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net: ipv6: Add sysctl for minimum prefix len acceptable in RIOs.
[linux-2.6-block.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
174cd4b1 46#include <linux/sched/signal.h>
1da177e4
LT		 47#include <linux/socket.h>
48#include <linux/sockios.h>
1da177e4 49#include <linux/net.h>
3d1bec99 50#include <linux/inet.h>
1da177e4
LT		 51#include <linux/in6.h>
52#include <linux/netdevice.h>
1823730f 53#include <linux/if_addr.h>
1da177e4
LT		 54#include <linux/if_arp.h>
55#include <linux/if_arcnet.h>
56#include <linux/if_infiniband.h>
57#include <linux/route.h>
58#include <linux/inetdevice.h>
59#include <linux/init.h>
5a0e3ad6 60#include <linux/slab.h>
1da177e4
LT		 61#ifdef CONFIG_SYSCTL
62#include <linux/sysctl.h>
63#endif
4fc268d2 64#include <linux/capability.h>
1da177e4
LT		 65#include <linux/delay.h>
66#include <linux/notifier.h>
543537bd 67#include <linux/string.h>
ddbe5032 68#include <linux/hash.h>
1da177e4 69
457c4cbc 70#include <net/net_namespace.h>
1da177e4
LT		 71#include <net/sock.h>
72#include <net/snmp.h>
73
5241c2d7 74#include <net/6lowpan.h>
cb6bf355 75#include <net/firewire.h>
1da177e4
LT		 76#include <net/ipv6.h>
77#include <net/protocol.h>
78#include <net/ndisc.h>
79#include <net/ip6_route.h>
80#include <net/addrconf.h>
81#include <net/tcp.h>
82#include <net/ip.h>
5d620266 83#include <net/netlink.h>
f24e3d65 84#include <net/pkt_sched.h>
ca254490 85#include <net/l3mdev.h>
1da177e4
LT		 86#include <linux/if_tunnel.h>
87#include <linux/rtnetlink.h>
f3a1bfb1 88#include <linux/netconf.h>
1da177e4 89#include <linux/random.h>
e21e8467 90#include <linux/uaccess.h>
7f7d9a6b 91#include <asm/unaligned.h>
1da177e4
LT		 92
93#include <linux/proc_fs.h>
94#include <linux/seq_file.h>
bc3b2d7f 95#include <linux/export.h>
1da177e4
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
136ba622 552 if ((all || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 553 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
554 goto nla_put_failure;
b1afce95 555#ifdef CONFIG_IPV6_MROUTE
136ba622 556 if ((all || type == NETCONFA_MC_FORWARDING) &&
d67b8c61
ND		 557 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
558 devconf->mc_forwarding) < 0)
559 goto nla_put_failure;
b1afce95 560#endif
136ba622 561 if ((all || type == NETCONFA_PROXY_NEIGH) &&
c92d5491 562 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
563 goto nla_put_failure;
564
136ba622 565 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
35103d11
AG		 566 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
567 devconf->ignore_routes_with_linkdown) < 0)
568 goto nla_put_failure;
569
053c095a
JB		 570 nlmsg_end(skb, nlh);
571 return 0;
f3a1bfb1
ND		 572
573nla_put_failure:
574 nlmsg_cancel(skb, nlh);
575 return -EMSGSIZE;
576}
577
d67b8c61
ND		 578void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
579 struct ipv6_devconf *devconf)
f3a1bfb1
ND		 580{
581 struct sk_buff *skb;
582 int err = -ENOBUFS;
583
927265bc 584 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
63159f29 585 if (!skb)
f3a1bfb1
ND		 586 goto errout;
587
588 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
589 RTM_NEWNETCONF, 0, type);
590 if (err < 0) {
591 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
592 WARN_ON(err == -EMSGSIZE);
593 kfree_skb(skb);
594 goto errout;
595 }
927265bc 596 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
f3a1bfb1
ND		 597 return;
598errout:
bd779028 599 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 600}
601
76f8f6cb
ND		 602static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
603 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
604 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 605 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
35103d11 606 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
76f8f6cb
ND		 607};
608
609static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 610 struct nlmsghdr *nlh)
76f8f6cb
ND		 611{
612 struct net *net = sock_net(in_skb->sk);
613 struct nlattr *tb[NETCONFA_MAX+1];
614 struct netconfmsg *ncm;
615 struct sk_buff *skb;
616 struct ipv6_devconf *devconf;
617 struct inet6_dev *in6_dev;
618 struct net_device *dev;
619 int ifindex;
620 int err;
621
622 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
623 devconf_ipv6_policy);
624 if (err < 0)
625 goto errout;
626
a97eb33f 627 err = -EINVAL;
76f8f6cb
ND		 628 if (!tb[NETCONFA_IFINDEX])
629 goto errout;
630
631 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
632 switch (ifindex) {
633 case NETCONFA_IFINDEX_ALL:
634 devconf = net->ipv6.devconf_all;
635 break;
636 case NETCONFA_IFINDEX_DEFAULT:
637 devconf = net->ipv6.devconf_dflt;
638 break;
639 default:
640 dev = __dev_get_by_index(net, ifindex);
63159f29 641 if (!dev)
76f8f6cb
ND		 642 goto errout;
643 in6_dev = __in6_dev_get(dev);
63159f29 644 if (!in6_dev)
76f8f6cb
ND		 645 goto errout;
646 devconf = &in6_dev->cnf;
647 break;
648 }
649
650 err = -ENOBUFS;
136ba622 651 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
63159f29 652 if (!skb)
76f8f6cb
ND		 653 goto errout;
654
655 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
656 NETLINK_CB(in_skb).portid,
657 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
136ba622 658 NETCONFA_ALL);
76f8f6cb
ND		 659 if (err < 0) {
660 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
661 WARN_ON(err == -EMSGSIZE);
662 kfree_skb(skb);
663 goto errout;
664 }
665 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
666errout:
667 return err;
668}
669
7a674200
ND		 670static int inet6_netconf_dump_devconf(struct sk_buff *skb,
671 struct netlink_callback *cb)
672{
673 struct net *net = sock_net(skb->sk);
674 int h, s_h;
675 int idx, s_idx;
676 struct net_device *dev;
677 struct inet6_dev *idev;
678 struct hlist_head *head;
679
680 s_h = cb->args[0];
681 s_idx = idx = cb->args[1];
682
683 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
684 idx = 0;
685 head = &net->dev_index_head[h];
686 rcu_read_lock();
63998ac2
ND		 687 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
688 net->dev_base_seq;
7a674200
ND		 689 hlist_for_each_entry_rcu(dev, head, index_hlist) {
690 if (idx < s_idx)
691 goto cont;
692 idev = __in6_dev_get(dev);
693 if (!idev)
694 goto cont;
695
696 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
697 &idev->cnf,
698 NETLINK_CB(cb->skb).portid,
699 cb->nlh->nlmsg_seq,
700 RTM_NEWNETCONF,
701 NLM_F_MULTI,
136ba622 702 NETCONFA_ALL) < 0) {
7a674200
ND		 703 rcu_read_unlock();
704 goto done;
705 }
63998ac2 706 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 707cont:
708 idx++;
709 }
710 rcu_read_unlock();
711 }
712 if (h == NETDEV_HASHENTRIES) {
713 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
714 net->ipv6.devconf_all,
715 NETLINK_CB(cb->skb).portid,
716 cb->nlh->nlmsg_seq,
717 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 718 NETCONFA_ALL) < 0)
7a674200
ND		 719 goto done;
720 else
721 h++;
722 }
723 if (h == NETDEV_HASHENTRIES + 1) {
724 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
725 net->ipv6.devconf_dflt,
726 NETLINK_CB(cb->skb).portid,
727 cb->nlh->nlmsg_seq,
728 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 729 NETCONFA_ALL) < 0)
7a674200
ND		 730 goto done;
731 else
732 h++;
733 }
734done:
735 cb->args[0] = h;
736 cb->args[1] = idx;
737
738 return skb->len;
739}
740
1da177e4
LT		 741#ifdef CONFIG_SYSCTL
742static void dev_forward_change(struct inet6_dev *idev)
743{
744 struct net_device *dev;
745 struct inet6_ifaddr *ifa;
1da177e4
LT		 746
747 if (!idev)
748 return;
749 dev = idev->dev;
0187bdfb
BH		 750 if (idev->cnf.forwarding)
751 dev_disable_lro(dev);
1a940835 752 if (dev->flags & IFF_MULTICAST) {
2c5e8933 753 if (idev->cnf.forwarding) {
f3ee4010 754 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 755 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
756 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
757 } else {
f3ee4010 758 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 759 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
760 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
761 }
1da177e4 762 }
502a2ffd 763
764 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 765 if (ifa->flags&IFA_F_TENTATIVE)
766 continue;
1da177e4
LT		 767 if (idev->cnf.forwarding)
768 addrconf_join_anycast(ifa);
769 else
770 addrconf_leave_anycast(ifa);
771 }
f3a1bfb1
ND		 772 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
773 dev->ifindex, &idev->cnf);
1da177e4
LT		 774}
775
776
e186932b 777static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 778{
779 struct net_device *dev;
780 struct inet6_dev *idev;
781
4acd4945 782 for_each_netdev(net, dev) {
1da177e4
LT		 783 idev = __in6_dev_get(dev);
784 if (idev) {
e186932b
PE		 785 int changed = (!idev->cnf.forwarding) ^ (!newf);
786 idev->cnf.forwarding = newf;
1da177e4
LT		 787 if (changed)
788 dev_forward_change(idev);
789 }
1da177e4 790 }
1da177e4 791}
c8fecf22 792
013d97e9 793static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 794{
bff16c2f 795 struct net *net;
013d97e9
FR		 796 int old;
797
798 if (!rtnl_trylock())
799 return restart_syscall();
bff16c2f
PE		 800
801 net = (struct net *)table->extra2;
013d97e9
FR		 802 old = *p;
803 *p = newf;
b325fddb 804
013d97e9 805 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1
ND		 806 if ((!newf) ^ (!old))
807 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
808 NETCONFA_IFINDEX_DEFAULT,
809 net->ipv6.devconf_dflt);
013d97e9
FR		 810 rtnl_unlock();
811 return 0;
88af182e 812 }
c8fecf22 813
e186932b 814 if (p == &net->ipv6.devconf_all->forwarding) {
d26c638c
ND		 815 int old_dflt = net->ipv6.devconf_dflt->forwarding;
816
e186932b 817 net->ipv6.devconf_dflt->forwarding = newf;
d26c638c
ND		 818 if ((!newf) ^ (!old_dflt))
819 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
820 NETCONFA_IFINDEX_DEFAULT,
821 net->ipv6.devconf_dflt);
822
e186932b 823 addrconf_forward_change(net, newf);
f3a1bfb1
ND		 824 if ((!newf) ^ (!old))
825 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
826 NETCONFA_IFINDEX_ALL,
827 net->ipv6.devconf_all);
013d97e9 828 } else if ((!newf) ^ (!old))
c8fecf22 829 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 830 rtnl_unlock();
c8fecf22 831
013d97e9 832 if (newf)
7b4da532 833 rt6_purge_dflt_routers(net);
b325fddb 834 return 1;
c8fecf22 835}
35103d11
AG		 836
837static void addrconf_linkdown_change(struct net *net, __s32 newf)
838{
839 struct net_device *dev;
840 struct inet6_dev *idev;
841
842 for_each_netdev(net, dev) {
843 idev = __in6_dev_get(dev);
844 if (idev) {
845 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
846
847 idev->cnf.ignore_routes_with_linkdown = newf;
848 if (changed)
849 inet6_netconf_notify_devconf(dev_net(dev),
850 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
851 dev->ifindex,
852 &idev->cnf);
853 }
854 }
855}
856
857static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
858{
859 struct net *net;
860 int old;
861
862 if (!rtnl_trylock())
863 return restart_syscall();
864
865 net = (struct net *)table->extra2;
866 old = *p;
867 *p = newf;
868
869 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
870 if ((!newf) ^ (!old))
871 inet6_netconf_notify_devconf(net,
872 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
873 NETCONFA_IFINDEX_DEFAULT,
874 net->ipv6.devconf_dflt);
875 rtnl_unlock();
876 return 0;
877 }
878
879 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
880 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
881 addrconf_linkdown_change(net, newf);
882 if ((!newf) ^ (!old))
883 inet6_netconf_notify_devconf(net,
884 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
885 NETCONFA_IFINDEX_ALL,
886 net->ipv6.devconf_all);
887 }
888 rtnl_unlock();
889
890 return 1;
891}
892
1da177e4
LT		 893#endif
894
5c578aed 895/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 896void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
897{
c2e21293 898 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 899
1da177e4 900#ifdef NET_REFCNT_DEBUG
91df42be 901 pr_debug("%s\n", __func__);
1da177e4
LT		 902#endif
903
904 in6_dev_put(ifp->idev);
905
c15b1cca
HFS		 906 if (cancel_delayed_work(&ifp->dad_work))
907 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
908 ifp);
1da177e4 909
e9d3e084 910 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 911 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 912 return;
913 }
94e187c0 914 ip6_rt_put(ifp->rt);
1da177e4 915
e5785985 916 kfree_rcu(ifp, rcu);
1da177e4
LT		 917}
918
e55ffac6
BH		 919static void
920ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
921{
502a2ffd 922 struct list_head *p;
8a6ce0c0 923 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 924
925 /*
926 * Each device address list is sorted in order of scope -
927 * global before linklocal.
928 */
502a2ffd 929 list_for_each(p, &idev->addr_list) {
930 struct inet6_ifaddr *ifa
931 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 932 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 933 break;
934 }
935
b54c9b98 936 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 937}
938
ddbe5032 939static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 940{
ddbe5032 941 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 942}
943
1da177e4
LT		 944/* On success it returns ifp with increased reference count */
945
946static struct inet6_ifaddr *
3f8f5298
JP		 947ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
948 const struct in6_addr *peer_addr, int pfxlen,
8a226b2c 949 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
1da177e4 950{
df789fe7 951 struct net *net = dev_net(idev->dev);
1da177e4
LT		 952 struct inet6_ifaddr *ifa = NULL;
953 struct rt6_info *rt;
3a88a81d 954 unsigned int hash;
1da177e4 955 int err = 0;
d68b8270
YH		 956 int addr_type = ipv6_addr_type(addr);
957
958 if (addr_type == IPV6_ADDR_ANY ||
959 addr_type & IPV6_ADDR_MULTICAST ||
960 (!(idev->dev->flags & IFF_LOOPBACK) &&
961 addr_type & IPV6_ADDR_LOOPBACK))
962 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 963
8814c4b5 964 rcu_read_lock_bh();
1da177e4
LT		 965 if (idev->dead) {
966 err = -ENODEV; /*XXX*/
967 goto out2;
968 }
969
56d417b1 970 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 971 err = -EACCES;
972 goto out2;
973 }
974
5c578aed 975 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 976
977 /* Ignore adding duplicate addresses on an interface */
c346dca1 978 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ba3542e1 979 ADBG("ipv6_add_addr: already assigned\n");
1da177e4
LT		 980 err = -EEXIST;
981 goto out;
982 }
983
322f74a4 984 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4 985
63159f29 986 if (!ifa) {
ba3542e1 987 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 988 err = -ENOBUFS;
989 goto out;
990 }
991
8f031519 992 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 993 if (IS_ERR(rt)) {
994 err = PTR_ERR(rt);
995 goto out;
996 }
997
df789fe7
DF		 998 if (net->ipv6.devconf_all->disable_policy ||
999 idev->cnf.disable_policy)
1000 rt->dst.flags |= DST_NOPOLICY;
1001
bba24896
JP		 1002 neigh_parms_data_state_setall(idev->nd_parms);
1003
4e3fd7a0 1004 ifa->addr = *addr;
3f8f5298
JP		 1005 if (peer_addr)
1006 ifa->peer_addr = *peer_addr;
1da177e4
LT		 1007
1008 spin_lock_init(&ifa->lock);
c15b1cca 1009 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 1010 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 1011 ifa->scope = scope;
1012 ifa->prefix_len = pfxlen;
1013 ifa->flags = flags | IFA_F_TENTATIVE;
8a226b2c
JB		 1014 ifa->valid_lft = valid_lft;
1015 ifa->prefered_lft = prefered_lft;
1da177e4 1016 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 1017 ifa->tokenized = false;
1da177e4 1018
57f5f544
KF		 1019 ifa->rt = rt;
1020
1da177e4
LT		 1021 ifa->idev = idev;
1022 in6_dev_hold(idev);
1023 /* For caller */
1024 in6_ifa_hold(ifa);
1025
1026 /* Add to big hash table */
ddbe5032 1027 hash = inet6_addr_hash(addr);
1da177e4 1028
5c578aed 1029 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 1030 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 1031
1032 write_lock(&idev->lock);
1033 /* Add to inet6_dev unicast addr list. */
e55ffac6 1034 ipv6_link_dev_addr(idev, ifa);
1da177e4 1035
1da177e4 1036 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 1037 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 1038 in6_ifa_hold(ifa);
1039 }
1da177e4 1040
1da177e4
LT		 1041 in6_ifa_hold(ifa);
1042 write_unlock(&idev->lock);
1043out2:
8814c4b5 1044 rcu_read_unlock_bh();
1da177e4 1045
fd92833a 1046 if (likely(err == 0))
f88c91dd 1047 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 1048 else {
1049 kfree(ifa);
1050 ifa = ERR_PTR(err);
1051 }
1052
1053 return ifa;
1054out:
5c578aed 1055 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 1056 goto out2;
1057}
1058
5b84efec
TH		 1059enum cleanup_prefix_rt_t {
1060 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1061 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1062 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1063};
1064
1065/*
1066 * Check, whether the prefix for ifp would still need a prefix route
1067 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1068 * constants.
1069 *
1070 * 1) we don't purge prefix if address was not permanent.
1071 * prefix is managed by its own lifetime.
1072 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1073 * 3) if there are no addresses, delete prefix.
1074 * 4) if there are still other permanent address(es),
1075 * corresponding prefix is still permanent.
1076 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1077 * don't purge the prefix, assume user space is managing it.
1078 * 6) otherwise, update prefix lifetime to the
1079 * longest valid lifetime among the corresponding
1080 * addresses on the device.
1081 * Note: subsequent RA will update lifetime.
1082 **/
1083static enum cleanup_prefix_rt_t
1084check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1085{
1086 struct inet6_ifaddr *ifa;
1087 struct inet6_dev *idev = ifp->idev;
1088 unsigned long lifetime;
1089 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1090
1091 *expires = jiffies;
1092
1093 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1094 if (ifa == ifp)
1095 continue;
1096 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1097 ifp->prefix_len))
1098 continue;
1099 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1100 return CLEANUP_PREFIX_RT_NOP;
1101
1102 action = CLEANUP_PREFIX_RT_EXPIRE;
1103
1104 spin_lock(&ifa->lock);
1105
1106 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1107 /*
1108 * Note: Because this address is
1109 * not permanent, lifetime <
1110 * LONG_MAX / HZ here.
1111 */
1112 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1113 *expires = ifa->tstamp + lifetime * HZ;
1114 spin_unlock(&ifa->lock);
1115 }
1116
1117 return action;
1118}
1119
1120static void
1121cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1122{
1123 struct rt6_info *rt;
1124
1125 rt = addrconf_get_prefix_route(&ifp->addr,
1126 ifp->prefix_len,
1127 ifp->idev->dev,
1128 0, RTF_GATEWAY | RTF_DEFAULT);
1129 if (rt) {
1130 if (del_rt)
1131 ip6_del_rt(rt);
1132 else {
1133 if (!(rt->rt6i_flags & RTF_EXPIRES))
1134 rt6_set_expires(rt, expires);
1135 ip6_rt_put(rt);
1136 }
1137 }
1138}
1139
1140
1da177e4
LT		 1141/* This function wants to get referenced ifp and releases it before return */
1142
1143static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1144{
4c5ff6a6 1145 int state;
5b84efec
TH		 1146 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1147 unsigned long expires;
1da177e4 1148
c15b1cca
HFS		 1149 ASSERT_RTNL();
1150
8e8e676d 1151 spin_lock_bh(&ifp->lock);
4c5ff6a6 1152 state = ifp->state;
e9d3e084 1153 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1154 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1155
1156 if (state == INET6_IFADDR_STATE_DEAD)
1157 goto out;
1da177e4 1158
5c578aed 1159 spin_lock_bh(&addrconf_hash_lock);
1160 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1161 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1162
5b84efec 1163 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1164
1da177e4 1165 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1166 list_del(&ifp->tmp_list);
1167 if (ifp->ifpub) {
1168 in6_ifa_put(ifp->ifpub);
1169 ifp->ifpub = NULL;
1da177e4 1170 }
372e6c8f 1171 __in6_ifa_put(ifp);
1da177e4 1172 }
1da177e4 1173
5b84efec
TH		 1174 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1175 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1176
5b84efec
TH		 1177 list_del_init(&ifp->if_list);
1178 __in6_ifa_put(ifp);
1179
1180 write_unlock_bh(&ifp->idev->lock);
1da177e4 1181
c15b1cca 1182 addrconf_del_dad_work(ifp);
b2238566 1183
1da177e4
LT		 1184 ipv6_ifa_notify(RTM_DELADDR, ifp);
1185
f88c91dd 1186 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1187
5b84efec
TH		 1188 if (action != CLEANUP_PREFIX_RT_NOP) {
1189 cleanup_prefix_route(ifp, expires,
1190 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1191 }
1192
c3968a85
DW		 1193 /* clean up prefsrc entries */
1194 rt6_remove_prefsrc(ifp);
4c5ff6a6 1195out:
1da177e4
LT		 1196 in6_ifa_put(ifp);
1197}
1198
1da177e4
LT		 1199static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1200{
1201 struct inet6_dev *idev = ifp->idev;
1202 struct in6_addr addr, *tmpaddr;
76f793e3 1203 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1204 unsigned long regen_advance;
1da177e4
LT		 1205 int tmp_plen;
1206 int ret = 0;
95c385b4 1207 u32 addr_flags;
76f793e3 1208 unsigned long now = jiffies;
76506a98 1209 long max_desync_factor;
7aa8e63f 1210 s32 cnf_temp_preferred_lft;
1da177e4 1211
53bd6749 1212 write_lock_bh(&idev->lock);
1da177e4
LT		 1213 if (ift) {
1214 spin_lock_bh(&ift->lock);
1215 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1216 spin_unlock_bh(&ift->lock);
1217 tmpaddr = &addr;
1218 } else {
1219 tmpaddr = NULL;
1220 }
1221retry:
1222 in6_dev_hold(idev);
1223 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1224 write_unlock_bh(&idev->lock);
f3213831 1225 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1226 in6_dev_put(idev);
1227 ret = -1;
1228 goto out;
1229 }
1230 spin_lock_bh(&ifp->lock);
1231 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1232 idev->cnf.use_tempaddr = -1; /*XXX*/
1233 spin_unlock_bh(&ifp->lock);
53bd6749 1234 write_unlock_bh(&idev->lock);
f3213831
JP		 1235 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1236 __func__);
1da177e4
LT		 1237 in6_dev_put(idev);
1238 ret = -1;
1239 goto out;
1240 }
1241 in6_ifa_hold(ifp);
1242 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
9d6280da 1243 ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1244 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1245 age = (now - ifp->tstamp) / HZ;
76506a98
JB		 1246
1247 regen_advance = idev->cnf.regen_max_retry *
1248 idev->cnf.dad_transmits *
1249 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1250
1251 /* recalculate max_desync_factor each time and update
1252 * idev->desync_factor if it's larger
1253 */
7aa8e63f 1254 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
76506a98
JB		 1255 max_desync_factor = min_t(__u32,
1256 idev->cnf.max_desync_factor,
7aa8e63f 1257 cnf_temp_preferred_lft - regen_advance);
76506a98
JB		 1258
1259 if (unlikely(idev->desync_factor > max_desync_factor)) {
1260 if (max_desync_factor > 0) {
1261 get_random_bytes(&idev->desync_factor,
1262 sizeof(idev->desync_factor));
1263 idev->desync_factor %= max_desync_factor;
1264 } else {
1265 idev->desync_factor = 0;
1266 }
1267 }
1268
1da177e4
LT		 1269 tmp_valid_lft = min_t(__u32,
1270 ifp->valid_lft,
7a876b0e 1271 idev->cnf.temp_valid_lft + age);
7aa8e63f 1272 tmp_prefered_lft = cnf_temp_preferred_lft + age -
76506a98 1273 idev->desync_factor;
76506a98 1274 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1da177e4 1275 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1276 tmp_tstamp = ifp->tstamp;
1277 spin_unlock_bh(&ifp->lock);
1278
53bd6749 1279 write_unlock_bh(&idev->lock);
95c385b4 1280
eac55bf9
BB		 1281 /* A temporary address is created only if this calculated Preferred
1282 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1283 * an implementation must not create a temporary address with a zero
1284 * Preferred Lifetime.
ecab6701
HK		 1285 * Use age calculation as in addrconf_verify to avoid unnecessary
1286 * temporary addresses being generated.
eac55bf9 1287 */
ecab6701
HK		 1288 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1289 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1290 in6_ifa_put(ifp);
1291 in6_dev_put(idev);
1292 ret = -1;
1293 goto out;
1294 }
1295
95c385b4
NH		 1296 addr_flags = IFA_F_TEMPORARY;
1297 /* set in addrconf_prefix_rcv() */
1298 if (ifp->flags & IFA_F_OPTIMISTIC)
1299 addr_flags |= IFA_F_OPTIMISTIC;
1300
4b08a8f1
HFS		 1301 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1302 ipv6_addr_scope(&addr), addr_flags,
1303 tmp_valid_lft, tmp_prefered_lft);
1304 if (IS_ERR(ift)) {
1da177e4
LT		 1305 in6_ifa_put(ifp);
1306 in6_dev_put(idev);
f3213831 1307 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1308 tmpaddr = &addr;
53bd6749 1309 write_lock_bh(&idev->lock);
1da177e4
LT		 1310 goto retry;
1311 }
1312
1313 spin_lock_bh(&ift->lock);
1314 ift->ifpub = ifp;
76f793e3 1315 ift->cstamp = now;
1da177e4
LT		 1316 ift->tstamp = tmp_tstamp;
1317 spin_unlock_bh(&ift->lock);
1318
cf22f9a2 1319 addrconf_dad_start(ift);
1da177e4
LT		 1320 in6_ifa_put(ift);
1321 in6_dev_put(idev);
1322out:
1323 return ret;
1324}
1da177e4
LT		 1325
1326/*
072047e4 1327 * Choose an appropriate source address (RFC3484)
1da177e4 1328 */
a9b05723
YH		 1329enum {
1330 IPV6_SADDR_RULE_INIT = 0,
1331 IPV6_SADDR_RULE_LOCAL,
1332 IPV6_SADDR_RULE_SCOPE,
1333 IPV6_SADDR_RULE_PREFERRED,
1334#ifdef CONFIG_IPV6_MIP6
1335 IPV6_SADDR_RULE_HOA,
1336#endif
1337 IPV6_SADDR_RULE_OIF,
1338 IPV6_SADDR_RULE_LABEL,
a9b05723 1339 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1340 IPV6_SADDR_RULE_ORCHID,
1341 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1342#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1343 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1344#endif
a9b05723
YH		 1345 IPV6_SADDR_RULE_MAX
1346};
1347
072047e4 1348struct ipv6_saddr_score {
a9b05723
YH		 1349 int rule;
1350 int addr_type;
1351 struct inet6_ifaddr *ifa;
1352 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1353 int scopedist;
1354 int matchlen;
072047e4
YH		 1355};
1356
a9b05723 1357struct ipv6_saddr_dst {
9acd9f3a 1358 const struct in6_addr *addr;
a9b05723
YH		 1359 int ifindex;
1360 int scope;
1361 int label;
7cbca67c 1362 unsigned int prefs;
a9b05723 1363};
072047e4 1364
b6f99a21 1365static inline int ipv6_saddr_preferred(int type)
1da177e4 1366{
45bb0060 1367 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1368 return 1;
1369 return 0;
1da177e4
LT		 1370}
1371
7fd2561e
EK		 1372static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1373{
1374#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1375 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1376#else
1377 return false;
1378#endif
1379}
1380
3de23255
BT		 1381static int ipv6_get_saddr_eval(struct net *net,
1382 struct ipv6_saddr_score *score,
a9b05723
YH		 1383 struct ipv6_saddr_dst *dst,
1384 int i)
1385{
1386 int ret;
1387
1388 if (i <= score->rule) {
1389 switch (i) {
1390 case IPV6_SADDR_RULE_SCOPE:
1391 ret = score->scopedist;
1392 break;
1393 case IPV6_SADDR_RULE_PREFIX:
1394 ret = score->matchlen;
1395 break;
1396 default:
1397 ret = !!test_bit(i, score->scorebits);
1398 }
1399 goto out;
1400 }
1401
1402 switch (i) {
1403 case IPV6_SADDR_RULE_INIT:
1404 /* Rule 0: remember if hiscore is not ready yet */
1405 ret = !!score->ifa;
1406 break;
1407 case IPV6_SADDR_RULE_LOCAL:
1408 /* Rule 1: Prefer same address */
1409 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1410 break;
1411 case IPV6_SADDR_RULE_SCOPE:
1412 /* Rule 2: Prefer appropriate scope
1413 *
1414 * ret
1415 * ^
1416 * -1 | d 15
1417 * ---+--+-+---> scope
1418 * |
1419 * | d is scope of the destination.
1420 * B-d | \
1421 * | \ <- smaller scope is better if
db9c7c39 1422 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1423 * | ret = B - scope (-1 <= scope >= d <= 15).
1424 * d-C-1 | /
1425 * |/ <- greater is better
1426 * -C / if scope is not enough for destination.
1427 * /| ret = scope - C (-1 <= d < scope <= 15).
1428 *
1429 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1430 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1431 * Assume B = 0 and we get C > 29.
1432 */
1433 ret = __ipv6_addr_src_scope(score->addr_type);
1434 if (ret >= dst->scope)
1435 ret = -ret;
1436 else
1437 ret -= 128; /* 30 is enough */
1438 score->scopedist = ret;
1439 break;
1440 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1441 {
a9b05723 1442 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1443 u8 avoid = IFA_F_DEPRECATED;
1444
1445 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1446 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1447 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1448 !(score->ifa->flags & avoid);
a9b05723 1449 break;
7fd2561e 1450 }
a9b05723
YH		 1451#ifdef CONFIG_IPV6_MIP6
1452 case IPV6_SADDR_RULE_HOA:
7cbca67c 1453 {
a9b05723 1454 /* Rule 4: Prefer home address */
7cbca67c
YH		 1455 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1456 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1457 break;
7cbca67c 1458 }
a9b05723
YH		 1459#endif
1460 case IPV6_SADDR_RULE_OIF:
1461 /* Rule 5: Prefer outgoing interface */
1462 ret = (!dst->ifindex ||
1463 dst->ifindex == score->ifa->idev->dev->ifindex);
1464 break;
1465 case IPV6_SADDR_RULE_LABEL:
1466 /* Rule 6: Prefer matching label */
3de23255
BT		 1467 ret = ipv6_addr_label(net,
1468 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1469 score->ifa->idev->dev->ifindex) == dst->label;
1470 break;
a9b05723 1471 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1472 {
a9b05723 1473 /* Rule 7: Prefer public address
25985edc 1474 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1475 */
7cbca67c
YH		 1476 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1477 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1478 score->ifa->idev->cnf.use_tempaddr >= 2;
1479 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1480 break;
7cbca67c 1481 }
a9b05723
YH		 1482 case IPV6_SADDR_RULE_ORCHID:
1483 /* Rule 8-: Prefer ORCHID vs ORCHID or
1484 * non-ORCHID vs non-ORCHID
1485 */
1486 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1487 ipv6_addr_orchid(dst->addr));
1488 break;
1489 case IPV6_SADDR_RULE_PREFIX:
1490 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1491 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1492 if (ret > score->ifa->prefix_len)
1493 ret = score->ifa->prefix_len;
1494 score->matchlen = ret;
a9b05723 1495 break;
7fd2561e
EK		 1496#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1497 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1498 /* Optimistic addresses still have lower precedence than other
1499 * preferred addresses.
1500 */
1501 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1502 break;
1503#endif
a9b05723
YH		 1504 default:
1505 ret = 0;
1506 }
1507
1508 if (ret)
1509 __set_bit(i, score->scorebits);
1510 score->rule = i;
1511out:
1512 return ret;
1513}
1514
c0b8da1e
YH		 1515static int __ipv6_dev_get_saddr(struct net *net,
1516 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1517 struct inet6_dev *idev,
1518 struct ipv6_saddr_score *scores,
1519 int hiscore_idx)
9131f3de 1520{
c0b8da1e 1521 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de
YH		 1522
1523 read_lock_bh(&idev->lock);
1524 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1525 int i;
1526
1527 /*
1528 * - Tentative Address (RFC2462 section 5.4)
1529 * - A tentative address is not considered
1530 * "assigned to an interface" in the traditional
1531 * sense, unless it is also flagged as optimistic.
1532 * - Candidate Source Address (section 4)
1533 * - In any case, anycast addresses, multicast
1534 * addresses, and the unspecified address MUST
1535 * NOT be included in a candidate set.
1536 */
1537 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1538 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1539 continue;
1540
1541 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1542
1543 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1544 score->addr_type & IPV6_ADDR_MULTICAST)) {
1545 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1546 idev->dev->name);
1547 continue;
1548 }
1549
1550 score->rule = -1;
1551 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1552
1553 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1554 int minihiscore, miniscore;
1555
1556 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1557 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1558
1559 if (minihiscore > miniscore) {
1560 if (i == IPV6_SADDR_RULE_SCOPE &&
1561 score->scopedist > 0) {
1562 /*
1563 * special case:
1564 * each remaining entry
1565 * has too small (not enough)
1566 * scope, because ifa entries
1567 * are sorted by their scope
1568 * values.
1569 */
1570 goto out;
1571 }
1572 break;
1573 } else if (minihiscore < miniscore) {
1574 if (hiscore->ifa)
1575 in6_ifa_put(hiscore->ifa);
1576
1577 in6_ifa_hold(score->ifa);
1578
1579 swap(hiscore, score);
c0b8da1e 1580 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1581
1582 /* restore our iterator */
1583 score->ifa = hiscore->ifa;
1584
1585 break;
1586 }
1587 }
1588 }
1589out:
1590 read_unlock_bh(&idev->lock);
c0b8da1e 1591 return hiscore_idx;
9131f3de
YH		 1592}
1593
afbac601
DA		 1594static int ipv6_get_saddr_master(struct net *net,
1595 const struct net_device *dst_dev,
1596 const struct net_device *master,
1597 struct ipv6_saddr_dst *dst,
1598 struct ipv6_saddr_score *scores,
1599 int hiscore_idx)
1600{
1601 struct inet6_dev *idev;
1602
1603 idev = __in6_dev_get(dst_dev);
1604 if (idev)
1605 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1606 scores, hiscore_idx);
1607
1608 idev = __in6_dev_get(master);
1609 if (idev)
1610 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1611 scores, hiscore_idx);
1612
1613 return hiscore_idx;
1614}
1615
b3f644fc 1616int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1617 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1618 struct in6_addr *saddr)
1da177e4 1619{
c0b8da1e 1620 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1621 struct ipv6_saddr_dst dst;
9131f3de 1622 struct inet6_dev *idev;
072047e4 1623 struct net_device *dev;
a9b05723 1624 int dst_type;
9131f3de 1625 bool use_oif_addr = false;
c0b8da1e 1626 int hiscore_idx = 0;
1da177e4 1627
a9b05723
YH		 1628 dst_type = __ipv6_addr_type(daddr);
1629 dst.addr = daddr;
1630 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1631 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1632 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1633 dst.prefs = prefs;
a9b05723 1634
c0b8da1e
YH		 1635 scores[hiscore_idx].rule = -1;
1636 scores[hiscore_idx].ifa = NULL;
1da177e4 1637
8814c4b5 1638 rcu_read_lock();
1da177e4 1639
9131f3de
YH		 1640 /* Candidate Source Address (section 4)
1641 * - multicast and link-local destination address,
1642 * the set of candidate source address MUST only
1643 * include addresses assigned to interfaces
1644 * belonging to the same link as the outgoing
1645 * interface.
1646 * (- For site-local destination addresses, the
1647 * set of candidate source addresses MUST only
1648 * include addresses assigned to interfaces
1649 * belonging to the same site as the outgoing
1650 * interface.)
3985e8a3
EK		 1651 * - "It is RECOMMENDED that the candidate source addresses
1652 * be the set of unicast addresses assigned to the
1653 * interface that will be used to send to the destination
1654 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1655 */
1656 if (dst_dev) {
3985e8a3 1657 idev = __in6_dev_get(dst_dev);
9131f3de 1658 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1659 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1660 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1661 use_oif_addr = true;
1662 }
1663 }
a9b05723 1664
9131f3de 1665 if (use_oif_addr) {
c0b8da1e 1666 if (idev)
c15df306 1667 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de 1668 } else {
afbac601
DA		 1669 const struct net_device *master;
1670 int master_idx = 0;
1671
1672 /* if dst_dev exists and is enslaved to an L3 device, then
1673 * prefer addresses from dst_dev and then the master over
1674 * any other enslaved devices in the L3 domain.
1675 */
1676 master = l3mdev_master_dev_rcu(dst_dev);
1677 if (master) {
1678 master_idx = master->ifindex;
1679
1680 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1681 master, &dst,
1682 scores, hiscore_idx);
1683
1684 if (scores[hiscore_idx].ifa)
1685 goto out;
1686 }
1687
9131f3de 1688 for_each_netdev_rcu(net, dev) {
afbac601
DA		 1689 /* only consider addresses on devices in the
1690 * same L3 domain
1691 */
1692 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1693 continue;
9131f3de
YH		 1694 idev = __in6_dev_get(dev);
1695 if (!idev)
072047e4 1696 continue;
c15df306 1697 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1698 }
1699 }
afbac601
DA		 1700
1701out:
8814c4b5 1702 rcu_read_unlock();
1da177e4 1703
c0b8da1e 1704 hiscore = &scores[hiscore_idx];
a9b05723 1705 if (!hiscore->ifa)
072047e4 1706 return -EADDRNOTAVAIL;
1ab1457c 1707
4e3fd7a0 1708 *saddr = hiscore->ifa->addr;
a9b05723 1709 in6_ifa_put(hiscore->ifa);
072047e4 1710 return 0;
1da177e4 1711}
5e5f3f0f 1712EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1713
8965779d 1714int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1715 u32 banned_flags)
b7b1bfce
HFS		 1716{
1717 struct inet6_ifaddr *ifp;
1718 int err = -EADDRNOTAVAIL;
1719
602582ca
HFS		 1720 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1721 if (ifp->scope > IFA_LINK)
1722 break;
b7b1bfce
HFS		 1723 if (ifp->scope == IFA_LINK &&
1724 !(ifp->flags & banned_flags)) {
1725 *addr = ifp->addr;
1726 err = 0;
1727 break;
1728 }
1729 }
1730 return err;
1731}
1732
95c385b4 1733int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1734 u32 banned_flags)
1da177e4
LT		 1735{
1736 struct inet6_dev *idev;
1737 int err = -EADDRNOTAVAIL;
1738
8814c4b5 1739 rcu_read_lock();
e21e8467
SH		 1740 idev = __in6_dev_get(dev);
1741 if (idev) {
1da177e4 1742 read_lock_bh(&idev->lock);
b7b1bfce 1743 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1744 read_unlock_bh(&idev->lock);
1745 }
8814c4b5 1746 rcu_read_unlock();
1da177e4
LT		 1747 return err;
1748}
1749
1750static int ipv6_count_addresses(struct inet6_dev *idev)
1751{
1752 int cnt = 0;
1753 struct inet6_ifaddr *ifp;
1754
1755 read_lock_bh(&idev->lock);
502a2ffd 1756 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1757 cnt++;
1758 read_unlock_bh(&idev->lock);
1759 return cnt;
1760}
1761
b71d1d42 1762int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1763 const struct net_device *dev, int strict)
c58da4c6
EK		 1764{
1765 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1766}
1767EXPORT_SYMBOL(ipv6_chk_addr);
1768
1769int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1770 const struct net_device *dev, int strict,
1771 u32 banned_flags)
1da177e4 1772{
eedf042a 1773 struct inet6_ifaddr *ifp;
ddbe5032 1774 unsigned int hash = inet6_addr_hash(addr);
c58da4c6 1775 u32 ifp_flags;
1da177e4 1776
5c578aed 1777 rcu_read_lock_bh();
b67bfe0d 1778 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1779 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1780 continue;
c58da4c6
EK		 1781 /* Decouple optimistic from tentative for evaluation here.
1782 * Ban optimistic addresses explicitly, when required.
1783 */
1784 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1785 ? (ifp->flags&~IFA_F_TENTATIVE)
1786 : ifp->flags;
1da177e4 1787 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1788 !(ifp_flags&banned_flags) &&
63159f29 1789 (!dev || ifp->idev->dev == dev ||
eedf042a
SH		 1790 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1791 rcu_read_unlock_bh();
1792 return 1;
1da177e4
LT		 1793 }
1794 }
5c578aed 1795
eedf042a
SH		 1796 rcu_read_unlock_bh();
1797 return 0;
1da177e4 1798}
c58da4c6 1799EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1800
3e81c6da
DM		 1801static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1802 struct net_device *dev)
1da177e4 1803{
ddbe5032 1804 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1805 struct inet6_ifaddr *ifp;
1da177e4 1806
b67bfe0d 1807 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1808 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1809 continue;
1da177e4 1810 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1811 if (!dev || ifp->idev->dev == dev)
3e81c6da 1812 return true;
1da177e4
LT		 1813 }
1814 }
3e81c6da 1815 return false;
1da177e4
LT		 1816}
1817
7df37ff3
CB		 1818/* Compares an address/prefix_len with addresses on device @dev.
1819 * If one is found it returns true.
1820 */
1821bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1822 const unsigned int prefix_len, struct net_device *dev)
1823{
1824 struct inet6_dev *idev;
1825 struct inet6_ifaddr *ifa;
1826 bool ret = false;
1827
1828 rcu_read_lock();
1829 idev = __in6_dev_get(dev);
1830 if (idev) {
1831 read_lock_bh(&idev->lock);
1832 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1833 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1834 if (ret)
1835 break;
1836 }
1837 read_unlock_bh(&idev->lock);
1838 }
1839 rcu_read_unlock();
1840
1841 return ret;
1842}
1843EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1844
b71d1d42 1845int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1846{
1847 struct inet6_dev *idev;
1848 struct inet6_ifaddr *ifa;
1849 int onlink;
1850
1851 onlink = 0;
1852 rcu_read_lock();
1853 idev = __in6_dev_get(dev);
1854 if (idev) {
1855 read_lock_bh(&idev->lock);
502a2ffd 1856 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1857 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1858 ifa->prefix_len);
1859 if (onlink)
1860 break;
1861 }
1862 read_unlock_bh(&idev->lock);
1863 }
1864 rcu_read_unlock();
1865 return onlink;
1866}
52eeeb84
YH		 1867EXPORT_SYMBOL(ipv6_chk_prefix);
1868
9acd9f3a 1869struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1870 struct net_device *dev, int strict)
1da177e4 1871{
b79d1d54 1872 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1873 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1874
5c578aed 1875 rcu_read_lock_bh();
b67bfe0d 1876 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1877 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1878 continue;
1da177e4 1879 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1880 if (!dev || ifp->idev->dev == dev ||
1da177e4 1881 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1882 result = ifp;
1da177e4
LT		 1883 in6_ifa_hold(ifp);
1884 break;
1885 }
1886 }
1887 }
5c578aed 1888 rcu_read_unlock_bh();
1da177e4 1889
b79d1d54 1890 return result;
1da177e4
LT		 1891}
1892
1da177e4
LT		 1893/* Gets referenced address, destroys ifaddr */
1894
cc411d0b 1895static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1896{
3d171f39
LR		 1897 if (dad_failed)
1898 ifp->flags |= IFA_F_DADFAILED;
1899
1da177e4
LT		 1900 if (ifp->flags&IFA_F_PERMANENT) {
1901 spin_lock_bh(&ifp->lock);
c15b1cca 1902 addrconf_del_dad_work(ifp);
1da177e4
LT		 1903 ifp->flags |= IFA_F_TENTATIVE;
1904 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1905 if (dad_failed)
1906 ipv6_ifa_notify(0, ifp);
1da177e4 1907 in6_ifa_put(ifp);
1da177e4
LT		 1908 } else if (ifp->flags&IFA_F_TEMPORARY) {
1909 struct inet6_ifaddr *ifpub;
1910 spin_lock_bh(&ifp->lock);
1911 ifpub = ifp->ifpub;
1912 if (ifpub) {
1913 in6_ifa_hold(ifpub);
1914 spin_unlock_bh(&ifp->lock);
1915 ipv6_create_tempaddr(ifpub, ifp);
1916 in6_ifa_put(ifpub);
1917 } else {
1918 spin_unlock_bh(&ifp->lock);
1919 }
1920 ipv6_del_addr(ifp);
c15b1cca 1921 } else {
1da177e4 1922 ipv6_del_addr(ifp);
c15b1cca 1923 }
1da177e4
LT		 1924}
1925
f2344a13
HX		 1926static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1927{
1928 int err = -ENOENT;
1929
8e8e676d 1930 spin_lock_bh(&ifp->lock);
f2344a13
HX		 1931 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1932 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1933 err = 0;
1934 }
8e8e676d 1935 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 1936
1937 return err;
1938}
1939
3c21edbd
YH		 1940void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1941{
1b34be74 1942 struct inet6_dev *idev = ifp->idev;
1855b7c3 1943 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 1944
853dc2e0
UB		 1945 if (addrconf_dad_end(ifp)) {
1946 in6_ifa_put(ifp);
f2344a13 1947 return;
853dc2e0 1948 }
f2344a13 1949
e87cc472
JP		 1950 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1951 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1952
5f40ef77
HFS		 1953 spin_lock_bh(&ifp->lock);
1954
1955 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1956 int scope = ifp->scope;
1957 u32 flags = ifp->flags;
1958 struct in6_addr new_addr;
1959 struct inet6_ifaddr *ifp2;
1960 u32 valid_lft, preferred_lft;
1961 int pfxlen = ifp->prefix_len;
5f40ef77
HFS		 1962 int retries = ifp->stable_privacy_retry + 1;
1963
1855b7c3 1964 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 1965 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1966 ifp->idev->dev->name);
1967 goto errdad;
1968 }
1969
1970 new_addr = ifp->addr;
1971 if (ipv6_generate_stable_address(&new_addr, retries,
1972 idev))
1973 goto errdad;
1974
1975 valid_lft = ifp->valid_lft;
1976 preferred_lft = ifp->prefered_lft;
1977
1978 spin_unlock_bh(&ifp->lock);
1b34be74 1979
5f40ef77
HFS		 1980 if (idev->cnf.max_addresses &&
1981 ipv6_count_addresses(idev) >=
1982 idev->cnf.max_addresses)
1983 goto lock_errdad;
1984
1985 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1986 ifp->idev->dev->name);
1987
1988 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1989 scope, flags, valid_lft,
1990 preferred_lft);
1991 if (IS_ERR(ifp2))
1992 goto lock_errdad;
1993
1994 spin_lock_bh(&ifp2->lock);
1995 ifp2->stable_privacy_retry = retries;
1996 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1997 spin_unlock_bh(&ifp2->lock);
1998
1855b7c3 1999 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 2000 in6_ifa_put(ifp2);
2001lock_errdad:
2002 spin_lock_bh(&ifp->lock);
1b34be74
YH		 2003 }
2004
5f40ef77 2005errdad:
c15b1cca
HFS		 2006 /* transition from _POSTDAD to _ERRDAD */
2007 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 2008 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 2009
2010 addrconf_mod_dad_work(ifp, 0);
751eb6b6 2011 in6_ifa_put(ifp);
3c21edbd 2012}
1da177e4 2013
a9ed4a29
SD		 2014/* Join to solicited addr multicast group.
2015 * caller must hold RTNL */
b71d1d42 2016void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 2017{
2018 struct in6_addr maddr;
2019
2020 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2021 return;
2022
2023 addrconf_addr_solict_mult(addr, &maddr);
2024 ipv6_dev_mc_inc(dev, &maddr);
2025}
2026
a9ed4a29 2027/* caller must hold RTNL */
b71d1d42 2028void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 2029{
2030 struct in6_addr maddr;
2031
2032 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2033 return;
2034
2035 addrconf_addr_solict_mult(addr, &maddr);
2036 __ipv6_dev_mc_dec(idev, &maddr);
2037}
2038
a9ed4a29 2039/* caller must hold RTNL */
20380731 2040static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2041{
2042 struct in6_addr addr;
c15b1cca 2043
88ad3149 2044 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 2045 return;
1da177e4
LT		 2046 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2047 if (ipv6_addr_any(&addr))
2048 return;
013b4d90 2049 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 2050}
2051
a9ed4a29 2052/* caller must hold RTNL */
20380731 2053static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2054{
2055 struct in6_addr addr;
c15b1cca 2056
88ad3149 2057 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 2058 return;
1da177e4
LT		 2059 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2060 if (ipv6_addr_any(&addr))
2061 return;
2062 __ipv6_dev_ac_dec(ifp->idev, &addr);
2063}
2064
06a4c1c5 2065static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
2066{
5241c2d7 2067 if (dev->addr_len != EUI64_ADDR_LEN)
06a4c1c5 2068 return -1;
5241c2d7 2069 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
5e98a36e 2070 eui[0] ^= 2;
06a4c1c5 2071 return 0;
2072}
2073
cb6bf355
YH		 2074static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2075{
2076 union fwnet_hwaddr *ha;
2077
2078 if (dev->addr_len != FWNET_ALEN)
2079 return -1;
2080
2081 ha = (union fwnet_hwaddr *)dev->dev_addr;
2082
2083 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2084 eui[0] ^= 2;
2085 return 0;
2086}
2087
073a8e0e
YH		 2088static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2089{
2090 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2091 if (dev->addr_len != ARCNET_ALEN)
2092 return -1;
2093 memset(eui, 0, 7);
8e5e8f30 2094 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 2095 return 0;
2096}
2097
2098static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2099{
2100 if (dev->addr_len != INFINIBAND_ALEN)
2101 return -1;
2102 memcpy(eui, dev->dev_addr + 12, 8);
2103 eui[0] |= 2;
2104 return 0;
2105}
2106
c61393ea 2107static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2108{
9af28511
SH		 2109 if (addr == 0)
2110 return -1;
dfd982ba
YH		 2111 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2112 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2113 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2114 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2115 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2116 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2117 eui[1] = 0;
2118 eui[2] = 0x5E;
2119 eui[3] = 0xFE;
2120 memcpy(eui + 4, &addr, 4);
2121 return 0;
2122}
dfd982ba
YH		 2123
2124static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2125{
2126 if (dev->priv_flags & IFF_ISATAP)
2127 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2128 return -1;
2129}
2130
aee80b54 2131static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2132{
2133 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2134}
2135
e837735e
ND		 2136static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2137{
2138 memcpy(eui, dev->perm_addr, 3);
2139 memcpy(eui + 5, dev->perm_addr + 3, 3);
2140 eui[3] = 0xFF;
2141 eui[4] = 0xFE;
2142 eui[0] ^= 2;
2143 return 0;
2144}
2145
1da177e4
LT		 2146static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2147{
2148 switch (dev->type) {
2149 case ARPHRD_ETHER:
2150 case ARPHRD_FDDI:
073a8e0e 2151 return addrconf_ifid_eui48(eui, dev);
1da177e4 2152 case ARPHRD_ARCNET:
073a8e0e 2153 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2154 case ARPHRD_INFINIBAND:
073a8e0e 2155 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2156 case ARPHRD_SIT:
dfd982ba 2157 return addrconf_ifid_sit(eui, dev);
aee80b54 2158 case ARPHRD_IPGRE:
45ce0fd1 2159 case ARPHRD_TUNNEL:
aee80b54 2160 return addrconf_ifid_gre(eui, dev);
e74bccb8 2161 case ARPHRD_6LOWPAN:
06a4c1c5 2162 return addrconf_ifid_eui64(eui, dev);
cb6bf355
YH		 2163 case ARPHRD_IEEE1394:
2164 return addrconf_ifid_ieee1394(eui, dev);
e837735e 2165 case ARPHRD_TUNNEL6:
45ce0fd1 2166 case ARPHRD_IP6GRE:
e837735e 2167 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2168 }
2169 return -1;
2170}
2171
2172static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2173{
2174 int err = -1;
2175 struct inet6_ifaddr *ifp;
2176
2177 read_lock_bh(&idev->lock);
602582ca
HFS		 2178 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2179 if (ifp->scope > IFA_LINK)
2180 break;
1da177e4
LT		 2181 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2182 memcpy(eui, ifp->addr.s6_addr+8, 8);
2183 err = 0;
2184 break;
2185 }
2186 }
2187 read_unlock_bh(&idev->lock);
2188 return err;
2189}
2190
1da177e4 2191/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
9d6280da 2192static void ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2193{
1da177e4 2194regen:
955189ef 2195 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2196 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2197
2198 /*
2199 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2200 * check if generated address is not inappropriate
2201 *
2202 * - Reserved subnet anycast (RFC 2526)
2203 * 11111101 11....11 1xxxxxxx
c7dc89c0 2204 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2205 * 00-00-5E-FE-xx-xx-xx-xx
2206 * - value 0
2207 * - XXX: already assigned to an address on the device
2208 */
1ab1457c 2209 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2210 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2211 (idev->rndid[7]&0x80))
2212 goto regen;
2213 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2214 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2215 goto regen;
2216 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2217 goto regen;
2218 }
1da177e4
LT		 2219}
2220
9d6280da 2221static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2222{
1da177e4 2223 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
9d6280da 2224 ipv6_regen_rndid(idev);
1da177e4 2225}
1da177e4
LT		 2226
2227/*
2228 * Add prefix route.
2229 */
2230
2231static void
2232addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2233 unsigned long expires, u32 flags)
1da177e4 2234{
86872cb5 2235 struct fib6_config cfg = {
ca254490 2236 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
86872cb5
TG		 2237 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2238 .fc_ifindex = dev->ifindex,
2239 .fc_expires = expires,
2240 .fc_dst_len = plen,
2241 .fc_flags = RTF_UP | flags,
c346dca1 2242 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2243 .fc_protocol = RTPROT_KERNEL,
86872cb5 2244 };
1da177e4 2245
4e3fd7a0 2246 cfg.fc_dst = *pfx;
1da177e4
LT		 2247
2248 /* Prevent useless cloning on PtP SIT.
2249 This thing is done here expecting that the whole
2250 class of non-broadcast devices need not cloning.
2251 */
07a93626 2252#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2253 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2254 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2255#endif
1da177e4 2256
86872cb5 2257 ip6_route_add(&cfg);
1da177e4
LT		 2258}
2259
14ef37b6
AH		 2260
2261static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2262 int plen,
2263 const struct net_device *dev,
2264 u32 flags, u32 noflags)
2265{
2266 struct fib6_node *fn;
2267 struct rt6_info *rt = NULL;
2268 struct fib6_table *table;
ca254490 2269 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2270
ca254490 2271 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2272 if (!table)
14ef37b6
AH		 2273 return NULL;
2274
5744dd9b 2275 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2276 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2277 if (!fn)
2278 goto out;
1f56a01f
MKL		 2279
2280 noflags |= RTF_CACHE;
14ef37b6 2281 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2282 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2283 continue;
2284 if ((rt->rt6i_flags & flags) != flags)
2285 continue;
85da53bf 2286 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2287 continue;
2288 dst_hold(&rt->dst);
2289 break;
2290 }
2291out:
5744dd9b 2292 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2293 return rt;
2294}
2295
2296
1da177e4
LT		 2297/* Create "default" multicast route to the interface */
2298
2299static void addrconf_add_mroute(struct net_device *dev)
2300{
86872cb5 2301 struct fib6_config cfg = {
ca254490 2302 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2303 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2304 .fc_ifindex = dev->ifindex,
2305 .fc_dst_len = 8,
2306 .fc_flags = RTF_UP,
c346dca1 2307 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2308 };
2309
2310 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2311
2312 ip6_route_add(&cfg);
1da177e4
LT		 2313}
2314
1da177e4
LT		 2315static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2316{
2317 struct inet6_dev *idev;
2318
2319 ASSERT_RTNL();
2320
e21e8467
SH		 2321 idev = ipv6_find_idev(dev);
2322 if (!idev)
64e724f6
BH		 2323 return ERR_PTR(-ENOBUFS);
2324
2325 if (idev->cnf.disable_ipv6)
2326 return ERR_PTR(-EACCES);
1da177e4
LT		 2327
2328 /* Add default multicast route */
ba46ee4c 2329 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
4af04aba 2330 addrconf_add_mroute(dev);
1da177e4 2331
1da177e4
LT		 2332 return idev;
2333}
2334
53bd6749
JP		 2335static void manage_tempaddrs(struct inet6_dev *idev,
2336 struct inet6_ifaddr *ifp,
2337 __u32 valid_lft, __u32 prefered_lft,
2338 bool create, unsigned long now)
2339{
2340 u32 flags;
2341 struct inet6_ifaddr *ift;
2342
2343 read_lock_bh(&idev->lock);
2344 /* update all temporary addresses in the list */
2345 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2346 int age, max_valid, max_prefered;
2347
2348 if (ifp != ift->ifpub)
2349 continue;
2350
2351 /* RFC 4941 section 3.3:
2352 * If a received option will extend the lifetime of a public
2353 * address, the lifetimes of temporary addresses should
2354 * be extended, subject to the overall constraint that no
2355 * temporary addresses should ever remain "valid" or "preferred"
2356 * for a time longer than (TEMP_VALID_LIFETIME) or
2357 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2358 */
2359 age = (now - ift->cstamp) / HZ;
2360 max_valid = idev->cnf.temp_valid_lft - age;
2361 if (max_valid < 0)
2362 max_valid = 0;
2363
2364 max_prefered = idev->cnf.temp_prefered_lft -
76506a98 2365 idev->desync_factor - age;
53bd6749
JP		 2366 if (max_prefered < 0)
2367 max_prefered = 0;
2368
2369 if (valid_lft > max_valid)
2370 valid_lft = max_valid;
2371
2372 if (prefered_lft > max_prefered)
2373 prefered_lft = max_prefered;
2374
2375 spin_lock(&ift->lock);
2376 flags = ift->flags;
2377 ift->valid_lft = valid_lft;
2378 ift->prefered_lft = prefered_lft;
2379 ift->tstamp = now;
2380 if (prefered_lft > 0)
2381 ift->flags &= ~IFA_F_DEPRECATED;
2382
2383 spin_unlock(&ift->lock);
2384 if (!(flags&IFA_F_TENTATIVE))
2385 ipv6_ifa_notify(0, ift);
2386 }
2387
2388 if ((create || list_empty(&idev->tempaddr_list)) &&
2389 idev->cnf.use_tempaddr > 0) {
2390 /* When a new public address is created as described
2391 * in [ADDRCONF], also create a new temporary address.
2392 * Also create a temporary address if it's enabled but
2393 * no temporary address currently exists.
2394 */
2395 read_unlock_bh(&idev->lock);
2396 ipv6_create_tempaddr(ifp, NULL);
2397 } else {
2398 read_unlock_bh(&idev->lock);
2399 }
2400}
2401
cc9da6cc
BM		 2402static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2403{
d35a00b8
FJ		 2404 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2405 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc
BM		 2406}
2407
cc84b3c6
AA		 2408int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2409 const struct prefix_info *pinfo,
2410 struct inet6_dev *in6_dev,
2411 const struct in6_addr *addr, int addr_type,
2412 u32 addr_flags, bool sllao, bool tokenized,
2413 __u32 valid_lft, u32 prefered_lft)
4f672235
AA		 2414{
2415 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2416 int create = 0, update_lft = 0;
2417
2418 if (!ifp && valid_lft) {
2419 int max_addresses = in6_dev->cnf.max_addresses;
2420
2421#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2422 if (in6_dev->cnf.optimistic_dad &&
2423 !net->ipv6.devconf_all->forwarding && sllao)
2424 addr_flags |= IFA_F_OPTIMISTIC;
2425#endif
2426
2427 /* Do not allow to create too much of autoconfigured
2428 * addresses; this would be too easy way to crash kernel.
2429 */
2430 if (!max_addresses ||
2431 ipv6_count_addresses(in6_dev) < max_addresses)
2432 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2433 pinfo->prefix_len,
2434 addr_type&IPV6_ADDR_SCOPE_MASK,
2435 addr_flags, valid_lft,
2436 prefered_lft);
2437
2438 if (IS_ERR_OR_NULL(ifp))
2439 return -1;
2440
2441 update_lft = 0;
2442 create = 1;
2443 spin_lock_bh(&ifp->lock);
2444 ifp->flags |= IFA_F_MANAGETEMPADDR;
2445 ifp->cstamp = jiffies;
2446 ifp->tokenized = tokenized;
2447 spin_unlock_bh(&ifp->lock);
2448 addrconf_dad_start(ifp);
2449 }
2450
2451 if (ifp) {
2452 u32 flags;
2453 unsigned long now;
2454 u32 stored_lft;
2455
2456 /* update lifetime (RFC2462 5.5.3 e) */
2457 spin_lock_bh(&ifp->lock);
2458 now = jiffies;
2459 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2460 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2461 else
2462 stored_lft = 0;
2463 if (!update_lft && !create && stored_lft) {
2464 const u32 minimum_lft = min_t(u32,
2465 stored_lft, MIN_VALID_LIFETIME);
2466 valid_lft = max(valid_lft, minimum_lft);
2467
2468 /* RFC4862 Section 5.5.3e:
2469 * "Note that the preferred lifetime of the
2470 * corresponding address is always reset to
2471 * the Preferred Lifetime in the received
2472 * Prefix Information option, regardless of
2473 * whether the valid lifetime is also reset or
2474 * ignored."
2475 *
2476 * So we should always update prefered_lft here.
2477 */
2478 update_lft = 1;
2479 }
2480
2481 if (update_lft) {
2482 ifp->valid_lft = valid_lft;
2483 ifp->prefered_lft = prefered_lft;
2484 ifp->tstamp = now;
2485 flags = ifp->flags;
2486 ifp->flags &= ~IFA_F_DEPRECATED;
2487 spin_unlock_bh(&ifp->lock);
2488
2489 if (!(flags&IFA_F_TENTATIVE))
2490 ipv6_ifa_notify(0, ifp);
2491 } else
2492 spin_unlock_bh(&ifp->lock);
2493
2494 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2495 create, now);
2496
2497 in6_ifa_put(ifp);
2498 addrconf_verify();
2499 }
2500
2501 return 0;
2502}
cc84b3c6 2503EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
4f672235 2504
e6bff995 2505void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2506{
2507 struct prefix_info *pinfo;
2508 __u32 valid_lft;
2509 __u32 prefered_lft;
4f672235 2510 int addr_type, err;
64236f3f 2511 u32 addr_flags = 0;
1da177e4 2512 struct inet6_dev *in6_dev;
56d417b1 2513 struct net *net = dev_net(dev);
1da177e4
LT		 2514
2515 pinfo = (struct prefix_info *) opt;
1ab1457c 2516
1da177e4 2517 if (len < sizeof(struct prefix_info)) {
ba3542e1 2518 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2519 return;
2520 }
1ab1457c 2521
1da177e4
LT		 2522 /*
2523 * Validation checks ([ADDRCONF], page 19)
2524 */
2525
2526 addr_type = ipv6_addr_type(&pinfo->prefix);
2527
2528 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2529 return;
2530
2531 valid_lft = ntohl(pinfo->valid);
2532 prefered_lft = ntohl(pinfo->prefered);
2533
2534 if (prefered_lft > valid_lft) {
e87cc472 2535 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2536 return;
2537 }
2538
2539 in6_dev = in6_dev_get(dev);
2540
63159f29 2541 if (!in6_dev) {
e87cc472
JP		 2542 net_dbg_ratelimited("addrconf: device %s not configured\n",
2543 dev->name);
1da177e4
LT		 2544 return;
2545 }
2546
2547 /*
2548 * Two things going on here:
2549 * 1) Add routes for on-link prefixes
2550 * 2) Configure prefixes with the auto flag set
2551 */
2552
4bed72e4
YH		 2553 if (pinfo->onlink) {
2554 struct rt6_info *rt;
2555 unsigned long rt_expires;
2556
6f704992
YH		 2557 /* Avoid arithmetic overflow. Really, we could
2558 * save rt_expires in seconds, likely valid_lft,
2559 * but it would require division in fib gc, that it
2560 * not good.
2561 */
4bed72e4
YH		 2562 if (HZ > USER_HZ)
2563 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2564 else
2565 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2566
4bed72e4
YH		 2567 if (addrconf_finite_timeout(rt_expires))
2568 rt_expires *= HZ;
1da177e4 2569
14ef37b6
AH		 2570 rt = addrconf_get_prefix_route(&pinfo->prefix,
2571 pinfo->prefix_len,
2572 dev,
2573 RTF_ADDRCONF | RTF_PREFIX_RT,
2574 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2575
14ef37b6 2576 if (rt) {
6f704992
YH		 2577 /* Autoconf prefix route */
2578 if (valid_lft == 0) {
2579 ip6_del_rt(rt);
2580 rt = NULL;
4bed72e4 2581 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2582 /* not infinity */
1716a961 2583 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2584 } else {
1716a961 2585 rt6_clean_expires(rt);
1da177e4
LT		 2586 }
2587 } else if (valid_lft) {
6f704992 2588 clock_t expires = 0;
4bed72e4
YH		 2589 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2590 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2591 /* not infinity */
2592 flags |= RTF_EXPIRES;
2593 expires = jiffies_to_clock_t(rt_expires);
2594 }
1da177e4 2595 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2596 dev, expires, flags);
1da177e4 2597 }
94e187c0 2598 ip6_rt_put(rt);
1da177e4
LT		 2599 }
2600
2601 /* Try to figure out our local address for this prefix */
2602
2603 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1da177e4 2604 struct in6_addr addr;
f997c55c 2605 bool tokenized = false, dev_addr_generated = false;
1da177e4
LT		 2606
2607 if (pinfo->prefix_len == 64) {
2608 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2609
2610 if (!ipv6_addr_any(&in6_dev->token)) {
2611 read_lock_bh(&in6_dev->lock);
2612 memcpy(addr.s6_addr + 8,
2613 in6_dev->token.s6_addr + 8, 8);
2614 read_unlock_bh(&in6_dev->lock);
617fe29d 2615 tokenized = true;
cc9da6cc 2616 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2617 !ipv6_generate_stable_address(&addr, 0,
2618 in6_dev)) {
64236f3f 2619 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2620 goto ok;
f53adae4
DB		 2621 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2622 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
4f672235 2623 goto put;
f997c55c
AA		 2624 } else {
2625 dev_addr_generated = true;
1da177e4
LT		 2626 }
2627 goto ok;
2628 }
e87cc472
JP		 2629 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2630 pinfo->prefix_len);
4f672235 2631 goto put;
1da177e4
LT		 2632
2633ok:
4f672235
AA		 2634 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2635 &addr, addr_type,
2636 addr_flags, sllao,
2637 tokenized, valid_lft,
2638 prefered_lft);
2639 if (err)
2640 goto put;
f997c55c
AA		 2641
2642 /* Ignore error case here because previous prefix add addr was
2643 * successful which will be notified.
2644 */
2645 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2646 addr_type, addr_flags, sllao,
2647 tokenized, valid_lft,
2648 prefered_lft,
2649 dev_addr_generated);
1da177e4
LT		 2650 }
2651 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
4f672235 2652put:
1da177e4
LT		 2653 in6_dev_put(in6_dev);
2654}
2655
2656/*
2657 * Set destination address.
2658 * Special case for SIT interfaces where we create a new "virtual"
2659 * device.
2660 */
af284937 2661int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2662{
2663 struct in6_ifreq ireq;
2664 struct net_device *dev;
2665 int err = -EINVAL;
2666
2667 rtnl_lock();
2668
2669 err = -EFAULT;
2670 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2671 goto err_exit;
2672
af284937 2673 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2674
2675 err = -ENODEV;
63159f29 2676 if (!dev)
1da177e4
LT		 2677 goto err_exit;
2678
07a93626 2679#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2680 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2681 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2682 struct ifreq ifr;
1da177e4
LT		 2683 struct ip_tunnel_parm p;
2684
2685 err = -EADDRNOTAVAIL;
2686 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2687 goto err_exit;
2688
2689 memset(&p, 0, sizeof(p));
2690 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2691 p.iph.saddr = 0;
2692 p.iph.version = 4;
2693 p.iph.ihl = 5;
2694 p.iph.protocol = IPPROTO_IPV6;
2695 p.iph.ttl = 64;
d20b3109 2696 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2697
5bc3eb7e
SH		 2698 if (ops->ndo_do_ioctl) {
2699 mm_segment_t oldfs = get_fs();
2700
2701 set_fs(KERNEL_DS);
2702 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2703 set_fs(oldfs);
2704 } else
2705 err = -EOPNOTSUPP;
1da177e4
LT		 2706
2707 if (err == 0) {
2708 err = -ENOBUFS;
af284937
DL		 2709 dev = __dev_get_by_name(net, p.name);
2710 if (!dev)
1da177e4
LT		 2711 goto err_exit;
2712 err = dev_open(dev);
2713 }
2714 }
0be669bb 2715#endif
1da177e4
LT		 2716
2717err_exit:
2718 rtnl_unlock();
2719 return err;
2720}
2721
93a714d6
MC		 2722static int ipv6_mc_config(struct sock *sk, bool join,
2723 const struct in6_addr *addr, int ifindex)
2724{
2725 int ret;
2726
2727 ASSERT_RTNL();
2728
2729 lock_sock(sk);
2730 if (join)
54ff9ef3 2731 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2732 else
54ff9ef3 2733 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2734 release_sock(sk);
2735
2736 return ret;
2737}
2738
1da177e4
LT		 2739/*
2740 * Manual configuration of address on an interface
2741 */
479840ff
JP		 2742static int inet6_addr_add(struct net *net, int ifindex,
2743 const struct in6_addr *pfx,
caeaba79 2744 const struct in6_addr *peer_pfx,
479840ff
JP		 2745 unsigned int plen, __u32 ifa_flags,
2746 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2747{
2748 struct inet6_ifaddr *ifp;
2749 struct inet6_dev *idev;
2750 struct net_device *dev;
93a714d6
MC		 2751 unsigned long timeout;
2752 clock_t expires;
1da177e4 2753 int scope;
6f704992 2754 u32 flags;
1da177e4
LT		 2755
2756 ASSERT_RTNL();
1ab1457c 2757
24ef0da7
TG		 2758 if (plen > 128)
2759 return -EINVAL;
2760
0778769d
NT		 2761 /* check the lifetime */
2762 if (!valid_lft || prefered_lft > valid_lft)
2763 return -EINVAL;
2764
53bd6749
JP		 2765 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2766 return -EINVAL;
2767
af284937
DL		 2768 dev = __dev_get_by_index(net, ifindex);
2769 if (!dev)
1da177e4 2770 return -ENODEV;
1ab1457c 2771
64e724f6
BH		 2772 idev = addrconf_add_dev(dev);
2773 if (IS_ERR(idev))
2774 return PTR_ERR(idev);
1da177e4 2775
93a714d6
MC		 2776 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2777 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2778 true, pfx, ifindex);
2779
2780 if (ret < 0)
2781 return ret;
2782 }
2783
1da177e4
LT		 2784 scope = ipv6_addr_scope(pfx);
2785
4bed72e4
YH		 2786 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2787 if (addrconf_finite_timeout(timeout)) {
2788 expires = jiffies_to_clock_t(timeout * HZ);
2789 valid_lft = timeout;
6f704992 2790 flags = RTF_EXPIRES;
4bed72e4
YH		 2791 } else {
2792 expires = 0;
2793 flags = 0;
2794 ifa_flags |= IFA_F_PERMANENT;
6f704992 2795 }
0778769d 2796
4bed72e4
YH		 2797 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2798 if (addrconf_finite_timeout(timeout)) {
2799 if (timeout == 0)
2800 ifa_flags |= IFA_F_DEPRECATED;
2801 prefered_lft = timeout;
2802 }
0778769d 2803
8a226b2c
JB		 2804 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2805 valid_lft, prefered_lft);
0778769d 2806
1da177e4 2807 if (!IS_ERR(ifp)) {
761aac73
TH		 2808 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2809 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2810 expires, flags);
2811 }
2812
95c385b4
NH		 2813 /*
2814 * Note that section 3.1 of RFC 4429 indicates
2815 * that the Optimistic flag should not be set for
2816 * manually configured addresses
2817 */
cf22f9a2 2818 addrconf_dad_start(ifp);
53bd6749
JP		 2819 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2820 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2821 true, jiffies);
1da177e4 2822 in6_ifa_put(ifp);
c15b1cca 2823 addrconf_verify_rtnl();
1da177e4 2824 return 0;
93a714d6
MC		 2825 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2826 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2827 false, pfx, ifindex);
1da177e4
LT		 2828 }
2829
2830 return PTR_ERR(ifp);
2831}
2832
6046d5b4
HK		 2833static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2834 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2835{
2836 struct inet6_ifaddr *ifp;
2837 struct inet6_dev *idev;
2838 struct net_device *dev;
1ab1457c 2839
24ef0da7
TG		 2840 if (plen > 128)
2841 return -EINVAL;
2842
af284937
DL		 2843 dev = __dev_get_by_index(net, ifindex);
2844 if (!dev)
1da177e4
LT		 2845 return -ENODEV;
2846
e5d08d71 2847 idev = __in6_dev_get(dev);
63159f29 2848 if (!idev)
1da177e4
LT		 2849 return -ENXIO;
2850
2851 read_lock_bh(&idev->lock);
502a2ffd 2852 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2853 if (ifp->prefix_len == plen &&
2854 ipv6_addr_equal(pfx, &ifp->addr)) {
2855 in6_ifa_hold(ifp);
2856 read_unlock_bh(&idev->lock);
1ab1457c 2857
6046d5b4
HK		 2858 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2859 (ifa_flags & IFA_F_MANAGETEMPADDR))
2860 manage_tempaddrs(idev, ifp, 0, 0, false,
2861 jiffies);
1da177e4 2862 ipv6_del_addr(ifp);
6046d5b4 2863 addrconf_verify_rtnl();
93a714d6
MC		 2864 if (ipv6_addr_is_multicast(pfx)) {
2865 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2866 false, pfx, dev->ifindex);
2867 }
1da177e4
LT		 2868 return 0;
2869 }
2870 }
2871 read_unlock_bh(&idev->lock);
2872 return -EADDRNOTAVAIL;
2873}
2874
2875
af284937 2876int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2877{
2878 struct in6_ifreq ireq;
2879 int err;
1ab1457c 2880
af31f412 2881 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2882 return -EPERM;
1ab1457c 2883
1da177e4
LT		 2884 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2885 return -EFAULT;
2886
2887 rtnl_lock();
caeaba79 2888 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2889 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2890 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2891 rtnl_unlock();
2892 return err;
2893}
2894
af284937 2895int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2896{
2897 struct in6_ifreq ireq;
2898 int err;
1ab1457c 2899
af31f412 2900 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2901 return -EPERM;
2902
2903 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2904 return -EFAULT;
2905
2906 rtnl_lock();
6046d5b4 2907 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2908 ireq.ifr6_prefixlen);
1da177e4
LT		 2909 rtnl_unlock();
2910 return err;
2911}
2912
b5f348e5
IJ		 2913static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2914 int plen, int scope)
2915{
2916 struct inet6_ifaddr *ifp;
2917
8a226b2c 2918 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2919 scope, IFA_F_PERMANENT,
2920 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2921 if (!IS_ERR(ifp)) {
2922 spin_lock_bh(&ifp->lock);
2923 ifp->flags &= ~IFA_F_TENTATIVE;
2924 spin_unlock_bh(&ifp->lock);
764d3be6 2925 rt_genid_bump_ipv6(dev_net(idev->dev));
b5f348e5
IJ		 2926 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2927 in6_ifa_put(ifp);
2928 }
2929}
2930
07a93626 2931#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2932static void sit_add_v4_addrs(struct inet6_dev *idev)
2933{
1da177e4
LT		 2934 struct in6_addr addr;
2935 struct net_device *dev;
c346dca1 2936 struct net *net = dev_net(idev->dev);
929c9cf3 2937 int scope, plen;
f0e2acfa 2938 u32 pflags = 0;
1da177e4
LT		 2939
2940 ASSERT_RTNL();
2941
2942 memset(&addr, 0, sizeof(struct in6_addr));
2943 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2944
2945 if (idev->dev->flags&IFF_POINTOPOINT) {
2946 addr.s6_addr32[0] = htonl(0xfe800000);
2947 scope = IFA_LINK;
929c9cf3 2948 plen = 64;
1da177e4
LT		 2949 } else {
2950 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2951 plen = 96;
f0e2acfa 2952 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2953 }
2954
2955 if (addr.s6_addr32[3]) {
929c9cf3 2956 add_addr(idev, &addr, plen, scope);
f0e2acfa 2957 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2958 return;
2959 }
2960
6fda7350 2961 for_each_netdev(net, dev) {
8e5e8f30 2962 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2963 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2964 struct in_ifaddr *ifa;
1da177e4
LT		 2965
2966 int flag = scope;
2967
2968 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2969
2970 addr.s6_addr32[3] = ifa->ifa_local;
2971
2972 if (ifa->ifa_scope == RT_SCOPE_LINK)
2973 continue;
2974 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2975 if (idev->dev->flags&IFF_POINTOPOINT)
2976 continue;
2977 flag |= IFA_HOST;
2978 }
1da177e4 2979
b5f348e5 2980 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 2981 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2982 pflags);
1da177e4
LT		 2983 }
2984 }
1ab1457c 2985 }
1da177e4 2986}
0be669bb 2987#endif
1da177e4
LT		 2988
2989static void init_loopback(struct net_device *dev)
2990{
2991 struct inet6_dev *idev;
25fb6ca4
BK		 2992 struct net_device *sp_dev;
2993 struct inet6_ifaddr *sp_ifa;
2994 struct rt6_info *sp_rt;
1da177e4
LT		 2995
2996 /* ::1 */
2997
2998 ASSERT_RTNL();
2999
e5d08d71 3000 idev = ipv6_find_idev(dev);
63159f29 3001 if (!idev) {
91df42be 3002 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3003 return;
3004 }
3005
b5f348e5 3006 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 3007
3008 /* Add routes to other interface's IPv6 addresses */
3009 for_each_netdev(dev_net(dev), sp_dev) {
3010 if (!strcmp(sp_dev->name, dev->name))
3011 continue;
3012
3013 idev = __in6_dev_get(sp_dev);
3014 if (!idev)
3015 continue;
3016
3017 read_lock_bh(&idev->lock);
3018 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
3019
3020 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
3021 continue;
3022
33d99113
G		 3023 if (sp_ifa->rt) {
3024 /* This dst has been added to garbage list when
3025 * lo device down, release this obsolete dst and
3026 * reallocate a new router for ifa.
3027 */
a220445f 3028 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
33d99113
G		 3029 ip6_rt_put(sp_ifa->rt);
3030 sp_ifa->rt = NULL;
3031 } else {
3032 continue;
3033 }
3034 }
a881ae1f 3035
57ec0afe 3036 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 3037
3038 /* Failure cases are ignored */
534c8779
G		 3039 if (!IS_ERR(sp_rt)) {
3040 sp_ifa->rt = sp_rt;
25fb6ca4 3041 ip6_ins_rt(sp_rt);
534c8779 3042 }
25fb6ca4
BK		 3043 }
3044 read_unlock_bh(&idev->lock);
3045 }
1da177e4
LT		 3046}
3047
2ad3ed59
AA		 3048void addrconf_add_linklocal(struct inet6_dev *idev,
3049 const struct in6_addr *addr, u32 flags)
1da177e4 3050{
8e5e8f30 3051 struct inet6_ifaddr *ifp;
64236f3f 3052 u32 addr_flags = flags | IFA_F_PERMANENT;
95c385b4
NH		 3053
3054#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3055 if (idev->cnf.optimistic_dad &&
702beb87 3056 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 3057 addr_flags |= IFA_F_OPTIMISTIC;
3058#endif
1da177e4 3059
07edd741
HFS		 3060 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3061 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 3062 if (!IS_ERR(ifp)) {
46d48046 3063 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 3064 addrconf_dad_start(ifp);
1da177e4
LT		 3065 in6_ifa_put(ifp);
3066 }
3067}
2ad3ed59 3068EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
1da177e4 3069
622c81d5
HFS		 3070static bool ipv6_reserved_interfaceid(struct in6_addr address)
3071{
3072 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3073 return true;
3074
3075 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3076 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3077 return true;
3078
3079 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3080 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3081 return true;
3082
3083 return false;
3084}
3085
3086static int ipv6_generate_stable_address(struct in6_addr *address,
3087 u8 dad_count,
3088 const struct inet6_dev *idev)
3089{
622c81d5
HFS		 3090 static DEFINE_SPINLOCK(lock);
3091 static __u32 digest[SHA_DIGEST_WORDS];
3092 static __u32 workspace[SHA_WORKSPACE_WORDS];
3093
3094 static union {
3095 char __data[SHA_MESSAGE_BYTES];
3096 struct {
3097 struct in6_addr secret;
ff40217e 3098 __be32 prefix[2];
622c81d5
HFS		 3099 unsigned char hwaddr[MAX_ADDR_LEN];
3100 u8 dad_count;
3101 } __packed;
3102 } data;
3103
3104 struct in6_addr secret;
3105 struct in6_addr temp;
3106 struct net *net = dev_net(idev->dev);
3107
3108 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3109
3110 if (idev->cnf.stable_secret.initialized)
3111 secret = idev->cnf.stable_secret.secret;
3112 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3113 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3114 else
3115 return -1;
3116
3117retry:
3118 spin_lock_bh(&lock);
3119
3120 sha_init(digest);
3121 memset(&data, 0, sizeof(data));
3122 memset(workspace, 0, sizeof(workspace));
3123 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3124 data.prefix[0] = address->s6_addr32[0];
3125 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3126 data.secret = secret;
3127 data.dad_count = dad_count;
3128
3129 sha_transform(digest, data.__data, workspace);
3130
3131 temp = *address;
ff40217e
HFS		 3132 temp.s6_addr32[2] = (__force __be32)digest[0];
3133 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3134
3135 spin_unlock_bh(&lock);
3136
3137 if (ipv6_reserved_interfaceid(temp)) {
3138 dad_count++;
1855b7c3 3139 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3140 return -1;
3141 goto retry;
3142 }
3143
3144 *address = temp;
3145 return 0;
3146}
3147
cc9da6cc
BM		 3148static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3149{
3150 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3151
3152 if (s->initialized)
3153 return;
3154 s = &idev->cnf.stable_secret;
3155 get_random_bytes(&s->secret, sizeof(s->secret));
3156 s->initialized = true;
3157}
3158
bc91b0f0
JP		 3159static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3160{
622c81d5
HFS		 3161 struct in6_addr addr;
3162
ca254490
DA		 3163 /* no link local addresses on L3 master devices */
3164 if (netif_is_l3_master(idev->dev))
3165 return;
3166
622c81d5 3167 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3168
d35a00b8 3169 switch (idev->cnf.addr_gen_mode) {
cc9da6cc
BM		 3170 case IN6_ADDR_GEN_MODE_RANDOM:
3171 ipv6_gen_mode_random_init(idev);
3172 /* fallthrough */
3173 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3174 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3175 addrconf_add_linklocal(idev, &addr,
3176 IFA_F_STABLE_PRIVACY);
622c81d5
HFS		 3177 else if (prefix_route)
3178 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3179 break;
3180 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3181 /* addrconf_add_linklocal also adds a prefix_route and we
3182 * only need to care about prefix routes if ipv6_generate_eui64
3183 * couldn't generate one.
3184 */
3185 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3186 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0
JP		 3187 else if (prefix_route)
3188 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3189 break;
3190 case IN6_ADDR_GEN_MODE_NONE:
3191 default:
3192 /* will not add any link local address */
3193 break;
bc91b0f0
JP		 3194 }
3195}
3196
1da177e4
LT		 3197static void addrconf_dev_config(struct net_device *dev)
3198{
8e5e8f30 3199 struct inet6_dev *idev;
1da177e4
LT		 3200
3201 ASSERT_RTNL();
3202
74235a25
HX		 3203 if ((dev->type != ARPHRD_ETHER) &&
3204 (dev->type != ARPHRD_FDDI) &&
74235a25 3205 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3206 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3207 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3208 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc 3209 (dev->type != ARPHRD_6LOWPAN) &&
45ce0fd1
FJ		 3210 (dev->type != ARPHRD_IP6GRE) &&
3211 (dev->type != ARPHRD_IPGRE) &&
3212 (dev->type != ARPHRD_TUNNEL) &&
cc9da6cc 3213 (dev->type != ARPHRD_NONE)) {
74235a25
HX		 3214 /* Alas, we support only Ethernet autoconfiguration. */
3215 return;
3216 }
3217
1da177e4 3218 idev = addrconf_add_dev(dev);
64e724f6 3219 if (IS_ERR(idev))
1da177e4
LT		 3220 return;
3221
cc9da6cc
BM		 3222 /* this device type has no EUI support */
3223 if (dev->type == ARPHRD_NONE &&
d35a00b8
FJ		 3224 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3225 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc 3226
bc91b0f0 3227 addrconf_addr_gen(idev, false);
1da177e4
LT		 3228}
3229
07a93626 3230#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3231static void addrconf_sit_config(struct net_device *dev)
3232{
3233 struct inet6_dev *idev;
3234
3235 ASSERT_RTNL();
3236
1ab1457c
YH		 3237 /*
3238 * Configure the tunnel with one of our IPv4
3239 * addresses... we should configure all of
1da177e4
LT		 3240 * our v4 addrs in the tunnel
3241 */
3242
e5d08d71 3243 idev = ipv6_find_idev(dev);
63159f29 3244 if (!idev) {
91df42be 3245 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3246 return;
3247 }
3248
c7dc89c0 3249 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3250 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3251 return;
3252 }
3253
1da177e4
LT		 3254 sit_add_v4_addrs(idev);
3255
62b54dd9 3256 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3257 addrconf_add_mroute(dev);
1da177e4 3258}
0be669bb 3259#endif
1da177e4 3260
07a93626 3261#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3262static void addrconf_gre_config(struct net_device *dev)
3263{
3264 struct inet6_dev *idev;
aee80b54 3265
aee80b54 3266 ASSERT_RTNL();
3267
e5d08d71 3268 idev = ipv6_find_idev(dev);
63159f29 3269 if (!idev) {
91df42be 3270 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3271 return;
3272 }
3273
bc91b0f0 3274 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3275 if (dev->flags & IFF_POINTOPOINT)
3276 addrconf_add_mroute(dev);
aee80b54 3277}
3278#endif
3279
f1705ec1
DA		 3280static int fixup_permanent_addr(struct inet6_dev *idev,
3281 struct inet6_ifaddr *ifp)
3282{
3283 if (!ifp->rt) {
3284 struct rt6_info *rt;
3285
3286 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3287 if (unlikely(IS_ERR(rt)))
3288 return PTR_ERR(rt);
3289
3290 ifp->rt = rt;
3291 }
3292
3293 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3294 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3295 idev->dev, 0, 0);
3296 }
3297
3298 addrconf_dad_start(ifp);
3299
3300 return 0;
3301}
3302
3303static void addrconf_permanent_addr(struct net_device *dev)
3304{
3305 struct inet6_ifaddr *ifp, *tmp;
3306 struct inet6_dev *idev;
3307
3308 idev = __in6_dev_get(dev);
3309 if (!idev)
3310 return;
3311
3312 write_lock_bh(&idev->lock);
3313
3314 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3315 if ((ifp->flags & IFA_F_PERMANENT) &&
3316 fixup_permanent_addr(idev, ifp) < 0) {
3317 write_unlock_bh(&idev->lock);
3318 ipv6_del_addr(ifp);
3319 write_lock_bh(&idev->lock);
3320
3321 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3322 idev->dev->name, &ifp->addr);
3323 }
3324 }
3325
3326 write_unlock_bh(&idev->lock);
3327}
3328
1ab1457c 3329static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3330 void *ptr)
1da177e4 3331{
351638e7 3332 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4f7f34ea 3333 struct netdev_notifier_changeupper_info *info;
748e2d93 3334 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 3335 int run_pending = 0;
b217d616 3336 int err;
1da177e4 3337
e21e8467 3338 switch (event) {
45ba9dd2 3339 case NETDEV_REGISTER:
74235a25 3340 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3341 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3342 if (IS_ERR(idev))
3343 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3344 }
3345 break;
bcdd553f 3346
b7b0b1d2
AD		 3347 case NETDEV_CHANGEMTU:
3348 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3349 if (dev->mtu < IPV6_MIN_MTU) {
3350 addrconf_ifdown(dev, 1);
3351 break;
3352 }
3353
3354 if (idev) {
3355 rt6_mtu_change(dev, dev->mtu);
3356 idev->cnf.mtu6 = dev->mtu;
3357 break;
3358 }
3359
3360 /* allocate new idev */
3361 idev = ipv6_add_dev(dev);
3362 if (IS_ERR(idev))
3363 break;
3364
3365 /* device is still not ready */
3366 if (!(idev->if_flags & IF_READY))
3367 break;
3368
3369 run_pending = 1;
3370
3371 /* fall through */
3372
1da177e4 3373 case NETDEV_UP:
3c21edbd 3374 case NETDEV_CHANGE:
c2edacf8
JV		 3375 if (dev->flags & IFF_SLAVE)
3376 break;
3377
3ce62a84
WC		 3378 if (idev && idev->cnf.disable_ipv6)
3379 break;
3380
3c21edbd 3381 if (event == NETDEV_UP) {
38bd10c4
DA		 3382 /* restore routes for permanent addresses */
3383 addrconf_permanent_addr(dev);
3384
f24e3d65 3385 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 3386 /* device is not ready yet. */
f3213831 3387 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3388 dev->name);
3389 break;
3390 }
99081049 3391
d31c7b8f
EP		 3392 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3393 idev = ipv6_add_dev(dev);
3394
a317a2f1 3395 if (!IS_ERR_OR_NULL(idev)) {
99081049 3396 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3397 run_pending = 1;
3398 }
b7b0b1d2 3399 } else if (event == NETDEV_CHANGE) {
f24e3d65 3400 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 3401 /* device is still not ready. */
3402 break;
3403 }
3404
3405 if (idev) {
a088d1d7
LL		 3406 if (idev->if_flags & IF_READY) {
3407 /* device is already configured -
3408 * but resend MLD reports, we might
3409 * have roamed and need to update
3410 * multicast snooping switches
3411 */
3412 ipv6_mc_up(idev);
3c21edbd 3413 break;
a088d1d7 3414 }
3c21edbd
YH		 3415 idev->if_flags |= IF_READY;
3416 }
3417
f3213831
JP		 3418 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3419 dev->name);
3c21edbd 3420
c5e33bdd 3421 run_pending = 1;
3c21edbd
YH		 3422 }
3423
e21e8467 3424 switch (dev->type) {
07a93626 3425#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3426 case ARPHRD_SIT:
3427 addrconf_sit_config(dev);
3428 break;
aee80b54 3429#endif
07a93626 3430#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3431 case ARPHRD_IPGRE:
3432 addrconf_gre_config(dev);
3433 break;
0be669bb 3434#endif
1da177e4
LT		 3435 case ARPHRD_LOOPBACK:
3436 init_loopback(dev);
3437 break;
3438
3439 default:
3440 addrconf_dev_config(dev);
3441 break;
3ff50b79 3442 }
bcdd553f 3443
a317a2f1 3444 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3445 if (run_pending)
3446 addrconf_dad_run(idev);
3447
bcdd553f
SH		 3448 /*
3449 * If the MTU changed during the interface down,
3450 * when the interface up, the changed MTU must be
3451 * reflected in the idev as well as routers.
1da177e4 3452 */
bcdd553f
SH		 3453 if (idev->cnf.mtu6 != dev->mtu &&
3454 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3455 rt6_mtu_change(dev, dev->mtu);
3456 idev->cnf.mtu6 = dev->mtu;
3457 }
3458 idev->tstamp = jiffies;
3459 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3460
3461 /*
3462 * If the changed mtu during down is lower than
3463 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3464 */
3465 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 3466 addrconf_ifdown(dev, 1);
1da177e4
LT		 3467 }
3468 break;
3469
1da177e4
LT		 3470 case NETDEV_DOWN:
3471 case NETDEV_UNREGISTER:
3472 /*
3473 * Remove all addresses from this interface.
3474 */
3475 addrconf_ifdown(dev, event != NETDEV_DOWN);
3476 break;
3c21edbd 3477
1da177e4 3478 case NETDEV_CHANGENAME:
1da177e4 3479 if (idev) {
5632c515 3480 snmp6_unregister_dev(idev);
408c4768 3481 addrconf_sysctl_unregister(idev);
a317a2f1 3482 err = addrconf_sysctl_register(idev);
b217d616
HX		 3483 if (err)
3484 return notifier_from_errno(err);
a317a2f1
WC		 3485 err = snmp6_register_dev(idev);
3486 if (err) {
3487 addrconf_sysctl_unregister(idev);
3488 return notifier_from_errno(err);
3489 }
5632c515 3490 }
1da177e4 3491 break;
bcdd553f 3492
93d9b7d7
JP		 3493 case NETDEV_PRE_TYPE_CHANGE:
3494 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3495 if (idev)
3496 addrconf_type_change(dev, event);
75c78500 3497 break;
4f7f34ea
DA		 3498
3499 case NETDEV_CHANGEUPPER:
3500 info = ptr;
3501
3502 /* flush all routes if dev is linked to or unlinked from
3503 * an L3 master device (e.g., VRF)
3504 */
3505 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3506 addrconf_ifdown(dev, 0);
3ff50b79 3507 }
1da177e4
LT		 3508
3509 return NOTIFY_OK;
3510}
3511
3512/*
3513 * addrconf module should be notified of a device going up
3514 */
3515static struct notifier_block ipv6_dev_notf = {
3516 .notifier_call = addrconf_notify,
1da177e4
LT		 3517};
3518
93d9b7d7 3519static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3520{
3521 struct inet6_dev *idev;
3522 ASSERT_RTNL();
3523
3524 idev = __in6_dev_get(dev);
3525
93d9b7d7 3526 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3527 ipv6_mc_remap(idev);
93d9b7d7 3528 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3529 ipv6_mc_unmap(idev);
3530}
3531
70af921d
DA		 3532static bool addr_is_local(const struct in6_addr *addr)
3533{
3534 return ipv6_addr_type(addr) &
3535 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3536}
3537
1da177e4
LT		 3538static int addrconf_ifdown(struct net_device *dev, int how)
3539{
c346dca1 3540 struct net *net = dev_net(dev);
502a2ffd 3541 struct inet6_dev *idev;
f1705ec1
DA		 3542 struct inet6_ifaddr *ifa, *tmp;
3543 struct list_head del_list;
3544 int _keep_addr;
3545 bool keep_addr;
73a8bd74 3546 int state, i;
1da177e4
LT		 3547
3548 ASSERT_RTNL();
3549
73a8bd74
DM		 3550 rt6_ifdown(net, dev);
3551 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3552
3553 idev = __in6_dev_get(dev);
63159f29 3554 if (!idev)
1da177e4
LT		 3555 return -ENODEV;
3556
bcdd553f
SH		 3557 /*
3558 * Step 1: remove reference to ipv6 device from parent device.
3559 * Do not dev_put!
1da177e4 3560 */
439e2385 3561 if (how) {
1da177e4 3562 idev->dead = 1;
8814c4b5
YH		 3563
3564 /* protected by rtnl_lock */
a9b3cd7f 3565 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3566
3567 /* Step 1.5: remove snmp6 entry */
3568 snmp6_unregister_dev(idev);
3569
3570 }
3571
f1705ec1
DA		 3572 /* aggregate the system setting and interface setting */
3573 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3574 if (!_keep_addr)
3575 _keep_addr = idev->cnf.keep_addr_on_down;
3576
3577 /* combine the user config with event to determine if permanent
3578 * addresses are to be removed from address hash table
3579 */
bc561632 3580 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
f1705ec1 3581
73a8bd74
DM		 3582 /* Step 2: clear hash table */
3583 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3584 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3585
3586 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3587restart:
b67bfe0d 3588 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3589 if (ifa->idev == idev) {
c15b1cca 3590 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3591 /* combined flag + permanent flag decide if
3592 * address is retained on a down event
3593 */
3594 if (!keep_addr ||
70af921d
DA		 3595 !(ifa->flags & IFA_F_PERMANENT) ||
3596 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3597 hlist_del_init_rcu(&ifa->addr_lst);
3598 goto restart;
3599 }
73a8bd74
DM		 3600 }
3601 }
3602 spin_unlock_bh(&addrconf_hash_lock);
3603 }
3604
1da177e4
LT		 3605 write_lock_bh(&idev->lock);
3606
b7b1bfce
HFS		 3607 addrconf_del_rs_timer(idev);
3608
bcdd553f 3609 /* Step 2: clear flags for stateless addrconf */
439e2385 3610 if (!how)
3c21edbd 3611 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3612
bcdd553f 3613 /* Step 3: clear tempaddr list */
372e6c8f 3614 while (!list_empty(&idev->tempaddr_list)) {
3615 ifa = list_first_entry(&idev->tempaddr_list,
3616 struct inet6_ifaddr, tmp_list);
3617 list_del(&ifa->tmp_list);
1da177e4
LT		 3618 write_unlock_bh(&idev->lock);
3619 spin_lock_bh(&ifa->lock);
3620
3621 if (ifa->ifpub) {
3622 in6_ifa_put(ifa->ifpub);
3623 ifa->ifpub = NULL;
3624 }
3625 spin_unlock_bh(&ifa->lock);
3626 in6_ifa_put(ifa);
3627 write_lock_bh(&idev->lock);
3628 }
8f37ada5 3629
f1705ec1
DA		 3630 /* re-combine the user config with event to determine if permanent
3631 * addresses are to be removed from the interface list
3632 */
bc561632 3633 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
84e8b803 3634
f1705ec1
DA		 3635 INIT_LIST_HEAD(&del_list);
3636 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
38bd10c4
DA		 3637 struct rt6_info *rt = NULL;
3638
f1705ec1 3639 addrconf_del_dad_work(ifa);
84e8b803 3640
73a8bd74 3641 write_unlock_bh(&idev->lock);
8e8e676d 3642 spin_lock_bh(&ifa->lock);
f1705ec1 3643
70af921d
DA		 3644 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3645 !addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3646 /* set state to skip the notifier below */
3647 state = INET6_IFADDR_STATE_DEAD;
3648 ifa->state = 0;
3649 if (!(ifa->flags & IFA_F_NODAD))
3650 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3651
3652 rt = ifa->rt;
3653 ifa->rt = NULL;
f1705ec1
DA		 3654 } else {
3655 state = ifa->state;
3656 ifa->state = INET6_IFADDR_STATE_DEAD;
3657
c882219a 3658 list_move(&ifa->if_list, &del_list);
f1705ec1
DA		 3659 }
3660
8e8e676d 3661 spin_unlock_bh(&ifa->lock);
9d82ca98 3662
38bd10c4
DA		 3663 if (rt)
3664 ip6_del_rt(rt);
3665
73a8bd74
DM		 3666 if (state != INET6_IFADDR_STATE_DEAD) {
3667 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3668 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
ea06f717
MM		 3669 } else {
3670 if (idev->cnf.forwarding)
3671 addrconf_leave_anycast(ifa);
3672 addrconf_leave_solict(ifa->idev, &ifa->addr);
27bdb2ab 3673 }
8f37ada5 3674
73a8bd74
DM		 3675 write_lock_bh(&idev->lock);
3676 }
8f37ada5 3677
1da177e4
LT		 3678 write_unlock_bh(&idev->lock);
3679
f1705ec1
DA		 3680 /* now clean up addresses to be removed */
3681 while (!list_empty(&del_list)) {
3682 ifa = list_first_entry(&del_list,
3683 struct inet6_ifaddr, if_list);
3684 list_del(&ifa->if_list);
3685
3686 in6_ifa_put(ifa);
3687 }
3688
381f4dca
SD		 3689 /* Step 5: Discard anycast and multicast list */
3690 if (how) {
3691 ipv6_ac_destroy_dev(idev);
1da177e4 3692 ipv6_mc_destroy_dev(idev);
381f4dca 3693 } else {
1da177e4 3694 ipv6_mc_down(idev);
381f4dca 3695 }
1da177e4 3696
1da177e4 3697 idev->tstamp = jiffies;
1ab1457c 3698
bcdd553f 3699 /* Last: Shot the device (if unregistered) */
439e2385 3700 if (how) {
408c4768 3701 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3702 neigh_parms_release(&nd_tbl, idev->nd_parms);
3703 neigh_ifdown(&nd_tbl, dev);
3704 in6_dev_put(idev);
3705 }
3706 return 0;
3707}
3708
3709static void addrconf_rs_timer(unsigned long data)
3710{
b7b1bfce 3711 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3712 struct net_device *dev = idev->dev;
b7b1bfce 3713 struct in6_addr lladdr;
1da177e4 3714
b7b1bfce 3715 write_lock(&idev->lock);
5b2a1953 3716 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3717 goto out;
3718
9ba2add3 3719 if (!ipv6_accept_ra(idev))
5b2a1953 3720 goto out;
3721
3722 /* Announcement received after solicitation was sent */
3723 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3724 goto out;
1da177e4 3725
bd11f074 3726 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
caf92bc4
CW		 3727 write_unlock(&idev->lock);
3728 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3729 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3730 &in6addr_linklocal_allrouters);
3731 else
caf92bc4 3732 goto put;
1da177e4 3733
caf92bc4 3734 write_lock(&idev->lock);
bd11f074
MŻ		 3735 idev->rs_interval = rfc3315_s14_backoff_update(
3736 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
b7b1bfce
HFS		 3737 /* The wait after the last probe can be shorter */
3738 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3739 idev->cnf.rtr_solicits) ?
3740 idev->cnf.rtr_solicit_delay :
bd11f074 3741 idev->rs_interval);
1da177e4 3742 } else {
1da177e4
LT		 3743 /*
3744 * Note: we do not support deprecated "all on-link"
3745 * assumption any longer.
3746 */
91df42be 3747 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3748 }
3749
3750out:
b7b1bfce 3751 write_unlock(&idev->lock);
caf92bc4 3752put:
b7b1bfce 3753 in6_dev_put(idev);
1da177e4
LT		 3754}
3755
3756/*
3757 * Duplicate Address Detection
3758 */
3c21edbd
YH		 3759static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3760{
3761 unsigned long rand_num;
3762 struct inet6_dev *idev = ifp->idev;
adc176c5 3763 u64 nonce;
3c21edbd 3764
95c385b4
NH		 3765 if (ifp->flags & IFA_F_OPTIMISTIC)
3766 rand_num = 0;
3767 else
63862b5b 3768 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3769
adc176c5
EN		 3770 nonce = 0;
3771 if (idev->cnf.enhanced_dad ||
3772 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3773 do
3774 get_random_bytes(&nonce, 6);
3775 while (nonce == 0);
3776 }
3777 ifp->dad_nonce = nonce;
b7b1bfce 3778 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3779 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3780}
3781
c15b1cca 3782static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3783{
3784 struct inet6_dev *idev = ifp->idev;
3785 struct net_device *dev = idev->dev;
764d3be6 3786 bool bump_id, notify = false;
1da177e4
LT		 3787
3788 addrconf_join_solict(dev, &ifp->addr);
3789
63862b5b 3790 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3791
3792 read_lock_bh(&idev->lock);
622ccdf1 3793 spin_lock(&ifp->lock);
e9d3e084 3794 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3795 goto out;
1da177e4
LT		 3796
3797 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3798 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3799 !(ifp->flags&IFA_F_TENTATIVE) ||
3800 ifp->flags & IFA_F_NODAD) {
764d3be6 3801 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3802 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3803 spin_unlock(&ifp->lock);
1da177e4
LT		 3804 read_unlock_bh(&idev->lock);
3805
764d3be6 3806 addrconf_dad_completed(ifp, bump_id);
1da177e4
LT		 3807 return;
3808 }
3809
6732bade 3810 if (!(idev->if_flags & IF_READY)) {
21809faf 3811 spin_unlock(&ifp->lock);
6732bade 3812 read_unlock_bh(&idev->lock);
3c21edbd 3813 /*
590a9887 3814 * If the device is not ready:
3c21edbd
YH		 3815 * - keep it tentative if it is a permanent address.
3816 * - otherwise, kill it.
3817 */
3818 in6_ifa_hold(ifp);
cc411d0b 3819 addrconf_dad_stop(ifp, 0);
6732bade 3820 return;
3c21edbd 3821 }
95c385b4
NH		 3822
3823 /*
3824 * Optimistic nodes can start receiving
3825 * Frames right away
3826 */
7fd2561e 3827 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3828 ip6_ins_rt(ifp->rt);
7fd2561e
EK		 3829 if (ipv6_use_optimistic_addr(idev)) {
3830 /* Because optimistic nodes can use this address,
3831 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3832 */
16186a82 3833 notify = true;
7fd2561e
EK		 3834 }
3835 }
95c385b4 3836
6732bade 3837 addrconf_dad_kick(ifp);
1da177e4 3838out:
622ccdf1 3839 spin_unlock(&ifp->lock);
1da177e4 3840 read_unlock_bh(&idev->lock);
16186a82 3841 if (notify)
3842 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 3843}
3844
c15b1cca 3845static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3846{
c15b1cca
HFS		 3847 bool begin_dad = false;
3848
8e8e676d 3849 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3850 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3851 ifp->state = INET6_IFADDR_STATE_PREDAD;
3852 begin_dad = true;
3853 }
8e8e676d 3854 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3855
3856 if (begin_dad)
3857 addrconf_mod_dad_work(ifp, 0);
3858}
3859
3860static void addrconf_dad_work(struct work_struct *w)
3861{
3862 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3863 struct inet6_ifaddr,
3864 dad_work);
1da177e4 3865 struct inet6_dev *idev = ifp->idev;
764d3be6 3866 bool bump_id, disable_ipv6 = false;
1da177e4
LT		 3867 struct in6_addr mcaddr;
3868
c15b1cca
HFS		 3869 enum {
3870 DAD_PROCESS,
3871 DAD_BEGIN,
3872 DAD_ABORT,
3873 } action = DAD_PROCESS;
3874
3875 rtnl_lock();
3876
8e8e676d 3877 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3878 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3879 action = DAD_BEGIN;
3880 ifp->state = INET6_IFADDR_STATE_DAD;
3881 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3882 action = DAD_ABORT;
3883 ifp->state = INET6_IFADDR_STATE_POSTDAD;
85b51b12
MM		 3884
3885 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3886 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3887 struct in6_addr addr;
3888
3889 addr.s6_addr32[0] = htonl(0xfe800000);
3890 addr.s6_addr32[1] = 0;
3891
3892 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3893 ipv6_addr_equal(&ifp->addr, &addr)) {
3894 /* DAD failed for link-local based on MAC */
3895 idev->cnf.disable_ipv6 = 1;
3896
3897 pr_info("%s: IPv6 being disabled!\n",
3898 ifp->idev->dev->name);
3899 disable_ipv6 = true;
3900 }
3901 }
c15b1cca 3902 }
8e8e676d 3903 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3904
3905 if (action == DAD_BEGIN) {
3906 addrconf_dad_begin(ifp);
3907 goto out;
3908 } else if (action == DAD_ABORT) {
751eb6b6 3909 in6_ifa_hold(ifp);
c15b1cca 3910 addrconf_dad_stop(ifp, 1);
85b51b12
MM		 3911 if (disable_ipv6)
3912 addrconf_ifdown(idev->dev, 0);
c15b1cca
HFS		 3913 goto out;
3914 }
3915
b7b1bfce 3916 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3917 goto out;
3918
c15b1cca 3919 write_lock_bh(&idev->lock);
122e4519 3920 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3921 write_unlock_bh(&idev->lock);
1da177e4
LT		 3922 goto out;
3923 }
21809faf 3924
3925 spin_lock(&ifp->lock);
622ccdf1
HX		 3926 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3927 spin_unlock(&ifp->lock);
c15b1cca 3928 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3929 goto out;
3930 }
3931
b7b1bfce 3932 if (ifp->dad_probes == 0) {
1da177e4
LT		 3933 /*
3934 * DAD was successful
3935 */
3936
764d3be6 3937 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3938 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3939 spin_unlock(&ifp->lock);
c15b1cca 3940 write_unlock_bh(&idev->lock);
1da177e4 3941
764d3be6 3942 addrconf_dad_completed(ifp, bump_id);
1da177e4
LT		 3943
3944 goto out;
3945 }
3946
b7b1bfce 3947 ifp->dad_probes--;
c15b1cca
HFS		 3948 addrconf_mod_dad_work(ifp,
3949 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3950 spin_unlock(&ifp->lock);
c15b1cca 3951 write_unlock_bh(&idev->lock);
1da177e4
LT		 3952
3953 /* send a neighbour solicitation for our addr */
1da177e4 3954 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
adc176c5
EN		 3955 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
3956 ifp->dad_nonce);
1da177e4
LT		 3957out:
3958 in6_ifa_put(ifp);
c15b1cca 3959 rtnl_unlock();
1da177e4
LT		 3960}
3961
11ffff75
HFS		 3962/* ifp->idev must be at least read locked */
3963static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3964{
3965 struct inet6_ifaddr *ifpiter;
3966 struct inet6_dev *idev = ifp->idev;
3967
602582ca
HFS		 3968 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3969 if (ifpiter->scope > IFA_LINK)
3970 break;
11ffff75
HFS		 3971 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3972 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3973 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3974 IFA_F_PERMANENT)
3975 return false;
3976 }
3977 return true;
3978}
3979
764d3be6 3980static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id)
1da177e4 3981{
e21e8467 3982 struct net_device *dev = ifp->idev->dev;
b7b1bfce 3983 struct in6_addr lladdr;
b173ee48 3984 bool send_rs, send_mld;
b7b1bfce 3985
c15b1cca 3986 addrconf_del_dad_work(ifp);
1da177e4
LT		 3987
3988 /*
3989 * Configure the address for reception. Now it is valid.
3990 */
3991
3992 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3993
026359bc
TA		 3994 /* If added prefix is link local and we are prepared to process
3995 router advertisements, start sending router solicitations.
1da177e4
LT		 3996 */
3997
1ec047eb 3998 read_lock_bh(&ifp->idev->lock);
11ffff75 3999 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 4000 send_rs = send_mld &&
4001 ipv6_accept_ra(ifp->idev) &&
bd11f074 4002 ifp->idev->cnf.rtr_solicits != 0 &&
b173ee48 4003 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 4004 read_unlock_bh(&ifp->idev->lock);
4005
b173ee48
HFS		 4006 /* While dad is in progress mld report's source address is in6_addrany.
4007 * Resend with proper ll now.
4008 */
4009 if (send_mld)
4010 ipv6_mc_dad_complete(ifp->idev);
4011
1ec047eb 4012 if (send_rs) {
1da177e4
LT		 4013 /*
4014 * If a host as already performed a random delay
4015 * [...] as part of DAD [...] there is no need
4016 * to delay again before sending the first RS
4017 */
1ec047eb 4018 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 4019 return;
1ec047eb 4020 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 4021
b7b1bfce
HFS		 4022 write_lock_bh(&ifp->idev->lock);
4023 spin_lock(&ifp->lock);
bd11f074
MŻ		 4024 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4025 ifp->idev->cnf.rtr_solicit_interval);
b7b1bfce 4026 ifp->idev->rs_probes = 1;
1da177e4 4027 ifp->idev->if_flags |= IF_RS_SENT;
bd11f074 4028 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
b7b1bfce
HFS		 4029 spin_unlock(&ifp->lock);
4030 write_unlock_bh(&ifp->idev->lock);
1da177e4 4031 }
764d3be6
PA		 4032
4033 if (bump_id)
4034 rt_genid_bump_ipv6(dev_net(dev));
a11a7f71
MH		 4035
4036 /* Make sure that a new temporary address will be created
4037 * before this temporary address becomes deprecated.
4038 */
4039 if (ifp->flags & IFA_F_TEMPORARY)
4040 addrconf_verify_rtnl();
1da177e4
LT		 4041}
4042
e21e8467
SH		 4043static void addrconf_dad_run(struct inet6_dev *idev)
4044{
c5e33bdd
YH		 4045 struct inet6_ifaddr *ifp;
4046
4047 read_lock_bh(&idev->lock);
502a2ffd 4048 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 4049 spin_lock(&ifp->lock);
f2344a13
HX		 4050 if (ifp->flags & IFA_F_TENTATIVE &&
4051 ifp->state == INET6_IFADDR_STATE_DAD)
4052 addrconf_dad_kick(ifp);
21809faf 4053 spin_unlock(&ifp->lock);
c5e33bdd
YH		 4054 }
4055 read_unlock_bh(&idev->lock);
4056}
4057
1da177e4
LT		 4058#ifdef CONFIG_PROC_FS
4059struct if6_iter_state {
3c40090a 4060 struct seq_net_private p;
1da177e4 4061 int bucket;
1d578303 4062 int offset;
1da177e4
LT		 4063};
4064
1d578303 4065static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 4066{
4067 struct inet6_ifaddr *ifa = NULL;
4068 struct if6_iter_state *state = seq->private;
1218854a 4069 struct net *net = seq_file_net(seq);
1d578303 4070 int p = 0;
1da177e4 4071
1d578303
MM		 4072 /* initial bucket if pos is 0 */
4073 if (pos == 0) {
4074 state->bucket = 0;
4075 state->offset = 0;
4076 }
4077
4078 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 4079 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 4080 addr_lst) {
9f0d3c27
ED		 4081 if (!net_eq(dev_net(ifa->idev->dev), net))
4082 continue;
1d578303
MM		 4083 /* sync with offset */
4084 if (p < state->offset) {
4085 p++;
4086 continue;
4087 }
4088 state->offset++;
9f0d3c27 4089 return ifa;
1d578303
MM		 4090 }
4091
4092 /* prepare for next bucket */
4093 state->offset = 0;
4094 p = 0;
1da177e4 4095 }
c2e21293 4096 return NULL;
1da177e4
LT		 4097}
4098
c2e21293 4099static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4100 struct inet6_ifaddr *ifa)
1da177e4
LT		 4101{
4102 struct if6_iter_state *state = seq->private;
1218854a 4103 struct net *net = seq_file_net(seq);
1da177e4 4104
b67bfe0d 4105 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 4106 if (!net_eq(dev_net(ifa->idev->dev), net))
4107 continue;
1d578303 4108 state->offset++;
9f0d3c27 4109 return ifa;
1d578303 4110 }
3c40090a 4111
c2e21293 4112 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 4113 state->offset = 0;
b67bfe0d 4114 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 4115 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 4116 if (!net_eq(dev_net(ifa->idev->dev), net))
4117 continue;
1d578303 4118 state->offset++;
9f0d3c27 4119 return ifa;
c2e21293 4120 }
1da177e4 4121 }
3c40090a 4122
c2e21293 4123 return NULL;
1da177e4
LT		 4124}
4125
1da177e4 4126static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 4127 __acquires(rcu_bh)
1da177e4 4128{
5c578aed 4129 rcu_read_lock_bh();
1d578303 4130 return if6_get_first(seq, *pos);
1da177e4
LT		 4131}
4132
4133static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4134{
4135 struct inet6_ifaddr *ifa;
4136
4137 ifa = if6_get_next(seq, v);
4138 ++*pos;
4139 return ifa;
4140}
4141
4142static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 4143 __releases(rcu_bh)
1da177e4 4144{
5c578aed 4145 rcu_read_unlock_bh();
1da177e4
LT		 4146}
4147
4148static int if6_seq_show(struct seq_file *seq, void *v)
4149{
4150 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4151 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4152 &ifp->addr,
1da177e4
LT		 4153 ifp->idev->dev->ifindex,
4154 ifp->prefix_len,
4155 ifp->scope,
971a351c 4156 (u8) ifp->flags,
1da177e4
LT		 4157 ifp->idev->dev->name);
4158 return 0;
4159}
4160
56b3d975 4161static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4162 .start = if6_seq_start,
4163 .next = if6_seq_next,
4164 .show = if6_seq_show,
4165 .stop = if6_seq_stop,
4166};
4167
4168static int if6_seq_open(struct inode *inode, struct file *file)
4169{
3c40090a
DL		 4170 return seq_open_net(inode, file, &if6_seq_ops,
4171 sizeof(struct if6_iter_state));
1da177e4
LT		 4172}
4173
9a32144e 4174static const struct file_operations if6_fops = {
1da177e4
LT		 4175 .owner = THIS_MODULE,
4176 .open = if6_seq_open,
4177 .read = seq_read,
4178 .llseek = seq_lseek,
3c40090a 4179 .release = seq_release_net,
1da177e4
LT		 4180};
4181
2c8c1e72 4182static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4183{
d4beaa66 4184 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 4185 return -ENOMEM;
4186 return 0;
4187}
4188
2c8c1e72 4189static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4190{
ece31ffd 4191 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4192}
4193
4194static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4195 .init = if6_proc_net_init,
4196 .exit = if6_proc_net_exit,
3c40090a
DL		 4197};
4198
4199int __init if6_proc_init(void)
4200{
4201 return register_pernet_subsys(&if6_proc_net_ops);
4202}
4203
1da177e4
LT		 4204void if6_proc_exit(void)
4205{
3c40090a 4206 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4207}
4208#endif /* CONFIG_PROC_FS */
4209
07a93626 4210#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4211/* Check if address is a home address configured on any interface. */
b71d1d42 4212int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 4213{
4214 int ret = 0;
c2e21293 4215 struct inet6_ifaddr *ifp = NULL;
ddbe5032 4216 unsigned int hash = inet6_addr_hash(addr);
c2e21293 4217
5c578aed 4218 rcu_read_lock_bh();
b67bfe0d 4219 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 4220 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 4221 continue;
caad295f 4222 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4223 (ifp->flags & IFA_F_HOMEADDRESS)) {
4224 ret = 1;
4225 break;
4226 }
4227 }
5c578aed 4228 rcu_read_unlock_bh();
3b9f9a1c
NT		 4229 return ret;
4230}
4231#endif
4232
1da177e4
LT		 4233/*
4234 * Periodic address status verification
4235 */
4236
c15b1cca 4237static void addrconf_verify_rtnl(void)
1da177e4 4238{
b2db7564 4239 unsigned long now, next, next_sec, next_sched;
1da177e4 4240 struct inet6_ifaddr *ifp;
1da177e4
LT		 4241 int i;
4242
c15b1cca
HFS		 4243 ASSERT_RTNL();
4244
5c578aed 4245 rcu_read_lock_bh();
1da177e4 4246 now = jiffies;
b2db7564 4247 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4248
c15b1cca 4249 cancel_delayed_work(&addr_chk_work);
1da177e4 4250
bcdd553f 4251 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4252restart:
c15b1cca 4253 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 4254 unsigned long age;
1da177e4 4255
fad8da3e
YA		 4256 /* When setting preferred_lft to a value not zero or
4257 * infinity, while valid_lft is infinity
4258 * IFA_F_PERMANENT has a non-infinity life time.
4259 */
4260 if ((ifp->flags & IFA_F_PERMANENT) &&
4261 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4262 continue;
4263
4264 spin_lock(&ifp->lock);
b2db7564
YH		 4265 /* We try to batch several events at once. */
4266 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4267
8f27ebb9
YH		 4268 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4269 age >= ifp->valid_lft) {
1da177e4
LT		 4270 spin_unlock(&ifp->lock);
4271 in6_ifa_hold(ifp);
1da177e4
LT		 4272 ipv6_del_addr(ifp);
4273 goto restart;
8f27ebb9
YH		 4274 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4275 spin_unlock(&ifp->lock);
4276 continue;
1da177e4 4277 } else if (age >= ifp->prefered_lft) {
a1ed0526 4278 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4279 int deprecate = 0;
4280
4281 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4282 deprecate = 1;
4283 ifp->flags |= IFA_F_DEPRECATED;
4284 }
4285
fad8da3e
YA		 4286 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4287 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4288 next = ifp->tstamp + ifp->valid_lft * HZ;
4289
4290 spin_unlock(&ifp->lock);
4291
4292 if (deprecate) {
4293 in6_ifa_hold(ifp);
1da177e4
LT		 4294
4295 ipv6_ifa_notify(0, ifp);
4296 in6_ifa_put(ifp);
4297 goto restart;
4298 }
1da177e4
LT		 4299 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4300 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4301 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4302 ifp->idev->cnf.dad_transmits *
1f9248e5 4303 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 4304
1da177e4
LT		 4305 if (age >= ifp->prefered_lft - regen_advance) {
4306 struct inet6_ifaddr *ifpub = ifp->ifpub;
4307 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4308 next = ifp->tstamp + ifp->prefered_lft * HZ;
4309 if (!ifp->regen_count && ifpub) {
4310 ifp->regen_count++;
4311 in6_ifa_hold(ifp);
4312 in6_ifa_hold(ifpub);
4313 spin_unlock(&ifp->lock);
5c578aed 4314
291d809b
HY		 4315 spin_lock(&ifpub->lock);
4316 ifpub->regen_count = 0;
4317 spin_unlock(&ifpub->lock);
1da177e4
LT		 4318 ipv6_create_tempaddr(ifpub, ifp);
4319 in6_ifa_put(ifpub);
4320 in6_ifa_put(ifp);
4321 goto restart;
4322 }
4323 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4324 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4325 spin_unlock(&ifp->lock);
1da177e4
LT		 4326 } else {
4327 /* ifp->prefered_lft <= ifp->valid_lft */
4328 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4329 next = ifp->tstamp + ifp->prefered_lft * HZ;
4330 spin_unlock(&ifp->lock);
4331 }
4332 }
1da177e4
LT		 4333 }
4334
b2db7564
YH		 4335 next_sec = round_jiffies_up(next);
4336 next_sched = next;
4337
4338 /* If rounded timeout is accurate enough, accept it. */
4339 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4340 next_sched = next_sec;
4341
4342 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4343 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4344 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4345
ba3542e1 4346 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4347 now, next, next_sec, next_sched);
c15b1cca 4348 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4349 rcu_read_unlock_bh();
1da177e4
LT		 4350}
4351
c15b1cca
HFS		 4352static void addrconf_verify_work(struct work_struct *w)
4353{
4354 rtnl_lock();
4355 addrconf_verify_rtnl();
4356 rtnl_unlock();
4357}
4358
4359static void addrconf_verify(void)
4360{
4361 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4362}
4363
caeaba79
ND		 4364static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4365 struct in6_addr **peer_pfx)
461d8837
TG		 4366{
4367 struct in6_addr *pfx = NULL;
4368
caeaba79
ND		 4369 *peer_pfx = NULL;
4370
461d8837
TG		 4371 if (addr)
4372 pfx = nla_data(addr);
4373
4374 if (local) {
4375 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4376 *peer_pfx = pfx;
4377 pfx = nla_data(local);
461d8837
TG		 4378 }
4379
4380 return pfx;
4381}
4382
ef7c79ed 4383static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4384 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4385 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4386 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4387 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 4388};
4389
1da177e4 4390static int
661d2967 4391inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4392{
3b1e0a65 4393 struct net *net = sock_net(skb->sk);
b933f716
TG		 4394 struct ifaddrmsg *ifm;
4395 struct nlattr *tb[IFA_MAX+1];
caeaba79 4396 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4397 u32 ifa_flags;
b933f716 4398 int err;
1da177e4 4399
b933f716
TG		 4400 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4401 if (err < 0)
4402 return err;
4403
4404 ifm = nlmsg_data(nlh);
caeaba79 4405 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4406 if (!pfx)
1da177e4
LT		 4407 return -EINVAL;
4408
6046d5b4
HK		 4409 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4410
4411 /* We ignore other flags so far. */
4412 ifa_flags &= IFA_F_MANAGETEMPADDR;
4413
4414 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4415 ifm->ifa_prefixlen);
1da177e4
LT		 4416}
4417
479840ff 4418static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 4419 u32 prefered_lft, u32 valid_lft)
081bba5b 4420{
6f704992
YH		 4421 u32 flags;
4422 clock_t expires;
4bed72e4 4423 unsigned long timeout;
53bd6749 4424 bool was_managetempaddr;
5b84efec 4425 bool had_prefixroute;
46d48046 4426
c15b1cca
HFS		 4427 ASSERT_RTNL();
4428
081bba5b
NT		 4429 if (!valid_lft || (prefered_lft > valid_lft))
4430 return -EINVAL;
4431
53bd6749
JP		 4432 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4433 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4434 return -EINVAL;
4435
4bed72e4
YH		 4436 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4437 if (addrconf_finite_timeout(timeout)) {
4438 expires = jiffies_to_clock_t(timeout * HZ);
4439 valid_lft = timeout;
6f704992 4440 flags = RTF_EXPIRES;
4bed72e4
YH		 4441 } else {
4442 expires = 0;
4443 flags = 0;
4444 ifa_flags |= IFA_F_PERMANENT;
6f704992 4445 }
081bba5b 4446
4bed72e4
YH		 4447 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4448 if (addrconf_finite_timeout(timeout)) {
4449 if (timeout == 0)
4450 ifa_flags |= IFA_F_DEPRECATED;
4451 prefered_lft = timeout;
4452 }
081bba5b
NT		 4453
4454 spin_lock_bh(&ifp->lock);
53bd6749 4455 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4456 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4457 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4458 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4459 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4460 IFA_F_NOPREFIXROUTE);
53bd6749 4461 ifp->flags |= ifa_flags;
081bba5b
NT		 4462 ifp->tstamp = jiffies;
4463 ifp->valid_lft = valid_lft;
4464 ifp->prefered_lft = prefered_lft;
4465
4466 spin_unlock_bh(&ifp->lock);
4467 if (!(ifp->flags&IFA_F_TENTATIVE))
4468 ipv6_ifa_notify(0, ifp);
081bba5b 4469
761aac73
TH		 4470 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4471 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4472 expires, flags);
5b84efec
TH		 4473 } else if (had_prefixroute) {
4474 enum cleanup_prefix_rt_t action;
4475 unsigned long rt_expires;
4476
4477 write_lock_bh(&ifp->idev->lock);
4478 action = check_cleanup_prefix_route(ifp, &rt_expires);
4479 write_unlock_bh(&ifp->idev->lock);
4480
4481 if (action != CLEANUP_PREFIX_RT_NOP) {
4482 cleanup_prefix_route(ifp, rt_expires,
4483 action == CLEANUP_PREFIX_RT_DEL);
4484 }
761aac73 4485 }
53bd6749
JP		 4486
4487 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4488 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4489 valid_lft = prefered_lft = 0;
4490 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4491 !was_managetempaddr, jiffies);
4492 }
4493
c15b1cca 4494 addrconf_verify_rtnl();
081bba5b
NT		 4495
4496 return 0;
4497}
4498
1da177e4 4499static int
661d2967 4500inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 4501{
3b1e0a65 4502 struct net *net = sock_net(skb->sk);
461d8837
TG		 4503 struct ifaddrmsg *ifm;
4504 struct nlattr *tb[IFA_MAX+1];
caeaba79 4505 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 4506 struct inet6_ifaddr *ifa;
4507 struct net_device *dev;
55ebaef1 4508 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 4509 u32 ifa_flags;
461d8837 4510 int err;
1da177e4 4511
461d8837
TG		 4512 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4513 if (err < 0)
4514 return err;
4515
4516 ifm = nlmsg_data(nlh);
caeaba79 4517 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4518 if (!pfx)
1da177e4
LT		 4519 return -EINVAL;
4520
461d8837 4521 if (tb[IFA_CACHEINFO]) {
0778769d 4522 struct ifa_cacheinfo *ci;
461d8837
TG		 4523
4524 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 4525 valid_lft = ci->ifa_valid;
461d8837
TG		 4526 preferred_lft = ci->ifa_prefered;
4527 } else {
4528 preferred_lft = INFINITY_LIFE_TIME;
4529 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 4530 }
4531
af284937 4532 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4533 if (!dev)
7198f8ce
TG		 4534 return -ENODEV;
4535
479840ff
JP		 4536 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4537
55ebaef1 4538 /* We ignore other flags so far. */
761aac73 4539 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
93a714d6 4540 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
55ebaef1 4541
1cab3da6 4542 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
63159f29 4543 if (!ifa) {
7198f8ce
TG		 4544 /*
4545 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4546 * userspace already relies on not having to provide this.
7198f8ce 4547 */
caeaba79 4548 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 4549 ifm->ifa_prefixlen, ifa_flags,
4550 preferred_lft, valid_lft);
081bba5b
NT		 4551 }
4552
7198f8ce
TG		 4553 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4554 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4555 err = -EEXIST;
4556 else
55ebaef1 4557 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 4558
4559 in6_ifa_put(ifa);
4560
4561 return err;
1da177e4
LT		 4562}
4563
479840ff 4564static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4565 u8 scope, int ifindex)
4566{
4567 struct ifaddrmsg *ifm;
4568
4569 ifm = nlmsg_data(nlh);
4570 ifm->ifa_family = AF_INET6;
4571 ifm->ifa_prefixlen = prefixlen;
4572 ifm->ifa_flags = flags;
4573 ifm->ifa_scope = scope;
4574 ifm->ifa_index = ifindex;
4575}
4576
85486af0
TG		 4577static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4578 unsigned long tstamp, u32 preferred, u32 valid)
4579{
4580 struct ifa_cacheinfo ci;
4581
18a31e1e
TG		 4582 ci.cstamp = cstamp_delta(cstamp);
4583 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4584 ci.ifa_prefered = preferred;
4585 ci.ifa_valid = valid;
4586
4587 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4588}
4589
101bb229
TG		 4590static inline int rt_scope(int ifa_scope)
4591{
4592 if (ifa_scope & IFA_HOST)
4593 return RT_SCOPE_HOST;
4594 else if (ifa_scope & IFA_LINK)
4595 return RT_SCOPE_LINK;
4596 else if (ifa_scope & IFA_SITE)
4597 return RT_SCOPE_SITE;
4598 else
4599 return RT_SCOPE_UNIVERSE;
4600}
4601
0ab6803b
TG		 4602static inline int inet6_ifaddr_msgsize(void)
4603{
339bf98f 4604 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4605 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4606 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4607 + nla_total_size(sizeof(struct ifa_cacheinfo))
4608 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4609}
c5396a31 4610
1da177e4 4611static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4612 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4613{
1da177e4 4614 struct nlmsghdr *nlh;
85486af0 4615 u32 preferred, valid;
1da177e4 4616
15e47304 4617 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4618 if (!nlh)
26932566 4619 return -EMSGSIZE;
0ab6803b 4620
101bb229
TG		 4621 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4622 ifa->idev->dev->ifindex);
4623
fad8da3e
YA		 4624 if (!((ifa->flags&IFA_F_PERMANENT) &&
4625 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4626 preferred = ifa->prefered_lft;
4627 valid = ifa->valid_lft;
4628 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4629 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4630 if (preferred > tval)
4631 preferred -= tval;
4632 else
4633 preferred = 0;
f56619fc
BH		 4634 if (valid != INFINITY_LIFE_TIME) {
4635 if (valid > tval)
4636 valid -= tval;
4637 else
4638 valid = 0;
4639 }
1da177e4
LT		 4640 }
4641 } else {
85486af0
TG		 4642 preferred = INFINITY_LIFE_TIME;
4643 valid = INFINITY_LIFE_TIME;
4644 }
4645
7996c799 4646 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4647 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4648 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4649 goto error;
4650 } else
930345ea 4651 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4652 goto error;
4653
4654 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4655 goto error;
1da177e4 4656
479840ff
JP		 4657 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4658 goto error;
4659
053c095a
JB		 4660 nlmsg_end(skb, nlh);
4661 return 0;
caeaba79
ND		 4662
4663error:
4664 nlmsg_cancel(skb, nlh);
4665 return -EMSGSIZE;
1da177e4
LT		 4666}
4667
4668static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4669 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4670{
1da177e4 4671 struct nlmsghdr *nlh;
101bb229
TG		 4672 u8 scope = RT_SCOPE_UNIVERSE;
4673 int ifindex = ifmca->idev->dev->ifindex;
4674
4675 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4676 scope = RT_SCOPE_SITE;
1da177e4 4677
15e47304 4678 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4679 if (!nlh)
26932566 4680 return -EMSGSIZE;
85486af0 4681
0ab6803b 4682 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4683 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4684 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4685 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4686 nlmsg_cancel(skb, nlh);
4687 return -EMSGSIZE;
4688 }
85486af0 4689
053c095a
JB		 4690 nlmsg_end(skb, nlh);
4691 return 0;
1da177e4
LT		 4692}
4693
4694static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4695 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4696{
1da177e4 4697 struct nlmsghdr *nlh;
101bb229
TG		 4698 u8 scope = RT_SCOPE_UNIVERSE;
4699 int ifindex = ifaca->aca_idev->dev->ifindex;
4700
4701 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4702 scope = RT_SCOPE_SITE;
1da177e4 4703
15e47304 4704 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4705 if (!nlh)
26932566 4706 return -EMSGSIZE;
85486af0 4707
0ab6803b 4708 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4709 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4710 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4711 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4712 nlmsg_cancel(skb, nlh);
4713 return -EMSGSIZE;
4714 }
1da177e4 4715
053c095a
JB		 4716 nlmsg_end(skb, nlh);
4717 return 0;
1da177e4
LT		 4718}
4719
e21e8467 4720enum addr_type_t {
1da177e4
LT		 4721 UNICAST_ADDR,
4722 MULTICAST_ADDR,
4723 ANYCAST_ADDR,
4724};
4725
234b27c3
ED		 4726/* called with rcu_read_lock() */
4727static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4728 struct netlink_callback *cb, enum addr_type_t type,
4729 int s_ip_idx, int *p_ip_idx)
4730{
234b27c3
ED		 4731 struct ifmcaddr6 *ifmca;
4732 struct ifacaddr6 *ifaca;
4733 int err = 1;
4734 int ip_idx = *p_ip_idx;
4735
4736 read_lock_bh(&idev->lock);
4737 switch (type) {
502a2ffd 4738 case UNICAST_ADDR: {
4739 struct inet6_ifaddr *ifa;
4740
234b27c3 4741 /* unicast address incl. temp addr */
502a2ffd 4742 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4743 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4744 continue;
4745 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4746 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4747 cb->nlh->nlmsg_seq,
4748 RTM_NEWADDR,
4749 NLM_F_MULTI);
053c095a 4750 if (err < 0)
234b27c3 4751 break;
63998ac2 4752 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4753 }
4754 break;
502a2ffd 4755 }
234b27c3
ED		 4756 case MULTICAST_ADDR:
4757 /* multicast address */
4758 for (ifmca = idev->mc_list; ifmca;
4759 ifmca = ifmca->next, ip_idx++) {
4760 if (ip_idx < s_ip_idx)
4761 continue;
4762 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4763 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4764 cb->nlh->nlmsg_seq,
4765 RTM_GETMULTICAST,
4766 NLM_F_MULTI);
053c095a 4767 if (err < 0)
234b27c3
ED		 4768 break;
4769 }
4770 break;
4771 case ANYCAST_ADDR:
4772 /* anycast address */
4773 for (ifaca = idev->ac_list; ifaca;
4774 ifaca = ifaca->aca_next, ip_idx++) {
4775 if (ip_idx < s_ip_idx)
4776 continue;
4777 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4778 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4779 cb->nlh->nlmsg_seq,
4780 RTM_GETANYCAST,
4781 NLM_F_MULTI);
053c095a 4782 if (err < 0)
234b27c3
ED		 4783 break;
4784 }
4785 break;
4786 default:
4787 break;
4788 }
4789 read_unlock_bh(&idev->lock);
4790 *p_ip_idx = ip_idx;
4791 return err;
4792}
4793
1da177e4
LT		 4794static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4795 enum addr_type_t type)
4796{
234b27c3
ED		 4797 struct net *net = sock_net(skb->sk);
4798 int h, s_h;
1da177e4
LT		 4799 int idx, ip_idx;
4800 int s_idx, s_ip_idx;
1da177e4 4801 struct net_device *dev;
234b27c3
ED		 4802 struct inet6_dev *idev;
4803 struct hlist_head *head;
1ab1457c 4804
234b27c3
ED		 4805 s_h = cb->args[0];
4806 s_idx = idx = cb->args[1];
4807 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4808
234b27c3 4809 rcu_read_lock();
63998ac2 4810 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4811 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4812 idx = 0;
4813 head = &net->dev_index_head[h];
b67bfe0d 4814 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4815 if (idx < s_idx)
4816 goto cont;
4b97efdf 4817 if (h > s_h || idx > s_idx)
234b27c3
ED		 4818 s_ip_idx = 0;
4819 ip_idx = 0;
e21e8467
SH		 4820 idev = __in6_dev_get(dev);
4821 if (!idev)
234b27c3
ED		 4822 goto cont;
4823
4824 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4825 s_ip_idx, &ip_idx) < 0)
234b27c3 4826 goto done;
7562f876 4827cont:
234b27c3
ED		 4828 idx++;
4829 }
1da177e4 4830 }
234b27c3
ED		 4831done:
4832 rcu_read_unlock();
4833 cb->args[0] = h;
4834 cb->args[1] = idx;
4835 cb->args[2] = ip_idx;
4836
1da177e4
LT		 4837 return skb->len;
4838}
4839
4840static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4841{
4842 enum addr_type_t type = UNICAST_ADDR;
b854272b 4843
1da177e4
LT		 4844 return inet6_dump_addr(skb, cb, type);
4845}
4846
4847static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4848{
4849 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4850
1da177e4
LT		 4851 return inet6_dump_addr(skb, cb, type);
4852}
4853
4854
4855static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4856{
4857 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4858
1da177e4
LT		 4859 return inet6_dump_addr(skb, cb, type);
4860}
4861
661d2967 4862static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
6c223828 4863{
3b1e0a65 4864 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4865 struct ifaddrmsg *ifm;
4866 struct nlattr *tb[IFA_MAX+1];
caeaba79 4867 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4868 struct net_device *dev = NULL;
4869 struct inet6_ifaddr *ifa;
4870 struct sk_buff *skb;
6c223828
NT		 4871 int err;
4872
1b29fc2c
TG		 4873 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4874 if (err < 0)
4875 goto errout;
4876
caeaba79 4877 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
63159f29 4878 if (!addr) {
1b29fc2c
TG		 4879 err = -EINVAL;
4880 goto errout;
6c223828 4881 }
6c223828 4882
1b29fc2c 4883 ifm = nlmsg_data(nlh);
6c223828 4884 if (ifm->ifa_index)
6fda7350 4885 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4886
e21e8467
SH		 4887 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4888 if (!ifa) {
1b29fc2c
TG		 4889 err = -EADDRNOTAVAIL;
4890 goto errout;
4891 }
6c223828 4892
e21e8467
SH		 4893 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4894 if (!skb) {
6c223828 4895 err = -ENOBUFS;
1b29fc2c 4896 goto errout_ifa;
6c223828
NT		 4897 }
4898
15e47304 4899 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4900 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4901 if (err < 0) {
4902 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4903 WARN_ON(err == -EMSGSIZE);
4904 kfree_skb(skb);
4905 goto errout_ifa;
4906 }
15e47304 4907 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4908errout_ifa:
6c223828 4909 in6_ifa_put(ifa);
1b29fc2c 4910errout:
6c223828 4911 return err;
6c223828
NT		 4912}
4913
1da177e4
LT		 4914static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4915{
4916 struct sk_buff *skb;
c346dca1 4917 struct net *net = dev_net(ifa->idev->dev);
5d620266 4918 int err = -ENOBUFS;
1da177e4 4919
f784ad3d
MB		 4920 /* Don't send DELADDR notification for TENTATIVE address,
4921 * since NEWADDR notification is sent only after removing
4922 * TENTATIVE flag.
4923 */
4924 if (ifa->flags & IFA_F_TENTATIVE && event == RTM_DELADDR)
4925 return;
4926
0ab6803b 4927 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 4928 if (!skb)
5d620266
TG		 4929 goto errout;
4930
4931 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4932 if (err < 0) {
4933 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4934 WARN_ON(err == -EMSGSIZE);
4935 kfree_skb(skb);
4936 goto errout;
4937 }
1ce85fe4
PNA		 4938 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4939 return;
5d620266
TG		 4940errout:
4941 if (err < 0)
6fda7350 4942 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4943}
4944
b6f99a21 4945static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4946 __s32 *array, int bytes)
4947{
04561c1f
TG		 4948 BUG_ON(bytes < (DEVCONF_MAX * 4));
4949
1da177e4
LT		 4950 memset(array, 0, bytes);
4951 array[DEVCONF_FORWARDING] = cnf->forwarding;
4952 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4953 array[DEVCONF_MTU6] = cnf->mtu6;
4954 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4955 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4956 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4957 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4958 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4959 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4960 jiffies_to_msecs(cnf->rtr_solicit_interval);
bd11f074
MŻ		 4961 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
4962 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
93908d19
TG		 4963 array[DEVCONF_RTR_SOLICIT_DELAY] =
4964 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4965 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4966 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4967 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4968 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4969 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4970 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4971 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4972 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4973 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4974 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 4975 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 4976 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 4977 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 4978 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 4979#ifdef CONFIG_IPV6_ROUTER_PREF
4980 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 4981 array[DEVCONF_RTR_PROBE_INTERVAL] =
4982 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 4983#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 4984 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
09c884d4
YH		 4985 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4986#endif
930d6ff2 4987#endif
fbea49e1 4988 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 4989 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 4990#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4991 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 4992 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 4993#endif
7bc570c8
YH		 4994#ifdef CONFIG_IPV6_MROUTE
4995 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4996#endif
778d80be 4997 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 4998 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 4999 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 5000 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 5001 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 5002 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 5003 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 5004 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 5005 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 5006 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 5007 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 5008 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 5009 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1ababeba 5010 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
bf355b8d
DL		 5011#ifdef CONFIG_IPV6_SEG6_HMAC
5012 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5013#endif
adc176c5 5014 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
d35a00b8 5015 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
df789fe7 5016 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
1da177e4
LT		 5017}
5018
b382b191
TG		 5019static inline size_t inet6_ifla6_size(void)
5020{
5021 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5022 + nla_total_size(sizeof(struct ifla_cacheinfo))
5023 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5024 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 5025 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5026 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 5027}
5028
339bf98f
TG		 5029static inline size_t inet6_if_nlmsg_size(void)
5030{
5031 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5032 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5033 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5034 + nla_total_size(4) /* IFLA_MTU */
5035 + nla_total_size(4) /* IFLA_LINK */
0344338b 5036 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 5037 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 5038}
c5396a31 5039
be281e55 5040static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
aca05671 5041 int bytes)
7f7d9a6b
HX		 5042{
5043 int i;
aca05671 5044 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
7f7d9a6b
HX		 5045 BUG_ON(pad < 0);
5046
5047 /* Use put_unaligned() because stats may not be aligned for u64. */
aca05671
JH		 5048 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5049 for (i = 1; i < ICMP6_MIB_MAX; i++)
be281e55 5050 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b 5051
aca05671 5052 memset(&stats[ICMP6_MIB_MAX], 0, pad);
7f7d9a6b
HX		 5053}
5054
698365fa 5055static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 5056 int bytes, size_t syncpoff)
4ce3c183 5057{
a3a77372
R		 5058 int i, c;
5059 u64 buff[IPSTATS_MIB_MAX];
5060 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5061
4ce3c183
ED		 5062 BUG_ON(pad < 0);
5063
a3a77372
R		 5064 memset(buff, 0, sizeof(buff));
5065 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 5066
a3a77372
R		 5067 for_each_possible_cpu(c) {
5068 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5069 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5070 }
5071
5072 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5073 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 5074}
5075
7f7d9a6b
HX		 5076static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5077 int bytes)
5078{
e21e8467 5079 switch (attrtype) {
7f7d9a6b 5080 case IFLA_INET6_STATS:
a3a77372
R		 5081 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5082 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 5083 break;
5084 case IFLA_INET6_ICMP6STATS:
aca05671 5085 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
7f7d9a6b
HX		 5086 break;
5087 }
5088}
5089
d5566fd7
SV		 5090static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5091 u32 ext_filter_mask)
b382b191
TG		 5092{
5093 struct nlattr *nla;
5094 struct ifla_cacheinfo ci;
5095
c78679e8
DM		 5096 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5097 goto nla_put_failure;
b382b191 5098 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 5099 ci.tstamp = cstamp_delta(idev->tstamp);
5100 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 5101 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 5102 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5103 goto nla_put_failure;
b382b191 5104 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 5105 if (!nla)
b382b191
TG		 5106 goto nla_put_failure;
5107 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5108
5109 /* XXX - MC not implemented */
5110
d5566fd7
SV		 5111 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5112 return 0;
5113
b382b191 5114 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 5115 if (!nla)
b382b191
TG		 5116 goto nla_put_failure;
5117 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5118
5119 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 5120 if (!nla)
b382b191
TG		 5121 goto nla_put_failure;
5122 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5123
f53adae4 5124 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 5125 if (!nla)
f53adae4 5126 goto nla_put_failure;
bc91b0f0 5127
d35a00b8 5128 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
bc91b0f0
JP		 5129 goto nla_put_failure;
5130
f53adae4
DB		 5131 read_lock_bh(&idev->lock);
5132 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5133 read_unlock_bh(&idev->lock);
5134
b382b191
TG		 5135 return 0;
5136
5137nla_put_failure:
5138 return -EMSGSIZE;
5139}
5140
b1974ed0
AR		 5141static size_t inet6_get_link_af_size(const struct net_device *dev,
5142 u32 ext_filter_mask)
b382b191
TG		 5143{
5144 if (!__in6_dev_get(dev))
5145 return 0;
5146
5147 return inet6_ifla6_size();
5148}
5149
d5566fd7
SV		 5150static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5151 u32 ext_filter_mask)
b382b191
TG		 5152{
5153 struct inet6_dev *idev = __in6_dev_get(dev);
5154
5155 if (!idev)
5156 return -ENODATA;
5157
d5566fd7 5158 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5159 return -EMSGSIZE;
5160
5161 return 0;
5162}
5163
f53adae4
DB		 5164static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5165{
f53adae4
DB		 5166 struct inet6_ifaddr *ifp;
5167 struct net_device *dev = idev->dev;
47e27d5e 5168 bool clear_token, update_rs = false;
dc848292 5169 struct in6_addr ll_addr;
f53adae4 5170
c15b1cca
HFS		 5171 ASSERT_RTNL();
5172
63159f29 5173 if (!token)
f53adae4 5174 return -EINVAL;
f53adae4
DB		 5175 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5176 return -EINVAL;
f53adae4
DB		 5177 if (!ipv6_accept_ra(idev))
5178 return -EINVAL;
bd11f074 5179 if (idev->cnf.rtr_solicits == 0)
f53adae4
DB		 5180 return -EINVAL;
5181
5182 write_lock_bh(&idev->lock);
5183
5184 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5185 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5186
5187 write_unlock_bh(&idev->lock);
5188
47e27d5e
DB		 5189 clear_token = ipv6_addr_any(token);
5190 if (clear_token)
5191 goto update_lft;
5192
dc848292
HFS		 5193 if (!idev->dead && (idev->if_flags & IF_READY) &&
5194 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5195 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5196 /* If we're not ready, then normal ifup will take care
5197 * of this. Otherwise, we need to request our rs here.
5198 */
5199 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5200 update_rs = true;
5201 }
f53adae4 5202
47e27d5e 5203update_lft:
f53adae4 5204 write_lock_bh(&idev->lock);
fc403832 5205
77ecaace 5206 if (update_rs) {
fc403832 5207 idev->if_flags |= IF_RS_SENT;
bd11f074
MŻ		 5208 idev->rs_interval = rfc3315_s14_backoff_init(
5209 idev->cnf.rtr_solicit_interval);
77ecaace 5210 idev->rs_probes = 1;
bd11f074 5211 addrconf_mod_rs_timer(idev, idev->rs_interval);
77ecaace 5212 }
f53adae4
DB		 5213
5214 /* Well, that's kinda nasty ... */
5215 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5216 spin_lock(&ifp->lock);
617fe29d 5217 if (ifp->tokenized) {
f53adae4
DB		 5218 ifp->valid_lft = 0;
5219 ifp->prefered_lft = 0;
5220 }
5221 spin_unlock(&ifp->lock);
5222 }
5223
5224 write_unlock_bh(&idev->lock);
b2ed64a9 5225 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 5226 addrconf_verify_rtnl();
f53adae4
DB		 5227 return 0;
5228}
5229
11b1f828
DB		 5230static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5231 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5232 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5233};
5234
5235static int inet6_validate_link_af(const struct net_device *dev,
5236 const struct nlattr *nla)
5237{
5238 struct nlattr *tb[IFLA_INET6_MAX + 1];
5239
5240 if (dev && !__in6_dev_get(dev))
5241 return -EAFNOSUPPORT;
5242
5243 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5244}
5245
d35a00b8
FJ		 5246static int check_addr_gen_mode(int mode)
5247{
5248 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5249 mode != IN6_ADDR_GEN_MODE_NONE &&
5250 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5251 mode != IN6_ADDR_GEN_MODE_RANDOM)
5252 return -EINVAL;
5253 return 1;
5254}
5255
5256static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5257 int mode)
5258{
5259 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5260 !idev->cnf.stable_secret.initialized &&
5261 !net->ipv6.devconf_dflt->stable_secret.initialized)
5262 return -EINVAL;
5263 return 1;
5264}
5265
f53adae4
DB		 5266static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5267{
5268 int err = -EINVAL;
5269 struct inet6_dev *idev = __in6_dev_get(dev);
5270 struct nlattr *tb[IFLA_INET6_MAX + 1];
5271
5272 if (!idev)
5273 return -EAFNOSUPPORT;
5274
5275 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5276 BUG();
5277
bc91b0f0 5278 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 5279 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 5280 if (err)
5281 return err;
5282 }
5283
5284 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5285 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5286
d35a00b8
FJ		 5287 if (check_addr_gen_mode(mode) < 0 ||
5288 check_stable_privacy(idev, dev_net(dev), mode) < 0)
bc91b0f0 5289 return -EINVAL;
622c81d5 5290
d35a00b8 5291 idev->cnf.addr_gen_mode = mode;
bc91b0f0
JP		 5292 err = 0;
5293 }
f53adae4
DB		 5294
5295 return err;
5296}
5297
1ab1457c 5298static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5299 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5300{
04561c1f 5301 struct net_device *dev = idev->dev;
04561c1f
TG		 5302 struct ifinfomsg *hdr;
5303 struct nlmsghdr *nlh;
5304 void *protoinfo;
04561c1f 5305
15e47304 5306 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5307 if (!nlh)
26932566 5308 return -EMSGSIZE;
04561c1f
TG		 5309
5310 hdr = nlmsg_data(nlh);
5311 hdr->ifi_family = AF_INET6;
5312 hdr->__ifi_pad = 0;
5313 hdr->ifi_type = dev->type;
5314 hdr->ifi_index = dev->ifindex;
5315 hdr->ifi_flags = dev_get_flags(dev);
5316 hdr->ifi_change = 0;
5317
c78679e8
DM		 5318 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5319 (dev->addr_len &&
5320 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5321 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5322 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5323 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5324 nla_put_u8(skb, IFLA_OPERSTATE,
5325 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5326 goto nla_put_failure;
04561c1f 5327 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 5328 if (!protoinfo)
04561c1f 5329 goto nla_put_failure;
1da177e4 5330
d5566fd7 5331 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5332 goto nla_put_failure;
1da177e4 5333
04561c1f 5334 nla_nest_end(skb, protoinfo);
053c095a
JB		 5335 nlmsg_end(skb, nlh);
5336 return 0;
1da177e4 5337
04561c1f 5338nla_put_failure:
26932566
PM		 5339 nlmsg_cancel(skb, nlh);
5340 return -EMSGSIZE;
1da177e4
LT		 5341}
5342
5343static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5344{
3b1e0a65 5345 struct net *net = sock_net(skb->sk);
84d2697d 5346 int h, s_h;
434a8a58 5347 int idx = 0, s_idx;
1da177e4
LT		 5348 struct net_device *dev;
5349 struct inet6_dev *idev;
84d2697d 5350 struct hlist_head *head;
1da177e4 5351
84d2697d
ED		 5352 s_h = cb->args[0];
5353 s_idx = cb->args[1];
5354
5355 rcu_read_lock();
5356 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5357 idx = 0;
5358 head = &net->dev_index_head[h];
b67bfe0d 5359 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5360 if (idx < s_idx)
5361 goto cont;
5362 idev = __in6_dev_get(dev);
5363 if (!idev)
5364 goto cont;
5365 if (inet6_fill_ifinfo(skb, idev,
15e47304 5366 NETLINK_CB(cb->skb).portid,
84d2697d 5367 cb->nlh->nlmsg_seq,
053c095a 5368 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5369 goto out;
7562f876 5370cont:
84d2697d
ED		 5371 idx++;
5372 }
1da177e4 5373 }
84d2697d
ED		 5374out:
5375 rcu_read_unlock();
5376 cb->args[1] = idx;
5377 cb->args[0] = h;
1da177e4
LT		 5378
5379 return skb->len;
5380}
5381
5382void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5383{
5384 struct sk_buff *skb;
c346dca1 5385 struct net *net = dev_net(idev->dev);
8d7a76c9 5386 int err = -ENOBUFS;
1ab1457c 5387
339bf98f 5388 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5389 if (!skb)
8d7a76c9
TG		 5390 goto errout;
5391
5392 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5393 if (err < 0) {
5394 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5395 WARN_ON(err == -EMSGSIZE);
5396 kfree_skb(skb);
5397 goto errout;
5398 }
5f75a104 5399 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5400 return;
8d7a76c9
TG		 5401errout:
5402 if (err < 0)
5f75a104 5403 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5404}
5405
339bf98f
TG		 5406static inline size_t inet6_prefix_nlmsg_size(void)
5407{
5408 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5409 + nla_total_size(sizeof(struct in6_addr))
5410 + nla_total_size(sizeof(struct prefix_cacheinfo));
5411}
c5396a31 5412
1da177e4 5413static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5414 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5415 int event, unsigned int flags)
1da177e4 5416{
6051e2f4
TG		 5417 struct prefixmsg *pmsg;
5418 struct nlmsghdr *nlh;
1da177e4
LT		 5419 struct prefix_cacheinfo ci;
5420
15e47304 5421 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5422 if (!nlh)
26932566 5423 return -EMSGSIZE;
6051e2f4
TG		 5424
5425 pmsg = nlmsg_data(nlh);
1da177e4 5426 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5427 pmsg->prefix_pad1 = 0;
5428 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5429 pmsg->prefix_ifindex = idev->dev->ifindex;
5430 pmsg->prefix_len = pinfo->prefix_len;
5431 pmsg->prefix_type = pinfo->type;
8a47077a 5432 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5433 pmsg->prefix_flags = 0;
5434 if (pinfo->onlink)
5435 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5436 if (pinfo->autoconf)
5437 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5438
c78679e8
DM		 5439 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5440 goto nla_put_failure;
1da177e4
LT		 5441 ci.preferred_time = ntohl(pinfo->prefered);
5442 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5443 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5444 goto nla_put_failure;
053c095a
JB		 5445 nlmsg_end(skb, nlh);
5446 return 0;
1da177e4 5447
6051e2f4 5448nla_put_failure:
26932566
PM		 5449 nlmsg_cancel(skb, nlh);
5450 return -EMSGSIZE;
1da177e4
LT		 5451}
5452
1ab1457c 5453static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5454 struct prefix_info *pinfo)
5455{
5456 struct sk_buff *skb;
c346dca1 5457 struct net *net = dev_net(idev->dev);
8c384bfa 5458 int err = -ENOBUFS;
1da177e4 5459
339bf98f 5460 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5461 if (!skb)
8c384bfa
TG		 5462 goto errout;
5463
5464 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5465 if (err < 0) {
5466 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5467 WARN_ON(err == -EMSGSIZE);
5468 kfree_skb(skb);
5469 goto errout;
5470 }
1ce85fe4
PNA		 5471 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5472 return;
8c384bfa
TG		 5473errout:
5474 if (err < 0)
6fda7350 5475 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5476}
5477
1da177e4
LT		 5478static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5479{
63998ac2
ND		 5480 struct net *net = dev_net(ifp->idev->dev);
5481
c15b1cca
HFS		 5482 if (event)
5483 ASSERT_RTNL();
5484
1da177e4
LT		 5485 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5486
5487 switch (event) {
5488 case RTM_NEWADDR:
95c385b4
NH		 5489 /*
5490 * If the address was optimistic
5491 * we inserted the route at the start of
5492 * our DAD process, so we don't need
5493 * to do it again
5494 */
5495 if (!(ifp->rt->rt6i_node))
5496 ip6_ins_rt(ifp->rt);
1da177e4
LT		 5497 if (ifp->idev->cnf.forwarding)
5498 addrconf_join_anycast(ifp);
7996c799 5499 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 5500 addrconf_prefix_route(&ifp->peer_addr, 128,
5501 ifp->idev->dev, 0, 0);
1da177e4
LT		 5502 break;
5503 case RTM_DELADDR:
5504 if (ifp->idev->cnf.forwarding)
5505 addrconf_leave_anycast(ifp);
5506 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5507 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 5508 struct rt6_info *rt;
caeaba79 5509
e7478dfc
ND		 5510 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5511 ifp->idev->dev, 0, 0);
8e3d5be7
MKL		 5512 if (rt)
5513 ip6_del_rt(rt);
caeaba79 5514 }
38bd10c4
DA		 5515 if (ifp->rt) {
5516 dst_hold(&ifp->rt->dst);
5517 ip6_del_rt(ifp->rt);
5518 }
705f1c86 5519 rt_genid_bump_ipv6(net);
1da177e4
LT		 5520 break;
5521 }
63998ac2 5522 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5523}
5524
5525static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5526{
8814c4b5 5527 rcu_read_lock_bh();
1da177e4
LT		 5528 if (likely(ifp->idev->dead == 0))
5529 __ipv6_ifa_notify(event, ifp);
8814c4b5 5530 rcu_read_unlock_bh();
1da177e4
LT		 5531}
5532
5533#ifdef CONFIG_SYSCTL
5534
5535static
fe2c6338 5536int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5537 void __user *buffer, size_t *lenp, loff_t *ppos)
5538{
5539 int *valp = ctl->data;
5540 int val = *valp;
88af182e 5541 loff_t pos = *ppos;
fe2c6338 5542 struct ctl_table lctl;
1da177e4
LT		 5543 int ret;
5544
013d97e9
FR		 5545 /*
5546 * ctl->data points to idev->cnf.forwarding, we should
5547 * not modify it until we get the rtnl lock.
5548 */
5549 lctl = *ctl;
5550 lctl.data = &val;
5551
5552 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5553
c8fecf22 5554 if (write)
b325fddb 5555 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5556 if (ret)
5557 *ppos = pos;
1ab1457c 5558 return ret;
1da177e4
LT		 5559}
5560
77751427
ML		 5561static
5562int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5563 void __user *buffer, size_t *lenp, loff_t *ppos)
5564{
5565 struct inet6_dev *idev = ctl->extra1;
5566 int min_mtu = IPV6_MIN_MTU;
5567 struct ctl_table lctl;
5568
5569 lctl = *ctl;
5570 lctl.extra1 = &min_mtu;
5571 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5572
5573 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5574}
5575
56d417b1
BH		 5576static void dev_disable_change(struct inet6_dev *idev)
5577{
75538c2b
CW		 5578 struct netdev_notifier_info info;
5579
56d417b1
BH		 5580 if (!idev || !idev->dev)
5581 return;
5582
75538c2b 5583 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5584 if (idev->cnf.disable_ipv6)
75538c2b 5585 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5586 else
75538c2b 5587 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5588}
5589
5590static void addrconf_disable_change(struct net *net, __s32 newf)
5591{
5592 struct net_device *dev;
5593 struct inet6_dev *idev;
5594
03e4deff 5595 for_each_netdev(net, dev) {
56d417b1
BH		 5596 idev = __in6_dev_get(dev);
5597 if (idev) {
5598 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5599 idev->cnf.disable_ipv6 = newf;
5600 if (changed)
5601 dev_disable_change(idev);
5602 }
56d417b1 5603 }
56d417b1
BH		 5604}
5605
013d97e9 5606static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5607{
5608 struct net *net;
013d97e9
FR		 5609 int old;
5610
5611 if (!rtnl_trylock())
5612 return restart_syscall();
56d417b1
BH		 5613
5614 net = (struct net *)table->extra2;
013d97e9
FR		 5615 old = *p;
5616 *p = newf;
56d417b1 5617
013d97e9
FR		 5618 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5619 rtnl_unlock();
56d417b1 5620 return 0;
88af182e 5621 }
56d417b1
BH		 5622
5623 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5624 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5625 addrconf_disable_change(net, newf);
013d97e9 5626 } else if ((!newf) ^ (!old))
56d417b1
BH		 5627 dev_disable_change((struct inet6_dev *)table->extra1);
5628
5629 rtnl_unlock();
5630 return 0;
5631}
5632
5633static
fe2c6338 5634int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5635 void __user *buffer, size_t *lenp, loff_t *ppos)
5636{
5637 int *valp = ctl->data;
5638 int val = *valp;
88af182e 5639 loff_t pos = *ppos;
fe2c6338 5640 struct ctl_table lctl;
56d417b1
BH		 5641 int ret;
5642
013d97e9
FR		 5643 /*
5644 * ctl->data points to idev->cnf.disable_ipv6, we should
5645 * not modify it until we get the rtnl lock.
5646 */
5647 lctl = *ctl;
5648 lctl.data = &val;
5649
5650 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5651
5652 if (write)
5653 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5654 if (ret)
5655 *ppos = pos;
56d417b1
BH		 5656 return ret;
5657}
5658
c92d5491 5659static
5660int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5661 void __user *buffer, size_t *lenp, loff_t *ppos)
5662{
5663 int *valp = ctl->data;
5664 int ret;
5665 int old, new;
5666
5667 old = *valp;
5668 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5669 new = *valp;
5670
5671 if (write && old != new) {
5672 struct net *net = ctl->extra2;
5673
5674 if (!rtnl_trylock())
5675 return restart_syscall();
5676
5677 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5678 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5679 NETCONFA_IFINDEX_DEFAULT,
5680 net->ipv6.devconf_dflt);
5681 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5682 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5683 NETCONFA_IFINDEX_ALL,
5684 net->ipv6.devconf_all);
5685 else {
5686 struct inet6_dev *idev = ctl->extra1;
5687
5688 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5689 idev->dev->ifindex,
5690 &idev->cnf);
5691 }
5692 rtnl_unlock();
5693 }
5694
5695 return ret;
5696}
5697
d35a00b8
FJ		 5698static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5699 void __user *buffer, size_t *lenp,
5700 loff_t *ppos)
5701{
5702 int ret = 0;
5703 int new_val;
5704 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5705 struct net *net = (struct net *)ctl->extra2;
5706
8c171d6c
FJ		 5707 if (!rtnl_trylock())
5708 return restart_syscall();
5709
d35a00b8
FJ		 5710 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5711
5712 if (write) {
5713 new_val = *((int *)ctl->data);
5714
8c171d6c
FJ		 5715 if (check_addr_gen_mode(new_val) < 0) {
5716 ret = -EINVAL;
5717 goto out;
5718 }
d35a00b8
FJ		 5719
5720 /* request for default */
5721 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5722 ipv6_devconf_dflt.addr_gen_mode = new_val;
5723
5724 /* request for individual net device */
5725 } else {
5726 if (!idev)
8c171d6c 5727 goto out;
d35a00b8 5728
8c171d6c
FJ		 5729 if (check_stable_privacy(idev, net, new_val) < 0) {
5730 ret = -EINVAL;
5731 goto out;
5732 }
d35a00b8
FJ		 5733
5734 if (idev->cnf.addr_gen_mode != new_val) {
5735 idev->cnf.addr_gen_mode = new_val;
d35a00b8 5736 addrconf_dev_config(idev->dev);
d35a00b8
FJ		 5737 }
5738 }
5739 }
5740
8c171d6c
FJ		 5741out:
5742 rtnl_unlock();
5743
d35a00b8
FJ		 5744 return ret;
5745}
5746
3d1bec99
HFS		 5747static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5748 void __user *buffer, size_t *lenp,
5749 loff_t *ppos)
5750{
5751 int err;
5752 struct in6_addr addr;
5753 char str[IPV6_MAX_STRLEN];
5754 struct ctl_table lctl = *ctl;
622c81d5 5755 struct net *net = ctl->extra2;
3d1bec99
HFS		 5756 struct ipv6_stable_secret *secret = ctl->data;
5757
622c81d5
HFS		 5758 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5759 return -EIO;
5760
3d1bec99
HFS		 5761 lctl.maxlen = IPV6_MAX_STRLEN;
5762 lctl.data = str;
5763
5764 if (!rtnl_trylock())
5765 return restart_syscall();
5766
5767 if (!write && !secret->initialized) {
5768 err = -EIO;
5769 goto out;
5770 }
5771
5449a5ca
WC		 5772 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5773 if (err >= sizeof(str)) {
5774 err = -EIO;
5775 goto out;
3d1bec99
HFS		 5776 }
5777
5778 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5779 if (err || !write)
5780 goto out;
5781
5782 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5783 err = -EIO;
5784 goto out;
5785 }
5786
5787 secret->initialized = true;
5788 secret->secret = addr;
5789
622c81d5
HFS		 5790 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5791 struct net_device *dev;
5792
5793 for_each_netdev(net, dev) {
5794 struct inet6_dev *idev = __in6_dev_get(dev);
5795
5796 if (idev) {
d35a00b8 5797 idev->cnf.addr_gen_mode =
622c81d5
HFS		 5798 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5799 }
5800 }
5801 } else {
5802 struct inet6_dev *idev = ctl->extra1;
5803
d35a00b8 5804 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
622c81d5
HFS		 5805 }
5806
3d1bec99
HFS		 5807out:
5808 rtnl_unlock();
5809
5810 return err;
5811}
c92d5491 5812
35103d11
AG		 5813static
5814int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5815 int write,
5816 void __user *buffer,
5817 size_t *lenp,
5818 loff_t *ppos)
5819{
5820 int *valp = ctl->data;
5821 int val = *valp;
5822 loff_t pos = *ppos;
5823 struct ctl_table lctl;
5824 int ret;
5825
5826 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5827 * we should not modify it until we get the rtnl lock.
5828 */
5829 lctl = *ctl;
5830 lctl.data = &val;
5831
5832 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5833
5834 if (write)
5835 ret = addrconf_fixup_linkdown(ctl, valp, val);
5836 if (ret)
5837 *ppos = pos;
5838 return ret;
5839}
5840
df789fe7
DF		 5841static
5842void addrconf_set_nopolicy(struct rt6_info *rt, int action)
5843{
5844 if (rt) {
5845 if (action)
5846 rt->dst.flags |= DST_NOPOLICY;
5847 else
5848 rt->dst.flags &= ~DST_NOPOLICY;
5849 }
5850}
5851
5852static
5853void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
5854{
5855 struct inet6_ifaddr *ifa;
5856
5857 read_lock_bh(&idev->lock);
5858 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5859 spin_lock(&ifa->lock);
5860 if (ifa->rt) {
5861 struct rt6_info *rt = ifa->rt;
5862 struct fib6_table *table = rt->rt6i_table;
5863 int cpu;
5864
5865 read_lock(&table->tb6_lock);
5866 addrconf_set_nopolicy(ifa->rt, val);
5867 if (rt->rt6i_pcpu) {
5868 for_each_possible_cpu(cpu) {
5869 struct rt6_info **rtp;
5870
5871 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
5872 addrconf_set_nopolicy(*rtp, val);
5873 }
5874 }
5875 read_unlock(&table->tb6_lock);
5876 }
5877 spin_unlock(&ifa->lock);
5878 }
5879 read_unlock_bh(&idev->lock);
5880}
5881
5882static
5883int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
5884{
5885 struct inet6_dev *idev;
5886 struct net *net;
5887
5888 if (!rtnl_trylock())
5889 return restart_syscall();
5890
5891 *valp = val;
5892
5893 net = (struct net *)ctl->extra2;
5894 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
5895 rtnl_unlock();
5896 return 0;
5897 }
5898
5899 if (valp == &net->ipv6.devconf_all->disable_policy) {
5900 struct net_device *dev;
5901
5902 for_each_netdev(net, dev) {
5903 idev = __in6_dev_get(dev);
5904 if (idev)
5905 addrconf_disable_policy_idev(idev, val);
5906 }
5907 } else {
5908 idev = (struct inet6_dev *)ctl->extra1;
5909 addrconf_disable_policy_idev(idev, val);
5910 }
5911
5912 rtnl_unlock();
5913 return 0;
5914}
5915
5916static
5917int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
5918 void __user *buffer, size_t *lenp,
5919 loff_t *ppos)
5920{
5921 int *valp = ctl->data;
5922 int val = *valp;
5923 loff_t pos = *ppos;
5924 struct ctl_table lctl;
5925 int ret;
5926
5927 lctl = *ctl;
5928 lctl.data = &val;
5929 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5930
5931 if (write && (*valp != val))
5932 ret = addrconf_disable_policy(ctl, valp, val);
5933
5934 if (ret)
5935 *ppos = pos;
5936
5937 return ret;
5938}
5939
cb4a4c69 5940static int minus_one = -1;
cb9e684e
MŻ		 5941static const int one = 1;
5942static const int two_five_five = 255;
5943
607ea7cd 5944static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 5945 {
5946 .procname = "forwarding",
5947 .data = &ipv6_devconf.forwarding,
5948 .maxlen = sizeof(int),
5949 .mode = 0644,
5950 .proc_handler = addrconf_sysctl_forward,
5951 },
5952 {
5953 .procname = "hop_limit",
5954 .data = &ipv6_devconf.hop_limit,
5955 .maxlen = sizeof(int),
5956 .mode = 0644,
cb9e684e
MŻ		 5957 .proc_handler = proc_dointvec_minmax,
5958 .extra1 = (void *)&one,
5959 .extra2 = (void *)&two_five_five,
5df1f77f
KK		 5960 },
5961 {
5962 .procname = "mtu",
5963 .data = &ipv6_devconf.mtu6,
5964 .maxlen = sizeof(int),
5965 .mode = 0644,
5966 .proc_handler = addrconf_sysctl_mtu,
5967 },
5968 {
5969 .procname = "accept_ra",
5970 .data = &ipv6_devconf.accept_ra,
5971 .maxlen = sizeof(int),
5972 .mode = 0644,
5973 .proc_handler = proc_dointvec,
5974 },
5975 {
5976 .procname = "accept_redirects",
5977 .data = &ipv6_devconf.accept_redirects,
5978 .maxlen = sizeof(int),
5979 .mode = 0644,
5980 .proc_handler = proc_dointvec,
5981 },
5982 {
5983 .procname = "autoconf",
5984 .data = &ipv6_devconf.autoconf,
5985 .maxlen = sizeof(int),
5986 .mode = 0644,
5987 .proc_handler = proc_dointvec,
5988 },
5989 {
5990 .procname = "dad_transmits",
5991 .data = &ipv6_devconf.dad_transmits,
5992 .maxlen = sizeof(int),
5993 .mode = 0644,
5994 .proc_handler = proc_dointvec,
5995 },
5996 {
5997 .procname = "router_solicitations",
5998 .data = &ipv6_devconf.rtr_solicits,
5999 .maxlen = sizeof(int),
6000 .mode = 0644,
cb4a4c69
MŻ		 6001 .proc_handler = proc_dointvec_minmax,
6002 .extra1 = &minus_one,
5df1f77f
KK		 6003 },
6004 {
6005 .procname = "router_solicitation_interval",
6006 .data = &ipv6_devconf.rtr_solicit_interval,
6007 .maxlen = sizeof(int),
6008 .mode = 0644,
6009 .proc_handler = proc_dointvec_jiffies,
6010 },
bd11f074
MŻ		 6011 {
6012 .procname = "router_solicitation_max_interval",
6013 .data = &ipv6_devconf.rtr_solicit_max_interval,
6014 .maxlen = sizeof(int),
6015 .mode = 0644,
6016 .proc_handler = proc_dointvec_jiffies,
6017 },
5df1f77f
KK		 6018 {
6019 .procname = "router_solicitation_delay",
6020 .data = &ipv6_devconf.rtr_solicit_delay,
6021 .maxlen = sizeof(int),
6022 .mode = 0644,
6023 .proc_handler = proc_dointvec_jiffies,
6024 },
6025 {
6026 .procname = "force_mld_version",
6027 .data = &ipv6_devconf.force_mld_version,
6028 .maxlen = sizeof(int),
6029 .mode = 0644,
6030 .proc_handler = proc_dointvec,
6031 },
6032 {
6033 .procname = "mldv1_unsolicited_report_interval",
6034 .data =
6035 &ipv6_devconf.mldv1_unsolicited_report_interval,
6036 .maxlen = sizeof(int),
6037 .mode = 0644,
6038 .proc_handler = proc_dointvec_ms_jiffies,
6039 },
6040 {
6041 .procname = "mldv2_unsolicited_report_interval",
6042 .data =
6043 &ipv6_devconf.mldv2_unsolicited_report_interval,
6044 .maxlen = sizeof(int),
6045 .mode = 0644,
6046 .proc_handler = proc_dointvec_ms_jiffies,
6047 },
6048 {
6049 .procname = "use_tempaddr",
6050 .data = &ipv6_devconf.use_tempaddr,
6051 .maxlen = sizeof(int),
6052 .mode = 0644,
6053 .proc_handler = proc_dointvec,
6054 },
6055 {
6056 .procname = "temp_valid_lft",
6057 .data = &ipv6_devconf.temp_valid_lft,
6058 .maxlen = sizeof(int),
6059 .mode = 0644,
6060 .proc_handler = proc_dointvec,
6061 },
6062 {
6063 .procname = "temp_prefered_lft",
6064 .data = &ipv6_devconf.temp_prefered_lft,
6065 .maxlen = sizeof(int),
6066 .mode = 0644,
6067 .proc_handler = proc_dointvec,
6068 },
6069 {
6070 .procname = "regen_max_retry",
6071 .data = &ipv6_devconf.regen_max_retry,
6072 .maxlen = sizeof(int),
6073 .mode = 0644,
6074 .proc_handler = proc_dointvec,
6075 },
6076 {
6077 .procname = "max_desync_factor",
6078 .data = &ipv6_devconf.max_desync_factor,
6079 .maxlen = sizeof(int),
6080 .mode = 0644,
6081 .proc_handler = proc_dointvec,
6082 },
6083 {
6084 .procname = "max_addresses",
6085 .data = &ipv6_devconf.max_addresses,
6086 .maxlen = sizeof(int),
6087 .mode = 0644,
6088 .proc_handler = proc_dointvec,
6089 },
6090 {
6091 .procname = "accept_ra_defrtr",
6092 .data = &ipv6_devconf.accept_ra_defrtr,
6093 .maxlen = sizeof(int),
6094 .mode = 0644,
6095 .proc_handler = proc_dointvec,
6096 },
6097 {
6098 .procname = "accept_ra_min_hop_limit",
6099 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6100 .maxlen = sizeof(int),
6101 .mode = 0644,
6102 .proc_handler = proc_dointvec,
6103 },
6104 {
6105 .procname = "accept_ra_pinfo",
6106 .data = &ipv6_devconf.accept_ra_pinfo,
6107 .maxlen = sizeof(int),
6108 .mode = 0644,
6109 .proc_handler = proc_dointvec,
6110 },
930d6ff2 6111#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 6112 {
6113 .procname = "accept_ra_rtr_pref",
6114 .data = &ipv6_devconf.accept_ra_rtr_pref,
6115 .maxlen = sizeof(int),
6116 .mode = 0644,
6117 .proc_handler = proc_dointvec,
6118 },
6119 {
6120 .procname = "router_probe_interval",
6121 .data = &ipv6_devconf.rtr_probe_interval,
6122 .maxlen = sizeof(int),
6123 .mode = 0644,
6124 .proc_handler = proc_dointvec_jiffies,
6125 },
fa03ef38 6126#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b
JS		 6127 {
6128 .procname = "accept_ra_rt_info_min_plen",
6129 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6130 .maxlen = sizeof(int),
6131 .mode = 0644,
6132 .proc_handler = proc_dointvec,
6133 },
5df1f77f
KK		 6134 {
6135 .procname = "accept_ra_rt_info_max_plen",
6136 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6137 .maxlen = sizeof(int),
6138 .mode = 0644,
6139 .proc_handler = proc_dointvec,
6140 },
09c884d4 6141#endif
930d6ff2 6142#endif
5df1f77f
KK		 6143 {
6144 .procname = "proxy_ndp",
6145 .data = &ipv6_devconf.proxy_ndp,
6146 .maxlen = sizeof(int),
6147 .mode = 0644,
6148 .proc_handler = addrconf_sysctl_proxy_ndp,
6149 },
6150 {
6151 .procname = "accept_source_route",
6152 .data = &ipv6_devconf.accept_source_route,
6153 .maxlen = sizeof(int),
6154 .mode = 0644,
6155 .proc_handler = proc_dointvec,
6156 },
95c385b4 6157#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 6158 {
6159 .procname = "optimistic_dad",
6160 .data = &ipv6_devconf.optimistic_dad,
6161 .maxlen = sizeof(int),
6162 .mode = 0644,
6163 .proc_handler = proc_dointvec,
6164 },
6165 {
6166 .procname = "use_optimistic",
6167 .data = &ipv6_devconf.use_optimistic,
6168 .maxlen = sizeof(int),
6169 .mode = 0644,
6170 .proc_handler = proc_dointvec,
6171 },
7bc570c8
YH		 6172#endif
6173#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 6174 {
6175 .procname = "mc_forwarding",
6176 .data = &ipv6_devconf.mc_forwarding,
6177 .maxlen = sizeof(int),
6178 .mode = 0444,
6179 .proc_handler = proc_dointvec,
6180 },
95c385b4 6181#endif
5df1f77f
KK		 6182 {
6183 .procname = "disable_ipv6",
6184 .data = &ipv6_devconf.disable_ipv6,
6185 .maxlen = sizeof(int),
6186 .mode = 0644,
6187 .proc_handler = addrconf_sysctl_disable,
6188 },
6189 {
6190 .procname = "accept_dad",
6191 .data = &ipv6_devconf.accept_dad,
6192 .maxlen = sizeof(int),
6193 .mode = 0644,
6194 .proc_handler = proc_dointvec,
6195 },
6196 {
6197 .procname = "force_tllao",
6198 .data = &ipv6_devconf.force_tllao,
6199 .maxlen = sizeof(int),
6200 .mode = 0644,
6201 .proc_handler = proc_dointvec
6202 },
6203 {
6204 .procname = "ndisc_notify",
6205 .data = &ipv6_devconf.ndisc_notify,
6206 .maxlen = sizeof(int),
6207 .mode = 0644,
6208 .proc_handler = proc_dointvec
6209 },
6210 {
6211 .procname = "suppress_frag_ndisc",
6212 .data = &ipv6_devconf.suppress_frag_ndisc,
6213 .maxlen = sizeof(int),
6214 .mode = 0644,
6215 .proc_handler = proc_dointvec
6216 },
6217 {
6218 .procname = "accept_ra_from_local",
6219 .data = &ipv6_devconf.accept_ra_from_local,
6220 .maxlen = sizeof(int),
6221 .mode = 0644,
6222 .proc_handler = proc_dointvec,
6223 },
6224 {
6225 .procname = "accept_ra_mtu",
6226 .data = &ipv6_devconf.accept_ra_mtu,
6227 .maxlen = sizeof(int),
6228 .mode = 0644,
6229 .proc_handler = proc_dointvec,
6230 },
6231 {
6232 .procname = "stable_secret",
6233 .data = &ipv6_devconf.stable_secret,
6234 .maxlen = IPV6_MAX_STRLEN,
6235 .mode = 0600,
6236 .proc_handler = addrconf_sysctl_stable_secret,
6237 },
6238 {
6239 .procname = "use_oif_addrs_only",
6240 .data = &ipv6_devconf.use_oif_addrs_only,
6241 .maxlen = sizeof(int),
6242 .mode = 0644,
6243 .proc_handler = proc_dointvec,
6244 },
6245 {
6246 .procname = "ignore_routes_with_linkdown",
6247 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6248 .maxlen = sizeof(int),
6249 .mode = 0644,
6250 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6251 },
6252 {
6253 .procname = "drop_unicast_in_l2_multicast",
6254 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6255 .maxlen = sizeof(int),
6256 .mode = 0644,
6257 .proc_handler = proc_dointvec,
6258 },
6259 {
6260 .procname = "drop_unsolicited_na",
6261 .data = &ipv6_devconf.drop_unsolicited_na,
6262 .maxlen = sizeof(int),
6263 .mode = 0644,
6264 .proc_handler = proc_dointvec,
6265 },
6266 {
6267 .procname = "keep_addr_on_down",
6268 .data = &ipv6_devconf.keep_addr_on_down,
6269 .maxlen = sizeof(int),
6270 .mode = 0644,
6271 .proc_handler = proc_dointvec,
6272
6273 },
1ababeba
DL		 6274 {
6275 .procname = "seg6_enabled",
6276 .data = &ipv6_devconf.seg6_enabled,
6277 .maxlen = sizeof(int),
6278 .mode = 0644,
6279 .proc_handler = proc_dointvec,
6280 },
bf355b8d
DL		 6281#ifdef CONFIG_IPV6_SEG6_HMAC
6282 {
6283 .procname = "seg6_require_hmac",
6284 .data = &ipv6_devconf.seg6_require_hmac,
6285 .maxlen = sizeof(int),
6286 .mode = 0644,
6287 .proc_handler = proc_dointvec,
6288 },
6289#endif
adc176c5
EN		 6290 {
6291 .procname = "enhanced_dad",
6292 .data = &ipv6_devconf.enhanced_dad,
6293 .maxlen = sizeof(int),
6294 .mode = 0644,
6295 .proc_handler = proc_dointvec,
6296 },
d35a00b8
FJ		 6297 {
6298 .procname = "addr_gen_mode",
6299 .data = &ipv6_devconf.addr_gen_mode,
6300 .maxlen = sizeof(int),
6301 .mode = 0644,
6302 .proc_handler = addrconf_sysctl_addr_gen_mode,
6303 },
df789fe7
DF		 6304 {
6305 .procname = "disable_policy",
6306 .data = &ipv6_devconf.disable_policy,
6307 .maxlen = sizeof(int),
6308 .mode = 0644,
6309 .proc_handler = addrconf_sysctl_disable_policy,
6310 },
5df1f77f
KK		 6311 {
6312 /* sentinel */
6313 }
1da177e4
LT		 6314};
6315
bff16c2f 6316static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 6317 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4 6318{
29c994e3 6319 int i, ifindex;
607ea7cd 6320 struct ctl_table *table;
6105e293 6321 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 6322
607ea7cd
KK		 6323 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6324 if (!table)
f68635e6
PE		 6325 goto out;
6326
607ea7cd
KK		 6327 for (i = 0; table[i].data; i++) {
6328 table[i].data += (char *)p - (char *)&ipv6_devconf;
cb9e684e
MŻ		 6329 /* If one of these is already set, then it is not safe to
6330 * overwrite either of them: this makes proc_dointvec_minmax
6331 * usable.
6332 */
6333 if (!table[i].extra1 && !table[i].extra2) {
6334 table[i].extra1 = idev; /* embedded; no ref */
6335 table[i].extra2 = net;
6336 }
1da177e4 6337 }
1da177e4 6338
6105e293 6339 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 6340
607ea7cd
KK		 6341 p->sysctl_header = register_net_sysctl(net, path, table);
6342 if (!p->sysctl_header)
6105e293 6343 goto free;
f68635e6 6344
29c994e3
ND		 6345 if (!strcmp(dev_name, "all"))
6346 ifindex = NETCONFA_IFINDEX_ALL;
6347 else if (!strcmp(dev_name, "default"))
6348 ifindex = NETCONFA_IFINDEX_DEFAULT;
6349 else
6350 ifindex = idev->dev->ifindex;
6351 inet6_netconf_notify_devconf(net, NETCONFA_ALL, ifindex, p);
95897312 6352 return 0;
1da177e4 6353
f68635e6 6354free:
607ea7cd 6355 kfree(table);
f68635e6 6356out:
95897312 6357 return -ENOBUFS;
1da177e4
LT		 6358}
6359
408c4768
PE		 6360static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
6361{
607ea7cd 6362 struct ctl_table *table;
408c4768 6363
607ea7cd 6364 if (!p->sysctl_header)
408c4768
PE		 6365 return;
6366
607ea7cd
KK		 6367 table = p->sysctl_header->ctl_table_arg;
6368 unregister_net_sysctl_table(p->sysctl_header);
6369 p->sysctl_header = NULL;
6370 kfree(table);
408c4768
PE		 6371}
6372
a317a2f1 6373static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 6374{
a317a2f1
WC		 6375 int err;
6376
6377 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6378 return -EINVAL;
6379
6380 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6381 &ndisc_ifinfo_sysctl_change);
6382 if (err)
6383 return err;
6384 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6385 idev, &idev->cnf);
6386 if (err)
6387 neigh_sysctl_unregister(idev->nd_parms);
6388
6389 return err;
f52295a9
PE		 6390}
6391
408c4768 6392static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 6393{
408c4768
PE		 6394 __addrconf_sysctl_unregister(&idev->cnf);
6395 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 6396}
6397
6398
6399#endif
6400
2c8c1e72 6401static int __net_init addrconf_init_net(struct net *net)
e0da5a48 6402{
a79ca223 6403 int err = -ENOMEM;
e0da5a48
PE		 6404 struct ipv6_devconf *all, *dflt;
6405
a79ca223 6406 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 6407 if (!all)
a79ca223 6408 goto err_alloc_all;
e0da5a48 6409
a79ca223 6410 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 6411 if (!dflt)
a79ca223 6412 goto err_alloc_dflt;
e0da5a48 6413
a79ca223
HZ		 6414 /* these will be inherited by all namespaces */
6415 dflt->autoconf = ipv6_defaults.autoconf;
6416 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 6417
3d1bec99
HFS		 6418 dflt->stable_secret.initialized = false;
6419 all->stable_secret.initialized = false;
6420
e0da5a48
PE		 6421 net->ipv6.devconf_all = all;
6422 net->ipv6.devconf_dflt = dflt;
6423
6424#ifdef CONFIG_SYSCTL
f8572d8f 6425 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 6426 if (err < 0)
6427 goto err_reg_all;
6428
f8572d8f 6429 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 6430 if (err < 0)
6431 goto err_reg_dflt;
6432#endif
6433 return 0;
6434
6435#ifdef CONFIG_SYSCTL
6436err_reg_dflt:
6437 __addrconf_sysctl_unregister(all);
6438err_reg_all:
6439 kfree(dflt);
6440#endif
6441err_alloc_dflt:
6442 kfree(all);
6443err_alloc_all:
6444 return err;
6445}
6446
2c8c1e72 6447static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 6448{
6449#ifdef CONFIG_SYSCTL
6450 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
6451 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
6452#endif
73cf0e92 6453 kfree(net->ipv6.devconf_dflt);
6454 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 6455}
6456
6457static struct pernet_operations addrconf_ops = {
6458 .init = addrconf_init_net,
6459 .exit = addrconf_exit_net,
6460};
6461
207895fd 6462static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 6463 .family = AF_INET6,
6464 .fill_link_af = inet6_fill_link_af,
6465 .get_link_af_size = inet6_get_link_af_size,
11b1f828 6466 .validate_link_af = inet6_validate_link_af,
f53adae4 6467 .set_link_af = inet6_set_link_af,
b382b191
TG		 6468};
6469
1da177e4
LT		 6470/*
6471 * Init / cleanup code
6472 */
6473
6474int __init addrconf_init(void)
6475{
a317a2f1 6476 struct inet6_dev *idev;
c2e21293 6477 int i, err;
2a8cc6c8 6478
e21e8467
SH		 6479 err = ipv6_addr_label_init();
6480 if (err < 0) {
f3213831
JP		 6481 pr_crit("%s: cannot initialize default policy table: %d\n",
6482 __func__, err);
2cc6d2bf 6483 goto out;
2a8cc6c8 6484 }
1da177e4 6485
2cc6d2bf
NH		 6486 err = register_pernet_subsys(&addrconf_ops);
6487 if (err < 0)
6488 goto out_addrlabel;
e0da5a48 6489
c15b1cca
HFS		 6490 addrconf_wq = create_workqueue("ipv6_addrconf");
6491 if (!addrconf_wq) {
6492 err = -ENOMEM;
6493 goto out_nowq;
6494 }
6495
1da177e4
LT		 6496 /* The addrconf netdev notifier requires that loopback_dev
6497 * has it's ipv6 private information allocated and setup
6498 * before it can bring up and give link-local addresses
6499 * to other devices which are up.
6500 *
6501 * Unfortunately, loopback_dev is not necessarily the first
6502 * entry in the global dev_base list of net devices. In fact,
6503 * it is likely to be the very last entry on that list.
6504 * So this causes the notifier registry below to try and
6505 * give link-local addresses to all devices besides loopback_dev
6506 * first, then loopback_dev, which cases all the non-loopback_dev
6507 * devices to fail to get a link-local address.
6508 *
6509 * So, as a temporary fix, allocate the ipv6 structure for
6510 * loopback_dev first by hand.
6511 * Longer term, all of the dependencies ipv6 has upon the loopback
6512 * device and it being up should be removed.
6513 */
6514 rtnl_lock();
a317a2f1 6515 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 6516 rtnl_unlock();
a317a2f1
WC		 6517 if (IS_ERR(idev)) {
6518 err = PTR_ERR(idev);
e0da5a48 6519 goto errlo;
a317a2f1 6520 }
1da177e4 6521
c2e21293 6522 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6523 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6524
1da177e4
LT		 6525 register_netdevice_notifier(&ipv6_dev_notf);
6526
c15b1cca 6527 addrconf_verify();
c127ea2c 6528
3678a9d8 6529 rtnl_af_register(&inet6_ops);
b382b191 6530
c7ac8679
GR		 6531 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6532 NULL);
c127ea2c
TG		 6533 if (err < 0)
6534 goto errout;
6535
6536 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 6537 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6538 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6539 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6540 inet6_dump_ifaddr, NULL);
6541 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6542 inet6_dump_ifmcaddr, NULL);
6543 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6544 inet6_dump_ifacaddr, NULL);
76f8f6cb 6545 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 6546 inet6_netconf_dump_devconf, NULL);
c127ea2c 6547
2a8cc6c8
YH		 6548 ipv6_addr_label_rtnl_register();
6549
1da177e4 6550 return 0;
c127ea2c 6551errout:
b382b191 6552 rtnl_af_unregister(&inet6_ops);
c127ea2c 6553 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6554errlo:
c15b1cca
HFS		 6555 destroy_workqueue(addrconf_wq);
6556out_nowq:
e0da5a48 6557 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 6558out_addrlabel:
6559 ipv6_addr_label_cleanup();
6560out:
c127ea2c 6561 return err;
1da177e4
LT		 6562}
6563
09f7709f 6564void addrconf_cleanup(void)
1da177e4 6565{
176c39af 6566 struct net_device *dev;
1da177e4
LT		 6567 int i;
6568
6569 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6570 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 6571 ipv6_addr_label_cleanup();
1da177e4
LT		 6572
6573 rtnl_lock();
6574
b382b191
TG		 6575 __rtnl_af_unregister(&inet6_ops);
6576
176c39af
DL		 6577 /* clean dev list */
6578 for_each_netdev(&init_net, dev) {
6579 if (__in6_dev_get(dev) == NULL)
6580 continue;
6581 addrconf_ifdown(dev, 1);
6582 }
6583 addrconf_ifdown(init_net.loopback_dev, 2);
6584
1da177e4
LT		 6585 /*
6586 * Check hash table.
6587 */
5c578aed 6588 spin_lock_bh(&addrconf_hash_lock);
c2e21293 6589 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6590 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 6591 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 6592 cancel_delayed_work(&addr_chk_work);
1da177e4 6593 rtnl_unlock();
c15b1cca
HFS		 6594
6595 destroy_workqueue(addrconf_wq);
1da177e4 6596}
Linux 6.x block layer and io_uring tree(s)