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[mirror_ubuntu-jammy-kernel.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
174cd4b1 46#include <linux/sched/signal.h>
1da177e4
LT		 47#include <linux/socket.h>
48#include <linux/sockios.h>
1da177e4 49#include <linux/net.h>
3d1bec99 50#include <linux/inet.h>
1da177e4
LT		 51#include <linux/in6.h>
52#include <linux/netdevice.h>
1823730f 53#include <linux/if_addr.h>
1da177e4
LT		 54#include <linux/if_arp.h>
55#include <linux/if_arcnet.h>
56#include <linux/if_infiniband.h>
57#include <linux/route.h>
58#include <linux/inetdevice.h>
59#include <linux/init.h>
5a0e3ad6 60#include <linux/slab.h>
1da177e4
LT		 61#ifdef CONFIG_SYSCTL
62#include <linux/sysctl.h>
63#endif
4fc268d2 64#include <linux/capability.h>
1da177e4
LT		 65#include <linux/delay.h>
66#include <linux/notifier.h>
543537bd 67#include <linux/string.h>
ddbe5032 68#include <linux/hash.h>
1da177e4 69
457c4cbc 70#include <net/net_namespace.h>
1da177e4
LT		 71#include <net/sock.h>
72#include <net/snmp.h>
73
5241c2d7 74#include <net/6lowpan.h>
cb6bf355 75#include <net/firewire.h>
1da177e4
LT		 76#include <net/ipv6.h>
77#include <net/protocol.h>
78#include <net/ndisc.h>
79#include <net/ip6_route.h>
80#include <net/addrconf.h>
81#include <net/tcp.h>
82#include <net/ip.h>
5d620266 83#include <net/netlink.h>
f24e3d65 84#include <net/pkt_sched.h>
ca254490 85#include <net/l3mdev.h>
1da177e4
LT		 86#include <linux/if_tunnel.h>
87#include <linux/rtnetlink.h>
f3a1bfb1 88#include <linux/netconf.h>
1da177e4 89#include <linux/random.h>
e21e8467 90#include <linux/uaccess.h>
7f7d9a6b 91#include <asm/unaligned.h>
1da177e4
LT		 92
93#include <linux/proc_fs.h>
94#include <linux/seq_file.h>
bc3b2d7f 95#include <linux/export.h>
1da177e4
LT		 96
97/* Set to 3 to get tracing... */
98#define ACONF_DEBUG 2
99
100#if ACONF_DEBUG >= 3
ba3542e1 101#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
1da177e4 102#else
ba3542e1 103#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
1da177e4
LT		 104#endif
105
106#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e 107
3d1bec99
HFS		 108#define IPV6_MAX_STRLEN \
109 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
110
18a31e1e
TG		 111static inline u32 cstamp_delta(unsigned long cstamp)
112{
113 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
114}
1da177e4 115
bd11f074
MŻ		 116static inline s32 rfc3315_s14_backoff_init(s32 irt)
117{
118 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
119 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
120 do_div(tmp, 1000000);
121 return (s32)tmp;
122}
123
124static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
125{
126 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
127 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
128 do_div(tmp, 1000000);
129 if ((s32)tmp > mrt) {
130 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
131 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
132 do_div(tmp, 1000000);
133 }
134 return (s32)tmp;
135}
136
1da177e4 137#ifdef CONFIG_SYSCTL
a317a2f1 138static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 139static void addrconf_sysctl_unregister(struct inet6_dev *idev);
140#else
a317a2f1 141static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 142{
a317a2f1 143 return 0;
408c4768
PE		 144}
145
146static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
147{
148}
1da177e4
LT		 149#endif
150
9d6280da
JB		 151static void ipv6_regen_rndid(struct inet6_dev *idev);
152static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
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);
764d3be6 187static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id);
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 226#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 227 .accept_ra_rt_info_min_plen = 0,
09c884d4
YH		 228 .accept_ra_rt_info_max_plen = 0,
229#endif
930d6ff2 230#endif
fbea49e1 231 .proxy_ndp = 0,
0bcbc926 232 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 233 .disable_ipv6 = 0,
1b34be74 234 .accept_dad = 1,
b800c3b9 235 .suppress_frag_ndisc = 1,
c2943f14 236 .accept_ra_mtu = 1,
3d1bec99
HFS		 237 .stable_secret = {
238 .initialized = false,
3985e8a3
EK		 239 },
240 .use_oif_addrs_only = 0,
35103d11 241 .ignore_routes_with_linkdown = 0,
f1705ec1 242 .keep_addr_on_down = 0,
1ababeba 243 .seg6_enabled = 0,
bf355b8d
DL		 244#ifdef CONFIG_IPV6_SEG6_HMAC
245 .seg6_require_hmac = 0,
246#endif
adc176c5 247 .enhanced_dad = 1,
d35a00b8 248 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
df789fe7 249 .disable_policy = 0,
1da177e4
LT		 250};
251
ab32ea5d 252static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 253 .forwarding = 0,
254 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
255 .mtu6 = IPV6_MIN_MTU,
256 .accept_ra = 1,
257 .accept_redirects = 1,
258 .autoconf = 1,
fc4eba58
HFS		 259 .force_mld_version = 0,
260 .mldv1_unsolicited_report_interval = 10 * HZ,
261 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 262 .dad_transmits = 1,
263 .rtr_solicits = MAX_RTR_SOLICITATIONS,
264 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 265 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 266 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 267 .use_tempaddr = 0,
268 .temp_valid_lft = TEMP_VALID_LIFETIME,
269 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
270 .regen_max_retry = REGEN_MAX_RETRY,
271 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 272 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 273 .accept_ra_defrtr = 1,
d9333196 274 .accept_ra_from_local = 0,
8013d1d7 275 .accept_ra_min_hop_limit= 1,
c4fd30eb 276 .accept_ra_pinfo = 1,
930d6ff2
YH		 277#ifdef CONFIG_IPV6_ROUTER_PREF
278 .accept_ra_rtr_pref = 1,
52e16356 279 .rtr_probe_interval = 60 * HZ,
09c884d4 280#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 281 .accept_ra_rt_info_min_plen = 0,
09c884d4
YH		 282 .accept_ra_rt_info_max_plen = 0,
283#endif
930d6ff2 284#endif
fbea49e1 285 .proxy_ndp = 0,
0bcbc926 286 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 287 .disable_ipv6 = 0,
1b34be74 288 .accept_dad = 1,
b800c3b9 289 .suppress_frag_ndisc = 1,
c2943f14 290 .accept_ra_mtu = 1,
3d1bec99
HFS		 291 .stable_secret = {
292 .initialized = false,
293 },
3985e8a3 294 .use_oif_addrs_only = 0,
35103d11 295 .ignore_routes_with_linkdown = 0,
f1705ec1 296 .keep_addr_on_down = 0,
1ababeba 297 .seg6_enabled = 0,
bf355b8d
DL		 298#ifdef CONFIG_IPV6_SEG6_HMAC
299 .seg6_require_hmac = 0,
300#endif
adc176c5 301 .enhanced_dad = 1,
d35a00b8 302 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
df789fe7 303 .disable_policy = 0,
1da177e4
LT		 304};
305
f24e3d65 306/* Check if a valid qdisc is available */
05297949 307static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 308{
05297949 309 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 310}
311
b7b1bfce 312static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 313{
b7b1bfce
HFS		 314 if (del_timer(&idev->rs_timer))
315 __in6_dev_put(idev);
316}
317
c15b1cca 318static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 319{
c15b1cca 320 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 321 __in6_ifa_put(ifp);
322}
323
b7b1bfce
HFS		 324static void addrconf_mod_rs_timer(struct inet6_dev *idev,
325 unsigned long when)
326{
327 if (!timer_pending(&idev->rs_timer))
328 in6_dev_hold(idev);
329 mod_timer(&idev->rs_timer, jiffies + when);
330}
1da177e4 331
c15b1cca
HFS		 332static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
333 unsigned long delay)
1da177e4 334{
c15b1cca 335 if (!delayed_work_pending(&ifp->dad_work))
1da177e4 336 in6_ifa_hold(ifp);
c15b1cca 337 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
1da177e4
LT		 338}
339
7f7d9a6b
HX		 340static int snmp6_alloc_dev(struct inet6_dev *idev)
341{
827da44c
JS		 342 int i;
343
698365fa
WC		 344 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
345 if (!idev->stats.ipv6)
7f7d9a6b 346 goto err_ip;
827da44c
JS		 347
348 for_each_possible_cpu(i) {
349 struct ipstats_mib *addrconf_stats;
698365fa 350 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 351 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 352 }
353
354
be281e55
ED		 355 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
356 GFP_KERNEL);
357 if (!idev->stats.icmpv6dev)
7f7d9a6b 358 goto err_icmp;
be281e55
ED		 359 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
360 GFP_KERNEL);
361 if (!idev->stats.icmpv6msgdev)
14878f75 362 goto err_icmpmsg;
7f7d9a6b
HX		 363
364 return 0;
365
14878f75 366err_icmpmsg:
be281e55 367 kfree(idev->stats.icmpv6dev);
7f7d9a6b 368err_icmp:
698365fa 369 free_percpu(idev->stats.ipv6);
7f7d9a6b 370err_ip:
aaf70ec7 371 return -ENOMEM;
7f7d9a6b
HX		 372}
373
8e5e8f30 374static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 375{
376 struct inet6_dev *ndev;
a317a2f1 377 int err = -ENOMEM;
1da177e4
LT		 378
379 ASSERT_RTNL();
380
381 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 382 return ERR_PTR(-EINVAL);
1da177e4 383
1ab1457c 384 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
63159f29 385 if (!ndev)
a317a2f1 386 return ERR_PTR(err);
322f74a4
IO		 387
388 rwlock_init(&ndev->lock);
389 ndev->dev = dev;
502a2ffd 390 INIT_LIST_HEAD(&ndev->addr_list);
b7b1bfce
HFS		 391 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
392 (unsigned long)ndev);
c346dca1 393 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
9b29c696
HFS		 394
395 if (ndev->cnf.stable_secret.initialized)
d35a00b8 396 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
9b29c696 397 else
d35a00b8 398 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode;
9b29c696 399
322f74a4 400 ndev->cnf.mtu6 = dev->mtu;
322f74a4 401 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
63159f29 402 if (!ndev->nd_parms) {
322f74a4 403 kfree(ndev);
a317a2f1 404 return ERR_PTR(err);
322f74a4 405 }
0187bdfb
BH		 406 if (ndev->cnf.forwarding)
407 dev_disable_lro(dev);
322f74a4
IO		 408 /* We refer to the device */
409 dev_hold(dev);
1da177e4 410
322f74a4 411 if (snmp6_alloc_dev(ndev) < 0) {
ba3542e1 412 ADBG(KERN_WARNING
f3213831 413 "%s: cannot allocate memory for statistics; dev=%s.\n",
ba3542e1 414 __func__, dev->name);
322f74a4 415 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 416 dev_put(dev);
417 kfree(ndev);
a317a2f1 418 return ERR_PTR(err);
322f74a4 419 }
1da177e4 420
322f74a4 421 if (snmp6_register_dev(ndev) < 0) {
ba3542e1 422 ADBG(KERN_WARNING
f3213831 423 "%s: cannot create /proc/net/dev_snmp6/%s\n",
ba3542e1 424 __func__, dev->name);
a317a2f1 425 goto err_release;
322f74a4
IO		 426 }
427
9d6280da 428 /* One reference from device. */
322f74a4 429 in6_dev_hold(ndev);
1da177e4 430
1b34be74
YH		 431 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
432 ndev->cnf.accept_dad = -1;
433
07a93626 434#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 435 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 436 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 437 ndev->cnf.rtr_solicits = 0;
438 }
439#endif
440
372e6c8f 441 INIT_LIST_HEAD(&ndev->tempaddr_list);
76506a98 442 ndev->desync_factor = U32_MAX;
322f74a4
IO		 443 if ((dev->flags&IFF_LOOPBACK) ||
444 dev->type == ARPHRD_TUNNEL ||
9625ed72 445 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 446 dev->type == ARPHRD_SIT ||
0be669bb 447 dev->type == ARPHRD_NONE) {
322f74a4 448 ndev->cnf.use_tempaddr = -1;
9d6280da
JB		 449 } else
450 ipv6_regen_rndid(ndev);
5d9efa7e 451
914faa14 452 ndev->token = in6addr_any;
1da177e4 453
f24e3d65 454 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 455 ndev->if_flags |= IF_READY;
456
322f74a4
IO		 457 ipv6_mc_init_dev(ndev);
458 ndev->tstamp = jiffies;
a317a2f1
WC		 459 err = addrconf_sysctl_register(ndev);
460 if (err) {
461 ipv6_mc_destroy_dev(ndev);
2a189f9e 462 snmp6_unregister_dev(ndev);
a317a2f1
WC		 463 goto err_release;
464 }
30c4cf57 465 /* protected by rtnl_lock */
cf778b00 466 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 467
2c5e8933
HFS		 468 /* Join interface-local all-node multicast group */
469 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
470
d88ae4cc 471 /* Join all-node multicast group */
f3ee4010 472 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 473
d6ddef9e 474 /* Join all-router multicast group if forwarding is set */
8b2aaede 475 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 476 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
477
1da177e4 478 return ndev;
a317a2f1
WC		 479
480err_release:
481 neigh_parms_release(&nd_tbl, ndev->nd_parms);
482 ndev->dead = 1;
483 in6_dev_finish_destroy(ndev);
484 return ERR_PTR(err);
1da177e4
LT		 485}
486
8e5e8f30 487static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 488{
489 struct inet6_dev *idev;
490
491 ASSERT_RTNL();
492
e21e8467
SH		 493 idev = __in6_dev_get(dev);
494 if (!idev) {
495 idev = ipv6_add_dev(dev);
a317a2f1 496 if (IS_ERR(idev))
1da177e4
LT		 497 return NULL;
498 }
c5e33bdd 499
1da177e4
LT		 500 if (dev->flags&IFF_UP)
501 ipv6_mc_up(idev);
502 return idev;
503}
504
f3a1bfb1
ND		 505static int inet6_netconf_msgsize_devconf(int type)
506{
507 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
508 + nla_total_size(4); /* NETCONFA_IFINDEX */
136ba622 509 bool all = false;
f3a1bfb1 510
136ba622
ZS		 511 if (type == NETCONFA_ALL)
512 all = true;
513
514 if (all || type == NETCONFA_FORWARDING)
f3a1bfb1 515 size += nla_total_size(4);
b1afce95 516#ifdef CONFIG_IPV6_MROUTE
136ba622 517 if (all || type == NETCONFA_MC_FORWARDING)
d67b8c61 518 size += nla_total_size(4);
b1afce95 519#endif
136ba622 520 if (all || type == NETCONFA_PROXY_NEIGH)
c92d5491 521 size += nla_total_size(4);
f3a1bfb1 522
136ba622 523 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
35103d11
AG		 524 size += nla_total_size(4);
525
f3a1bfb1
ND		 526 return size;
527}
528
529static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
530 struct ipv6_devconf *devconf, u32 portid,
531 u32 seq, int event, unsigned int flags,
532 int type)
533{
534 struct nlmsghdr *nlh;
535 struct netconfmsg *ncm;
136ba622 536 bool all = false;
f3a1bfb1
ND		 537
538 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
539 flags);
63159f29 540 if (!nlh)
f3a1bfb1
ND		 541 return -EMSGSIZE;
542
136ba622
ZS		 543 if (type == NETCONFA_ALL)
544 all = true;
545
f3a1bfb1
ND		 546 ncm = nlmsg_data(nlh);
547 ncm->ncm_family = AF_INET6;
548
549 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
550 goto nla_put_failure;
551
23452170
DA		 552 if (!devconf)
553 goto out;
554
136ba622 555 if ((all || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 556 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
557 goto nla_put_failure;
b1afce95 558#ifdef CONFIG_IPV6_MROUTE
136ba622 559 if ((all || type == NETCONFA_MC_FORWARDING) &&
d67b8c61
ND		 560 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
561 devconf->mc_forwarding) < 0)
562 goto nla_put_failure;
b1afce95 563#endif
136ba622 564 if ((all || type == NETCONFA_PROXY_NEIGH) &&
c92d5491 565 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
566 goto nla_put_failure;
567
136ba622 568 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
35103d11
AG		 569 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
570 devconf->ignore_routes_with_linkdown) < 0)
571 goto nla_put_failure;
572
23452170 573out:
053c095a
JB		 574 nlmsg_end(skb, nlh);
575 return 0;
f3a1bfb1
ND		 576
577nla_put_failure:
578 nlmsg_cancel(skb, nlh);
579 return -EMSGSIZE;
580}
581
85b3daad
DA		 582void inet6_netconf_notify_devconf(struct net *net, int event, int type,
583 int ifindex, struct ipv6_devconf *devconf)
f3a1bfb1
ND		 584{
585 struct sk_buff *skb;
586 int err = -ENOBUFS;
587
927265bc 588 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
63159f29 589 if (!skb)
f3a1bfb1
ND		 590 goto errout;
591
592 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
85b3daad 593 event, 0, type);
f3a1bfb1
ND		 594 if (err < 0) {
595 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
596 WARN_ON(err == -EMSGSIZE);
597 kfree_skb(skb);
598 goto errout;
599 }
927265bc 600 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
f3a1bfb1
ND		 601 return;
602errout:
bd779028 603 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 604}
605
76f8f6cb
ND		 606static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
607 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
608 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 609 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
35103d11 610 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
76f8f6cb
ND		 611};
612
613static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 614 struct nlmsghdr *nlh)
76f8f6cb
ND		 615{
616 struct net *net = sock_net(in_skb->sk);
617 struct nlattr *tb[NETCONFA_MAX+1];
618 struct netconfmsg *ncm;
619 struct sk_buff *skb;
620 struct ipv6_devconf *devconf;
621 struct inet6_dev *in6_dev;
622 struct net_device *dev;
623 int ifindex;
624 int err;
625
626 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
627 devconf_ipv6_policy);
628 if (err < 0)
629 goto errout;
630
a97eb33f 631 err = -EINVAL;
76f8f6cb
ND		 632 if (!tb[NETCONFA_IFINDEX])
633 goto errout;
634
635 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
636 switch (ifindex) {
637 case NETCONFA_IFINDEX_ALL:
638 devconf = net->ipv6.devconf_all;
639 break;
640 case NETCONFA_IFINDEX_DEFAULT:
641 devconf = net->ipv6.devconf_dflt;
642 break;
643 default:
644 dev = __dev_get_by_index(net, ifindex);
63159f29 645 if (!dev)
76f8f6cb
ND		 646 goto errout;
647 in6_dev = __in6_dev_get(dev);
63159f29 648 if (!in6_dev)
76f8f6cb
ND		 649 goto errout;
650 devconf = &in6_dev->cnf;
651 break;
652 }
653
654 err = -ENOBUFS;
136ba622 655 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
63159f29 656 if (!skb)
76f8f6cb
ND		 657 goto errout;
658
659 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
660 NETLINK_CB(in_skb).portid,
661 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
136ba622 662 NETCONFA_ALL);
76f8f6cb
ND		 663 if (err < 0) {
664 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
665 WARN_ON(err == -EMSGSIZE);
666 kfree_skb(skb);
667 goto errout;
668 }
669 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
670errout:
671 return err;
672}
673
7a674200
ND		 674static int inet6_netconf_dump_devconf(struct sk_buff *skb,
675 struct netlink_callback *cb)
676{
677 struct net *net = sock_net(skb->sk);
678 int h, s_h;
679 int idx, s_idx;
680 struct net_device *dev;
681 struct inet6_dev *idev;
682 struct hlist_head *head;
683
684 s_h = cb->args[0];
685 s_idx = idx = cb->args[1];
686
687 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
688 idx = 0;
689 head = &net->dev_index_head[h];
690 rcu_read_lock();
63998ac2
ND		 691 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
692 net->dev_base_seq;
7a674200
ND		 693 hlist_for_each_entry_rcu(dev, head, index_hlist) {
694 if (idx < s_idx)
695 goto cont;
696 idev = __in6_dev_get(dev);
697 if (!idev)
698 goto cont;
699
700 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
701 &idev->cnf,
702 NETLINK_CB(cb->skb).portid,
703 cb->nlh->nlmsg_seq,
704 RTM_NEWNETCONF,
705 NLM_F_MULTI,
136ba622 706 NETCONFA_ALL) < 0) {
7a674200
ND		 707 rcu_read_unlock();
708 goto done;
709 }
63998ac2 710 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 711cont:
712 idx++;
713 }
714 rcu_read_unlock();
715 }
716 if (h == NETDEV_HASHENTRIES) {
717 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
718 net->ipv6.devconf_all,
719 NETLINK_CB(cb->skb).portid,
720 cb->nlh->nlmsg_seq,
721 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 722 NETCONFA_ALL) < 0)
7a674200
ND		 723 goto done;
724 else
725 h++;
726 }
727 if (h == NETDEV_HASHENTRIES + 1) {
728 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
729 net->ipv6.devconf_dflt,
730 NETLINK_CB(cb->skb).portid,
731 cb->nlh->nlmsg_seq,
732 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 733 NETCONFA_ALL) < 0)
7a674200
ND		 734 goto done;
735 else
736 h++;
737 }
738done:
739 cb->args[0] = h;
740 cb->args[1] = idx;
741
742 return skb->len;
743}
744
1da177e4
LT		 745#ifdef CONFIG_SYSCTL
746static void dev_forward_change(struct inet6_dev *idev)
747{
748 struct net_device *dev;
749 struct inet6_ifaddr *ifa;
1da177e4
LT		 750
751 if (!idev)
752 return;
753 dev = idev->dev;
0187bdfb
BH		 754 if (idev->cnf.forwarding)
755 dev_disable_lro(dev);
1a940835 756 if (dev->flags & IFF_MULTICAST) {
2c5e8933 757 if (idev->cnf.forwarding) {
f3ee4010 758 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 759 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
760 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
761 } else {
f3ee4010 762 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 763 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
764 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
765 }
1da177e4 766 }
502a2ffd 767
768 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 769 if (ifa->flags&IFA_F_TENTATIVE)
770 continue;
1da177e4
LT		 771 if (idev->cnf.forwarding)
772 addrconf_join_anycast(ifa);
773 else
774 addrconf_leave_anycast(ifa);
775 }
85b3daad
DA		 776 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
777 NETCONFA_FORWARDING,
f3a1bfb1 778 dev->ifindex, &idev->cnf);
1da177e4
LT		 779}
780
781
e186932b 782static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 783{
784 struct net_device *dev;
785 struct inet6_dev *idev;
786
4acd4945 787 for_each_netdev(net, dev) {
1da177e4
LT		 788 idev = __in6_dev_get(dev);
789 if (idev) {
e186932b
PE		 790 int changed = (!idev->cnf.forwarding) ^ (!newf);
791 idev->cnf.forwarding = newf;
1da177e4
LT		 792 if (changed)
793 dev_forward_change(idev);
794 }
1da177e4 795 }
1da177e4 796}
c8fecf22 797
013d97e9 798static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 799{
bff16c2f 800 struct net *net;
013d97e9
FR		 801 int old;
802
803 if (!rtnl_trylock())
804 return restart_syscall();
bff16c2f
PE		 805
806 net = (struct net *)table->extra2;
013d97e9
FR		 807 old = *p;
808 *p = newf;
b325fddb 809
013d97e9 810 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1 811 if ((!newf) ^ (!old))
85b3daad
DA		 812 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
813 NETCONFA_FORWARDING,
f3a1bfb1
ND		 814 NETCONFA_IFINDEX_DEFAULT,
815 net->ipv6.devconf_dflt);
013d97e9
FR		 816 rtnl_unlock();
817 return 0;
88af182e 818 }
c8fecf22 819
e186932b 820 if (p == &net->ipv6.devconf_all->forwarding) {
d26c638c
ND		 821 int old_dflt = net->ipv6.devconf_dflt->forwarding;
822
e186932b 823 net->ipv6.devconf_dflt->forwarding = newf;
d26c638c 824 if ((!newf) ^ (!old_dflt))
85b3daad
DA		 825 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
826 NETCONFA_FORWARDING,
d26c638c
ND		 827 NETCONFA_IFINDEX_DEFAULT,
828 net->ipv6.devconf_dflt);
829
e186932b 830 addrconf_forward_change(net, newf);
f3a1bfb1 831 if ((!newf) ^ (!old))
85b3daad
DA		 832 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
833 NETCONFA_FORWARDING,
f3a1bfb1
ND		 834 NETCONFA_IFINDEX_ALL,
835 net->ipv6.devconf_all);
013d97e9 836 } else if ((!newf) ^ (!old))
c8fecf22 837 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 838 rtnl_unlock();
c8fecf22 839
013d97e9 840 if (newf)
7b4da532 841 rt6_purge_dflt_routers(net);
b325fddb 842 return 1;
c8fecf22 843}
35103d11
AG		 844
845static void addrconf_linkdown_change(struct net *net, __s32 newf)
846{
847 struct net_device *dev;
848 struct inet6_dev *idev;
849
850 for_each_netdev(net, dev) {
851 idev = __in6_dev_get(dev);
852 if (idev) {
853 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
854
855 idev->cnf.ignore_routes_with_linkdown = newf;
856 if (changed)
857 inet6_netconf_notify_devconf(dev_net(dev),
85b3daad 858 RTM_NEWNETCONF,
35103d11
AG		 859 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
860 dev->ifindex,
861 &idev->cnf);
862 }
863 }
864}
865
866static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
867{
868 struct net *net;
869 int old;
870
871 if (!rtnl_trylock())
872 return restart_syscall();
873
874 net = (struct net *)table->extra2;
875 old = *p;
876 *p = newf;
877
878 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
879 if ((!newf) ^ (!old))
880 inet6_netconf_notify_devconf(net,
85b3daad 881 RTM_NEWNETCONF,
35103d11
AG		 882 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
883 NETCONFA_IFINDEX_DEFAULT,
884 net->ipv6.devconf_dflt);
885 rtnl_unlock();
886 return 0;
887 }
888
889 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
890 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
891 addrconf_linkdown_change(net, newf);
892 if ((!newf) ^ (!old))
893 inet6_netconf_notify_devconf(net,
85b3daad 894 RTM_NEWNETCONF,
35103d11
AG		 895 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
896 NETCONFA_IFINDEX_ALL,
897 net->ipv6.devconf_all);
898 }
899 rtnl_unlock();
900
901 return 1;
902}
903
1da177e4
LT		 904#endif
905
5c578aed 906/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 907void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
908{
c2e21293 909 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 910
1da177e4 911#ifdef NET_REFCNT_DEBUG
91df42be 912 pr_debug("%s\n", __func__);
1da177e4
LT		 913#endif
914
915 in6_dev_put(ifp->idev);
916
c15b1cca
HFS		 917 if (cancel_delayed_work(&ifp->dad_work))
918 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
919 ifp);
1da177e4 920
e9d3e084 921 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 922 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 923 return;
924 }
94e187c0 925 ip6_rt_put(ifp->rt);
1da177e4 926
e5785985 927 kfree_rcu(ifp, rcu);
1da177e4
LT		 928}
929
e55ffac6
BH		 930static void
931ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
932{
502a2ffd 933 struct list_head *p;
8a6ce0c0 934 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 935
936 /*
937 * Each device address list is sorted in order of scope -
938 * global before linklocal.
939 */
502a2ffd 940 list_for_each(p, &idev->addr_list) {
941 struct inet6_ifaddr *ifa
942 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 943 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 944 break;
945 }
946
b54c9b98 947 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 948}
949
ddbe5032 950static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 951{
ddbe5032 952 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 953}
954
1da177e4
LT		 955/* On success it returns ifp with increased reference count */
956
957static struct inet6_ifaddr *
3f8f5298
JP		 958ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
959 const struct in6_addr *peer_addr, int pfxlen,
8a226b2c 960 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
1da177e4 961{
df789fe7 962 struct net *net = dev_net(idev->dev);
1da177e4
LT		 963 struct inet6_ifaddr *ifa = NULL;
964 struct rt6_info *rt;
3a88a81d 965 unsigned int hash;
1da177e4 966 int err = 0;
d68b8270
YH		 967 int addr_type = ipv6_addr_type(addr);
968
969 if (addr_type == IPV6_ADDR_ANY ||
970 addr_type & IPV6_ADDR_MULTICAST ||
971 (!(idev->dev->flags & IFF_LOOPBACK) &&
972 addr_type & IPV6_ADDR_LOOPBACK))
973 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 974
8814c4b5 975 rcu_read_lock_bh();
1da177e4
LT		 976 if (idev->dead) {
977 err = -ENODEV; /*XXX*/
978 goto out2;
979 }
980
56d417b1 981 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 982 err = -EACCES;
983 goto out2;
984 }
985
5c578aed 986 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 987
988 /* Ignore adding duplicate addresses on an interface */
c346dca1 989 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ba3542e1 990 ADBG("ipv6_add_addr: already assigned\n");
1da177e4
LT		 991 err = -EEXIST;
992 goto out;
993 }
994
322f74a4 995 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4 996
63159f29 997 if (!ifa) {
ba3542e1 998 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 999 err = -ENOBUFS;
1000 goto out;
1001 }
1002
8f031519 1003 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 1004 if (IS_ERR(rt)) {
1005 err = PTR_ERR(rt);
1006 goto out;
1007 }
1008
df789fe7
DF		 1009 if (net->ipv6.devconf_all->disable_policy ||
1010 idev->cnf.disable_policy)
1011 rt->dst.flags |= DST_NOPOLICY;
1012
bba24896
JP		 1013 neigh_parms_data_state_setall(idev->nd_parms);
1014
4e3fd7a0 1015 ifa->addr = *addr;
3f8f5298
JP		 1016 if (peer_addr)
1017 ifa->peer_addr = *peer_addr;
1da177e4
LT		 1018
1019 spin_lock_init(&ifa->lock);
c15b1cca 1020 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 1021 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 1022 ifa->scope = scope;
1023 ifa->prefix_len = pfxlen;
1024 ifa->flags = flags | IFA_F_TENTATIVE;
8a226b2c
JB		 1025 ifa->valid_lft = valid_lft;
1026 ifa->prefered_lft = prefered_lft;
1da177e4 1027 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 1028 ifa->tokenized = false;
1da177e4 1029
57f5f544
KF		 1030 ifa->rt = rt;
1031
1da177e4
LT		 1032 ifa->idev = idev;
1033 in6_dev_hold(idev);
1034 /* For caller */
1035 in6_ifa_hold(ifa);
1036
1037 /* Add to big hash table */
ddbe5032 1038 hash = inet6_addr_hash(addr);
1da177e4 1039
5c578aed 1040 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 1041 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 1042
1043 write_lock(&idev->lock);
1044 /* Add to inet6_dev unicast addr list. */
e55ffac6 1045 ipv6_link_dev_addr(idev, ifa);
1da177e4 1046
1da177e4 1047 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 1048 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 1049 in6_ifa_hold(ifa);
1050 }
1da177e4 1051
1da177e4
LT		 1052 in6_ifa_hold(ifa);
1053 write_unlock(&idev->lock);
1054out2:
8814c4b5 1055 rcu_read_unlock_bh();
1da177e4 1056
fd92833a 1057 if (likely(err == 0))
f88c91dd 1058 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 1059 else {
1060 kfree(ifa);
1061 ifa = ERR_PTR(err);
1062 }
1063
1064 return ifa;
1065out:
5c578aed 1066 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 1067 goto out2;
1068}
1069
5b84efec
TH		 1070enum cleanup_prefix_rt_t {
1071 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1072 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1073 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1074};
1075
1076/*
1077 * Check, whether the prefix for ifp would still need a prefix route
1078 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1079 * constants.
1080 *
1081 * 1) we don't purge prefix if address was not permanent.
1082 * prefix is managed by its own lifetime.
1083 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1084 * 3) if there are no addresses, delete prefix.
1085 * 4) if there are still other permanent address(es),
1086 * corresponding prefix is still permanent.
1087 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1088 * don't purge the prefix, assume user space is managing it.
1089 * 6) otherwise, update prefix lifetime to the
1090 * longest valid lifetime among the corresponding
1091 * addresses on the device.
1092 * Note: subsequent RA will update lifetime.
1093 **/
1094static enum cleanup_prefix_rt_t
1095check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1096{
1097 struct inet6_ifaddr *ifa;
1098 struct inet6_dev *idev = ifp->idev;
1099 unsigned long lifetime;
1100 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1101
1102 *expires = jiffies;
1103
1104 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1105 if (ifa == ifp)
1106 continue;
1107 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1108 ifp->prefix_len))
1109 continue;
1110 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1111 return CLEANUP_PREFIX_RT_NOP;
1112
1113 action = CLEANUP_PREFIX_RT_EXPIRE;
1114
1115 spin_lock(&ifa->lock);
1116
1117 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1118 /*
1119 * Note: Because this address is
1120 * not permanent, lifetime <
1121 * LONG_MAX / HZ here.
1122 */
1123 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1124 *expires = ifa->tstamp + lifetime * HZ;
1125 spin_unlock(&ifa->lock);
1126 }
1127
1128 return action;
1129}
1130
1131static void
1132cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1133{
1134 struct rt6_info *rt;
1135
1136 rt = addrconf_get_prefix_route(&ifp->addr,
1137 ifp->prefix_len,
1138 ifp->idev->dev,
1139 0, RTF_GATEWAY | RTF_DEFAULT);
1140 if (rt) {
1141 if (del_rt)
1142 ip6_del_rt(rt);
1143 else {
1144 if (!(rt->rt6i_flags & RTF_EXPIRES))
1145 rt6_set_expires(rt, expires);
1146 ip6_rt_put(rt);
1147 }
1148 }
1149}
1150
1151
1da177e4
LT		 1152/* This function wants to get referenced ifp and releases it before return */
1153
1154static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1155{
4c5ff6a6 1156 int state;
5b84efec
TH		 1157 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1158 unsigned long expires;
1da177e4 1159
c15b1cca
HFS		 1160 ASSERT_RTNL();
1161
8e8e676d 1162 spin_lock_bh(&ifp->lock);
4c5ff6a6 1163 state = ifp->state;
e9d3e084 1164 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1165 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1166
1167 if (state == INET6_IFADDR_STATE_DEAD)
1168 goto out;
1da177e4 1169
5c578aed 1170 spin_lock_bh(&addrconf_hash_lock);
1171 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1172 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1173
5b84efec 1174 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1175
1da177e4 1176 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1177 list_del(&ifp->tmp_list);
1178 if (ifp->ifpub) {
1179 in6_ifa_put(ifp->ifpub);
1180 ifp->ifpub = NULL;
1da177e4 1181 }
372e6c8f 1182 __in6_ifa_put(ifp);
1da177e4 1183 }
1da177e4 1184
5b84efec
TH		 1185 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1186 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1187
5b84efec
TH		 1188 list_del_init(&ifp->if_list);
1189 __in6_ifa_put(ifp);
1190
1191 write_unlock_bh(&ifp->idev->lock);
1da177e4 1192
c15b1cca 1193 addrconf_del_dad_work(ifp);
b2238566 1194
1da177e4
LT		 1195 ipv6_ifa_notify(RTM_DELADDR, ifp);
1196
f88c91dd 1197 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1198
5b84efec
TH		 1199 if (action != CLEANUP_PREFIX_RT_NOP) {
1200 cleanup_prefix_route(ifp, expires,
1201 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1202 }
1203
c3968a85
DW		 1204 /* clean up prefsrc entries */
1205 rt6_remove_prefsrc(ifp);
4c5ff6a6 1206out:
1da177e4
LT		 1207 in6_ifa_put(ifp);
1208}
1209
1da177e4
LT		 1210static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1211{
1212 struct inet6_dev *idev = ifp->idev;
1213 struct in6_addr addr, *tmpaddr;
76f793e3 1214 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1215 unsigned long regen_advance;
1da177e4
LT		 1216 int tmp_plen;
1217 int ret = 0;
95c385b4 1218 u32 addr_flags;
76f793e3 1219 unsigned long now = jiffies;
76506a98 1220 long max_desync_factor;
7aa8e63f 1221 s32 cnf_temp_preferred_lft;
1da177e4 1222
53bd6749 1223 write_lock_bh(&idev->lock);
1da177e4
LT		 1224 if (ift) {
1225 spin_lock_bh(&ift->lock);
1226 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1227 spin_unlock_bh(&ift->lock);
1228 tmpaddr = &addr;
1229 } else {
1230 tmpaddr = NULL;
1231 }
1232retry:
1233 in6_dev_hold(idev);
1234 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1235 write_unlock_bh(&idev->lock);
f3213831 1236 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1237 in6_dev_put(idev);
1238 ret = -1;
1239 goto out;
1240 }
1241 spin_lock_bh(&ifp->lock);
1242 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1243 idev->cnf.use_tempaddr = -1; /*XXX*/
1244 spin_unlock_bh(&ifp->lock);
53bd6749 1245 write_unlock_bh(&idev->lock);
f3213831
JP		 1246 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1247 __func__);
1da177e4
LT		 1248 in6_dev_put(idev);
1249 ret = -1;
1250 goto out;
1251 }
1252 in6_ifa_hold(ifp);
1253 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
9d6280da 1254 ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1255 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1256 age = (now - ifp->tstamp) / HZ;
76506a98
JB		 1257
1258 regen_advance = idev->cnf.regen_max_retry *
1259 idev->cnf.dad_transmits *
1260 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1261
1262 /* recalculate max_desync_factor each time and update
1263 * idev->desync_factor if it's larger
1264 */
7aa8e63f 1265 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
76506a98
JB		 1266 max_desync_factor = min_t(__u32,
1267 idev->cnf.max_desync_factor,
7aa8e63f 1268 cnf_temp_preferred_lft - regen_advance);
76506a98
JB		 1269
1270 if (unlikely(idev->desync_factor > max_desync_factor)) {
1271 if (max_desync_factor > 0) {
1272 get_random_bytes(&idev->desync_factor,
1273 sizeof(idev->desync_factor));
1274 idev->desync_factor %= max_desync_factor;
1275 } else {
1276 idev->desync_factor = 0;
1277 }
1278 }
1279
1da177e4
LT		 1280 tmp_valid_lft = min_t(__u32,
1281 ifp->valid_lft,
7a876b0e 1282 idev->cnf.temp_valid_lft + age);
7aa8e63f 1283 tmp_prefered_lft = cnf_temp_preferred_lft + age -
76506a98 1284 idev->desync_factor;
76506a98 1285 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1da177e4 1286 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1287 tmp_tstamp = ifp->tstamp;
1288 spin_unlock_bh(&ifp->lock);
1289
53bd6749 1290 write_unlock_bh(&idev->lock);
95c385b4 1291
eac55bf9
BB		 1292 /* A temporary address is created only if this calculated Preferred
1293 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1294 * an implementation must not create a temporary address with a zero
1295 * Preferred Lifetime.
ecab6701
HK		 1296 * Use age calculation as in addrconf_verify to avoid unnecessary
1297 * temporary addresses being generated.
eac55bf9 1298 */
ecab6701
HK		 1299 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1300 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1301 in6_ifa_put(ifp);
1302 in6_dev_put(idev);
1303 ret = -1;
1304 goto out;
1305 }
1306
95c385b4
NH		 1307 addr_flags = IFA_F_TEMPORARY;
1308 /* set in addrconf_prefix_rcv() */
1309 if (ifp->flags & IFA_F_OPTIMISTIC)
1310 addr_flags |= IFA_F_OPTIMISTIC;
1311
4b08a8f1
HFS		 1312 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1313 ipv6_addr_scope(&addr), addr_flags,
1314 tmp_valid_lft, tmp_prefered_lft);
1315 if (IS_ERR(ift)) {
1da177e4
LT		 1316 in6_ifa_put(ifp);
1317 in6_dev_put(idev);
f3213831 1318 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1319 tmpaddr = &addr;
53bd6749 1320 write_lock_bh(&idev->lock);
1da177e4
LT		 1321 goto retry;
1322 }
1323
1324 spin_lock_bh(&ift->lock);
1325 ift->ifpub = ifp;
76f793e3 1326 ift->cstamp = now;
1da177e4
LT		 1327 ift->tstamp = tmp_tstamp;
1328 spin_unlock_bh(&ift->lock);
1329
cf22f9a2 1330 addrconf_dad_start(ift);
1da177e4
LT		 1331 in6_ifa_put(ift);
1332 in6_dev_put(idev);
1333out:
1334 return ret;
1335}
1da177e4
LT		 1336
1337/*
072047e4 1338 * Choose an appropriate source address (RFC3484)
1da177e4 1339 */
a9b05723
YH		 1340enum {
1341 IPV6_SADDR_RULE_INIT = 0,
1342 IPV6_SADDR_RULE_LOCAL,
1343 IPV6_SADDR_RULE_SCOPE,
1344 IPV6_SADDR_RULE_PREFERRED,
1345#ifdef CONFIG_IPV6_MIP6
1346 IPV6_SADDR_RULE_HOA,
1347#endif
1348 IPV6_SADDR_RULE_OIF,
1349 IPV6_SADDR_RULE_LABEL,
a9b05723 1350 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1351 IPV6_SADDR_RULE_ORCHID,
1352 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1353#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1354 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1355#endif
a9b05723
YH		 1356 IPV6_SADDR_RULE_MAX
1357};
1358
072047e4 1359struct ipv6_saddr_score {
a9b05723
YH		 1360 int rule;
1361 int addr_type;
1362 struct inet6_ifaddr *ifa;
1363 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1364 int scopedist;
1365 int matchlen;
072047e4
YH		 1366};
1367
a9b05723 1368struct ipv6_saddr_dst {
9acd9f3a 1369 const struct in6_addr *addr;
a9b05723
YH		 1370 int ifindex;
1371 int scope;
1372 int label;
7cbca67c 1373 unsigned int prefs;
a9b05723 1374};
072047e4 1375
b6f99a21 1376static inline int ipv6_saddr_preferred(int type)
1da177e4 1377{
45bb0060 1378 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1379 return 1;
1380 return 0;
1da177e4
LT		 1381}
1382
7fd2561e
EK		 1383static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1384{
1385#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1386 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1387#else
1388 return false;
1389#endif
1390}
1391
3de23255
BT		 1392static int ipv6_get_saddr_eval(struct net *net,
1393 struct ipv6_saddr_score *score,
a9b05723
YH		 1394 struct ipv6_saddr_dst *dst,
1395 int i)
1396{
1397 int ret;
1398
1399 if (i <= score->rule) {
1400 switch (i) {
1401 case IPV6_SADDR_RULE_SCOPE:
1402 ret = score->scopedist;
1403 break;
1404 case IPV6_SADDR_RULE_PREFIX:
1405 ret = score->matchlen;
1406 break;
1407 default:
1408 ret = !!test_bit(i, score->scorebits);
1409 }
1410 goto out;
1411 }
1412
1413 switch (i) {
1414 case IPV6_SADDR_RULE_INIT:
1415 /* Rule 0: remember if hiscore is not ready yet */
1416 ret = !!score->ifa;
1417 break;
1418 case IPV6_SADDR_RULE_LOCAL:
1419 /* Rule 1: Prefer same address */
1420 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1421 break;
1422 case IPV6_SADDR_RULE_SCOPE:
1423 /* Rule 2: Prefer appropriate scope
1424 *
1425 * ret
1426 * ^
1427 * -1 | d 15
1428 * ---+--+-+---> scope
1429 * |
1430 * | d is scope of the destination.
1431 * B-d | \
1432 * | \ <- smaller scope is better if
db9c7c39 1433 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1434 * | ret = B - scope (-1 <= scope >= d <= 15).
1435 * d-C-1 | /
1436 * |/ <- greater is better
1437 * -C / if scope is not enough for destination.
1438 * /| ret = scope - C (-1 <= d < scope <= 15).
1439 *
1440 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1441 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1442 * Assume B = 0 and we get C > 29.
1443 */
1444 ret = __ipv6_addr_src_scope(score->addr_type);
1445 if (ret >= dst->scope)
1446 ret = -ret;
1447 else
1448 ret -= 128; /* 30 is enough */
1449 score->scopedist = ret;
1450 break;
1451 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1452 {
a9b05723 1453 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1454 u8 avoid = IFA_F_DEPRECATED;
1455
1456 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1457 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1458 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1459 !(score->ifa->flags & avoid);
a9b05723 1460 break;
7fd2561e 1461 }
a9b05723
YH		 1462#ifdef CONFIG_IPV6_MIP6
1463 case IPV6_SADDR_RULE_HOA:
7cbca67c 1464 {
a9b05723 1465 /* Rule 4: Prefer home address */
7cbca67c
YH		 1466 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1467 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1468 break;
7cbca67c 1469 }
a9b05723
YH		 1470#endif
1471 case IPV6_SADDR_RULE_OIF:
1472 /* Rule 5: Prefer outgoing interface */
1473 ret = (!dst->ifindex ||
1474 dst->ifindex == score->ifa->idev->dev->ifindex);
1475 break;
1476 case IPV6_SADDR_RULE_LABEL:
1477 /* Rule 6: Prefer matching label */
3de23255
BT		 1478 ret = ipv6_addr_label(net,
1479 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1480 score->ifa->idev->dev->ifindex) == dst->label;
1481 break;
a9b05723 1482 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1483 {
a9b05723 1484 /* Rule 7: Prefer public address
25985edc 1485 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1486 */
7cbca67c
YH		 1487 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1488 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1489 score->ifa->idev->cnf.use_tempaddr >= 2;
1490 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1491 break;
7cbca67c 1492 }
a9b05723
YH		 1493 case IPV6_SADDR_RULE_ORCHID:
1494 /* Rule 8-: Prefer ORCHID vs ORCHID or
1495 * non-ORCHID vs non-ORCHID
1496 */
1497 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1498 ipv6_addr_orchid(dst->addr));
1499 break;
1500 case IPV6_SADDR_RULE_PREFIX:
1501 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1502 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1503 if (ret > score->ifa->prefix_len)
1504 ret = score->ifa->prefix_len;
1505 score->matchlen = ret;
a9b05723 1506 break;
7fd2561e
EK		 1507#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1508 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1509 /* Optimistic addresses still have lower precedence than other
1510 * preferred addresses.
1511 */
1512 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1513 break;
1514#endif
a9b05723
YH		 1515 default:
1516 ret = 0;
1517 }
1518
1519 if (ret)
1520 __set_bit(i, score->scorebits);
1521 score->rule = i;
1522out:
1523 return ret;
1524}
1525
c0b8da1e
YH		 1526static int __ipv6_dev_get_saddr(struct net *net,
1527 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1528 struct inet6_dev *idev,
1529 struct ipv6_saddr_score *scores,
1530 int hiscore_idx)
9131f3de 1531{
c0b8da1e 1532 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de
YH		 1533
1534 read_lock_bh(&idev->lock);
1535 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1536 int i;
1537
1538 /*
1539 * - Tentative Address (RFC2462 section 5.4)
1540 * - A tentative address is not considered
1541 * "assigned to an interface" in the traditional
1542 * sense, unless it is also flagged as optimistic.
1543 * - Candidate Source Address (section 4)
1544 * - In any case, anycast addresses, multicast
1545 * addresses, and the unspecified address MUST
1546 * NOT be included in a candidate set.
1547 */
1548 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1549 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1550 continue;
1551
1552 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1553
1554 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1555 score->addr_type & IPV6_ADDR_MULTICAST)) {
1556 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1557 idev->dev->name);
1558 continue;
1559 }
1560
1561 score->rule = -1;
1562 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1563
1564 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1565 int minihiscore, miniscore;
1566
1567 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1568 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1569
1570 if (minihiscore > miniscore) {
1571 if (i == IPV6_SADDR_RULE_SCOPE &&
1572 score->scopedist > 0) {
1573 /*
1574 * special case:
1575 * each remaining entry
1576 * has too small (not enough)
1577 * scope, because ifa entries
1578 * are sorted by their scope
1579 * values.
1580 */
1581 goto out;
1582 }
1583 break;
1584 } else if (minihiscore < miniscore) {
1585 if (hiscore->ifa)
1586 in6_ifa_put(hiscore->ifa);
1587
1588 in6_ifa_hold(score->ifa);
1589
1590 swap(hiscore, score);
c0b8da1e 1591 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1592
1593 /* restore our iterator */
1594 score->ifa = hiscore->ifa;
1595
1596 break;
1597 }
1598 }
1599 }
1600out:
1601 read_unlock_bh(&idev->lock);
c0b8da1e 1602 return hiscore_idx;
9131f3de
YH		 1603}
1604
afbac601
DA		 1605static int ipv6_get_saddr_master(struct net *net,
1606 const struct net_device *dst_dev,
1607 const struct net_device *master,
1608 struct ipv6_saddr_dst *dst,
1609 struct ipv6_saddr_score *scores,
1610 int hiscore_idx)
1611{
1612 struct inet6_dev *idev;
1613
1614 idev = __in6_dev_get(dst_dev);
1615 if (idev)
1616 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1617 scores, hiscore_idx);
1618
1619 idev = __in6_dev_get(master);
1620 if (idev)
1621 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1622 scores, hiscore_idx);
1623
1624 return hiscore_idx;
1625}
1626
b3f644fc 1627int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1628 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1629 struct in6_addr *saddr)
1da177e4 1630{
c0b8da1e 1631 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1632 struct ipv6_saddr_dst dst;
9131f3de 1633 struct inet6_dev *idev;
072047e4 1634 struct net_device *dev;
a9b05723 1635 int dst_type;
9131f3de 1636 bool use_oif_addr = false;
c0b8da1e 1637 int hiscore_idx = 0;
1da177e4 1638
a9b05723
YH		 1639 dst_type = __ipv6_addr_type(daddr);
1640 dst.addr = daddr;
1641 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1642 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1643 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1644 dst.prefs = prefs;
a9b05723 1645
c0b8da1e
YH		 1646 scores[hiscore_idx].rule = -1;
1647 scores[hiscore_idx].ifa = NULL;
1da177e4 1648
8814c4b5 1649 rcu_read_lock();
1da177e4 1650
9131f3de
YH		 1651 /* Candidate Source Address (section 4)
1652 * - multicast and link-local destination address,
1653 * the set of candidate source address MUST only
1654 * include addresses assigned to interfaces
1655 * belonging to the same link as the outgoing
1656 * interface.
1657 * (- For site-local destination addresses, the
1658 * set of candidate source addresses MUST only
1659 * include addresses assigned to interfaces
1660 * belonging to the same site as the outgoing
1661 * interface.)
3985e8a3
EK		 1662 * - "It is RECOMMENDED that the candidate source addresses
1663 * be the set of unicast addresses assigned to the
1664 * interface that will be used to send to the destination
1665 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1666 */
1667 if (dst_dev) {
3985e8a3 1668 idev = __in6_dev_get(dst_dev);
9131f3de 1669 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1670 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1671 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1672 use_oif_addr = true;
1673 }
1674 }
a9b05723 1675
9131f3de 1676 if (use_oif_addr) {
c0b8da1e 1677 if (idev)
c15df306 1678 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de 1679 } else {
afbac601
DA		 1680 const struct net_device *master;
1681 int master_idx = 0;
1682
1683 /* if dst_dev exists and is enslaved to an L3 device, then
1684 * prefer addresses from dst_dev and then the master over
1685 * any other enslaved devices in the L3 domain.
1686 */
1687 master = l3mdev_master_dev_rcu(dst_dev);
1688 if (master) {
1689 master_idx = master->ifindex;
1690
1691 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1692 master, &dst,
1693 scores, hiscore_idx);
1694
1695 if (scores[hiscore_idx].ifa)
1696 goto out;
1697 }
1698
9131f3de 1699 for_each_netdev_rcu(net, dev) {
afbac601
DA		 1700 /* only consider addresses on devices in the
1701 * same L3 domain
1702 */
1703 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1704 continue;
9131f3de
YH		 1705 idev = __in6_dev_get(dev);
1706 if (!idev)
072047e4 1707 continue;
c15df306 1708 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1709 }
1710 }
afbac601
DA		 1711
1712out:
8814c4b5 1713 rcu_read_unlock();
1da177e4 1714
c0b8da1e 1715 hiscore = &scores[hiscore_idx];
a9b05723 1716 if (!hiscore->ifa)
072047e4 1717 return -EADDRNOTAVAIL;
1ab1457c 1718
4e3fd7a0 1719 *saddr = hiscore->ifa->addr;
a9b05723 1720 in6_ifa_put(hiscore->ifa);
072047e4 1721 return 0;
1da177e4 1722}
5e5f3f0f 1723EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1724
8965779d 1725int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1726 u32 banned_flags)
b7b1bfce
HFS		 1727{
1728 struct inet6_ifaddr *ifp;
1729 int err = -EADDRNOTAVAIL;
1730
602582ca
HFS		 1731 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1732 if (ifp->scope > IFA_LINK)
1733 break;
b7b1bfce
HFS		 1734 if (ifp->scope == IFA_LINK &&
1735 !(ifp->flags & banned_flags)) {
1736 *addr = ifp->addr;
1737 err = 0;
1738 break;
1739 }
1740 }
1741 return err;
1742}
1743
95c385b4 1744int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1745 u32 banned_flags)
1da177e4
LT		 1746{
1747 struct inet6_dev *idev;
1748 int err = -EADDRNOTAVAIL;
1749
8814c4b5 1750 rcu_read_lock();
e21e8467
SH		 1751 idev = __in6_dev_get(dev);
1752 if (idev) {
1da177e4 1753 read_lock_bh(&idev->lock);
b7b1bfce 1754 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1755 read_unlock_bh(&idev->lock);
1756 }
8814c4b5 1757 rcu_read_unlock();
1da177e4
LT		 1758 return err;
1759}
1760
1761static int ipv6_count_addresses(struct inet6_dev *idev)
1762{
1763 int cnt = 0;
1764 struct inet6_ifaddr *ifp;
1765
1766 read_lock_bh(&idev->lock);
502a2ffd 1767 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1768 cnt++;
1769 read_unlock_bh(&idev->lock);
1770 return cnt;
1771}
1772
b71d1d42 1773int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1774 const struct net_device *dev, int strict)
c58da4c6
EK		 1775{
1776 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1777}
1778EXPORT_SYMBOL(ipv6_chk_addr);
1779
1780int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1781 const struct net_device *dev, int strict,
1782 u32 banned_flags)
1da177e4 1783{
eedf042a 1784 struct inet6_ifaddr *ifp;
ddbe5032 1785 unsigned int hash = inet6_addr_hash(addr);
c58da4c6 1786 u32 ifp_flags;
1da177e4 1787
5c578aed 1788 rcu_read_lock_bh();
b67bfe0d 1789 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1790 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1791 continue;
c58da4c6
EK		 1792 /* Decouple optimistic from tentative for evaluation here.
1793 * Ban optimistic addresses explicitly, when required.
1794 */
1795 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1796 ? (ifp->flags&~IFA_F_TENTATIVE)
1797 : ifp->flags;
1da177e4 1798 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1799 !(ifp_flags&banned_flags) &&
63159f29 1800 (!dev || ifp->idev->dev == dev ||
eedf042a
SH		 1801 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1802 rcu_read_unlock_bh();
1803 return 1;
1da177e4
LT		 1804 }
1805 }
5c578aed 1806
eedf042a
SH		 1807 rcu_read_unlock_bh();
1808 return 0;
1da177e4 1809}
c58da4c6 1810EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1811
3e81c6da
DM		 1812static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1813 struct net_device *dev)
1da177e4 1814{
ddbe5032 1815 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1816 struct inet6_ifaddr *ifp;
1da177e4 1817
b67bfe0d 1818 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1819 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1820 continue;
1da177e4 1821 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1822 if (!dev || ifp->idev->dev == dev)
3e81c6da 1823 return true;
1da177e4
LT		 1824 }
1825 }
3e81c6da 1826 return false;
1da177e4
LT		 1827}
1828
7df37ff3
CB		 1829/* Compares an address/prefix_len with addresses on device @dev.
1830 * If one is found it returns true.
1831 */
1832bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1833 const unsigned int prefix_len, struct net_device *dev)
1834{
1835 struct inet6_dev *idev;
1836 struct inet6_ifaddr *ifa;
1837 bool ret = false;
1838
1839 rcu_read_lock();
1840 idev = __in6_dev_get(dev);
1841 if (idev) {
1842 read_lock_bh(&idev->lock);
1843 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1844 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1845 if (ret)
1846 break;
1847 }
1848 read_unlock_bh(&idev->lock);
1849 }
1850 rcu_read_unlock();
1851
1852 return ret;
1853}
1854EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1855
b71d1d42 1856int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1857{
1858 struct inet6_dev *idev;
1859 struct inet6_ifaddr *ifa;
1860 int onlink;
1861
1862 onlink = 0;
1863 rcu_read_lock();
1864 idev = __in6_dev_get(dev);
1865 if (idev) {
1866 read_lock_bh(&idev->lock);
502a2ffd 1867 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1868 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1869 ifa->prefix_len);
1870 if (onlink)
1871 break;
1872 }
1873 read_unlock_bh(&idev->lock);
1874 }
1875 rcu_read_unlock();
1876 return onlink;
1877}
52eeeb84
YH		 1878EXPORT_SYMBOL(ipv6_chk_prefix);
1879
9acd9f3a 1880struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1881 struct net_device *dev, int strict)
1da177e4 1882{
b79d1d54 1883 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1884 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1885
5c578aed 1886 rcu_read_lock_bh();
b67bfe0d 1887 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1888 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1889 continue;
1da177e4 1890 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1891 if (!dev || ifp->idev->dev == dev ||
1da177e4 1892 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1893 result = ifp;
1da177e4
LT		 1894 in6_ifa_hold(ifp);
1895 break;
1896 }
1897 }
1898 }
5c578aed 1899 rcu_read_unlock_bh();
1da177e4 1900
b79d1d54 1901 return result;
1da177e4
LT		 1902}
1903
1da177e4
LT		 1904/* Gets referenced address, destroys ifaddr */
1905
cc411d0b 1906static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1907{
3d171f39
LR		 1908 if (dad_failed)
1909 ifp->flags |= IFA_F_DADFAILED;
1910
1da177e4
LT		 1911 if (ifp->flags&IFA_F_PERMANENT) {
1912 spin_lock_bh(&ifp->lock);
c15b1cca 1913 addrconf_del_dad_work(ifp);
1da177e4
LT		 1914 ifp->flags |= IFA_F_TENTATIVE;
1915 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1916 if (dad_failed)
1917 ipv6_ifa_notify(0, ifp);
1da177e4 1918 in6_ifa_put(ifp);
1da177e4
LT		 1919 } else if (ifp->flags&IFA_F_TEMPORARY) {
1920 struct inet6_ifaddr *ifpub;
1921 spin_lock_bh(&ifp->lock);
1922 ifpub = ifp->ifpub;
1923 if (ifpub) {
1924 in6_ifa_hold(ifpub);
1925 spin_unlock_bh(&ifp->lock);
1926 ipv6_create_tempaddr(ifpub, ifp);
1927 in6_ifa_put(ifpub);
1928 } else {
1929 spin_unlock_bh(&ifp->lock);
1930 }
1931 ipv6_del_addr(ifp);
c15b1cca 1932 } else {
1da177e4 1933 ipv6_del_addr(ifp);
c15b1cca 1934 }
1da177e4
LT		 1935}
1936
f2344a13
HX		 1937static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1938{
1939 int err = -ENOENT;
1940
8e8e676d 1941 spin_lock_bh(&ifp->lock);
f2344a13
HX		 1942 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1943 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1944 err = 0;
1945 }
8e8e676d 1946 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 1947
1948 return err;
1949}
1950
3c21edbd
YH		 1951void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1952{
1b34be74 1953 struct inet6_dev *idev = ifp->idev;
1855b7c3 1954 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 1955
853dc2e0
UB		 1956 if (addrconf_dad_end(ifp)) {
1957 in6_ifa_put(ifp);
f2344a13 1958 return;
853dc2e0 1959 }
f2344a13 1960
e87cc472
JP		 1961 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1962 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1963
5f40ef77
HFS		 1964 spin_lock_bh(&ifp->lock);
1965
1966 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1967 int scope = ifp->scope;
1968 u32 flags = ifp->flags;
1969 struct in6_addr new_addr;
1970 struct inet6_ifaddr *ifp2;
1971 u32 valid_lft, preferred_lft;
1972 int pfxlen = ifp->prefix_len;
5f40ef77
HFS		 1973 int retries = ifp->stable_privacy_retry + 1;
1974
1855b7c3 1975 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 1976 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1977 ifp->idev->dev->name);
1978 goto errdad;
1979 }
1980
1981 new_addr = ifp->addr;
1982 if (ipv6_generate_stable_address(&new_addr, retries,
1983 idev))
1984 goto errdad;
1985
1986 valid_lft = ifp->valid_lft;
1987 preferred_lft = ifp->prefered_lft;
1988
1989 spin_unlock_bh(&ifp->lock);
1b34be74 1990
5f40ef77
HFS		 1991 if (idev->cnf.max_addresses &&
1992 ipv6_count_addresses(idev) >=
1993 idev->cnf.max_addresses)
1994 goto lock_errdad;
1995
1996 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1997 ifp->idev->dev->name);
1998
1999 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
2000 scope, flags, valid_lft,
2001 preferred_lft);
2002 if (IS_ERR(ifp2))
2003 goto lock_errdad;
2004
2005 spin_lock_bh(&ifp2->lock);
2006 ifp2->stable_privacy_retry = retries;
2007 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2008 spin_unlock_bh(&ifp2->lock);
2009
1855b7c3 2010 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 2011 in6_ifa_put(ifp2);
2012lock_errdad:
2013 spin_lock_bh(&ifp->lock);
1b34be74
YH		 2014 }
2015
5f40ef77 2016errdad:
c15b1cca
HFS		 2017 /* transition from _POSTDAD to _ERRDAD */
2018 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 2019 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 2020
2021 addrconf_mod_dad_work(ifp, 0);
751eb6b6 2022 in6_ifa_put(ifp);
3c21edbd 2023}
1da177e4 2024
a9ed4a29
SD		 2025/* Join to solicited addr multicast group.
2026 * caller must hold RTNL */
b71d1d42 2027void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 2028{
2029 struct in6_addr maddr;
2030
2031 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2032 return;
2033
2034 addrconf_addr_solict_mult(addr, &maddr);
2035 ipv6_dev_mc_inc(dev, &maddr);
2036}
2037
a9ed4a29 2038/* caller must hold RTNL */
b71d1d42 2039void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 2040{
2041 struct in6_addr maddr;
2042
2043 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2044 return;
2045
2046 addrconf_addr_solict_mult(addr, &maddr);
2047 __ipv6_dev_mc_dec(idev, &maddr);
2048}
2049
a9ed4a29 2050/* caller must hold RTNL */
20380731 2051static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2052{
2053 struct in6_addr addr;
c15b1cca 2054
88ad3149 2055 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 2056 return;
1da177e4
LT		 2057 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2058 if (ipv6_addr_any(&addr))
2059 return;
013b4d90 2060 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 2061}
2062
a9ed4a29 2063/* caller must hold RTNL */
20380731 2064static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2065{
2066 struct in6_addr addr;
c15b1cca 2067
88ad3149 2068 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 2069 return;
1da177e4
LT		 2070 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2071 if (ipv6_addr_any(&addr))
2072 return;
2073 __ipv6_dev_ac_dec(ifp->idev, &addr);
2074}
2075
06a4c1c5 2076static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
2077{
5241c2d7 2078 if (dev->addr_len != EUI64_ADDR_LEN)
06a4c1c5 2079 return -1;
5241c2d7 2080 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
5e98a36e 2081 eui[0] ^= 2;
06a4c1c5 2082 return 0;
2083}
2084
cb6bf355
YH		 2085static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2086{
2087 union fwnet_hwaddr *ha;
2088
2089 if (dev->addr_len != FWNET_ALEN)
2090 return -1;
2091
2092 ha = (union fwnet_hwaddr *)dev->dev_addr;
2093
2094 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2095 eui[0] ^= 2;
2096 return 0;
2097}
2098
073a8e0e
YH		 2099static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2100{
2101 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2102 if (dev->addr_len != ARCNET_ALEN)
2103 return -1;
2104 memset(eui, 0, 7);
8e5e8f30 2105 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 2106 return 0;
2107}
2108
2109static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2110{
2111 if (dev->addr_len != INFINIBAND_ALEN)
2112 return -1;
2113 memcpy(eui, dev->dev_addr + 12, 8);
2114 eui[0] |= 2;
2115 return 0;
2116}
2117
c61393ea 2118static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2119{
9af28511
SH		 2120 if (addr == 0)
2121 return -1;
dfd982ba
YH		 2122 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2123 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2124 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2125 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2126 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2127 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2128 eui[1] = 0;
2129 eui[2] = 0x5E;
2130 eui[3] = 0xFE;
2131 memcpy(eui + 4, &addr, 4);
2132 return 0;
2133}
dfd982ba
YH		 2134
2135static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2136{
2137 if (dev->priv_flags & IFF_ISATAP)
2138 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2139 return -1;
2140}
2141
aee80b54 2142static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2143{
2144 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2145}
2146
e837735e
ND		 2147static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2148{
2149 memcpy(eui, dev->perm_addr, 3);
2150 memcpy(eui + 5, dev->perm_addr + 3, 3);
2151 eui[3] = 0xFF;
2152 eui[4] = 0xFE;
2153 eui[0] ^= 2;
2154 return 0;
2155}
2156
1da177e4
LT		 2157static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2158{
2159 switch (dev->type) {
2160 case ARPHRD_ETHER:
2161 case ARPHRD_FDDI:
073a8e0e 2162 return addrconf_ifid_eui48(eui, dev);
1da177e4 2163 case ARPHRD_ARCNET:
073a8e0e 2164 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2165 case ARPHRD_INFINIBAND:
073a8e0e 2166 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2167 case ARPHRD_SIT:
dfd982ba 2168 return addrconf_ifid_sit(eui, dev);
aee80b54 2169 case ARPHRD_IPGRE:
45ce0fd1 2170 case ARPHRD_TUNNEL:
aee80b54 2171 return addrconf_ifid_gre(eui, dev);
e74bccb8 2172 case ARPHRD_6LOWPAN:
06a4c1c5 2173 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 2174 case ARPHRD_IEEE1394:
2175 return addrconf_ifid_ieee1394(eui, dev);
e837735e 2176 case ARPHRD_TUNNEL6:
45ce0fd1 2177 case ARPHRD_IP6GRE:
e837735e 2178 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2179 }
2180 return -1;
2181}
2182
2183static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2184{
2185 int err = -1;
2186 struct inet6_ifaddr *ifp;
2187
2188 read_lock_bh(&idev->lock);
602582ca
HFS		 2189 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2190 if (ifp->scope > IFA_LINK)
2191 break;
1da177e4
LT		 2192 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2193 memcpy(eui, ifp->addr.s6_addr+8, 8);
2194 err = 0;
2195 break;
2196 }
2197 }
2198 read_unlock_bh(&idev->lock);
2199 return err;
2200}
2201
1da177e4 2202/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
9d6280da 2203static void ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2204{
1da177e4 2205regen:
955189ef 2206 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2207 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2208
2209 /*
2210 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2211 * check if generated address is not inappropriate
2212 *
2213 * - Reserved subnet anycast (RFC 2526)
2214 * 11111101 11....11 1xxxxxxx
c7dc89c0 2215 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2216 * 00-00-5E-FE-xx-xx-xx-xx
2217 * - value 0
2218 * - XXX: already assigned to an address on the device
2219 */
1ab1457c 2220 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2221 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2222 (idev->rndid[7]&0x80))
2223 goto regen;
2224 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2225 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2226 goto regen;
2227 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2228 goto regen;
2229 }
1da177e4
LT		 2230}
2231
9d6280da 2232static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2233{
1da177e4 2234 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
9d6280da 2235 ipv6_regen_rndid(idev);
1da177e4 2236}
1da177e4
LT		 2237
2238/*
2239 * Add prefix route.
2240 */
2241
2242static void
2243addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2244 unsigned long expires, u32 flags)
1da177e4 2245{
86872cb5 2246 struct fib6_config cfg = {
ca254490 2247 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
86872cb5
TG		 2248 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2249 .fc_ifindex = dev->ifindex,
2250 .fc_expires = expires,
2251 .fc_dst_len = plen,
2252 .fc_flags = RTF_UP | flags,
c346dca1 2253 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2254 .fc_protocol = RTPROT_KERNEL,
86872cb5 2255 };
1da177e4 2256
4e3fd7a0 2257 cfg.fc_dst = *pfx;
1da177e4
LT		 2258
2259 /* Prevent useless cloning on PtP SIT.
2260 This thing is done here expecting that the whole
2261 class of non-broadcast devices need not cloning.
2262 */
07a93626 2263#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2264 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2265 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2266#endif
1da177e4 2267
86872cb5 2268 ip6_route_add(&cfg);
1da177e4
LT		 2269}
2270
14ef37b6
AH		 2271
2272static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2273 int plen,
2274 const struct net_device *dev,
2275 u32 flags, u32 noflags)
2276{
2277 struct fib6_node *fn;
2278 struct rt6_info *rt = NULL;
2279 struct fib6_table *table;
ca254490 2280 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2281
ca254490 2282 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2283 if (!table)
14ef37b6
AH		 2284 return NULL;
2285
5744dd9b 2286 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2287 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2288 if (!fn)
2289 goto out;
1f56a01f
MKL		 2290
2291 noflags |= RTF_CACHE;
14ef37b6 2292 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2293 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2294 continue;
2295 if ((rt->rt6i_flags & flags) != flags)
2296 continue;
85da53bf 2297 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2298 continue;
2299 dst_hold(&rt->dst);
2300 break;
2301 }
2302out:
5744dd9b 2303 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2304 return rt;
2305}
2306
2307
1da177e4
LT		 2308/* Create "default" multicast route to the interface */
2309
2310static void addrconf_add_mroute(struct net_device *dev)
2311{
86872cb5 2312 struct fib6_config cfg = {
ca254490 2313 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2314 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2315 .fc_ifindex = dev->ifindex,
2316 .fc_dst_len = 8,
2317 .fc_flags = RTF_UP,
c346dca1 2318 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2319 };
2320
2321 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2322
2323 ip6_route_add(&cfg);
1da177e4
LT		 2324}
2325
1da177e4
LT		 2326static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2327{
2328 struct inet6_dev *idev;
2329
2330 ASSERT_RTNL();
2331
e21e8467
SH		 2332 idev = ipv6_find_idev(dev);
2333 if (!idev)
64e724f6
BH		 2334 return ERR_PTR(-ENOBUFS);
2335
2336 if (idev->cnf.disable_ipv6)
2337 return ERR_PTR(-EACCES);
1da177e4
LT		 2338
2339 /* Add default multicast route */
ba46ee4c 2340 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
4af04aba 2341 addrconf_add_mroute(dev);
1da177e4 2342
1da177e4
LT		 2343 return idev;
2344}
2345
53bd6749
JP		 2346static void manage_tempaddrs(struct inet6_dev *idev,
2347 struct inet6_ifaddr *ifp,
2348 __u32 valid_lft, __u32 prefered_lft,
2349 bool create, unsigned long now)
2350{
2351 u32 flags;
2352 struct inet6_ifaddr *ift;
2353
2354 read_lock_bh(&idev->lock);
2355 /* update all temporary addresses in the list */
2356 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2357 int age, max_valid, max_prefered;
2358
2359 if (ifp != ift->ifpub)
2360 continue;
2361
2362 /* RFC 4941 section 3.3:
2363 * If a received option will extend the lifetime of a public
2364 * address, the lifetimes of temporary addresses should
2365 * be extended, subject to the overall constraint that no
2366 * temporary addresses should ever remain "valid" or "preferred"
2367 * for a time longer than (TEMP_VALID_LIFETIME) or
2368 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2369 */
2370 age = (now - ift->cstamp) / HZ;
2371 max_valid = idev->cnf.temp_valid_lft - age;
2372 if (max_valid < 0)
2373 max_valid = 0;
2374
2375 max_prefered = idev->cnf.temp_prefered_lft -
76506a98 2376 idev->desync_factor - age;
53bd6749
JP		 2377 if (max_prefered < 0)
2378 max_prefered = 0;
2379
2380 if (valid_lft > max_valid)
2381 valid_lft = max_valid;
2382
2383 if (prefered_lft > max_prefered)
2384 prefered_lft = max_prefered;
2385
2386 spin_lock(&ift->lock);
2387 flags = ift->flags;
2388 ift->valid_lft = valid_lft;
2389 ift->prefered_lft = prefered_lft;
2390 ift->tstamp = now;
2391 if (prefered_lft > 0)
2392 ift->flags &= ~IFA_F_DEPRECATED;
2393
2394 spin_unlock(&ift->lock);
2395 if (!(flags&IFA_F_TENTATIVE))
2396 ipv6_ifa_notify(0, ift);
2397 }
2398
2399 if ((create || list_empty(&idev->tempaddr_list)) &&
2400 idev->cnf.use_tempaddr > 0) {
2401 /* When a new public address is created as described
2402 * in [ADDRCONF], also create a new temporary address.
2403 * Also create a temporary address if it's enabled but
2404 * no temporary address currently exists.
2405 */
2406 read_unlock_bh(&idev->lock);
2407 ipv6_create_tempaddr(ifp, NULL);
2408 } else {
2409 read_unlock_bh(&idev->lock);
2410 }
2411}
2412
cc9da6cc
BM		 2413static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2414{
d35a00b8
FJ		 2415 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2416 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc
BM		 2417}
2418
cc84b3c6
AA		 2419int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2420 const struct prefix_info *pinfo,
2421 struct inet6_dev *in6_dev,
2422 const struct in6_addr *addr, int addr_type,
2423 u32 addr_flags, bool sllao, bool tokenized,
2424 __u32 valid_lft, u32 prefered_lft)
4f672235
AA		 2425{
2426 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2427 int create = 0, update_lft = 0;
2428
2429 if (!ifp && valid_lft) {
2430 int max_addresses = in6_dev->cnf.max_addresses;
2431
2432#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2433 if (in6_dev->cnf.optimistic_dad &&
2434 !net->ipv6.devconf_all->forwarding && sllao)
2435 addr_flags |= IFA_F_OPTIMISTIC;
2436#endif
2437
2438 /* Do not allow to create too much of autoconfigured
2439 * addresses; this would be too easy way to crash kernel.
2440 */
2441 if (!max_addresses ||
2442 ipv6_count_addresses(in6_dev) < max_addresses)
2443 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2444 pinfo->prefix_len,
2445 addr_type&IPV6_ADDR_SCOPE_MASK,
2446 addr_flags, valid_lft,
2447 prefered_lft);
2448
2449 if (IS_ERR_OR_NULL(ifp))
2450 return -1;
2451
2452 update_lft = 0;
2453 create = 1;
2454 spin_lock_bh(&ifp->lock);
2455 ifp->flags |= IFA_F_MANAGETEMPADDR;
2456 ifp->cstamp = jiffies;
2457 ifp->tokenized = tokenized;
2458 spin_unlock_bh(&ifp->lock);
2459 addrconf_dad_start(ifp);
2460 }
2461
2462 if (ifp) {
2463 u32 flags;
2464 unsigned long now;
2465 u32 stored_lft;
2466
2467 /* update lifetime (RFC2462 5.5.3 e) */
2468 spin_lock_bh(&ifp->lock);
2469 now = jiffies;
2470 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2471 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2472 else
2473 stored_lft = 0;
2474 if (!update_lft && !create && stored_lft) {
2475 const u32 minimum_lft = min_t(u32,
2476 stored_lft, MIN_VALID_LIFETIME);
2477 valid_lft = max(valid_lft, minimum_lft);
2478
2479 /* RFC4862 Section 5.5.3e:
2480 * "Note that the preferred lifetime of the
2481 * corresponding address is always reset to
2482 * the Preferred Lifetime in the received
2483 * Prefix Information option, regardless of
2484 * whether the valid lifetime is also reset or
2485 * ignored."
2486 *
2487 * So we should always update prefered_lft here.
2488 */
2489 update_lft = 1;
2490 }
2491
2492 if (update_lft) {
2493 ifp->valid_lft = valid_lft;
2494 ifp->prefered_lft = prefered_lft;
2495 ifp->tstamp = now;
2496 flags = ifp->flags;
2497 ifp->flags &= ~IFA_F_DEPRECATED;
2498 spin_unlock_bh(&ifp->lock);
2499
2500 if (!(flags&IFA_F_TENTATIVE))
2501 ipv6_ifa_notify(0, ifp);
2502 } else
2503 spin_unlock_bh(&ifp->lock);
2504
2505 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2506 create, now);
2507
2508 in6_ifa_put(ifp);
2509 addrconf_verify();
2510 }
2511
2512 return 0;
2513}
cc84b3c6 2514EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
4f672235 2515
e6bff995 2516void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2517{
2518 struct prefix_info *pinfo;
2519 __u32 valid_lft;
2520 __u32 prefered_lft;
4f672235 2521 int addr_type, err;
64236f3f 2522 u32 addr_flags = 0;
1da177e4 2523 struct inet6_dev *in6_dev;
56d417b1 2524 struct net *net = dev_net(dev);
1da177e4
LT		 2525
2526 pinfo = (struct prefix_info *) opt;
1ab1457c 2527
1da177e4 2528 if (len < sizeof(struct prefix_info)) {
ba3542e1 2529 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2530 return;
2531 }
1ab1457c 2532
1da177e4
LT		 2533 /*
2534 * Validation checks ([ADDRCONF], page 19)
2535 */
2536
2537 addr_type = ipv6_addr_type(&pinfo->prefix);
2538
2539 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2540 return;
2541
2542 valid_lft = ntohl(pinfo->valid);
2543 prefered_lft = ntohl(pinfo->prefered);
2544
2545 if (prefered_lft > valid_lft) {
e87cc472 2546 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2547 return;
2548 }
2549
2550 in6_dev = in6_dev_get(dev);
2551
63159f29 2552 if (!in6_dev) {
e87cc472
JP		 2553 net_dbg_ratelimited("addrconf: device %s not configured\n",
2554 dev->name);
1da177e4
LT		 2555 return;
2556 }
2557
2558 /*
2559 * Two things going on here:
2560 * 1) Add routes for on-link prefixes
2561 * 2) Configure prefixes with the auto flag set
2562 */
2563
4bed72e4
YH		 2564 if (pinfo->onlink) {
2565 struct rt6_info *rt;
2566 unsigned long rt_expires;
2567
6f704992
YH		 2568 /* Avoid arithmetic overflow. Really, we could
2569 * save rt_expires in seconds, likely valid_lft,
2570 * but it would require division in fib gc, that it
2571 * not good.
2572 */
4bed72e4
YH		 2573 if (HZ > USER_HZ)
2574 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2575 else
2576 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2577
4bed72e4
YH		 2578 if (addrconf_finite_timeout(rt_expires))
2579 rt_expires *= HZ;
1da177e4 2580
14ef37b6
AH		 2581 rt = addrconf_get_prefix_route(&pinfo->prefix,
2582 pinfo->prefix_len,
2583 dev,
2584 RTF_ADDRCONF | RTF_PREFIX_RT,
2585 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2586
14ef37b6 2587 if (rt) {
6f704992
YH		 2588 /* Autoconf prefix route */
2589 if (valid_lft == 0) {
2590 ip6_del_rt(rt);
2591 rt = NULL;
4bed72e4 2592 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2593 /* not infinity */
1716a961 2594 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2595 } else {
1716a961 2596 rt6_clean_expires(rt);
1da177e4
LT		 2597 }
2598 } else if (valid_lft) {
6f704992 2599 clock_t expires = 0;
4bed72e4
YH		 2600 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2601 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2602 /* not infinity */
2603 flags |= RTF_EXPIRES;
2604 expires = jiffies_to_clock_t(rt_expires);
2605 }
1da177e4 2606 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2607 dev, expires, flags);
1da177e4 2608 }
94e187c0 2609 ip6_rt_put(rt);
1da177e4
LT		 2610 }
2611
2612 /* Try to figure out our local address for this prefix */
2613
2614 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1da177e4 2615 struct in6_addr addr;
f997c55c 2616 bool tokenized = false, dev_addr_generated = false;
1da177e4
LT		 2617
2618 if (pinfo->prefix_len == 64) {
2619 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2620
2621 if (!ipv6_addr_any(&in6_dev->token)) {
2622 read_lock_bh(&in6_dev->lock);
2623 memcpy(addr.s6_addr + 8,
2624 in6_dev->token.s6_addr + 8, 8);
2625 read_unlock_bh(&in6_dev->lock);
617fe29d 2626 tokenized = true;
cc9da6cc 2627 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2628 !ipv6_generate_stable_address(&addr, 0,
2629 in6_dev)) {
64236f3f 2630 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2631 goto ok;
f53adae4
DB		 2632 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2633 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
4f672235 2634 goto put;
f997c55c
AA		 2635 } else {
2636 dev_addr_generated = true;
1da177e4
LT		 2637 }
2638 goto ok;
2639 }
e87cc472
JP		 2640 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2641 pinfo->prefix_len);
4f672235 2642 goto put;
1da177e4
LT		 2643
2644ok:
4f672235
AA		 2645 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2646 &addr, addr_type,
2647 addr_flags, sllao,
2648 tokenized, valid_lft,
2649 prefered_lft);
2650 if (err)
2651 goto put;
f997c55c
AA		 2652
2653 /* Ignore error case here because previous prefix add addr was
2654 * successful which will be notified.
2655 */
2656 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2657 addr_type, addr_flags, sllao,
2658 tokenized, valid_lft,
2659 prefered_lft,
2660 dev_addr_generated);
1da177e4
LT		 2661 }
2662 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
4f672235 2663put:
1da177e4
LT		 2664 in6_dev_put(in6_dev);
2665}
2666
2667/*
2668 * Set destination address.
2669 * Special case for SIT interfaces where we create a new "virtual"
2670 * device.
2671 */
af284937 2672int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2673{
2674 struct in6_ifreq ireq;
2675 struct net_device *dev;
2676 int err = -EINVAL;
2677
2678 rtnl_lock();
2679
2680 err = -EFAULT;
2681 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2682 goto err_exit;
2683
af284937 2684 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2685
2686 err = -ENODEV;
63159f29 2687 if (!dev)
1da177e4
LT		 2688 goto err_exit;
2689
07a93626 2690#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2691 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2692 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2693 struct ifreq ifr;
1da177e4
LT		 2694 struct ip_tunnel_parm p;
2695
2696 err = -EADDRNOTAVAIL;
2697 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2698 goto err_exit;
2699
2700 memset(&p, 0, sizeof(p));
2701 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2702 p.iph.saddr = 0;
2703 p.iph.version = 4;
2704 p.iph.ihl = 5;
2705 p.iph.protocol = IPPROTO_IPV6;
2706 p.iph.ttl = 64;
d20b3109 2707 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2708
5bc3eb7e
SH		 2709 if (ops->ndo_do_ioctl) {
2710 mm_segment_t oldfs = get_fs();
2711
2712 set_fs(KERNEL_DS);
2713 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2714 set_fs(oldfs);
2715 } else
2716 err = -EOPNOTSUPP;
1da177e4
LT		 2717
2718 if (err == 0) {
2719 err = -ENOBUFS;
af284937
DL		 2720 dev = __dev_get_by_name(net, p.name);
2721 if (!dev)
1da177e4
LT		 2722 goto err_exit;
2723 err = dev_open(dev);
2724 }
2725 }
0be669bb 2726#endif
1da177e4
LT		 2727
2728err_exit:
2729 rtnl_unlock();
2730 return err;
2731}
2732
93a714d6
MC		 2733static int ipv6_mc_config(struct sock *sk, bool join,
2734 const struct in6_addr *addr, int ifindex)
2735{
2736 int ret;
2737
2738 ASSERT_RTNL();
2739
2740 lock_sock(sk);
2741 if (join)
54ff9ef3 2742 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2743 else
54ff9ef3 2744 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2745 release_sock(sk);
2746
2747 return ret;
2748}
2749
1da177e4
LT		 2750/*
2751 * Manual configuration of address on an interface
2752 */
479840ff
JP		 2753static int inet6_addr_add(struct net *net, int ifindex,
2754 const struct in6_addr *pfx,
caeaba79 2755 const struct in6_addr *peer_pfx,
479840ff
JP		 2756 unsigned int plen, __u32 ifa_flags,
2757 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2758{
2759 struct inet6_ifaddr *ifp;
2760 struct inet6_dev *idev;
2761 struct net_device *dev;
93a714d6
MC		 2762 unsigned long timeout;
2763 clock_t expires;
1da177e4 2764 int scope;
6f704992 2765 u32 flags;
1da177e4
LT		 2766
2767 ASSERT_RTNL();
1ab1457c 2768
24ef0da7
TG		 2769 if (plen > 128)
2770 return -EINVAL;
2771
0778769d
NT		 2772 /* check the lifetime */
2773 if (!valid_lft || prefered_lft > valid_lft)
2774 return -EINVAL;
2775
53bd6749
JP		 2776 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2777 return -EINVAL;
2778
af284937
DL		 2779 dev = __dev_get_by_index(net, ifindex);
2780 if (!dev)
1da177e4 2781 return -ENODEV;
1ab1457c 2782
64e724f6
BH		 2783 idev = addrconf_add_dev(dev);
2784 if (IS_ERR(idev))
2785 return PTR_ERR(idev);
1da177e4 2786
93a714d6
MC		 2787 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2788 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2789 true, pfx, ifindex);
2790
2791 if (ret < 0)
2792 return ret;
2793 }
2794
1da177e4
LT		 2795 scope = ipv6_addr_scope(pfx);
2796
4bed72e4
YH		 2797 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2798 if (addrconf_finite_timeout(timeout)) {
2799 expires = jiffies_to_clock_t(timeout * HZ);
2800 valid_lft = timeout;
6f704992 2801 flags = RTF_EXPIRES;
4bed72e4
YH		 2802 } else {
2803 expires = 0;
2804 flags = 0;
2805 ifa_flags |= IFA_F_PERMANENT;
6f704992 2806 }
0778769d 2807
4bed72e4
YH		 2808 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2809 if (addrconf_finite_timeout(timeout)) {
2810 if (timeout == 0)
2811 ifa_flags |= IFA_F_DEPRECATED;
2812 prefered_lft = timeout;
2813 }
0778769d 2814
8a226b2c
JB		 2815 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2816 valid_lft, prefered_lft);
0778769d 2817
1da177e4 2818 if (!IS_ERR(ifp)) {
761aac73
TH		 2819 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2820 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2821 expires, flags);
2822 }
2823
95c385b4
NH		 2824 /*
2825 * Note that section 3.1 of RFC 4429 indicates
2826 * that the Optimistic flag should not be set for
2827 * manually configured addresses
2828 */
cf22f9a2 2829 addrconf_dad_start(ifp);
53bd6749
JP		 2830 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2831 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2832 true, jiffies);
1da177e4 2833 in6_ifa_put(ifp);
c15b1cca 2834 addrconf_verify_rtnl();
1da177e4 2835 return 0;
93a714d6
MC		 2836 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2837 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2838 false, pfx, ifindex);
1da177e4
LT		 2839 }
2840
2841 return PTR_ERR(ifp);
2842}
2843
6046d5b4
HK		 2844static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2845 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2846{
2847 struct inet6_ifaddr *ifp;
2848 struct inet6_dev *idev;
2849 struct net_device *dev;
1ab1457c 2850
24ef0da7
TG		 2851 if (plen > 128)
2852 return -EINVAL;
2853
af284937
DL		 2854 dev = __dev_get_by_index(net, ifindex);
2855 if (!dev)
1da177e4
LT		 2856 return -ENODEV;
2857
e5d08d71 2858 idev = __in6_dev_get(dev);
63159f29 2859 if (!idev)
1da177e4
LT		 2860 return -ENXIO;
2861
2862 read_lock_bh(&idev->lock);
502a2ffd 2863 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2864 if (ifp->prefix_len == plen &&
2865 ipv6_addr_equal(pfx, &ifp->addr)) {
2866 in6_ifa_hold(ifp);
2867 read_unlock_bh(&idev->lock);
1ab1457c 2868
6046d5b4
HK		 2869 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2870 (ifa_flags & IFA_F_MANAGETEMPADDR))
2871 manage_tempaddrs(idev, ifp, 0, 0, false,
2872 jiffies);
1da177e4 2873 ipv6_del_addr(ifp);
6046d5b4 2874 addrconf_verify_rtnl();
93a714d6
MC		 2875 if (ipv6_addr_is_multicast(pfx)) {
2876 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2877 false, pfx, dev->ifindex);
2878 }
1da177e4
LT		 2879 return 0;
2880 }
2881 }
2882 read_unlock_bh(&idev->lock);
2883 return -EADDRNOTAVAIL;
2884}
2885
2886
af284937 2887int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2888{
2889 struct in6_ifreq ireq;
2890 int err;
1ab1457c 2891
af31f412 2892 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2893 return -EPERM;
1ab1457c 2894
1da177e4
LT		 2895 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2896 return -EFAULT;
2897
2898 rtnl_lock();
caeaba79 2899 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2900 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2901 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2902 rtnl_unlock();
2903 return err;
2904}
2905
af284937 2906int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2907{
2908 struct in6_ifreq ireq;
2909 int err;
1ab1457c 2910
af31f412 2911 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2912 return -EPERM;
2913
2914 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2915 return -EFAULT;
2916
2917 rtnl_lock();
6046d5b4 2918 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2919 ireq.ifr6_prefixlen);
1da177e4
LT		 2920 rtnl_unlock();
2921 return err;
2922}
2923
b5f348e5
IJ		 2924static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2925 int plen, int scope)
2926{
2927 struct inet6_ifaddr *ifp;
2928
8a226b2c 2929 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2930 scope, IFA_F_PERMANENT,
2931 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2932 if (!IS_ERR(ifp)) {
2933 spin_lock_bh(&ifp->lock);
2934 ifp->flags &= ~IFA_F_TENTATIVE;
2935 spin_unlock_bh(&ifp->lock);
764d3be6 2936 rt_genid_bump_ipv6(dev_net(idev->dev));
b5f348e5
IJ		 2937 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2938 in6_ifa_put(ifp);
2939 }
2940}
2941
07a93626 2942#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2943static void sit_add_v4_addrs(struct inet6_dev *idev)
2944{
1da177e4
LT		 2945 struct in6_addr addr;
2946 struct net_device *dev;
c346dca1 2947 struct net *net = dev_net(idev->dev);
929c9cf3 2948 int scope, plen;
f0e2acfa 2949 u32 pflags = 0;
1da177e4
LT		 2950
2951 ASSERT_RTNL();
2952
2953 memset(&addr, 0, sizeof(struct in6_addr));
2954 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2955
2956 if (idev->dev->flags&IFF_POINTOPOINT) {
2957 addr.s6_addr32[0] = htonl(0xfe800000);
2958 scope = IFA_LINK;
929c9cf3 2959 plen = 64;
1da177e4
LT		 2960 } else {
2961 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2962 plen = 96;
f0e2acfa 2963 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2964 }
2965
2966 if (addr.s6_addr32[3]) {
929c9cf3 2967 add_addr(idev, &addr, plen, scope);
f0e2acfa 2968 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2969 return;
2970 }
2971
6fda7350 2972 for_each_netdev(net, dev) {
8e5e8f30 2973 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2974 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2975 struct in_ifaddr *ifa;
1da177e4
LT		 2976
2977 int flag = scope;
2978
2979 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2980
2981 addr.s6_addr32[3] = ifa->ifa_local;
2982
2983 if (ifa->ifa_scope == RT_SCOPE_LINK)
2984 continue;
2985 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2986 if (idev->dev->flags&IFF_POINTOPOINT)
2987 continue;
2988 flag |= IFA_HOST;
2989 }
1da177e4 2990
b5f348e5 2991 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2992 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2993 pflags);
1da177e4
LT		 2994 }
2995 }
1ab1457c 2996 }
1da177e4 2997}
0be669bb 2998#endif
1da177e4
LT		 2999
3000static void init_loopback(struct net_device *dev)
3001{
3002 struct inet6_dev *idev;
25fb6ca4
BK		 3003 struct net_device *sp_dev;
3004 struct inet6_ifaddr *sp_ifa;
3005 struct rt6_info *sp_rt;
1da177e4
LT		 3006
3007 /* ::1 */
3008
3009 ASSERT_RTNL();
3010
e5d08d71 3011 idev = ipv6_find_idev(dev);
63159f29 3012 if (!idev) {
91df42be 3013 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3014 return;
3015 }
3016
b5f348e5 3017 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 3018
3019 /* Add routes to other interface's IPv6 addresses */
3020 for_each_netdev(dev_net(dev), sp_dev) {
3021 if (!strcmp(sp_dev->name, dev->name))
3022 continue;
3023
3024 idev = __in6_dev_get(sp_dev);
3025 if (!idev)
3026 continue;
3027
3028 read_lock_bh(&idev->lock);
3029 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
3030
3031 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
3032 continue;
3033
33d99113
G		 3034 if (sp_ifa->rt) {
3035 /* This dst has been added to garbage list when
3036 * lo device down, release this obsolete dst and
3037 * reallocate a new router for ifa.
3038 */
a220445f 3039 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
33d99113
G		 3040 ip6_rt_put(sp_ifa->rt);
3041 sp_ifa->rt = NULL;
3042 } else {
3043 continue;
3044 }
3045 }
a881ae1f 3046
57ec0afe 3047 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 3048
3049 /* Failure cases are ignored */
534c8779
G		 3050 if (!IS_ERR(sp_rt)) {
3051 sp_ifa->rt = sp_rt;
25fb6ca4 3052 ip6_ins_rt(sp_rt);
534c8779 3053 }
25fb6ca4
BK		 3054 }
3055 read_unlock_bh(&idev->lock);
3056 }
1da177e4
LT		 3057}
3058
2ad3ed59
AA		 3059void addrconf_add_linklocal(struct inet6_dev *idev,
3060 const struct in6_addr *addr, u32 flags)
1da177e4 3061{
8e5e8f30 3062 struct inet6_ifaddr *ifp;
64236f3f 3063 u32 addr_flags = flags | IFA_F_PERMANENT;
95c385b4
NH		 3064
3065#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3066 if (idev->cnf.optimistic_dad &&
702beb87 3067 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 3068 addr_flags |= IFA_F_OPTIMISTIC;
3069#endif
1da177e4 3070
07edd741
HFS		 3071 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3072 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 3073 if (!IS_ERR(ifp)) {
46d48046 3074 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 3075 addrconf_dad_start(ifp);
1da177e4
LT		 3076 in6_ifa_put(ifp);
3077 }
3078}
2ad3ed59 3079EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
1da177e4 3080
622c81d5
HFS		 3081static bool ipv6_reserved_interfaceid(struct in6_addr address)
3082{
3083 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3084 return true;
3085
3086 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3087 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3088 return true;
3089
3090 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3091 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3092 return true;
3093
3094 return false;
3095}
3096
3097static int ipv6_generate_stable_address(struct in6_addr *address,
3098 u8 dad_count,
3099 const struct inet6_dev *idev)
3100{
622c81d5
HFS		 3101 static DEFINE_SPINLOCK(lock);
3102 static __u32 digest[SHA_DIGEST_WORDS];
3103 static __u32 workspace[SHA_WORKSPACE_WORDS];
3104
3105 static union {
3106 char __data[SHA_MESSAGE_BYTES];
3107 struct {
3108 struct in6_addr secret;
ff40217e 3109 __be32 prefix[2];
622c81d5
HFS		 3110 unsigned char hwaddr[MAX_ADDR_LEN];
3111 u8 dad_count;
3112 } __packed;
3113 } data;
3114
3115 struct in6_addr secret;
3116 struct in6_addr temp;
3117 struct net *net = dev_net(idev->dev);
3118
3119 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3120
3121 if (idev->cnf.stable_secret.initialized)
3122 secret = idev->cnf.stable_secret.secret;
3123 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3124 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3125 else
3126 return -1;
3127
3128retry:
3129 spin_lock_bh(&lock);
3130
3131 sha_init(digest);
3132 memset(&data, 0, sizeof(data));
3133 memset(workspace, 0, sizeof(workspace));
3134 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3135 data.prefix[0] = address->s6_addr32[0];
3136 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3137 data.secret = secret;
3138 data.dad_count = dad_count;
3139
3140 sha_transform(digest, data.__data, workspace);
3141
3142 temp = *address;
ff40217e
HFS		 3143 temp.s6_addr32[2] = (__force __be32)digest[0];
3144 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3145
3146 spin_unlock_bh(&lock);
3147
3148 if (ipv6_reserved_interfaceid(temp)) {
3149 dad_count++;
1855b7c3 3150 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3151 return -1;
3152 goto retry;
3153 }
3154
3155 *address = temp;
3156 return 0;
3157}
3158
cc9da6cc
BM		 3159static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3160{
3161 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3162
3163 if (s->initialized)
3164 return;
3165 s = &idev->cnf.stable_secret;
3166 get_random_bytes(&s->secret, sizeof(s->secret));
3167 s->initialized = true;
3168}
3169
bc91b0f0
JP		 3170static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3171{
622c81d5
HFS		 3172 struct in6_addr addr;
3173
ca254490
DA		 3174 /* no link local addresses on L3 master devices */
3175 if (netif_is_l3_master(idev->dev))
3176 return;
3177
622c81d5 3178 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3179
d35a00b8 3180 switch (idev->cnf.addr_gen_mode) {
cc9da6cc
BM		 3181 case IN6_ADDR_GEN_MODE_RANDOM:
3182 ipv6_gen_mode_random_init(idev);
3183 /* fallthrough */
3184 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3185 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3186 addrconf_add_linklocal(idev, &addr,
3187 IFA_F_STABLE_PRIVACY);
622c81d5
HFS		 3188 else if (prefix_route)
3189 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3190 break;
3191 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3192 /* addrconf_add_linklocal also adds a prefix_route and we
3193 * only need to care about prefix routes if ipv6_generate_eui64
3194 * couldn't generate one.
3195 */
3196 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3197 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0
JP		 3198 else if (prefix_route)
3199 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3200 break;
3201 case IN6_ADDR_GEN_MODE_NONE:
3202 default:
3203 /* will not add any link local address */
3204 break;
bc91b0f0
JP		 3205 }
3206}
3207
1da177e4
LT		 3208static void addrconf_dev_config(struct net_device *dev)
3209{
8e5e8f30 3210 struct inet6_dev *idev;
1da177e4
LT		 3211
3212 ASSERT_RTNL();
3213
74235a25
HX		 3214 if ((dev->type != ARPHRD_ETHER) &&
3215 (dev->type != ARPHRD_FDDI) &&
74235a25 3216 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3217 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3218 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3219 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc 3220 (dev->type != ARPHRD_6LOWPAN) &&
45ce0fd1
FJ		 3221 (dev->type != ARPHRD_IP6GRE) &&
3222 (dev->type != ARPHRD_IPGRE) &&
3223 (dev->type != ARPHRD_TUNNEL) &&
cc9da6cc 3224 (dev->type != ARPHRD_NONE)) {
74235a25
HX		 3225 /* Alas, we support only Ethernet autoconfiguration. */
3226 return;
3227 }
3228
1da177e4 3229 idev = addrconf_add_dev(dev);
64e724f6 3230 if (IS_ERR(idev))
1da177e4
LT		 3231 return;
3232
cc9da6cc
BM		 3233 /* this device type has no EUI support */
3234 if (dev->type == ARPHRD_NONE &&
d35a00b8
FJ		 3235 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3236 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc 3237
bc91b0f0 3238 addrconf_addr_gen(idev, false);
1da177e4
LT		 3239}
3240
07a93626 3241#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3242static void addrconf_sit_config(struct net_device *dev)
3243{
3244 struct inet6_dev *idev;
3245
3246 ASSERT_RTNL();
3247
1ab1457c
YH		 3248 /*
3249 * Configure the tunnel with one of our IPv4
3250 * addresses... we should configure all of
1da177e4
LT		 3251 * our v4 addrs in the tunnel
3252 */
3253
e5d08d71 3254 idev = ipv6_find_idev(dev);
63159f29 3255 if (!idev) {
91df42be 3256 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3257 return;
3258 }
3259
c7dc89c0 3260 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3261 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3262 return;
3263 }
3264
1da177e4
LT		 3265 sit_add_v4_addrs(idev);
3266
62b54dd9 3267 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3268 addrconf_add_mroute(dev);
1da177e4 3269}
0be669bb 3270#endif
1da177e4 3271
07a93626 3272#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3273static void addrconf_gre_config(struct net_device *dev)
3274{
3275 struct inet6_dev *idev;
aee80b54 3276
aee80b54 3277 ASSERT_RTNL();
3278
e5d08d71 3279 idev = ipv6_find_idev(dev);
63159f29 3280 if (!idev) {
91df42be 3281 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3282 return;
3283 }
3284
bc91b0f0 3285 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3286 if (dev->flags & IFF_POINTOPOINT)
3287 addrconf_add_mroute(dev);
aee80b54 3288}
3289#endif
3290
f1705ec1
DA		 3291static int fixup_permanent_addr(struct inet6_dev *idev,
3292 struct inet6_ifaddr *ifp)
3293{
3294 if (!ifp->rt) {
3295 struct rt6_info *rt;
3296
3297 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3298 if (unlikely(IS_ERR(rt)))
3299 return PTR_ERR(rt);
3300
3301 ifp->rt = rt;
3302 }
3303
3304 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3305 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3306 idev->dev, 0, 0);
3307 }
3308
3309 addrconf_dad_start(ifp);
3310
3311 return 0;
3312}
3313
3314static void addrconf_permanent_addr(struct net_device *dev)
3315{
3316 struct inet6_ifaddr *ifp, *tmp;
3317 struct inet6_dev *idev;
3318
3319 idev = __in6_dev_get(dev);
3320 if (!idev)
3321 return;
3322
3323 write_lock_bh(&idev->lock);
3324
3325 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3326 if ((ifp->flags & IFA_F_PERMANENT) &&
3327 fixup_permanent_addr(idev, ifp) < 0) {
3328 write_unlock_bh(&idev->lock);
3329 ipv6_del_addr(ifp);
3330 write_lock_bh(&idev->lock);
3331
3332 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3333 idev->dev->name, &ifp->addr);
3334 }
3335 }
3336
3337 write_unlock_bh(&idev->lock);
3338}
3339
1ab1457c 3340static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3341 void *ptr)
1da177e4 3342{
351638e7 3343 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4f7f34ea 3344 struct netdev_notifier_changeupper_info *info;
748e2d93 3345 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 3346 int run_pending = 0;
b217d616 3347 int err;
1da177e4 3348
e21e8467 3349 switch (event) {
45ba9dd2 3350 case NETDEV_REGISTER:
74235a25 3351 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3352 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3353 if (IS_ERR(idev))
3354 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3355 }
3356 break;
bcdd553f 3357
b7b0b1d2
AD		 3358 case NETDEV_CHANGEMTU:
3359 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3360 if (dev->mtu < IPV6_MIN_MTU) {
3361 addrconf_ifdown(dev, 1);
3362 break;
3363 }
3364
3365 if (idev) {
3366 rt6_mtu_change(dev, dev->mtu);
3367 idev->cnf.mtu6 = dev->mtu;
3368 break;
3369 }
3370
3371 /* allocate new idev */
3372 idev = ipv6_add_dev(dev);
3373 if (IS_ERR(idev))
3374 break;
3375
3376 /* device is still not ready */
3377 if (!(idev->if_flags & IF_READY))
3378 break;
3379
3380 run_pending = 1;
3381
3382 /* fall through */
3383
1da177e4 3384 case NETDEV_UP:
3c21edbd 3385 case NETDEV_CHANGE:
c2edacf8
JV		 3386 if (dev->flags & IFF_SLAVE)
3387 break;
3388
3ce62a84
WC		 3389 if (idev && idev->cnf.disable_ipv6)
3390 break;
3391
3c21edbd 3392 if (event == NETDEV_UP) {
38bd10c4
DA		 3393 /* restore routes for permanent addresses */
3394 addrconf_permanent_addr(dev);
3395
f24e3d65 3396 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 3397 /* device is not ready yet. */
f3213831 3398 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3399 dev->name);
3400 break;
3401 }
99081049 3402
d31c7b8f
EP		 3403 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3404 idev = ipv6_add_dev(dev);
3405
a317a2f1 3406 if (!IS_ERR_OR_NULL(idev)) {
99081049 3407 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3408 run_pending = 1;
3409 }
b7b0b1d2 3410 } else if (event == NETDEV_CHANGE) {
f24e3d65 3411 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 3412 /* device is still not ready. */
3413 break;
3414 }
3415
3416 if (idev) {
a088d1d7
LL		 3417 if (idev->if_flags & IF_READY) {
3418 /* device is already configured -
3419 * but resend MLD reports, we might
3420 * have roamed and need to update
3421 * multicast snooping switches
3422 */
3423 ipv6_mc_up(idev);
3c21edbd 3424 break;
a088d1d7 3425 }
3c21edbd
YH		 3426 idev->if_flags |= IF_READY;
3427 }
3428
f3213831
JP		 3429 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3430 dev->name);
3c21edbd 3431
c5e33bdd 3432 run_pending = 1;
3c21edbd
YH		 3433 }
3434
e21e8467 3435 switch (dev->type) {
07a93626 3436#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3437 case ARPHRD_SIT:
3438 addrconf_sit_config(dev);
3439 break;
aee80b54 3440#endif
07a93626 3441#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3442 case ARPHRD_IPGRE:
3443 addrconf_gre_config(dev);
3444 break;
0be669bb 3445#endif
1da177e4
LT		 3446 case ARPHRD_LOOPBACK:
3447 init_loopback(dev);
3448 break;
3449
3450 default:
3451 addrconf_dev_config(dev);
3452 break;
3ff50b79 3453 }
bcdd553f 3454
a317a2f1 3455 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3456 if (run_pending)
3457 addrconf_dad_run(idev);
3458
bcdd553f
SH		 3459 /*
3460 * If the MTU changed during the interface down,
3461 * when the interface up, the changed MTU must be
3462 * reflected in the idev as well as routers.
1da177e4 3463 */
bcdd553f
SH		 3464 if (idev->cnf.mtu6 != dev->mtu &&
3465 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3466 rt6_mtu_change(dev, dev->mtu);
3467 idev->cnf.mtu6 = dev->mtu;
3468 }
3469 idev->tstamp = jiffies;
3470 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3471
3472 /*
3473 * If the changed mtu during down is lower than
3474 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3475 */
3476 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 3477 addrconf_ifdown(dev, 1);
1da177e4
LT		 3478 }
3479 break;
3480
1da177e4
LT		 3481 case NETDEV_DOWN:
3482 case NETDEV_UNREGISTER:
3483 /*
3484 * Remove all addresses from this interface.
3485 */
3486 addrconf_ifdown(dev, event != NETDEV_DOWN);
3487 break;
3c21edbd 3488
1da177e4 3489 case NETDEV_CHANGENAME:
1da177e4 3490 if (idev) {
5632c515 3491 snmp6_unregister_dev(idev);
408c4768 3492 addrconf_sysctl_unregister(idev);
a317a2f1 3493 err = addrconf_sysctl_register(idev);
b217d616
HX		 3494 if (err)
3495 return notifier_from_errno(err);
a317a2f1
WC		 3496 err = snmp6_register_dev(idev);
3497 if (err) {
3498 addrconf_sysctl_unregister(idev);
3499 return notifier_from_errno(err);
3500 }
5632c515 3501 }
1da177e4 3502 break;
bcdd553f 3503
93d9b7d7
JP		 3504 case NETDEV_PRE_TYPE_CHANGE:
3505 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3506 if (idev)
3507 addrconf_type_change(dev, event);
75c78500 3508 break;
4f7f34ea
DA		 3509
3510 case NETDEV_CHANGEUPPER:
3511 info = ptr;
3512
3513 /* flush all routes if dev is linked to or unlinked from
3514 * an L3 master device (e.g., VRF)
3515 */
3516 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3517 addrconf_ifdown(dev, 0);
3ff50b79 3518 }
1da177e4
LT		 3519
3520 return NOTIFY_OK;
3521}
3522
3523/*
3524 * addrconf module should be notified of a device going up
3525 */
3526static struct notifier_block ipv6_dev_notf = {
3527 .notifier_call = addrconf_notify,
1da177e4
LT		 3528};
3529
93d9b7d7 3530static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3531{
3532 struct inet6_dev *idev;
3533 ASSERT_RTNL();
3534
3535 idev = __in6_dev_get(dev);
3536
93d9b7d7 3537 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3538 ipv6_mc_remap(idev);
93d9b7d7 3539 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3540 ipv6_mc_unmap(idev);
3541}
3542
70af921d
DA		 3543static bool addr_is_local(const struct in6_addr *addr)
3544{
3545 return ipv6_addr_type(addr) &
3546 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3547}
3548
1da177e4
LT		 3549static int addrconf_ifdown(struct net_device *dev, int how)
3550{
c346dca1 3551 struct net *net = dev_net(dev);
502a2ffd 3552 struct inet6_dev *idev;
f1705ec1
DA		 3553 struct inet6_ifaddr *ifa, *tmp;
3554 struct list_head del_list;
3555 int _keep_addr;
3556 bool keep_addr;
73a8bd74 3557 int state, i;
1da177e4
LT		 3558
3559 ASSERT_RTNL();
3560
73a8bd74
DM		 3561 rt6_ifdown(net, dev);
3562 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3563
3564 idev = __in6_dev_get(dev);
63159f29 3565 if (!idev)
1da177e4
LT		 3566 return -ENODEV;
3567
bcdd553f
SH		 3568 /*
3569 * Step 1: remove reference to ipv6 device from parent device.
3570 * Do not dev_put!
1da177e4 3571 */
439e2385 3572 if (how) {
1da177e4 3573 idev->dead = 1;
8814c4b5
YH		 3574
3575 /* protected by rtnl_lock */
a9b3cd7f 3576 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3577
3578 /* Step 1.5: remove snmp6 entry */
3579 snmp6_unregister_dev(idev);
3580
3581 }
3582
f1705ec1
DA		 3583 /* aggregate the system setting and interface setting */
3584 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3585 if (!_keep_addr)
3586 _keep_addr = idev->cnf.keep_addr_on_down;
3587
3588 /* combine the user config with event to determine if permanent
3589 * addresses are to be removed from address hash table
3590 */
bc561632 3591 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
f1705ec1 3592
73a8bd74
DM		 3593 /* Step 2: clear hash table */
3594 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3595 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3596
3597 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3598restart:
b67bfe0d 3599 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3600 if (ifa->idev == idev) {
c15b1cca 3601 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3602 /* combined flag + permanent flag decide if
3603 * address is retained on a down event
3604 */
3605 if (!keep_addr ||
70af921d
DA		 3606 !(ifa->flags & IFA_F_PERMANENT) ||
3607 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3608 hlist_del_init_rcu(&ifa->addr_lst);
3609 goto restart;
3610 }
73a8bd74
DM		 3611 }
3612 }
3613 spin_unlock_bh(&addrconf_hash_lock);
3614 }
3615
1da177e4
LT		 3616 write_lock_bh(&idev->lock);
3617
b7b1bfce
HFS		 3618 addrconf_del_rs_timer(idev);
3619
bcdd553f 3620 /* Step 2: clear flags for stateless addrconf */
439e2385 3621 if (!how)
3c21edbd 3622 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3623
bcdd553f 3624 /* Step 3: clear tempaddr list */
372e6c8f 3625 while (!list_empty(&idev->tempaddr_list)) {
3626 ifa = list_first_entry(&idev->tempaddr_list,
3627 struct inet6_ifaddr, tmp_list);
3628 list_del(&ifa->tmp_list);
1da177e4
LT		 3629 write_unlock_bh(&idev->lock);
3630 spin_lock_bh(&ifa->lock);
3631
3632 if (ifa->ifpub) {
3633 in6_ifa_put(ifa->ifpub);
3634 ifa->ifpub = NULL;
3635 }
3636 spin_unlock_bh(&ifa->lock);
3637 in6_ifa_put(ifa);
3638 write_lock_bh(&idev->lock);
3639 }
8f37ada5 3640
f1705ec1
DA		 3641 /* re-combine the user config with event to determine if permanent
3642 * addresses are to be removed from the interface list
3643 */
bc561632 3644 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
84e8b803 3645
f1705ec1
DA		 3646 INIT_LIST_HEAD(&del_list);
3647 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
38bd10c4
DA		 3648 struct rt6_info *rt = NULL;
3649
f1705ec1 3650 addrconf_del_dad_work(ifa);
84e8b803 3651
73a8bd74 3652 write_unlock_bh(&idev->lock);
8e8e676d 3653 spin_lock_bh(&ifa->lock);
f1705ec1 3654
70af921d
DA		 3655 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3656 !addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3657 /* set state to skip the notifier below */
3658 state = INET6_IFADDR_STATE_DEAD;
3659 ifa->state = 0;
3660 if (!(ifa->flags & IFA_F_NODAD))
3661 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3662
3663 rt = ifa->rt;
3664 ifa->rt = NULL;
f1705ec1
DA		 3665 } else {
3666 state = ifa->state;
3667 ifa->state = INET6_IFADDR_STATE_DEAD;
3668
c882219a 3669 list_move(&ifa->if_list, &del_list);
f1705ec1
DA		 3670 }
3671
8e8e676d 3672 spin_unlock_bh(&ifa->lock);
9d82ca98 3673
38bd10c4
DA		 3674 if (rt)
3675 ip6_del_rt(rt);
3676
73a8bd74
DM		 3677 if (state != INET6_IFADDR_STATE_DEAD) {
3678 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3679 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
ea06f717
MM		 3680 } else {
3681 if (idev->cnf.forwarding)
3682 addrconf_leave_anycast(ifa);
3683 addrconf_leave_solict(ifa->idev, &ifa->addr);
27bdb2ab 3684 }
8f37ada5 3685
73a8bd74
DM		 3686 write_lock_bh(&idev->lock);
3687 }
8f37ada5 3688
1da177e4
LT		 3689 write_unlock_bh(&idev->lock);
3690
f1705ec1
DA		 3691 /* now clean up addresses to be removed */
3692 while (!list_empty(&del_list)) {
3693 ifa = list_first_entry(&del_list,
3694 struct inet6_ifaddr, if_list);
3695 list_del(&ifa->if_list);
3696
3697 in6_ifa_put(ifa);
3698 }
3699
381f4dca
SD		 3700 /* Step 5: Discard anycast and multicast list */
3701 if (how) {
3702 ipv6_ac_destroy_dev(idev);
1da177e4 3703 ipv6_mc_destroy_dev(idev);
381f4dca 3704 } else {
1da177e4 3705 ipv6_mc_down(idev);
381f4dca 3706 }
1da177e4 3707
1da177e4 3708 idev->tstamp = jiffies;
1ab1457c 3709
bcdd553f 3710 /* Last: Shot the device (if unregistered) */
439e2385 3711 if (how) {
408c4768 3712 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3713 neigh_parms_release(&nd_tbl, idev->nd_parms);
3714 neigh_ifdown(&nd_tbl, dev);
3715 in6_dev_put(idev);
3716 }
3717 return 0;
3718}
3719
3720static void addrconf_rs_timer(unsigned long data)
3721{
b7b1bfce 3722 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3723 struct net_device *dev = idev->dev;
b7b1bfce 3724 struct in6_addr lladdr;
1da177e4 3725
b7b1bfce 3726 write_lock(&idev->lock);
5b2a1953 3727 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3728 goto out;
3729
9ba2add3 3730 if (!ipv6_accept_ra(idev))
5b2a1953 3731 goto out;
3732
3733 /* Announcement received after solicitation was sent */
3734 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3735 goto out;
1da177e4 3736
bd11f074 3737 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
caf92bc4
CW		 3738 write_unlock(&idev->lock);
3739 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3740 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3741 &in6addr_linklocal_allrouters);
3742 else
caf92bc4 3743 goto put;
1da177e4 3744
caf92bc4 3745 write_lock(&idev->lock);
bd11f074
MŻ		 3746 idev->rs_interval = rfc3315_s14_backoff_update(
3747 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
b7b1bfce
HFS		 3748 /* The wait after the last probe can be shorter */
3749 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3750 idev->cnf.rtr_solicits) ?
3751 idev->cnf.rtr_solicit_delay :
bd11f074 3752 idev->rs_interval);
1da177e4 3753 } else {
1da177e4
LT		 3754 /*
3755 * Note: we do not support deprecated "all on-link"
3756 * assumption any longer.
3757 */
91df42be 3758 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3759 }
3760
3761out:
b7b1bfce 3762 write_unlock(&idev->lock);
caf92bc4 3763put:
b7b1bfce 3764 in6_dev_put(idev);
1da177e4
LT		 3765}
3766
3767/*
3768 * Duplicate Address Detection
3769 */
3c21edbd
YH		 3770static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3771{
3772 unsigned long rand_num;
3773 struct inet6_dev *idev = ifp->idev;
adc176c5 3774 u64 nonce;
3c21edbd 3775
95c385b4
NH		 3776 if (ifp->flags & IFA_F_OPTIMISTIC)
3777 rand_num = 0;
3778 else
63862b5b 3779 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3780
adc176c5
EN		 3781 nonce = 0;
3782 if (idev->cnf.enhanced_dad ||
3783 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3784 do
3785 get_random_bytes(&nonce, 6);
3786 while (nonce == 0);
3787 }
3788 ifp->dad_nonce = nonce;
b7b1bfce 3789 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3790 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3791}
3792
c15b1cca 3793static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3794{
3795 struct inet6_dev *idev = ifp->idev;
3796 struct net_device *dev = idev->dev;
764d3be6 3797 bool bump_id, notify = false;
1da177e4
LT		 3798
3799 addrconf_join_solict(dev, &ifp->addr);
3800
63862b5b 3801 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3802
3803 read_lock_bh(&idev->lock);
622ccdf1 3804 spin_lock(&ifp->lock);
e9d3e084 3805 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3806 goto out;
1da177e4
LT		 3807
3808 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3809 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3810 !(ifp->flags&IFA_F_TENTATIVE) ||
3811 ifp->flags & IFA_F_NODAD) {
764d3be6 3812 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3813 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3814 spin_unlock(&ifp->lock);
1da177e4
LT		 3815 read_unlock_bh(&idev->lock);
3816
764d3be6 3817 addrconf_dad_completed(ifp, bump_id);
1da177e4
LT		 3818 return;
3819 }
3820
6732bade 3821 if (!(idev->if_flags & IF_READY)) {
21809faf 3822 spin_unlock(&ifp->lock);
6732bade 3823 read_unlock_bh(&idev->lock);
3c21edbd 3824 /*
590a9887 3825 * If the device is not ready:
3c21edbd
YH		 3826 * - keep it tentative if it is a permanent address.
3827 * - otherwise, kill it.
3828 */
3829 in6_ifa_hold(ifp);
cc411d0b 3830 addrconf_dad_stop(ifp, 0);
6732bade 3831 return;
3c21edbd 3832 }
95c385b4
NH		 3833
3834 /*
3835 * Optimistic nodes can start receiving
3836 * Frames right away
3837 */
7fd2561e 3838 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3839 ip6_ins_rt(ifp->rt);
7fd2561e
EK		 3840 if (ipv6_use_optimistic_addr(idev)) {
3841 /* Because optimistic nodes can use this address,
3842 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3843 */
16186a82 3844 notify = true;
7fd2561e
EK		 3845 }
3846 }
95c385b4 3847
6732bade 3848 addrconf_dad_kick(ifp);
1da177e4 3849out:
622ccdf1 3850 spin_unlock(&ifp->lock);
1da177e4 3851 read_unlock_bh(&idev->lock);
16186a82
SAK		 3852 if (notify)
3853 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 3854}
3855
c15b1cca 3856static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3857{
c15b1cca
HFS		 3858 bool begin_dad = false;
3859
8e8e676d 3860 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3861 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3862 ifp->state = INET6_IFADDR_STATE_PREDAD;
3863 begin_dad = true;
3864 }
8e8e676d 3865 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3866
3867 if (begin_dad)
3868 addrconf_mod_dad_work(ifp, 0);
3869}
3870
3871static void addrconf_dad_work(struct work_struct *w)
3872{
3873 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3874 struct inet6_ifaddr,
3875 dad_work);
1da177e4 3876 struct inet6_dev *idev = ifp->idev;
764d3be6 3877 bool bump_id, disable_ipv6 = false;
1da177e4
LT		 3878 struct in6_addr mcaddr;
3879
c15b1cca
HFS		 3880 enum {
3881 DAD_PROCESS,
3882 DAD_BEGIN,
3883 DAD_ABORT,
3884 } action = DAD_PROCESS;
3885
3886 rtnl_lock();
3887
8e8e676d 3888 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3889 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3890 action = DAD_BEGIN;
3891 ifp->state = INET6_IFADDR_STATE_DAD;
3892 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3893 action = DAD_ABORT;
3894 ifp->state = INET6_IFADDR_STATE_POSTDAD;
85b51b12
MM		 3895
3896 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3897 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3898 struct in6_addr addr;
3899
3900 addr.s6_addr32[0] = htonl(0xfe800000);
3901 addr.s6_addr32[1] = 0;
3902
3903 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3904 ipv6_addr_equal(&ifp->addr, &addr)) {
3905 /* DAD failed for link-local based on MAC */
3906 idev->cnf.disable_ipv6 = 1;
3907
3908 pr_info("%s: IPv6 being disabled!\n",
3909 ifp->idev->dev->name);
3910 disable_ipv6 = true;
3911 }
3912 }
c15b1cca 3913 }
8e8e676d 3914 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3915
3916 if (action == DAD_BEGIN) {
3917 addrconf_dad_begin(ifp);
3918 goto out;
3919 } else if (action == DAD_ABORT) {
751eb6b6 3920 in6_ifa_hold(ifp);
c15b1cca 3921 addrconf_dad_stop(ifp, 1);
85b51b12
MM		 3922 if (disable_ipv6)
3923 addrconf_ifdown(idev->dev, 0);
c15b1cca
HFS		 3924 goto out;
3925 }
3926
b7b1bfce 3927 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3928 goto out;
3929
c15b1cca 3930 write_lock_bh(&idev->lock);
122e4519 3931 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3932 write_unlock_bh(&idev->lock);
1da177e4
LT		 3933 goto out;
3934 }
21809faf 3935
3936 spin_lock(&ifp->lock);
622ccdf1
HX		 3937 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3938 spin_unlock(&ifp->lock);
c15b1cca 3939 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3940 goto out;
3941 }
3942
b7b1bfce 3943 if (ifp->dad_probes == 0) {
1da177e4
LT		 3944 /*
3945 * DAD was successful
3946 */
3947
764d3be6 3948 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3949 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3950 spin_unlock(&ifp->lock);
c15b1cca 3951 write_unlock_bh(&idev->lock);
1da177e4 3952
764d3be6 3953 addrconf_dad_completed(ifp, bump_id);
1da177e4
LT		 3954
3955 goto out;
3956 }
3957
b7b1bfce 3958 ifp->dad_probes--;
c15b1cca
HFS		 3959 addrconf_mod_dad_work(ifp,
3960 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3961 spin_unlock(&ifp->lock);
c15b1cca 3962 write_unlock_bh(&idev->lock);
1da177e4
LT		 3963
3964 /* send a neighbour solicitation for our addr */
1da177e4 3965 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
adc176c5
EN		 3966 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
3967 ifp->dad_nonce);
1da177e4
LT		 3968out:
3969 in6_ifa_put(ifp);
c15b1cca 3970 rtnl_unlock();
1da177e4
LT		 3971}
3972
11ffff75
HFS		 3973/* ifp->idev must be at least read locked */
3974static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3975{
3976 struct inet6_ifaddr *ifpiter;
3977 struct inet6_dev *idev = ifp->idev;
3978
602582ca
HFS		 3979 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3980 if (ifpiter->scope > IFA_LINK)
3981 break;
11ffff75
HFS		 3982 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3983 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3984 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3985 IFA_F_PERMANENT)
3986 return false;
3987 }
3988 return true;
3989}
3990
764d3be6 3991static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id)
1da177e4 3992{
e21e8467 3993 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3994 struct in6_addr lladdr;
b173ee48 3995 bool send_rs, send_mld;
b7b1bfce 3996
c15b1cca 3997 addrconf_del_dad_work(ifp);
1da177e4
LT		 3998
3999 /*
4000 * Configure the address for reception. Now it is valid.
4001 */
4002
4003 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4004
026359bc
TA		 4005 /* If added prefix is link local and we are prepared to process
4006 router advertisements, start sending router solicitations.
1da177e4
LT		 4007 */
4008
1ec047eb 4009 read_lock_bh(&ifp->idev->lock);
11ffff75 4010 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 4011 send_rs = send_mld &&
4012 ipv6_accept_ra(ifp->idev) &&
bd11f074 4013 ifp->idev->cnf.rtr_solicits != 0 &&
b173ee48 4014 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 4015 read_unlock_bh(&ifp->idev->lock);
4016
b173ee48
HFS		 4017 /* While dad is in progress mld report's source address is in6_addrany.
4018 * Resend with proper ll now.
4019 */
4020 if (send_mld)
4021 ipv6_mc_dad_complete(ifp->idev);
4022
1ec047eb 4023 if (send_rs) {
1da177e4
LT		 4024 /*
4025 * If a host as already performed a random delay
4026 * [...] as part of DAD [...] there is no need
4027 * to delay again before sending the first RS
4028 */
1ec047eb 4029 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 4030 return;
1ec047eb 4031 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 4032
b7b1bfce
HFS		 4033 write_lock_bh(&ifp->idev->lock);
4034 spin_lock(&ifp->lock);
bd11f074
MŻ		 4035 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4036 ifp->idev->cnf.rtr_solicit_interval);
b7b1bfce 4037 ifp->idev->rs_probes = 1;
1da177e4 4038 ifp->idev->if_flags |= IF_RS_SENT;
bd11f074 4039 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
b7b1bfce
HFS		 4040 spin_unlock(&ifp->lock);
4041 write_unlock_bh(&ifp->idev->lock);
1da177e4 4042 }
764d3be6
PA		 4043
4044 if (bump_id)
4045 rt_genid_bump_ipv6(dev_net(dev));
a11a7f71
MH		 4046
4047 /* Make sure that a new temporary address will be created
4048 * before this temporary address becomes deprecated.
4049 */
4050 if (ifp->flags & IFA_F_TEMPORARY)
4051 addrconf_verify_rtnl();
1da177e4
LT		 4052}
4053
e21e8467
SH		 4054static void addrconf_dad_run(struct inet6_dev *idev)
4055{
c5e33bdd
YH		 4056 struct inet6_ifaddr *ifp;
4057
4058 read_lock_bh(&idev->lock);
502a2ffd 4059 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 4060 spin_lock(&ifp->lock);
f2344a13
HX		 4061 if (ifp->flags & IFA_F_TENTATIVE &&
4062 ifp->state == INET6_IFADDR_STATE_DAD)
4063 addrconf_dad_kick(ifp);
21809faf 4064 spin_unlock(&ifp->lock);
c5e33bdd
YH		 4065 }
4066 read_unlock_bh(&idev->lock);
4067}
4068
1da177e4
LT		 4069#ifdef CONFIG_PROC_FS
4070struct if6_iter_state {
3c40090a 4071 struct seq_net_private p;
1da177e4 4072 int bucket;
1d578303 4073 int offset;
1da177e4
LT		 4074};
4075
1d578303 4076static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 4077{
4078 struct inet6_ifaddr *ifa = NULL;
4079 struct if6_iter_state *state = seq->private;
1218854a 4080 struct net *net = seq_file_net(seq);
1d578303 4081 int p = 0;
1da177e4 4082
1d578303
MM		 4083 /* initial bucket if pos is 0 */
4084 if (pos == 0) {
4085 state->bucket = 0;
4086 state->offset = 0;
4087 }
4088
4089 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 4090 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 4091 addr_lst) {
9f0d3c27
ED		 4092 if (!net_eq(dev_net(ifa->idev->dev), net))
4093 continue;
1d578303
MM		 4094 /* sync with offset */
4095 if (p < state->offset) {
4096 p++;
4097 continue;
4098 }
4099 state->offset++;
9f0d3c27 4100 return ifa;
1d578303
MM		 4101 }
4102
4103 /* prepare for next bucket */
4104 state->offset = 0;
4105 p = 0;
1da177e4 4106 }
c2e21293 4107 return NULL;
1da177e4
LT		 4108}
4109
c2e21293 4110static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4111 struct inet6_ifaddr *ifa)
1da177e4
LT		 4112{
4113 struct if6_iter_state *state = seq->private;
1218854a 4114 struct net *net = seq_file_net(seq);
1da177e4 4115
b67bfe0d 4116 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 4117 if (!net_eq(dev_net(ifa->idev->dev), net))
4118 continue;
1d578303 4119 state->offset++;
9f0d3c27 4120 return ifa;
1d578303 4121 }
3c40090a 4122
c2e21293 4123 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 4124 state->offset = 0;
b67bfe0d 4125 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 4126 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 4127 if (!net_eq(dev_net(ifa->idev->dev), net))
4128 continue;
1d578303 4129 state->offset++;
9f0d3c27 4130 return ifa;
c2e21293 4131 }
1da177e4 4132 }
3c40090a 4133
c2e21293 4134 return NULL;
1da177e4
LT		 4135}
4136
1da177e4 4137static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 4138 __acquires(rcu_bh)
1da177e4 4139{
5c578aed 4140 rcu_read_lock_bh();
1d578303 4141 return if6_get_first(seq, *pos);
1da177e4
LT		 4142}
4143
4144static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4145{
4146 struct inet6_ifaddr *ifa;
4147
4148 ifa = if6_get_next(seq, v);
4149 ++*pos;
4150 return ifa;
4151}
4152
4153static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 4154 __releases(rcu_bh)
1da177e4 4155{
5c578aed 4156 rcu_read_unlock_bh();
1da177e4
LT		 4157}
4158
4159static int if6_seq_show(struct seq_file *seq, void *v)
4160{
4161 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4162 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4163 &ifp->addr,
1da177e4
LT		 4164 ifp->idev->dev->ifindex,
4165 ifp->prefix_len,
4166 ifp->scope,
971a351c 4167 (u8) ifp->flags,
1da177e4
LT		 4168 ifp->idev->dev->name);
4169 return 0;
4170}
4171
56b3d975 4172static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4173 .start = if6_seq_start,
4174 .next = if6_seq_next,
4175 .show = if6_seq_show,
4176 .stop = if6_seq_stop,
4177};
4178
4179static int if6_seq_open(struct inode *inode, struct file *file)
4180{
3c40090a
DL		 4181 return seq_open_net(inode, file, &if6_seq_ops,
4182 sizeof(struct if6_iter_state));
1da177e4
LT		 4183}
4184
9a32144e 4185static const struct file_operations if6_fops = {
1da177e4
LT		 4186 .owner = THIS_MODULE,
4187 .open = if6_seq_open,
4188 .read = seq_read,
4189 .llseek = seq_lseek,
3c40090a 4190 .release = seq_release_net,
1da177e4
LT		 4191};
4192
2c8c1e72 4193static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4194{
d4beaa66 4195 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 4196 return -ENOMEM;
4197 return 0;
4198}
4199
2c8c1e72 4200static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4201{
ece31ffd 4202 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4203}
4204
4205static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4206 .init = if6_proc_net_init,
4207 .exit = if6_proc_net_exit,
3c40090a
DL		 4208};
4209
4210int __init if6_proc_init(void)
4211{
4212 return register_pernet_subsys(&if6_proc_net_ops);
4213}
4214
1da177e4
LT		 4215void if6_proc_exit(void)
4216{
3c40090a 4217 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4218}
4219#endif /* CONFIG_PROC_FS */
4220
07a93626 4221#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4222/* Check if address is a home address configured on any interface. */
b71d1d42 4223int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 4224{
4225 int ret = 0;
c2e21293 4226 struct inet6_ifaddr *ifp = NULL;
ddbe5032 4227 unsigned int hash = inet6_addr_hash(addr);
c2e21293 4228
5c578aed 4229 rcu_read_lock_bh();
b67bfe0d 4230 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 4231 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 4232 continue;
caad295f 4233 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4234 (ifp->flags & IFA_F_HOMEADDRESS)) {
4235 ret = 1;
4236 break;
4237 }
4238 }
5c578aed 4239 rcu_read_unlock_bh();
3b9f9a1c
NT		 4240 return ret;
4241}
4242#endif
4243
1da177e4
LT		 4244/*
4245 * Periodic address status verification
4246 */
4247
c15b1cca 4248static void addrconf_verify_rtnl(void)
1da177e4 4249{
b2db7564 4250 unsigned long now, next, next_sec, next_sched;
1da177e4 4251 struct inet6_ifaddr *ifp;
1da177e4
LT		 4252 int i;
4253
c15b1cca
HFS		 4254 ASSERT_RTNL();
4255
5c578aed 4256 rcu_read_lock_bh();
1da177e4 4257 now = jiffies;
b2db7564 4258 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4259
c15b1cca 4260 cancel_delayed_work(&addr_chk_work);
1da177e4 4261
bcdd553f 4262 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4263restart:
c15b1cca 4264 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 4265 unsigned long age;
1da177e4 4266
fad8da3e
YA		 4267 /* When setting preferred_lft to a value not zero or
4268 * infinity, while valid_lft is infinity
4269 * IFA_F_PERMANENT has a non-infinity life time.
4270 */
4271 if ((ifp->flags & IFA_F_PERMANENT) &&
4272 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4273 continue;
4274
4275 spin_lock(&ifp->lock);
b2db7564
YH		 4276 /* We try to batch several events at once. */
4277 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4278
8f27ebb9
YH		 4279 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4280 age >= ifp->valid_lft) {
1da177e4
LT		 4281 spin_unlock(&ifp->lock);
4282 in6_ifa_hold(ifp);
1da177e4
LT		 4283 ipv6_del_addr(ifp);
4284 goto restart;
8f27ebb9
YH		 4285 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4286 spin_unlock(&ifp->lock);
4287 continue;
1da177e4 4288 } else if (age >= ifp->prefered_lft) {
a1ed0526 4289 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4290 int deprecate = 0;
4291
4292 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4293 deprecate = 1;
4294 ifp->flags |= IFA_F_DEPRECATED;
4295 }
4296
fad8da3e
YA		 4297 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4298 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4299 next = ifp->tstamp + ifp->valid_lft * HZ;
4300
4301 spin_unlock(&ifp->lock);
4302
4303 if (deprecate) {
4304 in6_ifa_hold(ifp);
1da177e4
LT		 4305
4306 ipv6_ifa_notify(0, ifp);
4307 in6_ifa_put(ifp);
4308 goto restart;
4309 }
1da177e4
LT		 4310 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4311 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4312 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4313 ifp->idev->cnf.dad_transmits *
1f9248e5 4314 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 4315
1da177e4
LT		 4316 if (age >= ifp->prefered_lft - regen_advance) {
4317 struct inet6_ifaddr *ifpub = ifp->ifpub;
4318 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4319 next = ifp->tstamp + ifp->prefered_lft * HZ;
4320 if (!ifp->regen_count && ifpub) {
4321 ifp->regen_count++;
4322 in6_ifa_hold(ifp);
4323 in6_ifa_hold(ifpub);
4324 spin_unlock(&ifp->lock);
5c578aed 4325
291d809b
HY		 4326 spin_lock(&ifpub->lock);
4327 ifpub->regen_count = 0;
4328 spin_unlock(&ifpub->lock);
1da177e4
LT		 4329 ipv6_create_tempaddr(ifpub, ifp);
4330 in6_ifa_put(ifpub);
4331 in6_ifa_put(ifp);
4332 goto restart;
4333 }
4334 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4335 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4336 spin_unlock(&ifp->lock);
1da177e4
LT		 4337 } else {
4338 /* ifp->prefered_lft <= ifp->valid_lft */
4339 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4340 next = ifp->tstamp + ifp->prefered_lft * HZ;
4341 spin_unlock(&ifp->lock);
4342 }
4343 }
1da177e4
LT		 4344 }
4345
b2db7564
YH		 4346 next_sec = round_jiffies_up(next);
4347 next_sched = next;
4348
4349 /* If rounded timeout is accurate enough, accept it. */
4350 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4351 next_sched = next_sec;
4352
4353 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4354 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4355 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4356
ba3542e1 4357 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4358 now, next, next_sec, next_sched);
c15b1cca 4359 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4360 rcu_read_unlock_bh();
1da177e4
LT		 4361}
4362
c15b1cca
HFS		 4363static void addrconf_verify_work(struct work_struct *w)
4364{
4365 rtnl_lock();
4366 addrconf_verify_rtnl();
4367 rtnl_unlock();
4368}
4369
4370static void addrconf_verify(void)
4371{
4372 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4373}
4374
caeaba79
ND		 4375static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4376 struct in6_addr **peer_pfx)
461d8837
TG		 4377{
4378 struct in6_addr *pfx = NULL;
4379
caeaba79
ND		 4380 *peer_pfx = NULL;
4381
461d8837
TG		 4382 if (addr)
4383 pfx = nla_data(addr);
4384
4385 if (local) {
4386 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4387 *peer_pfx = pfx;
4388 pfx = nla_data(local);
461d8837
TG		 4389 }
4390
4391 return pfx;
4392}
4393
ef7c79ed 4394static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4395 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4396 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4397 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4398 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 4399};
4400
1da177e4 4401static int
661d2967 4402inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4403{
3b1e0a65 4404 struct net *net = sock_net(skb->sk);
b933f716
TG		 4405 struct ifaddrmsg *ifm;
4406 struct nlattr *tb[IFA_MAX+1];
caeaba79 4407 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4408 u32 ifa_flags;
b933f716 4409 int err;
1da177e4 4410
b933f716
TG		 4411 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4412 if (err < 0)
4413 return err;
4414
4415 ifm = nlmsg_data(nlh);
caeaba79 4416 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4417 if (!pfx)
1da177e4
LT		 4418 return -EINVAL;
4419
6046d5b4
HK		 4420 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4421
4422 /* We ignore other flags so far. */
4423 ifa_flags &= IFA_F_MANAGETEMPADDR;
4424
4425 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4426 ifm->ifa_prefixlen);
1da177e4
LT		 4427}
4428
479840ff 4429static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 4430 u32 prefered_lft, u32 valid_lft)
081bba5b 4431{
6f704992
YH		 4432 u32 flags;
4433 clock_t expires;
4bed72e4 4434 unsigned long timeout;
53bd6749 4435 bool was_managetempaddr;
5b84efec 4436 bool had_prefixroute;
46d48046 4437
c15b1cca
HFS		 4438 ASSERT_RTNL();
4439
081bba5b
NT		 4440 if (!valid_lft || (prefered_lft > valid_lft))
4441 return -EINVAL;
4442
53bd6749
JP		 4443 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4444 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4445 return -EINVAL;
4446
4bed72e4
YH		 4447 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4448 if (addrconf_finite_timeout(timeout)) {
4449 expires = jiffies_to_clock_t(timeout * HZ);
4450 valid_lft = timeout;
6f704992 4451 flags = RTF_EXPIRES;
4bed72e4
YH		 4452 } else {
4453 expires = 0;
4454 flags = 0;
4455 ifa_flags |= IFA_F_PERMANENT;
6f704992 4456 }
081bba5b 4457
4bed72e4
YH		 4458 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4459 if (addrconf_finite_timeout(timeout)) {
4460 if (timeout == 0)
4461 ifa_flags |= IFA_F_DEPRECATED;
4462 prefered_lft = timeout;
4463 }
081bba5b
NT		 4464
4465 spin_lock_bh(&ifp->lock);
53bd6749 4466 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4467 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4468 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4469 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4470 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4471 IFA_F_NOPREFIXROUTE);
53bd6749 4472 ifp->flags |= ifa_flags;
081bba5b
NT		 4473 ifp->tstamp = jiffies;
4474 ifp->valid_lft = valid_lft;
4475 ifp->prefered_lft = prefered_lft;
4476
4477 spin_unlock_bh(&ifp->lock);
4478 if (!(ifp->flags&IFA_F_TENTATIVE))
4479 ipv6_ifa_notify(0, ifp);
081bba5b 4480
761aac73
TH		 4481 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4482 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4483 expires, flags);
5b84efec
TH		 4484 } else if (had_prefixroute) {
4485 enum cleanup_prefix_rt_t action;
4486 unsigned long rt_expires;
4487
4488 write_lock_bh(&ifp->idev->lock);
4489 action = check_cleanup_prefix_route(ifp, &rt_expires);
4490 write_unlock_bh(&ifp->idev->lock);
4491
4492 if (action != CLEANUP_PREFIX_RT_NOP) {
4493 cleanup_prefix_route(ifp, rt_expires,
4494 action == CLEANUP_PREFIX_RT_DEL);
4495 }
761aac73 4496 }
53bd6749
JP		 4497
4498 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4499 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4500 valid_lft = prefered_lft = 0;
4501 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4502 !was_managetempaddr, jiffies);
4503 }
4504
c15b1cca 4505 addrconf_verify_rtnl();
081bba5b
NT		 4506
4507 return 0;
4508}
4509
1da177e4 4510static int
661d2967 4511inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4512{
3b1e0a65 4513 struct net *net = sock_net(skb->sk);
461d8837
TG		 4514 struct ifaddrmsg *ifm;
4515 struct nlattr *tb[IFA_MAX+1];
caeaba79 4516 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 4517 struct inet6_ifaddr *ifa;
4518 struct net_device *dev;
55ebaef1 4519 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 4520 u32 ifa_flags;
461d8837 4521 int err;
1da177e4 4522
461d8837
TG		 4523 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4524 if (err < 0)
4525 return err;
4526
4527 ifm = nlmsg_data(nlh);
caeaba79 4528 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4529 if (!pfx)
1da177e4
LT		 4530 return -EINVAL;
4531
461d8837 4532 if (tb[IFA_CACHEINFO]) {
0778769d 4533 struct ifa_cacheinfo *ci;
461d8837
TG		 4534
4535 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 4536 valid_lft = ci->ifa_valid;
461d8837
TG		 4537 preferred_lft = ci->ifa_prefered;
4538 } else {
4539 preferred_lft = INFINITY_LIFE_TIME;
4540 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 4541 }
4542
af284937 4543 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4544 if (!dev)
7198f8ce
TG		 4545 return -ENODEV;
4546
479840ff
JP		 4547 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4548
55ebaef1 4549 /* We ignore other flags so far. */
761aac73 4550 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
93a714d6 4551 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
55ebaef1 4552
1cab3da6 4553 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
63159f29 4554 if (!ifa) {
7198f8ce
TG		 4555 /*
4556 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4557 * userspace already relies on not having to provide this.
7198f8ce 4558 */
caeaba79 4559 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 4560 ifm->ifa_prefixlen, ifa_flags,
4561 preferred_lft, valid_lft);
081bba5b
NT		 4562 }
4563
7198f8ce
TG		 4564 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4565 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4566 err = -EEXIST;
4567 else
55ebaef1 4568 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 4569
4570 in6_ifa_put(ifa);
4571
4572 return err;
1da177e4
LT		 4573}
4574
479840ff 4575static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4576 u8 scope, int ifindex)
4577{
4578 struct ifaddrmsg *ifm;
4579
4580 ifm = nlmsg_data(nlh);
4581 ifm->ifa_family = AF_INET6;
4582 ifm->ifa_prefixlen = prefixlen;
4583 ifm->ifa_flags = flags;
4584 ifm->ifa_scope = scope;
4585 ifm->ifa_index = ifindex;
4586}
4587
85486af0
TG		 4588static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4589 unsigned long tstamp, u32 preferred, u32 valid)
4590{
4591 struct ifa_cacheinfo ci;
4592
18a31e1e
TG		 4593 ci.cstamp = cstamp_delta(cstamp);
4594 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4595 ci.ifa_prefered = preferred;
4596 ci.ifa_valid = valid;
4597
4598 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4599}
4600
101bb229
TG		 4601static inline int rt_scope(int ifa_scope)
4602{
4603 if (ifa_scope & IFA_HOST)
4604 return RT_SCOPE_HOST;
4605 else if (ifa_scope & IFA_LINK)
4606 return RT_SCOPE_LINK;
4607 else if (ifa_scope & IFA_SITE)
4608 return RT_SCOPE_SITE;
4609 else
4610 return RT_SCOPE_UNIVERSE;
4611}
4612
0ab6803b
TG		 4613static inline int inet6_ifaddr_msgsize(void)
4614{
339bf98f 4615 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4616 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4617 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4618 + nla_total_size(sizeof(struct ifa_cacheinfo))
4619 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4620}
c5396a31 4621
1da177e4 4622static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4623 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4624{
1da177e4 4625 struct nlmsghdr *nlh;
85486af0 4626 u32 preferred, valid;
1da177e4 4627
15e47304 4628 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4629 if (!nlh)
26932566 4630 return -EMSGSIZE;
0ab6803b 4631
101bb229
TG		 4632 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4633 ifa->idev->dev->ifindex);
4634
fad8da3e
YA		 4635 if (!((ifa->flags&IFA_F_PERMANENT) &&
4636 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4637 preferred = ifa->prefered_lft;
4638 valid = ifa->valid_lft;
4639 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4640 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4641 if (preferred > tval)
4642 preferred -= tval;
4643 else
4644 preferred = 0;
f56619fc
BH		 4645 if (valid != INFINITY_LIFE_TIME) {
4646 if (valid > tval)
4647 valid -= tval;
4648 else
4649 valid = 0;
4650 }
1da177e4
LT		 4651 }
4652 } else {
85486af0
TG		 4653 preferred = INFINITY_LIFE_TIME;
4654 valid = INFINITY_LIFE_TIME;
4655 }
4656
7996c799 4657 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4658 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4659 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4660 goto error;
4661 } else
930345ea 4662 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4663 goto error;
4664
4665 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4666 goto error;
1da177e4 4667
479840ff
JP		 4668 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4669 goto error;
4670
053c095a
JB		 4671 nlmsg_end(skb, nlh);
4672 return 0;
caeaba79
ND		 4673
4674error:
4675 nlmsg_cancel(skb, nlh);
4676 return -EMSGSIZE;
1da177e4
LT		 4677}
4678
4679static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4680 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4681{
1da177e4 4682 struct nlmsghdr *nlh;
101bb229
TG		 4683 u8 scope = RT_SCOPE_UNIVERSE;
4684 int ifindex = ifmca->idev->dev->ifindex;
4685
4686 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4687 scope = RT_SCOPE_SITE;
1da177e4 4688
15e47304 4689 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4690 if (!nlh)
26932566 4691 return -EMSGSIZE;
85486af0 4692
0ab6803b 4693 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4694 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4695 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4696 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4697 nlmsg_cancel(skb, nlh);
4698 return -EMSGSIZE;
4699 }
85486af0 4700
053c095a
JB		 4701 nlmsg_end(skb, nlh);
4702 return 0;
1da177e4
LT		 4703}
4704
4705static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4706 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4707{
1da177e4 4708 struct nlmsghdr *nlh;
101bb229
TG		 4709 u8 scope = RT_SCOPE_UNIVERSE;
4710 int ifindex = ifaca->aca_idev->dev->ifindex;
4711
4712 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4713 scope = RT_SCOPE_SITE;
1da177e4 4714
15e47304 4715 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4716 if (!nlh)
26932566 4717 return -EMSGSIZE;
85486af0 4718
0ab6803b 4719 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4720 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4721 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4722 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4723 nlmsg_cancel(skb, nlh);
4724 return -EMSGSIZE;
4725 }
1da177e4 4726
053c095a
JB		 4727 nlmsg_end(skb, nlh);
4728 return 0;
1da177e4
LT		 4729}
4730
e21e8467 4731enum addr_type_t {
1da177e4
LT		 4732 UNICAST_ADDR,
4733 MULTICAST_ADDR,
4734 ANYCAST_ADDR,
4735};
4736
234b27c3
ED		 4737/* called with rcu_read_lock() */
4738static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4739 struct netlink_callback *cb, enum addr_type_t type,
4740 int s_ip_idx, int *p_ip_idx)
4741{
234b27c3
ED		 4742 struct ifmcaddr6 *ifmca;
4743 struct ifacaddr6 *ifaca;
4744 int err = 1;
4745 int ip_idx = *p_ip_idx;
4746
4747 read_lock_bh(&idev->lock);
4748 switch (type) {
502a2ffd 4749 case UNICAST_ADDR: {
4750 struct inet6_ifaddr *ifa;
4751
234b27c3 4752 /* unicast address incl. temp addr */
502a2ffd 4753 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4754 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4755 continue;
4756 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4757 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4758 cb->nlh->nlmsg_seq,
4759 RTM_NEWADDR,
4760 NLM_F_MULTI);
053c095a 4761 if (err < 0)
234b27c3 4762 break;
63998ac2 4763 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4764 }
4765 break;
502a2ffd 4766 }
234b27c3
ED		 4767 case MULTICAST_ADDR:
4768 /* multicast address */
4769 for (ifmca = idev->mc_list; ifmca;
4770 ifmca = ifmca->next, ip_idx++) {
4771 if (ip_idx < s_ip_idx)
4772 continue;
4773 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4774 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4775 cb->nlh->nlmsg_seq,
4776 RTM_GETMULTICAST,
4777 NLM_F_MULTI);
053c095a 4778 if (err < 0)
234b27c3
ED		 4779 break;
4780 }
4781 break;
4782 case ANYCAST_ADDR:
4783 /* anycast address */
4784 for (ifaca = idev->ac_list; ifaca;
4785 ifaca = ifaca->aca_next, ip_idx++) {
4786 if (ip_idx < s_ip_idx)
4787 continue;
4788 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4789 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4790 cb->nlh->nlmsg_seq,
4791 RTM_GETANYCAST,
4792 NLM_F_MULTI);
053c095a 4793 if (err < 0)
234b27c3
ED		 4794 break;
4795 }
4796 break;
4797 default:
4798 break;
4799 }
4800 read_unlock_bh(&idev->lock);
4801 *p_ip_idx = ip_idx;
4802 return err;
4803}
4804
1da177e4
LT		 4805static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4806 enum addr_type_t type)
4807{
234b27c3
ED		 4808 struct net *net = sock_net(skb->sk);
4809 int h, s_h;
1da177e4
LT		 4810 int idx, ip_idx;
4811 int s_idx, s_ip_idx;
1da177e4 4812 struct net_device *dev;
234b27c3
ED		 4813 struct inet6_dev *idev;
4814 struct hlist_head *head;
1ab1457c 4815
234b27c3
ED		 4816 s_h = cb->args[0];
4817 s_idx = idx = cb->args[1];
4818 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4819
234b27c3 4820 rcu_read_lock();
63998ac2 4821 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4822 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4823 idx = 0;
4824 head = &net->dev_index_head[h];
b67bfe0d 4825 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4826 if (idx < s_idx)
4827 goto cont;
4b97efdf 4828 if (h > s_h || idx > s_idx)
234b27c3
ED		 4829 s_ip_idx = 0;
4830 ip_idx = 0;
e21e8467
SH		 4831 idev = __in6_dev_get(dev);
4832 if (!idev)
234b27c3
ED		 4833 goto cont;
4834
4835 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4836 s_ip_idx, &ip_idx) < 0)
234b27c3 4837 goto done;
7562f876 4838cont:
234b27c3
ED		 4839 idx++;
4840 }
1da177e4 4841 }
234b27c3
ED		 4842done:
4843 rcu_read_unlock();
4844 cb->args[0] = h;
4845 cb->args[1] = idx;
4846 cb->args[2] = ip_idx;
4847
1da177e4
LT		 4848 return skb->len;
4849}
4850
4851static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4852{
4853 enum addr_type_t type = UNICAST_ADDR;
b854272b 4854
1da177e4
LT		 4855 return inet6_dump_addr(skb, cb, type);
4856}
4857
4858static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4859{
4860 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4861
1da177e4
LT		 4862 return inet6_dump_addr(skb, cb, type);
4863}
4864
4865
4866static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4867{
4868 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4869
1da177e4
LT		 4870 return inet6_dump_addr(skb, cb, type);
4871}
4872
661d2967 4873static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4874{
3b1e0a65 4875 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4876 struct ifaddrmsg *ifm;
4877 struct nlattr *tb[IFA_MAX+1];
caeaba79 4878 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4879 struct net_device *dev = NULL;
4880 struct inet6_ifaddr *ifa;
4881 struct sk_buff *skb;
6c223828
NT		 4882 int err;
4883
1b29fc2c
TG		 4884 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4885 if (err < 0)
4886 goto errout;
4887
caeaba79 4888 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
63159f29 4889 if (!addr) {
1b29fc2c
TG		 4890 err = -EINVAL;
4891 goto errout;
6c223828 4892 }
6c223828 4893
1b29fc2c 4894 ifm = nlmsg_data(nlh);
6c223828 4895 if (ifm->ifa_index)
6fda7350 4896 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4897
e21e8467
SH		 4898 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4899 if (!ifa) {
1b29fc2c
TG		 4900 err = -EADDRNOTAVAIL;
4901 goto errout;
4902 }
6c223828 4903
e21e8467
SH		 4904 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4905 if (!skb) {
6c223828 4906 err = -ENOBUFS;
1b29fc2c 4907 goto errout_ifa;
6c223828
NT		 4908 }
4909
15e47304 4910 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4911 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4912 if (err < 0) {
4913 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4914 WARN_ON(err == -EMSGSIZE);
4915 kfree_skb(skb);
4916 goto errout_ifa;
4917 }
15e47304 4918 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4919errout_ifa:
6c223828 4920 in6_ifa_put(ifa);
1b29fc2c 4921errout:
6c223828 4922 return err;
6c223828
NT		 4923}
4924
1da177e4
LT		 4925static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4926{
4927 struct sk_buff *skb;
c346dca1 4928 struct net *net = dev_net(ifa->idev->dev);
5d620266 4929 int err = -ENOBUFS;
1da177e4 4930
f784ad3d
MB		 4931 /* Don't send DELADDR notification for TENTATIVE address,
4932 * since NEWADDR notification is sent only after removing
4933 * TENTATIVE flag.
4934 */
4935 if (ifa->flags & IFA_F_TENTATIVE && event == RTM_DELADDR)
4936 return;
4937
0ab6803b 4938 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 4939 if (!skb)
5d620266
TG		 4940 goto errout;
4941
4942 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4943 if (err < 0) {
4944 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4945 WARN_ON(err == -EMSGSIZE);
4946 kfree_skb(skb);
4947 goto errout;
4948 }
1ce85fe4
PNA		 4949 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4950 return;
5d620266
TG		 4951errout:
4952 if (err < 0)
6fda7350 4953 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4954}
4955
b6f99a21 4956static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4957 __s32 *array, int bytes)
4958{
04561c1f
TG		 4959 BUG_ON(bytes < (DEVCONF_MAX * 4));
4960
1da177e4
LT		 4961 memset(array, 0, bytes);
4962 array[DEVCONF_FORWARDING] = cnf->forwarding;
4963 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4964 array[DEVCONF_MTU6] = cnf->mtu6;
4965 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4966 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4967 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4968 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4969 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4970 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4971 jiffies_to_msecs(cnf->rtr_solicit_interval);
bd11f074
MŻ		 4972 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
4973 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
93908d19
TG		 4974 array[DEVCONF_RTR_SOLICIT_DELAY] =
4975 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4976 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4977 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4978 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4979 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4980 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4981 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4982 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4983 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4984 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4985 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4986 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4987 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 4988 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 4989 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4990#ifdef CONFIG_IPV6_ROUTER_PREF
4991 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4992 array[DEVCONF_RTR_PROBE_INTERVAL] =
4993 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4994#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 4995 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
09c884d4
YH		 4996 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4997#endif
930d6ff2 4998#endif
fbea49e1 4999 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 5000 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 5001#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5002 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 5003 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 5004#endif
7bc570c8
YH		 5005#ifdef CONFIG_IPV6_MROUTE
5006 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5007#endif
778d80be 5008 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 5009 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 5010 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 5011 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 5012 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 5013 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 5014 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 5015 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 5016 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 5017 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 5018 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 5019 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 5020 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1ababeba 5021 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
bf355b8d
DL		 5022#ifdef CONFIG_IPV6_SEG6_HMAC
5023 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5024#endif
adc176c5 5025 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
d35a00b8 5026 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
df789fe7 5027 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
1da177e4
LT		 5028}
5029
b382b191
TG		 5030static inline size_t inet6_ifla6_size(void)
5031{
5032 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5033 + nla_total_size(sizeof(struct ifla_cacheinfo))
5034 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5035 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 5036 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5037 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 5038}
5039
339bf98f
TG		 5040static inline size_t inet6_if_nlmsg_size(void)
5041{
5042 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5043 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5044 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5045 + nla_total_size(4) /* IFLA_MTU */
5046 + nla_total_size(4) /* IFLA_LINK */
0344338b 5047 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 5048 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 5049}
c5396a31 5050
be281e55 5051static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
aca05671 5052 int bytes)
7f7d9a6b
HX		 5053{
5054 int i;
aca05671 5055 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
7f7d9a6b
HX		 5056 BUG_ON(pad < 0);
5057
5058 /* Use put_unaligned() because stats may not be aligned for u64. */
aca05671
JH		 5059 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5060 for (i = 1; i < ICMP6_MIB_MAX; i++)
be281e55 5061 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b 5062
aca05671 5063 memset(&stats[ICMP6_MIB_MAX], 0, pad);
7f7d9a6b
HX		 5064}
5065
698365fa 5066static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 5067 int bytes, size_t syncpoff)
4ce3c183 5068{
a3a77372
R		 5069 int i, c;
5070 u64 buff[IPSTATS_MIB_MAX];
5071 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5072
4ce3c183
ED		 5073 BUG_ON(pad < 0);
5074
a3a77372
R		 5075 memset(buff, 0, sizeof(buff));
5076 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 5077
a3a77372
R		 5078 for_each_possible_cpu(c) {
5079 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5080 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5081 }
5082
5083 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5084 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 5085}
5086
7f7d9a6b
HX		 5087static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5088 int bytes)
5089{
e21e8467 5090 switch (attrtype) {
7f7d9a6b 5091 case IFLA_INET6_STATS:
a3a77372
R		 5092 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5093 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 5094 break;
5095 case IFLA_INET6_ICMP6STATS:
aca05671 5096 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
7f7d9a6b
HX		 5097 break;
5098 }
5099}
5100
d5566fd7
SV		 5101static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5102 u32 ext_filter_mask)
b382b191
TG		 5103{
5104 struct nlattr *nla;
5105 struct ifla_cacheinfo ci;
5106
c78679e8
DM		 5107 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5108 goto nla_put_failure;
b382b191 5109 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 5110 ci.tstamp = cstamp_delta(idev->tstamp);
5111 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 5112 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 5113 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5114 goto nla_put_failure;
b382b191 5115 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 5116 if (!nla)
b382b191
TG		 5117 goto nla_put_failure;
5118 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5119
5120 /* XXX - MC not implemented */
5121
d5566fd7
SV		 5122 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5123 return 0;
5124
b382b191 5125 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 5126 if (!nla)
b382b191
TG		 5127 goto nla_put_failure;
5128 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5129
5130 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 5131 if (!nla)
b382b191
TG		 5132 goto nla_put_failure;
5133 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5134
f53adae4 5135 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 5136 if (!nla)
f53adae4 5137 goto nla_put_failure;
bc91b0f0 5138
d35a00b8 5139 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
bc91b0f0
JP		 5140 goto nla_put_failure;
5141
f53adae4
DB		 5142 read_lock_bh(&idev->lock);
5143 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5144 read_unlock_bh(&idev->lock);
5145
b382b191
TG		 5146 return 0;
5147
5148nla_put_failure:
5149 return -EMSGSIZE;
5150}
5151
b1974ed0
AR		 5152static size_t inet6_get_link_af_size(const struct net_device *dev,
5153 u32 ext_filter_mask)
b382b191
TG		 5154{
5155 if (!__in6_dev_get(dev))
5156 return 0;
5157
5158 return inet6_ifla6_size();
5159}
5160
d5566fd7
SV		 5161static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5162 u32 ext_filter_mask)
b382b191
TG		 5163{
5164 struct inet6_dev *idev = __in6_dev_get(dev);
5165
5166 if (!idev)
5167 return -ENODATA;
5168
d5566fd7 5169 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5170 return -EMSGSIZE;
5171
5172 return 0;
5173}
5174
f53adae4
DB		 5175static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5176{
f53adae4
DB		 5177 struct inet6_ifaddr *ifp;
5178 struct net_device *dev = idev->dev;
47e27d5e 5179 bool clear_token, update_rs = false;
dc848292 5180 struct in6_addr ll_addr;
f53adae4 5181
c15b1cca
HFS		 5182 ASSERT_RTNL();
5183
63159f29 5184 if (!token)
f53adae4 5185 return -EINVAL;
f53adae4
DB		 5186 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5187 return -EINVAL;
f53adae4
DB		 5188 if (!ipv6_accept_ra(idev))
5189 return -EINVAL;
bd11f074 5190 if (idev->cnf.rtr_solicits == 0)
f53adae4
DB		 5191 return -EINVAL;
5192
5193 write_lock_bh(&idev->lock);
5194
5195 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5196 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5197
5198 write_unlock_bh(&idev->lock);
5199
47e27d5e
DB		 5200 clear_token = ipv6_addr_any(token);
5201 if (clear_token)
5202 goto update_lft;
5203
dc848292
HFS		 5204 if (!idev->dead && (idev->if_flags & IF_READY) &&
5205 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5206 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5207 /* If we're not ready, then normal ifup will take care
5208 * of this. Otherwise, we need to request our rs here.
5209 */
5210 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5211 update_rs = true;
5212 }
f53adae4 5213
47e27d5e 5214update_lft:
f53adae4 5215 write_lock_bh(&idev->lock);
fc403832 5216
77ecaace 5217 if (update_rs) {
fc403832 5218 idev->if_flags |= IF_RS_SENT;
bd11f074
MŻ		 5219 idev->rs_interval = rfc3315_s14_backoff_init(
5220 idev->cnf.rtr_solicit_interval);
77ecaace 5221 idev->rs_probes = 1;
bd11f074 5222 addrconf_mod_rs_timer(idev, idev->rs_interval);
77ecaace 5223 }
f53adae4
DB		 5224
5225 /* Well, that's kinda nasty ... */
5226 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5227 spin_lock(&ifp->lock);
617fe29d 5228 if (ifp->tokenized) {
f53adae4
DB		 5229 ifp->valid_lft = 0;
5230 ifp->prefered_lft = 0;
5231 }
5232 spin_unlock(&ifp->lock);
5233 }
5234
5235 write_unlock_bh(&idev->lock);
b2ed64a9 5236 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 5237 addrconf_verify_rtnl();
f53adae4
DB		 5238 return 0;
5239}
5240
11b1f828
DB		 5241static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5242 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5243 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5244};
5245
5246static int inet6_validate_link_af(const struct net_device *dev,
5247 const struct nlattr *nla)
5248{
5249 struct nlattr *tb[IFLA_INET6_MAX + 1];
5250
5251 if (dev && !__in6_dev_get(dev))
5252 return -EAFNOSUPPORT;
5253
5254 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5255}
5256
d35a00b8
FJ		 5257static int check_addr_gen_mode(int mode)
5258{
5259 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5260 mode != IN6_ADDR_GEN_MODE_NONE &&
5261 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5262 mode != IN6_ADDR_GEN_MODE_RANDOM)
5263 return -EINVAL;
5264 return 1;
5265}
5266
5267static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5268 int mode)
5269{
5270 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5271 !idev->cnf.stable_secret.initialized &&
5272 !net->ipv6.devconf_dflt->stable_secret.initialized)
5273 return -EINVAL;
5274 return 1;
5275}
5276
f53adae4
DB		 5277static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5278{
5279 int err = -EINVAL;
5280 struct inet6_dev *idev = __in6_dev_get(dev);
5281 struct nlattr *tb[IFLA_INET6_MAX + 1];
5282
5283 if (!idev)
5284 return -EAFNOSUPPORT;
5285
5286 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5287 BUG();
5288
bc91b0f0 5289 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 5290 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 5291 if (err)
5292 return err;
5293 }
5294
5295 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5296 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5297
d35a00b8
FJ		 5298 if (check_addr_gen_mode(mode) < 0 ||
5299 check_stable_privacy(idev, dev_net(dev), mode) < 0)
bc91b0f0 5300 return -EINVAL;
622c81d5 5301
d35a00b8 5302 idev->cnf.addr_gen_mode = mode;
bc91b0f0
JP		 5303 err = 0;
5304 }
f53adae4
DB		 5305
5306 return err;
5307}
5308
1ab1457c 5309static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5310 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5311{
04561c1f 5312 struct net_device *dev = idev->dev;
04561c1f
TG		 5313 struct ifinfomsg *hdr;
5314 struct nlmsghdr *nlh;
5315 void *protoinfo;
04561c1f 5316
15e47304 5317 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5318 if (!nlh)
26932566 5319 return -EMSGSIZE;
04561c1f
TG		 5320
5321 hdr = nlmsg_data(nlh);
5322 hdr->ifi_family = AF_INET6;
5323 hdr->__ifi_pad = 0;
5324 hdr->ifi_type = dev->type;
5325 hdr->ifi_index = dev->ifindex;
5326 hdr->ifi_flags = dev_get_flags(dev);
5327 hdr->ifi_change = 0;
5328
c78679e8
DM		 5329 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5330 (dev->addr_len &&
5331 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5332 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5333 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5334 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5335 nla_put_u8(skb, IFLA_OPERSTATE,
5336 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5337 goto nla_put_failure;
04561c1f 5338 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 5339 if (!protoinfo)
04561c1f 5340 goto nla_put_failure;
1da177e4 5341
d5566fd7 5342 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5343 goto nla_put_failure;
1da177e4 5344
04561c1f 5345 nla_nest_end(skb, protoinfo);
053c095a
JB		 5346 nlmsg_end(skb, nlh);
5347 return 0;
1da177e4 5348
04561c1f 5349nla_put_failure:
26932566
PM		 5350 nlmsg_cancel(skb, nlh);
5351 return -EMSGSIZE;
1da177e4
LT		 5352}
5353
5354static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5355{
3b1e0a65 5356 struct net *net = sock_net(skb->sk);
84d2697d 5357 int h, s_h;
434a8a58 5358 int idx = 0, s_idx;
1da177e4
LT		 5359 struct net_device *dev;
5360 struct inet6_dev *idev;
84d2697d 5361 struct hlist_head *head;
1da177e4 5362
84d2697d
ED		 5363 s_h = cb->args[0];
5364 s_idx = cb->args[1];
5365
5366 rcu_read_lock();
5367 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5368 idx = 0;
5369 head = &net->dev_index_head[h];
b67bfe0d 5370 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5371 if (idx < s_idx)
5372 goto cont;
5373 idev = __in6_dev_get(dev);
5374 if (!idev)
5375 goto cont;
5376 if (inet6_fill_ifinfo(skb, idev,
15e47304 5377 NETLINK_CB(cb->skb).portid,
84d2697d 5378 cb->nlh->nlmsg_seq,
053c095a 5379 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5380 goto out;
7562f876 5381cont:
84d2697d
ED		 5382 idx++;
5383 }
1da177e4 5384 }
84d2697d
ED		 5385out:
5386 rcu_read_unlock();
5387 cb->args[1] = idx;
5388 cb->args[0] = h;
1da177e4
LT		 5389
5390 return skb->len;
5391}
5392
5393void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5394{
5395 struct sk_buff *skb;
c346dca1 5396 struct net *net = dev_net(idev->dev);
8d7a76c9 5397 int err = -ENOBUFS;
1ab1457c 5398
339bf98f 5399 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5400 if (!skb)
8d7a76c9
TG		 5401 goto errout;
5402
5403 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5404 if (err < 0) {
5405 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5406 WARN_ON(err == -EMSGSIZE);
5407 kfree_skb(skb);
5408 goto errout;
5409 }
5f75a104 5410 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5411 return;
8d7a76c9
TG		 5412errout:
5413 if (err < 0)
5f75a104 5414 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5415}
5416
339bf98f
TG		 5417static inline size_t inet6_prefix_nlmsg_size(void)
5418{
5419 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5420 + nla_total_size(sizeof(struct in6_addr))
5421 + nla_total_size(sizeof(struct prefix_cacheinfo));
5422}
c5396a31 5423
1da177e4 5424static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5425 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5426 int event, unsigned int flags)
1da177e4 5427{
6051e2f4
TG		 5428 struct prefixmsg *pmsg;
5429 struct nlmsghdr *nlh;
1da177e4
LT		 5430 struct prefix_cacheinfo ci;
5431
15e47304 5432 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5433 if (!nlh)
26932566 5434 return -EMSGSIZE;
6051e2f4
TG		 5435
5436 pmsg = nlmsg_data(nlh);
1da177e4 5437 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5438 pmsg->prefix_pad1 = 0;
5439 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5440 pmsg->prefix_ifindex = idev->dev->ifindex;
5441 pmsg->prefix_len = pinfo->prefix_len;
5442 pmsg->prefix_type = pinfo->type;
8a47077a 5443 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5444 pmsg->prefix_flags = 0;
5445 if (pinfo->onlink)
5446 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5447 if (pinfo->autoconf)
5448 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5449
c78679e8
DM		 5450 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5451 goto nla_put_failure;
1da177e4
LT		 5452 ci.preferred_time = ntohl(pinfo->prefered);
5453 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5454 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5455 goto nla_put_failure;
053c095a
JB		 5456 nlmsg_end(skb, nlh);
5457 return 0;
1da177e4 5458
6051e2f4 5459nla_put_failure:
26932566
PM		 5460 nlmsg_cancel(skb, nlh);
5461 return -EMSGSIZE;
1da177e4
LT		 5462}
5463
1ab1457c 5464static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5465 struct prefix_info *pinfo)
5466{
5467 struct sk_buff *skb;
c346dca1 5468 struct net *net = dev_net(idev->dev);
8c384bfa 5469 int err = -ENOBUFS;
1da177e4 5470
339bf98f 5471 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5472 if (!skb)
8c384bfa
TG		 5473 goto errout;
5474
5475 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5476 if (err < 0) {
5477 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5478 WARN_ON(err == -EMSGSIZE);
5479 kfree_skb(skb);
5480 goto errout;
5481 }
1ce85fe4
PNA		 5482 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5483 return;
8c384bfa
TG		 5484errout:
5485 if (err < 0)
6fda7350 5486 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5487}
5488
1da177e4
LT		 5489static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5490{
63998ac2
ND		 5491 struct net *net = dev_net(ifp->idev->dev);
5492
c15b1cca
HFS		 5493 if (event)
5494 ASSERT_RTNL();
5495
1da177e4
LT		 5496 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5497
5498 switch (event) {
5499 case RTM_NEWADDR:
95c385b4
NH		 5500 /*
5501 * If the address was optimistic
5502 * we inserted the route at the start of
5503 * our DAD process, so we don't need
5504 * to do it again
5505 */
5506 if (!(ifp->rt->rt6i_node))
5507 ip6_ins_rt(ifp->rt);
1da177e4
LT		 5508 if (ifp->idev->cnf.forwarding)
5509 addrconf_join_anycast(ifp);
7996c799 5510 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 5511 addrconf_prefix_route(&ifp->peer_addr, 128,
5512 ifp->idev->dev, 0, 0);
1da177e4
LT		 5513 break;
5514 case RTM_DELADDR:
5515 if (ifp->idev->cnf.forwarding)
5516 addrconf_leave_anycast(ifp);
5517 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5518 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 5519 struct rt6_info *rt;
caeaba79 5520
e7478dfc
ND		 5521 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5522 ifp->idev->dev, 0, 0);
8e3d5be7
MKL		 5523 if (rt)
5524 ip6_del_rt(rt);
caeaba79 5525 }
38bd10c4
DA		 5526 if (ifp->rt) {
5527 dst_hold(&ifp->rt->dst);
5528 ip6_del_rt(ifp->rt);
5529 }
705f1c86 5530 rt_genid_bump_ipv6(net);
1da177e4
LT		 5531 break;
5532 }
63998ac2 5533 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5534}
5535
5536static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5537{
8814c4b5 5538 rcu_read_lock_bh();
1da177e4
LT		 5539 if (likely(ifp->idev->dead == 0))
5540 __ipv6_ifa_notify(event, ifp);
8814c4b5 5541 rcu_read_unlock_bh();
1da177e4
LT		 5542}
5543
5544#ifdef CONFIG_SYSCTL
5545
5546static
fe2c6338 5547int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5548 void __user *buffer, size_t *lenp, loff_t *ppos)
5549{
5550 int *valp = ctl->data;
5551 int val = *valp;
88af182e 5552 loff_t pos = *ppos;
fe2c6338 5553 struct ctl_table lctl;
1da177e4
LT		 5554 int ret;
5555
013d97e9
FR		 5556 /*
5557 * ctl->data points to idev->cnf.forwarding, we should
5558 * not modify it until we get the rtnl lock.
5559 */
5560 lctl = *ctl;
5561 lctl.data = &val;
5562
5563 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5564
c8fecf22 5565 if (write)
b325fddb 5566 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5567 if (ret)
5568 *ppos = pos;
1ab1457c 5569 return ret;
1da177e4
LT		 5570}
5571
77751427
ML		 5572static
5573int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5574 void __user *buffer, size_t *lenp, loff_t *ppos)
5575{
5576 struct inet6_dev *idev = ctl->extra1;
5577 int min_mtu = IPV6_MIN_MTU;
5578 struct ctl_table lctl;
5579
5580 lctl = *ctl;
5581 lctl.extra1 = &min_mtu;
5582 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5583
5584 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5585}
5586
56d417b1
BH		 5587static void dev_disable_change(struct inet6_dev *idev)
5588{
75538c2b
CW		 5589 struct netdev_notifier_info info;
5590
56d417b1
BH		 5591 if (!idev || !idev->dev)
5592 return;
5593
75538c2b 5594 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5595 if (idev->cnf.disable_ipv6)
75538c2b 5596 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5597 else
75538c2b 5598 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5599}
5600
5601static void addrconf_disable_change(struct net *net, __s32 newf)
5602{
5603 struct net_device *dev;
5604 struct inet6_dev *idev;
5605
03e4deff 5606 for_each_netdev(net, dev) {
56d417b1
BH		 5607 idev = __in6_dev_get(dev);
5608 if (idev) {
5609 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5610 idev->cnf.disable_ipv6 = newf;
5611 if (changed)
5612 dev_disable_change(idev);
5613 }
56d417b1 5614 }
56d417b1
BH		 5615}
5616
013d97e9 5617static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5618{
5619 struct net *net;
013d97e9
FR		 5620 int old;
5621
5622 if (!rtnl_trylock())
5623 return restart_syscall();
56d417b1
BH		 5624
5625 net = (struct net *)table->extra2;
013d97e9
FR		 5626 old = *p;
5627 *p = newf;
56d417b1 5628
013d97e9
FR		 5629 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5630 rtnl_unlock();
56d417b1 5631 return 0;
88af182e 5632 }
56d417b1
BH		 5633
5634 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5635 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5636 addrconf_disable_change(net, newf);
013d97e9 5637 } else if ((!newf) ^ (!old))
56d417b1
BH		 5638 dev_disable_change((struct inet6_dev *)table->extra1);
5639
5640 rtnl_unlock();
5641 return 0;
5642}
5643
5644static
fe2c6338 5645int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5646 void __user *buffer, size_t *lenp, loff_t *ppos)
5647{
5648 int *valp = ctl->data;
5649 int val = *valp;
88af182e 5650 loff_t pos = *ppos;
fe2c6338 5651 struct ctl_table lctl;
56d417b1
BH		 5652 int ret;
5653
013d97e9
FR		 5654 /*
5655 * ctl->data points to idev->cnf.disable_ipv6, we should
5656 * not modify it until we get the rtnl lock.
5657 */
5658 lctl = *ctl;
5659 lctl.data = &val;
5660
5661 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5662
5663 if (write)
5664 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5665 if (ret)
5666 *ppos = pos;
56d417b1
BH		 5667 return ret;
5668}
5669
c92d5491 5670static
5671int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5672 void __user *buffer, size_t *lenp, loff_t *ppos)
5673{
5674 int *valp = ctl->data;
5675 int ret;
5676 int old, new;
5677
5678 old = *valp;
5679 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5680 new = *valp;
5681
5682 if (write && old != new) {
5683 struct net *net = ctl->extra2;
5684
5685 if (!rtnl_trylock())
5686 return restart_syscall();
5687
5688 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
85b3daad
DA		 5689 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5690 NETCONFA_PROXY_NEIGH,
c92d5491 5691 NETCONFA_IFINDEX_DEFAULT,
5692 net->ipv6.devconf_dflt);
5693 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
85b3daad
DA		 5694 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5695 NETCONFA_PROXY_NEIGH,
c92d5491 5696 NETCONFA_IFINDEX_ALL,
5697 net->ipv6.devconf_all);
5698 else {
5699 struct inet6_dev *idev = ctl->extra1;
5700
85b3daad
DA		 5701 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5702 NETCONFA_PROXY_NEIGH,
c92d5491 5703 idev->dev->ifindex,
5704 &idev->cnf);
5705 }
5706 rtnl_unlock();
5707 }
5708
5709 return ret;
5710}
5711
d35a00b8
FJ		 5712static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5713 void __user *buffer, size_t *lenp,
5714 loff_t *ppos)
5715{
5716 int ret = 0;
5717 int new_val;
5718 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5719 struct net *net = (struct net *)ctl->extra2;
5720
8c171d6c
FJ		 5721 if (!rtnl_trylock())
5722 return restart_syscall();
5723
d35a00b8
FJ		 5724 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5725
5726 if (write) {
5727 new_val = *((int *)ctl->data);
5728
8c171d6c
FJ		 5729 if (check_addr_gen_mode(new_val) < 0) {
5730 ret = -EINVAL;
5731 goto out;
5732 }
d35a00b8
FJ		 5733
5734 /* request for default */
5735 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5736 ipv6_devconf_dflt.addr_gen_mode = new_val;
5737
5738 /* request for individual net device */
5739 } else {
5740 if (!idev)
8c171d6c 5741 goto out;
d35a00b8 5742
8c171d6c
FJ		 5743 if (check_stable_privacy(idev, net, new_val) < 0) {
5744 ret = -EINVAL;
5745 goto out;
5746 }
d35a00b8
FJ		 5747
5748 if (idev->cnf.addr_gen_mode != new_val) {
5749 idev->cnf.addr_gen_mode = new_val;
d35a00b8 5750 addrconf_dev_config(idev->dev);
d35a00b8
FJ		 5751 }
5752 }
5753 }
5754
8c171d6c
FJ		 5755out:
5756 rtnl_unlock();
5757
d35a00b8
FJ		 5758 return ret;
5759}
5760
3d1bec99
HFS		 5761static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5762 void __user *buffer, size_t *lenp,
5763 loff_t *ppos)
5764{
5765 int err;
5766 struct in6_addr addr;
5767 char str[IPV6_MAX_STRLEN];
5768 struct ctl_table lctl = *ctl;
622c81d5 5769 struct net *net = ctl->extra2;
3d1bec99
HFS		 5770 struct ipv6_stable_secret *secret = ctl->data;
5771
622c81d5
HFS		 5772 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5773 return -EIO;
5774
3d1bec99
HFS		 5775 lctl.maxlen = IPV6_MAX_STRLEN;
5776 lctl.data = str;
5777
5778 if (!rtnl_trylock())
5779 return restart_syscall();
5780
5781 if (!write && !secret->initialized) {
5782 err = -EIO;
5783 goto out;
5784 }
5785
5449a5ca
WC		 5786 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5787 if (err >= sizeof(str)) {
5788 err = -EIO;
5789 goto out;
3d1bec99
HFS		 5790 }
5791
5792 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5793 if (err || !write)
5794 goto out;
5795
5796 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5797 err = -EIO;
5798 goto out;
5799 }
5800
5801 secret->initialized = true;
5802 secret->secret = addr;
5803
622c81d5
HFS		 5804 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5805 struct net_device *dev;
5806
5807 for_each_netdev(net, dev) {
5808 struct inet6_dev *idev = __in6_dev_get(dev);
5809
5810 if (idev) {
d35a00b8 5811 idev->cnf.addr_gen_mode =
622c81d5
HFS		 5812 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5813 }
5814 }
5815 } else {
5816 struct inet6_dev *idev = ctl->extra1;
5817
d35a00b8 5818 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
622c81d5
HFS		 5819 }
5820
3d1bec99
HFS		 5821out:
5822 rtnl_unlock();
5823
5824 return err;
5825}
c92d5491 5826
35103d11
AG		 5827static
5828int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5829 int write,
5830 void __user *buffer,
5831 size_t *lenp,
5832 loff_t *ppos)
5833{
5834 int *valp = ctl->data;
5835 int val = *valp;
5836 loff_t pos = *ppos;
5837 struct ctl_table lctl;
5838 int ret;
5839
5840 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5841 * we should not modify it until we get the rtnl lock.
5842 */
5843 lctl = *ctl;
5844 lctl.data = &val;
5845
5846 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5847
5848 if (write)
5849 ret = addrconf_fixup_linkdown(ctl, valp, val);
5850 if (ret)
5851 *ppos = pos;
5852 return ret;
5853}
5854
df789fe7
DF		 5855static
5856void addrconf_set_nopolicy(struct rt6_info *rt, int action)
5857{
5858 if (rt) {
5859 if (action)
5860 rt->dst.flags |= DST_NOPOLICY;
5861 else
5862 rt->dst.flags &= ~DST_NOPOLICY;
5863 }
5864}
5865
5866static
5867void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
5868{
5869 struct inet6_ifaddr *ifa;
5870
5871 read_lock_bh(&idev->lock);
5872 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5873 spin_lock(&ifa->lock);
5874 if (ifa->rt) {
5875 struct rt6_info *rt = ifa->rt;
5876 struct fib6_table *table = rt->rt6i_table;
5877 int cpu;
5878
5879 read_lock(&table->tb6_lock);
5880 addrconf_set_nopolicy(ifa->rt, val);
5881 if (rt->rt6i_pcpu) {
5882 for_each_possible_cpu(cpu) {
5883 struct rt6_info **rtp;
5884
5885 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
5886 addrconf_set_nopolicy(*rtp, val);
5887 }
5888 }
5889 read_unlock(&table->tb6_lock);
5890 }
5891 spin_unlock(&ifa->lock);
5892 }
5893 read_unlock_bh(&idev->lock);
5894}
5895
5896static
5897int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
5898{
5899 struct inet6_dev *idev;
5900 struct net *net;
5901
5902 if (!rtnl_trylock())
5903 return restart_syscall();
5904
5905 *valp = val;
5906
5907 net = (struct net *)ctl->extra2;
5908 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
5909 rtnl_unlock();
5910 return 0;
5911 }
5912
5913 if (valp == &net->ipv6.devconf_all->disable_policy) {
5914 struct net_device *dev;
5915
5916 for_each_netdev(net, dev) {
5917 idev = __in6_dev_get(dev);
5918 if (idev)
5919 addrconf_disable_policy_idev(idev, val);
5920 }
5921 } else {
5922 idev = (struct inet6_dev *)ctl->extra1;
5923 addrconf_disable_policy_idev(idev, val);
5924 }
5925
5926 rtnl_unlock();
5927 return 0;
5928}
5929
5930static
5931int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
5932 void __user *buffer, size_t *lenp,
5933 loff_t *ppos)
5934{
5935 int *valp = ctl->data;
5936 int val = *valp;
5937 loff_t pos = *ppos;
5938 struct ctl_table lctl;
5939 int ret;
5940
5941 lctl = *ctl;
5942 lctl.data = &val;
5943 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5944
5945 if (write && (*valp != val))
5946 ret = addrconf_disable_policy(ctl, valp, val);
5947
5948 if (ret)
5949 *ppos = pos;
5950
5951 return ret;
5952}
5953
cb4a4c69 5954static int minus_one = -1;
cb9e684e
MŻ		 5955static const int one = 1;
5956static const int two_five_five = 255;
5957
607ea7cd 5958static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 5959 {
5960 .procname = "forwarding",
5961 .data = &ipv6_devconf.forwarding,
5962 .maxlen = sizeof(int),
5963 .mode = 0644,
5964 .proc_handler = addrconf_sysctl_forward,
5965 },
5966 {
5967 .procname = "hop_limit",
5968 .data = &ipv6_devconf.hop_limit,
5969 .maxlen = sizeof(int),
5970 .mode = 0644,
cb9e684e
MŻ		 5971 .proc_handler = proc_dointvec_minmax,
5972 .extra1 = (void *)&one,
5973 .extra2 = (void *)&two_five_five,
5df1f77f
KK		 5974 },
5975 {
5976 .procname = "mtu",
5977 .data = &ipv6_devconf.mtu6,
5978 .maxlen = sizeof(int),
5979 .mode = 0644,
5980 .proc_handler = addrconf_sysctl_mtu,
5981 },
5982 {
5983 .procname = "accept_ra",
5984 .data = &ipv6_devconf.accept_ra,
5985 .maxlen = sizeof(int),
5986 .mode = 0644,
5987 .proc_handler = proc_dointvec,
5988 },
5989 {
5990 .procname = "accept_redirects",
5991 .data = &ipv6_devconf.accept_redirects,
5992 .maxlen = sizeof(int),
5993 .mode = 0644,
5994 .proc_handler = proc_dointvec,
5995 },
5996 {
5997 .procname = "autoconf",
5998 .data = &ipv6_devconf.autoconf,
5999 .maxlen = sizeof(int),
6000 .mode = 0644,
6001 .proc_handler = proc_dointvec,
6002 },
6003 {
6004 .procname = "dad_transmits",
6005 .data = &ipv6_devconf.dad_transmits,
6006 .maxlen = sizeof(int),
6007 .mode = 0644,
6008 .proc_handler = proc_dointvec,
6009 },
6010 {
6011 .procname = "router_solicitations",
6012 .data = &ipv6_devconf.rtr_solicits,
6013 .maxlen = sizeof(int),
6014 .mode = 0644,
cb4a4c69
MŻ		 6015 .proc_handler = proc_dointvec_minmax,
6016 .extra1 = &minus_one,
5df1f77f
KK		 6017 },
6018 {
6019 .procname = "router_solicitation_interval",
6020 .data = &ipv6_devconf.rtr_solicit_interval,
6021 .maxlen = sizeof(int),
6022 .mode = 0644,
6023 .proc_handler = proc_dointvec_jiffies,
6024 },
bd11f074
MŻ		 6025 {
6026 .procname = "router_solicitation_max_interval",
6027 .data = &ipv6_devconf.rtr_solicit_max_interval,
6028 .maxlen = sizeof(int),
6029 .mode = 0644,
6030 .proc_handler = proc_dointvec_jiffies,
6031 },
5df1f77f
KK		 6032 {
6033 .procname = "router_solicitation_delay",
6034 .data = &ipv6_devconf.rtr_solicit_delay,
6035 .maxlen = sizeof(int),
6036 .mode = 0644,
6037 .proc_handler = proc_dointvec_jiffies,
6038 },
6039 {
6040 .procname = "force_mld_version",
6041 .data = &ipv6_devconf.force_mld_version,
6042 .maxlen = sizeof(int),
6043 .mode = 0644,
6044 .proc_handler = proc_dointvec,
6045 },
6046 {
6047 .procname = "mldv1_unsolicited_report_interval",
6048 .data =
6049 &ipv6_devconf.mldv1_unsolicited_report_interval,
6050 .maxlen = sizeof(int),
6051 .mode = 0644,
6052 .proc_handler = proc_dointvec_ms_jiffies,
6053 },
6054 {
6055 .procname = "mldv2_unsolicited_report_interval",
6056 .data =
6057 &ipv6_devconf.mldv2_unsolicited_report_interval,
6058 .maxlen = sizeof(int),
6059 .mode = 0644,
6060 .proc_handler = proc_dointvec_ms_jiffies,
6061 },
6062 {
6063 .procname = "use_tempaddr",
6064 .data = &ipv6_devconf.use_tempaddr,
6065 .maxlen = sizeof(int),
6066 .mode = 0644,
6067 .proc_handler = proc_dointvec,
6068 },
6069 {
6070 .procname = "temp_valid_lft",
6071 .data = &ipv6_devconf.temp_valid_lft,
6072 .maxlen = sizeof(int),
6073 .mode = 0644,
6074 .proc_handler = proc_dointvec,
6075 },
6076 {
6077 .procname = "temp_prefered_lft",
6078 .data = &ipv6_devconf.temp_prefered_lft,
6079 .maxlen = sizeof(int),
6080 .mode = 0644,
6081 .proc_handler = proc_dointvec,
6082 },
6083 {
6084 .procname = "regen_max_retry",
6085 .data = &ipv6_devconf.regen_max_retry,
6086 .maxlen = sizeof(int),
6087 .mode = 0644,
6088 .proc_handler = proc_dointvec,
6089 },
6090 {
6091 .procname = "max_desync_factor",
6092 .data = &ipv6_devconf.max_desync_factor,
6093 .maxlen = sizeof(int),
6094 .mode = 0644,
6095 .proc_handler = proc_dointvec,
6096 },
6097 {
6098 .procname = "max_addresses",
6099 .data = &ipv6_devconf.max_addresses,
6100 .maxlen = sizeof(int),
6101 .mode = 0644,
6102 .proc_handler = proc_dointvec,
6103 },
6104 {
6105 .procname = "accept_ra_defrtr",
6106 .data = &ipv6_devconf.accept_ra_defrtr,
6107 .maxlen = sizeof(int),
6108 .mode = 0644,
6109 .proc_handler = proc_dointvec,
6110 },
6111 {
6112 .procname = "accept_ra_min_hop_limit",
6113 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6114 .maxlen = sizeof(int),
6115 .mode = 0644,
6116 .proc_handler = proc_dointvec,
6117 },
6118 {
6119 .procname = "accept_ra_pinfo",
6120 .data = &ipv6_devconf.accept_ra_pinfo,
6121 .maxlen = sizeof(int),
6122 .mode = 0644,
6123 .proc_handler = proc_dointvec,
6124 },
930d6ff2 6125#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 6126 {
6127 .procname = "accept_ra_rtr_pref",
6128 .data = &ipv6_devconf.accept_ra_rtr_pref,
6129 .maxlen = sizeof(int),
6130 .mode = 0644,
6131 .proc_handler = proc_dointvec,
6132 },
6133 {
6134 .procname = "router_probe_interval",
6135 .data = &ipv6_devconf.rtr_probe_interval,
6136 .maxlen = sizeof(int),
6137 .mode = 0644,
6138 .proc_handler = proc_dointvec_jiffies,
6139 },
fa03ef38 6140#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b
JS		 6141 {
6142 .procname = "accept_ra_rt_info_min_plen",
6143 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6144 .maxlen = sizeof(int),
6145 .mode = 0644,
6146 .proc_handler = proc_dointvec,
6147 },
5df1f77f
KK		 6148 {
6149 .procname = "accept_ra_rt_info_max_plen",
6150 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6151 .maxlen = sizeof(int),
6152 .mode = 0644,
6153 .proc_handler = proc_dointvec,
6154 },
09c884d4 6155#endif
930d6ff2 6156#endif
5df1f77f
KK		 6157 {
6158 .procname = "proxy_ndp",
6159 .data = &ipv6_devconf.proxy_ndp,
6160 .maxlen = sizeof(int),
6161 .mode = 0644,
6162 .proc_handler = addrconf_sysctl_proxy_ndp,
6163 },
6164 {
6165 .procname = "accept_source_route",
6166 .data = &ipv6_devconf.accept_source_route,
6167 .maxlen = sizeof(int),
6168 .mode = 0644,
6169 .proc_handler = proc_dointvec,
6170 },
95c385b4 6171#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 6172 {
6173 .procname = "optimistic_dad",
6174 .data = &ipv6_devconf.optimistic_dad,
6175 .maxlen = sizeof(int),
6176 .mode = 0644,
6177 .proc_handler = proc_dointvec,
6178 },
6179 {
6180 .procname = "use_optimistic",
6181 .data = &ipv6_devconf.use_optimistic,
6182 .maxlen = sizeof(int),
6183 .mode = 0644,
6184 .proc_handler = proc_dointvec,
6185 },
7bc570c8
YH		 6186#endif
6187#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 6188 {
6189 .procname = "mc_forwarding",
6190 .data = &ipv6_devconf.mc_forwarding,
6191 .maxlen = sizeof(int),
6192 .mode = 0444,
6193 .proc_handler = proc_dointvec,
6194 },
95c385b4 6195#endif
5df1f77f
KK		 6196 {
6197 .procname = "disable_ipv6",
6198 .data = &ipv6_devconf.disable_ipv6,
6199 .maxlen = sizeof(int),
6200 .mode = 0644,
6201 .proc_handler = addrconf_sysctl_disable,
6202 },
6203 {
6204 .procname = "accept_dad",
6205 .data = &ipv6_devconf.accept_dad,
6206 .maxlen = sizeof(int),
6207 .mode = 0644,
6208 .proc_handler = proc_dointvec,
6209 },
6210 {
6211 .procname = "force_tllao",
6212 .data = &ipv6_devconf.force_tllao,
6213 .maxlen = sizeof(int),
6214 .mode = 0644,
6215 .proc_handler = proc_dointvec
6216 },
6217 {
6218 .procname = "ndisc_notify",
6219 .data = &ipv6_devconf.ndisc_notify,
6220 .maxlen = sizeof(int),
6221 .mode = 0644,
6222 .proc_handler = proc_dointvec
6223 },
6224 {
6225 .procname = "suppress_frag_ndisc",
6226 .data = &ipv6_devconf.suppress_frag_ndisc,
6227 .maxlen = sizeof(int),
6228 .mode = 0644,
6229 .proc_handler = proc_dointvec
6230 },
6231 {
6232 .procname = "accept_ra_from_local",
6233 .data = &ipv6_devconf.accept_ra_from_local,
6234 .maxlen = sizeof(int),
6235 .mode = 0644,
6236 .proc_handler = proc_dointvec,
6237 },
6238 {
6239 .procname = "accept_ra_mtu",
6240 .data = &ipv6_devconf.accept_ra_mtu,
6241 .maxlen = sizeof(int),
6242 .mode = 0644,
6243 .proc_handler = proc_dointvec,
6244 },
6245 {
6246 .procname = "stable_secret",
6247 .data = &ipv6_devconf.stable_secret,
6248 .maxlen = IPV6_MAX_STRLEN,
6249 .mode = 0600,
6250 .proc_handler = addrconf_sysctl_stable_secret,
6251 },
6252 {
6253 .procname = "use_oif_addrs_only",
6254 .data = &ipv6_devconf.use_oif_addrs_only,
6255 .maxlen = sizeof(int),
6256 .mode = 0644,
6257 .proc_handler = proc_dointvec,
6258 },
6259 {
6260 .procname = "ignore_routes_with_linkdown",
6261 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6262 .maxlen = sizeof(int),
6263 .mode = 0644,
6264 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6265 },
6266 {
6267 .procname = "drop_unicast_in_l2_multicast",
6268 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6269 .maxlen = sizeof(int),
6270 .mode = 0644,
6271 .proc_handler = proc_dointvec,
6272 },
6273 {
6274 .procname = "drop_unsolicited_na",
6275 .data = &ipv6_devconf.drop_unsolicited_na,
6276 .maxlen = sizeof(int),
6277 .mode = 0644,
6278 .proc_handler = proc_dointvec,
6279 },
6280 {
6281 .procname = "keep_addr_on_down",
6282 .data = &ipv6_devconf.keep_addr_on_down,
6283 .maxlen = sizeof(int),
6284 .mode = 0644,
6285 .proc_handler = proc_dointvec,
6286
6287 },
1ababeba
DL		 6288 {
6289 .procname = "seg6_enabled",
6290 .data = &ipv6_devconf.seg6_enabled,
6291 .maxlen = sizeof(int),
6292 .mode = 0644,
6293 .proc_handler = proc_dointvec,
6294 },
bf355b8d
DL		 6295#ifdef CONFIG_IPV6_SEG6_HMAC
6296 {
6297 .procname = "seg6_require_hmac",
6298 .data = &ipv6_devconf.seg6_require_hmac,
6299 .maxlen = sizeof(int),
6300 .mode = 0644,
6301 .proc_handler = proc_dointvec,
6302 },
6303#endif
adc176c5
EN		 6304 {
6305 .procname = "enhanced_dad",
6306 .data = &ipv6_devconf.enhanced_dad,
6307 .maxlen = sizeof(int),
6308 .mode = 0644,
6309 .proc_handler = proc_dointvec,
6310 },
d35a00b8
FJ		 6311 {
6312 .procname = "addr_gen_mode",
6313 .data = &ipv6_devconf.addr_gen_mode,
6314 .maxlen = sizeof(int),
6315 .mode = 0644,
6316 .proc_handler = addrconf_sysctl_addr_gen_mode,
6317 },
df789fe7
DF		 6318 {
6319 .procname = "disable_policy",
6320 .data = &ipv6_devconf.disable_policy,
6321 .maxlen = sizeof(int),
6322 .mode = 0644,
6323 .proc_handler = addrconf_sysctl_disable_policy,
6324 },
5df1f77f
KK		 6325 {
6326 /* sentinel */
6327 }
1da177e4
LT		 6328};
6329
bff16c2f 6330static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 6331 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4 6332{
29c994e3 6333 int i, ifindex;
607ea7cd 6334 struct ctl_table *table;
6105e293 6335 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 6336
607ea7cd
KK		 6337 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6338 if (!table)
f68635e6
PE		 6339 goto out;
6340
607ea7cd
KK		 6341 for (i = 0; table[i].data; i++) {
6342 table[i].data += (char *)p - (char *)&ipv6_devconf;
cb9e684e
MŻ		 6343 /* If one of these is already set, then it is not safe to
6344 * overwrite either of them: this makes proc_dointvec_minmax
6345 * usable.
6346 */
6347 if (!table[i].extra1 && !table[i].extra2) {
6348 table[i].extra1 = idev; /* embedded; no ref */
6349 table[i].extra2 = net;
6350 }
1da177e4 6351 }
1da177e4 6352
6105e293 6353 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 6354
607ea7cd
KK		 6355 p->sysctl_header = register_net_sysctl(net, path, table);
6356 if (!p->sysctl_header)
6105e293 6357 goto free;
f68635e6 6358
29c994e3
ND		 6359 if (!strcmp(dev_name, "all"))
6360 ifindex = NETCONFA_IFINDEX_ALL;
6361 else if (!strcmp(dev_name, "default"))
6362 ifindex = NETCONFA_IFINDEX_DEFAULT;
6363 else
6364 ifindex = idev->dev->ifindex;
85b3daad
DA		 6365 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6366 ifindex, p);
95897312 6367 return 0;
1da177e4 6368
f68635e6 6369free:
607ea7cd 6370 kfree(table);
f68635e6 6371out:
95897312 6372 return -ENOBUFS;
1da177e4
LT		 6373}
6374
23452170
DA		 6375static void __addrconf_sysctl_unregister(struct net *net,
6376 struct ipv6_devconf *p, int ifindex)
408c4768 6377{
607ea7cd 6378 struct ctl_table *table;
408c4768 6379
607ea7cd 6380 if (!p->sysctl_header)
408c4768
PE		 6381 return;
6382
607ea7cd
KK		 6383 table = p->sysctl_header->ctl_table_arg;
6384 unregister_net_sysctl_table(p->sysctl_header);
6385 p->sysctl_header = NULL;
6386 kfree(table);
23452170
DA		 6387
6388 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
408c4768
PE		 6389}
6390
a317a2f1 6391static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 6392{
a317a2f1
WC		 6393 int err;
6394
6395 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6396 return -EINVAL;
6397
6398 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6399 &ndisc_ifinfo_sysctl_change);
6400 if (err)
6401 return err;
6402 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6403 idev, &idev->cnf);
6404 if (err)
6405 neigh_sysctl_unregister(idev->nd_parms);
6406
6407 return err;
f52295a9
PE		 6408}
6409
408c4768 6410static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 6411{
23452170
DA		 6412 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6413 idev->dev->ifindex);
408c4768 6414 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 6415}
6416
6417
6418#endif
6419
2c8c1e72 6420static int __net_init addrconf_init_net(struct net *net)
e0da5a48 6421{
a79ca223 6422 int err = -ENOMEM;
e0da5a48
PE		 6423 struct ipv6_devconf *all, *dflt;
6424
a79ca223 6425 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 6426 if (!all)
a79ca223 6427 goto err_alloc_all;
e0da5a48 6428
a79ca223 6429 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 6430 if (!dflt)
a79ca223 6431 goto err_alloc_dflt;
e0da5a48 6432
a79ca223
HZ		 6433 /* these will be inherited by all namespaces */
6434 dflt->autoconf = ipv6_defaults.autoconf;
6435 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 6436
3d1bec99
HFS		 6437 dflt->stable_secret.initialized = false;
6438 all->stable_secret.initialized = false;
6439
e0da5a48
PE		 6440 net->ipv6.devconf_all = all;
6441 net->ipv6.devconf_dflt = dflt;
6442
6443#ifdef CONFIG_SYSCTL
f8572d8f 6444 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 6445 if (err < 0)
6446 goto err_reg_all;
6447
f8572d8f 6448 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 6449 if (err < 0)
6450 goto err_reg_dflt;
6451#endif
6452 return 0;
6453
6454#ifdef CONFIG_SYSCTL
6455err_reg_dflt:
23452170 6456 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
e0da5a48
PE		 6457err_reg_all:
6458 kfree(dflt);
6459#endif
6460err_alloc_dflt:
6461 kfree(all);
6462err_alloc_all:
6463 return err;
6464}
6465
2c8c1e72 6466static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 6467{
6468#ifdef CONFIG_SYSCTL
23452170
DA		 6469 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6470 NETCONFA_IFINDEX_DEFAULT);
6471 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6472 NETCONFA_IFINDEX_ALL);
e0da5a48 6473#endif
73cf0e92 6474 kfree(net->ipv6.devconf_dflt);
6475 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 6476}
6477
6478static struct pernet_operations addrconf_ops = {
6479 .init = addrconf_init_net,
6480 .exit = addrconf_exit_net,
6481};
6482
207895fd 6483static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 6484 .family = AF_INET6,
6485 .fill_link_af = inet6_fill_link_af,
6486 .get_link_af_size = inet6_get_link_af_size,
11b1f828 6487 .validate_link_af = inet6_validate_link_af,
f53adae4 6488 .set_link_af = inet6_set_link_af,
b382b191
TG		 6489};
6490
1da177e4
LT		 6491/*
6492 * Init / cleanup code
6493 */
6494
6495int __init addrconf_init(void)
6496{
a317a2f1 6497 struct inet6_dev *idev;
c2e21293 6498 int i, err;
2a8cc6c8 6499
e21e8467
SH		 6500 err = ipv6_addr_label_init();
6501 if (err < 0) {
f3213831
JP		 6502 pr_crit("%s: cannot initialize default policy table: %d\n",
6503 __func__, err);
2cc6d2bf 6504 goto out;
2a8cc6c8 6505 }
1da177e4 6506
2cc6d2bf
NH		 6507 err = register_pernet_subsys(&addrconf_ops);
6508 if (err < 0)
6509 goto out_addrlabel;
e0da5a48 6510
c15b1cca
HFS		 6511 addrconf_wq = create_workqueue("ipv6_addrconf");
6512 if (!addrconf_wq) {
6513 err = -ENOMEM;
6514 goto out_nowq;
6515 }
6516
1da177e4
LT		 6517 /* The addrconf netdev notifier requires that loopback_dev
6518 * has it's ipv6 private information allocated and setup
6519 * before it can bring up and give link-local addresses
6520 * to other devices which are up.
6521 *
6522 * Unfortunately, loopback_dev is not necessarily the first
6523 * entry in the global dev_base list of net devices. In fact,
6524 * it is likely to be the very last entry on that list.
6525 * So this causes the notifier registry below to try and
6526 * give link-local addresses to all devices besides loopback_dev
6527 * first, then loopback_dev, which cases all the non-loopback_dev
6528 * devices to fail to get a link-local address.
6529 *
6530 * So, as a temporary fix, allocate the ipv6 structure for
6531 * loopback_dev first by hand.
6532 * Longer term, all of the dependencies ipv6 has upon the loopback
6533 * device and it being up should be removed.
6534 */
6535 rtnl_lock();
a317a2f1 6536 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 6537 rtnl_unlock();
a317a2f1
WC		 6538 if (IS_ERR(idev)) {
6539 err = PTR_ERR(idev);
e0da5a48 6540 goto errlo;
a317a2f1 6541 }
1da177e4 6542
c2e21293 6543 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6544 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6545
1da177e4
LT		 6546 register_netdevice_notifier(&ipv6_dev_notf);
6547
c15b1cca 6548 addrconf_verify();
c127ea2c 6549
3678a9d8 6550 rtnl_af_register(&inet6_ops);
b382b191 6551
c7ac8679
GR		 6552 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6553 NULL);
c127ea2c
TG		 6554 if (err < 0)
6555 goto errout;
6556
6557 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 6558 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6559 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6560 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6561 inet6_dump_ifaddr, NULL);
6562 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6563 inet6_dump_ifmcaddr, NULL);
6564 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6565 inet6_dump_ifacaddr, NULL);
76f8f6cb 6566 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 6567 inet6_netconf_dump_devconf, NULL);
c127ea2c 6568
2a8cc6c8
YH		 6569 ipv6_addr_label_rtnl_register();
6570
1da177e4 6571 return 0;
c127ea2c 6572errout:
b382b191 6573 rtnl_af_unregister(&inet6_ops);
c127ea2c 6574 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6575errlo:
c15b1cca
HFS		 6576 destroy_workqueue(addrconf_wq);
6577out_nowq:
e0da5a48 6578 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 6579out_addrlabel:
6580 ipv6_addr_label_cleanup();
6581out:
c127ea2c 6582 return err;
1da177e4
LT		 6583}
6584
09f7709f 6585void addrconf_cleanup(void)
1da177e4 6586{
176c39af 6587 struct net_device *dev;
1da177e4
LT		 6588 int i;
6589
6590 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6591 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 6592 ipv6_addr_label_cleanup();
1da177e4
LT		 6593
6594 rtnl_lock();
6595
b382b191
TG		 6596 __rtnl_af_unregister(&inet6_ops);
6597
176c39af
DL		 6598 /* clean dev list */
6599 for_each_netdev(&init_net, dev) {
6600 if (__in6_dev_get(dev) == NULL)
6601 continue;
6602 addrconf_ifdown(dev, 1);
6603 }
6604 addrconf_ifdown(init_net.loopback_dev, 2);
6605
1da177e4
LT		 6606 /*
6607 * Check hash table.
6608 */
5c578aed 6609 spin_lock_bh(&addrconf_hash_lock);
c2e21293 6610 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6611 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 6612 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 6613 cancel_delayed_work(&addr_chk_work);
1da177e4 6614 rtnl_unlock();
c15b1cca
HFS		 6615
6616 destroy_workqueue(addrconf_wq);
1da177e4 6617}
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