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6lowpan: Use netdev addr_len to determine lladdr len
[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
8a7a4b47 2076static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
06a4c1c5 2077{
8a7a4b47
AA		 2078 switch (dev->addr_len) {
2079 case ETH_ALEN:
2080 return addrconf_ifid_eui48(eui, dev);
2081 case EUI64_ADDR_LEN:
2082 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2083 eui[0] ^= 2;
2084 break;
2085 default:
06a4c1c5 2086 return -1;
8a7a4b47
AA		 2087 }
2088
06a4c1c5 2089 return 0;
2090}
2091
cb6bf355
YH		 2092static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2093{
2094 union fwnet_hwaddr *ha;
2095
2096 if (dev->addr_len != FWNET_ALEN)
2097 return -1;
2098
2099 ha = (union fwnet_hwaddr *)dev->dev_addr;
2100
2101 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2102 eui[0] ^= 2;
2103 return 0;
2104}
2105
073a8e0e
YH		 2106static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2107{
2108 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2109 if (dev->addr_len != ARCNET_ALEN)
2110 return -1;
2111 memset(eui, 0, 7);
8e5e8f30 2112 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 2113 return 0;
2114}
2115
2116static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2117{
2118 if (dev->addr_len != INFINIBAND_ALEN)
2119 return -1;
2120 memcpy(eui, dev->dev_addr + 12, 8);
2121 eui[0] |= 2;
2122 return 0;
2123}
2124
c61393ea 2125static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2126{
9af28511
SH		 2127 if (addr == 0)
2128 return -1;
dfd982ba
YH		 2129 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2130 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2131 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2132 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2133 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2134 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2135 eui[1] = 0;
2136 eui[2] = 0x5E;
2137 eui[3] = 0xFE;
2138 memcpy(eui + 4, &addr, 4);
2139 return 0;
2140}
dfd982ba
YH		 2141
2142static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2143{
2144 if (dev->priv_flags & IFF_ISATAP)
2145 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2146 return -1;
2147}
2148
aee80b54 2149static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2150{
2151 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2152}
2153
e837735e
ND		 2154static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2155{
2156 memcpy(eui, dev->perm_addr, 3);
2157 memcpy(eui + 5, dev->perm_addr + 3, 3);
2158 eui[3] = 0xFF;
2159 eui[4] = 0xFE;
2160 eui[0] ^= 2;
2161 return 0;
2162}
2163
1da177e4
LT		 2164static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2165{
2166 switch (dev->type) {
2167 case ARPHRD_ETHER:
2168 case ARPHRD_FDDI:
073a8e0e 2169 return addrconf_ifid_eui48(eui, dev);
1da177e4 2170 case ARPHRD_ARCNET:
073a8e0e 2171 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2172 case ARPHRD_INFINIBAND:
073a8e0e 2173 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2174 case ARPHRD_SIT:
dfd982ba 2175 return addrconf_ifid_sit(eui, dev);
aee80b54 2176 case ARPHRD_IPGRE:
45ce0fd1 2177 case ARPHRD_TUNNEL:
aee80b54 2178 return addrconf_ifid_gre(eui, dev);
e74bccb8 2179 case ARPHRD_6LOWPAN:
8a7a4b47 2180 return addrconf_ifid_6lowpan(eui, dev);
cb6bf355
YH		 2181 case ARPHRD_IEEE1394:
2182 return addrconf_ifid_ieee1394(eui, dev);
e837735e 2183 case ARPHRD_TUNNEL6:
45ce0fd1 2184 case ARPHRD_IP6GRE:
e837735e 2185 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2186 }
2187 return -1;
2188}
2189
2190static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2191{
2192 int err = -1;
2193 struct inet6_ifaddr *ifp;
2194
2195 read_lock_bh(&idev->lock);
602582ca
HFS		 2196 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2197 if (ifp->scope > IFA_LINK)
2198 break;
1da177e4
LT		 2199 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2200 memcpy(eui, ifp->addr.s6_addr+8, 8);
2201 err = 0;
2202 break;
2203 }
2204 }
2205 read_unlock_bh(&idev->lock);
2206 return err;
2207}
2208
1da177e4 2209/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
9d6280da 2210static void ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2211{
1da177e4 2212regen:
955189ef 2213 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2214 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2215
2216 /*
2217 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2218 * check if generated address is not inappropriate
2219 *
2220 * - Reserved subnet anycast (RFC 2526)
2221 * 11111101 11....11 1xxxxxxx
c7dc89c0 2222 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2223 * 00-00-5E-FE-xx-xx-xx-xx
2224 * - value 0
2225 * - XXX: already assigned to an address on the device
2226 */
1ab1457c 2227 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2228 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2229 (idev->rndid[7]&0x80))
2230 goto regen;
2231 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2232 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2233 goto regen;
2234 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2235 goto regen;
2236 }
1da177e4
LT		 2237}
2238
9d6280da 2239static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2240{
1da177e4 2241 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
9d6280da 2242 ipv6_regen_rndid(idev);
1da177e4 2243}
1da177e4
LT		 2244
2245/*
2246 * Add prefix route.
2247 */
2248
2249static void
2250addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2251 unsigned long expires, u32 flags)
1da177e4 2252{
86872cb5 2253 struct fib6_config cfg = {
ca254490 2254 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
86872cb5
TG		 2255 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2256 .fc_ifindex = dev->ifindex,
2257 .fc_expires = expires,
2258 .fc_dst_len = plen,
2259 .fc_flags = RTF_UP | flags,
c346dca1 2260 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2261 .fc_protocol = RTPROT_KERNEL,
86872cb5 2262 };
1da177e4 2263
4e3fd7a0 2264 cfg.fc_dst = *pfx;
1da177e4
LT		 2265
2266 /* Prevent useless cloning on PtP SIT.
2267 This thing is done here expecting that the whole
2268 class of non-broadcast devices need not cloning.
2269 */
07a93626 2270#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2271 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2272 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2273#endif
1da177e4 2274
86872cb5 2275 ip6_route_add(&cfg);
1da177e4
LT		 2276}
2277
14ef37b6
AH		 2278
2279static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2280 int plen,
2281 const struct net_device *dev,
2282 u32 flags, u32 noflags)
2283{
2284 struct fib6_node *fn;
2285 struct rt6_info *rt = NULL;
2286 struct fib6_table *table;
ca254490 2287 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2288
ca254490 2289 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2290 if (!table)
14ef37b6
AH		 2291 return NULL;
2292
5744dd9b 2293 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2294 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2295 if (!fn)
2296 goto out;
1f56a01f
MKL		 2297
2298 noflags |= RTF_CACHE;
14ef37b6 2299 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2300 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2301 continue;
2302 if ((rt->rt6i_flags & flags) != flags)
2303 continue;
85da53bf 2304 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2305 continue;
2306 dst_hold(&rt->dst);
2307 break;
2308 }
2309out:
5744dd9b 2310 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2311 return rt;
2312}
2313
2314
1da177e4
LT		 2315/* Create "default" multicast route to the interface */
2316
2317static void addrconf_add_mroute(struct net_device *dev)
2318{
86872cb5 2319 struct fib6_config cfg = {
ca254490 2320 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2321 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2322 .fc_ifindex = dev->ifindex,
2323 .fc_dst_len = 8,
2324 .fc_flags = RTF_UP,
c346dca1 2325 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2326 };
2327
2328 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2329
2330 ip6_route_add(&cfg);
1da177e4
LT		 2331}
2332
1da177e4
LT		 2333static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2334{
2335 struct inet6_dev *idev;
2336
2337 ASSERT_RTNL();
2338
e21e8467
SH		 2339 idev = ipv6_find_idev(dev);
2340 if (!idev)
64e724f6
BH		 2341 return ERR_PTR(-ENOBUFS);
2342
2343 if (idev->cnf.disable_ipv6)
2344 return ERR_PTR(-EACCES);
1da177e4
LT		 2345
2346 /* Add default multicast route */
ba46ee4c 2347 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
4af04aba 2348 addrconf_add_mroute(dev);
1da177e4 2349
1da177e4
LT		 2350 return idev;
2351}
2352
53bd6749
JP		 2353static void manage_tempaddrs(struct inet6_dev *idev,
2354 struct inet6_ifaddr *ifp,
2355 __u32 valid_lft, __u32 prefered_lft,
2356 bool create, unsigned long now)
2357{
2358 u32 flags;
2359 struct inet6_ifaddr *ift;
2360
2361 read_lock_bh(&idev->lock);
2362 /* update all temporary addresses in the list */
2363 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2364 int age, max_valid, max_prefered;
2365
2366 if (ifp != ift->ifpub)
2367 continue;
2368
2369 /* RFC 4941 section 3.3:
2370 * If a received option will extend the lifetime of a public
2371 * address, the lifetimes of temporary addresses should
2372 * be extended, subject to the overall constraint that no
2373 * temporary addresses should ever remain "valid" or "preferred"
2374 * for a time longer than (TEMP_VALID_LIFETIME) or
2375 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2376 */
2377 age = (now - ift->cstamp) / HZ;
2378 max_valid = idev->cnf.temp_valid_lft - age;
2379 if (max_valid < 0)
2380 max_valid = 0;
2381
2382 max_prefered = idev->cnf.temp_prefered_lft -
76506a98 2383 idev->desync_factor - age;
53bd6749
JP		 2384 if (max_prefered < 0)
2385 max_prefered = 0;
2386
2387 if (valid_lft > max_valid)
2388 valid_lft = max_valid;
2389
2390 if (prefered_lft > max_prefered)
2391 prefered_lft = max_prefered;
2392
2393 spin_lock(&ift->lock);
2394 flags = ift->flags;
2395 ift->valid_lft = valid_lft;
2396 ift->prefered_lft = prefered_lft;
2397 ift->tstamp = now;
2398 if (prefered_lft > 0)
2399 ift->flags &= ~IFA_F_DEPRECATED;
2400
2401 spin_unlock(&ift->lock);
2402 if (!(flags&IFA_F_TENTATIVE))
2403 ipv6_ifa_notify(0, ift);
2404 }
2405
2406 if ((create || list_empty(&idev->tempaddr_list)) &&
2407 idev->cnf.use_tempaddr > 0) {
2408 /* When a new public address is created as described
2409 * in [ADDRCONF], also create a new temporary address.
2410 * Also create a temporary address if it's enabled but
2411 * no temporary address currently exists.
2412 */
2413 read_unlock_bh(&idev->lock);
2414 ipv6_create_tempaddr(ifp, NULL);
2415 } else {
2416 read_unlock_bh(&idev->lock);
2417 }
2418}
2419
cc9da6cc
BM		 2420static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2421{
d35a00b8
FJ		 2422 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2423 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc
BM		 2424}
2425
cc84b3c6
AA		 2426int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2427 const struct prefix_info *pinfo,
2428 struct inet6_dev *in6_dev,
2429 const struct in6_addr *addr, int addr_type,
2430 u32 addr_flags, bool sllao, bool tokenized,
2431 __u32 valid_lft, u32 prefered_lft)
4f672235
AA		 2432{
2433 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2434 int create = 0, update_lft = 0;
2435
2436 if (!ifp && valid_lft) {
2437 int max_addresses = in6_dev->cnf.max_addresses;
2438
2439#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2440 if (in6_dev->cnf.optimistic_dad &&
2441 !net->ipv6.devconf_all->forwarding && sllao)
2442 addr_flags |= IFA_F_OPTIMISTIC;
2443#endif
2444
2445 /* Do not allow to create too much of autoconfigured
2446 * addresses; this would be too easy way to crash kernel.
2447 */
2448 if (!max_addresses ||
2449 ipv6_count_addresses(in6_dev) < max_addresses)
2450 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2451 pinfo->prefix_len,
2452 addr_type&IPV6_ADDR_SCOPE_MASK,
2453 addr_flags, valid_lft,
2454 prefered_lft);
2455
2456 if (IS_ERR_OR_NULL(ifp))
2457 return -1;
2458
2459 update_lft = 0;
2460 create = 1;
2461 spin_lock_bh(&ifp->lock);
2462 ifp->flags |= IFA_F_MANAGETEMPADDR;
2463 ifp->cstamp = jiffies;
2464 ifp->tokenized = tokenized;
2465 spin_unlock_bh(&ifp->lock);
2466 addrconf_dad_start(ifp);
2467 }
2468
2469 if (ifp) {
2470 u32 flags;
2471 unsigned long now;
2472 u32 stored_lft;
2473
2474 /* update lifetime (RFC2462 5.5.3 e) */
2475 spin_lock_bh(&ifp->lock);
2476 now = jiffies;
2477 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2478 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2479 else
2480 stored_lft = 0;
2481 if (!update_lft && !create && stored_lft) {
2482 const u32 minimum_lft = min_t(u32,
2483 stored_lft, MIN_VALID_LIFETIME);
2484 valid_lft = max(valid_lft, minimum_lft);
2485
2486 /* RFC4862 Section 5.5.3e:
2487 * "Note that the preferred lifetime of the
2488 * corresponding address is always reset to
2489 * the Preferred Lifetime in the received
2490 * Prefix Information option, regardless of
2491 * whether the valid lifetime is also reset or
2492 * ignored."
2493 *
2494 * So we should always update prefered_lft here.
2495 */
2496 update_lft = 1;
2497 }
2498
2499 if (update_lft) {
2500 ifp->valid_lft = valid_lft;
2501 ifp->prefered_lft = prefered_lft;
2502 ifp->tstamp = now;
2503 flags = ifp->flags;
2504 ifp->flags &= ~IFA_F_DEPRECATED;
2505 spin_unlock_bh(&ifp->lock);
2506
2507 if (!(flags&IFA_F_TENTATIVE))
2508 ipv6_ifa_notify(0, ifp);
2509 } else
2510 spin_unlock_bh(&ifp->lock);
2511
2512 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2513 create, now);
2514
2515 in6_ifa_put(ifp);
2516 addrconf_verify();
2517 }
2518
2519 return 0;
2520}
cc84b3c6 2521EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
4f672235 2522
e6bff995 2523void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2524{
2525 struct prefix_info *pinfo;
2526 __u32 valid_lft;
2527 __u32 prefered_lft;
4f672235 2528 int addr_type, err;
64236f3f 2529 u32 addr_flags = 0;
1da177e4 2530 struct inet6_dev *in6_dev;
56d417b1 2531 struct net *net = dev_net(dev);
1da177e4
LT		 2532
2533 pinfo = (struct prefix_info *) opt;
1ab1457c 2534
1da177e4 2535 if (len < sizeof(struct prefix_info)) {
ba3542e1 2536 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2537 return;
2538 }
1ab1457c 2539
1da177e4
LT		 2540 /*
2541 * Validation checks ([ADDRCONF], page 19)
2542 */
2543
2544 addr_type = ipv6_addr_type(&pinfo->prefix);
2545
2546 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2547 return;
2548
2549 valid_lft = ntohl(pinfo->valid);
2550 prefered_lft = ntohl(pinfo->prefered);
2551
2552 if (prefered_lft > valid_lft) {
e87cc472 2553 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2554 return;
2555 }
2556
2557 in6_dev = in6_dev_get(dev);
2558
63159f29 2559 if (!in6_dev) {
e87cc472
JP		 2560 net_dbg_ratelimited("addrconf: device %s not configured\n",
2561 dev->name);
1da177e4
LT		 2562 return;
2563 }
2564
2565 /*
2566 * Two things going on here:
2567 * 1) Add routes for on-link prefixes
2568 * 2) Configure prefixes with the auto flag set
2569 */
2570
4bed72e4
YH		 2571 if (pinfo->onlink) {
2572 struct rt6_info *rt;
2573 unsigned long rt_expires;
2574
6f704992
YH		 2575 /* Avoid arithmetic overflow. Really, we could
2576 * save rt_expires in seconds, likely valid_lft,
2577 * but it would require division in fib gc, that it
2578 * not good.
2579 */
4bed72e4
YH		 2580 if (HZ > USER_HZ)
2581 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2582 else
2583 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2584
4bed72e4
YH		 2585 if (addrconf_finite_timeout(rt_expires))
2586 rt_expires *= HZ;
1da177e4 2587
14ef37b6
AH		 2588 rt = addrconf_get_prefix_route(&pinfo->prefix,
2589 pinfo->prefix_len,
2590 dev,
2591 RTF_ADDRCONF | RTF_PREFIX_RT,
2592 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2593
14ef37b6 2594 if (rt) {
6f704992
YH		 2595 /* Autoconf prefix route */
2596 if (valid_lft == 0) {
2597 ip6_del_rt(rt);
2598 rt = NULL;
4bed72e4 2599 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2600 /* not infinity */
1716a961 2601 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2602 } else {
1716a961 2603 rt6_clean_expires(rt);
1da177e4
LT		 2604 }
2605 } else if (valid_lft) {
6f704992 2606 clock_t expires = 0;
4bed72e4
YH		 2607 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2608 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2609 /* not infinity */
2610 flags |= RTF_EXPIRES;
2611 expires = jiffies_to_clock_t(rt_expires);
2612 }
1da177e4 2613 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2614 dev, expires, flags);
1da177e4 2615 }
94e187c0 2616 ip6_rt_put(rt);
1da177e4
LT		 2617 }
2618
2619 /* Try to figure out our local address for this prefix */
2620
2621 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1da177e4 2622 struct in6_addr addr;
f997c55c 2623 bool tokenized = false, dev_addr_generated = false;
1da177e4
LT		 2624
2625 if (pinfo->prefix_len == 64) {
2626 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2627
2628 if (!ipv6_addr_any(&in6_dev->token)) {
2629 read_lock_bh(&in6_dev->lock);
2630 memcpy(addr.s6_addr + 8,
2631 in6_dev->token.s6_addr + 8, 8);
2632 read_unlock_bh(&in6_dev->lock);
617fe29d 2633 tokenized = true;
cc9da6cc 2634 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2635 !ipv6_generate_stable_address(&addr, 0,
2636 in6_dev)) {
64236f3f 2637 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2638 goto ok;
f53adae4
DB		 2639 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2640 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
4f672235 2641 goto put;
f997c55c
AA		 2642 } else {
2643 dev_addr_generated = true;
1da177e4
LT		 2644 }
2645 goto ok;
2646 }
e87cc472
JP		 2647 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2648 pinfo->prefix_len);
4f672235 2649 goto put;
1da177e4
LT		 2650
2651ok:
4f672235
AA		 2652 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2653 &addr, addr_type,
2654 addr_flags, sllao,
2655 tokenized, valid_lft,
2656 prefered_lft);
2657 if (err)
2658 goto put;
f997c55c
AA		 2659
2660 /* Ignore error case here because previous prefix add addr was
2661 * successful which will be notified.
2662 */
2663 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2664 addr_type, addr_flags, sllao,
2665 tokenized, valid_lft,
2666 prefered_lft,
2667 dev_addr_generated);
1da177e4
LT		 2668 }
2669 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
4f672235 2670put:
1da177e4
LT		 2671 in6_dev_put(in6_dev);
2672}
2673
2674/*
2675 * Set destination address.
2676 * Special case for SIT interfaces where we create a new "virtual"
2677 * device.
2678 */
af284937 2679int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2680{
2681 struct in6_ifreq ireq;
2682 struct net_device *dev;
2683 int err = -EINVAL;
2684
2685 rtnl_lock();
2686
2687 err = -EFAULT;
2688 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2689 goto err_exit;
2690
af284937 2691 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2692
2693 err = -ENODEV;
63159f29 2694 if (!dev)
1da177e4
LT		 2695 goto err_exit;
2696
07a93626 2697#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2698 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2699 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2700 struct ifreq ifr;
1da177e4
LT		 2701 struct ip_tunnel_parm p;
2702
2703 err = -EADDRNOTAVAIL;
2704 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2705 goto err_exit;
2706
2707 memset(&p, 0, sizeof(p));
2708 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2709 p.iph.saddr = 0;
2710 p.iph.version = 4;
2711 p.iph.ihl = 5;
2712 p.iph.protocol = IPPROTO_IPV6;
2713 p.iph.ttl = 64;
d20b3109 2714 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2715
5bc3eb7e
SH		 2716 if (ops->ndo_do_ioctl) {
2717 mm_segment_t oldfs = get_fs();
2718
2719 set_fs(KERNEL_DS);
2720 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2721 set_fs(oldfs);
2722 } else
2723 err = -EOPNOTSUPP;
1da177e4
LT		 2724
2725 if (err == 0) {
2726 err = -ENOBUFS;
af284937
DL		 2727 dev = __dev_get_by_name(net, p.name);
2728 if (!dev)
1da177e4
LT		 2729 goto err_exit;
2730 err = dev_open(dev);
2731 }
2732 }
0be669bb 2733#endif
1da177e4
LT		 2734
2735err_exit:
2736 rtnl_unlock();
2737 return err;
2738}
2739
93a714d6
MC		 2740static int ipv6_mc_config(struct sock *sk, bool join,
2741 const struct in6_addr *addr, int ifindex)
2742{
2743 int ret;
2744
2745 ASSERT_RTNL();
2746
2747 lock_sock(sk);
2748 if (join)
54ff9ef3 2749 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2750 else
54ff9ef3 2751 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2752 release_sock(sk);
2753
2754 return ret;
2755}
2756
1da177e4
LT		 2757/*
2758 * Manual configuration of address on an interface
2759 */
479840ff
JP		 2760static int inet6_addr_add(struct net *net, int ifindex,
2761 const struct in6_addr *pfx,
caeaba79 2762 const struct in6_addr *peer_pfx,
479840ff
JP		 2763 unsigned int plen, __u32 ifa_flags,
2764 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2765{
2766 struct inet6_ifaddr *ifp;
2767 struct inet6_dev *idev;
2768 struct net_device *dev;
93a714d6
MC		 2769 unsigned long timeout;
2770 clock_t expires;
1da177e4 2771 int scope;
6f704992 2772 u32 flags;
1da177e4
LT		 2773
2774 ASSERT_RTNL();
1ab1457c 2775
24ef0da7
TG		 2776 if (plen > 128)
2777 return -EINVAL;
2778
0778769d
NT		 2779 /* check the lifetime */
2780 if (!valid_lft || prefered_lft > valid_lft)
2781 return -EINVAL;
2782
53bd6749
JP		 2783 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2784 return -EINVAL;
2785
af284937
DL		 2786 dev = __dev_get_by_index(net, ifindex);
2787 if (!dev)
1da177e4 2788 return -ENODEV;
1ab1457c 2789
64e724f6
BH		 2790 idev = addrconf_add_dev(dev);
2791 if (IS_ERR(idev))
2792 return PTR_ERR(idev);
1da177e4 2793
93a714d6
MC		 2794 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2795 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2796 true, pfx, ifindex);
2797
2798 if (ret < 0)
2799 return ret;
2800 }
2801
1da177e4
LT		 2802 scope = ipv6_addr_scope(pfx);
2803
4bed72e4
YH		 2804 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2805 if (addrconf_finite_timeout(timeout)) {
2806 expires = jiffies_to_clock_t(timeout * HZ);
2807 valid_lft = timeout;
6f704992 2808 flags = RTF_EXPIRES;
4bed72e4
YH		 2809 } else {
2810 expires = 0;
2811 flags = 0;
2812 ifa_flags |= IFA_F_PERMANENT;
6f704992 2813 }
0778769d 2814
4bed72e4
YH		 2815 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2816 if (addrconf_finite_timeout(timeout)) {
2817 if (timeout == 0)
2818 ifa_flags |= IFA_F_DEPRECATED;
2819 prefered_lft = timeout;
2820 }
0778769d 2821
8a226b2c
JB		 2822 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2823 valid_lft, prefered_lft);
0778769d 2824
1da177e4 2825 if (!IS_ERR(ifp)) {
761aac73
TH		 2826 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2827 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2828 expires, flags);
2829 }
2830
95c385b4
NH		 2831 /*
2832 * Note that section 3.1 of RFC 4429 indicates
2833 * that the Optimistic flag should not be set for
2834 * manually configured addresses
2835 */
cf22f9a2 2836 addrconf_dad_start(ifp);
53bd6749
JP		 2837 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2838 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2839 true, jiffies);
1da177e4 2840 in6_ifa_put(ifp);
c15b1cca 2841 addrconf_verify_rtnl();
1da177e4 2842 return 0;
93a714d6
MC		 2843 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2844 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2845 false, pfx, ifindex);
1da177e4
LT		 2846 }
2847
2848 return PTR_ERR(ifp);
2849}
2850
6046d5b4
HK		 2851static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2852 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2853{
2854 struct inet6_ifaddr *ifp;
2855 struct inet6_dev *idev;
2856 struct net_device *dev;
1ab1457c 2857
24ef0da7
TG		 2858 if (plen > 128)
2859 return -EINVAL;
2860
af284937
DL		 2861 dev = __dev_get_by_index(net, ifindex);
2862 if (!dev)
1da177e4
LT		 2863 return -ENODEV;
2864
e5d08d71 2865 idev = __in6_dev_get(dev);
63159f29 2866 if (!idev)
1da177e4
LT		 2867 return -ENXIO;
2868
2869 read_lock_bh(&idev->lock);
502a2ffd 2870 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2871 if (ifp->prefix_len == plen &&
2872 ipv6_addr_equal(pfx, &ifp->addr)) {
2873 in6_ifa_hold(ifp);
2874 read_unlock_bh(&idev->lock);
1ab1457c 2875
6046d5b4
HK		 2876 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2877 (ifa_flags & IFA_F_MANAGETEMPADDR))
2878 manage_tempaddrs(idev, ifp, 0, 0, false,
2879 jiffies);
1da177e4 2880 ipv6_del_addr(ifp);
6046d5b4 2881 addrconf_verify_rtnl();
93a714d6
MC		 2882 if (ipv6_addr_is_multicast(pfx)) {
2883 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2884 false, pfx, dev->ifindex);
2885 }
1da177e4
LT		 2886 return 0;
2887 }
2888 }
2889 read_unlock_bh(&idev->lock);
2890 return -EADDRNOTAVAIL;
2891}
2892
2893
af284937 2894int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2895{
2896 struct in6_ifreq ireq;
2897 int err;
1ab1457c 2898
af31f412 2899 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2900 return -EPERM;
1ab1457c 2901
1da177e4
LT		 2902 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2903 return -EFAULT;
2904
2905 rtnl_lock();
caeaba79 2906 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2907 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2908 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2909 rtnl_unlock();
2910 return err;
2911}
2912
af284937 2913int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2914{
2915 struct in6_ifreq ireq;
2916 int err;
1ab1457c 2917
af31f412 2918 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2919 return -EPERM;
2920
2921 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2922 return -EFAULT;
2923
2924 rtnl_lock();
6046d5b4 2925 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2926 ireq.ifr6_prefixlen);
1da177e4
LT		 2927 rtnl_unlock();
2928 return err;
2929}
2930
b5f348e5
IJ		 2931static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2932 int plen, int scope)
2933{
2934 struct inet6_ifaddr *ifp;
2935
8a226b2c 2936 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2937 scope, IFA_F_PERMANENT,
2938 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2939 if (!IS_ERR(ifp)) {
2940 spin_lock_bh(&ifp->lock);
2941 ifp->flags &= ~IFA_F_TENTATIVE;
2942 spin_unlock_bh(&ifp->lock);
764d3be6 2943 rt_genid_bump_ipv6(dev_net(idev->dev));
b5f348e5
IJ		 2944 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2945 in6_ifa_put(ifp);
2946 }
2947}
2948
07a93626 2949#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2950static void sit_add_v4_addrs(struct inet6_dev *idev)
2951{
1da177e4
LT		 2952 struct in6_addr addr;
2953 struct net_device *dev;
c346dca1 2954 struct net *net = dev_net(idev->dev);
929c9cf3 2955 int scope, plen;
f0e2acfa 2956 u32 pflags = 0;
1da177e4
LT		 2957
2958 ASSERT_RTNL();
2959
2960 memset(&addr, 0, sizeof(struct in6_addr));
2961 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2962
2963 if (idev->dev->flags&IFF_POINTOPOINT) {
2964 addr.s6_addr32[0] = htonl(0xfe800000);
2965 scope = IFA_LINK;
929c9cf3 2966 plen = 64;
1da177e4
LT		 2967 } else {
2968 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2969 plen = 96;
f0e2acfa 2970 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2971 }
2972
2973 if (addr.s6_addr32[3]) {
929c9cf3 2974 add_addr(idev, &addr, plen, scope);
f0e2acfa 2975 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2976 return;
2977 }
2978
6fda7350 2979 for_each_netdev(net, dev) {
8e5e8f30 2980 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2981 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2982 struct in_ifaddr *ifa;
1da177e4
LT		 2983
2984 int flag = scope;
2985
2986 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2987
2988 addr.s6_addr32[3] = ifa->ifa_local;
2989
2990 if (ifa->ifa_scope == RT_SCOPE_LINK)
2991 continue;
2992 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2993 if (idev->dev->flags&IFF_POINTOPOINT)
2994 continue;
2995 flag |= IFA_HOST;
2996 }
1da177e4 2997
b5f348e5 2998 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2999 addrconf_prefix_route(&addr, plen, idev->dev, 0,
3000 pflags);
1da177e4
LT		 3001 }
3002 }
1ab1457c 3003 }
1da177e4 3004}
0be669bb 3005#endif
1da177e4
LT		 3006
3007static void init_loopback(struct net_device *dev)
3008{
3009 struct inet6_dev *idev;
25fb6ca4
BK		 3010 struct net_device *sp_dev;
3011 struct inet6_ifaddr *sp_ifa;
3012 struct rt6_info *sp_rt;
1da177e4
LT		 3013
3014 /* ::1 */
3015
3016 ASSERT_RTNL();
3017
e5d08d71 3018 idev = ipv6_find_idev(dev);
63159f29 3019 if (!idev) {
91df42be 3020 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3021 return;
3022 }
3023
b5f348e5 3024 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 3025
3026 /* Add routes to other interface's IPv6 addresses */
3027 for_each_netdev(dev_net(dev), sp_dev) {
3028 if (!strcmp(sp_dev->name, dev->name))
3029 continue;
3030
3031 idev = __in6_dev_get(sp_dev);
3032 if (!idev)
3033 continue;
3034
3035 read_lock_bh(&idev->lock);
3036 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
3037
3038 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
3039 continue;
3040
33d99113
G		 3041 if (sp_ifa->rt) {
3042 /* This dst has been added to garbage list when
3043 * lo device down, release this obsolete dst and
3044 * reallocate a new router for ifa.
3045 */
a220445f 3046 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
33d99113
G		 3047 ip6_rt_put(sp_ifa->rt);
3048 sp_ifa->rt = NULL;
3049 } else {
3050 continue;
3051 }
3052 }
a881ae1f 3053
57ec0afe 3054 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 3055
3056 /* Failure cases are ignored */
534c8779
G		 3057 if (!IS_ERR(sp_rt)) {
3058 sp_ifa->rt = sp_rt;
25fb6ca4 3059 ip6_ins_rt(sp_rt);
534c8779 3060 }
25fb6ca4
BK		 3061 }
3062 read_unlock_bh(&idev->lock);
3063 }
1da177e4
LT		 3064}
3065
2ad3ed59
AA		 3066void addrconf_add_linklocal(struct inet6_dev *idev,
3067 const struct in6_addr *addr, u32 flags)
1da177e4 3068{
8e5e8f30 3069 struct inet6_ifaddr *ifp;
64236f3f 3070 u32 addr_flags = flags | IFA_F_PERMANENT;
95c385b4
NH		 3071
3072#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3073 if (idev->cnf.optimistic_dad &&
702beb87 3074 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 3075 addr_flags |= IFA_F_OPTIMISTIC;
3076#endif
1da177e4 3077
07edd741
HFS		 3078 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3079 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 3080 if (!IS_ERR(ifp)) {
46d48046 3081 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 3082 addrconf_dad_start(ifp);
1da177e4
LT		 3083 in6_ifa_put(ifp);
3084 }
3085}
2ad3ed59 3086EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
1da177e4 3087
622c81d5
HFS		 3088static bool ipv6_reserved_interfaceid(struct in6_addr address)
3089{
3090 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3091 return true;
3092
3093 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3094 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3095 return true;
3096
3097 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3098 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3099 return true;
3100
3101 return false;
3102}
3103
3104static int ipv6_generate_stable_address(struct in6_addr *address,
3105 u8 dad_count,
3106 const struct inet6_dev *idev)
3107{
622c81d5
HFS		 3108 static DEFINE_SPINLOCK(lock);
3109 static __u32 digest[SHA_DIGEST_WORDS];
3110 static __u32 workspace[SHA_WORKSPACE_WORDS];
3111
3112 static union {
3113 char __data[SHA_MESSAGE_BYTES];
3114 struct {
3115 struct in6_addr secret;
ff40217e 3116 __be32 prefix[2];
622c81d5
HFS		 3117 unsigned char hwaddr[MAX_ADDR_LEN];
3118 u8 dad_count;
3119 } __packed;
3120 } data;
3121
3122 struct in6_addr secret;
3123 struct in6_addr temp;
3124 struct net *net = dev_net(idev->dev);
3125
3126 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3127
3128 if (idev->cnf.stable_secret.initialized)
3129 secret = idev->cnf.stable_secret.secret;
3130 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3131 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3132 else
3133 return -1;
3134
3135retry:
3136 spin_lock_bh(&lock);
3137
3138 sha_init(digest);
3139 memset(&data, 0, sizeof(data));
3140 memset(workspace, 0, sizeof(workspace));
3141 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3142 data.prefix[0] = address->s6_addr32[0];
3143 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3144 data.secret = secret;
3145 data.dad_count = dad_count;
3146
3147 sha_transform(digest, data.__data, workspace);
3148
3149 temp = *address;
ff40217e
HFS		 3150 temp.s6_addr32[2] = (__force __be32)digest[0];
3151 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3152
3153 spin_unlock_bh(&lock);
3154
3155 if (ipv6_reserved_interfaceid(temp)) {
3156 dad_count++;
1855b7c3 3157 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3158 return -1;
3159 goto retry;
3160 }
3161
3162 *address = temp;
3163 return 0;
3164}
3165
cc9da6cc
BM		 3166static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3167{
3168 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3169
3170 if (s->initialized)
3171 return;
3172 s = &idev->cnf.stable_secret;
3173 get_random_bytes(&s->secret, sizeof(s->secret));
3174 s->initialized = true;
3175}
3176
bc91b0f0
JP		 3177static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3178{
622c81d5
HFS		 3179 struct in6_addr addr;
3180
ca254490
DA		 3181 /* no link local addresses on L3 master devices */
3182 if (netif_is_l3_master(idev->dev))
3183 return;
3184
622c81d5 3185 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3186
d35a00b8 3187 switch (idev->cnf.addr_gen_mode) {
cc9da6cc
BM		 3188 case IN6_ADDR_GEN_MODE_RANDOM:
3189 ipv6_gen_mode_random_init(idev);
3190 /* fallthrough */
3191 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3192 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3193 addrconf_add_linklocal(idev, &addr,
3194 IFA_F_STABLE_PRIVACY);
622c81d5
HFS		 3195 else if (prefix_route)
3196 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3197 break;
3198 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3199 /* addrconf_add_linklocal also adds a prefix_route and we
3200 * only need to care about prefix routes if ipv6_generate_eui64
3201 * couldn't generate one.
3202 */
3203 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3204 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0
JP		 3205 else if (prefix_route)
3206 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3207 break;
3208 case IN6_ADDR_GEN_MODE_NONE:
3209 default:
3210 /* will not add any link local address */
3211 break;
bc91b0f0
JP		 3212 }
3213}
3214
1da177e4
LT		 3215static void addrconf_dev_config(struct net_device *dev)
3216{
8e5e8f30 3217 struct inet6_dev *idev;
1da177e4
LT		 3218
3219 ASSERT_RTNL();
3220
74235a25
HX		 3221 if ((dev->type != ARPHRD_ETHER) &&
3222 (dev->type != ARPHRD_FDDI) &&
74235a25 3223 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3224 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3225 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3226 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc 3227 (dev->type != ARPHRD_6LOWPAN) &&
45ce0fd1
FJ		 3228 (dev->type != ARPHRD_IP6GRE) &&
3229 (dev->type != ARPHRD_IPGRE) &&
3230 (dev->type != ARPHRD_TUNNEL) &&
cc9da6cc 3231 (dev->type != ARPHRD_NONE)) {
74235a25
HX		 3232 /* Alas, we support only Ethernet autoconfiguration. */
3233 return;
3234 }
3235
1da177e4 3236 idev = addrconf_add_dev(dev);
64e724f6 3237 if (IS_ERR(idev))
1da177e4
LT		 3238 return;
3239
cc9da6cc
BM		 3240 /* this device type has no EUI support */
3241 if (dev->type == ARPHRD_NONE &&
d35a00b8
FJ		 3242 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3243 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc 3244
bc91b0f0 3245 addrconf_addr_gen(idev, false);
1da177e4
LT		 3246}
3247
07a93626 3248#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3249static void addrconf_sit_config(struct net_device *dev)
3250{
3251 struct inet6_dev *idev;
3252
3253 ASSERT_RTNL();
3254
1ab1457c
YH		 3255 /*
3256 * Configure the tunnel with one of our IPv4
3257 * addresses... we should configure all of
1da177e4
LT		 3258 * our v4 addrs in the tunnel
3259 */
3260
e5d08d71 3261 idev = ipv6_find_idev(dev);
63159f29 3262 if (!idev) {
91df42be 3263 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3264 return;
3265 }
3266
c7dc89c0 3267 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3268 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3269 return;
3270 }
3271
1da177e4
LT		 3272 sit_add_v4_addrs(idev);
3273
62b54dd9 3274 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3275 addrconf_add_mroute(dev);
1da177e4 3276}
0be669bb 3277#endif
1da177e4 3278
07a93626 3279#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3280static void addrconf_gre_config(struct net_device *dev)
3281{
3282 struct inet6_dev *idev;
aee80b54 3283
aee80b54 3284 ASSERT_RTNL();
3285
e5d08d71 3286 idev = ipv6_find_idev(dev);
63159f29 3287 if (!idev) {
91df42be 3288 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3289 return;
3290 }
3291
bc91b0f0 3292 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3293 if (dev->flags & IFF_POINTOPOINT)
3294 addrconf_add_mroute(dev);
aee80b54 3295}
3296#endif
3297
f1705ec1
DA		 3298static int fixup_permanent_addr(struct inet6_dev *idev,
3299 struct inet6_ifaddr *ifp)
3300{
3301 if (!ifp->rt) {
3302 struct rt6_info *rt;
3303
3304 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3305 if (unlikely(IS_ERR(rt)))
3306 return PTR_ERR(rt);
3307
3308 ifp->rt = rt;
3309 }
3310
3311 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3312 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3313 idev->dev, 0, 0);
3314 }
3315
3316 addrconf_dad_start(ifp);
3317
3318 return 0;
3319}
3320
3321static void addrconf_permanent_addr(struct net_device *dev)
3322{
3323 struct inet6_ifaddr *ifp, *tmp;
3324 struct inet6_dev *idev;
3325
3326 idev = __in6_dev_get(dev);
3327 if (!idev)
3328 return;
3329
3330 write_lock_bh(&idev->lock);
3331
3332 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3333 if ((ifp->flags & IFA_F_PERMANENT) &&
3334 fixup_permanent_addr(idev, ifp) < 0) {
3335 write_unlock_bh(&idev->lock);
3336 ipv6_del_addr(ifp);
3337 write_lock_bh(&idev->lock);
3338
3339 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3340 idev->dev->name, &ifp->addr);
3341 }
3342 }
3343
3344 write_unlock_bh(&idev->lock);
3345}
3346
1ab1457c 3347static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3348 void *ptr)
1da177e4 3349{
351638e7 3350 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4f7f34ea 3351 struct netdev_notifier_changeupper_info *info;
748e2d93 3352 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 3353 int run_pending = 0;
b217d616 3354 int err;
1da177e4 3355
e21e8467 3356 switch (event) {
45ba9dd2 3357 case NETDEV_REGISTER:
74235a25 3358 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3359 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3360 if (IS_ERR(idev))
3361 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3362 }
3363 break;
bcdd553f 3364
b7b0b1d2
AD		 3365 case NETDEV_CHANGEMTU:
3366 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3367 if (dev->mtu < IPV6_MIN_MTU) {
3368 addrconf_ifdown(dev, 1);
3369 break;
3370 }
3371
3372 if (idev) {
3373 rt6_mtu_change(dev, dev->mtu);
3374 idev->cnf.mtu6 = dev->mtu;
3375 break;
3376 }
3377
3378 /* allocate new idev */
3379 idev = ipv6_add_dev(dev);
3380 if (IS_ERR(idev))
3381 break;
3382
3383 /* device is still not ready */
3384 if (!(idev->if_flags & IF_READY))
3385 break;
3386
3387 run_pending = 1;
3388
3389 /* fall through */
3390
1da177e4 3391 case NETDEV_UP:
3c21edbd 3392 case NETDEV_CHANGE:
c2edacf8
JV		 3393 if (dev->flags & IFF_SLAVE)
3394 break;
3395
3ce62a84
WC		 3396 if (idev && idev->cnf.disable_ipv6)
3397 break;
3398
3c21edbd 3399 if (event == NETDEV_UP) {
38bd10c4
DA		 3400 /* restore routes for permanent addresses */
3401 addrconf_permanent_addr(dev);
3402
f24e3d65 3403 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 3404 /* device is not ready yet. */
f3213831 3405 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3406 dev->name);
3407 break;
3408 }
99081049 3409
d31c7b8f
EP		 3410 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3411 idev = ipv6_add_dev(dev);
3412
a317a2f1 3413 if (!IS_ERR_OR_NULL(idev)) {
99081049 3414 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3415 run_pending = 1;
3416 }
b7b0b1d2 3417 } else if (event == NETDEV_CHANGE) {
f24e3d65 3418 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 3419 /* device is still not ready. */
3420 break;
3421 }
3422
3423 if (idev) {
a088d1d7
LL		 3424 if (idev->if_flags & IF_READY) {
3425 /* device is already configured -
3426 * but resend MLD reports, we might
3427 * have roamed and need to update
3428 * multicast snooping switches
3429 */
3430 ipv6_mc_up(idev);
3c21edbd 3431 break;
a088d1d7 3432 }
3c21edbd
YH		 3433 idev->if_flags |= IF_READY;
3434 }
3435
f3213831
JP		 3436 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3437 dev->name);
3c21edbd 3438
c5e33bdd 3439 run_pending = 1;
3c21edbd
YH		 3440 }
3441
e21e8467 3442 switch (dev->type) {
07a93626 3443#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3444 case ARPHRD_SIT:
3445 addrconf_sit_config(dev);
3446 break;
aee80b54 3447#endif
07a93626 3448#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3449 case ARPHRD_IPGRE:
3450 addrconf_gre_config(dev);
3451 break;
0be669bb 3452#endif
1da177e4
LT		 3453 case ARPHRD_LOOPBACK:
3454 init_loopback(dev);
3455 break;
3456
3457 default:
3458 addrconf_dev_config(dev);
3459 break;
3ff50b79 3460 }
bcdd553f 3461
a317a2f1 3462 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3463 if (run_pending)
3464 addrconf_dad_run(idev);
3465
bcdd553f
SH		 3466 /*
3467 * If the MTU changed during the interface down,
3468 * when the interface up, the changed MTU must be
3469 * reflected in the idev as well as routers.
1da177e4 3470 */
bcdd553f
SH		 3471 if (idev->cnf.mtu6 != dev->mtu &&
3472 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3473 rt6_mtu_change(dev, dev->mtu);
3474 idev->cnf.mtu6 = dev->mtu;
3475 }
3476 idev->tstamp = jiffies;
3477 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3478
3479 /*
3480 * If the changed mtu during down is lower than
3481 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3482 */
3483 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 3484 addrconf_ifdown(dev, 1);
1da177e4
LT		 3485 }
3486 break;
3487
1da177e4
LT		 3488 case NETDEV_DOWN:
3489 case NETDEV_UNREGISTER:
3490 /*
3491 * Remove all addresses from this interface.
3492 */
3493 addrconf_ifdown(dev, event != NETDEV_DOWN);
3494 break;
3c21edbd 3495
1da177e4 3496 case NETDEV_CHANGENAME:
1da177e4 3497 if (idev) {
5632c515 3498 snmp6_unregister_dev(idev);
408c4768 3499 addrconf_sysctl_unregister(idev);
a317a2f1 3500 err = addrconf_sysctl_register(idev);
b217d616
HX		 3501 if (err)
3502 return notifier_from_errno(err);
a317a2f1
WC		 3503 err = snmp6_register_dev(idev);
3504 if (err) {
3505 addrconf_sysctl_unregister(idev);
3506 return notifier_from_errno(err);
3507 }
5632c515 3508 }
1da177e4 3509 break;
bcdd553f 3510
93d9b7d7
JP		 3511 case NETDEV_PRE_TYPE_CHANGE:
3512 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3513 if (idev)
3514 addrconf_type_change(dev, event);
75c78500 3515 break;
4f7f34ea
DA		 3516
3517 case NETDEV_CHANGEUPPER:
3518 info = ptr;
3519
3520 /* flush all routes if dev is linked to or unlinked from
3521 * an L3 master device (e.g., VRF)
3522 */
3523 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3524 addrconf_ifdown(dev, 0);
3ff50b79 3525 }
1da177e4
LT		 3526
3527 return NOTIFY_OK;
3528}
3529
3530/*
3531 * addrconf module should be notified of a device going up
3532 */
3533static struct notifier_block ipv6_dev_notf = {
3534 .notifier_call = addrconf_notify,
1da177e4
LT		 3535};
3536
93d9b7d7 3537static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3538{
3539 struct inet6_dev *idev;
3540 ASSERT_RTNL();
3541
3542 idev = __in6_dev_get(dev);
3543
93d9b7d7 3544 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3545 ipv6_mc_remap(idev);
93d9b7d7 3546 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3547 ipv6_mc_unmap(idev);
3548}
3549
70af921d
DA		 3550static bool addr_is_local(const struct in6_addr *addr)
3551{
3552 return ipv6_addr_type(addr) &
3553 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3554}
3555
1da177e4
LT		 3556static int addrconf_ifdown(struct net_device *dev, int how)
3557{
c346dca1 3558 struct net *net = dev_net(dev);
502a2ffd 3559 struct inet6_dev *idev;
f1705ec1
DA		 3560 struct inet6_ifaddr *ifa, *tmp;
3561 struct list_head del_list;
3562 int _keep_addr;
3563 bool keep_addr;
73a8bd74 3564 int state, i;
1da177e4
LT		 3565
3566 ASSERT_RTNL();
3567
73a8bd74
DM		 3568 rt6_ifdown(net, dev);
3569 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3570
3571 idev = __in6_dev_get(dev);
63159f29 3572 if (!idev)
1da177e4
LT		 3573 return -ENODEV;
3574
bcdd553f
SH		 3575 /*
3576 * Step 1: remove reference to ipv6 device from parent device.
3577 * Do not dev_put!
1da177e4 3578 */
439e2385 3579 if (how) {
1da177e4 3580 idev->dead = 1;
8814c4b5
YH		 3581
3582 /* protected by rtnl_lock */
a9b3cd7f 3583 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3584
3585 /* Step 1.5: remove snmp6 entry */
3586 snmp6_unregister_dev(idev);
3587
3588 }
3589
f1705ec1
DA		 3590 /* aggregate the system setting and interface setting */
3591 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3592 if (!_keep_addr)
3593 _keep_addr = idev->cnf.keep_addr_on_down;
3594
3595 /* combine the user config with event to determine if permanent
3596 * addresses are to be removed from address hash table
3597 */
bc561632 3598 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
f1705ec1 3599
73a8bd74
DM		 3600 /* Step 2: clear hash table */
3601 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3602 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3603
3604 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3605restart:
b67bfe0d 3606 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3607 if (ifa->idev == idev) {
c15b1cca 3608 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3609 /* combined flag + permanent flag decide if
3610 * address is retained on a down event
3611 */
3612 if (!keep_addr ||
70af921d
DA		 3613 !(ifa->flags & IFA_F_PERMANENT) ||
3614 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3615 hlist_del_init_rcu(&ifa->addr_lst);
3616 goto restart;
3617 }
73a8bd74
DM		 3618 }
3619 }
3620 spin_unlock_bh(&addrconf_hash_lock);
3621 }
3622
1da177e4
LT		 3623 write_lock_bh(&idev->lock);
3624
b7b1bfce
HFS		 3625 addrconf_del_rs_timer(idev);
3626
bcdd553f 3627 /* Step 2: clear flags for stateless addrconf */
439e2385 3628 if (!how)
3c21edbd 3629 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3630
bcdd553f 3631 /* Step 3: clear tempaddr list */
372e6c8f 3632 while (!list_empty(&idev->tempaddr_list)) {
3633 ifa = list_first_entry(&idev->tempaddr_list,
3634 struct inet6_ifaddr, tmp_list);
3635 list_del(&ifa->tmp_list);
1da177e4
LT		 3636 write_unlock_bh(&idev->lock);
3637 spin_lock_bh(&ifa->lock);
3638
3639 if (ifa->ifpub) {
3640 in6_ifa_put(ifa->ifpub);
3641 ifa->ifpub = NULL;
3642 }
3643 spin_unlock_bh(&ifa->lock);
3644 in6_ifa_put(ifa);
3645 write_lock_bh(&idev->lock);
3646 }
8f37ada5 3647
f1705ec1
DA		 3648 /* re-combine the user config with event to determine if permanent
3649 * addresses are to be removed from the interface list
3650 */
bc561632 3651 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
84e8b803 3652
f1705ec1
DA		 3653 INIT_LIST_HEAD(&del_list);
3654 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
38bd10c4
DA		 3655 struct rt6_info *rt = NULL;
3656
f1705ec1 3657 addrconf_del_dad_work(ifa);
84e8b803 3658
73a8bd74 3659 write_unlock_bh(&idev->lock);
8e8e676d 3660 spin_lock_bh(&ifa->lock);
f1705ec1 3661
70af921d
DA		 3662 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3663 !addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3664 /* set state to skip the notifier below */
3665 state = INET6_IFADDR_STATE_DEAD;
3666 ifa->state = 0;
3667 if (!(ifa->flags & IFA_F_NODAD))
3668 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3669
3670 rt = ifa->rt;
3671 ifa->rt = NULL;
f1705ec1
DA		 3672 } else {
3673 state = ifa->state;
3674 ifa->state = INET6_IFADDR_STATE_DEAD;
3675
c882219a 3676 list_move(&ifa->if_list, &del_list);
f1705ec1
DA		 3677 }
3678
8e8e676d 3679 spin_unlock_bh(&ifa->lock);
9d82ca98 3680
38bd10c4
DA		 3681 if (rt)
3682 ip6_del_rt(rt);
3683
73a8bd74
DM		 3684 if (state != INET6_IFADDR_STATE_DEAD) {
3685 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3686 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
ea06f717
MM		 3687 } else {
3688 if (idev->cnf.forwarding)
3689 addrconf_leave_anycast(ifa);
3690 addrconf_leave_solict(ifa->idev, &ifa->addr);
27bdb2ab 3691 }
8f37ada5 3692
73a8bd74
DM		 3693 write_lock_bh(&idev->lock);
3694 }
8f37ada5 3695
1da177e4
LT		 3696 write_unlock_bh(&idev->lock);
3697
f1705ec1
DA		 3698 /* now clean up addresses to be removed */
3699 while (!list_empty(&del_list)) {
3700 ifa = list_first_entry(&del_list,
3701 struct inet6_ifaddr, if_list);
3702 list_del(&ifa->if_list);
3703
3704 in6_ifa_put(ifa);
3705 }
3706
381f4dca
SD		 3707 /* Step 5: Discard anycast and multicast list */
3708 if (how) {
3709 ipv6_ac_destroy_dev(idev);
1da177e4 3710 ipv6_mc_destroy_dev(idev);
381f4dca 3711 } else {
1da177e4 3712 ipv6_mc_down(idev);
381f4dca 3713 }
1da177e4 3714
1da177e4 3715 idev->tstamp = jiffies;
1ab1457c 3716
bcdd553f 3717 /* Last: Shot the device (if unregistered) */
439e2385 3718 if (how) {
408c4768 3719 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3720 neigh_parms_release(&nd_tbl, idev->nd_parms);
3721 neigh_ifdown(&nd_tbl, dev);
3722 in6_dev_put(idev);
3723 }
3724 return 0;
3725}
3726
3727static void addrconf_rs_timer(unsigned long data)
3728{
b7b1bfce 3729 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3730 struct net_device *dev = idev->dev;
b7b1bfce 3731 struct in6_addr lladdr;
1da177e4 3732
b7b1bfce 3733 write_lock(&idev->lock);
5b2a1953 3734 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3735 goto out;
3736
9ba2add3 3737 if (!ipv6_accept_ra(idev))
5b2a1953 3738 goto out;
3739
3740 /* Announcement received after solicitation was sent */
3741 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3742 goto out;
1da177e4 3743
bd11f074 3744 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
caf92bc4
CW		 3745 write_unlock(&idev->lock);
3746 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3747 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3748 &in6addr_linklocal_allrouters);
3749 else
caf92bc4 3750 goto put;
1da177e4 3751
caf92bc4 3752 write_lock(&idev->lock);
bd11f074
MŻ		 3753 idev->rs_interval = rfc3315_s14_backoff_update(
3754 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
b7b1bfce
HFS		 3755 /* The wait after the last probe can be shorter */
3756 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3757 idev->cnf.rtr_solicits) ?
3758 idev->cnf.rtr_solicit_delay :
bd11f074 3759 idev->rs_interval);
1da177e4 3760 } else {
1da177e4
LT		 3761 /*
3762 * Note: we do not support deprecated "all on-link"
3763 * assumption any longer.
3764 */
91df42be 3765 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3766 }
3767
3768out:
b7b1bfce 3769 write_unlock(&idev->lock);
caf92bc4 3770put:
b7b1bfce 3771 in6_dev_put(idev);
1da177e4
LT		 3772}
3773
3774/*
3775 * Duplicate Address Detection
3776 */
3c21edbd
YH		 3777static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3778{
3779 unsigned long rand_num;
3780 struct inet6_dev *idev = ifp->idev;
adc176c5 3781 u64 nonce;
3c21edbd 3782
95c385b4
NH		 3783 if (ifp->flags & IFA_F_OPTIMISTIC)
3784 rand_num = 0;
3785 else
63862b5b 3786 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3787
adc176c5
EN		 3788 nonce = 0;
3789 if (idev->cnf.enhanced_dad ||
3790 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3791 do
3792 get_random_bytes(&nonce, 6);
3793 while (nonce == 0);
3794 }
3795 ifp->dad_nonce = nonce;
b7b1bfce 3796 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3797 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3798}
3799
c15b1cca 3800static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3801{
3802 struct inet6_dev *idev = ifp->idev;
3803 struct net_device *dev = idev->dev;
764d3be6 3804 bool bump_id, notify = false;
1da177e4
LT		 3805
3806 addrconf_join_solict(dev, &ifp->addr);
3807
63862b5b 3808 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3809
3810 read_lock_bh(&idev->lock);
622ccdf1 3811 spin_lock(&ifp->lock);
e9d3e084 3812 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3813 goto out;
1da177e4
LT		 3814
3815 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3816 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3817 !(ifp->flags&IFA_F_TENTATIVE) ||
3818 ifp->flags & IFA_F_NODAD) {
764d3be6 3819 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3820 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3821 spin_unlock(&ifp->lock);
1da177e4
LT		 3822 read_unlock_bh(&idev->lock);
3823
764d3be6 3824 addrconf_dad_completed(ifp, bump_id);
1da177e4
LT		 3825 return;
3826 }
3827
6732bade 3828 if (!(idev->if_flags & IF_READY)) {
21809faf 3829 spin_unlock(&ifp->lock);
6732bade 3830 read_unlock_bh(&idev->lock);
3c21edbd 3831 /*
590a9887 3832 * If the device is not ready:
3c21edbd
YH		 3833 * - keep it tentative if it is a permanent address.
3834 * - otherwise, kill it.
3835 */
3836 in6_ifa_hold(ifp);
cc411d0b 3837 addrconf_dad_stop(ifp, 0);
6732bade 3838 return;
3c21edbd 3839 }
95c385b4
NH		 3840
3841 /*
3842 * Optimistic nodes can start receiving
3843 * Frames right away
3844 */
7fd2561e 3845 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3846 ip6_ins_rt(ifp->rt);
7fd2561e
EK		 3847 if (ipv6_use_optimistic_addr(idev)) {
3848 /* Because optimistic nodes can use this address,
3849 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3850 */
16186a82 3851 notify = true;
7fd2561e
EK		 3852 }
3853 }
95c385b4 3854
6732bade 3855 addrconf_dad_kick(ifp);
1da177e4 3856out:
622ccdf1 3857 spin_unlock(&ifp->lock);
1da177e4 3858 read_unlock_bh(&idev->lock);
16186a82
SAK		 3859 if (notify)
3860 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 3861}
3862
c15b1cca 3863static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3864{
c15b1cca
HFS		 3865 bool begin_dad = false;
3866
8e8e676d 3867 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3868 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3869 ifp->state = INET6_IFADDR_STATE_PREDAD;
3870 begin_dad = true;
3871 }
8e8e676d 3872 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3873
3874 if (begin_dad)
3875 addrconf_mod_dad_work(ifp, 0);
3876}
3877
3878static void addrconf_dad_work(struct work_struct *w)
3879{
3880 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3881 struct inet6_ifaddr,
3882 dad_work);
1da177e4 3883 struct inet6_dev *idev = ifp->idev;
764d3be6 3884 bool bump_id, disable_ipv6 = false;
1da177e4
LT		 3885 struct in6_addr mcaddr;
3886
c15b1cca
HFS		 3887 enum {
3888 DAD_PROCESS,
3889 DAD_BEGIN,
3890 DAD_ABORT,
3891 } action = DAD_PROCESS;
3892
3893 rtnl_lock();
3894
8e8e676d 3895 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3896 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3897 action = DAD_BEGIN;
3898 ifp->state = INET6_IFADDR_STATE_DAD;
3899 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3900 action = DAD_ABORT;
3901 ifp->state = INET6_IFADDR_STATE_POSTDAD;
85b51b12
MM		 3902
3903 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3904 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3905 struct in6_addr addr;
3906
3907 addr.s6_addr32[0] = htonl(0xfe800000);
3908 addr.s6_addr32[1] = 0;
3909
3910 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3911 ipv6_addr_equal(&ifp->addr, &addr)) {
3912 /* DAD failed for link-local based on MAC */
3913 idev->cnf.disable_ipv6 = 1;
3914
3915 pr_info("%s: IPv6 being disabled!\n",
3916 ifp->idev->dev->name);
3917 disable_ipv6 = true;
3918 }
3919 }
c15b1cca 3920 }
8e8e676d 3921 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3922
3923 if (action == DAD_BEGIN) {
3924 addrconf_dad_begin(ifp);
3925 goto out;
3926 } else if (action == DAD_ABORT) {
751eb6b6 3927 in6_ifa_hold(ifp);
c15b1cca 3928 addrconf_dad_stop(ifp, 1);
85b51b12
MM		 3929 if (disable_ipv6)
3930 addrconf_ifdown(idev->dev, 0);
c15b1cca
HFS		 3931 goto out;
3932 }
3933
b7b1bfce 3934 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3935 goto out;
3936
c15b1cca 3937 write_lock_bh(&idev->lock);
122e4519 3938 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3939 write_unlock_bh(&idev->lock);
1da177e4
LT		 3940 goto out;
3941 }
21809faf 3942
3943 spin_lock(&ifp->lock);
622ccdf1
HX		 3944 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3945 spin_unlock(&ifp->lock);
c15b1cca 3946 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3947 goto out;
3948 }
3949
b7b1bfce 3950 if (ifp->dad_probes == 0) {
1da177e4
LT		 3951 /*
3952 * DAD was successful
3953 */
3954
764d3be6 3955 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3956 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3957 spin_unlock(&ifp->lock);
c15b1cca 3958 write_unlock_bh(&idev->lock);
1da177e4 3959
764d3be6 3960 addrconf_dad_completed(ifp, bump_id);
1da177e4
LT		 3961
3962 goto out;
3963 }
3964
b7b1bfce 3965 ifp->dad_probes--;
c15b1cca
HFS		 3966 addrconf_mod_dad_work(ifp,
3967 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3968 spin_unlock(&ifp->lock);
c15b1cca 3969 write_unlock_bh(&idev->lock);
1da177e4
LT		 3970
3971 /* send a neighbour solicitation for our addr */
1da177e4 3972 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
adc176c5
EN		 3973 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
3974 ifp->dad_nonce);
1da177e4
LT		 3975out:
3976 in6_ifa_put(ifp);
c15b1cca 3977 rtnl_unlock();
1da177e4
LT		 3978}
3979
11ffff75
HFS		 3980/* ifp->idev must be at least read locked */
3981static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3982{
3983 struct inet6_ifaddr *ifpiter;
3984 struct inet6_dev *idev = ifp->idev;
3985
602582ca
HFS		 3986 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3987 if (ifpiter->scope > IFA_LINK)
3988 break;
11ffff75
HFS		 3989 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3990 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3991 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3992 IFA_F_PERMANENT)
3993 return false;
3994 }
3995 return true;
3996}
3997
764d3be6 3998static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id)
1da177e4 3999{
e21e8467 4000 struct net_device *dev = ifp->idev->dev;
b7b1bfce 4001 struct in6_addr lladdr;
b173ee48 4002 bool send_rs, send_mld;
b7b1bfce 4003
c15b1cca 4004 addrconf_del_dad_work(ifp);
1da177e4
LT		 4005
4006 /*
4007 * Configure the address for reception. Now it is valid.
4008 */
4009
4010 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4011
026359bc
TA		 4012 /* If added prefix is link local and we are prepared to process
4013 router advertisements, start sending router solicitations.
1da177e4
LT		 4014 */
4015
1ec047eb 4016 read_lock_bh(&ifp->idev->lock);
11ffff75 4017 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 4018 send_rs = send_mld &&
4019 ipv6_accept_ra(ifp->idev) &&
bd11f074 4020 ifp->idev->cnf.rtr_solicits != 0 &&
b173ee48 4021 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 4022 read_unlock_bh(&ifp->idev->lock);
4023
b173ee48
HFS		 4024 /* While dad is in progress mld report's source address is in6_addrany.
4025 * Resend with proper ll now.
4026 */
4027 if (send_mld)
4028 ipv6_mc_dad_complete(ifp->idev);
4029
1ec047eb 4030 if (send_rs) {
1da177e4
LT		 4031 /*
4032 * If a host as already performed a random delay
4033 * [...] as part of DAD [...] there is no need
4034 * to delay again before sending the first RS
4035 */
1ec047eb 4036 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 4037 return;
1ec047eb 4038 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 4039
b7b1bfce
HFS		 4040 write_lock_bh(&ifp->idev->lock);
4041 spin_lock(&ifp->lock);
bd11f074
MŻ		 4042 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4043 ifp->idev->cnf.rtr_solicit_interval);
b7b1bfce 4044 ifp->idev->rs_probes = 1;
1da177e4 4045 ifp->idev->if_flags |= IF_RS_SENT;
bd11f074 4046 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
b7b1bfce
HFS		 4047 spin_unlock(&ifp->lock);
4048 write_unlock_bh(&ifp->idev->lock);
1da177e4 4049 }
764d3be6
PA		 4050
4051 if (bump_id)
4052 rt_genid_bump_ipv6(dev_net(dev));
a11a7f71
MH		 4053
4054 /* Make sure that a new temporary address will be created
4055 * before this temporary address becomes deprecated.
4056 */
4057 if (ifp->flags & IFA_F_TEMPORARY)
4058 addrconf_verify_rtnl();
1da177e4
LT		 4059}
4060
e21e8467
SH		 4061static void addrconf_dad_run(struct inet6_dev *idev)
4062{
c5e33bdd
YH		 4063 struct inet6_ifaddr *ifp;
4064
4065 read_lock_bh(&idev->lock);
502a2ffd 4066 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 4067 spin_lock(&ifp->lock);
f2344a13
HX		 4068 if (ifp->flags & IFA_F_TENTATIVE &&
4069 ifp->state == INET6_IFADDR_STATE_DAD)
4070 addrconf_dad_kick(ifp);
21809faf 4071 spin_unlock(&ifp->lock);
c5e33bdd
YH		 4072 }
4073 read_unlock_bh(&idev->lock);
4074}
4075
1da177e4
LT		 4076#ifdef CONFIG_PROC_FS
4077struct if6_iter_state {
3c40090a 4078 struct seq_net_private p;
1da177e4 4079 int bucket;
1d578303 4080 int offset;
1da177e4
LT		 4081};
4082
1d578303 4083static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 4084{
4085 struct inet6_ifaddr *ifa = NULL;
4086 struct if6_iter_state *state = seq->private;
1218854a 4087 struct net *net = seq_file_net(seq);
1d578303 4088 int p = 0;
1da177e4 4089
1d578303
MM		 4090 /* initial bucket if pos is 0 */
4091 if (pos == 0) {
4092 state->bucket = 0;
4093 state->offset = 0;
4094 }
4095
4096 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 4097 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 4098 addr_lst) {
9f0d3c27
ED		 4099 if (!net_eq(dev_net(ifa->idev->dev), net))
4100 continue;
1d578303
MM		 4101 /* sync with offset */
4102 if (p < state->offset) {
4103 p++;
4104 continue;
4105 }
4106 state->offset++;
9f0d3c27 4107 return ifa;
1d578303
MM		 4108 }
4109
4110 /* prepare for next bucket */
4111 state->offset = 0;
4112 p = 0;
1da177e4 4113 }
c2e21293 4114 return NULL;
1da177e4
LT		 4115}
4116
c2e21293 4117static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4118 struct inet6_ifaddr *ifa)
1da177e4
LT		 4119{
4120 struct if6_iter_state *state = seq->private;
1218854a 4121 struct net *net = seq_file_net(seq);
1da177e4 4122
b67bfe0d 4123 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 4124 if (!net_eq(dev_net(ifa->idev->dev), net))
4125 continue;
1d578303 4126 state->offset++;
9f0d3c27 4127 return ifa;
1d578303 4128 }
3c40090a 4129
c2e21293 4130 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 4131 state->offset = 0;
b67bfe0d 4132 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 4133 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 4134 if (!net_eq(dev_net(ifa->idev->dev), net))
4135 continue;
1d578303 4136 state->offset++;
9f0d3c27 4137 return ifa;
c2e21293 4138 }
1da177e4 4139 }
3c40090a 4140
c2e21293 4141 return NULL;
1da177e4
LT		 4142}
4143
1da177e4 4144static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 4145 __acquires(rcu_bh)
1da177e4 4146{
5c578aed 4147 rcu_read_lock_bh();
1d578303 4148 return if6_get_first(seq, *pos);
1da177e4
LT		 4149}
4150
4151static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4152{
4153 struct inet6_ifaddr *ifa;
4154
4155 ifa = if6_get_next(seq, v);
4156 ++*pos;
4157 return ifa;
4158}
4159
4160static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 4161 __releases(rcu_bh)
1da177e4 4162{
5c578aed 4163 rcu_read_unlock_bh();
1da177e4
LT		 4164}
4165
4166static int if6_seq_show(struct seq_file *seq, void *v)
4167{
4168 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4169 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4170 &ifp->addr,
1da177e4
LT		 4171 ifp->idev->dev->ifindex,
4172 ifp->prefix_len,
4173 ifp->scope,
971a351c 4174 (u8) ifp->flags,
1da177e4
LT		 4175 ifp->idev->dev->name);
4176 return 0;
4177}
4178
56b3d975 4179static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4180 .start = if6_seq_start,
4181 .next = if6_seq_next,
4182 .show = if6_seq_show,
4183 .stop = if6_seq_stop,
4184};
4185
4186static int if6_seq_open(struct inode *inode, struct file *file)
4187{
3c40090a
DL		 4188 return seq_open_net(inode, file, &if6_seq_ops,
4189 sizeof(struct if6_iter_state));
1da177e4
LT		 4190}
4191
9a32144e 4192static const struct file_operations if6_fops = {
1da177e4
LT		 4193 .owner = THIS_MODULE,
4194 .open = if6_seq_open,
4195 .read = seq_read,
4196 .llseek = seq_lseek,
3c40090a 4197 .release = seq_release_net,
1da177e4
LT		 4198};
4199
2c8c1e72 4200static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4201{
d4beaa66 4202 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 4203 return -ENOMEM;
4204 return 0;
4205}
4206
2c8c1e72 4207static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4208{
ece31ffd 4209 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4210}
4211
4212static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4213 .init = if6_proc_net_init,
4214 .exit = if6_proc_net_exit,
3c40090a
DL		 4215};
4216
4217int __init if6_proc_init(void)
4218{
4219 return register_pernet_subsys(&if6_proc_net_ops);
4220}
4221
1da177e4
LT		 4222void if6_proc_exit(void)
4223{
3c40090a 4224 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4225}
4226#endif /* CONFIG_PROC_FS */
4227
07a93626 4228#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4229/* Check if address is a home address configured on any interface. */
b71d1d42 4230int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 4231{
4232 int ret = 0;
c2e21293 4233 struct inet6_ifaddr *ifp = NULL;
ddbe5032 4234 unsigned int hash = inet6_addr_hash(addr);
c2e21293 4235
5c578aed 4236 rcu_read_lock_bh();
b67bfe0d 4237 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 4238 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 4239 continue;
caad295f 4240 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4241 (ifp->flags & IFA_F_HOMEADDRESS)) {
4242 ret = 1;
4243 break;
4244 }
4245 }
5c578aed 4246 rcu_read_unlock_bh();
3b9f9a1c
NT		 4247 return ret;
4248}
4249#endif
4250
1da177e4
LT		 4251/*
4252 * Periodic address status verification
4253 */
4254
c15b1cca 4255static void addrconf_verify_rtnl(void)
1da177e4 4256{
b2db7564 4257 unsigned long now, next, next_sec, next_sched;
1da177e4 4258 struct inet6_ifaddr *ifp;
1da177e4
LT		 4259 int i;
4260
c15b1cca
HFS		 4261 ASSERT_RTNL();
4262
5c578aed 4263 rcu_read_lock_bh();
1da177e4 4264 now = jiffies;
b2db7564 4265 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4266
c15b1cca 4267 cancel_delayed_work(&addr_chk_work);
1da177e4 4268
bcdd553f 4269 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4270restart:
c15b1cca 4271 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 4272 unsigned long age;
1da177e4 4273
fad8da3e
YA		 4274 /* When setting preferred_lft to a value not zero or
4275 * infinity, while valid_lft is infinity
4276 * IFA_F_PERMANENT has a non-infinity life time.
4277 */
4278 if ((ifp->flags & IFA_F_PERMANENT) &&
4279 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4280 continue;
4281
4282 spin_lock(&ifp->lock);
b2db7564
YH		 4283 /* We try to batch several events at once. */
4284 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4285
8f27ebb9
YH		 4286 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4287 age >= ifp->valid_lft) {
1da177e4
LT		 4288 spin_unlock(&ifp->lock);
4289 in6_ifa_hold(ifp);
1da177e4
LT		 4290 ipv6_del_addr(ifp);
4291 goto restart;
8f27ebb9
YH		 4292 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4293 spin_unlock(&ifp->lock);
4294 continue;
1da177e4 4295 } else if (age >= ifp->prefered_lft) {
a1ed0526 4296 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4297 int deprecate = 0;
4298
4299 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4300 deprecate = 1;
4301 ifp->flags |= IFA_F_DEPRECATED;
4302 }
4303
fad8da3e
YA		 4304 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4305 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4306 next = ifp->tstamp + ifp->valid_lft * HZ;
4307
4308 spin_unlock(&ifp->lock);
4309
4310 if (deprecate) {
4311 in6_ifa_hold(ifp);
1da177e4
LT		 4312
4313 ipv6_ifa_notify(0, ifp);
4314 in6_ifa_put(ifp);
4315 goto restart;
4316 }
1da177e4
LT		 4317 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4318 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4319 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4320 ifp->idev->cnf.dad_transmits *
1f9248e5 4321 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 4322
1da177e4
LT		 4323 if (age >= ifp->prefered_lft - regen_advance) {
4324 struct inet6_ifaddr *ifpub = ifp->ifpub;
4325 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4326 next = ifp->tstamp + ifp->prefered_lft * HZ;
4327 if (!ifp->regen_count && ifpub) {
4328 ifp->regen_count++;
4329 in6_ifa_hold(ifp);
4330 in6_ifa_hold(ifpub);
4331 spin_unlock(&ifp->lock);
5c578aed 4332
291d809b
HY		 4333 spin_lock(&ifpub->lock);
4334 ifpub->regen_count = 0;
4335 spin_unlock(&ifpub->lock);
1da177e4
LT		 4336 ipv6_create_tempaddr(ifpub, ifp);
4337 in6_ifa_put(ifpub);
4338 in6_ifa_put(ifp);
4339 goto restart;
4340 }
4341 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4342 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4343 spin_unlock(&ifp->lock);
1da177e4
LT		 4344 } else {
4345 /* ifp->prefered_lft <= ifp->valid_lft */
4346 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4347 next = ifp->tstamp + ifp->prefered_lft * HZ;
4348 spin_unlock(&ifp->lock);
4349 }
4350 }
1da177e4
LT		 4351 }
4352
b2db7564
YH		 4353 next_sec = round_jiffies_up(next);
4354 next_sched = next;
4355
4356 /* If rounded timeout is accurate enough, accept it. */
4357 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4358 next_sched = next_sec;
4359
4360 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4361 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4362 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4363
ba3542e1 4364 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4365 now, next, next_sec, next_sched);
c15b1cca 4366 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4367 rcu_read_unlock_bh();
1da177e4
LT		 4368}
4369
c15b1cca
HFS		 4370static void addrconf_verify_work(struct work_struct *w)
4371{
4372 rtnl_lock();
4373 addrconf_verify_rtnl();
4374 rtnl_unlock();
4375}
4376
4377static void addrconf_verify(void)
4378{
4379 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4380}
4381
caeaba79
ND		 4382static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4383 struct in6_addr **peer_pfx)
461d8837
TG		 4384{
4385 struct in6_addr *pfx = NULL;
4386
caeaba79
ND		 4387 *peer_pfx = NULL;
4388
461d8837
TG		 4389 if (addr)
4390 pfx = nla_data(addr);
4391
4392 if (local) {
4393 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4394 *peer_pfx = pfx;
4395 pfx = nla_data(local);
461d8837
TG		 4396 }
4397
4398 return pfx;
4399}
4400
ef7c79ed 4401static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4402 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4403 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4404 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4405 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 4406};
4407
1da177e4 4408static int
661d2967 4409inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4410{
3b1e0a65 4411 struct net *net = sock_net(skb->sk);
b933f716
TG		 4412 struct ifaddrmsg *ifm;
4413 struct nlattr *tb[IFA_MAX+1];
caeaba79 4414 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4415 u32 ifa_flags;
b933f716 4416 int err;
1da177e4 4417
b933f716
TG		 4418 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4419 if (err < 0)
4420 return err;
4421
4422 ifm = nlmsg_data(nlh);
caeaba79 4423 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4424 if (!pfx)
1da177e4
LT		 4425 return -EINVAL;
4426
6046d5b4
HK		 4427 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4428
4429 /* We ignore other flags so far. */
4430 ifa_flags &= IFA_F_MANAGETEMPADDR;
4431
4432 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4433 ifm->ifa_prefixlen);
1da177e4
LT		 4434}
4435
479840ff 4436static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 4437 u32 prefered_lft, u32 valid_lft)
081bba5b 4438{
6f704992
YH		 4439 u32 flags;
4440 clock_t expires;
4bed72e4 4441 unsigned long timeout;
53bd6749 4442 bool was_managetempaddr;
5b84efec 4443 bool had_prefixroute;
46d48046 4444
c15b1cca
HFS		 4445 ASSERT_RTNL();
4446
081bba5b
NT		 4447 if (!valid_lft || (prefered_lft > valid_lft))
4448 return -EINVAL;
4449
53bd6749
JP		 4450 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4451 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4452 return -EINVAL;
4453
4bed72e4
YH		 4454 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4455 if (addrconf_finite_timeout(timeout)) {
4456 expires = jiffies_to_clock_t(timeout * HZ);
4457 valid_lft = timeout;
6f704992 4458 flags = RTF_EXPIRES;
4bed72e4
YH		 4459 } else {
4460 expires = 0;
4461 flags = 0;
4462 ifa_flags |= IFA_F_PERMANENT;
6f704992 4463 }
081bba5b 4464
4bed72e4
YH		 4465 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4466 if (addrconf_finite_timeout(timeout)) {
4467 if (timeout == 0)
4468 ifa_flags |= IFA_F_DEPRECATED;
4469 prefered_lft = timeout;
4470 }
081bba5b
NT		 4471
4472 spin_lock_bh(&ifp->lock);
53bd6749 4473 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4474 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4475 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4476 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4477 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4478 IFA_F_NOPREFIXROUTE);
53bd6749 4479 ifp->flags |= ifa_flags;
081bba5b
NT		 4480 ifp->tstamp = jiffies;
4481 ifp->valid_lft = valid_lft;
4482 ifp->prefered_lft = prefered_lft;
4483
4484 spin_unlock_bh(&ifp->lock);
4485 if (!(ifp->flags&IFA_F_TENTATIVE))
4486 ipv6_ifa_notify(0, ifp);
081bba5b 4487
761aac73
TH		 4488 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4489 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4490 expires, flags);
5b84efec
TH		 4491 } else if (had_prefixroute) {
4492 enum cleanup_prefix_rt_t action;
4493 unsigned long rt_expires;
4494
4495 write_lock_bh(&ifp->idev->lock);
4496 action = check_cleanup_prefix_route(ifp, &rt_expires);
4497 write_unlock_bh(&ifp->idev->lock);
4498
4499 if (action != CLEANUP_PREFIX_RT_NOP) {
4500 cleanup_prefix_route(ifp, rt_expires,
4501 action == CLEANUP_PREFIX_RT_DEL);
4502 }
761aac73 4503 }
53bd6749
JP		 4504
4505 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4506 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4507 valid_lft = prefered_lft = 0;
4508 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4509 !was_managetempaddr, jiffies);
4510 }
4511
c15b1cca 4512 addrconf_verify_rtnl();
081bba5b
NT		 4513
4514 return 0;
4515}
4516
1da177e4 4517static int
661d2967 4518inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4519{
3b1e0a65 4520 struct net *net = sock_net(skb->sk);
461d8837
TG		 4521 struct ifaddrmsg *ifm;
4522 struct nlattr *tb[IFA_MAX+1];
caeaba79 4523 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 4524 struct inet6_ifaddr *ifa;
4525 struct net_device *dev;
55ebaef1 4526 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 4527 u32 ifa_flags;
461d8837 4528 int err;
1da177e4 4529
461d8837
TG		 4530 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4531 if (err < 0)
4532 return err;
4533
4534 ifm = nlmsg_data(nlh);
caeaba79 4535 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4536 if (!pfx)
1da177e4
LT		 4537 return -EINVAL;
4538
461d8837 4539 if (tb[IFA_CACHEINFO]) {
0778769d 4540 struct ifa_cacheinfo *ci;
461d8837
TG		 4541
4542 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 4543 valid_lft = ci->ifa_valid;
461d8837
TG		 4544 preferred_lft = ci->ifa_prefered;
4545 } else {
4546 preferred_lft = INFINITY_LIFE_TIME;
4547 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 4548 }
4549
af284937 4550 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4551 if (!dev)
7198f8ce
TG		 4552 return -ENODEV;
4553
479840ff
JP		 4554 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4555
55ebaef1 4556 /* We ignore other flags so far. */
761aac73 4557 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
93a714d6 4558 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
55ebaef1 4559
1cab3da6 4560 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
63159f29 4561 if (!ifa) {
7198f8ce
TG		 4562 /*
4563 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4564 * userspace already relies on not having to provide this.
7198f8ce 4565 */
caeaba79 4566 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 4567 ifm->ifa_prefixlen, ifa_flags,
4568 preferred_lft, valid_lft);
081bba5b
NT		 4569 }
4570
7198f8ce
TG		 4571 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4572 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4573 err = -EEXIST;
4574 else
55ebaef1 4575 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 4576
4577 in6_ifa_put(ifa);
4578
4579 return err;
1da177e4
LT		 4580}
4581
479840ff 4582static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4583 u8 scope, int ifindex)
4584{
4585 struct ifaddrmsg *ifm;
4586
4587 ifm = nlmsg_data(nlh);
4588 ifm->ifa_family = AF_INET6;
4589 ifm->ifa_prefixlen = prefixlen;
4590 ifm->ifa_flags = flags;
4591 ifm->ifa_scope = scope;
4592 ifm->ifa_index = ifindex;
4593}
4594
85486af0
TG		 4595static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4596 unsigned long tstamp, u32 preferred, u32 valid)
4597{
4598 struct ifa_cacheinfo ci;
4599
18a31e1e
TG		 4600 ci.cstamp = cstamp_delta(cstamp);
4601 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4602 ci.ifa_prefered = preferred;
4603 ci.ifa_valid = valid;
4604
4605 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4606}
4607
101bb229
TG		 4608static inline int rt_scope(int ifa_scope)
4609{
4610 if (ifa_scope & IFA_HOST)
4611 return RT_SCOPE_HOST;
4612 else if (ifa_scope & IFA_LINK)
4613 return RT_SCOPE_LINK;
4614 else if (ifa_scope & IFA_SITE)
4615 return RT_SCOPE_SITE;
4616 else
4617 return RT_SCOPE_UNIVERSE;
4618}
4619
0ab6803b
TG		 4620static inline int inet6_ifaddr_msgsize(void)
4621{
339bf98f 4622 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4623 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4624 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4625 + nla_total_size(sizeof(struct ifa_cacheinfo))
4626 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4627}
c5396a31 4628
1da177e4 4629static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4630 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4631{
1da177e4 4632 struct nlmsghdr *nlh;
85486af0 4633 u32 preferred, valid;
1da177e4 4634
15e47304 4635 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4636 if (!nlh)
26932566 4637 return -EMSGSIZE;
0ab6803b 4638
101bb229
TG		 4639 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4640 ifa->idev->dev->ifindex);
4641
fad8da3e
YA		 4642 if (!((ifa->flags&IFA_F_PERMANENT) &&
4643 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4644 preferred = ifa->prefered_lft;
4645 valid = ifa->valid_lft;
4646 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4647 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4648 if (preferred > tval)
4649 preferred -= tval;
4650 else
4651 preferred = 0;
f56619fc
BH		 4652 if (valid != INFINITY_LIFE_TIME) {
4653 if (valid > tval)
4654 valid -= tval;
4655 else
4656 valid = 0;
4657 }
1da177e4
LT		 4658 }
4659 } else {
85486af0
TG		 4660 preferred = INFINITY_LIFE_TIME;
4661 valid = INFINITY_LIFE_TIME;
4662 }
4663
7996c799 4664 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4665 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4666 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4667 goto error;
4668 } else
930345ea 4669 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4670 goto error;
4671
4672 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4673 goto error;
1da177e4 4674
479840ff
JP		 4675 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4676 goto error;
4677
053c095a
JB		 4678 nlmsg_end(skb, nlh);
4679 return 0;
caeaba79
ND		 4680
4681error:
4682 nlmsg_cancel(skb, nlh);
4683 return -EMSGSIZE;
1da177e4
LT		 4684}
4685
4686static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4687 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4688{
1da177e4 4689 struct nlmsghdr *nlh;
101bb229
TG		 4690 u8 scope = RT_SCOPE_UNIVERSE;
4691 int ifindex = ifmca->idev->dev->ifindex;
4692
4693 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4694 scope = RT_SCOPE_SITE;
1da177e4 4695
15e47304 4696 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4697 if (!nlh)
26932566 4698 return -EMSGSIZE;
85486af0 4699
0ab6803b 4700 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4701 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4702 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4703 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4704 nlmsg_cancel(skb, nlh);
4705 return -EMSGSIZE;
4706 }
85486af0 4707
053c095a
JB		 4708 nlmsg_end(skb, nlh);
4709 return 0;
1da177e4
LT		 4710}
4711
4712static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4713 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4714{
1da177e4 4715 struct nlmsghdr *nlh;
101bb229
TG		 4716 u8 scope = RT_SCOPE_UNIVERSE;
4717 int ifindex = ifaca->aca_idev->dev->ifindex;
4718
4719 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4720 scope = RT_SCOPE_SITE;
1da177e4 4721
15e47304 4722 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4723 if (!nlh)
26932566 4724 return -EMSGSIZE;
85486af0 4725
0ab6803b 4726 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4727 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4728 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4729 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4730 nlmsg_cancel(skb, nlh);
4731 return -EMSGSIZE;
4732 }
1da177e4 4733
053c095a
JB		 4734 nlmsg_end(skb, nlh);
4735 return 0;
1da177e4
LT		 4736}
4737
e21e8467 4738enum addr_type_t {
1da177e4
LT		 4739 UNICAST_ADDR,
4740 MULTICAST_ADDR,
4741 ANYCAST_ADDR,
4742};
4743
234b27c3
ED		 4744/* called with rcu_read_lock() */
4745static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4746 struct netlink_callback *cb, enum addr_type_t type,
4747 int s_ip_idx, int *p_ip_idx)
4748{
234b27c3
ED		 4749 struct ifmcaddr6 *ifmca;
4750 struct ifacaddr6 *ifaca;
4751 int err = 1;
4752 int ip_idx = *p_ip_idx;
4753
4754 read_lock_bh(&idev->lock);
4755 switch (type) {
502a2ffd 4756 case UNICAST_ADDR: {
4757 struct inet6_ifaddr *ifa;
4758
234b27c3 4759 /* unicast address incl. temp addr */
502a2ffd 4760 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4761 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4762 continue;
4763 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4764 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4765 cb->nlh->nlmsg_seq,
4766 RTM_NEWADDR,
4767 NLM_F_MULTI);
053c095a 4768 if (err < 0)
234b27c3 4769 break;
63998ac2 4770 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4771 }
4772 break;
502a2ffd 4773 }
234b27c3
ED		 4774 case MULTICAST_ADDR:
4775 /* multicast address */
4776 for (ifmca = idev->mc_list; ifmca;
4777 ifmca = ifmca->next, ip_idx++) {
4778 if (ip_idx < s_ip_idx)
4779 continue;
4780 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4781 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4782 cb->nlh->nlmsg_seq,
4783 RTM_GETMULTICAST,
4784 NLM_F_MULTI);
053c095a 4785 if (err < 0)
234b27c3
ED		 4786 break;
4787 }
4788 break;
4789 case ANYCAST_ADDR:
4790 /* anycast address */
4791 for (ifaca = idev->ac_list; ifaca;
4792 ifaca = ifaca->aca_next, ip_idx++) {
4793 if (ip_idx < s_ip_idx)
4794 continue;
4795 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4796 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4797 cb->nlh->nlmsg_seq,
4798 RTM_GETANYCAST,
4799 NLM_F_MULTI);
053c095a 4800 if (err < 0)
234b27c3
ED		 4801 break;
4802 }
4803 break;
4804 default:
4805 break;
4806 }
4807 read_unlock_bh(&idev->lock);
4808 *p_ip_idx = ip_idx;
4809 return err;
4810}
4811
1da177e4
LT		 4812static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4813 enum addr_type_t type)
4814{
234b27c3
ED		 4815 struct net *net = sock_net(skb->sk);
4816 int h, s_h;
1da177e4
LT		 4817 int idx, ip_idx;
4818 int s_idx, s_ip_idx;
1da177e4 4819 struct net_device *dev;
234b27c3
ED		 4820 struct inet6_dev *idev;
4821 struct hlist_head *head;
1ab1457c 4822
234b27c3
ED		 4823 s_h = cb->args[0];
4824 s_idx = idx = cb->args[1];
4825 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4826
234b27c3 4827 rcu_read_lock();
63998ac2 4828 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4829 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4830 idx = 0;
4831 head = &net->dev_index_head[h];
b67bfe0d 4832 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4833 if (idx < s_idx)
4834 goto cont;
4b97efdf 4835 if (h > s_h || idx > s_idx)
234b27c3
ED		 4836 s_ip_idx = 0;
4837 ip_idx = 0;
e21e8467
SH		 4838 idev = __in6_dev_get(dev);
4839 if (!idev)
234b27c3
ED		 4840 goto cont;
4841
4842 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4843 s_ip_idx, &ip_idx) < 0)
234b27c3 4844 goto done;
7562f876 4845cont:
234b27c3
ED		 4846 idx++;
4847 }
1da177e4 4848 }
234b27c3
ED		 4849done:
4850 rcu_read_unlock();
4851 cb->args[0] = h;
4852 cb->args[1] = idx;
4853 cb->args[2] = ip_idx;
4854
1da177e4
LT		 4855 return skb->len;
4856}
4857
4858static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4859{
4860 enum addr_type_t type = UNICAST_ADDR;
b854272b 4861
1da177e4
LT		 4862 return inet6_dump_addr(skb, cb, type);
4863}
4864
4865static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4866{
4867 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4868
1da177e4
LT		 4869 return inet6_dump_addr(skb, cb, type);
4870}
4871
4872
4873static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4874{
4875 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4876
1da177e4
LT		 4877 return inet6_dump_addr(skb, cb, type);
4878}
4879
661d2967 4880static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4881{
3b1e0a65 4882 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4883 struct ifaddrmsg *ifm;
4884 struct nlattr *tb[IFA_MAX+1];
caeaba79 4885 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4886 struct net_device *dev = NULL;
4887 struct inet6_ifaddr *ifa;
4888 struct sk_buff *skb;
6c223828
NT		 4889 int err;
4890
1b29fc2c
TG		 4891 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4892 if (err < 0)
4893 goto errout;
4894
caeaba79 4895 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
63159f29 4896 if (!addr) {
1b29fc2c
TG		 4897 err = -EINVAL;
4898 goto errout;
6c223828 4899 }
6c223828 4900
1b29fc2c 4901 ifm = nlmsg_data(nlh);
6c223828 4902 if (ifm->ifa_index)
6fda7350 4903 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4904
e21e8467
SH		 4905 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4906 if (!ifa) {
1b29fc2c
TG		 4907 err = -EADDRNOTAVAIL;
4908 goto errout;
4909 }
6c223828 4910
e21e8467
SH		 4911 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4912 if (!skb) {
6c223828 4913 err = -ENOBUFS;
1b29fc2c 4914 goto errout_ifa;
6c223828
NT		 4915 }
4916
15e47304 4917 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4918 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4919 if (err < 0) {
4920 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4921 WARN_ON(err == -EMSGSIZE);
4922 kfree_skb(skb);
4923 goto errout_ifa;
4924 }
15e47304 4925 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4926errout_ifa:
6c223828 4927 in6_ifa_put(ifa);
1b29fc2c 4928errout:
6c223828 4929 return err;
6c223828
NT		 4930}
4931
1da177e4
LT		 4932static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4933{
4934 struct sk_buff *skb;
c346dca1 4935 struct net *net = dev_net(ifa->idev->dev);
5d620266 4936 int err = -ENOBUFS;
1da177e4 4937
f784ad3d
MB		 4938 /* Don't send DELADDR notification for TENTATIVE address,
4939 * since NEWADDR notification is sent only after removing
4940 * TENTATIVE flag.
4941 */
4942 if (ifa->flags & IFA_F_TENTATIVE && event == RTM_DELADDR)
4943 return;
4944
0ab6803b 4945 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 4946 if (!skb)
5d620266
TG		 4947 goto errout;
4948
4949 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4950 if (err < 0) {
4951 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4952 WARN_ON(err == -EMSGSIZE);
4953 kfree_skb(skb);
4954 goto errout;
4955 }
1ce85fe4
PNA		 4956 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4957 return;
5d620266
TG		 4958errout:
4959 if (err < 0)
6fda7350 4960 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4961}
4962
b6f99a21 4963static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4964 __s32 *array, int bytes)
4965{
04561c1f
TG		 4966 BUG_ON(bytes < (DEVCONF_MAX * 4));
4967
1da177e4
LT		 4968 memset(array, 0, bytes);
4969 array[DEVCONF_FORWARDING] = cnf->forwarding;
4970 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4971 array[DEVCONF_MTU6] = cnf->mtu6;
4972 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4973 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4974 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4975 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4976 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4977 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4978 jiffies_to_msecs(cnf->rtr_solicit_interval);
bd11f074
MŻ		 4979 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
4980 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
93908d19
TG		 4981 array[DEVCONF_RTR_SOLICIT_DELAY] =
4982 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4983 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4984 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4985 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4986 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4987 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4988 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4989 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4990 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4991 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4992 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4993 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4994 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 4995 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 4996 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4997#ifdef CONFIG_IPV6_ROUTER_PREF
4998 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4999 array[DEVCONF_RTR_PROBE_INTERVAL] =
5000 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 5001#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 5002 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
09c884d4
YH		 5003 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5004#endif
930d6ff2 5005#endif
fbea49e1 5006 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 5007 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 5008#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5009 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 5010 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 5011#endif
7bc570c8
YH		 5012#ifdef CONFIG_IPV6_MROUTE
5013 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5014#endif
778d80be 5015 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 5016 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 5017 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 5018 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 5019 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 5020 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 5021 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 5022 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 5023 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 5024 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 5025 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 5026 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 5027 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1ababeba 5028 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
bf355b8d
DL		 5029#ifdef CONFIG_IPV6_SEG6_HMAC
5030 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5031#endif
adc176c5 5032 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
d35a00b8 5033 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
df789fe7 5034 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
1da177e4
LT		 5035}
5036
b382b191
TG		 5037static inline size_t inet6_ifla6_size(void)
5038{
5039 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5040 + nla_total_size(sizeof(struct ifla_cacheinfo))
5041 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5042 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 5043 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5044 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 5045}
5046
339bf98f
TG		 5047static inline size_t inet6_if_nlmsg_size(void)
5048{
5049 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5050 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5051 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5052 + nla_total_size(4) /* IFLA_MTU */
5053 + nla_total_size(4) /* IFLA_LINK */
0344338b 5054 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 5055 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 5056}
c5396a31 5057
be281e55 5058static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
aca05671 5059 int bytes)
7f7d9a6b
HX		 5060{
5061 int i;
aca05671 5062 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
7f7d9a6b
HX		 5063 BUG_ON(pad < 0);
5064
5065 /* Use put_unaligned() because stats may not be aligned for u64. */
aca05671
JH		 5066 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5067 for (i = 1; i < ICMP6_MIB_MAX; i++)
be281e55 5068 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b 5069
aca05671 5070 memset(&stats[ICMP6_MIB_MAX], 0, pad);
7f7d9a6b
HX		 5071}
5072
698365fa 5073static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 5074 int bytes, size_t syncpoff)
4ce3c183 5075{
a3a77372
R		 5076 int i, c;
5077 u64 buff[IPSTATS_MIB_MAX];
5078 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5079
4ce3c183
ED		 5080 BUG_ON(pad < 0);
5081
a3a77372
R		 5082 memset(buff, 0, sizeof(buff));
5083 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 5084
a3a77372
R		 5085 for_each_possible_cpu(c) {
5086 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5087 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5088 }
5089
5090 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5091 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 5092}
5093
7f7d9a6b
HX		 5094static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5095 int bytes)
5096{
e21e8467 5097 switch (attrtype) {
7f7d9a6b 5098 case IFLA_INET6_STATS:
a3a77372
R		 5099 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5100 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 5101 break;
5102 case IFLA_INET6_ICMP6STATS:
aca05671 5103 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
7f7d9a6b
HX		 5104 break;
5105 }
5106}
5107
d5566fd7
SV		 5108static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5109 u32 ext_filter_mask)
b382b191
TG		 5110{
5111 struct nlattr *nla;
5112 struct ifla_cacheinfo ci;
5113
c78679e8
DM		 5114 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5115 goto nla_put_failure;
b382b191 5116 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 5117 ci.tstamp = cstamp_delta(idev->tstamp);
5118 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 5119 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 5120 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5121 goto nla_put_failure;
b382b191 5122 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 5123 if (!nla)
b382b191
TG		 5124 goto nla_put_failure;
5125 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5126
5127 /* XXX - MC not implemented */
5128
d5566fd7
SV		 5129 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5130 return 0;
5131
b382b191 5132 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 5133 if (!nla)
b382b191
TG		 5134 goto nla_put_failure;
5135 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5136
5137 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 5138 if (!nla)
b382b191
TG		 5139 goto nla_put_failure;
5140 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5141
f53adae4 5142 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 5143 if (!nla)
f53adae4 5144 goto nla_put_failure;
bc91b0f0 5145
d35a00b8 5146 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
bc91b0f0
JP		 5147 goto nla_put_failure;
5148
f53adae4
DB		 5149 read_lock_bh(&idev->lock);
5150 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5151 read_unlock_bh(&idev->lock);
5152
b382b191
TG		 5153 return 0;
5154
5155nla_put_failure:
5156 return -EMSGSIZE;
5157}
5158
b1974ed0
AR		 5159static size_t inet6_get_link_af_size(const struct net_device *dev,
5160 u32 ext_filter_mask)
b382b191
TG		 5161{
5162 if (!__in6_dev_get(dev))
5163 return 0;
5164
5165 return inet6_ifla6_size();
5166}
5167
d5566fd7
SV		 5168static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5169 u32 ext_filter_mask)
b382b191
TG		 5170{
5171 struct inet6_dev *idev = __in6_dev_get(dev);
5172
5173 if (!idev)
5174 return -ENODATA;
5175
d5566fd7 5176 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5177 return -EMSGSIZE;
5178
5179 return 0;
5180}
5181
f53adae4
DB		 5182static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5183{
f53adae4
DB		 5184 struct inet6_ifaddr *ifp;
5185 struct net_device *dev = idev->dev;
47e27d5e 5186 bool clear_token, update_rs = false;
dc848292 5187 struct in6_addr ll_addr;
f53adae4 5188
c15b1cca
HFS		 5189 ASSERT_RTNL();
5190
63159f29 5191 if (!token)
f53adae4 5192 return -EINVAL;
f53adae4
DB		 5193 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5194 return -EINVAL;
f53adae4
DB		 5195 if (!ipv6_accept_ra(idev))
5196 return -EINVAL;
bd11f074 5197 if (idev->cnf.rtr_solicits == 0)
f53adae4
DB		 5198 return -EINVAL;
5199
5200 write_lock_bh(&idev->lock);
5201
5202 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5203 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5204
5205 write_unlock_bh(&idev->lock);
5206
47e27d5e
DB		 5207 clear_token = ipv6_addr_any(token);
5208 if (clear_token)
5209 goto update_lft;
5210
dc848292
HFS		 5211 if (!idev->dead && (idev->if_flags & IF_READY) &&
5212 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5213 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5214 /* If we're not ready, then normal ifup will take care
5215 * of this. Otherwise, we need to request our rs here.
5216 */
5217 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5218 update_rs = true;
5219 }
f53adae4 5220
47e27d5e 5221update_lft:
f53adae4 5222 write_lock_bh(&idev->lock);
fc403832 5223
77ecaace 5224 if (update_rs) {
fc403832 5225 idev->if_flags |= IF_RS_SENT;
bd11f074
MŻ		 5226 idev->rs_interval = rfc3315_s14_backoff_init(
5227 idev->cnf.rtr_solicit_interval);
77ecaace 5228 idev->rs_probes = 1;
bd11f074 5229 addrconf_mod_rs_timer(idev, idev->rs_interval);
77ecaace 5230 }
f53adae4
DB		 5231
5232 /* Well, that's kinda nasty ... */
5233 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5234 spin_lock(&ifp->lock);
617fe29d 5235 if (ifp->tokenized) {
f53adae4
DB		 5236 ifp->valid_lft = 0;
5237 ifp->prefered_lft = 0;
5238 }
5239 spin_unlock(&ifp->lock);
5240 }
5241
5242 write_unlock_bh(&idev->lock);
b2ed64a9 5243 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 5244 addrconf_verify_rtnl();
f53adae4
DB		 5245 return 0;
5246}
5247
11b1f828
DB		 5248static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5249 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5250 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5251};
5252
5253static int inet6_validate_link_af(const struct net_device *dev,
5254 const struct nlattr *nla)
5255{
5256 struct nlattr *tb[IFLA_INET6_MAX + 1];
5257
5258 if (dev && !__in6_dev_get(dev))
5259 return -EAFNOSUPPORT;
5260
5261 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5262}
5263
d35a00b8
FJ		 5264static int check_addr_gen_mode(int mode)
5265{
5266 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5267 mode != IN6_ADDR_GEN_MODE_NONE &&
5268 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5269 mode != IN6_ADDR_GEN_MODE_RANDOM)
5270 return -EINVAL;
5271 return 1;
5272}
5273
5274static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5275 int mode)
5276{
5277 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5278 !idev->cnf.stable_secret.initialized &&
5279 !net->ipv6.devconf_dflt->stable_secret.initialized)
5280 return -EINVAL;
5281 return 1;
5282}
5283
f53adae4
DB		 5284static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5285{
5286 int err = -EINVAL;
5287 struct inet6_dev *idev = __in6_dev_get(dev);
5288 struct nlattr *tb[IFLA_INET6_MAX + 1];
5289
5290 if (!idev)
5291 return -EAFNOSUPPORT;
5292
5293 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5294 BUG();
5295
bc91b0f0 5296 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 5297 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 5298 if (err)
5299 return err;
5300 }
5301
5302 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5303 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5304
d35a00b8
FJ		 5305 if (check_addr_gen_mode(mode) < 0 ||
5306 check_stable_privacy(idev, dev_net(dev), mode) < 0)
bc91b0f0 5307 return -EINVAL;
622c81d5 5308
d35a00b8 5309 idev->cnf.addr_gen_mode = mode;
bc91b0f0
JP		 5310 err = 0;
5311 }
f53adae4
DB		 5312
5313 return err;
5314}
5315
1ab1457c 5316static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5317 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5318{
04561c1f 5319 struct net_device *dev = idev->dev;
04561c1f
TG		 5320 struct ifinfomsg *hdr;
5321 struct nlmsghdr *nlh;
5322 void *protoinfo;
04561c1f 5323
15e47304 5324 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5325 if (!nlh)
26932566 5326 return -EMSGSIZE;
04561c1f
TG		 5327
5328 hdr = nlmsg_data(nlh);
5329 hdr->ifi_family = AF_INET6;
5330 hdr->__ifi_pad = 0;
5331 hdr->ifi_type = dev->type;
5332 hdr->ifi_index = dev->ifindex;
5333 hdr->ifi_flags = dev_get_flags(dev);
5334 hdr->ifi_change = 0;
5335
c78679e8
DM		 5336 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5337 (dev->addr_len &&
5338 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5339 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5340 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5341 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5342 nla_put_u8(skb, IFLA_OPERSTATE,
5343 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5344 goto nla_put_failure;
04561c1f 5345 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 5346 if (!protoinfo)
04561c1f 5347 goto nla_put_failure;
1da177e4 5348
d5566fd7 5349 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5350 goto nla_put_failure;
1da177e4 5351
04561c1f 5352 nla_nest_end(skb, protoinfo);
053c095a
JB		 5353 nlmsg_end(skb, nlh);
5354 return 0;
1da177e4 5355
04561c1f 5356nla_put_failure:
26932566
PM		 5357 nlmsg_cancel(skb, nlh);
5358 return -EMSGSIZE;
1da177e4
LT		 5359}
5360
5361static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5362{
3b1e0a65 5363 struct net *net = sock_net(skb->sk);
84d2697d 5364 int h, s_h;
434a8a58 5365 int idx = 0, s_idx;
1da177e4
LT		 5366 struct net_device *dev;
5367 struct inet6_dev *idev;
84d2697d 5368 struct hlist_head *head;
1da177e4 5369
84d2697d
ED		 5370 s_h = cb->args[0];
5371 s_idx = cb->args[1];
5372
5373 rcu_read_lock();
5374 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5375 idx = 0;
5376 head = &net->dev_index_head[h];
b67bfe0d 5377 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5378 if (idx < s_idx)
5379 goto cont;
5380 idev = __in6_dev_get(dev);
5381 if (!idev)
5382 goto cont;
5383 if (inet6_fill_ifinfo(skb, idev,
15e47304 5384 NETLINK_CB(cb->skb).portid,
84d2697d 5385 cb->nlh->nlmsg_seq,
053c095a 5386 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5387 goto out;
7562f876 5388cont:
84d2697d
ED		 5389 idx++;
5390 }
1da177e4 5391 }
84d2697d
ED		 5392out:
5393 rcu_read_unlock();
5394 cb->args[1] = idx;
5395 cb->args[0] = h;
1da177e4
LT		 5396
5397 return skb->len;
5398}
5399
5400void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5401{
5402 struct sk_buff *skb;
c346dca1 5403 struct net *net = dev_net(idev->dev);
8d7a76c9 5404 int err = -ENOBUFS;
1ab1457c 5405
339bf98f 5406 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5407 if (!skb)
8d7a76c9
TG		 5408 goto errout;
5409
5410 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5411 if (err < 0) {
5412 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5413 WARN_ON(err == -EMSGSIZE);
5414 kfree_skb(skb);
5415 goto errout;
5416 }
5f75a104 5417 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5418 return;
8d7a76c9
TG		 5419errout:
5420 if (err < 0)
5f75a104 5421 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5422}
5423
339bf98f
TG		 5424static inline size_t inet6_prefix_nlmsg_size(void)
5425{
5426 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5427 + nla_total_size(sizeof(struct in6_addr))
5428 + nla_total_size(sizeof(struct prefix_cacheinfo));
5429}
c5396a31 5430
1da177e4 5431static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5432 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5433 int event, unsigned int flags)
1da177e4 5434{
6051e2f4
TG		 5435 struct prefixmsg *pmsg;
5436 struct nlmsghdr *nlh;
1da177e4
LT		 5437 struct prefix_cacheinfo ci;
5438
15e47304 5439 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5440 if (!nlh)
26932566 5441 return -EMSGSIZE;
6051e2f4
TG		 5442
5443 pmsg = nlmsg_data(nlh);
1da177e4 5444 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5445 pmsg->prefix_pad1 = 0;
5446 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5447 pmsg->prefix_ifindex = idev->dev->ifindex;
5448 pmsg->prefix_len = pinfo->prefix_len;
5449 pmsg->prefix_type = pinfo->type;
8a47077a 5450 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5451 pmsg->prefix_flags = 0;
5452 if (pinfo->onlink)
5453 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5454 if (pinfo->autoconf)
5455 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5456
c78679e8
DM		 5457 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5458 goto nla_put_failure;
1da177e4
LT		 5459 ci.preferred_time = ntohl(pinfo->prefered);
5460 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5461 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5462 goto nla_put_failure;
053c095a
JB		 5463 nlmsg_end(skb, nlh);
5464 return 0;
1da177e4 5465
6051e2f4 5466nla_put_failure:
26932566
PM		 5467 nlmsg_cancel(skb, nlh);
5468 return -EMSGSIZE;
1da177e4
LT		 5469}
5470
1ab1457c 5471static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5472 struct prefix_info *pinfo)
5473{
5474 struct sk_buff *skb;
c346dca1 5475 struct net *net = dev_net(idev->dev);
8c384bfa 5476 int err = -ENOBUFS;
1da177e4 5477
339bf98f 5478 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5479 if (!skb)
8c384bfa
TG		 5480 goto errout;
5481
5482 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5483 if (err < 0) {
5484 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5485 WARN_ON(err == -EMSGSIZE);
5486 kfree_skb(skb);
5487 goto errout;
5488 }
1ce85fe4
PNA		 5489 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5490 return;
8c384bfa
TG		 5491errout:
5492 if (err < 0)
6fda7350 5493 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5494}
5495
1da177e4
LT		 5496static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5497{
63998ac2
ND		 5498 struct net *net = dev_net(ifp->idev->dev);
5499
c15b1cca
HFS		 5500 if (event)
5501 ASSERT_RTNL();
5502
1da177e4
LT		 5503 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5504
5505 switch (event) {
5506 case RTM_NEWADDR:
95c385b4
NH		 5507 /*
5508 * If the address was optimistic
5509 * we inserted the route at the start of
5510 * our DAD process, so we don't need
5511 * to do it again
5512 */
5513 if (!(ifp->rt->rt6i_node))
5514 ip6_ins_rt(ifp->rt);
1da177e4
LT		 5515 if (ifp->idev->cnf.forwarding)
5516 addrconf_join_anycast(ifp);
7996c799 5517 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 5518 addrconf_prefix_route(&ifp->peer_addr, 128,
5519 ifp->idev->dev, 0, 0);
1da177e4
LT		 5520 break;
5521 case RTM_DELADDR:
5522 if (ifp->idev->cnf.forwarding)
5523 addrconf_leave_anycast(ifp);
5524 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5525 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 5526 struct rt6_info *rt;
caeaba79 5527
e7478dfc
ND		 5528 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5529 ifp->idev->dev, 0, 0);
8e3d5be7
MKL		 5530 if (rt)
5531 ip6_del_rt(rt);
caeaba79 5532 }
38bd10c4
DA		 5533 if (ifp->rt) {
5534 dst_hold(&ifp->rt->dst);
5535 ip6_del_rt(ifp->rt);
5536 }
705f1c86 5537 rt_genid_bump_ipv6(net);
1da177e4
LT		 5538 break;
5539 }
63998ac2 5540 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5541}
5542
5543static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5544{
8814c4b5 5545 rcu_read_lock_bh();
1da177e4
LT		 5546 if (likely(ifp->idev->dead == 0))
5547 __ipv6_ifa_notify(event, ifp);
8814c4b5 5548 rcu_read_unlock_bh();
1da177e4
LT		 5549}
5550
5551#ifdef CONFIG_SYSCTL
5552
5553static
fe2c6338 5554int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5555 void __user *buffer, size_t *lenp, loff_t *ppos)
5556{
5557 int *valp = ctl->data;
5558 int val = *valp;
88af182e 5559 loff_t pos = *ppos;
fe2c6338 5560 struct ctl_table lctl;
1da177e4
LT		 5561 int ret;
5562
013d97e9
FR		 5563 /*
5564 * ctl->data points to idev->cnf.forwarding, we should
5565 * not modify it until we get the rtnl lock.
5566 */
5567 lctl = *ctl;
5568 lctl.data = &val;
5569
5570 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5571
c8fecf22 5572 if (write)
b325fddb 5573 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5574 if (ret)
5575 *ppos = pos;
1ab1457c 5576 return ret;
1da177e4
LT		 5577}
5578
77751427
ML		 5579static
5580int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5581 void __user *buffer, size_t *lenp, loff_t *ppos)
5582{
5583 struct inet6_dev *idev = ctl->extra1;
5584 int min_mtu = IPV6_MIN_MTU;
5585 struct ctl_table lctl;
5586
5587 lctl = *ctl;
5588 lctl.extra1 = &min_mtu;
5589 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5590
5591 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5592}
5593
56d417b1
BH		 5594static void dev_disable_change(struct inet6_dev *idev)
5595{
75538c2b
CW		 5596 struct netdev_notifier_info info;
5597
56d417b1
BH		 5598 if (!idev || !idev->dev)
5599 return;
5600
75538c2b 5601 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5602 if (idev->cnf.disable_ipv6)
75538c2b 5603 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5604 else
75538c2b 5605 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5606}
5607
5608static void addrconf_disable_change(struct net *net, __s32 newf)
5609{
5610 struct net_device *dev;
5611 struct inet6_dev *idev;
5612
03e4deff 5613 for_each_netdev(net, dev) {
56d417b1
BH		 5614 idev = __in6_dev_get(dev);
5615 if (idev) {
5616 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5617 idev->cnf.disable_ipv6 = newf;
5618 if (changed)
5619 dev_disable_change(idev);
5620 }
56d417b1 5621 }
56d417b1
BH		 5622}
5623
013d97e9 5624static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5625{
5626 struct net *net;
013d97e9
FR		 5627 int old;
5628
5629 if (!rtnl_trylock())
5630 return restart_syscall();
56d417b1
BH		 5631
5632 net = (struct net *)table->extra2;
013d97e9
FR		 5633 old = *p;
5634 *p = newf;
56d417b1 5635
013d97e9
FR		 5636 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5637 rtnl_unlock();
56d417b1 5638 return 0;
88af182e 5639 }
56d417b1
BH		 5640
5641 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5642 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5643 addrconf_disable_change(net, newf);
013d97e9 5644 } else if ((!newf) ^ (!old))
56d417b1
BH		 5645 dev_disable_change((struct inet6_dev *)table->extra1);
5646
5647 rtnl_unlock();
5648 return 0;
5649}
5650
5651static
fe2c6338 5652int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5653 void __user *buffer, size_t *lenp, loff_t *ppos)
5654{
5655 int *valp = ctl->data;
5656 int val = *valp;
88af182e 5657 loff_t pos = *ppos;
fe2c6338 5658 struct ctl_table lctl;
56d417b1
BH		 5659 int ret;
5660
013d97e9
FR		 5661 /*
5662 * ctl->data points to idev->cnf.disable_ipv6, we should
5663 * not modify it until we get the rtnl lock.
5664 */
5665 lctl = *ctl;
5666 lctl.data = &val;
5667
5668 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5669
5670 if (write)
5671 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5672 if (ret)
5673 *ppos = pos;
56d417b1
BH		 5674 return ret;
5675}
5676
c92d5491 5677static
5678int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5679 void __user *buffer, size_t *lenp, loff_t *ppos)
5680{
5681 int *valp = ctl->data;
5682 int ret;
5683 int old, new;
5684
5685 old = *valp;
5686 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5687 new = *valp;
5688
5689 if (write && old != new) {
5690 struct net *net = ctl->extra2;
5691
5692 if (!rtnl_trylock())
5693 return restart_syscall();
5694
5695 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
85b3daad
DA		 5696 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5697 NETCONFA_PROXY_NEIGH,
c92d5491 5698 NETCONFA_IFINDEX_DEFAULT,
5699 net->ipv6.devconf_dflt);
5700 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
85b3daad
DA		 5701 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5702 NETCONFA_PROXY_NEIGH,
c92d5491 5703 NETCONFA_IFINDEX_ALL,
5704 net->ipv6.devconf_all);
5705 else {
5706 struct inet6_dev *idev = ctl->extra1;
5707
85b3daad
DA		 5708 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5709 NETCONFA_PROXY_NEIGH,
c92d5491 5710 idev->dev->ifindex,
5711 &idev->cnf);
5712 }
5713 rtnl_unlock();
5714 }
5715
5716 return ret;
5717}
5718
d35a00b8
FJ		 5719static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5720 void __user *buffer, size_t *lenp,
5721 loff_t *ppos)
5722{
5723 int ret = 0;
5724 int new_val;
5725 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5726 struct net *net = (struct net *)ctl->extra2;
5727
8c171d6c
FJ		 5728 if (!rtnl_trylock())
5729 return restart_syscall();
5730
d35a00b8
FJ		 5731 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5732
5733 if (write) {
5734 new_val = *((int *)ctl->data);
5735
8c171d6c
FJ		 5736 if (check_addr_gen_mode(new_val) < 0) {
5737 ret = -EINVAL;
5738 goto out;
5739 }
d35a00b8
FJ		 5740
5741 /* request for default */
5742 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5743 ipv6_devconf_dflt.addr_gen_mode = new_val;
5744
5745 /* request for individual net device */
5746 } else {
5747 if (!idev)
8c171d6c 5748 goto out;
d35a00b8 5749
8c171d6c
FJ		 5750 if (check_stable_privacy(idev, net, new_val) < 0) {
5751 ret = -EINVAL;
5752 goto out;
5753 }
d35a00b8
FJ		 5754
5755 if (idev->cnf.addr_gen_mode != new_val) {
5756 idev->cnf.addr_gen_mode = new_val;
d35a00b8 5757 addrconf_dev_config(idev->dev);
d35a00b8
FJ		 5758 }
5759 }
5760 }
5761
8c171d6c
FJ		 5762out:
5763 rtnl_unlock();
5764
d35a00b8
FJ		 5765 return ret;
5766}
5767
3d1bec99
HFS		 5768static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5769 void __user *buffer, size_t *lenp,
5770 loff_t *ppos)
5771{
5772 int err;
5773 struct in6_addr addr;
5774 char str[IPV6_MAX_STRLEN];
5775 struct ctl_table lctl = *ctl;
622c81d5 5776 struct net *net = ctl->extra2;
3d1bec99
HFS		 5777 struct ipv6_stable_secret *secret = ctl->data;
5778
622c81d5
HFS		 5779 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5780 return -EIO;
5781
3d1bec99
HFS		 5782 lctl.maxlen = IPV6_MAX_STRLEN;
5783 lctl.data = str;
5784
5785 if (!rtnl_trylock())
5786 return restart_syscall();
5787
5788 if (!write && !secret->initialized) {
5789 err = -EIO;
5790 goto out;
5791 }
5792
5449a5ca
WC		 5793 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5794 if (err >= sizeof(str)) {
5795 err = -EIO;
5796 goto out;
3d1bec99
HFS		 5797 }
5798
5799 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5800 if (err || !write)
5801 goto out;
5802
5803 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5804 err = -EIO;
5805 goto out;
5806 }
5807
5808 secret->initialized = true;
5809 secret->secret = addr;
5810
622c81d5
HFS		 5811 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5812 struct net_device *dev;
5813
5814 for_each_netdev(net, dev) {
5815 struct inet6_dev *idev = __in6_dev_get(dev);
5816
5817 if (idev) {
d35a00b8 5818 idev->cnf.addr_gen_mode =
622c81d5
HFS		 5819 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5820 }
5821 }
5822 } else {
5823 struct inet6_dev *idev = ctl->extra1;
5824
d35a00b8 5825 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
622c81d5
HFS		 5826 }
5827
3d1bec99
HFS		 5828out:
5829 rtnl_unlock();
5830
5831 return err;
5832}
c92d5491 5833
35103d11
AG		 5834static
5835int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5836 int write,
5837 void __user *buffer,
5838 size_t *lenp,
5839 loff_t *ppos)
5840{
5841 int *valp = ctl->data;
5842 int val = *valp;
5843 loff_t pos = *ppos;
5844 struct ctl_table lctl;
5845 int ret;
5846
5847 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5848 * we should not modify it until we get the rtnl lock.
5849 */
5850 lctl = *ctl;
5851 lctl.data = &val;
5852
5853 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5854
5855 if (write)
5856 ret = addrconf_fixup_linkdown(ctl, valp, val);
5857 if (ret)
5858 *ppos = pos;
5859 return ret;
5860}
5861
df789fe7
DF		 5862static
5863void addrconf_set_nopolicy(struct rt6_info *rt, int action)
5864{
5865 if (rt) {
5866 if (action)
5867 rt->dst.flags |= DST_NOPOLICY;
5868 else
5869 rt->dst.flags &= ~DST_NOPOLICY;
5870 }
5871}
5872
5873static
5874void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
5875{
5876 struct inet6_ifaddr *ifa;
5877
5878 read_lock_bh(&idev->lock);
5879 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5880 spin_lock(&ifa->lock);
5881 if (ifa->rt) {
5882 struct rt6_info *rt = ifa->rt;
5883 struct fib6_table *table = rt->rt6i_table;
5884 int cpu;
5885
5886 read_lock(&table->tb6_lock);
5887 addrconf_set_nopolicy(ifa->rt, val);
5888 if (rt->rt6i_pcpu) {
5889 for_each_possible_cpu(cpu) {
5890 struct rt6_info **rtp;
5891
5892 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
5893 addrconf_set_nopolicy(*rtp, val);
5894 }
5895 }
5896 read_unlock(&table->tb6_lock);
5897 }
5898 spin_unlock(&ifa->lock);
5899 }
5900 read_unlock_bh(&idev->lock);
5901}
5902
5903static
5904int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
5905{
5906 struct inet6_dev *idev;
5907 struct net *net;
5908
5909 if (!rtnl_trylock())
5910 return restart_syscall();
5911
5912 *valp = val;
5913
5914 net = (struct net *)ctl->extra2;
5915 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
5916 rtnl_unlock();
5917 return 0;
5918 }
5919
5920 if (valp == &net->ipv6.devconf_all->disable_policy) {
5921 struct net_device *dev;
5922
5923 for_each_netdev(net, dev) {
5924 idev = __in6_dev_get(dev);
5925 if (idev)
5926 addrconf_disable_policy_idev(idev, val);
5927 }
5928 } else {
5929 idev = (struct inet6_dev *)ctl->extra1;
5930 addrconf_disable_policy_idev(idev, val);
5931 }
5932
5933 rtnl_unlock();
5934 return 0;
5935}
5936
5937static
5938int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
5939 void __user *buffer, size_t *lenp,
5940 loff_t *ppos)
5941{
5942 int *valp = ctl->data;
5943 int val = *valp;
5944 loff_t pos = *ppos;
5945 struct ctl_table lctl;
5946 int ret;
5947
5948 lctl = *ctl;
5949 lctl.data = &val;
5950 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5951
5952 if (write && (*valp != val))
5953 ret = addrconf_disable_policy(ctl, valp, val);
5954
5955 if (ret)
5956 *ppos = pos;
5957
5958 return ret;
5959}
5960
cb4a4c69 5961static int minus_one = -1;
cb9e684e
MŻ		 5962static const int one = 1;
5963static const int two_five_five = 255;
5964
607ea7cd 5965static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 5966 {
5967 .procname = "forwarding",
5968 .data = &ipv6_devconf.forwarding,
5969 .maxlen = sizeof(int),
5970 .mode = 0644,
5971 .proc_handler = addrconf_sysctl_forward,
5972 },
5973 {
5974 .procname = "hop_limit",
5975 .data = &ipv6_devconf.hop_limit,
5976 .maxlen = sizeof(int),
5977 .mode = 0644,
cb9e684e
MŻ		 5978 .proc_handler = proc_dointvec_minmax,
5979 .extra1 = (void *)&one,
5980 .extra2 = (void *)&two_five_five,
5df1f77f
KK		 5981 },
5982 {
5983 .procname = "mtu",
5984 .data = &ipv6_devconf.mtu6,
5985 .maxlen = sizeof(int),
5986 .mode = 0644,
5987 .proc_handler = addrconf_sysctl_mtu,
5988 },
5989 {
5990 .procname = "accept_ra",
5991 .data = &ipv6_devconf.accept_ra,
5992 .maxlen = sizeof(int),
5993 .mode = 0644,
5994 .proc_handler = proc_dointvec,
5995 },
5996 {
5997 .procname = "accept_redirects",
5998 .data = &ipv6_devconf.accept_redirects,
5999 .maxlen = sizeof(int),
6000 .mode = 0644,
6001 .proc_handler = proc_dointvec,
6002 },
6003 {
6004 .procname = "autoconf",
6005 .data = &ipv6_devconf.autoconf,
6006 .maxlen = sizeof(int),
6007 .mode = 0644,
6008 .proc_handler = proc_dointvec,
6009 },
6010 {
6011 .procname = "dad_transmits",
6012 .data = &ipv6_devconf.dad_transmits,
6013 .maxlen = sizeof(int),
6014 .mode = 0644,
6015 .proc_handler = proc_dointvec,
6016 },
6017 {
6018 .procname = "router_solicitations",
6019 .data = &ipv6_devconf.rtr_solicits,
6020 .maxlen = sizeof(int),
6021 .mode = 0644,
cb4a4c69
MŻ		 6022 .proc_handler = proc_dointvec_minmax,
6023 .extra1 = &minus_one,
5df1f77f
KK		 6024 },
6025 {
6026 .procname = "router_solicitation_interval",
6027 .data = &ipv6_devconf.rtr_solicit_interval,
6028 .maxlen = sizeof(int),
6029 .mode = 0644,
6030 .proc_handler = proc_dointvec_jiffies,
6031 },
bd11f074
MŻ		 6032 {
6033 .procname = "router_solicitation_max_interval",
6034 .data = &ipv6_devconf.rtr_solicit_max_interval,
6035 .maxlen = sizeof(int),
6036 .mode = 0644,
6037 .proc_handler = proc_dointvec_jiffies,
6038 },
5df1f77f
KK		 6039 {
6040 .procname = "router_solicitation_delay",
6041 .data = &ipv6_devconf.rtr_solicit_delay,
6042 .maxlen = sizeof(int),
6043 .mode = 0644,
6044 .proc_handler = proc_dointvec_jiffies,
6045 },
6046 {
6047 .procname = "force_mld_version",
6048 .data = &ipv6_devconf.force_mld_version,
6049 .maxlen = sizeof(int),
6050 .mode = 0644,
6051 .proc_handler = proc_dointvec,
6052 },
6053 {
6054 .procname = "mldv1_unsolicited_report_interval",
6055 .data =
6056 &ipv6_devconf.mldv1_unsolicited_report_interval,
6057 .maxlen = sizeof(int),
6058 .mode = 0644,
6059 .proc_handler = proc_dointvec_ms_jiffies,
6060 },
6061 {
6062 .procname = "mldv2_unsolicited_report_interval",
6063 .data =
6064 &ipv6_devconf.mldv2_unsolicited_report_interval,
6065 .maxlen = sizeof(int),
6066 .mode = 0644,
6067 .proc_handler = proc_dointvec_ms_jiffies,
6068 },
6069 {
6070 .procname = "use_tempaddr",
6071 .data = &ipv6_devconf.use_tempaddr,
6072 .maxlen = sizeof(int),
6073 .mode = 0644,
6074 .proc_handler = proc_dointvec,
6075 },
6076 {
6077 .procname = "temp_valid_lft",
6078 .data = &ipv6_devconf.temp_valid_lft,
6079 .maxlen = sizeof(int),
6080 .mode = 0644,
6081 .proc_handler = proc_dointvec,
6082 },
6083 {
6084 .procname = "temp_prefered_lft",
6085 .data = &ipv6_devconf.temp_prefered_lft,
6086 .maxlen = sizeof(int),
6087 .mode = 0644,
6088 .proc_handler = proc_dointvec,
6089 },
6090 {
6091 .procname = "regen_max_retry",
6092 .data = &ipv6_devconf.regen_max_retry,
6093 .maxlen = sizeof(int),
6094 .mode = 0644,
6095 .proc_handler = proc_dointvec,
6096 },
6097 {
6098 .procname = "max_desync_factor",
6099 .data = &ipv6_devconf.max_desync_factor,
6100 .maxlen = sizeof(int),
6101 .mode = 0644,
6102 .proc_handler = proc_dointvec,
6103 },
6104 {
6105 .procname = "max_addresses",
6106 .data = &ipv6_devconf.max_addresses,
6107 .maxlen = sizeof(int),
6108 .mode = 0644,
6109 .proc_handler = proc_dointvec,
6110 },
6111 {
6112 .procname = "accept_ra_defrtr",
6113 .data = &ipv6_devconf.accept_ra_defrtr,
6114 .maxlen = sizeof(int),
6115 .mode = 0644,
6116 .proc_handler = proc_dointvec,
6117 },
6118 {
6119 .procname = "accept_ra_min_hop_limit",
6120 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6121 .maxlen = sizeof(int),
6122 .mode = 0644,
6123 .proc_handler = proc_dointvec,
6124 },
6125 {
6126 .procname = "accept_ra_pinfo",
6127 .data = &ipv6_devconf.accept_ra_pinfo,
6128 .maxlen = sizeof(int),
6129 .mode = 0644,
6130 .proc_handler = proc_dointvec,
6131 },
930d6ff2 6132#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 6133 {
6134 .procname = "accept_ra_rtr_pref",
6135 .data = &ipv6_devconf.accept_ra_rtr_pref,
6136 .maxlen = sizeof(int),
6137 .mode = 0644,
6138 .proc_handler = proc_dointvec,
6139 },
6140 {
6141 .procname = "router_probe_interval",
6142 .data = &ipv6_devconf.rtr_probe_interval,
6143 .maxlen = sizeof(int),
6144 .mode = 0644,
6145 .proc_handler = proc_dointvec_jiffies,
6146 },
fa03ef38 6147#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b
JS		 6148 {
6149 .procname = "accept_ra_rt_info_min_plen",
6150 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6151 .maxlen = sizeof(int),
6152 .mode = 0644,
6153 .proc_handler = proc_dointvec,
6154 },
5df1f77f
KK		 6155 {
6156 .procname = "accept_ra_rt_info_max_plen",
6157 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6158 .maxlen = sizeof(int),
6159 .mode = 0644,
6160 .proc_handler = proc_dointvec,
6161 },
09c884d4 6162#endif
930d6ff2 6163#endif
5df1f77f
KK		 6164 {
6165 .procname = "proxy_ndp",
6166 .data = &ipv6_devconf.proxy_ndp,
6167 .maxlen = sizeof(int),
6168 .mode = 0644,
6169 .proc_handler = addrconf_sysctl_proxy_ndp,
6170 },
6171 {
6172 .procname = "accept_source_route",
6173 .data = &ipv6_devconf.accept_source_route,
6174 .maxlen = sizeof(int),
6175 .mode = 0644,
6176 .proc_handler = proc_dointvec,
6177 },
95c385b4 6178#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 6179 {
6180 .procname = "optimistic_dad",
6181 .data = &ipv6_devconf.optimistic_dad,
6182 .maxlen = sizeof(int),
6183 .mode = 0644,
6184 .proc_handler = proc_dointvec,
6185 },
6186 {
6187 .procname = "use_optimistic",
6188 .data = &ipv6_devconf.use_optimistic,
6189 .maxlen = sizeof(int),
6190 .mode = 0644,
6191 .proc_handler = proc_dointvec,
6192 },
7bc570c8
YH		 6193#endif
6194#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 6195 {
6196 .procname = "mc_forwarding",
6197 .data = &ipv6_devconf.mc_forwarding,
6198 .maxlen = sizeof(int),
6199 .mode = 0444,
6200 .proc_handler = proc_dointvec,
6201 },
95c385b4 6202#endif
5df1f77f
KK		 6203 {
6204 .procname = "disable_ipv6",
6205 .data = &ipv6_devconf.disable_ipv6,
6206 .maxlen = sizeof(int),
6207 .mode = 0644,
6208 .proc_handler = addrconf_sysctl_disable,
6209 },
6210 {
6211 .procname = "accept_dad",
6212 .data = &ipv6_devconf.accept_dad,
6213 .maxlen = sizeof(int),
6214 .mode = 0644,
6215 .proc_handler = proc_dointvec,
6216 },
6217 {
6218 .procname = "force_tllao",
6219 .data = &ipv6_devconf.force_tllao,
6220 .maxlen = sizeof(int),
6221 .mode = 0644,
6222 .proc_handler = proc_dointvec
6223 },
6224 {
6225 .procname = "ndisc_notify",
6226 .data = &ipv6_devconf.ndisc_notify,
6227 .maxlen = sizeof(int),
6228 .mode = 0644,
6229 .proc_handler = proc_dointvec
6230 },
6231 {
6232 .procname = "suppress_frag_ndisc",
6233 .data = &ipv6_devconf.suppress_frag_ndisc,
6234 .maxlen = sizeof(int),
6235 .mode = 0644,
6236 .proc_handler = proc_dointvec
6237 },
6238 {
6239 .procname = "accept_ra_from_local",
6240 .data = &ipv6_devconf.accept_ra_from_local,
6241 .maxlen = sizeof(int),
6242 .mode = 0644,
6243 .proc_handler = proc_dointvec,
6244 },
6245 {
6246 .procname = "accept_ra_mtu",
6247 .data = &ipv6_devconf.accept_ra_mtu,
6248 .maxlen = sizeof(int),
6249 .mode = 0644,
6250 .proc_handler = proc_dointvec,
6251 },
6252 {
6253 .procname = "stable_secret",
6254 .data = &ipv6_devconf.stable_secret,
6255 .maxlen = IPV6_MAX_STRLEN,
6256 .mode = 0600,
6257 .proc_handler = addrconf_sysctl_stable_secret,
6258 },
6259 {
6260 .procname = "use_oif_addrs_only",
6261 .data = &ipv6_devconf.use_oif_addrs_only,
6262 .maxlen = sizeof(int),
6263 .mode = 0644,
6264 .proc_handler = proc_dointvec,
6265 },
6266 {
6267 .procname = "ignore_routes_with_linkdown",
6268 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6269 .maxlen = sizeof(int),
6270 .mode = 0644,
6271 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6272 },
6273 {
6274 .procname = "drop_unicast_in_l2_multicast",
6275 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6276 .maxlen = sizeof(int),
6277 .mode = 0644,
6278 .proc_handler = proc_dointvec,
6279 },
6280 {
6281 .procname = "drop_unsolicited_na",
6282 .data = &ipv6_devconf.drop_unsolicited_na,
6283 .maxlen = sizeof(int),
6284 .mode = 0644,
6285 .proc_handler = proc_dointvec,
6286 },
6287 {
6288 .procname = "keep_addr_on_down",
6289 .data = &ipv6_devconf.keep_addr_on_down,
6290 .maxlen = sizeof(int),
6291 .mode = 0644,
6292 .proc_handler = proc_dointvec,
6293
6294 },
1ababeba
DL		 6295 {
6296 .procname = "seg6_enabled",
6297 .data = &ipv6_devconf.seg6_enabled,
6298 .maxlen = sizeof(int),
6299 .mode = 0644,
6300 .proc_handler = proc_dointvec,
6301 },
bf355b8d
DL		 6302#ifdef CONFIG_IPV6_SEG6_HMAC
6303 {
6304 .procname = "seg6_require_hmac",
6305 .data = &ipv6_devconf.seg6_require_hmac,
6306 .maxlen = sizeof(int),
6307 .mode = 0644,
6308 .proc_handler = proc_dointvec,
6309 },
6310#endif
adc176c5
EN		 6311 {
6312 .procname = "enhanced_dad",
6313 .data = &ipv6_devconf.enhanced_dad,
6314 .maxlen = sizeof(int),
6315 .mode = 0644,
6316 .proc_handler = proc_dointvec,
6317 },
d35a00b8
FJ		 6318 {
6319 .procname = "addr_gen_mode",
6320 .data = &ipv6_devconf.addr_gen_mode,
6321 .maxlen = sizeof(int),
6322 .mode = 0644,
6323 .proc_handler = addrconf_sysctl_addr_gen_mode,
6324 },
df789fe7
DF		 6325 {
6326 .procname = "disable_policy",
6327 .data = &ipv6_devconf.disable_policy,
6328 .maxlen = sizeof(int),
6329 .mode = 0644,
6330 .proc_handler = addrconf_sysctl_disable_policy,
6331 },
5df1f77f
KK		 6332 {
6333 /* sentinel */
6334 }
1da177e4
LT		 6335};
6336
bff16c2f 6337static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 6338 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4 6339{
29c994e3 6340 int i, ifindex;
607ea7cd 6341 struct ctl_table *table;
6105e293 6342 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 6343
607ea7cd
KK		 6344 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6345 if (!table)
f68635e6
PE		 6346 goto out;
6347
607ea7cd
KK		 6348 for (i = 0; table[i].data; i++) {
6349 table[i].data += (char *)p - (char *)&ipv6_devconf;
cb9e684e
MŻ		 6350 /* If one of these is already set, then it is not safe to
6351 * overwrite either of them: this makes proc_dointvec_minmax
6352 * usable.
6353 */
6354 if (!table[i].extra1 && !table[i].extra2) {
6355 table[i].extra1 = idev; /* embedded; no ref */
6356 table[i].extra2 = net;
6357 }
1da177e4 6358 }
1da177e4 6359
6105e293 6360 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 6361
607ea7cd
KK		 6362 p->sysctl_header = register_net_sysctl(net, path, table);
6363 if (!p->sysctl_header)
6105e293 6364 goto free;
f68635e6 6365
29c994e3
ND		 6366 if (!strcmp(dev_name, "all"))
6367 ifindex = NETCONFA_IFINDEX_ALL;
6368 else if (!strcmp(dev_name, "default"))
6369 ifindex = NETCONFA_IFINDEX_DEFAULT;
6370 else
6371 ifindex = idev->dev->ifindex;
85b3daad
DA		 6372 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6373 ifindex, p);
95897312 6374 return 0;
1da177e4 6375
f68635e6 6376free:
607ea7cd 6377 kfree(table);
f68635e6 6378out:
95897312 6379 return -ENOBUFS;
1da177e4
LT		 6380}
6381
23452170
DA		 6382static void __addrconf_sysctl_unregister(struct net *net,
6383 struct ipv6_devconf *p, int ifindex)
408c4768 6384{
607ea7cd 6385 struct ctl_table *table;
408c4768 6386
607ea7cd 6387 if (!p->sysctl_header)
408c4768
PE		 6388 return;
6389
607ea7cd
KK		 6390 table = p->sysctl_header->ctl_table_arg;
6391 unregister_net_sysctl_table(p->sysctl_header);
6392 p->sysctl_header = NULL;
6393 kfree(table);
23452170
DA		 6394
6395 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
408c4768
PE		 6396}
6397
a317a2f1 6398static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 6399{
a317a2f1
WC		 6400 int err;
6401
6402 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6403 return -EINVAL;
6404
6405 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6406 &ndisc_ifinfo_sysctl_change);
6407 if (err)
6408 return err;
6409 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6410 idev, &idev->cnf);
6411 if (err)
6412 neigh_sysctl_unregister(idev->nd_parms);
6413
6414 return err;
f52295a9
PE		 6415}
6416
408c4768 6417static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 6418{
23452170
DA		 6419 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6420 idev->dev->ifindex);
408c4768 6421 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 6422}
6423
6424
6425#endif
6426
2c8c1e72 6427static int __net_init addrconf_init_net(struct net *net)
e0da5a48 6428{
a79ca223 6429 int err = -ENOMEM;
e0da5a48
PE		 6430 struct ipv6_devconf *all, *dflt;
6431
a79ca223 6432 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 6433 if (!all)
a79ca223 6434 goto err_alloc_all;
e0da5a48 6435
a79ca223 6436 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 6437 if (!dflt)
a79ca223 6438 goto err_alloc_dflt;
e0da5a48 6439
a79ca223
HZ		 6440 /* these will be inherited by all namespaces */
6441 dflt->autoconf = ipv6_defaults.autoconf;
6442 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 6443
3d1bec99
HFS		 6444 dflt->stable_secret.initialized = false;
6445 all->stable_secret.initialized = false;
6446
e0da5a48
PE		 6447 net->ipv6.devconf_all = all;
6448 net->ipv6.devconf_dflt = dflt;
6449
6450#ifdef CONFIG_SYSCTL
f8572d8f 6451 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 6452 if (err < 0)
6453 goto err_reg_all;
6454
f8572d8f 6455 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 6456 if (err < 0)
6457 goto err_reg_dflt;
6458#endif
6459 return 0;
6460
6461#ifdef CONFIG_SYSCTL
6462err_reg_dflt:
23452170 6463 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
e0da5a48
PE		 6464err_reg_all:
6465 kfree(dflt);
6466#endif
6467err_alloc_dflt:
6468 kfree(all);
6469err_alloc_all:
6470 return err;
6471}
6472
2c8c1e72 6473static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 6474{
6475#ifdef CONFIG_SYSCTL
23452170
DA		 6476 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6477 NETCONFA_IFINDEX_DEFAULT);
6478 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6479 NETCONFA_IFINDEX_ALL);
e0da5a48 6480#endif
73cf0e92 6481 kfree(net->ipv6.devconf_dflt);
6482 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 6483}
6484
6485static struct pernet_operations addrconf_ops = {
6486 .init = addrconf_init_net,
6487 .exit = addrconf_exit_net,
6488};
6489
207895fd 6490static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 6491 .family = AF_INET6,
6492 .fill_link_af = inet6_fill_link_af,
6493 .get_link_af_size = inet6_get_link_af_size,
11b1f828 6494 .validate_link_af = inet6_validate_link_af,
f53adae4 6495 .set_link_af = inet6_set_link_af,
b382b191
TG		 6496};
6497
1da177e4
LT		 6498/*
6499 * Init / cleanup code
6500 */
6501
6502int __init addrconf_init(void)
6503{
a317a2f1 6504 struct inet6_dev *idev;
c2e21293 6505 int i, err;
2a8cc6c8 6506
e21e8467
SH		 6507 err = ipv6_addr_label_init();
6508 if (err < 0) {
f3213831
JP		 6509 pr_crit("%s: cannot initialize default policy table: %d\n",
6510 __func__, err);
2cc6d2bf 6511 goto out;
2a8cc6c8 6512 }
1da177e4 6513
2cc6d2bf
NH		 6514 err = register_pernet_subsys(&addrconf_ops);
6515 if (err < 0)
6516 goto out_addrlabel;
e0da5a48 6517
c15b1cca
HFS		 6518 addrconf_wq = create_workqueue("ipv6_addrconf");
6519 if (!addrconf_wq) {
6520 err = -ENOMEM;
6521 goto out_nowq;
6522 }
6523
1da177e4
LT		 6524 /* The addrconf netdev notifier requires that loopback_dev
6525 * has it's ipv6 private information allocated and setup
6526 * before it can bring up and give link-local addresses
6527 * to other devices which are up.
6528 *
6529 * Unfortunately, loopback_dev is not necessarily the first
6530 * entry in the global dev_base list of net devices. In fact,
6531 * it is likely to be the very last entry on that list.
6532 * So this causes the notifier registry below to try and
6533 * give link-local addresses to all devices besides loopback_dev
6534 * first, then loopback_dev, which cases all the non-loopback_dev
6535 * devices to fail to get a link-local address.
6536 *
6537 * So, as a temporary fix, allocate the ipv6 structure for
6538 * loopback_dev first by hand.
6539 * Longer term, all of the dependencies ipv6 has upon the loopback
6540 * device and it being up should be removed.
6541 */
6542 rtnl_lock();
a317a2f1 6543 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 6544 rtnl_unlock();
a317a2f1
WC		 6545 if (IS_ERR(idev)) {
6546 err = PTR_ERR(idev);
e0da5a48 6547 goto errlo;
a317a2f1 6548 }
1da177e4 6549
c2e21293 6550 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6551 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6552
1da177e4
LT		 6553 register_netdevice_notifier(&ipv6_dev_notf);
6554
c15b1cca 6555 addrconf_verify();
c127ea2c 6556
3678a9d8 6557 rtnl_af_register(&inet6_ops);
b382b191 6558
c7ac8679
GR		 6559 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6560 NULL);
c127ea2c
TG		 6561 if (err < 0)
6562 goto errout;
6563
6564 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 6565 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6566 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6567 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6568 inet6_dump_ifaddr, NULL);
6569 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6570 inet6_dump_ifmcaddr, NULL);
6571 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6572 inet6_dump_ifacaddr, NULL);
76f8f6cb 6573 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 6574 inet6_netconf_dump_devconf, NULL);
c127ea2c 6575
2a8cc6c8
YH		 6576 ipv6_addr_label_rtnl_register();
6577
1da177e4 6578 return 0;
c127ea2c 6579errout:
b382b191 6580 rtnl_af_unregister(&inet6_ops);
c127ea2c 6581 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6582errlo:
c15b1cca
HFS		 6583 destroy_workqueue(addrconf_wq);
6584out_nowq:
e0da5a48 6585 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 6586out_addrlabel:
6587 ipv6_addr_label_cleanup();
6588out:
c127ea2c 6589 return err;
1da177e4
LT		 6590}
6591
09f7709f 6592void addrconf_cleanup(void)
1da177e4 6593{
176c39af 6594 struct net_device *dev;
1da177e4
LT		 6595 int i;
6596
6597 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6598 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 6599 ipv6_addr_label_cleanup();
1da177e4
LT		 6600
6601 rtnl_lock();
6602
b382b191
TG		 6603 __rtnl_af_unregister(&inet6_ops);
6604
176c39af
DL		 6605 /* clean dev list */
6606 for_each_netdev(&init_net, dev) {
6607 if (__in6_dev_get(dev) == NULL)
6608 continue;
6609 addrconf_ifdown(dev, 1);
6610 }
6611 addrconf_ifdown(init_net.loopback_dev, 2);
6612
1da177e4
LT		 6613 /*
6614 * Check hash table.
6615 */
5c578aed 6616 spin_lock_bh(&addrconf_hash_lock);
c2e21293 6617 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6618 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 6619 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 6620 cancel_delayed_work(&addr_chk_work);
1da177e4 6621 rtnl_unlock();
c15b1cca
HFS		 6622
6623 destroy_workqueue(addrconf_wq);
1da177e4 6624}
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