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Merge tag 'mac80211-for-davem-2017-05-08' of git://git.kernel.org/pub/scm/linux/kerne...
[mirror_ubuntu-jammy-kernel.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
174cd4b1 46#include <linux/sched/signal.h>
1da177e4
LT		 47#include <linux/socket.h>
48#include <linux/sockios.h>
1da177e4 49#include <linux/net.h>
3d1bec99 50#include <linux/inet.h>
1da177e4
LT		 51#include <linux/in6.h>
52#include <linux/netdevice.h>
1823730f 53#include <linux/if_addr.h>
1da177e4
LT		 54#include <linux/if_arp.h>
55#include <linux/if_arcnet.h>
56#include <linux/if_infiniband.h>
57#include <linux/route.h>
58#include <linux/inetdevice.h>
59#include <linux/init.h>
5a0e3ad6 60#include <linux/slab.h>
1da177e4
LT		 61#ifdef CONFIG_SYSCTL
62#include <linux/sysctl.h>
63#endif
4fc268d2 64#include <linux/capability.h>
1da177e4
LT		 65#include <linux/delay.h>
66#include <linux/notifier.h>
543537bd 67#include <linux/string.h>
ddbe5032 68#include <linux/hash.h>
1da177e4 69
457c4cbc 70#include <net/net_namespace.h>
1da177e4
LT		 71#include <net/sock.h>
72#include <net/snmp.h>
73
5241c2d7 74#include <net/6lowpan.h>
cb6bf355 75#include <net/firewire.h>
1da177e4
LT		 76#include <net/ipv6.h>
77#include <net/protocol.h>
78#include <net/ndisc.h>
79#include <net/ip6_route.h>
80#include <net/addrconf.h>
81#include <net/tcp.h>
82#include <net/ip.h>
5d620266 83#include <net/netlink.h>
f24e3d65 84#include <net/pkt_sched.h>
ca254490 85#include <net/l3mdev.h>
1da177e4
LT		 86#include <linux/if_tunnel.h>
87#include <linux/rtnetlink.h>
f3a1bfb1 88#include <linux/netconf.h>
1da177e4 89#include <linux/random.h>
e21e8467 90#include <linux/uaccess.h>
7f7d9a6b 91#include <asm/unaligned.h>
1da177e4
LT		 92
93#include <linux/proc_fs.h>
94#include <linux/seq_file.h>
bc3b2d7f 95#include <linux/export.h>
1da177e4
LT		 96
97/* Set to 3 to get tracing... */
98#define ACONF_DEBUG 2
99
100#if ACONF_DEBUG >= 3
ba3542e1 101#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
1da177e4 102#else
ba3542e1 103#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
1da177e4
LT		 104#endif
105
106#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e 107
3d1bec99
HFS		 108#define IPV6_MAX_STRLEN \
109 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
110
18a31e1e
TG		 111static inline u32 cstamp_delta(unsigned long cstamp)
112{
113 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
114}
1da177e4 115
bd11f074
MŻ		 116static inline s32 rfc3315_s14_backoff_init(s32 irt)
117{
118 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
119 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
120 do_div(tmp, 1000000);
121 return (s32)tmp;
122}
123
124static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
125{
126 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
127 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
128 do_div(tmp, 1000000);
129 if ((s32)tmp > mrt) {
130 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
131 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
132 do_div(tmp, 1000000);
133 }
134 return (s32)tmp;
135}
136
1da177e4 137#ifdef CONFIG_SYSCTL
a317a2f1 138static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 139static void addrconf_sysctl_unregister(struct inet6_dev *idev);
140#else
a317a2f1 141static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 142{
a317a2f1 143 return 0;
408c4768
PE		 144}
145
146static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
147{
148}
1da177e4
LT		 149#endif
150
9d6280da
JB		 151static void ipv6_regen_rndid(struct inet6_dev *idev);
152static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 153
1b34be74 154static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4 155static int ipv6_count_addresses(struct inet6_dev *idev);
622c81d5
HFS		 156static int ipv6_generate_stable_address(struct in6_addr *addr,
157 u8 dad_count,
158 const struct inet6_dev *idev);
1da177e4
LT		 159
160/*
161 * Configured unicast address hash table
162 */
c2e21293 163static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 164static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 165
c15b1cca
HFS		 166static void addrconf_verify(void);
167static void addrconf_verify_rtnl(void);
168static void addrconf_verify_work(struct work_struct *);
1da177e4 169
c15b1cca
HFS		 170static struct workqueue_struct *addrconf_wq;
171static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 172
173static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
174static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
175
93d9b7d7
JP		 176static void addrconf_type_change(struct net_device *dev,
177 unsigned long event);
1da177e4
LT		 178static int addrconf_ifdown(struct net_device *dev, int how);
179
21caa662
RK		 180static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
181 int plen,
182 const struct net_device *dev,
183 u32 flags, u32 noflags);
184
cf22f9a2 185static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 186static void addrconf_dad_work(struct work_struct *w);
764d3be6 187static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id);
c5e33bdd 188static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 189static void addrconf_rs_timer(unsigned long data);
190static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
191static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
192
1ab1457c 193static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 194 struct prefix_info *pinfo);
3e81c6da
DM		 195static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
196 struct net_device *dev);
1da177e4 197
888c848e 198static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 199 .forwarding = 0,
200 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
201 .mtu6 = IPV6_MIN_MTU,
202 .accept_ra = 1,
203 .accept_redirects = 1,
204 .autoconf = 1,
205 .force_mld_version = 0,
fc4eba58
HFS		 206 .mldv1_unsolicited_report_interval = 10 * HZ,
207 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 208 .dad_transmits = 1,
209 .rtr_solicits = MAX_RTR_SOLICITATIONS,
210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 211 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 212 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 213 .use_tempaddr = 0,
1da177e4
LT		 214 .temp_valid_lft = TEMP_VALID_LIFETIME,
215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
216 .regen_max_retry = REGEN_MAX_RETRY,
217 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 218 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 219 .accept_ra_defrtr = 1,
d9333196 220 .accept_ra_from_local = 0,
8013d1d7 221 .accept_ra_min_hop_limit= 1,
c4fd30eb 222 .accept_ra_pinfo = 1,
930d6ff2
YH		 223#ifdef CONFIG_IPV6_ROUTER_PREF
224 .accept_ra_rtr_pref = 1,
52e16356 225 .rtr_probe_interval = 60 * HZ,
09c884d4 226#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 227 .accept_ra_rt_info_min_plen = 0,
09c884d4
YH		 228 .accept_ra_rt_info_max_plen = 0,
229#endif
930d6ff2 230#endif
fbea49e1 231 .proxy_ndp = 0,
0bcbc926 232 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 233 .disable_ipv6 = 0,
1b34be74 234 .accept_dad = 1,
b800c3b9 235 .suppress_frag_ndisc = 1,
c2943f14 236 .accept_ra_mtu = 1,
3d1bec99
HFS		 237 .stable_secret = {
238 .initialized = false,
3985e8a3
EK		 239 },
240 .use_oif_addrs_only = 0,
35103d11 241 .ignore_routes_with_linkdown = 0,
f1705ec1 242 .keep_addr_on_down = 0,
1ababeba 243 .seg6_enabled = 0,
bf355b8d
DL		 244#ifdef CONFIG_IPV6_SEG6_HMAC
245 .seg6_require_hmac = 0,
246#endif
adc176c5 247 .enhanced_dad = 1,
d35a00b8 248 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
df789fe7 249 .disable_policy = 0,
1da177e4
LT		 250};
251
ab32ea5d 252static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 253 .forwarding = 0,
254 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
255 .mtu6 = IPV6_MIN_MTU,
256 .accept_ra = 1,
257 .accept_redirects = 1,
258 .autoconf = 1,
fc4eba58
HFS		 259 .force_mld_version = 0,
260 .mldv1_unsolicited_report_interval = 10 * HZ,
261 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 262 .dad_transmits = 1,
263 .rtr_solicits = MAX_RTR_SOLICITATIONS,
264 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 265 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 266 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 267 .use_tempaddr = 0,
268 .temp_valid_lft = TEMP_VALID_LIFETIME,
269 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
270 .regen_max_retry = REGEN_MAX_RETRY,
271 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 272 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 273 .accept_ra_defrtr = 1,
d9333196 274 .accept_ra_from_local = 0,
8013d1d7 275 .accept_ra_min_hop_limit= 1,
c4fd30eb 276 .accept_ra_pinfo = 1,
930d6ff2
YH		 277#ifdef CONFIG_IPV6_ROUTER_PREF
278 .accept_ra_rtr_pref = 1,
52e16356 279 .rtr_probe_interval = 60 * HZ,
09c884d4 280#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 281 .accept_ra_rt_info_min_plen = 0,
09c884d4
YH		 282 .accept_ra_rt_info_max_plen = 0,
283#endif
930d6ff2 284#endif
fbea49e1 285 .proxy_ndp = 0,
0bcbc926 286 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 287 .disable_ipv6 = 0,
1b34be74 288 .accept_dad = 1,
b800c3b9 289 .suppress_frag_ndisc = 1,
c2943f14 290 .accept_ra_mtu = 1,
3d1bec99
HFS		 291 .stable_secret = {
292 .initialized = false,
293 },
3985e8a3 294 .use_oif_addrs_only = 0,
35103d11 295 .ignore_routes_with_linkdown = 0,
f1705ec1 296 .keep_addr_on_down = 0,
1ababeba 297 .seg6_enabled = 0,
bf355b8d
DL		 298#ifdef CONFIG_IPV6_SEG6_HMAC
299 .seg6_require_hmac = 0,
300#endif
adc176c5 301 .enhanced_dad = 1,
d35a00b8 302 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
df789fe7 303 .disable_policy = 0,
1da177e4
LT		 304};
305
f24e3d65 306/* Check if a valid qdisc is available */
05297949 307static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 308{
05297949 309 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 310}
311
b7b1bfce 312static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 313{
b7b1bfce
HFS		 314 if (del_timer(&idev->rs_timer))
315 __in6_dev_put(idev);
316}
317
c15b1cca 318static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 319{
c15b1cca 320 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 321 __in6_ifa_put(ifp);
322}
323
b7b1bfce
HFS		 324static void addrconf_mod_rs_timer(struct inet6_dev *idev,
325 unsigned long when)
326{
327 if (!timer_pending(&idev->rs_timer))
328 in6_dev_hold(idev);
329 mod_timer(&idev->rs_timer, jiffies + when);
330}
1da177e4 331
c15b1cca
HFS		 332static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
333 unsigned long delay)
1da177e4 334{
c15b1cca 335 if (!delayed_work_pending(&ifp->dad_work))
1da177e4 336 in6_ifa_hold(ifp);
c15b1cca 337 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
1da177e4
LT		 338}
339
7f7d9a6b
HX		 340static int snmp6_alloc_dev(struct inet6_dev *idev)
341{
827da44c
JS		 342 int i;
343
698365fa
WC		 344 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
345 if (!idev->stats.ipv6)
7f7d9a6b 346 goto err_ip;
827da44c
JS		 347
348 for_each_possible_cpu(i) {
349 struct ipstats_mib *addrconf_stats;
698365fa 350 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 351 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 352 }
353
354
be281e55
ED		 355 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
356 GFP_KERNEL);
357 if (!idev->stats.icmpv6dev)
7f7d9a6b 358 goto err_icmp;
be281e55
ED		 359 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
360 GFP_KERNEL);
361 if (!idev->stats.icmpv6msgdev)
14878f75 362 goto err_icmpmsg;
7f7d9a6b
HX		 363
364 return 0;
365
14878f75 366err_icmpmsg:
be281e55 367 kfree(idev->stats.icmpv6dev);
7f7d9a6b 368err_icmp:
698365fa 369 free_percpu(idev->stats.ipv6);
7f7d9a6b 370err_ip:
aaf70ec7 371 return -ENOMEM;
7f7d9a6b
HX		 372}
373
8e5e8f30 374static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 375{
376 struct inet6_dev *ndev;
a317a2f1 377 int err = -ENOMEM;
1da177e4
LT		 378
379 ASSERT_RTNL();
380
381 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 382 return ERR_PTR(-EINVAL);
1da177e4 383
1ab1457c 384 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
63159f29 385 if (!ndev)
a317a2f1 386 return ERR_PTR(err);
322f74a4
IO		 387
388 rwlock_init(&ndev->lock);
389 ndev->dev = dev;
502a2ffd 390 INIT_LIST_HEAD(&ndev->addr_list);
b7b1bfce
HFS		 391 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
392 (unsigned long)ndev);
c346dca1 393 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
9b29c696
HFS		 394
395 if (ndev->cnf.stable_secret.initialized)
d35a00b8 396 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
9b29c696 397 else
d35a00b8 398 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode;
9b29c696 399
322f74a4 400 ndev->cnf.mtu6 = dev->mtu;
322f74a4 401 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
63159f29 402 if (!ndev->nd_parms) {
322f74a4 403 kfree(ndev);
a317a2f1 404 return ERR_PTR(err);
322f74a4 405 }
0187bdfb
BH		 406 if (ndev->cnf.forwarding)
407 dev_disable_lro(dev);
322f74a4
IO		 408 /* We refer to the device */
409 dev_hold(dev);
1da177e4 410
322f74a4 411 if (snmp6_alloc_dev(ndev) < 0) {
ba3542e1 412 ADBG(KERN_WARNING
f3213831 413 "%s: cannot allocate memory for statistics; dev=%s.\n",
ba3542e1 414 __func__, dev->name);
322f74a4 415 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 416 dev_put(dev);
417 kfree(ndev);
a317a2f1 418 return ERR_PTR(err);
322f74a4 419 }
1da177e4 420
322f74a4 421 if (snmp6_register_dev(ndev) < 0) {
ba3542e1 422 ADBG(KERN_WARNING
f3213831 423 "%s: cannot create /proc/net/dev_snmp6/%s\n",
ba3542e1 424 __func__, dev->name);
a317a2f1 425 goto err_release;
322f74a4
IO		 426 }
427
9d6280da 428 /* One reference from device. */
322f74a4 429 in6_dev_hold(ndev);
1da177e4 430
1b34be74
YH		 431 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
432 ndev->cnf.accept_dad = -1;
433
07a93626 434#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 435 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 436 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 437 ndev->cnf.rtr_solicits = 0;
438 }
439#endif
440
372e6c8f 441 INIT_LIST_HEAD(&ndev->tempaddr_list);
76506a98 442 ndev->desync_factor = U32_MAX;
322f74a4
IO		 443 if ((dev->flags&IFF_LOOPBACK) ||
444 dev->type == ARPHRD_TUNNEL ||
9625ed72 445 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 446 dev->type == ARPHRD_SIT ||
0be669bb 447 dev->type == ARPHRD_NONE) {
322f74a4 448 ndev->cnf.use_tempaddr = -1;
9d6280da
JB		 449 } else
450 ipv6_regen_rndid(ndev);
5d9efa7e 451
914faa14 452 ndev->token = in6addr_any;
1da177e4 453
f24e3d65 454 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 455 ndev->if_flags |= IF_READY;
456
322f74a4
IO		 457 ipv6_mc_init_dev(ndev);
458 ndev->tstamp = jiffies;
a317a2f1
WC		 459 err = addrconf_sysctl_register(ndev);
460 if (err) {
461 ipv6_mc_destroy_dev(ndev);
2a189f9e 462 snmp6_unregister_dev(ndev);
a317a2f1
WC		 463 goto err_release;
464 }
30c4cf57 465 /* protected by rtnl_lock */
cf778b00 466 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc 467
2c5e8933
HFS		 468 /* Join interface-local all-node multicast group */
469 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
470
d88ae4cc 471 /* Join all-node multicast group */
f3ee4010 472 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 473
d6ddef9e 474 /* Join all-router multicast group if forwarding is set */
8b2aaede 475 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 476 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
477
1da177e4 478 return ndev;
a317a2f1
WC		 479
480err_release:
481 neigh_parms_release(&nd_tbl, ndev->nd_parms);
482 ndev->dead = 1;
483 in6_dev_finish_destroy(ndev);
484 return ERR_PTR(err);
1da177e4
LT		 485}
486
8e5e8f30 487static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 488{
489 struct inet6_dev *idev;
490
491 ASSERT_RTNL();
492
e21e8467
SH		 493 idev = __in6_dev_get(dev);
494 if (!idev) {
495 idev = ipv6_add_dev(dev);
a317a2f1 496 if (IS_ERR(idev))
1da177e4
LT		 497 return NULL;
498 }
c5e33bdd 499
1da177e4
LT		 500 if (dev->flags&IFF_UP)
501 ipv6_mc_up(idev);
502 return idev;
503}
504
f3a1bfb1
ND		 505static int inet6_netconf_msgsize_devconf(int type)
506{
507 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
508 + nla_total_size(4); /* NETCONFA_IFINDEX */
136ba622 509 bool all = false;
f3a1bfb1 510
136ba622
ZS		 511 if (type == NETCONFA_ALL)
512 all = true;
513
514 if (all || type == NETCONFA_FORWARDING)
f3a1bfb1 515 size += nla_total_size(4);
b1afce95 516#ifdef CONFIG_IPV6_MROUTE
136ba622 517 if (all || type == NETCONFA_MC_FORWARDING)
d67b8c61 518 size += nla_total_size(4);
b1afce95 519#endif
136ba622 520 if (all || type == NETCONFA_PROXY_NEIGH)
c92d5491 521 size += nla_total_size(4);
f3a1bfb1 522
136ba622 523 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
35103d11
AG		 524 size += nla_total_size(4);
525
f3a1bfb1
ND		 526 return size;
527}
528
529static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
530 struct ipv6_devconf *devconf, u32 portid,
531 u32 seq, int event, unsigned int flags,
532 int type)
533{
534 struct nlmsghdr *nlh;
535 struct netconfmsg *ncm;
136ba622 536 bool all = false;
f3a1bfb1
ND		 537
538 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
539 flags);
63159f29 540 if (!nlh)
f3a1bfb1
ND		 541 return -EMSGSIZE;
542
136ba622
ZS		 543 if (type == NETCONFA_ALL)
544 all = true;
545
f3a1bfb1
ND		 546 ncm = nlmsg_data(nlh);
547 ncm->ncm_family = AF_INET6;
548
549 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
550 goto nla_put_failure;
551
23452170
DA		 552 if (!devconf)
553 goto out;
554
136ba622 555 if ((all || type == NETCONFA_FORWARDING) &&
f3a1bfb1
ND		 556 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
557 goto nla_put_failure;
b1afce95 558#ifdef CONFIG_IPV6_MROUTE
136ba622 559 if ((all || type == NETCONFA_MC_FORWARDING) &&
d67b8c61
ND		 560 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
561 devconf->mc_forwarding) < 0)
562 goto nla_put_failure;
b1afce95 563#endif
136ba622 564 if ((all || type == NETCONFA_PROXY_NEIGH) &&
c92d5491 565 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
566 goto nla_put_failure;
567
136ba622 568 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
35103d11
AG		 569 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
570 devconf->ignore_routes_with_linkdown) < 0)
571 goto nla_put_failure;
572
23452170 573out:
053c095a
JB		 574 nlmsg_end(skb, nlh);
575 return 0;
f3a1bfb1
ND		 576
577nla_put_failure:
578 nlmsg_cancel(skb, nlh);
579 return -EMSGSIZE;
580}
581
85b3daad
DA		 582void inet6_netconf_notify_devconf(struct net *net, int event, int type,
583 int ifindex, struct ipv6_devconf *devconf)
f3a1bfb1
ND		 584{
585 struct sk_buff *skb;
586 int err = -ENOBUFS;
587
927265bc 588 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
63159f29 589 if (!skb)
f3a1bfb1
ND		 590 goto errout;
591
592 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
85b3daad 593 event, 0, type);
f3a1bfb1
ND		 594 if (err < 0) {
595 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
596 WARN_ON(err == -EMSGSIZE);
597 kfree_skb(skb);
598 goto errout;
599 }
927265bc 600 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
f3a1bfb1
ND		 601 return;
602errout:
bd779028 603 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
f3a1bfb1
ND		 604}
605
76f8f6cb
ND		 606static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
607 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
608 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
c92d5491 609 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
35103d11 610 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
76f8f6cb
ND		 611};
612
613static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
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;
1025 ifa->flags = flags | IFA_F_TENTATIVE;
8a226b2c
JB		 1026 ifa->valid_lft = valid_lft;
1027 ifa->prefered_lft = prefered_lft;
1da177e4 1028 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 1029 ifa->tokenized = false;
1da177e4 1030
57f5f544
KF		 1031 ifa->rt = rt;
1032
1da177e4
LT		 1033 ifa->idev = idev;
1034 in6_dev_hold(idev);
1035 /* For caller */
1036 in6_ifa_hold(ifa);
1037
1038 /* Add to big hash table */
ddbe5032 1039 hash = inet6_addr_hash(addr);
1da177e4 1040
5c578aed 1041 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 1042 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 1043
1044 write_lock(&idev->lock);
1045 /* Add to inet6_dev unicast addr list. */
e55ffac6 1046 ipv6_link_dev_addr(idev, ifa);
1da177e4 1047
1da177e4 1048 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 1049 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 1050 in6_ifa_hold(ifa);
1051 }
1da177e4 1052
1da177e4
LT		 1053 in6_ifa_hold(ifa);
1054 write_unlock(&idev->lock);
1055out2:
8814c4b5 1056 rcu_read_unlock_bh();
1da177e4 1057
fd92833a 1058 if (likely(err == 0))
f88c91dd 1059 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 1060 else {
1061 kfree(ifa);
1062 ifa = ERR_PTR(err);
1063 }
1064
1065 return ifa;
1066out:
5c578aed 1067 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 1068 goto out2;
1069}
1070
5b84efec
TH		 1071enum cleanup_prefix_rt_t {
1072 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1073 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1074 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1075};
1076
1077/*
1078 * Check, whether the prefix for ifp would still need a prefix route
1079 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1080 * constants.
1081 *
1082 * 1) we don't purge prefix if address was not permanent.
1083 * prefix is managed by its own lifetime.
1084 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1085 * 3) if there are no addresses, delete prefix.
1086 * 4) if there are still other permanent address(es),
1087 * corresponding prefix is still permanent.
1088 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1089 * don't purge the prefix, assume user space is managing it.
1090 * 6) otherwise, update prefix lifetime to the
1091 * longest valid lifetime among the corresponding
1092 * addresses on the device.
1093 * Note: subsequent RA will update lifetime.
1094 **/
1095static enum cleanup_prefix_rt_t
1096check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1097{
1098 struct inet6_ifaddr *ifa;
1099 struct inet6_dev *idev = ifp->idev;
1100 unsigned long lifetime;
1101 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1102
1103 *expires = jiffies;
1104
1105 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1106 if (ifa == ifp)
1107 continue;
1108 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1109 ifp->prefix_len))
1110 continue;
1111 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1112 return CLEANUP_PREFIX_RT_NOP;
1113
1114 action = CLEANUP_PREFIX_RT_EXPIRE;
1115
1116 spin_lock(&ifa->lock);
1117
1118 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1119 /*
1120 * Note: Because this address is
1121 * not permanent, lifetime <
1122 * LONG_MAX / HZ here.
1123 */
1124 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1125 *expires = ifa->tstamp + lifetime * HZ;
1126 spin_unlock(&ifa->lock);
1127 }
1128
1129 return action;
1130}
1131
1132static void
1133cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1134{
1135 struct rt6_info *rt;
1136
1137 rt = addrconf_get_prefix_route(&ifp->addr,
1138 ifp->prefix_len,
1139 ifp->idev->dev,
1140 0, RTF_GATEWAY | RTF_DEFAULT);
1141 if (rt) {
1142 if (del_rt)
1143 ip6_del_rt(rt);
1144 else {
1145 if (!(rt->rt6i_flags & RTF_EXPIRES))
1146 rt6_set_expires(rt, expires);
1147 ip6_rt_put(rt);
1148 }
1149 }
1150}
1151
1152
1da177e4
LT		 1153/* This function wants to get referenced ifp and releases it before return */
1154
1155static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1156{
4c5ff6a6 1157 int state;
5b84efec
TH		 1158 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1159 unsigned long expires;
1da177e4 1160
c15b1cca
HFS		 1161 ASSERT_RTNL();
1162
8e8e676d 1163 spin_lock_bh(&ifp->lock);
4c5ff6a6 1164 state = ifp->state;
e9d3e084 1165 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1166 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1167
1168 if (state == INET6_IFADDR_STATE_DEAD)
1169 goto out;
1da177e4 1170
5c578aed 1171 spin_lock_bh(&addrconf_hash_lock);
1172 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1173 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1174
5b84efec 1175 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1176
1da177e4 1177 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1178 list_del(&ifp->tmp_list);
1179 if (ifp->ifpub) {
1180 in6_ifa_put(ifp->ifpub);
1181 ifp->ifpub = NULL;
1da177e4 1182 }
372e6c8f 1183 __in6_ifa_put(ifp);
1da177e4 1184 }
1da177e4 1185
5b84efec
TH		 1186 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1187 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1188
5b84efec
TH		 1189 list_del_init(&ifp->if_list);
1190 __in6_ifa_put(ifp);
1191
1192 write_unlock_bh(&ifp->idev->lock);
1da177e4 1193
c15b1cca 1194 addrconf_del_dad_work(ifp);
b2238566 1195
1da177e4
LT		 1196 ipv6_ifa_notify(RTM_DELADDR, ifp);
1197
f88c91dd 1198 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1199
5b84efec
TH		 1200 if (action != CLEANUP_PREFIX_RT_NOP) {
1201 cleanup_prefix_route(ifp, expires,
1202 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1203 }
1204
c3968a85
DW		 1205 /* clean up prefsrc entries */
1206 rt6_remove_prefsrc(ifp);
4c5ff6a6 1207out:
1da177e4
LT		 1208 in6_ifa_put(ifp);
1209}
1210
1da177e4
LT		 1211static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1212{
1213 struct inet6_dev *idev = ifp->idev;
1214 struct in6_addr addr, *tmpaddr;
76f793e3 1215 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1216 unsigned long regen_advance;
1da177e4
LT		 1217 int tmp_plen;
1218 int ret = 0;
95c385b4 1219 u32 addr_flags;
76f793e3 1220 unsigned long now = jiffies;
76506a98 1221 long max_desync_factor;
7aa8e63f 1222 s32 cnf_temp_preferred_lft;
1da177e4 1223
53bd6749 1224 write_lock_bh(&idev->lock);
1da177e4
LT		 1225 if (ift) {
1226 spin_lock_bh(&ift->lock);
1227 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1228 spin_unlock_bh(&ift->lock);
1229 tmpaddr = &addr;
1230 } else {
1231 tmpaddr = NULL;
1232 }
1233retry:
1234 in6_dev_hold(idev);
1235 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1236 write_unlock_bh(&idev->lock);
f3213831 1237 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1238 in6_dev_put(idev);
1239 ret = -1;
1240 goto out;
1241 }
1242 spin_lock_bh(&ifp->lock);
1243 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1244 idev->cnf.use_tempaddr = -1; /*XXX*/
1245 spin_unlock_bh(&ifp->lock);
53bd6749 1246 write_unlock_bh(&idev->lock);
f3213831
JP		 1247 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1248 __func__);
1da177e4
LT		 1249 in6_dev_put(idev);
1250 ret = -1;
1251 goto out;
1252 }
1253 in6_ifa_hold(ifp);
1254 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
9d6280da 1255 ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1256 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1257 age = (now - ifp->tstamp) / HZ;
76506a98
JB		 1258
1259 regen_advance = idev->cnf.regen_max_retry *
1260 idev->cnf.dad_transmits *
1261 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1262
1263 /* recalculate max_desync_factor each time and update
1264 * idev->desync_factor if it's larger
1265 */
7aa8e63f 1266 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
76506a98
JB		 1267 max_desync_factor = min_t(__u32,
1268 idev->cnf.max_desync_factor,
7aa8e63f 1269 cnf_temp_preferred_lft - regen_advance);
76506a98
JB		 1270
1271 if (unlikely(idev->desync_factor > max_desync_factor)) {
1272 if (max_desync_factor > 0) {
1273 get_random_bytes(&idev->desync_factor,
1274 sizeof(idev->desync_factor));
1275 idev->desync_factor %= max_desync_factor;
1276 } else {
1277 idev->desync_factor = 0;
1278 }
1279 }
1280
1da177e4
LT		 1281 tmp_valid_lft = min_t(__u32,
1282 ifp->valid_lft,
7a876b0e 1283 idev->cnf.temp_valid_lft + age);
7aa8e63f 1284 tmp_prefered_lft = cnf_temp_preferred_lft + age -
76506a98 1285 idev->desync_factor;
76506a98 1286 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1da177e4 1287 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1288 tmp_tstamp = ifp->tstamp;
1289 spin_unlock_bh(&ifp->lock);
1290
53bd6749 1291 write_unlock_bh(&idev->lock);
95c385b4 1292
eac55bf9
BB		 1293 /* A temporary address is created only if this calculated Preferred
1294 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1295 * an implementation must not create a temporary address with a zero
1296 * Preferred Lifetime.
ecab6701
HK		 1297 * Use age calculation as in addrconf_verify to avoid unnecessary
1298 * temporary addresses being generated.
eac55bf9 1299 */
ecab6701
HK		 1300 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1301 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1302 in6_ifa_put(ifp);
1303 in6_dev_put(idev);
1304 ret = -1;
1305 goto out;
1306 }
1307
95c385b4
NH		 1308 addr_flags = IFA_F_TEMPORARY;
1309 /* set in addrconf_prefix_rcv() */
1310 if (ifp->flags & IFA_F_OPTIMISTIC)
1311 addr_flags |= IFA_F_OPTIMISTIC;
1312
4b08a8f1
HFS		 1313 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1314 ipv6_addr_scope(&addr), addr_flags,
1315 tmp_valid_lft, tmp_prefered_lft);
1316 if (IS_ERR(ift)) {
1da177e4
LT		 1317 in6_ifa_put(ifp);
1318 in6_dev_put(idev);
f3213831 1319 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1320 tmpaddr = &addr;
53bd6749 1321 write_lock_bh(&idev->lock);
1da177e4
LT		 1322 goto retry;
1323 }
1324
1325 spin_lock_bh(&ift->lock);
1326 ift->ifpub = ifp;
76f793e3 1327 ift->cstamp = now;
1da177e4
LT		 1328 ift->tstamp = tmp_tstamp;
1329 spin_unlock_bh(&ift->lock);
1330
cf22f9a2 1331 addrconf_dad_start(ift);
1da177e4
LT		 1332 in6_ifa_put(ift);
1333 in6_dev_put(idev);
1334out:
1335 return ret;
1336}
1da177e4
LT		 1337
1338/*
072047e4 1339 * Choose an appropriate source address (RFC3484)
1da177e4 1340 */
a9b05723
YH		 1341enum {
1342 IPV6_SADDR_RULE_INIT = 0,
1343 IPV6_SADDR_RULE_LOCAL,
1344 IPV6_SADDR_RULE_SCOPE,
1345 IPV6_SADDR_RULE_PREFERRED,
1346#ifdef CONFIG_IPV6_MIP6
1347 IPV6_SADDR_RULE_HOA,
1348#endif
1349 IPV6_SADDR_RULE_OIF,
1350 IPV6_SADDR_RULE_LABEL,
a9b05723 1351 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1352 IPV6_SADDR_RULE_ORCHID,
1353 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1354#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1355 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1356#endif
a9b05723
YH		 1357 IPV6_SADDR_RULE_MAX
1358};
1359
072047e4 1360struct ipv6_saddr_score {
a9b05723
YH		 1361 int rule;
1362 int addr_type;
1363 struct inet6_ifaddr *ifa;
1364 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1365 int scopedist;
1366 int matchlen;
072047e4
YH		 1367};
1368
a9b05723 1369struct ipv6_saddr_dst {
9acd9f3a 1370 const struct in6_addr *addr;
a9b05723
YH		 1371 int ifindex;
1372 int scope;
1373 int label;
7cbca67c 1374 unsigned int prefs;
a9b05723 1375};
072047e4 1376
b6f99a21 1377static inline int ipv6_saddr_preferred(int type)
1da177e4 1378{
45bb0060 1379 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1380 return 1;
1381 return 0;
1da177e4
LT		 1382}
1383
7fd2561e
EK		 1384static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1385{
1386#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1387 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1388#else
1389 return false;
1390#endif
1391}
1392
3de23255
BT		 1393static int ipv6_get_saddr_eval(struct net *net,
1394 struct ipv6_saddr_score *score,
a9b05723
YH		 1395 struct ipv6_saddr_dst *dst,
1396 int i)
1397{
1398 int ret;
1399
1400 if (i <= score->rule) {
1401 switch (i) {
1402 case IPV6_SADDR_RULE_SCOPE:
1403 ret = score->scopedist;
1404 break;
1405 case IPV6_SADDR_RULE_PREFIX:
1406 ret = score->matchlen;
1407 break;
1408 default:
1409 ret = !!test_bit(i, score->scorebits);
1410 }
1411 goto out;
1412 }
1413
1414 switch (i) {
1415 case IPV6_SADDR_RULE_INIT:
1416 /* Rule 0: remember if hiscore is not ready yet */
1417 ret = !!score->ifa;
1418 break;
1419 case IPV6_SADDR_RULE_LOCAL:
1420 /* Rule 1: Prefer same address */
1421 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1422 break;
1423 case IPV6_SADDR_RULE_SCOPE:
1424 /* Rule 2: Prefer appropriate scope
1425 *
1426 * ret
1427 * ^
1428 * -1 | d 15
1429 * ---+--+-+---> scope
1430 * |
1431 * | d is scope of the destination.
1432 * B-d | \
1433 * | \ <- smaller scope is better if
db9c7c39 1434 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1435 * | ret = B - scope (-1 <= scope >= d <= 15).
1436 * d-C-1 | /
1437 * |/ <- greater is better
1438 * -C / if scope is not enough for destination.
1439 * /| ret = scope - C (-1 <= d < scope <= 15).
1440 *
1441 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1442 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1443 * Assume B = 0 and we get C > 29.
1444 */
1445 ret = __ipv6_addr_src_scope(score->addr_type);
1446 if (ret >= dst->scope)
1447 ret = -ret;
1448 else
1449 ret -= 128; /* 30 is enough */
1450 score->scopedist = ret;
1451 break;
1452 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1453 {
a9b05723 1454 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1455 u8 avoid = IFA_F_DEPRECATED;
1456
1457 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1458 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1459 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1460 !(score->ifa->flags & avoid);
a9b05723 1461 break;
7fd2561e 1462 }
a9b05723
YH		 1463#ifdef CONFIG_IPV6_MIP6
1464 case IPV6_SADDR_RULE_HOA:
7cbca67c 1465 {
a9b05723 1466 /* Rule 4: Prefer home address */
7cbca67c
YH		 1467 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1468 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1469 break;
7cbca67c 1470 }
a9b05723
YH		 1471#endif
1472 case IPV6_SADDR_RULE_OIF:
1473 /* Rule 5: Prefer outgoing interface */
1474 ret = (!dst->ifindex ||
1475 dst->ifindex == score->ifa->idev->dev->ifindex);
1476 break;
1477 case IPV6_SADDR_RULE_LABEL:
1478 /* Rule 6: Prefer matching label */
3de23255
BT		 1479 ret = ipv6_addr_label(net,
1480 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1481 score->ifa->idev->dev->ifindex) == dst->label;
1482 break;
a9b05723 1483 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1484 {
a9b05723 1485 /* Rule 7: Prefer public address
25985edc 1486 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1487 */
7cbca67c
YH		 1488 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1489 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1490 score->ifa->idev->cnf.use_tempaddr >= 2;
1491 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1492 break;
7cbca67c 1493 }
a9b05723
YH		 1494 case IPV6_SADDR_RULE_ORCHID:
1495 /* Rule 8-: Prefer ORCHID vs ORCHID or
1496 * non-ORCHID vs non-ORCHID
1497 */
1498 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1499 ipv6_addr_orchid(dst->addr));
1500 break;
1501 case IPV6_SADDR_RULE_PREFIX:
1502 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1503 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1504 if (ret > score->ifa->prefix_len)
1505 ret = score->ifa->prefix_len;
1506 score->matchlen = ret;
a9b05723 1507 break;
7fd2561e
EK		 1508#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1509 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1510 /* Optimistic addresses still have lower precedence than other
1511 * preferred addresses.
1512 */
1513 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1514 break;
1515#endif
a9b05723
YH		 1516 default:
1517 ret = 0;
1518 }
1519
1520 if (ret)
1521 __set_bit(i, score->scorebits);
1522 score->rule = i;
1523out:
1524 return ret;
1525}
1526
c0b8da1e
YH		 1527static int __ipv6_dev_get_saddr(struct net *net,
1528 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1529 struct inet6_dev *idev,
1530 struct ipv6_saddr_score *scores,
1531 int hiscore_idx)
9131f3de 1532{
c0b8da1e 1533 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de
YH		 1534
1535 read_lock_bh(&idev->lock);
1536 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1537 int i;
1538
1539 /*
1540 * - Tentative Address (RFC2462 section 5.4)
1541 * - A tentative address is not considered
1542 * "assigned to an interface" in the traditional
1543 * sense, unless it is also flagged as optimistic.
1544 * - Candidate Source Address (section 4)
1545 * - In any case, anycast addresses, multicast
1546 * addresses, and the unspecified address MUST
1547 * NOT be included in a candidate set.
1548 */
1549 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1550 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1551 continue;
1552
1553 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1554
1555 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1556 score->addr_type & IPV6_ADDR_MULTICAST)) {
1557 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1558 idev->dev->name);
1559 continue;
1560 }
1561
1562 score->rule = -1;
1563 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1564
1565 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1566 int minihiscore, miniscore;
1567
1568 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1569 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1570
1571 if (minihiscore > miniscore) {
1572 if (i == IPV6_SADDR_RULE_SCOPE &&
1573 score->scopedist > 0) {
1574 /*
1575 * special case:
1576 * each remaining entry
1577 * has too small (not enough)
1578 * scope, because ifa entries
1579 * are sorted by their scope
1580 * values.
1581 */
1582 goto out;
1583 }
1584 break;
1585 } else if (minihiscore < miniscore) {
1586 if (hiscore->ifa)
1587 in6_ifa_put(hiscore->ifa);
1588
1589 in6_ifa_hold(score->ifa);
1590
1591 swap(hiscore, score);
c0b8da1e 1592 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1593
1594 /* restore our iterator */
1595 score->ifa = hiscore->ifa;
1596
1597 break;
1598 }
1599 }
1600 }
1601out:
1602 read_unlock_bh(&idev->lock);
c0b8da1e 1603 return hiscore_idx;
9131f3de
YH		 1604}
1605
afbac601
DA		 1606static int ipv6_get_saddr_master(struct net *net,
1607 const struct net_device *dst_dev,
1608 const struct net_device *master,
1609 struct ipv6_saddr_dst *dst,
1610 struct ipv6_saddr_score *scores,
1611 int hiscore_idx)
1612{
1613 struct inet6_dev *idev;
1614
1615 idev = __in6_dev_get(dst_dev);
1616 if (idev)
1617 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1618 scores, hiscore_idx);
1619
1620 idev = __in6_dev_get(master);
1621 if (idev)
1622 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1623 scores, hiscore_idx);
1624
1625 return hiscore_idx;
1626}
1627
b3f644fc 1628int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1629 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1630 struct in6_addr *saddr)
1da177e4 1631{
c0b8da1e 1632 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1633 struct ipv6_saddr_dst dst;
9131f3de 1634 struct inet6_dev *idev;
072047e4 1635 struct net_device *dev;
a9b05723 1636 int dst_type;
9131f3de 1637 bool use_oif_addr = false;
c0b8da1e 1638 int hiscore_idx = 0;
1da177e4 1639
a9b05723
YH		 1640 dst_type = __ipv6_addr_type(daddr);
1641 dst.addr = daddr;
1642 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1643 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1644 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1645 dst.prefs = prefs;
a9b05723 1646
c0b8da1e
YH		 1647 scores[hiscore_idx].rule = -1;
1648 scores[hiscore_idx].ifa = NULL;
1da177e4 1649
8814c4b5 1650 rcu_read_lock();
1da177e4 1651
9131f3de
YH		 1652 /* Candidate Source Address (section 4)
1653 * - multicast and link-local destination address,
1654 * the set of candidate source address MUST only
1655 * include addresses assigned to interfaces
1656 * belonging to the same link as the outgoing
1657 * interface.
1658 * (- For site-local destination addresses, the
1659 * set of candidate source addresses MUST only
1660 * include addresses assigned to interfaces
1661 * belonging to the same site as the outgoing
1662 * interface.)
3985e8a3
EK		 1663 * - "It is RECOMMENDED that the candidate source addresses
1664 * be the set of unicast addresses assigned to the
1665 * interface that will be used to send to the destination
1666 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1667 */
1668 if (dst_dev) {
3985e8a3 1669 idev = __in6_dev_get(dst_dev);
9131f3de 1670 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1671 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1672 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1673 use_oif_addr = true;
1674 }
1675 }
a9b05723 1676
9131f3de 1677 if (use_oif_addr) {
c0b8da1e 1678 if (idev)
c15df306 1679 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de 1680 } else {
afbac601
DA		 1681 const struct net_device *master;
1682 int master_idx = 0;
1683
1684 /* if dst_dev exists and is enslaved to an L3 device, then
1685 * prefer addresses from dst_dev and then the master over
1686 * any other enslaved devices in the L3 domain.
1687 */
1688 master = l3mdev_master_dev_rcu(dst_dev);
1689 if (master) {
1690 master_idx = master->ifindex;
1691
1692 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1693 master, &dst,
1694 scores, hiscore_idx);
1695
1696 if (scores[hiscore_idx].ifa)
1697 goto out;
1698 }
1699
9131f3de 1700 for_each_netdev_rcu(net, dev) {
afbac601
DA		 1701 /* only consider addresses on devices in the
1702 * same L3 domain
1703 */
1704 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1705 continue;
9131f3de
YH		 1706 idev = __in6_dev_get(dev);
1707 if (!idev)
072047e4 1708 continue;
c15df306 1709 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1710 }
1711 }
afbac601
DA		 1712
1713out:
8814c4b5 1714 rcu_read_unlock();
1da177e4 1715
c0b8da1e 1716 hiscore = &scores[hiscore_idx];
a9b05723 1717 if (!hiscore->ifa)
072047e4 1718 return -EADDRNOTAVAIL;
1ab1457c 1719
4e3fd7a0 1720 *saddr = hiscore->ifa->addr;
a9b05723 1721 in6_ifa_put(hiscore->ifa);
072047e4 1722 return 0;
1da177e4 1723}
5e5f3f0f 1724EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1725
8965779d 1726int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1727 u32 banned_flags)
b7b1bfce
HFS		 1728{
1729 struct inet6_ifaddr *ifp;
1730 int err = -EADDRNOTAVAIL;
1731
602582ca
HFS		 1732 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1733 if (ifp->scope > IFA_LINK)
1734 break;
b7b1bfce
HFS		 1735 if (ifp->scope == IFA_LINK &&
1736 !(ifp->flags & banned_flags)) {
1737 *addr = ifp->addr;
1738 err = 0;
1739 break;
1740 }
1741 }
1742 return err;
1743}
1744
95c385b4 1745int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1746 u32 banned_flags)
1da177e4
LT		 1747{
1748 struct inet6_dev *idev;
1749 int err = -EADDRNOTAVAIL;
1750
8814c4b5 1751 rcu_read_lock();
e21e8467
SH		 1752 idev = __in6_dev_get(dev);
1753 if (idev) {
1da177e4 1754 read_lock_bh(&idev->lock);
b7b1bfce 1755 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1756 read_unlock_bh(&idev->lock);
1757 }
8814c4b5 1758 rcu_read_unlock();
1da177e4
LT		 1759 return err;
1760}
1761
1762static int ipv6_count_addresses(struct inet6_dev *idev)
1763{
1764 int cnt = 0;
1765 struct inet6_ifaddr *ifp;
1766
1767 read_lock_bh(&idev->lock);
502a2ffd 1768 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1769 cnt++;
1770 read_unlock_bh(&idev->lock);
1771 return cnt;
1772}
1773
b71d1d42 1774int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1775 const struct net_device *dev, int strict)
c58da4c6
EK		 1776{
1777 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1778}
1779EXPORT_SYMBOL(ipv6_chk_addr);
1780
1781int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1782 const struct net_device *dev, int strict,
1783 u32 banned_flags)
1da177e4 1784{
eedf042a 1785 struct inet6_ifaddr *ifp;
ddbe5032 1786 unsigned int hash = inet6_addr_hash(addr);
c58da4c6 1787 u32 ifp_flags;
1da177e4 1788
5c578aed 1789 rcu_read_lock_bh();
b67bfe0d 1790 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1791 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1792 continue;
c58da4c6
EK		 1793 /* Decouple optimistic from tentative for evaluation here.
1794 * Ban optimistic addresses explicitly, when required.
1795 */
1796 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1797 ? (ifp->flags&~IFA_F_TENTATIVE)
1798 : ifp->flags;
1da177e4 1799 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1800 !(ifp_flags&banned_flags) &&
63159f29 1801 (!dev || ifp->idev->dev == dev ||
eedf042a
SH		 1802 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1803 rcu_read_unlock_bh();
1804 return 1;
1da177e4
LT		 1805 }
1806 }
5c578aed 1807
eedf042a
SH		 1808 rcu_read_unlock_bh();
1809 return 0;
1da177e4 1810}
c58da4c6 1811EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1812
3e81c6da
DM		 1813static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1814 struct net_device *dev)
1da177e4 1815{
ddbe5032 1816 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1817 struct inet6_ifaddr *ifp;
1da177e4 1818
b67bfe0d 1819 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1820 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1821 continue;
1da177e4 1822 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1823 if (!dev || ifp->idev->dev == dev)
3e81c6da 1824 return true;
1da177e4
LT		 1825 }
1826 }
3e81c6da 1827 return false;
1da177e4
LT		 1828}
1829
7df37ff3
CB		 1830/* Compares an address/prefix_len with addresses on device @dev.
1831 * If one is found it returns true.
1832 */
1833bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1834 const unsigned int prefix_len, struct net_device *dev)
1835{
1836 struct inet6_dev *idev;
1837 struct inet6_ifaddr *ifa;
1838 bool ret = false;
1839
1840 rcu_read_lock();
1841 idev = __in6_dev_get(dev);
1842 if (idev) {
1843 read_lock_bh(&idev->lock);
1844 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1845 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1846 if (ret)
1847 break;
1848 }
1849 read_unlock_bh(&idev->lock);
1850 }
1851 rcu_read_unlock();
1852
1853 return ret;
1854}
1855EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1856
b71d1d42 1857int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1858{
1859 struct inet6_dev *idev;
1860 struct inet6_ifaddr *ifa;
1861 int onlink;
1862
1863 onlink = 0;
1864 rcu_read_lock();
1865 idev = __in6_dev_get(dev);
1866 if (idev) {
1867 read_lock_bh(&idev->lock);
502a2ffd 1868 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1869 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1870 ifa->prefix_len);
1871 if (onlink)
1872 break;
1873 }
1874 read_unlock_bh(&idev->lock);
1875 }
1876 rcu_read_unlock();
1877 return onlink;
1878}
52eeeb84
YH		 1879EXPORT_SYMBOL(ipv6_chk_prefix);
1880
9acd9f3a 1881struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1882 struct net_device *dev, int strict)
1da177e4 1883{
b79d1d54 1884 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1885 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1886
5c578aed 1887 rcu_read_lock_bh();
b67bfe0d 1888 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1889 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1890 continue;
1da177e4 1891 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1892 if (!dev || ifp->idev->dev == dev ||
1da177e4 1893 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1894 result = ifp;
1da177e4
LT		 1895 in6_ifa_hold(ifp);
1896 break;
1897 }
1898 }
1899 }
5c578aed 1900 rcu_read_unlock_bh();
1da177e4 1901
b79d1d54 1902 return result;
1da177e4
LT		 1903}
1904
1da177e4
LT		 1905/* Gets referenced address, destroys ifaddr */
1906
cc411d0b 1907static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1908{
3d171f39
LR		 1909 if (dad_failed)
1910 ifp->flags |= IFA_F_DADFAILED;
1911
1da177e4
LT		 1912 if (ifp->flags&IFA_F_PERMANENT) {
1913 spin_lock_bh(&ifp->lock);
c15b1cca 1914 addrconf_del_dad_work(ifp);
1da177e4
LT		 1915 ifp->flags |= IFA_F_TENTATIVE;
1916 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1917 if (dad_failed)
1918 ipv6_ifa_notify(0, ifp);
1da177e4 1919 in6_ifa_put(ifp);
1da177e4
LT		 1920 } else if (ifp->flags&IFA_F_TEMPORARY) {
1921 struct inet6_ifaddr *ifpub;
1922 spin_lock_bh(&ifp->lock);
1923 ifpub = ifp->ifpub;
1924 if (ifpub) {
1925 in6_ifa_hold(ifpub);
1926 spin_unlock_bh(&ifp->lock);
1927 ipv6_create_tempaddr(ifpub, ifp);
1928 in6_ifa_put(ifpub);
1929 } else {
1930 spin_unlock_bh(&ifp->lock);
1931 }
1932 ipv6_del_addr(ifp);
c15b1cca 1933 } else {
1da177e4 1934 ipv6_del_addr(ifp);
c15b1cca 1935 }
1da177e4
LT		 1936}
1937
f2344a13
HX		 1938static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1939{
1940 int err = -ENOENT;
1941
8e8e676d 1942 spin_lock_bh(&ifp->lock);
f2344a13
HX		 1943 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1944 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1945 err = 0;
1946 }
8e8e676d 1947 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 1948
1949 return err;
1950}
1951
3c21edbd
YH		 1952void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1953{
1b34be74 1954 struct inet6_dev *idev = ifp->idev;
1855b7c3 1955 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 1956
853dc2e0
UB		 1957 if (addrconf_dad_end(ifp)) {
1958 in6_ifa_put(ifp);
f2344a13 1959 return;
853dc2e0 1960 }
f2344a13 1961
e87cc472
JP		 1962 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1963 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1964
5f40ef77
HFS		 1965 spin_lock_bh(&ifp->lock);
1966
1967 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1968 int scope = ifp->scope;
1969 u32 flags = ifp->flags;
1970 struct in6_addr new_addr;
1971 struct inet6_ifaddr *ifp2;
1972 u32 valid_lft, preferred_lft;
1973 int pfxlen = ifp->prefix_len;
5f40ef77
HFS		 1974 int retries = ifp->stable_privacy_retry + 1;
1975
1855b7c3 1976 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 1977 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1978 ifp->idev->dev->name);
1979 goto errdad;
1980 }
1981
1982 new_addr = ifp->addr;
1983 if (ipv6_generate_stable_address(&new_addr, retries,
1984 idev))
1985 goto errdad;
1986
1987 valid_lft = ifp->valid_lft;
1988 preferred_lft = ifp->prefered_lft;
1989
1990 spin_unlock_bh(&ifp->lock);
1b34be74 1991
5f40ef77
HFS		 1992 if (idev->cnf.max_addresses &&
1993 ipv6_count_addresses(idev) >=
1994 idev->cnf.max_addresses)
1995 goto lock_errdad;
1996
1997 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1998 ifp->idev->dev->name);
1999
2000 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
2001 scope, flags, valid_lft,
2002 preferred_lft);
2003 if (IS_ERR(ifp2))
2004 goto lock_errdad;
2005
2006 spin_lock_bh(&ifp2->lock);
2007 ifp2->stable_privacy_retry = retries;
2008 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2009 spin_unlock_bh(&ifp2->lock);
2010
1855b7c3 2011 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 2012 in6_ifa_put(ifp2);
2013lock_errdad:
2014 spin_lock_bh(&ifp->lock);
1b34be74
YH		 2015 }
2016
5f40ef77 2017errdad:
c15b1cca
HFS		 2018 /* transition from _POSTDAD to _ERRDAD */
2019 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 2020 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 2021
2022 addrconf_mod_dad_work(ifp, 0);
751eb6b6 2023 in6_ifa_put(ifp);
3c21edbd 2024}
1da177e4 2025
a9ed4a29
SD		 2026/* Join to solicited addr multicast group.
2027 * caller must hold RTNL */
b71d1d42 2028void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 2029{
2030 struct in6_addr maddr;
2031
2032 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2033 return;
2034
2035 addrconf_addr_solict_mult(addr, &maddr);
2036 ipv6_dev_mc_inc(dev, &maddr);
2037}
2038
a9ed4a29 2039/* caller must hold RTNL */
b71d1d42 2040void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 2041{
2042 struct in6_addr maddr;
2043
2044 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2045 return;
2046
2047 addrconf_addr_solict_mult(addr, &maddr);
2048 __ipv6_dev_mc_dec(idev, &maddr);
2049}
2050
a9ed4a29 2051/* caller must hold RTNL */
20380731 2052static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2053{
2054 struct in6_addr addr;
c15b1cca 2055
88ad3149 2056 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 2057 return;
1da177e4
LT		 2058 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2059 if (ipv6_addr_any(&addr))
2060 return;
013b4d90 2061 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 2062}
2063
a9ed4a29 2064/* caller must hold RTNL */
20380731 2065static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2066{
2067 struct in6_addr addr;
c15b1cca 2068
88ad3149 2069 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 2070 return;
1da177e4
LT		 2071 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2072 if (ipv6_addr_any(&addr))
2073 return;
2074 __ipv6_dev_ac_dec(ifp->idev, &addr);
2075}
2076
8a7a4b47 2077static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
06a4c1c5 2078{
8a7a4b47
AA		 2079 switch (dev->addr_len) {
2080 case ETH_ALEN:
9dae2e03
LAD		 2081 memcpy(eui, dev->dev_addr, 3);
2082 eui[3] = 0xFF;
2083 eui[4] = 0xFE;
2084 memcpy(eui + 5, dev->dev_addr + 3, 3);
2085 break;
8a7a4b47
AA		 2086 case EUI64_ADDR_LEN:
2087 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2088 eui[0] ^= 2;
2089 break;
2090 default:
06a4c1c5 2091 return -1;
8a7a4b47
AA		 2092 }
2093
06a4c1c5 2094 return 0;
2095}
2096
cb6bf355
YH		 2097static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2098{
2099 union fwnet_hwaddr *ha;
2100
2101 if (dev->addr_len != FWNET_ALEN)
2102 return -1;
2103
2104 ha = (union fwnet_hwaddr *)dev->dev_addr;
2105
2106 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2107 eui[0] ^= 2;
2108 return 0;
2109}
2110
073a8e0e
YH		 2111static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2112{
2113 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2114 if (dev->addr_len != ARCNET_ALEN)
2115 return -1;
2116 memset(eui, 0, 7);
8e5e8f30 2117 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 2118 return 0;
2119}
2120
2121static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2122{
2123 if (dev->addr_len != INFINIBAND_ALEN)
2124 return -1;
2125 memcpy(eui, dev->dev_addr + 12, 8);
2126 eui[0] |= 2;
2127 return 0;
2128}
2129
c61393ea 2130static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2131{
9af28511
SH		 2132 if (addr == 0)
2133 return -1;
dfd982ba
YH		 2134 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2135 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2136 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2137 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2138 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2139 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2140 eui[1] = 0;
2141 eui[2] = 0x5E;
2142 eui[3] = 0xFE;
2143 memcpy(eui + 4, &addr, 4);
2144 return 0;
2145}
dfd982ba
YH		 2146
2147static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2148{
2149 if (dev->priv_flags & IFF_ISATAP)
2150 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2151 return -1;
2152}
2153
aee80b54 2154static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2155{
2156 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2157}
2158
e837735e
ND		 2159static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2160{
2161 memcpy(eui, dev->perm_addr, 3);
2162 memcpy(eui + 5, dev->perm_addr + 3, 3);
2163 eui[3] = 0xFF;
2164 eui[4] = 0xFE;
2165 eui[0] ^= 2;
2166 return 0;
2167}
2168
1da177e4
LT		 2169static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2170{
2171 switch (dev->type) {
2172 case ARPHRD_ETHER:
2173 case ARPHRD_FDDI:
073a8e0e 2174 return addrconf_ifid_eui48(eui, dev);
1da177e4 2175 case ARPHRD_ARCNET:
073a8e0e 2176 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2177 case ARPHRD_INFINIBAND:
073a8e0e 2178 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2179 case ARPHRD_SIT:
dfd982ba 2180 return addrconf_ifid_sit(eui, dev);
aee80b54 2181 case ARPHRD_IPGRE:
45ce0fd1 2182 case ARPHRD_TUNNEL:
aee80b54 2183 return addrconf_ifid_gre(eui, dev);
e74bccb8 2184 case ARPHRD_6LOWPAN:
8a7a4b47 2185 return addrconf_ifid_6lowpan(eui, dev);
cb6bf355
YH		 2186 case ARPHRD_IEEE1394:
2187 return addrconf_ifid_ieee1394(eui, dev);
e837735e 2188 case ARPHRD_TUNNEL6:
45ce0fd1 2189 case ARPHRD_IP6GRE:
e837735e 2190 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2191 }
2192 return -1;
2193}
2194
2195static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2196{
2197 int err = -1;
2198 struct inet6_ifaddr *ifp;
2199
2200 read_lock_bh(&idev->lock);
602582ca
HFS		 2201 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2202 if (ifp->scope > IFA_LINK)
2203 break;
1da177e4
LT		 2204 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2205 memcpy(eui, ifp->addr.s6_addr+8, 8);
2206 err = 0;
2207 break;
2208 }
2209 }
2210 read_unlock_bh(&idev->lock);
2211 return err;
2212}
2213
1da177e4 2214/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
9d6280da 2215static void ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2216{
1da177e4 2217regen:
955189ef 2218 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2219 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2220
2221 /*
2222 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2223 * check if generated address is not inappropriate
2224 *
2225 * - Reserved subnet anycast (RFC 2526)
2226 * 11111101 11....11 1xxxxxxx
c7dc89c0 2227 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2228 * 00-00-5E-FE-xx-xx-xx-xx
2229 * - value 0
2230 * - XXX: already assigned to an address on the device
2231 */
1ab1457c 2232 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2233 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2234 (idev->rndid[7]&0x80))
2235 goto regen;
2236 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2237 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2238 goto regen;
2239 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2240 goto regen;
2241 }
1da177e4
LT		 2242}
2243
9d6280da 2244static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2245{
1da177e4 2246 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
9d6280da 2247 ipv6_regen_rndid(idev);
1da177e4 2248}
1da177e4
LT		 2249
2250/*
2251 * Add prefix route.
2252 */
2253
2254static void
2255addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2256 unsigned long expires, u32 flags)
1da177e4 2257{
86872cb5 2258 struct fib6_config cfg = {
ca254490 2259 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
86872cb5
TG		 2260 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2261 .fc_ifindex = dev->ifindex,
2262 .fc_expires = expires,
2263 .fc_dst_len = plen,
2264 .fc_flags = RTF_UP | flags,
c346dca1 2265 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2266 .fc_protocol = RTPROT_KERNEL,
86872cb5 2267 };
1da177e4 2268
4e3fd7a0 2269 cfg.fc_dst = *pfx;
1da177e4
LT		 2270
2271 /* Prevent useless cloning on PtP SIT.
2272 This thing is done here expecting that the whole
2273 class of non-broadcast devices need not cloning.
2274 */
07a93626 2275#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2276 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2277 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2278#endif
1da177e4 2279
86872cb5 2280 ip6_route_add(&cfg);
1da177e4
LT		 2281}
2282
14ef37b6
AH		 2283
2284static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2285 int plen,
2286 const struct net_device *dev,
2287 u32 flags, u32 noflags)
2288{
2289 struct fib6_node *fn;
2290 struct rt6_info *rt = NULL;
2291 struct fib6_table *table;
ca254490 2292 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2293
ca254490 2294 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2295 if (!table)
14ef37b6
AH		 2296 return NULL;
2297
5744dd9b 2298 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 2299 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2300 if (!fn)
2301 goto out;
1f56a01f
MKL		 2302
2303 noflags |= RTF_CACHE;
14ef37b6 2304 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 2305 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2306 continue;
2307 if ((rt->rt6i_flags & flags) != flags)
2308 continue;
85da53bf 2309 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6
AH		 2310 continue;
2311 dst_hold(&rt->dst);
2312 break;
2313 }
2314out:
5744dd9b 2315 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 2316 return rt;
2317}
2318
2319
1da177e4
LT		 2320/* Create "default" multicast route to the interface */
2321
2322static void addrconf_add_mroute(struct net_device *dev)
2323{
86872cb5 2324 struct fib6_config cfg = {
ca254490 2325 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2326 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2327 .fc_ifindex = dev->ifindex,
2328 .fc_dst_len = 8,
2329 .fc_flags = RTF_UP,
c346dca1 2330 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2331 };
2332
2333 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2334
2335 ip6_route_add(&cfg);
1da177e4
LT		 2336}
2337
1da177e4
LT		 2338static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2339{
2340 struct inet6_dev *idev;
2341
2342 ASSERT_RTNL();
2343
e21e8467
SH		 2344 idev = ipv6_find_idev(dev);
2345 if (!idev)
64e724f6
BH		 2346 return ERR_PTR(-ENOBUFS);
2347
2348 if (idev->cnf.disable_ipv6)
2349 return ERR_PTR(-EACCES);
1da177e4
LT		 2350
2351 /* Add default multicast route */
ba46ee4c 2352 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
4af04aba 2353 addrconf_add_mroute(dev);
1da177e4 2354
1da177e4
LT		 2355 return idev;
2356}
2357
53bd6749
JP		 2358static void manage_tempaddrs(struct inet6_dev *idev,
2359 struct inet6_ifaddr *ifp,
2360 __u32 valid_lft, __u32 prefered_lft,
2361 bool create, unsigned long now)
2362{
2363 u32 flags;
2364 struct inet6_ifaddr *ift;
2365
2366 read_lock_bh(&idev->lock);
2367 /* update all temporary addresses in the list */
2368 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2369 int age, max_valid, max_prefered;
2370
2371 if (ifp != ift->ifpub)
2372 continue;
2373
2374 /* RFC 4941 section 3.3:
2375 * If a received option will extend the lifetime of a public
2376 * address, the lifetimes of temporary addresses should
2377 * be extended, subject to the overall constraint that no
2378 * temporary addresses should ever remain "valid" or "preferred"
2379 * for a time longer than (TEMP_VALID_LIFETIME) or
2380 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2381 */
2382 age = (now - ift->cstamp) / HZ;
2383 max_valid = idev->cnf.temp_valid_lft - age;
2384 if (max_valid < 0)
2385 max_valid = 0;
2386
2387 max_prefered = idev->cnf.temp_prefered_lft -
76506a98 2388 idev->desync_factor - age;
53bd6749
JP		 2389 if (max_prefered < 0)
2390 max_prefered = 0;
2391
2392 if (valid_lft > max_valid)
2393 valid_lft = max_valid;
2394
2395 if (prefered_lft > max_prefered)
2396 prefered_lft = max_prefered;
2397
2398 spin_lock(&ift->lock);
2399 flags = ift->flags;
2400 ift->valid_lft = valid_lft;
2401 ift->prefered_lft = prefered_lft;
2402 ift->tstamp = now;
2403 if (prefered_lft > 0)
2404 ift->flags &= ~IFA_F_DEPRECATED;
2405
2406 spin_unlock(&ift->lock);
2407 if (!(flags&IFA_F_TENTATIVE))
2408 ipv6_ifa_notify(0, ift);
2409 }
2410
2411 if ((create || list_empty(&idev->tempaddr_list)) &&
2412 idev->cnf.use_tempaddr > 0) {
2413 /* When a new public address is created as described
2414 * in [ADDRCONF], also create a new temporary address.
2415 * Also create a temporary address if it's enabled but
2416 * no temporary address currently exists.
2417 */
2418 read_unlock_bh(&idev->lock);
2419 ipv6_create_tempaddr(ifp, NULL);
2420 } else {
2421 read_unlock_bh(&idev->lock);
2422 }
2423}
2424
cc9da6cc
BM		 2425static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2426{
d35a00b8
FJ		 2427 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2428 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc
BM		 2429}
2430
cc84b3c6
AA		 2431int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2432 const struct prefix_info *pinfo,
2433 struct inet6_dev *in6_dev,
2434 const struct in6_addr *addr, int addr_type,
2435 u32 addr_flags, bool sllao, bool tokenized,
2436 __u32 valid_lft, u32 prefered_lft)
4f672235
AA		 2437{
2438 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2439 int create = 0, update_lft = 0;
2440
2441 if (!ifp && valid_lft) {
2442 int max_addresses = in6_dev->cnf.max_addresses;
2443
2444#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2445 if (in6_dev->cnf.optimistic_dad &&
2446 !net->ipv6.devconf_all->forwarding && sllao)
2447 addr_flags |= IFA_F_OPTIMISTIC;
2448#endif
2449
2450 /* Do not allow to create too much of autoconfigured
2451 * addresses; this would be too easy way to crash kernel.
2452 */
2453 if (!max_addresses ||
2454 ipv6_count_addresses(in6_dev) < max_addresses)
2455 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2456 pinfo->prefix_len,
2457 addr_type&IPV6_ADDR_SCOPE_MASK,
2458 addr_flags, valid_lft,
2459 prefered_lft);
2460
2461 if (IS_ERR_OR_NULL(ifp))
2462 return -1;
2463
2464 update_lft = 0;
2465 create = 1;
2466 spin_lock_bh(&ifp->lock);
2467 ifp->flags |= IFA_F_MANAGETEMPADDR;
2468 ifp->cstamp = jiffies;
2469 ifp->tokenized = tokenized;
2470 spin_unlock_bh(&ifp->lock);
2471 addrconf_dad_start(ifp);
2472 }
2473
2474 if (ifp) {
2475 u32 flags;
2476 unsigned long now;
2477 u32 stored_lft;
2478
2479 /* update lifetime (RFC2462 5.5.3 e) */
2480 spin_lock_bh(&ifp->lock);
2481 now = jiffies;
2482 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2483 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2484 else
2485 stored_lft = 0;
2486 if (!update_lft && !create && stored_lft) {
2487 const u32 minimum_lft = min_t(u32,
2488 stored_lft, MIN_VALID_LIFETIME);
2489 valid_lft = max(valid_lft, minimum_lft);
2490
2491 /* RFC4862 Section 5.5.3e:
2492 * "Note that the preferred lifetime of the
2493 * corresponding address is always reset to
2494 * the Preferred Lifetime in the received
2495 * Prefix Information option, regardless of
2496 * whether the valid lifetime is also reset or
2497 * ignored."
2498 *
2499 * So we should always update prefered_lft here.
2500 */
2501 update_lft = 1;
2502 }
2503
2504 if (update_lft) {
2505 ifp->valid_lft = valid_lft;
2506 ifp->prefered_lft = prefered_lft;
2507 ifp->tstamp = now;
2508 flags = ifp->flags;
2509 ifp->flags &= ~IFA_F_DEPRECATED;
2510 spin_unlock_bh(&ifp->lock);
2511
2512 if (!(flags&IFA_F_TENTATIVE))
2513 ipv6_ifa_notify(0, ifp);
2514 } else
2515 spin_unlock_bh(&ifp->lock);
2516
2517 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2518 create, now);
2519
2520 in6_ifa_put(ifp);
2521 addrconf_verify();
2522 }
2523
2524 return 0;
2525}
cc84b3c6 2526EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
4f672235 2527
e6bff995 2528void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2529{
2530 struct prefix_info *pinfo;
2531 __u32 valid_lft;
2532 __u32 prefered_lft;
4f672235 2533 int addr_type, err;
64236f3f 2534 u32 addr_flags = 0;
1da177e4 2535 struct inet6_dev *in6_dev;
56d417b1 2536 struct net *net = dev_net(dev);
1da177e4
LT		 2537
2538 pinfo = (struct prefix_info *) opt;
1ab1457c 2539
1da177e4 2540 if (len < sizeof(struct prefix_info)) {
ba3542e1 2541 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2542 return;
2543 }
1ab1457c 2544
1da177e4
LT		 2545 /*
2546 * Validation checks ([ADDRCONF], page 19)
2547 */
2548
2549 addr_type = ipv6_addr_type(&pinfo->prefix);
2550
2551 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2552 return;
2553
2554 valid_lft = ntohl(pinfo->valid);
2555 prefered_lft = ntohl(pinfo->prefered);
2556
2557 if (prefered_lft > valid_lft) {
e87cc472 2558 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2559 return;
2560 }
2561
2562 in6_dev = in6_dev_get(dev);
2563
63159f29 2564 if (!in6_dev) {
e87cc472
JP		 2565 net_dbg_ratelimited("addrconf: device %s not configured\n",
2566 dev->name);
1da177e4
LT		 2567 return;
2568 }
2569
2570 /*
2571 * Two things going on here:
2572 * 1) Add routes for on-link prefixes
2573 * 2) Configure prefixes with the auto flag set
2574 */
2575
4bed72e4
YH		 2576 if (pinfo->onlink) {
2577 struct rt6_info *rt;
2578 unsigned long rt_expires;
2579
6f704992
YH		 2580 /* Avoid arithmetic overflow. Really, we could
2581 * save rt_expires in seconds, likely valid_lft,
2582 * but it would require division in fib gc, that it
2583 * not good.
2584 */
4bed72e4
YH		 2585 if (HZ > USER_HZ)
2586 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2587 else
2588 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2589
4bed72e4
YH		 2590 if (addrconf_finite_timeout(rt_expires))
2591 rt_expires *= HZ;
1da177e4 2592
14ef37b6
AH		 2593 rt = addrconf_get_prefix_route(&pinfo->prefix,
2594 pinfo->prefix_len,
2595 dev,
2596 RTF_ADDRCONF | RTF_PREFIX_RT,
2597 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2598
14ef37b6 2599 if (rt) {
6f704992
YH		 2600 /* Autoconf prefix route */
2601 if (valid_lft == 0) {
2602 ip6_del_rt(rt);
2603 rt = NULL;
4bed72e4 2604 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2605 /* not infinity */
1716a961 2606 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2607 } else {
1716a961 2608 rt6_clean_expires(rt);
1da177e4
LT		 2609 }
2610 } else if (valid_lft) {
6f704992 2611 clock_t expires = 0;
4bed72e4
YH		 2612 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2613 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2614 /* not infinity */
2615 flags |= RTF_EXPIRES;
2616 expires = jiffies_to_clock_t(rt_expires);
2617 }
1da177e4 2618 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2619 dev, expires, flags);
1da177e4 2620 }
94e187c0 2621 ip6_rt_put(rt);
1da177e4
LT		 2622 }
2623
2624 /* Try to figure out our local address for this prefix */
2625
2626 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1da177e4 2627 struct in6_addr addr;
f997c55c 2628 bool tokenized = false, dev_addr_generated = false;
1da177e4
LT		 2629
2630 if (pinfo->prefix_len == 64) {
2631 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2632
2633 if (!ipv6_addr_any(&in6_dev->token)) {
2634 read_lock_bh(&in6_dev->lock);
2635 memcpy(addr.s6_addr + 8,
2636 in6_dev->token.s6_addr + 8, 8);
2637 read_unlock_bh(&in6_dev->lock);
617fe29d 2638 tokenized = true;
cc9da6cc 2639 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2640 !ipv6_generate_stable_address(&addr, 0,
2641 in6_dev)) {
64236f3f 2642 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2643 goto ok;
f53adae4
DB		 2644 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2645 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
4f672235 2646 goto put;
f997c55c
AA		 2647 } else {
2648 dev_addr_generated = true;
1da177e4
LT		 2649 }
2650 goto ok;
2651 }
e87cc472
JP		 2652 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2653 pinfo->prefix_len);
4f672235 2654 goto put;
1da177e4
LT		 2655
2656ok:
4f672235
AA		 2657 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2658 &addr, addr_type,
2659 addr_flags, sllao,
2660 tokenized, valid_lft,
2661 prefered_lft);
2662 if (err)
2663 goto put;
f997c55c
AA		 2664
2665 /* Ignore error case here because previous prefix add addr was
2666 * successful which will be notified.
2667 */
2668 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2669 addr_type, addr_flags, sllao,
2670 tokenized, valid_lft,
2671 prefered_lft,
2672 dev_addr_generated);
1da177e4
LT		 2673 }
2674 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
4f672235 2675put:
1da177e4
LT		 2676 in6_dev_put(in6_dev);
2677}
2678
2679/*
2680 * Set destination address.
2681 * Special case for SIT interfaces where we create a new "virtual"
2682 * device.
2683 */
af284937 2684int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2685{
2686 struct in6_ifreq ireq;
2687 struct net_device *dev;
2688 int err = -EINVAL;
2689
2690 rtnl_lock();
2691
2692 err = -EFAULT;
2693 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2694 goto err_exit;
2695
af284937 2696 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2697
2698 err = -ENODEV;
63159f29 2699 if (!dev)
1da177e4
LT		 2700 goto err_exit;
2701
07a93626 2702#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2703 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2704 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2705 struct ifreq ifr;
1da177e4
LT		 2706 struct ip_tunnel_parm p;
2707
2708 err = -EADDRNOTAVAIL;
2709 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2710 goto err_exit;
2711
2712 memset(&p, 0, sizeof(p));
2713 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2714 p.iph.saddr = 0;
2715 p.iph.version = 4;
2716 p.iph.ihl = 5;
2717 p.iph.protocol = IPPROTO_IPV6;
2718 p.iph.ttl = 64;
d20b3109 2719 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2720
5bc3eb7e
SH		 2721 if (ops->ndo_do_ioctl) {
2722 mm_segment_t oldfs = get_fs();
2723
2724 set_fs(KERNEL_DS);
2725 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2726 set_fs(oldfs);
2727 } else
2728 err = -EOPNOTSUPP;
1da177e4
LT		 2729
2730 if (err == 0) {
2731 err = -ENOBUFS;
af284937
DL		 2732 dev = __dev_get_by_name(net, p.name);
2733 if (!dev)
1da177e4
LT		 2734 goto err_exit;
2735 err = dev_open(dev);
2736 }
2737 }
0be669bb 2738#endif
1da177e4
LT		 2739
2740err_exit:
2741 rtnl_unlock();
2742 return err;
2743}
2744
93a714d6
MC		 2745static int ipv6_mc_config(struct sock *sk, bool join,
2746 const struct in6_addr *addr, int ifindex)
2747{
2748 int ret;
2749
2750 ASSERT_RTNL();
2751
2752 lock_sock(sk);
2753 if (join)
54ff9ef3 2754 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2755 else
54ff9ef3 2756 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2757 release_sock(sk);
2758
2759 return ret;
2760}
2761
1da177e4
LT		 2762/*
2763 * Manual configuration of address on an interface
2764 */
479840ff
JP		 2765static int inet6_addr_add(struct net *net, int ifindex,
2766 const struct in6_addr *pfx,
caeaba79 2767 const struct in6_addr *peer_pfx,
479840ff
JP		 2768 unsigned int plen, __u32 ifa_flags,
2769 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2770{
2771 struct inet6_ifaddr *ifp;
2772 struct inet6_dev *idev;
2773 struct net_device *dev;
93a714d6
MC		 2774 unsigned long timeout;
2775 clock_t expires;
1da177e4 2776 int scope;
6f704992 2777 u32 flags;
1da177e4
LT		 2778
2779 ASSERT_RTNL();
1ab1457c 2780
24ef0da7
TG		 2781 if (plen > 128)
2782 return -EINVAL;
2783
0778769d
NT		 2784 /* check the lifetime */
2785 if (!valid_lft || prefered_lft > valid_lft)
2786 return -EINVAL;
2787
53bd6749
JP		 2788 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2789 return -EINVAL;
2790
af284937
DL		 2791 dev = __dev_get_by_index(net, ifindex);
2792 if (!dev)
1da177e4 2793 return -ENODEV;
1ab1457c 2794
64e724f6
BH		 2795 idev = addrconf_add_dev(dev);
2796 if (IS_ERR(idev))
2797 return PTR_ERR(idev);
1da177e4 2798
93a714d6
MC		 2799 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2800 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2801 true, pfx, ifindex);
2802
2803 if (ret < 0)
2804 return ret;
2805 }
2806
1da177e4
LT		 2807 scope = ipv6_addr_scope(pfx);
2808
4bed72e4
YH		 2809 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2810 if (addrconf_finite_timeout(timeout)) {
2811 expires = jiffies_to_clock_t(timeout * HZ);
2812 valid_lft = timeout;
6f704992 2813 flags = RTF_EXPIRES;
4bed72e4
YH		 2814 } else {
2815 expires = 0;
2816 flags = 0;
2817 ifa_flags |= IFA_F_PERMANENT;
6f704992 2818 }
0778769d 2819
4bed72e4
YH		 2820 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2821 if (addrconf_finite_timeout(timeout)) {
2822 if (timeout == 0)
2823 ifa_flags |= IFA_F_DEPRECATED;
2824 prefered_lft = timeout;
2825 }
0778769d 2826
8a226b2c
JB		 2827 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2828 valid_lft, prefered_lft);
0778769d 2829
1da177e4 2830 if (!IS_ERR(ifp)) {
761aac73
TH		 2831 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2832 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2833 expires, flags);
2834 }
2835
95c385b4
NH		 2836 /*
2837 * Note that section 3.1 of RFC 4429 indicates
2838 * that the Optimistic flag should not be set for
2839 * manually configured addresses
2840 */
cf22f9a2 2841 addrconf_dad_start(ifp);
53bd6749
JP		 2842 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2843 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2844 true, jiffies);
1da177e4 2845 in6_ifa_put(ifp);
c15b1cca 2846 addrconf_verify_rtnl();
1da177e4 2847 return 0;
93a714d6
MC		 2848 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2849 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2850 false, pfx, ifindex);
1da177e4
LT		 2851 }
2852
2853 return PTR_ERR(ifp);
2854}
2855
6046d5b4
HK		 2856static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2857 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2858{
2859 struct inet6_ifaddr *ifp;
2860 struct inet6_dev *idev;
2861 struct net_device *dev;
1ab1457c 2862
24ef0da7
TG		 2863 if (plen > 128)
2864 return -EINVAL;
2865
af284937
DL		 2866 dev = __dev_get_by_index(net, ifindex);
2867 if (!dev)
1da177e4
LT		 2868 return -ENODEV;
2869
e5d08d71 2870 idev = __in6_dev_get(dev);
63159f29 2871 if (!idev)
1da177e4
LT		 2872 return -ENXIO;
2873
2874 read_lock_bh(&idev->lock);
502a2ffd 2875 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2876 if (ifp->prefix_len == plen &&
2877 ipv6_addr_equal(pfx, &ifp->addr)) {
2878 in6_ifa_hold(ifp);
2879 read_unlock_bh(&idev->lock);
1ab1457c 2880
6046d5b4
HK		 2881 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2882 (ifa_flags & IFA_F_MANAGETEMPADDR))
2883 manage_tempaddrs(idev, ifp, 0, 0, false,
2884 jiffies);
1da177e4 2885 ipv6_del_addr(ifp);
6046d5b4 2886 addrconf_verify_rtnl();
93a714d6
MC		 2887 if (ipv6_addr_is_multicast(pfx)) {
2888 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2889 false, pfx, dev->ifindex);
2890 }
1da177e4
LT		 2891 return 0;
2892 }
2893 }
2894 read_unlock_bh(&idev->lock);
2895 return -EADDRNOTAVAIL;
2896}
2897
2898
af284937 2899int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2900{
2901 struct in6_ifreq ireq;
2902 int err;
1ab1457c 2903
af31f412 2904 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2905 return -EPERM;
1ab1457c 2906
1da177e4
LT		 2907 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2908 return -EFAULT;
2909
2910 rtnl_lock();
caeaba79 2911 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2912 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2913 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2914 rtnl_unlock();
2915 return err;
2916}
2917
af284937 2918int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2919{
2920 struct in6_ifreq ireq;
2921 int err;
1ab1457c 2922
af31f412 2923 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2924 return -EPERM;
2925
2926 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2927 return -EFAULT;
2928
2929 rtnl_lock();
6046d5b4 2930 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2931 ireq.ifr6_prefixlen);
1da177e4
LT		 2932 rtnl_unlock();
2933 return err;
2934}
2935
b5f348e5
IJ		 2936static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2937 int plen, int scope)
2938{
2939 struct inet6_ifaddr *ifp;
2940
8a226b2c 2941 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2942 scope, IFA_F_PERMANENT,
2943 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2944 if (!IS_ERR(ifp)) {
2945 spin_lock_bh(&ifp->lock);
2946 ifp->flags &= ~IFA_F_TENTATIVE;
2947 spin_unlock_bh(&ifp->lock);
764d3be6 2948 rt_genid_bump_ipv6(dev_net(idev->dev));
b5f348e5
IJ		 2949 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2950 in6_ifa_put(ifp);
2951 }
2952}
2953
07a93626 2954#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2955static void sit_add_v4_addrs(struct inet6_dev *idev)
2956{
1da177e4
LT		 2957 struct in6_addr addr;
2958 struct net_device *dev;
c346dca1 2959 struct net *net = dev_net(idev->dev);
929c9cf3 2960 int scope, plen;
f0e2acfa 2961 u32 pflags = 0;
1da177e4
LT		 2962
2963 ASSERT_RTNL();
2964
2965 memset(&addr, 0, sizeof(struct in6_addr));
2966 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2967
2968 if (idev->dev->flags&IFF_POINTOPOINT) {
2969 addr.s6_addr32[0] = htonl(0xfe800000);
2970 scope = IFA_LINK;
929c9cf3 2971 plen = 64;
1da177e4
LT		 2972 } else {
2973 scope = IPV6_ADDR_COMPATv4;
929c9cf3 2974 plen = 96;
f0e2acfa 2975 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 2976 }
2977
2978 if (addr.s6_addr32[3]) {
929c9cf3 2979 add_addr(idev, &addr, plen, scope);
f0e2acfa 2980 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 2981 return;
2982 }
2983
6fda7350 2984 for_each_netdev(net, dev) {
8e5e8f30 2985 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2986 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2987 struct in_ifaddr *ifa;
1da177e4
LT		 2988
2989 int flag = scope;
2990
2991 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 2992
2993 addr.s6_addr32[3] = ifa->ifa_local;
2994
2995 if (ifa->ifa_scope == RT_SCOPE_LINK)
2996 continue;
2997 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2998 if (idev->dev->flags&IFF_POINTOPOINT)
2999 continue;
3000 flag |= IFA_HOST;
3001 }
1da177e4 3002
b5f348e5 3003 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 3004 addrconf_prefix_route(&addr, plen, idev->dev, 0,
3005 pflags);
1da177e4
LT		 3006 }
3007 }
1ab1457c 3008 }
1da177e4 3009}
0be669bb 3010#endif
1da177e4
LT		 3011
3012static void init_loopback(struct net_device *dev)
3013{
3014 struct inet6_dev *idev;
25fb6ca4
BK		 3015 struct net_device *sp_dev;
3016 struct inet6_ifaddr *sp_ifa;
3017 struct rt6_info *sp_rt;
1da177e4
LT		 3018
3019 /* ::1 */
3020
3021 ASSERT_RTNL();
3022
e5d08d71 3023 idev = ipv6_find_idev(dev);
63159f29 3024 if (!idev) {
91df42be 3025 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3026 return;
3027 }
3028
b5f348e5 3029 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
25fb6ca4
BK		 3030
3031 /* Add routes to other interface's IPv6 addresses */
3032 for_each_netdev(dev_net(dev), sp_dev) {
3033 if (!strcmp(sp_dev->name, dev->name))
3034 continue;
3035
3036 idev = __in6_dev_get(sp_dev);
3037 if (!idev)
3038 continue;
3039
3040 read_lock_bh(&idev->lock);
3041 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
3042
3043 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
3044 continue;
3045
33d99113
G		 3046 if (sp_ifa->rt) {
3047 /* This dst has been added to garbage list when
3048 * lo device down, release this obsolete dst and
3049 * reallocate a new router for ifa.
3050 */
a220445f 3051 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
33d99113
G		 3052 ip6_rt_put(sp_ifa->rt);
3053 sp_ifa->rt = NULL;
3054 } else {
3055 continue;
3056 }
3057 }
a881ae1f 3058
57ec0afe 3059 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
25fb6ca4
BK		 3060
3061 /* Failure cases are ignored */
534c8779
G		 3062 if (!IS_ERR(sp_rt)) {
3063 sp_ifa->rt = sp_rt;
25fb6ca4 3064 ip6_ins_rt(sp_rt);
534c8779 3065 }
25fb6ca4
BK		 3066 }
3067 read_unlock_bh(&idev->lock);
3068 }
1da177e4
LT		 3069}
3070
2ad3ed59
AA		 3071void addrconf_add_linklocal(struct inet6_dev *idev,
3072 const struct in6_addr *addr, u32 flags)
1da177e4 3073{
8e5e8f30 3074 struct inet6_ifaddr *ifp;
64236f3f 3075 u32 addr_flags = flags | IFA_F_PERMANENT;
95c385b4
NH		 3076
3077#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3078 if (idev->cnf.optimistic_dad &&
702beb87 3079 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 3080 addr_flags |= IFA_F_OPTIMISTIC;
3081#endif
1da177e4 3082
07edd741
HFS		 3083 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3084 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 3085 if (!IS_ERR(ifp)) {
46d48046 3086 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 3087 addrconf_dad_start(ifp);
1da177e4
LT		 3088 in6_ifa_put(ifp);
3089 }
3090}
2ad3ed59 3091EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
1da177e4 3092
622c81d5
HFS		 3093static bool ipv6_reserved_interfaceid(struct in6_addr address)
3094{
3095 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3096 return true;
3097
3098 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3099 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3100 return true;
3101
3102 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3103 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3104 return true;
3105
3106 return false;
3107}
3108
3109static int ipv6_generate_stable_address(struct in6_addr *address,
3110 u8 dad_count,
3111 const struct inet6_dev *idev)
3112{
622c81d5
HFS		 3113 static DEFINE_SPINLOCK(lock);
3114 static __u32 digest[SHA_DIGEST_WORDS];
3115 static __u32 workspace[SHA_WORKSPACE_WORDS];
3116
3117 static union {
3118 char __data[SHA_MESSAGE_BYTES];
3119 struct {
3120 struct in6_addr secret;
ff40217e 3121 __be32 prefix[2];
622c81d5
HFS		 3122 unsigned char hwaddr[MAX_ADDR_LEN];
3123 u8 dad_count;
3124 } __packed;
3125 } data;
3126
3127 struct in6_addr secret;
3128 struct in6_addr temp;
3129 struct net *net = dev_net(idev->dev);
3130
3131 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3132
3133 if (idev->cnf.stable_secret.initialized)
3134 secret = idev->cnf.stable_secret.secret;
3135 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3136 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3137 else
3138 return -1;
3139
3140retry:
3141 spin_lock_bh(&lock);
3142
3143 sha_init(digest);
3144 memset(&data, 0, sizeof(data));
3145 memset(workspace, 0, sizeof(workspace));
3146 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3147 data.prefix[0] = address->s6_addr32[0];
3148 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3149 data.secret = secret;
3150 data.dad_count = dad_count;
3151
3152 sha_transform(digest, data.__data, workspace);
3153
3154 temp = *address;
ff40217e
HFS		 3155 temp.s6_addr32[2] = (__force __be32)digest[0];
3156 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3157
3158 spin_unlock_bh(&lock);
3159
3160 if (ipv6_reserved_interfaceid(temp)) {
3161 dad_count++;
1855b7c3 3162 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3163 return -1;
3164 goto retry;
3165 }
3166
3167 *address = temp;
3168 return 0;
3169}
3170
cc9da6cc
BM		 3171static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3172{
3173 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3174
3175 if (s->initialized)
3176 return;
3177 s = &idev->cnf.stable_secret;
3178 get_random_bytes(&s->secret, sizeof(s->secret));
3179 s->initialized = true;
3180}
3181
bc91b0f0
JP		 3182static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3183{
622c81d5
HFS		 3184 struct in6_addr addr;
3185
ca254490
DA		 3186 /* no link local addresses on L3 master devices */
3187 if (netif_is_l3_master(idev->dev))
3188 return;
3189
622c81d5 3190 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3191
d35a00b8 3192 switch (idev->cnf.addr_gen_mode) {
cc9da6cc
BM		 3193 case IN6_ADDR_GEN_MODE_RANDOM:
3194 ipv6_gen_mode_random_init(idev);
3195 /* fallthrough */
3196 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3197 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3198 addrconf_add_linklocal(idev, &addr,
3199 IFA_F_STABLE_PRIVACY);
622c81d5
HFS		 3200 else if (prefix_route)
3201 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3202 break;
3203 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3204 /* addrconf_add_linklocal also adds a prefix_route and we
3205 * only need to care about prefix routes if ipv6_generate_eui64
3206 * couldn't generate one.
3207 */
3208 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3209 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0
JP		 3210 else if (prefix_route)
3211 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3212 break;
3213 case IN6_ADDR_GEN_MODE_NONE:
3214 default:
3215 /* will not add any link local address */
3216 break;
bc91b0f0
JP		 3217 }
3218}
3219
1da177e4
LT		 3220static void addrconf_dev_config(struct net_device *dev)
3221{
8e5e8f30 3222 struct inet6_dev *idev;
1da177e4
LT		 3223
3224 ASSERT_RTNL();
3225
74235a25
HX		 3226 if ((dev->type != ARPHRD_ETHER) &&
3227 (dev->type != ARPHRD_FDDI) &&
74235a25 3228 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3229 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3230 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3231 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc 3232 (dev->type != ARPHRD_6LOWPAN) &&
45ce0fd1
FJ		 3233 (dev->type != ARPHRD_IP6GRE) &&
3234 (dev->type != ARPHRD_IPGRE) &&
3235 (dev->type != ARPHRD_TUNNEL) &&
cc9da6cc 3236 (dev->type != ARPHRD_NONE)) {
74235a25
HX		 3237 /* Alas, we support only Ethernet autoconfiguration. */
3238 return;
3239 }
3240
1da177e4 3241 idev = addrconf_add_dev(dev);
64e724f6 3242 if (IS_ERR(idev))
1da177e4
LT		 3243 return;
3244
cc9da6cc
BM		 3245 /* this device type has no EUI support */
3246 if (dev->type == ARPHRD_NONE &&
d35a00b8
FJ		 3247 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3248 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc 3249
bc91b0f0 3250 addrconf_addr_gen(idev, false);
1da177e4
LT		 3251}
3252
07a93626 3253#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3254static void addrconf_sit_config(struct net_device *dev)
3255{
3256 struct inet6_dev *idev;
3257
3258 ASSERT_RTNL();
3259
1ab1457c
YH		 3260 /*
3261 * Configure the tunnel with one of our IPv4
3262 * addresses... we should configure all of
1da177e4
LT		 3263 * our v4 addrs in the tunnel
3264 */
3265
e5d08d71 3266 idev = ipv6_find_idev(dev);
63159f29 3267 if (!idev) {
91df42be 3268 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3269 return;
3270 }
3271
c7dc89c0 3272 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3273 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3274 return;
3275 }
3276
1da177e4
LT		 3277 sit_add_v4_addrs(idev);
3278
62b54dd9 3279 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3280 addrconf_add_mroute(dev);
1da177e4 3281}
0be669bb 3282#endif
1da177e4 3283
07a93626 3284#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3285static void addrconf_gre_config(struct net_device *dev)
3286{
3287 struct inet6_dev *idev;
aee80b54 3288
aee80b54 3289 ASSERT_RTNL();
3290
e5d08d71 3291 idev = ipv6_find_idev(dev);
63159f29 3292 if (!idev) {
91df42be 3293 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3294 return;
3295 }
3296
bc91b0f0 3297 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3298 if (dev->flags & IFF_POINTOPOINT)
3299 addrconf_add_mroute(dev);
aee80b54 3300}
3301#endif
3302
f1705ec1
DA		 3303static int fixup_permanent_addr(struct inet6_dev *idev,
3304 struct inet6_ifaddr *ifp)
3305{
8048ced9
DA		 3306 /* rt6i_ref == 0 means the host route was removed from the
3307 * FIB, for example, if 'lo' device is taken down. In that
3308 * case regenerate the host route.
3309 */
3310 if (!ifp->rt || !atomic_read(&ifp->rt->rt6i_ref)) {
3311 struct rt6_info *rt, *prev;
f1705ec1
DA		 3312
3313 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3314 if (unlikely(IS_ERR(rt)))
3315 return PTR_ERR(rt);
3316
8048ced9
DA		 3317 /* ifp->rt can be accessed outside of rtnl */
3318 spin_lock(&ifp->lock);
3319 prev = ifp->rt;
f1705ec1 3320 ifp->rt = rt;
8048ced9
DA		 3321 spin_unlock(&ifp->lock);
3322
3323 ip6_rt_put(prev);
f1705ec1
DA		 3324 }
3325
3326 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3327 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3328 idev->dev, 0, 0);
3329 }
3330
6d717134
DA		 3331 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3332 addrconf_dad_start(ifp);
f1705ec1
DA		 3333
3334 return 0;
3335}
3336
3337static void addrconf_permanent_addr(struct net_device *dev)
3338{
3339 struct inet6_ifaddr *ifp, *tmp;
3340 struct inet6_dev *idev;
3341
3342 idev = __in6_dev_get(dev);
3343 if (!idev)
3344 return;
3345
3346 write_lock_bh(&idev->lock);
3347
3348 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3349 if ((ifp->flags & IFA_F_PERMANENT) &&
3350 fixup_permanent_addr(idev, ifp) < 0) {
3351 write_unlock_bh(&idev->lock);
3352 ipv6_del_addr(ifp);
3353 write_lock_bh(&idev->lock);
3354
3355 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3356 idev->dev->name, &ifp->addr);
3357 }
3358 }
3359
3360 write_unlock_bh(&idev->lock);
3361}
3362
1ab1457c 3363static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3364 void *ptr)
1da177e4 3365{
351638e7 3366 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4f7f34ea 3367 struct netdev_notifier_changeupper_info *info;
748e2d93 3368 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 3369 int run_pending = 0;
b217d616 3370 int err;
1da177e4 3371
e21e8467 3372 switch (event) {
45ba9dd2 3373 case NETDEV_REGISTER:
74235a25 3374 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3375 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3376 if (IS_ERR(idev))
3377 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3378 }
3379 break;
bcdd553f 3380
b7b0b1d2
AD		 3381 case NETDEV_CHANGEMTU:
3382 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3383 if (dev->mtu < IPV6_MIN_MTU) {
3384 addrconf_ifdown(dev, 1);
3385 break;
3386 }
3387
3388 if (idev) {
3389 rt6_mtu_change(dev, dev->mtu);
3390 idev->cnf.mtu6 = dev->mtu;
3391 break;
3392 }
3393
3394 /* allocate new idev */
3395 idev = ipv6_add_dev(dev);
3396 if (IS_ERR(idev))
3397 break;
3398
3399 /* device is still not ready */
3400 if (!(idev->if_flags & IF_READY))
3401 break;
3402
3403 run_pending = 1;
3404
3405 /* fall through */
3406
1da177e4 3407 case NETDEV_UP:
3c21edbd 3408 case NETDEV_CHANGE:
c2edacf8
JV		 3409 if (dev->flags & IFF_SLAVE)
3410 break;
3411
3ce62a84
WC		 3412 if (idev && idev->cnf.disable_ipv6)
3413 break;
3414
3c21edbd 3415 if (event == NETDEV_UP) {
38bd10c4
DA		 3416 /* restore routes for permanent addresses */
3417 addrconf_permanent_addr(dev);
3418
f24e3d65 3419 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 3420 /* device is not ready yet. */
f3213831 3421 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3422 dev->name);
3423 break;
3424 }
99081049 3425
d31c7b8f
EP		 3426 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3427 idev = ipv6_add_dev(dev);
3428
a317a2f1 3429 if (!IS_ERR_OR_NULL(idev)) {
99081049 3430 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3431 run_pending = 1;
3432 }
b7b0b1d2 3433 } else if (event == NETDEV_CHANGE) {
f24e3d65 3434 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 3435 /* device is still not ready. */
3436 break;
3437 }
3438
3439 if (idev) {
a088d1d7
LL		 3440 if (idev->if_flags & IF_READY) {
3441 /* device is already configured -
3442 * but resend MLD reports, we might
3443 * have roamed and need to update
3444 * multicast snooping switches
3445 */
3446 ipv6_mc_up(idev);
3c21edbd 3447 break;
a088d1d7 3448 }
3c21edbd
YH		 3449 idev->if_flags |= IF_READY;
3450 }
3451
f3213831
JP		 3452 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3453 dev->name);
3c21edbd 3454
c5e33bdd 3455 run_pending = 1;
3c21edbd
YH		 3456 }
3457
e21e8467 3458 switch (dev->type) {
07a93626 3459#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3460 case ARPHRD_SIT:
3461 addrconf_sit_config(dev);
3462 break;
aee80b54 3463#endif
07a93626 3464#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3465 case ARPHRD_IPGRE:
3466 addrconf_gre_config(dev);
3467 break;
0be669bb 3468#endif
1da177e4
LT		 3469 case ARPHRD_LOOPBACK:
3470 init_loopback(dev);
3471 break;
3472
3473 default:
3474 addrconf_dev_config(dev);
3475 break;
3ff50b79 3476 }
bcdd553f 3477
a317a2f1 3478 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3479 if (run_pending)
3480 addrconf_dad_run(idev);
3481
bcdd553f
SH		 3482 /*
3483 * If the MTU changed during the interface down,
3484 * when the interface up, the changed MTU must be
3485 * reflected in the idev as well as routers.
1da177e4 3486 */
bcdd553f
SH		 3487 if (idev->cnf.mtu6 != dev->mtu &&
3488 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3489 rt6_mtu_change(dev, dev->mtu);
3490 idev->cnf.mtu6 = dev->mtu;
3491 }
3492 idev->tstamp = jiffies;
3493 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3494
3495 /*
3496 * If the changed mtu during down is lower than
3497 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3498 */
3499 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 3500 addrconf_ifdown(dev, 1);
1da177e4
LT		 3501 }
3502 break;
3503
1da177e4
LT		 3504 case NETDEV_DOWN:
3505 case NETDEV_UNREGISTER:
3506 /*
3507 * Remove all addresses from this interface.
3508 */
3509 addrconf_ifdown(dev, event != NETDEV_DOWN);
3510 break;
3c21edbd 3511
1da177e4 3512 case NETDEV_CHANGENAME:
1da177e4 3513 if (idev) {
5632c515 3514 snmp6_unregister_dev(idev);
408c4768 3515 addrconf_sysctl_unregister(idev);
a317a2f1 3516 err = addrconf_sysctl_register(idev);
b217d616
HX		 3517 if (err)
3518 return notifier_from_errno(err);
a317a2f1
WC		 3519 err = snmp6_register_dev(idev);
3520 if (err) {
3521 addrconf_sysctl_unregister(idev);
3522 return notifier_from_errno(err);
3523 }
5632c515 3524 }
1da177e4 3525 break;
bcdd553f 3526
93d9b7d7
JP		 3527 case NETDEV_PRE_TYPE_CHANGE:
3528 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3529 if (idev)
3530 addrconf_type_change(dev, event);
75c78500 3531 break;
4f7f34ea
DA		 3532
3533 case NETDEV_CHANGEUPPER:
3534 info = ptr;
3535
3536 /* flush all routes if dev is linked to or unlinked from
3537 * an L3 master device (e.g., VRF)
3538 */
3539 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3540 addrconf_ifdown(dev, 0);
3ff50b79 3541 }
1da177e4
LT		 3542
3543 return NOTIFY_OK;
3544}
3545
3546/*
3547 * addrconf module should be notified of a device going up
3548 */
3549static struct notifier_block ipv6_dev_notf = {
3550 .notifier_call = addrconf_notify,
1da177e4
LT		 3551};
3552
93d9b7d7 3553static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3554{
3555 struct inet6_dev *idev;
3556 ASSERT_RTNL();
3557
3558 idev = __in6_dev_get(dev);
3559
93d9b7d7 3560 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3561 ipv6_mc_remap(idev);
93d9b7d7 3562 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3563 ipv6_mc_unmap(idev);
3564}
3565
70af921d
DA		 3566static bool addr_is_local(const struct in6_addr *addr)
3567{
3568 return ipv6_addr_type(addr) &
3569 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3570}
3571
1da177e4
LT		 3572static int addrconf_ifdown(struct net_device *dev, int how)
3573{
c346dca1 3574 struct net *net = dev_net(dev);
502a2ffd 3575 struct inet6_dev *idev;
f1705ec1
DA		 3576 struct inet6_ifaddr *ifa, *tmp;
3577 struct list_head del_list;
3578 int _keep_addr;
3579 bool keep_addr;
73a8bd74 3580 int state, i;
1da177e4
LT		 3581
3582 ASSERT_RTNL();
3583
73a8bd74
DM		 3584 rt6_ifdown(net, dev);
3585 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3586
3587 idev = __in6_dev_get(dev);
63159f29 3588 if (!idev)
1da177e4
LT		 3589 return -ENODEV;
3590
bcdd553f
SH		 3591 /*
3592 * Step 1: remove reference to ipv6 device from parent device.
3593 * Do not dev_put!
1da177e4 3594 */
439e2385 3595 if (how) {
1da177e4 3596 idev->dead = 1;
8814c4b5
YH		 3597
3598 /* protected by rtnl_lock */
a9b3cd7f 3599 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3600
3601 /* Step 1.5: remove snmp6 entry */
3602 snmp6_unregister_dev(idev);
3603
3604 }
3605
f1705ec1
DA		 3606 /* aggregate the system setting and interface setting */
3607 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3608 if (!_keep_addr)
3609 _keep_addr = idev->cnf.keep_addr_on_down;
3610
3611 /* combine the user config with event to determine if permanent
3612 * addresses are to be removed from address hash table
3613 */
bc561632 3614 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
f1705ec1 3615
73a8bd74
DM		 3616 /* Step 2: clear hash table */
3617 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3618 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3619
3620 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3621restart:
b67bfe0d 3622 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3623 if (ifa->idev == idev) {
c15b1cca 3624 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3625 /* combined flag + permanent flag decide if
3626 * address is retained on a down event
3627 */
3628 if (!keep_addr ||
70af921d
DA		 3629 !(ifa->flags & IFA_F_PERMANENT) ||
3630 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3631 hlist_del_init_rcu(&ifa->addr_lst);
3632 goto restart;
3633 }
73a8bd74
DM		 3634 }
3635 }
3636 spin_unlock_bh(&addrconf_hash_lock);
3637 }
3638
1da177e4
LT		 3639 write_lock_bh(&idev->lock);
3640
b7b1bfce
HFS		 3641 addrconf_del_rs_timer(idev);
3642
bcdd553f 3643 /* Step 2: clear flags for stateless addrconf */
439e2385 3644 if (!how)
3c21edbd 3645 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3646
bcdd553f 3647 /* Step 3: clear tempaddr list */
372e6c8f 3648 while (!list_empty(&idev->tempaddr_list)) {
3649 ifa = list_first_entry(&idev->tempaddr_list,
3650 struct inet6_ifaddr, tmp_list);
3651 list_del(&ifa->tmp_list);
1da177e4
LT		 3652 write_unlock_bh(&idev->lock);
3653 spin_lock_bh(&ifa->lock);
3654
3655 if (ifa->ifpub) {
3656 in6_ifa_put(ifa->ifpub);
3657 ifa->ifpub = NULL;
3658 }
3659 spin_unlock_bh(&ifa->lock);
3660 in6_ifa_put(ifa);
3661 write_lock_bh(&idev->lock);
3662 }
8f37ada5 3663
f1705ec1
DA		 3664 /* re-combine the user config with event to determine if permanent
3665 * addresses are to be removed from the interface list
3666 */
bc561632 3667 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
84e8b803 3668
f1705ec1
DA		 3669 INIT_LIST_HEAD(&del_list);
3670 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
38bd10c4 3671 struct rt6_info *rt = NULL;
a2d6cbb0 3672 bool keep;
38bd10c4 3673
f1705ec1 3674 addrconf_del_dad_work(ifa);
84e8b803 3675
a2d6cbb0
RV		 3676 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3677 !addr_is_local(&ifa->addr);
3678 if (!keep)
3679 list_move(&ifa->if_list, &del_list);
3680
73a8bd74 3681 write_unlock_bh(&idev->lock);
8e8e676d 3682 spin_lock_bh(&ifa->lock);
f1705ec1 3683
a2d6cbb0 3684 if (keep) {
f1705ec1
DA		 3685 /* set state to skip the notifier below */
3686 state = INET6_IFADDR_STATE_DEAD;
6d717134 3687 ifa->state = INET6_IFADDR_STATE_PREDAD;
f1705ec1
DA		 3688 if (!(ifa->flags & IFA_F_NODAD))
3689 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3690
3691 rt = ifa->rt;
3692 ifa->rt = NULL;
f1705ec1
DA		 3693 } else {
3694 state = ifa->state;
3695 ifa->state = INET6_IFADDR_STATE_DEAD;
f1705ec1
DA		 3696 }
3697
8e8e676d 3698 spin_unlock_bh(&ifa->lock);
9d82ca98 3699
38bd10c4
DA		 3700 if (rt)
3701 ip6_del_rt(rt);
3702
73a8bd74
DM		 3703 if (state != INET6_IFADDR_STATE_DEAD) {
3704 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3705 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
ea06f717
MM		 3706 } else {
3707 if (idev->cnf.forwarding)
3708 addrconf_leave_anycast(ifa);
3709 addrconf_leave_solict(ifa->idev, &ifa->addr);
27bdb2ab 3710 }
8f37ada5 3711
73a8bd74
DM		 3712 write_lock_bh(&idev->lock);
3713 }
8f37ada5 3714
1da177e4
LT		 3715 write_unlock_bh(&idev->lock);
3716
f1705ec1
DA		 3717 /* now clean up addresses to be removed */
3718 while (!list_empty(&del_list)) {
3719 ifa = list_first_entry(&del_list,
3720 struct inet6_ifaddr, if_list);
3721 list_del(&ifa->if_list);
3722
3723 in6_ifa_put(ifa);
3724 }
3725
381f4dca
SD		 3726 /* Step 5: Discard anycast and multicast list */
3727 if (how) {
3728 ipv6_ac_destroy_dev(idev);
1da177e4 3729 ipv6_mc_destroy_dev(idev);
381f4dca 3730 } else {
1da177e4 3731 ipv6_mc_down(idev);
381f4dca 3732 }
1da177e4 3733
1da177e4 3734 idev->tstamp = jiffies;
1ab1457c 3735
bcdd553f 3736 /* Last: Shot the device (if unregistered) */
439e2385 3737 if (how) {
408c4768 3738 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3739 neigh_parms_release(&nd_tbl, idev->nd_parms);
3740 neigh_ifdown(&nd_tbl, dev);
3741 in6_dev_put(idev);
3742 }
3743 return 0;
3744}
3745
3746static void addrconf_rs_timer(unsigned long data)
3747{
b7b1bfce 3748 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3749 struct net_device *dev = idev->dev;
b7b1bfce 3750 struct in6_addr lladdr;
1da177e4 3751
b7b1bfce 3752 write_lock(&idev->lock);
5b2a1953 3753 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3754 goto out;
3755
9ba2add3 3756 if (!ipv6_accept_ra(idev))
5b2a1953 3757 goto out;
3758
3759 /* Announcement received after solicitation was sent */
3760 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3761 goto out;
1da177e4 3762
bd11f074 3763 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
caf92bc4
CW		 3764 write_unlock(&idev->lock);
3765 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3766 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3767 &in6addr_linklocal_allrouters);
3768 else
caf92bc4 3769 goto put;
1da177e4 3770
caf92bc4 3771 write_lock(&idev->lock);
bd11f074
MŻ		 3772 idev->rs_interval = rfc3315_s14_backoff_update(
3773 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
b7b1bfce
HFS		 3774 /* The wait after the last probe can be shorter */
3775 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3776 idev->cnf.rtr_solicits) ?
3777 idev->cnf.rtr_solicit_delay :
bd11f074 3778 idev->rs_interval);
1da177e4 3779 } else {
1da177e4
LT		 3780 /*
3781 * Note: we do not support deprecated "all on-link"
3782 * assumption any longer.
3783 */
91df42be 3784 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3785 }
3786
3787out:
b7b1bfce 3788 write_unlock(&idev->lock);
caf92bc4 3789put:
b7b1bfce 3790 in6_dev_put(idev);
1da177e4
LT		 3791}
3792
3793/*
3794 * Duplicate Address Detection
3795 */
3c21edbd
YH		 3796static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3797{
3798 unsigned long rand_num;
3799 struct inet6_dev *idev = ifp->idev;
adc176c5 3800 u64 nonce;
3c21edbd 3801
95c385b4
NH		 3802 if (ifp->flags & IFA_F_OPTIMISTIC)
3803 rand_num = 0;
3804 else
63862b5b 3805 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3806
adc176c5
EN		 3807 nonce = 0;
3808 if (idev->cnf.enhanced_dad ||
3809 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3810 do
3811 get_random_bytes(&nonce, 6);
3812 while (nonce == 0);
3813 }
3814 ifp->dad_nonce = nonce;
b7b1bfce 3815 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3816 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3817}
3818
c15b1cca 3819static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3820{
3821 struct inet6_dev *idev = ifp->idev;
3822 struct net_device *dev = idev->dev;
764d3be6 3823 bool bump_id, notify = false;
1da177e4
LT		 3824
3825 addrconf_join_solict(dev, &ifp->addr);
3826
63862b5b 3827 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3828
3829 read_lock_bh(&idev->lock);
622ccdf1 3830 spin_lock(&ifp->lock);
e9d3e084 3831 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3832 goto out;
1da177e4
LT		 3833
3834 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 3835 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3836 !(ifp->flags&IFA_F_TENTATIVE) ||
3837 ifp->flags & IFA_F_NODAD) {
764d3be6 3838 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3839 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3840 spin_unlock(&ifp->lock);
1da177e4
LT		 3841 read_unlock_bh(&idev->lock);
3842
764d3be6 3843 addrconf_dad_completed(ifp, bump_id);
1da177e4
LT		 3844 return;
3845 }
3846
6732bade 3847 if (!(idev->if_flags & IF_READY)) {
21809faf 3848 spin_unlock(&ifp->lock);
6732bade 3849 read_unlock_bh(&idev->lock);
3c21edbd 3850 /*
590a9887 3851 * If the device is not ready:
3c21edbd
YH		 3852 * - keep it tentative if it is a permanent address.
3853 * - otherwise, kill it.
3854 */
3855 in6_ifa_hold(ifp);
cc411d0b 3856 addrconf_dad_stop(ifp, 0);
6732bade 3857 return;
3c21edbd 3858 }
95c385b4
NH		 3859
3860 /*
3861 * Optimistic nodes can start receiving
3862 * Frames right away
3863 */
7fd2561e 3864 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3865 ip6_ins_rt(ifp->rt);
7fd2561e
EK		 3866 if (ipv6_use_optimistic_addr(idev)) {
3867 /* Because optimistic nodes can use this address,
3868 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3869 */
16186a82 3870 notify = true;
7fd2561e
EK		 3871 }
3872 }
95c385b4 3873
6732bade 3874 addrconf_dad_kick(ifp);
1da177e4 3875out:
622ccdf1 3876 spin_unlock(&ifp->lock);
1da177e4 3877 read_unlock_bh(&idev->lock);
16186a82
SAK		 3878 if (notify)
3879 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 3880}
3881
c15b1cca 3882static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3883{
c15b1cca
HFS		 3884 bool begin_dad = false;
3885
8e8e676d 3886 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3887 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3888 ifp->state = INET6_IFADDR_STATE_PREDAD;
3889 begin_dad = true;
3890 }
8e8e676d 3891 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3892
3893 if (begin_dad)
3894 addrconf_mod_dad_work(ifp, 0);
3895}
3896
3897static void addrconf_dad_work(struct work_struct *w)
3898{
3899 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3900 struct inet6_ifaddr,
3901 dad_work);
1da177e4 3902 struct inet6_dev *idev = ifp->idev;
764d3be6 3903 bool bump_id, disable_ipv6 = false;
1da177e4
LT		 3904 struct in6_addr mcaddr;
3905
c15b1cca
HFS		 3906 enum {
3907 DAD_PROCESS,
3908 DAD_BEGIN,
3909 DAD_ABORT,
3910 } action = DAD_PROCESS;
3911
3912 rtnl_lock();
3913
8e8e676d 3914 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3915 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3916 action = DAD_BEGIN;
3917 ifp->state = INET6_IFADDR_STATE_DAD;
3918 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3919 action = DAD_ABORT;
3920 ifp->state = INET6_IFADDR_STATE_POSTDAD;
85b51b12
MM		 3921
3922 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3923 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3924 struct in6_addr addr;
3925
3926 addr.s6_addr32[0] = htonl(0xfe800000);
3927 addr.s6_addr32[1] = 0;
3928
3929 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3930 ipv6_addr_equal(&ifp->addr, &addr)) {
3931 /* DAD failed for link-local based on MAC */
3932 idev->cnf.disable_ipv6 = 1;
3933
3934 pr_info("%s: IPv6 being disabled!\n",
3935 ifp->idev->dev->name);
3936 disable_ipv6 = true;
3937 }
3938 }
c15b1cca 3939 }
8e8e676d 3940 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3941
3942 if (action == DAD_BEGIN) {
3943 addrconf_dad_begin(ifp);
3944 goto out;
3945 } else if (action == DAD_ABORT) {
751eb6b6 3946 in6_ifa_hold(ifp);
c15b1cca 3947 addrconf_dad_stop(ifp, 1);
85b51b12
MM		 3948 if (disable_ipv6)
3949 addrconf_ifdown(idev->dev, 0);
c15b1cca
HFS		 3950 goto out;
3951 }
3952
b7b1bfce 3953 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3954 goto out;
3955
c15b1cca 3956 write_lock_bh(&idev->lock);
122e4519 3957 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3958 write_unlock_bh(&idev->lock);
1da177e4
LT		 3959 goto out;
3960 }
21809faf 3961
3962 spin_lock(&ifp->lock);
622ccdf1
HX		 3963 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3964 spin_unlock(&ifp->lock);
c15b1cca 3965 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3966 goto out;
3967 }
3968
b7b1bfce 3969 if (ifp->dad_probes == 0) {
1da177e4
LT		 3970 /*
3971 * DAD was successful
3972 */
3973
764d3be6 3974 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3975 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3976 spin_unlock(&ifp->lock);
c15b1cca 3977 write_unlock_bh(&idev->lock);
1da177e4 3978
764d3be6 3979 addrconf_dad_completed(ifp, bump_id);
1da177e4
LT		 3980
3981 goto out;
3982 }
3983
b7b1bfce 3984 ifp->dad_probes--;
c15b1cca
HFS		 3985 addrconf_mod_dad_work(ifp,
3986 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3987 spin_unlock(&ifp->lock);
c15b1cca 3988 write_unlock_bh(&idev->lock);
1da177e4
LT		 3989
3990 /* send a neighbour solicitation for our addr */
1da177e4 3991 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
adc176c5
EN		 3992 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
3993 ifp->dad_nonce);
1da177e4
LT		 3994out:
3995 in6_ifa_put(ifp);
c15b1cca 3996 rtnl_unlock();
1da177e4
LT		 3997}
3998
11ffff75
HFS		 3999/* ifp->idev must be at least read locked */
4000static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4001{
4002 struct inet6_ifaddr *ifpiter;
4003 struct inet6_dev *idev = ifp->idev;
4004
602582ca
HFS		 4005 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4006 if (ifpiter->scope > IFA_LINK)
4007 break;
11ffff75
HFS		 4008 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4009 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4010 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4011 IFA_F_PERMANENT)
4012 return false;
4013 }
4014 return true;
4015}
4016
764d3be6 4017static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id)
1da177e4 4018{
e21e8467 4019 struct net_device *dev = ifp->idev->dev;
b7b1bfce 4020 struct in6_addr lladdr;
b173ee48 4021 bool send_rs, send_mld;
b7b1bfce 4022
c15b1cca 4023 addrconf_del_dad_work(ifp);
1da177e4
LT		 4024
4025 /*
4026 * Configure the address for reception. Now it is valid.
4027 */
4028
4029 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4030
026359bc
TA		 4031 /* If added prefix is link local and we are prepared to process
4032 router advertisements, start sending router solicitations.
1da177e4
LT		 4033 */
4034
1ec047eb 4035 read_lock_bh(&ifp->idev->lock);
11ffff75 4036 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 4037 send_rs = send_mld &&
4038 ipv6_accept_ra(ifp->idev) &&
bd11f074 4039 ifp->idev->cnf.rtr_solicits != 0 &&
b173ee48 4040 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 4041 read_unlock_bh(&ifp->idev->lock);
4042
b173ee48
HFS		 4043 /* While dad is in progress mld report's source address is in6_addrany.
4044 * Resend with proper ll now.
4045 */
4046 if (send_mld)
4047 ipv6_mc_dad_complete(ifp->idev);
4048
1ec047eb 4049 if (send_rs) {
1da177e4
LT		 4050 /*
4051 * If a host as already performed a random delay
4052 * [...] as part of DAD [...] there is no need
4053 * to delay again before sending the first RS
4054 */
1ec047eb 4055 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 4056 return;
1ec047eb 4057 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 4058
b7b1bfce
HFS		 4059 write_lock_bh(&ifp->idev->lock);
4060 spin_lock(&ifp->lock);
bd11f074
MŻ		 4061 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4062 ifp->idev->cnf.rtr_solicit_interval);
b7b1bfce 4063 ifp->idev->rs_probes = 1;
1da177e4 4064 ifp->idev->if_flags |= IF_RS_SENT;
bd11f074 4065 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
b7b1bfce
HFS		 4066 spin_unlock(&ifp->lock);
4067 write_unlock_bh(&ifp->idev->lock);
1da177e4 4068 }
764d3be6
PA		 4069
4070 if (bump_id)
4071 rt_genid_bump_ipv6(dev_net(dev));
a11a7f71
MH		 4072
4073 /* Make sure that a new temporary address will be created
4074 * before this temporary address becomes deprecated.
4075 */
4076 if (ifp->flags & IFA_F_TEMPORARY)
4077 addrconf_verify_rtnl();
1da177e4
LT		 4078}
4079
e21e8467
SH		 4080static void addrconf_dad_run(struct inet6_dev *idev)
4081{
c5e33bdd
YH		 4082 struct inet6_ifaddr *ifp;
4083
4084 read_lock_bh(&idev->lock);
502a2ffd 4085 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 4086 spin_lock(&ifp->lock);
f2344a13
HX		 4087 if (ifp->flags & IFA_F_TENTATIVE &&
4088 ifp->state == INET6_IFADDR_STATE_DAD)
4089 addrconf_dad_kick(ifp);
21809faf 4090 spin_unlock(&ifp->lock);
c5e33bdd
YH		 4091 }
4092 read_unlock_bh(&idev->lock);
4093}
4094
1da177e4
LT		 4095#ifdef CONFIG_PROC_FS
4096struct if6_iter_state {
3c40090a 4097 struct seq_net_private p;
1da177e4 4098 int bucket;
1d578303 4099 int offset;
1da177e4
LT		 4100};
4101
1d578303 4102static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 4103{
4104 struct inet6_ifaddr *ifa = NULL;
4105 struct if6_iter_state *state = seq->private;
1218854a 4106 struct net *net = seq_file_net(seq);
1d578303 4107 int p = 0;
1da177e4 4108
1d578303
MM		 4109 /* initial bucket if pos is 0 */
4110 if (pos == 0) {
4111 state->bucket = 0;
4112 state->offset = 0;
4113 }
4114
4115 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 4116 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 4117 addr_lst) {
9f0d3c27
ED		 4118 if (!net_eq(dev_net(ifa->idev->dev), net))
4119 continue;
1d578303
MM		 4120 /* sync with offset */
4121 if (p < state->offset) {
4122 p++;
4123 continue;
4124 }
4125 state->offset++;
9f0d3c27 4126 return ifa;
1d578303
MM		 4127 }
4128
4129 /* prepare for next bucket */
4130 state->offset = 0;
4131 p = 0;
1da177e4 4132 }
c2e21293 4133 return NULL;
1da177e4
LT		 4134}
4135
c2e21293 4136static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4137 struct inet6_ifaddr *ifa)
1da177e4
LT		 4138{
4139 struct if6_iter_state *state = seq->private;
1218854a 4140 struct net *net = seq_file_net(seq);
1da177e4 4141
b67bfe0d 4142 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 4143 if (!net_eq(dev_net(ifa->idev->dev), net))
4144 continue;
1d578303 4145 state->offset++;
9f0d3c27 4146 return ifa;
1d578303 4147 }
3c40090a 4148
c2e21293 4149 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 4150 state->offset = 0;
b67bfe0d 4151 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 4152 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 4153 if (!net_eq(dev_net(ifa->idev->dev), net))
4154 continue;
1d578303 4155 state->offset++;
9f0d3c27 4156 return ifa;
c2e21293 4157 }
1da177e4 4158 }
3c40090a 4159
c2e21293 4160 return NULL;
1da177e4
LT		 4161}
4162
1da177e4 4163static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 4164 __acquires(rcu_bh)
1da177e4 4165{
5c578aed 4166 rcu_read_lock_bh();
1d578303 4167 return if6_get_first(seq, *pos);
1da177e4
LT		 4168}
4169
4170static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4171{
4172 struct inet6_ifaddr *ifa;
4173
4174 ifa = if6_get_next(seq, v);
4175 ++*pos;
4176 return ifa;
4177}
4178
4179static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 4180 __releases(rcu_bh)
1da177e4 4181{
5c578aed 4182 rcu_read_unlock_bh();
1da177e4
LT		 4183}
4184
4185static int if6_seq_show(struct seq_file *seq, void *v)
4186{
4187 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4188 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4189 &ifp->addr,
1da177e4
LT		 4190 ifp->idev->dev->ifindex,
4191 ifp->prefix_len,
4192 ifp->scope,
971a351c 4193 (u8) ifp->flags,
1da177e4
LT		 4194 ifp->idev->dev->name);
4195 return 0;
4196}
4197
56b3d975 4198static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4199 .start = if6_seq_start,
4200 .next = if6_seq_next,
4201 .show = if6_seq_show,
4202 .stop = if6_seq_stop,
4203};
4204
4205static int if6_seq_open(struct inode *inode, struct file *file)
4206{
3c40090a
DL		 4207 return seq_open_net(inode, file, &if6_seq_ops,
4208 sizeof(struct if6_iter_state));
1da177e4
LT		 4209}
4210
9a32144e 4211static const struct file_operations if6_fops = {
1da177e4
LT		 4212 .owner = THIS_MODULE,
4213 .open = if6_seq_open,
4214 .read = seq_read,
4215 .llseek = seq_lseek,
3c40090a 4216 .release = seq_release_net,
1da177e4
LT		 4217};
4218
2c8c1e72 4219static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4220{
d4beaa66 4221 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 4222 return -ENOMEM;
4223 return 0;
4224}
4225
2c8c1e72 4226static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4227{
ece31ffd 4228 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4229}
4230
4231static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4232 .init = if6_proc_net_init,
4233 .exit = if6_proc_net_exit,
3c40090a
DL		 4234};
4235
4236int __init if6_proc_init(void)
4237{
4238 return register_pernet_subsys(&if6_proc_net_ops);
4239}
4240
1da177e4
LT		 4241void if6_proc_exit(void)
4242{
3c40090a 4243 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4244}
4245#endif /* CONFIG_PROC_FS */
4246
07a93626 4247#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4248/* Check if address is a home address configured on any interface. */
b71d1d42 4249int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 4250{
4251 int ret = 0;
c2e21293 4252 struct inet6_ifaddr *ifp = NULL;
ddbe5032 4253 unsigned int hash = inet6_addr_hash(addr);
c2e21293 4254
5c578aed 4255 rcu_read_lock_bh();
b67bfe0d 4256 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 4257 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 4258 continue;
caad295f 4259 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4260 (ifp->flags & IFA_F_HOMEADDRESS)) {
4261 ret = 1;
4262 break;
4263 }
4264 }
5c578aed 4265 rcu_read_unlock_bh();
3b9f9a1c
NT		 4266 return ret;
4267}
4268#endif
4269
1da177e4
LT		 4270/*
4271 * Periodic address status verification
4272 */
4273
c15b1cca 4274static void addrconf_verify_rtnl(void)
1da177e4 4275{
b2db7564 4276 unsigned long now, next, next_sec, next_sched;
1da177e4 4277 struct inet6_ifaddr *ifp;
1da177e4
LT		 4278 int i;
4279
c15b1cca
HFS		 4280 ASSERT_RTNL();
4281
5c578aed 4282 rcu_read_lock_bh();
1da177e4 4283 now = jiffies;
b2db7564 4284 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4285
c15b1cca 4286 cancel_delayed_work(&addr_chk_work);
1da177e4 4287
bcdd553f 4288 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4289restart:
c15b1cca 4290 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 4291 unsigned long age;
1da177e4 4292
fad8da3e
YA		 4293 /* When setting preferred_lft to a value not zero or
4294 * infinity, while valid_lft is infinity
4295 * IFA_F_PERMANENT has a non-infinity life time.
4296 */
4297 if ((ifp->flags & IFA_F_PERMANENT) &&
4298 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4299 continue;
4300
4301 spin_lock(&ifp->lock);
b2db7564
YH		 4302 /* We try to batch several events at once. */
4303 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4304
8f27ebb9
YH		 4305 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4306 age >= ifp->valid_lft) {
1da177e4
LT		 4307 spin_unlock(&ifp->lock);
4308 in6_ifa_hold(ifp);
1da177e4
LT		 4309 ipv6_del_addr(ifp);
4310 goto restart;
8f27ebb9
YH		 4311 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4312 spin_unlock(&ifp->lock);
4313 continue;
1da177e4 4314 } else if (age >= ifp->prefered_lft) {
a1ed0526 4315 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4316 int deprecate = 0;
4317
4318 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4319 deprecate = 1;
4320 ifp->flags |= IFA_F_DEPRECATED;
4321 }
4322
fad8da3e
YA		 4323 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4324 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4325 next = ifp->tstamp + ifp->valid_lft * HZ;
4326
4327 spin_unlock(&ifp->lock);
4328
4329 if (deprecate) {
4330 in6_ifa_hold(ifp);
1da177e4
LT		 4331
4332 ipv6_ifa_notify(0, ifp);
4333 in6_ifa_put(ifp);
4334 goto restart;
4335 }
1da177e4
LT		 4336 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4337 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4338 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4339 ifp->idev->cnf.dad_transmits *
1f9248e5 4340 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 4341
1da177e4
LT		 4342 if (age >= ifp->prefered_lft - regen_advance) {
4343 struct inet6_ifaddr *ifpub = ifp->ifpub;
4344 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4345 next = ifp->tstamp + ifp->prefered_lft * HZ;
4346 if (!ifp->regen_count && ifpub) {
4347 ifp->regen_count++;
4348 in6_ifa_hold(ifp);
4349 in6_ifa_hold(ifpub);
4350 spin_unlock(&ifp->lock);
5c578aed 4351
291d809b
HY		 4352 spin_lock(&ifpub->lock);
4353 ifpub->regen_count = 0;
4354 spin_unlock(&ifpub->lock);
1da177e4
LT		 4355 ipv6_create_tempaddr(ifpub, ifp);
4356 in6_ifa_put(ifpub);
4357 in6_ifa_put(ifp);
4358 goto restart;
4359 }
4360 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4361 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4362 spin_unlock(&ifp->lock);
1da177e4
LT		 4363 } else {
4364 /* ifp->prefered_lft <= ifp->valid_lft */
4365 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4366 next = ifp->tstamp + ifp->prefered_lft * HZ;
4367 spin_unlock(&ifp->lock);
4368 }
4369 }
1da177e4
LT		 4370 }
4371
b2db7564
YH		 4372 next_sec = round_jiffies_up(next);
4373 next_sched = next;
4374
4375 /* If rounded timeout is accurate enough, accept it. */
4376 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4377 next_sched = next_sec;
4378
4379 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4380 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4381 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4382
ba3542e1 4383 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4384 now, next, next_sec, next_sched);
c15b1cca 4385 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4386 rcu_read_unlock_bh();
1da177e4
LT		 4387}
4388
c15b1cca
HFS		 4389static void addrconf_verify_work(struct work_struct *w)
4390{
4391 rtnl_lock();
4392 addrconf_verify_rtnl();
4393 rtnl_unlock();
4394}
4395
4396static void addrconf_verify(void)
4397{
4398 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4399}
4400
caeaba79
ND		 4401static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4402 struct in6_addr **peer_pfx)
461d8837
TG		 4403{
4404 struct in6_addr *pfx = NULL;
4405
caeaba79
ND		 4406 *peer_pfx = NULL;
4407
461d8837
TG		 4408 if (addr)
4409 pfx = nla_data(addr);
4410
4411 if (local) {
4412 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4413 *peer_pfx = pfx;
4414 pfx = nla_data(local);
461d8837
TG		 4415 }
4416
4417 return pfx;
4418}
4419
ef7c79ed 4420static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4421 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4422 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4423 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4424 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 4425};
4426
1da177e4 4427static int
c21ef3e3
DA		 4428inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4429 struct netlink_ext_ack *extack)
1da177e4 4430{
3b1e0a65 4431 struct net *net = sock_net(skb->sk);
b933f716
TG		 4432 struct ifaddrmsg *ifm;
4433 struct nlattr *tb[IFA_MAX+1];
caeaba79 4434 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4435 u32 ifa_flags;
b933f716 4436 int err;
1da177e4 4437
fceb6435 4438 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4439 extack);
b933f716
TG		 4440 if (err < 0)
4441 return err;
4442
4443 ifm = nlmsg_data(nlh);
caeaba79 4444 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4445 if (!pfx)
1da177e4
LT		 4446 return -EINVAL;
4447
6046d5b4
HK		 4448 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4449
4450 /* We ignore other flags so far. */
4451 ifa_flags &= IFA_F_MANAGETEMPADDR;
4452
4453 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4454 ifm->ifa_prefixlen);
1da177e4
LT		 4455}
4456
479840ff 4457static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 4458 u32 prefered_lft, u32 valid_lft)
081bba5b 4459{
6f704992
YH		 4460 u32 flags;
4461 clock_t expires;
4bed72e4 4462 unsigned long timeout;
53bd6749 4463 bool was_managetempaddr;
5b84efec 4464 bool had_prefixroute;
46d48046 4465
c15b1cca
HFS		 4466 ASSERT_RTNL();
4467
081bba5b
NT		 4468 if (!valid_lft || (prefered_lft > valid_lft))
4469 return -EINVAL;
4470
53bd6749
JP		 4471 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4472 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4473 return -EINVAL;
4474
4bed72e4
YH		 4475 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4476 if (addrconf_finite_timeout(timeout)) {
4477 expires = jiffies_to_clock_t(timeout * HZ);
4478 valid_lft = timeout;
6f704992 4479 flags = RTF_EXPIRES;
4bed72e4
YH		 4480 } else {
4481 expires = 0;
4482 flags = 0;
4483 ifa_flags |= IFA_F_PERMANENT;
6f704992 4484 }
081bba5b 4485
4bed72e4
YH		 4486 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4487 if (addrconf_finite_timeout(timeout)) {
4488 if (timeout == 0)
4489 ifa_flags |= IFA_F_DEPRECATED;
4490 prefered_lft = timeout;
4491 }
081bba5b
NT		 4492
4493 spin_lock_bh(&ifp->lock);
53bd6749 4494 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4495 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4496 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4497 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4498 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4499 IFA_F_NOPREFIXROUTE);
53bd6749 4500 ifp->flags |= ifa_flags;
081bba5b
NT		 4501 ifp->tstamp = jiffies;
4502 ifp->valid_lft = valid_lft;
4503 ifp->prefered_lft = prefered_lft;
4504
4505 spin_unlock_bh(&ifp->lock);
4506 if (!(ifp->flags&IFA_F_TENTATIVE))
4507 ipv6_ifa_notify(0, ifp);
081bba5b 4508
761aac73
TH		 4509 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4510 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4511 expires, flags);
5b84efec
TH		 4512 } else if (had_prefixroute) {
4513 enum cleanup_prefix_rt_t action;
4514 unsigned long rt_expires;
4515
4516 write_lock_bh(&ifp->idev->lock);
4517 action = check_cleanup_prefix_route(ifp, &rt_expires);
4518 write_unlock_bh(&ifp->idev->lock);
4519
4520 if (action != CLEANUP_PREFIX_RT_NOP) {
4521 cleanup_prefix_route(ifp, rt_expires,
4522 action == CLEANUP_PREFIX_RT_DEL);
4523 }
761aac73 4524 }
53bd6749
JP		 4525
4526 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4527 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4528 valid_lft = prefered_lft = 0;
4529 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4530 !was_managetempaddr, jiffies);
4531 }
4532
c15b1cca 4533 addrconf_verify_rtnl();
081bba5b
NT		 4534
4535 return 0;
4536}
4537
1da177e4 4538static int
c21ef3e3
DA		 4539inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4540 struct netlink_ext_ack *extack)
1da177e4 4541{
3b1e0a65 4542 struct net *net = sock_net(skb->sk);
461d8837
TG		 4543 struct ifaddrmsg *ifm;
4544 struct nlattr *tb[IFA_MAX+1];
caeaba79 4545 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 4546 struct inet6_ifaddr *ifa;
4547 struct net_device *dev;
55ebaef1 4548 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 4549 u32 ifa_flags;
461d8837 4550 int err;
1da177e4 4551
fceb6435 4552 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4553 extack);
461d8837
TG		 4554 if (err < 0)
4555 return err;
4556
4557 ifm = nlmsg_data(nlh);
caeaba79 4558 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4559 if (!pfx)
1da177e4
LT		 4560 return -EINVAL;
4561
461d8837 4562 if (tb[IFA_CACHEINFO]) {
0778769d 4563 struct ifa_cacheinfo *ci;
461d8837
TG		 4564
4565 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 4566 valid_lft = ci->ifa_valid;
461d8837
TG		 4567 preferred_lft = ci->ifa_prefered;
4568 } else {
4569 preferred_lft = INFINITY_LIFE_TIME;
4570 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 4571 }
4572
af284937 4573 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4574 if (!dev)
7198f8ce
TG		 4575 return -ENODEV;
4576
479840ff
JP		 4577 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4578
55ebaef1 4579 /* We ignore other flags so far. */
761aac73 4580 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
93a714d6 4581 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
55ebaef1 4582
1cab3da6 4583 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
63159f29 4584 if (!ifa) {
7198f8ce
TG		 4585 /*
4586 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4587 * userspace already relies on not having to provide this.
7198f8ce 4588 */
caeaba79 4589 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 4590 ifm->ifa_prefixlen, ifa_flags,
4591 preferred_lft, valid_lft);
081bba5b
NT		 4592 }
4593
7198f8ce
TG		 4594 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4595 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4596 err = -EEXIST;
4597 else
55ebaef1 4598 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 4599
4600 in6_ifa_put(ifa);
4601
4602 return err;
1da177e4
LT		 4603}
4604
479840ff 4605static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4606 u8 scope, int ifindex)
4607{
4608 struct ifaddrmsg *ifm;
4609
4610 ifm = nlmsg_data(nlh);
4611 ifm->ifa_family = AF_INET6;
4612 ifm->ifa_prefixlen = prefixlen;
4613 ifm->ifa_flags = flags;
4614 ifm->ifa_scope = scope;
4615 ifm->ifa_index = ifindex;
4616}
4617
85486af0
TG		 4618static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4619 unsigned long tstamp, u32 preferred, u32 valid)
4620{
4621 struct ifa_cacheinfo ci;
4622
18a31e1e
TG		 4623 ci.cstamp = cstamp_delta(cstamp);
4624 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4625 ci.ifa_prefered = preferred;
4626 ci.ifa_valid = valid;
4627
4628 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4629}
4630
101bb229
TG		 4631static inline int rt_scope(int ifa_scope)
4632{
4633 if (ifa_scope & IFA_HOST)
4634 return RT_SCOPE_HOST;
4635 else if (ifa_scope & IFA_LINK)
4636 return RT_SCOPE_LINK;
4637 else if (ifa_scope & IFA_SITE)
4638 return RT_SCOPE_SITE;
4639 else
4640 return RT_SCOPE_UNIVERSE;
4641}
4642
0ab6803b
TG		 4643static inline int inet6_ifaddr_msgsize(void)
4644{
339bf98f 4645 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4646 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4647 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4648 + nla_total_size(sizeof(struct ifa_cacheinfo))
4649 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4650}
c5396a31 4651
1da177e4 4652static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4653 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4654{
1da177e4 4655 struct nlmsghdr *nlh;
85486af0 4656 u32 preferred, valid;
1da177e4 4657
15e47304 4658 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4659 if (!nlh)
26932566 4660 return -EMSGSIZE;
0ab6803b 4661
101bb229
TG		 4662 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4663 ifa->idev->dev->ifindex);
4664
fad8da3e
YA		 4665 if (!((ifa->flags&IFA_F_PERMANENT) &&
4666 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4667 preferred = ifa->prefered_lft;
4668 valid = ifa->valid_lft;
4669 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4670 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4671 if (preferred > tval)
4672 preferred -= tval;
4673 else
4674 preferred = 0;
f56619fc
BH		 4675 if (valid != INFINITY_LIFE_TIME) {
4676 if (valid > tval)
4677 valid -= tval;
4678 else
4679 valid = 0;
4680 }
1da177e4
LT		 4681 }
4682 } else {
85486af0
TG		 4683 preferred = INFINITY_LIFE_TIME;
4684 valid = INFINITY_LIFE_TIME;
4685 }
4686
7996c799 4687 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4688 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4689 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4690 goto error;
4691 } else
930345ea 4692 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4693 goto error;
4694
4695 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4696 goto error;
1da177e4 4697
479840ff
JP		 4698 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4699 goto error;
4700
053c095a
JB		 4701 nlmsg_end(skb, nlh);
4702 return 0;
caeaba79
ND		 4703
4704error:
4705 nlmsg_cancel(skb, nlh);
4706 return -EMSGSIZE;
1da177e4
LT		 4707}
4708
4709static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4710 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4711{
1da177e4 4712 struct nlmsghdr *nlh;
101bb229
TG		 4713 u8 scope = RT_SCOPE_UNIVERSE;
4714 int ifindex = ifmca->idev->dev->ifindex;
4715
4716 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4717 scope = RT_SCOPE_SITE;
1da177e4 4718
15e47304 4719 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4720 if (!nlh)
26932566 4721 return -EMSGSIZE;
85486af0 4722
0ab6803b 4723 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4724 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4725 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4726 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4727 nlmsg_cancel(skb, nlh);
4728 return -EMSGSIZE;
4729 }
85486af0 4730
053c095a
JB		 4731 nlmsg_end(skb, nlh);
4732 return 0;
1da177e4
LT		 4733}
4734
4735static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4736 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4737{
1da177e4 4738 struct nlmsghdr *nlh;
101bb229
TG		 4739 u8 scope = RT_SCOPE_UNIVERSE;
4740 int ifindex = ifaca->aca_idev->dev->ifindex;
4741
4742 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4743 scope = RT_SCOPE_SITE;
1da177e4 4744
15e47304 4745 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4746 if (!nlh)
26932566 4747 return -EMSGSIZE;
85486af0 4748
0ab6803b 4749 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4750 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4751 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4752 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4753 nlmsg_cancel(skb, nlh);
4754 return -EMSGSIZE;
4755 }
1da177e4 4756
053c095a
JB		 4757 nlmsg_end(skb, nlh);
4758 return 0;
1da177e4
LT		 4759}
4760
e21e8467 4761enum addr_type_t {
1da177e4
LT		 4762 UNICAST_ADDR,
4763 MULTICAST_ADDR,
4764 ANYCAST_ADDR,
4765};
4766
234b27c3
ED		 4767/* called with rcu_read_lock() */
4768static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4769 struct netlink_callback *cb, enum addr_type_t type,
4770 int s_ip_idx, int *p_ip_idx)
4771{
234b27c3
ED		 4772 struct ifmcaddr6 *ifmca;
4773 struct ifacaddr6 *ifaca;
4774 int err = 1;
4775 int ip_idx = *p_ip_idx;
4776
4777 read_lock_bh(&idev->lock);
4778 switch (type) {
502a2ffd 4779 case UNICAST_ADDR: {
4780 struct inet6_ifaddr *ifa;
4781
234b27c3 4782 /* unicast address incl. temp addr */
502a2ffd 4783 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4784 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4785 continue;
4786 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4787 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4788 cb->nlh->nlmsg_seq,
4789 RTM_NEWADDR,
4790 NLM_F_MULTI);
053c095a 4791 if (err < 0)
234b27c3 4792 break;
63998ac2 4793 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4794 }
4795 break;
502a2ffd 4796 }
234b27c3
ED		 4797 case MULTICAST_ADDR:
4798 /* multicast address */
4799 for (ifmca = idev->mc_list; ifmca;
4800 ifmca = ifmca->next, ip_idx++) {
4801 if (ip_idx < s_ip_idx)
4802 continue;
4803 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4804 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4805 cb->nlh->nlmsg_seq,
4806 RTM_GETMULTICAST,
4807 NLM_F_MULTI);
053c095a 4808 if (err < 0)
234b27c3
ED		 4809 break;
4810 }
4811 break;
4812 case ANYCAST_ADDR:
4813 /* anycast address */
4814 for (ifaca = idev->ac_list; ifaca;
4815 ifaca = ifaca->aca_next, ip_idx++) {
4816 if (ip_idx < s_ip_idx)
4817 continue;
4818 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4819 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4820 cb->nlh->nlmsg_seq,
4821 RTM_GETANYCAST,
4822 NLM_F_MULTI);
053c095a 4823 if (err < 0)
234b27c3
ED		 4824 break;
4825 }
4826 break;
4827 default:
4828 break;
4829 }
4830 read_unlock_bh(&idev->lock);
4831 *p_ip_idx = ip_idx;
4832 return err;
4833}
4834
1da177e4
LT		 4835static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4836 enum addr_type_t type)
4837{
234b27c3
ED		 4838 struct net *net = sock_net(skb->sk);
4839 int h, s_h;
1da177e4
LT		 4840 int idx, ip_idx;
4841 int s_idx, s_ip_idx;
1da177e4 4842 struct net_device *dev;
234b27c3
ED		 4843 struct inet6_dev *idev;
4844 struct hlist_head *head;
1ab1457c 4845
234b27c3
ED		 4846 s_h = cb->args[0];
4847 s_idx = idx = cb->args[1];
4848 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4849
234b27c3 4850 rcu_read_lock();
63998ac2 4851 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4852 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4853 idx = 0;
4854 head = &net->dev_index_head[h];
b67bfe0d 4855 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4856 if (idx < s_idx)
4857 goto cont;
4b97efdf 4858 if (h > s_h || idx > s_idx)
234b27c3
ED		 4859 s_ip_idx = 0;
4860 ip_idx = 0;
e21e8467
SH		 4861 idev = __in6_dev_get(dev);
4862 if (!idev)
234b27c3
ED		 4863 goto cont;
4864
4865 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4866 s_ip_idx, &ip_idx) < 0)
234b27c3 4867 goto done;
7562f876 4868cont:
234b27c3
ED		 4869 idx++;
4870 }
1da177e4 4871 }
234b27c3
ED		 4872done:
4873 rcu_read_unlock();
4874 cb->args[0] = h;
4875 cb->args[1] = idx;
4876 cb->args[2] = ip_idx;
4877
1da177e4
LT		 4878 return skb->len;
4879}
4880
4881static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4882{
4883 enum addr_type_t type = UNICAST_ADDR;
b854272b 4884
1da177e4
LT		 4885 return inet6_dump_addr(skb, cb, type);
4886}
4887
4888static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4889{
4890 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4891
1da177e4
LT		 4892 return inet6_dump_addr(skb, cb, type);
4893}
4894
4895
4896static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4897{
4898 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4899
1da177e4
LT		 4900 return inet6_dump_addr(skb, cb, type);
4901}
4902
c21ef3e3
DA		 4903static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4904 struct netlink_ext_ack *extack)
6c223828 4905{
3b1e0a65 4906 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4907 struct ifaddrmsg *ifm;
4908 struct nlattr *tb[IFA_MAX+1];
caeaba79 4909 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4910 struct net_device *dev = NULL;
4911 struct inet6_ifaddr *ifa;
4912 struct sk_buff *skb;
6c223828
NT		 4913 int err;
4914
fceb6435 4915 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4916 extack);
1b29fc2c
TG		 4917 if (err < 0)
4918 goto errout;
4919
caeaba79 4920 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
63159f29 4921 if (!addr) {
1b29fc2c
TG		 4922 err = -EINVAL;
4923 goto errout;
6c223828 4924 }
6c223828 4925
1b29fc2c 4926 ifm = nlmsg_data(nlh);
6c223828 4927 if (ifm->ifa_index)
6fda7350 4928 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4929
e21e8467
SH		 4930 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4931 if (!ifa) {
1b29fc2c
TG		 4932 err = -EADDRNOTAVAIL;
4933 goto errout;
4934 }
6c223828 4935
e21e8467
SH		 4936 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4937 if (!skb) {
6c223828 4938 err = -ENOBUFS;
1b29fc2c 4939 goto errout_ifa;
6c223828
NT		 4940 }
4941
15e47304 4942 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4943 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4944 if (err < 0) {
4945 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4946 WARN_ON(err == -EMSGSIZE);
4947 kfree_skb(skb);
4948 goto errout_ifa;
4949 }
15e47304 4950 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4951errout_ifa:
6c223828 4952 in6_ifa_put(ifa);
1b29fc2c 4953errout:
6c223828 4954 return err;
6c223828
NT		 4955}
4956
1da177e4
LT		 4957static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4958{
4959 struct sk_buff *skb;
c346dca1 4960 struct net *net = dev_net(ifa->idev->dev);
5d620266 4961 int err = -ENOBUFS;
1da177e4 4962
f784ad3d
MB		 4963 /* Don't send DELADDR notification for TENTATIVE address,
4964 * since NEWADDR notification is sent only after removing
4965 * TENTATIVE flag.
4966 */
4967 if (ifa->flags & IFA_F_TENTATIVE && event == RTM_DELADDR)
4968 return;
4969
0ab6803b 4970 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 4971 if (!skb)
5d620266
TG		 4972 goto errout;
4973
4974 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4975 if (err < 0) {
4976 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4977 WARN_ON(err == -EMSGSIZE);
4978 kfree_skb(skb);
4979 goto errout;
4980 }
1ce85fe4
PNA		 4981 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4982 return;
5d620266
TG		 4983errout:
4984 if (err < 0)
6fda7350 4985 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4986}
4987
b6f99a21 4988static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4989 __s32 *array, int bytes)
4990{
04561c1f
TG		 4991 BUG_ON(bytes < (DEVCONF_MAX * 4));
4992
1da177e4
LT		 4993 memset(array, 0, bytes);
4994 array[DEVCONF_FORWARDING] = cnf->forwarding;
4995 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4996 array[DEVCONF_MTU6] = cnf->mtu6;
4997 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4998 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4999 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5000 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5001 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 5002 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5003 jiffies_to_msecs(cnf->rtr_solicit_interval);
bd11f074
MŻ		 5004 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5005 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
93908d19
TG		 5006 array[DEVCONF_RTR_SOLICIT_DELAY] =
5007 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 5008 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 5009 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5010 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5011 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5012 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 5013 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5014 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5015 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5016 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5017 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 5018 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 5019 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 5020 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 5021 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 5022#ifdef CONFIG_IPV6_ROUTER_PREF
5023 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 5024 array[DEVCONF_RTR_PROBE_INTERVAL] =
5025 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 5026#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 5027 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
09c884d4
YH		 5028 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5029#endif
930d6ff2 5030#endif
fbea49e1 5031 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 5032 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 5033#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5034 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 5035 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 5036#endif
7bc570c8
YH		 5037#ifdef CONFIG_IPV6_MROUTE
5038 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5039#endif
778d80be 5040 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 5041 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 5042 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 5043 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 5044 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 5045 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 5046 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 5047 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 5048 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 5049 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 5050 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 5051 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 5052 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1ababeba 5053 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
bf355b8d
DL		 5054#ifdef CONFIG_IPV6_SEG6_HMAC
5055 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5056#endif
adc176c5 5057 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
d35a00b8 5058 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
df789fe7 5059 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
1da177e4
LT		 5060}
5061
b382b191
TG		 5062static inline size_t inet6_ifla6_size(void)
5063{
5064 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5065 + nla_total_size(sizeof(struct ifla_cacheinfo))
5066 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5067 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 5068 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5069 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 5070}
5071
339bf98f
TG		 5072static inline size_t inet6_if_nlmsg_size(void)
5073{
5074 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5075 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5076 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5077 + nla_total_size(4) /* IFLA_MTU */
5078 + nla_total_size(4) /* IFLA_LINK */
0344338b 5079 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 5080 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 5081}
c5396a31 5082
be281e55 5083static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
aca05671 5084 int bytes)
7f7d9a6b
HX		 5085{
5086 int i;
aca05671 5087 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
7f7d9a6b
HX		 5088 BUG_ON(pad < 0);
5089
5090 /* Use put_unaligned() because stats may not be aligned for u64. */
aca05671
JH		 5091 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5092 for (i = 1; i < ICMP6_MIB_MAX; i++)
be281e55 5093 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b 5094
aca05671 5095 memset(&stats[ICMP6_MIB_MAX], 0, pad);
7f7d9a6b
HX		 5096}
5097
698365fa 5098static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 5099 int bytes, size_t syncpoff)
4ce3c183 5100{
a3a77372
R		 5101 int i, c;
5102 u64 buff[IPSTATS_MIB_MAX];
5103 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5104
4ce3c183
ED		 5105 BUG_ON(pad < 0);
5106
a3a77372
R		 5107 memset(buff, 0, sizeof(buff));
5108 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 5109
a3a77372
R		 5110 for_each_possible_cpu(c) {
5111 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5112 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5113 }
5114
5115 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5116 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 5117}
5118
7f7d9a6b
HX		 5119static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5120 int bytes)
5121{
e21e8467 5122 switch (attrtype) {
7f7d9a6b 5123 case IFLA_INET6_STATS:
a3a77372
R		 5124 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5125 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 5126 break;
5127 case IFLA_INET6_ICMP6STATS:
aca05671 5128 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
7f7d9a6b
HX		 5129 break;
5130 }
5131}
5132
d5566fd7
SV		 5133static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5134 u32 ext_filter_mask)
b382b191
TG		 5135{
5136 struct nlattr *nla;
5137 struct ifla_cacheinfo ci;
5138
c78679e8
DM		 5139 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5140 goto nla_put_failure;
b382b191 5141 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 5142 ci.tstamp = cstamp_delta(idev->tstamp);
5143 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 5144 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 5145 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5146 goto nla_put_failure;
b382b191 5147 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 5148 if (!nla)
b382b191
TG		 5149 goto nla_put_failure;
5150 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5151
5152 /* XXX - MC not implemented */
5153
d5566fd7
SV		 5154 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5155 return 0;
5156
b382b191 5157 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 5158 if (!nla)
b382b191
TG		 5159 goto nla_put_failure;
5160 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5161
5162 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_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_ICMP6STATS, nla_len(nla));
5166
f53adae4 5167 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 5168 if (!nla)
f53adae4 5169 goto nla_put_failure;
bc91b0f0 5170
d35a00b8 5171 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
bc91b0f0
JP		 5172 goto nla_put_failure;
5173
f53adae4
DB		 5174 read_lock_bh(&idev->lock);
5175 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5176 read_unlock_bh(&idev->lock);
5177
b382b191
TG		 5178 return 0;
5179
5180nla_put_failure:
5181 return -EMSGSIZE;
5182}
5183
b1974ed0
AR		 5184static size_t inet6_get_link_af_size(const struct net_device *dev,
5185 u32 ext_filter_mask)
b382b191
TG		 5186{
5187 if (!__in6_dev_get(dev))
5188 return 0;
5189
5190 return inet6_ifla6_size();
5191}
5192
d5566fd7
SV		 5193static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5194 u32 ext_filter_mask)
b382b191
TG		 5195{
5196 struct inet6_dev *idev = __in6_dev_get(dev);
5197
5198 if (!idev)
5199 return -ENODATA;
5200
d5566fd7 5201 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5202 return -EMSGSIZE;
5203
5204 return 0;
5205}
5206
f53adae4
DB		 5207static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5208{
f53adae4
DB		 5209 struct inet6_ifaddr *ifp;
5210 struct net_device *dev = idev->dev;
47e27d5e 5211 bool clear_token, update_rs = false;
dc848292 5212 struct in6_addr ll_addr;
f53adae4 5213
c15b1cca
HFS		 5214 ASSERT_RTNL();
5215
63159f29 5216 if (!token)
f53adae4 5217 return -EINVAL;
f53adae4
DB		 5218 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5219 return -EINVAL;
f53adae4
DB		 5220 if (!ipv6_accept_ra(idev))
5221 return -EINVAL;
bd11f074 5222 if (idev->cnf.rtr_solicits == 0)
f53adae4
DB		 5223 return -EINVAL;
5224
5225 write_lock_bh(&idev->lock);
5226
5227 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5228 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5229
5230 write_unlock_bh(&idev->lock);
5231
47e27d5e
DB		 5232 clear_token = ipv6_addr_any(token);
5233 if (clear_token)
5234 goto update_lft;
5235
dc848292
HFS		 5236 if (!idev->dead && (idev->if_flags & IF_READY) &&
5237 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5238 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5239 /* If we're not ready, then normal ifup will take care
5240 * of this. Otherwise, we need to request our rs here.
5241 */
5242 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5243 update_rs = true;
5244 }
f53adae4 5245
47e27d5e 5246update_lft:
f53adae4 5247 write_lock_bh(&idev->lock);
fc403832 5248
77ecaace 5249 if (update_rs) {
fc403832 5250 idev->if_flags |= IF_RS_SENT;
bd11f074
MŻ		 5251 idev->rs_interval = rfc3315_s14_backoff_init(
5252 idev->cnf.rtr_solicit_interval);
77ecaace 5253 idev->rs_probes = 1;
bd11f074 5254 addrconf_mod_rs_timer(idev, idev->rs_interval);
77ecaace 5255 }
f53adae4
DB		 5256
5257 /* Well, that's kinda nasty ... */
5258 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5259 spin_lock(&ifp->lock);
617fe29d 5260 if (ifp->tokenized) {
f53adae4
DB		 5261 ifp->valid_lft = 0;
5262 ifp->prefered_lft = 0;
5263 }
5264 spin_unlock(&ifp->lock);
5265 }
5266
5267 write_unlock_bh(&idev->lock);
b2ed64a9 5268 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 5269 addrconf_verify_rtnl();
f53adae4
DB		 5270 return 0;
5271}
5272
11b1f828
DB		 5273static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5274 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5275 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5276};
5277
5278static int inet6_validate_link_af(const struct net_device *dev,
5279 const struct nlattr *nla)
5280{
5281 struct nlattr *tb[IFLA_INET6_MAX + 1];
5282
5283 if (dev && !__in6_dev_get(dev))
5284 return -EAFNOSUPPORT;
5285
fceb6435
JB		 5286 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5287 NULL);
11b1f828
DB		 5288}
5289
d35a00b8
FJ		 5290static int check_addr_gen_mode(int mode)
5291{
5292 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5293 mode != IN6_ADDR_GEN_MODE_NONE &&
5294 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5295 mode != IN6_ADDR_GEN_MODE_RANDOM)
5296 return -EINVAL;
5297 return 1;
5298}
5299
5300static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5301 int mode)
5302{
5303 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5304 !idev->cnf.stable_secret.initialized &&
5305 !net->ipv6.devconf_dflt->stable_secret.initialized)
5306 return -EINVAL;
5307 return 1;
5308}
5309
f53adae4
DB		 5310static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5311{
5312 int err = -EINVAL;
5313 struct inet6_dev *idev = __in6_dev_get(dev);
5314 struct nlattr *tb[IFLA_INET6_MAX + 1];
5315
5316 if (!idev)
5317 return -EAFNOSUPPORT;
5318
fceb6435 5319 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
f53adae4
DB		 5320 BUG();
5321
bc91b0f0 5322 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 5323 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 5324 if (err)
5325 return err;
5326 }
5327
5328 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5329 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5330
d35a00b8
FJ		 5331 if (check_addr_gen_mode(mode) < 0 ||
5332 check_stable_privacy(idev, dev_net(dev), mode) < 0)
bc91b0f0 5333 return -EINVAL;
622c81d5 5334
d35a00b8 5335 idev->cnf.addr_gen_mode = mode;
bc91b0f0
JP		 5336 err = 0;
5337 }
f53adae4
DB		 5338
5339 return err;
5340}
5341
1ab1457c 5342static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5343 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5344{
04561c1f 5345 struct net_device *dev = idev->dev;
04561c1f
TG		 5346 struct ifinfomsg *hdr;
5347 struct nlmsghdr *nlh;
5348 void *protoinfo;
04561c1f 5349
15e47304 5350 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5351 if (!nlh)
26932566 5352 return -EMSGSIZE;
04561c1f
TG		 5353
5354 hdr = nlmsg_data(nlh);
5355 hdr->ifi_family = AF_INET6;
5356 hdr->__ifi_pad = 0;
5357 hdr->ifi_type = dev->type;
5358 hdr->ifi_index = dev->ifindex;
5359 hdr->ifi_flags = dev_get_flags(dev);
5360 hdr->ifi_change = 0;
5361
c78679e8
DM		 5362 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5363 (dev->addr_len &&
5364 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5365 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5366 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5367 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5368 nla_put_u8(skb, IFLA_OPERSTATE,
5369 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5370 goto nla_put_failure;
04561c1f 5371 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 5372 if (!protoinfo)
04561c1f 5373 goto nla_put_failure;
1da177e4 5374
d5566fd7 5375 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5376 goto nla_put_failure;
1da177e4 5377
04561c1f 5378 nla_nest_end(skb, protoinfo);
053c095a
JB		 5379 nlmsg_end(skb, nlh);
5380 return 0;
1da177e4 5381
04561c1f 5382nla_put_failure:
26932566
PM		 5383 nlmsg_cancel(skb, nlh);
5384 return -EMSGSIZE;
1da177e4
LT		 5385}
5386
5387static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5388{
3b1e0a65 5389 struct net *net = sock_net(skb->sk);
84d2697d 5390 int h, s_h;
434a8a58 5391 int idx = 0, s_idx;
1da177e4
LT		 5392 struct net_device *dev;
5393 struct inet6_dev *idev;
84d2697d 5394 struct hlist_head *head;
1da177e4 5395
84d2697d
ED		 5396 s_h = cb->args[0];
5397 s_idx = cb->args[1];
5398
5399 rcu_read_lock();
5400 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5401 idx = 0;
5402 head = &net->dev_index_head[h];
b67bfe0d 5403 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5404 if (idx < s_idx)
5405 goto cont;
5406 idev = __in6_dev_get(dev);
5407 if (!idev)
5408 goto cont;
5409 if (inet6_fill_ifinfo(skb, idev,
15e47304 5410 NETLINK_CB(cb->skb).portid,
84d2697d 5411 cb->nlh->nlmsg_seq,
053c095a 5412 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5413 goto out;
7562f876 5414cont:
84d2697d
ED		 5415 idx++;
5416 }
1da177e4 5417 }
84d2697d
ED		 5418out:
5419 rcu_read_unlock();
5420 cb->args[1] = idx;
5421 cb->args[0] = h;
1da177e4
LT		 5422
5423 return skb->len;
5424}
5425
5426void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5427{
5428 struct sk_buff *skb;
c346dca1 5429 struct net *net = dev_net(idev->dev);
8d7a76c9 5430 int err = -ENOBUFS;
1ab1457c 5431
339bf98f 5432 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5433 if (!skb)
8d7a76c9
TG		 5434 goto errout;
5435
5436 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5437 if (err < 0) {
5438 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5439 WARN_ON(err == -EMSGSIZE);
5440 kfree_skb(skb);
5441 goto errout;
5442 }
5f75a104 5443 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5444 return;
8d7a76c9
TG		 5445errout:
5446 if (err < 0)
5f75a104 5447 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5448}
5449
339bf98f
TG		 5450static inline size_t inet6_prefix_nlmsg_size(void)
5451{
5452 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5453 + nla_total_size(sizeof(struct in6_addr))
5454 + nla_total_size(sizeof(struct prefix_cacheinfo));
5455}
c5396a31 5456
1da177e4 5457static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5458 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5459 int event, unsigned int flags)
1da177e4 5460{
6051e2f4
TG		 5461 struct prefixmsg *pmsg;
5462 struct nlmsghdr *nlh;
1da177e4
LT		 5463 struct prefix_cacheinfo ci;
5464
15e47304 5465 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5466 if (!nlh)
26932566 5467 return -EMSGSIZE;
6051e2f4
TG		 5468
5469 pmsg = nlmsg_data(nlh);
1da177e4 5470 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5471 pmsg->prefix_pad1 = 0;
5472 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5473 pmsg->prefix_ifindex = idev->dev->ifindex;
5474 pmsg->prefix_len = pinfo->prefix_len;
5475 pmsg->prefix_type = pinfo->type;
8a47077a 5476 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5477 pmsg->prefix_flags = 0;
5478 if (pinfo->onlink)
5479 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5480 if (pinfo->autoconf)
5481 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5482
c78679e8
DM		 5483 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5484 goto nla_put_failure;
1da177e4
LT		 5485 ci.preferred_time = ntohl(pinfo->prefered);
5486 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5487 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5488 goto nla_put_failure;
053c095a
JB		 5489 nlmsg_end(skb, nlh);
5490 return 0;
1da177e4 5491
6051e2f4 5492nla_put_failure:
26932566
PM		 5493 nlmsg_cancel(skb, nlh);
5494 return -EMSGSIZE;
1da177e4
LT		 5495}
5496
1ab1457c 5497static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5498 struct prefix_info *pinfo)
5499{
5500 struct sk_buff *skb;
c346dca1 5501 struct net *net = dev_net(idev->dev);
8c384bfa 5502 int err = -ENOBUFS;
1da177e4 5503
339bf98f 5504 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5505 if (!skb)
8c384bfa
TG		 5506 goto errout;
5507
5508 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5509 if (err < 0) {
5510 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5511 WARN_ON(err == -EMSGSIZE);
5512 kfree_skb(skb);
5513 goto errout;
5514 }
1ce85fe4
PNA		 5515 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5516 return;
8c384bfa
TG		 5517errout:
5518 if (err < 0)
6fda7350 5519 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5520}
5521
1da177e4
LT		 5522static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5523{
63998ac2
ND		 5524 struct net *net = dev_net(ifp->idev->dev);
5525
c15b1cca
HFS		 5526 if (event)
5527 ASSERT_RTNL();
5528
1da177e4
LT		 5529 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5530
5531 switch (event) {
5532 case RTM_NEWADDR:
95c385b4
NH		 5533 /*
5534 * If the address was optimistic
5535 * we inserted the route at the start of
5536 * our DAD process, so we don't need
5537 * to do it again
5538 */
5539 if (!(ifp->rt->rt6i_node))
5540 ip6_ins_rt(ifp->rt);
1da177e4
LT		 5541 if (ifp->idev->cnf.forwarding)
5542 addrconf_join_anycast(ifp);
7996c799 5543 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 5544 addrconf_prefix_route(&ifp->peer_addr, 128,
5545 ifp->idev->dev, 0, 0);
1da177e4
LT		 5546 break;
5547 case RTM_DELADDR:
5548 if (ifp->idev->cnf.forwarding)
5549 addrconf_leave_anycast(ifp);
5550 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5551 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 5552 struct rt6_info *rt;
caeaba79 5553
e7478dfc
ND		 5554 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5555 ifp->idev->dev, 0, 0);
8e3d5be7
MKL		 5556 if (rt)
5557 ip6_del_rt(rt);
caeaba79 5558 }
38bd10c4
DA		 5559 if (ifp->rt) {
5560 dst_hold(&ifp->rt->dst);
5561 ip6_del_rt(ifp->rt);
5562 }
705f1c86 5563 rt_genid_bump_ipv6(net);
1da177e4
LT		 5564 break;
5565 }
63998ac2 5566 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5567}
5568
5569static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5570{
8814c4b5 5571 rcu_read_lock_bh();
1da177e4
LT		 5572 if (likely(ifp->idev->dead == 0))
5573 __ipv6_ifa_notify(event, ifp);
8814c4b5 5574 rcu_read_unlock_bh();
1da177e4
LT		 5575}
5576
5577#ifdef CONFIG_SYSCTL
5578
5579static
fe2c6338 5580int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5581 void __user *buffer, size_t *lenp, loff_t *ppos)
5582{
5583 int *valp = ctl->data;
5584 int val = *valp;
88af182e 5585 loff_t pos = *ppos;
fe2c6338 5586 struct ctl_table lctl;
1da177e4
LT		 5587 int ret;
5588
013d97e9
FR		 5589 /*
5590 * ctl->data points to idev->cnf.forwarding, we should
5591 * not modify it until we get the rtnl lock.
5592 */
5593 lctl = *ctl;
5594 lctl.data = &val;
5595
5596 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5597
c8fecf22 5598 if (write)
b325fddb 5599 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5600 if (ret)
5601 *ppos = pos;
1ab1457c 5602 return ret;
1da177e4
LT		 5603}
5604
77751427
ML		 5605static
5606int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5607 void __user *buffer, size_t *lenp, loff_t *ppos)
5608{
5609 struct inet6_dev *idev = ctl->extra1;
5610 int min_mtu = IPV6_MIN_MTU;
5611 struct ctl_table lctl;
5612
5613 lctl = *ctl;
5614 lctl.extra1 = &min_mtu;
5615 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5616
5617 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5618}
5619
56d417b1
BH		 5620static void dev_disable_change(struct inet6_dev *idev)
5621{
75538c2b
CW		 5622 struct netdev_notifier_info info;
5623
56d417b1
BH		 5624 if (!idev || !idev->dev)
5625 return;
5626
75538c2b 5627 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5628 if (idev->cnf.disable_ipv6)
75538c2b 5629 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5630 else
75538c2b 5631 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5632}
5633
5634static void addrconf_disable_change(struct net *net, __s32 newf)
5635{
5636 struct net_device *dev;
5637 struct inet6_dev *idev;
5638
03e4deff 5639 for_each_netdev(net, dev) {
56d417b1
BH		 5640 idev = __in6_dev_get(dev);
5641 if (idev) {
5642 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5643 idev->cnf.disable_ipv6 = newf;
5644 if (changed)
5645 dev_disable_change(idev);
5646 }
56d417b1 5647 }
56d417b1
BH		 5648}
5649
013d97e9 5650static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5651{
5652 struct net *net;
013d97e9
FR		 5653 int old;
5654
5655 if (!rtnl_trylock())
5656 return restart_syscall();
56d417b1
BH		 5657
5658 net = (struct net *)table->extra2;
013d97e9
FR		 5659 old = *p;
5660 *p = newf;
56d417b1 5661
013d97e9
FR		 5662 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5663 rtnl_unlock();
56d417b1 5664 return 0;
88af182e 5665 }
56d417b1
BH		 5666
5667 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5668 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5669 addrconf_disable_change(net, newf);
013d97e9 5670 } else if ((!newf) ^ (!old))
56d417b1
BH		 5671 dev_disable_change((struct inet6_dev *)table->extra1);
5672
5673 rtnl_unlock();
5674 return 0;
5675}
5676
5677static
fe2c6338 5678int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5679 void __user *buffer, size_t *lenp, loff_t *ppos)
5680{
5681 int *valp = ctl->data;
5682 int val = *valp;
88af182e 5683 loff_t pos = *ppos;
fe2c6338 5684 struct ctl_table lctl;
56d417b1
BH		 5685 int ret;
5686
013d97e9
FR		 5687 /*
5688 * ctl->data points to idev->cnf.disable_ipv6, we should
5689 * not modify it until we get the rtnl lock.
5690 */
5691 lctl = *ctl;
5692 lctl.data = &val;
5693
5694 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5695
5696 if (write)
5697 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5698 if (ret)
5699 *ppos = pos;
56d417b1
BH		 5700 return ret;
5701}
5702
c92d5491 5703static
5704int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5705 void __user *buffer, size_t *lenp, loff_t *ppos)
5706{
5707 int *valp = ctl->data;
5708 int ret;
5709 int old, new;
5710
5711 old = *valp;
5712 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5713 new = *valp;
5714
5715 if (write && old != new) {
5716 struct net *net = ctl->extra2;
5717
5718 if (!rtnl_trylock())
5719 return restart_syscall();
5720
5721 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
85b3daad
DA		 5722 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5723 NETCONFA_PROXY_NEIGH,
c92d5491 5724 NETCONFA_IFINDEX_DEFAULT,
5725 net->ipv6.devconf_dflt);
5726 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
85b3daad
DA		 5727 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5728 NETCONFA_PROXY_NEIGH,
c92d5491 5729 NETCONFA_IFINDEX_ALL,
5730 net->ipv6.devconf_all);
5731 else {
5732 struct inet6_dev *idev = ctl->extra1;
5733
85b3daad
DA		 5734 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5735 NETCONFA_PROXY_NEIGH,
c92d5491 5736 idev->dev->ifindex,
5737 &idev->cnf);
5738 }
5739 rtnl_unlock();
5740 }
5741
5742 return ret;
5743}
5744
d35a00b8
FJ		 5745static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5746 void __user *buffer, size_t *lenp,
5747 loff_t *ppos)
5748{
5749 int ret = 0;
5750 int new_val;
5751 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5752 struct net *net = (struct net *)ctl->extra2;
5753
8c171d6c
FJ		 5754 if (!rtnl_trylock())
5755 return restart_syscall();
5756
d35a00b8
FJ		 5757 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5758
5759 if (write) {
5760 new_val = *((int *)ctl->data);
5761
8c171d6c
FJ		 5762 if (check_addr_gen_mode(new_val) < 0) {
5763 ret = -EINVAL;
5764 goto out;
5765 }
d35a00b8
FJ		 5766
5767 /* request for default */
5768 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5769 ipv6_devconf_dflt.addr_gen_mode = new_val;
5770
5771 /* request for individual net device */
5772 } else {
5773 if (!idev)
8c171d6c 5774 goto out;
d35a00b8 5775
8c171d6c
FJ		 5776 if (check_stable_privacy(idev, net, new_val) < 0) {
5777 ret = -EINVAL;
5778 goto out;
5779 }
d35a00b8
FJ		 5780
5781 if (idev->cnf.addr_gen_mode != new_val) {
5782 idev->cnf.addr_gen_mode = new_val;
d35a00b8 5783 addrconf_dev_config(idev->dev);
d35a00b8
FJ		 5784 }
5785 }
5786 }
5787
8c171d6c
FJ		 5788out:
5789 rtnl_unlock();
5790
d35a00b8
FJ		 5791 return ret;
5792}
5793
3d1bec99
HFS		 5794static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5795 void __user *buffer, size_t *lenp,
5796 loff_t *ppos)
5797{
5798 int err;
5799 struct in6_addr addr;
5800 char str[IPV6_MAX_STRLEN];
5801 struct ctl_table lctl = *ctl;
622c81d5 5802 struct net *net = ctl->extra2;
3d1bec99
HFS		 5803 struct ipv6_stable_secret *secret = ctl->data;
5804
622c81d5
HFS		 5805 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5806 return -EIO;
5807
3d1bec99
HFS		 5808 lctl.maxlen = IPV6_MAX_STRLEN;
5809 lctl.data = str;
5810
5811 if (!rtnl_trylock())
5812 return restart_syscall();
5813
5814 if (!write && !secret->initialized) {
5815 err = -EIO;
5816 goto out;
5817 }
5818
5449a5ca
WC		 5819 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5820 if (err >= sizeof(str)) {
5821 err = -EIO;
5822 goto out;
3d1bec99
HFS		 5823 }
5824
5825 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5826 if (err || !write)
5827 goto out;
5828
5829 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5830 err = -EIO;
5831 goto out;
5832 }
5833
5834 secret->initialized = true;
5835 secret->secret = addr;
5836
622c81d5
HFS		 5837 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5838 struct net_device *dev;
5839
5840 for_each_netdev(net, dev) {
5841 struct inet6_dev *idev = __in6_dev_get(dev);
5842
5843 if (idev) {
d35a00b8 5844 idev->cnf.addr_gen_mode =
622c81d5
HFS		 5845 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5846 }
5847 }
5848 } else {
5849 struct inet6_dev *idev = ctl->extra1;
5850
d35a00b8 5851 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
622c81d5
HFS		 5852 }
5853
3d1bec99
HFS		 5854out:
5855 rtnl_unlock();
5856
5857 return err;
5858}
c92d5491 5859
35103d11
AG		 5860static
5861int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5862 int write,
5863 void __user *buffer,
5864 size_t *lenp,
5865 loff_t *ppos)
5866{
5867 int *valp = ctl->data;
5868 int val = *valp;
5869 loff_t pos = *ppos;
5870 struct ctl_table lctl;
5871 int ret;
5872
5873 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5874 * we should not modify it until we get the rtnl lock.
5875 */
5876 lctl = *ctl;
5877 lctl.data = &val;
5878
5879 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5880
5881 if (write)
5882 ret = addrconf_fixup_linkdown(ctl, valp, val);
5883 if (ret)
5884 *ppos = pos;
5885 return ret;
5886}
5887
df789fe7
DF		 5888static
5889void addrconf_set_nopolicy(struct rt6_info *rt, int action)
5890{
5891 if (rt) {
5892 if (action)
5893 rt->dst.flags |= DST_NOPOLICY;
5894 else
5895 rt->dst.flags &= ~DST_NOPOLICY;
5896 }
5897}
5898
5899static
5900void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
5901{
5902 struct inet6_ifaddr *ifa;
5903
5904 read_lock_bh(&idev->lock);
5905 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5906 spin_lock(&ifa->lock);
5907 if (ifa->rt) {
5908 struct rt6_info *rt = ifa->rt;
5909 struct fib6_table *table = rt->rt6i_table;
5910 int cpu;
5911
5912 read_lock(&table->tb6_lock);
5913 addrconf_set_nopolicy(ifa->rt, val);
5914 if (rt->rt6i_pcpu) {
5915 for_each_possible_cpu(cpu) {
5916 struct rt6_info **rtp;
5917
5918 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
5919 addrconf_set_nopolicy(*rtp, val);
5920 }
5921 }
5922 read_unlock(&table->tb6_lock);
5923 }
5924 spin_unlock(&ifa->lock);
5925 }
5926 read_unlock_bh(&idev->lock);
5927}
5928
5929static
5930int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
5931{
5932 struct inet6_dev *idev;
5933 struct net *net;
5934
5935 if (!rtnl_trylock())
5936 return restart_syscall();
5937
5938 *valp = val;
5939
5940 net = (struct net *)ctl->extra2;
5941 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
5942 rtnl_unlock();
5943 return 0;
5944 }
5945
5946 if (valp == &net->ipv6.devconf_all->disable_policy) {
5947 struct net_device *dev;
5948
5949 for_each_netdev(net, dev) {
5950 idev = __in6_dev_get(dev);
5951 if (idev)
5952 addrconf_disable_policy_idev(idev, val);
5953 }
5954 } else {
5955 idev = (struct inet6_dev *)ctl->extra1;
5956 addrconf_disable_policy_idev(idev, val);
5957 }
5958
5959 rtnl_unlock();
5960 return 0;
5961}
5962
5963static
5964int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
5965 void __user *buffer, size_t *lenp,
5966 loff_t *ppos)
5967{
5968 int *valp = ctl->data;
5969 int val = *valp;
5970 loff_t pos = *ppos;
5971 struct ctl_table lctl;
5972 int ret;
5973
5974 lctl = *ctl;
5975 lctl.data = &val;
5976 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5977
5978 if (write && (*valp != val))
5979 ret = addrconf_disable_policy(ctl, valp, val);
5980
5981 if (ret)
5982 *ppos = pos;
5983
5984 return ret;
5985}
5986
cb4a4c69 5987static int minus_one = -1;
cb9e684e
MŻ		 5988static const int one = 1;
5989static const int two_five_five = 255;
5990
607ea7cd 5991static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 5992 {
5993 .procname = "forwarding",
5994 .data = &ipv6_devconf.forwarding,
5995 .maxlen = sizeof(int),
5996 .mode = 0644,
5997 .proc_handler = addrconf_sysctl_forward,
5998 },
5999 {
6000 .procname = "hop_limit",
6001 .data = &ipv6_devconf.hop_limit,
6002 .maxlen = sizeof(int),
6003 .mode = 0644,
cb9e684e
MŻ		 6004 .proc_handler = proc_dointvec_minmax,
6005 .extra1 = (void *)&one,
6006 .extra2 = (void *)&two_five_five,
5df1f77f
KK		 6007 },
6008 {
6009 .procname = "mtu",
6010 .data = &ipv6_devconf.mtu6,
6011 .maxlen = sizeof(int),
6012 .mode = 0644,
6013 .proc_handler = addrconf_sysctl_mtu,
6014 },
6015 {
6016 .procname = "accept_ra",
6017 .data = &ipv6_devconf.accept_ra,
6018 .maxlen = sizeof(int),
6019 .mode = 0644,
6020 .proc_handler = proc_dointvec,
6021 },
6022 {
6023 .procname = "accept_redirects",
6024 .data = &ipv6_devconf.accept_redirects,
6025 .maxlen = sizeof(int),
6026 .mode = 0644,
6027 .proc_handler = proc_dointvec,
6028 },
6029 {
6030 .procname = "autoconf",
6031 .data = &ipv6_devconf.autoconf,
6032 .maxlen = sizeof(int),
6033 .mode = 0644,
6034 .proc_handler = proc_dointvec,
6035 },
6036 {
6037 .procname = "dad_transmits",
6038 .data = &ipv6_devconf.dad_transmits,
6039 .maxlen = sizeof(int),
6040 .mode = 0644,
6041 .proc_handler = proc_dointvec,
6042 },
6043 {
6044 .procname = "router_solicitations",
6045 .data = &ipv6_devconf.rtr_solicits,
6046 .maxlen = sizeof(int),
6047 .mode = 0644,
cb4a4c69
MŻ		 6048 .proc_handler = proc_dointvec_minmax,
6049 .extra1 = &minus_one,
5df1f77f
KK		 6050 },
6051 {
6052 .procname = "router_solicitation_interval",
6053 .data = &ipv6_devconf.rtr_solicit_interval,
6054 .maxlen = sizeof(int),
6055 .mode = 0644,
6056 .proc_handler = proc_dointvec_jiffies,
6057 },
bd11f074
MŻ		 6058 {
6059 .procname = "router_solicitation_max_interval",
6060 .data = &ipv6_devconf.rtr_solicit_max_interval,
6061 .maxlen = sizeof(int),
6062 .mode = 0644,
6063 .proc_handler = proc_dointvec_jiffies,
6064 },
5df1f77f
KK		 6065 {
6066 .procname = "router_solicitation_delay",
6067 .data = &ipv6_devconf.rtr_solicit_delay,
6068 .maxlen = sizeof(int),
6069 .mode = 0644,
6070 .proc_handler = proc_dointvec_jiffies,
6071 },
6072 {
6073 .procname = "force_mld_version",
6074 .data = &ipv6_devconf.force_mld_version,
6075 .maxlen = sizeof(int),
6076 .mode = 0644,
6077 .proc_handler = proc_dointvec,
6078 },
6079 {
6080 .procname = "mldv1_unsolicited_report_interval",
6081 .data =
6082 &ipv6_devconf.mldv1_unsolicited_report_interval,
6083 .maxlen = sizeof(int),
6084 .mode = 0644,
6085 .proc_handler = proc_dointvec_ms_jiffies,
6086 },
6087 {
6088 .procname = "mldv2_unsolicited_report_interval",
6089 .data =
6090 &ipv6_devconf.mldv2_unsolicited_report_interval,
6091 .maxlen = sizeof(int),
6092 .mode = 0644,
6093 .proc_handler = proc_dointvec_ms_jiffies,
6094 },
6095 {
6096 .procname = "use_tempaddr",
6097 .data = &ipv6_devconf.use_tempaddr,
6098 .maxlen = sizeof(int),
6099 .mode = 0644,
6100 .proc_handler = proc_dointvec,
6101 },
6102 {
6103 .procname = "temp_valid_lft",
6104 .data = &ipv6_devconf.temp_valid_lft,
6105 .maxlen = sizeof(int),
6106 .mode = 0644,
6107 .proc_handler = proc_dointvec,
6108 },
6109 {
6110 .procname = "temp_prefered_lft",
6111 .data = &ipv6_devconf.temp_prefered_lft,
6112 .maxlen = sizeof(int),
6113 .mode = 0644,
6114 .proc_handler = proc_dointvec,
6115 },
6116 {
6117 .procname = "regen_max_retry",
6118 .data = &ipv6_devconf.regen_max_retry,
6119 .maxlen = sizeof(int),
6120 .mode = 0644,
6121 .proc_handler = proc_dointvec,
6122 },
6123 {
6124 .procname = "max_desync_factor",
6125 .data = &ipv6_devconf.max_desync_factor,
6126 .maxlen = sizeof(int),
6127 .mode = 0644,
6128 .proc_handler = proc_dointvec,
6129 },
6130 {
6131 .procname = "max_addresses",
6132 .data = &ipv6_devconf.max_addresses,
6133 .maxlen = sizeof(int),
6134 .mode = 0644,
6135 .proc_handler = proc_dointvec,
6136 },
6137 {
6138 .procname = "accept_ra_defrtr",
6139 .data = &ipv6_devconf.accept_ra_defrtr,
6140 .maxlen = sizeof(int),
6141 .mode = 0644,
6142 .proc_handler = proc_dointvec,
6143 },
6144 {
6145 .procname = "accept_ra_min_hop_limit",
6146 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6147 .maxlen = sizeof(int),
6148 .mode = 0644,
6149 .proc_handler = proc_dointvec,
6150 },
6151 {
6152 .procname = "accept_ra_pinfo",
6153 .data = &ipv6_devconf.accept_ra_pinfo,
6154 .maxlen = sizeof(int),
6155 .mode = 0644,
6156 .proc_handler = proc_dointvec,
6157 },
930d6ff2 6158#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 6159 {
6160 .procname = "accept_ra_rtr_pref",
6161 .data = &ipv6_devconf.accept_ra_rtr_pref,
6162 .maxlen = sizeof(int),
6163 .mode = 0644,
6164 .proc_handler = proc_dointvec,
6165 },
6166 {
6167 .procname = "router_probe_interval",
6168 .data = &ipv6_devconf.rtr_probe_interval,
6169 .maxlen = sizeof(int),
6170 .mode = 0644,
6171 .proc_handler = proc_dointvec_jiffies,
6172 },
fa03ef38 6173#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b
JS		 6174 {
6175 .procname = "accept_ra_rt_info_min_plen",
6176 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6177 .maxlen = sizeof(int),
6178 .mode = 0644,
6179 .proc_handler = proc_dointvec,
6180 },
5df1f77f
KK		 6181 {
6182 .procname = "accept_ra_rt_info_max_plen",
6183 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6184 .maxlen = sizeof(int),
6185 .mode = 0644,
6186 .proc_handler = proc_dointvec,
6187 },
09c884d4 6188#endif
930d6ff2 6189#endif
5df1f77f
KK		 6190 {
6191 .procname = "proxy_ndp",
6192 .data = &ipv6_devconf.proxy_ndp,
6193 .maxlen = sizeof(int),
6194 .mode = 0644,
6195 .proc_handler = addrconf_sysctl_proxy_ndp,
6196 },
6197 {
6198 .procname = "accept_source_route",
6199 .data = &ipv6_devconf.accept_source_route,
6200 .maxlen = sizeof(int),
6201 .mode = 0644,
6202 .proc_handler = proc_dointvec,
6203 },
95c385b4 6204#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 6205 {
6206 .procname = "optimistic_dad",
6207 .data = &ipv6_devconf.optimistic_dad,
6208 .maxlen = sizeof(int),
6209 .mode = 0644,
6210 .proc_handler = proc_dointvec,
6211 },
6212 {
6213 .procname = "use_optimistic",
6214 .data = &ipv6_devconf.use_optimistic,
6215 .maxlen = sizeof(int),
6216 .mode = 0644,
6217 .proc_handler = proc_dointvec,
6218 },
7bc570c8
YH		 6219#endif
6220#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 6221 {
6222 .procname = "mc_forwarding",
6223 .data = &ipv6_devconf.mc_forwarding,
6224 .maxlen = sizeof(int),
6225 .mode = 0444,
6226 .proc_handler = proc_dointvec,
6227 },
95c385b4 6228#endif
5df1f77f
KK		 6229 {
6230 .procname = "disable_ipv6",
6231 .data = &ipv6_devconf.disable_ipv6,
6232 .maxlen = sizeof(int),
6233 .mode = 0644,
6234 .proc_handler = addrconf_sysctl_disable,
6235 },
6236 {
6237 .procname = "accept_dad",
6238 .data = &ipv6_devconf.accept_dad,
6239 .maxlen = sizeof(int),
6240 .mode = 0644,
6241 .proc_handler = proc_dointvec,
6242 },
6243 {
6244 .procname = "force_tllao",
6245 .data = &ipv6_devconf.force_tllao,
6246 .maxlen = sizeof(int),
6247 .mode = 0644,
6248 .proc_handler = proc_dointvec
6249 },
6250 {
6251 .procname = "ndisc_notify",
6252 .data = &ipv6_devconf.ndisc_notify,
6253 .maxlen = sizeof(int),
6254 .mode = 0644,
6255 .proc_handler = proc_dointvec
6256 },
6257 {
6258 .procname = "suppress_frag_ndisc",
6259 .data = &ipv6_devconf.suppress_frag_ndisc,
6260 .maxlen = sizeof(int),
6261 .mode = 0644,
6262 .proc_handler = proc_dointvec
6263 },
6264 {
6265 .procname = "accept_ra_from_local",
6266 .data = &ipv6_devconf.accept_ra_from_local,
6267 .maxlen = sizeof(int),
6268 .mode = 0644,
6269 .proc_handler = proc_dointvec,
6270 },
6271 {
6272 .procname = "accept_ra_mtu",
6273 .data = &ipv6_devconf.accept_ra_mtu,
6274 .maxlen = sizeof(int),
6275 .mode = 0644,
6276 .proc_handler = proc_dointvec,
6277 },
6278 {
6279 .procname = "stable_secret",
6280 .data = &ipv6_devconf.stable_secret,
6281 .maxlen = IPV6_MAX_STRLEN,
6282 .mode = 0600,
6283 .proc_handler = addrconf_sysctl_stable_secret,
6284 },
6285 {
6286 .procname = "use_oif_addrs_only",
6287 .data = &ipv6_devconf.use_oif_addrs_only,
6288 .maxlen = sizeof(int),
6289 .mode = 0644,
6290 .proc_handler = proc_dointvec,
6291 },
6292 {
6293 .procname = "ignore_routes_with_linkdown",
6294 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6295 .maxlen = sizeof(int),
6296 .mode = 0644,
6297 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6298 },
6299 {
6300 .procname = "drop_unicast_in_l2_multicast",
6301 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6302 .maxlen = sizeof(int),
6303 .mode = 0644,
6304 .proc_handler = proc_dointvec,
6305 },
6306 {
6307 .procname = "drop_unsolicited_na",
6308 .data = &ipv6_devconf.drop_unsolicited_na,
6309 .maxlen = sizeof(int),
6310 .mode = 0644,
6311 .proc_handler = proc_dointvec,
6312 },
6313 {
6314 .procname = "keep_addr_on_down",
6315 .data = &ipv6_devconf.keep_addr_on_down,
6316 .maxlen = sizeof(int),
6317 .mode = 0644,
6318 .proc_handler = proc_dointvec,
6319
6320 },
1ababeba
DL		 6321 {
6322 .procname = "seg6_enabled",
6323 .data = &ipv6_devconf.seg6_enabled,
6324 .maxlen = sizeof(int),
6325 .mode = 0644,
6326 .proc_handler = proc_dointvec,
6327 },
bf355b8d
DL		 6328#ifdef CONFIG_IPV6_SEG6_HMAC
6329 {
6330 .procname = "seg6_require_hmac",
6331 .data = &ipv6_devconf.seg6_require_hmac,
6332 .maxlen = sizeof(int),
6333 .mode = 0644,
6334 .proc_handler = proc_dointvec,
6335 },
6336#endif
adc176c5
EN		 6337 {
6338 .procname = "enhanced_dad",
6339 .data = &ipv6_devconf.enhanced_dad,
6340 .maxlen = sizeof(int),
6341 .mode = 0644,
6342 .proc_handler = proc_dointvec,
6343 },
d35a00b8
FJ		 6344 {
6345 .procname = "addr_gen_mode",
6346 .data = &ipv6_devconf.addr_gen_mode,
6347 .maxlen = sizeof(int),
6348 .mode = 0644,
6349 .proc_handler = addrconf_sysctl_addr_gen_mode,
6350 },
df789fe7
DF		 6351 {
6352 .procname = "disable_policy",
6353 .data = &ipv6_devconf.disable_policy,
6354 .maxlen = sizeof(int),
6355 .mode = 0644,
6356 .proc_handler = addrconf_sysctl_disable_policy,
6357 },
5df1f77f
KK		 6358 {
6359 /* sentinel */
6360 }
1da177e4
LT		 6361};
6362
bff16c2f 6363static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 6364 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4 6365{
29c994e3 6366 int i, ifindex;
607ea7cd 6367 struct ctl_table *table;
6105e293 6368 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 6369
607ea7cd
KK		 6370 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6371 if (!table)
f68635e6
PE		 6372 goto out;
6373
607ea7cd
KK		 6374 for (i = 0; table[i].data; i++) {
6375 table[i].data += (char *)p - (char *)&ipv6_devconf;
cb9e684e
MŻ		 6376 /* If one of these is already set, then it is not safe to
6377 * overwrite either of them: this makes proc_dointvec_minmax
6378 * usable.
6379 */
6380 if (!table[i].extra1 && !table[i].extra2) {
6381 table[i].extra1 = idev; /* embedded; no ref */
6382 table[i].extra2 = net;
6383 }
1da177e4 6384 }
1da177e4 6385
6105e293 6386 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 6387
607ea7cd
KK		 6388 p->sysctl_header = register_net_sysctl(net, path, table);
6389 if (!p->sysctl_header)
6105e293 6390 goto free;
f68635e6 6391
29c994e3
ND		 6392 if (!strcmp(dev_name, "all"))
6393 ifindex = NETCONFA_IFINDEX_ALL;
6394 else if (!strcmp(dev_name, "default"))
6395 ifindex = NETCONFA_IFINDEX_DEFAULT;
6396 else
6397 ifindex = idev->dev->ifindex;
85b3daad
DA		 6398 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6399 ifindex, p);
95897312 6400 return 0;
1da177e4 6401
f68635e6 6402free:
607ea7cd 6403 kfree(table);
f68635e6 6404out:
95897312 6405 return -ENOBUFS;
1da177e4
LT		 6406}
6407
23452170
DA		 6408static void __addrconf_sysctl_unregister(struct net *net,
6409 struct ipv6_devconf *p, int ifindex)
408c4768 6410{
607ea7cd 6411 struct ctl_table *table;
408c4768 6412
607ea7cd 6413 if (!p->sysctl_header)
408c4768
PE		 6414 return;
6415
607ea7cd
KK		 6416 table = p->sysctl_header->ctl_table_arg;
6417 unregister_net_sysctl_table(p->sysctl_header);
6418 p->sysctl_header = NULL;
6419 kfree(table);
23452170
DA		 6420
6421 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
408c4768
PE		 6422}
6423
a317a2f1 6424static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 6425{
a317a2f1
WC		 6426 int err;
6427
6428 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6429 return -EINVAL;
6430
6431 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6432 &ndisc_ifinfo_sysctl_change);
6433 if (err)
6434 return err;
6435 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6436 idev, &idev->cnf);
6437 if (err)
6438 neigh_sysctl_unregister(idev->nd_parms);
6439
6440 return err;
f52295a9
PE		 6441}
6442
408c4768 6443static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 6444{
23452170
DA		 6445 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6446 idev->dev->ifindex);
408c4768 6447 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 6448}
6449
6450
6451#endif
6452
2c8c1e72 6453static int __net_init addrconf_init_net(struct net *net)
e0da5a48 6454{
a79ca223 6455 int err = -ENOMEM;
e0da5a48
PE		 6456 struct ipv6_devconf *all, *dflt;
6457
a79ca223 6458 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 6459 if (!all)
a79ca223 6460 goto err_alloc_all;
e0da5a48 6461
a79ca223 6462 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 6463 if (!dflt)
a79ca223 6464 goto err_alloc_dflt;
e0da5a48 6465
a79ca223
HZ		 6466 /* these will be inherited by all namespaces */
6467 dflt->autoconf = ipv6_defaults.autoconf;
6468 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 6469
3d1bec99
HFS		 6470 dflt->stable_secret.initialized = false;
6471 all->stable_secret.initialized = false;
6472
e0da5a48
PE		 6473 net->ipv6.devconf_all = all;
6474 net->ipv6.devconf_dflt = dflt;
6475
6476#ifdef CONFIG_SYSCTL
f8572d8f 6477 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 6478 if (err < 0)
6479 goto err_reg_all;
6480
f8572d8f 6481 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 6482 if (err < 0)
6483 goto err_reg_dflt;
6484#endif
6485 return 0;
6486
6487#ifdef CONFIG_SYSCTL
6488err_reg_dflt:
23452170 6489 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
e0da5a48
PE		 6490err_reg_all:
6491 kfree(dflt);
6492#endif
6493err_alloc_dflt:
6494 kfree(all);
6495err_alloc_all:
6496 return err;
6497}
6498
2c8c1e72 6499static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 6500{
6501#ifdef CONFIG_SYSCTL
23452170
DA		 6502 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6503 NETCONFA_IFINDEX_DEFAULT);
6504 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6505 NETCONFA_IFINDEX_ALL);
e0da5a48 6506#endif
73cf0e92 6507 kfree(net->ipv6.devconf_dflt);
6508 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 6509}
6510
6511static struct pernet_operations addrconf_ops = {
6512 .init = addrconf_init_net,
6513 .exit = addrconf_exit_net,
6514};
6515
207895fd 6516static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 6517 .family = AF_INET6,
6518 .fill_link_af = inet6_fill_link_af,
6519 .get_link_af_size = inet6_get_link_af_size,
11b1f828 6520 .validate_link_af = inet6_validate_link_af,
f53adae4 6521 .set_link_af = inet6_set_link_af,
b382b191
TG		 6522};
6523
1da177e4
LT		 6524/*
6525 * Init / cleanup code
6526 */
6527
6528int __init addrconf_init(void)
6529{
a317a2f1 6530 struct inet6_dev *idev;
c2e21293 6531 int i, err;
2a8cc6c8 6532
e21e8467
SH		 6533 err = ipv6_addr_label_init();
6534 if (err < 0) {
f3213831
JP		 6535 pr_crit("%s: cannot initialize default policy table: %d\n",
6536 __func__, err);
2cc6d2bf 6537 goto out;
2a8cc6c8 6538 }
1da177e4 6539
2cc6d2bf
NH		 6540 err = register_pernet_subsys(&addrconf_ops);
6541 if (err < 0)
6542 goto out_addrlabel;
e0da5a48 6543
c15b1cca
HFS		 6544 addrconf_wq = create_workqueue("ipv6_addrconf");
6545 if (!addrconf_wq) {
6546 err = -ENOMEM;
6547 goto out_nowq;
6548 }
6549
1da177e4
LT		 6550 /* The addrconf netdev notifier requires that loopback_dev
6551 * has it's ipv6 private information allocated and setup
6552 * before it can bring up and give link-local addresses
6553 * to other devices which are up.
6554 *
6555 * Unfortunately, loopback_dev is not necessarily the first
6556 * entry in the global dev_base list of net devices. In fact,
6557 * it is likely to be the very last entry on that list.
6558 * So this causes the notifier registry below to try and
6559 * give link-local addresses to all devices besides loopback_dev
6560 * first, then loopback_dev, which cases all the non-loopback_dev
6561 * devices to fail to get a link-local address.
6562 *
6563 * So, as a temporary fix, allocate the ipv6 structure for
6564 * loopback_dev first by hand.
6565 * Longer term, all of the dependencies ipv6 has upon the loopback
6566 * device and it being up should be removed.
6567 */
6568 rtnl_lock();
a317a2f1 6569 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 6570 rtnl_unlock();
a317a2f1
WC		 6571 if (IS_ERR(idev)) {
6572 err = PTR_ERR(idev);
e0da5a48 6573 goto errlo;
a317a2f1 6574 }
1da177e4 6575
2f460933
WC		 6576 ip6_route_init_special_entries();
6577
c2e21293 6578 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6579 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6580
1da177e4
LT		 6581 register_netdevice_notifier(&ipv6_dev_notf);
6582
c15b1cca 6583 addrconf_verify();
c127ea2c 6584
3678a9d8 6585 rtnl_af_register(&inet6_ops);
b382b191 6586
c7ac8679
GR		 6587 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6588 NULL);
c127ea2c
TG		 6589 if (err < 0)
6590 goto errout;
6591
6592 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 6593 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6594 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6595 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6596 inet6_dump_ifaddr, NULL);
6597 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6598 inet6_dump_ifmcaddr, NULL);
6599 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6600 inet6_dump_ifacaddr, NULL);
76f8f6cb 6601 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
7a674200 6602 inet6_netconf_dump_devconf, NULL);
c127ea2c 6603
2a8cc6c8
YH		 6604 ipv6_addr_label_rtnl_register();
6605
1da177e4 6606 return 0;
c127ea2c 6607errout:
b382b191 6608 rtnl_af_unregister(&inet6_ops);
c127ea2c 6609 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6610errlo:
c15b1cca
HFS		 6611 destroy_workqueue(addrconf_wq);
6612out_nowq:
e0da5a48 6613 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 6614out_addrlabel:
6615 ipv6_addr_label_cleanup();
6616out:
c127ea2c 6617 return err;
1da177e4
LT		 6618}
6619
09f7709f 6620void addrconf_cleanup(void)
1da177e4 6621{
176c39af 6622 struct net_device *dev;
1da177e4
LT		 6623 int i;
6624
6625 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6626 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 6627 ipv6_addr_label_cleanup();
1da177e4
LT		 6628
6629 rtnl_lock();
6630
b382b191
TG		 6631 __rtnl_af_unregister(&inet6_ops);
6632
176c39af
DL		 6633 /* clean dev list */
6634 for_each_netdev(&init_net, dev) {
6635 if (__in6_dev_get(dev) == NULL)
6636 continue;
6637 addrconf_ifdown(dev, 1);
6638 }
6639 addrconf_ifdown(init_net.loopback_dev, 2);
6640
1da177e4
LT		 6641 /*
6642 * Check hash table.
6643 */
5c578aed 6644 spin_lock_bh(&addrconf_hash_lock);
c2e21293 6645 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6646 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 6647 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 6648 cancel_delayed_work(&addr_chk_work);
1da177e4 6649 rtnl_unlock();
c15b1cca
HFS		 6650
6651 destroy_workqueue(addrconf_wq);
1da177e4 6652}
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