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ipv6: prepare RCU lookups for idev->addr_list
[linux-block.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
174cd4b1 46#include <linux/sched/signal.h>
1da177e4
LT		 47#include <linux/socket.h>
48#include <linux/sockios.h>
1da177e4 49#include <linux/net.h>
3d1bec99 50#include <linux/inet.h>
1da177e4
LT		 51#include <linux/in6.h>
52#include <linux/netdevice.h>
1823730f 53#include <linux/if_addr.h>
1da177e4
LT		 54#include <linux/if_arp.h>
55#include <linux/if_arcnet.h>
56#include <linux/if_infiniband.h>
57#include <linux/route.h>
58#include <linux/inetdevice.h>
59#include <linux/init.h>
5a0e3ad6 60#include <linux/slab.h>
1da177e4
LT		 61#ifdef CONFIG_SYSCTL
62#include <linux/sysctl.h>
63#endif
4fc268d2 64#include <linux/capability.h>
1da177e4
LT		 65#include <linux/delay.h>
66#include <linux/notifier.h>
543537bd 67#include <linux/string.h>
ddbe5032 68#include <linux/hash.h>
1da177e4 69
457c4cbc 70#include <net/net_namespace.h>
1da177e4
LT		 71#include <net/sock.h>
72#include <net/snmp.h>
73
5241c2d7 74#include <net/6lowpan.h>
cb6bf355 75#include <net/firewire.h>
1da177e4
LT		 76#include <net/ipv6.h>
77#include <net/protocol.h>
78#include <net/ndisc.h>
79#include <net/ip6_route.h>
80#include <net/addrconf.h>
81#include <net/tcp.h>
82#include <net/ip.h>
5d620266 83#include <net/netlink.h>
f24e3d65 84#include <net/pkt_sched.h>
ca254490 85#include <net/l3mdev.h>
1da177e4
LT		 86#include <linux/if_tunnel.h>
87#include <linux/rtnetlink.h>
f3a1bfb1 88#include <linux/netconf.h>
1da177e4 89#include <linux/random.h>
e21e8467 90#include <linux/uaccess.h>
7f7d9a6b 91#include <asm/unaligned.h>
1da177e4
LT		 92
93#include <linux/proc_fs.h>
94#include <linux/seq_file.h>
bc3b2d7f 95#include <linux/export.h>
1da177e4
LT		 96
97/* Set to 3 to get tracing... */
98#define ACONF_DEBUG 2
99
100#if ACONF_DEBUG >= 3
ba3542e1 101#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
1da177e4 102#else
ba3542e1 103#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
1da177e4
LT		 104#endif
105
106#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e 107
3d1bec99
HFS		 108#define IPV6_MAX_STRLEN \
109 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
110
18a31e1e
TG		 111static inline u32 cstamp_delta(unsigned long cstamp)
112{
113 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
114}
1da177e4 115
bd11f074
MŻ		 116static inline s32 rfc3315_s14_backoff_init(s32 irt)
117{
118 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
119 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
120 do_div(tmp, 1000000);
121 return (s32)tmp;
122}
123
124static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
125{
126 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
127 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
128 do_div(tmp, 1000000);
129 if ((s32)tmp > mrt) {
130 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
131 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
132 do_div(tmp, 1000000);
133 }
134 return (s32)tmp;
135}
136
1da177e4 137#ifdef CONFIG_SYSCTL
a317a2f1 138static int addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 139static void addrconf_sysctl_unregister(struct inet6_dev *idev);
140#else
a317a2f1 141static inline int addrconf_sysctl_register(struct inet6_dev *idev)
408c4768 142{
a317a2f1 143 return 0;
408c4768
PE		 144}
145
146static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
147{
148}
1da177e4
LT		 149#endif
150
9d6280da
JB		 151static void ipv6_regen_rndid(struct inet6_dev *idev);
152static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 153
1b34be74 154static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4 155static int ipv6_count_addresses(struct inet6_dev *idev);
622c81d5
HFS		 156static int ipv6_generate_stable_address(struct in6_addr *addr,
157 u8 dad_count,
158 const struct inet6_dev *idev);
1da177e4
LT		 159
160/*
161 * Configured unicast address hash table
162 */
c2e21293 163static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 164static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 165
c15b1cca
HFS		 166static void addrconf_verify(void);
167static void addrconf_verify_rtnl(void);
168static void addrconf_verify_work(struct work_struct *);
1da177e4 169
c15b1cca
HFS		 170static struct workqueue_struct *addrconf_wq;
171static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
1da177e4
LT		 172
173static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
174static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
175
93d9b7d7
JP		 176static void addrconf_type_change(struct net_device *dev,
177 unsigned long event);
1da177e4
LT		 178static int addrconf_ifdown(struct net_device *dev, int how);
179
21caa662
RK		 180static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
181 int plen,
182 const struct net_device *dev,
183 u32 flags, u32 noflags);
184
cf22f9a2 185static void addrconf_dad_start(struct inet6_ifaddr *ifp);
c15b1cca 186static void addrconf_dad_work(struct work_struct *w);
764d3be6 187static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id);
c5e33bdd 188static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 189static void addrconf_rs_timer(unsigned long data);
190static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
191static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
192
1ab1457c 193static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 194 struct prefix_info *pinfo);
3e81c6da
DM		 195static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
196 struct net_device *dev);
1da177e4 197
888c848e 198static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 199 .forwarding = 0,
200 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
201 .mtu6 = IPV6_MIN_MTU,
202 .accept_ra = 1,
203 .accept_redirects = 1,
204 .autoconf = 1,
205 .force_mld_version = 0,
fc4eba58
HFS		 206 .mldv1_unsolicited_report_interval = 10 * HZ,
207 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 208 .dad_transmits = 1,
209 .rtr_solicits = MAX_RTR_SOLICITATIONS,
210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 211 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 212 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
67ba4152 213 .use_tempaddr = 0,
1da177e4
LT		 214 .temp_valid_lft = TEMP_VALID_LIFETIME,
215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
216 .regen_max_retry = REGEN_MAX_RETRY,
217 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 218 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 219 .accept_ra_defrtr = 1,
d9333196 220 .accept_ra_from_local = 0,
8013d1d7 221 .accept_ra_min_hop_limit= 1,
c4fd30eb 222 .accept_ra_pinfo = 1,
930d6ff2
YH		 223#ifdef CONFIG_IPV6_ROUTER_PREF
224 .accept_ra_rtr_pref = 1,
52e16356 225 .rtr_probe_interval = 60 * HZ,
09c884d4 226#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 227 .accept_ra_rt_info_min_plen = 0,
09c884d4
YH		 228 .accept_ra_rt_info_max_plen = 0,
229#endif
930d6ff2 230#endif
fbea49e1 231 .proxy_ndp = 0,
0bcbc926 232 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 233 .disable_ipv6 = 0,
1b34be74 234 .accept_dad = 1,
b800c3b9 235 .suppress_frag_ndisc = 1,
c2943f14 236 .accept_ra_mtu = 1,
3d1bec99
HFS		 237 .stable_secret = {
238 .initialized = false,
3985e8a3
EK		 239 },
240 .use_oif_addrs_only = 0,
35103d11 241 .ignore_routes_with_linkdown = 0,
f1705ec1 242 .keep_addr_on_down = 0,
1ababeba 243 .seg6_enabled = 0,
bf355b8d
DL		 244#ifdef CONFIG_IPV6_SEG6_HMAC
245 .seg6_require_hmac = 0,
246#endif
adc176c5 247 .enhanced_dad = 1,
d35a00b8 248 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
df789fe7 249 .disable_policy = 0,
1da177e4
LT		 250};
251
ab32ea5d 252static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 253 .forwarding = 0,
254 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
255 .mtu6 = IPV6_MIN_MTU,
256 .accept_ra = 1,
257 .accept_redirects = 1,
258 .autoconf = 1,
fc4eba58
HFS		 259 .force_mld_version = 0,
260 .mldv1_unsolicited_report_interval = 10 * HZ,
261 .mldv2_unsolicited_report_interval = HZ,
1da177e4
LT		 262 .dad_transmits = 1,
263 .rtr_solicits = MAX_RTR_SOLICITATIONS,
264 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
bd11f074 265 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
1da177e4 266 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
1da177e4
LT		 267 .use_tempaddr = 0,
268 .temp_valid_lft = TEMP_VALID_LIFETIME,
269 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
270 .regen_max_retry = REGEN_MAX_RETRY,
271 .max_desync_factor = MAX_DESYNC_FACTOR,
1da177e4 272 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 273 .accept_ra_defrtr = 1,
d9333196 274 .accept_ra_from_local = 0,
8013d1d7 275 .accept_ra_min_hop_limit= 1,
c4fd30eb 276 .accept_ra_pinfo = 1,
930d6ff2
YH		 277#ifdef CONFIG_IPV6_ROUTER_PREF
278 .accept_ra_rtr_pref = 1,
52e16356 279 .rtr_probe_interval = 60 * HZ,
09c884d4 280#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 281 .accept_ra_rt_info_min_plen = 0,
09c884d4
YH		 282 .accept_ra_rt_info_max_plen = 0,
283#endif
930d6ff2 284#endif
fbea49e1 285 .proxy_ndp = 0,
0bcbc926 286 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 287 .disable_ipv6 = 0,
1b34be74 288 .accept_dad = 1,
b800c3b9 289 .suppress_frag_ndisc = 1,
c2943f14 290 .accept_ra_mtu = 1,
3d1bec99
HFS		 291 .stable_secret = {
292 .initialized = false,
293 },
3985e8a3 294 .use_oif_addrs_only = 0,
35103d11 295 .ignore_routes_with_linkdown = 0,
f1705ec1 296 .keep_addr_on_down = 0,
1ababeba 297 .seg6_enabled = 0,
bf355b8d
DL		 298#ifdef CONFIG_IPV6_SEG6_HMAC
299 .seg6_require_hmac = 0,
300#endif
adc176c5 301 .enhanced_dad = 1,
d35a00b8 302 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
df789fe7 303 .disable_policy = 0,
1da177e4
LT		 304};
305
1f372c7b
MM		 306/* Check if link is ready: is it up and is a valid qdisc available */
307static inline bool addrconf_link_ready(const struct net_device *dev)
f24e3d65 308{
1f372c7b 309 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
f24e3d65
MC		 310}
311
b7b1bfce 312static void addrconf_del_rs_timer(struct inet6_dev *idev)
1da177e4 313{
b7b1bfce
HFS		 314 if (del_timer(&idev->rs_timer))
315 __in6_dev_put(idev);
316}
317
c15b1cca 318static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
b7b1bfce 319{
c15b1cca 320 if (cancel_delayed_work(&ifp->dad_work))
1da177e4
LT		 321 __in6_ifa_put(ifp);
322}
323
b7b1bfce
HFS		 324static void addrconf_mod_rs_timer(struct inet6_dev *idev,
325 unsigned long when)
326{
327 if (!timer_pending(&idev->rs_timer))
328 in6_dev_hold(idev);
329 mod_timer(&idev->rs_timer, jiffies + when);
330}
1da177e4 331
c15b1cca
HFS		 332static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
333 unsigned long delay)
1da177e4 334{
f8a894b2
XL		 335 in6_ifa_hold(ifp);
336 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
337 in6_ifa_put(ifp);
1da177e4
LT		 338}
339
7f7d9a6b
HX		 340static int snmp6_alloc_dev(struct inet6_dev *idev)
341{
827da44c
JS		 342 int i;
343
698365fa
WC		 344 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
345 if (!idev->stats.ipv6)
7f7d9a6b 346 goto err_ip;
827da44c
JS		 347
348 for_each_possible_cpu(i) {
349 struct ipstats_mib *addrconf_stats;
698365fa 350 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
827da44c 351 u64_stats_init(&addrconf_stats->syncp);
827da44c
JS		 352 }
353
354
be281e55
ED		 355 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
356 GFP_KERNEL);
357 if (!idev->stats.icmpv6dev)
7f7d9a6b 358 goto err_icmp;
be281e55
ED		 359 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
360 GFP_KERNEL);
361 if (!idev->stats.icmpv6msgdev)
14878f75 362 goto err_icmpmsg;
7f7d9a6b
HX		 363
364 return 0;
365
14878f75 366err_icmpmsg:
be281e55 367 kfree(idev->stats.icmpv6dev);
7f7d9a6b 368err_icmp:
698365fa 369 free_percpu(idev->stats.ipv6);
7f7d9a6b 370err_ip:
aaf70ec7 371 return -ENOMEM;
7f7d9a6b
HX		 372}
373
8e5e8f30 374static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 375{
376 struct inet6_dev *ndev;
a317a2f1 377 int err = -ENOMEM;
1da177e4
LT		 378
379 ASSERT_RTNL();
380
381 if (dev->mtu < IPV6_MIN_MTU)
a317a2f1 382 return ERR_PTR(-EINVAL);
1da177e4 383
1ab1457c 384 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
63159f29 385 if (!ndev)
a317a2f1 386 return ERR_PTR(err);
322f74a4
IO		 387
388 rwlock_init(&ndev->lock);
389 ndev->dev = dev;
502a2ffd 390 INIT_LIST_HEAD(&ndev->addr_list);
b7b1bfce
HFS		 391 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
392 (unsigned long)ndev);
c346dca1 393 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
9b29c696
HFS		 394
395 if (ndev->cnf.stable_secret.initialized)
d35a00b8 396 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
9b29c696 397 else
d35a00b8 398 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode;
9b29c696 399
322f74a4 400 ndev->cnf.mtu6 = dev->mtu;
322f74a4 401 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
63159f29 402 if (!ndev->nd_parms) {
322f74a4 403 kfree(ndev);
a317a2f1 404 return ERR_PTR(err);
322f74a4 405 }
0187bdfb
BH		 406 if (ndev->cnf.forwarding)
407 dev_disable_lro(dev);
322f74a4
IO		 408 /* We refer to the device */
409 dev_hold(dev);
1da177e4 410
322f74a4 411 if (snmp6_alloc_dev(ndev) < 0) {
ba3542e1 412 ADBG(KERN_WARNING
f3213831 413 "%s: cannot allocate memory for statistics; dev=%s.\n",
ba3542e1 414 __func__, dev->name);
322f74a4 415 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 416 dev_put(dev);
417 kfree(ndev);
a317a2f1 418 return ERR_PTR(err);
322f74a4 419 }
1da177e4 420
322f74a4 421 if (snmp6_register_dev(ndev) < 0) {
ba3542e1 422 ADBG(KERN_WARNING
f3213831 423 "%s: cannot create /proc/net/dev_snmp6/%s\n",
ba3542e1 424 __func__, dev->name);
a317a2f1 425 goto err_release;
322f74a4
IO		 426 }
427
9d6280da 428 /* One reference from device. */
1be92460 429 refcount_set(&ndev->refcnt, 1);
1da177e4 430
1b34be74
YH		 431 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
432 ndev->cnf.accept_dad = -1;
433
07a93626 434#if IS_ENABLED(CONFIG_IPV6_SIT)
b077d7ab 435 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 436 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 437 ndev->cnf.rtr_solicits = 0;
438 }
439#endif
440
372e6c8f 441 INIT_LIST_HEAD(&ndev->tempaddr_list);
76506a98 442 ndev->desync_factor = U32_MAX;
322f74a4
IO		 443 if ((dev->flags&IFF_LOOPBACK) ||
444 dev->type == ARPHRD_TUNNEL ||
9625ed72 445 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 446 dev->type == ARPHRD_SIT ||
0be669bb 447 dev->type == ARPHRD_NONE) {
322f74a4 448 ndev->cnf.use_tempaddr = -1;
9d6280da
JB		 449 } else
450 ipv6_regen_rndid(ndev);
5d9efa7e 451
914faa14 452 ndev->token = in6addr_any;
1da177e4 453
1f372c7b 454 if (netif_running(dev) && addrconf_link_ready(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
8ef802aa 948 list_add_tail_rcu(&ifp->if_list, p);
e55ffac6
BH		 949}
950
ddbe5032 951static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 952{
ddbe5032 953 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 954}
955
1da177e4
LT		 956/* On success it returns ifp with increased reference count */
957
958static struct inet6_ifaddr *
3f8f5298
JP		 959ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
960 const struct in6_addr *peer_addr, int pfxlen,
8a226b2c 961 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
1da177e4 962{
df789fe7 963 struct net *net = dev_net(idev->dev);
1da177e4
LT		 964 struct inet6_ifaddr *ifa = NULL;
965 struct rt6_info *rt;
3ad7d246 966 struct in6_validator_info i6vi;
3a88a81d 967 unsigned int hash;
1da177e4 968 int err = 0;
d68b8270
YH		 969 int addr_type = ipv6_addr_type(addr);
970
971 if (addr_type == IPV6_ADDR_ANY ||
972 addr_type & IPV6_ADDR_MULTICAST ||
973 (!(idev->dev->flags & IFF_LOOPBACK) &&
974 addr_type & IPV6_ADDR_LOOPBACK))
975 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 976
8814c4b5 977 rcu_read_lock_bh();
3ad7d246
KJ		 978
979 in6_dev_hold(idev);
980
1da177e4
LT		 981 if (idev->dead) {
982 err = -ENODEV; /*XXX*/
983 goto out2;
984 }
985
56d417b1 986 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 987 err = -EACCES;
988 goto out2;
989 }
990
3ad7d246
KJ		 991 i6vi.i6vi_addr = *addr;
992 i6vi.i6vi_dev = idev;
993 rcu_read_unlock_bh();
994
995 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
996
997 rcu_read_lock_bh();
998 err = notifier_to_errno(err);
999 if (err)
1000 goto out2;
1001
5c578aed 1002 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 1003
1004 /* Ignore adding duplicate addresses on an interface */
c346dca1 1005 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
ba3542e1 1006 ADBG("ipv6_add_addr: already assigned\n");
1da177e4
LT		 1007 err = -EEXIST;
1008 goto out;
1009 }
1010
322f74a4 1011 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4 1012
63159f29 1013 if (!ifa) {
ba3542e1 1014 ADBG("ipv6_add_addr: malloc failed\n");
1da177e4
LT		 1015 err = -ENOBUFS;
1016 goto out;
1017 }
1018
8f031519 1019 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 1020 if (IS_ERR(rt)) {
1021 err = PTR_ERR(rt);
1022 goto out;
1023 }
1024
df789fe7
DF		 1025 if (net->ipv6.devconf_all->disable_policy ||
1026 idev->cnf.disable_policy)
1027 rt->dst.flags |= DST_NOPOLICY;
1028
bba24896
JP		 1029 neigh_parms_data_state_setall(idev->nd_parms);
1030
4e3fd7a0 1031 ifa->addr = *addr;
3f8f5298
JP		 1032 if (peer_addr)
1033 ifa->peer_addr = *peer_addr;
1da177e4
LT		 1034
1035 spin_lock_init(&ifa->lock);
c15b1cca 1036 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
c2e21293 1037 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 1038 ifa->scope = scope;
1039 ifa->prefix_len = pfxlen;
66eb9f86
MB		 1040 ifa->flags = flags;
1041 /* No need to add the TENTATIVE flag for addresses with NODAD */
1042 if (!(flags & IFA_F_NODAD))
1043 ifa->flags |= IFA_F_TENTATIVE;
8a226b2c
JB		 1044 ifa->valid_lft = valid_lft;
1045 ifa->prefered_lft = prefered_lft;
1da177e4 1046 ifa->cstamp = ifa->tstamp = jiffies;
617fe29d 1047 ifa->tokenized = false;
1da177e4 1048
57f5f544
KF		 1049 ifa->rt = rt;
1050
1da177e4 1051 ifa->idev = idev;
1da177e4 1052 /* For caller */
271201c0 1053 refcount_set(&ifa->refcnt, 1);
1da177e4
LT		 1054
1055 /* Add to big hash table */
ddbe5032 1056 hash = inet6_addr_hash(addr);
1da177e4 1057
5c578aed 1058 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 1059 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 1060
1061 write_lock(&idev->lock);
1062 /* Add to inet6_dev unicast addr list. */
e55ffac6 1063 ipv6_link_dev_addr(idev, ifa);
1da177e4 1064
1da177e4 1065 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 1066 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 1067 in6_ifa_hold(ifa);
1068 }
1da177e4 1069
1da177e4
LT		 1070 in6_ifa_hold(ifa);
1071 write_unlock(&idev->lock);
1072out2:
8814c4b5 1073 rcu_read_unlock_bh();
1da177e4 1074
fd92833a 1075 if (likely(err == 0))
f88c91dd 1076 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1da177e4
LT		 1077 else {
1078 kfree(ifa);
3ad7d246 1079 in6_dev_put(idev);
1da177e4
LT		 1080 ifa = ERR_PTR(err);
1081 }
1082
1083 return ifa;
1084out:
5c578aed 1085 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 1086 goto out2;
1087}
1088
5b84efec
TH		 1089enum cleanup_prefix_rt_t {
1090 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1091 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1092 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1093};
1094
1095/*
1096 * Check, whether the prefix for ifp would still need a prefix route
1097 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1098 * constants.
1099 *
1100 * 1) we don't purge prefix if address was not permanent.
1101 * prefix is managed by its own lifetime.
1102 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1103 * 3) if there are no addresses, delete prefix.
1104 * 4) if there are still other permanent address(es),
1105 * corresponding prefix is still permanent.
1106 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1107 * don't purge the prefix, assume user space is managing it.
1108 * 6) otherwise, update prefix lifetime to the
1109 * longest valid lifetime among the corresponding
1110 * addresses on the device.
1111 * Note: subsequent RA will update lifetime.
1112 **/
1113static enum cleanup_prefix_rt_t
1114check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1115{
1116 struct inet6_ifaddr *ifa;
1117 struct inet6_dev *idev = ifp->idev;
1118 unsigned long lifetime;
1119 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1120
1121 *expires = jiffies;
1122
1123 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1124 if (ifa == ifp)
1125 continue;
1126 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1127 ifp->prefix_len))
1128 continue;
1129 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1130 return CLEANUP_PREFIX_RT_NOP;
1131
1132 action = CLEANUP_PREFIX_RT_EXPIRE;
1133
1134 spin_lock(&ifa->lock);
1135
1136 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1137 /*
1138 * Note: Because this address is
1139 * not permanent, lifetime <
1140 * LONG_MAX / HZ here.
1141 */
1142 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1143 *expires = ifa->tstamp + lifetime * HZ;
1144 spin_unlock(&ifa->lock);
1145 }
1146
1147 return action;
1148}
1149
1150static void
1151cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1152{
1153 struct rt6_info *rt;
1154
1155 rt = addrconf_get_prefix_route(&ifp->addr,
1156 ifp->prefix_len,
1157 ifp->idev->dev,
1158 0, RTF_GATEWAY | RTF_DEFAULT);
1159 if (rt) {
1160 if (del_rt)
1161 ip6_del_rt(rt);
1162 else {
1163 if (!(rt->rt6i_flags & RTF_EXPIRES))
1164 rt6_set_expires(rt, expires);
1165 ip6_rt_put(rt);
1166 }
1167 }
1168}
1169
1170
1da177e4
LT		 1171/* This function wants to get referenced ifp and releases it before return */
1172
1173static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1174{
4c5ff6a6 1175 int state;
5b84efec
TH		 1176 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1177 unsigned long expires;
1da177e4 1178
c15b1cca
HFS		 1179 ASSERT_RTNL();
1180
8e8e676d 1181 spin_lock_bh(&ifp->lock);
4c5ff6a6 1182 state = ifp->state;
e9d3e084 1183 ifp->state = INET6_IFADDR_STATE_DEAD;
8e8e676d 1184 spin_unlock_bh(&ifp->lock);
4c5ff6a6
HX		 1185
1186 if (state == INET6_IFADDR_STATE_DEAD)
1187 goto out;
1da177e4 1188
5c578aed 1189 spin_lock_bh(&addrconf_hash_lock);
1190 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 1191 spin_unlock_bh(&addrconf_hash_lock);
1da177e4 1192
5b84efec 1193 write_lock_bh(&ifp->idev->lock);
5d9efa7e 1194
1da177e4 1195 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 1196 list_del(&ifp->tmp_list);
1197 if (ifp->ifpub) {
1198 in6_ifa_put(ifp->ifpub);
1199 ifp->ifpub = NULL;
1da177e4 1200 }
372e6c8f 1201 __in6_ifa_put(ifp);
1da177e4 1202 }
1da177e4 1203
5b84efec
TH		 1204 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1205 action = check_cleanup_prefix_route(ifp, &expires);
502a2ffd 1206
8ef802aa 1207 list_del_rcu(&ifp->if_list);
5b84efec
TH		 1208 __in6_ifa_put(ifp);
1209
1210 write_unlock_bh(&ifp->idev->lock);
1da177e4 1211
c15b1cca 1212 addrconf_del_dad_work(ifp);
b2238566 1213
1da177e4
LT		 1214 ipv6_ifa_notify(RTM_DELADDR, ifp);
1215
f88c91dd 1216 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1da177e4 1217
5b84efec
TH		 1218 if (action != CLEANUP_PREFIX_RT_NOP) {
1219 cleanup_prefix_route(ifp, expires,
1220 action == CLEANUP_PREFIX_RT_DEL);
1da177e4
LT		 1221 }
1222
c3968a85
DW		 1223 /* clean up prefsrc entries */
1224 rt6_remove_prefsrc(ifp);
4c5ff6a6 1225out:
1da177e4
LT		 1226 in6_ifa_put(ifp);
1227}
1228
1da177e4
LT		 1229static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1230{
1231 struct inet6_dev *idev = ifp->idev;
1232 struct in6_addr addr, *tmpaddr;
76f793e3 1233 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 1234 unsigned long regen_advance;
1da177e4
LT		 1235 int tmp_plen;
1236 int ret = 0;
95c385b4 1237 u32 addr_flags;
76f793e3 1238 unsigned long now = jiffies;
76506a98 1239 long max_desync_factor;
7aa8e63f 1240 s32 cnf_temp_preferred_lft;
1da177e4 1241
53bd6749 1242 write_lock_bh(&idev->lock);
1da177e4
LT		 1243 if (ift) {
1244 spin_lock_bh(&ift->lock);
1245 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1246 spin_unlock_bh(&ift->lock);
1247 tmpaddr = &addr;
1248 } else {
1249 tmpaddr = NULL;
1250 }
1251retry:
1252 in6_dev_hold(idev);
1253 if (idev->cnf.use_tempaddr <= 0) {
53bd6749 1254 write_unlock_bh(&idev->lock);
f3213831 1255 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 1256 in6_dev_put(idev);
1257 ret = -1;
1258 goto out;
1259 }
1260 spin_lock_bh(&ifp->lock);
1261 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1262 idev->cnf.use_tempaddr = -1; /*XXX*/
1263 spin_unlock_bh(&ifp->lock);
53bd6749 1264 write_unlock_bh(&idev->lock);
f3213831
JP		 1265 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1266 __func__);
1da177e4
LT		 1267 in6_dev_put(idev);
1268 ret = -1;
1269 goto out;
1270 }
1271 in6_ifa_hold(ifp);
1272 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
9d6280da 1273 ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 1274 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 1275 age = (now - ifp->tstamp) / HZ;
76506a98
JB		 1276
1277 regen_advance = idev->cnf.regen_max_retry *
1278 idev->cnf.dad_transmits *
1279 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1280
1281 /* recalculate max_desync_factor each time and update
1282 * idev->desync_factor if it's larger
1283 */
7aa8e63f 1284 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
76506a98
JB		 1285 max_desync_factor = min_t(__u32,
1286 idev->cnf.max_desync_factor,
7aa8e63f 1287 cnf_temp_preferred_lft - regen_advance);
76506a98
JB		 1288
1289 if (unlikely(idev->desync_factor > max_desync_factor)) {
1290 if (max_desync_factor > 0) {
1291 get_random_bytes(&idev->desync_factor,
1292 sizeof(idev->desync_factor));
1293 idev->desync_factor %= max_desync_factor;
1294 } else {
1295 idev->desync_factor = 0;
1296 }
1297 }
1298
1da177e4
LT		 1299 tmp_valid_lft = min_t(__u32,
1300 ifp->valid_lft,
7a876b0e 1301 idev->cnf.temp_valid_lft + age);
7aa8e63f 1302 tmp_prefered_lft = cnf_temp_preferred_lft + age -
76506a98 1303 idev->desync_factor;
76506a98 1304 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1da177e4 1305 tmp_plen = ifp->prefix_len;
1da177e4
LT		 1306 tmp_tstamp = ifp->tstamp;
1307 spin_unlock_bh(&ifp->lock);
1308
53bd6749 1309 write_unlock_bh(&idev->lock);
95c385b4 1310
eac55bf9
BB		 1311 /* A temporary address is created only if this calculated Preferred
1312 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1313 * an implementation must not create a temporary address with a zero
1314 * Preferred Lifetime.
ecab6701
HK		 1315 * Use age calculation as in addrconf_verify to avoid unnecessary
1316 * temporary addresses being generated.
eac55bf9 1317 */
ecab6701
HK		 1318 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1319 if (tmp_prefered_lft <= regen_advance + age) {
eac55bf9
BB		 1320 in6_ifa_put(ifp);
1321 in6_dev_put(idev);
1322 ret = -1;
1323 goto out;
1324 }
1325
95c385b4
NH		 1326 addr_flags = IFA_F_TEMPORARY;
1327 /* set in addrconf_prefix_rcv() */
1328 if (ifp->flags & IFA_F_OPTIMISTIC)
1329 addr_flags |= IFA_F_OPTIMISTIC;
1330
4b08a8f1
HFS		 1331 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1332 ipv6_addr_scope(&addr), addr_flags,
1333 tmp_valid_lft, tmp_prefered_lft);
1334 if (IS_ERR(ift)) {
1da177e4
LT		 1335 in6_ifa_put(ifp);
1336 in6_dev_put(idev);
f3213831 1337 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4 1338 tmpaddr = &addr;
53bd6749 1339 write_lock_bh(&idev->lock);
1da177e4
LT		 1340 goto retry;
1341 }
1342
1343 spin_lock_bh(&ift->lock);
1344 ift->ifpub = ifp;
76f793e3 1345 ift->cstamp = now;
1da177e4
LT		 1346 ift->tstamp = tmp_tstamp;
1347 spin_unlock_bh(&ift->lock);
1348
cf22f9a2 1349 addrconf_dad_start(ift);
1da177e4
LT		 1350 in6_ifa_put(ift);
1351 in6_dev_put(idev);
1352out:
1353 return ret;
1354}
1da177e4
LT		 1355
1356/*
072047e4 1357 * Choose an appropriate source address (RFC3484)
1da177e4 1358 */
a9b05723
YH		 1359enum {
1360 IPV6_SADDR_RULE_INIT = 0,
1361 IPV6_SADDR_RULE_LOCAL,
1362 IPV6_SADDR_RULE_SCOPE,
1363 IPV6_SADDR_RULE_PREFERRED,
1364#ifdef CONFIG_IPV6_MIP6
1365 IPV6_SADDR_RULE_HOA,
1366#endif
1367 IPV6_SADDR_RULE_OIF,
1368 IPV6_SADDR_RULE_LABEL,
a9b05723 1369 IPV6_SADDR_RULE_PRIVACY,
a9b05723
YH		 1370 IPV6_SADDR_RULE_ORCHID,
1371 IPV6_SADDR_RULE_PREFIX,
7fd2561e
EK		 1372#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1373 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1374#endif
a9b05723
YH		 1375 IPV6_SADDR_RULE_MAX
1376};
1377
072047e4 1378struct ipv6_saddr_score {
a9b05723
YH		 1379 int rule;
1380 int addr_type;
1381 struct inet6_ifaddr *ifa;
1382 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1383 int scopedist;
1384 int matchlen;
072047e4
YH		 1385};
1386
a9b05723 1387struct ipv6_saddr_dst {
9acd9f3a 1388 const struct in6_addr *addr;
a9b05723
YH		 1389 int ifindex;
1390 int scope;
1391 int label;
7cbca67c 1392 unsigned int prefs;
a9b05723 1393};
072047e4 1394
b6f99a21 1395static inline int ipv6_saddr_preferred(int type)
1da177e4 1396{
45bb0060 1397 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 1398 return 1;
1399 return 0;
1da177e4
LT		 1400}
1401
35e015e1
MC		 1402static bool ipv6_use_optimistic_addr(struct net *net,
1403 struct inet6_dev *idev)
7fd2561e
EK		 1404{
1405#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 1406 if (!idev)
1407 return false;
1408 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1409 return false;
1410 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1411 return false;
1412
1413 return true;
7fd2561e
EK		 1414#else
1415 return false;
1416#endif
1417}
1418
3de23255
BT		 1419static int ipv6_get_saddr_eval(struct net *net,
1420 struct ipv6_saddr_score *score,
a9b05723
YH		 1421 struct ipv6_saddr_dst *dst,
1422 int i)
1423{
1424 int ret;
1425
1426 if (i <= score->rule) {
1427 switch (i) {
1428 case IPV6_SADDR_RULE_SCOPE:
1429 ret = score->scopedist;
1430 break;
1431 case IPV6_SADDR_RULE_PREFIX:
1432 ret = score->matchlen;
1433 break;
1434 default:
1435 ret = !!test_bit(i, score->scorebits);
1436 }
1437 goto out;
1438 }
1439
1440 switch (i) {
1441 case IPV6_SADDR_RULE_INIT:
1442 /* Rule 0: remember if hiscore is not ready yet */
1443 ret = !!score->ifa;
1444 break;
1445 case IPV6_SADDR_RULE_LOCAL:
1446 /* Rule 1: Prefer same address */
1447 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1448 break;
1449 case IPV6_SADDR_RULE_SCOPE:
1450 /* Rule 2: Prefer appropriate scope
1451 *
1452 * ret
1453 * ^
1454 * -1 | d 15
1455 * ---+--+-+---> scope
1456 * |
1457 * | d is scope of the destination.
1458 * B-d | \
1459 * | \ <- smaller scope is better if
db9c7c39 1460 * B-15 | \ if scope is enough for destination.
a9b05723
YH		 1461 * | ret = B - scope (-1 <= scope >= d <= 15).
1462 * d-C-1 | /
1463 * |/ <- greater is better
1464 * -C / if scope is not enough for destination.
1465 * /| ret = scope - C (-1 <= d < scope <= 15).
1466 *
1467 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1468 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1469 * Assume B = 0 and we get C > 29.
1470 */
1471 ret = __ipv6_addr_src_scope(score->addr_type);
1472 if (ret >= dst->scope)
1473 ret = -ret;
1474 else
1475 ret -= 128; /* 30 is enough */
1476 score->scopedist = ret;
1477 break;
1478 case IPV6_SADDR_RULE_PREFERRED:
7fd2561e 1479 {
a9b05723 1480 /* Rule 3: Avoid deprecated and optimistic addresses */
7fd2561e
EK		 1481 u8 avoid = IFA_F_DEPRECATED;
1482
35e015e1 1483 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
7fd2561e 1484 avoid |= IFA_F_OPTIMISTIC;
a9b05723 1485 ret = ipv6_saddr_preferred(score->addr_type) ||
7fd2561e 1486 !(score->ifa->flags & avoid);
a9b05723 1487 break;
7fd2561e 1488 }
a9b05723
YH		 1489#ifdef CONFIG_IPV6_MIP6
1490 case IPV6_SADDR_RULE_HOA:
7cbca67c 1491 {
a9b05723 1492 /* Rule 4: Prefer home address */
7cbca67c
YH		 1493 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1494 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1495 break;
7cbca67c 1496 }
a9b05723
YH		 1497#endif
1498 case IPV6_SADDR_RULE_OIF:
1499 /* Rule 5: Prefer outgoing interface */
1500 ret = (!dst->ifindex ||
1501 dst->ifindex == score->ifa->idev->dev->ifindex);
1502 break;
1503 case IPV6_SADDR_RULE_LABEL:
1504 /* Rule 6: Prefer matching label */
3de23255
BT		 1505 ret = ipv6_addr_label(net,
1506 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1507 score->ifa->idev->dev->ifindex) == dst->label;
1508 break;
a9b05723 1509 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1510 {
a9b05723 1511 /* Rule 7: Prefer public address
25985edc 1512 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1513 */
7cbca67c
YH		 1514 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1515 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1516 score->ifa->idev->cnf.use_tempaddr >= 2;
1517 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1518 break;
7cbca67c 1519 }
a9b05723
YH		 1520 case IPV6_SADDR_RULE_ORCHID:
1521 /* Rule 8-: Prefer ORCHID vs ORCHID or
1522 * non-ORCHID vs non-ORCHID
1523 */
1524 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1525 ipv6_addr_orchid(dst->addr));
1526 break;
1527 case IPV6_SADDR_RULE_PREFIX:
1528 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1529 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1530 if (ret > score->ifa->prefix_len)
1531 ret = score->ifa->prefix_len;
1532 score->matchlen = ret;
a9b05723 1533 break;
7fd2561e
EK		 1534#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1535 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1536 /* Optimistic addresses still have lower precedence than other
1537 * preferred addresses.
1538 */
1539 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1540 break;
1541#endif
a9b05723
YH		 1542 default:
1543 ret = 0;
1544 }
1545
1546 if (ret)
1547 __set_bit(i, score->scorebits);
1548 score->rule = i;
1549out:
1550 return ret;
1551}
1552
c0b8da1e
YH		 1553static int __ipv6_dev_get_saddr(struct net *net,
1554 struct ipv6_saddr_dst *dst,
c0b8da1e
YH		 1555 struct inet6_dev *idev,
1556 struct ipv6_saddr_score *scores,
1557 int hiscore_idx)
9131f3de 1558{
c0b8da1e 1559 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
9131f3de
YH		 1560
1561 read_lock_bh(&idev->lock);
1562 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1563 int i;
1564
1565 /*
1566 * - Tentative Address (RFC2462 section 5.4)
1567 * - A tentative address is not considered
1568 * "assigned to an interface" in the traditional
1569 * sense, unless it is also flagged as optimistic.
1570 * - Candidate Source Address (section 4)
1571 * - In any case, anycast addresses, multicast
1572 * addresses, and the unspecified address MUST
1573 * NOT be included in a candidate set.
1574 */
1575 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1576 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1577 continue;
1578
1579 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1580
1581 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1582 score->addr_type & IPV6_ADDR_MULTICAST)) {
1583 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1584 idev->dev->name);
1585 continue;
1586 }
1587
1588 score->rule = -1;
1589 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1590
1591 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1592 int minihiscore, miniscore;
1593
1594 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1595 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1596
1597 if (minihiscore > miniscore) {
1598 if (i == IPV6_SADDR_RULE_SCOPE &&
1599 score->scopedist > 0) {
1600 /*
1601 * special case:
1602 * each remaining entry
1603 * has too small (not enough)
1604 * scope, because ifa entries
1605 * are sorted by their scope
1606 * values.
1607 */
1608 goto out;
1609 }
1610 break;
1611 } else if (minihiscore < miniscore) {
1612 if (hiscore->ifa)
1613 in6_ifa_put(hiscore->ifa);
1614
1615 in6_ifa_hold(score->ifa);
1616
1617 swap(hiscore, score);
c0b8da1e 1618 hiscore_idx = 1 - hiscore_idx;
9131f3de
YH		 1619
1620 /* restore our iterator */
1621 score->ifa = hiscore->ifa;
1622
1623 break;
1624 }
1625 }
1626 }
1627out:
1628 read_unlock_bh(&idev->lock);
c0b8da1e 1629 return hiscore_idx;
9131f3de
YH		 1630}
1631
afbac601
DA		 1632static int ipv6_get_saddr_master(struct net *net,
1633 const struct net_device *dst_dev,
1634 const struct net_device *master,
1635 struct ipv6_saddr_dst *dst,
1636 struct ipv6_saddr_score *scores,
1637 int hiscore_idx)
1638{
1639 struct inet6_dev *idev;
1640
1641 idev = __in6_dev_get(dst_dev);
1642 if (idev)
1643 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1644 scores, hiscore_idx);
1645
1646 idev = __in6_dev_get(master);
1647 if (idev)
1648 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1649 scores, hiscore_idx);
1650
1651 return hiscore_idx;
1652}
1653
b3f644fc 1654int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1655 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1656 struct in6_addr *saddr)
1da177e4 1657{
c0b8da1e 1658 struct ipv6_saddr_score scores[2], *hiscore;
a9b05723 1659 struct ipv6_saddr_dst dst;
9131f3de 1660 struct inet6_dev *idev;
072047e4 1661 struct net_device *dev;
a9b05723 1662 int dst_type;
9131f3de 1663 bool use_oif_addr = false;
c0b8da1e 1664 int hiscore_idx = 0;
1da177e4 1665
a9b05723
YH		 1666 dst_type = __ipv6_addr_type(daddr);
1667 dst.addr = daddr;
1668 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1669 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1670 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1671 dst.prefs = prefs;
a9b05723 1672
c0b8da1e
YH		 1673 scores[hiscore_idx].rule = -1;
1674 scores[hiscore_idx].ifa = NULL;
1da177e4 1675
8814c4b5 1676 rcu_read_lock();
1da177e4 1677
9131f3de
YH		 1678 /* Candidate Source Address (section 4)
1679 * - multicast and link-local destination address,
1680 * the set of candidate source address MUST only
1681 * include addresses assigned to interfaces
1682 * belonging to the same link as the outgoing
1683 * interface.
1684 * (- For site-local destination addresses, the
1685 * set of candidate source addresses MUST only
1686 * include addresses assigned to interfaces
1687 * belonging to the same site as the outgoing
1688 * interface.)
3985e8a3
EK		 1689 * - "It is RECOMMENDED that the candidate source addresses
1690 * be the set of unicast addresses assigned to the
1691 * interface that will be used to send to the destination
1692 * (the 'outgoing' interface)." (RFC 6724)
9131f3de
YH		 1693 */
1694 if (dst_dev) {
3985e8a3 1695 idev = __in6_dev_get(dst_dev);
9131f3de 1696 if ((dst_type & IPV6_ADDR_MULTICAST) ||
3985e8a3
EK		 1697 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1698 (idev && idev->cnf.use_oif_addrs_only)) {
9131f3de
YH		 1699 use_oif_addr = true;
1700 }
1701 }
a9b05723 1702
9131f3de 1703 if (use_oif_addr) {
c0b8da1e 1704 if (idev)
c15df306 1705 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
9131f3de 1706 } else {
afbac601
DA		 1707 const struct net_device *master;
1708 int master_idx = 0;
1709
1710 /* if dst_dev exists and is enslaved to an L3 device, then
1711 * prefer addresses from dst_dev and then the master over
1712 * any other enslaved devices in the L3 domain.
1713 */
1714 master = l3mdev_master_dev_rcu(dst_dev);
1715 if (master) {
1716 master_idx = master->ifindex;
1717
1718 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1719 master, &dst,
1720 scores, hiscore_idx);
1721
1722 if (scores[hiscore_idx].ifa)
1723 goto out;
1724 }
1725
9131f3de 1726 for_each_netdev_rcu(net, dev) {
afbac601
DA		 1727 /* only consider addresses on devices in the
1728 * same L3 domain
1729 */
1730 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1731 continue;
9131f3de
YH		 1732 idev = __in6_dev_get(dev);
1733 if (!idev)
072047e4 1734 continue;
c15df306 1735 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1da177e4
LT		 1736 }
1737 }
afbac601
DA		 1738
1739out:
8814c4b5 1740 rcu_read_unlock();
1da177e4 1741
c0b8da1e 1742 hiscore = &scores[hiscore_idx];
a9b05723 1743 if (!hiscore->ifa)
072047e4 1744 return -EADDRNOTAVAIL;
1ab1457c 1745
4e3fd7a0 1746 *saddr = hiscore->ifa->addr;
a9b05723 1747 in6_ifa_put(hiscore->ifa);
072047e4 1748 return 0;
1da177e4 1749}
5e5f3f0f 1750EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1751
8965779d 1752int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
479840ff 1753 u32 banned_flags)
b7b1bfce
HFS		 1754{
1755 struct inet6_ifaddr *ifp;
1756 int err = -EADDRNOTAVAIL;
1757
602582ca
HFS		 1758 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1759 if (ifp->scope > IFA_LINK)
1760 break;
b7b1bfce
HFS		 1761 if (ifp->scope == IFA_LINK &&
1762 !(ifp->flags & banned_flags)) {
1763 *addr = ifp->addr;
1764 err = 0;
1765 break;
1766 }
1767 }
1768 return err;
1769}
1770
95c385b4 1771int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
479840ff 1772 u32 banned_flags)
1da177e4
LT		 1773{
1774 struct inet6_dev *idev;
1775 int err = -EADDRNOTAVAIL;
1776
8814c4b5 1777 rcu_read_lock();
e21e8467
SH		 1778 idev = __in6_dev_get(dev);
1779 if (idev) {
1da177e4 1780 read_lock_bh(&idev->lock);
b7b1bfce 1781 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1da177e4
LT		 1782 read_unlock_bh(&idev->lock);
1783 }
8814c4b5 1784 rcu_read_unlock();
1da177e4
LT		 1785 return err;
1786}
1787
1788static int ipv6_count_addresses(struct inet6_dev *idev)
1789{
1790 int cnt = 0;
1791 struct inet6_ifaddr *ifp;
1792
1793 read_lock_bh(&idev->lock);
502a2ffd 1794 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1795 cnt++;
1796 read_unlock_bh(&idev->lock);
1797 return cnt;
1798}
1799
b71d1d42 1800int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
2a7851bf 1801 const struct net_device *dev, int strict)
c58da4c6
EK		 1802{
1803 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1804}
1805EXPORT_SYMBOL(ipv6_chk_addr);
1806
1807int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1808 const struct net_device *dev, int strict,
1809 u32 banned_flags)
1da177e4 1810{
eedf042a 1811 struct inet6_ifaddr *ifp;
ddbe5032 1812 unsigned int hash = inet6_addr_hash(addr);
c58da4c6 1813 u32 ifp_flags;
1da177e4 1814
5c578aed 1815 rcu_read_lock_bh();
b67bfe0d 1816 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1817 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1818 continue;
c58da4c6
EK		 1819 /* Decouple optimistic from tentative for evaluation here.
1820 * Ban optimistic addresses explicitly, when required.
1821 */
1822 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1823 ? (ifp->flags&~IFA_F_TENTATIVE)
1824 : ifp->flags;
1da177e4 1825 if (ipv6_addr_equal(&ifp->addr, addr) &&
c58da4c6 1826 !(ifp_flags&banned_flags) &&
63159f29 1827 (!dev || ifp->idev->dev == dev ||
eedf042a
SH		 1828 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1829 rcu_read_unlock_bh();
1830 return 1;
1da177e4
LT		 1831 }
1832 }
5c578aed 1833
eedf042a
SH		 1834 rcu_read_unlock_bh();
1835 return 0;
1da177e4 1836}
c58da4c6 1837EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
7159039a 1838
3e81c6da
DM		 1839static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1840 struct net_device *dev)
1da177e4 1841{
ddbe5032 1842 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1843 struct inet6_ifaddr *ifp;
1da177e4 1844
b67bfe0d 1845 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1846 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1847 continue;
1da177e4 1848 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1849 if (!dev || ifp->idev->dev == dev)
3e81c6da 1850 return true;
1da177e4
LT		 1851 }
1852 }
3e81c6da 1853 return false;
1da177e4
LT		 1854}
1855
7df37ff3
CB		 1856/* Compares an address/prefix_len with addresses on device @dev.
1857 * If one is found it returns true.
1858 */
1859bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1860 const unsigned int prefix_len, struct net_device *dev)
1861{
1862 struct inet6_dev *idev;
1863 struct inet6_ifaddr *ifa;
1864 bool ret = false;
1865
1866 rcu_read_lock();
1867 idev = __in6_dev_get(dev);
1868 if (idev) {
1869 read_lock_bh(&idev->lock);
1870 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1871 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1872 if (ret)
1873 break;
1874 }
1875 read_unlock_bh(&idev->lock);
1876 }
1877 rcu_read_unlock();
1878
1879 return ret;
1880}
1881EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1882
b71d1d42 1883int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1884{
1885 struct inet6_dev *idev;
1886 struct inet6_ifaddr *ifa;
1887 int onlink;
1888
1889 onlink = 0;
1890 rcu_read_lock();
1891 idev = __in6_dev_get(dev);
1892 if (idev) {
1893 read_lock_bh(&idev->lock);
502a2ffd 1894 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1895 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1896 ifa->prefix_len);
1897 if (onlink)
1898 break;
1899 }
1900 read_unlock_bh(&idev->lock);
1901 }
1902 rcu_read_unlock();
1903 return onlink;
1904}
52eeeb84
YH		 1905EXPORT_SYMBOL(ipv6_chk_prefix);
1906
9acd9f3a 1907struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1908 struct net_device *dev, int strict)
1da177e4 1909{
b79d1d54 1910 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1911 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1912
5c578aed 1913 rcu_read_lock_bh();
b67bfe0d 1914 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 1915 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1916 continue;
1da177e4 1917 if (ipv6_addr_equal(&ifp->addr, addr)) {
63159f29 1918 if (!dev || ifp->idev->dev == dev ||
1da177e4 1919 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1920 result = ifp;
1da177e4
LT		 1921 in6_ifa_hold(ifp);
1922 break;
1923 }
1924 }
1925 }
5c578aed 1926 rcu_read_unlock_bh();
1da177e4 1927
b79d1d54 1928 return result;
1da177e4
LT		 1929}
1930
1da177e4
LT		 1931/* Gets referenced address, destroys ifaddr */
1932
cc411d0b 1933static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1934{
3d171f39
LR		 1935 if (dad_failed)
1936 ifp->flags |= IFA_F_DADFAILED;
1937
ec8add2a 1938 if (ifp->flags&IFA_F_TEMPORARY) {
1da177e4
LT		 1939 struct inet6_ifaddr *ifpub;
1940 spin_lock_bh(&ifp->lock);
1941 ifpub = ifp->ifpub;
1942 if (ifpub) {
1943 in6_ifa_hold(ifpub);
1944 spin_unlock_bh(&ifp->lock);
1945 ipv6_create_tempaddr(ifpub, ifp);
1946 in6_ifa_put(ifpub);
1947 } else {
1948 spin_unlock_bh(&ifp->lock);
1949 }
1950 ipv6_del_addr(ifp);
ec8add2a
SD		 1951 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
1952 spin_lock_bh(&ifp->lock);
1953 addrconf_del_dad_work(ifp);
1954 ifp->flags |= IFA_F_TENTATIVE;
1955 spin_unlock_bh(&ifp->lock);
1956 if (dad_failed)
1957 ipv6_ifa_notify(0, ifp);
1958 in6_ifa_put(ifp);
c15b1cca 1959 } else {
1da177e4 1960 ipv6_del_addr(ifp);
c15b1cca 1961 }
1da177e4
LT		 1962}
1963
f2344a13
HX		 1964static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1965{
1966 int err = -ENOENT;
1967
8e8e676d 1968 spin_lock_bh(&ifp->lock);
f2344a13
HX		 1969 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1970 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1971 err = 0;
1972 }
8e8e676d 1973 spin_unlock_bh(&ifp->lock);
f2344a13
HX		 1974
1975 return err;
1976}
1977
3c21edbd
YH		 1978void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1979{
1b34be74 1980 struct inet6_dev *idev = ifp->idev;
1855b7c3 1981 struct net *net = dev_net(ifp->idev->dev);
9bdd8d40 1982
853dc2e0
UB		 1983 if (addrconf_dad_end(ifp)) {
1984 in6_ifa_put(ifp);
f2344a13 1985 return;
853dc2e0 1986 }
f2344a13 1987
e87cc472
JP		 1988 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1989 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1990
5f40ef77
HFS		 1991 spin_lock_bh(&ifp->lock);
1992
1993 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1994 int scope = ifp->scope;
1995 u32 flags = ifp->flags;
1996 struct in6_addr new_addr;
1997 struct inet6_ifaddr *ifp2;
1998 u32 valid_lft, preferred_lft;
1999 int pfxlen = ifp->prefix_len;
5f40ef77
HFS		 2000 int retries = ifp->stable_privacy_retry + 1;
2001
1855b7c3 2002 if (retries > net->ipv6.sysctl.idgen_retries) {
5f40ef77
HFS		 2003 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2004 ifp->idev->dev->name);
2005 goto errdad;
2006 }
2007
2008 new_addr = ifp->addr;
2009 if (ipv6_generate_stable_address(&new_addr, retries,
2010 idev))
2011 goto errdad;
2012
2013 valid_lft = ifp->valid_lft;
2014 preferred_lft = ifp->prefered_lft;
2015
2016 spin_unlock_bh(&ifp->lock);
1b34be74 2017
5f40ef77
HFS		 2018 if (idev->cnf.max_addresses &&
2019 ipv6_count_addresses(idev) >=
2020 idev->cnf.max_addresses)
2021 goto lock_errdad;
2022
2023 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2024 ifp->idev->dev->name);
2025
2026 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
2027 scope, flags, valid_lft,
2028 preferred_lft);
2029 if (IS_ERR(ifp2))
2030 goto lock_errdad;
2031
2032 spin_lock_bh(&ifp2->lock);
2033 ifp2->stable_privacy_retry = retries;
2034 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2035 spin_unlock_bh(&ifp2->lock);
2036
1855b7c3 2037 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
5f40ef77
HFS		 2038 in6_ifa_put(ifp2);
2039lock_errdad:
2040 spin_lock_bh(&ifp->lock);
1b34be74
YH		 2041 }
2042
5f40ef77 2043errdad:
c15b1cca
HFS		 2044 /* transition from _POSTDAD to _ERRDAD */
2045 ifp->state = INET6_IFADDR_STATE_ERRDAD;
8e8e676d 2046 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 2047
2048 addrconf_mod_dad_work(ifp, 0);
751eb6b6 2049 in6_ifa_put(ifp);
3c21edbd 2050}
1da177e4 2051
a9ed4a29
SD		 2052/* Join to solicited addr multicast group.
2053 * caller must hold RTNL */
b71d1d42 2054void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 2055{
2056 struct in6_addr maddr;
2057
2058 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2059 return;
2060
2061 addrconf_addr_solict_mult(addr, &maddr);
2062 ipv6_dev_mc_inc(dev, &maddr);
2063}
2064
a9ed4a29 2065/* caller must hold RTNL */
b71d1d42 2066void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 2067{
2068 struct in6_addr maddr;
2069
2070 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2071 return;
2072
2073 addrconf_addr_solict_mult(addr, &maddr);
2074 __ipv6_dev_mc_dec(idev, &maddr);
2075}
2076
a9ed4a29 2077/* caller must hold RTNL */
20380731 2078static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2079{
2080 struct in6_addr addr;
c15b1cca 2081
88ad3149 2082 if (ifp->prefix_len >= 127) /* RFC 6164 */
2bda8a0c 2083 return;
1da177e4
LT		 2084 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2085 if (ipv6_addr_any(&addr))
2086 return;
013b4d90 2087 __ipv6_dev_ac_inc(ifp->idev, &addr);
1da177e4
LT		 2088}
2089
a9ed4a29 2090/* caller must hold RTNL */
20380731 2091static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 2092{
2093 struct in6_addr addr;
c15b1cca 2094
88ad3149 2095 if (ifp->prefix_len >= 127) /* RFC 6164 */
32019e65 2096 return;
1da177e4
LT		 2097 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2098 if (ipv6_addr_any(&addr))
2099 return;
2100 __ipv6_dev_ac_dec(ifp->idev, &addr);
2101}
2102
8a7a4b47 2103static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
06a4c1c5 2104{
8a7a4b47
AA		 2105 switch (dev->addr_len) {
2106 case ETH_ALEN:
9dae2e03
LAD		 2107 memcpy(eui, dev->dev_addr, 3);
2108 eui[3] = 0xFF;
2109 eui[4] = 0xFE;
2110 memcpy(eui + 5, dev->dev_addr + 3, 3);
2111 break;
8a7a4b47
AA		 2112 case EUI64_ADDR_LEN:
2113 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2114 eui[0] ^= 2;
2115 break;
2116 default:
06a4c1c5 2117 return -1;
8a7a4b47
AA		 2118 }
2119
06a4c1c5 2120 return 0;
2121}
2122
cb6bf355
YH		 2123static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2124{
2125 union fwnet_hwaddr *ha;
2126
2127 if (dev->addr_len != FWNET_ALEN)
2128 return -1;
2129
2130 ha = (union fwnet_hwaddr *)dev->dev_addr;
2131
2132 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2133 eui[0] ^= 2;
2134 return 0;
2135}
2136
073a8e0e
YH		 2137static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2138{
2139 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2140 if (dev->addr_len != ARCNET_ALEN)
2141 return -1;
2142 memset(eui, 0, 7);
8e5e8f30 2143 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 2144 return 0;
2145}
2146
2147static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2148{
2149 if (dev->addr_len != INFINIBAND_ALEN)
2150 return -1;
2151 memcpy(eui, dev->dev_addr + 12, 8);
2152 eui[0] |= 2;
2153 return 0;
2154}
2155
c61393ea 2156static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 2157{
9af28511
SH		 2158 if (addr == 0)
2159 return -1;
dfd982ba
YH		 2160 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2161 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2162 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2163 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2164 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2165 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2166 eui[1] = 0;
2167 eui[2] = 0x5E;
2168 eui[3] = 0xFE;
2169 memcpy(eui + 4, &addr, 4);
2170 return 0;
2171}
dfd982ba
YH		 2172
2173static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2174{
2175 if (dev->priv_flags & IFF_ISATAP)
2176 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2177 return -1;
2178}
2179
aee80b54 2180static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2181{
2182 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2183}
2184
e837735e
ND		 2185static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2186{
2187 memcpy(eui, dev->perm_addr, 3);
2188 memcpy(eui + 5, dev->perm_addr + 3, 3);
2189 eui[3] = 0xFF;
2190 eui[4] = 0xFE;
2191 eui[0] ^= 2;
2192 return 0;
2193}
2194
1da177e4
LT		 2195static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2196{
2197 switch (dev->type) {
2198 case ARPHRD_ETHER:
2199 case ARPHRD_FDDI:
073a8e0e 2200 return addrconf_ifid_eui48(eui, dev);
1da177e4 2201 case ARPHRD_ARCNET:
073a8e0e 2202 return addrconf_ifid_arcnet(eui, dev);
1da177e4 2203 case ARPHRD_INFINIBAND:
073a8e0e 2204 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 2205 case ARPHRD_SIT:
dfd982ba 2206 return addrconf_ifid_sit(eui, dev);
aee80b54 2207 case ARPHRD_IPGRE:
45ce0fd1 2208 case ARPHRD_TUNNEL:
aee80b54 2209 return addrconf_ifid_gre(eui, dev);
e74bccb8 2210 case ARPHRD_6LOWPAN:
8a7a4b47 2211 return addrconf_ifid_6lowpan(eui, dev);
cb6bf355
YH		 2212 case ARPHRD_IEEE1394:
2213 return addrconf_ifid_ieee1394(eui, dev);
e837735e 2214 case ARPHRD_TUNNEL6:
45ce0fd1 2215 case ARPHRD_IP6GRE:
e837735e 2216 return addrconf_ifid_ip6tnl(eui, dev);
1da177e4
LT		 2217 }
2218 return -1;
2219}
2220
2221static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2222{
2223 int err = -1;
2224 struct inet6_ifaddr *ifp;
2225
2226 read_lock_bh(&idev->lock);
602582ca
HFS		 2227 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2228 if (ifp->scope > IFA_LINK)
2229 break;
1da177e4
LT		 2230 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2231 memcpy(eui, ifp->addr.s6_addr+8, 8);
2232 err = 0;
2233 break;
2234 }
2235 }
2236 read_unlock_bh(&idev->lock);
2237 return err;
2238}
2239
1da177e4 2240/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
9d6280da 2241static void ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 2242{
1da177e4 2243regen:
955189ef 2244 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 2245 idev->rndid[0] &= ~0x02;
1da177e4
LT		 2246
2247 /*
2248 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2249 * check if generated address is not inappropriate
2250 *
2251 * - Reserved subnet anycast (RFC 2526)
2252 * 11111101 11....11 1xxxxxxx
c7dc89c0 2253 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 2254 * 00-00-5E-FE-xx-xx-xx-xx
2255 * - value 0
2256 * - XXX: already assigned to an address on the device
2257 */
1ab1457c 2258 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 2259 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2260 (idev->rndid[7]&0x80))
2261 goto regen;
2262 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2263 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2264 goto regen;
2265 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2266 goto regen;
2267 }
1da177e4
LT		 2268}
2269
9d6280da 2270static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 2271{
1da177e4 2272 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
9d6280da 2273 ipv6_regen_rndid(idev);
1da177e4 2274}
1da177e4
LT		 2275
2276/*
2277 * Add prefix route.
2278 */
2279
2280static void
2281addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 2282 unsigned long expires, u32 flags)
1da177e4 2283{
86872cb5 2284 struct fib6_config cfg = {
ca254490 2285 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
86872cb5
TG		 2286 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2287 .fc_ifindex = dev->ifindex,
2288 .fc_expires = expires,
2289 .fc_dst_len = plen,
2290 .fc_flags = RTF_UP | flags,
c346dca1 2291 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 2292 .fc_protocol = RTPROT_KERNEL,
86872cb5 2293 };
1da177e4 2294
4e3fd7a0 2295 cfg.fc_dst = *pfx;
1da177e4
LT		 2296
2297 /* Prevent useless cloning on PtP SIT.
2298 This thing is done here expecting that the whole
2299 class of non-broadcast devices need not cloning.
2300 */
07a93626 2301#if IS_ENABLED(CONFIG_IPV6_SIT)
86872cb5
TG		 2302 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2303 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 2304#endif
1da177e4 2305
333c4301 2306 ip6_route_add(&cfg, NULL);
1da177e4
LT		 2307}
2308
14ef37b6
AH		 2309
2310static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2311 int plen,
2312 const struct net_device *dev,
2313 u32 flags, u32 noflags)
2314{
2315 struct fib6_node *fn;
2316 struct rt6_info *rt = NULL;
2317 struct fib6_table *table;
ca254490 2318 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
14ef37b6 2319
ca254490 2320 table = fib6_get_table(dev_net(dev), tb_id);
63159f29 2321 if (!table)
14ef37b6
AH		 2322 return NULL;
2323
66f5d6ce 2324 rcu_read_lock();
38fbeeee 2325 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
14ef37b6
AH		 2326 if (!fn)
2327 goto out;
1f56a01f 2328
66f5d6ce 2329 for_each_fib6_node_rt_rcu(fn) {
d1918542 2330 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 2331 continue;
2332 if ((rt->rt6i_flags & flags) != flags)
2333 continue;
85da53bf 2334 if ((rt->rt6i_flags & noflags) != 0)
14ef37b6 2335 continue;
d3843fe5
WW		 2336 if (!dst_hold_safe(&rt->dst))
2337 rt = NULL;
14ef37b6
AH		 2338 break;
2339 }
2340out:
66f5d6ce 2341 rcu_read_unlock();
14ef37b6
AH		 2342 return rt;
2343}
2344
2345
1da177e4
LT		 2346/* Create "default" multicast route to the interface */
2347
2348static void addrconf_add_mroute(struct net_device *dev)
2349{
86872cb5 2350 struct fib6_config cfg = {
ca254490 2351 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
86872cb5
TG		 2352 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2353 .fc_ifindex = dev->ifindex,
2354 .fc_dst_len = 8,
2355 .fc_flags = RTF_UP,
c346dca1 2356 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 2357 };
2358
2359 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2360
333c4301 2361 ip6_route_add(&cfg, NULL);
1da177e4
LT		 2362}
2363
1da177e4
LT		 2364static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2365{
2366 struct inet6_dev *idev;
2367
2368 ASSERT_RTNL();
2369
e21e8467
SH		 2370 idev = ipv6_find_idev(dev);
2371 if (!idev)
64e724f6
BH		 2372 return ERR_PTR(-ENOBUFS);
2373
2374 if (idev->cnf.disable_ipv6)
2375 return ERR_PTR(-EACCES);
1da177e4
LT		 2376
2377 /* Add default multicast route */
ba46ee4c 2378 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
4af04aba 2379 addrconf_add_mroute(dev);
1da177e4 2380
1da177e4
LT		 2381 return idev;
2382}
2383
53bd6749
JP		 2384static void manage_tempaddrs(struct inet6_dev *idev,
2385 struct inet6_ifaddr *ifp,
2386 __u32 valid_lft, __u32 prefered_lft,
2387 bool create, unsigned long now)
2388{
2389 u32 flags;
2390 struct inet6_ifaddr *ift;
2391
2392 read_lock_bh(&idev->lock);
2393 /* update all temporary addresses in the list */
2394 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2395 int age, max_valid, max_prefered;
2396
2397 if (ifp != ift->ifpub)
2398 continue;
2399
2400 /* RFC 4941 section 3.3:
2401 * If a received option will extend the lifetime of a public
2402 * address, the lifetimes of temporary addresses should
2403 * be extended, subject to the overall constraint that no
2404 * temporary addresses should ever remain "valid" or "preferred"
2405 * for a time longer than (TEMP_VALID_LIFETIME) or
2406 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2407 */
2408 age = (now - ift->cstamp) / HZ;
2409 max_valid = idev->cnf.temp_valid_lft - age;
2410 if (max_valid < 0)
2411 max_valid = 0;
2412
2413 max_prefered = idev->cnf.temp_prefered_lft -
76506a98 2414 idev->desync_factor - age;
53bd6749
JP		 2415 if (max_prefered < 0)
2416 max_prefered = 0;
2417
2418 if (valid_lft > max_valid)
2419 valid_lft = max_valid;
2420
2421 if (prefered_lft > max_prefered)
2422 prefered_lft = max_prefered;
2423
2424 spin_lock(&ift->lock);
2425 flags = ift->flags;
2426 ift->valid_lft = valid_lft;
2427 ift->prefered_lft = prefered_lft;
2428 ift->tstamp = now;
2429 if (prefered_lft > 0)
2430 ift->flags &= ~IFA_F_DEPRECATED;
2431
2432 spin_unlock(&ift->lock);
2433 if (!(flags&IFA_F_TENTATIVE))
2434 ipv6_ifa_notify(0, ift);
2435 }
2436
2437 if ((create || list_empty(&idev->tempaddr_list)) &&
2438 idev->cnf.use_tempaddr > 0) {
2439 /* When a new public address is created as described
2440 * in [ADDRCONF], also create a new temporary address.
2441 * Also create a temporary address if it's enabled but
2442 * no temporary address currently exists.
2443 */
2444 read_unlock_bh(&idev->lock);
2445 ipv6_create_tempaddr(ifp, NULL);
2446 } else {
2447 read_unlock_bh(&idev->lock);
2448 }
2449}
2450
cc9da6cc
BM		 2451static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2452{
d35a00b8
FJ		 2453 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2454 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc
BM		 2455}
2456
cc84b3c6
AA		 2457int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2458 const struct prefix_info *pinfo,
2459 struct inet6_dev *in6_dev,
2460 const struct in6_addr *addr, int addr_type,
2461 u32 addr_flags, bool sllao, bool tokenized,
2462 __u32 valid_lft, u32 prefered_lft)
4f672235
AA		 2463{
2464 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2465 int create = 0, update_lft = 0;
2466
2467 if (!ifp && valid_lft) {
2468 int max_addresses = in6_dev->cnf.max_addresses;
2469
2470#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 2471 if ((net->ipv6.devconf_all->optimistic_dad ||
2472 in6_dev->cnf.optimistic_dad) &&
4f672235
AA		 2473 !net->ipv6.devconf_all->forwarding && sllao)
2474 addr_flags |= IFA_F_OPTIMISTIC;
2475#endif
2476
2477 /* Do not allow to create too much of autoconfigured
2478 * addresses; this would be too easy way to crash kernel.
2479 */
2480 if (!max_addresses ||
2481 ipv6_count_addresses(in6_dev) < max_addresses)
2482 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2483 pinfo->prefix_len,
2484 addr_type&IPV6_ADDR_SCOPE_MASK,
2485 addr_flags, valid_lft,
2486 prefered_lft);
2487
2488 if (IS_ERR_OR_NULL(ifp))
2489 return -1;
2490
2491 update_lft = 0;
2492 create = 1;
2493 spin_lock_bh(&ifp->lock);
2494 ifp->flags |= IFA_F_MANAGETEMPADDR;
2495 ifp->cstamp = jiffies;
2496 ifp->tokenized = tokenized;
2497 spin_unlock_bh(&ifp->lock);
2498 addrconf_dad_start(ifp);
2499 }
2500
2501 if (ifp) {
2502 u32 flags;
2503 unsigned long now;
2504 u32 stored_lft;
2505
2506 /* update lifetime (RFC2462 5.5.3 e) */
2507 spin_lock_bh(&ifp->lock);
2508 now = jiffies;
2509 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2510 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2511 else
2512 stored_lft = 0;
2513 if (!update_lft && !create && stored_lft) {
2514 const u32 minimum_lft = min_t(u32,
2515 stored_lft, MIN_VALID_LIFETIME);
2516 valid_lft = max(valid_lft, minimum_lft);
2517
2518 /* RFC4862 Section 5.5.3e:
2519 * "Note that the preferred lifetime of the
2520 * corresponding address is always reset to
2521 * the Preferred Lifetime in the received
2522 * Prefix Information option, regardless of
2523 * whether the valid lifetime is also reset or
2524 * ignored."
2525 *
2526 * So we should always update prefered_lft here.
2527 */
2528 update_lft = 1;
2529 }
2530
2531 if (update_lft) {
2532 ifp->valid_lft = valid_lft;
2533 ifp->prefered_lft = prefered_lft;
2534 ifp->tstamp = now;
2535 flags = ifp->flags;
2536 ifp->flags &= ~IFA_F_DEPRECATED;
2537 spin_unlock_bh(&ifp->lock);
2538
2539 if (!(flags&IFA_F_TENTATIVE))
2540 ipv6_ifa_notify(0, ifp);
2541 } else
2542 spin_unlock_bh(&ifp->lock);
2543
2544 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2545 create, now);
2546
2547 in6_ifa_put(ifp);
2548 addrconf_verify();
2549 }
2550
2551 return 0;
2552}
cc84b3c6 2553EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
4f672235 2554
e6bff995 2555void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 2556{
2557 struct prefix_info *pinfo;
2558 __u32 valid_lft;
2559 __u32 prefered_lft;
4f672235 2560 int addr_type, err;
64236f3f 2561 u32 addr_flags = 0;
1da177e4 2562 struct inet6_dev *in6_dev;
56d417b1 2563 struct net *net = dev_net(dev);
1da177e4
LT		 2564
2565 pinfo = (struct prefix_info *) opt;
1ab1457c 2566
1da177e4 2567 if (len < sizeof(struct prefix_info)) {
ba3542e1 2568 ADBG("addrconf: prefix option too short\n");
1da177e4
LT		 2569 return;
2570 }
1ab1457c 2571
1da177e4
LT		 2572 /*
2573 * Validation checks ([ADDRCONF], page 19)
2574 */
2575
2576 addr_type = ipv6_addr_type(&pinfo->prefix);
2577
2578 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2579 return;
2580
2581 valid_lft = ntohl(pinfo->valid);
2582 prefered_lft = ntohl(pinfo->prefered);
2583
2584 if (prefered_lft > valid_lft) {
e87cc472 2585 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 2586 return;
2587 }
2588
2589 in6_dev = in6_dev_get(dev);
2590
63159f29 2591 if (!in6_dev) {
e87cc472
JP		 2592 net_dbg_ratelimited("addrconf: device %s not configured\n",
2593 dev->name);
1da177e4
LT		 2594 return;
2595 }
2596
2597 /*
2598 * Two things going on here:
2599 * 1) Add routes for on-link prefixes
2600 * 2) Configure prefixes with the auto flag set
2601 */
2602
4bed72e4
YH		 2603 if (pinfo->onlink) {
2604 struct rt6_info *rt;
2605 unsigned long rt_expires;
2606
6f704992
YH		 2607 /* Avoid arithmetic overflow. Really, we could
2608 * save rt_expires in seconds, likely valid_lft,
2609 * but it would require division in fib gc, that it
2610 * not good.
2611 */
4bed72e4
YH		 2612 if (HZ > USER_HZ)
2613 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2614 else
2615 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 2616
4bed72e4
YH		 2617 if (addrconf_finite_timeout(rt_expires))
2618 rt_expires *= HZ;
1da177e4 2619
14ef37b6
AH		 2620 rt = addrconf_get_prefix_route(&pinfo->prefix,
2621 pinfo->prefix_len,
2622 dev,
2623 RTF_ADDRCONF | RTF_PREFIX_RT,
2624 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 2625
14ef37b6 2626 if (rt) {
6f704992
YH		 2627 /* Autoconf prefix route */
2628 if (valid_lft == 0) {
2629 ip6_del_rt(rt);
2630 rt = NULL;
4bed72e4 2631 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 2632 /* not infinity */
1716a961 2633 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 2634 } else {
1716a961 2635 rt6_clean_expires(rt);
1da177e4
LT		 2636 }
2637 } else if (valid_lft) {
6f704992 2638 clock_t expires = 0;
4bed72e4
YH		 2639 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2640 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 2641 /* not infinity */
2642 flags |= RTF_EXPIRES;
2643 expires = jiffies_to_clock_t(rt_expires);
2644 }
1da177e4 2645 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 2646 dev, expires, flags);
1da177e4 2647 }
94e187c0 2648 ip6_rt_put(rt);
1da177e4
LT		 2649 }
2650
2651 /* Try to figure out our local address for this prefix */
2652
2653 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1da177e4 2654 struct in6_addr addr;
f997c55c 2655 bool tokenized = false, dev_addr_generated = false;
1da177e4
LT		 2656
2657 if (pinfo->prefix_len == 64) {
2658 memcpy(&addr, &pinfo->prefix, 8);
f53adae4
DB		 2659
2660 if (!ipv6_addr_any(&in6_dev->token)) {
2661 read_lock_bh(&in6_dev->lock);
2662 memcpy(addr.s6_addr + 8,
2663 in6_dev->token.s6_addr + 8, 8);
2664 read_unlock_bh(&in6_dev->lock);
617fe29d 2665 tokenized = true;
cc9da6cc 2666 } else if (is_addr_mode_generate_stable(in6_dev) &&
622c81d5
HFS		 2667 !ipv6_generate_stable_address(&addr, 0,
2668 in6_dev)) {
64236f3f 2669 addr_flags |= IFA_F_STABLE_PRIVACY;
622c81d5 2670 goto ok;
f53adae4
DB		 2671 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2672 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
4f672235 2673 goto put;
f997c55c
AA		 2674 } else {
2675 dev_addr_generated = true;
1da177e4
LT		 2676 }
2677 goto ok;
2678 }
e87cc472
JP		 2679 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2680 pinfo->prefix_len);
4f672235 2681 goto put;
1da177e4
LT		 2682
2683ok:
4f672235
AA		 2684 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2685 &addr, addr_type,
2686 addr_flags, sllao,
2687 tokenized, valid_lft,
2688 prefered_lft);
2689 if (err)
2690 goto put;
f997c55c
AA		 2691
2692 /* Ignore error case here because previous prefix add addr was
2693 * successful which will be notified.
2694 */
2695 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2696 addr_type, addr_flags, sllao,
2697 tokenized, valid_lft,
2698 prefered_lft,
2699 dev_addr_generated);
1da177e4
LT		 2700 }
2701 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
4f672235 2702put:
1da177e4
LT		 2703 in6_dev_put(in6_dev);
2704}
2705
2706/*
2707 * Set destination address.
2708 * Special case for SIT interfaces where we create a new "virtual"
2709 * device.
2710 */
af284937 2711int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2712{
2713 struct in6_ifreq ireq;
2714 struct net_device *dev;
2715 int err = -EINVAL;
2716
2717 rtnl_lock();
2718
2719 err = -EFAULT;
2720 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2721 goto err_exit;
2722
af284937 2723 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2724
2725 err = -ENODEV;
63159f29 2726 if (!dev)
1da177e4
LT		 2727 goto err_exit;
2728
07a93626 2729#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4 2730 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2731 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2732 struct ifreq ifr;
1da177e4
LT		 2733 struct ip_tunnel_parm p;
2734
2735 err = -EADDRNOTAVAIL;
2736 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2737 goto err_exit;
2738
2739 memset(&p, 0, sizeof(p));
2740 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2741 p.iph.saddr = 0;
2742 p.iph.version = 4;
2743 p.iph.ihl = 5;
2744 p.iph.protocol = IPPROTO_IPV6;
2745 p.iph.ttl = 64;
d20b3109 2746 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2747
5bc3eb7e
SH		 2748 if (ops->ndo_do_ioctl) {
2749 mm_segment_t oldfs = get_fs();
2750
2751 set_fs(KERNEL_DS);
2752 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2753 set_fs(oldfs);
2754 } else
2755 err = -EOPNOTSUPP;
1da177e4
LT		 2756
2757 if (err == 0) {
2758 err = -ENOBUFS;
af284937
DL		 2759 dev = __dev_get_by_name(net, p.name);
2760 if (!dev)
1da177e4
LT		 2761 goto err_exit;
2762 err = dev_open(dev);
2763 }
2764 }
0be669bb 2765#endif
1da177e4
LT		 2766
2767err_exit:
2768 rtnl_unlock();
2769 return err;
2770}
2771
93a714d6
MC		 2772static int ipv6_mc_config(struct sock *sk, bool join,
2773 const struct in6_addr *addr, int ifindex)
2774{
2775 int ret;
2776
2777 ASSERT_RTNL();
2778
2779 lock_sock(sk);
2780 if (join)
54ff9ef3 2781 ret = ipv6_sock_mc_join(sk, ifindex, addr);
93a714d6 2782 else
54ff9ef3 2783 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
93a714d6
MC		 2784 release_sock(sk);
2785
2786 return ret;
2787}
2788
1da177e4
LT		 2789/*
2790 * Manual configuration of address on an interface
2791 */
479840ff
JP		 2792static int inet6_addr_add(struct net *net, int ifindex,
2793 const struct in6_addr *pfx,
caeaba79 2794 const struct in6_addr *peer_pfx,
479840ff
JP		 2795 unsigned int plen, __u32 ifa_flags,
2796 __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 2797{
2798 struct inet6_ifaddr *ifp;
2799 struct inet6_dev *idev;
2800 struct net_device *dev;
93a714d6
MC		 2801 unsigned long timeout;
2802 clock_t expires;
1da177e4 2803 int scope;
6f704992 2804 u32 flags;
1da177e4
LT		 2805
2806 ASSERT_RTNL();
1ab1457c 2807
24ef0da7
TG		 2808 if (plen > 128)
2809 return -EINVAL;
2810
0778769d
NT		 2811 /* check the lifetime */
2812 if (!valid_lft || prefered_lft > valid_lft)
2813 return -EINVAL;
2814
53bd6749
JP		 2815 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2816 return -EINVAL;
2817
af284937
DL		 2818 dev = __dev_get_by_index(net, ifindex);
2819 if (!dev)
1da177e4 2820 return -ENODEV;
1ab1457c 2821
64e724f6
BH		 2822 idev = addrconf_add_dev(dev);
2823 if (IS_ERR(idev))
2824 return PTR_ERR(idev);
1da177e4 2825
93a714d6
MC		 2826 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2827 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2828 true, pfx, ifindex);
2829
2830 if (ret < 0)
2831 return ret;
2832 }
2833
1da177e4
LT		 2834 scope = ipv6_addr_scope(pfx);
2835
4bed72e4
YH		 2836 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2837 if (addrconf_finite_timeout(timeout)) {
2838 expires = jiffies_to_clock_t(timeout * HZ);
2839 valid_lft = timeout;
6f704992 2840 flags = RTF_EXPIRES;
4bed72e4
YH		 2841 } else {
2842 expires = 0;
2843 flags = 0;
2844 ifa_flags |= IFA_F_PERMANENT;
6f704992 2845 }
0778769d 2846
4bed72e4
YH		 2847 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2848 if (addrconf_finite_timeout(timeout)) {
2849 if (timeout == 0)
2850 ifa_flags |= IFA_F_DEPRECATED;
2851 prefered_lft = timeout;
2852 }
0778769d 2853
8a226b2c
JB		 2854 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2855 valid_lft, prefered_lft);
0778769d 2856
1da177e4 2857 if (!IS_ERR(ifp)) {
761aac73
TH		 2858 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2859 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2860 expires, flags);
2861 }
2862
95c385b4
NH		 2863 /*
2864 * Note that section 3.1 of RFC 4429 indicates
2865 * that the Optimistic flag should not be set for
2866 * manually configured addresses
2867 */
cf22f9a2 2868 addrconf_dad_start(ifp);
53bd6749
JP		 2869 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2870 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2871 true, jiffies);
1da177e4 2872 in6_ifa_put(ifp);
c15b1cca 2873 addrconf_verify_rtnl();
1da177e4 2874 return 0;
93a714d6
MC		 2875 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2876 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2877 false, pfx, ifindex);
1da177e4
LT		 2878 }
2879
2880 return PTR_ERR(ifp);
2881}
2882
6046d5b4
HK		 2883static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2884 const struct in6_addr *pfx, unsigned int plen)
1da177e4
LT		 2885{
2886 struct inet6_ifaddr *ifp;
2887 struct inet6_dev *idev;
2888 struct net_device *dev;
1ab1457c 2889
24ef0da7
TG		 2890 if (plen > 128)
2891 return -EINVAL;
2892
af284937
DL		 2893 dev = __dev_get_by_index(net, ifindex);
2894 if (!dev)
1da177e4
LT		 2895 return -ENODEV;
2896
e5d08d71 2897 idev = __in6_dev_get(dev);
63159f29 2898 if (!idev)
1da177e4
LT		 2899 return -ENXIO;
2900
2901 read_lock_bh(&idev->lock);
502a2ffd 2902 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2903 if (ifp->prefix_len == plen &&
2904 ipv6_addr_equal(pfx, &ifp->addr)) {
2905 in6_ifa_hold(ifp);
2906 read_unlock_bh(&idev->lock);
1ab1457c 2907
6046d5b4
HK		 2908 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2909 (ifa_flags & IFA_F_MANAGETEMPADDR))
2910 manage_tempaddrs(idev, ifp, 0, 0, false,
2911 jiffies);
1da177e4 2912 ipv6_del_addr(ifp);
6046d5b4 2913 addrconf_verify_rtnl();
93a714d6
MC		 2914 if (ipv6_addr_is_multicast(pfx)) {
2915 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2916 false, pfx, dev->ifindex);
2917 }
1da177e4
LT		 2918 return 0;
2919 }
2920 }
2921 read_unlock_bh(&idev->lock);
2922 return -EADDRNOTAVAIL;
2923}
2924
2925
af284937 2926int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2927{
2928 struct in6_ifreq ireq;
2929 int err;
1ab1457c 2930
af31f412 2931 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 2932 return -EPERM;
1ab1457c 2933
1da177e4
LT		 2934 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2935 return -EFAULT;
2936
2937 rtnl_lock();
caeaba79 2938 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
af284937
DL		 2939 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2940 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2941 rtnl_unlock();
2942 return err;
2943}
2944
af284937 2945int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2946{
2947 struct in6_ifreq ireq;
2948 int err;
1ab1457c 2949
af31f412 2950 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 2951 return -EPERM;
2952
2953 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2954 return -EFAULT;
2955
2956 rtnl_lock();
6046d5b4 2957 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
af284937 2958 ireq.ifr6_prefixlen);
1da177e4
LT		 2959 rtnl_unlock();
2960 return err;
2961}
2962
b5f348e5
IJ		 2963static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2964 int plen, int scope)
2965{
2966 struct inet6_ifaddr *ifp;
2967
8a226b2c 2968 ifp = ipv6_add_addr(idev, addr, NULL, plen,
07edd741
HFS		 2969 scope, IFA_F_PERMANENT,
2970 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
b5f348e5
IJ		 2971 if (!IS_ERR(ifp)) {
2972 spin_lock_bh(&ifp->lock);
2973 ifp->flags &= ~IFA_F_TENTATIVE;
2974 spin_unlock_bh(&ifp->lock);
764d3be6 2975 rt_genid_bump_ipv6(dev_net(idev->dev));
b5f348e5
IJ		 2976 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2977 in6_ifa_put(ifp);
2978 }
2979}
2980
07a93626 2981#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 2982static void sit_add_v4_addrs(struct inet6_dev *idev)
2983{
1da177e4
LT		 2984 struct in6_addr addr;
2985 struct net_device *dev;
c346dca1 2986 struct net *net = dev_net(idev->dev);
929c9cf3 2987 int scope, plen;
f0e2acfa 2988 u32 pflags = 0;
1da177e4
LT		 2989
2990 ASSERT_RTNL();
2991
2992 memset(&addr, 0, sizeof(struct in6_addr));
2993 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2994
2995 if (idev->dev->flags&IFF_POINTOPOINT) {
2996 addr.s6_addr32[0] = htonl(0xfe800000);
2997 scope = IFA_LINK;
929c9cf3 2998 plen = 64;
1da177e4
LT		 2999 } else {
3000 scope = IPV6_ADDR_COMPATv4;
929c9cf3 3001 plen = 96;
f0e2acfa 3002 pflags |= RTF_NONEXTHOP;
1da177e4
LT		 3003 }
3004
3005 if (addr.s6_addr32[3]) {
929c9cf3 3006 add_addr(idev, &addr, plen, scope);
f0e2acfa 3007 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
1da177e4
LT		 3008 return;
3009 }
3010
6fda7350 3011 for_each_netdev(net, dev) {
8e5e8f30 3012 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 3013 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 3014 struct in_ifaddr *ifa;
1da177e4
LT		 3015
3016 int flag = scope;
3017
3018 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 3019
3020 addr.s6_addr32[3] = ifa->ifa_local;
3021
3022 if (ifa->ifa_scope == RT_SCOPE_LINK)
3023 continue;
3024 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3025 if (idev->dev->flags&IFF_POINTOPOINT)
3026 continue;
3027 flag |= IFA_HOST;
3028 }
1da177e4 3029
b5f348e5 3030 add_addr(idev, &addr, plen, flag);
f0e2acfa
ND		 3031 addrconf_prefix_route(&addr, plen, idev->dev, 0,
3032 pflags);
1da177e4
LT		 3033 }
3034 }
1ab1457c 3035 }
1da177e4 3036}
0be669bb 3037#endif
1da177e4
LT		 3038
3039static void init_loopback(struct net_device *dev)
3040{
3041 struct inet6_dev *idev;
1da177e4
LT		 3042
3043 /* ::1 */
3044
3045 ASSERT_RTNL();
3046
e5d08d71 3047 idev = ipv6_find_idev(dev);
63159f29 3048 if (!idev) {
91df42be 3049 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3050 return;
3051 }
3052
b5f348e5 3053 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 3054}
3055
2ad3ed59
AA		 3056void addrconf_add_linklocal(struct inet6_dev *idev,
3057 const struct in6_addr *addr, u32 flags)
1da177e4 3058{
8e5e8f30 3059 struct inet6_ifaddr *ifp;
64236f3f 3060 u32 addr_flags = flags | IFA_F_PERMANENT;
95c385b4
NH		 3061
3062#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
35e015e1
MC		 3063 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3064 idev->cnf.optimistic_dad) &&
702beb87 3065 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 3066 addr_flags |= IFA_F_OPTIMISTIC;
3067#endif
1da177e4 3068
07edd741
HFS		 3069 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3070 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4 3071 if (!IS_ERR(ifp)) {
46d48046 3072 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 3073 addrconf_dad_start(ifp);
1da177e4
LT		 3074 in6_ifa_put(ifp);
3075 }
3076}
2ad3ed59 3077EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
1da177e4 3078
622c81d5
HFS		 3079static bool ipv6_reserved_interfaceid(struct in6_addr address)
3080{
3081 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3082 return true;
3083
3084 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3085 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3086 return true;
3087
3088 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3089 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3090 return true;
3091
3092 return false;
3093}
3094
3095static int ipv6_generate_stable_address(struct in6_addr *address,
3096 u8 dad_count,
3097 const struct inet6_dev *idev)
3098{
622c81d5
HFS		 3099 static DEFINE_SPINLOCK(lock);
3100 static __u32 digest[SHA_DIGEST_WORDS];
3101 static __u32 workspace[SHA_WORKSPACE_WORDS];
3102
3103 static union {
3104 char __data[SHA_MESSAGE_BYTES];
3105 struct {
3106 struct in6_addr secret;
ff40217e 3107 __be32 prefix[2];
622c81d5
HFS		 3108 unsigned char hwaddr[MAX_ADDR_LEN];
3109 u8 dad_count;
3110 } __packed;
3111 } data;
3112
3113 struct in6_addr secret;
3114 struct in6_addr temp;
3115 struct net *net = dev_net(idev->dev);
3116
3117 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3118
3119 if (idev->cnf.stable_secret.initialized)
3120 secret = idev->cnf.stable_secret.secret;
3121 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3122 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3123 else
3124 return -1;
3125
3126retry:
3127 spin_lock_bh(&lock);
3128
3129 sha_init(digest);
3130 memset(&data, 0, sizeof(data));
3131 memset(workspace, 0, sizeof(workspace));
3132 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
ff40217e
HFS		 3133 data.prefix[0] = address->s6_addr32[0];
3134 data.prefix[1] = address->s6_addr32[1];
622c81d5
HFS		 3135 data.secret = secret;
3136 data.dad_count = dad_count;
3137
3138 sha_transform(digest, data.__data, workspace);
3139
3140 temp = *address;
ff40217e
HFS		 3141 temp.s6_addr32[2] = (__force __be32)digest[0];
3142 temp.s6_addr32[3] = (__force __be32)digest[1];
622c81d5
HFS		 3143
3144 spin_unlock_bh(&lock);
3145
3146 if (ipv6_reserved_interfaceid(temp)) {
3147 dad_count++;
1855b7c3 3148 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
622c81d5
HFS		 3149 return -1;
3150 goto retry;
3151 }
3152
3153 *address = temp;
3154 return 0;
3155}
3156
cc9da6cc
BM		 3157static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3158{
3159 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3160
3161 if (s->initialized)
3162 return;
3163 s = &idev->cnf.stable_secret;
3164 get_random_bytes(&s->secret, sizeof(s->secret));
3165 s->initialized = true;
3166}
3167
bc91b0f0
JP		 3168static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3169{
622c81d5
HFS		 3170 struct in6_addr addr;
3171
ca254490
DA		 3172 /* no link local addresses on L3 master devices */
3173 if (netif_is_l3_master(idev->dev))
3174 return;
3175
622c81d5 3176 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
bc91b0f0 3177
d35a00b8 3178 switch (idev->cnf.addr_gen_mode) {
cc9da6cc
BM		 3179 case IN6_ADDR_GEN_MODE_RANDOM:
3180 ipv6_gen_mode_random_init(idev);
3181 /* fallthrough */
3182 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
622c81d5 3183 if (!ipv6_generate_stable_address(&addr, 0, idev))
64236f3f
HFS		 3184 addrconf_add_linklocal(idev, &addr,
3185 IFA_F_STABLE_PRIVACY);
622c81d5
HFS		 3186 else if (prefix_route)
3187 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3188 break;
3189 case IN6_ADDR_GEN_MODE_EUI64:
bc91b0f0
JP		 3190 /* addrconf_add_linklocal also adds a prefix_route and we
3191 * only need to care about prefix routes if ipv6_generate_eui64
3192 * couldn't generate one.
3193 */
3194 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
64236f3f 3195 addrconf_add_linklocal(idev, &addr, 0);
bc91b0f0
JP		 3196 else if (prefix_route)
3197 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
cc9da6cc
BM		 3198 break;
3199 case IN6_ADDR_GEN_MODE_NONE:
3200 default:
3201 /* will not add any link local address */
3202 break;
bc91b0f0
JP		 3203 }
3204}
3205
1da177e4
LT		 3206static void addrconf_dev_config(struct net_device *dev)
3207{
8e5e8f30 3208 struct inet6_dev *idev;
1da177e4
LT		 3209
3210 ASSERT_RTNL();
3211
74235a25
HX		 3212 if ((dev->type != ARPHRD_ETHER) &&
3213 (dev->type != ARPHRD_FDDI) &&
74235a25 3214 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 3215 (dev->type != ARPHRD_INFINIBAND) &&
e837735e 3216 (dev->type != ARPHRD_IEEE1394) &&
e74bccb8 3217 (dev->type != ARPHRD_TUNNEL6) &&
cc9da6cc 3218 (dev->type != ARPHRD_6LOWPAN) &&
45ce0fd1
FJ		 3219 (dev->type != ARPHRD_IP6GRE) &&
3220 (dev->type != ARPHRD_IPGRE) &&
3221 (dev->type != ARPHRD_TUNNEL) &&
cc9da6cc 3222 (dev->type != ARPHRD_NONE)) {
74235a25
HX		 3223 /* Alas, we support only Ethernet autoconfiguration. */
3224 return;
3225 }
3226
1da177e4 3227 idev = addrconf_add_dev(dev);
64e724f6 3228 if (IS_ERR(idev))
1da177e4
LT		 3229 return;
3230
cc9da6cc
BM		 3231 /* this device type has no EUI support */
3232 if (dev->type == ARPHRD_NONE &&
d35a00b8
FJ		 3233 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3234 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
cc9da6cc 3235
bc91b0f0 3236 addrconf_addr_gen(idev, false);
1da177e4
LT		 3237}
3238
07a93626 3239#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3240static void addrconf_sit_config(struct net_device *dev)
3241{
3242 struct inet6_dev *idev;
3243
3244 ASSERT_RTNL();
3245
1ab1457c
YH		 3246 /*
3247 * Configure the tunnel with one of our IPv4
3248 * addresses... we should configure all of
1da177e4
LT		 3249 * our v4 addrs in the tunnel
3250 */
3251
e5d08d71 3252 idev = ipv6_find_idev(dev);
63159f29 3253 if (!idev) {
91df42be 3254 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 3255 return;
3256 }
3257
c7dc89c0 3258 if (dev->priv_flags & IFF_ISATAP) {
bc91b0f0 3259 addrconf_addr_gen(idev, false);
c7dc89c0
FT		 3260 return;
3261 }
3262
1da177e4
LT		 3263 sit_add_v4_addrs(idev);
3264
62b54dd9 3265 if (dev->flags&IFF_POINTOPOINT)
1da177e4 3266 addrconf_add_mroute(dev);
1da177e4 3267}
0be669bb 3268#endif
1da177e4 3269
07a93626 3270#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3271static void addrconf_gre_config(struct net_device *dev)
3272{
3273 struct inet6_dev *idev;
aee80b54 3274
aee80b54 3275 ASSERT_RTNL();
3276
e5d08d71 3277 idev = ipv6_find_idev(dev);
63159f29 3278 if (!idev) {
91df42be 3279 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 3280 return;
3281 }
3282
bc91b0f0 3283 addrconf_addr_gen(idev, true);
d9e4ce65
HFS		 3284 if (dev->flags & IFF_POINTOPOINT)
3285 addrconf_add_mroute(dev);
aee80b54 3286}
3287#endif
3288
f1705ec1
DA		 3289static int fixup_permanent_addr(struct inet6_dev *idev,
3290 struct inet6_ifaddr *ifp)
3291{
fc882fcf 3292 /* !rt6i_node means the host route was removed from the
8048ced9
DA		 3293 * FIB, for example, if 'lo' device is taken down. In that
3294 * case regenerate the host route.
3295 */
fc882fcf 3296 if (!ifp->rt || !ifp->rt->rt6i_node) {
8048ced9 3297 struct rt6_info *rt, *prev;
f1705ec1
DA		 3298
3299 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
63a4e80b 3300 if (IS_ERR(rt))
f1705ec1
DA		 3301 return PTR_ERR(rt);
3302
8048ced9
DA		 3303 /* ifp->rt can be accessed outside of rtnl */
3304 spin_lock(&ifp->lock);
3305 prev = ifp->rt;
f1705ec1 3306 ifp->rt = rt;
8048ced9
DA		 3307 spin_unlock(&ifp->lock);
3308
3309 ip6_rt_put(prev);
f1705ec1
DA		 3310 }
3311
3312 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3313 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3314 idev->dev, 0, 0);
3315 }
3316
6d717134
DA		 3317 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3318 addrconf_dad_start(ifp);
f1705ec1
DA		 3319
3320 return 0;
3321}
3322
3323static void addrconf_permanent_addr(struct net_device *dev)
3324{
3325 struct inet6_ifaddr *ifp, *tmp;
3326 struct inet6_dev *idev;
3327
3328 idev = __in6_dev_get(dev);
3329 if (!idev)
3330 return;
3331
3332 write_lock_bh(&idev->lock);
3333
3334 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3335 if ((ifp->flags & IFA_F_PERMANENT) &&
3336 fixup_permanent_addr(idev, ifp) < 0) {
3337 write_unlock_bh(&idev->lock);
3338 ipv6_del_addr(ifp);
3339 write_lock_bh(&idev->lock);
3340
3341 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3342 idev->dev->name, &ifp->addr);
3343 }
3344 }
3345
3346 write_unlock_bh(&idev->lock);
3347}
3348
1ab1457c 3349static int addrconf_notify(struct notifier_block *this, unsigned long event,
351638e7 3350 void *ptr)
1da177e4 3351{
351638e7 3352 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4f7f34ea 3353 struct netdev_notifier_changeupper_info *info;
748e2d93 3354 struct inet6_dev *idev = __in6_dev_get(dev);
60abc0be 3355 struct net *net = dev_net(dev);
c5e33bdd 3356 int run_pending = 0;
b217d616 3357 int err;
1da177e4 3358
e21e8467 3359 switch (event) {
45ba9dd2 3360 case NETDEV_REGISTER:
74235a25 3361 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2 3362 idev = ipv6_add_dev(dev);
a317a2f1
WC		 3363 if (IS_ERR(idev))
3364 return notifier_from_errno(PTR_ERR(idev));
45ba9dd2
YH		 3365 }
3366 break;
bcdd553f 3367
b7b0b1d2
AD		 3368 case NETDEV_CHANGEMTU:
3369 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3370 if (dev->mtu < IPV6_MIN_MTU) {
60abc0be 3371 addrconf_ifdown(dev, dev != net->loopback_dev);
b7b0b1d2
AD		 3372 break;
3373 }
3374
3375 if (idev) {
3376 rt6_mtu_change(dev, dev->mtu);
3377 idev->cnf.mtu6 = dev->mtu;
3378 break;
3379 }
3380
3381 /* allocate new idev */
3382 idev = ipv6_add_dev(dev);
3383 if (IS_ERR(idev))
3384 break;
3385
3386 /* device is still not ready */
3387 if (!(idev->if_flags & IF_READY))
3388 break;
3389
3390 run_pending = 1;
3391
3392 /* fall through */
3393
1da177e4 3394 case NETDEV_UP:
3c21edbd 3395 case NETDEV_CHANGE:
c2edacf8
JV		 3396 if (dev->flags & IFF_SLAVE)
3397 break;
3398
3ce62a84
WC		 3399 if (idev && idev->cnf.disable_ipv6)
3400 break;
3401
3c21edbd 3402 if (event == NETDEV_UP) {
38bd10c4
DA		 3403 /* restore routes for permanent addresses */
3404 addrconf_permanent_addr(dev);
3405
1f372c7b 3406 if (!addrconf_link_ready(dev)) {
3c21edbd 3407 /* device is not ready yet. */
f3213831 3408 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 3409 dev->name);
3410 break;
3411 }
99081049 3412
d31c7b8f
EP		 3413 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3414 idev = ipv6_add_dev(dev);
3415
a317a2f1 3416 if (!IS_ERR_OR_NULL(idev)) {
99081049 3417 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 3418 run_pending = 1;
3419 }
b7b0b1d2 3420 } else if (event == NETDEV_CHANGE) {
1f372c7b 3421 if (!addrconf_link_ready(dev)) {
3c21edbd
YH		 3422 /* device is still not ready. */
3423 break;
3424 }
3425
3426 if (idev) {
a088d1d7
LL		 3427 if (idev->if_flags & IF_READY) {
3428 /* device is already configured -
3429 * but resend MLD reports, we might
3430 * have roamed and need to update
3431 * multicast snooping switches
3432 */
3433 ipv6_mc_up(idev);
3c21edbd 3434 break;
a088d1d7 3435 }
3c21edbd
YH		 3436 idev->if_flags |= IF_READY;
3437 }
3438
f3213831
JP		 3439 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3440 dev->name);
3c21edbd 3441
c5e33bdd 3442 run_pending = 1;
3c21edbd
YH		 3443 }
3444
e21e8467 3445 switch (dev->type) {
07a93626 3446#if IS_ENABLED(CONFIG_IPV6_SIT)
1da177e4
LT		 3447 case ARPHRD_SIT:
3448 addrconf_sit_config(dev);
3449 break;
aee80b54 3450#endif
07a93626 3451#if IS_ENABLED(CONFIG_NET_IPGRE)
aee80b54 3452 case ARPHRD_IPGRE:
3453 addrconf_gre_config(dev);
3454 break;
0be669bb 3455#endif
1da177e4
LT		 3456 case ARPHRD_LOOPBACK:
3457 init_loopback(dev);
3458 break;
3459
3460 default:
3461 addrconf_dev_config(dev);
3462 break;
3ff50b79 3463 }
bcdd553f 3464
a317a2f1 3465 if (!IS_ERR_OR_NULL(idev)) {
c5e33bdd
YH		 3466 if (run_pending)
3467 addrconf_dad_run(idev);
3468
bcdd553f
SH		 3469 /*
3470 * If the MTU changed during the interface down,
3471 * when the interface up, the changed MTU must be
3472 * reflected in the idev as well as routers.
1da177e4 3473 */
bcdd553f
SH		 3474 if (idev->cnf.mtu6 != dev->mtu &&
3475 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 3476 rt6_mtu_change(dev, dev->mtu);
3477 idev->cnf.mtu6 = dev->mtu;
3478 }
3479 idev->tstamp = jiffies;
3480 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 3481
3482 /*
3483 * If the changed mtu during down is lower than
3484 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 3485 */
3486 if (dev->mtu < IPV6_MIN_MTU)
60abc0be 3487 addrconf_ifdown(dev, dev != net->loopback_dev);
1da177e4
LT		 3488 }
3489 break;
3490
1da177e4
LT		 3491 case NETDEV_DOWN:
3492 case NETDEV_UNREGISTER:
3493 /*
3494 * Remove all addresses from this interface.
3495 */
3496 addrconf_ifdown(dev, event != NETDEV_DOWN);
3497 break;
3c21edbd 3498
1da177e4 3499 case NETDEV_CHANGENAME:
1da177e4 3500 if (idev) {
5632c515 3501 snmp6_unregister_dev(idev);
408c4768 3502 addrconf_sysctl_unregister(idev);
a317a2f1 3503 err = addrconf_sysctl_register(idev);
b217d616
HX		 3504 if (err)
3505 return notifier_from_errno(err);
a317a2f1
WC		 3506 err = snmp6_register_dev(idev);
3507 if (err) {
3508 addrconf_sysctl_unregister(idev);
3509 return notifier_from_errno(err);
3510 }
5632c515 3511 }
1da177e4 3512 break;
bcdd553f 3513
93d9b7d7
JP		 3514 case NETDEV_PRE_TYPE_CHANGE:
3515 case NETDEV_POST_TYPE_CHANGE:
3ef0952c
AL		 3516 if (idev)
3517 addrconf_type_change(dev, event);
75c78500 3518 break;
4f7f34ea
DA		 3519
3520 case NETDEV_CHANGEUPPER:
3521 info = ptr;
3522
3523 /* flush all routes if dev is linked to or unlinked from
3524 * an L3 master device (e.g., VRF)
3525 */
3526 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3527 addrconf_ifdown(dev, 0);
3ff50b79 3528 }
1da177e4
LT		 3529
3530 return NOTIFY_OK;
3531}
3532
3533/*
3534 * addrconf module should be notified of a device going up
3535 */
3536static struct notifier_block ipv6_dev_notf = {
3537 .notifier_call = addrconf_notify,
242d3a49 3538 .priority = ADDRCONF_NOTIFY_PRIORITY,
1da177e4
LT		 3539};
3540
93d9b7d7 3541static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 3542{
3543 struct inet6_dev *idev;
3544 ASSERT_RTNL();
3545
3546 idev = __in6_dev_get(dev);
3547
93d9b7d7 3548 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 3549 ipv6_mc_remap(idev);
93d9b7d7 3550 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 3551 ipv6_mc_unmap(idev);
3552}
3553
70af921d
DA		 3554static bool addr_is_local(const struct in6_addr *addr)
3555{
3556 return ipv6_addr_type(addr) &
3557 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3558}
3559
1da177e4
LT		 3560static int addrconf_ifdown(struct net_device *dev, int how)
3561{
c346dca1 3562 struct net *net = dev_net(dev);
502a2ffd 3563 struct inet6_dev *idev;
f1705ec1 3564 struct inet6_ifaddr *ifa, *tmp;
f1705ec1
DA		 3565 int _keep_addr;
3566 bool keep_addr;
73a8bd74 3567 int state, i;
1da177e4
LT		 3568
3569 ASSERT_RTNL();
3570
73a8bd74
DM		 3571 rt6_ifdown(net, dev);
3572 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 3573
3574 idev = __in6_dev_get(dev);
63159f29 3575 if (!idev)
1da177e4
LT		 3576 return -ENODEV;
3577
bcdd553f
SH		 3578 /*
3579 * Step 1: remove reference to ipv6 device from parent device.
3580 * Do not dev_put!
1da177e4 3581 */
439e2385 3582 if (how) {
1da177e4 3583 idev->dead = 1;
8814c4b5
YH		 3584
3585 /* protected by rtnl_lock */
a9b3cd7f 3586 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 3587
3588 /* Step 1.5: remove snmp6 entry */
3589 snmp6_unregister_dev(idev);
3590
3591 }
3592
f1705ec1
DA		 3593 /* aggregate the system setting and interface setting */
3594 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3595 if (!_keep_addr)
3596 _keep_addr = idev->cnf.keep_addr_on_down;
3597
3598 /* combine the user config with event to determine if permanent
3599 * addresses are to be removed from address hash table
3600 */
bc561632 3601 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
f1705ec1 3602
73a8bd74
DM		 3603 /* Step 2: clear hash table */
3604 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3605 struct hlist_head *h = &inet6_addr_lst[i];
73a8bd74
DM		 3606
3607 spin_lock_bh(&addrconf_hash_lock);
67ba4152 3608restart:
b67bfe0d 3609 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
73a8bd74 3610 if (ifa->idev == idev) {
c15b1cca 3611 addrconf_del_dad_work(ifa);
f1705ec1
DA		 3612 /* combined flag + permanent flag decide if
3613 * address is retained on a down event
3614 */
3615 if (!keep_addr ||
70af921d
DA		 3616 !(ifa->flags & IFA_F_PERMANENT) ||
3617 addr_is_local(&ifa->addr)) {
f1705ec1
DA		 3618 hlist_del_init_rcu(&ifa->addr_lst);
3619 goto restart;
3620 }
73a8bd74
DM		 3621 }
3622 }
3623 spin_unlock_bh(&addrconf_hash_lock);
3624 }
3625
1da177e4
LT		 3626 write_lock_bh(&idev->lock);
3627
b7b1bfce
HFS		 3628 addrconf_del_rs_timer(idev);
3629
bcdd553f 3630 /* Step 2: clear flags for stateless addrconf */
439e2385 3631 if (!how)
3c21edbd 3632 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 3633
bcdd553f 3634 /* Step 3: clear tempaddr list */
372e6c8f 3635 while (!list_empty(&idev->tempaddr_list)) {
3636 ifa = list_first_entry(&idev->tempaddr_list,
3637 struct inet6_ifaddr, tmp_list);
3638 list_del(&ifa->tmp_list);
1da177e4
LT		 3639 write_unlock_bh(&idev->lock);
3640 spin_lock_bh(&ifa->lock);
3641
3642 if (ifa->ifpub) {
3643 in6_ifa_put(ifa->ifpub);
3644 ifa->ifpub = NULL;
3645 }
3646 spin_unlock_bh(&ifa->lock);
3647 in6_ifa_put(ifa);
3648 write_lock_bh(&idev->lock);
3649 }
8f37ada5 3650
f1705ec1
DA		 3651 /* re-combine the user config with event to determine if permanent
3652 * addresses are to be removed from the interface list
3653 */
bc561632 3654 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
84e8b803 3655
f1705ec1 3656 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
38bd10c4 3657 struct rt6_info *rt = NULL;
a2d6cbb0 3658 bool keep;
38bd10c4 3659
f1705ec1 3660 addrconf_del_dad_work(ifa);
84e8b803 3661
a2d6cbb0
RV		 3662 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3663 !addr_is_local(&ifa->addr);
a2d6cbb0 3664
73a8bd74 3665 write_unlock_bh(&idev->lock);
8e8e676d 3666 spin_lock_bh(&ifa->lock);
f1705ec1 3667
a2d6cbb0 3668 if (keep) {
f1705ec1
DA		 3669 /* set state to skip the notifier below */
3670 state = INET6_IFADDR_STATE_DEAD;
6d717134 3671 ifa->state = INET6_IFADDR_STATE_PREDAD;
f1705ec1
DA		 3672 if (!(ifa->flags & IFA_F_NODAD))
3673 ifa->flags |= IFA_F_TENTATIVE;
38bd10c4
DA		 3674
3675 rt = ifa->rt;
3676 ifa->rt = NULL;
f1705ec1
DA		 3677 } else {
3678 state = ifa->state;
3679 ifa->state = INET6_IFADDR_STATE_DEAD;
f1705ec1
DA		 3680 }
3681
8e8e676d 3682 spin_unlock_bh(&ifa->lock);
9d82ca98 3683
38bd10c4
DA		 3684 if (rt)
3685 ip6_del_rt(rt);
3686
73a8bd74
DM		 3687 if (state != INET6_IFADDR_STATE_DEAD) {
3688 __ipv6_ifa_notify(RTM_DELADDR, ifa);
f88c91dd 3689 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
ea06f717
MM		 3690 } else {
3691 if (idev->cnf.forwarding)
3692 addrconf_leave_anycast(ifa);
3693 addrconf_leave_solict(ifa->idev, &ifa->addr);
27bdb2ab 3694 }
8f37ada5 3695
73a8bd74 3696 write_lock_bh(&idev->lock);
8ef802aa
ED		 3697 if (!keep) {
3698 list_del_rcu(&ifa->if_list);
3699 in6_ifa_put(ifa);
3700 }
73a8bd74 3701 }
8f37ada5 3702
1da177e4
LT		 3703 write_unlock_bh(&idev->lock);
3704
381f4dca
SD		 3705 /* Step 5: Discard anycast and multicast list */
3706 if (how) {
3707 ipv6_ac_destroy_dev(idev);
1da177e4 3708 ipv6_mc_destroy_dev(idev);
381f4dca 3709 } else {
1da177e4 3710 ipv6_mc_down(idev);
381f4dca 3711 }
1da177e4 3712
1da177e4 3713 idev->tstamp = jiffies;
1ab1457c 3714
bcdd553f 3715 /* Last: Shot the device (if unregistered) */
439e2385 3716 if (how) {
408c4768 3717 addrconf_sysctl_unregister(idev);
1da177e4
LT		 3718 neigh_parms_release(&nd_tbl, idev->nd_parms);
3719 neigh_ifdown(&nd_tbl, dev);
3720 in6_dev_put(idev);
3721 }
3722 return 0;
3723}
3724
3725static void addrconf_rs_timer(unsigned long data)
3726{
b7b1bfce 3727 struct inet6_dev *idev = (struct inet6_dev *)data;
caf92bc4 3728 struct net_device *dev = idev->dev;
b7b1bfce 3729 struct in6_addr lladdr;
1da177e4 3730
b7b1bfce 3731 write_lock(&idev->lock);
5b2a1953 3732 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 3733 goto out;
3734
9ba2add3 3735 if (!ipv6_accept_ra(idev))
5b2a1953 3736 goto out;
3737
3738 /* Announcement received after solicitation was sent */
3739 if (idev->if_flags & IF_RA_RCVD)
1da177e4 3740 goto out;
1da177e4 3741
bd11f074 3742 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
caf92bc4
CW		 3743 write_unlock(&idev->lock);
3744 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3745 ndisc_send_rs(dev, &lladdr,
b7b1bfce
HFS		 3746 &in6addr_linklocal_allrouters);
3747 else
caf92bc4 3748 goto put;
1da177e4 3749
caf92bc4 3750 write_lock(&idev->lock);
bd11f074
MŻ		 3751 idev->rs_interval = rfc3315_s14_backoff_update(
3752 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
b7b1bfce
HFS		 3753 /* The wait after the last probe can be shorter */
3754 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3755 idev->cnf.rtr_solicits) ?
3756 idev->cnf.rtr_solicit_delay :
bd11f074 3757 idev->rs_interval);
1da177e4 3758 } else {
1da177e4
LT		 3759 /*
3760 * Note: we do not support deprecated "all on-link"
3761 * assumption any longer.
3762 */
91df42be 3763 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 3764 }
3765
3766out:
b7b1bfce 3767 write_unlock(&idev->lock);
caf92bc4 3768put:
b7b1bfce 3769 in6_dev_put(idev);
1da177e4
LT		 3770}
3771
3772/*
3773 * Duplicate Address Detection
3774 */
3c21edbd
YH		 3775static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3776{
3777 unsigned long rand_num;
3778 struct inet6_dev *idev = ifp->idev;
adc176c5 3779 u64 nonce;
3c21edbd 3780
95c385b4
NH		 3781 if (ifp->flags & IFA_F_OPTIMISTIC)
3782 rand_num = 0;
3783 else
63862b5b 3784 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
95c385b4 3785
adc176c5
EN		 3786 nonce = 0;
3787 if (idev->cnf.enhanced_dad ||
3788 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3789 do
3790 get_random_bytes(&nonce, 6);
3791 while (nonce == 0);
3792 }
3793 ifp->dad_nonce = nonce;
b7b1bfce 3794 ifp->dad_probes = idev->cnf.dad_transmits;
c15b1cca 3795 addrconf_mod_dad_work(ifp, rand_num);
3c21edbd
YH		 3796}
3797
c15b1cca 3798static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
1da177e4
LT		 3799{
3800 struct inet6_dev *idev = ifp->idev;
3801 struct net_device *dev = idev->dev;
764d3be6 3802 bool bump_id, notify = false;
1da177e4
LT		 3803
3804 addrconf_join_solict(dev, &ifp->addr);
3805
63862b5b 3806 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
1da177e4
LT		 3807
3808 read_lock_bh(&idev->lock);
622ccdf1 3809 spin_lock(&ifp->lock);
e9d3e084 3810 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 3811 goto out;
1da177e4
LT		 3812
3813 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
35e015e1 3814 dev_net(dev)->ipv6.devconf_all->accept_dad < 1 ||
1b34be74 3815 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 3816 !(ifp->flags&IFA_F_TENTATIVE) ||
3817 ifp->flags & IFA_F_NODAD) {
764d3be6 3818 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3819 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3820 spin_unlock(&ifp->lock);
1da177e4
LT		 3821 read_unlock_bh(&idev->lock);
3822
764d3be6 3823 addrconf_dad_completed(ifp, bump_id);
1da177e4
LT		 3824 return;
3825 }
3826
6732bade 3827 if (!(idev->if_flags & IF_READY)) {
21809faf 3828 spin_unlock(&ifp->lock);
6732bade 3829 read_unlock_bh(&idev->lock);
3c21edbd 3830 /*
590a9887 3831 * If the device is not ready:
3c21edbd
YH		 3832 * - keep it tentative if it is a permanent address.
3833 * - otherwise, kill it.
3834 */
3835 in6_ifa_hold(ifp);
cc411d0b 3836 addrconf_dad_stop(ifp, 0);
6732bade 3837 return;
3c21edbd 3838 }
95c385b4
NH		 3839
3840 /*
3841 * Optimistic nodes can start receiving
3842 * Frames right away
3843 */
7fd2561e 3844 if (ifp->flags & IFA_F_OPTIMISTIC) {
95c385b4 3845 ip6_ins_rt(ifp->rt);
35e015e1 3846 if (ipv6_use_optimistic_addr(dev_net(dev), idev)) {
7fd2561e
EK		 3847 /* Because optimistic nodes can use this address,
3848 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3849 */
16186a82 3850 notify = true;
7fd2561e
EK		 3851 }
3852 }
95c385b4 3853
6732bade 3854 addrconf_dad_kick(ifp);
1da177e4 3855out:
622ccdf1 3856 spin_unlock(&ifp->lock);
1da177e4 3857 read_unlock_bh(&idev->lock);
16186a82 3858 if (notify)
3859 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1da177e4
LT		 3860}
3861
c15b1cca 3862static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4 3863{
c15b1cca
HFS		 3864 bool begin_dad = false;
3865
8e8e676d 3866 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3867 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3868 ifp->state = INET6_IFADDR_STATE_PREDAD;
3869 begin_dad = true;
3870 }
8e8e676d 3871 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3872
3873 if (begin_dad)
3874 addrconf_mod_dad_work(ifp, 0);
3875}
3876
3877static void addrconf_dad_work(struct work_struct *w)
3878{
3879 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3880 struct inet6_ifaddr,
3881 dad_work);
1da177e4 3882 struct inet6_dev *idev = ifp->idev;
764d3be6 3883 bool bump_id, disable_ipv6 = false;
1da177e4
LT		 3884 struct in6_addr mcaddr;
3885
c15b1cca
HFS		 3886 enum {
3887 DAD_PROCESS,
3888 DAD_BEGIN,
3889 DAD_ABORT,
3890 } action = DAD_PROCESS;
3891
3892 rtnl_lock();
3893
8e8e676d 3894 spin_lock_bh(&ifp->lock);
c15b1cca
HFS		 3895 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3896 action = DAD_BEGIN;
3897 ifp->state = INET6_IFADDR_STATE_DAD;
3898 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3899 action = DAD_ABORT;
3900 ifp->state = INET6_IFADDR_STATE_POSTDAD;
85b51b12 3901
35e015e1
MC		 3902 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
3903 idev->cnf.accept_dad > 1) &&
3904 !idev->cnf.disable_ipv6 &&
85b51b12
MM		 3905 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3906 struct in6_addr addr;
3907
3908 addr.s6_addr32[0] = htonl(0xfe800000);
3909 addr.s6_addr32[1] = 0;
3910
3911 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3912 ipv6_addr_equal(&ifp->addr, &addr)) {
3913 /* DAD failed for link-local based on MAC */
3914 idev->cnf.disable_ipv6 = 1;
3915
3916 pr_info("%s: IPv6 being disabled!\n",
3917 ifp->idev->dev->name);
3918 disable_ipv6 = true;
3919 }
3920 }
c15b1cca 3921 }
8e8e676d 3922 spin_unlock_bh(&ifp->lock);
c15b1cca
HFS		 3923
3924 if (action == DAD_BEGIN) {
3925 addrconf_dad_begin(ifp);
3926 goto out;
3927 } else if (action == DAD_ABORT) {
751eb6b6 3928 in6_ifa_hold(ifp);
c15b1cca 3929 addrconf_dad_stop(ifp, 1);
85b51b12
MM		 3930 if (disable_ipv6)
3931 addrconf_ifdown(idev->dev, 0);
c15b1cca
HFS		 3932 goto out;
3933 }
3934
b7b1bfce 3935 if (!ifp->dad_probes && addrconf_dad_end(ifp))
f2344a13
HX		 3936 goto out;
3937
c15b1cca 3938 write_lock_bh(&idev->lock);
122e4519 3939 if (idev->dead || !(idev->if_flags & IF_READY)) {
c15b1cca 3940 write_unlock_bh(&idev->lock);
1da177e4
LT		 3941 goto out;
3942 }
21809faf 3943
3944 spin_lock(&ifp->lock);
622ccdf1
HX		 3945 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3946 spin_unlock(&ifp->lock);
c15b1cca 3947 write_unlock_bh(&idev->lock);
622ccdf1
HX		 3948 goto out;
3949 }
3950
b7b1bfce 3951 if (ifp->dad_probes == 0) {
1da177e4
LT		 3952 /*
3953 * DAD was successful
3954 */
3955
764d3be6 3956 bump_id = ifp->flags & IFA_F_TENTATIVE;
cc411d0b 3957 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3958 spin_unlock(&ifp->lock);
c15b1cca 3959 write_unlock_bh(&idev->lock);
1da177e4 3960
764d3be6 3961 addrconf_dad_completed(ifp, bump_id);
1da177e4
LT		 3962
3963 goto out;
3964 }
3965
b7b1bfce 3966 ifp->dad_probes--;
c15b1cca
HFS		 3967 addrconf_mod_dad_work(ifp,
3968 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
21809faf 3969 spin_unlock(&ifp->lock);
c15b1cca 3970 write_unlock_bh(&idev->lock);
1da177e4
LT		 3971
3972 /* send a neighbour solicitation for our addr */
1da177e4 3973 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
adc176c5
EN		 3974 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
3975 ifp->dad_nonce);
1da177e4
LT		 3976out:
3977 in6_ifa_put(ifp);
c15b1cca 3978 rtnl_unlock();
1da177e4
LT		 3979}
3980
11ffff75
HFS		 3981/* ifp->idev must be at least read locked */
3982static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3983{
3984 struct inet6_ifaddr *ifpiter;
3985 struct inet6_dev *idev = ifp->idev;
3986
602582ca
HFS		 3987 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3988 if (ifpiter->scope > IFA_LINK)
3989 break;
11ffff75
HFS		 3990 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3991 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3992 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3993 IFA_F_PERMANENT)
3994 return false;
3995 }
3996 return true;
3997}
3998
764d3be6 3999static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id)
1da177e4 4000{
e21e8467 4001 struct net_device *dev = ifp->idev->dev;
b7b1bfce 4002 struct in6_addr lladdr;
b173ee48 4003 bool send_rs, send_mld;
b7b1bfce 4004
c15b1cca 4005 addrconf_del_dad_work(ifp);
1da177e4
LT		 4006
4007 /*
4008 * Configure the address for reception. Now it is valid.
4009 */
4010
4011 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4012
026359bc
TA		 4013 /* If added prefix is link local and we are prepared to process
4014 router advertisements, start sending router solicitations.
1da177e4
LT		 4015 */
4016
1ec047eb 4017 read_lock_bh(&ifp->idev->lock);
11ffff75 4018 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
b173ee48
HFS		 4019 send_rs = send_mld &&
4020 ipv6_accept_ra(ifp->idev) &&
bd11f074 4021 ifp->idev->cnf.rtr_solicits != 0 &&
b173ee48 4022 (dev->flags&IFF_LOOPBACK) == 0;
1ec047eb
HFS		 4023 read_unlock_bh(&ifp->idev->lock);
4024
b173ee48
HFS		 4025 /* While dad is in progress mld report's source address is in6_addrany.
4026 * Resend with proper ll now.
4027 */
4028 if (send_mld)
4029 ipv6_mc_dad_complete(ifp->idev);
4030
1ec047eb 4031 if (send_rs) {
1da177e4
LT		 4032 /*
4033 * If a host as already performed a random delay
4034 * [...] as part of DAD [...] there is no need
4035 * to delay again before sending the first RS
4036 */
1ec047eb 4037 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
b7b1bfce 4038 return;
1ec047eb 4039 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
1da177e4 4040
b7b1bfce
HFS		 4041 write_lock_bh(&ifp->idev->lock);
4042 spin_lock(&ifp->lock);
bd11f074
MŻ		 4043 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4044 ifp->idev->cnf.rtr_solicit_interval);
b7b1bfce 4045 ifp->idev->rs_probes = 1;
1da177e4 4046 ifp->idev->if_flags |= IF_RS_SENT;
bd11f074 4047 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
b7b1bfce
HFS		 4048 spin_unlock(&ifp->lock);
4049 write_unlock_bh(&ifp->idev->lock);
1da177e4 4050 }
764d3be6
PA		 4051
4052 if (bump_id)
4053 rt_genid_bump_ipv6(dev_net(dev));
a11a7f71
MH		 4054
4055 /* Make sure that a new temporary address will be created
4056 * before this temporary address becomes deprecated.
4057 */
4058 if (ifp->flags & IFA_F_TEMPORARY)
4059 addrconf_verify_rtnl();
1da177e4
LT		 4060}
4061
e21e8467
SH		 4062static void addrconf_dad_run(struct inet6_dev *idev)
4063{
c5e33bdd
YH		 4064 struct inet6_ifaddr *ifp;
4065
4066 read_lock_bh(&idev->lock);
502a2ffd 4067 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 4068 spin_lock(&ifp->lock);
f2344a13
HX		 4069 if (ifp->flags & IFA_F_TENTATIVE &&
4070 ifp->state == INET6_IFADDR_STATE_DAD)
4071 addrconf_dad_kick(ifp);
21809faf 4072 spin_unlock(&ifp->lock);
c5e33bdd
YH		 4073 }
4074 read_unlock_bh(&idev->lock);
4075}
4076
1da177e4
LT		 4077#ifdef CONFIG_PROC_FS
4078struct if6_iter_state {
3c40090a 4079 struct seq_net_private p;
1da177e4 4080 int bucket;
1d578303 4081 int offset;
1da177e4
LT		 4082};
4083
1d578303 4084static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 4085{
4086 struct inet6_ifaddr *ifa = NULL;
4087 struct if6_iter_state *state = seq->private;
1218854a 4088 struct net *net = seq_file_net(seq);
1d578303 4089 int p = 0;
1da177e4 4090
1d578303
MM		 4091 /* initial bucket if pos is 0 */
4092 if (pos == 0) {
4093 state->bucket = 0;
4094 state->offset = 0;
4095 }
4096
4097 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
b67bfe0d 4098 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
1d578303 4099 addr_lst) {
9f0d3c27
ED		 4100 if (!net_eq(dev_net(ifa->idev->dev), net))
4101 continue;
1d578303
MM		 4102 /* sync with offset */
4103 if (p < state->offset) {
4104 p++;
4105 continue;
4106 }
4107 state->offset++;
9f0d3c27 4108 return ifa;
1d578303
MM		 4109 }
4110
4111 /* prepare for next bucket */
4112 state->offset = 0;
4113 p = 0;
1da177e4 4114 }
c2e21293 4115 return NULL;
1da177e4
LT		 4116}
4117
c2e21293 4118static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4119 struct inet6_ifaddr *ifa)
1da177e4
LT		 4120{
4121 struct if6_iter_state *state = seq->private;
1218854a 4122 struct net *net = seq_file_net(seq);
1da177e4 4123
b67bfe0d 4124 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
9f0d3c27
ED		 4125 if (!net_eq(dev_net(ifa->idev->dev), net))
4126 continue;
1d578303 4127 state->offset++;
9f0d3c27 4128 return ifa;
1d578303 4129 }
3c40090a 4130
c2e21293 4131 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 4132 state->offset = 0;
b67bfe0d 4133 hlist_for_each_entry_rcu_bh(ifa,
c2e21293 4134 &inet6_addr_lst[state->bucket], addr_lst) {
9f0d3c27
ED		 4135 if (!net_eq(dev_net(ifa->idev->dev), net))
4136 continue;
1d578303 4137 state->offset++;
9f0d3c27 4138 return ifa;
c2e21293 4139 }
1da177e4 4140 }
3c40090a 4141
c2e21293 4142 return NULL;
1da177e4
LT		 4143}
4144
1da177e4 4145static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 4146 __acquires(rcu_bh)
1da177e4 4147{
5c578aed 4148 rcu_read_lock_bh();
1d578303 4149 return if6_get_first(seq, *pos);
1da177e4
LT		 4150}
4151
4152static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4153{
4154 struct inet6_ifaddr *ifa;
4155
4156 ifa = if6_get_next(seq, v);
4157 ++*pos;
4158 return ifa;
4159}
4160
4161static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 4162 __releases(rcu_bh)
1da177e4 4163{
5c578aed 4164 rcu_read_unlock_bh();
1da177e4
LT		 4165}
4166
4167static int if6_seq_show(struct seq_file *seq, void *v)
4168{
4169 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
971a351c 4170 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 4171 &ifp->addr,
1da177e4
LT		 4172 ifp->idev->dev->ifindex,
4173 ifp->prefix_len,
4174 ifp->scope,
971a351c 4175 (u8) ifp->flags,
1da177e4
LT		 4176 ifp->idev->dev->name);
4177 return 0;
4178}
4179
56b3d975 4180static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 4181 .start = if6_seq_start,
4182 .next = if6_seq_next,
4183 .show = if6_seq_show,
4184 .stop = if6_seq_stop,
4185};
4186
4187static int if6_seq_open(struct inode *inode, struct file *file)
4188{
3c40090a
DL		 4189 return seq_open_net(inode, file, &if6_seq_ops,
4190 sizeof(struct if6_iter_state));
1da177e4
LT		 4191}
4192
9a32144e 4193static const struct file_operations if6_fops = {
1da177e4
LT		 4194 .owner = THIS_MODULE,
4195 .open = if6_seq_open,
4196 .read = seq_read,
4197 .llseek = seq_lseek,
3c40090a 4198 .release = seq_release_net,
1da177e4
LT		 4199};
4200
2c8c1e72 4201static int __net_init if6_proc_net_init(struct net *net)
1da177e4 4202{
d4beaa66 4203 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
1da177e4
LT		 4204 return -ENOMEM;
4205 return 0;
4206}
4207
2c8c1e72 4208static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a 4209{
ece31ffd 4210 remove_proc_entry("if_inet6", net->proc_net);
3c40090a
DL		 4211}
4212
4213static struct pernet_operations if6_proc_net_ops = {
67ba4152
IM		 4214 .init = if6_proc_net_init,
4215 .exit = if6_proc_net_exit,
3c40090a
DL		 4216};
4217
4218int __init if6_proc_init(void)
4219{
4220 return register_pernet_subsys(&if6_proc_net_ops);
4221}
4222
1da177e4
LT		 4223void if6_proc_exit(void)
4224{
3c40090a 4225 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 4226}
4227#endif /* CONFIG_PROC_FS */
4228
07a93626 4229#if IS_ENABLED(CONFIG_IPV6_MIP6)
3b9f9a1c 4230/* Check if address is a home address configured on any interface. */
b71d1d42 4231int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 4232{
4233 int ret = 0;
c2e21293 4234 struct inet6_ifaddr *ifp = NULL;
ddbe5032 4235 unsigned int hash = inet6_addr_hash(addr);
c2e21293 4236
5c578aed 4237 rcu_read_lock_bh();
b67bfe0d 4238 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
878628fb 4239 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 4240 continue;
caad295f 4241 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 4242 (ifp->flags & IFA_F_HOMEADDRESS)) {
4243 ret = 1;
4244 break;
4245 }
4246 }
5c578aed 4247 rcu_read_unlock_bh();
3b9f9a1c
NT		 4248 return ret;
4249}
4250#endif
4251
1da177e4
LT		 4252/*
4253 * Periodic address status verification
4254 */
4255
c15b1cca 4256static void addrconf_verify_rtnl(void)
1da177e4 4257{
b2db7564 4258 unsigned long now, next, next_sec, next_sched;
1da177e4 4259 struct inet6_ifaddr *ifp;
1da177e4
LT		 4260 int i;
4261
c15b1cca
HFS		 4262 ASSERT_RTNL();
4263
5c578aed 4264 rcu_read_lock_bh();
1da177e4 4265 now = jiffies;
b2db7564 4266 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4 4267
c15b1cca 4268 cancel_delayed_work(&addr_chk_work);
1da177e4 4269
bcdd553f 4270 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 4271restart:
c15b1cca 4272 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
1da177e4 4273 unsigned long age;
1da177e4 4274
fad8da3e
YA		 4275 /* When setting preferred_lft to a value not zero or
4276 * infinity, while valid_lft is infinity
4277 * IFA_F_PERMANENT has a non-infinity life time.
4278 */
4279 if ((ifp->flags & IFA_F_PERMANENT) &&
4280 (ifp->prefered_lft == INFINITY_LIFE_TIME))
1da177e4
LT		 4281 continue;
4282
4283 spin_lock(&ifp->lock);
b2db7564
YH		 4284 /* We try to batch several events at once. */
4285 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 4286
8f27ebb9
YH		 4287 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4288 age >= ifp->valid_lft) {
1da177e4
LT		 4289 spin_unlock(&ifp->lock);
4290 in6_ifa_hold(ifp);
1da177e4
LT		 4291 ipv6_del_addr(ifp);
4292 goto restart;
8f27ebb9
YH		 4293 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4294 spin_unlock(&ifp->lock);
4295 continue;
1da177e4 4296 } else if (age >= ifp->prefered_lft) {
a1ed0526 4297 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 4298 int deprecate = 0;
4299
4300 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4301 deprecate = 1;
4302 ifp->flags |= IFA_F_DEPRECATED;
4303 }
4304
fad8da3e
YA		 4305 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4306 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
1da177e4
LT		 4307 next = ifp->tstamp + ifp->valid_lft * HZ;
4308
4309 spin_unlock(&ifp->lock);
4310
4311 if (deprecate) {
4312 in6_ifa_hold(ifp);
1da177e4
LT		 4313
4314 ipv6_ifa_notify(0, ifp);
4315 in6_ifa_put(ifp);
4316 goto restart;
4317 }
1da177e4
LT		 4318 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4319 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 4320 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4321 ifp->idev->cnf.dad_transmits *
1f9248e5 4322 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
88949cf4 4323
1da177e4
LT		 4324 if (age >= ifp->prefered_lft - regen_advance) {
4325 struct inet6_ifaddr *ifpub = ifp->ifpub;
4326 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4327 next = ifp->tstamp + ifp->prefered_lft * HZ;
4328 if (!ifp->regen_count && ifpub) {
4329 ifp->regen_count++;
4330 in6_ifa_hold(ifp);
4331 in6_ifa_hold(ifpub);
4332 spin_unlock(&ifp->lock);
5c578aed 4333
291d809b
HY		 4334 spin_lock(&ifpub->lock);
4335 ifpub->regen_count = 0;
4336 spin_unlock(&ifpub->lock);
1da177e4
LT		 4337 ipv6_create_tempaddr(ifpub, ifp);
4338 in6_ifa_put(ifpub);
4339 in6_ifa_put(ifp);
4340 goto restart;
4341 }
4342 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4343 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4344 spin_unlock(&ifp->lock);
1da177e4
LT		 4345 } else {
4346 /* ifp->prefered_lft <= ifp->valid_lft */
4347 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4348 next = ifp->tstamp + ifp->prefered_lft * HZ;
4349 spin_unlock(&ifp->lock);
4350 }
4351 }
1da177e4
LT		 4352 }
4353
b2db7564
YH		 4354 next_sec = round_jiffies_up(next);
4355 next_sched = next;
4356
4357 /* If rounded timeout is accurate enough, accept it. */
4358 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4359 next_sched = next_sec;
4360
4361 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4362 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4363 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4364
ba3542e1 4365 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4366 now, next, next_sec, next_sched);
c15b1cca 4367 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
5c578aed 4368 rcu_read_unlock_bh();
1da177e4
LT		 4369}
4370
c15b1cca
HFS		 4371static void addrconf_verify_work(struct work_struct *w)
4372{
4373 rtnl_lock();
4374 addrconf_verify_rtnl();
4375 rtnl_unlock();
4376}
4377
4378static void addrconf_verify(void)
4379{
4380 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4381}
4382
caeaba79
ND		 4383static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4384 struct in6_addr **peer_pfx)
461d8837
TG		 4385{
4386 struct in6_addr *pfx = NULL;
4387
caeaba79
ND		 4388 *peer_pfx = NULL;
4389
461d8837
TG		 4390 if (addr)
4391 pfx = nla_data(addr);
4392
4393 if (local) {
4394 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
caeaba79
ND		 4395 *peer_pfx = pfx;
4396 pfx = nla_data(local);
461d8837
TG		 4397 }
4398
4399 return pfx;
4400}
4401
ef7c79ed 4402static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 4403 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4404 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4405 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
479840ff 4406 [IFA_FLAGS] = { .len = sizeof(u32) },
461d8837
TG		 4407};
4408
1da177e4 4409static int
c21ef3e3
DA		 4410inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4411 struct netlink_ext_ack *extack)
1da177e4 4412{
3b1e0a65 4413 struct net *net = sock_net(skb->sk);
b933f716
TG		 4414 struct ifaddrmsg *ifm;
4415 struct nlattr *tb[IFA_MAX+1];
caeaba79 4416 struct in6_addr *pfx, *peer_pfx;
6046d5b4 4417 u32 ifa_flags;
b933f716 4418 int err;
1da177e4 4419
fceb6435 4420 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4421 extack);
b933f716
TG		 4422 if (err < 0)
4423 return err;
4424
4425 ifm = nlmsg_data(nlh);
caeaba79 4426 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4427 if (!pfx)
1da177e4
LT		 4428 return -EINVAL;
4429
6046d5b4
HK		 4430 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4431
4432 /* We ignore other flags so far. */
4433 ifa_flags &= IFA_F_MANAGETEMPADDR;
4434
4435 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4436 ifm->ifa_prefixlen);
1da177e4
LT		 4437}
4438
479840ff 4439static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
55ebaef1 4440 u32 prefered_lft, u32 valid_lft)
081bba5b 4441{
6f704992
YH		 4442 u32 flags;
4443 clock_t expires;
4bed72e4 4444 unsigned long timeout;
53bd6749 4445 bool was_managetempaddr;
5b84efec 4446 bool had_prefixroute;
46d48046 4447
c15b1cca
HFS		 4448 ASSERT_RTNL();
4449
081bba5b
NT		 4450 if (!valid_lft || (prefered_lft > valid_lft))
4451 return -EINVAL;
4452
53bd6749
JP		 4453 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4454 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4455 return -EINVAL;
4456
4bed72e4
YH		 4457 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4458 if (addrconf_finite_timeout(timeout)) {
4459 expires = jiffies_to_clock_t(timeout * HZ);
4460 valid_lft = timeout;
6f704992 4461 flags = RTF_EXPIRES;
4bed72e4
YH		 4462 } else {
4463 expires = 0;
4464 flags = 0;
4465 ifa_flags |= IFA_F_PERMANENT;
6f704992 4466 }
081bba5b 4467
4bed72e4
YH		 4468 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4469 if (addrconf_finite_timeout(timeout)) {
4470 if (timeout == 0)
4471 ifa_flags |= IFA_F_DEPRECATED;
4472 prefered_lft = timeout;
4473 }
081bba5b
NT		 4474
4475 spin_lock_bh(&ifp->lock);
53bd6749 4476 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
5b84efec
TH		 4477 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4478 !(ifp->flags & IFA_F_NOPREFIXROUTE);
53bd6749 4479 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
761aac73
TH		 4480 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4481 IFA_F_NOPREFIXROUTE);
53bd6749 4482 ifp->flags |= ifa_flags;
081bba5b
NT		 4483 ifp->tstamp = jiffies;
4484 ifp->valid_lft = valid_lft;
4485 ifp->prefered_lft = prefered_lft;
4486
4487 spin_unlock_bh(&ifp->lock);
4488 if (!(ifp->flags&IFA_F_TENTATIVE))
4489 ipv6_ifa_notify(0, ifp);
081bba5b 4490
761aac73
TH		 4491 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4492 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4493 expires, flags);
5b84efec
TH		 4494 } else if (had_prefixroute) {
4495 enum cleanup_prefix_rt_t action;
4496 unsigned long rt_expires;
4497
4498 write_lock_bh(&ifp->idev->lock);
4499 action = check_cleanup_prefix_route(ifp, &rt_expires);
4500 write_unlock_bh(&ifp->idev->lock);
4501
4502 if (action != CLEANUP_PREFIX_RT_NOP) {
4503 cleanup_prefix_route(ifp, rt_expires,
4504 action == CLEANUP_PREFIX_RT_DEL);
4505 }
761aac73 4506 }
53bd6749
JP		 4507
4508 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4509 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4510 valid_lft = prefered_lft = 0;
4511 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4512 !was_managetempaddr, jiffies);
4513 }
4514
c15b1cca 4515 addrconf_verify_rtnl();
081bba5b
NT		 4516
4517 return 0;
4518}
4519
1da177e4 4520static int
c21ef3e3
DA		 4521inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4522 struct netlink_ext_ack *extack)
1da177e4 4523{
3b1e0a65 4524 struct net *net = sock_net(skb->sk);
461d8837
TG		 4525 struct ifaddrmsg *ifm;
4526 struct nlattr *tb[IFA_MAX+1];
caeaba79 4527 struct in6_addr *pfx, *peer_pfx;
7198f8ce
TG		 4528 struct inet6_ifaddr *ifa;
4529 struct net_device *dev;
55ebaef1 4530 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
479840ff 4531 u32 ifa_flags;
461d8837 4532 int err;
1da177e4 4533
fceb6435 4534 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4535 extack);
461d8837
TG		 4536 if (err < 0)
4537 return err;
4538
4539 ifm = nlmsg_data(nlh);
caeaba79 4540 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
63159f29 4541 if (!pfx)
1da177e4
LT		 4542 return -EINVAL;
4543
461d8837 4544 if (tb[IFA_CACHEINFO]) {
0778769d 4545 struct ifa_cacheinfo *ci;
461d8837
TG		 4546
4547 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 4548 valid_lft = ci->ifa_valid;
461d8837
TG		 4549 preferred_lft = ci->ifa_prefered;
4550 } else {
4551 preferred_lft = INFINITY_LIFE_TIME;
4552 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 4553 }
4554
af284937 4555 dev = __dev_get_by_index(net, ifm->ifa_index);
63159f29 4556 if (!dev)
7198f8ce
TG		 4557 return -ENODEV;
4558
479840ff
JP		 4559 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4560
55ebaef1 4561 /* We ignore other flags so far. */
761aac73 4562 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
93a714d6 4563 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
55ebaef1 4564
1cab3da6 4565 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
63159f29 4566 if (!ifa) {
7198f8ce
TG		 4567 /*
4568 * It would be best to check for !NLM_F_CREATE here but
db9c7c39 4569 * userspace already relies on not having to provide this.
7198f8ce 4570 */
caeaba79 4571 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
af284937
DL		 4572 ifm->ifa_prefixlen, ifa_flags,
4573 preferred_lft, valid_lft);
081bba5b
NT		 4574 }
4575
7198f8ce
TG		 4576 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4577 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4578 err = -EEXIST;
4579 else
55ebaef1 4580 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 4581
4582 in6_ifa_put(ifa);
4583
4584 return err;
1da177e4
LT		 4585}
4586
479840ff 4587static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
101bb229
TG		 4588 u8 scope, int ifindex)
4589{
4590 struct ifaddrmsg *ifm;
4591
4592 ifm = nlmsg_data(nlh);
4593 ifm->ifa_family = AF_INET6;
4594 ifm->ifa_prefixlen = prefixlen;
4595 ifm->ifa_flags = flags;
4596 ifm->ifa_scope = scope;
4597 ifm->ifa_index = ifindex;
4598}
4599
85486af0
TG		 4600static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4601 unsigned long tstamp, u32 preferred, u32 valid)
4602{
4603 struct ifa_cacheinfo ci;
4604
18a31e1e
TG		 4605 ci.cstamp = cstamp_delta(cstamp);
4606 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 4607 ci.ifa_prefered = preferred;
4608 ci.ifa_valid = valid;
4609
4610 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4611}
4612
101bb229
TG		 4613static inline int rt_scope(int ifa_scope)
4614{
4615 if (ifa_scope & IFA_HOST)
4616 return RT_SCOPE_HOST;
4617 else if (ifa_scope & IFA_LINK)
4618 return RT_SCOPE_LINK;
4619 else if (ifa_scope & IFA_SITE)
4620 return RT_SCOPE_SITE;
4621 else
4622 return RT_SCOPE_UNIVERSE;
4623}
4624
0ab6803b
TG		 4625static inline int inet6_ifaddr_msgsize(void)
4626{
339bf98f 4627 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
caeaba79 4628 + nla_total_size(16) /* IFA_LOCAL */
339bf98f 4629 + nla_total_size(16) /* IFA_ADDRESS */
479840ff
JP		 4630 + nla_total_size(sizeof(struct ifa_cacheinfo))
4631 + nla_total_size(4) /* IFA_FLAGS */;
0ab6803b 4632}
c5396a31 4633
1da177e4 4634static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 4635 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4636{
1da177e4 4637 struct nlmsghdr *nlh;
85486af0 4638 u32 preferred, valid;
1da177e4 4639
15e47304 4640 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4641 if (!nlh)
26932566 4642 return -EMSGSIZE;
0ab6803b 4643
101bb229
TG		 4644 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4645 ifa->idev->dev->ifindex);
4646
fad8da3e
YA		 4647 if (!((ifa->flags&IFA_F_PERMANENT) &&
4648 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
85486af0
TG		 4649 preferred = ifa->prefered_lft;
4650 valid = ifa->valid_lft;
4651 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 4652 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 4653 if (preferred > tval)
4654 preferred -= tval;
4655 else
4656 preferred = 0;
f56619fc
BH		 4657 if (valid != INFINITY_LIFE_TIME) {
4658 if (valid > tval)
4659 valid -= tval;
4660 else
4661 valid = 0;
4662 }
1da177e4
LT		 4663 }
4664 } else {
85486af0
TG		 4665 preferred = INFINITY_LIFE_TIME;
4666 valid = INFINITY_LIFE_TIME;
4667 }
4668
7996c799 4669 if (!ipv6_addr_any(&ifa->peer_addr)) {
930345ea
JB		 4670 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4671 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
caeaba79
ND		 4672 goto error;
4673 } else
930345ea 4674 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
caeaba79
ND		 4675 goto error;
4676
4677 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4678 goto error;
1da177e4 4679
479840ff
JP		 4680 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4681 goto error;
4682
053c095a
JB		 4683 nlmsg_end(skb, nlh);
4684 return 0;
caeaba79
ND		 4685
4686error:
4687 nlmsg_cancel(skb, nlh);
4688 return -EMSGSIZE;
1da177e4
LT		 4689}
4690
4691static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 4692 u32 portid, u32 seq, int event, u16 flags)
1da177e4 4693{
1da177e4 4694 struct nlmsghdr *nlh;
101bb229
TG		 4695 u8 scope = RT_SCOPE_UNIVERSE;
4696 int ifindex = ifmca->idev->dev->ifindex;
4697
4698 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4699 scope = RT_SCOPE_SITE;
1da177e4 4700
15e47304 4701 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4702 if (!nlh)
26932566 4703 return -EMSGSIZE;
85486af0 4704
0ab6803b 4705 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4706 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
0ab6803b 4707 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 4708 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4709 nlmsg_cancel(skb, nlh);
4710 return -EMSGSIZE;
4711 }
85486af0 4712
053c095a
JB		 4713 nlmsg_end(skb, nlh);
4714 return 0;
1da177e4
LT		 4715}
4716
4717static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 4718 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4719{
1da177e4 4720 struct nlmsghdr *nlh;
101bb229
TG		 4721 u8 scope = RT_SCOPE_UNIVERSE;
4722 int ifindex = ifaca->aca_idev->dev->ifindex;
4723
4724 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4725 scope = RT_SCOPE_SITE;
1da177e4 4726
15e47304 4727 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
63159f29 4728 if (!nlh)
26932566 4729 return -EMSGSIZE;
85486af0 4730
0ab6803b 4731 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
930345ea 4732 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
0ab6803b 4733 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 4734 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4735 nlmsg_cancel(skb, nlh);
4736 return -EMSGSIZE;
4737 }
1da177e4 4738
053c095a
JB		 4739 nlmsg_end(skb, nlh);
4740 return 0;
1da177e4
LT		 4741}
4742
e21e8467 4743enum addr_type_t {
1da177e4
LT		 4744 UNICAST_ADDR,
4745 MULTICAST_ADDR,
4746 ANYCAST_ADDR,
4747};
4748
234b27c3
ED		 4749/* called with rcu_read_lock() */
4750static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4751 struct netlink_callback *cb, enum addr_type_t type,
4752 int s_ip_idx, int *p_ip_idx)
4753{
234b27c3
ED		 4754 struct ifmcaddr6 *ifmca;
4755 struct ifacaddr6 *ifaca;
4756 int err = 1;
4757 int ip_idx = *p_ip_idx;
4758
4759 read_lock_bh(&idev->lock);
4760 switch (type) {
502a2ffd 4761 case UNICAST_ADDR: {
4762 struct inet6_ifaddr *ifa;
4763
234b27c3 4764 /* unicast address incl. temp addr */
502a2ffd 4765 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4766 if (++ip_idx < s_ip_idx)
234b27c3
ED		 4767 continue;
4768 err = inet6_fill_ifaddr(skb, ifa,
15e47304 4769 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4770 cb->nlh->nlmsg_seq,
4771 RTM_NEWADDR,
4772 NLM_F_MULTI);
053c095a 4773 if (err < 0)
234b27c3 4774 break;
63998ac2 4775 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
234b27c3
ED		 4776 }
4777 break;
502a2ffd 4778 }
234b27c3
ED		 4779 case MULTICAST_ADDR:
4780 /* multicast address */
4781 for (ifmca = idev->mc_list; ifmca;
4782 ifmca = ifmca->next, ip_idx++) {
4783 if (ip_idx < s_ip_idx)
4784 continue;
4785 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 4786 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4787 cb->nlh->nlmsg_seq,
4788 RTM_GETMULTICAST,
4789 NLM_F_MULTI);
053c095a 4790 if (err < 0)
234b27c3
ED		 4791 break;
4792 }
4793 break;
4794 case ANYCAST_ADDR:
4795 /* anycast address */
4796 for (ifaca = idev->ac_list; ifaca;
4797 ifaca = ifaca->aca_next, ip_idx++) {
4798 if (ip_idx < s_ip_idx)
4799 continue;
4800 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 4801 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 4802 cb->nlh->nlmsg_seq,
4803 RTM_GETANYCAST,
4804 NLM_F_MULTI);
053c095a 4805 if (err < 0)
234b27c3
ED		 4806 break;
4807 }
4808 break;
4809 default:
4810 break;
4811 }
4812 read_unlock_bh(&idev->lock);
4813 *p_ip_idx = ip_idx;
4814 return err;
4815}
4816
1da177e4
LT		 4817static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4818 enum addr_type_t type)
4819{
234b27c3
ED		 4820 struct net *net = sock_net(skb->sk);
4821 int h, s_h;
1da177e4
LT		 4822 int idx, ip_idx;
4823 int s_idx, s_ip_idx;
1da177e4 4824 struct net_device *dev;
234b27c3
ED		 4825 struct inet6_dev *idev;
4826 struct hlist_head *head;
1ab1457c 4827
234b27c3
ED		 4828 s_h = cb->args[0];
4829 s_idx = idx = cb->args[1];
4830 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 4831
234b27c3 4832 rcu_read_lock();
63998ac2 4833 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
234b27c3
ED		 4834 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4835 idx = 0;
4836 head = &net->dev_index_head[h];
b67bfe0d 4837 hlist_for_each_entry_rcu(dev, head, index_hlist) {
234b27c3
ED		 4838 if (idx < s_idx)
4839 goto cont;
4b97efdf 4840 if (h > s_h || idx > s_idx)
234b27c3
ED		 4841 s_ip_idx = 0;
4842 ip_idx = 0;
e21e8467
SH		 4843 idev = __in6_dev_get(dev);
4844 if (!idev)
234b27c3
ED		 4845 goto cont;
4846
4847 if (in6_dump_addrs(idev, skb, cb, type,
7b46a644 4848 s_ip_idx, &ip_idx) < 0)
234b27c3 4849 goto done;
7562f876 4850cont:
234b27c3
ED		 4851 idx++;
4852 }
1da177e4 4853 }
234b27c3
ED		 4854done:
4855 rcu_read_unlock();
4856 cb->args[0] = h;
4857 cb->args[1] = idx;
4858 cb->args[2] = ip_idx;
4859
1da177e4
LT		 4860 return skb->len;
4861}
4862
4863static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4864{
4865 enum addr_type_t type = UNICAST_ADDR;
b854272b 4866
1da177e4
LT		 4867 return inet6_dump_addr(skb, cb, type);
4868}
4869
4870static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4871{
4872 enum addr_type_t type = MULTICAST_ADDR;
b854272b 4873
1da177e4
LT		 4874 return inet6_dump_addr(skb, cb, type);
4875}
4876
4877
4878static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4879{
4880 enum addr_type_t type = ANYCAST_ADDR;
b854272b 4881
1da177e4
LT		 4882 return inet6_dump_addr(skb, cb, type);
4883}
4884
c21ef3e3
DA		 4885static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4886 struct netlink_ext_ack *extack)
6c223828 4887{
3b1e0a65 4888 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 4889 struct ifaddrmsg *ifm;
4890 struct nlattr *tb[IFA_MAX+1];
caeaba79 4891 struct in6_addr *addr = NULL, *peer;
6c223828
NT		 4892 struct net_device *dev = NULL;
4893 struct inet6_ifaddr *ifa;
4894 struct sk_buff *skb;
6c223828
NT		 4895 int err;
4896
fceb6435 4897 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
c21ef3e3 4898 extack);
1b29fc2c
TG		 4899 if (err < 0)
4900 goto errout;
4901
caeaba79 4902 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
63159f29 4903 if (!addr) {
1b29fc2c
TG		 4904 err = -EINVAL;
4905 goto errout;
6c223828 4906 }
6c223828 4907
1b29fc2c 4908 ifm = nlmsg_data(nlh);
6c223828 4909 if (ifm->ifa_index)
6fda7350 4910 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 4911
e21e8467
SH		 4912 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4913 if (!ifa) {
1b29fc2c
TG		 4914 err = -EADDRNOTAVAIL;
4915 goto errout;
4916 }
6c223828 4917
e21e8467
SH		 4918 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4919 if (!skb) {
6c223828 4920 err = -ENOBUFS;
1b29fc2c 4921 goto errout_ifa;
6c223828
NT		 4922 }
4923
15e47304 4924 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 4925 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 4926 if (err < 0) {
4927 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4928 WARN_ON(err == -EMSGSIZE);
4929 kfree_skb(skb);
4930 goto errout_ifa;
4931 }
15e47304 4932 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 4933errout_ifa:
6c223828 4934 in6_ifa_put(ifa);
1b29fc2c 4935errout:
6c223828 4936 return err;
6c223828
NT		 4937}
4938
1da177e4
LT		 4939static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4940{
4941 struct sk_buff *skb;
c346dca1 4942 struct net *net = dev_net(ifa->idev->dev);
5d620266 4943 int err = -ENOBUFS;
1da177e4 4944
f784ad3d
MB		 4945 /* Don't send DELADDR notification for TENTATIVE address,
4946 * since NEWADDR notification is sent only after removing
6819a14e 4947 * TENTATIVE flag, if DAD has not failed.
f784ad3d 4948 */
6819a14e
MM		 4949 if (ifa->flags & IFA_F_TENTATIVE && !(ifa->flags & IFA_F_DADFAILED) &&
4950 event == RTM_DELADDR)
f784ad3d
MB		 4951 return;
4952
0ab6803b 4953 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
63159f29 4954 if (!skb)
5d620266
TG		 4955 goto errout;
4956
4957 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 4958 if (err < 0) {
4959 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4960 WARN_ON(err == -EMSGSIZE);
4961 kfree_skb(skb);
4962 goto errout;
4963 }
1ce85fe4
PNA		 4964 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4965 return;
5d620266
TG		 4966errout:
4967 if (err < 0)
6fda7350 4968 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4969}
4970
b6f99a21 4971static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 4972 __s32 *array, int bytes)
4973{
04561c1f
TG		 4974 BUG_ON(bytes < (DEVCONF_MAX * 4));
4975
1da177e4
LT		 4976 memset(array, 0, bytes);
4977 array[DEVCONF_FORWARDING] = cnf->forwarding;
4978 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4979 array[DEVCONF_MTU6] = cnf->mtu6;
4980 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4981 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4982 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4983 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4984 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 4985 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4986 jiffies_to_msecs(cnf->rtr_solicit_interval);
bd11f074
MŻ		 4987 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
4988 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
93908d19
TG		 4989 array[DEVCONF_RTR_SOLICIT_DELAY] =
4990 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4 4991 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
fc4eba58
HFS		 4992 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4993 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4994 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4995 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
1da177e4
LT		 4996 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4997 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4998 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4999 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5000 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
1da177e4 5001 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 5002 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
8013d1d7 5003 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
c4fd30eb 5004 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 5005#ifdef CONFIG_IPV6_ROUTER_PREF
5006 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 5007 array[DEVCONF_RTR_PROBE_INTERVAL] =
5008 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 5009#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b 5010 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
09c884d4
YH		 5011 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5012#endif
930d6ff2 5013#endif
fbea49e1 5014 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 5015 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 5016#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5017 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
7fd2561e 5018 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
95c385b4 5019#endif
7bc570c8
YH		 5020#ifdef CONFIG_IPV6_MROUTE
5021 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5022#endif
778d80be 5023 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 5024 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 5025 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5cb04436 5026 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
b800c3b9 5027 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
d9333196 5028 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
c2943f14 5029 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
35103d11 5030 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
3d1bec99 5031 /* we omit DEVCONF_STABLE_SECRET for now */
3985e8a3 5032 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
abbc3043 5033 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
7a02bf89 5034 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
f1705ec1 5035 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
1ababeba 5036 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
bf355b8d
DL		 5037#ifdef CONFIG_IPV6_SEG6_HMAC
5038 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5039#endif
adc176c5 5040 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
d35a00b8 5041 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
df789fe7 5042 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
1da177e4
LT		 5043}
5044
b382b191
TG		 5045static inline size_t inet6_ifla6_size(void)
5046{
5047 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5048 + nla_total_size(sizeof(struct ifla_cacheinfo))
5049 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5050 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
f53adae4
DB		 5051 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5052 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
b382b191
TG		 5053}
5054
339bf98f
TG		 5055static inline size_t inet6_if_nlmsg_size(void)
5056{
5057 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5058 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5059 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5060 + nla_total_size(4) /* IFLA_MTU */
5061 + nla_total_size(4) /* IFLA_LINK */
0344338b 5062 + nla_total_size(1) /* IFLA_OPERSTATE */
b382b191 5063 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 5064}
c5396a31 5065
be281e55 5066static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
aca05671 5067 int bytes)
7f7d9a6b
HX		 5068{
5069 int i;
aca05671 5070 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
7f7d9a6b
HX		 5071 BUG_ON(pad < 0);
5072
5073 /* Use put_unaligned() because stats may not be aligned for u64. */
aca05671
JH		 5074 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5075 for (i = 1; i < ICMP6_MIB_MAX; i++)
be281e55 5076 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b 5077
aca05671 5078 memset(&stats[ICMP6_MIB_MAX], 0, pad);
7f7d9a6b
HX		 5079}
5080
698365fa 5081static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
a3a77372 5082 int bytes, size_t syncpoff)
4ce3c183 5083{
a3a77372
R		 5084 int i, c;
5085 u64 buff[IPSTATS_MIB_MAX];
5086 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5087
4ce3c183
ED		 5088 BUG_ON(pad < 0);
5089
a3a77372
R		 5090 memset(buff, 0, sizeof(buff));
5091 buff[0] = IPSTATS_MIB_MAX;
4ce3c183 5092
a3a77372
R		 5093 for_each_possible_cpu(c) {
5094 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5095 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5096 }
5097
5098 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5099 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4ce3c183
ED		 5100}
5101
7f7d9a6b
HX		 5102static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5103 int bytes)
5104{
e21e8467 5105 switch (attrtype) {
7f7d9a6b 5106 case IFLA_INET6_STATS:
a3a77372
R		 5107 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5108 offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 5109 break;
5110 case IFLA_INET6_ICMP6STATS:
aca05671 5111 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
7f7d9a6b
HX		 5112 break;
5113 }
5114}
5115
d5566fd7
SV		 5116static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5117 u32 ext_filter_mask)
b382b191
TG		 5118{
5119 struct nlattr *nla;
5120 struct ifla_cacheinfo ci;
5121
c78679e8
DM		 5122 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5123 goto nla_put_failure;
b382b191 5124 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 5125 ci.tstamp = cstamp_delta(idev->tstamp);
5126 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
1f9248e5 5127 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
c78679e8
DM		 5128 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5129 goto nla_put_failure;
b382b191 5130 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
63159f29 5131 if (!nla)
b382b191
TG		 5132 goto nla_put_failure;
5133 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5134
5135 /* XXX - MC not implemented */
5136
d5566fd7
SV		 5137 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5138 return 0;
5139
b382b191 5140 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
63159f29 5141 if (!nla)
b382b191
TG		 5142 goto nla_put_failure;
5143 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5144
5145 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
63159f29 5146 if (!nla)
b382b191
TG		 5147 goto nla_put_failure;
5148 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5149
f53adae4 5150 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
63159f29 5151 if (!nla)
f53adae4 5152 goto nla_put_failure;
bc91b0f0 5153
d35a00b8 5154 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
bc91b0f0
JP		 5155 goto nla_put_failure;
5156
f53adae4
DB		 5157 read_lock_bh(&idev->lock);
5158 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5159 read_unlock_bh(&idev->lock);
5160
b382b191
TG		 5161 return 0;
5162
5163nla_put_failure:
5164 return -EMSGSIZE;
5165}
5166
b1974ed0
AR		 5167static size_t inet6_get_link_af_size(const struct net_device *dev,
5168 u32 ext_filter_mask)
b382b191
TG		 5169{
5170 if (!__in6_dev_get(dev))
5171 return 0;
5172
5173 return inet6_ifla6_size();
5174}
5175
d5566fd7
SV		 5176static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5177 u32 ext_filter_mask)
b382b191
TG		 5178{
5179 struct inet6_dev *idev = __in6_dev_get(dev);
5180
5181 if (!idev)
5182 return -ENODATA;
5183
d5566fd7 5184 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
b382b191
TG		 5185 return -EMSGSIZE;
5186
5187 return 0;
5188}
5189
f53adae4
DB		 5190static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5191{
f53adae4
DB		 5192 struct inet6_ifaddr *ifp;
5193 struct net_device *dev = idev->dev;
47e27d5e 5194 bool clear_token, update_rs = false;
dc848292 5195 struct in6_addr ll_addr;
f53adae4 5196
c15b1cca
HFS		 5197 ASSERT_RTNL();
5198
63159f29 5199 if (!token)
f53adae4 5200 return -EINVAL;
f53adae4
DB		 5201 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5202 return -EINVAL;
f53adae4
DB		 5203 if (!ipv6_accept_ra(idev))
5204 return -EINVAL;
bd11f074 5205 if (idev->cnf.rtr_solicits == 0)
f53adae4
DB		 5206 return -EINVAL;
5207
5208 write_lock_bh(&idev->lock);
5209
5210 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5211 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5212
5213 write_unlock_bh(&idev->lock);
5214
47e27d5e
DB		 5215 clear_token = ipv6_addr_any(token);
5216 if (clear_token)
5217 goto update_lft;
5218
dc848292
HFS		 5219 if (!idev->dead && (idev->if_flags & IF_READY) &&
5220 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5221 IFA_F_OPTIMISTIC)) {
fc403832
DB		 5222 /* If we're not ready, then normal ifup will take care
5223 * of this. Otherwise, we need to request our rs here.
5224 */
5225 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5226 update_rs = true;
5227 }
f53adae4 5228
47e27d5e 5229update_lft:
f53adae4 5230 write_lock_bh(&idev->lock);
fc403832 5231
77ecaace 5232 if (update_rs) {
fc403832 5233 idev->if_flags |= IF_RS_SENT;
bd11f074
MŻ		 5234 idev->rs_interval = rfc3315_s14_backoff_init(
5235 idev->cnf.rtr_solicit_interval);
77ecaace 5236 idev->rs_probes = 1;
bd11f074 5237 addrconf_mod_rs_timer(idev, idev->rs_interval);
77ecaace 5238 }
f53adae4
DB		 5239
5240 /* Well, that's kinda nasty ... */
5241 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5242 spin_lock(&ifp->lock);
617fe29d 5243 if (ifp->tokenized) {
f53adae4
DB		 5244 ifp->valid_lft = 0;
5245 ifp->prefered_lft = 0;
5246 }
5247 spin_unlock(&ifp->lock);
5248 }
5249
5250 write_unlock_bh(&idev->lock);
b2ed64a9 5251 inet6_ifinfo_notify(RTM_NEWLINK, idev);
c15b1cca 5252 addrconf_verify_rtnl();
f53adae4
DB		 5253 return 0;
5254}
5255
11b1f828
DB		 5256static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5257 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5258 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5259};
5260
5261static int inet6_validate_link_af(const struct net_device *dev,
5262 const struct nlattr *nla)
5263{
5264 struct nlattr *tb[IFLA_INET6_MAX + 1];
5265
5266 if (dev && !__in6_dev_get(dev))
5267 return -EAFNOSUPPORT;
5268
fceb6435
JB		 5269 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5270 NULL);
11b1f828
DB		 5271}
5272
d35a00b8
FJ		 5273static int check_addr_gen_mode(int mode)
5274{
5275 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5276 mode != IN6_ADDR_GEN_MODE_NONE &&
5277 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5278 mode != IN6_ADDR_GEN_MODE_RANDOM)
5279 return -EINVAL;
5280 return 1;
5281}
5282
5283static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5284 int mode)
5285{
5286 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5287 !idev->cnf.stable_secret.initialized &&
5288 !net->ipv6.devconf_dflt->stable_secret.initialized)
5289 return -EINVAL;
5290 return 1;
5291}
5292
f53adae4
DB		 5293static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5294{
5295 int err = -EINVAL;
5296 struct inet6_dev *idev = __in6_dev_get(dev);
5297 struct nlattr *tb[IFLA_INET6_MAX + 1];
5298
5299 if (!idev)
5300 return -EAFNOSUPPORT;
5301
fceb6435 5302 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
f53adae4
DB		 5303 BUG();
5304
bc91b0f0 5305 if (tb[IFLA_INET6_TOKEN]) {
f53adae4 5306 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
bc91b0f0
JP		 5307 if (err)
5308 return err;
5309 }
5310
5311 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5312 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5313
d35a00b8
FJ		 5314 if (check_addr_gen_mode(mode) < 0 ||
5315 check_stable_privacy(idev, dev_net(dev), mode) < 0)
bc91b0f0 5316 return -EINVAL;
622c81d5 5317
d35a00b8 5318 idev->cnf.addr_gen_mode = mode;
bc91b0f0
JP		 5319 err = 0;
5320 }
f53adae4
DB		 5321
5322 return err;
5323}
5324
1ab1457c 5325static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5326 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 5327{
04561c1f 5328 struct net_device *dev = idev->dev;
04561c1f
TG		 5329 struct ifinfomsg *hdr;
5330 struct nlmsghdr *nlh;
5331 void *protoinfo;
04561c1f 5332
15e47304 5333 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
63159f29 5334 if (!nlh)
26932566 5335 return -EMSGSIZE;
04561c1f
TG		 5336
5337 hdr = nlmsg_data(nlh);
5338 hdr->ifi_family = AF_INET6;
5339 hdr->__ifi_pad = 0;
5340 hdr->ifi_type = dev->type;
5341 hdr->ifi_index = dev->ifindex;
5342 hdr->ifi_flags = dev_get_flags(dev);
5343 hdr->ifi_change = 0;
5344
c78679e8
DM		 5345 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5346 (dev->addr_len &&
5347 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5348 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
a54acb3a 5349 (dev->ifindex != dev_get_iflink(dev) &&
0344338b
AG		 5350 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5351 nla_put_u8(skb, IFLA_OPERSTATE,
5352 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
c78679e8 5353 goto nla_put_failure;
04561c1f 5354 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
63159f29 5355 if (!protoinfo)
04561c1f 5356 goto nla_put_failure;
1da177e4 5357
d5566fd7 5358 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
bf99f1bd 5359 goto nla_put_failure;
1da177e4 5360
04561c1f 5361 nla_nest_end(skb, protoinfo);
053c095a
JB		 5362 nlmsg_end(skb, nlh);
5363 return 0;
1da177e4 5364
04561c1f 5365nla_put_failure:
26932566
PM		 5366 nlmsg_cancel(skb, nlh);
5367 return -EMSGSIZE;
1da177e4
LT		 5368}
5369
5370static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5371{
3b1e0a65 5372 struct net *net = sock_net(skb->sk);
84d2697d 5373 int h, s_h;
434a8a58 5374 int idx = 0, s_idx;
1da177e4
LT		 5375 struct net_device *dev;
5376 struct inet6_dev *idev;
84d2697d 5377 struct hlist_head *head;
1da177e4 5378
84d2697d
ED		 5379 s_h = cb->args[0];
5380 s_idx = cb->args[1];
5381
5382 rcu_read_lock();
5383 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5384 idx = 0;
5385 head = &net->dev_index_head[h];
b67bfe0d 5386 hlist_for_each_entry_rcu(dev, head, index_hlist) {
84d2697d
ED		 5387 if (idx < s_idx)
5388 goto cont;
5389 idev = __in6_dev_get(dev);
5390 if (!idev)
5391 goto cont;
5392 if (inet6_fill_ifinfo(skb, idev,
15e47304 5393 NETLINK_CB(cb->skb).portid,
84d2697d 5394 cb->nlh->nlmsg_seq,
053c095a 5395 RTM_NEWLINK, NLM_F_MULTI) < 0)
84d2697d 5396 goto out;
7562f876 5397cont:
84d2697d
ED		 5398 idx++;
5399 }
1da177e4 5400 }
84d2697d
ED		 5401out:
5402 rcu_read_unlock();
5403 cb->args[1] = idx;
5404 cb->args[0] = h;
1da177e4
LT		 5405
5406 return skb->len;
5407}
5408
5409void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5410{
5411 struct sk_buff *skb;
c346dca1 5412 struct net *net = dev_net(idev->dev);
8d7a76c9 5413 int err = -ENOBUFS;
1ab1457c 5414
339bf98f 5415 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
63159f29 5416 if (!skb)
8d7a76c9
TG		 5417 goto errout;
5418
5419 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 5420 if (err < 0) {
5421 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5422 WARN_ON(err == -EMSGSIZE);
5423 kfree_skb(skb);
5424 goto errout;
5425 }
5f75a104 5426 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 5427 return;
8d7a76c9
TG		 5428errout:
5429 if (err < 0)
5f75a104 5430 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 5431}
5432
339bf98f
TG		 5433static inline size_t inet6_prefix_nlmsg_size(void)
5434{
5435 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5436 + nla_total_size(sizeof(struct in6_addr))
5437 + nla_total_size(sizeof(struct prefix_cacheinfo));
5438}
c5396a31 5439
1da177e4 5440static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 5441 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 5442 int event, unsigned int flags)
1da177e4 5443{
6051e2f4
TG		 5444 struct prefixmsg *pmsg;
5445 struct nlmsghdr *nlh;
1da177e4
LT		 5446 struct prefix_cacheinfo ci;
5447
15e47304 5448 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
63159f29 5449 if (!nlh)
26932566 5450 return -EMSGSIZE;
6051e2f4
TG		 5451
5452 pmsg = nlmsg_data(nlh);
1da177e4 5453 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 5454 pmsg->prefix_pad1 = 0;
5455 pmsg->prefix_pad2 = 0;
1da177e4
LT		 5456 pmsg->prefix_ifindex = idev->dev->ifindex;
5457 pmsg->prefix_len = pinfo->prefix_len;
5458 pmsg->prefix_type = pinfo->type;
8a47077a 5459 pmsg->prefix_pad3 = 0;
1da177e4
LT		 5460 pmsg->prefix_flags = 0;
5461 if (pinfo->onlink)
5462 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5463 if (pinfo->autoconf)
5464 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5465
c78679e8
DM		 5466 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5467 goto nla_put_failure;
1da177e4
LT		 5468 ci.preferred_time = ntohl(pinfo->prefered);
5469 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 5470 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5471 goto nla_put_failure;
053c095a
JB		 5472 nlmsg_end(skb, nlh);
5473 return 0;
1da177e4 5474
6051e2f4 5475nla_put_failure:
26932566
PM		 5476 nlmsg_cancel(skb, nlh);
5477 return -EMSGSIZE;
1da177e4
LT		 5478}
5479
1ab1457c 5480static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 5481 struct prefix_info *pinfo)
5482{
5483 struct sk_buff *skb;
c346dca1 5484 struct net *net = dev_net(idev->dev);
8c384bfa 5485 int err = -ENOBUFS;
1da177e4 5486
339bf98f 5487 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
63159f29 5488 if (!skb)
8c384bfa
TG		 5489 goto errout;
5490
5491 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 5492 if (err < 0) {
5493 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5494 WARN_ON(err == -EMSGSIZE);
5495 kfree_skb(skb);
5496 goto errout;
5497 }
1ce85fe4
PNA		 5498 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5499 return;
8c384bfa
TG		 5500errout:
5501 if (err < 0)
6fda7350 5502 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 5503}
5504
1da177e4
LT		 5505static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5506{
63998ac2
ND		 5507 struct net *net = dev_net(ifp->idev->dev);
5508
c15b1cca
HFS		 5509 if (event)
5510 ASSERT_RTNL();
5511
1da177e4
LT		 5512 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5513
5514 switch (event) {
5515 case RTM_NEWADDR:
95c385b4
NH		 5516 /*
5517 * If the address was optimistic
5518 * we inserted the route at the start of
5519 * our DAD process, so we don't need
5520 * to do it again
5521 */
4e587ea7 5522 if (!rcu_access_pointer(ifp->rt->rt6i_node))
95c385b4 5523 ip6_ins_rt(ifp->rt);
1da177e4
LT		 5524 if (ifp->idev->cnf.forwarding)
5525 addrconf_join_anycast(ifp);
7996c799 5526 if (!ipv6_addr_any(&ifp->peer_addr))
caeaba79
ND		 5527 addrconf_prefix_route(&ifp->peer_addr, 128,
5528 ifp->idev->dev, 0, 0);
1da177e4
LT		 5529 break;
5530 case RTM_DELADDR:
5531 if (ifp->idev->cnf.forwarding)
5532 addrconf_leave_anycast(ifp);
5533 addrconf_leave_solict(ifp->idev, &ifp->addr);
7996c799 5534 if (!ipv6_addr_any(&ifp->peer_addr)) {
caeaba79 5535 struct rt6_info *rt;
caeaba79 5536
e7478dfc
ND		 5537 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5538 ifp->idev->dev, 0, 0);
8e3d5be7
MKL		 5539 if (rt)
5540 ip6_del_rt(rt);
caeaba79 5541 }
38bd10c4 5542 if (ifp->rt) {
ad65a2f0
WW		 5543 if (dst_hold_safe(&ifp->rt->dst))
5544 ip6_del_rt(ifp->rt);
38bd10c4 5545 }
705f1c86 5546 rt_genid_bump_ipv6(net);
1da177e4
LT		 5547 break;
5548 }
63998ac2 5549 atomic_inc(&net->ipv6.dev_addr_genid);
1da177e4
LT		 5550}
5551
5552static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5553{
8814c4b5 5554 rcu_read_lock_bh();
1da177e4
LT		 5555 if (likely(ifp->idev->dead == 0))
5556 __ipv6_ifa_notify(event, ifp);
8814c4b5 5557 rcu_read_unlock_bh();
1da177e4
LT		 5558}
5559
5560#ifdef CONFIG_SYSCTL
5561
5562static
fe2c6338 5563int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
1da177e4
LT		 5564 void __user *buffer, size_t *lenp, loff_t *ppos)
5565{
5566 int *valp = ctl->data;
5567 int val = *valp;
88af182e 5568 loff_t pos = *ppos;
fe2c6338 5569 struct ctl_table lctl;
1da177e4
LT		 5570 int ret;
5571
013d97e9
FR		 5572 /*
5573 * ctl->data points to idev->cnf.forwarding, we should
5574 * not modify it until we get the rtnl lock.
5575 */
5576 lctl = *ctl;
5577 lctl.data = &val;
5578
5579 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 5580
c8fecf22 5581 if (write)
b325fddb 5582 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 5583 if (ret)
5584 *ppos = pos;
1ab1457c 5585 return ret;
1da177e4
LT		 5586}
5587
77751427
ML		 5588static
5589int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5590 void __user *buffer, size_t *lenp, loff_t *ppos)
5591{
5592 struct inet6_dev *idev = ctl->extra1;
5593 int min_mtu = IPV6_MIN_MTU;
5594 struct ctl_table lctl;
5595
5596 lctl = *ctl;
5597 lctl.extra1 = &min_mtu;
5598 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5599
5600 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5601}
5602
56d417b1
BH		 5603static void dev_disable_change(struct inet6_dev *idev)
5604{
75538c2b
CW		 5605 struct netdev_notifier_info info;
5606
56d417b1
BH		 5607 if (!idev || !idev->dev)
5608 return;
5609
75538c2b 5610 netdev_notifier_info_init(&info, idev->dev);
56d417b1 5611 if (idev->cnf.disable_ipv6)
75538c2b 5612 addrconf_notify(NULL, NETDEV_DOWN, &info);
56d417b1 5613 else
75538c2b 5614 addrconf_notify(NULL, NETDEV_UP, &info);
56d417b1
BH		 5615}
5616
5617static void addrconf_disable_change(struct net *net, __s32 newf)
5618{
5619 struct net_device *dev;
5620 struct inet6_dev *idev;
5621
03e4deff 5622 for_each_netdev(net, dev) {
56d417b1
BH		 5623 idev = __in6_dev_get(dev);
5624 if (idev) {
5625 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5626 idev->cnf.disable_ipv6 = newf;
5627 if (changed)
5628 dev_disable_change(idev);
5629 }
56d417b1 5630 }
56d417b1
BH		 5631}
5632
013d97e9 5633static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 5634{
5635 struct net *net;
013d97e9
FR		 5636 int old;
5637
5638 if (!rtnl_trylock())
5639 return restart_syscall();
56d417b1
BH		 5640
5641 net = (struct net *)table->extra2;
013d97e9
FR		 5642 old = *p;
5643 *p = newf;
56d417b1 5644
013d97e9
FR		 5645 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5646 rtnl_unlock();
56d417b1 5647 return 0;
88af182e 5648 }
56d417b1
BH		 5649
5650 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 5651 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5652 addrconf_disable_change(net, newf);
013d97e9 5653 } else if ((!newf) ^ (!old))
56d417b1
BH		 5654 dev_disable_change((struct inet6_dev *)table->extra1);
5655
5656 rtnl_unlock();
5657 return 0;
5658}
5659
5660static
fe2c6338 5661int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
56d417b1
BH		 5662 void __user *buffer, size_t *lenp, loff_t *ppos)
5663{
5664 int *valp = ctl->data;
5665 int val = *valp;
88af182e 5666 loff_t pos = *ppos;
fe2c6338 5667 struct ctl_table lctl;
56d417b1
BH		 5668 int ret;
5669
013d97e9
FR		 5670 /*
5671 * ctl->data points to idev->cnf.disable_ipv6, we should
5672 * not modify it until we get the rtnl lock.
5673 */
5674 lctl = *ctl;
5675 lctl.data = &val;
5676
5677 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 5678
5679 if (write)
5680 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 5681 if (ret)
5682 *ppos = pos;
56d417b1
BH		 5683 return ret;
5684}
5685
c92d5491 5686static
5687int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5688 void __user *buffer, size_t *lenp, loff_t *ppos)
5689{
5690 int *valp = ctl->data;
5691 int ret;
5692 int old, new;
5693
5694 old = *valp;
5695 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5696 new = *valp;
5697
5698 if (write && old != new) {
5699 struct net *net = ctl->extra2;
5700
5701 if (!rtnl_trylock())
5702 return restart_syscall();
5703
5704 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
85b3daad
DA		 5705 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5706 NETCONFA_PROXY_NEIGH,
c92d5491 5707 NETCONFA_IFINDEX_DEFAULT,
5708 net->ipv6.devconf_dflt);
5709 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
85b3daad
DA		 5710 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5711 NETCONFA_PROXY_NEIGH,
c92d5491 5712 NETCONFA_IFINDEX_ALL,
5713 net->ipv6.devconf_all);
5714 else {
5715 struct inet6_dev *idev = ctl->extra1;
5716
85b3daad
DA		 5717 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5718 NETCONFA_PROXY_NEIGH,
c92d5491 5719 idev->dev->ifindex,
5720 &idev->cnf);
5721 }
5722 rtnl_unlock();
5723 }
5724
5725 return ret;
5726}
5727
d35a00b8
FJ		 5728static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5729 void __user *buffer, size_t *lenp,
5730 loff_t *ppos)
5731{
5732 int ret = 0;
5733 int new_val;
5734 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5735 struct net *net = (struct net *)ctl->extra2;
5736
8c171d6c
FJ		 5737 if (!rtnl_trylock())
5738 return restart_syscall();
5739
d35a00b8
FJ		 5740 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5741
5742 if (write) {
5743 new_val = *((int *)ctl->data);
5744
8c171d6c
FJ		 5745 if (check_addr_gen_mode(new_val) < 0) {
5746 ret = -EINVAL;
5747 goto out;
5748 }
d35a00b8
FJ		 5749
5750 /* request for default */
5751 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5752 ipv6_devconf_dflt.addr_gen_mode = new_val;
5753
5754 /* request for individual net device */
5755 } else {
5756 if (!idev)
8c171d6c 5757 goto out;
d35a00b8 5758
8c171d6c
FJ		 5759 if (check_stable_privacy(idev, net, new_val) < 0) {
5760 ret = -EINVAL;
5761 goto out;
5762 }
d35a00b8
FJ		 5763
5764 if (idev->cnf.addr_gen_mode != new_val) {
5765 idev->cnf.addr_gen_mode = new_val;
d35a00b8 5766 addrconf_dev_config(idev->dev);
d35a00b8
FJ		 5767 }
5768 }
5769 }
5770
8c171d6c
FJ		 5771out:
5772 rtnl_unlock();
5773
d35a00b8
FJ		 5774 return ret;
5775}
5776
3d1bec99
HFS		 5777static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5778 void __user *buffer, size_t *lenp,
5779 loff_t *ppos)
5780{
5781 int err;
5782 struct in6_addr addr;
5783 char str[IPV6_MAX_STRLEN];
5784 struct ctl_table lctl = *ctl;
622c81d5 5785 struct net *net = ctl->extra2;
3d1bec99
HFS		 5786 struct ipv6_stable_secret *secret = ctl->data;
5787
622c81d5
HFS		 5788 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5789 return -EIO;
5790
3d1bec99
HFS		 5791 lctl.maxlen = IPV6_MAX_STRLEN;
5792 lctl.data = str;
5793
5794 if (!rtnl_trylock())
5795 return restart_syscall();
5796
5797 if (!write && !secret->initialized) {
5798 err = -EIO;
5799 goto out;
5800 }
5801
5449a5ca
WC		 5802 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5803 if (err >= sizeof(str)) {
5804 err = -EIO;
5805 goto out;
3d1bec99
HFS		 5806 }
5807
5808 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5809 if (err || !write)
5810 goto out;
5811
5812 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5813 err = -EIO;
5814 goto out;
5815 }
5816
5817 secret->initialized = true;
5818 secret->secret = addr;
5819
622c81d5
HFS		 5820 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5821 struct net_device *dev;
5822
5823 for_each_netdev(net, dev) {
5824 struct inet6_dev *idev = __in6_dev_get(dev);
5825
5826 if (idev) {
d35a00b8 5827 idev->cnf.addr_gen_mode =
622c81d5
HFS		 5828 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5829 }
5830 }
5831 } else {
5832 struct inet6_dev *idev = ctl->extra1;
5833
d35a00b8 5834 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
622c81d5
HFS		 5835 }
5836
3d1bec99
HFS		 5837out:
5838 rtnl_unlock();
5839
5840 return err;
5841}
c92d5491 5842
35103d11
AG		 5843static
5844int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5845 int write,
5846 void __user *buffer,
5847 size_t *lenp,
5848 loff_t *ppos)
5849{
5850 int *valp = ctl->data;
5851 int val = *valp;
5852 loff_t pos = *ppos;
5853 struct ctl_table lctl;
5854 int ret;
5855
5856 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5857 * we should not modify it until we get the rtnl lock.
5858 */
5859 lctl = *ctl;
5860 lctl.data = &val;
5861
5862 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5863
5864 if (write)
5865 ret = addrconf_fixup_linkdown(ctl, valp, val);
5866 if (ret)
5867 *ppos = pos;
5868 return ret;
5869}
5870
df789fe7
DF		 5871static
5872void addrconf_set_nopolicy(struct rt6_info *rt, int action)
5873{
5874 if (rt) {
5875 if (action)
5876 rt->dst.flags |= DST_NOPOLICY;
5877 else
5878 rt->dst.flags &= ~DST_NOPOLICY;
5879 }
5880}
5881
5882static
5883void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
5884{
5885 struct inet6_ifaddr *ifa;
5886
5887 read_lock_bh(&idev->lock);
5888 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5889 spin_lock(&ifa->lock);
5890 if (ifa->rt) {
5891 struct rt6_info *rt = ifa->rt;
df789fe7
DF		 5892 int cpu;
5893
66f5d6ce 5894 rcu_read_lock();
df789fe7
DF		 5895 addrconf_set_nopolicy(ifa->rt, val);
5896 if (rt->rt6i_pcpu) {
5897 for_each_possible_cpu(cpu) {
5898 struct rt6_info **rtp;
5899
5900 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
5901 addrconf_set_nopolicy(*rtp, val);
5902 }
5903 }
66f5d6ce 5904 rcu_read_unlock();
df789fe7
DF		 5905 }
5906 spin_unlock(&ifa->lock);
5907 }
5908 read_unlock_bh(&idev->lock);
5909}
5910
5911static
5912int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
5913{
5914 struct inet6_dev *idev;
5915 struct net *net;
5916
5917 if (!rtnl_trylock())
5918 return restart_syscall();
5919
5920 *valp = val;
5921
5922 net = (struct net *)ctl->extra2;
5923 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
5924 rtnl_unlock();
5925 return 0;
5926 }
5927
5928 if (valp == &net->ipv6.devconf_all->disable_policy) {
5929 struct net_device *dev;
5930
5931 for_each_netdev(net, dev) {
5932 idev = __in6_dev_get(dev);
5933 if (idev)
5934 addrconf_disable_policy_idev(idev, val);
5935 }
5936 } else {
5937 idev = (struct inet6_dev *)ctl->extra1;
5938 addrconf_disable_policy_idev(idev, val);
5939 }
5940
5941 rtnl_unlock();
5942 return 0;
5943}
5944
5945static
5946int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
5947 void __user *buffer, size_t *lenp,
5948 loff_t *ppos)
5949{
5950 int *valp = ctl->data;
5951 int val = *valp;
5952 loff_t pos = *ppos;
5953 struct ctl_table lctl;
5954 int ret;
5955
5956 lctl = *ctl;
5957 lctl.data = &val;
5958 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5959
5960 if (write && (*valp != val))
5961 ret = addrconf_disable_policy(ctl, valp, val);
5962
5963 if (ret)
5964 *ppos = pos;
5965
5966 return ret;
5967}
5968
cb4a4c69 5969static int minus_one = -1;
cb9e684e
MŻ		 5970static const int one = 1;
5971static const int two_five_five = 255;
5972
607ea7cd 5973static const struct ctl_table addrconf_sysctl[] = {
5df1f77f
KK		 5974 {
5975 .procname = "forwarding",
5976 .data = &ipv6_devconf.forwarding,
5977 .maxlen = sizeof(int),
5978 .mode = 0644,
5979 .proc_handler = addrconf_sysctl_forward,
5980 },
5981 {
5982 .procname = "hop_limit",
5983 .data = &ipv6_devconf.hop_limit,
5984 .maxlen = sizeof(int),
5985 .mode = 0644,
cb9e684e
MŻ		 5986 .proc_handler = proc_dointvec_minmax,
5987 .extra1 = (void *)&one,
5988 .extra2 = (void *)&two_five_five,
5df1f77f
KK		 5989 },
5990 {
5991 .procname = "mtu",
5992 .data = &ipv6_devconf.mtu6,
5993 .maxlen = sizeof(int),
5994 .mode = 0644,
5995 .proc_handler = addrconf_sysctl_mtu,
5996 },
5997 {
5998 .procname = "accept_ra",
5999 .data = &ipv6_devconf.accept_ra,
6000 .maxlen = sizeof(int),
6001 .mode = 0644,
6002 .proc_handler = proc_dointvec,
6003 },
6004 {
6005 .procname = "accept_redirects",
6006 .data = &ipv6_devconf.accept_redirects,
6007 .maxlen = sizeof(int),
6008 .mode = 0644,
6009 .proc_handler = proc_dointvec,
6010 },
6011 {
6012 .procname = "autoconf",
6013 .data = &ipv6_devconf.autoconf,
6014 .maxlen = sizeof(int),
6015 .mode = 0644,
6016 .proc_handler = proc_dointvec,
6017 },
6018 {
6019 .procname = "dad_transmits",
6020 .data = &ipv6_devconf.dad_transmits,
6021 .maxlen = sizeof(int),
6022 .mode = 0644,
6023 .proc_handler = proc_dointvec,
6024 },
6025 {
6026 .procname = "router_solicitations",
6027 .data = &ipv6_devconf.rtr_solicits,
6028 .maxlen = sizeof(int),
6029 .mode = 0644,
cb4a4c69
MŻ		 6030 .proc_handler = proc_dointvec_minmax,
6031 .extra1 = &minus_one,
5df1f77f
KK		 6032 },
6033 {
6034 .procname = "router_solicitation_interval",
6035 .data = &ipv6_devconf.rtr_solicit_interval,
6036 .maxlen = sizeof(int),
6037 .mode = 0644,
6038 .proc_handler = proc_dointvec_jiffies,
6039 },
bd11f074
MŻ		 6040 {
6041 .procname = "router_solicitation_max_interval",
6042 .data = &ipv6_devconf.rtr_solicit_max_interval,
6043 .maxlen = sizeof(int),
6044 .mode = 0644,
6045 .proc_handler = proc_dointvec_jiffies,
6046 },
5df1f77f
KK		 6047 {
6048 .procname = "router_solicitation_delay",
6049 .data = &ipv6_devconf.rtr_solicit_delay,
6050 .maxlen = sizeof(int),
6051 .mode = 0644,
6052 .proc_handler = proc_dointvec_jiffies,
6053 },
6054 {
6055 .procname = "force_mld_version",
6056 .data = &ipv6_devconf.force_mld_version,
6057 .maxlen = sizeof(int),
6058 .mode = 0644,
6059 .proc_handler = proc_dointvec,
6060 },
6061 {
6062 .procname = "mldv1_unsolicited_report_interval",
6063 .data =
6064 &ipv6_devconf.mldv1_unsolicited_report_interval,
6065 .maxlen = sizeof(int),
6066 .mode = 0644,
6067 .proc_handler = proc_dointvec_ms_jiffies,
6068 },
6069 {
6070 .procname = "mldv2_unsolicited_report_interval",
6071 .data =
6072 &ipv6_devconf.mldv2_unsolicited_report_interval,
6073 .maxlen = sizeof(int),
6074 .mode = 0644,
6075 .proc_handler = proc_dointvec_ms_jiffies,
6076 },
6077 {
6078 .procname = "use_tempaddr",
6079 .data = &ipv6_devconf.use_tempaddr,
6080 .maxlen = sizeof(int),
6081 .mode = 0644,
6082 .proc_handler = proc_dointvec,
6083 },
6084 {
6085 .procname = "temp_valid_lft",
6086 .data = &ipv6_devconf.temp_valid_lft,
6087 .maxlen = sizeof(int),
6088 .mode = 0644,
6089 .proc_handler = proc_dointvec,
6090 },
6091 {
6092 .procname = "temp_prefered_lft",
6093 .data = &ipv6_devconf.temp_prefered_lft,
6094 .maxlen = sizeof(int),
6095 .mode = 0644,
6096 .proc_handler = proc_dointvec,
6097 },
6098 {
6099 .procname = "regen_max_retry",
6100 .data = &ipv6_devconf.regen_max_retry,
6101 .maxlen = sizeof(int),
6102 .mode = 0644,
6103 .proc_handler = proc_dointvec,
6104 },
6105 {
6106 .procname = "max_desync_factor",
6107 .data = &ipv6_devconf.max_desync_factor,
6108 .maxlen = sizeof(int),
6109 .mode = 0644,
6110 .proc_handler = proc_dointvec,
6111 },
6112 {
6113 .procname = "max_addresses",
6114 .data = &ipv6_devconf.max_addresses,
6115 .maxlen = sizeof(int),
6116 .mode = 0644,
6117 .proc_handler = proc_dointvec,
6118 },
6119 {
6120 .procname = "accept_ra_defrtr",
6121 .data = &ipv6_devconf.accept_ra_defrtr,
6122 .maxlen = sizeof(int),
6123 .mode = 0644,
6124 .proc_handler = proc_dointvec,
6125 },
6126 {
6127 .procname = "accept_ra_min_hop_limit",
6128 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6129 .maxlen = sizeof(int),
6130 .mode = 0644,
6131 .proc_handler = proc_dointvec,
6132 },
6133 {
6134 .procname = "accept_ra_pinfo",
6135 .data = &ipv6_devconf.accept_ra_pinfo,
6136 .maxlen = sizeof(int),
6137 .mode = 0644,
6138 .proc_handler = proc_dointvec,
6139 },
930d6ff2 6140#ifdef CONFIG_IPV6_ROUTER_PREF
5df1f77f
KK		 6141 {
6142 .procname = "accept_ra_rtr_pref",
6143 .data = &ipv6_devconf.accept_ra_rtr_pref,
6144 .maxlen = sizeof(int),
6145 .mode = 0644,
6146 .proc_handler = proc_dointvec,
6147 },
6148 {
6149 .procname = "router_probe_interval",
6150 .data = &ipv6_devconf.rtr_probe_interval,
6151 .maxlen = sizeof(int),
6152 .mode = 0644,
6153 .proc_handler = proc_dointvec_jiffies,
6154 },
fa03ef38 6155#ifdef CONFIG_IPV6_ROUTE_INFO
bbea124b
JS		 6156 {
6157 .procname = "accept_ra_rt_info_min_plen",
6158 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6159 .maxlen = sizeof(int),
6160 .mode = 0644,
6161 .proc_handler = proc_dointvec,
6162 },
5df1f77f
KK		 6163 {
6164 .procname = "accept_ra_rt_info_max_plen",
6165 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6166 .maxlen = sizeof(int),
6167 .mode = 0644,
6168 .proc_handler = proc_dointvec,
6169 },
09c884d4 6170#endif
930d6ff2 6171#endif
5df1f77f
KK		 6172 {
6173 .procname = "proxy_ndp",
6174 .data = &ipv6_devconf.proxy_ndp,
6175 .maxlen = sizeof(int),
6176 .mode = 0644,
6177 .proc_handler = addrconf_sysctl_proxy_ndp,
6178 },
6179 {
6180 .procname = "accept_source_route",
6181 .data = &ipv6_devconf.accept_source_route,
6182 .maxlen = sizeof(int),
6183 .mode = 0644,
6184 .proc_handler = proc_dointvec,
6185 },
95c385b4 6186#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5df1f77f
KK		 6187 {
6188 .procname = "optimistic_dad",
6189 .data = &ipv6_devconf.optimistic_dad,
6190 .maxlen = sizeof(int),
6191 .mode = 0644,
6192 .proc_handler = proc_dointvec,
6193 },
6194 {
6195 .procname = "use_optimistic",
6196 .data = &ipv6_devconf.use_optimistic,
6197 .maxlen = sizeof(int),
6198 .mode = 0644,
6199 .proc_handler = proc_dointvec,
6200 },
7bc570c8
YH		 6201#endif
6202#ifdef CONFIG_IPV6_MROUTE
5df1f77f
KK		 6203 {
6204 .procname = "mc_forwarding",
6205 .data = &ipv6_devconf.mc_forwarding,
6206 .maxlen = sizeof(int),
6207 .mode = 0444,
6208 .proc_handler = proc_dointvec,
6209 },
95c385b4 6210#endif
5df1f77f
KK		 6211 {
6212 .procname = "disable_ipv6",
6213 .data = &ipv6_devconf.disable_ipv6,
6214 .maxlen = sizeof(int),
6215 .mode = 0644,
6216 .proc_handler = addrconf_sysctl_disable,
6217 },
6218 {
6219 .procname = "accept_dad",
6220 .data = &ipv6_devconf.accept_dad,
6221 .maxlen = sizeof(int),
6222 .mode = 0644,
6223 .proc_handler = proc_dointvec,
6224 },
6225 {
6226 .procname = "force_tllao",
6227 .data = &ipv6_devconf.force_tllao,
6228 .maxlen = sizeof(int),
6229 .mode = 0644,
6230 .proc_handler = proc_dointvec
6231 },
6232 {
6233 .procname = "ndisc_notify",
6234 .data = &ipv6_devconf.ndisc_notify,
6235 .maxlen = sizeof(int),
6236 .mode = 0644,
6237 .proc_handler = proc_dointvec
6238 },
6239 {
6240 .procname = "suppress_frag_ndisc",
6241 .data = &ipv6_devconf.suppress_frag_ndisc,
6242 .maxlen = sizeof(int),
6243 .mode = 0644,
6244 .proc_handler = proc_dointvec
6245 },
6246 {
6247 .procname = "accept_ra_from_local",
6248 .data = &ipv6_devconf.accept_ra_from_local,
6249 .maxlen = sizeof(int),
6250 .mode = 0644,
6251 .proc_handler = proc_dointvec,
6252 },
6253 {
6254 .procname = "accept_ra_mtu",
6255 .data = &ipv6_devconf.accept_ra_mtu,
6256 .maxlen = sizeof(int),
6257 .mode = 0644,
6258 .proc_handler = proc_dointvec,
6259 },
6260 {
6261 .procname = "stable_secret",
6262 .data = &ipv6_devconf.stable_secret,
6263 .maxlen = IPV6_MAX_STRLEN,
6264 .mode = 0600,
6265 .proc_handler = addrconf_sysctl_stable_secret,
6266 },
6267 {
6268 .procname = "use_oif_addrs_only",
6269 .data = &ipv6_devconf.use_oif_addrs_only,
6270 .maxlen = sizeof(int),
6271 .mode = 0644,
6272 .proc_handler = proc_dointvec,
6273 },
6274 {
6275 .procname = "ignore_routes_with_linkdown",
6276 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6277 .maxlen = sizeof(int),
6278 .mode = 0644,
6279 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6280 },
6281 {
6282 .procname = "drop_unicast_in_l2_multicast",
6283 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6284 .maxlen = sizeof(int),
6285 .mode = 0644,
6286 .proc_handler = proc_dointvec,
6287 },
6288 {
6289 .procname = "drop_unsolicited_na",
6290 .data = &ipv6_devconf.drop_unsolicited_na,
6291 .maxlen = sizeof(int),
6292 .mode = 0644,
6293 .proc_handler = proc_dointvec,
6294 },
6295 {
6296 .procname = "keep_addr_on_down",
6297 .data = &ipv6_devconf.keep_addr_on_down,
6298 .maxlen = sizeof(int),
6299 .mode = 0644,
6300 .proc_handler = proc_dointvec,
6301
6302 },
1ababeba
DL		 6303 {
6304 .procname = "seg6_enabled",
6305 .data = &ipv6_devconf.seg6_enabled,
6306 .maxlen = sizeof(int),
6307 .mode = 0644,
6308 .proc_handler = proc_dointvec,
6309 },
bf355b8d
DL		 6310#ifdef CONFIG_IPV6_SEG6_HMAC
6311 {
6312 .procname = "seg6_require_hmac",
6313 .data = &ipv6_devconf.seg6_require_hmac,
6314 .maxlen = sizeof(int),
6315 .mode = 0644,
6316 .proc_handler = proc_dointvec,
6317 },
6318#endif
adc176c5
EN		 6319 {
6320 .procname = "enhanced_dad",
6321 .data = &ipv6_devconf.enhanced_dad,
6322 .maxlen = sizeof(int),
6323 .mode = 0644,
6324 .proc_handler = proc_dointvec,
6325 },
d35a00b8
FJ		 6326 {
6327 .procname = "addr_gen_mode",
6328 .data = &ipv6_devconf.addr_gen_mode,
6329 .maxlen = sizeof(int),
6330 .mode = 0644,
6331 .proc_handler = addrconf_sysctl_addr_gen_mode,
6332 },
df789fe7
DF		 6333 {
6334 .procname = "disable_policy",
6335 .data = &ipv6_devconf.disable_policy,
6336 .maxlen = sizeof(int),
6337 .mode = 0644,
6338 .proc_handler = addrconf_sysctl_disable_policy,
6339 },
5df1f77f
KK		 6340 {
6341 /* sentinel */
6342 }
1da177e4
LT		 6343};
6344
bff16c2f 6345static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 6346 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4 6347{
29c994e3 6348 int i, ifindex;
607ea7cd 6349 struct ctl_table *table;
6105e293 6350 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 6351
607ea7cd
KK		 6352 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6353 if (!table)
f68635e6
PE		 6354 goto out;
6355
607ea7cd
KK		 6356 for (i = 0; table[i].data; i++) {
6357 table[i].data += (char *)p - (char *)&ipv6_devconf;
cb9e684e
MŻ		 6358 /* If one of these is already set, then it is not safe to
6359 * overwrite either of them: this makes proc_dointvec_minmax
6360 * usable.
6361 */
6362 if (!table[i].extra1 && !table[i].extra2) {
6363 table[i].extra1 = idev; /* embedded; no ref */
6364 table[i].extra2 = net;
6365 }
1da177e4 6366 }
1da177e4 6367
6105e293 6368 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 6369
607ea7cd
KK		 6370 p->sysctl_header = register_net_sysctl(net, path, table);
6371 if (!p->sysctl_header)
6105e293 6372 goto free;
f68635e6 6373
29c994e3
ND		 6374 if (!strcmp(dev_name, "all"))
6375 ifindex = NETCONFA_IFINDEX_ALL;
6376 else if (!strcmp(dev_name, "default"))
6377 ifindex = NETCONFA_IFINDEX_DEFAULT;
6378 else
6379 ifindex = idev->dev->ifindex;
85b3daad
DA		 6380 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6381 ifindex, p);
95897312 6382 return 0;
1da177e4 6383
f68635e6 6384free:
607ea7cd 6385 kfree(table);
f68635e6 6386out:
95897312 6387 return -ENOBUFS;
1da177e4
LT		 6388}
6389
23452170
DA		 6390static void __addrconf_sysctl_unregister(struct net *net,
6391 struct ipv6_devconf *p, int ifindex)
408c4768 6392{
607ea7cd 6393 struct ctl_table *table;
408c4768 6394
607ea7cd 6395 if (!p->sysctl_header)
408c4768
PE		 6396 return;
6397
607ea7cd
KK		 6398 table = p->sysctl_header->ctl_table_arg;
6399 unregister_net_sysctl_table(p->sysctl_header);
6400 p->sysctl_header = NULL;
6401 kfree(table);
23452170
DA		 6402
6403 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
408c4768
PE		 6404}
6405
a317a2f1 6406static int addrconf_sysctl_register(struct inet6_dev *idev)
f52295a9 6407{
a317a2f1
WC		 6408 int err;
6409
6410 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6411 return -EINVAL;
6412
6413 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6414 &ndisc_ifinfo_sysctl_change);
6415 if (err)
6416 return err;
6417 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6418 idev, &idev->cnf);
6419 if (err)
6420 neigh_sysctl_unregister(idev->nd_parms);
6421
6422 return err;
f52295a9
PE		 6423}
6424
408c4768 6425static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 6426{
23452170
DA		 6427 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6428 idev->dev->ifindex);
408c4768 6429 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 6430}
6431
6432
6433#endif
6434
2c8c1e72 6435static int __net_init addrconf_init_net(struct net *net)
e0da5a48 6436{
a79ca223 6437 int err = -ENOMEM;
e0da5a48
PE		 6438 struct ipv6_devconf *all, *dflt;
6439
a79ca223 6440 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
63159f29 6441 if (!all)
a79ca223 6442 goto err_alloc_all;
e0da5a48 6443
a79ca223 6444 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
63159f29 6445 if (!dflt)
a79ca223 6446 goto err_alloc_dflt;
e0da5a48 6447
a79ca223
HZ		 6448 /* these will be inherited by all namespaces */
6449 dflt->autoconf = ipv6_defaults.autoconf;
6450 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48 6451
3d1bec99
HFS		 6452 dflt->stable_secret.initialized = false;
6453 all->stable_secret.initialized = false;
6454
e0da5a48
PE		 6455 net->ipv6.devconf_all = all;
6456 net->ipv6.devconf_dflt = dflt;
6457
6458#ifdef CONFIG_SYSCTL
f8572d8f 6459 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 6460 if (err < 0)
6461 goto err_reg_all;
6462
f8572d8f 6463 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 6464 if (err < 0)
6465 goto err_reg_dflt;
6466#endif
6467 return 0;
6468
6469#ifdef CONFIG_SYSCTL
6470err_reg_dflt:
23452170 6471 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
e0da5a48
PE		 6472err_reg_all:
6473 kfree(dflt);
6474#endif
6475err_alloc_dflt:
6476 kfree(all);
6477err_alloc_all:
6478 return err;
6479}
6480
2c8c1e72 6481static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 6482{
6483#ifdef CONFIG_SYSCTL
23452170
DA		 6484 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6485 NETCONFA_IFINDEX_DEFAULT);
6486 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6487 NETCONFA_IFINDEX_ALL);
e0da5a48 6488#endif
73cf0e92 6489 kfree(net->ipv6.devconf_dflt);
6490 kfree(net->ipv6.devconf_all);
e0da5a48
PE		 6491}
6492
6493static struct pernet_operations addrconf_ops = {
6494 .init = addrconf_init_net,
6495 .exit = addrconf_exit_net,
6496};
6497
207895fd 6498static struct rtnl_af_ops inet6_ops __read_mostly = {
b382b191
TG		 6499 .family = AF_INET6,
6500 .fill_link_af = inet6_fill_link_af,
6501 .get_link_af_size = inet6_get_link_af_size,
11b1f828 6502 .validate_link_af = inet6_validate_link_af,
f53adae4 6503 .set_link_af = inet6_set_link_af,
b382b191
TG		 6504};
6505
1da177e4
LT		 6506/*
6507 * Init / cleanup code
6508 */
6509
6510int __init addrconf_init(void)
6511{
a317a2f1 6512 struct inet6_dev *idev;
c2e21293 6513 int i, err;
2a8cc6c8 6514
e21e8467
SH		 6515 err = ipv6_addr_label_init();
6516 if (err < 0) {
f3213831
JP		 6517 pr_crit("%s: cannot initialize default policy table: %d\n",
6518 __func__, err);
2cc6d2bf 6519 goto out;
2a8cc6c8 6520 }
1da177e4 6521
2cc6d2bf
NH		 6522 err = register_pernet_subsys(&addrconf_ops);
6523 if (err < 0)
6524 goto out_addrlabel;
e0da5a48 6525
c15b1cca
HFS		 6526 addrconf_wq = create_workqueue("ipv6_addrconf");
6527 if (!addrconf_wq) {
6528 err = -ENOMEM;
6529 goto out_nowq;
6530 }
6531
1da177e4
LT		 6532 /* The addrconf netdev notifier requires that loopback_dev
6533 * has it's ipv6 private information allocated and setup
6534 * before it can bring up and give link-local addresses
6535 * to other devices which are up.
6536 *
6537 * Unfortunately, loopback_dev is not necessarily the first
6538 * entry in the global dev_base list of net devices. In fact,
6539 * it is likely to be the very last entry on that list.
6540 * So this causes the notifier registry below to try and
6541 * give link-local addresses to all devices besides loopback_dev
6542 * first, then loopback_dev, which cases all the non-loopback_dev
6543 * devices to fail to get a link-local address.
6544 *
6545 * So, as a temporary fix, allocate the ipv6 structure for
6546 * loopback_dev first by hand.
6547 * Longer term, all of the dependencies ipv6 has upon the loopback
6548 * device and it being up should be removed.
6549 */
6550 rtnl_lock();
a317a2f1 6551 idev = ipv6_add_dev(init_net.loopback_dev);
1da177e4 6552 rtnl_unlock();
a317a2f1
WC		 6553 if (IS_ERR(idev)) {
6554 err = PTR_ERR(idev);
e0da5a48 6555 goto errlo;
a317a2f1 6556 }
1da177e4 6557
2f460933
WC		 6558 ip6_route_init_special_entries();
6559
c2e21293 6560 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6561 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6562
1da177e4
LT		 6563 register_netdevice_notifier(&ipv6_dev_notf);
6564
c15b1cca 6565 addrconf_verify();
c127ea2c 6566
3678a9d8 6567 rtnl_af_register(&inet6_ops);
b382b191 6568
c7ac8679 6569 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
b97bac64 6570 0);
c127ea2c
TG		 6571 if (err < 0)
6572 goto errout;
6573
6574 /* Only the first call to __rtnl_register can fail */
b97bac64
FW		 6575 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, 0);
6576 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, 0);
c7ac8679 6577 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
b97bac64 6578 inet6_dump_ifaddr, 0);
c7ac8679 6579 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
b97bac64 6580 inet6_dump_ifmcaddr, 0);
c7ac8679 6581 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
b97bac64 6582 inet6_dump_ifacaddr, 0);
76f8f6cb 6583 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
b97bac64 6584 inet6_netconf_dump_devconf, 0);
c127ea2c 6585
2a8cc6c8
YH		 6586 ipv6_addr_label_rtnl_register();
6587
1da177e4 6588 return 0;
c127ea2c 6589errout:
b382b191 6590 rtnl_af_unregister(&inet6_ops);
c127ea2c 6591 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6592errlo:
c15b1cca
HFS		 6593 destroy_workqueue(addrconf_wq);
6594out_nowq:
e0da5a48 6595 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 6596out_addrlabel:
6597 ipv6_addr_label_cleanup();
6598out:
c127ea2c 6599 return err;
1da177e4
LT		 6600}
6601
09f7709f 6602void addrconf_cleanup(void)
1da177e4 6603{
176c39af 6604 struct net_device *dev;
1da177e4
LT		 6605 int i;
6606
6607 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 6608 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 6609 ipv6_addr_label_cleanup();
1da177e4 6610
5c45121d 6611 rtnl_af_unregister(&inet6_ops);
1da177e4 6612
5c45121d 6613 rtnl_lock();
b382b191 6614
176c39af
DL		 6615 /* clean dev list */
6616 for_each_netdev(&init_net, dev) {
6617 if (__in6_dev_get(dev) == NULL)
6618 continue;
6619 addrconf_ifdown(dev, 1);
6620 }
6621 addrconf_ifdown(init_net.loopback_dev, 2);
6622
1da177e4
LT		 6623 /*
6624 * Check hash table.
6625 */
5c578aed 6626 spin_lock_bh(&addrconf_hash_lock);
c2e21293 6627 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6628 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 6629 spin_unlock_bh(&addrconf_hash_lock);
c15b1cca 6630 cancel_delayed_work(&addr_chk_work);
1da177e4 6631 rtnl_unlock();
c15b1cca
HFS		 6632
6633 destroy_workqueue(addrconf_wq);
1da177e4 6634}
Linux 6.x block layer and io_uring tree(s)