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Merge remote-tracking branch 'regulator/fix/max77802' into regulator-linus
[mirror_ubuntu-artful-kernel.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
174cd4b1 46#include <linux/sched/signal.h>
1da177e4
LT		 47#include <linux/socket.h>
48#include <linux/sockios.h>
1da177e4 49#include <linux/net.h>
3d1bec99 50#include <linux/inet.h>
1da177e4
LT		 51#include <linux/in6.h>
52#include <linux/netdevice.h>
1823730f 53#include <linux/if_addr.h>
1da177e4
LT		 54#include <linux/if_arp.h>
55#include <linux/if_arcnet.h>
56#include <linux/if_infiniband.h>
57#include <linux/route.h>
58#include <linux/inetdevice.h>
59#include <linux/init.h>
5a0e3ad6 60#include <linux/slab.h>
1da177e4
LT		 61#ifdef CONFIG_SYSCTL
62#include <linux/sysctl.h>
63#endif
4fc268d2 64#include <linux/capability.h>
1da177e4
LT		 65#include <linux/delay.h>
66#include <linux/notifier.h>
543537bd 67#include <linux/string.h>
ddbe5032 68#include <linux/hash.h>
1da177e4 69
457c4cbc 70#include <net/net_namespace.h>
1da177e4
LT		 71#include <net/sock.h>
72#include <net/snmp.h>
73
5241c2d7 74#include <net/6lowpan.h>
cb6bf355 75#include <net/firewire.h>
1da177e4
LT		 76#include <net/ipv6.h>
77#include <net/protocol.h>
78#include <net/ndisc.h>
79#include <net/ip6_route.h>
80#include <net/addrconf.h>
81#include <net/tcp.h>
82#include <net/ip.h>
5d620266 83#include <net/netlink.h>
f24e3d65 84#include <net/pkt_sched.h>
ca254490 85#include <net/l3mdev.h>
1da177e4
LT		 86#include <linux/if_tunnel.h>
87#include <linux/rtnetlink.h>
f3a1bfb1 88#include <linux/netconf.h>
1da177e4 89#include <linux/random.h>
e21e8467 90#include <linux/uaccess.h>
7f7d9a6b 91#include <asm/unaligned.h>
1da177e4
LT		 92
93#include <linux/proc_fs.h>
94#include <linux/seq_file.h>
bc3b2d7f 95#include <linux/export.h>
1da177e4
LT		 96
97/* Set to 3 to get tracing... */
98#define ACONF_DEBUG 2
99
100#if ACONF_DEBUG >= 3
ba3542e1 101#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
1da177e4 102#else
ba3542e1 103#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
1da177e4
LT		 104#endif
105
106#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e 107
3d1bec99
HFS		 108#define IPV6_MAX_STRLEN \
109 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
110
18a31e1e
TG		 111static inline u32 cstamp_delta(unsigned long cstamp)
112{
113 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
114}
1da177e4 115
bd11f074
MŻ		 116static inline s32 rfc3315_s14_backoff_init(s32 irt)
117{
118 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
119 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
120 do_div(tmp, 1000000);
121 return (s32)tmp;
122}
123
124static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
125{
126 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
127 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
128 do_div(tmp, 1000000);
129 if ((s32)tmp > mrt) {
130 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
131 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
132 do_div(tmp, 1000000);
133 }
134 return (s32)tmp;
135}
136
1da177e4 137#ifdef CONFIG_SYSCTL
a317a2f1 138static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 139static void addrconf_sysctl_unregister(struct inet6_dev *idev);
140#else
a317a2f1 141static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 142{
a317a2f1 143 return 0;
408c4768
PE		 144}
145
146static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
147{
148}
1da177e4
LT		 149#endif
150
9d6280da
JB		 151static void ipv6_regen_rndid(struct inet6_dev *idev);
152static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 153
1b34be74 154static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4 155static int ipv6_count_addresses(struct inet6_dev *idev);
622c81d5
HFS		 156static int ipv6_generate_stable_address(struct in6_addr *addr,
157 u8 dad_count,
158 const struct inet6_dev *idev);
1da177e4
LT		 159
160/*
161 * Configured unicast address hash table
162 */
c2e21293 163static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 164static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 165
c15b1cca
HFS		 166static void addrconf_verify(void);
167static void addrconf_verify_rtnl(void);
168static void addrconf_verify_work(struct work_struct *);
1da177e4 169
c15b1cca
HFS		 170static struct workqueue_struct *addrconf_wq;
171static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 172
173static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
174static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
175
93d9b7d7
JP		 176static void addrconf_type_change(struct net_device *dev,
177 unsigned long event);
1da177e4
LT		 178static int addrconf_ifdown(struct net_device *dev, int how);
179
21caa662
RK		 180static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
181 int plen,
182 const struct net_device *dev,
183 u32 flags, u32 noflags);
184
cf22f9a2 185static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 186static void addrconf_dad_work(struct work_struct *w);
764d3be6 187static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id);
c5e33bdd 188static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 189static void addrconf_rs_timer(unsigned long data);
190static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
191static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
192
1ab1457c 193static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 194 struct prefix_info *pinfo);
3e81c6da
DM		 195static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
196 struct net_device *dev);
1da177e4 197
888c848e 198static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 199 .forwarding = 0,
200 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
201 .mtu6 = IPV6_MIN_MTU,
202 .accept_ra = 1,
203 .accept_redirects = 1,
204 .autoconf = 1,
205 .force_mld_version = 0,
fc4eba58
HFS		 206 .mldv1_unsolicited_report_interval = 10 * HZ,
207 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 208 .dad_transmits = 1,
209 .rtr_solicits = MAX_RTR_SOLICITATIONS,
210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 211 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 212 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 213 .use_tempaddr = 0,
1da177e4
LT		 214 .temp_valid_lft = TEMP_VALID_LIFETIME,
215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
216 .regen_max_retry = REGEN_MAX_RETRY,
217 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 218 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 219 .accept_ra_defrtr = 1,
d9333196 220 .accept_ra_from_local = 0,
8013d1d7 221 .accept_ra_min_hop_limit= 1,
c4fd30eb 222 .accept_ra_pinfo = 1,
930d6ff2
YH		 223#ifdef CONFIG_IPV6_ROUTER_PREF
224 .accept_ra_rtr_pref = 1,
52e16356 225 .rtr_probe_interval = 60 * HZ,
09c884d4 226#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 227 .accept_ra_rt_info_min_plen = 0,
09c884d4
YH		 228 .accept_ra_rt_info_max_plen = 0,
229#endif
930d6ff2 230#endif
fbea49e1 231 .proxy_ndp = 0,
0bcbc926 232 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 233 .disable_ipv6 = 0,
1b34be74 234 .accept_dad = 1,
b800c3b9 235 .suppress_frag_ndisc = 1,
c2943f14 236 .accept_ra_mtu = 1,
3d1bec99
HFS		 237 .stable_secret = {
238 .initialized = false,
3985e8a3
EK		 239 },
240 .use_oif_addrs_only = 0,
35103d11 241 .ignore_routes_with_linkdown = 0,
f1705ec1 242 .keep_addr_on_down = 0,
1ababeba 243 .seg6_enabled = 0,
bf355b8d
DL		 244#ifdef CONFIG_IPV6_SEG6_HMAC
245 .seg6_require_hmac = 0,
246#endif
adc176c5 247 .enhanced_dad = 1,
d35a00b8 248 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
df789fe7 249 .disable_policy = 0,
1da177e4
LT		 250};
251
ab32ea5d 252static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 253 .forwarding = 0,
254 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
255 .mtu6 = IPV6_MIN_MTU,
256 .accept_ra = 1,
257 .accept_redirects = 1,
258 .autoconf = 1,
fc4eba58
HFS		 259 .force_mld_version = 0,
260 .mldv1_unsolicited_report_interval = 10 * HZ,
261 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 262 .dad_transmits = 1,
263 .rtr_solicits = MAX_RTR_SOLICITATIONS,
264 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 265 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 266 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 267 .use_tempaddr = 0,
268 .temp_valid_lft = TEMP_VALID_LIFETIME,
269 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
270 .regen_max_retry = REGEN_MAX_RETRY,
271 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 272 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 273 .accept_ra_defrtr = 1,
d9333196 274 .accept_ra_from_local = 0,
8013d1d7 275 .accept_ra_min_hop_limit= 1,
c4fd30eb 276 .accept_ra_pinfo = 1,
930d6ff2
YH		 277#ifdef CONFIG_IPV6_ROUTER_PREF
278 .accept_ra_rtr_pref = 1,
52e16356 279 .rtr_probe_interval = 60 * HZ,
09c884d4 280#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 281 .accept_ra_rt_info_min_plen = 0,
09c884d4
YH		 282 .accept_ra_rt_info_max_plen = 0,
283#endif
930d6ff2 284#endif
fbea49e1 285 .proxy_ndp = 0,
0bcbc926 286 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 287 .disable_ipv6 = 0,
1b34be74 288 .accept_dad = 1,
b800c3b9 289 .suppress_frag_ndisc = 1,
c2943f14 290 .accept_ra_mtu = 1,
3d1bec99
HFS		 291 .stable_secret = {
292 .initialized = false,
293 },
3985e8a3 294 .use_oif_addrs_only = 0,
35103d11 295 .ignore_routes_with_linkdown = 0,
f1705ec1 296 .keep_addr_on_down = 0,
1ababeba 297 .seg6_enabled = 0,
bf355b8d
DL		 298#ifdef CONFIG_IPV6_SEG6_HMAC
299 .seg6_require_hmac = 0,
300#endif
adc176c5 301 .enhanced_dad = 1,
d35a00b8 302 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
df789fe7 303 .disable_policy = 0,
1da177e4
LT		 304};
305
f24e3d65 306/* Check if a valid qdisc is available */
05297949 307static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 308{
05297949 309 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 310}
311
b7b1bfce 312static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 313{
b7b1bfce
HFS		 314 if (del_timer(&idev->rs_timer))
315 __in6_dev_put(idev);
316}
317
c15b1cca 318static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 319{
c15b1cca 320 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 321 __in6_ifa_put(ifp);
322}
323
b7b1bfce
HFS		 324static void addrconf_mod_rs_timer(struct inet6_dev *idev,
325 unsigned long when)
326{
327 if (!timer_pending(&idev->rs_timer))
328 in6_dev_hold(idev);
329 mod_timer(&idev->rs_timer, jiffies + when);
330}
1da177e4 331
c15b1cca
HFS		 332static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
333 unsigned long delay)
1da177e4 334{
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. */
322f74a4 429 in6_dev_hold(ndev);
1da177e4 430
1b34be74
YH		 431 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
432 ndev->cnf.accept_dad = -1;
433
07a93626 434#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 435 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 436 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 437 ndev->cnf.rtr_solicits = 0;
438 }
439#endif
440
372e6c8f 441 INIT_LIST_HEAD(&ndev->tempaddr_list);
76506a98 442 ndev->desync_factor = U32_MAX;
322f74a4
IO		 443 if ((dev->flags&IFF_LOOPBACK) ||
444 dev->type == ARPHRD_TUNNEL ||
9625ed72 445 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 446 dev->type == ARPHRD_SIT ||
0be669bb 447 dev->type == ARPHRD_NONE) {
322f74a4 448 ndev->cnf.use_tempaddr = -1;
9d6280da
JB		 449 } else
450 ipv6_regen_rndid(ndev);
5d9efa7e 451
914faa14 452 ndev->token = in6addr_any;
1da177e4 453
f24e3d65 454 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 455 ndev->if_flags |= IF_READY;
456
322f74a4
IO		 457 ipv6_mc_init_dev(ndev);
458 ndev->tstamp = jiffies;
a317a2f1
WC		 459 err = addrconf_sysctl_register(ndev);
460 if (err) {
461 ipv6_mc_destroy_dev(ndev);
2a189f9e 462 snmp6_unregister_dev(ndev);
a317a2f1
WC		 463 goto err_release;
464 }
30c4cf57 465 /* protected by rtnl_lock */
cf778b00 466 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 467
2c5e8933
HFS		 468 /* Join interface-local all-node multicast group */
469 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
470
d88ae4cc 471 /* Join all-node multicast group */
f3ee4010 472 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 473
d6ddef9e 474 /* Join all-router multicast group if forwarding is set */
8b2aaede 475 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 476 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
477
1da177e4 478 return ndev;
a317a2f1
WC		 479
480err_release:
481 neigh_parms_release(&nd_tbl, ndev->nd_parms);
482 ndev->dead = 1;
483 in6_dev_finish_destroy(ndev);
484 return ERR_PTR(err);
1da177e4
LT		 485}
486
8e5e8f30 487static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 488{
489 struct inet6_dev *idev;
490
491 ASSERT_RTNL();
492
e21e8467
SH		 493 idev = __in6_dev_get(dev);
494 if (!idev) {
495 idev = ipv6_add_dev(dev);
a317a2f1 496 if (IS_ERR(idev))
1da177e4
LT		 497 return NULL;
498 }
c5e33bdd 499
1da177e4
LT		 500 if (dev->flags&IFF_UP)
501 ipv6_mc_up(idev);
502 return idev;
503}
504
f3a1bfb1
ND		 505static int inet6_netconf_msgsize_devconf(int type)
506{
507 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
508 + nla_total_size(4); /* NETCONFA_IFINDEX */
136ba622 509 bool all = false;
f3a1bfb1 510
136ba622
ZS		 511 if (type == NETCONFA_ALL)
512 all = true;
513
514 if (all || type == NETCONFA_FORWARDING)
f3a1bfb1 515 size += nla_total_size(4);
b1afce95 516#ifdef CONFIG_IPV6_MROUTE
136ba622 517 if (all || type == NETCONFA_MC_FORWARDING)
d67b8c61 518 size += nla_total_size(4);
b1afce95 519#endif
136ba622 520 if (all || type == NETCONFA_PROXY_NEIGH)
c92d5491 521 size += nla_total_size(4);
f3a1bfb1 522
136ba622 523 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
35103d11
AG		 524 size += nla_total_size(4);
525
f3a1bfb1
ND		 526 return size;
527}
528
529static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
530 struct ipv6_devconf *devconf, u32 portid,
531 u32 seq, int event, unsigned int flags,
532 int type)
533{
534 struct nlmsghdr *nlh;
535 struct netconfmsg *ncm;
136ba622 536 bool all = false;
f3a1bfb1
ND		 537
538 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
539 flags);
63159f29 540 if (!nlh)
f3a1bfb1
ND		 541 return -EMSGSIZE;
542
136ba622
ZS		 543 if (type == NETCONFA_ALL)
544 all = true;
545
f3a1bfb1
ND		 546 ncm = nlmsg_data(nlh);
547 ncm->ncm_family = AF_INET6;
548
549 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
550 goto nla_put_failure;
551
23452170
DA		 552 if (!devconf)
553 goto out;
554
136ba622 555 if ((all || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 556 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
557 goto nla_put_failure;
b1afce95 558#ifdef CONFIG_IPV6_MROUTE
136ba622 559 if ((all || type == NETCONFA_MC_FORWARDING) &&
d67b8c61
ND		 560 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
561 devconf->mc_forwarding) < 0)
562 goto nla_put_failure;
b1afce95 563#endif
136ba622 564 if ((all || type == NETCONFA_PROXY_NEIGH) &&
c92d5491 565 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
566 goto nla_put_failure;
567
136ba622 568 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
35103d11
AG		 569 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
570 devconf->ignore_routes_with_linkdown) < 0)
571 goto nla_put_failure;
572
23452170 573out:
053c095a
JB		 574 nlmsg_end(skb, nlh);
575 return 0;
f3a1bfb1
ND		 576
577nla_put_failure:
578 nlmsg_cancel(skb, nlh);
579 return -EMSGSIZE;
580}
581
85b3daad
DA		 582void inet6_netconf_notify_devconf(struct net *net, int event, int type,
583 int ifindex, struct ipv6_devconf *devconf)
f3a1bfb1
ND		 584{
585 struct sk_buff *skb;
586 int err = -ENOBUFS;
587
927265bc 588 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
63159f29 589 if (!skb)
f3a1bfb1
ND		 590 goto errout;
591
592 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
85b3daad 593 event, 0, type);
f3a1bfb1
ND		 594 if (err < 0) {
595 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
596 WARN_ON(err == -EMSGSIZE);
597 kfree_skb(skb);
598 goto errout;
599 }
927265bc 600 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
f3a1bfb1
ND		 601 return;
602errout:
bd779028 603 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 604}
605
76f8f6cb
ND		 606static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
607 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
608 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 609 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
35103d11 610 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
76f8f6cb
ND		 611};
612
613static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
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;
3a88a81d 966 unsigned int hash;
1da177e4 967 int err = 0;
d68b8270
YH		 968 int addr_type = ipv6_addr_type(addr);
969
970 if (addr_type == IPV6_ADDR_ANY ||
971 addr_type & IPV6_ADDR_MULTICAST ||
972 (!(idev->dev->flags & IFF_LOOPBACK) &&
973 addr_type & IPV6_ADDR_LOOPBACK))
974 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 975
8814c4b5 976 rcu_read_lock_bh();
1da177e4
LT		 977 if (idev->dead) {
978 err = -ENODEV; /*XXX*/
979 goto out2;
980 }
981
56d417b1 982 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 983 err = -EACCES;
984 goto out2;
985 }
986
5c578aed 987 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 988
989 /* Ignore adding duplicate addresses on an interface */
c346dca1 990 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ba3542e1 991 ADBG("ipv6_add_addr: already assigned\n");
1da177e4
LT		 992 err = -EEXIST;
993 goto out;
994 }
995
322f74a4 996 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4 997
63159f29 998 if (!ifa) {
ba3542e1 999 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 1000 err = -ENOBUFS;
1001 goto out;
1002 }
1003
8f031519 1004 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 1005 if (IS_ERR(rt)) {
1006 err = PTR_ERR(rt);
1007 goto out;
1008 }
1009
df789fe7
DF		 1010 if (net->ipv6.devconf_all->disable_policy ||
1011 idev->cnf.disable_policy)
1012 rt->dst.flags |= DST_NOPOLICY;
1013
bba24896
JP		 1014 neigh_parms_data_state_setall(idev->nd_parms);
1015
4e3fd7a0 1016 ifa->addr = *addr;
3f8f5298
JP		 1017 if (peer_addr)
1018 ifa->peer_addr = *peer_addr;
1da177e4
LT		 1019
1020 spin_lock_init(&ifa->lock);
c15b1cca 1021 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 1022 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 1023 ifa->scope = scope;
1024 ifa->prefix_len = pfxlen;
66eb9f86
MB		 1025 ifa->flags = flags;
1026 /* No need to add the TENTATIVE flag for addresses with NODAD */
1027 if (!(flags & IFA_F_NODAD))
1028 ifa->flags |= IFA_F_TENTATIVE;
8a226b2c
JB		 1029 ifa->valid_lft = valid_lft;
1030 ifa->prefered_lft = prefered_lft;
1da177e4 1031 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 1032 ifa->tokenized = false;
1da177e4 1033
57f5f544
KF		 1034 ifa->rt = rt;
1035
1da177e4
LT		 1036 ifa->idev = idev;
1037 in6_dev_hold(idev);
1038 /* For caller */
1039 in6_ifa_hold(ifa);
1040
1041 /* Add to big hash table */
ddbe5032 1042 hash = inet6_addr_hash(addr);
1da177e4 1043
5c578aed 1044 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 1045 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 1046
1047 write_lock(&idev->lock);
1048 /* Add to inet6_dev unicast addr list. */
e55ffac6 1049 ipv6_link_dev_addr(idev, ifa);
1da177e4 1050
1da177e4 1051 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 1052 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 1053 in6_ifa_hold(ifa);
1054 }
1da177e4 1055
1da177e4
LT		 1056 in6_ifa_hold(ifa);
1057 write_unlock(&idev->lock);
1058out2:
8814c4b5 1059 rcu_read_unlock_bh();
1da177e4 1060
fd92833a 1061 if (likely(err == 0))
f88c91dd 1062 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 1063 else {
1064 kfree(ifa);
1065 ifa = ERR_PTR(err);
1066 }
1067
1068 return ifa;
1069out:
5c578aed 1070 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 1071 goto out2;
1072}
1073
5b84efec
TH		 1074enum cleanup_prefix_rt_t {
1075 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1076 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1077 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1078};
1079
1080/*
1081 * Check, whether the prefix for ifp would still need a prefix route
1082 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1083 * constants.
1084 *
1085 * 1) we don't purge prefix if address was not permanent.
1086 * prefix is managed by its own lifetime.
1087 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1088 * 3) if there are no addresses, delete prefix.
1089 * 4) if there are still other permanent address(es),
1090 * corresponding prefix is still permanent.
1091 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1092 * don't purge the prefix, assume user space is managing it.
1093 * 6) otherwise, update prefix lifetime to the
1094 * longest valid lifetime among the corresponding
1095 * addresses on the device.
1096 * Note: subsequent RA will update lifetime.
1097 **/
1098static enum cleanup_prefix_rt_t
1099check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1100{
1101 struct inet6_ifaddr *ifa;
1102 struct inet6_dev *idev = ifp->idev;
1103 unsigned long lifetime;
1104 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1105
1106 *expires = jiffies;
1107
1108 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1109 if (ifa == ifp)
1110 continue;
1111 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1112 ifp->prefix_len))
1113 continue;
1114 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1115 return CLEANUP_PREFIX_RT_NOP;
1116
1117 action = CLEANUP_PREFIX_RT_EXPIRE;
1118
1119 spin_lock(&ifa->lock);
1120
1121 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1122 /*
1123 * Note: Because this address is
1124 * not permanent, lifetime <
1125 * LONG_MAX / HZ here.
1126 */
1127 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1128 *expires = ifa->tstamp + lifetime * HZ;
1129 spin_unlock(&ifa->lock);
1130 }
1131
1132 return action;
1133}
1134
1135static void
1136cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1137{
1138 struct rt6_info *rt;
1139
1140 rt = addrconf_get_prefix_route(&ifp->addr,
1141 ifp->prefix_len,
1142 ifp->idev->dev,
1143 0, RTF_GATEWAY | RTF_DEFAULT);
1144 if (rt) {
1145 if (del_rt)
1146 ip6_del_rt(rt);
1147 else {
1148 if (!(rt->rt6i_flags & RTF_EXPIRES))
1149 rt6_set_expires(rt, expires);
1150 ip6_rt_put(rt);
1151 }
1152 }
1153}
1154
1155
1da177e4
LT		 1156/* This function wants to get referenced ifp and releases it before return */
1157
1158static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1159{
4c5ff6a6 1160 int state;
5b84efec
TH		 1161 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1162 unsigned long expires;
1da177e4 1163
c15b1cca
HFS		 1164 ASSERT_RTNL();
1165
8e8e676d 1166 spin_lock_bh(&ifp->lock);
4c5ff6a6 1167 state = ifp->state;
e9d3e084 1168 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1169 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1170
1171 if (state == INET6_IFADDR_STATE_DEAD)
1172 goto out;
1da177e4 1173
5c578aed 1174 spin_lock_bh(&addrconf_hash_lock);
1175 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1176 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1177
5b84efec 1178 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1179
1da177e4 1180 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1181 list_del(&ifp->tmp_list);
1182 if (ifp->ifpub) {
1183 in6_ifa_put(ifp->ifpub);
1184 ifp->ifpub = NULL;
1da177e4 1185 }
372e6c8f 1186 __in6_ifa_put(ifp);
1da177e4 1187 }
1da177e4 1188
5b84efec
TH		 1189 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1190 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1191
5b84efec
TH		 1192 list_del_init(&ifp->if_list);
1193 __in6_ifa_put(ifp);
1194
1195 write_unlock_bh(&ifp->idev->lock);
1da177e4 1196
c15b1cca 1197 addrconf_del_dad_work(ifp);
b2238566 1198
1da177e4
LT		 1199 ipv6_ifa_notify(RTM_DELADDR, ifp);
1200
f88c91dd 1201 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1202
5b84efec
TH		 1203 if (action != CLEANUP_PREFIX_RT_NOP) {
1204 cleanup_prefix_route(ifp, expires,
1205 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1206 }
1207
c3968a85
DW		 1208 /* clean up prefsrc entries */
1209 rt6_remove_prefsrc(ifp);
4c5ff6a6 1210out:
1da177e4
LT		 1211 in6_ifa_put(ifp);
1212}
1213
1da177e4
LT		 1214static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1215{
1216 struct inet6_dev *idev = ifp->idev;
1217 struct in6_addr addr, *tmpaddr;
76f793e3 1218 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1219 unsigned long regen_advance;
1da177e4
LT		 1220 int tmp_plen;
1221 int ret = 0;
95c385b4 1222 u32 addr_flags;
76f793e3 1223 unsigned long now = jiffies;
76506a98 1224 long max_desync_factor;
7aa8e63f 1225 s32 cnf_temp_preferred_lft;
1da177e4 1226
53bd6749 1227 write_lock_bh(&idev->lock);
1da177e4
LT		 1228 if (ift) {
1229 spin_lock_bh(&ift->lock);
1230 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1231 spin_unlock_bh(&ift->lock);
1232 tmpaddr = &addr;
1233 } else {
1234 tmpaddr = NULL;
1235 }
1236retry:
1237 in6_dev_hold(idev);
1238 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1239 write_unlock_bh(&idev->lock);
f3213831 1240 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1241 in6_dev_put(idev);
1242 ret = -1;
1243 goto out;
1244 }
1245 spin_lock_bh(&ifp->lock);
1246 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1247 idev->cnf.use_tempaddr = -1; /*XXX*/
1248 spin_unlock_bh(&ifp->lock);
53bd6749 1249 write_unlock_bh(&idev->lock);
f3213831
JP		 1250 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1251 __func__);
1da177e4
LT		 1252 in6_dev_put(idev);
1253 ret = -1;
1254 goto out;
1255 }
1256 in6_ifa_hold(ifp);
1257 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
9d6280da 1258 ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1259 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1260 age = (now - ifp->tstamp) / HZ;
76506a98
JB		 1261
1262 regen_advance = idev->cnf.regen_max_retry *
1263 idev->cnf.dad_transmits *
1264 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1265
1266 /* recalculate max_desync_factor each time and update
1267 * idev->desync_factor if it's larger
1268 */
7aa8e63f 1269 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
76506a98
JB		 1270 max_desync_factor = min_t(__u32,
1271 idev->cnf.max_desync_factor,
7aa8e63f 1272 cnf_temp_preferred_lft - regen_advance);
76506a98
JB		 1273
1274 if (unlikely(idev->desync_factor > max_desync_factor)) {
1275 if (max_desync_factor > 0) {
1276 get_random_bytes(&idev->desync_factor,
1277 sizeof(idev->desync_factor));
1278 idev->desync_factor %= max_desync_factor;
1279 } else {
1280 idev->desync_factor = 0;
1281 }
1282 }
1283
1da177e4
LT		 1284 tmp_valid_lft = min_t(__u32,
1285 ifp->valid_lft,
7a876b0e 1286 idev->cnf.temp_valid_lft + age);
7aa8e63f 1287 tmp_prefered_lft = cnf_temp_preferred_lft + age -
76506a98 1288 idev->desync_factor;
76506a98 1289 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1da177e4 1290 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1291 tmp_tstamp = ifp->tstamp;
1292 spin_unlock_bh(&ifp->lock);
1293
53bd6749 1294 write_unlock_bh(&idev->lock);
95c385b4 1295
eac55bf9
BB		 1296 /* A temporary address is created only if this calculated Preferred
1297 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1298 * an implementation must not create a temporary address with a zero
1299 * Preferred Lifetime.
ecab6701
HK		 1300 * Use age calculation as in addrconf_verify to avoid unnecessary
1301 * temporary addresses being generated.
eac55bf9 1302 */
ecab6701
HK		 1303 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1304 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1305 in6_ifa_put(ifp);
1306 in6_dev_put(idev);
1307 ret = -1;
1308 goto out;
1309 }
1310
95c385b4
NH		 1311 addr_flags = IFA_F_TEMPORARY;
1312 /* set in addrconf_prefix_rcv() */
1313 if (ifp->flags & IFA_F_OPTIMISTIC)
1314 addr_flags |= IFA_F_OPTIMISTIC;
1315
4b08a8f1
HFS		 1316 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1317 ipv6_addr_scope(&addr), addr_flags,
1318 tmp_valid_lft, tmp_prefered_lft);
1319 if (IS_ERR(ift)) {
1da177e4
LT		 1320 in6_ifa_put(ifp);
1321 in6_dev_put(idev);
f3213831 1322 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1323 tmpaddr = &addr;
53bd6749 1324 write_lock_bh(&idev->lock);
1da177e4
LT		 1325 goto retry;
1326 }
1327
1328 spin_lock_bh(&ift->lock);
1329 ift->ifpub = ifp;
76f793e3 1330 ift->cstamp = now;
1da177e4
LT		 1331 ift->tstamp = tmp_tstamp;
1332 spin_unlock_bh(&ift->lock);
1333
cf22f9a2 1334 addrconf_dad_start(ift);
1da177e4
LT		 1335 in6_ifa_put(ift);
1336 in6_dev_put(idev);
1337out:
1338 return ret;
1339}
1da177e4
LT		 1340
1341/*
072047e4 1342 * Choose an appropriate source address (RFC3484)
1da177e4 1343 */
a9b05723
YH		 1344enum {
1345 IPV6_SADDR_RULE_INIT = 0,
1346 IPV6_SADDR_RULE_LOCAL,
1347 IPV6_SADDR_RULE_SCOPE,
1348 IPV6_SADDR_RULE_PREFERRED,
1349#ifdef CONFIG_IPV6_MIP6
1350 IPV6_SADDR_RULE_HOA,
1351#endif
1352 IPV6_SADDR_RULE_OIF,
1353 IPV6_SADDR_RULE_LABEL,
a9b05723 1354 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1355 IPV6_SADDR_RULE_ORCHID,
1356 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1357#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1358 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1359#endif
a9b05723
YH		 1360 IPV6_SADDR_RULE_MAX
1361};
1362
072047e4 1363struct ipv6_saddr_score {
a9b05723
YH		 1364 int rule;
1365 int addr_type;
1366 struct inet6_ifaddr *ifa;
1367 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1368 int scopedist;
1369 int matchlen;
072047e4
YH		 1370};
1371
a9b05723 1372struct ipv6_saddr_dst {
9acd9f3a 1373 const struct in6_addr *addr;
a9b05723
YH		 1374 int ifindex;
1375 int scope;
1376 int label;
7cbca67c 1377 unsigned int prefs;
a9b05723 1378};
072047e4 1379
b6f99a21 1380static inline int ipv6_saddr_preferred(int type)
1da177e4 1381{
45bb0060 1382 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1383 return 1;
1384 return 0;
1da177e4
LT		 1385}
1386
7fd2561e
EK		 1387static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1388{
1389#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1390 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1391#else
1392 return false;
1393#endif
1394}
1395
3de23255
BT		 1396static int ipv6_get_saddr_eval(struct net *net,
1397 struct ipv6_saddr_score *score,
a9b05723
YH		 1398 struct ipv6_saddr_dst *dst,
1399 int i)
1400{
1401 int ret;
1402
1403 if (i <= score->rule) {
1404 switch (i) {
1405 case IPV6_SADDR_RULE_SCOPE:
1406 ret = score->scopedist;
1407 break;
1408 case IPV6_SADDR_RULE_PREFIX:
1409 ret = score->matchlen;
1410 break;
1411 default:
1412 ret = !!test_bit(i, score->scorebits);
1413 }
1414 goto out;
1415 }
1416
1417 switch (i) {
1418 case IPV6_SADDR_RULE_INIT:
1419 /* Rule 0: remember if hiscore is not ready yet */
1420 ret = !!score->ifa;
1421 break;
1422 case IPV6_SADDR_RULE_LOCAL:
1423 /* Rule 1: Prefer same address */
1424 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1425 break;
1426 case IPV6_SADDR_RULE_SCOPE:
1427 /* Rule 2: Prefer appropriate scope
1428 *
1429 * ret
1430 * ^
1431 * -1 | d 15
1432 * ---+--+-+---> scope
1433 * |
1434 * | d is scope of the destination.
1435 * B-d | \
1436 * | \ <- smaller scope is better if
db9c7c39 1437 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1438 * | ret = B - scope (-1 <= scope >= d <= 15).
1439 * d-C-1 | /
1440 * |/ <- greater is better
1441 * -C / if scope is not enough for destination.
1442 * /| ret = scope - C (-1 <= d < scope <= 15).
1443 *
1444 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1445 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1446 * Assume B = 0 and we get C > 29.
1447 */
1448 ret = __ipv6_addr_src_scope(score->addr_type);
1449 if (ret >= dst->scope)
1450 ret = -ret;
1451 else
1452 ret -= 128; /* 30 is enough */
1453 score->scopedist = ret;
1454 break;
1455 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1456 {
a9b05723 1457 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1458 u8 avoid = IFA_F_DEPRECATED;
1459
1460 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1461 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1462 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1463 !(score->ifa->flags & avoid);
a9b05723 1464 break;
7fd2561e 1465 }
a9b05723
YH		 1466#ifdef CONFIG_IPV6_MIP6
1467 case IPV6_SADDR_RULE_HOA:
7cbca67c 1468 {
a9b05723 1469 /* Rule 4: Prefer home address */
7cbca67c
YH		 1470 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1471 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1472 break;
7cbca67c 1473 }
a9b05723
YH		 1474#endif
1475 case IPV6_SADDR_RULE_OIF:
1476 /* Rule 5: Prefer outgoing interface */
1477 ret = (!dst->ifindex ||
1478 dst->ifindex == score->ifa->idev->dev->ifindex);
1479 break;
1480 case IPV6_SADDR_RULE_LABEL:
1481 /* Rule 6: Prefer matching label */
3de23255
BT		 1482 ret = ipv6_addr_label(net,
1483 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1484 score->ifa->idev->dev->ifindex) == dst->label;
1485 break;
a9b05723 1486 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1487 {
a9b05723 1488 /* Rule 7: Prefer public address
25985edc 1489 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1490 */
7cbca67c
YH		 1491 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1492 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1493 score->ifa->idev->cnf.use_tempaddr >= 2;
1494 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1495 break;
7cbca67c 1496 }
a9b05723
YH		 1497 case IPV6_SADDR_RULE_ORCHID:
1498 /* Rule 8-: Prefer ORCHID vs ORCHID or
1499 * non-ORCHID vs non-ORCHID
1500 */
1501 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1502 ipv6_addr_orchid(dst->addr));
1503 break;
1504 case IPV6_SADDR_RULE_PREFIX:
1505 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1506 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1507 if (ret > score->ifa->prefix_len)
1508 ret = score->ifa->prefix_len;
1509 score->matchlen = ret;
a9b05723 1510 break;
7fd2561e
EK		 1511#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1512 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1513 /* Optimistic addresses still have lower precedence than other
1514 * preferred addresses.
1515 */
1516 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1517 break;
1518#endif
a9b05723
YH		 1519 default:
1520 ret = 0;
1521 }
1522
1523 if (ret)
1524 __set_bit(i, score->scorebits);
1525 score->rule = i;
1526out:
1527 return ret;
1528}
1529
c0b8da1e
YH		 1530static int __ipv6_dev_get_saddr(struct net *net,
1531 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1532 struct inet6_dev *idev,
1533 struct ipv6_saddr_score *scores,
1534 int hiscore_idx)
9131f3de 1535{
c0b8da1e 1536 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de
YH		 1537
1538 read_lock_bh(&idev->lock);
1539 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1540 int i;
1541
1542 /*
1543 * - Tentative Address (RFC2462 section 5.4)
1544 * - A tentative address is not considered
1545 * "assigned to an interface" in the traditional
1546 * sense, unless it is also flagged as optimistic.
1547 * - Candidate Source Address (section 4)
1548 * - In any case, anycast addresses, multicast
1549 * addresses, and the unspecified address MUST
1550 * NOT be included in a candidate set.
1551 */
1552 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1553 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1554 continue;
1555
1556 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1557
1558 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1559 score->addr_type & IPV6_ADDR_MULTICAST)) {
1560 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1561 idev->dev->name);
1562 continue;
1563 }
1564
1565 score->rule = -1;
1566 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1567
1568 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1569 int minihiscore, miniscore;
1570
1571 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1572 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1573
1574 if (minihiscore > miniscore) {
1575 if (i == IPV6_SADDR_RULE_SCOPE &&
1576 score->scopedist > 0) {
1577 /*
1578 * special case:
1579 * each remaining entry
1580 * has too small (not enough)
1581 * scope, because ifa entries
1582 * are sorted by their scope
1583 * values.
1584 */
1585 goto out;
1586 }
1587 break;
1588 } else if (minihiscore < miniscore) {
1589 if (hiscore->ifa)
1590 in6_ifa_put(hiscore->ifa);
1591
1592 in6_ifa_hold(score->ifa);
1593
1594 swap(hiscore, score);
c0b8da1e 1595 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1596
1597 /* restore our iterator */
1598 score->ifa = hiscore->ifa;
1599
1600 break;
1601 }
1602 }
1603 }
1604out:
1605 read_unlock_bh(&idev->lock);
c0b8da1e 1606 return hiscore_idx;
9131f3de
YH		 1607}
1608
afbac601
DA		 1609static int ipv6_get_saddr_master(struct net *net,
1610 const struct net_device *dst_dev,
1611 const struct net_device *master,
1612 struct ipv6_saddr_dst *dst,
1613 struct ipv6_saddr_score *scores,
1614 int hiscore_idx)
1615{
1616 struct inet6_dev *idev;
1617
1618 idev = __in6_dev_get(dst_dev);
1619 if (idev)
1620 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1621 scores, hiscore_idx);
1622
1623 idev = __in6_dev_get(master);
1624 if (idev)
1625 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1626 scores, hiscore_idx);
1627
1628 return hiscore_idx;
1629}
1630
b3f644fc 1631int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1632 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1633 struct in6_addr *saddr)
1da177e4 1634{
c0b8da1e 1635 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1636 struct ipv6_saddr_dst dst;
9131f3de 1637 struct inet6_dev *idev;
072047e4 1638 struct net_device *dev;
a9b05723 1639 int dst_type;
9131f3de 1640 bool use_oif_addr = false;
c0b8da1e 1641 int hiscore_idx = 0;
1da177e4 1642
a9b05723
YH		 1643 dst_type = __ipv6_addr_type(daddr);
1644 dst.addr = daddr;
1645 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1646 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1647 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1648 dst.prefs = prefs;
a9b05723 1649
c0b8da1e
YH		 1650 scores[hiscore_idx].rule = -1;
1651 scores[hiscore_idx].ifa = NULL;
1da177e4 1652
8814c4b5 1653 rcu_read_lock();
1da177e4 1654
9131f3de
YH		 1655 /* Candidate Source Address (section 4)
1656 * - multicast and link-local destination address,
1657 * the set of candidate source address MUST only
1658 * include addresses assigned to interfaces
1659 * belonging to the same link as the outgoing
1660 * interface.
1661 * (- For site-local destination addresses, the
1662 * set of candidate source addresses MUST only
1663 * include addresses assigned to interfaces
1664 * belonging to the same site as the outgoing
1665 * interface.)
3985e8a3
EK		 1666 * - "It is RECOMMENDED that the candidate source addresses
1667 * be the set of unicast addresses assigned to the
1668 * interface that will be used to send to the destination
1669 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1670 */
1671 if (dst_dev) {
3985e8a3 1672 idev = __in6_dev_get(dst_dev);
9131f3de 1673 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1674 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1675 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1676 use_oif_addr = true;
1677 }
1678 }
a9b05723 1679
9131f3de 1680 if (use_oif_addr) {
c0b8da1e 1681 if (idev)
c15df306 1682 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de 1683 } else {
afbac601
DA		 1684 const struct net_device *master;
1685 int master_idx = 0;
1686
1687 /* if dst_dev exists and is enslaved to an L3 device, then
1688 * prefer addresses from dst_dev and then the master over
1689 * any other enslaved devices in the L3 domain.
1690 */
1691 master = l3mdev_master_dev_rcu(dst_dev);
1692 if (master) {
1693 master_idx = master->ifindex;
1694
1695 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1696 master, &dst,
1697 scores, hiscore_idx);
1698
1699 if (scores[hiscore_idx].ifa)
1700 goto out;
1701 }
1702
9131f3de 1703 for_each_netdev_rcu(net, dev) {
afbac601
DA		 1704 /* only consider addresses on devices in the
1705 * same L3 domain
1706 */
1707 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1708 continue;
9131f3de
YH		 1709 idev = __in6_dev_get(dev);
1710 if (!idev)
072047e4 1711 continue;
c15df306 1712 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1713 }
1714 }
afbac601
DA		 1715
1716out:
8814c4b5 1717 rcu_read_unlock();
1da177e4 1718
c0b8da1e 1719 hiscore = &scores[hiscore_idx];
a9b05723 1720 if (!hiscore->ifa)
072047e4 1721 return -EADDRNOTAVAIL;
1ab1457c 1722
4e3fd7a0 1723 *saddr = hiscore->ifa->addr;
a9b05723 1724 in6_ifa_put(hiscore->ifa);
072047e4 1725 return 0;
1da177e4 1726}
5e5f3f0f 1727EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1728
8965779d 1729int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1730 u32 banned_flags)
b7b1bfce
HFS		 1731{
1732 struct inet6_ifaddr *ifp;
1733 int err = -EADDRNOTAVAIL;
1734
602582ca
HFS		 1735 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1736 if (ifp->scope > IFA_LINK)
1737 break;
b7b1bfce
HFS		 1738 if (ifp->scope == IFA_LINK &&
1739 !(ifp->flags & banned_flags)) {
1740 *addr = ifp->addr;
1741 err = 0;
1742 break;
1743 }
1744 }
1745 return err;
1746}
1747
95c385b4 1748int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1749 u32 banned_flags)
1da177e4
LT		 1750{
1751 struct inet6_dev *idev;
1752 int err = -EADDRNOTAVAIL;
1753
8814c4b5 1754 rcu_read_lock();
e21e8467
SH		 1755 idev = __in6_dev_get(dev);
1756 if (idev) {
1da177e4 1757 read_lock_bh(&idev->lock);
b7b1bfce 1758 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1759 read_unlock_bh(&idev->lock);
1760 }
8814c4b5 1761 rcu_read_unlock();
1da177e4
LT		 1762 return err;
1763}
1764
1765static int ipv6_count_addresses(struct inet6_dev *idev)
1766{
1767 int cnt = 0;
1768 struct inet6_ifaddr *ifp;
1769
1770 read_lock_bh(&idev->lock);
502a2ffd 1771 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1772 cnt++;
1773 read_unlock_bh(&idev->lock);
1774 return cnt;
1775}
1776
b71d1d42 1777int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1778 const struct net_device *dev, int strict)
c58da4c6
EK		 1779{
1780 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1781}
1782EXPORT_SYMBOL(ipv6_chk_addr);
1783
1784int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1785 const struct net_device *dev, int strict,
1786 u32 banned_flags)
1da177e4 1787{
eedf042a 1788 struct inet6_ifaddr *ifp;
ddbe5032 1789 unsigned int hash = inet6_addr_hash(addr);
c58da4c6 1790 u32 ifp_flags;
1da177e4 1791
5c578aed 1792 rcu_read_lock_bh();
b67bfe0d 1793 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1794 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1795 continue;
c58da4c6
EK		 1796 /* Decouple optimistic from tentative for evaluation here.
1797 * Ban optimistic addresses explicitly, when required.
1798 */
1799 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1800 ? (ifp->flags&~IFA_F_TENTATIVE)
1801 : ifp->flags;
1da177e4 1802 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1803 !(ifp_flags&banned_flags) &&
63159f29 1804 (!dev || ifp->idev->dev == dev ||
eedf042a
SH		 1805 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1806 rcu_read_unlock_bh();
1807 return 1;
1da177e4
LT		 1808 }
1809 }
5c578aed 1810
eedf042a
SH		 1811 rcu_read_unlock_bh();
1812 return 0;
1da177e4 1813}
c58da4c6 1814EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1815
3e81c6da
DM		 1816static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1817 struct net_device *dev)
1da177e4 1818{
ddbe5032 1819 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1820 struct inet6_ifaddr *ifp;
1da177e4 1821
b67bfe0d 1822 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1823 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1824 continue;
1da177e4 1825 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1826 if (!dev || ifp->idev->dev == dev)
3e81c6da 1827 return true;
1da177e4
LT		 1828 }
1829 }
3e81c6da 1830 return false;
1da177e4
LT		 1831}
1832
7df37ff3
CB		 1833/* Compares an address/prefix_len with addresses on device @dev.
1834 * If one is found it returns true.
1835 */
1836bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1837 const unsigned int prefix_len, struct net_device *dev)
1838{
1839 struct inet6_dev *idev;
1840 struct inet6_ifaddr *ifa;
1841 bool ret = false;
1842
1843 rcu_read_lock();
1844 idev = __in6_dev_get(dev);
1845 if (idev) {
1846 read_lock_bh(&idev->lock);
1847 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1848 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1849 if (ret)
1850 break;
1851 }
1852 read_unlock_bh(&idev->lock);
1853 }
1854 rcu_read_unlock();
1855
1856 return ret;
1857}
1858EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1859
b71d1d42 1860int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1861{
1862 struct inet6_dev *idev;
1863 struct inet6_ifaddr *ifa;
1864 int onlink;
1865
1866 onlink = 0;
1867 rcu_read_lock();
1868 idev = __in6_dev_get(dev);
1869 if (idev) {
1870 read_lock_bh(&idev->lock);
502a2ffd 1871 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1872 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1873 ifa->prefix_len);
1874 if (onlink)
1875 break;
1876 }
1877 read_unlock_bh(&idev->lock);
1878 }
1879 rcu_read_unlock();
1880 return onlink;
1881}
52eeeb84
YH		 1882EXPORT_SYMBOL(ipv6_chk_prefix);
1883
9acd9f3a 1884struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1885 struct net_device *dev, int strict)
1da177e4 1886{
b79d1d54 1887 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1888 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1889
5c578aed 1890 rcu_read_lock_bh();
b67bfe0d 1891 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1892 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1893 continue;
1da177e4 1894 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1895 if (!dev || ifp->idev->dev == dev ||
1da177e4 1896 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1897 result = ifp;
1da177e4
LT		 1898 in6_ifa_hold(ifp);
1899 break;
1900 }
1901 }
1902 }
5c578aed 1903 rcu_read_unlock_bh();
1da177e4 1904
b79d1d54 1905 return result;
1da177e4
LT		 1906}
1907
1da177e4
LT		 1908/* Gets referenced address, destroys ifaddr */
1909
cc411d0b 1910static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1911{
3d171f39
LR		 1912 if (dad_failed)
1913 ifp->flags |= IFA_F_DADFAILED;
1914
1da177e4
LT		 1915 if (ifp->flags&IFA_F_PERMANENT) {
1916 spin_lock_bh(&ifp->lock);
c15b1cca 1917 addrconf_del_dad_work(ifp);
1da177e4
LT		 1918 ifp->flags |= IFA_F_TENTATIVE;
1919 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1920 if (dad_failed)
1921 ipv6_ifa_notify(0, ifp);
1da177e4 1922 in6_ifa_put(ifp);
1da177e4
LT		 1923 } else if (ifp->flags&IFA_F_TEMPORARY) {
1924 struct inet6_ifaddr *ifpub;
1925 spin_lock_bh(&ifp->lock);
1926 ifpub = ifp->ifpub;
1927 if (ifpub) {
1928 in6_ifa_hold(ifpub);
1929 spin_unlock_bh(&ifp->lock);
1930 ipv6_create_tempaddr(ifpub, ifp);
1931 in6_ifa_put(ifpub);
1932 } else {
1933 spin_unlock_bh(&ifp->lock);
1934 }
1935 ipv6_del_addr(ifp);
c15b1cca 1936 } else {
1da177e4 1937 ipv6_del_addr(ifp);
c15b1cca 1938 }
1da177e4
LT		 1939}
1940
f2344a13
HX		 1941static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1942{
1943 int err = -ENOENT;
1944
8e8e676d 1945 spin_lock_bh(&ifp->lock);
f2344a13
HX		 1946 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1947 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1948 err = 0;
1949 }
8e8e676d 1950 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 1951
1952 return err;
1953}
1954
3c21edbd
YH		 1955void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1956{
1b34be74 1957 struct inet6_dev *idev = ifp->idev;
1855b7c3 1958 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 1959
853dc2e0
UB		 1960 if (addrconf_dad_end(ifp)) {
1961 in6_ifa_put(ifp);
f2344a13 1962 return;
853dc2e0 1963 }
f2344a13 1964
e87cc472
JP		 1965 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1966 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1967
5f40ef77
HFS		 1968 spin_lock_bh(&ifp->lock);
1969
1970 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1971 int scope = ifp->scope;
1972 u32 flags = ifp->flags;
1973 struct in6_addr new_addr;
1974 struct inet6_ifaddr *ifp2;
1975 u32 valid_lft, preferred_lft;
1976 int pfxlen = ifp->prefix_len;
5f40ef77
HFS		 1977 int retries = ifp->stable_privacy_retry + 1;
1978
1855b7c3 1979 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 1980 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1981 ifp->idev->dev->name);
1982 goto errdad;
1983 }
1984
1985 new_addr = ifp->addr;
1986 if (ipv6_generate_stable_address(&new_addr, retries,
1987 idev))
1988 goto errdad;
1989
1990 valid_lft = ifp->valid_lft;
1991 preferred_lft = ifp->prefered_lft;
1992
1993 spin_unlock_bh(&ifp->lock);
1b34be74 1994
5f40ef77
HFS		 1995 if (idev->cnf.max_addresses &&
1996 ipv6_count_addresses(idev) >=
1997 idev->cnf.max_addresses)
1998 goto lock_errdad;
1999
2000 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2001 ifp->idev->dev->name);
2002
2003 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
2004 scope, flags, valid_lft,
2005 preferred_lft);
2006 if (IS_ERR(ifp2))
2007 goto lock_errdad;
2008
2009 spin_lock_bh(&ifp2->lock);
2010 ifp2->stable_privacy_retry = retries;
2011 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2012 spin_unlock_bh(&ifp2->lock);
2013
1855b7c3 2014 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 2015 in6_ifa_put(ifp2);
2016lock_errdad:
2017 spin_lock_bh(&ifp->lock);
1b34be74
YH		 2018 }
2019
5f40ef77 2020errdad:
c15b1cca
HFS		 2021 /* transition from _POSTDAD to _ERRDAD */
2022 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 2023 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 2024
2025 addrconf_mod_dad_work(ifp, 0);
751eb6b6 2026 in6_ifa_put(ifp);
3c21edbd 2027}
1da177e4 2028
a9ed4a29
SD		 2029/* Join to solicited addr multicast group.
2030 * caller must hold RTNL */
b71d1d42 2031void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 2032{
2033 struct in6_addr maddr;
2034
2035 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2036 return;
2037
2038 addrconf_addr_solict_mult(addr, &maddr);
2039 ipv6_dev_mc_inc(dev, &maddr);
2040}
2041
a9ed4a29 2042/* caller must hold RTNL */
b71d1d42 2043void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 2044{
2045 struct in6_addr maddr;
2046
2047 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2048 return;
2049
2050 addrconf_addr_solict_mult(addr, &maddr);
2051 __ipv6_dev_mc_dec(idev, &maddr);
2052}
2053
a9ed4a29 2054/* caller must hold RTNL */
20380731 2055static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2056{
2057 struct in6_addr addr;
c15b1cca 2058
88ad3149 2059 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 2060 return;
1da177e4
LT		 2061 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2062 if (ipv6_addr_any(&addr))
2063 return;
013b4d90 2064 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 2065}
2066
a9ed4a29 2067/* caller must hold RTNL */
20380731 2068static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2069{
2070 struct in6_addr addr;
c15b1cca 2071
88ad3149 2072 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 2073 return;
1da177e4
LT		 2074 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2075 if (ipv6_addr_any(&addr))
2076 return;
2077 __ipv6_dev_ac_dec(ifp->idev, &addr);
2078}
2079
8a7a4b47 2080static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
06a4c1c5 2081{
8a7a4b47
AA		 2082 switch (dev->addr_len) {
2083 case ETH_ALEN:
9dae2e03
LAD		 2084 memcpy(eui, dev->dev_addr, 3);
2085 eui[3] = 0xFF;
2086 eui[4] = 0xFE;
2087 memcpy(eui + 5, dev->dev_addr + 3, 3);
2088 break;
8a7a4b47
AA		 2089 case EUI64_ADDR_LEN:
2090 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2091 eui[0] ^= 2;
2092 break;
2093 default:
06a4c1c5 2094 return -1;
8a7a4b47
AA		 2095 }
2096
06a4c1c5 2097 return 0;
2098}
2099
cb6bf355
YH		 2100static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2101{
2102 union fwnet_hwaddr *ha;
2103
2104 if (dev->addr_len != FWNET_ALEN)
2105 return -1;
2106
2107 ha = (union fwnet_hwaddr *)dev->dev_addr;
2108
2109 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2110 eui[0] ^= 2;
2111 return 0;
2112}
2113
073a8e0e
YH		 2114static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2115{
2116 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2117 if (dev->addr_len != ARCNET_ALEN)
2118 return -1;
2119 memset(eui, 0, 7);
8e5e8f30 2120 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 2121 return 0;
2122}
2123
2124static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2125{
2126 if (dev->addr_len != INFINIBAND_ALEN)
2127 return -1;
2128 memcpy(eui, dev->dev_addr + 12, 8);
2129 eui[0] |= 2;
2130 return 0;
2131}
2132
c61393ea 2133static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2134{
9af28511
SH		 2135 if (addr == 0)
2136 return -1;
dfd982ba
YH		 2137 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2138 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2139 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2140 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2141 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2142 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2143 eui[1] = 0;
2144 eui[2] = 0x5E;
2145 eui[3] = 0xFE;
2146 memcpy(eui + 4, &addr, 4);
2147 return 0;
2148}
dfd982ba
YH		 2149
2150static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2151{
2152 if (dev->priv_flags & IFF_ISATAP)
2153 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2154 return -1;
2155}
2156
aee80b54 2157static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2158{
2159 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2160}
2161
e837735e
ND		 2162static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2163{
2164 memcpy(eui, dev->perm_addr, 3);
2165 memcpy(eui + 5, dev->perm_addr + 3, 3);
2166 eui[3] = 0xFF;
2167 eui[4] = 0xFE;
2168 eui[0] ^= 2;
2169 return 0;
2170}
2171
1da177e4
LT		 2172static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2173{
2174 switch (dev->type) {
2175 case ARPHRD_ETHER:
2176 case ARPHRD_FDDI:
073a8e0e 2177 return addrconf_ifid_eui48(eui, dev);
1da177e4 2178 case ARPHRD_ARCNET:
073a8e0e 2179 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2180 case ARPHRD_INFINIBAND:
073a8e0e 2181 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2182 case ARPHRD_SIT:
dfd982ba 2183 return addrconf_ifid_sit(eui, dev);
aee80b54 2184 case ARPHRD_IPGRE:
45ce0fd1 2185 case ARPHRD_TUNNEL:
aee80b54 2186 return addrconf_ifid_gre(eui, dev);
e74bccb8 2187 case ARPHRD_6LOWPAN:
8a7a4b47 2188 return addrconf_ifid_6lowpan(eui, dev);
cb6bf355
YH		 2189 case ARPHRD_IEEE1394:
2190 return addrconf_ifid_ieee1394(eui, dev);
e837735e 2191 case ARPHRD_TUNNEL6:
45ce0fd1 2192 case ARPHRD_IP6GRE:
e837735e 2193 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2194 }
2195 return -1;
2196}
2197
2198static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2199{
2200 int err = -1;
2201 struct inet6_ifaddr *ifp;
2202
2203 read_lock_bh(&idev->lock);
602582ca
HFS		 2204 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2205 if (ifp->scope > IFA_LINK)
2206 break;
1da177e4
LT		 2207 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2208 memcpy(eui, ifp->addr.s6_addr+8, 8);
2209 err = 0;
2210 break;
2211 }
2212 }
2213 read_unlock_bh(&idev->lock);
2214 return err;
2215}
2216
1da177e4 2217/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
9d6280da 2218static void ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2219{
1da177e4 2220regen:
955189ef 2221 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2222 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2223
2224 /*
2225 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2226 * check if generated address is not inappropriate
2227 *
2228 * - Reserved subnet anycast (RFC 2526)
2229 * 11111101 11....11 1xxxxxxx
c7dc89c0 2230 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2231 * 00-00-5E-FE-xx-xx-xx-xx
2232 * - value 0
2233 * - XXX: already assigned to an address on the device
2234 */
1ab1457c 2235 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2236 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2237 (idev->rndid[7]&0x80))
2238 goto regen;
2239 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2240 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2241 goto regen;
2242 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2243 goto regen;
2244 }
1da177e4
LT		 2245}
2246
9d6280da 2247static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2248{
1da177e4 2249 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
9d6280da 2250 ipv6_regen_rndid(idev);
1da177e4 2251}
1da177e4
LT		 2252
2253/*
2254 * Add prefix route.
2255 */
2256
2257static void
2258addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2259 unsigned long expires, u32 flags)
1da177e4 2260{
86872cb5 2261 struct fib6_config cfg = {
ca254490 2262 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
86872cb5
TG		 2263 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2264 .fc_ifindex = dev->ifindex,
2265 .fc_expires = expires,
2266 .fc_dst_len = plen,
2267 .fc_flags = RTF_UP | flags,
c346dca1 2268 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2269 .fc_protocol = RTPROT_KERNEL,
86872cb5 2270 };
1da177e4 2271
4e3fd7a0 2272 cfg.fc_dst = *pfx;
1da177e4
LT		 2273
2274 /* Prevent useless cloning on PtP SIT.
2275 This thing is done here expecting that the whole
2276 class of non-broadcast devices need not cloning.
2277 */
07a93626 2278#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2279 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2280 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2281#endif
1da177e4 2282
86872cb5 2283 ip6_route_add(&cfg);
1da177e4
LT		 2284}
2285
14ef37b6
AH		 2286
2287static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2288 int plen,
2289 const struct net_device *dev,
2290 u32 flags, u32 noflags)
2291{
2292 struct fib6_node *fn;
2293 struct rt6_info *rt = NULL;
2294 struct fib6_table *table;
ca254490 2295 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2296
ca254490 2297 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2298 if (!table)
14ef37b6
AH		 2299 return NULL;
2300
5744dd9b 2301 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2302 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2303 if (!fn)
2304 goto out;
1f56a01f
MKL		 2305
2306 noflags |= RTF_CACHE;
14ef37b6 2307 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2308 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2309 continue;
2310 if ((rt->rt6i_flags & flags) != flags)
2311 continue;
85da53bf 2312 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2313 continue;
2314 dst_hold(&rt->dst);
2315 break;
2316 }
2317out:
5744dd9b 2318 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2319 return rt;
2320}
2321
2322
1da177e4
LT		 2323/* Create "default" multicast route to the interface */
2324
2325static void addrconf_add_mroute(struct net_device *dev)
2326{
86872cb5 2327 struct fib6_config cfg = {
ca254490 2328 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2329 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2330 .fc_ifindex = dev->ifindex,
2331 .fc_dst_len = 8,
2332 .fc_flags = RTF_UP,
c346dca1 2333 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2334 };
2335
2336 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2337
2338 ip6_route_add(&cfg);
1da177e4
LT		 2339}
2340
1da177e4
LT		 2341static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2342{
2343 struct inet6_dev *idev;
2344
2345 ASSERT_RTNL();
2346
e21e8467
SH		 2347 idev = ipv6_find_idev(dev);
2348 if (!idev)
64e724f6
BH		 2349 return ERR_PTR(-ENOBUFS);
2350
2351 if (idev->cnf.disable_ipv6)
2352 return ERR_PTR(-EACCES);
1da177e4
LT		 2353
2354 /* Add default multicast route */
ba46ee4c 2355 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
4af04aba 2356 addrconf_add_mroute(dev);
1da177e4 2357
1da177e4
LT		 2358 return idev;
2359}
2360
53bd6749
JP		 2361static void manage_tempaddrs(struct inet6_dev *idev,
2362 struct inet6_ifaddr *ifp,
2363 __u32 valid_lft, __u32 prefered_lft,
2364 bool create, unsigned long now)
2365{
2366 u32 flags;
2367 struct inet6_ifaddr *ift;
2368
2369 read_lock_bh(&idev->lock);
2370 /* update all temporary addresses in the list */
2371 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2372 int age, max_valid, max_prefered;
2373
2374 if (ifp != ift->ifpub)
2375 continue;
2376
2377 /* RFC 4941 section 3.3:
2378 * If a received option will extend the lifetime of a public
2379 * address, the lifetimes of temporary addresses should
2380 * be extended, subject to the overall constraint that no
2381 * temporary addresses should ever remain "valid" or "preferred"
2382 * for a time longer than (TEMP_VALID_LIFETIME) or
2383 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2384 */
2385 age = (now - ift->cstamp) / HZ;
2386 max_valid = idev->cnf.temp_valid_lft - age;
2387 if (max_valid < 0)
2388 max_valid = 0;
2389
2390 max_prefered = idev->cnf.temp_prefered_lft -
76506a98 2391 idev->desync_factor - age;
53bd6749
JP		 2392 if (max_prefered < 0)
2393 max_prefered = 0;
2394
2395 if (valid_lft > max_valid)
2396 valid_lft = max_valid;
2397
2398 if (prefered_lft > max_prefered)
2399 prefered_lft = max_prefered;
2400
2401 spin_lock(&ift->lock);
2402 flags = ift->flags;
2403 ift->valid_lft = valid_lft;
2404 ift->prefered_lft = prefered_lft;
2405 ift->tstamp = now;
2406 if (prefered_lft > 0)
2407 ift->flags &= ~IFA_F_DEPRECATED;
2408
2409 spin_unlock(&ift->lock);
2410 if (!(flags&IFA_F_TENTATIVE))
2411 ipv6_ifa_notify(0, ift);
2412 }
2413
2414 if ((create || list_empty(&idev->tempaddr_list)) &&
2415 idev->cnf.use_tempaddr > 0) {
2416 /* When a new public address is created as described
2417 * in [ADDRCONF], also create a new temporary address.
2418 * Also create a temporary address if it's enabled but
2419 * no temporary address currently exists.
2420 */
2421 read_unlock_bh(&idev->lock);
2422 ipv6_create_tempaddr(ifp, NULL);
2423 } else {
2424 read_unlock_bh(&idev->lock);
2425 }
2426}
2427
cc9da6cc
BM		 2428static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2429{
d35a00b8
FJ		 2430 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2431 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc
BM		 2432}
2433
cc84b3c6
AA		 2434int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2435 const struct prefix_info *pinfo,
2436 struct inet6_dev *in6_dev,
2437 const struct in6_addr *addr, int addr_type,
2438 u32 addr_flags, bool sllao, bool tokenized,
2439 __u32 valid_lft, u32 prefered_lft)
4f672235
AA		 2440{
2441 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2442 int create = 0, update_lft = 0;
2443
2444 if (!ifp && valid_lft) {
2445 int max_addresses = in6_dev->cnf.max_addresses;
2446
2447#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2448 if (in6_dev->cnf.optimistic_dad &&
2449 !net->ipv6.devconf_all->forwarding && sllao)
2450 addr_flags |= IFA_F_OPTIMISTIC;
2451#endif
2452
2453 /* Do not allow to create too much of autoconfigured
2454 * addresses; this would be too easy way to crash kernel.
2455 */
2456 if (!max_addresses ||
2457 ipv6_count_addresses(in6_dev) < max_addresses)
2458 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2459 pinfo->prefix_len,
2460 addr_type&IPV6_ADDR_SCOPE_MASK,
2461 addr_flags, valid_lft,
2462 prefered_lft);
2463
2464 if (IS_ERR_OR_NULL(ifp))
2465 return -1;
2466
2467 update_lft = 0;
2468 create = 1;
2469 spin_lock_bh(&ifp->lock);
2470 ifp->flags |= IFA_F_MANAGETEMPADDR;
2471 ifp->cstamp = jiffies;
2472 ifp->tokenized = tokenized;
2473 spin_unlock_bh(&ifp->lock);
2474 addrconf_dad_start(ifp);
2475 }
2476
2477 if (ifp) {
2478 u32 flags;
2479 unsigned long now;
2480 u32 stored_lft;
2481
2482 /* update lifetime (RFC2462 5.5.3 e) */
2483 spin_lock_bh(&ifp->lock);
2484 now = jiffies;
2485 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2486 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2487 else
2488 stored_lft = 0;
2489 if (!update_lft && !create && stored_lft) {
2490 const u32 minimum_lft = min_t(u32,
2491 stored_lft, MIN_VALID_LIFETIME);
2492 valid_lft = max(valid_lft, minimum_lft);
2493
2494 /* RFC4862 Section 5.5.3e:
2495 * "Note that the preferred lifetime of the
2496 * corresponding address is always reset to
2497 * the Preferred Lifetime in the received
2498 * Prefix Information option, regardless of
2499 * whether the valid lifetime is also reset or
2500 * ignored."
2501 *
2502 * So we should always update prefered_lft here.
2503 */
2504 update_lft = 1;
2505 }
2506
2507 if (update_lft) {
2508 ifp->valid_lft = valid_lft;
2509 ifp->prefered_lft = prefered_lft;
2510 ifp->tstamp = now;
2511 flags = ifp->flags;
2512 ifp->flags &= ~IFA_F_DEPRECATED;
2513 spin_unlock_bh(&ifp->lock);
2514
2515 if (!(flags&IFA_F_TENTATIVE))
2516 ipv6_ifa_notify(0, ifp);
2517 } else
2518 spin_unlock_bh(&ifp->lock);
2519
2520 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2521 create, now);
2522
2523 in6_ifa_put(ifp);
2524 addrconf_verify();
2525 }
2526
2527 return 0;
2528}
cc84b3c6 2529EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
4f672235 2530
e6bff995 2531void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2532{
2533 struct prefix_info *pinfo;
2534 __u32 valid_lft;
2535 __u32 prefered_lft;
4f672235 2536 int addr_type, err;
64236f3f 2537 u32 addr_flags = 0;
1da177e4 2538 struct inet6_dev *in6_dev;
56d417b1 2539 struct net *net = dev_net(dev);
1da177e4
LT		 2540
2541 pinfo = (struct prefix_info *) opt;
1ab1457c 2542
1da177e4 2543 if (len < sizeof(struct prefix_info)) {
ba3542e1 2544 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2545 return;
2546 }
1ab1457c 2547
1da177e4
LT		 2548 /*
2549 * Validation checks ([ADDRCONF], page 19)
2550 */
2551
2552 addr_type = ipv6_addr_type(&pinfo->prefix);
2553
2554 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2555 return;
2556
2557 valid_lft = ntohl(pinfo->valid);
2558 prefered_lft = ntohl(pinfo->prefered);
2559
2560 if (prefered_lft > valid_lft) {
e87cc472 2561 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2562 return;
2563 }
2564
2565 in6_dev = in6_dev_get(dev);
2566
63159f29 2567 if (!in6_dev) {
e87cc472
JP		 2568 net_dbg_ratelimited("addrconf: device %s not configured\n",
2569 dev->name);
1da177e4
LT		 2570 return;
2571 }
2572
2573 /*
2574 * Two things going on here:
2575 * 1) Add routes for on-link prefixes
2576 * 2) Configure prefixes with the auto flag set
2577 */
2578
4bed72e4
YH		 2579 if (pinfo->onlink) {
2580 struct rt6_info *rt;
2581 unsigned long rt_expires;
2582
6f704992
YH		 2583 /* Avoid arithmetic overflow. Really, we could
2584 * save rt_expires in seconds, likely valid_lft,
2585 * but it would require division in fib gc, that it
2586 * not good.
2587 */
4bed72e4
YH		 2588 if (HZ > USER_HZ)
2589 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2590 else
2591 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2592
4bed72e4
YH		 2593 if (addrconf_finite_timeout(rt_expires))
2594 rt_expires *= HZ;
1da177e4 2595
14ef37b6
AH		 2596 rt = addrconf_get_prefix_route(&pinfo->prefix,
2597 pinfo->prefix_len,
2598 dev,
2599 RTF_ADDRCONF | RTF_PREFIX_RT,
2600 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2601
14ef37b6 2602 if (rt) {
6f704992
YH		 2603 /* Autoconf prefix route */
2604 if (valid_lft == 0) {
2605 ip6_del_rt(rt);
2606 rt = NULL;
4bed72e4 2607 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2608 /* not infinity */
1716a961 2609 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2610 } else {
1716a961 2611 rt6_clean_expires(rt);
1da177e4
LT		 2612 }
2613 } else if (valid_lft) {
6f704992 2614 clock_t expires = 0;
4bed72e4
YH		 2615 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2616 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2617 /* not infinity */
2618 flags |= RTF_EXPIRES;
2619 expires = jiffies_to_clock_t(rt_expires);
2620 }
1da177e4 2621 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2622 dev, expires, flags);
1da177e4 2623 }
94e187c0 2624 ip6_rt_put(rt);
1da177e4
LT		 2625 }
2626
2627 /* Try to figure out our local address for this prefix */
2628
2629 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1da177e4 2630 struct in6_addr addr;
f997c55c 2631 bool tokenized = false, dev_addr_generated = false;
1da177e4
LT		 2632
2633 if (pinfo->prefix_len == 64) {
2634 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2635
2636 if (!ipv6_addr_any(&in6_dev->token)) {
2637 read_lock_bh(&in6_dev->lock);
2638 memcpy(addr.s6_addr + 8,
2639 in6_dev->token.s6_addr + 8, 8);
2640 read_unlock_bh(&in6_dev->lock);
617fe29d 2641 tokenized = true;
cc9da6cc 2642 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2643 !ipv6_generate_stable_address(&addr, 0,
2644 in6_dev)) {
64236f3f 2645 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2646 goto ok;
f53adae4
DB		 2647 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2648 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
4f672235 2649 goto put;
f997c55c
AA		 2650 } else {
2651 dev_addr_generated = true;
1da177e4
LT		 2652 }
2653 goto ok;
2654 }
e87cc472
JP		 2655 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2656 pinfo->prefix_len);
4f672235 2657 goto put;
1da177e4
LT		 2658
2659ok:
4f672235
AA		 2660 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2661 &addr, addr_type,
2662 addr_flags, sllao,
2663 tokenized, valid_lft,
2664 prefered_lft);
2665 if (err)
2666 goto put;
f997c55c
AA		 2667
2668 /* Ignore error case here because previous prefix add addr was
2669 * successful which will be notified.
2670 */
2671 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2672 addr_type, addr_flags, sllao,
2673 tokenized, valid_lft,
2674 prefered_lft,
2675 dev_addr_generated);
1da177e4
LT		 2676 }
2677 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
4f672235 2678put:
1da177e4
LT		 2679 in6_dev_put(in6_dev);
2680}
2681
2682/*
2683 * Set destination address.
2684 * Special case for SIT interfaces where we create a new "virtual"
2685 * device.
2686 */
af284937 2687int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2688{
2689 struct in6_ifreq ireq;
2690 struct net_device *dev;
2691 int err = -EINVAL;
2692
2693 rtnl_lock();
2694
2695 err = -EFAULT;
2696 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2697 goto err_exit;
2698
af284937 2699 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2700
2701 err = -ENODEV;
63159f29 2702 if (!dev)
1da177e4
LT		 2703 goto err_exit;
2704
07a93626 2705#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2706 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2707 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2708 struct ifreq ifr;
1da177e4
LT		 2709 struct ip_tunnel_parm p;
2710
2711 err = -EADDRNOTAVAIL;
2712 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2713 goto err_exit;
2714
2715 memset(&p, 0, sizeof(p));
2716 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2717 p.iph.saddr = 0;
2718 p.iph.version = 4;
2719 p.iph.ihl = 5;
2720 p.iph.protocol = IPPROTO_IPV6;
2721 p.iph.ttl = 64;
d20b3109 2722 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2723
5bc3eb7e
SH		 2724 if (ops->ndo_do_ioctl) {
2725 mm_segment_t oldfs = get_fs();
2726
2727 set_fs(KERNEL_DS);
2728 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2729 set_fs(oldfs);
2730 } else
2731 err = -EOPNOTSUPP;
1da177e4
LT		 2732
2733 if (err == 0) {
2734 err = -ENOBUFS;
af284937
DL		 2735 dev = __dev_get_by_name(net, p.name);
2736 if (!dev)
1da177e4
LT		 2737 goto err_exit;
2738 err = dev_open(dev);
2739 }
2740 }
0be669bb 2741#endif
1da177e4
LT		 2742
2743err_exit:
2744 rtnl_unlock();
2745 return err;
2746}
2747
93a714d6
MC		 2748static int ipv6_mc_config(struct sock *sk, bool join,
2749 const struct in6_addr *addr, int ifindex)
2750{
2751 int ret;
2752
2753 ASSERT_RTNL();
2754
2755 lock_sock(sk);
2756 if (join)
54ff9ef3 2757 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2758 else
54ff9ef3 2759 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2760 release_sock(sk);
2761
2762 return ret;
2763}
2764
1da177e4
LT		 2765/*
2766 * Manual configuration of address on an interface
2767 */
479840ff
JP		 2768static int inet6_addr_add(struct net *net, int ifindex,
2769 const struct in6_addr *pfx,
caeaba79 2770 const struct in6_addr *peer_pfx,
479840ff
JP		 2771 unsigned int plen, __u32 ifa_flags,
2772 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2773{
2774 struct inet6_ifaddr *ifp;
2775 struct inet6_dev *idev;
2776 struct net_device *dev;
93a714d6
MC		 2777 unsigned long timeout;
2778 clock_t expires;
1da177e4 2779 int scope;
6f704992 2780 u32 flags;
1da177e4
LT		 2781
2782 ASSERT_RTNL();
1ab1457c 2783
24ef0da7
TG		 2784 if (plen > 128)
2785 return -EINVAL;
2786
0778769d
NT		 2787 /* check the lifetime */
2788 if (!valid_lft || prefered_lft > valid_lft)
2789 return -EINVAL;
2790
53bd6749
JP		 2791 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2792 return -EINVAL;
2793
af284937
DL		 2794 dev = __dev_get_by_index(net, ifindex);
2795 if (!dev)
1da177e4 2796 return -ENODEV;
1ab1457c 2797
64e724f6
BH		 2798 idev = addrconf_add_dev(dev);
2799 if (IS_ERR(idev))
2800 return PTR_ERR(idev);
1da177e4 2801
93a714d6
MC		 2802 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2803 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2804 true, pfx, ifindex);
2805
2806 if (ret < 0)
2807 return ret;
2808 }
2809
1da177e4
LT		 2810 scope = ipv6_addr_scope(pfx);
2811
4bed72e4
YH		 2812 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2813 if (addrconf_finite_timeout(timeout)) {
2814 expires = jiffies_to_clock_t(timeout * HZ);
2815 valid_lft = timeout;
6f704992 2816 flags = RTF_EXPIRES;
4bed72e4
YH		 2817 } else {
2818 expires = 0;
2819 flags = 0;
2820 ifa_flags |= IFA_F_PERMANENT;
6f704992 2821 }
0778769d 2822
4bed72e4
YH		 2823 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2824 if (addrconf_finite_timeout(timeout)) {
2825 if (timeout == 0)
2826 ifa_flags |= IFA_F_DEPRECATED;
2827 prefered_lft = timeout;
2828 }
0778769d 2829
8a226b2c
JB		 2830 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2831 valid_lft, prefered_lft);
0778769d 2832
1da177e4 2833 if (!IS_ERR(ifp)) {
761aac73
TH		 2834 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2835 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2836 expires, flags);
2837 }
2838
95c385b4
NH		 2839 /*
2840 * Note that section 3.1 of RFC 4429 indicates
2841 * that the Optimistic flag should not be set for
2842 * manually configured addresses
2843 */
cf22f9a2 2844 addrconf_dad_start(ifp);
53bd6749
JP		 2845 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2846 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2847 true, jiffies);
1da177e4 2848 in6_ifa_put(ifp);
c15b1cca 2849 addrconf_verify_rtnl();
1da177e4 2850 return 0;
93a714d6
MC		 2851 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2852 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2853 false, pfx, ifindex);
1da177e4
LT		 2854 }
2855
2856 return PTR_ERR(ifp);
2857}
2858
6046d5b4
HK		 2859static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2860 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2861{
2862 struct inet6_ifaddr *ifp;
2863 struct inet6_dev *idev;
2864 struct net_device *dev;
1ab1457c 2865
24ef0da7
TG		 2866 if (plen > 128)
2867 return -EINVAL;
2868
af284937
DL		 2869 dev = __dev_get_by_index(net, ifindex);
2870 if (!dev)
1da177e4
LT		 2871 return -ENODEV;
2872
e5d08d71 2873 idev = __in6_dev_get(dev);
63159f29 2874 if (!idev)
1da177e4
LT		 2875 return -ENXIO;
2876
2877 read_lock_bh(&idev->lock);
502a2ffd 2878 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2879 if (ifp->prefix_len == plen &&
2880 ipv6_addr_equal(pfx, &ifp->addr)) {
2881 in6_ifa_hold(ifp);
2882 read_unlock_bh(&idev->lock);
1ab1457c 2883
6046d5b4
HK		 2884 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2885 (ifa_flags & IFA_F_MANAGETEMPADDR))
2886 manage_tempaddrs(idev, ifp, 0, 0, false,
2887 jiffies);
1da177e4 2888 ipv6_del_addr(ifp);
6046d5b4 2889 addrconf_verify_rtnl();
93a714d6
MC		 2890 if (ipv6_addr_is_multicast(pfx)) {
2891 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2892 false, pfx, dev->ifindex);
2893 }
1da177e4
LT		 2894 return 0;
2895 }
2896 }
2897 read_unlock_bh(&idev->lock);
2898 return -EADDRNOTAVAIL;
2899}
2900
2901
af284937 2902int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2903{
2904 struct in6_ifreq ireq;
2905 int err;
1ab1457c 2906
af31f412 2907 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2908 return -EPERM;
1ab1457c 2909
1da177e4
LT		 2910 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2911 return -EFAULT;
2912
2913 rtnl_lock();
caeaba79 2914 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2915 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2916 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2917 rtnl_unlock();
2918 return err;
2919}
2920
af284937 2921int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2922{
2923 struct in6_ifreq ireq;
2924 int err;
1ab1457c 2925
af31f412 2926 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2927 return -EPERM;
2928
2929 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2930 return -EFAULT;
2931
2932 rtnl_lock();
6046d5b4 2933 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2934 ireq.ifr6_prefixlen);
1da177e4
LT		 2935 rtnl_unlock();
2936 return err;
2937}
2938
b5f348e5
IJ		 2939static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2940 int plen, int scope)
2941{
2942 struct inet6_ifaddr *ifp;
2943
8a226b2c 2944 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2945 scope, IFA_F_PERMANENT,
2946 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2947 if (!IS_ERR(ifp)) {
2948 spin_lock_bh(&ifp->lock);
2949 ifp->flags &= ~IFA_F_TENTATIVE;
2950 spin_unlock_bh(&ifp->lock);
764d3be6 2951 rt_genid_bump_ipv6(dev_net(idev->dev));
b5f348e5
IJ		 2952 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2953 in6_ifa_put(ifp);
2954 }
2955}
2956
07a93626 2957#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2958static void sit_add_v4_addrs(struct inet6_dev *idev)
2959{
1da177e4
LT		 2960 struct in6_addr addr;
2961 struct net_device *dev;
c346dca1 2962 struct net *net = dev_net(idev->dev);
929c9cf3 2963 int scope, plen;
f0e2acfa 2964 u32 pflags = 0;
1da177e4
LT		 2965
2966 ASSERT_RTNL();
2967
2968 memset(&addr, 0, sizeof(struct in6_addr));
2969 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2970
2971 if (idev->dev->flags&IFF_POINTOPOINT) {
2972 addr.s6_addr32[0] = htonl(0xfe800000);
2973 scope = IFA_LINK;
929c9cf3 2974 plen = 64;
1da177e4
LT		 2975 } else {
2976 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2977 plen = 96;
f0e2acfa 2978 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2979 }
2980
2981 if (addr.s6_addr32[3]) {
929c9cf3 2982 add_addr(idev, &addr, plen, scope);
f0e2acfa 2983 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2984 return;
2985 }
2986
6fda7350 2987 for_each_netdev(net, dev) {
8e5e8f30 2988 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2989 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2990 struct in_ifaddr *ifa;
1da177e4
LT		 2991
2992 int flag = scope;
2993
2994 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2995
2996 addr.s6_addr32[3] = ifa->ifa_local;
2997
2998 if (ifa->ifa_scope == RT_SCOPE_LINK)
2999 continue;
3000 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3001 if (idev->dev->flags&IFF_POINTOPOINT)
3002 continue;
3003 flag |= IFA_HOST;
3004 }
1da177e4 3005
b5f348e5 3006 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 3007 addrconf_prefix_route(&addr, plen, idev->dev, 0,
3008 pflags);
1da177e4
LT		 3009 }
3010 }
1ab1457c 3011 }
1da177e4 3012}
0be669bb 3013#endif
1da177e4
LT		 3014
3015static void init_loopback(struct net_device *dev)
3016{
3017 struct inet6_dev *idev;
25fb6ca4
BK		 3018 struct net_device *sp_dev;
3019 struct inet6_ifaddr *sp_ifa;
3020 struct rt6_info *sp_rt;
1da177e4
LT		 3021
3022 /* ::1 */
3023
3024 ASSERT_RTNL();
3025
e5d08d71 3026 idev = ipv6_find_idev(dev);
63159f29 3027 if (!idev) {
91df42be 3028 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3029 return;
3030 }
3031
b5f348e5 3032 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 3033
3034 /* Add routes to other interface's IPv6 addresses */
3035 for_each_netdev(dev_net(dev), sp_dev) {
3036 if (!strcmp(sp_dev->name, dev->name))
3037 continue;
3038
3039 idev = __in6_dev_get(sp_dev);
3040 if (!idev)
3041 continue;
3042
3043 read_lock_bh(&idev->lock);
3044 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
3045
3046 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
3047 continue;
3048
33d99113
G		 3049 if (sp_ifa->rt) {
3050 /* This dst has been added to garbage list when
3051 * lo device down, release this obsolete dst and
3052 * reallocate a new router for ifa.
3053 */
a220445f 3054 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
33d99113
G		 3055 ip6_rt_put(sp_ifa->rt);
3056 sp_ifa->rt = NULL;
3057 } else {
3058 continue;
3059 }
3060 }
a881ae1f 3061
57ec0afe 3062 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 3063
3064 /* Failure cases are ignored */
534c8779
G		 3065 if (!IS_ERR(sp_rt)) {
3066 sp_ifa->rt = sp_rt;
25fb6ca4 3067 ip6_ins_rt(sp_rt);
534c8779 3068 }
25fb6ca4
BK		 3069 }
3070 read_unlock_bh(&idev->lock);
3071 }
1da177e4
LT		 3072}
3073
2ad3ed59
AA		 3074void addrconf_add_linklocal(struct inet6_dev *idev,
3075 const struct in6_addr *addr, u32 flags)
1da177e4 3076{
8e5e8f30 3077 struct inet6_ifaddr *ifp;
64236f3f 3078 u32 addr_flags = flags | IFA_F_PERMANENT;
95c385b4
NH		 3079
3080#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3081 if (idev->cnf.optimistic_dad &&
702beb87 3082 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 3083 addr_flags |= IFA_F_OPTIMISTIC;
3084#endif
1da177e4 3085
07edd741
HFS		 3086 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3087 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 3088 if (!IS_ERR(ifp)) {
46d48046 3089 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 3090 addrconf_dad_start(ifp);
1da177e4
LT		 3091 in6_ifa_put(ifp);
3092 }
3093}
2ad3ed59 3094EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
1da177e4 3095
622c81d5
HFS		 3096static bool ipv6_reserved_interfaceid(struct in6_addr address)
3097{
3098 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3099 return true;
3100
3101 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3102 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3103 return true;
3104
3105 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3106 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3107 return true;
3108
3109 return false;
3110}
3111
3112static int ipv6_generate_stable_address(struct in6_addr *address,
3113 u8 dad_count,
3114 const struct inet6_dev *idev)
3115{
622c81d5
HFS		 3116 static DEFINE_SPINLOCK(lock);
3117 static __u32 digest[SHA_DIGEST_WORDS];
3118 static __u32 workspace[SHA_WORKSPACE_WORDS];
3119
3120 static union {
3121 char __data[SHA_MESSAGE_BYTES];
3122 struct {
3123 struct in6_addr secret;
ff40217e 3124 __be32 prefix[2];
622c81d5
HFS		 3125 unsigned char hwaddr[MAX_ADDR_LEN];
3126 u8 dad_count;
3127 } __packed;
3128 } data;
3129
3130 struct in6_addr secret;
3131 struct in6_addr temp;
3132 struct net *net = dev_net(idev->dev);
3133
3134 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3135
3136 if (idev->cnf.stable_secret.initialized)
3137 secret = idev->cnf.stable_secret.secret;
3138 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3139 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3140 else
3141 return -1;
3142
3143retry:
3144 spin_lock_bh(&lock);
3145
3146 sha_init(digest);
3147 memset(&data, 0, sizeof(data));
3148 memset(workspace, 0, sizeof(workspace));
3149 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3150 data.prefix[0] = address->s6_addr32[0];
3151 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3152 data.secret = secret;
3153 data.dad_count = dad_count;
3154
3155 sha_transform(digest, data.__data, workspace);
3156
3157 temp = *address;
ff40217e
HFS		 3158 temp.s6_addr32[2] = (__force __be32)digest[0];
3159 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3160
3161 spin_unlock_bh(&lock);
3162
3163 if (ipv6_reserved_interfaceid(temp)) {
3164 dad_count++;
1855b7c3 3165 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3166 return -1;
3167 goto retry;
3168 }
3169
3170 *address = temp;
3171 return 0;
3172}
3173
cc9da6cc
BM		 3174static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3175{
3176 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3177
3178 if (s->initialized)
3179 return;
3180 s = &idev->cnf.stable_secret;
3181 get_random_bytes(&s->secret, sizeof(s->secret));
3182 s->initialized = true;
3183}
3184
bc91b0f0
JP		 3185static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3186{
622c81d5
HFS		 3187 struct in6_addr addr;
3188
ca254490
DA		 3189 /* no link local addresses on L3 master devices */
3190 if (netif_is_l3_master(idev->dev))
3191 return;
3192
622c81d5 3193 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3194
d35a00b8 3195 switch (idev->cnf.addr_gen_mode) {
cc9da6cc
BM		 3196 case IN6_ADDR_GEN_MODE_RANDOM:
3197 ipv6_gen_mode_random_init(idev);
3198 /* fallthrough */
3199 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3200 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3201 addrconf_add_linklocal(idev, &addr,
3202 IFA_F_STABLE_PRIVACY);
622c81d5
HFS		 3203 else if (prefix_route)
3204 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3205 break;
3206 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3207 /* addrconf_add_linklocal also adds a prefix_route and we
3208 * only need to care about prefix routes if ipv6_generate_eui64
3209 * couldn't generate one.
3210 */
3211 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3212 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0
JP		 3213 else if (prefix_route)
3214 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3215 break;
3216 case IN6_ADDR_GEN_MODE_NONE:
3217 default:
3218 /* will not add any link local address */
3219 break;
bc91b0f0
JP		 3220 }
3221}
3222
1da177e4
LT		 3223static void addrconf_dev_config(struct net_device *dev)
3224{
8e5e8f30 3225 struct inet6_dev *idev;
1da177e4
LT		 3226
3227 ASSERT_RTNL();
3228
74235a25
HX		 3229 if ((dev->type != ARPHRD_ETHER) &&
3230 (dev->type != ARPHRD_FDDI) &&
74235a25 3231 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3232 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3233 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3234 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc 3235 (dev->type != ARPHRD_6LOWPAN) &&
45ce0fd1
FJ		 3236 (dev->type != ARPHRD_IP6GRE) &&
3237 (dev->type != ARPHRD_IPGRE) &&
3238 (dev->type != ARPHRD_TUNNEL) &&
cc9da6cc 3239 (dev->type != ARPHRD_NONE)) {
74235a25
HX		 3240 /* Alas, we support only Ethernet autoconfiguration. */
3241 return;
3242 }
3243
1da177e4 3244 idev = addrconf_add_dev(dev);
64e724f6 3245 if (IS_ERR(idev))
1da177e4
LT		 3246 return;
3247
cc9da6cc
BM		 3248 /* this device type has no EUI support */
3249 if (dev->type == ARPHRD_NONE &&
d35a00b8
FJ		 3250 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3251 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc 3252
bc91b0f0 3253 addrconf_addr_gen(idev, false);
1da177e4
LT		 3254}
3255
07a93626 3256#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3257static void addrconf_sit_config(struct net_device *dev)
3258{
3259 struct inet6_dev *idev;
3260
3261 ASSERT_RTNL();
3262
1ab1457c
YH		 3263 /*
3264 * Configure the tunnel with one of our IPv4
3265 * addresses... we should configure all of
1da177e4
LT		 3266 * our v4 addrs in the tunnel
3267 */
3268
e5d08d71 3269 idev = ipv6_find_idev(dev);
63159f29 3270 if (!idev) {
91df42be 3271 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3272 return;
3273 }
3274
c7dc89c0 3275 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3276 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3277 return;
3278 }
3279
1da177e4
LT		 3280 sit_add_v4_addrs(idev);
3281
62b54dd9 3282 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3283 addrconf_add_mroute(dev);
1da177e4 3284}
0be669bb 3285#endif
1da177e4 3286
07a93626 3287#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3288static void addrconf_gre_config(struct net_device *dev)
3289{
3290 struct inet6_dev *idev;
aee80b54 3291
aee80b54 3292 ASSERT_RTNL();
3293
e5d08d71 3294 idev = ipv6_find_idev(dev);
63159f29 3295 if (!idev) {
91df42be 3296 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3297 return;
3298 }
3299
bc91b0f0 3300 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3301 if (dev->flags & IFF_POINTOPOINT)
3302 addrconf_add_mroute(dev);
aee80b54 3303}
3304#endif
3305
f1705ec1
DA		 3306static int fixup_permanent_addr(struct inet6_dev *idev,
3307 struct inet6_ifaddr *ifp)
3308{
8048ced9
DA		 3309 /* rt6i_ref == 0 means the host route was removed from the
3310 * FIB, for example, if 'lo' device is taken down. In that
3311 * case regenerate the host route.
3312 */
3313 if (!ifp->rt || !atomic_read(&ifp->rt->rt6i_ref)) {
3314 struct rt6_info *rt, *prev;
f1705ec1
DA		 3315
3316 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3317 if (unlikely(IS_ERR(rt)))
3318 return PTR_ERR(rt);
3319
8048ced9
DA		 3320 /* ifp->rt can be accessed outside of rtnl */
3321 spin_lock(&ifp->lock);
3322 prev = ifp->rt;
f1705ec1 3323 ifp->rt = rt;
8048ced9
DA		 3324 spin_unlock(&ifp->lock);
3325
3326 ip6_rt_put(prev);
f1705ec1
DA		 3327 }
3328
3329 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3330 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3331 idev->dev, 0, 0);
3332 }
3333
6d717134
DA		 3334 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3335 addrconf_dad_start(ifp);
f1705ec1
DA		 3336
3337 return 0;
3338}
3339
3340static void addrconf_permanent_addr(struct net_device *dev)
3341{
3342 struct inet6_ifaddr *ifp, *tmp;
3343 struct inet6_dev *idev;
3344
3345 idev = __in6_dev_get(dev);
3346 if (!idev)
3347 return;
3348
3349 write_lock_bh(&idev->lock);
3350
3351 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3352 if ((ifp->flags & IFA_F_PERMANENT) &&
3353 fixup_permanent_addr(idev, ifp) < 0) {
3354 write_unlock_bh(&idev->lock);
3355 ipv6_del_addr(ifp);
3356 write_lock_bh(&idev->lock);
3357
3358 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3359 idev->dev->name, &ifp->addr);
3360 }
3361 }
3362
3363 write_unlock_bh(&idev->lock);
3364}
3365
1ab1457c 3366static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3367 void *ptr)
1da177e4 3368{
351638e7 3369 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4f7f34ea 3370 struct netdev_notifier_changeupper_info *info;
748e2d93 3371 struct inet6_dev *idev = __in6_dev_get(dev);
60abc0be 3372 struct net *net = dev_net(dev);
c5e33bdd 3373 int run_pending = 0;
b217d616 3374 int err;
1da177e4 3375
e21e8467 3376 switch (event) {
45ba9dd2 3377 case NETDEV_REGISTER:
74235a25 3378 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3379 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3380 if (IS_ERR(idev))
3381 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3382 }
3383 break;
bcdd553f 3384
b7b0b1d2
AD		 3385 case NETDEV_CHANGEMTU:
3386 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3387 if (dev->mtu < IPV6_MIN_MTU) {
60abc0be 3388 addrconf_ifdown(dev, dev != net->loopback_dev);
b7b0b1d2
AD		 3389 break;
3390 }
3391
3392 if (idev) {
3393 rt6_mtu_change(dev, dev->mtu);
3394 idev->cnf.mtu6 = dev->mtu;
3395 break;
3396 }
3397
3398 /* allocate new idev */
3399 idev = ipv6_add_dev(dev);
3400 if (IS_ERR(idev))
3401 break;
3402
3403 /* device is still not ready */
3404 if (!(idev->if_flags & IF_READY))
3405 break;
3406
3407 run_pending = 1;
3408
3409 /* fall through */
3410
1da177e4 3411 case NETDEV_UP:
3c21edbd 3412 case NETDEV_CHANGE:
c2edacf8
JV		 3413 if (dev->flags & IFF_SLAVE)
3414 break;
3415
3ce62a84
WC		 3416 if (idev && idev->cnf.disable_ipv6)
3417 break;
3418
3c21edbd 3419 if (event == NETDEV_UP) {
38bd10c4
DA		 3420 /* restore routes for permanent addresses */
3421 addrconf_permanent_addr(dev);
3422
f24e3d65 3423 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 3424 /* device is not ready yet. */
f3213831 3425 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3426 dev->name);
3427 break;
3428 }
99081049 3429
d31c7b8f
EP		 3430 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3431 idev = ipv6_add_dev(dev);
3432
a317a2f1 3433 if (!IS_ERR_OR_NULL(idev)) {
99081049 3434 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3435 run_pending = 1;
3436 }
b7b0b1d2 3437 } else if (event == NETDEV_CHANGE) {
f24e3d65 3438 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 3439 /* device is still not ready. */
3440 break;
3441 }
3442
3443 if (idev) {
a088d1d7
LL		 3444 if (idev->if_flags & IF_READY) {
3445 /* device is already configured -
3446 * but resend MLD reports, we might
3447 * have roamed and need to update
3448 * multicast snooping switches
3449 */
3450 ipv6_mc_up(idev);
3c21edbd 3451 break;
a088d1d7 3452 }
3c21edbd
YH		 3453 idev->if_flags |= IF_READY;
3454 }
3455
f3213831
JP		 3456 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3457 dev->name);
3c21edbd 3458
c5e33bdd 3459 run_pending = 1;
3c21edbd
YH		 3460 }
3461
e21e8467 3462 switch (dev->type) {
07a93626 3463#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3464 case ARPHRD_SIT:
3465 addrconf_sit_config(dev);
3466 break;
aee80b54 3467#endif
07a93626 3468#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3469 case ARPHRD_IPGRE:
3470 addrconf_gre_config(dev);
3471 break;
0be669bb 3472#endif
1da177e4
LT		 3473 case ARPHRD_LOOPBACK:
3474 init_loopback(dev);
3475 break;
3476
3477 default:
3478 addrconf_dev_config(dev);
3479 break;
3ff50b79 3480 }
bcdd553f 3481
a317a2f1 3482 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3483 if (run_pending)
3484 addrconf_dad_run(idev);
3485
bcdd553f
SH		 3486 /*
3487 * If the MTU changed during the interface down,
3488 * when the interface up, the changed MTU must be
3489 * reflected in the idev as well as routers.
1da177e4 3490 */
bcdd553f
SH		 3491 if (idev->cnf.mtu6 != dev->mtu &&
3492 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3493 rt6_mtu_change(dev, dev->mtu);
3494 idev->cnf.mtu6 = dev->mtu;
3495 }
3496 idev->tstamp = jiffies;
3497 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3498
3499 /*
3500 * If the changed mtu during down is lower than
3501 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3502 */
3503 if (dev->mtu < IPV6_MIN_MTU)
60abc0be 3504 addrconf_ifdown(dev, dev != net->loopback_dev);
1da177e4
LT		 3505 }
3506 break;
3507
1da177e4
LT		 3508 case NETDEV_DOWN:
3509 case NETDEV_UNREGISTER:
3510 /*
3511 * Remove all addresses from this interface.
3512 */
3513 addrconf_ifdown(dev, event != NETDEV_DOWN);
3514 break;
3c21edbd 3515
1da177e4 3516 case NETDEV_CHANGENAME:
1da177e4 3517 if (idev) {
5632c515 3518 snmp6_unregister_dev(idev);
408c4768 3519 addrconf_sysctl_unregister(idev);
a317a2f1 3520 err = addrconf_sysctl_register(idev);
b217d616
HX		 3521 if (err)
3522 return notifier_from_errno(err);
a317a2f1
WC		 3523 err = snmp6_register_dev(idev);
3524 if (err) {
3525 addrconf_sysctl_unregister(idev);
3526 return notifier_from_errno(err);
3527 }
5632c515 3528 }
1da177e4 3529 break;
bcdd553f 3530
93d9b7d7
JP		 3531 case NETDEV_PRE_TYPE_CHANGE:
3532 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3533 if (idev)
3534 addrconf_type_change(dev, event);
75c78500 3535 break;
4f7f34ea
DA		 3536
3537 case NETDEV_CHANGEUPPER:
3538 info = ptr;
3539
3540 /* flush all routes if dev is linked to or unlinked from
3541 * an L3 master device (e.g., VRF)
3542 */
3543 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3544 addrconf_ifdown(dev, 0);
3ff50b79 3545 }
1da177e4
LT		 3546
3547 return NOTIFY_OK;
3548}
3549
3550/*
3551 * addrconf module should be notified of a device going up
3552 */
3553static struct notifier_block ipv6_dev_notf = {
3554 .notifier_call = addrconf_notify,
242d3a49 3555 .priority = ADDRCONF_NOTIFY_PRIORITY,
1da177e4
LT		 3556};
3557
93d9b7d7 3558static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3559{
3560 struct inet6_dev *idev;
3561 ASSERT_RTNL();
3562
3563 idev = __in6_dev_get(dev);
3564
93d9b7d7 3565 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3566 ipv6_mc_remap(idev);
93d9b7d7 3567 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3568 ipv6_mc_unmap(idev);
3569}
3570
70af921d
DA		 3571static bool addr_is_local(const struct in6_addr *addr)
3572{
3573 return ipv6_addr_type(addr) &
3574 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3575}
3576
1da177e4
LT		 3577static int addrconf_ifdown(struct net_device *dev, int how)
3578{
c346dca1 3579 struct net *net = dev_net(dev);
502a2ffd 3580 struct inet6_dev *idev;
f1705ec1
DA		 3581 struct inet6_ifaddr *ifa, *tmp;
3582 struct list_head del_list;
3583 int _keep_addr;
3584 bool keep_addr;
73a8bd74 3585 int state, i;
1da177e4
LT		 3586
3587 ASSERT_RTNL();
3588
73a8bd74
DM		 3589 rt6_ifdown(net, dev);
3590 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3591
3592 idev = __in6_dev_get(dev);
63159f29 3593 if (!idev)
1da177e4
LT		 3594 return -ENODEV;
3595
bcdd553f
SH		 3596 /*
3597 * Step 1: remove reference to ipv6 device from parent device.
3598 * Do not dev_put!
1da177e4 3599 */
439e2385 3600 if (how) {
1da177e4 3601 idev->dead = 1;
8814c4b5
YH		 3602
3603 /* protected by rtnl_lock */
a9b3cd7f 3604 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3605
3606 /* Step 1.5: remove snmp6 entry */
3607 snmp6_unregister_dev(idev);
3608
3609 }
3610
f1705ec1
DA		 3611 /* aggregate the system setting and interface setting */
3612 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3613 if (!_keep_addr)
3614 _keep_addr = idev->cnf.keep_addr_on_down;
3615
3616 /* combine the user config with event to determine if permanent
3617 * addresses are to be removed from address hash table
3618 */
bc561632 3619 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
f1705ec1 3620
73a8bd74
DM		 3621 /* Step 2: clear hash table */
3622 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3623 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3624
3625 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3626restart:
b67bfe0d 3627 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3628 if (ifa->idev == idev) {
c15b1cca 3629 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3630 /* combined flag + permanent flag decide if
3631 * address is retained on a down event
3632 */
3633 if (!keep_addr ||
70af921d
DA		 3634 !(ifa->flags & IFA_F_PERMANENT) ||
3635 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3636 hlist_del_init_rcu(&ifa->addr_lst);
3637 goto restart;
3638 }
73a8bd74
DM		 3639 }
3640 }
3641 spin_unlock_bh(&addrconf_hash_lock);
3642 }
3643
1da177e4
LT		 3644 write_lock_bh(&idev->lock);
3645
b7b1bfce
HFS		 3646 addrconf_del_rs_timer(idev);
3647
bcdd553f 3648 /* Step 2: clear flags for stateless addrconf */
439e2385 3649 if (!how)
3c21edbd 3650 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3651
bcdd553f 3652 /* Step 3: clear tempaddr list */
372e6c8f 3653 while (!list_empty(&idev->tempaddr_list)) {
3654 ifa = list_first_entry(&idev->tempaddr_list,
3655 struct inet6_ifaddr, tmp_list);
3656 list_del(&ifa->tmp_list);
1da177e4
LT		 3657 write_unlock_bh(&idev->lock);
3658 spin_lock_bh(&ifa->lock);
3659
3660 if (ifa->ifpub) {
3661 in6_ifa_put(ifa->ifpub);
3662 ifa->ifpub = NULL;
3663 }
3664 spin_unlock_bh(&ifa->lock);
3665 in6_ifa_put(ifa);
3666 write_lock_bh(&idev->lock);
3667 }
8f37ada5 3668
f1705ec1
DA		 3669 /* re-combine the user config with event to determine if permanent
3670 * addresses are to be removed from the interface list
3671 */
bc561632 3672 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
84e8b803 3673
f1705ec1
DA		 3674 INIT_LIST_HEAD(&del_list);
3675 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
38bd10c4 3676 struct rt6_info *rt = NULL;
a2d6cbb0 3677 bool keep;
38bd10c4 3678
f1705ec1 3679 addrconf_del_dad_work(ifa);
84e8b803 3680
a2d6cbb0
RV		 3681 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3682 !addr_is_local(&ifa->addr);
3683 if (!keep)
3684 list_move(&ifa->if_list, &del_list);
3685
73a8bd74 3686 write_unlock_bh(&idev->lock);
8e8e676d 3687 spin_lock_bh(&ifa->lock);
f1705ec1 3688
a2d6cbb0 3689 if (keep) {
f1705ec1
DA		 3690 /* set state to skip the notifier below */
3691 state = INET6_IFADDR_STATE_DEAD;
6d717134 3692 ifa->state = INET6_IFADDR_STATE_PREDAD;
f1705ec1
DA		 3693 if (!(ifa->flags & IFA_F_NODAD))
3694 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3695
3696 rt = ifa->rt;
3697 ifa->rt = NULL;
f1705ec1
DA		 3698 } else {
3699 state = ifa->state;
3700 ifa->state = INET6_IFADDR_STATE_DEAD;
f1705ec1
DA		 3701 }
3702
8e8e676d 3703 spin_unlock_bh(&ifa->lock);
9d82ca98 3704
38bd10c4
DA		 3705 if (rt)
3706 ip6_del_rt(rt);
3707
73a8bd74
DM		 3708 if (state != INET6_IFADDR_STATE_DEAD) {
3709 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3710 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
ea06f717
MM		 3711 } else {
3712 if (idev->cnf.forwarding)
3713 addrconf_leave_anycast(ifa);
3714 addrconf_leave_solict(ifa->idev, &ifa->addr);
27bdb2ab 3715 }
8f37ada5 3716
73a8bd74
DM		 3717 write_lock_bh(&idev->lock);
3718 }
8f37ada5 3719
1da177e4
LT		 3720 write_unlock_bh(&idev->lock);
3721
f1705ec1
DA		 3722 /* now clean up addresses to be removed */
3723 while (!list_empty(&del_list)) {
3724 ifa = list_first_entry(&del_list,
3725 struct inet6_ifaddr, if_list);
3726 list_del(&ifa->if_list);
3727
3728 in6_ifa_put(ifa);
3729 }
3730
381f4dca
SD		 3731 /* Step 5: Discard anycast and multicast list */
3732 if (how) {
3733 ipv6_ac_destroy_dev(idev);
1da177e4 3734 ipv6_mc_destroy_dev(idev);
381f4dca 3735 } else {
1da177e4 3736 ipv6_mc_down(idev);
381f4dca 3737 }
1da177e4 3738
1da177e4 3739 idev->tstamp = jiffies;
1ab1457c 3740
bcdd553f 3741 /* Last: Shot the device (if unregistered) */
439e2385 3742 if (how) {
408c4768 3743 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3744 neigh_parms_release(&nd_tbl, idev->nd_parms);
3745 neigh_ifdown(&nd_tbl, dev);
3746 in6_dev_put(idev);
3747 }
3748 return 0;
3749}
3750
3751static void addrconf_rs_timer(unsigned long data)
3752{
b7b1bfce 3753 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3754 struct net_device *dev = idev->dev;
b7b1bfce 3755 struct in6_addr lladdr;
1da177e4 3756
b7b1bfce 3757 write_lock(&idev->lock);
5b2a1953 3758 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3759 goto out;
3760
9ba2add3 3761 if (!ipv6_accept_ra(idev))
5b2a1953 3762 goto out;
3763
3764 /* Announcement received after solicitation was sent */
3765 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3766 goto out;
1da177e4 3767
bd11f074 3768 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
caf92bc4
CW		 3769 write_unlock(&idev->lock);
3770 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3771 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3772 &in6addr_linklocal_allrouters);
3773 else
caf92bc4 3774 goto put;
1da177e4 3775
caf92bc4 3776 write_lock(&idev->lock);
bd11f074
MŻ		 3777 idev->rs_interval = rfc3315_s14_backoff_update(
3778 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
b7b1bfce
HFS		 3779 /* The wait after the last probe can be shorter */
3780 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3781 idev->cnf.rtr_solicits) ?
3782 idev->cnf.rtr_solicit_delay :
bd11f074 3783 idev->rs_interval);
1da177e4 3784 } else {
1da177e4
LT		 3785 /*
3786 * Note: we do not support deprecated "all on-link"
3787 * assumption any longer.
3788 */
91df42be 3789 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3790 }
3791
3792out:
b7b1bfce 3793 write_unlock(&idev->lock);
caf92bc4 3794put:
b7b1bfce 3795 in6_dev_put(idev);
1da177e4
LT		 3796}
3797
3798/*
3799 * Duplicate Address Detection
3800 */
3c21edbd
YH		 3801static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3802{
3803 unsigned long rand_num;
3804 struct inet6_dev *idev = ifp->idev;
adc176c5 3805 u64 nonce;
3c21edbd 3806
95c385b4
NH		 3807 if (ifp->flags & IFA_F_OPTIMISTIC)
3808 rand_num = 0;
3809 else
63862b5b 3810 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3811
adc176c5
EN		 3812 nonce = 0;
3813 if (idev->cnf.enhanced_dad ||
3814 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3815 do
3816 get_random_bytes(&nonce, 6);
3817 while (nonce == 0);
3818 }
3819 ifp->dad_nonce = nonce;
b7b1bfce 3820 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3821 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3822}
3823
c15b1cca 3824static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3825{
3826 struct inet6_dev *idev = ifp->idev;
3827 struct net_device *dev = idev->dev;
764d3be6 3828 bool bump_id, notify = false;
1da177e4
LT		 3829
3830 addrconf_join_solict(dev, &ifp->addr);
3831
63862b5b 3832 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3833
3834 read_lock_bh(&idev->lock);
622ccdf1 3835 spin_lock(&ifp->lock);
e9d3e084 3836 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3837 goto out;
1da177e4
LT		 3838
3839 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3840 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3841 !(ifp->flags&IFA_F_TENTATIVE) ||
3842 ifp->flags & IFA_F_NODAD) {
764d3be6 3843 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3844 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3845 spin_unlock(&ifp->lock);
1da177e4
LT		 3846 read_unlock_bh(&idev->lock);
3847
764d3be6 3848 addrconf_dad_completed(ifp, bump_id);
1da177e4
LT		 3849 return;
3850 }
3851
6732bade 3852 if (!(idev->if_flags & IF_READY)) {
21809faf 3853 spin_unlock(&ifp->lock);
6732bade 3854 read_unlock_bh(&idev->lock);
3c21edbd 3855 /*
590a9887 3856 * If the device is not ready:
3c21edbd
YH		 3857 * - keep it tentative if it is a permanent address.
3858 * - otherwise, kill it.
3859 */
3860 in6_ifa_hold(ifp);
cc411d0b 3861 addrconf_dad_stop(ifp, 0);
6732bade 3862 return;
3c21edbd 3863 }
95c385b4
NH		 3864
3865 /*
3866 * Optimistic nodes can start receiving
3867 * Frames right away
3868 */
7fd2561e 3869 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3870 ip6_ins_rt(ifp->rt);
7fd2561e
EK		 3871 if (ipv6_use_optimistic_addr(idev)) {
3872 /* Because optimistic nodes can use this address,
3873 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3874 */
16186a82 3875 notify = true;
7fd2561e
EK		 3876 }
3877 }
95c385b4 3878
6732bade 3879 addrconf_dad_kick(ifp);
1da177e4 3880out:
622ccdf1 3881 spin_unlock(&ifp->lock);
1da177e4 3882 read_unlock_bh(&idev->lock);
16186a82
SAK		 3883 if (notify)
3884 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 3885}
3886
c15b1cca 3887static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3888{
c15b1cca
HFS		 3889 bool begin_dad = false;
3890
8e8e676d 3891 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3892 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3893 ifp->state = INET6_IFADDR_STATE_PREDAD;
3894 begin_dad = true;
3895 }
8e8e676d 3896 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3897
3898 if (begin_dad)
3899 addrconf_mod_dad_work(ifp, 0);
3900}
3901
3902static void addrconf_dad_work(struct work_struct *w)
3903{
3904 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3905 struct inet6_ifaddr,
3906 dad_work);
1da177e4 3907 struct inet6_dev *idev = ifp->idev;
764d3be6 3908 bool bump_id, disable_ipv6 = false;
1da177e4
LT		 3909 struct in6_addr mcaddr;
3910
c15b1cca
HFS		 3911 enum {
3912 DAD_PROCESS,
3913 DAD_BEGIN,
3914 DAD_ABORT,
3915 } action = DAD_PROCESS;
3916
3917 rtnl_lock();
3918
8e8e676d 3919 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3920 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3921 action = DAD_BEGIN;
3922 ifp->state = INET6_IFADDR_STATE_DAD;
3923 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3924 action = DAD_ABORT;
3925 ifp->state = INET6_IFADDR_STATE_POSTDAD;
85b51b12
MM		 3926
3927 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3928 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3929 struct in6_addr addr;
3930
3931 addr.s6_addr32[0] = htonl(0xfe800000);
3932 addr.s6_addr32[1] = 0;
3933
3934 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3935 ipv6_addr_equal(&ifp->addr, &addr)) {
3936 /* DAD failed for link-local based on MAC */
3937 idev->cnf.disable_ipv6 = 1;
3938
3939 pr_info("%s: IPv6 being disabled!\n",
3940 ifp->idev->dev->name);
3941 disable_ipv6 = true;
3942 }
3943 }
c15b1cca 3944 }
8e8e676d 3945 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3946
3947 if (action == DAD_BEGIN) {
3948 addrconf_dad_begin(ifp);
3949 goto out;
3950 } else if (action == DAD_ABORT) {
751eb6b6 3951 in6_ifa_hold(ifp);
c15b1cca 3952 addrconf_dad_stop(ifp, 1);
85b51b12
MM		 3953 if (disable_ipv6)
3954 addrconf_ifdown(idev->dev, 0);
c15b1cca
HFS		 3955 goto out;
3956 }
3957
b7b1bfce 3958 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3959 goto out;
3960
c15b1cca 3961 write_lock_bh(&idev->lock);
122e4519 3962 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3963 write_unlock_bh(&idev->lock);
1da177e4
LT		 3964 goto out;
3965 }
21809faf 3966
3967 spin_lock(&ifp->lock);
622ccdf1
HX		 3968 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3969 spin_unlock(&ifp->lock);
c15b1cca 3970 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3971 goto out;
3972 }
3973
b7b1bfce 3974 if (ifp->dad_probes == 0) {
1da177e4
LT		 3975 /*
3976 * DAD was successful
3977 */
3978
764d3be6 3979 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3980 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3981 spin_unlock(&ifp->lock);
c15b1cca 3982 write_unlock_bh(&idev->lock);
1da177e4 3983
764d3be6 3984 addrconf_dad_completed(ifp, bump_id);
1da177e4
LT		 3985
3986 goto out;
3987 }
3988
b7b1bfce 3989 ifp->dad_probes--;
c15b1cca
HFS		 3990 addrconf_mod_dad_work(ifp,
3991 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3992 spin_unlock(&ifp->lock);
c15b1cca 3993 write_unlock_bh(&idev->lock);
1da177e4
LT		 3994
3995 /* send a neighbour solicitation for our addr */
1da177e4 3996 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
adc176c5
EN		 3997 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
3998 ifp->dad_nonce);
1da177e4
LT		 3999out:
4000 in6_ifa_put(ifp);
c15b1cca 4001 rtnl_unlock();
1da177e4
LT		 4002}
4003
11ffff75
HFS		 4004/* ifp->idev must be at least read locked */
4005static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4006{
4007 struct inet6_ifaddr *ifpiter;
4008 struct inet6_dev *idev = ifp->idev;
4009
602582ca
HFS		 4010 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4011 if (ifpiter->scope > IFA_LINK)
4012 break;
11ffff75
HFS		 4013 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4014 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4015 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4016 IFA_F_PERMANENT)
4017 return false;
4018 }
4019 return true;
4020}
4021
764d3be6 4022static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id)
1da177e4 4023{
e21e8467 4024 struct net_device *dev = ifp->idev->dev;
b7b1bfce 4025 struct in6_addr lladdr;
b173ee48 4026 bool send_rs, send_mld;
b7b1bfce 4027
c15b1cca 4028 addrconf_del_dad_work(ifp);
1da177e4
LT		 4029
4030 /*
4031 * Configure the address for reception. Now it is valid.
4032 */
4033
4034 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4035
026359bc
TA		 4036 /* If added prefix is link local and we are prepared to process
4037 router advertisements, start sending router solicitations.
1da177e4
LT		 4038 */
4039
1ec047eb 4040 read_lock_bh(&ifp->idev->lock);
11ffff75 4041 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 4042 send_rs = send_mld &&
4043 ipv6_accept_ra(ifp->idev) &&
bd11f074 4044 ifp->idev->cnf.rtr_solicits != 0 &&
b173ee48 4045 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 4046 read_unlock_bh(&ifp->idev->lock);
4047
b173ee48
HFS		 4048 /* While dad is in progress mld report's source address is in6_addrany.
4049 * Resend with proper ll now.
4050 */
4051 if (send_mld)
4052 ipv6_mc_dad_complete(ifp->idev);
4053
1ec047eb 4054 if (send_rs) {
1da177e4
LT		 4055 /*
4056 * If a host as already performed a random delay
4057 * [...] as part of DAD [...] there is no need
4058 * to delay again before sending the first RS
4059 */
1ec047eb 4060 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 4061 return;
1ec047eb 4062 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 4063
b7b1bfce
HFS		 4064 write_lock_bh(&ifp->idev->lock);
4065 spin_lock(&ifp->lock);
bd11f074
MŻ		 4066 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4067 ifp->idev->cnf.rtr_solicit_interval);
b7b1bfce 4068 ifp->idev->rs_probes = 1;
1da177e4 4069 ifp->idev->if_flags |= IF_RS_SENT;
bd11f074 4070 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
b7b1bfce
HFS		 4071 spin_unlock(&ifp->lock);
4072 write_unlock_bh(&ifp->idev->lock);
1da177e4 4073 }
764d3be6
PA		 4074
4075 if (bump_id)
4076 rt_genid_bump_ipv6(dev_net(dev));
a11a7f71
MH		 4077
4078 /* Make sure that a new temporary address will be created
4079 * before this temporary address becomes deprecated.
4080 */
4081 if (ifp->flags & IFA_F_TEMPORARY)
4082 addrconf_verify_rtnl();
1da177e4
LT		 4083}
4084
e21e8467
SH		 4085static void addrconf_dad_run(struct inet6_dev *idev)
4086{
c5e33bdd
YH		 4087 struct inet6_ifaddr *ifp;
4088
4089 read_lock_bh(&idev->lock);
502a2ffd 4090 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 4091 spin_lock(&ifp->lock);
f2344a13
HX		 4092 if (ifp->flags & IFA_F_TENTATIVE &&
4093 ifp->state == INET6_IFADDR_STATE_DAD)
4094 addrconf_dad_kick(ifp);
21809faf 4095 spin_unlock(&ifp->lock);
c5e33bdd
YH		 4096 }
4097 read_unlock_bh(&idev->lock);
4098}
4099
1da177e4
LT		 4100#ifdef CONFIG_PROC_FS
4101struct if6_iter_state {
3c40090a 4102 struct seq_net_private p;
1da177e4 4103 int bucket;
1d578303 4104 int offset;
1da177e4
LT		 4105};
4106
1d578303 4107static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 4108{
4109 struct inet6_ifaddr *ifa = NULL;
4110 struct if6_iter_state *state = seq->private;
1218854a 4111 struct net *net = seq_file_net(seq);
1d578303 4112 int p = 0;
1da177e4 4113
1d578303
MM		 4114 /* initial bucket if pos is 0 */
4115 if (pos == 0) {
4116 state->bucket = 0;
4117 state->offset = 0;
4118 }
4119
4120 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 4121 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 4122 addr_lst) {
9f0d3c27
ED		 4123 if (!net_eq(dev_net(ifa->idev->dev), net))
4124 continue;
1d578303
MM		 4125 /* sync with offset */
4126 if (p < state->offset) {
4127 p++;
4128 continue;
4129 }
4130 state->offset++;
9f0d3c27 4131 return ifa;
1d578303
MM		 4132 }
4133
4134 /* prepare for next bucket */
4135 state->offset = 0;
4136 p = 0;
1da177e4 4137 }
c2e21293 4138 return NULL;
1da177e4
LT		 4139}
4140
c2e21293 4141static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4142 struct inet6_ifaddr *ifa)
1da177e4
LT		 4143{
4144 struct if6_iter_state *state = seq->private;
1218854a 4145 struct net *net = seq_file_net(seq);
1da177e4 4146
b67bfe0d 4147 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 4148 if (!net_eq(dev_net(ifa->idev->dev), net))
4149 continue;
1d578303 4150 state->offset++;
9f0d3c27 4151 return ifa;
1d578303 4152 }
3c40090a 4153
c2e21293 4154 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 4155 state->offset = 0;
b67bfe0d 4156 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 4157 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 4158 if (!net_eq(dev_net(ifa->idev->dev), net))
4159 continue;
1d578303 4160 state->offset++;
9f0d3c27 4161 return ifa;
c2e21293 4162 }
1da177e4 4163 }
3c40090a 4164
c2e21293 4165 return NULL;
1da177e4
LT		 4166}
4167
1da177e4 4168static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 4169 __acquires(rcu_bh)
1da177e4 4170{
5c578aed 4171 rcu_read_lock_bh();
1d578303 4172 return if6_get_first(seq, *pos);
1da177e4
LT		 4173}
4174
4175static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4176{
4177 struct inet6_ifaddr *ifa;
4178
4179 ifa = if6_get_next(seq, v);
4180 ++*pos;
4181 return ifa;
4182}
4183
4184static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 4185 __releases(rcu_bh)
1da177e4 4186{
5c578aed 4187 rcu_read_unlock_bh();
1da177e4
LT		 4188}
4189
4190static int if6_seq_show(struct seq_file *seq, void *v)
4191{
4192 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4193 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4194 &ifp->addr,
1da177e4
LT		 4195 ifp->idev->dev->ifindex,
4196 ifp->prefix_len,
4197 ifp->scope,
971a351c 4198 (u8) ifp->flags,
1da177e4
LT		 4199 ifp->idev->dev->name);
4200 return 0;
4201}
4202
56b3d975 4203static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4204 .start = if6_seq_start,
4205 .next = if6_seq_next,
4206 .show = if6_seq_show,
4207 .stop = if6_seq_stop,
4208};
4209
4210static int if6_seq_open(struct inode *inode, struct file *file)
4211{
3c40090a
DL		 4212 return seq_open_net(inode, file, &if6_seq_ops,
4213 sizeof(struct if6_iter_state));
1da177e4
LT		 4214}
4215
9a32144e 4216static const struct file_operations if6_fops = {
1da177e4
LT		 4217 .owner = THIS_MODULE,
4218 .open = if6_seq_open,
4219 .read = seq_read,
4220 .llseek = seq_lseek,
3c40090a 4221 .release = seq_release_net,
1da177e4
LT		 4222};
4223
2c8c1e72 4224static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4225{
d4beaa66 4226 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 4227 return -ENOMEM;
4228 return 0;
4229}
4230
2c8c1e72 4231static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4232{
ece31ffd 4233 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4234}
4235
4236static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4237 .init = if6_proc_net_init,
4238 .exit = if6_proc_net_exit,
3c40090a
DL		 4239};
4240
4241int __init if6_proc_init(void)
4242{
4243 return register_pernet_subsys(&if6_proc_net_ops);
4244}
4245
1da177e4
LT		 4246void if6_proc_exit(void)
4247{
3c40090a 4248 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4249}
4250#endif /* CONFIG_PROC_FS */
4251
07a93626 4252#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4253/* Check if address is a home address configured on any interface. */
b71d1d42 4254int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 4255{
4256 int ret = 0;
c2e21293 4257 struct inet6_ifaddr *ifp = NULL;
ddbe5032 4258 unsigned int hash = inet6_addr_hash(addr);
c2e21293 4259
5c578aed 4260 rcu_read_lock_bh();
b67bfe0d 4261 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 4262 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 4263 continue;
caad295f 4264 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4265 (ifp->flags & IFA_F_HOMEADDRESS)) {
4266 ret = 1;
4267 break;
4268 }
4269 }
5c578aed 4270 rcu_read_unlock_bh();
3b9f9a1c
NT		 4271 return ret;
4272}
4273#endif
4274
1da177e4
LT		 4275/*
4276 * Periodic address status verification
4277 */
4278
c15b1cca 4279static void addrconf_verify_rtnl(void)
1da177e4 4280{
b2db7564 4281 unsigned long now, next, next_sec, next_sched;
1da177e4 4282 struct inet6_ifaddr *ifp;
1da177e4
LT		 4283 int i;
4284
c15b1cca
HFS		 4285 ASSERT_RTNL();
4286
5c578aed 4287 rcu_read_lock_bh();
1da177e4 4288 now = jiffies;
b2db7564 4289 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4290
c15b1cca 4291 cancel_delayed_work(&addr_chk_work);
1da177e4 4292
bcdd553f 4293 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4294restart:
c15b1cca 4295 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 4296 unsigned long age;
1da177e4 4297
fad8da3e
YA		 4298 /* When setting preferred_lft to a value not zero or
4299 * infinity, while valid_lft is infinity
4300 * IFA_F_PERMANENT has a non-infinity life time.
4301 */
4302 if ((ifp->flags & IFA_F_PERMANENT) &&
4303 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4304 continue;
4305
4306 spin_lock(&ifp->lock);
b2db7564
YH		 4307 /* We try to batch several events at once. */
4308 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4309
8f27ebb9
YH		 4310 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4311 age >= ifp->valid_lft) {
1da177e4
LT		 4312 spin_unlock(&ifp->lock);
4313 in6_ifa_hold(ifp);
1da177e4
LT		 4314 ipv6_del_addr(ifp);
4315 goto restart;
8f27ebb9
YH		 4316 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4317 spin_unlock(&ifp->lock);
4318 continue;
1da177e4 4319 } else if (age >= ifp->prefered_lft) {
a1ed0526 4320 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4321 int deprecate = 0;
4322
4323 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4324 deprecate = 1;
4325 ifp->flags |= IFA_F_DEPRECATED;
4326 }
4327
fad8da3e
YA		 4328 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4329 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4330 next = ifp->tstamp + ifp->valid_lft * HZ;
4331
4332 spin_unlock(&ifp->lock);
4333
4334 if (deprecate) {
4335 in6_ifa_hold(ifp);
1da177e4
LT		 4336
4337 ipv6_ifa_notify(0, ifp);
4338 in6_ifa_put(ifp);
4339 goto restart;
4340 }
1da177e4
LT		 4341 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4342 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4343 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4344 ifp->idev->cnf.dad_transmits *
1f9248e5 4345 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 4346
1da177e4
LT		 4347 if (age >= ifp->prefered_lft - regen_advance) {
4348 struct inet6_ifaddr *ifpub = ifp->ifpub;
4349 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4350 next = ifp->tstamp + ifp->prefered_lft * HZ;
4351 if (!ifp->regen_count && ifpub) {
4352 ifp->regen_count++;
4353 in6_ifa_hold(ifp);
4354 in6_ifa_hold(ifpub);
4355 spin_unlock(&ifp->lock);
5c578aed 4356
291d809b
HY		 4357 spin_lock(&ifpub->lock);
4358 ifpub->regen_count = 0;
4359 spin_unlock(&ifpub->lock);
1da177e4
LT		 4360 ipv6_create_tempaddr(ifpub, ifp);
4361 in6_ifa_put(ifpub);
4362 in6_ifa_put(ifp);
4363 goto restart;
4364 }
4365 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4366 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4367 spin_unlock(&ifp->lock);
1da177e4
LT		 4368 } else {
4369 /* ifp->prefered_lft <= ifp->valid_lft */
4370 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4371 next = ifp->tstamp + ifp->prefered_lft * HZ;
4372 spin_unlock(&ifp->lock);
4373 }
4374 }
1da177e4
LT		 4375 }
4376
b2db7564
YH		 4377 next_sec = round_jiffies_up(next);
4378 next_sched = next;
4379
4380 /* If rounded timeout is accurate enough, accept it. */
4381 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4382 next_sched = next_sec;
4383
4384 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4385 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4386 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4387
ba3542e1 4388 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4389 now, next, next_sec, next_sched);
c15b1cca 4390 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4391 rcu_read_unlock_bh();
1da177e4
LT		 4392}
4393
c15b1cca
HFS		 4394static void addrconf_verify_work(struct work_struct *w)
4395{
4396 rtnl_lock();
4397 addrconf_verify_rtnl();
4398 rtnl_unlock();
4399}
4400
4401static void addrconf_verify(void)
4402{
4403 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4404}
4405
caeaba79
ND		 4406static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4407 struct in6_addr **peer_pfx)
461d8837
TG		 4408{
4409 struct in6_addr *pfx = NULL;
4410
caeaba79
ND		 4411 *peer_pfx = NULL;
4412
461d8837
TG		 4413 if (addr)
4414 pfx = nla_data(addr);
4415
4416 if (local) {
4417 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4418 *peer_pfx = pfx;
4419 pfx = nla_data(local);
461d8837
TG		 4420 }
4421
4422 return pfx;
4423}
4424
ef7c79ed 4425static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4426 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4427 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4428 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4429 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 4430};
4431
1da177e4 4432static int
c21ef3e3
DA		 4433inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4434 struct netlink_ext_ack *extack)
1da177e4 4435{
3b1e0a65 4436 struct net *net = sock_net(skb->sk);
b933f716
TG		 4437 struct ifaddrmsg *ifm;
4438 struct nlattr *tb[IFA_MAX+1];
caeaba79 4439 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4440 u32 ifa_flags;
b933f716 4441 int err;
1da177e4 4442
fceb6435 4443 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4444 extack);
b933f716
TG		 4445 if (err < 0)
4446 return err;
4447
4448 ifm = nlmsg_data(nlh);
caeaba79 4449 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4450 if (!pfx)
1da177e4
LT		 4451 return -EINVAL;
4452
6046d5b4
HK		 4453 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4454
4455 /* We ignore other flags so far. */
4456 ifa_flags &= IFA_F_MANAGETEMPADDR;
4457
4458 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4459 ifm->ifa_prefixlen);
1da177e4
LT		 4460}
4461
479840ff 4462static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 4463 u32 prefered_lft, u32 valid_lft)
081bba5b 4464{
6f704992
YH		 4465 u32 flags;
4466 clock_t expires;
4bed72e4 4467 unsigned long timeout;
53bd6749 4468 bool was_managetempaddr;
5b84efec 4469 bool had_prefixroute;
46d48046 4470
c15b1cca
HFS		 4471 ASSERT_RTNL();
4472
081bba5b
NT		 4473 if (!valid_lft || (prefered_lft > valid_lft))
4474 return -EINVAL;
4475
53bd6749
JP		 4476 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4477 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4478 return -EINVAL;
4479
4bed72e4
YH		 4480 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4481 if (addrconf_finite_timeout(timeout)) {
4482 expires = jiffies_to_clock_t(timeout * HZ);
4483 valid_lft = timeout;
6f704992 4484 flags = RTF_EXPIRES;
4bed72e4
YH		 4485 } else {
4486 expires = 0;
4487 flags = 0;
4488 ifa_flags |= IFA_F_PERMANENT;
6f704992 4489 }
081bba5b 4490
4bed72e4
YH		 4491 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4492 if (addrconf_finite_timeout(timeout)) {
4493 if (timeout == 0)
4494 ifa_flags |= IFA_F_DEPRECATED;
4495 prefered_lft = timeout;
4496 }
081bba5b
NT		 4497
4498 spin_lock_bh(&ifp->lock);
53bd6749 4499 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4500 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4501 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4502 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4503 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4504 IFA_F_NOPREFIXROUTE);
53bd6749 4505 ifp->flags |= ifa_flags;
081bba5b
NT		 4506 ifp->tstamp = jiffies;
4507 ifp->valid_lft = valid_lft;
4508 ifp->prefered_lft = prefered_lft;
4509
4510 spin_unlock_bh(&ifp->lock);
4511 if (!(ifp->flags&IFA_F_TENTATIVE))
4512 ipv6_ifa_notify(0, ifp);
081bba5b 4513
761aac73
TH		 4514 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4515 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4516 expires, flags);
5b84efec
TH		 4517 } else if (had_prefixroute) {
4518 enum cleanup_prefix_rt_t action;
4519 unsigned long rt_expires;
4520
4521 write_lock_bh(&ifp->idev->lock);
4522 action = check_cleanup_prefix_route(ifp, &rt_expires);
4523 write_unlock_bh(&ifp->idev->lock);
4524
4525 if (action != CLEANUP_PREFIX_RT_NOP) {
4526 cleanup_prefix_route(ifp, rt_expires,
4527 action == CLEANUP_PREFIX_RT_DEL);
4528 }
761aac73 4529 }
53bd6749
JP		 4530
4531 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4532 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4533 valid_lft = prefered_lft = 0;
4534 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4535 !was_managetempaddr, jiffies);
4536 }
4537
c15b1cca 4538 addrconf_verify_rtnl();
081bba5b
NT		 4539
4540 return 0;
4541}
4542
1da177e4 4543static int
c21ef3e3
DA		 4544inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4545 struct netlink_ext_ack *extack)
1da177e4 4546{
3b1e0a65 4547 struct net *net = sock_net(skb->sk);
461d8837
TG		 4548 struct ifaddrmsg *ifm;
4549 struct nlattr *tb[IFA_MAX+1];
caeaba79 4550 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 4551 struct inet6_ifaddr *ifa;
4552 struct net_device *dev;
55ebaef1 4553 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 4554 u32 ifa_flags;
461d8837 4555 int err;
1da177e4 4556
fceb6435 4557 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4558 extack);
461d8837
TG		 4559 if (err < 0)
4560 return err;
4561
4562 ifm = nlmsg_data(nlh);
caeaba79 4563 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4564 if (!pfx)
1da177e4
LT		 4565 return -EINVAL;
4566
461d8837 4567 if (tb[IFA_CACHEINFO]) {
0778769d 4568 struct ifa_cacheinfo *ci;
461d8837
TG		 4569
4570 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 4571 valid_lft = ci->ifa_valid;
461d8837
TG		 4572 preferred_lft = ci->ifa_prefered;
4573 } else {
4574 preferred_lft = INFINITY_LIFE_TIME;
4575 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 4576 }
4577
af284937 4578 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4579 if (!dev)
7198f8ce
TG		 4580 return -ENODEV;
4581
479840ff
JP		 4582 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4583
55ebaef1 4584 /* We ignore other flags so far. */
761aac73 4585 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
93a714d6 4586 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
55ebaef1 4587
1cab3da6 4588 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
63159f29 4589 if (!ifa) {
7198f8ce
TG		 4590 /*
4591 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4592 * userspace already relies on not having to provide this.
7198f8ce 4593 */
caeaba79 4594 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 4595 ifm->ifa_prefixlen, ifa_flags,
4596 preferred_lft, valid_lft);
081bba5b
NT		 4597 }
4598
7198f8ce
TG		 4599 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4600 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4601 err = -EEXIST;
4602 else
55ebaef1 4603 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 4604
4605 in6_ifa_put(ifa);
4606
4607 return err;
1da177e4
LT		 4608}
4609
479840ff 4610static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4611 u8 scope, int ifindex)
4612{
4613 struct ifaddrmsg *ifm;
4614
4615 ifm = nlmsg_data(nlh);
4616 ifm->ifa_family = AF_INET6;
4617 ifm->ifa_prefixlen = prefixlen;
4618 ifm->ifa_flags = flags;
4619 ifm->ifa_scope = scope;
4620 ifm->ifa_index = ifindex;
4621}
4622
85486af0
TG		 4623static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4624 unsigned long tstamp, u32 preferred, u32 valid)
4625{
4626 struct ifa_cacheinfo ci;
4627
18a31e1e
TG		 4628 ci.cstamp = cstamp_delta(cstamp);
4629 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4630 ci.ifa_prefered = preferred;
4631 ci.ifa_valid = valid;
4632
4633 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4634}
4635
101bb229
TG		 4636static inline int rt_scope(int ifa_scope)
4637{
4638 if (ifa_scope & IFA_HOST)
4639 return RT_SCOPE_HOST;
4640 else if (ifa_scope & IFA_LINK)
4641 return RT_SCOPE_LINK;
4642 else if (ifa_scope & IFA_SITE)
4643 return RT_SCOPE_SITE;
4644 else
4645 return RT_SCOPE_UNIVERSE;
4646}
4647
0ab6803b
TG		 4648static inline int inet6_ifaddr_msgsize(void)
4649{
339bf98f 4650 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4651 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4652 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4653 + nla_total_size(sizeof(struct ifa_cacheinfo))
4654 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4655}
c5396a31 4656
1da177e4 4657static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4658 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4659{
1da177e4 4660 struct nlmsghdr *nlh;
85486af0 4661 u32 preferred, valid;
1da177e4 4662
15e47304 4663 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4664 if (!nlh)
26932566 4665 return -EMSGSIZE;
0ab6803b 4666
101bb229
TG		 4667 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4668 ifa->idev->dev->ifindex);
4669
fad8da3e
YA		 4670 if (!((ifa->flags&IFA_F_PERMANENT) &&
4671 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4672 preferred = ifa->prefered_lft;
4673 valid = ifa->valid_lft;
4674 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4675 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4676 if (preferred > tval)
4677 preferred -= tval;
4678 else
4679 preferred = 0;
f56619fc
BH		 4680 if (valid != INFINITY_LIFE_TIME) {
4681 if (valid > tval)
4682 valid -= tval;
4683 else
4684 valid = 0;
4685 }
1da177e4
LT		 4686 }
4687 } else {
85486af0
TG		 4688 preferred = INFINITY_LIFE_TIME;
4689 valid = INFINITY_LIFE_TIME;
4690 }
4691
7996c799 4692 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4693 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4694 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4695 goto error;
4696 } else
930345ea 4697 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4698 goto error;
4699
4700 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4701 goto error;
1da177e4 4702
479840ff
JP		 4703 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4704 goto error;
4705
053c095a
JB		 4706 nlmsg_end(skb, nlh);
4707 return 0;
caeaba79
ND		 4708
4709error:
4710 nlmsg_cancel(skb, nlh);
4711 return -EMSGSIZE;
1da177e4
LT		 4712}
4713
4714static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4715 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4716{
1da177e4 4717 struct nlmsghdr *nlh;
101bb229
TG		 4718 u8 scope = RT_SCOPE_UNIVERSE;
4719 int ifindex = ifmca->idev->dev->ifindex;
4720
4721 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4722 scope = RT_SCOPE_SITE;
1da177e4 4723
15e47304 4724 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4725 if (!nlh)
26932566 4726 return -EMSGSIZE;
85486af0 4727
0ab6803b 4728 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4729 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4730 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4731 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4732 nlmsg_cancel(skb, nlh);
4733 return -EMSGSIZE;
4734 }
85486af0 4735
053c095a
JB		 4736 nlmsg_end(skb, nlh);
4737 return 0;
1da177e4
LT		 4738}
4739
4740static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4741 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4742{
1da177e4 4743 struct nlmsghdr *nlh;
101bb229
TG		 4744 u8 scope = RT_SCOPE_UNIVERSE;
4745 int ifindex = ifaca->aca_idev->dev->ifindex;
4746
4747 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4748 scope = RT_SCOPE_SITE;
1da177e4 4749
15e47304 4750 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4751 if (!nlh)
26932566 4752 return -EMSGSIZE;
85486af0 4753
0ab6803b 4754 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4755 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4756 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4757 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4758 nlmsg_cancel(skb, nlh);
4759 return -EMSGSIZE;
4760 }
1da177e4 4761
053c095a
JB		 4762 nlmsg_end(skb, nlh);
4763 return 0;
1da177e4
LT		 4764}
4765
e21e8467 4766enum addr_type_t {
1da177e4
LT		 4767 UNICAST_ADDR,
4768 MULTICAST_ADDR,
4769 ANYCAST_ADDR,
4770};
4771
234b27c3
ED		 4772/* called with rcu_read_lock() */
4773static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4774 struct netlink_callback *cb, enum addr_type_t type,
4775 int s_ip_idx, int *p_ip_idx)
4776{
234b27c3
ED		 4777 struct ifmcaddr6 *ifmca;
4778 struct ifacaddr6 *ifaca;
4779 int err = 1;
4780 int ip_idx = *p_ip_idx;
4781
4782 read_lock_bh(&idev->lock);
4783 switch (type) {
502a2ffd 4784 case UNICAST_ADDR: {
4785 struct inet6_ifaddr *ifa;
4786
234b27c3 4787 /* unicast address incl. temp addr */
502a2ffd 4788 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4789 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4790 continue;
4791 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4792 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4793 cb->nlh->nlmsg_seq,
4794 RTM_NEWADDR,
4795 NLM_F_MULTI);
053c095a 4796 if (err < 0)
234b27c3 4797 break;
63998ac2 4798 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4799 }
4800 break;
502a2ffd 4801 }
234b27c3
ED		 4802 case MULTICAST_ADDR:
4803 /* multicast address */
4804 for (ifmca = idev->mc_list; ifmca;
4805 ifmca = ifmca->next, ip_idx++) {
4806 if (ip_idx < s_ip_idx)
4807 continue;
4808 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4809 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4810 cb->nlh->nlmsg_seq,
4811 RTM_GETMULTICAST,
4812 NLM_F_MULTI);
053c095a 4813 if (err < 0)
234b27c3
ED		 4814 break;
4815 }
4816 break;
4817 case ANYCAST_ADDR:
4818 /* anycast address */
4819 for (ifaca = idev->ac_list; ifaca;
4820 ifaca = ifaca->aca_next, ip_idx++) {
4821 if (ip_idx < s_ip_idx)
4822 continue;
4823 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4824 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4825 cb->nlh->nlmsg_seq,
4826 RTM_GETANYCAST,
4827 NLM_F_MULTI);
053c095a 4828 if (err < 0)
234b27c3
ED		 4829 break;
4830 }
4831 break;
4832 default:
4833 break;
4834 }
4835 read_unlock_bh(&idev->lock);
4836 *p_ip_idx = ip_idx;
4837 return err;
4838}
4839
1da177e4
LT		 4840static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4841 enum addr_type_t type)
4842{
234b27c3
ED		 4843 struct net *net = sock_net(skb->sk);
4844 int h, s_h;
1da177e4
LT		 4845 int idx, ip_idx;
4846 int s_idx, s_ip_idx;
1da177e4 4847 struct net_device *dev;
234b27c3
ED		 4848 struct inet6_dev *idev;
4849 struct hlist_head *head;
1ab1457c 4850
234b27c3
ED		 4851 s_h = cb->args[0];
4852 s_idx = idx = cb->args[1];
4853 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4854
234b27c3 4855 rcu_read_lock();
63998ac2 4856 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4857 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4858 idx = 0;
4859 head = &net->dev_index_head[h];
b67bfe0d 4860 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4861 if (idx < s_idx)
4862 goto cont;
4b97efdf 4863 if (h > s_h || idx > s_idx)
234b27c3
ED		 4864 s_ip_idx = 0;
4865 ip_idx = 0;
e21e8467
SH		 4866 idev = __in6_dev_get(dev);
4867 if (!idev)
234b27c3
ED		 4868 goto cont;
4869
4870 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4871 s_ip_idx, &ip_idx) < 0)
234b27c3 4872 goto done;
7562f876 4873cont:
234b27c3
ED		 4874 idx++;
4875 }
1da177e4 4876 }
234b27c3
ED		 4877done:
4878 rcu_read_unlock();
4879 cb->args[0] = h;
4880 cb->args[1] = idx;
4881 cb->args[2] = ip_idx;
4882
1da177e4
LT		 4883 return skb->len;
4884}
4885
4886static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4887{
4888 enum addr_type_t type = UNICAST_ADDR;
b854272b 4889
1da177e4
LT		 4890 return inet6_dump_addr(skb, cb, type);
4891}
4892
4893static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4894{
4895 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4896
1da177e4
LT		 4897 return inet6_dump_addr(skb, cb, type);
4898}
4899
4900
4901static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4902{
4903 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4904
1da177e4
LT		 4905 return inet6_dump_addr(skb, cb, type);
4906}
4907
c21ef3e3
DA		 4908static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4909 struct netlink_ext_ack *extack)
6c223828 4910{
3b1e0a65 4911 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4912 struct ifaddrmsg *ifm;
4913 struct nlattr *tb[IFA_MAX+1];
caeaba79 4914 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4915 struct net_device *dev = NULL;
4916 struct inet6_ifaddr *ifa;
4917 struct sk_buff *skb;
6c223828
NT		 4918 int err;
4919
fceb6435 4920 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4921 extack);
1b29fc2c
TG		 4922 if (err < 0)
4923 goto errout;
4924
caeaba79 4925 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
63159f29 4926 if (!addr) {
1b29fc2c
TG		 4927 err = -EINVAL;
4928 goto errout;
6c223828 4929 }
6c223828 4930
1b29fc2c 4931 ifm = nlmsg_data(nlh);
6c223828 4932 if (ifm->ifa_index)
6fda7350 4933 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4934
e21e8467
SH		 4935 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4936 if (!ifa) {
1b29fc2c
TG		 4937 err = -EADDRNOTAVAIL;
4938 goto errout;
4939 }
6c223828 4940
e21e8467
SH		 4941 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4942 if (!skb) {
6c223828 4943 err = -ENOBUFS;
1b29fc2c 4944 goto errout_ifa;
6c223828
NT		 4945 }
4946
15e47304 4947 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4948 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4949 if (err < 0) {
4950 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4951 WARN_ON(err == -EMSGSIZE);
4952 kfree_skb(skb);
4953 goto errout_ifa;
4954 }
15e47304 4955 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4956errout_ifa:
6c223828 4957 in6_ifa_put(ifa);
1b29fc2c 4958errout:
6c223828 4959 return err;
6c223828
NT		 4960}
4961
1da177e4
LT		 4962static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4963{
4964 struct sk_buff *skb;
c346dca1 4965 struct net *net = dev_net(ifa->idev->dev);
5d620266 4966 int err = -ENOBUFS;
1da177e4 4967
f784ad3d
MB		 4968 /* Don't send DELADDR notification for TENTATIVE address,
4969 * since NEWADDR notification is sent only after removing
4970 * TENTATIVE flag.
4971 */
4972 if (ifa->flags & IFA_F_TENTATIVE && event == RTM_DELADDR)
4973 return;
4974
0ab6803b 4975 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 4976 if (!skb)
5d620266
TG		 4977 goto errout;
4978
4979 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4980 if (err < 0) {
4981 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4982 WARN_ON(err == -EMSGSIZE);
4983 kfree_skb(skb);
4984 goto errout;
4985 }
1ce85fe4
PNA		 4986 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4987 return;
5d620266
TG		 4988errout:
4989 if (err < 0)
6fda7350 4990 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4991}
4992
b6f99a21 4993static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4994 __s32 *array, int bytes)
4995{
04561c1f
TG		 4996 BUG_ON(bytes < (DEVCONF_MAX * 4));
4997
1da177e4
LT		 4998 memset(array, 0, bytes);
4999 array[DEVCONF_FORWARDING] = cnf->forwarding;
5000 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5001 array[DEVCONF_MTU6] = cnf->mtu6;
5002 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5003 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5004 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5005 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5006 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 5007 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5008 jiffies_to_msecs(cnf->rtr_solicit_interval);
bd11f074
MŻ		 5009 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5010 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
93908d19
TG		 5011 array[DEVCONF_RTR_SOLICIT_DELAY] =
5012 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 5013 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 5014 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5015 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5016 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5017 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 5018 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5019 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5020 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5021 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5022 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 5023 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 5024 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 5025 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 5026 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 5027#ifdef CONFIG_IPV6_ROUTER_PREF
5028 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 5029 array[DEVCONF_RTR_PROBE_INTERVAL] =
5030 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 5031#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 5032 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
09c884d4
YH		 5033 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5034#endif
930d6ff2 5035#endif
fbea49e1 5036 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 5037 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 5038#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5039 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 5040 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 5041#endif
7bc570c8
YH		 5042#ifdef CONFIG_IPV6_MROUTE
5043 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5044#endif
778d80be 5045 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 5046 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 5047 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 5048 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 5049 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 5050 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 5051 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 5052 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 5053 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 5054 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 5055 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 5056 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 5057 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1ababeba 5058 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
bf355b8d
DL		 5059#ifdef CONFIG_IPV6_SEG6_HMAC
5060 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5061#endif
adc176c5 5062 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
d35a00b8 5063 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
df789fe7 5064 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
1da177e4
LT		 5065}
5066
b382b191
TG		 5067static inline size_t inet6_ifla6_size(void)
5068{
5069 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5070 + nla_total_size(sizeof(struct ifla_cacheinfo))
5071 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5072 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 5073 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5074 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 5075}
5076
339bf98f
TG		 5077static inline size_t inet6_if_nlmsg_size(void)
5078{
5079 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5080 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5081 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5082 + nla_total_size(4) /* IFLA_MTU */
5083 + nla_total_size(4) /* IFLA_LINK */
0344338b 5084 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 5085 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 5086}
c5396a31 5087
be281e55 5088static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
aca05671 5089 int bytes)
7f7d9a6b
HX		 5090{
5091 int i;
aca05671 5092 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
7f7d9a6b
HX		 5093 BUG_ON(pad < 0);
5094
5095 /* Use put_unaligned() because stats may not be aligned for u64. */
aca05671
JH		 5096 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5097 for (i = 1; i < ICMP6_MIB_MAX; i++)
be281e55 5098 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b 5099
aca05671 5100 memset(&stats[ICMP6_MIB_MAX], 0, pad);
7f7d9a6b
HX		 5101}
5102
698365fa 5103static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 5104 int bytes, size_t syncpoff)
4ce3c183 5105{
a3a77372
R		 5106 int i, c;
5107 u64 buff[IPSTATS_MIB_MAX];
5108 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5109
4ce3c183
ED		 5110 BUG_ON(pad < 0);
5111
a3a77372
R		 5112 memset(buff, 0, sizeof(buff));
5113 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 5114
a3a77372
R		 5115 for_each_possible_cpu(c) {
5116 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5117 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5118 }
5119
5120 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5121 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 5122}
5123
7f7d9a6b
HX		 5124static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5125 int bytes)
5126{
e21e8467 5127 switch (attrtype) {
7f7d9a6b 5128 case IFLA_INET6_STATS:
a3a77372
R		 5129 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5130 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 5131 break;
5132 case IFLA_INET6_ICMP6STATS:
aca05671 5133 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
7f7d9a6b
HX		 5134 break;
5135 }
5136}
5137
d5566fd7
SV		 5138static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5139 u32 ext_filter_mask)
b382b191
TG		 5140{
5141 struct nlattr *nla;
5142 struct ifla_cacheinfo ci;
5143
c78679e8
DM		 5144 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5145 goto nla_put_failure;
b382b191 5146 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 5147 ci.tstamp = cstamp_delta(idev->tstamp);
5148 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 5149 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 5150 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5151 goto nla_put_failure;
b382b191 5152 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 5153 if (!nla)
b382b191
TG		 5154 goto nla_put_failure;
5155 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5156
5157 /* XXX - MC not implemented */
5158
d5566fd7
SV		 5159 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5160 return 0;
5161
b382b191 5162 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 5163 if (!nla)
b382b191
TG		 5164 goto nla_put_failure;
5165 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5166
5167 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 5168 if (!nla)
b382b191
TG		 5169 goto nla_put_failure;
5170 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5171
f53adae4 5172 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 5173 if (!nla)
f53adae4 5174 goto nla_put_failure;
bc91b0f0 5175
d35a00b8 5176 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
bc91b0f0
JP		 5177 goto nla_put_failure;
5178
f53adae4
DB		 5179 read_lock_bh(&idev->lock);
5180 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5181 read_unlock_bh(&idev->lock);
5182
b382b191
TG		 5183 return 0;
5184
5185nla_put_failure:
5186 return -EMSGSIZE;
5187}
5188
b1974ed0
AR		 5189static size_t inet6_get_link_af_size(const struct net_device *dev,
5190 u32 ext_filter_mask)
b382b191
TG		 5191{
5192 if (!__in6_dev_get(dev))
5193 return 0;
5194
5195 return inet6_ifla6_size();
5196}
5197
d5566fd7
SV		 5198static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5199 u32 ext_filter_mask)
b382b191
TG		 5200{
5201 struct inet6_dev *idev = __in6_dev_get(dev);
5202
5203 if (!idev)
5204 return -ENODATA;
5205
d5566fd7 5206 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5207 return -EMSGSIZE;
5208
5209 return 0;
5210}
5211
f53adae4
DB		 5212static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5213{
f53adae4
DB		 5214 struct inet6_ifaddr *ifp;
5215 struct net_device *dev = idev->dev;
47e27d5e 5216 bool clear_token, update_rs = false;
dc848292 5217 struct in6_addr ll_addr;
f53adae4 5218
c15b1cca
HFS		 5219 ASSERT_RTNL();
5220
63159f29 5221 if (!token)
f53adae4 5222 return -EINVAL;
f53adae4
DB		 5223 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5224 return -EINVAL;
f53adae4
DB		 5225 if (!ipv6_accept_ra(idev))
5226 return -EINVAL;
bd11f074 5227 if (idev->cnf.rtr_solicits == 0)
f53adae4
DB		 5228 return -EINVAL;
5229
5230 write_lock_bh(&idev->lock);
5231
5232 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5233 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5234
5235 write_unlock_bh(&idev->lock);
5236
47e27d5e
DB		 5237 clear_token = ipv6_addr_any(token);
5238 if (clear_token)
5239 goto update_lft;
5240
dc848292
HFS		 5241 if (!idev->dead && (idev->if_flags & IF_READY) &&
5242 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5243 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5244 /* If we're not ready, then normal ifup will take care
5245 * of this. Otherwise, we need to request our rs here.
5246 */
5247 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5248 update_rs = true;
5249 }
f53adae4 5250
47e27d5e 5251update_lft:
f53adae4 5252 write_lock_bh(&idev->lock);
fc403832 5253
77ecaace 5254 if (update_rs) {
fc403832 5255 idev->if_flags |= IF_RS_SENT;
bd11f074
MŻ		 5256 idev->rs_interval = rfc3315_s14_backoff_init(
5257 idev->cnf.rtr_solicit_interval);
77ecaace 5258 idev->rs_probes = 1;
bd11f074 5259 addrconf_mod_rs_timer(idev, idev->rs_interval);
77ecaace 5260 }
f53adae4
DB		 5261
5262 /* Well, that's kinda nasty ... */
5263 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5264 spin_lock(&ifp->lock);
617fe29d 5265 if (ifp->tokenized) {
f53adae4
DB		 5266 ifp->valid_lft = 0;
5267 ifp->prefered_lft = 0;
5268 }
5269 spin_unlock(&ifp->lock);
5270 }
5271
5272 write_unlock_bh(&idev->lock);
b2ed64a9 5273 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 5274 addrconf_verify_rtnl();
f53adae4
DB		 5275 return 0;
5276}
5277
11b1f828
DB		 5278static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5279 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5280 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5281};
5282
5283static int inet6_validate_link_af(const struct net_device *dev,
5284 const struct nlattr *nla)
5285{
5286 struct nlattr *tb[IFLA_INET6_MAX + 1];
5287
5288 if (dev && !__in6_dev_get(dev))
5289 return -EAFNOSUPPORT;
5290
fceb6435
JB		 5291 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5292 NULL);
11b1f828
DB		 5293}
5294
d35a00b8
FJ		 5295static int check_addr_gen_mode(int mode)
5296{
5297 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5298 mode != IN6_ADDR_GEN_MODE_NONE &&
5299 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5300 mode != IN6_ADDR_GEN_MODE_RANDOM)
5301 return -EINVAL;
5302 return 1;
5303}
5304
5305static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5306 int mode)
5307{
5308 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5309 !idev->cnf.stable_secret.initialized &&
5310 !net->ipv6.devconf_dflt->stable_secret.initialized)
5311 return -EINVAL;
5312 return 1;
5313}
5314
f53adae4
DB		 5315static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5316{
5317 int err = -EINVAL;
5318 struct inet6_dev *idev = __in6_dev_get(dev);
5319 struct nlattr *tb[IFLA_INET6_MAX + 1];
5320
5321 if (!idev)
5322 return -EAFNOSUPPORT;
5323
fceb6435 5324 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
f53adae4
DB		 5325 BUG();
5326
bc91b0f0 5327 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 5328 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 5329 if (err)
5330 return err;
5331 }
5332
5333 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5334 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5335
d35a00b8
FJ		 5336 if (check_addr_gen_mode(mode) < 0 ||
5337 check_stable_privacy(idev, dev_net(dev), mode) < 0)
bc91b0f0 5338 return -EINVAL;
622c81d5 5339
d35a00b8 5340 idev->cnf.addr_gen_mode = mode;
bc91b0f0
JP		 5341 err = 0;
5342 }
f53adae4
DB		 5343
5344 return err;
5345}
5346
1ab1457c 5347static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5348 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5349{
04561c1f 5350 struct net_device *dev = idev->dev;
04561c1f
TG		 5351 struct ifinfomsg *hdr;
5352 struct nlmsghdr *nlh;
5353 void *protoinfo;
04561c1f 5354
15e47304 5355 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5356 if (!nlh)
26932566 5357 return -EMSGSIZE;
04561c1f
TG		 5358
5359 hdr = nlmsg_data(nlh);
5360 hdr->ifi_family = AF_INET6;
5361 hdr->__ifi_pad = 0;
5362 hdr->ifi_type = dev->type;
5363 hdr->ifi_index = dev->ifindex;
5364 hdr->ifi_flags = dev_get_flags(dev);
5365 hdr->ifi_change = 0;
5366
c78679e8
DM		 5367 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5368 (dev->addr_len &&
5369 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5370 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5371 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5372 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5373 nla_put_u8(skb, IFLA_OPERSTATE,
5374 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5375 goto nla_put_failure;
04561c1f 5376 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 5377 if (!protoinfo)
04561c1f 5378 goto nla_put_failure;
1da177e4 5379
d5566fd7 5380 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5381 goto nla_put_failure;
1da177e4 5382
04561c1f 5383 nla_nest_end(skb, protoinfo);
053c095a
JB		 5384 nlmsg_end(skb, nlh);
5385 return 0;
1da177e4 5386
04561c1f 5387nla_put_failure:
26932566
PM		 5388 nlmsg_cancel(skb, nlh);
5389 return -EMSGSIZE;
1da177e4
LT		 5390}
5391
5392static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5393{
3b1e0a65 5394 struct net *net = sock_net(skb->sk);
84d2697d 5395 int h, s_h;
434a8a58 5396 int idx = 0, s_idx;
1da177e4
LT		 5397 struct net_device *dev;
5398 struct inet6_dev *idev;
84d2697d 5399 struct hlist_head *head;
1da177e4 5400
84d2697d
ED		 5401 s_h = cb->args[0];
5402 s_idx = cb->args[1];
5403
5404 rcu_read_lock();
5405 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5406 idx = 0;
5407 head = &net->dev_index_head[h];
b67bfe0d 5408 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5409 if (idx < s_idx)
5410 goto cont;
5411 idev = __in6_dev_get(dev);
5412 if (!idev)
5413 goto cont;
5414 if (inet6_fill_ifinfo(skb, idev,
15e47304 5415 NETLINK_CB(cb->skb).portid,
84d2697d 5416 cb->nlh->nlmsg_seq,
053c095a 5417 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5418 goto out;
7562f876 5419cont:
84d2697d
ED		 5420 idx++;
5421 }
1da177e4 5422 }
84d2697d
ED		 5423out:
5424 rcu_read_unlock();
5425 cb->args[1] = idx;
5426 cb->args[0] = h;
1da177e4
LT		 5427
5428 return skb->len;
5429}
5430
5431void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5432{
5433 struct sk_buff *skb;
c346dca1 5434 struct net *net = dev_net(idev->dev);
8d7a76c9 5435 int err = -ENOBUFS;
1ab1457c 5436
339bf98f 5437 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5438 if (!skb)
8d7a76c9
TG		 5439 goto errout;
5440
5441 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5442 if (err < 0) {
5443 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5444 WARN_ON(err == -EMSGSIZE);
5445 kfree_skb(skb);
5446 goto errout;
5447 }
5f75a104 5448 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5449 return;
8d7a76c9
TG		 5450errout:
5451 if (err < 0)
5f75a104 5452 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5453}
5454
339bf98f
TG		 5455static inline size_t inet6_prefix_nlmsg_size(void)
5456{
5457 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5458 + nla_total_size(sizeof(struct in6_addr))
5459 + nla_total_size(sizeof(struct prefix_cacheinfo));
5460}
c5396a31 5461
1da177e4 5462static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5463 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5464 int event, unsigned int flags)
1da177e4 5465{
6051e2f4
TG		 5466 struct prefixmsg *pmsg;
5467 struct nlmsghdr *nlh;
1da177e4
LT		 5468 struct prefix_cacheinfo ci;
5469
15e47304 5470 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5471 if (!nlh)
26932566 5472 return -EMSGSIZE;
6051e2f4
TG		 5473
5474 pmsg = nlmsg_data(nlh);
1da177e4 5475 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5476 pmsg->prefix_pad1 = 0;
5477 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5478 pmsg->prefix_ifindex = idev->dev->ifindex;
5479 pmsg->prefix_len = pinfo->prefix_len;
5480 pmsg->prefix_type = pinfo->type;
8a47077a 5481 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5482 pmsg->prefix_flags = 0;
5483 if (pinfo->onlink)
5484 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5485 if (pinfo->autoconf)
5486 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5487
c78679e8
DM		 5488 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5489 goto nla_put_failure;
1da177e4
LT		 5490 ci.preferred_time = ntohl(pinfo->prefered);
5491 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5492 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5493 goto nla_put_failure;
053c095a
JB		 5494 nlmsg_end(skb, nlh);
5495 return 0;
1da177e4 5496
6051e2f4 5497nla_put_failure:
26932566
PM		 5498 nlmsg_cancel(skb, nlh);
5499 return -EMSGSIZE;
1da177e4
LT		 5500}
5501
1ab1457c 5502static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5503 struct prefix_info *pinfo)
5504{
5505 struct sk_buff *skb;
c346dca1 5506 struct net *net = dev_net(idev->dev);
8c384bfa 5507 int err = -ENOBUFS;
1da177e4 5508
339bf98f 5509 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5510 if (!skb)
8c384bfa
TG		 5511 goto errout;
5512
5513 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5514 if (err < 0) {
5515 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5516 WARN_ON(err == -EMSGSIZE);
5517 kfree_skb(skb);
5518 goto errout;
5519 }
1ce85fe4
PNA		 5520 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5521 return;
8c384bfa
TG		 5522errout:
5523 if (err < 0)
6fda7350 5524 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5525}
5526
1da177e4
LT		 5527static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5528{
63998ac2
ND		 5529 struct net *net = dev_net(ifp->idev->dev);
5530
c15b1cca
HFS		 5531 if (event)
5532 ASSERT_RTNL();
5533
1da177e4
LT		 5534 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5535
5536 switch (event) {
5537 case RTM_NEWADDR:
95c385b4
NH		 5538 /*
5539 * If the address was optimistic
5540 * we inserted the route at the start of
5541 * our DAD process, so we don't need
5542 * to do it again
5543 */
5544 if (!(ifp->rt->rt6i_node))
5545 ip6_ins_rt(ifp->rt);
1da177e4
LT		 5546 if (ifp->idev->cnf.forwarding)
5547 addrconf_join_anycast(ifp);
7996c799 5548 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 5549 addrconf_prefix_route(&ifp->peer_addr, 128,
5550 ifp->idev->dev, 0, 0);
1da177e4
LT		 5551 break;
5552 case RTM_DELADDR:
5553 if (ifp->idev->cnf.forwarding)
5554 addrconf_leave_anycast(ifp);
5555 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5556 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 5557 struct rt6_info *rt;
caeaba79 5558
e7478dfc
ND		 5559 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5560 ifp->idev->dev, 0, 0);
8e3d5be7
MKL		 5561 if (rt)
5562 ip6_del_rt(rt);
caeaba79 5563 }
38bd10c4
DA		 5564 if (ifp->rt) {
5565 dst_hold(&ifp->rt->dst);
5566 ip6_del_rt(ifp->rt);
5567 }
705f1c86 5568 rt_genid_bump_ipv6(net);
1da177e4
LT		 5569 break;
5570 }
63998ac2 5571 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5572}
5573
5574static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5575{
8814c4b5 5576 rcu_read_lock_bh();
1da177e4
LT		 5577 if (likely(ifp->idev->dead == 0))
5578 __ipv6_ifa_notify(event, ifp);
8814c4b5 5579 rcu_read_unlock_bh();
1da177e4
LT		 5580}
5581
5582#ifdef CONFIG_SYSCTL
5583
5584static
fe2c6338 5585int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5586 void __user *buffer, size_t *lenp, loff_t *ppos)
5587{
5588 int *valp = ctl->data;
5589 int val = *valp;
88af182e 5590 loff_t pos = *ppos;
fe2c6338 5591 struct ctl_table lctl;
1da177e4
LT		 5592 int ret;
5593
013d97e9
FR		 5594 /*
5595 * ctl->data points to idev->cnf.forwarding, we should
5596 * not modify it until we get the rtnl lock.
5597 */
5598 lctl = *ctl;
5599 lctl.data = &val;
5600
5601 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5602
c8fecf22 5603 if (write)
b325fddb 5604 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5605 if (ret)
5606 *ppos = pos;
1ab1457c 5607 return ret;
1da177e4
LT		 5608}
5609
77751427
ML		 5610static
5611int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5612 void __user *buffer, size_t *lenp, loff_t *ppos)
5613{
5614 struct inet6_dev *idev = ctl->extra1;
5615 int min_mtu = IPV6_MIN_MTU;
5616 struct ctl_table lctl;
5617
5618 lctl = *ctl;
5619 lctl.extra1 = &min_mtu;
5620 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5621
5622 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5623}
5624
56d417b1
BH		 5625static void dev_disable_change(struct inet6_dev *idev)
5626{
75538c2b
CW		 5627 struct netdev_notifier_info info;
5628
56d417b1
BH		 5629 if (!idev || !idev->dev)
5630 return;
5631
75538c2b 5632 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5633 if (idev->cnf.disable_ipv6)
75538c2b 5634 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5635 else
75538c2b 5636 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5637}
5638
5639static void addrconf_disable_change(struct net *net, __s32 newf)
5640{
5641 struct net_device *dev;
5642 struct inet6_dev *idev;
5643
03e4deff 5644 for_each_netdev(net, dev) {
56d417b1
BH		 5645 idev = __in6_dev_get(dev);
5646 if (idev) {
5647 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5648 idev->cnf.disable_ipv6 = newf;
5649 if (changed)
5650 dev_disable_change(idev);
5651 }
56d417b1 5652 }
56d417b1
BH		 5653}
5654
013d97e9 5655static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5656{
5657 struct net *net;
013d97e9
FR		 5658 int old;
5659
5660 if (!rtnl_trylock())
5661 return restart_syscall();
56d417b1
BH		 5662
5663 net = (struct net *)table->extra2;
013d97e9
FR		 5664 old = *p;
5665 *p = newf;
56d417b1 5666
013d97e9
FR		 5667 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5668 rtnl_unlock();
56d417b1 5669 return 0;
88af182e 5670 }
56d417b1
BH		 5671
5672 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5673 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5674 addrconf_disable_change(net, newf);
013d97e9 5675 } else if ((!newf) ^ (!old))
56d417b1
BH		 5676 dev_disable_change((struct inet6_dev *)table->extra1);
5677
5678 rtnl_unlock();
5679 return 0;
5680}
5681
5682static
fe2c6338 5683int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5684 void __user *buffer, size_t *lenp, loff_t *ppos)
5685{
5686 int *valp = ctl->data;
5687 int val = *valp;
88af182e 5688 loff_t pos = *ppos;
fe2c6338 5689 struct ctl_table lctl;
56d417b1
BH		 5690 int ret;
5691
013d97e9
FR		 5692 /*
5693 * ctl->data points to idev->cnf.disable_ipv6, we should
5694 * not modify it until we get the rtnl lock.
5695 */
5696 lctl = *ctl;
5697 lctl.data = &val;
5698
5699 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5700
5701 if (write)
5702 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5703 if (ret)
5704 *ppos = pos;
56d417b1
BH		 5705 return ret;
5706}
5707
c92d5491 5708static
5709int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5710 void __user *buffer, size_t *lenp, loff_t *ppos)
5711{
5712 int *valp = ctl->data;
5713 int ret;
5714 int old, new;
5715
5716 old = *valp;
5717 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5718 new = *valp;
5719
5720 if (write && old != new) {
5721 struct net *net = ctl->extra2;
5722
5723 if (!rtnl_trylock())
5724 return restart_syscall();
5725
5726 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
85b3daad
DA		 5727 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5728 NETCONFA_PROXY_NEIGH,
c92d5491 5729 NETCONFA_IFINDEX_DEFAULT,
5730 net->ipv6.devconf_dflt);
5731 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
85b3daad
DA		 5732 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5733 NETCONFA_PROXY_NEIGH,
c92d5491 5734 NETCONFA_IFINDEX_ALL,
5735 net->ipv6.devconf_all);
5736 else {
5737 struct inet6_dev *idev = ctl->extra1;
5738
85b3daad
DA		 5739 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5740 NETCONFA_PROXY_NEIGH,
c92d5491 5741 idev->dev->ifindex,
5742 &idev->cnf);
5743 }
5744 rtnl_unlock();
5745 }
5746
5747 return ret;
5748}
5749
d35a00b8
FJ		 5750static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5751 void __user *buffer, size_t *lenp,
5752 loff_t *ppos)
5753{
5754 int ret = 0;
5755 int new_val;
5756 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5757 struct net *net = (struct net *)ctl->extra2;
5758
8c171d6c
FJ		 5759 if (!rtnl_trylock())
5760 return restart_syscall();
5761
d35a00b8
FJ		 5762 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5763
5764 if (write) {
5765 new_val = *((int *)ctl->data);
5766
8c171d6c
FJ		 5767 if (check_addr_gen_mode(new_val) < 0) {
5768 ret = -EINVAL;
5769 goto out;
5770 }
d35a00b8
FJ		 5771
5772 /* request for default */
5773 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5774 ipv6_devconf_dflt.addr_gen_mode = new_val;
5775
5776 /* request for individual net device */
5777 } else {
5778 if (!idev)
8c171d6c 5779 goto out;
d35a00b8 5780
8c171d6c
FJ		 5781 if (check_stable_privacy(idev, net, new_val) < 0) {
5782 ret = -EINVAL;
5783 goto out;
5784 }
d35a00b8
FJ		 5785
5786 if (idev->cnf.addr_gen_mode != new_val) {
5787 idev->cnf.addr_gen_mode = new_val;
d35a00b8 5788 addrconf_dev_config(idev->dev);
d35a00b8
FJ		 5789 }
5790 }
5791 }
5792
8c171d6c
FJ		 5793out:
5794 rtnl_unlock();
5795
d35a00b8
FJ		 5796 return ret;
5797}
5798
3d1bec99
HFS		 5799static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5800 void __user *buffer, size_t *lenp,
5801 loff_t *ppos)
5802{
5803 int err;
5804 struct in6_addr addr;
5805 char str[IPV6_MAX_STRLEN];
5806 struct ctl_table lctl = *ctl;
622c81d5 5807 struct net *net = ctl->extra2;
3d1bec99
HFS		 5808 struct ipv6_stable_secret *secret = ctl->data;
5809
622c81d5
HFS		 5810 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5811 return -EIO;
5812
3d1bec99
HFS		 5813 lctl.maxlen = IPV6_MAX_STRLEN;
5814 lctl.data = str;
5815
5816 if (!rtnl_trylock())
5817 return restart_syscall();
5818
5819 if (!write && !secret->initialized) {
5820 err = -EIO;
5821 goto out;
5822 }
5823
5449a5ca
WC		 5824 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5825 if (err >= sizeof(str)) {
5826 err = -EIO;
5827 goto out;
3d1bec99
HFS		 5828 }
5829
5830 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5831 if (err || !write)
5832 goto out;
5833
5834 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5835 err = -EIO;
5836 goto out;
5837 }
5838
5839 secret->initialized = true;
5840 secret->secret = addr;
5841
622c81d5
HFS		 5842 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5843 struct net_device *dev;
5844
5845 for_each_netdev(net, dev) {
5846 struct inet6_dev *idev = __in6_dev_get(dev);
5847
5848 if (idev) {
d35a00b8 5849 idev->cnf.addr_gen_mode =
622c81d5
HFS		 5850 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5851 }
5852 }
5853 } else {
5854 struct inet6_dev *idev = ctl->extra1;
5855
d35a00b8 5856 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
622c81d5
HFS		 5857 }
5858
3d1bec99
HFS		 5859out:
5860 rtnl_unlock();
5861
5862 return err;
5863}
c92d5491 5864
35103d11
AG		 5865static
5866int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5867 int write,
5868 void __user *buffer,
5869 size_t *lenp,
5870 loff_t *ppos)
5871{
5872 int *valp = ctl->data;
5873 int val = *valp;
5874 loff_t pos = *ppos;
5875 struct ctl_table lctl;
5876 int ret;
5877
5878 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5879 * we should not modify it until we get the rtnl lock.
5880 */
5881 lctl = *ctl;
5882 lctl.data = &val;
5883
5884 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5885
5886 if (write)
5887 ret = addrconf_fixup_linkdown(ctl, valp, val);
5888 if (ret)
5889 *ppos = pos;
5890 return ret;
5891}
5892
df789fe7
DF		 5893static
5894void addrconf_set_nopolicy(struct rt6_info *rt, int action)
5895{
5896 if (rt) {
5897 if (action)
5898 rt->dst.flags |= DST_NOPOLICY;
5899 else
5900 rt->dst.flags &= ~DST_NOPOLICY;
5901 }
5902}
5903
5904static
5905void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
5906{
5907 struct inet6_ifaddr *ifa;
5908
5909 read_lock_bh(&idev->lock);
5910 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5911 spin_lock(&ifa->lock);
5912 if (ifa->rt) {
5913 struct rt6_info *rt = ifa->rt;
5914 struct fib6_table *table = rt->rt6i_table;
5915 int cpu;
5916
5917 read_lock(&table->tb6_lock);
5918 addrconf_set_nopolicy(ifa->rt, val);
5919 if (rt->rt6i_pcpu) {
5920 for_each_possible_cpu(cpu) {
5921 struct rt6_info **rtp;
5922
5923 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
5924 addrconf_set_nopolicy(*rtp, val);
5925 }
5926 }
5927 read_unlock(&table->tb6_lock);
5928 }
5929 spin_unlock(&ifa->lock);
5930 }
5931 read_unlock_bh(&idev->lock);
5932}
5933
5934static
5935int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
5936{
5937 struct inet6_dev *idev;
5938 struct net *net;
5939
5940 if (!rtnl_trylock())
5941 return restart_syscall();
5942
5943 *valp = val;
5944
5945 net = (struct net *)ctl->extra2;
5946 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
5947 rtnl_unlock();
5948 return 0;
5949 }
5950
5951 if (valp == &net->ipv6.devconf_all->disable_policy) {
5952 struct net_device *dev;
5953
5954 for_each_netdev(net, dev) {
5955 idev = __in6_dev_get(dev);
5956 if (idev)
5957 addrconf_disable_policy_idev(idev, val);
5958 }
5959 } else {
5960 idev = (struct inet6_dev *)ctl->extra1;
5961 addrconf_disable_policy_idev(idev, val);
5962 }
5963
5964 rtnl_unlock();
5965 return 0;
5966}
5967
5968static
5969int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
5970 void __user *buffer, size_t *lenp,
5971 loff_t *ppos)
5972{
5973 int *valp = ctl->data;
5974 int val = *valp;
5975 loff_t pos = *ppos;
5976 struct ctl_table lctl;
5977 int ret;
5978
5979 lctl = *ctl;
5980 lctl.data = &val;
5981 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5982
5983 if (write && (*valp != val))
5984 ret = addrconf_disable_policy(ctl, valp, val);
5985
5986 if (ret)
5987 *ppos = pos;
5988
5989 return ret;
5990}
5991
cb4a4c69 5992static int minus_one = -1;
cb9e684e
MŻ		 5993static const int one = 1;
5994static const int two_five_five = 255;
5995
607ea7cd 5996static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 5997 {
5998 .procname = "forwarding",
5999 .data = &ipv6_devconf.forwarding,
6000 .maxlen = sizeof(int),
6001 .mode = 0644,
6002 .proc_handler = addrconf_sysctl_forward,
6003 },
6004 {
6005 .procname = "hop_limit",
6006 .data = &ipv6_devconf.hop_limit,
6007 .maxlen = sizeof(int),
6008 .mode = 0644,
cb9e684e
MŻ		 6009 .proc_handler = proc_dointvec_minmax,
6010 .extra1 = (void *)&one,
6011 .extra2 = (void *)&two_five_five,
5df1f77f
KK		 6012 },
6013 {
6014 .procname = "mtu",
6015 .data = &ipv6_devconf.mtu6,
6016 .maxlen = sizeof(int),
6017 .mode = 0644,
6018 .proc_handler = addrconf_sysctl_mtu,
6019 },
6020 {
6021 .procname = "accept_ra",
6022 .data = &ipv6_devconf.accept_ra,
6023 .maxlen = sizeof(int),
6024 .mode = 0644,
6025 .proc_handler = proc_dointvec,
6026 },
6027 {
6028 .procname = "accept_redirects",
6029 .data = &ipv6_devconf.accept_redirects,
6030 .maxlen = sizeof(int),
6031 .mode = 0644,
6032 .proc_handler = proc_dointvec,
6033 },
6034 {
6035 .procname = "autoconf",
6036 .data = &ipv6_devconf.autoconf,
6037 .maxlen = sizeof(int),
6038 .mode = 0644,
6039 .proc_handler = proc_dointvec,
6040 },
6041 {
6042 .procname = "dad_transmits",
6043 .data = &ipv6_devconf.dad_transmits,
6044 .maxlen = sizeof(int),
6045 .mode = 0644,
6046 .proc_handler = proc_dointvec,
6047 },
6048 {
6049 .procname = "router_solicitations",
6050 .data = &ipv6_devconf.rtr_solicits,
6051 .maxlen = sizeof(int),
6052 .mode = 0644,
cb4a4c69
MŻ		 6053 .proc_handler = proc_dointvec_minmax,
6054 .extra1 = &minus_one,
5df1f77f
KK		 6055 },
6056 {
6057 .procname = "router_solicitation_interval",
6058 .data = &ipv6_devconf.rtr_solicit_interval,
6059 .maxlen = sizeof(int),
6060 .mode = 0644,
6061 .proc_handler = proc_dointvec_jiffies,
6062 },
bd11f074
MŻ		 6063 {
6064 .procname = "router_solicitation_max_interval",
6065 .data = &ipv6_devconf.rtr_solicit_max_interval,
6066 .maxlen = sizeof(int),
6067 .mode = 0644,
6068 .proc_handler = proc_dointvec_jiffies,
6069 },
5df1f77f
KK		 6070 {
6071 .procname = "router_solicitation_delay",
6072 .data = &ipv6_devconf.rtr_solicit_delay,
6073 .maxlen = sizeof(int),
6074 .mode = 0644,
6075 .proc_handler = proc_dointvec_jiffies,
6076 },
6077 {
6078 .procname = "force_mld_version",
6079 .data = &ipv6_devconf.force_mld_version,
6080 .maxlen = sizeof(int),
6081 .mode = 0644,
6082 .proc_handler = proc_dointvec,
6083 },
6084 {
6085 .procname = "mldv1_unsolicited_report_interval",
6086 .data =
6087 &ipv6_devconf.mldv1_unsolicited_report_interval,
6088 .maxlen = sizeof(int),
6089 .mode = 0644,
6090 .proc_handler = proc_dointvec_ms_jiffies,
6091 },
6092 {
6093 .procname = "mldv2_unsolicited_report_interval",
6094 .data =
6095 &ipv6_devconf.mldv2_unsolicited_report_interval,
6096 .maxlen = sizeof(int),
6097 .mode = 0644,
6098 .proc_handler = proc_dointvec_ms_jiffies,
6099 },
6100 {
6101 .procname = "use_tempaddr",
6102 .data = &ipv6_devconf.use_tempaddr,
6103 .maxlen = sizeof(int),
6104 .mode = 0644,
6105 .proc_handler = proc_dointvec,
6106 },
6107 {
6108 .procname = "temp_valid_lft",
6109 .data = &ipv6_devconf.temp_valid_lft,
6110 .maxlen = sizeof(int),
6111 .mode = 0644,
6112 .proc_handler = proc_dointvec,
6113 },
6114 {
6115 .procname = "temp_prefered_lft",
6116 .data = &ipv6_devconf.temp_prefered_lft,
6117 .maxlen = sizeof(int),
6118 .mode = 0644,
6119 .proc_handler = proc_dointvec,
6120 },
6121 {
6122 .procname = "regen_max_retry",
6123 .data = &ipv6_devconf.regen_max_retry,
6124 .maxlen = sizeof(int),
6125 .mode = 0644,
6126 .proc_handler = proc_dointvec,
6127 },
6128 {
6129 .procname = "max_desync_factor",
6130 .data = &ipv6_devconf.max_desync_factor,
6131 .maxlen = sizeof(int),
6132 .mode = 0644,
6133 .proc_handler = proc_dointvec,
6134 },
6135 {
6136 .procname = "max_addresses",
6137 .data = &ipv6_devconf.max_addresses,
6138 .maxlen = sizeof(int),
6139 .mode = 0644,
6140 .proc_handler = proc_dointvec,
6141 },
6142 {
6143 .procname = "accept_ra_defrtr",
6144 .data = &ipv6_devconf.accept_ra_defrtr,
6145 .maxlen = sizeof(int),
6146 .mode = 0644,
6147 .proc_handler = proc_dointvec,
6148 },
6149 {
6150 .procname = "accept_ra_min_hop_limit",
6151 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6152 .maxlen = sizeof(int),
6153 .mode = 0644,
6154 .proc_handler = proc_dointvec,
6155 },
6156 {
6157 .procname = "accept_ra_pinfo",
6158 .data = &ipv6_devconf.accept_ra_pinfo,
6159 .maxlen = sizeof(int),
6160 .mode = 0644,
6161 .proc_handler = proc_dointvec,
6162 },
930d6ff2 6163#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 6164 {
6165 .procname = "accept_ra_rtr_pref",
6166 .data = &ipv6_devconf.accept_ra_rtr_pref,
6167 .maxlen = sizeof(int),
6168 .mode = 0644,
6169 .proc_handler = proc_dointvec,
6170 },
6171 {
6172 .procname = "router_probe_interval",
6173 .data = &ipv6_devconf.rtr_probe_interval,
6174 .maxlen = sizeof(int),
6175 .mode = 0644,
6176 .proc_handler = proc_dointvec_jiffies,
6177 },
fa03ef38 6178#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b
JS		 6179 {
6180 .procname = "accept_ra_rt_info_min_plen",
6181 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6182 .maxlen = sizeof(int),
6183 .mode = 0644,
6184 .proc_handler = proc_dointvec,
6185 },
5df1f77f
KK		 6186 {
6187 .procname = "accept_ra_rt_info_max_plen",
6188 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6189 .maxlen = sizeof(int),
6190 .mode = 0644,
6191 .proc_handler = proc_dointvec,
6192 },
09c884d4 6193#endif
930d6ff2 6194#endif
5df1f77f
KK		 6195 {
6196 .procname = "proxy_ndp",
6197 .data = &ipv6_devconf.proxy_ndp,
6198 .maxlen = sizeof(int),
6199 .mode = 0644,
6200 .proc_handler = addrconf_sysctl_proxy_ndp,
6201 },
6202 {
6203 .procname = "accept_source_route",
6204 .data = &ipv6_devconf.accept_source_route,
6205 .maxlen = sizeof(int),
6206 .mode = 0644,
6207 .proc_handler = proc_dointvec,
6208 },
95c385b4 6209#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 6210 {
6211 .procname = "optimistic_dad",
6212 .data = &ipv6_devconf.optimistic_dad,
6213 .maxlen = sizeof(int),
6214 .mode = 0644,
6215 .proc_handler = proc_dointvec,
6216 },
6217 {
6218 .procname = "use_optimistic",
6219 .data = &ipv6_devconf.use_optimistic,
6220 .maxlen = sizeof(int),
6221 .mode = 0644,
6222 .proc_handler = proc_dointvec,
6223 },
7bc570c8
YH		 6224#endif
6225#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 6226 {
6227 .procname = "mc_forwarding",
6228 .data = &ipv6_devconf.mc_forwarding,
6229 .maxlen = sizeof(int),
6230 .mode = 0444,
6231 .proc_handler = proc_dointvec,
6232 },
95c385b4 6233#endif
5df1f77f
KK		 6234 {
6235 .procname = "disable_ipv6",
6236 .data = &ipv6_devconf.disable_ipv6,
6237 .maxlen = sizeof(int),
6238 .mode = 0644,
6239 .proc_handler = addrconf_sysctl_disable,
6240 },
6241 {
6242 .procname = "accept_dad",
6243 .data = &ipv6_devconf.accept_dad,
6244 .maxlen = sizeof(int),
6245 .mode = 0644,
6246 .proc_handler = proc_dointvec,
6247 },
6248 {
6249 .procname = "force_tllao",
6250 .data = &ipv6_devconf.force_tllao,
6251 .maxlen = sizeof(int),
6252 .mode = 0644,
6253 .proc_handler = proc_dointvec
6254 },
6255 {
6256 .procname = "ndisc_notify",
6257 .data = &ipv6_devconf.ndisc_notify,
6258 .maxlen = sizeof(int),
6259 .mode = 0644,
6260 .proc_handler = proc_dointvec
6261 },
6262 {
6263 .procname = "suppress_frag_ndisc",
6264 .data = &ipv6_devconf.suppress_frag_ndisc,
6265 .maxlen = sizeof(int),
6266 .mode = 0644,
6267 .proc_handler = proc_dointvec
6268 },
6269 {
6270 .procname = "accept_ra_from_local",
6271 .data = &ipv6_devconf.accept_ra_from_local,
6272 .maxlen = sizeof(int),
6273 .mode = 0644,
6274 .proc_handler = proc_dointvec,
6275 },
6276 {
6277 .procname = "accept_ra_mtu",
6278 .data = &ipv6_devconf.accept_ra_mtu,
6279 .maxlen = sizeof(int),
6280 .mode = 0644,
6281 .proc_handler = proc_dointvec,
6282 },
6283 {
6284 .procname = "stable_secret",
6285 .data = &ipv6_devconf.stable_secret,
6286 .maxlen = IPV6_MAX_STRLEN,
6287 .mode = 0600,
6288 .proc_handler = addrconf_sysctl_stable_secret,
6289 },
6290 {
6291 .procname = "use_oif_addrs_only",
6292 .data = &ipv6_devconf.use_oif_addrs_only,
6293 .maxlen = sizeof(int),
6294 .mode = 0644,
6295 .proc_handler = proc_dointvec,
6296 },
6297 {
6298 .procname = "ignore_routes_with_linkdown",
6299 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6300 .maxlen = sizeof(int),
6301 .mode = 0644,
6302 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6303 },
6304 {
6305 .procname = "drop_unicast_in_l2_multicast",
6306 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6307 .maxlen = sizeof(int),
6308 .mode = 0644,
6309 .proc_handler = proc_dointvec,
6310 },
6311 {
6312 .procname = "drop_unsolicited_na",
6313 .data = &ipv6_devconf.drop_unsolicited_na,
6314 .maxlen = sizeof(int),
6315 .mode = 0644,
6316 .proc_handler = proc_dointvec,
6317 },
6318 {
6319 .procname = "keep_addr_on_down",
6320 .data = &ipv6_devconf.keep_addr_on_down,
6321 .maxlen = sizeof(int),
6322 .mode = 0644,
6323 .proc_handler = proc_dointvec,
6324
6325 },
1ababeba
DL		 6326 {
6327 .procname = "seg6_enabled",
6328 .data = &ipv6_devconf.seg6_enabled,
6329 .maxlen = sizeof(int),
6330 .mode = 0644,
6331 .proc_handler = proc_dointvec,
6332 },
bf355b8d
DL		 6333#ifdef CONFIG_IPV6_SEG6_HMAC
6334 {
6335 .procname = "seg6_require_hmac",
6336 .data = &ipv6_devconf.seg6_require_hmac,
6337 .maxlen = sizeof(int),
6338 .mode = 0644,
6339 .proc_handler = proc_dointvec,
6340 },
6341#endif
adc176c5
EN		 6342 {
6343 .procname = "enhanced_dad",
6344 .data = &ipv6_devconf.enhanced_dad,
6345 .maxlen = sizeof(int),
6346 .mode = 0644,
6347 .proc_handler = proc_dointvec,
6348 },
d35a00b8
FJ		 6349 {
6350 .procname = "addr_gen_mode",
6351 .data = &ipv6_devconf.addr_gen_mode,
6352 .maxlen = sizeof(int),
6353 .mode = 0644,
6354 .proc_handler = addrconf_sysctl_addr_gen_mode,
6355 },
df789fe7
DF		 6356 {
6357 .procname = "disable_policy",
6358 .data = &ipv6_devconf.disable_policy,
6359 .maxlen = sizeof(int),
6360 .mode = 0644,
6361 .proc_handler = addrconf_sysctl_disable_policy,
6362 },
5df1f77f
KK		 6363 {
6364 /* sentinel */
6365 }
1da177e4
LT		 6366};
6367
bff16c2f 6368static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 6369 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4 6370{
29c994e3 6371 int i, ifindex;
607ea7cd 6372 struct ctl_table *table;
6105e293 6373 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 6374
607ea7cd
KK		 6375 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6376 if (!table)
f68635e6
PE		 6377 goto out;
6378
607ea7cd
KK		 6379 for (i = 0; table[i].data; i++) {
6380 table[i].data += (char *)p - (char *)&ipv6_devconf;
cb9e684e
MŻ		 6381 /* If one of these is already set, then it is not safe to
6382 * overwrite either of them: this makes proc_dointvec_minmax
6383 * usable.
6384 */
6385 if (!table[i].extra1 && !table[i].extra2) {
6386 table[i].extra1 = idev; /* embedded; no ref */
6387 table[i].extra2 = net;
6388 }
1da177e4 6389 }
1da177e4 6390
6105e293 6391 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 6392
607ea7cd
KK		 6393 p->sysctl_header = register_net_sysctl(net, path, table);
6394 if (!p->sysctl_header)
6105e293 6395 goto free;
f68635e6 6396
29c994e3
ND		 6397 if (!strcmp(dev_name, "all"))
6398 ifindex = NETCONFA_IFINDEX_ALL;
6399 else if (!strcmp(dev_name, "default"))
6400 ifindex = NETCONFA_IFINDEX_DEFAULT;
6401 else
6402 ifindex = idev->dev->ifindex;
85b3daad
DA		 6403 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6404 ifindex, p);
95897312 6405 return 0;
1da177e4 6406
f68635e6 6407free:
607ea7cd 6408 kfree(table);
f68635e6 6409out:
95897312 6410 return -ENOBUFS;
1da177e4
LT		 6411}
6412
23452170
DA		 6413static void __addrconf_sysctl_unregister(struct net *net,
6414 struct ipv6_devconf *p, int ifindex)
408c4768 6415{
607ea7cd 6416 struct ctl_table *table;
408c4768 6417
607ea7cd 6418 if (!p->sysctl_header)
408c4768
PE		 6419 return;
6420
607ea7cd
KK		 6421 table = p->sysctl_header->ctl_table_arg;
6422 unregister_net_sysctl_table(p->sysctl_header);
6423 p->sysctl_header = NULL;
6424 kfree(table);
23452170
DA		 6425
6426 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
408c4768
PE		 6427}
6428
a317a2f1 6429static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 6430{
a317a2f1
WC		 6431 int err;
6432
6433 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6434 return -EINVAL;
6435
6436 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6437 &ndisc_ifinfo_sysctl_change);
6438 if (err)
6439 return err;
6440 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6441 idev, &idev->cnf);
6442 if (err)
6443 neigh_sysctl_unregister(idev->nd_parms);
6444
6445 return err;
f52295a9
PE		 6446}
6447
408c4768 6448static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 6449{
23452170
DA		 6450 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6451 idev->dev->ifindex);
408c4768 6452 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 6453}
6454
6455
6456#endif
6457
2c8c1e72 6458static int __net_init addrconf_init_net(struct net *net)
e0da5a48 6459{
a79ca223 6460 int err = -ENOMEM;
e0da5a48
PE		 6461 struct ipv6_devconf *all, *dflt;
6462
a79ca223 6463 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 6464 if (!all)
a79ca223 6465 goto err_alloc_all;
e0da5a48 6466
a79ca223 6467 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 6468 if (!dflt)
a79ca223 6469 goto err_alloc_dflt;
e0da5a48 6470
a79ca223
HZ		 6471 /* these will be inherited by all namespaces */
6472 dflt->autoconf = ipv6_defaults.autoconf;
6473 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 6474
3d1bec99
HFS		 6475 dflt->stable_secret.initialized = false;
6476 all->stable_secret.initialized = false;
6477
e0da5a48
PE		 6478 net->ipv6.devconf_all = all;
6479 net->ipv6.devconf_dflt = dflt;
6480
6481#ifdef CONFIG_SYSCTL
f8572d8f 6482 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 6483 if (err < 0)
6484 goto err_reg_all;
6485
f8572d8f 6486 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 6487 if (err < 0)
6488 goto err_reg_dflt;
6489#endif
6490 return 0;
6491
6492#ifdef CONFIG_SYSCTL
6493err_reg_dflt:
23452170 6494 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
e0da5a48
PE		 6495err_reg_all:
6496 kfree(dflt);
6497#endif
6498err_alloc_dflt:
6499 kfree(all);
6500err_alloc_all:
6501 return err;
6502}
6503
2c8c1e72 6504static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 6505{
6506#ifdef CONFIG_SYSCTL
23452170
DA		 6507 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6508 NETCONFA_IFINDEX_DEFAULT);
6509 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6510 NETCONFA_IFINDEX_ALL);
e0da5a48 6511#endif
73cf0e92 6512 kfree(net->ipv6.devconf_dflt);
6513 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 6514}
6515
6516static struct pernet_operations addrconf_ops = {
6517 .init = addrconf_init_net,
6518 .exit = addrconf_exit_net,
6519};
6520
207895fd 6521static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 6522 .family = AF_INET6,
6523 .fill_link_af = inet6_fill_link_af,
6524 .get_link_af_size = inet6_get_link_af_size,
11b1f828 6525 .validate_link_af = inet6_validate_link_af,
f53adae4 6526 .set_link_af = inet6_set_link_af,
b382b191
TG		 6527};
6528
1da177e4
LT		 6529/*
6530 * Init / cleanup code
6531 */
6532
6533int __init addrconf_init(void)
6534{
a317a2f1 6535 struct inet6_dev *idev;
c2e21293 6536 int i, err;
2a8cc6c8 6537
e21e8467
SH		 6538 err = ipv6_addr_label_init();
6539 if (err < 0) {
f3213831
JP		 6540 pr_crit("%s: cannot initialize default policy table: %d\n",
6541 __func__, err);
2cc6d2bf 6542 goto out;
2a8cc6c8 6543 }
1da177e4 6544
2cc6d2bf
NH		 6545 err = register_pernet_subsys(&addrconf_ops);
6546 if (err < 0)
6547 goto out_addrlabel;
e0da5a48 6548
c15b1cca
HFS		 6549 addrconf_wq = create_workqueue("ipv6_addrconf");
6550 if (!addrconf_wq) {
6551 err = -ENOMEM;
6552 goto out_nowq;
6553 }
6554
1da177e4
LT		 6555 /* The addrconf netdev notifier requires that loopback_dev
6556 * has it's ipv6 private information allocated and setup
6557 * before it can bring up and give link-local addresses
6558 * to other devices which are up.
6559 *
6560 * Unfortunately, loopback_dev is not necessarily the first
6561 * entry in the global dev_base list of net devices. In fact,
6562 * it is likely to be the very last entry on that list.
6563 * So this causes the notifier registry below to try and
6564 * give link-local addresses to all devices besides loopback_dev
6565 * first, then loopback_dev, which cases all the non-loopback_dev
6566 * devices to fail to get a link-local address.
6567 *
6568 * So, as a temporary fix, allocate the ipv6 structure for
6569 * loopback_dev first by hand.
6570 * Longer term, all of the dependencies ipv6 has upon the loopback
6571 * device and it being up should be removed.
6572 */
6573 rtnl_lock();
a317a2f1 6574 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 6575 rtnl_unlock();
a317a2f1
WC		 6576 if (IS_ERR(idev)) {
6577 err = PTR_ERR(idev);
e0da5a48 6578 goto errlo;
a317a2f1 6579 }
1da177e4 6580
2f460933
WC		 6581 ip6_route_init_special_entries();
6582
c2e21293 6583 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6584 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6585
1da177e4
LT		 6586 register_netdevice_notifier(&ipv6_dev_notf);
6587
c15b1cca 6588 addrconf_verify();
c127ea2c 6589
3678a9d8 6590 rtnl_af_register(&inet6_ops);
b382b191 6591
c7ac8679
GR		 6592 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6593 NULL);
c127ea2c
TG		 6594 if (err < 0)
6595 goto errout;
6596
6597 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 6598 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6599 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6600 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6601 inet6_dump_ifaddr, NULL);
6602 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6603 inet6_dump_ifmcaddr, NULL);
6604 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6605 inet6_dump_ifacaddr, NULL);
76f8f6cb 6606 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 6607 inet6_netconf_dump_devconf, NULL);
c127ea2c 6608
2a8cc6c8
YH		 6609 ipv6_addr_label_rtnl_register();
6610
1da177e4 6611 return 0;
c127ea2c 6612errout:
b382b191 6613 rtnl_af_unregister(&inet6_ops);
c127ea2c 6614 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6615errlo:
c15b1cca
HFS		 6616 destroy_workqueue(addrconf_wq);
6617out_nowq:
e0da5a48 6618 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 6619out_addrlabel:
6620 ipv6_addr_label_cleanup();
6621out:
c127ea2c 6622 return err;
1da177e4
LT		 6623}
6624
09f7709f 6625void addrconf_cleanup(void)
1da177e4 6626{
176c39af 6627 struct net_device *dev;
1da177e4
LT		 6628 int i;
6629
6630 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6631 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 6632 ipv6_addr_label_cleanup();
1da177e4
LT		 6633
6634 rtnl_lock();
6635
b382b191
TG		 6636 __rtnl_af_unregister(&inet6_ops);
6637
176c39af
DL		 6638 /* clean dev list */
6639 for_each_netdev(&init_net, dev) {
6640 if (__in6_dev_get(dev) == NULL)
6641 continue;
6642 addrconf_ifdown(dev, 1);
6643 }
6644 addrconf_ifdown(init_net.loopback_dev, 2);
6645
1da177e4
LT		 6646 /*
6647 * Check hash table.
6648 */
5c578aed 6649 spin_lock_bh(&addrconf_hash_lock);
c2e21293 6650 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6651 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 6652 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 6653 cancel_delayed_work(&addr_chk_work);
1da177e4 6654 rtnl_unlock();
c15b1cca
HFS		 6655
6656 destroy_workqueue(addrconf_wq);
1da177e4 6657}
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