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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{
f8a894b2
XL		 335 in6_ifa_hold(ifp);
336 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
337 in6_ifa_put(ifp);
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. */
1be92460 429 refcount_set(&ndev->refcnt, 1);
1da177e4 430
1b34be74
YH		 431 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
432 ndev->cnf.accept_dad = -1;
433
07a93626 434#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 435 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 436 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 437 ndev->cnf.rtr_solicits = 0;
438 }
439#endif
440
372e6c8f 441 INIT_LIST_HEAD(&ndev->tempaddr_list);
76506a98 442 ndev->desync_factor = U32_MAX;
322f74a4
IO		 443 if ((dev->flags&IFF_LOOPBACK) ||
444 dev->type == ARPHRD_TUNNEL ||
9625ed72 445 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 446 dev->type == ARPHRD_SIT ||
0be669bb 447 dev->type == ARPHRD_NONE) {
322f74a4 448 ndev->cnf.use_tempaddr = -1;
9d6280da
JB		 449 } else
450 ipv6_regen_rndid(ndev);
5d9efa7e 451
914faa14 452 ndev->token = in6addr_any;
1da177e4 453
f24e3d65 454 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 455 ndev->if_flags |= IF_READY;
456
322f74a4
IO		 457 ipv6_mc_init_dev(ndev);
458 ndev->tstamp = jiffies;
a317a2f1
WC		 459 err = addrconf_sysctl_register(ndev);
460 if (err) {
461 ipv6_mc_destroy_dev(ndev);
2a189f9e 462 snmp6_unregister_dev(ndev);
a317a2f1
WC		 463 goto err_release;
464 }
30c4cf57 465 /* protected by rtnl_lock */
cf778b00 466 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 467
2c5e8933
HFS		 468 /* Join interface-local all-node multicast group */
469 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
470
d88ae4cc 471 /* Join all-node multicast group */
f3ee4010 472 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 473
d6ddef9e 474 /* Join all-router multicast group if forwarding is set */
8b2aaede 475 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 476 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
477
1da177e4 478 return ndev;
a317a2f1
WC		 479
480err_release:
481 neigh_parms_release(&nd_tbl, ndev->nd_parms);
482 ndev->dead = 1;
483 in6_dev_finish_destroy(ndev);
484 return ERR_PTR(err);
1da177e4
LT		 485}
486
8e5e8f30 487static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 488{
489 struct inet6_dev *idev;
490
491 ASSERT_RTNL();
492
e21e8467
SH		 493 idev = __in6_dev_get(dev);
494 if (!idev) {
495 idev = ipv6_add_dev(dev);
a317a2f1 496 if (IS_ERR(idev))
1da177e4
LT		 497 return NULL;
498 }
c5e33bdd 499
1da177e4
LT		 500 if (dev->flags&IFF_UP)
501 ipv6_mc_up(idev);
502 return idev;
503}
504
f3a1bfb1
ND		 505static int inet6_netconf_msgsize_devconf(int type)
506{
507 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
508 + nla_total_size(4); /* NETCONFA_IFINDEX */
136ba622 509 bool all = false;
f3a1bfb1 510
136ba622
ZS		 511 if (type == NETCONFA_ALL)
512 all = true;
513
514 if (all || type == NETCONFA_FORWARDING)
f3a1bfb1 515 size += nla_total_size(4);
b1afce95 516#ifdef CONFIG_IPV6_MROUTE
136ba622 517 if (all || type == NETCONFA_MC_FORWARDING)
d67b8c61 518 size += nla_total_size(4);
b1afce95 519#endif
136ba622 520 if (all || type == NETCONFA_PROXY_NEIGH)
c92d5491 521 size += nla_total_size(4);
f3a1bfb1 522
136ba622 523 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
35103d11
AG		 524 size += nla_total_size(4);
525
f3a1bfb1
ND		 526 return size;
527}
528
529static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
530 struct ipv6_devconf *devconf, u32 portid,
531 u32 seq, int event, unsigned int flags,
532 int type)
533{
534 struct nlmsghdr *nlh;
535 struct netconfmsg *ncm;
136ba622 536 bool all = false;
f3a1bfb1
ND		 537
538 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
539 flags);
63159f29 540 if (!nlh)
f3a1bfb1
ND		 541 return -EMSGSIZE;
542
136ba622
ZS		 543 if (type == NETCONFA_ALL)
544 all = true;
545
f3a1bfb1
ND		 546 ncm = nlmsg_data(nlh);
547 ncm->ncm_family = AF_INET6;
548
549 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
550 goto nla_put_failure;
551
23452170
DA		 552 if (!devconf)
553 goto out;
554
136ba622 555 if ((all || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 556 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
557 goto nla_put_failure;
b1afce95 558#ifdef CONFIG_IPV6_MROUTE
136ba622 559 if ((all || type == NETCONFA_MC_FORWARDING) &&
d67b8c61
ND		 560 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
561 devconf->mc_forwarding) < 0)
562 goto nla_put_failure;
b1afce95 563#endif
136ba622 564 if ((all || type == NETCONFA_PROXY_NEIGH) &&
c92d5491 565 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
566 goto nla_put_failure;
567
136ba622 568 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
35103d11
AG		 569 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
570 devconf->ignore_routes_with_linkdown) < 0)
571 goto nla_put_failure;
572
23452170 573out:
053c095a
JB		 574 nlmsg_end(skb, nlh);
575 return 0;
f3a1bfb1
ND		 576
577nla_put_failure:
578 nlmsg_cancel(skb, nlh);
579 return -EMSGSIZE;
580}
581
85b3daad
DA		 582void inet6_netconf_notify_devconf(struct net *net, int event, int type,
583 int ifindex, struct ipv6_devconf *devconf)
f3a1bfb1
ND		 584{
585 struct sk_buff *skb;
586 int err = -ENOBUFS;
587
927265bc 588 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
63159f29 589 if (!skb)
f3a1bfb1
ND		 590 goto errout;
591
592 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
85b3daad 593 event, 0, type);
f3a1bfb1
ND		 594 if (err < 0) {
595 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
596 WARN_ON(err == -EMSGSIZE);
597 kfree_skb(skb);
598 goto errout;
599 }
927265bc 600 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
f3a1bfb1
ND		 601 return;
602errout:
bd779028 603 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 604}
605
76f8f6cb
ND		 606static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
607 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
608 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 609 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
35103d11 610 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
76f8f6cb
ND		 611};
612
613static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
c21ef3e3
DA		 614 struct nlmsghdr *nlh,
615 struct netlink_ext_ack *extack)
76f8f6cb
ND		 616{
617 struct net *net = sock_net(in_skb->sk);
618 struct nlattr *tb[NETCONFA_MAX+1];
619 struct netconfmsg *ncm;
620 struct sk_buff *skb;
621 struct ipv6_devconf *devconf;
622 struct inet6_dev *in6_dev;
623 struct net_device *dev;
624 int ifindex;
625 int err;
626
627 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
c21ef3e3 628 devconf_ipv6_policy, extack);
76f8f6cb
ND		 629 if (err < 0)
630 goto errout;
631
a97eb33f 632 err = -EINVAL;
76f8f6cb
ND		 633 if (!tb[NETCONFA_IFINDEX])
634 goto errout;
635
636 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
637 switch (ifindex) {
638 case NETCONFA_IFINDEX_ALL:
639 devconf = net->ipv6.devconf_all;
640 break;
641 case NETCONFA_IFINDEX_DEFAULT:
642 devconf = net->ipv6.devconf_dflt;
643 break;
644 default:
645 dev = __dev_get_by_index(net, ifindex);
63159f29 646 if (!dev)
76f8f6cb
ND		 647 goto errout;
648 in6_dev = __in6_dev_get(dev);
63159f29 649 if (!in6_dev)
76f8f6cb
ND		 650 goto errout;
651 devconf = &in6_dev->cnf;
652 break;
653 }
654
655 err = -ENOBUFS;
136ba622 656 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
63159f29 657 if (!skb)
76f8f6cb
ND		 658 goto errout;
659
660 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
661 NETLINK_CB(in_skb).portid,
662 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
136ba622 663 NETCONFA_ALL);
76f8f6cb
ND		 664 if (err < 0) {
665 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
666 WARN_ON(err == -EMSGSIZE);
667 kfree_skb(skb);
668 goto errout;
669 }
670 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
671errout:
672 return err;
673}
674
7a674200
ND		 675static int inet6_netconf_dump_devconf(struct sk_buff *skb,
676 struct netlink_callback *cb)
677{
678 struct net *net = sock_net(skb->sk);
679 int h, s_h;
680 int idx, s_idx;
681 struct net_device *dev;
682 struct inet6_dev *idev;
683 struct hlist_head *head;
684
685 s_h = cb->args[0];
686 s_idx = idx = cb->args[1];
687
688 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
689 idx = 0;
690 head = &net->dev_index_head[h];
691 rcu_read_lock();
63998ac2
ND		 692 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
693 net->dev_base_seq;
7a674200
ND		 694 hlist_for_each_entry_rcu(dev, head, index_hlist) {
695 if (idx < s_idx)
696 goto cont;
697 idev = __in6_dev_get(dev);
698 if (!idev)
699 goto cont;
700
701 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
702 &idev->cnf,
703 NETLINK_CB(cb->skb).portid,
704 cb->nlh->nlmsg_seq,
705 RTM_NEWNETCONF,
706 NLM_F_MULTI,
136ba622 707 NETCONFA_ALL) < 0) {
7a674200
ND		 708 rcu_read_unlock();
709 goto done;
710 }
63998ac2 711 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 712cont:
713 idx++;
714 }
715 rcu_read_unlock();
716 }
717 if (h == NETDEV_HASHENTRIES) {
718 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
719 net->ipv6.devconf_all,
720 NETLINK_CB(cb->skb).portid,
721 cb->nlh->nlmsg_seq,
722 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 723 NETCONFA_ALL) < 0)
7a674200
ND		 724 goto done;
725 else
726 h++;
727 }
728 if (h == NETDEV_HASHENTRIES + 1) {
729 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
730 net->ipv6.devconf_dflt,
731 NETLINK_CB(cb->skb).portid,
732 cb->nlh->nlmsg_seq,
733 RTM_NEWNETCONF, NLM_F_MULTI,
136ba622 734 NETCONFA_ALL) < 0)
7a674200
ND		 735 goto done;
736 else
737 h++;
738 }
739done:
740 cb->args[0] = h;
741 cb->args[1] = idx;
742
743 return skb->len;
744}
745
1da177e4
LT		 746#ifdef CONFIG_SYSCTL
747static void dev_forward_change(struct inet6_dev *idev)
748{
749 struct net_device *dev;
750 struct inet6_ifaddr *ifa;
1da177e4
LT		 751
752 if (!idev)
753 return;
754 dev = idev->dev;
0187bdfb
BH		 755 if (idev->cnf.forwarding)
756 dev_disable_lro(dev);
1a940835 757 if (dev->flags & IFF_MULTICAST) {
2c5e8933 758 if (idev->cnf.forwarding) {
f3ee4010 759 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 760 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
761 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
762 } else {
f3ee4010 763 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
2c5e8933
HFS		 764 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
765 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
766 }
1da177e4 767 }
502a2ffd 768
769 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 770 if (ifa->flags&IFA_F_TENTATIVE)
771 continue;
1da177e4
LT		 772 if (idev->cnf.forwarding)
773 addrconf_join_anycast(ifa);
774 else
775 addrconf_leave_anycast(ifa);
776 }
85b3daad
DA		 777 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
778 NETCONFA_FORWARDING,
f3a1bfb1 779 dev->ifindex, &idev->cnf);
1da177e4
LT		 780}
781
782
e186932b 783static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 784{
785 struct net_device *dev;
786 struct inet6_dev *idev;
787
4acd4945 788 for_each_netdev(net, dev) {
1da177e4
LT		 789 idev = __in6_dev_get(dev);
790 if (idev) {
e186932b
PE		 791 int changed = (!idev->cnf.forwarding) ^ (!newf);
792 idev->cnf.forwarding = newf;
1da177e4
LT		 793 if (changed)
794 dev_forward_change(idev);
795 }
1da177e4 796 }
1da177e4 797}
c8fecf22 798
013d97e9 799static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 800{
bff16c2f 801 struct net *net;
013d97e9
FR		 802 int old;
803
804 if (!rtnl_trylock())
805 return restart_syscall();
bff16c2f
PE		 806
807 net = (struct net *)table->extra2;
013d97e9
FR		 808 old = *p;
809 *p = newf;
b325fddb 810
013d97e9 811 if (p == &net->ipv6.devconf_dflt->forwarding) {
f3a1bfb1 812 if ((!newf) ^ (!old))
85b3daad
DA		 813 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
814 NETCONFA_FORWARDING,
f3a1bfb1
ND		 815 NETCONFA_IFINDEX_DEFAULT,
816 net->ipv6.devconf_dflt);
013d97e9
FR		 817 rtnl_unlock();
818 return 0;
88af182e 819 }
c8fecf22 820
e186932b 821 if (p == &net->ipv6.devconf_all->forwarding) {
d26c638c
ND		 822 int old_dflt = net->ipv6.devconf_dflt->forwarding;
823
e186932b 824 net->ipv6.devconf_dflt->forwarding = newf;
d26c638c 825 if ((!newf) ^ (!old_dflt))
85b3daad
DA		 826 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
827 NETCONFA_FORWARDING,
d26c638c
ND		 828 NETCONFA_IFINDEX_DEFAULT,
829 net->ipv6.devconf_dflt);
830
e186932b 831 addrconf_forward_change(net, newf);
f3a1bfb1 832 if ((!newf) ^ (!old))
85b3daad
DA		 833 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
834 NETCONFA_FORWARDING,
f3a1bfb1
ND		 835 NETCONFA_IFINDEX_ALL,
836 net->ipv6.devconf_all);
013d97e9 837 } else if ((!newf) ^ (!old))
c8fecf22 838 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 839 rtnl_unlock();
c8fecf22 840
013d97e9 841 if (newf)
7b4da532 842 rt6_purge_dflt_routers(net);
b325fddb 843 return 1;
c8fecf22 844}
35103d11
AG		 845
846static void addrconf_linkdown_change(struct net *net, __s32 newf)
847{
848 struct net_device *dev;
849 struct inet6_dev *idev;
850
851 for_each_netdev(net, dev) {
852 idev = __in6_dev_get(dev);
853 if (idev) {
854 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
855
856 idev->cnf.ignore_routes_with_linkdown = newf;
857 if (changed)
858 inet6_netconf_notify_devconf(dev_net(dev),
85b3daad 859 RTM_NEWNETCONF,
35103d11
AG		 860 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
861 dev->ifindex,
862 &idev->cnf);
863 }
864 }
865}
866
867static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
868{
869 struct net *net;
870 int old;
871
872 if (!rtnl_trylock())
873 return restart_syscall();
874
875 net = (struct net *)table->extra2;
876 old = *p;
877 *p = newf;
878
879 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
880 if ((!newf) ^ (!old))
881 inet6_netconf_notify_devconf(net,
85b3daad 882 RTM_NEWNETCONF,
35103d11
AG		 883 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
884 NETCONFA_IFINDEX_DEFAULT,
885 net->ipv6.devconf_dflt);
886 rtnl_unlock();
887 return 0;
888 }
889
890 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
891 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
892 addrconf_linkdown_change(net, newf);
893 if ((!newf) ^ (!old))
894 inet6_netconf_notify_devconf(net,
85b3daad 895 RTM_NEWNETCONF,
35103d11
AG		 896 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
897 NETCONFA_IFINDEX_ALL,
898 net->ipv6.devconf_all);
899 }
900 rtnl_unlock();
901
902 return 1;
903}
904
1da177e4
LT		 905#endif
906
5c578aed 907/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 908void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
909{
c2e21293 910 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 911
1da177e4 912#ifdef NET_REFCNT_DEBUG
91df42be 913 pr_debug("%s\n", __func__);
1da177e4
LT		 914#endif
915
916 in6_dev_put(ifp->idev);
917
c15b1cca
HFS		 918 if (cancel_delayed_work(&ifp->dad_work))
919 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
920 ifp);
1da177e4 921
e9d3e084 922 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 923 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 924 return;
925 }
94e187c0 926 ip6_rt_put(ifp->rt);
1da177e4 927
e5785985 928 kfree_rcu(ifp, rcu);
1da177e4
LT		 929}
930
e55ffac6
BH		 931static void
932ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
933{
502a2ffd 934 struct list_head *p;
8a6ce0c0 935 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 936
937 /*
938 * Each device address list is sorted in order of scope -
939 * global before linklocal.
940 */
502a2ffd 941 list_for_each(p, &idev->addr_list) {
942 struct inet6_ifaddr *ifa
943 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 944 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 945 break;
946 }
947
b54c9b98 948 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 949}
950
ddbe5032 951static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 952{
ddbe5032 953 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 954}
955
1da177e4
LT		 956/* On success it returns ifp with increased reference count */
957
958static struct inet6_ifaddr *
3f8f5298
JP		 959ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
960 const struct in6_addr *peer_addr, int pfxlen,
8a226b2c 961 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
1da177e4 962{
df789fe7 963 struct net *net = dev_net(idev->dev);
1da177e4
LT		 964 struct inet6_ifaddr *ifa = NULL;
965 struct rt6_info *rt;
3ad7d246 966 struct in6_validator_info i6vi;
3a88a81d 967 unsigned int hash;
1da177e4 968 int err = 0;
d68b8270
YH		 969 int addr_type = ipv6_addr_type(addr);
970
971 if (addr_type == IPV6_ADDR_ANY ||
972 addr_type & IPV6_ADDR_MULTICAST ||
973 (!(idev->dev->flags & IFF_LOOPBACK) &&
974 addr_type & IPV6_ADDR_LOOPBACK))
975 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 976
8814c4b5 977 rcu_read_lock_bh();
3ad7d246
KJ		 978
979 in6_dev_hold(idev);
980
1da177e4
LT		 981 if (idev->dead) {
982 err = -ENODEV; /*XXX*/
983 goto out2;
984 }
985
56d417b1 986 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 987 err = -EACCES;
988 goto out2;
989 }
990
3ad7d246
KJ		 991 i6vi.i6vi_addr = *addr;
992 i6vi.i6vi_dev = idev;
993 rcu_read_unlock_bh();
994
995 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
996
997 rcu_read_lock_bh();
998 err = notifier_to_errno(err);
999 if (err)
1000 goto out2;
1001
5c578aed 1002 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 1003
1004 /* Ignore adding duplicate addresses on an interface */
c346dca1 1005 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ba3542e1 1006 ADBG("ipv6_add_addr: already assigned\n");
1da177e4
LT		 1007 err = -EEXIST;
1008 goto out;
1009 }
1010
322f74a4 1011 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4 1012
63159f29 1013 if (!ifa) {
ba3542e1 1014 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 1015 err = -ENOBUFS;
1016 goto out;
1017 }
1018
8f031519 1019 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 1020 if (IS_ERR(rt)) {
1021 err = PTR_ERR(rt);
1022 goto out;
1023 }
1024
df789fe7
DF		 1025 if (net->ipv6.devconf_all->disable_policy ||
1026 idev->cnf.disable_policy)
1027 rt->dst.flags |= DST_NOPOLICY;
1028
bba24896
JP		 1029 neigh_parms_data_state_setall(idev->nd_parms);
1030
4e3fd7a0 1031 ifa->addr = *addr;
3f8f5298
JP		 1032 if (peer_addr)
1033 ifa->peer_addr = *peer_addr;
1da177e4
LT		 1034
1035 spin_lock_init(&ifa->lock);
c15b1cca 1036 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 1037 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 1038 ifa->scope = scope;
1039 ifa->prefix_len = pfxlen;
66eb9f86
MB		 1040 ifa->flags = flags;
1041 /* No need to add the TENTATIVE flag for addresses with NODAD */
1042 if (!(flags & IFA_F_NODAD))
1043 ifa->flags |= IFA_F_TENTATIVE;
8a226b2c
JB		 1044 ifa->valid_lft = valid_lft;
1045 ifa->prefered_lft = prefered_lft;
1da177e4 1046 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 1047 ifa->tokenized = false;
1da177e4 1048
57f5f544
KF		 1049 ifa->rt = rt;
1050
1da177e4 1051 ifa->idev = idev;
1da177e4 1052 /* For caller */
271201c0 1053 refcount_set(&ifa->refcnt, 1);
1da177e4
LT		 1054
1055 /* Add to big hash table */
ddbe5032 1056 hash = inet6_addr_hash(addr);
1da177e4 1057
5c578aed 1058 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 1059 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 1060
1061 write_lock(&idev->lock);
1062 /* Add to inet6_dev unicast addr list. */
e55ffac6 1063 ipv6_link_dev_addr(idev, ifa);
1da177e4 1064
1da177e4 1065 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 1066 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 1067 in6_ifa_hold(ifa);
1068 }
1da177e4 1069
1da177e4
LT		 1070 in6_ifa_hold(ifa);
1071 write_unlock(&idev->lock);
1072out2:
8814c4b5 1073 rcu_read_unlock_bh();
1da177e4 1074
fd92833a 1075 if (likely(err == 0))
f88c91dd 1076 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 1077 else {
1078 kfree(ifa);
3ad7d246 1079 in6_dev_put(idev);
1da177e4
LT		 1080 ifa = ERR_PTR(err);
1081 }
1082
1083 return ifa;
1084out:
5c578aed 1085 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 1086 goto out2;
1087}
1088
5b84efec
TH		 1089enum cleanup_prefix_rt_t {
1090 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1091 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1092 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1093};
1094
1095/*
1096 * Check, whether the prefix for ifp would still need a prefix route
1097 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1098 * constants.
1099 *
1100 * 1) we don't purge prefix if address was not permanent.
1101 * prefix is managed by its own lifetime.
1102 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1103 * 3) if there are no addresses, delete prefix.
1104 * 4) if there are still other permanent address(es),
1105 * corresponding prefix is still permanent.
1106 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1107 * don't purge the prefix, assume user space is managing it.
1108 * 6) otherwise, update prefix lifetime to the
1109 * longest valid lifetime among the corresponding
1110 * addresses on the device.
1111 * Note: subsequent RA will update lifetime.
1112 **/
1113static enum cleanup_prefix_rt_t
1114check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1115{
1116 struct inet6_ifaddr *ifa;
1117 struct inet6_dev *idev = ifp->idev;
1118 unsigned long lifetime;
1119 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1120
1121 *expires = jiffies;
1122
1123 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1124 if (ifa == ifp)
1125 continue;
1126 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1127 ifp->prefix_len))
1128 continue;
1129 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1130 return CLEANUP_PREFIX_RT_NOP;
1131
1132 action = CLEANUP_PREFIX_RT_EXPIRE;
1133
1134 spin_lock(&ifa->lock);
1135
1136 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1137 /*
1138 * Note: Because this address is
1139 * not permanent, lifetime <
1140 * LONG_MAX / HZ here.
1141 */
1142 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1143 *expires = ifa->tstamp + lifetime * HZ;
1144 spin_unlock(&ifa->lock);
1145 }
1146
1147 return action;
1148}
1149
1150static void
1151cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1152{
1153 struct rt6_info *rt;
1154
1155 rt = addrconf_get_prefix_route(&ifp->addr,
1156 ifp->prefix_len,
1157 ifp->idev->dev,
1158 0, RTF_GATEWAY | RTF_DEFAULT);
1159 if (rt) {
1160 if (del_rt)
1161 ip6_del_rt(rt);
1162 else {
1163 if (!(rt->rt6i_flags & RTF_EXPIRES))
1164 rt6_set_expires(rt, expires);
1165 ip6_rt_put(rt);
1166 }
1167 }
1168}
1169
1170
1da177e4
LT		 1171/* This function wants to get referenced ifp and releases it before return */
1172
1173static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1174{
4c5ff6a6 1175 int state;
5b84efec
TH		 1176 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1177 unsigned long expires;
1da177e4 1178
c15b1cca
HFS		 1179 ASSERT_RTNL();
1180
8e8e676d 1181 spin_lock_bh(&ifp->lock);
4c5ff6a6 1182 state = ifp->state;
e9d3e084 1183 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1184 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1185
1186 if (state == INET6_IFADDR_STATE_DEAD)
1187 goto out;
1da177e4 1188
5c578aed 1189 spin_lock_bh(&addrconf_hash_lock);
1190 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1191 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1192
5b84efec 1193 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1194
1da177e4 1195 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1196 list_del(&ifp->tmp_list);
1197 if (ifp->ifpub) {
1198 in6_ifa_put(ifp->ifpub);
1199 ifp->ifpub = NULL;
1da177e4 1200 }
372e6c8f 1201 __in6_ifa_put(ifp);
1da177e4 1202 }
1da177e4 1203
5b84efec
TH		 1204 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1205 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1206
5b84efec
TH		 1207 list_del_init(&ifp->if_list);
1208 __in6_ifa_put(ifp);
1209
1210 write_unlock_bh(&ifp->idev->lock);
1da177e4 1211
c15b1cca 1212 addrconf_del_dad_work(ifp);
b2238566 1213
1da177e4
LT		 1214 ipv6_ifa_notify(RTM_DELADDR, ifp);
1215
f88c91dd 1216 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1217
5b84efec
TH		 1218 if (action != CLEANUP_PREFIX_RT_NOP) {
1219 cleanup_prefix_route(ifp, expires,
1220 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1221 }
1222
c3968a85
DW		 1223 /* clean up prefsrc entries */
1224 rt6_remove_prefsrc(ifp);
4c5ff6a6 1225out:
1da177e4
LT		 1226 in6_ifa_put(ifp);
1227}
1228
1da177e4
LT		 1229static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1230{
1231 struct inet6_dev *idev = ifp->idev;
1232 struct in6_addr addr, *tmpaddr;
76f793e3 1233 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1234 unsigned long regen_advance;
1da177e4
LT		 1235 int tmp_plen;
1236 int ret = 0;
95c385b4 1237 u32 addr_flags;
76f793e3 1238 unsigned long now = jiffies;
76506a98 1239 long max_desync_factor;
7aa8e63f 1240 s32 cnf_temp_preferred_lft;
1da177e4 1241
53bd6749 1242 write_lock_bh(&idev->lock);
1da177e4
LT		 1243 if (ift) {
1244 spin_lock_bh(&ift->lock);
1245 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1246 spin_unlock_bh(&ift->lock);
1247 tmpaddr = &addr;
1248 } else {
1249 tmpaddr = NULL;
1250 }
1251retry:
1252 in6_dev_hold(idev);
1253 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1254 write_unlock_bh(&idev->lock);
f3213831 1255 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1256 in6_dev_put(idev);
1257 ret = -1;
1258 goto out;
1259 }
1260 spin_lock_bh(&ifp->lock);
1261 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1262 idev->cnf.use_tempaddr = -1; /*XXX*/
1263 spin_unlock_bh(&ifp->lock);
53bd6749 1264 write_unlock_bh(&idev->lock);
f3213831
JP		 1265 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1266 __func__);
1da177e4
LT		 1267 in6_dev_put(idev);
1268 ret = -1;
1269 goto out;
1270 }
1271 in6_ifa_hold(ifp);
1272 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
9d6280da 1273 ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1274 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1275 age = (now - ifp->tstamp) / HZ;
76506a98
JB		 1276
1277 regen_advance = idev->cnf.regen_max_retry *
1278 idev->cnf.dad_transmits *
1279 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1280
1281 /* recalculate max_desync_factor each time and update
1282 * idev->desync_factor if it's larger
1283 */
7aa8e63f 1284 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
76506a98
JB		 1285 max_desync_factor = min_t(__u32,
1286 idev->cnf.max_desync_factor,
7aa8e63f 1287 cnf_temp_preferred_lft - regen_advance);
76506a98
JB		 1288
1289 if (unlikely(idev->desync_factor > max_desync_factor)) {
1290 if (max_desync_factor > 0) {
1291 get_random_bytes(&idev->desync_factor,
1292 sizeof(idev->desync_factor));
1293 idev->desync_factor %= max_desync_factor;
1294 } else {
1295 idev->desync_factor = 0;
1296 }
1297 }
1298
1da177e4
LT		 1299 tmp_valid_lft = min_t(__u32,
1300 ifp->valid_lft,
7a876b0e 1301 idev->cnf.temp_valid_lft + age);
7aa8e63f 1302 tmp_prefered_lft = cnf_temp_preferred_lft + age -
76506a98 1303 idev->desync_factor;
76506a98 1304 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1da177e4 1305 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1306 tmp_tstamp = ifp->tstamp;
1307 spin_unlock_bh(&ifp->lock);
1308
53bd6749 1309 write_unlock_bh(&idev->lock);
95c385b4 1310
eac55bf9
BB		 1311 /* A temporary address is created only if this calculated Preferred
1312 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1313 * an implementation must not create a temporary address with a zero
1314 * Preferred Lifetime.
ecab6701
HK		 1315 * Use age calculation as in addrconf_verify to avoid unnecessary
1316 * temporary addresses being generated.
eac55bf9 1317 */
ecab6701
HK		 1318 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1319 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1320 in6_ifa_put(ifp);
1321 in6_dev_put(idev);
1322 ret = -1;
1323 goto out;
1324 }
1325
95c385b4
NH		 1326 addr_flags = IFA_F_TEMPORARY;
1327 /* set in addrconf_prefix_rcv() */
1328 if (ifp->flags & IFA_F_OPTIMISTIC)
1329 addr_flags |= IFA_F_OPTIMISTIC;
1330
4b08a8f1
HFS		 1331 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1332 ipv6_addr_scope(&addr), addr_flags,
1333 tmp_valid_lft, tmp_prefered_lft);
1334 if (IS_ERR(ift)) {
1da177e4
LT		 1335 in6_ifa_put(ifp);
1336 in6_dev_put(idev);
f3213831 1337 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1338 tmpaddr = &addr;
53bd6749 1339 write_lock_bh(&idev->lock);
1da177e4
LT		 1340 goto retry;
1341 }
1342
1343 spin_lock_bh(&ift->lock);
1344 ift->ifpub = ifp;
76f793e3 1345 ift->cstamp = now;
1da177e4
LT		 1346 ift->tstamp = tmp_tstamp;
1347 spin_unlock_bh(&ift->lock);
1348
cf22f9a2 1349 addrconf_dad_start(ift);
1da177e4
LT		 1350 in6_ifa_put(ift);
1351 in6_dev_put(idev);
1352out:
1353 return ret;
1354}
1da177e4
LT		 1355
1356/*
072047e4 1357 * Choose an appropriate source address (RFC3484)
1da177e4 1358 */
a9b05723
YH		 1359enum {
1360 IPV6_SADDR_RULE_INIT = 0,
1361 IPV6_SADDR_RULE_LOCAL,
1362 IPV6_SADDR_RULE_SCOPE,
1363 IPV6_SADDR_RULE_PREFERRED,
1364#ifdef CONFIG_IPV6_MIP6
1365 IPV6_SADDR_RULE_HOA,
1366#endif
1367 IPV6_SADDR_RULE_OIF,
1368 IPV6_SADDR_RULE_LABEL,
a9b05723 1369 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1370 IPV6_SADDR_RULE_ORCHID,
1371 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1372#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1373 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1374#endif
a9b05723
YH		 1375 IPV6_SADDR_RULE_MAX
1376};
1377
072047e4 1378struct ipv6_saddr_score {
a9b05723
YH		 1379 int rule;
1380 int addr_type;
1381 struct inet6_ifaddr *ifa;
1382 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1383 int scopedist;
1384 int matchlen;
072047e4
YH		 1385};
1386
a9b05723 1387struct ipv6_saddr_dst {
9acd9f3a 1388 const struct in6_addr *addr;
a9b05723
YH		 1389 int ifindex;
1390 int scope;
1391 int label;
7cbca67c 1392 unsigned int prefs;
a9b05723 1393};
072047e4 1394
b6f99a21 1395static inline int ipv6_saddr_preferred(int type)
1da177e4 1396{
45bb0060 1397 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1398 return 1;
1399 return 0;
1da177e4
LT		 1400}
1401
7fd2561e
EK		 1402static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1403{
1404#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1405 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1406#else
1407 return false;
1408#endif
1409}
1410
3de23255
BT		 1411static int ipv6_get_saddr_eval(struct net *net,
1412 struct ipv6_saddr_score *score,
a9b05723
YH		 1413 struct ipv6_saddr_dst *dst,
1414 int i)
1415{
1416 int ret;
1417
1418 if (i <= score->rule) {
1419 switch (i) {
1420 case IPV6_SADDR_RULE_SCOPE:
1421 ret = score->scopedist;
1422 break;
1423 case IPV6_SADDR_RULE_PREFIX:
1424 ret = score->matchlen;
1425 break;
1426 default:
1427 ret = !!test_bit(i, score->scorebits);
1428 }
1429 goto out;
1430 }
1431
1432 switch (i) {
1433 case IPV6_SADDR_RULE_INIT:
1434 /* Rule 0: remember if hiscore is not ready yet */
1435 ret = !!score->ifa;
1436 break;
1437 case IPV6_SADDR_RULE_LOCAL:
1438 /* Rule 1: Prefer same address */
1439 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1440 break;
1441 case IPV6_SADDR_RULE_SCOPE:
1442 /* Rule 2: Prefer appropriate scope
1443 *
1444 * ret
1445 * ^
1446 * -1 | d 15
1447 * ---+--+-+---> scope
1448 * |
1449 * | d is scope of the destination.
1450 * B-d | \
1451 * | \ <- smaller scope is better if
db9c7c39 1452 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1453 * | ret = B - scope (-1 <= scope >= d <= 15).
1454 * d-C-1 | /
1455 * |/ <- greater is better
1456 * -C / if scope is not enough for destination.
1457 * /| ret = scope - C (-1 <= d < scope <= 15).
1458 *
1459 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1460 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1461 * Assume B = 0 and we get C > 29.
1462 */
1463 ret = __ipv6_addr_src_scope(score->addr_type);
1464 if (ret >= dst->scope)
1465 ret = -ret;
1466 else
1467 ret -= 128; /* 30 is enough */
1468 score->scopedist = ret;
1469 break;
1470 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1471 {
a9b05723 1472 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1473 u8 avoid = IFA_F_DEPRECATED;
1474
1475 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1476 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1477 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1478 !(score->ifa->flags & avoid);
a9b05723 1479 break;
7fd2561e 1480 }
a9b05723
YH		 1481#ifdef CONFIG_IPV6_MIP6
1482 case IPV6_SADDR_RULE_HOA:
7cbca67c 1483 {
a9b05723 1484 /* Rule 4: Prefer home address */
7cbca67c
YH		 1485 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1486 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1487 break;
7cbca67c 1488 }
a9b05723
YH		 1489#endif
1490 case IPV6_SADDR_RULE_OIF:
1491 /* Rule 5: Prefer outgoing interface */
1492 ret = (!dst->ifindex ||
1493 dst->ifindex == score->ifa->idev->dev->ifindex);
1494 break;
1495 case IPV6_SADDR_RULE_LABEL:
1496 /* Rule 6: Prefer matching label */
3de23255
BT		 1497 ret = ipv6_addr_label(net,
1498 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1499 score->ifa->idev->dev->ifindex) == dst->label;
1500 break;
a9b05723 1501 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1502 {
a9b05723 1503 /* Rule 7: Prefer public address
25985edc 1504 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1505 */
7cbca67c
YH		 1506 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1507 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1508 score->ifa->idev->cnf.use_tempaddr >= 2;
1509 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1510 break;
7cbca67c 1511 }
a9b05723
YH		 1512 case IPV6_SADDR_RULE_ORCHID:
1513 /* Rule 8-: Prefer ORCHID vs ORCHID or
1514 * non-ORCHID vs non-ORCHID
1515 */
1516 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1517 ipv6_addr_orchid(dst->addr));
1518 break;
1519 case IPV6_SADDR_RULE_PREFIX:
1520 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1521 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1522 if (ret > score->ifa->prefix_len)
1523 ret = score->ifa->prefix_len;
1524 score->matchlen = ret;
a9b05723 1525 break;
7fd2561e
EK		 1526#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1527 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1528 /* Optimistic addresses still have lower precedence than other
1529 * preferred addresses.
1530 */
1531 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1532 break;
1533#endif
a9b05723
YH		 1534 default:
1535 ret = 0;
1536 }
1537
1538 if (ret)
1539 __set_bit(i, score->scorebits);
1540 score->rule = i;
1541out:
1542 return ret;
1543}
1544
c0b8da1e
YH		 1545static int __ipv6_dev_get_saddr(struct net *net,
1546 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1547 struct inet6_dev *idev,
1548 struct ipv6_saddr_score *scores,
1549 int hiscore_idx)
9131f3de 1550{
c0b8da1e 1551 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de
YH		 1552
1553 read_lock_bh(&idev->lock);
1554 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1555 int i;
1556
1557 /*
1558 * - Tentative Address (RFC2462 section 5.4)
1559 * - A tentative address is not considered
1560 * "assigned to an interface" in the traditional
1561 * sense, unless it is also flagged as optimistic.
1562 * - Candidate Source Address (section 4)
1563 * - In any case, anycast addresses, multicast
1564 * addresses, and the unspecified address MUST
1565 * NOT be included in a candidate set.
1566 */
1567 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1568 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1569 continue;
1570
1571 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1572
1573 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1574 score->addr_type & IPV6_ADDR_MULTICAST)) {
1575 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1576 idev->dev->name);
1577 continue;
1578 }
1579
1580 score->rule = -1;
1581 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1582
1583 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1584 int minihiscore, miniscore;
1585
1586 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1587 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1588
1589 if (minihiscore > miniscore) {
1590 if (i == IPV6_SADDR_RULE_SCOPE &&
1591 score->scopedist > 0) {
1592 /*
1593 * special case:
1594 * each remaining entry
1595 * has too small (not enough)
1596 * scope, because ifa entries
1597 * are sorted by their scope
1598 * values.
1599 */
1600 goto out;
1601 }
1602 break;
1603 } else if (minihiscore < miniscore) {
1604 if (hiscore->ifa)
1605 in6_ifa_put(hiscore->ifa);
1606
1607 in6_ifa_hold(score->ifa);
1608
1609 swap(hiscore, score);
c0b8da1e 1610 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1611
1612 /* restore our iterator */
1613 score->ifa = hiscore->ifa;
1614
1615 break;
1616 }
1617 }
1618 }
1619out:
1620 read_unlock_bh(&idev->lock);
c0b8da1e 1621 return hiscore_idx;
9131f3de
YH		 1622}
1623
afbac601
DA		 1624static int ipv6_get_saddr_master(struct net *net,
1625 const struct net_device *dst_dev,
1626 const struct net_device *master,
1627 struct ipv6_saddr_dst *dst,
1628 struct ipv6_saddr_score *scores,
1629 int hiscore_idx)
1630{
1631 struct inet6_dev *idev;
1632
1633 idev = __in6_dev_get(dst_dev);
1634 if (idev)
1635 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1636 scores, hiscore_idx);
1637
1638 idev = __in6_dev_get(master);
1639 if (idev)
1640 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1641 scores, hiscore_idx);
1642
1643 return hiscore_idx;
1644}
1645
b3f644fc 1646int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1647 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1648 struct in6_addr *saddr)
1da177e4 1649{
c0b8da1e 1650 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1651 struct ipv6_saddr_dst dst;
9131f3de 1652 struct inet6_dev *idev;
072047e4 1653 struct net_device *dev;
a9b05723 1654 int dst_type;
9131f3de 1655 bool use_oif_addr = false;
c0b8da1e 1656 int hiscore_idx = 0;
1da177e4 1657
a9b05723
YH		 1658 dst_type = __ipv6_addr_type(daddr);
1659 dst.addr = daddr;
1660 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1661 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1662 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1663 dst.prefs = prefs;
a9b05723 1664
c0b8da1e
YH		 1665 scores[hiscore_idx].rule = -1;
1666 scores[hiscore_idx].ifa = NULL;
1da177e4 1667
8814c4b5 1668 rcu_read_lock();
1da177e4 1669
9131f3de
YH		 1670 /* Candidate Source Address (section 4)
1671 * - multicast and link-local destination address,
1672 * the set of candidate source address MUST only
1673 * include addresses assigned to interfaces
1674 * belonging to the same link as the outgoing
1675 * interface.
1676 * (- For site-local destination addresses, the
1677 * set of candidate source addresses MUST only
1678 * include addresses assigned to interfaces
1679 * belonging to the same site as the outgoing
1680 * interface.)
3985e8a3
EK		 1681 * - "It is RECOMMENDED that the candidate source addresses
1682 * be the set of unicast addresses assigned to the
1683 * interface that will be used to send to the destination
1684 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1685 */
1686 if (dst_dev) {
3985e8a3 1687 idev = __in6_dev_get(dst_dev);
9131f3de 1688 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1689 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1690 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1691 use_oif_addr = true;
1692 }
1693 }
a9b05723 1694
9131f3de 1695 if (use_oif_addr) {
c0b8da1e 1696 if (idev)
c15df306 1697 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de 1698 } else {
afbac601
DA		 1699 const struct net_device *master;
1700 int master_idx = 0;
1701
1702 /* if dst_dev exists and is enslaved to an L3 device, then
1703 * prefer addresses from dst_dev and then the master over
1704 * any other enslaved devices in the L3 domain.
1705 */
1706 master = l3mdev_master_dev_rcu(dst_dev);
1707 if (master) {
1708 master_idx = master->ifindex;
1709
1710 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1711 master, &dst,
1712 scores, hiscore_idx);
1713
1714 if (scores[hiscore_idx].ifa)
1715 goto out;
1716 }
1717
9131f3de 1718 for_each_netdev_rcu(net, dev) {
afbac601
DA		 1719 /* only consider addresses on devices in the
1720 * same L3 domain
1721 */
1722 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1723 continue;
9131f3de
YH		 1724 idev = __in6_dev_get(dev);
1725 if (!idev)
072047e4 1726 continue;
c15df306 1727 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1728 }
1729 }
afbac601
DA		 1730
1731out:
8814c4b5 1732 rcu_read_unlock();
1da177e4 1733
c0b8da1e 1734 hiscore = &scores[hiscore_idx];
a9b05723 1735 if (!hiscore->ifa)
072047e4 1736 return -EADDRNOTAVAIL;
1ab1457c 1737
4e3fd7a0 1738 *saddr = hiscore->ifa->addr;
a9b05723 1739 in6_ifa_put(hiscore->ifa);
072047e4 1740 return 0;
1da177e4 1741}
5e5f3f0f 1742EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1743
8965779d 1744int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1745 u32 banned_flags)
b7b1bfce
HFS		 1746{
1747 struct inet6_ifaddr *ifp;
1748 int err = -EADDRNOTAVAIL;
1749
602582ca
HFS		 1750 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1751 if (ifp->scope > IFA_LINK)
1752 break;
b7b1bfce
HFS		 1753 if (ifp->scope == IFA_LINK &&
1754 !(ifp->flags & banned_flags)) {
1755 *addr = ifp->addr;
1756 err = 0;
1757 break;
1758 }
1759 }
1760 return err;
1761}
1762
95c385b4 1763int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1764 u32 banned_flags)
1da177e4
LT		 1765{
1766 struct inet6_dev *idev;
1767 int err = -EADDRNOTAVAIL;
1768
8814c4b5 1769 rcu_read_lock();
e21e8467
SH		 1770 idev = __in6_dev_get(dev);
1771 if (idev) {
1da177e4 1772 read_lock_bh(&idev->lock);
b7b1bfce 1773 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1774 read_unlock_bh(&idev->lock);
1775 }
8814c4b5 1776 rcu_read_unlock();
1da177e4
LT		 1777 return err;
1778}
1779
1780static int ipv6_count_addresses(struct inet6_dev *idev)
1781{
1782 int cnt = 0;
1783 struct inet6_ifaddr *ifp;
1784
1785 read_lock_bh(&idev->lock);
502a2ffd 1786 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1787 cnt++;
1788 read_unlock_bh(&idev->lock);
1789 return cnt;
1790}
1791
b71d1d42 1792int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1793 const struct net_device *dev, int strict)
c58da4c6
EK		 1794{
1795 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1796}
1797EXPORT_SYMBOL(ipv6_chk_addr);
1798
1799int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1800 const struct net_device *dev, int strict,
1801 u32 banned_flags)
1da177e4 1802{
eedf042a 1803 struct inet6_ifaddr *ifp;
ddbe5032 1804 unsigned int hash = inet6_addr_hash(addr);
c58da4c6 1805 u32 ifp_flags;
1da177e4 1806
5c578aed 1807 rcu_read_lock_bh();
b67bfe0d 1808 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1809 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1810 continue;
c58da4c6
EK		 1811 /* Decouple optimistic from tentative for evaluation here.
1812 * Ban optimistic addresses explicitly, when required.
1813 */
1814 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1815 ? (ifp->flags&~IFA_F_TENTATIVE)
1816 : ifp->flags;
1da177e4 1817 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1818 !(ifp_flags&banned_flags) &&
63159f29 1819 (!dev || ifp->idev->dev == dev ||
eedf042a
SH		 1820 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1821 rcu_read_unlock_bh();
1822 return 1;
1da177e4
LT		 1823 }
1824 }
5c578aed 1825
eedf042a
SH		 1826 rcu_read_unlock_bh();
1827 return 0;
1da177e4 1828}
c58da4c6 1829EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1830
3e81c6da
DM		 1831static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1832 struct net_device *dev)
1da177e4 1833{
ddbe5032 1834 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1835 struct inet6_ifaddr *ifp;
1da177e4 1836
b67bfe0d 1837 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1838 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1839 continue;
1da177e4 1840 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1841 if (!dev || ifp->idev->dev == dev)
3e81c6da 1842 return true;
1da177e4
LT		 1843 }
1844 }
3e81c6da 1845 return false;
1da177e4
LT		 1846}
1847
7df37ff3
CB		 1848/* Compares an address/prefix_len with addresses on device @dev.
1849 * If one is found it returns true.
1850 */
1851bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1852 const unsigned int prefix_len, struct net_device *dev)
1853{
1854 struct inet6_dev *idev;
1855 struct inet6_ifaddr *ifa;
1856 bool ret = false;
1857
1858 rcu_read_lock();
1859 idev = __in6_dev_get(dev);
1860 if (idev) {
1861 read_lock_bh(&idev->lock);
1862 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1863 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1864 if (ret)
1865 break;
1866 }
1867 read_unlock_bh(&idev->lock);
1868 }
1869 rcu_read_unlock();
1870
1871 return ret;
1872}
1873EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1874
b71d1d42 1875int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1876{
1877 struct inet6_dev *idev;
1878 struct inet6_ifaddr *ifa;
1879 int onlink;
1880
1881 onlink = 0;
1882 rcu_read_lock();
1883 idev = __in6_dev_get(dev);
1884 if (idev) {
1885 read_lock_bh(&idev->lock);
502a2ffd 1886 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1887 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1888 ifa->prefix_len);
1889 if (onlink)
1890 break;
1891 }
1892 read_unlock_bh(&idev->lock);
1893 }
1894 rcu_read_unlock();
1895 return onlink;
1896}
52eeeb84
YH		 1897EXPORT_SYMBOL(ipv6_chk_prefix);
1898
9acd9f3a 1899struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1900 struct net_device *dev, int strict)
1da177e4 1901{
b79d1d54 1902 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1903 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1904
5c578aed 1905 rcu_read_lock_bh();
b67bfe0d 1906 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1907 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1908 continue;
1da177e4 1909 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1910 if (!dev || ifp->idev->dev == dev ||
1da177e4 1911 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1912 result = ifp;
1da177e4
LT		 1913 in6_ifa_hold(ifp);
1914 break;
1915 }
1916 }
1917 }
5c578aed 1918 rcu_read_unlock_bh();
1da177e4 1919
b79d1d54 1920 return result;
1da177e4
LT		 1921}
1922
1da177e4
LT		 1923/* Gets referenced address, destroys ifaddr */
1924
cc411d0b 1925static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1926{
3d171f39
LR		 1927 if (dad_failed)
1928 ifp->flags |= IFA_F_DADFAILED;
1929
ec8add2a 1930 if (ifp->flags&IFA_F_TEMPORARY) {
1da177e4
LT		 1931 struct inet6_ifaddr *ifpub;
1932 spin_lock_bh(&ifp->lock);
1933 ifpub = ifp->ifpub;
1934 if (ifpub) {
1935 in6_ifa_hold(ifpub);
1936 spin_unlock_bh(&ifp->lock);
1937 ipv6_create_tempaddr(ifpub, ifp);
1938 in6_ifa_put(ifpub);
1939 } else {
1940 spin_unlock_bh(&ifp->lock);
1941 }
1942 ipv6_del_addr(ifp);
ec8add2a
SD		 1943 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
1944 spin_lock_bh(&ifp->lock);
1945 addrconf_del_dad_work(ifp);
1946 ifp->flags |= IFA_F_TENTATIVE;
1947 spin_unlock_bh(&ifp->lock);
1948 if (dad_failed)
1949 ipv6_ifa_notify(0, ifp);
1950 in6_ifa_put(ifp);
c15b1cca 1951 } else {
1da177e4 1952 ipv6_del_addr(ifp);
c15b1cca 1953 }
1da177e4
LT		 1954}
1955
f2344a13
HX		 1956static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1957{
1958 int err = -ENOENT;
1959
8e8e676d 1960 spin_lock_bh(&ifp->lock);
f2344a13
HX		 1961 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1962 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1963 err = 0;
1964 }
8e8e676d 1965 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 1966
1967 return err;
1968}
1969
3c21edbd
YH		 1970void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1971{
1b34be74 1972 struct inet6_dev *idev = ifp->idev;
1855b7c3 1973 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 1974
853dc2e0
UB		 1975 if (addrconf_dad_end(ifp)) {
1976 in6_ifa_put(ifp);
f2344a13 1977 return;
853dc2e0 1978 }
f2344a13 1979
e87cc472
JP		 1980 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1981 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1982
5f40ef77
HFS		 1983 spin_lock_bh(&ifp->lock);
1984
1985 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1986 int scope = ifp->scope;
1987 u32 flags = ifp->flags;
1988 struct in6_addr new_addr;
1989 struct inet6_ifaddr *ifp2;
1990 u32 valid_lft, preferred_lft;
1991 int pfxlen = ifp->prefix_len;
5f40ef77
HFS		 1992 int retries = ifp->stable_privacy_retry + 1;
1993
1855b7c3 1994 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 1995 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1996 ifp->idev->dev->name);
1997 goto errdad;
1998 }
1999
2000 new_addr = ifp->addr;
2001 if (ipv6_generate_stable_address(&new_addr, retries,
2002 idev))
2003 goto errdad;
2004
2005 valid_lft = ifp->valid_lft;
2006 preferred_lft = ifp->prefered_lft;
2007
2008 spin_unlock_bh(&ifp->lock);
1b34be74 2009
5f40ef77
HFS		 2010 if (idev->cnf.max_addresses &&
2011 ipv6_count_addresses(idev) >=
2012 idev->cnf.max_addresses)
2013 goto lock_errdad;
2014
2015 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2016 ifp->idev->dev->name);
2017
2018 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
2019 scope, flags, valid_lft,
2020 preferred_lft);
2021 if (IS_ERR(ifp2))
2022 goto lock_errdad;
2023
2024 spin_lock_bh(&ifp2->lock);
2025 ifp2->stable_privacy_retry = retries;
2026 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2027 spin_unlock_bh(&ifp2->lock);
2028
1855b7c3 2029 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 2030 in6_ifa_put(ifp2);
2031lock_errdad:
2032 spin_lock_bh(&ifp->lock);
1b34be74
YH		 2033 }
2034
5f40ef77 2035errdad:
c15b1cca
HFS		 2036 /* transition from _POSTDAD to _ERRDAD */
2037 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 2038 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 2039
2040 addrconf_mod_dad_work(ifp, 0);
751eb6b6 2041 in6_ifa_put(ifp);
3c21edbd 2042}
1da177e4 2043
a9ed4a29
SD		 2044/* Join to solicited addr multicast group.
2045 * caller must hold RTNL */
b71d1d42 2046void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 2047{
2048 struct in6_addr maddr;
2049
2050 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2051 return;
2052
2053 addrconf_addr_solict_mult(addr, &maddr);
2054 ipv6_dev_mc_inc(dev, &maddr);
2055}
2056
a9ed4a29 2057/* caller must hold RTNL */
b71d1d42 2058void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 2059{
2060 struct in6_addr maddr;
2061
2062 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2063 return;
2064
2065 addrconf_addr_solict_mult(addr, &maddr);
2066 __ipv6_dev_mc_dec(idev, &maddr);
2067}
2068
a9ed4a29 2069/* caller must hold RTNL */
20380731 2070static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2071{
2072 struct in6_addr addr;
c15b1cca 2073
88ad3149 2074 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 2075 return;
1da177e4
LT		 2076 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2077 if (ipv6_addr_any(&addr))
2078 return;
013b4d90 2079 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 2080}
2081
a9ed4a29 2082/* caller must hold RTNL */
20380731 2083static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2084{
2085 struct in6_addr addr;
c15b1cca 2086
88ad3149 2087 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 2088 return;
1da177e4
LT		 2089 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2090 if (ipv6_addr_any(&addr))
2091 return;
2092 __ipv6_dev_ac_dec(ifp->idev, &addr);
2093}
2094
8a7a4b47 2095static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
06a4c1c5 2096{
8a7a4b47
AA		 2097 switch (dev->addr_len) {
2098 case ETH_ALEN:
9dae2e03
LAD		 2099 memcpy(eui, dev->dev_addr, 3);
2100 eui[3] = 0xFF;
2101 eui[4] = 0xFE;
2102 memcpy(eui + 5, dev->dev_addr + 3, 3);
2103 break;
8a7a4b47
AA		 2104 case EUI64_ADDR_LEN:
2105 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2106 eui[0] ^= 2;
2107 break;
2108 default:
06a4c1c5 2109 return -1;
8a7a4b47
AA		 2110 }
2111
06a4c1c5 2112 return 0;
2113}
2114
cb6bf355
YH		 2115static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2116{
2117 union fwnet_hwaddr *ha;
2118
2119 if (dev->addr_len != FWNET_ALEN)
2120 return -1;
2121
2122 ha = (union fwnet_hwaddr *)dev->dev_addr;
2123
2124 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2125 eui[0] ^= 2;
2126 return 0;
2127}
2128
073a8e0e
YH		 2129static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2130{
2131 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2132 if (dev->addr_len != ARCNET_ALEN)
2133 return -1;
2134 memset(eui, 0, 7);
8e5e8f30 2135 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 2136 return 0;
2137}
2138
2139static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2140{
2141 if (dev->addr_len != INFINIBAND_ALEN)
2142 return -1;
2143 memcpy(eui, dev->dev_addr + 12, 8);
2144 eui[0] |= 2;
2145 return 0;
2146}
2147
c61393ea 2148static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2149{
9af28511
SH		 2150 if (addr == 0)
2151 return -1;
dfd982ba
YH		 2152 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2153 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2154 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2155 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2156 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2157 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2158 eui[1] = 0;
2159 eui[2] = 0x5E;
2160 eui[3] = 0xFE;
2161 memcpy(eui + 4, &addr, 4);
2162 return 0;
2163}
dfd982ba
YH		 2164
2165static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2166{
2167 if (dev->priv_flags & IFF_ISATAP)
2168 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2169 return -1;
2170}
2171
aee80b54 2172static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2173{
2174 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2175}
2176
e837735e
ND		 2177static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2178{
2179 memcpy(eui, dev->perm_addr, 3);
2180 memcpy(eui + 5, dev->perm_addr + 3, 3);
2181 eui[3] = 0xFF;
2182 eui[4] = 0xFE;
2183 eui[0] ^= 2;
2184 return 0;
2185}
2186
1da177e4
LT		 2187static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2188{
2189 switch (dev->type) {
2190 case ARPHRD_ETHER:
2191 case ARPHRD_FDDI:
073a8e0e 2192 return addrconf_ifid_eui48(eui, dev);
1da177e4 2193 case ARPHRD_ARCNET:
073a8e0e 2194 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2195 case ARPHRD_INFINIBAND:
073a8e0e 2196 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2197 case ARPHRD_SIT:
dfd982ba 2198 return addrconf_ifid_sit(eui, dev);
aee80b54 2199 case ARPHRD_IPGRE:
45ce0fd1 2200 case ARPHRD_TUNNEL:
aee80b54 2201 return addrconf_ifid_gre(eui, dev);
e74bccb8 2202 case ARPHRD_6LOWPAN:
8a7a4b47 2203 return addrconf_ifid_6lowpan(eui, dev);
cb6bf355
YH		 2204 case ARPHRD_IEEE1394:
2205 return addrconf_ifid_ieee1394(eui, dev);
e837735e 2206 case ARPHRD_TUNNEL6:
45ce0fd1 2207 case ARPHRD_IP6GRE:
e837735e 2208 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2209 }
2210 return -1;
2211}
2212
2213static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2214{
2215 int err = -1;
2216 struct inet6_ifaddr *ifp;
2217
2218 read_lock_bh(&idev->lock);
602582ca
HFS		 2219 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2220 if (ifp->scope > IFA_LINK)
2221 break;
1da177e4
LT		 2222 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2223 memcpy(eui, ifp->addr.s6_addr+8, 8);
2224 err = 0;
2225 break;
2226 }
2227 }
2228 read_unlock_bh(&idev->lock);
2229 return err;
2230}
2231
1da177e4 2232/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
9d6280da 2233static void ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2234{
1da177e4 2235regen:
955189ef 2236 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2237 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2238
2239 /*
2240 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2241 * check if generated address is not inappropriate
2242 *
2243 * - Reserved subnet anycast (RFC 2526)
2244 * 11111101 11....11 1xxxxxxx
c7dc89c0 2245 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2246 * 00-00-5E-FE-xx-xx-xx-xx
2247 * - value 0
2248 * - XXX: already assigned to an address on the device
2249 */
1ab1457c 2250 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2251 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2252 (idev->rndid[7]&0x80))
2253 goto regen;
2254 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2255 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2256 goto regen;
2257 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2258 goto regen;
2259 }
1da177e4
LT		 2260}
2261
9d6280da 2262static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2263{
1da177e4 2264 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
9d6280da 2265 ipv6_regen_rndid(idev);
1da177e4 2266}
1da177e4
LT		 2267
2268/*
2269 * Add prefix route.
2270 */
2271
2272static void
2273addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2274 unsigned long expires, u32 flags)
1da177e4 2275{
86872cb5 2276 struct fib6_config cfg = {
ca254490 2277 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
86872cb5
TG		 2278 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2279 .fc_ifindex = dev->ifindex,
2280 .fc_expires = expires,
2281 .fc_dst_len = plen,
2282 .fc_flags = RTF_UP | flags,
c346dca1 2283 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2284 .fc_protocol = RTPROT_KERNEL,
86872cb5 2285 };
1da177e4 2286
4e3fd7a0 2287 cfg.fc_dst = *pfx;
1da177e4
LT		 2288
2289 /* Prevent useless cloning on PtP SIT.
2290 This thing is done here expecting that the whole
2291 class of non-broadcast devices need not cloning.
2292 */
07a93626 2293#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2294 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2295 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2296#endif
1da177e4 2297
333c4301 2298 ip6_route_add(&cfg, NULL);
1da177e4
LT		 2299}
2300
14ef37b6
AH		 2301
2302static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2303 int plen,
2304 const struct net_device *dev,
2305 u32 flags, u32 noflags)
2306{
2307 struct fib6_node *fn;
2308 struct rt6_info *rt = NULL;
2309 struct fib6_table *table;
ca254490 2310 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2311
ca254490 2312 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2313 if (!table)
14ef37b6
AH		 2314 return NULL;
2315
5744dd9b 2316 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2317 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2318 if (!fn)
2319 goto out;
1f56a01f
MKL		 2320
2321 noflags |= RTF_CACHE;
14ef37b6 2322 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2323 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2324 continue;
2325 if ((rt->rt6i_flags & flags) != flags)
2326 continue;
85da53bf 2327 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2328 continue;
2329 dst_hold(&rt->dst);
2330 break;
2331 }
2332out:
5744dd9b 2333 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2334 return rt;
2335}
2336
2337
1da177e4
LT		 2338/* Create "default" multicast route to the interface */
2339
2340static void addrconf_add_mroute(struct net_device *dev)
2341{
86872cb5 2342 struct fib6_config cfg = {
ca254490 2343 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2344 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2345 .fc_ifindex = dev->ifindex,
2346 .fc_dst_len = 8,
2347 .fc_flags = RTF_UP,
c346dca1 2348 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2349 };
2350
2351 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2352
333c4301 2353 ip6_route_add(&cfg, NULL);
1da177e4
LT		 2354}
2355
1da177e4
LT		 2356static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2357{
2358 struct inet6_dev *idev;
2359
2360 ASSERT_RTNL();
2361
e21e8467
SH		 2362 idev = ipv6_find_idev(dev);
2363 if (!idev)
64e724f6
BH		 2364 return ERR_PTR(-ENOBUFS);
2365
2366 if (idev->cnf.disable_ipv6)
2367 return ERR_PTR(-EACCES);
1da177e4
LT		 2368
2369 /* Add default multicast route */
ba46ee4c 2370 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
4af04aba 2371 addrconf_add_mroute(dev);
1da177e4 2372
1da177e4
LT		 2373 return idev;
2374}
2375
53bd6749
JP		 2376static void manage_tempaddrs(struct inet6_dev *idev,
2377 struct inet6_ifaddr *ifp,
2378 __u32 valid_lft, __u32 prefered_lft,
2379 bool create, unsigned long now)
2380{
2381 u32 flags;
2382 struct inet6_ifaddr *ift;
2383
2384 read_lock_bh(&idev->lock);
2385 /* update all temporary addresses in the list */
2386 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2387 int age, max_valid, max_prefered;
2388
2389 if (ifp != ift->ifpub)
2390 continue;
2391
2392 /* RFC 4941 section 3.3:
2393 * If a received option will extend the lifetime of a public
2394 * address, the lifetimes of temporary addresses should
2395 * be extended, subject to the overall constraint that no
2396 * temporary addresses should ever remain "valid" or "preferred"
2397 * for a time longer than (TEMP_VALID_LIFETIME) or
2398 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2399 */
2400 age = (now - ift->cstamp) / HZ;
2401 max_valid = idev->cnf.temp_valid_lft - age;
2402 if (max_valid < 0)
2403 max_valid = 0;
2404
2405 max_prefered = idev->cnf.temp_prefered_lft -
76506a98 2406 idev->desync_factor - age;
53bd6749
JP		 2407 if (max_prefered < 0)
2408 max_prefered = 0;
2409
2410 if (valid_lft > max_valid)
2411 valid_lft = max_valid;
2412
2413 if (prefered_lft > max_prefered)
2414 prefered_lft = max_prefered;
2415
2416 spin_lock(&ift->lock);
2417 flags = ift->flags;
2418 ift->valid_lft = valid_lft;
2419 ift->prefered_lft = prefered_lft;
2420 ift->tstamp = now;
2421 if (prefered_lft > 0)
2422 ift->flags &= ~IFA_F_DEPRECATED;
2423
2424 spin_unlock(&ift->lock);
2425 if (!(flags&IFA_F_TENTATIVE))
2426 ipv6_ifa_notify(0, ift);
2427 }
2428
2429 if ((create || list_empty(&idev->tempaddr_list)) &&
2430 idev->cnf.use_tempaddr > 0) {
2431 /* When a new public address is created as described
2432 * in [ADDRCONF], also create a new temporary address.
2433 * Also create a temporary address if it's enabled but
2434 * no temporary address currently exists.
2435 */
2436 read_unlock_bh(&idev->lock);
2437 ipv6_create_tempaddr(ifp, NULL);
2438 } else {
2439 read_unlock_bh(&idev->lock);
2440 }
2441}
2442
cc9da6cc
BM		 2443static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2444{
d35a00b8
FJ		 2445 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2446 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc
BM		 2447}
2448
cc84b3c6
AA		 2449int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2450 const struct prefix_info *pinfo,
2451 struct inet6_dev *in6_dev,
2452 const struct in6_addr *addr, int addr_type,
2453 u32 addr_flags, bool sllao, bool tokenized,
2454 __u32 valid_lft, u32 prefered_lft)
4f672235
AA		 2455{
2456 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2457 int create = 0, update_lft = 0;
2458
2459 if (!ifp && valid_lft) {
2460 int max_addresses = in6_dev->cnf.max_addresses;
2461
2462#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2463 if (in6_dev->cnf.optimistic_dad &&
2464 !net->ipv6.devconf_all->forwarding && sllao)
2465 addr_flags |= IFA_F_OPTIMISTIC;
2466#endif
2467
2468 /* Do not allow to create too much of autoconfigured
2469 * addresses; this would be too easy way to crash kernel.
2470 */
2471 if (!max_addresses ||
2472 ipv6_count_addresses(in6_dev) < max_addresses)
2473 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2474 pinfo->prefix_len,
2475 addr_type&IPV6_ADDR_SCOPE_MASK,
2476 addr_flags, valid_lft,
2477 prefered_lft);
2478
2479 if (IS_ERR_OR_NULL(ifp))
2480 return -1;
2481
2482 update_lft = 0;
2483 create = 1;
2484 spin_lock_bh(&ifp->lock);
2485 ifp->flags |= IFA_F_MANAGETEMPADDR;
2486 ifp->cstamp = jiffies;
2487 ifp->tokenized = tokenized;
2488 spin_unlock_bh(&ifp->lock);
2489 addrconf_dad_start(ifp);
2490 }
2491
2492 if (ifp) {
2493 u32 flags;
2494 unsigned long now;
2495 u32 stored_lft;
2496
2497 /* update lifetime (RFC2462 5.5.3 e) */
2498 spin_lock_bh(&ifp->lock);
2499 now = jiffies;
2500 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2501 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2502 else
2503 stored_lft = 0;
2504 if (!update_lft && !create && stored_lft) {
2505 const u32 minimum_lft = min_t(u32,
2506 stored_lft, MIN_VALID_LIFETIME);
2507 valid_lft = max(valid_lft, minimum_lft);
2508
2509 /* RFC4862 Section 5.5.3e:
2510 * "Note that the preferred lifetime of the
2511 * corresponding address is always reset to
2512 * the Preferred Lifetime in the received
2513 * Prefix Information option, regardless of
2514 * whether the valid lifetime is also reset or
2515 * ignored."
2516 *
2517 * So we should always update prefered_lft here.
2518 */
2519 update_lft = 1;
2520 }
2521
2522 if (update_lft) {
2523 ifp->valid_lft = valid_lft;
2524 ifp->prefered_lft = prefered_lft;
2525 ifp->tstamp = now;
2526 flags = ifp->flags;
2527 ifp->flags &= ~IFA_F_DEPRECATED;
2528 spin_unlock_bh(&ifp->lock);
2529
2530 if (!(flags&IFA_F_TENTATIVE))
2531 ipv6_ifa_notify(0, ifp);
2532 } else
2533 spin_unlock_bh(&ifp->lock);
2534
2535 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2536 create, now);
2537
2538 in6_ifa_put(ifp);
2539 addrconf_verify();
2540 }
2541
2542 return 0;
2543}
cc84b3c6 2544EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
4f672235 2545
e6bff995 2546void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2547{
2548 struct prefix_info *pinfo;
2549 __u32 valid_lft;
2550 __u32 prefered_lft;
4f672235 2551 int addr_type, err;
64236f3f 2552 u32 addr_flags = 0;
1da177e4 2553 struct inet6_dev *in6_dev;
56d417b1 2554 struct net *net = dev_net(dev);
1da177e4
LT		 2555
2556 pinfo = (struct prefix_info *) opt;
1ab1457c 2557
1da177e4 2558 if (len < sizeof(struct prefix_info)) {
ba3542e1 2559 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2560 return;
2561 }
1ab1457c 2562
1da177e4
LT		 2563 /*
2564 * Validation checks ([ADDRCONF], page 19)
2565 */
2566
2567 addr_type = ipv6_addr_type(&pinfo->prefix);
2568
2569 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2570 return;
2571
2572 valid_lft = ntohl(pinfo->valid);
2573 prefered_lft = ntohl(pinfo->prefered);
2574
2575 if (prefered_lft > valid_lft) {
e87cc472 2576 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2577 return;
2578 }
2579
2580 in6_dev = in6_dev_get(dev);
2581
63159f29 2582 if (!in6_dev) {
e87cc472
JP		 2583 net_dbg_ratelimited("addrconf: device %s not configured\n",
2584 dev->name);
1da177e4
LT		 2585 return;
2586 }
2587
2588 /*
2589 * Two things going on here:
2590 * 1) Add routes for on-link prefixes
2591 * 2) Configure prefixes with the auto flag set
2592 */
2593
4bed72e4
YH		 2594 if (pinfo->onlink) {
2595 struct rt6_info *rt;
2596 unsigned long rt_expires;
2597
6f704992
YH		 2598 /* Avoid arithmetic overflow. Really, we could
2599 * save rt_expires in seconds, likely valid_lft,
2600 * but it would require division in fib gc, that it
2601 * not good.
2602 */
4bed72e4
YH		 2603 if (HZ > USER_HZ)
2604 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2605 else
2606 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2607
4bed72e4
YH		 2608 if (addrconf_finite_timeout(rt_expires))
2609 rt_expires *= HZ;
1da177e4 2610
14ef37b6
AH		 2611 rt = addrconf_get_prefix_route(&pinfo->prefix,
2612 pinfo->prefix_len,
2613 dev,
2614 RTF_ADDRCONF | RTF_PREFIX_RT,
2615 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2616
14ef37b6 2617 if (rt) {
6f704992
YH		 2618 /* Autoconf prefix route */
2619 if (valid_lft == 0) {
2620 ip6_del_rt(rt);
2621 rt = NULL;
4bed72e4 2622 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2623 /* not infinity */
1716a961 2624 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2625 } else {
1716a961 2626 rt6_clean_expires(rt);
1da177e4
LT		 2627 }
2628 } else if (valid_lft) {
6f704992 2629 clock_t expires = 0;
4bed72e4
YH		 2630 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2631 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2632 /* not infinity */
2633 flags |= RTF_EXPIRES;
2634 expires = jiffies_to_clock_t(rt_expires);
2635 }
1da177e4 2636 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2637 dev, expires, flags);
1da177e4 2638 }
94e187c0 2639 ip6_rt_put(rt);
1da177e4
LT		 2640 }
2641
2642 /* Try to figure out our local address for this prefix */
2643
2644 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1da177e4 2645 struct in6_addr addr;
f997c55c 2646 bool tokenized = false, dev_addr_generated = false;
1da177e4
LT		 2647
2648 if (pinfo->prefix_len == 64) {
2649 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2650
2651 if (!ipv6_addr_any(&in6_dev->token)) {
2652 read_lock_bh(&in6_dev->lock);
2653 memcpy(addr.s6_addr + 8,
2654 in6_dev->token.s6_addr + 8, 8);
2655 read_unlock_bh(&in6_dev->lock);
617fe29d 2656 tokenized = true;
cc9da6cc 2657 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2658 !ipv6_generate_stable_address(&addr, 0,
2659 in6_dev)) {
64236f3f 2660 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2661 goto ok;
f53adae4
DB		 2662 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2663 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
4f672235 2664 goto put;
f997c55c
AA		 2665 } else {
2666 dev_addr_generated = true;
1da177e4
LT		 2667 }
2668 goto ok;
2669 }
e87cc472
JP		 2670 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2671 pinfo->prefix_len);
4f672235 2672 goto put;
1da177e4
LT		 2673
2674ok:
4f672235
AA		 2675 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2676 &addr, addr_type,
2677 addr_flags, sllao,
2678 tokenized, valid_lft,
2679 prefered_lft);
2680 if (err)
2681 goto put;
f997c55c
AA		 2682
2683 /* Ignore error case here because previous prefix add addr was
2684 * successful which will be notified.
2685 */
2686 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2687 addr_type, addr_flags, sllao,
2688 tokenized, valid_lft,
2689 prefered_lft,
2690 dev_addr_generated);
1da177e4
LT		 2691 }
2692 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
4f672235 2693put:
1da177e4
LT		 2694 in6_dev_put(in6_dev);
2695}
2696
2697/*
2698 * Set destination address.
2699 * Special case for SIT interfaces where we create a new "virtual"
2700 * device.
2701 */
af284937 2702int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2703{
2704 struct in6_ifreq ireq;
2705 struct net_device *dev;
2706 int err = -EINVAL;
2707
2708 rtnl_lock();
2709
2710 err = -EFAULT;
2711 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2712 goto err_exit;
2713
af284937 2714 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2715
2716 err = -ENODEV;
63159f29 2717 if (!dev)
1da177e4
LT		 2718 goto err_exit;
2719
07a93626 2720#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2721 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2722 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2723 struct ifreq ifr;
1da177e4
LT		 2724 struct ip_tunnel_parm p;
2725
2726 err = -EADDRNOTAVAIL;
2727 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2728 goto err_exit;
2729
2730 memset(&p, 0, sizeof(p));
2731 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2732 p.iph.saddr = 0;
2733 p.iph.version = 4;
2734 p.iph.ihl = 5;
2735 p.iph.protocol = IPPROTO_IPV6;
2736 p.iph.ttl = 64;
d20b3109 2737 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2738
5bc3eb7e
SH		 2739 if (ops->ndo_do_ioctl) {
2740 mm_segment_t oldfs = get_fs();
2741
2742 set_fs(KERNEL_DS);
2743 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2744 set_fs(oldfs);
2745 } else
2746 err = -EOPNOTSUPP;
1da177e4
LT		 2747
2748 if (err == 0) {
2749 err = -ENOBUFS;
af284937
DL		 2750 dev = __dev_get_by_name(net, p.name);
2751 if (!dev)
1da177e4
LT		 2752 goto err_exit;
2753 err = dev_open(dev);
2754 }
2755 }
0be669bb 2756#endif
1da177e4
LT		 2757
2758err_exit:
2759 rtnl_unlock();
2760 return err;
2761}
2762
93a714d6
MC		 2763static int ipv6_mc_config(struct sock *sk, bool join,
2764 const struct in6_addr *addr, int ifindex)
2765{
2766 int ret;
2767
2768 ASSERT_RTNL();
2769
2770 lock_sock(sk);
2771 if (join)
54ff9ef3 2772 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2773 else
54ff9ef3 2774 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2775 release_sock(sk);
2776
2777 return ret;
2778}
2779
1da177e4
LT		 2780/*
2781 * Manual configuration of address on an interface
2782 */
479840ff
JP		 2783static int inet6_addr_add(struct net *net, int ifindex,
2784 const struct in6_addr *pfx,
caeaba79 2785 const struct in6_addr *peer_pfx,
479840ff
JP		 2786 unsigned int plen, __u32 ifa_flags,
2787 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2788{
2789 struct inet6_ifaddr *ifp;
2790 struct inet6_dev *idev;
2791 struct net_device *dev;
93a714d6
MC		 2792 unsigned long timeout;
2793 clock_t expires;
1da177e4 2794 int scope;
6f704992 2795 u32 flags;
1da177e4
LT		 2796
2797 ASSERT_RTNL();
1ab1457c 2798
24ef0da7
TG		 2799 if (plen > 128)
2800 return -EINVAL;
2801
0778769d
NT		 2802 /* check the lifetime */
2803 if (!valid_lft || prefered_lft > valid_lft)
2804 return -EINVAL;
2805
53bd6749
JP		 2806 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2807 return -EINVAL;
2808
af284937
DL		 2809 dev = __dev_get_by_index(net, ifindex);
2810 if (!dev)
1da177e4 2811 return -ENODEV;
1ab1457c 2812
64e724f6
BH		 2813 idev = addrconf_add_dev(dev);
2814 if (IS_ERR(idev))
2815 return PTR_ERR(idev);
1da177e4 2816
93a714d6
MC		 2817 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2818 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2819 true, pfx, ifindex);
2820
2821 if (ret < 0)
2822 return ret;
2823 }
2824
1da177e4
LT		 2825 scope = ipv6_addr_scope(pfx);
2826
4bed72e4
YH		 2827 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2828 if (addrconf_finite_timeout(timeout)) {
2829 expires = jiffies_to_clock_t(timeout * HZ);
2830 valid_lft = timeout;
6f704992 2831 flags = RTF_EXPIRES;
4bed72e4
YH		 2832 } else {
2833 expires = 0;
2834 flags = 0;
2835 ifa_flags |= IFA_F_PERMANENT;
6f704992 2836 }
0778769d 2837
4bed72e4
YH		 2838 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2839 if (addrconf_finite_timeout(timeout)) {
2840 if (timeout == 0)
2841 ifa_flags |= IFA_F_DEPRECATED;
2842 prefered_lft = timeout;
2843 }
0778769d 2844
8a226b2c
JB		 2845 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2846 valid_lft, prefered_lft);
0778769d 2847
1da177e4 2848 if (!IS_ERR(ifp)) {
761aac73
TH		 2849 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2850 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2851 expires, flags);
2852 }
2853
95c385b4
NH		 2854 /*
2855 * Note that section 3.1 of RFC 4429 indicates
2856 * that the Optimistic flag should not be set for
2857 * manually configured addresses
2858 */
cf22f9a2 2859 addrconf_dad_start(ifp);
53bd6749
JP		 2860 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2861 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2862 true, jiffies);
1da177e4 2863 in6_ifa_put(ifp);
c15b1cca 2864 addrconf_verify_rtnl();
1da177e4 2865 return 0;
93a714d6
MC		 2866 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2867 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2868 false, pfx, ifindex);
1da177e4
LT		 2869 }
2870
2871 return PTR_ERR(ifp);
2872}
2873
6046d5b4
HK		 2874static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2875 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2876{
2877 struct inet6_ifaddr *ifp;
2878 struct inet6_dev *idev;
2879 struct net_device *dev;
1ab1457c 2880
24ef0da7
TG		 2881 if (plen > 128)
2882 return -EINVAL;
2883
af284937
DL		 2884 dev = __dev_get_by_index(net, ifindex);
2885 if (!dev)
1da177e4
LT		 2886 return -ENODEV;
2887
e5d08d71 2888 idev = __in6_dev_get(dev);
63159f29 2889 if (!idev)
1da177e4
LT		 2890 return -ENXIO;
2891
2892 read_lock_bh(&idev->lock);
502a2ffd 2893 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2894 if (ifp->prefix_len == plen &&
2895 ipv6_addr_equal(pfx, &ifp->addr)) {
2896 in6_ifa_hold(ifp);
2897 read_unlock_bh(&idev->lock);
1ab1457c 2898
6046d5b4
HK		 2899 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2900 (ifa_flags & IFA_F_MANAGETEMPADDR))
2901 manage_tempaddrs(idev, ifp, 0, 0, false,
2902 jiffies);
1da177e4 2903 ipv6_del_addr(ifp);
6046d5b4 2904 addrconf_verify_rtnl();
93a714d6
MC		 2905 if (ipv6_addr_is_multicast(pfx)) {
2906 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2907 false, pfx, dev->ifindex);
2908 }
1da177e4
LT		 2909 return 0;
2910 }
2911 }
2912 read_unlock_bh(&idev->lock);
2913 return -EADDRNOTAVAIL;
2914}
2915
2916
af284937 2917int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2918{
2919 struct in6_ifreq ireq;
2920 int err;
1ab1457c 2921
af31f412 2922 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2923 return -EPERM;
1ab1457c 2924
1da177e4
LT		 2925 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2926 return -EFAULT;
2927
2928 rtnl_lock();
caeaba79 2929 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2930 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2931 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2932 rtnl_unlock();
2933 return err;
2934}
2935
af284937 2936int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2937{
2938 struct in6_ifreq ireq;
2939 int err;
1ab1457c 2940
af31f412 2941 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2942 return -EPERM;
2943
2944 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2945 return -EFAULT;
2946
2947 rtnl_lock();
6046d5b4 2948 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2949 ireq.ifr6_prefixlen);
1da177e4
LT		 2950 rtnl_unlock();
2951 return err;
2952}
2953
b5f348e5
IJ		 2954static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2955 int plen, int scope)
2956{
2957 struct inet6_ifaddr *ifp;
2958
8a226b2c 2959 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2960 scope, IFA_F_PERMANENT,
2961 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2962 if (!IS_ERR(ifp)) {
2963 spin_lock_bh(&ifp->lock);
2964 ifp->flags &= ~IFA_F_TENTATIVE;
2965 spin_unlock_bh(&ifp->lock);
764d3be6 2966 rt_genid_bump_ipv6(dev_net(idev->dev));
b5f348e5
IJ		 2967 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2968 in6_ifa_put(ifp);
2969 }
2970}
2971
07a93626 2972#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2973static void sit_add_v4_addrs(struct inet6_dev *idev)
2974{
1da177e4
LT		 2975 struct in6_addr addr;
2976 struct net_device *dev;
c346dca1 2977 struct net *net = dev_net(idev->dev);
929c9cf3 2978 int scope, plen;
f0e2acfa 2979 u32 pflags = 0;
1da177e4
LT		 2980
2981 ASSERT_RTNL();
2982
2983 memset(&addr, 0, sizeof(struct in6_addr));
2984 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2985
2986 if (idev->dev->flags&IFF_POINTOPOINT) {
2987 addr.s6_addr32[0] = htonl(0xfe800000);
2988 scope = IFA_LINK;
929c9cf3 2989 plen = 64;
1da177e4
LT		 2990 } else {
2991 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2992 plen = 96;
f0e2acfa 2993 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2994 }
2995
2996 if (addr.s6_addr32[3]) {
929c9cf3 2997 add_addr(idev, &addr, plen, scope);
f0e2acfa 2998 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2999 return;
3000 }
3001
6fda7350 3002 for_each_netdev(net, dev) {
8e5e8f30 3003 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 3004 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 3005 struct in_ifaddr *ifa;
1da177e4
LT		 3006
3007 int flag = scope;
3008
3009 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 3010
3011 addr.s6_addr32[3] = ifa->ifa_local;
3012
3013 if (ifa->ifa_scope == RT_SCOPE_LINK)
3014 continue;
3015 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3016 if (idev->dev->flags&IFF_POINTOPOINT)
3017 continue;
3018 flag |= IFA_HOST;
3019 }
1da177e4 3020
b5f348e5 3021 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 3022 addrconf_prefix_route(&addr, plen, idev->dev, 0,
3023 pflags);
1da177e4
LT		 3024 }
3025 }
1ab1457c 3026 }
1da177e4 3027}
0be669bb 3028#endif
1da177e4
LT		 3029
3030static void init_loopback(struct net_device *dev)
3031{
3032 struct inet6_dev *idev;
25fb6ca4
BK		 3033 struct net_device *sp_dev;
3034 struct inet6_ifaddr *sp_ifa;
3035 struct rt6_info *sp_rt;
1da177e4
LT		 3036
3037 /* ::1 */
3038
3039 ASSERT_RTNL();
3040
e5d08d71 3041 idev = ipv6_find_idev(dev);
63159f29 3042 if (!idev) {
91df42be 3043 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3044 return;
3045 }
3046
b5f348e5 3047 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 3048
3049 /* Add routes to other interface's IPv6 addresses */
3050 for_each_netdev(dev_net(dev), sp_dev) {
3051 if (!strcmp(sp_dev->name, dev->name))
3052 continue;
3053
3054 idev = __in6_dev_get(sp_dev);
3055 if (!idev)
3056 continue;
3057
3058 read_lock_bh(&idev->lock);
3059 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
3060
3061 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
3062 continue;
3063
33d99113
G		 3064 if (sp_ifa->rt) {
3065 /* This dst has been added to garbage list when
3066 * lo device down, release this obsolete dst and
3067 * reallocate a new router for ifa.
3068 */
a220445f 3069 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
33d99113
G		 3070 ip6_rt_put(sp_ifa->rt);
3071 sp_ifa->rt = NULL;
3072 } else {
3073 continue;
3074 }
3075 }
a881ae1f 3076
57ec0afe 3077 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 3078
3079 /* Failure cases are ignored */
534c8779
G		 3080 if (!IS_ERR(sp_rt)) {
3081 sp_ifa->rt = sp_rt;
25fb6ca4 3082 ip6_ins_rt(sp_rt);
534c8779 3083 }
25fb6ca4
BK		 3084 }
3085 read_unlock_bh(&idev->lock);
3086 }
1da177e4
LT		 3087}
3088
2ad3ed59
AA		 3089void addrconf_add_linklocal(struct inet6_dev *idev,
3090 const struct in6_addr *addr, u32 flags)
1da177e4 3091{
8e5e8f30 3092 struct inet6_ifaddr *ifp;
64236f3f 3093 u32 addr_flags = flags | IFA_F_PERMANENT;
95c385b4
NH		 3094
3095#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3096 if (idev->cnf.optimistic_dad &&
702beb87 3097 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 3098 addr_flags |= IFA_F_OPTIMISTIC;
3099#endif
1da177e4 3100
07edd741
HFS		 3101 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3102 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 3103 if (!IS_ERR(ifp)) {
46d48046 3104 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 3105 addrconf_dad_start(ifp);
1da177e4
LT		 3106 in6_ifa_put(ifp);
3107 }
3108}
2ad3ed59 3109EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
1da177e4 3110
622c81d5
HFS		 3111static bool ipv6_reserved_interfaceid(struct in6_addr address)
3112{
3113 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3114 return true;
3115
3116 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3117 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3118 return true;
3119
3120 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3121 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3122 return true;
3123
3124 return false;
3125}
3126
3127static int ipv6_generate_stable_address(struct in6_addr *address,
3128 u8 dad_count,
3129 const struct inet6_dev *idev)
3130{
622c81d5
HFS		 3131 static DEFINE_SPINLOCK(lock);
3132 static __u32 digest[SHA_DIGEST_WORDS];
3133 static __u32 workspace[SHA_WORKSPACE_WORDS];
3134
3135 static union {
3136 char __data[SHA_MESSAGE_BYTES];
3137 struct {
3138 struct in6_addr secret;
ff40217e 3139 __be32 prefix[2];
622c81d5
HFS		 3140 unsigned char hwaddr[MAX_ADDR_LEN];
3141 u8 dad_count;
3142 } __packed;
3143 } data;
3144
3145 struct in6_addr secret;
3146 struct in6_addr temp;
3147 struct net *net = dev_net(idev->dev);
3148
3149 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3150
3151 if (idev->cnf.stable_secret.initialized)
3152 secret = idev->cnf.stable_secret.secret;
3153 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3154 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3155 else
3156 return -1;
3157
3158retry:
3159 spin_lock_bh(&lock);
3160
3161 sha_init(digest);
3162 memset(&data, 0, sizeof(data));
3163 memset(workspace, 0, sizeof(workspace));
3164 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3165 data.prefix[0] = address->s6_addr32[0];
3166 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3167 data.secret = secret;
3168 data.dad_count = dad_count;
3169
3170 sha_transform(digest, data.__data, workspace);
3171
3172 temp = *address;
ff40217e
HFS		 3173 temp.s6_addr32[2] = (__force __be32)digest[0];
3174 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3175
3176 spin_unlock_bh(&lock);
3177
3178 if (ipv6_reserved_interfaceid(temp)) {
3179 dad_count++;
1855b7c3 3180 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3181 return -1;
3182 goto retry;
3183 }
3184
3185 *address = temp;
3186 return 0;
3187}
3188
cc9da6cc
BM		 3189static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3190{
3191 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3192
3193 if (s->initialized)
3194 return;
3195 s = &idev->cnf.stable_secret;
3196 get_random_bytes(&s->secret, sizeof(s->secret));
3197 s->initialized = true;
3198}
3199
bc91b0f0
JP		 3200static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3201{
622c81d5
HFS		 3202 struct in6_addr addr;
3203
ca254490
DA		 3204 /* no link local addresses on L3 master devices */
3205 if (netif_is_l3_master(idev->dev))
3206 return;
3207
622c81d5 3208 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3209
d35a00b8 3210 switch (idev->cnf.addr_gen_mode) {
cc9da6cc
BM		 3211 case IN6_ADDR_GEN_MODE_RANDOM:
3212 ipv6_gen_mode_random_init(idev);
3213 /* fallthrough */
3214 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3215 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3216 addrconf_add_linklocal(idev, &addr,
3217 IFA_F_STABLE_PRIVACY);
622c81d5
HFS		 3218 else if (prefix_route)
3219 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3220 break;
3221 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3222 /* addrconf_add_linklocal also adds a prefix_route and we
3223 * only need to care about prefix routes if ipv6_generate_eui64
3224 * couldn't generate one.
3225 */
3226 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3227 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0
JP		 3228 else if (prefix_route)
3229 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3230 break;
3231 case IN6_ADDR_GEN_MODE_NONE:
3232 default:
3233 /* will not add any link local address */
3234 break;
bc91b0f0
JP		 3235 }
3236}
3237
1da177e4
LT		 3238static void addrconf_dev_config(struct net_device *dev)
3239{
8e5e8f30 3240 struct inet6_dev *idev;
1da177e4
LT		 3241
3242 ASSERT_RTNL();
3243
74235a25
HX		 3244 if ((dev->type != ARPHRD_ETHER) &&
3245 (dev->type != ARPHRD_FDDI) &&
74235a25 3246 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3247 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3248 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3249 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc 3250 (dev->type != ARPHRD_6LOWPAN) &&
45ce0fd1
FJ		 3251 (dev->type != ARPHRD_IP6GRE) &&
3252 (dev->type != ARPHRD_IPGRE) &&
3253 (dev->type != ARPHRD_TUNNEL) &&
cc9da6cc 3254 (dev->type != ARPHRD_NONE)) {
74235a25
HX		 3255 /* Alas, we support only Ethernet autoconfiguration. */
3256 return;
3257 }
3258
1da177e4 3259 idev = addrconf_add_dev(dev);
64e724f6 3260 if (IS_ERR(idev))
1da177e4
LT		 3261 return;
3262
cc9da6cc
BM		 3263 /* this device type has no EUI support */
3264 if (dev->type == ARPHRD_NONE &&
d35a00b8
FJ		 3265 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3266 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc 3267
bc91b0f0 3268 addrconf_addr_gen(idev, false);
1da177e4
LT		 3269}
3270
07a93626 3271#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3272static void addrconf_sit_config(struct net_device *dev)
3273{
3274 struct inet6_dev *idev;
3275
3276 ASSERT_RTNL();
3277
1ab1457c
YH		 3278 /*
3279 * Configure the tunnel with one of our IPv4
3280 * addresses... we should configure all of
1da177e4
LT		 3281 * our v4 addrs in the tunnel
3282 */
3283
e5d08d71 3284 idev = ipv6_find_idev(dev);
63159f29 3285 if (!idev) {
91df42be 3286 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3287 return;
3288 }
3289
c7dc89c0 3290 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3291 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3292 return;
3293 }
3294
1da177e4
LT		 3295 sit_add_v4_addrs(idev);
3296
62b54dd9 3297 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3298 addrconf_add_mroute(dev);
1da177e4 3299}
0be669bb 3300#endif
1da177e4 3301
07a93626 3302#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3303static void addrconf_gre_config(struct net_device *dev)
3304{
3305 struct inet6_dev *idev;
aee80b54 3306
aee80b54 3307 ASSERT_RTNL();
3308
e5d08d71 3309 idev = ipv6_find_idev(dev);
63159f29 3310 if (!idev) {
91df42be 3311 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3312 return;
3313 }
3314
bc91b0f0 3315 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3316 if (dev->flags & IFF_POINTOPOINT)
3317 addrconf_add_mroute(dev);
aee80b54 3318}
3319#endif
3320
f1705ec1
DA		 3321static int fixup_permanent_addr(struct inet6_dev *idev,
3322 struct inet6_ifaddr *ifp)
3323{
8048ced9
DA		 3324 /* rt6i_ref == 0 means the host route was removed from the
3325 * FIB, for example, if 'lo' device is taken down. In that
3326 * case regenerate the host route.
3327 */
3328 if (!ifp->rt || !atomic_read(&ifp->rt->rt6i_ref)) {
3329 struct rt6_info *rt, *prev;
f1705ec1
DA		 3330
3331 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3332 if (unlikely(IS_ERR(rt)))
3333 return PTR_ERR(rt);
3334
8048ced9
DA		 3335 /* ifp->rt can be accessed outside of rtnl */
3336 spin_lock(&ifp->lock);
3337 prev = ifp->rt;
f1705ec1 3338 ifp->rt = rt;
8048ced9
DA		 3339 spin_unlock(&ifp->lock);
3340
3341 ip6_rt_put(prev);
f1705ec1
DA		 3342 }
3343
3344 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3345 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3346 idev->dev, 0, 0);
3347 }
3348
6d717134
DA		 3349 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3350 addrconf_dad_start(ifp);
f1705ec1
DA		 3351
3352 return 0;
3353}
3354
3355static void addrconf_permanent_addr(struct net_device *dev)
3356{
3357 struct inet6_ifaddr *ifp, *tmp;
3358 struct inet6_dev *idev;
3359
3360 idev = __in6_dev_get(dev);
3361 if (!idev)
3362 return;
3363
3364 write_lock_bh(&idev->lock);
3365
3366 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3367 if ((ifp->flags & IFA_F_PERMANENT) &&
3368 fixup_permanent_addr(idev, ifp) < 0) {
3369 write_unlock_bh(&idev->lock);
3370 ipv6_del_addr(ifp);
3371 write_lock_bh(&idev->lock);
3372
3373 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3374 idev->dev->name, &ifp->addr);
3375 }
3376 }
3377
3378 write_unlock_bh(&idev->lock);
3379}
3380
1ab1457c 3381static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3382 void *ptr)
1da177e4 3383{
351638e7 3384 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4f7f34ea 3385 struct netdev_notifier_changeupper_info *info;
748e2d93 3386 struct inet6_dev *idev = __in6_dev_get(dev);
60abc0be 3387 struct net *net = dev_net(dev);
c5e33bdd 3388 int run_pending = 0;
b217d616 3389 int err;
1da177e4 3390
e21e8467 3391 switch (event) {
45ba9dd2 3392 case NETDEV_REGISTER:
74235a25 3393 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3394 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3395 if (IS_ERR(idev))
3396 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3397 }
3398 break;
bcdd553f 3399
b7b0b1d2
AD		 3400 case NETDEV_CHANGEMTU:
3401 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3402 if (dev->mtu < IPV6_MIN_MTU) {
60abc0be 3403 addrconf_ifdown(dev, dev != net->loopback_dev);
b7b0b1d2
AD		 3404 break;
3405 }
3406
3407 if (idev) {
3408 rt6_mtu_change(dev, dev->mtu);
3409 idev->cnf.mtu6 = dev->mtu;
3410 break;
3411 }
3412
3413 /* allocate new idev */
3414 idev = ipv6_add_dev(dev);
3415 if (IS_ERR(idev))
3416 break;
3417
3418 /* device is still not ready */
3419 if (!(idev->if_flags & IF_READY))
3420 break;
3421
3422 run_pending = 1;
3423
3424 /* fall through */
3425
1da177e4 3426 case NETDEV_UP:
3c21edbd 3427 case NETDEV_CHANGE:
c2edacf8
JV		 3428 if (dev->flags & IFF_SLAVE)
3429 break;
3430
3ce62a84
WC		 3431 if (idev && idev->cnf.disable_ipv6)
3432 break;
3433
3c21edbd 3434 if (event == NETDEV_UP) {
38bd10c4
DA		 3435 /* restore routes for permanent addresses */
3436 addrconf_permanent_addr(dev);
3437
f24e3d65 3438 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 3439 /* device is not ready yet. */
f3213831 3440 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3441 dev->name);
3442 break;
3443 }
99081049 3444
d31c7b8f
EP		 3445 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3446 idev = ipv6_add_dev(dev);
3447
a317a2f1 3448 if (!IS_ERR_OR_NULL(idev)) {
99081049 3449 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3450 run_pending = 1;
3451 }
b7b0b1d2 3452 } else if (event == NETDEV_CHANGE) {
f24e3d65 3453 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 3454 /* device is still not ready. */
3455 break;
3456 }
3457
3458 if (idev) {
a088d1d7
LL		 3459 if (idev->if_flags & IF_READY) {
3460 /* device is already configured -
3461 * but resend MLD reports, we might
3462 * have roamed and need to update
3463 * multicast snooping switches
3464 */
3465 ipv6_mc_up(idev);
3c21edbd 3466 break;
a088d1d7 3467 }
3c21edbd
YH		 3468 idev->if_flags |= IF_READY;
3469 }
3470
f3213831
JP		 3471 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3472 dev->name);
3c21edbd 3473
c5e33bdd 3474 run_pending = 1;
3c21edbd
YH		 3475 }
3476
e21e8467 3477 switch (dev->type) {
07a93626 3478#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3479 case ARPHRD_SIT:
3480 addrconf_sit_config(dev);
3481 break;
aee80b54 3482#endif
07a93626 3483#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3484 case ARPHRD_IPGRE:
3485 addrconf_gre_config(dev);
3486 break;
0be669bb 3487#endif
1da177e4
LT		 3488 case ARPHRD_LOOPBACK:
3489 init_loopback(dev);
3490 break;
3491
3492 default:
3493 addrconf_dev_config(dev);
3494 break;
3ff50b79 3495 }
bcdd553f 3496
a317a2f1 3497 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3498 if (run_pending)
3499 addrconf_dad_run(idev);
3500
bcdd553f
SH		 3501 /*
3502 * If the MTU changed during the interface down,
3503 * when the interface up, the changed MTU must be
3504 * reflected in the idev as well as routers.
1da177e4 3505 */
bcdd553f
SH		 3506 if (idev->cnf.mtu6 != dev->mtu &&
3507 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3508 rt6_mtu_change(dev, dev->mtu);
3509 idev->cnf.mtu6 = dev->mtu;
3510 }
3511 idev->tstamp = jiffies;
3512 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3513
3514 /*
3515 * If the changed mtu during down is lower than
3516 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3517 */
3518 if (dev->mtu < IPV6_MIN_MTU)
60abc0be 3519 addrconf_ifdown(dev, dev != net->loopback_dev);
1da177e4
LT		 3520 }
3521 break;
3522
1da177e4
LT		 3523 case NETDEV_DOWN:
3524 case NETDEV_UNREGISTER:
3525 /*
3526 * Remove all addresses from this interface.
3527 */
3528 addrconf_ifdown(dev, event != NETDEV_DOWN);
3529 break;
3c21edbd 3530
1da177e4 3531 case NETDEV_CHANGENAME:
1da177e4 3532 if (idev) {
5632c515 3533 snmp6_unregister_dev(idev);
408c4768 3534 addrconf_sysctl_unregister(idev);
a317a2f1 3535 err = addrconf_sysctl_register(idev);
b217d616
HX		 3536 if (err)
3537 return notifier_from_errno(err);
a317a2f1
WC		 3538 err = snmp6_register_dev(idev);
3539 if (err) {
3540 addrconf_sysctl_unregister(idev);
3541 return notifier_from_errno(err);
3542 }
5632c515 3543 }
1da177e4 3544 break;
bcdd553f 3545
93d9b7d7
JP		 3546 case NETDEV_PRE_TYPE_CHANGE:
3547 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3548 if (idev)
3549 addrconf_type_change(dev, event);
75c78500 3550 break;
4f7f34ea
DA		 3551
3552 case NETDEV_CHANGEUPPER:
3553 info = ptr;
3554
3555 /* flush all routes if dev is linked to or unlinked from
3556 * an L3 master device (e.g., VRF)
3557 */
3558 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3559 addrconf_ifdown(dev, 0);
3ff50b79 3560 }
1da177e4
LT		 3561
3562 return NOTIFY_OK;
3563}
3564
3565/*
3566 * addrconf module should be notified of a device going up
3567 */
3568static struct notifier_block ipv6_dev_notf = {
3569 .notifier_call = addrconf_notify,
242d3a49 3570 .priority = ADDRCONF_NOTIFY_PRIORITY,
1da177e4
LT		 3571};
3572
93d9b7d7 3573static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3574{
3575 struct inet6_dev *idev;
3576 ASSERT_RTNL();
3577
3578 idev = __in6_dev_get(dev);
3579
93d9b7d7 3580 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3581 ipv6_mc_remap(idev);
93d9b7d7 3582 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3583 ipv6_mc_unmap(idev);
3584}
3585
70af921d
DA		 3586static bool addr_is_local(const struct in6_addr *addr)
3587{
3588 return ipv6_addr_type(addr) &
3589 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3590}
3591
1da177e4
LT		 3592static int addrconf_ifdown(struct net_device *dev, int how)
3593{
c346dca1 3594 struct net *net = dev_net(dev);
502a2ffd 3595 struct inet6_dev *idev;
f1705ec1
DA		 3596 struct inet6_ifaddr *ifa, *tmp;
3597 struct list_head del_list;
3598 int _keep_addr;
3599 bool keep_addr;
73a8bd74 3600 int state, i;
1da177e4
LT		 3601
3602 ASSERT_RTNL();
3603
73a8bd74
DM		 3604 rt6_ifdown(net, dev);
3605 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3606
3607 idev = __in6_dev_get(dev);
63159f29 3608 if (!idev)
1da177e4
LT		 3609 return -ENODEV;
3610
bcdd553f
SH		 3611 /*
3612 * Step 1: remove reference to ipv6 device from parent device.
3613 * Do not dev_put!
1da177e4 3614 */
439e2385 3615 if (how) {
1da177e4 3616 idev->dead = 1;
8814c4b5
YH		 3617
3618 /* protected by rtnl_lock */
a9b3cd7f 3619 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3620
3621 /* Step 1.5: remove snmp6 entry */
3622 snmp6_unregister_dev(idev);
3623
3624 }
3625
f1705ec1
DA		 3626 /* aggregate the system setting and interface setting */
3627 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3628 if (!_keep_addr)
3629 _keep_addr = idev->cnf.keep_addr_on_down;
3630
3631 /* combine the user config with event to determine if permanent
3632 * addresses are to be removed from address hash table
3633 */
bc561632 3634 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
f1705ec1 3635
73a8bd74
DM		 3636 /* Step 2: clear hash table */
3637 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3638 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3639
3640 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3641restart:
b67bfe0d 3642 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3643 if (ifa->idev == idev) {
c15b1cca 3644 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3645 /* combined flag + permanent flag decide if
3646 * address is retained on a down event
3647 */
3648 if (!keep_addr ||
70af921d
DA		 3649 !(ifa->flags & IFA_F_PERMANENT) ||
3650 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3651 hlist_del_init_rcu(&ifa->addr_lst);
3652 goto restart;
3653 }
73a8bd74
DM		 3654 }
3655 }
3656 spin_unlock_bh(&addrconf_hash_lock);
3657 }
3658
1da177e4
LT		 3659 write_lock_bh(&idev->lock);
3660
b7b1bfce
HFS		 3661 addrconf_del_rs_timer(idev);
3662
bcdd553f 3663 /* Step 2: clear flags for stateless addrconf */
439e2385 3664 if (!how)
3c21edbd 3665 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3666
bcdd553f 3667 /* Step 3: clear tempaddr list */
372e6c8f 3668 while (!list_empty(&idev->tempaddr_list)) {
3669 ifa = list_first_entry(&idev->tempaddr_list,
3670 struct inet6_ifaddr, tmp_list);
3671 list_del(&ifa->tmp_list);
1da177e4
LT		 3672 write_unlock_bh(&idev->lock);
3673 spin_lock_bh(&ifa->lock);
3674
3675 if (ifa->ifpub) {
3676 in6_ifa_put(ifa->ifpub);
3677 ifa->ifpub = NULL;
3678 }
3679 spin_unlock_bh(&ifa->lock);
3680 in6_ifa_put(ifa);
3681 write_lock_bh(&idev->lock);
3682 }
8f37ada5 3683
f1705ec1
DA		 3684 /* re-combine the user config with event to determine if permanent
3685 * addresses are to be removed from the interface list
3686 */
bc561632 3687 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
84e8b803 3688
f1705ec1
DA		 3689 INIT_LIST_HEAD(&del_list);
3690 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
38bd10c4 3691 struct rt6_info *rt = NULL;
a2d6cbb0 3692 bool keep;
38bd10c4 3693
f1705ec1 3694 addrconf_del_dad_work(ifa);
84e8b803 3695
a2d6cbb0
RV		 3696 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3697 !addr_is_local(&ifa->addr);
3698 if (!keep)
3699 list_move(&ifa->if_list, &del_list);
3700
73a8bd74 3701 write_unlock_bh(&idev->lock);
8e8e676d 3702 spin_lock_bh(&ifa->lock);
f1705ec1 3703
a2d6cbb0 3704 if (keep) {
f1705ec1
DA		 3705 /* set state to skip the notifier below */
3706 state = INET6_IFADDR_STATE_DEAD;
6d717134 3707 ifa->state = INET6_IFADDR_STATE_PREDAD;
f1705ec1
DA		 3708 if (!(ifa->flags & IFA_F_NODAD))
3709 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3710
3711 rt = ifa->rt;
3712 ifa->rt = NULL;
f1705ec1
DA		 3713 } else {
3714 state = ifa->state;
3715 ifa->state = INET6_IFADDR_STATE_DEAD;
f1705ec1
DA		 3716 }
3717
8e8e676d 3718 spin_unlock_bh(&ifa->lock);
9d82ca98 3719
38bd10c4
DA		 3720 if (rt)
3721 ip6_del_rt(rt);
3722
73a8bd74
DM		 3723 if (state != INET6_IFADDR_STATE_DEAD) {
3724 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3725 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
ea06f717
MM		 3726 } else {
3727 if (idev->cnf.forwarding)
3728 addrconf_leave_anycast(ifa);
3729 addrconf_leave_solict(ifa->idev, &ifa->addr);
27bdb2ab 3730 }
8f37ada5 3731
73a8bd74
DM		 3732 write_lock_bh(&idev->lock);
3733 }
8f37ada5 3734
1da177e4
LT		 3735 write_unlock_bh(&idev->lock);
3736
f1705ec1
DA		 3737 /* now clean up addresses to be removed */
3738 while (!list_empty(&del_list)) {
3739 ifa = list_first_entry(&del_list,
3740 struct inet6_ifaddr, if_list);
3741 list_del(&ifa->if_list);
3742
3743 in6_ifa_put(ifa);
3744 }
3745
381f4dca
SD		 3746 /* Step 5: Discard anycast and multicast list */
3747 if (how) {
3748 ipv6_ac_destroy_dev(idev);
1da177e4 3749 ipv6_mc_destroy_dev(idev);
381f4dca 3750 } else {
1da177e4 3751 ipv6_mc_down(idev);
381f4dca 3752 }
1da177e4 3753
1da177e4 3754 idev->tstamp = jiffies;
1ab1457c 3755
bcdd553f 3756 /* Last: Shot the device (if unregistered) */
439e2385 3757 if (how) {
408c4768 3758 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3759 neigh_parms_release(&nd_tbl, idev->nd_parms);
3760 neigh_ifdown(&nd_tbl, dev);
3761 in6_dev_put(idev);
3762 }
3763 return 0;
3764}
3765
3766static void addrconf_rs_timer(unsigned long data)
3767{
b7b1bfce 3768 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3769 struct net_device *dev = idev->dev;
b7b1bfce 3770 struct in6_addr lladdr;
1da177e4 3771
b7b1bfce 3772 write_lock(&idev->lock);
5b2a1953 3773 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3774 goto out;
3775
9ba2add3 3776 if (!ipv6_accept_ra(idev))
5b2a1953 3777 goto out;
3778
3779 /* Announcement received after solicitation was sent */
3780 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3781 goto out;
1da177e4 3782
bd11f074 3783 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
caf92bc4
CW		 3784 write_unlock(&idev->lock);
3785 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3786 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3787 &in6addr_linklocal_allrouters);
3788 else
caf92bc4 3789 goto put;
1da177e4 3790
caf92bc4 3791 write_lock(&idev->lock);
bd11f074
MŻ		 3792 idev->rs_interval = rfc3315_s14_backoff_update(
3793 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
b7b1bfce
HFS		 3794 /* The wait after the last probe can be shorter */
3795 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3796 idev->cnf.rtr_solicits) ?
3797 idev->cnf.rtr_solicit_delay :
bd11f074 3798 idev->rs_interval);
1da177e4 3799 } else {
1da177e4
LT		 3800 /*
3801 * Note: we do not support deprecated "all on-link"
3802 * assumption any longer.
3803 */
91df42be 3804 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3805 }
3806
3807out:
b7b1bfce 3808 write_unlock(&idev->lock);
caf92bc4 3809put:
b7b1bfce 3810 in6_dev_put(idev);
1da177e4
LT		 3811}
3812
3813/*
3814 * Duplicate Address Detection
3815 */
3c21edbd
YH		 3816static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3817{
3818 unsigned long rand_num;
3819 struct inet6_dev *idev = ifp->idev;
adc176c5 3820 u64 nonce;
3c21edbd 3821
95c385b4
NH		 3822 if (ifp->flags & IFA_F_OPTIMISTIC)
3823 rand_num = 0;
3824 else
63862b5b 3825 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3826
adc176c5
EN		 3827 nonce = 0;
3828 if (idev->cnf.enhanced_dad ||
3829 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3830 do
3831 get_random_bytes(&nonce, 6);
3832 while (nonce == 0);
3833 }
3834 ifp->dad_nonce = nonce;
b7b1bfce 3835 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3836 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3837}
3838
c15b1cca 3839static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3840{
3841 struct inet6_dev *idev = ifp->idev;
3842 struct net_device *dev = idev->dev;
764d3be6 3843 bool bump_id, notify = false;
1da177e4
LT		 3844
3845 addrconf_join_solict(dev, &ifp->addr);
3846
63862b5b 3847 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3848
3849 read_lock_bh(&idev->lock);
622ccdf1 3850 spin_lock(&ifp->lock);
e9d3e084 3851 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3852 goto out;
1da177e4
LT		 3853
3854 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3855 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3856 !(ifp->flags&IFA_F_TENTATIVE) ||
3857 ifp->flags & IFA_F_NODAD) {
764d3be6 3858 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3859 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3860 spin_unlock(&ifp->lock);
1da177e4
LT		 3861 read_unlock_bh(&idev->lock);
3862
764d3be6 3863 addrconf_dad_completed(ifp, bump_id);
1da177e4
LT		 3864 return;
3865 }
3866
6732bade 3867 if (!(idev->if_flags & IF_READY)) {
21809faf 3868 spin_unlock(&ifp->lock);
6732bade 3869 read_unlock_bh(&idev->lock);
3c21edbd 3870 /*
590a9887 3871 * If the device is not ready:
3c21edbd
YH		 3872 * - keep it tentative if it is a permanent address.
3873 * - otherwise, kill it.
3874 */
3875 in6_ifa_hold(ifp);
cc411d0b 3876 addrconf_dad_stop(ifp, 0);
6732bade 3877 return;
3c21edbd 3878 }
95c385b4
NH		 3879
3880 /*
3881 * Optimistic nodes can start receiving
3882 * Frames right away
3883 */
7fd2561e 3884 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3885 ip6_ins_rt(ifp->rt);
7fd2561e
EK		 3886 if (ipv6_use_optimistic_addr(idev)) {
3887 /* Because optimistic nodes can use this address,
3888 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3889 */
16186a82 3890 notify = true;
7fd2561e
EK		 3891 }
3892 }
95c385b4 3893
6732bade 3894 addrconf_dad_kick(ifp);
1da177e4 3895out:
622ccdf1 3896 spin_unlock(&ifp->lock);
1da177e4 3897 read_unlock_bh(&idev->lock);
16186a82
SAK		 3898 if (notify)
3899 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 3900}
3901
c15b1cca 3902static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3903{
c15b1cca
HFS		 3904 bool begin_dad = false;
3905
8e8e676d 3906 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3907 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3908 ifp->state = INET6_IFADDR_STATE_PREDAD;
3909 begin_dad = true;
3910 }
8e8e676d 3911 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3912
3913 if (begin_dad)
3914 addrconf_mod_dad_work(ifp, 0);
3915}
3916
3917static void addrconf_dad_work(struct work_struct *w)
3918{
3919 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3920 struct inet6_ifaddr,
3921 dad_work);
1da177e4 3922 struct inet6_dev *idev = ifp->idev;
764d3be6 3923 bool bump_id, disable_ipv6 = false;
1da177e4
LT		 3924 struct in6_addr mcaddr;
3925
c15b1cca
HFS		 3926 enum {
3927 DAD_PROCESS,
3928 DAD_BEGIN,
3929 DAD_ABORT,
3930 } action = DAD_PROCESS;
3931
3932 rtnl_lock();
3933
8e8e676d 3934 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3935 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3936 action = DAD_BEGIN;
3937 ifp->state = INET6_IFADDR_STATE_DAD;
3938 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3939 action = DAD_ABORT;
3940 ifp->state = INET6_IFADDR_STATE_POSTDAD;
85b51b12
MM		 3941
3942 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3943 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3944 struct in6_addr addr;
3945
3946 addr.s6_addr32[0] = htonl(0xfe800000);
3947 addr.s6_addr32[1] = 0;
3948
3949 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3950 ipv6_addr_equal(&ifp->addr, &addr)) {
3951 /* DAD failed for link-local based on MAC */
3952 idev->cnf.disable_ipv6 = 1;
3953
3954 pr_info("%s: IPv6 being disabled!\n",
3955 ifp->idev->dev->name);
3956 disable_ipv6 = true;
3957 }
3958 }
c15b1cca 3959 }
8e8e676d 3960 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3961
3962 if (action == DAD_BEGIN) {
3963 addrconf_dad_begin(ifp);
3964 goto out;
3965 } else if (action == DAD_ABORT) {
751eb6b6 3966 in6_ifa_hold(ifp);
c15b1cca 3967 addrconf_dad_stop(ifp, 1);
85b51b12
MM		 3968 if (disable_ipv6)
3969 addrconf_ifdown(idev->dev, 0);
c15b1cca
HFS		 3970 goto out;
3971 }
3972
b7b1bfce 3973 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3974 goto out;
3975
c15b1cca 3976 write_lock_bh(&idev->lock);
122e4519 3977 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3978 write_unlock_bh(&idev->lock);
1da177e4
LT		 3979 goto out;
3980 }
21809faf 3981
3982 spin_lock(&ifp->lock);
622ccdf1
HX		 3983 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3984 spin_unlock(&ifp->lock);
c15b1cca 3985 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3986 goto out;
3987 }
3988
b7b1bfce 3989 if (ifp->dad_probes == 0) {
1da177e4
LT		 3990 /*
3991 * DAD was successful
3992 */
3993
764d3be6 3994 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3995 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3996 spin_unlock(&ifp->lock);
c15b1cca 3997 write_unlock_bh(&idev->lock);
1da177e4 3998
764d3be6 3999 addrconf_dad_completed(ifp, bump_id);
1da177e4
LT		 4000
4001 goto out;
4002 }
4003
b7b1bfce 4004 ifp->dad_probes--;
c15b1cca
HFS		 4005 addrconf_mod_dad_work(ifp,
4006 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 4007 spin_unlock(&ifp->lock);
c15b1cca 4008 write_unlock_bh(&idev->lock);
1da177e4
LT		 4009
4010 /* send a neighbour solicitation for our addr */
1da177e4 4011 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
adc176c5
EN		 4012 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4013 ifp->dad_nonce);
1da177e4
LT		 4014out:
4015 in6_ifa_put(ifp);
c15b1cca 4016 rtnl_unlock();
1da177e4
LT		 4017}
4018
11ffff75
HFS		 4019/* ifp->idev must be at least read locked */
4020static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4021{
4022 struct inet6_ifaddr *ifpiter;
4023 struct inet6_dev *idev = ifp->idev;
4024
602582ca
HFS		 4025 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4026 if (ifpiter->scope > IFA_LINK)
4027 break;
11ffff75
HFS		 4028 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4029 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4030 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4031 IFA_F_PERMANENT)
4032 return false;
4033 }
4034 return true;
4035}
4036
764d3be6 4037static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id)
1da177e4 4038{
e21e8467 4039 struct net_device *dev = ifp->idev->dev;
b7b1bfce 4040 struct in6_addr lladdr;
b173ee48 4041 bool send_rs, send_mld;
b7b1bfce 4042
c15b1cca 4043 addrconf_del_dad_work(ifp);
1da177e4
LT		 4044
4045 /*
4046 * Configure the address for reception. Now it is valid.
4047 */
4048
4049 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4050
026359bc
TA		 4051 /* If added prefix is link local and we are prepared to process
4052 router advertisements, start sending router solicitations.
1da177e4
LT		 4053 */
4054
1ec047eb 4055 read_lock_bh(&ifp->idev->lock);
11ffff75 4056 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 4057 send_rs = send_mld &&
4058 ipv6_accept_ra(ifp->idev) &&
bd11f074 4059 ifp->idev->cnf.rtr_solicits != 0 &&
b173ee48 4060 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 4061 read_unlock_bh(&ifp->idev->lock);
4062
b173ee48
HFS		 4063 /* While dad is in progress mld report's source address is in6_addrany.
4064 * Resend with proper ll now.
4065 */
4066 if (send_mld)
4067 ipv6_mc_dad_complete(ifp->idev);
4068
1ec047eb 4069 if (send_rs) {
1da177e4
LT		 4070 /*
4071 * If a host as already performed a random delay
4072 * [...] as part of DAD [...] there is no need
4073 * to delay again before sending the first RS
4074 */
1ec047eb 4075 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 4076 return;
1ec047eb 4077 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 4078
b7b1bfce
HFS		 4079 write_lock_bh(&ifp->idev->lock);
4080 spin_lock(&ifp->lock);
bd11f074
MŻ		 4081 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4082 ifp->idev->cnf.rtr_solicit_interval);
b7b1bfce 4083 ifp->idev->rs_probes = 1;
1da177e4 4084 ifp->idev->if_flags |= IF_RS_SENT;
bd11f074 4085 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
b7b1bfce
HFS		 4086 spin_unlock(&ifp->lock);
4087 write_unlock_bh(&ifp->idev->lock);
1da177e4 4088 }
764d3be6
PA		 4089
4090 if (bump_id)
4091 rt_genid_bump_ipv6(dev_net(dev));
a11a7f71
MH		 4092
4093 /* Make sure that a new temporary address will be created
4094 * before this temporary address becomes deprecated.
4095 */
4096 if (ifp->flags & IFA_F_TEMPORARY)
4097 addrconf_verify_rtnl();
1da177e4
LT		 4098}
4099
e21e8467
SH		 4100static void addrconf_dad_run(struct inet6_dev *idev)
4101{
c5e33bdd
YH		 4102 struct inet6_ifaddr *ifp;
4103
4104 read_lock_bh(&idev->lock);
502a2ffd 4105 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 4106 spin_lock(&ifp->lock);
f2344a13
HX		 4107 if (ifp->flags & IFA_F_TENTATIVE &&
4108 ifp->state == INET6_IFADDR_STATE_DAD)
4109 addrconf_dad_kick(ifp);
21809faf 4110 spin_unlock(&ifp->lock);
c5e33bdd
YH		 4111 }
4112 read_unlock_bh(&idev->lock);
4113}
4114
1da177e4
LT		 4115#ifdef CONFIG_PROC_FS
4116struct if6_iter_state {
3c40090a 4117 struct seq_net_private p;
1da177e4 4118 int bucket;
1d578303 4119 int offset;
1da177e4
LT		 4120};
4121
1d578303 4122static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 4123{
4124 struct inet6_ifaddr *ifa = NULL;
4125 struct if6_iter_state *state = seq->private;
1218854a 4126 struct net *net = seq_file_net(seq);
1d578303 4127 int p = 0;
1da177e4 4128
1d578303
MM		 4129 /* initial bucket if pos is 0 */
4130 if (pos == 0) {
4131 state->bucket = 0;
4132 state->offset = 0;
4133 }
4134
4135 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 4136 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 4137 addr_lst) {
9f0d3c27
ED		 4138 if (!net_eq(dev_net(ifa->idev->dev), net))
4139 continue;
1d578303
MM		 4140 /* sync with offset */
4141 if (p < state->offset) {
4142 p++;
4143 continue;
4144 }
4145 state->offset++;
9f0d3c27 4146 return ifa;
1d578303
MM		 4147 }
4148
4149 /* prepare for next bucket */
4150 state->offset = 0;
4151 p = 0;
1da177e4 4152 }
c2e21293 4153 return NULL;
1da177e4
LT		 4154}
4155
c2e21293 4156static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4157 struct inet6_ifaddr *ifa)
1da177e4
LT		 4158{
4159 struct if6_iter_state *state = seq->private;
1218854a 4160 struct net *net = seq_file_net(seq);
1da177e4 4161
b67bfe0d 4162 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 4163 if (!net_eq(dev_net(ifa->idev->dev), net))
4164 continue;
1d578303 4165 state->offset++;
9f0d3c27 4166 return ifa;
1d578303 4167 }
3c40090a 4168
c2e21293 4169 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 4170 state->offset = 0;
b67bfe0d 4171 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 4172 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 4173 if (!net_eq(dev_net(ifa->idev->dev), net))
4174 continue;
1d578303 4175 state->offset++;
9f0d3c27 4176 return ifa;
c2e21293 4177 }
1da177e4 4178 }
3c40090a 4179
c2e21293 4180 return NULL;
1da177e4
LT		 4181}
4182
1da177e4 4183static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 4184 __acquires(rcu_bh)
1da177e4 4185{
5c578aed 4186 rcu_read_lock_bh();
1d578303 4187 return if6_get_first(seq, *pos);
1da177e4
LT		 4188}
4189
4190static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4191{
4192 struct inet6_ifaddr *ifa;
4193
4194 ifa = if6_get_next(seq, v);
4195 ++*pos;
4196 return ifa;
4197}
4198
4199static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 4200 __releases(rcu_bh)
1da177e4 4201{
5c578aed 4202 rcu_read_unlock_bh();
1da177e4
LT		 4203}
4204
4205static int if6_seq_show(struct seq_file *seq, void *v)
4206{
4207 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4208 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4209 &ifp->addr,
1da177e4
LT		 4210 ifp->idev->dev->ifindex,
4211 ifp->prefix_len,
4212 ifp->scope,
971a351c 4213 (u8) ifp->flags,
1da177e4
LT		 4214 ifp->idev->dev->name);
4215 return 0;
4216}
4217
56b3d975 4218static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4219 .start = if6_seq_start,
4220 .next = if6_seq_next,
4221 .show = if6_seq_show,
4222 .stop = if6_seq_stop,
4223};
4224
4225static int if6_seq_open(struct inode *inode, struct file *file)
4226{
3c40090a
DL		 4227 return seq_open_net(inode, file, &if6_seq_ops,
4228 sizeof(struct if6_iter_state));
1da177e4
LT		 4229}
4230
9a32144e 4231static const struct file_operations if6_fops = {
1da177e4
LT		 4232 .owner = THIS_MODULE,
4233 .open = if6_seq_open,
4234 .read = seq_read,
4235 .llseek = seq_lseek,
3c40090a 4236 .release = seq_release_net,
1da177e4
LT		 4237};
4238
2c8c1e72 4239static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4240{
d4beaa66 4241 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 4242 return -ENOMEM;
4243 return 0;
4244}
4245
2c8c1e72 4246static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4247{
ece31ffd 4248 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4249}
4250
4251static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4252 .init = if6_proc_net_init,
4253 .exit = if6_proc_net_exit,
3c40090a
DL		 4254};
4255
4256int __init if6_proc_init(void)
4257{
4258 return register_pernet_subsys(&if6_proc_net_ops);
4259}
4260
1da177e4
LT		 4261void if6_proc_exit(void)
4262{
3c40090a 4263 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4264}
4265#endif /* CONFIG_PROC_FS */
4266
07a93626 4267#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4268/* Check if address is a home address configured on any interface. */
b71d1d42 4269int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 4270{
4271 int ret = 0;
c2e21293 4272 struct inet6_ifaddr *ifp = NULL;
ddbe5032 4273 unsigned int hash = inet6_addr_hash(addr);
c2e21293 4274
5c578aed 4275 rcu_read_lock_bh();
b67bfe0d 4276 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 4277 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 4278 continue;
caad295f 4279 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4280 (ifp->flags & IFA_F_HOMEADDRESS)) {
4281 ret = 1;
4282 break;
4283 }
4284 }
5c578aed 4285 rcu_read_unlock_bh();
3b9f9a1c
NT		 4286 return ret;
4287}
4288#endif
4289
1da177e4
LT		 4290/*
4291 * Periodic address status verification
4292 */
4293
c15b1cca 4294static void addrconf_verify_rtnl(void)
1da177e4 4295{
b2db7564 4296 unsigned long now, next, next_sec, next_sched;
1da177e4 4297 struct inet6_ifaddr *ifp;
1da177e4
LT		 4298 int i;
4299
c15b1cca
HFS		 4300 ASSERT_RTNL();
4301
5c578aed 4302 rcu_read_lock_bh();
1da177e4 4303 now = jiffies;
b2db7564 4304 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4305
c15b1cca 4306 cancel_delayed_work(&addr_chk_work);
1da177e4 4307
bcdd553f 4308 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4309restart:
c15b1cca 4310 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 4311 unsigned long age;
1da177e4 4312
fad8da3e
YA		 4313 /* When setting preferred_lft to a value not zero or
4314 * infinity, while valid_lft is infinity
4315 * IFA_F_PERMANENT has a non-infinity life time.
4316 */
4317 if ((ifp->flags & IFA_F_PERMANENT) &&
4318 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4319 continue;
4320
4321 spin_lock(&ifp->lock);
b2db7564
YH		 4322 /* We try to batch several events at once. */
4323 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4324
8f27ebb9
YH		 4325 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4326 age >= ifp->valid_lft) {
1da177e4
LT		 4327 spin_unlock(&ifp->lock);
4328 in6_ifa_hold(ifp);
1da177e4
LT		 4329 ipv6_del_addr(ifp);
4330 goto restart;
8f27ebb9
YH		 4331 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4332 spin_unlock(&ifp->lock);
4333 continue;
1da177e4 4334 } else if (age >= ifp->prefered_lft) {
a1ed0526 4335 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4336 int deprecate = 0;
4337
4338 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4339 deprecate = 1;
4340 ifp->flags |= IFA_F_DEPRECATED;
4341 }
4342
fad8da3e
YA		 4343 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4344 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4345 next = ifp->tstamp + ifp->valid_lft * HZ;
4346
4347 spin_unlock(&ifp->lock);
4348
4349 if (deprecate) {
4350 in6_ifa_hold(ifp);
1da177e4
LT		 4351
4352 ipv6_ifa_notify(0, ifp);
4353 in6_ifa_put(ifp);
4354 goto restart;
4355 }
1da177e4
LT		 4356 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4357 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4358 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4359 ifp->idev->cnf.dad_transmits *
1f9248e5 4360 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 4361
1da177e4
LT		 4362 if (age >= ifp->prefered_lft - regen_advance) {
4363 struct inet6_ifaddr *ifpub = ifp->ifpub;
4364 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4365 next = ifp->tstamp + ifp->prefered_lft * HZ;
4366 if (!ifp->regen_count && ifpub) {
4367 ifp->regen_count++;
4368 in6_ifa_hold(ifp);
4369 in6_ifa_hold(ifpub);
4370 spin_unlock(&ifp->lock);
5c578aed 4371
291d809b
HY		 4372 spin_lock(&ifpub->lock);
4373 ifpub->regen_count = 0;
4374 spin_unlock(&ifpub->lock);
1da177e4
LT		 4375 ipv6_create_tempaddr(ifpub, ifp);
4376 in6_ifa_put(ifpub);
4377 in6_ifa_put(ifp);
4378 goto restart;
4379 }
4380 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4381 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4382 spin_unlock(&ifp->lock);
1da177e4
LT		 4383 } else {
4384 /* ifp->prefered_lft <= ifp->valid_lft */
4385 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4386 next = ifp->tstamp + ifp->prefered_lft * HZ;
4387 spin_unlock(&ifp->lock);
4388 }
4389 }
1da177e4
LT		 4390 }
4391
b2db7564
YH		 4392 next_sec = round_jiffies_up(next);
4393 next_sched = next;
4394
4395 /* If rounded timeout is accurate enough, accept it. */
4396 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4397 next_sched = next_sec;
4398
4399 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4400 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4401 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4402
ba3542e1 4403 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4404 now, next, next_sec, next_sched);
c15b1cca 4405 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4406 rcu_read_unlock_bh();
1da177e4
LT		 4407}
4408
c15b1cca
HFS		 4409static void addrconf_verify_work(struct work_struct *w)
4410{
4411 rtnl_lock();
4412 addrconf_verify_rtnl();
4413 rtnl_unlock();
4414}
4415
4416static void addrconf_verify(void)
4417{
4418 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4419}
4420
caeaba79
ND		 4421static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4422 struct in6_addr **peer_pfx)
461d8837
TG		 4423{
4424 struct in6_addr *pfx = NULL;
4425
caeaba79
ND		 4426 *peer_pfx = NULL;
4427
461d8837
TG		 4428 if (addr)
4429 pfx = nla_data(addr);
4430
4431 if (local) {
4432 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4433 *peer_pfx = pfx;
4434 pfx = nla_data(local);
461d8837
TG		 4435 }
4436
4437 return pfx;
4438}
4439
ef7c79ed 4440static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4441 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4442 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4443 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4444 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 4445};
4446
1da177e4 4447static int
c21ef3e3
DA		 4448inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4449 struct netlink_ext_ack *extack)
1da177e4 4450{
3b1e0a65 4451 struct net *net = sock_net(skb->sk);
b933f716
TG		 4452 struct ifaddrmsg *ifm;
4453 struct nlattr *tb[IFA_MAX+1];
caeaba79 4454 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4455 u32 ifa_flags;
b933f716 4456 int err;
1da177e4 4457
fceb6435 4458 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4459 extack);
b933f716
TG		 4460 if (err < 0)
4461 return err;
4462
4463 ifm = nlmsg_data(nlh);
caeaba79 4464 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4465 if (!pfx)
1da177e4
LT		 4466 return -EINVAL;
4467
6046d5b4
HK		 4468 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4469
4470 /* We ignore other flags so far. */
4471 ifa_flags &= IFA_F_MANAGETEMPADDR;
4472
4473 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4474 ifm->ifa_prefixlen);
1da177e4
LT		 4475}
4476
479840ff 4477static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 4478 u32 prefered_lft, u32 valid_lft)
081bba5b 4479{
6f704992
YH		 4480 u32 flags;
4481 clock_t expires;
4bed72e4 4482 unsigned long timeout;
53bd6749 4483 bool was_managetempaddr;
5b84efec 4484 bool had_prefixroute;
46d48046 4485
c15b1cca
HFS		 4486 ASSERT_RTNL();
4487
081bba5b
NT		 4488 if (!valid_lft || (prefered_lft > valid_lft))
4489 return -EINVAL;
4490
53bd6749
JP		 4491 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4492 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4493 return -EINVAL;
4494
4bed72e4
YH		 4495 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4496 if (addrconf_finite_timeout(timeout)) {
4497 expires = jiffies_to_clock_t(timeout * HZ);
4498 valid_lft = timeout;
6f704992 4499 flags = RTF_EXPIRES;
4bed72e4
YH		 4500 } else {
4501 expires = 0;
4502 flags = 0;
4503 ifa_flags |= IFA_F_PERMANENT;
6f704992 4504 }
081bba5b 4505
4bed72e4
YH		 4506 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4507 if (addrconf_finite_timeout(timeout)) {
4508 if (timeout == 0)
4509 ifa_flags |= IFA_F_DEPRECATED;
4510 prefered_lft = timeout;
4511 }
081bba5b
NT		 4512
4513 spin_lock_bh(&ifp->lock);
53bd6749 4514 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4515 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4516 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4517 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4518 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4519 IFA_F_NOPREFIXROUTE);
53bd6749 4520 ifp->flags |= ifa_flags;
081bba5b
NT		 4521 ifp->tstamp = jiffies;
4522 ifp->valid_lft = valid_lft;
4523 ifp->prefered_lft = prefered_lft;
4524
4525 spin_unlock_bh(&ifp->lock);
4526 if (!(ifp->flags&IFA_F_TENTATIVE))
4527 ipv6_ifa_notify(0, ifp);
081bba5b 4528
761aac73
TH		 4529 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4530 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4531 expires, flags);
5b84efec
TH		 4532 } else if (had_prefixroute) {
4533 enum cleanup_prefix_rt_t action;
4534 unsigned long rt_expires;
4535
4536 write_lock_bh(&ifp->idev->lock);
4537 action = check_cleanup_prefix_route(ifp, &rt_expires);
4538 write_unlock_bh(&ifp->idev->lock);
4539
4540 if (action != CLEANUP_PREFIX_RT_NOP) {
4541 cleanup_prefix_route(ifp, rt_expires,
4542 action == CLEANUP_PREFIX_RT_DEL);
4543 }
761aac73 4544 }
53bd6749
JP		 4545
4546 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4547 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4548 valid_lft = prefered_lft = 0;
4549 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4550 !was_managetempaddr, jiffies);
4551 }
4552
c15b1cca 4553 addrconf_verify_rtnl();
081bba5b
NT		 4554
4555 return 0;
4556}
4557
1da177e4 4558static int
c21ef3e3
DA		 4559inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4560 struct netlink_ext_ack *extack)
1da177e4 4561{
3b1e0a65 4562 struct net *net = sock_net(skb->sk);
461d8837
TG		 4563 struct ifaddrmsg *ifm;
4564 struct nlattr *tb[IFA_MAX+1];
caeaba79 4565 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 4566 struct inet6_ifaddr *ifa;
4567 struct net_device *dev;
55ebaef1 4568 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 4569 u32 ifa_flags;
461d8837 4570 int err;
1da177e4 4571
fceb6435 4572 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4573 extack);
461d8837
TG		 4574 if (err < 0)
4575 return err;
4576
4577 ifm = nlmsg_data(nlh);
caeaba79 4578 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4579 if (!pfx)
1da177e4
LT		 4580 return -EINVAL;
4581
461d8837 4582 if (tb[IFA_CACHEINFO]) {
0778769d 4583 struct ifa_cacheinfo *ci;
461d8837
TG		 4584
4585 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 4586 valid_lft = ci->ifa_valid;
461d8837
TG		 4587 preferred_lft = ci->ifa_prefered;
4588 } else {
4589 preferred_lft = INFINITY_LIFE_TIME;
4590 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 4591 }
4592
af284937 4593 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4594 if (!dev)
7198f8ce
TG		 4595 return -ENODEV;
4596
479840ff
JP		 4597 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4598
55ebaef1 4599 /* We ignore other flags so far. */
761aac73 4600 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
93a714d6 4601 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
55ebaef1 4602
1cab3da6 4603 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
63159f29 4604 if (!ifa) {
7198f8ce
TG		 4605 /*
4606 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4607 * userspace already relies on not having to provide this.
7198f8ce 4608 */
caeaba79 4609 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 4610 ifm->ifa_prefixlen, ifa_flags,
4611 preferred_lft, valid_lft);
081bba5b
NT		 4612 }
4613
7198f8ce
TG		 4614 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4615 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4616 err = -EEXIST;
4617 else
55ebaef1 4618 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 4619
4620 in6_ifa_put(ifa);
4621
4622 return err;
1da177e4
LT		 4623}
4624
479840ff 4625static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4626 u8 scope, int ifindex)
4627{
4628 struct ifaddrmsg *ifm;
4629
4630 ifm = nlmsg_data(nlh);
4631 ifm->ifa_family = AF_INET6;
4632 ifm->ifa_prefixlen = prefixlen;
4633 ifm->ifa_flags = flags;
4634 ifm->ifa_scope = scope;
4635 ifm->ifa_index = ifindex;
4636}
4637
85486af0
TG		 4638static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4639 unsigned long tstamp, u32 preferred, u32 valid)
4640{
4641 struct ifa_cacheinfo ci;
4642
18a31e1e
TG		 4643 ci.cstamp = cstamp_delta(cstamp);
4644 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4645 ci.ifa_prefered = preferred;
4646 ci.ifa_valid = valid;
4647
4648 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4649}
4650
101bb229
TG		 4651static inline int rt_scope(int ifa_scope)
4652{
4653 if (ifa_scope & IFA_HOST)
4654 return RT_SCOPE_HOST;
4655 else if (ifa_scope & IFA_LINK)
4656 return RT_SCOPE_LINK;
4657 else if (ifa_scope & IFA_SITE)
4658 return RT_SCOPE_SITE;
4659 else
4660 return RT_SCOPE_UNIVERSE;
4661}
4662
0ab6803b
TG		 4663static inline int inet6_ifaddr_msgsize(void)
4664{
339bf98f 4665 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4666 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4667 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4668 + nla_total_size(sizeof(struct ifa_cacheinfo))
4669 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4670}
c5396a31 4671
1da177e4 4672static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4673 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4674{
1da177e4 4675 struct nlmsghdr *nlh;
85486af0 4676 u32 preferred, valid;
1da177e4 4677
15e47304 4678 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4679 if (!nlh)
26932566 4680 return -EMSGSIZE;
0ab6803b 4681
101bb229
TG		 4682 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4683 ifa->idev->dev->ifindex);
4684
fad8da3e
YA		 4685 if (!((ifa->flags&IFA_F_PERMANENT) &&
4686 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4687 preferred = ifa->prefered_lft;
4688 valid = ifa->valid_lft;
4689 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4690 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4691 if (preferred > tval)
4692 preferred -= tval;
4693 else
4694 preferred = 0;
f56619fc
BH		 4695 if (valid != INFINITY_LIFE_TIME) {
4696 if (valid > tval)
4697 valid -= tval;
4698 else
4699 valid = 0;
4700 }
1da177e4
LT		 4701 }
4702 } else {
85486af0
TG		 4703 preferred = INFINITY_LIFE_TIME;
4704 valid = INFINITY_LIFE_TIME;
4705 }
4706
7996c799 4707 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4708 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4709 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4710 goto error;
4711 } else
930345ea 4712 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4713 goto error;
4714
4715 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4716 goto error;
1da177e4 4717
479840ff
JP		 4718 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4719 goto error;
4720
053c095a
JB		 4721 nlmsg_end(skb, nlh);
4722 return 0;
caeaba79
ND		 4723
4724error:
4725 nlmsg_cancel(skb, nlh);
4726 return -EMSGSIZE;
1da177e4
LT		 4727}
4728
4729static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4730 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4731{
1da177e4 4732 struct nlmsghdr *nlh;
101bb229
TG		 4733 u8 scope = RT_SCOPE_UNIVERSE;
4734 int ifindex = ifmca->idev->dev->ifindex;
4735
4736 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4737 scope = RT_SCOPE_SITE;
1da177e4 4738
15e47304 4739 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4740 if (!nlh)
26932566 4741 return -EMSGSIZE;
85486af0 4742
0ab6803b 4743 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4744 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4745 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4746 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4747 nlmsg_cancel(skb, nlh);
4748 return -EMSGSIZE;
4749 }
85486af0 4750
053c095a
JB		 4751 nlmsg_end(skb, nlh);
4752 return 0;
1da177e4
LT		 4753}
4754
4755static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4756 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4757{
1da177e4 4758 struct nlmsghdr *nlh;
101bb229
TG		 4759 u8 scope = RT_SCOPE_UNIVERSE;
4760 int ifindex = ifaca->aca_idev->dev->ifindex;
4761
4762 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4763 scope = RT_SCOPE_SITE;
1da177e4 4764
15e47304 4765 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4766 if (!nlh)
26932566 4767 return -EMSGSIZE;
85486af0 4768
0ab6803b 4769 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4770 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4771 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4772 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4773 nlmsg_cancel(skb, nlh);
4774 return -EMSGSIZE;
4775 }
1da177e4 4776
053c095a
JB		 4777 nlmsg_end(skb, nlh);
4778 return 0;
1da177e4
LT		 4779}
4780
e21e8467 4781enum addr_type_t {
1da177e4
LT		 4782 UNICAST_ADDR,
4783 MULTICAST_ADDR,
4784 ANYCAST_ADDR,
4785};
4786
234b27c3
ED		 4787/* called with rcu_read_lock() */
4788static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4789 struct netlink_callback *cb, enum addr_type_t type,
4790 int s_ip_idx, int *p_ip_idx)
4791{
234b27c3
ED		 4792 struct ifmcaddr6 *ifmca;
4793 struct ifacaddr6 *ifaca;
4794 int err = 1;
4795 int ip_idx = *p_ip_idx;
4796
4797 read_lock_bh(&idev->lock);
4798 switch (type) {
502a2ffd 4799 case UNICAST_ADDR: {
4800 struct inet6_ifaddr *ifa;
4801
234b27c3 4802 /* unicast address incl. temp addr */
502a2ffd 4803 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4804 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4805 continue;
4806 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4807 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4808 cb->nlh->nlmsg_seq,
4809 RTM_NEWADDR,
4810 NLM_F_MULTI);
053c095a 4811 if (err < 0)
234b27c3 4812 break;
63998ac2 4813 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4814 }
4815 break;
502a2ffd 4816 }
234b27c3
ED		 4817 case MULTICAST_ADDR:
4818 /* multicast address */
4819 for (ifmca = idev->mc_list; ifmca;
4820 ifmca = ifmca->next, ip_idx++) {
4821 if (ip_idx < s_ip_idx)
4822 continue;
4823 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4824 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4825 cb->nlh->nlmsg_seq,
4826 RTM_GETMULTICAST,
4827 NLM_F_MULTI);
053c095a 4828 if (err < 0)
234b27c3
ED		 4829 break;
4830 }
4831 break;
4832 case ANYCAST_ADDR:
4833 /* anycast address */
4834 for (ifaca = idev->ac_list; ifaca;
4835 ifaca = ifaca->aca_next, ip_idx++) {
4836 if (ip_idx < s_ip_idx)
4837 continue;
4838 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4839 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4840 cb->nlh->nlmsg_seq,
4841 RTM_GETANYCAST,
4842 NLM_F_MULTI);
053c095a 4843 if (err < 0)
234b27c3
ED		 4844 break;
4845 }
4846 break;
4847 default:
4848 break;
4849 }
4850 read_unlock_bh(&idev->lock);
4851 *p_ip_idx = ip_idx;
4852 return err;
4853}
4854
1da177e4
LT		 4855static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4856 enum addr_type_t type)
4857{
234b27c3
ED		 4858 struct net *net = sock_net(skb->sk);
4859 int h, s_h;
1da177e4
LT		 4860 int idx, ip_idx;
4861 int s_idx, s_ip_idx;
1da177e4 4862 struct net_device *dev;
234b27c3
ED		 4863 struct inet6_dev *idev;
4864 struct hlist_head *head;
1ab1457c 4865
234b27c3
ED		 4866 s_h = cb->args[0];
4867 s_idx = idx = cb->args[1];
4868 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4869
234b27c3 4870 rcu_read_lock();
63998ac2 4871 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4872 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4873 idx = 0;
4874 head = &net->dev_index_head[h];
b67bfe0d 4875 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4876 if (idx < s_idx)
4877 goto cont;
4b97efdf 4878 if (h > s_h || idx > s_idx)
234b27c3
ED		 4879 s_ip_idx = 0;
4880 ip_idx = 0;
e21e8467
SH		 4881 idev = __in6_dev_get(dev);
4882 if (!idev)
234b27c3
ED		 4883 goto cont;
4884
4885 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4886 s_ip_idx, &ip_idx) < 0)
234b27c3 4887 goto done;
7562f876 4888cont:
234b27c3
ED		 4889 idx++;
4890 }
1da177e4 4891 }
234b27c3
ED		 4892done:
4893 rcu_read_unlock();
4894 cb->args[0] = h;
4895 cb->args[1] = idx;
4896 cb->args[2] = ip_idx;
4897
1da177e4
LT		 4898 return skb->len;
4899}
4900
4901static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4902{
4903 enum addr_type_t type = UNICAST_ADDR;
b854272b 4904
1da177e4
LT		 4905 return inet6_dump_addr(skb, cb, type);
4906}
4907
4908static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4909{
4910 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4911
1da177e4
LT		 4912 return inet6_dump_addr(skb, cb, type);
4913}
4914
4915
4916static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4917{
4918 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4919
1da177e4
LT		 4920 return inet6_dump_addr(skb, cb, type);
4921}
4922
c21ef3e3
DA		 4923static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4924 struct netlink_ext_ack *extack)
6c223828 4925{
3b1e0a65 4926 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4927 struct ifaddrmsg *ifm;
4928 struct nlattr *tb[IFA_MAX+1];
caeaba79 4929 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4930 struct net_device *dev = NULL;
4931 struct inet6_ifaddr *ifa;
4932 struct sk_buff *skb;
6c223828
NT		 4933 int err;
4934
fceb6435 4935 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4936 extack);
1b29fc2c
TG		 4937 if (err < 0)
4938 goto errout;
4939
caeaba79 4940 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
63159f29 4941 if (!addr) {
1b29fc2c
TG		 4942 err = -EINVAL;
4943 goto errout;
6c223828 4944 }
6c223828 4945
1b29fc2c 4946 ifm = nlmsg_data(nlh);
6c223828 4947 if (ifm->ifa_index)
6fda7350 4948 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4949
e21e8467
SH		 4950 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4951 if (!ifa) {
1b29fc2c
TG		 4952 err = -EADDRNOTAVAIL;
4953 goto errout;
4954 }
6c223828 4955
e21e8467
SH		 4956 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4957 if (!skb) {
6c223828 4958 err = -ENOBUFS;
1b29fc2c 4959 goto errout_ifa;
6c223828
NT		 4960 }
4961
15e47304 4962 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4963 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4964 if (err < 0) {
4965 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4966 WARN_ON(err == -EMSGSIZE);
4967 kfree_skb(skb);
4968 goto errout_ifa;
4969 }
15e47304 4970 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4971errout_ifa:
6c223828 4972 in6_ifa_put(ifa);
1b29fc2c 4973errout:
6c223828 4974 return err;
6c223828
NT		 4975}
4976
1da177e4
LT		 4977static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4978{
4979 struct sk_buff *skb;
c346dca1 4980 struct net *net = dev_net(ifa->idev->dev);
5d620266 4981 int err = -ENOBUFS;
1da177e4 4982
f784ad3d
MB		 4983 /* Don't send DELADDR notification for TENTATIVE address,
4984 * since NEWADDR notification is sent only after removing
a7b4a2cd 4985 * TENTATIVE flag, if DAD has not failed.
f784ad3d 4986 */
a7b4a2cd
MM		 4987 if (ifa->flags & IFA_F_TENTATIVE && !(ifa->flags & IFA_F_DADFAILED) &&
4988 event == RTM_DELADDR)
f784ad3d
MB		 4989 return;
4990
0ab6803b 4991 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 4992 if (!skb)
5d620266
TG		 4993 goto errout;
4994
4995 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4996 if (err < 0) {
4997 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4998 WARN_ON(err == -EMSGSIZE);
4999 kfree_skb(skb);
5000 goto errout;
5001 }
1ce85fe4
PNA		 5002 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5003 return;
5d620266
TG		 5004errout:
5005 if (err < 0)
6fda7350 5006 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 5007}
5008
b6f99a21 5009static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 5010 __s32 *array, int bytes)
5011{
04561c1f
TG		 5012 BUG_ON(bytes < (DEVCONF_MAX * 4));
5013
1da177e4
LT		 5014 memset(array, 0, bytes);
5015 array[DEVCONF_FORWARDING] = cnf->forwarding;
5016 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5017 array[DEVCONF_MTU6] = cnf->mtu6;
5018 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5019 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5020 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5021 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5022 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 5023 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5024 jiffies_to_msecs(cnf->rtr_solicit_interval);
bd11f074
MŻ		 5025 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5026 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
93908d19
TG		 5027 array[DEVCONF_RTR_SOLICIT_DELAY] =
5028 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 5029 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 5030 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5031 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5032 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5033 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 5034 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5035 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5036 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5037 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5038 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 5039 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 5040 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 5041 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 5042 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 5043#ifdef CONFIG_IPV6_ROUTER_PREF
5044 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 5045 array[DEVCONF_RTR_PROBE_INTERVAL] =
5046 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 5047#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 5048 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
09c884d4
YH		 5049 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5050#endif
930d6ff2 5051#endif
fbea49e1 5052 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 5053 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 5054#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5055 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 5056 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 5057#endif
7bc570c8
YH		 5058#ifdef CONFIG_IPV6_MROUTE
5059 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5060#endif
778d80be 5061 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 5062 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 5063 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 5064 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 5065 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 5066 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 5067 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 5068 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 5069 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 5070 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 5071 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 5072 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 5073 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1ababeba 5074 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
bf355b8d
DL		 5075#ifdef CONFIG_IPV6_SEG6_HMAC
5076 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5077#endif
adc176c5 5078 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
d35a00b8 5079 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
df789fe7 5080 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
1da177e4
LT		 5081}
5082
b382b191
TG		 5083static inline size_t inet6_ifla6_size(void)
5084{
5085 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5086 + nla_total_size(sizeof(struct ifla_cacheinfo))
5087 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5088 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 5089 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5090 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 5091}
5092
339bf98f
TG		 5093static inline size_t inet6_if_nlmsg_size(void)
5094{
5095 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5096 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5097 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5098 + nla_total_size(4) /* IFLA_MTU */
5099 + nla_total_size(4) /* IFLA_LINK */
0344338b 5100 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 5101 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 5102}
c5396a31 5103
be281e55 5104static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
aca05671 5105 int bytes)
7f7d9a6b
HX		 5106{
5107 int i;
aca05671 5108 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
7f7d9a6b
HX		 5109 BUG_ON(pad < 0);
5110
5111 /* Use put_unaligned() because stats may not be aligned for u64. */
aca05671
JH		 5112 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5113 for (i = 1; i < ICMP6_MIB_MAX; i++)
be281e55 5114 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b 5115
aca05671 5116 memset(&stats[ICMP6_MIB_MAX], 0, pad);
7f7d9a6b
HX		 5117}
5118
698365fa 5119static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 5120 int bytes, size_t syncpoff)
4ce3c183 5121{
a3a77372
R		 5122 int i, c;
5123 u64 buff[IPSTATS_MIB_MAX];
5124 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5125
4ce3c183
ED		 5126 BUG_ON(pad < 0);
5127
a3a77372
R		 5128 memset(buff, 0, sizeof(buff));
5129 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 5130
a3a77372
R		 5131 for_each_possible_cpu(c) {
5132 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5133 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5134 }
5135
5136 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5137 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 5138}
5139
7f7d9a6b
HX		 5140static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5141 int bytes)
5142{
e21e8467 5143 switch (attrtype) {
7f7d9a6b 5144 case IFLA_INET6_STATS:
a3a77372
R		 5145 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5146 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 5147 break;
5148 case IFLA_INET6_ICMP6STATS:
aca05671 5149 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
7f7d9a6b
HX		 5150 break;
5151 }
5152}
5153
d5566fd7
SV		 5154static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5155 u32 ext_filter_mask)
b382b191
TG		 5156{
5157 struct nlattr *nla;
5158 struct ifla_cacheinfo ci;
5159
c78679e8
DM		 5160 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5161 goto nla_put_failure;
b382b191 5162 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 5163 ci.tstamp = cstamp_delta(idev->tstamp);
5164 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 5165 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 5166 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5167 goto nla_put_failure;
b382b191 5168 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 5169 if (!nla)
b382b191
TG		 5170 goto nla_put_failure;
5171 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5172
5173 /* XXX - MC not implemented */
5174
d5566fd7
SV		 5175 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5176 return 0;
5177
b382b191 5178 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 5179 if (!nla)
b382b191
TG		 5180 goto nla_put_failure;
5181 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5182
5183 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 5184 if (!nla)
b382b191
TG		 5185 goto nla_put_failure;
5186 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5187
f53adae4 5188 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 5189 if (!nla)
f53adae4 5190 goto nla_put_failure;
bc91b0f0 5191
d35a00b8 5192 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
bc91b0f0
JP		 5193 goto nla_put_failure;
5194
f53adae4
DB		 5195 read_lock_bh(&idev->lock);
5196 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5197 read_unlock_bh(&idev->lock);
5198
b382b191
TG		 5199 return 0;
5200
5201nla_put_failure:
5202 return -EMSGSIZE;
5203}
5204
b1974ed0
AR		 5205static size_t inet6_get_link_af_size(const struct net_device *dev,
5206 u32 ext_filter_mask)
b382b191
TG		 5207{
5208 if (!__in6_dev_get(dev))
5209 return 0;
5210
5211 return inet6_ifla6_size();
5212}
5213
d5566fd7
SV		 5214static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5215 u32 ext_filter_mask)
b382b191
TG		 5216{
5217 struct inet6_dev *idev = __in6_dev_get(dev);
5218
5219 if (!idev)
5220 return -ENODATA;
5221
d5566fd7 5222 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5223 return -EMSGSIZE;
5224
5225 return 0;
5226}
5227
f53adae4
DB		 5228static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5229{
f53adae4
DB		 5230 struct inet6_ifaddr *ifp;
5231 struct net_device *dev = idev->dev;
47e27d5e 5232 bool clear_token, update_rs = false;
dc848292 5233 struct in6_addr ll_addr;
f53adae4 5234
c15b1cca
HFS		 5235 ASSERT_RTNL();
5236
63159f29 5237 if (!token)
f53adae4 5238 return -EINVAL;
f53adae4
DB		 5239 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5240 return -EINVAL;
f53adae4
DB		 5241 if (!ipv6_accept_ra(idev))
5242 return -EINVAL;
bd11f074 5243 if (idev->cnf.rtr_solicits == 0)
f53adae4
DB		 5244 return -EINVAL;
5245
5246 write_lock_bh(&idev->lock);
5247
5248 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5249 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5250
5251 write_unlock_bh(&idev->lock);
5252
47e27d5e
DB		 5253 clear_token = ipv6_addr_any(token);
5254 if (clear_token)
5255 goto update_lft;
5256
dc848292
HFS		 5257 if (!idev->dead && (idev->if_flags & IF_READY) &&
5258 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5259 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5260 /* If we're not ready, then normal ifup will take care
5261 * of this. Otherwise, we need to request our rs here.
5262 */
5263 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5264 update_rs = true;
5265 }
f53adae4 5266
47e27d5e 5267update_lft:
f53adae4 5268 write_lock_bh(&idev->lock);
fc403832 5269
77ecaace 5270 if (update_rs) {
fc403832 5271 idev->if_flags |= IF_RS_SENT;
bd11f074
MŻ		 5272 idev->rs_interval = rfc3315_s14_backoff_init(
5273 idev->cnf.rtr_solicit_interval);
77ecaace 5274 idev->rs_probes = 1;
bd11f074 5275 addrconf_mod_rs_timer(idev, idev->rs_interval);
77ecaace 5276 }
f53adae4
DB		 5277
5278 /* Well, that's kinda nasty ... */
5279 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5280 spin_lock(&ifp->lock);
617fe29d 5281 if (ifp->tokenized) {
f53adae4
DB		 5282 ifp->valid_lft = 0;
5283 ifp->prefered_lft = 0;
5284 }
5285 spin_unlock(&ifp->lock);
5286 }
5287
5288 write_unlock_bh(&idev->lock);
b2ed64a9 5289 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 5290 addrconf_verify_rtnl();
f53adae4
DB		 5291 return 0;
5292}
5293
11b1f828
DB		 5294static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5295 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5296 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5297};
5298
5299static int inet6_validate_link_af(const struct net_device *dev,
5300 const struct nlattr *nla)
5301{
5302 struct nlattr *tb[IFLA_INET6_MAX + 1];
5303
5304 if (dev && !__in6_dev_get(dev))
5305 return -EAFNOSUPPORT;
5306
fceb6435
JB		 5307 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5308 NULL);
11b1f828
DB		 5309}
5310
d35a00b8
FJ		 5311static int check_addr_gen_mode(int mode)
5312{
5313 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5314 mode != IN6_ADDR_GEN_MODE_NONE &&
5315 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5316 mode != IN6_ADDR_GEN_MODE_RANDOM)
5317 return -EINVAL;
5318 return 1;
5319}
5320
5321static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5322 int mode)
5323{
5324 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5325 !idev->cnf.stable_secret.initialized &&
5326 !net->ipv6.devconf_dflt->stable_secret.initialized)
5327 return -EINVAL;
5328 return 1;
5329}
5330
f53adae4
DB		 5331static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5332{
5333 int err = -EINVAL;
5334 struct inet6_dev *idev = __in6_dev_get(dev);
5335 struct nlattr *tb[IFLA_INET6_MAX + 1];
5336
5337 if (!idev)
5338 return -EAFNOSUPPORT;
5339
fceb6435 5340 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
f53adae4
DB		 5341 BUG();
5342
bc91b0f0 5343 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 5344 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 5345 if (err)
5346 return err;
5347 }
5348
5349 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5350 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5351
d35a00b8
FJ		 5352 if (check_addr_gen_mode(mode) < 0 ||
5353 check_stable_privacy(idev, dev_net(dev), mode) < 0)
bc91b0f0 5354 return -EINVAL;
622c81d5 5355
d35a00b8 5356 idev->cnf.addr_gen_mode = mode;
bc91b0f0
JP		 5357 err = 0;
5358 }
f53adae4
DB		 5359
5360 return err;
5361}
5362
1ab1457c 5363static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5364 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5365{
04561c1f 5366 struct net_device *dev = idev->dev;
04561c1f
TG		 5367 struct ifinfomsg *hdr;
5368 struct nlmsghdr *nlh;
5369 void *protoinfo;
04561c1f 5370
15e47304 5371 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5372 if (!nlh)
26932566 5373 return -EMSGSIZE;
04561c1f
TG		 5374
5375 hdr = nlmsg_data(nlh);
5376 hdr->ifi_family = AF_INET6;
5377 hdr->__ifi_pad = 0;
5378 hdr->ifi_type = dev->type;
5379 hdr->ifi_index = dev->ifindex;
5380 hdr->ifi_flags = dev_get_flags(dev);
5381 hdr->ifi_change = 0;
5382
c78679e8
DM		 5383 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5384 (dev->addr_len &&
5385 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5386 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5387 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5388 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5389 nla_put_u8(skb, IFLA_OPERSTATE,
5390 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5391 goto nla_put_failure;
04561c1f 5392 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 5393 if (!protoinfo)
04561c1f 5394 goto nla_put_failure;
1da177e4 5395
d5566fd7 5396 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5397 goto nla_put_failure;
1da177e4 5398
04561c1f 5399 nla_nest_end(skb, protoinfo);
053c095a
JB		 5400 nlmsg_end(skb, nlh);
5401 return 0;
1da177e4 5402
04561c1f 5403nla_put_failure:
26932566
PM		 5404 nlmsg_cancel(skb, nlh);
5405 return -EMSGSIZE;
1da177e4
LT		 5406}
5407
5408static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5409{
3b1e0a65 5410 struct net *net = sock_net(skb->sk);
84d2697d 5411 int h, s_h;
434a8a58 5412 int idx = 0, s_idx;
1da177e4
LT		 5413 struct net_device *dev;
5414 struct inet6_dev *idev;
84d2697d 5415 struct hlist_head *head;
1da177e4 5416
84d2697d
ED		 5417 s_h = cb->args[0];
5418 s_idx = cb->args[1];
5419
5420 rcu_read_lock();
5421 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5422 idx = 0;
5423 head = &net->dev_index_head[h];
b67bfe0d 5424 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5425 if (idx < s_idx)
5426 goto cont;
5427 idev = __in6_dev_get(dev);
5428 if (!idev)
5429 goto cont;
5430 if (inet6_fill_ifinfo(skb, idev,
15e47304 5431 NETLINK_CB(cb->skb).portid,
84d2697d 5432 cb->nlh->nlmsg_seq,
053c095a 5433 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5434 goto out;
7562f876 5435cont:
84d2697d
ED		 5436 idx++;
5437 }
1da177e4 5438 }
84d2697d
ED		 5439out:
5440 rcu_read_unlock();
5441 cb->args[1] = idx;
5442 cb->args[0] = h;
1da177e4
LT		 5443
5444 return skb->len;
5445}
5446
5447void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5448{
5449 struct sk_buff *skb;
c346dca1 5450 struct net *net = dev_net(idev->dev);
8d7a76c9 5451 int err = -ENOBUFS;
1ab1457c 5452
339bf98f 5453 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5454 if (!skb)
8d7a76c9
TG		 5455 goto errout;
5456
5457 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5458 if (err < 0) {
5459 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5460 WARN_ON(err == -EMSGSIZE);
5461 kfree_skb(skb);
5462 goto errout;
5463 }
5f75a104 5464 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5465 return;
8d7a76c9
TG		 5466errout:
5467 if (err < 0)
5f75a104 5468 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5469}
5470
339bf98f
TG		 5471static inline size_t inet6_prefix_nlmsg_size(void)
5472{
5473 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5474 + nla_total_size(sizeof(struct in6_addr))
5475 + nla_total_size(sizeof(struct prefix_cacheinfo));
5476}
c5396a31 5477
1da177e4 5478static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5479 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5480 int event, unsigned int flags)
1da177e4 5481{
6051e2f4
TG		 5482 struct prefixmsg *pmsg;
5483 struct nlmsghdr *nlh;
1da177e4
LT		 5484 struct prefix_cacheinfo ci;
5485
15e47304 5486 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5487 if (!nlh)
26932566 5488 return -EMSGSIZE;
6051e2f4
TG		 5489
5490 pmsg = nlmsg_data(nlh);
1da177e4 5491 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5492 pmsg->prefix_pad1 = 0;
5493 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5494 pmsg->prefix_ifindex = idev->dev->ifindex;
5495 pmsg->prefix_len = pinfo->prefix_len;
5496 pmsg->prefix_type = pinfo->type;
8a47077a 5497 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5498 pmsg->prefix_flags = 0;
5499 if (pinfo->onlink)
5500 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5501 if (pinfo->autoconf)
5502 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5503
c78679e8
DM		 5504 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5505 goto nla_put_failure;
1da177e4
LT		 5506 ci.preferred_time = ntohl(pinfo->prefered);
5507 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5508 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5509 goto nla_put_failure;
053c095a
JB		 5510 nlmsg_end(skb, nlh);
5511 return 0;
1da177e4 5512
6051e2f4 5513nla_put_failure:
26932566
PM		 5514 nlmsg_cancel(skb, nlh);
5515 return -EMSGSIZE;
1da177e4
LT		 5516}
5517
1ab1457c 5518static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5519 struct prefix_info *pinfo)
5520{
5521 struct sk_buff *skb;
c346dca1 5522 struct net *net = dev_net(idev->dev);
8c384bfa 5523 int err = -ENOBUFS;
1da177e4 5524
339bf98f 5525 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5526 if (!skb)
8c384bfa
TG		 5527 goto errout;
5528
5529 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5530 if (err < 0) {
5531 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5532 WARN_ON(err == -EMSGSIZE);
5533 kfree_skb(skb);
5534 goto errout;
5535 }
1ce85fe4
PNA		 5536 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5537 return;
8c384bfa
TG		 5538errout:
5539 if (err < 0)
6fda7350 5540 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5541}
5542
1da177e4
LT		 5543static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5544{
63998ac2
ND		 5545 struct net *net = dev_net(ifp->idev->dev);
5546
c15b1cca
HFS		 5547 if (event)
5548 ASSERT_RTNL();
5549
1da177e4
LT		 5550 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5551
5552 switch (event) {
5553 case RTM_NEWADDR:
95c385b4
NH		 5554 /*
5555 * If the address was optimistic
5556 * we inserted the route at the start of
5557 * our DAD process, so we don't need
5558 * to do it again
5559 */
4e587ea7 5560 if (!rcu_access_pointer(ifp->rt->rt6i_node))
95c385b4 5561 ip6_ins_rt(ifp->rt);
1da177e4
LT		 5562 if (ifp->idev->cnf.forwarding)
5563 addrconf_join_anycast(ifp);
7996c799 5564 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 5565 addrconf_prefix_route(&ifp->peer_addr, 128,
5566 ifp->idev->dev, 0, 0);
1da177e4
LT		 5567 break;
5568 case RTM_DELADDR:
5569 if (ifp->idev->cnf.forwarding)
5570 addrconf_leave_anycast(ifp);
5571 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5572 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 5573 struct rt6_info *rt;
caeaba79 5574
e7478dfc
ND		 5575 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5576 ifp->idev->dev, 0, 0);
8e3d5be7
MKL		 5577 if (rt)
5578 ip6_del_rt(rt);
caeaba79 5579 }
38bd10c4 5580 if (ifp->rt) {
ad65a2f0
WW		 5581 if (dst_hold_safe(&ifp->rt->dst))
5582 ip6_del_rt(ifp->rt);
38bd10c4 5583 }
705f1c86 5584 rt_genid_bump_ipv6(net);
1da177e4
LT		 5585 break;
5586 }
63998ac2 5587 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5588}
5589
5590static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5591{
8814c4b5 5592 rcu_read_lock_bh();
1da177e4
LT		 5593 if (likely(ifp->idev->dead == 0))
5594 __ipv6_ifa_notify(event, ifp);
8814c4b5 5595 rcu_read_unlock_bh();
1da177e4
LT		 5596}
5597
5598#ifdef CONFIG_SYSCTL
5599
5600static
fe2c6338 5601int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5602 void __user *buffer, size_t *lenp, loff_t *ppos)
5603{
5604 int *valp = ctl->data;
5605 int val = *valp;
88af182e 5606 loff_t pos = *ppos;
fe2c6338 5607 struct ctl_table lctl;
1da177e4
LT		 5608 int ret;
5609
013d97e9
FR		 5610 /*
5611 * ctl->data points to idev->cnf.forwarding, we should
5612 * not modify it until we get the rtnl lock.
5613 */
5614 lctl = *ctl;
5615 lctl.data = &val;
5616
5617 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5618
c8fecf22 5619 if (write)
b325fddb 5620 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5621 if (ret)
5622 *ppos = pos;
1ab1457c 5623 return ret;
1da177e4
LT		 5624}
5625
77751427
ML		 5626static
5627int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5628 void __user *buffer, size_t *lenp, loff_t *ppos)
5629{
5630 struct inet6_dev *idev = ctl->extra1;
5631 int min_mtu = IPV6_MIN_MTU;
5632 struct ctl_table lctl;
5633
5634 lctl = *ctl;
5635 lctl.extra1 = &min_mtu;
5636 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5637
5638 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5639}
5640
56d417b1
BH		 5641static void dev_disable_change(struct inet6_dev *idev)
5642{
75538c2b
CW		 5643 struct netdev_notifier_info info;
5644
56d417b1
BH		 5645 if (!idev || !idev->dev)
5646 return;
5647
75538c2b 5648 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5649 if (idev->cnf.disable_ipv6)
75538c2b 5650 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5651 else
75538c2b 5652 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5653}
5654
5655static void addrconf_disable_change(struct net *net, __s32 newf)
5656{
5657 struct net_device *dev;
5658 struct inet6_dev *idev;
5659
03e4deff 5660 for_each_netdev(net, dev) {
56d417b1
BH		 5661 idev = __in6_dev_get(dev);
5662 if (idev) {
5663 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5664 idev->cnf.disable_ipv6 = newf;
5665 if (changed)
5666 dev_disable_change(idev);
5667 }
56d417b1 5668 }
56d417b1
BH		 5669}
5670
013d97e9 5671static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5672{
5673 struct net *net;
013d97e9
FR		 5674 int old;
5675
5676 if (!rtnl_trylock())
5677 return restart_syscall();
56d417b1
BH		 5678
5679 net = (struct net *)table->extra2;
013d97e9
FR		 5680 old = *p;
5681 *p = newf;
56d417b1 5682
013d97e9
FR		 5683 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5684 rtnl_unlock();
56d417b1 5685 return 0;
88af182e 5686 }
56d417b1
BH		 5687
5688 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5689 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5690 addrconf_disable_change(net, newf);
013d97e9 5691 } else if ((!newf) ^ (!old))
56d417b1
BH		 5692 dev_disable_change((struct inet6_dev *)table->extra1);
5693
5694 rtnl_unlock();
5695 return 0;
5696}
5697
5698static
fe2c6338 5699int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5700 void __user *buffer, size_t *lenp, loff_t *ppos)
5701{
5702 int *valp = ctl->data;
5703 int val = *valp;
88af182e 5704 loff_t pos = *ppos;
fe2c6338 5705 struct ctl_table lctl;
56d417b1
BH		 5706 int ret;
5707
013d97e9
FR		 5708 /*
5709 * ctl->data points to idev->cnf.disable_ipv6, we should
5710 * not modify it until we get the rtnl lock.
5711 */
5712 lctl = *ctl;
5713 lctl.data = &val;
5714
5715 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5716
5717 if (write)
5718 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5719 if (ret)
5720 *ppos = pos;
56d417b1
BH		 5721 return ret;
5722}
5723
c92d5491 5724static
5725int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5726 void __user *buffer, size_t *lenp, loff_t *ppos)
5727{
5728 int *valp = ctl->data;
5729 int ret;
5730 int old, new;
5731
5732 old = *valp;
5733 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5734 new = *valp;
5735
5736 if (write && old != new) {
5737 struct net *net = ctl->extra2;
5738
5739 if (!rtnl_trylock())
5740 return restart_syscall();
5741
5742 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
85b3daad
DA		 5743 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5744 NETCONFA_PROXY_NEIGH,
c92d5491 5745 NETCONFA_IFINDEX_DEFAULT,
5746 net->ipv6.devconf_dflt);
5747 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
85b3daad
DA		 5748 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5749 NETCONFA_PROXY_NEIGH,
c92d5491 5750 NETCONFA_IFINDEX_ALL,
5751 net->ipv6.devconf_all);
5752 else {
5753 struct inet6_dev *idev = ctl->extra1;
5754
85b3daad
DA		 5755 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5756 NETCONFA_PROXY_NEIGH,
c92d5491 5757 idev->dev->ifindex,
5758 &idev->cnf);
5759 }
5760 rtnl_unlock();
5761 }
5762
5763 return ret;
5764}
5765
d35a00b8
FJ		 5766static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5767 void __user *buffer, size_t *lenp,
5768 loff_t *ppos)
5769{
5770 int ret = 0;
5771 int new_val;
5772 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5773 struct net *net = (struct net *)ctl->extra2;
5774
8c171d6c
FJ		 5775 if (!rtnl_trylock())
5776 return restart_syscall();
5777
d35a00b8
FJ		 5778 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5779
5780 if (write) {
5781 new_val = *((int *)ctl->data);
5782
8c171d6c
FJ		 5783 if (check_addr_gen_mode(new_val) < 0) {
5784 ret = -EINVAL;
5785 goto out;
5786 }
d35a00b8
FJ		 5787
5788 /* request for default */
5789 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5790 ipv6_devconf_dflt.addr_gen_mode = new_val;
5791
5792 /* request for individual net device */
5793 } else {
5794 if (!idev)
8c171d6c 5795 goto out;
d35a00b8 5796
8c171d6c
FJ		 5797 if (check_stable_privacy(idev, net, new_val) < 0) {
5798 ret = -EINVAL;
5799 goto out;
5800 }
d35a00b8
FJ		 5801
5802 if (idev->cnf.addr_gen_mode != new_val) {
5803 idev->cnf.addr_gen_mode = new_val;
d35a00b8 5804 addrconf_dev_config(idev->dev);
d35a00b8
FJ		 5805 }
5806 }
5807 }
5808
8c171d6c
FJ		 5809out:
5810 rtnl_unlock();
5811
d35a00b8
FJ		 5812 return ret;
5813}
5814
3d1bec99
HFS		 5815static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5816 void __user *buffer, size_t *lenp,
5817 loff_t *ppos)
5818{
5819 int err;
5820 struct in6_addr addr;
5821 char str[IPV6_MAX_STRLEN];
5822 struct ctl_table lctl = *ctl;
622c81d5 5823 struct net *net = ctl->extra2;
3d1bec99
HFS		 5824 struct ipv6_stable_secret *secret = ctl->data;
5825
622c81d5
HFS		 5826 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5827 return -EIO;
5828
3d1bec99
HFS		 5829 lctl.maxlen = IPV6_MAX_STRLEN;
5830 lctl.data = str;
5831
5832 if (!rtnl_trylock())
5833 return restart_syscall();
5834
5835 if (!write && !secret->initialized) {
5836 err = -EIO;
5837 goto out;
5838 }
5839
5449a5ca
WC		 5840 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5841 if (err >= sizeof(str)) {
5842 err = -EIO;
5843 goto out;
3d1bec99
HFS		 5844 }
5845
5846 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5847 if (err || !write)
5848 goto out;
5849
5850 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5851 err = -EIO;
5852 goto out;
5853 }
5854
5855 secret->initialized = true;
5856 secret->secret = addr;
5857
622c81d5
HFS		 5858 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5859 struct net_device *dev;
5860
5861 for_each_netdev(net, dev) {
5862 struct inet6_dev *idev = __in6_dev_get(dev);
5863
5864 if (idev) {
d35a00b8 5865 idev->cnf.addr_gen_mode =
622c81d5
HFS		 5866 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5867 }
5868 }
5869 } else {
5870 struct inet6_dev *idev = ctl->extra1;
5871
d35a00b8 5872 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
622c81d5
HFS		 5873 }
5874
3d1bec99
HFS		 5875out:
5876 rtnl_unlock();
5877
5878 return err;
5879}
c92d5491 5880
35103d11
AG		 5881static
5882int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5883 int write,
5884 void __user *buffer,
5885 size_t *lenp,
5886 loff_t *ppos)
5887{
5888 int *valp = ctl->data;
5889 int val = *valp;
5890 loff_t pos = *ppos;
5891 struct ctl_table lctl;
5892 int ret;
5893
5894 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5895 * we should not modify it until we get the rtnl lock.
5896 */
5897 lctl = *ctl;
5898 lctl.data = &val;
5899
5900 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5901
5902 if (write)
5903 ret = addrconf_fixup_linkdown(ctl, valp, val);
5904 if (ret)
5905 *ppos = pos;
5906 return ret;
5907}
5908
df789fe7
DF		 5909static
5910void addrconf_set_nopolicy(struct rt6_info *rt, int action)
5911{
5912 if (rt) {
5913 if (action)
5914 rt->dst.flags |= DST_NOPOLICY;
5915 else
5916 rt->dst.flags &= ~DST_NOPOLICY;
5917 }
5918}
5919
5920static
5921void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
5922{
5923 struct inet6_ifaddr *ifa;
5924
5925 read_lock_bh(&idev->lock);
5926 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5927 spin_lock(&ifa->lock);
5928 if (ifa->rt) {
5929 struct rt6_info *rt = ifa->rt;
5930 struct fib6_table *table = rt->rt6i_table;
5931 int cpu;
5932
5933 read_lock(&table->tb6_lock);
5934 addrconf_set_nopolicy(ifa->rt, val);
5935 if (rt->rt6i_pcpu) {
5936 for_each_possible_cpu(cpu) {
5937 struct rt6_info **rtp;
5938
5939 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
5940 addrconf_set_nopolicy(*rtp, val);
5941 }
5942 }
5943 read_unlock(&table->tb6_lock);
5944 }
5945 spin_unlock(&ifa->lock);
5946 }
5947 read_unlock_bh(&idev->lock);
5948}
5949
5950static
5951int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
5952{
5953 struct inet6_dev *idev;
5954 struct net *net;
5955
5956 if (!rtnl_trylock())
5957 return restart_syscall();
5958
5959 *valp = val;
5960
5961 net = (struct net *)ctl->extra2;
5962 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
5963 rtnl_unlock();
5964 return 0;
5965 }
5966
5967 if (valp == &net->ipv6.devconf_all->disable_policy) {
5968 struct net_device *dev;
5969
5970 for_each_netdev(net, dev) {
5971 idev = __in6_dev_get(dev);
5972 if (idev)
5973 addrconf_disable_policy_idev(idev, val);
5974 }
5975 } else {
5976 idev = (struct inet6_dev *)ctl->extra1;
5977 addrconf_disable_policy_idev(idev, val);
5978 }
5979
5980 rtnl_unlock();
5981 return 0;
5982}
5983
5984static
5985int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
5986 void __user *buffer, size_t *lenp,
5987 loff_t *ppos)
5988{
5989 int *valp = ctl->data;
5990 int val = *valp;
5991 loff_t pos = *ppos;
5992 struct ctl_table lctl;
5993 int ret;
5994
5995 lctl = *ctl;
5996 lctl.data = &val;
5997 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5998
5999 if (write && (*valp != val))
6000 ret = addrconf_disable_policy(ctl, valp, val);
6001
6002 if (ret)
6003 *ppos = pos;
6004
6005 return ret;
6006}
6007
cb4a4c69 6008static int minus_one = -1;
cb9e684e
MŻ		 6009static const int one = 1;
6010static const int two_five_five = 255;
6011
607ea7cd 6012static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 6013 {
6014 .procname = "forwarding",
6015 .data = &ipv6_devconf.forwarding,
6016 .maxlen = sizeof(int),
6017 .mode = 0644,
6018 .proc_handler = addrconf_sysctl_forward,
6019 },
6020 {
6021 .procname = "hop_limit",
6022 .data = &ipv6_devconf.hop_limit,
6023 .maxlen = sizeof(int),
6024 .mode = 0644,
cb9e684e
MŻ		 6025 .proc_handler = proc_dointvec_minmax,
6026 .extra1 = (void *)&one,
6027 .extra2 = (void *)&two_five_five,
5df1f77f
KK		 6028 },
6029 {
6030 .procname = "mtu",
6031 .data = &ipv6_devconf.mtu6,
6032 .maxlen = sizeof(int),
6033 .mode = 0644,
6034 .proc_handler = addrconf_sysctl_mtu,
6035 },
6036 {
6037 .procname = "accept_ra",
6038 .data = &ipv6_devconf.accept_ra,
6039 .maxlen = sizeof(int),
6040 .mode = 0644,
6041 .proc_handler = proc_dointvec,
6042 },
6043 {
6044 .procname = "accept_redirects",
6045 .data = &ipv6_devconf.accept_redirects,
6046 .maxlen = sizeof(int),
6047 .mode = 0644,
6048 .proc_handler = proc_dointvec,
6049 },
6050 {
6051 .procname = "autoconf",
6052 .data = &ipv6_devconf.autoconf,
6053 .maxlen = sizeof(int),
6054 .mode = 0644,
6055 .proc_handler = proc_dointvec,
6056 },
6057 {
6058 .procname = "dad_transmits",
6059 .data = &ipv6_devconf.dad_transmits,
6060 .maxlen = sizeof(int),
6061 .mode = 0644,
6062 .proc_handler = proc_dointvec,
6063 },
6064 {
6065 .procname = "router_solicitations",
6066 .data = &ipv6_devconf.rtr_solicits,
6067 .maxlen = sizeof(int),
6068 .mode = 0644,
cb4a4c69
MŻ		 6069 .proc_handler = proc_dointvec_minmax,
6070 .extra1 = &minus_one,
5df1f77f
KK		 6071 },
6072 {
6073 .procname = "router_solicitation_interval",
6074 .data = &ipv6_devconf.rtr_solicit_interval,
6075 .maxlen = sizeof(int),
6076 .mode = 0644,
6077 .proc_handler = proc_dointvec_jiffies,
6078 },
bd11f074
MŻ		 6079 {
6080 .procname = "router_solicitation_max_interval",
6081 .data = &ipv6_devconf.rtr_solicit_max_interval,
6082 .maxlen = sizeof(int),
6083 .mode = 0644,
6084 .proc_handler = proc_dointvec_jiffies,
6085 },
5df1f77f
KK		 6086 {
6087 .procname = "router_solicitation_delay",
6088 .data = &ipv6_devconf.rtr_solicit_delay,
6089 .maxlen = sizeof(int),
6090 .mode = 0644,
6091 .proc_handler = proc_dointvec_jiffies,
6092 },
6093 {
6094 .procname = "force_mld_version",
6095 .data = &ipv6_devconf.force_mld_version,
6096 .maxlen = sizeof(int),
6097 .mode = 0644,
6098 .proc_handler = proc_dointvec,
6099 },
6100 {
6101 .procname = "mldv1_unsolicited_report_interval",
6102 .data =
6103 &ipv6_devconf.mldv1_unsolicited_report_interval,
6104 .maxlen = sizeof(int),
6105 .mode = 0644,
6106 .proc_handler = proc_dointvec_ms_jiffies,
6107 },
6108 {
6109 .procname = "mldv2_unsolicited_report_interval",
6110 .data =
6111 &ipv6_devconf.mldv2_unsolicited_report_interval,
6112 .maxlen = sizeof(int),
6113 .mode = 0644,
6114 .proc_handler = proc_dointvec_ms_jiffies,
6115 },
6116 {
6117 .procname = "use_tempaddr",
6118 .data = &ipv6_devconf.use_tempaddr,
6119 .maxlen = sizeof(int),
6120 .mode = 0644,
6121 .proc_handler = proc_dointvec,
6122 },
6123 {
6124 .procname = "temp_valid_lft",
6125 .data = &ipv6_devconf.temp_valid_lft,
6126 .maxlen = sizeof(int),
6127 .mode = 0644,
6128 .proc_handler = proc_dointvec,
6129 },
6130 {
6131 .procname = "temp_prefered_lft",
6132 .data = &ipv6_devconf.temp_prefered_lft,
6133 .maxlen = sizeof(int),
6134 .mode = 0644,
6135 .proc_handler = proc_dointvec,
6136 },
6137 {
6138 .procname = "regen_max_retry",
6139 .data = &ipv6_devconf.regen_max_retry,
6140 .maxlen = sizeof(int),
6141 .mode = 0644,
6142 .proc_handler = proc_dointvec,
6143 },
6144 {
6145 .procname = "max_desync_factor",
6146 .data = &ipv6_devconf.max_desync_factor,
6147 .maxlen = sizeof(int),
6148 .mode = 0644,
6149 .proc_handler = proc_dointvec,
6150 },
6151 {
6152 .procname = "max_addresses",
6153 .data = &ipv6_devconf.max_addresses,
6154 .maxlen = sizeof(int),
6155 .mode = 0644,
6156 .proc_handler = proc_dointvec,
6157 },
6158 {
6159 .procname = "accept_ra_defrtr",
6160 .data = &ipv6_devconf.accept_ra_defrtr,
6161 .maxlen = sizeof(int),
6162 .mode = 0644,
6163 .proc_handler = proc_dointvec,
6164 },
6165 {
6166 .procname = "accept_ra_min_hop_limit",
6167 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6168 .maxlen = sizeof(int),
6169 .mode = 0644,
6170 .proc_handler = proc_dointvec,
6171 },
6172 {
6173 .procname = "accept_ra_pinfo",
6174 .data = &ipv6_devconf.accept_ra_pinfo,
6175 .maxlen = sizeof(int),
6176 .mode = 0644,
6177 .proc_handler = proc_dointvec,
6178 },
930d6ff2 6179#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 6180 {
6181 .procname = "accept_ra_rtr_pref",
6182 .data = &ipv6_devconf.accept_ra_rtr_pref,
6183 .maxlen = sizeof(int),
6184 .mode = 0644,
6185 .proc_handler = proc_dointvec,
6186 },
6187 {
6188 .procname = "router_probe_interval",
6189 .data = &ipv6_devconf.rtr_probe_interval,
6190 .maxlen = sizeof(int),
6191 .mode = 0644,
6192 .proc_handler = proc_dointvec_jiffies,
6193 },
fa03ef38 6194#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b
JS		 6195 {
6196 .procname = "accept_ra_rt_info_min_plen",
6197 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6198 .maxlen = sizeof(int),
6199 .mode = 0644,
6200 .proc_handler = proc_dointvec,
6201 },
5df1f77f
KK		 6202 {
6203 .procname = "accept_ra_rt_info_max_plen",
6204 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6205 .maxlen = sizeof(int),
6206 .mode = 0644,
6207 .proc_handler = proc_dointvec,
6208 },
09c884d4 6209#endif
930d6ff2 6210#endif
5df1f77f
KK		 6211 {
6212 .procname = "proxy_ndp",
6213 .data = &ipv6_devconf.proxy_ndp,
6214 .maxlen = sizeof(int),
6215 .mode = 0644,
6216 .proc_handler = addrconf_sysctl_proxy_ndp,
6217 },
6218 {
6219 .procname = "accept_source_route",
6220 .data = &ipv6_devconf.accept_source_route,
6221 .maxlen = sizeof(int),
6222 .mode = 0644,
6223 .proc_handler = proc_dointvec,
6224 },
95c385b4 6225#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 6226 {
6227 .procname = "optimistic_dad",
6228 .data = &ipv6_devconf.optimistic_dad,
6229 .maxlen = sizeof(int),
6230 .mode = 0644,
6231 .proc_handler = proc_dointvec,
6232 },
6233 {
6234 .procname = "use_optimistic",
6235 .data = &ipv6_devconf.use_optimistic,
6236 .maxlen = sizeof(int),
6237 .mode = 0644,
6238 .proc_handler = proc_dointvec,
6239 },
7bc570c8
YH		 6240#endif
6241#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 6242 {
6243 .procname = "mc_forwarding",
6244 .data = &ipv6_devconf.mc_forwarding,
6245 .maxlen = sizeof(int),
6246 .mode = 0444,
6247 .proc_handler = proc_dointvec,
6248 },
95c385b4 6249#endif
5df1f77f
KK		 6250 {
6251 .procname = "disable_ipv6",
6252 .data = &ipv6_devconf.disable_ipv6,
6253 .maxlen = sizeof(int),
6254 .mode = 0644,
6255 .proc_handler = addrconf_sysctl_disable,
6256 },
6257 {
6258 .procname = "accept_dad",
6259 .data = &ipv6_devconf.accept_dad,
6260 .maxlen = sizeof(int),
6261 .mode = 0644,
6262 .proc_handler = proc_dointvec,
6263 },
6264 {
6265 .procname = "force_tllao",
6266 .data = &ipv6_devconf.force_tllao,
6267 .maxlen = sizeof(int),
6268 .mode = 0644,
6269 .proc_handler = proc_dointvec
6270 },
6271 {
6272 .procname = "ndisc_notify",
6273 .data = &ipv6_devconf.ndisc_notify,
6274 .maxlen = sizeof(int),
6275 .mode = 0644,
6276 .proc_handler = proc_dointvec
6277 },
6278 {
6279 .procname = "suppress_frag_ndisc",
6280 .data = &ipv6_devconf.suppress_frag_ndisc,
6281 .maxlen = sizeof(int),
6282 .mode = 0644,
6283 .proc_handler = proc_dointvec
6284 },
6285 {
6286 .procname = "accept_ra_from_local",
6287 .data = &ipv6_devconf.accept_ra_from_local,
6288 .maxlen = sizeof(int),
6289 .mode = 0644,
6290 .proc_handler = proc_dointvec,
6291 },
6292 {
6293 .procname = "accept_ra_mtu",
6294 .data = &ipv6_devconf.accept_ra_mtu,
6295 .maxlen = sizeof(int),
6296 .mode = 0644,
6297 .proc_handler = proc_dointvec,
6298 },
6299 {
6300 .procname = "stable_secret",
6301 .data = &ipv6_devconf.stable_secret,
6302 .maxlen = IPV6_MAX_STRLEN,
6303 .mode = 0600,
6304 .proc_handler = addrconf_sysctl_stable_secret,
6305 },
6306 {
6307 .procname = "use_oif_addrs_only",
6308 .data = &ipv6_devconf.use_oif_addrs_only,
6309 .maxlen = sizeof(int),
6310 .mode = 0644,
6311 .proc_handler = proc_dointvec,
6312 },
6313 {
6314 .procname = "ignore_routes_with_linkdown",
6315 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6316 .maxlen = sizeof(int),
6317 .mode = 0644,
6318 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6319 },
6320 {
6321 .procname = "drop_unicast_in_l2_multicast",
6322 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6323 .maxlen = sizeof(int),
6324 .mode = 0644,
6325 .proc_handler = proc_dointvec,
6326 },
6327 {
6328 .procname = "drop_unsolicited_na",
6329 .data = &ipv6_devconf.drop_unsolicited_na,
6330 .maxlen = sizeof(int),
6331 .mode = 0644,
6332 .proc_handler = proc_dointvec,
6333 },
6334 {
6335 .procname = "keep_addr_on_down",
6336 .data = &ipv6_devconf.keep_addr_on_down,
6337 .maxlen = sizeof(int),
6338 .mode = 0644,
6339 .proc_handler = proc_dointvec,
6340
6341 },
1ababeba
DL		 6342 {
6343 .procname = "seg6_enabled",
6344 .data = &ipv6_devconf.seg6_enabled,
6345 .maxlen = sizeof(int),
6346 .mode = 0644,
6347 .proc_handler = proc_dointvec,
6348 },
bf355b8d
DL		 6349#ifdef CONFIG_IPV6_SEG6_HMAC
6350 {
6351 .procname = "seg6_require_hmac",
6352 .data = &ipv6_devconf.seg6_require_hmac,
6353 .maxlen = sizeof(int),
6354 .mode = 0644,
6355 .proc_handler = proc_dointvec,
6356 },
6357#endif
adc176c5
EN		 6358 {
6359 .procname = "enhanced_dad",
6360 .data = &ipv6_devconf.enhanced_dad,
6361 .maxlen = sizeof(int),
6362 .mode = 0644,
6363 .proc_handler = proc_dointvec,
6364 },
d35a00b8
FJ		 6365 {
6366 .procname = "addr_gen_mode",
6367 .data = &ipv6_devconf.addr_gen_mode,
6368 .maxlen = sizeof(int),
6369 .mode = 0644,
6370 .proc_handler = addrconf_sysctl_addr_gen_mode,
6371 },
df789fe7
DF		 6372 {
6373 .procname = "disable_policy",
6374 .data = &ipv6_devconf.disable_policy,
6375 .maxlen = sizeof(int),
6376 .mode = 0644,
6377 .proc_handler = addrconf_sysctl_disable_policy,
6378 },
5df1f77f
KK		 6379 {
6380 /* sentinel */
6381 }
1da177e4
LT		 6382};
6383
bff16c2f 6384static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 6385 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4 6386{
29c994e3 6387 int i, ifindex;
607ea7cd 6388 struct ctl_table *table;
6105e293 6389 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 6390
607ea7cd
KK		 6391 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6392 if (!table)
f68635e6
PE		 6393 goto out;
6394
607ea7cd
KK		 6395 for (i = 0; table[i].data; i++) {
6396 table[i].data += (char *)p - (char *)&ipv6_devconf;
cb9e684e
MŻ		 6397 /* If one of these is already set, then it is not safe to
6398 * overwrite either of them: this makes proc_dointvec_minmax
6399 * usable.
6400 */
6401 if (!table[i].extra1 && !table[i].extra2) {
6402 table[i].extra1 = idev; /* embedded; no ref */
6403 table[i].extra2 = net;
6404 }
1da177e4 6405 }
1da177e4 6406
6105e293 6407 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 6408
607ea7cd
KK		 6409 p->sysctl_header = register_net_sysctl(net, path, table);
6410 if (!p->sysctl_header)
6105e293 6411 goto free;
f68635e6 6412
29c994e3
ND		 6413 if (!strcmp(dev_name, "all"))
6414 ifindex = NETCONFA_IFINDEX_ALL;
6415 else if (!strcmp(dev_name, "default"))
6416 ifindex = NETCONFA_IFINDEX_DEFAULT;
6417 else
6418 ifindex = idev->dev->ifindex;
85b3daad
DA		 6419 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6420 ifindex, p);
95897312 6421 return 0;
1da177e4 6422
f68635e6 6423free:
607ea7cd 6424 kfree(table);
f68635e6 6425out:
95897312 6426 return -ENOBUFS;
1da177e4
LT		 6427}
6428
23452170
DA		 6429static void __addrconf_sysctl_unregister(struct net *net,
6430 struct ipv6_devconf *p, int ifindex)
408c4768 6431{
607ea7cd 6432 struct ctl_table *table;
408c4768 6433
607ea7cd 6434 if (!p->sysctl_header)
408c4768
PE		 6435 return;
6436
607ea7cd
KK		 6437 table = p->sysctl_header->ctl_table_arg;
6438 unregister_net_sysctl_table(p->sysctl_header);
6439 p->sysctl_header = NULL;
6440 kfree(table);
23452170
DA		 6441
6442 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
408c4768
PE		 6443}
6444
a317a2f1 6445static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 6446{
a317a2f1
WC		 6447 int err;
6448
6449 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6450 return -EINVAL;
6451
6452 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6453 &ndisc_ifinfo_sysctl_change);
6454 if (err)
6455 return err;
6456 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6457 idev, &idev->cnf);
6458 if (err)
6459 neigh_sysctl_unregister(idev->nd_parms);
6460
6461 return err;
f52295a9
PE		 6462}
6463
408c4768 6464static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 6465{
23452170
DA		 6466 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6467 idev->dev->ifindex);
408c4768 6468 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 6469}
6470
6471
6472#endif
6473
2c8c1e72 6474static int __net_init addrconf_init_net(struct net *net)
e0da5a48 6475{
a79ca223 6476 int err = -ENOMEM;
e0da5a48
PE		 6477 struct ipv6_devconf *all, *dflt;
6478
a79ca223 6479 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 6480 if (!all)
a79ca223 6481 goto err_alloc_all;
e0da5a48 6482
a79ca223 6483 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 6484 if (!dflt)
a79ca223 6485 goto err_alloc_dflt;
e0da5a48 6486
a79ca223
HZ		 6487 /* these will be inherited by all namespaces */
6488 dflt->autoconf = ipv6_defaults.autoconf;
6489 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 6490
3d1bec99
HFS		 6491 dflt->stable_secret.initialized = false;
6492 all->stable_secret.initialized = false;
6493
e0da5a48
PE		 6494 net->ipv6.devconf_all = all;
6495 net->ipv6.devconf_dflt = dflt;
6496
6497#ifdef CONFIG_SYSCTL
f8572d8f 6498 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 6499 if (err < 0)
6500 goto err_reg_all;
6501
f8572d8f 6502 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 6503 if (err < 0)
6504 goto err_reg_dflt;
6505#endif
6506 return 0;
6507
6508#ifdef CONFIG_SYSCTL
6509err_reg_dflt:
23452170 6510 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
e0da5a48
PE		 6511err_reg_all:
6512 kfree(dflt);
6513#endif
6514err_alloc_dflt:
6515 kfree(all);
6516err_alloc_all:
6517 return err;
6518}
6519
2c8c1e72 6520static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 6521{
6522#ifdef CONFIG_SYSCTL
23452170
DA		 6523 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6524 NETCONFA_IFINDEX_DEFAULT);
6525 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6526 NETCONFA_IFINDEX_ALL);
e0da5a48 6527#endif
73cf0e92 6528 kfree(net->ipv6.devconf_dflt);
6529 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 6530}
6531
6532static struct pernet_operations addrconf_ops = {
6533 .init = addrconf_init_net,
6534 .exit = addrconf_exit_net,
6535};
6536
207895fd 6537static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 6538 .family = AF_INET6,
6539 .fill_link_af = inet6_fill_link_af,
6540 .get_link_af_size = inet6_get_link_af_size,
11b1f828 6541 .validate_link_af = inet6_validate_link_af,
f53adae4 6542 .set_link_af = inet6_set_link_af,
b382b191
TG		 6543};
6544
1da177e4
LT		 6545/*
6546 * Init / cleanup code
6547 */
6548
6549int __init addrconf_init(void)
6550{
a317a2f1 6551 struct inet6_dev *idev;
c2e21293 6552 int i, err;
2a8cc6c8 6553
e21e8467
SH		 6554 err = ipv6_addr_label_init();
6555 if (err < 0) {
f3213831
JP		 6556 pr_crit("%s: cannot initialize default policy table: %d\n",
6557 __func__, err);
2cc6d2bf 6558 goto out;
2a8cc6c8 6559 }
1da177e4 6560
2cc6d2bf
NH		 6561 err = register_pernet_subsys(&addrconf_ops);
6562 if (err < 0)
6563 goto out_addrlabel;
e0da5a48 6564
c15b1cca
HFS		 6565 addrconf_wq = create_workqueue("ipv6_addrconf");
6566 if (!addrconf_wq) {
6567 err = -ENOMEM;
6568 goto out_nowq;
6569 }
6570
1da177e4
LT		 6571 /* The addrconf netdev notifier requires that loopback_dev
6572 * has it's ipv6 private information allocated and setup
6573 * before it can bring up and give link-local addresses
6574 * to other devices which are up.
6575 *
6576 * Unfortunately, loopback_dev is not necessarily the first
6577 * entry in the global dev_base list of net devices. In fact,
6578 * it is likely to be the very last entry on that list.
6579 * So this causes the notifier registry below to try and
6580 * give link-local addresses to all devices besides loopback_dev
6581 * first, then loopback_dev, which cases all the non-loopback_dev
6582 * devices to fail to get a link-local address.
6583 *
6584 * So, as a temporary fix, allocate the ipv6 structure for
6585 * loopback_dev first by hand.
6586 * Longer term, all of the dependencies ipv6 has upon the loopback
6587 * device and it being up should be removed.
6588 */
6589 rtnl_lock();
a317a2f1 6590 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 6591 rtnl_unlock();
a317a2f1
WC		 6592 if (IS_ERR(idev)) {
6593 err = PTR_ERR(idev);
e0da5a48 6594 goto errlo;
a317a2f1 6595 }
1da177e4 6596
2f460933
WC		 6597 ip6_route_init_special_entries();
6598
c2e21293 6599 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6600 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6601
1da177e4
LT		 6602 register_netdevice_notifier(&ipv6_dev_notf);
6603
c15b1cca 6604 addrconf_verify();
c127ea2c 6605
3678a9d8 6606 rtnl_af_register(&inet6_ops);
b382b191 6607
c7ac8679
GR		 6608 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6609 NULL);
c127ea2c
TG		 6610 if (err < 0)
6611 goto errout;
6612
6613 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 6614 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6615 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6616 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6617 inet6_dump_ifaddr, NULL);
6618 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6619 inet6_dump_ifmcaddr, NULL);
6620 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6621 inet6_dump_ifacaddr, NULL);
76f8f6cb 6622 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 6623 inet6_netconf_dump_devconf, NULL);
c127ea2c 6624
2a8cc6c8
YH		 6625 ipv6_addr_label_rtnl_register();
6626
1da177e4 6627 return 0;
c127ea2c 6628errout:
b382b191 6629 rtnl_af_unregister(&inet6_ops);
c127ea2c 6630 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6631errlo:
c15b1cca
HFS		 6632 destroy_workqueue(addrconf_wq);
6633out_nowq:
e0da5a48 6634 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 6635out_addrlabel:
6636 ipv6_addr_label_cleanup();
6637out:
c127ea2c 6638 return err;
1da177e4
LT		 6639}
6640
09f7709f 6641void addrconf_cleanup(void)
1da177e4 6642{
176c39af 6643 struct net_device *dev;
1da177e4
LT		 6644 int i;
6645
6646 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6647 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 6648 ipv6_addr_label_cleanup();
1da177e4
LT		 6649
6650 rtnl_lock();
6651
b382b191
TG		 6652 __rtnl_af_unregister(&inet6_ops);
6653
176c39af
DL		 6654 /* clean dev list */
6655 for_each_netdev(&init_net, dev) {
6656 if (__in6_dev_get(dev) == NULL)
6657 continue;
6658 addrconf_ifdown(dev, 1);
6659 }
6660 addrconf_ifdown(init_net.loopback_dev, 2);
6661
1da177e4
LT		 6662 /*
6663 * Check hash table.
6664 */
5c578aed 6665 spin_lock_bh(&addrconf_hash_lock);
c2e21293 6666 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6667 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 6668 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 6669 cancel_delayed_work(&addr_chk_work);
1da177e4 6670 rtnl_unlock();
c15b1cca
HFS		 6671
6672 destroy_workqueue(addrconf_wq);
1da177e4 6673}
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