1970 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 1971 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 1972
1973 addrconf_mod_dad_work(ifp, 0);
751eb6b6 1974 in6_ifa_put(ifp);
3c21edbd 1975}
1da177e4 1976
a9ed4a29
SD		 1977/* Join to solicited addr multicast group.
1978 * caller must hold RTNL */
b71d1d42 1979void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1980{
1981 struct in6_addr maddr;
1982
1983 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1984 return;
1985
1986 addrconf_addr_solict_mult(addr, &maddr);
1987 ipv6_dev_mc_inc(dev, &maddr);
1988}
1989
a9ed4a29 1990/* caller must hold RTNL */
b71d1d42 1991void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1992{
1993 struct in6_addr maddr;
1994
1995 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1996 return;
1997
1998 addrconf_addr_solict_mult(addr, &maddr);
1999 __ipv6_dev_mc_dec(idev, &maddr);
2000}
2001
a9ed4a29 2002/* caller must hold RTNL */
20380731 2003static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2004{
2005 struct in6_addr addr;
c15b1cca 2006
88ad3149 2007 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 2008 return;
1da177e4
LT		 2009 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2010 if (ipv6_addr_any(&addr))
2011 return;
013b4d90 2012 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 2013}
2014
a9ed4a29 2015/* caller must hold RTNL */
20380731 2016static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2017{
2018 struct in6_addr addr;
c15b1cca 2019
88ad3149 2020 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 2021 return;
1da177e4
LT		 2022 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2023 if (ipv6_addr_any(&addr))
2024 return;
2025 __ipv6_dev_ac_dec(ifp->idev, &addr);
2026}
2027
06a4c1c5 2028static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
2029{
5241c2d7 2030 if (dev->addr_len != EUI64_ADDR_LEN)
06a4c1c5 2031 return -1;
5241c2d7 2032 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
5e98a36e 2033 eui[0] ^= 2;
06a4c1c5 2034 return 0;
2035}
2036
cb6bf355
YH		 2037static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2038{
2039 union fwnet_hwaddr *ha;
2040
2041 if (dev->addr_len != FWNET_ALEN)
2042 return -1;
2043
2044 ha = (union fwnet_hwaddr *)dev->dev_addr;
2045
2046 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2047 eui[0] ^= 2;
2048 return 0;
2049}
2050
073a8e0e
YH		 2051static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2052{
2053 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2054 if (dev->addr_len != ARCNET_ALEN)
2055 return -1;
2056 memset(eui, 0, 7);
8e5e8f30 2057 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 2058 return 0;
2059}
2060
2061static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2062{
2063 if (dev->addr_len != INFINIBAND_ALEN)
2064 return -1;
2065 memcpy(eui, dev->dev_addr + 12, 8);
2066 eui[0] |= 2;
2067 return 0;
2068}
2069
c61393ea 2070static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2071{
9af28511
SH		 2072 if (addr == 0)
2073 return -1;
dfd982ba
YH		 2074 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2075 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2076 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2077 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2078 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2079 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2080 eui[1] = 0;
2081 eui[2] = 0x5E;
2082 eui[3] = 0xFE;
2083 memcpy(eui + 4, &addr, 4);
2084 return 0;
2085}
dfd982ba
YH		 2086
2087static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2088{
2089 if (dev->priv_flags & IFF_ISATAP)
2090 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2091 return -1;
2092}
2093
aee80b54 2094static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2095{
2096 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2097}
2098
e837735e
ND		 2099static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2100{
2101 memcpy(eui, dev->perm_addr, 3);
2102 memcpy(eui + 5, dev->perm_addr + 3, 3);
2103 eui[3] = 0xFF;
2104 eui[4] = 0xFE;
2105 eui[0] ^= 2;
2106 return 0;
2107}
2108
1da177e4
LT		 2109static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2110{
2111 switch (dev->type) {
2112 case ARPHRD_ETHER:
2113 case ARPHRD_FDDI:
073a8e0e 2114 return addrconf_ifid_eui48(eui, dev);
1da177e4 2115 case ARPHRD_ARCNET:
073a8e0e 2116 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2117 case ARPHRD_INFINIBAND:
073a8e0e 2118 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2119 case ARPHRD_SIT:
dfd982ba 2120 return addrconf_ifid_sit(eui, dev);
aee80b54 2121 case ARPHRD_IPGRE:
2122 return addrconf_ifid_gre(eui, dev);
e74bccb8 2123 case ARPHRD_6LOWPAN:
06a4c1c5 2124 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 2125 case ARPHRD_IEEE1394:
2126 return addrconf_ifid_ieee1394(eui, dev);
e837735e
ND		 2127 case ARPHRD_TUNNEL6:
2128 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2129 }
2130 return -1;
2131}
2132
2133static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2134{
2135 int err = -1;
2136 struct inet6_ifaddr *ifp;
2137
2138 read_lock_bh(&idev->lock);
602582ca
HFS		 2139 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2140 if (ifp->scope > IFA_LINK)
2141 break;
1da177e4
LT		 2142 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2143 memcpy(eui, ifp->addr.s6_addr+8, 8);
2144 err = 0;
2145 break;
2146 }
2147 }
2148 read_unlock_bh(&idev->lock);
2149 return err;
2150}
2151
1da177e4 2152/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 2153static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2154{
1da177e4 2155regen:
955189ef 2156 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2157 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2158
2159 /*
2160 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2161 * check if generated address is not inappropriate
2162 *
2163 * - Reserved subnet anycast (RFC 2526)
2164 * 11111101 11....11 1xxxxxxx
c7dc89c0 2165 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2166 * 00-00-5E-FE-xx-xx-xx-xx
2167 * - value 0
2168 * - XXX: already assigned to an address on the device
2169 */
1ab1457c 2170 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2171 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2172 (idev->rndid[7]&0x80))
2173 goto regen;
2174 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2175 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2176 goto regen;
2177 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2178 goto regen;
2179 }
1da177e4
LT		 2180}
2181
2182static void ipv6_regen_rndid(unsigned long data)
2183{
2184 struct inet6_dev *idev = (struct inet6_dev *) data;
2185 unsigned long expires;
2186
8814c4b5 2187 rcu_read_lock_bh();
1da177e4
LT		 2188 write_lock_bh(&idev->lock);
2189
2190 if (idev->dead)
2191 goto out;
2192
eb7e0575 2193 __ipv6_regen_rndid(idev);
1ab1457c 2194
1da177e4 2195 expires = jiffies +
1ab1457c 2196 idev->cnf.temp_prefered_lft * HZ -
1f9248e5
JP		 2197 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2198 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
784e2710 2199 idev->cnf.max_desync_factor * HZ;
1da177e4 2200 if (time_before(expires, jiffies)) {
f3213831
JP		 2201 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2202 __func__, idev->dev->name);
1da177e4
LT		 2203 goto out;
2204 }
2205
2206 if (!mod_timer(&idev->regen_timer, expires))
2207 in6_dev_hold(idev);
2208
2209out:
2210 write_unlock_bh(&idev->lock);
8814c4b5 2211 rcu_read_unlock_bh();
1da177e4
LT		 2212 in6_dev_put(idev);
2213}
2214
eb7e0575 2215static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2216{
1da177e4 2217 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 2218 __ipv6_regen_rndid(idev);
1da177e4 2219}
1da177e4
LT		 2220
2221/*
2222 * Add prefix route.
2223 */
2224
2225static void
2226addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2227 unsigned long expires, u32 flags)
1da177e4 2228{
86872cb5 2229 struct fib6_config cfg = {
ca254490 2230 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
86872cb5
TG		 2231 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2232 .fc_ifindex = dev->ifindex,
2233 .fc_expires = expires,
2234 .fc_dst_len = plen,
2235 .fc_flags = RTF_UP | flags,
c346dca1 2236 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2237 .fc_protocol = RTPROT_KERNEL,
86872cb5 2238 };
1da177e4 2239
4e3fd7a0 2240 cfg.fc_dst = *pfx;
1da177e4
LT		 2241
2242 /* Prevent useless cloning on PtP SIT.
2243 This thing is done here expecting that the whole
2244 class of non-broadcast devices need not cloning.
2245 */
07a93626 2246#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2247 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2248 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2249#endif
1da177e4 2250
86872cb5 2251 ip6_route_add(&cfg);
1da177e4
LT		 2252}
2253
14ef37b6
AH		 2254
2255static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2256 int plen,
2257 const struct net_device *dev,
2258 u32 flags, u32 noflags)
2259{
2260 struct fib6_node *fn;
2261 struct rt6_info *rt = NULL;
2262 struct fib6_table *table;
ca254490 2263 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2264
ca254490 2265 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2266 if (!table)
14ef37b6
AH		 2267 return NULL;
2268
5744dd9b 2269 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2270 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2271 if (!fn)
2272 goto out;
1f56a01f
MKL		 2273
2274 noflags |= RTF_CACHE;
14ef37b6 2275 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2276 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2277 continue;
2278 if ((rt->rt6i_flags & flags) != flags)
2279 continue;
85da53bf 2280 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2281 continue;
2282 dst_hold(&rt->dst);
2283 break;
2284 }
2285out:
5744dd9b 2286 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2287 return rt;
2288}
2289
2290
1da177e4
LT		 2291/* Create "default" multicast route to the interface */
2292
2293static void addrconf_add_mroute(struct net_device *dev)
2294{
86872cb5 2295 struct fib6_config cfg = {
ca254490 2296 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2297 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2298 .fc_ifindex = dev->ifindex,
2299 .fc_dst_len = 8,
2300 .fc_flags = RTF_UP,
c346dca1 2301 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2302 };
2303
2304 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2305
2306 ip6_route_add(&cfg);
1da177e4
LT		 2307}
2308
1da177e4
LT		 2309static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2310{
2311 struct inet6_dev *idev;
2312
2313 ASSERT_RTNL();
2314
e21e8467
SH		 2315 idev = ipv6_find_idev(dev);
2316 if (!idev)
64e724f6
BH		 2317 return ERR_PTR(-ENOBUFS);
2318
2319 if (idev->cnf.disable_ipv6)
2320 return ERR_PTR(-EACCES);
1da177e4
LT		 2321
2322 /* Add default multicast route */
ba46ee4c 2323 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
4af04aba 2324 addrconf_add_mroute(dev);
1da177e4 2325
1da177e4
LT		 2326 return idev;
2327}
2328
53bd6749
JP		 2329static void manage_tempaddrs(struct inet6_dev *idev,
2330 struct inet6_ifaddr *ifp,
2331 __u32 valid_lft, __u32 prefered_lft,
2332 bool create, unsigned long now)
2333{
2334 u32 flags;
2335 struct inet6_ifaddr *ift;
2336
2337 read_lock_bh(&idev->lock);
2338 /* update all temporary addresses in the list */
2339 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2340 int age, max_valid, max_prefered;
2341
2342 if (ifp != ift->ifpub)
2343 continue;
2344
2345 /* RFC 4941 section 3.3:
2346 * If a received option will extend the lifetime of a public
2347 * address, the lifetimes of temporary addresses should
2348 * be extended, subject to the overall constraint that no
2349 * temporary addresses should ever remain "valid" or "preferred"
2350 * for a time longer than (TEMP_VALID_LIFETIME) or
2351 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2352 */
2353 age = (now - ift->cstamp) / HZ;
2354 max_valid = idev->cnf.temp_valid_lft - age;
2355 if (max_valid < 0)
2356 max_valid = 0;
2357
2358 max_prefered = idev->cnf.temp_prefered_lft -
2359 idev->cnf.max_desync_factor - age;
2360 if (max_prefered < 0)
2361 max_prefered = 0;
2362
2363 if (valid_lft > max_valid)
2364 valid_lft = max_valid;
2365
2366 if (prefered_lft > max_prefered)
2367 prefered_lft = max_prefered;
2368
2369 spin_lock(&ift->lock);
2370 flags = ift->flags;
2371 ift->valid_lft = valid_lft;
2372 ift->prefered_lft = prefered_lft;
2373 ift->tstamp = now;
2374 if (prefered_lft > 0)
2375 ift->flags &= ~IFA_F_DEPRECATED;
2376
2377 spin_unlock(&ift->lock);
2378 if (!(flags&IFA_F_TENTATIVE))
2379 ipv6_ifa_notify(0, ift);
2380 }
2381
2382 if ((create || list_empty(&idev->tempaddr_list)) &&
2383 idev->cnf.use_tempaddr > 0) {
2384 /* When a new public address is created as described
2385 * in [ADDRCONF], also create a new temporary address.
2386 * Also create a temporary address if it's enabled but
2387 * no temporary address currently exists.
2388 */
2389 read_unlock_bh(&idev->lock);
2390 ipv6_create_tempaddr(ifp, NULL);
2391 } else {
2392 read_unlock_bh(&idev->lock);
2393 }
2394}
2395
cc9da6cc
BM		 2396static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2397{
2398 return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2399 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2400}
2401
cc84b3c6
AA		 2402int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2403 const struct prefix_info *pinfo,
2404 struct inet6_dev *in6_dev,
2405 const struct in6_addr *addr, int addr_type,
2406 u32 addr_flags, bool sllao, bool tokenized,
2407 __u32 valid_lft, u32 prefered_lft)
4f672235
AA		 2408{
2409 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2410 int create = 0, update_lft = 0;
2411
2412 if (!ifp && valid_lft) {
2413 int max_addresses = in6_dev->cnf.max_addresses;
2414
2415#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2416 if (in6_dev->cnf.optimistic_dad &&
2417 !net->ipv6.devconf_all->forwarding && sllao)
2418 addr_flags |= IFA_F_OPTIMISTIC;
2419#endif
2420
2421 /* Do not allow to create too much of autoconfigured
2422 * addresses; this would be too easy way to crash kernel.
2423 */
2424 if (!max_addresses ||
2425 ipv6_count_addresses(in6_dev) < max_addresses)
2426 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2427 pinfo->prefix_len,
2428 addr_type&IPV6_ADDR_SCOPE_MASK,
2429 addr_flags, valid_lft,
2430 prefered_lft);
2431
2432 if (IS_ERR_OR_NULL(ifp))
2433 return -1;
2434
2435 update_lft = 0;
2436 create = 1;
2437 spin_lock_bh(&ifp->lock);
2438 ifp->flags |= IFA_F_MANAGETEMPADDR;
2439 ifp->cstamp = jiffies;
2440 ifp->tokenized = tokenized;
2441 spin_unlock_bh(&ifp->lock);
2442 addrconf_dad_start(ifp);
2443 }
2444
2445 if (ifp) {
2446 u32 flags;
2447 unsigned long now;
2448 u32 stored_lft;
2449
2450 /* update lifetime (RFC2462 5.5.3 e) */
2451 spin_lock_bh(&ifp->lock);
2452 now = jiffies;
2453 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2454 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2455 else
2456 stored_lft = 0;
2457 if (!update_lft && !create && stored_lft) {
2458 const u32 minimum_lft = min_t(u32,
2459 stored_lft, MIN_VALID_LIFETIME);
2460 valid_lft = max(valid_lft, minimum_lft);
2461
2462 /* RFC4862 Section 5.5.3e:
2463 * "Note that the preferred lifetime of the
2464 * corresponding address is always reset to
2465 * the Preferred Lifetime in the received
2466 * Prefix Information option, regardless of
2467 * whether the valid lifetime is also reset or
2468 * ignored."
2469 *
2470 * So we should always update prefered_lft here.
2471 */
2472 update_lft = 1;
2473 }
2474
2475 if (update_lft) {
2476 ifp->valid_lft = valid_lft;
2477 ifp->prefered_lft = prefered_lft;
2478 ifp->tstamp = now;
2479 flags = ifp->flags;
2480 ifp->flags &= ~IFA_F_DEPRECATED;
2481 spin_unlock_bh(&ifp->lock);
2482
2483 if (!(flags&IFA_F_TENTATIVE))
2484 ipv6_ifa_notify(0, ifp);
2485 } else
2486 spin_unlock_bh(&ifp->lock);
2487
2488 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2489 create, now);
2490
2491 in6_ifa_put(ifp);
2492 addrconf_verify();
2493 }
2494
2495 return 0;
2496}
cc84b3c6 2497EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
4f672235 2498
e6bff995 2499void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2500{
2501 struct prefix_info *pinfo;
2502 __u32 valid_lft;
2503 __u32 prefered_lft;
4f672235 2504 int addr_type, err;
64236f3f 2505 u32 addr_flags = 0;
1da177e4 2506 struct inet6_dev *in6_dev;
56d417b1 2507 struct net *net = dev_net(dev);
1da177e4
LT		 2508
2509 pinfo = (struct prefix_info *) opt;
1ab1457c 2510
1da177e4 2511 if (len < sizeof(struct prefix_info)) {
ba3542e1 2512 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2513 return;
2514 }
1ab1457c 2515
1da177e4
LT		 2516 /*
2517 * Validation checks ([ADDRCONF], page 19)
2518 */
2519
2520 addr_type = ipv6_addr_type(&pinfo->prefix);
2521
2522 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2523 return;
2524
2525 valid_lft = ntohl(pinfo->valid);
2526 prefered_lft = ntohl(pinfo->prefered);
2527
2528 if (prefered_lft > valid_lft) {
e87cc472 2529 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2530 return;
2531 }
2532
2533 in6_dev = in6_dev_get(dev);
2534
63159f29 2535 if (!in6_dev) {
e87cc472
JP		 2536 net_dbg_ratelimited("addrconf: device %s not configured\n",
2537 dev->name);
1da177e4
LT		 2538 return;
2539 }
2540
2541 /*
2542 * Two things going on here:
2543 * 1) Add routes for on-link prefixes
2544 * 2) Configure prefixes with the auto flag set
2545 */
2546
4bed72e4
YH		 2547 if (pinfo->onlink) {
2548 struct rt6_info *rt;
2549 unsigned long rt_expires;
2550
6f704992
YH		 2551 /* Avoid arithmetic overflow. Really, we could
2552 * save rt_expires in seconds, likely valid_lft,
2553 * but it would require division in fib gc, that it
2554 * not good.
2555 */
4bed72e4
YH		 2556 if (HZ > USER_HZ)
2557 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2558 else
2559 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2560
4bed72e4
YH		 2561 if (addrconf_finite_timeout(rt_expires))
2562 rt_expires *= HZ;
1da177e4 2563
14ef37b6
AH		 2564 rt = addrconf_get_prefix_route(&pinfo->prefix,
2565 pinfo->prefix_len,
2566 dev,
2567 RTF_ADDRCONF | RTF_PREFIX_RT,
2568 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2569
14ef37b6 2570 if (rt) {
6f704992
YH		 2571 /* Autoconf prefix route */
2572 if (valid_lft == 0) {
2573 ip6_del_rt(rt);
2574 rt = NULL;
4bed72e4 2575 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2576 /* not infinity */
1716a961 2577 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2578 } else {
1716a961 2579 rt6_clean_expires(rt);
1da177e4
LT		 2580 }
2581 } else if (valid_lft) {
6f704992 2582 clock_t expires = 0;
4bed72e4
YH		 2583 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2584 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2585 /* not infinity */
2586 flags |= RTF_EXPIRES;
2587 expires = jiffies_to_clock_t(rt_expires);
2588 }
1da177e4 2589 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2590 dev, expires, flags);
1da177e4 2591 }
94e187c0 2592 ip6_rt_put(rt);
1da177e4
LT		 2593 }
2594
2595 /* Try to figure out our local address for this prefix */
2596
2597 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1da177e4 2598 struct in6_addr addr;
f997c55c 2599 bool tokenized = false, dev_addr_generated = false;
1da177e4
LT		 2600
2601 if (pinfo->prefix_len == 64) {
2602 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2603
2604 if (!ipv6_addr_any(&in6_dev->token)) {
2605 read_lock_bh(&in6_dev->lock);
2606 memcpy(addr.s6_addr + 8,
2607 in6_dev->token.s6_addr + 8, 8);
2608 read_unlock_bh(&in6_dev->lock);
617fe29d 2609 tokenized = true;
cc9da6cc 2610 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2611 !ipv6_generate_stable_address(&addr, 0,
2612 in6_dev)) {
64236f3f 2613 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2614 goto ok;
f53adae4
DB		 2615 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2616 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
4f672235 2617 goto put;
f997c55c
AA		 2618 } else {
2619 dev_addr_generated = true;
1da177e4
LT		 2620 }
2621 goto ok;
2622 }
e87cc472
JP		 2623 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2624 pinfo->prefix_len);
4f672235 2625 goto put;
1da177e4
LT		 2626
2627ok:
4f672235
AA		 2628 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2629 &addr, addr_type,
2630 addr_flags, sllao,
2631 tokenized, valid_lft,
2632 prefered_lft);
2633 if (err)
2634 goto put;
f997c55c
AA		 2635
2636 /* Ignore error case here because previous prefix add addr was
2637 * successful which will be notified.
2638 */
2639 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2640 addr_type, addr_flags, sllao,
2641 tokenized, valid_lft,
2642 prefered_lft,
2643 dev_addr_generated);
1da177e4
LT		 2644 }
2645 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
4f672235 2646put:
1da177e4
LT		 2647 in6_dev_put(in6_dev);
2648}
2649
2650/*
2651 * Set destination address.
2652 * Special case for SIT interfaces where we create a new "virtual"
2653 * device.
2654 */
af284937 2655int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2656{
2657 struct in6_ifreq ireq;
2658 struct net_device *dev;
2659 int err = -EINVAL;
2660
2661 rtnl_lock();
2662
2663 err = -EFAULT;
2664 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2665 goto err_exit;
2666
af284937 2667 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2668
2669 err = -ENODEV;
63159f29 2670 if (!dev)
1da177e4
LT		 2671 goto err_exit;
2672
07a93626 2673#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2674 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2675 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2676 struct ifreq ifr;
1da177e4
LT		 2677 struct ip_tunnel_parm p;
2678
2679 err = -EADDRNOTAVAIL;
2680 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2681 goto err_exit;
2682
2683 memset(&p, 0, sizeof(p));
2684 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2685 p.iph.saddr = 0;
2686 p.iph.version = 4;
2687 p.iph.ihl = 5;
2688 p.iph.protocol = IPPROTO_IPV6;
2689 p.iph.ttl = 64;
d20b3109 2690 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2691
5bc3eb7e
SH		 2692 if (ops->ndo_do_ioctl) {
2693 mm_segment_t oldfs = get_fs();
2694
2695 set_fs(KERNEL_DS);
2696 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2697 set_fs(oldfs);
2698 } else
2699 err = -EOPNOTSUPP;
1da177e4
LT		 2700
2701 if (err == 0) {
2702 err = -ENOBUFS;
af284937
DL		 2703 dev = __dev_get_by_name(net, p.name);
2704 if (!dev)
1da177e4
LT		 2705 goto err_exit;
2706 err = dev_open(dev);
2707 }
2708 }
0be669bb 2709#endif
1da177e4
LT		 2710
2711err_exit:
2712 rtnl_unlock();
2713 return err;
2714}
2715
93a714d6
MC		 2716static int ipv6_mc_config(struct sock *sk, bool join,
2717 const struct in6_addr *addr, int ifindex)
2718{
2719 int ret;
2720
2721 ASSERT_RTNL();
2722
2723 lock_sock(sk);
2724 if (join)
54ff9ef3 2725 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2726 else
54ff9ef3 2727 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2728 release_sock(sk);
2729
2730 return ret;
2731}
2732
1da177e4
LT		 2733/*
2734 * Manual configuration of address on an interface
2735 */
479840ff
JP		 2736static int inet6_addr_add(struct net *net, int ifindex,
2737 const struct in6_addr *pfx,
caeaba79 2738 const struct in6_addr *peer_pfx,
479840ff
JP		 2739 unsigned int plen, __u32 ifa_flags,
2740 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2741{
2742 struct inet6_ifaddr *ifp;
2743 struct inet6_dev *idev;
2744 struct net_device *dev;
93a714d6
MC		 2745 unsigned long timeout;
2746 clock_t expires;
1da177e4 2747 int scope;
6f704992 2748 u32 flags;
1da177e4
LT		 2749
2750 ASSERT_RTNL();
1ab1457c 2751
24ef0da7
TG		 2752 if (plen > 128)
2753 return -EINVAL;
2754
0778769d
NT		 2755 /* check the lifetime */
2756 if (!valid_lft || prefered_lft > valid_lft)
2757 return -EINVAL;
2758
53bd6749
JP		 2759 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2760 return -EINVAL;
2761
af284937
DL		 2762 dev = __dev_get_by_index(net, ifindex);
2763 if (!dev)
1da177e4 2764 return -ENODEV;
1ab1457c 2765
64e724f6
BH		 2766 idev = addrconf_add_dev(dev);
2767 if (IS_ERR(idev))
2768 return PTR_ERR(idev);
1da177e4 2769
93a714d6
MC		 2770 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2771 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2772 true, pfx, ifindex);
2773
2774 if (ret < 0)
2775 return ret;
2776 }
2777
1da177e4
LT		 2778 scope = ipv6_addr_scope(pfx);
2779
4bed72e4
YH		 2780 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2781 if (addrconf_finite_timeout(timeout)) {
2782 expires = jiffies_to_clock_t(timeout * HZ);
2783 valid_lft = timeout;
6f704992 2784 flags = RTF_EXPIRES;
4bed72e4
YH		 2785 } else {
2786 expires = 0;
2787 flags = 0;
2788 ifa_flags |= IFA_F_PERMANENT;
6f704992 2789 }
0778769d 2790
4bed72e4
YH		 2791 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2792 if (addrconf_finite_timeout(timeout)) {
2793 if (timeout == 0)
2794 ifa_flags |= IFA_F_DEPRECATED;
2795 prefered_lft = timeout;
2796 }
0778769d 2797
8a226b2c
JB		 2798 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2799 valid_lft, prefered_lft);
0778769d 2800
1da177e4 2801 if (!IS_ERR(ifp)) {
761aac73
TH		 2802 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2803 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2804 expires, flags);
2805 }
2806
95c385b4
NH		 2807 /*
2808 * Note that section 3.1 of RFC 4429 indicates
2809 * that the Optimistic flag should not be set for
2810 * manually configured addresses
2811 */
cf22f9a2 2812 addrconf_dad_start(ifp);
53bd6749
JP		 2813 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2814 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2815 true, jiffies);
1da177e4 2816 in6_ifa_put(ifp);
c15b1cca 2817 addrconf_verify_rtnl();
1da177e4 2818 return 0;
93a714d6
MC		 2819 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2820 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2821 false, pfx, ifindex);
1da177e4
LT		 2822 }
2823
2824 return PTR_ERR(ifp);
2825}
2826
6046d5b4
HK		 2827static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2828 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2829{
2830 struct inet6_ifaddr *ifp;
2831 struct inet6_dev *idev;
2832 struct net_device *dev;
1ab1457c 2833
24ef0da7
TG		 2834 if (plen > 128)
2835 return -EINVAL;
2836
af284937
DL		 2837 dev = __dev_get_by_index(net, ifindex);
2838 if (!dev)
1da177e4
LT		 2839 return -ENODEV;
2840
e5d08d71 2841 idev = __in6_dev_get(dev);
63159f29 2842 if (!idev)
1da177e4
LT		 2843 return -ENXIO;
2844
2845 read_lock_bh(&idev->lock);
502a2ffd 2846 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2847 if (ifp->prefix_len == plen &&
2848 ipv6_addr_equal(pfx, &ifp->addr)) {
2849 in6_ifa_hold(ifp);
2850 read_unlock_bh(&idev->lock);
1ab1457c 2851
6046d5b4
HK		 2852 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2853 (ifa_flags & IFA_F_MANAGETEMPADDR))
2854 manage_tempaddrs(idev, ifp, 0, 0, false,
2855 jiffies);
1da177e4 2856 ipv6_del_addr(ifp);
6046d5b4 2857 addrconf_verify_rtnl();
93a714d6
MC		 2858 if (ipv6_addr_is_multicast(pfx)) {
2859 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2860 false, pfx, dev->ifindex);
2861 }
1da177e4
LT		 2862 return 0;
2863 }
2864 }
2865 read_unlock_bh(&idev->lock);
2866 return -EADDRNOTAVAIL;
2867}
2868
2869
af284937 2870int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2871{
2872 struct in6_ifreq ireq;
2873 int err;
1ab1457c 2874
af31f412 2875 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2876 return -EPERM;
1ab1457c 2877
1da177e4
LT		 2878 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2879 return -EFAULT;
2880
2881 rtnl_lock();
caeaba79 2882 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2883 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2884 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2885 rtnl_unlock();
2886 return err;
2887}
2888
af284937 2889int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2890{
2891 struct in6_ifreq ireq;
2892 int err;
1ab1457c 2893
af31f412 2894 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2895 return -EPERM;
2896
2897 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2898 return -EFAULT;
2899
2900 rtnl_lock();
6046d5b4 2901 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2902 ireq.ifr6_prefixlen);
1da177e4
LT		 2903 rtnl_unlock();
2904 return err;
2905}
2906
b5f348e5
IJ		 2907static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2908 int plen, int scope)
2909{
2910 struct inet6_ifaddr *ifp;
2911
8a226b2c 2912 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2913 scope, IFA_F_PERMANENT,
2914 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2915 if (!IS_ERR(ifp)) {
2916 spin_lock_bh(&ifp->lock);
2917 ifp->flags &= ~IFA_F_TENTATIVE;
2918 spin_unlock_bh(&ifp->lock);
2919 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2920 in6_ifa_put(ifp);
2921 }
2922}
2923
07a93626 2924#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2925static void sit_add_v4_addrs(struct inet6_dev *idev)
2926{
1da177e4
LT		 2927 struct in6_addr addr;
2928 struct net_device *dev;
c346dca1 2929 struct net *net = dev_net(idev->dev);
929c9cf3 2930 int scope, plen;
f0e2acfa 2931 u32 pflags = 0;
1da177e4
LT		 2932
2933 ASSERT_RTNL();
2934
2935 memset(&addr, 0, sizeof(struct in6_addr));
2936 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2937
2938 if (idev->dev->flags&IFF_POINTOPOINT) {
2939 addr.s6_addr32[0] = htonl(0xfe800000);
2940 scope = IFA_LINK;
929c9cf3 2941 plen = 64;
1da177e4
LT		 2942 } else {
2943 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2944 plen = 96;
f0e2acfa 2945 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2946 }
2947
2948 if (addr.s6_addr32[3]) {
929c9cf3 2949 add_addr(idev, &addr, plen, scope);
f0e2acfa 2950 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2951 return;
2952 }
2953
6fda7350 2954 for_each_netdev(net, dev) {
8e5e8f30 2955 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2956 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2957 struct in_ifaddr *ifa;
1da177e4
LT		 2958
2959 int flag = scope;
2960
2961 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2962
2963 addr.s6_addr32[3] = ifa->ifa_local;
2964
2965 if (ifa->ifa_scope == RT_SCOPE_LINK)
2966 continue;
2967 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2968 if (idev->dev->flags&IFF_POINTOPOINT)
2969 continue;
2970 flag |= IFA_HOST;
2971 }
1da177e4 2972
b5f348e5 2973 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2974 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2975 pflags);
1da177e4
LT		 2976 }
2977 }
1ab1457c 2978 }
1da177e4 2979}
0be669bb 2980#endif
1da177e4
LT		 2981
2982static void init_loopback(struct net_device *dev)
2983{
2984 struct inet6_dev *idev;
25fb6ca4
BK		 2985 struct net_device *sp_dev;
2986 struct inet6_ifaddr *sp_ifa;
2987 struct rt6_info *sp_rt;
1da177e4
LT		 2988
2989 /* ::1 */
2990
2991 ASSERT_RTNL();
2992
e5d08d71 2993 idev = ipv6_find_idev(dev);
63159f29 2994 if (!idev) {
91df42be 2995 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2996 return;
2997 }
2998
b5f348e5 2999 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 3000
3001 /* Add routes to other interface's IPv6 addresses */
3002 for_each_netdev(dev_net(dev), sp_dev) {
3003 if (!strcmp(sp_dev->name, dev->name))
3004 continue;
3005
3006 idev = __in6_dev_get(sp_dev);
3007 if (!idev)
3008 continue;
3009
3010 read_lock_bh(&idev->lock);
3011 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
3012
3013 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
3014 continue;
3015
33d99113
G		 3016 if (sp_ifa->rt) {
3017 /* This dst has been added to garbage list when
3018 * lo device down, release this obsolete dst and
3019 * reallocate a new router for ifa.
3020 */
3021 if (sp_ifa->rt->dst.obsolete > 0) {
3022 ip6_rt_put(sp_ifa->rt);
3023 sp_ifa->rt = NULL;
3024 } else {
3025 continue;
3026 }
3027 }
a881ae1f 3028
57ec0afe 3029 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 3030
3031 /* Failure cases are ignored */
534c8779
G		 3032 if (!IS_ERR(sp_rt)) {
3033 sp_ifa->rt = sp_rt;
25fb6ca4 3034 ip6_ins_rt(sp_rt);
534c8779 3035 }
25fb6ca4
BK		 3036 }
3037 read_unlock_bh(&idev->lock);
3038 }
1da177e4
LT		 3039}
3040
2ad3ed59
AA		 3041void addrconf_add_linklocal(struct inet6_dev *idev,
3042 const struct in6_addr *addr, u32 flags)
1da177e4 3043{
8e5e8f30 3044 struct inet6_ifaddr *ifp;
64236f3f 3045 u32 addr_flags = flags | IFA_F_PERMANENT;
95c385b4
NH		 3046
3047#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3048 if (idev->cnf.optimistic_dad &&
702beb87 3049 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 3050 addr_flags |= IFA_F_OPTIMISTIC;
3051#endif
1da177e4 3052
07edd741
HFS		 3053 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3054 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 3055 if (!IS_ERR(ifp)) {
46d48046 3056 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 3057 addrconf_dad_start(ifp);
1da177e4
LT		 3058 in6_ifa_put(ifp);
3059 }
3060}
2ad3ed59 3061EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
1da177e4 3062
622c81d5
HFS		 3063static bool ipv6_reserved_interfaceid(struct in6_addr address)
3064{
3065 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3066 return true;
3067
3068 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3069 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3070 return true;
3071
3072 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3073 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3074 return true;
3075
3076 return false;
3077}
3078
3079static int ipv6_generate_stable_address(struct in6_addr *address,
3080 u8 dad_count,
3081 const struct inet6_dev *idev)
3082{
622c81d5
HFS		 3083 static DEFINE_SPINLOCK(lock);
3084 static __u32 digest[SHA_DIGEST_WORDS];
3085 static __u32 workspace[SHA_WORKSPACE_WORDS];
3086
3087 static union {
3088 char __data[SHA_MESSAGE_BYTES];
3089 struct {
3090 struct in6_addr secret;
ff40217e 3091 __be32 prefix[2];
622c81d5
HFS		 3092 unsigned char hwaddr[MAX_ADDR_LEN];
3093 u8 dad_count;
3094 } __packed;
3095 } data;
3096
3097 struct in6_addr secret;
3098 struct in6_addr temp;
3099 struct net *net = dev_net(idev->dev);
3100
3101 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3102
3103 if (idev->cnf.stable_secret.initialized)
3104 secret = idev->cnf.stable_secret.secret;
3105 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3106 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3107 else
3108 return -1;
3109
3110retry:
3111 spin_lock_bh(&lock);
3112
3113 sha_init(digest);
3114 memset(&data, 0, sizeof(data));
3115 memset(workspace, 0, sizeof(workspace));
3116 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3117 data.prefix[0] = address->s6_addr32[0];
3118 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3119 data.secret = secret;
3120 data.dad_count = dad_count;
3121
3122 sha_transform(digest, data.__data, workspace);
3123
3124 temp = *address;
ff40217e
HFS		 3125 temp.s6_addr32[2] = (__force __be32)digest[0];
3126 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3127
3128 spin_unlock_bh(&lock);
3129
3130 if (ipv6_reserved_interfaceid(temp)) {
3131 dad_count++;
1855b7c3 3132 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3133 return -1;
3134 goto retry;
3135 }
3136
3137 *address = temp;
3138 return 0;
3139}
3140
cc9da6cc
BM		 3141static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3142{
3143 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3144
3145 if (s->initialized)
3146 return;
3147 s = &idev->cnf.stable_secret;
3148 get_random_bytes(&s->secret, sizeof(s->secret));
3149 s->initialized = true;
3150}
3151
bc91b0f0
JP		 3152static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3153{
622c81d5
HFS		 3154 struct in6_addr addr;
3155
ca254490
DA		 3156 /* no link local addresses on L3 master devices */
3157 if (netif_is_l3_master(idev->dev))
3158 return;
3159
622c81d5 3160 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3161
cc9da6cc
BM		 3162 switch (idev->addr_gen_mode) {
3163 case IN6_ADDR_GEN_MODE_RANDOM:
3164 ipv6_gen_mode_random_init(idev);
3165 /* fallthrough */
3166 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3167 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3168 addrconf_add_linklocal(idev, &addr,
3169 IFA_F_STABLE_PRIVACY);
622c81d5
HFS		 3170 else if (prefix_route)
3171 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3172 break;
3173 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3174 /* addrconf_add_linklocal also adds a prefix_route and we
3175 * only need to care about prefix routes if ipv6_generate_eui64
3176 * couldn't generate one.
3177 */
3178 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3179 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0
JP		 3180 else if (prefix_route)
3181 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3182 break;
3183 case IN6_ADDR_GEN_MODE_NONE:
3184 default:
3185 /* will not add any link local address */
3186 break;
bc91b0f0
JP		 3187 }
3188}
3189
1da177e4
LT		 3190static void addrconf_dev_config(struct net_device *dev)
3191{
8e5e8f30 3192 struct inet6_dev *idev;
1da177e4
LT		 3193
3194 ASSERT_RTNL();
3195
74235a25
HX		 3196 if ((dev->type != ARPHRD_ETHER) &&
3197 (dev->type != ARPHRD_FDDI) &&
74235a25 3198 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3199 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3200 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3201 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc
BM		 3202 (dev->type != ARPHRD_6LOWPAN) &&
3203 (dev->type != ARPHRD_NONE)) {
74235a25
HX		 3204 /* Alas, we support only Ethernet autoconfiguration. */
3205 return;
3206 }
3207
1da177e4 3208 idev = addrconf_add_dev(dev);
64e724f6 3209 if (IS_ERR(idev))
1da177e4
LT		 3210 return;
3211
cc9da6cc
BM		 3212 /* this device type has no EUI support */
3213 if (dev->type == ARPHRD_NONE &&
3214 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3215 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3216
bc91b0f0 3217 addrconf_addr_gen(idev, false);
1da177e4
LT		 3218}
3219
07a93626 3220#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3221static void addrconf_sit_config(struct net_device *dev)
3222{
3223 struct inet6_dev *idev;
3224
3225 ASSERT_RTNL();
3226
1ab1457c
YH		 3227 /*
3228 * Configure the tunnel with one of our IPv4
3229 * addresses... we should configure all of
1da177e4
LT		 3230 * our v4 addrs in the tunnel
3231 */
3232
e5d08d71 3233 idev = ipv6_find_idev(dev);
63159f29 3234 if (!idev) {
91df42be 3235 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3236 return;
3237 }
3238
c7dc89c0 3239 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3240 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3241 return;
3242 }
3243
1da177e4
LT		 3244 sit_add_v4_addrs(idev);
3245
62b54dd9 3246 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3247 addrconf_add_mroute(dev);
1da177e4 3248}
0be669bb 3249#endif
1da177e4 3250
07a93626 3251#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3252static void addrconf_gre_config(struct net_device *dev)
3253{
3254 struct inet6_dev *idev;
aee80b54 3255
aee80b54 3256 ASSERT_RTNL();
3257
e5d08d71 3258 idev = ipv6_find_idev(dev);
63159f29 3259 if (!idev) {
91df42be 3260 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3261 return;
3262 }
3263
bc91b0f0 3264 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3265 if (dev->flags & IFF_POINTOPOINT)
3266 addrconf_add_mroute(dev);
aee80b54 3267}
3268#endif
3269
f1705ec1
DA		 3270static int fixup_permanent_addr(struct inet6_dev *idev,
3271 struct inet6_ifaddr *ifp)
3272{
3273 if (!ifp->rt) {
3274 struct rt6_info *rt;
3275
3276 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3277 if (unlikely(IS_ERR(rt)))
3278 return PTR_ERR(rt);
3279
3280 ifp->rt = rt;
3281 }
3282
3283 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3284 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3285 idev->dev, 0, 0);
3286 }
3287
3288 addrconf_dad_start(ifp);
3289
3290 return 0;
3291}
3292
3293static void addrconf_permanent_addr(struct net_device *dev)
3294{
3295 struct inet6_ifaddr *ifp, *tmp;
3296 struct inet6_dev *idev;
3297
3298 idev = __in6_dev_get(dev);
3299 if (!idev)
3300 return;
3301
3302 write_lock_bh(&idev->lock);
3303
3304 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3305 if ((ifp->flags & IFA_F_PERMANENT) &&
3306 fixup_permanent_addr(idev, ifp) < 0) {
3307 write_unlock_bh(&idev->lock);
3308 ipv6_del_addr(ifp);
3309 write_lock_bh(&idev->lock);
3310
3311 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3312 idev->dev->name, &ifp->addr);
3313 }
3314 }
3315
3316 write_unlock_bh(&idev->lock);
3317}
3318
1ab1457c 3319static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3320 void *ptr)
1da177e4 3321{
351638e7 3322 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4f7f34ea 3323 struct netdev_notifier_changeupper_info *info;
748e2d93 3324 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 3325 int run_pending = 0;
b217d616 3326 int err;
1da177e4 3327
e21e8467 3328 switch (event) {
45ba9dd2 3329 case NETDEV_REGISTER:
74235a25 3330 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3331 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3332 if (IS_ERR(idev))
3333 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3334 }
3335 break;
bcdd553f 3336
b7b0b1d2
AD		 3337 case NETDEV_CHANGEMTU:
3338 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3339 if (dev->mtu < IPV6_MIN_MTU) {
3340 addrconf_ifdown(dev, 1);
3341 break;
3342 }
3343
3344 if (idev) {
3345 rt6_mtu_change(dev, dev->mtu);
3346 idev->cnf.mtu6 = dev->mtu;
3347 break;
3348 }
3349
3350 /* allocate new idev */
3351 idev = ipv6_add_dev(dev);
3352 if (IS_ERR(idev))
3353 break;
3354
3355 /* device is still not ready */
3356 if (!(idev->if_flags & IF_READY))
3357 break;
3358
3359 run_pending = 1;
3360
3361 /* fall through */
3362
1da177e4 3363 case NETDEV_UP:
3c21edbd 3364 case NETDEV_CHANGE:
c2edacf8
JV		 3365 if (dev->flags & IFF_SLAVE)
3366 break;
3367
3ce62a84
WC		 3368 if (idev && idev->cnf.disable_ipv6)
3369 break;
3370
3c21edbd 3371 if (event == NETDEV_UP) {
38bd10c4
DA		 3372 /* restore routes for permanent addresses */
3373 addrconf_permanent_addr(dev);
3374
f24e3d65 3375 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 3376 /* device is not ready yet. */
f3213831 3377 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3378 dev->name);
3379 break;
3380 }
99081049 3381
d31c7b8f
EP		 3382 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3383 idev = ipv6_add_dev(dev);
3384
a317a2f1 3385 if (!IS_ERR_OR_NULL(idev)) {
99081049 3386 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3387 run_pending = 1;
3388 }
b7b0b1d2 3389 } else if (event == NETDEV_CHANGE) {
f24e3d65 3390 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 3391 /* device is still not ready. */
3392 break;
3393 }
3394
3395 if (idev) {
bcdd553f 3396 if (idev->if_flags & IF_READY)
3c21edbd
YH		 3397 /* device is already configured. */
3398 break;
3c21edbd
YH		 3399 idev->if_flags |= IF_READY;
3400 }
3401
f3213831
JP		 3402 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3403 dev->name);
3c21edbd 3404
c5e33bdd 3405 run_pending = 1;
3c21edbd
YH		 3406 }
3407
e21e8467 3408 switch (dev->type) {
07a93626 3409#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3410 case ARPHRD_SIT:
3411 addrconf_sit_config(dev);
3412 break;
aee80b54 3413#endif
07a93626 3414#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3415 case ARPHRD_IPGRE:
3416 addrconf_gre_config(dev);
3417 break;
0be669bb 3418#endif
1da177e4
LT		 3419 case ARPHRD_LOOPBACK:
3420 init_loopback(dev);
3421 break;
3422
3423 default:
3424 addrconf_dev_config(dev);
3425 break;
3ff50b79 3426 }
bcdd553f 3427
a317a2f1 3428 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3429 if (run_pending)
3430 addrconf_dad_run(idev);
3431
bcdd553f
SH		 3432 /*
3433 * If the MTU changed during the interface down,
3434 * when the interface up, the changed MTU must be
3435 * reflected in the idev as well as routers.
1da177e4 3436 */
bcdd553f
SH		 3437 if (idev->cnf.mtu6 != dev->mtu &&
3438 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3439 rt6_mtu_change(dev, dev->mtu);
3440 idev->cnf.mtu6 = dev->mtu;
3441 }
3442 idev->tstamp = jiffies;
3443 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3444
3445 /*
3446 * If the changed mtu during down is lower than
3447 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3448 */
3449 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 3450 addrconf_ifdown(dev, 1);
1da177e4
LT		 3451 }
3452 break;
3453
1da177e4
LT		 3454 case NETDEV_DOWN:
3455 case NETDEV_UNREGISTER:
3456 /*
3457 * Remove all addresses from this interface.
3458 */
3459 addrconf_ifdown(dev, event != NETDEV_DOWN);
3460 break;
3c21edbd 3461
1da177e4 3462 case NETDEV_CHANGENAME:
1da177e4 3463 if (idev) {
5632c515 3464 snmp6_unregister_dev(idev);
408c4768 3465 addrconf_sysctl_unregister(idev);
a317a2f1 3466 err = addrconf_sysctl_register(idev);
b217d616
HX		 3467 if (err)
3468 return notifier_from_errno(err);
a317a2f1
WC		 3469 err = snmp6_register_dev(idev);
3470 if (err) {
3471 addrconf_sysctl_unregister(idev);
3472 return notifier_from_errno(err);
3473 }
5632c515 3474 }
1da177e4 3475 break;
bcdd553f 3476
93d9b7d7
JP		 3477 case NETDEV_PRE_TYPE_CHANGE:
3478 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3479 if (idev)
3480 addrconf_type_change(dev, event);
75c78500 3481 break;
4f7f34ea
DA		 3482
3483 case NETDEV_CHANGEUPPER:
3484 info = ptr;
3485
3486 /* flush all routes if dev is linked to or unlinked from
3487 * an L3 master device (e.g., VRF)
3488 */
3489 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3490 addrconf_ifdown(dev, 0);
3ff50b79 3491 }
1da177e4
LT		 3492
3493 return NOTIFY_OK;
3494}
3495
3496/*
3497 * addrconf module should be notified of a device going up
3498 */
3499static struct notifier_block ipv6_dev_notf = {
3500 .notifier_call = addrconf_notify,
1da177e4
LT		 3501};
3502
93d9b7d7 3503static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3504{
3505 struct inet6_dev *idev;
3506 ASSERT_RTNL();
3507
3508 idev = __in6_dev_get(dev);
3509
93d9b7d7 3510 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3511 ipv6_mc_remap(idev);
93d9b7d7 3512 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3513 ipv6_mc_unmap(idev);
3514}
3515
70af921d
DA		 3516static bool addr_is_local(const struct in6_addr *addr)
3517{
3518 return ipv6_addr_type(addr) &
3519 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3520}
3521
1da177e4
LT		 3522static int addrconf_ifdown(struct net_device *dev, int how)
3523{
c346dca1 3524 struct net *net = dev_net(dev);
502a2ffd 3525 struct inet6_dev *idev;
f1705ec1
DA		 3526 struct inet6_ifaddr *ifa, *tmp;
3527 struct list_head del_list;
3528 int _keep_addr;
3529 bool keep_addr;
73a8bd74 3530 int state, i;
1da177e4
LT		 3531
3532 ASSERT_RTNL();
3533
73a8bd74
DM		 3534 rt6_ifdown(net, dev);
3535 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3536
3537 idev = __in6_dev_get(dev);
63159f29 3538 if (!idev)
1da177e4
LT		 3539 return -ENODEV;
3540
bcdd553f
SH		 3541 /*
3542 * Step 1: remove reference to ipv6 device from parent device.
3543 * Do not dev_put!
1da177e4 3544 */
439e2385 3545 if (how) {
1da177e4 3546 idev->dead = 1;
8814c4b5
YH		 3547
3548 /* protected by rtnl_lock */
a9b3cd7f 3549 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3550
3551 /* Step 1.5: remove snmp6 entry */
3552 snmp6_unregister_dev(idev);
3553
3554 }
3555
f1705ec1
DA		 3556 /* aggregate the system setting and interface setting */
3557 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3558 if (!_keep_addr)
3559 _keep_addr = idev->cnf.keep_addr_on_down;
3560
3561 /* combine the user config with event to determine if permanent
3562 * addresses are to be removed from address hash table
3563 */
bc561632 3564 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
f1705ec1 3565
73a8bd74
DM		 3566 /* Step 2: clear hash table */
3567 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3568 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3569
3570 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3571restart:
b67bfe0d 3572 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3573 if (ifa->idev == idev) {
c15b1cca 3574 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3575 /* combined flag + permanent flag decide if
3576 * address is retained on a down event
3577 */
3578 if (!keep_addr ||
70af921d
DA		 3579 !(ifa->flags & IFA_F_PERMANENT) ||
3580 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3581 hlist_del_init_rcu(&ifa->addr_lst);
3582 goto restart;
3583 }
73a8bd74
DM		 3584 }
3585 }
3586 spin_unlock_bh(&addrconf_hash_lock);
3587 }
3588
1da177e4
LT		 3589 write_lock_bh(&idev->lock);
3590
b7b1bfce
HFS		 3591 addrconf_del_rs_timer(idev);
3592
bcdd553f 3593 /* Step 2: clear flags for stateless addrconf */
439e2385 3594 if (!how)
3c21edbd 3595 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3596
439e2385 3597 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 3598 in6_dev_put(idev);
3599
bcdd553f 3600 /* Step 3: clear tempaddr list */
372e6c8f 3601 while (!list_empty(&idev->tempaddr_list)) {
3602 ifa = list_first_entry(&idev->tempaddr_list,
3603 struct inet6_ifaddr, tmp_list);
3604 list_del(&ifa->tmp_list);
1da177e4
LT		 3605 write_unlock_bh(&idev->lock);
3606 spin_lock_bh(&ifa->lock);
3607
3608 if (ifa->ifpub) {
3609 in6_ifa_put(ifa->ifpub);
3610 ifa->ifpub = NULL;
3611 }
3612 spin_unlock_bh(&ifa->lock);
3613 in6_ifa_put(ifa);
3614 write_lock_bh(&idev->lock);
3615 }
8f37ada5 3616
f1705ec1
DA		 3617 /* re-combine the user config with event to determine if permanent
3618 * addresses are to be removed from the interface list
3619 */
bc561632 3620 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
84e8b803 3621
f1705ec1
DA		 3622 INIT_LIST_HEAD(&del_list);
3623 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
38bd10c4
DA		 3624 struct rt6_info *rt = NULL;
3625
f1705ec1 3626 addrconf_del_dad_work(ifa);
84e8b803 3627
73a8bd74 3628 write_unlock_bh(&idev->lock);
8e8e676d 3629 spin_lock_bh(&ifa->lock);
f1705ec1 3630
70af921d
DA		 3631 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3632 !addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3633 /* set state to skip the notifier below */
3634 state = INET6_IFADDR_STATE_DEAD;
3635 ifa->state = 0;
3636 if (!(ifa->flags & IFA_F_NODAD))
3637 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3638
3639 rt = ifa->rt;
3640 ifa->rt = NULL;
f1705ec1
DA		 3641 } else {
3642 state = ifa->state;
3643 ifa->state = INET6_IFADDR_STATE_DEAD;
3644
c882219a 3645 list_move(&ifa->if_list, &del_list);
f1705ec1
DA		 3646 }
3647
8e8e676d 3648 spin_unlock_bh(&ifa->lock);
9d82ca98 3649
38bd10c4
DA		 3650 if (rt)
3651 ip6_del_rt(rt);
3652
73a8bd74
DM		 3653 if (state != INET6_IFADDR_STATE_DEAD) {
3654 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3655 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
ea06f717
MM		 3656 } else {
3657 if (idev->cnf.forwarding)
3658 addrconf_leave_anycast(ifa);
3659 addrconf_leave_solict(ifa->idev, &ifa->addr);
27bdb2ab 3660 }
8f37ada5 3661
73a8bd74
DM		 3662 write_lock_bh(&idev->lock);
3663 }
8f37ada5 3664
1da177e4
LT		 3665 write_unlock_bh(&idev->lock);
3666
f1705ec1
DA		 3667 /* now clean up addresses to be removed */
3668 while (!list_empty(&del_list)) {
3669 ifa = list_first_entry(&del_list,
3670 struct inet6_ifaddr, if_list);
3671 list_del(&ifa->if_list);
3672
3673 in6_ifa_put(ifa);
3674 }
3675
381f4dca
SD		 3676 /* Step 5: Discard anycast and multicast list */
3677 if (how) {
3678 ipv6_ac_destroy_dev(idev);
1da177e4 3679 ipv6_mc_destroy_dev(idev);
381f4dca 3680 } else {
1da177e4 3681 ipv6_mc_down(idev);
381f4dca 3682 }
1da177e4 3683
1da177e4 3684 idev->tstamp = jiffies;
1ab1457c 3685
bcdd553f 3686 /* Last: Shot the device (if unregistered) */
439e2385 3687 if (how) {
408c4768 3688 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3689 neigh_parms_release(&nd_tbl, idev->nd_parms);
3690 neigh_ifdown(&nd_tbl, dev);
3691 in6_dev_put(idev);
3692 }
3693 return 0;
3694}
3695
3696static void addrconf_rs_timer(unsigned long data)
3697{
b7b1bfce 3698 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3699 struct net_device *dev = idev->dev;
b7b1bfce 3700 struct in6_addr lladdr;
1da177e4 3701
b7b1bfce 3702 write_lock(&idev->lock);
5b2a1953 3703 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3704 goto out;
3705
9ba2add3 3706 if (!ipv6_accept_ra(idev))
5b2a1953 3707 goto out;
3708
3709 /* Announcement received after solicitation was sent */
3710 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3711 goto out;
1da177e4 3712
bd11f074 3713 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
caf92bc4
CW		 3714 write_unlock(&idev->lock);
3715 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3716 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3717 &in6addr_linklocal_allrouters);
3718 else
caf92bc4 3719 goto put;
1da177e4 3720
caf92bc4 3721 write_lock(&idev->lock);
bd11f074
MŻ		 3722 idev->rs_interval = rfc3315_s14_backoff_update(
3723 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
b7b1bfce
HFS		 3724 /* The wait after the last probe can be shorter */
3725 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3726 idev->cnf.rtr_solicits) ?
3727 idev->cnf.rtr_solicit_delay :
bd11f074 3728 idev->rs_interval);
1da177e4 3729 } else {
1da177e4
LT		 3730 /*
3731 * Note: we do not support deprecated "all on-link"
3732 * assumption any longer.
3733 */
91df42be 3734 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3735 }
3736
3737out:
b7b1bfce 3738 write_unlock(&idev->lock);
caf92bc4 3739put:
b7b1bfce 3740 in6_dev_put(idev);
1da177e4
LT		 3741}
3742
3743/*
3744 * Duplicate Address Detection
3745 */
3c21edbd
YH		 3746static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3747{
3748 unsigned long rand_num;
3749 struct inet6_dev *idev = ifp->idev;
3750
95c385b4
NH		 3751 if (ifp->flags & IFA_F_OPTIMISTIC)
3752 rand_num = 0;
3753 else
63862b5b 3754 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3755
b7b1bfce 3756 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3757 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3758}
3759
c15b1cca 3760static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3761{
3762 struct inet6_dev *idev = ifp->idev;
3763 struct net_device *dev = idev->dev;
16186a82 3764 bool notify = false;
1da177e4
LT		 3765
3766 addrconf_join_solict(dev, &ifp->addr);
3767
63862b5b 3768 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3769
3770 read_lock_bh(&idev->lock);
622ccdf1 3771 spin_lock(&ifp->lock);
e9d3e084 3772 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3773 goto out;
1da177e4
LT		 3774
3775 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3776 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3777 !(ifp->flags&IFA_F_TENTATIVE) ||
3778 ifp->flags & IFA_F_NODAD) {
cc411d0b 3779 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3780 spin_unlock(&ifp->lock);
1da177e4
LT		 3781 read_unlock_bh(&idev->lock);
3782
3783 addrconf_dad_completed(ifp);
3784 return;
3785 }
3786
6732bade 3787 if (!(idev->if_flags & IF_READY)) {
21809faf 3788 spin_unlock(&ifp->lock);
6732bade 3789 read_unlock_bh(&idev->lock);
3c21edbd 3790 /*
590a9887 3791 * If the device is not ready:
3c21edbd
YH		 3792 * - keep it tentative if it is a permanent address.
3793 * - otherwise, kill it.
3794 */
3795 in6_ifa_hold(ifp);
cc411d0b 3796 addrconf_dad_stop(ifp, 0);
6732bade 3797 return;
3c21edbd 3798 }
95c385b4
NH		 3799
3800 /*
3801 * Optimistic nodes can start receiving
3802 * Frames right away
3803 */
7fd2561e 3804 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3805 ip6_ins_rt(ifp->rt);
7fd2561e
EK		 3806 if (ipv6_use_optimistic_addr(idev)) {
3807 /* Because optimistic nodes can use this address,
3808 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3809 */
16186a82 3810 notify = true;
7fd2561e
EK		 3811 }
3812 }
95c385b4 3813
6732bade 3814 addrconf_dad_kick(ifp);
1da177e4 3815out:
622ccdf1 3816 spin_unlock(&ifp->lock);
1da177e4 3817 read_unlock_bh(&idev->lock);
16186a82 3818 if (notify)
3819 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 3820}
3821
c15b1cca 3822static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3823{
c15b1cca
HFS		 3824 bool begin_dad = false;
3825
8e8e676d 3826 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3827 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3828 ifp->state = INET6_IFADDR_STATE_PREDAD;
3829 begin_dad = true;
3830 }
8e8e676d 3831 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3832
3833 if (begin_dad)
3834 addrconf_mod_dad_work(ifp, 0);
3835}
3836
3837static void addrconf_dad_work(struct work_struct *w)
3838{
3839 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3840 struct inet6_ifaddr,
3841 dad_work);
1da177e4 3842 struct inet6_dev *idev = ifp->idev;
1da177e4 3843 struct in6_addr mcaddr;
85b51b12 3844 bool disable_ipv6 = false;
1da177e4 3845
c15b1cca
HFS		 3846 enum {
3847 DAD_PROCESS,
3848 DAD_BEGIN,
3849 DAD_ABORT,
3850 } action = DAD_PROCESS;
3851
3852 rtnl_lock();
3853
8e8e676d 3854 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3855 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3856 action = DAD_BEGIN;
3857 ifp->state = INET6_IFADDR_STATE_DAD;
3858 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3859 action = DAD_ABORT;
3860 ifp->state = INET6_IFADDR_STATE_POSTDAD;
85b51b12
MM		 3861
3862 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3863 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3864 struct in6_addr addr;
3865
3866 addr.s6_addr32[0] = htonl(0xfe800000);
3867 addr.s6_addr32[1] = 0;
3868
3869 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3870 ipv6_addr_equal(&ifp->addr, &addr)) {
3871 /* DAD failed for link-local based on MAC */
3872 idev->cnf.disable_ipv6 = 1;
3873
3874 pr_info("%s: IPv6 being disabled!\n",
3875 ifp->idev->dev->name);
3876 disable_ipv6 = true;
3877 }
3878 }
c15b1cca 3879 }
8e8e676d 3880 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3881
3882 if (action == DAD_BEGIN) {
3883 addrconf_dad_begin(ifp);
3884 goto out;
3885 } else if (action == DAD_ABORT) {
751eb6b6 3886 in6_ifa_hold(ifp);
c15b1cca 3887 addrconf_dad_stop(ifp, 1);
85b51b12
MM		 3888 if (disable_ipv6)
3889 addrconf_ifdown(idev->dev, 0);
c15b1cca
HFS		 3890 goto out;
3891 }
3892
b7b1bfce 3893 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3894 goto out;
3895
c15b1cca 3896 write_lock_bh(&idev->lock);
122e4519 3897 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3898 write_unlock_bh(&idev->lock);
1da177e4
LT		 3899 goto out;
3900 }
21809faf 3901
3902 spin_lock(&ifp->lock);
622ccdf1
HX		 3903 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3904 spin_unlock(&ifp->lock);
c15b1cca 3905 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3906 goto out;
3907 }
3908
b7b1bfce 3909 if (ifp->dad_probes == 0) {
1da177e4
LT		 3910 /*
3911 * DAD was successful
3912 */
3913
cc411d0b 3914 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3915 spin_unlock(&ifp->lock);
c15b1cca 3916 write_unlock_bh(&idev->lock);
1da177e4
LT		 3917
3918 addrconf_dad_completed(ifp);
3919
3920 goto out;
3921 }
3922
b7b1bfce 3923 ifp->dad_probes--;
c15b1cca
HFS		 3924 addrconf_mod_dad_work(ifp,
3925 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3926 spin_unlock(&ifp->lock);
c15b1cca 3927 write_unlock_bh(&idev->lock);
1da177e4
LT		 3928
3929 /* send a neighbour solicitation for our addr */
1da177e4 3930 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
304d888b 3931 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3932out:
3933 in6_ifa_put(ifp);
c15b1cca 3934 rtnl_unlock();
1da177e4
LT		 3935}
3936
11ffff75
HFS		 3937/* ifp->idev must be at least read locked */
3938static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3939{
3940 struct inet6_ifaddr *ifpiter;
3941 struct inet6_dev *idev = ifp->idev;
3942
602582ca
HFS		 3943 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3944 if (ifpiter->scope > IFA_LINK)
3945 break;
11ffff75
HFS		 3946 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3947 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3948 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3949 IFA_F_PERMANENT)
3950 return false;
3951 }
3952 return true;
3953}
3954
1da177e4
LT		 3955static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3956{
e21e8467 3957 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3958 struct in6_addr lladdr;
b173ee48 3959 bool send_rs, send_mld;
b7b1bfce 3960
c15b1cca 3961 addrconf_del_dad_work(ifp);
1da177e4
LT		 3962
3963 /*
3964 * Configure the address for reception. Now it is valid.
3965 */
3966
3967 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3968
026359bc
TA		 3969 /* If added prefix is link local and we are prepared to process
3970 router advertisements, start sending router solicitations.
1da177e4
LT		 3971 */
3972
1ec047eb 3973 read_lock_bh(&ifp->idev->lock);
11ffff75 3974 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 3975 send_rs = send_mld &&
3976 ipv6_accept_ra(ifp->idev) &&
bd11f074 3977 ifp->idev->cnf.rtr_solicits != 0 &&
b173ee48 3978 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 3979 read_unlock_bh(&ifp->idev->lock);
3980
b173ee48
HFS		 3981 /* While dad is in progress mld report's source address is in6_addrany.
3982 * Resend with proper ll now.
3983 */
3984 if (send_mld)
3985 ipv6_mc_dad_complete(ifp->idev);
3986
1ec047eb 3987 if (send_rs) {
1da177e4
LT		 3988 /*
3989 * If a host as already performed a random delay
3990 * [...] as part of DAD [...] there is no need
3991 * to delay again before sending the first RS
3992 */
1ec047eb 3993 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 3994 return;
1ec047eb 3995 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 3996
b7b1bfce
HFS		 3997 write_lock_bh(&ifp->idev->lock);
3998 spin_lock(&ifp->lock);
bd11f074
MŻ		 3999 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4000 ifp->idev->cnf.rtr_solicit_interval);
b7b1bfce 4001 ifp->idev->rs_probes = 1;
1da177e4 4002 ifp->idev->if_flags |= IF_RS_SENT;
bd11f074 4003 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
b7b1bfce
HFS		 4004 spin_unlock(&ifp->lock);
4005 write_unlock_bh(&ifp->idev->lock);
1da177e4
LT		 4006 }
4007}
4008
e21e8467
SH		 4009static void addrconf_dad_run(struct inet6_dev *idev)
4010{
c5e33bdd
YH		 4011 struct inet6_ifaddr *ifp;
4012
4013 read_lock_bh(&idev->lock);
502a2ffd 4014 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 4015 spin_lock(&ifp->lock);
f2344a13
HX		 4016 if (ifp->flags & IFA_F_TENTATIVE &&
4017 ifp->state == INET6_IFADDR_STATE_DAD)
4018 addrconf_dad_kick(ifp);
21809faf 4019 spin_unlock(&ifp->lock);
c5e33bdd
YH		 4020 }
4021 read_unlock_bh(&idev->lock);
4022}
4023
1da177e4
LT		 4024#ifdef CONFIG_PROC_FS
4025struct if6_iter_state {
3c40090a 4026 struct seq_net_private p;
1da177e4 4027 int bucket;
1d578303 4028 int offset;
1da177e4
LT		 4029};
4030
1d578303 4031static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 4032{
4033 struct inet6_ifaddr *ifa = NULL;
4034 struct if6_iter_state *state = seq->private;
1218854a 4035 struct net *net = seq_file_net(seq);
1d578303 4036 int p = 0;
1da177e4 4037
1d578303
MM		 4038 /* initial bucket if pos is 0 */
4039 if (pos == 0) {
4040 state->bucket = 0;
4041 state->offset = 0;
4042 }
4043
4044 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 4045 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 4046 addr_lst) {
9f0d3c27
ED		 4047 if (!net_eq(dev_net(ifa->idev->dev), net))
4048 continue;
1d578303
MM		 4049 /* sync with offset */
4050 if (p < state->offset) {
4051 p++;
4052 continue;
4053 }
4054 state->offset++;
9f0d3c27 4055 return ifa;
1d578303
MM		 4056 }
4057
4058 /* prepare for next bucket */
4059 state->offset = 0;
4060 p = 0;
1da177e4 4061 }
c2e21293 4062 return NULL;
1da177e4
LT		 4063}
4064
c2e21293 4065static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4066 struct inet6_ifaddr *ifa)
1da177e4
LT		 4067{
4068 struct if6_iter_state *state = seq->private;
1218854a 4069 struct net *net = seq_file_net(seq);
1da177e4 4070
b67bfe0d 4071 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 4072 if (!net_eq(dev_net(ifa->idev->dev), net))
4073 continue;
1d578303 4074 state->offset++;
9f0d3c27 4075 return ifa;
1d578303 4076 }
3c40090a 4077
c2e21293 4078 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 4079 state->offset = 0;
b67bfe0d 4080 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 4081 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 4082 if (!net_eq(dev_net(ifa->idev->dev), net))
4083 continue;
1d578303 4084 state->offset++;
9f0d3c27 4085 return ifa;
c2e21293 4086 }
1da177e4 4087 }
3c40090a 4088
c2e21293 4089 return NULL;
1da177e4
LT		 4090}
4091
1da177e4 4092static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 4093 __acquires(rcu_bh)
1da177e4 4094{
5c578aed 4095 rcu_read_lock_bh();
1d578303 4096 return if6_get_first(seq, *pos);
1da177e4
LT		 4097}
4098
4099static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4100{
4101 struct inet6_ifaddr *ifa;
4102
4103 ifa = if6_get_next(seq, v);
4104 ++*pos;
4105 return ifa;
4106}
4107
4108static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 4109 __releases(rcu_bh)
1da177e4 4110{
5c578aed 4111 rcu_read_unlock_bh();
1da177e4
LT		 4112}
4113
4114static int if6_seq_show(struct seq_file *seq, void *v)
4115{
4116 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4117 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4118 &ifp->addr,
1da177e4
LT		 4119 ifp->idev->dev->ifindex,
4120 ifp->prefix_len,
4121 ifp->scope,
971a351c 4122 (u8) ifp->flags,
1da177e4
LT		 4123 ifp->idev->dev->name);
4124 return 0;
4125}
4126
56b3d975 4127static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4128 .start = if6_seq_start,
4129 .next = if6_seq_next,
4130 .show = if6_seq_show,
4131 .stop = if6_seq_stop,
4132};
4133
4134static int if6_seq_open(struct inode *inode, struct file *file)
4135{
3c40090a
DL		 4136 return seq_open_net(inode, file, &if6_seq_ops,
4137 sizeof(struct if6_iter_state));
1da177e4
LT		 4138}
4139
9a32144e 4140static const struct file_operations if6_fops = {
1da177e4
LT		 4141 .owner = THIS_MODULE,
4142 .open = if6_seq_open,
4143 .read = seq_read,
4144 .llseek = seq_lseek,
3c40090a 4145 .release = seq_release_net,
1da177e4
LT		 4146};
4147
2c8c1e72 4148static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4149{
d4beaa66 4150 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 4151 return -ENOMEM;
4152 return 0;
4153}
4154
2c8c1e72 4155static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4156{
ece31ffd 4157 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4158}
4159
4160static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4161 .init = if6_proc_net_init,
4162 .exit = if6_proc_net_exit,
3c40090a
DL		 4163};
4164
4165int __init if6_proc_init(void)
4166{
4167 return register_pernet_subsys(&if6_proc_net_ops);
4168}
4169
1da177e4
LT		 4170void if6_proc_exit(void)
4171{
3c40090a 4172 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4173}
4174#endif /* CONFIG_PROC_FS */
4175
07a93626 4176#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4177/* Check if address is a home address configured on any interface. */
b71d1d42 4178int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 4179{
4180 int ret = 0;
c2e21293 4181 struct inet6_ifaddr *ifp = NULL;
ddbe5032 4182 unsigned int hash = inet6_addr_hash(addr);
c2e21293 4183
5c578aed 4184 rcu_read_lock_bh();
b67bfe0d 4185 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 4186 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 4187 continue;
caad295f 4188 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4189 (ifp->flags & IFA_F_HOMEADDRESS)) {
4190 ret = 1;
4191 break;
4192 }
4193 }
5c578aed 4194 rcu_read_unlock_bh();
3b9f9a1c
NT		 4195 return ret;
4196}
4197#endif
4198
1da177e4
LT		 4199/*
4200 * Periodic address status verification
4201 */
4202
c15b1cca 4203static void addrconf_verify_rtnl(void)
1da177e4 4204{
b2db7564 4205 unsigned long now, next, next_sec, next_sched;
1da177e4 4206 struct inet6_ifaddr *ifp;
1da177e4
LT		 4207 int i;
4208
c15b1cca
HFS		 4209 ASSERT_RTNL();
4210
5c578aed 4211 rcu_read_lock_bh();
1da177e4 4212 now = jiffies;
b2db7564 4213 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4214
c15b1cca 4215 cancel_delayed_work(&addr_chk_work);
1da177e4 4216
bcdd553f 4217 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4218restart:
c15b1cca 4219 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 4220 unsigned long age;
1da177e4 4221
fad8da3e
YA		 4222 /* When setting preferred_lft to a value not zero or
4223 * infinity, while valid_lft is infinity
4224 * IFA_F_PERMANENT has a non-infinity life time.
4225 */
4226 if ((ifp->flags & IFA_F_PERMANENT) &&
4227 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4228 continue;
4229
4230 spin_lock(&ifp->lock);
b2db7564
YH		 4231 /* We try to batch several events at once. */
4232 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4233
8f27ebb9
YH		 4234 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4235 age >= ifp->valid_lft) {
1da177e4
LT		 4236 spin_unlock(&ifp->lock);
4237 in6_ifa_hold(ifp);
1da177e4
LT		 4238 ipv6_del_addr(ifp);
4239 goto restart;
8f27ebb9
YH		 4240 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4241 spin_unlock(&ifp->lock);
4242 continue;
1da177e4 4243 } else if (age >= ifp->prefered_lft) {
a1ed0526 4244 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4245 int deprecate = 0;
4246
4247 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4248 deprecate = 1;
4249 ifp->flags |= IFA_F_DEPRECATED;
4250 }
4251
fad8da3e
YA		 4252 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4253 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4254 next = ifp->tstamp + ifp->valid_lft * HZ;
4255
4256 spin_unlock(&ifp->lock);
4257
4258 if (deprecate) {
4259 in6_ifa_hold(ifp);
1da177e4
LT		 4260
4261 ipv6_ifa_notify(0, ifp);
4262 in6_ifa_put(ifp);
4263 goto restart;
4264 }
1da177e4
LT		 4265 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4266 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4267 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4268 ifp->idev->cnf.dad_transmits *
1f9248e5 4269 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 4270
1da177e4
LT		 4271 if (age >= ifp->prefered_lft - regen_advance) {
4272 struct inet6_ifaddr *ifpub = ifp->ifpub;
4273 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4274 next = ifp->tstamp + ifp->prefered_lft * HZ;
4275 if (!ifp->regen_count && ifpub) {
4276 ifp->regen_count++;
4277 in6_ifa_hold(ifp);
4278 in6_ifa_hold(ifpub);
4279 spin_unlock(&ifp->lock);
5c578aed 4280
291d809b
HY		 4281 spin_lock(&ifpub->lock);
4282 ifpub->regen_count = 0;
4283 spin_unlock(&ifpub->lock);
1da177e4
LT		 4284 ipv6_create_tempaddr(ifpub, ifp);
4285 in6_ifa_put(ifpub);
4286 in6_ifa_put(ifp);
4287 goto restart;
4288 }
4289 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4290 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4291 spin_unlock(&ifp->lock);
1da177e4
LT		 4292 } else {
4293 /* ifp->prefered_lft <= ifp->valid_lft */
4294 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4295 next = ifp->tstamp + ifp->prefered_lft * HZ;
4296 spin_unlock(&ifp->lock);
4297 }
4298 }
1da177e4
LT		 4299 }
4300
b2db7564
YH		 4301 next_sec = round_jiffies_up(next);
4302 next_sched = next;
4303
4304 /* If rounded timeout is accurate enough, accept it. */
4305 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4306 next_sched = next_sec;
4307
4308 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4309 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4310 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4311
ba3542e1 4312 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4313 now, next, next_sec, next_sched);
c15b1cca 4314 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4315 rcu_read_unlock_bh();
1da177e4
LT		 4316}
4317
c15b1cca
HFS		 4318static void addrconf_verify_work(struct work_struct *w)
4319{
4320 rtnl_lock();
4321 addrconf_verify_rtnl();
4322 rtnl_unlock();
4323}
4324
4325static void addrconf_verify(void)
4326{
4327 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4328}
4329
caeaba79
ND		 4330static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4331 struct in6_addr **peer_pfx)
461d8837
TG		 4332{
4333 struct in6_addr *pfx = NULL;
4334
caeaba79
ND		 4335 *peer_pfx = NULL;
4336
461d8837
TG		 4337 if (addr)
4338 pfx = nla_data(addr);
4339
4340 if (local) {
4341 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4342 *peer_pfx = pfx;
4343 pfx = nla_data(local);
461d8837
TG		 4344 }
4345
4346 return pfx;
4347}
4348
ef7c79ed 4349static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4350 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4351 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4352 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4353 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 4354};
4355
1da177e4 4356static int
661d2967 4357inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4358{
3b1e0a65 4359 struct net *net = sock_net(skb->sk);
b933f716
TG		 4360 struct ifaddrmsg *ifm;
4361 struct nlattr *tb[IFA_MAX+1];
caeaba79 4362 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4363 u32 ifa_flags;
b933f716 4364 int err;
1da177e4 4365
b933f716
TG		 4366 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4367 if (err < 0)
4368 return err;
4369
4370 ifm = nlmsg_data(nlh);
caeaba79 4371 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4372 if (!pfx)
1da177e4
LT		 4373 return -EINVAL;
4374
6046d5b4
HK		 4375 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4376
4377 /* We ignore other flags so far. */
4378 ifa_flags &= IFA_F_MANAGETEMPADDR;
4379
4380 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4381 ifm->ifa_prefixlen);
1da177e4
LT		 4382}
4383
479840ff 4384static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 4385 u32 prefered_lft, u32 valid_lft)
081bba5b 4386{
6f704992
YH		 4387 u32 flags;
4388 clock_t expires;
4bed72e4 4389 unsigned long timeout;
53bd6749 4390 bool was_managetempaddr;
5b84efec 4391 bool had_prefixroute;
46d48046 4392
c15b1cca
HFS		 4393 ASSERT_RTNL();
4394
081bba5b
NT		 4395 if (!valid_lft || (prefered_lft > valid_lft))
4396 return -EINVAL;
4397
53bd6749
JP		 4398 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4399 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4400 return -EINVAL;
4401
4bed72e4
YH		 4402 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4403 if (addrconf_finite_timeout(timeout)) {
4404 expires = jiffies_to_clock_t(timeout * HZ);
4405 valid_lft = timeout;
6f704992 4406 flags = RTF_EXPIRES;
4bed72e4
YH		 4407 } else {
4408 expires = 0;
4409 flags = 0;
4410 ifa_flags |= IFA_F_PERMANENT;
6f704992 4411 }
081bba5b 4412
4bed72e4
YH		 4413 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4414 if (addrconf_finite_timeout(timeout)) {
4415 if (timeout == 0)
4416 ifa_flags |= IFA_F_DEPRECATED;
4417 prefered_lft = timeout;
4418 }
081bba5b
NT		 4419
4420 spin_lock_bh(&ifp->lock);
53bd6749 4421 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4422 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4423 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4424 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4425 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4426 IFA_F_NOPREFIXROUTE);
53bd6749 4427 ifp->flags |= ifa_flags;
081bba5b
NT		 4428 ifp->tstamp = jiffies;
4429 ifp->valid_lft = valid_lft;
4430 ifp->prefered_lft = prefered_lft;
4431
4432 spin_unlock_bh(&ifp->lock);
4433 if (!(ifp->flags&IFA_F_TENTATIVE))
4434 ipv6_ifa_notify(0, ifp);
081bba5b 4435
761aac73
TH		 4436 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4437 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4438 expires, flags);
5b84efec
TH		 4439 } else if (had_prefixroute) {
4440 enum cleanup_prefix_rt_t action;
4441 unsigned long rt_expires;
4442
4443 write_lock_bh(&ifp->idev->lock);
4444 action = check_cleanup_prefix_route(ifp, &rt_expires);
4445 write_unlock_bh(&ifp->idev->lock);
4446
4447 if (action != CLEANUP_PREFIX_RT_NOP) {
4448 cleanup_prefix_route(ifp, rt_expires,
4449 action == CLEANUP_PREFIX_RT_DEL);
4450 }
761aac73 4451 }
53bd6749
JP		 4452
4453 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4454 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4455 valid_lft = prefered_lft = 0;
4456 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4457 !was_managetempaddr, jiffies);
4458 }
4459
c15b1cca 4460 addrconf_verify_rtnl();
081bba5b
NT		 4461
4462 return 0;
4463}
4464
1da177e4 4465static int
661d2967 4466inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4467{
3b1e0a65 4468 struct net *net = sock_net(skb->sk);
461d8837
TG		 4469 struct ifaddrmsg *ifm;
4470 struct nlattr *tb[IFA_MAX+1];
caeaba79 4471 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 4472 struct inet6_ifaddr *ifa;
4473 struct net_device *dev;
55ebaef1 4474 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 4475 u32 ifa_flags;
461d8837 4476 int err;
1da177e4 4477
461d8837
TG		 4478 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4479 if (err < 0)
4480 return err;
4481
4482 ifm = nlmsg_data(nlh);
caeaba79 4483 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4484 if (!pfx)
1da177e4
LT		 4485 return -EINVAL;
4486
461d8837 4487 if (tb[IFA_CACHEINFO]) {
0778769d 4488 struct ifa_cacheinfo *ci;
461d8837
TG		 4489
4490 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 4491 valid_lft = ci->ifa_valid;
461d8837
TG		 4492 preferred_lft = ci->ifa_prefered;
4493 } else {
4494 preferred_lft = INFINITY_LIFE_TIME;
4495 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 4496 }
4497
af284937 4498 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4499 if (!dev)
7198f8ce
TG		 4500 return -ENODEV;
4501
479840ff
JP		 4502 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4503
55ebaef1 4504 /* We ignore other flags so far. */
761aac73 4505 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
93a714d6 4506 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
55ebaef1 4507
1cab3da6 4508 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
63159f29 4509 if (!ifa) {
7198f8ce
TG		 4510 /*
4511 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4512 * userspace already relies on not having to provide this.
7198f8ce 4513 */
caeaba79 4514 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 4515 ifm->ifa_prefixlen, ifa_flags,
4516 preferred_lft, valid_lft);
081bba5b
NT		 4517 }
4518
7198f8ce
TG		 4519 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4520 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4521 err = -EEXIST;
4522 else
55ebaef1 4523 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 4524
4525 in6_ifa_put(ifa);
4526
4527 return err;
1da177e4
LT		 4528}
4529
479840ff 4530static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4531 u8 scope, int ifindex)
4532{
4533 struct ifaddrmsg *ifm;
4534
4535 ifm = nlmsg_data(nlh);
4536 ifm->ifa_family = AF_INET6;
4537 ifm->ifa_prefixlen = prefixlen;
4538 ifm->ifa_flags = flags;
4539 ifm->ifa_scope = scope;
4540 ifm->ifa_index = ifindex;
4541}
4542
85486af0
TG		 4543static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4544 unsigned long tstamp, u32 preferred, u32 valid)
4545{
4546 struct ifa_cacheinfo ci;
4547
18a31e1e
TG		 4548 ci.cstamp = cstamp_delta(cstamp);
4549 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4550 ci.ifa_prefered = preferred;
4551 ci.ifa_valid = valid;
4552
4553 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4554}
4555
101bb229
TG		 4556static inline int rt_scope(int ifa_scope)
4557{
4558 if (ifa_scope & IFA_HOST)
4559 return RT_SCOPE_HOST;
4560 else if (ifa_scope & IFA_LINK)
4561 return RT_SCOPE_LINK;
4562 else if (ifa_scope & IFA_SITE)
4563 return RT_SCOPE_SITE;
4564 else
4565 return RT_SCOPE_UNIVERSE;
4566}
4567
0ab6803b
TG		 4568static inline int inet6_ifaddr_msgsize(void)
4569{
339bf98f 4570 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4571 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4572 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4573 + nla_total_size(sizeof(struct ifa_cacheinfo))
4574 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4575}
c5396a31 4576
1da177e4 4577static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4578 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4579{
1da177e4 4580 struct nlmsghdr *nlh;
85486af0 4581 u32 preferred, valid;
1da177e4 4582
15e47304 4583 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4584 if (!nlh)
26932566 4585 return -EMSGSIZE;
0ab6803b 4586
101bb229
TG		 4587 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4588 ifa->idev->dev->ifindex);
4589
fad8da3e
YA		 4590 if (!((ifa->flags&IFA_F_PERMANENT) &&
4591 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4592 preferred = ifa->prefered_lft;
4593 valid = ifa->valid_lft;
4594 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4595 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4596 if (preferred > tval)
4597 preferred -= tval;
4598 else
4599 preferred = 0;
f56619fc
BH		 4600 if (valid != INFINITY_LIFE_TIME) {
4601 if (valid > tval)
4602 valid -= tval;
4603 else
4604 valid = 0;
4605 }
1da177e4
LT		 4606 }
4607 } else {
85486af0
TG		 4608 preferred = INFINITY_LIFE_TIME;
4609 valid = INFINITY_LIFE_TIME;
4610 }
4611
7996c799 4612 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4613 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4614 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4615 goto error;
4616 } else
930345ea 4617 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4618 goto error;
4619
4620 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4621 goto error;
1da177e4 4622
479840ff
JP		 4623 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4624 goto error;
4625
053c095a
JB		 4626 nlmsg_end(skb, nlh);
4627 return 0;
caeaba79
ND		 4628
4629error:
4630 nlmsg_cancel(skb, nlh);
4631 return -EMSGSIZE;
1da177e4
LT		 4632}
4633
4634static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4635 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4636{
1da177e4 4637 struct nlmsghdr *nlh;
101bb229
TG		 4638 u8 scope = RT_SCOPE_UNIVERSE;
4639 int ifindex = ifmca->idev->dev->ifindex;
4640
4641 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4642 scope = RT_SCOPE_SITE;
1da177e4 4643
15e47304 4644 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4645 if (!nlh)
26932566 4646 return -EMSGSIZE;
85486af0 4647
0ab6803b 4648 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4649 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4650 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4651 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4652 nlmsg_cancel(skb, nlh);
4653 return -EMSGSIZE;
4654 }
85486af0 4655
053c095a
JB		 4656 nlmsg_end(skb, nlh);
4657 return 0;
1da177e4
LT		 4658}
4659
4660static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4661 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4662{
1da177e4 4663 struct nlmsghdr *nlh;
101bb229
TG		 4664 u8 scope = RT_SCOPE_UNIVERSE;
4665 int ifindex = ifaca->aca_idev->dev->ifindex;
4666
4667 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4668 scope = RT_SCOPE_SITE;
1da177e4 4669
15e47304 4670 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4671 if (!nlh)
26932566 4672 return -EMSGSIZE;
85486af0 4673
0ab6803b 4674 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4675 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4676 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4677 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4678 nlmsg_cancel(skb, nlh);
4679 return -EMSGSIZE;
4680 }
1da177e4 4681
053c095a
JB		 4682 nlmsg_end(skb, nlh);
4683 return 0;
1da177e4
LT		 4684}
4685
e21e8467 4686enum addr_type_t {
1da177e4
LT		 4687 UNICAST_ADDR,
4688 MULTICAST_ADDR,
4689 ANYCAST_ADDR,
4690};
4691
234b27c3
ED		 4692/* called with rcu_read_lock() */
4693static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4694 struct netlink_callback *cb, enum addr_type_t type,
4695 int s_ip_idx, int *p_ip_idx)
4696{
234b27c3
ED		 4697 struct ifmcaddr6 *ifmca;
4698 struct ifacaddr6 *ifaca;
4699 int err = 1;
4700 int ip_idx = *p_ip_idx;
4701
4702 read_lock_bh(&idev->lock);
4703 switch (type) {
502a2ffd 4704 case UNICAST_ADDR: {
4705 struct inet6_ifaddr *ifa;
4706
234b27c3 4707 /* unicast address incl. temp addr */
502a2ffd 4708 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4709 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4710 continue;
4711 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4712 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4713 cb->nlh->nlmsg_seq,
4714 RTM_NEWADDR,
4715 NLM_F_MULTI);
053c095a 4716 if (err < 0)
234b27c3 4717 break;
63998ac2 4718 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4719 }
4720 break;
502a2ffd 4721 }
234b27c3
ED		 4722 case MULTICAST_ADDR:
4723 /* multicast address */
4724 for (ifmca = idev->mc_list; ifmca;
4725 ifmca = ifmca->next, ip_idx++) {
4726 if (ip_idx < s_ip_idx)
4727 continue;
4728 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4729 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4730 cb->nlh->nlmsg_seq,
4731 RTM_GETMULTICAST,
4732 NLM_F_MULTI);
053c095a 4733 if (err < 0)
234b27c3
ED		 4734 break;
4735 }
4736 break;
4737 case ANYCAST_ADDR:
4738 /* anycast address */
4739 for (ifaca = idev->ac_list; ifaca;
4740 ifaca = ifaca->aca_next, ip_idx++) {
4741 if (ip_idx < s_ip_idx)
4742 continue;
4743 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4744 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4745 cb->nlh->nlmsg_seq,
4746 RTM_GETANYCAST,
4747 NLM_F_MULTI);
053c095a 4748 if (err < 0)
234b27c3
ED		 4749 break;
4750 }
4751 break;
4752 default:
4753 break;
4754 }
4755 read_unlock_bh(&idev->lock);
4756 *p_ip_idx = ip_idx;
4757 return err;
4758}
4759
1da177e4
LT		 4760static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4761 enum addr_type_t type)
4762{
234b27c3
ED		 4763 struct net *net = sock_net(skb->sk);
4764 int h, s_h;
1da177e4
LT		 4765 int idx, ip_idx;
4766 int s_idx, s_ip_idx;
1da177e4 4767 struct net_device *dev;
234b27c3
ED		 4768 struct inet6_dev *idev;
4769 struct hlist_head *head;
1ab1457c 4770
234b27c3
ED		 4771 s_h = cb->args[0];
4772 s_idx = idx = cb->args[1];
4773 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4774
234b27c3 4775 rcu_read_lock();
63998ac2 4776 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4777 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4778 idx = 0;
4779 head = &net->dev_index_head[h];
b67bfe0d 4780 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4781 if (idx < s_idx)
4782 goto cont;
4b97efdf 4783 if (h > s_h || idx > s_idx)
234b27c3
ED		 4784 s_ip_idx = 0;
4785 ip_idx = 0;
e21e8467
SH		 4786 idev = __in6_dev_get(dev);
4787 if (!idev)
234b27c3
ED		 4788 goto cont;
4789
4790 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4791 s_ip_idx, &ip_idx) < 0)
234b27c3 4792 goto done;
7562f876 4793cont:
234b27c3
ED		 4794 idx++;
4795 }
1da177e4 4796 }
234b27c3
ED		 4797done:
4798 rcu_read_unlock();
4799 cb->args[0] = h;
4800 cb->args[1] = idx;
4801 cb->args[2] = ip_idx;
4802
1da177e4
LT		 4803 return skb->len;
4804}
4805
4806static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4807{
4808 enum addr_type_t type = UNICAST_ADDR;
b854272b 4809
1da177e4
LT		 4810 return inet6_dump_addr(skb, cb, type);
4811}
4812
4813static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4814{
4815 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4816
1da177e4
LT		 4817 return inet6_dump_addr(skb, cb, type);
4818}
4819
4820
4821static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4822{
4823 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4824
1da177e4
LT		 4825 return inet6_dump_addr(skb, cb, type);
4826}
4827
661d2967 4828static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4829{
3b1e0a65 4830 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4831 struct ifaddrmsg *ifm;
4832 struct nlattr *tb[IFA_MAX+1];
caeaba79 4833 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4834 struct net_device *dev = NULL;
4835 struct inet6_ifaddr *ifa;
4836 struct sk_buff *skb;
6c223828
NT		 4837 int err;
4838
1b29fc2c
TG		 4839 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4840 if (err < 0)
4841 goto errout;
4842
caeaba79 4843 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
63159f29 4844 if (!addr) {
1b29fc2c
TG		 4845 err = -EINVAL;
4846 goto errout;
6c223828 4847 }
6c223828 4848
1b29fc2c 4849 ifm = nlmsg_data(nlh);
6c223828 4850 if (ifm->ifa_index)
6fda7350 4851 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4852
e21e8467
SH		 4853 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4854 if (!ifa) {
1b29fc2c
TG		 4855 err = -EADDRNOTAVAIL;
4856 goto errout;
4857 }
6c223828 4858
e21e8467
SH		 4859 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4860 if (!skb) {
6c223828 4861 err = -ENOBUFS;
1b29fc2c 4862 goto errout_ifa;
6c223828
NT		 4863 }
4864
15e47304 4865 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4866 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4867 if (err < 0) {
4868 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4869 WARN_ON(err == -EMSGSIZE);
4870 kfree_skb(skb);
4871 goto errout_ifa;
4872 }
15e47304 4873 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4874errout_ifa:
6c223828 4875 in6_ifa_put(ifa);
1b29fc2c 4876errout:
6c223828 4877 return err;
6c223828
NT		 4878}
4879
1da177e4
LT		 4880static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4881{
4882 struct sk_buff *skb;
c346dca1 4883 struct net *net = dev_net(ifa->idev->dev);
5d620266 4884 int err = -ENOBUFS;
1da177e4 4885
0ab6803b 4886 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 4887 if (!skb)
5d620266
TG		 4888 goto errout;
4889
4890 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4891 if (err < 0) {
4892 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4893 WARN_ON(err == -EMSGSIZE);
4894 kfree_skb(skb);
4895 goto errout;
4896 }
1ce85fe4
PNA		 4897 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4898 return;
5d620266
TG		 4899errout:
4900 if (err < 0)
6fda7350 4901 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4902}
4903
b6f99a21 4904static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4905 __s32 *array, int bytes)
4906{
04561c1f
TG		 4907 BUG_ON(bytes < (DEVCONF_MAX * 4));
4908
1da177e4
LT		 4909 memset(array, 0, bytes);
4910 array[DEVCONF_FORWARDING] = cnf->forwarding;
4911 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4912 array[DEVCONF_MTU6] = cnf->mtu6;
4913 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4914 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4915 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4916 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4917 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4918 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4919 jiffies_to_msecs(cnf->rtr_solicit_interval);
bd11f074
MŻ		 4920 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
4921 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
93908d19
TG		 4922 array[DEVCONF_RTR_SOLICIT_DELAY] =
4923 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4924 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4925 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4926 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4927 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4928 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4929 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4930 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4931 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4932 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4933 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4934 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4935 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 4936 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 4937 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4938#ifdef CONFIG_IPV6_ROUTER_PREF
4939 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4940 array[DEVCONF_RTR_PROBE_INTERVAL] =
4941 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4942#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4943 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4944#endif
930d6ff2 4945#endif
fbea49e1 4946 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4947 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4948#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4949 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 4950 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 4951#endif
7bc570c8
YH		 4952#ifdef CONFIG_IPV6_MROUTE
4953 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4954#endif
778d80be 4955 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4956 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4957 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 4958 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 4959 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 4960 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 4961 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 4962 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 4963 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 4964 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 4965 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 4966 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 4967 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1da177e4
LT		 4968}
4969
b382b191
TG		 4970static inline size_t inet6_ifla6_size(void)
4971{
4972 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4973 + nla_total_size(sizeof(struct ifla_cacheinfo))
4974 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4975 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 4976 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4977 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 4978}
4979
339bf98f
TG		 4980static inline size_t inet6_if_nlmsg_size(void)
4981{
4982 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4983 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4984 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4985 + nla_total_size(4) /* IFLA_MTU */
4986 + nla_total_size(4) /* IFLA_LINK */
0344338b 4987 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 4988 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 4989}
c5396a31 4990
be281e55 4991static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
aca05671 4992 int bytes)
7f7d9a6b
HX		 4993{
4994 int i;
aca05671 4995 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
7f7d9a6b
HX		 4996 BUG_ON(pad < 0);
4997
4998 /* Use put_unaligned() because stats may not be aligned for u64. */
aca05671
JH		 4999 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5000 for (i = 1; i < ICMP6_MIB_MAX; i++)
be281e55 5001 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b 5002
aca05671 5003 memset(&stats[ICMP6_MIB_MAX], 0, pad);
7f7d9a6b
HX		 5004}
5005
698365fa 5006static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 5007 int bytes, size_t syncpoff)
4ce3c183 5008{
a3a77372
R		 5009 int i, c;
5010 u64 buff[IPSTATS_MIB_MAX];
5011 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5012
4ce3c183
ED		 5013 BUG_ON(pad < 0);
5014
a3a77372
R		 5015 memset(buff, 0, sizeof(buff));
5016 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 5017
a3a77372
R		 5018 for_each_possible_cpu(c) {
5019 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5020 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5021 }
5022
5023 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5024 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 5025}
5026
7f7d9a6b
HX		 5027static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5028 int bytes)
5029{
e21e8467 5030 switch (attrtype) {
7f7d9a6b 5031 case IFLA_INET6_STATS:
a3a77372
R		 5032 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5033 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 5034 break;
5035 case IFLA_INET6_ICMP6STATS:
aca05671 5036 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
7f7d9a6b
HX		 5037 break;
5038 }
5039}
5040
d5566fd7
SV		 5041static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5042 u32 ext_filter_mask)
b382b191
TG		 5043{
5044 struct nlattr *nla;
5045 struct ifla_cacheinfo ci;
5046
c78679e8
DM		 5047 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5048 goto nla_put_failure;
b382b191 5049 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 5050 ci.tstamp = cstamp_delta(idev->tstamp);
5051 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 5052 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 5053 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5054 goto nla_put_failure;
b382b191 5055 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 5056 if (!nla)
b382b191
TG		 5057 goto nla_put_failure;
5058 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5059
5060 /* XXX - MC not implemented */
5061
d5566fd7
SV		 5062 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5063 return 0;
5064
b382b191 5065 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 5066 if (!nla)
b382b191
TG		 5067 goto nla_put_failure;
5068 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5069
5070 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 5071 if (!nla)
b382b191
TG		 5072 goto nla_put_failure;
5073 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5074
f53adae4 5075 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 5076 if (!nla)
f53adae4 5077 goto nla_put_failure;
bc91b0f0
JP		 5078
5079 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
5080 goto nla_put_failure;
5081
f53adae4
DB		 5082 read_lock_bh(&idev->lock);
5083 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5084 read_unlock_bh(&idev->lock);
5085
b382b191
TG		 5086 return 0;
5087
5088nla_put_failure:
5089 return -EMSGSIZE;
5090}
5091
b1974ed0
AR		 5092static size_t inet6_get_link_af_size(const struct net_device *dev,
5093 u32 ext_filter_mask)
b382b191
TG		 5094{
5095 if (!__in6_dev_get(dev))
5096 return 0;
5097
5098 return inet6_ifla6_size();
5099}
5100
d5566fd7
SV		 5101static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5102 u32 ext_filter_mask)
b382b191
TG		 5103{
5104 struct inet6_dev *idev = __in6_dev_get(dev);
5105
5106 if (!idev)
5107 return -ENODATA;
5108
d5566fd7 5109 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5110 return -EMSGSIZE;
5111
5112 return 0;
5113}
5114
f53adae4
DB		 5115static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5116{
f53adae4
DB		 5117 struct inet6_ifaddr *ifp;
5118 struct net_device *dev = idev->dev;
47e27d5e 5119 bool clear_token, update_rs = false;
dc848292 5120 struct in6_addr ll_addr;
f53adae4 5121
c15b1cca
HFS		 5122 ASSERT_RTNL();
5123
63159f29 5124 if (!token)
f53adae4 5125 return -EINVAL;
f53adae4
DB		 5126 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5127 return -EINVAL;
f53adae4
DB		 5128 if (!ipv6_accept_ra(idev))
5129 return -EINVAL;
bd11f074 5130 if (idev->cnf.rtr_solicits == 0)
f53adae4
DB		 5131 return -EINVAL;
5132
5133 write_lock_bh(&idev->lock);
5134
5135 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5136 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5137
5138 write_unlock_bh(&idev->lock);
5139
47e27d5e
DB		 5140 clear_token = ipv6_addr_any(token);
5141 if (clear_token)
5142 goto update_lft;
5143
dc848292
HFS		 5144 if (!idev->dead && (idev->if_flags & IF_READY) &&
5145 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5146 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5147 /* If we're not ready, then normal ifup will take care
5148 * of this. Otherwise, we need to request our rs here.
5149 */
5150 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5151 update_rs = true;
5152 }
f53adae4 5153
47e27d5e 5154update_lft:
f53adae4 5155 write_lock_bh(&idev->lock);
fc403832 5156
77ecaace 5157 if (update_rs) {
fc403832 5158 idev->if_flags |= IF_RS_SENT;
bd11f074
MŻ		 5159 idev->rs_interval = rfc3315_s14_backoff_init(
5160 idev->cnf.rtr_solicit_interval);
77ecaace 5161 idev->rs_probes = 1;
bd11f074 5162 addrconf_mod_rs_timer(idev, idev->rs_interval);
77ecaace 5163 }
f53adae4
DB		 5164
5165 /* Well, that's kinda nasty ... */
5166 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5167 spin_lock(&ifp->lock);
617fe29d 5168 if (ifp->tokenized) {
f53adae4
DB		 5169 ifp->valid_lft = 0;
5170 ifp->prefered_lft = 0;
5171 }
5172 spin_unlock(&ifp->lock);
5173 }
5174
5175 write_unlock_bh(&idev->lock);
b2ed64a9 5176 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 5177 addrconf_verify_rtnl();
f53adae4
DB		 5178 return 0;
5179}
5180
11b1f828
DB		 5181static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5182 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5183 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5184};
5185
5186static int inet6_validate_link_af(const struct net_device *dev,
5187 const struct nlattr *nla)
5188{
5189 struct nlattr *tb[IFLA_INET6_MAX + 1];
5190
5191 if (dev && !__in6_dev_get(dev))
5192 return -EAFNOSUPPORT;
5193
5194 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5195}
5196
f53adae4
DB		 5197static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5198{
5199 int err = -EINVAL;
5200 struct inet6_dev *idev = __in6_dev_get(dev);
5201 struct nlattr *tb[IFLA_INET6_MAX + 1];
5202
5203 if (!idev)
5204 return -EAFNOSUPPORT;
5205
5206 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5207 BUG();
5208
bc91b0f0 5209 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 5210 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 5211 if (err)
5212 return err;
5213 }
5214
5215 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5216 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5217
5218 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
622c81d5 5219 mode != IN6_ADDR_GEN_MODE_NONE &&
cc9da6cc
BM		 5220 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5221 mode != IN6_ADDR_GEN_MODE_RANDOM)
622c81d5
HFS		 5222 return -EINVAL;
5223
5224 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5225 !idev->cnf.stable_secret.initialized &&
5226 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
bc91b0f0 5227 return -EINVAL;
622c81d5 5228
bc91b0f0
JP		 5229 idev->addr_gen_mode = mode;
5230 err = 0;
5231 }
f53adae4
DB		 5232
5233 return err;
5234}
5235
1ab1457c 5236static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5237 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5238{
04561c1f 5239 struct net_device *dev = idev->dev;
04561c1f
TG		 5240 struct ifinfomsg *hdr;
5241 struct nlmsghdr *nlh;
5242 void *protoinfo;
04561c1f 5243
15e47304 5244 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5245 if (!nlh)
26932566 5246 return -EMSGSIZE;
04561c1f
TG		 5247
5248 hdr = nlmsg_data(nlh);
5249 hdr->ifi_family = AF_INET6;
5250 hdr->__ifi_pad = 0;
5251 hdr->ifi_type = dev->type;
5252 hdr->ifi_index = dev->ifindex;
5253 hdr->ifi_flags = dev_get_flags(dev);
5254 hdr->ifi_change = 0;
5255
c78679e8
DM		 5256 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5257 (dev->addr_len &&
5258 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5259 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5260 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5261 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5262 nla_put_u8(skb, IFLA_OPERSTATE,
5263 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5264 goto nla_put_failure;
04561c1f 5265 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 5266 if (!protoinfo)
04561c1f 5267 goto nla_put_failure;
1da177e4 5268
d5566fd7 5269 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5270 goto nla_put_failure;
1da177e4 5271
04561c1f 5272 nla_nest_end(skb, protoinfo);
053c095a
JB		 5273 nlmsg_end(skb, nlh);
5274 return 0;
1da177e4 5275
04561c1f 5276nla_put_failure:
26932566
PM		 5277 nlmsg_cancel(skb, nlh);
5278 return -EMSGSIZE;
1da177e4
LT		 5279}
5280
5281static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5282{
3b1e0a65 5283 struct net *net = sock_net(skb->sk);
84d2697d 5284 int h, s_h;
434a8a58 5285 int idx = 0, s_idx;
1da177e4
LT		 5286 struct net_device *dev;
5287 struct inet6_dev *idev;
84d2697d 5288 struct hlist_head *head;
1da177e4 5289
84d2697d
ED		 5290 s_h = cb->args[0];
5291 s_idx = cb->args[1];
5292
5293 rcu_read_lock();
5294 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5295 idx = 0;
5296 head = &net->dev_index_head[h];
b67bfe0d 5297 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5298 if (idx < s_idx)
5299 goto cont;
5300 idev = __in6_dev_get(dev);
5301 if (!idev)
5302 goto cont;
5303 if (inet6_fill_ifinfo(skb, idev,
15e47304 5304 NETLINK_CB(cb->skb).portid,
84d2697d 5305 cb->nlh->nlmsg_seq,
053c095a 5306 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5307 goto out;
7562f876 5308cont:
84d2697d
ED		 5309 idx++;
5310 }
1da177e4 5311 }
84d2697d
ED		 5312out:
5313 rcu_read_unlock();
5314 cb->args[1] = idx;
5315 cb->args[0] = h;
1da177e4
LT		 5316
5317 return skb->len;
5318}
5319
5320void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5321{
5322 struct sk_buff *skb;
c346dca1 5323 struct net *net = dev_net(idev->dev);
8d7a76c9 5324 int err = -ENOBUFS;
1ab1457c 5325
339bf98f 5326 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5327 if (!skb)
8d7a76c9
TG		 5328 goto errout;
5329
5330 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5331 if (err < 0) {
5332 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5333 WARN_ON(err == -EMSGSIZE);
5334 kfree_skb(skb);
5335 goto errout;
5336 }
5f75a104 5337 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5338 return;
8d7a76c9
TG		 5339errout:
5340 if (err < 0)
5f75a104 5341 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5342}
5343
339bf98f
TG		 5344static inline size_t inet6_prefix_nlmsg_size(void)
5345{
5346 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5347 + nla_total_size(sizeof(struct in6_addr))
5348 + nla_total_size(sizeof(struct prefix_cacheinfo));
5349}
c5396a31 5350
1da177e4 5351static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5352 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5353 int event, unsigned int flags)
1da177e4 5354{
6051e2f4
TG		 5355 struct prefixmsg *pmsg;
5356 struct nlmsghdr *nlh;
1da177e4
LT		 5357 struct prefix_cacheinfo ci;
5358
15e47304 5359 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5360 if (!nlh)
26932566 5361 return -EMSGSIZE;
6051e2f4
TG		 5362
5363 pmsg = nlmsg_data(nlh);
1da177e4 5364 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5365 pmsg->prefix_pad1 = 0;
5366 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5367 pmsg->prefix_ifindex = idev->dev->ifindex;
5368 pmsg->prefix_len = pinfo->prefix_len;
5369 pmsg->prefix_type = pinfo->type;
8a47077a 5370 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5371 pmsg->prefix_flags = 0;
5372 if (pinfo->onlink)
5373 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5374 if (pinfo->autoconf)
5375 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5376
c78679e8
DM		 5377 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5378 goto nla_put_failure;
1da177e4
LT		 5379 ci.preferred_time = ntohl(pinfo->prefered);
5380 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5381 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5382 goto nla_put_failure;
053c095a
JB		 5383 nlmsg_end(skb, nlh);
5384 return 0;
1da177e4 5385
6051e2f4 5386nla_put_failure:
26932566
PM		 5387 nlmsg_cancel(skb, nlh);
5388 return -EMSGSIZE;
1da177e4
LT		 5389}
5390
1ab1457c 5391static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5392 struct prefix_info *pinfo)
5393{
5394 struct sk_buff *skb;
c346dca1 5395 struct net *net = dev_net(idev->dev);
8c384bfa 5396 int err = -ENOBUFS;
1da177e4 5397
339bf98f 5398 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5399 if (!skb)
8c384bfa
TG		 5400 goto errout;
5401
5402 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5403 if (err < 0) {
5404 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5405 WARN_ON(err == -EMSGSIZE);
5406 kfree_skb(skb);
5407 goto errout;
5408 }
1ce85fe4
PNA		 5409 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5410 return;
8c384bfa
TG		 5411errout:
5412 if (err < 0)
6fda7350 5413 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5414}
5415
1da177e4
LT		 5416static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5417{
63998ac2
ND		 5418 struct net *net = dev_net(ifp->idev->dev);
5419
c15b1cca
HFS		 5420 if (event)
5421 ASSERT_RTNL();
5422
1da177e4
LT		 5423 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5424
5425 switch (event) {
5426 case RTM_NEWADDR:
95c385b4
NH		 5427 /*
5428 * If the address was optimistic
5429 * we inserted the route at the start of
5430 * our DAD process, so we don't need
5431 * to do it again
5432 */
5433 if (!(ifp->rt->rt6i_node))
5434 ip6_ins_rt(ifp->rt);
1da177e4
LT		 5435 if (ifp->idev->cnf.forwarding)
5436 addrconf_join_anycast(ifp);
7996c799 5437 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 5438 addrconf_prefix_route(&ifp->peer_addr, 128,
5439 ifp->idev->dev, 0, 0);
1da177e4
LT		 5440 break;
5441 case RTM_DELADDR:
5442 if (ifp->idev->cnf.forwarding)
5443 addrconf_leave_anycast(ifp);
5444 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5445 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 5446 struct rt6_info *rt;
caeaba79 5447
e7478dfc
ND		 5448 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5449 ifp->idev->dev, 0, 0);
8e3d5be7
MKL		 5450 if (rt)
5451 ip6_del_rt(rt);
caeaba79 5452 }
38bd10c4
DA		 5453 if (ifp->rt) {
5454 dst_hold(&ifp->rt->dst);
5455 ip6_del_rt(ifp->rt);
5456 }
705f1c86 5457 rt_genid_bump_ipv6(net);
1da177e4
LT		 5458 break;
5459 }
63998ac2 5460 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5461}
5462
5463static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5464{
8814c4b5 5465 rcu_read_lock_bh();
1da177e4
LT		 5466 if (likely(ifp->idev->dead == 0))
5467 __ipv6_ifa_notify(event, ifp);
8814c4b5 5468 rcu_read_unlock_bh();
1da177e4
LT		 5469}
5470
5471#ifdef CONFIG_SYSCTL
5472
5473static
fe2c6338 5474int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5475 void __user *buffer, size_t *lenp, loff_t *ppos)
5476{
5477 int *valp = ctl->data;
5478 int val = *valp;
88af182e 5479 loff_t pos = *ppos;
fe2c6338 5480 struct ctl_table lctl;
1da177e4
LT		 5481 int ret;
5482
013d97e9
FR		 5483 /*
5484 * ctl->data points to idev->cnf.forwarding, we should
5485 * not modify it until we get the rtnl lock.
5486 */
5487 lctl = *ctl;
5488 lctl.data = &val;
5489
5490 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5491
c8fecf22 5492 if (write)
b325fddb 5493 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5494 if (ret)
5495 *ppos = pos;
1ab1457c 5496 return ret;
1da177e4
LT		 5497}
5498
77751427
ML		 5499static
5500int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5501 void __user *buffer, size_t *lenp, loff_t *ppos)
5502{
5503 struct inet6_dev *idev = ctl->extra1;
5504 int min_mtu = IPV6_MIN_MTU;
5505 struct ctl_table lctl;
5506
5507 lctl = *ctl;
5508 lctl.extra1 = &min_mtu;
5509 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5510
5511 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5512}
5513
56d417b1
BH		 5514static void dev_disable_change(struct inet6_dev *idev)
5515{
75538c2b
CW		 5516 struct netdev_notifier_info info;
5517
56d417b1
BH		 5518 if (!idev || !idev->dev)
5519 return;
5520
75538c2b 5521 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5522 if (idev->cnf.disable_ipv6)
75538c2b 5523 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5524 else
75538c2b 5525 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5526}
5527
5528static void addrconf_disable_change(struct net *net, __s32 newf)
5529{
5530 struct net_device *dev;
5531 struct inet6_dev *idev;
5532
c6d14c84
ED		 5533 rcu_read_lock();
5534 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 5535 idev = __in6_dev_get(dev);
5536 if (idev) {
5537 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5538 idev->cnf.disable_ipv6 = newf;
5539 if (changed)
5540 dev_disable_change(idev);
5541 }
56d417b1 5542 }
c6d14c84 5543 rcu_read_unlock();
56d417b1
BH		 5544}
5545
013d97e9 5546static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5547{
5548 struct net *net;
013d97e9
FR		 5549 int old;
5550
5551 if (!rtnl_trylock())
5552 return restart_syscall();
56d417b1
BH		 5553
5554 net = (struct net *)table->extra2;
013d97e9
FR		 5555 old = *p;
5556 *p = newf;
56d417b1 5557
013d97e9
FR		 5558 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5559 rtnl_unlock();
56d417b1 5560 return 0;
88af182e 5561 }
56d417b1
BH		 5562
5563 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5564 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5565 addrconf_disable_change(net, newf);
013d97e9 5566 } else if ((!newf) ^ (!old))
56d417b1
BH		 5567 dev_disable_change((struct inet6_dev *)table->extra1);
5568
5569 rtnl_unlock();
5570 return 0;
5571}
5572
5573static
fe2c6338 5574int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5575 void __user *buffer, size_t *lenp, loff_t *ppos)
5576{
5577 int *valp = ctl->data;
5578 int val = *valp;
88af182e 5579 loff_t pos = *ppos;
fe2c6338 5580 struct ctl_table lctl;
56d417b1
BH		 5581 int ret;
5582
013d97e9
FR		 5583 /*
5584 * ctl->data points to idev->cnf.disable_ipv6, we should
5585 * not modify it until we get the rtnl lock.
5586 */
5587 lctl = *ctl;
5588 lctl.data = &val;
5589
5590 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5591
5592 if (write)
5593 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5594 if (ret)
5595 *ppos = pos;
56d417b1
BH		 5596 return ret;
5597}
5598
c92d5491 5599static
5600int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5601 void __user *buffer, size_t *lenp, loff_t *ppos)
5602{
5603 int *valp = ctl->data;
5604 int ret;
5605 int old, new;
5606
5607 old = *valp;
5608 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5609 new = *valp;
5610
5611 if (write && old != new) {
5612 struct net *net = ctl->extra2;
5613
5614 if (!rtnl_trylock())
5615 return restart_syscall();
5616
5617 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5618 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5619 NETCONFA_IFINDEX_DEFAULT,
5620 net->ipv6.devconf_dflt);
5621 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5622 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5623 NETCONFA_IFINDEX_ALL,
5624 net->ipv6.devconf_all);
5625 else {
5626 struct inet6_dev *idev = ctl->extra1;
5627
5628 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5629 idev->dev->ifindex,
5630 &idev->cnf);
5631 }
5632 rtnl_unlock();
5633 }
5634
5635 return ret;
5636}
5637
3d1bec99
HFS		 5638static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5639 void __user *buffer, size_t *lenp,
5640 loff_t *ppos)
5641{
5642 int err;
5643 struct in6_addr addr;
5644 char str[IPV6_MAX_STRLEN];
5645 struct ctl_table lctl = *ctl;
622c81d5 5646 struct net *net = ctl->extra2;
3d1bec99
HFS		 5647 struct ipv6_stable_secret *secret = ctl->data;
5648
622c81d5
HFS		 5649 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5650 return -EIO;
5651
3d1bec99
HFS		 5652 lctl.maxlen = IPV6_MAX_STRLEN;
5653 lctl.data = str;
5654
5655 if (!rtnl_trylock())
5656 return restart_syscall();
5657
5658 if (!write && !secret->initialized) {
5659 err = -EIO;
5660 goto out;
5661 }
5662
5449a5ca
WC		 5663 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5664 if (err >= sizeof(str)) {
5665 err = -EIO;
5666 goto out;
3d1bec99
HFS		 5667 }
5668
5669 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5670 if (err || !write)
5671 goto out;
5672
5673 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5674 err = -EIO;
5675 goto out;
5676 }
5677
5678 secret->initialized = true;
5679 secret->secret = addr;
5680
622c81d5
HFS		 5681 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5682 struct net_device *dev;
5683
5684 for_each_netdev(net, dev) {
5685 struct inet6_dev *idev = __in6_dev_get(dev);
5686
5687 if (idev) {
5688 idev->addr_gen_mode =
5689 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5690 }
5691 }
5692 } else {
5693 struct inet6_dev *idev = ctl->extra1;
5694
5695 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5696 }
5697
3d1bec99
HFS		 5698out:
5699 rtnl_unlock();
5700
5701 return err;
5702}
c92d5491 5703
35103d11
AG		 5704static
5705int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5706 int write,
5707 void __user *buffer,
5708 size_t *lenp,
5709 loff_t *ppos)
5710{
5711 int *valp = ctl->data;
5712 int val = *valp;
5713 loff_t pos = *ppos;
5714 struct ctl_table lctl;
5715 int ret;
5716
5717 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5718 * we should not modify it until we get the rtnl lock.
5719 */
5720 lctl = *ctl;
5721 lctl.data = &val;
5722
5723 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5724
5725 if (write)
5726 ret = addrconf_fixup_linkdown(ctl, valp, val);
5727 if (ret)
5728 *ppos = pos;
5729 return ret;
5730}
5731
cb9e684e
MŻ		 5732static const int one = 1;
5733static const int two_five_five = 255;
5734
607ea7cd 5735static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 5736 {
5737 .procname = "forwarding",
5738 .data = &ipv6_devconf.forwarding,
5739 .maxlen = sizeof(int),
5740 .mode = 0644,
5741 .proc_handler = addrconf_sysctl_forward,
5742 },
5743 {
5744 .procname = "hop_limit",
5745 .data = &ipv6_devconf.hop_limit,
5746 .maxlen = sizeof(int),
5747 .mode = 0644,
cb9e684e
MŻ		 5748 .proc_handler = proc_dointvec_minmax,
5749 .extra1 = (void *)&one,
5750 .extra2 = (void *)&two_five_five,
5df1f77f
KK		 5751 },
5752 {
5753 .procname = "mtu",
5754 .data = &ipv6_devconf.mtu6,
5755 .maxlen = sizeof(int),
5756 .mode = 0644,
5757 .proc_handler = addrconf_sysctl_mtu,
5758 },
5759 {
5760 .procname = "accept_ra",
5761 .data = &ipv6_devconf.accept_ra,
5762 .maxlen = sizeof(int),
5763 .mode = 0644,
5764 .proc_handler = proc_dointvec,
5765 },
5766 {
5767 .procname = "accept_redirects",
5768 .data = &ipv6_devconf.accept_redirects,
5769 .maxlen = sizeof(int),
5770 .mode = 0644,
5771 .proc_handler = proc_dointvec,
5772 },
5773 {
5774 .procname = "autoconf",
5775 .data = &ipv6_devconf.autoconf,
5776 .maxlen = sizeof(int),
5777 .mode = 0644,
5778 .proc_handler = proc_dointvec,
5779 },
5780 {
5781 .procname = "dad_transmits",
5782 .data = &ipv6_devconf.dad_transmits,
5783 .maxlen = sizeof(int),
5784 .mode = 0644,
5785 .proc_handler = proc_dointvec,
5786 },
5787 {
5788 .procname = "router_solicitations",
5789 .data = &ipv6_devconf.rtr_solicits,
5790 .maxlen = sizeof(int),
5791 .mode = 0644,
5792 .proc_handler = proc_dointvec,
5793 },
5794 {
5795 .procname = "router_solicitation_interval",
5796 .data = &ipv6_devconf.rtr_solicit_interval,
5797 .maxlen = sizeof(int),
5798 .mode = 0644,
5799 .proc_handler = proc_dointvec_jiffies,
5800 },
bd11f074
MŻ		 5801 {
5802 .procname = "router_solicitation_max_interval",
5803 .data = &ipv6_devconf.rtr_solicit_max_interval,
5804 .maxlen = sizeof(int),
5805 .mode = 0644,
5806 .proc_handler = proc_dointvec_jiffies,
5807 },
5df1f77f
KK		 5808 {
5809 .procname = "router_solicitation_delay",
5810 .data = &ipv6_devconf.rtr_solicit_delay,
5811 .maxlen = sizeof(int),
5812 .mode = 0644,
5813 .proc_handler = proc_dointvec_jiffies,
5814 },
5815 {
5816 .procname = "force_mld_version",
5817 .data = &ipv6_devconf.force_mld_version,
5818 .maxlen = sizeof(int),
5819 .mode = 0644,
5820 .proc_handler = proc_dointvec,
5821 },
5822 {
5823 .procname = "mldv1_unsolicited_report_interval",
5824 .data =
5825 &ipv6_devconf.mldv1_unsolicited_report_interval,
5826 .maxlen = sizeof(int),
5827 .mode = 0644,
5828 .proc_handler = proc_dointvec_ms_jiffies,
5829 },
5830 {
5831 .procname = "mldv2_unsolicited_report_interval",
5832 .data =
5833 &ipv6_devconf.mldv2_unsolicited_report_interval,
5834 .maxlen = sizeof(int),
5835 .mode = 0644,
5836 .proc_handler = proc_dointvec_ms_jiffies,
5837 },
5838 {
5839 .procname = "use_tempaddr",
5840 .data = &ipv6_devconf.use_tempaddr,
5841 .maxlen = sizeof(int),
5842 .mode = 0644,
5843 .proc_handler = proc_dointvec,
5844 },
5845 {
5846 .procname = "temp_valid_lft",
5847 .data = &ipv6_devconf.temp_valid_lft,
5848 .maxlen = sizeof(int),
5849 .mode = 0644,
5850 .proc_handler = proc_dointvec,
5851 },
5852 {
5853 .procname = "temp_prefered_lft",
5854 .data = &ipv6_devconf.temp_prefered_lft,
5855 .maxlen = sizeof(int),
5856 .mode = 0644,
5857 .proc_handler = proc_dointvec,
5858 },
5859 {
5860 .procname = "regen_max_retry",
5861 .data = &ipv6_devconf.regen_max_retry,
5862 .maxlen = sizeof(int),
5863 .mode = 0644,
5864 .proc_handler = proc_dointvec,
5865 },
5866 {
5867 .procname = "max_desync_factor",
5868 .data = &ipv6_devconf.max_desync_factor,
5869 .maxlen = sizeof(int),
5870 .mode = 0644,
5871 .proc_handler = proc_dointvec,
5872 },
5873 {
5874 .procname = "max_addresses",
5875 .data = &ipv6_devconf.max_addresses,
5876 .maxlen = sizeof(int),
5877 .mode = 0644,
5878 .proc_handler = proc_dointvec,
5879 },
5880 {
5881 .procname = "accept_ra_defrtr",
5882 .data = &ipv6_devconf.accept_ra_defrtr,
5883 .maxlen = sizeof(int),
5884 .mode = 0644,
5885 .proc_handler = proc_dointvec,
5886 },
5887 {
5888 .procname = "accept_ra_min_hop_limit",
5889 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5890 .maxlen = sizeof(int),
5891 .mode = 0644,
5892 .proc_handler = proc_dointvec,
5893 },
5894 {
5895 .procname = "accept_ra_pinfo",
5896 .data = &ipv6_devconf.accept_ra_pinfo,
5897 .maxlen = sizeof(int),
5898 .mode = 0644,
5899 .proc_handler = proc_dointvec,
5900 },
930d6ff2 5901#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 5902 {
5903 .procname = "accept_ra_rtr_pref",
5904 .data = &ipv6_devconf.accept_ra_rtr_pref,
5905 .maxlen = sizeof(int),
5906 .mode = 0644,
5907 .proc_handler = proc_dointvec,
5908 },
5909 {
5910 .procname = "router_probe_interval",
5911 .data = &ipv6_devconf.rtr_probe_interval,
5912 .maxlen = sizeof(int),
5913 .mode = 0644,
5914 .proc_handler = proc_dointvec_jiffies,
5915 },
fa03ef38 5916#ifdef CONFIG_IPV6_ROUTE_INFO
5df1f77f
KK		 5917 {
5918 .procname = "accept_ra_rt_info_max_plen",
5919 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5920 .maxlen = sizeof(int),
5921 .mode = 0644,
5922 .proc_handler = proc_dointvec,
5923 },
09c884d4 5924#endif
930d6ff2 5925#endif
5df1f77f
KK		 5926 {
5927 .procname = "proxy_ndp",
5928 .data = &ipv6_devconf.proxy_ndp,
5929 .maxlen = sizeof(int),
5930 .mode = 0644,
5931 .proc_handler = addrconf_sysctl_proxy_ndp,
5932 },
5933 {
5934 .procname = "accept_source_route",
5935 .data = &ipv6_devconf.accept_source_route,
5936 .maxlen = sizeof(int),
5937 .mode = 0644,
5938 .proc_handler = proc_dointvec,
5939 },
95c385b4 5940#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 5941 {
5942 .procname = "optimistic_dad",
5943 .data = &ipv6_devconf.optimistic_dad,
5944 .maxlen = sizeof(int),
5945 .mode = 0644,
5946 .proc_handler = proc_dointvec,
5947 },
5948 {
5949 .procname = "use_optimistic",
5950 .data = &ipv6_devconf.use_optimistic,
5951 .maxlen = sizeof(int),
5952 .mode = 0644,
5953 .proc_handler = proc_dointvec,
5954 },
7bc570c8
YH		 5955#endif
5956#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 5957 {
5958 .procname = "mc_forwarding",
5959 .data = &ipv6_devconf.mc_forwarding,
5960 .maxlen = sizeof(int),
5961 .mode = 0444,
5962 .proc_handler = proc_dointvec,
5963 },
95c385b4 5964#endif
5df1f77f
KK		 5965 {
5966 .procname = "disable_ipv6",
5967 .data = &ipv6_devconf.disable_ipv6,
5968 .maxlen = sizeof(int),
5969 .mode = 0644,
5970 .proc_handler = addrconf_sysctl_disable,
5971 },
5972 {
5973 .procname = "accept_dad",
5974 .data = &ipv6_devconf.accept_dad,
5975 .maxlen = sizeof(int),
5976 .mode = 0644,
5977 .proc_handler = proc_dointvec,
5978 },
5979 {
5980 .procname = "force_tllao",
5981 .data = &ipv6_devconf.force_tllao,
5982 .maxlen = sizeof(int),
5983 .mode = 0644,
5984 .proc_handler = proc_dointvec
5985 },
5986 {
5987 .procname = "ndisc_notify",
5988 .data = &ipv6_devconf.ndisc_notify,
5989 .maxlen = sizeof(int),
5990 .mode = 0644,
5991 .proc_handler = proc_dointvec
5992 },
5993 {
5994 .procname = "suppress_frag_ndisc",
5995 .data = &ipv6_devconf.suppress_frag_ndisc,
5996 .maxlen = sizeof(int),
5997 .mode = 0644,
5998 .proc_handler = proc_dointvec
5999 },
6000 {
6001 .procname = "accept_ra_from_local",
6002 .data = &ipv6_devconf.accept_ra_from_local,
6003 .maxlen = sizeof(int),
6004 .mode = 0644,
6005 .proc_handler = proc_dointvec,
6006 },
6007 {
6008 .procname = "accept_ra_mtu",
6009 .data = &ipv6_devconf.accept_ra_mtu,
6010 .maxlen = sizeof(int),
6011 .mode = 0644,
6012 .proc_handler = proc_dointvec,
6013 },
6014 {
6015 .procname = "stable_secret",
6016 .data = &ipv6_devconf.stable_secret,
6017 .maxlen = IPV6_MAX_STRLEN,
6018 .mode = 0600,
6019 .proc_handler = addrconf_sysctl_stable_secret,
6020 },
6021 {
6022 .procname = "use_oif_addrs_only",
6023 .data = &ipv6_devconf.use_oif_addrs_only,
6024 .maxlen = sizeof(int),
6025 .mode = 0644,
6026 .proc_handler = proc_dointvec,
6027 },
6028 {
6029 .procname = "ignore_routes_with_linkdown",
6030 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6031 .maxlen = sizeof(int),
6032 .mode = 0644,
6033 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6034 },
6035 {
6036 .procname = "drop_unicast_in_l2_multicast",
6037 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6038 .maxlen = sizeof(int),
6039 .mode = 0644,
6040 .proc_handler = proc_dointvec,
6041 },
6042 {
6043 .procname = "drop_unsolicited_na",
6044 .data = &ipv6_devconf.drop_unsolicited_na,
6045 .maxlen = sizeof(int),
6046 .mode = 0644,
6047 .proc_handler = proc_dointvec,
6048 },
6049 {
6050 .procname = "keep_addr_on_down",
6051 .data = &ipv6_devconf.keep_addr_on_down,
6052 .maxlen = sizeof(int),
6053 .mode = 0644,
6054 .proc_handler = proc_dointvec,
6055
6056 },
6057 {
6058 /* sentinel */
6059 }
1da177e4
LT		 6060};
6061
bff16c2f 6062static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 6063 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4 6064{
29c994e3 6065 int i, ifindex;
607ea7cd 6066 struct ctl_table *table;
6105e293 6067 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 6068
607ea7cd
KK		 6069 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6070 if (!table)
f68635e6
PE		 6071 goto out;
6072
607ea7cd
KK		 6073 for (i = 0; table[i].data; i++) {
6074 table[i].data += (char *)p - (char *)&ipv6_devconf;
cb9e684e
MŻ		 6075 /* If one of these is already set, then it is not safe to
6076 * overwrite either of them: this makes proc_dointvec_minmax
6077 * usable.
6078 */
6079 if (!table[i].extra1 && !table[i].extra2) {
6080 table[i].extra1 = idev; /* embedded; no ref */
6081 table[i].extra2 = net;
6082 }
1da177e4 6083 }
1da177e4 6084
6105e293 6085 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 6086
607ea7cd
KK		 6087 p->sysctl_header = register_net_sysctl(net, path, table);
6088 if (!p->sysctl_header)
6105e293 6089 goto free;
f68635e6 6090
29c994e3
ND		 6091 if (!strcmp(dev_name, "all"))
6092 ifindex = NETCONFA_IFINDEX_ALL;
6093 else if (!strcmp(dev_name, "default"))
6094 ifindex = NETCONFA_IFINDEX_DEFAULT;
6095 else
6096 ifindex = idev->dev->ifindex;
6097 inet6_netconf_notify_devconf(net, NETCONFA_ALL, ifindex, p);
95897312 6098 return 0;
1da177e4 6099
f68635e6 6100free:
607ea7cd 6101 kfree(table);
f68635e6 6102out:
95897312 6103 return -ENOBUFS;
1da177e4
LT		 6104}
6105
408c4768
PE		 6106static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
6107{
607ea7cd 6108 struct ctl_table *table;
408c4768 6109
607ea7cd 6110 if (!p->sysctl_header)
408c4768
PE		 6111 return;
6112
607ea7cd
KK		 6113 table = p->sysctl_header->ctl_table_arg;
6114 unregister_net_sysctl_table(p->sysctl_header);
6115 p->sysctl_header = NULL;
6116 kfree(table);
408c4768
PE		 6117}
6118
a317a2f1 6119static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 6120{
a317a2f1
WC		 6121 int err;
6122
6123 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6124 return -EINVAL;
6125
6126 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6127 &ndisc_ifinfo_sysctl_change);
6128 if (err)
6129 return err;
6130 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6131 idev, &idev->cnf);
6132 if (err)
6133 neigh_sysctl_unregister(idev->nd_parms);
6134
6135 return err;
f52295a9
PE		 6136}
6137
408c4768 6138static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 6139{
408c4768
PE		 6140 __addrconf_sysctl_unregister(&idev->cnf);
6141 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 6142}
6143
6144
6145#endif
6146
2c8c1e72 6147static int __net_init addrconf_init_net(struct net *net)
e0da5a48 6148{
a79ca223 6149 int err = -ENOMEM;
e0da5a48
PE		 6150 struct ipv6_devconf *all, *dflt;
6151
a79ca223 6152 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 6153 if (!all)
a79ca223 6154 goto err_alloc_all;
e0da5a48 6155
a79ca223 6156 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 6157 if (!dflt)
a79ca223 6158 goto err_alloc_dflt;
e0da5a48 6159
a79ca223
HZ		 6160 /* these will be inherited by all namespaces */
6161 dflt->autoconf = ipv6_defaults.autoconf;
6162 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 6163
3d1bec99
HFS		 6164 dflt->stable_secret.initialized = false;
6165 all->stable_secret.initialized = false;
6166
e0da5a48
PE		 6167 net->ipv6.devconf_all = all;
6168 net->ipv6.devconf_dflt = dflt;
6169
6170#ifdef CONFIG_SYSCTL
f8572d8f 6171 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 6172 if (err < 0)
6173 goto err_reg_all;
6174
f8572d8f 6175 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 6176 if (err < 0)
6177 goto err_reg_dflt;
6178#endif
6179 return 0;
6180
6181#ifdef CONFIG_SYSCTL
6182err_reg_dflt:
6183 __addrconf_sysctl_unregister(all);
6184err_reg_all:
6185 kfree(dflt);
6186#endif
6187err_alloc_dflt:
6188 kfree(all);
6189err_alloc_all:
6190 return err;
6191}
6192
2c8c1e72 6193static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 6194{
6195#ifdef CONFIG_SYSCTL
6196 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
6197 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
6198#endif
73cf0e92 6199 kfree(net->ipv6.devconf_dflt);
6200 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 6201}
6202
6203static struct pernet_operations addrconf_ops = {
6204 .init = addrconf_init_net,
6205 .exit = addrconf_exit_net,
6206};
6207
207895fd 6208static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 6209 .family = AF_INET6,
6210 .fill_link_af = inet6_fill_link_af,
6211 .get_link_af_size = inet6_get_link_af_size,
11b1f828 6212 .validate_link_af = inet6_validate_link_af,
f53adae4 6213 .set_link_af = inet6_set_link_af,
b382b191
TG		 6214};
6215
1da177e4
LT		 6216/*
6217 * Init / cleanup code
6218 */
6219
6220int __init addrconf_init(void)
6221{
a317a2f1 6222 struct inet6_dev *idev;
c2e21293 6223 int i, err;
2a8cc6c8 6224
e21e8467
SH		 6225 err = ipv6_addr_label_init();
6226 if (err < 0) {
f3213831
JP		 6227 pr_crit("%s: cannot initialize default policy table: %d\n",
6228 __func__, err);
2cc6d2bf 6229 goto out;
2a8cc6c8 6230 }
1da177e4 6231
2cc6d2bf
NH		 6232 err = register_pernet_subsys(&addrconf_ops);
6233 if (err < 0)
6234 goto out_addrlabel;
e0da5a48 6235
c15b1cca
HFS		 6236 addrconf_wq = create_workqueue("ipv6_addrconf");
6237 if (!addrconf_wq) {
6238 err = -ENOMEM;
6239 goto out_nowq;
6240 }
6241
1da177e4
LT		 6242 /* The addrconf netdev notifier requires that loopback_dev
6243 * has it's ipv6 private information allocated and setup
6244 * before it can bring up and give link-local addresses
6245 * to other devices which are up.
6246 *
6247 * Unfortunately, loopback_dev is not necessarily the first
6248 * entry in the global dev_base list of net devices. In fact,
6249 * it is likely to be the very last entry on that list.
6250 * So this causes the notifier registry below to try and
6251 * give link-local addresses to all devices besides loopback_dev
6252 * first, then loopback_dev, which cases all the non-loopback_dev
6253 * devices to fail to get a link-local address.
6254 *
6255 * So, as a temporary fix, allocate the ipv6 structure for
6256 * loopback_dev first by hand.
6257 * Longer term, all of the dependencies ipv6 has upon the loopback
6258 * device and it being up should be removed.
6259 */
6260 rtnl_lock();
a317a2f1 6261 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 6262 rtnl_unlock();
a317a2f1
WC		 6263 if (IS_ERR(idev)) {
6264 err = PTR_ERR(idev);
e0da5a48 6265 goto errlo;
a317a2f1 6266 }
1da177e4 6267
c2e21293 6268 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6269 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6270
1da177e4
LT		 6271 register_netdevice_notifier(&ipv6_dev_notf);
6272
c15b1cca 6273 addrconf_verify();
c127ea2c 6274
3678a9d8 6275 rtnl_af_register(&inet6_ops);
b382b191 6276
c7ac8679
GR		 6277 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6278 NULL);
c127ea2c
TG		 6279 if (err < 0)
6280 goto errout;
6281
6282 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 6283 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6284 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6285 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6286 inet6_dump_ifaddr, NULL);
6287 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6288 inet6_dump_ifmcaddr, NULL);
6289 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6290 inet6_dump_ifacaddr, NULL);
76f8f6cb 6291 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 6292 inet6_netconf_dump_devconf, NULL);
c127ea2c 6293
2a8cc6c8
YH		 6294 ipv6_addr_label_rtnl_register();
6295
1da177e4 6296 return 0;
c127ea2c 6297errout:
b382b191 6298 rtnl_af_unregister(&inet6_ops);
c127ea2c 6299 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6300errlo:
c15b1cca
HFS		 6301 destroy_workqueue(addrconf_wq);
6302out_nowq:
e0da5a48 6303 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 6304out_addrlabel:
6305 ipv6_addr_label_cleanup();
6306out:
c127ea2c 6307 return err;
1da177e4
LT		 6308}
6309
09f7709f 6310void addrconf_cleanup(void)
1da177e4 6311{
176c39af 6312 struct net_device *dev;
1da177e4
LT		 6313 int i;
6314
6315 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6316 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 6317 ipv6_addr_label_cleanup();
1da177e4
LT		 6318
6319 rtnl_lock();
6320
b382b191
TG		 6321 __rtnl_af_unregister(&inet6_ops);
6322
176c39af
DL		 6323 /* clean dev list */
6324 for_each_netdev(&init_net, dev) {
6325 if (__in6_dev_get(dev) == NULL)
6326 continue;
6327 addrconf_ifdown(dev, 1);
6328 }
6329 addrconf_ifdown(init_net.loopback_dev, 2);
6330
1da177e4
LT		 6331 /*
6332 * Check hash table.
6333 */
5c578aed 6334 spin_lock_bh(&addrconf_hash_lock);
c2e21293 6335 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6336 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 6337 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 6338 cancel_delayed_work(&addr_chk_work);
1da177e4 6339 rtnl_unlock();
c15b1cca
HFS		 6340
6341 destroy_workqueue(addrconf_wq);
1da177e4 6342}
Linux 6.x block layer and io_uring tree(s)